GB2088262A

GB2088262A - Securing dies on a die mount of a press

Info

Publication number: GB2088262A
Application number: GB8134179A
Authority: GB
Original assignee: TEIKOKU CHUCK CO; Teikoku Chuck Co Ltd
Current assignee: TEIKOKU CHUCK CO; Teikoku Chuck Co Ltd
Priority date: 1980-11-22
Filing date: 1981-11-12
Publication date: 1982-06-09
Also published as: DE3146108A1; JPS595373B2; DE3146108C2; JPS5788922A; GB2088262B

Abstract

A device comprises first clamps (6) and second clamps (7), tiltably mounted on a die mount (1), and each formed with a shoulder (8) at each side thereof, a projection (11, 14) at one side of the bottom, and an opening (10, 13), and each provided with a spring (12, 15) at the other side of the bottom. The opening (10) in each first clamp (6) is circular, whilst the opening (13) in each second clamp (7) is trapezoidal. A camshaft (16) extends through the openings in the first and second clamps, and is formed with a plurality of enlarged portions (17) received in the openings (10) in the first clamps (6) and a plurality of spiral cams (18) received in the openings (13) in the second clamps (7). In operation, dies (20) are placed between the rows of clamps, and the shoulders (21) of the dies (20) are secured by the shoulders (8) of the clamps against the die mount when the camshaft (16) is turned to tilt the first and second clamps (6,7), respectively, in opposite directions. <IMAGE>

Description

SPECIFICATION Device for securing dies The present invention relates to a device for securing a plurality of dies to the die mount on the bed and ram of a press such as a transfer press.

It has been a common practice to secure a large number of dies to the surface of the die mount one by one, which entailed much labor and time.

It is an object of the present invention to eliminate and solve the above-described disadvantage.

According to the present invention, a plurality of clamps for clamping the dies are arranged in a plurality of rows on the surface of a die mount.

When a camshaft extending through the openings provided in the clamps is turned, the dies arranged at both sides of the clamps are securely clamped against the mount by the clamps.

In order that the present invention will be more clearly understood, reference will now be made to the accompanying drawings, in which:- Fig. 1 is a front view of a device embodying in the present invention; Fig. 2 is a sectional side elevation of a portion thereof; Figs. 3 and 4 are enlarged front views of two types of clamps; and Fig. 5 is a perspective view of a camshaft.

Referring to the drawings, a lower die mount 1 is secured to the bed of a press and an upper die mount 2 is secured to the underside of a ram of the press.

A pair of bearings 3 and 4 are bolted to the mount 1. A support shaft 5 has its front and rear ends fixed by the bearings 3 and 4 (Fig. 2). A plurality of clamps 6 and 7 are alternately mounted on the support shaft 5 so as to be slightly tiltable about the support shaft. (Figs. 3 and 4.) The clamps 6 and 7 have a shoulder 8 at their opposite sides.

The clamps 6 (Fig. 3) are formed with a round opening 10 above the hole for the support shaft 5 and with a projection 11 at their right side. They are provided with a spring 12 at their left side.

The other clamps 7 (Fig. 4) are formed with an opening 13 of a trapezoidal shape having an oblique surface 9 at its right side and formed with a projection 14 at their left side. They also are provided with a spring 1 5 at their right side.

A cam shaft 1 6 extends through the openings 10 of the clamps 6 and the openings 13 of the clamps 7. The openings 10 of the clamps 6 receive the enlarged portions 1 7 of the cam shaft and the openings 1 3 of the clamps 7 receive the spiral cams 18 thereof. The cam shaft 16 is formed with a square projection 19 or a square hole at its end for engagement with a handle for turning it. The enlarged portions 1 7 have a diameter equal to or larger than the maximum diameter of the spiral cam 1 8 so that the cam shaft 16 will pass easily through the clamps 6 and 7 in the assembly.

