Print Blanket Contact Control for LEP Drum Wear Reduction
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Solution Overview
Problem
In electro-photography printing devices, particularly in liquid EP (LEP) systems, the print blanket undergoes significant wear due to repeated contact pressure and interaction with the impression drum during both normal printing and null cycles, leading to premature degradation and quality issues, as well as increased damage during null cycles when no ink is transferred.
Innovation Solution
Implementing a system that detects the onset of a null cycle and adjusts the contact between the print blanket and the impression drum by increasing the distance between the drum axes, thereby reducing the contact pressure from the normal printing level to a null level, which minimizes damage during null cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the print blanket maintains continuous contact pressure with the impression drum during null cycles, then the structural stability and alignment of the printing system is preserved, but the wear and damage to the print blanket increases significantly
Solution Approach 1:
The patent applies the dynamics principle by making the contact pressure between the print blanket and impression drum adjustable rather than fixed. The system dynamically changes the contact pressure based on operational mode: maintaining normal printing contact pressure during active printing cycles, and reducing to a reduced contact pressure during null cycles. This dynamic adjustment allows the system to preserve structural stability when needed while minimizing blanket wear during idle periods, directly resolving the technical contradiction between stability and reliability.
2Reliability
If the contact pressure between print blanket and impression drum is reduced during null cycles, then the wear on the print blanket is minimized, but the risk of misalignment and loss of printing precision increases
Solution Approach 1:
The patent applies parameter changes by systematically varying the contact pressure parameter between two defined states: normal printing contact pressure and reduced contact pressure. The system transitions between these parameter states based on the printing cycle status. During null cycles, the contact pressure parameter is reduced to minimize wear, while during active printing, it returns to normal levels to ensure printing precision. This controlled parameter variation resolves the contradiction by ensuring precision is maintained when needed while allowing wear reduction during idle periods.
3Productivity
If the system maintains normal printing contact pressure continuously, then the readiness for immediate printing is ensured, but the mechanical damage and dry-related damage to the print blanket accelerates
Solution Approach 1:
The patent applies periodic action by implementing a cyclical pattern of contact pressure adjustment that synchronizes with the printing cycle. The system alternates between normal contact pressure during active printing periods and reduced contact pressure during null cycles. This periodic variation in contact pressure ensures the system remains ready for printing (by maintaining normal pressure during print cycles) while periodically reducing damage accumulation (by reducing pressure during null cycles), thereby resolving the contradiction between productivity and harmful factors.
Data Source
AI summary
In an example, a method of controlling voltage applied to a print blanket within a printing device includes printing a print job. During the printing, a null cycle trigger is received. In response to the trigger, contact between a print blanket and an impression drum is reduced.