JP3428257B2 - Positioning clamp 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 positioning clamp device used for arranging and fixing a member at a predetermined position, and more particularly to arranging and fixing a panel material constituting an automobile body or the like at a predetermined position. The present invention relates to a technique effective when applied to a positioning clamp device.

[0002]

2. Description of the Related Art Conventionally, when arranging and fixing a panel material such as a thin iron plate at a predetermined position, as shown in FIG. 7, a locating pin (positioning pin) for positioning a positioning hole 51 provided in the panel material 50 is provided. The panel member 50 was fitted to the positioning member 52, and the periphery of the panel member 50 was fixed by the clamp device 53 so as to be positioned and fixed.

Further, as shown in FIG. 8, a handle-like engaging portion 54 having a positioning hole 51 is provided on the lower surface of the panel material 50, and the engaging portion 54, the locate pin 52 and the engaging claw 55 are provided. Panel material 5 using the clamp device 56 having
Positioning and fixing 0 was also performed. in this case,
The central portion of the panel material that the clamp device 53 does not reach can be clamped, and the panel material 50 can be positioned and fixed more reliably.

[0004]

However, in such a conventional positioning and fixing method, first, in the former method, the clamp position of the panel material 50 is determined, so that the shape and dimensions of the panel material 50 can be changed. There was a problem that we could not respond flexibly.

On the other hand, the latter method can deal with the change of shape and the like relatively flexibly, but there is a problem that the locate pin 52 has to be lengthened because the vertical stroke of the locking claw 55 is large. . Therefore, in order to avoid the interference between the locate pin 52 and the work, the dimension of the locking portion 54 must be set according to the length of the locate pin 52, and not only the panel material 50 but also the design of the product using it. There was an adverse effect of affecting even.

An object of the present invention is to provide a clamp device which has a short locating pin length and which allows flexibility in product design.

The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

[0008]

Among the inventions disclosed in the present application, a brief description will be given to the outline of typical ones.
It is as follows.

That is, the positioning clamp device of the present invention has a contact surface at the tip with which the fixed member comes into contact, and a positioning pin protruding from this contact surface and fitted with a positioning hole formed in the fixed member. It has an outer cylindrical body and an inner cylindrical body that is mounted in the outer cylindrical body and is connected to a drive means to move forward and backward in the axial direction. A driven member which is biased and whose forward limit position is restricted with respect to the inner cylindrical body, and is housed in an opening groove formed in the positioning pin and is swingably mounted on the driven member by a fulcrum pin,
A clamp arm having a claw for clamping the fixed member between the contact surface and the contact surface. Then, after the inner cylinder has moved forward toward the tip to a predetermined stroke, a stopper that restricts the forward movement of the driven member to allow only the inner cylinder to move, and the stopper restricts the forward movement of the driven member. And a cam member for converting the forward movement of the inner tubular body into the swinging movement of the clamp arm when the inner tubular body moves forward under such a state. Then, by operating the driving means, the clamp arm is operated in the opening groove of the positioning pin to fix the fixed member at a predetermined position.

In this case, the stopper may include the fulcrum pin and a loose fitting groove formed in the outer cylindrical body for loosely fitting the fulcrum pin. In addition, the cam member, a cam portion formed on the clamp arm,
It is also possible to have a configuration including a cam follower that engages with the cam portion and that interlocks with the inner cylindrical body. Further, a plurality of clamp arms may be provided.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a sectional view showing the construction of a positioning clamp device according to an embodiment of the present invention, and FIGS. 2 and 3 are perspective views showing the outer shapes of the components. In the present embodiment, for convenience, the left side of the clamp device 1 in FIG. 1 is referred to as the front end (side) and the right side is referred to as the rear end (side).

As shown in FIG. 1, a clamp device (positioning clamp device) 1 according to the present embodiment has a substantially cylindrical shape having a locate pin (positioning pin) 2 at its tip and a clamp arm 3 incorporated therein. The device is a device for actuating the clamp arm 3 and positioning and fixing a work (fixed member) such as a panel material by a pneumatic cylinder 20 as a driving means.

In the clamp device 1, a locate pin 2 having a predetermined size is first provided at the tip of the locate pin retainer 11. This locate pin 2
This is for fitting a positioning hole provided on the work side to place the work at a predetermined position, and the fitting portion 2a is formed to have a predetermined outer diameter so as to fit with the positioning hole of the work. . Further, the tip portion 2b is formed in a taper shape so that the locate pin 2 can be easily fitted into the positioning hole. Further, an opening groove 2c is formed inside the locate pin 2 so that the clamp arm 3 can be retractably housed therein. On the other hand, a contact surface 11a is formed on the tip end side of the locate pin retainer 11, and the workpiece fitted with the locate pin 2 has the contact surface 1a.
It is clamped by the clamp arm 3 while being in contact with 1a.

