JPH0551514U - High rigidity, high precision air chuck - Google Patents

Abstract

(57) [Abstract] [Purpose] A lathe or other processing or inspection device that has a cylindrical or columnar shape and is capable of holding and rotating with high rigidity and high accuracy even for a work whose cross section is partially cut. Air chuck. [Structure] A piston (4) that advances and retreats by switching compressed air is provided in the casing (3), and an annular pawl retainer (5) that can slide forward and backward is arranged in front of the piston.
Claws (9) (10) that hold the work on the inner circumference in front of the claw retainer
A pair of annular holding members made of elastic material (6) (7)
The front holding member fixes the flange part (18) integrally formed on the outer periphery of the front holding member to the casing, and the rear holding member is slidable forward and elastically restored in the casing by the pressing force of the pawl retainer. In the sandwiched state in which the rear holding member is slidable by a force and the rear holding member is moved forward, both the claws are elastically deformed to reduce the inner diameter of the workpiece and hold the work.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an air chuck having a cylindrical or cylindrical shape for a lathe or other processing or inspecting device and capable of holding and rotating with high rigidity and high precision even a work whose cross section is partially cut. .

[0002]

[Prior Art]

 Conventionally, as a chuck that has a cylindrical or cylindrical shape in a lathe or other processing or inspection device and can hold and rotate even a work whose cross section is partially cut, generally a manually operated type or a pneumatically operated type 4 to 7 is used here, an example is shown in FIGS. 4 to 7 in which the claw for grasping the work is an air chuck using an elastic material and the claw is fully opened by pressurizing the pressure chamber. .

In the conventional air chuck, as shown in the drawing, the outer peripheral portion of the diaphragm 102 made of an elastic material is fixed in an airtight state in the casing 101 to form a pressure chamber 103 therein, and in front of the diaphragm 102. A holding member 105 made of an annular elastic material having a claw 104 having a substantially L-shaped cross section on its inner peripheral portion is fixed by using a flange portion 106 on its outer peripheral portion, and the pressure in the pressurizing chamber 103 is increased. The diaphragm 102 is swollen forward, and the claw 104 of the holding member 105 is pushed forward by a claw retainer 107 which is provided on the front side surface of the diaphragm 102 in an annular shape, and the plurality of slits 108, ... Are radially formed. After pushing 104 out to make it fully open and inserting the work 109 into it, the pressure chamber 103 is depressurized to atmospheric pressure to elastically restore the pawl 104 and reduce the inner diameter, so that the work 109 has elastic properties. It ’s something that you can hold with resilience That.

FIG. 5 shows a state in which the claw 104 is fully opened and a work 109 is inserted therein, and FIG. 6 shows a state in which a work 109 having an outer diameter matching the inner diameter of the claw 104 is held. . Further, FIG. 7 shows a state in which a work 109 having an outer diameter somewhat larger than the inner diameter of the claw 104 is held.

As described above, only when the outer diameter of the work and the inner diameter of the claw are the same, the work and the holding surface of the claw are in surface contact with each other and can be held by the elastic restoring force of the material. When a workpiece with a slightly larger outer diameter is held, the workpiece is held in line contact with a part of the edge of the pawl and cannot be held firmly. In addition, since the work is held only by using the elastic restoring force of the holding member, it is impossible to adjust the holding force, and if part of the side surface of the work is cut, the holding force will weaken. There are drawbacks. Further, since only one holding member is used, the work may be pulled backward by the edge of the claw and the work may be displaced from the fully opened state of FIG. 5 to the held state of FIG. It is impossible to position and mount the work accurately. Further, since the work and the claw of the holding member are in line contact with each other at only one place, there is a drawback that the holding force is weak.

[0006]

[Problems to be solved by the device]

 In view of the above situation, the present invention is to solve the problem in that the work has a cylindrical shape or a cylindrical shape, and a workpiece whose cross section is partially cut has high rigidity and is accurately positioned with high accuracy. The point is to provide an air chuck that can be held and rotated.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention includes a piston that moves forward and backward by switching compressed air in a casing, and an annular pawl retainer that is slidable forward and backward is arranged in front of the piston. In front of the pawl retainer, a pair of annular holding members made of an elastic material having an inner peripheral portion serving as a pawl for holding a work are arranged in the front and rear, and the front holding member has a flange portion integrally formed with the outer peripheral portion of the casing. The rear side holding member can be slid forward in the casing by the pressing force of the pawl retainer and can be slid backward by the elastic restoring force, and both pawls are elastic when the rear side holding member is held forward. In the standby state where the work piece is clamped by deforming and shrinking its inner diameter, and the rear side holding member moves backward, both pawls elastically restore to widen their inner diameter and move away from the work piece. It configures the over chuck.

