Separation Roller Friction Gradient for Banknote Jam Prevention
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Solution Overview
Problem
Conventional banknote separating devices face issues with paper jams and skewing due to high frictional forces between banknotes and separation rollers, leading to increased manufacturing costs and operational difficulties.
Innovation Solution
A banknote separating device with a separation roller having a central portion made of rubber and end portions made of resin, where the entire circumferential surface facing the sending roller is exposed, and the end portions have a smaller friction coefficient than the central portion, allowing for smooth banknote separation and reduced jam occurrence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire circumferential surface of the separation roller is formed of rubber material with high friction coefficient, then banknotes are prevented from overlapping and are guided to the contact portion, but banknotes may be stopped by excessive frictional force causing paper jams
Solution Approach 1:
The separation roller is designed with different friction coefficients in different regions: the central portion has a high friction coefficient (rubber material) to guide banknotes to the contact portion, while the end portions have a low friction coefficient (resin material) to prevent excessive friction that causes paper jams. This local differentiation of material properties resolves the contradiction between preventing overlap and avoiding paper jams.
Solution Approach 2:
The separation roller uses a composite structure combining rubber material in the central portion and resin material in the end portions. This composite material approach allows the roller to simultaneously provide high friction for guidance and low friction to prevent jams, resolving the technical contradiction through material composition.
2Ease of operation
If the separation roller is formed of rubber material, then banknotes are guided to the contact portion, but the leading edge of banknotes may be stopped by frictional force when contacting the circumferential surface separated from the contact portion
Solution Approach 1:
The separation roller differentiates friction coefficients locally: the central portion maintains high friction for effective banknote guidance, while the end portions use low friction resin material to prevent the leading edge from being stopped during conveyance, thus avoiding paper jams.
3Ease of operation
If the sending port is formed larger than banknote thickness and length, then banknotes can be smoothly sent from the storage unit, but the leading edge may contact the circumferential surface at a position separated from the contact portion causing jam
Solution Approach 1:
The separation roller's end portions are made of low friction resin material to complement the larger sending port design. This allows banknotes to be smoothly ejected while the low friction end portions prevent the leading edge from being stopped if it contacts the roller at positions away from the contact portion.
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 effectively prevents skewing and jams, reduces manufacturing costs by eliminating the need for additional guiding mechanisms, and enhances the reliability of the separation process.
Implementation Method 1
The leading edge of the banknote 102 is sent to a contact portion 120, in which the separation roller 116 and the sending roller 117 contact each other, by a frictional force between the overlapped banknotes 102 after coming in contact with the circumferential surface of the separation roller 116.
Data Source
AI summary
In the separation roller, an entire area of a circumferential surface of the separation roller facing the sending roller is exposed to come in direct contact with the banknote, moving from the storage unit, on the storage unit side with respect to a contact portion which is in contact with the sending roller, both end portions in an axial direction of the separation roller are formed of a material having a friction coefficient smaller than that of a central portion thereof, and the diameter of the both end portions is the same as the diameter of the central portion.