Wrapping device with a circular track structure, and a film feeding device

A film feeding device for a wrapping device, wherein the film feeding device comprises at least:

• means for fixing a film roll in the film feeding device in a rotating manner,
• feeding means, through which the film is arranged to be fed at a predetermined film tension around a piece to wrapped, and
• a drive mechanism which is arranged, if necessary, to rotate the film roll in a direction, in which the film is rewound on the film roll and which is arranged to receive its driving force by means of a mechanical contact which is between the drive mechanism and the circular track structure, when the film feeding device is further arranged in the wrapping device and is arranged to move along a track arranged in the wrapping device,
• a mechanism 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 on said track, or on the basis of them both.

A wrapping device comprising at least a circular track structure which forms a closed track, and a film feeding device which is arranged to circulate along said track and to feed a film around a piece to be wrapped, wherein the film feeding device is provided with at least:

• means for fixing a film roll in the film feeding device in a rotating manner,
• feeding means, through which the film is arranged to be fed at a predetermined film tension, and
• a drive mechanism which is arranged, if necessary, to rotate the film roll in a direction, in which the film is rewound on the film roll and which is arranged to receive its driving force by means of a mechanical contact between the drive mechanism and the circular track structure,
• a mechanism which is arranged to disconnect and reconnect said contact, wherein said mechanism is controlled on the basis of the film tension.