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Figs. 1 And 2 Illustrate a One Piece Brake And Tensioning Device for a Thin Flexible Film Contained Within a Housing.. April 1986
English (United States)
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Figs. 1 And 2 Illustrate a One Piece Brake And Tensioning Device for a Thin
Flexible Film Contained Within a Housing.. April 1986
The path of the film 1 is from a supply spool (not shown) between a back-up
post 2 and flexible member 5 which is anchored in a housing. The film path
continues around a free-to-pivot roller 3, around guide roller 4, and then exits the
housing which is not shown. Film is taken up by an over-driven friction drive
take-up spool which is not shown as film 1 is pulled by the take-up spool. The
member 5 will flex first in the small cross- sectional area 6, but remain pinched at
the back-up post 2. When the film tension reaches a specified amount which
surpasses the flex strength of area 7, the film 1 is released to be taken up by the
driven take-up spool. When film is not being taken up, film tension drops, flexible
member 5 pinches film 1 against stop post 2 immediately, as thin area 6 takes up
all developed slack in the film. The take-up spool will always see the same
resistive force from the film. The size of the supply spool will have no bearing on
the amount of force needed to peel off the film since the stop will hold the film
until a certain film tension is reached.