JP2021053709A - Swing-type clamp device - Google Patents

Abstract

To provide a swing-type clamp device, which is configured so that the concern about occurrence of a loss in a clamp arm is cleared away.SOLUTION: A clamp arm 32a is mounted on a movable turning shaft 22 through a block body 30a. In the clamp arm 32a is formed a storage recessed part 40 that stores a site where at least a shaft insertion hole 70 is formed, of the block body 30a. The storage recessed part 40 has a closed end 44 and an opened end 42. The closed end 44 is provided with a step part 59. In the block body 30a, a second protruding part 80 is provided at a position overlapping with the step part 59.SELECTED DRAWING: Figure 4

Description

The present invention relates to a swing type clamp device including a clamp arm that rotates from a clamp position to a clamp release position or in the opposite direction.

The swing type clamp device includes a rotary urging mechanism and a clamp arm whose one end is supported by a rotary urging mechanism and which rotates integrally with the rotation of the rotary shaft. To be equipped. The axis of rotation extends, for example, along the horizontal direction. In this configuration, the clamp arm rotates by about 90 ° from an upright posture extending in the vertical direction to a lying posture extending in the horizontal direction orthogonal to the extending direction of the rotation axis.

One of the positions in the standing posture or the lying posture is the clamp position for clamping the work, and the other is the clamp release position for releasing the work. That is, the clamp arm that has reached the clamp position by rotation further approaches the work integrally as the rotation shaft retracts so as to approach the work, thereby pressing the work. In other words, the work is restrained by a clamp arm that is displaced along the axial direction of the rotation shaft after rotation, whereby the work is positioned and fixed. On the other hand, when the rotation shaft moves forward so as to be separated from the work, the clamp arm is separated from the work along the axial direction of the rotation shaft. After that, the work is released from the restraint of the clamp arm by returning to the clamp release position by rotating the clamp arm in the opposite direction to the above.

Regarding this type of swing type clamp device, in Patent Document 1, a block body is externally fitted to a rotating shaft (“clamp rod” referred to in Patent Document 1), and a clamp arm is connected to the block body via a connecting pin. The configuration to be used is proposed. In other words, in this case, the clamp arm is supported by the rotating shaft via the block body. According to this configuration, the clamp arm can be reliably positioned and fixed with respect to the rotating shaft, and the load at the time of replacing the clamp arm can be reduced.

Japanese Patent No. 4866362

When the clamp arm clamps the work, it retracts so that the rotating shaft approaches the work as described above. Here, the clamp-side end of the clamp arm that clamps the work is a so-called free end that is not supported by any object. Therefore, at the time of this approach, the stress based on the pressing of the work is concentrated on the rotating side end of the clamp arm supported by the rotating shaft. In a configuration in which a block body is provided on the rotating shaft and a clamp arm is attached to the block body via a connecting pin, stress concentration is particularly likely to occur in the vicinity of the insertion hole through which the connecting pin is inserted.

When stress concentration occurs over a long period of time, fatigue accumulates in the clamp arm. Since fatigue causes defects such as cracks, it is desired to avoid stress concentration of the clamp arm and reduce fatigue as much as possible, thereby suppressing the occurrence of defects.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a swing type clamp device capable of dispelling the concern that a defect may occur in the clamp arm.

In order to achieve the above object, according to one embodiment of the present invention, the work is released from a rotation urging mechanism that rotationally urges the rotation shaft and a clamp position that clamps the work by the rotation urging mechanism. In a swing type clamp device provided with a clamp arm that rotates about the rotation axis in or in the opposite direction to the clamp release position.
A block body in which a shaft insertion hole through which the rotation shaft is inserted is formed, and
A connecting pin that connects the clamp arm and the block body accommodated in the accommodating recess formed in the clamp arm.
With
The clamp arm has a first wall portion facing the work and a second wall portion located on the back side of the first wall portion.
The accommodating recess is an open end that is opened at the first wall portion and is recessed from the first wall portion toward the second wall portion side, and is opened at one end surface in the extending direction of the clamp arm. It has a closed end, which is the opposite end of the open end, and has a closed end.
The closed end is connected to the first wall portion and projects from the block body in the accommodating recess in a direction in which the closed end is relatively separated from the block body with respect to the first protrusion. Includes a recessed portion that is depressed in, and a stepped portion formed by the first protrusion and the recessed portion.
The block body is provided on the surface facing the second wall portion facing the inner surface of the second wall portion in the accommodating recess, and the edge portion facing the second wall portion and the recessed portion, and faces the recessed portion. It has a second protrusion that protrudes and overlaps with the first protrusion, and includes a step facing surface facing the step and a recess facing surface facing the recess.
A swing type in which at least a part of the second wall facing surface is in contact with the inner surface of the second wall, and the step facing surface and the indentation facing surface are in contact with the step and the indenting portion, respectively. A clamping device is provided.

