JP2006289530A - Work clamp device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a work clamp device for clamping and unclamping a work, by simplifying a structure, while improving workability. <P>SOLUTION: In this work clamp device 1, since an upper end surface 30a of a releasing rod 30 is arranged inside an upper end surface 34a of a cylindrical body 34 so that both the upper end surface 34a of the cylindrical body 34 pressed for operating a pressing means 11 and the upper end surface 30a of the releasing rod 30 pressed for operating a releasing means 12 face upward, pressing work by a hand 55 of a carrying robot is facilitated, and the structure is also simplified and miniaturized, and an occupying space in a tool 2 can be reduced. In the work clamp device 1, since energizing force of a first coil spring 35 arranged inside is converted into pressing force to an upper surface of the work W of a clamp arm 10, the structure is simplified more than a conventional clamp device using hydraulic pressure. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a workpiece clamping device for clamping a workpiece to a jig.

  2. Description of the Related Art Conventionally, as a workpiece clamping device for mounting a workpiece to a jig, for example, a hydraulic cylinder is provided, and a hydraulic cylinder is arranged therein, and a clamp arm is slid vertically by hydraulic pressure to clamp and unclamp the workpiece. Alternatively, various work clamping devices such as a hand-tightened clamping device that clamps and unclamps a workpiece by manually tightening a bolt and sliding a clamp arm in a vertical direction are employed.

  In the former hydraulic clamping device, it is necessary to arrange a hydraulic cylinder or the like inside, and further, a hydraulic pump and piping for pressure-feeding hydraulic pressure are required, which complicates the structure and increases costs. In addition, maintenance is not effective because it requires man-hours.

  Further, the latter manual clamping apparatus requires an operation of tightening a bolt, and the operation time for clamping the workpiece becomes long, resulting in poor work efficiency.

  Therefore, Patent Document 1 discloses a conventional work clamping device that can clamp and unclamp a workpiece without using hydraulic pressure, pneumatic pressure, or the like. The taper local part is advanced in the direction until it contacts the bottom side surface of the fixing guide, and the steel ball moves in the centrifugal direction so that the propulsion conversion shaft is moved backward against the urging force of the coil spring, and the clamp plate is moved away from the workpiece. Unclamp. On the other hand, when clamping the workpiece, the draw shaft is moved backward in the axial direction so that the taper local portion is separated from the bottom side surface of the fixing guide, and the steel ball is gradually moved toward the center of the housing by the biasing force of the coil spring. It is disclosed that the thrust plate is advanced while the clamp plate is clamped to the workpiece.

  However, the invention of this Patent Document 1 controls the relaxation of the workpiece by the clamp plate by moving the propulsion conversion shaft back and forth by pushing back the draw shaft, and the workpiece clamping and unclamping from the same direction. Cannot be performed by the pressing operation, and workability is poor.

As a prior art that solves the above-mentioned problems, Patent Document 2 discloses a work clamping device that can perform operations of clamping and unclamping a workpiece by pressing operations from the same direction.
In Patent Document 2, a clamp rod and a clamp release rod are projected in parallel to each other with a space in the vertical direction from the case. When the clamp rod is pressed toward the case side, the compression coil spring The spring force is transmitted to the lock claw via the clamp release rod, and this lock claw engages with the end surface of the slider, and the slider is fixed at the retreat limit position, and the clamp arm is pushed out to the clamp position to work. Is clamped. On the other hand, when the clamp release rod is pressed until it moves to the retreat limit position, the engaging part of the lock claw is pressed by the clamp release rod and rotates so that the stopper part moves away from the slider. It is disclosed that the rod is driven in the forward direction by the spring force of the compression coil spring together with the slider, and the clamp arm is moved to the retracted position to unclamp the workpiece.
JP 7-290332 A JP 2003-165037 A

  However, in the invention of Patent Document 2, the structure for transmitting the pressing force applied to the clamp rod and clamp release rod to the clamp arm is very complicated, and the clamp rod and clamp release rod are removed from the case. Since the projections are arranged in parallel with an interval in the vertical direction, the size of the device itself needs to be increased, and it is necessary to secure a large space for the clamping device itself, and there is still room for improvement.

  This invention is made | formed in view of this point, and it aims at providing the workpiece clamp apparatus which clamps and unclamps a workpiece | work, simplifying a structure, improving workability | operativity.

