Dynamic Carrying Amount Control for Borderless Printing Edge Contamination
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Solution Overview
Problem
In borderless printing, the existing methods face challenges in efficiently managing the carrying amount during edge printing, leading to reduced printing speed and potential issues with ink landing on the supporting member, which can result in dirty edges and reduced nozzle usability.
Innovation Solution
A printing method that alternates between different carrying amounts based on the detection of the medium's edge by a sensor, adjusting the carrying amount to maximize efficiency and prevent ink from landing on the supporting member, allowing for faster printing and uniform image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a small carrying amount is used during edge printing to prevent ink from landing on the supporting member, then ink contamination is reduced, but printing speed decreases and printing time increases
Solution Approach 1:
The patent dynamically adjusts the carrying amount based on the printing position. During edge printing, a first (smaller) carrying amount is used to prevent ink contamination, while during central printing, a second (larger) carrying amount is used to maintain high printing speed. This dynamic adaptation resolves the contradiction by making the carrying amount variable rather than fixed.
Solution Approach 2:
The patent changes the parameter of carrying amount according to the printing position. By detecting whether the head is printing at the edge or center of the medium, the system switches between different carrying amount values, optimizing both contamination prevention and printing efficiency for each position.
2Object-affected harmful factors
If the carrying amount is reduced during edge printing, then ink is prevented from landing on the supporting member, but the range of dots that can be formed is reduced
Solution Approach 1:
The system dynamically adjusts the carrying amount based on position. At edge positions, a smaller carrying amount limits the dot forming range to prevent ink contamination. At central positions, a larger carrying amount maximizes the dot forming range. This dynamic adjustment resolves the contradiction between contamination prevention and dot forming capability.
Solution Approach 2:
Different carrying amounts are applied to different regions of the medium. The edge region uses a smaller carrying amount to prevent contamination, while the central region uses a larger carrying amount to maximize dot forming range. This local differentiation resolves the contradiction by applying appropriate parameters to appropriate locations.
3Device complexity
If printing is performed with a fixed carrying amount based on predetermined medium size, then control is simplified, but printing accuracy deteriorates when actual medium size differs from specified size
Solution Approach 1:
The patent uses a sensor to detect the actual trailing edge position of the medium during printing. This feedback information is used to dynamically adjust the carrying amount and determine when to switch between different carrying amounts. The feedback mechanism enables the system to adapt to actual medium size variations while maintaining printing accuracy.
Solution Approach 2:
The system transitions from static carrying amount control (based on predetermined medium size) to dynamic carrying amount control (based on actual medium detection). The carrying amount is adjusted in real-time according to the detected trailing edge position, resolving the contradiction between simplified control and printing accuracy.
Data Source
AI summary
A plurality of ejecting nozzles include nozzles opposed to a convex portion of a support in contact with the medium and a nozzle opposed to a concave portion of the support not in contact with the medium. By controlling carrying amounts in the proper circumstances, a dot line can be formed without the nozzle opposed to a convex portion of a supporting member.