WO2020066566A1

WO2020066566A1 - Chuck apparatus

Info

Publication number: WO2020066566A1
Application number: PCT/JP2019/035337
Authority: WO
Inventors: 弘也大西; 智也廣本
Original assignee: 株式会社北川鉄工所
Priority date: 2018-09-27
Filing date: 2019-09-09
Publication date: 2020-04-02
Also published as: TW202017680A; JPWO2020066566A1

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 present invention relates to a chuck device capable of automatically exchanging jaws using an automatic jaw exchanging device.

チャック Patent Documents 1 and 2 disclose chuck devices that are configured such that the jaws can be replaced by pulling the jaws outward from the outer end side of the jaw mounting portion.

JP 2014-237212 A JP-A-2015-013338

In the chuck devices of Patent Documents 1 and 2, the jaw is held by connecting the jaw and the wedge plunger by cam, but when the cam connection is released due to breakage or the like, the jaw moves outward from the jaw mounting portion. There is a risk of falling off.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a chuck device that prevents a jaw from coming out of a jaw mounting portion without inviting a complicated and large-sized automatic jaw changing device. It is.

According to the present invention, there is provided a chuck device including a plurality of jaws for gripping a workpiece, a chuck body, a wedge plunger, and a safety pin, wherein the chuck body moves the plurality of jaws closer to each other. And a plurality of jaw mounting portions radially mounted on the front side for slidably mounting between the chuck body and the chuck body in a state where the jaws are cam-connected to the jaws. The jaw is slid inward and outward by sliding in the front-rear direction in a plunger slide space provided inside, so that the connection and release of the cam connection are switched with the sliding of the wedge plunger. The safety pin is slidable in the front-rear direction and the chuck is The wedge plunger is housed inside the slide, and along with the slide of the wedge plunger, a position between a retaining position for preventing the jaw from coming out of the jaw mounting portion and a retaining release position for preventing the jaw from being released. A safety pin is configured to slide, and the safety pin is configured to slide from the retaining position to the retaining release position when the wedge plunger slides in a direction in which the cam connection is released, A chuck device is provided.

In the configuration of the present invention, the jaws can be prevented from coming off by disposing the safety pin at the retaining position. Further, since the safety pin slides along with the sliding of the wedge plunger, a device for sliding the safety pin is unnecessary, and the jaw automatic exchanging device does not become complicated or large.

Preferably, in the chuck device described above, when the wedge plunger slides in the front-rear direction in the front section in the plunger slide space, the cam connection is maintained, and the jaw is attached to the jaw mounting portion. When the wedge plunger is slid to a rear section in the plunger slide space while sliding inward and outward along the plunger, the cam connection is released, and the jaw is mounted without interference of the jaw with the wedge plunger. When the wedge plunger is present in the front section, the safety pin is located at the retaining position, and the safety pin is located in the front section from the front section to the rear section. When the wedge plunger slides, the slide Emissions is configured to slide until stopper release position wherein a chuck device.

Preferably, in the chuck device described above, a rear pressing portion P1 for pressing the safety pin rearward is provided on the wedge plunger or another member integrally fixed to the wedge plunger. The rear pressed portion P2 pressed by the portion P1 is provided on the safety pin or another member integrally fixed thereto, and when the wedge plunger is in the front section, the rear pressed portion P1 and the When the rear pressed portion P2 is not in contact with the safety pin is located at the retaining position and the wedge plunger slides from the front section to the rear section, the rear pressing section P1 is The safety pin is brought into contact with the rear pressed portion P2 from the front and presses the rear pressed portion P2 rearward directly or via another member, whereby the safety pin is moved. Configured to serial retaining the slide to the release position, a chuck device.

Preferably, in the chuck device described above, in the retaining position, the front end of the safety pin is inserted into a safety pin insertion recess provided on a rear surface side of the jaw, and in the retaining release position, A chuck device wherein a front end of the safety pin is not inserted into the safety pin insertion recess.
Preferably, in the chuck device described above, the safety pin is provided at a safety pin main body, a rear shaft extending rearward from a rear end surface of the safety pin main body, and a rear end of the rear shaft. The wedge plunger is provided behind the cam connecting portion and the cam connecting portion that is cam-connected to the jaw, and the rear shaft portion of the safety pin is inserted. A chuck device including a wedge plunger main body.

