TW202017680A - Chuck apparatus - Google Patents

Abstract

Provided is a chuck apparatus configured to prevent jaws from slipping out of jaw mount parts while avoiding complication and increase in size of a jaw automatic exchange device. In the present invention, a wedge plunger is configured to: slide in the front-rear direction in a plunger slide space so as to cause a plurality of jaws for gripping a workpiece to slide in the inner-outer direction; and switch between connection and disconnection of cam connection in association with the slide. A safety pin is configured: to be stored inside a chuck body so as to be slidable in the front-rear direction; and to slide, in association with sliding of the wedge plunger, between a retaining position for preventing slipout of the jaws outward of the jaw mount part and a retaining disconnection position for not preventing the slipout. When the wedge plunger slides in the direction in which the cam connection is disconnected, the safety pin is configured to slide from the retaining position to the retaining disconnection position.

Description

Chuck device

The invention relates to a chuck device which can automatically replace a jaw using an automatic jaw replacement device.

Patent documents 1 to 2 disclose a chuck device. This chuck device is configured so that the jaws can be replaced by pulling the jaws outward from the outer end side of the jaw attachment portion.

【Existing technical documents】

【Patent Document】

Patent Literature 1: Japanese Patent Laid-Open No. 2014-237212

Patent Document 2: Japanese Patent Laid-Open No. 2015-013338

The chuck device of Patent Documents 1 and 2 maintains the jaws by connecting the jaws and the wedge plunger with a cam, but if the cam connection is released due to breakage, there is a jaw from the jaw attachment portion to the The danger of the foreign party breaking away.

In order to solve the above-mentioned problems, the present invention provides a chuck device that can avoid the complexity and enlargement of the automatic jaw replacement device and prevent the jaws from being separated from the jaw mounting portion.

According to the present invention, a chuck device can be provided, which includes a plurality of jaws for holding a workpiece, a chuck body, a wedge plunger, and a safety pin. Wherein, the chuck main body portion is provided with a plurality of jaw mounting portions radially on the front surface side, and the plurality of jaw mounting portions can mount the plurality of jaws apart from each other at an inner position close to each other Sliding between the outer positions of the wedge, the wedge plunger is configured such that, with the cam connected to the jaws, the plunger sliding space provided on the inner side of the chuck body slides in the front-back direction to make the clip The claw slides in the inner and outer directions, and the cam link is alternately connected and released as the wedge plunger slides, and the safety pin is housed inside the chuck body in a state capable of sliding in the front-rear direction. Sliding of the wedge plunger, the safety pin slides between an anti-disengagement position that prevents the jaws from escaping outward of the jaw mounting portion and an anti-detachment release position that does not prevent the disengagement, the wedge post When the plug slides in the direction in which the cam connection is released, the safety pin is configured to slide from the anti-detachment position to the anti-detachment release position.

In the configuration of the present invention, by arranging the safety pin at the detachment prevention position, detachment of the jaws can be prevented. Moreover, since the safety pin slides along with the sliding of the wedge plunger, a device for sliding the safety pin is not required, and it does not cause complexity and enlargement of the automatic jaw replacement device.

Preferably, the chuck device described above is configured such that when the wedge plunger slides in the front-back direction in the front section in the plunger sliding space, the cam connection is maintained and the jaws are mounted along the jaws Sliding the wedge plunger to the rear section in the plunger sliding space while the part slides in the inward and outward directions, the cam coupling is released, and the jaws can be removed from the jaws without being disturbed by the wedge plunger When the wedge plunger is in the front section, the safety pin is in the disengagement prevention position when the outer end side of the mounting portion is detached outward. If the wedge plunger slides from the front section to the rear section, it will accompany With this slide, the safety pin slides to the release prevention release position.

Preferably, the chuck device described above is configured such that a rear pressing portion P _{1 that} presses the safety pin to the rear is provided on the wedge plunger or another member integrally fixed with the wedge plunger, which is The rear pressed portion P ₂ pressed by the rear pressing portion P ₁ is provided on the safety pin or another member integrally fixed with the safety pin. When the wedge plunger is present in the front section, the rear pressing portion P ₁ and the rear the pressing portion P ₂ not in contact with the safety pin is located at the disengaged position preventing the plunger sliding wedge section from the front side to said rear section, with respect to the rear portion P ₂ is pressed by the rear pressing the front portion P ₁ Press the rear pressed portion P ₂ directly or through other members to slide the safety pin to the disengagement prevention release position.

