Patent Publication Number: US-9852845-B2

Title: Air core coil fitting apparatus

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an apparatus for manufacturing a coil device installed in a rectifier circuit in AC equipment such as a power circuit or an inverter, a noise suppression circuit, a resonance circuit, and the like, and more specifically relates to an air core coil fitting apparatus for fitting an air core coil onto a core. 
     2. Description of Related Art 
     Coil devices such as choke coils are formed by attaching a wound wire around a core made of a magnetic material. In order to easily attach a wound wire to a core, the core has a gap extending through the core in the radial direction. An air core coil wound in advance is fitted using this gap onto the core (see FIGS. 1 and 2 of JP 2011-135091A, for example), after which the gap is filled with a magnetic or non-magnetic filling member (see FIG. 9 of JP 2011-135091A, for example). 
     The operation that fits air core coils onto cores is manually performed. Since gap dimensions are determined so as to be preferable for magnetic circuit designs such as inductance values or magnetic saturation characteristics, it is not possible to obtain a design that ensures gap dimensions necessary for fitting of coils. Accordingly, in most cases, air core coils have to be fitted through narrow gaps, resulting in problems that the qualities and the numbers of coil devices manufactured vary depending on the skill of operators, i.e., problems such as deformation in which part of the air core coils is tensioned and deformed, friction on the insulating coat surfaces, or variation in the output due to poor efficiency in the fitting operation. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to solve the above-described problems by providing an air core coil fitting apparatus that can automatically fit air core coils onto cores. 
     The present invention is directed to an air core coil fitting apparatus, including: 
     a holding member adopted to hold a core main body that is formed in a ring shape, has a gap extending through the core main body from an inner circumferential face to an outer circumferential face thereof, and allows an air core coil wound in advance to be fitted onto the core main body from one end thereof; 
     a coil fitting rod on which the air core coil that is to be fitted onto the core main body held by the holding member is fitted; 
     a rod driving member adopted to bring a front end of the coil fitting rod close to or into contact with the one end of the core main body held by the holding member; 
     a pushing member adopted to push the air core coil fitted on the coil fitting rod, toward the one end of the core main body, in a state in which the front end of the coil fitting rod is close to or in contact with the one end of the core main body; and 
     a sending member adopted to pull the air core coil pushed by the pushing member and fitted onto the core main body, toward another end of the core main body, the sending member being disposed at a circumferential edge of the core main body held by the holding member. 
     It is possible that the rod driving member swings the coil fitting rod, thereby bringing the front end of the coil fitting rod close to or into contact with the one end of the core main body held by the holding member. 
     It is possible that the rod driving member moves the coil fitting rod in a direction along a longitudinal direction of the coil fitting rod, thereby bringing the front end of the coil fitting rod close to or into contact with the one end of the core main body held by the holding member. 
     It is possible that the sending member is disposed close to an outer circumferential edge of the core main body held by the holding member, and includes a plurality of catch pieces that can project toward and withdraw from the outer circumferential edge and a moving member that moves the catch pieces from the one end to the other end of the core main body. 
     It is possible that the pushing member pushes the air core coil toward the core main body at least to a position facing the plurality of catch pieces, and 
     the sending member has a biasing member adopted to bias the plurality of catch pieces toward the outer circumferential edge, thereby bringing the plurality of catch pieces into contact with the air core coil. 
     It is possible that each of the plurality of catch pieces has a biasing face for biasing the air core coil in contact with the catch piece in a direction along the outer circumference during movement from the one end to the other end of the core main body. 
     It is possible that the moving member has a circular arc member that is disposed close to the outer circumferential edge of the core main body held by the holding member and travels from the one end to the other end of the core main body. 
     It is possible that the coil fitting rod includes, at the front end thereof, an engagement member that can be engaged with the one end of the core main body held by the holding member. 
