Feedforward Tension Control for Web Conveying Speed
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Solution Overview
Problem
Existing tension control devices in buffer systems experience delays in responsiveness when adjusting tension in response to changes in suction roller rotation speed, as the feedback control relies on sensor detection, leading to a lag in tension adjustments.
Innovation Solution
A tension control device with a movable air turn bar and a control unit that feedforward-controls the pressing force based on a schedule related to the web conveying speed, ensuring immediate adjustments to tension changes by anticipating changes in rotation speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback control based on sensor detection is used, then tension control is achieved, but responsiveness to speed changes is delayed
Solution Approach 1:
The control unit performs feedforward control by predicting the required pressing force based on the scheduled rotation speed of the suction roller. Instead of waiting for sensor detection of tension changes, the system proactively adjusts the turn bar pressing force according to pre-established speed-tension relationships, eliminating the time delay inherent in feedback-based systems.
2Measurement precision
If sensor-based feedback control is implemented, then tension detection is possible, but immediate tension adjustment cannot be achieved
Solution Approach 1:
The system combines feedforward control based on rotation speed scheduling with feedback control using tension sensors. The control unit receives both the scheduled speed information and actual tension detection, integrating both control strategies to achieve both immediate response and precise tension maintenance.
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 configuration improves the responsiveness of tension control by allowing for immediate adjustments to changes in web tension, reducing delays and maintaining uniform tension during changes in web conveying speed.
Implementation Method 1
a pressing member presses the web in a direction substantially normal to a conveying surface of the web
Data Source
AI summary
The present disclosure provides a tension control device including a turn bar which is disposed between an upstream device delivering a belt-shaped web and a downstream device receiving the web and of which a pressing member presses the web and a control unit which feedforward-controls a pressing force applied from the turn bar to the web on the basis of a schedule relating to a conveying speed of the web of any one of the upstream device and the downstream device.