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

Preferably, in the chuck device described above, when the wedge plunger slides from the rear section to the front section, the safety pin is configured to slide to a retaining position with the slide. It is a chuck device.

Preferably, in the chuck device described above, a front pressing part Q1 for pressing the safety pin forward is provided on the wedge plunger or another member integrally fixed thereto, and the front pressing part Q1 is provided. When the front pressed portion Q2 pressed by the portion Q1 is provided on the safety pin or another member integrally fixed thereto, and the wedge plunger slides from the rear section to the front section. Then, the front pressing portion Q1 abuts against the front pressed portion Q2 from behind directly or via another member to press the front pressed portion Q2 forward, whereby the safety pin reaches the retaining position. A chuck device configured to slide.

Preferably, the chuck device described above, further comprising a safety pin holding unit, wherein the safety pin holding unit is configured to be able to hold the safety pin at the retaining position, and the wedge plunger holds the safety pin. A chuck device configured to release the holding of the safety pin at the retaining position when sliding backward.

Preferably, a plurality of jaw mounting portions for slidably mounting a plurality of jaws for gripping a work between an inner position close to each other and an outer position separated from each other are radially provided on a front side of the chuck body. When,
A wedge plunger that is cam-coupled to the jaw attached to the jaw attachment portion, slides in the front-rear direction in a plunger slide space provided inside the chuck body, and thereby slides the jaw in and out.
When the wedge plunger slides back and forth in the front section in the plunger slide space, the cam connection is maintained, and the jaws slide inward and outward along the jaw mounting portion,
When the wedge plunger is slid to the rear section in the plunger slide space, the cam connection is released, and the jaw can be removed outward from the outer end side of the jaw mounting portion without being interfered by the wedge plunger. A chuck device that is in a state,
A safety pin that is inserted into the safety pin insertion recess provided on the rear side of the jaw and prevents the jaw from coming out of the jaw mounting portion is housed inside the chuck body in a state that it can slide in the front-rear direction. As well as
Rear pressing part P ₁ for pressing the safety pin backwards is provided in the wedge plunger,
Rear pressed portion P ₂ which is pressed by the rear pressing portion P ₁ is provided in the safety pin,
When there is a wedge plunger to the front section in the plunger slide space, missing the rear pressing portion P ₁ and rear pressed portion P ₂ is not in contact with the front end of the safety pin is inserted into the safety pin insertion recessed portion While the safety pin is located at the stop position,
When the wedge plunger from the front section to the rear section has been slid in the plunger slide space, the rear pressed portion P ₂ at the rear behind the pressing portion P ₁ abuts against the front relative to the rear pressed portion P ₂ A chuck device is provided in which the safety pin is slid to a retaining release position where the front end of the safety pin comes out of the safety pin insertion recess by pressing.

It is the figure which showed the state which saw the state which attached the jaw to the chuck apparatus which concerns on this invention from the front side. It is a figure showing the chuck device of a first embodiment, and is a figure showing the state where a work is grasped with a jaw. A view showing a chucking device of the first embodiment, the wedge plunger is slid rearward section from the front section of the plunger slide space, and the rear pressing portion P ₁ and rear pressed portion P ₂ is in contact with It is the figure which showed the state of the moment. FIG. 5 is a view showing the chuck device of the first embodiment, showing a state in which the wedge plunger is slid to the retreat end position of the rear section in the plunger slide space, and the safety pin is prevented from coming off the jaw. is there. It is a figure showing the chuck device of a 2nd embodiment, and showing the state where the wedge plunger was slid to the retreat end position of the back section in the slide space for plungers. It is the figure which showed the chuck apparatus of 2nd embodiment, and showed the state which made the wedge plunger slide to the front side section in the slide space for plungers, and made the safety pin slide to the retaining position.