[0008]

[Action]

 The high-rigidity, high-precision air chuck of the present invention having the above-mentioned contents is a piston driven by compressed air, which elastically deforms a pair of holding members via a pawl retainer, and the two pawls hold two parts of a workpiece. Since it is held by sandwiching it, it can be reliably held, and its holding force can be adjusted by adjusting the pressure of compressed air. Also, since the work piece is held using the pair of holding member claws, even if the claws elastically deform, the work piece is not displaced in the axial direction during the deformation, and the work piece is held in an accurately positioned state. It is possible.

[0009]

【Example】

 The present invention will be further described in detail with reference to the embodiments shown in the accompanying drawings.

1 to 3 show a typical embodiment of an air chuck of the present invention, in which 1 is an air chuck and 2 is a partially cut cylindrical work piece.

The air chuck 1 is provided with a piston 4 that moves forward and backward by switching compressed air inside a casing 3, and an annular pawl presser 5 that can slide forward and backward in conjunction with the piston 4 is arranged in front of the piston 4. A pair of annular holding members 6 and 7 made of an elastic material are arranged forward and backward in front of 5, and the front side holding member 6 has an annular pawl 9 having radially formed slits 8 1 ... The rear side holding member 7 also has a similar annular pawl 10, and the pawls 9 and 10 are elastically compressed by the pressing force of the pawl retainer 5 which is displaced forward as the piston 4 moves forward. The work 2 is deformed and the inner diameter thereof is reduced to hold the work 2.

More specifically, a cylindrical space is provided in the casing 3, and a piston main body 11 of the piston 4 is arranged in the space so as to be slidable back and forth in an airtight state. The front is not a pressure chamber 12, the rear is a pressure chamber 13, and the rod 14 protruding forward in the center of the piston body 11 is projected forward from the partition wall 15 forming the pressure chamber 12 to By introducing compressed air into the chamber 12, the rod 14 moves backward, and by introducing compressed air into the rear pressure chamber 13, the rod 14 moves forward.

A moving space 16 is formed in front of the partition wall 15 for accommodating the pawl retainer 5 so that the pawl retainer 5 can move forward and backward, and the back surface of the pawl retainer 5 arranged in the movable space 16 is pressed by the rod 14. By doing so, it moves forward and the rear holding member 7 is pressed by the annular holding portion 17 provided on the outer peripheral portion so as to project forward.

The front side holding member 6 is integrally formed of an elastic material such as synthetic rubber, or is formed of a metal so as to have an elastic restoring force, and a claw 9 having a substantially U-shaped cross section is formed on the inner peripheral portion. A flange portion 18 is formed on the outer peripheral portion, and the flange portion 18 is positioned between the front end surface of the casing 3 and the annular cover member 19, and the cover member 19 is attached to the casing 3 with bolts 20 ,. It is fixed to the casing 3 by tightening. Further, the front holding member 6 is attached so that the free end side of the claw 9 thereof faces rearward.

The rear side holding member 7 is integrally formed of an elastic material similarly to the front side holding member 6 described above, and a claw 10 having an antisymmetrical cross-sectional shape with the claw 9 is formed on the inner peripheral portion, An annular slide portion 21 extending in the axial direction is formed on the outer peripheral portion, and the slide portion 21 is continuously formed by providing a step portion 22 at the front end of the moving space 16 and having a larger inner diameter than the moving space 16. It is fitted inside the space 23 so that it can slide back and forth. That is, the slide portion 21 is movable between the step portion 22 and the flange portion 18 of the front holding member 6. Further, the rear side holding member 7 is attached such that the free end side of the claw 10 faces forward and is in contact with the claw 9 at the free end sides thereof.

