Image-Forming Apparatus with Staged Lubricant Addition
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Solution Overview
Problem
The frictional force between the photosensitive member and the cleaning member increases due to improved wear resistance, leading to increased torque and potential contamination of the charging roller, and fusion of lubricant particles on the developing blade causes image defects and hinders the lifetime extension of the developing device and process cartridge.
Innovation Solution
An image forming apparatus with a detachable supply container that accommodates an initial developer with predetermined toner particles and oppositely charged lubricant particles, where the lubricant particles are added in a smaller amount compared to the initial developer, ensuring controlled friction and reducing fusion on the developing blade.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the wear resistance of the photosensitive member surface is improved, then the scratch resistance and durability are enhanced, but the frictional force between the photosensitive member and cleaning member increases
Solution Approach 1:
The patent changes the chemical composition parameters of the surface layer by incorporating specific wear-resistant materials and lubricating agents in controlled amounts. This modifies the surface properties to achieve both high wear resistance and controlled friction, resolving the contradiction between durability and friction force.
Solution Approach 2:
The surface layer is constructed as a composite material combining wear-resistant substances (such as inorganic particles or cross-linked polymers) with lubricating components. This composite structure provides both the required durability and the necessary friction control, simultaneously addressing both opposing requirements.
2Duration of action of stationary object
If the frictional force increases due to improved wear resistance, then the durability is enhanced, but the torque required for rotation increases and contamination of the charging roller occurs
Solution Approach 1:
The patent optimizes the friction coefficient parameter of the photosensitive member surface by controlling the content and type of lubricating agents in the surface layer. This parameter adjustment reduces the torque requirement while preserving the durability benefits of the wear-resistant surface.
Solution Approach 2:
The patent converts the potential harm of high friction into a benefit by using the friction-generated heat and contact pressure to activate lubricating agents embedded in the surface layer. This transforms the harmful high-friction condition into a mechanism that releases lubrication, thereby reducing torque while maintaining durability.
3Power
If lubricant particles are added to reduce friction, then the torque is reduced, but the lubricant particles fuse on the developing blade causing image defects
Solution Approach 1:
The patent precisely controls the particle size, surface charge, and chemical composition parameters of the lubricant particles. These parameter adjustments prevent particle fusion on the developing blade while maintaining their friction-reducing function, thus preserving image quality.
Solution Approach 2:
The patent creates local quality differences by providing lubricant particles with specific properties in different regions or at different concentrations. The lubricant particles are designed to remain stable in the developing blade region (preventing fusion) while effectively reducing friction in the contact region between the photosensitive member and cleaning member.
4Stability of the object's composition
If the same amount of lubricant particles is added to the supply developer as to the initial developer, then the friction control is consistent, but the lubricant particles fuse on the developing blade causing image defects
Solution Approach 1:
The patent changes the concentration parameter of lubricant particles between the initial developer and supply developer. By reducing the lubricant content in the supply developer while maintaining other composition parameters, the patent prevents particle fusion during prolonged operation while preserving the friction control established by the initial developer.
Solution Approach 2:
The patent uses the initial developer with higher lubricant content to establish optimal friction conditions during the critical initial operation phase. The supply developer then maintains these conditions with reduced lubricant content, preventing the fusion problems that would occur with continued high lubricant levels. This preliminary action of establishing friction control resolves the contradiction between consistency and image quality.
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 configuration suppresses image failures by maintaining optimal frictional forces and preventing lubricant fusion, thereby extending the lifetime of the developing device and process cartridge.
Implementation Method 1
a surface of a photosensitive member is electrically charged uniformly by a charging device
Implementation Method 2
the initial developer contains toner particles of which charge polarity is a predetermined polarity, and to the toner particles of the initial developer, lubricant particles of a polarity opposite in charge polarity to the predetermined polarity are externally added
Data Source
AI summary
An image forming apparatus includes a rotatable image bearing member, a charging member, a developing unit, a cleaning member, and a supply container. In an accommodating portion of a new developing unit, an initial developer which is a developer in a predetermined amount is filled in advance. The initial developer contains toner particles of which charge polarity is a predetermined polarity, and to the toner particles of the initial developer, lubricant particles of a polarity opposite in charge polarity to the predetermined polarity are externally added. A supply developer which is the developer accommodated in the supply container contains the toner particles. An external addition amount of the lubricant particles to the toner particles in the supply developer is smaller than an external addition amount of the lubricant particles to the toner particles in the initial developer.