JPS5920915Y2 - clamp device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a clamping device for clamping a workpiece in a machine tool or the like.

For example, a clamp device in a machine tool has conventionally had a structure as shown in FIG.

In the figure, 1 is a clamper, 2 is a clamp arm, and 3
is the cylinder, 4 is the cylinder rod, 5 is the connecting rod, 6
is the workpiece.

The clamper 1 is fixed to the arm 2 by two bolts 7, the upper end of the cylinder rod 4 is rotatably connected to the arm 2, and the upper and lower ends of the connecting rod 5 are rotatably connected to the arm 2 and cylinder 3, respectively. It is.

In the above device, the cylinder rod 4 expands and contracts in the direction of arrow A to clamp or unclamp the workpiece 6.

In such a lamp device, if the workpiece 6 to be clamped is different, it is necessary to replace the clamper 1 depending on the shape of the workpiece.

However, in the case of the above-mentioned clamp device in which the clamper 1 is fixed by the bolt 7, when replacing the clamper 1, the bolt 7 must be loosened and removed, and then the bolt must be tightened again.

That is, the conventional clamping device has the drawback that it takes time to replace the clamper and requires a bolt tool.

In view of the above circumstances, the purpose of the present invention is to provide a clamping device that allows clampers to be replaced in an extremely short time and does not require any tools during replacement.
The gist is that in a clamping device composed of a clamp arm driven by a cylinder or the like and a clamper attached to the clamp arm, a. a groove portion that can be fitted together, b, and an insertion hole formed in the side wall of the groove portion;
A lock pin biased by a spring is slidably inserted into the groove, C a retaining groove is formed at the insertion side end of the side wall of the groove, and d the lock pin is inserted into the proximal end of the clamper. A hole into which the tip of the pin can fit and a pin which can be engaged with the engagement groove are provided, the clamper is inserted into the groove, and the pin of the clamper is engaged with the engagement groove of the clamp arm. The clamping device is characterized in that the clamper is attached to the clamp arm by fitting the tip of the lock pin into the hole of the clamper under the biasing force of the spring.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.

FIG. 2 is a diagram showing a clamping device according to the present invention, and a
is a conceptual front view, b is a conceptual plan view, C is a (7) C-
It is a cross-sectional conceptual diagram along C line.

In the figure, 10 is a clamper, 11 is a clamp arm, 12 is a cylinder rod, 13 is a connecting rod, and 14 is a workpiece.

The cylinder rod 12 and the connecting rod 13 are similar to the cylinder rod 4 and the connecting rod 5 shown in FIG. 1, respectively, and are rotatably connected to the arm 11 by shafts 12a and 13a, respectively.

A cylindrical pin 15 is fitted into the clamper 10, and the clamper 10 is inserted into the groove 11a formed on the upper surface of the arm and has a U-shaped cross section from the direction of arrow G as shown in FIG. Both left and right ends of the pin 15 are engaged with a pair of left and right U-shaped retaining grooves 11b formed on the front end surface of the arm 11.

Further, the clamper 10 and the arm 11 are engaged with each other by a lock pin device 16.

The lock pin device 16 includes a bush 17 screwed onto the arm 11, a lock pin 18 slidably and rotatably inserted into the insertion hole of the bush 17, and the lock pin 18.
It comprises a grip portion 19 connected to the rear end portion by a pin 18a and brought into contact with the rear end surface of the bush 17.

The lock pin 18 is always biased forward by a spring 20 provided in the bush 17, and the tip of the lock pin 18 is fitted into the hole 10a of the clamper 10 due to this bias force.

Further, a pair of sloped portions 17b, 19b facing each other is provided on the rear end surface of the bush 17 and the front end surface of one of the grip portions.
are formed respectively, and a pair of slope portions 17 b, 1
A pair of flat portions 17a and 19a are formed on the top of 9b, respectively.

In the clamp device as described above, the cylinder rod 12 is moved in the direction of the arrow, and the workpiece 14 is pressed and clamped by the clamper 10 in the direction of the arrow E.

At this time, the clamping force is applied from the cylinder rod 12 to the arm 11, and from the arm 11 to the bottom surface 11 of the groove 11a.
C to the clamper 10, and the clamper 1
0 is engaged with the arm 11 via the pin 15 and the retaining groove 11b, so that the workpiece 'l is removed from the clamper 10.
It is transmitted to #14.

