Browse Prior Art Database

Function Feedback Apparatus

IP.com Disclosure Number: IPCOM000092479D
Original Publication Date: 1966-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Castle, WH: AUTHOR [+2]

Abstract

In various machines it is often required to generate feedback signals indicating that certain functions are being performed. For example, in a typewriter or similar printing machines it may be necessary to know when a function operation having a variable time extent, such as a carrier return or tabulation operation, is in process.

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Function Feedback Apparatus

In various machines it is often required to generate feedback signals indicating that certain functions are being performed. For example, in a typewriter or similar printing machines it may be necessary to know when a function operation having a variable time extent, such as a carrier return or tabulation operation, is in process.

Carrier 10 for a print element, not shown, is mounted for sliding movement on guide shaft 11. Tabulation cord 12 is attached to carrier 10 and extends to tabulation drum 13 mounted on shaft 14. Carrier return cord 15 extends from carrier 10 about guide rolls and is wrapped in the opposite direction around carrier return drum 16. Mainspring 17 is mounted in mainspring housing 18 attached to frame 19 of the typewriter and tends to rotate shaft 14 counterclockwise to advance carrier 10 in the tabulation direction indicated by arrow 20.

During a tabulation operation the escapement apparatus, not shown, is released to permit carrier 10 to advance in direction 20 under the action of mainspring 17 until the next tab stop is sensed and the escapement apparatus is re-engaged. Carrier 10 is returned to its left margin position by mechanism, not shown, which operates via gear 21 to rotate shaft 14 clockwise and wind cord 15 on drum 16.

Attached to the rear of shaft 14 is slotted disk or light chopper 22. Disposed on opposite sides of disk 22 in cooperating relation are light source 23 and phototransistor 24. A pulsating...