The present invention is directed to a control system device that forces a machine operator to comply with the regulation by not allowing the machine to operate until the maintenance log has been completed. Discarded sand is supplied as supplementary sand to a sand processing line, so that molding sand can be recycled. A plurality of regions in which the at least one object is detected, is determined from the images. In each knitting process, knitting of one course is started from a part inside an end part of the knitting width of a front side knitted fabric by using a back side yarn feeding member, and while connecting the knitting start point and the knitting end point of the course so as to form a tubular shape, turn-back knitting is performed to the next course.