JP2000000708A - Gripping device, finishing machine and manufacture of sleeve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily change gripping torque of a long size material having the contour of a circular cross section even in the middle of work by forming the sliding surface of a housing and the gripping rotary part with a fluid supply passage, arranging a circumferential directional annular groove at least on one side in the sliding surface, and facing the fluid supply passage to the annular groove. SOLUTION: A housing 110 is composed of an outside housing 111 and an inside housing 112. The gripping rotary part 120 contains an inside holding body 121 and movable holding bodies 124, 125. When pressurized air is introduced from a clamp side air introducing port 130 arranged in the outside housing 111, the air reaches the sliding surface 134 through an air supply passage 131, an annular groove 132 of the inside housing 121 and an air supply passage 133. In the sliding surface 134, the air reaches a pushing-out space 137 through an air supply passage 136 regardless of a phase of rotation by an annular groove 135 of the outer peripheral surface of the inside holding body 121, and the air pushes out the movable holding bodies 124, 125 having a taper in the end part, so that a sleeve is gripped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing machine for rotating a long material having a circular cross section or a part of a circular shape around an axis to perform inner or outer peripheral processing. The present invention relates to a processing machine for performing inner or outer peripheral processing on a metal sleeve used for a developing roll, a cleaning roll, a paper feed roll, or the like used in a copying machine, a printer, or the like.

[0002]

2. Description of the Related Art In an image forming method utilizing electrophotography or electrostatic recording, an electrostatic image formed on the surface of an image carrier made of a photoconductor or a dielectric is developed by a developing roller held on a developing roll. A final image is obtained by developing with a developer, transferring the obtained developer image onto a plain paper or other transfer member and then fixing it.

[0003] As shown in FIG.
It has a sleeve 81 which is a developer supporting member formed of a non-magnetic metal material, and a permanent magnet member 82 having a plurality of magnetic poles on its surface, which is disposed inside the sleeve 81. The sleeve 81 has a flange 83 and a bearing. The structure is rotatable with respect to the permanent magnet member 82 via the shaft 84 and the shaft 85. However, when the developer to be used consists only of non-magnetic powder, the permanent magnet member 82 is not necessary.

[0004] The sleeve is opposed to the surface of the image carrier at a predetermined distance (development gap) so as to form a development area between the sleeve and the surface of the image carrier. As the sleeve rotates, the developer held on the sleeve is transported to the developing area, and the toner contained in the developer adheres to the electrostatic charge image to obtain a developer image.

One of the important factors for obtaining a good developer image is to keep the developing gap constant. The developing gap is about 0.2 to 1 mm. However, if the sleeve itself is warped or the assembling accuracy of the developing roll is insufficient, the sleeve surface swings and fluctuates when the sleeve rotates. Higher run-out accuracy is required for the developing roll in order to obtain a good developer image with an increase in the speed of a copying machine or a printer and a higher definition of printing. In order to increase the assembling accuracy of the developing roll and ensure a high run-out accuracy, it is necessary to subject the sleeve to an inner peripheral fitting portion with the highest possible accuracy, that is, a so-called in-row (reference numeral 86 in FIG. 108).

