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High speed top and bottom feed sewing machine for heavy material, the top and bottom feed mechanism has good durability and stable feed feature. Gear pump oiling system ensures the thorough lubrication even when the machine runs at low speed. It adopts link type thread take-up and automatic lubrication rotating hook catches thread. The slippage between material layers can be avoid thanks to the top and bottom feed mechanism. The lock device of needle gauge scale ensures the stitch length keeps unchanged at sewing. The needle spacing can be adjusted to ensure the spacing consistency and the beautiful stitch.