JPH08200312A - Clamp cylinder device - Google Patents

Abstract

PURPOSE: To provide a clamp cylinder device which can set a work simply without being affected by a clamp lever by suppressing projection of the clamp lever from a cylinder body in an unclamped state. CONSTITUTION: A clamp cylinder device 10 is composed of a cylinder mechanism 18 and a clamp mechanism 24. The clamp mechanism 24 has base plates 56a, 56b connected to a cylinder body 14, a clamp lever 22 journalled rotatably by a specified angle, abutting against a work W for holding it, first to third support shafts 60a to 60c displaced integrally with a piston rod 20 and rotatably journalling the clamp lever 22, first and second guide holes 52, 54 for guiding the first to third support shafts 60a to 60c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp cylinder device for holding and fixing a work.

[0002]

2. Description of the Related Art Clamping means is used to position and fix a thin plate-shaped work, which is superposed on a jig, by welding with a welding gun. As this kind of clamping means, for example, the actual flat plate 1-128.
A clamp cylinder is disclosed in Japanese Patent Publication No. 981 and Japanese Patent Laid-Open Publication No. 49-54244.

The clamp cylinder according to this prior art is
The piston rod has a piston rod that moves forward and backward under the action of pressure fluid supplied to the cylinder chamber in the cylinder body, and a clamp lever is connected to one end of the piston rod via a link so as to be rotatable by a predetermined angle. The work is held by a lever.

The clamp lever is formed so as to project from one end of the cylinder body to the outside, and is rotated by a predetermined angle with a support shaft or pin pivotally attached to one end of the clamp lever as a fulcrum under the urging action of the cylinder. By doing so, a clamped state in which the workpiece is held is obtained, and on the other hand, by rotating the clamp lever from the clamped state by a predetermined angle in the direction away from the workpiece, the clamp lever returns to the original position and becomes the unclamped state.

[0005]

In the clamp cylinder according to the above-mentioned prior art, the rotation range of the clamp lever is set to a predetermined range with the spindle or pin fixed to the cylinder body as the center point. Therefore, even when the machining process for the workpiece held in advance is completed and the workpiece is in the unclamped state, the clamp lever is in a state of protruding from the cylinder body to the outside. There is an inconvenience that it is difficult to set the work because the clamp lever interferes when setting the work on the tool.

The present invention has been made in order to overcome the above-mentioned inconvenience, and in the unclamped state, the clamp lever is prevented from protruding from the cylinder body, so that the clamp lever can be simply and conveniently without any hindrance. An object of the present invention is to provide a clamp cylinder device capable of setting a work.

[0007]

To achieve the above object, the present invention comprises a cylinder mechanism and a clamp mechanism, wherein the cylinder mechanism has a cylinder body defining a set of pressure fluid inlet / outlet ports. And a piston that reciprocates in a cylinder chamber defined in the cylinder body, and a piston rod that is engaged with the piston and that is integrally and linearly displaced with the piston. A casing connected to the cylinder body, an arm member pivotally supported by a predetermined angle so as to be rotatable, and an arm member that comes into contact with a work and holds the work; and a body that is integrally displaced together with the piston rod and rotates the arm member. The arm member includes a pivotally supporting means for movably supporting the shaft and a guide means for guiding the shaft supporting means. Characterized by retractable displaced in the casing with a predetermined angle rotation displaces the stage as a fulcrum.

[0008]

In the above clamp cylinder device according to the present invention, the pressure fluid is supplied to the cylinder chamber through one pressure fluid inlet / outlet port, and the piston rod engaged with the piston is linearly moved under the action of the pressure fluid. Shift to. In this case, the shaft support means is integrally displaced together with the piston rod, and the arm member pivotally supported by the shaft support means is rotated by a predetermined angle under the guide action of the guide means to hold the workpiece. It becomes a state.

Next, pressure fluid is supplied to the cylinder chamber through the other pressure fluid inlet / outlet port, and the piston rod is displaced in the opposite direction to the above. In this case, the arm member pivotally supported by the shaft support means is separated from the workpiece by the guide action of the guide means and is rotationally displaced by a predetermined angle in the opposite direction to the above, and the arm member is housed in the casing. It returns to its original position and becomes unclamped.

[0010]

The preferred embodiments of the clamp cylinder device according to the present invention will now be described in detail with reference to the accompanying drawings.

1 to 5 are partial sectional views of a clamp cylinder device according to an embodiment of the present invention.

