JP5292213B2 - Image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To intercept a power supply to a body control part in a sleep mode by providing a monitoring part for monitoring the occurrence of a return factor to a normal mode, and to simplify a configuration for the monitoring part as much as possible. <P>SOLUTION: The image forming apparatus having a normal mode and a sleep mode includes: an image forming mechanism; a body control part for controlling the image forming apparatus; a power supply part which does not supply power to the image forming mechanism and the body control part but supplies power to the monitoring part in the sleep mode; the monitoring part for monitoring whether the return factor from the sleep mode to a normal mode occurs and giving an instruction to the power supply part to carry out power supply in the normal mode when determined that the return factor has occurred; an interface part for transmitting a return signal to the monitoring part to the effect that the return factor has occurred by being operated; and an option device incorporated with the interface part that makes communication with the body control part after the body control part is started due to return to the normal mode. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to power reduction of an image forming apparatus such as a copying machine, a multifunction machine, a printer, and a facsimile machine in which an optional device is mounted.

  In general, an image forming apparatus such as a copying machine, a copying machine, or a printer, for example, supplies a power to each part of the image forming apparatus and maintains a printable state, and a part of the image forming apparatus such as an image forming part. It has a sleep mode to stop power supply to the configuration and save power. For example, when no operation is performed on the image forming apparatus for a predetermined time, the mode of the image forming apparatus is switched from the normal mode to the sleep mode. For example, when any operation or input is performed on the image forming apparatus or when printing is performed based on image data received from the network, the image forming apparatus returns from the sleep mode to the normal mode.

For example, Patent Document 1 describes a network device that returns from a power saving mode to a normal mode as necessary. Specifically, Patent Document 1 discloses a return condition for receiving and processing a data packet according to a specific protocol via a network and returning the device from a power saving state corresponding to the protocol according to the received data packet. There is described a network device including a setting unit for setting the network device and a return unit for returning the network device from the power saving state under a return condition set by the setting unit when a data packet conforming to a specific protocol is received. With this configuration, it is possible to cope with the problem that the number of times of returning from the sleep mode is increased due to unnecessary packet reception, and the function of the power saving mode is obstructed. Try to provide a high network device. (See Patent Document 1: Claim 1, paragraphs [0005], [0017], [0022], etc.).
JP 2006-309731 A

  For example, an optional device such as a billing device such as a coin vendor or an authentication device that authenticates whether the image forming device may be used by reading a magnetic card or an IC card may be attached to the image forming device. The operation of putting money into the charging device or reading the card is based on the intention to use the image forming apparatus, so it is necessary to return from the sleep mode to the normal mode so that the image forming apparatus can be used. In other words, the image forming apparatus returns from the sleep mode to the normal mode, triggered by the operation of the charging apparatus or the authentication apparatus such as money insertion (as a return factor).

  Here, the main body control unit is provided with a large number of chips, elements, circuits, and the like in order to perform various controls relating to the main body of the image forming apparatus. For this reason, even if processing such as printing is not performed, the power consumed by the main body control unit is relatively large. The charging apparatus and the authentication apparatus are communicably connected to a main body control unit that controls the image forming apparatus. Conventionally, the image forming apparatus main body side detects that the charging apparatus or the like has been operated to cause a return factor. Communication is always performed between the main body control unit and the charging device. That is, there is a problem that the main body control unit can be continuously driven even in the sleep mode. In other words, if the power supply to the main body control unit can be stopped in the sleep mode, the power saving effect is increased.

  In the invention described in Patent Document 1, there is no description regarding connection of an optional device such as a charging device or an authentication device. Further, since the image forming apparatus main body recognizes that a specific operation has been performed on the optional device, there is no description or suggestion regarding the problem that the main body control unit can continue to be driven even in the sleep mode. Therefore, the invention described in Patent Document 1 cannot solve the above problem.

  In view of the above problems, the present invention provides a monitoring unit that monitors the occurrence of a return factor from the sleep mode. In the sleep mode, the power supply to the main body control unit is interrupted to reduce power consumption. It is an object of the present invention to simplify the configuration as much as possible, and to prevent power and cost demerits even if a monitoring unit is provided.

An image forming apparatus according to claim 1 is an image forming apparatus having a normal mode and a sleep mode in which power consumption is reduced as compared with the normal mode, and an image forming mechanism for conveying paper and forming an image. A main body control unit that controls the operation of the image forming mechanism and controls the image forming apparatus, and supplies power to the image forming mechanism and the main body control unit in the normal mode, and the image forming mechanism and the main body in the sleep mode. A power supply unit that does not supply power to the control unit, and monitors whether a return factor from the sleep mode to the normal mode has occurred, and determines that the return factor has occurred. And an optional device for determining whether the image forming apparatus is allowed to be used. The return factor is generated by the operation. And an optional device that transmits data to be transmitted to the main body control unit, and the monitoring unit transmits only the return signal indicating that the return factor has occurred, the main body control unit, An option interface device that relays communication between the option devices, and the option interface device is connected to a signal transmission unit that transmits the return signal to a monitoring unit, the option device, and the main body control unit, A built-in interface unit that relays data communication between the main body control unit and the optional device after the main body control unit is activated by returning to the normal mode, and among the data received from the optional device, a return factor Only the data indicating the occurrence of the occurrence is selected, and the return signal is transmitted from the signal transmission unit to the monitoring unit .

When an existing optional device is attached, the main body control unit is usually driven even in the sleep mode in order to know that a return factor has occurred. On the other hand, the option interface device relays the exchange of signals and data between the option device and the image forming apparatus main body. Thereby, even if the existing optional device is attached, the power supply to the main body control unit in the sleep mode can be stopped, and the power saving effect is high. In addition, the configuration of the monitoring unit can be simplified. Further, the power supply of the main body control unit can be stopped in the sleep mode while changing the existing optional device without changing the configuration. In addition, the customer only needs to make an additional investment to install an optional interface device without purchasing a new optional device. Further, since the power supply to the main body control unit is stopped in the sleep mode, it is not necessary to develop a new optional device, and there is a cost merit in terms of development.

According to the first aspect of the present invention , the option interface device includes a signal transmission unit that transmits the return signal to the monitoring unit, and the main body control unit and the option after the main body control unit is activated by returning to the normal mode. a built-in interface unit for relaying communication data between devices, the optional interface device is connected to the main control unit, it is set to be connected with the optional device.

  According to this configuration, when the option interface device is connected to the option device, in the sleep mode, only the occurrence of the return factor from the option device is confirmed. I just need it. In the normal mode, it is only necessary to have a relay function for communication between the main body control unit and the optional device. Therefore, the power consumption of the option interface device can be kept small compared to the main body control unit. Thus, even when power is supplied to the option interface device during the sleep mode, the power saving effect is higher than when the main body control unit is kept driven even in the sleep mode. .

