JPS62169169A - Electrophotographic printer - Google Patents

Abstract

PURPOSE:To prevent the jamming of paper so as to make the handling of an electrophotographic printer easier, by providing its photosensitive body closely to the central part of the printer, arranging a fixing device, control base plate, power source section, etc., at almost the same height as that of the photosensitive body or higher, and disposing an exposure source, cleaner, etc., to lower levels. CONSTITUTION:A heating type fixing device 6 has usually a calorific value corresponding to electric power of about 500W and is provided at a position which is the same as or higher than a photosensitive body 2 in height and close to a side face section 17 that is a paper discharging port, so as to prevent the convection 17 that is paper discharging port, so as to prevent the convection of heat to the minimum. A power source section 14 including a DC power source has a calorific value corresponding to about 70W and a control base plate 13 used for controlling the sequential operations of electrophotographic processes and as an interface with a host has a calorific value corresponding to about 60W. By mounting the fixing device 2, power source section 14, and control base plate 13 at levels higher than the photosensitive body 2, the surface of the photosensitive body 2, the surface of the photosensitive body 2 and toner in a developing device 4 are prevented from being deteriorated by high temperature. An exposure source 3 uses a laser beam, LED, etc., and a plastic lens used instead of an optical-glass lens is provided at a level lower than the photosensitive body 2 so as to make the lens to hardly receive thermal influences when this electrophotographic printer 1 is operated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrophotographic printer, and particularly to an electrophotographic printer suitable for downsizing the device and improving convenience in handling.

[Conventional technology]

Conventionally, electrophotographic machines include an invention disclosed in Japanese Patent Laid-Open No. 48-75041.

This cited invention relates to a laser beam, a light emitting diode (hereinafter referred to as LE).
This is an electrophotographic machine that uses an exposure source such as a light source such as a fuser, a control board, a power supply unit, etc., as it is a machine whose purpose is to copy originals, and the entire device is large in size. There was no major problem in securing the necessary margin for appropriately distributing power between the parts that were used and parts that were sensitive to temperature rise, such as the photoreceptor and exposure source.

On the other hand, with regard to printers for electronic computers and document processing machines, optical printers with daytime performance and low cost are being developed to replace dot-type and type-type printers, and there is a particular demand for the emergence of compact and dense electrophotographic printers. ing.

[Problem that the invention seeks to solve]

・The problems related to the downsizing of Seiko photo printers are not limited to problems.Due to the poor placement of components in the spaces inside the electrophotographic printer, heat generated from the fuser, IT power supply control board, etc. can cause the surface of the photoreceptor to There are harmful effects such as deterioration and adverse effects on the lens system in the S light source, the developing device, etc.

In order to solve the above-mentioned problems, the present invention uses two heat sources such as a fixing device, a heat source, a control board, etc. in order to minimize the rise in the ambient temperature of the photoreceptor, developer, exposure source, etc. This was done with the aim of improving the arrangement and configuration of the machine and making it more dense, as well as improving the paper feeding area, which accounts for the majority of machine failures, preventing paper jams, and improving ease of handling. be.

[Means to solve the problem]

The purpose of the above is to place the photoreceptor near the center of the electrophotographic printer, and place components with heat sources such as the fuser, control board, and power source at approximately the same height as the photoreceptor or above the photoreceptor. In addition, an exposure source, a cleaner, etc., which are sensitive to temperature rise, are arranged below, and a paper feed tray and a paper ejection tray are provided above and on the front side of the main body of the secondary photo printer, respectively, so that they can be attached to and removed from the main body of the printer. This can be achieved by configuring it like this.

[Effect]

In the present invention, by configuring as described above, parts such as the photoreceptor, exposure source, and developing section are protected against temperature rise.

It is extremely unlikely that the electrophotographic printer will receive heat shadows due to convection from the fixing device, control board, and power source located above the above-mentioned components, and by densely arranging one component, it is possible to downsize the electrophotographic printer.

〔Example〕

An example of the present invention will be explained below with reference to a 1 kg figure.

The electrophotographic printer 1 of this embodiment has a drum-shaped photoreceptor 2.
A companion charger 9. is arranged approximately at the center and charges the cylindrical surface of the photoreceptor 2. The charged surface of the photoreceptor 2 is exposed to light by an exposure source 3 such as a laser beam or an LED, and the resulting electrostatic latent image is developed by a developing device 4. A recording paper 10 is used for transferring the developed image formed by the toner. Vessel 5. An eraser 7 for erasing the electrostatic latent image on the photoreceptor 2 and a cleaner for removing developing toner remaining on the photoreceptor 2 after transfer are arranged around the photoreceptor 2. 6 is a fixing device, 18 is a radiation guard, 13 is a printing control board, and 14 is a power supply section.

Note that 12 is a paper feed tray, 10 is a recording paper, 11 is a paper feed mechanism, and 15 is a paper discharge tray.

In the above configuration, the control circuit 71 is controlled by the control board 13.
The fc print information travels through the exposure source 3 in the direction of the arrow, following the dashed line, and forms an electrostatic latent image on the cylindrical surface of the photoreceptor 2, which is charged by the charger 9. Photoreceptor 2 is indicated by arrow B
The electrostatic latent image is formed as a developed image by the toner in the developing device 4. The recording paper 10 housed in the paper feed tray 12P:J is separated and fed one by one by the paper feed mechanism 11.

joined to the developed portion on the photoreceptor 2 and the transfer device 5;
The developed image is printed on recording paper 10.

