JP2020025972A - Weld nut feeder and resistance-welding device - Google Patents

Abstract

To provide a weld nut feeder which can reliably feed plural weld nuts one by one to a one-side electrode of a resistance-welding device, and the resistance-welding device.SOLUTION: The weld nut feeder performs opening/closing control of a clamper 110 which clamps a weld nut 501, which exists in a base member 133, through first and second through grooves 136, 137 formed on the base member 133 on which a nut storage body 1021 is installed, and opening/closing control of a separator 120 which supports the weld nut 501, which is positioned just before the weld nut 501 clamped by the clamper 110, through third and fourth through grooves 138, 139 formed at a lower position that exceeds a thickness of one weld nut and is less than a thickness of two weld nuts than that of the first and second through grooves 136, 137, and discharges the plural weld nuts 501 stored in the nut storage body 1021 one by one. The feeder receives the discharged weld nuts 501 by a nut transport part 103, and feeds the same to a one-side electrode 85 of a resistance-welding device 1.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a welding nut supply device that supplies a welding nut to a resistance welding device that enables welding of a welding nut to a steel plate or the like, and a resistance welding device including the welding nut supply device.

  In recent years, unlike a stationary or table type resistance welding device, welding is not performed by sandwiching a work such as a steel plate between two separate electrodes. In contrast, so-called one-sided welding in which welding is performed by pressing from one direction (mainly upward) has come to be seen frequently (for example, see Patent Documents 1 and 2).

  FIG. 13 is a side view showing a welding gun 70 of the resistance welding apparatus described in Patent Document 2, FIGS. 14 and 15 are side views showing a tip portion of the welding gun 70 of the resistance welding apparatus, and FIG. 3A and 3B show a joint portion of a workpiece (hereinafter, referred to as a “workpiece”) 500 to be welded by the resistance welding apparatus, wherein FIG. 3A is a plan view and a side view, and FIG. As shown in FIG. 13 and FIG. 14, the one-sided electrode 85 is energized with the gun body 71 supporting the same, so as to cover the inner electrode 85A in which the insulating ring 85C is provided at the tip and the outer periphery of the inner electrode 85A. And an inner electrode 85A and an outer electrode 85B arranged coaxially. The outer electrode 85B is integrated with the sliding conductor 72, and can be moved in the axial direction by the sliding conductor 72 (that is, it can move toward the work 500). Between the gun body 71 and the sliding conductor 72, a linear motion guide 73 for connecting these components and guiding the sliding conductor 72 to the gun body 71 is provided. The gun main body 71 and the sliding conductor 72 constitute a welding gun 70.

  The work 500 is an assembled plate formed by laminating two steel plates 500a and 500b, and a steel plate 500a above the welded portion (hereinafter, referred to as an "upper steel plate") 500a is provided as shown in FIG. A relief hole 550 is formed. As shown in FIGS. 14 and 15, inside the escape hole 550 (FIG. 16A) formed in the upper steel plate 500a, the tip of the inner electrode 85A has a lower steel plate (hereinafter, referred to as a "lower steel plate"). Then, the outer electrode 85B presses the opening peripheral portion of the escape hole 550 (FIG. 16A) of the steel plate 500a of the work 500. As shown in FIG. 16A, a plurality of (three in the figure) projections 551 are formed at the joint portion of the work 500.

  Power is supplied between the outer electrode 85B and the inner electrode 85A in a state where the inner electrode 85A presses the lower steel plate 500b and the outer electrode 85B presses the upper steel plate 500a. As a result, current flows through the path of the outer electrode 85B → the projection 551 of the upper steel plate 500a → the lower steel plate 500b → the inner electrode 85A, and the upper steel plate 500a and the lower steel plate 500b of the work 500 are welded.

  Incidentally, some of the one-sided electrodes have a structure in which a welding nut is welded to a steel plate in addition to a structure in which the two steel plates 500a and 500b are welded to each other as described above. For example, Patent Literature 3 discloses a resistance welding apparatus for welding a pin (screw) -shaped or nut-shaped work to a steel plate. The resistance welding apparatus described in Patent Literature 3 is provided with a work supply mechanism that automatically supplies a work to one electrode.

  As a work supply mechanism similar to that of the resistance welding apparatus described in Patent Document 3, there is a component supply control device described in Patent Document 4, for example.

JP 2011-031269 A JP-A-2017-035707 JP 2004-298880 A JP 2008-007326 A

  However, the resistance welding apparatus described in Patent Literature 3 includes a work supply mechanism that supplies a pin (screw) -shaped or nut-shaped work to one electrode at a time one by one. It is unknown whether the work is being sent out, and no description of the mechanism is found. When supplying a workpiece to one side electrode, it is necessary to send out the workpieces one by one, and therefore, a mechanism capable of reliably sending out the workpieces is required.

  The component supply control device described in Patent Literature 4 applies air to a plurality of components (nut-shaped workpieces) housed in a tubular passage member one by one from an oblique direction, and applies air to the fixed electrode. Is provided with a mechanism for sending out onto a sheet metal part arranged in the above, but does not supply a part to one side electrode.

  The present invention has been made in view of the above circumstances, and provides a welding nut supply device and a resistance welding device capable of reliably supplying a plurality of welding nuts one by one to one electrode of the resistance welding device. The purpose is to:

  A welding nut supply device of the present invention supplies a welding nut to a resistance welding device having a single-sided electrode including an inner electrode and an outer electrode that accommodates the inner electrode and is disposed coaxially with the inner electrode. A welding nut supply device, wherein an inner diameter is slightly larger than an outer diameter of the welding nut, and a cylindrical welding nut container having a length capable of accommodating a plurality of the welding nuts, and a diameter of the welding nut. A circular rod-shaped body that is less than the diameter of the screw hole and has a total length substantially equal to the total length of the welding nut container, and is inserted into the welding nut container while holding a plurality of the welding nuts through the screw holes; A substantially cylindrical shape into which a lower end of the welding nut container can be inserted, and a step for locking a lower end of the welding nut container at a predetermined position therein, and the welding nut container is Step Below the locked position, there are first and second through grooves penetrating all the way to the inside at an axially symmetric position perpendicular to the axis and at the same level as the first and second through grooves. The third and fourth internal through-grooves are located below the first and second through-grooves in a shape and size that exceed the thickness of one welding nut and less than the thickness of two welding nuts. A clamp having a base member, an opening and closing mechanism for opening and closing the two clamp pieces, sandwiching the welding nut present inside the base member through the first and second through grooves of the base member, and two separators; A separator having an opening and closing mechanism for opening and closing the piece, supporting the welding nut positioned immediately before the welding nut sandwiched by the clamper through the third and fourth through grooves of the base member; and Switchgear , A second drive unit for operating the clamper opening / closing mechanism, and a welding nut receiving portion for receiving the welding nut, wherein the welding nut receiving portion is provided for the welding nut container. A welding nut transport unit that reciprocates between immediately below and directly below the welding gun of the resistance welding apparatus, and a control unit that controls the welding nut transport unit while controlling the first and second driving units. The control unit controls the first and second driving units so that the operations of (1) to (5) can be repeatedly performed, and (1) sets the separator in a closed state and the clamper in an open state. (2) gripping the welding nut immediately above the welding nut supported by the separator with the clamper closed, (3) the welding nut currently supported with the separator opened. Discharge, ( 4) The separator is closed, (5) the clamper is opened, and the control unit controls the welding nut conveyance unit to discharge the welding nut from the welding nut container by the operation of (3). The welded nut is transported to the one-sided electrode of the resistance welding device.

