JP4841473B2 - Image processing apparatus and energization control method - Google Patents

Description

  The present invention relates to an image processing apparatus such as a multifunction peripheral or a digital copying machine, and more specifically, a plurality of power supplies for supplying power, and individually operating using any one of the plurality of power supplies as a power source. The present invention relates to an image processing apparatus including a plurality of processing units and an energization control method thereof.

  Conventionally, it has been provided with a plurality of independent power supplies for individually supplying power to a plurality of loads. When one of the plurality of independent power supplies has a power supply abnormality, There has been proposed an image processing apparatus that supplies power (hereinafter also referred to as “alternative power supply”) to a load that uses an independent power source as a power source by using another independent power source that is a power source of another load as an alternative power source. (For example, refer to Patent Document 1).

In addition, an image is provided with a main power source that functions as a power source during normal operation and a standby power source (so-called backup power source) that does not function as a power source during normal operation but functions as an alternative power source only when the main power source is abnormal. A processing apparatus has also been proposed (see, for example, Patent Document 2).
JP 58-29327 A JP 2005-138532 A

  According to the image processing apparatus described in Patent Document 1, when an abnormality occurs in any of the independent power supplies and the alternative power supply is performed, the independent power supply used for the alternative power supply uses the independent power supply as the original power. In addition to the load that is the source, power is also supplied to a load that is powered by another independent power source in which a power supply abnormality has occurred. Therefore, in order to enable such power supply, it is not only necessary to have the power capacity necessary for power supply to the load that is paired during normal operation, but it is necessary to have an extra large power capacity. However, there has been a problem that the cost and the size of the power supply are increased, and the cost and the size of the image processing apparatus are increased.

  Further, according to the image processing apparatus described in Patent Document 2, it is necessary to provide a standby power supply that is not used except when the power supply of the main power supply is abnormal. This causes a problem that the cost and size of the image processing apparatus increase. was there. Also, from the viewpoint of effective use of the power source, it is not preferable in terms of design.

  The present invention was devised to solve such problems, and its purpose is that an abnormality has occurred in a power supply used in a predetermined operation mode without increasing the cost and size of the image processing apparatus in the future. Even in this case, by performing alternative power supply from another power source that is not used in the predetermined operation mode, the stable operation in the predetermined operation mode can be continued, and the image processing apparatus that enables effective use of the power source and its The object is to provide an energization control method.

  In order to solve the above problems, an image processing apparatus according to the present invention uses an operation mode designating unit for designating various operation modes, a plurality of power supplies for supplying power, and any one of the plurality of power supplies as a power source. A plurality of processing units that operate individually, a power source abnormality detecting unit that detects an abnormality of each of the plurality of power sources, and the power source abnormality detecting unit while an arbitrary operation mode is designated and executed by the operation mode designating unit When an abnormality in any power source is detected, the other power source that is not used as the power source in the operation mode being executed is selected, and the power source in which the abnormality is detected is replaced with the processing unit that uses the power source. And an energization control means for supplying power as a power source. In this case, the plurality of processing units are a document reading unit, an image forming unit, and a post-processing unit that performs post-processing on the image-formed paper.

  According to such a configuration, each power supply supplies power to the processing unit corresponding to each operation mode. In other words, each functions as a power source during normal operation. When an abnormality of any power source is detected, another power source that is not used as a power source for the operation mode being executed is connected to a processing unit that uses the power source in which the abnormality is detected as a power source. It is supplied as an alternative power source.

  As described above, in the present invention, when an abnormality occurs in an arbitrary power supply in a predetermined operation mode, a power supply that is not used in the operation mode is used as a power supply for replacing the power supply in which the abnormality has occurred. The operation mode can be stably continued without worrying about power distribution. On the other hand, the use efficiency of each power source is also improved. As a result, it is possible to suppress the increase in cost and size of the apparatus main body while improving the reliability of the image processing apparatus. In addition, since a plurality of power supplies that individually function as power sources for the document reading unit, the image forming unit, and the post-processing unit are provided, the power conversion efficiency of the power source in each unit can be improved.

  More specifically, the plurality of power sources are a plurality of driving system power sources serving as power sources for the driving units of the document reading unit, the image forming unit, and the post-processing unit, and the document reading unit. , And a plurality of control system power supplies serving as power sources for the control units of the image forming unit and the post-processing unit, and the energization control unit detects an abnormality of the drive system power source by the power source abnormality detection unit. If detected, another drive system power supply that is not used as a power source for the operation mode being executed is selected, and used to replace the processing unit that uses the drive system power supply in which the abnormality is detected as a power source. While supplying as a power source, when an abnormality of the control system power supply is detected by the power supply abnormality detection means, select another control system power supply that is not used as a power source of the operation mode being executed, Abnormality detected Constitute a supply as a power source for substitution in the processing unit has a control system power supply, which is a power source.

  In other words, the drive system power supply and the control system power supply in the document reading unit, the image forming unit, and the post-processing unit usually have different voltages. For example, the drive system requires about 24V, the control system requires about 3-5V, and the drive system requires about 80-150W and the control system requires about 20W. Therefore, it is not necessary to perform voltage conversion or the like by performing alternative power supply between the drive system power supply and the control system power supply when the power supply is abnormal, so that the degree of design freedom can be increased.

  Further, according to the present invention, when supplying as the alternative power source, the image processing speed per unit time of the document reading unit and / or the image forming unit is controlled to be lower than that during normal operation. The image processing control means may be provided. More specifically, the image processing control unit controls the image forming unit so that the number of images formed per unit time is smaller than that during normal operation. The image processing control means controls the document reading unit so that the number of images read per unit time is smaller than that during normal operation.

  As described above, when the alternative power supply is performed when the power supply is abnormal, the alternative power supply is performed by reducing the image processing speed (the number of images formed and the number of images read) per unit time of at least one of the image forming unit and the document reading unit. Even when the available power is reduced by this, the image processing can be reliably continued without completely stopping the apparatus main body.

  More specifically, the reduction in the image processing speed will be described. The document reading unit includes a document transport path that transports a document, and a plurality of documents that transport the document disposed at a predetermined interval in the document transport path. A drive source; and a plurality of document detection means for detecting the passage of the document disposed at a predetermined interval in the document transport path, wherein the image processing control means is configured such that the document detection means When passing is detected, a configuration may be adopted in which the nearest drive source located downstream in the document transport direction is driven with respect to the document detecting means that has detected the passage. The image forming unit includes a paper transport path for transporting paper, a plurality of drive sources for transporting the paper disposed at predetermined intervals on the paper transport path, and a predetermined interval on the paper transport path. A plurality of paper detection means for detecting the passage of the paper that is disposed, and the image processing control means detects the passage when the paper detection means detects the passage of the leading edge of the paper. What is necessary is just to set it as the structure which drives the nearest drive source located in a paper conveyance direction downstream with respect to a detection means.

  In other words, not all the drive sources are driven all the time, but only the drive sources at the necessary locations are sequentially driven according to the conveyance of the document or paper, so that the necessary power can be reduced and can be used. It is possible to reliably perform image processing within a range of power.

  The document reading unit includes a document transport path for transporting a document, a plurality of drive sources for transporting the document disposed at a predetermined interval on the document transport path, and a predetermined interval on the document transport path. And a plurality of document detection means for detecting the passage of the document placed in an existing position, and the image processing control means detects the passage when the document detection means detects the passage of the trailing edge of the document. What is necessary is just to make it the structure which stops the drive of the drive source located in the document conveyance direction upstream with respect to a document detection means. The image forming unit includes a paper transport path for transporting paper, a plurality of drive sources for transporting the paper disposed at predetermined intervals on the paper transport path, and a predetermined interval on the paper transport path. A plurality of paper detection means for detecting the passage of the paper that is disposed, and the image processing control means detects the passage when the paper detection means detects the passage of the trailing edge of the paper. What is necessary is just to set it as the structure which stops the drive of the drive source located in a paper conveyance direction upstream with respect to a paper detection means.

  That is, not all the drive sources are driven at all times, but only the drive sources at the necessary locations are sequentially driven according to the conveyance of the document or paper, and the drive sources after passing the document or paper are sequentially stopped. Therefore, it is possible to reduce the required power, and as a result, it is possible to reliably perform image processing within the range of available power.

