JP4866362B2 - Swing type clamp device - Google Patents

Description

  The present invention relates to a swing type clamp device that moves a clamp arm forward and backward and swings the clamp arm.

  Conventionally, the swing type clamp device includes a clamp body, a clamp rod, a clamp arm, and a drive mechanism. A clamp rod is supported on the clamp body so as to be able to advance and retreat in the axial direction and rotate around the axial center, and a clamp arm is fixed to a tip portion of the clamp rod. A drive mechanism is provided in the clamp body. By this drive mechanism, the clamp arm moves to the retracted side in the axial direction with respect to the clamp released position, and over the clamped position swung around the axial center. The clamp rod is driven to move forward and backward and pivotally driven so as to be switchable.

  In this type of swing-type clamp device, even when the object to be clamped is changed, it can be dealt with by replacing the clamp arm with a clamp arm having a different size and shape. By the way, normally, the clamp arm is directly fixed to the clamp rod with a bolt or the like. For example, in the clamp device of Patent Document 1, a shaft hole in which a tip portion of a clamp rod is fitted and a slit communicating with the shaft hole are formed in the clamp arm. A bolt is inserted into the clamp arm so as to pass through the slit, and the clamp arm is fastened by this bolt and directly fixed to the clamp rod.

Here, in the swing type clamp device, the clamp arm moves forward and backward and swings. Therefore, in order to securely clamp and release the clamp object, the clamp arm is securely positioned at the intended position with respect to the clamp rod. Need to be fixed.
US Pat. No. 5,191,063

  The conventional swing type clamp device basically does not have a function of positioning the clamp arm on the clamp rod. Therefore, when exchanging the clamp arm, the work of positioning and fixing the clamp arm at the desired position with respect to the clamp rod, that is, the load of exchanging the clamp arm is increased. When the clamp arm is frequently replaced mainly based on the change of the clamp object, it is very inconvenient because it requires a heavy load to position and fix the clamp arm to the clamp rod each time. .

The clamp device of Patent Document 1 is such that the clamp arm is directly fixed to the clamp rod and has a function of positioning the clamp arm in the axial direction on the clamp rod, but does not have a function of positioning around the axis. . Therefore, the same problem as described above occurs.
An object of the present invention is to provide a swing-type clamp device that can easily and securely position and attach a clamp arm to a clamp rod at an intended position, and can reliably reduce the load of replacing the clamp arm. Is to provide.

  The swing-type clamp device according to claim 1 is attached to a clamp body, a clamp rod supported by the clamp body so as to be movable forward and backward in an axial direction and rotatable about the axis, and a tip portion of the clamp rod. The clamp rod is driven forward and backward so that it can be switched over between the clamp arm and the clamp release position and the clamp position moved to the axial retreat side with respect to the clamp release position and swung around the axial center. In addition, in the swing type clamp device provided with a driving means for rotationally driving, an attachment block fixed to the tip portion of the clamp rod and detachably attached to the clamp arm, and the clamp arm is positioned on the attachment block At least one clamping force transmission pin that is integrally connected in a state I, is characterized in that a clamping force transmitting pins which are inserted from the attachment block and the direction parallel to the axis-orthogonal direction to the clamp arm.

Here, the following configuration can be adopted in the invention of claim 1.
The attachment block is provided with a positioning portion for positioning the clamp arm in the axial direction and around the axial center. The clamp arm is attached to the attachment block so as to fit externally (Claim 3). The attachment block is formed in a rectangular block shape, and a rectangular hole in which the attachment block is fitted is formed in the clamp arm. A tip end portion of the clamp rod is formed in a taper shaft portion whose diameter decreases toward the tip end side, and a taper shaft hole into which the taper shaft portion is fitted is formed in the attachment block. The attachment block is formed with a shaft hole in which the tip end portion of the clamp rod is fitted, and a dividing portion connected to the shaft hole. Fastening bolts to be fixed in a shape are provided (claim 6).

  The swing-type clamp device according to claim 7 is attached to a clamp body, a clamp rod supported by the clamp body so as to be movable forward and backward in an axial direction and rotatable about the axis, and a tip portion of the clamp rod. The clamp rod is driven forward and backward so that it can be switched over between the clamp arm and the clamp release position and the clamp position moved to the axial retreat side with respect to the clamp release position and swung around the axial center. And a swing type clamping device having a driving means for rotationally driving, an attachment block fixed to the tip end portion of the clamp rod and detachably mounted with a clamp arm, and one of the attachment block and the clamp arm. , Clamping force transmission pin provided in the direction orthogonal to the axis center A pin engaging portion which is provided on the other of the attachment block and the clamp arm and engages with the pin portion so that the both can be integrally connected in a state where the clamp arm is attached to the attachment block. When the clamp arm is attached and detached, the pin portion is configured to be disengaged from the pin engaging portion from a direction perpendicular to the axial direction and perpendicular to the center line direction of the pin portion. .

Here, the following configuration can be adopted in the invention of claim 7.
A pin hole formed in the attachment block and the clamp arm in a penetrating manner in parallel with the center line direction of the pin portion, and a clamp force transmitting pin inserted through the pin hole. The pin portion and the clamp force transmission pin are disposed on both sides of the clamp rod in the length direction of the clamp arm. One clamp force transmission pin member is inserted in one of the attachment block and the clamp arm, and the pin portion is configured by the clamp force transmission pin member. The attachment block is formed in a rectangular block shape, a bifurcated portion is formed in the proximal end side portion of the clamp arm, and the proximal end open shape in which the attachment block is accommodated in an inner fitting shape in a portion including the bifurcated portion of the clamp arm Is formed (claim 11).

  The pair of pin portions and the pin engaging portion are provided symmetrically in the width direction of the clamp arm, and the pair of pin portions are disposed closer to the proximal end side of the clamp arm than the clamp force transmission pin, and the attachment block The pair of pin engaging portions are formed of a pair of U-shaped grooves cut out from the proximal end on the bifurcated portion of the clamp arm (claim 12). The pin portion is disposed on the proximal end side of the clamp arm with respect to the clamp force transmission pin and is attached to the bifurcated portion of the clamp arm, and the pin engaging portion is notched from the proximal end portion to the attachment block. It is made of a U-shaped groove formed (claim 13). A contact surface capable of contacting a smooth surface parallel to the direction perpendicular to the axis of the pin engaging portion is formed on the outer peripheral portion of the pin portion.

  According to the swing type clamp device of the first aspect, in particular, the attachment block fixed to the tip portion of the clamp rod and the clamp arm is detachably attached to the attachment block is integrally connected with the clamp arm positioned. And at least one clamping force transmission pin that is inserted into the attachment block and the clamp arm from the direction orthogonal to the axial center and in the parallel direction. Therefore, when replacing the clamp arm, first, the clamp force transmission pin is pulled out from the attachment block and the clamp arm to release the connection between the attachment block and the clamp arm, and then the clamp arm is removed from the attachment block. Next, attach a new clamp arm to the attachment block, and then insert the clamp force transmission pin through the attachment block and clamp arm from the direction perpendicular to the axis and parallel to the attachment block. Can be linked together. In other words, by positioning and fixing the attachment block at the desired position with respect to the clamp rod in advance, the clamp arm can be easily positioned and attached to the desired position with respect to the clamp rod (attachment block). This clamp force transmission pin can be easily mounted without fastening the clamp arm to the attachment block, and as a result, the load of the clamp arm replacement work can be reduced reliably, especially when the clamp arm is frequently replaced In addition, the load for exchanging the clamp arms can be remarkably reduced, which is very convenient.

