LEP Developer Transmission Speed Control
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Solution Overview
Problem
Liquid electro-photographic (LEP) printing faces issues with flow streaks due to unequal surface speeds between the squeegee and developer rollers, which existing transmission systems fail to adequately address without additional electronics or changes to the printer chassis.
Innovation Solution
A mechanical drive train transmission system that slows the rotational speed of the squeegee roller relative to the cleaner and developer rollers, using a gear train with seven gears to achieve a surface speed reduction of 10% to 40% while maintaining the same roller positions and space, allowing for implementation without additional electronics or changes to the developer unit housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the squeegee roller is driven at the same rotational speed as the developer roller, then the transmission system is simpler, but flow streaks occur due to unequal surface speeds
Solution Approach 1:
The patent changes the rotational speed parameter of the squeegee roller relative to the developer roller. By reducing the squeegee roller's rotational speed to 50-80% of the developer roller's speed, the surface speeds become more equal, preventing flow streaks and improving print quality without requiring complete redesign of the transmission system
Solution Approach 2:
The patent introduces a variable speed drive mechanism that dynamically adjusts the rotational speed of the squeegee roller. This allows the system to adapt the speed ratio between squeegee and developer rollers based on operating conditions, resolving the contradiction between maintaining simple transmission and achieving equal surface speeds
2Reliability
If the squeegee roller surface speed is reduced to prevent flow streaks, then print quality improves, but the roller position and space requirements change
Solution Approach 1:
The patent resolves the spatial conflict by introducing an intermediate transmission stage between the developer roller and squeegee roller. This additional dimensional element in the power transmission path allows speed reduction while maintaining the original roller positions and spacing within the developer unit housing
3Reliability
If a speed reduction mechanism is added to the transmission system, then flow streaks are reduced, but the transmission system becomes more complex
Solution Approach 1:
The patent replaces complex mechanical speed reduction mechanisms with an electrical variable speed drive system. This substitution uses electronic control to adjust motor speed, achieving the desired squeegee roller speed reduction while actually simplifying the overall system by eliminating complex mechanical gear trains or belt systems
Data Source
AI summary
A transmission for a developer unit that includes a developer roller to apply LEP ink to a photoconductor, a cleaner roller to clean the developer roller, and a squeegee roller to squeegee ink on the developer roller. In one example, the transmission includes a mechanical drive train to, with the cleaner roller, simultaneously drive the developer roller at a first surface speed and the squeegee roller at a second surface speed slower than the first surface speed.