Browse Prior Art Database

Braille Display

IP.com Disclosure Number: IPCOM000087107D
Original Publication Date: 1976-Dec-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 71K

Publishing Venue

IBM

Related People

Tophin, G: AUTHOR [+2]

Abstract

This tactile display device assists blind users of electric typewriters of the type having a single type element and an error correction feature.

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Braille Display

This tactile display device assists blind users of electric typewriters of the type having a single type element and an error correction feature.

The tactile display unit is connected to a host typewriter, and includes a logic interface to perform the translation of the control signals of the type element into control signals for the tactile display.

The tactile unit consists of a pin-guide element 2, molded as a single piece of plastic material, having a reading surface 3 on which pins 4 can be made to protrude when in the set position. Pins 4 are disposed to form a suitable number of braille characters (matrix 5) arranged in a single line corresponding to the printing line of the host machine. Pins 4 are maintained in set or nonset position by friction in the pin-guide element 2.

When keyed by the operator, a character is simultaneously printed by the host machine and displayed in braille in the corresponding matrix of the reading surface. The relevant matrix pins 4 are actuated by the pin-pusher assembly 6. The pin pusher 6 consists of a matrix assembly of push rods 7 corresponding to the braille matrix 5. The whole assembly is movable on guide 8 and is driven by a stepping motor through belt 9 in order to step the pin pusher assembly under the position of the next braille character after each character display.

Push rods 7 are actuated by pivoting spring-loaded bellcranks connected to a corresponding number of magnets located in the fixed magnet assembly 10, which is connected by bowden cables 12 to movable carriage 11. The carriage 11 carries a column indicator 16 which projects through the reading table and allows the operator to locate it...