JP2015142926A - Reciprocal drive mechanism of weld wire and welding device having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reciprocal drive mechanism of a weld wire capable of performing a reciprocal operation of feeding and retracting the weld wire at a higher speed, minimizing the occurrence of unnecessary vibration, and stably feeding the weld wire.SOLUTION: A reciprocal drive mechanism 300 of a weld wire comprises: a wire guide 400 with at least a portion having flexibility, into which a weld wire W to be fed toward a weld torch 200 is inserted; and a torch body part 230 for accommodating one end 421 of the wire guide 400 in a curved state while fixing the one end 421. The reciprocal drive mechanism 300 changes the curved state by allowing the other end 412 of the wire guide 400 to reciprocate in its axial direction and applies a reciprocating motion in a feeding direction to the weld wire W. The reciprocal drive mechanism 300 also comprises a first motion body 310 to be reciprocated while holding the other end 412 of the wire guide 400, and a second motion body 320 to be reciprocated in the opposite direction of the reciprocating motion of the first motion body 310.

Description

  The present invention relates to a welding wire reciprocating drive mechanism for imparting axial reciprocating motion to a welding wire fed toward the tip of a welding torch, and a welding apparatus including the same.

  In the consumable electrode gas shielded arc welding, generally, a welding wire as a filler material wound around a wire reel is sent out to a welding torch by a wire feeding device. Generally, the wire feeding device includes a feeding roller for feeding a welding wire and a drive motor for driving the feeding roller to rotate. In a welding apparatus for performing automatic welding equipped with a manipulator such as an articulated robot, the wire feeding device is mounted on the manipulator, and a welding torch is provided on the wrist portion of the manipulator. In such a welding apparatus, the wire feeding drive motor is provided, for example, in the vicinity of the welding torch, the part away from the welding torch, or both. By controlling the drive motor, the welding wire is stably fed to the welding torch and the welding wire feeding speed is appropriately changed to maintain the welding quality (for example, patent document). 1).

  The welding torch includes a torch body portion in which an internal housing space for passing a welding wire is formed. The welding wire is introduced into the inside of the welding torch through the wire introduction portion on the base end side of the torch main body, and is led out of the welding torch through the wire lead-out portion on the tip side of the torch main body. The welding wire that has passed through the wire feeding device is inserted into, for example, a cylindrical wire guide, and is fed to the wire lead-out portion while being guided by the wire guide. The welding wire that has passed through the wire guide is inserted into the power feed tip at the tip of the welding torch.

  In consumable electrode gas shielded arc welding, it is necessary to appropriately generate an arc between a welding wire held on a power supply tip of a welding torch and a base material to be welded. During welding, the tip of the welding wire is sequentially melted by the heat of the arc and drops as a droplet on the base metal. When the wire tip and the base material are short-circuited via this droplet, the welding spatter is generated and the welding quality is increased. May be reduced. In order to avoid such inconvenience at the time of welding and form an appropriate weld bead, the welding wire is not sent out from the welding torch at a constant speed, but is repeatedly fed out and pulled back at a high speed and at a desired average speed. It is desirable to send out. In order to realize such a welding wire feeding form with an existing wire feeding device, it is only necessary to control the feed roller drive motor to switch between the forward rotation direction and the reverse rotation direction. Due to the influence, it has been substantially difficult to instantaneously switch between forward rotation and reverse rotation of the drive motor at high speed.

  To solve such a problem, a technique has been proposed in which the welding wire is reciprocated in the axial direction by swinging the wire guide inside the welding torch (see, for example, Patent Document 2). In the welding torch described in Patent Document 2, the welding wire feeding direction on the proximal end side (wire introduction portion) of the welding torch body and the welding wire feeding direction on the distal end side (wire lead-out portion) intersect each other. The wire guide provided in the welding torch body is bent. Then, by swinging the wire guide in the main body of the welding torch in a direction intersecting (substantially orthogonal) with the feeding direction of the welding wire in the wire introducing portion, the welding wire inserted through the wire guide is also on the proximal end side. Swing in a direction crossing the feeding direction. As a result, the welding wire is reciprocated along the axial direction on the distal end side (near the wire lead-out portion) of the welding torch main body. By controlling the swing cycle of the wire guide, the welding wire can be moved alternately in the forward direction and the backward direction. According to such a configuration, for example, the welding wire can be fed out and pulled back at a relatively high speed without switching the forward rotation direction and the reverse rotation direction of the drive motor for feeding the wire.

  However, according to the welding torch having the conventional structure, in order to swing the wire guide in the welding torch main body, the wire guide needs to have a relatively high rigidity and requires a certain amount of mass. And Therefore, when such a wire guide is swung (vibrated) in a direction orthogonal to the wire feeding direction, the influence of the vibration of the wire guide may affect the entire welding torch, leading to a decrease in welding quality.

JP 11-226733 A JP 2003-10970 A

  The present invention has been conceived under such circumstances, and can reciprocate the welding wire in and out at a higher speed, and can generate unnecessary vibration as much as possible. It is an object of the present invention to provide a welding wire reciprocating drive mechanism and a welding apparatus provided with the same, which are capable of suppressing and stably feeding the welding wire.

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

  A reciprocating drive mechanism for a welding wire provided by the first aspect of the present invention includes a wire guide in which a welding wire fed toward a welding torch is inserted and at least part of which is flexible, and the wire guide. And a storage chamber for storing the wire guide in a bent state while fixing one end thereof, and changing the bent state by reciprocating the other end of the wire guide in the axial direction to reciprocate the welding wire in the feeding direction. A welding wire reciprocating drive mechanism for imparting motion, the first moving body being reciprocated while holding the other end of the wire guide, and a reciprocating motion in a direction opposite to the reciprocating motion of the first moving body. A second moving body to be moved.

  In a preferred embodiment, the first moving body is a first swinging arm that is swingably supported at one end and holds the other end of the wire guide at the other end. The body is a second swing arm that is swingably supported at one end, and the first swing arm and the second swing arm are mutually connected by a swing mechanism driven by a motor. Is swung in the opposite direction.

  In a preferred embodiment, the second swing arm holds the wire guide so as to be slidable in the axial direction thereof.

  In a preferred embodiment, the second swing arm has mass adjusting means.

  In a preferred embodiment, the mass adjusting means is a weight formed on the second swing arm.

  In a preferred embodiment, the swing mechanism is connected to a connecting member integral with the output shaft of the motor so that one end thereof is rotatable about a position displaced from the center of the output shaft. A first crank member having the other end pivotably connected to an intermediate portion of one swing arm, and the connecting member opposite to one end of the first crank member from the center of the output shaft. A second crank member having one end pivotably connected around a position displaced to the side, and the other end pivotally connected to an intermediate portion of the second swing arm. Yes.

  In a preferred embodiment, the swing mechanism includes a cam member integral with the output shaft of the motor, a first cam follower formed on the first swing arm and engaged with the cam member, An engagement position of the first cam follower in the cam member and a second cam follower that engages on the opposite side across the center of the output shaft are formed on the second swing arm.

