Coil forming apparatus and coil forming method

Abstract

A coil forming apparatus, when forming a strip coil with side ends at both ends of multiple straight sections into a wound state, during the process of rotating and conveying the strip coil along the outer periphery of a coil winding fixture using a coil conveying mechanism, clamps the side ends using shaping portions of guide members arranged near both axial ends of the coil winding fixture, shaping the strip coil into an arc shape in the first half of the rotating conveying, and guiding the side ends to a reduced diameter in the second half of the rotating conveying, so that multiple straight sections are respectively inserted into multiple comb-shaped grooves. At least in the shaping portion, for the stable stacked portion of the strip coil where the bending portion connecting the straight section to the side end does not locally produce a difference in the number of coil layers, a convex pressing portion is used to press while sliding contact to prevent the coil conductor from scattering. As a result, the strip coil can be easily and accurately formed into a wound state.

Description

Technical Field

[0001] This invention relates to a coil forming apparatus and a coil forming method. Background Technology

[0002] The stator of a rotary electric machine has a wound strip coil. The strip coil is pre-formed into a roughly cylindrical wound state with a diameter smaller than the inner diameter of the stator core and is inserted into the inside of the stator core. The wound strip coil is installed by expanding the diameter inside the stator core and inserting the straight portion of the strip coil into a slot in the stator core.

[0003] Previously, it was known that a generally cylindrical wound state was formed by feeding a strip coil into a cylindrical core component at intervals while winding it onto the core component (for example, see Patent Document 1).

[0004] [Previous Technical Documents]

[0005] (Patent Documents)

[0006] Patent Document 1: Japanese Patent No. 4953032 Summary of the Invention

[0007] [The problem the invention aims to solve]

[0008] In the aforementioned prior art, the specific method of how the core component winds the strip coil was not disclosed.

[0009] However, since strip coils are formed by bending metal conductors, they will spring back due to the conductor's own elasticity. Therefore, there is a problem in achieving a high-precision and smooth winding of the strip coil. If the strip coil is not wound with high precision, quality defects will occur, leading to a decrease in yield. Furthermore, the wasted material due to defective products, or the increased power consumption caused by extended equipment operation time before reaching planned production quantities, will have adverse effects on the environment.

[0010] The purpose of this invention is to provide a coil forming apparatus and a coil forming method that can form strip coils into a wound state with high precision and smoothness. Furthermore, it reduces material waste, shortens device operating time to reduce energy consumption, and minimizes adverse impacts on the environment.

[0011] [Technical means to solve the problem]

[0012] (1) The coil forming apparatus of the present invention (e.g., coil forming apparatus 1 described later) forms a strip coil (e.g., strip coil 100 described later) into a wound state. The strip coil has a plurality of straight portions (e.g., straight portions 102 described later) and side ends (e.g., side ends 103 described later) disposed at both ends of the plurality of straight portions. The coil forming apparatus includes: a coil winding fixture (e.g., coil winding fixture 2 described later), having a plurality of comb-shaped grooves (e.g., comb-shaped grooves 23 described later) on its outer periphery into which the plurality of straight portions can be inserted respectively, and configured to wind the strip coil; a coil conveying mechanism (e.g., coil conveying mechanism 3 described later), configured to rotatably convey the strip coil along at least a portion of the outer periphery of the coil winding fixture; and a guide member (e.g., guide member 4 described later), respectively disposed near both ends of the axial direction of the coil winding fixture, contacting the side ends while guiding the strip coil along the axial direction. The outer periphery of the aforementioned coil winding fixture is arc-shaped, and in the latter half of the rotational transport of the aforementioned strip coil (e.g., the latter half 313b described later), the aforementioned plurality of straight portions are respectively inserted into the aforementioned plurality of comb-shaped grooves; and the aforementioned guide member has a shaping portion (e.g., shaping portion 42 described later), which, in the former half of the rotational transport of the aforementioned strip coil (e.g., the former half 313a described later), while holding the aforementioned side end of the aforementioned strip coil, causes... The aforementioned strip coil is shaped into an arc along the outer periphery of the aforementioned coil winding fixture, and has at least a raised pressing portion (e.g., the raised pressing portion 4cp described later) on the aforementioned shaped portion. The raised pressing portion is provided in a circumferential manner on the inner periphery side of the aforementioned guide member in such a way that it slides into contact with a stable stacked portion of the aforementioned strip coil (e.g., the stable stacked portion SLP described later) in which the difference in the number of coil stacks will not be locally generated in the bending portion from the aforementioned straight portion to the aforementioned side end.

[0013] (2) Optionally, according to the coil forming apparatus described in (1) above, the aforementioned guide member is configured as an outer peripheral guide member (e.g., the outer peripheral guide member 401 described later) having an inner peripheral surface side curvature along the outer periphery of the aforementioned coil winding fixture, and the aforementioned protruding pressing portion is provided on the inner peripheral surface of the aforementioned outer peripheral guide member.

[0014] (3) A coil forming method, wherein a strip coil (e.g., strip coil 100 described later) is wound onto a coil winding fixture (e.g., coil winding fixture 2 described later) to form a wound state, the strip coil having a plurality of straight portions (e.g., straight portions 102 described later) and side ends (e.g., side ends 103 described later) disposed at both ends of the plurality of straight portions, the coil winding fixture having a plurality of comb-shaped grooves (e.g., comb-shaped grooves 23 described later) on its outer periphery into which the plurality of straight portions can be inserted respectively, the coil forming method comprising: a rotational conveying step, wherein the strip coil is rotated and conveyed along at least a portion of the outer periphery of the coil winding fixture; and a guiding step, wherein the aforementioned side ends of the strip coil are guided into an arc shape along the outer periphery of the coil winding fixture using guide members (e.g., guide members 4 described later) disposed near both ends of the axial direction of the coil winding fixture respectively. In the latter half of the rotary transport of the strip coil (e.g., the latter half 313b described later), the aforementioned plurality of straight portions are respectively inserted into the aforementioned plurality of comb-shaped grooves (e.g., comb-shaped groove 23 described later); and the aforementioned guiding step includes a shaping step (e.g., a step performed in the shaping section 42 described later), wherein the shaping step is performed in the first half of the rotary transport of the strip coil, while the aforementioned side end of the strip coil is clamped, to shape the strip coil into an arc shape along the outer periphery of the aforementioned coil winding fixture. The shaping step is performed by using a circumferentially protruding ridge pressing portion (e.g., ridge pressing portion 4cp described later) on the inner periphery of the aforementioned guiding member to press the stable stacked portion (e.g., stable stacked portion SLP described later) of the strip coil where the difference in the number of coil stacks does not locally occur at the bend from the aforementioned straight portion to the aforementioned side end, while making sliding contact.

