Image Forming Unit Guide Member Toner Containment
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Solution Overview
Problem
Existing image forming units face issues with floating toner escaping and contaminating the apparatus, leading to toner intrusion during operation and maintenance.
Innovation Solution
An image forming unit design that includes a development housing with an agitation path and feed path for the developer, a guide member with an inner surface to direct air currents away from the developer carrier, and an outer surface to guide recording media, which captures dust and prevents toner from escaping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional image forming unit structure is used, then the device is simple and easy to manufacture, but floating toner escapes and contaminates the apparatus
Solution Approach 1:
The image forming unit is divided into distinct functional regions: a development region with the developer carrier, a separation region with the guide member, and a transfer region. The guide member creates a separated flow path that isolates the developer region from the transfer region, preventing toner escape while maintaining structural organization
Solution Approach 2:
The guide member acts as an intermediary element between the developer carrier and the image carrier. It mediates the air flow generated by the rotating developer carrier, directing it away from the image carrier while still allowing necessary developer supply. This intermediary structure prevents direct contact between floating toner and the image carrier or surrounding apparatus
2Productivity
If the developer carrier rotates to supply developer, then developer is fed effectively to the image carrier, but floating toner is generated and escapes
Solution Approach 1:
The air flow generated by the rotating developer carrier, which initially causes toner to escape, is converted into a beneficial force by the guide member. The guide member captures this air current and redirects it through a defined flow path, causing dust and floating toner to be deposited on the guide member's inner surface rather than escaping into the apparatus
Solution Approach 2:
The invention utilizes the pneumatic flow generated by the rotating developer carrier to transport developer material. The guide member shapes this air flow into a controlled path that delivers developer to the image carrier while containing floating toner within the flow path where it can be deposited and removed
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
Effectively keeps floating toner within the unit, preventing contamination of the apparatus and ensuring cleaner operation and maintenance by directing air currents and toner away from sensitive areas.
Implementation Method 1
a flow path that guides a current of air produced with rotation of the developer carrier in a direction away from the developer carrier
Implementation Method 2
Dust contained in the current of air is deposited on the inner surface of the guide member
Data Source
AI summary
An image forming unit includes an image carrier, a developer carrier, a development housing, and a guide member. The image carrier forms an electrostatic latent image. The developer carrier is in contact with the image carrier while rotating about a rotation axis and facing the image carrier to develop the electrostatic latent image. The development housing accommodates a developer and rotatably supports the developer carrier at one end with an opening portion that is open to the image carrier. The development housing includes an agitation path in which the developer is agitated and a feed path through which the developer is fed to the developer carrier. The guide member is disposed below the opening portion and includes an inner surface opposing the development housing to form a flow path that guides a current of air produced with rotation of the developer carrier in a direction away from the developer carrier, and to guide a recording medium to the image carrier with an outer surface opposite to the inner surface. Dust contained in the current of air is deposited on the inner surface of the guide member.