     It is possible that the core main body includes a core made of a magnetic material and an insulating coating member that coats an outer circumference of the core, and the coating member includes an engagement target member that can be engaged with the engagement member. 
     It is possible that the core main body includes a core made of a magnetic material and an insulating coating member that coats an outer circumference of the core, and the coating member includes a positioning member projecting from an inner circumference at the other end of the core main body, and 
     the holding member includes a chuck for holding the positioning member. 
     It is possible that the core main body includes a core made of a magnetic material and an insulating coating member that coats an outer circumference of the core, and the coating member includes a rotation preventing member projecting from an outer circumference at the other end of the core main body, and 
     the holding member includes a pressing member for biasing the rotation preventing member in an orientation opposite to a fitting direction of the air core coil. 
     It is possible that the core is a dust compact, and the coating member is formed by performing insert-molding with an insulating resin material. 
     The air core coil fitting apparatus of the present invention can automatically fit an air core coil onto a core main body. Furthermore, since the sending member is used, the air core coil can be pulled along the circumferential edge of the core main body, and the air core coil that is being fitted from one end of the core main body is fitted to another end of the core main body without being stuck at the middle of the core main body. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a plan view showing a schematic configuration of an air core coil fitting apparatus according to an embodiment of the present invention. 
         FIG. 2  is a side view showing a schematic configuration of the air core coil fitting apparatus according to the embodiment of the present invention. 
         FIG. 3  is an enlarged plan view of an encircled portion  3  in  FIG. 1 , showing a state in which a core main body and an air core coil are attached. 
         FIG. 4  is a cross-sectional view taken along the line  4 - 4  in  FIG. 3 . 
         FIG. 5  is an enlarged plan view of an encircled portion  5  in  FIG. 1 , showing a state in which the air core coil is attached. 
         FIG. 6  is a cross-sectional view taken along the line  6 - 6  in  FIG. 5 . 
         FIG. 7  is a plan view showing an appearance of the core main body that is to be attached to the air core coil fitting apparatus according to the embodiment of the present invention. 
         FIG. 8  is an explanatory view illustrating a fitting operation of the air core coil and a filling member. 
         FIG. 9  is an explanatory view illustrating a fitting operation of the air core coil and the filling member. 
         FIG. 10  is an explanatory view illustrating a fitting operation of the air core coil and the filling member. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Hereinafter, an air core coil fitting apparatus  10  according to an embodiment of the present invention will be described with reference to the drawings. 
       FIGS. 1 and 2  are a plan view and a side view showing a schematic configuration of the air core coil fitting apparatus  10 .  FIG. 3  is an enlarged plan view of an encircled portion  3  in  FIG. 1 , showing a state in which a core main body  70  and an air core coil  90  are attached. The air core coil fitting apparatus  10  is an apparatus in which the air core coil  90  wound in advance is fitted onto the core main body  70  having a gap  71  as shown in  FIG. 3 , after which a filling member  85  is fitted into the gap  71  (see  FIG. 7 ). 
     As the overall configuration, as shown in  FIGS. 1 to 3 , the air core coil fitting apparatus  10  includes a holding member  20  adopted to hold the core main body  70 , a coil fitting rod  26  on which the air core coil  90  is fitted, a rod driving member  30  adopted to bring a front end of the coil fitting rod  26  close to or into contact with the core main body  70 , a pushing member  40  adopted to push the air core coil  90  toward the core main body  70 , a sending member  50  adopted to pull the air core coil  90  onto the core main body  70 , and a filling member fitting member  60  adopted to fit the filling member  85  into the gap  71 . Note that, in  FIG. 1 , part of the configuration of the holding member  20  is not shown. 
     As shown in  FIG. 7 , the core main body  70  onto which the air core coil  90  is to be fitted by the air core coil fitting apparatus  10  of the present invention has the gap  71  extending through the core main body  70  from the inner circumferential face to the outer circumferential face. The core main body  70  may be formed by coating an outer circumference of a core  72  made of a magnetic material, with an insulating resin  73 .  FIG. 7  is a plan view showing an appearance of the core main body  70  that is to be attached to the air core coil fitting apparatus  10 . 
