Feeding rolls and wire feeding devices

Abstract

To provide a feeding roll and a wire feeding device that are capable of attaching and detaching rolls using a simpler mechanism while regulating the relative rotation of the rolls.SOLUTION: A feeding roll A10 includes a gear 10, a boss 30, and a roll 20. The boss 30 has a rotation regulating part 39, a base part 31 fixed to the gear 10, and a support piece 32. The support piece 32 extends from the base 31 in an axis central direction N. The roll 20 has an inner peripheral surface 21 surrounding the boss 30 and a groove 24 recessed from the inner peripheral surface 21. At least a portion of the rotation regulating part 39 is accommodated in the groove 24. The support piece 32 has a beam part 321 and a claw part 322. The claw part 322 is located on the opposite side of the gear 10 with respect to the inner peripheral surface 21 in the axis central direction N. The beam part 321 bends in a radial direction r toward the side where an axis center n is located. The claw part 322 protrudes from the beam part 321 in the radial direction r on the side opposite to the side where the axis center n is located with respect to the inner peripheral surface 21.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a feeding roll for feeding a wire used in gas shielded arc welding, and a wire feeding device including the feeding roll.

Background Art

[0002] Patent Document 1 discloses an example of a drive roll carrier that constitutes a feeding roll. The drive roll carrier includes a gear and a hub protruding in the axial direction from the gear. The hub rotates integrally with the gear around the axial direction. The drive roll is attached to the hub. The drive roll carrier further includes a lug extending in the axial direction. The lug protrudes radially from the hub. At least a part of the lug is accommodated in a slot recessed from the inner peripheral surface of the drive roll. By adopting this configuration, relative rotation of the drive roll with respect to the hub is restricted, so that idling of the drive roll can be prevented.

[0003] The drive roll carrier disclosed in Patent Document 1 further includes a retainer. The retainer is a detaching mechanism of the drive roll provided on the hub. Here, the drive roll needs to be regularly replaced due to wear or the like. The main component of the retainer is a ball incorporated in the hub. A part of the ball is exposed to the outside from the hub in the radial direction. The ball is movable in the radial direction by the restoring force of a spring. By adopting this configuration, it is possible to detach the drive roll from the hub without using a tool and to restrict the axial movement of the drive roll attached to the hub. However, since the structure of the retainer disclosed in Patent Document 1 is complicated, a simpler structure is expected for reasons such as ease of maintenance.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

[0005] In view of the above circumstances, the object of the present invention is to provide a feed roll that allows for the attachment and detachment of the roll by a simpler mechanism while restricting the relative rotation of the rolls, and a wire feed device equipped with the feed roll. [Means for solving the problem]

[0006] A feeding roll provided by a first aspect of the present invention comprises: a gear having a plurality of teeth arranged around the axial direction; a boss protruding from the gear in the axial direction and rotatable integrally with the gear around the axial direction; and a roll mounted on the boss, having an inner circumferential surface surrounding the boss around the axial direction, wherein the boss has a rotation restricting portion that restricts the relative rotation of the roll around the axial direction; a base fixed to the gear; and a support piece connected to the base and extending in the axial direction. The roll has a groove that extends in the axial direction and is recessed from the inner circumferential surface, and at least a portion of the rotation restricting portion is housed in the groove, and the support piece has a beam portion facing the inner circumferential surface and a claw portion connected to the beam portion and located on the opposite side from the gear with respect to the inner circumferential surface in the axial direction, the beam portion deflects toward the side where the axis of the boss is located in the radial direction perpendicular to the axial direction, and the claw portion protrudes from the beam portion toward the side opposite to where the axis is located with respect to the inner circumferential surface in the radial direction.

[0007] Preferably in the implementation of the present invention, the rotation restricting portion includes a projection provided on the boss, the projection extending in the axial direction and projecting radially away from the axis than the beam portion.

[0008] Preferably in the implementation of the present invention, the rotation restricting portion includes the support piece.

