Wire Feeder

Abstract

To provide a wire feeder that is superior in assemblability and maintainability.SOLUTION: A wire feeder comprises: a metal structure 2 for causing welding power supply to flow; and a wire feeding mechanism 3 for feeding a welding wire. The metal structure 2 includes a first wall 21, a second wall 22, and a third wall 23. The wire feeding mechanism 3 includes a driving part 31 and a motor 32. The first wall 21 and the second wall 22 are disposed separated at a feeding direction front part X1 and a feeding direction rear part X2 of the welding wire, and they are mutually overlapped when viewed in a feeding direction X. The third wall 23 leads to a position deflected to a first direction one side Y1, relative to each of the first wall 21 and the second wall 22. In a space area S1 which is surrounded by the first wall 21, the second wall 22, and the third wall 23 when viewed in a second direction Z, and is overlapped with the third wall 23 when viewed in the first direction Y, at least a part of the motor 32 is disposed.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to a wire feeding device.

Background Art

[0002] In consumable electrode gas shielded arc welding, automatic welding using a welding robot or a traveling carriage, and semi-automatic welding operated by an operator are adopted. During welding operations such as these automatic weldings, a welding wire is fed toward a welding torch by a wire feeding device, and power and shielding gas are supplied to the welding torch. Welding power is supplied to the welding torch from, for example, a welding power source via a power cable or a control cable. Inside the wire feeding device, a power supply cable or a power supply conductor is arranged as a path for flowing a welding current, and the welding power is supplied to the welding torch via the power supply conductor or the like (see, for example, Patent Document 1). In the welding device described in Patent Document 1, the welding torch is a so-called water-cooled torch, and cooling water (coolant) is supplied to the welding torch. As shown in FIGS. 5 to 7 of Patent Document 1 and the like, a gas pipe and a water-cooled hose are also arranged inside the wire feeding device.

[0003] As described in this Patent Document 1 (see FIGS. 5 and 6 of the same document), inside the wire feeding device (4), a power supply conductor (48) for flowing a welding current, a gas pipe (65) for sending a shielding gas, and two water-cooled hoses (66) for flowing cooling water are separately arranged. In such a configuration, the structure for arranging each of the power supply conductor, the gas pipe, and the water-cooled hose inside the wire feeding device becomes complicated, which causes the wire feeding device to be enlarged. In addition, the assemblability and maintainability are poor, and there is room for improvement.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention has been conceived under such circumstances, and the main problem thereof is to provide a wire feeding device excellent in assemblability and maintainability.

Means for Solving the Problems

[0006] In order to solve the above problems, the present invention employs the following technical means.

[0007] The wire feeding device provided by the present invention includes a metal structure for passing a welding power source and a wire feeding mechanism for feeding a welding wire. The metal structure includes a first wall portion, a second wall portion, and a third wall portion. The wire feeding mechanism includes a driving portion and a motor for driving the driving portion. The first wall portion and the second wall portion are spaced apart on one side and the other side in the feeding direction of the welding wire, and overlap each other when viewed in the feeding direction. The third wall portion is connected to each of the first wall portion and the second wall portion at a position biased to one side in a first direction orthogonal to the feeding direction. At least a part of the motor is disposed in a space region surrounded by the first wall portion, the second wall portion, and the third wall portion when viewed in a second direction orthogonal to both the feeding direction and the first direction, and overlapping the third wall portion when viewed in the first direction.

[0008] In a preferred embodiment, the motor is fixed to the third wall portion.

[0009] In a preferred embodiment, the metal structure has an opening that opens to the other side in the first direction with respect to the third wall portion.

[0010] In a preferred embodiment, the first wall portion and the second wall portion are each provided with a first wire insertion hole and a second wire insertion hole that penetrate along the feeding direction and through which the welding wire passes.

[0011] In a preferred embodiment, the metal structure is formed across the first wall portion, the second wall portion, and the third wall portion, and includes a hollow fluid passage for flowing a fluid.

[0012] In a preferred embodiment, the constituent material of the welding relay includes aluminum.

