JPS60159858A - Running device of photosensitive body - Google Patents

Abstract

PURPOSE:To hold copy pictures in a high level and make a copying device small-sized without damaging the life withstanding copying, by adding an auxiliary roll to the biaxial roll system and making a belt-shaped photosensitive body elliptic and flat to run it and arranging an exposure process and transfer and development processes in the center part and both end parts of the photosensitive body respectively. CONSTITUTION:Power is supplied from another driving source to a main roll 16, and the main roll 16 runs a photosensitive body 19, and a following-up roll 17 is provided in parallel with the main roll 16 and separately from it. An auxiliary roll 20 is placed in the about center part between the main roll 16 and the following-up roll 17 and is brought into contact with the rear face of the photosensitive body 18 and is arranged in parallel with the main roll 16. These three rolls consist of aluminum pipes or the like and are supported by respective supporting shafts. Such force is given to supporting shafts of the main roll 16 and the following-up roll 17 that they are separated from each other, and a proper tension is applied to the photosensitive body 18. Thus, the photosensitive body is made flat and is run elliptically to reduce considerably the height of an outside case.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention utilized an electrophotographic process. The present invention relates to a photoreceptor traveling device of a copying machine.

2. Description of the Related Art Structures and Problems In recent years, copying apparatuses using electrophotographic processes have been widely used, and products aimed at personal use have recently begun to appear. Needless to say, an important element for a product aimed at personal use is that it is small and easy to handle.

As a photoreceptor in this type of copying apparatus, an organic photoreceptor using an organic optical semiconductor material is being used instead of a photoreceptor made of selenium or cadmium sulfide.

Compared to selenium or cadmium sulfide photoreceptors, organic photoreceptors do not contain harmful or polluting elements, and therefore are advantageous in terms of ease of handling. Next, a method of mounting and running the organic photoreceptor will be explained. Usually, an organic photoreceptor is made by applying a vapor-deposited aluminum layer of about 100 OA to the surface of a polyester film (for example, Mylar) with a thickness of about 100 μm, and then applying an organic photosensitive material to a thickness of 10 to 16 μm to form a sheet. This is then wrapped around an aluminum drum to form a photoreceptor drum. Figure 1 explains this running method,
FIG. 2 is a configuration diagram of a photoreceptor drum and electrophotographic process elements arranged around the photoreceptor drum. , 1 is an aluminum drum that rotates by receiving power from another drive source (not shown) and has a notch in a part of its cylindrical surface. Reference numeral 2 denotes a sheet-like photoreceptor whose winding end is embedded in the notch of the aluminum drum 1 and fixed by a presser plate 3.
An appropriate tension is applied by the force of the spring 4 which pulls the aluminum drum towards the center of the aluminum drum. Reference numeral 6 denotes a main charger, which applies a uniform charge to the surface of the photoreceptor 2. To explain the electrophotographic process in which the photoreceptor drum is rotated clockwise, the photoreceptor 20 is charged with electricity as the starting point for copying, and then the exposure process begins. 6
1 is an exposure lens, 7 is an exposure lamp, and 8 is an original moving table.

A glass fiber lens array is often used as the exposure lens in small copying machines. Therefore, the original to be copied is placed on a moving original platen, and the photoreceptor drum is exposed to the lens from one edge of the original to the other. It moves according to the circumferential speed. An electrostatic latent image is written on the photoreceptor surface that is engaged and passed through the exposure process. The photoreceptor bearing the electrostatic latent image is then engaged in a development process. 9 is a developing machine which is the main body of the developing process. At this time, the latent image is developed and visualized using toner having a polarity opposite to that of the photoreceptor. The photoreceptor carrying the toner image is moved and rotated to engage in the transfer process. 1o is a paper feed cassette for copy paper onto which toner is transferred, and from this...
The paper is fed to the transfer process section in synchronization with the rotation of the photoreceptor drum. Reference numeral 11 denotes a transfer charger, which transfers the toner on the photoreceptor onto the copy paper by applying an electric charge having a polarity opposite to that held by the toner to the back side of the copy paper. The copy paper onto which the toner has been transferred is moved to the next paper peeling process while remaining in close contact with the photoreceptor. Reference numeral 12 denotes an AC static eliminator that removes electrical charges from the copy paper, and the copy paper is peeled from the surface of the photoreceptor due to the rigidity and weight of the copy paper with the help of auxiliary means such as paper stock separation claws.

The copy paper that has been peeled off from the photoreceptor has toner on its surface. It is sent to the fixing process while retaining the transferred image. 13
1 is a fixing device that constitutes the fixing process, and fixing is generally accomplished by softening the toner with a heating roll and simultaneously pressing the toner against the surface of the copy paper.

