JPH0539779Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a clamp device for fixing a press mold etc. that is attached to the bed of a press machine.

[Conventional technology]

In a press machine, when fixing a lower mold of a press die or a lower frame of a die set on the bed of the press machine, a clamping device is known that uses a manually rotated cam or a clamp claw operated by a hydraulic cylinder to fix the lower die of the press mold or the lower frame of the die set on the bed of the press machine.

This known clamp device uses a hydraulic cylinder to drive a clamp pawl that swings about a horizontal axis, and the clamp pawl cannot be moved back and forth. Therefore, the tip of the clamp claw always protrudes from the front end of the main body of the clamp device.

Therefore, with the clamp claw loosened, it is necessary to insert the lower ridge of the mold or die set between the substrate and the lower part of the clamp claw, and then activate the hydraulic cylinder to press the tip of the clamp claw against the ridge. To remove it, do the opposite.

[The problem that the idea attempts to solve]

When attaching a mold or die set to the conventional clamping device as described above, it is necessary to insert the protrusion of the mold into the narrow gap between the substrate and the clamp claw, which can be difficult if the mold or die set is heavy. It will be a lot of work.

Furthermore, in the case of a manual type, each clamp claw must be operated separately, which is extremely time-consuming and inefficient.

As a clamping device that solves this problem, there is a device in which a clamp claw moves back and forth, as disclosed in Japanese Utility Model Application Publication No. 59-44628.

In the case of a hydraulic clamping device such as the one mentioned above, in which the clamping claw moves back and forth, the clamping claw is initially retracted, so when placing a mold etc. on the board, the clamping claw does not get in the way, which is an advantage. A large hydraulic cylinder is provided at the rear of the main body of the press, so when this is mounted on the base of the press, the hydraulic cylinder protrudes from both sides of the base and becomes a hindrance. There are also other problems, such as the need for a hydraulic circuit for the clamp claws.

The problem of this invention is to solve the above-mentioned problems of conventional clamping devices and to provide a clamping device in which the clamping claws arranged at the front and rear of the board can be operated by a single manual operation shaft. .

[Means to solve the problem]

In order to solve the above problems, this invention provides a pair of left and right guide members on the front and rear of the board, and a clamp claw that can move forward and backward and swing freely is fitted between each guide member, and A wedge-shaped reciprocating member is provided at the lower part, which pushes up the rear part of the clamp claw when moving forward toward the center of the board, and engages with the rear end engaging portion of the clamp claw when retreating, thereby retracting the clamp claw. At the same time, at the front end of this reciprocating member, a presser is attached to the front end engagement part of the clamp pawl by spring pressure to move the clamp pawl forward. The right male thread near one end of the operating shaft is engaged with the right female thread at the bottom of the reciprocating member near the one end, and the left male thread near the other end of the manual operating shaft is engaged with the left female thread at the bottom of the reciprocating member near the other end. A clamping device is provided that engages the screw.

[Effect]

Since this device has the above-mentioned configuration, when the advancing/retracting members on the front and rear of the board are retreating in opposite directions, the rear ends of both members engage with the rear end engaging portions of each clamp claw, and each clamp claw Since the claws are moved backward, the tips of the claws do not protrude beyond the facing surfaces of the front and rear guide members.

Further, at this time, the presser provided on each reciprocating member presses the front end engaging portion of the clamp claw with spring pressure to bring the tip of the clamp claw to the raised position.

Next, when the manual operation shaft is rotated in the clamping direction, the female screws engaged with the right male screw and the left male screw of this shaft move forward together with the advancing/retracting member in directions facing each other.

As each reciprocating member moves forward as described above, the presser also moves forward and presses the front end engaging portion of each clamp claw with its tip, so that each clamp claw also moves forward with its tip raised. When the clamp pawl moves forward to a certain position, the tip of the clamp protrudes from the front end of the constant length guide member and does not move forward any further.

If the manual operation shaft is continued to be rotated even after the clamp claw stops moving forward, the reciprocating member will move further forward, but the pusher cannot move forward any further, so it compresses the spring and retracts into the retractable member.