According to the present invention, the clamp arm and the block body are brought into surface contact at three points. In this configuration, the stress based on the pressing of the work acts on the block body through the three points in surface contact. Since many surface contact points are formed in this way, the stress generated as the clamp arm approaches the work is dispersed over a wide range. As a result, it is possible to prevent stress concentration from occurring at a predetermined portion of the clamp arm.

For the above reasons, the accumulation of fatigue in the clamp arm is avoided, so that the occurrence of defects in the clamp arm is effectively suppressed. Therefore, it is possible to eliminate the concern that the clamp arm may be damaged.

It is an overall schematic front view of the swing type clamp device which concerns on embodiment of this invention. It is an overall schematic perspective view of one in the clamp arm constituting the swing type clamp device of FIG. It is an exploded perspective view of the clamp arm of FIG. It is a side sectional view along the longitudinal direction of the clamp arm of FIG. 5A to 5C are schematic plan views of the vicinity of the end portion of the clamp arm, which is different from FIG. FIG. 4 is a side sectional view showing a state in which the clamp body is relatively raised with respect to the clamp arm. 1 is a schematic perspective view of a main part when the block body and the clamp arm are connected by connecting pins provided at locations different from those in FIGS. 1 to 4.

Hereinafter, suitable embodiments of the swing type clamp device according to the present invention will be described, and will be described in detail with reference to the accompanying drawings.

FIG. 1 is an overall schematic front view of the swing type clamp device 10 according to the present embodiment. The swing type clamp device 10 performs predetermined processing on the cylinder block 12 as a work by a multi-axis processing machine (not shown) or the like in an upright posture in which the cylinder block 12 extends along the vertical direction. belongs to. The cylinder block 12 is supported by a support column (not shown) provided on the support plate 14 constituting the swing type clamp device 10 so as to maintain an upright posture with the gasket surface as the front surface. Although the cylinder block 12 is simply shown in FIG. 1, in reality, there are steps and the like based on the difference in wall thickness.

The support plate 14 is provided with four drive cylinders 20 (rotational urging mechanisms) so as to extend along the horizontal direction from the back to the front of the paper surface. Each of the drive cylinders 20 is provided with an advance / retreat rotation shaft 22 (rotation shaft). The advancing / retreating rotation shaft 22 has a proximal end 24 which is an end close to the drive cylinder 20 and a distal end 26 which is an end away from the drive cylinder 20, and is in the vicinity of the proximal end 24. A step 27 is formed (particularly see FIG. 4). When the swing type clamp device 10 is viewed from the front, a part of the large-diameter retaining nut 28 provided at the distal end 26 is visible.

The advancing / retreating rotation shaft 22 is displaced along the direction orthogonal to the paper surface of FIG. 1 under the action of the driving cylinder 20. That is, the advancing / retreating rotation shaft 22 can move linearly (in other words, advancing / retreating operation) from the back to the front of the paper surface or in the opposite direction. On the other hand, the forward / backward rotation shaft 22 can also rotate about 90 ° clockwise or counterclockwise.

Clamp arms 32a to 32d are supported on the advancing / retreating rotation shaft 22 via each of a plurality of (in this case, four) block bodies 30a to 30d. The configurations of the block bodies 30a to 30d and the clamp arms 32a to 32d will be described with reference to the block bodies 30a and the clamp arms 32a shown in FIGS. In the following, the side of the block body 30a and the clamp arm 32a facing the drive cylinder 20 is the "proximal end side", and the side visually recognized when the swing type clamp device 10 is viewed from the front is the "distal end side". It may be written as.

The clamp arm 32a is a long member extending linearly and has a substantially rectangular parallelepiped shape. Therefore, the clamp arm 32a has a first wall portion 33 facing (facing) the cylinder block 12 and a second wall portion 34 located on the back side thereof. When the swing type clamp device 10 is viewed from the front, the second wall portion 34 can be visually recognized. In the following, "proximal end side" is synonymous with "first wall side", and "distal end side" is synonymous with "second wall side".

