Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1987-06-08
1989-05-09
Sewell, Paul T.
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
101 9305, 335274, B41J 312
Patent
active
048284092
ABSTRACT:
A print head for a dot matrix printer comprises a housing (1) containing a number of actuators (2) driving a corresponding number of print wires (6). Each actuator (2) includes an actuating coil (11) wound around a yoke (10) fixed to the housing (1) and a pivotable armature (13) adjacent the yoke (10). The armature has one end pivotally connected to the housing by a hinge of rubber or rubber-like elastomeric material (26) and has its other end engaging the head of a print wire (6) so that, upon application of current to the actuating coil the pivotable armature (13) is attracted towards the yoke (10) and pivots about its one end causing its other end to drive the printwire (6) forwards. Preferably the pivoting armature (13) is formed by two separate parts, a soft iron pole piece (20) and an actuating finger (21). Preferably they are connected together by both a spot weld (22) and an adhesive. Preferably each actuator (2 ) also includes an adjusting screw (16) which bears against a damper (15). The dampers are formed by a number of side-by-side blocks (15) of rubber or rubber-like elastomeric material with the bocks (15) being joined to one another by a thin flexible membrane (33).
REFERENCES:
patent: 4084678 (1978-04-01), Reier
patent: 4136978 (1979-01-01), Bellinger
patent: 4230038 (1980-10-01), Hebert
patent: 4230412 (1980-10-01), Hebert
patent: 4367962 (1983-01-01), Garboardi
patent: 4403875 (1983-09-01), Asano
Bowsher Richard
Butler Stephen
Sparshott John
Russet Instruments PLC
Sewell Paul T.
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