JPS5990878A - Cylindrical body for electrophotographic photosensitive body - Google Patents

Abstract

PURPOSE:To increase strength in the circumferential direction, to prevent deformation and to make a cylindrical body thin and light by forming an opening on one end of the cylindrical body, forming a bottom face as one body on the other end, and also forming a projecting part radially on the bottom face. CONSTITUTION:The circumferential surface of a cylindrical body 15 is coated with an electrophotograhic photosensitive body 15a', an opening 15c is provided on one end, a bottom face 15b is formed as one body on the other end, and plural ribs 18 are provided projectingly in a radial state as a projecting part. This cylindrical body 15 is manufactured by an impact working device, therefore, strength in the circumferential direction is increased, there is no possibility that it is deformed in an ironing process, and also even if it is rotated against press-contacting force of a cleaning blade, a magnetic brush, a transfer paper, etc. in case when it is used as a photosensitive drum, no deformation is caused. Accordingly, the photosensitive drum can be made thin, and its weight can be made light.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylindrical body for an electrophotographic photoreceptor, for example, provided in an electronic copying machine.

[VltAI background of the invention and its problems] In general, this yuzu cylindrical body is made by extruding a pipe into a piece of tubing, and after processing the opening, it is drawn out twice to obtain a predetermined diameter. Shape to size. Next, after going through the cutting process, straightening process, cutting process, and cleaning process, it is manufactured using a special machine through the outer periphery roughing process, end face processing process, outer periphery finishing process cleaning process, and outer periphery coating process. It is designed to be used as a body drum.

However, the conventional cylindrical body for photoreceptor is open at both ends. The strength in the circumferential direction is not sufficient.
There is a risk of deformation during the post-processing process, and it is also a cleaning grade when used as a photoreceptor drum.

Magnetic brush. Because it rotates against the pressing force of transfer paper, etc., it sometimes deforms due to pressure.

Therefore, it was not possible to make the photoreceptor drum four-thick, and it was not possible to reduce its weight.

[Purpose of the invention]

The present invention has been made in view of the above circumstances.

The object is to provide a cylindrical body for an electrophotographic photoreceptor that has increased strength in the circumferential direction and can eliminate the above-mentioned disadvantages.

[Summary of the invention]

The present invention aims to achieve the above object. It is a cylindrical body with a photographic photoreceptor installed on its circumferential surface, and has an opening at one end and an integrally formed bottom surface at the other end, with projections formed radially on the bottom surface. .

[Embodiments of the invention]

The present invention will be described below with reference to an embodiment shown in the drawings. In the figure, 15 is a cylindrical body, and the cylindrical body J5 (FIG. 1II) is coated with an electrophotographic photoreceptor 15a'. One end of the cylindrical body J5 is provided with an opening 15c, and the other end is provided with a JC bottom facing 15c as shown in an enlarged view in FIG.
5b is integrally formed. In addition, the bottom surface 15b
A plurality of rigs J8 as protrusions are provided to protrude radially. This cylindrical body 15 has a V shape so that it can be manufactured by an impact machining device as shown in FIG. That is, in the figure, 1 is a die 1 forming a cavity 12 having an arcuate portion 2a on the periphery of the inner bottom, and 3 is a die 1 provided above the die 1 for holding the material (slag) A accommodated in the cavity 2. i! It is a punch that does not pressurize.

The die 1 is composed of a cylindrical die ring 5 having a reinforcing ring 4 fitted around its outer periphery, and a core 6 fitted into the die ring 5.

The die 11 configured in this manner is held by the die holder 7 and collet 8.

The punch 3 is guided by a punch guide 9 so as to be movable up and down, and its upper end is attached to a press ram of a punch actuation mechanism (not shown), and the punch 3 is attached to a press ram (not shown) of a punch actuation mechanism, and the punch 3 is applied with a force of about several hundred tons to the punch 3 housed in the cavity 2 of the dyno. Sum A f: Impact pressure is applied.

The punch 3 is still provided with an air inlet 1 in the center of its tip surface, which can be opened and closed by the pulp JO.
It communicates with the outside via an air passage 12 consisting of a hole 12a and a second hole 12b bored to intersect with the first hole 12a. The pulp 10 has a conical pulp main body 10a that opens and closes the air inlet 1, and a conical pulp body 10a that opens and closes the air inlet 1.
By inserting a bottle J4 inserted from a direction perpendicular to the axis of the punch 3 into an elongated hole J3 formed in the support part 10b, which is separated from the support part 10b interposed in the hole 12a.

