Patent Publication Number: US-2023145534-A1

Title: Coil forming apparatus and coil forming method

Description:
This application is based on and claims the benefit of priority from Japanese Patent Application No. 2021-184385, filed on 11 Nov. 2021, the content of which is incorporated herein by reference. 
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to a coil forming apparatus and a coil forming method. 
     Related Art 
     The stator of a rotary electric machine has a band-shaped coil in a wound state. The band-shaped coil is formed in advance in a substantially cylindrical wound state having a smaller diameter than the inside diameter of the stator core, and is inserted inside of the stator core. The band-shaped coil in the wound state is expanded in diameter inside of the stator coil, and is mounted by inserting the straight portion of the band-shaped coil into a slot of the stator core. 
     Conventionally, it has been known to mold the band-shaped coil into a wound state of substantially cylindrical shape by winding on a core member, while feeding by one pitch at a time on the columnar core member (for example, refer to Patent Document 1). 
     Patent Document 1: Japanese Patent No.4953032 
     SUMMARY OF THE INVENTION 
     In the above prior art, there is no specific disclosure about who the core member winds the band-shaped coil. 
     However, since the band-shaped coil is formed by folding conductors made of metal, spring back occurs due to the elasticity of the conductor itself. For this reason, there has been a problem in that difficulty accompanies smooth forming the band-shaped coil into a wound state with precision. If the band-shaped coil does not become the wound state precisely, poor quality occurs, and leads to a decline in yield. Consequently, wasteful consumption of material due to inferior product being produced, and the running time of equipment until reaching the quantity of production plan extends and thus electrical consumption increases, which is associated with adverse impact on the global environment. 
     The present invention has an object of providing a coil forming apparatus and a coil forming method capable of smoothly forming a band-shaped coil into a precisely wound state. In addition, it is consequently leads to suppressing wasteful consumption of material and the consumption of electrical energy by shortening the running time of equipment, and thus decreases the adverse effects on the global environment. 
     A coil forming apparatus (for example, the coil forming apparatus  1  described later) according to a first aspect of the present invention forms a band-shaped coil (for example, the band-shaped coil  100  described later) in a wound state, the band-shaped coil including a plurality of straight portions (for example, the straight portion  102  described later) and side ends (for example, the side end  103  described later) provided on both ends of the plurality of straight portions, the coil forming apparatus comprising: a coil winding jig (for example, the coil winding jig  2  described later) that winds the band-shaped coil, the coil winding jig including a plurality of comb-shaped grooves (for example, the comb-shaped groove  23  described later) on an outer periphery thereof, each of which can hold a respective one of the plurality of straight portions therein; a coil conveying mechanism (for example, the coil conveying mechanism  3  described later) that pivotally conveys the band-shaped coil along at least, a portion of the outer periphery of the coil winding jig; and guide members (for example, the guide member  4  described later) that are provided in a vicinity of both ends of the coil winding jig in an axial direction, and guide the band-shaped coil in an arc shape following an outer circumference of the coil winding jig while being in contact with the side end, and insert the plurality of straight portions respectively into the plurality of comb-shaped grooves by a second half portion (for example, the second half portion  313   b  described later) of pivotal conveying of the band-shaped coil, in which the guide member has a reforming portion (for example, the reforming portion  42  described later) which deforms and reforms the band-shaped coil into an arc shape following the outer circumference of the coil winding jig, in a state sandwiching the side end of the band-shaped coil in a first half portion (for example, the first half portion  313   a  described later) of pivotal conveying of the band-shaped coil, and has, at least in the reforming portion, a projecting-strip pressing portion (for example, the projecting-strip pressing portion  4   cp  described later) which is projected along a circumferential direction at an inner circumferential side of the guide member so as to be in sliding contact with a steady laminated part (for example, the steady laminated part SLP described later) of the band-shaped coil in which a partial difference in coil lamination number does not arise at a folding portion extending from the straight portion to the side end. 
     According to a second aspect of the present invention, in the coil forming apparatus as described in the first aspect, the guide member may be configured to include an outer-circumferential guide member (for example, the outer-circumferential guide member  401  described later) of a curvature in which an inner-circumferential surface side follows an outer circumference of the coil winding jig, and the projecting-strip pressing portion may be projected at an inner-circumferential surface of the outer-circumferential guide member. 
     A coil forming method according to a third aspect of the present invention is for forming a band-shaped coil (for example, the band-shaped coil  100  described later) having a plurality of straight portions (for example, the straight portion  102  described later) and side ends (for example, the side end  103  described later) disposed at both ends of the plurality of straight portions into a wound state, by winding on a coil winding jig (for example, the coil winding jig  2  described later) having a plurality of comb-shaped grooves (for example, the comb-shaped groove  23  described later) on an outer periphery thereof, each of which can hold a respective one of the plurality of straight portions therein, the method comprising: a pivotal conveying step of pivotally conveying the band-shaped coil along at least part of an outer circumference of the coil winding jig; and a guiding step of using guide members (for example, the guide member  4  described later) respectively arranged in a vicinity of both ends of the coil winding jig in an axial direction to guide the side ends of the band-shaped coil into an arc shape following an outer circumference of the coil winding jig, and inserting the plurality of straight portions into a respective one of the plurality of comb-shaped grooves (for example, the comb-shaped groove  23  described later) by a second half portion (for example, the second half portion  313   b  described later) of pivotal conveying of the band-shaped coil, in which the guiding step includes a reforming step (for example, step performed by reforming portion  42  described later) of deforming and reforming the band-shaped coil into an arc shape following an outer circumference of the coil winding jig, in a state sandwiching the side end of the band-shaped coil by a first half portion of pivotal conveying of the band-shaped coil, and the guiding step, at least in the reforming step, presses and reforms a steady laminated part (for example, the steady laminated part SLP described later) of the band shaped coil in which a partial difference in a coil lamination number does not arise by a folding portion extending from the straight portion to the side end, while in sliding contact by projecting-strip pressing portion (for example, the projecting-strip pressing portion  4   cp  described later) which is projected along a circumferential direction at an inner circumferential side of the guide member. 
