JP5538320B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to a shift to a power saving mode in an image forming apparatus such as a copying machine, a multifunction machine, a printer, or a facsimile machine.

  In recent years, image forming apparatuses such as copiers and printers are equipped with a power saving mode for reducing power consumed during standby. For example, assuming that the normal mode is a state in which all functions of the image forming apparatus can be used, in the power saving mode, power supply to a portion with high power consumption (for example, a fixing heater) is stopped. From the viewpoint of reducing power consumption, it is desirable to shift to the power saving mode as soon as possible after using the image forming apparatus. On the other hand, in the power saving mode, the function of the image forming apparatus cannot be used, and it takes a certain time until the image forming apparatus can be used after returning from the power saving mode to the normal mode. Therefore, it should be shifted to the power saving mode so that it is not difficult for the user to use. Therefore, it is necessary to consider the transition timing from the normal mode to the power saving mode.

  An invention relating to the timing of shifting to such a power saving mode is described in Patent Document 1. Specifically, Patent Document 1 discloses means for measuring the time until the transition from the standby state to the energy saving mode and the time until the transition from the energy saving mode to the standby state, means for recognizing the day of the week and time, and image formation. When the device is used frequently, it has a control means that sets the transition time to the energy saving mode longer and the transition time is set shorter in the less frequently used time zone, and does not perform the output operation for a certain period of time. Describes an image forming apparatus that executes an energy saving mode by shutting off the energization of the fixing heater from at least a standby state in which the fixing heater can fix. Accordingly, the standby time for each time zone is determined in advance by predicting the frequency of use, so as to avoid wasting time until entering the energy saving mode (see Patent Document 1: Claim 1, paragraph 0055, etc.).

JP 2004-101919 A

  As described above, the image forming apparatus shifts to the power saving mode when a predetermined transition time elapses in a standby state in which the image forming apparatus is not used or operated after completion of the job. In some image forming apparatuses, the user can set the transition time (for example, the transition time is set to about several tens of minutes).

  Even if the user sets a desired transition time, the transition time is fixed. Therefore, in any situation, the image forming apparatus does not shift to the power saving mode unless the transition time elapses after the operation or input to the image forming apparatus is not performed. For example, when the transition time is set to 60 minutes, the transition to the power saving mode is not made unless one hour has passed after the image forming apparatus has been used once. Therefore, power consumption is wasted. Therefore, there is a problem that it is necessary to adjust and change the transition time to the power saving mode in accordance with the actual use and situation in order to eliminate waste of power consumption.

  On the other hand, as in the invention described in Patent Document 1, the number of times of use in each time zone of each day of the week is stored, and the transition time to the power saving mode may be extended on days and times of day when the frequency of use is high. . However, the current usage status is not reflected in the transition time to the current power saving mode (the same time zone of the next week is reflected). Therefore, if the usage status changes from the last week, the transition time to the power saving mode is not appropriate. For example, although the image forming apparatus is frequently used in a certain time zone last week, if the image forming apparatus is hardly used this week, the transition time is set longer than necessary in this week. Therefore, in the invention described in Patent Document 1, there is a problem that the transition time to the power saving mode cannot be adjusted or changed in accordance with the current use situation and situation.

  In view of the above problems, the present invention measures the key press interval, determines the transition time to the power saving mode based on the interval, and adjusts the transition time to the power saving mode with reference to the usage status of the user. An object is to promptly shift to the power saving mode while making changes so as not to make the user feel uncomfortable.

  In order to achieve the above object, an image forming apparatus according to a first aspect includes a job execution unit that executes a job and an operation panel that receives a job setting input, and an operation input detection that detects an operation and an input to the image forming apparatus. Unit, a time measuring unit that measures an interval of pressing a key on the operation panel, and the measured interval, the longer the measured interval, the longer the transition time from the normal mode to the power saving mode. A control unit for obtaining a transition time, and in the normal mode, when an input to press the key is made to the operation panel a plurality of times, a job is not executed, and then the operation input detection unit is When the transition time determined by the control unit elapses without any operation or input, the mode shifts to the power saving mode. In the power saving mode, at least for the job execution unit A power supply unit that stops power supply and returns to the normal mode when the operation input detection unit detects an operation or input to the image forming apparatus in the power saving mode, and supplies power to the job execution unit in the normal mode; , Including.

  The interval at which the setting key on the operation panel is pressed is related to the user's operation with respect to the image forming apparatus, the degree of skill in setting, and the agility in using the image forming apparatus. As the user presses the key more frequently, the time from the completion of the job or the input of the last key to the next operation or input to the image forming apparatus tends to increase. On the other hand, users with short key press intervals tend to shorten the time until the next operation or input to the image forming apparatus after completion of a job or after the last key is input due to an agile operation. .

  Therefore, according to this configuration, the control unit obtains the transition time based on the measured interval so that the transition time from the normal mode to the power saving mode becomes longer as the measured interval is longer. Thereby, when the interval is short, the transition time to the power saving mode is shortened, and wasteful power consumption can be eliminated by promptly shifting to the power saving mode. On the other hand, when the interval is long, a user who is not familiar with the operation and input of the image forming apparatus tries to use the image forming apparatus again or when the user tries to input to the operation panel. It is possible to eliminate the inconvenience of having to wait until the image forming apparatus can be used because it is in the mode. Therefore, it is possible to adjust and change the transition time to the power saving mode in accordance with the current usage status in accordance with the usage status of the user, the user's operation of the image forming apparatus, and input proficiency. And it can change to power saving mode promptly, making a user not feel hard to use.

  According to a second aspect of the present invention, in the first aspect of the present invention, the control unit determines a reference value for determining the transition time based on the plurality of measured intervals, and is preset to the reference value. The time multiplied by the constant was determined as the transition time.

  According to this configuration, the control unit determines a reference value for determining the transition time based on the plurality of measured intervals, and obtains a time obtained by multiplying the reference value by a predetermined constant as the transition time. Thereby, the transition time to the power saving mode can be adjusted and changed according to the interval at which the key is pressed.

  According to a third aspect of the present invention, in the second aspect of the invention, the control unit determines an average value of the plurality of measured intervals or one of the plurality of intervals as the reference value. It was decided.

  According to this configuration, the control unit determines the average value of the plurality of measured intervals or one interval among the plurality of intervals as the reference value. As a result, the transition time to the power saving mode can be determined based on the interval recognized as appropriate.

  The invention according to claim 4 is the invention according to claim 2 or 3, wherein the operation panel accepts the setting of the constant, and the control unit sets the reference value to the constant set on the operation panel. The multiplied time was determined as the transition time.

