Siemens Aktiengesellschaft

Dietmar Pohlig

Ernst Goepel

The monitoring of the ink supply in an ink reservoir occurs by measurement and evaluation of the change in resistance between two electrodes situated in the inside of the ink reservoir, the one electrode being formed by the hollow needle which produces a flow connection between the ink reservoir and ink supply system; the second electrode is formed as a needle and is situated in a wall of the reservoir and is arranged in an insulating ring which is formed by walls of the ink reservoir which are drawn up toward the inside.

Mechanism having ink reservoir with electrodes for ink monitoring in ink

A d.c. motor positions printing mechanisms. A circuit arrangement is provided in which a scanner disc, having peripheral slots, is arranged on the shaft of the motor and the slots are scanned by a scanner and counted in the positive direction and in the negative direction by a counter so that the position of the printing mechanism is determined. When the d.c. motor is decelerated and a generator voltage arises, the direction is determined by a rotation direction discriminator which evaluates the generator voltage and the zero transition thereof in the event of a change in the rotation direction of the d.c. motor. To control the direction of counting of the counter.

Circuit arrangement for positioning the printing mechanisms in printers

A circuit arrangement is disclosed which generates stepping pulses which will drive a stepper motor within its range of optimum load angle. The stepping pulses are formed by a few starter pulses which follow each other in short succession and a plurality of control pulses which are always initiated as soon as the rotor of the stepper motor has turned by one stepping angle. In this particular fashion the acceleration of the stepper motor is accomplished with maximum dynamic torque.

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Munich, Germany

Dietmar Pohlig