JP6101645B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to power supply to parts constituting an image forming apparatus.

  A plurality of devices including circuits, substrates, and the like may be provided in one apparatus. Considering various factors such as normal startup as a whole, capacity of the power supply, prevention of inflow of unnecessary current to circuits where power is not supplied, etc., the power supply order of multiple circuits etc. It may be predetermined.

  For example, Patent Document 1 describes a power supply control device that controls the startup sequence of a plurality of power supply circuits. Specifically, Patent Document 1 discloses a trigger signal output circuit that outputs a start trigger signal, a control signal output circuit that receives the trigger signal and outputs a control signal so as to start each power supply circuit according to a predetermined sequence, and The trigger signal output from the trigger signal output circuit includes one or more level signals indicating an active state at one of the binary levels and one or more pattern signals indicating a specific change pattern of the binary levels. Yes, the control signal output circuit sets a part of the conditions for outputting the control signal to each power supply circuit in combination with the level signal and the pattern signal, and controls the starting order of the plurality of power supply circuits An apparatus is described. With this configuration, the startup sequence control performed for a plurality of power supply circuits is allowed to proceed under more reliable conditions (see Patent Document 1: Claim 1, paragraph [0005], etc.).

JP 2009-060690 A

  In the image forming apparatus, a certain amount of power is consumed even in an unused state (standby state) by maintaining the temperature of the toner fixing member and supplying power to various control units. Therefore, in general, the image forming apparatus has a power saving mode for obtaining a high power saving effect. In the power saving mode, power supply to one or a plurality of devices including circuits and substrates included in the image forming apparatus may be stopped.

  However, the function (for example, printing function) of the image forming apparatus cannot be used due to the stop of the power supply to each device in the image forming apparatus. When the power saving mode is canceled and the image forming apparatus can be used again (normal mode), it is necessary to restart the power supply to the power supply stop portion. In the return to the normal mode, there is a problem that the power supply to each device should be resumed quickly and accurately in accordance with a predetermined order. In other words, there is a problem of how to quickly return from a power stop by an accurate procedure.

  For example, when the output value of a certain power supply circuit (power conversion circuit, for example, a DC-DC converter) becomes large, the next power supply circuit may be activated and the power supply to each device may be resumed in units of power supply circuits (patents). Reference 1). Therefore, it is necessary to wait for the output value of the previous power circuit to rise and stabilize until the next power circuit starts, and there is an unnecessary waiting time for sequentially supplying power to the device. There's a problem. In addition, one or a plurality of devices are connected to the power supply circuit, and power supply to each device is resumed in units of systems that receive power supply from the power supply circuit. However, the power supply order to the device determined by the order in which the power supply circuits are activated is not necessarily suitable, and there is a problem that a circuit and an apparatus for changing the power supply order to the device may be separately required.

  For example, a reset IC (reset circuit) that outputs a signal instructing reset using the time required for charging with a capacitor is used to start (initialize) each device and start communication after power supply starts. In some cases, a reset instruction is given to each device. In such a reset IC, it is necessary to give a margin to the time until a signal instructing reset is issued in consideration of variation in the capacitance of the capacitor. For this reason, there is a problem that a reset instruction cannot be given to each device in the shortest time, and there is an unnecessary waiting time for starting (initializing) each device and starting communication.

  Note that when power supply is stopped, if each device completes processing for power supply stop and does not turn off each device in a predetermined order, it may cause a failure or an error. Therefore, there is a problem that even when power supply is stopped, each device should be stopped in the correct order.

  In the invention described in Patent Document 1, as described above, it is necessary to wait for the output value of the power supply device in the previous order to rise and stabilize until the next power supply device starts up, and the power supply to the devices is sequentially performed. Including the problem that there is an unnecessary waiting time in going. For this reason, the power supply control device described in Patent Document 1 may not be able to minimize the time until the completion of power supply to each device. Further, Patent Document 1 does not mention a reset signal or an order when power supply is stopped. Therefore, the invention described in Patent Document 1 cannot solve the above problem.

  In order to return the image forming apparatus to a state where the image forming apparatus can be used in consideration of the above problems, the present invention sequentially supplies power to each device in which power supply is stopped without any problem as soon as possible. It is an object to reduce the waiting time for conversion and to stop each device in the correct order.

In order to achieve the above object, an image forming apparatus according to claim 1 forms a part of the image forming apparatus, and executes a plurality of devices, a timer for measuring time, and power supply to each of the devices. A power management unit that controls stop, stops power supply to each device when the power saving mode transition condition is satisfied, and supplies power to each device when the release condition is satisfied, and the release condition satisfies A signal reception unit that receives a detection signal indicating that the power supply unit has been performed, a plurality of reset signal lines for transmitting a reset signal from the power management unit to each of the devices, an interval and order when power is supplied, and A memory for storing a table including data indicating an interval and order when power supply is stopped, and a change in the contents of the table is accepted, and data indicating the table after the change is input. That includes an operating panel, a communication unit which receives data indicative of the table after the change from the outside of the computer, and a connection portion outside the memory is connected for storing data indicative of the table after the change, the. The memory updates the original table based on data indicating the changed table, and stores the new table. The table includes data indicating the interval and order in which the devices are reset. When the release condition is satisfied, the power management unit supplies power to each of the devices in a predetermined interval and in a predetermined order based on the timing of the table and the timer, and the power saving When the mode transition condition is satisfied, the power supply to each device is stopped at a predetermined interval and in a predetermined order based on the timing of the table and the timer, and the power supply to each device With the start, each device is reset in a predetermined interval and in a predetermined order based on the timing of the timer, and each device is reset based on the table. Along with the return to the mode, resetting is simultaneously instructed to each of the devices whose power supply has been resumed .

  According to this configuration, when the release condition is satisfied, the power management unit supplies power to each device at a predetermined interval and in a predetermined order based on the timer timing, and shifts to the power saving mode. When the condition is satisfied, the power supply to each device is stopped at a predetermined interval and in a predetermined order based on the timing of the timer. As a result, the power supply to each device can be started and stopped in the correct order. Further, since the process is performed based on the time measurement result of the timer, there is no temporal fluctuation at predetermined intervals, and power supply is started and stopped in order. And it does not depend on the variation in time until the output rise of the power supply circuit and the variation in the capacitance of the capacitor, and it is not necessary to give a margin to the interval for starting the power supply. The power supply can be resumed quickly without waiting time. The “predetermined interval” can be set to the shortest time interval that does not have a margin and does not cause a problem when starting the power supply to each device, starting from the start of power supply to a certain device.

The power management unit causes each device to reset in a predetermined interval and in a predetermined order based on the timing of the timer with the start of power supply to each device. As a result, each device is reset based on the timing of a timer, not a reset IC (reset circuit) using a capacitor, so that a margin is provided in the interval for giving a reset instruction in consideration of variations in the capacitance of the capacitor. There is no need. Accordingly, it is possible to give a reset instruction to each device in the shortest time without providing a waiting time, and to start (initialize) or start communication. Note that the “predetermined interval” does not have a margin while considering the balance with the power supply start of each device. For example, a power supply start to a device or a reset instruction to a device is the starting point. As described above, even if a reset instruction is given, the shortest time interval that does not cause a problem can be set.