As a means for solving the above-mentioned problems, the present invention provides a work clamping device according to claim 1, wherein the workpiece clamping device clamps a workpiece on a jig. A clamp arm that contacts the workpiece; a pressing unit that presses the clamp arm against the workpiece; and a release unit that releases the pressing of the clamp arm against the workpiece by the pressing unit. Each means is operated by a pressing operation from the same direction, and the second pressing surface of the releasing means is arranged inside the first pressing surface of the pressing means.
According to a second aspect of the present invention, there is provided the work clamp device according to the first aspect, wherein the pressing means is slidable, and a cylindrical body having a first coil spring therein, and a slidable inside the cylindrical body. A cylindrical transmission member that transmits the repulsive force of the first coil spring to the clamp arm when the one end surface, which is the first pressing surface of the cylindrical body, is pressed, and the cylindrical body. A hook that is slidable in a direction to be engaged with the cylinder, and the hook is engaged with the cylinder in a state where the first coil spring is compressed, and the state is maintained. The release means is slidably inserted into the transmission member, and one end surface of the second pressing surface is pressed, and the second coil spring is configured to urge the hook. Hook the second carp Slide against the biasing force of the spring, is characterized in being composed of release rod to release the engagement between the cylindrical member and the hook.
According to a third aspect of the present invention, there is provided the work clamp device according to the second aspect, wherein the release-side rod is provided with a rod-side flange portion at a position where it can come into contact with one end surface of the transmission member. A hook side flange portion is provided on the rod side, and a third coil spring is disposed between the rod side flange portion and the hook side flange portion.

Therefore, in the invention of the workpiece clamping device according to the first aspect, when the first pressing surface of the pressing means is pressed, the clamp arm moves to the workpiece side, the workpiece is pressed by the clamp arm, and the workpiece becomes the jig. Clamped. On the other hand, when the second pressing surface of the releasing means is pushed in, the pressing of the clamp arm against the work by the pressing means is released, and the work is unclamped from the jig.
Moreover, since the 2nd press surface of a cancellation | release means is arrange | positioned inside the 1st press surface of a press means, work clamp apparatus itself is reduced in size.
In the invention of the work clamp device according to the second aspect, when the one end surface (first pressing surface) of the cylinder is pushed in, the first coil spring in the cylinder is compressed and the transmission member slides to the work side together with the clamp arm. Then, when the clamp arm comes into contact with the workpiece and the first coil spring is further compressed, the repulsive force is transmitted to the clamp arm via the transmission member, and the clamp arm presses the workpiece. At the same time, the hook is engaged with the cylindrical body in which the first coil spring is compressed, and the urging force of the second coil spring is applied to the hook so that this state is maintained. The pressing state of the arm against the workpiece is maintained.
On the other hand, when one end surface (second pressing surface) of the release rod slidably inserted into the transmission member is pushed, the hook slides against the urging force of the second coil spring, and the hook and the cylindrical body The engagement is released, the compressed state of the first coil spring is released, and the pressing state against the workpiece by the clamp arm is released.
In the invention of the workpiece clamping device according to the third aspect, the one end surface (second pressing surface) of the release rod is pressed to release the release state of the clamp arm after the pressing state of the clamp arm to the workpiece is released. Then, the urging force of the third coil spring returns the release rod, the transmission member, and the clamp arm to their original positions, and the clamp arm is detached from the workpiece.

  According to the present invention, it is possible to provide a work clamping device that improves workability, simplifies the structure, and clamps and unclamps the work.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to FIGS.
As shown in FIGS. 2 and 7, the workpiece clamping device 1 according to the embodiment of the present invention is fixed to a plurality of fixing holes 5 provided at predetermined positions of the jig 2 to which the workpiece W is clamped. ing.
As shown in FIG. 8, the jig 2 includes substantially L-shaped brackets 7 fixed at positions spaced from the floor surface of the columns 6, 6 between the plurality of columns 6, 6 standing upright. , 7.
Further, as shown in FIG. 7, the jig 2 includes a plurality of positioning pins 3 for positioning the workpiece W in the planar direction and a plurality of reference seats 4 for positioning the workpiece W in the height direction (work clamping device 1 The same number).
The jig 2 is rotated in the paper surface direction of FIG. 8 in correspondence with the work process of the workpiece W clamped at a predetermined position by the plurality of (three in FIG. 7) work clamp devices 1 provided. It comes to be moved.