FIG. 6 shows a conventional mechanism of a mechanism for gripping and rotating the sleeve when performing spigot processing on the sleeve, that is, a conventional gripping device. However, since it is a line symmetrical drawing, the lower half is omitted. The illustration of the sleeve, the rotating power mechanism, the working tool (bite) and the like is also omitted. FIG.
The mechanism for gripping the sleeve will now be described. When pressurized air is introduced from the air inlets 610 and 620 on the clamp side, the air reaches the spaces 611 and 621 and the slide member 6
12, 622 are pushed and slid in the directions of arrows X and Y, respectively. The slide members 612 and 622 have flange portions 612a and 622a.
When 2 slides in the direction of arrow X, a gap is formed between the rotation side claw portion 613a. The rotation-side claw portions 613a are provided at three positions at 120-degree pitches in concave portions of the ring-shaped member 613d having concave portions. Further, a thread is cut in the inner diameter of the ring-shaped member 613d, and a collet 613c is screwed thereto.
The spring 615 accommodated in the holding body 614 is
Press 13b. Since the pin 613b is in contact with the ring-shaped member 613d, it moves the collet 613c in the X direction. The springs 615 are provided at equal intervals in 16 locations in the circumferential direction, and press the collet 613c evenly. The collet tip 613ca is equally divided by a plane passing through the central axis, and the outer peripheral surface is tapered. Since the holding body 614 is also formed with a tapered surface that matches with the holding member 614, when the collet 613c moves in the X direction, the tip of the collet is depressed, and the inner peripheral surface of the collet tip presses the outer peripheral surface of the sleeve to grip the sleeve. is there. The holding force (gripping torque) is a spring 61
5 depends on the strength of pressing the collet 613c in the X direction. The same applies to the gripping mechanism of the collet 623c. In this state, the rotational power is obtained from the V pulley 630, and the portions supported by the bearings 616, 626, ie, the holding members 614, 624,
The collets 613c and 623c, the sleeve, and the like are rotated. The sleeve is gripped and processed so that the tip of the sleeve projects slightly outside the tip of the collet. If the amount of protrusion is too large, the tip of the sleeve will swing due to the processing resistance, and the processing accuracy will decrease.

To release the gripping of the sleeve, pressurized air is supplied from the air inlet 631 on the unclamping side to the space 63.
Introduce to 2. After that, the operation is the reverse of the gripping operation. The air pushes the slide members 612 and 622 in the directions of arrows Y and X, respectively, and slides them. The collar 612a is a spring 615
And presses the rotating claw 613a to push the collet 61
3c is moved in the Y direction, the collet tip 613ca opens, and the grip of the sleeve is released. Collet 6
The same applies to the operation of releasing the grip of 23c.

[0008]

An aluminum alloy tube or a stainless alloy tube is used for a sleeve of a developing roll of a copying machine or a printer. The strength and the processing resistance are different between the aluminum alloy pipe and the stainless alloy pipe. What is important for gripping a workpiece is to grip the workpiece with as little distortion as possible. This is because if processing is performed in a state in which distortion is applied and gripping is released, processing accuracy deteriorates when distortion is eliminated. In order to hold the workpiece with as little distortion as possible, it is preferable to hold the workpiece with a minimum force within a range where the grip can be maintained without losing the resistance during processing (processing resistance).

In the conventional gripping device shown in FIG. 6, for example, when cutting a stainless steel alloy tube, the cutting resistance of the stainless steel alloy is large, so that it is necessary to increase the torque for gripping it. When the aluminum alloy tube is machined after the stainless alloy tube is machined, the aluminum alloy tube having a small strength is machined in a strained state, so that the machining accuracy is reduced after the gripping is released. Aluminum alloy tube (The gripping torque may be small because the cutting resistance is small.)
When the stainless steel alloy tube is machined after the above, the gripping torque is too weak and gripping becomes insufficient. Also, in the beginning of machining, when performing the finishing by increasing the feed amount of the tool by roughing and reducing the feed amount at the end, the cutting resistance is reduced in the finishing process, so we want to reduce the gripping torque, but in the conventional gripping device, The gripping torque cannot be changed during machining.

In order to solve such a problem, it is necessary to change the torque for gripping the workpiece according to the strength and cutting resistance of the workpiece. You have to change the spring. Although a plurality of springs are provided at an equal angular pitch, replacement of these requires disassembly and reassembly of the gripping device, and this work is not performed every time the material of the workpiece changes. Not be. This increases the downtime of the processing machine and does not increase the operation rate. It is conceivable to use a different type of processing machine for each material of the workpiece, but it is difficult to flexibly respond to the need for a larger number of processing machines and fluctuations in production volume. And other problems arise.