  In the present invention, the switching control of the alternative power source may be performed using a table. That is, a power supply used in correspondence with each operation mode is associated in advance, and a power supply that is not used in each operation mode is associated in advance as a substitute power supply in the operation mode. A selection correspondence table may be provided, and the energization control unit may be configured to select an alternative power source using the power source selection correspondence table. In this way, by selecting an alternative power source using the power source selection correspondence table, that is, switching control, the alternative power source can be selected accurately and quickly, and efficient use of the power source is facilitated. Can be realized. In addition, when multiple power supplies for alternative power supply are selected, the number of simultaneously driven motors for paper conveyance can be increased, for example, compared to the case of selecting one power supply. Within the range, it is possible to perform reliable image processing while maximizing performance.

  The power selection correspondence table stores a power capacity that is the power upper limit value of the processing unit corresponding to each power source, and the energization control means uses the power selection correspondence table for replacement. When a power source is selected, the stored power capacity may be referred to and a power source having a large power capacity may be selected with priority. By preferentially selecting a power source having a large power capacity, it is possible to minimize a decrease in operating efficiency of a processing unit driven by alternative power feeding.

  Further, the energization control means drives simultaneously among drive sources included in the processing unit driven by the substitute power source based on the power capacity of the substitute power source selected using the power source selection correspondence table. You may comprise so that the number of the drive sources to perform may be determined. By selecting multiple power supplies for alternative power supply, for example, the number of paper drive motors that can be driven simultaneously can be set higher than when a single power supply is selected. Thus, it is possible to perform reliable image processing while demonstrating the above-mentioned ability.

  Further, the energization control method of the present invention includes an operation mode designating unit that designates various operation modes, a plurality of power supplies that supply power, and a plurality of power supplies that individually operate using any one of the plurality of power supplies as a power source. An energization control method for an image processing apparatus, comprising: a processing unit; a power abnormality detection unit that detects an abnormality of each of the plurality of power supplies; and an energization control unit that performs energization control of the plurality of power supplies. The energization control means is executing the step of detecting an abnormality of an arbitrary power source by the power supply abnormality detecting means while the operation mode specifying means is executing an arbitrary operation mode, and when an abnormality is detected. Selecting another power source that is not used as a power source in the operation mode, and selecting the other power source as the processing unit that uses the power source in which the abnormality is detected as a power source. It is characterized by performing the steps of providing, as a power source for substitution in Tsu and.

  According to such a configuration, when an abnormality occurs in an arbitrary power supply in a predetermined operation mode, a power supply that is not used in the operation mode is used as a power supply for replacing the power supply in which the abnormality has occurred. The operation mode can be stably continued without worrying about power distribution. On the other hand, the use efficiency of each power source is also improved. As a result, it is possible to suppress the increase in cost and size of the apparatus main body while improving the reliability of the image processing apparatus.

  Since the image processing apparatus and the energization control method of the present invention are configured as described above, when an abnormality occurs in an arbitrary power supply in a predetermined operation mode, the power supply that is not used in the operation mode is By using the power supply as a substitute for the generated power supply, the operation mode can be stably continued without worrying about power distribution. Thereby, it is possible to suppress the increase in cost and size of the apparatus main body while improving the reliability of the image processing apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram of an image processing apparatus X according to an embodiment of the present invention.

  The image processing apparatus X according to the present embodiment communicates with an external apparatus 31 such as a personal computer via a network 30 such as a LAN (Local Area Network), a WAN (Wide Area Network), or the Internet that conforms to the standard IEEE 802.3. In this embodiment, a NIC (Network Interface Card) 5 is provided as a communication unit configured to be able to communicate with the external device 31. Here, examples of the external device 31 that can communicate with the image processing apparatus X via the network 30 include a terminal of a user of the image processing apparatus X, a terminal of a business operator who performs maintenance of the image processing apparatus X, and other devices. An image processing apparatus or the like can be considered.

  As shown in FIG. 1, the image processing apparatus X includes an operation unit 1, a display unit 2, an HDD (Hard Disc Drive) 3, and an image processing calculation unit 4 in addition to the NIC 5. The image processing apparatus X includes a scanner control unit 6 that is a document reading unit, a scanner unit 6a that includes an automatic document feeder (hereinafter referred to as “ADF”) 6b, a print control unit 7 that is an image forming unit, and a fixing unit. And a post-processing control unit 8 as a post-processing unit, a shifter 8a, a puncher 8b, and a stapler 8c. Further, the image processing apparatus X includes a main control unit 9, a main energization switching circuit 10, a main power source 21, a sub power source 22, and the like.

  In the following description, the scanner control unit 6, the print control unit 7, and the post-processing control unit 8 are collectively referred to as “local control unit”. Further, the operation unit 1, display unit 2, HDD 3, image processing calculation unit 4, NIC 5, scanner control unit 6, scanner unit 6a, ADF 6b, print control unit 7, print unit 7a, fixing heater 7b, post-processing control unit 8 The shifter 8a, the puncher 8b, the stapler 8c, the main control unit 9, and the main energization switching circuit 10 are also collectively referred to as “processing unit”.

  In this embodiment, the main control unit 9, the image processing calculation unit 4, the NIC 5, the scanner control unit 6, the print control unit 7, the post-processing control unit 8, and the main energization switching circuit 10 are connected to each other by a bus 11. ing.

  The operation unit 1 functions as operation input means for inputting desired information, and includes a sheet key, a touch panel provided on the surface of the liquid crystal display device, and the like. The display unit 2 functions as a display unit for desired information and includes a liquid crystal display device, an LED lamp, and the like. That is, the operation unit 1 and the display unit 2 constitute an MMI (Man Machine Interface) for the user.

  The HDD 3 is a large-capacity non-volatile memory that stores processing data as necessary when processing read image data read from a document, printing processing of image data, and the like, and communicates with the image processing apparatus X. In response to a possible request from the external device 31, it is used as a storage destination of the data file transmitted from the external device 31. As described above, the processing for saving the data file transmitted from the external device 31 to the HDD 3, the change of the storage location (data folder) of the saved data file, the change of the file name, the rewriting of the data, the deletion of the data, etc. Hereinafter, the process of performing is referred to as “data filing process”.

  The image processing arithmetic unit 4 is configured by a dedicated signal processing circuit, a DSP (Digital Signal Processor), or the like, performs various image processing on the image data, and print data (image data, print job, etc.) for image formation. Generation, generation of image data to be transmitted to the external device 31 (for example, image data subjected to predetermined encoding such as JPEG format), processing for encrypting the image data, and decoding of the encrypted image data Or a process for compressing and encoding image data, a process for expanding (restoring) the compressed and encoded image data, and the like.

  The scanner control unit 6 controls the scanner unit 6a and the ADF 6b by outputting a control signal to the scanner unit 6a and the ADF 6b that execute processing for reading an image from a document. The scanner unit 6a is a device that reads an image formed on a document from a document placed on a glass document table (not shown) or a document conveyed by the ADF 6b.

  In addition to the ADF 6b, the scanner unit 6a includes, for example, a light source that irradiates light on an image surface of a document, and a mirror that reflects reflected light from the document in a predetermined direction, and is configured to move along the document. A movable optical unit, a motor for driving the movable optical unit, a fixed mirror for guiding light emitted from the movable optical unit along a predetermined path, and a lens for collecting the light, A CCD (Charge Coupled Device) or the like that photoelectrically converts light that has passed through the lens and outputs an electrical signal corresponding to the amount of light is provided.

  When reading the image from the document placed on the document table, the movable optical unit irradiates the image surface with light while moving along the document. On the other hand, when an image is read from a document conveyed by the ADF 6b, the image is fixed at a predetermined position facing the document conveyance path, and light is emitted to the document being conveyed. The electrical signal output from the CCD is output to the image processing calculation unit 4 as image data.

  The ADF 6b is a device that transports documents set on a document supply tray one by one along a predetermined document transport path and discharges them to a document discharge tray. A conveyance roller that also serves as a pickup roller for feeding documents one by one to the conveyance path, a conveyance roller that conveys the document in the document conveyance path, and motors that respectively drive the conveyance rollers are provided.

