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Additional Print Positions for a Matrix Printer

IP.com Disclosure Number: IPCOM000083363D
Original Publication Date: 1975-May-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Raider, JW: AUTHOR

Abstract

While on-the-fly wire matrix printers are known, in which one print head with a vertical row of seven print wires is incremented across the left half of the paper to form the desired characters and a separate print head increments in tandem across the right side of the paper, the apparent advantages of this arrangement are lost if all the printing is in either the first half or the last half of the page.

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Additional Print Positions for a Matrix Printer

While on-the-fly wire matrix printers are known, in which one print head with a vertical row of seven print wires is incremented across the left half of the paper to form the desired characters and a separate print head increments in tandem across the right side of the paper, the apparent advantages of this arrangement are lost if all the printing is in either the first half or the last half of the page.

By using a print head in which two or more rows of wires arc incorporated with at least one row having print wires in the same horizontal line as the other and spaced less than a character width apart and in a fractional or compound multiple of the pitch, increased speed can be attained for most applications. If the additional wires are placed at locations where horizontal lines more commonly occur, only a limited number of wires would be needed in the additional row.

Fig. 1A shows how the dots produced by the additional wires overlap those of the primary wires and Fig. 1B shows an arrangement of the primary and additional print wires in a typical head layout as proposed.

Figs. 2, 3 and 4 show how characters are formed with only five extra print elements, as shown in Fig. 1.

A sixth print element between the second and third additional wires counting from the top would improve the following characters: B E F H S X - + 3568.

In all cases there would be a horizontal line available more nearly in the center of the char...