JPS62270967A - Electrophotographic device - Google Patents

Abstract

PURPOSE:To easily execute a work such as the conversion of element parts due to a shelf life, the adjustment of each, a check or cleaning, etc., by forming main constituting part of an electrophotographic device to each unit so that it can be attached and detached to and from the body. CONSTITUTION:A photosensitive body 20, a developing part 67, a process part 69 containing a cleaning part 40, a transfer 24 for transferring a toner image generated by the process part 69, to transfer paper, an exposing part 70 for exposing the photosensitive body 20, a fixing part 49 for fixing transfer toner image, and a feed paper part 72 for feeding the transfer paper by one sheet each to the transfer part 24 are formed by each complete unit which can be attached and detached freely to and from a body substrate, respectively. To the surface of the photo-sensitive body 20, a charge is given by an electrifier 21, and the surface is exposed by a laser beam 66. In such case, the laser beam 66 is scanned (main scan) at high speed in the transverse direction of the photosensitive body 20 by a polygon al mirror 45 which is rotated by a polygonal mirror motor 46 being a known means, and also, the laser beam is modulated in accordance with an image signal. Accordingly, together with a rotation (subscan) of the photosensitive body 20, an exposure corresponding to a necessary image signal is executed, and a charge latent image corresponding to the image signal is formed on the surface of the photosensitive body.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to an electrophotographic apparatus such as a copying machine or an optical printer used in an electrophotographic method.

Conventional technology In recent years, optical printers such as copiers and laser printers using electrophotography have become widespread due to the expansion of ○A technology, and with this, the devices themselves have become smaller and more reliable.
Furthermore, there is a strong desire for ease of operation and maintenance, and since they are often used for various purposes, it has become necessary to be able to easily develop various functions.

An example of the conventional electrophotographic apparatus mentioned above will be described below with reference to the drawings.

FIG. 3 shows the structure of a laser printer, which is one of the conventional electrophotographic devices. In FIG. 3, 1 is a photoreceptor, 2 is a charger, 3 is a developer, 4 is a transfer device, 5 is a photoreceptor cleaner, 6 is a static eliminator, and 8 is a laser exposure means. 9 is a transfer paper; 10 is a transfer paper cassette that accommodates the transfer paper;
14 is a paper feed roller that feeds the transfer paper into the device one by one;
Reference numeral 16 denotes a timing roller for feeding the transfer paper to the transfer section in synchronization with the operation of the photoreceptor.

Problems to be Solved by the Invention However, in the above-mentioned electrophotographic apparatus, in addition to the fatigue life of the photoreceptor and developing material, damage to the fixing roller, and staining of the charger and exposure area due to toner, Toner scatters throughout the device, causing dirt, etc. Therefore, in order to maintain good print images, it is necessary to periodically replace the various consumable parts mentioned above and clean the inside of the device. Maintenance is required. However, in conventional electrophotographic devices, each component and part is configured on the main body board, so there are problems such as complicated operations and disassembly work required in the event of maintenance or failure. was.

Means for Solving the Problems In order to solve the above-mentioned problems, the electrophotographic apparatus of the present invention has the main components constituting the electrophotographic apparatus each forming a unit and being detachable from the main body board, In particular, regarding the paper feed section, the transfer paper power center that stores the transfer paper and the single sheet feed mechanism that feeds out the transfer paper one by one from the transfer paper power center are integrated into a unit, and the transfer paper fed out from the transfer paper cassette is The timing feeding means for feeding the paper to the transfer section is provided on the main body (substrate).

Effects The present invention has the above-described configuration, which makes it possible to replace parts at the end of their service life and maintain each part for each unit, as well as perform each operation necessary for electrophotography individually. By combining them into a single unit, they are constructed to further enhance credibility.

EXAMPLE Hereinafter, an electrophotographic apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a side cross section of an electrophotographic apparatus according to an embodiment of the present invention.

20 is a photoreceptor, 21 is a charger, 22 is a known developing roll, 23 is a toner, and 24 is a transfer section. The transfer section is a transfer belt 27 stretched between two rolls 25 and 26.
The transfer belt 27 is charged by a belt charger 28. 32, 33 is a registration roller, 34 is a paper feed cassette, 35 is a paper feed roller, 36 is a transfer paper, 40
42 is a cleaning blade, and 42 is a static eliminator, which is composed of a static eliminator lamp 43 and a reflecting mirror 44. 65 is a known laser exposure means, 45 is a polygon mirror, 46 is a motor for rotating the polygon mirror, and 47 is an imaging lens. The laser beam is reflected by reflection mirrors 48 and 49, as shown by the dashed line, and an image is formed on the photoreceptor. 49 is a fixing device;
50 is a pressure roller, and 52 is a heat roller, which has a heating fixing lamp 51 inside. 53 is a paper ejection roller.

