Telegraphy – Systems – Printing
Patent
1977-03-31
1978-05-23
Robinson, Thomas A.
Telegraphy
Systems
Printing
101 9302, 178 30, H04L 2100, B41J 910
Patent
active
040912353
ABSTRACT:
A printer, comprising a printing element which, when in operating position, is placed in a magnetic field, and is connected to a secondary winding of a transformer. This transformer has two additional secondary windings and two primary windings which are connected to a circuit so arranged that after a start pulse, two current pulses of opposite directions are successively supplied to the transformer of which only the second pulse effects movement of the printing element. The two primary windings are each connected to an amplifier, each of which supplies one of the current pulses. The input of the circuit and the amplifiers are coupled in such a way that the start pulse controls one of the amplifiers which in turn, through the two additional secondary windings and a blocking circuit, controls the other amplifier to produce the second pulse. This magnetizing of the iron in the transformer first in one direction and then in the other enables a greater change of flux to be realized with a relatively weak magnetizing current.
REFERENCES:
patent: 3741113 (1973-06-01), Mako et al.
patent: 3952153 (1976-04-01), Nijenhuis et al.
De Staat der Nederlanden, te Dezen Vertegenwoordigd Door de
Kirk Hugh Adam
Robinson Thomas A.
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