The clamp cylinder device 10 basically has a piston 1 housed in a cylinder body 14 under the action of a pressure fluid supplied to the cylinder chambers 12a and 12b.
6 and a cylinder mechanism 18 for reciprocating the cylinder 6, and a clamp lever 22 (arm member) is rotated by a predetermined angle under the forward / backward movement of a piston rod 20 which is integrally formed with the cylinder mechanism 18 and is engaged with the piston 16. And a clamp mechanism 24 for holding the workpiece W.

The cylinder mechanism 18 includes a cylinder body 14
And a head cover 2 that is fixed to both ends of the cylinder body 14 and substantially defines the cylinder chambers 12a and 12b.
6 and the rod cover 28, and a pair of pressure fluid inlet / outlet ports 30a, 30 defined in the cylinder body 14, respectively.
b, a piston 16 slidingly displaced in the arrow X or Y direction in the cylinder chambers 12a, 12b, and the piston 16
And a piston rod 20 connected thereto. It should be noted that the cylinder chambers 12a, 12 are provided at the fitting portions of the head cover 26 and the rod cover 28 with respect to the cylinder body 14.
an annular seal member 32a for maintaining the airtightness of b,
32b is mounted.

A substantially cylindrical collar 34 is displaceably attached to the inner wall of the cylinder body 14 at a position spaced a predetermined distance from the rod cover 28 defining one of the cylinder chambers 12a toward the center side (arrow Y side). It has been inserted. That is, the collar 34 is slidably arranged along the inner wall of the cylinder body 14, and has a gap 36 defined between the outer peripheral surface of the piston rod 20 and the hole penetrating the collar 34. It is in a loosely fitted state. Therefore, through the gap 36, the space defined by the piston 16 and the collar 34, and the collar 34 and the rod cover 2
The cylinder chamber 12 communicates with the space defined by 8.
a is configured.

Further, the rod cover 28 of the collar 34
An annular recess 38 is defined on the negative side, and a hook member (not shown) for locking one end of the spring member 40 is provided in the annular recess 38. Meanwhile, an annular recess 42 is defined in the rod cover 28 facing the collar 34, and a hook member (not shown) provided in the annular recess 42.
Thus, the other end of the spring member 40 is locked while being hooked. The collar 34 can be arranged at a desired position by selecting the length and elastic force of the spring member 40 to be predetermined values.

In this way, both ends of the spring member 40 are locked by a set of hook members (not shown), and the set of hook members are respectively attached to the rod cover 28 and the collar 3.
It is fitted in annular recesses 38, 42 defined in FIG. Therefore, when the collar 34 is in the free state, the collar 16 is locked via the spring member 40 at a position separated from the rod cover 28 by a predetermined distance toward the center side, and the piston 16 is displaced in the arrow X direction, By contacting the collar 34, the collar 34 receives a pressing force in the arrow Y direction due to the elastic force of the spring member 40. The elastic force of the spring member 40 is set so that the collar 34 is pressed in the direction of the arrow Y so as to press the collar 34 from the position shown in FIG. 5 to the position shown in FIG. Has been done.

The cylinder chambers 12a, 12b are divided by a piston 16 into one cylinder chamber 12a and the other cylinder chamber 12b, and the one cylinder chamber 12a.
Communicates with the pressure fluid inlet / outlet port 30a via an orifice, and the other cylinder chamber 12b communicates with the pressure fluid inlet / outlet port 30b via an orifice. In this case, the piston 16 has one cylinder chamber 12a and the other cylinder chamber 1
A piston motion is performed by reciprocating with 2b.

The piston 16 has a portion 44 having a large pressure receiving area for the pressure fluid (hereinafter referred to as a large portion) and a portion 46 having a small pressure receiving area (hereinafter referred to as a small portion). The large portion 44 and the small portion 46 of the piston 16 differ from each other in the pressure receiving area substantially by the vertical sectional integration of the piston rod 20. A ring-shaped piston packing 48, a magnet 50, and a gasket 51 are fitted to the side peripheral surface of the piston 16 with a predetermined gap therebetween, respectively, through an annular groove.

The piston packing 48 functions as a check valve, and as shown in FIG. 8, a plurality of recesses 49 are formed on both the front and back surfaces of the ring body at predetermined intervals. . Further, a tongue piece 55 that is bent outward in the radial direction is provided on the inner peripheral side of the piston packing 48, and a curved portion 59 that slidably contacts the inner wall surface of the cylinder body 14 is formed on the outer peripheral surface thereof. . For details of the piston packing 48, refer to Japanese Patent Application No. 6-126379 filed by the present applicant. In addition, a ring-shaped damper member 53 formed of natural or synthetic rubber is fixed to the shoulder portion on the outer peripheral side of the large portion 44 of the piston 16.

