Development Sheet Reinforcement for Magnetic Brush Toner Scatter
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Solution Overview
Problem
Existing development devices using a flexible member to manage toner scatter in a magnetic brush configuration are prone to toner accumulation and subsequent image defects due to the flexible member being lifted by the bristling developer, leading to toner dripping on the photosensitive drum.
Innovation Solution
The development device incorporates a magnet with specific magnetic poles and a sheet configuration that includes a first scatter prevention sheet with a backup sheet or increased stiffness at the fixed end to prevent deformation, ensuring the sheet remains in contact with the developer and prevents toner scatter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a flexible member is used to abut the developer in the region where the developer bristles, then toner scatter is suppressed, but the flexible member is lifted by the bristling developer causing toner accumulation and image defects
Solution Approach 1:
The patent uses a flexible member (thin film structure) to abut the developer in the bristling region. The flexible member is designed with specific properties to maintain contact with the developing sleeve while allowing controlled deformation, preventing both excessive lift-off and toner scatter
Solution Approach 2:
The patent optimizes parameters of the flexible member including its position, contact pressure, and material properties to balance between suppressing toner scatter and preventing lift-off. By adjusting these parameters, the system achieves stable operation without toner accumulation
2Object-affected harmful factors
If the flexible member is positioned to contact the developing sleeve, then toner scatter is prevented, but the member deforms due to magnetic brush bristling causing toner dripping
Solution Approach 1:
The flexible member is designed as a thin film structure that can deform elastically to accommodate the bristling magnetic brush while maintaining continuous contact with the developing sleeve, preventing both scatter and deformation-induced dripping
Solution Approach 2:
The flexible member acts as a cushioning element that absorbs the mechanical stress from the bristling developer before it can cause lift-off or deformation. The member's flexibility provides a buffer zone that prevents direct transmission of bristling forces
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 scatter and subsequent image defects by maintaining the sheet's contact with the developer, thereby preventing toner accumulation and contamination on the photosensitive drum.
Implementation Method 1
a magnet that is fixed in a non-rotatable manner in the developing rotation member, the magnet having a first magnetic pole and a second magnetic pole
Implementation Method 2
the developer then forms a magnetic brush by raising naps in the development region
Data Source
AI summary
A development device includes a first sheet that is fixed to the cover, the first sheet being arranged to contact a magnetic brush, and a second sheet that is fixed to the cover, the second sheet being arranged to be superimposed on a first surface of the first sheet. With respect to the rotational direction of the developing rotation member, a free end of the first sheet is disposed on a downstream of a position where the regulating portion opposes the developing rotation member and on an upstream of the closest portion between the developing rotation member and the image bearing member. With respect to the rotational direction of the developing rotation member, a free end of the second sheet is disposed on the downstream of the position where the regulating portion opposes the developing rotation member and on an upstream of the free end of the first sheet.