好適 A preferred embodiment of the chuck device of the present invention will be described more specifically with reference to the drawings. Hereinafter, the chuck device according to the first embodiment and the chuck device according to the second embodiment will be described as examples. However, the technical scope of the present invention is not limited to these chuck devices, and can be appropriately changed without departing from the spirit of the invention.

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

1 to 4 are views showing a chuck device 10 according to a first embodiment. 1 shows a state in which the chuck device 10 with the jaw 30 attached is viewed from the front side, FIG. 2 shows a state in which the jaw 30 attached to the jaw attachment portion 11a grips the workpiece W, and FIG. 3 shows a plunger. wedge plunger 15 is slid to the rear section S ₂ from the front section S ₁ of the use slide space alpha, the moment when the rear pressing portion P ₁ and rear pressed portion P ₂ is in contact state, FIG. 4, the plunger respectively show a state in which slide the wedge plunger 15 to the retracted end position of the rear section S ₂ in use slide space alpha. 2-4 is a sectional view taken along a plane including the center line L ₁ of the chuck device 10, the center line L ₁ illustrates only one side (upper side).

The chuck device 10 according to the first embodiment includes a chuck body 11, a wedge plunger 15, and a safety pin 16, as shown in FIG. The wedge plunger 15 is housed in a plunger slide space α provided inside the chuck body 11. The wedge plunger 15 forms a plunger portion together with the member 22 and the like, and is connected to a cylinder device (not shown) provided behind the chuck device 10 via a draw pipe or the like (not shown). By driving this cylinder device, the wedge plunger 15 can be slid in the front-rear direction within the plunger slide space α.

Although 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 connected to a cam connecting portion 15b, a wedge plunger body 15c. It consists of. The cam connecting portion 15b is a portion provided with the cam ridge 15a, and is a portion which is cam-connected to the jaw 30 as described later. On the other hand, the wedge plunger main body 15c is a part provided behind the cam connecting part 15b, and is a part through which a rear shaft part 16b of the safety pin 16 described later is inserted.

Chuck body 11 by an unillustrated rotary drive mechanism (motor etc.), and is capable of rotating around the center line L _1. The front surface of the chuck body 11, as shown in FIG. 1, the jaw attachment portion 11a of the plurality of (three in the figure) is provided radially around the center line L _1. In the chuck device 10 of the first embodiment, are arranged jaw attachment portion 11a in rotational symmetry (rotational symmetry around the center line L _1). A jaw 30 is attached to each jaw attachment portion 11a. These jaws 30 are adapted to be able to slide in and out along the respective jaw mounting portion 11a (the radial direction around the center line L _1). Sliding plurality of jaws 30 inwardly along each of the jaw mounting portion 11a (a direction to approach the center line L _1), while the plurality of jaws 30 approach each other, each jaw mounting portion a plurality of jaws 30 sliding outward (direction away from the center line L ₁₎ along the 11a, so that the plurality of jaws 30 away from each other. By causing the jaw 30 to perform such an operation, an operation of gripping the work W with the jaw 30 and an operation of releasing the work W are performed.

In the chuck device 10 of the first embodiment, the jaw attachment portion 11a is formed by a groove. The groove (jaw mount portion 11a), the jaws 30 are adapted to fit the radial jaws 30 around the inner and outer direction (center line L ₁ by the recessed groove (the jaw attachment portion 11a) ). In the chuck device 10 of the first embodiment, the jaw 30 is configured by the soft jaw 31 that contacts the workpiece W and the master jaw 32 that is connected to the rear surface side of the soft jaw 31. The master jaw 32 is fitted and guided in the concave groove (jaw mounting portion 11a).

A cam groove 32a is provided on a side surface of the master jaw 32 constituting each jaw 30. The cam groove 32a is fitted (cam-coupled) to the cam ridge 15a of the wedge plunger 15. Both cam projections 15a of the cam groove 32a and the wedge plunger 15 of the master jaw 32 is provided in a state of being inclined with respect to the center line L _1. Therefore, when the wedge plunger 15 is slid in the front-rear direction in the plunger slide space α, the movement in the front-rear direction is converted into the movement in the inside and outside directions by the cam mechanism including the cam groove 32a and the cam ridge 15a. , The jaws 30 slide inward and outward.

