Patent Publication Number: US-2021189746-A1

Title: Binding machine

Description:
TECHNICAL FIELD 
     The present invention relates to a binding machine for binding a binding object such as reinforcing bars with a wire. 
     BACKGROUND ART 
     In the related art, there has been suggested a binding machine called a reinforcing bar binding machine which winds a wire around two or more reinforcing bars and twists the wound wire to bind the two or more reinforcing bars. 
     A reinforcing bar binding machine according to the related art has a configuration in which wires are fed and wound around a reinforcing bar, and then are twisted and bound (for example, see Patent Literature 1). In order to reduce the amount of wire used for such a reinforcing bar binding machine, a reinforcing bar binding machine has been proposed in which wires are fed in a forward direction and wound around the reinforcing bar, and then the wires are fed (pulled back) in a backward direction and wound around the reinforcing bar in close contact with the reinforcing bar (for example, see Patent Literature 2). 
     Even in any binding machine, since a feed path is required to wind the wires around the reinforcing bar, a pair of guides are provided along the feed path of the wires. 
     CITATION LIST 
     Patent Literature 
     [Patent Literature 1]: Japanese Patent No. 5182212 
     [Patent Literature 2]: Japanese Patent No. 4747454 
     SUMMARY 
     Technical Problem 
     In the related arts, the pair of guides constituting the feed path for winding the wires around a binding object are fixed to a main body of the binding machine, so as to restrict radial expansion of a loop of the wires wound around the binding object. However, when each of the guides is fixed, a binding operation is completed, and the binding object is caught by the guide in an operation of pulling out the guide of the binding machine from the binding object, resulting in deteriorating workability. 
     On the other hand, a technique has been proposed in which one of the pair of guides is rotatable so that the binding object is not caught by the guide during the operation of pulling out the guide of the binding machine from the binding object. However, since the entire of one guide moves in the radial direction of the loop of the wire formed in the loop, it is not possible to sufficiently suppress the radial expansion of the looped wires. 
     The present invention has been made to solve the problem, and an object thereof is to provide a binding machine including a guide capable of suppressing radial expansion of a loop of wires formed in a loop and having excellent workability. 
     Solution to Problem 
     In order to solve the problem described above, the present invention is to provide a binding machine includes: a feeding unit having a guide unit capable of winding wires around a binding object; and a binding unit that twists the wires wound by the feeding unit, wherein the guide unit includes: a first guide unit that curls the wires fed by the feeding unit and a second guide unit that guides the wires fed from the first guide unit, and the second guide unit includes a third guide unit which restricts a position in a radial direction of a loop formed by the wires wound by the feeding unit and a fourth guide unit which restricts a position in a radial direction of a loop formed by the wires wound by the feeding unit. 
     According to the present invention, in the operation of winding the wires around the binding object, the wires fed from the first guide unit can be bound by the binding unit in such a manner that the wires are guided to the third guide unit in a state where the position in the radial direction of the loop of the wires is restricted by the fourth guide unit of the second guide unit and the position in the radial direction of the loop of the wires is restricted by the third guide unit. 
     Advantageous Effects of the Invention 
     According to the present invention, the third guide unit for regulating the radial position of wire loop is fixed or movable, so that the radial expansion of the wire loop is suppressed. Further, the fourth guide unit for regulating the radial position of the wire loop is movable, so that workability is improved in the operation of pulling out the binding machine from the binding object bound with the wires. 
    
    
     
       [BRIEF DESCRIPTION OF THE DRAWINGS] 
         FIG. 1  is a view of an example of an overall configuration of a reinforcing bar binding machine of the present embodiment as viewed from the side. 
         FIG. 2  is a front view illustrating an example of the overall configuration of the reinforcing bar binding machine of the present embodiment as viewed from the front. 
         FIG. 3  is a view illustrating an example of a feed gear according to the present embodiment. 
         FIG. 4A  is a view illustrating an example of a parallel guide of the present embodiment. 
         FIG. 4B  is a view illustrating an example of a parallel guide of the present embodiment. 
         FIG. 4C  is a view illustrating an example of a parallel guide of the present embodiment. 
         FIG. 4D  is a view illustrating an example of parallel wires. 
         FIG. 4E  is a view illustrating an example of intersecting twisted wires. 
         FIG. 5  is a view illustrating an example of a guide groove of the present embodiment. 
         FIG. 6  is a view illustrating an example of a second guide unit of the present embodiment. 
         FIG. 7A  is a view illustrating an example of a second guide unit of the present embodiment. 
         FIG. 7B  is a view illustrating an example of a second guide unit of the present embodiment. 
         FIG. 8A  is a view illustrating an example of a second guide unit of the present embodiment 
         FIG. 8B  is a view illustrating an example of a second guide unit of the present embodiment. 
         FIG. 9A  is a view illustrating main parts of a gripping unit according to the present embodiment. 
         FIG. 9B  is a view illustrating main parts of a gripping unit according to the present embodiment. 
         FIG. 10  is an explanatory view of an operation of the reinforcing bar binding machine of the present embodiment. 
         FIG. 11  is an explanatory view of an operation of the reinforcing bar binding machine of the present embodiment. 
         FIG. 12  is an explanatory view of an operation of the reinforcing bar binding machine of the present embodiment. 
         FIG. 13  is an explanatory view of an operation of the reinforcing bar binding machine of the present embodiment. 
         FIG. 14  is an explanatory view of an operation of the reinforcing bar binding machine of the present embodiment. 
         FIG. 15  is an explanatory view of an operation of the reinforcing bar binding machine of the present embodiment. 
         FIG. 16  is an explanatory view of an operation of the reinforcing bar binding machine of the present embodiment. 
         FIG. 17  is an explanatory view of an operation of the reinforcing bar binding machine of the present embodiment. 
         FIG. 18A  is an explanatory view of an operation of winding a wire around a reinforcing bar. 
         FIG. 18B  is an explanatory view of an operation of winding a wire around a reinforcing bar. 
         FIG. 18C  is an explanatory view of an operation of winding a wire around a reinforcing bar. 
         FIG. 19A  is an explanatory view of an operation of forming a loop with a wire by a curl guide unit. 
         FIG. 19B  is an explanatory view of an operation for forming a loop with a wire by a curl guide unit. 
         FIG. 20A  is an explanatory view of an operation of bending a wire. 
         FIG. 20B  is an explanatory view of an operation of bending a wire. 
         FIG. 20C  is an explanatory view of an operation of bending a wire. 
         FIG. 21A  is an operational effect example of the reinforcing bar binding machine of the present embodiment. 
         FIG. 21B  is an operational effect example of the reinforcing bar binding machine of the present embodiment. 
         FIG. 22A  is an operational effect example of the reinforcing bar binding machine of the present embodiment. 
         FIG. 22B  is an example of operation and problem of the reinforcing bar binding machine according to the related art. 
         FIG. 23A  is an operational effect example of the reinforcing bar binding machine of the present embodiment 
         FIG. 23B  is an example of operation and problem of the reinforcing bar binding machine according to the related art. 
         FIG. 24A  is an operational effect example of the reinforcing bar binding machine of the present embodiment. 
         FIG. 24B  is an example of operation and problem of the reinforcing bar binding machine according to the related art. 
         FIG. 25A  is an operational effect example of the reinforcing bar binding machine of the present embodiment. 
         FIG. 25B  is an operational effect example of the reinforcing bar binding machine of the present embodiment. 
         FIG. 25C  is an example of operation and problem of the reinforcing bar binding machine according to the related art. 
         FIG. 25D  is an example of operation and problem of the reinforcing bar binding machine according to the related art. 
         FIG. 26A  is an operational effect example of the reinforcing bar binding machine of the present embodiment. 
         FIG. 26B  is an example of operation and problem of the reinforcing bar binding machine according to the related art. 
         FIG. 27A  is a view illustrating a modified example of the second guide unit of the present embodiment. 
         FIG. 27B  is a view illustrating a modified example of the second guide unit of the present embodiment. 
         FIG. 28A  is a view illustrating a modified example of the parallel guide of the present embodiment. 
         FIG. 28B  is a view illustrating a modified example of the parallel guide of the present embodiment. 
         FIG. 28C  is a view illustrating a modified example of the parallel guide of the present embodiment. 
         FIG. 28D  is a view illustrating a modified example of the parallel guide of the present embodiment. 
         FIG. 28E  is a view illustrating a modified example of the parallel guide of the present embodiment. 
         FIG. 29  is a view illustrating a modified example of the guide groove of the present embodiment. 
         FIG. 30A  is a view illustrating a modified example of the wire feeding unit according to the present embodiment. 
         FIG. 30B  is a view illustrating a modified example of the wire feeding unit according to the present embodiment. 
         FIG. 31  is a view illustrating an example of a second guide unit according to another embodiment. 
         FIG. 32  is an explanatory view illustrating an example of an operation of the second guide unit according to another embodiment. 
         FIG. 33  is an explanatory view illustrating an example of an operation of the second guide unit according to another embodiment. 
         FIG. 34  is an explanatory view illustrating an example of an operation of the second guide unit according to another embodiment. 
         FIG. 35  is an explanatory view illustrating an example of an operation of the second guide unit according to another embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, an example of a reinforcing bar binding machine as an embodiment of a binding machine of the present invention will be described with reference to the drawings. 
     Example of Configuration of Reinforcing Bar Binding Machine of the Embodiment 
       FIG. 1  is a view of an example of the overall configuration of a reinforcing bar binding machine according to the present embodiment as seen from a side, and  FIG. 2  is a view illustrating an example of the overall configuration of the reinforcing bar binding machine of the present embodiment as seen from a front. Here,  FIG. 2  schematically illustrates the internal configuration of the line A-A in  FIG. 1 . 
     The reinforcing bar binding machine  1 A of the present embodiment binds the reinforcing bar S, which is a binding object, by using two or more wires W having a diameter smaller compared to a conventional wire having a large diameter. In the reinforcing bar binding machine  1 A, as will be described later, by the operation of winding the wire W around the reinforcing bar S, the operation of winding the wire W wound around the reinforcing bar S in close contact with the reinforcing bar S, and the operation of twisting the wire wound around the reinforcing bar S, the reinforcing bar S is bound with the wire W. In the reinforcing bar binding machine  1 A, since the wire W is bent in any of the operations described above, by using the wire W having a smaller diameter than the conventional wire, the wire is wound on the reinforcing bar S with less force, and it is possible to twist the wire W with less force. Further, by using two or more wires, it is possible to secure the binding strength of the reinforcing bar S by the wire W. In addition, by arranging two or more wires W to be fed in parallel, the time required for winding the wire W can be shortened compared with the operation of winding the reinforcing bar twice or more with one wire. It should also be noted that winding the wire W around the reinforcing bar S and winding the wire W wound around the reinforcing bar S in close contact with the reinforcing bar S is collectively referred to as winding the wire W. The wire W may be wound on a binding object other than the reinforcing bar S. Here, as the wire W, a single wire or a twisted wire made of a metal that can be plastically deformed is used. 
     The reinforcing bar binding machine  1 A includes a magazine  2 A that is a housing unit that houses the wire W, a wire feeding unit  3 A that feeds the wire W housed in the magazine  2 A, a parallel guide  4 A for arranging the wires W fed to the wire feeding unit  3 A and the wires W fed out from the wire feeding unit  3 A in parallel. The reinforcing bar binding machine  1 A further includes a curl guide unit  5 A that winds the wires W fed out in parallel around the reinforcing bar S, and a cutting unit  6 A that cuts the wire W wound around the reinforcing bar S. Further, the reinforcing bar binding machine  1 A includes a binding unit  7 A that grips and twists the wire W wound around the reinforcing bar S. 
     The magazine  2 A is an example of a housing unit. In the embodiment, a reel  20  having two long wires W wound thereon in a drawable manner is detachably housed in the magazine. The reel  20  is provided with a tubular hub portion  20   a  that can wind the wires W and a pair of flanges  20   b  that are provided at opposite end sides of the hub portion  20   a  in an axial direction. The flanges  20   b  have a larger diameter than the hub portion  20   a,  and protrudes beyond the opposite end sides of the hub portion  20   a  in the axial direction. Two or more wires W, in this example, two wires W are wound around the hub portion  20   a.  In the reinforcing bar binding machine  1 A, while the reel  20  housed in the magazine  2 A rotates, the two wires W are fed out from the reel  20  through the operation of feeding the two wires W by the wire feeding unit  3 A and the operation of feeding the two wires W manually. At this time, the two wires W are wound around the hub portion  20   a  so that the two wires W are fed out without being twisted. 
     The wire feeding unit  3 A is an example of a wire feeding unit constituting the feeding unit and includes a first gear  30 L in the form of a spur gear which feeds the wire W by a rotation operation as a pair of feeding members for feeding the parallel wires W, and a second feed gear  30 R also having a spur gear shape for sandwiching the wire W with the first feed gear  30 L. Although the details of the first feed gear  30 L and the second feed gear  30 R will be described later, the first feed gear  30 L and the second feed gear  30 R have a spur gear shape in which teeth are formed on the outer peripheral surface of a disk-like member. However, the first feed gear  30 L and the second feed gear  30 R are meshed with each other, and the driving force is transmitted from one feed gear to the other feed gear, so that the two wires W can be appropriately fed, it is not necessarily limited to a spur gear shape. 
     The first feed gear  30 L and the second feed gear  30 R are each formed of a disc-shaped member. In the wire feeding unit  3 A, the first feed gear  30 L and the second feed gear  30 R are provided so as to sandwich the feed path of the wire W, so that the outer peripheral surfaces of the first feed gear  30 L and the second feed gear  30 R face each other. The first feed gear  30 L and the second feed gear  30 R sandwich the two parallel wires W between a portions opposing to the outer peripheral surface. The first feed gear  30 L and the second feed gear  30 R feed two wires W along the extending direction of the wire W in a state where the two wires W are arranged in parallel with each other. 
       FIG. 3  is a view illustrating an example of the feed gear of this embodiment. Here,  FIG. 3  is a sectional view taken along the line B-B of  FIG. 2 . The first feed gear  30 L includes a tooth portion  31 L on its outer peripheral surface. The second feed gear  30 R includes a tooth portion  31 R on its outer peripheral surface. 
