Telegraphy – Systems – Printing
Patent
1980-04-24
1982-02-16
Robinson, Thomas A.
Telegraphy
Systems
Printing
361155, H04L 2100, B41J 910, H01H 4732
Patent
active
043160565
ABSTRACT:
A control circuit for momentarily energizing an electromagnetic coil in a teleprinting device recorder has a pair of switching transistors respectively operated by control pulses having a lag between respective switching times and a control transistor biased by a single operating voltage source. When a first of the switching transistors is switched on a rapid current rise in the coil takes place for immediate and rapid activation of the coil plunger which is followed by a maintenance time during which the first switching transistor is either switched off or is in pulsed operation and also during which the energy stored in the electromagnetic coil serves as the maintenance current source, which is followed by switching on of the second control transistor. By the addition of a diode between the coil and the operating voltage source, a feedback circuit is formed so that after disconnection of the electromagnetic coil, the energy stored in the coil is fed back into the operating currents supply network.
REFERENCES:
patent: 3021454 (1962-02-01), Pickens
patent: 3549955 (1971-04-01), Paine
patent: 3582981 (1971-06-01), Dalyai
patent: 3786344 (1972-10-01), Davis et al.
patent: 4091235 (1978-05-01), Nijenhuis
Robinson Thomas A.
Siemens Aktiengesellschaft
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