An outer cylinder 4 is attached to the rear end of the locate pin 2. The outer cylindrical body 4 is a cylindrical component that constitutes a part of the outer shape of the clamp device 1, and as can be seen from FIG. 4, a first side on which a cam pin (cam follower) 14 described later is loosely fitted. Long hole 4a
And a second elongated hole (freely fitting groove) 4 into which the fulcrum pin 13 is loosely fitted.
b is provided. In this case, the second elongated hole 4b is formed on the same center line as the first elongated hole 4a and has a shorter dimension than the first elongated hole 4a. In addition, one set of both long holes 4a and 4b is provided on the surface opposite to the side shown in FIG.

On the other hand, the clamp arm 3 is accommodated inside the outer cylindrical body 4 in a state of being attached to the driven member 5 and the inner cylindrical body 6 by the cam pin 14 and the fulcrum pin 13, and by these functions, The clamp arm 3 operates so as to move to a work clamp position or an arm storage position. In the present embodiment, the locate pin retainer 11 and the outer cylinder body 4 are separately provided, but the outer cylinder body 4 and the locate pin 2 are integrally formed to be formed on the outer cylinder body 4. The workpiece may be brought into contact with the contact surface.

Here, the clamp arm 3 is a work clamp component having a claw portion (claw) 3a at its tip,
A cam hole (cam portion) 15 into which the cam pin 14 is inserted is formed in the substantially central portion, and the cam pin 14 is formed in the cam hole 1.
By moving the inside of 5, it moves to the work clamp position or the arm storage position. In the present embodiment, the clamp arm 3 is provided with two claw portions 3a, which are upward and downward in FIG.

As shown in FIG. 1, the clamp arm 3 is arranged inside the outer cylindrical body 4 so as to fit in the slit 6a (see FIG. 3) of the inner cylindrical body 6. Also, the fulcrum pin 13
Is swingably coupled to the driven member 5 and is also connected to the inner cylindrical body 6 by inserting the cam pin 14 into the cam hole 15. Here, the cam hole 15 is formed in a state of being inclined toward the claw portion 3a toward the tip end direction, and as the cam pin 14 moves through the cam hole 15 and moves toward the tip end side, the clamp arm 3 is The claw portion 3a swings around the fulcrum pin 13 in the direction in which the claw portion 3a is drawn into the locate pin 2.

Next, the driven member 5, as shown in FIG.
It is a short columnar part having a step portion 5a, and as shown in FIG. 1, the inner cylindrical body 6 with the clamp arm 3 attached thereto.
It can be attached to the inside of the so as to move back and forth. Further, a slit portion 5b for attaching the clamp arm 3 is formed on one end side thereof. In this case, the clamp arm 3 is swingably attached about the fulcrum pin 13 in the slit portion 5b by fitting the fulcrum pin 13 into the fulcrum pin hole 5c.

On the other hand, the driven member 5 is formed with a stepped portion 5a, which engages with the stepped portion 6b formed inside the inner cylindrical body 6 to restrict the forward limit position with respect to the inner cylindrical body 6. It has become so. The small diameter portion 5d is formed in such a size that it is slidably fitted to the inner side surface of the inner cylindrical body 6. Further, a recess 5e for receiving a spring is formed on the end surface of the driven member 5 on the rear end side. As shown in FIG. The member 5 is attached to the inner side of the inner cylindrical body 6 while being always biased toward the tip end side.

The inner cylindrical body 6 is a cylindrical part as shown in FIG. 3, and a slit portion 6a for mounting the clamp arm 3 is formed on one end side thereof. Also,
The outer diameter is formed so as to be fitted to the inner side surface of the outer cylindrical body 4 so as to be movable back and forth in the axial direction, and is arranged inside the outer cylindrical body 4 with the clamp arm 3 attached. . Further, a step 6b is formed inside thereof,
The driven member 5 is engaged there. In addition, a female screw portion 6c is formed on the rear end side, and is connected to the pneumatic cylinder 20 via the connecting member 7 by this.

