Linear Developer Collecting Duct with Flow Restriction
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Solution Overview
Problem
In electrophotographic image forming apparatuses, the accumulation and scattering of waste developer during maintenance operations lead to poor image quality due to the exposure of engaging portions of developing devices to flowing waste developer, which is not effectively prevented by existing techniques.
Innovation Solution
A linear developer collecting duct with vertically spaced coupling portions and flow path restricting portions that guide waste developer flow to prevent it from hitting lower engaging portions, ensuring that waste developer is contained and does not accumulate or scatter when developing devices are detached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple developing devices are coupled in tiers to a linear developer collecting duct, then the waste developer can be collected in a single location, but the waste developer accumulates on the engaging portions of lower developing devices and scatters when they are detached
Solution Approach 1:
The engaging portion is extracted from the waste developer flow path by providing a flow path restricting portion that prevents waste developer from reaching the engaging portion. This separation allows the engaging portion to be detached without waste developer scattering, while still maintaining waste developer collection functionality.
Solution Approach 2:
The flow path restricting portion acts as an intermediary structure between the waste developer flow and the engaging portion. It guides the waste developer flow away from the engaging portion, preventing accumulation and scattering while maintaining the tiered coupling structure's waste collection efficiency.
2Ease of operation
If the engaging portion is exposed to the inside of the developer collecting duct, then the developing device can be easily coupled and detached, but waste developer hits the engaging portion and accumulates on it
Solution Approach 1:
The engaging portion is extracted from the waste developer flow path by providing a flow path restricting portion that prevents waste developer from reaching the engaging portion. This separation allows the engaging portion to be detached without waste developer scattering, while still maintaining waste developer collection functionality.
Solution Approach 2:
The flow path restricting portion creates a localized modification in the duct structure that specifically protects the engaging portion area while maintaining waste developer collection in other areas. The restriction is applied only where needed to prevent accumulation on the engaging portion.
3Device complexity
If waste developer flows freely down the linear collecting duct, then the collection process is simple, but the waste developer scatters when developing devices are detached during maintenance
Solution Approach 1:
The engaging portion is extracted from the waste developer flow path by providing a flow path restricting portion that prevents waste developer from reaching the engaging portion. This separation allows the engaging portion to be detached without waste developer scattering, while still maintaining waste developer collection functionality.
Solution Approach 2:
The flow path restricting portion acts as an intermediary structure between the waste developer flow and the engaging portion. It guides the waste developer flow away from the engaging portion, preventing accumulation and scattering while maintaining the tiered coupling structure's waste collection efficiency.
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
Prevents the scattering of waste developer during maintenance, thereby ensuring consistent image quality by restricting the flow path and containing waste developer within the duct, even when multiple developing devices are detached from the collector.
Implementation Method 1
waste developer flowing down to hit the engaging portions
Data Source
AI summary
An image forming apparatus includes: a developer collecting duct that is linear and has a plurality of coupling portions vertically spaced apart from each other; and a plurality of developer discharging sections that each have an engaging portion inserted into one of the coupling portions to thereby be disposed as being exposed to the inside of the developer collecting duct, and that discharge waste developer to the developer collecting duct through a developer outlet provided in the engaging portion. Second and subsequent ones of the developer discharging sections from the top are detachably attached to the developer collecting duct. The developer collecting duct has a flow path restricting portion that restricts the area through which the waste developer flows down to prevent the waste developer from hitting the engaging portion of lower one of the developer discharging sections.