JPS618254A - Check - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a chuck for gripping a workpiece in an automatic production machine.

Conventional Structure and Problems When gripping a small, lightweight, and thin workpiece as shown in FIG. 1 using a small diameter hole, a chuck as shown in FIG. 2 has conventionally been used. This is to move the piston 1 up and down.] Pawls (right) 2 and 2 Vane pawls (left) 3 are rotated around a fulcrum pin 4 to grip the workpiece.

However, with the above configuration, even if there is a limit to the size of the chuck itself, it cannot be made smaller beyond a certain level. All you need is a minimum amount of space for the spring 5.
The length of the claw (right) 2 and the claw (left) 3 in the width direction is half the length of the fulcrum pin 4, so if they are made smaller, looseness tends to occur.

In addition, the shape of the claws is complicated and processing costs are high.

purpose of invention The present invention solves the above two conventional drawbacks.

Structure of the invention: an O-ring, a fulcrum pin, a piston with a V-shaped tip, a groove into which the O-ring is fitted, and a hole for the fulcrum pin;
It has a conical part into which the V at the tip of the piston enters, and a tip part that grips the target workpiece, a set of chuck claws split in half along the center line, and three pages that support the above-mentioned fulcrum pin, piston, and chuck claw. It consists of a holder that allows the chuck itself to be made smaller.

Description of examples An embodiment of the present invention will be described below with reference to FIG.

In Fig. 3, 6 is an O-ring, 7 is a fulcrum pin, 8 is a piston, 9 is a round chuck claw that was later divided into two along the center line, 1o is a holder that supports the above parts, and 11 (d
: A compression spring for pushing up the piston 8, and 12 a cover with an air hole.

The operation of the chuck configured as described above-1- will be explained below.

First, the chuck claw 9 is split into two halves, and the fulcrum pin 7 is sandwiched between the chuck claws 9 and the force of the O-ring 6 to keep the tip of the chuck claw 9 open at all times. The piston 8 also has a compression spring 11
is constantly pushed upward by the force of Next, when compressed air is supplied from the air hole of the cover 12, the piston 8
lowers and opens the chuck claw 9 with its V-shaped wedge surface. That is, the tip of the chuck claw 9 closes to release the workpiece. When the supply of compressed air is stopped, the piston 8 returns upward by the force of the compression spring 11, and the chuck claw 9 opens its tip by the force of the O-ring 6 and grips the workpiece.

As described above, in this embodiment, in order to obtain the opening force of the chuck claw, an O-ring is used instead of a compression spring to reduce the size of the chuck in the lateral direction (direction perpendicular to the fulcrum bottle). By splitting it into pieces, the length of contact with the fulcrum pin is made relatively long, and by applying preload with an O-ring, the occurrence of backlash is minimized, and the size of the chuck in the width direction (the fulcrum pin axis direction) is increased. The overall size of the chuck can be reduced to less than half of the conventional size. Furthermore, since most of the parts are round (can be machined on a lathe), manufacturing costs can be reduced.

As described above, the present invention has a configuration in which the chuck claw, which is divided into two parts by an O-ring, is sandwiched through the fulcrum pin, thereby making it possible to make the chuck smaller than the conventional inner diameter chuck. If the size of the machine is restricted by the conditions of the machine, etc., the effect will be significant.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an example of the shape of a workpiece to be gripped, FIG. 2 is a sectional view of a conventional chuck, and FIG. 3 is a sectional view of a chuck in an embodiment of the present invention. 6...0 ring, 7...fulcrum pin, 8
...Piston, 9...Chuck claw,
1o...Holder. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] An O-ring, a fulcrum pin, a piston whose tip has a V-shaped cross-sectional shape, a groove into which the O-ring is fitted, a hole for the fulcrum pin, a conical portion into which the V at the tip of the piston fits, and a tip that grips the target workpiece. A chuck comprising a set of chuck claws divided into two along the center line, and a holder that supports the fulcrum pin, piston, and chuck claw.