JP2003145001A - Chuck for hollow base body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chuck capable of keeping the grasp of a hollow base body surely vertical and being used for a dip coating apparatus. SOLUTION: The chuck for a hollow base body is constituted so that a recessed part is provide on a tip part brought into contact with the upper end of the hollow base body and inserted into an upper end opening of the base body, an O-ring is mounted at the inside face forming an outside wall of the tip part in the recessed part and is pressed to be expanded in the outer diameter direction of the tip end part to be in pres-contact with the inner circumferential surface of the hollow base body, a piston having an outside surface forming the bottom surface of the recessed part housing the O-ring is provided inside and the O-ring is guided by the outside wall of the piston to be pressed and expanded while being rotated in the pressing direction in the pressing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow substrate chuck used for dip coating on a hollow cylindrical substrate.

[0002]

2. Description of the Related Art For dip coating on a cylindrical hollow substrate, as in the case of forming a photosensitive layer of a drum type photosensitive member used in an electrophotographic copying machine, for example, JP-A-62-65763 and JP-A-62-65763 are used. An immersion coating apparatus using a chuck described in Kaihei No. 3-11462 and the like is known, and various chucks are in practical use.

FIG. 1 shows a schematic structure of such a dip coating device. In the figure, 1 is a chuck, 2 is a hollow substrate, 3 is a coating liquid storage tank, the chuck 1 holding the hollow substrate 2 is suspended on an arm 4, and the arm 4 can rotate horizontally at a predetermined angle. Is mounted on the lifting device 5, and the lifting device 5 is guided by the vertical axis 7 and inserted so as to be movable up and down to form a chuck moving device 6.

As a result, the arm 4 of the chuck moving device 6 is horizontally rotated by a predetermined angle to move the chuck to the substrate transfer position, the elevating device 5 is moved downward to lower the chuck 1, and the hollow substrate 2 is moved. After the chuck 1 is inserted into the upper opening of the hollow substrate 2, the hollow substrate 2 is held and the chuck 1 is raised, the arm 4 is horizontally rotated by a predetermined angle to position the hollow substrate 2 on the coating liquid storage tank 3. Let Then, the hollow substrate 2 is lowered by the elevating device 5 to immerse the hollow substrate 2 from the lower end side in the coating liquid, and after predetermined dipping, the hollow substrate 2 is raised to take out the hollow substrate 2, and the arm 4 is horizontally rotated to the substrate transfer position. After the movement, the hollow substrate 2 is lowered to release the holding of the hollow substrate 2 by the chuck 1, and the dipping coating is continuously performed on the hollow substrate.

To hold the hollow substrate 2 by the chuck 1, as shown in FIG. 2 (a), after inserting the tip portion 11 into the upper end opening so as to contact the upper end of the hollow substrate 2, an air cylinder or the like is used. The O-ring 12 is spread outward in the radial direction of the tip portion 11 and pressed against the inner peripheral surface of the hollow substrate 2 as shown in FIG.
As in (b), the balloon 12 'at the front end in the insertion direction of the fitted tip portion 11 is inflated and pressed against the inner peripheral surface.

A conventional chuck using the O-ring shown in FIG. 2A will be specifically described with reference to FIG. 3. The chuck 1 includes a chuck outer shell body 10 fixed to an arm 4 of a chuck moving device 6. , The tip 11 of the chuck outer shell 1
The chuck main body 13 is attached to the chuck outer shell body 10 so as to be exposed below 0. Here, the chuck outer shell body 10 includes a flange 14 fixed to the arm 4.
And a cylindrical member 15 fixed to the flange 14. The chuck body 13 is formed by a guide 16 fitted into the cylindrical member 15, a cap 18 fixed to the upper end of the guide 16 by a bolt 17, and a center block 20 fixed to the guide 16 by a bolt 19. Piston 21 inserted in the cylinder
And an O-ring 12 mounted at the lower end of the piston 21 so that the vertical movement is restricted by the guide 16 and the center block 20 and the inner diameter can be enlarged by the piston 21, and the cap 18 is a cylinder. Member 1
5 is urged downward by an elastic body (coil spring) 23 so as to come into contact with and be locked by the inward projection 22 of FIG. The cap 18 and the flange 14 are separated by a predetermined distance, and the exposed tip portion 11 and the lower end of the cylindrical member 15 are also separated by a predetermined distance. Further, the piston 21 is moved upward by an elastic body (coil spring) 24. It is biased and inserted.

