JPS6317596Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of a clamping device for clamping a workpiece (object to be clamped) at a predetermined position during welding, press working, etc.

(Prior Art) Conventionally, as shown in FIGS. 4 and 5, this type of clamp device has a clamp cylinder attached to the rear end of a movable clamp member 2 facing a fixed clamp member 1 via a link 3. The main shaft 8, which is supported by the support plate 6 of the piston rod 5 and the support plate 7 of the fixed clamp member 1 so as to be able to rise and fall, is pushed upward by the first and second springs 9 and 10. The movable clamp member 2 is connected to the middle part of the movable clamp member 2 in a biased state, and the movable clamp member 2 is rotated to the clamp position by the upward movement of the piston rod 5, and the object to be clamped 11 is clamped between it and the fixed clamp member 1. On the other hand, it has been proposed that the movable clamp member 2 is pivoted and retracted from the clamp position by the downward movement of the piston rod 5, and the movable clamp member 2 is retracted downward together with the main shaft 8 while compressing the first and second springs 9 and 10. 1977
-Refer to Publication No. 30383).

However, in the conventional clamp device described above, the movable clamp member 2 and the piston rod 5 are connected to the link 3.
, the main shaft 8 needs to be raised and lowered by the support plates 6 and 7, and the first and second springs 9 and 10 need to be installed, which makes the structure complicated due to the large number of parts, making it difficult to assemble and adjust. Not only is it troublesome, but also
There was a problem in that if the second springs 9 and 10 deteriorated, poor work would occur.

(Purpose of the invention) The present invention was made to solve the above-mentioned conventional problems, and the purpose is to provide a clamping device that does not require springs, has a simple and compact structure, and has reliable operation. It is something.

(Structure of the invention) For this reason, the present invention rotatably connects the piston rod of the clamp cylinder to the rear end of the movable clamp member facing the fixed clamp member, and also connects the piston rod of the clamp cylinder to the middle part of the movable clamp member parallel to the clamp cylinder. A link member connected to a movably supported stopper member is rotatably connected, and a guide roller provided at this connection is guided by a guide member fixed to a fixed clamp member. It is.

The upward movement of the piston rod causes the movable clamp member whose upward movement is restricted by the stopper member to swing to the clamping position and clamps the object to be clamped between it and the fixed clamp member. The member is pivoted and retracted from the clamp position, and the movable clamp member is retreated downward in that state by being guided by the guide roller by the guide member.

(Effect of the invention) According to the invention, the stopper member is connected to the movable clamp member via the link member, the guide roller of the movable clamp member is guided by the guide member,
Since it is designed to be rotated to the clamp position, and also to be rotated away from the clamp position and retracted downward, the structure is simpler and more compact than the above-mentioned conventional devices that require a main shaft and a spring. In addition, since a spring is not required, it is highly durable and operates reliably.

(Example) As shown in FIGS. 1 and 2, the work base 14
A fixed clamp member 15 is installed above, and a clamp surface 15a on which a welding work (object to be clamped) is placed is formed on the upper part of the fixed clamp member 15, and a mounting board 17 is provided on the side. Fixed.

A side plate 18 in which a fitting hole 18a is formed is fixed to a substantially midway position in the vertical direction of the mounting board 17, and a clamp cylinder 19 is attached to the lower surface of the side plate 18.

On the other hand, the movable clamp member 20 facing the fixed clamp member 15 has a welding work piece 1 at its tip end.
A clamp surface 20a for clamping the movable clamp member 20 from above is formed, and the rear end of the movable clamp member 20 has a
A piston rod 21 of the clamp cylinder 19 located at the lower side of the fixed clamp member 15 is rotatably connected by a pin 22.

The upper end of a link member 23 is rotatably connected to the intermediate portion of the movable clamp member 20 by a pin 24, and the lower end of the link member 23 is
The upper end of a stopper member 25 supported vertically movably in parallel with the clamp cylinder 19 in the fitting hole 18a of the side plate 18 is rotatably connected by a pin 26. A stopper portion 25a having a larger shape than the mating hole 18a is formed, and the stopper portion 25a comes into contact with the lower surface of the side plate 18 to rotate the movable clamp member 20 to the clamp position shown in FIG. This will restrict upward movement beyond a predetermined position.

The pin 24 connecting the movable clamp member 20 and the link member 23 is provided with guide rollers 27, 27, while the mounting board 17 is provided with guide members 28, 28 whose upper ends 28a, 28a are formed in an arc shape. are fixed, and the guide members 28, 28
The guide rollers 27, 27 are guided by this.

Note that 29 is a swing regulating plate provided on the stopper member 25 to prevent the link member 23 from swinging more than necessary.

With the above configuration, when the piston rod 21 is currently being moved upward, the stopper member 25,
The link member 23 is in the upward movement position, the movable clamp member 20 is rotated to the left to the clamp position, and the welding work 16 is clamped between it and the fixed clamp member 15.

Next, when the piston rod 21 is moved downward, the guide rollers 27, 27 are moved to the guide member 2.
8, 28, the movable clamp member 20 turns right from the clamp position to the retracted position (see the two-dot chain line in Fig. 3) and retracts, and then, as shown in Fig. 3, the movable clamp member 20 27 rides on the guide members 28, 28, the link member 23 bends around the pin 26, and the movable clamp member 25 retreats downward while remaining in the retracted position. Following this, the stopper member 25
moves downward while being guided by the fitting hole 18a.

In this retracted position, the upper end of the movable clamp member 25 is connected to the clamp surface 15a of the fixed clamp member 15.
Since the welding workpiece 16 is located lower than the movable clamping member 15, there is no possibility that the welding workpiece 16 will be damaged by hitting the movable clamping member 15 when the welding workpiece 16 is placed on the fixed clamping member 15.

Next, when the piston rod 21 is moved upward, the movable clamp member 25 rises while remaining in the retracted position, and the stopper member 25 also moves upward following this movement.

Then, the stopper part 25a of the stopper member 25
When the movable clamp member 15 comes into contact with the side plate 18, the movable clamp member 15
In this case, the guide rollers 27, 27 are connected to the guide member 28,
Since it comes to be guided by the upper end part 28a of 28, it is turned to the left to the clamping position, and the welding workpiece 16 is clamped between it and the fixed clamping member 15.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of the clamping device according to the present invention, Fig. 2 is a - sectional front view of Fig. 1, Fig. 3 is a side sectional view of Fig. 1 when not clamped, and Fig. 4 is a conventional A side view of the clamp device, FIG. 5 is a side view of FIG. 4 when it is not clamped. 15... Fixed clamp member, 16... Welding work (object to be clamped), 19... Clamp cylinder, 20... Movable clamp member, 20a... Clamp surface, 21... Piston rod, 23... Link member, 25 ... Stopper member, 27 ... Guide roller, 28 ... Guide member.

Claims (1)

[Scope of claim for utility model registration] A fixed clamp member on which an object to be clamped is placed;
a movable clamp member having a clamping surface for clamping an object to be clamped at its tip; and a movable clamp member disposed at the lower side of the fixed clamp member,
a clamp cylinder rotatably connected to a rear end portion of the movable clamp member; a link member having an upper end rotatably connected to an intermediate portion of the movable clamp member; a clamp cylinder connected to a lower end portion of the link member; a stopper member that is movably supported in parallel with the cylinder and restricts upward movement of the movable clamp member beyond a predetermined level in order to rotate the movable clamp member to the clamp position; and a guide member that is fixed to the fixed clamp member and that guides the guide roller and causes the movable clamp member to retreat downward in a state in which it is pivoted and retracted from the clamp position. clamping device.