The inner diameters of the claws 9 of the front side holding member 6 and the claws 10 of the rear side holding member 7 are made equal to each other by, for example, polishing finish in the state of being assembled in the casing 3. As described above, since the holding surfaces of both the claws 9 and 10 can be accurately finished after being assembled in the casing 3, it is possible to hold with high precision. The inner diameter of the workpiece 2 is set to be slightly larger than the outer diameter of the work 2 to be held, and the work 2 is inserted into and removed from the pawls 9 and 10 in a no-load standby state in which the piston 4 is retracted. I am trying to do it.

Further, as shown in FIG. 2, the piston 4 is moved forward to push the rear holding member 7 forward through the pawl presser 5, and the front holding member 6 and the rear holding member 7 are axially moved. The jaws 9 and 10 are elastically deformed by compressing in the direction, and the inner diameter of the jaws 9 is reduced so that the workpiece 2 is held, so that the work 2 is held by the two jaws 9 and 10. In this state, the front end of the slide portion 21 of the rear holding member 7 is in contact with the flange portion 18 of the front holding member 6. When both the claws 9 and 10 are elastically deformed, by setting symmetrically, for example, the edge contacting the work 2 is deformed forward in the front claw 9 and rearward in the rear claw 10, The work 2 is not displaced in the axial direction during this deformation. Therefore, by accurately positioning the work 2 before holding it by the claws 9 and 10, the work 2 can be accurately positioned even after holding. Further, when the piston 4 is retracted from this holding state and no load is applied, the front holding member 6 and the rear holding member 7 are elastically restored, and the rear holding member 7 retracts the pawl retainer 5. While moving, it moves backward and enters the standby state shown in FIG.

The air chuck 1 according to the present invention is fixed to a rotating shaft of a motor (not shown) and can rotate the work 2 by a predetermined angle while holding the work 2. For example, when the work 2 is a roll-shaped magnet, the surface of the work 2 can be magnetized with a high degree of accuracy in a state where the work 2 is positioned with the magnetizing yoke.

[0019]

[Effect of the device]

 According to the high-rigidity and high-precision air chuck of the present invention as described above, even if there is some variation in the finish tolerance of the outer diameter of the work to be held, the side surface of the work is partially cut. However, since the work is held at two points on each edge of both claws, the work can be held firmly, that is, with high rigidity and accurately. Also, the holding force of the work can be adjusted arbitrarily by adjusting the air pressure, and it is possible to follow changes in the outer diameter of the work.

[Brief description of drawings]

FIG. 1 is a central longitudinal sectional view of an air chuck of the present invention in a standby state.

FIG. 2 is a central vertical cross-sectional view of the same in a held state.

FIG. 3 is a side view seen from the work side in the state of FIG.

FIG. 4 is a side view of a conventional air chuck viewed from the work side.

FIG. 5 is a central vertical cross-sectional view of a standby state in which a pawl is fully opened.

FIG. 6 is a central vertical cross-sectional view of a state in which a work having an outer diameter that matches the inner diameter of a claw is held.

FIG. 7 is a central longitudinal cross-sectional view of a state in which a work having an outer diameter larger than the inner diameter of a claw is held.

[Explanation of symbols]

 1 Air Chuck 2 Work 3 Casing 4 Piston 5 Claw Presser 6 Front Holding Member 7 Rear Holding Member 8 Slit 9 Claw 10 Claw 11 Piston Body 12 Pressure Chamber 13 Pressure Chamber 14 Rod 15 Bulkhead 16 Moving Space 17 Presser 18 Flange 19 Cover member 20 Bolt 21 Sliding part 22 Step part 23 Sliding space

Claims (1)

[Scope of utility model registration request] 1. A casing is provided with a piston that advances and retreats by switching compressed air, an annular pawl retainer is provided in front of the piston and is capable of sliding forward and backward, and an inner peripheral portion is provided in front of the pawl retainer. A pair of annular holding members made of an elastic material serving as claws for holding the work are arranged in the front and rear, the front side holding member fixes a flange portion integrally formed on its outer peripheral portion to the casing, and the rear side holding member is the casing. In the inside, it is possible to slide forward by the pressing force of the pawl retainer and backward slide movable by elastic restoring force.In the holding state where the rear side holding member moves forward, both pawls elastically deform to reduce the inner diameter and hold the work. However, in the standby state where the rear side holding member moves backward, both the claws are elastically restored so that the inner diameter of the claws is widened and separated from the work piece. ..