The carton former FS400 is a machine which automatically sets up folded cartons and puts together boxes with or without cover. It consists of a carton magazine unit equipped with an automatic arm which lifts cartons from the magazine by means of suckers and of a hot glue spraying device for gluing flaps. Once the carton is formed by means of a mould it is transported along a conveyor. Format change can be easily done by just regulating the special hand-wheels. The forming unit - consisting of one single part - has been constructed in order to avoid regulating operations.