In addition, the chuck device 10 of the first embodiment is capable of automatically exchanging the jaws 30 with a jaw automatic exchanging device substantially similar to that disclosed in Patent Document 1. For this reason, the jaw attachment portion 11a is provided until it reaches the outer peripheral portion of the chuck body 11, and the jaw 30 attached to the jaw attachment portion 11a can be pulled outward from the outer end of the jaw attachment portion 11a. Like that. The operation of pulling out the jaw 30 from the jaw mounting portion 11a is performed by an automatic jaw changing device. However, as described above, the master jaw 32 of the jaw 30 is in a state where the cam groove 32a provided in the jaw 30 is fitted to the cam ridge 15a of the wedge plunger 15 (the state in which the jaw 30 and the wedge plunger 15 are cam-connected). However, in this state, the jaw 30 cannot be pulled out from the jaw mounting portion 11a in this state.

In this regard, in the chuck device 10 of the first embodiment, when the chuck device 10 performs a chucking operation (an operation of sliding the jaws 30 inward and outward to grip the work W), as shown in FIG. , A front section S ₁ in the plunger slide space α (a section where the cam groove 32a of the master jaw 32 and the cam ridge 15a of the wedge plunger 15 are fitted. In each figure, the position of the rear end face of the wedge plunger 15 is used as a reference. a although the wedge plunger 15 shows a front section S _1.) slides, when replacing the jaw 30 mounted to the chuck device 10, as shown in FIGS. 3 and 4, the slide space α plunger in S _{2 (each} figure rear section in, shows the rear section S ₂ on the basis of the position of the rear end face of the wedge plunger 15 When the wedge plunger 15 is retracted, the engagement between the cam groove 32a of the master jaw 32 and the cam ridge 15a of the wedge plunger 15 is released (the cam connection between the jaw 30 and the wedge plunger 15 is released). ) That is, the connection and release of the cam connection are switched as the wedge plunger 15 slides. This prevents the wedge plunger 15 from interfering with the jaw 30 when the jaw 30 attached to the chuck body 11 is pulled out from the outer end of the jaw attachment portion 11a using the automatic jaw changing device. Is possible.

Incidentally, even if there is a wedge plunger 15 in the front section S ₁ in the slide space α plunger, if there such that the cam groove 32a and the fitting portion by the cam protrusions 15a of the wedge plunger 15 of the master jaw 32 is damaged Thus, the jaws 30 can move along the jaw mounting portions 11a without being interfered by the wedge plungers 15. In this case, there is a possibility that the jaw 30 may fall out of the jaw mounting portion 11a due to gravity. In addition, in the chucking device 10 in the first embodiment, when to rotate the chuck device 10 to the center line L ₁ employs a structure as possible, the centrifugal force when rotating the chuck devices 10 As a result, there is a possibility that the jaws 30 may fall out of the jaw mounting portion 11a and scatter.

For this reason, in the chuck device 10 of the first embodiment, as shown in FIG. 2, a safety pin 16 is attached to the chuck body 11, and a front end of the safety pin 16 is provided on a rear surface side of the jaw 30. It is designed to be inserted into the insertion recess 32b. Although 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 formed by a safety pin main body portion 16a inserted into the safety pin insertion recess 32b, and a safety pin. A rear shaft portion 16b extending rearward from a rear end surface of the main body portion 16a, and a rear enlarged portion 16c provided at a rear end portion of the rear shaft portion 16b. The rear enlarged portion 16c has a structure detachable from the rear shaft portion 16b. By removing the rear enlarged portion 16c, the rear shaft portion 16b can be inserted into the wedge plunger main body 15c. I have.

