JPH0111365Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a chuck used in machine tools, etc., and in particular, a chuck that can detect the movement of a pawl, that is, a chuck that moves in the radial direction on the body, and detects at what position on the body the pawl stops. The present invention relates to a chuck equipped with a detection device capable of detecting whether the chuck is moving or where it is moving.

If such a check is used, clamping or unclamping of a workpiece can be remotely confirmed, which is highly effective in automating operation.

As a structure for achieving this, the following embodiments can be considered. One is equipped with a detection device that can detect the movement of the claw directly from the claw, and the other is indirectly detected through a member that moves the claw (for example, the movement of a plunger that moves the claw, Alternatively, it is conceivable to include a detection device capable of detecting the movement of a piston as a pressing means for moving a plunger.

A specific example of the former will be described with reference to the drawings. Figure 1 is a front view of the chuck of this example, Figure 2 is a front view of the chuck of this example;
The figure is the same side view, and the third item is the same perspective view.

In the figure, each of the main pawls 12 is fitted into a radial dovetail groove 11 (three shown) cut into the body 10, and a T-nut 23 is inserted into the groove 30 of the main pawl 12. The auxiliary pawl 14 is bolted and integrally constructed.

Thus, the main pawl 12 is forcibly moved outward or inward from the body 10 by the actuation force from the actuation force generating means, which will not be described. Therefore, the auxiliary claw 14 integrated with the body 10 similarly moves outward or inward of the body 10, and this movement allows the workpiece to be clamped or unclamped. It is.

On the other hand, a detection ring 21 having a larger diameter than the stepped portion is inserted into the stepped portion a of the body 10, and the amount of protrusion of a plurality of (six in the figure) parts 32 can be increased or decreased using push screws 33, respectively. Accordingly, the structure is such that the gap between the stepped portion a and the detection ring 21 can be adjusted to be uniform. On the other hand, the dovetail groove 11
A detection rod 15 is provided on the back surface of the main pawl 12 at the bottom of each groove, and is loosely inserted into a hole opened in the same direction as the axis of the body 10 and slides under the force of a spring 34. A steel ball 35 is held and attached to its tip so as to move along the slope of a certain slope b. The detection rod 15 and the detection ring 21 are integrated and shared by the interposition of a block 16 whose one end is loosely fitted into the small-diameter step at the approximate center of the detection rod 15 and whose other end is bolted to the detection ring 21. It has been made to move.

This will be further explained using FIGS. 4 to 6, which are enlarged views of the detection section. The outer periphery of the detection ring 21 is formed into a concave shape with a small diameter at the center, and detectors 50 and 51 (proximity switches shown) are disposed corresponding to the large diameter portions at both ends. Since the detectors 50 and 51 are bolted to the outer cylinder 36 that penetrates the outer periphery of the body 10 via the adjustment plate 52, the position of the elongated hole 53 of the adjustment plate 52 can be adjusted as appropriate. The structure is such that the relative positions of the detectors 50, 51 and the detection ring 21 can be changed.

Next, the operation of this chuck will be explained.

FIG. 5 shows an unclamped state in which no workpiece is gripped, and in this state, the detection rod 15 resists the pressing force of the spring 34 and compresses the spring 34. . This compressive force is obtained by the wedge action of the inclined surface b of the main pawl 12. Further, the detector 51 is in an ON state, but the detector 50 is in an OFF state.

However, if the above condition occurs, a signal enabling clamping is input to the work feed device, and the work is operated to feed the work to the chuck. The supplied workpiece is gripped by the inward movement of the auxiliary claw, and at the same time as this inward movement, the detection rod 15 is moved by the spring 3
4, along the inclined surface b toward the workpiece side in the same direction as the axis of the body 10,
The detector 51 is turned off and the detector 50 is turned on to detect that the workpiece is completely clamped. Machining of the workpiece is then started.

In this example, there are two sets of detectors, but there are three or more sets of detectors, and the combination of ON and OFF signals can be freely combined according to the purpose. In short, it is sufficient to detect the position of the auxiliary claw, and the detector is not specified.

With the chuck structure as described above, since the detection device is provided on the outer periphery of the body, the thickness of the chuck can be reduced, inspection from the outside can be easily performed, maintenance can be easily performed, and adjustment can be easily performed. It is effective as follows.

[Brief explanation of the drawing]

FIG. 1 is a front view of the embodiment, FIG. 2 is a side sectional view, and FIG. 3 is a perspective view of each component. 4th~
FIG. 6 is an enlarged view of the detection device, FIG. 4 is a front view, FIG. 5 is a side view, and FIG. 6 is a plan view. 10...Body, 21...Detection ring, 12...
...Main claw, 36...Outer cylinder, 14...Auxiliary claw, 50...
...Detector, 15...Detection rod, 51...Detector, 1
6...Block, a...Stepped portion, b...Slanted surface.

Claims (1)

[Scope of utility model registration request] It consists of a body, a pawl that moves radially outward or inward while being guided by a dovetail groove of the body, and an actuating means for actuating the pawl, and further includes an inclined surface provided on the back surface of the pawl and a pawl that moves radially outward or inward. a detection rod that moves together in the axial direction of the body while interlocking with the movement of the claw along the inclination of the inclined surface; an annular detection ring that is provided on the outer periphery of the body and is movable in the axial direction; It consists of a block for synchronizing the movement of the detection ring with the movement of the detection rod, an outer cylinder that covers the detection ring, and a detector provided on the outer cylinder and in association with the detection ring. A chuck with a claw movement detection device consisting of a detection device and a detection device.