An information processing apparatus executes, for image data to be printed by a printing device, image processing corresponding to a content of the image data; transmits, to the printing device, image data obtained after executing the image processing; acquires, before executing the image processing, a first transfer rate with respect to the printing device and a requested transfer rate required by a print operation of a print unit of the printing device; attempts image processing for the image data; and acquires, based on the first transfer rate and information of image data obtained after the attempt, a second transfer rate required by transmission, to the printing device, of the image data obtained after the attempt and the print operation of the print unit.

A conveyance apparatus includes a separation unit configured to separate and convey a sheet, a detection unit configured to detect a floating of the sheet passing through the separation unit, and a control unit configured to stop separate conveyance by the separation unit if the detection unit detects the sheet for not less than a predetermined time and/or a predetermined count.

An image forming apparatus includes an HDD, an HDD confirming unit, a system control unit, and a non-volatile semiconductor storage device. The HDD stores user data created by a user. The HDD confirming unit determines whether or not the HDD is in an inoperative state. The system control unit separates the HDD from the image forming apparatus to set the image forming apparatus to a restriction mode when the HDD is in the inoperative state. The non-volatile semiconductor storage device stores system data used for an operation of the system control unit.

An image reading apparatus includes a reading unit including a reading sensor to read image information from a sheet through a transparent portion. The reading unit is movable with respect to a frame of the apparatus and is urged by an urging member toward a facing member facing the transparent portion. A fixed guide fixed to the frame is disposed in adjacent to the reading unit in the sheet conveyance direction. A plurality of protruded portions provided on either one of the reading unit and the fixed guide, and a plurality of recessed portions provided on the other of the reading unit and the fixed guide and formed so as to engage with the plurality of the protruded portions. The reading unit is movable with the plurality of the protruded portions loosely fit with the plurality of the recessed portions.

An image reading apparatus includes a first white memory, a second white memory, an image reading device to acquire an image data with a resolution mode, circuitry to process signals of the image data, determine whether the image data is one of first white shading data as a reference, the first white shading data or the image data acquired from an original document read by the image reading device, temporarily store the first white shading data in the first white memory, stores the first white shading data stored in the first white memory in the second white memory, converts a resolution of the first white shading data stored in the second white memory according to a resolution of the image data to create second white shading data, stores the second white shading data in the first white memory, and correct the image data by the second white shading data.

An image forming apparatus includes an HDD, an HDD confirming unit, a system control unit, and a non-volatile semiconductor storage device. The HDD stores user data created by a user. The HDD confirming unit determines whether or not the HDD is in an inoperative state. The system control unit separates the HDD from the image forming apparatus to set the image forming apparatus to a restriction mode when the HDD is in the inoperative state. The non-volatile semiconductor storage device stores system data used for an operation of the system control unit.

A printing apparatus includes a conveying roller to convey a sheet from a roll sheet and a printing unit. In addition, a cutter is provided downstream of the printing unit and cuts the sheet, an operation input unit accepts a setting indicating whether to cut the sheet in case of canceling a print job, and a control unit interrupts the printing operation if an open state of a cover is detected during the printing operation and controls the conveying roller to return the sheet to a predetermined position if a closed state of the cover is detected afterward. If a setting indicates that the sheet is not cut, the conveying roller returns the sheet to the predetermined position without cutting the sheet with the cutter in a case of canceling a print job.

An image transmitting apparatus includes: a transmission circuit that, in response to an input lock signal switching from a first logic state to a second logic state, transmits, to an image receiving apparatus, transmission data, the transmission data being data in which a clock signal is superimposed on image data, the first logic state indicating that communication has not been established, the second logic state indicating that communication has been established; and a lock-signal masking unit that receives the lock signal from the image receiving apparatus, and that, even when the received lock signal enters the second logic state and then varies to the first logic state, only in the case where the first logic state continues for a preset time or longer, outputs a lock signal of the first logic state to the transmission circuit.