Printer having tractor unit attachable to one of upstream and do

Details Printer having tractor unit attachable to one of upstream and do Printer having tractor unit attachable to one of upstream and do

1992-06-08

1993-02-02

Eickholt, Eugene H.

Typewriting machines

Sheet or web

For feeding web record-medium

226 74, B41J 1126

Patent

active

051833484

ABSTRACT:
To prevent concurrent mounting of two tractor units on an upstream side and a downstream side of a platen of a printer, a rocker member is pivotally mounted by a pivot pin on a side plate of a chassis to which the tractor unit is attachable. The rocker member has an upper end portion disposed close to an upper lock pin of a downstream side mounting portion. The lower end portion of the rocker member is disposed close to a lower lock pin of an upstream side mounting portion. When the tractor unit is locked with the lower lock pin, the lower end portion of the rocker member is firmly locked in position against rotation, so that the upper end portion of the rocker member is no longer separable from the upper rock pin, and hence, is able to prevent another tractor unit from moving into that portion.

REFERENCES:
patent: 3224366 (1965-12-01), Cummingham
patent: 4995745 (1991-02-01), Yokol et al.
patent: 5037222 (1991-08-01), Quick et al.
patent: 5123583 (1992-06-01), Kato et al.
"Bidirectional Printer Carriage", IBM Technical Disclosure Bulletin, vol. 15, No. 1, Jun. 1972, p. 157.
"Controlled Path for Continuous Form Feeding", IBM Tech. Disclosure Bulletin, vol. 1, No. 6, Apr. 1959, p. 3.
"Independent Dual Form Feed", IBM Technical Disclosure Bulletin, vol. 20, No. 8, Jan. 1978, pp. 3179-3180.
"Forms Carriage Horizontal Vernier", IBM Tech., Disclosure Bulletin, vol. 32, No. 513, Oct. 1989, pp. 250-252.

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