JPH0144182Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clamp restraint device for ensuring the desired clamping operation in a transfer device.

A conventional example will be explained below based on FIGS. 1 and 2. Reference numeral 1 denotes a frame, and the frame 1 supports a pair of left and right moving tables 2a and 2b that are movable in a direction perpendicular to the workpiece transfer direction A. Reference numeral 3 denotes an elevating drive shaft that passes through the movable tables 2a and 2b in the direction of movement thereof and is rotatably supported by the frame 1. The length of the movable table moving area at both ends of the elevating drive shaft 3 becomes a spline shaft portion, and a pinion that engages with and moves with the movable tables 2a and 2b is spline-fitted to this spline shaft portion. . Reference numerals 4a and 4b are lifting rods equipped with racks that engage with the pinion;
a, 2b in the vertical direction. Reference numerals 5a and 5b designate lifting platforms disposed at the upper ends of the lifting rods 4a and 4b, and 6 a pinion provided at the end of the lifting drive shaft 3. Reference numeral 7 denotes a reversible mechanism for moving the movable platforms 2a, 2b toward and away from each other, and includes two pushing rods 8, 9 arranged parallel to each other and parallel to the lifting drive shaft 3; ，
Rack 1 provided between rods 8 and 9 between 9 and 9
0 and 11, one pushing rod 8 is directly connected to one moving table 2b by a pin 14, and the other pushing rod 9 is connected directly to one moving table 2a. It is connected via a reference carriage 15 and a pin 16. The pushing carriage 15 is connected to the pushing rod 9 via another connecting member 17, and is supported and guided by the frame 1 via a guide member 12. Further, a rack 18 is provided at one end of the other pushing rod 9, and this rack 18
A pinion 19 supported on the frame 1 side is engaged with the pinion 19 . 20 is another pinion provided coaxially with the pinion 19. 21 is the push rod 9
This is a cylinder device that urges the cylinder to the left in FIG. 1 via a pushing carriage 15.

The same structure (not shown) as described above is provided symmetrically in the workpiece transfer direction A, and feed bars 22a and 22b are provided between the corresponding lifting tables 5a and 5b in the workpiece transfer direction A. is supported by support rollers 23a and 23b so that it can move only in the workpiece transfer direction A. Sector gears 26 and 27 are respectively formed at the upper and lower ends of a lever 25 attached to the frame 1 side via a shaft 24 so as to be able to swing back and forth, and the upper sector gear 2
6 is meshed with the pinion 6, and a lower sector gear 27 is meshed with the lift rack shaft 28. Reference numeral 29 denotes a rack shaft for clamping, which meshes with the pinion 20.

Next, the operation of the above configuration will be explained. The imaginary line in FIG. 1 shows the workpiece being transported by an amount of X in the workpiece transfer direction A and being lowered to the maximum at this position, just before being placed on the lower die (not shown) of the press. In this state, the clamper is first released. First, the clamping rack shaft 2 is clamped by the cam mechanism.
9 is pulled back, and the pushing rod 9 is moved to the right in FIG. Then, the other pushing rod 8 is also moved to the left by the same amount via the pinion 13, causing the movable tables 2a and 2b to be separated from each other as shown by solid lines in FIG. 1, and the clamper to be separated from the workpiece. This allows the workpiece to be placed on the lower mold. Thereafter, while the press work is being performed on this processed product, the feed bar 22 is
a and 22b move back by an amount of X. In this state, the clamping rack shaft 29 advances via the cam mechanism, and the movable tables 2a, 2b advance a predetermined distance via the reversible mechanism 7, that is, to a position where the clamper can clamp the workpiece on the lower mold. , 1st
The state shown by the imaginary line in the figure is reached. In this state, the workpiece is clamped by a clamper. Thereafter, the lift rack shaft 28 is moved back a certain amount by the cam mechanism, thereby rotating the lifting drive shaft 3, and the lifting rods 4a and 4b are raised via the pinion and rack, and the feed bars 22a and 2b are kept constant. amount increases. Next, the feed bar 22 is controlled by the cam mechanism.
a and 22b move forward by an amount of This completes a predetermined number of press operations.

Such a conventional configuration has the following problems.

Γ As shown in the imaginary line in Figure 1, feed bar 2
2a and 22b are connected and the workpiece is clamped by the clamper, that is, the cam surface restraining force for the cam mechanism that pushes and pulls the clamping rack shaft 29 is generated by the cylinder device 2.
1, the structure is complicated, and maintenance is difficult because the carriage 15, guide member 12, etc. are forced into a narrow device.

