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Browse Prior Art Database

High Speed Keyboard

IP.com Disclosure Number: IPCOM000096255D
Original Publication Date: 1963-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Barnard, CP: AUTHOR [+2]

Abstract

The keyboard has a number of key assemblies 1, one for each key 2. Each assembly 1 has a code bar 3. Each bar 3 has a central opening into which extend a number of protrusions 4. Downward movement of key 2 moves bar 3 from left to right through bell crank 5. Protrusions 3 rotate bails 6 which operate contacts (not shown) and provide coded output signals.

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High Speed Keyboard

The keyboard has a number of key assemblies 1, one for each key 2. Each assembly 1 has a code bar 3. Each bar 3 has a central opening into which extend a number of protrusions 4. Downward movement of key 2 moves bar 3 from left to right through bell crank 5. Protrusions 3 rotate bails 6 which operate contacts (not shown) and provide coded output signals.

Protrusions 4 on each bar 3 are positioned differently according to the designation of relevant key 2. When a key is fully depressed, bell crank 5 is uncoupled from bar 3 which is returned to its rest position by sprint 7. All the bails remain in the positions in which they have been set save the bail 6a. This returns to its normal position and operates a contact (not shown) to signal a coded character is set up by the keyboard.

In order to prevent operation of another key too soon after the previously operated key, i. e., before the coded character is read from the keyboard, a delaying mass 10 slidable on an extension 1 1 of the code bar is provided. Movement of mass 10 is restrained by spring 12 which urges it towards stop 14. Inertia of mass 10 tends to prevent movement of bar 3 from right to left and provides the required delay action.

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