[0011] There are still other problems with conventional gripping devices.
That is, the holding members 614, 6 fixed when gripping
The collets 613c and 623c grip the workpiece 24 while moving in the X and Y directions, respectively. Therefore, when gripping both ends of the workpiece, a force in the direction of compressing in the axial direction is applied to the workpiece. The distortion due to this also contributes to a reduction in processing accuracy.

Accordingly, an object of the present invention is to provide a gripping device and a gripping device that can easily change the gripping torque even during processing when gripping a long material (workpiece) having a circular or a part of a circular cross section. To provide a processing machine. Another object is to provide a gripping device and a processing machine for gripping both ends of a workpiece without applying a force in a direction of compressing the workpiece in an axial direction. Still another object is to provide a processing machine capable of accurately performing inlay processing of an end portion while having a structure for gripping one end of a workpiece.

[0013]

SUMMARY OF THE INVENTION In order to easily change the torque for gripping a workpiece according to the strength and cutting resistance of the workpiece, a gripping rotation that grips the workpiece and rotates together with the workpiece. There is a need for a mechanism that can constantly apply gripping torque to the part from the outside. The present inventor gives a gripping torque by the pressure of the fluid, and if the gripping rotating portion and the outer boundary surface, that is, the sliding surface, can supply fluid even during rotation and have a structure that does not leak fluid, the fluid pressure can be adjusted by adjusting the fluid pressure. We thought that the gripping torque could be changed at any time. However, since there is no problem with slight leakage of the fluid, the gripping rotating portion does not need to be in contact with the outside, and may be opposed with a slight gap. Therefore, in the present invention, not only a boundary surface formed by contact between the gripping rotating unit and the outside but also a case where both are separated from each other by a slight gap is regarded as a boundary surface and regarded as a sliding surface. The mechanism for gripping the workpiece may be a mechanism in which the fluid pressure is reflected on the gripping torque.

The present invention is a gripping device having a housing and a gripping rotating portion rotatably held by the housing for gripping a workpiece and rotating with the workpiece, wherein the housing and the gripping rotating portion include a fluid supply path. And a sliding surface is formed, and a circumferential annular groove is provided on at least one side of the sliding surface, and the fluid supply path faces the annular groove so that fluid can be supplied from the housing to the gripping rotating unit. It is like that. The gripping rotation unit has a gripping member that grips the workpiece. A collet or Palm Chuck (registered trademark) can be suitably used for the gripping member. When a collet is used, the collet is moved in the axial direction by the fluid pressure supplied to the gripping rotation unit, and the diameter of the collet is reduced by the taper at the tip, and the workpiece is gripped. A member that is in contact with the outer peripheral side of the collet may be moved without moving the collet in the axial direction.
In the gripping operation in this case, only the distal end of the collet is reduced in diameter, so that even when gripping at both ends of the workpiece, little force is applied in the axial direction of the workpiece. Air or oil can be suitably used as the fluid. With the gripping device having such a configuration, not only disassembly and reassembly work is unnecessary, but also the fluid pressure to be supplied can be changed, and the gripping torque can be freely changed even when the workpiece is gripping and rotating. You can. Then, the relationship between the material (working resistance) of the workpiece and the fluid pressure at which high accuracy can be obtained may be obtained experimentally in advance.

[0015] The gripping rotation unit is rotatably held by the housing via a bearing. When the gripping rotating part rotates, friction heat is generated in the bearing. This heat is transmitted to the gripping rotation unit and the housing. In particular, the gripping rotation unit is structurally difficult to dissipate heat, and thus easily thermally expands in the axial and radial directions. By leaving one of the bearings free in the axial direction, thermal expansion in the axial direction can be released. If the gap between the sliding surfaces is small, the amount of leakage of the fluid is reduced and the fluid pressure is easily controlled. However, the thermal expansion in the radial direction increases the frictional resistance on the sliding surface, so that frictional heat is generated on the sliding surface and eventually seizure occurs. If the gap between the sliding surfaces is made large, there is little fear of seizure, but the amount of fluid leakage increases, making it difficult to control the fluid pressure. Considering these, it is preferable that the gap between the housing and the gripping rotating part on the sliding surface is 2 to 10 μm.

