Developing Apparatus Protrusions Reduce Toner Coagulation
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Solution Overview
Problem
Conventional developing apparatuses fail to completely prevent fine toner particles from entering and coagulating/fusion-bonding in the bearing sections of rotary members, leading to image quality deterioration and increased maintenance needs due to frictional heat and densely arranged components.
Innovation Solution
The developing apparatus incorporates protrusions on the bearing and rotary members to reduce the sliding surface area, preventing toner particles from being ground and coagulated, and uses toners with a glass-transition temperature between 30°C and 60°C to minimize fusion-bonding, ensuring stable rotation and reduced wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional bearing sections with large sliding surfaces are used, then rotary members can rotate smoothly, but toner particles enter and coagulate/fusion-bond on the sliding surfaces, deteriorating image quality and increasing maintenance needs
Solution Approach 1:
The invention extracts and removes the harmful sliding surface from the bearing section by replacing the conventional large-area sliding contact with a point-contact structure using a ball bearing. This eliminates the surface where toner particles would otherwise coagulate and fusion-bond, while maintaining smooth rotation through the ball bearing mechanism.
Solution Approach 2:
The invention replaces the mechanical sliding contact system with a ball bearing system that uses rolling motion instead of sliding motion. This substitution eliminates the large sliding surface that causes toner particle accumulation, while providing smoother rotation with reduced friction through the rolling ball elements.
2Reliability
If sealing members or filling materials are used to prevent toner entry, then toner invasion is reduced, but device complexity increases and complete prevention becomes difficult
Solution Approach 1:
The invention extracts and eliminates the need for sealing members and filling materials by fundamentally changing the bearing structure to a ball bearing system. This point-contact design inherently prevents toner particle accumulation without requiring additional sealing components, thereby reducing device complexity while achieving complete toner prevention.
Solution Approach 2:
The invention replaces the sealing-member-based prevention system with a ball bearing system that prevents toner entry through its mechanical structure. The ball bearing's enclosed design and point-contact geometry naturally block toner particles from reaching the contact surface, eliminating the need for separate sealing components.
3Manufacturing precision
If small-diameter toners are used for high-quality image formation, then thin line reproduction improves, but toner particles are more easily ground and coagulated in bearing sections
Solution Approach 1:
The invention extracts and removes the harmful sliding surface that grounds and coagulates toner particles by implementing a ball bearing system. This eliminates the mechanical grinding action that would otherwise damage small-diameter toners, allowing high-quality thin line reproduction to be achieved without compromising toner particle integrity.
Solution Approach 2:
The invention replaces the sliding contact mechanical system with a ball bearing system that uses rolling motion. This substitution eliminates the grinding and shearing forces that damage small-diameter toners, thereby preserving toner particle integrity while enabling high-resolution image formation with thin line reproduction.
4Use of energy by stationary object
If low-temperature fixing toners are used for energy saving, then fixing temperature is reduced, but toner particles are more prone to fusion-bonding in bearing sections
Solution Approach 1:
The invention extracts and removes the sliding surface that causes frictional heating and fusion-bonding by implementing a ball bearing system. This eliminates the heat generation mechanism that would otherwise cause low-temperature fixing toners to fusion-bond in the bearing section, allowing energy-saving low-temperature fixing without compromising toner particle stability.
Solution Approach 2:
The invention replaces the sliding contact system with a ball bearing system that uses rolling motion. This substitution dramatically reduces frictional heat generation, preventing the thermal conditions that cause fusion-bonding of low-temperature fixing toners, thereby enabling energy-saving operation while maintaining toner particle stability.
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 design effectively prevents toner coagulation and fusion-bonding, maintains image quality, and reduces maintenance by minimizing toner particle interaction with sliding surfaces, while allowing for energy-efficient low-temperature fixing.
Implementation Method 1
preventing toner particles from being ground and coagulated, and uses toners with a glass-transition temperature between 30°C and 60°C to minimize fusion-bonding
Implementation Method 2
toners with a glass-transition temperature between 30°C and 60°C to minimize fusion-bonding
Data Source
AI summary
A developing apparatus includes a developer container for storing a developer which contains toner, a rotary member for stirring and conveying the developer, and a bearing member to hold the rotary member in the developer container. At least one of the bearing member and the rotary member has a plurality of protrusions on a portion of the bearing member which holds the rotary member, or on a portion of the rotary member which is held by the bearing member.