After the tip portion 11 is inserted into the upper opening so as to come into contact with the upper end of the hollow substrate 2, one of the supply / exhaust passages 25 is provided.
By supplying pressurized air from the inside to the cylinder and exhausting it from the other supply / exhaust passage 26, the O-ring 1
2 can be pushed in the outer diameter direction of the tip portion 11, the O-ring can be pressed against the inner peripheral surface 8 of the hollow substrate 2, and the hollow substrate can be held. On the contrary, by supplying pressurized air into the cylinder from the supply / exhaust passage 26 and exhausting it from the supply / exhaust passage 25, the hollow substrate 2
The pressure contact of the O-ring 12 with respect to the inner peripheral surface 8 can be released.

[0008]

However, according to the above-mentioned holding means, there is a problem that the holding state of the hollow substrate 2 is inclined, and the hollow substrate 2 is not properly immersed in the coating solution.

Therefore, an object of the present invention is to provide a chuck for use in a dip coating apparatus, which can surely hold the holding state of the hollow substrate vertically.

[0010]

The above object of the present invention is to provide a concave portion at the tip end which is abutted against the upper end of the hollow base body and is inserted into the upper end opening of the base body, and the O-ring has a tip end at the concave portion. Mounted on the surface forming the outer wall of the hollow portion, and pressing the O-ring to expand in the outer diameter direction of the tip end to bring it into pressure contact with the inner peripheral surface of the hollow base body, and to close the bottom surface of the recess for accommodating the O-ring. A hollow substrate chuck having a piston formed by an outer wall inside, and configured to be pushed and expanded while being rotated in the pressurizing direction by being guided by the piston outer wall when the O-ring is pressed, and abutted on the upper end of the hollow substrate. Has a concave portion at the tip end portion that is inserted into the upper end opening of the base body, and an O-ring is mounted in the concave portion within a plane forming the outer wall of the tip end portion, and the O-ring is pressed to obtain the outer diameter of the tip end portion. By pressing and expanding in the direction It has a piston therein, 10 ° to 60 O-ring pressing portion of the piston with respect to the vertical direction
A chuck for a hollow substrate having an inclination of 0 °, two or more recesses are provided at the tip end portions that are brought into contact with the upper end of the hollow substrate and inserted into the upper end openings of the base body, and an O-ring has a tip end portion at each of the recessed portions. A chuck for a hollow substrate, which is mounted in a plane forming the outer wall of the hollow substrate, and which has a piston therein, which presses the O-ring and expands the O-ring in the outer diameter direction of the tip to bring the piston into pressure contact with the inner circumferential surface of the hollow substrate, At the time of pressing, the center of the O-ring becomes 1 of the O-ring diameter.
Configured to move by 1/2 or more, inner diameter 30 mmφ
The following is used for dip coating of a hollow substrate.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited thereto.

FIG. 4 shows a first embodiment of the chuck of the present invention, FIG. 4 (a) is a front view showing the appearance of the tip portion 11 from the main body, and FIG. 4 (b) is for explaining the internal structure. It is a schematic sectional drawing.

In the figure, a chuck 1 is a cylindrical member 1.
The outer shell body 10 is composed of the outer shell body 5, and the tip portion 11 and the guide 16 are attached to the outer shell body 10 of the chuck so as to be exposed downward. Further, the tip portion 11 includes a tip portion forming member 27 locked to the cylindrical member 15 so as to be concentrically screwed, O-rings 12 and 31, a ring 30 for keeping a distance between the O-rings, and a guide 16. It is formed by a tip cap 29 locked by a bolt 28. Cylindrical member 15, tip forming member 27, ring 30
Also, a piston 21 having an outer wall forming a bottom surface of a recess for accommodating the O-rings 12, 31 is fitted into a cylinder formed by the tip forming member 27 and the guide 16. Reference numeral 24 is an elastic body (coil spring) that urges the piston 21 upward.

