Photosensitive Drum Deterioration Calculation Using Contact and Separation Rotation Counts
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Solution Overview
Problem
Conventional image forming apparatuses inaccurately calculate the deterioration of photosensitive drums as they do not consider the separation state between the photosensitive drum and the developing roller, leading to incomplete assessment of drum wear.
Innovation Solution
Incorporating a separation mechanism and memory systems to track and calculate the number of rotations in both contact and separation states of the photosensitive drum, allowing for accurate determination of deterioration based on distinct rotation counts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only contact state rotation time is counted to determine photosensitive drum service life, then the calculation method is simple, but the deterioration quantity calculation is inaccurate
Solution Approach 1:
The patent segments the rotation counting function into two distinct counters: a first counter for contact state rotations and a second counter for separation state rotations. This segmentation allows accurate tracking of deterioration in both operational states while maintaining clear functional separation in the control system, resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The patent introduces a state detection mechanism as an intermediary that monitors whether the developing roller is in contact or separation state with the photosensitive drum. This intermediary component enables the system to accurately distinguish and record rotations in different states without requiring complex overall system redesign, thus improving deterioration calculation accuracy while controlling complexity.
2Ease of repair
If the developing roller is made movable to separate from the photosensitive drum, then maintenance and cleaning are easier, but the photosensitive drum deteriorates due to rotation in separation state
Solution Approach 1:
The patent implements a feedback mechanism where the control unit continuously monitors the rotation count of the photosensitive drum in separation state and provides feedback regarding drum condition. This feedback system allows the system to track cumulative separation rotations and alert users when the photosensitive drum approaches the end of its service life, enabling timely maintenance while preserving the ease of repair benefits from the movable developing roller design.
Data Source
AI summary
An image forming apparatus includes: a photosensitive drum; a developing roller; a separation mechanism configured to switch a state of the photosensitive drum and the developing roller between a contact state and a separation state; a main memory storing therein a first rotation number and a second rotation number; and a controller configured to perform calculating a deterioration quantity of the photosensitive drum based on the first rotation number and the second rotation number in the main memory. A surface of the developing roller contacts a surface of the photosensitive drum in the contact state, whereas the surface of the developing roller is separated from the surface of the photosensitive drum in the separation state. The first rotation number is the number of rotations of the photosensitive drum in the contact state, and the second rotation number is the number of rotations of the photosensitive drum in the separation state.