Printer Feeder Shaft Rotation Control for Platen Deformation
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Solution Overview
Problem
Existing printing devices do not account for platen deformation during use, leading to potential deterioration in print quality due to irregular paper feeding.
Innovation Solution
A printing device with a detection unit that monitors the rotation of a shaft and a control unit that adjusts the feeder motor to account for platen deformation by rotating the shaft in the first direction before printing, ensuring consistent paper feeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the platen is spaced apart from the head during non-use to prevent platen deformation, then the platen deformation during non-use is reduced, but the platen deformation during use increases leading to deterioration in print quality
Solution Approach 1:
The control unit performs preliminary rotation of the shaft in the first direction before printing starts. This preliminary action pre-loads the platen roller to counteract the deformation that would otherwise occur during printing, ensuring the platen maintains its proper shape and positioning during the actual printing process, thus resolving the contradiction between non-use deformation prevention and print quality
2Productivity
If the shaft is stopped after rotating in the first direction, then the paper feeding stops, but the platen deformation during subsequent printing causes paper jamming and crushing
Solution Approach 1:
The control unit rotates the shaft in the first direction before printing to pre-deform the platen roller in a controlled manner. This preliminary deformation ensures that when printing starts, the platen is already in the optimal state for paper feeding, preventing paper jamming and crushing while maintaining reliable paper feeding throughout the printing process
3Device complexity
If no detection unit is used to monitor shaft rotation, then the device complexity is reduced, but the control accuracy for compensating platen deformation is insufficient
Solution Approach 1:
The detection unit continuously monitors the rotation of the shaft and provides feedback to the control unit. This feedback mechanism enables the control unit to accurately track the shaft's rotational position and make precise adjustments to compensate for platen deformation, ensuring accurate paper feeding control while maintaining a relatively simple overall system architecture
Data Source
AI summary
A printing device includes: a printing unit printing on a recording paper; a feeder unit that has a roller rotating in a first direction about a shaft and feeding the recording paper, and a motor rotating the shaft; a detection unit detecting a rotation of the shaft in the first direction and a rotation thereof in a second direction opposite to the first direction; and a control unit controlling the feeder unit, based on the rotation of the shaft detected by the detection unit. The control unit causes the motor of the feeder unit to rotate the shaft in the first direction and then stop the shaft, and subsequently causes the motor to rotate the shaft in the first direction before the printing unit prints, based on the rotation of the shaft in the second direction detected by the detection unit.