     Examples of the magnetic substance used in the core  72  include a laminated magnetic core obtained by laminating or winding a thin plate made of silicon steel (hereinafter, referred to as a silicon steel core), a dust compact obtained by pressure-molding a powder such as an iron-based, an iron-silicon-based, an iron-aluminum-silicon-based, an iron-nickel-based, or an iron-based amorphous powder (hereinafter, referred to as a dust core), and an Mn-based ferrite magnetic core or an Ni-based ferrite magnetic core obtained by sintering a magnetic powder mainly made of iron oxide (hereinafter, referred to as a ferrite core). 
     As the core  72 , a dust core made of the above-described various magnetic materials may be preferably used. The dust core is sold and provided in a form obtained by performing high-pressure molding on a powder in a mold using a press molding method, thermally treating the resulting material to ensure desired magnetic characteristics, and coating the surface with epoxy resin or the like using a powder coating method or an application method. These processes are performed in order to provide electric insulation properties and environment-resistant characteristics and to increase the mechanical strength. 
     The resin coating processing is an operation with very poor efficiency because application and drying have to be repeated a plurality of times in order to reliably ensure the film thickness, and, furthermore, the shapes vary due to poor appearance dimensional accuracy in the state of completion, and, thus, it is very difficult to directly arrange an engagement member, a positioning member, and a rotation preventing member on a resin coat. 
     On the other hand, a dust core before coating has high dimensional accuracy in the state of completion because it is manufactured in a mold, and, furthermore, has high degree of freedom in design. For example, the core main body  70  can be obtained by precisely performing insert-molding on a dust core as the core  72 , with insulating resin  73  using an injection molding method, and, thus, it is possible to efficiently mold at a time an engagement member, a positioning member, and a rotation preventing member. 
     It can be assured that the dust core is a magnetic substance more preferable than the silicon steel core or the ferrite core because its change in magnetic characteristics due to an injection pressure applied in the injection molding method is smaller. 
     As shown in  FIG. 7 , examples of the shape of the core main body  70  include a tear-drop shape in which ends on one side of two straight portions are connected substantially at a right angle along a bent portion having a small radius of curvature and ends on the other side are linked to each other along an arc portion having a large radius of curvature. Examples of the shape of the core main body  70  may further include substantially rectangular ring shapes, substantially circular, elliptical, or other ring shapes, and ring shapes obtained by combining these. 
     The cross-section of the core main body  70  preferably has a substantially rectangular shape, a circular shape, or a shape obtained by combining these. 
     The gap  71  formed through the core main body  70  may be formed by cutting the core main body  70  with a grindstone or the like. At that time, if the core main body  70  is insert-molded with insulating resin  73  using an injection molding method, the core  72  and the insulating resin  73  are closely fixed to each other, and, thus, in the case of using a silicon steel core as the core  72 , a burr can be prevented from occurring during cutting, in the case of using a dust core, the molded shape of the dust core can be effectively prevented from being deformed during cutting, and, in the case of using a ferrite core, corner portions and end faces thereof can be prevented from being chipped off. 
     In conventional techniques, a gap is formed regardless of the magnetic substance of the core  72 , and an insulating molded case (not shown) provided with a groove where the gap  71  prepared in advance is open has to be firmly secured and assembled using an adhesive, whereas, in the insert-molding using the injection molding method, a close contact structure can be obtained without an adhesive, and, thus, the processing can be made significantly simple and precise. 
     Furthermore, the filling member  85  is fitted into the gap  71  of the core main body  70 . At the time of fitting, an engagement catch piece  86  of the filling member  85  is engaged with an engagement target member  83  of the core main body  70 , so that the filling member  85  is fixed to the core main body  70 . The engagement target member  83  may be an engagement target catch piece. 