Further, in the following, the side to which the block body 30a is connected may be referred to as a "rotating side", and the side that clamps the cylinder block 12 may be referred to as a "clamping side". That is, the clamp arm 32a has a rotation side portion 35 and a clamp side portion 36. Therefore, one end of the clamp arm 32a in the extending direction is the rotation side end portion which is the end portion of the rotation side portion 35, and the other end on the opposite side is the clamp side which is the end portion of the clamp side portion 36. It is the end.

The height of the clamp arm 32a (dimensions from the first wall portion 33 to the second wall portion 34) is set so that the rotation side portion 35 is large and the clamp side portion 36 is small. Therefore, an inclined portion 38 whose height gradually decreases from the rotating side portion 35 toward the clamp side portion 36 is formed substantially in the middle of the extending direction of the clamp arm 32a.

The first wall portion 33 is set to be shorter than the second wall portion 34. That is, the clamp arm 32a has a shape in which the rotation side end portion of the first wall portion 33 is cut off. Therefore, in the rotation side portion 35, the accommodating recess 40 is formed as a concave space that is opened at the first wall portion 33 and is recessed from the first wall portion 33 toward the second wall portion 34. One end of the accommodating recess 40 is an open end 42 opened at the rotating side end of the clamp arm 32a. The clamp-side end of the accommodating recess 40 is located near the boundary between the rotation-side portion 35 and the inclined portion 38. The clamp arm 32a is solid except for the portion where the accommodating recess 40 is formed. Therefore, the clamp-side end of the accommodating recess 40, which is the end opposite to the rotation-side end, is the closed end 44.

The first pin insertion hole 48 and the second pin insertion hole 50 penetrating the accommodating recess 40 are provided on both side walls of the rotation side portion 35 substantially orthogonal to the first wall portion 33 and the second wall portion 34. It is formed. As will be described later, the block body 30a is positioned and fixed in the accommodating recess 40 by fitting the first connecting pin 52 and the second connecting pin 54 into the first pin insertion hole 48 and the second pin insertion hole 50, respectively. Will be done. Further, in the rotating side portion 35, an engaging groove 56a connected to both the accommodating recess 40 and the open end 42 is formed so that a part of the second wall portion 34 is cut out.

The closed end 44 includes a first protrusion 57, a recessed portion 58 that is recessed relative to the first protrusion 57, and a stepped portion 59 formed by the first protrusion 57 and the recessed portion 58. .. More specifically, the first protrusion 57 is connected to the first wall 33 and projects toward the block body 30a in the accommodating recess 40. Due to this protrusion, an indented portion 58 that is recessed in a direction relatively separated from the block body 30a is formed at the closed end 44. Further, the first protrusion 57 and the indentation 58 form a step portion 59 as a surface on the distal end side of the first protrusion 57. Therefore, the accommodating recess 40 is formed by the wall surface of the first protrusion 57, the wall surface of the recessed portion 58, the wall surface of the step portion 59, and the inner surface of the second wall portion 34.

Here, the second wall portion 34 is formed with a window 60 at a portion close to the inclined portion 38. When the block body 30a is not accommodated in the accommodating recess 40 (the block body 30a is separated from the accommodating recess 40), the step portion 59 can be visually recognized from the window 60. The window 60 is located on the distal end side of the second pin insertion hole 50.

The first wall portion 33 of the clamp-side portion 36 is formed with a curved recess 62 having a shape that is recessed toward the second wall portion 34 and is cut out so as to have an arc shape on the inner surface thereof. Further, from the curved recess 62 to the second wall portion 34, the small-diameter holes 64 and the large-diameter holes 66 having a substantially circular cross section are connected in this order. The annular step portion 68 is formed by the diameter difference between the small diameter hole 64 and the large diameter hole 66.

The block body 30a is housed in the housing recess 40. The longitudinal dimension of the block body 30a is substantially the same as the longitudinal dimension of the accommodating recess 40. In the intermediate portion in the longitudinal direction where the height of the block body 30a is small, a shaft insertion hole 70 for fitting the advancing / retreating rotation shaft 22 (see FIGS. 1 and 4) is provided from the proximal end side end face to the distal end side end face. It is formed to penetrate over. The clamp-side end of the shaft insertion hole 70 is exposed in the vicinity of the rotation-side end of the window 60.

