Pocket Folding Machine Monitoring via Optical Control Marks
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Solution Overview
Problem
Existing folding machines face challenges in maintaining high production speed while ensuring quality, as current sensor-based quality monitoring systems are complex and costly, and do not adequately address folding deviations.
Innovation Solution
A method for monitoring the folding process in a pocket folding machine that involves using optical sensors to detect control marks on sheets, changing the transport direction, and adjusting folding units based on detected deviations to improve folding quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sensor-based quality monitoring systems are implemented to detect folding deviations, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the essential monitoring function by using a single optical sensor to detect control marks, rather than implementing complex multi-sensor systems. The sensor monitors folding quality by detecting the position and orientation of control marks on sheets, separating the critical quality parameter detection from unnecessary system complexity.
Solution Approach 2:
The optical sensor serves multiple functions: it detects the position of control marks, determines folding deviations, and provides feedback for correction. This multi-functional approach reduces the need for multiple specialized sensors and complex monitoring systems while maintaining comprehensive quality oversight.
2Measurement precision
If multiple control marks and multiple sensors are used to monitor folding quality, then measurement precision is improved, but device complexity increases
Solution Approach 1:
Instead of using multiple physical sensors, the patent uses a single sensor to read control marks that are printed copies of reference patterns on the sheets. These control marks contain encoded position and orientation information that allows the single sensor to measure multiple parameters with high precision without requiring multiple sensors.
Solution Approach 2:
The patent changes the measurement approach from direct physical measurement by multiple sensors to optical detection of printed control marks. The control marks encode position and orientation parameters in a visual format that can be read by a single optical sensor, transforming the measurement problem into an optical recognition task that reduces system complexity.
3Manufacturing precision
If real-time monitoring and correction of folding deviations is implemented, then manufacturing precision is improved, but productivity decreases due to additional processing time
Solution Approach 1:
The patent implements a feedback loop where the optical sensor continuously monitors the position of control marks on sheets passing through the folding machine. The system compares detected positions with reference values, identifies deviations, and triggers corrections only when necessary. This selective feedback approach maintains high precision while minimizing interruptions to production flow.
Solution Approach 2:
The control marks are pre-printed on the sheets before they enter the folding machine, and the system is pre-configured with reference values for correct positioning. This preliminary preparation allows for rapid real-time comparison and correction without requiring complex on-the-fly calculations or adjustments, maintaining high production speed while ensuring accuracy.
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
Enhances production efficiency and quality by refining sensor-based monitoring, allowing for real-time correction of folding deviations and improving the overall performance of folding machines.
Implementation Method 1
providing at least one optical sensor arranged on the second path, which has an optical detection area with a spatial extent at least in one direction perpendicular to the transport stop, and operating it in such a way that, for each sheet or for at least one selected sheet, a distance of at least the respective first control mark from a reference line is detected when passing the detection area
Data Source
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AI summary
A method according to the invention for monitoring a folding process in a pocket folding machine is a method comprising the following steps: providing a pocket folding machine (1) with a first pocket folding unit (3) and at least one further downstream folding unit (9); providing a stream (21) of sheets (20) to be folded, each with a printed first control mark (M1), which enter the first pocket folding unit (3) in an infeed direction (R1); folding the sheets (20) in the first pocket folding unit (3), whereby at least one first fold (25) is produced; transporting the sheets (20) as a stream on a first path (4) from the first pocket folding unit (3) in a first direction (R2) parallel to the infeed direction (R1) up to a transport stop (13) arranged substantially perpendicular to the first direction (R1); striking the sheets (20) against the transport stop (13) and thereby changing the transport direction;The invention transports the sheets (20) as a stream on a second path (6) in a second direction (R3) substantially parallel to the transport stop (13); and is characterized by the following steps: providing at least one optical sensor (30) arranged on the second path (6), which has an optical detection area (32) with a spatial extent at least in one direction perpendicular to the transport stop (13), and operating it such that, for each sheet (20) or for at least one selected sheet (20), a distance (A1) of at least the respective first control mark (M1) from a reference line (L1) is detected as it passes the detection area (32). The invention advantageously enables the production of folding machines to be increased while simultaneously improving their quality through sensor monitoring. The invention is used in industrial folding machines.