In addition, when each reciprocating member further moves forward with respect to each clamp claw that has stopped as described above, the rear end of each clamp claw is pushed up by the wedge action of the slanted upper surface, and at the same time, the tip of each clamp claw is pushed up against the mold, etc. It is crimped onto the protruding edge and pressed onto the substrate to fix it.

〔Example〕

In the illustrated embodiment, reference numeral 1 denotes a substrate such as the bed of a press machine, and a pair of left and right guide members 2 are fixed to the front and rear of the substrate 1 by bolts or the like. A guide portion 3 is formed between the members 2 and extends longitudinally in the front-rear direction.

A clamp pawl 5 having a rectangular cross section is fitted into each guide portion 3, and in FIGS. 1 and 2, the opposite side of each clamp pawl 5 is the front part, and the opposite side is the rear part.
Reference numeral 6 denotes a horizontal shaft serving as a fulcrum, which traverses the guide 3 and passes through the clamp claw 5. Both ends of the horizontal shaft 6 pass through long holes 7 in the longitudinal direction provided in the guide members 2 on both sides of the guide portion 3. There is.

Therefore, the clamp claw 5 moves back and forth within a range where the horizontal shaft 6 touches the front and rear ends of the elongated hole 7, and swings about the horizontal shaft 6 as a fulcrum.

As shown in FIG. 1, a recess 10 is provided on the lower side from the horizontal axis attachment part to the rear end of each of the above-mentioned clamp claws 5, and the front end thereof is the front end engaging part 11, and the rear end thereof is the recess 10 that slopes upwardly. This is referred to as a rear end engaging portion 12.

Further, a hemispherical recess 1 is provided near the rear of the recess 10.
4, into which a spherical receiving piece 15 is rotatably fitted.

Reference numeral 16 denotes a wedge-shaped reciprocating member, and an upper surface 17 inclined forwardly and downwardly contacts the lower flat surface of the receiving piece 15 in a slidable manner.

The reciprocating member 16 is provided with a recessed hole 18 extending rearward from its front end, and the presser 20 is fitted into the recessed hole 18 so as to be freely retractable.
A coiled spring 21 is installed between the rear ends to press the presser 20 to the front end engaging portion 11.

Reference numeral 22 denotes a longitudinal groove provided in the substrate 1 so as to communicate with the guide part 3. As shown in FIG. communicates with a hole 19 passing through the substrate 1 in the front-rear direction, and the manual operating shaft 23 is rotatably fitted into this hole 19.

The upper side of the operating shaft 23 has a groove 2 as shown in FIG.
Right and left male threads 24 protruding into the inside of the operating shaft 23 and formed near both ends of the operating shaft 23 are engaged with female threads 24' formed on the lower surface of each reciprocating member 16.

The above female thread 24' is replaced by the male thread 2 as shown in Figure 3.
4, and the other part of the male thread 24 rotates within the hole 19.

The operating shaft 23 is movable in the axial direction, and as shown in FIG. , small diameter portion 2 of shaft 23
8 penetrates the hole of the receiving member 26 and protrudes to the outside, and its end forms a hexagonal or other square shaft portion 29 .

The other end of the operating shaft 23 is connected to a spring 32 in a concave hole of a receiving member 31 fixed to the other end surface of the board 1.
and is supported by a positioning ring 33.

In the above embodiment, FIG. 4 shows the clamp claw 5.
This indicates the retraction status of the advancing/retracting member 16.
is the retracted position.

The rear end of the member 16 in the retracted position pushes the rear end engaging part 12 of the claw 5 backward and is drawn into the tip guide part 3 of the claw 5, and the pusher 20 pushes the front end engaging part 12 of the claw 5 by the elasticity of the spring 21. Press 11 and tighten clamp claw 5
The tip of the is raised.

Therefore, the protruding edge 35 of the press mold etc. is the clamp claw 5.
It can be placed on the substrate 1 without being obstructed by.

Next, the square hole of the handle is fitted into the square shaft portion 29, and the operating shaft 23 is rotated in the clamping direction.

When the operating shaft 23 begins to rotate in the clamping direction in this manner, each reciprocating member 16 moves forward in the direction of the flange 35 through the engagement of each female screw 24' with the right-handed and left-handed male screws 24, but at the same time Since each presser 20 also moves forward and pushes the front end engaging portion 11, the advancing/retracting member 16,
The receiving piece 15 and the clamp claw 5 move forward while maintaining the relationship shown in FIG.

