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Print Element Electromagnetic Actuator With Permanent Magnet and Soft Iron Armature Segments

IP.com Disclosure Number: IPCOM000061355D
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Miller, ME: AUTHOR

Abstract

The armature member of an electromagnetic actuator for a print element, for example, a wire element for a printer, is formed with both permanent magnet and soft iron armature segments cooperating with gaps between pole faces of a stepper member. The figure illustrates this arrangement diagrammatically. The actuator comprises two E-shaped stator members 1,2 formed with legs 3,4,5 and 6,7,8, respectively, and a coil 9 extending around the middle leg 4 of member 1. The legs 3,4,5 terminate in pole faces 16,17,18,19 as illustrated. The legs 6,7,8 terminate in pole faces 21,22,23,24 as illustrated and these faces are located adjacent the faces 16,17,18,19 so as to define gaps 25,26,27,28 between each pair of faces 16,21; 17,22; 18,23; 19,24. The gaps 25,26,27,28 are all aligned and a slider 31 is located within these gaps.

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Print Element Electromagnetic Actuator With Permanent Magnet and Soft Iron Armature Segments

The armature member of an electromagnetic actuator for a print element, for example, a wire element for a printer, is formed with both permanent magnet and soft iron armature segments cooperating with gaps between pole faces of a stepper member. The figure illustrates this arrangement diagrammatically. The actuator comprises two E-shaped stator members 1,2 formed with legs 3,4,5 and 6,7,8, respectively, and a coil 9 extending around the middle leg 4 of member 1. The legs 3,4,5 terminate in pole faces 16,17,18,19 as illustrated. The legs 6,7,8 terminate in pole faces 21,22,23,24 as illustrated and these faces are located adjacent the faces 16,17,18,19 so as to define gaps 25,26,27,28 between each pair of faces 16,21; 17,22; 18,23; 19,24. The gaps 25,26,27,28 are all aligned and a slider 31 is located within these gaps. One end 32 of the slider is adapted to operate a wire element of a printer of any known form. In the slider 31 are located soft iron segments 33,34,35,36 and permanent magnet segments 37,38. Each of the soft iron segments is located adjacent to (and on the left side of as viewed in the figure) a respective one of the gaps 25,26,27,28 and the permanent magnet segments 37,38 are each located to the right (as viewed in the figure) of the gaps 25,27, respectively. The permanent magnet segments 37,38 each has a pair of poles and the poles are oriented as illustrated. In order to move the slider 31 and actuate the associated wire element, the coil 9 is energized so that a North pole is formed at pole faces 16,22,23,19 and a South pole is formed at pole faces 21,17,18,24 as illustrated. The formation of these poles produces a force attracting each of the soft iron segments 33,34,35,36 into its adjacent gap, thereby tending to move the slider 31 to the right as viewed in the figure. In addition, the formation of these po...