According to a second aspect of the present invention, in the first aspect of the invention, the monitoring unit is connected by a signal line to a detection unit that detects that an operation has been performed on the image forming apparatus, and an input unit that receives an input. When receiving either the signal indicating that the operation from the detection unit has been performed or the signal indicating that the input from the input unit has been received, it is determined that the return factor has occurred, and is issued from the optional device. The signal line for transmitting the return signal to the monitoring unit is OR-connected to the signal line between the detection unit or the input unit and the monitoring unit.

  According to this configuration, the signal line for transmitting the return signal from the optional device to the monitoring unit is OR-connected. Thereby, the configuration of the monitoring unit can be simplified, such as reducing the number of terminals, ports, and circuits for processing signals in the monitoring unit for receiving the return signal. Accordingly, the power consumption in the monitoring unit can be reduced, and the manufacturing cost of the monitoring unit is reduced.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the optional device is an authentication device that authenticates whether a billing device and / or an image forming device into which money is inserted may be used. It was decided.

  According to this configuration, even when an accounting device called a coin vendor or an authentication device that performs authentication using an IC card or a magnetic card is connected to the image forming apparatus as an optional device, the main body control unit is driven in the sleep mode. Therefore, a high power saving effect can be obtained.

According to a fourth aspect of the present invention, in the first to third aspects of the present invention, when a predetermined time has elapsed from the end of printing performed immediately before and / or an input for instructing the input unit to enter a sleep mode. In the case where the power supply is performed, the power supply unit shifts to the sleep mode.

  According to this configuration, transition from the normal mode to the sleep mode is performed, and power consumption in the standby state of the image forming apparatus is reduced.

  According to the present invention, by providing the monitoring unit, power supply to the main body control unit can be stopped in the sleep mode, and power consumption can be reduced. In addition, the monitoring unit does not relay data communicated between the optional device and the main unit control unit, and can receive only the return signal from the optional device for simplification. Does not occur.

FIG. 3 is an explanatory diagram illustrating an example of a connection between an optional device according to the first embodiment and a copying machine main body. 1 is a schematic cross-sectional view showing a schematic configuration of a copying machine according to a first embodiment. 2 is an enlarged schematic cross-sectional view of an image forming unit according to the first embodiment. FIG. 1 is a block diagram illustrating an example of a hardware configuration of a copier according to a first embodiment. FIG. 3 is a block diagram illustrating an example of a configuration related to power control in the copier according to the first embodiment. 5 is a flowchart illustrating an example of state transition control between a normal mode and a sleep mode in the copier according to the first embodiment. FIG. 6 is a block diagram illustrating an example of a configuration related to power control in a copying machine according to a second embodiment. FIG. 10 is a block diagram illustrating an example of a configuration related to power control in a copying machine according to a third embodiment. FIG. 10 is a block diagram illustrating an example of a configuration related to power control in a copying machine according to a fourth embodiment.

  A first embodiment of the present invention will be described below with reference to FIGS. In this embodiment, an electrophotographic tandem color copying machine 100 (corresponding to an image forming apparatus) will be described as an example. The copier 100 has a normal mode and a sleep mode that consumes less power than the normal mode. However, each element such as configuration and arrangement described in the present embodiment is merely an illustrative example without limiting the scope of the invention.

(Example of image forming device and optional device)
First, FIG. 1 shows an example of the connection between the optional device according to the first embodiment of the present invention and the main body of the copying machine 100. As shown in FIG. 1, a charging device 7A as an optional device is connected to the copying machine 100 using a cable CB. The charging device 7A is also called a coin vendor. A combination of the copying machine 100 and the charging device 7A is installed in, for example, a convenience store, a library, a shopping center, or the like.

  The charging device 7A is provided with, for example, a money insertion slot 71, a display unit 72 for displaying the balance, a return button 73 for returning the balance to the return slot 74 when pressed after the copy is completed. A person who wants to use the copying machine 100 puts money into the charging device 7A. Then, the fact that money has been inserted from the charging device 7A is transmitted from the charging device 7A to the copying machine 100, and the copying machine 100 is in a usable (printable) state. Each time printing is performed, the display unit 72 of the charging apparatus 7A reduces the balance display (for example, 20 yen for black and white A3 copy, 10 yen for black and white A4 copy, etc.). Then, when the return button 73 is pressed or the balance becomes 0 yen, the charging device 7A cannot use the copying machine 100.

(Schematic configuration of image forming apparatus)
First, the outline of the copying machine 100 according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a schematic cross-sectional view showing a schematic configuration of the copying machine 100 according to the first embodiment of the present invention. FIG. 3 is an enlarged schematic cross-sectional view of the image forming unit 2c according to the first embodiment of the present invention.

  As shown in FIG. 2, the copying machine 100 according to the present embodiment is provided with an operation panel 10 (shown by a broken line in FIG. 2 and corresponding to an input unit) at an upper front portion. A document cover 11 is provided at the top, and an image reading unit 12 (scanner) is provided below the document cover 11. In the main body, a paper feed unit 2a, a conveyance path 2b, an image forming unit 2c, an intermediate transfer unit 3a (corresponding to a transfer unit), a fixing unit 3b, and the like are provided.

  In order to facilitate maintenance such as removal of paper when a jam (paper jam) occurs, a side cover 13 that can be opened and closed is provided on the left side surface of the copying machine 100 main body to expose the conveyance path 2b and the like. And sensor S1 which detects opening and closing of the side cover 13 is provided. The sensor S <b> 1 only needs to be able to detect opening and closing of the side cover 13. For example, an interlock switch that contacts a part of the upper end of the side cover 13 is used. In the copying machine 100 of the present embodiment, the front cover 14 can also be opened and closed in order to replace the toner container (see FIG. 1). A sensor S2 for detecting opening / closing of the front cover 14 is also provided (see FIG. 3).

  The operation panel 10 is provided at the upper front of the copying machine 100. The operation panel 10 includes a touch panel type liquid crystal display unit 15. The liquid crystal display unit 15 can display the state of the copying machine 100 (for example, error occurrence and mode) and a setting screen. In addition, the operation panel 10 grasps the pressed position by the touch panel and accepts various inputs from the user. The operation panel 10 also includes a numeric keypad 16 for inputting numbers, a start key 17 for instructing the start of work such as copying, and a power saving key 18 for instructing transition to a sleep mode.

  The document cover 11 can be lifted with a fulcrum provided on the back side in FIG. The user lifts the document cover 11 and places the document on the contact glass 12 a on the upper surface of the image reading unit 12. The image reading unit 12 reads a document and generates image data. In the image reading section 12, an optical system member (not shown) such as an exposure lamp, a mirror, a lens, and an image sensor (for example, CCD) is provided. Using these optical members, the document is irradiated with light, and the output value of each pixel of the image sensor that receives the reflected light of the document is A / D converted to generate image data. The copying machine 100 can print based on the image data obtained by reading (copy function).

