JP3087630B2 - 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 and, more particularly, to a technique for selectively clamping a plurality of types of workpieces with one clamp device.

[0002]

2. Description of the Related Art In an automobile such as a van-type vehicle, the rear compartment of a passenger wagon and a cargo loading van are usually formed of substantially the same body. In this body configuration, the rear door such as a sliding door has a cut-out window in which a glass is fitted in the case of a door used for a wagon, while the window used in a door used in a van is notched. The part is in the form of an iron plate pressed integrally with the door body. In this case, a door with a notched window,
It is clear that the rigidity is different from that of the iron-plated door pressed in one piece. Therefore, when these doors are closed, the amount of bending (the amount of bending) to the outside of the vehicle differs due to the repulsive force received from the weather strip. Therefore,
In a process of assembling a door such as a sheet metal process, it is necessary to perform an operation such as spot welding while considering the amount of bending.
Therefore, it is necessary to separately prepare a receiving piece for sandwiching and positioning and fixing the door according to the amount of bending.

For this reason, in a production line or the like that handles two types of doors, in a door assembling process, conventionally, as shown schematically in FIG. 8 , two units each having a receiving piece corresponding to each type of door are used. Were placed adjacent to each other. Here, FIG. 8 (A) is a left side view showing one of the clamp device 100, and FIG. 8 (B) is a front view of a secondary sets of clamping devices 100 and 200, FIG. 8
(C) is a right side view showing the other clamp device 200. In the clamping device 100 shown in FIG. 8 (A), the cylinder 102 and the supporting plate 118 is provided on the fixing plate 120 is fixed to the jig body (not shown). Rotating plate 1 rotatably supported on a support shaft of this supporting plate 118
In reference numeral 06, one of the three end pieces is connected to the distal end of the piston rod 104 of the cylinder 102. Also,
A cylinder 108 is provided on a second end piece of the rotating plate 106, and a tip of a piston rod 110 of the cylinder 108 is connected to one end of a clamp arm 112. The clamp arm 112 is rotatably supported by a third end piece of the rotating plate 106. Then, a clamp claw 114 provided on the other end side of the clamp arm 112
Holds a door (second work) between itself and a receiving piece 116 provided on the rotating plate 106.

[0004] Next, the clamp device 20 shown in FIG. 8 (C)
At 0, a cylinder 202 and a receiving piece 210 are provided on a fixing plate 212 fixed to a jig body (not shown). The tip of a piston rod 204 of the cylinder 202 is connected to one end of a clamp arm 206. The clamp arm 206 is rotatably supported by an end piece of the fixed plate 212. A clamp claw 208 is provided on the other end of the clamp arm 206. The clamp claw 208 clamps another door (first work) with the receiving piece 210.

[0005] These two clamping devices 100, 20
0 is located adjacent as shown in FIG. 8 (B). The clamp jaws 114 when the clamping device 100 is in use as shown in FIG. 8 (A) and受駒11
6, the door (second work) is sandwiched, and the cylinder 1
Shrink 02 of the piston rod 104, the other door between the clamp jaws 208 and受駒210 of the clamping device 200 when in the state in which the arm-raising upward around the shaft of the support plate 118 to pivot plate 106 (First work). When two types of workpieces need to be clamped in this manner, two clamp devices 100 and 200 are conventionally arranged adjacent to each other so that one type of workpiece is clamped by the clamp device 100 and another type of workpiece is clamped. The switching corresponding to the two types of works has been performed by clamping the clamp device 200.

[0006]

However, when the target work becomes a large object such as a door, the receiving piece becomes correspondingly large, and the position for holding the two kinds of works is set as close as possible . Therefore, it is necessary to dispose the clamp device within a range where the actuator or the like does not interfere. Therefore, a large jig space is required for arranging the two clamp devices adjacent to each other. Further, the number of actuators required to clamp two types of workpieces in each of the clamping devices has increased, and the equipment cost has been increased. The present invention has been made in view of such a point, and its problem is substantially solved in the work surface direction.
It is an object of the present invention to provide a clamp device which clamps a work at the same position and reduces the occupied jig space.

