JPH091490A - Chuck mechanism - Google Patents

Abstract

PURPOSE: To detect that a workpiece is chucked precisely by means of chuck jaws so as to precisely and smoothly transfer the workpiece to the next process. CONSTITUTION: When a piston member 44 is slid forward to a cylinder member 43, respective chuck jaws 55 connected to the piston member 44 are moved to the limit position on the outside in the radial direction by means of a connecting body 48 and an operation lever 56. Subsequently, the piston member 44 is slid backward when a fact that a workpiece is inserted into the respective chuck jaws 55 is detected by means of proximity switches 61a, 61b in a workpiece position sensor means, and the workpiece is chucked by means of the respective chuck jaws 55. In this way, one proximity switch 62b in a chuck sensor means is operated, while the other proximity switch 62a is not operated. If the workpiece is not precisely chucked by means of the respective chuck jaws 55, both of the proximity switches 62a, 62b are operated or not operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chuck mechanism used for chucking a work in an apparatus or the like for carrying the work to various automatic machine tools for automatically performing machining work, assembly work and the like In particular, the present invention relates to a chuck mechanism that chucks a work with three chuck claws.

[0002]

2. Description of the Related Art In a device for conveying a work to various automatic machine tools, a chuck mechanism for chucking the work is used. The work chuck mechanism is disclosed in, for example, Japanese Patent Laid-Open No. 5-337872. This chuck mechanism is provided with three chuck claws that move in the radial direction and move toward and away from each other. When a workpiece is inserted into each chuck claw in a concentric state with respect to each chuck claw, each chuck claws By approaching each other, each chuck claw chucks the work.

Further, the chuck mechanism is provided with a sensor means for detecting that the work is not inserted into each chuck claw, and the sensor means accurately detects the work for each chuck claw. When it is detected that the work cannot be chucked without being positioned at, the approach of the chuck mechanism to the work is stopped,
It is designed to prevent damage to each chuck claw and the like.

[0004]

In such a chuck mechanism, although the sensor means detects that the relative position between each chuck claw and the work is inappropriate, whether the work is chucked by each chuck claw. It cannot be detected. Therefore, even though each chuck claw does not chuck the work,
There is a possibility that the work is conveyed to the machine tool or the like and the workpiece is idly fed. When such an idling operation is performed, not only the efficiency of the transfer work is significantly reduced, but also when the workpiece is continuously delivered to the machine tool, the work efficiency by the machine tool is also reduced. I will let you.

The present invention solves such a conventional problem, and an object of the present invention is to detect that a work is chucked by each chuck claw for chucking the work and to perform the idle feeding of the work or the like. It is to provide a chuck mechanism that can be surely prevented.

[0006]

SUMMARY OF THE INVENTION A chuck mechanism of the present invention includes a cylindrical casing, an inner cylinder slidably disposed inside the casing in a biased state, and concentrically fixed in the inner cylinder. A cylinder member, a piston member slidably arranged in the cylinder member, and one end face of the casing, which are arranged at equal intervals in the circumferential direction so as to be movable in the radial direction. And the chuck claws are connected to each other so that the chuck claws move in the radial direction to chuck the work, and the piston claws slide to integrally move the chuck claws in the radial direction. In order to detect the relative position of the workpiece with respect to the connecting means and each chuck claw, two relative axial positions of the casing and the inner cylinder are detected. A pair of work position sensor means provided as described above, and two positions of the piston member with respect to the cylinder member are respectively detected in order to detect a state where the work is chucked by each chuck claw and a state where the work is not chucked. And a pair of chuck sensor means provided in the above. The above-mentioned object is achieved thereby.