[0015] (The effect of the invention)

[0016] According to the coil forming apparatus described in (1) above, the guiding member guides the strip coil in such a way that, while contacting the aforementioned side end, it guides the strip coil into an arc shape along the outer periphery of the aforementioned coil winding fixture, and in the latter half of the rotational transport of the strip coil, the aforementioned plurality of straight portions are respectively inserted into the aforementioned plurality of comb-shaped grooves. In this guidance, at least the guiding portion of the aforementioned shaping portion, when shaping the strip coil into an arc shape along the outer periphery of the aforementioned coil winding fixture, has a circumferentially protruding pressing portion on the inner periphery side of the guiding member abutting against its stable stacking portion relative to the strip coil. The stable stacking portion is the portion of the strip coil from the straight portion to the side end where the bending portion does not locally produce a difference in the number of coil layers. Therefore, even in areas with unstable stacking, where there are local differences in the number of stacked coils, there is no difference in the number of coil stacks at the contact point of the convex pressing part. Thus, winding characteristics can be uniformly imparted without the so-called scattering where adjacent coil conductors become inconsistent. This allows the strip coil to be shaped into a winding state with high precision and smoothness.

[0017] According to the coil forming apparatus described in (2) above, the guide member is configured as an outer peripheral guide member having an inner peripheral surface side curvature along the outer periphery of the aforementioned coil winding fixture, and the aforementioned protruding pressing portion is provided on the inner peripheral surface of the aforementioned outer peripheral guide member. Therefore, the protruding pressing portion can be positioned to press while making sliding contact with a stable stacked portion that will not locally generate a difference in the number of coil layers.

[0018] According to the coil forming method described in (3) above, in at least the shaping step of the guiding step, when the shaping part deforms the strip coil into an arc shape along the outer periphery of the aforementioned coil winding fixture, the convex pressing part protruding along the circumferential direction on the inner periphery side of the guiding member slides into contact with the stable stacked portion of the strip coil while pressing it to shape it. The stable stacked portion is the part of the strip coil where the bending portion connecting the straight portion to the side end does not locally produce a difference in the number of coil stacks. Therefore, even in the unstable stacked portion, where there is a local difference in the number of stacked coils in the strip coil, there is no difference in the number of coil stacks at the contact portion of the convex pressing part. Therefore, winding characteristics can be uniformly imparted without the scattering of the coil conductor arrangement, thereby forming the strip coil into a winding state with high precision and smoothness.

[0019] Furthermore, both the coil forming apparatus described in (1) and (2) above, and the coil forming method described in (3) above, are based on the premise of using coils pre-formed as a series of strip coils as coils assembled on the stator. Currently, the mainstream method for assembling the coil in the stator slots is to divide the coil into multiple segments for forming, insert them into the slots, and then weld the ends of the coils. In this general method, high-purity copper is required for the coil to withstand the heat treatment at the welding points. In contrast, the present invention does not require heat treatment, therefore recycled copper containing impurities can be used, contributing to the recycling of resources. Attached Figure Description

[0020] Figure 1 This is a side view illustrating one embodiment of the coil forming apparatus of the present invention.

[0021] Figure 2 From Figure 1 Observation in direction A Figure 1 A diagram of the coil forming apparatus shown.

[0022] Figure 3 From Figure 1 Observation from direction B in Figure 1 A diagram of the coil forming apparatus shown.

[0023] Figure 4 This is a perspective view illustrating one embodiment of a coil winding fixture.

[0024] Figure 5 It is a perspective view of the control section of the coil conveying mechanism.

[0025] Figure 6 It is a drawing from Figure 5 A perspective view of the section component of the coil delivery mechanism, viewed from the opposite side.

[0026] Figure 7 It is a three-dimensional diagram showing the state in which two components are connected to each other.

[0027] Figure 8 yes Figure 1 Enlarged view of part E in the image.

[0028] Figure 9 yes Figure 1 Enlarged view of section C.

[0029] Figure 10 It is a cross-sectional view illustrating the use of a guide component to guide a strip coil in an arc shape to a coil winding fixture.

[0030] Figure 11 yes Figure 1 Enlarged cross-sectional view of part D in the image.

[0031] Figure 12 It is a partial enlarged view showing the multiple windings of the strip coil onto the coil winding fixture.

[0032] Figure 13 This explains the formation in Figure 10 A diagram showing the positional relationship between the raised pressing part on the guide component and the strip coil.

[0033] Figure 14 It is to observe and explain from other perspectives. Figure 13 A diagram showing the positional relationship between the raised pressing part and the strip coil.

[0034] Figure 15 It is a magnified drawing Figure 13 The image shows the area near the contact point between the raised pressing part and the strip coil.

[0035] Figure 16A It is an explanation by means of Figure 13 The diagram shows the pressing effect of the raised pressing part on the strip coil.

[0036] Figure 16B In the context of Figure 16A The diagram illustrates the pressing action of a general guide component on a strip coil in the comparison.

[0037] Figure 17 It is a three-dimensional diagram showing the state of a strip coil being formed into a wound state on a coil winding fixture. Detailed Implementation

[0038] The embodiments of the present invention will be described below. Figure 1 As shown, the coil forming apparatus 1 of this embodiment includes: a coil winding fixture 2; a coil conveying mechanism 3 for conveying a strip coil 100 along the outer periphery of the coil winding fixture 2; and a pair of guide members 4 for guiding the strip coil 100 conveyed by the coil conveying mechanism 3 to wind it onto the coil winding fixture 2.

[0039] (Strip coil)

[0040] like Figure 3 As shown, the strip coil 100 is formed from a flat conductor 101 with a roughly rectangular cross-sectional shape, shaped into a long, wavy strip. The flat conductor 101 is formed, for example, from a metal with high conductivity such as copper or aluminum.

[0041] The coil conductor in the strip coil 100 includes a plurality of straight portions 102 and a plurality of side ends 103. The straight portions 102 are inserted into slots provided on the inner circumference of a stator core (not shown), and extend generally in a straight line in the same direction, arranged in parallel at fixed intervals. The side ends 103 are respectively disposed near the side ends of the strip coil 100 closer to the straight portions 102 than the side ends, specifically disposed at both ends in the extending direction of the straight portions 102. The side ends 103 constitute coil end portions, which alternately connect one end of adjacent straight portions 102 to each other in a mountain-shaped configuration, and protrude from the slots along the axial direction of the stator core when the strip coil 100 is installed in the slots of the stator core.

