JPH0723068Y2 - Work transfer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a work transfer device used for a tandem automatic press or the like and used for loading or unloading a work.

[Conventional technology]

In the tandem automatic press, a work transfer device is provided to transfer a work press-formed by one press die to the next process.

As shown in FIG. 8, the conveyed work is first sucked and pinched and lifted at the take-out position A, then horizontally moved to the put-in position, and then lowered at the put-in position B to grasp the work. It will be released and placed. After that, the operation is repeated in the reverse order and the same operation is repeated.

Japanese Utility Model Publication No. 61-82735, which is publicly known before the application of the present invention,
A work transfer device 30 as shown in FIG. 7 is disclosed.

This work transfer device 30 is a press lower die inside a press machine 51.
The molded work W placed on 52 is adsorbed by the vacuum cup 38, lifted and horizontally moved, lowered at the front end portion of the transfer conveyor 53, adsorbed and released, and placed on the transfer conveyor 53.

The vacuum cup 38 has jaws 37, pins 32, 34, 35, 3
6, the arm 33 is attached to the slide member 39 through a four-point link mechanism.

The rotation of the rotation shaft 43 attached to the support member 40 causes the slide member 39 to slide on the machine base 31, and the vacuum cup
38 moves up and down, and the vacuum cup 38 moves forward and backward via the crank arm 42 and the four-point link mechanism.

The work W transferred to the rear end of the transfer conveyor 53 is placed in the press die of the next process by using the same work transfer device 30.

Prior to the filing of this application, in the transfer of a work by a work transfer device sandwiching a transfer conveyor, as disclosed in the known Japanese Utility Model Publication No. 61-82735, the work transfer device without the transfer conveyor shown at the beginning. The following problems also occurred in the simple work transfer.

[Problems to be solved by the device]

The problem occurs, as shown in FIG. 5, so that the work transfer device 30 approaches the upper mold 21 and the lower mold 22 in order to carry out the molded work W on the lower mold 22, When moving forward,
The other is that, as shown in FIG. 6, the work transfer device 30 holding the work W is used as a press die for the next process.
It is time to descend after being placed on the lower mold 22 'to place the.

What is shown in FIG. 5 will be described in detail. A work W press-molded by the upper mold 21 and the lower mold 22 is placed on the upper surface of the lower mold 22. In order to hold the work W and carry it out, the jaw 1 of the work transfer device 30 moves horizontally, and the upper die 21 and the lower die 22 are moved.
Approaching. At this time, the upper mold 21 may not have risen to the top dead center.

In this case, the tip portion of the jaw 1 of the work transfer device 30 cannot properly enter the space between the upper die 21 and the lower die 22, and the tip portion of the jaw 1 collides with the upper die 21 to cause the jaw 1 to contact the jaw 1. There was a problem that the overload was applied and the jaw 1 was damaged.

Next, the one shown in FIG. 6 will be described in detail. Work transfer device 30 that holds the press-formed work W in the previous step
However, the work W is placed in the lower die 22 'of the upper die 21' which is the press die of the next step and placed on the lower die 22 '.

However, the work W that was previously molded due to a mistake in removal, etc.
May remain on the lower die 22 '. In this case, the work W held by the jaw 1 of the work transfer device 30 interferes with the work W just placed,
An upward force acts on Joe 1. As a result, there is a problem in that the jaw 1 is overloaded and the jaw 1 is damaged.

In order to prevent the bending damage of the jaw 1, it is conceivable to incorporate a mechanism for stopping the work conveying device 30 into the work conveying device 30 when the jaw 1 is overloaded.

However, since the work transfer device 30 is moving at a very high speed, even if the jaw 1 is overloaded and the stop mechanism operates, the jaw 1 cannot immediately stop due to its inertial force. . As a result, the jaw 1 is overloaded as in the conventional case, and the bending loss of the jaw 1 still occurs, which is not an essential solution to the problem.

As another solution, a method of mechanically synchronizing the transfer operation of the work transfer device 30 and the vertical movement of the upper dies 21 and 21 'of the press die can be considered. In other words, the jaws 1 of the work transfer device 30 move the upper molds 21, 21 'and the lower molds 22, 22' between the time when the upper molds 21, 21 'reach the top dead center and start to move downward.
It is mechanically set so as to enter the space between them.

However, the device for synchronizing the transfer operation of the work transfer device 30 and the vertical movement of the press die becomes complicated, and the synchronization device fails in a heavy transfer operation.

Furthermore, in the current era of high-mix low-volume production, it is necessary to adapt to new press products by changing the transporting device and press die.

In such a case, when the movement of the work transfer device, which is the second means for solving the problems, and the vertical movement of the press die are synchronized, the press die and the work transfer device are integrated, and It cannot be replaced independently.
As a result, it goes against the generalization of the equipment required in the era of high-mix low-volume production.