[0016] If at least one of the housing and the gripping rotating portion forming the sliding surface is formed of a low thermal expansion material, the gap is hard to change, so that even if the gap is set small, seizure hardly occurs. In this case, it is not necessary to form the entire housing or the rotating part of gripping with a low thermal expansion material, and an effect can be obtained only by forming the vicinity including the sliding surface with the above material. Low thermal expansion materials include high nickel-iron alloys, the main ones being amber, elinvar, platinum and the like. Amber contains 35-37% nickel and has a coefficient of thermal expansion of about 0.0000012 at 20 ° C., which is about 1 /
It is 10. Moreover, it has a low value up to about 200 ° C.

It is also effective to prevent seizure by forming at least one of the housing forming the sliding surface and the gripping rotating part with a self-lubricating material. Even when friction occurs on the sliding surface, if at least one of them is a self-lubricating material, the increase in frictional resistance and the generation of frictional heat can be reduced. In this case, it is not necessary to form the entire housing or the gripping rotating portion with a self-lubricating material, and the effect can be obtained only by forming the portion including the sliding surface in the vicinity thereof with the aforementioned material. A carbon material can be suitably used as the self-lubricating material. Carbon materials have not only self-lubricating properties but also excellent thermal conductivity and heat resistance and a small coefficient of thermal expansion. Examples of the carbon material include graphite, carbon graphite, resin impregnated material, metal impregnated material, resin binder, metal binder, and impervious carbon graphite.

It is more preferable that one of the housing side and the gripping rotating part side forming the sliding surface is formed of a low thermal expansion material and the other is formed of a self-lubricating material. In particular, if the housing side is formed of a self-lubricating material and the gripping rotating section side is formed of a low thermal expansion material, even if a small gap is set, seizure hardly occurs and a very stable sliding surface can be obtained. In this case, it is not necessary to form all of the housing or the gripping rotating part with the above-mentioned material, and an effect can be obtained only by forming the portion including the sliding surface in the vicinity thereof with the above-mentioned material.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a surface including a rotation axis of a gripping device according to an embodiment of the present invention. The mechanism for holding the sleeve will be described with reference to FIG. The housing 110 includes a cylindrical outer housing 111 and an inner housing 112. The gripping rotation unit 120 includes an internal holder 121, external holders 122 and 123, movable holders 124 and 125, gripping members 126 and 127, and a V pulley. Internal holder 1
21 and the external holding members 122 and 123 are integrally engaged by screws, and the gripping members 126 and 127 (collet) are also engaged with the internal holding members 121 by screws cut at their ends.
First, a sleeve (not shown) as a workpiece is set. Next, when pressurized air is introduced from the clamp side air introduction port 130 provided in the outer housing 111, the air flows through the air supply path 131, the annular groove 132 of the inner housing, the air supply path 133 of the inner housing, and the sliding surface 134.
Reach On the sliding surface 134, the air reaches the pushing space 137 via the air supply path 136 regardless of the rotation phase due to the annular groove 135 on the outer peripheral surface of the inner holding body 121. The movable holder 1 having an air tapered at the end.
The collet tip 12 is extruded by extruding 24, 125.
6a and 127a are reduced in diameter to clamp (grasp) the sleeve
I do. While the air is being supplied, the air is held by the movable holder 1
Since the keys 24 and 125 are kept pressed, the clamped state is maintained. When the air pressure is adjusted, the grip torque is also adjusted, so that the grip torque can be changed by the air pressure even during rotation. Further, since the collet does not move in the axial direction when clamping, no axial distortion is given to the sleeve.

