Sealing Member for Toner Cloud Control in Image Forming Unit
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Solution Overview
Problem
Existing image forming apparatuses face challenges in preventing toner clouds from dispersing into the transport path between the guiding member and the developing device, leading to inefficiencies in image formation and potential contamination.
Innovation Solution
An image forming unit is designed with a developing device featuring a first ventilation hole and a guiding member with a second ventilation hole, along with a sealing member positioned between them, which guides airflow and prevents toner clouds from dispersing by interrupting airflow and redirecting toner clouds back into the developing device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a flow path is formed between the guiding member and developing device to guide toner cloud, then toner cloud can be directed away from transport path, but toner cloud may still disperse into surrounding areas
Solution Approach 1:
The ventilation system is divided into multiple segments: first ventilation holes in the developing device, second ventilation holes in the guiding member, and a sealing member with multiple sealing surfaces. This segmentation allows controlled airflow through specific paths while preventing toner cloud dispersion into unwanted areas.
Solution Approach 2:
A sealing member is introduced as an intermediary element between the first and second ventilation holes. This sealing member includes a sealing surface that contacts the developing device and another sealing surface that contacts the guiding member, creating a controlled intermediate zone that directs airflow and prevents toner cloud escape.
2Productivity
If ventilation holes are provided in developing device and guiding member, then airflow can be generated and controlled, but toner cloud may escape through the ventilation paths
Solution Approach 1:
Different regions of the sealing member have different qualities: a first sealing surface that contacts the developing device to prevent toner escape, a second sealing surface that contacts the guiding member to seal the airflow path, and a specific sealing region positioned between the ventilation holes. Each region is optimized for its specific function in controlling airflow and preventing toner leakage.
3Object-affected harmful factors
If airflow path is formed to guide toner cloud, then toner can be redirected, but the structure becomes more complex with multiple components
Solution Approach 1:
The sealing member serves multiple functions simultaneously: it seals the gap between the developing device and guiding member, directs airflow through the ventilation holes, prevents toner cloud dispersion, and maintains the negative pressure field. This multi-functionality reduces the need for separate components for each function.
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
The solution effectively suppresses toner cloud dispersion, maintaining a clean transport path and improving image formation efficiency by ensuring toner clouds are recirculated and do not contaminate other areas.
Implementation Method 1
a first ventilation hole that serves as a flow path for an airflow that is generated by rotation of the image carrier
Data Source
AI summary
An image forming unit includes a developing device, a guiding member, and a sealing member. The developing device develops an electrostatic latent image formed on an image carrier that rotates. The developing device has a first ventilation hole that serves as a flow path for an airflow that is generated by rotation of the image carrier. The guiding member guides a recording material to the image carrier. The guiding member has a second ventilation hole that forms the flow path for the airflow in cooperation with the first ventilation hole. The sealing member is disposed between the first ventilation hole and the second ventilation hole. The sealing member has a first end in contact with the developing device and a second end in contact with the guiding member.