  According to the swing type clamp device of the second aspect, the attachment block is provided with the positioning portion for positioning the clamp arm in the axial direction and around the axial center. Therefore, by attaching the clamp arm to the attachment block, it can be easily and reliably positioned at a connectable position, and in this state, the clamp force transmission pin can be easily inserted into the attachment block and the clamp arm. Replacement work can be performed more easily and reliably.

  According to the swing type clamp device of the third aspect, the clamp arm is mounted on the attachment block in an outer fitting manner. Accordingly, the clamping force transmission pin can be securely inserted into the attachment block and the clamp arm from the direction orthogonal to the axis and parallel to the attachment block, and the clamping arm can be reliably and integrally connected to the attachment block with the clamping force transmission pin. .

  According to the swing type clamp device of the fourth aspect, the attachment block is formed in a rectangular block shape, and the rectangular hole in which the attachment block is fitted is formed in the clamp arm. That is, since the clamp arm can be externally attached to the attachment block, the same effects as in the third aspect can be obtained, and the clamp arm can be reliably positioned around the axis center of the attachment block with a simple structure.

  According to the swing type clamp device of the fifth aspect, the taper shaft portion whose diameter decreases toward the tip end side is formed at the tip portion of the clamp rod, and the taper shaft hole into which the taper shaft portion is fitted is formed in the attachment block. Therefore, by pressing the attachment block toward the axially retracted side, the attachment block can be securely fixed in close contact with the tip portion of the clamp rod.

  According to the swing type clamping device of the sixth aspect, the attachment block is formed with the shaft hole into which the tip portion of the clamp rod is fitted and the dividing portion connected to the shaft hole, and the attachment block is fastened through the dividing portion. A fastening bolt that is elastically deformed and fixed in close contact with the tip of the clamp rod is provided. Therefore, the attachment block can be securely fixed in close contact with the tip portion of the clamp rod.

  According to the swing type clamp device of the seventh aspect, in particular, an attachment block fixed to the tip end portion of the clamp rod and to which the clamp arm is detachably mounted is provided, and one of the attachment block and the clamp arm has a direction perpendicular to the axis. A pin portion for transmitting a clamping force is provided in a direction parallel to the pin portion, and the pin portion is engaged with the other of the attachment block and the clamp arm so that the both can be integrally connected in a state where the clamp arm is attached to the attachment block. When the pin engaging part is provided and the clamp arm is attached to and detached from the attachment block, the pin part is engaged with and disengaged from the direction perpendicular to the axial direction of the pin engaging part and perpendicular to the center line direction of the pin part. Configured. Therefore, when replacing the clamp arm, with the pin part remaining on one of the attachment block and clamp arm, the pin part is disengaged from the pin engagement part, and the clamp arm is removed from the attachment block. In addition, the new clamp arm can be attached to the attachment block by engaging one pin portion of the attachment block and the new clamp arm with the other pin engaging portion.

  When the clamp arm is attached to the attachment block, the pin part engages with the pin engagement part, and the clamp arm can be integrated with the attachment block positioned, and the clamping force of the clamp rod can be connected via the pin part. Can be transmitted from the attachment block to the clamp arm. In other words, by positioning and fixing the attachment block at the desired position with respect to the clamp rod in advance, the clamp arm can be positioned at the desired position and attached to the clamp rod (attachment block), and the pin portion can be attached. The clamp arm can be attached to and detached from the attachment block by engaging and disengaging the pin part with the pin engagement part without attaching and detaching.As a result, the load of replacing the clamp arm can be greatly reduced. When performed frequently, the load for replacing the clamp arms can be significantly reduced, which is very convenient.

  According to the swing type clamp device of the eighth aspect, the attachment block and the clamp arm are provided with a pin hole formed in a penetrating manner in parallel with the center line direction of the pin portion, and a clamp force transmission pin inserted into the pin hole. It was. Therefore, with the clamp force transmission pin removed from the pin hole, the clamp arm can be attached to and detached from the attachment block. With the clamp arm attached to the attachment block, the clamp force transmission pin is attached to the pin hole, The clamp arm and the clamp arm can be reliably and integrally connected, and the clamp force of the clamp rod can be reliably transmitted from the attachment block to the clamp arm via the clamp force transmission pin and the pin portion.

  According to the swing type clamp device of the ninth aspect, the pin portion and the clamp force transmission pin are arranged on both sides of the clamp rod in the length direction of the clamp arm. Therefore, the clamp force of the clamp rod can be effectively transmitted from the attachment block to the clamp arm via the pin portion and the clamp force transmission pin.

  According to the swing type clamp device of the tenth aspect, one clamping force transmission pin member is mounted in one of the attachment block and the clamp arm, and the pin portion is configured by this clamping force transmission pin member. Accordingly, the pin portion can be easily provided on one of the attachment block and the clamp arm, which is advantageous in terms of manufacturing.

  According to the swing type clamping device of the eleventh aspect, the attachment block is formed in a rectangular block shape, the bifurcated portion is formed in the proximal end portion of the clamp arm, and the attachment block is formed in the portion including the bifurcated portion of the clamp arm. An accommodation recess having an open base end accommodated in a fitting shape was formed. Therefore, when replacing the clamp arm, securely engage and disengage the pin part with the pin engaging part, that is, attach / detach the clamp arm to / from the attachment block, and position the clamp arm to the attachment block securely. Can be installed.

  According to the swing type clamping device of the twelfth aspect, the pair of pin portions and the pin engaging portion are provided symmetrically in the width direction of the clamp arm, and the pair of pin portions are provided on the base of the clamp arm rather than the clamp force transmission pin. It is arranged on the end side and protrudes in a direction away from the attachment block, and a pair of pin engaging portions is formed from a pair of U-shaped grooves cut out from the proximal end portion at the bifurcated portion of the clamp arm. Become. Accordingly, the pair of pin engaging portions can be provided with a simple structure, and the pair of pin portions can be reliably engaged with and disengaged from the pair of pin engaging portions.

  According to the swing type clamp device of the thirteenth aspect, the pin portion is disposed on the proximal end side of the clamp arm with respect to the clamp force transmission pin, and is attached to the bifurcated portion of the clamp arm, and the pin engaging portion is an attachment. Since the block is formed of a U-shaped groove cut out from the proximal end portion, the same effect as that of the twelfth aspect can be obtained.

  According to the swing type clamp device of the fourteenth aspect, the contact surface capable of contacting the smooth surface parallel to the direction perpendicular to the axis of the pin engaging portion is formed on the outer peripheral portion of the pin portion. Therefore, the surface pressure that the pin portion receives from the pin engaging portion can be reduced, and damage to the pin portion and the pin engaging portion can be prevented.

It is a top view of the swing type clamp device of Example 1. It is the II-II sectional view taken on the line of FIG. It is a top view of an attachment block. It is the IV-IV sectional view taken on the line of FIG. It is a top view of a clamp arm. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. It is a front view of a clamp force transmission pin. It is a top view of the swing type clamp device of Example 2. It is the IX-IX sectional view taken on the line of FIG. It is a top view of an attachment block. It is a side view of an attachment block. It is a top view of a clamp arm. It is a side view of a clamp arm. It is a front view of a clamp force transmission pin. It is a longitudinal cross-sectional view of the swing type clamp apparatus which concerns on a modification. It is a longitudinal cross-sectional view of the swing type clamp apparatus which concerns on a modification. It is a perspective view of the swing type clamp device concerning a modification. It is a perspective view of the swing type clamp device concerning a modification. It is a perspective view of the swing type clamp apparatus of Example 3. It is a perspective view of a swing type clamp device (clamp arm non-attachment state). It is a top view of a swing type clamp device. It is AA sectional view taken on the line of FIG. It is a top view of an attachment block. FIG. 24 is a sectional view taken along line B-B in FIG. 23. It is a top view of a clamp arm. It is CC sectional view taken on the line of FIG. It is a top view of the swing type clamp device of Example 4. It is the DD sectional view taken on the line of FIG. It is a top view of an attachment block. It is the EE sectional view taken on the line of FIG. It is a top view of a clamp arm. It is the FF sectional view taken on the line of FIG.

