JP2014226770A - Workpiece fixation pawl, vice and workpiece clamp method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To raise processing accuracy of a workpiece by raising a wedge action of a pawl to certainly prevent floating of the pawl in workpiece clamp.SOLUTION: A workpiece fixation pawl 1 for clamping a workpiece comprises: a slider 2 which is pressed and brought into contact with the workpiece; and a slide holder 3 which holds the slider 2, in which the slider 2 has an approximate hemispherical projection 5, an outer peripheral surface 5a of the projection 5 is a circular arc projected surface shape and with a taper going downward, on the other hand, a front surface side of the slide holder 3 is provided with a recess 7 into which the projection 5 of the slider 2 engages, the recess 7 is formed in an approximate hemisphere corresponding to the shape of the projection 5 of the slider 2, an inner peripheral surface 7a of the recess 7 has a circular arc concave surface shape, a taper going downward at an inclination angle corresponding to the outer peripheral surface 5a of the projection 5 of the slider 2 is provided on the inner surface 7a, and the slider 2 slides in an oblique vertical direction along the inner peripheral surface 7a of the recess 7 of the slide holder 3.

Description

  The present invention relates to a workpiece fixing claw for fixing a workpiece to a table or work table of a machine tool when machining a workpiece with a machine tool or the like, a vise provided with the workpiece fixing claw, and a workpiece clamping method using the vice. .

  When a workpiece is fixed with a machine tool or the like, a vise is used to fix the workpiece. A simple vise generally clamps by clamping a workpiece with fixing claws arranged on both sides of the workpiece, but the lifting of the nail at the time of clamping becomes a problem. Conventionally, for example, Patent Documents 1, 2, and 3 are known as means for preventing nail lifts.

  However, the conventional vices disclosed in Patent Documents 1, 2, and 3 are difficult to apply to a simple vise because the apparatus itself is enlarged and the clamp structure is complicated.

JP 2002-18736 A JP 2005-288599 A No. 2006-123617

  Therefore, in order to solve the above problem, the applicant has proposed a vise that prevents the nail from lifting by clamping the workpiece with a nail having a wedge action (Japanese Patent Application No. 2011-251202).

  An object of the present invention is to increase the machining accuracy of a workpiece by further enhancing the wedge action of the nail and reliably preventing the nail from lifting during clamping.

  In order to solve the above-described problems, a workpiece fixing claw according to the present invention includes a slider that is pressed against a workpiece and a slide holder that holds the slider, and the slider has a substantially hemispherical convex portion. The outer peripheral surface of the convex portion has an arcuate convex shape and is tapered downward. On the other hand, a concave portion into which the convex portion of the slider is fitted is provided on the front side of the slide holder. It is formed in a substantially semicircular shape corresponding to the shape of the convex portion of the slider, the inner peripheral surface of the concave portion has an arcuate concave shape, and the inner peripheral surface corresponds to the outer peripheral surface of the convex portion of the slider The slider is tapered downward at an angle, and the slider slides obliquely up and down along the inner peripheral surface of the concave portion of the slide holder.

  The vise according to the present invention includes a workpiece fixing claw, a driving mechanism for moving the workpiece fixing claw on the base, a lock mechanism for connecting / releasing the workpiece fixing claw and the driving mechanism, and a slider for the workpiece fixing claw. And an external force applying means for sliding the workpiece in a slanting vertical direction. When the workpiece fixing claw and the driving mechanism are connected by the lock mechanism, the workpiece fixing claw moves on the base by the operation of the driving mechanism, and the workpiece fixing When the claw and the drive mechanism are released, the slider slides obliquely up and down by the operation of the external force applying means.

  Further, according to the work clamping method of the present invention, the work fixing claw is moved on the base integrally with the nut of the drive mechanism by the operation of the drive mechanism of the vise, and comes into contact with the work arranged on the base so that the screw shaft of the drive mechanism. When a predetermined torque is generated, the lock mechanism is released, the rotational force is transmitted to the screw member disposed on the slider by the rotation of the nut together with the screw shaft, and the work is clamped by sliding the slider obliquely downward.

  According to the workpiece fixing claw according to the present invention, since the convex portion of the slider that is in pressure contact with the workpiece is fitted into the concave portion of the slide holder that holds the slider, there is almost no rattling with respect to the slider holder. In this state, the slider is held, and a stable movement can be achieved even when the slider is slid obliquely up and down along the concave portion of the slide holder.

