A sheet sorting apparatus includes a second tray arranged below a first tray detachable from a main body having a first discharge port corresponding to the first tray and a second discharge port corresponding to the second tray, a discharge unit, a tray detecting unit, and a control unit. The discharge unit discharges a sheet toward the first or second discharge port. In a state that the first tray is detached from the main body and the discharge unit discharges sheets from the first discharge port to the second tray and then the first tray is detected as attached to the main body, the control unit selects a discharge destination of a second sheet, subsequent to a first sheet discharged and stacked first after the first tray is attached to the main body, such that the second sheet is stacked on a tray having the first sheet thereon.

A sheet sorting apparatus includes a second tray arranged below a first tray detachable from a main body having a first discharge port corresponding to the first tray and a second discharge port corresponding to the second tray, a discharge unit, a tray detecting unit, and a control unit. The discharge unit discharges a sheet toward the first or second discharge port. In a state that the first tray is detached from the main body and the discharge unit discharges sheets from the first discharge port to the second tray and then the first tray is detected as attached to the main body, the control unit selects a discharge destination of a second sheet, subsequent to a first sheet discharged and stacked first after the first tray is attached to the main body, such that the second sheet is stacked on a tray having the first sheet thereon.

An image forming apparatus includes a main body, a sheet cassette attachable to the main body and configured to support one or more sheets to be supplied to the image forming unit, and a controller. The main body includes an electrode movable relative to the main body, a capacitance detector configured to output a signal indicating a value corresponding to a quantity of electricity stored in the electrode, and a wire. The sheet cassette includes a metal member, and a sheet supporting plate made of metal, movable relative to the sheet cassette in an up-down direction, and configured to support one or more sheets from below. The controller is configured to determine whether the sheet cassette is at an installation position in the main body from a level of the value of the signal outputted from the capacitance detector connected to the electrode via the wire.

An image forming apparatus includes a main body, a sheet cassette attachable to the main body and configured to support one or more sheets to be supplied to the image forming unit, and a controller. The main body includes an electrode movable relative to the main body, a capacitance detector configured to output a signal indicating a value corresponding to a quantity of electricity stored in the electrode, and a wire. The sheet cassette includes a metal member, and a sheet supporting plate made of metal, movable relative to the sheet cassette in an up-down direction, and configured to support one or more sheets from below. The controller is configured to determine whether the sheet cassette is at an installation position in the main body from a level of the value of the signal outputted from the capacitance detector connected to the electrode via the wire.

A sheet sorting apparatus includes a second tray arranged below a first tray detachable from a main body having a first discharge port corresponding to the first tray and a second discharge port corresponding to the second tray, a discharge unit, a tray detecting unit, and a control unit. The discharge unit discharges a sheet toward the first or second discharge port. In a state that the first tray is detached from the main body and the discharge unit discharges sheets from the first discharge port to the second tray and then the first tray is detected as attached to the main body, the control unit selects a discharge destination of a second sheet, subsequent to a first sheet discharged and stacked first after the first tray is attached to the main body, such that the second sheet is stacked on a tray having the first sheet thereon.

A sheet sorting apparatus includes a second tray arranged below a first tray detachable from a main body having a first discharge port corresponding to the first tray and a second discharge port corresponding to the second tray, a discharge unit, a tray detecting unit, and a control unit. The discharge unit discharges a sheet toward the first or second discharge port. In a state that the first tray is detached from the main body and the discharge unit discharges sheets from the first discharge port to the second tray and then the first tray is detected as attached to the main body, the control unit selects a discharge destination of a second sheet, subsequent to a first sheet discharged and stacked first after the first tray is attached to the main body, such that the second sheet is stacked on a tray having the first sheet thereon.

An automatic document feeder includes a media path to route media through the automatic document feeder, and an automated media tray to receive the media from the media path, with the automated media tray to be positioned based on input of the media to the media path.

An automatic document feeder includes a media path to route media through the automatic document feeder, and an automated media tray to receive the media from the media path, with the automated media tray to be positioned based on input of the media to the media path.

An electric paper tray includes a base, a paper holding element pivotally mounted to at least one side of the base, a power unit arranged at the base, and a lifting module connected between the paper holding element and the power unit. The lifting module is movably mounted under the paper holding element. When the lifting module is driven by the power unit to move to a first position, with respect to the base, the lifting module drives the paper holding element to make the paper holding element rotate to a closed position, when the lifting module is driven by the power unit to move to a second position, with respect to the base, the lifting module drives the paper holding element to make the paper holding element rotate to an opened position.

An image forming system includes an image forming apparatus, a first conveyance path, a sheet feeding unit, a sheet post-processing unit, and a controller. The image forming apparatus has a first feed portion, and an image forming portion. The sheet feeding apparatus has a sheet stacking portion, a second feed portion, a relay conveyance portion, and a remaining amount detecting portion. When, during continuous printing, the existing number of recording sheets present in a conveyance passage from a confluence portion to the first feed portion is more than the constituting number of recording sheets contained in one bundle of sheets and in addition the sensing result of the remaining amount sensor is equal to or less than a predetermined amount, the controller controls first feed portion such that the existing number of the recording sheets is less than the constituting number of recording sheets.