Explanation of symbols

1, 11, 30, 40, 51, 61 Swing type clamp device 2, 12, 52, 62 Clamp body 3, 13, 53, 63 Clamp rods 3b, 53b, 63b Tapered shaft portions 4, 14, 31, 41, 54 , 64 Attachment block 4a, 54a, 64a Taper shaft hole 6, 16, 32, 42, 56, 66 Clamp arm 6c, 16c Rectangular hole 7, 17, 57, 67 Clamping force transmission pin 8, 18, 59, 69 Drive mechanism 14a Shaft hole 14b Slit (parting part)
15 Block fastening bolts 56d, 66d Bifurcated portions 56f, 66f Housing recesses 56i, 64c Pin engaging portion (U-shaped groove)
58, 68 Clamping force transmission pin members 58a, 68a Pin portions 58b, 68b Contact surface

  The swing-type clamp device of the present invention includes a clamp body, a clamp rod that is supported by the clamp body so as to be movable back and forth in the axial direction and rotatable about the axis, and a clamp that is attached to a tip portion of the clamp rod. The clamp rod is moved forward and backward so that it can be switched over between the arm and the clamp position where the clamp arm is moved to the axial retreat side with respect to the clamp release position and the clamp release position and swung around the axis. And drive means for rotationally driving.

  As shown in FIGS. 1 to 7, the swing type clamp device 1 includes a clamp body 2, a clamp rod 3, an attachment block 4, a block fixing nut 5, a clamp arm 6, a pair of clamp force transmission pins 7, and a drive mechanism 8. It has. The description will be made assuming that the direction of the arrow a in FIG. 1 is the front and the direction of the arrow b in FIG.

  As shown in FIGS. 1 and 2, the clamp body 2 is formed in a cylinder shape, and the clamp body 2 is attached to a fixing plate or the like for fixing a clamp object. The clamp rod 3 is supported by the clamp body 2 so as to be able to advance and retreat in the axial direction (vertical direction) and to rotate around the axial center so as to be inserted and projecting upward. A threaded portion 3a is formed at the distal end portion (upper end portion) of the clamp rod 3, and the distal end portion excluding the threaded portion 3a of the clamp rod 3 is formed at a tapered shaft portion 3b whose diameter decreases toward the distal end side.

  As shown in FIGS. 1-4, the attachment block 4 is formed in the rectangular block shape. Specifically, the attachment block 4 is formed in a rectangular shape that is smaller than the clamp body 2 and slightly longer in the front-rear direction than the left-right length in plan view, and is substantially the same as the vertical length of the taper shaft portion 3b of the clamp rod 3. It has a directional thickness.

  A taper shaft hole 4a into which the taper shaft portion 3b of the clamp rod 3 is fitted is formed in the center portion of the attachment block 4 so as to penetrate vertically. In a state where the taper shaft portion 3b is fitted in the taper shaft hole 4a, the screw portion 3a of the clamp rod 3 protrudes to the upper side of the attachment block 4. A pair of pin holes 4b that are long in the left-right direction (a direction parallel to the axis center direction) are formed in the left and right end portions of the attachment block 4 in the left-right direction.

  As shown in FIGS. 1 and 2, the block fixing nut 5 is screwed into the threaded portion 3 a of the clamp rod 3 from the upper side and abuts on the upper surface of the outer peripheral portion of the tapered shaft hole 4 a of the attachment block 4. With this block fixing nut 5, the attachment block 4 is pressed downward, and the inner peripheral surface of the tapered shaft hole 4 a of the attachment block 4 is fixed in close contact with the tapered shaft portion 3 b of the clamp rod 3.

  As shown in FIGS. 1, 2, 5, and 6, the clamp arm 6 includes a connecting portion 6 a at a base end portion thereof, and an arm portion 6 b extending integrally from the connecting portion 6 a, and the connecting portion 6 a Is attached to the attachment block 4 so as to be detachable from above. The connecting portion 6a is formed in a rectangular shape larger than the attachment block 4 in plan view, and has a vertical thickness substantially the same as the vertical length of the threaded portion 3a and the tapered shaft portion 3b of the clamp rod 3.

  A rectangular hole 6c having an open lower end in which the attachment block 4 is fitted from the lower side and a block fixing nut 5 are fitted from the lower side at the central part of the connecting part 6a. A circular hole 6d having an open upper end is formed. Two sets of pin holes 6e that are long in the left-right direction are formed at both front and rear end portions of the connecting portion 6a, and each set of pin holes 6e is formed in a left-right penetrating manner on the left and right side walls facing the rectangular hole 6c of the connecting portion 6a. ing. The pin hole 6 e is formed with the same diameter as the pin hole 4 b of the attachment block 4.

  A step portion 6f having a lower surface facing the rectangular hole 6c is formed on the outer peripheral portion of the circular hole 6d of the connecting portion 6a. When the attachment block 4 is fitted in the rectangular hole 6c and the stepped portion 6f is placed and supported on the attachment block 4, the clamp arm 6 is positioned on the attachment block 4 in the axial direction and around the axis, and is attached. The holes 4b and 6e communicate with each other. In addition, the rectangular hole 6c and the step part 6f correspond to a positioning part.

  As shown in FIGS. 1, 2, and 7, each of the pair of clamping force transmission pins 7 has substantially the same diameter as the pin holes 4b and 6e, and a head portion 7a is formed at the proximal end portion, and the distal end portion. An annular groove 7b is formed on the surface. In a state where the clamp arm 6 is mounted on the attachment block 4, the pair of clamp force transmission pins 7 are inserted into the pin holes 4b and 6e from a direction parallel to the direction perpendicular to the axial center, and project outside the pin hole 6e. A retaining ring 7c (O-ring) is attached to the annular groove 7b of each clamping force transmission pin 7 to prevent it from coming off. These clamp force transmission pins 7 are integrally connected to the attachment block 4 in a state where the clamp arm 6 is positioned.

  The drive mechanism 8 can be switched over between a clamp release position and a clamp position in which the clamp arm 6 is moved to the axial retreat side (lower side) with respect to the clamp release position and swung around the axial center. The clamp rod 3 is driven to move forward and backward and is rotationally driven, and is provided in the cylinder body 2. The drive mechanism 8 includes, for example, a return-acting hydraulic cylinder that can drive the clamp rod 3 in both the vertical directions, or a single-acting hydraulic cylinder that drives the clamp rod 3 downward or upward, and the clamp rod 3. And a spring member that biases upward or downward.

  Here, the clamp rod 3 driven in the vertical direction by the drive mechanism 8 is moved in the vertical direction in order to realize a predetermined clamp operation and a clamp release operation (switching between the clamp release position and the clamp release position of the clamp arm 6). And a guide mechanism (not shown) for guiding in the rotation direction.

  When clamping the clamp object, when the clamp rod 3 is driven to retract from the state where the clamp arm 6 is located at the clamp release position, the clamp force generated by the drive force is a pair of clamp force transmission pins. 7 is transmitted to the clamp arm 6, and the clamp object 6 is pressed by the clamp arm 6. Although detailed description of the drive mechanism 8 and the guide mechanism is omitted, for example, those disclosed in Japanese Patent Application Laid-Open Nos. 2004-268187 and 2005-28535 can be employed.