  In addition, according to the vice according to the present invention, when clamping a workpiece, the vise includes an external force applying means for sliding the slider of the workpiece fixing claw obliquely downward, so that the pressure contact force to each workpiece is kept uniform. As a result, the machining accuracy and machining quality of the workpiece can be improved. Further, the wedge action of the slider can be further enhanced by using the external force applying means, and the clamping force against the workpiece can be increased, and at the same time, the workpiece fixing claw can be reliably prevented from rising.

  Further, according to the work clamping method according to the present invention, the movement of the workpiece fixing claw on the base and the movement of clamping the workpiece by sliding the slider of the workpiece fixing claw obliquely downward can be continuously performed. The work processing efficiency can be improved and the work load can be reduced.

It is a disassembled perspective view which shows one Embodiment of the workpiece | work fixing nail | claw which concerns on this invention. It is a top view of the work fixing claw concerning the present invention. It is AA sectional drawing of the said FIG. It is a rear view of the workpiece | work fixing nail | claw which concerns on this invention. It is a front view of a slide female screw holder. It is BB sectional drawing of the said FIG. It is the perspective view which carried out the cross section which shows 1st Embodiment of the vice which concerns on this invention. It is a longitudinal cross-sectional view of the side surface which shows the motion of the vise when the locking mechanism is operating. It is a longitudinal cross-sectional view of the side surface which shows the motion of the vise when a locking mechanism is cancelled | released. It is CC sectional drawing of the said FIG. It is process drawing which shows the action | operation of the vice which concerns on this invention. It is a longitudinal cross-sectional view of the side surface which shows 2nd Embodiment of the vice which concerns on this invention. It is a figure which shows the stopper and plunger which were provided in the nut. It is a longitudinal cross-sectional view of the side surface which shows 3rd Embodiment of the vice which concerns on this invention. It is DD sectional drawing of the said FIG. 13, (a) is sectional drawing at the time of bolt fastening, (b) is sectional drawing when a bolt is loosened.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 4 show a workpiece fixing claw 1 according to the present invention. The work fixing claw 1 includes a slider 2 and a slide holder 3 that holds the slider 2. The slider 2 includes a work pressure contact portion 4 having a flat front surface 4 a and a substantially hemispherical convex portion 5 provided integrally on the rear side of the work pressure contact portion 4. The outer peripheral surface 5a of the convex portion 5 forms an arc-shaped convex surface shape, and has a taper that is inclined downward toward the workpiece press-contact portion 4 side. Further, a screw hole 6 penetrating from the upper surface to the lower surface is provided at a substantially central portion of the convex portion 5 so as to be inclined at the same angle as the taper of the outer peripheral surface 5a.

  On the other hand, a concave portion 7 into which the convex portion 5 of the slider 2 is fitted is provided on the front side of the slide holder 3. The concave portion 7 is hollowed out in a substantially semicircular shape corresponding to the shape of the convex portion 5 of the slider 2, and the inner peripheral surface 7 a forms an arcuate concave shape, and the inner peripheral surface 7 a The slider 2 is tapered downward at an inclination angle corresponding to the outer peripheral surface 5 a of the convex portion 5 of the slider 2. Further, a stepped hole 8 penetrating from the upper surface toward the lower surface is provided at a substantially central portion of the slide holder 3. The stepped hole 8 is for inserting a fastening bolt 24 when the slide holder 3 is connected to the slide female screw holder 10 as shown in FIGS. Further, as shown in FIGS. 2 and 4, the bottom surface of the slide holder 3 is provided with serrations 12 in the front-rear direction including the stepped holes 8 at the center, and smooth slide surfaces 13 are formed on both sides thereof. Further, a flank 14 is formed on the outer side of the flank. When the slide holder 3 slides on the base of a vise, which will be described later, the slide surface 13 slides on the upper surface of the base.

