Browse Prior Art Database

Ribbon Usage Indicator

IP.com Disclosure Number: IPCOM000093716D
Original Publication Date: 1966-Jan-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Caudill, AH: AUTHOR

Abstract

The device provides a signal when a ribbon in a business machine, such as an electric typewriter, is used to a predetermined extent. When the signal is observed, the typist changes the ribbon track or changes the ribbon as required to insure high quality printing.

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Ribbon Usage Indicator

The device provides a signal when a ribbon in a business machine, such as an electric typewriter, is used to a predetermined extent. When the signal is observed, the typist changes the ribbon track or changes the ribbon as required to insure high quality printing.

One arm of sensing member 10 engages ribbon spool 15. Such arm detects the change in diameter in the ribbon wound on spool 15 as the ribbon is fed back and forth past the printing point. Each time the diameter of the ribbon on spool 15 changes by a predetermined amount representing a reversal in the direction of ribbon travel, the other arm of member 10 moves down to advance ratchet wheel 12 by one tooth.

A spring clutch checks the motion of ratchet 12 each time member 10 is reset by torsion spring 16. Eventually, slot 13 in ratchet 12 overlies the end of spring- biased flag 14 so the latter is free to spring to its vertical position. Flag 14 provides the signal to the typist indicating action is required to change the ribbon track or the ribbon. Flag 14 is reset by depressing its end through slot 13 and latching the same under ratchet 12.

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