Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1980-10-27
1983-11-08
Truhe, J. V.
Electricity: motive power systems
Open-loop stepping motor control systems
318685, 400163, H02K 2904
Patent
active
044144962
ABSTRACT:
An electronic typewriter comprising: a keyboard having a plurality of keys and generating an encoded signal in response to the depression of each key; a printing unit having a print wheel with a plurality of type elements disposed around the periphery thereof, a step motor for rotating the print wheel, a print hammer for impacting the type element brought to a printing position, an ink ribbon, and a ribbon drive mechanism for bringing the ink ribbon to the printing position; and an electronic control circuit for coupling the keyboard to the printing unit. The electronic control circuit controls the rotation of the step motor according to the encoded signal received from the keyboard so as to bring a type element selected by the encoded signal to the printing position within a short time for executing quicker printing, and further controls the action of both the print hammer and the ribbon drive mechanism in response to the rotation of the step motor.
REFERENCES:
patent: 3328658 (1967-06-01), Thompson
patent: 3636429 (1972-01-01), Jakubowski et al.
patent: 3746958 (1973-07-01), Leenhouts
patent: 4025837 (1977-05-01), Meier et al.
Hirayama Takanobu
Inukai Yukio
Mizuno Kenji
Watanabe Tomoyoshi
Yoshimura Motokazu
Bergmann Saul M.
Brother Industries Ltd.
Oujevolk George B.
Truhe J. V.
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