Liquid Discharging Device Timing Control for Sheet Size Adaptation
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Solution Overview
Problem
Existing liquid discharging devices, such as printers, face challenges in determining optimal discharging timings for recording sheets of varying sizes due to differences in corrugated shapes, leading to suboptimal ink distribution and image quality.
Innovation Solution
A liquid discharging device with a controller that adjusts discharging timings based on gap information and position data, using a combination of pre-stored delay amounts and dynamically generated delay amounts to ensure precise ink placement across different sheet sizes and shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If discharging timings are determined based on pre-stored deviation amounts for a specific sheet size, then the discharging timings are optimal for that specific size, but the discharging timings are not optimal for recording sheets of different sizes
Solution Approach 1:
The system dynamically determines discharging timings based on the actual recording sheet size being used. Instead of relying on fixed pre-stored deviation amounts for a specific size, the controller calculates appropriate discharging timings by considering the actual sheet dimensions, contact part positions, and gap information, allowing optimal performance across various sheet sizes
Solution Approach 2:
The system changes the discharging timing parameters based on the recording sheet size. By detecting the actual sheet size and calculating corresponding discharging timings that account for variations in sheet dimensions and resulting corrugated shapes, the system adapts the timing parameters to maintain optimal ink placement precision across different sheet sizes
2Productivity
If a recording sheet with smaller dimension is used, then the sheet cannot contact every corrugating plate or rib, but the corrugated shape becomes different from the reference sheet
Solution Approach 1:
The system performs preliminary detection of the recording sheet size and position before the printing process. By obtaining the end position of the sheet and determining which contact parts actually contact the sheet, the system can pre-calculate the appropriate discharging timings that account for the specific corrugated shape that will be formed, ensuring accurate ink placement despite variations in sheet size
Solution Approach 2:
The system uses feedback from sheet detection (end position obtaining process) to adjust the discharging timings. By monitoring which contact parts contact the sheet and calculating the resulting gap information, the system feedback-adjusts the discharging timings to compensate for variations in corrugated shape, maintaining consistent printing quality across different sheet sizes
3Device complexity
If discharging timings are determined without considering actual sheet position and contact parts, then the control process is simple, but the ink discharge timing becomes inaccurate
Solution Approach 1:
The system segments the control process into distinct functional modules: end position obtaining process, position determining process, gap information generating process, and discharging-timing determining process. Each module handles a specific aspect of the timing determination, making the overall complex process manageable and systematic while ensuring accurate ink discharge timing through coordinated operation of these segmented functions
Solution Approach 2:
The system performs preliminary calculations to determine discharging timings based on actual sheet characteristics. By pre-calculating the timing adjustments needed based on detected sheet position and contact part configuration, the system prepares accurate timing data before the actual printing process, ensuring precision without requiring complex real-time adjustments during printing
Data Source
AI summary
A liquid discharging device including a liquid discharging head with nozzles, a carriage, and a controller is provided. When a position of the end of a sheet is on an inner side of an outmost contact part among a plurality of contact parts along a scanning direction, the controller determines discharging timings to discharge liquid from the nozzles based on first gap information, which is related to a gap between the sheet and the liquid discharging surface and is stored in a gap information storage. When the position of the end of the sheet is on the inner side of the outmost contact part, the controller determines the discharging timings based on the first gap information stored in the gap information storage and on second gap information generated in a gap information generating process.