[0007]

In the work chuck mechanism of the present invention, when the work is fitted to each chuck claw, the inner cylinder is pressed by the work and the inner cylinder is slid by a predetermined distance with respect to the casing. When the work position sensor means detects such a state, the piston member slides with respect to the cylinder member fixed in the inner cylinder. When the work is not at the predetermined position with respect to each chuck claw, the slide distance of the inner cylinder with respect to the casing increases, and the work position sensor means detects such a state. When each work for each chuck claw is in a predetermined position, each chuck claw connected to the piston member by the connecting means moves in the radial direction. Then, the work fitted into each chuck claw is chucked by each chuck claw, and the piston member does not slide with respect to the cylinder member. Such a state is detected by the chuck sensor means. In the state where each chuck claw does not chuck the work, the piston member is further moved with respect to the cylinder member, and such a state is detected by one chuck sensor means.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic perspective view showing an example of a work feeder having a chuck mechanism of the present invention. This work supply device includes a work accommodating device 10 for accommodating a short cylindrical unprocessed work and a processed work, and a work accommodating device 1.
It has a work relay device 20 for taking out and relaying the unprocessed work accommodated in 0, and a work transport device 30 for chucking and transporting the work relayed by the work relay device 20. The work transfer device 30 supplies the work to a machine tool that performs cutting and the like, takes out the processed work processed by the machine tool, and supplies the work relay device 20. The work relay device 20 is also configured to receive the processed work from the work transfer device 30 and relay it to the work storage device 10.

The work accommodating device 10 has an unprocessed work stocker 11 in which column-shaped unprocessed works are stacked vertically and a processed work stocker 12 in which processed works are stacked vertically. ing.

The work relay device 20 is a work accommodating device 1
It has a pair of relay chuck mechanisms 21 arranged to face the unprocessed work stocker 11 and the processed work stocker 12 respectively. Each relay chuck mechanism 21 includes a pair of chuck arms 21 that come into contact with and separate from each other.
a is supported so as to be rotatable from a substantially vertical state as shown in FIG. 1 to a horizontal state corresponding to the unworked work stocker 11 and the worked work stocker 12.

FIG. 2 is a front view of the work transfer device 30. In the work transfer device 30, a slide base 32 is supported on the side surface of the device main body 31 so as to be slidable in the front-rear direction, and the lower end of a vertically extending support arm 33 swings on the front surface of the slide base 32. Supported as possible.
The upper end of the inverted V-shaped swing member 34 is swingably supported on the upper end of the support arm 33.
The swinging member 34 has a pair of swinging arm portions 34 a that extend obliquely downward so as to separate from each other from the upper end portion supported by the support arm 33.
The chuck mechanism 40 of the present invention is provided at the lower end of 4a.

Each swing arm 34a of the swing member 34 swings laterally from the position where the chuck mechanism 40 provided at the lower end of the swing arm 34 faces the relay chuck mechanism 21 of the work relay device 20, respectively. Then, the chuck mechanism 40 on one side faces the chuck mechanism of a machine tool or the like (not shown). Each chuck mechanism 40 provided at the lower end of each swing arm 34a is placed in a state of facing each relay chuck mechanism 21 of the work relay device 20, thereby delivering an unmachined work and a machined work. In addition, the unmachined work and the machined work are delivered by being in a state of facing the chuck mechanism of the machine tool.

FIG. 3 shows the swing arm portion 34 of the swing member 34.
It is a longitudinal cross-sectional view of the chuck mechanism 40 of the present invention attached to the lower end of a. The chuck mechanism 40 has a cylindrical casing 41 horizontally attached to the lower end of the swing arm portion 34a so as to project forward of the swing arm portion 34a, and slidably fitted in the casing 41. It has a combined cylindrical inner cylinder 42.

The rear end surface of the inner cylinder 42 is locked to the rear end surface of the casing 41.
It is fitted to 1 so as to be slidable rearward. In the middle of the inner cylinder 42 in the axial direction, the partition wall portion 4 perpendicular to the axial direction is formed.
2a is provided.

At the rear of the casing 41, there is a support cylinder 51.
Are abutted against the rear end surface of the casing 41 and are concentrically attached. A compression spring 52 is provided between the support cylinder 51 and the inner cylinder 42, and biases the inner cylinder 42 slidable with respect to the casing 41 forward.

A through hole 42b is provided in the central portion of the partition wall 42a provided in the inner cylinder 42.
A cylinder member 43 is fitted in 2b in a penetrating state. The cylinder member 43 is provided with a flange 43a at an end portion on the front side in the projecting direction of the casing 41, and the flange 43a abuts on the partition wall portion 42a and is bolted. Flange 43a of cylinder member 43
The end opposite to the end provided with the end face closing portion 43
It is closed by b.

