JPS622955B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a chuck used in equipment for supplying and discharging parts, robots, etc., and is characterized in that the claws open and close in parallel.

BACKGROUND TECHNOLOGY Rotating claw type chucks are often used for robots because of their simple structure, but parallel opening/closing chucks are also used, which are advantageous in terms of grip reliability.

This parallel opening/closing chuck has a structure in which the pawl is guided back and forth using a guide bar or sliding groove.The structure is complicated, it is large for its function, it is difficult to assemble, and it can become twisted depending on the way force is applied. There were some drawbacks, such as:

Problems to be Solved by the Invention This invention aims to solve the above-mentioned drawbacks of parallel opening/closing chucks, and particularly to make them smaller, lighter, simpler in structure, and easier to assemble.

Means for Solving the Problems In order to achieve the above object, the present invention reduces the number of parts, guides the slide pawl with a shaft and a plane, separates the distance between the fulcrums and makes them common with the guide shaft, and creates a reference piece for the pawl. is biased to reduce the assembly space.Specifically, there is a pressing member that is supported by the main body and can be slid in the direction intersecting the opening and closing of the slide claw, and two opposing members that are guided by the main body and can be opened and closed freely. A slide claw, an expansion biasing spring for the slide claw, a contact portion rotatably supported by the main body and abutting the pressing member in its advancing direction at a position away from the center of rotation, and a slide claw and its opening direction. It consists of a piece that transmits the displacement of the pressing member to the slide pawl, and two shafts that are provided on the main body to guide the piece and the slide pawl, and the slide pawl is biased upward. The protruding part has a reference piece with an elongated hole into which the two shafts fit, and a notch in the center into which the piece fits, and the reference piece of one claw, the piece, and the reference piece of the other claw are lined up. The purpose was achieved by means of a parallel opening/closing chuck supported on a shaft.

In addition, the cylinder and piston configuration enabled fluid control, and the claws were guided through bearings to solve the problem of twisting and smooth operation.

Embodiment An embodiment of the present invention will be described with reference to the drawings. A piston 2 is slidably fitted into a center hole 11 having a downward opening and serving as a cylinder chamber of a cylinder 1 in which a fluid passage 10 is provided. A sealing 23 is fitted into the groove 22 of the piston 2, and pressing pieces 20, 20 extending downward to both sides and bent downward are fitted between the notched guide surfaces 14, 14 to prevent rotation, and are prevented from rotating as shown in FIG. is used to guide the user in the vertical direction (first direction).

The center hole 21 is a hole for weight reduction.

The lower part of the cylinder 1 is a wide notch 12, into which pieces 3, 3 and slide claws 4, 4, which will be described later, are inserted, and side surfaces 13, 13 guide the slide claws 4, 4.

Holes 1 are provided on both sides of the notch 12 of the cylinder 1.
5, 15 are provided, through which shafts 5, 5 pass through sleeves 6, 6, and both ends are E-rings 8, 8.
It is prevented from falling out.

The pieces 3, 3 are rotatably fitted into the shafts 5, 5, and the guide elongated holes 4 are provided in the reference pieces 40, 40 of the slide claws 4, 4 through bearings 7, 7 on both sides thereof.
1 and 41 are slidably fitted. (See FIG. 4) The piece 3 has a substantially triangular shape, and one end is in contact with the pressing piece 20, and the other end is in contact with the pin 42 of the slide claw 4.

The slide pawl 4 has a notch 45 having the same width as the piece 3 in the upper center, and a pin 42 is supported here. Holes 41 are formed at two locations with an interval between the shafts 5, 5. Reference numeral 44 denotes a counterbore portion into which the expansion spring 9 is fitted astride both claws.

This sliding claw 4 is common to the left and right, and when the counterbore portions 44 are opposed (turned by 180 degrees), the reference piece 40
are combined with each other facing on the opposite side through the notch 45, forming an opening/closing pawl, and the piece 3 is rotatably inserted into the notch 45 between them, and the other end of the piece 3 and the pin 42 are connected to each other. At this time, the force of the spring 9 acts on the piston 2 via the pin 42 and the piece 3, and the piston is normally raised and the slide claws 4 are spread apart.