Safety pin insertion recesses 32b in the jaw 30 is provided in a form having a predetermined length along the inner and outer direction (circumferential direction around the center line L _1). For this reason, when the jaw 30 slides in the normal stroke range (stroke range used when gripping the workpiece W), the safety pin 16 does not interfere with the jaw 30. However, on the other hand, when the jaw 30 is gripping the workpiece W, the fitting portion between the cam groove 32a of the master jaw 32 and the cam ridge 15a of the wedge plunger 15 is damaged, and the jaw 30 and the wedge are damaged. When the cam connection with the plunger 15 is released and the jaw 30 starts to slide toward the outer end side of the jaw mounting portion 11a due to the above-mentioned gravity or centrifugal force, the jaw 30 is inserted into the inner end of the safety pin insertion recess 32b. The front end of the safety pin 16 is caught, preventing the jaw 30 from sliding further outward. Therefore, when the workpiece W is gripped by the jaw 30, even if the fitting portion between the cam groove 32 a of the master jaw 32 and the cam ridge 15 a of the wedge plunger 15 may be damaged, the jaw 30 is not attached to the jaw. It does not get out of the part 11a.

However, as described above, when replacing the jaw 30, it is necessary to pull out the jaw 30 outward from the outer end side of the jaw mounting portion 11a. In this regard, if the safety pin 16 is still inserted into the safety pin insertion recess 32b of the jaw 30 when the jaw 30 is replaced, the safety pin 16 interferes with the jaw 30, so that the jaw mounting portion 11a Can not pull out the jaw 30 from. For this reason, in the chuck device 10 of the first embodiment, the safety pin 16 is supported by the chuck body 11 in a state in which it can be slid in the front-rear direction. Or the state in which the jaws 30 are exchanged), the front and rear positions of the safety pin 16 can be changed.

That is, as shown in FIG. 2, the time (when there is a wedge plunger 15 in the front section S ₁ of the sliding space α plunger) that is holding the workpiece W by the jaws 30, the front end of the safety pin 16 is secure While the safety pin 16 slides forward to a position where it is inserted into the pin insertion recess 32b (retaining position), as shown in FIG. 4, when the jaw 30 is replaced (the rear section of the plunger slide space α). but when there is a wedge plunger 15) in S _2, the front end of the safety pin 16 comes out of the safety pin insertion recess 32b position to (retaining the release position), the safety pin 16 is adapted to slide rearward. The sliding operation 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 a retaining position for preventing the jaw 30 from coming out of the jaw attachment portion 11a and a retaining release position for preventing the jaw 30 from coming out. It is configured as follows.

Specifically, as shown in FIG. 2, the rear pressing portion P ₁ (the rear surface of the wedge plunger body 15 c in the chuck device 10 of the first embodiment) provided on the wedge plunger 15 and the safety pin 16 are provided. When the rear pressed portion P ₂ (in the chuck device 10 of the first embodiment, the front surface of the rear enlarged diameter portion 16c is not in contact), the safety pin 16 slides the wedge plunger 15 in the front-rear direction. although maintaining the state in which also retaining position, as shown in FIGS. 3 and 4, the side section S ₂ to the wedge plunger 15 after the sliding space α plunger is been slid rearward, the rear pressing portion P ₁ When the rear and the pressed part P ₂ is in a state of contact with each other, by the pressing force of the backward exerted from the rear pressing portion P ₁ in the rear pressed portion P _2, the safety pin 16 Wedge plungers 15 and together are adapted to slide rearward. Incidentally, the rear pressing portion P ₁ may be provided on another member that is integrally fixed to the wedge plunger 15, the rear pressed portion P _2, in addition to the member which is integrally fixed to the safety pin 16 It may be provided.

Therefore, in order to exchange the jaws 30, the wedge plunger 15 rearward section S ₂ from the front section S ₁ of the sliding space α plunger is slid rearward, with the rear of the slide of the wedge plunger 15, The safety pin 16 is automatically retracted to the retaining 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 retaining position to the retaining release position.

A safety pin front urging member 19 for urging the safety pin 16 forward is provided on the rear side of the safety pin 16. Therefore, the wedge plunger 15 in the rear section S ₂ is slid forward, the safety pin 16 to follow it also slides forward, as shown in FIG. 2, the rear end outer peripheral portion of the safety pin body portion 16a The safety pin 16 stops at a position where the front surface (safety pin side stopper) of the flange-shaped portion provided on the front surface of the plunger slide space α comes into contact with the front wall surface (chuck body side stopper).

