Printing Device Clamped State Transition Control
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Solution Overview
Problem
Conventional printing devices face challenges in maintaining image quality during the transition from a double-clamped to a single-clamped state, leading to potential declines in printing quality due to changes in the clamped state of the print medium.
Innovation Solution
A printing device with a print head, conveying portion, and main scanning portion, utilizing multiple print methods and control units to manage the clamped state transitions, ensuring consistent image quality by adjusting the print operation based on the clamped state, and employing a shingling printing method for special raster lines to distribute conveying errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the printing method is switched from large conveying distance to small conveying distance at the transition from double-clamped to single-clamped state, then the printing region is expanded, but the image quality may decline during and after the transition
Solution Approach 1:
The printing region is divided into three distinct regions: first region printed in double-clamped state, third region printed during transition, and second region printed in single-clamped state. Each region uses appropriate printing method to ensure quality while expanding overall printable area.
Solution Approach 2:
The print control processor forms dots to form at least one special raster line during both first scan and second scan before completing the transition. This preliminary action ensures that special raster lines are properly formed despite the changing clamped state, preventing image quality decline.
2Manufacturing precision
If interlaced printing is used to print at higher resolution with smaller line spacing than nozzle pitch, then printing resolution is improved, but the pitch of dots in sub-scanning direction becomes smaller than nozzle pitch requiring precise conveying
Solution Approach 1:
The printing resolution is set such that line pitch is smaller than nozzle pitch, enabling higher resolution interlaced printing. This parameter change allows the system to achieve finer dot spacing in the sub-scanning direction while managing conveying precision requirements through state-based control.
Solution Approach 2:
The print control processor monitors the clamped state of the print medium and adjusts the printing method accordingly. By detecting whether the medium is in double-clamped or single-clamped state, the system dynamically selects appropriate printing methods to maintain reliability despite conveying variations.
3Adaptability or versatility
If the clamped state of the print medium changes from double-clamped to single-clamped during printing, then the conveying mechanism transitions states, but this causes potential decline in printing quality
Solution Approach 1:
The printing system dynamically adapts to changing clamped states by switching between different printing methods. The print control processor adjusts printing parameters in real-time based on the current state, allowing the system to maintain printing quality throughout the transition from double-clamped to single-clamped state.
Solution Approach 2:
Different printing methods are applied to different regions of the print medium based on the local clamped state. The first region uses printing method for double-clamped state, the third region uses combination method during transition, and the second region uses printing method for single-clamped state, ensuring each region receives appropriate treatment for optimal quality.
Data Source
AI summary
In a printing device, a first control unit prints, by a first print method, an image on a first region of a recording sheet in a first state in which a recording sheet is clamped by both an upstream and downstream clamping portions. A second control unit prints, by a second print method, an image on a second region of the recording sheet in a second state in which the recording sheet is clamped either one of the upstream and downstream clamping portions. A third control unit prints, by a combination of the first and second print methods, an image on a third region of the recording sheet between the first and second regions. When the third control unit prints the image on the third region, a state of the recording sheet is set to be changed from the first state to the second state.