JP2006205331A - Clamp mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clamp mechanism capable of clamping a sandwiching object in a stable state, regardless of a shape of the plate-like sandwiching object such as a work. <P>SOLUTION: This clamp mechanism is composed of a receiving part 2 arranged in a frame body 1, and a clamp part 5 arranged on the tip of a clamp arm 4 rotatably arranged in the frame body 1; and has a spherical surface-shaped receiving piece 3 in the receiving part 2. The clamp part 5 is provided with a pair of clamp pieces 6 and 6 at a predetermined interval with the receiving piece 3 as the center. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a clamping mechanism used in a clamping portion of a plate material such as a workpiece in a positioning jig for positioning and holding a plate-like object to be clamped such as a workpiece.

As a conventional plate material clamping mechanism, for example, as shown in FIG. 5, a receiving portion 102 provided in the frame main body 101 and a clamp arm 102 provided rotatably on the frame main body 101 are provided. 2. Description of the Related Art A clamp mechanism including a clamp portion 103 is known in which a receiving portion 102 and a clamp portion 103 are each provided with a spherical receiving piece 102a and a clamping piece 103a (for example, Patent Document 1). reference).
According to the clamp mechanism of this conventional example, since the plate material is sandwiched between the spherical receiving piece 102a and the clamp piece 103a, it can be clamped regardless of the shape of the plate-shaped object to be clamped. There is a merit of becoming.

Japanese Patent Laid-Open No. 7-80738

  However, in the above-described conventional technique, as described above, since the two-point support structure sandwiches the end of the plate-like object to be sandwiched between the two spherical surfaces, the plate-like shape of the clamped workpiece or the like There was a problem that the object to be clamped became unstable.

  As a solution to the above problems, it is conceivable to form the holding surface of the receiving piece and the clamp piece in a flat surface instead of a spherical surface. There was a problem of lack of versatility because it could not be done.

  The present invention is made by paying attention to the conventional problems as described above, and can clamp a plate-shaped object to be clamped in a stable state regardless of the shape of the object to be pinched, such as a workpiece. The object is to provide a clamping mechanism.

  In order to achieve the above-described object, a clamping mechanism according to claim 1 of the present application includes a receiving portion provided in a frame body and a clamping portion provided at a tip of a clamp arm rotatably provided in the frame body. A clamp mechanism in which a receiving piece formed in the receiving portion and a clamp piece formed in the clamping portion are opposed to each other, and one of the receiving piece or the clamping piece has a circular arc cross section. The other of the receiving piece or the clamp piece is formed as a pair of pieces having a predetermined interval.

  Further, the clamp mechanism according to claim 2 is the clamp mechanism according to claim 1, wherein the receiving portion or the clamp portion which is formed as a pair of pieces having a predetermined interval among the receiving piece or the clamp piece. Is provided so as to be swingable with respect to the frame body or the clamp arm.

  Further, the clamp mechanism according to claim 3 is the clamp mechanism according to claim 2, wherein the receiving portion or the clamp portion which is formed as a pair of pieces having a predetermined interval among the receiving piece or the clamp piece. A stopper mechanism is provided between the frame body and the clamp arm, and a stopper mechanism for regulating a swing range of the receiving portion or the clamp portion.

  According to a fourth aspect of the present invention, there is provided the clamping mechanism according to the third aspect, wherein the stopper mechanism is provided with a biasing means for returning the receiving portion or the clamping portion to the center of the swing range. It was set as the characteristic feature.

  The clamp mechanism according to claim 5 is the clamp mechanism according to any one of claims 1 to 4, wherein the clamp mechanism is formed by a pair of pieces having a predetermined interval between the receiving piece and the clamp piece. The piece is formed in an arc shape in cross section, and the radius of the arc of the other piece is formed larger than the radius of the arc of the pair of pieces.