  According to the above configuration, a plurality of welding nuts can be reliably supplied one by one to one electrode of the resistance welding apparatus.

  In the above configuration, each of the two clamp pieces of the clamper has a shape such that a side that contacts the welding nut contacts at least two of the six vertexes of the welding nut.

  According to the above configuration, it is possible to reliably hold the side surface of the welding nut.

  In the above configuration, a disk-shaped body having a size larger than the outer diameter of the welding nut and having through holes penetrating through the upper and lower surfaces formed at regular intervals along the circumferential direction, and a rotating mechanism for rotating the disk-shaped body And a plurality of sets of welding nut supply means including the welding nut container, the circular rod-shaped body, the base member, the clamper, and the separator. One set of the plurality of sets of welding nuts is provided for each of the plurality of through holes, and the control unit controls the rotating mechanism to rotate the disc-shaped body, and When the first through-hole among the plurality of through-holes formed in the shape body is located immediately above the welding-nut receiving portion of the welding-nut transporting portion, the welding nut disposed with respect to the through-hole. Supply means When the supply of the welding nut from the welding nut supply means is completed, the rotation mechanism is controlled to rotate the disc-shaped body, and the next through-hole is formed. When positioned just above the welding nut receiving portion of the welding nut conveying portion, the welding nut supply means disposed for the through hole is controlled to supply the welding nut, and thereafter, a set of the welding nuts is similarly provided. Each time the supply of the welding nut from the welding nut supply means is completed, the disk-shaped body is rotated to supply the welding nut from the next set of the welding nut supply means.

  According to the above configuration, the number of times of supplying the welding nut can be reduced, and the workability can be improved.

  The resistance welding apparatus according to the present invention is a resistance welding apparatus including a welding gun having a one-sided electrode structure, and includes the welding nut supply device.

  According to the above configuration, the welding nut can be continuously supplied to the work, and the working efficiency related to welding can be improved.

  According to the present invention, a plurality of welding nuts can be reliably supplied one by one to one electrode of a resistance welding apparatus.

The side view showing the appearance of the resistance welding device provided with the welding nut supply device concerning one embodiment of the present invention. The side view which shows the external appearance of the welding gun of the resistance welding apparatus of FIG. 1A and 1B show the appearance of a welding nut supply device of the resistance welding device of FIG. 1, wherein FIG. FIG. 3 is a plan view showing a circular plate-like body of the welding nut supply device of FIG. 3 and four discharge mechanisms arranged on the circular plate-like body. FIG. 3 is a plan view showing a clamper, a separator, and a cylinder constituting a discharge mechanism of the welding nut supply device of FIG. 3. 3A and 3B show clamp pieces of a clamper constituting a discharge mechanism of the welding nut supply device of FIG. 3, wherein FIG. 3A is a plan view and FIG. 3A and 3B show separator pieces of a separator constituting a discharge mechanism of the welding nut supply device of FIG. 3, wherein FIG. 3A is a plan view and FIG. The side view which shows the arrangement state of the clamper and separator which comprise the discharge mechanism part of the welding nut supply apparatus of FIG. FIG. 3 is a diagram schematically showing a state in which a discharge mechanism portion of the welding nut supply device of FIG. 3 is at a welding nut supply position and passes a welding nut accommodated in a welding nut container to a welding nut conveying unit. FIG. 2 is a block diagram illustrating a schematic configuration of a portion related to the conveyance of the welding nut in the resistance welding apparatus according to the embodiment. The figure which shows the process of discharging a welding nut from the welding nut container of the welding nut supply apparatus of FIG. Longitudinal sectional view showing one side electrode of the resistance welding apparatus of FIG. Side view showing a welding gun of the resistance welding apparatus described in Patent Document 2 The side view which shows the front-end | tip part of the welding gun of the resistance welding apparatus of FIG. The side view which shows the front-end | tip part of the welding gun of the resistance welding apparatus of FIG. 13 (a) is a plan view and a side view, and FIG. 13 (b) is a cross-sectional view of a projection forming part.

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

  FIG. 1 is a side view showing the appearance of a resistance welding apparatus 1 according to one embodiment of the present invention. In the figure, a resistance welding apparatus 1 according to the present embodiment includes a housing 2, a control / power supply unit 3, a cooling unit 4, a welding gun 5, a gun vertical movement mechanism 6, a gun rotation mechanism 7, , A table 8, a table moving mechanism 9, and a welding nut supply device 10. As shown in the figure, the casing 2 has a substantially U-shape when viewed from the side, a gun vertical movement mechanism 6 is disposed in the center of the upper inside, and a welding gun 5 is disposed near the upper opening. And a gun turning mechanism 7. The control / power supply unit 3 converts three-phase AC power supplied from a power receiving facility (not shown) into DC, and further converts the converted DC into high-frequency AC and outputs it. Further, the control / power supply unit 3 controls the welding gun 5, the gun vertical movement mechanism 6, the gun turning mechanism 7, the table movement mechanism 9, and the welding nut supply device 10, respectively. The cooling unit 4 supplies cooling water for mainly cooling the heat generated by the welding gun 5. The cooling unit 4 always operates while the power is turned on, and circulates cooling water with the welding gun 5.