On the other hand, on the side surface of the inner cylinder body 6,
A cam pin hole 6d and an elongated hole-shaped fulcrum pin hole 6e formed on the same center line as the cam pin hole 6d are provided. Then, while the clamp arm 3 is sandwiched in the slit portion 6a, the cam pin 14 is fitted in the cam pin hole 6d, and the fulcrum pin 13 is loosely fitted in the fulcrum pin hole 6e, whereby the clamp arm 3 is driven. It is mounted in the inner cylindrical body 6 together with the member 5.

As described above, the clamp arm 3 has the second elongated hole 4 with the driven member 5 accommodated in the inner cylindrical body 6.
b, the fulcrum pin 13 through the fulcrum pin holes 5c and 6e, and the cam pin 14 through the first elongated hole 4a and the cam hole 15.
Is attached to the inside of the outer cylindrical body 4 in a form accommodated in the slit portion 6a and the slit portion 5b.

On the other hand, the connecting member 7 is a component for connecting the inner cylindrical body 6 and the piston rod 21, and has a male screw portion 7a screwed into the female screw portion 6c of the inner cylindrical body 6 and a male screw portion 21a of the piston rod 21. And a female screw portion 7b that is screwed into the. As a result, the inner cylinder body 6 is coupled to the piston rod 21 via the connecting member 7, and moves in the outer cylinder body 4 and the mount block 12 in the axial direction as the pneumatic cylinder 20 operates. A pressing spring 8 is provided between the connecting member 7 and the driven member 5 as described above, and always urges the driven member 5 toward the distal end side.

By the way, in the present embodiment, the pneumatic cylinder 20 is used as the driving means. In this pneumatic cylinder 20, a piston 23 having a piston rod 21 is provided in a cylinder tube 22, and this is operated by air pressure to operate the clamp arm 3. The pneumatic cylinder 20 includes a magnet 24 for detecting the cylinder position and a piston 23.
A support 27 having a bumper 26 for preventing a collision with the bush 25 is also provided.

The above-mentioned parts are made of metal such as iron and aluminum in principle except the bumper 26 and other packing parts, but they may be made of synthetic resin in consideration of the load level and cost. It is possible.

Next, the operation of the clamp device 1 of this embodiment will be described. 4 to 6 are partial cross-sectional views showing an operating state of the clamp device 1. FIG. 4 shows a state in which the work 10 is clamped, and FIG. 5 shows a state in which the clamp arm 3 is detached from the work 10 and raised. 6 shows the state when the clamp arm 3 is stored, and FIG.

First, in the case of the work clamp state, the piston 23 moves to the rear end side, and as shown in FIG. 4, the clamp arm 3 moves the work 10 between the claw portion 3a and the contact surface 11a of the locate pin retainer 11. Clamp between. At this time, the locate pin 2 is fitted in the positioning hole 10a of the work 10, and the work 10 is positioned and fixed at a predetermined position.

When releasing the work 10 from such a state, first, the pneumatic cylinder 20 is operated to move the piston 23 to the tip side. Along with this, the piston rod 21 also moves to the tip side, and along with this, the inner cylindrical body 6 also moves to the tip side. Further, the driven member 5 also tries to move to the tip side together with the inner cylindrical body 6 while being engaged with the inner cylindrical body 6 by the pressing force of the pressing spring 8. Here, as can be seen from FIG. 4, the fulcrum pin 13 fitted to the driven member 5 is
Since the forward movement of the driven member 5 is not restricted by the second elongated hole 4b, the movement of the driven member 5 in the axial direction is not hindered. Therefore, in this case, the driven member 5 also moves to the front end side together with the inner cylindrical body 6.

On the other hand, since the driven member 5 and the inner cylindrical body 6 move together and the relative positional relationship between the two does not change, the cam pin 14 does not change its position in the cam hole 15 and then moves to the first position. The first elongated hole 4a moves to the tip side. Therefore,
The clamp arm 3 moves straight in the axial direction without swinging, and the claw portion 3 a also moves in the opening groove 2 c of the locate pin 2 and is separated from the work 10. As described above, in the present clamping device 1, the clamp arm 3 is vertically mounted on the work 1
Since the work piece 10 is separated from 0, the work piece 10 can be released from the clamp device 1 without damaging the work piece 10 by the claw portion 3a.

When the clamp arm 3 moves toward the tip side in this way, the fulcrum pin 13 eventually moves to the second elongated hole 4b.
Abutting on the end portion on the tip side of. FIG. 5 shows the state at this time. At this time, since the forward movement of the fulcrum pin 13 is restricted by the second elongated hole 4b and cannot move further toward the tip side, the driven member 5 cannot move further toward the tip side. Therefore, the clamp arm 3 attached to the driven member 5 by the fulcrum pin 13 cannot move further to the tip end side, and this state is the position where the clamp arm 3 moves (raises) to the tip end side most.