Advantages of the Invention

[0013] In the wire feeding device according to the present invention, the metal structure for passing a welding current has a first wall portion, a second wall portion, and a third wall portion, and forms an inner space region surrounded by these first wall portion, second wall portion, and third wall portion. The above space region serves as an accommodation space for the motor. The first wall portion, the second wall portion, and the third wall portion are arranged at positions corresponding to three sides of a rectangle when viewed in the second direction. Further, the first wall portion, the second wall portion, and the third wall portion are arranged asymmetrically in the first direction with respect to the center line along the feeding direction of the welding wire when viewed in the second direction. For this reason, the motor can be efficiently arranged in the above space region formed by the metal structure with space saving. Thereby, the strength of the metal structure including the first wall portion, the second wall portion, and the third wall portion is improved. In addition, in the wire feeding device, the assembly and replacement of the metal structure and the wire feeding mechanism are easy, and the assemblability and maintainability are excellent.

[0014] Other features and advantages of the present invention will become clearer from the following detailed description with reference to the accompanying drawings.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

[0016] Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

[0017] In the present invention, terms such as "first", "second", "third", etc. are merely used as labels and are not necessarily intended to assign an order to those objects. Also, "a certain object A overlaps when viewed in a certain direction with respect to a certain object B" includes, unless otherwise specified, "a certain object A overlapping all of a certain object B" and "a certain object A overlapping a part of a certain object B".

[0018] FIG. 1 is a perspective view showing an example of a wire feeding device according to the present invention. Although detailed illustration description is omitted, the wire feeding device A1 feeds a welding wire to a welding torch (not shown), and is a so-called pull-side feeding device. The welding wire is guided to the tip of the welding torch through the inside of a torch cable connected to the wire feeding device A1 and a liner provided inside the welding torch (both not shown). In FIG. 1, the left side is the front in the feeding direction X of the welding wire (hereinafter, appropriately referred to as "front X1 in the feeding direction"), and the right side is the rear in the feeding direction X of the welding wire (hereinafter, appropriately referred to as "rear X2 in the feeding direction"). To the rear X2 in the feeding direction of the wire feeding device A1, for example, an intermediate cable, a wire feeding device (push-side feeding device), and a welding power source device (all not shown) are connected. The wire feeding device A1 of the present embodiment is used for so-called semi-automatic welding in which, for example, an operator operates the welding torch. In the description of the wire feeding device A1 shown in FIGS. 1 to 4, the vertical direction is defined based on the normal use posture. The above feeding direction X is a direction substantially along the horizontal plane.

[0019] The wire feeding device A1 shown in FIGS. 1 to 5 includes a case 1, a metal structure 2, a wire feeding mechanism 3, a handle 4, and a cover 6. The case 1 is formed in a cylindrical shape extending in the feeding direction X as a whole, and houses the metal structure 2 and the wire feeding mechanism 3. The case 1 is composed of a pair of separable split pieces (lower case 1A and upper case 1B). As shown in FIG. 3, the lower case 1A and the upper case 1B constituting the case 1 can be split in the vertical direction (second direction Z) perpendicular to the feeding direction X. These lower case 1A and upper case 1B are connected by appropriate means such as screwing in a combined state. As shown in FIG. 5, the case 1 has a substantially rectangular cross section in the main part. The case 1 (lower case 1A and upper case 1B) is made of a material having electrical insulation properties. Examples of the material constituting the case 1 include synthetic resin materials such as polyamide resin (with glass fiber). However, the material constituting the case 1 (lower case 1A and upper case 1B) is not limited to synthetic resin.

[0020] Case 1 has a bottom wall 11, a first side wall 12, a second side wall 13, and a ceiling wall 14, each generally extending in the feeding direction X. The bottom wall 11 is the lowest - positioned part in Case 1. In the present embodiment, the part of the bottom wall 11 closer to the rear X2 in the feeding direction is inclined so as to be displaced upward as it goes toward the rear X2 in the feeding direction. The first side wall 12 stands up from one side (hereinafter, appropriately referred to as "the first - direction one - side Y1") of the first direction Y (a horizontal direction perpendicular to the feeding direction X) perpendicular to the feeding direction X and extends upward. The second side wall 13 stands up from the other side (hereinafter, appropriately referred to as "the first - direction other - side Y2") of the first direction Y and extends upward. The ceiling wall 14 is a part covering the upper ends of the first side wall 12 and the second side wall 13. The lower case 1A includes the bottom wall 11 and parts of the first side wall 12 and the second side wall 13. The upper case 1B includes the ceiling wall 14 and parts of the first side wall 12 and the second side wall 13.