  According to this configuration, the control unit obtains, as the transition time, the time obtained by multiplying the constant set on the operation panel by the reference value. Thus, the user can determine the overall tendency of the transition time to the power saving mode by setting the coefficient.

  According to a fifth aspect of the present invention, in the second to fourth aspects of the invention, the operation panel accepts a setting of a shortest transition time which is the shortest time of the transition time, and the power supply unit presses the key. When the input is made to the operation panel a plurality of times, when the shortest transition time elapses without any operation or input to the operation input detection unit after the job is not executed. It was decided to shift to the power saving mode.

  According to this configuration, the operation panel accepts the setting of the shortest transition time. Thereby, the user can set the shortest transition time that should be secured as a minimum as the transition time to the power saving mode. Also, when the time when the constant multiplied by the reference value is shorter than the shortest transition time, the operation input to the operation input detection unit is not performed after the job is not executed. If the shortest transition time elapses without any change, the power saving mode is entered. Thereby, the shortest transition time is secured as the transition time to the power saving mode, and the transition to the power saving mode at a timing contrary to the user's intention, such as the transition to the power saving mode during operation, is prevented. In other words, premature transition to the power saving mode can be prevented.

  According to a sixth aspect of the present invention, in the first to fifth aspects of the invention, the operation panel accepts a setting of a normal transition time that is a transition time when the time measuring unit is not measuring the interval, After the main power supply of the image forming apparatus is turned on or after the return to the normal mode, the power supply unit is in a state in which no job is being executed when the time measuring unit is not measuring the interval, and then the operation panel When the normal transition time has passed without any operation or input to the operation input detection unit other than the above, the mode is shifted to the power saving mode.

  According to this configuration, after the main power supply of the image forming apparatus is turned on or after returning to the normal mode, the power supply unit does not execute the job when the time measuring unit does not measure the interval. When the normal transition time has passed without any operation or input to the operation input detection unit other than the operation panel, the mode is shifted to the power saving mode. As a result, even when the operation mode is erroneously restored to the normal mode, the operation mode is shifted to the power saving mode even if the operation panel is not operated and the interval is not measured.

  According to a seventh aspect of the present invention, in the first to sixth aspects of the invention, the power supply unit has shifted to the power saving mode based on the interval measured by the timekeeping unit, but a predetermined designated time has elapsed. Before returning to the normal mode, the transition time until the next transition to the power saving mode is made longer than the transition time for the transition to the previous power saving mode.

  If the transition time to the power saving mode is too short, the key may shift to the power saving mode during key operation (until the next key is pressed). In this case, the user returns the power saving mode to the normal mode and performs setting again. Therefore, according to this configuration, when the power supply unit shifts to the power saving mode based on the interval measured by the time measuring unit but returns to the normal mode before the predetermined specified time elapses, the next power saving unit The transition time until shifting to the mode is made longer than the transition time when shifting to the immediately preceding power saving mode. Thereby, when it is recognized that the transition time to the power saving mode is too short, the transition time can be lengthened and the transition to the power saving mode during key operation can be eliminated.

  The invention according to claim 8 is the invention according to claim 7, wherein the operation panel accepts the setting of the specified time, and the power supply unit enters the normal mode before the set specified time elapses. When returning, the transition time until the transition to the next power saving mode is made longer than the transition time at the time of transition to the immediately preceding power saving mode.

  According to this configuration, the operation panel accepts the setting of the specified time. As a result, the user can set a desired designated time.

  According to the present invention, the user's usage situation is recognized by measuring the interval at which the key is pressed. Then, the transition time to the power saving mode is adjusted and changed according to the interval at which the key is pressed. This makes it possible to promptly shift to the power saving mode and reduce power consumption while preventing the user from feeling uncomfortable.

1 is a schematic front cross-sectional view illustrating an example of a multifunction machine. 3 is a plan view illustrating an example of an operation panel of the 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 the electric power supply system of a multifunction device. It is a block diagram for demonstrating the operation input detection part. It is explanatory drawing for demonstrating transfer to the power saving mode according to the input timing of a key. It is explanatory drawing which shows an example of a power saving mode transfer setting screen. 5 is a flowchart illustrating an example of state transition between a normal mode and a power saving mode of a multifunction machine.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. In the present embodiment, description will be given by taking the multifunction peripheral 100 (corresponding to an image forming apparatus) 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 multi-function device 100 can execute a plurality of types of jobs (functions) such as copy, print, and scan transmission. The multi-function machine 100 is provided with a document conveying device 1a (corresponding to a job execution unit) at the top. The document conveying device 1a conveys documents stacked on the document placing tray 11 one by one to a reading position (a position above the feed reading contact glass 14a) of the image reading unit 1b (corresponding to a job execution unit). The document placement tray 11 is provided with a document placement detection sensor 12 (corresponding to an operation input detection unit) for detecting that a document is placed. The document placement detection sensor 12 is, for example, an optical sensor, and the output changes between when the document is placed and when no document is placed.

  The document conveying device 1a is opened upward by a fulcrum (not shown) provided on the back side of the sheet. For example, a document such as a book can be placed on the placement reading contact glass 14b on the upper surface of the image reading unit 1b. As shown by a broken line in FIG. 1, an open / close detection sensor 13 (corresponding to an operation input detection unit) is provided for detecting whether the document conveying device 1a is open or closed. For example, the open / close detection sensor 13 may be an interlock type switch in contact with the lower surface of the document conveying apparatus 1a or a reflection type optical sensor as long as the open / closed state can be detected.

  Next, as indicated by a broken line in FIG. 1, an operation panel 2 that accepts settings such as copying and input of execution instructions and displays various types of information is provided above the front (corresponding to an operation input detection unit). Further, the MFP 100 main body is provided with an image reading unit 1b, a sheet feeding unit 3, a conveyance path 4, an image forming unit 5, a fixing unit 6, and the like.

  The image reading unit 1b reads a document and generates image data when performing a copy, scan, or image data transmission job. A contact glass 14 (two types of 14a and 14b) is provided on the upper surface of the image reading unit 1b. In addition, optical system members such as a moving frame (including an exposure lamp, a mirror, etc.) that moves in the horizontal direction (left-right direction in FIG. 1), a lens, and an image sensor (for example, a CCD) (Not shown) is provided. For example, when a document conveyed continuously by the document conveying device 1a is read, a moving frame is fixed below the feed reading contact glass 14a, and the reflected light of the document is guided to a lens and an image sensor. Further, when reading a document placed on the placement reading contact glass 14b, 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 multi-function device 100 can print based on the read image data (copy function). The multi-function device 100 can transmit the read image data (FAX, scan function).

