JP3101802B2 - Clamping device - Google Patents

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 for transferring a work to each work processing station, and more particularly to a clamp device for holding a plurality of types of works on one jig pallet. Related to a clamping device.

[0002]

2. Description of the Related Art A work is sequentially transported to each station.
When processing a workpiece at each station, it is necessary to hold the workpiece firmly in order to accurately process a predetermined position of the workpiece. Therefore, conventionally, the work is held by using a jig pallet on which the work is placed and a clamp device fixed to the jig pallet. Conventionally, as a clamping device, Japanese Patent Laid-Open No. 63-1
According to Japanese Patent No. 85544, a base fixed to a jig pallet is disclosed.
A base member, a casing supported by the base member, and a case.
Piston inserted into the cylinder formed in the casing
Connected to the piston via a ball screw mechanism.
With a movable rod with a clamp arm
The vertical direction of the movable rod is
With the pressing direction of the workpiece by the
Stop the rotation against the casing and move the piston upward
Move the movable rod up and down
Ball screw machine by the upward movement of the piston after the upward movement of the pad
When the movable rod rotates through the structure, the clamp arm
From the clamp position to clamp the clamp
Known are those that are turned. With this one
After setting the work on the jig pallet,
When moving down, first, the clamp arm
To the clamp position and then the clamp arm
Moves down to clamp the work.

[0003]

When a plurality of types of works having different shapes are conveyed by one jig pallet, the clamping position and the thickness are different for each work, so that various types of clamping devices corresponding to each work are required. It is necessary to replace the clamp device attached to the jig pallet every time the type of the workpiece to be transported changes.

[0004] In view of the above problems, an object of the present invention is to provide a clamp device capable of holding a plurality of types of works having different clamp positions and thicknesses.

[0005]

To achieve the above object, according to an aspect of the present invention, there is provided a clamping device provided on the jig pallet, base member and, base to be fixed to the jig pallet
Formed in the casing and the casing supported by the
Piston inserted into the cylinder
Connected to the workpiece via a threaded screw mechanism.
And a movable rod to which a pump arm is attached.
Of the workpiece by the clamp arm
Turn the piston against the casing with the pressing direction downward.
And move the movable rod during the upward movement of the piston.
The upward movement is regulated so that the movable rod
Movable rotor via ball screw mechanism by upward movement of piston
The clamp arm clamps the workpiece with the rotation of the pad.
Turn from the ramp position to the unclamping position.
In this case, the casing is rotatable with respect to the base member , and the clamp arm is screwed to the movable rod.
Inserting and positioning the movable rod vertically in the vertical direction
A groove is formed and an engaging element that can be disengaged from the positioning groove
The clamp arm can be prevented from rotating with respect to the movable rod,
In addition, the positioning groove is made different from the
It is characterized by forming a number .

According to this, the direction of the clamp arm can be changed by adjusting the rotation of the casing with respect to the base member, and even if the direction of the clamp position changes due to a change in the model of the work, this can be dealt with. .

Further, the clamp arm is screwed into the movable rod.
By doing so, it is possible to change the height of the clamp arm by moving the clamp arm forward and backward with respect to the movable rod, and to cope with this even if the thickness of the work changes due to a change in the model of the work. 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 reliably held at the adjusted height. In this case, it is possible to change the orientation of the clamp arm or engages the engaging element to any of the positioning grooves of the different plurality of positioning grooves phases, I pivoting of the casing coupled with the clamp arm The degree of freedom in adjusting the orientation of the camera increases.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, reference numeral 1 denotes a jig pallet on which a work (not shown) is placed, and a plurality of vertical grooves 11a are formed on an upper surface of the jig pallet 1. A plurality of horizontal grooves 11b orthogonal to the vertical grooves 11a were formed. Each of the vertical and horizontal grooves 11a and 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 of the grooves 11a and 11b reach the side surfaces of the jig pallet 1. I have. In addition, a fluid passage 12 formed in the jig pallet 1 is communicated with the groove bottom at the position where the vertical and horizontal grooves 11a and 11b intersect and on the side surface of the jig pallet 1 immediately below the bottom of each groove 11a and 11b. The fluid supply port 12a to be opened. The fluid supply ports 12a are for supplying a working fluid to a clamp device 2 described later, and are always provided with blind plugs 12b. The jig pallet 1 is provided with a fluid joint 13 for supplying 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 clamping device 2 provided on the jig pallet 1. Fixing bolt 15 is screwed. The fixing bolt 15 is connected to a base member 21 which will be described later in detail.
When the fixing bolt 15 is tightened, the clamping device 2 is moved to the jig pallet 1.
Fixed to The head of the T-shaped nut 14 that engages with the T-shaped groove 11 has a substantially square end surface, and is restricted from rotating by the side surfaces of the T-shaped grooves 11a and 11b. Therefore, when the fixing bolt 15 is screwed, the T-shaped nut 14 does not rotate with the screw.
The fixing bolt 15 can be securely tightened.

