JPH0857789A - Clamper - Google Patents

Abstract

PURPOSE: To position a workpiece with high accuracy by clamping the workpiece from both sides by a pair of clamping action points provided at one slider and a clamping action point provided at the other slider. CONSTITUTION: A first slider 2 is returned into the direction of an arrow mark A by the energizing force of a coil spring 11 and a coil spring 22. At the same time, one slider 4A between second sliders 4A, 4B is returned in the direction of an arrow mark D being moved against the energizing force of the coil spring 22 until rollers 6A, 6B provided at one slider 4A and a roller 6C provided at the other slider 4B come in contact with both side faces of a workpiece, and the other slider 4B is returned in the direction of an arrow mark C against the energizing force of the coil spring 22. The workpiece is thereby clamped from both sides by three rollers 6A, 6B, 6C. In this clamping, all three rollers 6A, 6B, 6C (clamping action points) come in contact with the workpiece to hold it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamper for holding and positioning a work by sandwiching it from both sides.

[0002]

2. Description of the Related Art There have been many clampers for holding and positioning a work by sandwiching it from both sides. 4 and 5 each show an example of a conventional clamper. In addition, in FIG. 4 and FIG. 5, the components denoted by the same reference numerals indicate the corresponding components.

Therefore, the clamper shown in FIG. 4 will be described. The clamper here has a pair of left and right arms 52 and 53 which are rotated around a support shaft 51 as a fulcrum. A pair of rollers (54a, 54b), (55a, 55b) serving as positioning clamp action points
Is attached. The rollers 54a and 55a and the rollers 54b and 55b are arranged symmetrically to each other. Further, in the figure, reference numeral 56 is a fixed end for positioning the work. Further, the work 57 is the roller 5
The surfaces sandwiched by the rollers 4a and 55a and the rollers 54b and 55b are symmetrical, and the surfaces 57
An example is one in which b and 57c are formed as large curved surfaces.

When the work 57 is clamped, the end face 57a of the work 57 is first fixed to the fixed end 56 in a state where the pair of arms 52 and 53 are each rotated outward to the position shown by the alternate long and short dash line. Contact and position. Next, the arms 52 and 53 are rotated inward until the rollers 54a and 55a and the rollers 54b and 55b come into contact with the surfaces 57b and 57c of the work 57, and the work 57 is sandwiched between the rollers 54a and 55a and the rollers 54b and 55b. It can be sandwiched with.

Next, the clamper shown in FIG.
The first and second clamper portions 60a and 60b are arranged symmetrically at the front and rear positions with the 7 in between. Each of the clamper parts 60a, 60b has a pair of left and right arms 62, 63 which are rotated around a support shaft 61 as a fulcrum, and rollers 64, 65 as a positioning clamp action point are attached to the respective arms 62, 63. There is. It should be noted that the rollers 64 and 65 here are arranged at mutually symmetrical positions.

When the work 57 is clamped, the end face 57a of the work 57 is first fixed to the fixed end 56 in a state where the pair of arms 62 and 63 are rotated outwardly to the positions shown by the alternate long and short dash lines in the figure. Contact and position. Next, the rollers 54a and 55a move the surfaces 57b, 5 of the work 57.
The arms 52 and 53 are rotated inward until they come into contact with 7c, respectively, and the work 57 can be sandwiched by the rollers 54a and 55a.

[0007]

However, in the conventional clamper shown in FIG. 4, one roller has two rollers (54a, 54b) and (55a, 55).
b) is provided as a positioning clamp action point, and the work 57 is clamped by the four rollers (54a, 54b) and (55a, 55b), so that one of these four positioning clamp action points is used. There is a risk that the points of action will not come into contact with each other and an air gap will occur, resulting in tilting. Therefore, there is a problem that high-precision positioning cannot be performed.

