JP4786348B2 - Vise with booster - Google Patents

Description

  The present invention relates to a vise with an intensifier, and more specifically, a movable jaw that is restricted in rotation by the main body frame and moves in the axial direction of the screw shaft by the rotation of the screw shaft that engages is provided via the screw shaft. The present invention relates to a technique for adjusting a tightening force of a work sandwiched between a fixed jaw and a movable jaw by adjusting a pressing force applied to a screw shaft of the power increasing device in a vise having a power increasing device that presses the power.

  There is a vise equipped with a booster, and a strong work clamping force can be obtained. In the gazette of Patent Document 1, a mechanical booster is provided in a vise, and the booster is disposed on one end side of a screw shaft, and is supported by a main body frame so as to be rotatable and immovable in an axial direction. The hollow shaft is surrounded by a hollow shaft that is engaged with the screw shaft so as not to rotate relative to the screw shaft and to move in the axial direction. The booster device has a conical screw shaft side end portion, an operating shaft extending in the axial direction, a through-hole through which the operating shaft is inserted, and a hollow shaft in a state where relative movement in the axial direction is restricted. And two rollers arranged symmetrically with respect to the axis of the operating shaft and in contact with the conical screw shaft side end, one end of the screw shaft and the operating shaft A roller accommodating space is formed between the support member and the support member. The length of the roller accommodating space in the axial direction is shorter as it is farther from the axis, that is, the outer side. The screw shaft is engaged with the hollow shaft so as not to rotate relative to the hollow shaft and relatively movable in the axial direction, and rotation of the rotary propulsion shaft rotated by a handle or a motor is transmitted to the hollow shaft via the clutch device, The screw shaft engaged with the hollow shaft so as not to rotate relatively rotates. As the screw shaft rotates, it moves in the axial direction along the sliding guide surface of the main body frame, and the movable jaw moves toward the fixed jaw. When clamping of the workpiece is started between the fixed jaw and the movable jaw and the workpiece clamping force increases to some extent, the force required to further rotate the screw shaft to obtain sufficient clamping force Exceeds ability to transmit rotation to shaft. That is, the rotation transmission of the clutch device is released. Therefore, the hollow shaft does not rotate with the rotation of the rotary propulsion shaft, that is, only the rotary propulsion shaft rotates. Therefore, the rotation propulsion shaft rotates relative to the hollow shaft as the hollow shaft stops rotating, but the hollow shaft is restricted from moving in the axial direction by the main body frame and is screw-engaged with the rotation propulsion shaft. The rotation propulsion shaft moves in the axial direction and presses the operating shaft of the booster. The operating shaft presses one end of the screw shaft through four rollers with a force that increases the pressing force of the rotary propulsion shaft driven by a handle or the like by a wedge action. As the driving torque of the handle or the like for driving the rotary propulsion shaft increases and the operating shaft moves in the axial direction toward one end of the screw shaft, each roller moves in the roller housing space radially outward. As described above, the axial length of the roller accommodating space is shorter toward the outer side in the radial direction, so that the radially outer portion of the roller accommodating space accommodates the roller, that is, the movement of the roller toward the outer side in the radial direction. In order to allow the screw shaft, one end of the screw shaft needs to move in the axial direction toward the counter-acting shaft, and the movable jaw that moves and engages the screw shaft moves toward the fixed jaw. . Accordingly, the driving torque of the handle and the like is increased, the pressing force of the rotary propulsion shaft is increased, and the operating shaft of the booster is moved in the direction approaching the screw shaft with respect to the hollow shaft, that is, the main body frame. The stronger the workpiece tightening force is, the more it can be obtained.

  In the gazette of Patent Document 2, a hydraulic booster is provided in a vise, and the booster is disposed on one end side of a screw shaft, and is surrounded by a hollow shaft similar to a mechanical booster. Yes. The booster includes an operating shaft extending in the axial direction, and an operating shaft support member supported by the hollow shaft in a state in which the relative movement in the axial direction is restricted while having a through hole through which the operating shaft is inserted. A hydraulic chamber filled with the working fluid is formed between one end of the screw shaft and the working shaft support member. When clamping of the workpiece is started by the fixed jaw and the movable jaw and the workpiece clamping force increases to some extent, the rotation transmission of the clutch device is released, and the rotation propulsion shaft moves in the axial direction as in the mechanical booster. To press the operating shaft of the booster. In the hydraulic chamber, one end of the screw shaft has a much larger cross-sectional area than the operating shaft, so a force much larger than the force driven by the handle etc. and the rotary propelling shaft pressing the operating shaft is And one end of the screw shaft is pressed. Therefore, the movable jaw that engages with the screw shaft by moving the screw shaft moves toward the fixed jaw. Therefore, as with the mechanical booster, the driving torque of the handle or the like increases, and the stronger the workpiece tightening force is, the more the operating shaft of the booster moves in the direction closer to the screw shaft. it can.

  The workpiece needs to be held on the vise with an appropriate tightening force. For example, when a workpiece made of a material having low rigidity such as a thin member, aluminum, or plastic is processed, the workpiece is deformed by an excessive tightening force. Returning to the end of processing by elastic deformation, the processing accuracy is impaired, or the product is deformed plastically and the quality is impaired. On the other hand, if the tightening force is excessively small, the workpiece may be displaced due to the machining force, resulting in machining failure or in some cases damage to the tool. In order to adjust the tightening force and hold the workpiece with an appropriate tightening force, in the gazette of Patent Document 1, a tightening force adjusting device is provided in a vise equipped with a mechanical booster.

The hollow shaft is constituted by a screw shaft side hollow shaft and an anti-screw shaft side hollow shaft that are separated from each other, and the screw shaft side hollow shaft is screw-engaged with the rotation propulsion shaft and is not rotatable relative to one end of the screw shaft. It is engaged so as to be relatively movable in the axial direction, and the anti-screw shaft side hollow shaft is connected to the rotation propulsion shaft via a clutch device, and the rotation of the rotation propulsion shaft is counteracted via the clutch device. It is transmitted to the screw shaft side hollow shaft. The screw shaft side hollow shaft and the counter screw shaft side hollow shaft are engaged with each other by a guide pin provided on an end surface of the screw shaft side hollow shaft and extending in the axial direction so as not to be relatively rotatable and relatively movable in the axial direction. Yes. A stopper ring having a protruding portion protruding in the screw shaft direction is provided between the hollow shafts, and is engaged with the hollow shafts so as not to rotate relative to each other by the guide pins. An adjustment ring is provided on the anti-screw shaft side hollow shaft, and the adjustment ring is held so as to be disengaged from the anti-screw shaft side hollow shaft. The stopper ring is provided with a male screw on the outer peripheral surface, and is engaged with a female screw provided on the adjustment ring. The stopper ring is restricted from moving in the axial direction with the non-screw shaft side hollow shaft via the adjustment ring. Has been. In addition, a step portion is formed at an intermediate portion of the rotation propulsion shaft, and a rotation propulsion member having a protruding portion protruding in the screw shaft direction is provided on the screw shaft side end surface of the step portion. The protrusion of the rotation propulsion member engages with the protrusion of the stopper ring as the rotation propulsion shaft rotates and moves in the axial direction after the rotation transmission of the clutch device is released. Thereby, the rotation propulsion shaft cannot be rotated relative to the screw shaft side hollow shaft. A large clamping force has already been applied to the workpiece by the pressing of the boosting device along with the advancement of the rotary propulsion shaft, so the frictional force with the main body frame generated by a large reaction force from the workpiece, The screw shaft side hollow shaft is restricted from rotating. Accordingly, the rotation propulsion shaft is stopped from being rotated by the handle or the like, and the work is held with a predetermined tightening force. The work clamping force is adjusted by releasing the engagement between the adjustment ring and the non-screw shaft side hollow shaft, and rotating the adjustment ring to move the stopper ring in the axial direction. That is, the tightening force is reduced by bringing the stopper ring closer to the rotation propelling member, and the tightening force is increased by separating the stopper ring.
JP-B 63-53413 JP-B 63-41711 JP 2004-255555 A

