EP 0189568 A1 19860806 - Print hammer and drive for daisy wheel printer.
Title (en)
Print hammer and drive for daisy wheel printer.
Title (de)
Druckhammer und Antrieb für Typenraddrucker.
Title (fr)
Marteau d'impression et entraînement pour imprimante à roue porte-caractères.
Publication
Application
Priority
US 69559885 A 19850128
Abstract (en)
A printing mechanism is disclosed which has an oscillatable hammer (34) which carries on the first end an impacting surface (32) for striking a printing element (50) and on the opposite end thereof, a magnetically attractable armature structure (24) generally formed in a U-shape such that the legs of the U extend in a plane perpendicular to the axis (36) of oscillation. An electromagnet assembly (10) is fabricated to mate with and accept the legs of the hammer armature (24) between similar U-shaped legs (16) of the electromagnet armature (14) to provide a substantially constant air gap during the movement of the hammer armature (24) into the magnetic field of the magnet armature (14). The electromagnet (10) may be enhanced by providing a flux concentrating core member (18) magnetically coupled with and surrounded by the coil (22) of a magnet thereby concentrating the flux flow through small air gaps into which the legs of the U-shaped hammer armature (24) may be attracted.
IPC 1-7
IPC 8 full level
B41J 9/127 (2006.01); B41J 9/06 (2006.01); B41J 9/38 (2006.01); B41J 9/44 (2006.01)
CPC (source: EP)
Citation (search report)
- US 3714892 A 19730206 - PERRY R
- US 4004505 A 19770125 - MAGNENET JEAN GEORGES
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
DOCDB simple family (application)
EP 85115703 A 19851210; JP 25300385 A 19851113