When the grip is released, the movable holder 124,
You just have to pull back 125. When pressurized air is introduced from the unclamping-side air introduction port 138 provided in the outer housing 111, the air returns to the space 139 via the air supply path. Then, the movable holders 124 and 125 are pulled back by the air pressure, the collet tip is opened, and the grip of the sleeve is released.

When the gripping rotation unit 120 is rotated, the bearing 1
Heat is generated from 40 and 141. Heat is applied to the outer housing 111
And the external holding members 122 and 123. The temperature of the outer housing 111 is small because the outer housing 111 is in contact with the outside air and the volume is large. However, the temperature of the external holding members 122 and 123 is large. Since there is almost no gap, friction increases and seizure easily occurs. In the present embodiment, the inner holder 121 and the outer holders 122 and 123 are made of an amber material, thereby suppressing expansion and making the friction on the sliding surface hard to occur.

Further, in the present embodiment, the inner housing 112
Was formed of a resin impregnated carbon material (KC-830K). The inner housing is press-fitted into the outer housing 111 to prevent air leakage with an O-ring. Rotating internal holder 1
21 is opposed by a gap of about 5 μm. With such a gap, there is little air leakage, so that highly accurate control of the air pressure can be easily performed. Even if friction occurs on the sliding surface, the frictional resistance is small, so that little frictional heat is generated and seizure does not occur. An enlarged detail of the inner housing 112 is shown in FIG. In the inner housing, through-holes serving as a clamp air supply path 133, an unclamping air supply path 142, and a cleaning air supply path 143 are formed at 90 ° intervals, and the outer peripheral surface is provided with an annular groove 1.
There are 32. The presence of the annular groove 132 has the advantage that there is no need to match the phases of the air supply passages of the external housing and the air supply passages of the internal housing when press-fitting the external housing. The annular groove 144 is a groove for fitting an O-ring.

The cleaning will be described with reference to FIG. If the workpiece is gripped while dust such as swarf is adhered to the holding portion of the collet or the workpiece, machining accuracy is reduced. Therefore, it is preferable to perform cleaning when gripping the workpiece. The cleaning air is blown into the collet from the cleaning air inlet 145 via the air supply path, and blows off dust between the collet and the outer periphery of the workpiece.

[0024]

(Embodiment 1) The outer diameter of the gripping device shown in FIG.
X 1mm x 320mm length aluminum alloy sleeve
Was gripped to perform spigot processing. Inverter controlled
Gripping rotation via a V-belt by a motor (not shown)
The part was rotated. The processing conditions are as follows. Collet: φ25 Air pressure: 3kgf / cm^Two  Revolution: 2500r.p.m Tool: Carbide cutting tool Feed: 0.07mm / rev. Cutting amount: Cutting length 7mm, Cutting allowance 0.2mm Cutting oil: Oil-based coolant

A developing roll shown in FIG. 8 was assembled using the obtained sleeve, and the run-out accuracy of the roll surface was measured to be 10 μm. Although 100 sleeves were continuously processed, almost the same runout accuracy was obtained, and no seizure occurred on the sliding surface. FIG. 5A shows a shake accuracy measuring device. The runout accuracy is determined by setting the shafts 51 at both ends of the developing roll
It is measured while receiving and rotating it in a block (not shown). A laser beam 54 is emitted from the light emitting section 52 and received by the light receiving section 53. FIG. 5B is an enlarged view taken along the line AA of FIG. 5A. The laser light 54 emitted from the light emitting section 52 is
A part of the light is blocked and the rest reaches the light receiving unit 53. At this time, if the sleeve 50 shakes, the amount of laser light reaching the light receiving unit 53 varies. This variation is converted into a displacement (mm). Such a measurement was performed simultaneously at the three points shown in (a), and the maximum value was determined as the runout accuracy.

