The Siruba 747DFT top feed 4 thread overlocking machines are versatile enough to seam difficult garment materials such as piping inserting on garment seaming or heavy weight materials in lightweight foams, upholstery materials, curtains and products that require additional feeding capability. The machine has both conventional front and rear lower feed dogs (feeding teeth) and an adjustable upper feed dog also to assist pull material into the stitching point. Both upper and lower feeds have differential adjustment to assist with achieving flat seams. The machine is usually supplied with heavy duty sewing bench and clutch motor. Optional devices included fully submerged sewing bench, rear fabric puller and electronic needle position servo motor.