This machine is suitable for sewing tent, car seat, cushions, chair covers, sofa, canvas, hand bags, gloves and general leather products with large rotary hook todecrease bobbin change frequency; auto-ubricated with double fot presser, upper and lower feeding mechanism to prevent unbalance and cransfomaton, Linktake-up, link feed mechanism. Low noise, easy maintenace and minor difference between forward stitch and reverse stitch.