JPH0123211B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transfer device for conveying a workpiece in, for example, a transfer press.

The transfer press includes a plurality of idle stations and a plurality of processing stations, and one press lower mold is disposed in each processing station. Then, after supplying the workpiece to the first processing station and forming pressed semi-finished products at this processing station, the pressed semi-finished products are sequentially transferred to the front processing station or idle station, and pressed at each processing station. It is becoming more and more common to do so. The supply of workpieces and the transportation of pressed semi-finished products are carried out on the left and right 1.
It takes place in a pair of feed bars. This feed
The bar is provided with fingers corresponding to the idle station and the processing station, and performs reciprocating movements in the front and rear directions (advance, return) and approaching/separating movements (clamping, unclamping). Generally, two-dimensional motion feed bars have two types: clamp, advance, unclamp, and return.
It is configured to sequentially transport workpieces and press semi-finished products by performing dimensional movements. In this case, the feed level is above the lower mold, so when placing the workpiece in the lower mold, the workpiece must be carried above the lower mold using the feed bar and allowed to fall naturally. After pressing, for example, the pressed semi-finished product is pushed up from within the lower mold to a feed level with a knockout pin and conveyed by a feed bar. However, when the workpiece is dropped into the lower mold, there is a risk that the workpiece may bounce and not be reliably fitted into the lower mold, or may be misaligned. Although it has been considered to provide a guide to the lower die in order to prevent misalignment when the die is dropped, it is still difficult to solve the above problem when pressing is performed at high speed. Additionally, when pressing semi-finished products from the lower mold using the knock-out pin, the semi-finished products may bounce around and become unstable, making it impossible to transfer them to the feed bar smoothly. There's a problem.

In addition, as a device that can lift semi-finished pressed products from the lower die without using knock-out pins, a pair of feed bars that face each other and can be freely approached and separated are provided with Fingers are provided at intervals, and the lower proximal end of a clamping body is pivotally attached to the tips of these fingers by a horizontal shaft, and a recessed portion for clamping a workpiece is provided at the tip of each clamping body. There is known a transfer device in which an elastic body is brought into contact with the upper part of the proximal side of the clamping body so that the distal end side of the clamping body comes to a position where it is almost flush with the finger (in actual practice). (See Publication No. 54-151968). However, the purpose of this device is to prevent highly rigid workpieces or pressed semi-finished products to be subjected to warm or hot processing from touching the mold and losing heat during the forward movement of the feed bar. Since it is not intended for high-speed operation, it has the following problems. That is, since the lowering of the clamping body is controlled only by the elastic body, when this device is operated at high speed, there is a problem in that vibrations are generated due to inertia during the lowering of the clamping body.
Further, due to the above-mentioned inertia, the left and right gripping bodies are not raised evenly, so there is a risk that the posture of the workpiece or the pressed semi-finished product may be disturbed. Furthermore, when the tip of the clamping body descends, it is urged downward by the elastic body, but the feed bar starts to separate and the distance between the tips of the left and right clamping bodies becomes equal to the width of the workpiece or press semi-finished product. If it becomes larger than this, there will be nothing to support this urging force, so the workpiece or pressed semi-finished product will naturally fall. Therefore, the workpiece or pressed semi-finished product bounces on the lower mold, making it difficult to maintain its posture, and making it impossible to fit it securely into the lower mold, especially when operating at high speed. . Moreover, in the above device, the force for lifting the workpiece or pressed semi-finished product is applied by the reaction force generated when the tip of the clamping body is pressed against the workpiece by the approach of the feed bar. A pressing force sufficient to generate a reaction force strong enough to lift the body and the workpiece or press semi-finished product is required. Therefore, if the rigidity of the workpiece or pressed semi-finished product is low, the workpiece or pressed semi-finished product may be deformed during lifting.

