JP2018158397A - Chuck device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chuck device including master jaws that oscillate and enabling a user to easily check if the jaws are in a proper stroke range when holding a workpiece.SOLUTION: A chuck device includes: a chuck body; multiple oscillation support holes provided in the chuck body at an equal interval; jaws each having a top jaw and a master jaw; and a plunger which has linkage means respectively linking to the other end sides of the master jaws and slides along a rotation axis. The jaws are oscillated by movement of the plunger to hold a workpiece. The chuck device is configured to include stability check means.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a chuck device for grasping a workpiece by swinging a jaw with a machine tool such as a lathe.

As a conventional example of a chuck device used in a machine tool, for example, there is a chuck device disclosed in Patent Document 1. In this type of chuck device, a plurality of jaws that slide in a radial direction are arranged radially on the front surface of a cylindrical chuck body. These jaws slide in the radial direction so as to grasp the workpiece located at the central portion.
The jaw includes a master jaw that is slidably supported on the chuck body, and a top jaw that is detachably attached to the master jaw and grasps a workpiece.
Although not described in Patent Document 1, generally, such a chuck device is provided with a range in which a grasping force is stably output with respect to input (hereinafter referred to as an appropriate stroke range). It can be confirmed visually. Thereby, it is possible to prevent the workpiece from scattering and the chuck from being damaged.
Specifically, two boundary lines of the appropriate stroke range are provided on the end face on the front side of the chuck body in the vicinity where the master jaw is disposed, while a reference line for confirmation is provided on the side surface of the master jaw. Is provided.
In other words, when the workpiece is grasped, if the base line provided on the master jaw is between the two boundary lines provided on the chuck body, it can be confirmed that the position of the master jaw is within the appropriate stroke range. Has been made.
That is, it is possible to easily check whether or not the grasping force is stably output at the stop position slid in the radial direction of the master jaw when grasping the workpiece.
As another conventional example of another chuck device, for example, there is a chuck device disclosed in Patent Document 2. In this type of chuck device, a plurality of swinging jaws are arranged radially on the front surface of a cylindrical chuck body. By swinging these jaws, the workpiece located at the central part is grasped.
The jaw includes a master jaw having a spherical portion in the middle, and a top jaw that is detachably attached to the master jaw and grasps a workpiece.
The chuck body is provided with a plurality of spherical through-holes, and the spherical portions of the master jaw are fitted in these through-holes so as to be in slidable surface contact. That is, when the top jaw swings around the spherical portion of the master jaw, the workpiece is grasped or the grasping state of the workpiece is released.

JP 7-178608 A JP 2011-251347 A

  However, since the chuck device as in Patent Document 2 grasps the workpiece by the swing of the top jaw, the chuck device within the appropriate stroke range depends on the stop position of the master jaw that slides in the radial direction at the time of grasping as in Patent Document 1. Since it is different from the structure in which the stability of the grasping force is confirmed by confirming whether it is present, it has not been possible to easily confirm whether it is within the proper stroke range.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a chuck device in which a master jaw swings so that it can be easily confirmed whether it is within an appropriate stroke range when a workpiece is grasped.

  The disclosed means relates to a chuck device having a plurality of jaws that swing by the operation of a plunger to grasp a workpiece.

  Specifically, the chuck device grasps the workpiece, and a chuck body provided rotatably around the rotation axis, a plurality of swing support holes provided at equal intervals around the rotation axis in the chuck body. A jaw having a top jaw and a master jaw having a spherical portion that is fitted to the middle portion in a state in which the top jaw is detachably attached and is in surface contact with each swinging support hole so as to be slidably contactable with each other. And linking means housed in the chuck body and linked to the other end side of each master jaw, and each linking means presses the other end side of each master jaw by a sliding movement along the rotation axis. And a plunger configured as described above. Then, each top jaw grasps the workpiece by moving one end side of the master jaw toward or away from the rotational axis by a swinging operation centered on the spherical portion by the pressing operation to each master jaw of each linkage means. Alternatively, the grasping state is released. In such a chuck device, a solution means including a stability confirmation means was taken.