As shown in FIGS. 1 and 2, the work clamp device 1 according to the embodiment of the present invention is movable in the vertical direction and is in contact with the upper surface of the work W, and the clamp arm. A pressing unit 11 that presses the workpiece 10 against the workpiece W and a release unit 12 that releases the pressing of the clamp arm 10 against the workpiece W by the pressing unit 11 are provided.
As shown in FIG. 7, a plurality of the work clamp devices 1 are provided in the jig 2, and each clamp arm 10 of each work clamp device 1 is mounted on the reference seat 4 of the jig 2 as shown in FIG. The whole workpiece W is clamped to the jig 2 by pressing one part of the workpiece W placed on the jig.

  As shown in FIGS. 1 and 2, the pressing means 11 and the releasing means 12 that are the configuration of the work clamping device 1 are provided in a housing 13 formed of a substantially circular cylindrical body. Is closed by a substantially circular cover 14. An opening 25 is formed in the approximate center of the cover 14.

  As shown in FIG. 2, the housing 13 is formed with a substantially circular insertion hole 15 extending in the vertical direction substantially at the center of the upper wall. Below the insertion hole 15, there is formed a substantially circular first concave portion 17 that communicates with the insertion hole 15 and has a larger diameter than the insertion hole 15 and opens downward. A substantially annular upper step 16 is provided between the upper end and the lower end of the insertion hole 15. Furthermore, a substantially elliptical second recess 18 is formed below the first recess 17 so as to communicate with the first recess 17 and have a larger diameter than the first recess 17 and open downward. A substantially annular lower step 19 is provided between the upper end of the second recess 18 and the lower end of the first recess 17.

In addition, the outer shape of the housing 13 is formed in a substantially circular shape as seen from FIG. 1 in a top view, and in a side view, the plane 20 extends in a substantially horizontal direction in order from the top as shown in FIG. An inclined surface 21 inclined continuously downward from the flat surface 20 toward the outside, a large-diameter outer peripheral surface 22 continuously extending from the inclined surface 21 in a substantially vertical direction, and the large-diameter outer peripheral surface 22. And a small-diameter outer peripheral surface 23 that extends continuously in the vertical direction through the step 24.
The small-diameter outer peripheral surface 23 of the housing 13 is brought into contact with the inner peripheral surface of the fixing hole 5 of the jig 2 and the stepped portion 24 is brought into contact with the upper surface of the jig 2. It becomes fixed.

  As shown in FIGS. 1 and 2, the clamp arm 10 is formed in a plate shape having a narrow width and a predetermined length. Further, the clamp arm 10 is formed with a slide hole 29 at one end thereof through which a later-described release rod 30 is slidable in the vertical direction, and the lower surface at the other end is an upper surface of the workpiece W. A pressing portion 28 to be pressed protrudes downward. Furthermore, the upper end surface of the small diameter part 32 of the transmission member 31 mentioned later is fixed to this clamp arm 10 at the lower surface around the sliding hole 29 provided at one end.

  As shown in FIG. 2, the pressing means 11 is slidable vertically in the insertion hole 15 of the housing 13, and has a cylindrical body (tubular body) 34 having a first coil spring 35 therein, and the cylindrical body 34. Is slidable in the vertical direction, and the transmission member 31 transmits the repulsive force of the first coil spring 35 to the clamp arm 10 when the upper end surface (first pressing surface) 34a of the cylindrical body 34 is pressed. A pair of hooks 36, 36 that can be engaged with the cylindrical body 34, are slidable in the direction in which the cylindrical body 34 is engaged, and the engagement is released (left-right direction in FIG. 1), The hooks 36 and 36 are engaged with the cylindrical body 34 in a state where the first coil spring 35 is compressed, and the second coil springs 38 and 38 that bias the hooks 36 and 36 so that the state is maintained. It is configured.

Each member which comprises the press means 11 mentioned above is demonstrated still in detail.
As shown in FIGS. 1 and 2, the cylindrical body 34 is formed of a substantially circular cylindrical body, and a cylindrical body side engaging claw portion 40 protrudes outward in a substantially horizontal direction at the lower end periphery thereof. Yes. In addition, the transmission member 31 is slidably contacted in the vertical direction in the cylindrical body 34, and a first coil spring 35 is disposed above the transmission member 31.
The cylindrical body 34 is slidably contacted in the insertion hole 15 provided in the upper wall of the housing 13 so as to be slidable in the vertical direction.