Therefore, there is a transfer device that conveys a workpiece by making a feed bar perform a three-dimensional movement that includes clamping, unclamping, advance, return, and vertical movement (lift and down). However, since the feed bar is long and heavy, a large inertial force acts when moving it up and down, making it easy for the feed bar to bend and generate vibrations. As a result, the feed
The position of the fingers provided on the bar may become unstable, resulting in the clamping position changing or not being able to be clamped. This tendency becomes especially severe when the conveyance speed increases, and this is a fundamental problem that prevents the speeding up of transfer devices.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a transfer device that can perform reliable fitting into a lower mold and smooth and reliable transfer from the lower mold to a feed bar at high speed. With the goal.

In this specification, the term "finger" also includes a clamper. Furthermore, in this specification, "front and back" refers to the feeding direction of the pressed semi-finished product, and the side where the pressed semi-finished product is fed (the right side in Figure 1) is called the front, the opposite side is called the rear, and left and right are referred to as Let's say facing forward.

This invention will be described in detail below with reference to embodiments shown in the drawings.

In Figures 1 to 3, transfer
The press has a first station that requires a three-dimensional movement of the feed bar or finger, and a second station that allows two-dimensional movement. The transfer press is equipped with a pair of left and right feed bars 1 that move back and forth in the back and forth direction and move toward and away from each other.
A large number of fingers are attached to the bar 1 at predetermined intervals in the front-rear direction. A movable finger 2 that swings vertically about its outer end is attached to a position corresponding to the first station, and a fixed finger 3 is attached to a position corresponding to the second station. Further, the transfer press is equipped with a press bed 4, a bolster 5 is placed on the press bed 4, a die set 6 is placed on the bolster 5, and a plurality of lower molds 7 are arranged on the die set 6. .

The fixed finger 3 is fixed to the upper surface of the feed bar 1. Two first stations are arranged side by side, and two movable fingers 2 are also arranged side by side. An outwardly projecting bracket 8 is attached to the outer end of the movable finger 2. Furthermore, shaft support members 9 whose outer ends protrude outward are fixed to the feed bar 1 at both ends of the region where the movable fingers 2 are arranged. A shaft 10 is secured between the outer ends of both shaft support members 9. The shaft 10 rotatably passes through the bracket 8, so that the bracket 8 rotates around the shaft 10. Further, a hole 11 which is slightly elongated in the left-right direction is bored in a portion of the movable finger 2 above the feed bar 1. A spring mounting rod 12 is passed through the hole 11 from above, and its lower end is fixed to the feed bar 1. The length of the hole 11 in the left-right direction is slightly longer than the diameter of the spring mounting rod 12 to prevent the spring mounting rod 12 from hitting the circumferential surface of the hole 11 even when the movable finger 2 rotates upward about the shaft 10. It's getting old. Further, a spring receiver 12a is provided at the upper end of the spring mounting rod 12, and a return spring 13 is disposed between the spring receiver 12a and the upper surface of the movable finger 2, and urges the movable finger 2 downward. ing. A recess 15 is formed in the distal end surface of the movable finger 2, and an auxiliary clamping pawl 16 is inserted into the recess 15 so as to be slidable in the left-right direction. Auxiliary clamping claw 1
6 is always urged toward the tip of the movable finger 2 by a pressing spring 18 inserted into a spring fitting recess 17 connected to and provided at the back of the recess 15. On the upper side of the recess 15, the movable finger 2 has an elongated hole 19 that is long in the left-right direction and communicates the recess 15 with the outside. protrudes outward through the The elongated hole 19 and the pin 20 determine the limits when the auxiliary clamping claw 16 advances and retreats.