The horizontal shaft 6 that has moved forward together with the clamp claw 5 is connected to the elongated hole 7.
Even after the front end of the clamp claw 5 is reached and the forward movement of the clamp claw 5 stops, by further rotating the operation shaft 23, each reciprocating member 16 continues to move forward, and its slanted upper surface 17 pushes up the receiving piece 15, so that the clamp claw 5 The rear end is pushed up and its tip forms a protrusion 35 as shown in Figure 1.
Press it onto the substrate 1.

During the above tightening, if the tip of one clamp claw 5 is crimped to the flange 35 but the tip of the other clamp claw 5 is not yet crimped to the flange 35,
When the operating shaft 23 is further turned in the same direction, the operating shaft 23
moves in the axial direction, and the tip of the other clamp claw 5 is also pressed against the protrusion 35.

Further, when the operating shaft 23 is rotated in the opposite direction from the clamped state shown in FIG. 1, the reciprocating member 16 starts to move backward in the opposite direction.

At this time, the presser 20 that was compressing the spring 21 as shown in FIG.
Since it is crimped onto the member 16 and comes out from the member 16, the member 1
6 moves back and the lower part of the upper surface 17 of the member 16 moves to the receiving piece 15, so the clamp claw 5 rotates around the horizontal shaft 6 and raises its tip.
Release the clamp on the flange 35.

When the clamp is released as described above, the rear end of the reciprocating member 16 engages with the rear end engaging portion 12 of the clamp claw 5, causing the clamp claw 5 to move back together.
The original state shown in FIG. 4 is restored.

[Effect of idea]

As mentioned above, this idea is that before clamping, the front part of each clamp claw retracts from the front end of each guide member, or is in the same position as the front end of each guide member, so the press mold etc. will not be interfered with by the clamp claws. Since it is placed on the substrate, it is easy to attach and detach press molds, etc.

In addition, with this invention, the front and rear clamp claws on the board can be moved forward and backward, and tightened or released by simply rotating one manual operation shaft, so there is no need for a hydraulic cylinder, and unlike the hydraulic cylinder type, there is no possibility of hydraulic leakage. There is no risk of natural release of the clamp.

Furthermore, in the case of this device, the right and left male threads of the manual operating shaft move the wedge-shaped reciprocating member forward in the opposite direction via the female thread to tighten the clamp claw, so the action of the screw jack and the action of the wedge are combined. This has the effect of providing extremely strong tightening force with a small amount of force.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway longitudinal side view showing an embodiment of the clamp device of this invention, Fig. 2 is a partially cutaway plan view of the same, Fig. 3 is a longitudinal sectional rear view along the line of Fig. 1, and Fig. 4 The figure is a longitudinal side view when the clamp claw is retracted. DESCRIPTION OF SYMBOLS 1... Board, 2... Guide member, 3... Guide part, 5... Clamp claw, 11... Front end engaging part, 1
2... Rear end engaging portion, 15... Receiving piece, 16... Advance/retreat member, 17... Upper surface, 20... Presser, 21...
Spring, 23...Manual operation shaft, 24...Male thread, 2
4'...Female thread.

Claims (1)

[Scope of utility model registration request] A pair of left and right guide members are provided at the front and rear of the board, and a clamp claw that can move forward and backward and swing is fitted between each guide member, and a clamp claw that moves forward and backward toward the center of the board is provided at the lower part between the guide members. A wedge-shaped reciprocating member is provided that pushes up the rear part of the clamp pawl when moving up, and engages with the rear end engaging portion of the clamp pawl when retracting to retract the clamp pawl. A presser is attached to the front end engaging part of the board by spring pressure to move the clamp claw forward, and the right-hand male screw near one end of the manual operation shaft rotatably mounted inside the board is attached to the front end of the manual operation shaft. Engage with the right female screw at the bottom of the advancing/retracting member,
A clamping device in which a left male thread near the other end of the manual operation shaft is engaged with a left female thread at the bottom of the reciprocating member near the other end.