JPH06706A - Chuck device - Google Patents

Abstract

PURPOSE:To provide a chuck device which reliably holds a work in a desired position and prevents the end face of a work from levitation from a reference plane. CONSTITUTION:Claw members 10 are arranged to a body part 20 in a manner to be positioned facing a plurality of respective guide parts 22 arranged toward the axis of the body part 20. By extending a plurality of the claw members 10 along the guide part 22, the claw members are reciprocated toward the axis of the body part 20. By interlocking a plurality of the claw members 10 such that the claw members are caused to effect approximately the same reciprocation, the work 1 is held as centering of the work 1 is carried out. In a so formed chuck device, the guide part 22 has a gradient relative to a surface which crosses the axis of the body part at right angles.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chuck device,
More specifically, the present invention relates to an automatic centering type chuck device that has a plurality of interlocking claw members and holds the held member while centering the held member.

[0002]

2. Description of the Related Art Conventionally, as a chuck device, for example, three claw members 50 are provided with respect to an axis of a main body 60 at respective positions that divide the circumference into three equal parts as shown in FIGS. There is an automatic centering type chuck device which is provided so as to be capable of reciprocating in a direction orthogonal to each other.

This chuck device, as shown in FIG.
Three bevel pinions 72 are arranged at positions where the circumference of the main body 60 is divided into three equal parts. By appropriately rotating the bevel pinion 72, the scroll 70 having the spirally-shaped uneven portion can be rotated. In addition, a slide portion 52 that is provided in a streak shape is provided on the side surface of the claw member 50. It is slidably fitted on the portion 62. Thereby, the claw member 50
Are guided so that they can reciprocate in a direction perpendicular to the axis of the main body 60. And the scroll 7 above
As shown in FIG. 6, 0 engages with the uneven portion provided on the back surface of the claw member 50, and the operation of the scroll 70 allows the claw member 50 to reciprocate in the direction in which the held member is held.

With this conventional chuck device, the axis of the main body 60 and the axis of the held member are made to coincide with each other, and the main body 60
6 shows a case in which the held member positioned by abutting against the abutting surface 68 of the stopper portion 66 provided in FIG.
Also, description will be given based on the principle diagrams of FIGS. 8 and 9. In addition,
FIG. 8 shows a state immediately after the claw member 50 contacts the held member 1 in the conventional chuck device, and FIG. 9 shows a state in which the held member 1 is held by the conventional chuck device. The held member is held by moving the claw member 50 by rotating the scroll 70 that meshes with the uneven portion provided on the back surface of the claw member 50, but abuts the uneven portion and the held portion of the claw member 50. There is a predetermined space between the contact portion. That is, the acting position where the acting force of the scroll 70 acts on the claw member 50 is deviated from the acting position of the reaction force applied to the claw member 50 from the held member. Further, between the slide portion 52 provided on the pawl member 50 and the guide portion 62 provided on the main body portion 60, there is some play required for the pawl member 50 to be reciprocally movable.

Therefore, the pawl member 50 is brought into contact with the held member 1 by the driving force of the scroll 70, and then the held member 1 is held.
Until the holding force A for holding the holding member 1 is obtained, the abutting portion of the abutting member 50 of the claw member 50 has the sliding portion 62 as a fulcrum, due to the reaction force −W generated in the held member 1. 6
Rotate in the direction away from 8. At this time, the frictional force μW generated by the W with which the claw member 50 presses the held member
Acts in a direction of separating the held member from the contact surface 68. Therefore, when the held member 1 is held with the predetermined holding force A by the claw member 50, the held member 1 is lifted from the corresponding contact surface 68 as shown in FIG. On the other hand, conventionally, the held member 1 which is a workpiece
The held member 1 is held at a predetermined position by hitting with a hammer to bring it into contact with the contact surface 68 of the stopper 66 which is the reference surface.

[0006]

According to this conventional chuck device, it is possible to hold the held member while centering it so that its axis coincides with the axis of the main body 60. However, with this chuck device, it is difficult to reliably contact the workpiece, which is the held member, with the contact surface 68 of the stopper 66, and the workpiece chucked in this manner has a high axial dimension. It was difficult to process with the processing accuracy, and the work efficiency was poor. When the slide portion 52 of the claw member 50 is worn and the play between the slide portion 52 and the guide portion 62 is increased, the above-mentioned amount of lifting is increased and the processing accuracy of the workpiece is further reduced.