As shown in FIGS. 1 and 2, the transmission member 31 is formed of a cylindrical body having a through hole 41 extending in the vertical direction substantially at the center, and a substantially circular large-diameter portion 33 and a small-diameter portion 32. The small-diameter portion 32 is disposed above the large-diameter portion 33, and the upper end of the small-diameter portion 32 protrudes from the opening 42 provided in the upper wall of the cylindrical body 34, and is around the sliding hole 29 provided at one end of the clamp arm 10. It is fixed to the lower surface of the. Further, the outer peripheral surface of the large diameter portion 33 is in contact with the inner peripheral surface of the cylindrical body 34.
The first coil spring 35 described above has its upper end in contact with the lower surface of the upper wall of the cylindrical body 34 and its lower end in contact with the upper end surface of the large-diameter portion 33 of the transmission member 31. Be placed. The spring strength of the first coil spring 35 will be described in detail later.

As shown in FIGS. 2 and 5, the hook 36 has a hook-side flange portion 43 that is provided at the lower end and has a substantially semicircular shape as viewed from above and a curved outer peripheral edge of the hook-side flange portion 43. An outer peripheral wall 45 erected from a predetermined range centered on a position where the angle from the linearly extending end surface 47 is about 90 °, and substantially horizontally from the upper peripheral edge of the outer peripheral wall 45 to the hook side flange portion 43 side. It is comprised from the hook side engaging nail | claw part 45 protrudingly provided.
Further, as shown in FIG. 5, the hook 36 is formed with a semicircular groove 48 having a substantially semicircular shape substantially at the center of an end face 47 extending linearly of the hook side flange 43. As shown in FIG. 2, an inclined surface 49 is formed on the inner periphery of the upper end of the semicircular groove portion 48. Further, as shown in FIGS. 2 and 5, the hook side flange portion 43 of the hook 36 is formed with a semi-elliptical groove portion 46 into which the second coil spring 38 can be inserted, as shown in FIGS. 2 and 5. Yes. The groove 46 is formed to have a predetermined length from the outer peripheral surface of the hook-side flange portion 43 toward the center at a position overlapping the hook-side engagement claw portion 45 in the bottom view shown in FIG.
Further, as shown in FIG. 2, the hook 36 has an upper surface of the hook-side engaging claw portion 45 abutting against a lower step portion 19 provided in the housing 13, so that the hook 36 enters the second recess 18 in the housing 13. It is set to a height that can be accommodated.
As shown in FIGS. 2 and 5, two hooks 36 are provided so that the hook side flange portion 43 and the hook side engaging claw portion 45 face each other, and the top view shape forms a substantially circular shape. The pair of hooks 36 and 36 are slidably arranged in the second recess 18 provided in the housing 13 in a direction approaching and moving away from each other (left and right direction in FIG. 1).

  As shown in FIG. 2, the second coil springs 38, 38 are respectively disposed between the inner end surfaces of the grooves 46, 46 of the hooks 36, 36 and the inner peripheral surface forming the second recess 18 of the housing 13. ing. Each of the second coil springs 38 and 38 is urged so that the hooks 36 and 36 slide in the directions close to each other, and the spring strength of each of the second coil springs 38 will be described in detail later.

As shown in FIGS. 1 and 2, the release means 12 is slidable in the vertical direction in the slide hole 29 at one end of the clamp arm 10 and the through hole 41 provided in the transmission member 31 in the cylindrical body 34. It is comprised by the cancellation | release rod 30 inserted.
The release rod 30 is composed of a rod-shaped body having a predetermined length. As shown in FIG. 2, a taper portion 50 is formed at the lower end of the release rod 30, and a gap between the taper portion 50 and the transmission member 31 is increased. A rod-side flange portion 51 is formed at a position where it can come into contact with the lower end surface (one end surface) 33 a of the diameter portion 33.
The tapered portion 50 is formed in a triangular pyramid shape with the apex facing downward, and the inclined surface 49 is provided on each inclined surface 49 provided on the inner peripheral edge of the upper end of each semicircular insertion hole 48, 48 of each hook 36, 36. , 49.
The rod side flange portion 51 is formed of a substantially circular plate-like body, and the outer diameter thereof is set to be substantially the same as the outer diameter of the large diameter portion 33 of the transmission member 31.

