Developer Discharge Stabilization via Pressure Adjustment Port
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Solution Overview
Problem
In image forming apparatuses using the electrophotographic method, fluctuations in the amount of developer discharged from the discharge port occur due to changes in pressure, affecting developer replenishment and replacement efficiency.
Innovation Solution
A developing apparatus with a discharge port and a pressure adjustment port, where the pressure adjustment port is positioned to stabilize the pressure fluctuations caused by the discharge paddle, ensuring consistent developer discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a trickle mechanism is adopted to discharge excess developer from the discharge port, then developer deterioration is suppressed through gradual replacement, but fluctuations in the amount of developer discharged occur due to pressure changes at the discharge port
Solution Approach 1:
A pressure adjustment port is introduced as an intermediary element to regulate the pressure within the accommodation portion. This mediator component allows controlled pressure equalization, preventing pressure fluctuations from directly affecting the discharge port and causing inconsistent developer discharge amounts while maintaining the trickle mechanism's developer replacement function
Solution Approach 2:
The pressure parameter within the accommodation portion is actively adjusted and controlled through the pressure adjustment port. By modifying and stabilizing the pressure parameter, the system eliminates pressure-induced fluctuations in discharge amount while preserving the gradual developer replacement mechanism that suppresses deterioration
Data Source
AI summary
A developing apparatus includes a developer holder that holds a developer; an accommodation portion that accommodates the developer to be supplied to the developer holder; a rotation shaft rotatably provided inside the accommodation portion; a first conveyance portion that is provided on the rotation shaft and conveys the developer in a direction intersecting an axial direction of the rotation shaft; a second conveyance portion that is provided on the rotation shaft and conveys the developer in the axial direction; a discharge port that is provided in the accommodation portion and through which a part of the developer is discharged to an outside at a position corresponding to a position where the first conveyance portion is provided in the axial direction; and a pressure adjustment port that is provided in the accommodation portion and through which a pressure of the accommodation portion is adjusted at a position in a rotation direction of the first conveyance portion with respect to the discharge port, the position corresponding to a position where the first conveyance portion is provided in the axial direction.