Browse Prior Art Database

Control Device

IP.com Disclosure Number: IPCOM000097884D
Original Publication Date: 1961-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Seibel, R: AUTHOR

Abstract

In machines, e.g., typewriters, the arrangement exerts control when a derivative function of the key displacement exceeds a predetermined amount. This function may be dependent, alone or in combination, upon the velocity, acceleration or rate of acceleration of key displacement.

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Control Device

In machines, e.g., typewriters, the arrangement exerts control when a derivative function of the key displacement exceeds a predetermined amount. This function may be dependent, alone or in combination, upon the velocity, acceleration or rate of acceleration of key displacement.

Sectional and bottom views of a mechanical differentiator are shown. Mechanism 35 is attached to key bar 2 of a typewriter and operated by finger button 34. A pressure exerted on 34 moves piston 42 downwardly against the bias of the resetting spring. This increases the air pressure in cylinder 40. When the air pressure reaches a predetermined amount, a downward movement of the bar 2 takes place. The opening 46, 56, which is adjustable, controls the air that can escape. Thus, actuation of key bar 2 depends upon the velocity of the movement of button 34.

Movement of bar 2 takes place in case the derivative function does not exceed the predetermined amount. Whenever there is no actuation through the medium of the air pocket within cylinder 40, piston 42 abuts stop 59 and causes movement of bar 2.

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