  The welding gun 5 corresponds to the one-sided electrode 85 (see FIG. 2) for handling the welding nut, and has a suction structure for sucking the welding nut at the tip of the one-sided electrode. A vacuum pump (not shown) is mounted on the housing 2. The vacuum pump operates under the control of the control / power supply unit 3 when the welding nut is sucked at the tip of one electrode. The gun up / down moving mechanism 6 operates under the control of the control / power supply unit 3 and moves the welding gun 5 up and down in the vertical direction of the housing 2 by the driving force of the motor 6A. The gun turning mechanism 7 operates under the control of the control / power supply unit 3 to rotate the welding gun 5 in a direction (horizontal direction) perpendicular to the upright direction of the housing 2. The gun turning mechanism 7 rotates the welding gun 5 by rotating the belt 7B hung on the second bearing support plate 87 by using the power of the motor 7A. The table 8 places the work 500 thereon. The table moving mechanism 9 operates under the control of the control / power supply unit 3 to move the table 8 in the XY axis directions. That is, the control / power supply unit 3 controls the table moving mechanism 9 so that the welding point comes directly below the one-sided electrode 12 when welding the welding nut to the welding point of the work 500.

  Next, the welding gun 5 will be described in detail. FIG. 2 is a side view showing a detailed configuration of the welding gun 5. In FIG. 1, the welding gun 5 includes a gun body 20, a sliding conductor 21, a fixed shaft 22, a first power supply device 23, and a second power supply device 24. The fixed shaft portion 22 supports the gun body 20 and the sliding conductor 21 so as to be rotatable in the horizontal direction. The first power supply device 23 is disposed between the fixed shaft 22 and the gun body 20. The second power supply device 24 is provided between the fixed shaft portion 22 and the sliding conductor 21. The gun body 20 has a U-shape in which both the distal end portion 20A and the proximal end portion 20B are bent at right angles in the same direction, and the distal end portion 20A is provided with an inner electrode 85A of the one-sided electrode 85.

  The sliding conductor 21 is disposed adjacent to the first surface 20C on the side where both end portions 20A and 20B of the gun body 20 are bent at a right angle and the second surface 20D on the opposite side. It is slidable along the longitudinal direction (vertical direction in the figure) of the surface 20D. The sliding conductor 21 has a substantially L-shape in which the distal end portion 21A is bent at a right angle in the same direction as the distal end portion 20A of the gun body 20 and reaches the distal end portion 20A of the gun body 20. An outer electrode 85 </ b> B of the one-sided electrode 85 is provided on the tip portion 21 </ b> A of the sliding conductor 21. As described above, the one-sided electrode 85 includes the inner electrode 85A and the outer electrode 85B, and is disposed between the distal end portion 20A of the gun body 20 of the welding gun 5 and the distal end portion 21A of the sliding conductor 21.

  The inner electrode 85A of the one-sided electrode 85 is formed in a columnar shape which is electrically connected to the gun body 20 and has an insulating ring 85C provided at the tip. The outer electrode 85B of the one-sided electrode 85 is electrically connected to the sliding conductor 21 and has a cylindrical shape large enough to insert the inner electrode 85A. The inner electrode 85A and the outer electrode 85B are disposed coaxially so that the inner electrode 85A is located inside. A linear motion guide 50 is provided between the gun body 20 and the sliding conductor 21 so as to slidably connect them. The linear guide 50 includes a rail 50A and two connecting pieces 50B slidable on the rail 50A. The rail 50A is provided on the sliding conductor 21 side, and the connecting piece 50B is provided on the gun body 20 side. Will be arranged. An insulating material is provided at a portion of the connection piece 50B that contacts the rail 50A, and the rail 50A and the connection piece 50B are in a non-conductive state.

  The fixed shaft portion 22 includes a first fixed shaft 29 and a second fixed shaft 32. The fixed main body 20 and the sliding conductor 21 are rotated about a central axis common to the first fixed shaft 29 and the second fixed shaft 32. And rotatably supported. The first fixed shaft 29 is formed of a columnar conductive metal member, one end of which is directly connected to the minus electrode 28 of the welding transformer 27, and the other end of which extends to the first power supply device 23. The second fixed shaft 32 is made of a cylindrical conductive metal member, can be inserted into the first fixed shaft 29 while maintaining a non-conductive state with the first fixed shaft 29, and is connected to one end of the first fixed shaft 29. On the opening end side located on the same side, there is an annular flange 32A extending in a direction perpendicular to the direction of the central axis Ax (see FIG. 1). Connected. The annular flange 32A of the second fixed shaft 32 is not directly connected to the positive electrode 31 of the welding transformer 27 but is connected via a spacer 40. Here, the reason why the spacer 40 is provided will be described below.

  The end of the first fixed shaft 29 on the side of the welding transformer 27 has a structure that is bent in a direction perpendicular to the central axis direction of the first fixed shaft 29 (this portion is called an “extended portion 29A”). A gap is created between the annular flange 32A of the second fixed shaft 32 and the positive electrode 31 of the welding transformer 27 by the thickness of the extension 29A. For this reason, a space is created between the annular flange portion 32A of the second fixed shaft 32 and the positive electrode 31 of the welding transformer 27, and the spacer 40 is provided to fill the space. Of course, the spacer 40 is made of a conductive metal member such as copper. The second fixed shaft 32 and the positive electrode 31 of the welding transformer 27 are connected via the spacer 40.

  The first power supply device 23 energizes the first fixed shaft 29 and the gun body 20, and the second power supply device 24 energizes the second fixed shaft 32 and the sliding conductor 21. The first power supply device 23 and the gun body 20 are connected by a jumper wire 82 made of metal. On the upper surface side of the second power supply device 24, a second bearing support plate 87 that is in a non-conductive state with the second power supply device 24 and the sliding conductor 21 is provided. Between the second bearing support plate 87 and the first bearing support plate 743 of the fixed shaft portion 22, a plurality of (only two are shown in the figure, but there are actually two or more) bearings 88 are disposed. The movable parts (that is, the gun body 20, the sliding conductor 21, the first power supply device 23, the second power supply device 24, the linear motion guide 50, the one-sided electrode 85, and the second bearing support plate 87 are formed by these bearings 88). ) Can be rotated in the horizontal direction.

  An insulating material (not shown) is provided between the first power supply device 23 and the second power supply device 24, and the first power supply device 23 and the second power supply device 24 are in a non-conductive state. A cylinder 86 is provided between the first power supply device 23 and the gun body 20 to urge the gun body 20 downward by receiving a supply of compressed air. The cylinder 86 prevents the gun body 20 from being pushed back by the pressurization when the inner electrode 85A supported by the gun body 20 is pressed against the work 500 (see FIG. 1) (ie, the gun body 20). This is to apply a downward force to the gun body 20 so that the gun body 20 does not recede. A piston (not shown) built in the cylinder 86 moves according to the amount of compressed air supplied to the cylinder 86. This piston is indirectly connected to the gun body 20. The energization of the first fixed shaft 29 and the gun body 20 is performed through a jumper wire 82 connecting the first power supply device 23 and the gun body 20.

