POS Printer Leading Edge Alignment via Sensor Feedback
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Solution Overview
Problem
Printers lack an automatic alignment mechanism for the leading edge of printable receipts, leading to waste due to excess unrolling and slippage issues, especially during cutting and unrolling processes.
Innovation Solution
A method and printer design that utilize sensors and motors to detect and adjust the position of the leading edge, providing backward and forward feed signals to align the receipt accurately, reducing waste and eliminating the need for manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the printer unrolls the printable receipt without verification of excess unrolling, then the printing process can start quickly, but a considerable quantity of printable receipts is wasted
Solution Approach 1:
The sensor detects the leading edge position of the printable receipt before the printing process starts, allowing the system to verify proper alignment in advance and prevent waste before it occurs
Solution Approach 2:
The sensor provides feedback about the receipt position to the control unit, which adjusts the unrolling process accordingly to ensure the leading edge is properly aligned before printing begins
2Adaptability or versatility
If the motor rotates vary depending on transaction history and receipt type, then the printer can adapt to different scenarios, but unwanted slippage and excess forward feed occur
Solution Approach 1:
The sensor continuously monitors the receipt position and provides feedback to the control unit, which adjusts motor rotation accordingly to maintain precise alignment despite varying transaction requirements
Solution Approach 2:
The system dynamically adjusts the motor rotation based on real-time sensor feedback about receipt position, allowing adaptation to different scenarios while maintaining precision
3Device complexity
If no automatic alignment mechanism is implemented, then the device complexity is low, but the leading edge of the receipt cannot be verified before printing
Solution Approach 1:
The system uses a simple sensor to automatically detect and verify receipt position without requiring complex manual alignment procedures or sophisticated mechanisms
Solution Approach 2:
The patent replaces complex mechanical alignment verification mechanisms with a simple sensor-based detection system that provides reliable positioning information
Data Source
AI summary
A method and a printer for aligning leading edge of a printable receipt to print position of a printer is described. The printer includes a sensor placed proximal to a cutter position. The sensor generates a first signal in response to a printable receipt blocking the sensor. Upon detection of first signal from the sensor, a backward feed signal is provided to a first motor until the first signal is stopped to roll the printable receipt into a print receipt roller. Further, a forward feed signal is provided to the first motor to unroll printable receipt from the print receipt roller until a second signal is received from the sensor on blocking by the printable receipt. Upon detection of the second signal, an automatic fixed backward feed signal is provided to the first motor to align the leading edge of the printable receipt in the print position thereby avoiding wastage of printable receipt.