Preferably, in the chuck device described above, in the disengagement prevention position, the front end portion of the safety pin is inserted into a safety pin insertion recess provided on the rear surface side of the jaw, and in the disengagement prevention release position, the safety The front end of the pin is not inserted into the safety pin insertion recess.

Preferably, the chuck device described above, wherein the safety pin includes a safety pin body, A rear shaft portion extending rearward from the rear end surface of the safety pin body portion, an enlarged diameter portion provided at the rear end portion of the rear shaft portion, the wedge plunger is provided with the cam coupling portion and the cam coupling portion A wedge plunger body part behind the cam coupling part and the rear shaft part of the safety pin is inserted.

Preferably, the chuck device described above is provided with a safety pin front urging member for urging the safety pin toward the front.

Preferably, the chuck device described above is configured such that if the wedge plunger slides from the rear section to the front section, the safety pin slides to the anti-disengagement position along with the sliding.

Preferably, the chuck device described above is configured such that the front pressing portion Q ₁ that presses the safety pin forward is provided on the wedge plunger or another member fixed integrally with the wedge plunger, The front pressed portion Q ₂ pressed by the front pressing portion Q ₁ is provided on the safety pin or another member fixed integrally with the safety pin. When the wedge plunger slides from the rear section to the front section, the The front pressed portion Q ₂ , the front pressing portion Q ₁ abuts directly from the rear or through another member, presses the front pressed portion Q ₂ forward, and slides the safety pin to the disengagement prevention position.

Preferably, the chuck device described above includes a safety pin maintaining device configured to maintain the safety pin at the disengagement prevention position, and the wedge plunger slides the safety pin to the rear To release the maintenance of the safety pin at the anti-disengagement position.

Preferably, a chuck device including a chuck body and a wedge plunger is provided. The chuck main body portion is provided with a plurality of jaw mounting portions radially on the front surface side, and the plurality of jaw mounting portions allows the plurality of jaws holding the workpiece to be installed between an inner position close to each other and an outer position separated from each other slide. The wedge plunger is configured such that the plunger sliding space provided inside the chuck body is slid in the front-rear direction while the cam is connected to the jaws to slide the jaws in the inner and outer directions. When the wedge plunger slides in the front-rear direction in the front section in the plunger sliding space, the cam connection is maintained, and the jaws slide in the inner and outer directions along the jaw mounting portion, while sliding the wedge plunger into the plunger sliding space At the rear section, the cam connection is released, and the jaws can be removed from the outer end side of the jaw attachment portion to the outside without being disturbed by the wedge plunger. The chuck device is characterized in that the safety pin provided on the rear surface side of the clamping jaw is inserted into the recess to prevent the safety pin from escaping outside the clamping jaw mounting portion, and is housed inside the disk main body portion in a slidable state in the front-back direction At the same time, the rear pressing part P _{1 that} presses the safety pin to the rear is provided on the wedge plunger, and the rear pressed part P _{2 that is} pressed by the rear pressing part P ₁ is provided on the safety pin, and the wedge post is located in the front section of the plunger sliding space At the time of plugging, the rear pressing portion P ₁ and the rear pressed portion P _{2 are} not in contact, and the safety pin is located at the anti-detachment position where the front end portion of the safety pin is inserted into the safety pin insertion recess, and the wedge plunger moves from the front section of the plunger sliding space slides to the rear section, with respect to the rear portion P ₂ is pressed, the rear portion P ₁ abuts the pressing from the front, the rear pressing portion P ₂ is pressed backward, so that the safety pin slides to the front end portion of the safety pin from the safety pin An anti-detachment release position where the insertion recess is detached.

10‧‧‧Chuck device

11‧‧‧Chuck body

11a‧‧‧jaw mounting part

15‧‧‧ Wedge plunger

15a‧‧‧Cam protrusion

15b‧‧‧Cam connection

15c‧‧‧Wedge plunger body

16‧‧‧Safety pin

16a‧‧‧Main part of safety pin

16a1‧‧‧Slot for position maintenance

16b‧‧‧ Rear shaft

16c‧‧‧Expansion Department

19‧‧‧Forcing parts in front of safety pin

20‧‧‧ Chimera for position maintenance

21‧‧‧Mosaic force-applying parts

22‧‧‧Components of plunger

30‧‧‧jaw

31‧‧‧Soft gripper

32‧‧‧Main gripper

32a‧‧‧Cam groove

32b‧‧‧ safety pin inserted into the recess

40 ‧‧‧ gripper action part of automatic gripper replacement device

P ₁ ‧‧‧ Rear pressing part

P ₂ ‧‧‧ Pressed back

Q ₁ ‧‧‧ Front pressing part

Q ₂ ‧‧‧ Front pressed part

S ₁ ‧‧‧ Front section

S ₂ ‧‧‧ Rear section

W‧‧‧Workpiece

α‧‧‧ Plunger sliding space

FIG. 1 is a state view of the chuck device according to the present invention when a jaw is attached from the front surface side.

