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Moving Armature Member for Printer Hammer Actuator

IP.com Disclosure Number: IPCOM000038406D
Original Publication Date: 1987-Jan-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 3 page(s) / 51K

Publishing Venue

IBM

Related People

Miller, ED: AUTHOR [+2]

Abstract

The armature member of an actuator for a printer hammer includes armature elements and moves longitudinally relative to pairs of pole pieces under the influence of a flux between pole pairs located adjacent to the armature elements. The cross section of the armature member is shaped so that the gap between each pair of pole pieces is reduced to a minimum while still keeping the armature member relatively rigid. As illustrated in Fig. 1, the actuator for a printer hammer includes a stator 1 formed in two halves 2, 3. Each stator half is generally E-shaped in side view with three legs forming pole pieces. The middle leg of each stator half is divided into two near its end so that four pole pieces are formed in each stator half.

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Moving Armature Member for Printer Hammer Actuator

The armature member of an actuator for a printer hammer includes armature elements and moves longitudinally relative to pairs of pole pieces under the influence of a flux between pole pairs located adjacent to the armature elements. The cross section of the armature member is shaped so that the gap between each pair of pole pieces is reduced to a minimum while still keeping the armature member relatively rigid. As illustrated in Fig. 1, the actuator for a printer hammer includes a stator 1 formed in two halves 2, 3. Each stator half is generally E- shaped in side view with three legs forming pole pieces. The middle leg of each stator half is divided into two near its end so that four pole pieces are formed in each stator half. The stator halves are placed together so that the pole pieces are grouped together in pairs with a gap between the pole pieces of each pole pair. The gaps are all aligned. A coil 4 is wound round the middle leg of each stator half. An armature member 5, made of non-magnetizable material, extends through the gaps 6, 7, 8 and 9 between the pairs of pole pieces. The armature member 5 is formed with four armature elements 11, 12, 13 and 14, made of magnetizable material and spaced apart by distances equal to the distances between the gaps 6, 7, 8 and 9. A hammer head 15 is formed at one end of the armature member 5, and the other end of the armature member is biased by a spring 16 in the direction of the arrow A. When the armature member 5 is in its rest position, each armature element 11, 12, 13 and 14 is located just outside a respective one of the gaps 6, 7, 8 and 9. When the coils 4 are energized a flux will be generated in the stator halves, as illustrated in Fig. 1. It will be noted that this flux flows through each of the armature elements 11, 12, 13 and 14. As a result, a force is exerted on each armature element, tending to move it into the adjacent gap. Consequently, there is a force on the armature member 5, tending to move it in the direction of the arrow B and thereby to cause the hammer head 15 to perform a printing operation. It has been found that more useful flux is generated for a given amount of input energy if the sizes of the gaps 6, 7, 8 and 9 between the pole pieces are...