Device for eliminating the trailing end that is formed in the film coming off wrapping machines for wrapping palletized loads when the reel of film is replaced

A device for eliminating the trailing end of the film that is formed on wrapping machines for wrapping palletized loads when the reel of film is replaced, said device being of the type in which the wrapping machine is equipped with:

• a first, reel-holder, assembly, constituted by pre-stretching rollers driven by motor means, return idlers and a compensator arm;
• and
• a second, welding, assembly constituted by a gripper, welding means, and cutting means;
• the film sliding between the reel, said first assembly and said second assembly, and the load set on the pallet;
• the device being wherein positioned between the reel and the first assembly is a mobile unit provided with a re-winding roller designed to press on the reel in operating conditions;
• there being moreover provided actuator means governed by sensor means for detecting running-out of the reel or governed by manual means for intervening in the event of defectiveness or tearing of the wrapping film, which determine execution of the following operations:
• cutting and welding, by said second assembly, of the trailing end of the film on the palletized load that has been wrapped, with completion of the wrapping cycle and release of the cut-away end of the wrapping film by opening of said gripper;
• said displacement of the winding roller so that this presses against the reel;
• reversal of the direction of advance of the film along the path between the reel and the second assembly via reversal of drive of the motor means that draw the film along said path;
• and
• rotation of the re-winding roller in the direction that determines re-winding of the reel on which the roller presses.