JPH10113835A - Clamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly prevent occurrence of falling and breaking of a clamp main body by externally installing the cylindrical clamp main body through a return spring free to advance and retreat on a clamp post fixed on a pallet. SOLUTION: A clamp main body 24 provided with a clamp arm 22 to clamp a work W is formed free to slide by externally fitting on a clamp post 20 which is cylindrical and fixed on a pallet 12. Consequently, it is possible to reasonably increase a diameter of the clamp main body 24 in a state of miniaturizing the whole of a clamp device 10 and to efficiently improve rigidity of this clamp main body 24 itself. Accordingly, it is possible to certainly prevent occurrence of falling and breaking of the clamp main body 24 at the time of one-sidedly clamping the work W by the clamp arm 22 provided on this clamp main body 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp device for clamping a work on a pallet by a pivotable clamp arm.

[0002]

2. Description of the Related Art Generally, when various works such as drilling and cutting are performed on a work to be worked, a clamping device is widely used to clamp the work on a pallet. I have.

For example, as shown in FIG. 8, in a conventional clamping device 1, a cylinder chamber 3 is formed in a casing 2 and a piston 4 is slidably disposed in the cylinder chamber 3. . A rod 4a extends upward from the piston 4, and a clamp arm 5 is provided at an upper end of the rod 4a.
And a lead groove 6 formed on the outer periphery of the rod 4a and a groove 7 formed on the inner periphery of the casing 2.
And the ball 8 is fitted integrally.

[0004] When the compressed fluid is supplied to the upper side of the cylinder chamber 3 in a state where the work W is placed on the receiving seat 9, the rod 4 a descends integrally with the piston 4. At this time, the rod 4a pivots via the ball 8 integrally fitted into the lead groove 6 and the groove 7, and the clamp arm 5 provided on the upper part of the rod 4a descends while pivoting and descends. 9 is clamped on the workpiece W.

[0005]

However, the above-mentioned clamp device 1 is downsized to avoid interference with other equipment, and the diameter of the rod 4a supporting the clamp arm 5 is relatively small. The diameter is set. For this reason, when clamping the work W with the clamp arm 5,
The rod 4a may fall down and the clamping force may decrease, or the rod 4a may break. As a result, it has been pointed out that the work W cannot be reliably and efficiently clamped, and that maintenance of the equipment is frequently required.

SUMMARY OF THE INVENTION The present invention solves this kind of problem, and provides a clamp device that is suitable for miniaturization of the device itself and long-term use and that can reliably apply a desired clamping force. Aim.

[0007]

According to the present invention, a cylindrical clamp body is provided on a clamp post fixed to a pallet via a return spring so as to be able to advance and retreat. When the clamp bolt is screwed into the screw hole of the clamp post, the clamp body pivots under the guide action of the lead groove provided on the outer periphery of the clamp post and the guide pin provided on the outer periphery of the clamp body. While moving to the pallet side. Therefore, the work on the pallet is clamped by the clamp arm provided on the clamp body.

[0008] Here, the clamp body supporting the clamp arm has a cylindrical shape which is covered by the clamp post, and the diameter of the clamp body is considerably increased.
Therefore, the rigidity of the clamp body itself is effectively improved, and it is possible to reliably prevent the clamp body from falling or breaking. As a result, the desired clamping force can be effectively maintained, and an efficient clamping operation is performed.

A straight groove parallel to the axial direction is provided on the outer periphery of the clamp post so as to be continuous with the lead groove. Therefore, the clamp arm moves toward the work after facing the work, and can press and hold the work more reliably.

[0010]

FIG. 1 is a plan view of a pallet 12 on which a clamp device 10 according to an embodiment of the present invention is mounted. The pallet 12 is configured so that four works W are positioned and held, and four openings 14 are formed corresponding to the shape of the works W. The pallet 12 is provided with the clamp device 10 according to the present embodiment for each work W, and is provided with two positioning pins 16 for each work W.
A receiving seat 18 is provided near zero.

As shown in FIGS. 2 and 3, the clamp device 10 includes a clamp post 2 fixed to a pallet 12.
0, a cylindrical clamp body 24 provided with a clamp arm 22 which is provided on the clamp post 20 so as to be able to advance and retreat to clamp the work W on the pallet 12.
A return spring 26 interposed between the clamp post 20 and the clamp body 24 to urge the clamp arm 22 in a direction away from the workpiece W; And a clamp bolt 28 for pressing against the clamp post 20 side.

