Browse Prior Art Database

Screw Escapement

IP.com Disclosure Number: IPCOM000094748D
Original Publication Date: 1965-May-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Lieskovsky, VM: AUTHOR

Abstract

In this incremental stepping mechanism, a continuously excited linear stepping motor 1 is connected to rack 2 in the form of a threaded bar. The pitch of the threads is equal to twice the desired increment of motion. Escapement 3 is pivotally mounted at its center so that its ends ride along the sides of the threads.

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Screw Escapement

In this incremental stepping mechanism, a continuously excited linear stepping motor 1 is connected to rack 2 in the form of a threaded bar. The pitch of the threads is equal to twice the desired increment of motion. Escapement 3 is pivotally mounted at its center so that its ends ride along the sides of the threads.

As the bar moves axially, the contact between the threads and the ends of the escapement causes the latter to oscillate back and forth about its pivot 10. This oscillatory motion of the escapement continues for the duration of the axial movement of the bar. Transducer 4, such as an inductive probe, is mounted at either side of the escapement and converts the oscillations into pulses which are counted by counter 5.

The direction of movement of the bar can be sensed and the pulses assigned a positive or negative value for position identification. Control circuit 6 operates one of detenting solenoids 7 and 8 when the desired count has been reached. The plunger of the activated solenoid holds the end of the escapement against the bottom of the thread groove thus detenting the mechanism in position.

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