     If the core main body  70  has a straight portion in order to allow the air core coil  90  to be easily fitted, the core main body  70  is preferably formed such that one end face  74  of the gap  71  is continuous to an inner face of the straight portion. Furthermore, if the core main body  70  has, for example, a circular or elliptical ring shape with no straight portion, the core main body  70  is preferably formed such that the end face  74  of the gap  71  conforms to or substantially conforms to a tangent line of an inner face of the core main body  70 . 
     The core main body  70  includes a positioning portion  75  for positioning on the holding member  20 , and a rotation preventing portion  76  for preventing rotation of the core main body  70  while the air core coil  90  is being fitted, both of which will be described later. The positioning portion  75  may be formed as a positioning shaft projecting upward and downward from a projecting piece  77  that is projecting inward from the inner face of the core main body  70 . Furthermore, the rotation preventing portion  76  may be formed as a positioning projecting piece projecting outward from a trailing end  80  that is on the side opposite from an end portion  79  to which the air core coil  90  is fitted. 
     The thus configured core main body  70  is attached to the holding member  20 . As shown in  FIGS. 2 and 4 , the holding member  20  may hold the positioning portion  75  of the core main body  70  from above and below.  FIG. 4  is a cross-sectional view taken along the line  4 - 4  in  FIG. 3 . The holding member  20  is such that the positioning portion  75  is fitted to a lower shaft member  21  projecting from below, and a vertically movable upper shaft member  22  is lowered, so that the positioning portion  75  is held. The lower shaft member  21  is supported on a support base  25 . The upper shaft member  22  can be vertically moved by a cylinder  23 . Accordingly, the upper shaft member  22  and the lower shaft member  21  form a chuck for holding the positioning portion  75 . 
     At that time, the rotation preventing portion  76  is engaged with a rotation preventing member  24  forming the holding member  20 . Examples of the rotation preventing member  24  may include an engagement catch that is disposed away by a predetermined distance from the holding member  20  such that, when the core main body  70  is attached to the holding member  20 , the engagement catch is caught on the rotation preventing portion  76 . The engagement catch (the rotation preventing member  24 ) is formed at a front end of a rotation preventing rod  15 . 
     Furthermore, the sending member  50  adopted to pull the air core coil  90  onto the core main body  70  is disposed at the circumferential edge of the holding member  20 . As shown in  FIG. 3 , the sending member  50  may include a plurality of catch pieces  51  biased by springs toward the core main body  70 . The catch pieces  51  can move back and forth along the circumferential edge of the core main body  70  in a state of being biased by biasing member  54  so as to project toward the air core coil  90  fitted onto the core main body  70 . 
     Each front end of the catch pieces  51  is configured by a biasing face  55  that is substantially perpendicular to the circumferential edge of the air core coil  90  (the core main body  70 ), on the downstream side in the pulling direction of the air core coil  90 , and a contact face  56  that is at an acute angle to the circumferential edge of the air core coil  90  (the core main body  70 ), on the upstream side. 
     Examples of the biasing member  54  include a plunger that has a thread groove on the circumferential face thereof so as to realize stroke adjustment and that can exhibit a spring force, wherein the front end of a piston rod is in contact with the catch piece  51 . The catch pieces  51  and the biasing member  54  are attached to a wire rope  52  disposed at the circumferential edge of the air core coil  90 . The wire rope  52  is a circular arc member and is supported on a rotation base  57 . The rotation base  57  swings about a rotational shaft (not shown) by a wire rope driving member  53  such as a stepping motor. Thus, the wire rope  52  and the catch pieces  51  move back and forth in circumferential directions along the circumferential edge of the air core coil  90  between a sending start position and a sending end position, which will be described later. Accordingly, the wire rope  52 , the rotation base  57 , and the wire rope driving member  53  are configured as a moving member for the catch pieces  51 . 
