Paper Rewinder Diameter Control via Optical Feedback
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Solution Overview
Problem
Existing paper log rewinding processes face challenges in maintaining consistent log diameter due to surface wear of winding rollers and debris, leading to inaccuracies in log growth and quality.
Innovation Solution
A control system that uses an optical vision system with edge-detection algorithms to measure the actual diameter of logs and automatically adjust the speed of winding rollers based on comparisons with predetermined values, ensuring consistent log growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual control of winding roller speed is used, then operator experience can adjust for surface wear and debris, but control consistency deteriorates over time and varies between operators
Solution Approach 1:
The patent implements an automated feedback control system where an optical sensor continuously measures the actual diameter of the log, compares it with the target diameter, and automatically adjusts the winding roller speeds based on the detected deviation. This closed-loop feedback mechanism eliminates manual intervention variability and maintains consistent control accuracy over time, directly resolving the contradiction between measurement precision and control reliability.
2Reliability
If automated optical measurement system is implemented, then control consistency is maintained over time, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical measurement and adjustment mechanisms with an optical measurement system and automated control algorithm. The optical sensor non-contactingly measures log diameter, and the control system automatically calculates and adjusts roller speeds, eliminating the need for complex mechanical gauges, manual measurement devices, and mechanical adjustment mechanisms, thus achieving reliable automated control with reduced mechanical complexity.
3Device complexity
If winding roller speed is not adjusted for surface wear, then device complexity remains low, but manufacturing precision of log diameter deteriorates
Solution Approach 1:
The patent implements a self-adjusting control system where the winding rollers automatically compensate for their own surface wear and debris accumulation. The optical measurement system continuously monitors log diameter, detects deviations caused by roller surface conditions, and the control algorithm automatically adjusts roller speeds to maintain precision without requiring external intervention or complex manual adjustment procedures, achieving manufacturing precision through self-service automation.
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 provides a constant and reliable control over the rewinding process, independent of operator experience, using commercially available optical devices at a low cost, and maintains log quality by compensating for diameter errors.
Implementation Method 1
an optical vision system with edge-detection algorithms to measure the actual diameter of logs
Implementation Method 2
automatically adjust the speed of the winding rollers based on comparisons with predetermined values, ensuring consistent log growth
Data Source
AI summary
Rewinder for producing paper logs, comprising a winding station with a first winding roller, a second winding roller and a third winding roller driven by corresponding electric motors, including a detection system capable to detect a succession of diameters of the log being formed in the winding station and a programmable electronic unit connected to the electric motors. The system compares the measured diameters with a succession of corresponding diameters of predetermined value and to calculate a sequence of differences between these values. The electronic unit determines a parameter (a) related to the trend over time of the values. The electronic unit changes the relative speed of the first and second roll depending on the value of the parameter.