  As shown in FIGS. 1 and 2, the convex portion 5 of the slider 2 and the concave portion 7 of the slide holder 3 are slightly larger than the semicircular shape. That is, the arc length of the outer peripheral surface 5a of the convex portion 5 of the slider 2 and the arc length of the inner peripheral surface 7a of the concave portion 7 of the slide holder 3 are both longer than the arc length of the semicircle in plan view. As a result, since both end portions 7b of the concave portion 7 of the slide holder 3 are slightly inward, the convex portion 5 of the slider 2 cannot be fitted into the concave portion 7 of the slide holder 3 from the front side. 1, the slide holder 3 can be fitted only from above the recess 7. Since the slider 2 fitted in the concave portion 7 of the slide holder 3 has almost no backlash in the concave portion 7, the slider 2 slides obliquely up and down along the inner peripheral surface 7 a of the concave portion 7 of the slide holder 3. In addition, when the workpiece is clamped, the workpiece can be clamped in a stable posture by applying a uniform pressing force to the workpiece.

  When the work fixing claw 1 is incorporated into a vise described later, it is connected to and integrated with a slide female screw holder 10 as shown in FIGS. This slide female screw holder 10 has an upper guide portion 16 having a serration 15 corresponding to the serration 12 at the center of the lower surface of the slide holder 3 on the upper surface, and a substantially cylindrical cross section having a circular shaft guide hole 18 penetrating in the front and rear direction. And a side guide portion 17. A screw hole 19 is provided in the upper guide portion 16 at a position corresponding to the stepped hole 8 of the slide holder 3. Further, an obliquely upward projecting portion 20 is provided at the tip of the upper guide portion 16, and a bolt insertion hole 21 is provided on the same axis as the screw hole 6 of the slider 2 incorporated in the slide holder 3. It has been. Further, a pin hole 22 for accommodating a lock pin 23 described later and a sensor hole 28 for accommodating a position sensor 44 are provided at the rear end of the upper guide portion 16. By aligning the serrations 12 and 15 of the lower surface of the slide holder 3 and the upper surface of the slide female screw holder 10 with each other and screwing the bolt 24 inserted into the stepped hole 8 of the slide holder 3 into the screw hole 19 of the slide female holder 10, 3 and the slide female screw holder 10 can be connected.

  A bolt 25 as a screw member inserted from below into the bolt insertion hole 21 of the slide female screw holder 10 is screwed into the screw hole 6 provided in the slider 2 of the workpiece fixing claw 1, and the bolt 25 rotates in the left-right direction. Therefore, the slider 2 can be slid obliquely in the vertical direction. In particular, since the input direction of the bolt 25 and the sliding direction of the slider 2 substantially coincide with each other, when the workpiece is clamped by sliding the slider 2 obliquely downward, the pressure contact force of the slider 2 is effective on the lower end portion of the workpiece. Will be applied evenly and uniformly. The rotational force is transmitted to the bolt 25 through the upper bevel gear 26 provided on the head of the bolt 25. Further, when the slider 2 is slid obliquely upward, a return prevention ring 27 is provided in the middle of the bolt 25 to prevent the bolt 25 from moving downward without sliding the slider 2. Yes.

  7 to 10 show a first embodiment of a vise incorporating the workpiece fixing claw 1 described above. The vise 30 includes an elongated base 31 having a rectangular cross section, and a guide groove 32 for slidingly guiding the slide female screw holder 10 is provided in the base 31. The cross-sectional shape of the guide groove 32 substantially corresponds to the cross-sectional shape of the slide female screw holder 10, and a long groove 33 for guiding the upper guide portion 16 of the slide female screw holder 10 is provided at the center of the upper surface. A hollow portion 34 for guiding the lower guide portion 17 of the slide female screw holder 10 is provided below the long groove 33. A slide guide surface 35 is provided on the upper surface of the base 31 so as to contact the slide surface 13 on the lower surface of the slide holder 3 along both sides of the long groove 33. Further, a serration 36 is provided along the slide guide surface 35 on the outer upper surface of the slide guide surface 35.