[0042] The strip coil 100 of this embodiment is formed into a long strip by bending six flat conductors 101 into waveforms by bending multiple straight portions 102 and multiple side ends 103 respectively. The straight portions 102 are arranged parallel to each other at fixed intervals, and the side ends 103 are staggered and overlapped with respect to the spacing of the straight portions 102. The straight portions 102 of the strip coil 100 are extended in the thickness direction of the strip coil 100 by folding the flat conductors 101 back midway. Figure 3 Multiple coils overlap in the direction perpendicular to the paper surface. The strip coil 100 of this embodiment has a length of four turns wound on the coil winding fixture 2 described later.

[0043] (Coil winding fixture)

[0044] like Figure 4 As shown, the coil winding fixture 2 has: a generally cylindrical fixture body 21; a plurality of comb-shaped portions 22 that radiate outwards along the outer periphery of the fixture body 21; a plurality of comb-shaped grooves 23 disposed between adjacent comb-shaped portions 22, 22 in the circumferential direction; and a shaft hole 24 that opens at the center of the fixture body 21. The comb-shaped portions 22 and comb-shaped grooves 23 are respectively disposed at both ends of the fixture body 21 in the axial direction. The comb-shaped portions 22 and comb-shaped grooves 23 at one end of the fixture body 21 are phase-aligned with the comb-shaped portions 22 and comb-shaped grooves 23 at the other end. The coil winding fixture 2 of this embodiment has 72 comb-shaped grooves 23 at each end of the fixture body 21 in the axial direction. The number of these comb-shaped grooves 23 is consistent with the number of grooves on the stator core on which the strip coil 100 is mounted.

[0045] The distance between the comb-shaped portion 22 and comb-shaped groove 23 at one end of the fixture body 21 and the comb-shaped portion 22 and comb-shaped groove 23 at the other end is approximately equal to the length of the straight portion 102 of the strip coil 100 in the extending direction. Therefore, the straight portion 102 of the strip coil 100 can be accommodated in the comb-shaped groove 23 at one end and the comb-shaped groove 23 at the other end of the fixture body 21.

[0046] The coil winding fixture 2 is formed such that the outer diameter of the coil winding fixture 2, defined by the position of the front end of the comb portion 22, is below the inner diameter of the stator core, so that it can be inserted into the inner side of the stator core. The coil winding fixture 2 is disposed at a specific location on the coil forming apparatus 1 and is configured to be able to wind the coil around the shaft hole 24 under the drive of a motor (not shown). Figure 1 Rotate in the direction of d1 as indicated by the arrow in the image.

[0047] (Coil conveying mechanism)

[0048] The coil conveying mechanism 3 rotates to convey the strip coil 100 along at least a portion of the outer periphery of the coil winding fixture 2. Specifically, as... Figure 1 and Figure 2 As shown, the coil conveying mechanism 3 has: a pair of conveying tracks 31 that form a conveying path for the strip coil 100; and a conveying body 32 that holds the strip coil 100 and conveys it along the conveying tracks 31.

[0049] The conveying track 31 is formed of a metal strip and is arranged parallel to each other in the width direction of the coil forming device 1, at intervals approximately equal in length to the straight portions 102 of the strip coil 100. For example... Figure 2 As shown, the interval between a pair of conveying tracks 31 is approximately equal to the axial distance between the comb-shaped portion 22 and the comb-shaped groove 23 of the coil winding fixture 2.

[0050] The conveyor track 31 has a pair of parallel linear conveying sections 311 and 312 forming a straight conveying path, and a rotary conveying section 313 connecting the ends of the linear conveying sections 311 and 312 in an arc shape, thereby forming a transverse U-shaped conveying path. The conveyor track 31 is configured to surround the coil winding fixture 2 inside the U-shaped portion, so that the rotary conveying section 313 travels along the outer periphery of the coil winding fixture 2. Figure 2 As shown, on the surfaces of a pair of conveying tracks 31 facing each other, a guide groove 314 extending along the total length of the conveying track 31 is provided. The guide groove 314 forms the movement path of the conveyor body 32, which will be described later.

[0051] In this embodiment, the rotary conveying section 313 of the coil conveying mechanism 3 is formed within approximately half of the outer periphery of the coil winding fixture 2. The rotary conveying section 313 has a front half 313a serving as the inlet side of the strip coil 100 and a rear half 313b serving as the output side of the strip coil 100. The front half 313a is formed within approximately half of the front half of the rotary conveying section 313. The rear half 313b is formed within approximately half of the rear half of the rotary conveying section 313. However, the rotary conveying section 313 only needs to be configured to rotary convey the strip coil 100 along at least a portion of the outer periphery of the coil winding fixture 2.

[0052] The conveyor body 32 extends in a long strip along the conveyor track 31 and is configured to move along the conveyor track 31 between a pair of conveyor tracks 31. The conveyor body 32 has at least a length corresponding to the total length of the strip coil 100, and by moving along the conveyor track 31 while holding the straight portion 102 of the strip coil 100 on the upper surface, it rotates and conveys the strip coil 100 along the outer periphery of the coil winding fixture 2.

[0053] like Figure 1 and Figure 3 As shown, the conveyor 32 is composed of multiple segmented components 33 with the same structure arranged in a stacked manner along the length direction of the strip coil 100. Figure 5 , Figure 6 and Figure 7 As shown, the segment member 33 has a metal segment member body 331 with a generally rectangular plate shape, and a pair of guide protrusions 332 protruding laterally from both ends of the segment member body 331 in the width direction from the lower end. In this embodiment, the guide protrusions 332 are each composed of rotatable rollers, but they can also be simple protrusions. Furthermore, regarding the orientation of the segment member 33, Figure 5 , Figure 6 and Figure 7 In the diagram, the X direction is defined as the width direction, the Y direction as the thickness direction, and the Z direction as the height direction. Regarding the height direction, the top direction in the diagram is defined as "up," and the bottom direction is defined as "down."

