Print Element Electromagnetic Actuator With Permanent Magnet and Soft Iron Armature Segments
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09
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.