JP2679832B2 - Workpiece positioning device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a workpiece positioning device. This workpiece positioning device can be used, for example, when positioning a workpiece transferred to a processing station by a transfer arm of a transfer device on a processing line to a processing reference position.

[Prior Art] As a conventional workpiece positioning device, a machining jig is moved with respect to a work conveyed by a conveyance arm, the reference hole is inserted into the work, the work is positioned, and then the machining jig is clamped by a clamp device. There is one that holds the work fixed.

[Problems to be Solved by the Invention] After transferring a work to a fixed position corresponding to the processing jig by a transfer arm, an attempt was made to move the reference hole side of the processing jig to the work side and insert it into the outer peripheral surface of the work. In this case, since the clearance is small and there is an error in gripping the work by the transfer arm, when the work and the reference hole come into contact with each other, the transfer arm moves from the fixed position, an insertion failure occurs, and the processing machine stops. There was a problem that the utilization rate decreased.

An object of the present invention is to provide a workpiece positioning device that solves the conventional problems.

[Means for Solving the Problem] A workpiece positioning apparatus according to the present invention includes a base portion, an arm locking member that is movable relative to the base portion and locks a transfer arm that transfers a work, and the arm locking member is independent of each other. The work contact part for fixing a work movable relative to the base part, the work clamp part, and the work contact part for the work held by the transfer arm locked by the arm locking member. A first drive part held by the base part to be brought into contact with the work contact part and driven in one direction to drive the arm locking member to an arm locking position, and in the other direction, brought into contact with the work contact part. It is characterized in that it comprises a second drive part held by the base part for driving the work clamp part in the direction of clamping the work and releasing the arm locking member from the arm locking position.

[Operation of the Invention] The work is carried by the carrying arm to a fixed position near the table part and the work contact part. In this state, the second drive unit operates, and the movement in one direction drives the arm locking member to the arm locking position via the work clamp unit. As a result, the arm locking member locks a part of the transfer arm having the work attached to the tip thereof. In this state, the first drive portion operates to move the work contact portion toward the work so as to contact the work. When the work contact portion is brought into contact with the work, a pressing force is applied to the transfer arm, but the transfer arm is locked by the arm locking member and is held at a fixed position so that it does not move.

After that, the second drive unit drives the work clamp unit by the movement in the other direction, and clamps the work in contact with the work contact unit. As a result, the work is fixedly held by the work clamp portion and the work contact portion. Further, by driving the work clamp portion, the arm locking member is allowed to move in a direction away from the arm locking position and returns to the original position.

[Effect] According to the workpiece positioning apparatus of the present invention, the workpiece contact portion driven by the first drive portion is brought into contact with the workpiece that has been transported to a predetermined position by the transport arm and held by the transport device. In this case, since the transfer arm is locked by the arm locking member, it will not be displaced.

Therefore, the work contact portion and the work are smoothly brought into contact with each other, and the work can be reliably positioned at the machining reference position of the work contact portion. For this reason, it is possible to prevent the conventional work from clinging to the work holding hole of the work holding jig, to prevent the movement of the processing machine from being stopped, and to improve the operating rate of the processing machine. Further, since the arm locking part and the work clamp part are driven by the common second drive part, a plurality of external cylinder devices etc. for individually operating the arm locking member and the clamp part are not required. . Further, the drive transmission mechanism becomes simple, which is advantageous in terms of cost.

[Embodiment] An embodiment of the workpiece positioning apparatus of the present invention is shown in FIGS.
Description will be made based on the drawings.

The workpiece positioning apparatus according to the embodiment of the present invention includes a base portion 2,
It is composed of an arm locking member 2 held on the base portion 1, a workpiece contact portion 3 and a workpiece clamp portion 4, a first drive portion 5 and a second drive portion 6.

 The base 1 is held by a base (not shown).

As shown in FIG. 3, the arm locking member 2 is formed into a substantially triangular plate-shaped base portion 2a, and is formed on the center side of the plate-shaped base portion 2a so as to be swingable on the base portion 1 by a support shaft 20. A centrally projecting portion 200 that is axially supported, an arm locking claw 201 that is formed on one end side of the plate-shaped base portion 2a and locks the transfer arm 70, and a work clamp portion that is projectingly provided on the other end side of the plate-shaped base portion 2a. Transport arm 70 by 4
202 that is biased in the direction of approaching the arrow (direction of arrow S1)
With Further, the arm locking member 2 is provided with a biasing device 22 shown in FIG. This attachment device 22 abuts on the central protrusion 200 and locks the arm locking claw 201 with the transport arm 70 at a position a.
The cylinder member 220 is urged toward the position b (in the direction of arrow S2) further away from the cylinder unit 220 by a certain distance, and the arm lock slidably held in the cylinder member 220. Member 2
A pressing movement member 221 that abuts and presses the central protrusion portion 200 of
A pressing spring 222 for constantly urging the pressing moving member 221 in one direction,
The adjusting member 223 is screwed to one end of the tubular member 220 and adjusts the biasing force of the pressing spring 222.