[0021] In the present embodiment, an opening - and - closing door 15 is provided on the case 1 (upper case 1B). The opening - and - closing door 15 is provided straddling the first side wall 12, the ceiling wall 14, and the second side wall 13, and is opened, for example, when maintaining the wire - feeding mechanism 3 arranged inside the case 1. Also, as shown in FIGS. 1, 3, etc., an operation unit 141 is provided at the top of the case 1 (upper case 1B) closer to the rear X2 in the feeding direction. The operation unit 141 is for setting welding conditions such as welding current, welding voltage, and the feeding speed of the welding wire. The operation unit 141 is composed of, for example, a plurality of operation buttons. Based on the operation of the operation unit 141, various welding conditions are controlled. A display unit 142 is provided near the operation unit 141. The display unit 142 displays welding conditions and the like, and is composed of, for example, a display such as an organic EL or a liquid crystal.

[0022] The metal structure 2 is composed of a metal conductor and is a member for passing a welding current. As shown in FIGS. 6 to 9, the metal structure 2 is a block-shaped member. In the present embodiment, the metal structure 2 includes, for example, a first wall portion 21, a second wall portion 22, a third wall portion 23, an opening 24, a first extension portion 25, and a second extension portion 26. The first wall portion 21 and the second wall portion 22 are spaced apart in the forward X1 and rearward X2 directions of the feeding direction. The first wall portion 21 and the second wall portion 22 overlap each other when viewed in the feeding direction X. The third wall portion 23 is connected to both the first wall portion 21 and the second wall portion 22 and extends in the feeding direction X. The third wall portion 23 is connected to each of the first wall portion 21 and the second wall portion 22 at a position biased toward one side Y1 in the first direction. As shown in FIG. 5, the third wall portion 23 has a rectangular cross section. The third wall portion 23 has a recess 231 and a through hole 232. The recess 231 is a portion recessed downward in the second direction Z (vertical direction) with respect to the first wall portion 21 and the second wall portion 22. The through hole 232 is formed in the upper part of the third wall portion 23 and penetrates in the first direction Y. The through hole 232 is used to fix a motor 32, which will be described later, to the third wall portion 23. The opening 24 is a portion that opens to the other side Y2 in the first direction with respect to the third wall portion 23 and overlaps the third wall portion 23 when viewed in the first direction Y. The first extension portion 25 is connected to the upper part of the second wall portion 22 and extends in the rearward X2 direction of the feeding direction. The second extension portion 26 is connected to the lower part of the first wall portion 21 and extends in the feeding direction X.

[0023] As shown in FIG. 9, in the present embodiment, the metal structure 2 includes a gas passage 27 and a coolant passage 28. The gas passage 27 is a hollow passage for flowing gas, and in this embodiment, it is a passage for flowing shielding gas. The gas passage 27 is formed across the first wall portion 21, the second wall portion 22, the third wall portion 23, and the first extension portion 25. The gas passage 27 has a first opening 27a and a second opening 27b. The first opening 27a is provided at one end of the gas passage 27 and is located at the forward X1 (one side of the feeding direction) end in the feeding direction. The second opening 27b is provided at the other end of the gas passage 27 and is located at the rearward X2 (the other side of the feeding direction) end in the feeding direction.

[0024] The coolant passage 28 is a hollow passage for flowing coolant, and in this embodiment, it is a passage for flowing water (cooling water) as the coolant. The coolant passage 28 is formed across the first wall portion 21, the second wall portion 22, the third wall portion 23, the first extension portion 25, and the second extension portion 26. Further, two coolant passages 28 are formed in the metal structure 2. One coolant passage 28 is a water supply passage for sending cooling water to the welding torch, and the other one is a water return passage for passing the water returning from the welding torch.

[0025] The coolant passage 28 has a third opening 28a and a fourth opening 28b. The third opening 28a is provided at one end of the coolant passage 28 and is located at the front end X1 in the feeding direction (one side of the feeding direction). The fourth opening 28b is provided at the other end of the coolant passage 28 and is located at the rear end X2 in the feeding direction (the other side of the feeding direction). The gas passage 27 and the coolant passage 28 are each formed by connecting circular cross-section holes formed at appropriate positions of the metal structure 2. The gas passage 27 and the coolant passage 28 correspond to an example of a "fluid passage".

