JPS647002Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a feed bar clamp/unclamp and lift/down device for conveying a workpiece between molds in a three-dimensional transfer press.

[Prior Art] Conventionally, in a three-dimensional transfer press, a pair of feed bars that transport a workpiece between molds is clamped and unclamped (a pair of feed bars are brought closer and separated from each other), and a pair of feed bars is lifted down (a pair of feed bars is raised, Utility Model Application No. Sho 53-173061 is known as a device for operating the lowering.

Therefore, this will be explained with reference to FIG. In the figure, a pair of movable bodies 11, 11 are mounted in the unit case 3 in the clamp/unclamp direction (first direction).
It is provided so as to be movable in the horizontal direction (in the figure). On one side (on the left side in FIG. 1) of the movable body 11, a crank 4 having spline shaft portions 4a and 4b horizontally protruding from both ends thereof in the clamping/unclamping direction is rotatably supported. . The crank 4 is engaged with a horizontal groove (not shown) of a feed bar receiver 2 provided on the one movable body 11 so as to be able to rise and fall freely,
One feed bar 1 is held at the upper end of this feed bar receiver 2.

Further, the other moving body 11 (on the right side in FIG. 1) rotatably supports a crank 5 having a spline shaft portion 5a horizontally protruding from one end thereof in the clamping/unclamping direction. The horizontal groove of the feed bar receiver 2 is engaged with the crank 5 in the same manner as described above, and the other feed bar 1 is held at the upper end of the feed bar receiver 2. Both moving bodies 11, 11
Spline shaft portions 4a, 5a protruding oppositely from
are engaged with internal teeth at both ends of a hollow shaft 6 rotatably supported within the unit case 3 so as to be movable in the axial direction.

Further, internal teeth of a pinion 27 are engaged with the spline shaft portion 4b protruding from one movable body 11 so as to be movable in the axial direction. One end of a lever 24, whose central portion is rotatably supported on the body of the press, is rotatably connected to the rack 26 which meshes with the pinion 27 via a rod 25. A cam follower 24a that follows a lift/down cam 22 provided on one side of the slide 21 is rotatably provided at the other end of the lever 24.

Therefore, by raising and lowering the slide 21, the lever 24
When the rack 26 is raised and lowered via the rod 25, the spline shaft portion 4b is reciprocated by 180° via the pinion 27 that meshes with the rack 26. Then, since the crank 4 also reciprocates by 180 degrees, one of the feed bars 1 is moved up and down via the feed bar receiver 2, that is, lifted down. at the same time,
Since the rotation of the crank 4 is transmitted to the crank 5 via the spline shaft portion 4a, the hollow shaft 6, and the spline shaft portion 5a, the other feed bar 1 is also moved up and down in the same way as the one feed bar 1, that is, lifted and down. Ru.

On the other hand, racks 8 and 9 are provided facing each other from the moving bodies 11 and 11 and facing in the clamping/unclamping direction. The racks 8 and 9 are engaged from both sides with a pinion 7 rotatably provided on a vertical shaft 10 within the unit case 3. In addition, the other moving body 11
and a crank pin 32 provided eccentrically on the shaft of the pinion 31 are connected via a connecting rod 20. The rack 30 meshing with the pinion 31 is connected to one end of a lever 28 whose central portion is rotatably supported on the body of the press via a rod 29. The other end of the lever 28 is provided with a cam follower that follows the clamp/unclamp cam 23 provided on the other surface of the slide 21.

Therefore, by raising and lowering the slide 21, the lever 28
When the rack 30 is raised and lowered via the rod 29, the pinion 31 meshing with the rack 30 is reciprocated by a predetermined angle. Then, the crank pin 32 is reciprocated by a predetermined angle in the left and right directions in FIG. Moved back and forth. At the same time, one movable body 11 moves in the opposite direction to the other movable body 11 via the racks 9, 8 and pin-on 7, so that both movable bodies 11, 11 approach and separate from each other. Therefore,
A pair of feed bars 1, 1 also approach each other, move away from each other,
In other words, clamp/unclamp operations are performed.

[Problems to be solved by the invention] In general, if the minimum internal width when clamping a pair of feed bars is narrow, it can be applied to smaller workpieces, and if the clamping/unclamping stroke length is large, For example, it has a wide range of applications.