  Returning to FIG. 1, the table 9 has a substantially square flat plate shape, and a work 500 is placed thereon. The work 500 is, for example, a plate set formed by stacking at least two steel plates. In addition, the work 500 includes a work in which a protective sheet is stuck on the back surface (for example, the back surface farther from one electrode of the two stacked steel plates), and a work in which a paint is applied.

  The welding nut supply device 10 operates under the control of the control / power supply unit 3 and supplies a welding nut to the one-sided electrode 85 of the welding gun 5. 3A and 3B are views showing the appearance of the welding nut supply device 10, wherein FIG. 3A is a plan view, and FIG. 3B is a side view of FIG. 3A as viewed from the direction of arrow Y1. In FIG. 1, a welding nut supply device 10 extends from the rear part of the housing 2 of the resistance welding device 1 (the part on which the control / power supply unit 3 and the cooling unit 4 are disposed) to the vicinity of the welding gun 5. A substantially L-shaped arm portion 101 having a length and a distal end portion of the arm portion 101 (an end closer to the welding gun 5 is used as a distal end) to discharge a plurality of welding nuts one by one. A welding nut discharging unit 102 and a welding nut conveying unit 103 that receives the welding nut discharged from the welding nut discharging unit 102 and conveys the welding nut to the one-sided electrode 85 of the welding gun 5 are provided.

  The arm unit 101 arranges the welding nut discharging unit 102 and the welding nut conveying unit 103 near the welding gun 5. The welding nut discharging unit 102 rotates the plurality of welding nut containers 1021, the disk-shaped members 1022 for arranging the respective welding nut containers 1021 at regular intervals along the circumferential direction, and rotating the disk-shaped members 1022. A rotating mechanism 1026 having a belt 1023, a pulley 1024, and a motor 1033 for discharging the workpiece, and a discharging mechanism 1027 for discharging a plurality of welding nuts contained in each welding nut container 1021 one by one (see FIG. 4). And cylinders 111 and 121 (see FIG. 5) for operating the discharge mechanism 1027.

  The welding nut supply device 10 of the present embodiment has four discharging mechanism units 1027 so as to be able to handle four welding nut containers 1021. Note that the number of discharge mechanism units 1027 is not limited to four, but may be three or less, or may be five or more. The welding nuts discharged from each discharging mechanism 1027 are transported to the welding gun 5 by the welding nut transporting unit 103. The welding nut used in the present embodiment is a hexagon nut. Some hex nuts used in resistance welding have projections on one surface.

  The welding nut discharging portion 102 will be described in detail. FIG. 4 is a plan view showing the disc-shaped body 1022 and four discharge mechanism units 1027 arranged on the disc-shaped body 1022. As shown in the figure, the four discharge mechanisms 1027 are arranged at 90-degree intervals along the circumferential direction on the surface of the disk-shaped body 1022. In addition, a tooth pattern is formed on the outer peripheral surface of the disc-shaped body 1022 so as to fit into the unevenness formed on the inner surface of the belt 1023 described above.

  5A and 5B are views showing a clamper 110, a separator 120, a cylinder 111 for operating the clamper 110, and a cylinder 121 for operating the separator 120, which constitute the discharge mechanism 1027. FIG. 5A shows the clamper 110 and the operation of the clamper 110. The cylinders 111 and (b) to be operated are the separators 120 and the cylinders 121 for operating the separators 120.

  As the cylinders 111 and 121, any of an electric type, a pneumatic type and a hydraulic type can be adopted, but in the present embodiment, a pneumatic type is used. The cylinders 111 and 121 are stacked and arranged at a position separated from the disk-shaped body 1022 on which the four discharge mechanism units 1027 are arranged (that is, a supply position of the welding nut 501). As will be described later, the clamper 110 and the separator 120 are arranged such that the clamper 110 is disposed on the upper side and the separator 120 is disposed on the lower side. Are arranged as follows. It is possible to provide the cylinders 111 and 121 on the disk-shaped body 1022 in correspondence with the respective discharge mechanism units 1027, but the cost is increased because four cylinders 111 and 121 are required. In addition, since the disk-shaped body 1022 rotates, it is necessary to perform processing so that a resin pipe for supplying air to the cylinders 111 and 121 is not entangled. These problems can be solved by separating the cylinders 111 and 121 from the disk-shaped body 1022.

  The clamper 110 includes two clamp pieces 112 and 113 and two springs 114 and 115. FIGS. 6A and 6B show the clamp pieces 112 of the clamper 110 constituting the discharge mechanism unit 1027. FIG. 6A is a plan view, and FIG. 6B is a side view including a partial cross section. In the drawing, the clamp piece 112 has a clamp piece upper part 112a, a clamp piece lower part 112b, and a step part 112c for providing a step between the clamp piece upper part 112a and the clamp piece lower part 112b. The clamp piece upper portion 112a has a concave curved side surface 112d that comes into contact with the side surface of the welding nut 501, and penetrates both surfaces of the clamp piece 112 at a position adjacent to the curved side surface 112d in a direction opposite to the curved direction of the curved side surface 112d. It has a first through hole 112e.

  The curved side surface 112d of the clamp piece 112 has a shape and a size capable of contacting at least two vertexes of the six vertexes of the welding nut (hex nut) 501 used in the resistance welding apparatus 1. The clamp piece lower portion 112b has a projecting side surface 112f below the curved side surface 112d and projecting in the same direction as the curved direction of the curved side surface 112d, and a second portion penetrating both sides of the clamp piece 112 at a position adjacent to the projecting side surface 112f. It has a through hole 112g.

  As shown in FIG. 5A, one end of a spring 114 is engaged with the first through hole 112e of the clamp piece 112. The spring 114 urges the upper portion 112 a of the clamp piece 112 in the direction of the arrow Y <b> 2, and is hooked on the hook 126 at a position where the other end exceeds the length of the spring 114. The second through hole 112g (see FIG. 6) of the clamp piece 112 is inserted into the fixed shaft portion 116 (see FIG. 5).

  On the other hand, the clamp piece 113 has a symmetrical shape with the clamp piece 112. One end of the spring 115 is engaged with the first through hole 113e (see FIG. 5) of the clamp piece 113. The spring 115 urges the upper portion 113a of the clamp piece in the direction of the arrow Y3, and the other end is hooked on the hook 127 at a position beyond the length of the spring 115. A second through hole 113 g (not shown) of the clamp piece 113 is inserted into the fixed shaft 116. The clamp piece 112 and the clamp piece 113 are arranged so as to face each other, and are rotatably supported by the fixed shaft portion 116. The clamp piece 112 and the clamp piece 113 are normally opened by the contraction force of the springs 114 and 115.