  Next, a detachable cassette 21 is provided in the paper feed unit 2a. Each cassette 21 (in FIG. 2, the upper one is denoted by 21a and the lower one is denoted by 21b) is a sheet of various sizes (copy paper, label paper, etc.) and each size (A size, B size paper, etc.). Can accommodate multiple sheets. A paper feed roller 22 of the paper feed unit 2a (in FIG. 2, the upper one is denoted by 22a and the lower one is denoted by 22b) is rotated by a drive mechanism (not shown) such as a motor to convey the paper. Send to 2b.

  Note that the copying machine 100 of the present embodiment is provided with sensors S3 and S4 for detecting attachment / detachment of each cassette 21. For example, the sensors S3 and S4 are switches that are in contact with the side wall on the back side (rear side of the copying machine 100) of the cassette 21, and the ON / OFF state changes depending on whether the cassette 21 is attached or pulled out. The sensors S3 and S4 are not limited to switch-type sensors such as optical sensors, and may be any sensor that can detect the attachment / detachment of each cassette 21.

  The transport path 2 b is a path for transporting the paper supplied from the paper feed unit 2 a to the discharge tray 23. The transport path 2b is provided with a plurality of transport roller pairs 24 that are driven to rotate and transport the paper during printing. In addition, the conveyance path 2b is provided with a pair of registration rollers 25 and the like for waiting the sheet in front of the intermediate transfer unit 3a and feeding the sheet in time.

  Further, the copying machine 100 has an image forming unit 2c including an image forming unit 20 for four colors and an exposure device 26 as a part for forming a toner image based on image data of an image to be formed. Further, the copying machine 100 includes an intermediate transfer unit 3a as a part for transferring a toner image onto a sheet. First, from the left in FIG. 2, an image forming unit 20Bk (black), an image forming unit 20C (cyan), an image forming unit 20M (magenta), and an image forming unit 20Y (yellow) are arranged in the image forming unit 2c. Is done. One exposure device 26 is disposed below the exposure device 26.

  Here, the image forming units 20Bk to 20Y will be described with reference to FIG. Each of the image forming units 20Bk to 20Y has basically the same configuration except that the color of the toner image to be formed is different. Therefore, only one image forming unit 20 is shown in FIG. 3, and in the following description, unless otherwise specified, Bk (black), Y (yellow), C (cyan), M, which are color identification codes, are shown. The sign of (magenta) is omitted.

  First, each photosensitive drum 27 provided in each image forming unit 20 has a photosensitive layer such as amorphous silicon, and carries a toner image on its peripheral surface. Each photoconductor drum 27 is driven to rotate counterclockwise at a predetermined speed by a driving device (not shown). Each charging device 28 charges the photosensitive drum 27 at a constant potential.

  The exposure device 26 below each image forming unit 2c (see FIG. 2) converts the input color-separated image signal into an optical signal by a laser output unit (not shown), and the converted optical signal. Can be output for four colors. Then, the exposure device 26 performs scanning exposure of each charged photosensitive drum 27 to form an electrostatic latent image.

  Each developing device 29 has a developing roller 29a carrying toner (black in the image forming unit 20Bk, yellow in the image forming unit 20Y, cyan in the image forming unit 20C, and magenta in the image forming unit 20M). ). Each developing roller 29a faces each photoconductor drum 27 and supplies toner. Each cleaning device 29b cleans and removes transfer residual toner and the like on the surface of the photosensitive drum 27.

  Returning to FIG. The intermediate transfer unit 3a receives the primary transfer of the toner image on each photosensitive drum 27, and performs secondary transfer onto the paper. The intermediate transfer unit 3a includes one primary transfer roller 31 (a total of four rollers 31Bk to 31Y) provided for each photosensitive drum 27, an intermediate transfer belt 32, a drive roller 33, driven rollers 34 and 35, and a secondary transfer. It comprises a roller 36, a belt cleaning device 37, and the like. Each primary transfer roller 31 sandwiches each photosensitive drum 27 and an endless intermediate transfer belt 32, and a predetermined voltage is applied during primary transfer. The intermediate transfer belt 32 is stretched around each roller and rotates in the clockwise direction in FIG. The secondary transfer roller 36 sandwiches the intermediate transfer belt 32 with the driving roller 33.

  The toner images of the respective colors formed by the image forming unit 20 are superimposed with no timing and sequentially transferred, and are primarily transferred to the intermediate transfer belt 32. The superimposed toner images are transferred to a sheet by a secondary transfer roller 36 to which a predetermined voltage is applied. The residual toner on the intermediate transfer belt 32 after the secondary transfer is removed and collected by the belt cleaning device 37.

  The fixing unit 3b heats and presses the toner image secondarily transferred onto the paper to fix it. The fixing unit 3b mainly includes a heating roller 38 incorporating a heater and a pressure roller 39 pressed against the heating roller 38. The sheet on which the toner image has been transferred passes through the nip between the heating roller 38 and the pressure roller 39 and is heated and pressurized, and as a result, the toner image is fixed on the sheet. The fixed sheet is discharged to the discharge tray 23 and printing is completed.

(Hardware configuration of copying machine 100)
Next, based on FIG. 4, the hardware configuration of the copying machine 100 according to the embodiment of the present invention will be described. FIG. 4 is a block diagram showing an example of the hardware configuration of the copying machine 100 according to the embodiment of the present invention.

  As shown in FIG. 4, the copier 100 according to the present embodiment has a main body control unit 5 configured by combining an internal control board, various elements, circuits, and the like. The main body control unit 5 controls each part of the copying machine 100 and is provided in the main body. The main body control unit 5 is connected to the image forming mechanism 1 for transporting paper and forming (printing) an image, and controls the operation of the image forming mechanism 1 to control the image forming apparatus. The image forming mechanism 1 includes, for example, an image reading unit 12, a paper feeding unit 2a, a conveyance path 2b, an image forming unit 2c, an intermediate transfer unit 3a, a fixing unit 3b, and the like. That is, the copying machine 100 is provided with an image forming mechanism 1 for conveying paper and forming an image. An operation panel 10 is connected to the main body control unit 5, and contents inputted by pressing various keys such as the liquid crystal display unit 15 and the power saving key 18 are transmitted to the main body control unit 5. Then, the main body control unit 5 controls the copying machine 100 so as to meet the user's intention.

  The main body control unit 5 is connected to the monitoring unit 6 so as to be communicable. The monitoring unit 6 monitors whether a return factor for returning the copier 100 from the sleep mode to the normal mode has occurred. Therefore, the monitoring unit 6 is connected to the sensors S1 to S4 and the operation panel 10. The monitoring unit 6 is also connected to a power supply unit 4 that switches power to be supplied in the sleep mode and the normal mode.

  Furthermore, when receiving image data to be printed from the external computer 300 or a request for transmitting various data such as maintenance data from the external computer 300, the copying machine 100 returns from the sleep mode to the normal mode. Therefore, the monitoring unit 6 is connected to a network 200 connected to an external computer 300 (for example, a server or a personal computer). For example, the monitoring unit 6 confirms the MAC address (Media Access Control address) of the data flowing through the network 200 and selects whether the data is addressed to the own device. Note that the computer 300 and the monitoring unit 6 can be connected by a cable to directly communicate with the computer 300.