In the conventional device described above, both moving bodies 11, 11
The lengths of the racks 8 and 9, the spline shaft portions 4a and 5a, and the hollow shaft 6, which are projected from opposite sides, limit the minimum internal width during clamping operation and the stroke length during clamping and unclamping.

In other words, to narrow the minimum internal width, easy 8,
9 and the spline shaft portions 4a, 5a must be shortened, but if these are shortened, the stroke length of clamping/unclamping becomes smaller. On the other hand, in order to increase the stroke length of the clamp/unclamp, it is necessary to lengthen the racks 8, 9 and the spline shaft portions 4a, 5a, but when these lengths are lengthened, the minimum internal width becomes wider.

The purpose of the present invention was to eliminate these conventional drawbacks. Even when the minimum internal width is maintained at the optimum dimension when a pair of feed bars are clamped, the stroke length The object of the present invention is to provide a feed bar clamp/unclamp and lift-down device that can make the feed bar larger than conventional ones.

[Means for Solving the Problems] Therefore, in the present invention, the mechanism for lifting and lowering the feed bar is designed so that the stroke length during clamping/unclamping operations and the minimum internal width during clamping operations are not limited. Even if the minimum internal width dimension is maintained at the optimum dimension when the feed bar is clamped,
This is a clamp/unclamp mechanism that allows the stroke length to be made larger than before.

Specifically, a pair of movable bodies are provided in the unit case so as to be movable in the clamp/unclamp direction, and a spline shaft, which is rotated back and forth in conjunction with the vertical movement of the slide, is passed through the pair of movable bodies. a boss rotatably supported, meshing with the spline shaft, movable in the axial direction of the spline shaft, and having an eccentric pin at a position eccentric to the spline shaft, rotatably held on each movable body;
A feed bar holder connected to the eccentric pin of the boss via a link and holding a feed bar at the upper end is provided on each movable body so as to be movable up and down in the lift/down direction, and the vertical movement of the slide is controlled by the movement of either of the movable bodies on either side. In addition to providing a transmission mechanism for converting reciprocating movement, racks are provided on both movable bodies in directions facing each other and in the clamp/unclamp direction, and pinions meshing with the racks are separated in the clamp/unclamp direction. The pinion is rotatably provided in the unit case, and both pinions are connected through an even number of idle gears.
It is characterized by

[Operation] When the slide moves up and down, the spline shaft rotates back and forth in tandem with it. This causes the boss to also rotate back and forth, causing the feedback bar receiver connected to the eccentric pin via a link to move up and down, i.e., to be lifted down. At the same time, the up and down movement of the slide causes one of the moving bodies to move back and forth in the clamping/unclamping direction via the transmission mechanism. This movement then causes the other moving body to move towards or away from the one of the moving bodies via the rack, pinion and idle gear, i.e., to be clamped/unclamped.
Therefore, the pair of feed bars are operated in the clamp/unclamp and lift/unclamp modes.
It can be operated down.

At this time, the spline shaft is rotatably supported by passing through a pair of movable bodies, and a boss having an eccentric pin that engages with the spline shaft so as to be movable in the axial direction is rotatably held in each movable body. Considering only this lift-down mechanism, it is possible to bring both movable bodies closest to each other and separate them from each other within the range of the spline axis. There are no restrictions on the stroke or the minimum internal width during clamp operation. In other words, the clamping and unclamping operations are not limited by the lengths of the spline shaft portions 4a, 5a and the hollow shaft 6, unlike in the prior art.

In addition, when converting the vertical movement of the slide into reciprocating movement of one moving body and transmitting the movement of this moving body to the other moving body, a pinion that engages with racks provided oppositely from both moving bodies is used. Even if the minimum internal width dimension is maintained at the optimum dimension when the feed bar is clamped, the stroke length during clamping and unclamping can be increased. can.

This will be explained with reference to FIG. Fourth
FIG. 4B shows the conventional case, and FIG. 4A shows the case of the present invention.

