Sheet Feeder Sensor System for Position Deviation Correction
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Solution Overview
Problem
Sheet processing machines face errors due to unknown sheet positions and dimensions in piles, leading to issues like skew, early, or late sheets, which can disrupt the printing process and require manual intervention.
Innovation Solution
A sensor system with distance sensors on both sides of the sheet pile, transversely spaced to the transport direction, monitors and evaluates sheet positions and dimensions, allowing for early detection of deviations and automated correction before sheets enter the processing machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sheets are fed from a pile with unknown positions and dimensions, then the feeding process can proceed continuously, but errors such as skew sheets, early or late sheets, and double sheets occur
Solution Approach 1:
The patent applies preliminary action by measuring the position and dimensions of sheets in the pile before they are fed into the processing machine. Distance sensors detect sheet parameters in advance, allowing the control system to prepare correction actions (such as adjusting feeder head position or selecting alternative sheets) before errors occur, thus maintaining continuous operation while ensuring accuracy.
Solution Approach 2:
The patent implements feedback by continuously monitoring sheet positions and dimensions using distance sensors during the feeding process. The control system receives real-time data about sheet variations and automatically adjusts feeding parameters or corrects positioning errors, enabling continuous productive operation while maintaining high reliability through closed-loop control.
2Reliability
If manual intervention is used to remove non-conforming sheets, then sheet positioning accuracy is maintained, but machine operation is interrupted and productivity decreases
Solution Approach 1:
The patent applies self-service by equipping the feeding system with automatic detection and correction capabilities. The control system autonomously identifies non-conforming sheets through sensor measurements and executes correction actions (such as adjusting feeder positioning or selecting alternative sheets) without requiring manual intervention, thus maintaining both high reliability and continuous productivity.
Solution Approach 2:
The patent replaces the manual mechanical intervention system with an automated sensor-based detection and control system. Distance sensors, control units, and automated feeder adjustments substitute for manual sheet removal, eliminating machine interruptions while maintaining positioning accuracy through electronic control rather than human operation.
3Measurement precision
If sensor systems are added to detect and correct sheet deviations, then sheet positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing a control system that performs multiple functions: it manages the feeding cycle, processes sensor data, detects various types of sheet errors (skew, early, late, double sheets), and executes different correction strategies. This multi-functional approach consolidates what could be multiple separate systems into a single integrated control unit, reducing overall device complexity while maintaining high measurement precision.
4Adaptability or versatility
If sheets with tolerances of more than 1 mm in cut lengths are processed, then manufacturing flexibility is maintained, but feeding errors increase
Solution Approach 1:
The patent applies dynamics by making the feeding system adaptive to varying sheet dimensions. The control system dynamically adjusts feeding parameters based on real-time measurements from distance sensors, accommodating sheet length tolerances of more than 1 mm. The system dynamically selects and executes appropriate correction strategies for different types of deviations, maintaining high feeding accuracy despite manufacturing variations.
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 enables early identification and correction of sheet position and dimension deviations, preventing errors and reducing the need for manual intervention by anticipating and adjusting the feeder head positioning and downstream units.
Implementation Method 1
a sensor system and connected evaluation means by which the sheet to be fed to the sheet treating or processing machine can be monitored with respect to criteria characterizing a position and/or dimension of the sheets and be evaluated with respect to a deviation from a target or target range
Data Source
AI summary
A feeder of a sheet treating or a sheet processing machine comprises a sensor system, which sensor system, on a front side pointing in a direction of transport of the sheets to be fed or on the opposing, rear side of the pile of sheets to be fed, comprises one or more sensors, by the use of which sensors, a distance, with respect to at least two locations, which are spaced apart from one another transversely to the transport direction, at the relevant front or rear sides of the pile, can be ascertained. A method is provided for detecting or correcting sheets having deviated positions or dimensions in such a sheet feeder of a sheet treating or processing machine.