Transfer Power Supply Control for Image Forming Devices
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Solution Overview
Problem
Image forming devices face issues with unallowable discharge and delayed high voltage rise during toner image transfer, leading to transfer failures, especially when the distance between the recording paper sheet and the pressing nip is reduced for compactness.
Innovation Solution
The power supply for transfer is controlled to be turned on and set to 0V before the transfer member is pressed against the image carrier, then switched to a high voltage after contact, preventing unallowable discharge and ensuring quick voltage rise for successful toner image transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the power supply for transfer is turned on and high voltage is applied before the transfer member is pressed against the image carrier, then the high voltage can be applied in advance, but unallowable discharge occurs between the transfer member and the image carrier
Solution Approach 1:
The power supply controller performs preliminary actions by turning on the power supply and applying high voltage before the transfer member contacts the image carrier. However, to prevent unallowable discharge, the controller waits until the transfer member is pressed against the image carrier before switching to the high voltage for transfer. This resolves the contradiction by performing the necessary preliminary setup while timing the high voltage application to avoid harmful discharge.
2Volume of moving object
If the distance between the recording paper sheet and the pressing nip is reduced for compactness, then the device size is reduced, but the high voltage rise becomes delayed causing transfer failures
Solution Approach 1:
The power supply controller uses feedback from the transfer member's contact state with the image carrier to determine when to switch to high voltage for transfer. By monitoring whether the transfer member has been pressed against the image carrier, the controller can reliably timing the high voltage application, ensuring successful transfer even when the recording paper sheet is positioned closer to the pressing nip for compact device design.
3Stability of the object's composition
If the transfer member is pressed against the image carrier at all times, then the transfer member remains in position, but deformation occurs due to creep deformation when not in use
Solution Approach 1:
The transfer member is designed to be dynamically controllable, able to move between contacting and retreating from the image carrier based on operational needs. The contact-retreat drive unit enables the transfer member to be pressed against the image carrier only when transfer is required, and to retreat when not in use, preventing creep deformation while maintaining position stability during operation.
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 method prevents unallowable discharge and ensures timely high voltage application, reducing the risk of transfer failures and enabling efficient toner image transfer onto the recording paper sheet.
Implementation Method 1
a rotatable transfer member which is pressed against the image carrier and to which a high voltage for transfer is applied from a power supply for transfer
Data Source
AI summary
An image forming device includes a power supply for transfer for applying a voltage for transfer for transferring the toner image on the image carrier onto the recording paper sheet to the transfer member, and a recording paper sheet feed device for feeding the recording paper sheet into the pressing nip, and the method for controlling a power supply for transfer. The power supply for transfer is turned on and the output voltage of the power supply for transfer is set to 0 V before the transfer member is pressed against the image carrier, and the output voltage of the power supply for transfer is switched from 0 V to a high voltage for transfer after the transfer member is pressed against the image carrier.