Abstract: A supply device for a machine working cardboard sheets. At least one conveying unit for the conveyance one by one of the sheets. A hold-down stop for preventing conveyance of a pile of the sheets above the conveying unit while permitting conveyance of the bottom sheet. A plurality of rising units at the conveying unit, the raising units being alternatively moveable by pivoting between an upraised position above the upper level of the conveying unit, and a lowered position at the highest aligned with that upper level. Each rising unit is connected to a programmable control unit in order to provide a single command respectively for each one of the rising units. An adjustable height wear surface shoe on each rising unit.

Abstract: The supply device for a machine working cardboard sheets comprises at least one conveying unit for the conveyance one by one of said sheets, driving means (2) of said conveying units, at least one hold-down stop of a pile of said sheets above said conveying units and at least one raising unit (3) connected to each conveying unit, these raising units being alternatively movable between two restricted positions, one above the upper level of said conveying units, the other as they are aligned compared to this upper level. Each raising unit (3) is connected to a programmable control unit (T, C) in order to permit the single command of each one of said raising units (3).