Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1983-03-28
1985-02-12
Sewell, Paul T.
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
101 9301, 101 9305, 4001572, 400166, B41J 312
Patent
active
044987919
ABSTRACT:
A multicopy impact printer has a wire matrix stored energy printhead having circuitry for reducing the power requirement of the printhead. A permanent magnet is incorporated in the printhead to flex leaf springs each of which is attached to the corresponding activation end of a respective one of a plurality of print members. A coil is provided for each print member, being activated when selected, to provide a magnetic field in opposition to the magnetic field of the permanent magnet and of an amplitude sufficient to release the flexed leaf spring. The opposing field diverts the field of the magnetic coil into paths away from the activated coil, thereby increasing its intensity and requiring more current in other selected coils to release the corresponding flexed leaf springs. A common coil is connected at one end to one end of each of the printer element coils and wound and positioned to provide a field in opposition to that of the permanent magnet. Currents in the respective selected printer element coils add in the common coil so that the magnitude of the opposing field is dependent upon the number of selected print element coils.
Devine Thomas G.
Heiting Leo N.
Sewell Paul T.
Sharp Melvin
Texas Instruments Incorporated
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