Medium Transport Control for Error Detection Accuracy
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Solution Overview
Problem
Existing medium transport systems in image reading apparatuses often erroneously detect temporary transport variations as errors, leading to unnecessary stoppages and potential missed detection of actual errors due to fluctuations in detection values from sensors during specific phases of medium handling.
Innovation Solution
Implementing a control unit that continues medium transport irrespective of sensor detection values during periods of temporary variations, such as when the leading or trailing edge is being nipped or released, or during speed changes, using threshold values to differentiate between normal and abnormal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control unit stops transport based on sensor detection values during all phases, then transport errors can be detected, but temporary transport variations are erroneously detected as errors causing unnecessary stoppages
Solution Approach 1:
The control unit is configured to stop the transport of the medium based on detection values from the sensor only when a specific condition is satisfied: when the medium is being transported at a constant speed. This preliminary condition check prevents erroneous stoppages during temporary variations while maintaining error detection capability during stable transport phases.
2Reliability
If the control unit continuously monitors sensor detection values, then transport errors can be detected, but detection accuracy deteriorates during temporary variations
Solution Approach 1:
The control unit applies different detection criteria to different transport phases. During constant speed transport, the control unit monitors sensor values for error detection. During acceleration or deceleration phases, the control unit suspends error detection to avoid false positives from temporary variations. This local differentiation of detection quality matches the stability characteristics of each transport phase.
3Measurement precision
If the control unit stops transport during temporary variations, then false error detection is prevented, but actual errors during these phases may be missed
Solution Approach 1:
The control unit dynamically adjusts its error detection behavior based on the current transport phase. The system transitions between two operational modes: (1) active error detection mode during constant speed transport, and (2) suspended error detection mode during acceleration/deceleration. This dynamic adaptation ensures detection accuracy is maintained when transport is stable while avoiding false detections during transient phases.
Data Source
AI summary
A medium transport apparatus includes a feeding section configured to nip a medium and feed the medium in a transport direction, a sensor disposed to face a side of the medium being transported in the transport direction, the sensor being configured to detect motion of the medium, and a control unit configured to stop the transport of the medium based on a detection value received from the sensor, in which during a period including a time at which a leading edge of the medium is nipped by the feeding section, the control unit continues transporting the medium irrespective of the detection value from the sensor.