FIG. 2 is a diagram showing a chuck device according to the first embodiment, and is specifically a state diagram of a workpiece gripped by a jaw.

3 is a diagram showing the chuck device of the first embodiment, which specifically slides the wedge plunger from the front section to the rear section of the plunger sliding space, and the rear pressing portion P ₁ and the rear pressed portion P ₂ abut State diagram of the moment.

4 is a diagram showing the chuck device of the first embodiment, specifically, a state in which the wedge plunger is slid to the retracted end position of the rear section in the plunger sliding space, and a state where the anti-detachment member of the jaw is released by the safety pin Figure.

5 is a diagram showing a chuck device according to a second embodiment, which is a state diagram in which the wedge plunger is slid to the retracted end position of the rear section in the plunger sliding space.

6 is a diagram showing a chuck device according to a second embodiment, which is a state diagram in which a wedge plunger is slid to a front section in a plunger sliding space, and a safety pin is slid to a disengagement prevention position.

The preferred embodiment of the chuck device of the present invention will be described in detail using the drawings. The chuck device of the first embodiment and the chuck device of the second embodiment will be exemplified below. However, the technical scope of the present invention is not limited to these chuck devices, and can be appropriately changed without departing from the gist of the present invention.

1. The chuck device of the first embodiment

First, the chuck device of the first embodiment will be described.

1 to 4 are diagrams showing the chuck device 10 of the first embodiment. FIG. 1 is a state view of the chuck device 10 after the jaws 30 are mounted from the front surface side, FIG. 2 is a state view of the workpiece W being gripped by the jaws 30 mounted on the jaw mounting portion 11a, and FIG. 3 is a wedge The plunger 15 slides from the front section S ₁ to the rear section S _{2 of the} plunger sliding space α, and the rear pressing portion P ₁ and the rear pressed portion P _{2 are} in contact with each other. FIG. 4 shows the plunger sliding space In α, the wedge plunger 15 is slid to the retracted end position of the rear section S ₂ . FIGS. 2 to 4 are cross-sectional views obtained by transversely translating the disk device 10 on a plane including the center line L ₁ and showing only one side (upper side) of the center line L ₁ .

As shown in FIG. 2, the chuck device 10 of the first embodiment includes a chuck body 11, a wedge plunger 15, and a safety pin 16. The wedge plunger 15 is accommodated in the plunger sliding space α provided inside the chuck body 11. The wedge plunger 15 forms a plunger part together with the member 22 and the like, and is connected to a cylinder device (not shown) provided behind the chuck device 10 through an unillustrated drawing tube. By driving the cylinder device, the wedge plunger 15 can be slid in the front-back direction within the plunger sliding space α.

The specific form of the wedge plunger 15 is not particularly limited. In the chuck device 10 of the first embodiment, as shown in FIG. 2, the wedge plunger 15 is composed of a cam coupling portion 15 b and a wedge plunger body portion 15 c. The cam connecting portion 15b appears as a portion where the cam protrusion 15a is provided, and as described later, appears as a portion where the cam is connected to the jaw 30. On the other hand, the wedge plunger body portion 15c appears as a portion provided behind the cam coupling portion 15b, and a portion where the rear shaft portion 16b of the safety pin 16 is inserted.

The chuck body portion 11 may be rotated about the center by _a not shown rotation driving mechanism (motor) to the center line L. As shown in FIG. 1, the front surface of the chuck body 11 is provided with a plurality of (three in the same figure) gripper mounting portions 11 a radially on the center line L _1. In the chuck device 10 of the first embodiment jaw mounting portion 11a configured to be rotationally symmetrical (the center line L ₁ is rotationally symmetric). The jaws 30 are attached to the respective jaw attachment portions 11a. These jaws 30 may (in _one radial direction centered on the center line L) sliding along the direction of the respective inner and outer mounting portions 11a of the jaws. If the plurality of jaws 30 is slid inward (toward the center line L ₁ ) along the respective jaw attachment portions 11a, the plurality of jaws 30 are brought closer to each other. Conversely, if the plurality of jaws 30 are along each the slide clamp pawl mounting portion 11a outward direction (away from the center line of L _1), the plurality of jaws 30 are separated from each other. By such an operation of the jaw 30, the operation of gripping the workpiece W by the jaw 30 and the operation of releasing the workpiece W can be performed.

