Image Forming Apparatus Manual Duplex Bias Control
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Solution Overview
Problem
Conventional image forming apparatuses lack control mechanisms for achieving excellent image formation on both faces of a sheet in manual duplex mode, particularly in terms of transferring biases, leading to suboptimal image quality on the second face.
Innovation Solution
An image forming apparatus with a condition setting section to individually set operating conditions for each image forming face and a control section to manage the image forming process based on these settings, including adjusting transferring biases for optimal toner transfer on both the first and second faces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual duplex mode is used without control mechanisms, then operation simplicity is maintained, but image formation quality on the second face deteriorates
Solution Approach 1:
The patent applies parameter changes by adjusting the transferring bias voltage based on the image formation face (first face or second face). The control section sets different transferring bias values corresponding to different faces, optimizing toner transfer efficiency for each face's specific electrical resistance characteristics without requiring complex structural modifications.
Solution Approach 2:
The control section performs preliminary action by pre-setting the transferring bias according to the selected image formation face before actual image formation begins. This ensures optimal transferring conditions are established in advance for the specific face being printed, improving image quality proactively rather than reactively.
2Manufacturing precision
If transferring bias is optimized for the second face, then image formation quality on the second face improves, but the operating condition complexity increases
Solution Approach 1:
The patent implements parameter changes by dynamically adjusting the transferring bias voltage based on the selected image formation face. The control section stores multiple transferring bias values and selects the appropriate one based on whether the first face or second face is being printed, optimizing image quality while maintaining manageable system complexity through software-based control.
3Manufacturing precision
If different transferring biases are used for first and second faces, then image formation quality on both faces improves, but control system complexity increases
Solution Approach 1:
The patent applies parameter changes by implementing a control section that manages multiple transferring bias values corresponding to different image formation faces. The system selectively applies appropriate bias values based on the printing operation requirements, achieving high image quality on both faces while keeping control system complexity manageable through organized parameter management.
Solution Approach 2:
The control section performs preliminary action by pre-configuring the appropriate transferring bias before each image formation operation on either the first or second face. This ensures optimal conditions are established in advance, improving image quality while simplifying real-time control decisions.
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 apparatus ensures excellent image formation on both faces of the recording medium by optimizing transferring biases, resulting in improved image quality and consistency in the manual duplex mode.
Implementation Method 1
the toner image is transferred from the surface of the photosensitive drum to the sheet due to the action of a transferring bias supplied to the transfer roller
Implementation Method 2
the sheet is heated and pressurized, so that the toner image is fixed to the sheet
Data Source
AI summary
Provided is an image forming apparatus including an image forming section forming images on image forming faces of a recording medium, a condition setting section individually setting an operating condition of the image forming section for forming the image on a first image forming face of a recording medium and another operating condition of the image forming section for forming the image on a second image forming face of the recording medium opposite to the first image forming face in the manual duplex mode, and a control section controlling the image forming section on the basis of each operating condition set by the condition setting section.