The work contact portion 3 fixes the work 8 at the machining reference position together with the work clamp portion 4, and the work holding hole 30
A work holding base 30 having 0, a ring-shaped guide portion 302 for abutting and guiding the work 8 mounted in a floating state by the elastic body 301 in the work holding hole 300, and a part of the work holding hole 300. Attached ring-shaped fixed abutment 3
It consists of 03 and.

The work clamp portion 4 is formed of a thick plate having a shape with a substantially tapered end, and together with the work contact portion 3, the work 8
Is fixedly held in a fixed position. The work clamp claw 40 is formed on the one end side and is locked to the work 8, and the one end side of the piston shaft 61 of the second drive portion 6 which will be described later is formed on the other end side. It has a holding hole 41 to be mounted. The work clamp portion 4 is interlocked with the driving of the piston shaft 61 through the holding hole 41, and moves toward and away from the work 8 held by the transfer arm 70 in one direction (arrow Y1 direction shown in FIG. 1) and away from the work 8. Can reciprocate in the other direction (arrow Y2 direction) and has piston shaft 6
It is possible to swing in a clockwise direction (direction of arrow S3 shown in FIG. 2) and a counterclockwise direction (direction of arrow S4) around the center. The work clamp 4 is a work holding unit 701 in this embodiment.
It is composed of a pair disposed at the target position with the center as the center. Of these, the work clamp portion 4 arranged at the lower position shown in FIGS. 1 and 2 is in the direction in which the work clamp claw 40 is away from the work 8 mounted on the transfer arm 70, that is, the other direction (arrow Y2 direction). Also, when moving in the counterclockwise direction (direction of arrow S4), the engaging portion 202 of the arm engaging member 2 is engaged with the rear surface 402 so as to be interlocked, and the arm engaging claw 201 is moved to the arm engaging position a. It is like this.

The first drive unit 5 is held by a first cylinder body 50 fixed to a base 1 (not shown) and is reciprocally held by the first cylinder body 50, and one end of the first drive unit 5 is a work holding base of the work contact portion 3. The piston shaft 51 is connected to the other end side of the piston 30.

The second drive unit 6 drives the arm locking member 2 to the arm locking position a by the movement in the other direction (arrow Y2 direction), and hits the arm abutting portion 3 by the movement in one direction (arrow Y1 direction). It drives the work clamp part 4 in a direction of clamping the work 8 in contact therewith, and is held reciprocally slidably on the second cylinder body 60 formed integrally with the base part 1 and the second cylinder body 60. And a piston shaft 61. Second cylinder body 60
Is a large diameter cylinder hole 601 and a small diameter guide hole 602 which are formed in the base portion 1 and communicate with each other, and the large diameter cylinder hole 60.
It has a large diameter protrusion 604 that is attached to the open end of 1 and has a cylindrical small diameter guide protrusion 603 in the center. The piston shaft 61 has a central part 610
Is slidably held in the small diameter guide hole 602 of the second cylinder body 60, and has a large diameter piston 611 and a small diameter slide which are in slidable contact with the large diameter cylinder hole 601 and the cylindrical small diameter guide protrusion 603 at one end side, respectively. It has a moving hole 612, and has a mounting portion 613 of the work clamp portion 4 on the other end side projecting from the small diameter guide hole 602 of the second cylinder body 60. The attachment hole 41 of the work clamp portion 4 is inserted into the attachment portion 613 on the other end side of the piston shaft 61 so as to be interlocked. Also, the central portion 61 of the piston shaft 61
The 0 has a substantially S-shaped guide groove 614 capable of moving the entire piston shaft 61 in the axial direction and the circumferential direction. That is, the guide groove 614 is composed of two recessed portions 614a and 614b extending in parallel in the front-back direction of the axial direction and a recessed portion 614c connecting the two recessed portions 614a and 614b at an angle. In the guide groove 614, a guide fixing pin 61 attached to the second cylinder body 60.
5 is engaged. This causes the piston shaft 61 to rotate counterclockwise (direction of arrow S4) when moving from one direction to the other direction (direction of arrow Y2). Then, when returning from the other direction side to the one direction (arrow Y1 direction) side, it can rotate in the clockwise direction (arrow S3 direction). Along with this, the work clamp portion 4 moves in a direction away from the work 8 held by the transfer arm 70 while rotating in the counterclockwise direction (direction of arrow S4) around the mounting hole 41, It is also possible to move in the direction in which the workpiece 8 is locked while rotating in the clockwise direction (arrow S3 direction).

The operation of the workpiece positioning apparatus of this embodiment configured as described above will be described.

The work holding part 701 of the transfer arm 70 of the work transfer device 7 at the attachment station 7A position (see FIG. 5) of the processing line.
The work 8 is mounted on.

