JPS601853Y2 - press clamping device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a clamp device used when fastening a mold, jig, workpiece, etc. to a press slide, bolster, etc.

Conventionally, there are various configurations of this type of clamp device, but among them, a claw is provided on the clamp shaft that protrudes from the piston of the cylinder, a spiral groove is provided in the middle of the clamp shaft, and a spiral groove is formed on the head of the cylinder. There is known a structure in which a protruding pin is provided in a protruding manner, and the clamp shaft is rotated and moved forward and backward in accordance with the forward and backward movement of the piston, so that the pawl is pressed against or separated from the object to be clamped.

However, since this type of device operates on one side, the clamp shaft receives a bending moment, frictional resistance occurs in the groove and pin, and a large load is placed on them.The groove and pin are easily worn or damaged, and the There was a problem with sexuality.

This invention improves the above-mentioned cylinder-type clamp shaft device, increases the contact area, reduces frictional resistance, and configures the mechanism for converting linear motion into rotational motion so that it can operate on both sides. This solves the shortcomings of

Therefore, an embodiment according to this invention will be explained in detail with reference to the drawings.A cylinder 1 is fixed to the upper surface of a slide 11 of a press, and a clamp shaft 3 is attached to the lower surface of a piston 2 of the cylinder 1 and is integrated with the piston 2. The clamp shaft 3 is provided in a protruding manner, and its shaft 3 is passed through the slide 11. A claw piece 4 is fitted into the distal end of the clamp shaft 3 through which the clamp shaft 3 passes, and is fastened with a tightening nut 5 while maintaining a predetermined protruding direction.

On the other hand, a guide shaft 6 is provided integrally with the piston 2 on the upper surface of the piston 2, and a flat plate portion 7 is provided at the tip of the guide shaft 6.
, and the flat plate portion 7 is twisted spirally.

Further, a pair of rollers 8, 8, which sandwich the flat plate part 7 from both sides, are supported at the end of the cylinder 1 on the side where the guide shaft protrudes.

The cylinder 1 has a piston 2 which is raised upward in the figure by hydraulic pressure and lowered by a spring 9. A thrust bearing 1 is installed between the piston 2 and the spring 9.
0 intervenes to prevent the spring 9 from rotating.

Further, a cylinder may be used to raise and lower the piston 2 using hydraulic or pneumatic pressure, but in this case, the flat plate portion 7 of the guide shaft 6 is formed so as not to be thrust into the cylinder even if the piston 2 descends to the bottom dead center. There is a need to.

This device has the above-described structure, and in the illustrated state, the die 12 is fastened to the slide 11. When releasing this, the compressed spring 9 is removed by removing the rising pressure of the piston 2. The piston 2 is lowered by the repulsive force.

At this time of descent, the flat plate part 7, which is twisted, is connected to a pair of rollers 8,
8, the piston 2, guide shaft 6, and clamp shaft 3 are rotated as they descend.

Therefore, the claw piece 4 descends while rotating and separates from the die 12.

Next, when fastening the die 12, slide the die 12 into the
When the cylinder 1 is driven and the piston 2 is raised as shown in the figure while being held in pressure contact with the piston 1, the piston 2, the guide shaft 6, and the clamp shaft 3 rise while rotating in the opposite direction to the above-mentioned direction.
The claw piece 4 presses against the die 12 and fastens the die 12 to the slide 11.

As described above, the clamping device according to this invention has a spirally twisted flat plate part in the guide groove protruding from the piston, and is configured to be sandwiched between rollers from both sides of the flat plate part. The contact area of the mechanism that converts motion into rotational motion is carried out on the ridges of the flat plate portion, so there is no fear of wear or breakage as with conventional mechanisms, and durability can be greatly improved.

Furthermore, since the rollers are pressed against each other from both sides, both sides operate, and there is no fear of bending moment acting on the guide shaft, allowing smooth rotation.

Furthermore, since no grooves or the like are provided on the shaft, the diameter can be made thinner and the shaft can be made more compact.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a press clamping device according to this invention, FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line B-B in FIG. FIG. 4 is a perspective view showing the flat plate portion. 1...Cylinder, 2...Zeston, 3
... Clamp shaft, 4 ... Claw piece, 5 ...
...Tightening nut, 6...Guide shaft, 7...
...Flat plate part, buttock...Roller, 9...
Spring, 10... Thrust bearing.

Claims (1)

[Scope of utility model registration request] Piston 2 of cinder 1 fixed in place on the press
A clamp shaft 3 is provided on one side and a guide shaft 6 is provided on the other side, respectively.
A claw piece 4 is provided at the tip of the clamp shaft 3, a flat plate portion 7 is provided at the tip of the guide shaft 6, and the flat plate portion 7 is twisted spirally, and the end of the cylinder 1 on the protruding side of the guide shaft is provided with a flat plate portion 7. A clamping device for a press, comprising rollers 8, 8 that sandwich a flat plate portion 7 of a guide shaft 6 from both sides.