A toner container includes a container body, an opening, a cover, a toner discharge port, a shutter, a cylindrical structure, protrusions, and an identifier. The shutter is attached to the cover and includes a main shutter covering the toner discharge port. The main shutter moves between a closed position to close the toner discharge port and an open position to open the toner discharge port. The protrusions are on both sides of the cover and protrude in a direction orthogonal to a toner container mounting direction. The identifier is on the cover to indicate a toner color. The cylindrical structure's leading end is downstream of leading ends of the protrusions in the mounting direction. The main shutter's leading end is downstream of the protrusions' leading ends in the mounting direction when the main shutter is in the closed position. The protrusions are downstream of the identifier in the mounting direction.

A print substance container includes a print substance reservoir, a flange, and sensor system. The print substance reservoir includes a set of walls including an upstanding wall and a base. The set of walls enclose an interior of the print substance reservoir. The flange is remote from the interior of the print substance reservoir. The sensor system includes a level sensor, a reference full sensor, and a reference empty sensor. The level sensor is attached to the upstanding wall opposite the interior of the print substance reservoir. The reference full sensor is attached to the base opposite the interior of the print substance reservoir. The reference empty sensor is attached to the flange.

An image forming apparatus includes image forming units having unit identification data, unit attachment portions having attachment portion identification data, an acquisition unit, a calculator, a storage unit, a controller, and a notification unit. The acquisition unit acquires data set of the two types of data. The calculator calculates data that are correction data for correcting image forming conditions or data on corrected image forming conditions. The storage unit stores the data set and the calculation data corresponding to the data set. The controller executes a data reuse control of controlling the image forming units using the calculation data that are stored in the storage unit and correspond to the data set after the data set is changed. The notification unit notifies execution-related information on execution of the data reuse control before the data reuse control.

An image forming apparatus includes a sensor configured to detect a remaining amount of a recording agent in a cartridge mounted in the image forming apparatus, an output device configured to output at least one of visual and audio information, and a controller. The controller is configured to, upon a first cartridge being dismounted, store, as a previous remaining amount, a remaining amount of a recording agent in the first cartridge detected by the sensor. The controller is also configured to, upon a remaining amount of a recording agent in a second cartridge that has been mounted in the image forming apparatus after the first cartridge is dismounted decreasing to or below a first threshold value as detected by the sensor, control the output device to output information that varies based on a value of the previous remaining amount.

An image forming apparatus includes a developing cartridge, a main memory and a controller. The controller is configured to perform determining whether the developing cartridge is reached a lifetime on a basis of: at least one of s developing maximum printable number of sheets which corresponds to developing identification information, a maximum developing roller rotation number which corresponds to the developing identification information, and a maximum dot count which corresponds to the developing identification information; and at least one of a developing cumulative number of printed sheets, a cumulative developing roller rotation number and a cumulative dot count.

A printing device includes a door, a display, and a colorant supply. The printing device detects that the door has been opened. In response to detecting that the door has been opened, the printing device displays, on its display, current status information of the colorant supply within the printing device.

The present disclosure provides an electrical parameter detection method, a chip, a consumable, and an image forming apparatus. The electrical parameter detection method includes: configuring an installation detecting pin to be at a high level by an image forming control unit; controlling a voltage of an installation detecting terminal to be at a low level by a chip control unit, such that a current loop is formed between the image forming apparatus and the chip; and determining, by the image forming apparatus, whether the image forming apparatus is in a desired contact with the chip according to an electrical parameter of the current loop.

A cartridge includes: a housing; a storage medium; and a holder. The storage medium has an electrical contact surface. The holder is movable relative to the housing. The holder includes: a first holder member; and a second holder member. The first holder member has a pawl portion and is configured to hold the electrical contact surface. The second holder member includes a corner portion. The pawl portion is engageable with the corner portion. The second holder member has a through-hole. An engagement part of the pawl portion engaging with the corner portion is accessible from outside the second holder member through the through-hole in a state where the pawl portion engages with the corner portion.

A toner container includes a container body, an opening, a cover, a toner discharge port, a shutter, a cylindrical structure, protrusions, and an identifier. The shutter is attached to the cover and includes a main shutter covering the toner discharge port. The main shutter moves between a closed position to close the toner discharge port and an open position to open the toner discharge port. The protrusions are on both sides of the cover and protrude in a direction orthogonal to a toner container mounting direction. The identifier is on the cover to indicate a toner color. The cylindrical structure's leading end is downstream of leading ends of the protrusions in the mounting direction. The main shutter's leading end is downstream of the protrusions' leading ends in the mounting direction when the main shutter is in the closed position. The protrusions are downstream of the identifier in the mounting direction.

An example consumable print device component may include a surface and a human-indiscernible hardware-based identifier arranged on the surface.