  The print control unit 7 controls the print unit 7a by outputting a control signal to the print unit 7a that executes processing relating to image forming processing. The printing unit 7a sequentially feeds sheets stored in a sheet feeding cassette (not shown) one by one, conveys the sheets to a discharge tray through a predetermined image forming position, and also reads an image of the document read from the document by the scanner unit 6a. An image is formed on a sheet based on data, print data generated by the image processing calculation unit 4, and the like.

  Here, the image processing apparatus X functions as a copying machine (copying machine) by performing image forming processing based on image data of a document, and image forming processing based on a print request (print job) received from the external apparatus 31. By functioning, the printer functions as a printer.

  The printing unit 7a includes, for example, a photosensitive drum that carries an image, a charging device that charges the photosensitive drum, an exposure device that writes an electrostatic latent image on the surface of the photosensitive drum based on given image data and a print job, A developing device that develops the electrostatic latent image as a toner image, a transfer device that transfers the toner image on the photosensitive drum to a sheet, a motor that drives the photosensitive drum and a roller for conveying the sheet, and the like are provided.

  The printing unit 7a includes a fixing device that heats and fixes the toner image transferred to the paper. The fixing device includes a heating roller in which a fixing heater 7b is incorporated, and a paper on which the toner image is transferred. A pressure roller that is in pressure contact with the heating roller, a motor that drives each of these rollers, and the like are provided.

  That is, the printing unit 7a includes a sheet conveyance path that conveys the sheets set in the sheet supply tray one by one and discharges the sheets to the sheet discharge tray. The sheets are fed from the paper supply tray to the conveyance path. Conveying rollers (R1 in FIG. 7 and the like to be described later) that also serve as pickup rollers for feeding out one sheet at a time, a plurality of conveying rollers (R2 to R5 in FIG. 7 and the like to be described later) for conveying paper in the paper conveying path, Each motor (M1-M5 in FIG. 7 etc. mentioned later) which drives a roller is provided.

  The post-processing control unit 8 outputs control signals to the shifter 8a, the puncher 8b, and the stapler 8c that perform various types of post-processing on the paper on which the image is formed, thereby shifting the shifter 8a, the puncher 8b, and the stapler. 8c is controlled.

  The shifter 8a includes a movable tray provided with a plurality of paper discharge trays. In the print unit 7a, image forming processing for a plurality of sets of image data and print jobs (hereinafter referred to as “one set of jobs”) is continuously performed. In this case, the paper discharged to the paper discharge tray is sorted according to a predetermined rule. The movable tray is configured to be able to move the position of each paper discharge tray with respect to the paper discharge port.

  For example, the shifter 8a controls the movable tray so that the sheet after image formation is discharged for each set of jobs or for each same page with respect to each discharge tray. The puncher 8b performs a process of making punch holes in the recording paper after image formation. The stapler 8c performs a staple binding process on a plurality of recording sheets after image formation.

  The NIC 5 is a communication interface that transmits and receives data to and from the external device 31 through the network 30. For example, the NIC 5 transmits image data generated by the image processing calculation unit 4, image data read by the scanner unit 6 a, or data stored in the HDD 3 to the external device 31, and further from the external device 31. It performs processing for receiving various data processing requests. The data processing request includes a print request (print job) requesting image formation on paper, a scan request requesting reading an image from a document, a data filing request requesting data filing processing, and the like. Is included.

  Further, the NIC 5 receives, from the external device 31, a device information processing request for a predetermined process related to information (hereinafter referred to as “device information”) set in the image processing device X, such as a MAC address or an IP address. And a process of transmitting (replying) a response to the reception to the external device 31 as necessary.

  The main power supply 21 and the sub power supply 22 are power supply circuits that supply power to each component of the image processing apparatus X.

  As will be described later, the main energization switching circuit 10 switches a part of the main control unit 9 and the like by switching whether one of the sub power sources 22 is connected to a commercial power source in accordance with a control signal received from the NIC 5. This is a switch circuit for switching whether to energize the device. Details of this will be described later. Further, the main energization switching circuit 10 is configured such that the switching state is changed also by a control signal received from the operation unit 1.

  The main control unit 9 controls each of the operation unit 1, the display unit 2, the HDD 3, and the image processing calculation unit 4, and further, data executed by each control unit among the local control units 6 to 8. Information necessary for processing and information obtained by data processing are exchanged.

  For example, the main control unit 9 performs, for the print control unit 7, the size of the sheet serving as the image formation destination, the reduction ratio and density correction value of the output image, whether to perform color image formation processing or monochrome image formation processing, etc. In the meantime, the print control unit 7 obtains information on how many sheets the image formation has been completed, information on errors that have occurred in the print unit 7a, and the like.

  The main control unit 9 transmits information on the image reading range of the original to the scanner control unit 6, while the scanner control unit 7 completes image reading up to what number of originals using the ADF 6b. Information, image data read by the scanner unit 6a, information on an error occurring in the ADF unit 6b, and the like are acquired.

  Further, the main control unit 9 transmits information on the type of sorting process by the shifter 8a, information on the number of sheets to be punched or stapled by the puncher 8b or the stapler 8c, and the like to the post-processing control unit 8. On the other hand, from the post-processing control unit 8, error information generated in the shifter 8a, the puncher 8b, and the stapler 8c is acquired.

  As described above, the main control unit 9, HDD 3, scanner control unit 6, scanner unit 6a, print control unit 7, print unit 7a, post-processing control unit 8, and post-processing units 8a to 8c have their respective functions. It is a processing unit configured as a part or a set of parts divided according to each other.

  In addition, the HDD 3 having a motor that rotates the hard disk and the main control unit 9 that controls the HDD 3 have a relationship in which the main control unit 9 is higher and the HDD 3 is lower.

  The main control unit 9 is a processing unit that exchanges information necessary for data processing or information obtained by data processing between the plurality of local control units 6 to 8. Each of the control units 6 to 8 has a lower relationship.

  Further, the scanner unit 6a having various motors as processing units to be controlled and the post-processing units 8a to 8c are subordinate, and the scanner control unit 6 on the side controlling the scanner unit 6a and post-processing units 8a to 8c. And the post-processing control unit 8 has a higher order relationship.

  In addition, there is a relationship in which the print unit 7a having various motors that are processing units to be controlled and the fixing heater 7b is lower, and the print control unit 7 that controls the print unit 7a is higher. Yes.

  In summary, the highest processing unit is the main control unit 9, the next lower processing unit is the local control unit 6-8, and the next lower (lowest) processing unit is the scanner unit 6a, the printing unit. 7a and post-processing units 8a to 8c. Thus, each processing unit has a hierarchical relationship from the upper level to the lower level.

  FIG. 2 shows a power system diagram of the image processing apparatus X having the above configuration. However, in FIG. 2, the power supply line is indicated by a solid line, and the other signal transmission lines are indicated by a broken line and an arrow line. With reference to the power supply system diagram shown in FIG. 2, the connection relationship of the power supply to each processing unit will be described.

  In the present embodiment, the image processing apparatus X includes one main power source 21 and nine sub power sources 22. Hereinafter, these nine sub power sources 22 are referred to as a first sub power source 221 to a ninth sub power source 229, respectively.

  The main power source 21 is a power source (power source) that supplies power to the NIC 5, the operation unit 1, and the main energization switching circuit 10. The main power source 21 is connected to a commercial power source 50 serving as a main power source for the entire image processing apparatus X via a manual changeover switch 40 that switches between turning on and off the power supply line according to a manual operation. Yes.

  Then, when the user of the image processing apparatus X performs the switching operation of the manual changeover switch 40, whether the NIC 5, the operation unit 1, and the main energization switching circuit 10 are energized is switched. Therefore, in the state where the image processing apparatus X is connected to the commercial power supply 50, the NIC 5, the operation unit 1, and the main energization switching circuit 10 are switched from the conductive state to the cutoff state by the user's operation. Unless otherwise, it is always energized. Further, when the manual changeover switch 40 is switched to the cut-off state, the entire image processing apparatus X enters a non-energized state (cut-off state).

  The first sub power supply 221 is a power supply circuit as a power source for the main control unit 9, the display unit 2, and the image processing calculation unit 4. The second sub power supply 222 is a power supply circuit as a power source for the scanner control unit 6, and is connected via the power supply relay unit 60. The third sub power supply 223 is a power supply circuit as a power source for the print control unit 7, and is connected via the power supply relay unit 60. The fourth sub power supply 224 is a power supply circuit as a power source for the post-processing control unit 8, and is connected via the power supply relay unit 60.

