Bill Processing Drum Tape Winding Stability Control
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Solution Overview
Problem
Conventional temporary holding units in automated teller machines face issues with stably winding bills around a cylindrical drum, particularly when bills have wrinkles or creases, leading to uneven winding diameters and potential damage to tapes due to excessive tensile force.
Innovation Solution
A medium processing device with a cylindrical drum that uses multiple inner and outer tapes wound at different axial positions, featuring detecting units to identify differing regions on the tapes, allowing the control unit to stop the drum rotation before tape terminal ends are reached, preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If multiple inner and outer tapes are wound around the drum at different axial positions to wind bills stably, then the winding stability is improved, but the device complexity increases
Solution Approach 1:
The tape running system is divided into multiple independent tape units (inner tapes and outer tapes) that are wound around the drum at different axial positions. Each tape unit operates independently to provide stable winding, with the drum rotating to wind bills between the tapes. This segmentation allows each tape to contribute to stability without requiring complex coordination mechanisms.
Solution Approach 2:
The inner tapes are wound around the drum at one axial position while outer tapes are wound at different axial positions, creating a nested structure. The inner tapes are positioned within the radial space defined by the outer tapes, forming a concentric arrangement that maximizes winding stability while maintaining a compact structure.
2Productivity
If the drum rotates continuously to wind bills, then the productivity is improved, but the risk of tape damage due to excessive tensile force increases
Solution Approach 1:
Detecting units detect the terminal ends of the tapes in advance before the drum completes its winding operation. When the terminal end is detected, the drum rotation is stopped beforehand to prevent excessive tensile force from damaging the tape. This preliminary detection and stop action protects the tape while maintaining efficient processing.
Solution Approach 2:
Detecting units continuously monitor the tape positions during drum rotation and provide feedback to the control unit. When the terminal end of a tape is detected, the control unit immediately stops the drum rotation. This feedback mechanism ensures that the drum never rotates beyond the tape's physical limits, preventing tape damage while maintaining high productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures stable operation by reliably detecting tape terminal ends and preventing damage, even when bills with wrinkles are processed, maintaining tape integrity and preventing excessive tension.
Implementation Method 1
a tape sensor that emits detection light to a tape position and receives the detection light, thereby generating a light-receiving signal
Data Source
AI summary
A medium processing device includes a drum; plural inner tapes; plural outer tapes; differing regions formed on a starting end portion that is an end at a drum side of at least one of the plural inner tapes or the plural outer tapes, and on a terminal end portion that is an inner reel side or an outer reel side of all of the inner tapes or all of the outer tapes; plural detecting unites that detect the physical property at a tape position of one of the inner tape or the outer tape that has a differing region formed on the starting end portion or the terminal end portion, the tape position being located between the drum and the inner and the outer reels; and a control unit that controls a rotation of the drum based upon the detection results of the plural detecting units.