Shutter Vibration Mechanism for Sensor Toner Adhesion
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Solution Overview
Problem
In image forming apparatuses, the detection accuracy of sensors is compromised by flapping of intermediate transfer members, leading to toner adhesion on sensor surfaces, which affects color-registration and density correction.
Innovation Solution
A movable shutter member with a vibration mechanism is introduced between the sensor and the image bearing member, which can be opened or closed based on image formation history information to prevent toner adhesion by applying vibrations to shake off adhered toner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a roller is arranged at a position opposing the sensor on the intermediate transfer member to restrain flapping, then detection accuracy is improved, but toner may fly around and adhere to the sensor surface
Solution Approach 1:
A shutter member is introduced as an intermediary protective element positioned between the sensor and the intermediate transfer member. This shutter member can be moved to a closed position to block the sensor from direct exposure to toner particles that may fly around during the restraining of intermediate transfer member flapping, thus protecting the sensor while maintaining detection accuracy
Solution Approach 2:
The shutter member is designed to be movable between an opened position (allowing normal detection) and a closed position (protecting the sensor). This dynamic adjustment allows the system to adapt to different operational states, closing the shutter when toner fly-around risk is high and opening it when accurate detection is needed
2Object-affected harmful factors
If the shutter member is kept closed to prevent toner adhesion, then sensor protection is improved, but detection of reference images cannot be performed
Solution Approach 1:
The shutter member is opened periodically at specific timings to allow the sensor to detect reference images formed on the intermediate transfer member. This periodic opening ensures that detection functions are maintained while the shutter remains closed most of the time to protect against toner adhesion during normal operation
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
The solution effectively prevents toner adhesion on sensor surfaces, maintaining accurate detection and correction of color-registration and density, thereby improving the overall image forming process.
Implementation Method 1
a vibration mechanism configured to apply vibrations to the shutter member
Data Source
AI summary
An image forming apparatus including a movable image bearing member, a sensor arranged so as to oppose the image bearing member, a shutter member movable between an opened position and a closed position, a vibration mechanism configured to apply vibration to the shutter member, and an executing portion configured to execute a vibrating action which applies vibrations to the shutter member by the vibration device based on image formation history information.