The operation and effect of the swing type clamp device 1 described above will be described.
When exchanging the clamp arm 6, the connection between the attachment block 4 and the clamp arm 6 is first released by pulling out the pair of clamping force transmission pins 7 from the pin holes 4 b and 6 e of the attachment block 4 and the clamp arm 6. Next, the clamp arm 6 is removed from the attachment block 4.

  Next, a new clamp arm 6 is attached to the attachment block 4. Then, the clamp arm 6 is positioned in the attachment block 4, and the pin hole 4 b of the attachment block 4 and the pin hole 6 e of the clamp arm 6 communicate with each other. Next, a pair of clamping force transmission pins 7 are inserted into these pin holes 4b and 6e from the direction orthogonal to the axial center direction, and are integrally connected to the attachment block 4 with the clamp arm 6 positioned.

  In this way, the attachment block 4 is positioned and fixed in advance with respect to the clamp rod 3, so that the clamp arm 6 can be easily placed in the predetermined position with respect to the clamp rod 3 (attachment block 4). These clamp force transmission pins 7 can be positioned and mounted securely, and can be easily mounted without fastening the clamp arm 6 to the attachment block 4, and as a result, the load of the replacement work of the clamp arm 3 can be reliably reduced. In particular, when the clamp arm 6 is frequently replaced, the load of the replacement work of the clamp arm 6 can be remarkably reduced, which is very convenient.

  The attachment block 4 was provided with a rectangular hole 6c and a stepped portion 6f as positioning portions for positioning the clamp arm 6 in the axial direction and around the axial center. Therefore, by attaching the clamp arm 6 to the attachment block 4, it can be easily and reliably positioned at a connectable position. In this state, the pair of clamp force transmission pins 7 are connected to the attachment block 4 and the pin holes 4 b of the clamp arm 6. 6e can be easily inserted, and as a result, the replacement work of the clamp arm 6 can be performed more easily and reliably.

  The attachment block 4 was formed in a rectangular block shape, and a rectangular hole 6 c into which the attachment block 4 was fitted was formed in the clamp arm 6. That is, since the clamp arm 6 can be externally attached to the attachment block 4, the pair of clamp force transmission pins 7 are securely inserted into the attachment block 4 and the clamp arm 6 from the direction orthogonal to the axial center direction. The force transmission pin 7 can be reliably and integrally connected to the attachment block 4 with the clamp arm 6 positioned. In addition, the clamp arm 6 can be reliably positioned around the axis of the attachment block 4 with a simple structure.

  A tapered shaft portion 3b having a smaller diameter toward the distal end side is formed at the distal end portion of the clamp rod 3, and a tapered shaft hole 4a into which the tapered shaft portion 3b is fitted is formed in the attachment block 4. Therefore, the attachment block 4 can be securely fixed to the tip of the clamp rod 3 in a close contact state by pressing the attachment block 4 toward the axially retracted side by the block fixing nut 5.

  As shown in FIGS. 8 to 14, the swing type clamp device 11 includes a clamp body 12, a clamp rod 13, an attachment block 14, a block fastening bolt 15, a clamp arm 16, a pair of clamp force transmission pins 17, and a drive mechanism 18. It has. In the following description, the direction of the arrow a in FIG. 8 is the front, and the direction of the arrow b in FIG. 9 is the upper.

  As shown in FIGS. 8 and 9, the clamp body 12 and the drive mechanism 18 have the same functions as the clamp body 2 and the drive mechanism 8 of the first embodiment. The swing type clamp device 11 has the same guide mechanism as that of the first embodiment. Therefore, the detailed description regarding the clamp body 12, the drive mechanism 18, and the guide mechanism is omitted. The clamp rod 13 is supported by the clamp body 12 in an insertion shape and an upward projecting shape so as to be able to advance and retreat in the axial direction and to rotate around the axial center. The clamp rod 13 is formed in a straight shape as a whole, and an annular groove 13 a is formed at the tip portion of the clamp rod 13.

  As shown in FIGS. 8 to 11, the attachment block 14 is formed in a rectangular block shape. Specifically, the attachment block 14 is formed in a rectangular shape that is smaller than the clamp body 12 and slightly longer in the front-rear direction than in the left-right direction in plan view, and is about three times the vertical width of the annular groove 13a of the clamp rod 13. The thickness in the vertical direction is as follows.

  The attachment block 14 is formed with a shaft hole 14a into which a tip end portion of the clamp rod 13 is fitted in a slightly front part of the center part in a vertically penetrating manner, and the shaft hole 14a and the rear end side of the attachment block 14 A slit 14b, which is a divided portion that is continuous with, is formed in the front-rear direction. By this slit 14b, the entire rear side portion of the shaft hole 14a of the attachment block 14 is divided into right and left to form a divided portion 14c.

  Bolt holes 14d that are long in the left-right direction are formed in the left-right direction so as to be slightly rearward of the center portion of the attachment block 14. The bolt hole 14d is formed so as to pass through the front portion of the slit 14b and to wrap a part of the central portion in the length direction with the shaft hole 14a. A large diameter hole 14d1 is formed at the right end of the bolt hole 14d, and a screw hole 14d2 is formed at the left end.

  In the front end portion of the attachment block 14, a pin hole 14e that is long in the left-right direction is formed in a left-right direction. At the rear end portion of the attachment block 14 (divided portion 14c), a notch portion 14f that is notched from the rear end to the front side and has the same vertical width as the diameter of the pin hole 14e is formed in a laterally penetrating manner.

  As shown in FIGS. 8 and 9, the block fastening bolt 15 has substantially the same diameter as the bolt hole 14d, a head portion 15a is formed at the base end portion, and a screw shaft portion 15b is formed at the tip end portion. With the distal end portion of the clamp rod 13 fitted in the shaft hole 14a of the attachment block 14, the block fastening bolt 15 is inserted into the bolt hole 14d with the annular groove 13a and the bolt hole 14d aligned vertically, and the annular groove 13a, a part of the head 15a is fitted into the large-diameter hole 14d1, and the screw shaft portion 15b is screwed into the screw hole 14d2. In this state, the front end surface of the clamp rod 13 and the upper end surface of the attachment block 14 are at substantially the same vertical position.

  When the block fastening bolt 15 is engaged with the annular groove 13a, the attachment block 14 is vertically positioned with respect to the clamp rod 13, and the left and right divided portions 14c are fastened by the block fastening bolt 15 through the slit 14b. Then, the attachment block 14 is elastically deformed so that the divided portions 14c approach each other, and the inner peripheral surface of the shaft hole 14a of the attachment block 14 is fixed in close contact with the distal end portion of the clamp rod 13.

  As shown in FIGS. 8, 9, 12 and 13, the clamp arm 16 has a connecting portion 16a at the base end portion thereof and an arm portion 16b extending integrally from the connecting portion 16a. Is attached to the attachment block 14 so as to be detachable from above. The connecting portion 16 a is formed in a rectangular shape larger than the attachment block 14 in a plan view, and has the same vertical thickness as the attachment block 14.

  In the center portion of the connecting portion 16a, a vertically penetrating rectangular hole 16c into which the attachment block 14 is fitted from below is formed. On the left side wall facing the rectangular hole 16c of the connecting portion 16a, a notch portion 16d that is notched upward from the lower end and has the same front-rear width as the diameter of the head portion 15a of the block fastening bolt 15 is formed in a left-right penetrating manner. Yes. Two sets of pin holes 16e that are long in the left-right direction are formed at the front and rear end portions of the connecting portion 16a, and each set of pin holes 16e is formed in a left-right penetrating manner on the left and right side walls facing the rectangular hole 16c of the connecting portion 16a. ing. The pin hole 16e is formed to have the same diameter as the pin hole 14e of the attachment block 14.

