Browse Prior Art Database

Automatic Belt Recognition and Character Sequencing in a Belt Printer

IP.com Disclosure Number: IPCOM000080518D
Original Publication Date: 1974-Jan-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Faflak, DP: AUTHOR [+2]

Abstract

Automatic belt recognition in a belt printer and direct sequencing of belt image read-only memory (ROM) 7 is achieved with a sample select and sequencing circuit.

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Automatic Belt Recognition and Character Sequencing in a Belt Printer

Automatic belt recognition in a belt printer and direct sequencing of belt image read-only memory (ROM) 7 is achieved with a sample select and sequencing circuit.

When the printer belt, not shown, is up to operational speed the not-up-to-speed signal ceases in coincidence with a home pulse; counter 1 starts counting belt originated character pulses. The first character pulse sets latch 2 which in turn actuates the D input of D flip-flop 3. Upon occurrence of the following home pulse, flip-flop 3 changes state and closes gate 4, which freezes counter 1.

Counter 1 is a modulo-seven counter, the frozen count in it is unique for a printer belt, depending on the length of the character set on that belt.

Reset circuit 5 decodes the frozen count in counter 1 and resets belt image counter 6 after 48, 64 or 192 counts. Counter 6, advanced by character pulses, directly sequences ROM 7, which contains the three nested character sets of 48, 64 and 192 characters.

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