The clamp post 20 has a substantially cylindrical shape, and a screw hole 30 into which the clamp bolt 28 is screwed is formed at the center thereof. A flange portion 31 is provided at one end of the clamp post 20.
Has a shape in which a part of a disk shape is cut out, and a pair of fixing screw holes 32 are formed in parallel with the screw holes 30. In the outer peripheral portion of the clamp post 20, a lead groove 34 inclined in the circumferential direction and a straight groove 36 parallel to the axial direction of the clamp post 20 are continuously formed at an end of the lead groove 34 on the flange portion 31 side. It is formed integrally.

At the center of the clamp body 24, a recess 38 is formed for accommodating a head 28a of the clamp bolt 28.
Sits down. The depth of the recess 38 is set such that when the head 28 a of the clamp bolt 28 abuts against the seat surface 40, the upper end surface does not protrude upward from the upper end surface 22 a of the clamp arm 22. . This upper end face 22a
It is arranged below the upper surface of the work W by a predetermined dimension.

The inner diameter of the hole 44 communicating with the recess 38 via the small-diameter hole 42 is substantially equal to the outer diameter of the clamp post 20. At the lower edge of the clamp body 24, the clamp post 20 protrudes inward from the hole 44.
Guide pins 46 engageable with the lead groove 34 and the straight groove 36 are screwed. Upper end surface 20a of clamp post 20
, And both ends of the return spring 26 abut against the wall surface 48 that expands in diameter from the small-diameter hole portion 42 of the clamp body 24.

The guide pin 46 continuously engages with the straight groove 36 from the lead groove 34 to move the clamp arm 22 to the workpiece W.
Has a function of pivoting on the work W from a position where it does not interfere with attachment and detachment of the work W, and further descending to press the work W against the receiving seat 18. The guide pin 46, the lead groove 34 and the straight The shape and position of the groove 36 are set in advance.

The pallet 12 has a large-diameter hole 50 and a small-diameter hole 52 formed coaxially.
The flange 31 of the clamp post 20 is inserted into the small hole 52, and the clamp body 24 is slidably fitted in the small-diameter hole 52. The pallet 12 includes a clamp post 20.
A bolt insertion hole 54 is formed corresponding to the fixing screw hole 32 of the above. A tip of a bolt 56 inserted into the hole 54 is screwed into the fixing screw hole 32 to fix the clamp post 20. It is fixed to the pallet 12.

The operation of the clamp device 10 configured as described above will be described below.

First, as shown in FIGS. 4A and 4B,
In a state where the clamp bolt 28 is loosened, the clamp body 24 is moved to the uppermost position by the elastic force of the return spring 26.
That is, the guide pin 46 is arranged at a position where it engages with the upper end of the lead groove 34, and the clamp arm 22 is retracted to a position where it does not interfere with the attachment / detachment of the work W. Then, the work W is arranged on the pallet 12, and the work W is positioned and placed on the positioning pins 16 and the receiving seats 18.

Next, as shown in FIGS. 5A and 5B, when the clamp bolt 28 starts screwing in a tightening direction by a nut runner (not shown), the head 28a of the clamp bolt 28 Face 4
0 is pressed downward (toward the clamp post 20). For this reason, the clamp body 24 is pressed downward against the elastic force of the return spring 26, and the lead groove 34 and the guide pin 46
Under the guide action of, the workpiece W moves downward while being swung by a predetermined angle toward the work W.

When the screwing operation of the clamp bolt 28 is continued, under the guiding action of the lead groove 34 and the guide pin 46,
Clamp arm 22 provided on clamp body 24
Descends while turning further, and the clamp arm 22
Faces a position above the work W with a predetermined gap.
In this position, the guide pin 46 is positioned between the lead groove 34 and the straight groove 36.
(See FIGS. 6A and 6B).

When the clamp bolt 28 is further screwed and screwed into the screw hole 30, the clamp body 2
4 descends without turning under the guide action of the guide pin 46 and the straight groove 36. Therefore, the clamp arm 22
The work W is pressed toward the seat 18 to clamp the work W (see FIGS. 7A and 7B).

In this case, in this embodiment, the clamp body 24 provided with the clamp arm 22 for clamping the work W has a substantially cylindrical shape, and is externally attached to the clamp post 20 fixed to the pallet 12. It is fitted and slidable. Therefore, the diameter of the clamp body 24 can be considerably increased in a state where the entire clamp device 10 is downsized, and the rigidity of the clamp body 24 itself can be effectively improved.

