in radians one thread take up timing pulse sg 5 is generated by the generator 41 a drive control circuit enclosed in the sewing machine will now be described by referring to the block diagram of fig3 in fig3 a micro computer 42 is composed of a central processing unit cpu a read only member rom and a random access memory ram the cpu provides a control signal to a motor drive circuit 43 in accordance with a control program stored in rom and in response to both the on signal of switch 16 and the speed setting signals from switches 9 10 11 for controlling the drive motor 44 at the selected rotational speed the cpu also acts in sequential response to rising and falling of the signal sg 2 from the pulse generator 24 for sequential read out from rom of data representing the bight and feed for each stitch pattern selected by a switch 14 and for providing such data to a bight drive circuit 45 and a feed drive circuit 46 a bight actuator 47 for the lateral jogging mechanism and a feed actuator 48 for the work feeding mechanism determine for each stitch the jogging position of the needle 17 and the position of a regulator for setting the feed amount and the feed direction of the feed dog the cpu also provides a pattern indication signal to an led 13 of a pattern indicating device 49 in accordance with the pattern selection signal provided by the selected switch 14 for lighting the led.