  In a preferred embodiment, the welding wire is inserted, and at least a part of the additional wire guide having flexibility, and an additional storage chamber for storing the additional wire guide in a curved state while fixing one end thereof. The other end of the additional wire guide is held by the second moving body and faces the other end of the wire guide.

  In a preferred embodiment, the welding wire reciprocating drive mechanism is provided in a welding torch.

  A welding apparatus provided by the second aspect of the present invention includes a welding wire reciprocating drive mechanism according to the first aspect, and the welding wire is fed to the welding torch via the welding wire reciprocating drive mechanism. .

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

It is a whole lineblock diagram showing an example of a welding device provided with a reciprocating drive mechanism of a welding wire of the present invention. It is a longitudinal cross-sectional view which shows the reciprocating drive mechanism of the welding wire which concerns on 1st Embodiment of this invention. It is sectional drawing which follows III-III of FIG. It is a principal part schematic sectional drawing in alignment with IV-IV of FIG. It is a principal part schematic sectional drawing in alignment with VV of FIG. It is a figure for demonstrating operation | movement of the reciprocating drive mechanism of the welding wire shown in FIG. It is a figure for demonstrating operation | movement of the reciprocating drive mechanism of the welding wire shown in FIG. It is a longitudinal cross-sectional view which shows the reciprocating drive mechanism of the welding wire which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating operation | movement of the reciprocating drive mechanism of the welding wire shown in FIG. It is a longitudinal cross-sectional view which shows the reciprocating drive mechanism of the welding wire which concerns on 3rd Embodiment of this invention. It is a figure for demonstrating operation | movement of the reciprocating drive mechanism of the welding wire shown in FIG. It is a longitudinal cross-sectional view which shows the modification of the reciprocating drive mechanism of the welding wire which concerns on 3rd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the reciprocating drive mechanism of the welding wire which concerns on 4th Embodiment of this invention. It is a figure for demonstrating operation | movement of the reciprocating drive mechanism of the welding wire shown in FIG. An example of the wire velocity diagram at the time of the drive of the reciprocating drive mechanism of a welding wire is shown.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an overall configuration diagram showing an example of a welding apparatus 100 to which a welding wire reciprocating drive mechanism 300 (FIGS. 2 to 5) of the present invention is applied. The welding apparatus 100 includes a manipulator 110 configured as an articulated robot including a plurality of arms. A wire feeding device 111 is mounted on the manipulator 110, and a welding torch 200 is attached to the wrist 112 of the manipulator 110. A welding wire W (see FIG. 2) wound around the wire reel 120 is passed through a conduit cable 130 and fed to the welding torch 200 by a wire feeding device 111. The welding wire W that has passed through the wire feeding device 111 is guided by the one-wire power cable 140 and fed inside thereof.

  The welding torch 200 is supplied with electric power from the welding power supply device 190 via the one-wire power cable 140, and this electric power is supplied to the welding wire W via a power feed tip 233 described later inside the welding torch 200. The welding torch 200 is also supplied with shielding gas from the gas cylinder 150. Supply and stop of shield gas and supply and stop of compressed air are performed by switching a valve device (not shown).

  A command signal is input from the teach pendant 170 to the robot controller 180, and a signal from the robot controller 180 is input to the manipulator 110 to control the tip position of the welding torch 200. The robot controller 180 also controls the feeding of the welding wire W, the feeding of shield gas, and the feeding of compressed air for air blowing. The robot controller 180 also supplies power to a welding wire reciprocating drive mechanism 300 (not shown in FIG. 1) provided on the welding torch 200, which will be described later.

  2 to 5 show a first embodiment of a welding wire reciprocating drive mechanism (hereinafter referred to as “reciprocating drive mechanism”) according to the present invention. In this embodiment, the welding torch 200 includes a reciprocating drive mechanism. 300 is incorporated.

  A welding torch 200 shown in FIG. 2 is configured to perform consumable electrode gas shielded arc welding, and includes a cylindrical wire introduction portion 210 coupled to the wrist portion 112 of the manipulator 110, and the wire introduction portion 210. And a torch body portion 230 continuous to the housing portion 220. The torch main body 230 has a wire lead-out portion 240 at the tip thereof.

  The housing part 220 has an accommodation space 220 a that communicates with the wire introduction part 210. The torch main body 230 has a torch body 231 having an internal space 231 a communicating with the housing space 220 a and a tip body 232 connected to the tip of the torch body 231. A power feed tip 233 made of a conductive member is attached to the tip of the tip body 232 (wire lead-out portion 240).

  The torch main body 230 is curved at the intermediate portion 230a, and the inlet portion 230b and the wire lead-out portion 240 communicating with the accommodation space 220a of the housing portion 220 have axes that intersect with each other. The internal space 231a is formed to be curved in a plane including these axial centers (a plane P extending in the in-plane direction of the paper surface in FIG. 2). The axial center of the inlet portion 230 b coincides with the axial center of the wire introducing portion 210. Further, the internal space 231a is formed such that the width along the plane P gradually increases as it goes from the proximal end to the distal end of the torch main body 230, and gradually decreases after reaching the maximum. On the other hand, the width of the internal space 231a in the direction perpendicular to the plane P corresponds to the outer diameter of the second portion 420 of the wire guide 400 to be described later (the fluctuation in the direction perpendicular to the plane P). ) Can be prevented. That is, the cross section of the internal space 231a has a long axis in the plane P direction as shown in FIG. 3 and a short axis corresponding to the outer diameter of the wire guide 400 in the direction perpendicular to the plane P. Long rectangular shape. The torch body 231 is covered with, for example, an insulating shrink tube (not shown).

  A wire guide 400 for guiding the welding wire W fed to the welding torch 200 to the power feed tip 233 is provided in the housing space 220 a of the housing part 220 or the internal space 231 a of the torch body part 230. The wire guide 400 has a cylindrical shape as a whole, and includes a first portion 410 that is mostly located in the housing portion 220 and a second portion 420 that is mostly located in the torch body portion 230. The first portion 410 has a rigidity and extends in a straight line, and is formed of, for example, a metal pipe. The inlet portion 411 of the first portion 410 is expanded in diameter and partially enters the wire introducing portion 210. The second portion 420 has flexibility and extends in a curved shape in the internal space 231 a of the torch main body 230, and the tip 421 is fixed to the wire lead-out portion 240. As this second portion 420, for example, a coil liner configured by winding a metal wire in a coil shape can be used. A series of welding wires W fed to the welding torch 200 and introduced from the wire introduction part 210 are inserted and guided through the wire guide 400, and are led out through the wire lead-out part 240 and the power feed tip 233. .

  A reciprocating drive mechanism 300 for applying a reciprocating motion in the feeding direction to the welding wire W by reciprocating the first portion 410 of the wire guide 400 in the axial direction is provided in the housing space 220a of the housing portion 220. .

