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Shift Register Array for Matrix Printer

IP.com Disclosure Number: IPCOM000044267D
Original Publication Date: 1984-Nov-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Stokes, RF: AUTHOR

Abstract

Picture element data for controlling a high resolution dot matrix print head 1 is delivered to shift register array 2 which provides a varied set of delay periods necessary to control individual printing elements 3 in synchronism with the movement of the print head. Printing elements 3, such as jet nozzles labeled A-I, are spaced across print head 1 at horizontal spacing increments determined by the physical limitations of the print mechanism. The vertical displacement between adjacent elements 3, e.g., A, B, is the distance between printable matrix dots. The image of a vertical slice 4 through a character to be printed is delivered to input buffer 5 of the shift register array 2 when the print head 1 is one increment from the position where the leading row of print elements (e.g.

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Shift Register Array for Matrix Printer

Picture element data for controlling a high resolution dot matrix print head 1 is delivered to shift register array 2 which provides a varied set of delay periods necessary to control individual printing elements 3 in synchronism with the movement of the print head. Printing elements 3, such as jet nozzles labeled A-I, are spaced across print head 1 at horizontal spacing increments determined by the physical limitations of the print mechanism. The vertical displacement between adjacent elements 3, e.g., A, B, is the distance between printable matrix dots. The image of a vertical slice 4 through a character to be printed is delivered to input buffer 5 of the shift register array 2 when the print head 1 is one increment from the position where the leading row of print elements (e.g., A, E, I) will become aligned with region 6 on the print media where character slice 4 is to be printed. This position is shown as two positions 6F and 6R, depending upon whether printing is progressing in the forward (left-to-right) or reverse (right- to-left) direction. As print head 1 moves across the print media, the strip image is shifted in synchronism rightwardly through array 2. The array includes output connections F, which are used for printing in the forward direction, and R, which are used for printing in the reverse direction. These output connections are further labeled a, b, c, etc., to show their individual association with respect...