JPH11262885A - Fluid pressure holding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a link mechanism and a holding device main body in a device in which a moving distance of a master jaw is long and make weight of the main body light by forming a link which is rotatably mounted on a rotating plate arranged on a concentric circle with a main body center into a bent shape. SOLUTION: When fluid pressure is applied to a first pressure chamber 15a of a piston 4, the piston 4 starts to move in a main body center direction and a piston lot 5 fixed to the piston 4 and a connecting block 6 start to move by following the piston 4. Also a bent-shaped link 8 mounted on the connecting block 6 moves in the main body center direction and the other mounted on a rotating plate 9 by a fulcrum pin 14 starts to move on a concentric circle with the main body center. As a result, because the link 8 is bent even if an oscillating angle of the link 8 with a motion direction of the piston 4 becomes a maximum angle, the oscillating angle can be suppressed to a smaller degree as compared with a conventional link system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid pressure gripping device for synchronously operating a plurality of master jaws by a link mechanism.

[0002]

2. Description of the Related Art A link mechanism is a general mechanism used as a synchronization mechanism for a plurality of movable parts.
It is rotatably attached to the tip of the movable part, reciprocates on the movement axis of the movable part, and the other moves on a concentric circumference centered on the main body.

In a fluid pressure gripping device having a structure in which a master jaw is synchronized by a link mechanism, one of the links is
It is rotatably attached to the piston or the master jaw, and reciprocates following the piston and the master jaw.

[0004] The other is rotatably mounted on a rotating plate which is rotatably mounted on a concentric circle with respect to the center of the main body, and moves on the same circumference around the center of the main body.

At this time, the link performs a reciprocating motion following the piston or the master jaw, and at the same time, performs a rocking motion in the motion direction of the piston or the master jaw.

In the fluid pressure gripping device as described above, in order to increase the moving distance of the master jaw, it is necessary to extend the piston stroke and to secure a space for preventing the movable parts such as the piston and the piston lot from interfering with each other. The overall length of the body must be increased.

Further, by extending the piston stroke, the link side rotatably attached to the rotating plate by the fulcrum shaft also needs to extend the moving distance, so that the moving distance of the side attached to the rotating plate is reduced. In order to increase the length, a method of increasing the size of the rotating plate, increasing the distance from the center of the main body to the fulcrum shaft on which the link is mounted, and lengthening the circumference on which the link mounting portion moves is adopted.

As described above, the enlargement of the rotating plate and the length of the circumference of the link attachment portion increase the size of the link mechanism, which leads to an increase in the size of the gripping device main body.

Further, by moving the position of the link to the rotary plate away from the center of the main body, the swing angle with respect to the movement direction of the piston or the master jaw becomes large, and the interference between the link and the gripping device main body at the maximum swing angle. In order to prevent this, it is necessary to increase the body width.

As described above, in the fluid pressure gripping device using the conventional link mechanism, in order to increase the moving distance of the master jaw, it is inevitable to increase the size of the link mechanism. Problems such as an increase in the size of the apparatus main body and an increase in the weight of the main body occur.

[0011]

SUMMARY OF THE INVENTION The present invention relates to a gripping device in which a plurality of master jaws are synchronously driven by a link mechanism. The aim is to reduce the weight.

[0012]

According to the present invention, there is provided a slide body for guiding a master jaw, a cylinder disposed in a direction perpendicular to the center of the main body, a piston and a piston rod accommodated reciprocally in the cylinder. In a fluid pressure gripping device having a master jaw guided by a slide body and transmitted to drive to follow a piston, and a link mechanism for synchronizing an opening and closing operation of the master jaw guided by the slide body, the above-described problem is solved. In order to solve the above problem, a link rotatably attached to a rotating plate disposed concentrically with the center of the main body is a bent link.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a partially cutaway plan view of the chuck, and FIG.
FIG. 3 is a cross-sectional view of the chuck, and FIGS. 3A and 3B are explanatory views for explaining the effect of the present invention.

According to the present invention, a plurality of slide bodies 1 are fixed and a base 2 having a fluid passage 16 for reciprocating a plurality of pistons 4, a slide body 1 for guiding a master jaw 3, and reciprocally movable in a cylinder. And a link mechanism for synchronizing the opening and closing operations of the plurality of master jaws 3 with the master jaw 3 guided by the slide body 1 and transmitted so as to follow the piston 4 A horizontal hole (first cylinder and second cylinder) is formed in the slide body 1 in parallel with each other, a piston 4 is accommodated in each cylinder so as to be able to reciprocate, and a piston lot 5 is fixed to each piston. The piston lot 5 is connected by a connection block 6 so as to reciprocate synchronously.

