NUMERICAL CONTROLLER

PROBLEM TO BE SOLVED: To improve the precision of a numerical controller of machine tool, by always maintaining the output timing of control data to a machine tool constant with a simple outside circuit. SOLUTION: An interrupting pulse outputted from a frequency-divider 32 is inputted to a set terminal S of a flip flop 22, and the flip flop 22 maintains a set state and holds a Q terminal to be an 'H' level until the interrupting pulse to be outputted next from the frequency-divider 32 is inputted to a reset terminal R. An AND circuit 23 outputs the clock pulse of a clock generator 31 to a counter 24 which the Q terminal of the flip flop 22 is the 'H' level. The counter 24 counts the clock pulse of the clock generator 31 since the interrupting pulse of inputted to the set terminal of the flip flop 22. This counting is compared with delay data set in a delay register 25 by a comparator 26, and when they are coincident, control data are outputted from a two-stage register 27.