  In the multifunction peripheral 100 of the present embodiment, a total of three cassettes 31 (31a, 31b, 31c) are stacked in the vertical direction on the paper feed unit 3 that accommodates and supplies paper for image formation. The paper feed unit 3 has various types (for example, plain paper, copy paper, recycled paper, etc.) and a plurality of sheets (for example, about 500 to 1000 sheets) of each size (for example, A4, A3, B4, B5, letter size, etc.). ) Load and store.

  Each cassette 31 (31a to 31c) is provided with a paper feed roller 32 that is rotationally driven for paper supply. Of the sheets stacked on the sheet placing plate in each cassette 31 (31 a to 31 c), the uppermost sheet contacts the sheet feeding roller 32. Each cassette 31 can be inserted and removed for paper supply. In order to detect whether each cassette 31 is attached or removed, an insertion / removal detection sensor 33 (corresponding to an operation input detection unit) is provided. For example, the insertion / removal detection sensor 33 may be an interlock type switch in contact with one surface of each cassette 31 or a reflection type optical sensor as long as it can detect the insertion / removal state.

  Next, the transport path 4 is a path for transporting paper in the apparatus. In the transport path 4, a plurality of transport roller pairs 41 that are rotationally driven during transport of paper (in FIG. 1, a total of seven from 41 a to 41 g are illustrated from the upstream side) and the transported paper are fed to the image forming unit 5. A registration roller pair 42 that waits in front and sends out the toner image formation timing is provided.

  Note that the front cover (not shown) of the multifunction peripheral 100 according to the present embodiment can be opened and closed for the removal of jammed paper and maintenance. A cover opening / closing detection sensor 43 (corresponding to an operation input detection unit) is provided for detecting the opening / closing of the front cover. The cover open / close detection sensor 43 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 opening and closing of the front cover.

  The image forming unit 5 forms an image (toner image) on a sheet fed from the sheet feeding unit 3 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 and image data received from the computer 200 (see FIG. 3) or the FAX apparatus 300 are used. The image forming unit 5 includes a photosensitive drum 51 that is rotationally driven in the direction of the arrow shown in FIG. 1, a charging device 52, an exposure device 53, a developing device 54, a transfer roller 55, and a cleaning device 56 arranged around the photosensitive drum 51. Etc.

  The toner image formation and transfer process will be described. When forming a toner image, the photosensitive drum 51 is driven to rotate. The charging device 52 charges the photosensitive drum 51 to a predetermined potential. The exposure device 53 outputs a laser beam L based on the image data, scans and exposes the surface of the photosensitive drum 51, and forms an electrostatic latent image corresponding to the image data. The developing device 54 supplies toner to the electrostatic latent image formed on the photosensitive drum 51 and develops it. The transfer roller 55 is pressed against the photosensitive drum 51 to form a nip. Then, the registration roller pair 42 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 55, and the toner image on the photosensitive drum 51 is transferred to the paper. The cleaning device 56 removes the toner remaining on the photosensitive drum 51 after the transfer.

  The fixing unit 6 fixes the toner image transferred to the paper. The fixing unit 6 in the present embodiment is mainly composed of a heating roller 61 and a pressure roller 62 that incorporate a heating element. The heating roller 61 and the pressure roller 62 are pressed to form a nip. Then, as 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 44.

(Operation panel 2)
Next, an example of the operation panel 2 of the multifunction peripheral 100 according to the embodiment of the present invention will be described with reference to FIG. FIG. 2 is a plan view illustrating an example of the operation panel 2 of the multifunction peripheral 100.

  The operation panel 2 is provided above the front surface of the multifunction peripheral 100 as indicated by a broken line in FIG. The operation panel 2 includes a plurality of keys such as a power key 23, a numeric keypad 24, and a start key 25 in addition to the liquid crystal display unit 21 and the touch panel unit 22.

  The liquid crystal display unit 21 displays information related to printing, displays the status of printing, errors, and the like on the multifunction device 100. In addition, the liquid crystal display unit 21 displays, for example, the paper size used for printing, enlargement / reduction, and density setting on the multifunction device 100. Displays a key for selecting a setting item and setting a setting value for the selected setting item. The pressed key among the keys displayed on the liquid crystal display unit 21 by the detection of the pressed position coordinates by the touch panel unit 22 (corresponding to the operation input detection unit) provided for the liquid crystal display unit 21 is the operation panel. 2 is recognized. Accordingly, the user can set various functions of the multifunction peripheral 100.

  The power key 23 is a key for instructing ON / OFF of the main power supply of the multifunction peripheral 100. As for the power source of the multifunction peripheral 100, a power switch (not shown, for example, a mechanical switch) is also provided separately from the power key 23. For example, the power source of the multifunction device 100 is basically shut off when this power switch is turned off. The numeric keypad 24 is configured by combining the keys of 0-9, *, #, and symbols, and is used when inputting numbers such as printing copy number input and FAX number input. The start key 25 is pressed when instructing the start of a copy or scan job after the setting is completed on the liquid crystal display unit 21 or the numeric keypad unit 24. As described above, the operation panel 2 includes soft keys displayed on the liquid crystal display unit 21 and hard keys such as the numeric keypad 24 and the start key 25 as keys for instructing setting input and job execution.

(Hardware configuration of MFP 100)
Next, the hardware configuration of the multifunction peripheral 100 according to the embodiment will be described with reference to FIG. FIG. 3 is a block diagram illustrating an example of a hardware configuration of the multifunction peripheral 100.

  As illustrated in FIG. 3, the multifunction peripheral 100 according to the present embodiment includes a main control unit 7 (corresponding to a control unit) configured by combining various elements, circuits, and the like. The main control unit 7 is communicably connected to the image reading unit 1b, the document conveying device 1a, the operation panel 2, the print engine unit 101 (corresponding to the job execution unit), the power supply unit 8, and the like, and performs communication to control operations. To do.

  The main control unit 7 includes, for example, a main CPU 71, a storage unit 72, an image processing unit 73, a timing unit 74, a communication unit 75 (corresponding to a job execution unit and an operation input detection unit), and the like.

  The main CPU 71 is an arithmetic processing unit of the main control unit 7, and performs processing and control based on data and programs stored in the storage unit 72. The storage unit 72 is configured by combining, for example, a nonvolatile storage device (flash ROM) and a volatile storage device (for example, RAM). The storage unit 72 stores data and programs required for various controls such as job execution. The main control unit 7 can be connected to an HDD 76 as a large-capacity storage device, and the main control unit 7 can use the HDD 76 as one of the storage devices. For example, the HDD 76 stores image data in addition to data and programs required for various controls.