As described above, in the chucking device 10 in the first embodiment, when the sliding to the rear section S ₂ of the wedge plunger 15 from the front section S ₁ of the sliding space α plunger, the safety pin 16 is retaining position It slides automatically to the retaining release position.

Also, the safety pin 16 is not completely integrated with the wedge plunger 15 (rather than employing a structure in which the safety pin 16 and the wedge plunger 15 always slide integrally), but slides in the front-rear direction. the safety pin 16 and the wedge plunger 15 which is configured separately to allow, only when the rear pressing portion P ₁ and rear pressed portion P ₂ is in contact with, adopting a structure that integrally slides Thereby, 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. For this reason, the depth (depth in the front-back direction) of the recess 32b for inserting the safety pin can be made small, and the front-back length of the chuck body 11 can be suppressed. As a result, it is possible to maintain the bending rigidity of the chuck device high, shorten the work processing time, and widen the work processing range.

2. Chuck Device of Second Embodiment Subsequently, a chuck device 10 of a second embodiment will be described.

5 and 6 are views showing the chuck device 10 according to the second embodiment. Figure 5 is a state in which slide the wedge plunger 15 to the retracted end position of the rear section S ₂ of the slide space α plunger, FIG. 6, the slide wedge plunger 15 to the front section S ₁ in the slide space α plunger And the safety pin 16 is slid to the retaining position. 5 and 6 are cross-sectional views taken along a plane including the center line L ₁ of the chuck device 10, the center line L ₁ illustrates only one side (upper side).

In chuck device 10 of the first embodiment, but when there is a wedge plunger to the front section S ₁ of the sliding space α plunger (when gripping a workpiece W in the jaws 30), the rear pressing portion P ₁ and rear pressed portion P ₂ and is not in contact with the safety while pin 16 is in the retaining position, when the wedge plunger 15 from the front section S ₁ of the sliding space α plunger to the rear side section S ₂ has been slid in (jaws 30 when) sliding the wedge plunger 15 rearwardly for replacement, by the rear pressing portion P ₁ pushes the rear pressed portion P ₂ abuts from the front relative to the rear pressed portion P ₂ at the rear, The safety pin 16 slides to the retaining release position. This operation is the same in the chuck device 10 of the second embodiment. In the following, the chuck device 10 according to the second embodiment will be described focusing on a configuration different from the chuck device 10 according to the above-described first embodiment. The configuration that does not particularly refer to the chuck device 10 of the second embodiment can employ the same configuration as the chuck device 10 of the first embodiment.

In the above-described chuck device 10 of the first embodiment, as shown in FIG. 2, the safety pin 16 is urged forward by the safety pin front urging member 19 disposed on the rear side of the safety pin 16. By the urging force of the front urging member 19 of the safety pin, the safety pin 16 at the retaining release position (FIG. 4) returns to the retaining position (FIG. 2). In contrast, in the chucking device 10 in the second embodiment, as shown in FIGS. 5 and 6, the front pressing portion Q ₁ provided in the wedge plunger 15, the front pressed portion Q ₂ to which is provided the safety pin 16 by pressing the front pressed portion Q ₂ forwardly abuts retaining release position safety pin 16 retaining position in (Fig. 5) is adapted to return to (Fig. 6). Incidentally, the front pressing portion Q ₁ is, may be provided on another member that is integrally fixed to the wedge plunger 15, the front pressed portion Q ₂ is, in addition to the member which is integrally fixed to the safety pin 16 It may be provided.

Thus, contact of the chuck device 10 of the second embodiment, (returning operation to the retaining position) sliding movement of the front of the safety pin 16, the front pressing portion Q _1, the front pressed portion Q ₂ It is to be done by. For this reason, in the chuck device 10 of the second embodiment, the safety pin front urging member 19 can be omitted. Whether providing a forward pressing portion Q ₁ and the front pressed portion Q ₂ anywhere in the wedge plunger 15 and a safety pin 16, respectively, but not limited to, the chuck device 10 of the second embodiment, the wedge plunger body portion 15c front front pressing portions Q _1, and the rear face of the safety pin body portion 16a is set to be the front pressed portion Q _2.