Inside the cylinder member 43, a hollow piston member 44 is arranged slidably in the axial direction. The front end of the piston member 44 is open, and the opposite end is closed by the end surface closing portion 44a. A cylindrical rod member 45 slidably penetrating a through hole 43c provided in the center of the end surface closing portion 43b of the cylinder member 43 is attached to the center of the end surface closing portion 44a. The outer peripheral surface of the piston member 44 is provided with a packing 44b which is in pressure contact with the inner peripheral surface of the cylinder member 43 and maintains an airtight state. A packing 43d is provided on the inner peripheral surface of the through hole 43c provided in the end surface closing portion 43b of the cylinder member 43 so as to be pressed against the rod member 45 penetrating the through hole 43c to maintain an airtight state. .

The end face closing portion 43b of the cylinder member 43 is provided with a ventilation passage 43e for supplying / discharging compressed air to / from the inside of the cylinder member 43 and the piston member 44. A tube 65 for supplying and discharging air is attached. Then, when compressed air is supplied into the cylinder member 43 via the tube 65, the piston member 44 is pushed forward in the cylinder member 43.

A cylindrical support block 47 is arranged on the front end surface of the cylinder member 43 via a ring-shaped spacer 46. The front end of the piston member 44 arranged in the cylinder member 43 is
3 protrudes forward and is located in the spacer 46. A cylindrical hollow portion 47 a is provided at the axial center of the support block 47 so as to face the piston member 44. The hollow portion 47a has an inner diameter larger than the outer diameter of the piston member 44 and the inner diameter of the spacer 46, and a cylindrical coupling body 48 is arranged inside thereof so as to be slidable in the axial direction.

The front end surface of the connecting body 48 is open, and the opposite end portion is closed by the end surface closing portion 48a. A compression spring 49 is provided in the hollow portion inside.
Is provided. The compression spring 49 urges the connecting body 48 fitted in the hollow portion 47a of the support block 47 toward the hollow portion 47a piston member 44, and causes the end face closing portion 48a of the connecting body 48 to move toward the piston. Member 44
Is pressed against.

An annular fitting groove 48b which is continuous in the circumferential direction is provided on the outer peripheral surface of the connecting body 48.

FIG. 4 is a partially cutaway front view of the chuck mechanism 40 of the present invention. At the front end of the support block 47, three slide grooves 47b radially extending from the axis of the support block 47 are arranged at equal intervals in the circumferential direction. Each slide groove 47b has a support block 47
Is open to the front end face and outer peripheral surface of
The slider 53 is slidably fitted in each slide groove 47b.

The front end portion and the end surface of the support block 47 where the slide grooves 47b are provided are covered with a cylindrical cover member 54. This cover member 54 is
It is slidably fitted in the casing 41, and three through holes 54a arranged corresponding to the respective slide grooves 47b of the support block 47 are provided on the front surface thereof.

On the front surface of the cover member 54, each through hole 54
a and linearly extending along each slide groove 47b 3
Two chuck claws 55 are provided respectively. Each chuck claw 55 has a slider 53 slidably fitted in each slide groove 47b, and a through hole 5 of a cover member 54.
It is attached via 4a. Each chuck claw 55
Moves in unison with the slider 53, and when the chuck claws 55 are moved to the most center side, the chuck claws 55 abut each other at the center position of the cover member 54. It becomes a state.

As shown in FIG. 3, the recess 5 is formed in the rear surface side portion of the slider 53 fitted in each slide groove 47b.
3a are formed respectively.

Each slide groove 47 is formed in the support block 47.
Recesses 47c are continuously provided behind b. Each recess 47c extends rearward so as to be located on the outer peripheral side of the coupling body 48, and inside each recess 47c,
Three L-shaped operation levers 56 are arranged respectively (only one recess 47c and one operation lever 56 are shown in FIG. 3). Each operating lever 56
The bent portion is rotatably supported in the recess 47c, and an operating portion 56a extending radially inward from the bent portion and an operating portion 56b extending forward from the bent portion are respectively provided. Have The operating unit 56b is the same as the operating unit 56a.
It is about twice as long. Then, the operation unit 56a
It is fitted in a fitting groove 48 b provided in the connecting body 48, and the distal end portion of the operating portion 56 b is the recess 53 of the slider 53.
It is fitted in a. Therefore, when the connecting body 48 moves forward, the operating portion 56a of each operating lever 56 moves forward, the operating portion 56b rotates outward in the radial direction, and the slider 53 moves outward in the radial direction.

