JPS60140377A - Photosensitive body running device - Google Patents

Abstract

PURPOSE:To peel off naturally a transfer paper by adding an auxiliary roll to a double spindle roll system. CONSTITUTION:An auxiliary roll 20 is positioned in about the center between a main roll 16 and a driven roll 17 and has a larger diameter than that of the main roll or the driven roll 17, inscribed to the rear side of a belt-shaped photosensitive body 18, and also provided in parallel to the main roll. Also, this device is constituted so that the belt-shaped photosensitive body 18 supported and made to run by said three rolls is engaged to a developing device 9, a paper peeling process, and a glass fiber lens 6, in the part supported by the main roll 16, in the part supported by the driven roll 17, and in the upper part of the part supported by the auxiliary roll 20, respectively. By making a diameter of the driven roll 17 small-sized as mentioned above, a copying paper can be peeled off easily from the photosensitive body 18 by only rigidity and empty weight of the copying paper.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a photoreceptor traveling device used in a copying machine using an electrophotographic process.

2. Description of the Related Art Structures and Problems Thereof In recent years, copying devices using electrophotographic processes have been widely used, and recently, products aimed at personal use are also appearing. An important element for products aimed at personal use is that they are small and easy to handle.

As a photoreceptor for 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 have
Since it does not contain harmful or polluting elements, it is 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 a polyester film (for example, Mylar) with a thickness of about 100μ and 10Q is coated on the surface.

The inner and outer aluminum drums are coated with a vapor deposition layer, and then an organic photosensitive material is applied to a thickness of 10 to 15 μm to form a sorted shape, which is then wound around an aluminum drum to form a photoreceptor drum. There is.

FIG. 1 explains this traveling method, and is a block diagram of the photosensitive drum and the electrophotographic proscene elements disposed around it. 1 is an aluminum drum that rotates by receiving power from another drive source (not shown), and the circle f; 1)
There are some cracks on the surface.

Two sheet-like photoreceptors are rolled up around an aluminum drum 1, the end portions of which are fitted into the notches of the aluminum drum 1, and fixed with a presser plate 3. The presser plate 3 is urged by a spring 4 toward the upper middle of the aluminum drum 1, thereby applying an appropriate tensile force to the photoreceptor. A main charger 5 applies a uniform charge to the surface of the photoreceptor 2. The operation of the electrophotographic process will be explained by rotating the photoreceptor drum 1 in a clockwise direction.Charging the surface of the photoreceptor 2 is the starting point of the copying process, and then the exposure process begins. 6 is an exposure lens, 7 is an exposure lamp,
8 is a document moving table. A glass fiber lens array is often used as the exposure lens in small-sized copying machines. Therefore, the document to be copied is placed on a moving document table, and the photosensitive drum 1 is placed against the lens from one end of the document to the other. is moved according to the circumferential speed of 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 subjected to a development process. 9 is a developing machine which is the main body of the developing process. Here, 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 the transfer process.

1Q is the paper feeding power cent of the copy paper onto which the toner is transferred, and from this, the copy paper is fed to the transfer process section in synchronization with the rotation of the photosensitive drum 1. Reference numeral 11 denotes a transfer charger, which applies an electric charge having a polarity opposite to that held by the toner to the back side of the copy paper, thereby transferring the toner on the photoreceptor to the copy paper. The copy paper onto which the toner has been transferred is moved to the next paper peeling process 11 while being in close contact with the photoreceptor. Reference numeral 12 denotes an AC static eliminator which removes the electrical charge on the copy paper, and the copy paper is peeled off from the surface of the photoreceptor due to the rigidity and weight of the copy paper while relying on auxiliary means such as a paper peeling wind. The copy paper that has been peeled off the photoreceptor is sent to a fusing process that retains the toner image on its surface. Reference numeral 13 denotes a fixing device constituting the fixing process, and fixing is generally accomplished by softening the toner with a heating roll and simultaneously applying it to a copy sheet under pressure of 1 mK (VC). Then, the sandpaper with the toner fixed thereon is discharged outside the copying apparatus. On the other hand, the photoreceptor that has passed through the paper peeling process moves on to the next cleaning process with residual toner remaining on the surface without being transferred. Reference numeral 14 denotes a fur brush which is the main body of the cleaning process, and 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 destaticization process. Reference numeral 15 denotes a static elimination lamp which is the main part of the static elimination process, and the photoreceptor is exposed to light to discharge any charge present on its surface, preparing it for the next charging process and starting the copying process. 1 cycle is completed.