     Although three catch pieces  51  are arranged in this embodiment, the number of catch pieces  51  is plural and is not particularly limited to three. 
     As shown in  FIG. 8 , when each of the catch pieces  51  moves from the sending start position to the sending end position (in the pulling direction), the biasing face  55  is brought into contact with the air core coil  90  and moves (pulls) the air core coil  90  along the circumferential edge of the core main body  70 . The contact face  56  is in contact with the air core coil  90  pushed by the pushing member  40  when the catch piece  51  has stopped at the sending start position or the like. With this contact, the catch piece  51  is pushed up in a direction away from the air core coil  90  (the core main body  70 ) resisting the biasing force. That is to say, the air core coil  90  passes by the catch pieces  51  while pushing up the catch pieces  51  so as to be fitted onto the core main body  70 , for example, when the catch pieces  51  are stopping. 
     As shown in  FIGS. 5 and 6 , the coil fitting rod  26  on which the air core coil  90  is fitted is an elongated member having a cross-section in the shape of a sideway U.  FIG. 5  is an enlarged plan view of an encircled portion  5  in  FIG. 1 , showing a state in which the air core coil is attached.  FIG. 6  is a cross-sectional view taken along the line  6 - 6  in  FIG. 5 . The coil fitting rod  26  guides movement of the air core coil  90  fitted thereon. Furthermore, the coil fitting rod  26  has a front end portion  27  that can be engaged with the core main body  70  and can form a substantially straight line with the fitting-side end portion  79  of the core main body  70 . The front end portion  27  has an engagement member  28  such as an engagement catch piece that can be engaged with the engagement target member  83  of the fitting-side end portion  79 . 
     As shown in  FIG. 1 , the coil fitting rod  26  has a base end that is supported in plane by a rotational shaft  29 , and the front end portion  27  moves back and forth along an arc locus about the rotational shaft  29  by the rod driving member  30  such as a stepping motor. That is to say, the coil fitting rod  26  of this embodiment swings between a fitting position and a pushing position. 
     The fitting position is a position at which the front end portion  27  of the coil fitting rod  26  is away from the core main body  70  (the holding member  20 ) as shown in the broken line in  FIG. 1 . At this fitting position, an operator performs an operation that fits the air core coil  90  to a predetermined position on the coil fitting rod  26 . The pushing position is a position at which the engagement member  28  of the front end portion  27  is engaged with the engagement target member  83  of the fitting-side end portion  79 , and the coil fitting rod  26  forms a substantially straight line with the fitting-side end portion  79  of the core main body  70 , as described above. At the pushing position, the pushing member  40  pushes the air core coil  90  toward the core main body  70 . The fitting position may be any position as long as the air core coil  90  can be fitted. 
     The pushing member  40  may have a ball screw-type configuration in which, as shown in  FIGS. 5 and 6 , a pressing member  41  that is an inverted sideway U-shaped elongated member that is fitted onto the coil fitting rod  26  at the fitting position, a screw  42  that is screwed into a screw hole formed below the pressing member  41 , and a pressing member driving member  43  such as a stepping motor for rotating the screw  42  are arranged. The screw  42  is supported by the main body of the apparatus  10 . As necessary, a driving member (not shown) using a linear motor may be used. 
     If the screw  42  is rotated forward by the pressing member driving member  43 , the pressing member  41  is moved by a screwing force in a direction (pushing direction) closer to the core main body  70  along the coil fitting rod  26 . Accordingly, the air core coil  90  is pushed by the pressing member  41  so as to be moved along the coil fitting rod  26 , and is fitted onto the core main body  70 . The pressing member  41  of this embodiment moves from a reference position shown in  FIG. 1  in the pushing direction to a first stop position shown in  FIG. 8  and a second stop position shown in  FIG. 10 . On the other hand, if the screw  42  is rotated in reverse by the pressing member driving member  43 , the pressing member  41  is moved by a screwing force in a direction away from the core main body  70 . Accordingly, the pressing member  41  that has been moved in the pushing direction returns to the reference position. 
