Forms feed tractor for a printer

Details Forms feed tractor for a printer Forms feed tractor for a printer

1989-01-27

1992-08-04

Stodola, Daniel P.

Advancing material of indeterminate length

Means to engage longitudinally spaced modifications in material

Pins on flexible belt or chain

4006161, B65H 2020

Patent

active

051351480

ABSTRACT:
A tractor mechanism has an endless pin belt entrained around spaced drive and idler sprockets mounted between a pair of frame members. The idler sprocket is supported by a carrier movable longitudinally by springs to apply tension to the belt. The edges of the belt overhang gear teeth of the belt and are prevented from contact with the frame members by the gear teeth engaging an endless vertical wall on one of the frame members. The frame members and sprocket carrier are molded polycarbonate with carbon fiber and solid lubricant fillers to reduce electrostatic charge buildup and wear of the belt. The frame members are bolted together to clamp the sprocket carrier in place to maintain the belt tension applied by the springs. The sprocket carrier and frame members have aligned elongate openings for receiving a tractor guide shaft with a concentric plastic tube, the latter being attached to a retainer plate held loosely between the sprocket carrier and a frame member.

REFERENCES:
patent: 4226353 (1980-10-01), Blaskovic et al.
patent: 4421261 (1983-12-01), Hubbard
patent: 4765523 (1988-08-01), Ferguson
patent: 4790467 (1988-12-01), Rex et al.
patent: 4805822 (1989-02-01), Milano, Jr.

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