  A driving mechanism for moving the workpiece fixing claw 1 on the base 31 and an external force applying means for sliding the slider 2 of the workpiece fixing claw 1 obliquely up and down are disposed in the hollow portion 34 of the base 31. These drive mechanisms and external force applying means include a screw shaft 37 having a thread groove on the outer peripheral surface, and a nut 38 screwed onto the screw shaft 37. The nut 38 has a cylindrical shape with front and rear collar portions 39, 40 and is inserted into the shaft guide hole 18 of the slide female screw holder 10. An internal thread is provided on the inner peripheral surface of the cylindrical body and is engaged with the screw shaft 37. Front and rear collar portions 39, 40 are engaged with the front end and the rear end of the lower guide portion 17, respectively. A lower bevel gear 41 is provided at the front end of the front collar portion 39 and meshes with the upper bevel gear 26 at the head of the bolt 25 inserted into the bolt insertion hole 21 of the slide female screw holder 10 from below. The pair of bevel gears mesh with each other at an angle θ formed by the axis 38 a of the nut 38 and the axis 25 a of the bolt 25 that is smaller than 90 degrees. On the other hand, a cut groove 42 into which the tip of the lock pin 23 is fitted is provided on the upper surface of the rear collar portion 40. The upper and lower operations of the lock pin 23 are performed by a solenoid 43, and the lock pin 23, the groove 42 and the solenoid 43 constitute a lock mechanism. A position sensor 44 that detects the position of the kerf 42 is provided in the vicinity of the lock pin 23. Further, one end 45 of the screw shaft 37 protrudes from the rear end of the base 31, and the gear portion 47 of the servo control device 46 is connected to the protruding end 45.

  Next, the operation of the vise 30 having the above configuration and the workpiece clamping will be described. As shown in FIGS. 8 and 11, when the start switch is turned on by the automatic operation mode of the servo control device 46, the drive mechanism operates and the screw shaft 37 rotates. At this time, since the tip of the lock pin 23 is engaged with and engaged with the groove 42 of the nut 38, the nut 38 and the slide female screw holder 10 are locked. As a result, the nut 38 slides forward on the screw shaft 37 without rotating. Further, the slide female screw holder 10 and the workpiece fixing claw 1 move on the base 31 together with the nut 38. It should be noted that it is desirable to attach an attachment 48 such as a peanut to the front surface 4a of the slider 2 of the workpiece fixing claw 1 during workpiece machining.

  On the base 31, a claw 49 is fixed on the opposite side across the workpiece W. When the attachment 48 of the workpiece fixing claw 1 approaches the position approaching the workpiece W, a proximity switch (not shown) is turned on, and comes closer to contact with the workpiece W to apply a predetermined torque to the screw shaft 37. A torque value is detected. When the first torque value is detected, the solenoid 43 is turned on, and the lock mechanism is released when the tip of the lock pin 23 comes out of the groove 42, so that the slide female screw holder 10 and the nut 38 become free (see FIG. 9). ).

  As shown in FIGS. 9 and 11, since the attachment 48 of the slider 2 is in contact with the workpiece W in the unlocked state, the nut 38 slides even if the screw shaft 37 rotates again in this state. The nut 38 rotates together with the screw shaft 37. Therefore, the lower bevel gear 41 at the tip of the nut rotates, and the upper bevel gear 26 on the slider 2 side meshing with the rotation rotates to transmit the rotational force to the bolt 25. Then, as the bolt 25 rotates, the slider 2 slides obliquely downward, and the clamping force is ensured by increasing the pressure contact force against the workpiece W. Then, when a predetermined torque set on the screw shaft 37 is applied, the second torque value is detected, the rotation of the screw shaft 37 is stopped, and the clamping of the workpiece W is completed. The workpiece W is processed while holding the torque value in this state. The pressing force against the workpiece W at the time of clamping is sufficiently ensured by the wedge action of the slider 2. Further, since the pressure contact force is uniformly applied from the slider 2 to the entire worm W without being partially biased, the work fixing claw 1 is effectively prevented from being lifted.

  When the work of the workpiece W is completed, the screw shaft 37 is rotated in the reverse direction. As a result, the nut 38 and the lower bevel gear 41 at the tip of the nut are rotated in reverse, and a reverse rotational force is transmitted to the bolt 25. The reverse rotation of the bolt 25 causes the slider 2 to slide obliquely upward, the pressure contact force against the workpiece W is weakened, and the clamp is released. Note that the downward movement of the bolt 25 is prevented by the return prevention ring 27. As the nut 38 rotates, the position sensor 44 installed in the vicinity of the lock pin 23 detects the position of the kerf 42, so that the solenoid 43 is turned off and the tip of the lock pin 23 becomes the kerf 42. The slide female screw holder 10 and the nut 38 are locked. When the screw shaft 37 is reversely rotated in this state, the nut 38 slides backward on the screw shaft 37 without rotating, and the work fixing claw 1 is moved backward together with the slide female screw holder 10. Then, when the operation is completed by detecting the return to the set position, the operation returns to the first automatic operation again for the next machining operation.

