Juki MF-7523-U11 3 Needle, 4 Thread Top and Bottom CoverHem Stitch Flatbed Interlock Sewing Machine, Assembled Power Stand, Servo Motor

Needle Bar Stroke Conversion Mechanism By changing over the needle bar stroke, penetrating force of the needle as well as thread tension to fit heavy-weight materials (fleece, blankets) can be obtained. The needle bar stroke can be changed by adjusting the eccentric pin. (Changing of parts is not required. Factory-set at the time of delivery: 31mm; for sewing heavy-weight materials: 33mm)