JPH0699328A - Clamping device - Google Patents

Abstract

(57) [Summary] [Object] To provide a clamping device which has a small vertical movement amount and which can press a work piece vertically by surely clamping the work piece. [Structure] The clamp claw 11, the air cylinder 13, the support arm 14, the link A16, and the link B17 are main components. The link A16 having the side surface 16a and the receiving surface 16b has one end pinned to the support arm 14 and the other end pinned to the clamp claw 11. One end of the link B17 is pin-connected to the rod 12, and the other end is pin-connected to the support arm 14 together with the link A16. The link B17 has a clamp claw pressing portion 17a that abuts and pushes up the lower surface of the clamp claw 11 at the clamp position, and a side surface 1 from the unclamp position to the clamp position.
A protrusion 21a that presses 6a is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a clamp device for vertically pressing a work from above to clamp the work, and particularly to a clamp which is advantageous for use in a limited space where vertical movement of a clamp claw is small. Regarding the device.

[0002]

2. Description of the Related Art As a conventional clamping device for vertically pressing a work from above to clamp it, there is a structure as shown in FIG. In this device, a substantially central portion of a clamp claw 1 is rotatably supported by a pin 2, and one end of the clamp claw 1 is connected by a pin 3 to a piston rod 5 of an air cylinder 4. Therefore, when the air cylinder 4 is operated in the vertical direction, the clamp claw 1
The other end of is rotated about the pin 2 between the clamp position shown by the solid line and the unclamp position shown by the alternate long and short dash line.

When the piston rod 5 is pulled down into the air cylinder 4, the clamp claw 1 separates from the work 6 and becomes the unclamp position. Further, when the piston rod 5 is pushed up, the clamp claw 1 becomes substantially horizontal and is in the clamp position for pressing the work 6 from above.

[0004]

By the way, in the above-described conventional clamp device, the clamp claw 1 is rotated around the pin 2 to switch between the unclamp position and the clamp position. Sometimes a space is required to raise the tip of the clamp claw 1. Securing such a space restricts the construction of an assembly line equipped with a clamp device, and therefore the amount of movement of the clamp claw (especially in the vertical direction) so that the limited space can be used effectively. There is a demand for a clamping device that has a small amount of pressure and can reliably clamp a work by vertically pressing the work from above.

[0005]

DISCLOSURE OF THE INVENTION The present invention is to solve the above-mentioned problems and includes a clamp claw, a driving means for vertically moving a rod, one end of which is pin-coupled to a support arm and the other end of which is the clamp. Link A that is pin-connected to the nail
And a link B, one end of which is pin-connected to the tip of the rod and the other end of which is pin-connected to the support arm. The link A receives pressure from the link B and is released from the clamp position. A receiving surface that rotates to the clamp position is provided, and the link B has a clamp claw pressing portion that abuts against the clamp claw and pushes it up and down during clamping, and a side surface of the link A from an unclamp position to a clamp position. It is a clamp device characterized in that it is provided with a protrusion for rotating.

[0006]

According to the above-mentioned means, the clamp device operates as follows.

At the time of unclamping, when the driving means actuates the rod downward, the link B rotates downward about the pin connecting portion with the support arm. When the link B rotates downward, the receiving surface of the link A is pressed by the link B, so that the link A rotates in the direction away from the work to move the clamp claw to the unclamp position. At this time, the clamp claws move away from the work in a trajectory that slides sideways while rising slightly.

During clamping, when the driving means actuates the rod upward, the link B rotates upward around the pin connecting portion with the support arm. When the link B rotates upward, the protrusion of the link B contacts the side surface of the link A and presses it toward the work, so the link A rotates toward the work and moves the clamp claw to the clamp position. . At this time, the clamp claw draws a trajectory that slides sideways while approaching the work piece while descending a little.
When the clamp claw is thus moved to the clamp position, the clamp claw pressing portion of the link B abuts and pushes it upward. The clamp claws that have received this force try to rotate around the pin coupling portion with the link A, so that a force that pushes the work downward is generated at the tip of the clamp claws.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the clamp device according to the present invention will be described below with reference to FIGS.

This clamp device includes a clamp claw 11 and
The main components are an air cylinder 13 as a driving means for actuating the rod 12 in the vertical direction, and a link mechanism for transmitting a driving force of the air cylinder 13 to the clamp claw 11 to perform a desired operation.

The lower end of the air cylinder 13 is supported by the support arm 14, and the rod (piston rod) 12 is mounted so as to operate in the vertical direction. Rod 1
A connecting member 15 having a U-shaped cross section is attached to the upper end of 2,
One end of a link mechanism composed of the link A16 and the link B17 is pin-coupled via a pin 18.

The link A16, which is one of the members constituting the link mechanism, is a component in which two plate-shaped members having the same shape are opposed to each other and integrally joined at the central portion, and one end is clamped via a pin 19. It is pin-connected to the claw 11 and the other end is the link B.
At the same time, it is pin-coupled to the support arm 14 via the pin 20. At the center of the link A16, a side surface 16a which receives the driving force of the air cylinder 13 via the link B when changing from the unclamp position to the clamp position, and a link B when changing from the clamp position to the unclamp position
Receiving surface 16b that receives the driving force of the air cylinder 13 via the
And are provided.

