Browse Prior Art Database

Account Number Verifier for a Typewriter

IP.com Disclosure Number: IPCOM000090992D
Original Publication Date: 1969-Sep-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Schaefer, JO: AUTHOR

Abstract

A mechanical modulo-10, alternately weighted account number checking system used with a typewriter. The keying of an improper account number results in a locked machine. A carrier return operation automatically resets the verifier.

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 66% of the total text.

Page 1 of 2

Account Number Verifier for a Typewriter

A mechanical modulo-10, alternately weighted account number checking system used with a typewriter. The keying of an improper account number results in a locked machine. A carrier return operation automatically resets the verifier.

Numeric characters are spaced about a single row on print element 11 of the typewriter. Depression of a numeric entry key effects rotation of rotate arm 13 about pivot 15 to effect rotation of pulley 17, shaft 19, and print element 11 for a subsequent printing operation.

Translator 21 moves up or down in response to movement of rotate arm 13 and consists of two translate places 21a and 21b each containing a series of coded notches 23. An alternator, not shown, simultaneously drives probe 25 alternately either in the direction of arrow 27a or 27b so that probe 25 aligns with translator plate 21a or 21b.

Cam 29, attached to the print shaft, is rotated allowing spring 31 to move feed pawl 33 into engagement with ratchet 35. Spring 31 continues to index ratchet 35 until probe 25 encounters the selected projection of translator 21. Cam 29 then restores pawl 33 and probe 25 to home position. Translator 21 is restored to home position following the indexing cycle.

The next numeric entry is identical to the previous one except that probe 25 is moved into position to read the opposite translator plate 21. The third entry is identical to the first, etc. The accumulated total value of N consecutive cycles...