Banknote Stacking Control via Transport Inversion
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Solution Overview
Problem
Existing banknote handling apparatuses face challenges in maintaining uniform stacking due to non-uniform thickness banknotes, leading to potential stacking and feeding failures, and require complex control mechanisms and increased size to address these issues.
Innovation Solution
A paper sheet handling apparatus with an intake unit, transport unit, recognition unit, and stacking unit, controlled by a controller that classifies banknotes based on thickness distribution and orientation, managing their stacking to prevent unnecessary inversion and maintain stability without increasing apparatus size or complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inverting unit is provided at some midpoint of the banknote transport path to prevent stacking identifiers at the same position, then stacking reliability is improved, but the apparatus size increases and transport control becomes complicated
Solution Approach 1:
The patent replaces the mechanical inverting unit with a control-based system. The controller monitors the number of banknotes stacked in the cartridge and determines when inversion is needed, then controls the transport unit to reverse the transport direction. This substitutes complex mechanical inversion structures with a simpler control system that uses the existing transport unit in reverse.
Solution Approach 2:
The patent makes the transport direction dynamic rather than fixed. The transport unit can operate in forward direction to transport banknotes to the cartridge, and in reverse direction to transport banknotes to the discharge unit. This dynamic capability allows the same transport unit to serve multiple functions without requiring separate inverting mechanisms.
2Stability of the object's composition
If the inverting unit is used to invert banknotes based on the number of continuously transported banknotes, then stacking uniformity is improved, but unnecessary inversion occurs and control efficiency decreases
Solution Approach 1:
The patent implements a feedback control system where the controller continuously monitors the actual number of banknotes stacked in the cartridge and uses this information to determine when inversion is necessary. This feedback mechanism ensures inversion occurs only when needed to maintain stacking uniformity, avoiding unnecessary inversions and improving control efficiency.
Solution Approach 2:
The controller predicts when inversion will be needed based on the current stack height and banknote characteristics, and prepares the transport unit accordingly. This preliminary action allows the system to maintain optimal stacking conditions without waiting for problems to occur, improving both uniformity and efficiency.
3Quantity of substance
If banknotes are stacked in alignment with surfaces of adjacent pairs in contact, then stacking compactness is improved, but inclination occurs when identifiers overlap, leading to stacking failure
Solution Approach 1:
The patent uses inversion as a control mechanism to prevent identifier overlap at the same position. By inverting the transport direction at appropriate times, the system ensures that banknotes with identifiers are not continuously stacked in the same orientation, preventing the formation of inclined stacks and maintaining stacking reliability.
Data Source
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AI summary
A paper sheet handling apparatus includes a stacking unit which allows paper sheets transported by a transport unit to be stacked therein in alignment with faces of an adjacent pair of the paper sheets being in contact with each other. A recognition unit recognizes which of a face or back of each of the paper sheets transported faces up, and how each of the paper sheets is oriented. A controller classifies the paper sheets into a plurality of types different in thickness distribution based on the result of recognition, manages the number of paper sheets of each type stacked in the stacking unit, and makes a determination whether to permit the stacking of the paper sheets in the stacking unit based on the type of the paper sheets recognized by the recognition unit, and the number of paper sheets of each type that have been stacked in the stacking unit.