  That is, according to this chuck device, it is possible to visually confirm whether or not the grasping force can be stably produced during grasping. Thereby, it is possible to prevent the workpiece from scattering and the chuck from being damaged.

  In particular, the stability confirmation means includes a confirmation pin having one end provided on the plunger and the other end protruding out of the chuck body by a sliding operation of the plunger and having a mark for confirming the stability of the gripping force, and a confirmation pin on the chuck body. It is preferable to have a pin hole penetrating through.

  If it does so, it can be judged by slide operation of a plunger whether it is in the suitable stroke range at the time of work grasping. That is, by visually observing the position of the pin mark linked with the slide position of the plunger when grasping the workpiece, it can be easily confirmed whether it is within the appropriate stroke range.

  Further, the stability confirmation means includes an upstream pin whose one end is provided in the chuck body and whose other end is in contact with the jaw, a downstream pin whose one end is movable in the radial direction and can be protruded outside the chuck body, and an upstream pin and a downstream pin. It is preferable to have an engagement means for engaging the other end, and to have a mark for confirming the stability of the gripping force on at least one of the upstream pin and the downstream pin.

  Then, the confirmation of the grasping state of the jaw can be confirmed directly by the swinging motion of the jaw.

  In that case, the engaging means is in the middle of the upstream pin, a sharply inclined portion whose surface approaches the rotation axis as it goes to one end, and a sharp slope that approaches the plunger as it goes to the other end of the downstream pin It is preferable that the surface of the inclined portion and the inclined surface are in contact with each other to have a wedge structure.

  If it does so, since the axis | shaft of an upstream pin and a downstream pin can be changed with a wedge structure, a pin can be protruded in the position which is easy to confirm.

  Further, the stability check means includes a contact pin having one end provided in the chuck body and the other end in contact with the jaw, and a lever in which one end is engaged with the contact pin and a midway portion is rotatably supported by the chuck body. It is preferable that at least one of the other end of the contact pin and the lever has a mark for confirming the stability of the gripping force.

  By doing so, the other end of the lever does not protrude from the chuck body, so that the penetration of the facet into the chuck body can be reduced.

  According to the chuck device of the present invention, it is possible to easily confirm whether the stroke is within the proper stroke range when grasping the workpiece, and thus it is possible to confirm a stable grasping force. Accordingly, it is possible to prevent the workpiece from scattering and the chuck from being damaged, and to use the device while ensuring safety.

It is the schematic which looked at the chuck device concerning Embodiment 1 of the present invention from the front. It is a schematic sectional drawing in the arrow XX line in FIG. It is an enlarged view equivalent to FIG. 2 concerning Embodiment 2 of this invention. It is an enlarged view equivalent to FIG. 2 concerning Embodiment 3 of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the following description is merely illustrative in nature and does not limit the present invention, its application, or its use. In addition, when expressing a direction by description, unless it mentions especially, let the side by which the workpiece | work W is grasped | ascertain be the front side, and let the opposite side be a back side.

Embodiment 1 of the Invention
<Structure of chuck device 1>
1 and 2 show a chuck device 100 according to Embodiment 1 of the present invention. FIG. 1 is a schematic view of the chuck device 100 as viewed from the front, and FIG. 2 is a schematic cross-sectional view taken along line XX in FIG. The chuck device 100 is attached to a lathe (not shown) and grasps the workpiece W, and includes a metal chuck body 10 having a disk shape that can rotate in a predetermined direction around a rotation axis J. .

  The chuck body 10 has a disk-like appearance with a large thickness, and its rear end face is attached by fastening a bolt B2 to a lathe (not shown). Further, on the front side of the chuck main body 10, a plurality of jaws 20 (three in this embodiment, but two or more are sufficient) for grasping the workpiece W located at the central portion from the inside or the outside. Are arranged at equal intervals in the circumferential direction.