Even at this time, since the cam pin 14 is still in the loosely fitted state in the first elongated hole 4a, the inner cylindrical body 6 fitted with the cam pin 14 can be moved further toward the tip side. Is left. Further, in this case, since the fulcrum pin hole 6e of the inner cylinder body 6 is formed in a long hole shape, the movement of the inner cylinder body 6 is not hindered even when the fulcrum pin 13 is stopped, and only the inner cylinder body 6 is prevented. The movement is allowed. That is, the fulcrum pin 13 and the second elongated hole 4b are
It functions as a stopper that restricts the forward movement of the driven member 5 and allows only the inner cylindrical body 6 to move.

Next, when the piston 23 is further moved to the tip side, the inner cylindrical body 6 is further moved to the tip side together with the piston rod 21. In this case, as can be seen from FIG. 5, since the driven member 5 cannot move any further, only the inner cylindrical body 6 moves toward the tip side. Further, like the inner cylinder body 6, the cam pin 14 also moves inside the first elongated hole 4a toward the tip end side. Then, the cam pin 14 eventually comes into contact with the tip end portion of the first elongated hole 4a, and FIG. 6 shows the state at this time.

In this case, the inner cylindrical body 6 moves toward the tip side, while the driven member 5 cannot move from the state shown in FIG. 5, so that the relative positional relationship between the driven member 5 and the inner cylindrical body 6 is as follows. Changes. That is, the relative positional relationship between the clamp arm 3 coupled to the driven member 5 and the cam pin 14 coupled to the inner cylindrical body 6 is also changed, and the cam pin 14 has the cam hole 1
It moves in the first elongated hole 4a while moving to the tip side in 5. Therefore, the clamp arm 3 has the cam hole 1
It swings around the fulcrum pin 13 while being guided by 5, and is housed inside the opening groove 2c of the locate pin 2. That is, the cam pin 14 and the cam hole 15 are arranged so that the inner cylindrical body 6 is prevented from moving under the condition that the forward movement of the driven member 5 is restricted.
Functions as a cam member that converts the forward movement of the inner cylindrical body 6 into the swinging movement of the clamp arm 3 when the forward movement of the clamp arm 3 is performed.

On the other hand, from the state shown in FIG.
When clamping the piston, conversely to the previous case, the piston 2
3 is moved to the rear end side. At this time, the current state of the driven member 5 is maintained by the pressing force of the pressing spring 8, and only the inner cylindrical body 6 moves to the rear end side. Then, with the movement of the inner cylindrical body 6,
The cam pin 14 moves in the first long hole 4a while moving to the rear end side in the cam hole 15, and the clamp arm 3 swings in the opposite direction to the state shown in FIG.

Further, when the piston 23 is moved to the rear end side, as shown in FIG. 5, the inner cylinder 6 and the driven member 5 are moved.
Since the and are engaged, the inner cylindrical body 6 moves to the rear end side, and at the same time, the driven member 5 also moves to the rear end side. Then, the fulcrum pin 13 also moves to the rear end side in the second elongated hole 4b, and the clamp arm 3 also moves to the rear end side. In this case, as described above, since the relative position of the driven member 5 and the inner cylindrical body 6 does not change, the cam pin 14 does not change its position in the cam hole 15 and does not change its position. The hole 4a moves to the rear end side. Therefore, the clamp arm 3 moves straight from the position shown in FIG. 5 to the position shown in FIG.

As described above, according to the clamp device 1 of the present invention, the work 10 can be clamped and released in a short stroke, and the work of the clamp arm 3 does not damage the work 10.

Although the invention made by the present inventor has been specifically described based on the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say.

For example, in the above-described embodiment, the outer cylinder 4 is provided with the first elongated hole 4a into which the cam pin 14 is loosely fitted. However, this first elongated hole 4a is not always necessary for its function. However, it is possible to omit this. Further, as the cam member, the combination of the cam pin 14 and the cam hole 15 is used in the above-mentioned embodiment, but the configuration is not limited to this. For example, the cam hole is provided on the inner cylinder 6 side, and You may make it fit the protrusion provided in the clamp arm 3.

Further, although the number of the clamp arms 3 is two in the above-mentioned embodiment, the number is not limited to two, and any number such as one, three, four or the like can be set. be able to. Further, in the present embodiment, the directions of the claw portions 3a are also opposite to each other, but both of them may be arranged side by side on the same side.

