JPS61179468A - Copying machine - Google Patents

Abstract

PURPOSE:To facilitate replacing operation and to easily clean a charge wire by constituting a unit by mounting an electrostatic charger on a photosensitive body cover detachably, and then attaching and detaching this unit to and from a device body. CONSTITUTION:A photosensitive body 4 is extended between drum rollers 2 and 3 of the cover 27 and the electrostatic charger 12 is attached to the cover 27 detachably to constitute the unit 28. A socket 29 which has an elastic engaging leg part 31 formed is fixed to the case 121 of the electrostatic charger 12 at its end part and the leg part 31 is deformed elastically and engaged with the engagement recessed part 30 of the case 27 to assemble the unit 28, which is attached to the device body detachably. Consequently, the photosensitive body 4 and electrostatic charger 12 are easily replaced and the electrostatic charger 12 is easily detached from the case 27, so the charge wire is cleaned extremely easily.

Description

[Detailed description of the invention] Technical fields> This invention relates to a copying machine.

<Prior Art and Its Disadvantages> Generally, in a copying machine, the photoreceptor, which is the key to image formation, is considered a consumable item. This is because the photoconductive layer of the photoreceptor itself is fatigued and altered by light, heat, electric charge, and the like. Similarly, the charger also undergoes fatigue deterioration due to long-term discharging operation, and if the deterioration becomes excessive, it is necessary to quickly transform the charger together with the photoreceptor.

Conventionally, in order to facilitate the replacement work of the photoreceptor and the charger, it has been proposed that the photoreceptor and the charger are combined into a unit.

It is necessary to periodically clean the charger wire of the charger, which has toner, etc. attached to it, but if it is integrally fixed to the photoconductor side, cleaning the charger wire is easy even if the unit has a cleaning window. Hateful. In particular, it is extremely difficult to clean the side of the charger wire that faces the photoreceptor, and there is a risk that the charger wire may be accidentally cut.

<Object of the Invention> An object of the present invention is to eliminate the above-mentioned drawbacks, to provide a copying machine in which the photoreceptor and the charger can be easily replaced, and the charger wire is also easy to clean.

<Structure and Effects of the Invention> The present invention is characterized in that a charger is detachably attached to the photoreceptor side, and both of these are configured as one unit, and the unit is detachably attached to the main body of a copying machine. This is what I did.

According to the present invention, configured as described above,
The photosensitive drum side and the charger can be installed and removed from the copying machine as one unit, making it convenient for replacement work. In particular, since the charger can also be removed from the photoreceptor side, the charger wire can be thoroughly cleaned, and the fear of inadvertently breaking the charger wire during cleaning is eliminated.

<Embodiment> FIG. 1 is a schematic diagram of a copying machine which is an embodiment of the present invention.

In the figure, a loop-shaped photoreceptor 4 is disposed approximately in the center of the copying machine main body l, and is stretched around a pair of drum rollers 2 and 3. Above it, a lamp 5° reflector 6 and a focusing An exposure section 8 having a transparent light transmitting body 7 and the like is arranged. Further, a developing unit 9 is provided around the photoreceptor 4. Transfer charger 1
0. A static eliminating charger 11, a charging charger 12, etc. are arranged. Also, on the right side of the photoconductor 4 is a paper feed cassette 1.
3 and a paper feed roller 14, a pair of fixing rollers 15.16, a paper ejection roller 17.18, etc. are provided on the left side, and further below the drum roller 3, a paper feed roller 19.20 and a paper feed roller 14 are provided. A paper stop plate 21 and the like are installed. An original table 22 is placed on the top surface of the copying machine main body 1.

The surface of the photoreceptor 4 is uniformly charged by corona discharge from the charger 12. The image of the original is projected onto the surface of the photoreceptor 4 by the light of the lamp 5, and the charge corresponding to the white part of the original is neutralized. The electrostatic latent image on the surface of the photoreceptor 4 is then developed by a developing unit 9. In other words, the positively charged toner is attached to the negatively charged portion of the photoreceptor 4.

Next, by applying a negative charge from the transfer charger 10 through the paper, the toner attached to the photoreceptor 4 is transferred to the paper, and the toner is bonded by heat and pressure with the fixing rollers 15 and 16, thereby making a copy of the paper. become.

As shown in FIG. 2, the photoreceptor 4 and the charger 12 are connected to a charging window 23. Exposure window 24, development window 2
5 and a cover 27 having a static elimination window 26 as one unit 28.

The charger 12 has a charger case 121 and a charger wire 122.
As shown in FIG. 3, a charger socket 29 made of synthetic resin or the like is fixed to the end of the charger 1. As shown in FIG. This charger socket 29 is integrally formed with a pair of elastic engagement legs 31.31 that removably engage with an engagement recess 30.30 (FIG. 4) that is formed on the cover 27 side and also serves as a positioning means. has been done.

As shown in FIGS. 5A and 5B, each base end of the charging window 23 is closed by a shutter member consisting of a pair of elastic sheets 32 and 32 fixed to the cover 27 with an adhesive 33. The charger case 121 is configured to be opened when the charger 12 is attached.

In the above structure, if the pair of elastic engagement legs 31, 31 of the 12 chargers are elastically deformed inwardly to each other as shown in FIG. When the engaging legs 31, 31 are expanded and engaged with the engaging recesses 30, 30, the charger 12 is firmly fixed to the cover 27 at a precise position, and is integrated into a unit with the photoreceptor 4 side. Become. Therefore, the charge +12 and the photoreceptor 4 can be replaced every two days, which facilitates the replacement work.

When cleaning the charger wire 122, by elastically deforming the elastic engagement legs 31, 31 inward and pulling out the charger 12 in the opposite manner to the above, the charger wire 122 can be separated from the photoreceptor 4 when the charger case The entire charger wire 122 can be cleaned easily from the inside of the charger wire 121.

Even if the charger 12 is removed from the photoreceptor 4 side for a long time, the charging window 23 can be closed by the elastic sheet 32, 32 as shown in FIG.
There is no fear of fatigue due to outside light. When this elastic sheet 32 is used, the charger 12 is attached as shown in FIG.
Since the elastic sheet 32 extends toward the free end side of the elastic sheet 32 or toward the photoreceptor 4 side as shown in B), it also has the advantage that it can serve as a cover against toner that is about to scatter toward the charger wire 122 side.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a copying machine which is an embodiment of the present invention;
FIG. 2 is a cross-sectional view showing a unit of an electrostatic charger and a photoreceptor, and FIG. 3 is a perspective view of the main parts of the electrostatic charger. There are also Figures 4 (A) and (B). 1-copying machine body, 4-photoreceptor, 12-electrostatic charger, 23-charging window, 28-unit, 32-shutter member.

Claims (2)

[Claims] (1) A copying machine characterized in that a charger is removably attached to the photoreceptor side to form a single unit, and this unit is detachably attached to the main body of the copying machine. (2) The copying machine according to claim 1, wherein the unit is provided with a shutter member that opens and closes the charging window depending on whether the charger is attached or detached.