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Magnetically Restorable Free Flight Hammer

IP.com Disclosure Number: IPCOM000077557D
Original Publication Date: 1972-Aug-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Engel, G: AUTHOR [+4]

Abstract

An electromagnetic actuator 10 has a stator core 12 with an armature 14 pivotally supported on a shaft 16 by side plates 18. The operating winding 20 is positioned on a projecting pole 22 having an inclined end portion 24, so as to accommodate a complementarily inclined end 26 of the armature.

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Magnetically Restorable Free Flight Hammer

An electromagnetic actuator 10 has a stator core 12 with an armature 14 pivotally supported on a shaft 16 by side plates 18. The operating winding 20 is positioned on a projecting pole 22 having an inclined end portion 24, so as to accommodate a complementarily inclined end 26 of the armature.

The armature has an extension 28 which is positioned in a recess 30 in a slidable print hammer 32, which is mounted in a plastic guide 34. A permanent magnet M is held between upwardly-projecting side plates 36.

The magnet M normally holds the print hammer 32 in the retracted position. The winding 20 is pulsed to operate the armature 14, the pulse being cut off before impact against a residual between the pole pieces. When the armature 14 impacts the residual, the hammer 32 continues in free flight because of the clearance of the armature extension in the hammer recess 30.

The rebounding hammer 32 couples with the armature 14 and restores both to original position. The permanent magnet provides mechanical and electrical damping for both active parts.

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