Paper Feeder Speed Control for Registration Alignment
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Solution Overview
Problem
In paper feeding operations, the leading end of a subsequent paper sheet may reach the registration rollers before they are stopped, leading to poor print quality and wrinkles due to uncorrected inclination, especially with reduced inter-sheet distances in continuous printing.
Innovation Solution
A paper feeder system with a detection unit and controller that controls the paper feed and registration rollers to set a lower conveyance speed for the paper feed roller when the leading end is detected, preventing the subsequent sheet from reaching the registration rollers before they stop, and includes mechanisms to suspend the paper feed roller in cases of overlap or short inter-sheet distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the paper feed roller continuously feeds sheets at high speed to improve productivity, then productivity is improved, but the leading end of the subsequent sheet may reach the registration rollers before they stop, causing passing through and poor print quality
Solution Approach 1:
The detection unit detects the leading end of the subsequent sheet in advance before it reaches the registration rollers. The controller receives this detection signal and preliminarily controls the paper feed roller to stop or reduce speed, preventing the sheet from passing through the stopped registration rollers. This preliminary detection and control action ensures print quality is maintained even during high-speed continuous printing.
2Productivity
If the inter-sheet distance is reduced to improve productivity in continuous printing, then productivity is improved, but the sheet is more likely to pass through the registration rollers
Solution Approach 1:
The detection unit continuously monitors the position of the leading end of each sheet and provides feedback signals to the controller. Based on this feedback, the controller dynamically adjusts the paper feed roller's operation timing and speed. When the detection unit detects the leading end of a subsequent sheet, it sends a signal to the controller, which then controls the paper feed roller to stop or reduce speed before the sheet reaches the registration rollers, preventing passing through even with reduced inter-sheet distances.
3Manufacturing precision
If the paper feed roller stops after conveying a specified distance to ensure proper sheet positioning, then manufacturing precision is improved, but the subsequent sheet may be conveyed beyond its proper position due to duplicate feed
Solution Approach 1:
The detection unit detects the leading end of each sheet and provides real-time feedback to the controller. The controller uses this feedback to precisely control the paper feed roller's stopping position. When the detection unit detects the leading end of the subsequent sheet, the controller stops the paper feed roller at the appropriate timing, preventing duplicate feed and ensuring each sheet is positioned accurately without requiring complex manual intervention.
Data Source
AI summary
Upon continuous feeding of a plurality of sheets and upon detection of a leading end of a sheet by a detection unit before an elapse of a first time after a start of a paper feed roller, a controller performs control such that a paper conveyance speed of the paper feed roller is set lower than a paper conveyance speed of a registration roller, and the paper feed roller is stopped after conveying the sheet having the leading end detected for a specified conveyance distance before a next timing of starting the registration roller.