FIG. 5 is a sectional view taken along line AA of FIG. As shown in FIGS. 3 and 5, the partition wall portion 4 of the inner cylinder 42
Sensing rods 57a and 57b respectively constituting a pair of work position sensor means are attached to the end surface closing portion 43b of the cylinder member 43 penetrating 2a so as to extend rearward. Each sensing rod 57
Are respectively provided at two positions sandwiching the axial center in the end surface closing portion 43b of the cylinder member 43, and are located inside the support cylinder 51 attached to the rear of the casing 41. The one sensing rod 57a is longer than the other sensing rod 57b.

A bolt 58 is attached to the tip of the rod member 45 penetrating the axial center of the end face closing portion 43b of the cylinder member 43 so as to extend rearward. A disk-shaped sensing member 59 that constitutes the chuck sensor means is attached to the.

The support cylinder 51 attached to the rear of the casing 41 is provided with a work position sensor means so as to face the tip portions of the sensing rods 57a and 57b when the sensing rods 57 move rearward. A pair of proximity switches 61a and 61b are provided respectively. The proximity switches 61a and 61b are
The detection surfaces face each other with the detection surfaces facing inward, and when the sensing rods 57a and 57b approach each other, a predetermined signal is output. The rear end surface of the support cylinder 51 to which the proximity switches 61a and 61b are attached is covered with a cover plate 66 so that the proximity switches 61a and 61b are not exposed to the outside.

FIG. 6 is a sectional view taken along the line BB of FIG. As shown in FIG. 6, the support rods 63a and 63b are attached to the end surface closing portion 43b of the cylinder member 43 so as to sandwich the sensing member 59 attached to the tip end portion of the rod member 45 and extend rearward. Has been.
One support rod 63a is longer than the other support rod 63b, and the tip of each support rod 63b is
Proximity switches 62a and 62b constituting chuck sensor means are attached respectively. Each of the proximity switches 62a and 62b is supported in a state of being displaced in the front-rear direction with the detection surface facing inward. Each of the proximity switches 62a and 62b outputs a predetermined signal when the sensing member 59 supported by the rod member 45 faces each other.

In the chuck mechanism having such a configuration, the unprocessed work is chucked by one relay chuck mechanism 21 in the work relay device 20, and the relay chuck mechanism 21
Thus, the work carrier 30 faces one of the chuck mechanisms 40. In such a state, the entire slide base 32 is moved forward so as to approach the work relay device 20.

At this time, in the chuck mechanism 40, the compressed air is supplied from the tube 65 to supply the compressed air into the cylinder member 43, and the piston member 44 located in the cylinder member 43 is pushed forward. Is in a closed state. Therefore, the connecting body 48 also moves forward, and the sliders 53 are respectively moved by the operating levers 56.
The chuck claws 55 have been moved outward in the radial direction, and the chuck claws 55 have been moved to the outer peripheral side on the front surface of the cover member 54. As a result, a cylindrical space is formed inside each chuck claw 55.

As described above, when the piston member 44 is slid forward, the rod member 45 attached to the piston member 44 and penetrating the end face closing portion 43b of the cylinder member 43 is also slid forward together. Then
The sensing member 59 attached to the tip of the rod member 45 is in a state of being detected by the proximity switch 62b of one of the chuck sensor means arranged close to the cylinder member 43. As a result, the supply of the compressed air from the tube 65 is stopped, and the cylinder member 43 is maintained in a state in which the compressed air is filled.

When the entire slide base 32 of the work transfer device 30 moves so as to approach the work relay device 20,
When the work chucked by the relay chuck mechanism 21 of the work relay device 20 and the chuck mechanism 40 of the work transfer device 30 have an appropriate positional relationship, the work is surrounded by the chuck claws 55. Enter the space. When the slide table 32 of the work transfer device further approaches the work relay device 20, the work contacts the front surface of the cover member 54 and presses the cover member 54.
As a result, the support block 47 is pressed, and the cylinder member 43 integrated with the support block 47 is pressed rearward. Then, the partition 42 a of the middle cylinder 42 is pressed by the cylinder member 43, so that the middle cylinder 42 is moved rearward with respect to the casing 41 against the biasing force of the compression spring 52.

