Tractor-feed unit

Details Tractor-feed unit Tractor-feed unit

1997-10-08

1999-03-30

Burr, Edgar

Typewriting machines

Sheet or web

For feeding web record-medium

400611, B41J 1126

Patent

active

058879986

ABSTRACT:
The tractor-feed unit has a pair of first and a pair of second rollers rotatably supported by frame members. A pair of endless tractor belts are wound around the first and second pair of rollers. The tractor belt has protrusions, with which sprocket holes formed in a continuous sheet are engaged. A central portion of each of the frame members is bent to form a guide member, which is engaged with an upper and peripheral edge of a tractor belt, so that a tractor belt is deflected downward. Thus, the protrusions are separated from the sprocket holes to a position, corresponding to a guide member, below the continuous sheet.

REFERENCES:
patent: 4890140 (1989-12-01), Negoro et al.
patent: 4987448 (1991-01-01), Chikama et al.
patent: 5018887 (1991-05-01), McCray et al.
patent: 5061967 (1991-10-01), Isobe et al.
patent: 5354139 (1994-10-01), Barrus et al.
patent: 5515149 (1996-05-01), Ishikawa et al.
patent: 5718527 (1998-02-01), Fujimoto et al.
Darwin et al., "Bidirectional Printer Carriage", IBM Technical Disclosure Bulletin, vol. 15, No. 1, Jun. 1972, p. 157.

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