Patent ID: 7033310

Claim:
A unit for processing a web of packaging material for producing sealed packages of pourable food products, said unit comprising: at least a first station for forming a number of through holes in said web; a second station for sealing said holes by applying respective opening devices by which to open the packages; a feed device for step feeding said web along a path through said first station and said second station; a position sensor generating a presence signal indicating the passage, past the sensor, of reference elements on said web; control means for controlling said feed device in response to said presence signal; wherein said reference elements bear a predetermined relationship with said holes in said web; and actuating means cooperating with said second station to move the second station in a direction parallel to said path, said actuating means being activated by said control means to adjust the position of the second station relative to a respective hole as a function of said presence signal, each time that a hole passes the position sensor, to compensate for a positional error of the respective hole so that a respective opening device is applied over the respective hole.