JPS636574A - Electrophotographic printer - Google Patents

Abstract

PURPOSE:To miniaturize an electrophotographic printer by utilizing the internal space of a cylinder of a photosensitive drum, and internally installing an electrifier, a printing head, and a destaticizer. CONSTITUTION:A photosensitive film 2 is applied to the outside surface of a photosensitive drum 1, and the inside is hollow. In this space, the printing head 3, the electrifier 4, and the destaticizer 5 are fixed to a cylinder shaft 6 and installed internally. Each internal parts are provided at a prescribed distance against the photosensitive film 2, by which to the outer periphery of the drum 1, it may suffice that imaging system parts except the internal parts are installed, and accordingly, the printer can be miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrophotographic printer used for a computer terminal device, etc., and particularly to a small and compact electrophotographic printer.

[Conventional technology]

The conventional electrophotographic printer was published in Japanese Patent Application Laid-Open No. 57-171880.
As shown in FIG. 4, there is a charger 4 that charges the surface of the photosensitive drum 1, which is placed around a photosensitive drum 1 which normally records optical information, and which is surrounded by a photosensitive drum 1, which records optical information. A printing head 3 that prints information as an electrostatic latent image on the photosensitive drum 1, and a developing machine 1 that develops the electrostatic latent image.
4, a transfer device 15 for transferring developed information onto recording paper, a static eliminator 5 for removing static from the surface of the photosensitive drum 1, and a cleaner 16 for wiping the surface of the photosensitive drum 1.

[Problem that the invention seeks to solve]

In recent years, with the rapid emergence of electrophotographic printers, and with the trend toward light, thin, short, and small size, and especially with the progress of office automation, printers are often placed on individual office desks.
Miniaturization of component parts is almost at its limit, and for this reason, there is a problem in that it is difficult to make conventional printers to a size that meets the standards for office desks. Therefore, in order to achieve even greater miniaturization and density, a change in thinking was necessary.

[Means for solving problems]

The present invention has been made in view of the above problems.

The interior space of the cylinder of the photosensitive drum, which is the center of the printing system parts, is used to remove parts that cannot be installed inside, such as the developer, transfer unit, and cleaner, and store other parts such as the charger, print head, and remover. In addition to housing electric appliances inside, the photosensitive drum is made of a transparent material, and each interior component is fixed so that it will not rotate even if the cylindrical portion of the photosensitive drum rotates, thereby achieving the objective of compactness and density. be.

[Effect]

By the above means, a charger, a printing head, a static eliminator, etc. can be accommodated in a photosensitive drum.

The space occupied by these printing parts around the outside of the photosensitive drum can be reduced compared to the conventional art.

〔Example〕

As described above, the present invention fixes a hollow shaft to a housing, fixes the three internally possible parts of the printing system to this, and attaches a photoreceptor side plate to the hollow shaft via a bearing. The photosensitive drum is attached by fitting with a pin provided on the side plate of the photosensitive drum. Further, a gear is arranged on the outer periphery of the photosensitive drum side plate, and the driving force from the motor is transmitted through the gear to rotate the photosensitive drum. As a result, the photosensitive drum is rotated by the driving force of the motor, and the internal printing system parts remain stationary on the fixed shaft, making it possible to mount components inside the photosensitive drum, and also to mount these internal parts. By passing the wiring through the hollow shaft, the rotational movement of the photosensitive drum is not obstructed by the wiring.

1 to 3 are diagrams showing one embodiment of an electronic printer according to the present invention. In the same figure and FIG. 4, the same reference numerals indicate the same functional items. In the plan view, a photosensitive drum 1 has a photosensitive film 2 coated on its outer surface and is hollow inside. In this space, there is a printing head 3. Charger 4
．． 9 An electric appliance 5 is fixed to a cylindrical shaft 6 and installed inside. Each of the interior parts described above is arranged at a predetermined distance from the photoresist film 2, so that it is only necessary to mount the printing system parts other than the interior parts on the outer periphery of the photosensitive drum 1. The space occupied by the printing parts can be reduced, making it possible to make the printer more compact.