The advancing / retreating rotation shaft 22 is passed through the shaft insertion hole 70 from the distal end 26. That is, the proximal end 24 faces the opening of the proximal end side end face of the shaft insertion hole 70, and the distal end 26 faces the opening of the distal end side end face. The block body 30a is sandwiched by the step portion 27 formed on the advancing / retreating rotation shaft 22 and the retaining nut 28 screwed into the distal end 26, and the advancing / retreating rotation shaft 22 is pulled out from the shaft insertion hole 70. It has been stopped. A part of the retaining nut 28 is exposed in the vicinity of the rotation side end portion of the window 60. In FIG. 2, the retaining nut 28 is not shown in order to facilitate understanding of the formation position of the shaft insertion hole 70.

In the block body 30a, a first pin receiving hole 72 and a second pin receiving hole 74 are formed at locations facing the first pin insertion hole 48 and the second pin insertion hole 50. When the block body 30a is housed in the housing recess 40, the first pin receiving hole 72 is interposed between the first pin insertion holes 48, and the second pin receiving hole 74 is located between the second pin insertion holes 50. Intervenes. The first connecting pin 52 is inserted into the first pin insertion hole 48 and the first pin receiving hole 72, and the second connecting pin 54 is inserted into the second pin insertion hole 50 and the second pin receiving hole 74. , The clamp arm 32a is held by the block body 30a. The shaft insertion hole 70 is located between the first connecting pin 52 and the second connecting pin 54.

The first connecting pin 52 and the second connecting pin 54 are provided with screw portions, and the screw portions are screwed into the screw portions formed on the plug nut 76, respectively. The plug nut 76 prevents the first connecting pin 52 and the second connecting pin 54 from coming off. Alternatively, a known snap pin having a wavy portion and a linear portion may be used to prevent the first connecting pin 52 and the second connecting pin 54 from coming off. In this case, an insertion hole extending in a direction orthogonal to the axial direction (that is, a diameter direction) is formed in the first connecting pin 52 and the second connecting pin 54, and a linear portion is inserted into the insertion hole. Moreover, the corrugated portion may be fitted onto the first connecting pin 52 and the second connecting pin 54.

Further, the block body 30a is provided with a second protrusion 80 protruding toward the invaginated portion 58 of the closed end 44 at the edge portion on the distal end side facing the second wall portion 34 and the invaginated portion 58. As shown in FIG. 4, the second protrusion 80 overlaps the first protrusion 57 of the closed end 44. Then, the stepped portion facing surface 110 of the second protrusion 80 facing the proximal end side and facing the stepped portion 59 abuts on the stepped portion 59 so as to overlap the step portion 59. Further, the recessed portion facing surface 112 of the second protrusion 80 facing the clamp side end portion and facing the recessed portion 58 abuts on the recessed portion 58. Further, on the open end 42 side of the accommodating recess 40, the second wall facing surface 114 of the block body 30a facing the inner surface of the second wall 34 is the inner surface of the rotating side portion 35 of the second wall 34. Contact.

As described above, in the block body 30a, at least three surfaces of the stepped portion facing surface 110 and the recessed portion facing surface 112 of the second protrusion 80 and the second wall portion facing surface 114 on the open end 42 side are accommodating recesses. Surface contact with the inner surface of 40. That is, the clamp arm 32a and the block body 30a come into surface contact with each other at three points. The end face of the block body 30a on the proximal end side of the second protrusion 80 (the end face close to the first wall portion 33) may be in contact with the rotation side end face of the first protrusion 57. However, it does not have to be in contact with each other.

On the second wall portion facing surface 114 of the block body 30a, an engaging projection 82a protruding toward the second wall portion 34 side is provided in the vicinity of the rotation side end portion. When the engaging projection 82a enters the engaging groove 56a, the block body 30a and the accommodating recess 40 are aligned with each other.

In the curved recess 62, a clamp body 84a made of a relatively soft material such as rubber and in contact with the cylinder block 12 is arranged. The second wall side end surface of the clamp body 84a is curved so as to match the inner surface of the curved recess 62. A stepped screw hole 86 is formed on the second wall portion 34 side of the clamp body 84a.

A small-diameter cylindrical portion 92 and a large-diameter disk portion 94 of the collar 90 are inserted into the small-diameter hole 64 and the large-diameter hole 66, respectively. A play is formed between the inner wall of the small diameter hole 64 and the cylindrical portion 92, and between the inner wall of the large diameter hole 66 and the disk portion 94, respectively. Further, the end surface on the first wall side of the cylindrical portion 92 is seated on the stepped surface of the stepped screw hole 86. On the other hand, the end surface of the disk portion 94 on the first wall portion side faces the annular step portion 68 between the large diameter hole 66 and the small diameter hole 64. The diameter of the disk portion 94 is set larger than the diameter of the small diameter hole 64. As a result, the collar 90 is prevented from coming off toward the curved recess 62 side.

