JPH01228747A - Clamping device - Google Patents

Abstract

PURPOSE:To quickly perform a work machining operation by providing a means for quickly and easily clamping and holding a work to a table and removing it in the clamping device for clamping and holding the work to the table in a machine tool. CONSTITUTION:After a work is brought to an on-center position by a centering member 11 and placed on a table 1, a fluid pressure cylinder 5 is operated to move a cylinder rod 7 in the direction the work is pressed. Owing to this, a claw-extruding member 13 is moved together with the cylinder rod 7. Further, a conical surface 13a abuts on an incline part 15a of a clamping claw 15, and the clamping claw 15 is projected from a claw-guide against an energizing force of a claw-returning spring 17 by the conical surface claw 13a. And further, when the cylinder 7 is depressed, a flange part 13b of the claw-extruding member 13 is pressed against the upper end side of the claw-guide 9, thus the flange part and the claw-guide are moved in the direction the work is pressed, and the work W is pressed and held by the clamping claw 15.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application) The present invention relates to a clamp device, and more particularly to a clamp device for clamping and holding a workpiece placed on a processing table.

(Prior Art and its Problems) Conventionally, a workpiece is fixedly held on a table or the like of a machine tool by positioning it with a jig and then fastening it with bolts using a tool called a pine needle. For this reason, the work for fixing and holding the workpiece on the table and for taking out the workpiece from the table is complicated, and the work efficiency as a whole is poor.

(Object of the Invention) This invention was proposed in view of the drawbacks of the above-mentioned prior art, and it is possible to quickly and easily fix and hold a workpiece to a table surface and remove it, thereby speeding up the workpiece machining work as a whole. The purpose is to achieve this goal.

(Basic Structure of the Invention) The present invention has a basic structure for achieving the above object, in which the work to be fixed is housed in the claw guide when it is not being tightened, and when the work is being tightened, the tightening claw pushing member is moved. a clamping claw that is pushed out from the clamping claw to form an engaging portion for the object to be fixed; and a claw guide that stores the clamping claw when the clamping claw is not tightened and moves together with the claw pushing member after the clamping claw is pushed out. , a claw push-out member having a guide surface that converts a movement movement in a predetermined direction into a tightening claw push-out force, and an eight-fold mechanism that reciprocates the claw push-out member in a predetermined direction. .

(First Example) In the following example, a donut-shaped workpiece is used as a non-tightening object.

As shown in FIG. 1, a through hole 3 is formed in a predetermined position of the table 1, and a cylinder rod 7 of a fluid pressure air cylinder 5 is inserted and attached to the through hole 3. A pawl guide 9 is installed around the cylinder rod 7 so as to pass through the cylinder rod concentrically. This claw guide 9 is urged in a direction away from the table 1 surface by a spring 10 provided on a centering member 11 attached to the surface of the table 1 so as to surround the transmission hole 3.

The tip of the cylinder rod 7 has an inverted conical conical surface 13a as a guide surface for pushing out the tightening pawl, and a flange portion 13b at the upper end.
A claw push-out member 13 having the following is attached.

The pawl guide 9 accommodates a clamping pawl 15 that can protrude in the radial direction of the pawl guide. The tightening pawl 15 has an inclined portion 15a formed on the inside thereof with an inclination corresponding to the conical surface 13a of the pawl pushing member 13. A groove is formed in the circumferential direction on the outside of the claw guide 9 and the tightening claw 15, and a claw return spring such as a rubber band is provided in the groove to urge the tightening claw inward. 17 is attached. The tightening pawl 15 is accommodated in the pawl guide 9 by the biasing force of the pawl return spring 17.

Note that the tightening pawl 15 does not need to be entirely accommodated in the pawl guide 9, as shown in FIGS. 1(A) and 1(B).

The dimensions between the outer end faces of the claw pushing member 13, the claw guide 9, and the tightening claw 15 when stored in the claw guide 9 must be smaller than the inner diameter dimension of the workpiece W.

After the workpiece W is placed on the table 1 while being centered by the centering member 11, the fluid pressure cylinder 5 is operated to move the cylinder rod 7 in the workpiece pressing direction. Then, as shown in FIGS. 2(A) and 2(B), the claw pushing member 13 is pushed together with the cylinder rod 7,
Further, the conical surface 13a comes into contact with the inclined part 15a of the tightening claw 15,
The tightening claw 15 is returned to the spring 1 by the conical surface 13a.
7 and protrudes from the claw guide 9.