Also, Figure 2 is a sectional view showing the installation of the photosensitive drum.
As shown in the figure, the hollow shaft 6 is fixed to the housing 7,
A photoreceptor side plate 9 rotatable via a bearing 8 is provided on the hollow shaft 6, and the photoreceptor drum 1 is fitted and attached to the bin 10 of the photoreceptor side plate 9, thereby forming a shaft that transmits rotation from the motor. A gear 12 attached to the photosensitive drum 11 and a gear 15 integrated with the photosensitive drum side plate 9 mesh with each other to rotate the photosensitive drum 1. Furthermore, even if the photosensitive drum 1 rotates in a predetermined direction, the internal components must always remain stationary without rotating. It passes through the inside and comes out of the hollow shaft 6 and is connected to a terminal (not shown). As a result, the printing head 3. Charger 4. The static eliminator 5 can be mounted inside the photosensitive drum 1 without being affected by the rotation of the photosensitive drum 1.

FIG. 3 is a diagram showing the entirety of an embodiment of an electrophotographic printer according to the present invention. As shown in the figure, inside the photosensitive drum 1 is a printing head 3. Charger 4. A static eliminator 5 is housed,
The recording paper is fed from within the cassette by the transport path arrow 19, and in the case of a single sheet, by the arrow 19'. Further, the photosensitive drum 1 rotates in the direction of arrow A.

In the above configuration, first, the surface of the photosensitive drum 1 is neutralized by the static eliminator 5, and then the toner adhering to the surface is wiped away by the cleaner 16, and then the photosensitive drum 1 is newly charged by the charger 4. Next, an electrostatic latent image is printed on the photosensitive film 2 of the photosensitive drum 1 by the printing head 3,
After being developed by the developing device 14, the recording paper is led to the transport path arrow 19 or 19', and is pressed between the transfer device 15 and the photosensitive drum 1 to be printed.
The printer is sent out in the direction indicated by ' and printing ends.

FIG. 4 is an overall view of a conventional electrophotographic printer, and as is clear from a comparison of FIGS. 3 and 4, there are five high-voltage power supplies (a) 18. same(
b) Since a space is created to accommodate the package 18', the dimension in the left-right direction in FIG. 4 can be reduced, and by moving the package 20 downward, the height can also be reduced.

〔Effect of the invention〕

By carrying out the present invention, it is possible to house a part of the printing parts inside the photosensitive drum, and to effectively utilize the space around the photosensitive drum, thereby making it possible to downsize and compact an electrophotographic printer with a reasonable configuration. This makes it possible to realize this and has a remarkable effect on promoting OA.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the photosensitive drum of the electrophotographic printer according to the present invention, FIG. 2 is a sectional view showing the mounting portion of the photosensitive drum shown in FIG. 1, and FIG. 3 is the electrophotographic printer according to the present invention. FIG. 4 is a diagram showing the entire conventional electrophotographic printer. DESCRIPTION OF SYMBOLS 1... Photosensitive drum, 2... Photosensitive film, 3... Print head, 4... Charger, 5... Static eliminator, 6... Hollow shaft, 7... Housing, 8 ...Bearing, 9...Photoconductor side plate, 10...Bin, 11...Shaft, 12...Gear, 13...Wiring, 14...Developer, 15...Transfer device , 16...Cleaner, 17...Gear.

Claims (1)

[Claims] 1. A photosensitive drum that records optical information to be printed;
a charger that charges the surface of the photosensitive drum; a printing head that prints the information as an electrostatic latent image on the photosensitive drum; a developer that develops the electrostatic latent image; An electrophotographic printer comprising a transfer device for transferring onto a recording paper, a static eliminator for removing static from the surface of the charged photosensitive drum, and a cleaner for wiping the surface of the photosensitive drum, the charging device and the printing head. An electrophotographic printer, characterized in that at least one static eliminator is mounted within the photosensitive drum.