Developing Device Leakage Suppression for Toner Cloud Control
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Solution Overview
Problem
The pressure difference between the inside and outside of a developing device in an image forming apparatus causes air currents that can lead to toner particles floating in the air to leak out, potentially disturbing the image forming process and staining components.
Innovation Solution
A developing device with a rotatable developing member that forms a developer layer on an image carrying member, featuring a housing with an open part and a leakage suppressing member at the edge to prevent developer leakage, and a collecting mechanism that includes a filter to catch toner clouds and guide air currents away from the image carrying member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If air flows into the developing device with rotation of developing member and image carrying member, then the pressure in the developing device rises, but air current flows toward the outside and sends toner cloud to the outside of the developing device
Solution Approach 1:
The patent extracts and removes the harmful air current and toner cloud from the system by providing a discharge opening that directs them away from the image carrying member. The leakage suppressing member isolates the toner cloud generation area, allowing the harmful elements to be extracted and discharged safely without affecting image formation.
Solution Approach 2:
The patent introduces a leakage suppressing member as an intermediary element between the developing device interior and the image carrying member. This intermediary component blocks the direct path of toner cloud while allowing controlled discharge through the opening, mediating between the high-pressure interior and the exterior environment.
2Object-generated harmful factors
If leakage suppressing member is provided at the edge of the open part, then developer leakage is suppressed, but device complexity increases
Solution Approach 1:
The leakage suppressing member is implemented as a flexible sealing structure that conforms to the housing edge and open part geometry. This thin-film-like component provides effective sealing against developer leakage while adding minimal structural complexity compared to rigid sealing mechanisms.
Solution Approach 2:
The leakage suppressing member is positioned asymmetrically at the edge of the open part on the downstream side, specifically targeted at the location where toner cloud leakage occurs. This asymmetric placement provides maximum leakage suppression effectiveness while minimizing the amount of additional structure required.
Data Source
AI summary
A developing device includes a developing member that develops an electrostatic latent image on an image carrying member with developer; a housing that houses and supports the developing member and has an open part facing the image carrying member; a storage portion provided inside the housing and storing the developer; and a leakage suppressing member provided at an edge of the open part that is on a downstream side in a direction of rotation of the developing member, the leakage suppressing member suppressing leakage of the developer from the housing toward the image carrying member. The housing has an opening on the downstream side in the direction of rotation with respect to the leakage suppressing member and on an upstream side in the direction of rotation with respect to the storage portion, the opening being open from a side of the developing member toward the outside of the housing.