Dual Dancer Mechanisms for Uniform Web Tension
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Solution Overview
Problem
Existing methods struggle to maintain a constant web tension over a portion of the web path, particularly in head printing devices like inkjet printing devices, leading to potential product defects and waste.
Innovation Solution
A method involving dancer mechanisms with actuators to control the tension of a continuous web by generating forces that maintain equal tension at specific locations along the web path, ensuring constant tension over the desired portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If rollers advance the web along the path, then the web is moved through the processing path, but the tension of the web varies leading to manipulation issues
Solution Approach 1:
The patent employs feedback control through dancer mechanisms that continuously monitor web tension and adjust roller positions accordingly. The dancer mechanisms provide real-time feedback on tension variations, enabling the control system to compensate and maintain constant tension throughout the web path, thereby resolving the contradiction between web movement and tension control precision.
Solution Approach 2:
The patent uses dynamic dancer mechanisms that can actively adjust their position and apply variable forces to the web. These mechanisms transition from static to dynamic control, allowing the system to adapt to changing tension conditions during web movement and maintain constant tension despite speed variations or external disturbances.
2Ease of operation
If tension is controlled at single locations, then local tension is managed, but tension remains non-uniform across the web path causing defects
Solution Approach 1:
The patent divides the web path into multiple segments with separate dancer mechanisms positioned at different locations. Each dancer mechanism independently controls tension in its local segment, and through coordinated control, achieves uniform tension across the entire web path. This segmentation approach maintains operational simplicity while improving overall tension uniformity.
Solution Approach 2:
The patent extends tension control from a single-point approach to a multi-dimensional approach by positioning dancer mechanisms at multiple locations along the web path. This spatial distribution creates a two-dimensional control landscape, allowing simultaneous management of tension at various points to achieve overall uniformity while maintaining manageable control complexity.
Data Source
AI summary
A method for controlling a tension of a continuous web comprises: moving said web along a web path; controlling a first actuator of a first dancer mechanism to generate a first force to move first rollers of said first dancer mechanism along a respective first path on a respective first surface, said first rollers contacting said web at a first portion of said web path; and controlling a second actuator of a second dancer mechanism to generate a second force to move second rollers of said second dancer mechanism along a respective second path on a respective second surface, said second rollers contacting said web at a second portion of said web path, said second portion being separate from said first portion. Said first force and second force are determined so that the tension of said web is substantially equal near said first portion and near said second portion.