  It is to be noted that the steps between the upper clamp portion 112a and the lower clamp portion 112b of the clamp portion 112 and the upper clamp portion 113a and the lower clamp portion 113b of the clamp portion 113 have steps. This is because the lower portion 112b and the lower portion 113b of the clamp 113 do not come into contact with each other so that the clamp 112 and the clamp 113 can be opened and closed.

  The clamp pieces 112 and 113 maintain the normally open state as described above, but are closed by the operation of the cylinder 111, and this state continues until the cylinder 111 stops. That is, when the cylinder 111 is operated, the clamp piece lower part 112b of the clamp piece 112 and the clamp piece lower part 113b of the clamp piece 113 are pushed upward (in the direction of arrow Y4), whereby the clamp pieces 112, 113 are fixed to the fixed shaft part 116. And the clamp pieces 112 and 113 are closed. Here, if the welding nut 501 exists between the clamp piece upper part 112a of the clamp piece 112 and the clamp piece upper part 113a of the clamp piece 113, the weld nut 501 is gripped by the clamp pieces 112 and 113. Like the curved side surface 112d of the clamp piece 112, the shape and size of the curved side surface (not shown) of the clamp piece 113 are at least two of the six vertexes of the welding nut (hex nut) used in the resistance welding device 1. It can contact two vertices. By setting each of the curved side surface 112d of the clamp piece 112 and the curved side surface (not shown) of the clamp piece 113 to such a shape and size, the side surface of the welding nut 501 can be securely gripped.

  In FIG. 5B, the separator 120 includes two separator pieces 122 and 123 and two springs 124 and 125. FIGS. 7A and 7B show a separator piece 122 of the separator 120 constituting the discharge mechanism unit 1027, wherein FIG. 7A is a plan view and FIG. 7B is a side view. In the figure, the separator piece 122 has a separator piece upper part 122a, a separator piece lower part 122b, and a step part 122c for providing a step between the separator piece upper part 122a and the separator piece lower part 122b. Separator piece upper portion 122a has a flat plate shape to receive welding nut 501. The separator piece lower part 122b is located below the separator piece upper part 122a, has a first through hole 122d penetrating both sides of the separator piece 122, and has a first part penetrating both sides of the separator piece 122 to connect one end of the spring 124. It has two through holes 122e.

  As shown in FIG. 5B, one end of a spring 124 is engaged with the second through hole 122e of the separator piece 122. The other end of the spring 124 is hooked on the hook 126 at a position exceeding the length of the spring 124. By fixing the other end of the spring 124 at a position exceeding the length of the spring 124, the portion of the separator piece 122 where the second through hole 122e is formed is pulled by the spring 124 in the direction of arrow Y5. The first through-hole 122 d of the separator piece 122 is inserted into the fixed shaft part 116.

  On the other hand, the separator piece 123 has a symmetrical shape with the separator piece 122. One end of a spring 125 is engaged with the second through hole 123e of the separator piece 123. The other end of the spring 125 is hooked on the hook 127 at a position exceeding the length of the spring 125. The first through hole 123 d of the separator piece 123 is inserted into the fixed shaft part 116. The separator piece 122 and the separator piece 123 are arranged so as to face each other, and are rotatably supported by the fixed shaft portion 116. The separator piece 122 and the separator piece 123 are normally closed by the contraction force of the springs 124 and 125.

  It is to be noted that the steps provided between the separator piece upper portion 122a and the separator piece lower portion 122b of the separator piece 122 and between the separator piece upper portion 123a and the separator piece lower portion 123b of the separator piece 123 are as follows. This is because the separator piece 122 and the separator piece 123 can be opened and closed by preventing the lower part 122b of the separator piece 123 from contacting the lower part 123b of the separator piece 123.

  Although the separator pieces 122 and 123 are normally closed as described above, when the cylinder 121 is operated, the separator piece lower part 122b of the separator piece 122 and the separator piece lower part 123b of the separator piece 123 are positioned on the upper side (arrow). (Y7 direction), the separator pieces 122 and 123 rotate outward around the fixed shaft portion 116, and are opened. At this time, if the welding nut 501 falls between the separator piece upper part 122a of the separator piece 122 and the separator piece upper part 123a of the separator piece 123, it will be received.

  The clamper 110 and the separator 120 are stacked and arranged at a thickness of about 1.5 welding nuts 501 such that the clamper 110 is on the upper side and the separator 120 is on the lower side. FIG. 8 is a side view showing an arrangement state of the clamper 110 and the separator 120 constituting the discharge mechanism unit 1027. 5, the clamper 110 is viewed from the direction of arrow Y4 shown in FIG. 5, and the separator 120 is viewed from the direction of arrow Y7 shown in FIG. The clamper 110 and the separator 120 are arranged on the disk-shaped body 1022. The clamper 110 and the separator 120 open and close around a common fixed shaft portion 116. As described above, the clamper 110 and the separator 120 constitute a discharge mechanism unit 1027, and there are three other discharge mechanism units 1027 having the same configuration.

  The disc-shaped body 1022 is provided with a light shielding member 130 for detecting the discharge mechanism unit 1027 for each discharge mechanism unit 1027. The light shielding member 130 has a plate shape in which both end portions are bent 90 degrees in opposite directions to each other, one end side is fixed on the disk-shaped body 1022, and the other end side is a free end. When the other end of the light blocking member 130 enters between the detection gaps of the transmission type photointerrupter 131, the discharge mechanism unit 1027 is detected. The position detected by the transmission type photo interrupter 131 is the supply position of the welding nut 501. After one of the four discharge mechanisms 1027 stops at the supply position of the welding nut 501, the cylinders 111 and 121 operate to discharge the welding nut 501 from the welding nut container 1021. Below the supply position of the welding nut 501, the welding nut transport unit 103 is on standby, and receives the discharged (dropped) welding nut 501.

  FIG. 9 is a view schematically showing a state in which the discharge mechanism unit 1027 is at the supply position of the welding nut 501 and passes the welding nut 501 stored in the welding nut container 1021 to the welding nut conveying unit 103. The welding nut container 1021 has an inner diameter slightly larger than the diagonal dimension of the welding nut 501, and has a length capable of accommodating several tens of welding nuts 501, and has a pin at a lower end in a direction perpendicular to the central axis. It has a cylindrical shape having a through hole (not shown) through which the member 134 (see FIG. 11) passes. A circular rod 1025 is inserted in the welding nut container 1021, and the welding nut 501 is stored in the welding nut container 1021 through the circular rod 1025. The circular rod 1025 has a diameter less than the diameter of the screw hole of the welding nut 501, has a length substantially equal to the total length of the welding nut container 1021, and holds several tens of welding nuts 501 through the screw holes. And is inserted into the welding nut container 1021. The circular rod 1025 is fixed at the upper end side of the welding nut container 1021, and the lower end side is a free end. In this case, the disk-shaped body 1022 side of the welding nut container 1021 is the lower end side, and the side opposite to the lower end side is the upper end side.

