Labeling machine

1. A labeling machine comprising: a device for applying labels to containers to be labeled, said application device being fed by a feeding unit supported by a base frame and comprising at least one device for supporting a spool of a film of labels which is arranged around a hollow tubular body, wherein said supporting device comprises at least one base body supported by said base frame and an elongated body which can be associated removably with said base body by virtue of removable connecting means, said elongated body being insertable into said hollow tubular body of said spool when separated from said base body, locking means being further provided which are adapted to lock said elongated body in said tubular body with said elongated body separated from said base body, wherein said elongated body comprises a grip portion adapted to allow the movement of said spool for the movement of said spool with respect to said feeding unit, wherein said locking means comprise at least one expandable portion of the outer surface of said elongated body that can expand in a radial direction in order to lock onto the inner surface of the respective tubular body, wherein said locking means comprise an actuation body connected kinematically to a supporting body of said at least one expandable portion, said actuation body being movable with respect to said supporting body along an actuation direction in order to cause an expansion of said at least one portion of the outer surface of said elongated body, wherein said actuation direction extends substantially parallel to an axis of said elongated body, a movement of said actuation body in the direction away from a first end of said elongated body causing the expansion of said at least one portion of the outer surface of said elongated body.

2. The labeling machine according to claim 1 , wherein said actuation body defines said grip portion.

3. The labeling machine according to claim 1 , wherein said base body comprises a supporting element for said spool.

4. The labeling machine according to claim 3 , wherein said supporting element comprises a plate that lies, during use, on a substantially horizontal plane.

5. The labeling machine according to claim 1 , wherein said removable connecting means comprise at least one engagement body defined on said base body and at least one abutment body defined substantially at a first end of said elongated body.

6. The labeling machine according to claim 1 , wherein said actuation body is arranged at the end of said elongated body that lies opposite a first end of said elongated body.

7. The labeling machine according to claim 1 , wherein said grip portion is adapted for coupling to movement devices.

8. The labeling machine according to claim 1 , further comprising, between said supporting body and said actuation body, a preloading element adapted to apply a force, between said supporting body and said actuation body, that is aimed at expanding the at least one expandable portion in a radial direction.

9. The labeling machine according to claim 8 , further comprising means for retaining said actuation body in a closer position with respect to a first end of said elongated body, said retention means being adapted to contrast the effect of said preloading element so as to keep said portions in a non-expanded or retracted position.