[0054] The segment member body 331 has a thickness approximately equal to the gap between adjacent straight portions 102, 102 in the longitudinal direction of the strip coil 100. A pair of first gripping claws 333 are provided protruding along the height direction from the upper end face 331a of the segment member body 331. The first gripping claws 333 have a thickness approximately half the thickness of the segment member body 331. The thickness of the first gripping claws 333 is approximately equal to the gap between adjacent straight portions 102, 102 of the strip coil 100. The first gripping claws 333 are positioned on the upper end face 331a at one end biased towards the thickness direction of the segment member body 331. The pair of first gripping claws 333 are spaced apart and separately disposed at both ends of the segment member body 331 in the width direction.

[0055] On the upper end face of the first gripping claw 333, there are engagement grooves 333a that engage with the front end of the comb teeth 22 of the coil winding fixture 2. More specifically, as... Figure 4 As shown, engagement portions 22a are provided at the front end of the comb portion 22 of the coil winding fixture 2. Engagement grooves 333a have positions and shapes that can engage with engagement portions 22a of the coil winding fixture 2.

[0056] The first gripper 333 has a conical surface 333b on the opposite side of the side with the upper end surface 331a. By means of the conical surface 333b, the first gripper 333 is formed to be slightly narrower at the front end as it moves away from the joint member body 331.

[0057] Between a pair of first gripping claws 333, a rectangular recess 334 is provided along the height direction of the segment member body 331. The recess 334 extends approximately halfway along the height direction of the segment member body 331, starting from the upper end face 331a. Similar to the first gripping claws 333, the depth of the recess 334 in the thickness direction of the segment member body 331 is approximately half the thickness of the segment member body 331.

[0058] A rectangular protrusion 335 is provided on one side 331b of the segment member body 331. The protrusion 335 is configured to protrude in a block shape from the side 331b opposite to the side where the first gripping claw 333 is located, in the thickness direction of the segment member body 331, in a direction perpendicular to the side 331b. The protrusion 335 is positioned above approximately half the distance along the height direction of the segment member body 331. The height of the protrusion 335 in the height direction of the segment member body 331 is approximately equal to the height of the recess 334. The thickness of the protrusion 335 in the thickness direction of the segment member body 331 is approximately equal to the depth of the recess 334.

[0059] A second gripping claw 336 is provided at the upper end of the protrusion 335. Similar to the first gripping claw 333, the second gripping claw 336 protrudes upwards more than the upper end face 331a of the segment member body 331. Also similar to the first gripping claw 333, the thickness of the second gripping claw 336 is approximately equal to the gap between adjacent straight portions 102, 102 of the strip coil 100. Since the second gripping claw 336 has the same width as the protrusion 335, therefore... Figure 7 As shown, when the two segment components 33, 33 are overlapped in a consistent orientation, a second gripping claw 336 of the other segment component 33 is disposed between a pair of first gripping claws 333, 333 of one segment component 33.

[0060] The second gripping claw 336 has a conical surface 336a on the side with the upper end surface 331a and the opposite side. With the help of the conical surface 336a, the second gripping claw 336 is formed to be slightly narrower at the front end as it moves away from the joint member body 331.

[0061] like Figure 7 As shown, the multiple segment components 33 are aligned such that the first gripping claw 333 and the second gripping claw 336 point in the same direction, and overlap such that the protrusions 335 of the segment components 33 are housed within the recesses 334 of the adjacent segment components 33. Thus, the adjacent segment components 33, 33 overlap each other closely.

[0062] Near the root of the first gripping claw 333, at a position approximately level with the upper end face 331a of the segment member body 331, a through hole 337a extending across the width of the segment member 33 is provided. Additionally, near the root of the second gripping claw 336, at a position approximately level with the upper end face 331a of the segment member body 331, a through hole 337b extending across the width of the protrusion 335 is provided. Figure 7 As shown, when two segment components 33, 33 are overlapped, a shaft component 338 is inserted through the interconnected through holes 337a and 337b. Thus, multiple segment components 33 are connected so that the lower end side, which is provided with guide protrusions 332, can rotate (rock) along the length direction of the conveyor body 32 with the shaft component 338 as the axis of rotation, thereby forming a long strip-shaped conveyor body 32.

[0063] In the conveyor body 32, between the first gripping claws 333, 333 and the second gripping claws 336, 336 of adjacent section components 33, 33, such as Figure 3 , Figure 7 , Figure 8 and Figure 9As shown, a holding groove 321 is formed to hold the straight portion 102 of the strip coil 100. The upper end face 331a of the section member body 331 faces the bottom of the holding groove 321. The holding groove 321 has a groove width capable of receiving the straight portion 102 of the strip coil 100. The groove width of the holding groove 321 is approximately equal to the circumferential width of the comb-shaped grooves 23 of the coil winding fixture 2. The spacing of the holding grooves 321 in the length direction of the conveyor body 32 is approximately equal to the spacing of the comb-shaped grooves 23 in the circumferential direction of the coil winding fixture 2. Therefore, if the engagement groove 333a engages with the engagement portion 22a, then as Figure 8 As shown, the holding groove 321 of the conveyor 32 and the comb-shaped groove 23 of the coil winding fixture 2 are connected in the radial direction of the coil winding fixture 2.

[0064] The conveyor body 32 is configured such that each guide protrusion 332 of the segment component 33 is slidably housed in the guide groove 314 of the conveyor track 31, and protrudes towards the inner side of the U-shaped conveyor track 31. Furthermore, as... Figure 8 As shown, the conveyor 32 is configured such that when it reaches directly below the coil winding fixture 2, it engages with the engagement portion 22a of the coil winding fixture 2 via the engagement groove 333a of the segment member 33. This allows it to move synchronously along the d2 direction with the rotation of the coil winding fixture 2 in the d1 direction. When the conveyor 32 moves in an arc along the rotating conveyor portion 313 of the conveyor track 31, it rotates with the shaft member 338 based on the portion holding the straight portion 102 (i.e., the first gripping claw 333 and the second gripping claw 336), with the guide protrusions 332 of adjacent segment members 33, 33 moving away from each other. Therefore, it can move smoothly.

[0065] like Figure 3 , Figure 8 and Figure 9 As shown, the conveyor body 32, slidably disposed on the conveyor track 31, holds the strip coil 100 by inserting the first gripping claw 333 and the second gripping claw 336 into the gap between adjacent straight portions 102, 102 in the longitudinal direction of the strip coil 100, and housing the straight portions 102 in the gripping groove 321. Therefore, the conveyor body 32 can convey the strip coil 100 without misaligning the straight portions 102 and maintaining a fixed interval. Figure 2 and Figure 3 As shown, the side ends 103 of the strip coil 100 are configured to extend to both sides in the moving direction of the conveyor body 32. Furthermore, in Figure 1 The illustration of the strip coil 100 held by the conveyor 32 is omitted.