[0009] Preferably in the embodiment of the present invention, the boss has a recess that extends in the axial direction and is recessed on the side where the axis is located in the radial direction, and at least a portion of the beam portion is housed in the recess.

[0010] A wire feeding device provided by a second aspect of the present invention comprises a support member, a feeding roll provided by a first aspect of the present invention rotatably supported by the support member around an axial direction, and a pressure roll rotatably supported by the support member around the axial direction, wherein the roll of the feeding roll has a first circumferential surface facing away from the inner circumferential surface in a radial direction perpendicular to the axial direction, and the pressure roll has a second circumferential surface facing the first circumferential surface, with a wire sandwiched between the first and second circumferential surfaces, and the first circumferential surface and the wire being pressed against the second circumferential surface. [Effects of the Invention]

[0011] According to the feeding roll and wire feeding device of the present invention, it is possible to attach and detach the rolls with a simpler mechanism while restricting the relative rotation of the rolls.

[0012] Other features and advantages of the present invention will become more apparent from the detailed description below, based on the accompanying drawings. [Brief explanation of the drawing]

[0013] [Figure 1] This is a perspective view of a feeding roll according to a first embodiment of the present invention, showing the roll detached from the boss. [Figure 2] Figure 1 is a front view of the feeding roll. [Figure 3] This is a cross-sectional view along line III-III in Figure 2. [Figure 4] This is a cross-sectional view along the line IV-IV in Figure 2. [Figure 5] This is a cross-sectional view along the VV line in Figure 1. [Figure 6] This is a magnified view of a portion of Figure 3. [Figure 7]Partial enlarged cross-sectional view of the feed roll according to the second embodiment of the present invention. [Figure 8] Cross-sectional view of the feed roll shown in FIG. 7, where the cross-sectional position is along line VIII-VIII in FIG. 7. [Figure 9] Cross-sectional view of the feed roll shown in FIG. 7, where the cross-sectional position is along line IX-IX in FIG. 7. [Figure 10] Front view of the wire feeding device according to an embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0014] Embodiments for carrying out the present invention will be described based on the accompanying drawings.

[0015] 〔First Embodiment〕 Based on FIGS. 1 to 6, the feed roll A10 according to the first embodiment of the present invention will be described. The feed roll A10 includes a gear 10, a roll 20, a boss 30, and two bearings 40. Here, in FIG. 5, for convenience of understanding, the roll 20 is shown by an imaginary line (two-dot chain line).

[0016] The feed roll A10 is rotatably supported on either of two first support shafts 51 of a feeding device B to be described later. In the description of the feed roll A10, the direction in which the two first support shafts 51 extend is called the "axial direction N". Therefore, the feed roll A10 is rotatable around the axial direction N. The axial direction N passes through the axis n of the boss 30. The direction orthogonal to the axial direction N is called the "radial direction r".

[0017] As shown in FIGS. 1 and 2, the gear 10 is a spur gear provided with a plurality of teeth 11 along the axial direction N. The gear 10 is made of metal. As shown in FIGS. 3 and 4, the gear 10 has a support surface 12, two first grooves 13, and two second grooves 14.

[0018] As shown in FIGS. 3 and 4, the support surface 12 faces the radial direction r and surrounds the axis n of the boss 30 (hereinafter simply referred to as "axis n"). The area surrounded by the support surface 12 is a cavity. The two first grooves 13 and the two second grooves 14 both recess from the support surface 12 in the radial direction r and extend in the axial direction N. The two first grooves 13 are located on opposite sides of each other with respect to the axis n in the radial direction r. Each of the two second grooves 14 is located between the two first grooves 13 around the axial direction N. Around the axial direction N, each of the two second grooves 14 is located at approximately 90° with respect to either of the two first grooves 13. Therefore, the two second grooves 14 are located on opposite sides of each other with respect to the axis n in the radial direction r.