The transfer arm 70 moves forward from the mounting station 7A together with the moving base 73 that moves in the arrow Z1 direction along the passage 72 by driving the cylinder device 71. In addition, the transfer roller 74 on one end side of the transfer arm 70 is attached to the forward guide 75
It is guided along (see FIG. 4) and moves to the processing station 7B shown in FIGS. 4 and 5. After this, the second
When the drive unit 6 is driven, the piston shaft 61 moves in the other direction (arrow
While moving to the (Y2 direction) side and rotating in the counterclockwise direction (arrow S4 direction), the work clamp part 4 is interlocked in both directions and is moved away from the transfer arm 70. Then, the back surface 402 of the work clamp portion 4 engages with the engaging portion 202 of the arm locking member 2 and urges against the acting force of the urging device 220. As a result, the arm locking member 2 swings around the support shaft 20, and the arm locking claw 201 rotates clockwise (direction of arrow S1) to lock the carrier arm 70. This state is held by the second drive unit 6. Here, the first drive unit 5 is driven and the piston shaft 51 extends. Then, the workpiece contact portion 3 moves in the other direction (arrow Y2 direction) toward the workpiece 8 mounted on the transfer arm 70, and the workpiece holding hole 300 is inserted into the outer peripheral portion of the workpiece 8. Then work 8
Is abutted on the floating portion 302 and elastically guided, and then abutted on the fixed abutting portion 303 to be positioned. In this case, since the work transfer arm 70 is securely locked to the arm locking claw 201 of the arm locking member 2, the work 8
At the same time, the work contact portion 3 can be reliably brought into contact with the work 8 without moving from the fixed position. Next, when the Ai 2 drive unit 6 is driven, the piston shaft 61 moves in the one direction (the arrow Y1 direction) from the other direction side and rotates in the clockwise direction (the arrow S3 direction) to move the work clamp unit 4 in the same direction. Interlock in both directions. Then, the work clamp portion 4 abuts on the work 8, and the work abutting portion 3 fixes and holds the work piece 8. At this time, until now, the engaging portion of the arm locking member 2
The urging force by the back surface 402 of the work clamp portion 4 that abuts against the 202 and acts against the urging force of the urging device 22 is released. Along with this, the arm locking member 2 swings counterclockwise (direction of arrow S2) about the support shaft 20 by the urging force of the urging device 22. Moreover, the arm locking claw 201 moves away from the transfer arm 70. Subsequently, when the clamp drive unit 702 of the transfer arm 70 is driven, the clamping action of the not-shown holding claw that has fixedly held the work 8 until now is released.

In this state, by driving the swinging device 76 of the work transporting device 7, the transporting arm 70 at the position shown in FIG. 4 swings clockwise around the central shaft portion 70a, and the guide roller 74 causes the forward guide 75 to move. While moving to the return route guide 77,
The work holding unit 701 is separated from the work 8. After that, the work transfer arm 70 moves from the position of the processing station 7B to the position of the attachment station 7A together with the moving base 73 that moves in the arrow Z2 direction along the passage 72 by driving the cylinder device 71 shown in FIG. Will be returned. On the other hand, in the machining slursion 7B, the workpiece 8 which is securely fixed and held by the workpiece contact portion 3 and the workpiece clamping portion 4 and which is positionally clamped is processed.

As described above, in the workpiece positioning apparatus of this embodiment, when the contact portion 3 is moved to bring the workpiece holding hole 300 into contact with the workpiece 8 to perform positioning, the workpiece transfer arm 70 precedes the workpiece holding arm 2 by the arm locking member 2. Is securely locked in place by.
Therefore, according to the present embodiment, when the work contact portion 3 is brought into contact with the work 8, the work 8 is displaced from the work contact portion 3 due to the escape of the work transfer arm 70 as in the conventional case. Since the work 8 is not made,
In addition, it can be quickly positioned at a fixed position.

[Brief description of the drawings]

1 to 5 are explanatory views showing an embodiment of the workpiece positioning apparatus of the present invention. FIG. 1 is a longitudinal sectional view of the main part,
FIG. 1 is a front view of FIG. 1, FIG. 3 is an enlarged side view of the arm locking member in FIG. 1 in an enlarged state of operation, and FIG. FIG. 3 is a partial vertical cross-sectional side view showing a case where the work positioning device is attached to the work positioning device. FIG. 5 is also a front view of FIG. 1 ... Base part, 2 ... Arm locking member 3 ... Work contact part, 4 ... Work clamp part 5 ... First drive part, 50 ... Cylinder device 51 ... Piston shaft, 6 ... No. 2 Drive unit 60 …… Cylinder device, 61 …… Piston unit 70 …… Transfer arm, 8 …… Workpiece

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Ryuji Mizutani 1-1, Asahi-cho, Kariya city, Aichi Toyota Koki Co., Ltd. (56) References -63947 (JP, U) Actual public Sho 62-31240 (JP, Y2)

Claims (1)

(57) [Claims] 1. A table part, an arm locking member which is relatively movable with respect to the table part and which locks a transfer arm for carrying a work, and a work which is independent of each other and relatively movable with respect to the table part. A workpiece contact portion to be fixed, a workpiece clamp portion, and a first drive held by the base portion for bringing the workpiece contact portion into contact with the workpiece held by the transfer arm locked by the arm locking member. Part and one direction to move the arm locking member to the arm locking position, and the other direction to move the work clamping part in a direction to clamp the work contacting the work contacting part. And a second drive part held by the base part for releasing the arm locking member from the arm locking position.