On the other hand, in the conventional clamper shown in FIG. 5, each arm 64 has one roller 64,
Since 65 is attached, it is possible to perform the positioning with high accuracy without causing a void due to one contact point of the four positioning clamp contact points not being brought into contact with each other. However, the pair of clamper parts 60
Since a and 60b are used, there is a problem that the mechanism becomes complicated and the device becomes expensive.

The present invention has been made in view of the above problems, and an object thereof is to provide a clamper which is inexpensive and has a structure capable of positioning and holding with high accuracy. Furthermore, other purposes will be clarified one after another in the content described below.

[0010]

In the present invention, the object is to provide a first slider that is linearly reciprocated, a guide rail, and a pair of second sliders that are reciprocally moved by being guided by the guide rail. And a pair of second sliders and the first slider are linked to each other, and the movement of the first slider is performed in different directions of the pair of second sliders. A pair of left and right link pieces for converting to a movement to reciprocate,
A pair of positioning clamp action points attached to one slider of the pair of second sliders and a pair of positioning clamp action points attached to the one slider, and the pair of clamp action points. A positioning clamp operating point attached to the other slider of the second sliders located substantially in the middle of the second slider, and a pair of clamping operating points provided on the one slider and the other slider. This is achieved by adopting a configuration in which the work is clamped from both sides at one clamping action point provided on the above and three clamping action points.

[0011]

According to this structure, the work is provided with two clamping points arranged on one side of the workpiece and one clamp arranged on the other side corresponding to approximately the middle of the two clamping points. Since it is clamped by the three points of action with the point of action, there is no need to say that one of the three points of action of the clamp will tilt without being attached to the workpiece, and with a simple structure and high precision. Positioning can be performed.

[0012]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is an overall structural layout view of a clamper shown as an embodiment of the present invention. In FIG. 1, this clamper is roughly composed of a substrate 1 and a first slider 2.
, A pair of second sliders 4A, 4B, a pair of left and right link pieces 5A, 5B, and three rollers 6A, 6B, 6C as clamping points.

More specifically, the substrate 1 is fixedly attached to a device body (not shown) with bolts 7. A spring retaining member 8 is fixedly mounted on the substrate 1, and a stopper 9 is attached.
Are attached so that they are projected downward. The stopper 9 is formed of a bolt, and the downward protrusion amount can be adjusted by changing the screwing amount.

The first slider 2 has a guide rail 31.
It is slidably attached to the apparatus main body via a cross roller way 31 having a. That crossway 31
Is, for example, manufactured by Nippon Thomson (model number CRWM2-45)
Cross roller way is used, the first slider 2
Is moved only in the up-down direction (arrow AB direction in FIG. 1) in a state where movement in the front-rear direction and the left-right direction is restricted. In addition,
The holding of the first slider 2 is not limited to the above-mentioned cross roller way 31, but other than this as long as the movement of the first slider 2 can be restricted so as not to move in the front, rear, left and right directions. Even if the structure is, it does not matter. Further, a bracket 10 is attached to the first slider 2, and a coil spring 11 is provided between the bracket 10 and the spring retaining member 8.
The first slider 2 is constantly urged upward (in the direction of arrow A in FIG. 1), and the stopper 9
Is held in a state of being in contact with the lower end of the and regulated position. Although not shown, a cylinder / piston is arranged between the first slider 2 and the main body of the apparatus, and the cylinder / piston resists the biasing force of the coil spring 11 by the cylinder / piston. Has a structure that can be moved downward.

Similar to the cross roller way 31, the pair of second sliders 4A and 4B are slidably attached to the main body of the apparatus through a cross roller way 41 made by Japan Thomson Co. having a guide rail 3. ing. The guide rail 3 of the cross roller way 41 is fixedly attached to the apparatus main body in a state of intersecting the moving direction of the first slider 2 at a substantially right angle. It The second sliders 4A and 4B slidably attached to the main body of the apparatus via the cross roller way 41 are left and right (in FIG. It is reciprocated only in the direction of arrow C-D). A coil spring 22 is interposed between the pair of second sliders 4A and 4B, and the pair of second sliders 4A and 4B are always pulled inward by the biasing force of the coil spring 22. It is in the state where it was opened.

