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Escapement Deceleration for Typewriters

IP.com Disclosure Number: IPCOM000053540D
Original Publication Date: 1981-Oct-01
Included in the Prior Art Database: 2005-Feb-12

Publishing Venue

IBM

Related People

Authors:
Cronch, DD Weise, WR [+details]

Abstract

Escapement deceleration logic is used to reduce wear and facilitate accurate positioning for typewriters that normally switch between an engaged and disengaged condition for stopping escapement motion. In adding such deceleration logic, a train of emitter pulses that indicate escapement increments is first modified by adding false pulses to "trick" the normal control logic into an advance determination that the escapement is completed. A corresponding number of actual pulses are cancelled at the end of the escapement as the deceleration logic oversees final escapement motion to a stop at the destination.