A sheet storage device includes a sheet storage to stack and store sheets conveyed to the sheet storage in a conveyance direction. The sheet storage includes: a first sheet contact surface at a downstream end of the sheet storage in the conveyance direction; a second sheet contact surface at one end of the sheet storage in an orthogonal direction orthogonal to each of the conveyance direction and the gravity direction; a first inclined portion having an upper end at a downstream side and a lower end at an upstream side in the conveyance direction and having the first sheet contact surface tilted downward in a gravity direction from the upper end to the lower end; and a second inclined portion tilted downward in the gravity direction toward the second sheet contact surface in the orthogonal direction.

A stacker device in an items processing system is a last station of a mail line. The stacker device has a receiving plate to receive flat items, a longitudinal alignment wall, graduated in at least two steps, at a rear side of the stacker device, and a stop wall that is arranged at the downstream end of the receiving plate.

A method and a device for combining an auxiliary stack and a main stack include a rake carrying the auxiliary stack and being abruptly movable out of a stack area to prevent sheets that contact the rake from being entrained and to preserve the structure of the stack. A sheet-fed printing press or sheet punching machine having the device is also provided.