Process Cartridge Seal Member Work Function for Drive Torque Reduction
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Solution Overview
Problem
In image forming apparatuses, the increased speed and reduced size of electrophotographic photosensitive drums lead to higher drive torque requirements due to increased friction between the cleaning blade and the drum, resulting in higher power consumption and reduced energy efficiency.
Innovation Solution
A process cartridge with a cleaning member and a seal member that uses a toner with an organosilicon polymer forming protrusions, where the seal member has a work function that either exceeds or is close to the toner's work function, reducing electrostatic adhesion and improving flowability, thereby reducing the drive torque by minimizing contact area between the cleaning blade and the drum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cleaning blade slides against the photosensitive drum surface at high speed, then the cleaning effectiveness is improved, but the temperature of the cleaning blade rises and the contact surface increases, leading to increased frictional force and drive torque
Solution Approach 1:
The seal member acts as an intermediary between the cleaning blade and the photosensitive drum. It modifies the interaction by providing a controlled contact interface that reduces direct friction while maintaining cleaning effectiveness. The seal member's material properties and positioning create a mediator layer that allows the cleaning blade to operate at high speed without excessive temperature rise or frictional force.
Solution Approach 2:
The invention changes the physical parameters of the contact interface by introducing the seal member with specific material properties (work function greater than toner work function). This parameter change reduces electrostatic adhesion and modifies the friction characteristics, allowing the cleaning blade to slide at high speed with reduced drive torque requirements.
2Ease of operation
If the seal member has a work function greater than the toner work function, then electrostatic adhesion is reduced and toner flowability is improved, but the control over toner movement becomes more challenging
Solution Approach 1:
The seal member's work function is specifically designed to be greater than the toner's work function, creating a parameter change that reduces electrostatic adhesion. This parameter selection improves toner flowability while the downstream positioning of the seal member provides an additional control mechanism to manage toner movement.
Solution Approach 2:
The cleaning assembly is segmented into functionally distinct regions: the seal member positioned downstream to control toner movement and prevent accumulation, and the cleaning blade positioned to effectively remove toner. This segmentation allows each component to optimize its specific function without interfering with the other.
3Volume of moving object
If the photosensitive drum size is reduced, then the apparatus size is decreased, but the drive torque increases due to higher friction between the cleaning blade and drum surface
Solution Approach 1:
The seal member serves as a mediator in the reduced-size apparatus, creating an optimized contact interface between the cleaning blade and photosensitive drum. This intermediary layer reduces direct friction and allows the compact drum design to operate with acceptable drive torque levels despite the smaller size and higher rotational speed.
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 reduces drive torque, enhancing energy efficiency and maintaining toner flowability, allowing for smoother operation and reduced power consumption in image forming apparatuses.
Implementation Method 1
the work function of the seal member is greater than the work function of the developer when the developer has a negative charging polarity
Data Source
AI summary
A process cartridge includes a seal member contacting an image bearing member upstream in the rotation direction of the image bearing member from a cleaning member and allowing the developer to move from upstream in the rotation direction from the contact part between the seal member and the image bearing to downstream from the contact part while regulating movement from downstream to upstream from the contact part. The developer has surface protrusions containing an organic silicon polymer, wherein either (i) the work function of the seal member is greater than the work function of the developer when the developer has a negative charging polarity and is smaller than the work function of the developer when the developer has a positive charging polarity, or (ii) the absolute value of the difference between the work function of the seal member and the work function of the developer is within a predetermined range.