Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1980-11-06
1982-09-07
Sewell, Paul T.
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
101 9302, 4001572, 400167, B41J 310, B41J 784, B41J 942
Patent
active
043481191
ABSTRACT:
In a drive circuit for an electromagnetic printing element of an impact printer, a drive pulse drives the printing element from a backstop toward a record medium to print indicia. A voltage comparator senses the change in the induced voltage in the printing element when it impacts on the backstop for triggering a single shot circuit to apply to the printing element a damping pulse of a polarity such as to oppose its rebound from the backstop. A latch circuit is responsive to the damping pulse to disable the single shot circuit until the end of the next drive pulse. The drive and damping pulses are applied to the printing element through a bidirectional current source.
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Carson, Jr. Andrew B.
Hanger William A.
General Electric Company
Masnik Michael
Sewell Paul T.
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