  The reciprocating drive mechanism 300 holds the first portion 410 of the wire guide 400 and reciprocates in the axial direction thereof, and reciprocates in a direction opposite to the reciprocating motion of the first moving body 310. A second moving body 320 to be moved.

  In the present embodiment, the first moving body 310 holds the first portion 410 of the wire guide 400 at the tip, and is positioned laterally (downward in FIG. 2) with respect to the axis of the first portion 410. The swing center 311 is configured by a first swing arm 312 that can swing in a plane including the axis of the first portion 410 (in a plane along the plane of the paper in FIG. 2). The second moving body 320 includes a second swing arm 322 that extends in parallel with the first swing arm 312. The second swing arm 322 has a swing center 321 at a position separated from the swing center 311 of the first swing arm 312 in the axial direction of the first portion 410 (left and right direction in FIG. 2). It can swing within a plane including the axis of the portion 410. In the present embodiment, the second swing arm 322 is provided with a weight 325. The weight 325 may be formed integrally with the second swing arm 322, or a plurality of different weights may be detachably attached to the second swing arm 322. can do. The significance of the weight 325 will be described later.

  The first swing arm 312 and the second swing arm 322 are driven by a motor 330 in which an output shaft 331 is disposed at an intermediate position between the first swing arm 312 and the second swing arm 322 (FIG. 4). , See FIG. 5). One end of the first crank member 340 is rotatably connected to the output shaft 331 at a first eccentric position O1 with respect to the axis Ox. The other end of the first crank member 340 is rotatably connected to the intermediate portion of the first swing arm 312. In addition, one end of the second crank member 350 is located at a second eccentric position O2 that is eccentric to the output shaft 331 by the same distance on the opposite side of the first eccentric position O1 across the axis Ox of the output shaft 331. It is connected rotatably. The other end of the second crank member 350 is rotatably connected to an intermediate portion of the second swing arm 322. This will be described in more detail below.

  As shown in FIGS. 4 and 5, the first crank member 340 and the second crank member 350 are connected to the output shaft 331 via a connecting member 360. The connecting member 360 is fitted around the output shaft 331 of the motor 330 and is fixed to the output shaft 331. The connecting member 360 has a first eccentric shaft portion 361 and a second eccentric shaft portion 362. The first eccentric shaft portion 361 and the second eccentric shaft portion 362 are formed at different positions in the axial center Ox direction of the output shaft 331.

  The first eccentric shaft portion 361 has an outer peripheral surface with a circular cross section centered on the first eccentric position O1, and the inner ring 371 of the bearing 370 is press-fitted and held on the outer peripheral surface. The first crank member 340 has a first end side cylindrical portion 341 and a second end side cylindrical portion 342, and the first end side cylindrical portion 341 is externally fitted to the outer ring 372 of the bearing 370. Further, the other end side cylindrical portion 342 is parallel to the axis Ox of the output shaft 331 from the intermediate position of the first swing arm 312 and closer to the first eccentric shaft portion 361 in the direction in which the axis Ox extends. The extending pin 313 is inserted through a slight gap (see FIG. 4). With such a configuration, one end of the first crank member 340 is centered on the first eccentric position O1 displaced from the axis Ox (center) of the output shaft 331 with respect to the connecting member 360 integral with the output shaft 331. As shown in FIGS. 2 and 5. Further, the other end of the first crank member 340 is rotatably connected to an intermediate portion of the first swing arm 312.

  The second eccentric shaft portion 362 has an outer circumferential surface with a circular cross section centered on the second eccentric position O2, and the inner ring 381 of the bearing 380 is press-fitted and held on the outer circumferential surface. The second crank member 350 has a one end side cylinder portion 351 and the other end side cylinder portion 352, and the one end side cylinder portion 351 is externally fitted to the outer ring 382 of the bearing 380. Further, the other end side cylindrical portion 352 is parallel to the axis Ox of the output shaft 331 from the intermediate position of the second swing arm 322 and closer to the second eccentric shaft portion 362 in the direction in which the axis Ox extends. The extending pin 323 is inserted through a slight gap (see FIG. 4). With such a configuration, one end of the second crank member 350 is spaced from the axial center Ox on the opposite side to the first eccentric position O1 with respect to the connecting member 360 across the axial center Ox (center) of the output shaft 331. The second eccentric position O2 that has been displaced is connected to be pivotable (see FIGS. 2 and 5). Further, the other end of the second crank member 350 is rotatably connected to an intermediate portion of the second swing arm 322.

  As shown in FIG. 4, the first swing arm 312 and the second swing arm 322 are located on the opposite side across the axis Ox of the output shaft 331, and in the direction in which the axis Ox extends. The distance from the motor 330 is at the same position. Although details will be described later, when the motor 330 is driven to rotate by such a configuration, the first swing arm 312 and the second swing arm 322 are along a plane including the axis of the first portion 410 of the wire guide 400. And swing in opposite directions.

  As shown in FIG. 2, the cylindrical portion 314 at the tip of the first swing arm 312 has a large diameter portion 412 at one end of the first portion 410 of the wire guide 400 parallel to the axis Ox of the output shaft 331. It is held so as to be rotatable around the axis. The cylindrical portion 324 at the tip of the second swing arm 322 has an inner diameter larger than the outer diameter of the first portion 410, and the first portion 410 is inserted through the cylindrical portion 324. Thus, the cylindrical portion 324 (second swing arm 322) holds the first portion 410 (wire guide 400) so as to be slidable in the axial direction thereof. For example, a resin tube (not shown) for reducing sliding resistance with the cylindrical portion 324 may be mounted on the outer periphery of the first portion 410.

  Next, the operation of the reciprocating drive mechanism 300 will be described.

  When the output shaft 331 of the motor 330 is rotationally driven, the connecting member 360 is rotated, and the first crank member 340 and the second crank member 350 are rotated with respect to the connecting member 360. More specifically, when the output shaft 331 rotates 90 ° counterclockwise (in the direction of arrow N1 in the figure) from the state shown in FIG. 2, the state shown in FIG. 6 is obtained. As shown in FIG. 6, the first eccentric position O1 and the first crank member 340 are displaced to the rightmost side. Along with the displacement of the first crank member 340, the first swing arm 312 whose intermediate portion is rotatably connected to the other end of the first crank member 340 swings around the swing center 311. Move. The first swing arm 312 shown in FIG. 6 is in a state where the cylindrical portion 314 (upper end in the figure) at the tip is displaced to the rightmost side.

  At this time, the first portion 410 (large diameter portion 412) of the wire guide 400 held by the cylindrical portion 314 at the tip of the first swing arm 312 moves to the rightmost side. Here, since the distal end 421 of the second portion 420 having flexibility is fixed to the wire lead-out portion 240, the second portion 420 is indicated by an arrow N <b> 2 in the internal space 231 a as the first portion 410 moves to the right. It is displaced to the convex side of the curved shape. Then, with respect to the welding wire W guided by the wire guide 400 (second portion 420), the path length in the torch main body 230 is longer than that shown in FIG. 2, and the welding wire W is pulled back.