  Data received from the external computer 300 is transmitted from the monitoring unit 6 to the main body control unit 5. When data is transmitted from the copying machine 100 to the external computer 300, for example, the monitoring unit 6 serves as a relay point for data transmission from the main body control unit 5 to the external computer 300. Thus, the monitoring unit 6 also has a function as a communication interface.

(Normal mode and Sleep mode)
Next, a normal mode and a sleep mode in the copying machine 100 according to the first embodiment of the present invention will be described with reference to FIG. FIG. 5 is a block diagram showing an example of a configuration related to power control in the copying machine 100 according to the first embodiment of the present invention.

  The copier 100 of the present embodiment has a normal mode that keeps the copier 100 in a printable state. In the normal mode, the power supply unit 4 supplies power to the main body control unit 5 that controls the copying machine 100, the image forming mechanism 1, the monitoring unit 6 as a communication interface, and the like. In FIG. 5, the direction of supplied power is indicated by white arrows.

  The power supply unit 4 is connected to a commercial power source, for example. In the power supply unit 4, a plurality of circuits and elements (not shown) such as a rectifier circuit, a step-up transformer, and a DC / DC converter are arranged to generate various voltages. For example, a voltage for driving a motor (for example, DC 24 V) for rotating various rotating bodies such as the photosensitive drum 27 and a DC voltage (for example, 5 V, 3.3 V, etc.) for the main body control unit 5 and the monitoring unit 6 are used. And so on.

  For example, in the normal mode, the main body control unit 5 performs control such as turning on / off the heater of the fixing unit 3b to keep the fixing unit 3b at a fixable temperature. However, even in a standby state where printing is not performed in the normal mode, a certain amount of power is consumed by the image forming mechanism 1, the main body control unit 5, and the like.

  However, from the viewpoint of energy saving, not only the instantaneous maximum power consumption but also the magnitude of the power consumption in the standby state is becoming a point for consideration when the consumer selects the copier 100. Therefore, the copying machine 100 according to the present embodiment has a fixed time (for example, several minutes to several tens of minutes from the completion of printing. For example, the time measuring unit 58 measures time), when no operation or input is performed on the copying machine 100, or a power saving key. For example, when 18 is pressed, the mode is changed from the normal mode to the sleep mode.

  In the sleep mode, the copying machine 100 according to the present embodiment stops supplying power to the main body control unit 5 and the image forming mechanism 1. Thereby, power consumption in the standby state of the copying machine 100 is reduced. That is, the power supply unit 4 supplies power to the image forming mechanism 1 and the main body control unit 5 in the normal mode, and does not supply power to the image forming mechanism 1 and the main body control unit 5 in the sleep mode. Supply. As described above, in the copying machine 100, the power supply destination, the generated voltage, the current capacity, and the like in the normal mode and the sleep mode are different. Therefore, a power saving power control unit 41 and a normal power control unit 42 are provided in the power supply unit 4. The power saving power control unit 41 operates in the sleep mode, and the normal power control unit 42 operates in the normal mode. Each power control unit controls operations of circuits and elements in the power supply unit 4 and controls voltage generation and power supply in each mode.

(Return from sleep mode)
Next, an example of return from the sleep mode in the copying machine 100 according to the embodiment of the present invention will be described with reference to FIG.

  First, in the main body control unit 5 of the copier 100 of the present embodiment, a CPU 51 as a central processing unit, data for performing control, ROM 52 for storing programs, data, programs, image data, etc. are temporarily stored. A RAM 53 to be stored and an image processing unit 54 for performing image processing on the image data are provided.

  Further, for example, the main body control unit 5 has an interface unit 55 for communicating data with the monitoring unit 6 (hereinafter, the term “interface unit” is abbreviated as “I / F unit”. The same applies to the figure). It has an I / F unit 56 for data communication with the accounting device 7A. Further, an I / F unit 57 for performing communication and signal exchange with each component in the image forming mechanism 1 can be provided for printing control such as motor rotation and voltage application timing. The time measuring unit 58 is a part that performs time required for control, for example, a predetermined time has passed without any operation or input to the copying machine for shifting from the normal mode to the sleep mode.

  For example, the main body control unit 5 gives the power supply unit 4 an instruction to shift from the normal mode to the sleep mode. Upon receiving this instruction, the normal power control unit 42 stops the power supply control, and the power saving power control unit 41 performs the power supply control. As a result, the power supply to the monitoring unit 6 and the power supply to the main body control unit 5 and the image forming mechanism 1 are stopped, and the mode shifts to the sleep mode.

  Here, the configuration of the accounting apparatus 7A will be described. The accounting device 7A is provided with a CPU 7a, ROM 7b, and RAM 7c as a central processing unit for controlling the operation of the accounting device 7A. The ROM 7b stores data and programs for controlling the accounting device 7A. In the RAM 7c, data and programs necessary for controlling the accounting apparatus 7A are expanded.

  The mechanism unit 7d in the charging device 7A includes an insertion slot 71 and a return button 73. When the money is inserted, the amount of the inserted money is grasped, and when the return button 73 is pressed, the money return slot 74 is returned. This is a part related to mechanical mechanisms such as For example, the mechanism unit 7d transmits data indicating the amount of money inserted to the CPU 7a. Thereby, the amount of money inserted is stored in the RAM 7c or the memory in the CPU 7a.

  Each time the user prints with the copying machine 100, the amount is subtracted and the balance is grasped. For example, the display unit 72 displays the amount of money input and the amount of remaining money. Further, for example, a display for guiding the user that a specific operation of inserting money should be performed in order to return the copying machine 100 from the sleep mode to the normal mode such as “please insert money”. May be done. Note that the same guidance display may be performed on the operation panel 10.

  Further, since the charging device 7A performs data communication with the main body control unit 5, the I / F unit 7e in the charging device 7A is connected to the I / F unit 56 of the main body control unit 5. For example, when printing is performed by the copying machine 100, the I / F unit 7e receives from the main body control unit 5 side data indicating the type of black and white copy and color copy, and the printing contents such as used paper. Then, for example, the CPU 7a subtracts the amount according to the print content and switches the balance display. In addition, for example, the I / F unit 7e receives data from the CPU 7a and the like, and directs data indicating executable print contents to the I / F unit 56 of the main body control unit 5 in consideration of the amount of money and the balance remaining. You may send it. For example, if the balance is 10 yen, data indicating that only monochrome copying of paper smaller than A3 can be executed is transmitted from the I / F unit 7e to the main body control unit 5. The print content that can be executed in consideration of the input amount and the balance may be managed on the main body control unit 5 side.