  Each jaw 20 includes a master jaw 21 that is swingably provided on the chuck body 10 and a top jaw 22 that grasps the workpiece W. The top jaw 22 can be attached to and detached from the master jaw 21 with a bolt B3. Is attached. Each jaw 20 is arranged such that a center line T extending in the radial direction passes through the center of the chuck body 10 when the chuck body 10 is viewed from the front.

<Structure of chuck body 10>
The chuck body 10 includes a body 11, a rear cover 12, a center cover 13, a bush 30, a plunger 40, a ring member 50 and the like in addition to the master jaw 21.

  The body 11 has a disc portion 11a whose center coincides with the rotation axis J and has a disc shape, and a cylindrical extension portion 11b extending along the rotation axis J from the outer peripheral edge of the disc portion 11a. It is the bottomed cylindrical member which consists of.

  On the front side of the disc portion 11a, a first center hole 11c having a circular cross section penetrating along the rotation axis J toward the back side is provided at the central portion. Around the first center hole 11c, three fitting holes 11d communicating with the rotation axis J in the same direction are provided at equal intervals around the rotation axis J. The front side of the fitting hole 11d is The step portion 11e having a larger diameter than the fitting hole 11d is provided in a step shape. Furthermore, between the fitting holes 11d, first mounting holes 11f having a circular cross section penetrating in the same direction as the rotation axis J are provided at equal intervals around the rotation axis J. 11f can be used to fix the body 11 to a lathe (not shown) with a bolt B2.

  On the other hand, the inner periphery of the extending portion 11b is formed in a substantially trilobal shape when viewed in the extending direction of the rotation axis J, and the plunger 40 and a part of the master jaw 21 are accommodated inside the extending portion 11b. It has come to be.

  The rear cover 12 is a disk-shaped member whose center coincides with the rotation axis J and closes the opening of the body 11 (extending portion 11b). The center portion on the front side of the rear cover 12 has a first center hole 11a. The second center hole 12a is penetrated at substantially the same diameter as the first center hole 11a at the opposing position. Similarly, on the front side, a second mounting hole 12b is penetrated at a position facing the first mounting hole 11f so as to have substantially the same diameter as the first mounting hole 11f. By closing the body 11 with such a rear cover 12, a substantially trilobal accommodation space S is formed in a portion surrounded by the body 11 and the rear cover 12.

  The bush 30 is a cross-sectional hat-shaped member having a cylindrical portion 31 and a flange portion 32 extending radially outward from the outer peripheral edge portion of the cylindrical portion 31, and each fitting hole 11 d provided in the body 11. Respectively. Specifically, the cylindrical portion 31 of the bush 30 is fitted in the fitting hole 11d, and the flange portion 32 is fitted in the step portion 11e. And in this state, it is being fixed to the body 11 with the volt | bolt B5.

  On the other hand, a swing support hole 33 that extends in the same direction as the rotation axis J and communicates with the accommodation space S penetrates the inner side, and the inner peripheral surface of the swing support hole 33 has a curved cross section. An annular groove 34 is recessed.

  The plunger 40 has a substantially trilobal appearance that is substantially equivalent to the accommodation space S when viewed in the extending direction of the rotation axis J, and extends radially from the slide shaft portion 41 and the outer peripheral surface of the middle portion of the slide shaft portion 41. The three protruding portions 42 are provided, and are accommodated in the accommodation space S.

  One end of the slide shaft 41 is slidably inserted into a first center hole 11 c formed in the body 11, and the other end is inserted into a second center hole 12 a formed in the rear cover 12. That is, the first and second center holes 11 c and 12 a guide the slide shaft portion 41, so that the plunger 40 can slide along the rotation axis J.

  Further, the slide shaft portion 41 is formed with a screw insertion hole 43 penetrating from the front side to the rear side, and a draw bar (not shown) of a lathe using a bolt B1 inserted through the screw insertion hole 43. ) Can be fixed to the plunger 40.

