JPH0211939Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a device for automatically transporting a workpiece in a press machine by moving the feed bar back and forth and up and down, and in particular improves the mechanism for moving the feed bar up and down. Regarding.

[Background art and problems thereof] The present applicant previously disclosed in Japanese Patent Application No. 60-141993 that a workpiece is carried into a press machine from a stacking machine, and the pressed workpiece is carried out from the press machine to a stacking machine. provided equipment for

Figures 6 to 14 show this device. A device 71 attached to the front side of the press machine 1 has a feed bar 72, and the feed bar 72 descends and rises at the retreat position (the left movement limit position in FIG. 6) in synchronization with the vertical movement of the slide 2 of the press machine 1. death,
Next, it moves forward and descends and rises at the forward position (the right movement limit position in FIG. 6), and then moves backward and descends and rises at the retreat position. By repeating this operation, the workpiece is carried into the press machine 1 from the stacking device 74 by the workpiece clamping device 73 consisting of two suction cups etc. provided on the feed bar 72, and the workpiece is pressed by lowering the slide 2. It is carried out to the stacking device 75.

8 to 10 show the internal structure of the device 71, and as shown in FIG.
A slider 77 that moves is incorporated, and a feed bar holding member 78 in which a feed bar 72 is attached to the slider 77 is assembled with a guide post 79 so as to be vertically movable. As shown in FIG. 8, a crank mechanism 80 consisting of links 80A and 80B is connected to the feed bar holding member 78, and the link 80A is a pinion shaft 8 rotatably inserted into the slider 77.
1, and a pinion 82 and a trifurcated arm 83 as a rotating member are coupled to the pinion shaft 81, and the arm 83 is provided with rollers 84, 85, and 86 as shown in FIG.

As shown in FIG. 9, a belt 88 that reciprocates a predetermined distance by the forward and reverse rotation of a motor 87 is provided inside the device 71, and as shown in FIG. is attached, and the rack member 90 is slidably disposed on the slider 77 and meshes with the pinion 82. As shown in FIG. 10, a cam member 91 extending in the moving direction of the slider 77 is disposed inside the device 71, and the cam member 91 is connected to the intermediate cam portion 9.
2 and terminal cam portions 93 on both sides. As shown in FIG. 11, a circular portion 94 for roller rolling is formed at the end of the terminal cam portion 93, and the center of the circular portion 94 is the rotation member of the arm 83 when the slider 77 reaches its limit of movement. The radius of the circular portion 94 corresponds to the distance from the pinion shaft 81, which is the center of rotation of the arm 83, to the rollers 84, 85, and 86. As shown in Fig. 13, the circular part 94
A downwardly facing step portion 94A is formed at the bottom, and as shown in FIG. 11, the step portion 94A is continuous with the lower surface of the intermediate cam portion 92.

When the belt 88 is driven by the motor 87, the rack member 90 tries to move relative to the slider 77, but the pinion 82 cannot rotate because the rollers 85 and 86 as cam followers of the arm 83 are in contact with the cam member 91. That is, arm 83
The rotation of the slider 77 is prevented by the contact of the rollers 85 and 86 with the cam member 91, and therefore the rack member 90 cannot be moved, so the slider 77 moves laterally together with the belt 88, and the slider 77 shown in FIG.
When the projection 77A comes into contact with the stopper member 95, the slider 77 reaches its limit of movement. At this time, the rollers 84, 85, 86 have reached the circular portion 94 for roller rolling at the end of the cam member 91, and as shown in FIG.
The belt 88 can roll along the outer peripheral surface of the belt 88.
As the arm 83 moves further, the arm 83 rotates as the rack member 90 moves relative to the slider 77.

As a result, the pinion shaft 81 rotates, and the feed bar 72 is rotated by the crank operation of the crank mechanism 80.
is descending. After the feed bar 72 reaches its lower limit, the motor 87 starts to rotate in the opposite direction, and as a result, the rollers 84, 85, and 86 roll in the opposite direction on the outer peripheral surface of the circular portion 94, causing the feed bar 72 to rise. When the rise limit is reached, the roller 85,
Since the arm 86 contacts the lower surface of the cam member 91 again, the rotation of the arm 83 is prevented, and the slider 77 moves together with the belt 88 in the opposite direction.
When the slider 77 reaches the limit of movement on the opposite side due to the contact between the projection 77A and the stopper member 95, the arm 83 is rotated in the same manner as described above, and the crank mechanism 8 is rotated.
0, the feed bar 72 operates to lower and raise.