[0026] In this embodiment, as shown in FIG. 4 and the like, the metal structure 2 (the first wall portion 21, the second wall portion 22, and the first extension portion 25) is provided with a first wire insertion port 211 and a second wire insertion port 221. The first wire insertion port 211 is a through hole formed along the feeding direction X in the first wall portion 21 for passing the welding wire W, and the welding wire W can pass through the first wire insertion port 211. In the example shown in FIG. 4, a liner 81 is arranged in the first wire insertion port 211, and the welding wire W is inserted into the inside of this liner 81. The second wire insertion port 221 is a through hole formed along the feeding direction X in the second wall portion 22 and the first extension portion 25 for passing the welding wire W, and the welding wire W can pass through the second wire insertion port 221. In the example shown in FIG. 4, a liner 82 is arranged in the second wire insertion port 221, and the welding wire W is inserted into the inside of this liner 82.

[0027] The constituent material of the metal structure 2 includes, for example, aluminum. The metal structure 2 is composed of, for example, aluminum or an aluminum alloy. The metal structure 2 is formed, for example, by casting. However, the constituent material of the metal structure 2 is not particularly limited, and it may be, for example, copper, a copper alloy, or other metal conductors.

[0028] As shown in FIGS. 3 and 4, connectors 51 and 52 and a joint portion 53 are provided on the metal structure 2. The connector 51 is provided on the first wall portion 21. The connector 51 communicates with the first opening 27a (gas passage 27). For example, a torch cable (not shown) is connected to this connector 51. The connector 52 is provided on the first extension portion 25. The connector 52 communicates with the second opening 27b (gas passage 27) and the fourth opening 28b (coolant passage 28). For example, an intermediate cable (not shown) is connected to this connector 52. The joint portion 53 is provided near the lower part of the first wall portion 21. The joint portion 53 communicates with the third opening 28a (coolant passage 28). For example, a water-cooling hose (not shown) is connected to the joint portion 53.

[0029] The wire feeding mechanism 3 shown in FIGS. 3 to 5 and the like includes a driving portion 31 and a motor 32 for driving the driving portion 31. Although a detailed illustration description is omitted, the driving portion 31 has a feeding roller and a pressing roller for feeding out while sandwiching the welding wire. Most of the motor 32 is covered by a motor cover 33. The motor cover 33 is composed of a pair of dividable divided pieces. The motor cover 33 is made of a material having electrical insulation properties, and is made of, for example, a synthetic resin material. However, the material constituting the motor cover 33 is not limited to synthetic resin.

[0030] As can be understood from FIGS. 4, 7, 8, etc., at least a part of the motor 32 is disposed in a space region S1 that is surrounded by the first wall portion 21, the second wall portion 22, and the third wall portion 23 when viewed in the second direction Z (vertical direction), and that overlaps the third wall portion 23 when viewed in the first direction Y. That is, at least a part of the motor 32 is disposed in the inner space region S1 surrounded by the first wall portion 21, the second wall portion 22, and the third wall portion 23. In FIG. 7, for convenience of understanding, the wire feeding mechanism 3 is represented by a two-dot chain line. Further, in FIGS. 7 and 8, the space region S1 is hatched with a one-dot chain line.

[0031] In the present embodiment, the drive unit 31 is disposed on the motor 32. As can be understood from FIGS. 4, 7, 8, etc., the drive unit 31 is not disposed in the above-described space region S1. As shown in FIG. 6, the motor 32 is fixed to the third wall portion 23. For example, as shown in the figure, a cylindrical fixing member 291 is fitted into the through hole 232 of the third wall portion 23, and a screw member 292 is screwed to the side portion of the motor 32. When attaching the motor 32 (wire feeding mechanism 3) to the third wall portion 23, as shown in FIG. 8, by moving the motor 32 from the other side Y2 in the first direction through the opening 24 of the metal structure 2 to the one side Y1 in the first direction, the motor 32 can be disposed in the above-described space region S1. Note that the method of fixing the motor 32 to the third wall portion 23 is not limited to the above-described screw fastening.

[0032] The handle 4 is a portion that is gripped by hand when an operator carries the wire feeding device A1. The handle 4 is disposed at an upper portion of the case 1 (upper case 1B) closer to the rear X2 in the feeding direction. The handle 4 has a substantially U shape, and both end portions of the handle 4 are rotatably attached to the upper case 1B about an axis along the first direction Y. In FIGS. 1 to 4, the handle 4 is shown in a stored state. When gripping the handle 4, the handle 4 can be rotated about the above-described axis to an upright state.

