JPS60205473A - Production of developing sleeve - Google Patents

Abstract

PURPOSE:To prevent leakage of bias current owing to contact between a sleeve arbor and a photosensitive body by coating the part of the sleeve arbor by an insulating adhesive agent. CONSTITUTION:A magnet 1 is temporarily placed on the inside of a sleeve arbor 4 and flanges are press-fitted to both ends. Bearings 3 are simultaneously mounted thereto in this stage. An adhesive agent layer 5 is coated and formed to cover the outside peripheral surface of the arbor 4 and the side faces of the flanges 2 and after the adhesive agent solidifies on drying, the outside periphery is worked with the shaft parts 2a of the flanges 2 as a reference for working such as chucking and centering. An adhesive agent layer 5' is then coated and formed onto the layer 5. Microelectrodes 6 consisting of a material such as copper particles or the like are embedded into the surface of the layer 5' before the layer 5' dries to solidify. The outside surface is again subjected to finish working with the shaft parts of the flanges as a reference for working such as chucking and centering until the surface of the electrodes 6 are made flush with the surface of the layer 5' after the electrodes 6 are fixed upon drying and solidifying of the layer 5'.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a method for manufacturing a developing sleeve, and more particularly relates to a method for manufacturing a developing sleeve that can be applied to a developing means of an image forming apparatus using a belt-shaped photoreceptor. .

(Prior art) Conventionally, i[lI+
+ Image forming apparatuses that use a drum-shaped photoreceptor as an image carrier are known. It is also well known that a developing sleeve is used as a developing adhesive that supplies toner to the electrostatic latent image on the photoreceptor to make it visible.

By the way, between the above-mentioned conventional developing bags, there is a case where a large area electrostatic latent image (CF9rN solid image f) is visualized, and a small area electrostatic latent image (so-called line image) is visualized f#.
different requirements are imposed when

To explain this using the case of an electronic copying machine as an example, when the image of a document to be copied is one line image of a small area, the number of line images f of this document. Even when the density is relatively low, when I copy it, I get a high-density image (I+!1 of the original) that is higher than the density of the original image. When the image is a solid image of the right to human face, there is a claim that both close-up images have a density corresponding to the density of the solid image in this manuscript. In two-component toners, this requirement can be met to some extent by the action of gear and rear, but with one-component thread toners, there is a problem.

Therefore, as a technical means to meet such demands when using a special ζ one-component toner, an improved developing sleeve is disclosed in Japanese Patent Publication No. 114163/1983. According to the technique disclosed in -1-, an insulating layer is formed on the outside of a cylindrical conductive support, and a large number of minute poles are electrically insulated from each other on the periphery of this insulating layer. A developing sleeve having a retaining and disposed configuration is provided.

When developing using a developing sleeve with such a configuration, it is convenient to obtain the desired developing performance that meets the above requirements, but on the other hand, depending on the configuration of the developing sleeve, When a belt-shaped photoreceptor is used, a problem arises in that the conductive support and the photoreceptor come into contact and bias current leaks.

A conventional developing sleeve that causes the above-mentioned problem is shown by No. 6 10 in FIGS. 1 and 2.

In the figure, reference numeral 1 indicates a magnet, which is rotatably supported by a bearing 3 of a flange 2. The flange 2 is supported by a cylindrical sleeve core 4 as a conductive support.
An insulating adhesive #5 is formed on the outer periphery of this sleeve core metal 4. Then, on the outer periphery of the adhesive layer 5, an adhesive 5' made of the same material as the adhesive layer 5 is formed, and on the outside) a surface with a diameter of 10 to 500 μm is formed. The microelectrodes 6 made of a large number of copper particles are connected to each other by electrical N2
It is placed while maintaining the edge condition.

In such a developing sleeve 10, the portion not covered with the adhesive layer 5 at the end of the sleeve core metal 4 in the axial longitudinal direction has a dimension t.
It is formed over a period of time.

This is due to the steps in the manufacturing process as described later, but the exposed portion over this dimension t is the adhesive layer 5.
For example, if the photoreceptor is formed in a rigid drum-shaped support pot, even if the IU is connected to such a photoreceptor, the sleeve core metal 4 A phenomenon such as leakage of the bias current 61e through the calculating section does not occur.

However, if a belt-shaped photoconductor is used, then 1. What is this photoconductor? :As shown by number 7 in Figure 3, the current 1
When the sleeve 1O is configured to contact the circumferential surface of the sleeve 1O while being bent, the bias voltage applied to the opening between the photoreceptor and the sleeve core when the photoreceptor comes into contact with the exposed portion is reduced. There is a problem that current leaks and affects image formation.

By the way, in Fig. 3, the negative sign 8 indicates the toner cartridge,
9 shows a feeding plate that sends the magnetic toner supplied dropwise from the magnet 1 toward the developing sleeve 10, and the toner is fed by the feeding plate 8). This magnet 1 is rotated one by one to form a magnetic brush according to the rotation of the sleeve core metal 4, and the thickness is regulated by Dr. Sent.