  When the attachment block 14 is fitted in the rectangular hole 16c and the notch 16d is engaged and supported by the head 15a of the block fastening bolt 15, the clamp arm 16 is axially and axially mounted on the attachment block 14. And the pin holes 14e and 16e and the notch pin hole 14f communicate with each other. The rectangular hole 16c and the head 15a of the block fastening bolt 15 correspond to the positioning portion.

  As shown in FIGS. 8, 9, and 14, each of the pair of clamping force transmission pins 17 has substantially the same diameter as the pin hole 14e and the pin hole 16e, and a head portion 17a is formed at the base end portion. An annular groove 17b is formed at the tip. In a state where the clamp arm 16 is mounted on the attachment block 14, the pair of clamp force transmission pins 17 are inserted into the pin holes 14e and 16e and the notch portion 14f from the direction orthogonal to the axial center direction, and the outside thereof. A retaining ring 17c is attached to the annular groove 17b of each clamping force transmission pin 17 protruding in the manner to prevent it from coming off. The clamp force transmission pins 17 are integrally connected to the attachment block 14 in a state where the clamp arm 16 is positioned.

  According to the swing type clamp device 11 described above, the attachment block 14 is formed with the shaft hole 14a in which the tip portion of the clamp rod 13 is fitted, and the slit 14b connected to the shaft hole 14a, and is divided through the slit 14b. A block fastening bolt 15 is provided that fastens the portion 14c and elastically deforms the attachment block 14 to fix the attachment block 14 to the tip portion of the clamp rod 13. Therefore, the attachment block 14 can be securely fixed to the tip portion of the clamp rod 13 in a close contact state.

  Further, a notch portion 14f through which the clamping force transmission pin 17 is inserted is formed at the rear end portion of the attachment block 14 (divided portion 14c). Therefore, even when the divided portion 14c is fastened and elastically deformed by the block fastening bolt 15, the clamp force transmitting pin 17 can be smoothly inserted into the notch portion 14f, and the clamp arm 16 can be connected to the attachment block 14. It can be done reliably. The other effects are basically the same as those of the first embodiment.

Next, a modified example of the first and second embodiments will be described.
1] As a modification of the first embodiment, as shown in FIG. 15, the taper shaft hole 4a of the attachment block 14 is changed to a straight shaft hole 4a1, and the taper of the clamp rod 3 is fitted in the shaft hole 4a1. A taper ring 20 having a taper shaft hole 20a in which the shaft portion 3b is fitted may be provided in the attachment block 4.

2] As a modification of the first embodiment, as shown in FIG. 16, a tapered ring 21 having a tapered outer peripheral surface 21 a fitted into the tapered shaft hole 4 a of the attachment block 14 may be provided. The taper ring 21 is formed with a straight shaft hole 21b, and the tip end portion of the straight clamp rod 3 is fitted into the shaft hole 21b.

3] As in the swing type clamp device 30 of FIG. 17, the attachment block 31 may be formed in a circular block shape, and a circular hole 32 a into which the attachment block 31 is fitted may be formed in the clamp arm 32.
4] Like the swing type clamp device 40 of FIG. 18, the attachment block 41 is formed in a rectangular block shape, and is formed in a bifurcated shape having a pair of connecting block pieces 42a at the base end portion of the clamp arm 42. Good. The attachment block 41 is fitted between the pair of connection block pieces 42 a, and the clamp arm 41 is connected to the attachment block 41.

5] In the device having the positioning portion as in the above embodiment, if possible, the clamp arm may be integrally connected to the attachment block with one clamp force transmission pin. Further, the clamp arm may be integrally connected to the attachment block with three or more clamp force transmission pins.

  As shown in FIGS. 19 to 26, the swing type clamp device 51 includes a clamp body 52, a clamp rod 53, an attachment block 54, a block fixing nut 55, a clamp arm 56, a clamp force transmission pin 57, and a clamp force transmission pin member 58. A drive mechanism 59 is provided. In the following description, the direction of arrow a in FIG.

  As shown in FIGS. 19 to 22, the clamp body 52, the clamp rod 53, the block fixing nut 55, and the drive mechanism 59 are the same as the clamp body 2, the clamp rod 3, the block fixing nut 5, and the drive mechanism 8 of the first embodiment. It has a function. The swing type clamp device 11 has the same guide mechanism as that of the first embodiment. Therefore, the detailed description regarding the clamp main body 52, the clamp rod 53, the block fixing nut 55, the drive mechanism 59, etc. is abbreviate | omitted.

  As shown in FIGS. 19 to 24, the attachment block 54 is formed in a rectangular block shape. Specifically, the attachment block 54 is formed in a rectangular shape that is smaller than the clamp main body 52 and slightly longer in the front-rear direction than the left-right length in plan view, and is substantially the same as the vertical length of the tapered shaft portion 53 b of the clamp rod 53. It has a directional thickness.

  A taper shaft hole 54 a into which the taper shaft portion 53 b of the clamp rod 53 is fitted is formed in the center portion of the attachment block 54 so as to penetrate vertically. In a state where the taper shaft portion 53b is fitted in the taper shaft hole 54a, the screw portion 53a at the upper end portion of the clamp rod 53 projects to the upper side of the attachment block 54, and the block fixing nut 55 is attached to the screw portion 53a. The attachment block 54 is fixed to the clamp rod 53 by this block fixing nut 55.

  A pair of pin holes 54b, 54c that are long in the left-right direction are formed in the left-right direction at both front and rear end portions of the attachment block 54. A clamp force transmission pin 57 is detachably inserted into the front pin hole 54b, and a clamp force transmission pin member 58 is fixedly inserted (for example, press-fitted) into the rear pin hole 54c and attached to the attachment block 54. Has been. The clamp force transmission pin member 58 constitutes a pair of left and right pin portions 58a for transmitting the clamp force, and the pair of pin portions 58a protrudes from the attachment block 54 in the direction away from each other (both left and right directions), and the attachment block 54 A pair of upper and lower smooth contact surfaces 58b are formed on the outer peripheral portion of each pin portion 58a that protrudes from the upper portion.

  That is, the pair of pin portions 58a are provided symmetrically in the width direction (left-right direction) of the clamp arm 56 toward the attachment block 54 in the direction parallel to the axis orthogonal direction (left-right direction). The clamp force transmission pin 57 and the clamp force transmission pin member 58 (a pair of pin portions 58a) are arranged in the length direction (front-rear direction) of the clamp arm 56. Are disposed on both sides of the clamp rod 53.

  As shown in FIGS. 19 to 22, 25, and 26, the clamp arm 56 includes a connecting portion 56 a at a base end portion thereof and an arm portion 56 b that integrally extends from the connecting portion 56 a, and the connecting portion 56 a. Is attached to the attachment block 54 so as to be detachable. The connecting portion 56a is larger than the attachment block 54 in plan view, and has substantially the same vertical thickness as the vertical length of the threaded portion 53a and the tapered shaft portion 53b of the clamp rod 53.

  The connecting portion 56a includes a vertical wall portion 56c located at the front end thereof, a bifurcated portion 56d (a pair of left and right side wall portions 56d) extending rearward from the vertical wall portion 56c, a vertical wall portion 56c and a bifurcated portion 56d. An upper wall portion 56e connected to the upper end is formed, and the vertical wall portion 56c, the bifurcated portion 56d, and the upper wall portion 56e form a lower end of the attachment block 54 that is accommodated in an inner fitting shape, and an open recessed recessed portion 56f. Has been. The upper wall portion 56e is formed with an opening 56g having an upper end and an open rear end that are connected to the housing recess 56f and into which the block fixing nut 55 is fitted.

