Group supply a packaging web from a coil with a coil for changing automatic packaging machines objects

摘要

Group supplying a packaging web from rolls, with an automatic reel change, for a machine for packaging articles, comprising: a supply track (13) along which runs the packaging web to use area (45) thereof; means for transversely (14) cutting the strip (11) arranged at the beginning of the supply path; means (17A) for supporting a first bobbin (12A) of the strip (11A) of material thin packaging and means (17B) for supporting a second bobbin (12B) of the band (11B) of material fine packaging; a first input track (20A) of the first web (11A) of the first coil (12A) to the supply path (13); a second input track (20B) of the second web (11B) of the second coil (12B) to the supply path (13); a first advancing means (21A) for inserting or removing the front end of the first strip (11A) or the supply path (13); a second feed means (21B) for inserting or removing a front end of the second band (11A) or within the supply path (13); so that, while a band (11) is in a use state, the other band (11) is stationary with a front end thereof disposed at an inlet to the supply path (13) and also when the coil (12A, 12B) supplying the band (11) ends, the band (11A, 11B) is cut and the advancing means (21A, 21B) are activated to extract a front end of the cut band the supply path (13), while the other feed means (21B, 21A) are activated to push a front end of the other band (11B, 11A) in the supply path (13), characterized in that the first advancing means (21A) and second advancing means (21B) comprise a middle pinch roller (22) driven in two directions and two rollers side opposed free rotation (23a, 23b) which can zoom in and out reciprocally accordance with a command from the central roller (22), each of the two opposed rollers freewheeling side (23a, 23b) for pressing a respective web (11) against the central roller (22).