Comparative Example 1 An aluminum alloy sleeve similar to that of Example 1 was gripped by the gripping device shown in FIG. The gripping rotating unit was rotated via a V-belt by a motor (not shown) controlled by an inverter. The processing conditions are as follows. Collet: φ25 Number of revolutions: 2500 rpm Tool: Carbide tool Feed: 0.07 mm / rev. Cutting amount: Cutting length 7 mm, cutting allowance 0.2 mm Cutting oil: Oil-based coolant Developing using the obtained sleeve as shown in Fig. 8 When the roll was assembled and the run-out accuracy of the roll surface was measured, it was 16 μm.

FIG. 3 is a cross-sectional view of a gripping device according to another embodiment of the present invention in a plane including a rotation axis. This embodiment uses a palm chuck 32 instead of a collet as a gripping member.
6, 327 are used. The palm chuck is a chuck having a mechanism for opening and closing the claws 326a and 327a by air pressure, and has open air ports 326b and 327b.
And closed air ports 326c and 327c. The palm chuck used in this embodiment is manufactured by Dynamic Tool Corporation. At the time of clamping, the closed air ports 326c and 327c pass through the air supply path 321b, and at the time of unclamping, the open air ports 326b and 327 pass through the air supply path 321d.
Pressurized air is supplied to b, and the claws 326a and 327a clamp and unclamp the sleeve 328. FIG. 7 shows a schematic structure of the palm chuck. The structure is close to the air cylinder. When the pressurized air enters the chamber A, the claws open, and when the pressurized air enters the chamber B, the claws close. The gripping torque can be changed by changing the air pressure in the chamber B.

The mechanism for holding the sleeve will be described with reference to FIG. The housing 110 includes an outer housing 111 and an inner housing 112. The holding and rotating unit 120 includes a holding body 321, flanges 322, 323, 324, and 325 (V
Palm chucks 326 and 327 integrally engaged with the holder 321 by screws. First, a sleeve 328 as a workpiece is set.
Next, when pressurized air is introduced from the clamp side air introduction port 329 provided in the outer housing 111, the air is supplied to the air supply passage 111a, the annular groove 112a of the inner housing,
Sliding surface 3 via air supply passage 112b of the inner housing
Reach 30. On the sliding surface 330, the air reaches the closed air ports 326c and 327c of the palm chuck via the air supply path 321b regardless of the rotation phase due to the annular groove 321a on the outer peripheral surface of the holder 321. While air is being supplied, the clamped state is maintained. When the air pressure is adjusted, the grip torque is also adjusted, so that the grip torque can be changed by the air pressure even during rotation. Further, when clamping, the claws of the palm chuck do not move in the axial direction, so that no axial distortion is given to the sleeve.

When pressurized air is introduced from the air inlet 331 on the unclamping side, the air is supplied to the air supply path 111.
b, reaching the sliding surface 330 via the annular groove 112c of the inner housing and the air supply passage 112d of the inner housing.
In the sliding surface 330, the annular groove 321 on the outer peripheral surface of the holder 321 is provided.
The air is supplied to the air supply path 3 regardless of the phase of rotation.
Open air ports 326b, 3 of palm chuck through 21d
Reaches 27b. Then, the claws are opened and the clamp of the sleeve is released.

In this embodiment, the holding member 321 is made of an amber material, thereby suppressing expansion and making the friction on the sliding surface 330 less likely to occur.

Further, in the present embodiment, the inner housing 112
Was formed with carbon-bonded carbonaceous KC830K. The inner housing is press-fitted into the outer housing 111 to prevent air leakage with an O-ring. The rotating holding body 321 is opposed to the rotating holding body 321 with a gap of about 5 μm. The basic structure of the inner housing 112 is the same as that of FIG.

The cleaning air is introduced from the cleaning air inlet 340 and is jetted toward the outer peripheral surface of the sleeve to blow off dust between the holder 321, the palm chuck and the outer peripheral surface of the sleeve.