As the feed bar 72 repeats the above operation, the work is automatically conveyed from the disk stacking device 74 shown in FIG. 6 to the press machine 1, and then from the press machine 1 to the stacking device 75.

In the above, as shown in FIG.
When the slider 77 passes the position and reaches the B position, the slider 77 reaches its limit of movement. Since the roller 86 is not in contact with the stepped portion 94A of the circular portion 94 from the A position to the B position, the roller 86 can move in the vertical direction during this period. For this reason, the arm 83 and the crank mechanism 80 are in an unstable state, and the feed bar 7
The mechanism for moving up and down 2 has a low structural rigidity. As a result, it is difficult to stably move the feed bar 72 up and down in the forward and backward positions, and the motor 8
If the slider 77 were to be moved at high speed by the high speed rotation of the motor 7, practical problems would occur, and the motor 87 would have to be rotated at a low speed.

[Purpose of the invention] The purpose of the invention is to improve the above-mentioned conventional device so that vertical movement of the feed bar can be performed stably in the forward and backward positions, and to realize high-speed operation by high-speed movement of the slider. The present invention is to provide a workpiece conveyance device for a press machine that enables this.

[Means and effects for solving the problem] Therefore, the device according to the present invention is a feed bar in which a feed bar holding member is assembled to a slider that moves in the horizontal direction so as to be movable up and down, and a work clamping device is provided on the feed bar holding member. A rotary member having a plurality of rollers is coupled to the feed bar holding member via a crank mechanism, and when the rotary member rotates, the crank mechanism is cranked to enable vertical movement of the feed bar, A cam member extending in the direction of movement of the slider is provided, and the roller is brought into contact with this cam member to prevent rotation of the rotating member, and the end of the cam member is provided with a cam member that extends in the direction of movement of the slider. In a workpiece conveyance device for a press machine, which is provided with a roller rolling circular part whose center coincides with the member, and in which the rotary member can rotate in the roller rolling circular part, one of the plurality of rollers is rotated. It is arranged at the center of the rotating member, and a groove is formed in the circular part for roller rolling, into which the roller is inserted and engaged when the slider approaches its travel limit, and this groove is formed up to the center of the circular part for roller rolling. With the roller engaged in the groove and positioned in the vertical direction, another roller is rolled along the outer circumferential surface of the circular roller rolling portion to rotate the rotating member and crank the crank mechanism. This is how it was done.

[Example] FIGS. 1 to 3 show the internal structure of a device 3 according to this example. This device 3 is attached to the front of the press machine 1 in the same way as the conventional device 71 shown in FIGS. 6 and 7. The feed bar 5 attached to the feed bar holding member 4 is provided with a work clamping device consisting of a vacuum suction cup, a magnet, or the like. Inside the device 3, as shown in FIG.
is vertically movable relative to the slider 6 by a guide post 9 inserted into a guide hole 8.

Two pulleys 10 are rotatably attached to the lower part of the slider 6, and a disc-shaped rotating member 11 is rotatably attached to the upper part of the pulleys 10.
A belt 14 is stretched around these pulleys 10, the rotating member 11, and guide pulleys 12 and 13 arranged on the left and right sides inside the device 3, and a belt 16 is stretched around a pulley 15 coaxial with the guide pulley 13. The rotation of the servo motor 17 is transmitted to the belt 14, and the belt 14 reciprocates for a predetermined length by rotating the servo motor 17 forward and backward. The upper end of a connecting rod 18 is connected to the feed bar holding member 4, and the lower end of the connecting rod 18 is connected to the outer peripheral side of the rotating member 11. Therefore, the feed bar holding member 4 is connected to the rotating member 11 through a crank mechanism 19 by the connecting rod 18. is connected to.

In this embodiment, the connecting rod 18 has a right-handed threaded shaft 18A.
It is of a turnbuckle type, consisting of a left-hand threaded shaft 18B, a nut cylinder shaft 18C screwed onto these threaded shafts, and a lock nut 18D, and its length is freely adjustable.

Three rollers 20, 21, and 22 as cam followers are rotatably attached to the rotating member 11, and one roller 20 in particular is attached to the center shaft 23 of the rotating member 11 with a bolt 24 as shown in FIG. Since the roller 20 is attached to the rotating member 11, the roller 20 is disposed at the center of the rotating member 11. The other rollers 21 and 22 are arranged at equal distances from the center of the rotating member 11, as shown in FIG.

