Devices, methods and systems disclosed herein relate to the application of a protective film on a surface of an electronic device that instantly reduces air bubbles and eliminates the waiting time usually required when using a wet fluid solution. In one embodiment, a flange may be configured to couple to the protective film. The flange may aid in the accurate application of the protective film to the electronic device.

An automatic welding machine, comprising a supporting frame and a tensioning device for reversibly joining at least two opposing booms to one another and applying a tension force between these, having an open position in which the opposing booms are separated from one another by a gap and a closed position in which the opposing booms are joined to one another and braced with respect to one another. One boom is mounted in a torsion-proof manner on the tensioning device and is pivotable in relation to the other boom and can be moved out of the open position into the closed position by the pivoting of the tensioning device. The tension force is generated by way of a spring-loaded element disposed on the tensioning device, wherein the spring-loaded element, at one end, is rigidly connected to a supporting element of the tensioning device and, at the other end, is pivotably mounted on the supporting frame by way of a double swivel joint, and the spring-loaded element is tensioned by the pivoting of the double swivel joint out of the open position into the closed position, whereby a torque is applied onto the pivotable boom.

According to one aspect of the present invention, an adhesive sheet material application device is disclosed, which includes a roller support bar, a handle, and a roller, where the handle and the roller are connected to the roller support bar, a portion of the handle is parallel to the roller, and the roller is rotatable. In another aspect of the present invention, a second handle is connected to the roller support bar and the second handle has a strap. According to another aspect of the present invention, a method of using the adhesive sheet material application device is disclosed, which includes securing a portion of adhesive sheet material to a surface, applying the adhesive sheet material to the surface with the adhesive sheet material application device, and regressing and eradicating bubbles between the adhesive sheet material and surface.

According to one aspect of the present invention, an adhesive sheet material application device is disclosed, which includes a roller support bar, a handle, and a roller, where the handle and the roller are connected to the roller support bar, a portion of the handle is parallel to the roller, and the roller is rotatable. In another aspect of the present invention, a second handle is connected to the roller support bar and the second handle has a strap. According to another aspect of the present invention, a method of using the adhesive sheet material application device is disclosed, which includes securing a portion of adhesive sheet material to a surface, applying the adhesive sheet material to the surface with the adhesive sheet material application device, and regressing and eradicating bubbles between the adhesive sheet material and surface.

Devices, methods and systems disclosed herein relate to the application of a protective film on a surface of an electronic device that instantly reduces air bubbles and eliminates the waiting time usually required when using a wet fluid solution. In one embodiment, a flange may be configured to couple to the protective film. The flange may aid in the accurate application of the protective film to the electronic device.

A roller including a core portion having a cylindrical shape, a support portion located on a central axis of the core portion and configured to rotatably support the core portion, a foam body covering an entire circumference of the core portion and including an outer circumferential surface being flat, an operation portion configured to operate the foam body, and a fixing portion configured to fix the support portion and the operation portion, wherein at least one of end portions of the outer circumferential surface bends toward a direction of the central axis.