JPH0970727A - Clamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cope with even a change in the direction of a clamp position due to the alteration of a workpiece type by providing a casing for supporting a movable rod mounted with a clamp arm engaging the workpiece to be adjustably pivoted relative to a base member. SOLUTION: A fixing bolt is screwed into a T-shaped nut engaging longitudinal and lateral grooves by moving a clamp device 2 to a desired position of a jig pallet according to a clamped workpiece to fix the clamp device 2. Then a clamp arm 26 is rotated and threadingly moved forward and backward relative to a movable rod 24 according to the thickness of the clamped workpiece to adjust the height of the cramp arm 26. Next, an adjusting bolt 32 is fastened to fix a casing 25 to a base member 21. Then, if necessary, the casing 25 may be pivoted to adjust the direction thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp device provided on a jig pallet that conveys a work to each work processing station, and is particularly used for holding a work of a plurality of types with one jig pallet. Clamp device.

[0002]

2. Description of the Related Art Work pieces are sequentially conveyed to each station,
When processing a work at each station, it is necessary to firmly hold the work in order to accurately process a predetermined position of the work. Therefore, conventionally, a work is held by using a jig pallet on which the work is placed and a clamp device fixed to the jig pallet.

[0003]

By the way, when a plurality of types of works having different shapes are conveyed by one jig pallet, the clamp position and the thickness are different for each work. Therefore, a wide variety of clamping devices corresponding to each work are provided. Need to be prepared, and it is necessary to replace the clamp device attached to the jig pallet each time the type of work to be transported changes.

In view of the above problems, it is an object of the present invention to provide a clamp device capable of holding a plurality of types of works having different clamp positions and different thicknesses.

[0005]

In order to achieve the above object, the present invention is a clamp device provided on a jig pallet, wherein a base member fixed to the jig pallet and a clamp arm for engaging a work. And a casing supported by a base member that supports a movable rod to which is attached, and the casing is rotatable and adjustable with respect to the base member.

According to this, by rotating the casing with respect to the base member, the direction of the clamp arm can be changed, and this can be dealt with even if the direction of the clamp position is changed by changing the model of the work. .

Further, the clamp arm is screwed into the movable rod, a longitudinal positioning groove is formed in the movable rod in the axial direction, and the clamp arm is prevented from rotating with respect to the movable rod by an engaging element which can be engaged with and disengaged from the positioning groove. If this is done, the height of the clamp arm can be changed by screwing the clamp arm back and forth with respect to the movable rod, and this can be dealt with even if the thickness of the work changes due to a change in the model of the work. Then, after the adjustment, if the engaging element is engaged with the positioning groove, the clamp arm is prevented from rotating and the clamp arm is securely held at the adjusted height. In this case, if a plurality of positioning grooves having different phases are formed on the movable rod, the direction of the clamp arm can be changed depending on which positioning groove the engaging element is engaged with, and the rotation of the casing can be prevented. Together, the degree of freedom in adjusting the orientation of the clamp arm is increased.

[0008]

1 and 2, reference numeral 1 denotes a jig pallet on which a work (not shown) is placed. The jig pallet 1 has a plurality of vertical grooves 11a on the upper surface thereof. A plurality of horizontal grooves 11b orthogonal to the vertical groove 11a were formed. Each of the vertical and horizontal grooves 11a, 11b is formed as a T-shaped groove having a substantially inverted T-shaped cross-section in a plane orthogonal to the longitudinal direction, and both ends of each groove 11a, 11b reach the side surface of the jig pallet 1. There is. The bottom surface of the jig pallet 1 at the position where the vertical and horizontal grooves 11a and 11b intersect, and directly below the bottom surface of each groove 11a and 11b, is connected to the fluid passage 12 formed in the jig pallet 1. The fluid supply port 12a is opened. Each of the fluid supply ports 12a is for supplying a working fluid to the clamp device 2 described later, and is always provided with a blind plug 12b. The jig pallet 1 is provided with a fluid joint 13 that supplies a working fluid to the fluid passage 12.

A T-shaped nut 14 having a substantially T-shaped cross section is slidably engaged with each of the grooves 11a and 11b, and the T-shaped nut 14 is provided with a clamp device 2 provided on the jig pallet 1. The fixing bolt 15 is screwed. The fixing bolt 15 includes a base member 21 which will be described later in detail.
When the fixing bolt 15 is tightened, the clamp device 2 is inserted into the insertion hole 22 formed in the jig pallet 1.
Fixed to. The head portion of the T-shaped nut 14 that engages with the T-shaped groove portion 11 has a substantially square end face shape, and is regulated by the side surfaces of the T-shaped groove portions 11a and 11b so as not to rotate. Therefore, when the fixing bolt 15 is screwed, the T-shaped nut 14 does not rotate with it,
The fixing bolt 15 can be securely tightened.

