JPH032341Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is a transfer line that is arranged along a press line formed by providing press positions at predetermined pitches and that sequentially transports workpieces to lower press positions. This invention relates to a crossbar expansion/contraction stroke conversion device.

Conventional technology Conventionally, a feed bar with fingers attached at predetermined pitches is arranged along a press line, and the feed bar is moved up and down and reciprocated in the length direction. , the workpiece was held and conveyed by the fingers.

Problems that the invention aims to solve According to the conventional structure as described above, when the workpiece becomes large, the center part bends due to its own weight and is not held properly, causing problems such as falling during transportation. Stable high-speed transport becomes difficult.
In addition, in order to achieve stable conveyance, it is possible to set the workpiece to be held at multiple locations by fingers, and to set the locations at the most preferable pitch, but in this case, the fingers formed between the press positions The length of the standby position (planar occupied area) must be made large enough to accommodate the multiple fingers arranged at the set pitch, which means that the entire press line becomes larger and more expensive. I was invited.

Means for Solving the Problems In order to solve the above-mentioned problems, the crossbar expansion/contraction stroke conversion device of the transfer device according to the present invention has an elevating frame disposed along the press line. A carriage is provided at one end of the frame and is movable back and forth in the longitudinal direction of the frame, and a connecting shaft that interlocks with this carriage is arranged along the elevating frame. A movable base is attached, a lever is provided on the carriage that can freely swing back and forth around the horizontal axis, a cam plate on which a cam follower attached to this lever acts is attached to the elevating frame, and the elevating frame is A push-pull shaft is disposed along the lever via an interlocking position change device, a fixing device is provided for the push-pull shaft, and the push-pull shaft and the lever can be freely disengaged from each other. a pair of support stands that can move toward and away from each other are provided on each movable stand;
Each movable base is provided with an interlocking device that converts the push/pull motion of the push/pull shaft into an approaching/separating motion of both support bases, and crossbars each having a holding device are connected from both support bases.

According to the configuration of the present invention, the reciprocating movement of the carriage is transmitted to each movable carriage via the connecting shaft, and the movable carriage can be moved between press positions and between a press position and a standby position. When the carriage moves back and forth, the cam follower is guided by the cam surface and swings the lever back and forth around the horizontal axis. This will be changed to an approach-separation motion. Therefore, by setting the cam surfaces, it is possible to separate these two crossbars from each other when they correspond to the press position, and to move these crossbars away from each other when they correspond to the standby position. It can be brought closer. Furthermore, by operating the interlocking position change device, the amount of push and pull of the push-pull shaft, that is, the expansion/contraction stroke (expansion/contraction width) of both crossbars can be changed while the lever is swung by a predetermined amount. Furthermore, with both crossbars close together, the push-pull shaft is fixed by a fixing device, and the linkage between the push-pull shaft and the lever is released, so that the expansion/contraction stroke is 0 mm and the flavor swings. The desired feed can be performed without being affected by movement.

Embodiment An embodiment of the present invention will be described below based on the drawings.

In FIGS. 7 and 8, reference numeral 1 denotes a bed formed between uprights 2, and a cart 3, which can be carried in and out, is set on top of the bed. Lower molds 4 are arranged on the carriage 3 at predetermined pitches (P), thereby forming press positions 5. An idle position 6 is provided above the uppermost press position 5, and a carry-in section 7 is provided further above. Further, a carry-out section 8 is provided below the lowest press position 5, thereby forming a press line 9. This press line 9
A pair of left and right lifting frames 10 are disposed along the bed 1, and these lifting frames 10 are interlocked with a lifting device 11 provided on the side of the bed 1. An actuating device 1 having a camshaft 12 below the unloading section 8 and adjacent to the bed 1 and linked to a press drive (not shown).
3 is disposed, and the lifting device 11 is interlocked and connected to this actuating device 13. That is, the lifting device 11
A rack shaft 14 is interlocked with the cam shaft 12 via a cam, a cam follower, and a lever (all not shown) and is movable back and forth along the press line 9.
and a pinion 15 that meshes with this rack shaft 14.
The lift shaft 17 is connected to the pinion 15 via a rack 16, and a guide device 18 for the lift shaft 17. The upper end of the lift shaft 17 is fixed to the lift frame 10. The lifting shaft 1
7 are provided at a plurality of locations, and therefore a synchronizer 19 is provided between the lifting shafts 17.