The copy paper with the toner fixed thereon is then discharged outside the copying apparatus. - The photoreceptor that passes through the paper stripping process retains some residual toner that remains untransferred to its surface and moves on to the next cleaning process. 14 is a fur brush which is the main body of the cleaning process;
Here, the residual toner is removed from the surface of the photoreceptor. At the end of the copying process, the photoreceptor from which residual toner has been removed is moved to a static elimination process. Reference numeral 16 denotes a static elimination lamp, which is the main part of the static elimination process, and the photoreceptor is exposed to light to discharge all the electric charge existing on its surface, preparing it for the next charging process and starting the copying process. 1 cycle is completed.

The operation of the organic photoreceptor attachment traveling drum and the process that is disposed and engaged around it is as described above, but in this method, the photoreceptor layer is interrupted at the notch of the drum, so the size of the copy paper is smaller than the size of the copy paper. Since the area of the photoreceptor must be increased,
The diameter of the photosensitive drum is increased to 160 to 200 cm. Therefore, there is a problem that the copying apparatus itself becomes larger. To solve this problem, photoreceptor drums in which organic photoreceptors are directly applied to small-diameter aluminum drums have been commercialized, but at present, the durability of organic photoreceptors is only about 10,000 times. In addition, rotating the drum several times to engage each electrophotographic process in order to obtain a single copy shortens the life of the photoreceptor, increases replacement maintenance, and makes handling easier. Not desirable.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a photoreceptor traveling device that takes advantage of the advantages of organic photoreceptors and can constitute a small-sized copying device without shortening the life of the photoreceptor.

Structure of the Invention The photoreceptor traveling device of the present invention is a photoreceptor traveling device for traveling a belt-shaped photoreceptor using a two-axis roll system for a copying machine using an electrophotographic process, and comprises a main roll, a driven roll, and the main roll. An auxiliary roll is provided approximately in the center between the driven rolls, and in a portion where the belt-shaped photoreceptor supported and run by the three rolls is supported by the main roll, the developing process in the electrophotographic process is performed. , a photosensitive member engaged with a transfer process in the electrophotographic process in a portion supported by a driven roll and an exposure process in the electrophotographic process in a portion supported by an auxiliary roll; Since it is a body traveling device, the photoconductor drum part can be flattened and the exposure process can be placed in the center, and the development process and fixing process can be placed at both ends, making it possible to downsize the process implementation. Since mechanical precision can be maintained within a practically sufficient range in relation to the human body, it is possible to obtain a compact copying device with excellent image quality.

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

FIG. 2 is a configuration diagram of a photoreceptor traveling device and electrophotographic process elements disposed around it in an embodiment according to the present invention. In FIG. 2, 16 is a main roll that receives a driving force from another drive source (not shown) and causes the photoreceptor to travel; 17 is a driven roll that is provided parallel to and isolated from the main roll; 18 is a photoconductor processed into an endless belt shape, 19 is a joint portion of the photoconductor, and 20 is located approximately at the center between the main roll 16 and the driven roll 17, and is in contact with the back surface of the photoconductor 18 and is connected to the main roll. This is an auxiliary roll placed parallel to the These three rolls are each made of aluminum tubes, etc., and are supported by their respective spindles and arranged as described above. Appropriate tension (for example, 30 to 60 y for one stroke in the photoreceptor) is applied to the photoreceptor 18 by applying an isolating force. In Fig. 2, each of the process elements 6 to 16 corresponds to the process elements in Fig. 1 and performs the same function. The belt-shaped photoreceptor 18 that is
In the part supported by 6, there is a developing machine 9;
The portion supported by the driven roll 17 is configured to engage with the transfer charger 11, and the portion supported by the auxiliary roll 20 is configured to engage with the glass fiber lens array 6, respectively. In each of these process elements, the positional accuracy with respect to the photoreceptor is likely to cause image defocus, uneven development, and uneven transfer. It is made up of. Furthermore, when the electrophotographic process is implemented in a small size, there is a risk that the heat from the fixing device and exposure lamp, which serve as heat sources, may solidify the toner in the developing machine.To avoid this, in the present invention, the developing machine and the heat source are separated It has the advantage of being able to be placed in a position where it can be maintained. The next problem in the case of compact mounting is the relationship between the size of the document table 8 in FIG. 2 and the outer case of the copying machine that supports it.

FIG. 3 is a diagram illustrating this relationship. Reference numeral 8 denotes a document table made of 4 to 6 thick transparent glass, 6 an exposure lens, 21 an outer case, and 22 a document table 8 on the upper surface of the outer case 21. This is a guide rail for smooth movement. Original table 8
It is sufficient that the size of the document table is large enough to place a specified document, but this document table is one that moves from one edge of the document to the other with respect to the exposure lens, and therefore,
If the document table moves to the end depending on the position of the exposure lens relative to the outer case,
The following situation occurs. What is shown in this figure is that in case b, the portion where the guide rail fits is small, and therefore the weight of the document table glass plate is small.

