Tensioning shaft of film coating machine

The utility model relates to a tensioning shaft of a film coating machine, which comprises a rotating shaft. A three-jaw chuck seat is arranged on the rotating shaft. Three-jaw guide blocks are arranged on the three-jaw chuck seat. Tightening blocks are fixed on the three-jaw guide blocks. The technique of a three-jaw chuck on a lathe is used in the tensioning shaft and arc-shaped tensioning blocks are added on the external sides of the three jaws of the three-jaw chuck. By adopting the technical scheme, since the three-jaw chuck is arranged on a tensioning seat, the tensioning blocks are arranged on the three-jaw chuck and are sheathed in grooves by using an outer hexagonal wrench, the tensioning and the loosening of the tensioning blocks are realized by turning a conical gear and the tensioning blocks are arc-shaped blocks and are in surface contact with the inner wall of a film roll shaft, the tensioning shaft of the film coating machine has the advantages that the tension of the three-jaw chuck is conveni