  When accommodating the welding nut 501 in the welding nut container 1021, the lower end side of the welding nut container 1021 is turned upward and the screw nut of the welding nut 501 is inserted into the circular rod-shaped body 1025. . When the welding nut 501 is accommodated in the welding nut container 1021, the welding nut 501 is passed through the circular rod-shaped body 1025, so that the welding nut 501 does not become oblique in the welding nut container 1021 and can be neatly inserted. After accommodating the welding nut 501 in the welding nut container 1021, a rod-shaped pin member 134 (see FIG. 11) is inserted into a through hole (not shown) formed in the lower end of the welding nut container 1021 in a radial direction. The welding nut 501 is prevented from falling. With the pin member 134 thus inserted, the welding nut container 1021 is set on the base member 133 of the discharge mechanism 1027.

  In FIG. 9, the base member 133 of the discharge mechanism unit 1027 has a substantially cylindrical shape having an inner diameter slightly larger than the diameter of the welding nut container 1021, and has a hinge 140 extending outward at a lower end opening. Further, the base member 133 has a stepped portion 135 on the inner surface side of the upper end portion, which locks the lower end of the welding nut container 1021 at a predetermined position. Further, the base member 133 is located above the step 135 and has a U-shaped groove (not shown) at the bottom. This groove is formed in the direction of the axis 700. Further, the same groove as this groove is formed at an axially symmetric position in a direction perpendicular to the axis 700. That is, the groove is formed at each of the axially symmetric positions in the direction perpendicular to the axis. These grooves support both ends of the pin member 134 inserted into the through-hole (not shown) of the welding nut container 1021.

  Further, the base member 133 has first and second through-grooves 136 and 137 penetrating to the inside of the base member 133 at an axially symmetric position in a direction perpendicular to the axis 700 below the step portion 135. are doing. The base member 133 has the same shape and size as the first and second through-grooves 136 and 137, and has a thickness of one welding nut 501 from the first and second through-grooves 136 and 137. The third and fourth through-grooves 138 and 139 are provided at lower positions exceeding the thickness of two or more. The upper and lower clamp pieces 112a and 113a of the clamper 110 enter and exit the first and second through grooves 136 and 137, and the upper and lower separator pieces 122a and 123a of the separator 129 enter the third and fourth through grooves 138 and 139. Comes in and out.

  After attaching the welding nut container 1021 to the base member 133 of the ejection mechanism 1027, the pin member 134 is pulled out. By this operation, all the welding nuts 501 housed in the welding nut housing body 1021 fall, but are received by the separator 120 because the separator 120 is in the closed state. Thereafter, when the discharge mechanism 1027 operates, the plurality of welding nuts 501 housed in the welding nut housing body 1021 are discharged one by one.

  FIG. 10 is a block diagram illustrating a schematic configuration of a portion related to the conveyance of the welding nut in the resistance welding apparatus 1 according to the present embodiment. In the figure, a control unit 300 and a driving unit 301 are included in the control / power supply unit 3. The control unit 300 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an interface, and the like. The ROM stores a program for controlling the CPU, and the RAM is a so-called work memory used in the operation of the CPU. Further, an interface configuring the control unit 300 connects the rotation mechanism unit 1026, the transmission type photo interrupter 131, the driving unit 301, and the welding nut conveying unit 103 to the CPU. The drive unit 301 injects / discharges air from / to each of the cylinders 111 and 121.

  The control unit 300 controls the driving unit 301 to operate the cylinders 111 and 121. In this case, the clamper 110 operates by the operation of the cylinder 111, and the separator 120 operates by the operation of the cylinder 121. Further, the control section 300 controls the rotation mechanism section 1026 to rotate the disk-shaped body 1022 on which the four discharge mechanism sections 1027 are arranged. Further, the control unit 300 takes in the output of the transmission type photo interrupter 131 and detects the light blocking member 130 from the change. Further, the control unit 300 controls the welding nut transport unit 103 to transport the welding nut 501 discharged from the discharging mechanism unit 1027 to the one-sided electrode 85 of the welding gun 5. Further, the control unit 300 controls the suction mechanism unit 302 to suck the welding nut 501 conveyed to the one-sided electrode 85 of the welding gun 5 in the external electrode 85 </ b> B of the one-sided electrode 85.

  The welding nut conveying section 103 is, for example, an air cylinder, and has an arm 1031 that can be extended and retracted with respect to the main body. A receiving member 1032 that receives the welding nut 501 discharged from the discharging mechanism 1027 is attached to a tip portion of the arm 1031. The receiving member 1032 has a bullet shape large enough to fit into the screw hole of the welding nut 501.

  Here, the operation of the control unit 300 until the plurality of welding nuts 501 housed in the welding nut housing body 1021 are separated one by one and conveyed to the one-sided electrode 85 of the welding gun 5 will be described.

  The control unit 300 first controls the rotation mechanism unit 1026 to rotate the disk-shaped body 1022. In addition, the control unit 300 takes in the output of the transmission type photointerrupter 131 at the same time as rotating the disk-shaped body 1022. Then, when the light shielding member 130 is detected from the change in the output of the transmission type photo interrupter 131, it is determined that the supply position of the welding nut 501 has been reached, and the rotation mechanism 1026 is controlled to stop the rotation of the disk-shaped body 1022. . After stopping the disc-shaped body 1022, the control unit 300 controls the welding nut conveying unit 103 to bring the receiving member 1032 provided at the tip end of the arm 1031 to the supply position of the welding nut 501. Next, the control unit 300 controls the air supplied to the cylinders 111 and 121 to the discharge mechanism unit 1027 that is currently at the supply position of the welding nut 501, thereby operating the clamper 110 and the separator 120, and One welding nut 501 is discharged from the container 1021.

  FIG. 11 is a diagram illustrating a process of discharging the welding nut 501 from the welding nut container 1021.

(Step 1)
As shown in (a) of the figure, a welding nut container 1021 accommodating a plurality of welding nuts 501 is mounted on a base member 133 of a discharge mechanism unit 1027.

(Step 2)
As shown in FIG. 13B, the pin member 134 is pulled out of the welding nut container 1021. At this time, although the clamper 110 is in the open state, the separator 120 is in the closed state, so that the lowermost welding nut 501 falls to the separator 120, and the other welding nuts 501 subsequently fall. .