The collar 90 is formed with a screw insertion hole 96 penetrating along the longitudinal direction from the end surface on the side of the first wall portion to the end surface on the side of the second wall portion. The proximal end side end of the fastening screw 98 passed through the screw insertion hole 96 is screwed into the stepped screw hole 86. By this screwing, the clamp body 84a is held by the clamp arm 32a via the collar 90.

Here, the clamp body 84a and the collar 90 are not connected to the clamp arm 32a. Further, as described above, a play is formed between the collar 90 and the small diameter hole 64 and the large diameter hole 66. Therefore, the clamp body 84a and the collar 90 easily move toward the distal end side (large diameter hole 66 side) when an external force is applied from the proximal end side. In this way, the clamp body 84a is floatingly supported with respect to the clamp side portion 36 of the clamp arm 32a.

The remaining clamp arms 32b to 32d, block bodies 30b to 30d, and clamp bodies 84b to 84d are formed in the same manner as the clamp arm 32a, block body 30a, and clamp body 84a except for the points described later. Therefore, the same reference numerals are given to the corresponding components, and detailed description thereof will be omitted.

5A to 5C are schematic plan views of the vicinity of the rotating side ends of the clamp arms 32b to 32d. As can be understood with reference to FIGS. 1, 2 and 5A to 5C, in the clamp arms 32a to 32d, the positions where the engaging grooves 56a to 56d are formed are different from each other. On the other hand, in the block bodies 30a to 30d, the positions where the engaging protrusions 82a to 82d are provided are different from each other.

The engaging protrusions 82a to 82d are provided at locations corresponding to the respective locations where the engaging grooves 56a to 56d are formed, respectively. That is, for example, the position of the engaging projection 82a corresponds only to the forming position of the engaging groove 56a, and does not correspond to the forming position of the engaging grooves 56b to 56d. Similarly, the position of the engaging protrusion 82b corresponds only to the forming position of the engaging groove 56b, and does not correspond to the forming position of the engaging grooves 56a, 56c, 56d. Further, the position of the engaging projection 82c corresponds only to the forming position of the engaging groove 56c, not the forming position of the engaging grooves 56a, 56b, 56d, and the position of the engaging projection 82d corresponds to the forming position of the engaging groove 56d. It corresponds only to the forming position, and does not correspond to the forming position of the engaging grooves 56a to 56c. Therefore, each of the engaging protrusions 82a to 82d can enter only the engaging grooves 56a to 56d having the corresponding positions.

The clamp bodies 84a to 84d are each set to appropriate dimensions according to the shape of the contact portion of the cylinder block 12. That is, the thickness, width, and the like are different from each other.

The swing type clamp device 10 according to the present embodiment is basically configured as described above, and the effects thereof will be described next.

The clamp arms 32a to 32d are manufactured, for example, by subjecting the cast body to machining such as cutting. Here, by forming the window 60 with the core at the time of casting, it becomes easy to insert various tools from the window 60 into the accommodating recess 40 at the time of cutting. Therefore, the stepped portion 59 can be processed with high accuracy.

In order to assemble the clamp arm 32a to the block body 30a, the block body 30a in which the advancing / retreating rotation shaft 22 is fitted into the shaft insertion hole 70 from the distal end side is inserted from the open end 42 of the accommodating recess 40. At this time, the second protrusion 80 is directed toward the closed end 44, and the open end side end of the block body 30a is exposed from the open end 42 in order to prevent the second protrusion 80 from interfering with the step portion 59. Of course. Then, with this insertion, the second wall portion facing surface 114 (the end surface facing the distal end) in the accommodating recess 40 of the open end side end portion of the block body 30a comes into contact with the inner surface of the second wall portion 34.

Next, the clamp arm 32a is moved to the open end side end side of the block body 30a, and the second protrusion 80 of the block body 30a is relatively moved to the closed end 44 side. At the time of this movement, the second wall portion facing surface 114 of the block body 30a is in sliding contact with the inner surface of the second wall portion 34, and the engagement projection 82a enters the engagement groove 56a. Finally, the stepped portion facing surface 110 of the second protrusion 80 facing the stepped portion 59 overlaps and abuts on the stepped portion 59 forming the closed end 44. In addition, the recessed portion facing surface 112 of the second protrusion 80 facing the recessed portion 58 comes into contact with the recessed portion 58. By forming the window 60, this contact can be easily visually confirmed from the window 60. Further, the second wall portion facing surface 114 of the block body 30a comes into contact with the inner surface of the second wall portion 34.