In Fig. 4b, the minimum internal width of the movable bodies 11, 11 is T1, the length of the racks 8, 9 is L1, the movable bodies 11,
If each stroke of 11 is S1, then S1
≒T1/2. Here, since L1=T1, S1 is approximately 1/2 the length of the racks 8 and 9. In other words, from the state of the minimum internal width T1 where the centers of the racks 8 and 9 are engaged with the pinion 7, both moving bodies 11,
This is the distance until the racks 8 and 9 come off the pinion 7 when the rack 11 moves in the unclamping direction.

On the other hand, in FIG. 4a, the minimum internal width of the movable bodies 11, 11 is T, the distance between the centers of the pinions 33, 33 is l, the length of the racks 34, 34 is L, the movable body 1
Letting each stroke of 1 and 11 be S,
S≒(T+l)/2, L≒T. Therefore, T
= T1, it is clear that S>S1. In other words, pinion 3 is controlled by the idle gear.
3 and 33 are apart from each other, both moving bodies 11 and 1
When 1 moves in the unclamp direction, Rack 3
Since the distance until the pinions 4 and 34 come off the pinions 33 and 33 is increased by 1/2, the stroke can be made larger than in the conventional case.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIGS. 2 and 3 show the main parts of this embodiment.
However, although not shown in these figures, the first
As shown in the figure, the lift/down cam 22, lever 24, and rod 25 move the press slide 21 up and down.
and a transmission mechanism that converts the movement of the pinion 27 into reciprocating rotation via the rack 26, a clamping/unclamping cam 23, a lever 28, a rod 29, a rack 30, a pinion 31,
A transmission mechanism is provided for converting the reciprocating movement of the other moving body 11 via the crank pin 32 and connecting rod 20. Furthermore, a pair of movable bodies 11, 11 are provided within the unit case 3 so as to be movable in the clamping/unclamping direction.

Now, FIG. 2 shows only the right side with respect to the vertical center line, and a symmetrical structure is provided on the left side. However, the connecting rod 19 connects the other moving body 11 and the crank pin 32, and is not provided on the left side. In FIG. 2, a spline shaft 12 is provided passing through a pair of movable bodies 11, 11. Spline shaft 12
Both ends of the pinion 27 are rotatably supported by the unit case 3, and one end protruding from the unit case 3 is engaged with the internal teeth of the pinion 27. Therefore, the spline shaft 12 is reciprocated by 180 degrees in conjunction with the elevation and descent of the slide 21.

Further, each movable body 11 has the spline shaft 1
A boss 13 that is engaged with the spline shaft 2 and is movable in the axial direction of the spline shaft 12 is rotatably held.
Both ends of an eccentric pin 14 are fixed to the boss 13 at positions eccentric to the axis of the spline shaft 12. The eccentric pin 14 moves between directly below and above the spline shaft 12 as the rack 26 moves up and down.
Rotates 180° back and forth.

A feed bar holder 2 is connected to the eccentric pin 14 via a link 15, and is movable up and down on the movable body 11 and holds the feed bar 1 at its upper end. As shown in FIG. 3, the feed bar receiver 2 has a pin 16 for connecting with the link 15.
is provided in the guide portion, and when the feed bar receiver 2 moves up and down, the spline shaft 12
The window 2a is formed in a size that does not interfere with the window 2a.
The link 15 is formed in a half-moon shape so that it does not interfere with the spline shaft 12 when the feed bar receiver 2 is raised by rotation of the spline shaft 12, as shown by the dashed line in FIG.

Therefore, when the slide 21 moves up and down, the spline shaft 12 rotates back and forth. Then, the eccentric pin 14 reciprocates 180 degrees from directly below to above the spline shaft 12 via the boss 13, so that the link 1
5, the feed bar receiver 2 is raised and lowered. In other words, the feed bar receiver 2 and the feed bar 1 are
A lift-down operation is performed in which the slide 21 rises while descending and descends while the slide 21 ascends.

Furthermore, racks 34, 34 are provided on each movable body 11 so as to protrude in directions facing each other and slightly shifted from side to side (in a direction orthogonal to the plane of the paper in FIG. 2). Pinions 33, 33 are engaged with teeth provided on the lower surface of each rack 34, 34, respectively. An even number of idle gears 18, 18 have a predetermined distance between both pinions 33, 33 in the clamp/unclamp direction, and are smaller in diameter than the pinion 33 and longer than the distance between the racks 34, 34.
are connected via. The pinions 33, 33 and the idle gears 18, 18 are rotatably supported in the unit case 3 in parallel with each other.