  In the connecting portion 56a, a pair of pin holes 56h are formed in the front end portion of the bifurcated portion 56d so as to penetrate left and right, and the pin holes 56h are formed to have the same diameter as the pin holes 54b of the attachment block 54. A pair of pin engaging portions 56i with which a pair of pin portions 58a engage so that the both ends 54, 56 can be integrally connected to the rear end portion of the portion 56d with the clamp arm 56 attached to the attachment block 54. Is provided.

  The pair of pin engaging portions 56i are provided symmetrically in the width direction (left-right direction) of the clamp arm 56, and are a pair of U-shaped notches from the proximal end (rear end) to the bifurcated portion 56d. The upper and lower widths of the U-shaped groove 56i are formed to have the same width as the minimum diameter of the portion where the contact surface 58b of the pin portion 58a is formed, and the rear end portion of the bifurcated portion 56d A tapered portion 56j that is continuous with the rear end of the U-shaped groove 56i and whose vertical width increases toward the rear side is formed.

  The attachment block 54 is housed in the housing recess 56f so that the bifurcated portion 56d and the upper wall portion 56e (vertical wall portion 56c) are in contact with the attachment block 54, and the pair of pin portions 58a of the attachment block 54 are bifurcated portions. The pair of pin engaging portions 56i at the rear end portion of 56d are engaged, the clamp arm 56 is positioned on the attachment block 54, and the pin holes 54b and 56h communicate with each other.

  As shown in FIGS. 19 to 22, the clamp force transmission pin 57 has substantially the same diameter as the pin holes 54b and 56h, a head portion 57a is formed at the proximal end portion, and an annular groove 57b is formed at the distal end portion. Yes. With the clamp arm 56 mounted on the attachment block 54, the clamp force transmission pin 57 is inserted into the pin holes 54b and 56h, and the retaining ring is inserted into the annular groove 57b of the clamp force transmission pin 57 protruding outside the pin hole 56h. 57c is attached to prevent it from coming off. The clamp force transmission pin 57 and the pair of pin portions 58a are integrally connected to the attachment block 54 in a state where the clamp arm 56 is positioned and mounted.

The operation and effect of the swing type clamp device 51 described above will be described.
As shown in FIG. 20, when the clamp arm 56 is replaced, first, the clamp force transmission pin 57 is pulled out from the attachment block 54 and the pin holes 54b and 56h of the clamp arm 56, so that the attachment block 54, the clamp arm 56, and Next, the clamp arm 56 is moved forward, so that the pair of pin portions 58a are disengaged from the pair of pin engaging portions 56i, removed from the attachment block 54, and then Then, a new clamp arm 56 is attached to the attachment block 54.

  When the new clamp arm 56 is mounted, the clamp arm 56 is placed in a horizontal posture, and the clamp arm 56 is moved from the front side to the rear side of the attachment block 54, so that the attachment block 54 is accommodated in the accommodation recess 56f. The pair of pin portions 58a is engaged with the pair of pin engaging portions 56i. At this time, even if the height position of the clamp arm 56 with respect to the attachment block 54 is slightly deviated, the taper portion 56j is guided by the pin portion 58a, and the pair of pin portions 58a is reliably connected to the pair of pin engaging portions 56i. Engage with.

  Thus, the clamp arm 56 is attached to the attachment block 54, the pin hole 54b of the attachment block 54 and the pin hole 56h of the clamp arm 56 communicate with each other, and then the clamping force transmission pin 57 is inserted into the pin holes 54b and 56h. Then, the clamp arm 56 is integrally connected to the attachment block 54 while being positioned.

  Thus, when attaching / detaching the clamp arm 56 to / from the attachment block 54, the pair of pin portions 58a is perpendicular to the axial direction of the pair of pin engaging portions 56i and the direction of the center line of the pair of pin portions 58a When the clamp arm 56 is attached to the attachment block 54, the pair of pin portions 58a are engaged with the pair of pin engagement portions 56i, and the clamp arm 56 is attached to the attachment block 54. The clamp force of the clamp rod 53 can be transmitted to the clamp arm 56 from the attachment block 54 via the pair of pin portions 58a.

  That is, the attachment block 54 is positioned and fixed in advance with respect to the clamp rod 53, so that the clamp arm 56 is positioned and attached to the clamp rod 53 (attachment block 54). The clamp arm 56 can be attached to and detached from the attachment block 54 by detaching the pair of pin portions 58a from the pair of pin engaging portions 56i without attaching and detaching the pair of pin portions 58a. The load of the replacement work of the arm 56 can be greatly reduced. In particular, when the replacement of the clamp arm 56 is frequently performed, the load of the replacement work of the clamp arm 56 can be further remarkably reduced, which is very convenient. .

  The attachment block 54 and the clamp arm 56 are provided with pin holes 54b and 56h formed in a penetrating manner in parallel with the center line direction of the pin portion 58a, and a clamp force transmission pin 57 inserted through the pin holes 54b and 56h. . Accordingly, the clamp arm 56 can be attached to and detached from the attachment block 54 with the clamp force transmission pin 57 removed from the pin holes 54b and 56h, and the clamp arm 56 is attached to the attachment block 54 and clamped into the pin holes 54b and 56h. By attaching the force transmission pin 57, the attachment block 54 and the clamp arm 56 can be securely and integrally connected, and the clamping force of the clamp rod 53 is attached to the attachment block via the clamp force transmission pin 57 and a pair of pin portions 58a. 54 can be reliably transmitted to the clamp arm 56.

  The pair of pin portions 58 a and the clamp force transmission pin 57 are arranged on both sides of the clamp rod 53 in the length direction of the clamp arm 56. Therefore, the clamping force of the clamp rod 53 can be effectively transmitted to the clamp arm 56 via the pair of pin portions 58 a and the clamp force transmission pin 57. A single clamping force transmission pin member 58 was attached to the attachment block 54 in a penetrating manner, and a pair of pin portions 58a was constituted by the clamping force transmission pin member 58. Therefore, a pair of pin portions 58a can be easily provided on the attachment block 54, and can be shared by a plurality of replaceable clamp arms 56, which is very advantageous in terms of manufacturing.

  The attachment block 54 is formed in a rectangular block shape, a bifurcated portion 56d is formed in the proximal end portion of the clamp arm 56, and the attachment block 54 is accommodated in an inner fitting shape at a portion including the bifurcated portion 56d of the clamp arm 56. An accommodation recess 56f having an open base end was formed. Therefore, when replacing the clamp arm 56, the clamp arm 56 is moved back and forth to engage and disengage the pair of pin portions 58a with the pair of pin engaging portions 56i, that is, the attachment block 54 of the clamp arm 56. The clamp arm 56 can be reliably positioned and attached to the attachment block 54.

  A pair of pin portions 58a and a pin engaging portion 56i are provided symmetrically in the width direction of the clamp arm 56, and the pair of pin portions 58a are arranged on the proximal end side of the clamp arm 56 with respect to the clamp force transmission pin 57. The pair of pin engaging portions 56i are projected from the attachment block 54 in a direction away from each other, and the pair of pin engaging portions 56i are formed of a pair of U-shaped grooves 56i cut out from the proximal end on the bifurcated portion 56d of the clamp arm 56. . Therefore, the pair of pin engaging portions 56i can be provided with a simple structure, and the pair of pin portions 58a can be reliably engaged with and disengaged from the pair of pin engaging portions 56i.