In the chuck device 10 of the first embodiment, the jaw attachment portion 11a is formed by a groove. The recess (jaw mounting portion 11a) is fitted to jaw 30, through the recess (jaw mounting portion 11a) in the jaw guide 30 and outside direction (center line L ₁ is the center of the radial direction). In the chuck device 10 of the first embodiment, the clamping jaw 30 is composed of the soft clamping jaw 31 abutting on the work W and the main clamping jaw 32 connected to the rear surface side of the soft clamping jaw 31, wherein the main clamping jaw 32 guides the fitting It fits into the groove (jaw mounting portion 11a).

A cam groove 32a is provided on the side surface of the main jaw 32 constituting each jaw 30. The cam groove 32 a is fitted (cam coupled) to the cam protrusion 15 a of the wedge plunger 15. Main jaws 32a and the cam groove of the cam wedge plunger 32 of the ridge 15 is inclined to the center line 15a are set to the state of L _1. Therefore, if the wedge plunger 15 is slid in the front-back direction in the plunger sliding space α, the movement of the front-rear direction is converted to the movement of the inner-outer direction by the cam mechanism composed of the cam groove 32a and the cam protrusion 15a. 30 Slide in and out.

In addition, the chuck device 10 of the first embodiment can automatically replace the jaws 30 by the slightly same jaw automatic changing device shown in Patent Document 1. Therefore, the jaw attachment portion 11a is provided until reaching the outer peripheral portion of the chuck body portion 11, whereby the jaw 30 attached to the jaw attachment portion 11a can be pulled outward from the outer end portion of the jaw attachment portion 11a. The operation of pulling out the jaw 30 from the jaw attachment portion 11a can be performed by an automatic jaw replacement device. However, as described above, the main jaw 32 of the jaw 30 is in a state where the cam groove 32a provided therein is fitted into the cam protrusion 15a of the wedge plunger 15 (state in which the jaw 30 is cam-connected with the wedge plunger 15) At this time, the jaw 30 cannot be pulled out from the jaw attachment portion 11a while maintaining this state.

In this regard, in the chuck device 10 of the first embodiment, when the chuck device 10 performs a chuck operation (an operation of sliding the jaw 30 holding the workpiece W in the inner and outer directions), as shown in FIG. 2, the wedge plunger 15 in the front section S _{1 of the} plunger sliding space α (the section where the cam groove 32a of the main jaw 32 and the cam protrusion 15a of the wedge plunger 15 fit. In each figure, the position of the rear end surface of the wedge plunger 15 is used as a reference In the front section S1) sliding, when replacing the jaws 30 mounted on the chuck device 10, as shown in FIGS. 3 and 4, the wedge plunger 15 retreats in the rear section S _{2 of the} plunger sliding space α (in each figure) The position of the rear end surface of the wedge plunger 15 is used as a reference to indicate the rear section S2), so that the engagement of the cam groove 32a of the main jaw 32 and the cam protrusion 15a of the wedge plunger 15 is separated (the jaw 30 and the wedge plunger 15 The cam link is released). In other words, it is configured to alternately connect and release the cam connection with the sliding of the wedge plunger 15. Thereby, when the jaw 30 attached to the chuck body 11 is pulled out from the outer end of the jaw mounting portion 11 a using the jaw automatic replacement device, the wedge plunger 15 can be prevented from being disturbed by the jaw 30.

However, even if the wedge plunger 15 is located in the front section S ₁ of the plunger sliding space α, if there is a case where the fitting portion of the cam groove 32a of the main jaw 32 and the cam protrusion 15a of the wedge plunger 15 is damaged, the The claw 30 is not disturbed by the wedge plunger 15 and assumes a state of moving along the jaw mounting portion 11a. At this time, the jaw 30 may be detached from the jaw attachment portion 11a outward due to gravity. Furthermore, in the chuck device 10 of the first embodiment, when the chuck device 10 can be rotated around the center line L ₁ , the jaws 30 may be affected by the centrifugal force when rotating the chuck device 10. The jaw attachment portion 11a is separated from the outside and is scattered.