Further, the first pin receiving hole 72 and the second pin receiving hole 74 are interposed between the first pin insertion holes 48 and the second pin insertion holes 50 formed on the side wall of the clamp arm 32a, respectively. The first connecting pin 52 is inserted into the first pin insertion hole 48 and the first pin receiving hole 72, and the second connecting pin 54 is inserted into the second pin insertion hole 50 and the second pin receiving hole 74. Then, the plug nut 76 is screwed into the first connecting pin 52 and the second connecting pin 54 to prevent the first connecting pin 52 and the second connecting pin 54 from coming off. As a result, the clamp arm 32a is held by the advancing / retreating rotation shaft 22 via the block body 30a.

The clamp arms 32a to 32d are sufficiently held by the block bodies 30a to 30d by the first connecting pin 52 located on the rotation side of the shaft insertion hole 70. Therefore, since the number of connecting pins can be reduced, the time required for attaching or replacing the clamp arms 32a to 32d with respect to the block bodies 30a to 30d can be shortened. Moreover, since the number of parts is reduced, the cost can be reduced. By arranging the first connecting pin 52 and the second connecting pin 54 so as to sandwich the shaft insertion hole 70, the thrust of the advancing / retreating rotating shaft 22 is the portion of the block body 30a on the closed end 44 side and the open end 42 side. It is transmitted to the site almost evenly.

Here, the engaging projection 82a can enter only the engaging groove 56a, and cannot enter the engaging grooves 56b to 56d. As described above, the engaging grooves 56b to 56d do not correspond to the positions of the engaging protrusions 82a, and therefore, even if the engaging protrusions 82a are attempted to enter the engaging grooves 56b to 56d, the clamp arms 32b to 56d This is because the second wall portion 34 of 32d interferes with the engaging projection 82a. Therefore, only the clamp arm 32a in which the engaging groove 56a is formed can be assembled to the block body 30a. That is, the clamp arms 32b to 32d cannot be attached to the block body 30a. As described above, the positions where the engagement grooves 56a to 56d are formed in the clamp arms 32a to 32d and the installation positions of the engagement protrusions 82a to 82d in the block bodies 30a to 30d are different from each other (FIGS. 1, 2 and 5A). -Refer to FIG. 5C), it is possible to prevent erroneous assembly.

The first index is common to the clamp arm 32a, the block body 30a and the clamp body 84a, the second index common to the clamp arm 32b, the block body 30b and the clamp body 84b, and common to the clamp arm 32c, the block body 30c and the clamp body 84c. Incorrect assembly can also be prevented by joining the third index, the fourth index common to the clamp arm 32d, the block body 30d, and the clamp body 84d, respectively.

In the same manner as described above, the clamp arms 32b to 32d are held by the advancing / retreating rotation shaft 22 via the block bodies 30b to 30d. In this case as well, it goes without saying that erroneous assembly is prevented.

When the cylinder block 12 is clamped by the swing type clamp device 10 to which the clamp arms 32a to 32d are assembled in this way, first, the cylinder block 12 is attached to the gasket surface by the support column provided on the support plate 14. It is supported in an upright position as the front (see FIG. 1). At this time, the clamp arms 32a to 32d are in an upright posture extending along the vertical direction and are in the clamp release position. At this time, the forward / backward rotation shaft 22 is located at the forward end. Therefore, the clamp arms 32a to 32d are located at positions relatively separated from the cylinder block 12.

Next, the advancing / retreating rotation shaft 22 rotates by about 90 ° under the action of the drive cylinder 20. Following this, the clamp arms 32a to 32d rotate around the advancing / retreating rotation shaft 22 as a rotation center, and as shown by a virtual line in FIG. 1, the clamp arms 32a to 32d are in a lying posture extending along the horizontal direction. The rotation directions of the clamp arms 32a and 32c are counterclockwise, and the rotation directions of the clamp arms 32b and 32d are clockwise. When the rotation of the clamp arms 32a to 32d is completed, in other words, when the clamp arms 32a to 32d are in the clamp position, the clamp bodies 84a to 84d face the cylinder block 12.

