Image Forming Device Voltage Control for Toner Adherence
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Solution Overview
Problem
Existing image forming devices face issues with rear surface dirt due to image writing position adjustment, where toner adheres to the transferring belt and affects printing quality, and previous solutions either increase product size and cost or result in toner adherence on the photosensitive body due to friction.
Innovation Solution
An image forming method and device that includes a charging step, image writing step, developing step, transferring step, and image writing position adjusting step, with a voltage output control step to manage voltages during these processes, ensuring that at least two of charging, developing, and transferring are not implemented simultaneously to prevent toner adherence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the photosensitive body is separated from the transferring member to prevent toner adherence, then rear surface dirt is prevented, but device complexity and product size increase
Solution Approach 1:
The patent changes the electrical parameter (voltage) of the transferring member from its normal operating state to a low-voltage or reverse-polarity state during image writing position adjustment. This parameter change prevents toner adherence without requiring structural modification or separation of components, thus resolving the contradiction between preventing rear surface dirt and maintaining simple device structure
2Object-generated harmful factors
If voltage output to the transferring member is reduced to prevent toner transfer, then toner adherence on transferring member is reduced, but toner may still adhere due to friction
Solution Approach 1:
The patent applies a reverse polarity voltage to the transferring member before the image writing position adjustment process begins. This preliminary action creates an electrostatic environment that prevents toner adherence in advance, counteracting the friction-based adherence that would otherwise occur during the adjustment process
3Productivity
If image writing position adjustment is performed with all processes active, then printing speed is maintained, but toner adheres to transferring belt and degrades printing quality
Solution Approach 1:
The patent implements periodic control of the transferring member voltage, switching between normal operating voltage and low-voltage/reverse-polarity states based on the operational phase. During image writing position adjustment, the voltage is reduced or reversed; during normal printing operations, the voltage returns to normal levels. This periodic action maintains printing speed while preventing toner adherence during critical adjustment phases
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
Prevents rear surface dirt formation by controlling voltage outputs during image writing position adjustment, maintaining printing quality without increasing product size or cost, and minimizing toner adherence on the photosensitive body or transferring member.
Implementation Method 1
a charging step of charging an image carrier
Implementation Method 2
a developing step of developing a latent image area written by the image writing step on the image carrier
Implementation Method 3
a transferring step of transferring a toner image developed by the developing step to a transferring member
Data Source
AI summary
An image forming method, includes a charging step of charging an image carrier; an image writing step of writing image data onto the image carrier; a developing step of developing a latent image area written by the image writing step on the image carrier; a transferring step of transferring a toner image developed by the developing step to a transferring member; an image writing position adjusting step of detecting a position of the image carrier where the image is written in a case where designated conditions are satisfied, and of adjusting an image writing position; and a voltage output control step of controlling voltages applied for charging, developing, and transferring in the charging step, the developing step, and the transferring step, respectively.