It is supported to be vertically movable, that is, to open and close the air inlet 11. In addition, the tip surface of the punch 3 is slightly inclined so that the center part is higher.This angle of inclination varies depending on the material A, processing degree, and product design, but in the case of copper, it is about 5 degrees.

In the case of aluminum alloys, the angle is generally about 1° to 2°.

The outer periphery of the tip of the punch 3 is formed to have a slightly larger diameter than the other parts, and the diameter of the bearing land 3a is the diameter of the cylindrical body 1.
It is set to be approximately equal to the inner diameter dimension of No. 5. Further, the gap size between the bearing land 3a and the inner peripheral surface of the cavity 2 of the punch 11 is set to be approximately equal to the wall thickness of the cylindrical portion 15a of the cylindrical body J5, and at the bottom dead center position of the punch 3. The gap between the tip end surface of the punch 3 and the inner surface of the cavity 2 of the cylindrical body 17 is set to be approximately equal to the thickness of the bottom portion 15b of the cylindrical body 15.

Further, as shown in detail in FIG. 4, eight V-shaped 1 yen 416... are carved radially from the center on the tip surface of the punch 3. These 816... are carved so that they gradually become deeper and wider as they go toward the outer circumference.

Note that 17 shown in FIG. 3 is a stripper attached to the punch guide 9.

As shown in Fig. 5 (Fig. The punch actuation mechanism that is not attached to the press ram is activated, and the punch 3 that is not attached to the press ram suddenly descends, impacting and pressing the material A in the cavity 2 with a force of, for example, about 600 tons. As shown in Figure 5 (/9), the material is plastically deformed and flows upward along the punch 3 from the gap formed between the inner peripheral surface of the dyno cap 12 and the outer periphery of the punch 3, and -radius 1 A cylindrical body 15 having an opening 15C at one end and integrally having a Km surface 15b at the other end is molded.

Further, when the impact pressure by the punch 3 is finished, the punch 3 starts to rise as shown in Fig. 5). At this time, the cylindrical body J
5 is pressed down in advance by the stripper 17, and when the inside of the cylindrical body 15 becomes a negative pressure, the shibarug 10 is lowered, the air inlet 11 is opened, and the punch 3 is removed from the cylindrical body J5. When the punch 3 is completely removed from the cylindrical body 15 as shown in FIG. ntjf
The cylinder 9 is raised, and the cylindrical portion 15a is used as a photoreceptor drum element (for example, outer diameter 78I7J11, length 33).
0 ton 34 omM, wall thickness of cylindrical part 15m 0.8 ytt
The manufacture of the phragmatic cylindrical body J5 of rr+ is completed.

The cylindrical body 15 manufactured in this way is ironed and used as a photosensitive drum of an electronic copying machine.

As described above, Ic, the cylindrical body 15Fi, and the bottom surface 15b are integrally formed on the cylindrical portion 15a.

Since the rigs J8 are provided radially protruding from the bottom surface 75b, the strength in the circumferential direction is significantly increased compared to the conventional one in which both ends are open, and there is a risk of deformation during the post-process ironing process, etc. There is no risk of deformation even if the photosensitive drum is rotated against the pressure of a cleaning grade, magnetic brush, transfer paper, etc. when used as a photosensitive drum. Therefore, the photoreceptor drum can be made thinner and its weight can be reduced.

〔Effect of the invention〕

As explained above, the present invention is a cylindrical body in which an electrophotographic photoreceptor is provided on a curved surface, which has an opening at one end, a bottom surface integrally formed at the other end, and arrows radially arranged on the bottom surface. By forming a part, the strength in the circumferential direction can be significantly increased, and deformation during post-processing steps and when used as a photoreceptor drum can be reliably prevented. It has the effect of being able to be measured and its weight can be reduced.

[Brief explanation of drawings]

FIG. 1 is 'tb, a front view showing a cylindrical body for a secondary photographic photoreceptor;
FIG. 2 is a side sectional view showing a part of the enlarged view. FIG. 3 is a vertical front view showing the /I impact processing device. 4121 is a bottom view showing the punch, and FIG. 5 is an explanatory view showing the manufacturing process of the cylindrical body. 15... Cylindrical body, 15c... Opening, 16b... Bottom surface. 18...Protrusion h7t+a'...Electrophotographic photoreceptor. Applicant's agent Patent attorney Hiko Rin Ushiki Figure 1 Figure 2 Figure 3 Figure 5

Claims (1)

[Claims] A cylindrical body with an electrophotographic photoreceptor provided on its circumferential surface, characterized in that it has an opening at one end and an integrally formed bottom surface at the other end, and protrusions are formed radially on the surface of the paper. 11- Ribbed body for electrophotographic photoreceptor.