     Furthermore, the pressing member  41  is provided with a filling member supporting portion  61  and a filling member pressing member  62  forming the filling member fitting member  60 . The filling member supporting portion  61  supports the filling member  85 . The filling member pressing member  62  pushes (fits) the filling member  85  into the gap  71  of the core main body  70  in accordance with movement of the pressing member  41  in the pushing direction. During movement of the pressing member  41  in the pushing direction, the coil fitting rod  26  and the inner circumferential face of the rotation preventing rod  15  guide movement of the filling member  85 . Note that the filling member  85  can be attached to the filling member supporting portion  61  when the coil fitting rod  26  is at the fitting position. 
     Next, an operation in which the air core coil  90  fitted on the coil fitting rod  26  is fitted onto the core main body  70  held by the holding member  20  and the filling member  85  is fitted will be described with reference to  FIGS. 3 and 8 to 10 .  FIGS. 8 to 10  are explanatory views illustrating a fitting operation of the air core coil  90  and the filling member  85 . 
     In the fitting operation of the air core coil fitting apparatus  10 , first, an operator fits the air core coil  90  onto the coil fitting rod  26  at the fitting position and attaches the core main body  70  to the holding member  20 . Next, the operator fits the filling member  85  to the filling member supporting portion  61 . The operation is started when the operator presses a start button (not shown). 
     If the start button is pressed, the upper shaft member  22  of the holding member  20  is lowered and holds the positioning portion  75  of the core main body  70 . Furthermore, the coil fitting rod  26  is moved to the pushing position, and the engagement member  28  of the front end portion  27  is engaged with the engagement target member  83  of the fitting-side end portion  79 . That is to say, the state is as shown in  FIGS. 3 and 4 . Then, the pressing member  41  starts to move in the pushing direction. In accordance with the movement of the pressing member  41 , the air core coil  90  is fitted onto the core main body  70  while moving along the coil fitting rod  26 . At that time, as described above, the air core coil  90  is fitted onto the core main body  70  while being brought into contact with the contact faces  56  and pushing up the catch pieces  51 . Subsequently, the pressing member  41  temporarily stops when reaching the first stop position shown in  FIG. 8 . 
     Subsequently, the wire rope  52  of the sending member  50  starts to move from the sending start position shown in  FIG. 8 , toward the trailing end  80  of the core main body  70  (in the pulling direction), to the sending end position shown in  FIG. 9 . As described above, in accordance with this movement, the biasing faces  55  of the respective catch pieces  51  are brought into contact with the circumferential edge of the air core coil  90 . Accordingly, the air core coil  90  is further fitted toward the trailing end of the core main body  70 . Then, the wire rope  52  temporarily stops when reaching the sending end position. 
     During the above-described movement of the wire rope  52 , the pressing member  41  has stopped at the first stop position. Accordingly, the trailing end of the air core coil  90  does not return toward the coil fitting rod  26  over the pressing member  41 . Furthermore, when the pressing member  41  that has stopped is in contact with the trailing end of the air core coil  90  as shown in  FIG. 8 , an elastic force in the pulling direction is generated in the air core coil  90  itself, and, thus, the above-described operation in which the catch pieces  51  send the air core coil  90  can be more efficiently performed. 
     Subsequently, when the wire rope  52  has stopped at the sending end position, the pressing member  41  that is stopping at the first stop position shown in  FIG. 9  starts to move again toward the second stop position shown in  FIG. 10 . That is to say, the operation in which the pressing member  41  pushes the air core coil  90  is started again. Then, the pressing member  41  temporarily stops when reaching the second stop position. 
     Furthermore, if the pressing member  41  reaches the second stop position, as described above, the filling member  85  is fitted into the gap  71  in a state where the engagement target member  83  is engaged with the engagement catch piece  86 . 
     Subsequently, the wire rope  52  that has stopped at the sending end position returns to the sending start position. At that time, the air core coil  90  is brought into contact with the contact faces  56 , and the catch pieces  51  are pushed up in a direction away from the air core coil  90  resisting the biasing force and pass by the air core coil  90 . Note that, while the wire rope  52  is returning to the sending start position, the pressing member  41  is stopping at the second stop position. 
     After the wire rope  52  returns to the sending start position, the pressing member  41  at the second stop position returns to the first stop position. Subsequently, the movement of the wire rope  52  to the sending end position and the movement of the pressing member  41  to the second stop position described above are sequentially performed again. Subsequently, the fitting operation of the air core coil fitting apparatus  10  is ended. That is to say, the fitting operations of the air core coil  90  and the filling member  85  are simultaneously completed. 
     In this embodiment, the air core coil fitting apparatus  10  performs both fitting operations of the air core coil  90  and the filling member  85 , but it is sufficient that at least the fitting operation of the air core coil  90  is performed, and the fitting operation of the filling member  85  may be performed in another step. 
     The pressing member  41  and the wire rope  52  may be moved to each movement position using a position detecting member (not shown) such as a photosensor. Furthermore, the driving member may be controlled using a control member such as a microcomputer. 
     As described above, the air core coil fitting apparatus  10  having the pushing member  40  and the sending member  50  can automatically fit the air core coil  90  onto the core main body  70 . 
     Furthermore, since the air core coil  90  can be pulled along the circumferential edge of the core main body  70  using the sending member  50 , the air core coil  90  that is being fitted onto the core main body  70  is fitted to the trailing end  80  of the core main body  70  without being stuck at the middle of the core main body  70 . Moreover, since a plurality of catch pieces  51  are used, a force in the pulling direction can be applied to the air core coil  90  at a plurality of positions, and, thus, a situation can be prevented in which part of the air core coil  90  is tensioned and deformed. 
     The description of the foregoing embodiment is for describing the present invention, and should not be interpreted as limiting or restricting the scope of claims of the present invention. Furthermore, it goes without saying that the configurations of the constituent elements of the present invention are not limited to those in the embodiment, and that various modifications are possible within the technical scope of the claims. 
     For example, in this embodiment, the pushing member  40  (the pressing member  41 ) and the sending member  50  (the wire rope  52 ) are operated in a predetermined order a predetermined number of times, but there is no particular limitation to this. The pushing member  40  and the sending member  50  may be simultaneously operated, or each of the pushing member  40  and the sending member  50  may be operated only once. 
     Furthermore, the stop position of the pressing member  41  and the sending start position and the sending end position of the wire rope  52  are not particularly limited to those described above, and may be adjusted as appropriate according to the shape of the core main body  70 , the material of the air core coil  90 , and the like. 
     Furthermore, in the foregoing embodiment, the coil fitting rod  26  is swung about the rotational shaft  29  between the fitting position and the pushing position, but there is no particular limitation to this. For example, the coil fitting rod  26  may be moved in parallel to the direction along the longitudinal direction of the coil fitting rod  26 , or may be detachably attached such that a magazine replacement is possible. 
     Furthermore, in this embodiment, the wire rope  52  on which the catch pieces  51  are arranged is disposed close to the outer circumferential edge of the core main body  70 , but there is no particular limitation to this. For example, if the core main body  70  has a relatively large inner diameter, the wire rope  52  may be disposed close to the inner circumferential edge of the core main body. In this case, the wire rope  52  may be moved along the inner circumferential edge of the core main body. 
     Furthermore, the wire rope  52  on which the catch pieces  51  are arranged as the sending member for the air core coil is used as the biasing member, but, in the case of a thin copper wire having a coil copper wire diameter of about 1.0 mm or less, the biasing member may be such that a toothed transmission belt (timing belt) is placed around a pulley so as to be pressed against the air core coil.