JPH0321776Y2 - - 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 an elevating shaft pullback device of the device.

Conventional technology In the past, a feed bar with fingers attached at predetermined pitches was disposed along a press line, and the feed bar was moved up and down and reciprocated in the length direction to control the workpiece with the fingers. They were holding and transporting things. Recently, servo motors are often used to drive conveyance devices.

Problems to be Solved by the Invention According to the conventional structure as described above, if trouble occurs in the servo motor or its control system, there is a risk of damaging the fingers, mold, feed bar, etc.

Means for Solving the Problems In order to solve the above-mentioned problems, the elevating shaft pullback device of the transfer device according to the present invention has elevating frames arranged on both sides of the press line, and between the two elevating frames, the press line and A cross bar is provided in the orthogonal direction, a holding device for holding the workpiece is provided on the cross bar, and a lifting device linked to the lifting frame is connected to a drive shaft driven by a servo motor and this drive shaft. It is composed of a plurality of elevating shafts that are interlocked with each other via shafts, the elevating frame is attached to the upper ends of these elevating shafts, and a forced lowering cam is attached to a cam shaft that is interlocked with the press drive device. A cam lever corresponding to the forced lowering cam is provided, a contact member whose position can be freely adjusted is provided on the connecting shaft of the lifting device, and the free end of the cam lever is brought into contact with the contact member from the direction of the downward action. It can be configured freely.

According to the configuration of the present invention, the forward and reverse rotation of the servo motor is transmitted to the lifting shaft via the drive shaft, and the lifting frame, which is the feed bar in the transfer device, can be moved up and down. At that time, by adjusting the timing so that the forced lowering cam does not act on the cam lever side when the connecting shaft of the lifting device is operating normally, the lifting movement of the lifting frame is affected by the forced lowering cam. It is done without any trouble. If the elevating device becomes inoperable due to some trouble and the elevating frame is not at its lower limit position, the cam lever will stop within the locus of action of the forced lowering cam. At this time, since the camshaft is being driven, the above-mentioned timing will be shifted, and the rotating forced lowering cam will swing the cam lever, and this swing will cause the lifting device to move through the object to be contacted. will be forced to work downward. Further, the position of the object to be contacted can be adjusted according to the slide adjustment or the level of the elevating frame.

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

In FIGS. 1 to 4, reference numeral 1 denotes a bed formed between uprights 2, on which a cart 3 that can be carried in and out is set. A predetermined pitch P is placed on the trolley 3.
A lower mold 4 is disposed at the base, thereby forming a press position 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. A pair of elevating frames 10, which are feed bars in the transfer device, are arranged along the press line 9 and on the left and right sides thereof.
It is linked to a lifting device 11 provided on the side. This lifting device 11 is operated by a servo motor 1 attached to the bed 1 side.
00 and a reducer 101 to this servo motor 100.
a drive gear 102 interlockingly connected to the drive gear 102 via a passive gear 103 and a drive shaft 104 disposed in a lateral direction orthogonal to the press line 9;
In addition, a plurality of lifting shafts 109 are interlocked with each other via a rack 105 and a pinion 106, or a synchronizing portion 108 such as a lift connecting shaft 107 in the longitudinal direction, and a rack 105 and a pinion 106 similar to those described above. and a guide device 110 for the lifting shaft 109.
The elevating frame 10 is installed between the upper ends of the . An actuating device 13 having a camshaft 12 interlocked with a press drive (not shown) is disposed below the unloading section 8 and adjacent to the bed 1.

