In addition to what described for the PTT-100 model, this double position machine PTT-200 allows one single operator to work on two tubular fabric lines. These two positions, single operator machine expands the out-put capabilities because while one fabric roll end sewn to the other unwinds on the cradle, the operator is able to work on the other sewing station arranging the second fabric line. This machine and the PTT-100 model as well, can use two alternative over lock stitches: one rolled stitch, three threads or one flat stitch, two threads