B - Operations – Transporting – 41 – J
Patent
B - Operations, Transporting
41
J
101/96.1
B41J 11/30 (2006.01)
Patent
CA 2010208
ABSTRACT OF THE DISCLOSURE Each of a pair of spaced apart paper feed mechanisms within the paper feed system of a dot matrix line printer has opposite upper and lower portions thereof slightly angled relative to each other and disposed on opposite sides of and close to an elongated print station having a platen at one side thereof on which the paper feed mechanisms are mounted. Each paper feed mechanism is locked in a desired position on the platen using a manually operated lever arm arrangement having a mechanical advantage. Phasing or pitch adjustment between the opposite portions of each paper feed mechanism is accomplished either by adjustment of an eccentric hub rotatably mounting a pulley which engages an endless belt between the opposite portions or by adjustment of a cam which engages a pivotable lever arm assembly having a belt engaging pulley at an opposite end thereof, in combination with an opposite spring mounted pulley which bears against the inside of and tensions the endless belt. A knob rotates a common shaft on which the eccentric hub or the cam of each paper feed mechanism is mounted to accomplish phasing adjustment. The opposite portions of each paper feed mechanism terminate in ramps which are angled to facilitate partial but not complete withdrawal of pins on the belt from apertures at the edges of the print paper as each pin advances to the end of the paper drive mechanism. A lug arrangement at the end of the ramp prevents the toothed underside of the belt from slipping off of the meshing teeth of a pulley about which the belt extends. Slide members resiliently mounted underneath hinged covers extending over the opposite portions of each paper feed mechanism bear against and maintain the edges of the paper in contact with the belts. Guides in the form of parallel ridges on a ribbon guide within the print station guide a length of paper introduced onto one portion of the paper feed mechanism through the print station and onto the other portion.
Barrus Gordon Brent
Emenaker Leo Joseph
Printronix Inc.
Smart & Biggar
LandOfFree
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