By pressing the cylinder member 43, the middle cylinder 42
When the slides rearward, the longer sensing rod 57a attached to the cylinder member 43 causes the support cylinder 51 to move.
The state is detected by the proximity switch 61a that constitutes one of the workpiece position sensor means attached to the. As a result, the compressed air in the cylinder member 43 is discharged through the tube 65, and the piston member 44 in the cylinder member 43 moves rearward by the biasing force of the compression spring 49.

As the piston member 44 moves rearward, the connecting body 48 also moves rearward, and the operating lever 56 locked to the connecting body 48 rotates. And the operation lever 5
The slider 53 locked by the operating portion 56b of No. 6 is slid toward the inner side in the radial direction, and each chuck claw 55
The end surface on the inner peripheral side of each is pressed against the outer peripheral surface of the workpiece that is in contact with the cover member 54. As a result, the work is chucked by each chuck claw 55.

When the work is chucked by the chuck claws 55, the backward sliding of the connecting body 48 and the piston member 44 is stopped. As a result, the rearward movement of the rod member 45 attached to the piston member 44 is also stopped, and the sensing member 59 attached to the tip of the rod member 45 operates as a chuck sensor means located on the far side of the cylinder member 43. Proximity switch 62a
Stop moving backwards without being detected by. As a result, it is detected that the workpiece is reliably chucked by each chuck claw 55.

At this time, when the chuck claws 55 are not in contact with the work and the work is not chucked, the chuck claws 55 continue to move toward each other, and the piston member 44 moves backward. Keep sliding. Then, together with the piston member 44, the rod member 45 also continues to move rearward, whereby the rod member 4
The sensing member 59 provided at the tip of the No. 5 is detected by the proximity switch 62a of the chuck sensor means arranged on the far side of the cylinder member 43. This allows
The chuck claw 55 detects that the work is not securely chucked. When this happens, for example,
The chucking operation of the work by the chuck claws 55
Repeated.

When the work chucked by the relay chuck mechanism 21 and the chuck claws 55 of the chuck mechanism 40 are not in the concentric state, one of the chuck claws 5
5 is pressed by the work, and the support block 47c covered by the cover member 54 is pressed backward. As a result, the cylinder member 43 integrated with the support block 47 is also pushed rearward via the spacer 46, and the partition wall portion 42a of the middle cylinder 42 in which the flange 43a of the cylinder member 43 is locked is pushed backward. It
As a result, the middle cylinder 42, which is slidable rearward with respect to the casing 41, slides rearward with respect to the casing 41 against the biasing force of the compression spring 52.

When the middle cylinder 42 is slid backward by being pressed by the cylinder member 43, the longer sensing rod 57a mounted on the cylinder member 43 causes the proximity switch of the one work position sensor means mounted on the support cylinder 51. The state is detected by 61a. After that, when the slide base 32 of the work transfer device 30 is moved to be closer to the work relay device 20, the chuck claws 55 of the chuck mechanism 40 are further pressed by the work chucked by the work relay device 20. . As a result, the middle cylinder 42 is pressed by the cylinder member 43 and further slid rearward, and the shorter sensing rod 57b attached to the cylinder member 43 is connected to the other work position sensor means attached to the support cylinder 51. It is detected by the proximity switch 61b.

In this way, when the proximity switch 61b of the work position sensor means detects the sensing rod 61b, the work chucked by the chuck relay device 20 and the chuck mechanism 40 of the work transfer device 30 are in the proper positions. If there is none, it is determined that the work transfer device 30 is in a dangerous state, and the movement of the slide base 32 is stopped. As a result, the chuck mechanism 4 due to the workpiece and the chuck mechanism 40 not being in proper positions.
0 damage is prevented.

When the unworked work is chucked by each chuck claw 55 of the chuck mechanism 40, the work transfer device 3
0 is a chuck mechanism 40 in which an unprocessed workpiece is chucked
Is opposed to the machine tool or the like, and the unmachined workpiece is delivered from the chuck mechanism 40 to the machine tool.

