Aeg Olympia Aktiengesellschaft

Ernst Kloppenburg

A method and means for producing a control voltage for controlling a direct current motor makes use of a tachometer voltage providing two ninety degree phase shifted tachometer signals. From these are derived four coding signals comprising the tachometer signals and their inverse signals. The four signals are combined to produce a triangular signal, which is differentiated. The differentiated signal and its inverse are applied through a switching circuit to produce a control signal.

Method and apparatus for producing a speed control voltage for direct

A plotting device for typewriters or office machines of similar construction which comprises a motor driven carriage; a record carrier; a print head; a ribbon in a cassette; a reversible, controllable drive motor for moving the record carrier up and down; the motor driven carriage being movable along the record carrier; the ribbon being housed within the carriage with a portion of the ribbon extending outside of the carriage for being contacted by the print head; the print head being operatively connected to the carriage so that the print head can strike the ribbon and produce a full set of alpha-numeric characters on the record carrier; an X-Y plotting mechanism equpped with styli and being disposed on the cassette; and a control system for moving the styli from a detent position into an operating position with respect to the record carrier.

Growing community of inventors

Grossefehn, Germany

Ernst Kloppenburg