Multi Feed Detection Device Paper Transport Control
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Solution Overview
Problem
In paper transport devices, excessively short intervals between sheets of paper hinder the adjustment processing period for multi feed detectors, which is essential for responding to changes due to temperature effects and other factors.
Innovation Solution
A multi feed detection device with a position detector and a multi feed detector positioned downstream, where multi feed detection is stopped when the leading end of the next paper is detected, allowing an adjustment processing period by ensuring the trailing end of the previous paper is on the upstream side of the multi feed detector, enabling initialization, output checking, and reference value setting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the interval between sheets of paper is reduced to increase paper transport capacity, then productivity is improved, but the adjustment processing period for the multi feed detector cannot be secured, worsening reliability
Solution Approach 1:
The control section stops multi feed detection before the trailing end of the current sheet reaches the multi feed detector, thereby preliminarily securing the adjustment processing period needed for the detector to respond to temperature changes and maintain detection accuracy. This preventive action ensures the detector is properly adjusted before the next sheet arrives, even at high transport speeds.
2Reliability
If multi feed detection is continuously performed to ensure detection accuracy, then reliability is improved, but the adjustment processing period is lost, worsening the ability to respond to temperature effects
Solution Approach 1:
Multi feed detection is performed periodically rather than continuously. The control section stops detection at specific intervals when the trailing end of a sheet approaches the multi feed detector, allowing the detector to perform adjustment processing. Detection resumes when the next sheet's leading end approaches, creating a periodic detection pattern that balances reliability with the need for adjustment time.
3Productivity
If the paper transport speed is increased to improve efficiency, then productivity is improved, but the interval between sheets becomes excessively short, worsening the ability to secure adjustment processing period
Solution Approach 1:
The detection control dynamically adapts to paper transport speed. At higher transport speeds where sheet intervals are shorter, the control section stops multi feed detection earlier relative to the sheet position to ensure the adjustment processing period is secured. This dynamic adjustment of detection timing allows the system to maintain reliable multi feed detection even at high productivity levels.
Data Source
AI summary
A multi feed detection device includes a position detector that detects a position of paper being transported, a multi feed detector that is disposed on a downstream side of the position detector in a paper transport direction and detects multi feed of the paper being transported, and a control section that performs control such that multi feed detection by the multi feed detector is stopped when a leading end of paper being transported next to paper, on which multi feed detection is executed by the multi feed detector, is detected by the position detector.