Printer Sheet Size Detection Without Feeding
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Solution Overview
Problem
Conventional printers require feeding a portion of the printing medium to detect its size, leading to potential waste and inefficiency, as the automatic detection function necessitates a certain amount of medium to be fed for accurate measurement.
Innovation Solution
A system where an information processing apparatus receives user input for sheet size measurement, transmits requests to the printer to measure width and length, extracts matching sheet data, and prompts the user to select the appropriate sheet size, allowing for efficient setting without unnecessary medium usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the automatic detection function feeds the sheet to detect the size, then the sheet size can be detected accurately, but the fed portion of the sheet is wasted uselessly
Solution Approach 1:
The detection process is segmented into two independent stages: width detection (which does not require sheet feeding) and length detection (which requires feeding). By separating these functions, the system can obtain width information without wasting sheet material, while still performing length detection when necessary.
Solution Approach 2:
The system performs only the necessary portion of the detection action. Width detection is performed without feeding the sheet (partial action), and length detection is performed only when width detection is insufficient (excessive action only when needed). This reduces unnecessary sheet consumption while maintaining detection accuracy.
2Extent of automation
If the automatic detection function feeds the sheet to detect the size, then the sheet size can be detected, but the detection process consumes time and material
Solution Approach 1:
The automated detection process is divided into sequential stages: first width detection (quick, no feeding required), then length detection (slower, feeding required). This segmentation allows the system to complete detection faster by obtaining partial information (width) without time-consuming sheet feeding, and only performing full detection when necessary.
Solution Approach 2:
The system performs partial detection (width only) when sufficient for the task, avoiding the time-consuming full detection process. Length detection is performed only when the width detection result is insufficient to identify the sheet type, thus reducing overall detection time while maintaining automation.
Data Source
AI summary
When receiving a sheet size measurement instruction through a user interface, an information processing apparatus transmits a width measurement instruction to a printer through a communication I/F. When receiving a measurement result of a sheet width from the printer, a controller extracts sheet information that meets the received measurement result and displays the extracted sheet information for user selection. When a user selection is received, the controller updates a print setting with selected sheet information. When a user selection is not received, the controller transmits a type-designated measurement instruction designating the sheet type. When the measurement result is received, the controller updates the print setting with a sheet length information included in the received measurement result.