  12 and 13 show a second embodiment of the vice according to the present invention. The vice 50 according to this embodiment is different in that the end 51 of the screw shaft 37 protruding from the rear end of the base 31 is rotated with an impact wrench and the like, and the plunger 52 is used instead of the lock pin. Except for the above, since it has almost the same configuration as the previous vice 30, detailed description will be omitted by using the same reference numerals for the same portions and members.

  An end portion 51 of the screw shaft 37 protruding from the rear end of the base 31 has a hexagonal shape, and the screw shaft 37 can be rotated by an impact wrench, a rotary actuator, or the like. The plunger 52 is fixed to the rear end portion of the slide female screw holder 10, and the spring-biased front end portion 53 projects from the lower surface and fits into a recess 54 provided on the outer surface of the rear collar portion 40 of the nut 38. The nut 38 and the slide female screw holder 10 are locked. A stopper 55 that restricts the rotation of the nut 38 in only one direction is provided in the vicinity of the recess 54. The stopper 55 protrudes from the outer surface of the rear collar portion 40 on the side close to the depression 54, and is flush with the outer surface of the rear collar portion 40 on the side far from the depression 54. Therefore, when the nut 38 rotates in the R direction, the distal end portion 53 of the plunger 52 rides over the upper surface 56 of the stopper 55 to allow the nut 38 to rotate. On the other hand, when the nut 38 rotates in the L direction, the plunger 52 Since the upper surface 56 of 55 cannot be overcome, the rotation of the nut 38 is restricted at that position.

  Next, the operation of the vise 50 having the above configuration will be described. The workpiece W and the claw 49 arranged on the base 31 are the same as those in the above embodiment. When the end portion 51 of the screw shaft 37 is rotated in one direction with an impact wrench or the like in this state, the slide female screw holder 10 and the nut 38 are locked by the flanger 52, so that the nut is the same as in the previous embodiment. 38 slides on the screw shaft 37 with the slide female screw holder 10 and the work fixing claw 1 without rotating. Then, the slider 48 is moved until the attachment 48 attached to the front surface 4a of the slider 2 comes into contact with the workpiece W. When the screw shaft 37 is further rotated to press the attachment 48 against the workpiece W and a predetermined rotational torque is applied to the screw shaft 37, a rotational force is applied to the nut 38, and the rotational force becomes greater than the spring force of the plunger 52. When the distal end portion 53 of the plunger 52 is disengaged from the recess 54 on the outer peripheral surface of the rear collar portion 40, the nut 38 rotates together with the screw shaft 37 (refer to the flanger 52 indicated by the phantom line in FIG. 13). By rotating the nut 38, the lower bevel gear 41 at the tip of the nut and the upper bevel gear 26 at the head of the bolt 25 are rotated, and by transmitting the rotational force to the bolt 25, the slider 2 can be slid obliquely downward. The pressure contact force against can be increased and clamping can be performed reliably.

  The workpiece W is processed while maintaining this state. After completion of the work, the impact wrench is rotated in the reverse direction to rotate the screw shaft 37 in the reverse direction. At this time, the nut 38 is also rotated in reverse with the screw shaft 37, and the bolt 24 is rotated in reverse via the lower bevel gear 41 at the tip of the nut, whereby the slider 2 is slid obliquely upward to release the workpiece W from being clamped. When the nut 38 is rotated in the reverse direction (rotation in the L direction in FIG. 13), the plunger 52 is fitted into the recess 54, whereby the rotation of the nut 38 is stopped and the slide female screw holder 10 and the nut 38 are locked. Then, by further rotating the screw shaft 37 with an impact wrench, the slide female screw holder 10 and the work fixing claw 1 together with the nut 38 are retracted together on the base 31, and the process ends when the set position is returned. Even if the plunger 52 passes through the recess 54, the tip 53 of the plunger 52 hits the stopper 55 immediately after that and the rotation is restrained. As a result, the tip 53 of the plunger 52 fits into the recess 54.

