Patent ID: 8002279

Claim:
A device for unloading laminar elements from a roll, and forming and transferring stacks of such laminar elements, comprising: a barrier located in the path of said laminar elements when they are transported by said roll, for unloading the laminar elements from the roll in an unloading area; a support for receiving in a stacked manner laminar elements unloaded and detained by said barrier forming a growing stack; a separator adapted for being moved from a retracted position to an extended position interposed between first and second adjacent laminar elements, where said first laminar element completes a finished stack on said support and said second laminar element is momentarily held by said separator in order to begin a new growing stack while said finished stack is taken off the support; a push element adapted for being moved from a retracted position to an extended position for pushing the finished stack and transferring it from the support to an outlet support; and support actuation means being provided to move said support away from said unloading area as the growing stack grows and adapted to maintain a predetermined pressure between a last laminar element of the growing stack and a cylindrical surface of the roll, the support being linked to a rod of a piston housed in a cylinder containing a compressible fluid in a chamber, and a detecting device is provided to detect a parameter representative of the pressure in said chamber, the detecting unit of said detecting device being connected with control means controlling the support actuation means for moving said support while maintaining said predetermined pressure.