Rotatable Web Spacing Device for Cross-Directional Alignment
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Solution Overview
Problem
Existing web spacing devices are inadequate for cross-directionally shifting waistband webs by a large degree, limiting their ability to produce absorbent articles of various sizes, as they are often configured for specific sizes and cannot shift webs far enough apart for proper alignment.
Innovation Solution
A web spacing device with a rotatable frame and two rotation members, allowing for adjustable cross-directional positioning of advancing webs by rotating the frame about different axes, enabling precise alignment and shifting of waistband webs for different sizes of absorbent articles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional web spacing device is used, then the web can be positioned at a predetermined size configuration, but the device cannot shift webs far enough apart for different sizes and requires separate devices for each size
Solution Approach 1:
The frame is made rotatable about a second axis of rotation, allowing it to dynamically change orientation between different size configurations. This dynamic adjustment enables a single device to handle multiple absorbent article sizes by rotating the frame to appropriate angles, eliminating the need for separate fixed devices for each size.
Solution Approach 2:
The web spacing device is designed with universal capability to accommodate different absorbent article sizes through the rotatable frame mechanism. The same device can be configured for various sizes by adjusting the frame rotation, making it a multi-functional tool that replaces multiple dedicated devices.
2Manufacturing precision
If the frame is rotatable about a second axis with greater angle, then cross-directional shifting capability is improved, but the device structure becomes more complex
Solution Approach 1:
The positioning function is segmented into two independent rotation operations: first rotation for fine positioning and second rotation for larger cross-directional shifts. This segmentation allows each rotation member to specialize in a specific angular range, achieving high overall positioning accuracy while maintaining manageable structural complexity through modular functional division.
Data Source
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AI summary
An apparatus may be used to control the cross-directional movement of a web advancing in a machine direction. The web defines a machine direction centerline. The apparatus may include a frame rotatable about a first axis of rotation and a guide member connected with the frame and configured to receive an advancing web. The apparatus may include a first rotation member connected with the frame and configured to rotate the frame by a first angle of rotation about the first axis of rotation to align a machine direction centerline of the advancing web with a target cross-directional position. The apparatus comprises a second rotation member connected with the frame and configured to rotate the frame about a second axis of rotation by a second angle of rotation to adjust the target cross-directional position, wherein the second angle of rotation is greater than the first angle of rotation.