Ink Jet Printing Nozzle Array Displacement Adjustment
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Solution Overview
Problem
Ink jet printing apparatuses face challenges in achieving high-speed printing when adjusting for print position displacement between nozzle arrays, particularly when switching between modes that use a single nozzle array and those that use both nozzle arrays, leading to inefficient use of nozzles and reduced printing speed.
Innovation Solution
The apparatus includes a control unit that switches between modes, adjusting the use of nozzles in the first nozzle array and changing the conveying amount of the print medium based on relative print position displacement, allowing for high-speed printing by optimizing nozzle usage and conveying in both single and dual nozzle array modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If print position displacement adjustment is applied between multiple nozzle arrays, then printing position accuracy is improved, but nozzle utilization efficiency deteriorates when printing with a single nozzle array
Solution Approach 1:
The patent implements dynamic adjustment of the conveying amount based on the printing mode. When printing with multiple nozzle arrays, the conveying amount is adjusted to compensate for print position displacement. When printing with a single nozzle array, the conveying amount is set to maximize nozzle utilization without displacement compensation. This dynamic adaptation allows the system to optimize between printing position accuracy and nozzle utilization efficiency depending on the operational mode.
Solution Approach 2:
The patent changes the conveying amount parameter based on the printing mode. In multi-nozzle array mode, the conveying amount is adjusted to maintain printing position accuracy. In single-nozzle array mode, the conveying amount is optimized to utilize all nozzles in the array. This parameter change enables the system to resolve the contradiction by selecting the appropriate conveying amount according to the specific printing requirements.
2Productivity
If a longer nozzle arrangement length is used for high-speed printing, then printing speed is improved, but ink bleeding between black ink and color ink increases
Solution Approach 1:
The patent segments the nozzle arrays into different functional groups - a black nozzle array with longer arrangement length for high-speed monochrome printing and color nozzle arrays with shorter arrangement lengths for color printing. By segmenting the functionality, the system can use the longer black nozzle array when printing only black ink to achieve high speed, while using the shorter color nozzle arrays when printing color to prevent ink bleeding. Each segment is optimized for its specific printing task.
3Manufacturing precision
If the black nozzle array uses only a part of its nozzles to match color ink positioning, then printing position accuracy is improved, but printing speed deteriorates
Solution Approach 1:
The patent dynamically determines the number of nozzles to use in the black nozzle array based on the printing mode. When printing with both black and color ink, the system uses only the necessary portion of the black nozzle array to maintain position accuracy. When printing only black ink, the system activates all nozzles in the black nozzle array to maximize printing speed. This dynamic configuration allows the system to optimize between position accuracy and printing speed according to the operational requirements.
Data Source
AI summary
In an ink jet printing apparatus including a plurality of nozzle arrays, if a print position displacement between the nozzle arrays is adjusted, it is possible to perform high-speed printing at the time of performing a printing operation using only a single nozzle array. Specially at the time of changing a printing state of using a first nozzle array and a second nozzle array into a printing state of using the first nozzle array only, a conveying amount of the printing medium is changed in accordance with the displacement of the printing medium.