As shown in FIGS. 1 to 6, the elevating frame
A carriage 20 is provided at one end of the frame 10 and is movable back and forth in the longitudinal direction of the frame. That is, the carriage 20 is gate-shaped and fits into the lifting frame 10 from above, and has a plurality of clamping rollers 22 that come into contact with guide rails 21 attached to both sides of the lifting frame 10 from above and below. A plurality of side rollers 2 are supported and guided by the rollers and abutted from the lateral direction.
3. The camshaft 12, which is interlocked with the press drive device via a reduction gear device 33, and the carriage 20 are interlocked and connected by a feed device 24. That is, the feed device 24 includes a feed cam 25 attached to the camshaft 12, an L-shaped feed lever 27 attached to the support shaft 26 so as to be swingable back and forth, and a cam follower 28 attached to the feed lever 27. a roller 29 attached to the upper end of the feed lever 27;
It is composed of a guide body 31 attached to the carriage 20 to form a vertical slide groove 30 into which the roller 29 fits, and a restraining cylinder 32 that biases the cam follower 28 into contact with the feed cam 25. Ru.

A square cylindrical connecting shaft 35 is disposed along the lifting frame 10, and one end of this connecting shaft 35 is connected to the carriage 20, and the lifting frame is connected to the lifting frame via a suitable support device (not shown). It is movably supported on the side of the frame 10. Movable bases 36 are integrally attached to a plurality of locations on the connecting shaft 35 at predetermined pitches P, respectively. The unloading section 8 is placed on the movable table 36.
A first support stand 37 is provided on the side, and a second support stand 40 is provided on the carry-in section 7 side, so that they can move toward and away from each other via rails 38 and slide bodies 39, respectively. A first crossbar 42 is disposed between the first support stands 37 which face each other with the press line 9 in between, via an attachment/detachment device 41, and a first crossbar 42 is provided between the second support stands 40 via an attachment/detachment device 43. A second crossbar 44 is provided. Also, both crossbars 42,
Vacuum cups 45 and 46, which are an example of a holding device, are attached to 44.

The bracket 50 is removed from the underside of the carriage 20.
is installed vertically, and a horizontal shaft 51 perpendicular to the press line 9 is attached to this bracket 50. An inverted T-shaped lever 52 is attached to the horizontal shaft 51 through the center thereof, and the lever 52 is swingable back and forth around the horizontal axis 53. A cam follower 54 is attached to the front end of the lever 52, and a cam plate 56 having a closed loop cam surface 55 on which the cam follower 54 acts is attached to the lifting frame 10. The closed loop cam surface 55 includes a linear downward surface 55a, a linear upward surface 55a opposite to the intermediate portion of the downward surface 55a, and a linear upward surface 55a that is continuous with both ends of the upward surface 55a and extends outwardly. Upward inclined surfaces 55c, 5 divided into upper and lower positions
5d, and an inverted surface 55e that connects the ends of these inclined surfaces 55c and 55d and both ends of the downward surface 55a.
55f. A restraining cylinder 57 is disposed between the rear end of the lever 52 and the carriage 20, and this restraining cylinder 57 serves as an example of an application device that applies pressure to the cam follower 54 to the cam surface 55. A push/pull shaft 58 is disposed along the elevating frame 10, and the push/pull shaft 58 is interlocked with the lever 52 via an actuation direction changing device 71 and an interlocking position changing device 59. That is, the push/pull shaft 58 is disposed above the connecting shaft 35, and one end thereof is supported by an operation direction changing device 71 having a rack and pinion configuration attached to the carriage 20 side.
Further, the operating shaft 7 supported by the operating direction changing device 71
2 is connected to the carriage 20 via a support member 60.
It is supported so that it can be pushed and pulled freely. An arm 62 is connected to one end of the operating shaft 72 via a pin 61 so as to be able to swing vertically. direction and is fitted into an arc-shaped elongated hole 64. In order to change the fitting position of the horizontal pin 63 with respect to the elongated hole 64, a cylinder device 65 is disposed between the arm 62 and the lever 52. can be changed to multiple stages. The arm 62 has a rod portion 62A and a cylindrical portion 62.
The fixing pin 6 has a fitting configuration with B and is operated by a cylinder device 66 attached to the cylindrical portion 62B.
By inserting or removing the arm 62 between the two parts 62A and 62B, the arm 62 itself can be switched between an interlocking state and a separated state. A vertical through hole 68 is formed in the operating shaft 72, and a cylinder device 70 is attached to the carriage 20 for actuating a fixing pin 69 that can be inserted into and removed from the through hole 68.
3.

Each movable table 36 is provided with an interlocking device 75 that converts the push/pull movement of the push/pull shaft 58 into an approaching/separating movement of the support stands 37, 40. That is, the push/pull shaft 58 is constructed by connecting a plurality of members, and the portion of the movable base 36 is formed as a rack shaft portion 58a. A frame body 76 that slidably supports the rack shaft portion 58a is attached to the movable table 36, and a pinion 77 that meshes with the rack shaft portion 58a and a pinion 77 that meshes with the rack shaft portion 58a and the A rack shaft 78 is provided parallel to the rack shaft portion 58a. The rack shaft 78 is fixed 79 to the first support 37, and the push/pull shaft 58 is fixed 80 to the second support 40.