  The image processing unit 73 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 73 includes an ASIC dedicated to image processing and a memory for image processing. The image data after image processing can be sent to the exposure device 53 for printing (copy function, printer function), stored in the HDD 76 (scanner function), or externally (computer) from the communication unit 75 described later. 200, FAX apparatus 300, etc.) (scanner function, FAX function). The image processing unit 73 may be functionally realized by the main CPU 71 and the storage unit 72. Further, the image processing that can be performed by the image processing unit 73 is diverse, such as enlargement / reduction processing, density change, and the like.

  The timer unit 74 is a circuit that measures time. For example, the time measuring unit 74 measures the intervals at which keys displayed on the liquid crystal display unit 21 of the operation panel 2 and various hard keys of the operation panel 2 are pressed. The communication unit 75 is an interface for communicating with an external computer 200 (for example, a personal computer or server) or the FAX apparatus 300 through a network, a line, a cable, or the like. Therefore, the communication unit 75 includes various connectors, communication circuits, elements, controllers, and the like. The main control unit 7 can receive print data from the external computer 200 and the FAX apparatus 300 through communication via the communication unit 75 and transmit image data to the external computer 200 and the FAX apparatus 300.

  Further, regarding the reading of the document, the main control unit 7 is communicably connected to the image reading unit 1b and the document conveying device 1a. When performing a copy or image data transmission job, the image reading unit 1b and the document conveying device 1a execute a job for reading a document in response to an instruction from the main control unit 7.

  The main control unit 7 is communicably connected to the operation panel 2 that performs setting input and display to the multifunction peripheral 100. The operation panel 2 transmits to the main control unit 7 that the key has been pressed and the type of the pressed key. Thereby, the main control unit 7 recognizes which key is pressed among the hard keys of the operation panel 2 or the keys displayed on the liquid crystal display unit 21. The time measuring unit 74 measures an interval at which a key is pressed on the operation panel 2.

  Next, a print engine unit 101 is provided as a part for executing a print job in the multifunction peripheral 100. The print engine unit 101 includes the paper feeding unit 3, the conveyance path 4, the image forming unit 5, the fixing unit 6 and the like described above. In the print engine unit 101, an engine control unit 77 that receives an instruction from the main control unit 7 and actually controls the operation of the print engine unit 101 is provided. The engine control unit 77 is composed of, for example, a CPU and a memory. The engine control unit 77 controls members included in the print engine unit 101, such as paper feeding, conveyance, toner image formation, and temperature control of the fixing unit 6.

  In addition, a power supply unit 8 is provided as a part related to power management in the multifunction peripheral 100. The power supply unit 8 controls power supply to each unit in the multifunction peripheral 100. For example, the power supply unit 8 includes a power supply device 81, a power control CPU 82 as an arithmetic processing unit, a memory 83 that stores data and programs for the power supply unit 8, a switch unit 84, an I / F unit 85, and the like.

  The power supply device 81 of the power supply unit 8 includes a rectifier circuit, a booster circuit, a step-down circuit, and the like, and is connected to a commercial power supply to generate a plurality of types of voltages necessary for the operation of the multifunction device 100. The switch unit 84 of the power supply unit 8 turns on / off the power supply to each unit of the multifunction peripheral 100 such as the main control unit 7. In other words, the power supply unit 8 opens and closes the power supply line from the power supply device 81 to the main control unit 7 and the like by the switch unit 84 and controls ON / OFF of the power supply to each unit. The I / F unit 85 receives an interrupt from an operation input detection unit that detects that an operation or an input has been performed on the multifunction peripheral 100. When the MFP 100 is in the power saving mode, the power supply unit 8 resumes power supply to the main control unit 7 and the like using an interrupt as a trigger.

(Outline of power supply system)
Next, an example of the power supply system of the multifunction peripheral 100 according to the embodiment will be described with reference to FIG. FIG. 4 is a block diagram illustrating an example of the power supply system of the multifunction peripheral 100.

  As described above, the power supply device 81 of the power supply unit 8 generates various voltages. As shown in FIG. 4, the power supply unit 8 includes a switch unit 84. The switch unit 84 includes a plurality of semiconductor switches such as FETs and bipolar transistors, mechanical switches, and the like. The switch unit 84 is turned ON / OFF to switch between energization and interruption of the main control unit 7, the image reading unit 1b, the operation panel 2, the print engine unit 101, the document conveying device 1a, and the like.

  In the normal mode, the power supply unit 8 supplies power to all parts in the multifunction peripheral 100 such as the main control unit 7, the image reading unit 1b, the operation panel 2, the print engine unit 101, and the document conveying device 1a. To do. Then, the power supply unit 8 maintains a state in which all types of jobs can be executed. On the other hand, when the condition for shifting to the power saving mode is satisfied, the power supply unit 8 stops supplying power to the main control unit 7, the image reading unit 1b, the operation panel 2, the print engine unit 101, the document conveying device 1a, and the like. Reduce power consumption.

  As indicated by a broken line in FIG. 4, the power supply unit 8 supplies power to each operation input detection unit even in the power saving mode in order to return to the normal mode.

(Operation input detector)
Next, an example of the operation input detection unit in the multifunction peripheral 100 according to the embodiment will be described with reference to FIGS. 4 and 5. FIG. 5 is a block diagram for explaining the operation input detection unit.

  After entering the normal mode, a predetermined transition time elapses without any operation or input to the operation input detection unit, or a predetermined operation is performed without any operation or input to the operation input detection unit after the job execution is completed. When the transition time elapses (when the standby state continues for a predetermined transition time), the main control unit 7 shifts the mode of the multifunction peripheral 100 to the power saving mode.

  A plurality of operation input detection units are provided in the multifunction peripheral 100. In the normal mode, the output of each operation input detection unit is transmitted to the main control unit 7. Based on the output of each operation input detection unit, the main control unit 7 recognizes whether a predetermined transition time has elapsed without any operation or input to the operation input detection unit.

  First, as an operation input detection unit in the main control unit 7, for example, there is a communication unit 75. When the communication unit 75 receives print image data or print setting data from the external computer 200 or receives FAX data from the FAX apparatus 300, the main control unit 7 performs operations and inputs to the multifunction peripheral 100. The transition time count is reset.