  However, in the device of Patent Document 3, the stopper ring is locked by a guide pin provided on the end surface of the screw shaft side hollow shaft, and the protruding portion of the stopper ring, the protruding portion of the rotation propulsion member, and the guide pin Is located on the inner side in the radial direction than the outer peripheral surfaces of both hollow shafts. When the rotation of the rotation propulsion shaft is restricted and stopped, and the workpiece is held with a predetermined tightening force, that is, the rotation propulsion shaft moves in the axial direction while rotating, both the stopper ring and the rotation propulsion member At the moment when the protrusions engage with each other, an impact force is applied to both protrusions and the guide pin. Both projecting portions and guide pins are located on the inner side of the outer peripheral surfaces of both the hollow shafts and are close to the center of rotation, so that a large impact force is applied. Therefore, the stopper ring, the rotation propulsion member, and the guide pin that is a locking member of the stopper ring by restricting the relative rotation between the hollow shaft and the stopper ring are damaged or deformed, or are worn at an early stage and lose their functions.

  In view of the above-described problems of the prior art, an object of the present invention is to tighten a smaller impact force applied to a component when a rotary propulsion shaft rotated by a handle or the like is restrained in a vise with a booster. It is to provide a force adjusting device.

  The present invention has been made to achieve the above object, and includes a screw shaft that moves the movable jaw in the axial direction, and is provided on one end side of the screw shaft so as to press the screw shaft and move it toward the anti-screw shaft side. A booster having an actuation shaft, a rotary propulsion shaft adjacent to the actuation shaft of the booster, and a hollow shaft rotatably supported by the main body frame and immovable in the axial direction of the screw shaft, Encloses the booster, one end engages with the screw shaft so as not to rotate relative to the screw shaft and can move relative to the axial direction, the other end engages with the rotation propulsion shaft, and the rotation propulsion shaft rotates. The rotation propulsion shaft is rotated relative to the hollow shaft in response to the release of rotation transmission of the clutch device and exerts a pressing force corresponding to the screw force on the operating shaft. Projection that projects in the screw axis direction And a hollow shaft is inserted, and at least when the rotation transmission of the clutch device is released, a stopper ring that cannot rotate relative to the main body frame, and a screw shaft on the side surface of the screw shaft fixed to the screw shaft side end of the rotation propulsion shaft And a rotation propulsion member having a protrusion that can be engaged with the protrusion of the stopper ring as the rotation propulsion shaft rotates and moves in the axial direction. The relative position in the axial direction with respect to the frame is adjusted (Claim 1).

  Further, the stopper ring is not rotatable relative to the main body frame via a locking member that protrudes from the outer peripheral surface of the hollow shaft and restricts relative rotation between the stopper ring and the hollow shaft.

  Further, a positioning mechanism for restricting the axial position of the stopper ring is provided so that the outer peripheral surface of the stopper ring and the inner peripheral surface of the main body frame are opposed to each other, and the positioning mechanism is recessed in one of the outer peripheral surface and the inner peripheral surface. And a convex portion on the other side, and one of the concave portion and the convex portion is provided in the axial direction, and the other is provided so as to be movable toward the one and selectively engage with one of them. Thus, the relative position of the stopper ring in the axial direction with respect to the main body frame is adjusted (Claim 3).

  Further, the other of the concave portion and the convex portion is elastically biased toward one side and can be engaged with one side (Claim 4).

  In addition, a plurality of recesses are disposed in the axial direction on the outer peripheral surface of the stopper ring, and a recess is formed in the main body frame, and an engaging member is inserted, whereby a convex portion is provided on the main body frame. The combined member is elastically biased toward the recess and can be engaged with the recess.

  Furthermore, the stopper ring has an anti-screw shaft side annular portion that extends in the axial direction and is exposed from the anti-screw shaft side of the main body frame, and the rotation propulsion member has a screw shaft that extends in the axial direction toward the screw shaft side. It has a side annular portion, and the screw shaft side annular portion is inserted into the counter screw shaft side annular portion and has the protruding portion (Claim 6).

  Furthermore, a circumferential groove is provided on the outer peripheral surface of the screw shaft side annular portion of the rotation propulsion member.

  Further, a plurality of the circumferential grooves are provided, and are respectively arranged corresponding to one of a plurality of concave portions and convex portions arranged in the axial direction (claim 8).

  The rotary shaft is rotated by a handle or the like and the hollow shaft is rotated via the clutch device. The screw shaft is rotated by the rotation of the hollow shaft, and the movable jaw moves in the axial direction of the screw shaft toward the fixed jaw. Tightening starts. When the tightening force increases and the rotational resistance of the hollow shaft increases and exceeds the rotation transmission capability of the clutch device, the rotation transmission of the clutch device is released. The rotation propulsion shaft rotates in the axial direction of the screw shaft relative to the hollow shaft when the rotation transmission of the clutch device is released, and increases the pressing force corresponding to the screw force generated by the screw engagement with the hollow shaft. The effect on the operating axis. According to the first aspect, the rotation propulsion shaft is provided with the rotation propulsion member that can be engaged with the stopper ring as it moves in the axial direction while being rotated, and the stopper ring is not rotatable relative to the main body frame. Therefore, the rotation propulsion shaft is restrained from rotating by the handle or the like by the stopper ring, and the work is held by a tightening force corresponding to the relative position of the stopper ring with the main body frame in the axial direction. Since the stopper ring can be adjusted with respect to the main body frame in the axial direction, the workpiece is held in the vise with a desired tightening force. Furthermore, since the stopper ring is inserted through the hollow shaft, the protruding portion of the stopper ring and the protruding portion of the rotary propelling member are located radially outward from the outer peripheral surface of the hollow shaft and are separated from the rotation center of the rotary propelling shaft. Therefore, the impact force at the moment when both protruding portions are engaged with each other, that is, the impact force applied when the rotation of the rotary propulsion shaft is stopped is small. Therefore, the tightening force adjusting device can suppress the stopper ring and the rotation propelling member from being damaged, deformed or worn by the impact force.