  A rotation support hole 44 extending in the same direction as the rotation axis J and penetrating therethrough is formed at a position facing the fitting hole 11 d formed in the body 11 of each overhanging portion 42. The peripheral surface is a concave groove 45 having a curved cross section extending in an annular shape.

Each rotation support hole 44 is fitted with a ring member 50 (linking means) in which a through hole 51 is formed.
The outer peripheral surface of the ring member 50 has a ridge shape with a curved cross section extending in an annular shape, and is in surface contact with the inner peripheral surface of the rotation support hole 44 so as to be slidable.

  Three master jaws 21 having a substantially T shape are attached to the chuck body 10. The master jaw 21 mainly includes an attachment portion 21a, a spherical portion 21b, and an inclined shaft portion 21c.

The attachment portion 21 a is provided on one end side of the master jaw 21 and can be attached to the top jaw 22 extending along the radial direction of the chuck body 10.
The spherical portion 21b is provided in the middle portion of the master jaw 21 so as to be continuous with the mounting portion 21a. The spherical portion 21b has an outer diameter in a spherical shape corresponding to the swing support hole 33 (annular concave groove portion 34). Is formed. That is, the spherical portion 21 b is fitted into the annular groove groove 34 in a state in which the outer circumferential surface of the spherical portion 21 b is in surface contact with the inner circumferential surface of the annular groove groove portion 34 so as to be slidable.

The inclined shaft portion 21c is provided on the other end side of the master jaw 21, and is a round bar-like member that extends so as to gradually approach the rotation axis J as the distance from the spherical portion 21b increases.
Such an inclined shaft portion 21 is slidably inserted into the through hole 51 of the ring member 50. That is, the plunger 40 is linked to the other end side of the master jaw 21 via the ring member 50.

  In this state, when the plunger 40 is slid to either one along the rotation axis J, the other end side of each master jaw 21 is set to the rotation axis J while each ring member 50 is in sliding contact with the rotation support hole 44. The pressing is performed in the approaching direction or in the direction away from the rotation axis C1. Further, the master jaw 21 pressed by each ring member 34 swings around the spherical portion 21b while the other end side slides with respect to the ring member 34, so that one end side of the master jaw 21 is relative to the rotation axis J. Accordingly, each top jaw 22 grasps the workpiece W or cancels the grasping state of the workpiece W.

<Stability confirmation means>
The stability confirmation means 60 is configured to easily confirm whether it is within the appropriate stroke range by interlocking with the sliding operation of the plunger 40 as an input source.
Specifically, the stability confirmation means 60 includes a confirmation pin 61 having one end fixed to the front side of the plunger 40 and a range line 62 provided at the other end, and the other end of the confirmation pin 61 is a sliding operation of the plunger 40. The pin insertion hole 63 is provided in the body 11 so as to protrude outward from the chuck body 10.
That is, the appropriate stroke range can be confirmed with the range line 62 of the confirmation pin 61 when grasping the workpiece. For example, when both of the range lines 62 protrude or are embedded from the chuck body 10, the appropriate stroke range is not satisfied. On the other hand, when either one of the range lines 62 protrudes or is embedded, the appropriate stroke is set. Usage within the range is possible.

The stability confirmation unit 60 according to the present invention is not limited to the above-described first embodiment, and includes various other configurations.
For example, not limited to the range line, the range may be confirmed by color coding such as painting, or the range may be formed on a flat surface and confirmed on the flat surface. It does not matter.
In addition, the chuck device 100 according to the first embodiment constitutes the bush 30, but the stability confirmation means 60 is applied to the chuck device 100 in which the bush 30 is excluded and the master jaw 21 directly contacts the body 11. It doesn't matter.

