Nonlinear Web Applicator Guide Roller Control
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Solution Overview
Problem
Existing methods for bonding leg elastics to a moving base web at high line speeds are limited by the amplitude of displacement, leading to straight or relatively straight leg elastics, and face challenges in manufacturing reliability and efficiency, with issues such as elastic web breaking and inaccurate placement.
Innovation Solution
An apparatus with a pivot motor and guide rollers, including a cantilever arm and guide motor, allows for the precise guidance and application of a first web in a nonlinear pattern to a base web, enabling greater amplitude and reliability at higher line speeds by controlling the cross-directional and pivotal movement of guide rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the guide roller is pivotally mounted to allow self-adjustment based on web force, then the apparatus is simpler and easier to operate, but the manufacturing precision and reliability deteriorate at high line speeds due to web breaking and placement inaccuracies
Solution Approach 1:
The patent replaces the purely mechanical self-adjusting guide roller system with an automated control system that uses sensors to detect web position and a controller to calculate and command guide roller positioning, substituting mechanical feedback with electronic sensing and control
Solution Approach 2:
The patent implements a feedback control system where sensors continuously monitor the position of the web, the controller processes this information to determine required adjustments, and the guide roller positioning system responds by adjusting its position to maintain accurate web placement
2Productivity
If the angular acceleration of the guide roller is increased to achieve greater amplitude patterns at high line speeds, then the productivity and pattern amplitude improve, but the reliability deteriorates due to increased web breaking and placement lag
Solution Approach 1:
The feedback control system continuously monitors web position and guide roller position, allowing the system to maintain reliable operation at high line speeds by making real-time adjustments based on actual position data rather than relying on mechanical inertia
Solution Approach 2:
The patent replaces the mechanical self-adjusting mechanism with an electronically controlled positioning system that can achieve precise placement at high speeds without relying on mechanical momentum, thereby improving reliability
3Shape
If the amplitude of the nonlinear pattern is increased to improve leakage protection and aesthetic appearance, then the product quality improves, but the device complexity increases to achieve greater displacement control
Solution Approach 1:
The controller serves multiple functions: it receives sensor data, calculates required guide roller positions, commands positioning actuators, and coordinates with the web delivery system, consolidating multiple control functions into a single integrated device
Solution Approach 2:
The patent replaces complex mechanical linkages and physical adjustment mechanisms with an electronically controlled positioning system that achieves large pattern amplitudes through coordinated electronic commands to the guide roller, reducing mechanical complexity
Data Source
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AI summary
An applicator for and method of guiding a first web to a base web in a nonlinear pattern as the base web is advanced in a machine direction are disclosed. The applicator can include a support structure, a cantilever arm, a guide roller, and a connecting link. The cantilever arm can be supported by the support structure and moveable through a range of motion relative to the support structure in a cross machine direction. The guide roller can guide the first web onto the base web and can be pivotally mounted on the cantilever arm for pivotal movement of the guide roller with respect to the cantilever arm. The connecting link can be operatively coupled to the guide roller. Pivotal movement of the guide roller can be dependent on movement of the connecting link. Positioning of the guide roller in the cross machine direction can be dependent on movement of the cantilever arm.