的擴徑部16c構成。擴徑部16c為可從後方軸部16b拆卸的結構，通過卸載擴徑部16c可將後方軸部16b插通於楔子柱塞主體部15c。 Therefore, in the chuck device 10 of the first embodiment, as shown in FIG. 2, the safety pin 16 is attached to the chuck body 11, and the front end portion of the safety pin 16 is inserted into the safety pin provided on the rear surface side of the jaw 30. Insert the recess 32b. The specific form of the safety pin 16 is not particularly limited. In the chuck device 10 of the first embodiment, the safety pin 16 is faced from the rear end of the safety pin body 16a by the safety pin body 16a inserted in the safety pin insertion recess 32b. Rear shaft portion 16b extending rearward and provided at the rear end portion of rear shaft portion 16b

The enlarged diameter portion 16c constitutes. The enlarged diameter portion 16c has a structure that is detachable from the rear shaft portion 16b, and by unloading the enlarged diameter portion 16c, the rear shaft portion 16b can be inserted into the wedge plunger body portion 15c.

Jaw safety pin 30 is inserted into the recess portion 32b to form a certain length along the medial-lateral direction (the diameter direction of the center line L ₁ is the center). Therefore, when the jaw 30 slides within a general stroke range (stroke range used when gripping the workpiece W), the safety pin 16 is not disturbed by the jaw 30. Conversely, when the clamping jaw 30 holds the workpiece W, the fitting portion composed of the cam groove 32a of the main clamping jaw 32 and the cam protrusion 15a of the wedge plunger 15 is damaged, etc., causing the cam coupling of the clamping jaw 30 and the wedge plunger 15 to be released When the jaw 30 may slide toward the outer end of the jaw mounting portion 11a due to the above-mentioned gravity, the front end of the safety pin 16 is hooked to the inner end of the safety pin insertion recess 32b to prevent the jaw 30 from sliding beyond this point direction. In other words, when the workpiece W is held by the clamping jaw 30, even if there is a breakage of the fitting portion formed by the cam groove 32a of the main clamping jaw 32 and the cam protrusion 15a of the wedge plunger 15, the clamping jaw 30 will not be removed from the clamping jaw. The mounting portion 11a is detached.

However, as described above, when replacing the jaws 30, it is necessary to pull out the jaws 30 outward from the outer end side of the jaw attachment portion 11a. In this regard, when the jaw 30 is replaced, if the safety pin 16 is inserted into the safety pin insertion recess 32 b of the jaw 30, the safety pin 16 interferes with the jaw 30 and the jaw 30 cannot be pulled out from the jaw attachment portion 11 a. . Therefore, the safety pin 16 in the chuck device 10 of the first embodiment is supported by the chuck body 11 in a slidable state in the front-rear direction, and it can be determined according to the state of the chuck device 10 (whether the jaw 30 is in the state of holding the workpiece W or not). (Change the state of the jaws 30) Change the front and rear positions of the safety pin 16.

That is, as shown in FIG. 2, when the gripper 30 grips the workpiece W (when the wedge plunger 15 is located in the front section S ₁ of the plunger sliding space α), the safety pin 16 slides forward until the front end of the safety pin 16 is inserted At the position where the safety pin is inserted into the recess 32b (disengagement prevention position). In contrast, as shown in FIG. 4, when the jaw 30 is replaced (wedge plunger 15 is located in the rear section S ₂ of the plunger sliding space α), the safety pin 16 slides backward to the front end of the safety pin 16 and is inserted from the safety pin The position where the concave portion 32b is pulled out (anti-disengagement release position). This sliding action of the safety pin 16 is performed in conjunction with the sliding of the wedge plunger 15 in the front-rear direction. That is, as the wedge plunger 15 slides, the safety pin 16 slides between an anti-disengagement position that prevents the jaw 30 from escaping outwardly of the jaw attachment portion 11a and an anti-detachment release position that does not prevent the detachment.

Specifically, as shown in FIG. 2, the rear pressing portion P ₁ provided in the wedge plunger 15 (in the chuck device 10 of the first embodiment, behind the wedge plunger body 15 c) and the safety pin 16 are provided When the rear pressed portion P ₂ (the front face of the enlarged diameter portion 16c in the chuck device 10 of the first embodiment) is not in contact, even if the wedge plunger 15 slides in the front-back direction, the safety pin 16 remains in the anti-disengagement position status. As shown in FIGS. 3 and 4, the wedge plunger 15 slides backward to the rear side section S ₂ of the plunger sliding space α into a state where the rear pressing portion P ₁ and the rear pressed portion P ₂ abut each other, and is pressed from the rear The pressing force applied by the portion P ₁ to the rear is released backward by the pressing portion P ₂ , and the safety pin 16 and the wedge plunger 15 slide integrally toward the rear. It should be noted that the rear pressing portion P ₁ may be provided in another member fixed integrally with the wedge plunger 15, and the rear pressed portion P ₂ may be provided in another member fixed integrally with the safety pin 16.

