Means for attaching a tractor drive assembly to a platen

Details Means for attaching a tractor drive assembly to a platen Means for attaching a tractor drive assembly to a platen

1980-03-03

1982-08-17

Wright, Jr., Ernest T.

Typewriting machines

Sheet or web

For feeding web record-medium

400656, 226 74, 226 79, B41J 1500

Patent

active

043447155

ABSTRACT:
A locking system for directly clamping the tractor assemblies in a printer to the stationary platen in order to prevent any relative motion of the tractors with respect to the platen which may be caused by a lack of straightness of a drive bar which drives the tractors. The locking device includes an L-shaped lever which is pivotal so as to clamp a rearwardly extending portion of the platen between the bottom of the tractor and the top of a leg of the lever. The device may include a cam action locking knob which positively locks the lever in its clamped position. Both the lever and the knob are made of molded plastic. In order to balance the clamping force which is applied, a lever may be connected to each side of the tractor and actuated by a pair of connected cam action knobs. Several alternate locking systems are also disclosed.

REFERENCES:
patent: 2842250 (1958-07-01), Furman et al.
patent: 3283875 (1966-11-01), Davies
IBM Technical Disclosure Bulletin, "Transport for Metal-Coated Record Carrier", Bahr et al., vol. 17, No. 3, Aug. 1974, p. 777.

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