[0019] In the feed roll A10, the gear 10 forms an annular shape defined by the support surface 12, the two first grooves 13, and the two second grooves 14. In addition, the gear 10 may be a disk shape that does not have the support surface 12, the two first grooves 13, and the two second grooves 14.

[0020] As shown in FIGS. 2 to 4, the roll 20 is mounted on the boss 30. The roll 20 is annular. As shown in FIGS. 2 to 4, the roll 20 has an inner peripheral surface 21, a first end surface 22, a first peripheral surface 23, and two grooves 24.

[0021] As shown in FIGS. 2 to 4, the inner peripheral surface 21 faces the radial direction r and surrounds the boss 30 around the axial direction N. The area surrounded by the inner peripheral surface 21 is a cavity. The boss 30 is inserted into the cavity in the axial direction N. As shown in FIG. 6, the first end surface 22 is connected to the inner peripheral surface 21 and surrounds the axis n. The first end surface 22 is located on the opposite side of the gear 10 with respect to the inner peripheral surface 21 in the axial direction N. The first end surface 22 is inclined with respect to the inner peripheral surface 21. The direction of inclination of the first end surface 22 is such that it moves away from the inner peripheral surface 21 in the axial direction N and away from the axis n in the radial direction r.

[0022] As shown in Figures 2 to 4, the first circumferential surface 23 faces away from the inner circumferential surface 21 in the radial direction r and extends around the axial direction N. The first circumferential surface 23 is provided with a circumferential groove 231 that is recessed in the radial direction r and extends around the axial direction N. In the feeding device B described later, the wire W is held in the circumferential groove 231.

[0023] As shown in Figures 2 and 4, the two grooves 24 extend in the axial direction N and are recessed from the inner circumferential surface 21. The two grooves 24 are located on opposite sides of each other in the radial direction r with respect to the axis n. Each of the two grooves 24 is located between the two support pieces 32 of the boss 30, which will be described later, around the axial direction N. Around the axial direction N, each of the two grooves 24 is located at approximately 90° with respect to either of the two support pieces 32. In the feed roll A10, both sides of each of the two grooves 24 in the axial direction N are open.

[0024] As shown in Figures 1, 3, and 4, the boss 30 protrudes from the gear 10 in the axial direction N. The boss 30 is rotatable around the axial direction N together with the gear 10. The boss 30 is made of resin. As shown in Figures 3 and 4, the boss 30 has a base 31, two support pieces 32, two recesses 33, two protrusions 34, an axial hole 35, and two support parts 36.

[0025] As shown in Figures 3 and 4, the base 31 is supported on the support surface 12 of the gear 10 around the axial direction N. The base 31 is in firm contact with the support surface 12. This fixes the base 31 to the gear 10.

[0026] As shown in Figures 3 and 4, the two support pieces 32 are connected to the base 31 and extend in the axial direction N. The two support pieces 32 are located on opposite sides of each other in the radial direction r with respect to the axis n. The two support pieces 32 and the two first grooves 13 of the gear 10 are all located in the same cross-section. The in-plane directions of this cross-section are the axial direction N and the radial direction r.

[0027] As shown in Figure 6, each of the two support pieces 32 has a beam portion 321 and a claw portion 322. The beam portion 321 faces the inner circumferential surface 21 of the roll 20. At least a portion of the beam portion 321 is housed in the region enclosed by the inner circumferential surface 21. The beam portion 321 is connected to the base portion 31. The beam portion 321 is in contact with the inner circumferential surface 21. The claw portion 322 is connected to the beam portion 321 and is located on the opposite side from the gear 10 with respect to the inner circumferential surface 21 in the axial direction N. The claw portion 322 protrudes from the beam portion 321 on the opposite side from the side where the axis n is located with respect to the inner circumferential surface 21 in the radial direction r. The claw portion 322 has an opposing surface 322A. The opposing surface 322A faces the first end surface 22 of the roll 20. The opposing surface 322A is inclined in the same direction as the first end surface 22 with respect to the axial direction N.