At this point, the clamp arms 32a to 32d and the clamp bodies 84a to 84d are in the forward positions as described above. Therefore, it is possible to prevent the cylinder block 12 from interfering with the clamp bodies 84a to 84d while the clamp arms 32a to 32d are rotating, and to prevent the rotation of the clamp arms 32a to 32d from being stopped due to this interference. Cylinder.

Next, under the action of the drive cylinder 20, all the advancing / retreating rotation shafts 22 retract from the front side to the back side of the paper surface in FIG. Along with this, the block bodies 30a to 30d in which the advancing / retreating rotation shaft 22 is fitted in the shaft insertion hole 70 and the clamp arms 32a to 32d assembled in the block bodies 30a to 30d are on the front side of the paper in FIG. Retreat toward the back from. Therefore, the clamp bodies 84a to 84d are integrally displaced with the clamp arms 32a to 32d in a direction relatively close to the cylinder block 12.

At the time of approaching, stress based on the pressing of the cylinder block 12 (work) by the clamp arms 32a to 32d acts on the block bodies 30a to 30d. Here, the stress hits the second wall portion facing surface 114 in contact with the inner surface of the second wall portion 34, the indentation portion facing surface 112 of the second protrusion 80 in contact with the indentation portion 58, and the step portion 59. It is transmitted from the clamp arms 32a to 32d to the block bodies 30a to 30d via the three surfaces of the stepped portion facing surfaces 110 of the second protruding portion 80 in contact with each other. Therefore, the stress is distributed over a wide area. That is, according to the present embodiment, it is possible to prevent stress concentration from occurring in the vicinity of the second pin insertion hole 50 and the first pin insertion hole 48 of the clamp arms 32a to 32d.

Therefore, it is possible to prevent fatigue from accumulating on the clamp arms 32a to 32d (particularly on both side walls). Therefore, it is possible to eliminate the concern that the clamp arms 32a to 32d may be damaged. This is because it is difficult for fatigue to accumulate, and thus the occurrence of defects in the clamp arms 32a to 32d is effectively suppressed.

When the retreat of the clamp arms 32a to 32d is completed, the clamp bodies 84a to 84d come into contact with the cylinder block 12. As described above, erroneous assembly is prevented, and the clamp bodies 84a to 84d are set to dimensions according to the shape of the contact portion, so that the clamp bodies 84a to 84d are brought closer to the cylinder block 12. By letting the cylinder block 12 come into contact with the cylinder block 12 reliably.

When the clamp bodies 84a to 84d are positioned and fixed excessively firmly with respect to the clamp arms 32a to 32d, the pressing force of the clamp bodies 84a to 84d on the cylinder block 12 may increase. In this case, there is a concern that the cylinder block 12 may be damaged by pressing.

However, in the present embodiment, the clamp bodies 84a to 84d are floatingly supported with respect to the clamp arms 32a to 32d. Therefore, when the clamp bodies 84a to 84d come into contact with the cylinder block 12, the clamp bodies 84a to 84d receive a reaction force of pressing from the cylinder block 12. Depending on the magnitude of the undulations of the cylinder block 12, the clamp bodies 84a to 84d are integrally displaced with the collar 90 toward the inner surface of the curved recess 62 due to the reaction force, as shown in FIG. In other words, the clamp bodies 84a to 84d rise relative to the clamp arms 32a to 32d. The clamp bodies 84a to 84d can be displaced until the end surface on the second wall portion side abuts on the inner surface of the curved recess 62.

As described above, in the present embodiment, the clamp bodies 84a to 84d can be displaced according to the shape of the cylinder block 12. Therefore, when the clamp bodies 84a to 84d come into contact with the cylinder block 12, it is possible to prevent the cylinder block 12 from being scratched.

When the cylinder block 12 is pressed by the clamp bodies 84a to 84d as described above, the cylinder block 12 is clamped and supported by the support plate 14. The cylinder block 12 is subjected to predetermined machining with a multi-axis machine or the like. After that, the advancing / retreating rotation shaft 22 advances under the action of the drive cylinder 20, and in this state, the clamp arms 32a and 32c rotate clockwise and the clamp arms 32b and 32d rotate counterclockwise to take an upright posture. .. That is, the clamp arms 32a to 32d return to the clamp release position.

When replacing the clamp arms 32a to 32d as needed, the same work as the above assembly may be performed. In this case, by providing the block bodies 30a to 30d, it becomes easy to replace the clamp arms 32a to 32d as in the technique described in Patent Document 1.

