Sheet stacking equipment

An equipment for stacking sheets comprising a stack support for vertically stacked sheets, a plurality of elongated conveyor belts having lower branches arranged above the stack support, wherein the conveyor belts are motor driven for dragging incoming sheets by suction via said lower branches and for depositing the sheets onto the stack support or onto already stacked sheets, and wherein the equipment further comprises a stopping member for the incoming sheets, a sensing device for sensing the height of the stacked sheets, a compensation mechanism for adjusting the height of the stack support as a function of the stacked sheets and an electronic control unit, and wherein the sensing device comprises:

• a series of sensing rollers interposed between the lower branches of the conveyor belts close to the stopping member, configured for cooperating with the stacking sheets in corresponding sensing areas;
• a series of sensing supports rotatably supporting said sensing rollers, said sensing supports being individually movable;
• a series of intermediate elements, arranged above the sensing rollers and configured for cooperating with said sensing supports;
• a common shaft angularly fixing the intermediate supports and being rotatable;
• and
• spring means configured for applying a tensioning action to the sensing supports via the common shaft and the intermediate elements so as to enable sensing of the sensing areas by the sensing rollers, wherein
• the sensing rollers and the respective sensing supports are liftable from the stacking sheet according to the thicknesses of the sheets in the sensing area,
• the intermediate elements are displaceable by the sensing supports with rotation of the common shaft in response to the lifting of the sensing rollers;
• and the sensing device provides the electronic control unit with information for controlling the compensation mechanism in response to rotation of the common shaft determined by greater lifting of the sensing rollers.