     The first feed gear  30 L and the second feed gear  30 R are arranged in parallel with each other so that the teeth portions  31 L and  31 R face each other. In other words, the first feed gear  30 L and the second feed gear  30 R are arranged in parallel in a direction along the axial direction Ru 1  of the loop Ru formed by the wire W wound by the curl guide unit  5 A, that is, along the axial direction of the virtual circle in which the loop Ru formed by the wire W is regarded as a circle. In the following description, the axial direction Ru 1  of the loop Ru formed by the wire W wound by the curl guide unit  5 A is also referred to as the axial direction Ru 1  of the loop of wire W. 
     The first feed gear  30 L includes a first feed groove  32 L on its outer peripheral surface. The second feed gear  30 R includes a second feed groove  32 R on its outer peripheral surface. The first feed gear  30 L and the second feed gear  30 R are arranged such that the first feed groove  32 L and the second feed groove  32 R face each other and the first feed groove  32 L and the second feed groove  32 R form a pinching portion. 
     The first feed groove  32 L is formed in a V-groove shape on the outer peripheral surface of the first feed gear  30 L along the rotation direction of the first feed gear  30 L. The first feed groove  32 L has a first inclined surface  32 La and a second inclined surface  32 Lb forming a V-shaped groove. The first feed groove  32 L has a V-shaped cross section so that the first inclined surface  32 La and the second inclined surface  32 Lb face each other at a predetermined angle. When the wires W are held between the first feed gear  30 L and the second feed gear  30 R in parallel, the first feed groove  32 L is configured such that one wire among the outermost wires of the wires W arranged in parallel, in this example, a part of the outer peripheral surface of one wire W 1  of the two wires W arranged in parallel is in contact with the first inclined surface  32 La and the second inclined surface  32 Lb. 
     The second feed groove  32 R is formed in a V-groove shape on the outer peripheral surface of the second feed gear  30 R along the rotation direction of the second feed gear  30 R. The second feed groove  32 R has a first inclined surface  32 Ra and a second inclined surface  32 Rb that form a V-shaped groove. Similarly to the first feed groove  32 L, the second feed groove  32 R has a V-shaped cross-sectional shape, and the first inclined surface  32 Ra and the second inclined surface  32 Rb face each other at a predetermined angle. When the wire W is held between the first feed gear  30 L and the second feed gear  30 R in parallel, the second feed groove  32 R is configured such that, the other wire among the outermost wires of the wires W arranged in parallel, in this example, a part of the outer peripheral surface of the other wire W 2  of the two wires W arranged in parallel is in contact with the first inclined surface  32 Ra and the second inclined surface  32 Rb. 
     When the wire W is pinched between the first feed gear  30 L and the second feed gear  30 R, the first feed groove  32 L is configured with a depth and an angle (between the first inclined surface  32 La and the second inclined surface  32 Lb) such that a part, on the side facing the second feed gear  30 R, of one wire W 1  in contact with the first inclined surface  32 La and the second inclined surface  32 Lb protrudes from the tooth bottom circle  31 La of the first feed gear  30 . 
     When the wire W is pinched between the first feed gear  30 L and the second feed gear  30 R, the second feed groove  32 R is configured with a depth and an angle (between the first inclined surface  32 Ra and the second inclined surface  32 Rb) such that a part, on the side facing the first feed gear  30 L, of the other wire W 2  in contact with the first inclined surface  32 Ra and the second inclined surface  32 Rb protrudes from the tooth bottom circle  31 Ra of the second feed gear  30 R. 
     As a result, the two wires W pinched between the first feed gear  30 L and the second feed gear  30 R are arranged such that one wire W 1  is pressed against the first inclined surface  32 La and the second inclined surface  32 Lb of the first feed groove  32 L, and the other wire W 2  is pressed against the first inclined surface  32 Ra and the second inclined surface  32 Rb of the second feeding groove  32 R. Then, one wire W 1  and the other wire W 2  are pressed against each other. Therefore, by rotation of the first feed gear  30 L and the second feed gear  30 R, the two wires W (one wire W 1  and the other wire W 2 ) are simultaneously fed between the first feed gear  30 L and the second feed gear  30 R while being in contact with each other. In this example, the first feed groove  32 L and the second feed groove  32 R have a V-shaped cross-sectional shape, but it is not necessarily limited to the V-groove shape, and it may be, for example, a trapezoidal shape or an arcuate shape. Further, in order to transmit the rotation of the first feed gear  30 L to the second feed gear  30 R, between the first feed gear  30 L and the second feed gear  30 R, a transmission mechanism including an even number of gears or the like for rotating the first feed gear  30 L and the second feed gear  30 R in opposite directions to each other may be provided. 
     The wire feeding unit  3 A includes a driving unit  33  for driving the first feed gear  30 L and a displacement unit  34  for pressing and separating the second feed gear  30 R against the first feed gear  30 L. 
     The driving unit  33  includes a feed motor  33   a  for driving the first feed gear  30 L and a transmission mechanism  33   b  including a combination of a gear and the like for transmitting the driving force of the feed motor  33   a  to the first feed gear  30 L. 
     In the first feed gear  30 L, the rotation operation of the feed motor  33   a  is transmitted via the transmission mechanism  33   b  and the first feed gear rotates. In the second feed gear  30 R, the rotation operation of the first feed gear  30 L is transmitted to the tooth portion  31 R via the tooth portion  31 L and the second feed gear rotates in accordance with the first feed gear  30 L. 
     As a result, by the rotation of the first feed gear  30 L and the second feed gear  30 R, due to the frictional force generated between the first feed gear  30 L and the one wire W 1 , the friction force generated between the second feed gear  30 R and the other wire W 2 , and the frictional force generated between the one wire W 1  and the other wire W 2 , the two wires W are fed in a state of being arranged in parallel with each other. 
     By switching the forward and backward directions of the rotation direction of the feed motor  33   a,  the wire feeding unit  3 A switches the direction of rotation of the first feed gear  30 L and the direction of rotation of the second feed gear  30 R, and the forward and reverse of the feeding direction of the wire W are switched. 
     In the reinforcing bar binding machine  1 A, by forward rotation of the first feed gear  30 L and the second feed gear  30 R in the wire feeding unit  3 A, the wire W is fed in the forward direction indicated by the arrow X 1 , that is, in the direction of the curl guide unit  5 A and is wound around the reinforcing bar S at the curl guide unit  5 A. Further, after the wire W is wound around the reinforcing bar S, the first feed gear  30 L and the second feed gear  30 R are reversely rotated, whereby the wire W is fed in the backward direction indicated by the arrow X 2 , that is, in the direction of the magazine  2 A (pulled back). The wire W is wound around the reinforcing bar S and then pulled back, whereby the wire W is brought into close contact with the reinforcing bar S. 
     The displacement unit  34  includes a first displacement member  35  that displaces the second feed gear  30 R in a direction in which the second feed gear  30 R is brought into close contact and separated with/from the first feed gear  30 L and a second displacement member  36  that displaces the first displacement member  35  in the rotation operation with the shaft  34   a  as a fulcrum. The second feed gear  30 R is pressed in the direction of the first feed gear  30 L by a spring (not illustrated) that biases the second displacement member  36 . Thus, in this example, the two wires W are held between the first feed groove  32 L of the first feed gear  30 L and the second feed groove  32 R of the second feed gear  30 R. Further, the tooth portion  31 L of the first feed gear  30 L and the tooth portion  31 R of the second feed gear  30 R mesh with each other. Here, the relationship between the first displacement member  35  and the second displacement member  36  is such that by displacing the second displacement member  36  to bring the first displacement member  35  into a free state, the second feed gear  30 R can be separated from the first feed gear  30 L. However, the first displacement member  35  and the second displacement member  36  may be interlocked with each other. 
       FIGS. 4A, 4B, and 4C  are views illustrating an example of a parallel guide according to the present embodiment. Here,  FIGS. 4A, 4B, and 4C  are cross-sectional views taken along the line C-C of  FIG. 2  and show the cross sectional shape of the parallel guide  4 A provided at the introduction position P 1 . Further, the cross-sectional view taken along a line D-D of  FIG. 2  illustrating the sectional shape of the parallel guide  4 A provided at the intermediate position P 2 , and the cross-sectional view taken along a line E-E of  FIG. 2  illustrating the sectional shape of the parallel guide  4 A provided at the cutting discharge position P 3  show the same shape. Further,  FIG. 4D  is a view illustrating an example of parallel wires, and  FIG. 4E  is a view illustrating an example of twisted wires intersecting each other. 
     The parallel guide  4 A is an example of a restricting unit constituting the feeding unit and restricts the direction of a plurality of (two or more) wires W that have been sent. Two or more wires W enter and the parallel guide  4 A feeds the two or more wires W in parallel. In the parallel guide  4 A, two or more wires are arranged in parallel along a direction orthogonal to the feeding direction of the wire W. Specifically, two or more wires W are arranged in parallel along the axial direction of the loop-like wire W wound around the reinforcing bar S by the curl guide unit  5 A. The parallel guide  4 A has a wire restricting unit (for example, an opening  4 AW described later) that restricts the directions and relative movement of the two or more wires W and makes them parallel. In this example, the parallel guide  4 A has a guide main body  4 AG, and the guide main body  4 AG is formed with an opening  4 AW which is the wire restricting unit for passing (inserting) a plurality of wires W. The opening  4 AW penetrates the guide main body  4 AG along the feeding direction of the wire W. When the plurality of sent wires W pass through the opening  4 AW and after passing through the opening  4 AW, the shape thereof is determined so that the plurality of wires W are arranged in parallel (that is, each of the plurality of wires W is aligned in a direction (radial direction) orthogonal to the feeding direction of the wire W (axial direction) and the axis of each of the plurality of wires W is substantially parallel to each other). Therefore, the plurality of wires W that have passed through the parallel guide  4 A go out from the parallel guide  4 A in a state of being arranged in parallel. In this way, the parallel guide  4 A restricts the direction and orientation in which the two wires W are aligned in the radial direction so that the two wires W are arranged in parallel. Therefore, in the opening  4 AW, one direction orthogonal to the feeding direction of the wire W is longer than the other direction which is orthogonal to the feeding direction of the wire W orthogonal to the one direction. The opening  4 AW has a longitudinal direction (in which two or more wires W can be juxtaposed) is disposed along a direction orthogonal to the feeding direction of the wire W, more specifically, along the axial direction of the wire W loop-shaped by the curl guide unit  5 A. As a result, two or more wires W inserted through the opening  4 AW are fed in parallel to the feeding direction of the wire W, and an axis of one wire is offset from an axis of the other wire in a direction parallel to the axial direction Ru 1  of the loop of wire W. 
     In the following description, when describing the shape of the opening  4 AW, a cross-sectional shape in a direction orthogonal to the feeding direction of the wire W will be described. The cross-sectional shape in the direction along the feeding direction of the wire W will be described in each case. 
     For example, when the opening  4 AW (the cross section thereof) is a circle having a diameter equal to or more than twice of the diameter of the wire W, or the length of one side is substantially a square which is twice or more the diameter of the wire W, the two wires W passing through the opening  4 AW are in a state where they can freely move in the radial direction. 
     If the two wires W passing through the opening  4 AW can freely move in the radial direction within the opening  4 AW, the direction in which the two wires W are arranged in the radial direction cannot be restricted, whereby the two wires W coming out from the opening  4 AW may not be in parallel, may be twisted or intersected. 
     In view of this, the opening  4 AW is formed such that the length in the one direction, that is, the length L 1  in the longitudinal direction is set to be slightly (n) times longer than the diameter r of the wire W in the form in which the plurality (n) of wires W are arranged along the radial direction, and the length in the other direction, that is, the length L 2  in the lateral direction is set to be slightly (n) times longer than the diameter r of one wire W. In the present example, the opening  4 AW has a length L 1  in the longitudinal direction slightly twice longer than a diameter r of the wire W, and a length L 2  in the lateral direction slightly longer than a diameter r of one wire W. In the present embodiment, the parallel guide  4 A is configured such that the longitudinal direction of the opening  4 AW is linear and the lateral direction is arcuate, but the configuration is not limited thereto. 
     In the example illustrated in  FIG. 6A , the length L 2  in the lateral direction of the parallel guide  4 A is set to a length slightly longer than the diameter r of one wire W as a preferable length. However, since it is sufficient that the wire W comes off from the opening  4 AW in a parallel state without intersecting or being twisted, in the configuration in which the longitudinal direction of the parallel guide  4 A is oriented along the axial direction Ru 1  of the loop of the wire W wound around the reinforcing bar S at the curl guide unit  5 A, the length L 2  of the parallel guide  4 A in the lateral direction, as illustrated in  FIG. 6B , may be within a range from a length slightly longer than the diameter r of one wire W to a length slightly shorter than the diameter r of two wires W. 
     Further, in the configuration in which the longitudinal direction of the parallel guide  4 A is oriented in a direction orthogonal to the axial direction Ru 1  of the loop of the wire W wound around the reinforcing bar S in the curl guide unit  5 A, as illustrated in  FIG. 6C , the length L 2  in the lateral direction of the parallel guide  4 A may be within a range from a length slightly longer than the diameter r of one wire W to a length shorter than the diameter r of two wires W. 
     In the parallel guide  4 A, the longitudinal direction of the opening  4 AW is oriented along a direction orthogonal to the feeding direction of the wire W, in this example, along the axial direction Ru 1  of the loop of the wire W wound around the reinforcing bar S in the curl guide unit  5 A. 
     As a result, the parallel guide  4 A can pass two wires in parallel along the axial direction Ru 1  of the loop of the wire W. 
     In the parallel guide  4 A, when the length L 2  in the lateral direction of the opening  4 AW is shorter than twice the diameter r of the wire W and slightly longer than the diameter r of the wire W, even if the length L 1  in the longitudinal direction of the opening  4 AW is sufficiently twice or more times longer than the diameter r of the wire W, it is possible to pass the wires W in parallel. 
     However, the longer the length L 2  in the lateral direction (for example, the length close to twice the diameter r of the wire W) and the longer the length L 1  in the longitudinal direction, the wire W can further freely move in the opening  4 AW. Then, the respective axes of the two wires W do not become parallel in the opening  4 AW, and there is a high possibility that the wires W are twisted or intersect each other after passing through the opening  4 AW. 