It is adsorbed to the electrostatic latent image portion of the photoreceptor and subjected to development.

Here, the reason why an exposed portion that is not filled with an insulating layer is formed at the axial end portion of the sleeve core metal 4 over a dimension t is due to circumstances in the manufacturing process.

For example, in the conventional manufacturing process, first, the sleeve core 4 is covered with a rubber cap so that the portion extending over the IJ method t is covered, and the adhesive 5 is applied to the outer periphery. Next, after waiting for the adhesive layer 5 to dry, the rubber cap is removed, and the outer periphery of the adhesive layer 5 is finished by cutting using the inner diameter of the sleeve core metal 4 as a processing reference.

Next, cover the rubber cap again to form the N-contact layer 5', push copper particles as the microelectrode 6 into the peripheral surface, wait for drying and solidification, remove the rubber cap, and put the sleeve back on. The outer periphery is finished by cutting using the inner diameter portion of the core metal 4 as a processing reference. After that.

While holding the magnet 1 on the inner diameter portion of the sleeve core metal 4, the flange 2 is press-fitted to complete the machining.

In this 1181 method, since the inside of the sleeve core metal 4 is used as a processing reference, the intrusion of adhesive is prevented 11.
It is necessary to cover it with a rubber cap as described in Section 2 above, and for this reason, the 1j method IK wadding on the part of the rubber cap leaves a crest that is not covered by the adhesive.

In addition, when such an image sleeve is used in combination with a belt-shaped photoreceptor, bias voltage leakage can be reduced by 4.
I had something to do.

(Objective) Therefore, an object of the present invention is to provide an improved method for dyeing a developing sleeve, which can insulate required portions to prevent leakage of bias voltage.

(composition) The configuration of the present invention will be described below based on one embodiment.

The actual sleeve according to the present invention is shown in Fig. 4 and Figs. 1 and 5. The developing sleeve 12 shown in the figure has a structure in which an adhesive layer 5 covers the entire outer circumferential surface of the sleeve core 4 and also covers the side surface of the flange 2, thereby eliminating the problem of bias leakage caused by contact with the belt-shaped photoreceptor. This problem has been resolved.◇ This kind of current 1-sleeve is manufactured using the following steps.

First, a magnet is placed inside the sleeve core metal 4, and then the fludges 2 are press-fitted into both ends.

At this time, a simultaneous KIt%ll receiver 3 is also installed.

Thereafter, the adhesive layer 5 is applied to cover the outer peripheral surface of the sleeve core 4 and the side surface of the flange 2. Then, after waiting for drying and solidification, the outer periphery of the shaft portion 2a of the flange 2 is processed using processing standards such as chucking, kinging, and centering, and then an adhesive layer 5'
Form by applying. Before this adhesive layer 5' is dried and fixed, a microelectrode 6 made of a material such as copper particles is embedded in the surface of the adhesive layer 5'. Then, this adhesive layer 5
' is dried and solidified, and after the above minute [pole 6 is fixed, r
Qbi.

The outer periphery of the shaft portion of the flange 2 is rounded and rounded as a processing reference for chucking, kinging, and centering AF, and the surface of the microelectrode 6 and the surface of the adhesive layer 5' are finished on the same surface.

If such a manufacturing method j1 is followed, the shaft portion 2a of the fludge 2
Since this is the processing standard, there is no need to use a thumb cap as in the prior art, and 3) the outer periphery of the flood metal 4 can be completely covered with an insulating adhesive.

(Effects) In the developing sleeve according to the present invention, the portion of the sleeve core metal that is likely to come into contact with the belt-shaped photoreceptor is sufficiently covered with an insulating adhesive, so that the bias current is applied between the sleeve core metal and the photoreceptor. This is advantageous because the problem of leakage due to contact with the liquid does not occur.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a developing sleeve according to the prior art rc, Fig. 2 is a perspective view of a developing sleeve according to the conventional rc
The figure is a cross-sectional view of the same figure as above, FIG. 3 is a cross-sectional view of the developer mounting and photoreceptor device explaining the contact situation of the belt-shaped photoreceptor with the developing sleeve, and FIG. A sectional view of the sleeve, and FIG. 5 is a perspective view of one end side of the developing sleeve shown in the above figure. 2. Flange, 4. Sleeve core, 5+5' adhesive layer, 6. Microelectrode.

Claims (1)

[Scope of Claims] A toner supply means disposed in contact with a belt-shaped photoreceptor, which has an insulating layer around the outer periphery of a cylindrical conductive support. A developing sleeve I having a structure in which the electrodes are arranged while holding each other in a gas-struck shape.
Leave c. 4) Press the flanges onto both ends of a cylindrical sleeve core metal made of sex feed, and then press the outer circumference of the sleeve core to form an insulating adhesive layer. Next, a method for producing a developing sleeve is characterized in that a large number of microelectrodes are formed using this adhesive layer, and then the outer periphery is processed using the flange portion as a processing reference.