After inserting the tip 11 into the upper opening so as to contact the upper end of the hollow substrate 2, pressurized air is supplied from the air supply / exhaust passage 25 into the cylinder, whereby the O-ring 12, 31 can be pushed in the outer diameter direction of the tip portion 11, the O-ring can be pressed against the inner peripheral surface 8 of the hollow substrate 2, and the hollow substrate can be held. On the contrary, by exhausting air from the supply / exhaust passage 25, the pressure contact of the O-rings 12, 31 with the inner peripheral surface 8 of the hollow substrate 2 can be released.

In the present invention, the O-ring moves downward while deforming as shown in a model in FIG. 5 (a), so that the gripping force becomes strong. This deformation movement amount l (distance moved from the center when the pressure is released to the center when the pressure is released, see FIG. 5A) is O
It is preferably 1/2 or more of the diameter of the ring. Further, as shown in FIG. 5B, the O-ring pressing portion of the piston has an inclination of 10 ° to 60 ° with respect to the vertical direction (θ in the figure).
Since the O-ring expands while rotating, it has a function of pushing the hollow substrate upward, and has the effect of positioning accuracy and maintaining verticality.

FIG. 6 shows an improved version of the chuck shown in FIG. 3 in accordance with the idea of the present invention. Since the operation is the same, the description is omitted.

In this embodiment, two O-rings are used, but if there is a margin in the length in the vertical direction, 3-5.
You may use individually. Further, the effect of the present invention is exhibited if the degree of separation is at least larger than the diameter of the O-ring. Further, as described in JP-A-3-26362, a plurality of chucks having different diameters of a hollow substrate to be held are positioned coaxially with the smaller one holding a small-diameter hollow substrate being placed coaxially. The present invention can be effectively applied to the connected structure.

As described above, according to the present invention, since the O-ring is guided by the outer wall of the piston to be pushed and expanded while rotating in the pressurizing direction when two or more O-rings are mounted, the present invention can be gripped. It is accurate and can hold the hollow substrate vertically without tilting, and can prevent tilting of the hollow substrate due to external force, which is particularly advantageous when performing dip coating on a hollow substrate having a small diameter of 30 mmφ or less.

[0019]

EXAMPLES Examples of dip coating using the chuck of the present invention will be shown below, but the present invention is not limited thereto. The hollow substrate used was a 30 mmφ small diameter drum.

Example 1 When the following coating liquid (for the intermediate layer of an electrophotographic photosensitive member) was prepared and dip coating was performed using the chuck of FIG. 4, a good coating film having a dry film thickness of about 2 μm was obtained.

<Intermediate layer coating liquid> Polyamide resin 1 part by mass (Toray Co., CM8000) Titanium oxide 3.0 parts by mass (Taika Co., SMT500SAS silica treatment, alumina treatment and methylhydrogenpolysiloxane treatment as surface treatment) The composition containing 10 parts by mass of methanol was used in a sand mill as a disperser.
The dispersion obtained by dispersing in batch mode for 2 hours was diluted twice with the same mixed solution, and allowed to stand overnight and then filtered (filter; Rigimesh filter manufactured by Nippon Pall Ltd. nominal filtration accuracy; 5
μm, pressure; 490 kPa) to prepare an intermediate layer coating solution.

Example 2 The following coating liquid (for the charge generation layer of an electrophotographic photosensitive member) was prepared and dip coating was performed using the chuck of FIG. 4, and a good coating film having a dry film thickness of about 2 μm was obtained. .

<Coating Liquid for Charge Generation Layer> Y-type oxytitanyl phthalocyanine 20 g (maximum peak angle of X-ray diffraction by Cu-Kα characteristic X-ray is 27.3 at 2θ) Polyvinyl butyral 10 g (manufactured by Denki Kagaku Kogyo Co., Ltd., # 6000-C) tert-Butyl acetate 700 g 4-Methoxy-4-methyl-2-pentanone A composition consisting of 300 g was dispersed using a sand mill for 10 hours.

Example 3 The following coating solution (for the charge transport layer of an electrophotographic photoreceptor) was prepared and dip coating was performed using the chuck of FIG. 4, and a good coating film with a dry film thickness of about 25 μm was obtained. .