Next, in the clamp mechanism 24, the first guide hole 52 and the second guide hole 54 are defined in parallel so as to be close to each other, and a pair of substantially flat plates are assembled in a state of facing each other with a predetermined gap therebetween. Substrates (casing) 56a, 56
b, a pair of side plates 57a, 57b (see FIG. 6) interposed between the pair of substrates 56a, 56b, and the first
First to third guide rollers 58a to 58c which are rotationally displaced along the guide hole 52 and the second guide hole 54, and the first to third guide rollers 58a to 58c which are spaced apart from each other by a predetermined distance.
First to third support shafts 60 rotatably attached to both ends thereof
a to 60c and a pair of substantially elliptical support plates 62a and 62b provided between the pair of substrates 56a and 56b and integrally supporting the second and third support shafts 60b and 60c,
The first guide roller 58a and the second guide roller 5
Clamp lever 2 that is integrally connected to a supporting member 64 that supports 8b and that abuts against work W and holds it.
Including 2 and. Note that the first guide hole 52, the second guide hole 54, and the first to third guide rollers 58a to 58c that are rotationally displaced along the first and second guide holes 52 and 54.
Serves as a guide means. The pair of substrates 56a and 56b are integrally connected to the end portion of the cylinder body 14 on the rod cover 28 side via a tie rod (not shown). Further, the first guide hole 5
2 and the second guide hole 54 are provided on the respective substrates 56a, 56.
a pair of cover plates 65a, 65 screwed to b
It is closed by b (see FIGS. 6 and 7).

The pair of substrates 56a and 56b each have a linear first guide hole 52 extending a predetermined length along the longitudinal direction, and end portions bent toward the work W side by a predetermined angle, and are substantially formed. A second guide hole 54 having an L shape is defined,
Along the first guide hole 52, a first guide roller 58a
Is displaced, and the second and third guide rollers 58b, 58c are integrally displaced along the second guide hole 54. Also,
A mounting member 68 is fixed to one side surface of the clamp mechanism 24 via a screw member 66, and a clamp lever 22 that is rotationally displaced is guided to a clamped state at a portion adjacent to the mounting member 68. A damper member 70 that is in contact with the clamp lever 22 and has a function of reducing the impact on the work W is fixed. The clamp cylinder device 10 is fixed to the jig G for welding the work W by a welding gun (not shown) via the attachment member 68.

First to third guide rollers 58a to 58a are provided at both ends of the first to third support shafts 60a to 60c along the axial direction.
58c are rotatably and pivotally mounted at predetermined intervals.
In this case, the second support shaft 60 is attached to the tip of the piston rod 20.
b is rotatably connected, and the third support shaft 60c is similarly displaced as the piston rod 20 moves forward and backward. Further, the second and third support shafts 60b and 60c are respectively supported by hole portions 72a and 72b defined by a pair of support plates 62a and 62b facing each other with a predetermined distance therebetween, and the second and third support shafts 60b and 60c are respectively supported. A second shaft that is pivotally attached to the support shafts 60b and 60c, respectively.
And the third guide rollers 58b and 58c correspond to the support plate 6
They are integrally displaced via 2a and 62b. The second support shaft 60b is loosely fitted with a play portion in the hole 72a defined by the support plates 62a and 62b, and the third support shaft 60c
Is fitted into the holes 72b of the support plates 62a and 62b via the rotation stopping means 74.

The first and third support shafts 60a, 60c
Are integrally supported by a support member 64 provided between the pair of support plates 62a and 62b. Therefore, the first and third support shafts 60a and 60c are respectively attached to the first shaft.
And the third guide rollers 58a and 58c are integrally displaced. The third support shaft 60c is loosely fitted with a play portion in the hole 76 defined in the support member 64, and the first support shaft 60a is supported by the support member 64 through the rotation stopping means 78.
It is fitted in the hole 80 of the.

Clamp cylinder device 10 according to the present embodiment
Is basically configured as described above. Next, its operation and action and effect will be described.

First, when the clamp cylinder device 10 is in the initial position shown in FIG. 1 in advance, one pressure fluid inlet / outlet port 30 is supplied from the pressure fluid supply means (not shown).
A pressure fluid is supplied to one cylinder chamber 12b via b. The other pressure fluid inlet / outlet port 30a is opened to the atmosphere under the switching action of a switching valve (not shown).