In the above description, the invention mainly made by the present inventor is applied to a clamp device using a pneumatic actuator as a driving means, which is the field of use thereof, but the invention is not limited to this. For example, the present invention can be applied to a device that uses a fluid pressure actuating device such as a hydraulic actuating device as a driving means, or an electric clamp device.

[0042]

The effects obtained by the typical ones of the inventions disclosed in the present application will be briefly described as follows.
It is as follows.

(1) In the opening groove formed in the locate pin, construct a mechanism that combines an outer cylinder, an inner cylinder, a driven member, a stopper, a cam member, etc., and operate the clamp arm using the mechanism. Thus, there is an effect that the work can be clamped and released with a short stroke. Therefore, the length of the locate pin can be shortened, and the degree of freedom in designing not only the work itself but also a product using the work can be increased.

(2) The mechanism has an effect that the clamp arm can be operated straight along the axial direction. Therefore, the work can be clamped and released without damaging the work.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a positioning clamp device according to an embodiment of the present invention.

2 is a perspective view showing an outer shape of a driven member used in the positioning clamp device of FIG. 1. FIG.

FIG. 3 is a perspective view showing an outer shape of an inner cylindrical body used in the positioning clamp device of FIG.

FIG. 4 is a partial cross-sectional view showing a state of the positioning clamp device of FIG. 1 during work clamping.

5 is a partial cross-sectional view showing a situation when the clamp arm of the positioning clamp device of FIG. 1 is raised.

FIG. 6 is a partial cross-sectional view showing a situation when the positioning clamp device of FIG. 1 is accommodated in a clamp arm.

FIG. 7 is an explanatory diagram showing a conventional work clamping method.

FIG. 8 is an explanatory diagram showing a conventional work clamping method.

[Explanation of symbols]

1 Clamp device (positioning clamp device) 2 Locating pin (positioning pin) 2a Fitting part 2b tip 2c opening groove 3 clamp arm 3a Claw (nail) 4 outer cylinder 4a First long hole 4b Second long hole (free fitting groove, stopper) 5 Follower 5a step 5b slit part 5c Support pin hole 5d small diameter part 5e recess 6 Inner cylinder 6a slit part 6b step 6c Female thread 6d cam pin hole 6e Support point pin hole 7 Connection member 7a Male thread 7b Female thread 8 pressure spring 10 work 10a Positioning hole 11 Locate pin retainer 11a contact surface 12 mount blocks 13 fulcrum pin (stopper) 14 Cam pins (cam followers, cam members) 15 Cam hole (cam part, cam member) 20 Pneumatic cylinder (drive means) 21 piston rod 21a Male thread part 22 Cylinder tube 23 pistons 24 magnets 25 bush 26 Bumper 27 Support 50 panel materials 51 Positioning hole 52 Locating pin 53 Clamp device 54 Locking part 55 Locking claw 56 Clamping device

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B23Q 3/06 B23Q 3/18 F16B 1/02

Claims (4)

(57) [Claims] 1. An outer cylindrical body having a contact surface at a tip with which a fixed member contacts, and a positioning pin protruding from the contact surface and fitted with a positioning hole formed in the fixed member; An inner cylindrical body that is mounted in the cylindrical body and is connected to the driving means to move forward and backward in the axial direction; and an inner cylindrical body that is movably mounted in the forward and backward directions and is urged in the forward direction and forwardly movable with respect to the inner cylindrical body. A driven member whose position is regulated, and a driven member that is housed in an opening groove formed in the positioning pin and is swingably attached to the driven member by a fulcrum pin, and that fixes the fixed member between the contact surface. A clamp arm having a claw for clamping, and a screw that restricts the forward movement of the driven member after the inner cylinder has moved forward toward the tip to a predetermined stroke, and allows only the inner cylinder to move. When the inner cylindrical body moves forward under the condition that the forward movement of the driven member is restricted by the lid and the stopper, the forward movement of the inner cylindrical body is converted into the swing motion of the clamp arm. A positioning clamp device, comprising: 2. The clamp device according to claim 1, wherein
The positioning clamp device is characterized in that the stopper includes the fulcrum pin and a loose fitting groove formed in the outer cylindrical body for loosely fitting the fulcrum pin. 3. The clamp device according to claim 1, wherein the cam member has a cam portion formed on the clamp arm, and a cam follower that engages with the cam portion and interlocks with the inner cylindrical body. A positioning clamp device having: 4. The clamp device according to claim 1, wherein the clamp device comprises a plurality of the clamp arms.