[0066] (Guide component)

[0067] like Figure 1As shown, the guide member 4 is made of a metal strip plate, formed in a roughly U-shape laterally along the rotating conveyor section 313 of the conveyor track 31. The guide member 4 is positioned such that it clamps the coil winding fixture 2, with the inner side of the U-shaped portion facing the coil winding fixture 2 along the axial direction of the coil winding fixture 2. Figure 1 The vertical direction of the paper surface in the middle, Figure 2 Near both ends (in the left and right directions) and fixed on the conveyor track 31.

[0068] The guide member 4 has: an inlet end 4a for inleting the side end 103 of the strip coil 100 conveyed by the conveyor 32; an outlet end 4b for outleting the side end 103 of the strip coil 100; and an inner wall surface 41 for guiding the side end 103 from the inlet end 4a to the outlet end 4b. The inner wall surface 41 from the inlet end 4a to the outlet end 4b is formed by a curved surface that is smoothly and continuously curved along approximately half of the outer periphery of the coil winding fixture 2.

[0069] In detail, the guide component 4 includes an outer peripheral guide component 401 whose inner wall surface 41 is along the curvature of the outer periphery of the coil winding fixture 2. A raised pressing portion 4cp is circumferentially protruding from the inner wall surface 41 of the outer peripheral guide component 401. Figure 10 , Figure 11 , Figure 12 In the diagram, the portion corresponding to the protruding base of the raised pressing portion 4cp is shown in a dashed line, appearing arc-shaped in side view. The inner circumferential surface of the raised pressing portion 4cp, extending in the circumferential direction, presses against the side end 103 of the strip coil 100 while making sliding contact. The guide member 4, during the rotational transport of the strip coil 100 by the rotary transport unit 313, brings the side end 103 introduced from the inlet end 4a into contact with the raised pressing portion 4cp on the inner wall surface 41, thereby smoothly guiding the entire strip coil 100 into an arc shape along the outer periphery of the coil winding fixture 2.

[0070] The curvature of the raised pressing portion 4cp in the arc-shaped inner wall surface 41 of the guide component 4 is formed such that it gradually increases in curvature as it moves from the inlet end 4a towards the outlet end 4b. More specifically, as... Figure 10As shown, the raised pressing portion 4cp of the inner wall surface 41 at the inlet end 4a is positioned slightly radially outward from the outer periphery of the coil winding fixture 2. However, the raised pressing portion 4cp of the inner wall surface 41 gradually and smoothly narrows in diameter as it moves from the inlet end 4a towards the output end 4b. The raised pressing portion 4cp of the inner wall surface 41 at the output end 4b is positioned radially inward from the outer periphery of the coil winding fixture 2. Therefore, as the strip coil 100 moves from the front half 313a of the rotating conveyor 313 towards the rear half 313b, the raised pressing portion 4cp of the inner wall surface 41 in the guide member 4 presses against the side end 103 of the strip coil 100 while making sliding contact with it, guiding the strip coil 100 to gradually curl into an arc shape with a diameter smaller than the outer diameter of the coil winding fixture 2.

[0071] As the strip coil 100 moves from the front half 313a of the rotating conveyor 313 towards the rear half 313b, it is guided by the protruding pressing portion 4cp of the inner wall surface 41 of the guide member 4, and thus gradually pressed towards the coil winding fixture 2. As a result, the straight portion 102, held by the conveyor 32, rises from the holding groove 321 and is forcibly disengaged, gradually moving towards the interior of the comb-shaped groove 23 of the coil winding fixture 2. Since the output end 4b of the guide member 4, i.e., the terminal portion of the protruding pressing portion 4cp, is located radially inward than the outer periphery of the coil winding fixture 2, the straight portion 102 is fully inserted into the comb-shaped groove 23 of the coil winding fixture 2. Subsequently, the strip coil 100 is wound onto the coil winding fixture 2 by the rotation of the coil winding fixture 2. Furthermore, in Figure 10 and Figure 12 The illustration of the conveyor 32 is omitted, and the strip coil 100 is shown in a simplified form.

[0072] Furthermore, the guide member 4 is not limited to a structure with a continuous inner wall surface 41 extending throughout the entire rotary conveyor section 313, as in this embodiment. Although not shown, the guide member 4 may, for example, be a structure in which multiple guide rollers are arranged along the rotary conveyor section 313. However, from the viewpoint that the strip coil 100 can be continuously guided to the comb-shaped groove 23 of the coil winding fixture 2, and that the straight portion 102 can be smoothly inserted into the comb-shaped groove 23, the guide member 4 preferably has an inner wall surface 41 that contacts the side end 103 in the rear half 313b of the rotary conveyor section 313. From the viewpoint that the strip coil 100 can be smoothly guided into an arc shape throughout the rotary conveying section 313 and the straight portion 102 can be smoothly inserted into the comb-shaped groove 23 of the coil winding fixture 2, the guide member 4 preferably has an inner wall surface 41 as in this embodiment, the inner wall surface 41 having the above-mentioned protruding pressing portion 4cp, which contacts the side end 103 with the wall surface throughout the rotary conveying section 313.

[0073] like Figure 1and Figure 2 As shown, on the inlet end 4a side of the guide member 4, there is a pair of shaping portions 42. These shaping portions 42 are used to forcibly shape the strip coil 100 introduced into the rotary conveyor 313 by bending it into an arc shape along the outer periphery of the coil winding fixture 2. In the guide member 4, the range of the shaping portions 42 is within the front half 313a of the rotary conveyor 313. Specifically, the shaping portions 42 can be provided, for example, from the inlet end 4a of the guide member 4, covering approximately 1 / 2 to approximately 3 / 4 of the front half 313a of the rotary conveyor 313. The protruding pressing portion 4cp in the guide member 4 is provided at least throughout the range of the shaping portions 42, but in this embodiment, the protruding pressing portion 4cp is provided throughout the total length of the guide member 4, i.e., the entire rotary conveyor 313.

[0074] The shaping part 42 shapes the strip coil 100 by means of the following: the protruding pressing part 4cp on the inner circumference of the guide member 4 presses the rotating and conveyed strip coil 100 while making sliding contact, thereby giving the strip coil 100 a bending characteristic that conforms to the curvature of the guide member 4. Specifically, for the stable stacked portion SLP of the strip coil 100 where the bending portion from the straight portion 102 of the strip coil 100 to the side end 103 does not locally produce a difference in the number of coil layers, the protruding pressing part 4cp presses it while making sliding contact, thereby giving it a bending characteristic.