  When the tightening force of the workpiece is increased, the hollow shaft is released from the rotation transmission of the clutch device and is not rotated by the rotation propulsion shaft, and cannot be rotated relative to the main body frame. The state in which relative rotation is impossible is maintained by the frictional force generated by pressing the hollow shaft and the main body frame in the axial direction due to an increase in the reaction force against the tightening force due to an increase in the work clamping force. As the applied force increases, the frictional force increases and becomes firmer. According to the second aspect, the locking member protruding from the outer peripheral surface of the hollow shaft is provided, and the member restricts the relative rotation between the stopper ring and the hollow shaft. Specifically, the locking member is supported by one of the radially outer portion of the hollow shaft and the radially inner portion of the stopper ring, and is inserted through an axial groove provided on the other. The stopper ring becomes non-rotatable relative to the main body frame via the hollow shaft that is not rotatable relative to the main body frame, and stops the rotation of the rotation propulsion shaft. Accordingly, the stopper ring and the hollow shaft do not adopt a method in which the relative rotation is regulated through the locking member, and the relative rotation is regulated as a flat surface in which a part or all of the circumferential surface is in contact with each other. A circular cross section can be taken, and manufacture becomes easy. As described above, the hollow shaft cannot rotate relative to the main body frame due to a frictional force, and therefore can be rotated against the frictional force when stopping the rotation of the rotary propulsion shaft via the stopper ring. Therefore, the impact force applied to the stopper ring, the rotation propelling member, and the locking member is alleviated, and damage and deformation are suppressed. In addition, the stopper ring rotates integrally with the rotation propelling member until the relative position in the axial direction with the main body frame is adjusted via the hollow shaft and the rotation transmission of the clutch device is released. Therefore, even if the rotation phase of the hollow shaft with respect to the main body frame differs when the rotation transmission of the clutch device is canceled due to the difference in the size of the workpiece, both protruding portions of the stopper ring and the rotation propulsion member are released after the rotation transmission of the clutch device is canceled. The amount of rotation of the rotary propulsion shaft until the two engage with each other, that is, the amount of movement of the operating shaft of the booster becomes substantially constant, so that a predetermined work clamping force can be obtained accurately.

  According to the third aspect of the present invention, the stopper ring can be positioned at a plurality of positions in the axial direction with respect to the main body frame, corresponding to one of the concave and convex portions arranged in the axial direction. Therefore, the tightening force adjusting device has high reproducibility of the tightening force, and can easily obtain an accurate tightening force even when the workpiece is changed and the tightening force needs to be changed.

  According to claim 4, when the force is applied, the other of the concave portion and the convex portion moves against the biasing force to be disengaged from the other, and when the force is removed, the other moves by the biasing force. Since the engagement with the one is resumed, there is no need to move it with a tool such as a spanner for the engagement with one and the disengagement with the one, and the workpiece can be easily and quickly performed. The tightening force can be adjusted.

  According to the fifth aspect, the engaging member does not require a special shape, and an inexpensive member such as a steel ball or a conical member can be used.

  According to the sixth aspect of the present invention, the hollow shaft and the rotary propulsion shaft are surrounded by the two annular portions, and intrusion of cutting powder, cutting fluid and the like is suppressed. Furthermore, the stopper ring can be moved by touching the annular portion on the anti-screw shaft side by hand, and the work clamping force can be easily adjusted.

  According to the seventh aspect, the axial direction of the stopper ring relative to the main body frame is determined by the positional relationship between the predetermined portion of the anti-screw shaft side annular portion of the stopper ring, for example, the end of the anti-screw shaft side annular portion, and the circumferential groove. The position can be known, and the adjustment of the tightening force can be confirmed. Further, as the tightening force increases, the positional relationship in the axial direction between the predetermined portion of the annular portion on the anti-screw shaft side and the circumferential groove changes, so that the tightening force can be reduced by observing the change in the positional relationship. Before reaching the predetermined value, the rotational speed of the rotary propulsion shaft by the handle or the like can be reduced. Accordingly, the work can be quickly held and the impact force can be reduced, so that the stopper ring, the rotation propelling member, and the stopper ring locking member can be prevented from being damaged or deformed.

  According to the eighth aspect of the present invention, if the axial positional relationship between the predetermined portion, for example, the end portion of the annular portion of the stopper ring on the side opposite to the screw shaft and the circumferential groove corresponding to the tightening force is matched, for example, Even if the applied force is changed, it is possible to easily confirm the adjustment of the tightening force. Accordingly, the risk of erroneous adjustment to an undesired tightening force is eliminated.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 7 show a vice 100 according to a first embodiment of the present invention. FIGS. 1 to 3 are sectional views showing the entire vice 100. FIG. 1 shows a state in which the work 2 is placed between the fixed jaw 5 and the movable jaw 6, and before the work holding operation is started. Shows the state. In FIG. 2, the work holding operation is started, the rotation of the rotary propulsion shaft 15 is transmitted to the hollow shaft 14 via the clutch device 70, the screw shaft 10 is rotated, and the work 2 is sandwiched between the jaws 5 and 6. Indicates the state where has started. FIG. 3 shows a state in which the rotation propulsion shaft 15 is further rotated after the rotation transmission of the clutch device 70 is released, and the workpiece 2 is held with a predetermined tightening force. FIG. 4 is an enlarged view of a main part of FIG. FIG. 5 is an external view of the inner member in the radial direction of the axis 10a of the screw shaft 10 with respect to FIG. FIG. 6 is an enlarged view of a main part of FIG. FIG. 7 is an external view of the inner member in the radial direction of the axis 10a of the screw shaft 10 with respect to FIG.

  The vise 100 of the present embodiment is integrated with the main body frame 3a via the main body frame 3a fixed to the table 1 of the machine tool and the hexagon socket bolt 29, and constitutes the main body frame 3 together with the main body frame 3a. 3b, a screw shaft 10 and an end shaft 11 connected to one end of the screw shaft 10 via a pin 12 and integrated with the screw shaft 10 to form one end of the screw shaft 10, and a key 7 on the main body frame 3a. The fixed jaw 5 fixed via the screw shaft 10 is engaged with the screw shaft 10, that is, has a female screw and is screwed with the screw shaft 10, and the axial direction of the screw shaft 10 is guided by a guide groove (not shown) of the main body frame 3 a. A nut 9 that is guided to be movable and non-rotatable, a movable jaw 6 that is fixed to the nut 9 via a key 8 and faces the fixed jaw 5, and a booster that is disposed adjacent to the end shaft 11. , The rotary propulsion shaft 15 disposed adjacent to the end of the actuating shaft 16 of the power increasing device 80 on the side opposite to the screw shaft, the screw shaft 10 surrounding the power increasing device 80 and being relatively unrotatable. A hollow shaft 14 which is engaged with the nut 20 by a hexagon socket head bolt 35 and is engaged with the rotary propulsion shaft 15 via the nut 20, and a rotary propulsion shaft. And a clutch device 70 that transmits 15 rotations to the hollow shaft 14.

  The intensifier 80 has a conical screw shaft side end portion 16a and has an operating shaft 16 extending in the axial direction, a through hole through which the operating shaft 16 is inserted, and is engaged with a step portion of the hollow shaft 14. An operating shaft support member 19 fitted to the hollow shaft 14 in a state in which the movement to the opposite screw shaft side in the axial direction is restricted, and one large and one small relative to the axis of the operating shaft 16 Four rollers 17 and 18 that are arranged symmetrically with each other and are in contact with the screw shaft side end portion 16 a are provided, and a roller receiving space is formed between the end shaft 11 and the operating shaft support member 19. The small-diameter portion of the screw shaft side end surface 19a of the operating shaft support member 19 is closer to the end shaft 11 toward the outer side in the radial direction, and the roller accommodating space becomes smaller toward the outer side in the radial direction.

  The clutch device 70 includes a clutch ring 21 and a compression coil spring 23 that are engaged with the rotary propelling shaft 15 so as not to rotate relative to the rotation propulsion shaft 15 and to be relatively movable in the axial direction. In the present embodiment, the clutch ring 21 is engaged with the rotary propulsion shaft 15 via the key 22 so as not to rotate relative to the rotary propulsion shaft and to be relatively movable in the axial direction. A shaft may be used, and the inner peripheral surface of the clutch ring 21 may be a polygonal hole, for example, a square hole, so that the rotary propulsion shaft 15 may be directly engaged. The compression coil spring 23 is interposed between the bearing holder 24 fixed to the screw shaft side end portion of the rotary propulsion shaft 15 via a hexagon socket bolt 28 and the flange portion of the clutch ring 21, so that the clutch ring 21. Is urged toward the opposite screw shaft. The clutch ring 21 has a plurality of engagement protrusions extending in the radial direction on the side of the anti-screw shaft of the flange portion, and the engagement protrusions are formed on the side of the screw shaft of the nut 20 and extend in the radial direction. By engaging a plurality of existing engagement grooves with the pressing force of the compression coil spring 23, the rotation of the rotation propulsion shaft 15 is transmitted to the hollow shaft 14.

