PC6-9 HIGH-SPEED HEAVY DUTY SEWING MACHINES IS APPLIED TO SEWING JEANS, TENTS, SEAT CUSHIONS, LEATHER ETC. MODE PC6-9, WITH THE ADOPTION OF AUTOMATIC SILICON-OIL THREADS LUBRICATING SYSTEM WHICH GUARANTEES THE STABLE SEWING PERFORMANCE, HIGH EFFICIENCY AND EXCELLENT QUALITY. EQUIPPED WITH BIG ROTARY HOOK AND SELF LUBRICATING SYSTEM TO REDUCE BOBBIN CHANGING AND STRENGTHEN THE DURABILITY OF THE HOOK AND OTHER EASILY DAMAGED PARTS.