[0028] As shown in Figure 6, the beam portion 321 forms a cantilever beam with its boundary with the base portion 31 as a fixed end. When an external force in the radial direction r is applied to the beam portion 321, the beam portion 321 undergoes elastic deformation. This allows the beam portion 321 to deflect in the radial direction r toward the axis n. The beam portion 321 deflects radially r to such an extent that the entire claw portion 322 can move toward the axis n toward the axis n toward the inner circumferential surface 21 of the roll 20 in the radial direction r. In Figure 6, the deflected state of the beam portion 321 is shown by dashed lines.

[0029] As shown in Figures 2 and 5, the two recesses 33 extend in the axial direction N and are recessed on the side where the axis n is located in the radial direction r. The two recesses 33 are located on opposite sides of each other with respect to the axis n in the radial direction r. At least a portion of each beam portion 321 of the two support pieces 32 is individually housed in the two recesses 33.

[0030] As shown in Figures 2, 4, and 5, a portion of each of the two protrusions 34 is individually housed in two grooves 24 of the roll 20. In the feed roll A10, the two protrusions 34 are included in the rotation restricting section 39, which restricts the relative rotation of the roll 20 around the axial direction N with respect to the boss 30. The two protrusions 34 extend in the axial direction N and project from the base 31 on the side away from the axis n in the radial direction r. As shown in Figure 5, the two protrusions 34 project further away from the axis n in the radial direction r than the beam portion 321 of each of the two support pieces 32. Furthermore, a portion of each of the two protrusions 34 is individually housed in two second grooves 14 of the gear 10.

[0031] As shown in Figures 3 and 4, the shaft hole 35 penetrates the boss 30 in the axial direction N. One of the two first support shafts 51 of the feeding device B, which will be described later, is inserted through the shaft hole 35. As shown in Figure 4, the two support parts 36 are recessed in the axial direction N from both sides of the boss 30 in the axial direction N. The two support parts 36 are connected to the shaft hole 35.

[0032] As shown in Figure 4, the two bearings 40 are fitted into the two support portions 36 of the boss 30. Along with the shaft holes 35 of the boss 30, one of the two first support shafts 51 of the feeder B, which will be described later, is inserted through the two bearings 40. In the feeder B, which will be described later, the two bearings 40 are supported by one of the two first support shafts 51 so that they can rotate around the axial direction N.

[0033] Next, we will explain the function and effects of the feed roll A10.

[0034] The feed roll A10 comprises a boss 30 that protrudes from the gear 10 in the axial direction N and is rotatable around the axial direction N together with the gear 10, and a roll 20 having an inner circumferential surface 21 that surrounds the boss 30 around the axial direction N. The boss 30 has a rotation restricting portion 39 that restricts the relative rotation of the roll 20 around the axial direction N. The roll 20 has a groove 24 that extends in the axial direction N and is recessed from the inner circumferential surface 21. At least a part of the rotation restricting portion 39 is housed in the groove 24. With this configuration, when the boss 30 rotates, the rotation restricting portion 39 contacts the groove 24 around the axial direction N. As a result, the relative rotation of the roll 20 around the axial direction N (rotation relative to the boss 30) is restricted, and thus the roll 20 can be prevented from slipping.

