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Splicing a Moving Web

IP.com Disclosure Number: IPCOM000090640D
Original Publication Date: 1969-Jun-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Tsui, F: AUTHOR

Abstract

The end of a moving web is exposed before the web is completely unwound from a reel, thus enabling it to be joined to another web while still being unwound. Adjacent one end 11, web 12 is doubled back on itself to form a bight or loop 13 that is inserted into cavity 14 in mandrel 15. The resultant short and long lengths 16 and 17 of web 12 are then wound clockwise around 15 in unison as a double ply until end 11 is reached and wrapped under 17. Then Web 12 is wrapped as single ply 17. When web 12 is later unwound by being withdrawn in the direction of arrow 18, end 11 eventually becomes exposed and, as length 17 continues to be withdrawn, end 11 can be spliced to a new web not shown. The length of 16 is a function of the unwind speed of web 12 and splicing them.

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Splicing a Moving Web

The end of a moving web is exposed before the web is completely unwound from a reel, thus enabling it to be joined to another web while still being unwound. Adjacent one end 11, web 12 is doubled back on itself to form a bight or loop 13 that is inserted into cavity 14 in mandrel 15. The resultant short and long lengths 16 and 17 of web 12 are then wound clockwise around 15 in unison as a double ply until end 11 is reached and wrapped under 17. Then Web 12 is wrapped as single ply 17. When web 12 is later unwound by being withdrawn in the direction of arrow 18, end 11 eventually becomes exposed and, as length 17 continues to be withdrawn, end 11 can be spliced to a new web not shown. The length of 16 is a function of the unwind speed of web 12 and splicing them. S- shaped surface 19, which defines cavity 14, has radii of curvature r and R which are almost identical and which are sufficient to avoid permanent deformation of the particular web material beyond its elastic limit. By making the distance x across the cavity mouth somewhat less than 2R, loop 13 flexes and expands and is spring-clamped within cavity 14. To facilitate detachment from mandrel 15, end 11 is preferably weighted or reinforced.

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