Accordingly, in order to replace the jaws 30, when the plunger ₂ toward the rear that the wedge section S from the plunger front side of the sliding space α section Sl 15 slides backward, the plunger 15 along the sliding rearward cleat, the safety pin 16 will automatically Retreat to the anti-disengagement release position. That is, when the wedge plunger 15 slides in the direction in which the cam connection of the wedge plunger 15 to the jaw 30 is released, the safety pin 16 slides from the disengagement prevention position to the disengagement prevention release position.

The rear side of the safety pin 16 is provided with a safety pin front urging member 19 that urges the safety pin 16 forward. Therefore, if the wedge plunger 15 located in the rear section S ₂ slides forward, the safety pin 16 following the wedge plunger 15 also slides forward. As shown in FIG. 2, the safety pin 16 stops at the safety pin body The front surface of the flange-shaped portion (safety pin side stopper) of the outer peripheral portion of the rear end of 16a abuts on the position of the front wall surface (chuck body side stopper) of the plunger sliding space α.

As described above, in the chuck device 10 of the first embodiment, when the wedge plunger 15 slides from the front section S ₁ to the rear section S _{2 of the} plunger sliding space α, the safety pin 16 can be prevented from Automatically slide away from the release position.

In addition, the safety pin 16 and the wedge plunger 15 are not completely integrated (it is not a structure in which the safety pin 16 and the wedge plunger 15 have been sliding integrally), but a structure is adopted, which is a separate structure that can be mutually The safety pin 16 and the wedge plunger 15 sliding in the rear direction slide only when the rear pressing portion P ₁ and the rear pressed portion P ₂ abut. With this structure, the sliding width of the safety pin 16 in the front-rear direction can be made shorter than the sliding width of the wedge plunger 15 in the front-rear direction. Therefore, by making the depth (depth in the front-rear direction) of the safety pin insertion into the recess 32b shallower, the front-rear length of the chuck body 11 can be suppressed. Thereby, the high bending rigidity of the chuck device can be maintained, the processing time of the workpiece can be shortened, and the processing range of the workpiece can be expanded.

2. Chuck device of the second embodiment

Next, the chuck device 10 of the second embodiment will be described.

5 and 6 are diagrams showing the chuck device 10 of the second embodiment. 5 is a state diagram of sliding the wedge plunger 15 to the retracted end position of the rear section S ₂ in the plunger sliding space α. 6 is a state diagram in which the wedge plunger 15 is slid to the front side section S ₁ in the plunger sliding space α, and the safety pin 16 is slid to the disengagement prevention position. 5 and 6 are cross-sectional views obtained by transversely translating the disk device 10 on a plane including the center line L ₁ and showing only one side (upper side) of the center line L ₁ .

In the chuck device 10 of the first embodiment, when the wedge plunger is located in the front section S ₁ of the plunger sliding space α (when the jaw 30 grips the workpiece W), the rear pressing portion P ₁ and the rear pressed portion P _{2 are} not in contact Then, the safety pin 16 is located in the anti-detachment position. In contrast, when the wedge plunger 15 slides from the front section S ₁ to the rear section S _{2 of the} plunger sliding space α (when the wedge plunger 15 of the replacement jaw 30 slides to the rear), the rear pressing portion P _{1 is} moved from the front The rear pressed portion P ₂ abuts against the rear pressed portion P ₂ to the rear, and the safety pin 16 slides to the release prevention release position. This operation is the same in the chuck device 10 of the second embodiment. The chuck device 10 of the second embodiment will be described below mainly on the configuration different from the chuck device 10 of the first embodiment described above. The configuration not specifically described in the chuck device 10 of the second embodiment adopts the same configuration as the chuck device 10 of the first embodiment.

