Browse Prior Art Database

Overprint Circuit

IP.com Disclosure Number: IPCOM000046235D
Original Publication Date: 1983-Jun-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Tokunaga, E: AUTHOR

Abstract

This article describes an overprint circuit for a dot printer including an overprint control buffer for storing the number of times of the overprint in each print position of one print line, plural line buffers for storing coded character signals of the print line and coded mark signals to be overprinted on the characters, and an image generator for responding to the overprint control buffer to generate a dot pattern of the character and the marks to be overprinted on a recording sheet.

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Overprint Circuit

This article describes an overprint circuit for a dot printer including an overprint control buffer for storing the number of times of the overprint in each print position of one print line, plural line buffers for storing coded character signals of the print line and coded mark signals to be overprinted on the characters, and an image generator for responding to the overprint control buffer to generate a dot pattern of the character and the marks to be overprinted on a recording sheet.

Such text data stream for one line as shown in the figure is applied to a data stream processor/controller l0. The text data stream includes coded signals representing characters "A", "B" and "C" and marks, such as underscore "_", and print control signals BS representing back space. The three back space signals indicate that the character "A" and the mark "_" are overprinted in a first print position and the character "B" and the mark "_" are overprinted in a second print position. The data stream processor/controller l0 decodes the text data stream for one print line to determine whether it includes the back space signal BS. For the exemplary text data stream, the data stream processer/controller 10 stores the coded signals of "A", "B" and "C" into the positions 1, 2 and 3, respectively, of a first line buffer 13, and stores count value 1 in positions 1, 2 and 3 of an overprint control buffer 12 in block 11.

At the occurrence of the three back space signals, th...