Γ Because there are many built-in components such as the pushing carriage 15 and the guide member 12, it is not possible to lower the height of the clamp print device, which makes it difficult to use with transfer devices that require a low feed bar height. It is.

Because the Γ moment is generated, the carriage relationship must be made robust, and the device itself becomes larger.

An object of the present invention is to provide a clamp restraint device for a transfer device that can solve the above problems with a simple structure.

In order to achieve the above object, the clamp restraint device in the transfer device of the present invention is provided with a pair of moving tables that respectively support a pair of left and right feed bars, and a reversible mechanism that moves these moving tables toward and away from each other. The mechanism is composed of a pushing rod connected to one moving table, a pushing rod connected to the other moving table, and a pinion that simultaneously meshes with racks formed on these pushing rods, and is linked to a cam mechanism. A clamping rack shaft is provided, and this clamping rack shaft is interlocked with the other pushing rod, and a tensioning cylinder device is disposed laterally below the other pushing rod. The cylinder device is connected to the cylinder device by a chain whose direction is changed through a chain wheel disposed on the frame.

According to the structure of the present invention, by pulling the other pushing rod with a tensioning device through the chain, a cam surface restraining force can be applied to the cam mechanism that pushes and pulls the clamping rack shaft.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. In this embodiment, the same reference numerals as in the conventional example (FIGS. 1 and 2) indicate the same or almost the same configuration. In this example,
The guide member 12 and the pushing carriage 15 of the conventional example are omitted, and the other pushing rod 9 is connected to the moving platform 2a via the connecting plate 30 and the link 31.
is connected to. One end of a chain 32 is connected to the free end of the other pushing rod 9, and this chain 32 is connected to a chain ring 33 attached to the frame 1.
After being wound, the other end is interlocked with a cylinder device (an example of a tension device) 34 disposed laterally below the other pushing rod 9.

According to the above configuration, the conventional carriage etc. are omitted and the other pushing rod 9 is directly connected to the chain 3.
2, the cylinder device 34 can apply tension to the cam surface.

Γ In the solid line in FIG. 3, the cylinder device 34 is arranged horizontally, that is, above the bed upper surface _a1 , but this means that the cylinder device 34A is arranged vertically as shown in the imaginary line. It may be placed below ₂ . Thereby, the clamp lift device can be made more compact, that is, the height above the bed upper surface _a2 can be lowered, and height restrictions can be substantially eliminated.

According to the clamp restraint device in the transfer device of the present invention described above, the following effects can be expected.

Γ The restraining force when the feed bar is brought close and the clamper clamps the workpiece, that is, the cam surface restraining force on the cam mechanism that pushes and pulls the clamping rack shaft is applied to the tensioning force through the chain whose direction is changed by the chain ring. Therefore, even if the stroke in the width direction in which the feed bar approaches and separates is long, the cylinder device can be placed below the other pushing rod and housed in the frame of the transfer device, and the transfer The device can be configured compactly.

Γ The number of built-in items in the device can be reduced, and the height of the clamp lift device can therefore be reduced, which can easily be used in transfer devices that require a low feed bar height.

Since no Γ moment is generated, strength is not required and the entire device can be made smaller.

[Brief explanation of the drawing]

1 and 2 show a conventional example, FIG. 1 is a partially cutaway front view, FIG. 2 is a plan view of the main part, and FIGS. 3 and 4 show an embodiment of the present invention, FIG. 3 is a partially cutaway front view, and FIG. 4 is a plan view of the main part. 2a, 2b...Moving table, 7...Reversible mechanism, 8,
9...Pushing rod, 10,11...Rack, 1
3... Pinion, 19, 20... Pinion, 22
a, 22b...Feed bar, 29...Rack shaft for clamp, 30...Connecting plate, 31...Link,
32... Chain, 33... Chain ring, 34, 34A...
...Cylinder device (tension device).

Claims (1)

[Scope of utility model registration request] A pair of moving tables each supporting a pair of left and right feed bars is provided, a reversible mechanism is provided for moving these moving tables toward and away from each other, and a pushing rod connects this reversible mechanism to one moving table, and the other moving table is provided. It consists of a pushing rod that is connected to the pushing rod, and a pinion that simultaneously engages with the racks formed on these pushing rods.A clamping rack shaft that is linked to a cam mechanism is provided, and this clamping rack shaft is connected to the other pushing rod. A tension cylinder device is disposed laterally below the other pushing rod, and the direction of the other pushing rod and the cylinder device is changed via a chain wheel disposed on the frame. A clamp restraint device for a transfer device, characterized in that the clamp restraint device is connected by a chain.