The other chuck mechanism 40 of the work transfer device 30 is opposed to the machine tool, chucks the processed work machined by the machine tool, and is opposed to the work relay device 20. Then, the work is transferred to the relay chuck mechanism 21 of the work relay device 20.

[0044]

As described above, the chuck mechanism of the present invention is as follows.
Only when the pair of work position sensor means detects that the relative position of the workpiece to each chuck jaw is proper, each chuck jaw is operated,
The workpiece is chucked by each chuck claw. Then, whether or not the workpiece is chucked by each chuck claw is detected by the pair of chuck sensor means. Therefore, not only is the damage of the chuck mechanism and the like caused by the workpiece not being in the proper position with respect to each chuck claw being prevented, but also the tooth layer of the workpiece by each chuck claw is prevented. Further, since the work piece is chucked by each chuck claw with high accuracy, even a work having a complicated shape can be reliably chucked by the chuck claw. Further, there is no possibility that the chuck mechanism will be operated in the state where the chuck jaws do not chuck the work, and not only the efficiency of the chuck work is significantly improved, but also the work efficiency of the machine tool that works in conjunction with the chuck mechanism is significantly improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a usage state of a work transfer device provided with a chuck mechanism of the present invention.

FIG. 2 is a front view of the work transfer device.

FIG. 3 is a vertical cross-sectional view of a chuck mechanism of the present invention provided in the work transfer device.

FIG. 4 is a partially cutaway front view of the chuck mechanism.

FIG. 5 is a sectional view taken along line AA of FIG. 3;

FIG. 6 is a sectional view taken along line BB in FIG. 5;

[Explanation of symbols]

 10 Work Storage Device 20 Work Relay Device 30 Work Transfer Device 32 Slide Stand 33 Support Arm 34 Swing Member 40 Chuck Mechanism 41 Casing 42 Inner Cylinder 43 Cylinder Member 44 Piston Member 45 Rod Member 47 Support Block 48 Coupling Body 49 Compression Spring 51 Support Cylinder 52 Compression spring 53 Slider 54 Cover member 55 Chuck claw 56 Operating lever 57a Sensing rod 57b Sensing rod 59 Sensing member 61a Work position sensor means proximity switch 61b Work position sensor means proximity switch 62a Chuck sensor means proximity switch 62b Chuck sensor Means proximity switch

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[Procedure amendment]

[Submission date] August 7, 1995

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction contents]

[0004]

In such a chuck mechanism, although the sensor means detects that the work is not in the inserted state with respect to each chuck claw, whether the work is accurately chucked by each chuck claw. It cannot be detected. Therefore, there is a possibility that a transport operation or the like to the next process may be performed even though the chuck jaws are not accurately chucking the work. In this case, the work cannot be delivered to the machine tool accurately and smoothly, and the chuck mechanism,
The operation of the machine tool, etc. is stopped and the inspection work must be carried out by the worker. As a result, there is a problem that the efficiency of the work transfer work, the work work by the machine tool, etc. is significantly reduced.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

The present invention solves such a conventional problem, and an object of the present invention is to accurately measure a work by each work claw while the work is inserted into each chuck claw for chucking the work. It is an object of the present invention to provide a chuck mechanism capable of detecting that a work is not chucked and preventing the work from being delivered to the next process accurately and smoothly due to the fact that the work is not accurately chucked.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006]

In the chuck mechanism of the present invention, a plurality of chuck claws move integrally with each other in a radial direction in a concentric state with respect to a cylindrical casing to chuck a work, A chuck mechanism in which all the chuck claws can move integrally in the axial direction of the casing, and a pair of work position sensors for detecting the axial position of each chuck claw with respect to the casing, and radiation of each chuck claw with respect to the work. And a pair of chuck sensors for detecting relative positions in the directions.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007]

In the work chuck mechanism of the present invention, when the work is inserted into each of the chuck claws that are in the concentric state, all the chuck claws move integrally with the casing in the axial direction, The pair of work position sensor means detects such a state. When the workpiece is not inserted into the predetermined state for each chuck claw in the concentric state, the axial movement distance of all the chuck claws with respect to the casing is different from the regular movement distance. Is detected by the work position sensor means. When the workpiece is inserted into each chuck claw in a predetermined state, the chuck claws are moved concentrically and integrally in the radial direction. Then, when the work inserted into each chuck claw is in a state of being chucked by each chuck claw, the pair of chuck sensor means move each chuck claw in the radial direction with respect to the work by a predetermined distance. Detects that the work is chucked. When the chuck claws are not chucking the work, the chuck claws have different radial movement distances to the work from the normal state, and such a state is detected by the pair of chuck sensor means. .