     According to the coil forming apparatus as described in the first aspect, the guide member guides the band-shaped coil into an arc shape along the outer circumference of the coil winding jig while brought into contact with the side end, and guides so as to insert the plurality of straight portions into a respective one of the plurality of comb-shaped grooves by the second half portion of pivotal conveying of the band-shaped coil. In the guide portion of at least the reforming portion in this guiding, upon deforming and reforming the band-shaped coil into an arc shape along the outer circumference of the coil winding jig, the projecting-strip pressing portion projected along the circumferential direction at the inner circumferential side of the guide member reforms the band-shaped coil so as to abut the steady laminated part thereof. The steady laminated part is a part at which a partial difference in the coil lamination number does not arise at the folding part extending from the straight portion to side end of the band-shaped coil. For this reason, even if a band-shaped coil having a partial difference in lamination coil number at a place which Is not a steady laminated part, since there is no difference in the coil lamination number at the abutting site of the projecting-strip pressing portion, so-called looseness in which adjacent coil conducts become uneven will not arise, it is possible to make unforming winding habit, and the band-shaped coil can be smoothly formed in a precisely wound state. 
     According to the coil forming apparatus as described in the second aspect, the guide member is configured to include the outer-circumferential guide member of a curvature in which the inner-circumferential surface side follows the outer circumference of the coil winding jig, and the projecting-strip pressing portion is projected at the inner circumferential surface of the outer-circumferential guide member. Therefore, it is possible to provide the projecting-strip pressing portion at a position suited to pressing the steady laminated part at which a partial difference in coil lamination number does not arise, while in sliding contact. 
     According to the coil forming apparatus as described in the third aspect, in at least the reforming step of the guiding step, upon the reforming portion deforming and reforming the band-shaped coil into an arc shape following the outer circumference of the coil winding jig, the projecting-strip pressing portion projected along the outer circumference at the outer circumferential side of the guide member reforms by pressing the steady laminated part of the band-shaped coil while in sliding contact. The steady laminated part is a part at which a partial difference in the coil lamination number does not arise at the folding part extending from the straight portion to side end of the band-shaped coil. For this reason, even if a band-shaped coil having a partial difference in lamination coil number at a place which is not a steady laminated part, since there is no difference in the coil lamination number at the abutting site of the projecting-strip pressing portion, looseness in the coil conductor arrangement will not arise, it is possible to make unforming winding habit, and the band-shaped coil can be smoothly formed in a precisely wound state. 
     In addition, the coil forming apparatuses as described in the first to third aspects are collectively premised on using material made into a series of band-shaped coils in advance, as the coils set in the stator. Upon setting the coil into the slot of the stator, the current mainstream technique is a technique which divides and forms the coil into a plurality of segments, and after inserting into the slots, welds the coil ends. In this general technique, it is necessary to use high purity copper in the coil so as to be able to withstand the thermal processing at the weld location. In contrast, since coping with the thermal processing is unnecessary with the present invention, it is possible to use recycled copper wire containing impurities, which can contribute to the realization of the recycling of resources. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a side view showing an embodiment of a coil forming apparatus of the present invention; 
         FIG.  2    is a drawing viewing the coil forming apparatus shown in  FIG.  1    from the A direction in  FIG.  1   ; 
         FIG.  3    is a drawing viewing the coil forming apparatus shown in  FIG.  1    from the B direction in  FIG.  1   ; 
         FIG.  4    is a perspective view showing an embodiment of a coil winding jig; 
         FIG.  5    is a perspective view showing a piece member of a grip portion of a coil conveying mechanism unit; 
         FIG.  6    is a perspective view showing an aspect viewing the piece member of the grip portion of the coil conveying mechanism unit from the opposite side of  FIG.  5   ; 
         FIG.  7    is a perspective view showing a state connecting two piece members; 
         FIG.  8    is an enlarged view of a portion E in  FIG.  1   ; 
         FIG.  9    is an enlarged view of a portion C in  FIG.  1   ; 
         FIG.  10    is a cross-sectional view showing an aspect of the band-shaped coil being guided into an arc shape in the coil winding jig by a guide member; 
         FIG.  11    is an enlarged cross-sectional view of a portion D in  FIG.  1   ; 
         FIG.  12    is a partial enlarged view showing an aspect of the band-shaped coil being wound multiply on the coil winding 
         FIG.  13    is a view explaining the positional relationship between the projecting-strip pressing portion formed in the guide member of  FIG.  10    and the band-shaped coil; 
         FIG.  14    is a view explaining by showing the positional relationship between the projecting-strip pressing portion of  FIG.  13    and band-shaped coil from another angle; 
         FIG.  15    is a view showing the vicinity of a contact site between the projecting-strip pressing portion of  FIG.  13    and band-shaped coil to be enlarged; 
         FIG.  16 A  is a view explaining the pressing action by the projecting-strip pressing portion on the band-shaped coil of  FIG.  13   ; 
         FIG.  16 B  is a view explaining the pressing action of a common guide member on a band-shaped coil in comparison with  FIG.  16 A ; and 
         FIG.  17    is a perspective view showing a state in which a band-shaped coil is formed into a wound state on a coil winding jig. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Hereinafter, embodiments of the present invention will be explained. As shown in  FIG.  1   , a coil forming apparatus  1  of the present embodiment includes: a coil winding jig  2 ; a coil conveying mechanism unit  3  which causes a band-shaped coil  100  to convey along the outer circumference of the coil winding jig  2 ; and a pair of guide members  4  which guide the band-shaped coil  100  conveyed by the coil conveying mechanism unit  3  so as to be wound on the coil winding jig  2 . 
     Band-shaped Coil) 
     As shown in  FIG.  3   , the band-shaped coil  100  is molded into an elongated corrugated band-shape by rectangular conductor wires  101  having a substantially rectangular cross-sectional shape. The rectangular conductor wires  101  are formed from a metal having high conductivity such as copper or aluminum, for example. 
     The coil conductor of the band-shaped coil  100  includes a plurality of straight portions  102  and a plurality of side ends  103 . The straight portions  102  are parts to be inserted in a slot provided in the inner circumference of a stator core which is not illustrated, and are arranged in parallel at a predetermined interval to extend substantially linearly in the same direction, respectively. The side ends  103  are respectively arranged at a position closer to the side end of the band-shaped coil  100  than the straight portion  102 , i.e. at both ends in the extending direction of the straight portion  102 . The side ends  103  couple adjacent straight portions  102  at one end portion and the other end portion alternately in a mountain shape, and constitute coil end parts, each projecting in an axial, direction of the stator core from the stator, upon the band-shaped coil  100  being mounted to the stator of the stator core. 
     The band-shaped coil  100  of the present, embodiment is provided in an elongated band shape by arranging six rectangular conductor wires  101  in a manner in which the plurality of straight portions  102  are provided in parallel to each other at a constant interval, and the plurality of side ends  103  are shifted by the pitch of the straight portions  102  to be stacked. The six rectangular conductor wires  101  are provided by folding the plurality of straight portions  102  and the plurality of side ends  103  respectively in a corrugated shape. The straight portions  102  of the band-shaped coil  100  are stacked in the thickness direction (the vertical direction relative to the paper plane of  FIG.  3   ) of the band-shaped coil  100  by folding back the rectangular conductor wire  101  in the middle. The band-shaped coil  100  of the present embodiment has a length that is wound four times around the coil winding jig  2  to be described later. 
     (Coil Winding Jig) 
     As shown in  FIG.  4   , the coil winding jig  2  includes: a substantially cylindrical jig main body  21 ; a plurality of comb teeth  22  protruding radially to the outer circumference of the jig main body  21 , a plurality of comb teeth-shaped grooves  23  provided between the adjacent comb teeth  22 ,  22  in the circumferential direction, end an axial hole  24  opened at the center of the jig main body  21 . The comb teeth  22  and comb teeth-shaped groove  23  are respectively provided at both ends in the axial direction of the jig main body  21 . The phases of the comb teeth  22  and comb teeth-shaped groove  23  at one end of the jig main body  21  and the comb teeth  22  and comb teeth-shaped groove  23  at the other end are aligned. The coil winding jig  2  of the present embodiment has  72  comb teeth-shaped grooves  23  respectively at both ends in the axial direction of the jig main body  21 . The number of these comb teeth-shaped grooves  23  matches the number of slots in the stator core in which the band-shaped coils  100  are mounted. 
     The interval distance between the comb teeth  22  and comb teeth-shaped groove  23  at one end of the jig main body  21  and the comb teeth  22  and comb teeth-shaped groove  23  at the other end is substantially equal to the length in the extending direction of the straight portion  102  of the band-shaped coil  100 . Therefore, the straight portion  102  of the band-shaped coil  100  can be accommodated over the comb-shaped groove  23  at one end and the comb-shaped groove  23  at the other end of the jig main body  21 . 
     The coil winding jig  2  is formed so that the outside diameter of the coil winding jig  2  defined by the position of the leading end of the comb teeth  22  is no more than the inside diameter of the stator core, so that it becomes possible to insert inside of the stator core. The coil winding jig  2  is arranged at a predetermined site of the coil forming apparatus  1 , and is provided to be rotatable in the d 1  direction shown by the arrow in  FIG.  1   , centered around the axial hole  24  by driving of a motor which is not illustrated. 
     (Coil Conveying Mechanism Unit) 
     The coil conveying mechanism unit  3  pivotally conveys the band-shaped coil  100  along at least part of the outer circumference of the coil winding jig  2 . More specifically, the coil conveying mechanism unit  3  has a pair of conveying rails  31  constituting a conveying path of the band-shaped coil  100 , and a conveyor  32  which grips the band-shaped coil  100  and conveys along the conveying rails  31 , as shown in  FIGS.  1  and  2   . 
     The conveying rails  31  are formed in a band-shaped plate made of metal, and arranged in parallel to each other with substantially equal intervals to the length of the straight portion  102  of the band-shaped coil  100 , in the width direction of the coil forming apparatus  1 . The interval of the pair of conveying rails  31  is substantially equal to the interval distance in the axial direction of the comb teeth  22  and comb-shaped groove  23  of the coil winding jig  2 , as shown in  FIG.  2   . 
     The conveying rails  31  includes a pair of upper and lower parallel linear conveying parts  311 ,  312  forming a linear conveying path, and a pivot conveying unit.  313  which connects the ends of the linear conveying parts  311 ,  312  in an arc shape, thereby forming a lateral U-shaped conveying path. The conveying rails  31  are provided so as to surround the coil winding jig  2  by arranging on the inner side of the U-shaped portion, so that the pivot conveying unit  313  follows the outer circumference of the coil winding jig  2 . As shown in  FIG.  2   , pairs of guide grooves  314  spanning the entire length of the conveying rail  31  are respectively provided to the faces on which the pair of conveying rails  31  are opposing each other. The guide groove  314  forms a travel path of a conveyor  32  described later. 
     In the present embodiment, the pivot conveying unit  313  of the coil conveying mechanism unit  3  is formed along a range approximately ½ of the outer circumference of the coil winding jig  2 . The pivot conveying unit  313  includes a first half portion  313   a  on the introducing side of the band-shaped coil  100  and a second half portion  313   b  on the discharging side of the band-shaped coil  100 . The first half portion  313   a  is formed over a range of approximately ½ the first half of the pivot conveying unit  313 . The second half portion  313   b  is provided over a range of approximately ½ the second half of the pivot conveying unit  313 . However, the pivot conveying unit  313  may be configured to be able to pivotally convey the band-shaped coil  100  along at least a portion of the outer periphery of the coil winding jig  2 . 
     The conveyor  32  extends long along the conveying rail  31  and can move along the conveying rail  31  between the pair of conveying rails  31 . The conveyor  32  has a length corresponding to at least the total length of the band-shaped coil  100 , and moves along the conveying rail  31  in a state of holding the straight portions  102  of the band-shaped coil  100  on the upper surface, thereby pivotally conveying the band-shaped coil  100  along the outer periphery of the coil winding jig  2 . 
     As shown in  FIGS.  1  and  3   , the conveyor  32  includes a plurality of piece members  33  of the same structure arranged in a multilayer shape along the length direction of the band-shaped coil  100 . As shown in  FIGS.  5 ,  6  and  7   , the piece members  33  each include a piece member body  331  having a substantially rectangular plate-like shape made of metal, and a pair of guide projections  332 , each projecting laterally from both ends in the width direction at the lower end of the piece member body  331 . The guide projections  332  of the present embodiment each include a rotatable roller; however, they may be simple projections. In addition, regarding the directions of the piece member  33 , in  FIGS.  5 ,  6 , and  7   , the X direction is defined as the width direction, the Y direction is defined as the thickness direction, and the Z direction is defined as the height direction. In the height direction, the upper direction in the drawings is defined as “up”, and the lower direction is defined as “down”. 