As shown in FIGS. 3 and 4, the clamping 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. A clamp arm 26 that clamps a work is screwed into the movable rod 24.

The base member 21 is composed of a substantially disk-shaped bottom portion 21a which comes into contact with the jig pallet 1 and a cylindrical portion 21b integrally formed with the bottom portion 21a.
The above-mentioned insertion hole 22 through which the fixing bolt 15 is inserted is formed in a, and a casing 25 is fitted to the cylindrical portion 21b so as to be freely rotatable in the lower half thereof. In addition, bottom part 2
1a is formed with a fluid inlet 27 communicating with the bottom in the cylindrical portion 21b.
As shown in FIG. 2, a flexible pipe F is connected. The bottom portion 21a and the cylindrical portion 21b are formed to have a substantially D-shape in plan view with one peripheral portion chamfered.

The casing 25 has a flange portion 2 on the upper end thereof which is seated on the upper end surface of the cylindrical portion 21b of the base member 21.
5a, and three arc-shaped long 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 moved clockwise and counterclockwise from the neutral position shown in FIG. It can be rotated by the angle α. In the illustrated example, α is set to 45 °. Further, the cylindrical cylinder 3 is provided in the casing 25.
3 and an upwardly cup-shaped piston 34 is fitted into the cylinder 33 so as to be movable up and down.
A notch 33a is formed at the lower end of the base member 21 to allow the working fluid to flow from the fluid supply path of the base member 21 into the cylinder 33,
The pressure of the working fluid was applied to the piston 34. The circumferential wall of the piston 34 has a groove 3 extending vertically.
4a is formed, and a projection 25b protruding from the inner periphery 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 was formed on the inner peripheral surface of the piston 34.

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 part 24 fitted into the through hole 25c.
a, an intermediate portion 24b having a larger diameter, and a lower portion 24c having a larger diameter. The movable rod 24 has a cylindrical hollow portion 24d opened at the lower end thereof. A first spring 35 is inserted into the hollow portion 24d, and between the lower end of the first spring 35 and the upper surface of the seat of the piston 34.
A sphere 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 attached, and the movable rod 24 and the piston 34 are urged in the direction of relative separation.
When the height of the upper end surface of the lower portion 24c of the movable rod 24 is equal to the height of the upper end surface of the piston 34, the lower end surface of the movable rod 24 and the piston 34
A gap having a distance S is formed between the seat and the upper surface of the seat.
Further, a spiral second spring 37 that abuts on 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 higher between the spring 35 and the second spring 37.

On the outer periphery of the lower portion 24c of the movable rod 24, a screw groove 24e having a semicircular cross section is formed. This screw groove 24e and a screw groove 34b formed on the inner peripheral surface of the piston 34 are formed. A ball screw mechanism is formed by inserting a plurality of balls 38 therebetween, 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 restricted rotates and the clamp arm 26
Swings between a clamp position for clamping the work and an unclamping position which is a position where the work is not clamped.

According to the above configuration, 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
Then, the movable rod 24 is pushed up, and the clamp arm 26 floats up 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 comes into contact with the ceiling surface of the casing 25 and the upward movement of the movable rod 24 is prevented, but until the piston 34 hits the lower end of the movable rod 24. The movable rod 24 is moved upward by a distance S with respect to the movable rod 24, and the upward movement causes the movable rod 24 to rotate via the ball screw mechanism, the clamp arm 26 to pivot to the unclamping position, and the clamp device 2 to enter the unclamped state. Become. A washer 39 is mounted on 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, so that the rotation of the movable rod 24 is smooth. To be done. When the working fluid is discharged from the cylinder 33, the clamp arm 26 pivots from the unclamped position to the clamped position in the reverse operation, and then the clamp arm 2
6 moves downward to press the work from above, and the clamping device 2
Becomes a clamp state.

