Line Printhead Timing Control for Suction Platen Paper Float
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Solution Overview
Problem
Existing printing technologies face issues with paper floating and ink landing position shifts due to changes in suction resistance and transport speed as the leading end of the printing medium moves past a suction platen, leading to inconsistent print quality.
Innovation Solution
A printing apparatus with a support portion having suction holes and a line-type printing head, controlled by an ejection timing unit that adjusts ink ejection timing based on the position of the leading end relative to different regions on the support portion, ensuring earlier ejection timing when the leading end is upstream and later timing when it is downstream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a suction platen is used to suppress paper floating, then paper floating is suppressed, but ink landing position shifts occur due to changing suction resistance
Solution Approach 1:
The patent applies dynamics by making the ejection timing variable rather than fixed. The ejection timing is dynamically adjusted based on the position of the leading end of the printing medium, changing from first ejection timing in the first region to second ejection timing in the second region, thereby adapting to the changing suction resistance and maintaining consistent ink landing positions.
Solution Approach 2:
The patent changes the parameter of ejection timing based on the position of the printing medium. By switching between different ejection timing values (first ejection timing and second ejection timing) corresponding to different regions, the system compensates for variations in suction resistance and maintains precise ink placement.
2Device complexity
If ejection timing is fixed, then control is simplified, but ink landing position shifts due to transport speed changes
Solution Approach 1:
The support portion is divided into multiple regions (first region and second region) along the transport direction. Each region has its own designated ejection timing, allowing the system to manage complexity through segmentation while maintaining precision in each segment.
3Manufacturing precision
If the leading end position is monitored and ejection timing is adjusted, then ink landing position stability is improved, but control complexity increases
Solution Approach 1:
Different ejection timing parameters are applied to different local regions of the support portion. The first ejection timing is used when the leading end is in the first region, and the second ejection timing is used when the leading end is in the second region, ensuring optimal performance for each local condition.
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 stabilizes ink landing positions, maintaining print quality by adapting to changes in suction resistance and transport speed, thereby reducing shifts and ensuring consistent printing across the medium.
Implementation Method 1
a support portion 5 including a plurality of suction holes 10, and configured to support the printing medium while suctioning the printing medium via the suction hole
Data Source
AI summary
A printing apparatus in which a support portion suctions a printing medium via a plurality of suction holes disposed in a transport direction of the printing medium, a line type printing head ejects ink onto the printing medium moved on the support portion by a transport unit, an ejection timing control unit controls ejection timing such that first ejection timing is earlier than second ejection timing, where ejection timing when a leading end of the printing medium in the transport direction is positioned in a first region of the support portion is defined as the first ejection timing, and ejection timing when the leading end is positioned in a second region of the support portion positioned downstream of the first region in the transport direction is defined as the second ejection timing.