     The piece member body  331  has a thickness substantially equal to the gap between adjacent straight portions  102  and  102  in the length direction of the band-shaped coil  100 . The piece member body  331  has an upper end surface  331   a,  and the upper end surface  331   a  includes a pair of first gripping claws  333 , each projecting in the height direction. The first gripping claw  333  has a thickness of approximately ½ the thickness of the piece member body  331 . The thickness of the first gripping claw  333  is substantially equal to the gap between the adjacent straight portions  102  and  102  of the band-shaped coil  100 . The first gripping claw  333  is provided at a position in the vicinity of one end in the thickness direction of the piece member body  331  on the upper end surface  331   a.  The pair of first gripping claws  333  are disposed apart from each other on both end sides in the width direction of the piece member body  331  with a predetermined interval therebetween. 
     The first gripping claws  333  each have an upper end surface, and the upper end surface includes a meshing groove  333   a  that meshes with a tip of the comb tooth  22  of the coil winding jig  2 . More specifically, as shown in  FIG.  4   , the tip of the comb tooth  22  of the coil winding jig  2  has an engaging portion  22   a.  The meshing groove  333   a  has a position and a shape capable of meshing with the engaging portion  22   a  of the coil winding jig  2 . 
     The first gripping claws  333  each have a tapered surface  333   b  on the side opposite to the side on which the upper end surface  331   a  is provided. The tapered surface  333   b  allows the first gripping claw  333  to be formed in a slightly tapered shape as it moves away from the piece member body  331 . 
     The pair of first gripping claws  333  has a rectangular recess  334  along the height direction of the piece member body  331  provided therebetween. The recess  334  is provided to span from the upper end surface  331   a  to the portion approximately ½ the height of the piece member body  331 . The depth of the recess  334  along the thickness direction of the piece member body  331  has a depth of approximately ½ the thickness of the piece member body  331 , similarly to the first gripping claw  333 . 
     The piece member body  331  includes a rectangular protrusion  335  provided on one side surface  331   b.  The protrusion  335  is provided to protrude, in the thickness direction of the piece member body  331 , in a block shape toward a direction perpendicular to the side surface  331   b  from the side surface  331   b  which is opposite to the side where the first gripping claw  333  is provided. The protrusion  335  is provided above a site which is approximately ½ the height of the piece member body  331  In the height direction. The height of the protrusion  335  along the height direction of the piece member body  331  is substantially equal to the height of the recess  334 . The thickness of the protrusion  335  along the thickness direction of the piece member body  331  is substantially equal to the depth of the recess  334 . 
     The protrusion  335  includes a second gripping claw  336  provided at an upper end portion thereof. Similarly to the first gripping claws  333 , the second gripping claw  336  projects upward from the upper end surface  331   a  of the piece member body  331 . Similarly to the first gripping claws  333 , the thickness of the second gripping claw  336  is substantially equal to the gap between the adjacent straight portions  102  and  102  of the band-shaped coil  100 . Since the second gripping claw  336  has the same width as the protrusion  335 , as shown in  FIG.  7   , when the two piece members  33  and  33  are stacked with their directions aligned with each other, the second gripping claw  336  of the one piece member  33  is disposed between the pair of first gripping claws  333  and  333  of the other piece member  33 . 
     The second gripping claw  336  has tapered surfaces  336   a  on both the side on which the upper end surface  331   a  is provided and the opposite side thereto. These tapered surfaces  336   a  allow the second gripping claw  336  to be formed in a slightly tapered shape as it moves away from the piece member body  331 . 
     As shown in  FIG.  7   , the plurality of piece members  33  are aligned such that the first gripping claws  333  and the second gripping claws  336  are oriented in the same direction, and the protrusions  335  of the piece member  33  are stacked so as to be accommodated in the recess  334  of the adjacent piece member  33 . As a result, the adjacent piece members  33  and  33  are in close contact with each other and stacked. 
     The piece member  33  includes a through hole  337   a  extending in the width direction of the piece member  33  at a portion in the vicinity of the root of the first gripping claw  333  and substantially at the same height as the upper end surface  331   a  of the piece member body  331 . In addition, the protrusion  335  includes a through hole  337   b  extending in the width direction of the protrusion  335  at a portion in the vicinity of the root of the second gripping claw  336  and substantially at the same height as the upper end surface  331   a  of the piece member foody  331 . As shown in  FIG.  7   , after the two piece members  33  and  33  are stacked, a shaft member  338  is inserted to span the through hole  337   a  and the through hole  337   b  which are in communication with each other. Thus, with the shaft member  338  as a rotation axis, the lower end sides of the plurality of pieces members  33  where the guide projections  332  are provided are coupled with each other in a rotatable (swingable) manner in the length direction of the conveyor  32 , thereby forming an elongated conveyor  32 . 
     As shown in  FIGS.  3 ,  7 ,  8 , and  9   , in the conveyor  32 , gripping grooves  321  each gripping the straight portion  102  of the band-shaped coil  100  is provided between the first, gripping claws  333  and  333 , and between the second gripping claws  336  and  336  of the adjacent piece members  33 ,  33 . The upper end surface  331   a  of the piece member body  331  is provided at the bottom of the gripping groove  321 . The gripping grooves  321  each have a groove width capable of accommodating the straight portion  102  of the band-shaped coil  100 . The groove width of the gripping groove  321  is substantially equal to the groove width along the circumferential direction of the comb-shaped groove  23  of the coil winding jig  2 . The arrangement pitch of the gripping grooves  321  along the length direction of the conveyor  32  is substantially equal to the arrangement pitch of the comb-shaped groove  23  along the circumferential direction of the coil winding jig  2 . Therefore, when the meshing groove  333   a  and the engaging portion  22   a  are engaged with each other, as shown in  FIG.  3   , the gripping groove  321  of the conveyor  32  and the comb-shaped groove  23  of the coil winding jig  2  are in communication with each other in the radial direction of the coil winding jig  2 . 
     In the conveyor  32 , each guide projection  332  of the piece member  33  is slidably accommodated in the guide groove  314  of the conveying rail  31 , and protrudes toward the inside of the U-shaped conveying rail  31 . Furthermore, as shown in  FIG.  8   , the meshing groove  333   a  of the piece member  33  meshes with the engaging portion  22   a  of the coil winding jig  2  at the location immediately below the coil winding jig  2 , such that the conveyor  32  is in synchronization with the rotation of the coil winding jig  2  by the rotation of the coil winding jig  2  in the direction d 1  so as to be movable in the direction d 2 . When the conveyor  32  moves in an arc shape along the pivot conveying unit  313  of the conveying rail  31 , the guide projections  332  of the piece members  33  and  33  adjacent to each other rotate by means of the shaft member  338  so as to be isolated with the portions of the first gripping claw  333  and the second gripping claw  336  which are sites for gripping the straight portions  102  as references, such that the conveyor  32  is smoothly movable. 