In the chuck device 10 of the first embodiment described above, as shown in FIG. 2, the safety pin 16 is urged forward by the safety pin forward urging member 19 disposed on the rear side of the safety pin 16, and is urged forward by the safety pin The urging force of the member 19 returns the safety pin 16 at the anti-disengagement release position (FIG. 4) to the anti-disengagement position (FIG. 2). In contrast, the chuck means 10 in the second embodiment, as shown in Figures 5 and 6, a plunger disposed in front of the wedge portion 15 of the pressing Q ₁ and provided in front of the safety pin 16 is pressed against the _second contact portion Q Then, the front pressed portion Q _{2 is} pressed forward, and the safety pin 16 located in the anti-detachment release position (FIG. 5) is returned to the anti-detachment position (FIG. 6 ). It should be noted that the front pressing portion Q ₁ may be provided on another member fixed integrally with the wedge plunger 15, and the front pressed portion Q ₂ may be provided on another member fixed integrally with the safety pin 16.

As described above, in the chuck device 10 of the second embodiment, the sliding operation of the safety pin 16 forward (operation returning to the anti-disengagement position) is performed by the contact of the front pressing portion Q ₁ and the front pressed portion Q ₂ . Therefore, in the chuck device 10 of the second embodiment, the safety pin front urging member 19 can be omitted. The position where the front pressing portion Q ₁ and the front pressed portion Q ₂ are provided in the wedge plunger 15 and the safety pin 16 is not particularly limited, but in the chuck device 10 of the second embodiment, the front face of the wedge plunger body portion 15c This corresponds to the front pressing portion Q ₁ , and the rear surface of the safety pin main body portion ₁₆ a corresponds to the front pressed portion Q ₂ .

Further, the chuck means 10 in the second embodiment, the wedge plunger 15 on the front side section S _1, the plunger 15 when the wedge is slid rearward so that the front of the pressing portion is pressed against the front of Q ₁ and Q ₂ do not abut portion, then The safety pin 16 will be slidable backward. Therefore, there is a possibility that the safety pin 16 moves from the detachment prevention position due to the vibration generated by the chuck device 10. Here, in this embodiment, in order to maintain the safety pin 16 at the anti-detachment position, a safety pin maintenance device is provided. In the chuck device 10 of the second embodiment, as shown in FIG. 6, the safety pin maintenance device includes a position maintenance groove provided on the outer peripheral portion of the safety pin 16 (more specifically, the outer peripheral portion of the safety pin main body portion 16a) 16a1, a position maintaining fitting body 20 fitted in the position maintaining groove portion 16a1, and a fitting body urging member 21 that urges the position maintaining fitting body 20 on the safety pin 16 side. When the safety pin 16 slides to the anti-disengagement position (FIG. 6 ), the safety pin maintenance device is fitted into the position-maintaining groove portion 16 a 1 by the position-maintaining fitting body 20 to maintain the safety pin 16 at the anti-disengagement position.

The groove portion 16a1 for position maintenance has a spherical shape except that the inner wall surface is inclined. The fitting body 20 for maintaining the position of the chuck device 10 of the second embodiment is composed of a steel ball. Therefore, the degree of vibration generated by the chuck device 10 does not cause the position maintaining groove portion 16a1 to separate from the position maintaining fitting body 20, and the safety pin 16 can be maintained at the detachment preventing position. The wedge plunger 15 is slid backward, and the rear pressing portion P ₁ abuts on the rear pressed portion P _2. If a pressing force is applied backward from the wedge plunger 15 to the safety pin 16, a fitting body for position maintenance is caused 20 is separated from the position maintaining groove 16a1. In other words, if a pressing force is applied backward from the wedge plunger 15 to the safety pin 16, the maintenance of the safety pin 16 against the disengagement position is released, and the safety pin 16 assumes a state in which it can slide backward. Since the position maintaining groove portion 16a1 is annular throughout the outer periphery of the safety pin main body portion 16a, the position maintaining fitting body 20 can be fitted into the position maintaining groove portion even if the safety pin 16 rotates around its center line 16a1.

Since the chuck device 10 of the second embodiment does not need to provide the safety pin front urging member 19 as described above, there is no need to reserve a space for installing the safety pin front urging member 19 behind the safety pin 16. Therefore, compared to the chuck device 10 of the first embodiment, the front and rear lengths of the chuck body 11 of the chuck device 10 of the second embodiment can be shortened, and the bending rigidity of the chuck device 10 can be kept high. The advantages.

3. Other implementations

. Each of the rear pressing portion P ₁ and the front pressing portion Q ₁ can press the rear pressed portion P ₂ and the front pressed portion Q ₂ by other members. Among them, the wedge plunger 15 and the safety pin 16 are not fixed integrally with the other components mentioned above.

. A protrusion is provided on the jaw 30 instead of the safety pin insertion recess 32b. When the jaw 30 attempts to disengage, the protrusion and the safety pin 16 are brought into contact to prevent the jaw 30 from coming off.

