Print Head Control Device for Streak Suppression
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Solution Overview
Problem
Existing printing technologies do not effectively consider the holding state of the print medium during printing, leading to potential image quality issues such as black or white streaks and density unevenness due to variations in conveyance and distance stability between the print head and the medium.
Innovation Solution
A control device that alternately executes partial printings and medium conveyance operations, utilizing a conveyor system with rollers to manage the print medium along a curved path, adjusts the length of printed images based on holding states to stabilize the distance and reduce density differences between partial images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If printing is executed through multiple scanning operations in an overlapping area, then the occurrence of black streak or white streak can be suppressed, but density unevenness occurs due to variation in conveyance amount
Solution Approach 1:
The patent changes the printing parameters (recording rate, number of dots) in the overlapping area based on the holding state of the print medium. When the medium is held by the third roller, the system increases the recording rate or number of dots to compensate for potential conveyance variations, thereby maintaining density uniformity while suppressing streaks.
Solution Approach 2:
The system determines the holding state of the print medium (whether held by the third roller or not) and uses this information to adjust printing parameters dynamically. This feedback mechanism allows the system to adapt printing conditions to actual conveyance stability, resolving the contradiction between streak suppression and density uniformity.
2Device complexity
If the print medium is not held by the third roller during conveying, then the conveying path can be simplified, but the distance between the print medium and print head becomes unstable
Solution Approach 1:
The system dynamically adjusts printing parameters based on the holding state of the print medium. When the third roller is not holding the medium, the system modifies recording rates or dot patterns to compensate for distance instability, allowing the conveying path to remain simple while maintaining print quality through adaptive control.
Solution Approach 2:
The patent changes printing parameters (such as recording rate, dot size, or dot spacing) according to whether the third roller is holding the print medium. This allows the system to maintain distance stability through parameter adjustment rather than through complex mechanical constraints.
3Manufacturing precision
If the length of the second partial image is increased to reduce density difference, then the image quality improves, but the printing time increases
Solution Approach 1:
The system adjusts the length of the second partial image dynamically based on the holding state of the print medium. When the medium is stably held, the system can use longer second partial images to reduce density differences. When holding is unstable, the system optimizes the length to balance quality and speed, preventing excessive printing time while maintaining acceptable density uniformity.
Data Source
AI summary
A control device that controls a printing execution unit to execute printing by alternately executing partial printings, which forms the dot using the print head, and print medium conveying, which conveys the print medium using the conveyor, the conveyor including: a first roller; a second roller; and a third roller, wherein a first holding state is a state where the print medium is held by the first roller, is held by the second roller, and is held by the third roller, a second holding state is a state where the print medium is held by the first roller, is held by the second roller, and is not held by the third roller, and a length of the second partial image printed in the first holding state is longer than a length of the second partial image printed in the second holding state.