     As shown in  FIGS.  3 ,  8 , and  9   , in the conveyor  32  which is slidably disposed on the conveying rail  31 , the first gripping claw  333  and the second gripping claw  336  are inserted into the gap between the straight portions  102  and  102  adjacent to each other in the length direction of the band-shaped coil  100 , and the straight portions  102  are accommodated in the respective gripping grooves  321 , whereby the band-shaped coil  100  is gripped. Therefore, it is possible for the conveyor  32  to convey the band-shaped coil  100  in a state of holding the straight portions  102  at regular intervals without displacing the straight portions. As shown in  FIGS.  2  and  3   , the side ends  103  of the band-shaped coil  100  protrude laterally on both sides in the moving direction of the conveyor  32 . It should be noted that, in  FIG.  1   , the band-shaped coil  100  to be gripped by the conveyor  32  is not shown. 
     (Guide Member) 
     As shown in  FIG.  1   , the guide members  4  are made from a metal band-shaped plate material, and provided in a substantially U-shape laterally along the pivot conveying unit  313  of the conveying rail  31 . In the guide members  4 , the inside of the U-shaped portion is provided so as to face the direction of the coil winding jig  2  in the vicinity of the both ends of the coil winding jig  2  in the axial direction (the vertical direction relative to the paper plane of  FIG.  1   , and the left-right direction in  FIG.  2   ) so as to sandwich the coil winding jig  2 , and is fixed to the conveying rail  31 . 
     The guide member  4  includes an introduction end  4   a  which introduces the side end  103  of the band-shaped coil  100  conveyed by the conveyor  32 , a discharge end  4   b  which discharges the side end  103  of the band-shaped coil  100 , and an inner wail surface  41  which guides the side end  103  from the introduction end  4   a  to the discharge end  4   b.  The inner wall surface  41  is formed by a curved surface which smoothly curves continuously from the introduction end  4   a  to the discharge end  4   b  so as to follow approximately ½ of the outer periphery of the coil winding jig  2 . 
     More specifically, the guide member  4  includes an outer-circumferential guide member  401  of a curvature in which the inner wall surface  41  on its own inner circumferential side follows the outer circumference of the coil winding jig  2 , and a projecting-strip pressing portion  4   cp  is projected along the circumferential direction at the inner wall surface  41  of the outer-circumferential guide member  401 . In  FIGS.  10 ,  11  and  12   , an arc part is illustrated as a dashed line in the side view corresponding to the base where the projecting-strip pressing portion  4   cp  projects. The surface on the inner circumferential side extending in the circumferential direction of the projecting-strip pressing portion  4   cp  presses while in sliding contact with the side end  103  of the band-shaped coil  100 . The guide member  4  smoothly guides the entirety of the band-shaped coil  100  in an arc shape so as to follow the outer circumference of the coil winding jig  2 , by bringing the side end  103  introduced from the introduction end  4   a  into contact with the projecting-strip pressing portion  4   cp  of the inner wall surface  41 , while the band-shaped coil  100  is pivotally conveyed by the pivot conveying unit  313 . 
     The curvature of the projecting-strip pressing portion  4   cp  on the arc-shaped inner wail surface  41  of the guide member  4  is formed so as to gradually change greatly as approaching the discharge end  4   b  from the introduction end  4   a.  More specifically, as shown in  FIG.  10   , the projecting-strip pressing portion  4   cp  of the inner wall surface  41  at the introduction end  4   a  is arranged somewhat more to the outer side in the radial direction than the outer circumference of the coil winding jig  2 . However, the projecting-strip pressing portion  4   cp  of the inner wall surface  41  gradually reduces in diameter smoothly as approaching the discharge end  4   b  from the introduction end  4   a.  The projecting-strip pressing portion  4   cp  of the inner wall surface  41  at the discharge end  4   b  is arranged more to the inner side in the radial direction than the outer circumference of the coil winding jig  2 . For this reason, the projecting-strip pressing portion  4   cp  of the inner wall surface  41  of the guide member  4  guides the band-shaped coil  100  so as to gradually round in an arc shape of a smaller diameter than the outside diameter of the coil winding jig  2 , while pressing in sliding contact on the side end  103  of the band-shaped coil  100 , as the band-shaped coil  100  approaches the second half portion  313   b  from the first half portion  313   a  of the pivot conveying unit  313 . 
     The band-shaped coil  100  is gradually pressed toward the coil winding jig  2 , by being guided to the projecting-strip pressing portion  4   cp  of inner wall surface  41  of the guide member  4 , as approaching the second half portion  313   b  from the first half portion  313   a  of the pivot conveying unit  313 . The straight portion  102  gripped by the conveyor  32  thereby forcibly separates from the gripping groove  321  so as to lift up, and gradually moves towards the inside of the comb teeth-shaped groove  23  of the coil winding jig  2 . The end edge of the projecting-strip pressing portion  4   cp , which the discharge end  4   b  of the guide member  4 , is arranged more to the inner side in the radial direction than the outer circumference of the coil winding jig  2 ; therefore, the straight portion  102  is completely inserted into the comb teeth-shaped groove  23  of the coil winding jig  2 . Subsequently, the band-shaped coil  100  is wound on the coil winding jig  2  by rotation of the coil winding jig  2 . It should be noted that, in  FIGS.  10  and  12   , the conveyor  32  is omitted from illustration, and the band-shaped coil  100  is shown to be simplified. 
     It should be noted the guide member  4  is not limited to a structure having the inner wall surface  41  which is continuous over the entirety of the pivot conveying unit  313  as in the present embodiment. The guide member  4 , although not Illustrated, may be a structure arranging a plurality of guide rollers so as to follow the pivot conveying unit  313 , for example. However, in the viewpoint of configuring so as to be able to continuously guide the band-shaped coil  100  to the comb teeth-shaped groove  23  of the coil winding jig  2 , and be able to smoothly insert the straight portion  102  into the comb teeth-shaped groove  23 , the guide member  4  preferably has the inner wall surface  41  contacting at the wall surface with the side end  103  at the second half portion  313   b  of the pivot conveying unit  313 . In the viewpoint of configuring so as to be able to smoothly guide the band-shaped coil  100  into an arc shape over the entirety of the pivot conveying unit  313 , and be able to smoothly insert the straight portion  102  into the comb teeth-shaped groove  23  of the coil winding jig  2 , the guide member  4  preferably has the inner wail surface  41  at which the aforementioned projecting-strip pressing portion  4   cp  is formed contacting at the wall surface with the side end  103  in the entirety of the pivot conveying unit  313  as in the present embodiment. 