On the upper part of the movable rod 24 into which the clamp arm 26 is screwed, three positioning grooves 24f extending in the axial direction of the movable rod 24 are formed as shown in FIG. The direction of the clamp arm 26 is determined by engaging the engaging element 40 composed of a bolt with one of the grooves. Due to the positioning grooves 24f, the direction of the clamp arm 26 can be changed as shown in FIG.
And the direction rotated clockwise and counterclockwise by an angle β from now on, and β is set to 22.5 ° in the illustrated example.

In such a configuration, the jig pallet 1
When the work to be clamped is changed, the fixing bolt 15 is first removed, and the clamp device 2 is made movable with respect to the jig pallet 1. Further, the adjustment bolt 32 is loosened so that the casing 25 can be freely rotated with respect to the base member 21, and the engaging member 40 is loosened so that the clamp arm 26 can be freely turned around the movable rod 24.

Thereafter, the clamping device 2 is moved to a desired position on the jig pallet 1 in accordance with the workpiece to be clamped.
A fixing bolt 15 is screwed onto a T-shaped nut 14 which engages with the vertical and horizontal grooves 11a and 11b, thereby fixing the clamp device 2.
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 in accordance with the thickness of the work to be clamped, thereby causing the movable arm 24 to advance and retreat. Next, the adjustment bolt 32 is tightened, and the casing 25 is attached to the base member 2.
Fix to 1 At this time, the direction is adjusted by rotating the casing 25 as necessary. And the engaging element 40
Is engaged with one of the positioning grooves 24 f of the movable rod 24 to determine the direction of the clamp arm 26. Further, the fluid supply port 12a located near the fixed position of the clamp device 2
The flexible plug F connected to the fluid inlet 27 of the base member 21 is connected to the fluid supply port 12a.

When the clamp device 2 is fixed in this way, the jig pallet 1 is transported to a work input station (not shown), and a fluid supply pipe provided at the station is connected to a fluid joint 13 so that the jig pallet 1 A working fluid such as oil or air is supplied to the fluid passage 12 of the cylinder 33.
The working fluid is guided into the inside to perform the unclamping operation of the clamp arm 26, and the 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 operated to clamp the work. Then, after clamping, the fluid supply pipe is separated from the fluid joint 13,
The jig pallet 1 is sent out from the set station onto the transport line.

[0020]

As described above, according to the present invention, even if the workpiece to be clamped changes, it is not necessary to replace the clamping device, so that the work associated with the workpiece change can be performed in a short time. In addition, there is no need to prepare various types of clamping devices, and costs can be reduced.

[Brief description of the 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. 1;

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. 3;

FIG. 5 is a sectional view showing an AA section in FIG. 4;

[Explanation of symbols]

 Reference Signs List 1 jig pallet 2 clamp 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

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-310340 (JP, A) JP-A-2-218531 (JP, A) JP-A-2-76656 (JP, A) JP-A-61- 109639 (JP, A) JP-A-63-185544 (JP, A) JP-A-4-136638 (JP, U) JP-A-58-128840 (JP, U) (58) Fields investigated (Int. ⁷ , DB name) B23Q 3/06

Claims (1)

(57) [Claims] 1. A clamping device provided on the jig pallet, base member and, base to be fixed to the jig pallet
Formed in the casing and the casing supported by the
Piston inserted into the cylinder
Connected to the workpiece via a threaded screw mechanism.
And a movable rod to which a pump arm is attached.
Of the workpiece by the clamp arm
Turn the piston against the casing with the pressing direction downward.
And move the movable rod during the upward movement of the piston.
The upward movement is regulated so that the movable rod
Movable rotor via ball screw mechanism by upward movement of piston
The clamp arm clamps the workpiece with the rotation of the pad.
Turn from the ramp position to the unclamping position.
In those with, and rotatable adjusting the casing relative to the base member, further
Screw the clamp arm into the movable rod
A longitudinal positioning groove is formed in the vertical direction in the moving rod,
Clamp arm with engaging element that can be detached from the positioning groove
Make the rotation of the movable rod free and the positioning
A clamp device, wherein a plurality of grooves are formed on a movable rod with different phases .