Further, in such a transfer device, after the feed bar 1 reaches the approach position, the push-up rod starts raising the tip of the movable finger 2 to reach the raised position, and the feed bar is moved to the forward position. The movable finger 2 is provided with a mechanism for holding the tip of the movable finger 2 in the raised position until the feed bar 1 reaches the forward position, and for starting the descent of the tip of the movable finger 2 after the feed bar 1 reaches the forward position. This mechanism consists of an interlocking rod 21 that passes through the press bed 4 so as to be able to move vertically, and a bolster 5 that is placed on the upper end surface of the interlocking rod 21 with a cushioning material 22 made of urethane rubber or the like interposed therebetween and that passes through the bolster 5 so as to be able to move up and down. , and a transmission member 23 having a horizontally long mounting portion 23a formed at its upper end, and a mounting portion 23a of the transmission member 23.
The die set 6 includes a pair of left and right movable finger push-up rods 24 which are placed on both left and right ends of the die set 6 and protrude upwardly through the die set 6 in a vertically movable manner. The lower end of the interlocking rod 21 is bifurcated.
A cam follower 25 is attached to the crotch portion so as to be rotatable in a vertical plane. cam follower 25
is brought into contact with a cam 27 fixed to a rotating shaft 26 which is long in the longitudinal direction, and the rotation of the rotating shaft 26 is converted into vertical movement of the interlocking rod 21 via the cam 27 and the cam follower 25. Rotating shaft 26
is rotated by transmitting the rotational motion of a crankshaft (not shown) of the transfer press to the rotating shaft 26 at an appropriate timing via a known motion transmission mechanism. A roller 28 that rotates in a vertical plane parallel to the front-rear direction is attached to the upper end of the push-up rod 24. The roller 28 is a contact plate 1 that is disposed astride the tips of adjacent movable fingers 2 and connects both movable fingers 2.
4, and when the feed bar 1 moves in the front-rear direction, the roller 28 rotates while contacting the abutment plate 14. The length of the contact plate 14 is longer than the conveyance pitch of the feed bar 1 in the front-rear direction. The interlocking rod 21 is moved up and down by the rotating shaft 26, and as the interlocking rod 21 moves up and down, the push-up rod 24 moves up and down via the transmission member 23. The movable finger 2 is vertically swung about the shaft 10 via the contact plate 14, and the tip of the movable finger 2 is vertically moved. The tip of the movable finger 2 is raised by a push-up rod 24 after the feed bar 1 approaches and clamps the pressed semi-finished product. When the tips are raised, the distance between the tips of the opposing movable fingers 2 becomes wider, but at this time, the auxiliary clamping claws 16 protrude due to the biasing force of the pressing spring 18, and the pressed semi-finished product P is moved by the auxiliary clamping claws 16. (See the chain line in Figure 3).

Next, the operation of each of the above components will be explained with reference to FIG.

In FIG. 4, when the crankshaft angle is 180 degrees, the feed bar 1 is at a remote position and is in the process of retreating after having conveyed the press semi-finished product P forward in the previous cycle. At this time, the slide of the transfer press is at the dead center. Further, when the push-up rod 24 is in the lowered position, the tip of the movable finger 2 is also in the lowered position. From here, the transfer press slide begins to rise. on the other hand,
The feed bar 1 continues to move backward, and before reaching the backward position, it begins to move closer (corresponding to a crankshaft angle of 205° in FIG. 4). After the feed bar 1 reaches the retreat position, it completes its approach movement, and the pressed semi-finished product P is held between the fingers 2 and 3 (see the chain line in Figure 1, which corresponds to a crankshaft angle of 285° in Figure 4). ). At the same time as the pressed semi-finished product P is clamped, the push-up rod 24 starts to rise, and the pressed semi-finished product P is lifted out of the lower mold 7 located below the movable finger 2 (the third
(See the dashed line in the figure, which corresponds to a crankshaft angle of 305° in Figure 4). After the movable finger 2 lifts the pressed semi-finished product P from inside the lower mold 7 below, the feed bar 1
starts moving forward (corresponding to the crankshaft angle of 310° in Figure 4). In the process of the feed bar 1 moving forward, the roller 28 rotates while contacting the lower surface of the contact plate 14, and the tips of the two movable fingers 2 are held at the raised position. During this time, the transfer
The slide of the press passes top dead center and begins to descend. At the same time as the feed bar 1 reaches the forward position, the push-up rod 24 begins to descend (corresponding to a crankshaft angle of 410° in FIG. 4), and the movable finger 2 also descends due to the biasing force of the return push spring 13. and,
When the tip of the movable finger 2 reaches the lowered position, the press semi-finished product P is placed in the lower mold 7 (corresponding to a crankshaft angle of 440° in FIG. 4). after that,
Feed bar 1 starts to move apart, and in the process (in Fig. 4, the crankshaft angle
(equivalent to 490°) also starts a backward movement. After the separation movement of the feed bar 1 is completed, the slide reaches the bottom dead center (corresponding to the crankshaft angle of 540° in Fig. 4).
Pressing is performed on the pressed semi-finished product P.