[0075] Here, in Figure 13 It shows Figure 10 The positional relationship between the raised pressing portion 4cp formed on the outer peripheral guiding member 401 of the guiding member 4 and the strip coil 100. Additionally, in Figure 14 The text is a jumbled collection of phrases and sentences, seemingly from different perspectives. A coherent translation isn't possible without Figure 13 The positional relationship between the raised pressing part 4cp and the strip coil 100. Figure 13 In the diagram, one end 103 of the strip coil 100, which is actually curved in an arc shape perpendicular to the plane of the paper, is shown unfolded in a plane. The bend in the coil conductor of the strip coil 100, which bends from each straight portion 102 toward that end 103, becomes a stable stacking portion SLP of the strip coil 100 that does not locally produce a difference in the number of coil layers.

[0076] The shaping part 42 is composed of the protruding pressing part 4cp of the outer peripheral guide member 401 and the inner peripheral guide member 421 in the guide member 4. The inner peripheral guide member 421 is formed to be smoothly bent into an arc shape according to the curvature of the protruding pressing part 4cp. The shaping part 42 is respectively arranged to clamp the coil winding fixture 2 from both ends in the axial direction. In the shaping part 42, a shaping groove 422 for clamping the side end 103 is formed between the protruding pressing part 4cp of the outer peripheral guide member 401 and the inner peripheral guide member 421. The protruding pressing part 4cp of the outer peripheral guide member 401 in the shaping part 42 contacts and supports the radially outer surface of the side end 103 of the strip coil 100, and the inner peripheral guide member 421 contacts and supports the radially inner surface of the side end 103 of the strip coil 100.

[0077] The shaping section 42 forcibly deforms the strip coil 100 into an arc shape by simultaneously guiding it into the shaping groove 422 and clamping it at the side end 103 of the strip coil 100, which is introduced to the guide member 4's inlet end 4a. Thus, the strip coil 100 is formed into an arc shape during the initial introduction of the rotary conveyor 313 before being wound into the coil winding fixture 2, thereby suppressing the force that would otherwise cause it to elastically return to a flat shape during the subsequent guidance by the inner wall surface 41 of the guide member 4 into an arc shape. Therefore, the strip coil 100 is guided into an arc shape by the guide member 4, thereby smoothly and precisely forming a generally cylindrical winding state.

[0078] Figure 15 The enlarged image shows Figure 13 The protruding pressing portion 4cp is located near the contact area between the strip coil 100 and the contact portion of the strip coil 100. From the straight portion 102, the holding portion of the strip coil 100 held by the conveyor 32 extends towards the bend at the side end 103, creating a stable stacked portion SLP of the strip coil 100 that does not locally produce differences in the number of coil layers. The protruding pressing portion 4cp, which is provided on the outer peripheral guide member 401, is arranged such that the flat portion of its protruding end faces this stable stacked portion SLP. The protruding pressing portion 4cp presses against the stable stacked portion SLP of the strip coil 100 while making sliding contact.

[0079] Next, while comparing Figure 16A and Figure 16B On the one hand, it is explained that the convex pressing part 4cp makes sliding contact with the stable stacked part SLP of the strip coil 100, and presses on the sliding contact position. Figure 16A The diagram shows a case where the raised pressing portion 4cp is positioned at a point where it makes sliding contact with the stable stacked portion SLP of the strip coil 100. Figure 16B The convex pressing part 4cp is shown to be set with the... Figure 16A The position deviates from the specified position. (Refer to...) Figure 16AIt is easy to understand that in the stable stacked portion SLP, no difference in the number of coil stacks occurs at any position in the circumferential direction along the rotational transport of the strip coil 100.

[0080] Right now, Figure 16A In this case, the number of coil layers in the stable stacked portion SLP is two, which is stable. Therefore, the raised pressing portion 4cp slides in equal contact with the outer periphery of each coil conductor of the strip coil 100, pressing its sliding contact portion towards the inner periphery. Thus, the coil conductors are orderly pressed into the comb-shaped groove 23 of the coil winding fixture 2 without causing stacking disorder.

[0081] Figure 16B In this case, since the raised pressing portion 4cp and the stable stacked portion SLP of the strip coil 100 are not facing each other, the number of coil layers will differ depending on the position of the strip coil 100 along the circumferential direction of rotational transport. That is, depending on the circumferential position, there is a step difference between the portion with one coil layer and the portion with two layers, and a gap VS is generated at the portion with the step difference. Therefore, it prevents the raised pressing portion 4cp from making equal sliding contact with the outer peripheral side of each coil conductor of the strip coil 100, thereby locally creating portions where the coil conductors cannot be pressed inward.

[0082] (Coil forming method)

[0083] Next, the method for forming the strip coil 100 into a generally cylindrical wound state using the coil forming apparatus 1 will be described.

[0084] First, a coil winding fixture 2 is configured to rotate via a motor (not shown) inside the U-shaped portion of the conveyor track 31 of the coil forming apparatus 1. After the coil winding fixture 2 is mounted on the coil forming apparatus 1, a pre-formed, wavy strip coil 100 is supplied to a conveyor body 32, located on the lower side of the conveyor track 31, by a coil supply device (not shown) or by an operator. The strip coil 100 is held by the conveyor body 32 by inserting the first gripping claw 333 and the second gripping claw 336 of each section 33 of the conveyor body 32 into the gap between adjacent straight sections 102, 102, and by housing the straight sections 102 in the gripping grooves 321.

[0085] Subsequently, the conveyor body 32 holding the strip coil 100 is pressed by a conveyor body pressing device (not shown) or an operator, thereby moving along the linear conveyor section 311 toward the coil winding fixture 2 in such a way that the engagement groove 333a of the section component 33 engages with the engagement part 22a of the coil winding fixture 2. After the engagement groove 333a and the engagement part 22a are engaged directly below the coil winding fixture 2, if the coil winding fixture 2 is driven to rotate in the d1 direction, the conveyor body 32 and the rotation of the coil winding fixture 2 are synchronized and move along the conveyor track 31 in the d2 direction, thereby rotating and conveying the strip coil 100 along the outer periphery of the coil winding fixture 2 (rotational conveying step).

