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Method Of Improving Dot Matrix Graphic Printout Appearance

IP.com Disclosure Number: IPCOM000049408D
Original Publication Date: 1982-Apr-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Johnson, RA: AUTHOR

Abstract

In dot matrix printers, a vertical column of print wires is arranged o to form a print column at the output end of a print head. The dot to dot spacing is typically equal among all the wires. Paper to be printed upon is incremented by a paper feed mechanism and, where all point addressable printouts for graphics are desired, the paper is generally incremented by the exact amount of a dot column height. However, due to mechanical and electrical tolerances, the incrementing may not be as precise as desired so that an additional amount of spacing may occur. This will result in a white line or unprinted portion in the resulting printout where the last dot in a previous line does not quite meet the first dot in the next line. This may be alleviated as follows.

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Method Of Improving Dot Matrix Graphic Printout Appearance

In dot matrix printers, a vertical column of print wires is arranged o to form a print column at the output end of a print head. The dot to dot spacing is typically equal among all the wires.

Paper to be printed upon is incremented by a paper feed mechanism and, where all point addressable printouts for graphics are desired, the paper is generally incremented by the exact amount of a dot column height. However, due to mechanical and electrical tolerances, the incrementing may not be as precise as desired so that an additional amount of spacing may occur. This will result in a white line or unprinted portion in the resulting printout where the last dot in a previous line does not quite meet the first dot in the next line. This may be alleviated as follows.

The incrementation tolerance beyond the desired point is measured for a given design. Then the wire matrix print head nosepiece is redesigned to provide a vertical column height equal to the desired incrementation distance plus approximately one-half or more of the tolerance distance. For example, if in a typical wire matrix print head the wire to wire spacing in the vertical direction is 1/64th of an inch, when seven wires in a print head are employed, the total center to center spacing from the top dot to the bottom one is 7/64th of an inch center to center. If the paper is nominally advanced 1/8 of an inch, the center to center spacing between the bot...