A device (12) for changing a sheet pile in a sheet feeder (10) for a sheet treating machine is described. The device (12) comprises a main pile supporting unit (18) having a supporting surface (22) adapted to support a pallet (16) carrying a sheet pile. Furthermore, the device (12) comprises a residual pile supporting unit (24) with a plurality of residual pile bars (28), which can be moved into a sheet pile region (30) when the sheet pile is to be changed. The residual pile bars (28) are then carrying the sheet pile. When in the sheet pile region (30), each of the residual pile bars (28) is movable in a direction substantially orthogonal to the supporting surface (22), wherein the residual pile bars (28) are movable independently from each other. Furthermore, a method for changing the sheet pile in a sheet feeder (10) for a sheet treating machine is explained.

Provided is a pile preparation unit for changing a first pallet with a second pallet, the pallets for supporting a pile of sheets with a first end and second end where the pallet has a support side, supporting the pile of sheets at the first end and an opposite base side. The pile preparation unit may include a rotation unit configured with an infeed opening for receiving a pallet with a pile of sheets. The rotation unit is configured with a rotating structure to rotate a lift unit about a rotational axis. The lift unit may be configured with a lift structure fixed to the rotating structure and has a lift plate movable along the lift structure to engage with the second end of the pile of sheets and to move and position the pile of sheets transverse, relative to the rotational axis, providing a portal for changing a pallet.

A pile preparation unit for preparing a pile of sheets is provided. The pile of sheets has a first end, which first end is optionally standing on a pallet, and opposite a free second end, a front edge side and a side edge side. The PPU includes a rotation base configured for standing on a floor and for supporting a rotation unit, configured with an infeed side for receiving a pile of sheets in a feed direction. The pile of sheets may optionally be on a pallet. The rotation unit may have a rotation unit frame with a rotation unit frame cross section. The rotation unit may be configured with an edge side support unit, configured with an edge side support face to support an edge side of the pile of sheets when the pile of sheets is in a rotated position to lean on the edge side support face.

Provided is a pile sheet remover system for preparing a pile of sheets with a height, a free end, and a side of sheet edges for processing in a pile preparation unit. The PSR may include a sheet removing unit having a support frame supporting a moving frame, configured for a linear movement in an attack direction towards the side and the free end of the pile of sheets. The moving frame may have a side support plate with a side support face arranged to face and apply to the side of the pile of sheets. The PSR may have a grab plate arranged with a grab face essentially perpendicular to the side support face and extending beyond the side support face in the attack direction, configured with a grab actuator for a grab movement towards the free end of the pile of sheets.

Two-dimensional material sheets are stacked in a stacking device. One of a printing machine and a coating machine has at least one stacking unit having a stacking space. Material sheets are conveyed, via the stacking space of the stacking unit, comprised by the stacking device, and are deposited into a stack on top of one another on a loading aid. For two different production runs, the stacks are formed on the loading aid with the four corners of their areas in mutually different relative orientations with respect to the loading aid, which is arranged, in each case, in the stacking space of the stacking unit and is larger-format compared with the material sheets to be deposited in each case. For the two production runs, in each case, one loading aid of the same format is positioned on different positions, as seen in projection in the horizontal, in the stacking space of the stacking unit.

Apparatus for automatically unstacking a pallet on which at least two stacks of blanks are arranged. The apparatus comprises an unstacking station which is configured for receiving a pallet on which are arranged at least two stacks of blanks in collapsed condition. The unstacking station is further configured for taking off one by one individual blanks from the at least two stacks of blanks which are on a pallet received in the unstacking station. The apparatus further includes a feed track for conveying pallets. The feed track links up by a discharge end with the unstacking station for the purpose of feeding a pallet with stacks of blanks to be unstacked to the unstacking station. Further, the apparatus includes a blank main discharge assembly for discharging individual blanks to a further processing station.

A paper sheet stacking apparatus, includes: a first tray that stacks a paper sheet; a sheet discharger that discharges a paper sheet supplied from the outside of the apparatus to the first tray; a second tray that receives the paper sheet stacked on the first tray and discharges the received paper sheet to the outside of the apparatus; and a hardware processor that controls operation states of the first tray and the second tray, wherein the first tray and the second tray have: a first operation state in which the first tray is positioned at a paper sheet stacking position; a second operation state in which the paper sheet stacked on the first tray is deliverable to the second tray; and a third operation state in which the first tray that has delivered the paper sheet to the second tray is returned to the paper sheet stacking position.

A stacker device includes: a discharger that discharges sheets in response to a print job; a first tray on which the discharged sheets are stacked; a second tray that serves as a delivery destination of the sheets stacked on the first tray; a shutter that covers an opening on a front side of a housing; a driver that moves the first tray in an up-down direction; and a hardware processor that shuts off power to the driver based on a height position of the shutter and a position of the second tray in a front-rear direction.

A stacking apparatus for loading a recording medium output from an image forming apparatus includes a movable tray that is ejectable to an outside of the stacking apparatus after the recording medium output from the image forming apparatus is stacked on the movable tray, and a hardware processor that controls a position of the movable tray based on a current position of the movable tray and a setting condition for determining control content of the movable tray, wherein the hardware processor stores the movable tray inside the stacking apparatus, when the movable tray is currently positioned on the outside of the stacking apparatus and the setting condition satisfies a storage condition for executing storage control for moving the movable tray from the outside to an inside of the stacking apparatus so as to store the movable tray inside the stacking apparatus.

A method for depositing wet printed sheets and forming a sheet stack in a delivery of a printing machine. An auxiliary stack which is separate from the sheet stack has sheet-shaped intermediate layers that are usable as moisture barriers in the sheet stack. A plurality of sheets are stacked on top of one another to form a first section of the sheet stack. Then an intermediate layer is moved from the auxiliary stack onto the section of the sheet stack. A plurality of sheets are stacked on top of one another and on the intermediate layer to form a further section. The intermediate layer is thus arranged in the sheet stack between the first section and the further section. The placement of the intermediate layers provides a way of reducing or even eliminating quality losses in sheets and/or sheet stacks caused by moisture and moisture exchange.