     Therefore, it is preferable that the longitudinal length L 1  of the opening  4 AW is slightly longer than twice the diameter r of the wire W, and the length L 2  in the lateral direction is also slightly longer than the diameter r of the wire W so that the two wires W are arranged in parallel in the feed direction, and are adjacent each other in the lateral or radial direction. 
     The parallel guide  4 A is provided at predetermined positions on the upstream side and the downstream side of the first feed gear  30 L and the second feed gear  30 R (the wire feeding unit  3 A) with respect to the feeding direction for feeding the wire W in the forward direction. By providing the parallel guide  4 A on the upstream side of the first feed gear  30 L and the second feed gear  30 R, the two wires W in a parallel state enter the wire feeding unit  3 A. Therefore, the wire feeding unit  3 A can feed the wire W appropriately (in parallel). Furthermore, by providing the parallel guide  4 A also on the downstream side of the first feed gear  30 L and the second feed gear  30 R, while maintaining the parallel state of the two wires W sent from the wire feeding unit  3 A, the wire W can be further sent to the downstream side. 
     The parallel guides  4 A provided on the upstream side of the first feed gear  30 L and the second feed gear  30 R are provided at the introduction position P 1  between the first feed gear  30 L and the second feed gear  30 R and the magazine  2 A such that the wires W fed to the wire feeding unit  3 A are arranged in parallel in a predetermined direction. 
     One of the parallel guides  4 A provided on the downstream side of the first feed gear  30 L and the second feed gear  30 R is provided at the intermediate position P 2  between the first feed gear  30 L and the second feed gear  30 R and the cutting unit  6 A such that the wires W fed to the cutting unit  6 A are arranged in parallel in the predetermined direction. 
     Further, the other one of the parallel guides  4 A provided on the downstream side of the first feed gear  30 L and the second feed gear  30 R is provided at the cutting discharge position P 3  where the cutting unit  6 A is disposed such that the wires W fed to the curl guide unit  5 A are arranged in parallel in the predetermined direction. 
     The parallel guide  4 A provided at the introduction position P 1  has the above-described shape in which at least the downstream side of the opening  4 AW restricts the radial direction of the wire W with respect to the feeding direction of the wire W sent in the forward direction. On the other hand, the opening area of the side facing the magazine  2 A (the wire introducing unit), which is the upstream side of the opening  4 AW with respect to the feeding direction of the wire W sent in the forward direction, has a larger opening area than the downstream side. Specifically, the opening  4 AW has a tube-shaped hole portion that restricts the direction of the wire W and a conical (funnel-shaped, tapered) hole portion in which an opening area gradually increases from the upstream side end of the tube-shaped hole portion to the inlet portion of the opening  4 AW as the wire introducing portion. By making the opening area of the wire introducing portion the largest and gradually reducing the opening area therefrom, it is easy to allow the wire W to enter the parallel guide  4 . Therefore, the work of introducing the wire W into the opening  4 AW can be performed easily. 
     The other parallel guide  4 A also has the same configuration, and the downstream opening  4 AW with respect to the feeding direction of the wire W sent in the forward direction has the above-described shape that restricts the direction of the wire W in the radial direction. Further, with regard to the other parallel guide  4 , the opening area of the opening on the upstream side with respect to the feeding direction of the wire W sent in the forward direction may be made larger than the opening area of the opening on the downstream side. 
     The parallel guide  4 A provided at the introduction position P 1 , the parallel guide  4 A provided at the intermediate position P 2 , and the parallel guide  4 A provided at the cutting discharge position P 3  are arranged such that the longitudinal direction of the opening  4 AW orthogonal to the feeding direction of the wire W is in the direction along the axial direction Rut of the loop of wire W wound around the reinforcing bar S. 
     As a result, as illustrated in  FIG. 4D , the two wires W sent by the first feed gear  30 L and the second feed gear  30 R are sent while maintaining a state of being arranged in parallel in the axial direction Ru  1  of the loop of wire W wound around the reinforcing bar S, and, as illustrated in  FIG. 4E , the two wires W are prevented from intersecting and being twisted during feeding. 
     In the present example, the opening  4 AW is a tube-shaped hole having a predetermined depth (a predetermined distance or depth from the inlet to the outlet of the opening  4 AW) from the inlet to the outlet of the opening  4 AW (in the feeding direction of the wire W), but the shape of the opening  4 AW is not limited to this. For example, the opening  4 AW may be a planar hole having almost no depth with which the plate-like guide main body  4 AG is opened. Further, the opening  4 AW may be a groove-shaped guide (for example, a U-shaped guide groove with an opened upper portion) instead of the hole portion penetrating through the guide main body  4 AG. Furthermore, in the present example, the opening area of the inlet portion of the opening  4 AW as the wire introducing portion is made larger than the other portion, but it may not necessarily be larger than the other portion. The shape of the opening  4 AW is not limited to a specific shape as long as the plurality of wires that have passed through the opening  4 AW and come out of the parallel guide  4 A are in a parallel state. 
     Hitherto, an example in which the parallel guide  4 A is provided at the upstream side (introduction position P  1 ) and a predetermined position (intermediate position P 2  and cutting discharge position P 3 ) on the downstream side of the first feed gear  30 L and the second feed gear  30 R is described. However, the position where the parallel guide  4 A is installed is not necessarily limited to these three positions. That is, the parallel guide  4 A may be installed only in the introduction position P 1 , only in the intermediate position P 2 , or only in the cutting discharge position P 3 , and only in the introduction position P 1  and the intermediate position P 2 , only in the introduction position P 1  and the cutting discharge position P 3 , or only in the intermediate position P 2  and the cutting discharge position P 3 . Further, four or more parallel guides  4 A may be provided at any position between the introduction position P 1  and the curl guide unit  5 A on the downstream side of the cutting position P 3 . The introduction position P 1  also includes the inside of the magazine  2 A. That is, the parallel guide  4 A may be arranged in the vicinity of the outlet from which the wire W is drawn inside the magazine  2 A. 
     The curl guide unit  5 A is an example of guide unit constituting the feeding unit and constitutes a conveying path for winding the two wires W around the reinforcing bars S in a loop shape. The curl guide unit  5 A includes a first guide unit  50  for curling the wire W sent by the first feed gear  30 L and the second feed gear  30 R arid a second guide unit  51  for guiding the wire W fed from the first guide unit  50  to the binding unit  7 A. 
     The first guide unit  50  includes guide grooves  52  constituting a feed path of the wire W and guide pins  53  and  53   b  as a guide member for curling the wire W in cooperation with the guide groove  52 .  FIG. 5  is a view illustrating an example of the guide groove of the present embodiment.  FIG. 5  is a sectional view taken along the line G-G of  FIG. 2 . 
     The guide groove  52  forms a guide unit and restricts a direction in the radial direction of movement the wire W orthogonal to the feeding direction of the wire W together with the parallel guide  4 A. Therefore, in this example, the guide groove  52  is configured by an opening with an elongated shape in which one direction orthogonal to the feeding direction of the wire W is longer than the other direction orthogonal to the feeding direction of the wire W and orthogonal to the one direction. 
     The guide groove  52  has a longitudinal length L 1 , that is, a length in a width direction of the groove slightly longer than a plurality of diameters r of a plurality of the wires W in a form in which the wires W are arranged along the radial direction and a lateral length L 2  in the lateral direction has a length slightly longer than the diameter r of one wire W. In the present embodiment, the length L 1  of the guide groove  52  in the longitudinal direction is slightly longer than the diameter r of two wires W. In the guide groove  52 , the longitudinal direction of the opening is arranged in the direction along the axial direction Ru 1  of the loop of wire W. It should be noted that the guide groove  52  may not necessarily have the function of restricting the direction of the wire W in the radial direction. In that case, the length (length) in the longitudinal direction and in the lateral direction of the guide groove  52  is not limited to the above-described size. 
     The guide pin  53  is provided on the side of the introducing portion of the wire W that is fed by the first feed gear  30 L and the second feed gear  30 R in the first guide unit  50  and is arranged inside the loop Ru formed by the wire W in the radial direction with respect to the feed path of the wire W by the guide groove  52 . The guide pin  53  restricts the feed path of the wire W so that the wire W fed along the guide groove  52  does not enter the inside of the loop Ru formed by the wire W in the radial direction. 
     The guide pin  53   b  is provided on the side of the discharge portion of the wire W which is fed by the first feed gear  30 L and the second feed gear  30 R in the first guide unit  50  and is arranged on the outer side in the radial direction of the loop Ru formed by the wire W with respect to the feed path of the wire W by the guide groove  52 . 
     In the wire W sent by the first feed gear  30 L and the second feed gear  30 R, the radial position of the loop Ru formed by the wire W is restricted at least at three points including two points on the outer side in the radial direction of the loop Ru formed by the wire W and at least one point on the inner side between the two points, so that the wire W is curled. 
     In this example, the radially outer position of the loop Ru formed by the wire W is restricted at two points of the parallel guide  4 A at the cutting discharge position P 3  provided on the upstream side of the guide pin  53  with respect to the feeding direction of the wire W sent in the forward direction and the guide pin  53   b  provided on the downstream side of the guide pin  53 . Further, the radially inner position of the loop Ru formed by the wire W is restricted by the guide pin  53 . 
     The curl guide unit  5 A includes a retreat mechanism  53   a  for allowing the guide pin  53  to retreat from a path through which the wire W moves by an operation of winding the wire W around the reinforcing bar S. After the wire W is wound around the reinforcing bar S, the retreat mechanism  53   a  is displaced in conjunction with the operation of the binding unit  7 A, and retreats the guide pin  53  from the path where the wire W moves before the timing of winding the wire W around the reinforcing bar S. 
     The second guide unit  51  includes a fixed guide unit  54  as a third guide unit for restricting the radial position of the loop Ru (movement of the wire W in the radial direction of the loop Ru) formed by the wire W wound around the reinforcing bar S and a movable guide unit  55  serving as a fourth guide unit for restricting the position along the axial direction Ru 1  of the loop Ru formed by the wire W wound around the reinforcing bar S (movement of the wire W in the axial direction Ru 1  of the loop Ru). 
       FIGS. 6, 7A, 7B, 8A, and 8B  are views illustrating an example of a second guide unit,  FIG. 6  is a plan view of the second guide unit  51  as viewed from above,  FIGS. 7A and 7B  are side views of the second guide unit  51  as viewed from one side, and  FIGS. 8A and 8B  are side views of the second guide unit  51  as viewed from the other side. 
     The fixed guide unit  54  is provided with a wall surface  54   a  as a surface extending along the feeding direction of the wire W on the outer side in the radial direction of the loop Ru formed by the wire W wound around the reinforcing bar S. When the wire W is wound around the reinforcing bar S, the wall surface  54   a  of the fixed guide unit  54  restricts the radial position of the loop Ru formed by the wire W wound around the reinforcing bar S . The fixed guide unit  54  is fixed to the main body  10 A of the reinforcing bar binding machine  1 A, and the position thereof is fixed with respect to the first guide unit  50 . The fixed guide unit  54  may be integrally formed with the main body  10 A. In addition, in the configuration in which the fixed guide unit  54 , which is a separate component, is attached to the main body  10 A, the fixed guide unit  54  is not perfectly fixed to the main body  10 A, but in the operation of forming the loop Ru may be movable to such an extent that movement of the wire W can be restricted. 
     The movable guide unit  55  is provided on the distal end side of the second guide unit  51  and includes a wall surface  55   a  that is provided on both sides along the axial direction Ru 1  of the loop Ru formed by the wire W wound around the reinforcing bar S and is erected inward in the radial direction of the loop Ru from the wall surface  54   a.  When the wire W is wound around the reinforcing bar S, the movable guide unit  55  restricts the position along the axial direction Ru 1  of the loop Ru formed by the wire W wound around the reinforcing bar S using the wall surface  55   a.  The wall surface  55   a  of the movable guide unit  55  has a tapered shape in which the gap of the wall surfaces  55   a  is spread at the distal end side where the wire W sent from the first guide unit  50  enters and narrows toward the fixed guide unit  54   b.  As a result, the position of the wire W sent from the first guide unit  50  in the axial direction Ru 1  of the loop Ru formed by the wire W wound around the reinforcing bar S is restricted by the wall surface  55   a  of the movable guide unit  55 , and guided to the fixed guide unit  54  by the movable guide unit  55 . 
     The movable guide unit  55  is supported on the fixed guide unit  54  by a shaft  55   b  on the side opposite to the distal end side into which the wire W sent from the first guide unit  50  enters. In the movable guide unit  55 , the distal end side thereof into which the wire W fed from the first guide unit  50  enters is opened and closed in the direction to come into contact with and separate from the first guide unit  50  by the rotation operation of the loop Ru formed by the wire W wound around the reinforcing bar S along the axial direction Ru 1  with the shaft  55   b  as a fulcrum. 
     In the reinforcing bar binding machine, when binding the reinforcing bar S, between a pair of guide members provided for winding the wire W around the reinforcing bar S, in this example, between the first guide unit  50  and the second guide unit  51 , a reinforcing bar is inserted (set) and then the binding work is performed. When the binding work is completed, in order to perform the next binding work, the first guide unit  50  and the second guide unit  51  are pulled out from the reinforcing bar S after the completion of the binding. In the case of pulling out the first guide unit  50  and the second guide unit  51  from about the reinforcing bar S, if the reinforcing bar binding machine  1 A is moved in the direction of the arrow Z 3  (see  FIG. 1 ) which is one direction of separation from the reinforcing bar S, the reinforcing bar S can be pulled out from the first guide unit  50  and the second guide unit  51  without any problem. However, for example, when the reinforcing bar S is arranged at a predetermined interval along the arrow Y 2  and these reinforcing bars S are sequentially bound, moving the reinforcing bar binding machine  1 A in the direction of the arrow Z 3  after each binding is troublesome, and if it can be moved in the direction of arrow Z 2 , the binding work can be performed quickly. However, in the conventional reinforcing bar binding machine disclosed in, for example, Japanese Patent No. 4747456, since the guide member corresponding to the second guide unit  51  in the present example is fixed to the binding machine body, when trying to move the reinforcing bar binding machine in the direction of the arrow Z 2 , the guide member is caught on the reinforcing bar S. Therefore, in the reinforcing bar binding machine  1 A, the second guide unit  51  (the movable guide unit  55 ) is made movable as described above and the reinforcing bar binding machine  1 A is moved in the direction of the arrow Z 2  so that the reinforcing bar S is more easily pulled out from between the first guide unit  50  and the second guide unit  51 . 
