Abstract: A bag forming, filling and sealing machine is provided with a pull-off device for the packaging material, with a forming tube for forming and filling tube-like bags, with a longitudinal sealing device and with a cross sealing device, wherein the longitudinal sealing device is designed as an ultrasonic longitudinal sealing device integrated into the forming tube in order to seal the first and second longitudinal edges of the packaging material with one another into an overlapping sealing seam. Provisions are made for reliably guiding the mutually overlapping edges of a film forming the tube for the ultrasonic longitudinal sealing device to have a spring-loaded guide plate for guiding at least one edge of the packaging material.