Advancing material of indeterminate length – Means to engage longitudinally spaced modifications in material – Pins on flexible belt or chain
Patent
1980-05-27
1982-08-24
Gilreath, Stanley N.
Advancing material of indeterminate length
Means to engage longitudinally spaced modifications in material
Pins on flexible belt or chain
192 95, 226 4, 226 6, 226 75, 226108, 226188, B65H 1738
Patent
active
043457088
ABSTRACT:
A bi-directional feed mechanism for webs, especially for plotting and generating special characters, forms and shapes on the webs, uses twin pairs of tractors which feed a web around a loop which may contain a platen roller. Each pair of tractors is mounted on and driven by its own drive shaft. The drive shaft of one of the tractor pairs is driven from the drive shaft of the other tractor pair through a manually releasable clutch which may be mounted on, and movable along the axis of, the driven shaft. The tension in the loop may be adjusted by releasing the clutch so that one of the tractor pairs may be driven while the other is stationary. Webs and other documents which may vary in length and require tension adjustments may readily be fed by means of the mechanism. The arrangement of the tractors also enables the webs to be easily loaded from the top.
REFERENCES:
patent: 2457367 (1948-12-01), Hale
Gilreath Stanley N.
Lukacher Martin
P.H.D. of Puerto Rico, Inc.
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