JPS60195575A - Electrophotographic copying device - Google Patents

Abstract

PURPOSE:To extend the life of a blade and obtain stably copy pictures of high quality by using a photosensitive sheet consisting of an organic photoconductor. CONSTITUTION:A photosensitive band 5 is carried by a pair of carrying rolls 5a and 5b simultaneously with copy start, and an electrostatic charge charger 9 starts electrostatic charge, and the light of an exposure lamp 10a of an exposure device 10 is reflected on the surface of an original and is formed as an electrostatic latent image on the photosensitive band 5. A developing roll 14 is driven to control the gap between a developing sleeve 13a of a developing device 17 and the photosensitive body 5, and a visible image is formed by a toner. A copy paper 18 is supplied from a paper supply cassette 17 onto the toner image on the photosensitive body 5, and the toner image is transferred by a transfer charger 15. The photosensitive body 5 after transfer is advanced furthermore, and the remaining toner is removed by a cleaning device 27, and the remaining electric charge is removed by a destaticizing lamp 28, and the photosensitive body 5 is returned to the original arrangement position in a photosensitive body cassette 4 and is held between a pair of carrying rolls 5a and 5b, thus completing the copying operation.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electrophotographic reproduction apparatus using a photoreceptor sheet of an organic photoconductor.

Conventional Structure and Problems Generally, an electrophotographic copying apparatus using an organic photoconductor photoconductor has an endless belt-like photoconductor 61 (hereinafter referred to as
A photoconductor (referred to as a photoconductor) is run by a photoconductor driving drum 51a and a photoconductor driven roll 61b, the photoconductor 61 is charged by a charging charger 52, and the photoconductor 61 is charged from a document table 64 by an exposure device 63 having an exposure lamp 53a and an optical fiber lens 6sb. A light image is formed as an electrostatic latent image on the photoreceptor 61, and developed by the developer 56 to become a visible image. Next, copy paper 67 is fed from the copy paper cassette 66 by the paper feed roll 68, and the copy paper 67 is transported onto the toner image on the photoreceptor 61 by the transport roll pair 69 and the transfer guide 60, and is electrostatically attracted. Then, the toner image is transferred onto the copy paper 57 by the transfer charger 61. As the photoreceptor 51 and copy paper 57 further advance, the copy paper 67 is separated from the photoreceptor 61 by a separation claw 62, and the copy paper 67 is guided to a fixing guide 63, where a toner image is formed on the copy paper 67 by a fixing device 64. is established,
The paper is discharged onto a paper discharge tray 66. As the photoreceptor 61 further advances, the residual toner after the transfer is removed by a cleaning device 66 having a cleaning plate 66a, and the residual charge on the photoreceptor 61 is removed by a discharge lamp 87 to complete the copying process.

With the configuration of the electrophotographic copying apparatus as described above, it is necessary to fuse and connect the ends of the photoreceptor sheet to form an endless belt. In addition, if the circumference of the belt-shaped photoreceptor is not uniform, it will meander while traveling, causing charging, exposure, development, etc.
This method has the disadvantage that accuracy decreases in various processes such as transfer, and only low-quality copied images can be obtained. Furthermore, when an endless belt-shaped photoconductor is used, burrs are always generated at the fusion spliced portion, so the burrs and the cleaning blade rub against each other violently during cleaning, resulting in the cleaning blade being damaged and the photoconductor being poorly cleaned. There was a drawback. In addition, to obtain one copy of a group of people, an endless belt-like photoreceptor is run the desired number of times and charged each time.

The copying time is inefficient because the steps of exposure, development, transfer, cleaning, and static elimination are repeated. Furthermore, by repeating the above steps, the photoreceptor deteriorates significantly and must be replaced frequently, and the photoreceptor is difficult to handle during maintenance and inspection due to its belt-like shape.

OBJECTS OF THE INVENTION An object of the present invention is to provide an electrophotographic apparatus that can stably obtain high-quality images using photoreceptor sorting of organic photoconductors.

Structure of the Invention The electrophotographic copying apparatus of the present invention sequentially takes out each of the photoreceptor sheets from a photoreceptor cassette having a plurality of photoreceptor notes, and forms a light image from a document as an electrostatic latent image on each of the photoreceptor sheets. A developing roll is disposed to face the developing sleeve of the developing device, and when the photoreceptor sheet passes between the developing sleeve and the developing roll, the developing sleeve and the photoreceptor sheet are separated by the developing roll. By controlling the gap for development, there is no need to fusion splice the ends of the photoreceptor sheet to form an endless belt-like photoreceptor, which makes it possible to remove debris from the joints and eliminate the need for cleaning blades. To efficiently utilize a photoreceptor sheet by not causing damage, prolonging the life of the blade, and preventing meandering of the photoreceptor so that high-quality copies can be stably obtained. The copying time for making multiple copies can be shortened, and since the photoreceptor is stored in a cassette, the photoreceptor can be easily replaced during maintenance and inspection.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 shows a side view of essential parts of an electrophotographic copying apparatus according to an embodiment of the present invention.

In Fig. 2, 1 is the main body of the electrophotographic copying device, 2 is the document table, 3 is the document table cover, 4 is the photosensitive cassette, and 05, 6.7 are separated organic photoconductors. This is a photoreceptor sheet (hereinafter referred to as a photoreceptor) consisting of a photoreceptor. sa, esb are the conveyor roll pairs of the photoreceptor 6, ea, e
7a and 7b are a pair of transport rolls for the photoreceptor 7, and 8 is a control belt for improving charging and exposure accuracy. 9 is a charging charger, 1
o is an exposure device having an exposure lamp 10a and an optical fine lens 10b;
The photosensitive belt 6 is transported by a pair of transport rolls 5a and 6b by a copy start, and charging is started by a charging charger 9. 2 and the photoreceptor 6 move at the same speed, the light from the exposure lamp 10a of the exposure device 10 is reflected from the document surface and forms an electrostatic latent image on the photoreceptor S through the optical fiber lens 10b.