Operation Normally, the slide claws 4, 4 are opened by the force of the spring 9, and when grasping parts etc., air or the like is introduced from the fluid passage 10 to advance the piston 2 in the first direction.

As the piston 2 moves forward, both pressing pieces 20, 20 rotate both pieces 3, 3 and press the respective pins 42, 42.

Therefore, the sliding claws 4, 4 are guided by bearings 7, 7 fitted on the shafts 5, 5, and the sliding surfaces 43, 4
3 is guided by the side surfaces 13, 13, and the guide elongated hole 41
(direction intersecting the first direction), and parts etc. are grasped.

On the other hand, when releasing parts, etc., if the fluid pressure is released, the claws 4, 4 open by the force of the spring 9.

Although not shown, the slides 4, 4 are used with fingers fixed thereto for gripping parts and the like.

Modifications In the above embodiments, a cylinder and a piston are used, but a structure may be adopted in which a solenoid, motor, etc. are used to advance the pressing piece into the main body instead of the cylinder.

Further, although a bearing is fitted to the shaft 5 for guidance, the shaft 5 may directly guide the elongated hole 41 of the slide claw. Further, the two guide elongated holes 41 may be made to communicate with each other to form one long elongated hole.

Effects of the invention: The number of parts is small, and since guide bars and sliding grooves are not used, the workability and assemblability of the parts are good, and since the sliding is per surface, the accuracy is good, and the parallel opening/closing chuck is small and lightweight. .

Also, since the sliding claw is guided by two separate shafts, it is difficult for the grip to be twisted when grasping. Furthermore, by using bearings, the load is received by rolling, so twisting is completely eliminated.

In addition, in the configuration of the embodiment, all the slide claws, shafts, etc. are made of common parts for the left and right sides, and fluid control such as air, which is often used in chucks, can be used as is.

The displacement of the piston (pressing member) is converted by the rotation of the piece to change the direction of action and open/close the slide claws, so the direction change is efficient and the gripping force is large, compared to conventional parallel chucks of similar size. It will be 1.5 to 2 times more than that.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the present invention with the chuck closed, Fig. 2 is a plan view thereof, Fig. 3 is a bottom view of the same, Fig. 4 is a sectional view of the shaft portion, and Fig. 5 is a view of the cylinder. Figure 6 is a parts diagram of the sliding claw (front view, side view), Figure 7 is an outline diagram of the sliding jaw, and Figure 8 is a parts diagram of the piston (front view, side view). 1 is a cylinder, 2 is a piston, 20 is a pressing piece,
4 is a slide pawl, 5 is a fulcrum and guide shaft, 7 is a bearing, and 9 is an expansion biasing spring.

Claims (1)

[Scope of Claims] 1. A pressing member supported by the main body and slidable in a direction intersecting the opening and closing of the slide claws, two sliding claws guided by the main body and facing each other so as to be freely openable and closable, and expansion of the slide claws. a biasing spring, a contact part that is rotatably supported by the main body and is located away from the center of rotation; a contact part that contacts the pressing member in its advancing direction; and a contact part that contacts the slide claw in its opening direction. , consists of a piece that transmits the displacement of the pressing member to the slide claw, and two shafts that guide the slide claw and the fulcrum of the piece provided on the main body. A parallel opening/closing chuck which has a reference piece with an elongated hole into which the shaft fits, and a notch in the center into which the piece fits, and in which the reference piece of one claw, the piece, and the reference piece of the other claw are lined up and supported on the shaft. . 2. The parallel opening/closing chuck according to claim 1, wherein the main body is a cylinder and the pressing member is a piston. 3. The parallel opening/closing chuck according to claims 1 and 2, wherein a bearing is fitted to the shaft, and this bearing is fitted into the elongated hole of the reference piece.