JPH057364U - Hollow cylindrical endless belt-shaped jig - Google Patents

Abstract

(57) [Abstract] [Purpose] A coating film can be formed as uniformly as possible on the outer peripheral surface of a hollow cylindrical body such as a seamless belt for a photoconductor of an electrophotographic apparatus. [Structure] The cylindrical component 10 and the ring-shaped component 11 constitute a cylindrical holding jig. The same-diameter portion 15 of the cylindrical part 10 is shorter than the length of the seamless belt 14, has a diameter slightly smaller than the inner diameter of the seamless belt 14, and the step 13 has a diameter smaller than that of the same-diameter portion 15. Collar 1 at the end of the same diameter portion 15
2 and step 13 are provided. Collar 12 and ring-shaped component 1
1 has tapered surfaces 12 a and 18 each having a maximum diameter larger than the inner diameter of the seamless belt 14. The seamless belt 14 is held from the inside by the two tapered surfaces 12a and 18, and a uniform gap is formed between the seamless belt 14 and the same diameter portion 15 to prevent the occurrence of abnormal film pressure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention relates to a holding jig for a hollow cylindrical endless belt, and particularly to an endless jig. In a coating device for forming a photosensitive layer on a belt-shaped substrate by spray coating The present invention relates to a holding jig suitable for holding.

[0002]

[Prior art]

  A device for spray-coating the photosensitive layer of an electrophotographic photoreceptor on an endless belt-shaped substrate. As an arrangement, there is one as shown in FIG. In the figure, 1 is a cylindrical jig, which is a rotation transmission shaft. 2 and the connecting flange 3 are connected and held horizontally. Again this Driving parallel to the rotation transmission shaft 2 at a position away from the holding position of the cylindrical holding jig 1. A shaft 4 is provided, and a spray gun 6 is attached to the drive shaft 4 via a base 5. It is installed so that it can move parallel to the rotation transmission shaft 2. Endless belt-like The base material 7 is fitted onto the outer periphery of the holding jig 1, and the holding jig 1 is rotated and sprayed. Spray the photosensitive layer forming material from the gun 6 and move the base 5 along the drive shaft 4 once or more. Painting is performed by moving it up.

[0003]

[Problems to be solved by the device]

  In general, spray coating operation has two processes for convenience, namely, atomization of paint. It is divided into process and film forming process. Formed on the outer peripheral surface of the substrate 1 by the device shown in FIG. The factor that determines the uniformity of the film thickness of the applied coating is Uniform particle size, particle size distribution, particle spatial density, particle flight distance, etc. The air flow distribution around the article to be coated, the ambient temperature, and the like. Coating thickness that requires these factors It is said that the film thickness can be made uniform by optimizing and managing according to.

[0004]   By the way, nickel formed by electroforming as an endless belt-shaped substrate When a photosensitive material is applied with the device shown in Fig. 5 using a seamless belt made by It was confirmed that a peculiar nonuniformity occurs in the film thickness distribution in the direction (radial direction). So The pattern is a width of about 2 cm at one or two places in the circumferential direction of the seamless belt. Therefore, it was 20% thicker than other parts. For example, 25μ after film formation In some cases, non-uniformity of 5 μm was generated with respect to the m-average film thickness. Investigate this cause However, there is a slight gap between the seamless belt and the cylindrical holding jig and the film thickness is different. It was understood that Tsune was corresponding. Insert the seamless belt into the holding jig for this gap. This gap is inevitably generated due to the difference between the inside and outside diameters provided as a margin for entry. Since the gaps are offset, the seamless belt and the holding jig are in contact with each other. Part that does not come into contact with the contacted part occurs, and the film thickness of the coating film that touches this contacted part becomes abnormal. It was supposed to be thick. The gap is the largest crescent shaped It was about 300 μm.

[0005]   In order to confirm this phenomenon, thicknesses of polyester film made of 300 μm and 50 μm, Insert strip-shaped spacers with a width of 1 cm between the seamless belt and the holding jig. The gap was forcibly formed by using the device shown in Fig. 5, and spray coating was performed. However, the film thickness profile of the sample reproduces the abnormal film thickness as shown in FIG. It became. In FIG. 6, X1 is a place where a spacer of 300 μm is inserted, and X2 is 50 μm. It can be seen that large film thickness abnormalities occurred at the two places where the spacers were inserted. It

[0006]   The mechanism of such abnormal membrane pressure in the belt circumferential direction is considered as follows. available. That is, the paint that has adhered to the surface of the seamless belt at the position with a gap, Compared to paint that has adhered to other positions that have no gap, due to the heat insulation effect that the gap exhibits The cooling effect that accompanies the evaporation of the solvent in the paint is large and the drying progresses slowly. Drying is advancing and the solid content of the surrounding paint is melted out and sucked up, resulting in This is the same as the amount of paint adhered to the positions with gaps compared to the positions without gaps. It is considered that the membrane pressure becomes thicker. Eliminate such defects , The seamless belt is completely adhered to the outer surface of the cylindrical holding jig over the entire circumference. It is conceivable to attach the seamless belt to the holding jig in practice. It is thought that it will not be possible to remove it, making it almost impossible to realize Become.

