| 摘要 |
PURPOSE:To achieve a highly reliable position control with a simplified mechanism by converting a signal from a magnetic sensor into a rotary position feed back signal when the sensor detects the passage through a ferromagnetic film provided at a finger section of a type wheel. CONSTITUTION:When the rotary position of a type wheel 1 connected to a pulse motor 4 is controlled with a closed loop, a magnetic film 8 made of a ferromagnetic material is provided at a finger section 2 thereof and is detected with a magnetic sensor 9. The output signal of the sensor 9 is input into a pulsation circuit 7 as a rotary position feed back signal of the type wheel to obtain a position pulse train signal. This allows the formation of a closed loop as shown in the drawing. |