  The power supply device 7f of the charging device 7A is connected to, for example, a commercial power supply, and generates a supply voltage for each component in the charging device 7A. For example, the power supply device 7f also generates a voltage to be supplied to the motor and various sensors in the mechanism unit 7d. Note that the power of the accounting apparatus 7A may be supplied from the copying machine 100.

  The I / O unit 7g indicates that a factor (return factor) that causes the copying machine 100 to return from the sleep mode to the normal mode due to money being inserted when the copying machine 100 is in the sleep mode ( A return signal) is sent to the return factor monitoring unit 66 of the monitoring unit 6. In other words, the copying machine 100 is an optional device for determining whether the image forming apparatus can be used, and transmits an I / O signal indicating to the monitoring unit 6 that a return factor has occurred as a result of the operation. A charging device 7A including an O unit 7g (corresponding to a signal transmission unit) and an I / F unit 7e that communicates with the main body control unit 5 after the main body control unit 5 is activated by returning to the normal mode.

  Next, regarding the monitoring unit 6, the monitoring unit 6 includes a CPU 61 as a central processing unit, a ROM 62 that stores programs and data for the monitoring unit 6, and programs and data used to control the monitoring unit 6. In addition, a RAM 63 that temporarily stores data received from the network 200 is provided.

  The I / F unit 64 of the monitoring unit 6 is connected to the I / F unit 55 of the main body control unit 5. The monitoring unit 6 is provided with an I / F unit 65 that is connected to the network 200 and receives various data such as image data from the outside addressed to the own device. The return factor monitoring unit 66 receives signals from sensors S1 to S4 (corresponding to a detection unit) that detect attachment / detachment of each cassette 21 and opening / closing of each cover. The return factor monitoring unit 66 detects that the copying machine 100 has been operated by opening / closing each cover or attaching / detaching each cassette 21 based on a change in the state of the signal line SL that transmits a return signal from each sensor. .

  Further, the return factor monitoring unit 66 is supplied with a return signal from the operation panel 10 that informs the operation panel 10 (corresponding to the input unit) that the liquid crystal display unit 15 or various keys have been pressed. Further, an OR circuit 67 is provided in the middle of the signal line SL from the operation panel 10 to the return factor monitoring unit 66, for example. The output terminal of the OR circuit 67 is connected to the return factor monitoring unit 66. One input terminal of the OR circuit 67 is connected to the operation panel 10. The other input terminal of the OR circuit 67 is connected to the I / O unit 7g in the charging device 7A. The I / O unit 7g in the charging device 7A issues a return signal when money is inserted into the charging device 7A. The OR circuit 67 may be provided between the signal lines SL between the sensors and the recovery factor monitoring unit 66.

  The monitoring unit 6 receives a return signal from each sensor or a return signal (output of the OR circuit 67) from the operation panel 10 or the I / O unit 7g of the charging apparatus 7A to the return factor monitoring unit 66. A return factor is generated, and it is determined that the normal mode should be returned from the sleep mode. That is, the monitoring unit 6 is connected to each sensor (detection unit) that detects that an operation has been performed on the copying machine 100 and the operation panel 10 (input unit) that receives an input through the signal line SL. When either a signal indicating that an operation has been performed or a signal indicating that an input from the input unit has been received, it is determined that a return factor has occurred. A signal line SL that transmits a return signal from the optional device to the monitoring unit 6 is OR-connected to the signal line SL between each sensor or operation panel 10 and the monitoring unit 6. The I / F unit 65 monitors data flowing through the network 200 and receives data addressed to itself. Then, when the I / F unit 65 receives the data addressed to itself, the monitoring unit 6 determines that a return factor is generated and the normal mode should be returned from the sleep mode.

  When determining that the sleep mode should return to the normal mode, the monitoring unit 6 instructs the power supply unit 4 to switch from the control by the power saving power control unit 41 to the control by the normal power control unit 42. That is, the monitoring unit 6 monitors whether or not a factor for returning from the sleep mode to the normal mode has occurred, and when determining that the factor for returning has occurred, gives an instruction to the power supply unit 4 to supply power in the normal mode. As a result, power supply to the image forming mechanism 1 and the main body control unit 5 is started, and the main body control unit 5 is activated. After the activation, for example, the main body control unit 5 communicates with the charging device 7A and grasps the amount of money and the contents that can be printed.

  Here, if power is supplied to the main body control unit 5, power is also supplied to each component in the main body control unit 5 such as the CPU 51. As described above, the main body control unit 5 is provided with many elements and circuits in order to perform various controls. For example, the CPU 51, the RAM 53, and the image processing unit 54 that operate at high speed are used, and the elements that operate at high speed generally consume more power than those at low speed. Further, since the I / F unit 57 and the like can handle a large amount of data such as image data, the I / F unit 57 and the like can be high speed and high power consumption.

  Then, if power is supplied to the main body control unit 5 even when printing is not being performed (standby state), constant power is consumed. On the other hand, conventionally, in order for the main body control unit 5 to recognize that a return factor has occurred due to money being inserted into the charging device 7A, it is necessary to always communicate between the main body control unit 5 and the charging device 7A. Yes, the power supply to the main body control unit 5 could not be stopped.

  Thus, in the present embodiment, the monitoring unit 6 collectively grasps that any of a plurality of types of return factors has occurred. The monitoring unit 6 only needs to detect the occurrence of a return factor in addition to the function as a network interface, and the function is limited as compared with the main body control unit 5. Therefore, power consumption is less than that of the main body control unit 5. For example, the main body control unit 5 consumes about 5 to several tens of watts even in the standby state. On the other hand, the monitoring unit 6 basically only needs to check the data flowing through the network 200 and the presence or absence of a return signal from a sensor or the like, and power consumption is less than 5 W (for example, about 1 to 2 W). Therefore, if the power supply to the main body control unit 5 is stopped in the sleep mode, a high power saving effect can be obtained.

  In addition, the return factor monitoring unit 66 of the monitoring unit 6 notifies the return signal (for example, if a return factor occurs) from each sensor, the operation panel 10, or the I / O unit 7g of the charging device 7A. , Low → High, and a signal that changes from High → Low). For example, transmission / reception of each data performed between the accounting device 7 </ b> A and the main body control unit 5 does not pass through the monitoring unit 6.

(Transition control between normal mode and sleep mode)
Next, an example of state transition control between the normal mode and the sleep mode in the copying machine 100 according to the first embodiment of the present invention will be described with reference to FIG. FIG. 6 is a flowchart illustrating an example of state transition control between the normal mode and the sleep mode in the copying machine 100 according to the first embodiment of the present invention.

  First, the start shown in FIG. 5 is, for example, when the main power of the copying machine 100 and the accounting apparatus 7A is turned on in the present invention. After the main power supply is turned on, the normal power control unit 42 of the power supply unit 4 starts operating (step # 1), power is supplied to the main body control unit 5 and the image forming mechanism 1, and the normal mode is set (step # 2). ). After warm-up, copying machine 100 is maintained in a printable state (step # 3). Next, the main body control unit 5 confirms whether or not a predetermined time has elapsed since the power-saving key is pressed on the operation panel 10 and the operation or input to the copier 100 has been lost, and confirms whether or not to shift to the sleep mode. (Step # 4).