[0033] The cover 6 is provided on the case 1 (lower case 1A) and covers at least a part of the bottom wall 11. In the present embodiment, the cover 6 includes a first cover 61 and a second cover 62. The first cover 61 is disposed at the end of the case 1 in the forward X1 direction of the feeding direction. The first cover 61 covers the end of the bottom wall 11 in the forward X1 direction of the feeding direction. Also, the first cover 61 overlaps the entire joint portion 53 when viewed in the first direction Y and covers the joint portion 53 in the first direction Y. The second cover 62 is disposed near the end of the case 1 in the rearward X2 direction of the feeding direction. The second cover 62 covers the vicinity of the end of the bottom wall 11 in the forward X1 direction of the feeding direction. By providing the cover 6 (the first cover 61 and the second cover 62) on the case 1 (lower case 1A), it is prevented that the outer surface of the lower case 1A (bottom wall 11) directly contacts the floor surface of the workplace or the like, and the case 1 is protected.

[0034] Next, the operation of the present embodiment will be described.

[0035] The wire feeding device A1 of the present embodiment includes a metal structure 2 and a wire feeding mechanism 3. The metal structure 2 is composed of a metal conductor and is a member through which a welding current flows. The metal structure 2 includes a first wall portion 21, a second wall portion 22, and a third wall portion 23. The first wall portion 21 and the second wall portion 22 are spaced apart in the forward X1 direction and the rearward X2 direction of the feeding direction. The first wall portion 21 and the second wall portion 22 overlap each other when viewed in the feeding direction X. The third wall portion 23 is connected to each of the first wall portion 21 and the second wall portion 22 at a position biased to one side Y1 in the first direction. The wire feeding mechanism 3 includes a driving portion 31 and a motor 32. At least a part of the motor 32 is disposed in a space region S1 surrounded by the first wall portion 21, the second wall portion 22, and the third wall portion 23 when viewed in the second direction Z (vertical direction) and overlapping the third wall portion 23 when viewed in the first direction Y.

[0036] According to such a configuration, in the metal structure 2 for passing a welding current, the inner space region S1 surrounded by the first wall portion 21, the second wall portion 22, and the third wall portion 23 serves as the accommodation space for the motor 32. The first wall portion 21, the second wall portion 22, and the third wall portion 23 are arranged at positions corresponding to three sides of a rectangle when viewed in the second direction Z. Further, the first wall portion 21, the second wall portion 22, and the third wall portion 23 are arranged asymmetrically in the left-right direction (first direction Y) with respect to the center line along the feeding direction X when viewed in the second direction Z. Thereby, the motor 32 can be efficiently arranged in the space region S1 formed by the metal structure 2 with space saving. Therefore, the strength of the metal structure 2 including the first wall portion 21, the second wall portion 22, and the third wall portion 23 is improved, and in the wire feeding device A1, the assembly and replacement of the metal structure 2 and the wire feeding mechanism 3 are easy, and the assemblability and maintainability are excellent.

[0037] The motor 32 is fixed to the third wall portion 23. According to such a configuration, the overall rigidity and strength of the metal structure 2 (the third wall portion 23) and the wire feeding mechanism 3 (the motor 32) fixed thereto are appropriately improved.

[0038] The metal structure 2 has an opening 24. The opening 24 opens to the other side Y2 in the first direction with respect to the third wall portion 23. According to the configuration having the opening 24 on the side opposite to the third wall portion 23 in the first direction Y in this way, when the motor 32 (the wire feeding mechanism 3) is attached to the third wall portion 23, the motor 32 is moved from the other side Y2 in the first direction through the opening 24 of the metal structure 2 to the one side Y1 in the first direction. Thereby, the motor 32 can be arranged in the above space region S1. Therefore, the attachment and detachment of the motor 32 during maintenance can be performed easily and smoothly.

[0039] In the first wall portion 21 and the second wall portion 22, a first wire insertion port 211 and a second wire insertion port 221 for passing the welding wire W are formed in a penetrating manner along the feeding direction X. According to such a configuration, the arrangement of the metal structure 2 can be made space-saving, and the miniaturization and weight reduction of the wire feeding device A1 can be achieved.