The link B, which is the other member constituting the link mechanism, is a component in which a clamp claw pressing portion 17a is vertically projected from a bar material having a substantially rectangular cross section, and one end of the link B is connected to a connecting member 15 via a pin 18. The other end is pin-coupled to the support arm 14 via the pin 20 together with the link A. The tip of the clamp claw pressing portion 17a has a semicircular cross-sectional shape, and the apex of the semicircular cross section abuts the lower surface of the clamp claw 11 at the clamp position, so that the air cylinder 1
The clamp claw 11 is pushed upward by the driving force of 3.

Further, a protrusion 21a having a hemispherical tip is provided on the tip surface of the adjusting rod 21 which penetrates the vicinity of the central portion of the clamp claw pressing portion 17a at a right angle. This protrusion 21a
Is the side surface 16a of the link A16 in the unclamp position.
And has a function of moving the link A16 and the clamp claw 11 to the clamp position by the driving force of the air cylinder 13. The adjusting rod 21 of the present embodiment is structured to be screwed with the clamp claw pressing portion 17a, and the position of the protruding portion 21a can be adjusted by changing the screwing amount.

The clamp claw 11 is a rod-shaped member which is pin-connected to one end of the link A16 with a pin 19, and a flat clamp surface 11a is formed on the lower surface of one end. The clamping surface 11a shown in the present embodiment has a shape suitable for vertically clamping the flat surface of the workpiece 6 from above. For example, when the clamped surface of the workpiece is a curved surface, the clamping surface 11a is formed. Is preferably a curved surface corresponding to the clamped surface.

Next, the operation of the clamp device having the above configuration will be described. FIG. 4 shows a state in which the clamp device is unclamped, and the rod 12 of the air cylinder 13 is pulled down to the lower end. When the rod 12 descends,
The link B17 rotates clockwise around the pin 20 and presses the receiving surface 16b of the link A16. The link A16 that receives this pressure rotates clockwise around the pin 20 and stops so that the pin 19 is located on a substantially vertical line. In such an unclamp position, the clamp claw 11
Are kept substantially horizontal with the pin 19 as the center, and the protrusion 21a is in contact with the side surface 16a.

When changing from the unclamp position shown in FIG. 4 to the clamp position for clamping the work 6, air is supplied to the air cylinder 13 to raise the rod 12. When the rod 12 rises, the link B17 rotates counterclockwise around the pin 20 and the protrusion 21a causes the link A to rotate.
The side surface 16a of 16 is pressed. By this pressing, the link A16 rotates about the pin 20 in the counterclockwise direction by about 20 to 30 degrees, and the clamp claw 11 is shown by the two-dot chain line from the unclamp position shown by the one-dot chain line as shown in FIG. After passing through the intermediate position, the pin 19 slides to the left while moving slightly downward and moves to the clamp position shown by the solid line.
When such a clamp position is reached, the clamp pressing portion 17
a comes into contact with the lower surface of the clamp claw 11, and the air cylinder 13
Pushes the clamp claws 11 upward with the force of rising. The clamp claw 11 which receives this force tries to rotate counterclockwise around the pin 19, but since the clamp surface 11a abuts the work 6 to prevent this rotation, the force to rotate is It acts as a force for pushing the work 6 downward. When the work 6 is clamped in this way, the clamping force of the work 6 by the clamp surface 11a is vertically adjusted by positioning the center of the pin 19, the clamp surface 11a and the apex of the clamp claw pressing portion 17a on the same horizontal line. Acts downward in the direction of the clamp claw 1
Enables reliable clamping by 1.

[0018]

According to the above-described clamp device of the present invention, the movement of the clamp claw between the unclamp position and the clamp position slides in the horizontal direction with some vertical movement. Therefore, the clamp device can be adopted even in a place where the space in the vertical direction is restricted, and there is an effect that the assembly line that requires the clamp device can be easily constructed.

Further, not only the amount of vertical movement is small, but also the work can be vertically clamped from above, so that the reliability of the clamping device is high.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a clamp device according to the present invention, showing a clamped state.

FIG. 2 is a diagram of a main part seen along line AA of FIG.

3 is a cross-sectional view taken along the line BB of FIG.

FIG. 4 is a diagram showing an unclamped state of the clamp device of FIG. 1.

FIG. 5 is a view of the main part as seen along the line CC of FIG.

FIG. 6 is a diagram showing a conventional example.

[Explanation of symbols]

 6 Work 11 Clamp Claw 12 Rod (Piston Rod) 13 Air Cylinder (Driving Means) 14 Support Arm 16 Link A 16a Side 16b Receiving Surface 17 Link B 17a Clamp Claw Pressing Part 18, 19, 20 Pin 21a Projection

Claims (1)

[Claims] 1. A clamp claw, drive means for actuating a rod in a vertical direction, a link A having one end pin-connected to a support arm and the other end pin-connected to the clamp claw, and one end a tip portion of the rod. And a link B, the other end of which is pin-coupled to the support arm, and the link A is provided with a receiving surface that receives pressure from the link B and rotates from a clamp position to an unclamp position. , The link B has a clamp claw pressing portion that abuts the clamp claw and pushes it up and down when clamping, and the link A
And a protrusion for rotating the unclamp position from the unclamp position to the side surface of the clamp device.