Device for controlling the unwinding of a plastics film in a pac

Details Device for controlling the unwinding of a plastics film in a pac Device for controlling the unwinding of a plastics film in a pac

1986-06-18

1987-09-15

Coan, James F.

Package making

Means to feed cover material

Continuous web cover material

53 64, 83236, B65B 4112

Patent

active

046930531

ABSTRACT:
The invention relates to a device for controlling the unwinding of a plastic film in a packaging machine. The film before coming in contact with a conveyor belt for the products to be packaged passes in succession through a pair of dragging rollers and about a floating bar disposed between fixed guide rollers. The drive roller of the pair of rollers is driven by a variable speed motor by way of two alternately activated transmission of different ratio. Two microswitches disposed at different levels cooperate with the floating bar in order to activate one or the other of the transmissions.

REFERENCES:
patent: 2636731 (1953-04-01), Howard
patent: 2718738 (1955-09-01), Mast et al.
patent: 2813798 (1957-11-01), Toby
patent: 3084491 (1963-04-01), Solomon
patent: 3504586 (1970-04-01), Acquaviva, Jr.

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