Further, the power management unit supplies power to each device in order based on the table when the release condition is satisfied, and supplies power to each device in order based on the table when the power saving mode transition condition is satisfied. To stop. Thereby, the order and interval of power supply start and stop for each device can be set using the table. Therefore, it is possible to easily and flexibly determine the power supply start and stop sequences for each device.

The power management unit resets each device based on the table. Thereby, the order and interval of the reset instruction accompanying the start of power supply to each device can be set using the table. Accordingly, it is possible to easily and flexibly determine a reset or initialization sequence for each device associated with the start of power supply.

The memory stores a table set by the setting input unit. Thereby, it is possible to change or optimize the sequence setting for supplying or stopping power to each device, such as the order or interval of starting and stopping power supply to each device. Therefore, it is possible to increase flexibility and flexibility in sequence setting for power supply to each device and for stopping.

According to a second aspect of the present invention, in the first aspect of the invention, the device is any one of an image processing unit that processes image data, a reading unit that reads a document, and a print engine unit that performs printing, or It was decided to include more than one.

  According to this configuration, the device includes one or more of an image processing unit that processes image data, an image reading unit that reads a document, and a print engine unit that performs printing. As a result, it is possible to minimize the time required for starting up each part of the image forming apparatus. Further, the power supply to each part can be stopped in a preferable and accurate order and interval, and the image forming apparatus can be shifted to a low power consumption state without any problem.

  According to the present invention, in order to make the image forming apparatus usable, it is possible to sequentially supply power as quickly as possible to each device in which power supply is stopped without any problem. In addition, the waiting time for starting up and initializing each device can be reduced. In addition, the power supply to each device can be stopped by a correct procedure.

1 is a schematic front cross-sectional view illustrating an example of a multifunction machine. 2 is a block diagram illustrating an example of a hardware configuration of a multifunction peripheral. FIG. It is a block diagram which shows an example of an electric power supply system | strain. It is a block diagram for demonstrating an operation detection part. It is a block diagram for demonstrating control of the order and interval of the power supply start to each device by a power management part. It is explanatory drawing which shows an example of the content of the table used for a power supply start. It is a timing chart which shows an example of electric power supply and a reset instruction | indication. It is a timing chart which shows an example of electric power supply and a reset instruction | indication. It is a flowchart which shows an example of the flow of control of the power supply start to each device. It is a timing chart which shows an example of the electric power supply stop to each device. It is a flowchart which shows an example of the flow of control of the power supply stop to each device at the time of transfer to power saving mode. It is a flowchart for demonstrating the flow of a table change.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. In the description of the present embodiment, the MFP 100 (corresponding to an image forming apparatus) is taken as an example. However, each element such as configuration and arrangement described in this embodiment does not limit the scope of the invention and is merely an illustrative example.

(Schematic configuration of MFP 100)
First, an outline of the multifunction peripheral 100 according to the embodiment will be described with reference to FIG. FIG. 1 is a schematic front cross-sectional view illustrating an example of the multifunction peripheral 100.

  The multifunction peripheral 100 according to the present embodiment includes a reading unit 1 including an original transport unit 1a and an image reading unit 1b at an upper portion. The document conveying section 1a conveys the documents stacked on the document tray 12 one by one to the reading position (feed reading contact glass 16) of the image reading section 1b. A plurality of documents to be copied or scanned are placed on the document tray 12. The document tray 12 is provided with a document placement detection sensor 13 for detecting that a document is placed. The document placement detection sensor 13 is, for example, an optical sensor, and the output changes between when the document is placed and when no document is placed.

  Further, the document conveying portion 1a can be opened upward by a fulcrum (not shown) provided on the back side of the sheet. Then, by lifting the document conveying portion 1a, a document such as a book can be placed on the placement reading contact glass 14 on the upper surface of the image reading portion 1b. As indicated by a broken line in FIG. 1, an open / close detection sensor 15 is provided for detecting whether the document conveying portion 1a is open or closed (may be provided on the image reading portion 1b side). For example, the open / close detection sensor 15 may be an interlock type switch in contact with the lower surface of the document conveying section 1a or a reflection type optical sensor as long as it can detect the open / closed state.

  Next, as indicated by a broken line in FIG. 1, an operation panel 2 (corresponding to a setting input unit) that accepts a print setting input such as copying and displays various types of information is provided above the front. As indicated by a broken line in FIG. 1, the operation panel 2 is provided on the upper front side of the multifunction device 100. The operation panel 2 includes a touch panel type liquid crystal display unit 21. The liquid crystal display unit 21 displays various statuses such as errors and the like on the multi-function peripheral 100, and various settings including keys and buttons for setting the functions of jobs executed on the multi-function peripheral 100 such as paper size, enlargement / reduction, and density setting. Display the screen for Keys and buttons pressed by the touch panel or the like are recognized by the operation panel 2.

  The operation panel 2 is provided with hard keys such as a numeric keypad 22 for inputting numbers and the like, and a start key 23 for instructing start of job execution. In addition, as a hard key, a power key for instructing ON / OFF of the main power supply of the multifunction device 100, a power saving key for instructing to shift the multifunction device 100 to the power saving mode, and the like may be provided. The user sets the multifunction peripheral 100 by using the liquid crystal display unit 21 and various hard keys.

  An image reading unit 1b, a sheet feeding unit 3a, a conveyance path 3b, an image forming unit 4a, a fixing unit 4b, and the like are provided in the housing of the multifunction peripheral 100.

  The image reading unit 1b reads a document and generates image data. A contact glass (two types of contact glass 16 for feed reading and contact glass 14 for placement reading) is provided on the upper surface of the image reading unit 1b, and the horizontal direction (in FIG. ), And an optical system member (all not shown) such as a lens and an image sensor (for example, CCD) are provided. For example, when a document continuously conveyed by the document conveying unit 1a is read, a moving frame is fixed below the feed reading contact glass 16, and reflected light of the document is guided to a lens and an image sensor. When reading a document placed on the placement reading contact glass 14, the moving frame is moved in the horizontal direction to guide the reflected light of the document to the lens and the image sensor.

  Then, the image reading unit 1b uses these optical system members to irradiate the original with light, A / D converts the output value of each pixel of the image sensor that receives the reflected light of the original, and generates image data. . The multifunction device 100 performs printing (copy function) based on the read image data, transmission of the obtained image data (scan function, FAX function), and the like.

  Two sheet feeding cassettes 31a and 31b are stacked in a vertical direction as the sheet feeding unit 3a that stores and supplies image forming sheets. The paper supply unit 3a is a variety of (for example, plain paper, copy paper, recycled paper, etc.) and a plurality of (for example, about 500 to 1000) sheets of each size (for example, A4, A3, B4, B5, letter size, etc.). ) Load and store.

  Each of the paper feed cassettes 31a and 31b is provided with a paper feed roller 32 that rotates and feeds the paper one by one to the transport path 3b. Each paper feed cassette 31 can be inserted and removed for paper supply. An insertion / removal detection sensor 33 is provided to detect attachment and removal of each of the paper feed cassettes 31a and 31b. For example, the insertion / removal detection sensor 33 may be an interlock switch that contacts one surface of the paper feed cassettes 31a and 31b, or may be a reflective optical sensor as long as it can detect the insertion / removal state.

  Next, the transport path 3b is a path for transporting paper in the apparatus. In the transport path 3b, a plurality of transport roller pairs 34 that are rotationally driven during transport of paper (in FIG. 1, a total of six transport rollers 34a to 34f are shown from the upstream side) and the transported paper are sent to the image forming unit 4a. A registration roller pair 35 and the like are provided that waits in front and feeds paper in accordance with toner image formation.

