Developing Unit Separation Mechanism for Image Quality Stability
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Solution Overview
Problem
Existing image forming apparatuses require complex and time-consuming processes to separate the developing unit from the photosensitive drum, which can lead to variations in the distance between the developing roller and the photosensitive drum, affecting image quality due to torque variations from toner agitation and toner level changes.
Innovation Solution
The apparatus includes a developing unit mounted on a first movable unit that can move between close and distant positions from the photosensitive drum, and a second movable unit carrying the toner container that drags the first unit to the distant position, with a clearance formed between the units to prevent physical contact and maintain a constant distance, utilizing an interconnecting mechanism to facilitate this movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a separating mechanism is used to completely separate the developing roller from the photosensitive drum, then the developing unit can be pulled out of the apparatus body, but the process becomes complex and time-consuming
Solution Approach 1:
The patent extracts the toner container from the developing unit, allowing the developing roller to be pulled out independently without the complex separating mechanism. The toner container is separated and remains in the apparatus body, while the developing unit can be removed easily.
Solution Approach 2:
The patent segments the developing unit into two independent parts: the developing roller assembly and the toner container. This segmentation allows the developing roller to be moved independently without the toner container, simplifying the removal process and eliminating the need for complex separating mechanisms.
2Ease of operation
If the developing roller is completely separated from the photosensitive drum, then the developing unit can be removed, but variations in distance occur affecting image quality
Solution Approach 1:
The patent employs a movable support structure with urging members (springs) that dynamically maintain the developing roller in contact with or close to the photosensitive drum during operation, while allowing easy removal when the urging members are released. This dynamic mechanism ensures distance consistency during imaging while enabling easy removal.
Solution Approach 2:
The urging members automatically maintain the developing roller's position relative to the photosensitive drum without external intervention. The spring-loaded mechanism self-adjusts to maintain consistent distance during operation, eliminating the need for complex positioning systems.
3Manufacturing precision
If the developing roller is held close to the photosensitive drum by an urging device, then image quality is maintained, but the developing unit cannot be easily removed
Solution Approach 1:
The patent extracts the toner container from the developing unit and allows the developing roller to be independently removed by simply releasing the urging members. The developing roller can be taken out without the toner container, making removal easy while maintaining positioning precision during operation.
Solution Approach 2:
The patent introduces a movable support structure as an intermediary between the developing roller and the apparatus body. This intermediary carries the developing roller and can be easily moved in and out by releasing the urging members, facilitating easy removal while maintaining precise positioning during operation.
4Productivity
If the toner container is moved to drag the first movable unit, then separation time is reduced, but physical contact between units may occur
Solution Approach 1:
The patent extracts the toner container from the developing unit and positions it on a separate movable support. The toner container can be moved independently to drag the first movable unit, accelerating the separation process. The separate positioning prevents physical contact between the toner container and developing roller during movement.
Solution Approach 2:
The patent introduces a second movable support as an intermediary that carries the toner container. This intermediary can move independently and drag the first movable unit during separation. The clearance between the two movable supports prevents physical contact while enabling the dragging action to accelerate separation.
Data Source
AI summary
A copier includes a developing unit, a toner container, a first movable unit, and a second movable unit. The first movable unit carries the developing unit and is movable between a close position where a developing roller of the developing unit is located close to a photosensitive drum and a distant position where the developing roller is located away from the photosensitive drum. The second movable unit carries the toner container and is configured to drag the first movable unit from the close position to the distant position. The copier is configured so that while the second movable unit is located at a standby position for the drag, a clearance is formed between the first and second movable units to avoid physical contact between the first and second movable units.