Patent ID: 7318586

Claim:
Spiral slot stacker for stacking sheet material, comprising: a stacker wheel with slots spirally disposed one behind the other around a rotational axis for receiving the sheet material, a stripper including a first movable part and a second movable part, the first and second movable parts being movable into, and out of, respective first and second strip-out positions in which the first and second movable parts strip out the sheet material from the slots of the stacker wheel, and a stack deposit for stacking the sheet material stripped off the slots, wherein the first movable part of the stripper moves out of the first strip-out position, while the stacker wheel is rotating, in such a way that the sheet material is stripped out from one of the slots of the stacker wheel and the sheet material of a next slot remains in the stacker wheel, and wherein the second movable part of the stripper is lockable in the second strip-out position and, when released, moves out of the second strip-out position and rotates along with the rotating stacker wheel.