     Therefore, the movable guide unit  55  rotates about the shaft  55   b  as a fulcrum, and thus opened and closed between a guide position at which the wire W sent out from the first guide unit  50  can be guided to the second guide unit  51  and a retreat position at which the reinforcing bar binding machine  1 A is moved in the direction of the arrow Z 2  and then is retreated in the operation of pulling out the reinforcing bar binding machine  1 A from the reinforcing bar S. 
     The movable guide unit  55  is urged in a direction in which the distance between the distal end side of the first guide unit  50  and the distal end side of the second guide unit  51  is reduced by the urging unit (biasing unit) such as a torsion coil spring  57 , and is held in the guide position illustrated in  FIGS. 7A and 8A  by the force of the torsion coil spring  57 . In addition, when the movable guide unit  55  is pushed to the reinforcing bar S by the operation of pulling out the reinforcing bar binding machine  1 A from the reinforcing bar S, the movable guide unit  55  is opened from the guide position to the retreat position illustrated in  FIGS. 7B and 8B . The guide position is a position where the wall surface  55   a  of the movable guide unit  55  exists at a position where the wire W forming the loop Ru passes. The retreat position is a position at which at which the reinforcing bar S presses the movable guide unit  55  by the movement of the reinforcing bar binding machine  1 A, and the reinforcing bar S can be pulled out from between the first guide unit  50  and the second guide unit  51 . Here, the direction in which the reinforcing bar binding machine IA is moved is not uniform, and even if the movable guide unit  55  slightly moves from the guide position, the reinforcing bar S can be pulled out from between the first guide unit  50  and the second guide unit  51 , and thus a position slightly moved from the guide position is also included in the retreat position. 
     The reinforcing bar binding machine  1 A includes a guide opening/closing sensor  56  that detects opening and closing of the movable guide unit  55 . The guide opening/closing sensor  56  detects the closed state and the open state of the movable guide unit  55 , and outputs a predetermined detection signal. 
     The cutting unit  6 A includes a fixed blade unit  60 , a rotary blade unit  61  for cutting the wire W in cooperation with the fixed blade unit  60 , and a transmission mechanism  62  which transmits the operation of the binding unit  7 A, in this example, the operation of a movable member  83  (to be described later) moving in a liner direction to the rotary blade unit  61  and rotates the rotary blade unit  61 . The fixed blade unit  60  is configured by providing an edge portion capable of cutting the wire W in the opening through which the wire W passes. In the present example, the fixed blade unit  60  includes a parallel guide  4 A arranged at the cutting discharge position P 3 . 
     The rotary blade unit  61  cuts the wire W passing through the parallel guide  4 A of the fixed blade unit  60  by the rotation operation with the shaft  61   a  as a fulcrum. The transmission mechanism  62  is displaced in conjunction with the operation of the binding unit  7 A, and after the wire W is wound around the reinforcing bar S, the rotary blade unit  61  is rotated according to the timing of twisting the wire W to cut the wire W. 
     The binding unit  7 A is an example of a binding unit, and includes a gripping unit  70  that grips the wire W and a bending unit  71  configured to bend one end WS side and the other end WE side of the wire W gripped by the gripping unit  70  toward the reinforcing bar S. 
     The gripping unit  70  is an example of a gripping unit, and includes a fixed gripping member  70 C, a first movable gripping member  70 L, and a second movable gripping member  70 R as illustrated in  FIG. 2 . The first movable gripping member  70 L and the second movable gripping member  70 R are arranged in the lateral direction via the fixed gripping member  70 C. Specifically, the first movable gripping member  70 L is disposed on one side along the axial direction of the wire W to be wound around, with respect to the fixed gripping member  70 C, and the second movable gripping member  70 R is disposed on the other side. 
     The first movable gripping member  70 L is displaced in a direction to come into contact with and separate from the fixed gripping member  70 C. In addition, the second movable gripping member  70 R is displaced in a direction to come into contact with and separate from the fixed gripping member  70 C. 
     As the first movable gripping member  70 L moves in a direction away from the fixed gripping member  70 C, in the gripping unit  70 , a feed path through which the wire W passes between the first movable gripping member  70 L and the fixed gripping member  70 C is formed. On the other hand, as the first movable gripping member  70 L moves toward the fixed gripping member  70 C, the wire W is gripped between the first movable gripping member  70 L and the fixed gripping member  70 C. 
     When the second movable gripping member  70 R moves in a direction away from the fixed gripping member  70 C, in the gripping unit  70  forms a feed path through which the wire W passes between the second movable gripping member  70 R and the fixed gripping member  70 C is formed. On the other hand, as the second movable gripping member  70 R moves toward the fixed gripping member  70 C, the wire W is gripped between the second movable gripping member  70 R and the fixed gripping member  70 C. 
     The wire W sent by the first feed gear  30 L and the second feed gear  30 R and passed through the parallel guide  4 A at the cutting discharge position P 3  passes between the fixed gripping member  70 C and the second movable gripping member  70 R and is guided to the curl guide unit  5 A. The wire W which has been wound by the curl guide unit  5 A passes between the fixed gripping member  70 C and the first movable gripping member  70 L. 
     Therefore, the first gripping unit for gripping one end WS side of the wire W is constituted by a pair of gripping members, for example, the fixed gripping member  70 C and the first movable gripping member  70 L. Further, the fixed gripping member  70 C and the second movable gripping member  70 R constitute a second gripping unit for gripping the other end WE side of the wire W cut by the cutting unit  6 A. 
       FIGS. 9A and 9B  are views illustrating main parts of the gripping unit of this embodiment. The first movable gripping member  70 L includes a protrusion  70 Lb protruding toward the fixed gripping member  70 C on a surface facing the fixed gripping member  70 C. On the other hand, the fixed gripping member  70 C includes a recess  73 , into which the protrusion  70 Lb of the first movable gripping member  70 L is inserted, on a surface facing the first movable gripping member  70 L. Accordingly, when the wire W is gripped with the first movable gripping member  70 L and the fixed gripping member  70 C, the wire W is bent toward the first movable gripping member  70 L. 
     Specifically, the fixed gripping member  70 C includes a preliminary bending portion  72 . The preliminary folding portion  72  is configured such that a protrusion protruding toward the first movable gripping member  70 L is provided at a downstream end along the feeding direction of the wire W fed in the forward direction on the surface facing the first movable gripping member  70 L of the fixed gripping member  70 C. 
     In order to grip the wire W between the fixed gripping member  70 C and the first movable gripping member  70 L and prevent the gripped wire W from being pulled out, the gripping unit  70  has the protrusion portion  72   b  and the recess portion  73  on the fixed gripping member  70 C. The protrusion portion  72   b  is provided on the upstream end along the feeding direction of the wire W fed in the forward direction on the surface facing the first movable gripping member  70 L of the fixed gripping member  70 C and protrudes to the first movable gripping member  70 L. The recess portion  73  is provided between the preliminary bending portion  72  and the protrusion portion  72   b  and has a recess shape in a direction opposite to the first movable gripping member  70 L. 
     The first movable gripping member  70 L has a recess portion  70 La into which the preliminary bending portion  72  of the fixed gripping member  70 C enters and a protrusion portion  70 Lb which enters the recess portion  73  of the fixed gripping member  70 C. 
     As a result, as illustrated in  FIG. 9B , by the operation of gripping one end WS side of the wire W between the fixed gripping member  70 C and the first movable gripping member  70 L, the wire W is pressed by the preliminary bending portion  72  on the first movable gripping member  70 L side, and one end WS of the wire W is bent in a direction away from the wire W gripped by the fixed gripping member  70 C and the second movable gripping member  70 R. 
     Gripping the wire W with the fixed gripping member  70 C and the second movable gripping member  70 R includes a state in which the wire W can move freely to some extent between the fixed gripping member  70 C and the second movable gripping member  70 R. This is because, in the operation of winding the wire W around the reinforcing bar S, it is necessary to move the wire W between the fixed gripping member  70 C and the second movable gripping member  70 R. 
     The bending portion  71  is an example of a bending unit which bends the wires W such that the end portions of the wires W are located closer to the binding objects than a top portions of the wires W that fully protrude in the direction away from the binding objects after the wires W bind the binding objects. The bending portion  71  bends the wires W gripped by the gripping unit  70  before the wires W are twisted by the gripping unit  70 . 
     The bending portion  71  is, an example of a binding unit, provided around the gripping unit  70  so as to cover a part of the gripping unit  70 , and is provided so as to be movable along the axial direction of the gripping unit  70 . Specifically, the bending portion  71  is configured to approach the one end WS side of the wire W gripped by the fixed gripping member  70 C and the first movable gripping member  70 L and the other end WE side of the wire W gripped by the fixed gripping member  70 C and the second movable gripping member  70 R, to be movable in the direction in which the one end WS side and the other end WE side of the wire W are bent in the forward/backward direction that is the direction away from the bent wires W. 
     The bending portion  71  moves in the forward direction (see  FIG. 1 ) indicated by an arrow F, so that one end WS side of the wire W gripped by the fixed gripping member  70 C and the first movable gripping member  70 L is bent to the reinforcing bar S side with the gripping position as the fulcrum. Further, the bending portion  71  moves in the forward direction indicated by the arrow F, whereby the other end WE side of the wire W between the fixed gripping member  70 C and the second movable gripping member  70 R is bent to the reinforcing bar S side with the gripping position as the fulcrum. 
     The wire W is bent by the movement of the bending portion  71 , so that the wire W passing between the second movable gripping member  70 R and the fixed gripping member  70 C is pressed by the bending portion  71 , and the wire W is prevented from coming off between the fixed gripping member  70 C and the second movable gripping member  70 R. 
     The binding unit  7 A includes a length restricting unit  74  that restricts the position of one end WS of the wire W. The length restricting unit  74  is constituted by providing a member against which the one end WS of the wire W abuts in the feed path of the wire W that has passed between the fixed gripping member  70 C and the first movable gripping member  70 L. In order to secure a predetermined distance from the gripping position of the wire W by the fixed gripping member  70 C and the first movable gripping member  70 L, the length restricting unit  74  is provided in the first guide unit  50  of the curl guide unit  5 A in this example. 
     The reinforcing bar binding machine  1 A includes a binding unit driving mechanism  8 A that drives the binding unit  7 A. The binding unit driving mechanism  8 A includes a motor  80 , a rotary shaft  82  driven by the motor  80  via a speed reducer  81  that performs deceleration and torque amplification, a movable member  83  that is displaced by a rotation operation of the rotary shaft  82 , and a rotation restricting member  84  that restricts the rotation of the movable member  83  interlocking with the rotation operation of the rotary shaft  82 . 
     In the rotary shaft  82  and the movable member  83 , by the screw portion provided on the rotary shaft  82  and the nut portion provided in the movable member  83 , the rotation operation of the rotary shaft  82  is converted to the movement of the movable member  83  along the rotary shaft  82  in the forward and backward direction. 
     The movable member  83  is locked to the rotation restricting member  84  in the operation region where the wire W is gripped by the gripping unit  70 , and then the wire W is bent by the bending portion  71 , so that the movable member  83  moves in the forward and backward direction in a state where the rotation operation is restricted by the rotation restricting member  84 . Further, the movable member  83  is rotated by the rotation operation of the rotary shaft  82  by coming off from the locking of the rotation restricting member  84 . 
     In this example, the movable member  83  is connected to the first movable gripping member  70 L and the second movable gripping member  70 R via a cam (not illustrated). The binding unit driving mechanism  8 A is configured that the movement of the movable member  83  in the forward and backward direction is converted into the operation of displacing the first movable gripping member  70 L in the direction to come into contact with and separate from the fixed gripping member  70 C, and the operation of displacing the second movable gripping member  70 R in the direction to come into contact with and separate from the fixed gripping member  70 C. 
     Further, in the binding unit driving mechanism  8 A, the rotation operation of the movable member  83  is converted into the rotation operation of the fixed gripping member  70 C, the first movable gripping member  70 L and the second movable gripping member  70 R. 
     Furthermore, in the binding unit driving mechanism  8 A, the bending portion  71  is provided integrally with the movable member  83 , so that the bending portion  71  moves in the forward and backward direction by the movement of the movable member  83  in the forward and backward direction. 
     The retreat mechanism  53   a  of the guide pin  53  is configured by a link mechanism that converts the movement of the movable member  83  in the forward and backward direction into displacement of the guide pin  53 . The transmission mechanism  62  of the rotary blade portion  61  is configured by a link mechanism that converts the movement of the movable member  83  in the forward and backward direction into the rotation operation of the rotary blade portion  61 . 
     The reinforcing bar binding machine  1 A according to the present embodiment is a form used by a worker in hand and includes a main body  10 A and a handle portion  11 A. As illustrated in  FIG. 1  and the like, the reinforcing bar binding machine  1 A incorporates a binding unit  7 A and a binding unit driving mechanism  8 A in the main body  10 A and has a curl guide unit  5 A (not illustrated) at one end side in the longitudinal direction (first direction Y 1 ). Further, the handle portion  11 A is provided so as to protrude from the other end side in the longitudinal direction of the main body I OA in one direction (second direction Y 2 ) substantially orthogonal (intersecting) with the longitudinal direction. Further, the wire feeding unit  3 A is provided on the side along the second direction Y 2  with respect to the binding unit  7 A, the displacement unit  34  is provided on the other side along the first direction Y 1  with respect to the wire feeding unit  3 A, that is, on the handle portion  11 A with respect to the wire feeding unit  3 A in the main body  10 A, and the magazine  2 A is provided on the side along the second direction Y 2  with respect to the wire feeding unit  3 A. 
     Thus, the magazine  2 A is provided on one side along the first direction Y 1  with respect to the handle portion  11 A. A trigger  12 A is provided at one side along the first direction Y 1  of the handle portion  11 A, and the control unit  14 A controls the feed motor  33   a  and the motor  80  according to the state of the switch  13 A pressed by the operation of the trigger  12 A. Further, a battery  15 A is detachably attached to an end portion along a second direction Y 2  of the handle portion  11 A. 