[0007]

According to a first aspect of the present invention, there is provided a clamp device comprising a receiving piece for receiving a work, and a clamp claw for holding the work between the receiving piece. A first receiving piece fixed at a predetermined position and receiving the first work, and a second receiving piece provided movably between the use position and the retreat position and receiving the second work at the use position . , Comprising a first clamp claw and a second clamp claw,
The second has a common clamp are movable in受駒, the first clamp jaws and the first受駒when the second受駒is in the retracted position And the second workpiece is held between the second receiving piece and the second clamp claw when the second receiving piece is at the use position. It is a clamp device configured to be clamped.

According to the first aspect of the present invention, the common class
Because of the provision of the pump, two types of workpieces can be selectively held at the same position by one clamp device. Therefore, the number of clamp devices required for the jig can be reduced, and as a result, the equipment cost can be reduced.

According to a second aspect of the present invention, in the clamp apparatus according to the first aspect, the second receiving piece is provided rotatably with respect to the first receiving piece, and the common clamp is provided with the common clamp. It is provided rotatably with respect to the second receiving frame.

According to the second aspect of the present invention, the second receiving frame is provided rotatably with respect to the first receiving frame, and the second receiving frame is provided with the second receiving frame.
Since the common clamp is provided rotatably with respect to the second receiving piece, the cooperation of the second receiving piece and the common clamp allows
It is possible to select one of the two clamp claws provided on the common clamp and to clamp the work with the receiving piece. For this reason, it is possible to reliably hold the workpiece in accordance with two types of works having different rigidities and shapes.

According to a third aspect of the present invention, in the clamp device according to the first aspect, the second receiving piece projects from the first receiving piece at the use position, and the first receiving piece at the retracted position. Is formed so as to be retracted from the received frame.

According to the third aspect of the present invention, when the second receiving frame is in the use position, the second receiving frame and the second clamp are preferentially used regardless of the presence of the first receiving frame. The second work can be sandwiched between the claws. Therefore, it is possible to selectively sandwich a work having a complicated shape.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, will be explained on the basis of one specific embodiment for implementing the present invention in FIGS. 1 to 6. In here, FIG. 1 and FIG. 2 is a diagram showing a configuration of a clamping device,
1A is a left side view, FIG. 1B is a front view,
FIG. 2 shows a right side view. FIG. 3 shows a state before the second work is held, and FIG. 4 shows a state where the second work is held. Similarly, FIG. 5 shows a state before holding the first work, and FIG. 6 shows a state where the first work is held.

First, FIG. 1A, FIG. 1B and FIG.
In the present invention, the clamp device of the present invention mainly includes the cylinders 10 and 20, the turning plate 18, the clamp arm 34,
2, 44 and a fixed plate 56. Here, the cylinder 10 rotates the rotation plate 18, and the cylinder 20 rotates the clamp arm 34. A receiving piece (hereinafter, referred to as “fixed receiving piece”) 42 provided on the fixed plate 56 holds the first work between the clamp claw 38 provided on the clamp arm 34. Similarly, a receiving piece (hereinafter, referred to as a “movable receiving piece”) 44 provided on the rotating plate 18 has a second position between another clamp claw 40 similarly provided on the clamp arm 34. Of the work. In addition, although both pneumatic cylinders are usually used for the cylinders 10 and 20, a hydraulic cylinder may be used for at least one of them.