Therefore, when the work W is clamped by the clamp arm 22 provided on the clamp body 24 in a one-sided manner, it is possible to reliably prevent the clamp body 24 from falling or breaking. This makes it possible to apply a desired clamping force to the work W via the clamp arm 22, thereby reliably preventing the work W from being displaced due to a decrease in the clamping force, and performing an efficient clamping operation. The effect is obtained.

Further, the head 28a of the clamp bolt 28
Is set in the concave portion 38 of the clamp body 24, and the upper end surface 22a of the clamp arm 22 is arranged below the upper surface of the work W. For this reason, there is an advantage that various works can be smoothly performed without the workpiece W, for example, a cutting tool or the like, interfering with the clamp device 10.

Further, only by setting the shape of the lead groove 34, the turning angle of the clamp arm 22 can be set to the minimum angle that can avoid interference with the work W. Thereby, interference between the clamp devices 10 can be prevented. In particular, when a plurality of works W having complicated shapes are clamped on a single pallet 12, the clamp device 1 is used.
0 can be arranged as close as possible.

When the clamp of the work W by the clamp device 10 is released, the clamp bolt 28 is rotated by a nut runner (not shown) in a direction in which the clamp bolt 28 is loosened. Accordingly, the clamp body 24 pivots while moving upward under the guide action of the guide pin 46, the straight groove 36 and the lead groove 34 through the elastic force of the return spring 26, and the clamp arm 22 is used for attaching and detaching the work W. Evacuate to a position where it will not interfere.

[0027]

As described above, in the clamp device according to the present invention, the clamp body that supports the clamp arm has a cylindrical shape that is externally mounted on the clamp post, so that the entire clamp device can be reduced in size. The diameter of the clamp body can be increased. As a result, the rigidity of the clamp body itself is effectively improved, and in particular, it is possible to reliably prevent the clamp body provided with the clamp arm, which is a one-sided clamp, from falling or breaking. Therefore, a desired clamping force can be effectively applied to the work with a simple configuration, and an efficient and highly accurate clamping operation can be easily performed.

[Brief description of the drawings]

FIG. 1 is a plan view of a pallet incorporating a clamping device according to the present invention.

FIG. 2 is an exploded perspective view of the clamp device.

FIG. 3 is a longitudinal sectional view of the clamp device.

FIG. 4 is an explanatory view showing a state before tightening of a clamp bolt, and FIG. 4A is a plan view of the clamp device;
FIG. 4B is a partial longitudinal sectional view of the clamp device.

FIG. 5 is an explanatory view showing a state in which screwing of the clamp bolt is started, and FIG. 5A is a plan view of the clamp device;
FIG. 5B is a partial longitudinal sectional view of the clamp device.

6 is an explanatory view showing a state where the clamp bolt is further screwed, FIG. 6A is a plan view of the clamp device, and FIG. 6B is a partial longitudinal sectional view of the clamp device.

FIG. 7 is an explanatory view showing a state in which the tightening of the clamp bolt has been completed. FIG. 7A is a plan view of the clamp device, and FIG. 7B is a partial longitudinal sectional view of the clamp device.

FIG. 8 is a partial longitudinal sectional view of a clamp device according to the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Clamping device 12 ... Pallet 20 ... Clamp post 22 ... Clamp arm 24 ... Clamp body 26 ... Return spring 28 ... Clamp bolt 34 ... Lead groove 36 ... Straight groove 46 ... Guide pin

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Reiki Wachi 1-10-1 Shinsayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd.

Claims (2)

[Claims] A clamp post fixed to a pallet; a cylindrical clamp body externally mounted on the clamp post so as to be able to move forward and backward, and provided with a clamp arm for clamping a work on the pallet; A return spring interposed between the clamp body and the bias spring for urging the clamp arm away from the workpiece; and a clamp for pressing the clamp body against the clamp post against the return spring. A bolt hole is formed in the center of the clamp post, and a lead groove inclined in the circumferential direction is provided in an outer peripheral portion of the clamp post. A concave portion for accommodating a head of the clamp bolt is formed in a center portion of the clamp body, and a concave portion of the clamp body is formed. The periphery, the clamping device, characterized in that the guide pin engaging the lead groove is provided. 2. The clamping device according to claim 1, wherein a straight groove parallel to the axial direction is provided continuously on the outer periphery of the clamp post in the lead groove.