The operation of the process in which the organic photoreceptor is mounted and is disposed and engaged around the traveling drum is as described above, but in this method, the photoreceptor layer is interrupted at the notch of the drum, so the copy paper is Since the area of the photoreceptor must be made larger than its size, the diameter of the photoreceptor drum is increased to 150 to 200 mm. Therefore, there is a problem that the copying apparatus itself becomes larger. In order to solve this problem, photoreceptor drums have been commercialized in which organic photoreceptors are directly coated on small-diameter aluminum drums, but at present, the printing capacity of organic photoreceptors is only about 10,000 times. Therefore, having to rotate the drum several times to engage each electrophotographic process to obtain a single copy results in shorter photoreceptor life, increased replacement maintenance, and increased handling. This is not preferable from this point of view.

OBJECTS OF THE INVENTION An object of the present invention is to provide a photoreceptor traveling device that can constitute a small-sized copying apparatus by taking advantage of the advantages of an organic photoreceptor without shortening its life.

Composition of the Invention The photoreceptor traveling device of the present invention is configured to travel a belt-shaped photoreceptor using a two-axis roll system, and includes a main roll, a driven roll, and a substantially medium heat section between the main roll and the driven roll. An auxiliary roll having a diameter larger than both of these rolls is provided, and the bell-shaped photoreceptor supported and run by the three rolls is supported by the main roll.
In the 'L7) section, the developing process in the electrophotographic process is carried out, and in the part supported by the driven roll, the 'I-b: paper peeling process in the child photographic process (
1 process, and in the part supported by the auxiliary roll, an exposure process in the electrophotographic process on one side supported by the auxiliary roll, and a transfer process in the electrophotographic process on the other side supported, respectively. The photoreceptor drum part is oval, and
Exposure process at the top of its central part.

By locating the transfer process in the lower part of the center and the development process and fixing process in both sides, it is possible to miniaturize the process implementation. Since this can be maintained within a practically sufficient range, the present invention provides a compact copying apparatus 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 one embodiment based on the present invention. In FIG. 2, 16 is another driving source (
17 is a driven roll provided parallel to and isolated from the main roll, and 18 is an endless belt-like structure with zero force.
The photoconductor 19 is located at the joint part of the photoconductor, and 20 is located approximately at the center between the main roll 16 and the driven roll 17, and has a larger diameter than both of the rolls. This is an auxiliary roll that is inscribed and arranged parallel to the main roll. These three rolls are each made of an aluminum tube or the like, and are supported by their respective spindles and arranged as described above.The main roll 16 and the driven roll 17
A force is applied between the supporting shafts of the photoconductor 18 to isolate them, and an appropriate tension is applied to the photoconductor 18 (for example, the photoconductor Ill I C1
3o~60g) is applied for l+. In FIG. 2, process elements 6 to 15 correspond to the process elements in FIG. 1 and perform similar functions.

However, regarding the arrangement, the belt-shaped photoreceptor 18 supported and run by the three rolls is supported by the main roll 16, and the developing device 9
In the part supported by the driven roll 1, the paper peeling process is carried out, and in the part supported by the auxiliary roll 20, the upper part is the glass fiber lens 6, and the lower part is the L ear band 2 roof 11. They are structured so that they fit together. 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. , so as to maintain the desired accuracy. By supporting the belt-like photoreceptor 18 from four locations (top, bottom, left, and right) in contact with its back surface, it is possible to eliminate slack in the belt-like photoreceptor 18 and prevent it from meandering. In the configuration shown in FIG. 2, the length of 4.1 mm can be increased by making the diameter of the driven roll 17 smaller (for example, 20 mm or less), thereby increasing the rigidity of the copy paper.
It is possible to easily separate the copy paper from the photoreceptor using only its own weight. Therefore, an AC static eliminator and its power source are unnecessary, and a great advantage is obtained in terms of compact packaging. Furthermore, when the electrophotographic process is implemented in a small size, there is a risk that the heat sources of the fixing device and the exposure lamp will solidify the toner in the developing device.
This has the advantage that the developing machine and the heat source can be placed in a position where the distance can be maintained.

The next problem in the case of compact implementation is the relationship between the sizes of the document table 8 in FIG. 2 and the outer case of the copying machine that supports it.

Figures 3fa) and 3(b) are diagrams explaining this relationship, in which 8 is a document table made of transparent glass with a thickness of 4 to 5 mm;
21 is an exposure lens, 21id is an outer case, and 22 is a guide rail for smoothly moving the document table 8 on the upper surface of the outer case 21. The size of the document table 8 is sufficient as long as it is large enough to place a predetermined document, but this document table moves from one edge of the document to the other edge with respect to the exposure lens, Therefore, depending on the position where the exposure lens is set with respect to the outer case, when the document table moves to Z:5, the states of νC as shown in FIGS. 3(a) and 3(b) occur. What is shown in this figure is that in the case of (b), there are fewer parts where the guide rail is fitted, and therefore,
When the weight of the document table glass plate and the weight of the original, such as a book, are taken into consideration, 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 this, the outer case must be made thicker, or the exposure lens must be placed in the center of the case. .