  A contact surface 58b that can contact a smooth surface parallel to the direction perpendicular to the axis of the pin engaging portion 56i is formed on the outer periphery of the pin portion 58a. Accordingly, the surface pressure received by the pin portion 58a from the pin engaging portion 56i can be reduced, and damage to the pin portion 58a and the pin engaging portion 56i can be prevented.

  As shown in FIGS. 27 to 30, the swing type clamp device 61 includes a clamp body 62, a clamp rod 63, an attachment block 64, a block fixing nut 65, a clamp arm 66, a clamp force transmission pin 67, and a clamp force transmission pin member 68. A drive mechanism 69 is provided. In the following description, the direction of arrow a in FIG. 27 is assumed to be the front, and the direction of arrow b in FIG.

  As shown in FIGS. 27 and 28, the clamp body 62, the clamp rod 63, the block fixing nut 65, and the drive mechanism 69 are the same as the clamp body 2, the clamp rod 3, the block fixing nut 5, and the drive mechanism 8 of the first embodiment. It has a function. The swing type clamp device 11 has the same guide mechanism as that of the first embodiment. Therefore, detailed descriptions of the clamp body 62, the clamp rod 63, the block fixing nut 65, the drive mechanism 69, and the like are omitted.

  As shown in FIGS. 27 to 30, the attachment block 64 is formed in a rectangular block shape. Specifically, the attachment block 64 is formed in a rectangular shape that is smaller than the clamp body 62 and slightly longer in the front-rear direction than in the left-right direction in plan view, and is substantially the same as the vertical length of the taper shaft portion 63b of the clamp rod 63. It has a directional thickness.

  In the center portion of the attachment block 64, a tapered shaft hole 64a into which the tapered shaft portion 63b of the clamp rod 63 is fitted is formed in a vertically penetrating manner. In a state where the taper shaft portion 63b is fitted in the taper shaft hole 64a, the screw portion 63a at the upper end portion of the clamp rod 63 protrudes to the upper side of the attachment block 64, and the block fixing nut 65 is attached to the screw portion 63a. The attachment block 64 is fixed to the clamp rod 63 by this block fixing nut 65.

  A pin hole 64b that is long in the left-right direction is formed in the front end portion of the attachment block 64 so as to penetrate in the left-right direction, and a pin engagement made of a U-shaped groove 64c cut out from the rear end portion is formed in the rear end portion of the attachment block 64. The joint portion 64c is formed over the entire left and right width. A clamp force transmission pin 67 is removably inserted into the pin hole 54b in the pin hole 64b, and a clamp force transmission pin member 68 (pin portion 68a) is detachably connected to the pin engagement portion 64c in the pin engagement portion 64c. Engaged. An inclined portion 64 d is formed at the upper front end portion of the attachment block 64, and a curved portion 64 e is formed at the upper rear end portion of the attachment block 64.

  As shown in FIGS. 27, 28, 31, and 32, the clamp arm 66 has a connecting portion 66a at the base end portion thereof and an arm portion 66b that extends integrally from the connecting portion 66a, and the connecting portion 66a. Is attached to the attachment block 64 so as to be detachable. The connecting portion 66a is larger than the attachment block 64 in plan view, and has a vertical thickness substantially the same as the vertical length of the threaded portion 63a and the tapered shaft portion 63b of the clamp rod 63.

  The connecting portion 66a includes a vertical wall portion 66c positioned at the front end thereof, a bifurcated portion 66d (a pair of left and right side wall portions 66d) extending rearward from the vertical wall portion 66c, and a vertical wall portion 66c and a bifurcated portion 66d. An upper wall portion 66e connected to the upper end is formed, and the vertical wall portion 66c, the bifurcated portion 66d, and the upper wall portion 66e form a lower end of the attachment block 64 that is accommodated in an inner fitting shape, and an accommodation recess 66f that is open at the rear end. Has been. The upper wall portion 66e is formed with an opening 66g having an open upper end formed of an elliptical hole that is connected to the housing recess 66f and into which the block fixing nut 65 is fitted.

  In the connecting portion 66a, a pair of pin holes 66h are formed in the front end portion of the bifurcated portion 66d so as to penetrate left and right, and the pin holes 66h are formed to have the same diameter as the pin hole 64b of the attachment block 64. In the portion 66a, a pair of pin holes 66i are formed in the rear end portion of the bifurcated portion 66d so as to penetrate left and right, and a clamping force transmission pin member 68 is fitted in this pin hole 66h.

  The clamping force transmission pin member 68 is rotatably mounted in a state of being prevented from coming off by the bifurcated portion 66d by a retaining ring 68e attached to the head portion 68c and the annular groove 68d at the tip portion. The pin member 68 constitutes a clamping force transmission pin portion 68a that can be engaged with and disengaged from the pin engaging portion 64c. A pair of smooth contact surfaces 68b facing in opposite directions are formed between the bifurcated portions 66d on the outer peripheral portion of the pin portion 68a, and the portion of the pin portion 68a where the contact surface 68b is formed is formed. The minimum diameter is the same as the vertical width of the U-shaped groove 64c.

  As described above, the pin portion 68 a is provided on the clamp arm 66 in a direction parallel to the axis orthogonal direction (left-right direction), and closer to the base end side (rear side) of the clamp arm 66 than the clamp force transmission pin 67. The clamp force transmission pin 67 and the clamp force transmission pin member 68 (pin portion 68a) are disposed on both sides of the clamp rod 63 in the length direction (front-rear direction) of the clamp arm 66.

  The attachment block 64 is housed in the housing recess 66f so that the bifurcated portion 66d and the upper wall portion 66e are in contact with the attachment block 64, and the pin portion 68a of the clamp arm 66 is pin-engaged at the rear end portion of the connecting portion 64e. The clamp arm 66 is engaged with the portion 64c and positioned in the attachment block 64 to be in the mounted state, and the pin holes 64b and 66h communicate with each other.

  As shown in FIGS. 27 and 28, the clamping force transmission pin 67 has substantially the same diameter as the pin holes 64b and 66h, a head portion 67a is formed at the proximal end portion, and an annular groove 67b is formed at the distal end portion. Yes. In a state where the clamp arm 66 is mounted on the attachment block 64, the clamp force transmission pin 67 is inserted into the pin holes 64b and 66h, and a retaining ring is inserted into the annular groove 67b of the clamp force transmission pin 67 protruding outside the pin hole 66h. 67c is attached and prevented from coming off. The clamp force transmission pin 67 and the pin portion 68a are integrally connected to the attachment block 64 in a state where the clamp arm 66 is positioned and mounted.

The operation and effect of the swing type clamp device 61 described above will be described.
As shown in FIG. 28, when exchanging the clamp arm 66, first, the clamp force transmission pin 67 is pulled out from the attachment block 64 and the pin holes 64b and 66h of the clamp arm 66, so that the attachment block 64, the clamp arm 66, Next, the clamp arm 66 is rotated upward about the pin portion 68a.

  Here, in order to make the clamp arm 66 rotatable about the pin portion 68a, the clamp force transmission pin member 68 is rotatably attached to the clamp arm 66, and the attachment block 64 and the clamp arm 66 are connected to each other. In order to prevent mutual interference, an inclined portion 64d is formed at the upper front end portion of the attachment block 64, a curved portion 64e is formed at the upper rear end portion of the attachment block 64, and a vertical wall portion 66c of the clamp arm 66 is formed. The inner surface is formed in a partial cylindrical surface 66ca having the pin portion 68a as a center line.

  After the clamp arm 66 is rotated upward until the lower end portion of the vertical wall portion 66c is positioned above the attachment block 64, the clamp arm 66 is moved rearward, and the pin portion 68a is moved from the pin engaging portion 64c. The engagement is released and removed from the attachment block 64, and then a new clamp arm 66 is attached to the attachment block 64.