     Example of Operation of Reinforcing Bar Binding Machine in this Embodiment 
       FIGS. 10 to 17  are diagrams for explaining the operation of the reinforcing bar binding machine  1 A according to the present embodiment, and  FIGS. 18A, 18B, and 18C  are diagrams for explaining the operation of winding the wire on the reinforcing bar.  FIGS. 19A and 19B  are explanatory views for explaining the operation of forming a loop with a wire by the curl guide unit, and  FIGS. 20A, 20B, and 20C  are explanatory views of the operation of bending the wire. Next, with reference to the drawings, the operation of binding the reinforcing bar S with the wire W by the reinforcing bar binding machine  1 A of this embodiment will be described. 
       FIG. 10  illustrates the origin state, that is, the initial state in which the wire W has not yet been sent by the wire feeding unit  3 A. In the origin state, the tip of the wire W stands by at the cutting discharge position P 3 . As illustrated in  FIG. 18A , in this example, the wire W waiting at the cutting discharge position P  3  is passed through the parallel guide  4 A (fixed blade portion  60 ) in which the two wires W are provided at the cutting discharge position P 3 , and are arranged in a predetermined direction. 
     In the wire W between the cutting discharge position P 3  and the magazine  2 A, the parallel guide  4 A at the intermediate position P 2  and the parallel guide  4 A at the introduction position P 1  are arranged in parallel in a predetermined direction by the first feed gear  30 L and the second feed gear  30 R. 
       FIG. 11  illustrates a state in which the wire W is wound around the reinforcing bar S. When the reinforcing bar S is inserted between the first guide unit  50  and the second guide unit  51  of the curl guide unit  5 A and the trigger  12 A is operated, the feed motor  33   a  is driven in the normal rotation direction, and thus the first feed gear  30 L rotates in forward direction and the second feed gear  30 R rotates in the forward direction while following the first feed gear  30 L. 
     Therefore, the two wires W are fed in the forward direction by the frictional force generated between the first feed gear  30 L and the one wire W 1 , the frictional force generated between the second feed gear  30 R and the other wire W 2 , and the frictional force generated between the one wire W 1  and the other wire W 2 . 
     Two wires W entering between the first feed groove  32 L of the first feed gear  30 L and the second feed groove  32 R of the second feed gear  30 R, and two wires W discharged from the first feed gear  30 L and the second feed gear  30 R are fed in parallel with each other in a predetermined direction by providing the parallel guides  4 A on the upstream side and the downstream side of the wire feeding unit  3 A with respect to the feeding direction of the wire W fed in the forward direction. 
     When the wire W is fed in the forward direction, the wire W passes between the fixed gripping member  70 C and the second movable gripping member  70 R and passes through the guide groove  52  of the first guide unit  50  of the curl guide unit  5 A. As a result, the wire W is curled so as to be wound around the reinforcing bar S. The two wires W introduced into the first guide unit  50  are held in a state of being arranged in parallel by the parallel guide  4 A at the cutting discharge position P 3 . Further, since the two wires W are fed in a state of being pressed against the outer wall surface of the guide groove  52 , the wires W passing through the guide groove  52  are also held in a state of being arranged in parallel in a predetermined direction. 
     As illustrated in  FIG. 19A , the wire W fed from the first guide unit  50  is restricted to move along the axial direction Ru 1  of the loop Ru formed by the wire to be wound therearound by the movable guide unit  55  of the second guide unit  51 , to be guided to the fixed guide unit  54  by the wall surface  55   a . In  FIG. 19B , the movement of the wire W along the radial direction of the loop Ru, which is guided to the fixed guide unit  54 , is restricted by the wall surface  54   a  of the fixed guide unit  54 , and the wire W is guided between the fixed gripping member  70 C and the first movable gripping member  70 L. Then, when the distal end of the wire W is fed to a position where it abuts against the length restricting unit  74 , driving of the feed motor  33   a  is stopped. 
     A slight amount of wire W is fed in the forward direction until the distal end of the wire W abuts against the length restricting unit  74  and then the feeding is stopped, whereby the wire W wound around the reinforcing bar S is displaced from the state illustrated by the solid line in  FIG. 19B  in the direction expanding in the radial direction of the loop Ru as indicated by the two-dot chain line. When the wire W wound around the reinforcing bar S is displaced in the direction expanding in the radial direction of the loop Ru, one end WS side of the wire W guided between the fixed gripping member  70 C and the first movable gripping member  70 L by the gripping unit  70  is displaced backward. Therefore, as illustrated in  FIG. 19B , the position of the wire W in the radial direction of the loop Ru is restricted by the wall surface  54   a  of the fixed guide unit  54 , whereby the displacement of the wire W guided to the gripping unit  70  in the radial direction of the loop Ru is suppressed, and occurrence of gripping failure is suppressed. In the present embodiment, even when the one end WS side of the wire W guided between the fixed gripping member  70 C and the first movable gripping member  70 L is not displaced, and the wire W is displaced in a direction of spreading in the radial direction of the loop Ru, the displacement of the wire W in the radial direction of the loop Ru is suppressed by the fixed guide unit  54 , thereby suppressing the occurrence of gripping failure. 
     As a result, the wire W is wound in a loop shape around the reinforcing bar S. At this time, as illustrated in  FIG. 18B , the two wires W wound around the reinforcing bar S are held in a state in which they are arranged in parallel with each other without being twisted. When detecting that the movable guide unit  55  of the second guide unit  51  is opened by the output of the guide opening/closing sensor  56 , the control unit  14 A does not drive the feed motor  33   a  even when the trigger  12 A is operated. Instead, notification is performed by a notifying unit (not illustrated) such as a lamp or a buzzer. This prevents occurrence of guidance failure of the wire W. 
       FIG. 12  illustrates a state where the wire W is gripped by the gripping unit  70 . After stopping the feeding of the wire W, the motor  80  is driven in the normal rotation direction, whereby the motor  80  moves the movable member  83  in the direction of the arrow F which is the forward direction. That is, in the movable member  83 , the rotation operation interlocked with the rotation of the motor  80  is restricted by the rotation restricting member  84 , and the rotation of the motor  80  is converted into a linear movement. As a result, the movable member  83  moves in the forward direction. In conjunction with the operation of the movable member  83  moving in the forward direction, the first movable gripping member  70 L is displaced in a direction approaching the fixed gripping member  70 C, and one end WS side of the wire W is gripped. 
     Further, the operation of the movable member  83  moving in the forward direction is transmitted to the retreat mechanism  53   a,  and the guide pin  53  is retreated from the path through which the wire W moves. 
       FIG. 13  illustrates a state where the wire W is wound around the reinforcing bar S. After the one end WS side of the wire W is gripped between the first movable gripping member  70 L and the fixed gripping member  70 C, and the feed motor  33   a  is driven in the reverse rotation direction, the first feed gear  30 L rotates reversely and the second feed gear  30 R rotates reversely following the first feed gear  30 L. 
     Therefore, the two wires W are pulled back toward the magazine  2 A and are fed in the opposite (backward) direction. In the operation of feeding the wire W in the backward direction, the wire W is wound so as to be in close contact with the reinforcing bar S. In this example, as illustrated in  FIG. 18C , since two wires are arranged in parallel with each other, an increase in feed resistance due to twisting of the wires W in the operation of feeding the wire W in the opposite direction is suppressed. Further, in the case where the same binding strength is to be obtained between the case where the reinforcing bar S is bound with a single wire as in the conventional case and the case where the reinforcing bar S is bound with the two wires W as in this example, the diameter of each wire W can be made thinner by using two wires W. Therefore, it is easy to bend the wire W, and the wire W can be brought into close contact with the reinforcing bar S with a small force. Therefore, the wire W can be reliably wound around the reinforcing bar S in close contact with a small force. In addition, by using two thin wires W, it is easy to make the wire W in a loop shape, and it is also possible to reduce the load at the time of cutting the wire W. Along with this, it is possible to downsize each motor of the reinforcing bar binding machine  1 A, and downsize the entire main body by downsizing the mechanical section. In addition, it is possible to reduce power consumption by reducing the size of the motor and reducing the load. 
       FIG. 14  illustrates a state in which the wire W is cut. After winding the wire W around the reinforcing bar S, and stopping the feeding of the wire W, the motor  80  is driven in the normal rotation direction, thereby moving the movable member  83  in the forward direction. In conjunction with the operation of the movable member  83  moving in the forward direction, the second movable gripping member  70 R is displaced in a direction approaching the fixed gripping member  70 C, and the wire W is gripped. In addition, the operation of the movable member  83  moving in the forward direction is transmitted to the cutting unit  6 A by the transmission mechanism  62 , and the other end WE side of the wire W gripped by the second movable gripping member  70 R and the fixed gripping member  70 C is cut by the operation of the rotary blade portion  61 . 
       FIG. 15  illustrates a state in which the end of the wire W is bent toward the reinforcing bar S side. By moving the movable member  83  further in the forward direction after cutting the wire W, the bending portion  71  moves in the forward direction integrally with the movable member  83 . 
     Specifically, as illustrated in  FIGS. 20B and 20C , the bending portion  71  moves in a direction approaching the reinforcing bar S which is a forward direction indicated by an arrow F, so that the bending portion includes a bending portion  71   a  which is brought into contact with one end WS side of the wire W gripped by the fixed gripping member  70 C and the first movable gripping member  70 L. Further, the bending portion  71  moves in the direction approaching the reinforcing bar S which is the forward direction indicated by the arrow F, so that the bending portion includes a bending portion  71   b  which is brought in contact with the other end WE side of the wire W gripped by the fixed gripping member  70 C and the second movable gripping member  70 R. 
     By moving the bending portion  71  by a predetermined distance in the forward direction indicated by the arrow F, one end WS side of the wire W gripped by the fixed gripping member  70 C and the first movable gripping member  70 L is pressed by the bending portion  71   a  to the reinforcing bar S side and is bent toward the reinforcing bar S side with the gripping position as a fulcrum. 
     As illustrated in  FIGS. 20A and 20B , the gripping unit  70  includes a slip preventing portion  75  (the protrusion portion  70 Lb may also serve as the slip preventing portion  75 ) protruding toward the fixed gripping member  70 C on the distal end side of the first movable gripping member  70 L. One end WS side of the wire W gripped by the fixed gripping member  70 C and the first movable gripping member  70 L is bent toward the reinforcing bar S side with the slip preventing portion  75  as a fulcrum at the gripping position by the fixed gripping member  70 C and the first movable gripping member  70 L by moving the bending portion  71  in the forward direction indicated by the arrow F. In  FIG. 20B , the second movable gripping member  70 R is not illustrated. 
     Further, by moving the bending portion  71  by a predetermined distance in the forward direction indicated by the arrow F, the other end WE side of the wire W gripped by the fixed gripping member  70 C and the second movable gripping member  70 R is pressed to the reinforcing bar S side by the bending portion  71   b  and is bent toward the reinforcing bar S side with the gripping position as a fulcrum. 
     As illustrated in  FIGS. 20A and 20C , the gripping unit  70  is provided with a slip preventing portion  76  protruding toward the fixed gripping member  70 C at the distal end side of the second movable gripping member  70 R. The bending portion  71  is moved in the forward direction indicated by the arrow F, so that the other end WE side of the wire W gripped by the fixed gripping member  70 C and the second movable gripping member  70 R is bent toward the reinforcing bar S side at the gripping position by the fixed gripping member  70 C and the second movable gripping member  70 R with the slip preventing portion  76  as a fulcrum. In  FIG. 20C , the first movable gripping member  70 L is not illustrated. 
       FIG. 16  illustrates a state in which the wire W is twisted. After the end of the wire W is bent toward the reinforcing bar S side, the motor  80  is further driven in the normal rotation direction, whereby the motor  80  further moves the movable member  83  in the direction of the arrow F which is the forward direction. When the movable member  83  moves to a predetermined position in the direction of the arrow F, the movable member  83  comes off from the locking of the rotation restricting member  84 , and the regulation of rotation by the rotation restricting member  84  of the movable member  83  is released. As a result, the motor  80  is further driven in the normal rotation direction, whereby the gripping unit  70  gripping the wire W rotates and twists the wire W. The gripping unit  70  is biased backward by a spring (not illustrated), and twists the wire W while applying tension thereon. Therefore, the wire W is not loosened, and the reinforcing bar S is bound with the wire W. 
       FIG. 17  illustrates a state where the twisted wire W is released. After the wire W is twisted, the motor  80  is driven in the reverse rotation direction, so that the motor  80  moves the movable member  83  in the backward direction indicated by the arrow R. That is, in the movable member  83 , the rotation operation interlocked with the rotation of the motor  80  is restricted by the rotation restricting member  84 , and the rotation of the motor  80  is converted into a linear movement. As a result, the movable member  83  moves in the backward direction. In conjunction with the operation of the movable member  83  moving in the backward direction, the first movable gripping member  70 L and the second movable gripping member  70 R are displaced in a direction away from the fixed gripping member  70 C, and the gripping unit  70  releases the wire W. When the binding of the reinforcing bar S is completed and the reinforcing bar S is pulled out from the reinforcing bar binding machine  1 A, conventionally, the reinforcing bar S may be caught by the guide unit and it may be difficult to remove, which deteriorates workability in some cases. On the other hand, by configuring the movable guide unit  55  of the second guide unit  51  to be rotatable in the arrow H direction, when the reinforcing bar S is pulled out from the reinforcing bar binding machine  1 A, the movable guide unit  55  of the second guide unit  51  does not catch the reinforcing bar S, and thus workability is improved. 
     Example of Action and Effect of Reinforcing Bar Binding Machine of this Embodiment 
     In the reinforcing bar binding machine in which the wires are fed and wound around the reinforcing bar, and then twisted to bind the reinforcing bar, the looped wire is difficult to spread in the radial direction of the loop, so that the guide constituting the feed path used to wind the wire around the reinforcing bar is movable. 
     Meanwhile, in the reinforcing bar binding machine having the configuration in which after the wires are fed in the forward direction and wound around the reinforcing bar, the wires are fed in the backward direction and cut by being wound around the reinforcing bar, and a position at which one end side and the other end side of the wire intersect with each other is twisted to bind the reinforcing bar, the feeding of the wire is temporarily stopped in order to switch the wire feeding direction. 
