Roll Paper Printer Curl Correction via Adaptive Transport Speed
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Solution Overview
Problem
Existing roll paper printers face challenges in achieving an appropriate transport speed while correcting paper curl, leading to suboptimal printing performance and potential paper jams.
Innovation Solution
A roll paper printer design that includes a third paper guide which can be attached or detached to contact the paper and correct curling, with a sensor detecting its presence to adjust the transport speed of the transport roller, allowing for adaptive speed adjustments based on curl severity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transport speed is increased to improve printing throughput, then productivity is improved, but the paper curl correction capability deteriorates
Solution Approach 1:
The patent applies dynamics by making the transport speed variable rather than fixed. The controller dynamically adjusts the transport speed based on real-time detection of paper thickness and curl conditions. When paper with strong curl is detected, the transport speed is reduced to allow adequate correction time; when thin paper with minimal curl is detected, the speed is increased to maximize throughput. This dynamic adaptation resolves the contradiction between productivity and curl correction reliability.
Solution Approach 2:
The patent implements feedback through sensors that continuously detect paper properties (thickness, curl degree) and feed this information back to the controller. The controller uses this feedback to adjust the transport speed in real-time. This closed-loop control system ensures that the transport speed is always appropriate for the current paper condition, maintaining both high productivity and reliable curl correction.
2Reliability
If the transport speed is decreased to improve paper curl correction, then paper transport stability is improved, but productivity deteriorates
Solution Approach 1:
The system dynamically adjusts transport speed based on actual paper conditions rather than using a fixed low speed. The controller monitors paper properties in real-time and adjusts the speed accordingly, ensuring stability only when necessary (when curl is detected) while maintaining high speed when paper conditions allow, thus resolving the contradiction between stability and productivity.
Solution Approach 2:
The patent changes the transport speed parameter adaptively based on detected paper characteristics. Instead of maintaining a constant conservative speed, the system varies the speed parameter within a range optimized for each specific paper condition, achieving both stability when needed and high productivity when possible.
3Device complexity
If a fixed transport speed is used to simplify control, then device complexity is reduced, but adaptability to different paper types deteriorates
Solution Approach 1:
The system employs self-service through automatic sensor-based detection and controller-driven speed adjustment. The sensors automatically detect paper properties and the controller automatically adjusts transport speed without requiring manual intervention or complex external control systems. This automation maintains relatively simple device architecture while achieving high adaptability to different paper types.
Solution Approach 2:
The patent replaces complex mechanical adjustment mechanisms with electronic sensing and control. Instead of using mechanical devices to physically adjust transport parameters for different paper types, the system uses electronic sensors to detect paper properties and electronic control to adjust motor speed, simplifying the overall device complexity while enhancing adaptability.
Data Source
AI summary
A roll paper printer includes: a case configured to accommodate a paper roll in which paper is wound in such a way that one surface of the paper faces outward; a transport roller that pulls the paper from the paper roll and transports the paper in a transport direction; a first paper guide configured to come into contact with the other surface of the paper upstream of the transport roller in the transport direction; a second paper guide that faces the first paper guide and is configured to come into contact with the one surface of the paper; a third paper guide configured to be attached/detached and configured to come into contact with the one surface of the paper and curve the paper upstream of the second paper guide in the transport direction; a sensor configured to detect the third paper guide; and a controller that decreases, when the third paper guide is detected by the sensor, a transport speed for the paper transported by the transport roller to be lower than that when the third paper guide is not detected.