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction contents]

As described above, when the piston member 44 is slid forward and moved to the limit position of the sliding, the supply of the compressed air from the tube 65 is stopped and the compressed air is stored in the cylinder member 43. The full state is retained.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0037

[Correction method] Change

[Correction contents]

When the work is accurately chucked by the chuck claws 55, the backward sliding of the connecting body 48 and the piston member 44 is stopped. as a result,
The backward movement of the rod member 45 attached to the piston member 44 is also stopped, and the sensing member 59 attached to the tip of the rod member 45 is positioned between the proximity switches 62b and 62a of the chuck sensor means.
The state is detected by the proximity switch 62b of the chuck sensor means arranged close to the cylinder member 43, and the state is not detected by the proximity switch 62a of the chuck sensor means located on the far side of the cylinder member 43. As a result, the one proximity switch 62b operates and the other proximity switch 62a does not operate, and it is detected that the workpiece is accurately chucked by each chuck claw 55.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction contents]

At this time, the work, which is detected by the proximity switch 61a constituting the work position detecting means to be in the state of being inserted into each chuck claw 55, is placed in a state of being inclined with respect to each chuck claw 55, or the like. If so, each chuck claw 55 cannot chuck the work accurately. In this way, when the chuck claws 55 do not accurately chuck the workpiece, the rod member 45
The sensing member 59 provided at the tip of the chuck sensor means is not located between the proximity switches 62a and 62b of the chuck sensor means and is not detected by the proximity switches 62a and 62b, or the proximity switches 62a.
And 62b. This allows
It is detected that each chuck claw 55 does not chuck the work accurately. In this way, when it is detected that the chuck claws 55 are not chucking the work accurately, the chucking operation of the work by the chuck claws 55 is performed again.
Repeated. Then, again, when the work is not accurately chucked by each chuck claw 55, necessary measures such as an alarm are taken.

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0044

[Correction method] Change

[Correction contents]

[0044]

As described above, the chuck mechanism of the present invention is as follows.
The chuck jaws are moved in the radial direction only when the fact that the workpiece is in the predetermined insertion state with respect to each chuck jaw is detected by the pair of workpiece position sensor means, and each chuck jaw causes the workpiece to move. Is chucked. Then, the fact that the work is accurately chucked by each chuck claw is detected by the pair of chuck sensor means. For this reason, damage to the chuck mechanism and the like due to the work being not properly positioned with respect to each chuck claw is prevented. Further, since it is detected that the work is accurately chucked by each chuck claw, it is possible to confirm whether or not a work having a complicated shape is chucked by the chuck claw. Furthermore, there is no risk that the work transfer work will be performed in the state where the chuck jaws do not chuck the work accurately, and the delivery to the machine tool or the like that works with the chuck mechanism is performed accurately and smoothly, and the work efficiency is remarkable. improves.

Claims (1)

[Claims] 1. A cylindrical casing, an inner cylinder slidably disposed inside the casing, a cylinder member fixed concentrically inside the inner cylinder, and a cylinder member slid into the cylinder member. A piston member that is movably arranged and one end surface of the casing are arranged so as to be movable in the radial direction at equal intervals in the circumferential direction, and each work is chucked by moving in the radial direction. Three chuck claws, connecting means for connecting the piston claws and the chuck claws so that the chuck claws can be moved integrally in the radial direction by sliding the piston claws, and a workpiece for each chuck claw is connected. In order to detect the relative position, a pair of work position sensors provided so as to detect two relative axial positions of the casing and the inner cylinder. Sensor means and a pair of chuck sensor means provided so as to detect two positions of the piston member with respect to the cylinder member in order to detect a state where the work is chucked by each chuck claw and a state where the work is not chucked. A chuck mechanism comprising: