JPS6210021Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chuck unit that is highly versatile and can be used with a wide variety of objects regardless of the shape or size of the object.

Hitherto, there has been an oil chuck unit described in Japanese Utility Model Publication No. 32-3482 as a chuck unit that can handle objects of small diameter, large diameter, or irregular shapes. As shown in FIG. 4, this oil chuck has a chuck base 1 consisting of an upper plate 3, a lower plate 4, and a spacer 5 connecting these. Three dovetail grooves 25 directed toward the center are bored in the lower plate 3 as guide grooves, and a guide 18 is slidably guided in each of these dovetail grooves 25. A chuck claw 20 is fixed to each of the guides 18, and a chuck claw 20 is fixed to each of the guides 18.
8 are configured to move together as they move toward the center. Further, between the upper plate 3 and the lower plate 4, a cylinder body 9 constituting the cylinder mechanism 8 is provided.
The upper end of this cylinder body 9 is guided by the upper plate 3, and the lower part thereof is guided by a cover plate 26 fixed to the lower plate 4, so that it can be moved up and down. Moreover, this cylinder body 9 has a spring 2
7 toward the cover plate 26 side, and when oil is supplied into the cylinder body 9 from the first supply/discharge port 13 provided at the upper end of the cylinder body 9, the spring 2
It is configured to rise against 7. Further, a rotatable lever 28 is attached between the upper plate 3 and the lower plate 4, and one end of this lever 28 is connected to the cylinder body 9, and the other end is connected to the guide 18, so that the cylinder When the main body 9 rises, the lever 28 rotates to move the guide 18 along the dovetail groove 25.

The oil chuck described above can be used with any object, whether it is a small diameter object, a large diameter object, or an irregularly shaped object, but the chuck pawl 20 fits into the dovetail groove 25 and slides. guide 18
Because the guide 18 is fixed to the
Not only does the cylinder mechanism 8 for moving this guide 18 have to be large, but also the frictional resistance of the guide 18 sliding in the dovetail groove 25 is large, making it difficult for the chuck pawl 20 to move smoothly. However, there are disadvantages such as the inability to quickly clamp the object.

The present invention aims to eliminate the above-mentioned drawbacks, and examples thereof will be described below with reference to the drawings. In Figures 1 to 3, 1 is a check unit 2.
This desk is made up of a substantially equilateral triangular upper plate 3, a lower plate 4, and three spacers 5 connecting them. Three guide grooves 6a, 6b, 6c formed by two vertical walls are cut into the upper plate 3 and the lower plate 4 at opposing positions. A rod 7 is connected between the upper plate 3 and the lower plate 4, and this rod 7 passes through an upper rod guide 10 and a lower rod guide 11 fixed to the upper and lower parts of the cylinder main body 9, The body 9 is configured to slide along the rod 7. A piston 12 is fixed to the center of the rod 7, and the piston 12 is configured to be located within the cylinder body 9. Moreover, the cylinder main body 9 is provided with a first supply/discharge port 13 and a second supply/discharge port 14 at the upper and lower parts thereof, respectively. Air is supplied from the first supply/discharge port 13, and air is supplied to the second supply/discharge port When air is discharged from the port 14, the cylinder body 9 is configured to rise along the rod 7.

The cylinder body 9 has a substantially regular triangular prism shape, and has protrusions 15a, 15b, 1 on each side thereof.
5c is provided protrudingly. The protrusion (hereinafter referred to as 15)
(Explanation for a) 2 pieces each on the top and bottom 1
A pair of link plates 16a and 16b are rotatably connected by a pin 17. In addition, a guide 18 is pin-coupled to the other ends of the link plates 16a, 16b, and is guided by straddling guide grooves 6a located at opposing positions on the upper plate 3 and lower plate 4. 9. Two sets of link plates 16a, 16b and a guide 18 constitute a parallel link mechanism. Further, the upper plate 3 and the lower plate 4 are provided above and below the guide 18.
A set of two rollers 19a and 19b are attached to each roller so that they roll, and when the link plates 16a and 16b swing, the guide 18 is moved in parallel along the guide groove 6a. It is configured. Further, a chuck pawl 20 is attached to the lower end of the guide 18, and its gripping surface is configured to face the center of the chuck stand 1. The gripping surface of the chuck pawl 20 consists of a first step surface 21 and a second step surface 22, and a gripping pin 23 is inserted into the second step surface 22. This clamping pin 23 is fixed to a leaf spring 24 attached to the chuck claw 20, and the clamping pin 23 is always urged toward the center of the chuck stand 1.