     When the feeding of the wire is temporarily stopped, a small amount of wire is fed in the forward direction until the feeding of the wire is stopped, and thus the wire wound around the binding objects is displaced in a radial spreading direction. For this reason, the guide constituting the feed path for winding the wire around the reinforcing bar is fixed in the reinforcing bar binding machine according to the related art. Therefore, the reinforcing bar is caught by the guide unit and is hardly pulled out, so workability was bad. 
       FIGS. 21A and 21B  are examples of and the operational effects of the reinforcing bar binding machine of the present embodiment. Hereinbelow, examples of the operational effects of the reinforcing bar binding machine of this embodiment with respect to the operation of inserting the reinforcing bars into the curl guide unit and the operation of pulling the reinforcing bar from the curl guide unit will be described. For example, in the case of binding the reinforcing bars S constituting the base with the wire W, in the work using the reinforcing bar binding machine  1 A, the opening between the first guide unit  50  and the second guide unit  51  of the curl guide unit  5 A faces downward. 
     When performing a binding operation, the opening between the first guide unit  50  and the second guide unit  51  is directed downward, and the reinforcing bar binding machine  1 A is moved downward as indicated by an arrow Z 1  as illustrated in  FIG. 21A , the reinforcing bar S enters the opening between the first guide unit  50  and the second guide unit  51 . 
     When the binding operation is completed and the reinforcing bar binding machine  1 A is moved in the lateral direction indicated by the arrow Z 2  as illustrated in  FIG. 21B , the second guide unit  51  is pressed against the reinforcing bar S bound by the wire W, and the movable guide unit  55  on the distal end side of the second guide unit  51  rotates in the direction of the arrow H around the shaft  55   b  as a fulcrum. 
     Therefore, every time the wire W is bound to the reinforcing bar S, the binding work can be performed successively only by moving the reinforcing bar binding machine  1 A in the lateral direction without lifting the reinforcing bar binding machine  1 A every time. Therefore, (since it is sufficient to simply move the reinforcing bar binding machine  1 A in the lateral direction as compared with moving the reinforcing bar binding machine  1 A once upward and moving it downward) it is possible to reduce restrictions on the moving direction and the movement amount of the reinforcing bar binding machine  1 A in the operation of pulling out the reinforcing bar S bound to the wire W, thereby improving working efficiency. 
     In addition, as illustrated in  FIG. 19B , the fixed guide unit  54  of the second guide unit  51  is fixed without being displaced and capable of restricting the position in the radial direction of the wire W by the binding operation described above. Accordingly, in the operation of winding the wire W around the reinforcing bar S, the position in the radial direction of the wire W can be restricted by the wall surface  54   a  of the fixed guide unit  54 , and the displacement in the radial direction of the wire W guided by the gripping unit  70 , thereby suppressing occurrence of grasping failure. As described above, the reinforcing bar binding machine according to the related art in which the wires are wound around the reinforcing bar, and then twisted to bind the reinforcing bar has a configuration in which the looped wire is difficult to spread in the radial direction of the loop because there is no feeding for pulling back the wire and there is no operation of temporarily stopping the feeding of the wire and inverting the feeding direction. For this reason, a guide corresponding to the fixed guide unit of the present embodiment is unnecessary. However, even in such a reinforcing bar binding machine, when the fixed guide unit and the movable guide unit of the invention are applied, it is possible to suppress the radial expansion of the loop of the wire wound around the reinforcing bar. 
       FIG. 22A  illustrates an example of the operational effect of the reinforcing bar binding machine of this embodiment, and  FIG. 22B  illustrates an example of an operation and a problem of the conventional reinforcing bar binding machine. Hereinbelow, an example of the operational effect of the reinforcing bar binding machine of the present embodiment as compared with the conventional one on the form of the wire W binding the reinforcing bar S will be described. 
     As illustrated in  FIG. 22B , one end WS and the other end WE of the wire W are oriented in the opposite direction to the reinforcing bar S in the wire W bound to the reinforcing bar S in the conventional reinforcing bar binding machine. Therefore, one end WS and the other end WE of the wire W, which are the distal end side of the twisted portion of the wire W binding the reinforcing bar S largely protrude from the reinforcing bar S. If the distal end side of the wire W protrudes largely, there is a possibility that the protruding portion interferes with the operation and hinders work. 
     Also, after the reinforcing bars S are bound, the concrete  200  is poured into the place where the reinforcing bars S are laid. At this time, in order to prevent the one end WS and the other end WE of the wire W from protruding from the concrete  200 , the thickness from the tip of the wire W bound to the reinforcing bar S, in the example of  FIG. 22B , the thickness from the one end WS of the wire W to the surface  201  of the concrete  200  that has been poured is necessarily kept at a predetermined dimension S 1 . Therefore, in a configuration in which the one end WS and the other end WE of the wire W face the direction opposite to the reinforcing bar S, the thickness S 12  from the laying position of the reinforcing bar S to the surface  201  of the concrete  200  becomes thick. 
     On the other hand, in the reinforcing bar binding machine  1 A of the present embodiment, the wire W is bent by the bending portion  71  such that one end WS of the wire W wound around the reinforcing bar S is located closer to the reinforcing bar S than the first bent portion WS 1  which is a bent portion of the wire W, and the other end WE of the wire W wound around the reinforcing bar S is located closer to the reinforcing bar S than the second bent portion WE 1  which is a bent portion of the wire W. In the reinforcing bar binding machine  1 A of the present embodiment, the wire W is bent by the bending portion  71  such that one of the bent portion bent by the preliminary bending portion  72  in the operation of gripping the wire W by the first movable gripping member  70 L and the fixed gripping member  70 C and the bent portion bent by the fixed gripping member  70 C and the second movable gripping member  70 R in the operation of binding the wire W around the reinforcing bar S becomes the top portion which is most protruding portion in the direction away from the reinforcing bar S of the wire W. 
     As a result, as illustrated in  FIG. 22A , the wire W bound to the reinforcing bar S in the reinforcing bar binding machine  1 A according to the present embodiment has the first bent portion WS 1  between the twisted portion WT and one end WS, and one end WS side of the wire W is bent toward the reinforcing bar S side so that one end WS of the wire W is located closer to the reinforcing bar S than the first bent portion WS 1 . The second bent portion WE 1  is formed between the twisted portion WT and the other end WE of the wire W. The other end WE side of the wire W is bent toward the reinforcing bar S side so that the other end WE of the wire W is located closer to the reinforcing bar S side than the second bent portion WE 1 . 
     In the example illustrated in  FIG. 22A , two bent portions, in this example, the first bent portion WS 1  and the second bent portion WE 1 , are formed on the wire W. Of the two, in the wire W bound to the reinforcing bar S, the first bent portion WS 1  protruding most in the direction away from the reinforcing bar S (the direction opposite to the reinforcing bar S) is the top portion Wp. Both of the one end WS and the other end WE of the wire W are bent so as not to protrude beyond the top portion Wp in the direction opposite to the reinforcing bar S. 
     In this manner, by setting one end WS and the other end WE of the wire W so as not to protrude beyond the top portion Wp constituted by the bent portion of the wire W in the direction opposite to the reinforcing bar S, it is possible to suppress a decrease in workability due to the protrusion of the end of the wire W. Since one end WS side of the wire W is bent toward the reinforcing bar S and the other end WE side of the wire W is bent toward the reinforcing bar S side, the amount of protrusion on the distal end side from the twisted portion WT of the wire W is less than the conventional case. Therefore, the thickness S 2  from the laying position of the reinforcing bar S to the surface  201  of the concrete  200  can be made thinner than the conventional one. Therefore, it is possible to reduce the amount of concrete to be used. 
     In the reinforcing bar binding machine  1 A of the present embodiment, the wire W is wound around the reinforcing bar S by feeding in the forward direction, and one end WS side of the wire W wound around the reinforcing bar S by feeding the wire W in the opposite direction is bent toward the reinforcing bar S side by the bending portion  71  in a state of being gripped by the fixed gripping member  70 C and the first movable gripping member  70 L. Further, the other end WE side of the wire W cut by the cutting unit  6 A is bent toward the reinforcing bar S side by the bending portion  71  in a state of being gripped by the fixed gripping member  70 C and the second movable gripping member  70 R. 
     As a result, as illustrated in  FIG. 20B , the gripping position by the fixed gripping member  70 C and the first movable gripping member  70 L is taken as a fulcrum  71   c   1 , and as illustrated in  FIG. 20C , the gripping position by the fixed gripping member  70 C and the second movable gripping member  70 R is taken as a fulcrum  71   c   2 , the wire W can be bent. In addition, the bending portion  71  can apply a force that presses the wire W in the direction of the reinforcing bar S by displacement in a direction approaching the reinforcing bar S. 
     As described above, in the reinforcing bar binding machine  1 A of the present embodiment, since the wire W is gripped securely at the gripping position and the wire W is bent with the fulcrums  71   c   1  and  71   c   2 , it is possible that the force pressing the wire W is reliably applied to a desired direction (the reinforcing bar S side) without being dispersed to the other direction, thereby reliably bending the ends WS and WE sides of the wire W the desired direction (the reinforcing bar S side). 
     On the other hand, for example, in the conventional binding machine that applies a force in a direction in which the wire W is twisted in a state where the wire W is not gripped, the end of the wire W can be bent in a direction that twists the wire W, but a force to bend the wire W is applied in the state where the wire W is not gripped, so that the direction of bending the wire W is not fixed and the end of the wire W may face outward opposite to the reinforcing bar S in some cases. 
     However, in the present embodiment, as described above, since the wire W is firmly gripped at the gripping position and the wire W is bent with the fulcrums  71   c   1  and  71   c   2 , the ends WS and WE sides of the wire W can reliably be directed to the reinforcing bar S side. 
     Further, if the end of the wire W is to be bent toward the reinforcing bar S side after twisting the wire W to bind the reinforcing bar S, there is a possibility that the binding position where the wire W is twisted is loosened and the binding strength decreases. Furthermore, when twisting the wire W to bind the reinforcing bar S and then trying to bend the wire end by applying a force in a direction in which the wire W is twisted further, there is a possibility that the binding place where the wire W is twisted is damaged. 
     On the other hand, in the present embodiment, one end WS side and the other end WE side of the wire W are bent toward the reinforcing bar S side before twisting the wire W to bind the reinforcing bar S, so that the binding place where the wire W is twisted does not become loosened and the binding strength does not decrease. Also, after twisting the wire W to bind the reinforcing bar S, no force is applied in the direction of twisting the wire W, so that the binding place where the wire W is twisted is not damaged. 
       FIGS. 23A and 24A  show examples of operational effects of the reinforcing bar binding machine according to the present embodiment, and  FIGS. 23B and 24B  show examples of the operations and problems of the conventional reinforcing bar binding machine. Hereinbelow, an example of the operational effect of the reinforcing bar binding machine according to the present embodiment as compared with the conventional one will be described in terms of prevention of the wire W coming out from the gripping unit in the operation of winding the wire W around the reinforcing bar S. 
     As illustrated in  FIG. 23B , the conventional gripping unit  700  of the reinforcing bar binding machine includes a fixed gripping member  700 C, a first movable gripping member  700 L, and a second movable gripping member  700 R, and a length restricting unit  701  against which the wire W wound around the reinforcing bar S abuts is provided in the first movable gripping member  700 L. 
     In the operation of feeding the wire W in the backward direction (pulling back) and winding it around the reinforcing bar S and the operation of twisting the wire W by the gripping unit  700 , the wire W gripped by the fixed gripping member  700 C and the first movable gripping member  700 L is likely to come off when the distance N 2  from the gripping position of the wire W by the fixed gripping member  700 C and the first movable gripping member  700 L to the length restricting unit  701  is short. 
     In order to make it difficult for the gripped wire W to come off, it is simply necessary to lengthen the distance N 2 . However, for this purpose, it is necessary to lengthen the distance from the gripping position of the wire W in the first movable gripping member  700 L to the length restricting unit  701 . 
     However, if the distance from the gripping position of the wire W in the first movable gripping member  700 L to the length restricting unit  701  is increased, the size of the first movable gripping member  700 L is increased. Therefore, in the conventional configuration, it is not possible to lengthen the distance N 2  from the gripping position of the wire W by the fixed gripping member  700 C and the first movable gripping member  700 L to one end WS of the wire W. 
     On the other hand, as illustrated in  FIG. 23A , in the gripping unit  70  of the present embodiment, the length restricting unit  74  where the wire W abuts is set to be a separate component independent from the first movable gripping member  70 L. 
     This makes it possible to lengthen the distance NI from the gripping position of the wire W in the first movable gripping member  70 L to the length restricting unit  74  without increasing the size of the first movable gripping member  70 L. 
     Therefore, even if the first movable gripping member  70 L is not enlarged, it is possible to prevent the wire W gripped by the fixed gripping member  70 C and the first movable gripping member  70 L from coming off during the operation of feeding the wire W in the backward direction to wind around the reinforcing bar S and the operation of twisting the wire W by the gripping unit  70 . 
     As illustrated in  FIG. 24B , the conventional gripping unit  700  of the reinforcing bar binding machine is provided with, on the surface of the first movable gripping member  700 L facing the fixed gripping member  700 C, a protrusion protruding toward the fixed gripping member  700 C and a recess into which the fixed gripping member  700 C is inserted, thereby forming a preliminary bending portion  702 . 
     As a result, in the operation of gripping the wire W by the first movable gripping member  700 L and the fixed gripping member  700 C, one end WS side of the wire W protruding from the gripping position by the first movable gripping member  700 L and the fixed gripping member  700 C is bent, and in the operation of feeding the wire W in the backward direction to wind around the reinforcing bar S and the operation of twisting the wire W by the gripping unit  700 , the effect of preventing the wire W from coming off can be obtained. 
     However, since one end WS side of the wire W is bent inward toward the wire W passing between the fixed gripping member  700 C and the second movable gripping member  700 R, the bent one end WS side of the wire W may be caught in contact with the wire W to be fed in the backward direction for winding around the reinforcing bar S. 
     When the bent one end WS side of the wire W is caught by the wire W that is fed in the backward direction for winding around the reinforcing bar S, there is a possibility that the winding of the wire W becomes insufficient or the twisting of the wire W is insufficient. 
