JPS63194279A - Electrophotographic recorder - Google Patents

Abstract

PURPOSE:To prevent toner from being stuck to the wire of an electrifying part and a stabilizing plate in an electrifying part by providing a thin plate- shaped permanent magnet on the inside surface of the stabilizing plate. CONSTITUTION:A charger 13 is a groove-shaped member extended in parallel with the axis of a photosensitive drum and is provided with a metallic stabilizing plate 13b and a charger wire 13a for corona discharge, and a thin plate- shaped permanent magnet 13c is stuck to the inside surface of the bottom of the stabilizing plate 13b. One-component toner scattered around the charger 13 is attracted to the magnet 13c. Thus, toner is prevented from being stuck to the charger wire 13a and the stabilizing plate 13b, and the discharging potential of the charger is secured to give a prescribed charging potential to the photosensitive body, and distinct recorded images are obtained.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to an electrophotographic recording apparatus that performs recording by attaching one-component toner to an m-image formed on a photosensitive drum and transferring it onto printing paper. [Prior Art] In an electrophotographic recording system used in copying machines, printers, etc., a recording section having a configuration as shown in FIG. 3 is used. That is, a cylindrical photosensitive drum 2 having a photosensitive layer on its surface is rotated (in the direction of arrow B in the figure), and a necessary positive or negative potential is applied to the photosensitive drum by discharging in the charging section charger 3 ( charging process), then irradiation with light (arrow C) that forms characters and images from the exposure section 4

[7] Then, in the developing section 5, one component is charged to the same polarity as the photoreceptor. The toner is attached to the latent image area of the photoreceptor (development process),
Furthermore, in the transfer section 6, the one-component toner adhered to the latent image area on the printing paper 10, which is charged to the opposite polarity to the one-component toner, is sucked to form a transferred image (transfer process), and the one-component toner is charged to the opposite polarity to the one-component toner (transfer process). A configuration is adopted in which the binder in the toner is solidified and the one-component toner is fixed on the printing paper 10 (fixing process). At this time, the photosensitive drum 2, which continues to rotate, removes the one-component toner remaining on the photosensitive drum in the cleaning section 7, and uses a static eliminating lamp (eraser) 9.
The surface potential is returned to zero and sent to the next charging process. [Problems to be Solved by the Invention] In a conventional electrophotographic recording device having a recording section configured as described above, the fine powder of one-component toner that is mechanically removed from the photosensitive drum 2 by the cleaner 7 is The powder smoke is scattered around the photosensitive drum, and the powder smoke is carried around the charging section 3 by the airflow generated by the rotation of the photosensitive drum. For this reason, the one-component toner adheres to the charger wire and stabilizer plate that make up the charging section 3 and prevents its discharge, resulting in a disadvantage that the charging potential of the photoreceptor in the charging section decreases and the recorded image becomes unclear. have. An object of the present invention is to eliminate the drawbacks of the conventional electrophotographic recording apparatus as described above, and to prevent single-component toner from forming a layer on the charger wire and stabilizer plate of the charging section, thereby producing clear recorded images. The object of the present invention is to provide an electrophotographic recording device that can be obtained. [Means for solving the problem] The electrophotographic recording device of the present invention includes a photosensitive drum having a photosensitive layer on its surface, and a character or image on the photosensitive drum to which the band τj1 potential is applied. an exposure section that forms a latent image with a changed potential value by irradiating light representing the potential;
a developing section to which the component toner is attached;
a transfer section that transfers the component toner to printing paper; a constant gradient section that fixes the transferred one-component toner; and a cleaning section that removes the one-component toner remaining on the photosensitive drum.
The charging section includes a recording section having a static elimination lamp that brings the photoconductor to zero potential; The electrophotographic recording device has a charger wire that penetrates the space inside the stabilizer, and the stabilizer includes a thin permanent magnet on the inner surface of the stabilizer. [Example] Next, regarding an example of the present invention, IS! /! This will be explained in detail with reference to the following. FIG. 2 is a perspective view of a charging unit charger used in an embodiment of the present invention, and FIG. 1 is a sectional view taken along line A-AIvJ1 in FIG. As shown in FIGS. 1 and 2, the charger ]3 is
A metal stabilizing plate 13b, which is a groove-shaped member with a U-shaped cross section and extending parallel to the axis of the photosensitive drum;
The internal space is 5XA L in the longitudinal direction, and the charger wire 13a is connected to an applied power source to perform corona discharge.A thin plate permanent magnet 13C is fixed to the inner surface of the bottom part of the stabilizer plate 13b. are doing. In an electrophotographic recording device, one-component toner adheres to a photoreceptor in a developing section by being attracted to and conveyed by a magnetic roller provided inside the developing section. Therefore,
In the recording unit having the charger 13 configured as described above, the one-component toner scattered around the charger 130 is attracted to the magnet 13C and the charger wire 1
3a and the stabilizer plate 13b. This makes it possible to secure the discharge voltage of the charger and charge the photoreceptor to a predetermined potential. Note that the above-mentioned magnet 13C is not necessarily the stabilizer plate 13b.
They do not have to be continuous over the entire length, but may be several short fragments arranged linearly at appropriate intervals. [Effects of the Invention] As explained in detail above, the electrophotographic recording device of the present invention allows the mono-component toner to be absorbed by the magnet provided in the charger to absorb the mono-component toner scattered around the charger. This has the effect of preventing adhesion to the charger wire and stabilizer plate. Therefore, it is possible to secure the discharge potential of the charger and apply a predetermined charging potential to the photoreceptor, resulting in the effect that a clear recorded image can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a charging section according to an embodiment of the present invention, and is a cross-sectional view taken along the line A-A in FIG. 2. FIG. 2 is a perspective view of the charging section in FIG. FIG. 2 is a configuration diagram showing a recording section of a photographic recording device. 2...Photosensitive drum, 3.13...Charging section charger, 4...Exposure section, 5...
Developing section, 6... Transfer section, 7... Cleaning section, 8... Fixing section, 9... Static elimination lamp,
10... Printing paper, 13a... Charger wire, 13b... Stabilizer, 13C...
...Magnet, $f'm grass 2 sides

Claims (1)

[Scope of Claims] A photoconductor drum having a photoconductor layer on its surface, a charging unit that applies a predetermined charging potential to the photoconductor, and a charging unit that displays characters or images on the photoconductor to which the charging potential is applied. an exposure section that irradiates light to form a latent image with a different potential value; a development section that attaches one-component toner to the latent image; and a transfer section that transfers the attached one-component toner to printing paper. ,
a fixing unit that fixes the transferred one-component toner;
The recording unit includes a cleaning unit that removes the one-component toner remaining on the photosensitive drum, and a static elimination lamp that brings the photosensitive member to zero potential, and the charging unit has a “U”-shaped cross section. An electrophotographic recording device including a metal stabilizer extending in the axial direction of the photosensitive drum and a charger wire penetrating the space inside the stabilizer, further comprising a thin permanent magnet on an inner surface of the stabilizer. An electrophotographic recording device characterized by: