Pulse motor drive systems

Claim 1

A pulse motor drive system for controlling the direction of rotation of a pulse motor having a plurality of driving coils comprising a plurality of flip-flops capable of changing output signals thereof in accordance with input signals supplied to said flip-flops, each one of said flip-flops being provided with a pair of input terminals and at least one output terminal, the number of said flip-flops being twice the number of said driving coils; a plurality of gate circuits interconnecting said flipflops in ring formation and being responsive to output signals from the output terminals of each flip-flop to supply input signals to the input terminals of the next successive flip-flop in accordance with said output signals from the next preceding flip-flop; conductors connected to said output terminal of alternate ones of said flip-flops to supply output signals from said last-mentioned output terminals to said driving coils of said pulse motor; a reset conductor connected to each of said flip-flops for setting a first half of said flip-flops and for resetting a second half of said flip-flops upon the occurrence of a reset signal; a trigger input conductor connected to supply trigger pulses to each of said flip-flops to switch output signals of a flip-flop in said first half and a flip-flop in said second half; a forward signal input conductor connected to said gate circuits to supply a signal for commanding forward rotation of said pulse motor; and a reverse signal input conductor connected to said gate circuits to supply a signal for commanding reverse rotation of said pulse motor.