Therefore, when the slide 21 moves up and down, the other movable body 11 reciprocates in the left-right direction in FIG. 2 via the connecting rod 19. Now, when the other moving body 11 moves to the left in FIG. 2, the other pinion 33 is rotated by the rack 34. When the other pinion 33 rotates, the one pinion 37 is connected to the other pinion 3 via the idle gears 18, 18.
3, one of the moving bodies 11 is moved to the right in FIG. 2 via the rack 34 that engages with it. Conversely, when the other moving body 11 moves to the right in FIG.
Moved to the left in the diagram. In other words, both moving bodies 11,
When the slide 21 rises, the slides 11 move toward each other to perform a clamping operation, and the slide 21
When they descend, they move away from each other and perform an unclamping operation.

At this time, since the idle gears 18, 18 are provided between the pinions 33, 33, that is, there is a gap between them, even if the minimum internal width dimension during clamping operation is maintained at the optimum dimension, both movable bodies 1
1 and 11 move in the direction of unclamping, and rack 3
The distance until the tips of the pinions 4 and 34 come off the pinions 33 and 33, that is, the stroke length can be increased. If it is necessary to further increase the distance between the pinions 33, 33, an even number of idle gears 18, 18 may be provided side by side.

Therefore, regarding the stroke of the clamp/unclamp operation between this embodiment and the conventional example, Fig. 4a,
Compare with b. FIG. 4a shows this embodiment, and FIG. 4b shows a conventional example.

In the present embodiment of FIG. 4a, the moving bodies 11, 1
1, the distance between the centers of the pinions 33, 33 is l, the length of the racks 34, 34 is L, and each stroke of the moving bodies 11, 11 is S, then S≒(T+l)/2 , L≈T.

On the other hand, in the conventional example shown in FIG. 4b, if the minimum internal width of the movable bodies 11, 11 is T1, the length of the racks 8, 9 is L1, and the stroke of each of the movable bodies 11, 11 is S1, then S1 ≒T1/2, L1≒T1.

Therefore, if T=T1, it is clear that S>S1. Therefore, if T=T1=minimum internal width of optimal dimension, S is about 1/2 with respect to S1.
can only be made larger.

[Effects of the invention] As described above, according to the invention, the feed bar clamping method can make the stroke length longer than before even when the minimum internal width is maintained at the optimum dimension when a pair of feed bars are clamped. Unclamping and lift-down equipment can be provided.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the main parts of a conventional press, FIG. 2 is a longitudinal sectional view showing the main parts of an embodiment of the present invention, FIG. Figures a and b are diagrams for comparing the effects of this embodiment and the conventional example. 1...Feed bar, 2...Feed bar receiver,
3...Unit case, 11...Moving object, 12...
... Spline shaft, 13 ... Boss, 14 ... Eccentric pin, 15 ... Link, 18 ... Idle gear, 2
1...Slide, 33...Pinion, 34...Rack.

Claims (1)

[Scope of Claim for Utility Model Registration] A pair of movable bodies are provided in a unit case so as to be movable in the clamping/unclamping direction, and a spline shaft that rotates back and forth in conjunction with the vertical movement of the slide is connected to the pair of movable bodies. A boss that is rotatably supported through the movable body, meshes with the spline shaft, is movable in the axial direction of the spline shaft, and has an eccentric pin at a position eccentric to the spline shaft is rotatably attached to each movable body. A feed bar receiver connected to the eccentric pin of the boss via a link and holding a feed bar at its upper end is provided on each movable body so as to be able to move up and down in the lift/down direction, and the up and down movement of the slide is controlled by the movement of either side of the slide. A transmission mechanism is provided to convert the moving body into reciprocating movement, and racks are provided on both moving bodies in opposing directions and in the clamping/unclamping direction, and pinions meshing with these racks are clamped/unclamped.
A clamp/unclamp and lift/down device for a feed bar, characterized in that the pinions are rotatably provided on the unit case and separated in the unclamping direction, and the two pinions are connected through an even number of idle gears.