  Note that a cover (not shown) on the front surface of the multifunction peripheral 100 of the present embodiment can be opened and closed for paper jamming and maintenance. A cover open / close detection sensor 36 is provided to detect the opening / closing of the front cover. The cover open / close detection sensor 36 may be an interlock switch that contacts a part of the front cover, or may be an optical sensor as long as it can detect the opening / closing of the front cover.

  The image forming unit 4a forms an image (toner image) on the sheet fed from the sheet feeding unit 3a based on the image data, and transfers the toner image onto the conveyed sheet. As the image data, image data of a document acquired by the image reading unit 1b, image data transmitted from a computer 200 (see FIG. 2) connected to the multifunction peripheral 100, or the like is used.

  The image forming unit 4a includes a photosensitive drum 41 supported so as to be rotatable in the direction of the arrow shown in FIG. 1, a charging device 42, an exposure device 43, a developing device 44, and a transfer roller disposed around the photosensitive drum 41. 45, a cleaning device 46, and the like. The toner image formation and transfer process will be described. The photosensitive drum 41 is provided substantially at the center of the image forming unit 4a and is driven to rotate in a predetermined direction. The charging device 42 charges the photosensitive drum 41 to a predetermined potential. The exposure device 43 outputs laser light L based on the image data, scans and exposes the surface of the photosensitive drum 41, and forms an electrostatic latent image according to the image data.

  The developing device 44 supplies toner to the electrostatic latent image formed on the photosensitive drum 41 and develops it. The transfer roller 45 is in pressure contact with the photosensitive drum 41 to form a nip. Then, the registration roller pair 35 is timed to cause the sheet to enter the nip. When the nip between the paper and the toner image enters, a predetermined voltage is applied to the transfer roller 45, and the toner image on the photosensitive drum 41 is transferred to the paper. The cleaning device 46 removes the toner remaining on the photosensitive drum 41 after the transfer.

  The fixing unit 4b fixes the toner image transferred to the paper. The fixing unit 4b in the present embodiment is mainly composed of a heating roller 47 and a pressure roller 48 that incorporate a heating element. The heating roller 47 and the pressure roller 48 are pressed to form a nip. When the sheet passes through the nip, the toner is melted and heated, and the toner image is fixed on the sheet. The sheet after toner fixing is discharged to the discharge tray 37. Sent to.

(Hardware configuration of MFP 100)
Next, a hardware configuration of the multifunction peripheral 100 according to the embodiment will be described with reference to FIG. FIG. 2 is a block diagram illustrating an example of a hardware configuration of the multifunction peripheral 100.

  As shown in FIG. 2, the multifunction peripheral 100 of this embodiment can be considered as a combination of a plurality of devices. In the following description, for the sake of convenience, the main control unit 5, the reading unit 1, the print engine unit 4, the operation panel 2, the communication unit 6 (corresponding to the setting input unit), and the like are treated as a unit of the device. Each device is provided with various control units for controlling the device. With the start of power supply to the device, power is supplied to the control units, circuits, and elements in each device, the control unit in the device is activated, and the control unit in the device performs initialization and various warm-ups. , Make the device available.

  In the description of the present embodiment, the main control unit 5, the reading unit 1, the print engine unit 4, the operation panel 2, the communication unit 6, and the like are treated as devices. It can be determined as appropriate whether it is regarded as one unit. For example, the main control unit 5, the reading unit 1, the print engine unit 4, the operation panel 2, and a part (for example, a CPU or various control units) included in the communication unit 6 are handled as one device. 1, the print engine unit 4, the operation panel 2, and the communication unit 6 can also be understood as comprising a plurality of devices.

  First, the main control unit 5 is configured as a combined substrate with various elements, circuits, and the like. The main control unit 5 is a part that controls operation of the multifunction peripheral 100. For example, the main control unit 5 includes a main CPU 51, a storage unit 52, an image processing unit 53, a time measuring unit 54, and the like as parts for performing calculations and processing. The main CPU 51 is an arithmetic processing unit of the main control unit 5, and performs various processes, calculations, and controls based on data and programs stored in the storage unit 52. The storage unit 52 is configured by combining, for example, a nonvolatile storage device (flash ROM or HDD) and a volatile storage device (for example, RAM). The storage unit 52 stores data, programs, image data, and the like required for various controls such as job execution. The storage unit 52 may be provided outside the main control unit 5.

  The image processing unit 53 performs image processing on the image data generated by the image reading unit 1b and image data input from the outside. For example, the image processing unit 53 includes an ASIC dedicated to image processing and an image processing memory. The image data after image processing can be sent to the exposure device 43 for printing (copy function, printer function), can be stored in the storage unit 52 (scanner function), or externally transmitted from the communication unit 6 described later. It can also be transmitted to (computer 200, FAX apparatus 300, etc.) (scanner function, FAX function). The image processing unit 53 may be functionally realized by the main CPU 51 or the storage unit 52. The image processing that can be performed by the image processing unit 53 is diverse, such as enlargement / reduction processing, density change, and the like.

  The timer 54 is a circuit that measures the time required for control. For example, the time measuring unit 54 measures the time until shifting to the power saving mode. Note that the time may be measured using the time measuring function of the main CPU 51.

  The reading unit 1 (corresponding to a device) includes an image reading unit 1b and a document conveying unit 1a. The image reading unit 1b is provided with a reading control unit 10b that controls components and circuits included in the image reading unit 1b. The reading control unit 10b is provided as, for example, a substrate or a circuit including a memory including a program and data required for controlling the CPU and the image reading unit 1b. When the reading control unit 10b receives an instruction to read a document from the main control unit 5, the reading control unit 10b controls the image sensor, the lamp, and the like, and transmits the generated image data to the main control unit 5 and the like. Actually control.

  Similarly, the document transport unit 1a is provided with a document transport control unit 10a for controlling components and circuits included in the document transport unit 1a. The document conveyance control unit 10a is also provided as a substrate or a circuit including a memory including programs and data required for control of the CPU and the image reading unit 1b, for example. When the document transport control unit 10a receives an instruction to execute document transport from the main control unit 5, the document transport control unit 10a controls various rotating bodies to transport the documents one by one toward the reading position.

  A print engine unit 4 (corresponding to a device) is provided for printing on the multifunction peripheral 100. The print engine unit 4 includes the paper feed unit 3a, the conveyance path 3b, the image forming unit 4a, the fixing unit 4b, and the like. In the print engine unit 4, an engine control unit 40 that receives an instruction from the main control unit 5 and actually controls the operation of the print engine unit 4 is provided. The engine control unit 40 includes, for example, a CPU and a memory for storing programs and data used for printing. The engine control unit 40 controls members included in the print engine unit 4 such as paper feeding, conveyance, toner image formation, and temperature control of the fixing unit 4b.

  Next, an operation panel 2 (corresponding to a device) is provided for accepting and displaying setting input in the multifunction peripheral 100. In the operation panel 2, a panel control unit 20 that receives an instruction from the main control unit 5 and actually controls the operation panel 2 is provided. The panel control unit 20 includes, for example, a CPU, various programs, a memory for storing image data for display, and data for accepting input. The panel control unit 20 performs display control on the liquid crystal display unit 21, recognition processing of keys pressed on the liquid crystal display unit 21 by obtaining coordinates pressed from the output of the touch panel, and recognition of pressing of various hard keys. The members included in the operation panel 2 are controlled.

