Vacuum Shuttle for Sheet Registration Correction
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Solution Overview
Problem
Current registration systems face challenges in accurately aligning large sheets and high-speed printing, often resulting in sheet damage or mis-registration due to increased stresses and limitations in correction time, especially when handling larger sheets or varying sheet-to-sheet errors.
Innovation Solution
A vacuum-assisted sheet registration system with a controllable vacuum shuttle that applies suction and uses actuators for lateral translation and rotational movement, guided by a feedback system to correct skew and lateral offset in real-time, allowing for simultaneous correction of registration errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If registration correction algorithms are used to steer sheets with large input errors, then registration accuracy may be improved, but sheet trailing edges may be driven into sidewalls causing damage or jams
Solution Approach 1:
The system dynamically adjusts the registration correction process based on real-time sheet position detection. The vacuum shuttle head applies suction to hold the sheet while actuators make incremental adjustments to lateral and skew position, allowing the sheet to be gradually steered to the target position without sudden movements that would cause damage.
Solution Approach 2:
The system uses sensors to detect the actual position of the sheet trailing edge and feeds this information back to the control system. Based on this feedback, the control system calculates the necessary correction and actuates the vacuum shuttle head to make precise adjustments, ensuring the sheet reaches the target position without exceeding physical limits.
2Productivity
If sheets are steered at high speeds, then productivity is improved, but the time available for registration correction is reduced increasing stresses on sheets
Solution Approach 1:
The system performs preliminary registration correction by applying vacuum suction to the sheet before the high-speed printing process begins. The vacuum shuttle head positions the sheet correctly in advance, so that when the sheet enters the high-speed printing zone, it is already properly aligned, reducing the time needed for correction during high-speed operation.
Solution Approach 2:
The vacuum shuttle head acts as an intermediary device between the sheet feeder and the high-speed printing system. It provides a controlled environment with vacuum suction that allows for gentle handling and precise positioning of the sheet before it enters the high-speed printing zone, reducing stresses during the transition.
3Adaptability or versatility
If a translating carriage is used for lateral correction, then lateral and skew correction can be decoupled, but the maximum speed of the printer system is limited by carriage return time
Solution Approach 1:
The registration correction function is segmented into independent lateral translation and rotational skew correction capabilities. The vacuum shuttle head can translate laterally to correct lateral offset while maintaining vacuum suction, and separately rotate to correct skew, allowing these corrections to be decoupled and performed independently without limiting overall system speed.
Solution Approach 2:
The system replaces the traditional mechanical translating carriage with a vacuum-assisted shuttle head that uses suction to hold the sheet while actuators perform lateral and rotational adjustments. This substitution eliminates the need for heavy mechanical carriage movement, significantly reducing return time and enabling higher printing speeds while maintaining decoupled correction capabilities.
4Manufacturing precision
If manual alignment procedures are performed to reduce input error, then mean input error may be reduced, but sheet-to-sheet variations still result in mis-registration
Solution Approach 1:
The system uses sensors to detect the actual position of each sheet's trailing edge and feeds this information back to the control system. Based on this feedback, the control system calculates the necessary correction for each individual sheet, ensuring consistent registration across all sheets despite variations in input error. This closed-loop approach addresses sheet-to-sheet variations that manual alignment cannot handle.
Solution Approach 2:
The system automatically performs registration correction for each sheet based on detected position, eliminating the need for manual alignment procedures. The vacuum shuttle head self-adjusts the lateral and skew position of each sheet according to real-time feedback, providing consistent registration without requiring operator intervention for each sheet.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces registration errors to within tighter tolerances, minimizes stress on sheets, and accommodates larger sheet sizes and weights, enabling faster and more precise alignment without the need for manual adjustments, thus improving printing system efficiency.
Implementation Method 1
A vacuum shuttle includes a vacuum head, which applies suction to the sheet
Data Source
AI summary
A sheet registration system includes a transport member on which a sheet is conveyed in a process direction, a vacuum shuttle, and a feedback system. The vacuum shuttle includes a vacuum head which applies suction to the sheet and actuators for rotating the vacuum head in a plane parallel to a plane of the transport member and translating the vacuum head in a cross-process direction. In response to feedback instructions generated by the feedback system, the actuators move the vacuum head, relative to the transport member, while the vacuum is applied to the sheet. The sheet registration system is suitable for use in a printer for reducing skew and lateral offset of sheets of print media.