The present invention is not particularly limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

For example, as shown in FIG. 7, pin insertion holes 98a and 98b are formed along the longitudinal direction of the block body 30a, pin receiving holes are formed at the closed end 44, and connecting pins inserted into the pin insertion holes 98a and 98b. 100a and 100b may be screwed into the pin receiving holes. In this case, by providing the connecting pins 100a and 100b so as to sandwich the advancing / retreating rotation shaft 22, the thrust of the advancing / retreating rotation shaft 22 can be evenly transmitted to the block body 30a. Although the block body 30a is illustrated in FIG. 7, the block bodies 30b to 30d can also have the same configuration.

10 ... Swing type clamp device 12 ... Cylinder block 20 ... Drive cylinder 22 ... Advance / retreat rotation shaft 24 ... Proximal end 26 ... Distal end 30a to 30d ... Block body 32a to 32d ... Clamp arm 33 ... First wall portion 34 ... Second wall portion 35 ... Rotating side portion 36 ... Clamp side portion 40 ... Accommodating recess 42 ... Open end 44 ... Closed end 48, 50, 98a, 98b ... Pin insertion holes 52, 54, 100a, 100b ... Connecting pin 56a ~ 56d ... Engagement groove 57 ... First protrusion 58 ... Intrusion part 59 ... Step portion 60 ... Window 70 ... Shaft insertion holes 72, 74 ... Pin receiving holes 80 ... Second protrusions 82a to 82d ... Engagement protrusions 84a ~ 84d ... Clamp body 90 ... Color 110 ... Stepped portion facing surface 112 ... Indented portion facing surface 114 ... Second wall portion facing surface

Claims (6)

With the rotation shaft as the center, the rotation urging mechanism that rotationally biases the rotation shaft and the clamp release position that releases the work from the clamp position that clamps the work by the rotation urging mechanism, or vice versa. In a swing type clamp device including a rotating clamp arm,
A block body in which a shaft insertion hole through which the rotation shaft is inserted is formed, and
A connecting pin that connects the clamp arm and the block body accommodated in the accommodating recess formed in the clamp arm.
With
The clamp arm has a first wall portion facing the work and a second wall portion located on the back side of the first wall portion.
The accommodating recess is an open end that is opened at the first wall portion and is recessed from the first wall portion toward the second wall portion side, and is opened at one end surface in the extending direction of the clamp arm. It has a closed end, which is the opposite end of the open end, and has a closed end.
The closed end is connected to the first wall portion and projects from the block body in the accommodating recess in a direction in which the closed end is relatively separated from the block body with respect to the first protrusion. Includes a recessed portion that is depressed in, and a stepped portion formed by the first protrusion and the recessed portion.
The block body is provided on the surface facing the second wall portion facing the inner surface of the second wall portion in the accommodating recess, and the edge portion facing the second wall portion and the recessed portion, and faces the recessed portion. It has a second protrusion that protrudes and overlaps with the first protrusion, and includes a step facing surface facing the step and a recess facing surface facing the recess.
A swing type in which at least a part of the second wall facing surface is in contact with the inner surface of the second wall, and the step facing surface and the indentation facing surface are in contact with the step and the indenting portion, respectively. Clamping device. In the clamp device according to claim 1, a swing type clamp in which a window is formed on the second wall portion of the clamp arm so that the step portion can be visually recognized when the block body is separated from the accommodating recess. apparatus. In the clamp device according to claim 1 or 2, the connecting pin extends at least in a direction orthogonal to the extending direction of the clamp arm, and is provided on the open end side of the rotating shaft. Swing type clamp device having pieces. In the clamp device according to claim 1 or 2, the swing type clamp device having at least two connecting pins extending along the extending direction of the clamp arm and sandwiching the rotating shaft. The clamp device according to any one of claims 1 to 4, further comprising a clamp body that abuts on the work at a clamp position, and the clamp body is held by a floating support on the clamp arm. .. The clamp device according to any one of claims 1 to 5, further comprising the rotary urging mechanism, the clamp arm, and a plurality of the block bodies.
Engagement grooves connected to the accommodating recess and the open end are formed in different places in each of the plurality of clamp arms, while engaging protrusions are provided in different places in each of the plurality of block bodies. Be,
A swing-type clamp device in which each of the engaging protrusions enters only one engaging groove formed in a portion corresponding to the portion where the engaging protrusion is provided.

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