Grounded Destaticizing Device for Printer Sheet Separation
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Solution Overview
Problem
Existing destaticizing devices in printers face challenges in efficiently separating sheets with low firmness from the photoreceptor without causing paper jam or image quality issues, particularly when miniaturization and cost reduction are considered, as they often require additional components or voltage control systems that increase complexity and cost.
Innovation Solution
A destaticizing device comprising a grounded Detack saw and a conductive bristle brush, where the Detack saw destaticizes the sheet in a non-contact manner downstream and the brush destaticizes in a more extensive range upstream, reducing the risk of paper jam and maintaining image quality by ensuring effective electrostatic discharge without excessive force or voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single destaticizing member is used, then device complexity is reduced, but destaticizing performance becomes insufficient causing paper jam
Solution Approach 1:
The destaticizing function is divided into two segments: a first destaticizing member (brush type) and a second destaticizing member (comb type). Each member is positioned at different locations relative to the transfer area, with the first member upstream and the second member downstream. This segmentation allows each member to handle different aspects of electrostatic charge removal, ensuring comprehensive destaticizing performance while maintaining device simplicity.
2Reliability
If additional components or voltage control systems are added, then destaticizing performance is improved, but device complexity and cost increase
Solution Approach 1:
Both the first and second destaticizing members are configured to be self-grounded through their own structures. The brush type first member conducts charges to ground through its contact with the paper and structural connection to ground. The comb type second member similarly conducts charges to ground through its teeth structure and connection to ground. This self-service grounding mechanism eliminates the need for additional voltage control systems or external power supplies, reducing device complexity and cost while maintaining effective destaticizing performance.
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 separates sheets of varying firmness without paper jam, reduces the risk of image disturbance, and supports printer miniaturization and cost reduction by minimizing components and voltage requirements, while maintaining high destaticizing performance and image quality.
Implementation Method 1
a first destaticizing member that is disposed at a downstream side in a conveyance direction of a medium relatively to a transfer area where an image held in a surface of an image holder is transferred to the medium, the first destaticizing member being grounded and destaticizing the medium
Implementation Method 2
a second destaticizing member that is disposed adjacent to the first destaticizing member with respect to the conveyance direction of the medium, the second destaticizing member being grounded and destaticizing the medium
Data Source
AI summary
A destaticizing device includes: a first destaticizing member that is disposed at a downstream side in a conveyance direction of a medium relatively to a transfer area where an image held in a surface of an image holder is transferred to the medium, the first destaticizing member being grounded and destaticizing the medium; and a second destaticizing member that is disposed adjacent to the first destaticizing member with respect to the conveyance direction of the medium, the second destaticizing member being grounded and destaticizing the medium.