Apparatus for stacked depositing and alignment of individually delivered sheets

Apparatus having alignment means for delivering, depositing, and aligning individual sheets in a collecting tray to form at least one sheet stack from sheets collected one on top of another, the collecting tray of which has a depositing surface with at least one front delimiter against which the sheets are aligned;

• and having a holddown element, resting on the sheet stack, said alignment means for aligning a topmost delivered sheet being drivable by a drive unit and said alignment means being movable together with the holddown element relative to the stack in the stacking direction, wherein said alignment means comprises a radial cam which is supported on the holddown element so that said alignment means can selectively be brought out of engagement with the topmost sheet of the stack during delivery of a sheet to the stack, and brought into engagement therewith in order to align the delivered sheet, wherein said alignment means have at least one alignment roller which is rotatable about the rotation axis thereof and has on the outer periphery a concentrically arranged D-shaped alignment segment with a friction surface applied on its outer periphery, and wherein said radial cam, configured as a cam plate with a cam lobe, is arranged on the rotation axis of the alignment roller, said holddown element is pivotable in the stacking direction and defines a sheet thread-in guide, and said radial cam is supported with its cam lobe remote from said holddown element when the alignment roller is in engagement with the topmost sheet.