  14 and 15 show a third embodiment of the vice according to the present invention. In the vice 60 according to this embodiment, an operator manually moves the workpiece fixing claw 1 on the base 31. A compression spring 61 is wound around the bolt 24 that fastens and fixes the slide holder 3 and the slide female screw holder 10 of the workpiece fixing claw 1, and the lower surface of the slide holder 3 is directly fixed to the upper surface of the base 31 by tightening the bolt 24. When the bolt 24 is loosened (see FIG. 15a), the repulsive force of the compression spring 61 creates a gap 62 between the lower surface of the slide holder 3 and the upper surface of the base 31 (see FIG. 15b), The slide female screw holder 10 and the base 31 can be moved. In order to secure the fixation of the slide holder 10, serrations 63 and 36 are provided on the opposing surfaces of the slide holder 10 and the base 31, respectively, and the stepped holes 8 of the slide holder 3 and the slide female screw holder 10 are provided. The screw holes 19 are provided with storage chambers 64 and 65 of the compression spring 61 facing each other.

  In addition, the vice 60 according to this example has a hexagonal column rotating shaft 66 as an external force applying means for sliding the slider 2 of the work fixing claw 1 obliquely in the vertical direction instead of the screw shaft 37 in the previous embodiment. It is provided. The external force applying means is substantially the same as the configuration of the vice 30 in the previous embodiment except for the rotating shaft 66, and the configuration of the entire vice is the same, and therefore, detailed description is omitted by using the same reference numerals. To do. The nut 67 in this embodiment has a shaft insertion hole 68 having a hexagonal cross section corresponding to the outer shape of the rotating shaft 66, and the slide holder 3 is fixed to the base 31 as shown in FIG. 15a. Then, the nut 67 can be rotated in accordance with the rotation of the rotating shaft 66. As shown in FIG. 15B, when the bolt 24 is loosened, the nut 67 can be slid on the rotating shaft 66 and the workpiece fixing claw 1 is moved. In addition, the slide female screw holder 10 can be moved on the base 31.

  When operating the vise 60 having the above-described configuration, first, the bolt 24 of the slide holder 3 is loosened, and the work fixing claw 1 is moved along the upper surface of the base 31. At this time, the slide female screw holder 10 and the nut 67 also move together with the slide holder 3. As shown in FIG. 14, when the attachment 48 attached to the front surface 4 a of the slider 2 is moved to a position where it abuts against the workpiece W, the bolt 24 is tightened again to fix the slide holder 3 to the base 31. Next, the end 66a of the rotating shaft 66 protruding from the rear end of the base 31 is rotated by an impact wrench or a rotary actuator. As the rotary shaft 66 rotates, the nut 67 rotates, and the lower bevel gear 41 at the tip of the nut and the upper bevel gear 26 at the bolt head rotate, whereby a rotational force is transmitted to the bolt 25. The rotation of the bolt 25 causes the slider 2 to slide obliquely downward, increasing the pressure contact force against the workpiece W, so that it can be reliably clamped by the wedge action.

  When the work of the workpiece W is completed, the rotating shaft 66 and the nut 67 are rotated in the reverse direction, and the slider 2 is slid obliquely upward by transmitting the reverse rotational force to the bolt 25 to clamp the workpiece W. Is released. Since the workpiece W can be removed from the base 31 at this time, the same operation can be repeated by placing a new workpiece on the base 31 and tightening the bolts 24. When returning the workpiece fixing claw 1 to a predetermined position, the workpiece 24 can be slid on the base 31 with the bolt 24 loosened.

  While preferred embodiments of the invention have been described above, it should be appreciated that the invention is not limited to these embodiments and that various modifications and changes can be made to these embodiments.