  Further, the multifunction device 100 is provided with a communication unit 6 as a kind of device. The communication unit 6 includes a power management unit 7 that controls ON / OFF of power supply to each device, in addition to the communication control unit 8 that performs communication with an external computer 200 and the like. The communication unit 6 also includes a memory 71 for storing programs and data used in the communication unit 6, a timer 72 and a clock generation unit 73 for measuring the start and stop intervals and timing of power supply to each device. In addition, it includes a signal I / F unit 74 (corresponding to a signal receiving unit) that receives a signal (detection signal) from the operation detection unit and detects that a condition for returning from the power saving mode to the normal mode is satisfied. .

  In the present embodiment, the communication unit 6 is also operated in the power saving mode so that data from the external computer 200 or the like can be received. Therefore, the communication unit 6 has a communication function and ON / OFF of power supply to each device. An example in which a function for performing the OFF control is provided will be described. However, a function (power management function) for controlling ON / OFF of power supply to each device may be separated and provided separately.

  The communication unit 6 includes, for example, a communication control unit 8. The communication control unit 8 includes a communication circuit, a communication connector, and the like, and actually communicates with the external computer 200 (for example, a personal computer or a server) or the FAX apparatus 300 through a network, a line, a cable, or the like. For example, data received by the communication unit 6 is delivered to the main control unit 5. Through the communication via the communication unit 6, printing data can be received from the external computer 200 or the FAX apparatus 300, and image data can be transmitted to the external computer 200 or the FAX apparatus 300.

(Normal mode and power saving mode)
Next, the normal mode and the power saving mode in the multifunction peripheral 100 according to the embodiment will be described with reference to FIGS. 3 and 4. FIG. 3 is a block diagram illustrating an example of a power supply system. FIG. 4 is a block diagram for explaining the operation detection unit.

  First, as illustrated in FIG. 3, the multifunction peripheral 100 is provided with a power supply device 9 that is connected to a commercial power source, generates various voltages, and supplies power to each part of the multifunction peripheral 100 with appropriate voltages. . For example, the power supply device 9 includes a plurality of power conversion circuits 91 including a rectifier circuit, a booster circuit, a step-down circuit, and the like. In the power supply device 9, each power conversion circuit 91 generates a plurality of types of voltages required for the operation of the multifunction device 100 (for example, DC 24V for driving a motor, various control units, DC 5V for driving a memory, 3.3V for DC, DC1.8V etc. are generated).

  A main switch 92 may be provided to turn on / off the connection between the power supply device 9 and the commercial power supply. For example, the main switch 92 is a rocker switch. For example, the main switch 92 is provided on the side surface of the multifunction peripheral 100. The user can turn on / off the main power supply of the multifunction peripheral 100 by the main switch 92.

  As shown in FIG. 3, the communication unit 6 includes a power management unit 7. The power management unit 7 is, for example, a microcomputer. Then, the power management unit 7 opens and closes a switch S (for example, a semiconductor switch such as an FET, see FIG. 5) provided in a power supply path from the power supply device 9 to each device, and supplies power to each device. ON / OFF. In other words, the power management unit 7 manages power supply by switching between energization and shutoff of each device such as the main control unit 5, the reading unit 1, the print engine unit 4, the operation panel 2, and the CPU and various control units therein. To do. In the MFP 100 according to the present embodiment, for power management, the power management unit 7 (communication unit 6), the memory 71, the timer 72, the clock generation unit 73, and the signal I are maintained regardless of the mode while the main power is on. The power supply to a part of the communication unit 6 such as the / F unit 74 is continued.

  When the main power supply of the multifunction device 100 is turned on by turning on the main switch 92, the mode of the multifunction device 100 is started in the normal mode. In the normal mode, as indicated by a solid line in FIG. 3, the power management unit 7 supplies power from the power supply device 9 to the main control unit 5, the reading unit 1, the print engine unit 4, the operation panel 2, the communication unit 6, and the like. Supply. During the normal mode, the power supply apparatus 9 keeps the state of the multifunction peripheral 100 in a state where jobs can be executed.

  For example, the condition for shifting to the power saving mode is that there is no operation or input to the operation detection unit (details will be described later) after entering the normal mode, or there is no operation or input to the operation detection unit after job execution is completed. It is assumed that a predetermined transition time (for example, several minutes to several tens of minutes) has elapsed. In other words, the continuation of the standby state for a predetermined transition time is the transition condition to the power saving mode. Further, a predetermined operation of the liquid crystal display unit 21 of the operation panel 2 or pressing of the power saving key may be set as a transition condition to an instruction to shift to the power saving mode.

  A plurality of operation detection units can be provided in the multifunction peripheral 100. And in normal mode, the output of each operation detection part is transmitted to the main control part 5, for example. The main control unit 5 recognizes whether or not a predetermined transition time has passed without any operation or input to the operation detection unit based on the output of each operation detection unit. In the normal mode, when the operation detection unit recognizes an operation or input to the multifunction peripheral 100, the main control unit 5 resets the count of the transition time.

  For example, as illustrated in FIG. 4, the operation detection unit includes a communication unit 6. When the communication control unit 8 of the communication unit 6 receives print image data or print setting data from the external computer 200, the main control unit 5 recognizes that an operation or input has been made on the multifunction device 100. For example, the operation panel 2 is used as an operation detection unit. For example, when the liquid crystal display unit 21 or various hard keys (such as the start key 23) is pressed, the main control unit 5 recognizes that an operation or input has been performed on the operation panel 2.

  As for the print engine unit 4, an insertion / removal detection sensor 33 for detecting insertion / removal of the paper feed cassettes 31a and 31b and a cover open / close detection sensor 36 for detecting opening / closing of the cover can be used as the operation detection unit. Based on the outputs of the insertion / removal detection sensor 33 and the cover open / close detection sensor 36, the main control unit 5 recognizes an operation and an input to the print engine unit 4. For the reading unit 1, for example, an open / close detection sensor 15 that detects raising / lowering (opening / closing) of the document conveying unit 1 a can be used as the operation detection unit. Further, for example, a document placement detection sensor 13 that detects document placement on the document transport unit 1a can be used as an operation detection unit. Based on the outputs of the document placement detection sensor 13 and the open / close detection sensor 15, the main control unit 5 recognizes the operation and input to the reading unit 1.

  When the transition time elapses without any operation or input to each operation detection unit, the main control unit 5 instructs the power supply device 9 to shift to the power saving mode. As a result, the power supply mode of the power supply device 9 is changed to the power saving mode, and only the necessary voltage is generated in the power supply portion even in the power saving mode. In response to an instruction from the main control unit 5, the power management unit 7 shifts the mode of the multifunction peripheral 100 to the power saving mode. At this time, the power management unit 7 stops power supply from the power supply device 9 to each device (main control unit 5, reading unit 1, operation panel 2, print engine unit 4, communication control unit 8, etc.). Further, the power management unit 7 stops the power supply to the communication control unit 8. Then, in order to recognize the data transmission from the outside to the multifunction peripheral 100, the power management unit 7 causes the signal I / F unit 74 to perform a part of the reception function. Due to these power supply stops, the power consumption during standby is reduced in the power saving mode. As indicated by a broken line in FIG. 3, the power supply device 9 supplies power to each operation detection unit even in the power saving mode in order to return to the normal mode.