  As shown in FIG. 2, a third coil spring 52 is disposed between the hook side flanges 43, 43 of the hooks 36, 36 and the rod side flange portion 51 of the release rod 30. The spring strength of the third coil spring 52 will be described in detail later.

Next, the operation of the work clamp device 1 according to the embodiment of the present invention will be described with reference to FIGS.
First, FIG. 2 shows a state in which the workpiece W is unclamped by the jig 2, and the first coil spring 35 is in a state in which a gap is provided between the protruding portion 28 of the clamp arm 10 and the upper surface of the workpiece W. The cylinder side engagement claw portion 40 provided at the peripheral edge of the lower end of the cylindrical body 34 has a repulsive force that can be balanced with the third coil spring 52 in order to maintain the It is in a state of being engaged with the upper step 16 in the housing 13. This state is the upper limit position of the cylindrical body 34.
Further, each of the second coil springs 38 and 38 has a repulsive force that slides the pair of hooks 36 and 36 in the approaching direction, but is in an extended state. The side engaging claws 45, 45 are arranged so as to be positioned below the cylindrical body engaging claw portion 40 of the cylindrical body 34.
Furthermore, the third coil spring 52 also supports the release rod 30, the transmission member 31, and the clamp arm 10, and maintains a state in which a gap is provided between the protrusion 28 of the clamp arm 10 and the upper surface of the workpiece W. The release rod 30 has a repulsive force that can be balanced with the first coil spring 35, but is in an extended state. The release-side rod 30 has a rod-side flange portion 51 below the large-diameter portion 33 of the transmission member 31. While being in contact with the end surface 33a, the tip of the tapered portion 50 is in contact with the inclined surfaces 49, 49 of the semicircular groove portions 48, 48 of the pair of hooks 36, 36. This state is the upper limit position of the release rod 30, and the pair of hooks 36, 36 is not slid in the direction approaching each other from the state of FIG.

When the workpiece W is clamped to the jig 2 by the workpiece clamping device 1, the cylindrical body 34 of the workpiece clamping device 1 is moved by the hand 55 of the transfer robot (not shown) in the state shown in FIG. The end surface (first pressing surface) 34a is pressed from above.
Then, as shown in FIG. 3, the first coil spring 35 is compressed, and the clamp arm 10 moves downward together with the transmission member 31 until the protruding portion 28 of the clamp arm 10 contacts the upper surface of the workpiece W. At this time, the release rod 30 also has its rod-side flange portion 51 pressed by the large-diameter portion 33 of the transmission member 31 to move downward by the same amount as the movement amount of the clamp arm 10, and a taper provided at the lower end thereof. The portion 50 slides along the inclined surfaces 49, 49 of the semicircular grooves 48, 48 of the pair of hooks 36, 36, and the pair of hooks 36, 36 are slightly slid in a direction away from each other.

After that, when the upper end surface 34a of the cylindrical body 34 is continuously pressed by the hand 55 of the transfer robot, the cylindrical body 34 continues to slide downward while further compressing the first coil spring 35, and the cylindrical body 34 The hook-side engagements of the pair of hooks 36 and 36 in a state where the cylinder-side engagement claw portion 40 provided at the lower peripheral edge slides downward in the first recess 17 in the housing 13 and slightly slides away from each other. Engaged with the pawl portions 45, 45.
In addition, when the cylinder side engaging claw portion 40 of the cylindrical body 34 gets over the hook side engaging claw portions 45 and 45 of the hooks 36 and 36 and is engaged, The pair of hooks 36, 36 are moved away from each other against the biasing force of the second coil springs 38, 38 while the inclined surfaces are in contact with the inclined surfaces of the upper surfaces of the hook side engaging claws 45, 45. While sliding, the cylinder side engaging claw portion 40 of the cylindrical body 34 gets over the hook side engaging claw portions 45 and 45 of the hooks 36 and 36 and is engaged.
At this time, the pressing operation on the upper end surface 34a of the cylindrical body 34 by the hand 55 of the transport robot is finished.