As described above, according to the first embodiment of the present invention, it is possible to visually confirm whether or not the grasping force can be stably produced when grasping the workpiece W. 100 damage can be prevented.
Further, it is possible to determine whether or not the workpiece is within the appropriate stroke range at the time of grasping the workpiece at the position where the plunger 40 is stopped by the sliding operation. That is, by visually observing the position of the range line of the confirmation pin 61 interlocked with the slide position of the plunger 40 at the time of grasping the workpiece, it is possible to easily confirm whether it is within the appropriate stroke range with a simple structure. .

<< Embodiment 2 of the Invention >>
FIG. 3 shows another example (stability confirmation means 70) of the stability confirmation means. In the second embodiment, since the stability confirmation means 70 for determining whether the workpiece is within the appropriate stroke range is different from the stability confirmation means 60 of the first embodiment, the rest is the same as in the first embodiment. Hereinafter, only parts different from the first embodiment will be described in detail.

The stability confirmation means 70 is configured to easily confirm whether it is within an appropriate stroke range by contacting the swinging jaw 20.
Specifically, the stability confirmation unit 70 includes an upstream pin 71, a downstream pin 72, coil springs 73 and 75, a washer 74, and the like.

The chuck body 10 is provided with a pin hole P1 extending from the front end face in the same direction as the rotation axis J, and a coil spring 75 is stored at the bottom of the pin hole P1. Further, a pin hole P2 penetrating in the radial direction of the chuck body 10 from the outer peripheral side end surface is provided so as to be orthogonal to the pin hole P1.
An upstream pin 71 is provided in the pin hole P1 and a downstream pin 72 is provided in the pin hole P2.

  On the other hand, a countersink hole P3 having a diameter larger than that of the pin hole P2 is provided on the outer peripheral side of the pin hole P2, and a washer 74 is fixed to the bottom surface of the countersink hole P3.

The upstream pin 71 has a pin shape substantially the same diameter as the pin hole P1, and one end is slidable within the pin hole P1 so as to be able to protrude out of the chuck body 10, and a midway portion is formed at the other end. A notch groove 71b having a sharp inclined portion 71a whose surface approaches the rotation axis J as it goes is provided.
On the other hand, a coil spring 75 is in contact with the other end, and the coil spring 75 applies an elastic force to the upstream pin 71 and is always biased against the master jaw 21.

The downstream pin 72 includes a shaft portion 72b provided with a range line 72d at one end and a head portion 72a formed continuously from the shaft portion 72b at the other end.
The downstream pin 72 having such a configuration is housed in the pin holes P2 and P3 so as to be slidable in the radial direction of the chuck body 10. The shaft 72 b at one end can protrude out of the chuck body 10 via a washer 74, while the head 72 a at the other end is engaged with the upstream pin 71.

The head 72a is formed to have substantially the same diameter as the pin hole P2, while the shaft 72b is a rod-like member having a smaller diameter than the head 72a.
The head 72a has a sharp inclined surface 72c that approaches the plunger 40 toward the other end of the downstream pin.

  The coil spring 73 is inserted into the shaft portion 72b and is accommodated between the base end of the head portion 72a and the fixed washer 74. The head portion 72a is applied with the elastic force of the coil spring 73, The state is always biased toward the rotation axis J side.

  That is, when the top jaw 22 grasps the outer shape of the workpiece W, when the top jaw 22 grasps the workpiece W, a gap is temporarily generated between the upstream pin 71 and the master jaw 21. The downstream pin 72 moves toward the rotation axis J by the restoring force of the coil spring 73 by this gap. At this time, the upstream pin 71 moves toward the master jaw 21 so as to fill the gap by the wedge action on the inclined portion 71a of the upstream pin 71 and the inclined surface 72c of the downstream pin 72 and the restoring force of the coil spring 75. When the workpiece W is grasped, both the upstream pin 71 and the downstream pin 72 are in a balanced state, and by checking the position of the range line provided on the downstream pin at that time, it is possible to determine whether or not the workpiece is within the proper range. It has become.