[0035] The boss 30 has a base 31 fixed to the gear 10 and a support piece 32 connected to the base 31 and extending in the axial direction N. The support piece 32 has a beam portion 321 and a claw portion 322. The beam portion 321 bends toward the side where the axis n is located in the radial direction r. With this configuration, when the roll 20 is pulled away from the boss 30, the first end face 22 of the roll 20 comes into contact with the opposing surface 322A of the claw portion 322, and an external force acts on the claw portion 322 toward the side where the axis n is located in the radial direction r. As a result, the beam portion 321 bends toward the side where the axis n is located in the radial direction r, and the entire support piece 32 moves toward the side where the axis n is located relative to the inner circumferential surface 21 in the radial direction r. In this case, although a restoring force acts on the beam portion 321, the claw portion 322 contacts the inner circumferential surface 21 of the roll 20, thus restricting the movement of the support piece 32 in the radial direction r. Therefore, the roll 20 can be smoothly removed from the boss 30. Conversely, when attempting to insert the roll 20 into the boss 30, the roll 20 contacts the claw portion 322, and an external force acts on the claw portion 322 toward the side where the axis n is located in the radial direction r. Therefore, the roll 20 can be smoothly attached to the boss 30 by the same mechanism as when removing the roll 20 from the boss 30. Thus, the boss 30 can be attached to and detached from the boss 30 without the need for tools.

[0036] The claw portion 322 of the boss 30 protrudes from the beam portion 321 of the boss 30 on the side opposite to the side where the axis n is located, with reference to the inner circumferential surface 21 of the roll 20 in the radial direction r. With this configuration, when the roll 20 mounted on the boss 30 attempts to move in the axial direction N, the movement of the roll 20 is restricted by the claw portion 322. In the feed roll A10, the movement of the roll 20 is restricted when the first end face 22 of the roll 20 contacts the opposing surface 322A of the claw portion 322. This prevents the roll 20 from falling off the boss 30 when the feed roll A10 rotates around the axial direction N. Thus, the feed roll A10 makes it possible to attach and detach the roll 20 with a simpler mechanism while restricting the relative rotation of the roll 20.

[0037] In the feed roll A10, the rotation restricting section 39 includes a ridge 34 provided on the boss 30. The ridge 34 extends in the axial direction N and protrudes radially r away from the axis n than the beam portion 321 of the support piece 32. This configuration increases the cross-sectional area of ​​the rotation restricting section 39 with respect to the axial direction N. As a result, the bending rigidity of the rotation restricting section 39 increases, making it possible to obtain a rotation restricting section 39 that is less susceptible to bending deformation. Furthermore, the contact area of ​​the rotation restricting section 39 with respect to the groove 24 around the axial direction N increases. As a result, the torque around the axial direction N transmitted from the boss 30 to the roll 20 increases. Therefore, the reduction in the axial force on the wire W (see Figure 10) acting from the feed roll A10 can be suppressed.

[0038] The boss 30 has a recess 33 that extends in the axial direction N and is recessed on the side where the axis n is located in the radial direction r. At least a portion of the beam portion 321 of the support piece 32 is housed in the recess 33. With this configuration, when the beam portion 321 bends on the side where the axis n is located in the radial direction r, it is possible to avoid the beam portion 321 coming into contact with the base portion 31 of the boss 30 or the like. As a result, the entire support piece 32 can be reliably moved on the side where the axis n is located with respect to the inner circumferential surface 21 in the radial direction r.

[0039] [Second Embodiment] A feed roll A20 according to a second embodiment of the present invention will be described based on Figures 7 to 9. In these figures, elements that are the same as or similar to those of the feed roll A10 described above are denoted by the same reference numerals, and redundant explanations are omitted. Here, the cross-sectional position in Figure 7 is the same as the cross-sectional position in Figure 6 showing the feed roll A10. In Figures 8 and 9, the roll 20 is shown with dashed lines for ease of understanding.

[0040] In the feed roll A20, the configuration of the roll 20 and the boss 30 differs from that of the feed roll A10. Furthermore, in the feed roll A20, the boss 30 does not have two protrusions 34.

[0041] As shown in Figures 8 and 9, the roll 20 has four grooves 24. The four grooves 24 are located at approximately 90° intervals around the axial direction N.

[0042] As shown in Figures 7 and 8, the base 31 of the boss 30 includes four protrusions 311. Viewed in the axial direction N, the four protrusions 311 project toward the side opposite to the side where the axis n is located in the radial direction r with respect to the inner circumferential surface 21 of the roll 20. The four protrusions 311 are individually housed in the four grooves 24 of the roll 20. Each of the four protrusions 311 has two first sides 311A ​​facing opposite each other in the circumferential direction of the axis n.

