Apparatus for driving pulse motors for automatically adjusting external circuits

An apparatus for driving pulse motors for automatically adjusting external circuits comprising:

• a plurality of rotation direction switching circuits each having a first control terminal and a second control terminal;
• pulse motor means including a plurality of pulse motors connected to the respective rotation direction switching circuits and a plurality of driven devices connected to the respective pulse motors for adjusting said external circuits, each of said pulse motors rotating in one direction when a control signal is supplied to said first control terminal of the corresponding rotation direction switching circuit and rotating in the reverse direction when said control signal is supplied to said second control terminal of the corresponding rotation direction switching circuit;
• measuring means adapted to be connected to said external circuits for measuring the outputs of said external circuits;
• a plurality of digital comparators connected to said measuring means, for comparing output data of the measuring means with predetermined data and for delivering logic outputs through first output terminals thereof when the output data of the measuring means is greater than the predetermined data, through second output terminals thereof when the output data of the measuring means is smaller than the predetermined data and through third output terminals thereof when the output data of the measuring means is substantially equal to the predetermined data, said first output terminals connected to the respective first control terminals and said second output terminals connected to the respective second control terminals;
• a pulse generating circuit for generating drive pulses to drive said pulse motors;
• gate circuit means connected to said pulse generating circuit and the digital comparators, for individually inhibiting said drive pulses from being supplied to the pulse motors when receiving predetermined logic outputs from the third output terminals;
• and
• control circuit means connected to the said gate circuit means for outputting a stop signal when receiving the predetermined logic outputs from the third output terminals so as to turn off the gate circuit means, whereby automatic adjustment of said external circuits is stopped.