Bill Validator Centering Device Simplification
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Solution Overview
Problem
Existing bill validators have complex centering devices with numerous structural components, requiring frequent maintenance and inspection to centralize bills along a longitudinal axis for accurate validation.
Innovation Solution
A simplified centering device with a pair of pinch jaws and a centering motor that moves the jaws toward and away from each other to align the bill's central line with the passageway, using a stepping or servo-motor to handle varying warpage resistance, reducing the number of structural components and maintaining reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex centering device with numerous structural components is used, then reliable centering operation can be achieved, but device complexity and maintenance requirements increase
Solution Approach 1:
The patent removes the clutch mechanism from the centering device, extracting the unnecessary component that caused complexity. The centering motor directly drives the pinch jaws through a gear mechanism, eliminating the need for a separate clutch assembly while maintaining reliable operation through the motor's inherent torque control capabilities
Solution Approach 2:
The centering motor serves multiple functions: it provides continuous rotation for conveying bills and simultaneously provides controlled reciprocating motion for centering operations through the gear mechanism. This multi-functionality eliminates the need for separate clutch mechanisms to switch between different operational modes
2Device complexity
If a simplified centering device with fewer components is used, then device complexity is reduced, but maintaining reliable operation becomes difficult
Solution Approach 1:
The patent incorporates a sensor that detects the position of the pinch jaws and provides feedback to the control device. This feedback mechanism ensures reliable operation by allowing the system to monitor and adjust the centering process, confirming when bills are properly centered without requiring complex mechanical structures
Solution Approach 2:
The centering motor with inherent holding torque automatically maintains the positioned state of the pinch jaws without requiring additional locking mechanisms or complex control systems. The motor's self-holding capability ensures reliable operation while keeping the structure simple
3Device complexity
If a centering motor with inherent holding torque is used, then device structure is simplified, but the motor must stall when warpage resistance exceeds holding torque
Solution Approach 1:
The centering motor operates in periodic cycles: rotating to bring pinch jaws into contact with the bill, reciprocating to apply centering force, and pausing when the bill is properly centered or when warpage resistance exceeds holding torque. This periodic operation allows the motor to stall temporarily without affecting overall system functionality, as the stalling condition itself signals completion of the centering action
Solution Approach 2:
The patent converts the potential harm of motor stalling into a beneficial indicator. When the motor stalls due to warpage resistance exceeding holding torque, this stalling condition signals that the bill has been successfully centered or that maximum centering force has been applied. The control device interprets this stalling as a positive outcome rather than a failure condition
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 provides a lightweight, reliable, and simplified centering mechanism that effectively centralizes bills of different widths, reducing maintenance needs and ensuring accurate validation without the need for additional clutch mechanisms.
Implementation Method 1
a centering motor (30) for moving the pinch jaws (15) toward and away from each other for reciprocation of the pinch jaws (15) so that the pinch jaws (15) come into contact with side edges of the bill
Implementation Method 2
the centering motor (30) is a stepping motor which can arrive at a power-swing damping when the warpage resistance of the bill is greater than the inherent holding torque of the centering motor (30)
Implementation Method 3
The roller device (10) comprises rollers (40 to 42) in contact to the belts (9, 11, 12)... The front and side rollers (40, 41, 42) of the roller device (10) are rotated respectively under contact to the front and side belts (9, 11, 12) to inwardly transport the bill
Data Source
AI summary
Centering device 14 of a bill validator comprises a pair of pinch jaws 15 positioned on the opposite sides of a passageway 6, and a centering motor 30 for moving pinch jaws 15 toward and away from each other for reciprocation of pinch jaws 15 so that pinch jaws 15 come into contact with side edges of a bill between pinch jaws 15 to align a central line of bill with a central line of passageway 6. As centering motor 30 stalls when warpage resistance by centered bill is greater than inherent holding torque of centering motor 30, centering device 14 has the simplified structure with reduced number of structural components for light weight and reliable centering operation.