The stability confirmation unit 70 according to the present invention is not limited to the above-described second embodiment, but includes various other configurations.
For example, in the above-described second embodiment, the upstream pin 71 is always in contact with the master jaw 21, but not limited to the master jaw 21, it may be in contact with the top jaw 22 at all times.
In addition, although the range line 72d is provided on the downstream pin, it does not matter as long as it is at least one of the upstream pin and the downstream pin, and it is not limited to the range line, and the range is confirmed by color coding such as painting. Alternatively, the range may be formed on a flat surface and confirmed within the flat surface, or confirmation other than this may be performed.
Further, although the chuck device 100 constitutes the bush 30, the stability confirmation means 70 may be applied to the chuck device 100 having a configuration in which the bush 30 is excluded and the master jaw 21 directly contacts the body 11.

  As described above, according to the second embodiment of the present invention, the confirmation of whether or not the workpiece W is within the appropriate stroke range when grasping the workpiece W can be confirmed by oscillating the master jaw 21 until the workpiece is grasped and stopped. By visually observing the position of the range line, it can be easily confirmed whether it is within the appropriate stroke range.

<< Embodiment 3 of the Invention >>
FIG. 4 shows still another example (stability confirmation means 80) of the stability confirmation means. In the third embodiment, since the stability confirmation means 80 for determining whether the workpiece is within the appropriate stroke range is different from the stability confirmation means 70 of the second embodiment, the rest is the same as the second embodiment. Hereinafter, only parts different from the second embodiment will be described in detail.

The stability confirmation means 80 is configured so that it can be easily confirmed whether it is within an appropriate stroke range by contacting the swinging jaw 20.
Specifically, the stability confirmation means 80 includes a contact pin 81, a lever 82, a coil spring 83, a face cover 84, a stop lid 85, and the like.

The chuck body 10 is provided with a pin hole P1 extending from the front end face in the same direction as the rotation axis J, and a coil spring 83 is stored at the bottom of the pin hole P1. Further, a pin hole P4 penetrating in the radial direction of the chuck body 10 from the outer peripheral side end surface is provided so as to be orthogonal to the pin hole P1.
A contact pin 81 can be inserted into such a pin hole P1, and a lever 82 is rotatably provided in the pin hole P4.
The pin hole P4 is formed with an annular stepped portion D1 and an annular stepped portion D2 that increase in diameter radially outward, and the annular stepped portion D2 is provided on the outer peripheral surface of the chuck body 10. It has been.

The contact pin 81 has a pin shape substantially the same diameter as the pin hole P1, and one end is slidable within the pin hole P1 so as to be able to protrude out of the chuck body 10, and the middle part is the chuck body. There are 10 through holes 81a penetrating in the radial direction.
On the other hand, a coil spring 83 is in contact with the other end, and the coil spring 83 applies a resilient force to the contact pin 81 and is constantly biased against the master jaw 21.

The lever 82 is provided with a reference line 82c at one end, and the engaging portion 82a at the other end is fitted into the through hole 81a. On the other hand, a fixing pin 82b is provided in the middle portion, and the lever 82 is rotatable with the fixing pin 82b as a fulcrum.
Further, one end side of the lever 82 is fitted and inserted into a face protection cover 82, and this face protection cover 82 is disposed in the annular step portion D1. Further, a stop lid 85 is provided so as to cover the face shield cover 82.
A restricting hole 85a is provided in the central portion of the stopper lid 85, and the restricting hole 85a is drilled so that one end of the lever 82 can rotate only in the rotation direction. In addition, a range line 85b is provided on the upper end surface of the stop lid 85 in the vicinity of the restriction hole 85a.

  That is, when the top jaw 22 grasps the outer shape of the work W, when the top jaw 22 goes to grasp the work W, a gap is temporarily generated between the contact pin 81 and the master jaw 21. The lever 82 rotates with the fixing pin 82b as a fulcrum by the restoring force of the coil spring 83 by this gap. When the workpiece W is grasped, both the contact pin 81 and the lever 82 are in a balanced state, and it is confirmed whether or not the reference line 82c provided on the lever 82 at that time is within the range line 85b. It is possible to judge.

