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Exact Constraint: Machine Design Using Kinematic Principles
D. Blanding
D. Blanding
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ASME Press
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A web is generally defined to be a strip of flexible material whose width is much greater than its thickness and whose length is much greater than its width. Photographic film and paper are two examples. Such webs can be easily damaged if mishandled by conveyance machinery. Therefore, web conveyance machinery needs to be carefully designed to avoid overconstraint in the connection to the web. By achieving an exact constraint connection between the web and the web conveyance machinery, not only do we avoid damaging the web, but we can also achieve precision web tracking performance that would otherwise be impossible.

8.1 Web Types
8.2 A 2D Problem
8.3 Each Roller Is a Single Constraint
8.4 Edge Guides
8.5 Cambered Web
8.6 Necessary “Pivoting” of the Web on the Roller Surface
8.7 Connection Between Web and Roller: “Pinned” Versus “Clamped”
8.8 Hanged Rollers
8.9 Zero-Constraint Web Supports
8.10 Gimballing to Achieve a “Joint” in the Web Plane Diagram
8.11 Overhangs
8.12 Example: WPD Analysis of a Web Conveyance Apparatus
8.13 Two-Roller Belt Tracking
8.14 Crowned Rollers
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