[0007]   The present invention has been made in view of such a conventional problem, and has a hollow cylindrical endless shape. Separate the belt-like body from the outer peripheral surface of the cylindrical holding jig as evenly and completely as possible. As a result, the film pressure will be non-uniform when the coating film is formed by spray coating. An object is to provide a holding jig that can be operated without generating.

[0008]

[Means for Solving the Problems]

  A holding jig for a hollow cylindrical endless belt according to the present invention comprises a cylindrical part, And a ring-shaped part fitted to the outer periphery of the cylindrical part, wherein the cylindrical part is the same. The outer diameter of the diameter part is slightly smaller than the inner diameter of the above endless belt-shaped body, and Taper with a maximum diameter larger than the inside diameter of the above endless belt The endless bell is provided with a collar portion having a surface and the length of the same diameter portion is A step portion that is shorter than the length of the tongue and has a diameter smaller than the above-mentioned same diameter portion on the other end side. , The ring-shaped component has an inner diameter of the endless belt-shaped body on the fitting side of the stepped portion. It is slightly smaller and expands outward from the fitting side, and the maximum diameter is the above endless bell. It has a tapered surface that is larger than that of the rod-shaped body. The endless belt-like body is held from the inside.

[0009]   A holding jig for a hollow cylindrical endless belt-shaped body according to the present invention is the above-mentioned cylindrical part. Is hollow, and the inner peripheral surfaces of both ends are provided with tapered surfaces that incline into the hollow portion. be able to.

[0010]

【Example】

  Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 3 show one example of the present invention It is sectional drawing of the holding jig which concerns on an Example. As shown in FIG. 1, a hollow circle according to the present invention The tubular holding jig consists of two parts, namely a cylindrical part 10 and a ring-shaped part 11. To be done.

[0011]   The cylindrical part 10 has a collar portion 12 formed at one end and a phosphorus portion at the other end. A step 13 is formed to fit the groove-shaped component 11. The brim 12 is a hakama shape And the maximum outer diameter of the tapered surface 12a is for the photosensitive layer spray coating to be fitted. 0.5 to 1.5 mm larger than the inner diameter of the seamless belt 14 (preferably 1 m m larger). The outer diameter of the same diameter portion 15 between the tapered surface 12a and the step 13 is 0.1 to 1 mm smaller than the inner diameter of the seamless belt 14 (preferably 0.5 m m smaller). The cylindrical part 10 has a hollow shape and has inner edges at both ends. The taper parts 16 and 17 are machined to easily connect with the drive mechanism of the coating device. It has a structure that allows it.

[0012]   The ring-shaped part 11 has an inner diameter slightly larger than the outer diameter of the step 13 of the cylindrical part 10. On the outer surface, a tapered surface 18 having the same angle as the tapered surface 12a of the cylindrical component 10 is formed. Is formed, and both ends serving as holding parts are symmetrical when fitted into the cylindrical part 10. It is designed to This taper surface 18 also has a maximum outer diameter of the photosensitive layer surface to be fitted. 0.5 to 1.5 mm larger than the inner diameter of the seamless belt 14 for play coating (preferred 1 mm larger).

[0013]   The material of both the cylindrical part 10 and the ring-shaped part 11 is metal or plastic. Etc. can be adopted.

[0014]   Next, the operation of fitting the seamless belt 14 in this embodiment will be described. Well Without inserting the seamless belt 14 from the step 13 side of the cylindrical component 10, Unless a large amount of force is applied to the part where the diameter of the hakama-shaped tapered surface 12a is the same. Proceed to a position where it cannot be fitted any further. Then, the ring-shaped part 11 is cylindrical Fit into the step 13 of the component 10. At this time, the seamless belt 14 is the step 13 Since the length of the cylindrical part 10 is determined so as to protrude from the portion, the ring-shaped part 1 1 is smoothly inserted by its tapered surface 18, but the seamless belt 1 When the inner diameter of the rear end of 4 and the tapered surface 18 have the same diameter, apply an excessive force. Unless fitted, it cannot fit any further. Stop fitting the ring upper part 11 at that position As a result, the seamless belt 14 has the tapered surfaces 12a and 18 only at both ends thereof. The inner surface does not come into contact with the same diameter portion 15 of the cylindrical component 10 at all, It will have a thin air layer of substantially uniform thickness. That is, the coating pressure between the holding jig and There is no bias in the gap that causes the abnormalities.

