Technical features: the upper and lower feeding lockstitch sewing machine for heavy material uses the upper and lower feeding teeth to feed materials, which can make the feeding quantity of the upper and lower layers reach the same level in the sewing process for the expanded sewing materials and the medium thick materials with large potential displacement; the big hook is adopted to reduce the times of changing the bottom thread and improve the working efficiency; the full-automatic lubrication device is adopted to improve the service life of the machine.
Product performance: the machine adopts connecting rod take-up, big hook, automatic lubrication system, equipped with up and down feeding mechanism and presser foot alternating lifting mechanism. It is suitable for leather, leatherette, canvas, cushion, sofa, bags and so on.
Max. sewing speed: 2,000 stitches per minute
Max. stitch length: 9mm (forward/backward)
Needle bar stroke: 36.5mm
Lift of the presser foot by hand: 5.5mm
Lift of the presser foot by knee: 15mm
Thread take-up: Link type
Alternating vertical movement: 2～5mm
Hook: Horizontal-axis full-rotary double-capacity hook
Needle: (at the time of delivery) DP×17 (#21) #14～#23＊
Thread: #40~#8, B33~B92, Nm=90/3~30/3
Pitch changing method: By dial
Knee-lifter mechanism: Built on the machine head
Foot lifting clearance (1/4") By hand By knee 1/2" - Sew material up 3/8" thick.
Lubricating: MACHINE OIL No.7 (equivalent to ISO VG7)
Distance from needle to machine arm: 261mm