JPH042751Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an annular workpiece gripping jig that holds an annular workpiece and supplies it to a predetermined position in an automatic assembly line or the like.

(Prior art) As a means for holding an annular workpiece and feeding it to a predetermined position on an automatic assembly line, etc.
As an example, as shown in FIG. 6, an annular workpiece gripping jig is used.

The annular workpiece gripping jig shown in the figure has three holding holes 21 bored in a holding member 20 having a substantially cylindrical shape.
A substantially T-shaped holding pin 22 and a small spring 23 are inserted into each holding hole 21, and a rod 25 having a tapered surface 26 at its tip is inserted into the holding member 20 so as to be movable in the axial direction. Rod 25
The annular workpiece 15 is held by a holding pin 22 that protrudes as the rod 25 advances in the axial direction, and the holding of the annular workpiece by the holding pin 22 is released as the rod 25 retreats.

(Problems to be Solved by the Invention) The conventional annular workpiece gripping jig described above has a structure in which the holding pin 22 pressed against the tapered surface 26 holds the annular workpiece 15 as the rod 25 moves in the axial direction. Because of this, a space is required for the reciprocating stroke of the rod 25, and in order to absorb variations in the diameter of the annular workpiece 15, at least one of the holding pins 22 is provided with an elastic stretchable portion. special measures are required.

The present invention solves the above-mentioned problems, makes it possible to set the length of the tip part short, and provides a gripping jig for an annular workpiece that can absorb variations in the diameter of the annular workpiece and reliably hold it. The purpose is to present the structure.

(Means for Solving the Problems) In view of the above-mentioned problems, the present invention provides a camshaft having a substantially rod-like shape and provided with a ball-moving cam, which has a substantially cylindrical shape and has a ball-retaining hole bored in the axial direction. a rotary drive cam groove having a first inclined surface and a second inclined surface which are divided in the circumferential direction facing each other, are inclined in opposite directions with respect to the circumferential direction, and have different positions in the circumferential direction; A ball is inserted into the attached cam cylinder so as to be relatively rotatable but relatively immovable in the axial direction, and is in contact with the ball moving cam and moves in and out in the radial direction by rotation of the support shaft, and is arranged in the ball holding hole, The ball is covered with an elastic ring made of a rubber-like elastic material, and the camshaft is rotated relative to a rotational drive member having a substantially cylindrical shape and having a cam pin inserted into the rotation drive cam groove. The cam cylinder is inserted so as to be relatively rotatable and relatively movable in the axial direction, and further, the two members are spaced apart from each other between the support shaft and the rotary drive member. An annular work gripping jig is constructed by arranging a spring.

(Function) In the annular workpiece gripping jig configured as described above, when the cam shaft, the cam barrel, and the rotational drive member are moved relative to each other in the axial direction by pressing the spring, the cam pin attached to the cam barrel is rotated and driven. Rotation is applied to the cam barrel in contact with the side surface of the cam groove, and a ball-moving cam on the cam shaft moves the ball radially outward as the cam shaft and cam barrel rotate relative to each other, inflating the elastic ring to form an annular shape. Hold the workpiece.

(Embodiment) In the embodiment shown in FIG. 1, the cam groove 1 having a substantially rod shape and having a spherical moving cam 2 having a substantially elliptical cross-sectional shape as shown in detail in FIG. The cam shaft 1 is inserted into a cam cylinder 3 which has a ball holding hole 4 and a rotary drive cam groove 5 whose details are shown in FIG.
A retaining ring 6 for suppressing relative movement of the cam cylinder 3 in the axial direction is attached to the cam shaft 1 with the cam cylinder 3 in between,
The rotationally driven cam groove 5 of the cam cylinder 3 has a substantially cylindrical shape.
The cam cylinder 3 is inserted into the rotary drive member 7 attached with the cam pin 8 which is inserted into the rotary drive member 7 so as to be relatively rotatable and relatively movable in the axial direction, and the sliding key 9 prevents relative rotation between the cam shaft 1 and the rotary drive member 7. is placed on the camshaft 1, a spring 10 for separating the camshaft 1 and the rotational drive member 7 from each other is inserted between the two members 1 and 7, and a ball 11 is inserted into the ball holding hole 4 of the cam cylinder 3. An elastic band 12 made of a rubber-like elastic material is placed in contact with the surface of the ball-moving cam 2 of the camshaft 1, and is wrapped around the ball 11 while maintaining the tightness against the cam cylinder 3.

Rotation drive cam groove 5 attached to the circumferential surface of the cam cylinder 3
As shown in Figure 3, which is a developed view of one circumference (360 degrees) viewed from the outside in the radial direction, the A first inclined surface 13 and a second inclined surface 14 are formed which are inclined and have different positions in the circumferential direction.