The fixed plate 56 fixed to the jig is provided with the fixed plate 54 fixed together with the fixed receiving piece 42. The cylinder 10 is rotatably provided on an end piece 58 of the fixed plate 54, and a support piece 52 for supporting the rotary plate 18 is provided below the fixed plate 54 so as to sandwich the rotary plate 18. I have. The rotation plate 18 is rotatably supported on the support shaft 50 on the support piece 52. The rod tip 14 of the cylinder 10 and the turning plate 18 are rotatably supported on a support shaft 16 of the turning plate 18. With this structure, when the piston rod 12 of the cylinder 10 is expanded and contracted,
8 rotates around the support shaft 50. On the other hand, the fixing plate 54 has △ -shaped stopper projections 48 and 60 on the support shaft 5.
The W-shaped stopper concave portions 46 and 62 are provided on the rotary plate 18 at positions corresponding to the stopper convex portions 48 and 60, respectively. Therefore, when the piston rod 12 of the cylinder 10 is extended, the turning plate 18 turns and the stopper projection 48
The movable receiving piece 44 comes into contact with the stopper concave portion 46 while being engaged therewith. When the piston rod 12 of the cylinder 10 is shortened, the stopper convex portion 60 is moved to the stopper position.
The movable receiving piece 44 is in a retracted state while being in contact with the concave portion 62 while being engaged therewith.

A cylinder 20 is rotatably provided on the end piece 22 of the rotating plate 18, and its rod tip 2
6 is rotatably supported on a support shaft 28 provided on one end side of the clamp arm 34. A fixed piece 30 is provided on the clamp arm 34, and the fixed piece 30 is rotatably supported on a support shaft 32 of the rotating plate 18. With this structure, when the piston rod 24 of the cylinder 20 is expanded and contracted, the clamp arm 34 rotates about the support shaft 32. On the other hand, as described above, the clamp claw 40 corresponding to the movable receiving piece 44 is provided on the other end side of the clamp arm 34, and is further fixed on the arm piece 36 fixed on the other end side of the clamp arm 34. A clamp claw 38 corresponding to the receiving piece 42 is provided. These clamp claws 38 and 40 are formed so as to correspond to the type and shape of the work to be clamped.
In the case of (A), the angle of the clamp claw 38 is smaller than that of the clamp claw 40 (based on the horizontal line). By this structure, the first receiving piece 42 and the
The second work can be selectively pinched between the movable receiving piece 44 and the clamp claw 40. The holding makes it possible to position and fix the work.

Next, an operation for selectively clamping two types of works will be described with reference to FIGS. As these two types of works, it is possible to selectively sandwich these doors by setting the first work as a door used for a wagon and the second work as a door used for a van, for example. Note that, for each element shown in FIGS. 3 to 6, the same elements as those shown in FIG.

First, the state shown in FIG. 3 is the second use state in which the second work 66 is held by the movable receiving piece 44, that is, the piston rod 12 of the cylinder 10 is extended so that the stopper convex portion 48 engages with the stopper concave portion 46. While in contact. In this use state, when the piston rod 24 of the cylinder 20 is extended in the direction of the arrow D2, the clamp arm 34 rotates around the support shaft 32 in the direction of the arrow D4 (clockwise). Due to the rotation, the second work 66 hooked on the work catching piece provided below the movable receiving piece 44 is sandwiched between the movable receiving piece 44 and the clamp claw 40, and this is clamped. As shown in FIG. Note that the piston rod 24 of the cylinder 20 is indicated by an arrow D.
When it is contracted in the direction opposite to the direction 2, the pinched state is released and the state returns to the state of FIG.

Next, when the piston rod 12 of the cylinder 10 is contracted in the direction of arrow D6 in the state shown in FIG. 3, the retracted state shown in FIG. 5 is obtained. In this retracted state, the piston rod 12 of the cylinder 10 is contracted, and the stopper projection 60 is
It is in a state of being in contact with the concave portion 62 while being engaged. At this time, the piston rod 24 of the cylinder 20 is set to the arrow D8.
When extended in the direction, the clamp arm 34 rotates around the support shaft 32 in the direction of arrow D10 (clockwise). Due to the rotation, the first work 64 hooked on the work hooking piece provided below the fixed receiving piece 42 is sandwiched between the fixed receiving piece 42 and the clamp claw 38, and this is clamped. As shown in FIG. When the piston rod 24 of the cylinder 20 is contracted in the direction opposite to the arrow D8, the holding state is released and the state returns to the state shown in FIG.