  An example of the operation input detection unit in the multifunction peripheral 100 is the touch panel unit 22 of the operation panel 2. When the touch panel unit 22 is pressed and the setting input and operation are performed, the main control unit 7 recognizes that the operation and input to the multi-function device 100 are performed, and resets the transition time count.

  Examples of the operation input detection unit related to the print engine unit 101 of the multifunction peripheral 100 include an insertion / removal detection sensor 33 that detects insertion / removal of the cassette 31 and a cover opening / closing detection sensor 43 that detects opening / closing of the cover. Further, based on the outputs of the insertion / removal detection sensor 33 and the cover opening / closing detection sensor 43, the main control unit 7 resets the transition time count when recognizing an operation or input to the multifunction peripheral 100.

  The operation input detection unit related to the document conveyance device 1a of the multifunction peripheral 100 includes, for example, a document placement detection sensor 12 that detects document placement on the document placement tray 11, and a raising / lowering (opening / closing) of the document conveyance device 1a. There is an open / close detection sensor 13 for detecting the. Based on the outputs of the document placement detection sensor 12 and the open / close detection sensor 13, the main control unit 7 resets the transition time count when it recognizes an operation or input to the multifunction peripheral 100.

  When the transition time elapses without any operation or input for each operation input detection unit, the main control unit 7 instructs the power supply unit 8 to shift to the power saving mode. Thereby, the power supply mode of the power supply unit 8 becomes the power saving mode.

  In the power saving mode, the power supply unit 8 stops supplying power to the main control unit 7, the image reading unit 1b, the operation panel 2, the print engine unit 101, the document conveying device 1a, and the like. For this reason, since the power supply to the job execution unit that performs copying, scanning, transmission, and the like is stopped, the functions of the MFP 100 such as copying, scanning, and transmission cannot be used. Therefore, in order for the user to use the MFP 100, the power supply mode of the power supply unit 8 is returned from the power saving mode to the normal mode, and the main control unit 7, the image reading unit 1b, the operation panel 2, and the print engine unit 101 are restored. Therefore, it is necessary to restart the power supply to the document feeder 1a and the like.

  The power supply unit 8 receives an interrupt from each operation input detection unit as a trigger for returning from the power saving mode to the normal mode. When this interruption occurs, the power supply unit 8 resumes power supply to the main control unit 7, the image reading unit 1 b, the operation panel 2, the print engine unit 101, the document conveyance device 1 a, etc. The power mode is returned to the normal mode (see FIG. 5).

  When the communication unit 75 as an operation input detection unit receives image data or the like from the external computer 200 or the FAX apparatus 300, the communication unit 75 generates an interrupt and inputs the interrupt to the power supply unit 8 (interrupt A in FIG. 5). Further, the touch panel unit 22 as an operation input detection unit in the operation panel 2 generates an interrupt by a user's touch operation and inputs the interrupt to the power supply unit 8 (interrupt B in FIG. 5). Further, the operation panel 2 may generate an interrupt even when any hard key is pressed, and input it to the power supply unit 8.

  Further, the insertion / removal detection sensor 33, which is an operation input detection unit of the print engine unit 101, generates an interrupt and inputs it to the power supply unit 8 when it detects removal and attachment due to paper replenishment or replacement (interrupt in FIG. 5). C). The cover open / close detection sensor 43, which is an operation input detection unit in the print engine unit 101, generates an interrupt when it detects an operation (open / close) of the housing cover for maintenance, consumable replacement, or paper jam handling. And input to the power supply unit 8 (interrupt D in FIG. 5).

  Further, a document placement detection sensor 12 (interrupt E in FIG. 5) for detecting the placement of the document on the document placement tray 11 and an open / close detection sensor 13 (interrupt in FIG. 5) for detecting the raising and lowering of the document transport device 1a. When F) detects an operation (document placement or raising / lowering) on the document conveying device 1 a for copying or the like, an interrupt is generated and input to the power supply unit 8.

  The power supply unit 8 receives an input (interrupt) from each operation input detection unit, and if there is an interrupt, the power supply unit 8 returns the multifunction peripheral 100 from the power saving mode to the normal mode. The power supply to the unit 7 and the functional block is resumed.

(Transition to power saving mode according to key input interval)
Next, the outline of the shift to the power saving mode corresponding to the key input interval will be described with reference to FIG. FIG. 6 is an explanatory diagram for explaining the shift to the power saving mode in accordance with the key input timing.

  In the MFP 100 according to the present embodiment, the main control unit 7 shifts from the normal mode to the power saving mode based on the interval at which a key displayed on the liquid crystal display unit 21 of the operation panel 2 or a hard key such as the numeric keypad unit 24 is pressed. Determine the transition time to complete. When an operation input detection unit other than the operation panel 2 detects an operation or input to the multi-function device 100, the main control unit 7 waits for a predetermined normal transition after there is no operation or input to the multi-function device 100. After the elapse of time, the power supply unit 8 is instructed to shift to the power saving mode.

  For users with short key press intervals (users who are accustomed to the operation by pressing the key quickly), when the job such as copying, scanning, sending, etc. is finished, the settings of the next job are set in the operation panel within a short time. 2 tend to do. On the other hand, users with long key press intervals (users who are slow to press keys and are not familiar with the operation) have passed more time than users who are familiar with the operation after the job such as copying. Therefore, the setting of the next job tends to be performed on the operation panel 2.

  Therefore, in the normal mode, the main control unit 7 uses the time measuring unit 74 to measure an interval at which a key is pressed on the operation panel 2. Then, the main control unit 7 determines the transition time to the power saving mode by multiplying the interval at which the key is pressed by a constant.

  For example, FIG. 6A shows an example in which the interval at which the key is pressed is longer than that in FIG. FIG. 6A shows an example in which the key press interval is measured as 10 seconds, 15 seconds, and 20 seconds until the start key 25 is pressed for job execution. At this time, the main control unit 7 determines, for example, the longest 20 seconds as the key pressing interval as a reference value for determining the transition time. Then, the main control unit 7 determines the transition time by multiplying the reference value by a predetermined constant. For example, if the constant is 3, the transition time is 20 × 3 = 60 seconds. In this case, when 60 seconds elapse without any operation or input to the operation input detection unit after the job is not executed, the main control unit 7 switches the power supply unit 8 to the power saving mode. Instruct the migration. For example, when 60 seconds have passed without any operation or input to the operation input detection unit since the last time the key was pressed on the operation panel 2, the main control unit 7 switches the power supply unit 8 to the power saving mode. Instruct the migration.

