An input device is mountable on an image forming apparatus including a display portion capable of displaying information and is a numerical key unit 70 at least including a numerical key portion 110 consisting of a hardware key capable of inputting information on a numerical value and a start key 131 consisting of a hardware key capable of inputting information for starting predetermined processing. The start key 131 is disposed on a front side F than the numerical key portion 110 in a state in which the numerical key unit 70 is mounted on the image forming apparatus.

An image forming apparatus, having a main body including an image forming device, an optional device configured to be attached to a lower side of the main body, a recessed section formed at a lower position in the main body for clutching by a hand, and a fastening member arranged in the recessed section to fasten the main body and the optional device to each other, is provided.

An image forming apparatus to which a sheet treating apparatus is to be connected, including: a communication device, having a serial port used for serial communication with the sheet treating apparatus and a parallel port used for parallel communication with the sheet treating apparatus, configured to communicate with the sheet treating apparatus, one or more processors. The at least one of the one or more processors operates to determine a communication method to communicate with the sheet treating apparatus based on configuration information representing a connection configuration of the sheet treating apparatus, switch an operation of the serial port such that the serial port of the communication device is used in the parallel communication in a case where a determined communication method is a method in which the parallel communication is performed and the serial communication is not performed.

A sheet conveyor device is to be attachably and detachably mounted to an external apparatus which forms an image on a sheet. The sheet conveyor device includes a judgement section, a speed determining section, and a conveyance controller. The judgement section determines which of a plurality of model groups the external apparatus belongs to based on specification information indicating specifications of the external apparatus. The speed determining section determines a conveyance speed at which the sheet is to be conveyed based on the determined model group. The conveyance controller directs conveyance of the sheet at the determined conveyance speed.

An image forming apparatus includes a cover portion and an auxiliary tray. The cover portion is displaced between a closing position for closing the supply port and an opening position for opening the supply port. The auxiliary tray is attached to a sheet stack surface of the cover portion, and supports the sheet, together with the cover portion at the opening position. The auxiliary tray is, either in a first attachment state or in a second attachment state, attached to the cover portion. In the first attachment state, a longitudinal direction of the auxiliary tray extends along a width direction that crosses a sheet insertion direction and the auxiliary tray is stored in the sheet stack surface. In the second attachment state, the longitudinal direction extends along the sheet insertion direction, and the auxiliary tray extends out from the cover portion toward an upstream in the sheet insertion direction.

An image forming apparatus includes, an image forming portion configured to form a toner image on a sheet using printing toner and apply powder adhesive on the sheet, a fixing portion configured to heat the toner image formed on the sheet and the powder adhesive applied on the sheet by the image forming portion and fix the toner image and the powder adhesive to the sheet, and a bonding portion configured to bond the sheet with the powder adhesive by reheating the sheet having been heated by the fixing portion. The bonding portion is arranged above the image forming portion.

A mount apparatus to be mounted on a top surface, in a vertical direction, of a main body of an image forming apparatus configured to form an image on a sheet, includes a latch member extending toward the main body from a surface facing the top surface of the main body and being rotatable around a rotational axis extending in a direction along a direction orthogonal to the vertical direction, and a biasing member configured to bias the latch member in a predetermined rotation direction. The latch member is inserted into the main body through an opening that is provided on the top surface of the main body and is engaged with the main body by a biasing force of the biasing member in a state where the mount apparatus is mounted on the main body.

A sheet sorting apparatus comprising a first tray, a second tray, a conveyance unit, a tray detection unit, a stacking amount detection unit, and a control unit configured to control the conveyance unit to not convey the sheet to the second tray, in a case where the stacking amount detection unit detects that the amount of sheets reaches the predetermined amount, wherein the control unit is configured to permit the conveyance unit to convey the sheet to the second tray, in a case where the tray detection unit detects that the first tray is detached from the apparatus main body in a state where the stacking amount detection unit detects that the amount of sheets reaches the predetermined amount and conveyance of the sheet to the second tray by the conveyance unit is stopped.

A sheet sorting apparatus comprising a first tray, a second tray, a conveyance unit, a tray detection unit, a stacking amount detection unit, and a control unit configured to control the conveyance unit to not convey the sheet to the second tray, in a case where the stacking amount detection unit detects that the amount of sheets reaches the predetermined amount, wherein the control unit is configured to permit the conveyance unit to convey the sheet to the second tray, in a case where the tray detection unit detects that the first tray is detached from the apparatus main body in a state where the stacking amount detection unit detects that the amount of sheets reaches the predetermined amount and conveyance of the sheet to the second tray by the conveyance unit is stopped.

An accessory mating system for mating a print engine to an accessory may include a pin and a pin receiving detent. The pin has a collar having a pin vertical axis datum surface and a shaft extending from the collar. The shaft provides left-right axis datum surfaces and second opposite sides providing fore-aft axis datum surfaces. The pin receiving detent receives the pin. The pin receiving detent may include a detent perimeter providing a detent vertical axis datum surface, first opposite internal sides providing first detent left-right axis datum surfaces facing the pin left-right axis datum surfaces and second opposite internal sides providing detent fore-aft axis datum surfaces.