Printer Roller Speed Synchronization for Paper Deformation
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Solution Overview
Problem
Existing printing apparatuses face issues with paper deformation and loud noises due to differential speeds between roller units during paper discharge, particularly in double-side printing modes, where precise timing control of speed reduction is challenging.
Innovation Solution
A printing apparatus with a paper discharge roller unit and transportation roller unit, where sensors detect the print sheet's position and length to adjust speeds independently, ensuring smooth transition and preventing deformation and noise by maintaining appropriate speed synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the paper discharge roller unit is slowed down to prevent rough stacking, then the sheets are neatly arranged, but the print sheet becomes warped and deformed due to differential speed between roller units
Solution Approach 1:
The paper discharge roller unit dynamically adjusts its rotation speed based on the detected transportation speed. The control unit calculates the optimal discharge speed by considering the transportation speed, sheet length, and distances between roller units, allowing the discharge roller to rotate at a speed that prevents both rough stacking and sheet deformation.
Solution Approach 2:
The system changes the rotational speed parameter of the paper discharge roller unit from a fixed value to a variable value that adapts to different transportation speeds. This parameter change enables the discharge roller to match the incoming sheet speed while maintaining appropriate discharge speed for neat stacking.
2Manufacturing precision
If the paper discharge roller unit is slowed down, then the sheets are neatly arranged, but a loud hitting sound is caused when the print sheet contacts the roller
Solution Approach 1:
The system dynamically changes the rotational speed parameter of the paper discharge roller to match the transportation speed of the incoming sheet. This speed synchronization prevents the sheet from hitting the roller with excessive force, thereby reducing loud hitting sounds while still achieving neat stacking.
3Reliability
If the transportation speed is restricted for double-side printing, then the sheet can circulate properly, but the timing control of speed reduction becomes complex and difficult
Solution Approach 1:
The system uses a sensor to detect the leading edge of the print sheet and provides feedback to the control unit. Based on this feedback and the predetermined parameters (sheet length, distances between rollers), the control unit automatically calculates and adjusts the discharge roller speed, simplifying the control complexity while ensuring reliable double-side printing operation.
Data Source
AI summary
A printing apparatus comprises: a first paper discharge roller unit 411 and a second paper discharge roller unit 412 which are configured to transport a print sheet to a discharge port; a upper transportation roller unit 401 configured to transport the print sheet to the first paper discharge roller unit 411; a drive control unit 302 configured to determine a transportation speed; an upper side paper discharge drive unit 270 configured to drive both the paper discharge roller units at the determined transportation speed after starting transportation of the print sheet until the print sheet leaves the upper transportation roller unit 401, and drive both the paper discharge roller units at a discharge speed which is determined independently from the transportation speed until the print sheet leaves the second paper discharge roller unit 412.