  On the other hand, the second eccentric position O2 and the second crank member 350 that are eccentric by the same distance on the opposite side of the first eccentric position O1 across the axis Ox of the output shaft 331, as shown in FIG. Displaces to the left. Along with the displacement of the second crank member 350, the second swing arm 322 whose intermediate portion is rotatably connected to the other end of the second crank member 350 swings around the swing center 321. Move. The second swing arm 322 shown in FIG. 6 is in a state where the cylindrical portion 324 (upper end in the drawing) at the tip is displaced to the leftmost side.

  As described above, when the output shaft 331 rotates 90 ° from the state shown in FIG. 2 to the state shown in FIG. 6, the first swing arm 312 and the second swing arm 322 have their distal ends (cylindrical portion 314). And the cylindrical portion 324) swings in directions opposite to each other so as to move away from each other. Since the first crank member 340 is connected to the intermediate portion of the first swing arm 312, the displacement amount of the tip (cylindrical portion 314) of the first swing arm 312 is the displacement of the intermediate portion. About twice the amount.

  Next, when the output shaft 331 is further rotated 180 ° counterclockwise from the state shown in FIG. 6, the state shown in FIG. 7 is obtained. At this time, the first eccentric position O1 and the first crank member 340 are displaced to the leftmost side. Along with the displacement of the first crank member 340, the first swing arm 312 whose intermediate portion is rotatably connected to the other end of the first crank member 340 swings around the swing center 311. Move. The first swing arm 312 shown in FIG. 7 is in a state where the cylindrical portion 314 (upper end in the drawing) at the tip is displaced to the leftmost side.

  Here, the first portion 410 (large diameter portion 412) held by the cylindrical portion 314 at the tip of the first swing arm 312 moves to the leftmost side. Since the distal end 421 of the second portion 420 having flexibility is fixed to the wire lead-out portion 240, the second portion 420 is curved as indicated by the arrow N3 in the internal space 231a as the first portion 410 moves to the left. Displace to the concave side of the shape. Then, with respect to the welding wire W guided by the wire guide 400, the path length in the torch body 230 is minimized, and the welding wire W is sent out.

  On the other hand, the second eccentric position O2 and the second crank member 350 that are eccentric by the same distance on the opposite side of the first eccentric position O1 across the axis Ox of the output shaft 331, as shown in FIG. Displaces to the right. Along with the displacement of the second crank member 350, the second swing arm 322 whose intermediate portion is rotatably connected to the other end of the second crank member 350 swings around the swing center 321. Move. The second swing arm 322 shown in FIG. 7 is in a state where the cylindrical portion 324 (upper end in the drawing) at the tip is displaced to the rightmost side.

  As described above, when the output shaft 331 rotates 180 ° from the state shown in FIG. 6 to the state shown in FIG. 7, the first swing arm 312 and the second swing arm 322 have their distal ends (cylindrical portion 314). And oscillate in opposite directions so that the cylindrical part 324) approaches.

  As can be understood with reference to FIGS. 2, 6, and 7, when the motor 330 is driven to rotate, the first swing arm 312 swings back and forth around the swing center 311 within a predetermined angle range. . The first portion 410 (large diameter portion 412) held by the cylindrical portion 314 at the tip of the first swing arm 312 is reciprocated within a predetermined length range, and the welding wire W in the torch main body portion 230 is The pull back and the feed are alternately repeated. Further, the second swing arm 322 is always reciprocally swung in the direction opposite to the swing direction of the first swing arm 312. Here, when the output shaft 331 of the motor 330 rotates once, the first swing arm 312 swings one reciprocating motion, and the welding wire W performs one reciprocating motion (retraction operation and delivery operation once each). I do. For example, if the rotation number of the motor 330 is kept constant at about 6,000 rpm, the frequency of operation of the welding wire W is about 100 Hz.

  Next, operations of the welding apparatus 100 and the reciprocating drive mechanism 300 according to the above-described embodiment will be described.

  During the welding operation, the reciprocating drive mechanism 300 causes the first portion 410 (large diameter portion 412) of the wire guide 400 held by the cylindrical portion 314 at the tip of the first swing arm 312 to reciprocate in the axial direction. The welding wire W can be reciprocated at high speed along the axial direction at the tip of the welding torch 200 (near the wire lead-out portion 240). Since the motor 330 is used while being rotated in only one direction, for example, the welding motor W of the wire feeding device 111 can be fed and pulled back at a high speed without switching the forward rotation or the reverse rotation of the driving motor. Can be repeated. This is suitable for avoiding a short-circuit phenomenon occurring between the tip of the welding wire W and the base material during welding, and is preferable for improving the welding quality.

  Since the second portion 420 of the wire guide 400 has flexibility, the curved state of the wire guide 400 changes within a predetermined range while the wire guide 400 remains curved due to the reciprocation of the first portion 410 in the axial direction. As a result, the welding wire W guided by the wire guide 400 is prevented from being deformed and can be smoothly moved relative to the wire guide 400 while changing the path length in the torch body 230. As a result, the welding wire W can be fed smoothly.

  The reciprocating drive mechanism 300 includes a second swing arm 322 (second motion body 320) that can be reciprocated in the opposite direction to the reciprocation of the first swing arm 312 (first motion body 310). Yes. According to such a configuration, the inertial force generated when the first swing arm 312 reciprocates at an operating frequency of 100 Hz or more causes the second swing that moves in the opposite direction to the first swing arm 312. It is canceled out by the moving arm 322. Therefore, the occurrence of vibration due to the inertial force during the reciprocating motion of the first swing arm 312 is suppressed. Suppression of vibration during welding is preferable for improving welding quality.

  In the present embodiment, a weight 325 is provided on the second swing arm 322. As a result, it is possible to balance the weight with the wire guide 400 held by the first swing arm 312 and reciprocally moved, and the generation of vibrations can be efficiently suppressed.

  The other end of the first crank member 340 is connected to the middle portion of the first swing arm 312 so as to be rotatable. According to such a configuration, when the first swing arm 312 swings back and forth, the displacement amount of the cylindrical portion 314 at the tip of the first swing arm 312 is approximately twice the displacement amount of the intermediate portion. Therefore, it is suitable for increasing the stroke of the reciprocating motion in the axial direction of the first portion 410 (wire guide 400) held by the cylindrical portion 314 at the tip of the first swing arm 312.

  The second swing arm 322 (cylindrical portion 324) holds the first portion 410 (wire guide 400) so as to be slidable in the axial direction thereof. According to such a configuration, since the first part 410 to be reciprocated is guided by the second swing arm 322 and keeps substantially the same posture, it is possible to suppress the generation of inappropriate vibration.