  The main control unit 7 determines the reference value based on the measured key press interval after entering the normal mode. In the above description, the example in which the longest interval among the intervals measured after the normal mode is set as the reference value has been described. However, the main control unit 7 may use an average value of the measured intervals as a reference value (for example, 15 seconds in the example of FIG. 6A). In consideration of the case where the user is changed in the middle, the nth (for example, the third) interval counted from the longest interval among the measured intervals may be used as the reference value. Or the main control part 7 is good also considering the shortest space | interval as a reference value among the space | intervals which press the key measured after becoming normal mode.

  On the other hand, FIG. 6B shows an example in which the interval at which the key is pressed is shorter than that in FIG. In the case of FIG. 6B, until the setting key displayed on the liquid crystal display unit 21 or the start key 25 is pressed for job execution, the interval between pressing keys is measured as 2 seconds, 3 seconds, and 4 seconds. An example is shown. At this time, the main control unit 7 determines, for example, the longest 4 seconds as the key pressing interval as a reference value for determining the transition time. Then, the main control unit 7 determines the transition time by multiplying the reference value by a predetermined constant. For example, if the constant is 3, the transition time is 4 × 3 = 12 seconds.

  Here, in the MFP 100 according to the present embodiment, when a key is input to the operation panel 2, at least until the job is completed, the operation input detection unit has no operation, and no input is entered, the mode is shifted to the power saving mode. As the time to be secured, the shortest transition time is determined in advance. As shown in FIG. 6B, when the transition time obtained by multiplying the reference value by a constant is shorter than the shortest transition time, the main control unit 7 operates after the job is not executed. When the shortest transition time elapses without any operation or input to the input detection unit, the power supply unit 8 is instructed to shift to the power saving mode. For example, when the shortest transition time elapses without any operation or input to the operation input detection unit since the key was last pressed on the operation panel 2, the main control unit 7 switches the power supply unit 8 to the power saving mode. Instruct to migrate.

  In addition, when the main power is turned on or the power saving mode is restored, the mode may be shifted to the power saving mode without pressing the key on the operation panel 2 after the normal mode is set. For example, when image data or the like is received from the computer 200 and printed as a printer or transmitted to the FAX apparatus 300 or the like, the MFP 100 is used after returning from the power saving mode to the normal mode. This corresponds to the case of shifting to the power saving mode.

  In this case, the interval at which the key is pressed cannot be measured. Therefore, after the main control unit 7 enters the normal mode and does not execute the job, the main control unit 7 performs a predetermined normal transition without any operation or input to the operation input detection unit other than the operation panel 2. When time elapses, the power supply unit 8 is instructed to shift to the power saving mode.

(Settings related to transition to power saving mode)
Next, settings related to the power saving mode transition will be described with reference to FIG. FIG. 7 is an explanatory diagram showing an example of the power saving mode transition setting screen 9.

  In the present embodiment, when a predetermined operation is performed on the operation panel 2, the operation panel 2 causes the liquid crystal display unit 21 to display a power saving mode transition setting screen 9 as shown in FIG. The user can make settings for the power saving mode by inputting to the power saving mode transition setting screen 9.

  For example, the power saving mode transition setting screen 9 is provided with a constant setting field 91 for setting a constant to be multiplied by a reference value determined based on an interval at which a key is pressed. The user can set a constant. For example, when setting a constant, the constant setting field 91 is pressed and the constant is input using the numeric keypad 24 or the like. The larger the input constant, the longer the transition time to the power saving mode.

  Further, on the power saving mode transition setting screen 9, the user can set how to determine the reference value based on the interval at which the key is pressed on the operation panel 2. For example, three radio buttons are provided for determining the reference value. When the maximum (longest) interval among the measured intervals is used as a reference value, the radio button R1 is pressed. When the average of the plurality of measured intervals is obtained and the average value is used as a reference value, the radio button R2 is pressed. When the minimum (shortest) interval among the measured intervals is used as a reference value, the radio button R3 is pressed.

  The power saving mode transition setting screen 9 is provided with a shortest transition time setting field 92 for setting the minimum transition time to be secured at the minimum when shifting to the power saving mode. When setting the shortest transition time, the user presses the shortest transition time setting field 92 and inputs the desired shortest transition time using the numeric keypad 24 or the like.

  The power saving mode transition setting screen 9 shows the transition time when there is no key input to the operation panel 2 when the transition to the power saving mode is not made (when the interval at which the key is pressed on the operation panel 2 cannot be measured). The normal transition time setting field 93 is provided. When setting the normal transition time, the user presses the normal transition time setting field 93 and inputs a desired normal transition time using the numeric keypad 24 or the like.

  The power saving mode transition setting screen 9 is provided with a designated time setting field 94 for setting a designated time. When the time from the transition to the power saving mode to the return to the normal mode is shorter than the specified time based on the interval at which the key is pressed on the operation panel 2, the transition time to the next power saving mode is lengthened. Can do. Note that, for example, the power control CPU 82 of the power supply unit 8 measures whether or not the time from the transition to the power saving mode to the return to the normal mode is shorter than the specified time. When setting the designated time, the user presses the designated time setting field 94 and inputs the desired designated time using the numeric keypad 24 or the like.

  On the power saving mode transition setting screen 9, it is possible to set whether or not to increase the transition time when the time until returning from the power saving mode to the normal mode is shorter than the specified time. Two radio buttons are provided to set whether to increase the transition time. When increasing the transition time, the radio button R4 is pressed. When the transition time is not increased specially, the radio button R5 is pressed.

  When the time until returning from the power saving mode to the normal mode is shorter than the specified time and the radio button R4 is pressed to increase the transition time, for example, the main control unit 7 Even if the key on the operation panel 2 is pressed a plurality of times, the transition time is set as the normal transition time. Alternatively, the main control unit 7 may add, for example, about several tens of seconds to several minutes to the transition time (the transition time obtained by multiplying the reference value by a constant) in the transition to the previous power saving mode. Thus, when the main control unit 7 returns to the normal mode before the specified time elapses, the main control unit 7 lengthens the transition time until the transition to the next power saving mode.

  Below the power saving mode transition setting screen 9, an OK key K1 is arranged. When the setting on the power saving mode transition setting screen 9 is completed, the user presses the OK key K1. When the OK key K1 is pressed, the operation panel 2 transmits the setting contents to the main control unit 7 and the power supply unit 8. The storage unit 72 of the main control unit 7 and the memory 83 of the power supply unit 8 store the setting contents on the power saving mode setting screen, and operate according to the set contents.

(Transition control between power saving mode and normal mode)
Next, transition control between the power saving mode and the normal mode in the MFP 100 according to the present embodiment will be described with reference to FIG. FIG. 8 is a flowchart illustrating an example of state transition of the MFP 100 between the normal mode and the power saving mode.