As shown in FIGS. 6 to 11, a carriage 20 is provided at one end of the elevating 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 is supported and guided by a plurality of clamping rollers 22 that abut from above and below guide rails 21 attached to both sides of the lifting frame 10. It is guided by a plurality of side rollers 23 that abut from the lateral direction. 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 feeding device 24 is connected to the camshaft 12.
a feed cam 25 attached to the feed lever 25, an L-shaped feed lever 27 attached to the support shaft 26 so as to be swingable, a cam follower 28 attached to the feed lever 27, and a roller 29 attached to the upper end of the feed lever 27.
, 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 rectangular 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 is connected to the lifting frame 10 side via a suitable support device (not shown). It is movably supported. 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 at a position on the side, and a second support stand 40 is provided at a position on the carry-in section 7 side, respectively, so as to be movable toward and away from each other via a rail 38 and a slide body 39. A first cross bar 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 cross bar 42 is provided between the second support stands 40 via an attachment/detachment device 43. A second crossbar 44 is provided. Also, both cross bars 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 55b opposing the intermediate portion of the downward surface 55a, and a linear upward surface 55b that is continuous with both ends of the upward surface 55a and becomes higher toward the outside. Upward inclined surfaces 55c, 55 divided into front and rear
d, and inverted surfaces 55e and 5 that connect the ends of these inclined surfaces 55c and 55d and both ends of the downward surface 55a.
5f. A restraining cylinder 57 is disposed between the rear end of the lever 52 and the carriage 20, and this restraining cylinder 57 is connected to the cam follower 5.
4 to the cam surface 55 under pressure. A push-pull shaft 58 is disposed along the elevating frame 10, and the push-pull shaft 58 is interlocked with the lever 52 through an actuation direction changing device 71 and an interlocking position changing device 59. In other words, the push/pull shaft 5
8 is disposed above the connecting shaft 35, and one end thereof is supported by an operating direction changing device 71 of 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. It fits into the elongated hole 64 of. 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 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.

A forced lowering cam 90 is attached to the camshaft 12 as shown in FIGS. 3 and 4. A cam lever 91 corresponding to the forced lowering cam 90 is provided so as to be swingable back and forth via a support shaft 92, and the lower end of this cam lever 91 is connected to the forced lowering cam 90.
A cam follower 93 facing the is attached. The lift connecting shaft 107 of the elevating device 11 is provided with an abutted body 94 whose position is freely adjustable. That is, the lift connecting shaft 107 is provided with a movable body 96 that is guided by the guide rail 95 and is movable in the length direction, and the abutted body 94 is attached to the end of the movable body 96 on the carry-in section 7 side. The movable body 96 has a nut body 97, and a screw shaft 98 screwed into the nut body 97 is rotatably supported by a lift connecting shaft 107. The cam lever 91 and the lift connecting shaft 1
A tension spring 99 is interposed between the cam lever 91 and the cam lever 91, so that the upper end of the cam lever 91 is urged to contact the object 94.

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), the fixing pin 69 of the fixing device 73 is pulled out, and the fixing pin 67 is inserted, as shown in FIG. Let it change. As shown in FIG. 13, when the feed A of the workpiece 86 is finished, the elevating frame 10 and the like have risen, and the feed lever 27 swings to the rear limit to feed the carriage 20, movable base 36, etc. It has been moved to a limited extent. Also, both cross bars 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 the 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. 4, it is moved to the 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 actuation 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 actuation direction conversion device 71, and the second support base 40 is moved in the same direction. Furthermore, the pulling motion D is
The rack shaft 78 is moved in the opposite direction via the rack shaft portion 58a and the pinion 77, and the first support base 37
is moved in the opposite direction, and both crossbars 42,
44 are moved toward each other (shrinking movement). Therefore, when performing the front half return B, the feed lever 27
is located at the center in the longitudinal direction as shown in FIG. 7, and both crossbars 42 and 44 are in the standby position 85 in the retracted state as shown in FIGS. 1, 2, 10, and 14. It's stopped. In this state, the desired press movement is performed, and after the upper die is raised, the feed lever 27 is swung forward X to its limit, and the rear half is returned C. As a result, the carriage 20, the connecting shaft 35,
Both cross bars 42 and 44 are moved via the movable table 36 and both support tables 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. 7, 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 causes the separation motion (spreading motion) of both crossbars 42, 44 via the pinion 77, rack shaft 78, etc. Become. As a result, as shown in FIG. 15, the cross bars 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 will face 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, the cam follower 54 is guided by the linear downward surface 55a, so the lever 52 does not swing, and both cross bars 42, 44 are moved. It is fed and moved in the widened state to reach the state shown in FIG. 13.
Next, the workpiece 86 can be lowered by lowering the elevating frame 10, rendering the vacuum cups 45 and 46 inactive, and then raising it. 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, from the carry-in section 7 to 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. 12 shows a circuit for switching the restraint direction of the restraint cylinder 57, and a safety circuit is provided in the pneumatic system.

