Transfer Device Inclined Surface Timing Control
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Solution Overview
Problem
The existing transfer devices in image forming apparatuses often experience transfer defects such as smear due to electrostatic sticking of the recording medium to the inclined surface of the transfer cylinder, especially when the transfer voltage is applied before the tip end of the inclined surface reaches the transfer position.
Innovation Solution
A transfer device is designed where the application of the transfer voltage to the transfer member is started only after the tip end of the inclined surface of the sheet member arrives at the transfer position, ensuring that the recording medium is properly positioned and aligned before the transfer process begins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transfer voltage is applied before the tip end of the inclined surface arrives at the transfer position, then the transfer process can be started earlier, but the recording medium electrostatically sticks to the inclined surface causing transfer defects
Solution Approach 1:
The transfer voltage is applied in advance during a predetermined period before the tip end of the inclined surface arrives at the transfer position, preparing the transfer member electrically before the actual transfer occurs, thereby enabling immediate effective transfer when the recording medium arrives without electrostatic sticking
Solution Approach 2:
The transfer voltage application timing is made dynamic and adjustable based on the position of the inclined surface, allowing optimization of the start timing to prevent electrostatic sticking while maintaining high transfer efficiency
2Productivity
If the transfer voltage is applied early to prepare the transfer member, then transfer efficiency improves, but the recording medium floats behind the inclined surface causing smear defects
Solution Approach 1:
The transfer voltage is applied during a predetermined period before the tip end of the inclined surface arrives at the transfer position, preparing the transfer member electrically in advance to ensure immediate effective transfer when the recording medium arrives, preventing both electrostatic sticking and floating
Solution Approach 2:
The voltage application timing is optimized as a controllable parameter, applying the transfer voltage during a specific time window before the inclined surface arrival to achieve the optimal balance between transfer efficiency and image quality
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 approach effectively reduces transfer defects by preventing electrostatic sticking and ensuring that the recording medium is conveyed smoothly, resulting in improved image quality and reduced smear occurrences.
Implementation Method 1
a transfer member to which a transfer voltage is applied and that transfers a developer image to the recording medium held and conveyed by the holding member
Implementation Method 2
the transfer voltage sometimes causes the recording medium to electrostatically stick to the inclined surface
Data Source
AI summary
A transfer device includes: a transfer cylinder that is rotated, and that includes a cylinder main body having an outer circumferential surface provided with a recess for housing a holding member holding a leading end of a recording medium to convey the recording medium, and a sheet member that is wound around the outer circumferential surface, both ends of which are attached to circumferential ends of the recess, respectively, and that has an inclined surface on a downstream end in a conveying direction of the recording medium; and a transfer member to which a transfer voltage is applied and that transfers a developer image to the recording medium held and conveyed by the holding member, at a transfer position, wherein application of the transfer voltage to the transfer member is started after a tip end of the inclined surface arrives at the transfer position.