connected to the count up terminal up of the counter ct through an or circuit or1 so that the counter ct may advance the count each time a new unit of patterns starts to be stitched the and circuit and8 has another input connected to the output q of the monostable multivibrator mm1 so as to reset the counter ct through the or circuit or4 when the pattern selecting switch sw1 is operated after the controller switch sw5 is operated at the same time the latch circuit l2 latches the value 0 of the counter ct through the or circuit or2 and the monostable multivibrator circuit mm3 and the flip flop circuit ff1 is reset exclusive or circuits exor1 exor4 compare the output signal of the counter ct and the output signal of the latch circuit l1 with respect to the bits of these output signals if all the bits of the output signals are in accord with each other the exclusive or circuits operate a monostable multivibrator circuit mm6 through a nor circuit nor3 the output q of the monostable multivibrator circuit mm6 resets the counter ct through the or circuit or4 to thereby make 0 the pattern number progressing input terminal na of the pattern variation rate generating device pvg so as to meet the initial stitch of a combination of patterns referring particularly to fig5 and 6 the operation of the control circuit will now be explained if one of the pattern selecting switches sw1 is pushed a low level signal.