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Print Hammer Rebound Dampener

IP.com Disclosure Number: IPCOM000040406D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02

Publishing Venue

IBM

Related People

Authors:
Mathews, RD [+details]

Abstract

In a printer print hammer damper, a transfer mass is used to transfer energy from a rebounding hammer to a secondary mass which, together with its spring, dissipates that energy. Due to this energy transfer, the hammer comes to rest almost instantaneously upon reaching its home position and is immediately available for the next print cycle. The problem is illustrated by the curve plotted in Fig. 1 which shows that the hammer bounces after reacing its home position and therefore the total time from hammer actuation to hammer again at res, t actual, is much greater that the ideal, t ultimate. It is apparent that this settling-down time reduces the hammer cycle repetition rate. Figs. 2, 3, and 4 show schematically the present embodiment at three sequential instants of time, together with corresponding displacement vs.