     On the other hand, in the gripping unit  70  of the present embodiment, as illustrated in  FIG. 24A , on the surface facing the first movable gripping member  70 L of the fixed gripping member  70 C, a protrusion protruding toward the first movable gripping member  70 L and a recess into which the first movable gripping member  70 L is inserted are provided to form the preliminary bending portion  72 . 
     Therefore, in the operation of gripping the wire W by the first movable gripping member  70 L and the fixed gripping member  70 C, one end WS side of the wire W protruding from the gripping position by the first movable gripping member  70 L and the fixed gripping member  70 C is bent, and in the operation of feeding the wire W in the backward direction to wind around the reinforcing bar S, and the operation of twisting the wire W by the gripping unit  70 , the effect of preventing the wire W from coming off can be obtained. 
     One end WS side of the wire W is bent to the outside opposite to the wire W passing between the fixed gripping member  70 C and the second movable gripping member  70 R, so that it is suppressed that the bent one end WS side of the wire W is in contact with the wire W fed in the backward direction to wind around the reinforcing bar S. 
     Thus, in the operation of feeding the wire W in the backward direction to wind around the reinforcing bar S, it is prevented that the wire W comes off from the gripping unit  70 , thereby surely winding the wire W, and in the operation of twisting the wire W, it is possible to reliably perform the binding of the wire W. 
       FIGS. 25A, 25B, and 26A  show examples of operational effects of the reinforcing bar binding machine of the present embodiment, and  FIGS. 25C, 25D, and 26B  are examples of the operation and problems of the conventional reinforcing bar binding machine. Hereinbelow, an example of the operational effects of the reinforcing bar binding machine according to the present embodiment as compared with the related art will be described with respect to the operation of binding the reinforcing bar S with the wire W. 
     As illustrated in  FIG. 25C , in the conventional configuration in which one wire Wb having a predetermined diameter (for example, about 1.6 mm to 2.5 mm) is wound around the reinforcing bar S, as illustrated in  FIG. 25D , since the rigidity of the wire Wb is high, unless the wire Wb is wound around the reinforcing bar S with a sufficiently large force, slack J occurs during the operation of winding the wire Wb, and a gap is generated between the wire and the reinforcing bar S. 
     On the other hand, as illustrated in  FIG. 25A , in the present embodiment in which two wires W having a small diameter (for example, about 0.5 mm to 1.5 mm) are wound around the reinforcing bar S as compared with the conventional case, as illustrated in  FIG. 25B , since the rigidity of the wire W is lower than that of the conventional wire, even if the wire W is wound around the reinforcing bar S with a lower force than the conventional case, slack in the wire W occurring during the operation of winding the wire W is suppressed, and the wire is surely wound around the reinforcing bar S at the linear portion K. Considering the function of binding the reinforcing bar S with the wire W, the rigidity of the wire W varies not only by the diameter of the wire W but also by the material thereof etc. For example, in the present embodiment, the wire W having a diameter of about 0.5 mm to 1.5 mm is described as an example. However, if the material of the wire W is also taken into consideration, between the lower limit value and the upper limit value of the diameter of the wire W, at least a difference of about tolerance may occur. 
     Further, as illustrated in  FIG. 26B , in the conventional configuration in which one wire Wb having a predetermined diameter is wound around the reinforcing bar S and twisted, since the rigidity of the wire Wb is high, even in the operation of twisting the wire Wb, the slack of the wire Wb is not eliminated, and a gap L is generated between the wire and the reinforcing bar S. 
     On the other hand, as illustrated in  FIG. 26A , in the present embodiment in which two wires W having a smaller diameter are wound around the reinforcing bar S and twisted as compared with the related art, the rigidity of the wire W is lower as compared with the conventional one, by the operation of twisting the wire W, the gap M between the reinforcing bar S and the wire can be suppressed small as compared with the conventional case, whereby the binding strength of the wire W is improved. 
     By using the two wires W, it is possible to equalize the reinforcing bar holding force as compared with the conventional case, and to suppress the deviation between the reinforcing bars S after the binding. In the present embodiment, two wires W are simultaneously (together) fed, and the reinforcing bars S are bound using the two wires W fed simultaneously (together). Feeding the two wires W at the same time means that when one wire W and the other wire W are fed at substantially the same speed, that is, when the relative speed of the other wire W to one wire W is substantially 0. In this example, the meaning is not necessarily limited to this meaning. For example, even when one wire W and the other wire W are fed at different speeds (timings), the two wires W are arranged in parallel with each other and advance in parallel in the feed path of the wire W, so, as long as the wire W is set to be wound around the reinforcing bar S in the parallel state, it means that two wires are fed at the same time. In other words, the total area of the cross-sectional area of each of the two wires W is a factor determining the reinforcing bar holding force, so even if the timings of feeding the two wires W are deviated, in terms of securing the reinforcing bar holding force, the same result can be obtained. However, compared to the operation of shifting the timing of feeding the two wires W, since it is possible to shorten the time required for feeding for the operation of simultaneously (together) feeding the two wires W, it is preferable to feed the two wires W simultaneously (together), resulting in improvement of the binding speed. 
     Modified Example of Reinforcing Bar Binding Machine in this Embodiment 
       FIGS. 27A and 27B  are configuration diagrams illustrating modified examples of the second guide unit of the present embodiment. The displacement direction of the movable guide unit  55  of the second guide unit  51  is restricted by the guide shaft  55   c  and the guide groove  55   d  along the displacement direction of the movable guide unit  55 . For example, as illustrated in  FIG. 27A , the movable guide unit  55  includes the guide groove  55   d  extending along the direction in which the movable guide unit  55  moves with respect to the first guide unit  50 , that is, the direction in which the movable guide unit  55  moves closer to and away from the first guide unit  50 . The fixed guide unit  54  includes the guide shaft  55   c  which is inserted into the guide groove  55   d  and is movable in the guide groove  55   d.  Consequently, the movable guide unit  55  is displaced from the guide position to the retreat position by the parallel movement in the direction in which the movable guide unit  55  comes into contact with and separates from the first guide unit  50  (up and down direction in  FIG. 27A ). 
     Further, as illustrated in  FIG. 27B , a guide groove  55   d  extending in the forward and backward direction may be provided in the movable guide unit  55 . As a result, the movable guide unit  55  is displaced from the guide position to the retreat position by movement in the forward and backward direction in which protruding from the front end, which is one end of the main body  10 A, and retracting to the inside of the main body  10 A are performed. The guide position in this case is a position where the movable guide unit  55  protrudes from the front end of the main body  10 A so that the wall surface  55   a  of the movable guide unit  55  exists at a position where the wire W forming the loop Ru passes. The retreat position is a state in which all or a part of the movable guide unit  55  has entered the inside of the main body  10 A. Further, a configuration may be adopted in which the movable guide unit  55  is provided with a guide groove  55   d  extending in an oblique direction along the direction of contacting and separating from the first guide unit  50  and in the forward and backward direction. The guide groove  55   d  may be a straight line shape or a curved line shape such as a circular arc. 
     As another modified example of the reinforcing bar binding machine  1  A of the present embodiment, the configuration is described in which two wires W are used, but the reinforcing bar S may be bound with one wire W or two or more wires W. In the reinforcing bar binding machine  1 A according to the present embodiment, the length restricting portion  74  is provided in the first guide unit  50  of the curl guide unit  5 A, but may be provided in the first movable gripping member  70 L or the like, or another location, as long as it is a component independent of the gripping unit  70 , for example, a structure that supports the gripping unit  70 . 
     Further, before the operation of bending the one end WS side and the other end WE side of the wire W toward the reinforcing bar S side by the bending portion  71  is completed, the rotation operation of the gripping unit  70  is started, and thus the operation of twisting the wire W may be started. Further, after starting the operation of twisting the wire W by starting the rotation operation of the gripping unit  70 , before the operation of twisting the wire W is completed, the operation of bending the one end WS side and the other end WE side toward the reinforcing bar S side by the bending portion  71  may be started and ended. 
     In addition, although the bending portion  71  is formed integrally with the movable member  83  as a bending unit, the gripping unit  70  and the bending portion  71  may be driven by an independent driving unit such as a motor. Further, instead of the bending portion  71 , as a bending unit, a bending portion formed in a concave-convex shape, or the like may be provided in any of the fixed gripping member  70 C, the first movable gripping member  70 L, and the second movable gripping member  70 R to apply a bending force by which the wire W is bent toward the reinforcing bar S in the operation of gripping the wire W. 
       FIGS. 28A, 28B, 28C, 28D, and 28E  are configuration diagrams illustrating modified examples of the parallel guide of the present embodiment. In the parallel guide  4 B illustrated in  FIG. 28A , the cross-sectional shape of the opening  4 BW, that is, the cross-sectional shape of the opening  4 BW in a direction orthogonal to the feeding direction of the wire W is formed in a rectangular shape, and the longitudinal direction and the lateral direction of the opening  4 BW are formed in a straight shape. In the parallel guide  4 B, the length L 1  in the longitudinal direction of the opening  4 BW is slightly longer than the diameter r of a plurality of the wires W in a form in which the wires W are arranged in parallel along the radial direction, and the length L 2  in the lateral direction is slightly longer than the diameter r of one wire W. In the parallel guide  413  in this example, the length L 1  of the opening  4 BW in the longitudinal direction is slightly longer than the diameter r of two wires W. 
     In the parallel guide  4 C illustrated in  FIG. 28B , the longitudinal direction of the opening  4 CW is formed in a straight shape and the lateral direction is formed in a triangular shape. In the parallel guide  4 C, in order that a plurality of wires W are arranged in parallel in the longitudinal direction of the opening  4 CW and the wire W can be guided by the inclined plane in the lateral direction, the longitudinal length L 1  of the opening  4 CW is slightly longer than the diameter r of the plurality of the wires W in the form in which the wires W are arranged along the radial direction, and the lateral length L 2  is slightly longer than the diameter r of one wire W. 
     In the parallel guide  4 D illustrated in  FIG. 28C , the longitudinal direction of the opening  4 DW is formed in a curved shape which is curved inward in a convex shape and the lateral direction is formed in a circular arc shape. That is, the opening shape of the opening  4 DW is formed in a shape that conforms to the outer shape of the parallel wires W. In the parallel guide  4 D, the length L 1  in the longitudinal direction of the opening  4 DW is slightly longer than the diameter r of the plurality of the wires W in the form in which the wires W are arranged along the radial direction, the length L 2  in the lateral direction is slightly longer than the diameter r of one wire W. In the parallel guide  4 D, in the present example, the length L 1  in the longitudinal direction has a length slightly longer than the diameter r of two wires W. 
     In the parallel guide  4 E illustrated in  FIG. 28D , the longitudinal direction of the opening  4 EW is formed in a curved shape curved outward in a convex shape, and the lateral side direction is formed in a circular arc shape. That is, the opening shape of the opening  4 EW is formed in an elliptical shape. The parallel guide  4 E has a length L 1  in the longitudinal direction of the opening  4 EW which is slightly longer than the diameter r of the plurality of wires W in a form in which the wires W are arranged along the radial direction, and a length L 2  in the lateral direction is slightly longer than the diameter r of one wire W. In this example, the parallel guide  4 E has a length L 1  in the longitudinal direction slightly longer than the diameter r of two wires W. 
     The parallel guide  4 F illustrated in  FIG. 28E  includes a plurality of openings  4 FW matching the number of wires W. Each wire W is passed through another opening  4 FW one by one. In the parallel guide  4 F, each opening  4 FW has a diameter (length) L 1  slightly longer than the diameter r of the wire W, and by the direction in which the openings  4 FW are arranged, the direction in which a plurality of wires W are arranged in parallel is restricted. 
       FIG. 29  is a configuration diagram illustrating a modified example of the guide groove of this embodiment. The guide groove  52 B has a width (length) L 1  and a depth L 2  slightly longer than the diameter r of the wire W. Between one guide groove  52 B through which one wire W passes and the other guide groove  52 B through which the other wire W passes, a section wall portion is formed along the feeding direction of the wire W. The first guide unit  50  restricts the direction in which a plurality of wires are arranged in parallel with each other by the direction in which the plurality of guide grooves  52 B are arranged. 
       FIGS. 30A and 30B  are configuration diagrams illustrating modified examples of the wire feeding unit according to the present embodiment. The wire feeding unit  3 B illustrated in  FIG. 32A  includes a first wire feeding unit  35   a  and a second wire feeding unit  35   b  that feed the wire W one by one. The first wire feeding unit  35   a  and the second wire feeding unit  35   b  are provided with a first feed gear  30 L and a second feed gear  30 R, respectively. 
     Each wire W fed one by one by the first wire feeding unit  35   a  and the second wire feeding unit  35   b  is arranged in parallel in a predetermined direction by the parallel guide  4 A illustrated in  FIGS. 4A, 4B , or  4 C, or the parallel guide  4 B to  4 E illustrated in  FIGS. 28A, 28B, 28C , or  28 D, and the guide groove  52  illustrated in  FIG. 5 . 
     The wire feeding unit  3 C illustrated in  FIG. 30B  includes a first wire feeding unit  35   a  and a second wire feeding unit  35   b  that feed the wire W one by one. The first wire feeding unit  35   a  and the second wire feeding unit  35   b  are provided with a first feed gear  30 L and a second feed gear  30 R, respectively. 
     Each of the wires W sent one by one by the first wire feeding unit  35   a  and the second wire feeding unit  35   b  is arranged in parallel in a predetermined direction by the parallel guide  4 F illustrated in  FIG. 28E  and the guide groove  52 B illustrated in  FIG. 29B . In the wire feeding unit  30 C, since the two wires W are independently guided, if the first wire feeding unit  35   a  and the second wire feeding unit  35   b  can be independently driven, it is also possible to shift the timing to feed the two wires W. Even if the operation of winding the reinforcing bar S is performed by starting the feeding of the other wire W from the middle of the operation of winding the reinforcing bar S with one of the two wires W, the two wires W are regarded to be fed at the same time. Also, although feeding of two wires W is started at the same time, when the feeding speed of one wire W is different from the feeding speed of the other wire W, the two wires W are regarded to be simultaneously (together), fed as well. 
       FIG. 31  is a view illustrating an example of a second guide unit according to another embodiment. The second guide unit  51 B includes a base guide unit  54 B a serving as a third guide unit for restricting the radial position of the loop Ru 2  formed by the wire W fed from the first guide unit  50  and a movable guide unit  55  serving as a fourth guide unit for restricting the position along the axial direction Ru 1  of the loop Ru. 
