EP 0216943 B1 19891102 - ELECTROMAGNETIC ACTUATOR, IN PARTICULAR FOR DRIVING PRINT HAMMERS
Title (en)
ELECTROMAGNETIC ACTUATOR, IN PARTICULAR FOR DRIVING PRINT HAMMERS
Publication
Application
Priority
EP 85109847 A 19850806
Abstract (en)
[origin: EP0216943A1] 1. Electromagnetic actuator mechanism for switching, stroke or impact motions, comprising a clapper armature (1) and an electromagnet (2) consisting of an excitation coil (3) and a magnetizable yoke structure (4), wherein the clapper armature is attracted by the yoke structure upon excitation of the electromagnet, characterized in that the yoke structure has a substantially E-shaped cross-section with two outer legs (5, 6), one center leg (7) and a base (8) common to all legs, and said cross-section lies in the magnetic flux plane, wherein the pole face (7A) of the center leg (7), encompassed by the excitation coil (3), faces the clapper armature (1), and the free ends of the outer legs are so bent in a direction towards each other that a magnetic operating gap (9) is formed between their pole faces (5A, 6A), outside or inside of which the pole face (7A) of the center leg (7) is positioned, the motional plane (1A) of the clapper armature (1) extends perpendicularly to the plane (4A) of the magnetic flux (4B) of the yoke structure (4) of the electromagnet, upon excitation of the electromagnet (2), the clapper armature (1) is pulled inside the operating gap (9) in a known manner by the forces occurring between its pole faces (5A, 6A) and the clapper armature, and in the process, the clapper armature (1) is increasingly attracted by the pole face (7A) of the center leg (7), with substantially half of the magnetic flux of the center leg passing across the clapper armature (1) to one pole face (5A, 6A) of the operating gap (9), and the length of the clapper armature (1) between its pivotal axis (10) and the operating gap (9) is more than twice the width of the clapper armature (1) between the pole faces (5A, 6A) of the operating gap (9).
IPC 1-7
IPC 8 full level
B41J 2/275 (2006.01); H01F 7/08 (2006.01)
CPC (source: EP)
H01F 7/081 (2013.01)
Designated contracting state (EPC)
BE CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0216943 A1 19870408; EP 0216943 B1 19891102; AR 242683 A1 19930430; BR 8603482 A 19870304; CA 1249625 A 19890131; DE 3574072 D1 19891207; ES 297044 U 19880416; ES 297044 Y 19881201; JP H0533666 B2 19930520; JP S6235857 A 19870216
DOCDB simple family (application)
EP 85109847 A 19850806; AR 30481186 A 19860806; BR 8603482 A 19860724; CA 503282 A 19860304; DE 3574072 T 19850806; ES 297044 U 19860617; JP 15812786 A 19860707