Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1981-05-27
1983-05-10
Sewell, Paul T.
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
101 9305, B41J 312
Patent
active
043827012
ABSTRACT:
A wire matrix printing head moveable along a printing line on a record medium is described in which a ring of wire-selection electromagnets are grouped about the wire guiding arrangement, the electromagnets each having a basic yoke assembly with a pair of limbs each able to support a separate energising coil. The electromagnet armatures are supported by a common frame having a plurality of finger-like structures, one for each armature, on which the armatures are respectively pivoted. The printing wires are spring loaded into their restored positions and abut their respective armatures, which are supported in their respective unoperated positions each by an adjustable resilient backstop. The printing wires are supported in guides so that they are arranged in two columns, both the columnar pitch and the pitch of nominally adjacent wires in the columns being of the order of the wire diameter. Control of wire selection from the two columns is arranged to prohibit a further selection of any one wire for printing unless the printing head has moved along the printing line for a distance equal to twice the columnar pitch.
REFERENCES:
patent: 3434413 (1969-03-01), Lee et al.
patent: 4051941 (1977-10-01), Hebert
patent: 4079824 (1978-03-01), Ku
patent: 4140406 (1979-02-01), Wolf et al.
patent: 4165940 (1979-08-01), Cacciola
patent: 4167342 (1979-09-01), Mower et al.
patent: 4258623 (1981-03-01), Barrus et al.
International Computers Ltd.
Sewell Paul T.
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