  In the clamp mechanism according to claim 1, as described above, the clamp mechanism includes the receiving portion provided in the frame main body and the clamp portion provided at the tip of the clamp arm rotatably provided in the frame main body. A clamp mechanism in which a receiving piece formed in the receiving portion and a clamping piece formed in the clamping portion face each other, wherein one of the receiving piece or the clamp piece is formed in an arc shape in cross section, and the other of the receiving piece or the clamp piece Is in a three-point support state by adopting a structure formed as a pair of pieces having a predetermined interval, thereby stabilizing the object to be clamped regardless of the shape of the plate-like object to be clamped such as a workpiece. The effect of being able to clamp with is obtained.

  In the clamp mechanism according to claim 2, as described above, the receiving portion or the clamp portion formed as a pair of pieces having a predetermined interval among the receiving piece or the clamp piece swings with respect to the frame body or the clamp arm. If the delivery angle or position of the object to be clamped with respect to the clamping device is shifted by being provided, the clamp part will swing when only one clamp piece comes into contact with the upper surface of the object to be clamped at the time of clamping. As a result, the other clamp piece comes into contact with each other to be in a three-point support state. That is, by swinging the clamp portion, it is possible to avoid the concentration of the clamping force at one point at the initial stage of clamping even in the case of the three-point support structure.

  In the clamp mechanism according to claim 3, as described above, between the receiving portion or the clamp portion formed as a pair of pieces having a predetermined interval between the receiving piece or the clamp pieces and the frame body or the clamp arm. Since the stopper mechanism for restricting the swing range of the receiving part or the clamp part is provided, the stopper part can prevent the clamp part from being largely inclined in one direction before clamping.

  In the clamp mechanism according to claim 4, as described above, the stopper mechanism is provided with an urging means for returning the receiving portion or the clamp portion to the center of the swing range thereof, so that the swing angle of the clamp portion can be reduced. Since the object to be clamped can be clamped while being always centered, it is possible to prevent the clamping force from concentrating on one point at the initial stage of clamping.

  In the clamp mechanism according to claim 5, as described above, one of the receiving piece or the clamp piece, which is formed by a pair of pieces having a predetermined interval, is formed in a circular arc shape, and the arc of the pair of pieces is formed. By forming the radius of the arc of the other piece larger than the radius, centering is easy, and stability at the time of clamping the plate-shaped object to be clamped can be improved.

  Embodiments of the present invention will be described below with reference to the drawings.

The clamping mechanism of this embodiment corresponds to the inventions described in claims 1 to 5.
FIG. 1 is a side view of a clamp state showing the clamp mechanism of this embodiment, FIG. 2 is a side view of the clamp mechanism of the embodiment, and FIG. 3 is an enlarged view of the main part of the clamp state showing the clamp mechanism of the embodiment. 4 is a cross-sectional view taken along line AA in FIG.

  The clamp mechanism of this embodiment includes a frame main body 1, a receiving portion 2, a receiving piece 3, a clamp arm 4, a clamp portion 5, a pair of clamp pieces 6, 6, a clamp arm rotating mechanism 7, And a work placement unit 8.

  The frame main body 1 is a frame in which the clamping mechanism of the embodiment is incorporated, and is provided in a state in which it can be moved in the horizontal direction via vertical and horizontal rails with respect to a base (not shown). ) 9 can be transported to an arbitrary position. In this embodiment, a case where the workpiece 9 is clamped around the corner portion 91 of the chevron cross section will be described as an example.

  The receiving portion 2 serves to support the lower surface side of the work 9 and is provided in a state of projecting obliquely forward and upward at the front end portion of the frame body 1, and a hemispherical receiving piece 3 is provided at the front end portion. It has been.

  The clamp arm 4 is formed in a substantially T shape having a horizontal portion 42 at the upper end of the support shaft 41 in a side view, and the lower end portion of the support shaft 41 is the upper surface of the frame body 1 in the vicinity of the receiving portion 2. It is rotatably supported with respect to a bearing portion 11 provided in the portion.