  The fifth sub power supply 225 is a power supply circuit as a power source for the HDD 3. The sixth sub power supply 226 is a power supply circuit as a power source for the scanner unit 6 a and is connected via the power supply relay unit 60. The seventh sub power supply 227 is a power supply circuit as a power source for other devices excluding the fixing heater 7 b in the print unit 7 a, and is connected via the power supply relay unit 60.

  The eighth sub power supply 228 is a power supply circuit as a power source for the fixing heater 7b. The ninth sub power supply 229 is a power supply circuit as a power source for each of the post-processing units 8 a to 8 c and is connected via the power supply relay unit 60.

  Each of the first sub-power supply 221 to the ninth sub-power supply 229 switches the automatic power supply line to the commercial power supply 50 and whether to switch the power supply line on or off based on a predetermined control signal. These are connected via change-over switches 41 to 49, respectively.

  That is, as apparent from FIG. 2, the automatic changeover switch 41 and the first sub power supply 221, the automatic changeover switch 42 and the second sub power supply 222,..., The automatic changeover switch 49 and the ninth sub power supply 229 correspond to each other. It is in. Therefore, after the manual changeover switch 40 is turned on, the lines are connected so that the sub power sources 221 to 229 are turned on only after the automatic changeover switches 41 to 49 are turned on. .

  Hereinafter, turning on the power supply line is referred to as “ON”, and shutting off is referred to as “OFF”. Similarly, the state in which the power supply line is conducted is referred to as “ON state”, and the state in which the power supply line is shut off is referred to as “OFF state”.

  Each of the automatic changeover switches 41 to 49 corresponds to each of the corresponding processing units 2 to 4, 6 to 9, 6 a, 7 a, 7 b, and 8 a to 8 c depending on whether each of them is turned on or off. It functions as energization switching means for switching whether or not to energize individually.

  As shown in FIG. 2, the automatic changeover switch 41 is controlled to be turned on or off (hereinafter referred to as “ON / OFF”) by a main energization switching circuit 10 that operates according to a control signal from the NIC 5. That is, the NIC 5 and the main energization switching circuit 10 control the energization of the main control unit 9, the display unit 2, and the image processing calculation unit 4 by controlling ON / OFF of the automatic changeover switch 41.

  As described above, the NIC 5 also serves as a part of means for executing energization control for each processing unit. Hereinafter, a part (specifically, a program module related to the control of the main energization switching circuit 10 executed by the MPU and the MPU) that realizes the control function of the main energization switching circuit 10 among the components of the NIC 5 is referred to as “ This is referred to as “first energization control execution unit”.

  The first energization control execution unit of the NIC 5 controls only the automatic changeover switch 41 that switches the energization to the main control unit 9 that is the highest processing unit among the automatic changeover switches 41 to 49. Note that the first energization control execution unit of the NIC 5 outputs a control signal to the main energization switching circuit 10 through the bus 11 (see FIG. 1).

  Further, the automatic control switches 42 to 45 other than the automatic switch 41 are all turned on / off by the main controller 9. That is, the main control unit 9 controls energization of each of the local control units 6 to 8 and the HDD 3 which are processing units one level lower than the main control unit 9.

  The automatic changeover switch 46 is ON / OFF controlled by the scanner control unit 6, the automatic changeover switches 47 and 48 are ON / OFF controlled by the print control unit 7, and the automatic changeover switch 49 is turned on by the post-processing control unit 8. / OFF is controlled. That is, the scanner control unit 6 controls energization to the scanner unit 6a which is a processing unit one level lower than that. Similarly, the print control unit 7 controls energization to the print unit 7a which is a processing unit one level lower than that. Further, the post-processing control unit 8 controls energization to the post-processing driving units 8a to 8c which are processing units one level lower than the post-processing control unit 8. In addition, each control part 6-9 outputs a control signal with respect to each automatic changeover switch 42-49 through the I / O port with which each is provided, and the process which outputs the control signal is each control part 6- This is realized by the MPU included in 9 executing a predetermined program.

  Hereinafter, among the components of the control units 6 to 9, a part for realizing the control function of the automatic changeover switches 42 to 49 (specifically, control of the MPU and the automatic changeover switches 42 to 49 executed by the MPU) Program module) is referred to as a “second energization control execution unit”. The second energization control execution unit of each of the control units 6 to 9 controls only the switching of energization to other processing units one level lower than its own processing unit among the corresponding automatic changeover switches 42 to 49. .

  Next, the basic operation of energization control for each processing unit will be described. First, the basic operation when starting energization of each processing unit when each processing unit is not energized will be described. Hereinafter, a state in which the processing unit is not energized is referred to as a “non-energized state”, and a state in which the processing unit is energized is referred to as a “energized state”.

  First, the first energization control execution unit and the main energization switching circuit 10 in the NIC 5 switch the automatic changeover switch 41 from the OFF state to the ON state. As a result, the energization state for the main control unit 9 which is the highest processing unit is switched from the “no energization state” to the “energization present state”.

  Next, when the main control unit 9 enters the “energized state”, the second energization control execution unit in the main control unit 9 controls each of the automatic changeover switches 42 to 45, and is one level lower than the main control unit 9. Are switched from the OFF state to the ON state. As a result, the processing unit (one or more of the HDD 3 and the local control units 6 to 8) one level lower than the main control unit 9 is switched to the “energized state”.

  Further, when the local control units 6 to 8 are in the “energized state”, the second energization control execution unit in the local control units 6 to 8 controls the automatic changeover switches 46 to 49, respectively, and the local control units 6 to 8 are controlled. On the other hand, the processing unit one level lower (processing unit that needs to be energized) is switched from the OFF state to the ON state. Accordingly, the processing unit (one or more of the scanner unit 6a, the printing unit 7a, and the post-processing units 8a to 8c) lower than the local control units 6 to 8 is switched to the “energized state”.

  As described above, in the image processing apparatus X, the processing unit is set to “no power supply” by the processing operation of the first energization control execution unit in the NIC 5, the main energization switching circuit 10, and the second energization control execution unit in each of the control units 6 to 9. When switching from the “state” to the “energized state”, the hierarchical energization control process for switching the processing unit from the upper one to the lower one in turn to the “energized state” is executed.

  Next, the basic operation when the power supply to each processing unit is cut off when each processing unit is in the “energized state” will be described in (1) to (4).

  (1) When the first energization control execution unit in the NIC 5 switches the main control unit 9 to be controlled from the “energized state” to the “no energized state”, first, in a processing unit lower than the main control unit 9 It is confirmed that all of the local control units 6 to 8 and the lower processing units of the scanner unit 6a, the printing unit 7a, and the post-processing units 8a to 8c are in the “no power supply state”. Only when the “no power supply state” can be confirmed, the automatic selector switch 41 is switched from the ON state to the OFF state. On the other hand, when the “no power supply state” cannot be confirmed, switching the automatic changeover switch 41 from the ON state to the OFF state is prohibited.

  (2) When the second energization control execution unit in the main control unit 9 switches the scanner control unit 6 to be controlled from the “energized state” to the “no energized state”, all the lower-order components than the scanner control unit 6 It is confirmed that the processing unit (scanner unit 6a) is in the “no power supply state”. Then, only when the “non-energized state” is confirmed, the automatic selector switch 42 is switched from the ON state to the OFF state. On the other hand, when the “non-energized state” cannot be confirmed, switching the automatic changeover switch 42 from the ON state to the OFF state is prohibited.

  (3) When the second energization control execution unit in the main control unit 9 switches the print control unit 7 to be controlled from the “energized state” to the “non-energized state”, all lower-order than the print control unit 7 It is confirmed that the processing unit (print unit 7a) is in the “no power supply state”. Only when the “no power supply state” can be confirmed, the automatic selector switch 43 is switched from the ON state to the OFF state. On the other hand, when the “non-energized state” cannot be confirmed, switching the automatic selector switch 43 from the ON state to the OFF state is prohibited.

  (4) When the second energization control execution unit in the main control unit 9 switches the post-processing control unit 8 to be controlled from the “energized state” to the “no energized state”, it is further lower than the post-processing control unit 8 It is confirmed that all the processing units (post-processing units 8a to 8c) are in the “non-energized state”. Then, only when the “non-energized state” is confirmed, the automatic selector switch 44 is switched from the ON state to the OFF state. On the other hand, when the “non-energized state” cannot be confirmed, switching the automatic changeover switch 44 from the ON state to the OFF state is prohibited.