     The base guide unit  54 B restricts the position of radial direction Ru 2  of the loop Ru formed by the wire W, by the wall surface Ma provided outside the radial direction Ru 2  of the loop Ru formed by the wire W. 
     The movable guide unit  55  includes a wall surface  55   a  that is provided on the distal end of the second guide unit  51 B, and the wall surface  55   a  is formed on both sides along the axial direction Ru 1  of the loop Ru formed by the wire W sent from the first guide unit  50 . Thus, the position of the axial direction Ru 1  of the loop Ru formed by the wire WI is restricted by the wall surface  55   a  of the movable guide unit  55 , and the wire W is guided to the base guide unit  54 B by the movable guide unit  55 . 
     The movable guide unit  55  is supported on the base guide unit  54 B by a shaft  55   b  rotating along the axial direction Rul of the loop Ru formed by the wire W. By a rotation operation of rotating about the shaft  55   b  as a fulcrum as indicated by arrows H 1  and H 2 , the movable guide unit  55  is opened and closed between a guide position at which the wire sent from the first guide unit  50  can be guided to the second guide unit  51 B and a retreat position at which the reinforcing bar binding machine  1 A is retreated by being pulled out from the reinforcing bar S. 
     The movable guide unit  55  is urged in a direction indicated by an arrow H 2  in which the distance between the distal end side of the first guide unit  50  and the distal end side of the second guide unit  51 B approaches by the urging portion such as a torsion coil spring  57 , and is held in the guide position illustrated in  FIG. 21A  by the force of the torsion coil spring  57 . In addition, when the movable guide unit  55  is pushed to the reinforcing bar S by the operation of pulling out the reinforcing bar binding machine  1 A from the reinforcing bar S, the movable guide unit  55  rotates in a direction indicated by an arrow H 1  and is opened from the guide position to the retreat position illustrated in  FIG. 21B . 
     The second guide unit  51 B includes a retraction mechanism (rotation mechanism)  54 C by which the base guide unit  54 B is displaced and retreated in a direction separating from the first guide unit  50 . The retraction mechanism MC includes a shaft  58  that supports the base guide unit  54 B and a spring  59  that holds the base guide unit  54 B at a predetermined guide position. 
     The base guide unit  54 B is supported so as to be displaceable in a direction indicated by arrows Q 1  and Q 2  by an operation of rotating about the shaft  58  as a fulcrum. The spring  59  is an example of an urging portion (urging portion), and is configured with a torsion coil spring, for example. The spring  59  has a larger spring load than the torsion coil spring  57 . The base guide unit  54 B is held at the guide position illustrated in  FIG. 31 , by the spring  59 . 
       FIGS. 32 to 35  are explanatory views illustrating an example of an operation of the second guide unit according to another embodiment. The wire W shaped in a circular arc shape by the first guide unit  50  of the curl guide unit  5 A is wound such that position of two outside points and one inside point of the circular arc are restricted at three points of a fixed blade portion  60  constituting the parallel guide  4 A at a cutting and discharging position P 3  and the guide pins  53  and  53   b  of the first guide unit  50 , thereby forming a substantially circular loop Ru. 
     Thus, as illustrated in  FIG. 32 , the distal end of the wire W enters the movable guide unit  55 , the position in the axial direction Rul of the loop Ru formed by the wire W is restricted by the wall surface  55   a  of the movable guide unit  55 , and the wire W is guided to the base guide unit  54 B by the movable guide unit  55 . 
     When the wire W is fed by the wire feeding unit  3 A, as illustrated in  FIG. 33 , the wire W is guided to the base guide unit  54 B by the movable guide unit  55 . Even when the loop Ru formed by the wire W expands outward in the radial direction Ru 2  and the wire W is in contact with the base guide unit  54 B, the base guide unit  54 B is held in the fixed state by the force of the spring  59  at the guide position. 
     When the wire W is further fed, as illustrated in  FIG. 34 , the distal end of the wire W abuts on the length restricting portion  74 . When a predetermined amount of wire W is further fed until the feeding of the wire W is stopped, as illustrated in  FIG. 35 , the position of the distal end of the wire W is restricted by the length restricting portion  74 , and thus the loop Ru formed by the wire W expands outward in the radial direction Rut while the distal end of the wire W moves forward along the length restricting portion  74 . However, the base guide unit  54 B is held in the fixed state by the force of the spring  59  at the guide position. 
     As described above, in the operation of forming the loop Ru with the wire W sent from the first guide unit  50 , even when the wire W abuts on the base guide unit  54 B,the base guide unit  54 B is held in the fixed state at the guide position. 
     Further, even in the case where the movable guide unit  55  is pushed to the reinforcing bar S in the operation of pulling out the reinforcing bar binding machine  1 A from the reinforcing bar S and thus the movable guide unit  55  is opened from the guide position to the retreat position, the base guide unit  54 B is held in the fixed state at the guide position. 
     However, when an unexpected external force is applied, the base guide unit  54 B rotates in the direction indicated by the arrow Q 1  about the shaft  58  as a fulcrum against the urging force of the spring  59 , and thus being released from the external force. When being released from the external force, the base guide unit  54 B is pressed by the spring  59  to rotate in the direction indicated by the arrow Q 2 , and returns to the guide position. 
     Thus, by the retraction mechanism  54 C provided in the base guide unit  54 B, it is possible to reduce the load without hindering the formation of the loop Ru of the wire W wound around the reinforcing bar S in the case where external force or the like is applied. Particularly, as the shaft  55   b  of the movable guide unit  55  and the shaft  58  of the base guide unit  54 B are in parallel with each other, the base guide unit  54 B can be retreated by the large external force applied to the movable guide unit  55 , for example, the force applied to the movable guide  55 . 
     By the configuration in which the movable guide unit  55  is opened in the direction of the arrow H 1  by the force of the hand and the base guide unit  54 B can be opened in the direction of the arrow H 1 , the movable range of the second guide unit  51 B can be increased. This facilitates maintenance or removal of wire jams or the like. The base guide unit  54 B may be retractable by the linear motion described with reference to  FIG. 27 . 
     As another modified example of the present embodiment, instead of the configuration in which a plurality of wires W are simultaneously fed, a configuration may be provided in which wires W are wound around the reinforcing bar S by being fed one by one, a plurality of wires are wound, and then the plurality of wires are wound around the reinforcing bar S by being fed in the reverse direction. 
     Further, a magazine for holding a short wire W may be provided, and a plurality of wires W may be supplied. 
     Further, the magazine may not be provided in the main body, but the wire may be supplied from a supply portion of an independent wire. 
     It is to be noted that the present invention can also be applied to a binding machine that binds pipes or the like as a binding objects with a wire. 
     Some or all of the above embodiments can be described as follows. 
     Additional Note 1-1 
     A binding machine comprising: 
     a housing (magazine) that houses a wire to be capable of feeding the wire; 
     a wire feeding unit that feeds the wire which is capable to be fed from the housing; 
     a curl guide that receives the wire fed from the wire feeding unit and winds around a binding object; and 
     a binding unit that grips and twists the wire wound around the binding object by the curl guide, 
     wherein the curl guide includes: 
     a first guide unit that receives the wire fed by the wire feeding unit, and 
     a second guide unit that receives the wire from the first guide unit, and 
     the second guide unit includes: 
     a third guide unit, and 
     a fourth guide unit which is movable with respect to the third guide unit. 
     Additional Note 1-2 
     The binding machine according to (1-1), wherein the fourth guide unit is rotatably supported by the third guide unit. 
     Additional Note 1-3 
     The binding machine according to (1-1) or (1-2), wherein the third guide unit is provided in a main body. 
     Additional Note 2-1 
     A binding machine comprising: 
     a housing (magazine) that houses a wire to be capable of feeding the wire; 
     a wire feeding unit that feeds the wire which is capable to be fed from the housing; 
     a curl guide that curls the wire fed by the wire feeding unit and winds the wire around the binding object; and 
     a binding unit that grips and twists the wire wound around the binding object by the curl guide 
     wherein the curl guide includes: 
     a first guide unit that curls the wire fed by the wire feeding unit; and 
     a second guide unit that guides the wire curled by the first guide unit to the binding unit, and 
     the second guide unit includes: 
     a third guide unit which restricts movement of the wire in a radial direction of a loop formed by the wire wound around the binding object, and 
     a fourth guide unit which restricts movement of the wire in an axial direction of the loop. 
     Additional Note 2-2 
     The binding machine according to (2-1), wherein the fourth guide unit is rotatably provided with respect to the third guide unit. 
     Additional Note 2-3 
     The binding machine according to (2-2), wherein the fourth guide unit is movable between a guide position at which the movement of the wire is restricted in the axial direction of the loop and a retreat position at which the movement of the wire is not restricted by being retreated from a feed path of the wire by the rotation. 
     Additional Note 2-4 
     The binding machine according to (2-2) or (2-3), wherein the fourth guide unit rotates around a shaft provided in the third guide unit. 
     Additional Note 2-5 
     The binding machine according to any one of (2-2) to (2-4), wherein the fourth guide unit is provided such that the other end is rotatably supported on the third guide unit so as to allow one end side to be movable toward and away from the first guide unit. 
     Additional Note 2-6 
     The binding machine according to any one of (2-1) to (2-5), wherein the third guide unit is rotatably provided in the radial direction of the loop with respect to a binding machine main body 
     the fourth guide unit is rotatably provided in the radial direction of the loop with respect to the third guide unit, and 
     a rotation amount (rotation range) of the fourth guide unit is set to be larger than a rotation amount (rotation range) of the third guide unit. 
     The third guide is movable in a range of restricting the movement of the wire in the radial direction of the loop formed by the wire. 
     Alternatively, the third guide is movable beyond the range of restricting the movement of the wire in the radial direction of the loop formed by the wire. 
     (Additional Note 2-7 
     The binding machine according to any one of (2-1) to (2-6), wherein 
     the third guide unit is rotatably provided in the radial direction of the loop with respect to a binding machine main body, 
     the fourth guide unit is rotatably provided in the radial direction of the loop with respect to the third guide unit, and 
     a pressing force for rotating the fourth guide unit is set to be smaller than a pressing force for rotating the third guide unit. 
     The pressing force for rotating the third guide unit is larger than a force capable of restricting the movement of the wire in the radial direction of the loop formed by the wire. 
     Additional Note 2-8 
     The binding machine according to any one of (2-1) to (2-5), wherein a binding machine main body is provided to support the third guide unit, and 
     the third guide unit is fixed to the binding machine main body. 
     Additional Note 2-9 
     The binding machine according to any one of (2-2) to (2-8), wherein 
     the second guide unit includes a rotation mechanism which rotates the fourth guide unit, 
     the rotation mechanism includes a shaft which supports the fourth guide unit and an urging portion which holds the fourth guide unit at a predetermined position, and 
     the fourth guide unit is movable to the retreat position by rotating against an urging force of the urging portion. 
     Additional Note 2-10 
     The binding machine according to any one of (2-1) to (2-5), wherein 
     a binding machine main body is provided to support the third guide unit, and 
     the third guide unit is provided to linearly move in the binding machine main body. 
     The third guide is movable in a range of restricting the movement of the wire in the radial direction of the loop formed by the wire. 
     Alternatively, the third guide is movable beyond the range of restricting the movement of the wire in the radial direction of the loop formed by the wire. 
     Additional Note 3-1 
     A binding machine including: 
     a binding machine main body; 
     a housing (magazine) that houses a wire to be capable of feeding the wire; 
     a wire feeding unit that feeds the wire which is capable to be fed from the housing; 
     a curl guide that curls the wire fed by the wire feeding unit and winds the wire around the binding object; and 
     a binding unit that grips and twists the wire wound around the binding object by the curl guide, 
     wherein the curl guide includes: 
     a first guide unit that curls the wire fed by the wire feeding unit, and 
     a second guide unit that guides the wire curled by the first guide unit to the binding unit, and 
     the second guide unit is provided so as to be movable between a position at which the second guide unit protrudes toward a binding machine main body and a position at which the second guide unit enters entirely or partially the binding machine main body. 
     The invention is applicable to a reel for a wire used in a reinforcement binding machine. 
     This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2015-145284 filed on Jul. 22, 2015 and Japanese Patent Application No. 2016-136068 filed on Jul. 8, 2016, the entire contents of which are incorporated herein by reference. 
     REFERENCE SIGNS LIST 
     
         
           1 A: reinforcing bar binding machine, 
           2 A: magazine, 
           20 : reel, 
           3 A: wire feeding unit (feeding unit), 
           4 A: parallel guide (feeding unit), 
           5 A: curl guide unit (guide unit (feeding unit)), 
           6 A: cutting unit, 
           7 A: binding portion (binding unit), 
           8 A: binding unit driving mechanism, 
           30 L: first feed gear, 
           30 R: second feed gear, 
           31 L: tooth portion, 
           31 La: tooth bottom circle, 
           32 L: first feed groove, 
           32 La: fast inclined surface, 
           32 Lb: second inclined surface, 
           31 R: tooth portion, 
           31 Ra: tooth bottom circle, 
           32 R: second feed groove, 
           32 Ra: first inclined surface, 
           32 Rb: second inclined surface, 
           33 : driving unit, 
           33   a : feed motor, 
           33   b : transmission mechanism, 
           34 : displacement portion, 
           50 : first guide unit, 
           51 : second guide unit, 
           52 : guide groove (guide unit), 
           53 : guide pin, 
           53   a : retreat mechanism, 
           54 : fixed guide unit (third guide unit), 
           54   a : wall surface, 
           54 B: base guide unit (third guide unit), 
           55 : movable guide unit (fourth guide unit), 
           55   a : wall surface, 
           55   b : shaft, 
           55   c : guide shaft, 
           55   d : guide groove, 
           60 : fixed blade portion, 
           61 : rotary blade portion, 
           61   a : shaft, 
           62 : transmission mechanism, 
           70 : gripping unit, 
           70 C: fixed gripping member, 
           70 L: first movable gripping member, 
           70 R: second movable gripping member, 
           71 : bending portion, 
           80 : motor, 
           81 : reduction gear, 
           82 : rotary shaft, 
           83 : movable member, 
         W: wire