As shown in FIG. 2, a cam member 25 is provided in front of the rotating member 11 and extends in the direction of movement of the slider 6. Connecting cam portions 28 are disposed on both sides of the intermediate cam portion 27 and are slidable on the intermediate cam portion 27 through concave and convex fitting.
and a circular portion 29 for roller rolling fixed to the outer end side of each connecting cam portion 28. As shown in FIGS. 4 and 5, the intermediate cam portion 27 and the connecting cam portion 28 are formed in a narrow shape that continues in the horizontal direction, which is the moving direction of the slider 6, and the roller 20 is attached to the lower surface of the intermediate cam portion 27 and the connecting cam portion 28.
However, the rollers 21 and 22 can each come into contact with the upper surface. As shown in FIG. 5, the circular portion 29 is formed in a circular shape except for the upper portion to which the connecting cam portion 28 is connected, and its radius corresponds to the length from the roller 20 to the rollers 21 and 22. Circular part 2
9 is arranged at a position where the center of rotation of the rotating member 11 when the slider 6 reaches its travel limit, that is, the center axis 23 and the center of the circular portion 29 coincide with each other. A groove 30 cut from the cam part 27 side is formed, and this groove 30 has continuity with the lower surface of the intermediate cam part 27 and the connecting cam part 28 and extends to the center of the circular part 29. .

As shown in FIG.
9, a flat plate part 32 at the front, and a square block part 33 connecting these parts. Device 3 as shown in Figure 2
A guide portion 26A extending along the entire length of the device 3 in the lateral direction is integrally formed in the case 26, and this guide portion 26A is provided with two guide grooves 34 corresponding to the left and right sliding bodies 31. As shown in FIG. 4, the sliding body 31 is arranged so as to be movable laterally by having a square block portion 33 slidably fitted into a guide groove 34. As shown in FIG. A screw shaft 35 is formed in the flat plate portion 32 of the sliding body 31. When a flat washer 36, a disc spring 37, and a flat disc spring 38 are fitted to the screw shaft 35 and a nut 39 is tightened, the elastic force of the disc spring 37 is The upper and lower parts of the flat washers 36 are the guide parts 2.
6A, and the sliding body 31 is fixed at a desired position in the guide groove 24 by this pressure contact force.

U-shaped bridge members 40 are provided on both the left and right sides of the screw shaft 35.
are arranged, and these bridge members 40 are fixed to the flat plate part 32 with bolts 41, but the tips of the bridge members 40 do not contact the guide part 26A, and a small gap is maintained between them and the guide part 26A. There is. Square block part 33
A screw hole 42 is formed through the screw hole 42 .
In case 2, the horizontal direction is the axial direction as shown in Figure 2.
The feed screw shaft 43 inserted through the hole 6 is inserted and screwed together. An end portion 43A of the feed screw shaft 43 is exposed from the case 26, and when the handle 44 is engaged with the end portion 43A and rotated, the feed screw shaft 43 is rotated.

Next, the effect will be explained.

When the servo motor 17 shown in FIG. 1 rotates forward, the belt 14 runs, and the rotating member 11 of the slider 6, over which the belt 14 is spanned, attempts to rotate. However, since the rollers 20, 21, and 22 attached to the rotating member 11 are in contact with the upper and lower surfaces of the intermediate cam portion 27 of the cam member 25 as shown in FIG. 5, the rotating member 11 cannot rotate. The slider 6 moves laterally together with the belt 14. As the slider 6 moves laterally, the rollers 20, 21, and 22 move from the intermediate cam part 27 to the connecting cam part 28, and as the slider 6 further moves, the rollers 20, 21, and 22 are moved to the center of rotation of the rotating member 11. 20 is inserted into and engaged with the groove 30 of the circular part 29 for roller rolling, and when the roller 20 abuts the end of the groove 30 and reaches the center of the circular part 29, further movement of the slider 6 is blocked. . That is, the circular portion 29 and the roller 20 also serve as a stopper member that defines the limit of movement of the slider 6.