10‧‧‧Chuck device

11‧‧‧Chuck body

11a‧‧‧jaw mounting part

30‧‧‧jaw

Claims (9)

A chuck device includes a plurality of clamping jaws holding a workpiece, a chuck body, a wedge plunger, and a safety pin, wherein, The chuck main body portion is provided with a plurality of jaw mounting portions radially on the front surface side, and the plurality of jaw mounting portions can mount the plurality of jaws at an inner position close to each other and an outer side spaced apart from each other Sliding between positions, The wedge plunger is configured such that the plunger sliding space provided inside the chuck body is slid in the front-back direction while the cam is connected to the jaws to slide the jaws in the inside and outside directions, With the sliding of the wedge plunger, the cam connection is alternately connected and released, The safety pin is housed inside the chuck body in a state capable of sliding in the front-rear direction, As the wedge plunger slides, the safety pin slides between an anti-disengagement position that prevents the jaw from escaping outward of the jaw attachment portion and an anti-detachment release position that does not prevent the detachment, When the wedge plunger slides in the direction in which the cam coupling is released, the safety pin is configured to slide from the disengagement prevention position to the disengagement prevention release position. The chuck device according to claim 1, which is configured as: When the wedge plunger slides in the front-back direction in the front section in the plunger sliding space, the cam connection is maintained, and the jaws slide in the inside and outside directions along the jaw mounting portion, When the wedge plunger is slid to the rear section in the plunger sliding space, the cam connection is released, and the clamping jaw can be removed from the clamping jaw mounting portion without being disturbed by the wedge plunger The outer end side is disassembled to the outside, When there is the wedge plunger in the front section, the safety pin is located in the anti-detachment position, If the wedge plunger slides from the front section to the rear section, the safety pin slides to the disengagement prevention release position along with the sliding. The chuck device according to claim 2, which is configured as: The rear pressing portion P _{1 that} presses the safety pin to the rear is provided on the wedge plunger or other member integrally fixed with the wedge plunger, Pressed rearward by the pressing portion P ₁ of the rear portion P ₂ is provided in the pressing member of the other of said safety pin or safety pin and fixed integrally, When the wedge plunger is present in the front section, the rear pressing portion P ₁ and the rear pressed portion P _{2 are} not in contact, and the safety pin is located at the disengagement prevention position. When the wedge plunger slides from the front section to the rear section, the rear pressing section P ₁ abuts from the front with respect to the rear pressed section P ₂ , and presses the rear section directly or through other components The rear pressed portion P ₂ slides the safety pin to the release prevention position. The chuck device according to any one of claim 1 to claim 3, wherein In the disengagement prevention position, the front end portion of the safety pin is inserted into a safety pin insertion recess provided on the rear surface side of the jaw, In the disengagement prevention release position, the front end portion of the safety pin is not inserted into the safety pin insertion recess. The chuck device according to any one of claim 1 to claim 4, wherein, The safety pin includes a safety pin body portion, and extends rearward from the rear end surface of the safety pin body portion The rear shaft portion, the enlarged diameter portion provided at the rear end portion of the rear shaft portion, The wedge plunger includes the cam coupling portion that is cam-coupled to the jaw, and a wedge plunger body portion that is provided behind the cam coupling portion and into which the rear shaft portion of the safety pin is inserted. The chuck device according to any one of claim 1 to claim 5, which is provided with a safety pin front urging member for urging the safety pin toward the front. The chuck device according to claim 2, which is configured as: If the wedge plunger slides from the rear section to the front section, the safety pin slides to the anti-detachment position along with the sliding. The chuck device according to claim 7, which is configured as: A front pressing portion Q ₁ that presses the safety pin forward, is provided on the wedge plunger or other member fixed integrally with the wedge plunger, ₁ is pressed in front of the front portion of the pressing portion is pressed Q Q _2, is provided on said safety pin or safety pin and the other fixing member as a whole, When the wedge from the rear section of the plunger is slid to the front side section, with respect to the front of the pressed portion Q _2, Q ₁ in front of the pressing portion directly or through another member abuts the pressing portion is pressed forward from the rear to the front Q ₂ , thereby sliding the safety pin to the anti-disengagement position. The chuck device according to any one of claim 1 to claim 8, comprising a safety pin maintaining device configured to maintain the safety pin at the disengagement prevention position, and the When the wedge plunger slides the safety pin to the rear, the maintenance of the safety pin at the disengagement prevention position is released.

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