As shown in FIGS. 3 and 4, the clamp device 2 includes a base member 21 fixed to the jig pallet 1.
And a casing 25 that supports a movable rod 24 that can move up and down, and a clamp arm 26 that clamps a work is screwed into the movable rod 24.

The base member 21 is composed of a substantially disc-shaped bottom plate portion 21a that comes into contact with the jig pallet 1 and a cylindrical portion 21b integrally formed with the bottom plate portion 21a.
The above-mentioned insertion hole 22 through which the fixing bolt 15 is inserted is formed in a, and the casing 25 is fitted in the cylindrical portion 21b in its lower half portion so as to be rotatable and adjustable. Also the bottom part 2
A fluid inlet 27 communicating with the bottom of the cylindrical portion 21b is formed in the la 1a.
As shown in FIG. 2, the flexible pipe F is connected. The bottom plate portion 21a and the cylindrical portion 21b are chamfered on one side around the bottom plate portion 21a and the cylindrical portion 21b, and are formed in a substantially D shape in a plan view.

The casing 25 has, at its upper portion, a flange portion 2 which is seated on the upper end surface of the cylindrical portion 21b of the base member 21.
5a, and three arc-shaped elongated holes 31 extending in the circumferential direction are formed in the flange portion 25a. An adjusting bolt 32 screwed to the upper end surface of the cylindrical portion 21b is provided in each elongated hole 31.
When the adjustment bolt 32 is tightened to fix the casing 25 to the base member 21, the casing 25 is rotated clockwise and counterclockwise from the neutral position shown in FIG. It can be rotated by an angle α. In the illustrated example, α is set to 45 °. Further, the cylindrical cylinder 3 is provided in the casing 25.
3 is formed, an upward cup-shaped piston 34 is fitted in the cylinder 33 so as to be vertically movable, and
A cutout 33a is formed at the lower end of the base member 21 to allow the working fluid to flow from the fluid supply passage of the base member 21 into the cylinder 33.
The pressure of the working fluid is applied to the piston 34. In addition, in the peripheral wall portion of the piston 34, the groove 3 extending in the vertical direction is formed.
4a is formed, and a protrusion 25b protruding to the inner circumference of the casing 25 is engaged with the groove 34a to prevent the piston 34 from rotating. Further, a thread groove 34b having a semicircular cross section is formed on the inner peripheral surface of the piston 34.

Further, a through hole 25c communicating with the inside of the cylinder 33 is formed at the upper end of the casing 25, and the movable rod 24 is slidably fitted in the through hole 25c.
The movable rod 24 has an upper portion 24 that fits into the through hole 25c.
a, an intermediate portion 24b having a larger diameter than that, and a lower portion 24c having a larger diameter, and a cylindrical hollow portion 24d opening to the lower end of the movable rod 24. A first spring 35 is inserted in the hollow portion 24d, and between the lower end of the first spring 35 and the upper surface of the seat portion of the piston 34,
A spherical body 36 having a diameter smaller than the inner diameter of the hollow portion 24d and larger than the inner diameter of the first spring 35 is mounted to urge the movable rod 24 and the piston 34 in the relative separating direction,
When the heights of the upper end surface of the lower portion 24c of the rod and the upper end surface of the piston 34 are equal, the lower end surface of the movable rod 24 and the piston 34
A gap of distance S is formed between the upper surface of the seat and the upper surface of the seat.
A second spiral spring 37 that abuts the ceiling surface of the cylinder 33 and the upper end surface of the piston 34 is mounted in the casing 25, and the piston 34 is urged downward. The first
The spring strength of the second spring 37 is stronger than that of the spring 35 and the second spring 37.

A thread groove 24e having a semicircular cross section is formed on the outer periphery of the lower portion 24c of the movable rod 24. The thread groove 24e and the thread groove 34b formed on the inner circumferential surface of the piston 34 are formed. A ball screw mechanism is configured by inserting a plurality of balls 38 between them, and when the piston 34 and the movable rod 24 move up and down relative to each other, the movable rod 24 whose rotational movement is not regulated rotates, and the clamp arm. 26
Rotates between a clamp position where the work is clamped and an unclamp position where the work is not clamped.

