Tractor units for push-pull printer

Details Tractor units for push-pull printer Tractor units for push-pull printer

1989-05-02

1990-09-04

Crowder, Clifford D.

Typewriting machines

Sheet or web

For feeding web record-medium

B41J 1128

Patent

active

049539973

ABSTRACT:
A push-pull printer includes at least one tractor unit thus is formed to have both a pull function and a push function. Fork-like mounting portions are respectively formed at lower portions of a pair of frames provided at both ends of the tractor unit. A pair of tractor guides are located at each of push and pull feed positions of the printer body. Each guide detachably holds a corresponding fork-like mounting portion. When the tractor is to be used in the push type paper feed mode, the fork-like mounting portions are attached to the tractor guides located at the push feed position. However, for use in the pull type paper feed mode, the fork-like mounting portions are attached to the tractor guides located at the pull feed position. Two such tractors, one providing the pull function and the other the push function, can be used cooperatively.

REFERENCES:
patent: 3753483 (1973-08-01), Lundquist et al.
patent: 4269522 (1981-05-01), Levinson et al.
patent: 4440516 (1984-04-01), Rosenthal et al.
patent: 4571103 (1986-02-01), Takeo et al.
Kroeker, "Detachable Printer Pin Feed", IBM Tech. Disc. Bul., vol. 18, No. 11, p. 3536, Apr., 1976.
Darwin et al., "Bidirectional Printer Carriage", IBM Tech. Disc. Bul., vol. 15, No. 1, Jun. 1972, p. 157.

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