Each slide body has a guide groove for the master jaw 3, the master jaw 3 having the operation pin 7 attached thereto is inserted, the operation pin 7 is inserted into a connection hole provided in the connection block 6, and It is housed in a synchronized and reciprocable manner.

A pipe plate 11 in which a plurality of O-rings 18 having different diameters are arranged concentrically is attached to the base 2 to form a ring-shaped fluid passage 17.

Further, a fluid passage provided in each slide body for supplying a fluid pressure applied from a pressure port provided in the slide body 1 to each cylinder and a ring-shaped fluid passage 17 formed on the surface of the base 2 communicate with each other. A fluid passage 16 is provided in the base.

A through-hole is provided at the center between the base 2 and the center block 10, and the base 2 and the center block 10
By sandwiching and holding the hollow ring 12 by
The chuck body has a hollow structure.

A rotary plate 9 is rotatably mounted on the hollow ring 12 held by the base 2 and the center block 10 by bearings. The rotary plate 9 is provided with a plurality of bent links 8. An operating pin 7 attached to the master jaw 3 is inserted into the bent link 8.

Next, a description will be given of the bent link 8 of the fluid pressure gripping device configured as described above.

As shown in FIG. 3, in the link mechanism of the fluid pressure gripping device according to the present embodiment, one of the links 8 is rotatably attached to the connecting block 6 by the operating pin 7 and the other is attached to the hollow ring 12. Rotatively attached to the rotating plate 9 by a fulcrum pin 14.

When a fluid pressure is applied to the first pressure chamber 15a of the piston 4, the piston 4 starts moving toward the center of the main body.

Following this, the piston lot 5 fixed to the piston 4 and the connecting block 6 start moving.

The link 8 attached to the connecting block 6 which has started to move by the operating pin 7 also starts moving toward the center of the main body, and the other attached to the rotating plate 9 by the fulcrum pin 14 is concentric with the center of the main body. To start moving.

One of the links 8 moves concentrically with respect to the center of the main body, so that the link 8 swings in the movement direction of the piston 4.

When the swing angle reaches the maximum as shown in FIG. 3, in the case of the conventional unbent link in FIG.
In order to prevent interference with the inside of the slide body, the width of the slide body must be increased, which leads to an increase in the size and weight of the main body.

This embodiment is different from the conventional method in that FIG.
As shown in (a), the bending angle of the link makes it possible to keep the swing angle smaller than that of the conventional link system, and it is possible to prevent internal interference without increasing the width of the slide body.

By bending the link as described above, the size of the slide body can be reduced, which leads to a reduction in the size of the main body and a reduction in the weight of the main body.

In the above embodiment, a three-jaw chuck is described. However, the present invention is not limited to this type of gripper, and the same effect can be obtained with two-jaw and four-jaw chucks. Therefore, the size and weight of the gripping device main body can be reduced.

[0031]

According to the present invention, the swing angle with respect to the center axis of the cylinder can be suppressed to a small value by making the link shape rotatably attached to the rotating plate disposed concentrically with the center of the main body into a bent shape. Thus, interference between the link at the maximum swing angle and the inside of the gripping device main body can be prevented without increasing the width of the gripping device main body.

Further, since the gripping device main body can be made small, a lightweight gripping device can be provided.

[Brief description of the drawings]

FIG. 1 is a partially cutaway sectional view according to one embodiment.

FIG. 2 is a cross-sectional view of the chuck.

FIG. 3 is an explanatory view for explaining the effect of the present invention. 1 Slide body 2 Base 3 Master jaw 4 Piston 5 Piston lot 6 Connecting block 7 Working pin 8 Link 9 Rotating plate 10 Center block 11 Piping plate 12 Hollow ring 13 Cover 14 Support point Pin 15a First pressure chamber 15b Second pressure chamber 16 Fluid passage 17 Ring-shaped fluid passage 18 O-ring

Claims (1)

[Claims] 1. A plurality of slide bodies for guiding a master jaw, a cylinder disposed in a direction perpendicular to the center of the main body, a piston and a piston lot reciprocally housed in the cylinder, and guided by the slide body. In a fluid pressure gripping device for synchronizing the opening and closing operation of a master jaw by a link mechanism, a rotating plate rotatably arranged on a concentric circle around the main body and a plurality of master jaws are connected by a bent link. Fluid pressure holding device.