     As shown in  FIGS.  1  and  2   , the guide member  4  has, at the side of the introduction end  4   a  thereof, the pair of reforming portions  42  for causing the band-shaped coil  100  introduced to the pivot conveying unit  313  to forcibly deform and reform so as to curve into an arc shape along the outer circumference of the coil winding jig  2 . In the guide member  4 , the range in which the reforming portion  42  is provided is within the range of the first half portion  313   a  of the pivot; conveying unit  313 . More specifically, the reforming portion  42 , for example, can be provided from the introduction end  4   a  of the guide member  4  over a range of approximately ½ to approximately  3 / 4  of the first half portion  313   a  of the pivot conveying unit  313 . The projecting-strip pressing portion  4   cp  of the guide member  4  is provided to at least span the range of the reforming portion  42 ; however, in the present embodiment, the projecting-strip pressing portion  4   cp  is provided to span the entirety of the pivot conveying unit  313 , which is the overall length of the guide member  4 . 
     Reforming to the band-shaped coil  100  by the reforming portion  42  is performed by configuring to make a bending habit along the curvature of the guide member  4  in the band-shaped coil  100 , by the projecting-strip pressing portion  4   cp  on the inner circumferential side of the guide member  4  pressing the band-shaped coil  100  being pivotally conveyed while in sliding contact. More specifically, a steady laminated part SLP of the band-shaped coil  100  at which a partial difference in the coil lamination number does not arise by the folding portion extending from the straight portion  102  to the side end  103  of the band-shaped coil  100  makes a bending habit by the projecting-strip pressing portion  4   cp  pressing while in sliding contact. 
     Herein,  FIG.  13    shows the positional relationship between the projecting-strip pressing portion  4   cp  formed in the outer-circumferential guide member  401  in the guide member  4  of  FIG.  10    and the band-shaped coil  100 . In addition, in  FIG.  14   , the positional relationship between the projecting-strip pressing portion  4   cp  of  FIG.  13    and the band-shaped coil  100  is shown from a different angle. In  FIG.  13   , one side end  103  side of the band-shaped coil  100  actually bent into an arc in a direction perpendicular to the paper plane is shown to be expanded planarly. A folding portion of a coil conductor which started to bend from each straight portion  102  of the band-shaped coil  100  towards the corresponding side end  103  serves as a steady laminated part SLP of the band-shaped coil  100  at which a partial difference in coil lamination number does not arise. 
     The reforming portion  42  is configured by the projecting-strip pressing portion  4   cp  of the outer-circumferential guide member  401  and the inner-circumferential guide member  421  of the guide member  4 . The inner-circumferential guide member  421  is formed so as to curve in an arc shape smoothly along the curvature of the projecting-strip pressing portion  4   cp . The reforming portion  42  are respectively arranged so as to sandwich the coil winding jig  2  from both end sides in the axial direction. In the reforming portion  42 , a reforming groove  422  which sandwiches the side end  103  is formed between the projecting-strip pressing portion  4   cp  of the outer-circumferential guide member  401  and the inner-circumferential guide member  421 . The projecting-strip pressing portion  4   cp  of the outer-circumferential guide member  401  of the reforming portion  42  contacts and supports a surface on the outer side in the radial direction of the side end  103  of the band-shaped coil  100 , and the inner-circumferential guide member  421  contacts and supports a surface on the inner side in the radial direction of the side end  103  of the band-shaped coil  100 . 
     The reforming portion  42  causes the side end  103  of the band-shaped coil  100  introduced to the introduction end  4   a  of the guide member  4  to forcibly deform so as to curve into an arc shape, by conveying while being accepted and clamped in the reforming groove  422 . The band-shaped coil  100  is reformed into an arc shape, at an early stage of introduction of the pivot conveying unit  313  before winding on the coil winding jig  2 , and the force trying to elastically recover to a fiat shape while guided to an arc shape by the inner wall surface  41  of the guide member  4  subsequently is suppressed. Therefore, the band-shaped coil  100  is smoothly and precisely molded into the substantially cylindrical wound shape, in combination with being guided into the arc shape by the guide member  4 . 
     In  FIG.  15   , the vicinity of a contact site between the projecting-strip pressing portion  4   cp  and band-shaped coil  100  of  FIG.  13    is shown to be enlarged. The folding portion towards the side end  103  from the gripping portion of the band-shaped coil  100  in which the straight portions  102  are gripped in the conveyor  32  offers the steady laminated part SLP of the band-shaped coil  100  at which a partial difference in coil lamination number does not arise. The projecting-strip pressing portion  4   cp  projected to the outer-circumferential guide member  401  is positioned so that a flat part of the tip thereof faces this steady laminated part SLP. The projecting-strip pressing portion  4   cp  presses the steady laminated part SLP of the band-shaped coil  100  while in sliding contact. 
     Next, the action of the projecting-strip pressing portion  4   cp  making sliding contact with the steady laminated part SLP of the band-shaped coil  100 , and pressing this sliding contact position, while comparing  FIG.  16 A  and  FIG.  16 B .  FIG.  16 A  shows a case of the projecting-strip pressing portion  4   cp  being provided at a portion just making sliding contact with the steady laminated part SLP of the band-shaped coil  100 .  FIG.  16 B  shows a case of the projecting-strip pressing portion  4   cp  being provided at a position deviated from the position in  FIG.  16 A . As easily understood by referencing  FIG.  16 A , in the steady laminated part SLP, a difference in coil lamination number does not arise at any position in the circumferential direction along the pivotal conveying of the band-shaped coil  100 . 
     In other words, in the case of  FIG.  16 A , the coil lamination number of the steady laminated part SLP is steady at 2 layers. For this reason, the projecting-strip pressing portion  4   cp  makes sliding contact equally on the outer circumferential side of each coil conductor of the band-shaped coil  100  to press this sliding contact site to the inner-circumferential side. For this reason, the coil conductor is orderly pushed to the comb-shaped grooves  23  of the coil winding jig  2 , without producing a disturbance in lamination. 