(Embodiment 2) The outer diameter of the gripping device shown in FIG.
mx 1mm thick x 320mm long stainless steel alloy
The leave was gripped and spigot processing was performed. Inverter system
Is controlled via a V-belt by a controlled motor (not shown).
The rotating part was rotated. The processing conditions are as follows. Air pressure: 3.3kgf / cm^Two  Revolution: 2500r.p.m Tool: Carbide Tool Feed: 0.07mm / rev. Cutting Amount: Cutting Length 7mm, Cutting Allowance 0.2mm Cutting Oil: Oil Coolant Using the obtained sleeve, assemble the developing roll shown in Fig. 8.
When the run-out accuracy of the roll surface was measured, it was 4 μm.
Was. Continuous processing of 100 sleeves, but almost the same
Runout accuracy is obtained and no seizure occurs on the sliding surface
won.

Comparative Example 2 A stainless steel sleeve similar to that of Example 2 was gripped by the gripping device shown in FIG. The gripping rotating unit was rotated via a V-belt by a motor (not shown) controlled by an inverter. The processing conditions are as follows. Number of revolutions: 2500 rpm Tool: Carbide cutting tool Feed: 0.07 mm / rev. Cutting amount: Cutting length 7 mm, cutting allowance 0.2 mm Cutting oil: Oil-based coolant Using the obtained sleeve, assemble the developing roll shown in Fig. 8 The runout accuracy of the roll surface was measured and found to be 15 μm.

In the above embodiments, the gripping device for gripping both ends of the workpiece has been described, but only one end may be gripped. In this case, the other end is supported by, for example, a support mechanism 40 shown in FIG. The other end of the sleeve 41 is rotatably supported by three free rollers 42, one of which is pressed by a spring 43. In order to process both ends by gripping only one end, it is necessary to once process and then grip the sleeve again, so that the processing efficiency is lower than in gripping both ends. However, there are advantages that there is no limitation on the length of the sleeve and that it is easy to pour cutting oil into the sleeve from the end on the non-grip side to the grip end. When processing is performed on the inner surface of the sleeve, the supply of cutting oil from the gripping side passes through the tool, so that not only the problem of not being able to be sufficiently supplied to the processing portion, but also the effect of driving out chips.

FIG. 8 is an enlarged view of a main part of FIG. 4, and FIG. 9 is a schematic view of the processing machine viewed from the side. As described above, in this embodiment, the outer peripheral surface of the free end of the sleeve 41 is rotatably supported by three free rollers (bearings) 42a to 42c. Lower two receiving rollers 42a, 42b
Is accurately maintained with respect to the center of the main shaft of the sleeve 41, and is positioned and supported at an angle of 30 ° in this example. Thereby, centering of the sleeve can be performed accurately. The upper pressing roller 42c is located on the center line, and the pressing force can be adjusted by adjusting the spring 43. In particular, the cutting portion of the cutting tool 45 is positioned below the upper and lower regions formed by the extension of the center line a of the receiving roller 42a and the center line b of the receiving roller 42b. That is. Furthermore, the cutting blade is opposed to the rotational direction of the sleeve. As a result, the roundness of the outer diameter of the sleeve is directly reflected in the inner diameter processing, so that the sleeve can be cut to a constant thickness t. Conventionally, the machine accuracy such as the rotational accuracy and rigidity of the main shaft of the machine has been reflected in the machine accuracy, but in this example, only the rotational accuracy of the receiving roller is the factor of the machine accuracy. As described above, the effect that the sleeve end portion can be subjected to the spigot processing with high accuracy is exhibited.

[0037]

According to the gripping device of the present invention, it is possible to grip a long material (work material) having a circular cross section or a part of a circular shape, according to the material of the work material and the processing resistance. In addition, the required minimum gripping torque can be set only by changing the supplied fluid pressure. Therefore, since the distortion of the workpiece during processing is small, high processing accuracy can be obtained. Even if it is the spigot processing which grips one end of the work material, it can be performed with high accuracy.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a gripping device according to one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of an inner housing used in the gripping device of the present invention.

