A sheet stacking system is disclosed that has improved tolerance for sheets that are not flat. Successive sheets are aligned onto a stack by a plurality of registration belts. The heights of the pivoting registration belts are compared with one another to determine the unevenness of the top of the stack. This unevenness is represented by the difference between the heights of the highest and lowest registration belt .sub.stack-height and is monitored to quantify the planarity of the top of the stack. When the unevenness (.sub.stack-height) exceeds a threshold, the system switches to a modified method to control the elevation of the stack. This method may include stopping the machine from stacking before the unevenness is too large for the registration belts to uniformly drive sheets. This invention prevents the stacker from attempting to stack when sheets are expected to skew thereby preventing jams and unusable stacks.

A sheet stacking system is disclosed that has improved tolerance for sheets that are not flat. Successive sheets are aligned onto a stack by a plurality of registration belts. The heights of the pivoting registration belts are compared with one another to determine the unevenness of the top of the stack. This unevenness is represented by the difference between the heights of the highest and lowest registration belt .sub.stack-height and is monitored to quantify the planarity of the top of the stack. When the unevenness (.sub.stack-height) exceeds a threshold, the system switches to a modified method to control the elevation of the stack. This method may include stopping the machine from stacking before the unevenness is too large for the registration belts to uniformly drive sheets. This invention prevents the stacker from attempting to stack when sheets are expected to skew thereby preventing jams and unusable stacks.

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 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.

An image forming apparatus includes an ejecting port, an ejected sheet tray and a guiding member. The ejected sheet tray has a sheet stacking face inclined upwardly towards a downstream side from a lower side of the ejecting port. The guiding member is provided at a position on the sheet stacking face to contact with a tip end of the ejected sheet at the position. The guiding member includes a base member attached to the sheet stacking face, a movable guide for stacking the ejected sheet and a biasing member. The movable guide is turnably supported on the base member around a supporting shaft. The biasing member is interposed between the base member and the movable guide at an upstream side from the supporting shaft to bias the movable guide upwardly. The movable guide is turned downwardly against a biasing force of the biasing member by weight of stacked sheets.

Stacker device to stack sheets of print media. The stacker device comprises a tray to stack the sheets. The tray comprises an M-shaped tray section to apply an M-shaped profile to a sheet along a direction perpendicular to the sheet's advance direction to reduce curling. The stacker device further comprises a roof. The roof comprises at least one adjustable roof portion to limit a height of a curl of the sheet.

The present invention relates to an improved apparatus for handling documents, such as currency, for example bank notes. A plunger (5) comprises a body (571) and a base (579) such that when the plunger is deployed to urge documents into a securable container, the plunger moves between a fully retracted position and an intermediate position with the base (579) and body (571) together, and between the intermediate position and a fully advanced position the base (579) is displaced from the body (571).

The present invention relates to an improved apparatus for handling documents, such as currency, for example bank notes. A plunger (5) comprises a body (571) and a base (579) such that when the plunger is deployed to urge documents into a securable container, the plunger moves between a fully retracted position and an intermediate position with the base (579) and body (571) together, and between the intermediate position and a fully advanced position the base (579) is displaced from the body (571).

An image forming apparatus includes an ejecting port, an ejected sheet tray and a guiding member. The ejected sheet tray has a sheet stacking face inclined upwardly towards a downstream side from a lower side of the ejecting port. The guiding member is provided at a position on the sheet stacking face to contact with a tip end of the ejected sheet at the position. The guiding member includes a base member attached to the sheet stacking face, a movable guide for stacking the ejected sheet and a biasing member. The movable guide is turnably supported on the base member around a supporting shaft. The biasing member is interposed between the base member and the movable guide at an upstream side from the supporting shaft to bias the movable guide upwardly. The movable guide is turned downwardly against a biasing force of the biasing member by weight of stacked sheets.

A stacking apparatus includes: a stacking portion on which a sheet discharged by a discharge member is to be stacked; a tray including a placement surface on which the same sheet as the sheet stacked on the stacking portion is to be placed, wherein the tray is movable with respect to the stacking portion; and a holding portion configured to hold the tray in a first state and in a second state in which the tray is able to support the sheet. The placement surface of the tray in the first state is in a state of a vertical, or in a state closer to the vertical than the placement surface of the tray in the second state.