     In the case of  FIG.  16 B , since the projecting-strip pressing portion  4   cp  is not facing the steady laminated part SLP of the band-shaped coil  100 , a difference appears in the coil lamination number by the position in the circumferential direction along the pivot conveying of the band-shaped coil  100 . In other words, the coil lamination number has a level difference between a one-layer location and two-layer location according to the position in the circumferential direction, and a void VS appears at the location of the level difference. For this reason, the projecting-strip pressing portion  4   cp  is inhibited from equally making sliding contact with the outer-circumferential side of each coil conductor of the band-shaped coil  100 , and a location which cannot press the coil conductor to the inner-circumferential side partially occurs. 
     (Coil Forming Method) 
     Next, a method of forming the band-shaped coil  100  into a substantially cylindrical wound state by the coil forming apparatus  1  will be described. 
     First, the coil winding jig  2  is provided to be rotatable by the driving of a motor (not shown) Inside the U-shaped portion of the conveying rail  31  of the coil forming apparatus  1 . After the coil winding jig  2  is provided in the coil forming apparatus  1 , the band-shaped coil  100  which is formed in advance in a long corrugated band shape is supplied to the conveyor  32  which is provided in the straight conveying unit  311  on the lower side of the conveying rail  31  by a coil feeding device or an operator (not shown). The band-shaped coil  100  is gripped by the conveyor  32  by inserting the first gripping claws  333  and the second gripping claws  336  of the respective piece members  33  of the conveyor  32  into the gaps between the adjacent straight portions  102  and  102 , and by accommodating the straight portions  102  in the gripping grooves  321 , respectively. 
     Thereafter, the conveyor  32  gripping the base-shaped coil  100  is pressed by a conveyer pressing device (not shown) or an operator, and the straight conveying unit  311  is moved toward the coil winding jig  2  so that the meshing groove  333   a  of the piece member  33  and the engaging portion  22   a  of the coil winding jig  2  are engaged with each other. When the coil winding jig  2  is rotationally driven in the direction d 1  after the meshing groove  333   a  and the engaging portion  22   a  are meshed with each other immediately below the coil winding jig  2 , the conveyor  32  moves the conveying rail  31  along the direction d 2  in synchronization with the rotation of the coil winding jig  2 , and pivotally conveys the band-shaped coil  100  along the outer periphery of the coil winding jig  2  (pivot conveying step). 
     When the conveyor  32  reaches the pivot conveying unit  313 , the side end  103  of the band-shaped coil  100  is first introduced into the reforming groove  422  of the reforming portion  42  from the introduction end  4   a  of the guide member  4 . Following this introduction, the side end  103  is pivotally conveyed while sandwiched between the projecting-strip pressing portion  4   cp  which projected along the circumferential direction at the inner wall surface  41  of the outer-circumferential guide member  401 , and the inner-circumferential guide member  421 . Upon this pivotal conveying, the projecting-strip pressing portion  4   cp  presses while in sliding contact the steady laminated part SLP in which a partial difference in coil lamination number does not arise at the folding portion extending the straight portion  102  to side end  103  to reform the band-shaped coil  100 . In the steady laminated part SLP, a difference in the coil lamination number does not arise at any position in the circumferential direction along the pivot conveying of the band-shaped coil  100 . For this reason, the projecting-strip pressing portion  4   cp  makes sliding contact equally to the outer circumferential side of the side end  103  of the band-shaped coil  100 . For this reason, the band-shaped coil  100  is reformed by forcibly deforming so as to bend into an arc shape along the reforming groove  422  (reforming step of guiding step). 
     The band-shaped coil  100  passing through the reforming portion  42  is guided so as to be gradually rounded in an arc shape while being pivotally conveyed along at least a portion of the outer periphery of the coil winding jig  2  along the inner wall surface  41  of the guide member  4 , i.e., a range of approximately ½ the outer periphery of the coil winding jig  2 , accompanying the rotation of the coil winding jig  2 . 
     Since the curvature of the projecting-strip pressing portion  4   cp  on the inner wall surface  41  of the outer-circumferential guide member  401  gradually increases from the first half portion  313   a  to the second half portion  313   b  of the pivot conveying unit  313 , the side end  103  of the band-shaped coil  100  is pressed by the projecting-strip pressing portion  4   cp  so as to gradually decrease the diameter inwardly in the radial direction. Thus, the band-shaped coil  100  is rounded to have a smaller diameter than the outer diameter of the coil winding jig  2 . 
     The side end  103  which is pressed against the projecting-strip pressing portion  4   cp  on the inner wall surface  41  of the outer-circumferential guide member  401  gradually separates the straight portions  102  from the gripping grooves  321  toward the comb-shaped groove  23  of the coil winding jig  2  as the band-shaped coil  100  approaches the discharge end  4   bb  of the guide member  4 . As shown in  FIG.  10   , the straight portions  102  completely detached from the gripping grooves  321  are inserted into the respective comb-shaped grooves  23  of the coil winding jig  2  in communication with the gripping grooves  321 , while being pressed against projecting-strip pressing portion  4   cp  (guiding step). 
     In the aforementioned guiding step, the projecting-strip pressing portion  4   cp  presses the steady laminated part SLP of the band-shaped coil  100  while in sliding contact. At the steady laminated part SLP, a difference in the coil lamination number does not arise at any position in the circumferential direction along the pivotal conveying of the band-shaped coil  100 . For this reason, the projecting-strip pressing portion  4   cp  makes equal sliding contact on the outer circumferential side of each coil conductor of the band-shaped coil  100 , and presses the sliding contact site thereof to the inner circumferential side. For this reason, the coil conductor is orderly pushed to the comb-shaped grooves  23  of the coil winding jig  2 , without producing a disturbance in lamination. Subsequently, the band-shaped coil  100  is discharged from the discharge end  4   b  of the guide member  4 , while being wound on the coil winding jig  2 , accompanying rotation of the coil winding jig  2 . 
     If the entirety of the conveyor  32  finishes moving along the conveying rails  31 , the band-shaped coil  100  is wound four times around the coil winding jig  2  to be multiply wound, as shown in  FIG.  12   , by the straight portions  102  being introduced into the comb teeth-shaped grooves  23  in a layered manner. The band-shaped coil  100  is thereby easily molded into a substantially cylindrical wound state, as shown in  FIG.  17   . Since the straight portions  102  of the band-shaped coil  100  in the wound state is accommodated within the comb teeth-shaped grooves  23 , there is no concern of displacing. Therefore, the band-shaped coil  100  can stably hold the substantially cylindrical wound state. It should be noted that the band-shaped coil is not limited to being multiply wound on the coil winding jig  2 . 