FIG. 3 is a longitudinal sectional view of a gripping device according to another embodiment of the present invention.

FIG. 4 is a support mechanism for supporting an end of the workpiece that is not gripped.

FIG. 5 is a diagram showing a method for measuring the runout accuracy of a developing roll.

FIG. 6 shows an example of a conventional gripping device.

FIG. 7 is a schematic diagram of a mechanism of a palm chuck.

FIG. 8 is a schematic view showing an embodiment in which one end of a workpiece is gripped and the other end is subjected to spigot processing.

FIG. 9 is a schematic diagram of the lateral side of FIG. 8;

FIG. 10 shows an example of a developing roll using a sleeve.

[Explanation of symbols]

110 housing, 111 outer housing, 112
Inner housing 120 Gripping rotating part, 121 Inner holder, 122, 1
23 External holder 124, 125 Movable holder, 126, 127 Gripping member 126a, 127a Collet tip, 130 Clamp side air inlet 131, 133, 136, 142, 143 Air supply path 135, 144 Annular groove, 134 Sliding Face, 137
Extrusion space, 138 Unclamp side air inlet, 139 Pullback space 145 Cleaning air inlet, 321 Holder 321a Annular groove, 326, 327 Palm chuck,
328 Sleeve 329 Clamp side air inlet, 330 Sliding surface 331 Unclamp side air inlet, 620 Clamp side air inlet 612, 622 Slide member, 613c, 623c
Collet 614, 624 Holder, 615 Spring 631 Unclamp side air inlet, 80 Developing roll, 81 Sleeve 86 Inlay

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masato Mitsuyama 1222 Hagiwara-cho, Takasaki City, Gunma Prefecture Inside the Heisei Engineering Co., Ltd. (72) Inventor Mineo Tajima 2977 Tahira, Yoshii-cho, Tano-gun, Gunma Prefecture Inside

Claims (6)

[Claims] 1. A gripping device having a housing and a gripping rotation unit rotatably held with respect to the housing, gripping a workpiece and rotating with the workpiece, wherein the housing and the gripping rotation unit define a fluid supply path. A gripping device having a sliding surface, a circumferential annular groove provided on at least one side of the sliding surface, and a fluid supply path provided so as to be connected to the annular groove. 2. The grip according to claim 1, wherein at least one of a portion including at least the sliding surface between the housing and the grip rotating unit is formed of a low thermal expansion material or a self-lubricating material. apparatus. 3. The housing according to claim 1, wherein at least a portion of the housing including the sliding surface is formed of a self-lubricating material, and at least a portion of the gripping rotating portion including the sliding surface is formed of a low thermal expansion material. The gripping device according to claim 2. 4. A gripping device according to claim 1, further comprising: a power mechanism for rotating a gripping rotation unit of the gripping device; and a tool for processing a gripped workpiece. Processing machine. 5. A method for manufacturing a sleeve, comprising a step of processing a sleeve end, wherein the step includes:
A gripping and rotating part which is held rotatably with respect to the housing and grips the workpiece and rotates with the workpiece; the housing and the gripping and rotating part have a fluid supply path and form a sliding surface; On the surface, a circumferential annular groove is provided on at least one side, and the fluid supply path grips and rotates the sleeve with a gripping device provided so as to be connected to the annular groove,
A method for manufacturing a sleeve, comprising processing a sleeve end. 6. A workpiece is gripped rotatably at one end, and the inner peripheral surface at the other end is machined by a working tool, and the lower side of the outer peripheral surface at the other end of the workpiece. Is received by two receiving rollers, the upper side is pressed by one pressing roller and supported at three points, and a center line connecting the center of the workpiece and each center of the two receiving rollers is drawn. A processing machine for processing an inner peripheral surface of a workpiece by positioning a blade of a processing tool below the processing tool.