(Step 3)
As shown in (c) of the figure, the clamper 110 operates to grip the welding nut 5012 at the _second from the bottom. In this case, as described above, the distance between the clamper 110 and the separator 120 is approximately 1.5 times the thickness of the welding nut 501, so that the clamper 110 is the second welding nut 501 from the bottom. ₂ is gripped.

(Step 4)
As shown in (d) of the figure, with the clamper 110 continuously operating, the separator 120 is operated to be in an open state. Thus, support for the weld nut 501 ₁ at the bottom is opened, the weld nut 501 ₁ is discharged (i.e., falls).

(Step 5)
As shown in FIG. 7E, the separator 120 stops, and the clamper 110 also stops. When the separator 120 stops, the separator 120 is closed, and when the clamper 110 stops, the separator 120 is open, which is the same as the above (Step 2).
Each time the above (Step 2) to (Step 5) are repeated, the welding nut 501 is separated one by one.

  One welding nut 501 discharged from the welding nut container 1021 is received by the receiving member 1032 of the arm 1031 of the welding nut transport unit 103. After the welding nut 501 is received by the welding nut transport unit 103, the control unit 300 controls the welding nut transport unit 103 to extend the arm 1031 and transport the arm 1031 to the one-sided electrode 85 of the welding gun 5.

  The control unit 300 controls the conveyance of one welding nut 501 to the one-sided electrode 85, and then controls the gun vertical movement mechanism unit 6 to lower the welding gun 5 to the receiving member 1032 of the welding nut conveyance unit 103. The welding nut 501 is accommodated in the outer electrode 85B of the one-sided electrode 85. After accommodating the welding nut 501 in the outer electrode 85B of the one-sided electrode 85, the control unit 300 operates the suction mechanism 302 to make the space accommodating the welding nut 501 in the outer electrode 85B a negative pressure, and 501 is adsorbed. The suction mechanism 302 has suction means (not shown) such as a vacuum pump.

  Here, the structure of the one-sided electrode 85 will be described. FIG. 12 is a longitudinal sectional view showing the one-sided electrode 85. As shown in the drawing, an air passage 85D is formed inside the one-sided electrode 85, and the welding nut 501 is attracted by setting the air passage 85D to a negative pressure.

  After sucking the welding nut 501, the control unit 300 controls the gun vertical movement mechanism unit 6 to raise the welding gun 5. Next, the table moving mechanism 9 is controlled to bring a welding position of a steel plate to be welded to the welding nut 501 directly below the welding gun 5. When the welding position of the steel plate comes directly below the welding gun 5, the control unit 300 lowers the gun vertical movement mechanism unit 6 and welds the welding nut 501 to the welding position.

  When all of the welding nuts 501 housed in one welding nut housing body 1021 are discharged, the control unit 300 controls the rotation mechanism unit 1026 to rotate the disk-shaped body 1022 to store the next welding nut housing body. It switches to the body 1021 and supplies the welding nut 501 from the new welding nut container 1021. In switching of the welding nut container 1021, it is necessary to detect that the welding nut container 1021 before switching is empty. The determination as to whether or not the welding nut container 1021 is empty is made by, for example, preparing a light emitting element (not shown) and a light receiving element, and detecting the welding nut 501 falling by these elements. A method may be considered in which it is determined that an empty space has been reached when detection cannot be performed for more than a predetermined time from the time. Incidentally, the arrangement of the light emitting element and the light receiving element is on both sides of the falling path in a direction perpendicular to the falling path of the welding nut 501 (it is not necessary to be completely perpendicular).

  Further, as another method, by detecting that both the lowermost welding nut 501 and the subsequent welding nut 501 in the welding nut container 1021 are no longer present, the welding nut container 1021 becomes empty. There is also a method of judging that it has become. In this case, the presence of the welding nut 501 can be detected by disposing the light emitting element on one side and the light receiving element on the other side with the welding nut 501 interposed therebetween.

  Note that the cylinder 121 corresponds to a first drive unit, and the cylinder 111 corresponds to a second drive unit. Further, at least the welding nut container 1021, the circular rod 1025, the base member 133, the clamper 110, and the separator 120 constitute a welding nut supply unit.

  As described above, according to the welding nut supply device 10 according to the present embodiment, the welding nut container 1021 capable of accommodating the plurality of welding nuts 501 and the screw hole of the welding nut 501 inserted into the welding nut container 1021. And a circular rod-shaped body 1025 inserted into the welding nut container 1021 while holding the plurality of welding nuts 501, and the welding nut container 1021 can be inserted, and reaches the inside at an axially symmetric position perpendicular to the axis. The first and second through-grooves 136 and 137 have the same shape and size as the first and second through-grooves 136 and 137. A base member 133 having third and fourth internal through-grooves 138 and 139 at lower positions exceeding the thickness of one welding nut and less than the thickness of two welding nuts; A clamper 110 having an opening and closing mechanism for opening and closing the pieces 112 and 113, and sandwiching a welding nut 501 existing inside the base member 133 through the first and second through grooves 136 and 137 of the base member 133, and two separator pieces A separator 120 having an opening and closing mechanism for opening and closing 122 and 123, and supporting the welding nut 501 positioned immediately before the welding nut 501 sandwiched by the clamper 110 through the third and fourth through grooves 138 and 139 of the base member; A cylinder 121 for operating the opening and closing mechanism of the separator 120, a cylinder 111 for operating the opening and closing mechanism of the clamper 110, a control unit 300 for controlling the cylinders 111 and 121 and for controlling the welding nut conveying unit 103, and a welding nut 501. Receiving weld nut receiving portion 1032, and welding nut receiving portion 1 32 includes a welding nut conveying unit 103 that reciprocates between a position directly below the welding nut container 1021 and a position directly below the welding gun 5 of the resistance welding device 1. The control unit 300 performs the following (1) to (5). The cylinders 111 and 121 are controlled so that the operation of (1) can be repeated, (1) the separator 120 is closed and the clamper 110 is opened, and (2) the clamper 110 is closed and supported by the separator 120. The welding nut 501 immediately above the welding nut 501 is gripped, (3) the separator 120 is opened, the currently supported welding nut 501 is dropped, (4) the separator 120 is closed, and (5) the clamper 110 is closed. Is opened, and the welding nut 501 discharged from the welding nut container 1021 by the operation (3) is received by the welding nut receiving portion 103 of the welding nut conveying portion 103. Since it is captured by the part 1032 and transported to the one-sided electrode 85 of the resistance welding device 1, it is possible to reliably supply a plurality of welding nuts 501 one by one to the one-sided electrode 85 of the resistance welding device 1.