  The hollow shaft 14 is inserted into the main body frame 3b and is rotatably supported, and has a step portion protruding in the radial direction at an intermediate portion, and each end surface of the step portion has a step portion of the main body frame 3b. By engaging the stepped portion provided on the inner peripheral surface and the retaining ring 31 with the thrust metal 33 and the O-ring holder 32 interposed therebetween, the relative movement in the axial direction with the main body frame 3 is restricted. The hollow shaft 14 is provided with a female screw on the inner peripheral surface of the end portion on the screw shaft side, and a hexagonal through-hole bolt 13 having a hexagonal screw shaft engaging hole 13a is screwed thereto. A plurality of disc springs 27 are arranged between the flange portion of the hexagonal through-hole bolt 13 and the flange portion of the end shaft 11, and bias the end shaft 11 toward the roller 17. The biasing force of the disc spring 27 is adjusted by changing the screwing amount of the hexagonal through-hole bolt 13 into the hollow shaft 14, and after the adjustment, the axial groove formed on the outer peripheral surface of the hexagonal through-hole bolt 13 By engaging the front end portion of the hexagon socket head cap screw 36, the relative rotation with respect to the hollow shaft 14 of the hexagon socket head cap bolt 13 is restricted, and the screwing amount is maintained. Abut.

  One end of the screw shaft 10 that engages with the hollow shaft 14 has an engaging end portion 10b having a hexagonal outer peripheral surface, and is fixed by being screwed into the end shaft 11 and a fitting hole through which the end shaft 11 is inserted. And a fitting hole into which the pin 12 protruding from the end shaft 11 is inserted. After the amount of screwing of the hexagonal through hole bolt 13 is adjusted so that the end shaft 11 is always in contact with the roller 17, the screw shaft 10 is inserted into the hexagonal through hole bolt 13. In addition, the end shaft 11 and the pin 12 are inserted through the two fitting holes, respectively. As a result, the screw shaft 10 and the hollow shaft 14 are engaged with each other so as not to be relatively rotatable and relatively movable in the axial direction, and the screw shaft 10 and the end shaft 11 are firmly integrated.

  The vise 100 further includes a tightening force adjusting device 110, which is fitted to the outer peripheral surface of the hollow shaft 14, that is, the stopper ring 40 through which the hollow shaft 14 is inserted, and the axis line. A key 48 extending in the direction and fixed to the hollow shaft 14 and projecting from the outer peripheral surface of the hollow shaft 14, and fixed to the end of the anti-screw shaft of the rotary propulsion shaft 15 via a hexagon socket bolt 34. And a rotation propelling member 41 having a screw shaft side annular portion 41a extending to the inner surface of the stopper ring 40. A key groove for guiding the key 48 in the axial direction is formed on the inner peripheral surface of the stopper ring 40.

  The stopper ring 40 has a protruding portion 40b that protrudes in the screw shaft direction, that is, in the axial direction, on the anti-screw shaft side surface 40a. Further, the rotation propelling member 41 is rotatably supported by a needle bearing 26 provided on the outer peripheral surface of the hollow shaft 14 while the screw shaft side annular portion 41 a is fitted to the outer peripheral surface of the hollow shaft 14. Further, the rotation propelling member 41 has a protruding portion 41c protruding in the axial direction on the screw shaft side surface 41b of the screw shaft side annular portion 41a. The protrusions 40b and 41c both extend in the radial direction. As shown in FIG. 4, the engagement surfaces 40c and 41d orthogonal to the anti-screw shaft side surface 40a and the screw shaft side surface 41b, respectively, and the engagement surface 40c and 41d and inclined surfaces 40d and 41e respectively intersecting at an acute angle. Both engagement surfaces 40c and 41d are provided so as to be able to face each other in the normal rotation direction of the rotary propulsion shaft 15, that is, in the rotation direction of the rotary propulsion shaft 15 in the direction in which the tightening force of the workpiece 2 is increased. As will be described later, the rotation propulsion member 41 is moved by the rotation of the rotation propulsion shaft 15 and the axial movement accompanying the rotation, and both engagement surfaces 40c and 41d are engaged with each other as shown in FIG.

  The stopper ring 40 may not be relatively movable in the axial direction with respect to the hollow shaft 14 using a push screw or the like after the axial position is adjusted. However, the tightening force adjusting device 110 of this embodiment further includes a stopper. A positioning mechanism 111 that regulates the axial position of the ring 40 is provided.

  The positioning mechanism 111 includes an adjustment ring 42, a pin 47 provided on the adjustment ring 42, a steel ball 43, and a pin 46 provided on the main body frame 3b.

  The pin 46 provided on the main body frame 3b extends in the radial direction and engages with a groove 42b provided on the outer peripheral surface of the adjustment ring 42 and extending in the axial direction. The steel ball 43 is inserted into a screw hole provided in the main body frame 3b with a predetermined phase difference from the pin 46, specifically, with a predetermined phase difference centered on the axis 10a, and with a phase difference of 180 ° in this embodiment. Then, it is elastically urged radially inward by the compression coil spring 44, and the urging force is adjusted by adjusting the screwing amount of the hexagon socket head bolt 45. The adjustment ring 42 is fitted to the outer peripheral surface of the stopper ring 40 and the inner peripheral surface of the main body frame 3b, and extends in the axial direction so that the anti-screw shaft side annular portion 42a is connected to the main body frame 3b and the stopper ring 40. And the outer peripheral surface of the screw shaft side annular portion 41a of the rotation propelling member 41 is inserted. In addition to the groove 42b, the outer peripheral surface of the adjustment ring 42 has a predetermined phase difference from the groove 42b, that is, the same phase difference as the phase difference between the pin 46 and the screw hole in the main body frame 3b. A conical hole 42c is formed by the phase difference, and four conical holes 42c are arranged in parallel in the axial direction. Thereby, the conical hole 42c and the steel ball 43 urged by the compression coil spring 44 form a concave portion and a convex portion, respectively, and engage with each other. The pin 47 provided on the adjustment ring 42 extends in the radial direction and engages with a circumferential groove 40 e provided on the outer peripheral surface of the stopper ring 40. As a result, the stopper ring 40 and the adjustment ring 42 engage with each other so as to be capable of relative rotation and impermissible relative movement in the axial direction. Therefore, the stopper ring 40 and the adjustment ring 42 are stopper rings of a type constituted by two members capable of relative rotation, and constitute the stopper ring described in the claims.

  Next, the work of holding the workpiece 2 in the vice 100 will be described. As shown in FIG. 1, the work propulsion shaft 15 is rotated by a handle (not shown) mounted on a work piece 2 between a fixed jaw 5 and a movable jaw 6 and attached to a hexagonal handle engaging hole 15a. . The rotation of the rotary propulsion shaft 15 is transmitted to the hollow shaft 14 via the clutch device 70 and is engaged with the hollow shaft 14 through the hexagonal through-hole bolt 13 fixed to the hollow shaft 14 so as to be relatively non-rotatable. 10 is rotated. As the screw shaft 10 rotates, the nut 9 screw-engaged with the screw shaft 10 moves in the axial direction, and the movable jaw 6 fixed to the nut 9 moves with the slide cover 4, as shown in FIG. Then, clamping of the work 2 is started.