  8 to 14 show other embodiments of the welding wire reciprocating drive mechanism according to the present invention. In FIG. 8 and subsequent figures, the same or similar elements as those in the above embodiment are denoted by the same reference numerals as those in the above embodiment, and description thereof will be omitted as appropriate.

  8 and 9 show a reciprocating drive mechanism according to the second embodiment of the present invention. The reciprocating drive mechanism 300A of this embodiment is greatly different from the reciprocating drive mechanism 300 described above in that a wire guide 500 (additional wire guide) is held at the tip of the second swing arm 322. Various changes have been made accordingly. The reciprocating drive mechanism 300A does not include the weight 325 of the reciprocating drive mechanism 300 shown in FIG.

  The wire guide 500 has substantially the same configuration as the wire guide 400, and includes a first portion 510 that is rigid and extends linearly, and a second portion 520 that is flexible. In the present embodiment, the first portion 410 has a dimension from one end (large diameter portion 412) held by the first swing arm 312 to the opening at the other end compared to the reciprocating drive mechanism 300 described above. Small. The first portion 510 of the wire guide 500 has the same configuration as the first portion 410 of the wire guide 400, and the opening end of the first portion 510 faces the opening end of the first portion 410. Opposing end portions of the first portions 410 and 510 are inserted into a guide pipe 221 provided in the housing portion 220. A series of welding wires W are inserted through the wire guide 400 and the wire guide 500, respectively.

  The structure for holding the first portion 510 by the tip of the second swing arm 322 is the same as the structure for holding the first portion 410 by the first swing arm 312. That is, the cylindrical portion 326 at the tip of the second swing arm 322 can rotate the large diameter portion 512 at one end of the first portion 510 around an axis parallel to the axis Ox of the output shaft 331. Is holding in.

  A storage chamber 600 for storing the second portion 520 of the wire guide 500 is connected to the wire introduction part 210. The storage chamber 600 has substantially the same shape as the torch body 231 and is arranged so as to be line symmetric with the torch body 231 with respect to a symmetrical axis extending vertically through the axis Ox of the output shaft 331 in FIG. Has been. The storage chamber 600 forms an internal space 600 a that communicates with the storage space 220 a of the housing part 220. The internal space 600a is curved like the internal space 231a of the torch body 231, and the width along the plane P gradually increases from the proximal end to the distal end of the storage chamber 600 and gradually increases after becoming maximum. It is formed to shrink. Although not shown, the tip of the second portion 520 of the wire guide 500 is fixed to the tip of the storage chamber 600.

  When the reciprocating drive mechanism 300A of this embodiment is driven, the first swing arm 312 and the second swing arm 322 swing back and forth in opposite directions as in the case of the reciprocating drive mechanism 300 described above. FIG. 9 shows a state in which the output shaft 331 of the motor 330 has been rotated 90 ° counterclockwise (in the direction of arrow N1 in the figure) from the state shown in FIG. At this time, the first portion 510 (large diameter portion 512) of the wire guide 500 held by the cylindrical portion 326 at the tip of the second swing arm 322 moves to the leftmost side. Here, since the distal end of the flexible second portion 520 is fixed to the distal end portion of the storage chamber 600, the first portion 510 moves to the left in the internal space 600a as the arrow N4 moves. As shown, it is displaced to the convex side of the curved shape.

  As is understood with reference to FIGS. 8 and 9, in this embodiment, the welding wire W guided by the two wire guides 400 and 500 has a path length in the torch main body 230 and the accommodation chamber 600. Becomes longer or shorter in synchronization. Therefore, the stroke of the reciprocating motion (retraction and feeding) along the feeding direction of the welding wire W is about twice that of the reciprocating drive mechanism 300, and the welding wire W is reciprocated with a larger stroke. Can do.

  In the present embodiment, wire guides 400 and 500 are respectively held at the tips (the cylindrical portion 314 and the cylindrical portion 326) of the first swing arm 312 and the second swing arm 322. The first swing arm 312 and the second swing arm 322 swing back and forth in opposite directions. According to such a configuration, there is a weight balance between the wire guide 400 held by the first swing arm 312 and reciprocated, and the wire guide 500 held by the second swing arm 322 and reciprocated. This is an optimal state, and vibrations during driving can be more efficiently suppressed.

    10 and 11 show a reciprocating drive mechanism according to the third embodiment of the present invention. The reciprocating drive mechanism 300B of this embodiment employs a cam mechanism as a mechanism for transmitting the driving force of the motor 330 to the first swing arm 312 and the second swing arm 322. In this respect, the above embodiment is described. And very different.

  In the present embodiment, as shown in FIG. 10, a cam member 390 is externally fixed to the output shaft 331 of the motor 330. The first swing arm 312 and the second swing arm 322 are provided with a first cam follower 317 and a second cam follower 327 that engage with the cam member 390. The first cam follower 317 and the second cam follower 327 are rotatable around an axis parallel to the axis Ox of the output shaft 331 at the intermediate portion of each of the first swing arm 312 and the second swing arm 322. Is provided.

  In the present embodiment, the outer periphery of the cam member 390 is in contact with the outer periphery of each of the first cam follower 317 and the second cam follower 327. In addition, a tension coil spring 391 as an elastic body is provided at the tips of the first swing arm 312 and the second swing arm 322. The tension coil spring 391 applies a force in a direction in which the tips of the first swing arm 312 and the second swing arm 322 are close to each other.

  The cam member 390 has a point-symmetrical shape with an even number of vertices at the engaging portion with the first cam follower 317 and the second cam follower 327. In the present embodiment, the cam member 390 is configured as an elliptical cam having two vertices, and the outer periphery has an elliptical shape.

  Here, the apex of the cam member 390 is a position where the distance from the axial center Ox of the output shaft 331 (the central axis of the cam member 390) is larger than the surroundings at the engagement site. When the cam member 390 is the elliptical cam shown in FIG. 10, the apex of the cam member 390 is two intersections between the long axis and the engagement portion (outer periphery).

  As shown in FIG. 10, the engagement position P1 of the first cam follower 317 and the engagement position P2 of the second cam follower 327 in the cam member 390 are the axis Ox of the output shaft 331 (the central axis of the cam member 390). Is located on the opposite side with respect to the axis Ox, and is located at the same distance from the axis Ox.

  Similar to the reciprocating drive mechanism 300 described above with reference to FIG. 2, the cylindrical portion 314 at the tip of the first swing arm 312 outputs the large diameter portion 412 at one end of the first portion 410 of the wire guide 400. The shaft 331 is held so as to be rotatable around an axis parallel to the axis Ox of the shaft 331. The cylindrical portion 324 at the tip of the second swing arm 322 has an inner diameter larger than the outer diameter of the first portion 410, and the first portion 410 is inserted through the cylindrical portion 324. Thus, the cylindrical portion 324 (second swing arm 322) holds the first portion 410 (wire guide 400) so as to be slidable in the axial direction thereof.

