| 摘要 |
PURPOSE:To simplify the logic thus to reduce the cost by providing a three-bit reversible shift registor and a inverter thereby eliminating the initial setting function. CONSTITUTION:When resetting the reversible shift register 34 by the rest signal 33 then shifting the mode switching signal 31 to the positive, the positive shift input 39 is at first ''1'' because 37 is ''0'' thereby 35 goes to ''1'' at the first pulse in the shift pulse signal 32 while 36 goes to ''1'' at the second pulse and 37 goes to ''1'' at the third pulse. Signals 35-37 hole ''1'' during three pulses. Signals 35-37 are applied through inverters 43, 44, inverting amplifiers 45-47 on the first, second and third phases in the pulse motor PM. When reversing the rotation the mode switching signal 31 is switched to the reverse shift. |
