Web guiding and centering apparatus

Advancing material of indeterminate length – With material-responsive control means – To position material laterally

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Details

26 97, 226180, 226187, B65H 2526

Patent

active

040078655

ABSTRACT:
A web guiding and centering apparatus for guiding and centering a moving web of substantially constant width relative to a fixed center line includes two guiding devices positioned equally distant from the selected center line, each guiding device comprising a pair of co-acting guide rolls inclined in the direction of travel of the moving web for engaging an edge portion of the web on opposite faces thereof. One guide roll of each pair is pivotally and resiliently biased toward the other roll of the same pair about a pivot which is outboard of the web. At least one roll of each pair has a composite surface which includes an outboard surface portion of relatively hard, low coefficient of friction material and an inboard surface portion of a relatively soft, high coefficient of friction material. The inclined relationship of the co-acting rolls of each pair relative to the direction of travel of the web, the biased, pivotal relationship of the co-acting rolls relative to each other, and the difference in relative hardness and coefficient of friction of the inboard and outboard surface portions of at least one roll of each pair of rolls result in cyclical action between the rolls and web which causes the opposite edges of the web to be guided substantially uniformly with respect to a selected fixed center line. A modification of each guiding device includes a recessed area, or alternatively a bump on one roll face for augmenting the response of the guide rolls.

REFERENCES:
patent: 1919291 (1933-07-01), Coolidge
patent: 2047212 (1936-07-01), Lovell
patent: 2451343 (1948-10-01), Kunzle

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