  In the reciprocating drive mechanism 300B of the present embodiment, when the output shaft 331 of the motor 330 is rotationally driven, the cam member 390 rotates and the first swing arm 312 and the second swing arm 322 swing. More specifically, first, in the state shown in FIG. 10, the engagement position P1 of the first cam follower 317 and the engagement position P2 of the second cam follower 317 in the cam member 390 are respectively from the axis Ox of the output shaft 331. It is the closest position. When the output shaft 331 rotates 90 ° counterclockwise (in the direction of arrow N1 in the figure) from the state shown in FIG. 10, the state shown in FIG. 11 is obtained. As shown in FIG. 11, the engagement position P1 of the first cam follower 317 in the cam member 390 is displaced to the position farthest from the axis Ox of the output shaft 331 (right side in the figure), and the apex of the cam member 390 Match. Along with the displacement of the engagement position P1, the first swing arm 312 provided with the first cam follower 317 in the middle swings around the swing center 311. The first swing arm 312 shown in FIG. 11 is in a state where the cylindrical portion 314 (upper end in the figure) at the tip is displaced to the rightmost side.

  At this time, the first portion 410 (large diameter portion 412) of the wire guide 400 held by the cylindrical portion 314 at the tip of the first swing arm 312 moves to the rightmost side. Here, since the distal end 421 of the second portion 420 having flexibility is fixed to the wire lead-out portion 240, the second portion 420 is indicated by an arrow N <b> 2 in the internal space 231 a as the first portion 410 moves to the right. It is displaced to the convex side of the curved shape. Then, with respect to the welding wire W guided by the wire guide 400 (second portion 420), the path length in the torch main body 230 is longer than that shown in FIG. 10, and the welding wire W is pulled back.

  On the other hand, the engagement position P2 of the second cam follower 327 located on the opposite side of the engagement position P1 of the cam member 390 across the axis Ox of the output shaft 331 is, as shown in FIG. 11, the output shaft 331. Is displaced farthest from the axis Ox (left side in the figure) and coincides with the apex of the cam member 390. With the displacement of the engagement position P2, the second swing arm 322 provided with the second cam follower 327 in the middle swings around the swing center 321. The second swing arm 322 shown in FIG. 11 is in a state where the cylindrical portion 324 (upper end in the drawing) at the tip is displaced to the leftmost side.

  In this way, when the output shaft 331 rotates 90 ° from the state shown in FIG. 10 to the state shown in FIG. 11, the first swing arm 312 and the second swing arm 322 are such that their tips are moved away from each other. Oscillate in opposite directions. Since the first cam follower 317 is connected to the intermediate portion of the first swing arm 312, the displacement amount of the tip (cylindrical portion 314) of the first swing arm 312 is the displacement amount of the intermediate portion. About twice as much.

  Next, when the output shaft 331 further rotates 90 ° counterclockwise from the state shown in FIG. 11, the state returns to the state shown in FIG. At this time, the engagement position P1 and the engagement position P2 in the cam member 390 are displaced to positions closest to the axis Ox of the output shaft 331, respectively. Along with the displacement of the engagement position P1, the first swing arm 312 provided with the first cam follower 317 in the middle swings around the swing center 311. The first swing arm 312 shown in FIG. 10 is in a state where the cylindrical portion 314 (upper end in the figure) at the tip is displaced to the leftmost side.

  Here, the first portion 410 (large diameter portion 412) held by the cylindrical portion 314 at the tip of the first swing arm 312 moves to the leftmost side. Since the distal end 421 of the second portion 420 having flexibility is fixed to the wire lead-out portion 240, the second portion 420 is displaced to the concave side of the curved shape in the internal space 231a as the first portion 410 moves to the left. To do. Then, with respect to the welding wire W guided by the wire guide 400, the path length in the torch body 230 is minimized, and the welding wire W is sent out.

  On the other hand, the engagement position P2 located on the opposite side of the engagement position P1 in the cam member 390 across the axis Ox of the output shaft 331 is closest to the axis Ox of the output shaft 331 as shown in FIG. Displace to the position (right side in the figure). With the displacement of the engagement position P2, the second swing arm 322 provided with the second cam follower 327 in the middle swings around the swing center 321. The second swing arm 322 shown in FIG. 10 is in a state where the cylindrical portion 324 (upper end in the figure) at the tip is displaced to the rightmost side.

  As described above, when the output shaft 331 rotates 90 ° from the state shown in FIG. 11 to the state shown in FIG. 10, the first swing arm 312 and the second swing arm 322 have their distal ends (cylindrical portion 314). And oscillate in opposite directions so that the cylindrical part 324) approaches.

  The first swing arm 312 and the second swing arm 322 are subjected to a force in the direction in which the ends are close to each other by the tension coil spring 391. For this reason, when the cam member 390 rotates, the first cam follower 317 and the second cam follower 327 accurately contact the cam member 390 regardless of the posture of the cam member 390.

  As can be understood with reference to FIGS. 10 and 11, when the motor 330 is driven to rotate, the first swing arm 312 swings back and forth around the swing center 311 within a predetermined angle range. The first portion 410 (large diameter portion 412) held by the cylindrical portion 314 at the tip of the first swing arm 312 is reciprocated within a predetermined length range, and the welding wire W in the torch main body portion 230 is The pull back and the feed are alternately repeated. Further, the second swing arm 322 is always reciprocally swung in the direction opposite to the swing direction of the first swing arm 312. In this embodiment, the cam member 390 has two vertices. As a result, when the output shaft 331 of the motor 330 rotates once, the first swing arm 312 swings back and forth twice, and the welding wire W moves back and forth twice (retraction operation and delivery operation twice each). I do. For example, if the rotation number of the motor 330 is kept constant at about 6,000 rpm, the frequency of operation of the welding wire W is about 200 Hz.

  Next, the operation of the welding apparatus 100 and the reciprocating drive mechanism 300B according to the above-described embodiment will be described.

  During the welding operation, the first portion 410 (large diameter portion 412) of the wire guide 400 held by the cylindrical portion 314 at the tip of the first swing arm 312 is reciprocated in the axial direction by the reciprocating drive mechanism 300B. The welding wire W can be reciprocated at high speed along the axial direction at the tip of the welding torch 200 (near the wire lead-out portion 240). Since the motor 330 is used while being rotated in only one direction, for example, the welding motor W of the wire feeding device 111 can be fed and pulled back at a high speed without switching the forward rotation or the reverse rotation of the driving motor. Can be repeated. This is suitable for avoiding a short-circuit phenomenon occurring between the tip of the welding wire W and the base material during welding, and is preferable for improving the welding quality.

  In the present embodiment, as described above, the cam member 390 has two vertices located on opposite sides of the axis Ox, and when the output shaft 331 of the motor 330 rotates once, the welding wire W is reciprocated twice. Perform the action. According to such a configuration, the welding wire W can be reciprocated at a higher speed.