  When the tightening force of the workpiece 2 gradually increases and the rotational force of the screw shaft 10 required to move the movable jaw 6 further, that is, the rotational resistance of the hollow shaft 14 exceeds the rotational transmission force of the clutch device 70, the clutch ring The engagement protrusion 21 slides out of the engagement groove of the nut 20 and escapes. That is, the rotation transmission of the clutch device 70 is released, and the hollow shaft 14 and the screw shaft 10 are not rotated. When the rotation transmission of the clutch device 70 is released, only the rotation propulsion shaft 15 rotates, and the rotation propulsion shaft 15 moves relative to the hollow shaft 14 in the axial direction. A bearing holder 25 is fitted to an end of the working shaft 16 adjacent to the rotation propulsion shaft 15 on the side opposite to the screw shaft, and a bearing holder 24 fixed to the end of the rotation propulsion shaft 15 on the screw shaft side is provided. The operating shaft 16 is pressed toward the screw shaft through the thrust bearing 30 and the bearing holder 25. The pressing force applied to the operating shaft 16 is increased by the wedge action of the conical screw shaft side end portion 16a and is fixed to one end of the screw shaft 10 via the four rollers 17 and 18. 11 is pressed. The screw shaft 10 is pressed in the axial direction, and presses the movable jaw 6 in the direction of the fixed jaw 5 via a nut 9 engaged with the screw.

  As the pressing force of the rotary propulsion shaft 15 rotated by the handle increases, the operating shaft 16 moves to the screw shaft side, and the four rollers 17 and 18 move radially outward. Since the roller accommodating space formed between the end shaft 11 and the operating shaft support member 19 becomes smaller toward the outer side in the radial direction, the end shaft is moved along with the movement of the four rollers 17 and 18 toward the outer side in the radial direction. 11 is moved in the axial direction, and the workpiece 2 is held by the vice 100 with a larger tightening force.

  As the rotary propelling shaft 15 moves in the axial direction, the rotary propelling member 41 moves in the axial direction, and as shown in FIGS. 6 and 7 which are enlarged views of the main part of FIGS. The protrusion 41c provided on the screw shaft side surface 41b of 41a is engaged with the protrusion 40b provided on the anti-screw shaft side surface 40a of the stopper ring 40 and the engagement surfaces 40c and 41d. 15 becomes non-rotatable. That is, the stopper ring 40 is restricted from rotating relative to the hollow shaft 14 by a key 48 provided as a locking member. The hollow shaft 14 is screwed with the screw shaft 10 as the workpiece 2 is pressed. 10, the frame body 3 b is pressed in the anti-screw axial direction via the thrust metal 33 by the reaction force generated from the workpiece 2. By this pressing, a frictional force is generated between the hollow shaft 14 and the frame main body 3b. The frictional force increases as the pressing force increases, that is, the tightening force of the workpiece 2 increases. Relative rotation with 3b is prevented. When the rotation propulsion shaft 15 moves and the engagement surfaces 40c and 41d are engaged with each other, the clamping force of the work 2 reaches a predetermined value, so that the hollow shaft 14 can be connected to the frame body 3b with sufficient frictional force. Relative rotation is prevented. As a result, the rotation propulsion shaft 15 becomes difficult to rotate with the handle and is stopped.

  Adjustment of the tightening force of the workpiece 2 is performed by sliding the adjustment ring 42 in the axial direction. Since the steel ball 43 is elastically biased by the compression coil spring 44, when the adjustment ring 42 is moved in the axial direction, the steel ball 43 can be moved radially outward against the biasing force. Along with this, the engagement with the conical hole 42c is released, and the conical hole 42c is engaged with another conical hole 42c that obtains a predetermined tightening force. The adjustment ring 42 is such that the pin 46 of the main body frame 3b engages with the groove 42b and the relative rotation with the main body frame 3b is restricted, and the conical hole 42c and the steel ball 43 are reliably engaged. In addition, a knurling is provided on the outer peripheral surface of the flange portion 42d of the anti-screw shaft side annular portion 42a, so that the adjustment ring 42 can be easily slid without a hand slipping.

  As the adjustment ring 42 moves, the pin 47 provided on the adjustment ring 42 moves in the axial direction, and the stopper ring 40 engaged with the pin 47 via the circumferential groove 40e also moves in the axial direction. Moving. Thereby, the protrusion part 40b of the stopper ring 40 approaches or separates in the axial direction from the protrusion part 41c of the screw shaft side annular part 41a of the rotation propulsion member 41. As shown in FIG. 8, when the protrusion 40b is adjusted to a position close to the protrusion 41c, the protrusions 40b and 41c are engaged with each other before the large fastening force is reached. The rotation is stopped. Further, as shown in FIG. 6, when the protrusion 40b is adjusted to a position away from the protrusion 41c, after reaching a large tightening force, the protrusions 40b and 41c are engaged to rotate the rotation propulsion shaft. The rotation of 15 is stopped. Thereby, the workpiece 2 is held on the vice 100 with a predetermined small tightening force or with a large tightening force.

  The rotation propelling member 41 is provided with a plurality of circumferential grooves 41f on the outer peripheral surface of the screw shaft side annular portion 41a. The plurality of circumferential grooves 41f are formed so that the end surface of the flange portion 42d of the adjustment ring 42 is circular. In the axial direction, it is arranged corresponding to the conical hole 42c of the adjustment ring 42 so as to coincide with the circumferential groove 41f. In FIG. 6, the steel ball 43 is engaged with the fourth conical hole 42c counted from the screw shaft side of the adjustment ring 42, that is, from the left side, and the end face of the flange portion 42d is the fourth counted from the right side. It coincides with the circumferential groove 41f. In FIG. 8, the steel ball 43 is engaged with the second conical hole 42c counted from the left side, and the end face of the flange portion 42d coincides with the second circumferential groove 41f counted from the right side. When the steel ball 43 is adjusted to engage with the leftmost conical hole 42c, the end surface of the flange portion 42d coincides with the rightmost circumferential groove 41f. Since 40b and 41c are engaged with each other, the booster 80 does not act. That is, since the hollow shaft 14 is not incapable of relative rotation with the main body frame 3b due to frictional force, the hollow shaft 14 is rotatable, the rotation propulsion shaft 15 is rotated to engage the protrusions 40b and 41c, and the clutch device 70. Due to the rotational transmission force, the hollow shaft 14 is rotated and the screw shaft 10 is rotated. When the tightening force of the workpiece 2 is increased and the rotational resistance of the hollow shaft 14 is increased, it is difficult to turn the handle, and the operator finishes the workpiece holding operation. Since the work booster 80 is not applied to the workpiece 2, the work 2 is held with a small tightening force, and is prevented from being deformed by the tightening force.

  The circumferential groove 41f of the rotation propelling member 41 gradually moves in the axial direction toward the screw shaft side as the rotation propelling shaft 15 moves, that is, as the tightening force increases, and the end surface of the flange portion 42d of the adjustment ring 42 And move relative. In the case of the present embodiment, as shown in FIG. 6, in a state where the predetermined thrust force is reached and the rotary propulsion shaft 15 is stopped, the circumferential groove 41f disposed on the rightmost side is the end face of the flange portion 42d. And the axial position match. When the protrusions 40b and 41c are engaged with each other and the rotation of the rotary propulsion shaft 15 is stopped, an impact force is applied to the protrusions 40b and 41c and the key 48 which is a locking member of the stopper ring 40. From the positional relationship between the end face of the flange portion 42d and the circumferential groove 41f, the operator knows that the tightening force is approaching the set value, and can reduce the impact force by slowing the rotational speed of the handle. it can. As a result, breakage and deformation of the components of the tightening force adjusting device 110 such as the protrusions 40b and 41c and the key 48 can be suppressed, and the rotation speed of the handle can be increased at the beginning of the work. Work holding work becomes possible.