  If not yet shifted to the sleep mode (No in step # 4), for example, the process returns to step # 2. On the other hand, if shifting to the sleep mode (Yes in step # 4), the main body control unit 5 instructs the power supply unit 4 to shift to the sleep mode mode (step # 5). As a result, in the power supply unit 4, power supply control is performed by the power saving power control unit 41, power supply to the main body control unit 5 and the image forming mechanism 1 is stopped (step # 6), and the copying machine 100 is The sleep mode is entered (step # 7). In the sleep mode, the monitoring unit 6 confirms whether a factor for returning from the sleep mode to the normal mode has occurred (step # 8).

  Then, the monitoring unit 6 confirms whether or not it is necessary to return to the normal mode because a return factor has occurred (step # 9). If it is not necessary to return to the normal mode (No in Step # 9), for example, the process returns to Step # 6. On the other hand, if it is necessary to return to the normal mode (Yes in step # 9), the monitoring unit 6 instructs the power supply unit 4 to switch to the control by the normal power control unit 42 (step # 10). Thereafter, for example, the process returns to step # 1.

(Second Embodiment)
Next, an example of a configuration related to power control in the copying machine 100 according to the second embodiment of the present invention will be described with reference to FIG. FIG. 7 is a block diagram showing an example of a configuration related to power control in the copying machine 100 according to the second embodiment of the present invention.

  In the first embodiment, the copying machine 100 including the charging device 7A as an optional device has been described. Similarly to the accounting device 7A, the authentication device 8A is an optional device that always communicates with the main body control unit 5 in the sleep mode. This embodiment is different in that an authentication device 8A is connected to the copying machine 100 instead of the charging device 7A. In other respects, the second embodiment may be the same as the first embodiment (a common part is denoted by the same reference numeral as the first embodiment. The same applies hereinafter). Therefore, in the following, differences from the first embodiment will be referred to, and common portions will not be described unless specifically described. In this description, the authentication apparatus 8A will be described as receiving power from the main body of the copying machine 100.

  First, the authentication device 8A authenticates whether the image forming apparatus can be used. It can also be used to grasp the usage status of the copying machine 100 by the user, such as the number of sheets printed by the copying machine 100. The authentication device 8A is provided with an authentication mechanism unit 81 for acquiring information in order to authenticate whether the user has authority to use. For example, when reading a magnetic card or an IC card for authentication as to whether or not the user has authority to use, the authentication mechanism unit 81 becomes a card reader / writer device. In the case of performing biometric authentication, the scanning apparatus reads biometric information (for example, fingerprints). Further, when the authentication device 8A is a key counter (counter that counts the number of copies), a legitimate key counter detects attachment and serves as a mechanism for moving the scale of the key counter for each printed sheet.

  A CPU 8a as a central processing unit is also provided in the authentication device 8A. The ROM 8b in the authentication device 8A stores verification data in addition to a program and data for controlling the authentication device 8A. The ROM 8b can also store the usage status such as the number of copies, the number of times, and the usage time of each user. The RAM 8c develops programs and various data. For example, when the authentication device 8A reads a magnetic card, an IC card, or biometric information, the CPU 8a may hold the information read from the card in the RAM 8c, compare it with the verification data in the ROM 8b, and allow the use. Or authenticate. When the authentication device 8A is a key counter, verification and authentication are not necessary.

  If the authentication device 8A authenticates that the user has authority to use, a return signal is transmitted from the I / O unit 8d of the authentication device 8A to the return factor monitoring unit 66 of the monitoring unit 6. Upon receiving this return signal, the monitoring unit 6 returns from the sleep mode to the normal mode. After returning from the normal mode, data for specifying the user between the I / F unit 56 of the main body control unit 5 and the I / F unit 8e of the authentication device 8A, and necessary data such as the contents of printing performed are stored. Communication takes place. In other words, the copying machine 100 is an optional device for determining whether the image forming apparatus can be used, and transmits an I / O signal indicating to the monitoring unit 6 that a return factor has occurred as a result of the operation. An authentication unit 8A including an O unit 8d (corresponding to a signal transmission unit) and an I / F unit 8e that communicates with the main body control unit 5 after the main body control unit 5 is activated by returning to the normal mode.

  In this way, according to the configuration of the first and second embodiments, the monitoring unit 6 that monitors whether the cause of return from the sleep mode to the normal mode has occurred is provided, and an optional device (for example, the charging device 7A, The authentication device 8A) is operated, and a return signal indicating that a return factor has occurred is transmitted from the optional device to the monitoring unit 6. As a result, the image forming device returns from the sleep mode to the normal mode. Accordingly, in the sleep mode, it is not necessary to drive the main body control unit 5 as well as the image forming mechanism 1. Here, the monitoring unit 6 mainly has a function of monitoring the occurrence of a return factor from the sleep mode to the normal mode. Since the function performed by the monitoring unit 6 is smaller than that of the main body control unit 5, the power consumption is smaller than that of the main body control unit 5. I'll do it. Therefore, in the sleep mode, the power supply (standby power) in the sleep mode can be reduced by supplying power to the monitoring unit 6 without driving the main body control unit 5. Therefore, even if the optional device is attached, the image forming apparatus has a high power saving effect.

  Further, only the return signal is transmitted to the monitoring unit 6, and the content (data) to be communicated between the main body control unit 5 and the optional device does not pass through the monitoring unit, and after the main body control unit 5 is started, the main body control Exchanged between the unit 5 and the optional device. As a result, the monitoring unit 6 does not need a configuration of a controller, a chip, a buffer, or the like for relaying data communication between the optional device and the main body control unit 5, and the configuration of the monitoring unit 6 can be simplified. . Therefore, the power consumption in the monitoring unit 6 can be reduced, and the power consumption of the monitoring unit 6 in the sleep mode can be reduced. Further, since the configuration of the monitoring unit 6 is simplified, the manufacturing cost of the monitoring unit 6 is reduced.

  The signal line SL for transmitting the return signal from the optional device to the monitoring unit 6 is OR-connected. Thereby, the configuration of the monitoring unit 6 can be simplified, such as reducing the number of terminals, ports, and circuits for processing signals in the monitoring unit 6 for receiving the return signal. Even when a charging device 7A called a coin vendor or an authentication device 8A that performs authentication using an IC card or a magnetic card is connected to the image forming apparatus as an optional device, the main body control unit 5 is driven in the sleep mode. There is no need, and a high power saving effect can be obtained.

(Third embodiment)
Next, an example of a configuration relating to power control in the copying machine 100 according to the third embodiment of the present invention will be described with reference to FIG. FIG. 8 is a block diagram showing an example of a configuration related to power control in the copying machine 100 according to the third embodiment of the present invention.