In the chuck unit described above, the chuck stand 1 is lowered to a predetermined position by a separately installed lifting source (not shown), and the three chuck claws 20 in the open state are positioned on the outer periphery of the object (not shown). let At the same time, when air is supplied from the first supply/discharge port 13 of the cylinder mechanism 8 and air is discharged from the second supply/discharge port 14, the cylinder body 9 rises.
Along with this, link plates 16a, 16b
swings, and the cylinder body 9 side of the link plates 16a, 16b is pulled up. At this time, the guide 18 side of the link plates 16a and 16b is also pulled up, but the roller 19 attached to the guide 18
Since the guide 18 is prevented from rising by a and 19b, the link plates 16a and 16b are further pulled in the direction of inclination, and as the cylinder body 9 rises, the guide 18 is moved to the center of the bench 1. It is pulled toward the direction and moves smoothly along the guide groove 6a. Therefore, guide 1
The chuck claws 20 fixed to 8 move toward the object while maintaining parallel postures to each other, and grip the object from three directions.

As explained above, the present invention attaches the cylinder body to the chuck stand so that it can move up and down, and at the same time provides the chuck stand with a plurality of guide grooves extending toward the center above and below, and inserts the guide to which the chuck pawl is fixed into the guide groove. The cylinder main body, the guide, and two link plates connecting these are connected to form a parallel link mechanism, and the cylinder body is arranged so as to move astride the cylinder body, and the cylinder body and the guide are connected to form a parallel link mechanism, and the cylinder body and the guide are arranged so as to move astride each other. Since the guide is configured to move only in the horizontal direction by installing rollers that move the guide horizontally, the link plate fixed to the guide swings due to the movement of the cylinder, and the guide exerts no pressure or tensile force in the horizontal direction. When the guide receives a load, the roller rolls along the chuck base, and the guide only has frictional resistance between it and the vertical wall of the guide groove, and can move smoothly with little force. , it has advantages such as being able to quickly clamp the object.

[Brief explanation of the drawing]

Figure 1 is a front view of the present invention, Figure 2 is A of Figure 1.
-A sectional view, FIG. 3 is a sectional view taken along line B-B in FIG. 1, and FIG. 4 is a sectional view of main parts showing a conventional example. 1...Chickstand, 2...Chuck unit, 3...
Upper plate, 4... Lower plate, 5... Spacer, 6a, 6b, 6
c... Guide groove, 7... Rod, 8... Cylinder mechanism,
9...Cylinder body, 10...Upper rod guide, 11
...lower rod guide, 12...piston, 13...first
Supply/discharge port, 14...Second supply/discharge port, 15a, 15b, 1
5c...Protrusion, 16a, 16b...Link plate, 17...Pin, 18...Guide, 19a, 19b
...roller, 20...chuck claw, 21...first stage surface,
22... Second stage surface, 23... Holding pin, 24... Leaf spring, 25... Dovetail groove, 26... Cover plate, 27... Spring, 2
8...Lever.

Claims (1)

[Claims for Utility Model Registration] A cylinder in which a chuck pawl 20 that moves along a plurality of guide grooves 6a, 6b, 6c toward the center of the chuck stand 1 is disposed, and a cylinder body 9 is provided in the chuck stand 1. A mechanism 8 is provided, and the cylinder body 9 is moved by the operation of the cylinder mechanism 8, and the chuck pawls 20 can be moved toward the center all at once via a coupling mechanism by the movement of the cylinder body 9. In this chuck unit, the chuck stand 1 is composed of a rod 7 and an upper plate 3 and a lower plate 4 fixed to the rod 7 at a predetermined interval, and two pieces are installed at opposing positions on each of the upper plate 3 and the lower plate 4. Guide grooves 6a, 6b, 6c made of vertical walls are provided, and the guide grooves 6a, 6b, 6c of the upper plate 3 and the guide grooves 6a, 6a of the lower plate 4 located opposite thereto are provided.
6b and 6c, guides 18 are arranged so as to be guided by their legs, and a chuck pawl 20 is fixed to one end of each of the guides 18, while a piston 12 is fixed to the cylinder mechanism 8 at a predetermined position of the rod 7. The cylinder body 9 includes a piston 12, and a first supply/discharge port 13 and a second supply/discharge port 14 are formed in the cylinder body 9.
two link plates 16a extending parallel to 8;
16b to form a parallel link mechanism to hold the guides 18 parallel to each other, and rollers 19a and 19b that roll along the upper plate 3 and the lower plate 4, respectively, are attached to the guide 18. , the guide 1 is moved by the movement of the cylinder body 9.
8 is configured to move along guide grooves 6a, 6b, and 6c.