  As described above, in the image processing apparatus X of the present embodiment, the first energization control execution unit of the NIC 5 and the second energization control execution unit of the main control unit 9 (subordinate to the processing unit that is the target of the energization control). When a processing unit that is one level lower in the hierarchy is switched to the “no power” state by the processing operation (with a processing unit), or when it is confirmed that the lower processing unit is in the “no power” state Only the switching operation is performed. As a result, the local control units 6 to 8 which are processing units on the control side are “not energized” before the scanner unit 6a, the printing unit 7a and the post-processing units 8a to 8c which are processing units on the controlled side. It is possible to surely prevent an inconvenient situation such as switching to the “state”.

  Here, a specific method for confirming the energization state of the processing unit further lower than the processing unit to be energized as described above will be described below.

  As an example of a specific method, it is conceivable to inquire about the energization state of the processing unit on the lower side of the processing unit in the “energized state” to be controlled, and to confirm based on the response to this inquiry. Here, the inquiry is, for example, that the energization control execution unit transmits a state confirmation request signal to the processing unit, and the response is, for example, a state where the processing unit is energized or de-energized to the energization control execution unit. Is transmitted.

  As another example, it is conceivable to store the latest energization state of each processing unit in the flash memory of the NIC 5 and check the energization state of the lower processing unit by referring to the stored contents. In this case, each processing unit having the second energization control execution unit is provided with a function of notifying the NIC 5 of the switching information of the energization state of the processing unit one layer lower, and further, the NIC 5 is notified by each processing unit. Based on this, a function for storing the latest energization state of each processing unit in the flash memory may be provided.

  In the present embodiment, a power relay unit 60 is provided in the image processing apparatus X. On the input side of the power supply relay unit 60, the main energization switching circuit 10, the second sub power supply 222, the third sub power supply 223, the fourth sub power supply 224, the sixth sub power supply 226, the seventh sub power supply 227, and the ninth sub power supply. 229 is connected. The output side of the power supply relay unit 60 is connected to a scanner control unit 6, a scanner unit 6a, a print control unit 7, a print unit 7a, a post-processing control unit 8, and post-processing driving units 8a to 8c. Further, the power relay unit 60 is connected to the main energization switching circuit 10 through a control signal line.

  That is, a power line is input from the second sub power source 222, the third sub power source 223, the fourth sub power source 224, the sixth sub power source 226, the seventh sub power source 227, and the ninth sub power source 229 to the power relay unit 60, and the power relay Output lines from the unit 60 are connected to the scanner control unit 6, the scanner unit 6a, the print control unit 7, the print unit 7a, the post-processing control unit 8, and the post-processing driving units 8a to 8c. Then, a switching control signal is output from the main energization switching circuit 10 to the power relay unit 60, so that a predetermined sub power source and a predetermined processing unit are connected, and power is supplied from the sub power source to the processing unit. It has become. Hereinafter, the scanner control unit 6, the print control unit 7, and the post-processing control unit 8 are also referred to as a control system (control unit), and the scanner unit 6a, the print unit 7a, and the post-processing drive units 8a to 8c are also referred to as drive systems (drive units).

  FIG. 3 is an electric circuit diagram of the power relay unit 60 provided in the image processing apparatus X.

  As shown in FIG. 3, the power relay unit 60 includes the second to fourth sub power sources 222 to 224, the sixth to seventh sub power sources 226 and 227, and the ninth sub power source 229. 2nd-4th change-over switch SW2-SW4, 6th-7th change-over switch SW6, SW7, and 9th change-over switch SW9 are provided.

  The second sub power source 222 is connected to the switching piece A2 of the second selector switch SW2, and the three contacts B2-1, B2-2, and B2-3 of the second selector switch SW2 are scanners that are control systems. Each of the control unit 6, the print control unit 7, and the post-processing control unit 8 is connected.

  The third sub power source 223 is connected to the switching piece A3 of the third selector switch SW3, and the three contacts B3-1, B3-2, and B3-3 of the third selector switch SW3 are scanners that are control systems. Each of the control unit 6, the print control unit 7, and the post-processing control unit 8 is connected.

  The fourth sub power source 224 is connected to the switching piece A4 of the fourth selector switch SW4, and the three contacts B4-1, B4-2, and B4-3 of the fourth selector switch SW4 are scanners that are control systems. Each of the control unit 6, the print control unit 7, and the post-processing control unit 8 is connected.

  The sixth sub power source 226 is connected to the switching piece A6 of the sixth selector switch SW6, and the three contacts B6-1, B6-2, and B6-3 of the sixth selector switch SW6 are scanners that are drive systems. Connected to each of the unit 6a, the printing unit 7a, and the post-processing units 8a to 8c.

  The seventh sub power source 227 is connected to the switching piece A7 of the seventh selector switch SW7, and the three contacts B7-1, B7-2, and B7-3 of the seventh selector switch SW7 are scanners that are drive systems. Connected to each of the unit 6a, the printing unit 7a, and the post-processing units 8a to 8c.

  The ninth sub power source 229 is connected to the switching piece A9 of the ninth selector switch SW9, and the three contacts B9-1, B9-2, B9-3 of the ninth selector switch SW9 are scanners that are drive systems. Connected to each of the unit 6a, the printing unit 7a, and the post-processing units 8a to 8c.

  The main energization switching circuit 10 monitors the output voltages on the secondary side of the second to fourth sub power supplies 222 to 224 and the sixth, seventh, and ninth sub power supplies 226, 227, and 229 and is below a predetermined voltage. Power failure detection means 61 (see FIG. 3 to be described later), a power source selection correspondence table D (see FIGS. 3 and 5 to be described later), and operation modes for designating various operation modes of the image processing apparatus X A power supply abnormality is detected by a designation means 64 (see FIG. 3 to be described later), a selection operation means 65 (see FIG. 3 to be described later) for selectively operating the processing unit according to the designated operation mode, and a power supply abnormality detection means 61. Then, an energization control means 62 (see FIG. 3 to be described later) that performs switching control of the power supply relay unit 60 in order to supply power to a processing unit that requires power from another sub power source that operates normally. Eteiru.

  In the above connection configuration, the second to fourth sub power sources 222 to 224, the sixth to seventh sub power sources 226 and 227, and the ninth sub power source 229 are selectively switched and controlled as follows.

  First, when a predetermined time elapses without an operation request for each of the copy, print, and scan operation modes, each of the sub power sources 222 to 224, 226, 227, and 229 is turned off and enters a standby state. In the standby state, when the user performs an operation for instructing any one of copy, print, and scan from the operation unit 1 or when the NIC 5 receives external print data, these operations or print data Based on the reception, the operation mode specifying unit 64 determines the operation mode, and specifies the determined operation mode to the selection operation unit 65. The selection operation means 65 controls the automatic changeover switches 41 to 49 so as to selectively operate the processing unit according to the designated operation mode. The automatic changeover switches 41 to 49 selectively turn on one or more sub power supplies 222 to 224, 226, 227, and 229 corresponding to each operation mode. As a result, the primary power is supplied to the sub power sources 222 to 224, 226, 227, and 229 that are turned on.

  In this state, when power is cut off because an abnormality has occurred in the third sub power supply 223 corresponding to, for example, the print control unit 7 of the control system, a power supply abnormality of the third sub power supply 223 is detected by the power supply abnormality detection means 61. Detected. On the basis of the detection signal from the power supply abnormality detection means 61, the energization control means 62 selects one of the second and fourth changeover switches SW2 and SW4 corresponding to the scanner control unit 6 and the post-processing control unit 8 which are other control systems. One of the switching pieces A2, A4 is switched to the contact B2-2, B4-2 side which is the energizing side to the print control unit 7. Thereby, although the third sub power source 223 is in the energization cut-off state, alternative energization (alternate power supply) is performed to the print control unit 7, and the print control unit 7 can continue to operate thereafter. It becomes possible.