  In the third embodiment, even when an existing charging device 7B that communicates with the main body control unit 5 is always attached to the copying machine 100 even in the sleep mode, the power supply to the main body control unit 5 can be stopped in the sleep mode. The difference is that an optional interface device 9A is provided. In other respects, the third embodiment may be the same as the first embodiment. Therefore, in the following, points different from the first embodiment will be referred to, and common portions will be omitted except for the case where they are specifically described, and will be denoted by the same reference numerals as those in the first embodiment.

  In the first embodiment, only the return signal is transmitted from the I / O unit 7g of the charging apparatus 7A to the return factor monitoring unit 66 of the monitoring unit 6. The exchange of data such as balance information between the charging device 7A and the main body control unit 5 is performed after the main body control unit 5 is activated after returning to the normal mode. However, in order to exchange such signals and data, the billing apparatus must have a corresponding configuration and interface (I / F unit 7e, I / O unit 7g).

  Here, the charging device 7B of FIG. 8 is a conventional one and does not have, for example, the I / O unit 7g. The I / F unit 7h in the charging apparatus 7B is originally connected to the I / F unit 56 of the main body control unit 5. For example, data indicating that a return factor has occurred due to the operation of the accounting device 7B is input from the I / F unit 7h to the I / F unit 56 of the main body control unit 5. Thus, the existing charging device 7B that always communicates with the main body control unit 5 even in the sleep mode usually does not have a configuration that can transmit only the return signal to the return factor monitoring unit 66.

  Even in the existing charging device 7B, in order to stop the power supply to the main body control unit 5 in the sleep mode, it is conceivable that the I / F unit 7h is connected to the monitoring unit 6 (for example, the monitoring unit 6). In addition, an I / F unit for connecting to the I / F unit 7h is separately provided). If such a configuration is adopted, (direct communication is not performed between the main body control unit 5 and the charging device 7B, and communication between the charging device 7B and the main body control unit 5 such as the remaining amount information is performed in addition to the occurrence of a return factor. All of the contents to be relayed are relayed to the monitoring unit 6. Then, the configuration of the monitoring unit 6 becomes complicated, and if the configuration of the monitoring unit 6 becomes complicated, the power consumption of the monitoring unit 6 increases accordingly. This increases the manufacturing cost.

  Even if the monitoring unit 6 is newly provided with an I / F unit, it is used only when the charging device 7B is attached, and it is to be avoided to provide a standard one that is not necessarily used. Therefore, in this embodiment, the I / F unit 7h is not directly connected to the monitoring unit 6, but the option interface device 9A is installed simultaneously with the installation of the accounting device 7A.

  The option interface device 9A relays the transmission of a return signal from the charging device 7B to the monitoring unit 6 and the exchange of data between the charging device 7B and the main body control unit 5. That is, the copying machine 100 is an optional device for determining whether or not the copying machine 100 can be used, and transmits to the main body control unit 5 data indicating that a return factor has occurred due to the operation. The charging device 7B that transmits the data to be transmitted and the monitoring unit 6 are provided with an option interface device 9A that transmits only a return signal indicating that a return factor has occurred and relays communication between the main body control unit 5 and the option device. .

  The option interface device 9A includes a CPU 9a as a central processing unit that performs relay control and the like. The option interface device 9A also includes a ROM 9b for storing relay control programs and data, relay control programs and data, data to be exchanged between the charging device 7A and the main body control unit 5 (remaining amount information, etc.), etc. A RAM 9c is provided for temporarily developing and storing various programs and data.

  The option interface device 9A includes an I / F unit 9d connected to the I / F unit 7h of the charging device 7B and an I / F unit 9e connected to the I / F unit 56 of the main body control unit 5. Further, the option interface device 9A is also provided with an I / O unit 9f that transmits a return signal to the return factor monitoring unit 66. That is, the option interface device 9A includes an I / O unit 9f (corresponding to a signal transmission unit) that transmits a return signal to the monitoring unit 6, and the main body control unit 5 after the main body control unit 5 is activated by returning to the normal mode. The I / F units 9d and 9e for relaying data communication between the option devices are built in, and the option interface device 9A is connected to the main body control unit 5 and also to the charging device 7B.

  The option interface device 9A grasps and recognizes data received from the I / F unit 9d, which is transmitted from the I / F unit 7h that money has been thrown into the charging device 7B in the sleep mode and that a return factor has occurred. At this time, for example, the CPU 9a of the option interface device 9A transmits a return signal from the I / O unit 9f to the return factor monitoring unit 66. In other words, the option interface device 9A selects only the data indicating the occurrence of the return factor from the data received from the I / F unit 7h and transmits it to the return factor monitoring unit 66.

  On the other hand, after the main body control unit 5 starts driving the data other than the data indicating that the return factor has occurred (for example, data indicating the amount of money to be inserted) by the return from the sleep mode, the option interface device 9A The data is transmitted from the / F unit 9e to the I / F unit 56 of the main body control unit 5. The transmission of data from the main body control unit 5 to the charging device 7B is received by the I / F unit 9e from the I / F unit 56 and transferred from the I / F unit 9d to the I / F unit 7h. That is, the option interface device 9A relays data transmitted and received between the main body control unit 5 and the charging device 7B.

(Fourth embodiment)
Next, an example of a configuration related to power control in the copying machine 100 according to the fourth embodiment of the present invention will be described with reference to FIG. FIG. 9 is a block diagram showing an example of a configuration related to power control in the copying machine 100 according to the fourth embodiment of the present invention.

  The fourth embodiment is different from the above-described embodiment in that an existing authentication device 8B is connected to the copying machine 100 as an optional device. In addition, about the other point, 4th Embodiment may be the same as that of the above-mentioned embodiment. Therefore, in the following, points different from the above-described embodiment will be referred to, and common portions will be omitted from description unless otherwise described, and will be denoted by the same reference numerals as those in the above-described embodiment.

  In the same manner as described in the third embodiment, only the return signal is transmitted to the return factor monitoring unit 66 and data is exchanged after the main body control unit 5 is started. The I / O unit 8d of the apparatus 8A must be provided. Here, the authentication device 8B of the present embodiment shown in FIG. 9 is a conventional one. The I / F unit 8f in the authentication device 8B is originally connected to the I / F unit 56 of the main body control unit 5. As described above, the authentication device 8B that always communicates with the main body control unit 5 even in the sleep mode does not have a configuration for transmitting only the return signal to the return factor monitoring unit 66. However, if the I / F unit 8f of the authentication device 8B and the return factor monitoring unit 66 are directly connected, the configuration of the monitoring unit 6 becomes complicated as in the third embodiment.

