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Print Hammer Mounting Arrangement for a Matrix Printer

IP.com Disclosure Number: IPCOM000043108D
Original Publication Date: 1984-Jul-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Lean, EG: AUTHOR [+2]

Abstract

Matrix line printers which are presently known have print hammers with an embossed dot on each hammer face. The hammer pushes the dot onto the ribbon and the paper to make an impression of a dot. As shown in Fig. 1, the hammers 10 with dots 12 are equally spaced on mounting bar 14 along the print line. When the hammer assembly shuttles back and forth a horizontal distance of W, each hammer covers a print width of W. A number of hammers cover an entire paper width. After a single dot line (a pel (print element)) is printed, the hammer assembly turns around and the paper increments one pel and it is ready to print another dot line. A drawback of this present structure is that a great deal of time is wasted due to the time it takes for the hammer to turn around and for the paper to increment at every single dot line.

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Print Hammer Mounting Arrangement for a Matrix Printer

Matrix line printers which are presently known have print hammers with an embossed dot on each hammer face. The hammer pushes the dot onto the ribbon and the paper to make an impression of a dot.

As shown in Fig. 1, the hammers 10 with dots 12 are equally spaced on mounting bar 14 along the print line. When the hammer assembly shuttles back and forth a horizontal distance of W, each hammer covers a print width of W. A number of hammers cover an entire paper width. After a single dot line (a pel (print element)) is printed, the hammer assembly turns around and the paper increments one pel and it is ready to print another dot line. A drawback of this present structure is that a great deal of time is wasted due to the time it takes for the hammer to turn around and for the paper to increment at every single dot line. For 5 by 7 matrix character printing, it requires seven hammer turns and seven paper increments to complete a character line. An improvement is described herein in which the print hammers are mounted on a stepped mounting plate 16, as shown in Fig.
2. The size of the step and the number of steps depend on the selected character heights and resolutions. Fig. 2 shows a configuration of the improved print hammer assembly for a seven-dot-height character set. Seven hammers as a group cover seven equally spaced dot lines which form characters. As the hammer assembly travels a distance of D, an entire cha...