In accordance with an embodiment, a sheet removal determination system has a first detection device to detect a sheet discharged to a discharge port; a second detection device to detect a terminal device positioned within a communication enabled range of the second detection device; and a controller to determine whether or not a user is authorized user based on user information acquired from the terminal device detected by the second detection device, determine that the sheet has been improperly removed if the user is not the authorized user and the second detection device detects the terminal device and a quantity of the sheets is less than that of the sheets before detection after the sheet is detected by the first detection device, and detect the terminal device again with the second detection device if the second detection device detects the terminal device and a quantity of the sheets is increasing than that of the sheets before detection after the sheet is detected by the first detection device.

An image forming apparatus includes a conveyor, a sensor, and control circuitry. The conveyor is configured to convey a sheet. The sensor is configured to detect the sheet conveyed by the conveyor. The control circuitry is configured to cause the conveyor to eject the sheet without stopping conveyance of the sheet and prohibit recovery printing when a size of the sheet determined based on detection of the sheet by the sensor is different from a setting size in a first operation mode. The control circuitry is configured to cause the conveyor to stop conveyance of the sheet and allow recovery printing when the size of the sheet is different from the setting size in a second operation mode in which a number of times of printing is larger than a number of times of printing in the first operation mode.

An apparatus that operates with a detachable unit mounted therein, includes: a storage unit configured to store a public key; and a verification unit configured to verify data held by the mounted unit, based on the public key. The data includes attribute information indicating an attribute of the unit, and authentication information generated from target information including the attribute information with a secret key paired with the public key and from which the target information is restorable, and the verification unit is further configured to detect an anomaly in the attribute information or the authentication information included in the data, by determining whether the attribute information included in the target information restored from the authentication information using the public key matches the attribute information included in the data.

In an example, a print system include a component device that is operation in a number of state, a density engine, and a component engine. An example density engine identifies a plane region of a plane where print fluid is to be printed based on data of a print job and determines a density classifier for the plane based on a location of the plane region on the plane. An example component engine causes an adjustment of a component attribute of the component device based on the density classifier.

A printer-verifier is provided for printing and verifying a printed indicium. Printer-verifier includes imaging module for capturing image of printed indicium on print media, memory communicatively coupled to imaging module and configured to store print quality verification program, and processor communicatively coupled to memory. Processor is configured by print quality verification program to evaluate print quality of printed indicium, determine if print quality meets print quality standard, reject printed indicium on print media as rejected printed media when print quality does not meet print quality standard, and one of output location-specific feedback about rejected printed media or send a command signal to cutting device to destroy rejected printed media. Location-specific feedback is in same language as language associated with printer-verifier. A printer and methods for verifying the printed indicium are also provided.

In accordance with an embodiment, a sheet taking away determination system comprises a first detection device configured to detect a sheet discharged to a discharge port; a second detection device configured to detect a terminal device positioned within a communication enabled range of the second detection device; and a controller configured to determine that the sheet is taken away if the second detection device detects the terminal device and a quantity of the sheets is less than that of the sheets before detection after the sheet is detected by the first detection device.

In accordance with an embodiment, a sheet taking away determination system comprises a first detection device configured to detect a sheet discharged to a discharge port; a second detection device configured to detect a terminal device positioned within a communication enabled range of the second detection device; and a controller configured to determine that the sheet is taken away if the second detection device detects the terminal device and a quantity of the sheets is less than that of the sheets before detection after the sheet is detected by the first detection device.

There is provides an image forming apparatus including a main body control apparatus including a main body memory, a main body cassette, and additional cassettes different from the main body cassette and communicably coupled to the main body control apparatus. The main body memory has transmission queues that are provided for the respective additional cassettes communicably coupled to the main body control apparatus and temporarily store commands to be transmitted to the additional cassettes. When a plurality of commands are stored in each of the transmission queues, the main body control apparatus carries out for each of the transmission queues the process of generating a first combined command that is the combination of the plurality of commands stored in the transmission queue, and transmitting the first combined command to the additional cassette.

A printing apparatus includes a printing unit, a conveyance unit, a motor, and a control unit. The printing unit performs printing on a sheet. The conveyance unit conveys the sheet to a printing position for the printing unit. The motor drives the conveyance unit. The control unit executes control. The control unit stops the motor which is rotating at a target position, executes holding control to hold the motor at a stop position, and updates, during execution of the holding control, the target position to a position different than the target position based on a rotational speed of the motor.

A controller to control an apparatus (e.g. a printer) can include multiple secondary sub-controllers and a main sub-controller. Each of the secondary sub-controllers can have an operator process and one or more executable control processes. Each of the control processes can be configured to exchange data with one or more other of the control processes. The main sub-controller can be communicatively coupled to the secondary sub-controllers via a data network. Each of the main and secondary sub-controllers can include at least one processor and an operating system. The respective operator processes can be configured to communicate via the data network, and the control processes of each of the secondary sub-controllers can be configured such that the control processes communicate exclusively with the operator process of their respective secondary sub-controller to communicate via the data network.