JPH0540909Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a workpiece fixing device for turning, etc.

[Conventional technology]

Fixtures used for turning automobile brake drums, etc. are used to secure the workpiece to the chuck by placing the workpiece on the abutment fixed to the chuck, placing the presser foot on top of the workpiece, and tightening the tightening nut. There is.

Further, Japanese Utility Model Publication No. 56-98540 describes a chuck structure in which a pin for holding down a workpiece is guided by a cam groove and rotated to clamp workpieces of different sizes from the outside or the inside.

[Problem that the invention attempts to solve]

The conventional fixing method requires a special tool to tighten the tightening nut in addition to manual attachment and removal of the presser foot, and the presser foot is heavy, reducing work efficiency, especially when the workpiece is large.

Furthermore, the method described in the above-mentioned publication is suitable for fixing a small workpiece from the outside or inside, but because the workpiece is fixed with several pins, it is not suitable for fixing a large workpiece. In addition, it cannot be used when fixing the end face of a workpiece.

The purpose of the present invention is to solve the above-mentioned problems and provide a workpiece fixing device that does not require special tools for attaching and detaching the workpiece, and that makes it easy to attach and detach even large workpieces. That is.

[Means and actions for solving problems]

The present invention consists of an abutment fixed to a tightening jig plate, a presser foot equipped with a guide pin guided in the radial direction by a guide member, and a presser foot plate equipped with a handle and a tightening wrench. In this workpiece fixing device, a guide pin of the presser foot is inserted into a cam groove provided in the presser plate, and a screw of a tightening wrench is screwed into a tightening jig plate.

When the handle is rotated, the presser foot moves in and out in the radial direction using guide pins and cam grooves, so with the presser foot retracted, place the workpiece on the abutment and rotate the presser plate using the handle. Then, the cam groove of the presser plate pushes the guide pin outward in the radial direction, and the presser foot is guided in the radial direction by the guide member and hangs on the end surface of the workpiece. In this state, turn the tightening wrench to tighten the presser plate to the tightening jig plate. The presser foot is pressed by a presser plate and presses and fixes the workpiece against the abutment.

To remove the workpiece, turn the tightening wrench to loosen the screw, then turn the handle in the opposite direction to retract the presser foot and remove the workpiece, leaving the presser plate etc. on the tightening jig plate.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a front view of the workpiece fixing device, and FIG. 2 is a sectional view taken along the line X--X in FIG. 1.

Reference numeral 1 denotes a tightening jig plate for attaching and turning a workpiece such as a brake drum of an automobile, and three abutments 2 on which a workpiece 10 is placed are fixed at equal angular intervals. A holding plate 5 that holds a tightening wrench 9 that is tightened and fixed to this tightening jig plate 1 with a screw 14 has three cam grooves 6 whose diameter increases in the radial direction.
and three circular arc grooves 7 are provided at equal angles on the outer side thereof.

A guide pin 4 is fixed to each of the three presser feet 3, and these guide pins 4 are guided in the radial direction by a guide fitting 12 fixed to the tightening jig plate 1, and The cam grooves 6 of the cam grooves 6 of the cam grooves 6 of the cam grooves 6 of FIG.

Further, the presser foot 3 has a radial straight groove 13 into which a pin 11 fixed to the tightening jig plate 1 is fitted.
is provided, and this pin 11 is fitted into the arcuate groove 7 of the presser plate 5. A handle 8 is fixed to the center of the holding plate 5, but the upper part is bent into a dogleg shape in order to avoid the tightening wrench 9 disposed at the center.

Next, the operation of this device will be explained.

A tightening wrench 9 is attached to the tightening jig plate 1 with a screw 14, and when the handle 8 is rotated counterclockwise in FIG.
is drawn in toward the center, and the workpiece 10 is placed on the abutment 2 through the outer periphery of the presser foot 3 from above as shown in FIG.

When the handle 8 is rotated clockwise, the presser plate 5 also rotates, and its cam groove 6 moves the guide pin 4 in the direction of increasing the diameter, and the presser foot 3 moves in the straight line fitted into the pin 11. It is guided by the groove 13, extends in the radial direction, and hangs over the end surface of the workpiece 10. In this case,
The presser foot 3 is guided so that the guide pin 4 is a guide fitting 12 and the linear groove 13 is moved by a pin 11 in a radial direction. The pin 11 is attached to the presser plate 5
It also fits into the arcuate groove 7 and serves as a guide.

At this time, the amount of overhang of the presser foot 3 in the radial direction is
It is regulated by a cam groove 6 provided in the presser foot plate 5, so by adjusting the amount of rotation of the presser foot plate 5, the presser foot 3
The length of contact with the workpiece 10 can be adjusted as appropriate.

In this state, when the tightening wrench 9 is turned to tighten the screw 14, the presser foot 3 is pressed by the presser plate 5, and the workpiece 10 is pressed and fixed against the abutment 2.

When the workpiece 10 is to be removed after the workpiece 10 has been processed, the tightening wrench 9 is turned in the opposite direction to loosen the screw 14, the pressure on the presser plate 5 is released, and the handle 8 is turned counterclockwise. Presser foot 3 is pin 1
1 and the linear groove 13, and the guide pin 4 is pulled toward the center by the cam groove 6 while along the guide fitting 12, so that it comes off from the end face of the workpiece 10, and the workpiece 10 can be removed.

Therefore, when installing or removing a workpiece,
There is no need to manually connect and disconnect the presser foot to the workpiece, and the workpiece is tightened and fixed via the presser foot using a tightening wrench attached to the presser plate, so special tools are not required. You can get away without it.

[Effect of the invention]

This invention moves the presser foot forward and backward by rotating the presser plate,
Since the workpiece is clamped and fixed via the presser foot by tightening the presser plate, there is no need to manually connect and disconnect the presser foot to the workpiece, which simplifies workpiece attachment and detachment work and reduces work time. , it becomes possible to firmly fix the end face of the workpiece.

Furthermore, even if the workpieces have different dimensions, they can be reliably and firmly attached by adjusting the amount of radial overhang of the presser foot.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line X--X in FIG. 1. 1...Tightening jig plate, 2...Abutment, 3...
...Presser foot, 4...Guide pin, 5...Press plate, 6
...Cam groove, 7...Circular groove, 8...Handle, 9...
Tightening wrench.

Claims (1)

[Scope of utility model registration request] The tightening jig consists of an abutment fixed to the plate, a presser foot provided with a guide pin guided in the radial direction by a guide member, and a presser plate equipped with a handle and a tightening wrench, and A workpiece fixing device characterized in that a guide pin of the presser foot is inserted into the cam groove, and a screw of a tightening wrench is screwed into a tightening jig plate.