[0040] The metal structure 2 includes a gas passage 27 and a coolant passage 28 (fluid passage). The gas passage 27 is a hollow passage for flowing shield gas (gas). The coolant passage 28 is a hollow passage for flowing cooling water (coolant). The gas passage 27 and the coolant passage 28 are formed across the first wall portion 21, the second wall portion 22, and the third wall portion 23. Thereby, the metal structure 2 itself, which is the path of the welding current, has the hollow gas passage 27 and the coolant passage 28. According to the present embodiment, different from a configuration in which a power supply conductor, a gas pipe, and a water cooling hose are respectively arranged inside the wire feeding device (for example, the configuration described in Patent Document 1), the paths for flowing the welding current, the shield gas, and the cooling water can be covered by the metal structure 2. Thereby, in the wire feeding device A1 including the metal structure 2, the assembly and replacement of the metal structure 2 are easy, and it is excellent in assemblability and maintainability.

[0041] Different from the present embodiment, for example, when a water cooling hose is arranged inside the wire feeding device, there is a possibility that the heat-resistant temperature of the water cooling hose may be exceeded under welding conditions with high current or high usage rate, and restrictions on the welding conditions may occur. On the other hand, in the present embodiment, cooling water flows through the hollow passage (coolant passage 28) of the metal structure 2 made of a metal conductor. Therefore, welding with high current or high usage rate is possible without being restricted by welding conditions.

[0042] In the present embodiment, the constituent material of the metal structure 2 contains aluminum. Aluminum has a lower density than other metal conductors such as copper and iron, for example. According to such a configuration, the strength of the entire wire feeding device A1 can be increased, and the weight reduction of the wire feeding device A1 can be achieved.

[0043] The embodiments of the present invention have been described above. However, the scope of the present invention is not limited to the above-described embodiments, and all modifications within the scope of the matters described in each claim are included in the scope of the present invention.

[0044] In the above embodiment, the case where the metal structure 2 includes both the gas passage 27 and the coolant passage 28 has been described. However, the present invention is not limited to this, and a configuration including only one of the gas passage 27 and the coolant passage 28 may be used. Further, the metal structure 2 may have a configuration that does not include any of the gas passage 27 and the coolant passage 28 (fluid passage).

[0045] In the above embodiment, the case where the third wall portion 23 of the metal structure 2 is connected to a position biased in the horizontal direction (one side of the first direction Y) with respect to the first wall portion 21 and the second wall portion 22 has been described. However, the present invention is not limited to this. For example, the third wall portion 23 may be configured to be connected to a position biased in the vertical direction with respect to the first wall portion 21 and the second wall portion 22. In this case, the third wall portion 23 is connected to the lower end portions of the first wall portion 21 and the second wall portion 22, respectively.

Explanation of Reference Numerals

[0046] A1: Wire feeding device, 2: Metal structure, 21: First wall portion, 211: First wire insertion port, 22: Second wall portion, 221: Second wire insertion port, 23: Third wall portion, 24: Opening, 27: Gas passage (fluid passage), 28: Coolant passage (fluid passage), 3: Wire feeding mechanism, 31: Driving portion, 32: Motor, S1: Space region, W: Welding wire, X: Feeding direction, X1: Front in the feeding direction (one side of the feeding direction), X2: Rear in the feeding direction (the other side of the feeding direction), Y: First direction, Y1: One side of the first direction, Y2: The other side of the first direction, Z: Second direction

Claims

1. A wire feeding device comprising a metal structure for passing a welding power source and a wire feeding mechanism for feeding a welding wire, The metal structure includes a first wall portion, a second wall portion, and a third wall portion, The wire feeding mechanism includes a driving portion and a motor for driving the driving portion, The first wall portion and the second wall portion are spaced apart on one side and the other side in the feeding direction of the welding wire, and overlap each other when viewed in the feeding direction, The third wall portion is connected to each of the first wall portion and the second wall portion at a position biased to one side in a first direction orthogonal to the feeding direction, At least a part of the motor is disposed in a space region surrounded by the first wall portion, the second wall portion, and the third wall portion when viewed in a second direction orthogonal to both the feeding direction and the first direction, and overlapping the third wall portion when viewed in the first direction.

2. The wire feeding device according to claim 1, wherein the motor is fixed to the third wall portion.

3. The wire feeding device according to claim 2, wherein the metal structure has an opening that opens to the other side in the first direction with respect to the third wall portion.

4. The wire feeding device according to any one of claims 1 to 3, wherein the first wall portion and the second wall portion are each provided with a first wire insertion hole and a second wire insertion hole that penetrate along the feeding direction for passing the welding wire.

5. The wire feeding device according to any one of claims 1 to 4, wherein the metal structure is formed across the first wall portion, the second wall portion, and the third wall portion, and includes a hollow fluid passage for flowing a fluid.

Images