Browse Prior Art Database

Key Identification System

IP.com Disclosure Number: IPCOM000086603D
Original Publication Date: 1976-Oct-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Eliezer, DE: AUTHOR [+2]

Abstract

In typewriters with ball shaped printing elements, there are a large number of selectively usable elements which differ in type style or in the use of special character sets for programming, mathematics, measurements, or other special technology and industry uses. The keys of the keyboard have been imprinted with a plurality of different characters for the different sets of symbols or have been provided with overlays which are changed to conform to the type ball being used.

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Key Identification System

In typewriters with ball shaped printing elements, there are a large number of selectively usable elements which differ in type style or in the use of special character sets for programming, mathematics, measurements, or other special technology and industry uses. The keys of the keyboard have been imprinted with a plurality of different characters for the different sets of symbols or have been provided with overlays which are changed to conform to the type ball being used.

The present system provides for a changeable display on each key and a character control device, set by the ball installed in the typewriter, to change the displayed characters to characters that will be printed. As shown, each type ball 1 is provided with one or more pins 2 which, singly or in combination, identify the ball. When the ball is mounted in the typewriter, these pins 2 are received in openings 3 of a collar 4 to activate one or a combination of signal lines 5 that are connected to a key control element 6, which determines what characters are to be displayed on the keys 7 of the keyboard.

The keys 7 (Figs. 2 and 3) are formed with a transparent lens cap 8 which contacts an LED or some other type of changeable display device 9, having a set of control leads 10 connected to the control element 6. The display device 9 may be of sufficient size to display both the upper and lower case characters for an attached type ball 1.

However, by a further control connec...