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Automatic Left Margin Adjustment Procedure

IP.com Disclosure Number: IPCOM000045184D
Original Publication Date: 1983-Feb-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Moeller, DL: AUTHOR

Abstract

In conventional wire matrix printers, the printer tracks position by the utilization of three print emitter signals which occur every .01" of printhead travel. These emitter signals occur in a sequence of 1,2,3,1,2,3... in the forward direction and 3,2,1,3,2,1... in the reverse direction. When power is first applied to the printer, it must initialize its position with respect to another signal referred to as the left margin signal. During the course of a printing task, the printhead may recalibrate several times and this recalibration must always occur on the same print emitter pulse to prevent registration errors. This could be done by calibrating on the first emitter pulse after the left margin signal switches. However, a problem arises if the left margin signal switches on the edge of a print emitter signal.

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Automatic Left Margin Adjustment Procedure

In conventional wire matrix printers, the printer tracks position by the utilization of three print emitter signals which occur every .01" of printhead travel. These emitter signals occur in a sequence of 1,2,3,1,2,3... in the forward direction and 3,2,1,3,2,1... in the reverse direction. When power is first applied to the printer, it must initialize its position with respect to another signal referred to as the left margin signal. During the course of a printing task, the printhead may recalibrate several times and this recalibration must always occur on the same print emitter pulse to prevent registration errors. This could be done by calibrating on the first emitter pulse after the left margin signal switches. However, a problem arises if the left margin signal switches on the edge of a print emitter signal. The exact switching point of both the left margin and that print emitter signal may be such that sometimes the left margin signal will switch just before the emitter change and sometimes just after. This could cause a calibration error of one emitter position.

In prior printers, this problem was solved by calibrating on the first print emitter 3 signal occurring after the left margin signal switches and by physically adjusting the left margin print emitter relationship such that the left margin signal switched between the print emitter 1 and print emitter 2 signals. This insured that the left margin would not swit...