In the above-mentioned embodiment, as shown in FIG. 3), relative rotation is caused between the cam cylinder 3, the rotational drive member 7, and the camshaft 1, and the ball moving cam 2 of the camshaft 1 moves the ball 11.
When the elastic band 12 is inflated halfway through the spring 10 and the spring 10 is then released, the cam pin 8 slides into contact with the first inclined surface 13 (see FIG. 3), and as shown in FIG. A ball moving cam 2 of a camshaft 1 inflates an elastic band 12 via a ball 11 to hold an annular workpiece 15.

After moving the annular workpiece 15 to a predetermined position, the elastic band 12 is
The holding of the annular workpiece 15 is released, and the gripping jig returns to the state shown in FIG.

In the illustrated embodiment, the spherical moving cam 2 of the camshaft 1 is formed in a substantially elliptical shape, and both inclined surfaces 13, 1 of the rotary drive cam groove 5 of the rotary drive member 7 are formed.
4 is formed into four parts on the circumference, and one part of the axial movement of the rotational drive member 7 with respect to the cam shaft 1 and the cam cylinder 3 is formed.
The annular workpiece 15 is held by the relative rotation of 90 degrees between the camshaft 1 and the cam cylinder 3 during reciprocation, and the next one
Although it is designed to be opened by relative rotation of 90 degrees during reciprocation, the ball moving cam 2 of the cam shaft 1 is rotated approximately 3
The annular workpiece 1 is formed into a rectangular shape, and the rotational drive cam groove 5 of the cam cylinder 3 is divided into six parts on the circumference so that the annular workpiece 1 is formed into a rectangular shape.
It is also possible to adopt a mode in which 5 is held and then opened with the subsequent relative rotation of 60 degrees.

(Effect of the invention) As described above, in the present invention, the gripping jig has a camshaft having a substantially rod shape and equipped with a ball moving cam, and a camshaft having a substantially cylindrical shape and facing the ball holding hole on the opposite side in the circumferential direction. The cam cylinder is provided with a rotary driving cam groove having inclined surfaces shown in FIGS. 1 and 2 that are inclined at different positions in the circumferential direction and opposite to each other in the circumferential direction. A ball inserted and supported by the ball moving cam is placed in the ball holding hole, and an elastic band made of a rubber-like elastic material covers the ball and has a substantially cylindrical shape, and is inserted into the rotary drive cam groove. The cam shaft is inserted into a rotational drive member provided with a cam pin so that the cam shaft is relatively non-rotatable and relatively movable in the axial direction, and the cam cylinder is inserted so that it is relatively rotatable and relatively movable in the axial direction, and further,
By having a configuration in which a spring is arranged between the camshaft and the rotary drive member to separate both members from each other, the camshaft and the cam barrel are moved by the axial movement of the rotary drive member relative to the camshaft and the cam barrel. During this time, relative rotation is generated, and the elastic band is inflated by the ball pushed by the ball moving cam of the camshaft and holds the annular workpiece, so that the annular workpiece is held stably and the annular workpiece holding mechanism is It can be placed at the tip of the gripping jig.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is a sectional view at the position indicated by the arrow - in Fig. 1, and Fig. 3 is a sectional view of the main parts of the embodiment. The developed view, FIGS. 4 and 5 are cross-sectional views showing the operating conditions of the same embodiment, and FIG. 6 is a cross-sectional view of an example of a gripping jig according to the prior art. 1...Cam shaft, 2...Ball moving cam, 3...Cam cylinder, 4...Ball holding hole, 5...Rotation drive cam groove, 6
... Retaining ring, 7 ... Rotation drive member, 8 ... Cam pin, 9 ... Sliding key, 10 ... Spring, 11
... Ball, 12 ... Elastic band, 13 ... First slope, 14 ... Second slope, 15 ... Annular workpiece, 20 ... Holding member, 21 ... Holding hole, 22 ...
...Retaining pin, 25...rod, 26...tapered surface.

Claims (1)

[Scope of utility model registration request] A cam shaft 1 having a substantially rod-like shape and having a ball moving cam 2 attached thereto; The camshaft 1 is provided with a rotary drive cam groove 5 having a first inclined surface 13 and a second inclined surface 14 which are inclined at different positions in the circumferential direction.
The cam cylinder 3 is inserted so as to be relatively rotatable and relatively immovable in the axial direction. A rotary drive member 7 inserted so as to be relatively movable in the direction and to allow the cam cylinder 3 to be relatively rotatable and relatively movable in the axial direction; the cam shaft 1 and the rotary drive member 7;
This annular work gripping jig has a spring 10 inserted between the balls, a ball 11 that is inserted into the ball holding hole 4 and comes into contact with the ball moving cam 2, and an elastic band 12 that covers the ball 11.