[0043] As shown in Figures 7 and 9, the boss 30 has four support pieces 32. The beam portions 321 of the four support pieces 32 are individually connected to four protrusions 311 of the base 31. Furthermore, the four beam portions 321 are individually housed in four grooves 24 of the roll 20. Each of the four beam portions 321 has two second sides 321A that face opposite each other in the circumferential direction of the axis n.

[0044] As shown in Figure 7, the roll 20 has a second end face 25 that is individually connected to the four grooves 24. The second end face 25 is located on the opposite side of the gear 10 with respect to the four grooves 24 in the axial direction N. The second end face 25 faces the opposing surfaces 322A of the claw portions 322 of the four support pieces 32. The second end face 25 is inclined in the same direction as the first end face 22 of the roll 20 with respect to the axial direction N.

[0045] In the feed roll A20, the four protrusions 311 of the base 31 and the beam portions 321 of the four support pieces 32 are included in the rotation restricting portion 39. Here, when the roll 20 attempts to rotate relative to the boss 30 around the axial direction N, the two first sides 311A ​​of the protrusions 311 contact the surface defining one of the four grooves 24 of the roll 20. At the same time, the two second sides 321A of the beam portions 321 contact the surface defining one of the four grooves 24. As a result, the relative rotation of the roll 20 around the axial direction N with respect to the boss 30 is restricted, and the four protrusions 311 and the four beam portions 321 function as the rotation restricting portion 39. Therefore, in the feed roll A20, the rotation restricting portion 39 includes the four support pieces 32.

[0046] Next, we will explain the effects and benefits of the feed roll A20.

[0047] The feed roll A20 comprises a boss 30 that protrudes from the gear 10 in the axial direction N and is rotatable around the axial direction N together with the gear 10, and a roll 20 having an inner circumferential surface 21 that surrounds the boss 30 around the axial direction N. The boss 30 has a rotation restricting portion 39 that restricts the relative rotation of the roll 20 around the axial direction N. The roll 20 has a groove 24 that extends in the axial direction N and is recessed from the inner circumferential surface 21. At least a part of the rotation restricting portion 39 is housed in the groove 24. Therefore, the feed roll A20 also restricts the relative rotation of the roll 20 around the axial direction N.

[0048] The boss 30 has a base 31 fixed to the gear 10 and a support piece 32 connected to the base 31 and extending in the axial direction N. The support piece 32 has a beam portion 321 and a claw portion 322. The beam portion 321 deflects in the radial direction r toward the side where the axis n is located. The claw portion 322 protrudes from the beam portion 321 of the boss 30 toward the side opposite to where the axis n is located, with reference to the inner circumferential surface 21 of the roll 20 in the radial direction r. Therefore, even with the feed roll A20, it is possible to attach and detach the roll 20 with a simpler mechanism while restricting the relative rotation of the roll 20.

[0049] In the feed roll A20, the rotation restricting section 39 includes a support piece 32. Therefore, the support piece 32 not only supports the roll 20 but also functions as the rotation restricting section 39. With this configuration, the number of grooves 24 in the roll 20 matches the number of support pieces 32. As the number of support pieces 32 increases, the torque transmitted from the boss 30 to the roll 20 around the axial direction N is more evenly distributed around the axial direction N of the roll 20. Consequently, the time-dependent fluctuation of the axial force on the wire W (see Figure 10) acting from the feed roll A20 can be reduced.

[0050] In the feed roll A20, if the roll 20 mounted on the boss 30 attempts to move in the axial direction N, the movement of the roll 20 is restricted by the claw portion 322. In the feed roll A20, the movement of the roll 20 is restricted when the second end face 25 of the roll 20 contacts the opposing surface 322A of the claw portion 322 of the support piece 32.