The former is not desirable for compact packaging, and the latter is preferable; however, according to the present invention, this configuration can be easily created. According to the present invention, as described above, it is possible to run the photoreceptor 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 from the back side to support the photoreceptor. this is,
By reducing unnecessary friction between these parts and the back surface of the photoreceptor, it is possible to stop abrasion powder generated from the photoreceptor base or supporting part and to prevent the generation of static electricity. 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 portion supported by the roll, which causes each part that engages with the photoconductor to become uneven. This is because it causes a decrease in mechanical precision with process elements or deterioration of the photoreceptor, resulting in image disturbance.

FIG. 4 is a configuration diagram of a photoreceptor traveling device and electrophotographic process elements disposed around it in another embodiment based on the present invention. The configuration shown in Figure 4 is a system in which one copying process is completed during two rotations of the photoreceptor, and when compared with the configuration shown in Figure 2, 11 transfer chargers also serve as upper belt TL devices, making it even more effective. It is.

Therefore, a single charger of 11 can perform the copying process f.
The features of the photoreceptor traveling device of the present E31J can be easily exploited in terms of compact packaging. Figure 4 Riki 2 V Otsu L・Keru motion f/I: &:i The following is Shi・ri.

In the first cycle 11 of the photoreceptor, the charger 11 operates as a main charger and performs exposure and development. The blank 14 and the IL lamp 15 are stopped and the next transfer process begins. When the photoreceptor starts rotating for the second time, the charger 11 operates as a transfer device to perform transfer. Next, the exposure and development processes are stopped, the fur brush 14 is operated 1 for cleaning, and the charge removal lamp 16 removes the charge from the photoreceptor 8, and the copying process is completed. The toner collected by the fur brush 14 is guided to the developing device 9 and used again as a developer.

Effects of the Invention As described above, the present invention is a photoconductor traveling device in which an auxiliary roll is added to a biaxial roll system, and a belt-shaped photoconductor is attached and travels, and the belt-shaped photoconductor is run in an oval shape. ,
Exposure is carried out on the upper part of the medium-heated part of the photoreceptor, transfer is carried out on the lower part, and paper peeling and development processes are arranged on both ends. The diameter of the driven roll is 420φ.
By pressing the following], the nature of the copy paper 1rlJ =
[This is what made I possible. Furthermore, while maintaining a high quality level of copied images, it is possible to make the copying machine extremely compact by taking advantage of the advantages of the photoconductor and without compromising the life of the printing press. This makes it possible to realize a simple copying device aimed at personal use.

[Brief explanation of the drawing]

FIG. 1 is a (1'4) diagram of a conventional photoconductor traveling device, and FIG. 2 is a configuration diagram of a photoconductor traveling device according to an embodiment of the present invention.
3(a) and 3(b) are structural model diagrams of a copying apparatus for explaining the present invention, and FIG. 4 is a structural diagram of a photoreceptor traveling device in another embodiment of the present invention. 6...Exposure lens, 7...Exposure lamp,
8...Original table, 9...-Developer, 10...
Paper feed cassette, 13... Fuser, 14... Far plan, 16... Static elimination lamp, 16...
Main roll, 17...Following roll, 18...
Endless belt-shaped photoreceptor, 19... photoreceptor joint, 2o... auxiliary roll, 21... outer case, 22... guide rail. Name of agent: Patent attorney Toshio Nakao et al.
1 Figure 2! (α) θ 22 Figure 4 ρ

Claims (2)

[Claims] (1) Used in a copying apparatus using an electrophotographic process, configured to run on a belt-shaped photoreceptor using a biaxial roll system, and with a main roll, a driven roll, and an approximately central portion between the main roll and the driven roll. The belt-shaped photoreceptor is provided with an auxiliary roll located at and having a diameter larger than both of these rolls, and is supported and run by the three rolls,
The portion supported by the main roll is supported by a developing prosthesis in the electrophotographic process, and the portion supported by the driven roll is supported by a paper peeling device in the electrophotographic process and an auxiliary roll. a photoreceptor which is engaged with an exposure process in the electrophotographic process on one supported side thereof and a transfer process in the electrophotographic process on the other supported side; Traveling device. (2) The photoreceptor traveling device according to claim 1, wherein the heald-like photoreceptor is an organic photoreceptor based on a polyester film.