Further, the chuck device 10 of the second embodiment, even when there is a wedge plunger 15 in the front section S1, the wedge plunger 15 slides rearward in contact with the front pressing portion Q _1, the front pressed portion Q ₂ is brought If it disappears, the safety pin 16 will be able to slide backward. For this reason, there is a possibility that the safety pin 16 may move from the retaining position due to vibration or the like generated in the chuck device 10. Therefore, in the present embodiment, safety pin holding means for holding the safety pin 16 at the retaining position is provided. In the chuck device 10 of the second embodiment, as shown in FIG. 6, the safety pin holding means includes a position holding member provided on the outer periphery of the safety pin 16 (more precisely, on the outer periphery of the safety pin main body 16a). The groove 16 a ₁ , the position holding fitting 20 for fitting into the position holding groove 16 a _1, and the fitting body urging member 21 for biasing the position holding fitting 20 toward the safety pin 16. Make up. When the safety pin 16 slides to the retaining position (FIG. 6), the safety pin holding means engages with the position holding fitting 20 in the position holding groove 16 a ₁ , thereby pulling out the safety pin 16. It is held at the stop position.

Position holding grooves 16a _1, in addition to the inner wall surface is provided to be inclined, assembly 20 fit for holding the position is assumed spherical. In the chuck device 10 of the second embodiment, the position holding fitting 20 is made of a steel ball. Therefore, in order vibration generated in the chuck device 10, without fitting body 20 is out of a position holding from the groove 16a ₁ for holding the position, but is held in locking position missing safety pin 16, the wedge plunger 15 rearwardly slide, a state in which the rear pressing portion P ₁ is in contact with the rear pressed portion P _2, when the pressing force of the rearward is applied to the safety pin 16 from the wedge plunger 15, fitted for holding the position from the groove 16a ₁ for holding the position The union 20 comes off. In other words, when a rearward pressing force is applied to the safety pin 16 from the wedge plunger 15, the holding of the safety pin 16 at the retaining position is released, and the safety pin 16 can slide backward. ing. Position holding grooves 16a _1, because provided annularly along the entire circumference of the outer peripheral portion of the safety pin body portion 16a, also as a safety pin 16 is rotated about its centerline, fit for holding the position coalesce 20 is adapted to be able to fit in the groove portion 16a ₁ for holding the position.

As described above, the chuck device 10 according to the second embodiment does not require the provision of the safety pin front urging member 19, and therefore requires a space for providing the safety pin front urging member 19 behind the safety pin 16. It is not necessary to secure them. For this reason, the chuck device 10 of the second embodiment can keep the front-rear length of the chuck body 11 short and maintain the bending rigidity of the chuck device 10 high as compared with the chuck device 10 of the first embodiment. It has the advantage that.

3. Other embodiments and backward pressing part P ₁ and the front pressing portion Q ₁ is, respectively, the wedge plunger 15 in any of the safety pin 16 through another member which is not integrally fixed rear pressed and portion P ₂ and forward the pressed portion Q ₂ may be pressed.
The jaw 30 may be provided with a protrusion instead of the safety pin insertion recess 32b, and when the jaw 30 is about to come off, the protrusion may be brought into contact with the safety pin 16 to prevent the jaw 30 from coming out.

: 10: chuck device, 11: chuck body, 11a: jaw mounting portion, 15: wedge plunger, 15a: cam ridge, 15b: cam connecting portion, 15c: wedge plunger body, 16: safety pin,: 16a: safety pin main body,: 16a _1: groove for holding the position,: 16b: rear shaft part,: 16c: rear enlarged-diameter portion, 19: safety pin forward biasing member,: 20: position holding : 21: Fitting member biasing member,: 22: Plunger constituent member,: 30: Jaw,: 31: Soft jaw,: 32: Master jaw,: 32a: Cam groove,: 32b: Safety pin insertion use recess: 40: jaw working portion of the jaws autochanger,: _{P 1:} the rear pressing portion: _{P 2:} rear pressed portion,: _{Q 1:} front pressing portion: _{Q 2:} front pressed part,: S ₁ : front section,: S ₂ : Rear section,: W: Work, α: Slide space for plunger