[0015]   Next, an example of spray application to a seamless belt using the holding jig according to the present invention is explained. Reveal 30μm thick inner diameter 127.27mm, length 360mm by electroforming A seamless belt was measured with an outer diameter of 126.8 mm, an outer peripheral surface length of 350 mm, and a hakama-shaped te -Measurement maximum outer diameter 128.10 mm of tapered surface of tapered surface and ring-shaped parts And apply 90 parts of THF with a coating device equivalent to the spray coating device shown in FIG. Spray paint with 10 parts of dissolved polycarbonate (Teijin Panlite) did. The spray application conditions are Sauter mean particle size 8 to 10 μm, paint spray flow Volume 10 cc / min, particle flight distance 120 mm, coating object rotation speed 60 rpm, spray -Gun moving speed 5 mm / sec, temperature of coated object 20 ° C, wind speed around coated object 1 m / se c and the temperature was 22 ° C. After spray coating, dry in an oven at 150 ° C for 60 minutes It was used as a sample. When measuring the film thickness, the total amount of the coating film and the It was determined by an electronic micrometer by subtracting the thickness of the substrate. That conclusion As a result, as shown in FIG. 4, a uniform and excellent film thickness distribution without film thickness abnormality was obtained.

[0016]   In addition, the explanation of the example of the abnormality is made by spray coating the photosensitive layer of the electrophotographic photosensitive member. However, the present invention is not limited to this. Can be used as a jig for holding various hollow cylindrical endless belts .

[0017]

[Effect of device]

  The holding jig for the hollow cylindrical endless belt-like body according to claim 1 has been described above. The endless belt-like body is held only at the ends by the taper parts provided at both ends. As a result, a uniform thickness can be obtained over the entire surface between the endless belt and the holding jig. An air layer is formed on the entire surface, and the temperature change of the coating film during spray coating It is possible to make uniform, and it becomes possible to make the film thickness of the coating film uniform There is an effect. In addition, the holding jig of the present invention consists of a cylindrical part and a ring-shaped part. The endless belt-like body can be easily It has the effect of becoming

[0018]   The holding jig for the hollow cylindrical endless belt-shaped body according to claim 2 is a hollow circle. Since taper parts are provided on both ends of the tubular part, in addition to the above common effects, This has the effect of facilitating connection and attachment to the drive mechanism.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a holding jig for a hollow cylindrical endless belt-shaped body according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an enlarged part A in FIG.

FIG. 3 is a cross-sectional view showing an enlarged part B in FIG.

FIG. 4 is a graph showing a film thickness formation result when spray painting is applied to a seamless belt using a holding jig of an actual manufacturing example of a cylindrical part of a holding jig for a hollow cylindrical endless belt-shaped body according to the present invention. Is.

FIG. 5 is a perspective view showing an apparatus for spray-coating an endless belt-shaped substrate using a conventional holding jig.

FIG. 6 is a graph showing an example of a film thickness formation result when spray coating is applied to an endless belt-shaped substrate using a conventional holding jig.

[Explanation of symbols]

10 Cylindrical parts 11 Ring-shaped parts 12 brim 12a Tapered surface 13 steps 14 Seamless belt 15 Same diameter part 16, 17 Tapered part 18 Tapered surface of ring-shaped parts

Claims (2)

[Scope of utility model registration request] 1. A hollow-cylindrical holding jig for holding a hollow-cylindrical endless belt-shaped body from the inside, comprising a cylindrical part and a ring-shaped part fitted around the outer circumference of the cylindrical part. The cylindrical part has a taper in which the outer diameter of the same diameter portion is slightly smaller than the inner diameter of the endless belt-shaped body and expands outward in a hakama shape at one end side, and the maximum diameter is larger than the inner diameter of the endless belt-shaped body. The ring-shaped portion is provided with a collar-shaped portion having a surface, the length of the same-diameter portion is shorter than the length of the endless belt-shaped body, and a step portion having a smaller diameter than the same-diameter portion is provided on the other end side. The part has a taper surface in which the fitting side to the step is slightly smaller than the inner diameter of the endless belt-shaped body and expands outward from the fitting side so that the maximum diameter is larger than the endless belt-shaped body. And above both taper A holding jig for a hollow cylindrical endless belt-shaped body that holds the above-mentioned endless belt-shaped body from inside by means of a curved surface. 2. The jig for holding a hollow cylindrical endless belt according to claim 1, wherein said cylindrical part is hollow, and inner peripheral surfaces of both ends thereof are provided with tapered surfaces which are inclined into the hollow portion.