Sheet Guiding Device Resistance Segmentation Transfer Errors
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Solution Overview
Problem
The use of resin-coated aluminum sheets and black paper in image forming applications leads to sudden changes in current flow when separated from grounded guiding members, causing transfer errors due to inadequate electrical control.
Innovation Solution
A sheet guiding device with a first guiding unit that is grounded and a second guiding unit with higher resistance, positioned downstream, to gradually change the overall resistance and prevent sudden current fluctuations by pinching the sheet between the image carrier and transfer unit, applying an electric field and using a dimensionally decreasing guiding plate surface in contact with the sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a grounded guiding member with low resistance is used to guide the sheet, then the sheet can be reliably guided without electrostatic adhesion, but sudden current changes occur when the sheet separates from the guiding member, causing transfer errors
Solution Approach 1:
The guiding member is divided into multiple sections along the sheet transport direction: a first guiding section with low resistance for reliable guidance, and a second guiding section with high resistance positioned downstream to control current during separation. This segmentation allows each section to perform its specific function without interfering with the other.
Solution Approach 2:
Different sections of the guiding member have different electrical resistance properties tailored to their specific functions. The upstream section has low resistance to prevent electrostatic adhesion, while the downstream section has high resistance to control current flow during separation. This local differentiation resolves the contradiction between reliable guidance and transfer precision.
2Manufacturing precision
If a high resistance resin material is used as the guiding member to avoid adverse effects on toner transfer, then transfer quality is maintained, but the sheet may electrostatically adhere to the guiding member causing transport errors
Solution Approach 1:
The guiding member is segmented into a first section made of conductive material for reliable sheet transport, and a second section made of high resistance resin material for quality transfer. This segmentation allows the system to benefit from both material properties in their respective zones.
Solution Approach 2:
The guiding member uses a composite structure combining conductive material and high resistance resin material in different sections. This composite approach allows the system to achieve both reliable transport (via conductive section) and high quality transfer (via resin section).
3Manufacturing precision
If the sheet width in contact with the guiding member is maintained constant, then guidance is simple, but sudden current changes occur during separation. If the contact width is decreased downstream, then current changes are suppressed, but the guiding structure becomes more complex
Solution Approach 1:
The guiding member's contact surface width varies locally along the transport direction: wider upstream for stable guidance, and narrower downstream to suppress sudden current changes during separation. This local geometric differentiation achieves current control without requiring complex additional components.
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
This configuration reduces sudden changes in overall resistance, minimizing transfer errors and ensuring consistent image density by maintaining current flow stability during sheet transport.
Implementation Method 1
a first guiding unit that is grounded and guides a sheet transported; and a second guiding unit that is disposed on a downstream side of the first guiding unit and grounded with a resistance higher than a resistance with which the first guiding unit is grounded
Implementation Method 2
a transfer position interposed between an image carrier that carries a toner image and a transfer unit that transfers the toner image on the image carrier onto the transported sheet by pinching the sheet between the image carrier and the transfer unit and applying an electric field across the image carrier and the transfer unit
Data Source
AI summary
A sheet guiding device includes: a first guiding unit that is grounded and guides a sheet transported; and a second guiding unit that is disposed on a downstream side of the first guiding unit and grounded with a resistance higher than a resistance with which the first guiding unit is grounded, and that guides the sheet transported to the first guiding unit to a transfer position interposed between an image carrier that carries a toner image and a transfer unit that transfers the toner image on the image carrier onto the transported sheet by pinching the sheet between the image carrier and the transfer unit and applying an electric field across the image carrier and the transfer unit. The first guiding unit has a dimension decrease area in which on a surface, in contact with the sheet, of the first guiding plate on the downstream side in the sheet transport direction, a dimensional value of a portion including a first material that is a same as the first material used as a material of another surface, in contact with the sheet, of the first guiding plate on an upstream side of the downstream side in a sheet width direction crossing the sheet transport direction is decreased at a more downstream position in the sheet transport direction.