Next, while forming an electrostatic latent image on the photoreceptor 6, the photoreceptor 6 is supplied to the developing device 13 by a pair of delivery rolls 11, and is transported by a pair of developer transport rolls 12&, 12b. by the way,
When the leading end of the photoreceptor 6 is held between the pair of developer transport rolls 12b, the developing roll 1 faces the developer 13.
4 is driven to push the back surface of the photoreceptor 6, and controls the gap between the developing sleeve 13a of the developing device 17 and the photoreceptor 6 to realize a developing state, and a visible image is formed with toner. Ru.

Next, when the photoreceptor 6Vi on which the toner f image is formed reaches the transfer charger 16 and the transfer roll 16, the copy paper 18 is transferred from the paper feed cassette 17 to the paper feed roll 1 at the same timing.
9 and a pair of transport rolls 20a and 20bVc, the copy paper 18 is supplied onto the toner image on the photoconductor 6, and at the same time as the transfer charger 15 transfers the toner f image, a gap between the photoconductor 5 and the copy paper 18 is supplied. Separation belt 21 arranged
The copy paper 18 is separated from the photoconductor 5, guided to a fixing guide 24 by a conveyance guide 22 and a conveyance belt 23, fixed by a fixing device 26, and the copied image is discharged onto a paper discharge tray 26. . After the transfer, the photoreceptor 5 further advances, and the residual toner is removed by the cleaning device RK 27, the residual charge is removed by the static elimination lamp 28, and the photoreceptor 5 is transported by the pair of transport rolls 29 and 30 to the photoreceptor return device 31. 3
2, the photoreceptor 4 is returned to the original position of the photoreceptor 4 in the photoreceptor cassette 4, and is held between the pair of transport rolls 5a and 5b, thereby completing the copying operation.

The above explanation describes the copying operation when the number of copies is one, but in the case of copying multiple copies, the same copying process as explained above is repeated. 6 is conveyed to form an electrostatic latent image, and the developing device 13
As soon as the development is completed, the photoreceptor 6 starts to be transported for copying the second sheet. Further, at the same time as the development of the photoreceptor 6 is completed, the photoreceptor 7 starts to be conveyed for copying the third sheet.

The photoreceptor 6 and the photoreceptor 7 transported as described above undergo the same copying process as the photoreceptor 6. In addition, three photoreceptors 6, 6 . The process of sequentially removing the photoreceptor from the photoreceptor cassette 4, passing through each copying process, and returning to the photoreceptor cassette 4 until a predetermined number of copies are completed is repeated.

Effects of the Invention As is clear from the above description, the electrophotographic copying apparatus of the present invention sequentially takes out each of the photoreceptor sheets from a photoreceptor cassette having a plurality of photoreceptor sheets, and transfers the optical image from the document onto the photoreceptor sheet. A developing roll is disposed to face the developing sleeve of the developing device, and when the photoreceptor sheet passes between the developing sleeve and the developing roll, the developing image is formed as an electrostatic latent image. By controlling the gap between the developing sleeve and the photoreceptor sheet using the roll, there is no need to fusion-splice the ends of the photoreceptor to form an endless belt-like photoreceptor. It is possible to remove scratches on the cleaning blade, prevent damage to the cleaning blade, extend the life of the blade, and prevent meandering of the photoreceptor, making it possible to stably obtain high-quality copied images. By using the photoconductor sheet efficiently, the copying time for multiple copies can be shortened.Also, since the photoconductor is stored in a cassette, it is easy to replace the photoconductor during maintenance inspections. It is something that can be done.

[Brief explanation of the drawing]

FIG. 1 is a side view of essential parts of an example of a conventional electrophotographic copying apparatus, and FIG. 2 is a side view of essential parts of an electrophotographic copying apparatus according to an embodiment of the present invention. 1...Electrophotographic copying device body, 2...
Original platen, 3...Original platen cover, 4...
Photoreceptor cassette, 6°6, 7 knee-photoreceptor sheet, 6a, 5b, 6a, eb. 7a, 7b... Photoreceptor transport roll pair, 8...
...Control belt, 9...Charging charger, 1
o...Exposure device, 11...Pair of feed rolls, 12a, 12b...-Pair of developer transport rolls, 13...Developer, 14... ...Development roll, 16...Transfer charger, 16...
...Transfer roller, 17... Paper feed cassette, 18
... Copy paper, 19 ... Paper feed roll, 2
0a, 20b. 30... Conveyance roll pair, 21... Separation belt, 22... Conveyance guide, 23... Conveyance belt, 24... Fixing guide, 26・・・・・・
...Fuser, 26... Paper output tray, 27...
. . . Cleaning device, 28 . . . Static elimination lamp, 31, 32 . . . Photoreceptor return control device.

Claims (1)

[Claims] The photoreceptor sheets are sequentially taken out from a photoreceptor cassette having a plurality of photoreceptor sheets, and a light image from a document is formed as an electrostatic latent image on each of the photoreceptor sheets,
A developing roll is arranged to face the developing sleeve of the developing device, and when the photoreceptor sheet passes between the developing sleeve and the developing roll, the developing roll closes the gap between the developing sleeve and the photoreceptor sheet. An electrophotographic reproduction apparatus configured for controlled development.