Browse Prior Art Database

Rotative Motion Transducer

IP.com Disclosure Number: IPCOM000093035D
Original Publication Date: 1967-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Bishop, DA: AUTHOR [+3]

Abstract

Rotational motion of shaft 1 about axis AA in either direction is indicated by the opening of normally open reed switch 2 by off-center movement of permanent magnet 3. Shaft 1 carries internal drum 4 of viscous clutch 5 containing suitable viscous oil 6. Outer housing 7 of clutch 5 includes an arm 8 that carries magnet 3. Centering spring 9 restores housing 7 to a normal, centered position.

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Rotative Motion Transducer

Rotational motion of shaft 1 about axis AA in either direction is indicated by the opening of normally open reed switch 2 by off-center movement of permanent magnet 3. Shaft 1 carries internal drum 4 of viscous clutch 5 containing suitable viscous oil 6. Outer housing 7 of clutch 5 includes an arm 8 that carries magnet 3. Centering spring 9 restores housing 7 to a normal, centered position.

Motion of shaft 1 in either direction drags housing 7 and arm 8 in that direction against spring 9 and displaces magnet 3 from the center of reed switch 2 permitting the switch contacts to close. Flexible diaphragm 10 within clutch 5 compensates for thermal expansion of oil 6.

Optimum magnet switch cooperation is obtained by locating the axis of magnet 3 parallel to the axis AA of shaft 1 and in the plane dividing the contacts of reed switch 2. This transducer is useful in detecting motion of a typewriter carriage for remote timing purposes.

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