Therefore, an object of the present invention is to provide a chuck device capable of reliably holding a held member at a desired position and preventing the end surface of the held member from rising from a reference surface. .

[0008]

In order to achieve the above object, the present invention has the following constitution. That is, in the chuck device of the present invention, the main body portion is provided with the claw member corresponding to each of the plurality of guide portions provided toward the axial center of the main body portion, and the plurality of claw members are provided in the guide portion. It is possible to reciprocate toward the shaft center of the main body by aligning it, and the plurality of claw members are interlocked so as to make substantially the same reciprocating motion, so that the held member is centered and held. A chuck device for holding a member is characterized in that the guide portion is provided at a predetermined gradient with respect to a plane orthogonal to the axis of the main body portion.

[0009]

According to the chuck device of the present invention, each of the plurality of guide portions is provided in the main body portion at a predetermined inclination with respect to the plane orthogonal to the axis of the main body portion, and each claw member corresponds to each of the guide portions. It is mounted on the guide part so that it can reciprocate. Therefore, the plurality of claw members can move along a predetermined gradient in the direction orthogonal to the axis of the main body when moving in the direction of holding the held member. Thus, the held member can be held while being forcedly brought into contact with a reference surface such as a predetermined stopper.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. 1 is a side view including a partial cross-section showing an embodiment of a chuck device according to the present invention, and FIG. 2 is a cross-sectional view showing an operating state of FIG. 3 shows a state immediately after the claw member 10 contacts the held member 1 in the chuck device according to the present invention, and FIG. 4 shows the held member 1 held by the chuck device according to the present invention. It shows the state. This chuck device is similar to the above-mentioned conventional chuck device, and uses the scroll 30 to dispose a plurality of claw members 1 arranged on the main body 12.
It is a chuck device that can reciprocate 0. On both side surfaces of the claw member 10, slidably protruding slide portions 12 are provided at a predetermined angle with respect to a plane orthogonal to the axis of the main body 20 to be mounted.

Further, as shown in FIG. 2, the main body portion 20 is provided with a guide portion 22 recessed in a groove shape at a predetermined angle with respect to a plane orthogonal to the axis thereof. There is. The guide portion 22 is provided so as to enter the inside of the main body portion 20 as it extends toward the axis of the main body portion 20. The convex portion of the slide portion 12 is slidably fitted in the concave portion of the guide portion 22. Thereby, the claw member 1
0 is guided so as to be able to reciprocate along a gradient of a predetermined angle with respect to the axis of the main body 20.

Further, as shown in FIG. 1, a scroll 30
Has a concavo-convex portion formed in a spiral shape on an inner slope of a mortar shape provided corresponding to the gradient of the slide portion 12 and the guide portion 22. An uneven portion is provided on the back surface of the claw member 10 that is provided in a sloped shape corresponding to the uneven portion of the scroll 30. The scroll 30 and the claw member 10 mesh with each other by the concave and convex portions provided on both sides, and the claw member 10 can be reciprocally driven along the gradient of the predetermined angle by the operation of the scroll 30.

Next, the operating state when the held member 1 is gripped by this embodiment will be described. First, the held member 1 is moved along the axis of the main body 20 to
The contact surface 28 of the stopper portion 26 provided at the position is brought into contact with and positioned. Then, the scroll 30 is rotated by the bevel pinion to drive the plurality of claw members 10 in the direction in which the held member 1 is gripped. Since the plurality of claw members 10 are interlocked with each other by the scroll 30, the plurality of claw members 10 move in the central direction of the main body 20 so as to perform substantially the same operation and hold the held member 1 while centering it.

The pawl member 10 moves in the axial direction along the gradient of the guide portion 22 via the slide portion 12 and holds the held member 1. At this time, the slide portion 12 provided on the claw member 10 is provided by the driving force of the scroll 30 until the holding force P for holding the held member 1 is obtained after the claw member 10 contacts the held member 1. And 20 on the body
There is some play between the guides 22 provided on the. Therefore, as described above, the held member 1 is moved in the direction away from the contact surface 28 by the frictional force μW. At the same time, as shown in FIG.
It is moved so as to come into contact with the contact surface 28 by the gradient of 2. In the chuck device according to the present invention, the held member 1 is moved so as to come into contact with the contact surface 28 due to the inclination of the guide portion 22, and is separated from the contact surface 28 by friction μW. It is set to be larger than the motion that is moved. As a result, the held member 1
Is, as shown in FIG.
Thus, the stopper portion 26 is held in a state in which it is reliably brought into contact with the reference surface which is the contact surface 28 of the stopper portion 26. Therefore, according to the present embodiment, when the workpiece is gripped, the workpiece can be processed with high processing accuracy in the axial dimension.