  Further, when the power supply is interrupted due to a power failure in the seventh sub power supply 227 corresponding to, for example, the printing unit 7a of the drive system, a power failure in the seventh sub power supply 227 is detected by the power failure detection means 61. The Based on the detection signal of the power supply abnormality detection means 61, the energization control means 62 is one of the sixth and ninth change-over switches SW6 and SW9 corresponding to the scanner unit 6a and the post-processing units 8a to 8c, which are other drive systems. The switching pieces A6 and A9 are switched to the contact points B6-2 and B9-2 which are the energization side to the printing unit 7a. As a result, although the seventh sub power supply 227 is in the energization cut-off state, alternative energization (alternate power supply) is performed to the print unit 7a, and the print unit 7a can continue to operate thereafter. Become.

  As described above, even when the print control unit 7 and the third and seventh sub power sources 223 and 227 of the print unit 7a are cut off due to power failure, the other second and fourth sub power sources 222 and 224, and By performing the alternative power supply with the sixth and ninth sub power supplies 226 and 229, the operations of the print control unit 7 and the print unit 7a are continued.

  In the present embodiment, the second to fourth sub power sources 222 to 224 are individually provided in pairs with respect to the control system of the scanner control unit 6, the print control unit 7, and the post-processing control unit 8. Since the sixth, seventh, and ninth sub power supplies 226, 227, and 229 are individually paired with respect to the drive system of the unit 6a, the print unit 7a, and the post-processing drive units 8a to 8c, the image Since each processing unit of the processing apparatus X is operated by a dedicated sub power source, the power conversion efficiency of the power source can be improved.

  Further, the voltage and power capacity required for each power supply are different between the drive system and the control system. For example, the voltage is generally 24 V in the drive system, the power capacity is 80 to 150 W, and the voltage is 3 to 5 V in the control system. The power capacity is required to be about 20W. Accordingly, in the present embodiment, based on this, the driving between the second to fourth sub power sources 222 to 224 provided in the scanner control unit 6, the print control unit 7, and the post-processing control unit 8, which are control systems, is driven. Each of the sixth, seventh, and ninth sub power sources 226, 227, and 229 provided in the scanner unit 6a, the printing unit 7a, and the post-processing units 8a to 8c, which are systems, can be replaced. Thereby, since it is not necessary to perform voltage conversion etc., the design freedom at the time of constructing | assembling the combination of alternative electric power feeding can be raised.

  FIG. 4 is a chart showing a list of sub power sources that are used (turned on) and sub power sources that are not used (turned off) corresponding to each operation mode during normal operation.

  In FIG. 4, the second to fourth sub power supplies are control system power supplies (power supply type A), and the power capacity is 20 W. The sixth, seventh, and ninth sub power sources are drive system power sources (power source type B). The sixth sub power source has a power capacity of 80 W, the seventh sub power source has a power capacity of 150 W, and the ninth sub power source has power. The capacity is 100W. Whether or not each sub-power supply is used corresponding to the type of operation mode is determined.

  In the normal operation in which no power supply abnormality has occurred, as shown in FIG. 4, the second sub power supply 222 of the control system operates in the copy operation mode (both when there is post-processing and when there is no post-processing) and the scanner operation mode. And is not turned on in the printer operation mode (both with and without post-processing). Accordingly, the scanner control unit 6 connected to the second sub power source 222 is supplied with power from the second sub power source in the copy operation mode (both when there is post-processing and when there is no post-processing) and the scanner operation mode. In the operation mode (both with and without post-processing), no power is supplied.

  The third sub power source 223 of the control system is turned on in the copy operation mode (both when there is post-processing and when there is no post-processing) and the printer operation mode (both when there is post-processing and when there is no post-processing). It is not turned ON in the operation mode. Accordingly, the print control unit 7 connected to the third sub power source 223 has both a copy operation mode (both when there is post-processing and when there is no post-processing) and a printer operation mode (both when there is post-processing and when there is no post-processing). ), Power is supplied from the third sub power source 223, and no power is supplied in the scanner operation mode.

  The fourth sub power source 224 of the control system is turned on when there is post-processing in the copy operation mode and when there is post-processing in the printer operation mode, and when there is no post-processing in the copy operation mode, It is not turned on in the case where there is no post-processing and in the scanner operation mode. Accordingly, the post-processing control unit 8 connected to the fourth sub power source 224 is supplied with power from the fourth sub power source 224 when there is post-processing in the copy operation mode and when there is post-processing in the printer operation mode. In the case where there is no post-processing in the copy operation mode, in the case where there is no post-processing in the printer operation mode, and in the scanner operation mode, power is not supplied.

  Further, the sixth sub power source 226 of the drive system is turned on in the copy operation mode (both when there is post-processing and when there is no post-processing) and the scanner operation mode, and both in the printer operation mode (when there is post-processing and when there is no post-processing). It is not turned on in (B). Accordingly, the scanner unit 6a connected to the sixth sub power supply 226 is supplied with power from the sixth sub power supply 226 in the copy operation mode (both when there is post-processing and when there is no post-processing) and in the scanner operation mode. In the operation mode (both with and without post-processing), no power is supplied.

  The seventh sub power source 227 of the drive system is turned on in the copy operation mode (both when there is post-processing and when there is no post-processing) and the printer operation mode (both when there is post-processing and when there is no post-processing). It is not turned ON in the operation mode. Therefore, the printing unit 7a connected to the seventh sub power supply is in the copy operation mode (both when there is post-processing and when there is no post-processing) and the printer operation mode (both when there is post-processing and when there is no post-processing). Power is supplied from the seventh sub power source 227, and power is supplied in the scanner operation mode.

  The ninth sub power source 229 of the drive system is turned on when there is post-processing in the copy operation mode and when there is post-processing in the printer operation mode, and when there is no post-processing in the copy operation mode, It is not turned on in the case where there is no post-processing and in the scanner operation mode. Accordingly, the shifter 8a, puncher 8b, and stapler 8c connected to the ninth sub power source 229 receive power from the ninth sub power source 229 when there is post-processing in the copy operation mode and when post-processing in the printer operation mode. Is supplied, and no power is supplied when there is no post-processing in the copy operation mode, when there is no post-processing in the printer operation mode, and in the scanner operation mode.

  Thus, as shown in the correspondence table of FIG. 4, there is a sub power supply that is not used depending on the operation mode. Therefore, if an abnormality occurs in any of the sub power supplies that are turned on during that operation mode and the power is cut off, another sub power supply that is not used in that operation mode is used as an alternative power supply. Is possible.

  Specifically, the fourth sub power source 224 and the ninth sub power source 229 are turned off when there is no post-processing in the copy operation mode, and the second sub power source 222 is turned off when there is no post-processing in the printer operation mode. The fourth sub power source 224, the sixth sub power source 226, and the ninth sub power source 229 are turned off, and when the post-processing of the printer operation mode is performed, the second sub power source 222 and the sixth sub power source 226 are turned off, and the scanner In the operation mode, the third sub power source 223, the fourth sub power source 224, the seventh sub power source 227, and the ninth sub power source 229 are turned off.

  Therefore, in the present embodiment, in each of the above operation modes, these sub power sources that are turned off are used as alternative power sources.

  FIG. 5 shows a power supply selection correspondence table D in which a power supply that is not used in each operation mode is assigned in advance as an alternative power supply in the operation mode. In the power source selection correspondence table D, the power capacity (W) that is the power upper limit value of the processing unit corresponding to each sub power source is also described. The fifth sub power source 225 and the eighth sub power source 228 are not used as alternative power sources. The power source selection correspondence table D is stored in association with the main energization switching circuit 10.

  The energization control unit 62 of the main energization switching circuit 10 selects a power source when an arbitrary power source abnormality is detected by the power source abnormality detecting unit 61 while an arbitrary operation mode is specified by the operation mode specifying unit 64 and is being executed. An alternative power source is selected using the correspondence table D, and the selected alternative power source is supplied to a processing unit that uses the power source in which an abnormality is detected as a power source. Hereinafter, a method for selecting an alternative power source will be described in detail.

  When there are a plurality of alternative power sources (hereinafter referred to as “alternative power sources”), the alternative power source to be used is given priority to a power source having a large power capacity. That is, in FIG. 5, the alternative power source 1 (denoted as “alternative 1” in FIG. 5) has priority over the alternative power source 2 (denoted as “alternative 2” in FIG. 5). In the case where the power capacities are the same, each is indicated as an alternative power source 1.

