Image Forming Apparatus Dust Interception Guide
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Solution Overview
Problem
In electrophotographic image forming apparatuses, particularly those using the cleaner-less method, there is a challenge in preventing foreign substances like dust from adhering to the photosensitive drum, which can lead to toner adhesion and reduce the drum's lifespan, especially in environments with high air dust levels and strong air flow.
Innovation Solution
The image forming apparatus incorporates a two-sided printing guide with receiving ribs and a transfer guide featuring a transfer receiving member and upper wall, which create a path for foreign substances to be caught and stored, preventing them from reaching the photosensitive drum. This design includes a two-sided printing guide with inclined and projecting ribs to intercept dust and a transfer guide with a concave portion to capture any falling particles, ensuring they do not adhere to the drum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a cleaner-less method is used to collect transfer residual toner, then the device complexity is reduced, but foreign substances can adhere to the photosensitive drum
Solution Approach 1:
The patent applies preliminary action by providing a protective structure (opening with protective member) that prevents foreign substances from entering the apparatus main body before they can reach the photosensitive drum. This preventive measure is implemented in advance, eliminating the need for complex cleaning mechanisms while maintaining drum cleanliness.
2Temperature
If openings are provided for heat discharge, then heat dissipation is improved, but foreign substances can enter from the openings
Solution Approach 1:
The patent uses a protective member as an intermediary element positioned at the opening. This mediator allows heat to be discharged from the fixing unit while simultaneously blocking foreign substances from entering through the same opening, thus resolving the contradiction between heat dissipation and contamination prevention.
3Device complexity
If no cleaning unit is provided, then the device complexity is reduced, but the photosensitive drum is more susceptible to foreign substance adhesion
Solution Approach 1:
The patent implements preliminary anti-action by providing a protective structure that prevents foreign substances from reaching the photosensitive drum in the first place. This preventive approach counteracts the potential harm before it can occur, maintaining drum reliability without requiring a cleaning unit that would increase device complexity.
Data Source
AI summary
An image forming apparatus includes (i) an apparatus main body including a discharge portion and a wall disposed on an opposite side to the discharge portion with respect to a horizontal direction, the discharge portion including a first opening, and the wall including a second opening, (ii) a photosensitive drum disposed below the first opening and the second opening, (iii) an exposed surface exposed toward a first communication path communicating with the first opening and the second opening and disposed below the first communication path. The image forming apparatus includes a receiving surface projecting from the exposed surface toward the first communication path. The receiving surface is upwardly oriented with respect to the vertical direction and faces the first communication path. The receiving surface is inclined relative to the vertical direction and the horizontal direction.