[0086] If the conveyor 32 reaches the rotary conveyor 313, the side end 103 of the strip coil 100 is first guided from the inlet end 4a of the guide member 4 into the shaping groove 422 of the shaping section 42. Following this introduction, the side end 103 is rotary conveyed while being held between the protruding pressing portion 4cp, which protrudes circumferentially from the inner wall surface 41 of the outer peripheral guide member 401, and the inner peripheral guide member 421. During this rotary conveying, for the strip coil 100, a stable stacking portion SLP, where no local difference in the number of coil layers occurs at the bend connecting its straight portion 102 to the side end 103, is pressed and shaped while the protruding pressing portion 4cp slides into contact with it. At the stable stacking portion SLP, no difference in the number of coil layers occurs at any position in the circumferential direction of the rotary conveying of the strip coil 100. Therefore, the raised pressing portion 4cp is evenly contacted and slides in contact with the outer periphery of the side end portion 103 of the strip coil 100. Thus, the strip coil 100 is forcibly deformed and shaped in a manner that bends into an arc shape along the shaping groove 422 (the shaping step in the guiding step).

[0087] As the coil winding fixture 2 rotates, the strip coil 100 of the shaping part 42 is rotated and conveyed along the inner wall surface 41 of the guide member 4 and along at least a portion of the outer periphery of the coil winding fixture 2, specifically approximately half of the outer periphery of the coil winding fixture 2, while being guided in a manner that gradually curls into an arc shape.

[0088] As the front half 313a of the rotary conveyor 313 approaches the rear half 313b, the curvature of the raised pressing portion 4cp in the inner wall surface 41 of the outer peripheral guide member 401 gradually increases. Therefore, the side end 103 of the strip coil 100 is pressed by the raised pressing portion 4cp in a manner that gradually narrows towards the radially inward direction. As a result, the strip coil 100 is wound into a shape with a diameter smaller than the outer diameter of the coil winding fixture 2.

[0089] The side end 103, pressed by the protruding pressing portion 4cp in the inner wall surface 41 of the outer peripheral guide member 401, gradually disengages from the holding groove 321 toward the comb-shaped groove 23 of the coil winding fixture 2 as the strip coil 100 approaches the output end 4b of the guide member 4. After completely disengaging from the holding groove 321, the straight portion 102 is pressed by the protruding pressing portion 4cp while... Figure 10 As shown, they are respectively inserted into the comb-shaped grooves 23 of the coil winding fixture 2 that are connected to the holding groove 321 (guiding step).

[0090] In the aforementioned guiding step, the raised pressing portion 4cp presses against the stable stacking portion SLP of the strip coil 100 while making sliding contact. At the stable stacking portion SLP, no difference in the number of coil stacks occurs at any position along the circumferential direction of the strip coil 100 during rotational transport. Therefore, the raised pressing portion 4cp makes equal sliding contact with the outer periphery of each coil conductor of the strip coil 100, pressing its sliding contact portion towards the inner periphery. Thus, the coil conductors are orderly pressed into the comb-shaped groove 23 of the coil winding fixture 2 without causing stacking disorder. Subsequently, as the coil winding fixture 2 rotates, the strip coil 100 is wound onto the coil winding fixture 2 and output from the output end 4b of the guiding member 4.

[0091] If the entire conveyor body 32 finishes moving along the conveyor track 31, the strip coil 100 is inserted into the comb-shaped groove 23 in a stacked manner via the straight portion 102, and as... Figure 12 As shown, it is wound multiple times by winding the coil around the jig 2 four times. Thus, as... Figure 17 As shown, the strip coil 100 can be easily formed into a generally cylindrical wound state. Since the straight portion 102 of the wound strip coil 100 is housed within the comb-shaped groove 23, misalignment is impossible. Therefore, the strip coil 100 can stably maintain a generally cylindrical wound state. Furthermore, the strip coil is not limited to being multiple-wound onto the coil winding fixture 2.

[0092] The coil forming apparatus 1 described above achieves the following effect: the coil forming apparatus 1 of this embodiment forms a strip coil 100 into a wound state, the strip coil 100 having a plurality of straight portions 102 and side ends 103 disposed at both ends of the plurality of straight portions 102.

[0093] The coil forming apparatus 1 includes: a coil winding fixture 2 having a plurality of comb-shaped grooves 23 on its outer periphery into which a plurality of straight portions 102 can be inserted respectively, and configured to wind a strip coil 100; a coil conveying mechanism 3 configured to rotatably convey the strip coil 100 along at least a portion of the outer periphery of the coil winding fixture 2; and a guide member 4 disposed near both ends of the coil winding fixture 2 in the axial direction, contacting the side end 103 while guiding the strip coil 100 into an arc shape along the outer periphery of the coil winding fixture 2, and in the rear half 313b of the rotary conveying part 313 for rotatably conveying the strip coil 100, the plurality of straight portions 102 are respectively inserted into the plurality of comb-shaped grooves 23.

[0094] The guide member 4 has a shaping part 42, which, in the state of holding the side end 103 of the side end 100 of the side end 313a of the side end 313a of the side end 313a of the side end 313a of the side end 313a of the side end 313a of the side end 313a of the side end 313a of the side end 313a of the side end 313a, shapes the side end 100 into an arc shape along the outer periphery of the side end 313a of the side end 313a.

[0095] The guide member 4 has at least one raised pressing portion 4cp in the shaping portion 42. The raised pressing portion 4cp protrudes circumferentially on the inner periphery of the guide member 4 in a manner that presses against the stable stacked portion SLP of the strip coil where no local difference in the number of coil layers occurs at the bend from the straight portion 102 to the side end 103, while making sliding contact. At the stable stacked portion SLP, no difference in the number of coil layers occurs at any position in the circumferential direction of the strip coil 100 during rotational transport.

[0096] Therefore, the raised pressing portion 4cp evenly contacts and slides against the outer periphery of the side end 103 of the strip coil 100. Consequently, the strip coil 100 can be forcibly deformed into an arc shape by bending along the shaping groove 422 without causing the adjacent coil conductors to become inconsistent or scattered. Thus, the strip coil 100 can be precisely and orderly shaped into a wound state.

[0097] In this embodiment, the guide member 4 is configured as an outer peripheral guide member 401 having an inner peripheral surface side curvature along the outer periphery of the coil winding fixture 2, and a raised pressing portion 4cp is provided protruding from the inner peripheral surface of the outer peripheral guide member 401. Therefore, the raised pressing portion 4cp can be positioned to press the stable stacked portion SLP, which does not locally generate differences in the number of coil layers, while making sliding contact.

