Developing Roller Backward Rotation for Toner Adhesion Prevention
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Solution Overview
Problem
Image forming apparatuses using low-temperature fixing toners face challenges in preventing toner melting outside the fixing device, leading to defects such as contamination and transport errors due to the toner's low glass transition temperature, which causes it to soften and adhere to inappropriate surfaces.
Innovation Solution
The implementation of a temperature sensor and controller system that monitors ambient temperatures and drives the developing roller in a backward direction to break and separate the toner before it reaches its melting point, preventing it from adhering to the developing roller and layer restricting member, thereby maintaining the toner in a compressed state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If low-temperature fixing toner is used to enable low-temperature fixing, then fixing temperature is reduced and offset resistance is improved, but toner melts at low temperature causing contamination and transport errors
Solution Approach 1:
The controller performs preliminary action by detecting ambient temperature and proactively controlling the developing roller to rotate in the backward direction before the toner can melt and cause contamination. This preventive measure breaks and separates the toner particles before they reach their melting point, preventing the harmful effect from occurring in the first place
Solution Approach 2:
The system changes the operational parameters of the developing roller based on ambient temperature conditions. When the ambient temperature approaches the toner's glass transition temperature, the controller reverses the rotation direction of the developing roller, changing the physical state and behavior of the toner to prevent melting and contamination
2Stability of the object's composition
If low-temperature fixing toner is used to achieve wide non-offset region, then offset resistance is improved, but toner softens and adheres to developing roller and layer restricting member
Solution Approach 1:
Instead of allowing the toner to remain stationary and risk adhering to the developing roller and layer restricting member, the system inverts the normal operation by rotating the developing roller in the backward direction. This reverse rotation actively breaks and separates the toner particles, preventing them from softening and adhering to inappropriate surfaces while maintaining the benefits of low-temperature fixing
3Productivity
If ambient temperature increases due to continuous image formation, then fixing capability is maintained, but toner melts in places other than fixing device
Solution Approach 1:
The system implements feedback control by continuously monitoring the ambient temperature in the developing device with a temperature sensor. When the ambient temperature increases due to continuous image formation and approaches the toner's glass transition temperature, the controller receives this feedback and automatically adjusts the developing roller rotation direction to prevent toner melting and contamination
Solution Approach 2:
The controller performs preliminary protective action by detecting the rise in ambient temperature and proactively reversing the developing roller rotation before the toner can melt. This prevents the harmful effect of toner melting and contamination before it occurs, allowing continuous image formation to proceed without defects
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively prevents toner melting and adherence, reducing the risk of defects and maintaining printing capability by ensuring the toner remains in a solid state, thus preventing contamination and transport errors within the image forming apparatus.
Implementation Method 1
a temperature sensor configured to detect an ambient temperature of an atmosphere including the developing device
Implementation Method 2
the controller is configured to drive the developing roller of the developing device in a backward direction based on the ambient temperature detected by the temperature sensor and the temperature information stored in the storage medium
Data Source
AI summary
According to one embodiment, an image forming apparatus includes a developing device, a temperature sensor, and a controller. The developing device includes a developing roller configured to develop an electrostatic latent image with a toner and is supplied with the toner from at least one toner cartridge having a storage medium configured to store temperature information regarding melting of a contained toner. The temperature sensor detects the ambient temperature of the atmosphere including the developing device. The controller is configured to drive the developing roller of the developing device based on the ambient temperature detected by the temperature sensor and the temperature information stored in the storage medium.