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Print Hammer Actuator

IP.com Disclosure Number: IPCOM000059907D
Original Publication Date: 1986-Feb-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Brown, DS: AUTHOR [+2]

Abstract

An electromagnetic actuator for a print hammer includes a stator formed in two parts. An armature member is located between the two stator parts and includes one or more armature elements and an energizing coil. The armature is also formed with a hammer head. Energization of the coil causes movement of the armature member relative to the stator. Fig. 1 is a diagrammatic side view, and Fig. 2 is a diagrammatic perspective view of the actuator partly cut away. The stator is formed from soft magnetic iron in two identical halves 1, 2. Each half is generally E-shaped with three legs. The two sets of three legs 3, 4 and 5 and 6, 7 and 8 form three pairs of pole pieces.

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Print Hammer Actuator

An electromagnetic actuator for a print hammer includes a stator formed in two parts. An armature member is located between the two stator parts and includes one or more armature elements and an energizing coil. The armature is also formed with a hammer head. Energization of the coil causes movement of the armature member relative to the stator. Fig. 1 is a diagrammatic side view, and Fig. 2 is a diagrammatic perspective view of the actuator partly cut away. The stator is formed from soft magnetic iron in two identical halves 1, 2. Each half is generally E-shaped with three legs. The two sets of three legs 3, 4 and 5 and 6, 7 and 8 form three pairs of pole pieces. The armature member 11 is formed with a body 12 of a non-magnetizable material and three armature elements of soft iron 13, 14 and 15 located at spaced- apart positions within the body 12. A coil 16 extends around the middle armature element 14 and adjacent to the outer armature elements 13 and 15. The coil 16 is formed wholly within the body 12 and does not extend to the surface of the body, as illustrated in Fig. 2. A hammer head 17 is formed at one end of the armature member 11. At the other end of the armature member 11 are formed a pair of coil leads 18 constructed as a return spring attaching the armature member 11 to a fixed structure. The spring may be provided with a damper. An adjustable device extending between the end of the armature member 11 and the fixed structure de...