Rotating Web Cutter Pad Anvil Attitude Change
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Solution Overview
Problem
Conventional web processing devices that cut and change the attitude of continuous webs using a single rotating unit face challenges where the web-cutting load shortens the pad's lifetime, and providing a separate anvil to prevent this load from affecting the pad hinders the attitude change of the pad.
Innovation Solution
A web processing device with a plurality of pads and anvils rotating around a single axis, where the cutter cuts the web with the anvil at a first relative level, and the pad changes its attitude by rotating, allowing the anvil to move to a second relative level without hindering the pad's rotation, enabling both web cutting and attitude change.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cutter receives the web from the pad and the anvil is integrated with the pad, then the web can be cut, but the web-cutting load acts upon the pad thus shortening the lifetime of the pad
Solution Approach 1:
The device is divided into separate functional components: the pad for carrying the web, the cutter for cutting, and the anvil for receiving the cutter. These components are arranged such that the anvil is positioned downstream of the pad in the rotation direction, allowing the cutter to receive the web from the pad and cut it against the anvil, thereby preventing cutting loads from acting on the pad and extending its lifetime.
2Duration of action of stationary object
If the anvil is provided separately from the pad to prevent web-cutting load from acting upon the pad, then the pad lifetime is extended, but the anvil may hinder the change of the attitude of the pad when the pad rotates
Solution Approach 1:
The anvil is positioned in the rotation direction (downstream) of the pad rather than adjacent to it radially. This spatial arrangement in the rotation direction allows the pad to rotate and change its attitude freely without the anvil interfering with the pad's motion, while still enabling the cutter to receive the web from the pad and cut it against the anvil.
3Device complexity
If a single rotating unit is used to cut and change the attitude of the web, then the device complexity is reduced, but the pad lifetime is shortened due to web-cutting load
Solution Approach 1:
The single rotating unit is segmented into distinct functional zones: the pad zone for carrying the web, the cutting zone with the cutter and anvil positioned downstream, and the attitude change zone. This segmentation within a single rotating unit allows the pad to be protected from cutting loads while maintaining device simplicity.
Solution Approach 2:
The cutting function is positioned downstream in the rotation direction rather than adjacent to the pad radially. This dimensional arrangement allows the pad to rotate freely for attitude change while the cutter receives the web from the pad and cuts it against the anvil, protecting the pad from cutting loads.
Data Source
AI summary
The present invention relates to a web processing device, comprising a plurality of pads Pi revolving around a axis X1, a cutter 30 for cutting a continuous web W, and a plurality of anvils Ai for receiving the cutter 30. The pads Pi receive the continuous web W, and the cutter 30 cuts the continuous web W into a cut-off web W2 together with the anvil Ai positioned at a first relative level L1. The pad Pi revolves around the axis X1 while changing an attitude of the pad Pi by turning about a line extending from the first axis toward the pad Pi, thereby carrying the cut-off web W2 while changing an attitude of the cut-off web W2. When the pad Pi changes its attitude, the anvil Ai relatively moves to a second relative level L2 so as not to hinder the pad Pi changing its attitude.