Banknote Winding Drum Control for Even Distribution
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Solution Overview
Problem
Conventional paper sheet processing devices with winding drums face issues of uneven winding due to the outer peripheral length of the tape becoming equal to the storing pitch, leading to banknotes being wound up on the same position, causing control challenges and potential jamming.
Innovation Solution
A paper sheet processing device with a control unit that adjusts the storing pitch relative to the outer peripheral length of the tape wound up by the winding drum, ensuring the storing pitch deviates from a predetermined range to prevent uneven winding, by controlling the receiving cycle and tape winding amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the outer peripheral length of the winding drum is reduced to achieve a smaller device size, then the device size is reduced, but the banknotes become unevenly wound on substantially the same position on the winding drum
Solution Approach 1:
The patent changes the parameter of storing pitch to be different from the outer peripheral length of the tape. Specifically, the control unit adjusts the rotational amount of the winding drum per receiving cycle so that the storing pitch (distance between front edges of consecutively wound banknotes) deviates from the outer peripheral length of the tape, preventing the banknotes from being wound on substantially the same position.
Solution Approach 2:
The control unit continuously monitors the outer peripheral length of the tape and adjusts the storing pitch accordingly. The control unit calculates the outer peripheral length based on the number of wound banknotes and dynamically adjusts the rotational amount of the winding drum to maintain the condition that storing pitch differs from the outer peripheral length, providing real-time feedback control to prevent uneven winding.
2Productivity
If the outer peripheral length of the tape becomes equal to the storing pitch, then the banknotes are wound efficiently, but the banknotes are wound up on substantially the same position causing center of gravity displacement and potential jamming
Solution Approach 1:
The patent deliberately changes the parameter relationship by ensuring that the storing pitch is kept different from the outer peripheral length of the tape. The control unit adjusts the rotational amount of the winding drum so that the storing pitch deviates from the outer peripheral length, preventing the harmful condition where banknotes are wound on substantially the same position while still maintaining efficient winding operation.
Solution Approach 2:
The control unit proactively prevents the condition where outer peripheral length equals storing pitch by continuously adjusting the storing pitch based on the current outer peripheral length of the tape. This preliminary anti-action ensures that the banknotes are distributed more uniformly around the winding drum, preventing center of gravity displacement and potential jamming before they occur.
3Speed
If banknotes are wound up in a constant cycle with a small winding drum, then the processing speed is maintained, but one hundred or more banknotes may be unevenly wound on substantially the same position
Solution Approach 1:
The patent makes the storing pitch dynamic rather than constant. The control unit continuously adjusts the rotational amount of the winding drum per receiving cycle based on the current outer peripheral length of the tape. This dynamic adjustment ensures that even with constant processing speed and small winding drum, the banknotes are distributed more uniformly around the drum circumference, preventing mass accumulation at the same position.
Data Source
AI summary
The present invention avoids a problem in that wound-up banknotes are located unevenly on substantially the same position on a winding drum. The paper sheet processing device is configured to process paper sheets. The paper sheet processing device includes: a receiving unit configured to receive paper sheets one by one in a predetermined receiving cycle; a transport unit configured to transport the paper sheets received by the receiving unit; a storing and feeding unit including a winding drum that winds up the paper sheets together with a tape, the storing and feeding unit being configured to receive and feed the paper sheets transported by the transport unit, by winding up and winding off the tape; a drive unit configured to drive the receiving unit, the transport unit, and the storing and feeding unit: and a control unit configured to control the drive unit to maintain a tape winding amount per receiving cycle, such that a storing pitch of the paper sheets wound up by the winding drum deviates from a predetermined range relative to an outer peripheral length of the tape wound up by the winding drum.