3 is the state in which the upper surface of the work W is pressed by the clamp arm 10 of the work clamping device 1, that is, the repulsive force of the first coil spring 35 that is maintained in the compressed state causes the transmission member 31 to move. By being transmitted to the clamp arm 10 via, the projection 28 of the clamp arm 10 presses the upper surface of the workpiece W. This pressing force is approximately the same as the pressing force by a conventional hydraulic clamping device or the like, and is about 300 kg. The first coil spring 35 is flexibly equivalent to the height of the first recess 17 in the housing 13 from the state shown in FIG. In other words, it has a spring strength with a repulsive force of about 300 kg.
Further, in the state of FIG. 3, the pair of hooks 36 and 36 are urged in the direction in which they are approached by the urging force of the second coil springs 38 and 38. The hook side engaging claws 45, 45 are maintained in a state where they are engaged with the cylindrical side engaging claws 40 of the cylindrical body 34 in a state where the first coil spring 35 is compressed, and the workpiece of the clamp arm 10 is maintained. The pressing state of W on the upper surface is maintained.
The second coil spring 38 has such a spring strength that the hook 36 can be slid. The second coil spring 38 has a bending amount according to the state shown in FIG. 2 and its repulsive force is the weight of the hook 36, the hook 36 and the cover. 14 has a spring strength that is about the load combined with the frictional force of 14.

  When the operator recognizes that the pressing operation to the upper end surface 34a of the cylindrical body 34 by the hand 55 of the transfer robot is completed, the operator can use the plane 20 of the housing 13 of the cylindrical body 34. It is possible to recognize that the pressing operation is completed by visually recognizing a predetermined amount of protrusion from.

Next, when the workpiece W is unclamped from the jig 2 by the workpiece clamping device 1, the upper end surface (second pressing surface) 30a of the release rod 30 is moved by the hand 55 of the transfer robot in the state shown in FIG. Is pressed from above.
Then, as shown in FIG. 4, the third coil spring 52 is compressed, and the taper portion 50 provided at the lower end of the release rod 30 is changed to each of the semicircular groove portions 48, 48 of the pair of hooks 36, 36. It is slid downward along the inclined surfaces 49, 49, and the tip of the tapered portion 50 is inserted through the opening 25 of the cover 14 and protrudes further downward from the opening 25. At the same time, the pair of hooks 36, 36 are slid in a direction away from each other against the urging force of the second coil springs 38, 38 and accommodated in the second recess 18 of the housing 13. The engagement between the hook side engaging claws 45 and 45 of the hooks 36 and 36 and the cylinder side engaging claw portion 40 of the cylindrical body 34 is released.

Thereafter, as shown in FIG. 4, the cylindrical body 34 is slid upward by the biasing force of the first coil spring 35 until the cylinder-side engagement claw portion 40 is locked to the upper step portion 16 in the housing 13. The At this time, the first coil spring 35 is fully extended, and the pressure on the upper surface of the workpiece W by the projection 28 of the crank arm 10 is released, and the projection 28 is moved by the weight of the clamp arm 10 and the transmission member 31. It simply comes into contact with the top surface.
At this time, the pressing operation on the upper end surface 30a of the release rod 30 by the hand 55 of the transport robot is finished.
When the operator recognizes that the pressing operation to the upper end surface 30a of the release rod 30 by the hand 55 of the transfer robot is completed, the cylindrical body 34 slides upward from the plane 20 of the housing 13. Thus, when the upper end surface 34a approaches the lower surface of the clamp arm 10, it can be recognized that the pressing operation is completed.

Finally, in the state of FIG. 4, when the transfer robot hand 55 is separated from the upper end surface 30a of the release rod 30, the release rod 30 is moved upward by the biasing force of the third coil spring 52 as shown in FIG. And the rod-side flange portion 51 of the release rod 30 abuts on the lower end surface 33a of the large-diameter portion 33 of the transmission member 31 to slightly compress the first coil spring 35, while the transmission member 31 and the clamp arm 10 is moved upward. Then, the protruding portion 28 of the clamp arm 10 is detached from the upper surface of the workpiece W, and a gap is generated between the protruding portion 28 and the upper surface of the workpiece W.
The third coil spring 52 slides the release rod 30 upward to support the release rod 30, the transmission member 31, and the clamp arm 10 as shown in FIG. And the first coil spring 35 so as to maintain a state where a gap is provided between the upper surface of the workpiece W and the upper surface of the workpiece W.