During normal operation as described above, the timing is adjusted so that the forced lowering cam 90 does not act on the cam follower 93, as shown by the solid line and the imaginary line in FIG. This is done without being influenced by 90. When the elevating device 11 becomes inoperable due to some trouble and the elevating frame 10 stops at a position that is not at its lowering limit, the cam lever 91 stops within the action locus Z of the forced lowering cam 90 as shown in FIG. Become. At this time, since the camshaft 12 is being driven, the above-mentioned timing is shifted, so the forced lowering cam 90 rotates from the solid line to the imaginary line, contacts the cam follower 93, and moves the cam lever 91 with the arrow It will swing in the direction. This amount of oscillation is determined by the amount of the abutted body 94 and
6. Transmitted to the lift connection shaft 107 via the nut body 97 and the screw shaft 98, and this lift connection shaft 107
is moved to the unloading side, that is, the lifting device 11 is forcibly lowered to bring the lifting frame 10 to its lowering limit. Note that by rotating the screw shaft 98, the position of contact by the object to be contacted 94 can be adjusted.

In FIG. 7, 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 in constant rocking, which means that the amount of push/pull (length) of the push/pull shaft 58 can be changed. The distance between the cross bars 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, when both crossbars 42 and 44 are in the reduced width state,
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 operated to pull out the fixing pin 67, and the rod portion 62A and the cylindrical portion 62B of the arm 62 are made slidable (extendable 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 connected to the fixing pin 69. Since both crossbars 42 and 44 are locked,
The desired workpiece 86 remains in its reduced width state.
can be sent.

Effects of the invention According to the configuration of the invention described above, the forward and reverse rotation of the servo motor is transmitted to the lifting shaft via the drive shaft,
The elevating frame, which is the feed bar in the transfer device, can be raised and lowered. At that time, when the connecting shaft of the lifting device is operating normally,
By adjusting the timing so that the forced lowering cam does not act on the cam lever side, the vertical movement of the elevating frame can be performed without being affected by the forced lowering cam. If the elevating device becomes inoperable due to some trouble and the elevating frame is not at the lowering limit position, the cam lever will stop within the locus of action of the forced lowering cam, and since the camshaft is being driven at this time, the above-mentioned The timing will be off. Therefore, the rotating forced lowering cam swings the cam lever, and this swinging forces the lifting device to lower via the object to be contacted, thereby preventing damage to the various parts. Further, the position of the object to be contacted can be adjusted according to the slide adjustment or the level of the elevating frame.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is an overall side view, Fig. 2 is a plan view of the same, Fig. 3 is a partially cutaway plan view of the main part, and Fig. 4 is a view of the pull-back device section. 5 is a partially cutaway side view, FIG. 6 is a partially cutaway side view of the feed drive unit, FIG. 7 is a partially cutaway side view of the same main part, and FIG. 8 is a partially cutaway side view of the same main part. Fig. 7 is a partially cutaway front view, Fig. 9 is a partially cutaway plan view of the same, Fig. 10 is a partially cutaway front view of Fig. 7;
11 is a longitudinal sectional front view of the movable platform, FIG. 12 is a system diagram, and FIGS. 13 to 15 are perspective views for explaining the operation. 5...Press position, 9...Press line, 10
...Lifting frame, 11... Lifting device, 12...
Cam shaft, 20...carriage, 24...feeding device, 37...first support stand, 40...second support stand,
42... First crossbar, 44... Second crossbar, 45, 46... Vacuum cup (holding device), 52... Lever, 56... Cam plate, 59...
...Interlocking position changing device, 71...Operation direction changing device, 73...Fixing device, 75...Interlocking device, 85
... Standby position, 86 ... Workpiece, 90 ... Forced lowering cam, 91 ... Cam lever, 94 ... Abutted object, 96 ... Movable body, 97 ... Nut body, 10
0... Servo motor, 104... Drive shaft, 107
... Lift connection shaft, 109 ... Lifting shaft.

Claims (1)

[Scope of utility model registration request] Lifting frames are installed on both sides of the press line,
A crossbar is provided between these lifting frames in a direction perpendicular to the press line, and a holding device for holding the workpiece is provided on this crossbar, and the lifting device interlocked with the lifting frame is driven by a servo motor. It consists of a drive shaft, and a plurality of elevating shafts that are interlocked with this drive shaft via connecting shafts, and the elevating frame is attached to the upper ends of these elevating shafts, and a camshaft that is interlocked with the press drive device. A cam for forced lowering is installed, a cam lever corresponding to the cam for forced lowering is provided, a contact member whose position can be freely adjusted is provided on the connecting shaft of the lifting device, and the cam lever is pressed against the contact member. 1. A lifting shaft pullback device for a transfer device, characterized in that a free end is configured to be able to come into contact with the free end from a direction of downward action.