Therefore, the clamp device of the present invention provides a fixed receiving member 42 [first receiving member] fixed at a predetermined position.
A movable receiving member 44 [second receiving member] movably provided between a use position and a retreat position;
A clamp arm 34 (common clamp) including a [first clamp pawl] and a clamp pawl 40 [second clamp pawl] is provided. When the movable receiver 44 is in the retracted position, the first work is held between the fixed receiver 42 and the clamp claw 38, and when the movable receiver 44 is in the use position, the movable receiver 44 and the clamp are clamped. The second work is sandwiched between the claws 40. Here, since the clamp arm 34 is provided with two types of clamp claws 38 and 40, the actuator for moving the clamp arm 34 is also the cylinder 2
Only 0 is needed. Therefore, one actuator (cylinder) is not required as compared with the conventional two clamp devices.
Further, jig space portion corresponding to the conventional clamping device 200 is no longer required, the same position with respect to the workpiece surface direction
In this way, two types of workpieces having different clamping positions with respect to the clamping direction can be clamped, the work assembling accuracy can be improved, and the jig space for disposing the clamp device can be reduced. As a result, the number of clamping devices required for the jig can be reduced, and as a result, equipment costs can be reduced.
On the other hand, two types of clamp claws 38, 40 and fixed receiving pieces 42,
By properly using the movable receiving piece 44, two types of works can be selectively clamped by one clamp device. By the sandwiching, the work can be accurately positioned and fixed.

In practice, when a single work such as a door is to be clamped, it may be difficult to clamp with a single clamping device of the present invention depending on the size of the work.
Therefore, as shown in FIG. 7, a plurality of (three in the case of FIG. 7) clamping devices of the present invention are arranged adjacent to each other, and they are almost simultaneously operated to be in a clamping state. Then, one step of the production line such as spot welding is performed under the sandwiched state. Therefore, according to the clamp device of the present invention in which the jig space is reduced, a plurality of clamps can be arranged adjacently even in the case of a small jig.

Further, in the clamp device of the present invention, a movable receiver 44 [second receiver] is provided rotatably with respect to the fixed receiver 42 [first receiver]. On the other hand, a clamp arm 34 (common clamp) is rotatably provided. Therefore, by the cooperation of the movable receiving piece 44 and the clamp arm 34, one of the two clamp claws 38, 40 provided on the clamp arm 34 is selected to clamp the work between the receiving pieces 42, 44. can do. For this reason, it is possible to securely clamp the two types of works having different rigidities and shapes.

The structure, shape, size, material, number, arrangement, operating conditions, and the like of the other parts in the clamp device described above are not limited to the above-described embodiment. For example, the following embodiments that apply the above-described embodiment can be implemented. ( 1 ) The shapes of the receiving piece and the clamp claws are changed according to the type (including characteristics such as material and rigidity) of the work and its shape. This makes it possible to selectively sandwich two types of members not only in the door of the vehicle but also in other members related to the vehicle and other arbitrary members other than the vehicle. It is more preferable that the receiving piece and the clamp claw are configured to be replaceable (detachable) according to the type of the work. In this way, the time required for replacement can be reduced, and the production line can be quickly operated. ( 2 ) Although a cylinder (pneumatic or hydraulic) is used as the actuator, a motor may be used together with a mechanism that converts the rotational motion of the rotating shaft into a reciprocating motion of the piston. In this configuration, the rotation of the motor causes the clamp arm to rotate, so that the effects of the above-described embodiment of the present invention are clearly obtained.