  Further, in the present embodiment, the hollow shaft 14 is a frictional force generated by a reaction force based on the workpiece clamping force and is not rotatable relative to the frame body 3b, so that the protrusions 40b and 41c are engaged with each other. At this time, the hollow shaft 14 is slightly rotated against the frictional force. For this reason, the impact force applied to the protrusions 40b and 41c, the key 48, and the like is absorbed, and damage and deformation of the constituent members of the tightening force adjusting device 110 can be suppressed.

In this embodiment, the conical hole 42c, that is, the concave portion is provided in the adjustment ring 42, and the steel ball 43, that is, the convex portion is provided in the main body frame 3b, but the concave portion is provided in the main body frame 3b and the convex portion is adjusted. The ring 42 may be provided.
Further, the key 48 is provided on the hollow shaft 14 as a locking member of the stopper ring 40, but a pin is provided as a locking member on the hollow shaft 14 so as to protrude from the outer peripheral surface and extend in the axial direction provided on the stopper ring 40. It may be engaged with a groove.

  The vise 100 of this embodiment uses a mechanical booster 80 and uses the wedge action of the screw shaft side end portion 16a of the operating shaft 16, but as shown in FIG. 9, a hydraulic booster is used. An apparatus 90 may be used.

  The hydraulic booster 90 is provided with a radially inner stepped portion on the inner peripheral surface of the intermediate portion of the hollow shaft 14, and an operating shaft 37 supported by the stepped portion, and the inside of the stepped portion of the hollow shaft 14. The seal packing 38 is fitted and fixed to the peripheral surface and the seal surface is in contact with the operating shaft 37, and is fixed to the outer peripheral surface of the end shaft 11 on the side opposite to the screw shaft, and the seal surface is the hollow shaft 14. The seal packing 39 is in contact with the inner peripheral surface of the hollow shaft 14. A hydraulic chamber is formed between the stepped portion on the inner peripheral surface of the hollow shaft 14 and the end shaft 11, and is filled with hydraulic oil or the like. In the hydraulic chamber, the drive side sectional area is the sectional area of the operating shaft 37, and the driven side sectional area is the sectional area of the inner peripheral surface of the hollow shaft 14.

  The rotation transmission of the clutch device 70 is released, the rotation propulsion shaft 15 moves in the axial direction, and the operation shaft 37 is pressed. Since the hydraulic chamber has a driven side cross-sectional area that is much larger than the driving side cross-sectional area, the end shaft 11 is applied with a force much greater than the pressing force of the operating shaft 37. As the rotational force of the handle by the operator is increased, the rotation propulsion shaft 15 moves in the axial direction, and the pressing force of the operating shaft 37 increases, the end shaft 11 is pressed more strongly. Accordingly, as with the mechanical booster 80, the workpiece fastening force increases with the movement of the rotation propulsion shaft 15 in the axial direction, and the protrusion 41c of the rotation propulsion member 41 is connected to the protrusion 40b of the stopper ring 40. By engaging, the rotation of the rotary propulsion shaft 15 is stopped. Thereby, the workpiece 2 is held by the vice 100 with a predetermined tightening force.

  FIG. 10 shows a vise 100 including a tightening force adjusting device 120 according to the second embodiment of the present invention. The tightening force adjusting device 120 includes a stopper ring 50 fitted to the inner peripheral surface of the main body frame 3b and to the outer peripheral surface of the hollow shaft 14, and the stopper ring 50 is an anti-screw of the main body frame 3b. It has an anti-screw shaft side annular portion 50a exposed from the shaft side. The stopper ring 50 has a protruding portion 50 c protruding in the axial direction on the anti-screw shaft side surface 50 b, and the protruding portion 50 c can be engaged with the protruding portion 41 c of the rotation propelling member 41. Further, like the stopper ring 40 of the first embodiment, the stopper ring 50 has a key 48 protruding from the outer peripheral surface of the hollow shaft 14 as a locking member. The stopper ring 50 is connected to the hollow shaft via the key 48. 14 is engaged so as to be relatively unrotatable and relatively movable in the axial direction. Further, the stopper ring 50 is provided with a plurality of V-shaped circumferential grooves 50e in the axial direction on the outer peripheral surface, and the plurality of circumferential grooves 50e are inserted into the screw holes of the main body frame 3b. The positioning mechanism 121 in the axial direction of the stopper ring 50 is configured together with the steel ball 43 and the compression coil spring 44 that elastically biases the steel ball 43.

  The steel ball 43 is elastically biased radially inward by the compression coil spring 44 and is engaged with the circumferential groove 50e of the stopper ring 50, whereby the stopper ring 50 is appropriately positioned in the axial direction, The tightening force of the workpiece 2 is set.

  The clamping force of the workpiece 2 is changed by holding the flange portion 50d and sliding the stopper ring 50, that is, by further pulling out or pushing in the anti-screw shaft side annular portion 52a with respect to the main body frame 3b. The Thereby, the steel ball 43 is engaged with another circumferential groove 50e, the position of the stopper ring 50 in the axial direction is changed, and the tightening force of the workpiece 2 is changed.

  In the tightening force adjusting devices 110 and 120 according to the first and second embodiments of the present invention, the key 48 acting as a locking member for the stopper rings 40 and 50 is provided on the hollow shaft 14 and is provided on the hollow shaft. 14, the stopper rings 40, 50 are adjusted until the relative position in the axial direction with the main body frame 3 b is adjusted via the hollow shaft 14 and the rotation transmission of the clutch device 70 is released. It rotates integrally with the rotation propelling member 41. Therefore, when the rotation transmission of the clutch device 70 is released, the rotation phases of the stopper rings 40 and 50 and the rotation propelling member 41 are maintained as they are at the start of work. Therefore, the amount of rotation of the rotation propulsion shaft 15 until the stopper rings 40, 50 and the protrusions 40b, 50c, 41c of the rotation propelling member 41 are engaged with each other after the rotation transmission of the clutch device 70 is released is the work 2 Even if they are different, it becomes almost constant, and a predetermined work clamping force can be obtained accurately. However, the key that acts as a stopper member for the stopper ring may be provided on the main body frame 3b and protrude from the inner peripheral surface of the main body frame 3b. The vise 100 shown in FIG. 11 includes the tightening force adjusting device 130 of the third embodiment of the present invention configured as described above.

  The tightening force adjusting device 130 includes a stopper ring 55 that is fitted to the inner peripheral surface of the main body frame 3b and the outer peripheral surface of the hollow shaft 14, and the stopper ring 55 is an anti-screw of the main body frame 3b. It has an anti-screw shaft side annular portion 55a exposed from the shaft side. The stopper ring 55 has a protruding portion 55 c protruding in the axial direction on the anti-screw shaft side surface 55 b, and the protruding portion 55 c can be engaged with the protruding portion 41 c of the rotation propelling member 41. Further, as a locking member, a key 56 that is inserted into the main body frame 3b from the outside and held by the plate 57 and protrudes from the inner peripheral surface of the main body frame 3b is provided, and the stopper ring 55 has a key groove on the outer peripheral surface. And is engaged with the main body frame 3b via the key 56 so as not to be relatively rotatable and relatively movable in the axial direction. Further, the stopper ring 55 is provided with a plurality of conical holes 55e in the axial direction on the outer peripheral surface, and the plurality of conical holes 55e are steel balls 43 inserted into the screw holes of the main body frame 3b, and the Along with the compression coil spring 44 that elastically biases the steel ball 43, an axial positioning mechanism 131 of the stopper ring 55 is configured.

