Unwinding apparatus for wrapping machine
AssigneeAetna Group S.P.A.
InventorMauro Cere′
Life of this patent
Estimating the term…
Abstract
An unwinding apparatus (1) for wrapping machine (100) to wrap with a film (50) a load (30) on a pallet (40), comprising supporting means (2) for supporting a reel (60) of film (50), roller means (3, 4, 7) for unwinding and pre-stretching the film (50) and a guiding roller (6) that can be tilted for reducing a band width of the film (50) and/or deviating it towards the; first driving means (10) for continuously tilting the guiding roller (6) in a plurality of operating positions (P0, P1, P2) along an adjustment stroke; the guiding roller (6) comprises a first end portion (16) rotatably connected to the supporting means (2) and provided with a roll (8) able to roll up a longitudinal lower edge (50a) of the film (50) when the guiding roller (6) is tilted to form a longitudinal rolled portion (51).
Claims18
An unwinding apparatus associable with a wrapping machine for wrapping with a film of plastic material a load positioned on a pallet, the unwinding apparatus comprising:
- a supporting arrangement for supporting a reel of the film;
- a roller assembly fixed to said supporting arrangement and arranged for unwinding and pre-stretching the film;
- a guiding roller for engaging and deviating towards the load the film leaving said roller assembly, said guiding roller being rotatably mounted on said supporting arrangement so as to be tiltable with respect to longitudinal rotating axes of said roller assembly, so as to reduce a band width of the film wrapped around the load and/or deviate the film towards the load and a supporting plane adapted to support the load;
- and
- a first driving device for tilting said guiding roller, wherein
- said first driving device is configured to tilt said guiding roller continuously in a plurality of different operating positions along an adjustment stroke between an initial operating position, in which said guiding roller is substantially parallel to the longitudinal rotating axes and does not reduce a band width of the film nor deviate the film towards the supporting plane, and a first operating position in which said guiding roller is tilted by a first angle with respect to the longitudinal rotating axes to reduce the band width of the film and/or deviate the film towards the supporting plane and the load,
- said guiding roller comprises a first end portion rotatably connected to said supporting arrangement and provided with a roll, coaxial and rotatable with said guiding roller and provided with a groove able to abut and partially roll up a longitudinal lower edge of the film leaving said roller assembly when said guiding roller is tilted so as to form a longitudinal rolled portion,
- the groove of the roll has a rounded bottom surface, and
- an external cylindrical surface of the guiding roller is continuously smooth from the groove to a second end portion of the guiding roller.
Dependencies are inferred from the claim text.