Mechanism for positioning tractors

Advancing material of indeterminate length – Means to engage longitudinally spaced modifications in material – Pins on flexible belt or chain

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Details

74553, 74554, 192 17R, 192 95, G03B 130, G05G 110, F16D 6702

Patent

active

052321401

ABSTRACT:
Apparatus for use with a printer which has a pair of tractors that engage sprocket holes in the paper to adjust for different paper widths or to adjust the lateral position of the paper. The apparatus comprises a pair of coaxial lead screws, one attached to a rotatable shaft and the second rotatable on the shaft adjacent to and relative to the one lead screw. One tractor is coupled to each lead screw. Rotation of the one lead screw is obtained by a knob keyed to an end of the rotatable shaft. Rotation of the second lead screw is prevented during rotation of the knob by spring loaded fingers with detent elements engageable with detention gearing on the end of the second lead screw. Rotation of both screws is obtained by rotation and axial movement of the knob on the shaft so that a cam surface on the knob engages cams of the spring fingers to disengage detent elements from the detention gearing and drive gearing on the knob engages drive gearing on the second lead screw.

REFERENCES:
patent: 2285197 (1942-06-01), Euth
patent: 3006520 (1961-10-01), House
patent: 3407981 (1968-10-01), Staugaard
patent: 3420352 (1969-01-01), Moran et al.
patent: 3477626 (1969-11-01), Hilpert
patent: 3578138 (1971-05-01), Cantwell
patent: 4546908 (1985-10-01), Cassese et al.
patent: 4549716 (1985-10-01), Warren
IBM Technical Disclosure Bulletin vol. 29 No. 12 May 1987.

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