  Since the second portion 420 of the wire guide 400 has flexibility, the curved state of the wire guide 400 changes within a predetermined range while the wire guide 400 remains curved due to the reciprocation of the first portion 410 in the axial direction. As a result, the welding wire W guided by the wire guide 400 is prevented from being deformed and can be smoothly moved relative to the wire guide 400 while changing the path length in the torch body 230. As a result, the welding wire W can be fed smoothly.

  The reciprocating drive mechanism 300B includes a second swing arm 322 (second motion body 320) that can be reciprocated in the opposite direction to the reciprocation of the first swing arm 312 (first motion body 310). Yes. According to such a configuration, the inertial force generated by the reciprocating motion of the first swing arm 312 at an operating frequency of 200 Hz or more causes the second swing that moves in the opposite direction to the first swing arm 312. It is canceled out by the moving arm 322. Therefore, the occurrence of vibration due to the inertial force during the reciprocating motion of the first swing arm 312 is suppressed. Suppression of vibration during welding is preferable for improving welding quality.

  In the present embodiment, a weight 325 is provided on the second swing arm 322. As a result, it is possible to balance the weight with the wire guide 400 held by the first swing arm 312 and reciprocally moved, and the generation of vibrations can be efficiently suppressed.

  The cam member 390 is engaged with a first cam follower 317 provided at an intermediate portion of the first swing arm 312. According to such a configuration, when the first swing arm 312 swings back and forth, the displacement amount of the cylindrical portion 314 at the tip of the first swing arm 312 is approximately twice the displacement amount of the intermediate portion. Therefore, it is suitable for increasing the stroke of the reciprocating motion in the axial direction of the first portion 410 (wire guide 400) held by the cylindrical portion 314 at the tip of the first swing arm 312.

  The second swing arm 322 (cylindrical portion 324) holds the first portion 410 (wire guide 400) so as to be slidable in the axial direction thereof. According to such a configuration, since the first part 410 to be reciprocated is guided by the second swing arm 322 and keeps substantially the same posture, it is possible to suppress the generation of inappropriate vibration.

  FIG. 12 shows a modification of the reciprocating drive mechanism according to the third embodiment of the present invention. The reciprocating drive mechanism 300B ′ shown in the figure is the same as the reciprocating drive mechanism 300B described above in that a cam mechanism is employed, but the configuration relating to the engagement of the cam member 390 and the first and second cam followers 317 and 327. Is different from the reciprocating drive mechanism 300B described above.

  In the reciprocating drive mechanism 300B ', the cam member 390 has an annular engagement groove 392 formed around the axis Ox. The engagement groove 392 has an elliptical shape. The first swing arm 312 and the second swing arm 322 are provided with support pieces 318 and 328 extending from the intermediate portion toward the axis Ox. A first cam follower 317 and a second cam follower 327 are attached to the tips of the support pieces 318 and 328, and the first and second cam followers 317 and 327 are fitted in the engaging grooves 392. In the present embodiment, the engagement groove 392 corresponds to an engagement portion with the first cam follower 317 and the second cam follower 327, and in the engagement portion, two pieces located on the opposite sides with the axis Ox interposed therebetween. Has a vertex. Note that the reciprocating drive mechanism 300B 'does not include the tension coil spring 391 of the reciprocating drive mechanism 300B shown in FIG.

  Although detailed illustration is omitted, in the configuration of the reciprocating drive mechanism 300B ′ shown in FIG. 12, when the motor 330 is driven to rotate, the first swing arm 312 and the second swing arm 322 are opposite to each other. Swing back and forth in the direction. Further, since the cam member 390 has two apexes, the welding wire W performs two reciprocations when the output shaft 331 of the motor 330 makes one rotation. According to the reciprocating drive mechanism 300B ', the same effects as those of the reciprocating drive mechanism 300B described above with reference to FIGS.

  13 and 14 show a reciprocating drive mechanism according to the fourth embodiment of the present invention. The reciprocating drive mechanism 300C of this embodiment has a wire guide 500 (additional wire guide) held at the tip of the second swing arm 322, and is greatly different from the reciprocating drive mechanism 300B described above in this respect. Various changes have been made accordingly. Note that the reciprocating drive mechanism 300C does not include the weight 325 of the reciprocating drive mechanism 300B shown in FIG.

  The wire guide 500 has substantially the same configuration as the wire guide 400, and includes a first portion 510 that is rigid and extends linearly, and a second portion 520 that is flexible. In the present embodiment, the first portion 410 has a dimension from one end (large diameter portion 412) held by the first swing arm 312 to the opening at the other end compared to the case of the reciprocating drive mechanism 300B. Small. The first portion 510 of the wire guide 500 has the same configuration as the first portion 410 of the wire guide 400, and the opening end of the first portion 510 faces the opening end of the first portion 410. Opposing end portions of the first portions 410 and 510 are inserted into a guide pipe 221 provided in the housing portion 220. A series of welding wires W are inserted through the wire guide 400 and the wire guide 500, respectively.

  The structure for holding the first portion 510 by the tip of the second swing arm 322 is the same as the structure for holding the first portion 410 by the first swing arm 312. That is, the cylindrical portion 326 at the tip of the second swing arm 322 can rotate the large diameter portion 512 at one end of the first portion 510 around an axis parallel to the axis Ox of the output shaft 331. Is holding in.

  A storage chamber 600 for storing the second portion 520 of the wire guide 500 is connected to the wire introduction part 210. The storage chamber 600 has substantially the same shape as the torch body 231 and is arranged so as to be line-symmetric with the torch body 231 with respect to a symmetrical axis extending vertically through the axis Ox of the output shaft 331 in FIG. Has been. The storage chamber 600 forms an internal space 600 a that communicates with the storage space 220 a of the housing part 220. The internal space 600a is curved like the internal space 231a of the torch body 231, and the width along the plane P gradually increases from the proximal end to the distal end of the storage chamber 600 and gradually increases after becoming maximum. It is formed to shrink. Although not shown, the tip of the second portion 520 of the wire guide 500 is fixed to the tip of the storage chamber 600.

  When driving the reciprocating drive mechanism 300C of this embodiment, the first swing arm 312 and the second swing arm 322 swing back and forth in opposite directions as in the case of the above-described reciprocating drive mechanism 300B. FIG. 14 shows a state in which the output shaft 331 of the motor 330 is rotated 90 ° counterclockwise (in the direction of arrow N1 in the figure) from the state shown in FIG. At this time, the first portion 510 (large diameter portion 512) of the wire guide 500 held by the cylindrical portion 326 at the tip of the second swing arm 322 moves to the leftmost side. Here, since the distal end of the flexible second portion 520 is fixed to the distal end portion of the storage chamber 600, the first portion 510 moves to the left in the internal space 600a as the arrow N4 moves. As shown, it is displaced to the convex side of the curved shape.

