Browse Prior Art Database

Print Element Character Set Status Logic

IP.com Disclosure Number: IPCOM000080271D
Original Publication Date: 1973-Nov-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Mayo, RF: AUTHOR

Abstract

The circuit shown provides means for determining the number of characters in each font (character set) on a print element such as a chain, belt, or disk, so that the proper corresponding translation table can be identified. The circuitry utilizes an existing print element character reference counter 11, which normally functions to indicate the instantaneous position of the print element.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 61% of the total text.

Page 1 of 2

Print Element Character Set Status Logic

The circuit shown provides means for determining the number of characters in each font (character set) on a print element such as a chain, belt, or disk, so that the proper corresponding translation table can be identified. The circuitry utilizes an existing print element character reference counter 11, which normally functions to indicate the instantaneous position of the print element.

The circuit operates as follows. During the reset portion of the initialization time, font identity latches 23 through 29, and character reference counter 11, are reset by the signal line labeled RESET. During this reset time the print element is brought up to printing speed. When the print element is at operating speed, a character pulse is provided by the printer corresponding to each character of a font, and home pulses are provided for indicating the beginning and end of each font of characters.

During the second part of the initialization period the line labeled INITIALIZE is active for a period of time, which is greater than the time required for two font sets to pass a print position. During the INITIALIZE time, the character reference counter 11 is decoded by decode circuitry 13 to provide a signal at one of its outputs labeled 48, 64, 96, or 128, whenever the count in the character reference count 11 has incremented to 47, 63, 95, or 127, respectively. An output of decode 13 sets one of latches 23 through 29 via one of AND gates 1...