Patent ID: 8602281

Claim:
A device for driving at least one printing web to be used in a rotary press comprising: a first rotating roller including a first shaft having a first axis of rotation, a first gripping cylinder and a second gripping cylinder mounted on the first shaft, a width of the first gripping cylinder being less than a width of the second gripping cylinder; a second rotating roller including a second shaft having a second axis of rotation, a third gripping cylinder and a fourth gripping cylinder mounted on the second shaft a width of the third gripping cylinder being greater than a width of the fourth gripping cylinder; the first and second rollers being counter-rotating rollers, the first and second axes of rotation being substantially parallel, the two counter rotating rollers gripping the at least one web to cause the at least one web to move along as a result of the rotation; the first and third gripping cylinders contacting the web therebetween and defining a first gripping zone, the second and fourth gripping cylinders contacting the web therebetween and defining a second gripping zone the web being gripped only in the gripping zones; an entirety of the first or second rotating roller displaceable relative to an entirety of the second or first rotating roller, respectively, in a direction of the axes of rotation, the displacement of the entirety of the first rotating roller displacing both the first and second gripping cylinders, the displacement of the entirety of the second rotating roller displacing both the third and fourth gripping cylinders, the displacement of the first or second roller modifying a distance between the first and second gripping zones, a first width of the first gripping zone and a second width of the second gripping zone being maintained when the distance between the first gripping zone and second gripping zone is modified at least over a range of adjustment.