  As understood with reference to FIGS. 13 and 14, in the present embodiment, the welding wire W guided by the two wire guides 400 and 500 has a path length in the torch main body 230 and the accommodation chamber 600. Becomes longer or shorter in synchronization. Therefore, the stroke of the reciprocating motion (pulling back and feeding) along the feeding direction of the welding wire W is about twice that of the reciprocating drive mechanism 300B, and the welding wire W is reciprocated with a larger stroke. Can do.

  In the present embodiment, wire guides 400 and 500 are respectively held at the tips (the cylindrical portion 314 and the cylindrical portion 326) of the first swing arm 312 and the second swing arm 322. The first swing arm 312 and the second swing arm 322 swing back and forth in opposite directions. According to such a configuration, there is a weight balance between the wire guide 400 held by the first swing arm 312 and reciprocated, and the wire guide 500 held by the second swing arm 322 and reciprocated. This is an optimal state, and vibrations during driving can be more efficiently suppressed.

  Although the embodiments of the present invention have been described above, 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 the claims are all within the scope of the present invention. Is included.

  In the above embodiment, the crank member and the cam member act on the intermediate portion of the first and second swing arms, but the present invention is not limited to this. A configuration may be adopted in which a crank member or a cam member acts on the tip portions of the first and second swing arms. Moreover, although the case where it comprised by the 1st and 2nd rocking | fluctuating arm as a 1st and 2nd moving body was demonstrated, this invention is not limited to this. The first and second moving bodies may have any configuration as long as they are configured to reciprocate in opposite directions.

  In the above embodiment, in the configuration in which the driving force of the motor 330 is transmitted using the cam member 390 (cam mechanism), the shape of the cam member can be variously changed. As in the above embodiment, when the engagement portion of the cam member with the first and second cam followers is elliptical, the reciprocating operation in which the welding wire repeats pulling back and feeding in the feeding direction when the reciprocating drive mechanism is driven. The wire velocity diagram representing the relationship between the passage of time and the velocity has a sine waveform as shown in FIG. On the other hand, by devising the shape of the engaging part of the cam member, for example, as shown in FIG. 15B, it is possible to vary the duty ratio and speed ratio between the feed direction and the return direction. Therefore, it becomes possible to easily control the feeding speed of the welding wire suitable for various welding conditions.

  In the above embodiment, the case where the welding torch is provided with the welding wire reciprocating drive mechanism has been described, but the present invention is not limited to this. The reciprocating drive mechanism for the welding wire according to the present invention may be provided at any location on the welding wire feeding path.

DESCRIPTION OF SYMBOLS 100 Welding device 110 Manipulator 111 Wire feeding device 112 Wrist part 120 Wire reel 130 Conduit cable 140 Single wire type power cable 150 Gas cylinder 170 Teach pendant 180 Robot controller 190 Welding power supply device 200 Welding torch 210 Wire introduction part 220 Housing part 220a accommodation Space 230 Torch body portion 230a Intermediate portion 230b Inlet portion 231 Torch body 231a Internal space 232 Tip body 233 Feed tip 240 Wire lead-out portion 300, 300A, 300B, 300B ′, 300C Reciprocating drive mechanism 310 First moving body 311 Swing center 312 First swing arm 313 Pin 314 Cylindrical portion 317 First cam follower 318 Support piece 320 Second moving body 321 Swing center 322 Second swing arm 3 3 pin 324 cylindrical part 325 weight 326 cylindrical part 327 second cam follower 328 support piece 330 motor 331 output shaft 340 first crank member 341 one end side cylinder part 342 other end side cylinder part 350 second crank member 351 one end side cylinder Portion 352 other end side cylinder portion 360 connecting member 361 first eccentric shaft portion 362 second eccentric shaft portion 370 bearing 371 inner ring 372 outer ring 380 bearing 381 inner ring 382 outer ring 390 cam member 391 tension coil spring (elastic body)
392 Engagement groove 400 Wire guide 410 First portion 411 Entrance portion 412 Large diameter portion 420 Second portion 421 Tip 500 Wire guide (additional wire guide)
510 1st part 512 Large diameter part 520 2nd part 600 Storage chamber (additional storage chamber)
600a Internal space Ox Axis (center of output shaft)
O1 First eccentric position O2 Second eccentric position P Plane W Welding wire

Claims (10)

A welding wire to be fed toward the welding torch is inserted, and at least a part of the wire guide has flexibility, and a storage chamber for storing the wire guide in a curved state while fixing one end thereof,
A welding wire reciprocating drive mechanism that changes the bending state by reciprocating the other end of the wire guide in its axial direction, and imparts a reciprocating motion in the feeding direction to the welding wire,
A first moving body capable of reciprocating while holding the other end of the wire guide;
A welding wire reciprocating drive mechanism comprising: a second moving body that is reciprocated in a direction opposite to the reciprocating motion of the first moving body. The first moving body is a first swing arm that is swingably supported at one end and holds the other end of the wire guide at the other end,
The second moving body is a second swing arm that is swingably supported at one end,
2. The welding wire reciprocating drive mechanism according to claim 1, wherein the first swing arm and the second swing arm are swung in directions opposite to each other by a swing mechanism driven by a motor. .   The welding wire reciprocating drive mechanism according to claim 2, wherein the second swing arm holds the wire guide so as to be slidable in an axial direction thereof.   The welding wire reciprocating drive mechanism according to claim 2, wherein the second swing arm has a mass adjusting means.   5. The welding wire reciprocating drive mechanism according to claim 4, wherein the mass adjusting means is a weight formed on the second swing arm.   The swing mechanism is connected to a connecting member integral with the output shaft of the motor so that one end of the swing mechanism is rotatable about a position displaced from the center of the output shaft. A first crank member whose other end is pivotally connected to the portion, and a position displaced from the center of the output shaft to the opposite side of the one end of the first crank member with respect to the connecting member. And a second crank member, one end of which is pivotably connected and the other end of the second swing arm is pivotally connected to an intermediate portion of the second swing arm. A reciprocating drive mechanism for a welding wire according to any one of the above.   The swing mechanism includes a cam member integral with the output shaft of the motor, a first cam follower formed on the first swing arm and engaged with the cam member, and the second swing arm. And a second cam follower that engages with the cam member on the opposite side across the center of the output shaft. A reciprocating drive mechanism for a welding wire according to claim 1. An additional wire guide through which the welding wire is inserted and at least a portion of which is flexible; and an additional storage chamber for storing the additional wire guide in a curved state while fixing one end thereof,
The reciprocating drive mechanism of the welding wire according to claim 1 or 2, wherein the other end of the additional wire guide is held by the second moving body and faces the other end of the wire guide.   The reciprocating drive mechanism of the welding wire according to any one of claims 1 to 8, which is provided in the welding torch.   A welding apparatus comprising the welding wire reciprocating drive mechanism according to claim 1, wherein the welding wire is fed to the welding torch via the welding wire reciprocating drive mechanism.

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