As described above, transfer press 1
In synchronization with the cycle operation, the press semi-finished products P are sequentially conveyed to the lower mold in the front.

In some cases, a knockout pin (not shown) may be attached to the lower mold 7 located below the movable finger 2 and the lower mold 7 located below the fixed finger 3, which moves up and down at the timing shown in FIG. The semi-finished press product may be removed from the lower mold 7 using this knock-out pin. Further, if the lower mold 7 located below the fixed finger 3 is used for drilling holes, there is no need to provide a knockout pin.

Another embodiment of the invention is shown in FIGS. 5 and 6.

In FIGS. 5 and 6, the movable finger 3
2 is disposed on the feed bar 1 so that the entire body always remains horizontal and moves up and down. That is, the lower ends of a pair of left and right guide rods 33 that pass through the movable finger 32 in a vertically movable manner are connected to the feed bar 1.
The movable finger 32 moves up and down along the guide rod 33 while keeping the whole in a horizontal state. A return spring 34 is disposed between the spring receiver 33a at the upper end of the guide rod 33 and the upper surface of the movable finger 32, and constantly biases the movable finger 32 downward. An auxiliary guide 35 is fixed to the feed bar 1 between the left and right guide rods 33 so as to straddle the movable finger 32. Auxiliary guide 35
A pair of opposing vertical walls 35a fixed to both left and right sides of the movable finger 2 and extending upward, and a horizontal wall 35b connecting the upper ends of the vertical walls 35a.
It becomes more. Further, a contact plate 36 is provided, which is in contact with the roller 38 at the upper end of the push-up rod 37, straddling the lower surfaces of both the inner and outer ends of the adjacent movable fingers 32.
are arranged, and both movable fingers 32 are connected by an abutment plate 36. The length of the contact plate 36 is longer than the conveyance pitch of the feed bar 1 in the front-rear direction. Two movable finger push-up rods 37 are arranged for each movable finger 32 below both the left and right contact plates 36. The two push-up rods 37 are designed to move up and down simultaneously at the same timing as the push-up rod 24 in the above embodiment. That is, after the feed bar 1 reaches the approach position, the push-up rod starts raising the tip of the movable finger 32 to reach the raised position, and the movable finger 32 continues until the feed bar 1 reaches the forward position. In the case where the mounting portion 39a of the transmission member 39 in the mechanism for holding the tip in the raised position and starting the descent of the tip of the movable finger 32 after the feed bar 1 reaches the forward position is in the above embodiment. even longer than
Both left and right ends are contact plates 36 on the outside of the movable finger 32
It extends to the bottom of the 4 push-up rods 37
is attached to this mounting portion 39a. When the push-up rod 37 rises, the movable finger 32 rises while maintaining its horizontal state, and its tip also rises.
Since the movable fingers 32 move up and down while maintaining a horizontal state, the distance between the distal ends of the opposing movable fingers 32 is always constant. Therefore, unlike the movable finger 2 in the above embodiment, there is no need to provide an auxiliary clamping claw on the inner surface of the tip. The rest is the same as in the above embodiment, and the feed bar 1 performs approaching/separating movements and reciprocating movements in the longitudinal direction at the same timing as in the above embodiment.