  As described above, in the work clamp device 1 according to the embodiment of the present invention, as shown in FIGS. 1, 2, and 6, the predetermined width of the cylindrical body 34 that is pressed to operate the pressing means 11. The upper end surface (first pressing surface) 34a extending in a substantially annular shape and the substantially circular upper end surface (second pressing surface) 30a of the release rod 30 pressed to operate the release means 12 are both As shown in FIG. 6, the second pressing surface 30 a for operating the release means 12 is arranged inside the first pressing surface 34 a for operating the pressing means 11. The center points O are arranged so as to substantially coincide with each other.

  As described above, according to the work clamp device 1 according to the embodiment of the present invention, the upper end surface (first pressing surface) 34a of the cylindrical body 34 that is pressed to operate the pressing means 11, and the release. Since the upper end surface (second pressing surface) 30a of the release rod 30 that is pressed to operate the means 12 is arranged so as to face upward, the pressing operation by the hand 55 of the transport robot becomes easy. The work efficiency of the work W clamping and unclamping work is improved. Moreover, the second pressing surface 30a for operating the releasing means 12 is arranged inside the first pressing surface 34a for operating the pressing means 11, and is arranged so that the respective center points O are substantially coincident. Therefore, the space occupied by the jig 2 can be reduced without increasing the size of the work clamp device 1 itself.

  Further, the work clamping device 1 according to the embodiment of the present invention converts the urging force of the first coil spring 35 into the pressing force to the upper surface of the workpiece W by the clamp arm 10, and the hydraulic clamping device or the like as in the prior art. Therefore, the structure is simplified and handling is very easy.

FIG. 1 is a perspective view of a workpiece clamping device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a state in which the workpiece is unclamped to the jig by the workpiece clamping device. FIG. 3 is a cross-sectional view showing a state in which the workpiece is clamped to the jig by the workpiece clamping device. FIG. 4 is a cross-sectional view showing a state at the moment when the workpiece is unclamped by the workpiece clamping device. 5A and 5B show a pair of hooks as a configuration of the pressing means of the work clamping device, where FIG. 5A is a bottom view and FIG. 5B is a side view. FIG. 6 is a diagram showing an arrangement of a first pressing surface for operating the pressing means and a second pressing surface for operating the releasing means. FIG. 7 is a perspective view showing a state in which the entire workpiece is clamped by a plurality of workpiece clamping devices. FIG. 8 is a side view showing a state in which the jig is arranged.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Work clamp apparatus, 2 Jigs (jig plate), 10 Clamp arm, 11 Press means, 12 Release means, 30 Release rod, 30a Upper end surface (2nd press surface), 31 Transmission member, 32 Small diameter part, 33 Large-diameter portion, 33a Lower end surface (one end surface), 34 Cylindrical body (tubular body), 34a Upper end surface (first pressing surface), 35 First coil spring, 36 hook, 38 Second coil spring, 40 Cylinder side engaging claws Part, 43 hook side flange part, 45 hook side engaging claw part, 51 rod side flange part, 52 third coil spring, W work

Claims (3)

A workpiece clamping device for clamping a workpiece to a jig,
The workpiece clamping device includes: a clamp arm that is in contact with the workpiece; a pressing unit that presses the clamp arm against the workpiece; and a release unit that releases the pressing of the clamp arm against the workpiece by the pressing unit. The pressing means and the releasing means are each operated by a pressing operation from the same direction, and the second pressing surface of the releasing means is disposed inside the first pressing surface of the pressing means. Work clamp device. The pressing means is slidable, and has a cylindrical body having a first coil spring therein, and is slidably arranged inside the cylindrical body, and when one end surface which is the first pressing surface of the cylindrical body is pressed. Further, a cylindrical transmission member that transmits the repulsive force of the first coil spring to the clamp arm, a hook that is engageable with the cylinder, and is slidable in a direction to be engaged with the cylinder, The hook is engaged with the cylindrical body in a state where the first coil spring is compressed, and is configured by a second coil spring that urges the hook so that the state is maintained. The hook is slidably inserted into the transmission member and the one end surface which is the second pressing surface is pressed to slide the hook against the urging force of the second coil spring. Release the engagement with the body Work clamp apparatus according to claim 1, characterized in that they are composed of removal rod. The release rod is provided with a rod-side flange at a position where it can come into contact with one end face of the transmission member, the hook is provided with a hook-side flange, and the rod-side flange and the hook-side flange are between The work coil clamping device according to claim 2, wherein a third coil spring is arranged on the work clamp.

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