  The selection of the alternative power source to be used includes a case where only one alternative power source is selected and a case where a plurality of alternative power sources are selected. When only one alternative power source is selected, the alternative power source having a large power capacity is selected. When the power capacity required for the processing unit having a power failure exceeds the power capacity of the alternative power source 1, it is possible to secure a larger power capacity by selecting a plurality of alternative power sources.

  The selection of the alternative power source is basically preferably selected from the sub power sources indicated as “Alternative 1” and “Alternative 2” in FIG. 5 in terms of the design of the energization control means 62 (see FIG. 3). However, the power of these “alternate 1” and “alternate 2” even in the operation mode in which “alternate 1” and “alternate 2” do not exist or in the operation mode in which “alternate 1” and “alternate 2” exist When the capacity alone is insufficient to operate a processing unit in which a power abnormality has occurred, one of the power supplies of the processing unit that is the operation target (that is, a power supply indicated as “ON”) Or you may comprise so that it may use combining plurality.

  Here, in the case of using the control system power supply (power supply type A), when there is no post-processing in the copy operation mode, the fourth sub power supply 224 that is not turned on during the normal operation is used as the alternative power supply 1. On the other hand, when there is post-processing in the copy operation mode, the alternate power supply cannot be used because all the sub power supplies are turned on during normal operation.

  When there is no post-processing in the printer operation mode, one or both of the second sub power source 222 and the fourth sub power source 224 that are not turned on during normal operation are used as the alternative power source 1. On the other hand, when there is post-processing in the printer operation mode, the second sub power supply 222 that is not turned ON during normal operation is used as the alternative power supply 1.

  In the scanner operation mode, one or both of the third sub power supply 223 and the fourth sub power supply 224 that are not turned on during normal operation are used as the alternative power supply 1.

  Next, in the case of using the drive system power supply (power supply type B), if there is no post-processing in the copy operation mode, the ninth sub power supply 229 that is not turned ON during normal operation is used as the alternative power supply 1. On the other hand, when there is post-processing in the copy operation mode, the alternate power supply cannot be used because all the sub power supplies are turned on during normal operation.

  When there is no post-processing in the printer operation mode, the sixth sub power source 226 and the ninth sub power source 229 that are not turned ON during normal operation are used as alternative power sources. In this case, since the ninth sub power source 229 is “alternative 1” and the sixth sub power source 226 is “alternative 2”, the ninth sub power source 229 is preferentially used as the alternative power source 1. If the power of the ninth sub power source 229 is insufficient, the sixth sub power source 226 is also used as the alternative power source 2. In the present embodiment, the power capacity of the sixth sub power source 226 is 80 W, and the power capacity of the ninth sub power source 229 is 100 W. Therefore, the ninth sub power source 229 having a large power capacity is used as the alternative power source 1, and the sixth sub power source 226 is used as the alternative power source 2.

  Further, when there is post-processing in the printer operation mode, the sixth sub power source 226 that is not turned ON during normal operation is used as the alternative power source 1.

  In the scanner operation mode, the seventh sub power supply 227 and the ninth sub power supply 229 that are not turned ON during normal operation are used as alternative power supplies. In this case, since the seventh sub power source 227 is “alternative 1” and the ninth sub power source 229 is “alternative 2”, the seventh sub power source 227 is preferentially used as the alternative power source 1. If the seventh sub power source 227 alone has insufficient power, the ninth sub power source 229 is also used as the alternative power source 2. In the present embodiment, the power capacity of the seventh sub power source 227 is 150 W, and the power capacity of the ninth sub power source 229 is 100 W. Accordingly, the seventh sub power source 227 having a large power capacity is used as the alternative power source 1, and the ninth sub power source 229 is used as the alternative power source 2.

  Here, a case where a plurality of alternative power supplies are selected will be described.

  For example, when there is no post-processing in the printer operation mode, a plurality of alternative power supplies can be selected. That is, as shown in FIG. 5, when the drive system power supply (power supply type B) is used, both the sixth sub power supply 226 and the ninth sub power supply 229 that are not turned on during normal operation can be used as alternative power supplies. That is, when a power supply abnormality occurs in the seventh sub power supply 227 corresponding to the printing unit 7a of the drive system and the power supply is cut off, the power supply abnormality detection unit 61 detects the power supply abnormality of the seventh sub power supply 227. Based on the detection signal from the power supply abnormality detection means 61, the energization control means 62 includes both the sixth changeover switch SW6 corresponding to the drive system scanner section 6a and the ninth changeover switch SW9 corresponding to the post-processing sections 8a to 8c. The switching pieces A6 and A9 are switched to the contact points B6-2 and B9-2 which are energization sides to the printing unit 7a. As a result, even when the seventh sub power source 227 is turned off, alternative power feeding to the printing unit 7a is performed, so that the printing unit 7a can continue to operate. In this case, since both the power capacity 80 W of the sixth sub power source 226 and the power capacity 100 W of the ninth sub power source 229 are used as alternative power sources, the power capacity of the entire alternative power source is 180 W. Therefore, even when the seventh sub power supply 227 has a power failure, it is possible to secure a power capacity that exceeds the required power capacity.

  FIG. 6 is a flowchart for explaining the processing operation when the power source is selected. The power supply selection process using the power supply selection correspondence table D is performed in the main energization switching circuit 10, and the power supply abnormality detecting means 61 detects that there is a power supply abnormality in the sub power supply used corresponding to the operation mode of the image processing apparatus X. Then, a sub power source that is not used corresponding to the operation mode of the image processing apparatus X is selected from the power source selection correspondence table D and used as an alternative power source. Hereinafter, description will be given with reference to the flowchart shown in FIG.

  When the image processing apparatus X starts a predetermined operation mode, the power supply abnormality detection means 61 is the second to fourth power sources that are the respective power sources of the scanner control unit 6, the print control unit 7, and the post-processing control unit 8 of the control system. The sub power sources 222 to 224 and the sixth, seventh, and ninth sub power sources 226, 227, and 229 which are power sources of the scanner unit 6a, the printing unit 7a, and the post-processing driving units 8a to 8c of the driving system are abnormal. It is monitored whether it has occurred (step ST1). As a result, when it is determined that there is no power supply abnormality (when it is determined No in step ST1), the operation proceeds to step ST2, and each sub power supply is turned on based on the power supply selection correspondence table D of FIG. To do.

  On the other hand, when it is determined that there is a power supply abnormality (when it is determined Yes in step ST1), the operation proceeds to step ST3, and whether or not the alternative power supply 1 is set in the current operation mode is selected. Check by referring to the correspondence table D. As a result, when the alternative power source 1 is not set (when it is determined No in step ST3), since no other alternative power source is prepared for the power failure, the operation proceeds to step ST9. The power supply abnormality is displayed on the display unit 2 and the process is terminated.

  On the other hand, when the alternative power source 1 is set in the current operation mode (when determined Yes in step ST3), whether or not an abnormality has occurred in the sub power source designated as the alternative power source 1 is determined. Is determined (step ST4). As a result, when there is no abnormality in the sub power supply designated as the alternative power supply 1 (when it is determined No in step ST4), it is determined that the alternative power supply 1 is normal, and the sub power supply is used as the alternative power supply. 1 is selected (step ST5). When the alternative power source 1 is selected in step ST5, if there are a plurality of alternative power sources 1, one of them is selected with priority (in the present embodiment, the higher power capacity is given priority).

  On the other hand, when there is an abnormality in the sub power supply designated as the alternative power supply 1 (when it is determined Yes in step ST4), the operation proceeds to step ST6, and the alternative power supply 2 is set in the current operation mode. It is confirmed by referring to the power supply selection correspondence table D. As a result, when the alternative power source 2 is not set (when it is determined No in step ST6), since no other alternative power source is prepared for the power source abnormality, the operation proceeds to step ST9. The power supply abnormality is displayed on the display unit 2 and the process is terminated.

  On the other hand, when the alternative power source 2 is set in the current operation mode (when determined Yes in step ST6), whether or not an abnormality has occurred in the sub power source designated as the alternative power source 2 is determined. Is determined (step ST7). As a result, when there is no abnormality in the sub power supply designated as the alternative power source 2 (when it is determined No in step ST7), it is determined that the alternative power source 2 is normal, and the sub power source is replaced with the alternative power source. 2 is selected (step ST8).