[0051] [Wire feeding device] Next, the wire feeding device of the present invention (hereinafter simply referred to as "feeding device B") will be described based on Figure 10. In this figure, elements that are the same as or similar to the feeding roll A10 described above are denoted by the same reference numerals, and redundant explanations are omitted. Feeding device B feeds the wire W used for gas shielded arc welding to the torch.

[0052] In the description of the wire feeder B, for convenience, the axial direction of the wire W fed to the torch by the wire feeder B is referred to as the "horizontal direction H". The direction perpendicular to the axial direction N and the horizontal direction H is referred to as the "vertical direction V".

[0053] The feeding device B comprises a support member 50, a feeding roll A, an additional feeding roll A', a pressure roll 61, and an additional pressure roll 62. The configuration of feeding roll A is the same as that of either feeding roll A10 or feeding roll A20 described above. The configuration of the additional feeding roll A' is the same as that of feeding roll A. The configuration of the additional pressure roll 62 is the same as that of pressure roll 61.

[0054] The support member 50 supports each of the feed roll A, the additional feed roll A', the pressure roll 61, and the additional pressure roll 62 so that they can rotate around the axial direction N, and also rotates the feed roll A and the additional feed roll A'. As shown in Figure 10, the support member 50 has two first support shafts 51, two second support shafts 52, two third support shafts 53, a first arm 54, a second arm 55, a drive gear 56, and a guide section 57.

[0055] As shown in Figure 10, the two first support shafts 51 are located apart from each other in the horizontal direction H. The feed roll A and the additional feed roll A' are individually rotatably supported on the two first support shafts 51. The two second support shafts 52 are located apart from each other in the horizontal direction H and apart from the two first support shafts 51 in the vertical direction V. The pressure roll 61 is rotatably supported on the second support shaft 52 of the two second support shafts 52 that is closest to the feed roll A. The additional pressure roll 62 is rotatably supported on the second support shaft 52 of the two second support shafts 52 that is closest to the additional feed roll A'.

[0056] As shown in Figure 10, the two third support axes 53 are located apart from each other in the horizontal direction H, and in the vertical direction V, they are located on the opposite side of the two first support axes 51 with respect to the two second support axes 52.

[0057] As shown in Figure 10, the first arm 54 is rotatably supported around the axial direction N by the third support shaft 53, which is the closest of the two third support shafts 53 to the pressure roll 61. Of the two second support shafts 52, the second support shaft 52 that supports the pressure roll 61 is supported by the first arm 54. As a result, when the first arm 54 is rotated around the axial direction N, the pressure roll 61 moves in the vertical direction V.

[0058] As shown in Figure 10, the second arm 55 is rotatably supported around the axial direction N on the third support shaft 53, which is the closest of the two third support shafts 53 to the additional pressure roll 62. Of the two second support shafts 52, the second support shaft 52 supporting the additional pressure roll 62 is supported on the second arm 55. As a result, when the second arm 55 is rotated around the axial direction N, the additional pressure roll 62 moves in the vertical direction V.

[0059] As shown in Figure 10, the drive gear 56 meshes with the gear 10 of feed roll A and the gear 10 of the additional feed roll A'. The drive gear 56 is driven around the axial direction N by a drive source such as a motor. As a result, feed roll A and the additional feed roll A' rotate in the same direction.

[0060] As shown in Figure 10, the guide portion 57 extends in the horizontal direction H and is located between the two first support shafts 51 and the two second support shafts 52 in the vertical direction V. The guide portion 57 is provided with an insertion hole 571 that penetrates the guide portion 57 in the horizontal direction H. The wire W is inserted through the insertion hole 571.