Next, the operation of the above embodiment will be explained.

When the crossbars 42 and 44 are made to expand and contract (move toward and away from each other), as shown in FIG. Make it a rigid body. As shown in FIG. 10, when the feed A of the workpiece 86 is finished, the elevating frame 10 and the like have been raised, and the feed lever 27 is swung to the rear limit to move the carriage 20 and the movable base 36. etc. are being moved to the shipping limit. Also, both crossbars 42, 44
are in the widened state with maximum separation, and furthermore, the cam follower 54 is located on the reversal surface 55f. In this state, the restraint cylinder 57 is contracted to restrain the cam follower 54 downward. Then, the front half is returned B by forward swinging X of the feed lever 27. That is, by swinging the feed lever 27, the carriage 20, the connecting shaft 35, the movable base 36, both support bases 37,
40 is moved together, and both support stands 37, 40 are moved together.
The crossbars 42 and 44 integrated with the
As shown in FIG. 1, it is moved to a standby position 85, which is the center between the press positions 5. During this movement, the cam follower 54 is pressed and guided by the upwardly inclined surface 55d and moves downward, thereby causing the lever 52 to swing forward about the horizontal axis 53. As a result, the actuating shaft 72 is moved to the carrying-in section 8 side via the arm 62, and this movement causes the push/pull shaft 58 to be pulled and moved D via the actuating direction changing device 71, thereby moving the second support stand 40 in the same direction. Further, the pulling movement D causes the rack shaft 78 to move in the opposite direction via the rack shaft portion 58a and the pinion 77, and moves the first support base 37 in the opposite direction, thereby moving both crossbars 42 ,4
4 toward each other (shrinking movement). Therefore, when performing the front half return B, the feed lever 27 is located at the center in the front and back direction as shown in FIG.
As shown in Fig. 11, the standby position 8 is in the retracted state.
It stopped at 5. In this state, the desired press movement is performed, and after the upper mold is raised, the feed lever 27 is swung forward X to its limit, and the rear half is returned C. As a result, both crossbars 42 and 44 are moved via the carriage 20, connecting shaft 35, movable base 36, and both support bases 37 and 40, and are positioned at the upper press position 5 as shown in FIG. During this movement, the cam follower 54 comes into contact with the upwardly inclined surface 55c in FIG. 2, thereby causing the lever 52 to swing backward about the horizontal axis 53. This rocking motion becomes a pushing motion E of the push/pull shaft 58 via the arm 62, etc., and this pulling motion E is transmitted to both crossbars via the pinion 77, rack shaft 78, etc.
42 and 44 (spreading movement). As a result, as shown in FIG. 12, the crossbars 42 and 44 are positioned on both sides at the center of the press at the upper press position 5.
Both vacuum cups 45, 46 are opposed to the workpiece 86 at optimal locations. Next, the lifting frame 10 and the like are lowered by the lifting device 11, and the vacuum cups 45 and 46 are moved to the workpiece 8.
6 and has an adsorption effect. Then, the lifting frame 10 and the like are raised to lift the workpiece 86. At this time, the restraining cylinder 57 is extended and the cam follower 54 is brought into contact with the downward surface 55a. In this state, the feed lever 27 at the forward limit is swung Y to the rear limit and the workpiece 8 is held.
6 is fed by a predetermined pitch P, but at this time, since the cam follower 54 is guided by the linear downward surface 55a, the lever 52 does not swing, and both crossbars 42, 44 is fed in the widened state, and the state shown in FIG. 10 is reached.
Next, the workpiece 86 can be unloaded by lowering the elevating frame 10, rendering the vacuum cups 45, 46 inactive, and then raising them. At this time, the cam follower 54 is on the reversal surface 55f, and returns to the initial state by contracting the restraining cylinder 57 and restraining the cam follower 54 downward.

By repeating the above operations, the workpiece 85 can be sent to the lower press position 5 in sequence, and at that time, the workpiece 85 can be sent from the loading section 7 to the idle position 6, the idle position 6, and the idle position 6.
It is also possible to perform feeding from the press position 5 and from the press position 5 to the unloading section 8.

FIG. 9 shows a circuit for switching the restraint direction of the restraint cylinder 57, and a safety circuit is provided in the pneumatic system.

In FIG. 2, the working distance L from the horizontal axis 53 to the axis of the horizontal pin 63 can be changed arbitrarily by moving the horizontal pin 63 within the elongated hole 64 by operating the cylinder device 65. With this change, the length of movement of the horizontal pin 63 can be changed while the lever 52 is oscillating at a constant rate, which means that the amount of push/pull (length) of the push/pull shaft 58 can be changed. This means that the distance between the crossbars 42 and 44 can be changed depending on the shape of the workpiece 86.

