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Heavy duty two needle double locked stitchsewing machine with top and bottom feed. Universally applicable for all seamson container bags, inserting top covers and attaching filling and dischargingtubes on container bags. Easy crossing of side seams and belts. Upper feeddrive in housing, therefore maximum capacity under the arm.Electro-pneumatically operated presser foot and upper feed dog lifter.Pneumatic presser foot spring. Guides for filler cord from the top and / orbelow for sealing the needle punctures. With built-in elctro-pneumaticallyoperated hot thread chain cutter left of the needle from below for separatingthe thread chain.