[0024] (3) may reciprocate providing constituting the clamp arm 34 which is connected at a predetermined position of the rotating plate 18 in the shaft 28 to the rod end portion 26 of the cylinder 20. In this configuration, the expanding and contracting the piston rod 24 of the cylinder 20, the clamp arm 34 rotating plate 18
Reciprocating at a predetermined position of the movable receiver 44 or the fixed receiver 4
2 can be held between the workpieces. ( 4 ) Clamp pawl 3 on rod tip 26 of cylinder 20
8, 40 may be provided. In this configuration, the cylinder 20
By expanding and contracting the piston rod 24, the work can be directly sandwiched between the movable receiver 44 and the fixed receiver 42. Even with these configurations (3) and (4), two types of workpieces can be selectively and reliably sandwiched, and the effects of the above-described embodiment of the present invention can be obtained.

( 5 ) The rotating plate 18 and the clamp arm 34 may be slidably provided. Specifically, the rotation plate 18 is slid by the cylinder 10 and the clamp arm 34 is slid by the cylinder 20. In this configuration, the rotating plate 1
8 and the clamp arm 34 are moved in the horizontal direction in FIG. 3 and the like, so that the work is held between the movable receiver 44 and the fixed receiver 42 as in the above-described embodiment. Becomes possible.

[0026]

According to the first aspect of the present invention, two types of workpieces can be selectively clamped by one clamp device. Therefore, it is possible to reduce the number of clamping devices required for a production line or the like, and as a result, it is possible to reduce equipment costs. Further, the work can be positioned and fixed by the sandwiching.

According to the second aspect of the present invention, one of the two clamp claws provided on the common clamp is selected by the cooperation of the second clamp and the common clamp, and the second clamp is connected to the common clamp. Work can be held between them. for that reason,
It can be securely clamped to two types of works having different rigidities and shapes.

Further, according to the third aspect of the present invention, when the second receiving frame is in the use position, the second receiving frame and the second clamp are preferentially provided regardless of the presence of the first receiving frame. The second work can be sandwiched between the claws. Therefore, a workpiece having a complicated shape can be selectively sandwiched.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a clamp device.

FIG. 2 is a right side view illustrating a configuration of a clamp device.

FIG. 3 is a diagram illustrating a use state before clamping.

FIG. 4 is a diagram illustrating clamping of a work in a use state.

FIG. 5 is a diagram showing a retracted state before being pinched.

FIG. 6 is a diagram illustrating the holding of a work in a retracted state.

FIG. 7 is a diagram illustrating an actual work holding state;

FIG. 8 is a view showing a conventional clamping device.

[Explanation of symbols]

10, 20 Cylinder [actuator] 12, 24 Piston rod 18 Rotating plate 34 Clamp arm [Common clamp] 38, 40 Clamp claw 42, 44 Receiver 46 Stopper recess 48 Stopper protrusion 54, 56 Fixing plate 60 Stopper protrusion 62 Stopper recess

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B23Q 3/06

Claims (3)

(57) [Claims] 1. A clamping device comprising a receiving piece for receiving a work, and a clamp claw for holding the work between the receiving piece, wherein the clamping device is fixed at a predetermined position and receives a first work. and one of受駒, is movable between a retracted position and a use position, wherein
Comprising a second受駒receiving the second work in the position of use, a first clamping claws and second clamp jaws, said first
And a common clamp movably provided on the second receiving piece. When the second receiving piece is at the retracted position, the first receiving piece and the first clamp claw are connected to each other. The second work is held between the second receiving piece and the second clamp claw when the second receiving piece is at the use position. A clamping device, characterized in that: 2. The clamp device according to claim 1, wherein the second receiving piece is provided rotatably with respect to the first receiving piece, and the common clamp is provided with respect to the second receiving piece. A clamp device, which is provided rotatably. 3. The clamp device according to claim 1, wherein the second receiving piece projects from the first receiving piece at the use position and retreats from the first receiving piece at the retreat position. A clamping device characterized by being formed in.