  The start of FIG. 8 is the time when the main power supply of the multifunction peripheral 100 is turned on (the power key 23 is turned on). Thereby, the warm-up of the multifunction device 100 is started.

  At this time, the main control unit 7 causes the power supply unit 8 to supply power in the normal mode (step # 1). In other words, the main control unit 7 causes the power supply unit 8 to supply power to all the parts of the multi-function device 100 to perform warm-up so that all functions of the multi-function device 100 can be used.

  After the warm-up is completed (step # 2), the main control unit 7 has returned from the power saving mode to the normal mode within a shorter time than the specified time, and thus confirms whether the transition time should be lengthened (step 3). The main control unit 7 receives a notification from the power supply unit 8 that the power saving mode has returned to the normal mode for a shorter time than the specified time, and that the power control mode has returned to the normal mode for a shorter time than the specified time. recognize.

  When the transition time should be longer than the previous transition to the power saving mode (Yes in step # 3), the main control unit 7 sets a longer time than the previous transition to the power saving mode to the current power saving mode. The transition time to the mode is determined (step # 4). Then, the main control unit 7 enters a state in which no job is being executed, confirms whether the transition time set in step # 4 has passed without any operation or input to the operation input detection unit, and saves power. It continues to check whether or not the condition for shifting to the mode is satisfied (step # 5, step # 5 loop).

  If the transition condition is satisfied (Yes in step # 5), the main control unit 7 instructs the power supply unit 8 to shift to the power saving mode, and the power supply unit 8 supplies power in the power saving mode. Then, the multi-function device 100 is set to the power saving mode (step # 6).

  On the other hand, when it is not necessary to lengthen the transition time (No in Step # 3), it is confirmed whether or not the key has been pressed a plurality of times on the operation panel 2 after entering the normal mode (Step # 7). If the key is pressed (Yes in Step # 7), the main control unit 7 obtains the transition time based on the measured key pressing interval (Step # 8). Then, the main control unit 7 confirms whether the obtained transition time has passed without any operation or input to the operation input detection unit since the job is not executed, and the power saving mode It is confirmed whether or not the condition for shifting to is satisfied (step # 9).

  If the transition condition is satisfied (Yes in step # 9), the main control unit 7 instructs the power supply unit 8 to shift to the power saving mode, and the power supply unit 8 supplies power in the power saving mode. Then, the multi-function device 100 is set to the power saving mode (step # 6). On the other hand, if the transition condition is not satisfied and the normal mode should be maintained (No in step # 9), the flow returns to step # 7.

  On the other hand, when the key on the operation panel 2 is not pressed a plurality of times (No in step # 7), the main control unit 7 does not execute the job, and then the operation input detection unit other than the operation panel 2 It is confirmed whether or not the normal transition time has passed without any operation or input, and whether or not the condition for shifting to the power saving mode is satisfied (step # 10).

  If the transition condition is satisfied (Yes in step # 10), the main control unit 7 instructs the power supply unit 8 to shift to the power saving mode, and the power supply unit 8 supplies power in the power saving mode. Then, the multi-function device 100 is set to the power saving mode (step # 6). On the other hand, if the transition condition is not satisfied and the normal mode should be maintained (No in step # 10), the flow returns to step # 7.

  When shifting to the power saving mode, the power supply unit 8 confirms whether an interrupt from any of the operation input detection units is input to the I / F unit 85, and whether the condition for returning to the normal mode is satisfied. (Step # 11, No in Step # 11 → Step # 11). If there is an interrupt input to the power supply unit 8 and the condition for returning to the normal mode is satisfied (Yes in step # 11), the flow returns to step # 1.

  This flowchart is continued until the main power is turned off by the power key 23 OFF of the multifunction machine 100.

  In this manner, the image forming apparatus (for example, the multifunction peripheral 100) of the present embodiment is configured with a job execution unit (print engine unit 101, image reading unit 1b, document conveying device 1a, communication unit 75, etc.) that executes a job. , Including an operation panel 2 for accepting job setting input, an operation input detection unit (operation panel 2, communication unit 75, touch panel unit 22, insertion / removal detection sensor 33, cover open / close detection sensor for detecting operation and input to the image forming apparatus) 43, the document placement detection sensor 12, the open / close detection sensor 13 and the like), the time measuring unit 74 that measures the interval at which the key relating to the setting is pressed on the operation panel 2, and the longer the measured interval based on the measured interval, A control unit (main control unit 7) for obtaining a transition time so that the transition time from the normal mode to the power saving mode becomes longer, and a plurality of inputs for pressing a key in the normal mode. When the operation panel 2 is operated, the job is not being executed, and the transition determined by the control unit (main control unit 7) without any operation or input to the operation input detection unit. When the time elapses, the mode shifts to the power saving mode. In the power saving mode, at least the power supply to the job execution unit is stopped, and when the operation input detection unit detects an operation or input to the image forming apparatus in the power saving mode, the mode is changed to the normal mode. And a power supply unit 8 that supplies power to the job execution unit in the normal mode.

  The interval at which the setting key is pressed on the operation panel 2 is related to the user's operation with respect to the image forming apparatus (for example, the multifunction peripheral 100), the degree of setting familiarity, and the agility in using the image forming apparatus. As the user presses the key more frequently, the time from the completion of the job or the input of the last key to the next operation or input to the image forming apparatus tends to increase. On the other hand, users with short key press intervals tend to shorten the time until the next operation or input to the image forming apparatus after completion of a job or after the last key is input due to an agile operation. .

  Therefore, based on the measured interval, the control unit (main control unit 7) obtains the transition time so that the transition time from the normal mode to the power saving mode becomes longer as the measured interval is longer. Thereby, when the interval is short, the transition time to the power saving mode is shortened, and wasteful power consumption can be eliminated by promptly shifting to the power saving mode. On the other hand, when the interval is long, a user unfamiliar with the operation and input of the image forming apparatus (for example, the multifunction peripheral 100) tries to use the image forming apparatus again or input to the operation panel 2. Sometimes, the inconvenience that the image forming apparatus is in the power saving mode and must be waited until the image forming apparatus can be used can be eliminated. Therefore, it is possible to adjust and change the transition time to the power saving mode in accordance with the current usage status in accordance with the usage status of the user, the user's operation of the image forming apparatus, and input proficiency. And it can change to power saving mode promptly, making a user not feel hard to use.