[0098] The coil forming method described above achieves the following effects. Specifically, the coil forming method of this embodiment winds a strip coil 100 onto a coil winding fixture 2 to form a wound state. The strip coil 100 has multiple straight portions 102 and side ends 103 disposed at both ends of the multiple straight portions 102. The coil winding fixture 2 has multiple comb-shaped grooves 23 on its outer periphery into which the multiple straight portions 102 can be inserted. The coil forming method includes: a rotational conveying step, in which the strip coil 100 is rotated and conveyed along at least a portion of the outer periphery of the coil winding fixture 2; and a guiding step, in which the side ends 103 of the strip coil 100 are guided into an arc shape along the outer periphery of the coil winding fixture 2 using guide members 4 disposed near both ends of the axial direction of the coil winding fixture 2. In the latter half 313b of the rotary conveying of 0, multiple straight portions 102 are inserted into multiple comb-shaped grooves 23 respectively. This guiding step includes a shaping step (a step performed in the shaping section 42). The shaping step is performed in the first half of the rotary conveying of the strip coil 100, while the side end 103 of the strip coil 100 is clamped, to shape the strip coil 100 into an arc shape along the outer periphery of the coil winding fixture 2. This shaping step is performed by using a circumferentially protruding convex pressing portion 4cp on the inner periphery of the guide member 4 to press the stable stacked portion SLP of the strip coil 100, where no local difference in the number of coil layers occurs at the bend from the straight portion 102 to the side end 103, while making sliding contact. As a result, there is no difference in the number of coil layers at the contact portion of the convex pressing portion, so the winding characteristics can be uniformly imparted without the scattering of the coil conductor arrangement, thereby enabling highly efficient coil forming operations.

[0099] The embodiments of the present invention have been described above, but the present invention is not limited thereto. Within the scope of the present invention, appropriate changes to the details of the structure may be made. For example, in the above embodiment, a raised pressing portion 4cp is provided on the inner circumferential surface of the outer circumferential guide member 401 along the curvature of the outer circumference of the coil winding fixture 2 on the inner circumferential side, but a structure alternative to this may be used. That is, the outer circumferential guide member 401 itself may be configured to have a width corresponding to the stable stacked portion SLP of the strip coil 100, and configured to function as the raised pressing portion 4cp.

[0100] Figure Labels

[0101] 1: Coil forming device

[0102] 2: Coil winding fixture

[0103] 23: Comb-like grooves

[0104] 3: Coil conveying mechanism

[0105] 313: Rotary Conveyor Unit

[0106] 313a: First half

[0107] 313b: The latter half

[0108] 4: Guide components

[0109] 4cp: Raised bar pressing part

[0110] 41: Inner wall surface

[0111] 42: Shaping Section

[0112] 401: Peripheral guide components

[0113] 100: Strip coil

[0114] 102: Straight part

[0115] 103: Side end

[0116] SLP: Stable Stack-up

[0117] VS: Gap

Claims

1. A coil forming apparatus for forming a strip coil into a wound state, the strip coil having a plurality of straight portions and side ends disposed at both ends of the plurality of straight portions, the coil forming apparatus comprising: The coil winding fixture has multiple comb-shaped grooves on its outer periphery into which the aforementioned multiple straight portions can be inserted respectively, and is configured to wind the aforementioned strip coil. The coil conveying mechanism is configured to rotatably convey the aforementioned strip coil along at least a portion of the outer periphery of the aforementioned coil winding fixture; and, The guide components are respectively disposed near both ends of the aforementioned coil winding fixture along the axial direction. While contacting the aforementioned side ends, they guide the aforementioned strip coil into an arc shape along the outer periphery of the aforementioned coil winding fixture. Furthermore, in the latter half of the rotational transport of the aforementioned strip coil, the aforementioned plurality of straight portions are respectively inserted into the aforementioned plurality of comb-shaped grooves. Furthermore, the aforementioned guide member has a shaping portion, which, during the first half of the rotational transport of the aforementioned strip coil, while holding the aforementioned side end of the aforementioned strip coil, deforms the aforementioned strip coil into an arc shape along the outer periphery of the aforementioned coil winding fixture. At least the aforementioned shaping portion has a raised pressing portion, which slides in contact with a stable stacked portion of the aforementioned strip coil where a difference in the number of coil layers will not locally occur at the bend from the aforementioned straight portion to the aforementioned side end. This raised pressing portion protrudes circumferentially on the inner periphery of the aforementioned guide member. The aforementioned guide member is configured as an outer peripheral guide member having an inner peripheral surface side curvature along the outer periphery of the aforementioned coil winding fixture, and the aforementioned protruding pressing portion is provided on the inner peripheral surface of the aforementioned outer peripheral guide member.

2. A coil forming method, comprising winding a strip coil onto a coil winding fixture to form a wound state, the strip coil having a plurality of straight portions and side ends disposed at both ends of the plurality of straight portions, the coil winding fixture having a plurality of comb-shaped grooves on its outer periphery into which the plurality of straight portions can be inserted respectively, the coil forming method comprising: The rotary conveying step involves rotating and conveying the aforementioned strip coil along at least a portion of the outer periphery of the aforementioned coil winding fixture; and, In the guiding step, guide members respectively arranged near both ends of the aforementioned coil winding fixture along the axial direction are used to guide the aforementioned side ends of the aforementioned strip coil into an arc shape along the outer periphery of the aforementioned coil winding fixture. In the latter half of the rotational transport of the aforementioned strip coil, the aforementioned plurality of straight parts are respectively inserted into the aforementioned plurality of comb-shaped grooves. Furthermore, the aforementioned guiding step includes a shaping step, which involves deforming the aforementioned strip coil into an arc shape along the outer periphery of the coil winding fixture during the first half of the rotary conveying of the aforementioned strip coil, while the aforementioned side end of the aforementioned strip coil is clamped. In the aforementioned guiding step, at least in the aforementioned shaping step, a convex pressing portion protruding circumferentially on the inner circumferential side of the aforementioned guiding member is used to shape the stable stacked portion of the aforementioned strip coil where no local difference in the number of coil layers occurs in the bent portion connecting the aforementioned straight portion to the aforementioned side end, by sliding contact and pressing. in, The aforementioned guide member is configured as an outer peripheral guide member having an inner peripheral surface side curvature along the outer periphery of the aforementioned coil winding fixture, and the aforementioned protruding pressing portion is provided on the inner peripheral surface of the aforementioned outer peripheral guide member.

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