  In the power saving mode, functions such as copy, scan, and transmission cannot be used. Therefore, in order for the user to use the multifunction peripheral 100, it is necessary to return the power supply mode of the power supply device 9 from the power saving mode to the normal mode.

  A signal I / F unit 74 provided in the communication unit 6 receives a detection signal (output) from each operation detection unit as a trigger for returning from the power saving mode to the normal mode. The power management unit 7 treats this detection signal as a signal that satisfies the return condition. When there is a detection signal, the power management unit 7 supplies power to each device (main control unit 5, reading unit 1, operation panel 2, print engine unit 4, communication control unit 8, etc.) in a predetermined order. The MFP 100 is resumed, and the MFP 100 is returned from the power saving mode to the normal mode.

  When there is a request (communication request) to send image data or the like from the computer 200 or the like to the multifunction device 100 in the power saving mode (detection signal A), the signal I / F unit 74 of the communication unit 6 To the power management unit 7. Then, the power management unit 7 recognizes that the return condition is satisfied.

  Further, a detection signal may be generated and input to the signal I / F unit 74 by a user's touch operation on the liquid crystal display unit 21 or the hard key of the operation panel 2 (detection signal B in FIG. 4). Further, the insertion / removal detection sensor 33 may generate a detection signal upon detection of removal and attachment due to paper replenishment or replacement, and input the detection signal to the signal I / F unit 74 (detection signal C in FIG. 4). The cover open / close detection sensor 36 generates a detection signal and inputs it to the signal I / F unit 74 when it detects an operation (open / close) of the housing cover for maintenance, consumable replacement, or paper jam handling. Alternatively, the detection signal D in FIG. 4 may be used.

  When the document placement detection sensor 13 for detecting the placement of the paper on the document tray 12 detects the placement of the document on the document tray 12 for copying or the like, a detection signal is generated and the signal I / F unit 74 may be input (detection signal E in FIG. 4). When an operation (document placement or raising / lowering) on the document conveying unit 1a is detected for copying or the like, the open / close detection sensor 15 that detects the raising / lowering of the document conveying unit 1a generates a detection signal, and the signal I / F The signal may be input to the unit 74 (detection signal F in FIG. 4).

(Control of power supply start sequence and interval to each device)
Next, an example of control of the order and interval of power supply start to each device will be described with reference to FIGS. FIG. 5 is a block diagram for explaining the control of the order and interval of power supply start to each device by the power management unit 7. FIG. 6 is an explanatory diagram showing an example of the contents of a table used to start power supply to each device. 7 and 8 are timing charts showing an example of power supply to each device and a reset instruction.

  Depending on the contents of the program of the multi-function device 100, the activation order of each device may be determined. In addition, the startup sequence of each device may be determined in consideration of the capability of the power supply device 9 (for example, allowable ranges of current and power consumption). In addition, for example, the activation order of each device should be determined so that a signal is not input from a portion to which power is supplied (various control units, CPU, etc.) to a device not supplied with power (various control units, CPU, etc.). There is also. In the MFP 100 according to the present embodiment, when the main power is turned on or when the power saving mode is returned to the normal mode, the power management unit 7 supplies power to each device in order at predetermined intervals. I do.

  As shown in FIG. 5, in the multifunction peripheral 100 of the present embodiment, for example, switches S (for example, switches S <b> 1 to S <b> 5 are illustrated in FIG. 5) on power supply lines PL <b> 1 to PL <b> 5 from the power supply device 9 to each device. Is provided. In FIG. 5, power supply lines PL <b> 1 to PL <b> 5 from the power supply device 9 to each device are illustrated as single lines. However, a plurality of power supply lines PL1 to PL5 from the power supply device 9 to each device may be used depending on the type of voltage required for the device (for example, for driving the motor and driving the control unit).

  And the power supply management part 7 switches ON state and OFF state of each switch S, and controls the electric power supply to each device, and a stop (conduction and non-conduction with the power supply device 9). In the following description, a signal generated by the power management unit 7 in order to control the power supply line PL1 to the main control unit 5 is referred to as a supply control signal PW1. Further, a signal generated by the power management unit 7 in order to control the power supply line PL2 to the operation panel 2 is referred to as a supply control signal PW2. Further, a signal generated by the power management unit 7 in order to control the power supply line PL3 to the reading unit 1 is referred to as a supply control signal PW3. A signal generated by the power management unit 7 to control the power supply line PL4 to the print engine unit 4 is referred to as a supply control signal PW4. Further, a signal generated by the power management unit 7 in order to control the power supply line PL5 to the communication control unit 8 is referred to as a supply control signal PW5.

  In addition, reset signal lines RL1 to RL5 for instructing reset are provided between the power management unit 7 and each device (main control unit 5, operation panel 2, reading unit 1, print engine unit 4, communication control unit 8, etc.). Provided. In other words, the power management unit 7 and each device are connected by the reset signal lines RL1 to RL5. Then, the power management unit 7 can change the state of the reset signal lines RL1 to RL5 and give a reset instruction to each device.

  In the following description, a signal generated by the power management unit 7 for a reset instruction to the main control unit 5 is referred to as a reset signal RS1. A signal generated by the power management unit 7 for a reset instruction to the operation panel 2 is referred to as a reset signal RS2. A signal generated by the power management unit 7 for a reset instruction to the reading unit 1 is referred to as a reset signal RS3. A signal generated by the power management unit 7 for a reset instruction to the print engine unit 4 is referred to as a reset signal RS4. A signal generated by the power management unit 7 for a reset instruction to the communication control unit 8 is referred to as a reset signal RS5.

  A table in which the order and interval for starting power supply to each device (main control unit 5, operation panel 2, reading unit 1, print engine unit 4, communication control unit 8, etc.) is set in advance is provided in communication unit 6. Stored in the stored memory 71. The power management unit 7 refers to the table of the memory 71 when the main power is turned on or when returning from the power saving mode to the normal mode, and sequentially supplies power to each device.

  The table also includes data indicating an interval from the start of power supply to a device until the start of power supply to the next device. In order to accurately measure the interval, the communication unit 6 is provided with a timer 72. The timer 72 does not measure the time based on the time required for charging the capacitor, but counts the time by counting a clock signal of a fixed period generated by the clock generator 73 provided in the communication unit 6. Note that the clock generation unit 73 may be provided outside the communication unit 6, and a clock signal may be supplied to the communication unit 6 from the outside.

  Here, an example of the table will be described with reference to FIG. The table shown in FIG. 6 includes data in which the main control unit 5 is first, the communication control unit 8 is second, the operation panel 2 is third, the reading unit 1 is fourth, and the print engine unit 4 is fifth. It is. For example, the main control unit 5 is the first because it controls the whole. However, the power supply order of each device can be determined as appropriate.

  For example, when the main power is turned on, power is supplied to the entire MFP 100. Then, the time point at which the power supply of each device is started is determined based on the power supply time point to the main control unit 5. In addition, the interval of supplying power to the next device after starting the power supply of a certain device (the waiting time from the previous device to the next device) can be obtained by calculation. As shown in FIG. 6, it may be predetermined in the table.

