| 摘要 |
<p>IMPROVEMENTS IN OR RELATING TO PRINTERS A mechanism for a matrix printer has a robust single turn closed loop transformer secondary winding 3 as the moving part for driving a print stylus 9 into and out of a print position. Each secondary loop threads a transformer core 1 on which is wound a multi-turn primary winding 2. A stack of such secondary loops, arranged with print styli 9 in a closely spaced print row across the stack are supported in a static magnetic field produced by a magnetic assembly 10. Energization of a primary winding 2 induces a large current flow in its secondary loop 3 which reacts with the field to drive the associated print stylus 9 into the print position. In one embodiment, the stack of secondary loops are all mounted on a single pivot 6 and each swings about the pivot as a whole upon energization of its associated primary winding 2. In another embodiment each secondary loop of the stack is formed so as to be elastically deformable (Fig. 7) whereby a portion of the loop carrying the stylus 9 is deflected into the print position upon energization of its associated primary winding. UK9-78-016</p> |