  When the new clamp arm 66 is mounted, the clamp arm 66 is moved forward in substantially the same posture as the removed clamp arm 66, whereby the pin portion 68a is engaged with the pin engagement portion 64c. The arm 66 is rotated downward about the pin portion 68a, and the attachment block 64 is accommodated in the accommodating recess 66f. Then, the clamp arm 66 is attached to the attachment block 64, the pin hole 64b of the attachment block 64 and the pin hole 66h of the clamp arm 66 are communicated, and then the clamp force transmission pin 67 is inserted into the pin holes 64b and 66h. Then, the clamp arm 66 is integrally connected to the attachment block 64 while being positioned.

  According to the swing type clamp device 61, when the clamp arm 66 is attached to and detached from the attachment block 64, the pin portion 68a is perpendicular to the axial direction of the pin engaging portion 64c and perpendicular to the center line direction of the pin portion 68a. When the clamp arm 66 is attached to the attachment block 64 and is disengaged from the direction, the pin portion 68a engages with the pin engagement portion 64c, and the clamp arm 66 is positioned on the attachment block 64 and integrally connected. The clamping force of the clamp rod 63 can be transmitted from the attachment block 64 to the clamp arm 66 through the pin portion 68a.

  The pin portion 68a is disposed closer to the proximal end side of the clamp arm 66 than the clamp force transmission pin 67 and is attached to the bifurcated portion 66d of the clamp arm 66, and the pin engaging portion 64c is proximal to the attachment block 64. Since the U-shaped groove 64c cut out from the end portion is provided, the pin engaging portion 64c can be provided with a simple structure, and the pin portion 68a can be reliably engaged with and disengaged from the pin engaging portion 64c. In addition, the same effects as the swing clamp device 51 of the third embodiment are obtained.

Next, modified examples of the third and fourth embodiments will be described.
1] As a modification of the third embodiment, the clamping force transmission pin member 58 may be omitted, and a pair of separate pin portions 58a may be provided integrally with the attachment block 54.
2] As a modification of the fourth embodiment, the clamp force transmission pin member 68 may be omitted, and the clamp arm 66 may be provided with a pair of pin portions that protrude from the bifurcated portion 66d to the opposite sides. In this case, the engaging portion 64c formed of the U-shaped groove 64c provided in the attachment block 64 may be provided in a pair of left and right so that at least the pin portion can be engaged.

3] As a modification of the fourth embodiment, a taper portion that is continuous with the rear end of the U-shaped groove 64c and whose vertical width increases toward the rear side may be formed at the rear end portion of the attachment block 64.
4] As a modification of the third and fourth embodiments, the abutting surfaces 58b and 68b may be omitted from the pin portions 58a and 68a to form a pin portion having a circular cross section.

  In addition, in the range which does not deviate from the meaning of the present invention, the swing type clamp device according to the first to fourth embodiments can be implemented by adding various modifications other than the above-described disclosure items. It is applicable to the swing type clamp device.

Claims (14)

A clamp body, a clamp rod supported by the clamp body so as to be movable back and forth in the axial direction and rotatable about the axis, a clamp arm attached to the tip of the clamp rod, and releasing the clamp arm A drive means for driving the clamp rod to move forward and backward and to rotate in a switchable manner between the clamp position moved to the axially retracted position relative to the position and the clamp release position and swung around the axial center. In the swing type clamping device provided,
An attachment block fixed to the tip of the clamp rod and detachably mounted with a clamp arm;
At least one clamp force transmission pin that is integrally connected to the attachment block in a state in which the clamp arm is positioned, the clamp force transmission pin being inserted into the attachment block and the clamp arm from a direction orthogonal to the axial center; and
A swing-type clamping device comprising:   2. The swing type clamp device according to claim 1, wherein a positioning portion for positioning the clamp arm in the axial direction and around the axial center is provided in the attachment block.   The swing-type clamp device according to claim 1 or 2, wherein the clamp arm is attached to the attachment block in an outer fitting manner.   The swing clamp device according to claim 2, wherein the attachment block is formed in a rectangular block shape, and a rectangular hole into which the attachment block is fitted is formed in the clamp arm.   The tip end portion of the clamp rod is formed in a tapered shaft portion whose diameter decreases toward the tip end side, and a tapered shaft hole into which the taper shaft portion is fitted is formed in the attachment block. The swing type clamp device according to any one of the above.   The attachment block is formed with a shaft hole into which the tip end portion of the clamp rod is fitted, and a dividing portion connected to the shaft hole, and the attachment block is fastened and elastically deformed through the dividing portion to closely contact the tip portion of the clamp rod. The swing type clamping device according to claim 1, further comprising a fastening bolt that is fixed in a shape. A clamp body, a clamp rod supported by the clamp body so as to be movable back and forth in the axial direction and rotatable about the axis, a clamp arm attached to the tip of the clamp rod, and releasing the clamp arm A drive means for driving the clamp rod to move forward and backward and to rotate in a switchable manner between the clamp position moved to the axially retracted position relative to the position and the clamp release position and swung around the axial center. In the swing type clamping device provided,
An attachment block fixed to the tip of the clamp rod and detachably mounted with a clamp arm;
A clamping force transmission pin portion provided on one of the attachment block and the clamp arm in a direction parallel to the direction perpendicular to the axis;
A pin engaging portion that is provided on the other of the attachment block and the clamp arm, and that the pin portion engages with the attachment block so that the both can be integrally connected with the clamp arm attached to the attachment block;
When the clamp arm is attached to and detached from the attachment block, the pin portion is configured to be engaged with and disengaged from the pin engaging portion from a direction perpendicular to the axial direction and perpendicular to the center line direction of the pin portion. A swing type clamping device.   8. The attachment block and the clamp arm, comprising a pin hole formed in a penetrating manner in parallel with a center line direction of the pin portion, and a clamp force transmitting pin inserted into the pin hole. The swing type clamp device as described.   The swing type clamp device according to claim 8, wherein the pin portion and the clamp force transmission pin are disposed on both sides of the clamp rod in the length direction of the clamp arm.   10. One of the attachment block and the clamp arm is fitted with one clamping force transmission pin member in an insertion shape, and the pin portion is configured by the clamping force transmission pin member. A swing type clamping device according to claim 1.   The attachment block is formed in a rectangular block shape, a bifurcated portion is formed in the proximal end side portion of the clamp arm, and the proximal end open shape in which the attachment block is accommodated in an inner fitting shape in a portion including the bifurcated portion of the clamp arm A swing type clamping device according to any one of claims 7 to 10, wherein an accommodating recess is formed.   The pair of pin portions and the pin engaging portion are provided symmetrically in the width direction of the clamp arm, and the pair of pin portions are disposed closer to the proximal end side of the clamp arm than the clamp force transmission pin, and the attachment block The pair of pin engaging portions are formed of a pair of U-shaped grooves cut out from a proximal end portion at a bifurcated portion of the clamp arm. Swing type clamp device as described in 4.   The pin portion is disposed on the proximal end side of the clamp arm with respect to the clamp force transmission pin and is attached to the bifurcated portion of the clamp arm, and the pin engaging portion is notched from the proximal end portion to the attachment block. The swing type clamping device according to claim 11, wherein the swing type clamping device is formed of a U-shaped groove.   The swing according to any one of claims 7 to 13, wherein a contact surface capable of contacting a smooth surface parallel to a direction perpendicular to the axis of the pin engaging portion is formed on an outer peripheral portion of the pin portion. Type clamping device.