Next, when the recording paper 10 passes through the fixing device 6, the printed content is fixed, and the recording paper 10 is placed onto the paper output tray 15 via the side part 17, with the print side facing down.
The images are printed in the order in which they are printed.

The paper feed tray 12 and the main paper discharge tray 15 are detachably attached to the main body of the electrophotographic printer 10 at the upper surface portion 16 and the side surface portion 17, respectively.

The fixing device 6 can be of a heating type with a built-in electric heater or of a pressure type, but the former is used because the printing quality of the latter is inferior. The heating type fixing device 6 has a heat generation level corresponding to the power of about 500 W, and is located at or above the photoconductor 2 and near the side surface 17 which is the paper discharge port, and the shadow 411 of heat convection is generated. It is designed to minimize the Further, a radiation guard 18 is provided below the fixing device 6 to prevent heat radiation to the photoreceptor 2 and the like.

The power supply section 14 including the DC power supply has a heat generation amount of approximately 70W, and the control board 13 for 7-can operation in the electrophotographic process and the interface with the host has a heat generation amount of approximately 60W. By arranging it above the photoreceptor 2, it is possible to prevent the surface of the photoreceptor 2 and the toner in the developing device 4 from deteriorating due to high temperatures.

The fc* light source 3 uses laser beams, LEDs, etc., and is intended to be lightweight, dense, and low-cost.

A plastic lens is used instead of an optical glass lens, but the latter has an expansion coefficient one order of magnitude larger than the former, and its dimensional stability against temperature changes is inferior, so it is placed below the photoreceptor 2. The electrophotographic printer 1 is designed to be less likely to receive thermal j# during operation.

In short, one aspect of the present invention is the fixing device 6. Power supply section 14. Control board 1
3, at least one of the parts that become a heat source during operation of the electrophotographic printer 1 is arranged above the photoreceptor 2 at approximately the same height σ.

By arranging the exposure source 3, which is sensitive to temperature rise, at almost the same height and below the photoreceptor 2, it is possible to make the entire apparatus denser and more compact. As an example of arrangement, fixing device 6. Power supply s14.
All of the restraining substrates 13 are arranged above the photoreceptor 2.

Also, the developer 64 is also
Although an increase in temperature is not preferable, it is important to note that an increase in the temperature of the fuser 6° power supply section The photoconductor 2 and the control board 13 need to be located at least not above the control board 13, and also need to occupy a position that is functionally adjacent to the photoconductor 2 and convenient for toner replenishment. It is placed in the middle of the photoreceptor 2, slightly higher than the photoconductor 2.

By disposing the cleaner 8 below the photoconductor 2L, when cleaning toner remaining on the photoconductor 2 for next development, shadows 4 & 1 caused by toner scattering are minimized.

Next, recording paper 10 is fed from the set paper feed tray 12 to the upper surface 16 of the main body of the electrophotographic printer 1 .

By configuring the paper to be discharged from the side plate portion 17, the paper feeding path is shortened and simplified, and the cause of one paper jam is eliminated. Further, even if a paper jam should occur, an inspection opening (not shown in the drawings) is provided near the top surface 16 so that the paper feeding path can be inspected.

〔Effect of the invention〕

According to the present invention, the fixing device 6. Control board 13. By arranging the source section 14 at the same height or above the photoconductor, and by disposing the exposure source 3 at the same height or below the photoconductor 2,
Photoreceptor 2. In addition to preventing the temperature rise of the exposure source 3, it also realizes miniaturization of the electrophotographic printer 1.
2 and the paper output tray 15 on the upper surface 16 of the electrophotographic printer 1.
, by removably providing them on the side surface portion 17,
The shortening and simplification of the paper feed path eliminates the cause of paper jams, makes it easier to inspect the paper feed path, and improves the reliability of the machine.

Next, the printed recording paper 1 is placed on the paper output tray 15 (
Convenience was improved by collecting items in the order they were printed.

Further, the paper feed tray 12 and the paper discharge tray 15 are easily attached and detached, and the developer device 4 is easily replenished with toner σ, which provides good handling properties.

This provides the excellent practical effects described above.

[Brief explanation of drawings]

FIG. 1 shows a cross-sectional view of one embodiment of the invention. 1... Electrophotographic printer, 2... Photoreceptor, 3...
exposure source. 4...Developer, 5...Transfer device, 6...Fixer, 7
...Eraser, 8...Cleaner, 9...Charger,
10... Recording paper. 11...Paper feed mechanism, 12...Paper feed tray, 13...
- Control board, 14... Power supply section, 15... Paper ejection tray, 16... Top surface section, 17... Side surface section, 18... Radiation guard.

Claims (1)

[Scope of Claims] 1. An exposure source that forms print information as a latent image on a photoreceptor using a laser beam or a light emitting diode, the photoreceptor, a developer that develops the latent image, and a recording paper. In an electrophotographic printer, the printer includes a transfer device for transferring the developed image, a fixing device for fixing the transferred print content, a control board, and a power supply section, at least one of the fixing device, the control board, and the power supply section. An electrophotographic printer characterized in that the exposure section is disposed at the same height or above the photoconductor, and the exposure section is disposed at the same height or below the photoconductor. 2. The electrophotographic printer according to claim 1, wherein the developing device is disposed at the same height or above the photoconductor, and a toner cleaner is disposed below the photoconductor. 3. The electrophotographic printer according to claims 1 and 2, wherein the fixing device uses a heating type fixing device. 4. An electrophotographic printer according to claims 1 to 3, characterized in that a paper feed tray or a paper feed cassette is removably provided on the top surface of the electrophotographic printer, and a paper ejection tray is provided on the side surface thereof. .