  FIG. 7 is a timing chart when power supply to the entire MFP 100 is started, such as when the main power is turned on. The power management unit 7 refers to the table and supplies power between the devices (the main control unit 5, the operation panel 2, the reading unit 1, the print engine unit 4, the communication control unit 8, and the like) and power between devices. Recognize the interval to perform.

  Then, for example, as shown in FIG. 7, the power management unit 7 starts the main control unit 5 (starts up the supply control signal PW1 at time 0) → communication control unit 8 (starts up the supply control signal PW2 at time T1). → operation panel 2 (supply control signal PW3 is raised at time T2) → reading unit 1 (supply control signal PW4 is raised at time T3) → print engine unit 4 (supply control signal PW5 at time T4) The power is supplied in the order of startup. In addition, the start of power supply to the main control unit 5 is set to zero (starting point), and power supply to the devices is started in order at predetermined intervals of T1, T2-T1, T3-T2, and T4-T3. . Thereby, a voltage is applied to the control part etc. which are contained in each device. The logic of starting and stopping power supply (High is power supply in this embodiment) may be reversed.

  The table may include data indicating the time point when the reset instruction is given to each device (the time point when the state of the reset signal RS1 to the reset signal RS5 is changed). For example, in consideration of communication between the control units of each device, it may be desirable to simultaneously issue a reset instruction to each device (the control unit of each device). Therefore, in the present embodiment, the power management unit 7 instructs to reset each device (the control unit of each device) at the same time (for example, as shown in FIG. 7, the reset signal RS1 to the reset signal RS5 at the time of R1. Launch). Thereby, activation, initialization, and warm-up of each device and its control unit are executed.

  On the other hand, an example in which a reset instruction is simultaneously given to each device is shown in FIG. 7, but the reset point may be changed for each device. For example, FIG. 6 shows an example in which the time from the start of power supply to the main control unit 5 until the reset instruction is given can be set different from R1, R2, and R3. In this case, for each device, data indicating the time of resetting and the reset interval are included in the table.

  In this way, it is possible to start supplying power to each device at an arbitrary order and at an arbitrary interval simply by determining the time point and interval at which power is supplied to each device in the table. In addition, the device can be reset at any time. Therefore, it is possible to easily set whether to start power supply to each device or whether to supply power.

  For example, as shown in FIG. 6, when returning from the power saving mode to the normal mode, a device that resumes power supply and a device that does not resume power can be determined according to a detection signal input to the signal I / F unit 74. it can. For example, the detection signal A is a detection signal when the signal I / F unit 74 receives print data or FAX data addressed to itself in the power saving mode. In such a case, the data indicating the print settings and the image data are included in the received data, so that the job can be executed based on the received data without activating the operation panel 2 or the reading unit 1.

  Therefore, when returning to the normal mode due to the generation of the detection signal A, the power management unit 7 performs the printing based on the main control unit 5, the communication control unit 8 in order to continue receiving image data and the like. Therefore, the power supply is resumed in the order of the print engine unit 4. On the other hand, the power management unit 7 does not resume power supply to the operation panel 2 or the reading unit 1. In other words, the power management unit 7 skips the resumption of power supply to the operation panel 2 and the reading unit 1. In FIG. 6, a device that does not resume power supply is indicated by a symbol “−”). The table defines a device that does not resume power supply and a timing (interval) at which power supply is resumed to the device according to the type of detection signal.

  FIG. 8 is a timing chart when returning to the normal mode by the detection signal A. The power management unit 7 refers to the detection signal input to the signal I / F unit 74 and the table, and each device (main control unit 5, operation panel 2, reading unit 1, print engine unit 4, communication control unit 8). The power supply sequence and the power supply interval are recognized.

  For example, as shown in FIG. 8, the power management unit 7 determines that the main control unit 5 (starts up the supply control signal PW1 at time 0) → communication control unit 8 (starts up the supply control signal PW2 at time T1). → Power is supplied in the order of the print engine unit 4 (the supply control signal PW5 is raised at time T5). On the other hand, the power management unit 7 keeps the power supply to the operation panel 2 (while the supply control signal PW3 is lowered) and the reading unit 1 (while the supply control signal PW4 is raised) stopped. In addition, power supply to the device is started in turn at predetermined intervals of T1, T5-T1, with the start of power supply to the main control unit 5 being zero (starting point).

  In the present embodiment, the power management unit 7 instructs the devices that have resumed power supply to reset simultaneously with the return to the normal mode (for example, at the time of R2 as shown in FIG. 8). At the same time, the reset signal RS1, the reset signal RS2, and the reset signal RS5 rise). Thereby, initialization and start-up are executed in each device and the control unit of each device.

  Further, in FIG. 6, when the detection signal C from the operation panel 2 is generated, it is impossible to determine whether to perform copying or only scanning, so that power supply to all devices is resumed for the time being. The set table is illustrated. In FIG. 6, when the detection signals C and D from the print engine unit 4 are generated, it may be sufficient to check the remaining amount of paper, supply the paper, and check the state of the print engine unit 4 without performing printing or the like. Therefore, for the time being, a table set to resume power supply to the main control unit 5 and the print engine unit 4 is illustrated. In FIG. 6, when the detection signals E and F from the reading unit 1 are generated, there is a case where printing is not performed and the scanning only ends, so that the main control unit 5, the operation panel 2 and the reading unit 1 are The table is set to restart the power supply. Note that the table in FIG. 6 is merely an example, and it is possible to determine which parts are to be restarted in what order and at what intervals according to the detection signal. In addition, the timing chart for restarting the power supply when the detection signal B is generated may be the same as that in FIG. The concept of the detection signal C to the detection signal F may be the same as that of the detection signal A.

  Here, when returning from the power saving mode to the normal mode, power supply may not be resumed for some devices. At the time of returning to the normal mode, the power management unit 7 may resume power supply when necessary for a device for which power supply is not resumed.

  Thus, even if it returns to normal mode, the case where the electric power supply is not restarted with respect to some devices may arise, for example. In this case, when an operation to a device to which power is not supplied is detected by the operation detection unit, or when a function using a device to which power is not supplied is set on the operation panel 2, the power management unit 7 The power supply to the operated device may be resumed. Power is supplied to other devices, and power supply is resumed only to some devices, so that the waiting time of the user is suppressed.

(Control flow for starting power supply to each device)
Next, an example of a control flow for starting power supply to each device according to the embodiment will be described with reference to FIG. FIG. 9 is a flowchart illustrating an example of a control flow for starting power supply to each device.

  First, the start of FIG. 9 is when the main power is turned off or in the power saving mode, and each device (main control unit 5, operation panel 2, reading unit 1, print engine unit 4, communication control unit). 8), when the main switch 92 is turned on or a detection signal is input to the signal I / F unit 74 of the communication unit 6.

  First, the power management unit 7 refers to a table stored in the memory 71 of the communication unit 6 (step # 1). Then, the power management unit 7 checks the devices to which power is supplied, the order in which the power is supplied, the interval at which the power is supplied, and the time point when the reset instruction is given to each device, and the contents of the power supply to be executed Is recognized (step # 2).

  Then, the power management unit 7 supplies (starts) power to the earliest device among the unsupplied devices (step # 3). Next, the power management unit 7 confirms whether or not power has been supplied to all of the power supply target devices (step # 4).

  If not completed (No in step # 4), the power management unit 7 supplies power to the next device from the power supply time to the immediately preceding device based on the table and the time measurement result (measurement result) of the timer 72. It is confirmed whether or not a predetermined interval (time) until the time elapses (step # 5). Then, the power management unit 7 continues to check until a predetermined interval elapses (No in step # 5 → step # 5), and when the predetermined interval elapses (Yes in step # 5), the flow is Return to step # 3.

  On the other hand, if it has been completed (Yes in step # 4), the power management unit 7 performs power supply to each device (main control unit 5, operation panel 2, reading unit 1, print engine unit 4, communication control). The reset signal RS is issued to the unit 8 and the like at a time determined in the table (step # 6). Then, the control at the start of power supply to the device is completed (end).

(Control of power supply stoppage and interval for each device)
Next, an example of the control of the order and interval of power supply stoppage to each device will be described with reference to FIGS. FIG. 10 is a timing chart illustrating an example of stopping power supply to each device.

  In the MFP 100 according to the present embodiment, when shifting from the normal mode to the power saving mode or when the main power supply is interrupted, the power management unit 7 sequentially turns the power of each device at predetermined intervals. Stop supplying. In the power supply stoppage, for example, there is a case where it is necessary to provide time for performing backup to a memory provided in each control unit, and there is a preferable power supply stoppage order of each device.

  In the present embodiment, the power management unit 7 controls the power supply stop timing to each device in the same manner as when power is supplied. As shown in FIG. 5, the power management unit 7 is provided in power supply lines PL1 to PL5 to each device (main control unit 5, operation panel 2, reading unit 1, print engine unit 4, communication control unit 8, etc.). Each of the switches S (switches S1 to S5 are illustrated in FIG. 5) is opened to stop power supply (supply control signal PW1 to supply control signal PW5).

  Then, the order and interval for stopping the power supply of each device are determined in a table stored in the memory 71 in the communication unit 6. The power management unit 7 refers to the table of the memory 71 when shifting to the power saving mode and stops power supply to each device in a predetermined order. The timer 72 counts the clock signal and measures the time, and the power management unit 7 sequentially stops power supply based on the time measured by the timer 72.

  Here, an example of the table will be described with reference to FIG. For example, in the table, as shown in FIG. 6, the order in which the power supply is stopped is determined for each device. In FIG. 6, contrary to the start of power supply, the print engine unit 4 is the first, the communication control unit 8 is the second, the operation panel 2 is the third, the communication control unit 8 is the fourth, and the main control unit 5 is the fifth. As an example to stop the second. The power supply stop order of each device can be determined as appropriate.

  FIG. 10 shows an example of a timing chart when power supply to the device is stopped due to transition to the power saving mode or the like. In the example of FIG. 10, for example, in order to perform printing based on image data transmitted from the external computer 200, the power saving mode is returned to the normal mode (in the case of the detection signal A). 1 shows a case where the power supply to the operation panel 1 and the operation panel 2 is stopped, and after the print job is completed, the power supply mode is again shifted to the reading unit 1 and the operation panel 2 without restarting the power supply.

  For example, as shown in FIG. 10, the power management unit 7 prints the print engine unit 4 (falls the supply control signal PW5 at time T10) → communication control unit 8 (falls the supply control signal PW2 at time T13). → The power supply is stopped in the order of the main control unit 5 (the supply control signal PW1 is lowered at the time of T14). Note that the power management unit 7 changes the states of the reset signals RS1 to RS5 to the states when the power supply is stopped in order to simultaneously instruct the devices that have restarted the power supply to reset with the return to the normal mode. To change. 10 illustrates an example in which power supply to some devices is stopped in the normal mode. However, when power is supplied to the entire MFP 100 in the normal mode, the power management unit 7 What is necessary is just to stop the electric power supply to the main control part 5 grade | etc., In the order and space | interval defined by the table.

(Control flow for stopping power supply to each device)
Next, an example of a control flow for stopping power supply to each device according to the embodiment will be described with reference to FIG. FIG. 11 is a flowchart illustrating an example of a control flow for stopping power supply to each device when shifting to the power saving mode.

  First, the start of FIG. 11 is switched to the normal mode by turning on the main power or returning from the power saving mode, and each device (main control unit 5, operation panel 2, reading unit 1, print engine unit 4, communication control unit 8, etc.). ) In a state where power is supplied to all or a part of the above, and the condition for shifting to the power saving mode is satisfied.

  First, the power management unit 7 refers to a table stored in the memory 71 of the communication unit 6 (step # 11). Then, the power management unit 7 confirms the order in which the power supply is stopped and the interval at which the power supply is stopped, and recognizes the content of the power supply stop process to be executed (step # 12). Then, the power management unit 7 stops power supply to the earliest device among the devices whose power supply has not been stopped (step # 13). Then, the power management unit 7 checks whether or not all the power supply to all devices has been stopped (step # 14).

  If not completed (No in step # 14), the power management unit 7 supplies power to the next device from the stop of power supply to the previous device based on the table and the time measurement result (measurement result) of the timer 72. It is confirmed whether or not a predetermined interval (time) until the stop has elapsed (step # 15). Then, the power management unit 7 continues the confirmation until a predetermined interval elapses (No in step # 15 → step # 15), and when the predetermined interval elapses (Yes in step # 15), the flow is Return to step # 13.

  On the other hand, if it has been completed (Yes in step # 14), the power management unit 7 performs power supply to each device (main control unit 5, operation panel 2, reading unit 1, print engine unit 4, communication control). The state of the reset signal RS toward the unit 8 or the like is changed to prepare for the return from the power saving mode to the normal mode (step # 16). Then, the process of stopping power supply to the device is completed (end).

(Change table)
Next, an example of changing the table in this embodiment will be described with reference to FIG. FIG. 12 is a flowchart for explaining the flow of changing the table.

  As described above, the memory 71 of the communication unit 6 of the present embodiment stores a table. The table includes data indicating the order and interval of power supply and the order and interval for stopping power supply. In addition, the table includes data indicating a distinction between a device that supplies power and a device that does not perform power supply when returning to the normal mode. Here, there is a case where it is desired to update or change the contents of the table from the viewpoint of changing the program stored in the storage unit 52 or the convenience of the user. Therefore, in the MFP 100 according to the present embodiment, the contents of the table can be changed so that a desired power supply or power supply stop process can be performed. Thus, for example, when returning to the normal mode, a device that resumes power supply and a device that does not resume can be set according to the user's will according to the detection signal.

  The multifunction device 100 is provided with an operation panel 2. Therefore, a change in the contents of the table may be accepted by an input to the liquid crystal display unit 21 of the operation panel 2 or the like. Further, data indicating the changed table may be transmitted from the external computer 200 to the communication unit 6, and the table may be changed based on the data received by the communication unit 6. In addition, for example, a connection unit for connecting an external memory such as a USB memory is provided, data indicating the changed table is stored in the external memory, and the changed table is displayed from the external memory connected to the connection unit. Data may be input to the multifunction device 100.

  And the flow of a table change is demonstrated based on FIG. The start of FIG. 12 is a point in time when an attempt is made to change the table. When the table changing process is performed, data indicating the changed table is input to the setting input unit such as the operation panel 2 or the communication unit 6 (step # 21).

  Next, data indicating the changed table is sent to the communication unit 6 (step # 22). Then, the memory 71 of the communication unit 6 updates the original table based on the data indicating the changed table, and stores a new table (step # 23). This completes the table update process (end).