In the above embodiment, only the fingers 2 and 32 at the required positions are movable up and down, but this is because it is necessary to reliably move the pressed semi-finished product P into and out of the lower mold 7 in this part. and
If there is another part to ensure reliable loading and unloading of the pressed semi-finished product into the lower mold, the tip of the finger in that part may be made vertically movable. Furthermore, if necessary, it goes without saying that the tips of all the fingers may be made vertically movable by a mechanism similar to that described above.

According to the transfer device of the present invention, a push-up rod is disposed below the movable finger and is movable up and down and lifts the tip of the movable finger at the raised position. The push-up rod starts raising the tip of the movable finger until it reaches the raised position, and holds the tip of the movable finger in the raised position until the feed bar reaches the forward position, and the feed bar returns to the forward position. It is equipped with a mechanism that starts the lowering of the push-up rod and lowers the tip of the movable finger after reaching the tip, and is also equipped with a return spring that constantly biases the tip of the movable finger downward. It has the effect of That is, since the force for lifting the pressed semi-finished product or the workpiece is applied by the push-up rod, the force for holding the pressed semi-finished product or the workpiece may be the minimum necessary. Therefore, even if the pressed semi-finished product or the workpiece is not very rigid, it will not be deformed during lifting.

In addition, when the movable finger is raised, it is pushed up by the push-up rod and urged downward by the return spring, and its movement is controlled by the push-up rod and return spring, so that the pressed semi-finished product or workpiece is is always held in a stable position, and the position of the pressed semi-finished product or workpiece will not be disturbed even when operated at high speed. Also, when the tip of the movable finger is lowered, it is supported by the push-up rod and urged downward by the return spring.
Since its movement is controlled by the push-up rod and return spring, the pressed semi-finished product or workpiece can be
It is securely held by the fingers until it is inserted into the lower mold, and can be reliably fitted into the lower mold even when operated at high speed. Furthermore, since the vertical movement of the tip of the movable finger is controlled by the push-up rod and the return spring, this vertical movement can be set at any timing. Furthermore, the vertical movement of the tip of the movable finger is controlled by a push-up rod and a return spring, so inertia does not work when rising or falling, and the movable finger does not vibrate even when operated at high speed. . Therefore, this transfer device can operate at high speed. Furthermore, since the feed bar only moves in two dimensions, the above operations can be performed at high speed.

[Brief explanation of drawings]

1 to 4 show embodiments of this invention,
FIG. 1 is a plan view showing a part of the transfer device;
FIG. 2 is a sectional view taken along the line - in FIG. 1, FIG. 3 is an enlarged sectional view taken along the line - in FIG. 1, and FIG. 4 is a time chart. 5 and 6 show other embodiments of the present invention, FIG. 5 is a plan view showing a part of the transfer device, and FIG. 6 is an enlarged sectional view taken along the line - in FIG. 5. . 1... Feed bar, 2, 32... Movable finger, 3... Fixed finger, 13, 34... Return spring, 24, 37... Push-up rod.

Claims (1)

[Claims] 1. In a transfer device that has a pair of feed bars that reciprocate in the front-rear direction and move toward and away from each other, and to which a plurality of fingers are attached at predetermined intervals in the front-rear direction, the fingers at a desired position are It is a movable finger whose tip at least can move up and down, and a push-up rod that can move up and down and raises the tip of the movable finger in the raised position is arranged below the movable finger, so that the feed bar approaches. After reaching the position, the push-up rod starts raising the tip of the movable finger until it reaches the raised position, and holds the tip of the movable finger in the raised position until the feed bar reaches the forward position. - Equipped with a mechanism that starts the lowering of the push-up rod after the bar reaches the forward position and lowers the tip of the movable finger, and is also equipped with a return spring that constantly biases the tip of the movable finger downward. transfer equipment.