<Coating Liquid for Charge Transport Layer> Stilbene type charge transporting substance 75 g (manufactured by Ricoh Company) Polycarbonate resin 100 g (manufactured by Mitsubishi Gas Chemical Co., Inc., Iupilon-Z300) Methylene chloride 750 g Further, using the above-mentioned coating liquid, aluminum cylindrical shape An electrophotographic photosensitive member was manufactured by laminating an intermediate layer (2 μm), a charge generation layer (2 μm), and a charge transport layer (25 μm) on a substrate in this order. As a result, the chuck was firmly gripped and a large number of layers were retained without losing verticality. Could be applied stably.

Comparative Example 1 An electrophotographic photosensitive member was similarly manufactured using the chuck shown in FIG.
At 0 ° inclination, coating failure occurred on the photoreceptor, a grip error occurred at the 1508th line, the substrate dropped, and coating was interrupted.

[0027]

According to the present invention, since the O-ring is guided by the outer wall of the piston to be pushed and expanded while rotating in the pressurizing direction at the time of pressing, since two or more O-rings are mounted, the grip is accurate. Thus, the holding of the hollow substrate can be maintained vertically without tilting, and the tilting of the hollow substrate due to an external force can be prevented, which is particularly advantageous when performing dip coating on a hollow substrate having a small diameter of 30 mmφ or less.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of an immersion coating apparatus using a chuck.

FIG. 2 is a diagram illustrating holding of a hollow substrate by a conventional chuck.

FIG. 3 is a diagram specifically illustrating a conventional chuck that uses an O-ring.

FIG. 4 is a diagram showing an embodiment of a chuck of the present invention.

FIG. 5 is a model view showing the behavior of an O-ring.

FIG. 6 is a view showing another embodiment of the chuck of the present invention.

[Explanation of symbols]

1 chuck 2 Hollow substrate 3 Coating liquid storage tank 4 arms 5 Lifting device 6 Chuck moving device 10 Chuck outer shell 11 Tip 12, 31 O-ring 13 Chuck body 14 Flange 15 Cylindrical member 16 guides 17, 19, 28 bolts 18 caps 20 center block 21 pistons 23, 24 Elastic body 25, 26 air supply and exhaust passage 27 Tip forming member 29 Tip cap 30 ring

Claims (5)

[Claims] 1. A hollow body has a concave portion at its tip end that is abutted against the upper end of the hollow base body and inserted into the upper end opening of the base body, and an O-ring is mounted in the concave portion in a plane forming an outer wall of the tip end portion. , The O
When the ring is pressed, it has a piston that presses against the inner peripheral surface of the hollow base body by pressing and expanding in the outer diameter direction of the tip portion, and that the bottom surface of the recess for accommodating the O-ring is formed by the outer wall inside, and when pressing A hollow substrate chuck characterized in that an O-ring is guided by the outer wall of the piston and is expanded while rotating in a pressing direction. 2. A hollow base has a recess at its tip end that is abutted against the upper end of the hollow base and is inserted into the upper end opening of the base, and an O-ring is mounted in the recess within a plane forming the outer wall of the tip. , The O
The piston has an internal piston that presses the ring to expand it in the outer diameter direction of the tip end and presses it against the inner peripheral surface of the hollow substrate, and the O-ring pressing portion of the piston is 1
A hollow substrate chuck having an inclination of 0 ° to 60 °. 3. A hollow base has two or more recesses at its tip end that is brought into contact with the upper end of the hollow base and is inserted into the upper end opening of the base.
A ring is mounted in each of the recesses in a plane that constitutes the outer wall of the tip, and a piston that presses the O-ring and expands in the outer diameter direction of the tip to press-contact the inner peripheral surface of the hollow substrate is provided inside. A chuck for a hollow substrate, comprising: 4. The hollow substrate chuck according to claim 1, wherein the center part of the O-ring is moved by ½ or more of the diameter of the O-ring when pressed. 5. The hollow substrate chuck according to claim 1, which is used for dip coating of a hollow substrate having an inner diameter of 30 mmφ or less.