  Specifically, the phase difference between the screw hole provided on the inner peripheral surface of the main body frame 3b and the key 56 will be described in detail. The phase difference centered on the axis 10a is determined by the conical hole 55e provided on the outer peripheral surface of the stopper ring 55 and the key groove. In the present embodiment, both have a phase difference of 180 °. Thereby, the steel ball 43 urged by the compression coil spring 44 can be engaged with the conical hole 55e.

  The clamping force of the workpiece 2 is changed by holding the flange portion 55d and sliding the stopper ring 55 in the axial direction as in the clamping force adjusting device 120 of the second embodiment. The steel ball 43 is engaged with another conical hole 55e, and the position of the stopper ring 55 in the axial direction is changed.

  In the case of the present embodiment, when the rotation transmission of the clutch device 70 is released, the phase difference between the stopper ring 55 and the rotation propelling member 41 differs for each workpiece 2, and therefore both protrusions of the stopper ring 55 and the rotation propelling member 41. The amount of rotation of the rotation propulsion shaft 15 until the portions 55c and 41c are engaged with each other differs for each workpiece 2. However, by increasing the number of protrusions 55c and 41c of one or both of the stopper ring 55 and the rotation propelling member 41, for example, by providing four each, it is possible to suppress the difference in rotation amount.

  In the tightening force adjusting devices 110, 120, and 130 according to the first, second, and third embodiments of the present invention, the anti-screw shaft side annular portions 42a, 50a, and 55a that are exposed from the main body frame 3b. The position of the stopper ring 40, 50, 55 in the axial direction is changed, but the position of the stopper ring in the axial direction may be changed by rotating the anti-screw shaft side annular portion. The vise 100 shown in FIG. 12 includes the tightening force adjusting device 140 of the fourth embodiment of the present invention that is adjusted as described above.

  The tightening force adjusting device 140 includes a stopper ring 60 fitted to the outer peripheral surface of the hollow shaft 14 and an adjustment ring 61 fitted to the outer peripheral surface of the stopper ring 60. The adjustment ring 61 is formed with a fitting outer peripheral surface 61b that fits with the inner peripheral surface of the main body frame 3b, and a male screw 61c that engages with a female screw provided on the inner peripheral surface of the main body frame 3b. And an anti-screw shaft side annular portion 61a exposed from the anti-screw shaft side of the main body frame 3b. The stopper ring 60 has a protruding portion 60 b protruding in the axial direction on the anti-screw shaft side surface 60 a, and the protruding portion 60 b can be engaged with the protruding portion 41 c of the rotation propelling member 41. The stopper ring 60 uses a key 48 protruding from the outer peripheral surface of the hollow shaft 14 as a locking member, and the stopper ring 60 is relatively unmovable relative to the hollow shaft 14 and moves in the axial direction via the key 48. Engage possible. Further, the stopper ring 60 is provided with a pin 62, which extends in the radial direction and is inserted into a circumferential groove 61d provided on the inner peripheral surface of the adjustment ring 61. As a result, the stopper ring 60 and the adjustment ring 61 engage with each other so as to be capable of relative rotation and impermissible relative movement in the axial direction. Therefore, the stopper ring 60 and the adjustment ring 61 constitute a type of stopper ring composed of a plurality of members that can rotate relative to each other, and constitute the stopper ring described in the claims.

  A plurality of V-shaped circumferential grooves 61e are arranged in the axial direction on the fitting outer peripheral surface 61b of the adjustment ring 61, and the plurality of circumferential grooves 61e are inserted into the screw holes of the main body frame 3b. The positioning mechanism 141 in the axial direction of the stopper ring 60 is configured together with the steel ball 43 and the compression coil spring 44 that elastically biases the steel ball 43.

  The change of the tightening force of the workpiece 2 is executed by rotating the adjustment ring 61 while holding the flange portion 61f. Since the adjustment ring 61 is screw-engaged with the main body frame 3b, it moves in the axial direction, and the steel ball 43 engages with another circumferential groove 61e. As a result, the stopper ring 60 engaged with the adjustment ring 61 via the pin 62 so as not to move relative to the axial direction is changed in the axial direction position, the clamping force of the workpiece 2 is changed, and the workpiece machining is performed. It is possible to prevent the adjustment ring 61 from rotating and the setting of the tightening force from being changed due to internal vibration or the like.

  The positioning mechanism in the axial direction of the stopper ring may be positioned at a dimensional interval of 1 / integer of the screw pitch, such as 1 screw pitch of the screw engagement between the main body frame 3b and the adjustment ring, or 1/2 of the screw pitch. Good. The tightening force adjusting device 150 of the fifth embodiment of the present invention of the vise 100 shown in FIG. 13 includes such a positioning mechanism 151.

  The tightening force adjusting device 150 includes a stopper ring 60 that is used in the tightening force adjusting device 140 and is fitted to the outer peripheral surface of the hollow shaft 14, and an adjustment ring 66 that is fitted to the outer peripheral surface of the stopper ring 60. Including. The adjustment ring 66 is formed with a female screw 66c that engages with a female screw provided on the inner peripheral surface of the main body frame 3b, and has an anti-screw shaft side annular portion 66a that is exposed from the counter screw shaft side of the main body frame 3b. . The adjustment ring 66 is provided with a circumferential groove 66d on the inner peripheral surface, and a pin 62 provided in the stopper ring 60 is inserted into the circumferential groove 66d.

  The adjustment ring 66 is provided on the outer peripheral surface with one groove extending in the axial direction or a plurality of grooves 66b that are equally divided in the circumferential direction. In the present embodiment, one groove 66b is provided. The groove 66b constitutes a positioning mechanism 151 in the axial direction of the stopper ring 60 together with a steel ball 43 inserted into the screw hole of the main body frame 3b and a compression coil spring 44 that elastically biases the steel ball 43. .

  The tightening force of the workpiece 2 is changed by manually rotating the adjustment ring 66. Since the adjustment ring 66 is screw-engaged with the main body frame 3 b, the adjustment ring 66 moves in the axial direction, and the steel ball 43 engages with the groove 66 b every rotation of the adjustment ring 66. Thereby, the stopper ring 60 engaged with the adjustment ring 66 through the pin 62 so as not to move relative to the axial direction is changed in the axial direction position, the clamping force of the workpiece 2 is changed, and the workpiece processing is performed. It is possible to prevent the adjustment ring 66 from rotating and the setting of the tightening force from being changed due to the internal vibration or the like. In addition, on the outer peripheral surface of the adjustment ring 66, a flat surface may be provided instead of the groove 66b so as to extend in the axial direction. The same operation and effect as the groove 66b are obtained.

  In the above embodiment, the keys 48 and 56 are supported as the engaging members on the hollow shaft 14 or the main body frame 3b, and the keyways are formed in the stopper rings 40, 50, 55 and 60. It is also possible to adopt a configuration in which a key groove is formed in the hollow shaft 14 or the main body frame 3b. Moreover, you may fix to the hollow shaft 14 or the main body flame | frame 3b using a pin as an engaging member, and a pin is penetrated by the axial direction groove | channel formed instead of a keyway. Further, the stopper rings 40, 50, 55, 60 are not rotatable relative to the hollow shaft 14 or the main body frame 3b via the engaging member. In the stopper ring and the hollow shaft, or the stopper ring and the main body frame, The stopper ring can also be made non-rotatable relative to the hollow shaft or the main body frame by forming the cross-sectional shape of the peripheral surface into a polygon or the like and making a part or all of the peripheral surface a flat surface in contact with each other. is there.

  The present invention is not limited to any of the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

It is sectional drawing which shows the whole vise provided with the clamping force adjustment apparatus 110 of 1st Example of this invention, and shows the state before starting work holding | maintenance operation | movement. FIG. 1 shows a state where clamping of the work 2 is started. FIG. 1 shows a state in which the workpiece 2 is held with a predetermined tightening force. It is a principal part enlarged view of FIG. In contrast to FIG. 4, the inner member is shown in an outline view. It is a principal part enlarged view of FIG. In contrast to FIG. 6, the inner member is shown in an outline view. FIG. 4 shows a state in which the work clamping force is changed. It is a modification of the first embodiment in which a booster different from the first embodiment of the present invention is used, and is an enlarged view of a main part. It is a principal part enlarged view of a vise provided with the clamping force adjustment apparatus 120 of the 2nd Example of this invention. It is a principal part enlarged view of a vise provided with the clamping force adjustment apparatus 130 of the 3rd Example of this invention. It is a principal part enlarged view of a vise provided with the clamping force adjustment apparatus 140 of the 4th Example of this invention. It is a principal part enlarged view of a vise provided with the clamping force adjustment apparatus 150 of the 5th Example of this invention.

Explanation of symbols

1 Table 2 Work 3 Body frame 3a Body frame 3b Body frame 4 Slide cover 5 Fixed jaw 6 Movable jaw 7 Key 8 Key 9 Nut 10 Screw shaft 10a Axis 10b Engagement end 11 End shaft 12 Pin 13 Hexagon socket head cap screw 14 hollow shaft 15 rotation propulsion shaft 15a handle engagement hole 16 operating shaft 16a screw shaft side end 17 roller 18 roller 19 operating shaft support member 19a screw shaft side end surface 20 nut 21 clutch ring 22 key 23 compression coil spring 24 bearing holder 25 Bearing holder 26 Needle bearing 27 Belleville spring 28 Hexagon socket head cap bolt 29 Hexagon socket head cap screw 30 Thrust bearing 31 Retaining ring 32 O-ring holder 33 Thrust metal 34 Hexagon socket head cap screw 35 Hexagon socket head cap screw 36 Hexagon socket head cap screw 37 Actuating shaft 38 sticker Seal 39 Seal packing 40 Stopper ring 40a Anti-screw shaft side surface 40b Protruding portion 40c Engaging surface 40d Inclined surface 40e Circumferential groove 41 Rotating propelling member 41a Screw shaft side annular portion 41b Screw shaft side surface 41c Protruding portion 41d Engaging surface 41e Inclined surface 41f Circumferential groove 42 Adjustment ring 42a Anti-screw shaft side annular portion 42b Groove 42c Conical hole 42d Flange portion 43 Steel ball 44 Compression coil spring 45 Hexagon socket head cap screw 46 Pin 47 Pin 48 Key 50 Stopper ring 50a Anti-screw shaft side annular portion 50b Anti-screw shaft side surface 50c Protruding portion 50d Flange portion 50e Circumferential groove 55 Stopper ring 55a Anti-screw shaft side annular portion 55b Anti-screw shaft side surface 55c Protruding portion 55d Flange portion 55e Conical hole 56 Key 57 Plate 60 Stopper ring 60a Anti-screw shaft Side surface 60b Protrusion 61 Adjusting phosphorus 61a Counter screw shaft side annular portion 61b Fitting outer peripheral surface 61c Male thread 61d Circumferential groove 61e Circumferential groove 61f Flange portion 62 Pin 66 Adjustment ring 66a Anti screw shaft side annular portion 66b Groove 66c Male screw 66d Circumferential groove 70 Clutch device 80 Boosting force Device 90 Booster device 100 Vise 110 Tightening force adjusting device 111 Positioning mechanism 120 Tightening force adjusting device 121 Positioning mechanism 130 Tightening force adjusting device 131 Positioning mechanism 140 Tightening force adjusting device 141 Positioning mechanism 150 Tightening force adjusting device 151 Positioning mechanism

Claims (8)

A screw shaft that moves the movable jaw in the axial direction, a booster that is provided on one end side of the screw shaft and presses the screw shaft and has an operating shaft on the anti-screw shaft side, and rotational propulsion adjacent to the operating shaft of the booster And a hollow shaft supported by the main body frame so as to be rotatable and immovable in the axial direction of the screw shaft.The hollow shaft surrounds the booster, and one end thereof is not rotatable relative to the screw shaft. The shaft is engaged so as to be relatively movable in the axial direction, the other end is screw-engaged with the rotation propulsion shaft, and the rotation of the rotation propulsion shaft is transmitted through the clutch device. In a vise with an intensifier that exerts a pressing force corresponding to the screw force on the operating shaft relative to the hollow shaft.
A stopper ring that has a protrusion protruding in the screw shaft direction and through which the hollow shaft is inserted, and at least when the rotation transmission of the clutch device is released, is not rotatable relative to the main body frame,
A protrusion that is fixed to the opposite end of the rotary propulsion shaft and protrudes in the direction of the screw shaft on the side of the screw shaft, and that can be engaged with the protrusion of the stopper ring as the rotary propulsion shaft rotates and moves in the axial direction. A tightening force adjusting device including a rotation propulsion member having
The vise with a booster, wherein the stopper ring is adjusted in relative axial position with the main body frame. 2. The booster according to claim 1, wherein the stopper ring is not rotatable relative to the main body frame via a locking member that protrudes from the outer peripheral surface of the hollow shaft and restricts relative rotation between the stopper ring and the hollow shaft. Vise with device. The outer peripheral surface of the stopper ring and the inner peripheral surface of the main body frame are opposed to each other, and a positioning mechanism for regulating the axial position of the stopper ring is provided
The positioning mechanism includes a concave portion on one of the outer peripheral surface and the inner peripheral surface and a convex portion on the other, and one of the concave portion and the convex portion is disposed in the axial direction, and the other is , Provided to be movable toward the one side,
The stopper ring is adjusted relative to the main body frame in the axial direction by selectively engaging one of the concave portion and the convex portion with the other. The vise with a booster according to claim 1 or 2. The vise with a booster according to claim 3, wherein the other of the concave portion and the convex portion is elastically biased toward the one side and can be engaged with the one side. A depression is formed in the main body frame and the engaging member is inserted to provide a convex portion on the main body frame, and the engaging member is elastically biased toward the concave portion and can be engaged with the concave portion. The vise with a booster according to claim 3 or 4, wherein the vise is equipped with a booster. The stopper ring has an anti-screw shaft side annular portion that extends in the axial direction and is exposed from the anti-screw shaft side of the main body frame,
The rotation propulsion member has a screw shaft side annular portion extending in the axial direction toward the screw shaft side, and the screw shaft side annular portion is inserted into the anti-screw shaft side annular portion and has the protruding portion. The vise with a booster according to any one of claims 1 to 5. The vise with a booster according to claim 6, wherein a circumferential groove is provided on an outer circumferential surface of the screw shaft side annular portion of the rotation propulsion member. The vise with a booster according to claim 7, wherein a plurality of the circumferential grooves are provided corresponding to one of a plurality of concave portions and convex portions provided in the axial direction.

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