  The clamp portion 5 serves to support the upper surface side of the work 9, and a central portion in the front-rear direction is pivotally supported with respect to a bearing portion 42 a provided on the lower surface side of the distal end portion of the horizontal portion 42 in the clamp arm 4. Thus, the receiving piece 3 is provided so as to be swingable about the axial center line Q1.

  Stopper receiving portions (stopper mechanisms) 51 and 51 projecting in the front-rear direction are formed on the upper surface side of the clamp portion 5, and stopper pins are provided on the lower surface side of the clamp arm 4 facing both the stopper receiving portions 51 and 51. (Stopper mechanism) 43 and 43 are provided, and the swinging range of the clamp part 5 is regulated within a certain range.

  The stopper pins 43, 43 are screwed in a state of penetrating the clamp arm 4 in the up-down direction, and the protruding height of the lower end protruding portion can be adjusted. In the figure, 44 and 44 are stopper pin positioning nuts.

  The clamp pieces 6, 6 are formed in a hemispherical shape having a smaller diameter than the spherical radius of the receiving piece 3, and the axial center line Q 2 is received on the lower surface side of both ends in the front-rear direction of the clamping portion 5. It is provided in a state oriented in the direction.

  The clamp arm rotation mechanism 7 serves to rotate the clamp arm 4, and an air cylinder 71 is used in this embodiment. That is, the main body portion 71 a of the air cylinder 71 is pivotally supported with respect to the bearing portion 12 provided on the frame main body 1, and the front end of the piston shaft 71 b is at the rear end portion of the horizontal portion 42 of the clamp arm 4. It is connected so that it can rotate freely.

  The work placing portion 8 serves to place the other end of the work 9 and is provided so as to be able to move forward and backward in the front-rear direction. ing.

Next, functions and effects of the embodiment will be described.
Since the clamp mechanism of this embodiment is configured as described above, as shown in FIG. 2, the clamp arm 4 is driven by driving the air cylinder 7 in a direction in which the piston shaft 71b is retracted toward the rear body portion 71a. Is moved upward to be in a clamp release state, and in this state, the workpiece 9 is transferred to the clamp device by another conveying means. That is, the workpiece 9 is transferred in a state where the corner portion 81 of the chevron cross section of the workpiece 9 is placed on the piece 3.

  Next, as shown in FIG. 1, by driving the air cylinder 7 in a direction in which the piston shaft 71b protrudes forward from the main body 71a, the clamp arm 4 is rotated downward, The clamp 9 is in a clamped state in which the workpiece 9 is sandwiched between the two clamp pieces 6 and 6.

  As described above, in the clamping mechanism of this embodiment, the receiving portion 2 is provided with the spherical receiving piece 3, and the clamp portion 5 is centered on the receiving piece 2 and has a pair of clamping pieces 6. 6 is provided in a three-point support state, whereby the clamped object can be clamped in a stable state regardless of the shape of the clamped object such as the workpiece 9. The effect of being able to do it is obtained.

  Moreover, the clamp part 5 provided with a pair of clamp pieces 6 and 6 is provided so as to be able to swing with respect to the clamp arm 4, so that the delivery angle and position of the plate-like object to be clamped such as the workpiece 9 with respect to the clamp device are shifted. In this case, when only one clamp piece 6 comes into contact with the upper surface of the plate-like object such as the workpiece 9 at the time of clamping, the other clamp piece 6 comes into contact with three points by swinging the clamp portion 5. It becomes a support state. That is, when the clamp portion 5 is swung, it is possible to avoid the clamping force from being concentrated on one point at the initial stage of clamping even in the case of the three-point support structure.

  In addition, a stopper mechanism is provided between the clamp arm and the clamp part to regulate the swing range of the clamp part, so that the clamp part is greatly inclined in one direction before clamping. Can be prevented.

  In the clamp mechanism according to claim 5, as described above, the pair of clamp pieces provided in the clamp portion is formed in a spherical shape, and the spherical radius of the receiving piece is formed larger than the spherical radius of the clamp piece, Centering is easy, and stability at the time of clamping a plate-shaped object to be clamped can be improved.