For example, if the workpiece 86 has a small shape and stable feeding can be performed without expanding or contracting, both crossbars 42 and 44 are
The cylinder device 70 in the illustrated fixing device 73 is operated to insert the fixing pin 69 into the through hole 68. Then, the cylinder device 66 is actuated to pull out the fixing pin 67, and the rod portion 62A and the cylindrical portion 62B of the arm 62 are made slidable (expandable and retractable). When the desired pressing operation is performed in this state, the swinging motion of the lever 52 is absorbed by the sliding motion of the arm 62 and is not transmitted to the push-pull shaft 58, and the push-pull shaft 58 is Since it is locked with the fixing pin 69, both crossbars 42 and 44
The desired workpiece 86 remains in its reduced width state.
can be sent.

Effects of the Invention According to the above-described configuration of the present invention, the reciprocating movement of the carriage is transmitted to each movable table via the connecting shaft, and this movable table can be moved between press positions and between the press position and the standby position. Can be done. When the carriage moves back and forth, the cam follower is guided by the cam surface and swings the lever back and forth around the horizontal axis. It is possible to change the movement toward and away from each other. Therefore, by setting the cam surfaces, both crossbars can be separated from each other when they correspond to the press position.
Moreover, when both crossbars correspond to the standby position, these crossbars can be brought close to each other. As a result, both crossbars, which feed the workpiece via the holding device, can hold workpieces of various shapes at the optimal position without bending in the expanded width state during feeding, and are stable. High-speed conveyance is possible. Further, during standby, the space at the standby position can be reduced by reducing the width, making it possible to downsize the entire press line and reduce its cost. Further, since the reciprocating movement of the carriage is used to expand and contract the crossbar, it can be performed more reliably. You can also operate the interlocking position change device to move the lever.
By changing the ratio, it is possible to change the push/pull amount of the push/pull shaft, that is, the expansion/contraction stroke of both crossbars, even though the lever is oscillated to a predetermined degree. Workpieces of various sizes can be easily and stably held and transported. Then, with both crossbars close together, the push-pull shaft is fixed by a fixing device, and the linkage between the push-pull shaft and the lever is released, so that the expansion/contraction stroke is 0 mm.
It is possible to provide a device with more versatility, such as being able to perform the desired feed without being affected by the swinging of the lever, and being able to feed fairly narrow workpieces.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a partially cutaway side view of the feed drive unit, FIG. 2 is a partially cutaway side view of the same main part, and FIG. Fig. 4 is a partially cutaway front view, Fig. 5 is a partially cutaway plan view.
The figure is a partially cutaway plan view of the movable platform part, Figure 6 is a longitudinal sectional front view of the same, Figure 7 is an overall side view, Figure 8 is a plan view of the same, Figure 9 is a system diagram, and Figures 10- FIG. 12 is a perspective view illustrating the operation. 5...Press position, 9...Press line, 10
...Lifting frame, 11... Lifting device, 12...
Camshaft, 13... Actuation device, 20... Carriage, 24... Feeding device, 25... Feeding cam, 27
...Feed lever, 35...Connection shaft, 36...Movable base, 37...First support stand, 40...Second support stand,
42...first crossbar, 45, 44...second crossbar, 46...vacuum cup (holding device), 52...lever, 53...horizontal axis, 54...
...Cam follower, 55...Cam surface, 56...Cam plate, 57...Restriction cylinder (applying device), 58...
...Push/pull shaft, 59...Interlocking position change device, 62
...Arm, 62A...Rod part, 62B...Cylinder part, 67...Fixing pin, 68...Through hole, 69...
...Fixing pin, 71...Operation direction changing device, 73...
...Fixing device, 75...Interlocking device, 77...Pinion, 78...Rack shaft, 85...Standby position, 86
...Workpiece.

Claims (1)

[Scope of utility model registration request] A lifting frame is installed along the press line,
A carriage is provided at one end of this elevating frame and is movable back and forth in the longitudinal direction of the frame, and a connecting shaft that interlocks with this carriage is disposed along the elevating frame, and a predetermined pitch of the connecting shaft is provided. A movable platform is installed at multiple locations, and a lever is provided on the carriage that can freely swing back and forth around the horizontal axis.
A cam plate on which a cam follower attached to the lever acts is attached to the elevating frame, and a push/pull shaft is disposed along the elevating frame and interlocked with the lever via an interlocking position change device. A pulling shaft fixing device is provided, and the push/pull shafts and the lever are configured to be able to be freely disengaged from each other, and each of the movable bases is provided with a pair of support stands that can be moved toward and away from each other, and the push/pull shafts are fixed. A crossbar of a transfer device characterized in that each movable base is provided with an interlocking device that changes the movement into an approaching/separating motion of both support bases, and crossbars each having a holding device are connected from both support bases.
Expansion/contraction stroke conversion device.