Even after the roller 20 contacts the end of the groove 30, the servo motor 17 continues to rotate in the normal direction. At this time, since the roller 20 is disposed at the center of the rotating member 11 and the rollers 21 and 22 can roll along the outer circumferential surface of the circular portion 29, the rotating member 11 rotates as the belt 14 runs. Therefore, the crank mechanism 19 is cranked by the connecting rod 18, and the feed bar 5 is lowered.
When the amount of descent of the feed bar 5 reaches a certain amount,
In other words, when the amount of rotation of the rotation member 11 reaches a certain amount, the forward rotation of the servo motor 17 is stopped.

Next, the servo motor 17 starts rotating in the opposite direction, causing the rollers 21 and 22 to roll along the outer circumferential surface of the circular portion 29 in the opposite direction to the above, and due to the reverse rotation of the rotating member 11, the rollers 21 and 22 rotate through the crank mechanism 19. As a result, the feed bar 5 is raised. When the feed bar 5 reaches its upper limit, the rollers 21 and 22 come into contact with the upper surface of the connecting cam portion 28 again, preventing the rotating member 11 from rotating in the opposite direction.
4 starts to move in the opposite direction, and the roller 20 comes out of the groove 30.

By the reverse movement of the slider 6, the roller 20 is inserted into and engaged with the groove 30 of the circular portion 29 on the opposite side, and when the roller 20 comes into contact with the terminal end of this groove 30, the slider 6 reaches its limit of movement. Thereafter, the feed bar 5 is lowered by the rollers 21 and 22 rolling along the outer circumferential surface of the circular portion 29 in the same manner as described above, and when the servo motor 17 changes from reverse rotation to forward rotation, the feed bar 5 is raised. As the servo motor 17 continues to rotate in the forward direction, the slider 6 returns to its initial travel limit.

As the feed bar 5 repeats the above operations, the workpiece is carried into the press machine 1 from the stacking device 74 shown in FIG. It will be transported to

When the feed bar 5 moves up and down at the limit of movement of the slider 6, the roller 20 engages with the groove 30 of the circular portion 29 for roller rolling and is positioned in the up and down direction. 2
1 and 22 roll along the outer peripheral surface of the circular portion 29, the rotation of the rotation member 11 and the crank operation of the crank mechanism 19 due to this rotation are performed while preventing wobbling. The vertical movement is performed as being stable. In this way, the engagement of the roller 20 with the groove 30 causes the feed bar 5 to
Since the mechanism for vertically moving the feed bar 5 has a high rigidity structure, the high speed movement of the slider 6 caused by the high speed rotation of the servo motor 17 moves the feed bar 5.
This makes it possible to increase the forward and backward movement speed and vertical movement speed of the vehicle, enabling high-speed operation. Also, when the slider 6 is moving in the horizontal direction, the three rollers 2
0, 21, 22 are intermediate cam portions 2 of the cam member 25
7. Since it comes into contact with both the upper and lower surfaces of the connecting cam part 28 and pinches them from above and below, the forward and backward movements of the feed bar 5 can be performed stably without wobbling of the feed bar 5. .

Furthermore, in this embodiment, the belt 14 is spanned over the pulley 10 attached to the slider 6 and the rotating member 11 to move the slider 6 in the lateral direction, so that the belt 14 can be moved freely on the slider as in the conventional device. The arranged rack member is connected to the belt and the pinion is not engaged with the rack member. Therefore, since the slider does not have sliding parts such as rack members, problems such as wear and rattling do not occur, and furthermore, there is no effect due to backlash between the rack member and the pinion. Further, since it is not necessary to ensure the sliding stroke of the rack member, the length of the slider 6 can be shortened, and the device 3 can be made smaller. Further, as described above, the circular portion 29 is attached to the slider 6 together with the roller 20.
Since it also serves as a stopper member, there is no need to separately prepare a stopper member unlike conventional devices.

For example, the distance between the disk stack device 74 and the press machine 1, the distance between the press machine 1 and the stack device 7, etc.
When it is necessary to change the forward and backward movement stroke of the feed bar 5, such as when the distance between the feed bar 5 and
After releasing the pressing force on A and thereby allowing the sliding body 31 to move freely relative to the guide groove 34, the feed screw shaft 43 shown in FIG.
4, and the position of the sliding body 31 is changed and adjusted by the feeding action of the feed screw shaft 43, and then the nut 39 is tightened again. As a result, the position of the circular portion 29, which is a part of the sliding body 31, is adjusted, and the forward and backward movement stroke of the feed bar 5 is changed. In addition,
In this case, the connecting cam part 28 whose outer end is connected to the circular part 29 also moves together, but this movement is absorbed by the sliding of the inner end of the connecting cam part 28 with respect to the intermediate cam part 27. Ru.

