Grounded Transfer Rolls for Intermediate Imaging
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Solution Overview
Problem
Electrophotographic imaging devices require complex power supplies and extensive cabling to facilitate electrostatic transfer of images from photoconductive drums to intermediate transfer members, increasing costs and complexity.
Innovation Solution
The implementation of electrically grounded transfer rolls, which are laterally offset from the photoconductive drums and connected to the device frame, allowing for electrostatic transfer without the need for additional power sources or cabling, using an intermediate transfer member with low surface and volume resistivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrically biased backup rolls are used to create a nip with photoconductive drums for electrostatic transfer, then image transfer efficiency is improved, but device complexity and cost increase due to required power supply and cabling
Solution Approach 1:
The patent extracts the electrical biasing function from the backup rolls by removing the power supply and cabling components. Instead of actively biasing the backup rolls electrically, the system uses the natural electrostatic properties of the photoconductive drum and the intermediate transfer member, eliminating the need for complex power delivery infrastructure while maintaining image transfer capability
Solution Approach 2:
The system employs self-service by utilizing the inherent electrostatic charges generated during the imaging process itself. The photoconductive drum naturally develops charges during toner deposition, and these charges are directly utilized to transfer the image to the intermediate transfer member without requiring external power sources or active electrical control systems
2Reliability
If electrically biased backup rolls with power cabling are implemented, then electrostatic transfer capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent removes the expensive power supply and cabling components from the system. By extracting these unnecessary elements, the manufacturing cost is significantly reduced while the electrostatic transfer capability is maintained through passive electrostatic interactions between the photoconductive drum and intermediate transfer member
Solution Approach 2:
The system replaces expensive, complex electrical biasing infrastructure with simple, passive electrostatic components. The transfer mechanism relies on naturally generated electrostatic charges rather than costly active electrical systems, reducing both component cost and assembly complexity
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 solution simplifies the imaging device by eliminating the need for complex power supplies and cabling, reducing costs and manufacturing complexity while maintaining effective image transfer efficiency.
Implementation Method 1
A controller directs application of differing voltages from a power supply to the drums and backup rolls that causes electrostatic transfer of the toned image from the drums to the ITM
Data Source
AI summary
An imaging device has first image transfer from photoconductive drums to an intermediate transfer member (ITM) and second image transfer from the ITM to media. Transfer rolls oppose the drums from an opposite side of the ITM and electrically ground to a frame of the imaging device by mechanical connection. The rolls may be laterally offset from the drums. The ITM has relatively low surface and volume resistivity. An imaging subassembly may include the frame, the ITM, and the transfer rolls grounded to the frame.