Banknote Storage Feeding Torque Control for Jam Prevention
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Solution Overview
Problem
In a drum winding system used in automatic teller machines, inconsistencies in banknote winding diameter lead to differences in tape speeds and tensions between pairs of tapes, causing instability and increased likelihood of jams during storage and feeding.
Innovation Solution
The implementation of independently controlled torque units at each tape reel ensures constant tensions between the tapes and the drum, using multiple sets of tapes and reels with separate rotation axles to maintain consistent tape speeds and tensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple pairs of tapes are used to nip banknotes at multiple positions, then nipping stability should improve, but differences in tape speeds and tensions between tape pairs cause instability and jams
Solution Approach 1:
The patent divides the tape reel system into multiple independent units, with each tape reel equipped with its own torque limiter. This segmentation allows each tape pair to have independent tension control, resolving the contradiction by enabling multiple tape pairs to maintain consistent tensions despite potential speed differences, thereby preventing jams while preserving nipping stability.
Solution Approach 2:
The patent introduces torque limiters that actively regulate the tension parameter of each tape pair. By changing the tension parameter through mechanical torque limitation, the system ensures that all tape pairs maintain consistent tensions even when winding diameters vary due to uneven banknote thicknesses, thus preventing the instability and jams that would otherwise occur.
2Stability of the object's composition
If constant tension is applied to tapes, then tape speed differences are reduced, but uneven banknote thicknesses cause winding diameter inconsistencies that lead to tape speed differences
Solution Approach 1:
The patent applies torque limiters at the tape reel level, which preliminarily control the tension before the tapes reach the drum. This preliminary tension equalization compensates for the speed differences caused by varying winding diameters, ensuring that tape tension consistency is maintained despite the underlying speed variations from uneven banknote thicknesses.
Data Source
AI summary
A medium storage and feeding device and a medium processing device that may prevent occurrences of faults more reliably than the related art. A drum (21) is provided that winds up a banknote BL nipped by pairs of tapes (28L, 28R, 30L and 30R) together with the pairs of tapes. Torque limiters (25L, 25R, 27L and 27R) are separately provided at each of tape reels (24L, 24R, 26L and 26R). The torque limiters control torques between the tape reels and reel rotation axle shafts (22 and 23), such that tensions applied to the tapes between the tape reels (24L, 24R, 26L and 26R) and the drum (21) are constant. Thus, tensions on the tapes between the respective tape reels and the drum may be kept constant, banknote nipping stability may be improved, and occurrences of faults may be prevented more reliably than in the related art.