[0061] As shown in Figure 10, the pressure roll 61 has a second circumferential surface 611 that faces the first circumferential surface 23 of the feed roll A's roll 20. The wire W is sandwiched between the first circumferential surface 23 and the second circumferential surface 611. When the first arm 54 rotates axially in the direction N toward the feed roll A, the pressure roll 61 comes into contact with the feed roll A, and the first circumferential surface 23 and the wire W are pressed against the second circumferential surface 611. At the same time, when the second arm 55 rotates axially in the direction N toward the additional feed roll A', the additional pressure roll 62 comes into contact with the additional feed roll A', and the first circumferential surface 23 and the wire W of the additional feed roll A' are pressed against the second circumferential surface 611 of the additional pressure roll 62.

[0062] As the feed roll A and the additional feed roll A' rotate while maintaining the above state, the pressure roll 61 and the additional pressure roll 62 rotate in the same direction as feed roll A. Furthermore, a horizontal force H acts on the wire W from feed roll A, the additional feed roll A', the pressure roll 61, and the additional pressure roll 62. This makes it possible for the wire W to move in the horizontal direction H.

[0063] The present invention is not limited to the embodiments described above. The specific configuration of each part of the present invention can be modified in various ways. [Explanation of symbols]

[0064] A10, A20: Feeding roll, B: Feeding device, 10: Gear, 11: Tooth, 12: Support surface, 13: First groove, 14: Second groove, 20: Roll, 21: Inner circumferential surface, 22: First end surface, 23: First circumferential surface, 231: Circumferential groove, 24: Groove, 25: Second end surface, 30: Boss, 31: Base, 311: Protrusion, 311A: First side surface, 32: Support piece, 321: Beam, 321A: Second side surface, 322: Claw, 322A: Opposing surface 33: recess, 34: projection, 35: shaft hole, 36: support part, 39: rotation restricting part, 40: bearing, 50: support member, 51: first support shaft, 52: second support shaft, 53: third support shaft, 54: first arm, 55: second arm, 56: drive gear, 57: guide part, 571: insertion hole, 61: pressure roll, 611: second circumferential surface, 62: additional pressure roll, A: feed roll, A': additional feed roll, n: axis, W: wire

Claims

1. A gear with multiple teeth arranged around the axial direction, A boss protruding from the gear in the axial direction and rotatable integrally with the gear around the axial direction, The system comprises a roll mounted on the boss, which has an inner circumferential surface surrounding the boss around the axial direction, The boss has a rotation restricting portion that restricts the relative rotation of the roll around the axial direction, a base fixed to the gear, and a support piece connected to the base and extending in the axial direction. The roll has a groove that extends in the axial direction and is recessed from the inner circumferential surface, At least a portion of the rotation restricting portion is housed in the groove, The support piece has a beam portion facing the inner circumferential surface and a claw portion connected to the beam portion and located on the opposite side from the gear with respect to the inner circumferential surface in the axial direction. The beam portion deflects toward the side where the axis of the boss is located in the radial direction perpendicular to the axial direction, The claw portion protrudes from the beam portion on the side opposite to the side where the axis is located with respect to the inner circumferential surface in the radial direction. The boss has a recess that extends in the axial direction and is recessed on the side where the axis is located in the radial direction. At least a portion of the beam is housed in the recess, The roll has a facing surface that faces the gear in the axial direction, In the axial direction, the recess reaches the position of the opposing surface, in a feed roll.

2. The rotation restricting portion includes a projection provided on the boss, The feeding roll according to claim 1, wherein the ridge extends in the axial direction and protrudes radially away from the axis than the beam portion.

3. The feeding roll according to claim 1, wherein the rotation restricting portion includes the support piece.

4. A support member and A feeding roll according to any one of claims 1 to 3, which is supported by the support member so as to be rotatable around the axial direction, The support member comprises a pressure roll rotatably supported on the support member around the axial direction, The feed roll has a first circumferential surface that faces away from the inner circumferential surface in the radial direction perpendicular to the axial direction, The pressure roll has a second circumferential surface opposite to the first circumferential surface, A wire is sandwiched between the first and second circumferential surfaces. A wire feeding device in which the first circumferential surface and the wire are pressed against the second circumferential surface.

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