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Printing Numbering Head for Self Checking Number Modulus 11

IP.com Disclosure Number: IPCOM000091758D
Original Publication Date: 1968-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Lavin, WJ: AUTHOR [+2]

Abstract

Printing of serial numbers with their corresponding check-11 digit on documents, such as paper forms or cards, is accomplished. A numbering head with individually driven wheels and a logic system to generate the check digit and control the advancement of the wheels are used.

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Printing Numbering Head for Self Checking Number Modulus 11

Printing of serial numbers with their corresponding check-11 digit on documents, such as paper forms or cards, is accomplished. A numbering head with individually driven wheels and a logic system to generate the check digit and control the advancement of the wheels are used.

As in A, numbering head 1 has wheels 2 that are selectively drivable by respective gears, like 3, mounted on corresponding shafts 4 arranged radially around the wheels. A ball and spring detent, not shown, in the fixed center shaft presses against recesses in the numbering wheel assembly. As in B, each drive shaft 4 is connected either directly or indirectly by gears 5 and 5' to a respective rotary solenoid or pulse motor 6 that serves as a drive control for a rotary monitor switch 7.

The logic system consists of a binary-coded counter analogous to that used in a binary-coded decimal counter. The values of each digit and its checking factor are reduced to a modulus-11 number and entered in binary code. The counter adds the values for two positions and reduces the sum to a modulus-11 number by adding 5 and ignoring the 16's carry. The new number is then added to the next position in the same manner until all positions are added. The final result activates the proper circuit to select the check digit to be printed or displayed. This system can be duplicated by using rotary switches with multiple decks and connecting all positions which...