US 9156236 B2 abstract a vacuum powered film applying mechanism for applying a flexible film to a workpiece includes a bracket a suction member and a rotating joint the suction member is rotatably mounted on the bracket and defines a peripheral surface and a plurality of suction chambers therein and by virtue of a vacuum created in the interior of the suction member a length of flexible film is attracted and adhered the rotating joint on the bracket communicates with the plurality of the suction chamber through the rotating joint air is supplied and exhausted from the plurality of suction chambers progressively on a one by one basis to pick up and roll the flexible film onto itself and by supplying air to the plurality of suction chambers one by one unrolls and releases the flexible film onto the workpiece with a low incidence of trapping air bubbles application_number US 201313959741 A description referring to fig1 an embodiment of a vacuum powered film applying mechanism 100 includes a bracket 10 a suction member 20 a rotating joint 30 and an adjusting assembly 40 the suction member 20 is rotatably mounted on the bracket 10 the rotating joint 30 is rotatably mounted on the bracket 10 adjacent to the suction member 20 the rotating joint 30 is connected to the suction member 20 for supplying and extracting air from the suction member 20 the adjusting assembly 40 is mounted on the bracket 10 and resists the suction member 20 to provide a rotational resistance force against the suction member 20 also referring to fig2 and 3 the.