When the spiral cam 1 8 is in such a position as shown with a solid line in Fig. 4, the spring 1 5 urges the clamp 7 counterclockwise and presses its projection 14 against the lower die mount 1. In this condition, the distance between the shoulder 8 on the left side of the clamp 7 and the surface of the lower die mount 1 is equal to the distance between the shoulder 8 on its right side and the surface of the lower die mount 1. Also, the spring 1 2 urges the clamp 6 clockwise and presses its projection 11 against the lower die mount 1. In this condition, the distance between the shoulder 8 on the left side of the clamp 6 and the surface of the lower die mount 1 is equal to the distance between the shoulder 8 on its right side and the surface of the lower die mount 1.

After the clamps 6 and 7 have been placed in this condition, dies 20 are mounted between the rows of the clamps 6 and 7 in such a manner that flanges 21 at both sides of each die 20 are placed right beneath the shoulders 8 of each clamp. Then, knobs 22 are turned to raise knock pins (not shown) to position the dies 20. A handle is fitted on the square projection 1 9 on the camshaft 1 6 and is turned so as to turn the camshaft 1 6 counterclockwise in Fig. 4.

As the camshaft 1 6 is turned, the oblique surface 9 of the opening is pushed to the right by the cam 18 so that the clamp 7 will be tilted rightwardly around the support shaft 5. As a result, the flange 21 of the die 20 mounted on the right side of the clamp 7 is pressed against the lower die mount 1 by the shoulder 8 on the right side of the clamp 7 as shown with a chain line in Fig. 4.

While the camshaft 16 is further turned counterclockwise, since the clamp 7 cannot tilt further to the right, the camshaft 1 6 itself is moved to the left by reaction force. Consequently, the clamp 6 begins to tilt leftwardly around the support shaft 5 so that the flange 21 of the die 20 mounted on the left side of the clamp 6 is pressed against the lower die mount 1 by the shoulder 8 on the left side of the clamp 6 as shown with a chain line in Fig. 3.

Now the dies 20 are secured to the surface of the lower die mount 1 by means of the clamps 6 and 7, and the press is ready for operation.

In order to remove the dies 20 from the press after pressing, the camshaft 1 6 is turned to an opposite direction so as to allow the clamps 6 and 7 to go back to their initial positions by the springs 12 and 15, respectively.

The above-described procedure holds good for the mounting of dies 23 against the under surface of the upper die mount 2 by means of another set of clamps 6 and 7.

The device embodying the present invention has an advantage that all that one has to do to secure the dies 20 and 23 to the die mounts 1 and 2 is to turn the camshafts 1 6.

The device embodying the present invention has another advantage that the dimensional inaccuracy in the thickness of the flanges 21 and 24 is allowable to a certain extent because the structure of the device has the effect of equalizing the force exerted by the clamps 6 and 7 to the dies.

The device embodying the present invention has still another advantage that the dies 20 and 23 can be easily mounted on the surfaces of the die mounts because the clamps 6 and 7 arranged in a plurality of rows on the die mounts 1 and 2 serve as guides for the dies 20 and 23. The clamps 6 and 7 may be increased in number as desired.

While a preferred embodiment of the present invention has been disclosed, it is to be understood that it has been described by way of example only, and that various modifications may be made.

Claims

1. A device for securing dies on a die mount of a press or the like, said device comprising: a plurality of first clamps tiltably mounted on said die mount and formed with a shoulder at each side thereof, a projection at one side of the bottom, and a generally round opening, and provided with a spring at the other side of the bottom; a plurality of second clamps tiltably mounted on said die mount and formed with a shoulder at each side thereof, a projection at one side of the bottom, and an opening of generally trapezoidal shape, and provided with a spring at the other side of the bottom; and a camshaft extending through said first and second clamps and formed with a plurality of enlarged portions received in the openings of said first clamps and a plurality of generally spiral cams received in the opening of said second clamps; dies, in operation of the device, being placed between the rows of said first and second clamps and secured by said shoulders of said first and second clamps against the die mount when said camshaft is turned.

2. A device for securing dies on a die mount of a press or the like, substantially as hereinbefore described with reference to the accompanying drawings.

3. A press or the like provided with one or more devices as claimed in claim 1 or 2.