According to the above construction, when the working fluid is supplied into the cylinder 33, the piston 34 moves upward against the elastic force of the second spring 37, and the spherical body 36 and the first spring 35.
The movable rod 24 is pushed up via and, and the clamp arm 26 is lifted from the work. When the movable rod 24 moves upward by a predetermined stroke, the upper end of the intermediate portion 24b of the movable rod 24 contacts the ceiling surface of the casing 25 to prevent the movable rod 24 from moving upward, but the piston 34 hits the lower end of the movable rod 24. , The movable rod 24 is moved upward by a distance S, the movable rod 24 is rotated by the upward movement via the ball screw mechanism, the clamp arm 26 is swung to the unclamp position, and the clamp device 2 is unclamped. Become. A washer 39 is attached to the upper end of the intermediate portion 24b of the movable rod 24, and the movable rod 24 is brought into contact with the ceiling surface of the cylinder 33 via the washer 39 to smoothly rotate the movable rod 24. To be done. When the working fluid is discharged from the inside of the cylinder 33, the clamp arm 26 pivots from the unclamp position to the clamp position by the operation opposite to the above, and then the clamp arm 2
6 moves downward to press the work from above, and the clamp device 2
Is clamped.

By the way, as shown in FIG. 5, three positioning grooves 24f extending in the axial direction of the movable rod 24 are formed on the upper portion of the movable rod 24 into which the clamp arm 26 is screwed and screwed to the clamp arm. The direction of the clamp arm 26 is determined by engaging the engaging element 40 formed of a bolt with any groove. With these positioning grooves 24f, the direction of the clamp arm 26 is as shown in FIG.
It is possible to change the state shown in (1) to the direction rotated by the angle β from clockwise to counterclockwise, and β is set to 22.5 ° in the illustrated example.

In such a structure, the jig pallet 1
When the work to be clamped is changed by, the fixing bolt 15 is first removed to make the clamp device 2 movable with respect to the jig pallet 1. Further, the adjustment bolt 32 is loosened so that the casing 25 can be rotationally adjusted with respect to the base member 21, and the engagement element 40 is loosened so that the clamp arm 26 can be swung around the movable rod 24.

Thereafter, the clamping device 2 is moved to a desired position on the jig pallet 1 according to the work to be clamped,
The fixing bolt 15 is screwed into the T-shaped nut 14 that engages with the vertical and horizontal grooves 11a and 11b, and the clamp device 2 is fixed.
At this time, the height of the clamp arm 26 is adjusted by rotating the clamp arm 26 with respect to the movable rod 24 and moving the clamp arm 26 back and forth according to the thickness of the workpiece to be clamped. Next, the adjusting bolt 32 is tightened to attach the casing 25 to the base member 2
Fixed to 1. At this time, the casing 25 is rotated as needed to adjust the direction. And the engaging element 40
Is engaged with one of the positioning grooves 24f of the movable rod 24 to determine the direction of the clamp arm 26. Further, the fluid supply port 12a existing near the fixed position of the clamp device 2
The blind plug 12b is removed, and the flexible pipe F connected to the fluid introduction port 27 of the base member 21 is connected to the fluid supply port 12a.

When the clamp device 2 is fixed in this manner, the jig pallet 1 is conveyed to a work loading station (not shown), the fluid supply pipe provided at the station is connected to the fluid joint 13, and the jig pallet 1 Working fluid such as oil or air is supplied to the fluid passage 12 of the cylinder 33 through the flexible pipe F from the fluid supply port 12.
A working fluid is introduced into the clamp arm 26 to unclamp it so that a work can be placed. next,
After the work is placed on the jig pallet 1, the working fluid is discharged from the cylinder 33, and the clamp arm 26 is clamped to clamp the work. Then, after clamping, the fluid supply pipe is detached from the fluid joint 13,
The jig pallet 1 is sent out from the set station onto the transfer line.

[0020]

As described above, according to the present invention, even if the work to be clamped is changed, it is not necessary to replace the clamp device, so that the work accompanying the change of the work can be performed in a short time. Further, it is not necessary to prepare various kinds of clamp devices, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view showing a jig pallet of the present invention.

FIG. 2 is a side view showing the jig pallet of FIG.

FIG. 3 is a plan view showing a clamp device of the present invention.

FIG. 4 is a sectional view showing a side section of the clamp device of FIG.

5 is a cross-sectional view showing a cross section taken along the line AA of FIG.

[Explanation of symbols]

 1 Jig Pallet 2 Clamping Device 11 T-shaped Groove 14 T-shaped Nut 15 Fixing Bolt 21 Base Member 24 Movable Rod 25 Casing 26 Clamp Arm 34 Piston 35 First Spring 36 Sphere 37 Second Spring 38 Ball

Claims (3)

[Claims] 1. A clamp device provided on a jig pallet, which is supported by a base member which supports a base member fixed to the jig pallet and a movable rod having a clamp arm for engaging a work. And a casing for adjusting the rotation of the casing relative to the base member. 2. A clamp arm is screwed into a movable rod, and a positioning groove that is long in the axial direction is formed in the movable rod, and the clamp arm is prevented from rotating with respect to the movable rod by an engaging element that can be engaged with and disengaged from the positioning groove. The clamping device according to claim 1, wherein: 3. The clamp device according to claim 1, wherein the movable rod is provided with a plurality of positioning grooves having different phases.