The pressure fluid introduced into the one cylinder chamber 12b is received by the large portion 44 of the piston 16, and the pressure fluid passes through the piston packing 48 to the other cylinder chamber 12a on the piston rod 20 side. Therefore, the one cylinder chamber 12b and the other cylinder chamber 12a are in communication with each other, and are kept at the same pressure.

That is, the tongue piece 5 of the piston packing 48 is produced by the action of the pressure fluid flowing in through the recess 49.
5 bends outward in the radial direction. Therefore, the tongue piece 55 is separated from the seating portion (not shown) of the annular groove into which the piston packing 48 is fitted to define a gap, and the pressure fluid passes through the piston packing 48 through the gap. As a result, one cylinder chamber 12b and the other cylinder chamber 12a are in communication with each other.

The piston 16 moves in one end direction (direction of arrow X) of the moving process due to the difference in pressure receiving area between the portion 44 having a large pressure receiving area and the portion 46 having a small pressure receiving area. In this case, when the piston 16 moves toward the one stroke end side, the piston 16 moves due to the difference in pressure receiving area, so that the pressing force of the piston 16 can be reduced. The pressure fluid that has flowed into the other cylinder chamber 12a is discharged to the outside from the pressure fluid inlet / outlet port 30a via the orifice.

As the piston 16 moves, the second support shaft 60b connected to the tip of the piston rod 20 is pressed in the direction of the arrow X, and the second and third support shafts 60 are moved.
a pair of support plates 62a and 62b for supporting b and 60c, respectively.
Also, the first guide roller 58a is linearly displaced along the first guide hole 52 through the support member 64 that supports the first and third support shafts 60a and 60c, respectively, and the second and third guide rollers 58b are formed. , 58c are linearly displaced along the second guide hole 54. At that time, the clamp lever 22 connected to the support member 64 is linearly displaced along the arrow X direction, similarly to the first and third guide rollers 58a and 58c.

In the process of the piston rod 20 moving in the direction of the arrow X under the action of the pressure fluid, the first guide roller 58a reaches the end portion of the first guide hole 52, so that the first guide roller 58a is Further displacement is prevented (see FIG. 2). In this case, the third guide roller 58c is displaced along the curved portion of the second guide hole 54 with the first support shaft 60a to which the first guide roller 58a is attached as a fulcrum, and is connected to the support member 64. The clamp lever 22 rotates in the arrow direction with the first support shaft 60a to which the first guide roller 58a is attached as a fulcrum (see FIG. 3).

Therefore, as shown in FIG. 4, immediately before the piston 16 reaches the end of the moving process, the gasket 51 provided in the small portion 46 abuts on the collar 34 to maintain the abutting state. Meanwhile, the piston 16 presses the collar 34 in the arrow X direction. In this case, the gasket 51 comes into contact with the collar 34, so that the piston packing 48 is closed and the communication state between the one cylinder chamber 12b and the other cylinder chamber 12a is interrupted.
Therefore, one cylinder chamber 12b and the other cylinder chamber 1
A pressure difference is generated between the piston 2 and 2a, and the force for pressing the piston 16 in the arrow X direction increases due to the pressure difference. In addition,
The elastic force of the spring member 40 presses the piston 16 in the arrow Y direction on the collar 34, but as described above, the elastic force of the spring member 40 is a minute force. Can be ignored from.

After all, in the process of reaching the end position of the movement process of the piston 16, the piston packing 48 is opened and the piston chamber 12b and the other cylinder chamber 12a have the same pressure, as compared with the case where the piston packing 48 is opened. The closing of the packing 48 increases the force with which the pressure fluid presses the piston 16. It should be noted that the third guide roller 58c, which is displaced along the curved portion of the second guide hole 54, serves as the second guide hole 54.
When the end point is reached, the clamp lever 22 comes into contact with the work W, and the work W is held in a clamped state.

As described above, in the clamp cylinder device 10 according to the present embodiment, in the process of moving the piston 16 from the starting position to the end position of the moving process, the piston 16 is moved.
The force for pressing is increased, and the increased pressing force is transmitted to the clamp lever 22. As a result, the work W is securely held by the clamp lever 22, and the welding work on the work W is performed by the welding gun (not shown).