DESCRIPTION OF SYMBOLS 1 Work fixing claw 2 Slider 3 Slide holder 4 Work pressure contact part 4a Front surface of work pressure contact part 5 Convex part 5a Outer peripheral surface of convex part 6 Screw hole 7 Recess 7a Inner peripheral surface of concave part 7b End part 8 Stepped hole 10 Slide female screw holder 12, 15, 36, 63 Serration 13 Slide surface 14 Relief surface 16 Upper guide portion 17 Lower guide portion 18 Shaft guide hole 19 Screw hole 20 Projection portion 21 Bolt insertion hole 22 Pin hole 23 Lock pin 24 Bolt 25 Bolt 26 Upper bevel gear 27 Return prevention ring 28 Sensor hole 30, 50, 60 Vise 31 Base 32 Guide groove 33 Long groove 34 Cavity 35 Slide guide surface 37 Screw shaft 38, 67 Nut 39 Front collar 40 Rear collar 41 Lower bevel gear 42 Groove 43 Solenoid 44 Position sensor 45 End 46 Turbo controller 47 gear portion 48 attachment 49 Namatsume 51 end 52 recess plunger 53 plunger tip 54 55 stopper 56 top 61 compression spring 62 clearance 64, 65 storage chamber 66 rotary shaft 68 shaft insertion hole

Claims (13)

A workpiece fixing claw for clamping the workpiece,
A slider that presses against the workpiece,
A slide holder for holding the slider,
The slider has a substantially hemispherical convex part, and the outer peripheral surface of the convex part has an arcuate convex shape and is tapered downward.
On the other hand, a concave portion into which the convex portion of the slider is fitted is provided on the front side of the slide holder, and the concave portion is formed in a substantially semicircular shape corresponding to the shape of the convex portion of the slider. Has an arcuate concave shape, and the inner peripheral surface is tapered downward at an angle corresponding to the outer peripheral surface of the convex portion of the slider,
The slider is a work fixing claw that slides obliquely up and down along the inner peripheral surface of the concave portion of the slide holder.   The work fixing claw according to claim 1, wherein a length of an arc of an inner peripheral surface of the concave portion of the slide holder is equal to or longer than a semicircular arc.   2. The work fixing claw according to claim 1, wherein the slider has a screw hole penetrating the upper and lower surfaces at substantially the same inclination angle as the taper attached to the outer peripheral surface of the convex portion.   The work fixing claw according to claim 3, wherein a screw member is screwed into a screw hole of the slider, and the slider is slid vertically by rotating the screw member. The work fixing claw according to any one of claims 1 to 4,
A vise provided with an external force applying means for sliding the workpiece fixing claw slider obliquely up and down. The work fixing claw according to any one of claims 1 to 4,
A drive mechanism for moving the workpiece fixing claw on the base;
A lock mechanism for connecting and releasing the workpiece fixing claw and the drive mechanism;
An external force applying means for sliding the workpiece fixing claw slider diagonally up and down,
When the work fixing claw and the drive mechanism are connected by the lock mechanism, the work fixing claw is moved on the base by the operation of the drive mechanism, and when the work fixing claw and the drive mechanism are released, the external force applying means is operated. A vise where the slider slides diagonally up and down. The drive mechanism includes a screw shaft having a thread groove on an outer peripheral surface, and a nut that is screwed onto the screw shaft.
The nut moves together with the workpiece fixing claw when the workpiece fixing claw and the driving mechanism are connected by the lock mechanism, and rotates together with the screw shaft when the locking mechanism is released. The vice described in.   The vise according to claim 6 or 7, wherein the lock mechanism is released when a predetermined torque is generated in the drive mechanism.   The vise according to claim 5 or 6, wherein the external force applying means includes a rotating shaft that rotates by an external force, and a rotating force transmitting means that transmits the rotating force of the rotating shaft to a screw member screwed into a screw hole of the slider. .   The vise according to claim 9, wherein the rotational force transmitting means includes a pair of bevel gears provided between a rotating shaft and a screw member.   The vise according to claim 10, wherein the pair of bevel gears mesh with each other at an angle between the rotation shaft and the screw member that is smaller than 90 degrees. A work clamping method using the vice according to any one of claims 6 to 10,
When the workpiece fixing claw moves on the base integrally with the nut of the driving mechanism by the operation of the driving mechanism, and comes into contact with the workpiece arranged on the base and the screw shaft of the driving mechanism generates a predetermined torque, the locking mechanism is A workpiece clamping method in which a workpiece is clamped by transmitting a rotational force to a screw member disposed on the slider by rotating a nut together with the screw shaft, and sliding the slider obliquely downward. The work clamping method according to claim 12, wherein the operation of the drive mechanism is controlled by a servo motor, the screw shaft of the drive device detects that a predetermined torque is generated, and the lock mechanism is released based on the detection signal.

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