The operation of the electrophotographic apparatus configured as described above will be described below with reference to FIG.

In FIG. 1, the photoreceptor 20, the fuser roller, 50.5
2. The transfer belt 27 rotates in the directions of the arrows.

The transfer belt 27 contacts the photoreceptor at the transfer section 62,
It operates at approximately the same speed as the photoreceptor.

First, a charge is applied to the surface of the photoreceptor 20 by the charger 21 . Next, it is exposed to laser light 66.

At this time, the laser beam 66 is scanned at high speed (seed scanning) in the width direction of the photoreceptor 20 by a polygon mirror 45 rotated by a polygon mirror motor 46, which is a known means, and the laser beam is used as an image signal. Since the light is modulated in accordance with the image signal, exposure is performed in conjunction with the rotation (sub-scanning) of the photoreceptor in accordance with the required image signal, and a charge latent image in accordance with the image signal is formed on the surface of the photoreceptor. As the photoreceptor 20 rotates, the latent charge image is developed in the developing section 67, and a toner image is created on the surface of the photoreceptor.

On the other hand, the transfer paper 36 is fed into the apparatus by the paper feed roller 35.
It is supplied and is pressed against the stopped registration rollers 32 and 33 and waits. As shown in the second diagram, when the registration rollers 32 and 33 start rotating, the transfer paper 36a is fed between the transfer belt rollers 26 and 31.

At this time, since the transfer belt 27 is charged by the charger 28, the transfer paper 36a is transferred to the belt 2 as shown in the figure.
The toner 23a on the photoreceptor is transferred onto the transfer paper at the transfer section 62, as shown at 36b.

When the transfer paper is further fed, the transfer paper is peeled off from the belt by the rigidity of the transfer paper at the belt roller 25 portion, passes through the guide plate 54, enters the fixing section, is fixed, and is then discharged from the machine. (36C) Toner 23 remaining on the angry light body
b is cleaned by the cleaning blade 40. Furthermore, the photoreceptor 20 is neutralized by the static eliminating lamp 43 in the static eliminating section 42, completing one cycle, and is charged again to enter the next cycle.

Furthermore, the unit configuration of each main part in FIG. 1 will be described.

In FIG. 1, 6th is a main body substrate, 69 is an image forming process unit substrate including the photoreceptor 20, developing device 67, and cleaning section 41, 70 is an exposure section substrate, 58 is a fixing section substrate, and 72 is a transfer paper supply unit. The substrate 29 is a transfer unit substrate.

FIG. 2 shows the situation when each unit of this configuration is removed from the main body board.

The attachment/detachment mechanism between each unit and the main body board is a known means, and a description thereof will be omitted. Regarding the power source of each unit, each unit may have its own power source, or each unit may be connected to the power source of the main body when attached to the main body.

Further, the configuration of each unit is not limited to this embodiment, and the same can be applied even if it is further subdivided.

Effects of the Invention As described above, the present invention has the main constituent parts of an electrophotographic device each unitized and made detachable from the main body.
Work such as conversion due to the lifespan of elemental parts, adjustment, inspection, and cleaning of each part becomes easier.

Furthermore, the transfer paper feeding section is equipped with a cassette that accommodates the transfer paper and a single-sheet feeding mechanism that feeds out the transfer paper one sheet at a time from the cassette, which prevents paper feeding failures due to dimensional variations in the cassette, etc. It has effects such as being able to improve trustworthiness.

[Brief explanation of the drawing]

FIG. 1 is a side view of an embodiment of the present invention, FIG. 2 is a side view showing its unit configuration, and FIG. 3 is a side view of a conventional example. 29...Transfer unit, 58...Fixing unit, 68...Main board, 69...
...Process section, 70...Exposure section, 72...
...Transfer paper feeding section.

Claims (2)

[Claims] (1) A process section including a photoconductor, a developing section, and a cleaning section; a transfer section that transfers the toner image created in the process section onto transfer paper; an exposure section that exposes the photoconductor; and the transfer toner An electrophotographic apparatus characterized in that a fixing section that fixes an image and a paper feeding section that supplies transfer paper one sheet at a time to the transfer section are each made into a complete unit that can be attached to and detached from a main body substrate. (2) The paper feeding means consists of a transfer paper cassette that accommodates transfer paper and a single-sheet feeding mechanism that feeds out the transfer paper one by one from the transfer paper cassette, and synchronizes the transfer device with the process section to feed the transfer paper into the transfer section. Claim 1 (1) characterized in that the timing sending means for feeding is provided on the main body board.
) The electrophotographic device described in item 2.