Timer-Based Roller Separation in Power-Save Mode
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Solution Overview
Problem
In image forming apparatuses, frequent cycles of separation and re-abutment of components like the fixing roller and pressure roller in power-save mode lead to premature failure of the separation mechanisms due to increased operational stress, affecting image quality and apparatus longevity.
Innovation Solution
Implementing a control method that reduces the frequency of separating the fixing roller and pressure roller by using a timer to determine when to enter power-save mode and maintain it, thereby minimizing the number of separation cycles and extending the life of the separation unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the fixing roller and pressure roller are frequently separated and re-abutted in power-save mode, then power consumption is reduced, but the separation mechanism fails prematurely due to increased operational stress
Solution Approach 1:
The invention changes the timing parameter of separation by introducing a predetermined time threshold. Instead of separating immediately upon entering power-save mode, the system accumulates time and only separates when the threshold is exceeded, thereby reducing the frequency of separation operations while still achieving power savings.
Solution Approach 2:
The invention performs preliminary timing accumulation before triggering the separation action. By monitoring and accumulating the time spent in power-save mode beforehand, the system determines whether separation is truly necessary, thus avoiding unnecessary separation cycles that would stress the mechanism.
2Reliability
If the transfer roller remains pressed against the photosensitive drum during power-save mode, then separation mechanism wear is reduced, but the elastic layers become deformed and image quality degrades
Solution Approach 1:
The invention changes the time parameter by introducing a predetermined time threshold for separation. This timing parameter ensures that components are separated long enough to prevent elastic layer deformation and maintain image quality, while not separating so frequently as to wear out the separation mechanism prematurely.
3Manufacturing precision
If the developing roller and photosensitive drum are separated frequently in power-save mode, then elastic layer deformation is prevented, but the separation unit experiences increased stress and reduced lifespan
Solution Approach 1:
The invention introduces and applies a predetermined time threshold parameter that balances two competing requirements: separating long enough to allow elastic layers to recover their original state (maintaining image uniformity), but not so frequently as to cause excessive wear on the separation unit.
Data Source
AI summary
An image forming apparatus which is capable of reducing the number of times a second member is separated from a first member upon entry into power-save mode, thereby minimizing failures of a separation unit. A pressure-roller separating mechanism is provided so as to abut and separate a pressure roller and a fixing roller against/from each other. The image forming apparatus is controlled to change to a power-save mode in which power consumption of the image forming apparatus is reduced. The pressure-roller separating mechanism is controlled to separate the pressure roller and the fixing roller from each other in the power-save mode based on a measurement result measured by a timer, and the power-save mode is maintained after the pressure roller and the fixing roller are separated from each other.