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Browse Prior Art Database

Check Digit Printer

IP.com Disclosure Number: IPCOM000088284D
Original Publication Date: 1977-May-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Mizzi, JV: AUTHOR [+2]

Abstract

Bank checks and guest checks for restaurants often use identifying numbers that would run in a counting sequence except that they are encoded with a check digit for detecting errors that may occur in entering the number into a data processing system. Thus, checks having the extra digit can not be printed by means of conventional electromechanical printers that are incremented serially.

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Check Digit Printer

Bank checks and guest checks for restaurants often use identifying numbers that would run in a counting sequence except that they are encoded with a check digit for detecting errors that may occur in entering the number into a data processing system. Thus, checks having the extra digit can not be printed by means of conventional electromechanical printers that are incremented serially.

In the apparatus of the drawing, unnumbered checks are fed from a hopper 2, through a mechanical printer 3 that prints multidigit numbers in a counting sequence, through a wire matrix printer 4 that prints a single check digit, and to a check stacker 5. A check digit calculator 6 computes the check digit for the number that is printed by the mechanical printer and supplies a signal to the wire matrix printer to subsequently (or simultaneously) print the check digit. The connection between the check digit calculator and the wire matrix printer may comprise five lines, a set of four lines 7 carrying a binary code for the check digit that is to be printed and a single line 8 carrying a strobe signal that indicates that the three-bit code is valid.

A line 10 may be provided from the printer or other components of the check feed handling apparatus to signal to the check digit calculator that a new check is in position to be printed. A keyboard 12 is connected to the check digit calculator for entering the starting number for the checks. The printer 3 can be manually...