Strap dispenser for automatic strapping machine

Details Strap dispenser for automatic strapping machine Strap dispenser for automatic strapping machine

1975-04-16

1976-06-15

McCarthy, Edward J.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

242 54R, 2421562, B65H 2522, B65H 7500

Patent

active

039631915

ABSTRACT:
A strap dispenser for a strapping machine includes a dancer arm connected to a double acting pneumatic cylinder assembly wherein the piston has a rod end and a larger area piston end. Air under the same pressure is applied to both ends before strap feeding begins and during the time that the strapping machine is reversed to withdraw strap from the machine. The resultant differential pressure retracts the dancer arm with the assistance of a relatively weak spring. During strap feeding both ends of the cylinder are exhausted, the piston end exhausting through an adjustable throttle valve. This provides a passive resistance to advance of the dancer arm as the strap reel is being accelerated during the strap feeding operation.

REFERENCES:
patent: 2905406 (1959-09-01), Pedersen
patent: 3081957 (1963-03-01), Van de Bilt
patent: 3337153 (1967-08-01), Hamlin
patent: 3602452 (1971-08-01), Sauer
patent: 3688999 (1972-09-01), Plattner
patent: 3717313 (1973-02-01), Williams
patent: 3759169 (1973-09-01), Goodley

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