The pair of left and right link pieces 5A and 5B are arranged symmetrically. Of these, one link piece 5
A has one end rotatably attached to the first slider 2 via a pivot 13, and the other end has a pivot 14
It is rotatably attached to the second slider 4A via. On the other hand, one end of the other link piece 5B is rotatably attached to the first slider 2 via the pivot 13, and the other end is rotatable to the second slider 4B via the pivot 14. Is attached to.
When the first slider 2 is moved in the vertical direction, the pair of left and right link pieces 5A and 5B converts this movement into movement in which the second sliders 4A and 4B are moved to the left and right, and the second slider 4A, 4B, and the second
The sliders 4A and 4B are moved in different directions. That is, when the first slider 2 is moved upward (in the direction of arrow A in FIG. 1), the second slider 4A is moved in the right direction (in the direction of arrow D in FIG. 1) in conjunction with this, and The second slider 4B is moved leftward (in the direction of arrow E in FIG. 1). On the other hand, when the first slider 2 is moved downward (direction of arrow B in FIG. 1), the second slider 4A is moved rightward (direction of arrow D in FIG. 1) in conjunction with this. And the second slider 4B
To the left (the direction of arrow C in FIG. 1).

Rollers 6A and 6 serving as clamping points
Among the rollers 6C and 6C, the roller 6A and the roller 6B are rotatably attached to the arm 15 protruding downward from the second slider 4A, which is one of the rollers 6A and 6B, respectively, via pivots 16.
Is rotatably attached to the arm 17 protruding downward from the other second slider 4B via a pivot 18. Further, the rollers 6A, 6B and the roller 6C are opposed to each other, and the roller 6C includes the rollers 6A and 6B.
It is arranged at a position L1 = L2 (see FIG. 4) which is substantially in the middle.

In addition, a fixing member 19 for positioning a work is fixedly attached to the main body of the apparatus, substantially corresponding to the bottom surface of the second slider 4B. This fixing member 19
Has two positioning surfaces 19a and 19b on the lower surface side, and the center 21 of these positioning surfaces 19a and 19b is the roller 6
When the work 57 is sandwiched by A, 6B and 6C, the distance L3 from the roller 6C to the center 21 is substantially equal to the distance L4 from the center 21 to the rollers 6A and 6B, that is, (L3 = L4). Is set to.

Next, the operation of this clamper will be described for the case where the same workpiece 57 as the workpiece shown in FIGS. 4 and 5 is clamped. First, in the case of clamping, a cylinder / piston (not shown) is driven to move the first slider 2 against the biasing force of the coil spring 11 in the direction of arrow B in FIG. Hold this state. Then, the movement of the first slider 2 is changed by the second sliders 4A and 4B via the link pieces 5A and 5B.
1 and the second slider 4A is moved in the direction of arrow C in FIG. 1 against the urging force of the coil spring 22, and the second slider 4B is moved in the direction of arrow D in FIG. Moved against the urging force of.
As a result, the rollers 6A, 6B and 6C are moved to the position shown by the alternate long and short dash line in FIG. 1, and the distance L5 between the pivots 16 and 18 which is the center of the centers of the rollers 6A and 6B is widened.