That is, when clamping, no force is applied to the lock pin device 16, and the lock pin device 16 merely prevents the clamper 10 from coming off the arm 11.

Next, replacement of the clamper 10 in the above clamping device will be explained.

First, the clamper 10 is installed as shown in FIG.
To remove it, rotate the grip part 19.

Then, one grip part and the bushing 17 are connected to the slope part 19 b
, 17b, so as the lock pin 18 is rotated, it is pulled backward against the spring 20, and when the lock pin 18 is rotated 180 degrees, the flat part 19a of the grip rests on the flat part 17a of the bushing. , lock pin 18
is completely pulled out from the clamper 10 and held as it is pulled out.

In this way, the clamper 10 can be removed from the arm 11 by simply moving it in the direction of arrow F.

On the other hand, in order to mount a new clamper 10, the clamper 10 is inserted into the groove 11a of the arm from the direction of arrow G and fitted, and the pin 15 is engaged with the engagement groove 11b.

Then, the lock pin hole 10a of the clamper is located on the same axis as the lock pin 18 -42.

After that, rotate the grip part 19 and press the flat part 1 of the bushing.
7a and the flat part 19a of the grip part 19, the grip part 19 moves forward while rotating naturally due to the spring 20, and stops as shown in the figure after rotating 180 degrees, and the tip of the lock pin 18 is released. Clamper lock pin hole 10a
, the clamper 10 and the arm 11 are engaged, and the mounting of the clamper 10 is completed.

As explained above, the clamp device according to the present invention fits the clamper into the groove of the clamp arm, and then engages the pin of the clamper with the retaining groove of the arm.
The clamper and the arm are engaged by a lock pin device which is activated by a lock pin biased by a spring.

That is, the clamper is attached to the arm by two means: a pin and a retaining groove, and a lock pin. Therefore, the arm can be attached or removed by pulling out the lock pin of the lock pin device against the spring, or by pulling out the lock pin of the lock pin device against the spring. All you have to do is insert the lock pin, and then simply pull out the clamper from the groove in the arm.
Alternatively, it is sufficient to simply fit the clamper into the groove.

Therefore, the clamper can be replaced very easily and in a short time, and no tools are required for the replacement.

Various specific examples can be considered as a lock pin device equipped with a spring-loaded lock pin, but for example, if configured as in this embodiment, it is easy to insert and remove the lock pin and maintain the state in which the lock pin is removed. is extremely easy.

[Brief explanation of drawings]

FIG. 1 is a conceptual front view showing a conventional clamp device, and FIG. 2 is a diagram showing an embodiment of the clamp device according to the present invention, in which a is a conceptual front view, b is a conceptual plan view, and C is a conceptual diagram of a. It is a sectional view taken along the line CC. 10... Clamper, 11... Clamp arm, 11a... Arm groove, 11 b
...Engagement groove, 15...Pin, 16...
...Lock pin device, 17... Bush,
17a...Flat part, 17b...Slope part, 18...Lock pin, 19...Grip part, 19a...Flat part, 19b・・・・・・
Slope part, 20... Spring.

Claims (2)

[Scope of utility model registration request] (1) In a clamping device composed of a clamp arm driven by a cylinder or the like and a clamper attached to the clamp arm, a. The base end of the clamper is removably fitted into the clamp arm. (b) A lock pin urged into the groove by a spring is slidably inserted into the insertion hole formed in the side wall of the groove, and (C) the insertion side end of the side wall of the groove. an engaging groove is formed in the clamper; The pin of the clamper is inserted into the groove and engaged with the retaining groove of the clamp arm, and the tip of the lock pin is fitted into the hole of the clamper by the biasing force of the spring, thereby tightening the clamper. A clamp device characterized in that it is configured to be attached to a clamp arm. (2) The lock pin is slidably and rotatably inserted into the insertion hole, and a grip portion is provided at the rear end of the lock pin, and a front end surface of the grip portion and a side surface of the clamp arm are provided. A pair of sloped parts facing each other are formed respectively, and a pair of flat parts are respectively formed on the tops of the pair of sloped parts, and the pair of sloped parts can be rotated by rotating the grip part. The lock pins slide against each other and retreat against the spring, and the tips of the lock pins are removed from the holes of the clamper, and the pair of flat parts are pressed against each other, causing the lock pins to move to the retreat position. The clamping device according to claim 1, characterized in that the clamping device is configured to be held.