Therefore, an object of the present invention is to prevent the bending of the jaw by absorbing the overload when the jaw is overloaded when the jaw is advanced or lowered.

[Means for Solving the Problems]

The work transfer device according to the present invention which meets this technical problem is
Between the upper and lower dies of the pressing device, for taking out the molded work and transferring it to the next step, a work holding means for holding the work, and a jaw to which the work holding means is attached. A jaw holding means to which the jaw is attached and a drive mechanism for driving the jaw holding means, the jaw holding means being composed of three members of an upper member, an intermediate member and a lower member, and the upper member,
The intermediate member is connected to the drive mechanism, the intermediate member is slidably provided with the upper member, the lower member is pivotally supported by the intermediate member so as to be rotatable, and the insertion port is provided. The jaw is inserted into the insertion opening and attached so as to be movable backward.

[Operation] In such a work transfer device, in order to take out the work after molding between the upper die and the lower die of the pressing device,
The work holding means approaches the work after molding.

This work holding means is attached to the jaw,
Further, the jaw is connected to the drive mechanism through the jaw holding means, and the work holding means is moved by the driving of the drive mechanism.

The work holding means may interfere with the upper mold while approaching the work. In this case, the work holding means receives a force in the backward direction due to the collision with the upper mold, but since the jaw is inserted into the insertion port, it moves in the backward direction.

The jaw holding means is composed of an upper member, an intermediate member, and a lower member.
Since the intermediate member is slidably provided on the upper member, the intermediate member is further slid and retracted when the jaw is retracted and the retracted distance is insufficient.

The work holding means holding the work approaches the press die of the next step, and places the work at the loading position. When attempting to place this, there is a case where the work in the previous step remains on the lower die due to a mistake in taking out. In this case, when the work held by the work holding means remains, it interferes with the work holding means when it descends, and an upward force acts, but the lower member to which the work holding means is attached is the intermediate member. Since it is pivotally supported and rotatably provided, it moves upward.

〔Example〕

A preferred embodiment of a work transfer device according to the present invention will be described below with reference to the drawings.

1 to 4 show an embodiment of the present invention.

As shown in FIG. 1, the jaw 1 is bent in a step shape, and a work holding means 19 using a cylinder as a drive source is attached to the tip end portion thereof.

The jaw holding means 20 is composed of three parts, an upper member 3, an intermediate member 6 and a lower member 2, and the intermediate member 6 is the upper member 3.
The lower member 2 is slidably attached to the lower member 2 via the rotary shaft 4. More specifically, as shown in FIG. 2 which is a sectional view taken along the line AA in FIG. 1, the intermediate member 6 is inserted into an intermediate member insertion groove 18 provided on the lower surface of the upper member 3 and having a claw-shaped cross section facing inward. Has been done.

A jaw insertion port 5 is horizontally provided in the lower member 2, and the jaw 1 is inserted therein. The base of Joe 1 is
It is in contact with the jaw receiver 10 at the rear portion thereof, and the jaw receiver 10 is biased toward the jaw 1 side by the spring 13.

A recess 24 is provided in a part of the outer peripheral portion of the portion into which the jaw 1 is inserted, and the locking key 23 incorporated in the lower member 2 is provided.
Then, the recessed portion 24 is caught, so that the biasing force of the spring 13 is stopped.

A detection rod 11 extends on the spring 13 side of the jaw receiver 10, and an engaging claw 12 is attached to the tip of the detection rod 11. The engagement claw 12 is engageable with a limit switch 14 provided on the rear side of the lower member 2. Further, the intermediate member 6 includes a lower member support 7 having a U-shaped cross section.
Is attached so as to sandwich the lower member 2 from below, and a spring 8 is provided in the space sandwiched between the lower member support 7 and the lower member 2 to urge the lower member 2 upward.

Furthermore, the above-mentioned upper end portion of the jaw receiver 10 is inclined, and the stopper pusher 15 having an inclined surface slidable with this inclined surface at the lower end portion is slidable above the retracted position of the jaw receiver 10. It is movably installed. That is,
The stopper pusher 15 has a flange portion (not shown) on both sides, and the sectional shape viewed from the jaw insertion port 5 side is T-shaped. A hole for inserting the stopper pusher 15 having a T-shaped cross section is provided in the upper surface portion of the lower member 2, and at the upper end not sliding with the jaw receiver 10, the stopper pusher 15 has its own weight.
It has entered the hole.

Further, the lower member 2 has a clockwise direction in FIG.
A lower member rotation stopper 9 is provided on the upper surface of the rear end portion so as not to rotate. The lower member rotation stopper 9 is engaged with a recess provided on the lower surface of the rear end of the upper member 3.

A recess is provided on the lower surface of the upper member 3 at a position where it abuts the stopper pusher 15 provided on the lower member 2, and an intermediate member lock 16 biased downward by a spring 17 is provided in the recess. Has been interpolated.

