Rotary Developing Unit Toner Guide for Uniform Distribution
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Solution Overview
Problem
Toner distribution within developing units in rotary developing systems of electrophotographic image forming apparatuses is non-uniform, leading to image defects such as concentration unevenness.
Innovation Solution
The image forming apparatus includes a rotary with developing units that have a receiving opening, an accommodating chamber, a developing roller, a supply roller, and a guide portion to uniformly distribute toner by guiding it in a direction intersecting the axial direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If toner is discharged from the toner cartridge into the developing unit through the opening portion, then the developing unit is replenished with toner, but toner remains inside the developing unit near the opening portion causing non-uniform toner distribution
Solution Approach 1:
The invention extracts the harmful accumulation of toner near the opening portion by introducing a wind blowing hole that directs airflow to remove excess toner from the vicinity of the opening, thereby eliminating the cause of non-uniform distribution while preserving the replenishment function
Solution Approach 2:
The invention uses pneumatic means by introducing a wind blowing hole and utilizing airflow to transport toner particles away from the opening portion area, achieving uniform distribution through fluid dynamics rather than mechanical means
Data Source
AI summary
An image forming apparatus including: a photosensitive drum; a rotary configured to be rotatable around an axial direction; a toner cartridge configured to be supported by the rotary and have a discharge opening discharging toner, and a developing unit configured to be supported by the rotary, develop an electrostatic latent image formed on the photosensitive drum at a development position, and have a discharged receiving opening receiving toner, an accommodating chamber accommodating the received toner, a developing roller, a supply roller rotating around a roller axis along the axial direction and supplying the housed toner to the developing roller, and a guide portion, in which the guide portion guides toner moving in a direction intersecting the axial direction away from the receiving opening, is used.