  As described above, the image forming apparatus (for example, the multifunction peripheral 100) of the present embodiment constitutes a part of the image forming apparatus and executes a plurality of devices (main control unit 5, reading unit 1, print engine). Control unit 4, operation panel 2, internal CPU and various control units), timer 72 for measuring time, power supply to each device and stop, and the power saving mode transition condition to each device is satisfied And the power management unit 7 that supplies power to each device when the release condition is satisfied, and a signal receiving unit (signal that receives a detection signal indicating that the release condition is satisfied) When the release condition is satisfied, the power management unit 7 supplies power to each device at a predetermined interval and in a predetermined order based on the timing of the timer 72. To save power If de shift condition is satisfied, predetermined intervals based on the counting of the timer 72 and, in a predetermined order, and stops power supply to each device.

  As a result, power supply to each device (main control unit 5, reading unit 1, print engine unit 4, operation panel 2, etc. and its internal CPU and various control units) can be started and stopped in the correct order. it can. In addition, since processing is performed based on the time measurement result of the timer 72, there is no temporal fluctuation at predetermined intervals, and power supply is started and stopped in order. And it does not depend on the variation in time until the output rise of the power supply circuit and the variation in the capacitance of the capacitor, and it is not necessary to give a margin to the interval for starting the power supply. The power supply can be resumed quickly without waiting time. The “predetermined interval” can be set to the shortest time interval that does not have a margin and does not cause a problem when starting the power supply to each device, starting from the start of power supply to a certain device.

  Also, reset signals (reset signal RS1 to reset signal RS5) from the power management unit 7 to each device (the main control unit 5, the reading unit 1, the print engine unit 4, the operation panel 2, etc., and the CPU and various control units therein). Reset signal lines RL1 to RL5 are provided, and the power supply management unit 7 is set at a predetermined interval based on the timing of the timer 72 and with a predetermined time as power supply to each device starts. Have each device reset in order. As a result, each device is reset based on the time measured by the timer 72, not the reset IC (reset circuit) using the capacitor, so that there is a margin in the interval for giving the reset instruction in consideration of the variation in the capacitance of the capacitor. There is no need to make it. Accordingly, it is possible to give a reset instruction to each device in the shortest time without providing a waiting time, and to start (initialize) or start communication. Note that the “predetermined interval” does not have a margin while considering the balance with the power supply start of each device. For example, a power supply start to a device or a reset instruction to a device is the starting point. As described above, even if a reset instruction is given, the shortest time interval can be used without causing a problem.

  In addition, the image forming apparatus (for example, the multifunction peripheral 100) according to the present embodiment stores a table including data indicating the interval and order when power supply is performed and the interval and order when power supply is stopped. When the release condition is satisfied, the power management unit 7 has a memory 71, and in accordance with the table, each device (main control unit 5, reading unit 1, print engine unit 4, operation panel 2, etc. When the power saving mode transition condition is satisfied, the power supply to each device is stopped in order based on the table. Thereby, the order and interval of power supply start and stop for each device can be set using the table. Therefore, it is possible to easily and flexibly determine the power supply start and stop sequences for each device.

  Further, the table includes data indicating the interval and order of resetting each device (main control unit 5, reading unit 1, print engine unit 4, operation panel 2, etc. and its internal CPU and various control units) The management unit 7 resets each device based on the table. Thereby, the order and interval of the reset instruction accompanying the start of power supply to each device can be set using the table. Accordingly, it is possible to easily and flexibly determine a reset or initialization sequence for each device associated with the start of power supply.

  In addition, the image forming apparatus (for example, the multifunction peripheral 100) according to the present embodiment includes a setting input unit (for example, the operation panel 2 or the communication unit 6) for setting a table, and the memory 71 is configured by the setting input unit. Memorize the set table. As a result, the power supply start and stop order and intervals for each device (main control unit 5, reading unit 1, print engine unit 4, operation panel 2, etc. and its internal CPU and various control units) are given to each device. It is possible to change the sequence setting or optimize the power supply or stop when desired. Therefore, it is possible to increase flexibility and flexibility in sequence setting for power supply to each device and for stopping.

  The devices (main control unit 5, reading unit 1, print engine unit 4, operation panel 2, etc., and CPU and various control units therein) include an image processing unit 53 that processes image data, and a reading unit 1 that reads a document. Any one or more of the print engine units 4 that perform printing are included. As a result, it is possible to minimize the time required for starting up each part of the image forming apparatus. Further, the power supply to each part can be stopped in a preferable and accurate order and interval, and the image forming apparatus can be shifted to a low power consumption state without any problem.

  The embodiment of the present invention has been described above, but the scope of the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention.

  For example, in the above description, the main control unit, the operation panel, the reading unit, the print engine unit, the communication control unit, and the like are exemplified as devices, but the devices are not limited to these. For example, an optional device such as a post-processing device may be handled as a device. The device may be a single chip, circuit, or substrate.

  In the above description, the example in which the power supply is turned on / off in the illustrated device unit has been described. However, when a plurality of types of voltages are supplied to the device, the voltage type is set as one unit, The device may be divided into a plurality of stages, and the power supply and supply stop may be controlled in order at predetermined intervals.

  The present invention is applicable to an image forming apparatus including a plurality of devices whose power supply is individually controlled.

100 MFP (image forming apparatus) 1 Reading unit (device)
2 Operation panel (device, setting input section)
4 Print engine part (device) 5 Main control part (device)
53 Image processing unit 6 Communication unit (setting input unit)
7 Power management unit 71 Memory 72 Timer 74 Signal I / F unit (signal receiving unit)
8 Communication control unit (device) RL1 Reset signal line RL2 Reset signal line RL3 Reset signal line RL4 Reset signal line RL5 Reset signal line

Claims (2)

A plurality of devices that form part of the image forming apparatus and execute processing;
A timer to time,
Power management that controls power supply and stop to each device, stops power supply to each device when the power saving mode transition condition is satisfied, and supplies power to each device when the release condition is satisfied And
A signal receiving unit for receiving a detection signal indicating that the release condition is satisfied;
A plurality of reset signal lines for transmitting a reset signal from the power management unit to each of the devices;
A memory for storing a table including data indicating an interval and order when power supply is performed, and an interval and order when power supply is stopped;
An operation panel that accepts a change in the contents of the table and receives data indicating the table after the change;
A communication unit that receives data indicating the changed table from an external computer;
A connection unit to which an external memory for storing data indicating the table after the change is connected , and
The memory updates the original table based on data indicating the changed table, stores the new table,
The table includes data indicating the interval and order of resetting each of the devices,
The power management unit
When the release condition is satisfied, power is supplied to each of the devices in a predetermined interval based on the timing of the table and the timer, and in a predetermined order,
When the power saving mode transition condition is satisfied, the power supply to each device is stopped at a predetermined interval based on the timing of the table and the timer, and in a predetermined order ,
Along with the start of power supply to each device, each device is reset in a predetermined interval and in a predetermined order based on the timing of the timer,
Also, based on the table, reset each device,
An image forming apparatus that instructs the devices that have resumed power supply to be reset simultaneously with the return to the normal mode . The image forming apparatus according to claim 1 , wherein the device includes one or more of an image processing unit that processes image data, a reading unit that reads a document, and a print engine unit that performs printing. apparatus.

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