Claims

A plurality of jaws for gripping a workpiece, a chuck body, a wedge plunger, a chuck device including a safety pin,
The chuck body includes a plurality of jaw mounting portions radially mounted on a front surface side for mounting the plurality of jaws slidably between an inner position close to each other and an outer position separated from each other,
The wedge plunger is configured to slide the jaw in and out by sliding forward and backward in a plunger slide space provided inside the chuck body while being cam-connected to the jaw. And
With the slide of the wedge plunger, the connection and release of the cam connection is configured to be switched,
The safety pin is housed inside the chuck body so as to be slidable in the front-rear direction,
As the wedge plunger slides, the safety pin slides between a retaining position that prevents the jaw from coming out of the jaw mounting portion and a retaining release position that does not prevent the jaw from coming out. Composed,
A chuck device configured to slide the safety pin from the retaining position to the retaining release position when the wedge plunger slides in a direction in which the cam connection is released.
The chuck device according to claim 1, wherein
When the wedge plunger slides in the front-rear direction in the front section in the plunger slide space, the cam connection is maintained, and the jaws slide inward and outward along the jaw mounting portion,
When the wedge plunger is slid to the rear section in the plunger slide space, the cam connection is released, and the jaws are moved outward from the outer end side of the jaw mounting portion without being interfered by the wedge plunger. It can be removed,
When the wedge plunger is in the front section, the safety pin is located at the retaining position,
A chuck device configured such that when the wedge plunger slides from the front section to the rear section, the safety pin slides to the retaining release position with the sliding.
The chuck device according to claim 2, wherein
Said safety pin and the rear pressing portion P 1 for pressing the rear, the wedge plunger or to provided other members which are integrally fixed,
The rear pressing portion rear pressed portion P 2 which is pressed by P 1 is, the safety pin or its provided to other member which is integrally fixed,
Wherein when there is the wedge plunger to the front section, located in the rear pressing portion P 1 and said rear pressed portion P 2 is not in contact with the safety pin missing the stop position,
Wherein when the wedge plunger from the front section to said rear section has been slid, the rear pressing portion P 1 abuts against the rear pressed portion P 2 directly from the front to the rear pressed portion P 2 Alternatively, the chucking device is configured to slide backward to the retaining release position by pressing backward through another member.
The chuck device according to any one of claims 1 to 3, wherein
At the retaining position, the front end of the safety pin is inserted into a safety pin insertion recess provided on the rear surface side of the jaw,
The chuck device, wherein the front end portion of the safety pin is not inserted into the safety pin insertion recess at the retaining release position.
The chuck device according to any one of claims 1 to 4, wherein
The safety pin includes a safety pin main body, a rear shaft extending rearward from a rear end surface of the safety pin main body, and a rear enlarged portion provided at a rear end of the rear shaft.
A chuck device, wherein the wedge plunger includes a cam connecting portion that is cam-connected to the jaw, and a wedge plunger main body portion provided behind the cam connecting portion and through which a rear shaft portion of the safety pin is inserted. .
The chuck device according to any one of claims 1 to 5, wherein
A chuck device provided with a safety pin front urging member for urging the safety pin forward.
The chuck device according to claim 2, wherein
A chuck device configured such that when the wedge plunger slides from the rear section to the front section, the safety pin slides to a retaining position with the sliding.
The chuck device according to claim 7, wherein
Said safety pin to the front pressing portion to Q 1 for pressing forward, the wedge plunger or to provided other members which are integrally fixed,
The front pressing portion Q front pressed portion Q 2 to which is pressed by a 1, the safety pin or its provided to other member which is integrally fixed,
When the wedge plunger to the front section from the rear section comes to slide forward the contacts directly or via another member from the rear relative to the front press portion Q 1 is forward pressed portion Q 2 by pressing the pressing portion Q 2 forward, configured such that the safety pin is slid to the retaining position the chuck device.
The chuck device according to any one of claims 1 to 8, wherein
With safety pin holding means,
The safety pin holding means is configured to be able to hold the safety pin at the retaining position, and to hold the safety pin at the retaining position when the wedge plunger slides the safety pin backward. A chuck device configured to release the chuck.