  Further, according to the welding nut supply device 10 according to the present embodiment, the two clamp pieces 112 and 113 of the clamper 110 each have at least two vertexes of the six vertexes of the welding nut 501 on the side in contact with the welding nut 501. Therefore, the side surface of the welding nut 501 can be reliably gripped.

  Also, according to the welding nut supply device 10 according to the present embodiment, since there are a plurality of sets of welding nut supply means including the welding nut container 1021, the circular rod 1025, the base member 133, the clamper 110, and the separator 120, Therefore, the number of times of supplying the welding nut 501 can be reduced, and the workability can be improved.

  In addition, according to the welding nut supply device 10 according to the present embodiment, the welding nut 501 is continuously supplied to the work 500 by applying to the resistance welding device 1 including the welding gun 5 having the one-sided electrode structure. The working efficiency related to welding can be improved.

  Although the present invention has been described with reference to particular embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.

  The present invention has an effect that a plurality of welding nuts can be supplied one by one to one electrode of a resistance welding device, and can be applied to a resistance welding device provided with one electrode.

DESCRIPTION OF SYMBOLS 1 Resistance welding apparatus 2 Housing of resistance welding apparatus 3 Control / power supply unit 4 Cooling unit 5 Welding gun 6 Gun vertical movement mechanism part 7 Gun turning mechanism part 8 Table 9 Table movement mechanism part 10 Welding nut supply device 20 Gun main body 21 Slide Moving conductor 22 Fixed shaft part 23 First power supply device 24 Second power supply device 27 Welding transformer 85 One-sided electrode 85A Inner electrode 85B Outer electrode 85C Insulation ring 85D Air path 101 Arm part 102 Welded nut discharge part 103 Welded nut transfer part 110 Clamper 111, 121 Cylinder 112, 113 Clamp piece 112a, 113a Clamp piece upper part 112b, 113b Clamp piece lower part 112c, 122c Stepped portion 112d Curved side surface 112e, 113e First through hole 112f Projected side surface 112g Second through hole 114, 115 Ring 116 Fixed shaft part 120 Separator 122, 123 Separator piece 122a, 123a Separator piece upper part 122b, 123b Separator piece lower part 122d, 123d First through hole 122e, 123e Second through hole 124, 125 Spring 126, 127 Hanging part 130 Light shielding Member 131 Transmission type photointerrupter 133 Base member 134 Pin member 135 Stepped portion 136, 137 First, second through groove 138, 139 Third, fourth through groove 140 Hinge 300 Control unit 301 Drive unit 302 Suction mechanism unit 500 Work 501 Welding nut 700 Shaft center 1021 Welding nut container 1022 Disk-shaped body 1023 Belt 1024 Pulley 1025 Circular rod 1026 Rotation mechanism 1027 Ejection mechanism 1031 Arm 1032 Receiver Wood 1033 motor

Claims (4)

An inner electrode, a welding nut supply device that receives the inner electrode, and supplies a welding nut to a resistance welding device having a one-sided electrode composed of an outer electrode coaxially arranged with the inner electrode,
An inner diameter is slightly larger than an outer diameter of the welding nut, and a cylindrical welding nut container having a length capable of accommodating a plurality of the welding nuts,
The diameter is less than the diameter of the screw hole of the welding nut, the total length is substantially the same as the total length of the welding nut container, and each of the plurality of welding nuts is held in the welding nut container while being held through the screw hole. A circular rod interpolated,
The welding nut container has a substantially cylindrical shape into which the lower end portion can be inserted, and has a step inside for locking the lower end tip of the welding nut container at a predetermined position, and the welding nut container has the step. Below the locked position, there are first and second through grooves penetrating all the way to the inside at an axially symmetric position perpendicular to the axis and at the same level as the first and second through grooves. The third and fourth internal through-grooves are located below the first and second through-grooves in a shape and size that exceed the thickness of one welding nut and less than the thickness of two welding nuts. A base member,
A clamper having an opening / closing mechanism for opening and closing the two clamp pieces, and sandwiching the welding nut present inside the base member through the first and second through grooves of the base member;
A separator having an opening and closing mechanism for opening and closing two separator pieces, and supporting the welding nut positioned immediately before the welding nut sandwiched by the clamper through the third and fourth through grooves of the base member,
A first drive unit for operating the separator opening and closing mechanism;
A second drive section for operating the opening and closing mechanism of the clamper;
A welding nut receiving portion having the welding nut receiving portion for receiving the welding nut, the welding nut receiving portion having a reciprocating motion between directly below the welding nut container and directly below the welding gun of the resistance welding device;
A control unit that controls the first and second drive units and controls the welding nut conveyance unit,
The control unit controls the first and second driving units so that the operations of (1) to (5) can be repeatedly obtained,
(1) closing the separator and opening the clamper;
(2) gripping the welding nut immediately above the welding nut supported by the separator with the clamper closed;
(3) opening the separator to discharge the currently supported welding nut;
(4) closing the separator;
(5) opening the clamper;
Further, the control unit controls the welding nut transport unit to transport the welding nut discharged from the welding nut container by the operation of (3) to the one-sided electrode of the resistance welding device.
Welding nut supply device. Each of the two clamp pieces of the clamper has a shape in which the side that comes into contact with the welding nut is in contact with at least two of the six vertexes of the welding nut.
The welding nut supply device according to claim 1. A disk-shaped body having a size larger than the outer diameter of the welding nut, and through holes formed through the upper and lower surfaces formed at regular intervals along the circumferential direction,
A rotation mechanism for rotating the disc-shaped body,
With
A plurality of sets of welding nut supply means including the welding nut container, the circular rod, the base member, the clamper and the separator,
The plurality of sets of welding nut supply means are arranged one by one for each of the plurality of through holes formed in the disc-shaped body,
The control unit controls the rotating mechanism to rotate the disc-shaped body, and among the plurality of through-holes formed in the disc-shaped body, the first through-hole is used for conveying the welding nut. When positioned just above the welding nut receiving portion of the portion, the welding nut supply means disposed for the through hole is controlled to supply the welding nut, and the welding nut is supplied from the welding nut supply means. When the supply is completed, the rotating mechanism is controlled to rotate the disc-shaped body, and when the next through-hole is located immediately above the welding nut receiving portion of the welding nut transporting portion, the following through-hole is formed. The supply of the welding nut is performed by controlling the welding nut supply means arranged in the same manner, and thereafter, similarly, every time the supply of the welding nut from one set of the welding nut supply means is completed, the disc-shaped body is removed. And rotate it to the next set To supply the welding nut from serial welding nut supply means,
The welding nut supply device according to claim 1 or 2. A resistance welding apparatus provided with a welding gun having a one-sided electrode structure,
A resistance welding device comprising the welding nut supply device according to claim 1.