After the welding work on the work W is completed,
When the clamp lever 22 is rotated in the opposite direction to return to the original position, pressure fluid is supplied to the other cylinder chamber 12a through the other pressure fluid inlet / outlet port 30a under the switching action of the switching valve (not shown). To do. The piston 16 is driven by the pressure fluid introduced into the other cylinder chamber 12a.
Is pressed and the piston 16 is displaced in the direction of the arrow Y.
In this case, under the displacement action of the piston 16, the first to third guide rollers 58a to 58c are displaced along the first guide hole 52 and the second guide hole 54 and returned to the original position shown in FIG. It becomes unclamped. At that time, the clamp lever 22 rotates about 90 ° about the first support shaft 60a as a fulcrum, and then is displaced in the same direction as the displacement direction of the piston 16 (direction of arrow Y). Therefore, the predetermined range of the clamp lever 22 connected to the support member 64 is housed in the substrates 56a and 56b, and is in the unclamped state.

As described above, in the unclamped state shown in FIG. 1, the predetermined range of the clamp lever 22 is the substrate 56a, 5c.
Since it is housed in 6b and does not project to the outside, for example, the welded work W after the machining process can be easily removed, and a new work W can be easily set on the jig G. You can

[0036]

According to the clamp cylinder device of the present invention, the following effects can be obtained.

That is, in the unclamped state, the arm member is housed in the casing and does not project, so that the arm member does not interfere and the work for performing the next step is easily positioned. Can be fixed.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a clamp cylinder device according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a state in which the clamp lever is displaced by a predetermined amount from the state shown in FIG.

FIG. 3 is a partial cross-sectional view showing a state in which the clamp lever is displaced by a predetermined amount from the state shown in FIG.

FIG. 4 is a partial cross-sectional view showing a state in which the clamp lever is displaced from the state shown in FIG. 3 by a predetermined amount.

5 is a partial cross-sectional view showing a state in which the clamp lever shown in FIG. 4 is in contact with a work and holds the work.

6 is a vertical cross-sectional view taken along the line VI-VI of FIG.

7 is a vertical cross-sectional view taken along the line VII-VII of FIG.

8 is a partial perspective view of a piston packing which constitutes the clamp cylinder device of FIG. 1. FIG.

[Explanation of symbols]

10 ... Clamp cylinder device 12a, 12b
... Cylinder chamber 14 ... Cylinder body 16 ... Piston 18 ... Cylinder mechanism 20 ... Piston rod 22 ... Clamp lever 24 ... Clamp mechanism 28 ... Rod cover 30a, 30b
... Pressure fluid inlet / outlet port 34 ... Collar 40 ... Spring member 48 ... Piston packing 51 ... Gasket 52, 54 ... Guide holes 56a, 56b
... Substrate 58a-58c ... Guide roller 60a-60c
... Support shafts 62a, 62b ... Support plate 64 ... Support member W ... Workpiece G ... Jig

Claims (4)

[Claims] 1. A cylinder mechanism and a clamp mechanism, wherein the cylinder mechanism reciprocates between a cylinder body defining a set of pressure fluid inlet / outlet ports and a cylinder chamber defined in the cylinder body. A piston rod that is engaged with the piston and that is integrally and linearly displaced together with the piston; the clamp mechanism includes a casing connected to the cylinder body and is rotatable by a predetermined angle. An arm member that is pivotally supported and holds the work by contacting the work, a pivotal support unit that is integrally displaced together with the piston rod and pivotally supports the arm member, and guides the pivotal support unit. The arm member is rotatably displaced by a predetermined angle with the shaft support means as a fulcrum under the guiding action of the guide means. Clamping cylinder apparatus characterized by retractable be displaced within. 2. The apparatus according to claim 1, wherein the guide means includes a first guide hole and a second guide hole defined in the casing, and is rotatably attached to the shaft supporting means so as to be rotatable. A clamp cylinder device comprising a plurality of rollers which are respectively displaced along the hole and the second guide hole. 3. The apparatus according to claim 1 or 2, wherein the shaft supporting means comprises a first supporting shaft which is displaced along the first guide hole under the rotating action of the first roller mounted on the shaft, and a shaft, respectively. The second support shaft and the third support shaft are displaced along the second guide hole under the rotating action of the attached second roller and the third roller, and the second support shaft is connected to the piston rod. The second support shaft and the third support shaft are integrally supported via a support plate, the arm member is supported by the first support shaft and the third support shaft, and the first support shaft is a fulcrum at a predetermined angle. A clamp cylinder device that rotates. 4. The apparatus according to claim 2 or 3, wherein the first guide hole extends linearly and is formed to have a predetermined length.
The clamp cylinder device is characterized in that the guide hole includes a straight line portion substantially parallel to the first guide hole and having a length larger than that of the first guide hole, and a curved portion curved toward the work side.