Sheet Transportation Device Dual Detection for Small Sheet Positioning
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Solution Overview
Problem
Existing sheet transportation devices face challenges in detecting the position of small-size sheets accurately, leading to potential transportation failures due to positional deviations during the feeding process.
Innovation Solution
A sheet transportation device is designed with a first detection unit downstream and a second detection unit upstream in the transportation direction, allowing for accurate detection of small-size sheet leading ends, and a control unit that initiates feeding based on the detection results, ensuring proper alignment and preventing misfeeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single detection unit is used to detect sheet position, then device complexity is reduced, but measurement precision for small-size sheets deteriorates
Solution Approach 1:
The detection system is segmented into multiple detection units positioned at different locations (upstream and downstream of the feeding unit). Each unit detects the leading end position of sheets of different sizes, allowing precise detection for small-size sheets without increasing overall system complexity excessively.
Solution Approach 2:
The solution adds a spatial dimension by positioning detection units at different locations along the sheet transportation path. This dimensional arrangement enables the system to distinguish between small-size and normal-size sheets based on their leading end positions, improving measurement precision without requiring complex detection mechanisms.
2Productivity
If feeding speed is increased to improve productivity, then transportation time is reduced, but reliability of sheet transportation deteriorates due to positional deviation
Solution Approach 1:
The detection units perform preliminary detection of the leading end position of sheets before they enter the feeding unit. By identifying the position in advance, the control unit can adjust feeding parameters to compensate for potential positional deviations, ensuring reliable transportation even at high speeds.
Solution Approach 2:
The system implements feedback by continuously monitoring the leading end position of sheets using detection units and adjusting the feeding operation accordingly. This closed-loop control ensures that positional deviations are corrected in real-time, maintaining transportation reliability while operating at high feeding speeds.
Data Source
AI summary
A sheet transportation device includes a sheet loading table, a feeding unit that feeds a sheet placed on the sheet loading table, a first detection unit that is provided downstream of the feeding unit in a sheet transportation direction and that detects a position of a leading end of the sheet, a second detection unit that is provided upstream of the feeding unit in the sheet transportation direction and that detects a position of a leading end of a small-size sheet which is smaller than the sheet detected by the first detection unit, and a control unit that starts feeding the sheet based on a result of detection performed by any of the first detection unit or the second detection unit in accordance with a size of the sheet.