FIG. 5 is a side view including a partial cross section showing an embodiment in which the present invention is applied to a chuck device for opening and closing a claw member by a driving force of a cylinder device. In this chuck device, a groove-shaped guide portion 4 is provided at the tip of a connecting member 40 that is connected to a cylinder device driven by hydraulic pressure or air pressure, and is provided as a recess with a predetermined slope.
2, a convex sliding portion 16 provided on the claw member 14 with a predetermined gradient is slidably fitted. Further, similarly to the chuck device using the scroll described above, the sliding portion 15 of the claw member 14 is slidably fitted to the guide portion provided on the main body portion 25 with a predetermined inclination, whereby the claw member 14 is It is reciprocally movable along the guide portion. Therefore, when the connecting member 40 moves to the left in the drawing of FIG. 3, the sliding portion 16 is slidably fitted in the guide portion 42, so that the claw member 14 has a slope provided on the main body portion 25. By moving along the guide portion, the held member 1 can be held while being pulled leftward. With this, it is possible to obtain the same effect as that of the chuck device using the scroll.

In the above embodiment, the claw member can reciprocate only along a preset constant gradient, but the present invention is not limited to this, and the gradient can be appropriately changed and adjusted. Good. With this, it is possible to appropriately and selectively set the balance relationship between the operation generated by applying the gradient described above and the operation of lifting the held member by μW described in the section of the prior art, and corresponding to various conditions. can do.

Further, in the above embodiment, the inclination of the guide portion is provided so as to enter the inside of the main body portion toward the axial center of the main body portion. In order to forcibly abut the reference surface provided on the guide, the slope of the guide portion can be provided in the opposite direction. For example, when the claw member contacts the inner peripheral surface of the held member to hold the held member, the held member can be appropriately brought into contact with a reference surface provided outside. Further, as shown in FIGS. 1, 2 and 5, the top jaw, which is the contact portion of the claw member that comes into contact with the held member, is detachably provided on the master jaw and variously changed according to the held member. Of course you can. The chuck device according to the present invention can be used not only for holding a workpiece in a processing machine such as a lathe, but also for various applications for holding a held member. Although various preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and many modifications can be made without departing from the spirit of the invention. That is.

[0018]

According to the chuck device of the present invention, the held member is held while the end surface of the held member is forcibly brought into contact with the contact surface which is the reference surface of the stopper or the like provided in the main body. can do. For this reason, when the workpiece, which is the held member, is held by the chuck device of the present invention, the workpiece can be easily and surely held at a predetermined position, and the workpiece is machined with high machining accuracy in the axial dimension. It has the remarkable effect of being able to

[Brief description of drawings]

FIG. 1 is a side view including a partial cross-section showing an embodiment of a chuck device according to the present invention.

FIG. 2 is a sectional view showing an operating state of the embodiment of FIG.

3 is an explanatory diagram before holding for explaining the operating principle of the embodiment of FIG.

FIG. 4 is an explanatory diagram after holding for explaining the operating principle of the embodiment of FIG.

FIG. 5 is a side view including a partial cross section showing another embodiment of the present invention.

FIG. 6 is a side view including a partial cutaway showing a conventional technique.

FIG. 7 is a perspective view showing a conventional technique.

FIG. 8 is an explanatory diagram before holding for explaining an operating principle of a conventional technique.

FIG. 9 is an explanatory diagram after holding for explaining an operating principle of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Held member 10 Claw member 12 Slide part 20 Main body part 22 Guide part 26 Stopper part 28 Abutment surface 30 Scroll

Claims (1)

[Claims] 1. A main body part is provided with a claw member corresponding to each of a plurality of guide parts provided toward an axis of the main body part, and the plurality of claw members are arranged along the guide part. The plurality of claw members are reciprocally movable toward the axial center of the main body, and the plurality of claw members are interlocked to perform substantially the same reciprocating movement, thereby holding the held member while centering the held member. In the chuck device, the guide part is provided with a predetermined gradient with respect to a plane orthogonal to the axis of the main body part.