Sheet Feeding Device Overloading Detection Logic
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Solution Overview
Problem
Existing sheet feeding devices can erroneously detect overloading when the cassette unit is partially drawn out and reattached, leading to incorrect determination of sheet stacking levels.
Innovation Solution
A control unit determines the sheet stacking level by continuously monitoring the sheet detection unit's results as the attachment detection unit changes states from detecting to not detecting the cassette unit's attachment, ensuring accurate assessment of sheet overloading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sheet detection unit detects sheets when the stacking unit is raised, then overloading can be detected, but erroneous detection occurs when the cassette unit is partially drawn out and reattached
Solution Approach 1:
The control unit monitors the detection results of the sheet detection unit and attachment detection unit over time, using feedback to distinguish between temporary detection states and actual overloading conditions. By tracking changes in detection results across multiple processes, the system can determine whether sheets are actually overloaded or if the detection is due to partial insertion/removal of the cassette unit.
Solution Approach 2:
The system transitions from static detection to dynamic monitoring by tracking the state changes of the attachment detection unit and sheet detection unit across multiple processes. This dynamic approach allows the control unit to understand the context of detection results and differentiate between transient states (partial insertion/removal) and stable states (actual overloading).
2Loss of information
If the stacking unit remains raised after partial reattachment, then sheet presence can be detected, but this leads to erroneous overloading determination
Solution Approach 1:
The control unit uses feedback from both the attachment detection unit and sheet detection unit to make accurate determinations. By monitoring the feedback signals across multiple processes, the system can determine whether the sheet detection is due to actual overloading or to the stacking unit remaining raised during partial insertion/removal operations.
Solution Approach 2:
The control unit performs preliminary monitoring of the attachment detection unit's state changes before making overloading determinations. By tracking the attachment state transitions in advance, the system can prevent erroneous overloading determinations from being made during transient states of partial insertion or removal.
Data Source
AI summary
A sheet feeding device includes a sheet storage unit, a stacking unit, a raising unit, a sheet detection unit, an attachment detection unit, and a control unit. The sheet storage unit may be attached to and drawn out of an apparatus main body. The stacking unit is raised by the raising unit and is lowered when the sheet storage unit is drawn out. The attachment detection unit detects attachment of the sheet storage unit to the apparatus main body. The control unit determines whether an amount of sheets stacked on the stacking unit exceeds a predetermined amount based on detection results. If the sheet detection unit continues to detect sheets when the sheet storage unit goes from attached, to not attached, to attached to the apparatus main body, the control unit determines that the amount of sheets stacked on the stacking unit does not exceed the predetermined amount.