  Therefore, in the present embodiment, the option interface device 9B is installed simultaneously with the installation of the authentication device 8B, as in the third embodiment. The option interface device 9B transmits the return signal to the authentication device 8B and the monitoring unit 6, for identifying the usage status of each user, such as data for specifying the user and printing contents with the main body control unit 5. Relay the exchange of data. That is, the copying machine 100 is an optional device for determining whether or not the copying machine 100 can be used, and transmits to the main body control unit 5 data indicating that a return factor has occurred due to the operation. The authentication apparatus 8B that transmits the data to be transmitted and the monitoring unit 6 are provided with an option interface device 9B that transmits only a return signal indicating that a return factor has occurred and relays communication between the main body control unit 5 and the option device. .

  The option interface device 9B has a CPU 9g as a central processing unit. The option interface device 9B also includes a ROM 9h for storing relay control programs and data, relay control programs and data, and data exchanged between the authentication device 8B and the main body control unit 5 (user information and number of printed sheets). A RAM 9i in which various programs and data are temporarily expanded and stored.

  The option interface device 9B includes an I / F unit 9j connected to the I / F unit 8f of the authentication device 8B and an I / F unit 9k connected to the I / F unit 56 of the main body control unit 5. Further, the option interface device 9B is also provided with an I / O unit 9m that transmits a return signal to the return factor monitoring unit 66. That is, the option interface device 9A includes an I / O unit 9m (corresponding to a signal transmission unit) that transmits a return signal to the monitoring unit 6, and the main body control unit 5 after the main body control unit 5 is activated by returning to the normal mode. The I / F units 9j and 9k for relaying data communication between the option devices are incorporated, and the option interface device 9B is connected to the main body control unit 5 and also to the authentication device 8B.

  The option interface device 9B recognizes that the return factor has occurred due to the fact that the authorization to use is obtained by grasping the data transmitted from the I / F unit 8f to the I / F unit 9j. it can. At this time, for example, the CPU 9g of the option interface device 9B transmits a return signal from the I / O unit 9m to the return factor monitoring unit 66.

  On the other hand, after the main body control unit 5 starts driving data other than data indicating that the return factor has occurred by returning from the sleep mode, the option interface device 9B starts from the I / F unit 9k to the main body control unit 5. Send to. Data transmission from the main body control unit 5 to the authentication device 8B is received by the I / F unit 9k from the I / F unit 56 and transferred from the I / F unit 9j to the I / F unit 8f. That is, the option interface device 9B relays data transmitted and received between the main body control unit 5 and the authentication device 8B.

  As described above, according to the configurations of the third and fourth embodiments, when the existing optional device (for example, the charging device 7B and the authentication device 8B) is attached, the main body control unit 5 normally performs the return factor. It is also driven in sleep mode to know that has occurred. On the other hand, the option interface devices 9A and 9B relay the exchange of signals and data between the option device and the image forming apparatus main body. Thereby, even if the existing optional device is attached, the power supply to the main body control unit 5 in the sleep mode can be stopped, and the power saving effect is high. In addition, the configuration of the monitoring unit 6 can be simplified. Further, the power supply of the main body control unit 5 can be stopped in the sleep mode while changing the existing optional device without changing the configuration. In addition, the customer can only add investment to install the optional interface devices 9A and 9B without purchasing a new optional device. Further, since the power supply to the main body control unit 5 is stopped in the sleep mode, it is not necessary to develop a new billing device or authentication device, and there is a cost advantage in terms of development.

  The option interface devices 9A and 9B are connected to the option device. In the sleep mode, only the occurrence of the return factor from the option device is confirmed. If the return factor does not occur, the function is transmitted to the monitoring unit 6. I just need it. In the normal mode, it is only necessary to perform communication relay between the main body control unit 5 and the option device, and the power consumption of each option interface device 9A, 9B can be kept smaller than that of the main body control unit 5. Thus, even when power is supplied to the option interface devices 9A and 9B during the sleep mode, the power saving effect is higher than when the main body control unit 5 is continuously driven in the sleep mode. .

  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 is applicable to an image forming apparatus provided with an optional device such as a charging device or an authentication device.

DESCRIPTION OF SYMBOLS 1 Image formation mechanism 4 Electric power supply part 5 Main body control part 6 Monitoring part 67 OR circuit 7A Charging apparatus (option apparatus)
7e I / F section (inside charging device 7A)
7g I / O unit (signal transmission unit, in the accounting device 7A)
7B Billing device (optional device) 8A Authentication device (optional device)
8d I / O unit (signal transmitter, in authentication device 8A)
8e I / F section (within authentication device 8A) 8B Authentication device (optional device)
9A Option interface device 9d, 9e I / F (inside optional interface device 9A)
9f I / O unit (signal transmission unit, in optional interface device 9A)
9B Option interface device 9j, 9k I / F section (in option interface device 9B)
9m I / O (inside optional interface device 9B)
10 Operation panel (input unit) 100 Copier (image forming apparatus)
S1, S2, S3, S4 Sensor (detection unit) SL Signal line

Claims (4)

An image forming apparatus having a normal mode and a sleep mode that reduces power consumption than the normal mode,
An image forming mechanism for conveying paper and forming an image; a main body control unit for controlling the operation of the image forming mechanism and controlling the image forming apparatus;
A power supply unit that supplies power to the image forming mechanism and the main body control unit in a normal mode, and does not supply power to the image forming mechanism and the main body control unit in a sleep mode;
Monitoring whether a factor for returning from the sleep mode to the normal mode has occurred, and determining that the factor to return has occurred, a monitoring unit for giving an instruction to the power supply unit to supply power in the normal mode;
An option device for determining whether the image forming apparatus can be used, and an option for transmitting data indicating that the return factor has occurred due to an operation and data to be transmitted to the main body control unit Equipment,
The monitoring unit transmits only the return signal indicating that the return factor has occurred, the main body control unit, and an option interface device that relays communication between the option devices ,
The option interface device is connected to the signal transmission unit for transmitting the return signal to the monitoring unit, the option device and the main body control unit, and the main body control unit is activated after the main body control unit is activated by returning to the normal mode. And an interface unit that relays data communication between the optional devices, and selects only data indicating the occurrence of a return factor from the data received from the optional device, and sends the return signal from the signal transmitting unit. An image forming apparatus that is transmitted to a monitoring unit . The monitoring unit is connected to a detection unit that detects that an operation has been performed on the image forming apparatus, an input unit that receives an input, and a signal line, and indicates a signal indicating that an operation has been performed from the detection unit, Upon receiving any of the signals indicating that the input from the input unit has been made, it is determined that the return factor has occurred,
A signal line for transmitting the return signal to the monitoring unit, which is emitted from the option apparatus, according to claim 1, characterized in that the OR connected to the signal line between said detection unit or the input unit the monitoring unit The image forming apparatus described in 1. 3. The image forming apparatus according to claim 1, wherein the optional device is an authentication device that authenticates whether a billing device into which money is inserted and / or an image forming device can be used. 4. The power supply unit shifts to the sleep mode when a predetermined time has elapsed from the end of the printing performed immediately before and / or when the input unit is instructed to shift to the sleep mode. The image forming apparatus according to any one of claims 1 to 3 .

Images