When the weight of the document, such as a book, is taken into account, a large load is applied to a portion of the guide rail, resulting in a situation in which the document table does not move smoothly. To solve this problem, it is necessary to leave a sufficient distance between the guide rails, and to do so, the outer case must be made larger.
It is to determine the SOJ4 longevity, wrhrh, and fcfflfarb. Although the former is not desirable for compact packaging and the latter is preferable, this configuration can be easily created according to the present invention. According to the present invention, as described above, the photoreceptor can be flattened and run in an elliptical shape, and the height of the outer case can also be greatly reduced.

According to the present invention, rolls are used as the members that come into contact with the back surface of the photoreceptor in order to support it.

This is to reduce unnecessary friction between these members and the back surface of the photoreceptor, and to prevent abrasion powder and static electricity generated from the photoreceptor base or supporting member. The aforementioned abrasion powder and static electricity cause foreign matter to adhere to the back surface of the photoconductor, and the foreign matter adhesion results in unevenness on the surface of the photoconductor in the area supported by the roll, which engages the photoconductor. This is because it leads to a decrease in mechanical precision with each process element or deterioration of the photoreceptor, resulting in image disturbance.

FIG. 4 is a block diagram of a photoconductor moving device and electrophotographic process elements disposed around it in another embodiment of the present invention. The configuration in Figure 4 shows that the photoreceptor rotates once while the photoreceptor rotates twice.
When compared with the configuration shown in FIG. 2, the transfer charger 11 also serves as the main electric device, and the exposure lamp 7 also serves as the neutralizing lamp. Therefore, since the number of process elements is reduced, the features of the photoreceptor traveling device of the present invention can be more easily utilized in terms of compact packaging. The operation in the system of FIG. 4 is as follows. During the first rotation of the photoreceptor, the transfer charger 11 operates as a main charger, and the AC static eliminator 12 and fur brush 14 are paused to perform exposure and development. When the photoreceptor starts rotating for the second time, the transfer charger 11 performs the original transfer process, and then the AC charger 12 is activated for paper peeling static elimination and cleaning. The fur brush 14 works, and the mirror 23 is inserted between the optical path of the document table 8 and the exposure lens 6, and the light beam from the exposure lamp 7 passes through the exposure lens 6 to optically eliminate charges on the photoreceptor. During this time, the developing machine 9 is stopped and the copying process is completed.

Effects of the Invention As described above, the present invention is a photoconductor traveling device in which an auxiliary roll is added to a two-axis roll system to attach and travel a belt-shaped photoconductor, and the belt-shaped photoconductor is flattened in an oval shape and travels. , exposing the center of the photoreceptor.

The transfer and development processes are arranged at both ends, and while maintaining the high quality of the copied image, it takes advantage of the advantages of an organic photoreceptor and reduces the size and width of the copying device without impairing its printing life. This makes it possible to realize a simple copying device suitable for personal use.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a conventional photoreceptor traveling device, Figure 2, Figure 4.
The figure is a configuration diagram of a photoreceptor traveling device in an embodiment of the present invention.
FIG. 3 is a structural model diagram of a copying apparatus for explaining the present invention. 1... Aluminum drum, 2... Sheet-shaped photoreceptor, 3... Presser Board, 4... Spring,
6... Main charger, 6... Exposure lens,
7...Exposure lamp, 8...Document moving table, 9...Developer, 1o...Paper feed cassette, 11...Transfer Charger, 12...A
C Static eliminator, 13... Fixing device, 14...
Fur brush, 16... Static elimination lamp', 76.
...Main roll, 17...Mountain/Sub-S roll, 18.
...Endless bell)-shaped photoreceptor, 19...
... Seam, 2o... Auxiliary roll, 21...
...Outer case, 22...Guide rail, 2
3.Mountain/mirror.

Claims (1)

[Scope of Claims] 0) A photoreceptor traveling device that travels a belt-shaped photoreceptor using a two-axis roll system for a copying apparatus using an electrophotographic process, comprising: a main roll, a driven roll, and a gap between the main roll and the driven roll; An auxiliary roll is provided approximately in the center of the belt, and in a portion where the belt-shaped photoreceptor supported and run by the three rolls is supported by the main roll, the developing process in the electrophotographic process and the driven roll are carried out. The part supported by the auxiliary roll is engaged with the transfer process in the electrophotographic process, and the part supported by the auxiliary roll is engaged with the exposure process in the electrophotographic process. Photoreceptor traveling device. @) The photoreceptor traveling device according to claim 1, wherein the belt-like photoreceptor is an organic photoreceptor based on a polyester film.