     According to the above explained coil forming apparatus  1 , the following effects are exerted. That is, the coil forming apparatus  1  of the present embodiment forms the band-shaped coil  100  in a wound state, and the band-shaped coil  100  includes the plurality of straight portions  302  and the side ends  103  provided on both ends of the plurality of straight portions  102 . 
     The coil forming apparatus  1  includes: the coil winding jig  2  that winds the band-shaped coil  100 , the coil winding jig  2  including the plurality of comb-shaped grooves  23  on the outer periphery thereof, each of which can hold a respective one of the plurality of straight portions  102  therein; the coil conveying mechanism unit  3  that pivotally conveys the band-shaped coil  100  along at least a portion of the outer periphery of the coil winding jig  2 ; and the guide members  4  that are respectively provided in the vicinity of both ends of the coil winding jig  2  in the axial direction, and guide the band-shaped coil  100  into an arc shape along an outer circumference of the coil winding jig  2  while being in contact with the side end  103 , and insert the plurality of straight portions  102  into each of the plurality of comb-shaped grooves  23 , by the second half portion  313   b  of the pivot conveying unit  313  which pivotally conveys the band-shaped coil  100 . 
     The guide member  4  has the reforming portion  42  which causes the band-shaped coil  100  to deform and reform into an arc shape along the outer circumference of the coil winding jig  2 , in a state sandwiching the side end  103  of the band-shaped coil  100  in the first half portion  313   a  of the pivot conveying unit  313  which pivotally conveys the band-shaped coil  100 . 
     The guide member  4  has, in at least the reforming portion  42 , the projecting-strip pressing portion  4   cp  projected along the circumferential direction on the inner-circumferential side of the guide member  4  so as to press while in sliding contact the steady laminated part SLP of the band-shaped coil in which a partial difference in coil lamination number does not. arises in the folding portion extending the straight portion  102  to the side end  103 . In the steady laminated part SLP, a difference in the coil lamination number does not arise at any position in the circumferential direction along the pivotal conveying of the band-shaped coil  100 . 
     For this reason, the projecting-strip pressing portion  4   cp  makes sliding contact and presses evenly on the outer-circumferential side of the side end  103  of the band-shaped coil  100 . Therefore, the band-shaped coil  100  can forcibly deform so as to bend along the reforming groove  422  and reform into an arc shape, without causing so-called looseness in which adjacent coil conductors become uneven. Therefore, it is possible to form the band-shaped coil  100  into the wound state precisely and orderly. 
     The guide member  4  of the present embodiment is configured to include the outer-circumferential guide member  401  of curvature in which the inner-circumferential surface side follows the outer circumference of the coil winding jig  2 , and the projecting-strip pressing portion  4   cp  is projected at the inner-circumferential surface of the outer-circumferential guide member  401 . Therefore, it is possible to provide the projecting-strip pressing portion  4   cp  at a portion suited to pressing while in sliding contact the steady laminated part SLP in which a partial difference in coil lamination number does not arise. 
     The coil forming method described above has the following advantageous effects. More specifically, the coil forming method of the present embodiment is for forming a band-shaped coil  100  having a plurality of straight portions  102  and side ends  103  disposed at both ends of the plurality of straight portions  102  into a wound state, by winding on a coil winding jig  2  having a plurality of comb-shaped grooves  23  on an outer periphery thereof, each of which can hold a respective one of the plurality of straight portions  102  therein, the method comprising: a pivotal conveying step of pivotally conveying the band-shaped coil  100  along at least part of an outer circumference of the coil winding jig  2 ; and a guiding step of using guide members  4  respectively arranged in a vicinity of both ends of the coil winding jig  2  in an axial direction to guide the side ends  103  of the band-shaped coil  100  into an arc shape following an outer circumference of the coil winding jig  2 , and inserting the plurality of straight portions  102  into a respective one of the plurality of comb-shaped grooves  23  by a second half portion  313   b  of pivotal conveying of the band-shaped coil, in which the guiding step includes a reforming step (for example, step performed by reforming portion  42  described later) of deforming and reforming the band-shaped coil  100  into an arc shape following an outer circumference of the coil winding jig  2 , in a state sandwiching the side end  103  of the band-shaped coil  100  by a first half portion  313   a  of pivotal conveying of the band-shaped coil  100 , and the guiding step, at least in the reforming step, presses and reforms a steady laminated part SLP of the band shaped coil  100  in which a partial difference in a coil lamination number does not arise by a folding portion extending from the straight  102  portion to the side end  103 , while in sliding contact by projecting-strip pressing portion  4   cp  which is projected along a circumferential direction at an inner circumferential side of the guide member  4 . According to this, since there is no difference in the coil lamination number at the abutting site of the projecting-strip pressing portion, it is possible to make a uniform winding without looseness of the coil conductor arrangement occurring, and thus possible to perform a high-efficiency coil forming operation. 
     Although an embodiment of the present invention has been explained above, the present invention is not to be limited thereto. The configurations of detailed parts may be modified where appropriate within the scope of the gist of the present invention. For example, in the aforementioned embodiment, the projecting-strip pressing portion  4   cp  projects at the inner-circumferential surface of the outer-circumferential guide member  401  of a curvature in which the inner-circumferential surface side follows the outer circumferential of the coil winding jig  2 ; however, an alternate configuration can be adopted. In other words, the outer-circumferential guide member  401  itself may be configured with a width dimension corresponding to the steady laminated part SLP of the band-shaped coil  100 , or may be configured so that itself functions as the projecting-strip pressing portion  4   cp.    
     EXPLANATION OF REFERENCE NUMERALS 
       1  coil forming apparatus 
       2  coil winding jig 
       23  comb teeth-shaped groove 
       3  coil conveying mechanism unit 
       313  pivot conveying unit 
       313   a  first half portion 
       313   b  second half portion 
       4  guide member 
       4   cp  projecting-strip pressing portion 
       41  inner wall surface 
       42  reforming portion 
       401  outer-circumferential guide member 
       100  band-shaped coil 
       102  straight portion 
       103  side end 
     SLP steady laminated part 
     VS void