As described above, the sliding body 31 is moved by the flat washer 36 due to the elastic force of the disc spring 37 when the nut 39 is tightened.
is in a fixed state by coming into pressure contact with the guide portion 26A, but if the slider 6 runs out of control due to a failure in the control device of the servo motor 17 and the roller 20 crashes into the end of the groove 30 of the circular portion 29, this If the collision force is larger than the fixing force due to the pressure welding, there is a risk that the sliding body 31 will be moved and the threaded portion of the feed screw shaft 43 will be destroyed; however, in this embodiment, the sliding body 31 has a guide portion 26A. When the bridge member 40 facing the groove 30 is attached with a small gap and the roller 20 collides with the end of the groove 30, the sliding body 3
1 is a piece member 4 that rotates around the vertical direction.
0 comes into contact with the guide portion 26A, and the sliding body 31 is prevented from moving due to the frictional force caused by this contact, so that the threaded portion of the feed screw shaft 43 is destroyed by the self-locking mechanism of the sliding body 31 by the bridge member 40. can be prevented.

In addition, when it is necessary to change the height level of the vertical movement of the feed bar 5, such as when the height dimension of the mold set in the press machine 1 is changed, the crank mechanism shown in FIG. The length of the turnbuckle type connecting rod 18 constituting the feed bar 19 can be adjusted, and in this embodiment, the vertical movement height level of the feed bar 5 can be adjusted as well as the forward and backward stroke of the feed bar 5.

The device 3 according to the above embodiment was for conveying workpieces from the stacking device to the press machine and from the press machine to the stacking device, but the device according to the present invention also has a plurality of devices forming a press line. It can also be applied to a workpiece transport device for sequentially transporting workpieces to a press machine, and can also be applied to a transfer transport system for sequentially transporting workpieces to each processing stage in a single press machine equipped with multiple processing stages. Applicable to equipment.

[Effects of the invention] According to the invention, the vertical movement of the feed bar is performed stably, the operation of the feed bar is ensured, and high-speed operation is also possible due to the high-speed movement of the slider.

[Brief explanation of drawings]

Figure 1 is a front sectional view showing the internal structure of the device, Figure 2 is a front sectional view showing the internal structure of the device.
The figure is a plan sectional view, FIG. 3 is a cross-sectional view taken along the line -- in FIG. 6 is a front view of the press machine with the conventional device attached, FIG. 7 is a side view of the same, FIGS. 8 to 14 show the conventional device, and FIG. 8 shows the internal structure of the conventional device. 9 is a sectional view taken along the - line in FIG. 8, FIG. 10 is a sectional view taken along the - line in FIG. 8, and FIG. 11 is a rack member in a conventional device.
A front view showing the positional relationship of the pinion, etc., FIG. 12 is a front view showing the action of the rack member, etc., FIG. 13 is a perspective view showing the shape of the terminal cam part shown in FIGS. 11 and 12, FIG. 14 is a front view of the main parts to show the problems of the conventional device. 1...Press machine, 4,78...Feed bar holding member, 5,72...Feed bar, 6,77
... Slider, 11, 83 ... Rotating member, 19,
80...Crank mechanism, 20, 21, 22, 8
4, 85, 86... roller, 25, 91... cam member, 29, 94... circular portion, 30... groove.

Claims (1)

[Scope of utility model registration request] A feed bar equipped with a work clamping device is attached to a feed bar holding member, and this feed bar holding member is assembled to a slider that moves in the lateral direction so as to be movable up and down, and a rotating member equipped with a plurality of rollers is attached to the feed bar holding member via a crank mechanism. a cam member extending in the direction of movement of the slider, which connects the rotary members to enable crank operation of the crank mechanism by rotation of the rotary member, and prevents rotation of the rotary member by contact with the roller; ,
In a work conveyance device of a press mechanism in which the rotary member can be rotated by providing a circular portion for rolling a roller at the end of the cam member, the center of which coincides with the rotary member when the slider reaches its travel limit, One roller among the plurality of rollers is arranged at the center of the rotating member, and a groove is provided in which the roller is inserted into and engaged with a circular roller rolling portion of the cam member and extends to the center of the circular portion. A work conveyance device for a press machine, characterized in that another roller is caused to roll along the outer peripheral surface of a circular portion for roller rolling.