As described above, the embodiments of the present invention have been described with reference to the drawings. However, the present invention is not limited to the above-described embodiments, and the present invention can be applied even if there is a design change or the like without departing from the gist of the present invention. included.
For example, in the embodiment, the example in which the clamp portion 5 including the pair of clamp pieces 6 and 6 is provided so as to be swingable with respect to the clamp arm 4 is described.

In the embodiment, the receiving piece 3 and the two clamp pieces 6 and 6 are formed in a hemispherical shape, but may be formed in a cross-sectional arc shape such as a bowl shape.
Moreover, the clamp pieces 6 and 6 do not necessarily have a circular arc shape or a hemispherical section.
Moreover, although the example provided with a pair of clamp pieces 6 and 6 having a predetermined interval around the receiving piece 2 is shown, the pair of clamp pieces 6 and 6 having a predetermined interval around the receiving piece 2 is not necessarily shown. May not be provided.

In the embodiment, the clamp arm 4 is rotated. However, the clamp arm 4 may be moved back and forth.
Moreover, although the example which provided the pair of clamp pieces 6 and 6 in the clamp part 5 side was shown in the Example, you may make it provide a pair of pieces with a predetermined space | interval in the receiving part 2 side. .

  In addition, a coil spring (attached) for returning the swing range of the clamp portion 5 to the center between the lower surface of the tip end portion of the crank arm 4 and the stopper receiving portions 51, 51 on the outer periphery of the stopper pins 43, 43 constituting the stopper mechanism. 2), the workpiece 9 such as the workpiece 9 can be clamped in a state where the swing angle of the clamp portion 5 is always centered. It will be possible to prevent concentration on.

It is a side view of the clamped state which shows the clamp mechanism of an Example. It is a side view of the clamp release state which shows the clamp mechanism of an Example. It is a principal part expanded side view of the clamp state which shows the clamp mechanism of an Example. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3. It is a side view which shows the clamp mechanism of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame main body 11 Bearing part 12 Bearing part 2 Receiving part 3 Receiving piece 4 Clamp arm 41 Support shaft 42 Horizontal part 42a Bearing part 43 Stopper pin (stopper mechanism)
44 Fixing nut 5 Clamping part 51 Stopper receiving part (stopper mechanism)
6 Clamping piece 7 Clamp arm rotating mechanism 71 Air cylinder 71a Body portion 71b Piston shaft 8 Workpiece mounting portion 81 Lifting support bar 9 Workpiece (plate-shaped sandwiched object)
91 Corner part

Claims (5)

A receiving portion provided on the frame main body and a clamp portion provided at the tip of a clamp arm rotatably provided on the frame main body, and a receiving piece formed on the receiving portion and the clamp portion A clamp mechanism facing the formed clamp piece,
One of the receiving piece or the clamp piece is formed in an arc shape in cross section,
The other of the receiving piece or the clamping piece is formed as a pair of pieces having a predetermined interval.   The receiving portion or the clamp portion formed as a pair of pieces having a predetermined interval among the receiving piece or the clamp piece is provided so as to be swingable with respect to the frame body or the clamp arm. The clamp mechanism according to claim 1.   Between the receiving piece or the clamp part and the frame body or the clamp arm formed as a pair of pieces having a predetermined interval between the receiving piece or the clamp piece, the swinging of the receiving part or the clamp part is between the frame body and the clamp arm. The clamp mechanism according to claim 2, further comprising a stopper mechanism that regulates a moving range.   4. The clamping mechanism according to claim 3, wherein the stopper mechanism is provided with a biasing means for returning the receiving part or the clamping part to the center of the swing range.   Of the receiving piece or the clamp piece, a piece formed by a pair of pieces having a predetermined interval is formed in an arc shape in cross section, and the radius of the arc of the other piece is formed larger than the radius of the arc of the pair of pieces. The clamp mechanism according to any one of claims 1 to 4, wherein the clamp mechanism is provided.

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