Processing box

Abstract

The invention provides a processing box. The processing box comprises a toner cartridge, a developer roller, a doctor blade, a photosensitive drum, and a developing zone axial partitioning structure; the toner cartridge is provided with a toner outlet; the developer roller can be rotatablely arranged on the toner outlet; the doctor blade controls the thickness of the toner layer on the surface of the developer roller; the photosensitive drum sends toner to the photosensitive drum; and the developing zone axial partitioning structure is provided with a toner partitioning width in the axial direction of the photosensitive drum and partitions a toner passage from the toner outlet to the photosensitive drum in the toner partitioning width. The processing box with a large breadth is changed into the processing box which meets the small-breadth printing requirement by designing the developing zone axial partitioning structure and reducing the sending width of the toner. Under the condition that the whole structure of the processing box is not changed, the partial structure is improved, and the processing box which avoids printing defects and meets small-breadth printing requirements is obtained.

Description

technical field [0001] The invention relates to a laser printer processing box, which is especially suitable for the processing box used in the printer capable of printing small-size paper. Background technique [0002] In the imaging device of a laser printer, the process cartridge is the most important consumable part. The process cartridge lays toner on the electrostatic latent image formed on the photosensitive drum for development. The toner consumed for development is provided by the powder bin in the process cartridge. . The process cartridge consists of a drum unit and a developer unit. A drum assembly consists of at least the photosensitive drum and usually a charge roller and a cleaning blade. The developing assembly includes at least a powder bin and a developing roller, as well as a powder feeding roller and a powder outlet knife. The structure of the process box is divided into two types: integrated type and split type: the integral type process box, the drum...

AI Technical Summary

Problems solved by technology

However, if you directly use A4 (or A3) format processing cartridges to print small-format paper, some printing defects are prone to occur: generally, the printable width of A4 format is about 210mm. According to the principle of laser printing, the width of the developing roller in the axial direction, The printable area of ​​the photosensitive drum in the axial direction must reach at least 210mm, while the A5 format only needs to print about 148mm, which makes the areas at both ends of the developing roller (that is, the area beyond 148mm) always participate in the development, but the toner will not be When the toner is transferred to the photosensitive drum and A5 paper is printed for a long time, the toner will accumulate in the area at both ends of the developing roller, or even float out, or transfer to the non-printing area, which will affect the printing effect

In addition, the process box dedicated to A5 or smaller format can also be completely redesigned, and the structure of the toner box can be completely modified, such as using shorter photosensitive drums, developing rollers, charging rollers, powder feeding rollers, etc. However, this solution All parts required a complete redesign, redeveloped molds, very costly

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