A WRAPPING DEVICE WITH A CIRCULAR TRACK STRUCTURE, AND A FILM FEEDING DEVICE

摘要

A wrapping device comprising at least a circular track structure (3) which forms a closed track, and a film feeding device (1) which is arranged to circulate along said track and to feed a film (9) around a piece to be wrapped, wherein the film feeding device (1) is provided with at least means for fixing a film roll (8) in the film feeding device (1) in a rotating manner, feeding means (12, 13, 14, 15), through which the film (9) is arranged to be fed at a predetermined film tension, and a drive mechanism (16, 17, 18, 19, 22) which is arranged, if necessary, to rotate the film roll (8) in a direction in which the film (9) is rewound onto the film roll (8) and which is arranged to receive its driving force by means of a mechanical contact (26) between the drive mechanism (16, 17, 18, 19, 22) and the circular track structure (3). The film feeding device (1) also comprises a mechanism (10, 11, 20, 23) which is arranged to disconnect and reconnect said contact, wherein said mechanism is controlled either on the basis of the film tension or on the basis of the location of the film feeding device (1) on said track, or on the basis of them both.