When the cylinder rod 7 is further pushed down, the flange portion 13b of the pawl push-out member 13 presses the upper end side of the pawl guide 9, and both move in the pressing direction to the third position.
As shown in the figure, the tightening claws 15 press and hold the workpiece W.

In addition, FIG. 4 is a perspective view showing the clamp device of the present invention in the case where the workpiece W is fastened and held obliquely to the table surface.

After machining the workpiece, when the fluid pressure cylinder is turned off, the cylinder rod 7 returns to its initial position and lifts the claw pushing member 13, and the claw guide 9 is lifted upward by the biasing force of the spring 1o.
The tightening pawl 15 is also accommodated in the pawl guide 9 by a pawl return spring 17. After this, the workpiece W is taken out.

(Second Embodiment) In the above embodiment, the tightening pawl 15 was arranged to move linearly in the radial direction of the pawl guide 9, but the present invention is not limited thereto; It goes without saying that the tightening pawl 75 may be attached to the pawl guide 90 so as to be biased and rotatable about the support shaft 78 as shown in FIGS. Inside 79 is a spring that biases the tightening claw 75 in the direction of housing it in the claw guide 90.

In addition, in the above description, ff1 of the claw pushing member 13
Although the itl source is a fluid pressure cylinder, the present invention is not limited to this, and it goes without saying that a solenoid or the like may also be used.

(Third Embodiment) In each of the above embodiments, the claw guides 9 and 90 were explained to protrude on both sides, but the present invention is not limited to this, and the embodiments shown in FIGS. 6(A) and 6(B) As shown in FIGS. 7(A) and 7(B), only one side of the workpiece may be fastened and held.

In the figure, 39 is a claw guide, 53 is a claw pushing member, 53a
is a guide surface, 55 is a tightening claw, 5th is a spring for returning the claw,
Reference numeral 391 is an engagement recess extending vertically at a predetermined position of the claw guide 39, into which an engagement convex portion 531 formed on the outside of the claw push-out member 53 is fitted.
This is a guide groove that is moved up and down by the operation of the cylinder 5 while preventing and regulating rotation in the horizontal direction.

In each of the above embodiments, the guide surface that generates the force for pushing out the clamping pawl is not limited to a conical surface (an inclined surface in the third embodiment), but may also be formed by a known means such as a grooved cam surface. Needless to say, it's a good thing.

(Effects of the Invention) According to the present invention, with a simple structure, a workpiece can be quickly and easily fastened and held on a table and released.

Note that the first and second embodiments are most effective when fastening and holding a donut-shaped workpiece to a table, but are not limited to this, and the workpiece may be held and fastened using conventional pine needles. It goes without saying that this method can be applied to all kinds of cases, that is, it can be used regardless of the shape of the workpiece.

[Brief explanation of the drawing]

741 (A) and (B) are the first clamp devices of the present invention.
FIG. FIGS. 2(A) and 2(B) are a front sectional view and a cross sectional view showing the operating state of the first embodiment. FIG. 3 is a front sectional view showing the operating state of the first embodiment. FIG. 4 is a perspective view of the first embodiment of this invention.FIG. 5(A)
(B) is a cross-sectional view showing a second embodiment of the invention. FIGS. 6(A) and 6(B) are a front sectional view and a transverse sectional view showing the third embodiment. FIGS. 7(A) and 7(B) are a front sectional view and a transverse sectional view showing the operating state of the third embodiment. 1...Table 5...Fluid pressure cylinder 7.
... Cylinder rod 9.39.90 ... Claw guide 13.53 ... Claw extrusion member 15.55.75 ... Tightening claw Patent applicant Tsudakoma Kogyo Co., Ltd. Patent application agent Patent attorney Sugawara Partial foil Figure 1 Figure 2 Figure 3 Figure 5 (A) (B) Figure 6 CB) (B)

Claims (1)

[Claims] When the workpiece to be fixed is not tightened, it is stored in the claw guide, and when tightened, it is pushed out from there as the tightening push-out member described later moves to form an engaging part for the fixed object. a clamping pawl that retracts the clamping pawl when not tightened; a pawl guide that moves together with the pawl pushing member after the clamping pawl is pushed out; and a pawl guide that converts movement in a predetermined direction into a clamping pawl pushing force. A clamp device comprising: a claw pushing member having a guide surface; and a moving mechanism that reciprocates the claw pushing member in a predetermined direction and applies a clamping force to the clamping claw when tightening a workpiece.