An image forming apparatus which is capable of quickly switching the power mode of the image forming apparatus from the power saving mode to the normal mode. The image forming apparatus includes a printer engine and operates in a normal mode and a power saving mode, the image forming apparatus further includes a main system, a sub system communicably connected with the main system, and an engine controller communicably connected with the sub system and configured to control the printer engine. When the image forming apparatus returns from the power saving mode to the normal mode, the sub system completes start-up of software necessary for communication between the sub system and the engine controller before starting software necessary for communication between the main system and the sub system is completed, and transmits, to the engine controller, device information of the image forming apparatus acquired from the main system.

An information processing apparatus includes a first unit and a second unit supplied with power that can be interrupted individually, a power supply switch configured to be operated by a user, to turn off a power supply of the information processing apparatus, a controller configured to perform shutdown processing of the information processing apparatus thereby interrupting supply of power to the first unit and the second unit, upon turning off of the power supply switch, a first timer unit configured to interrupt the supply of the power to the first unit, after a lapse of a first predetermined time after turning off the power supply switch, and a second timer unit configured to interrupt the supply of power to the second unit, after a lapse of a second predetermined time after turning off the power supply switch. The second predetermined time is longer than the first predetermined time.

In an image forming apparatus a controller starts a heater to heat up in response to a print command In a first case where temperature of the fixing device at a timing of reception of the print command is lower than a first threshold value, the controller starts rotating a first motor, and subsequently starts rotating a second motor before the conveying device conveys the sheet according to the received print command. The first threshold value is lower than the target temperature. In a second case where the temperature of the fixing device at the timing of reception of the print command is higher the first threshold value, the controller starts rotating the second motor, and subsequently starts rotating the first motor before the conveying device conveys the sheet according to the received print command.

An image forming apparatus includes a main controller, a volatile first storage, a sub-controller, a non-volatile second storage, and an associator that associates one or more of a plurality of hardware resources with each of a plurality of activation factors, the main controller includes a mode switcher that switches an operation mode, the sub-controller includes a shut-off controller that shuts off power supply to the main controller, an activation factor detector that detects activation factor, a power recoverer that, in response to detection of activation factor, supplies power to the main controller, and an activator that, in response to detection of activation factors, activates the main controller, and the main controller includes a recoverer that reads out a snapshot from the second storage, and stores the snapshot in the first storage.

An image forming system includes an image forming apparatus having an image reading device, and a post-processing apparatus having a manual staple mechanism. The manual staple mechanism is capable of performing staple processing on condition that power is supplied from the image forming apparatus to the post-processing apparatus. The image forming apparatus stops power supply to the post-processing apparatus on condition that a predetermined time has elapsed since reference timing. When the image forming apparatus reads an original with the image reading device, the image forming apparatus determines presence or absence of a staple mark in the original based on a read result. When the image forming apparatus determines that the staple mark is present, the image forming apparatus extends the predetermined time.

The printing apparatus according to the present invention includes: a printing unit configured to form an image on a printing medium by using a color material and to output the printing medium on which the image is formed; a printing control unit configured to control the printing unit and to store data relating to the printing unit; a power control unit configured to control supply of power to the printing unit and the printing control unit; and a main control unit connected with the printing control unit so as to be capable of communication, and in accordance with a predetermined request, the power control unit performs control so as to suspend supply of power to the printing unit, the main control unit starts acquisition of the data stored by the printing control unit, and the power control unit performs control so as to suspend supply of power to the printing control unit after the main control unit completes acquisition of the data.

A power switching device for switching power between translational motion and rotational motion includes an active gear, a transmission mechanism, a translation mechanism, a functional gear, and a reset mechanism. The active gear can rotate in a first direction or a second direction opposite the first direction. The translation mechanism includes a runner and a pushing member. The active gear can switch between a first position and a second position. In the first position, the active gear meshes with the runner and rotates in the first direction or the second direction to drive the runner to rotate. In the second position, the active gear meshes with the transmission gear and rotates in the second direction to drive the functional gear to rotate.

An image processing apparatus capable of shifting to a power saving mode. The image processing apparatus includes a storing unit configured to store a document in a storage device, a notification unit configured to periodically notify an apparatus of a predetermined destination of information about a document that has been newly stored by the storing unit into the storage device, and a control unit configured to restrict shifting to a power saving mode in which the notification unit cannot make the notification after storage of a document by the storing unit has been completed and until the notification unit notifies at least information about the document.

An image forming apparatus includes a first control circuit, a second control circuit, and a third control circuit. The first control circuit communicates with an information processing device. The second control circuit is configured to communicate with the first control circuit. The third control circuit is configured to communicate with the second control circuit and control a printer. The first control circuit is configured to receive print information from the information processing device during a power-saving mode and control the start of the second control circuit based on the print information. The second control circuit is configured to control a power supply to the third control circuit based on the start by the first control circuit and transmit, to the third control circuit, a warm-up start instruction for the printer based on the print information acquired from the first control circuit after communication with the third control circuit becomes possible.

A control device includes: a wireless communication section that operates while being continuously supplied with power; and a detection section that detects approach of a user. The control device further includes: an authentication processing section that authenticates a user of a terminal in response to reception of a request from the terminal by the wireless communication section when supply of power to a processing section of an information processing apparatus is stopped; and a control section that starts supplying power to the processing section when the approach of the user of the terminal is detected by the detection section after the authentication succeeds.