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US 4,328,746 AGranted
Weighted modulus numbering apparatus
AssigneeInterface Systems, Inc.
InventorsIra Eglowstein, Peter E. Solender
Life of this patent
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AssigneeInterface Systems, Inc.
InventorsIra Eglowstein, Peter E. Solender
Estimating the term…
Weighted modulus numbering apparatus is capable of printing composite numbers consisting of serial identification numbers and accompanying check digits which are determined in accordance with a system where the check digits for certain identification numbers may be invalid, as by requiring a two-digit number rather than an allowable single-digit number. The check digits are generated in the form of digital (for example, binary) words and decoded to provide a signal representing the validity or invalidity of the check digit. A memory stores the check digit words and a bit representing the validity/invalidity of the check digit. The decoding of an invalid check digit operates to cause the word representing the check digit for the next successive identification number to be stored with the valid/invalid bit in memory. The numbering machine, which presents the successive identification numbers for printing, is caused to increment twice in response to a signal representing an invalid check digit. Since the check digit word stored with the signal representing the invalid check digit represents the check digit for the next successive identification number, a check digit numbering wheel is positioned in response to that check digit word and will print the proper check digit for the next successive identification number and also a valid check digit.
Weighted modulus numbering apparatus for printing a check digit with an identification number in successive printing cycles using a weighted modulus system which produces invalid check digits for certain of said identification digits, said apparatus comprising identification number printing means and check digit printing means for presenting a composite number for printing, means operative to increment said identification number printing means to selectively present the first or the second successive identification numbers for printing during each printing cycle, means for generating successive words according to said weighted modulus system representing check digits associated with said successive identification number, including said invalid check digits, means responsive to said identification numbers for providing digital signals representing the validity or invalidity of the check digits therefor, means for storing said successive check digit words with the digital signals representing the validity and invalidity thereof, each said printing cycle, and for storing the next successive one of said check digit words with said digital signal when said digital signal represents an invalid check digit word, first control means for said identification number incrementing means for causing it to increment to said second successive identification number when said digital signal represents said invalid check digits and to said first successive first identification number when said digital signal represents said valid check digits, and second control means for operating said check digit printing means in response to said check digit word in said storing means.
Dependencies are inferred from the claim text.