Next, the work 57 is provisionally placed with its end surface 57a positioned and brought into contact with the positioning surfaces 19a and 19b of the fixing member 19. After this, the cylinder / piston releases the holding force that was moving the first slider 2 in the direction of arrow B in FIG. Then, the first slider 2 is returned in the direction of arrow A in FIG. 1 by the biasing force of the coil spring 11 and the coil spring 22. At the same time, the second slider 4A is attached with the coil spring 22 in the direction of arrow D in FIG. 1 until the rollers 6A, 6B and the roller 6C come into contact with the surfaces 57b, 57c of the work 57 and are regulated. Moved against the forces and returned,
The second slider 4B is returned in the direction of arrow C in FIG. 1 against the urging force of the coil spring 22, and thereby holds the work 57 with the three rollers 6A, 6B, 6C.
Therefore, in this clamping, all three points are attached to and held by the work 57. Moreover, in this embodiment, in order to make the clamp force constant, only the force for opening the clamp is supplied from the outside (cylinder / piston), and the force for closing the clamp is supplied by the coil springs 11 and 22.
It can be stably held with equal force. Also,
Center 21 with positioning surfaces 19a and 19b of fixing member 19
However, when the work 57 is sandwiched between the rollers 6A, 6B, and 6C, the distance L3 from the roller 6C to the center 21 is the center 21
Is approximately equal to the distance L4 from roller 6A to roller 6B,
That is, since it is set to be (L3 = L4),
As long as the contact between the workpiece 57 and the fixing member 19 is maintained, it is possible to achieve a two-dimensionally consistent positioning accuracy without being clamped by a large clamping force.

Here, considering the case where the fixing member 19 is not provided, when the fixing member 19 is not used as shown in FIG. 3, when the surfaces 57b and 57c of the work 57 are formed by a large curved surface, When the 57 is clamped, the axis of symmetry Y rotates by a small angle θ (2 to 3 °).
This minute angle θ is only required to be corrected in position by several μ at the three positioning clamp action points (rollers 6A, 6B, 6C). Further, the rotation of the minute angle .theta. Does not usually cause a problem, but in the case of image processing or the like, the rotation angle of 2-3.degree. Has a great influence. However, in the case of this embodiment, the fixing member 19
Therefore, the positioning accuracy that is two-dimensionally consistent can be realized as long as the workpiece 57 is kept in contact with the fixing member 19.

Although the above embodiment discloses the structure in which one set of clampers is arranged on the guide lever 3, it is of course possible to provide a plurality of sets of clampers side by side on the same guide lever 3.

[0023]

As described above, according to the clamper of the present invention, the work is placed on one side of the work and on the other side of the work in correspondence with approximately the middle of the two points. Since it is sandwiched by 3 points, 1 point and 3 points, there is no possibility that one of the 3 points will tilt without being attached to the work, and positioning can be performed with high precision with a simple structure that can be realized at low cost. It can be performed.

[Brief description of drawings]

FIG. 1 is an overall configuration layout diagram of a clamper shown as an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a clamping operation state of the clamper of the present embodiment.

FIG. 3 is a schematic diagram illustrating a problem when a fixing member is not provided.

FIG. 4 is a schematic view showing an example of a conventional clamper.

FIG. 5 is a schematic view showing another example of a conventional clamper.

[Explanation of symbols]

 2 1st slider 4A, 4B 2nd slider 5A, 5B Link piece 6A, 6B, 6C Roller (clamping action point) 19 Fixing member (rotation prevention means) 31 Cross roller way 41 Cross roller way 57 Work

Claims (3)

[Claims] 1. A first slider that is linearly reciprocally moved, a guide rail, a pair of second sliders that are reciprocally moved by being guided by the guide rail, a pair of second sliders, and the first slider. And a pair of left and right link pieces for linking movement of the first slider into movements for reciprocating the pair of second sliders in mutually different directions, respectively. A pair of positioning clamp action points attached to one of the pair of second sliders and a pair of positioning clamp action points attached to the one slider, and the pair of clamp actions One positioning clamp acting point attached to the other of the second sliders located approximately midway between the points; A clamper for sandwiching a work from both sides at a pair of three clamping points, one pair of clamping points provided on the one slider and one clamping point provided on the other slider. . 2. The rotation preventing means for contacting the work and suppressing the rotation of the work is provided at a position substantially orthogonal to a direction in which the work is clamped by the three clamp action points. Clamper. 3. The clamper according to claim 1, wherein a plurality of the clampers are arranged side by side on the same guide rail.