The upper surface of the intermediate member 6 is the lock for the intermediate member described above.
Abutting against 16, the movement in the backward direction is restricted.

The upper member 3 is connected at its upper end to a drive mechanism (not shown) so as to move in the up-down and front-rear directions.

Next, the operation of the work transfer device configured as described above will be described.

The work sandwiched by the work holding means 19 is carried between the upper die and the lower die to be placed on the lower die. At that time, there is a case where the previously molded work remains on the upper surface of the lower mold due to some removal error.

In such a case, when the work holding means 19 descends, it interferes with the remaining work and an upward force acts on the tip portion of the jaw 1.

However, since the intermediate member 6 and the lower member 2 are rotatable via the rotary shaft 4, the lower member 2 together with the jaw 1 is resisted against the biasing force of the spring 8. As shown, it rotates counterclockwise. As a result, Joe 1
The loss of music can be prevented.

Another case in which the jaw 1 is bent and damaged, that is, the case of interference with the press die will be described. The press-molded work in the upper mold and the lower mold is placed on the lower mold. In this case, first, the jaw 1 of the transfer device enters between the upper die and the lower die and horizontally moves to directly above the press-formed product.

At this time, the horizontal movement of the jaw 1 is so fast that the upper die and the lower die may not enter properly, and the upper die and the jaw 1 may collide.

In this case, a force is applied to the jaw 1 in the backward direction. However, since the jaw 1 is inserted into the jaw insertion opening of the lower member 2, is urged by the spring 13 through the jaw receiver 10, the jaw 1 receives the force in the backward direction, Retreat against the bias.

As a result, even if a force is applied in the backward direction, the jaw 1 is retracted according to the force, so that the bending loss of the jaw 1 can be prevented. Further, at this time, the engaging claw 12 attached to the tip of the rod 11 extending in the rearward direction of the jaw receiver 10 is the limit switch.
By deviating from 14, the operation of the transport device is stopped, and the jaw 1 is prevented from being damaged.

In some cases, the backward movement of the jaw 1 is insufficient to prevent the jaw 1 from being damaged due to a short movement distance.

At this time, the jaw holder 10 that contacts the rear end of the jaw 1
Pushes up the stopper pusher 15 to move the intermediate member lock 16 upward, and the intermediate member 6 is unlocked.

As a result, as shown in FIG. 4, depending on the force in the backward direction,
The intermediate member 6 is retracted, the lower member rotation stopper 9 is released from the upper member 3, and the lower member 2 is rotated about the rotation shaft 4, whereby the jaw 1 is rotated downward and is damaged. Can be avoided.

In this embodiment, the work holding means 19 is held by a cylinder mechanism, but it may be a vacuum cup for suction or the like.

[Effect of device]

As described above, when the jaws collide with the press die as described above, when the jaws receive a force in the backward direction, the jaws are inserted into the insertion opening and retracted, and the backward distance is reduced. In the case of a large size, the intermediate member slides back with respect to the upper mold member, and further the lower member rotates via the rotary shaft, so that the bending damage of the jaw can be prevented.

When the work is conveyed to the next process and interferes with the work that was not taken out due to a picking error when descending, the lower member rotates through the rotating shaft, causing the jaws to escape upward, and bending damage It can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic side view of a jaw holding means of a work transfer device according to the present invention, and FIG. 2 is a schematic view of FIG.
FIG. 3 is a cross-sectional view taken along the line AA, and FIGS. 3 and 4 are schematic side views showing the operation of the jaw holding means of the work transfer device according to the present invention. FIGS. 5 and 6 are conventional work transfer devices. FIG. 7 is a schematic side view showing an operation state of the apparatus, FIG. 7 is a side view of a conventional work transfer apparatus, and FIG. 8 is a work input / removal trajectory of a general work transfer unit. 1 ... Jaw 2 ... Lower member 3 ... Upper member 4 ... Rotary shaft 5 ... Insertion port 6 ... Intermediate member 19 ... Work holding means 20 ... Jaw holding means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References: 62-127333 (JP, U): 61-82735 (JP, U): 53-42914 (JP, B2): 57- 14974 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A work transfer device for taking out a molded work between an upper die and a lower die of a pressing device, and carrying it to the next step and carrying it in, which is a work holding means for holding the work. A jaw to which the work holding means is attached, a jaw holding means to which the jaw is attached, and a drive mechanism for driving the jaw holding means, wherein the jaw holding means includes an upper member and an intermediate member. , The lower member, and the upper member,
An intermediate member is connected to the drive mechanism, an intermediate member is provided slidably with the upper member, a lower member is pivotally supported by the intermediate member, and is provided with an insertion opening. A work transfer device, wherein the jaw is inserted into the insertion opening and attached so as to be capable of moving backward.