JPS5911910B2 - Photosensitive drum driving method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for driving a photosensitive drum in an electrophotographic recording apparatus.

FIG. 1 is a schematic diagram of a conventional electrophotographic recording apparatus.

In FIG. 1, 1 is a photosensitive drum, and this photosensitive drum 1
is uniformly charged with a corona charger 2, selectively irradiated with light using a laser 3 or the like to create an electrostatic latent image, developed with toner in a developer 4, and recorded using a transfer corona charger 5. paper 6
Transfer toner to. This toner is fixed onto the recording paper 6 by the fixing device 7. On the other hand, the photosensitive drum 1 is returned to its original state by the charge erasing charger 8 and the cleaner 9. A blade, a fur brush, or the like is used as the cleaner 9. Next, the effect will be explained.

Since the photosensitive member constituting the photosensitive drum 1 is constantly rubbed by the cleaner 9, mechanical scratches and toner filming occur. This is the main cause of early deterioration of the photoreceptor.
However, a more detailed study revealed that the areas to which the toner adhered had less friction and less deterioration. Since the transfer efficiency cannot be 100% in the transfer corona method, residual toner always occurs in the printed area.
Since this residual toner acts as a lubricant, there is little friction with the cleaner in the printed area, but scratches and toner filming due to friction are likely to occur in the non-printed area where there is no residual toner. Copying machines are used in various ways and the objects to be copied are not concentrated in the areas where friction occurs, but with electrophotographic recording devices that use laser 3 etc. is also constant, so the printed portion and non-printed portion are fixed. Therefore, scratches due to friction and toner filming quickly occur in the non-printing areas, resulting in streak-like stains on the recording paper 6. This invention was made to eliminate the above-mentioned drawbacks, and the photosensitive drum is moved in the axial direction every certain number of recordings, so that the non-printed areas are not concentrated in one place.

This invention will be explained below. FIG. 2 is a schematic perspective view showing the configuration of an embodiment of the present invention.

In FIG. 2, 10 is a counter, 11 is an axial feed motor, 12 is a gear, 13 is a drum rotation motor, and 14 is a rotation gear. Next, the operation will be explained.

The counter 10 counts the number of recorded sheets, and the axial feed motor 11 is operated every predetermined number of counts, and the gear 12
The photosensitive drum 1 is moved in the axial direction (indicated by the arrow in the figure) at a pitch that is greater than or equal to the non-printing width and less than or equal to the character width. Since the non-printing width is usually 1/4 to 1/10 of the printing width, the number of pitches is determined accordingly. In addition, the axial feed motor 11
is capable of forward and reverse rotation, so after reaching the final number of stages, it moves one stage at a time in the opposite direction. Experiments were conducted using a laser printer that writes on a Se-Te photosensitive drum using a He-Ne laser, develops it with a one-component magnetic toner, and cleans it with a blade. Adhesion of toner was observed in areas corresponding to non-print areas.

Then, after 3,000 to 5,000 copies, streak-like stains began to appear, and by the time 10,000 copies were printed, it became unacceptable as normal recording. Next, when this invention was applied and an experiment was carried out by shifting the width of the non-printing part in the axial direction (character spacing 0.5 mm) every 1,000 sheets, no streak-like stains were generated even after 10,000 sheets were printed.

As explained above, the present invention moves the photosensitive drum in the axial direction at a pitch that is greater than or equal to the non-printing width and less than or equal to the predetermined character width for each specified number of uses, and the locations of the printed and non-printed areas are not fixed. This has the advantage that deterioration points are not concentrated and the lifespan is extended.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the configuration of a conventional electrophotographic recording apparatus, and FIG. 2 is a schematic perspective view of the configuration of an embodiment of the present invention. In the figure, 1 is a photosensitive drum, 2 is a corona charger, 3 is a laser, 4 is a developer, 5 is a transfer corona charger, 6 is a recording paper, 7
Is it here to stay? , 8 is a charger for erasing charges, 9 is a cleaner, 10
is a counter, 11 is an axial feed motor, 12 is a gear, 1
3 is a drum rotation motor, and 14 is a rotation gear.

Claims (1)

[Claims] 1. In an electrophotographic recording device in which an electrostatic latent image of a predetermined character width formed on a photosensitive drum is visualized and then transferred to a recording paper, and residual toner after the transfer is removed by a cleaner, the photosensitive drum is moved in an axial direction. A method for driving a photosensitive drum, characterized in that the photosensitive drum is moved at a pitch that is greater than or equal to a non-printing width and less than or equal to the predetermined character width every time a prescribed number of recordings are made.