The stability confirmation unit 80 according to the present invention is not limited to the above-described third embodiment, but includes various other configurations.
For example, in the above-described second embodiment, the contact pin 81 is always in contact with the master jaw 21. However, the contact pin 81 is not limited to the master jaw 21 and may be always in contact with the top jaw 22.
In addition, the reference line 82c is provided on the lever and the range line 85b is provided on the stop lid 85. However, the range line may be provided on one end side of the contact pin 81. It may be confirmed by color-coding, or the range may be formed on a flat surface and confirmed on the flat surface, or confirmation other than this may be performed.
Further, the chuck device 100 constitutes the bush 30, but the stability confirmation means 80 may be applied to the chuck device 100 configured such that the bush 30 is excluded and the master jaw 21 directly contacts the body 11.

  As described above, according to the third embodiment of the present invention, since the other end of the lever does not protrude from the chuck body, the penetration of the facet into the chuck body can be reduced. In addition, since it is possible to confirm whether the workpiece W is within the appropriate stroke range with the reference line and the range line when grasping the workpiece W, since it is the same confirmation method as a general chuck, an operator's confirmation error is unlikely to occur.

  As described above, the present invention is suitable for a swinging chuck device that is used by being attached to a machine tool such as a lathe.

DESCRIPTION OF SYMBOLS 10 Chuck body 20 Jaw 21 Master jaw 21b Spherical part 22 Top jaw 33 Swing support hole 40 Plunger 50 Ring member (linkage means)
60, 70, 80 Stability confirmation means 61 Confirmation pin 62 Mark 63 Pin insertion hole 71 Upstream pin 71a Inclined part (engagement means)
72 Downstream pin 72c Inclined surface (engaging means)
81 Contact pin 82 Lever 100 Chuck device J Rotating shaft P1, P2 Pin hole W Workpiece

Claims (5)

A chuck body rotatably provided around the rotation axis;
A plurality of swing support holes provided at equal intervals around the rotation axis in the chuck body;
A master having a top jaw for grasping a workpiece, and a spherical portion that is removably attached to one end and that is fitted in the middle portion in a state of being in surface contact so as to be slidably contactable with the swing support holes. Joe with Joe,
It has linkage means housed in the chuck body and linked to the other end side of each master jaw, and each linkage means moves the other end side of each master jaw by a sliding movement along the rotation axis. A plunger configured to press,
Each top jaw is moved by moving one end side of the master jaw toward or away from the rotation axis by a swinging motion centered on the spherical portion by pressing the master jaws to the master jaws. In the chuck device configured to grasp the state or to release the grasped state, the chuck device is provided with stability confirmation means.   A confirmation pin having one end provided on the plunger, the other end projecting out of the chuck body by a sliding movement of the plunger, and having a mark for confirming stability of the grasping force; and the chuck body The chuck device according to claim 1, further comprising a pin hole through which the confirmation pin is inserted.   The stability check means includes an upstream pin, one end of which is provided in the chuck body, the other end abutting the jaw, a downstream pin which is movable in a radial direction and which can protrude outside the chuck body, and the upstream pin. The engagement means for engaging the other end of the downstream pin, and at least one of the upstream pin and the downstream pin has a mark for confirming the stability of the gripping force. The chuck apparatus as described.   The engaging means has a sharply inclined portion whose surface approaches the rotation axis toward one end in the middle of the upstream pin, and a sharpened portion that approaches the plunger toward the other end of the downstream pin. The chuck device according to claim 3, wherein the chuck device has an inclined surface, and has a wedge structure by contacting a surface of the inclined portion and the inclined surface. The stability check means has one end provided in the chuck body, the other end in contact with the jaw, one end engaged with the contact pin, and a lever that is rotatably supported by the chuck body. The chuck device according to claim 1, further comprising: a mark for confirming stability of grasping force on at least one of the contact pin and the other end of the lever.

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