  The control unit (main control unit 7) determines a reference value for determining the transition time based on the plurality of measured intervals, and obtains a time obtained by multiplying the reference value by a predetermined constant as the transition time. Thereby, the transition time to the power saving mode can be adjusted and changed according to the interval at which the key is pressed.

  Further, the control unit (main control unit 7) determines an average value of the plurality of measured intervals or one interval among the plurality of intervals as a reference value. As a result, the transition time to the power saving mode can be determined based on the interval recognized as appropriate.

  The operation panel 2 accepts the setting of constants, and the control unit (main control unit 7) obtains the time obtained by multiplying the constants set on the operation panel 2 by the reference value as the transition time. Thus, the user can determine the overall tendency of the transition time to the power saving mode by setting the coefficient.

  The operation panel 2 accepts the setting of the shortest transition time, which is the shortest transition time, and the power supply unit 8 executes a job when an input to press a key is made to the operation panel 2 a plurality of times. The operation input detection unit (operation panel 2, communication unit 75, touch panel unit 22, insertion / removal detection sensor 33, cover open / close detection sensor 43, document placement detection sensor 12, open / close detection sensor 13, etc.) If the shortest transition time elapses without any operation or input, the power saving mode is entered. Thereby, the user can set the shortest transition time that should be secured as a minimum as the transition time to the power saving mode. Further, the shortest transition time is secured as the transition time to the power saving mode, and the transition to the power saving mode at a timing contrary to the user's intention, such as the transition to the power saving mode during operation, is prevented. In other words, premature transition to the power saving mode can be prevented.

  The operation panel 2 accepts the setting of the normal transition time, which is the transition time when the time measuring unit 74 is not measuring the interval, and the power supply unit 8 turns on the main power of the image forming apparatus (for example, the multifunction peripheral 100). After or after returning to the normal mode, when the time measuring unit 74 has not measured the interval, the operation input detection unit (communication unit 75, touch panel) other than the operation panel 2 is entered after the job is not executed. Unit 22, insertion / removal detection sensor 33, cover open / close detection sensor 43, document placement detection sensor 12, open / close detection sensor 13, etc.) Migrate to As a result, even if the operation panel 2 is not operated and the interval is not measured, such as when the power saving mode is erroneously returned to the normal mode, the normal mode is switched to the power saving mode.

  Also, if the transition time to the power saving mode is too short, the key may shift to the power saving mode during key operation (until the next key is pressed). In this case, the user returns the power saving mode to the normal mode and performs setting again. Therefore, when the power supply unit 8 shifts to the power saving mode based on the interval measured by the time measuring unit 74 but returns to the normal mode before a predetermined designated time elapses, it shifts to the next power saving mode. The transition time up to is made longer than the transition time at the time of transition to the immediately preceding power saving mode. Thereby, when it is recognized that the transition time to the power saving mode is too short, the transition time can be lengthened and the transition to the power saving mode during key operation can be eliminated.

  The operation panel 2 accepts the setting of the designated time, and the power supply unit 8 indicates the transition time until the transition to the next power saving mode when returning to the normal mode before the set designated time elapses. It is longer than the transition time at the time of transition to the power saving mode immediately before. As a result, the user can set a desired designated time.

  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.

  The present invention can be used for an image forming apparatus such as a copying machine, a multifunction machine, a printer, and a facsimile machine having a power saving mode and a normal mode.

100 MFP (image forming apparatus) 101 Print engine unit (job execution unit)
1a Document conveying device (job execution unit) 1b Image reading unit (job execution unit)
12 Document placement detection sensor (operation input detection unit)
13 Open / close detection sensor (operation input detector)
2 Operation panel (operation input detection unit) 22 Touch panel unit (operation input detection unit)
33 Insertion / removal detection sensor (operation input detection unit)
43 Cover open / close detection sensor (operation input detector)
7 Main control unit (control unit) 74 Timekeeping unit 75 Communication unit (job execution unit, operation input detection unit)
8 Power supply

Claims (8)

A job execution unit for executing a job;
An operation input detecting unit that includes an operation panel that accepts job setting input, detects an operation on the image forming apparatus, and an input;
A time measuring unit for measuring an interval of pressing a key on the operation panel;
Based on the measured interval, a control unit for obtaining the transition time so that the longer the measured interval, the longer the transition time from the normal mode to the power saving mode;
In normal mode, when an input to press the key is made to the operation panel a plurality of times, a job is not executed, and there is no operation or input to the operation input detection unit. When the transition time determined by the control unit elapses, the mode shifts to a power saving mode. In the power saving mode, at least power supply to the job execution unit is stopped, and the operation input detection unit images the image in the power saving mode. An image forming apparatus comprising: a power supply unit that returns to a normal mode when an operation or an input to the forming apparatus is detected and supplies power to the job execution unit in the normal mode.   The control unit determines a reference value for determining the transition time based on the plurality of measured intervals, and obtains a time obtained by multiplying the reference value by a predetermined constant as the transition time. The image forming apparatus according to claim 1.   The image forming apparatus according to claim 2, wherein the control unit determines an average value of the plurality of measured intervals or one of the plurality of intervals as the reference value. The operation panel accepts the setting of the constant,
The image forming apparatus according to claim 2, wherein the control unit obtains, as the transition time, a time obtained by multiplying the constant set by the operation panel by the reference value. The operation panel accepts the setting of the shortest transition time which is the shortest time of the transition time,
The power supply unit has no operation or input to the operation input detection unit after a job is not executed when an input to press the key is made to the operation panel a plurality of times. 5. The image forming apparatus according to claim 2, wherein the image forming apparatus shifts to the power saving mode when the shortest transition time elapses. The operation panel accepts a setting of a normal transition time that is a transition time when the time measuring unit does not measure the interval,
After the main power of the image forming apparatus is turned on or after the return to the normal mode, the power supply unit is in a state in which no job is executed when the time measurement unit does not measure the interval, 6. The power saving mode according to claim 1, wherein when the normal transition time elapses without any operation or input to an operation input detection unit other than a panel, the power saving mode is entered. The image forming apparatus described.   The power supply unit shifts to the power saving mode based on the interval measured by the timekeeping unit, but returns to the normal mode before a predetermined specified time elapses, and shifts to the next power saving mode. The image forming apparatus according to claim 1, wherein the transition time until the transition is made longer than the transition time at the time of transition to the immediately preceding power saving mode. The operation panel accepts the setting of the specified time,
When the power supply unit returns to the normal mode before the set specified time elapses, the power supply unit determines the transition time until the transition to the next power saving mode. The image forming apparatus according to claim 7, wherein the transition time is longer than the transition time.

Images