Dynamic Fault Detection Period for Medium Feeding Apparatus
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Solution Overview
Problem
Existing medium feeding apparatuses face challenges in accurately detecting feeding faults, particularly trailing-edge binding faults, due to improper determination caused by vibrations, especially when media of different sizes are fed, leading to unnecessary cessation of feeding operations.
Innovation Solution
A medium feeding apparatus with a movement detection unit and a control unit that adjusts the fault detection period based on the size of the medium, setting a shorter period for smaller sizes to minimize improper determinations due to vibrations, and includes a width size detection unit to accurately assess medium size and position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed fault detection period is used for all medium sizes, then the detection process is simple, but improper fault determination occurs due to vibrations when small media are fed
Solution Approach 1:
The fault detection period is made dynamic rather than fixed. The control unit automatically adjusts the detection period length based on the detected medium size: using a shorter period for small media and a longer period for large media. This dynamic adaptation resolves the contradiction by maintaining high detection accuracy across different medium sizes while avoiding unnecessary complexity through automated size-based adjustment.
Solution Approach 2:
The detection period parameter is changed according to medium size. When a small medium is detected, the system switches to a shorter detection period to avoid vibration-induced false positives. When a large medium is detected, the system uses a longer detection period for thorough fault detection. This parameter adaptation resolves the contradiction between reliability and complexity.
2Reliability
If a longer fault detection period is used, then vibration-induced false detections are reduced, but feeding efficiency decreases due to longer monitoring time
Solution Approach 1:
The detection period is dynamically adjusted based on medium size characteristics. For small media that are more susceptible to vibration effects, a shorter detection period is used to maintain feeding efficiency while still detecting actual faults. For large media, a longer period can be used since they are less affected by vibrations. This dynamic approach resolves the contradiction between reliability and productivity.
Solution Approach 2:
The system changes the detection period parameter according to the medium size detected. By using shorter periods for small media and longer periods for large media, the system optimizes the balance between accurate fault detection and maintaining high feeding efficiency, resolving the contradiction between reliability and productivity.
3Productivity
If a shorter fault detection period is used, then feeding efficiency is maintained, but improper fault determination occurs due to vibrations
Solution Approach 1:
Different detection period qualities are applied locally based on medium size. Instead of using a uniform detection period for all media, the system applies a shorter detection period specifically for small media to maintain efficiency, and a longer period for large media to ensure accuracy. This localized adaptation resolves the contradiction between productivity and reliability.
Data Source
AI summary
A control unit of a medium feeding apparatus is configured to execute a fault detection process to determine that there is a feeding fault when a movement of a subsequent medium in a feeding direction is detected based on detection information of a movement detection unit within a fault detection period that is set after a trailing edge of a preceding medium is detected based on the detection information of the movement detection unit and before feeding of the subsequent medium is started, and the fault detection period set when a size of the medium in a width direction intersecting the feeding direction is a first size is shorter than the fault detection period set when the size of the medium in the width direction is a second size larger than the first size.