Developer Cartridge Metallic Blade Heat Dissipation
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Solution Overview
Problem
In image forming apparatuses, developer leakage occurs due to frictional heat causing the developer to melt and stick to sealing members, leading to a deterioration in the close contact condition between the developing roller and the felt member, resulting in image disarrangement and leakage.
Innovation Solution
The introduction of a heat-release member with good heat conductance, such as a metallic plate, that extends from the sliding portion to release frictional heat generated during the image-forming operation, combined with a developer-carrying-amount control member to adjust the developer load and maintain a close contact condition, and an auxiliary sealing member to further prevent leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the felt member frictionally slides on the developing roller to prevent developer leakage, then developer leakage is restrained, but frictional heat causes the developer to melt and stick to the felt member, deteriorating the close contact condition
Solution Approach 1:
A heat-release member (metallic plate) is introduced as an intermediary between the felt member and the developing roller. This metallic plate has high thermal conductivity and serves as a heat dissipation path, conducting away the frictional heat generated during sliding contact while allowing the felt member to maintain its sealing function. The heat-release member acts as a thermal mediator that protects the felt member from overheating.
Solution Approach 2:
The thermal conductivity parameter of the sliding portion is changed by introducing a metallic plate with high thermal conductivity. This parameter change enables efficient heat dissipation from the friction interface, maintaining the temperature of the felt member within a range that prevents developer melting while preserving the close contact condition necessary for leakage prevention.
2Reliability
If the felt member maintains close contact with the developing roller to prevent developer leakage, then sealing performance is improved, but frictional heat accumulation causes developer to melt and cake onto the felt member
Solution Approach 1:
The frictional heat, which is initially a harmful factor causing developer melting, is converted into a beneficial situation by introducing the heat-release member. The metallic plate captures and conducts away the frictional heat, transforming the heat generation issue into an efficient heat dissipation system. This allows the felt member to maintain close contact for sealing while the heat is actively managed and removed.
3Reliability
If the sliding portion operates continuously to maintain developer containment, then developer leakage is prevented, but heat accumulation from continuous friction causes deterioration in close contact condition
Solution Approach 1:
The heat-release member creates a self-service heat dissipation system where the frictional heat generated during operation automatically conducts through the metallic plate to the surrounding environment. This passive heat management system operates continuously without external intervention, allowing the felt member to maintain its sealing function over extended operational periods without heat accumulation causing deterioration.
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 effectively prevents developer leakage by maintaining a stable temperature at the sliding portion, ensuring a consistent close contact between the developing roller and sealing member, thereby preventing image disarrangement and maintaining the integrity of the image forming process.
Implementation Method 1
a heat-release member with good heat conductance, such as a metallic plate, that extends from the sliding portion to release frictional heat generated during the image-forming operation
Implementation Method 2
the felt member frictionally slides on the circumferential surface at both end portions of the developing roller during the image forming operation. In this case, the sliding portion between the circumferential surface and the felt member restrains the leak of the developer
Data Source
AI summary
A developer cartridge includes a developer cartridge case for accommodating a developer, a developing roller, a toner layer thickness control blade, and a side sealing member. The developing roller is supported by the developer cartridge case such that a circumferential surface thereof is exposed to an outside of the developer cartridge case along a width direction. The toner layer thickness control blade includes a blade body portion made of a metallic plate. A tip portion of the blade body portion is disposed at a sliding portion of the developing roller and the side sealing member so as to contact with the side sealing member. A frictional heat generated at the sliding portion is released to the outside of the developer cartridge case through the blade body portion in order restrain a leak of the developer as much as possible.