  On the other hand, when there is an abnormality in the sub power supply designated as the alternative power supply 2 (when determined Yes in step ST7), no other alternative power supply is prepared for the power supply abnormality, and therefore, step ST9. The operation is advanced to display the power supply abnormality on the display unit 2 and the process is terminated.

  As described above, in the power supply selection correspondence table D, the power capacity that is the upper limit value of the power that can be output is described in advance corresponding to each processing unit of the copy, printer, and scanner. Therefore, when a power supply abnormality occurs in any of the second to fourth sub power sources 222 to 224 of the control system and the sixth, seventh, and ninth sub power sources 226, 227, and 229 of the driving system, the power source is selected. By referring to the power capacity of the correspondence table D, a sub power source having a large power capacity may be selected preferentially. In this way, even at the time of alternative power supply, the ability of the processing unit driven by this alternative power supply can be maximized as much as possible.

  However, even if a sub power source having a large power capacity is selected, if the power capacity of the sub power source in which the power failure has occurred is larger than the power capacity of the selected sub power source, the processing unit driven by alternative power feeding Must be controlled so as to be within the range of power capacity that can be supplied by alternative power feeding. That is, it is necessary to reduce the image processing speed per unit time of the image forming process and the document reading process as compared with the normal operation.

  For example, as shown in FIG. 5, when the ninth sub power source 229 is used as the alternative power source 1 because an abnormality has occurred in the seventh sub power source 227 in the printer operation mode without post-processing, the seventh sub power source 227 is used. 150W, while the ninth sub power supply 229 is 100W, it is necessary to drive and control the operation of the printing unit 7a driven by the seventh sub power supply 227 within a power capacity range of 100W. (This is called "Case 1"). Similarly, when the sixth sub power source 226 is used as the alternative power source 2 in the printer operation mode without post-processing, an abnormality has occurred in the ninth sub power source 229 in addition to the seventh sub power source 227. Since the sub power source 227 is 150 W while the sixth sub power source 226 is 80 W, the operation of the printing unit 7 a driven by the sixth sub power source 226 is driven so as to be within the range of the power capacity of 80 W. It is necessary to control (this is called “Case 2”).

  Here, the case 1 and the case 2 will be specifically described in comparison with the case of normal operation. Both the case 1 and the case 2 are drive control of the print unit 7a which is an image forming unit. However, since the document conveyance path is almost the same in the case of the scanner unit 6a which is a document reading unit, here, Description of the document reading unit is omitted, and only the image forming unit will be described.

  FIG. 7 is an explanatory diagram schematically showing a configuration example of a paper transport path that forms the printing unit 7a.

  The sheet conveying path includes five rollers R1 to R5 (that is, a conveying roller R1 that also serves as a pickup roller and four rollers for conveying a sheet) on the sheet conveying path between the sheet feeding tray T1 and the sheet discharging tray T2. The conveying rollers R2 to R5) are arranged at a predetermined interval, and five sensors S1 to S5 for detecting paper are arranged between these rollers R1 to R5, respectively. Further, five motors M1 to M5, which are driving sources for driving the five rollers R1 to R5, are respectively arranged. FIG. 7 shows a configuration in which the roller rollers R1 to R5 and the sensor sensors S1 to S5 are arranged at substantially equal intervals in order to simplify the subsequent description.

<Description during normal operation>
Here, during normal operation, the amount of power of the seventh sub power source 227, which is the power source of the printing unit 7a, is set so that sufficient power can be supplied even when all of the five motors M1 to M5 are operated. . Accordingly, during normal operation, the four motors M2 to M5 that drive the transport rollers R2 to R5 are always in an ON state, and the transport rollers R2 to R5 are always in a rotationally driven state. In this state, by driving the motor M1 and operating the transport roller R1 that also serves as a pickup roller at a predetermined timing, the paper P is separated at a predetermined interval (a gap between adjacent papers of, for example, about 20 to 30 mm). The paper is fed continuously at intervals. FIG. 7 shows a sheet conveyance state during the normal operation. Even if the gaps between adjacent sheets P are thus narrowed and continuously fed to the sheet conveyance path, since all the conveyance rollers M2 to M5 are always driven to rotate, the sheet P on the sheet conveyance path is kept constant. Image formation is performed sequentially while maintaining the interval (conveyance pitch L1), and the images are sequentially conveyed to the discharge tray T2.

<Description for Case 1>
Here, assuming that the amount of power required when all of the five motors M1 to M5 are operating is 120 W, for example, in the case 1, the amount of power that can be supplied is 100 W. Such normal operation cannot be performed. In this case, if four motors are driven by simple calculation, 96 W of power is required. Therefore, based on the calculation result, the number of motors that can be driven in case 1 is up to four. . Therefore, in case 1, it is necessary to control the sheet conveyance so as to satisfy this condition.

  Hereinafter, the paper conveyance control in case 1 (when the maximum number of motors to be driven is four) will be described with reference to transition diagrams of the paper conveyance states shown in FIGS. 8A to 8C. In the transition diagrams shown in FIGS. 8A to 8C, the driving motor and roller are hatched.

  First, as shown in FIG. 8A (a), the motor M1 is driven to drive the transport roller R1 that also serves as a pickup roller, and the uppermost paper P1 placed on the paper feed tray T1 is moved to the paper transport path. Feed paper. The motor driven at this time is one of the motor M1.

  In this way, the sheet P1 is picked up and conveyed to the downstream side in the sheet conveying direction (left side in FIG. 8). As shown in FIG. 8A (b), when the leading edge reaches below the sensor S1, the sensor S1 Is detected, and a detection signal is transmitted to the print control unit 7. When receiving the detection signal, the print controller 7 starts driving the motor M2. Accordingly, the motors driven at this time are two motors M1 and M2.

  Thereafter, the sheet P1 is further conveyed downstream in the conveying direction by the conveying rollers R1 and R2, and as shown in FIG. 8A (c), when the leading edge comes below the sensor S2, the sensor S2 detects this, A detection signal is transmitted to the print control unit 7. When receiving the detection signal, the print controller 7 starts driving the motor M3. At this time, the rear end of the sheet P1 has not yet passed under the sensor S1. Accordingly, the motors driven at this time are three motors M1, M2 and M3.

  Thereafter, the sheet P1 is further transported downstream in the transport direction by the transport roller R2, and as shown in FIG. 8B (d), when the trailing edge passes under the sensor S1, the sensor S1 detects this, and the detection signal Is transmitted to the print control unit 7. When receiving the detection signal, the print control unit 7 stops driving the motor M1. At this time, the leading edge of the paper P1 has not yet come under the sensor S3. Therefore, the motors driven at this time are two motors M2 and M3.

  Thereafter, the sheet P1 is further conveyed downstream in the conveying direction by the conveying rollers R2 and R3, and as shown in FIG. 8B (e), when the leading edge comes below the sensor S3, the sensor S3 detects this, A detection signal is transmitted to the print control unit 7. When receiving the detection signal, the print controller 7 starts driving the motor M4. At this time, the rear end of the sheet P1 has not yet passed under the sensor S2. Therefore, the motors driven at this time are three motors M2, M3, and M4.

  Thereafter, the sheet P1 is further conveyed downstream in the conveying direction by the conveying roller R3, and as shown in FIG. 8B (f), when the trailing edge passes under the sensor S2, the sensor S2 detects this, and a detection signal Is transmitted to the print control unit 7. Upon receiving this detection signal, the print control unit 7 stops driving the motor M2, and at this time, drives the motor M1 to drive the transport roller R1 that also serves as a pickup roller, and places it on the paper feed tray T1. The uppermost (next) paper P2 is fed to the paper transport path. At this time, the leading edge of the paper P1 has not yet been lowered below the sensor S4. Accordingly, the motors driven at this time are three motors M1, M3, and M4.

  Thereafter, the paper P1 is further transported downstream in the transport direction by the transport roller R4, and the paper P2 is transported further downstream in the transport direction by the transport roller R1, and as shown in FIG. When the leading edge reaches below the sensor S4, the sensor S4 detects this and transmits a detection signal to the print control unit 7. When receiving the detection signal, the print controller 7 starts driving the motor M5. Accordingly, there are four motors M1, M3, M4, and M5 driven at this time, and the maximum four conditions are satisfied.

  Thereafter, the paper P1 is further transported downstream in the transport direction by the transport roller R4, and the paper P2 is transported further downstream in the transport direction by the transport roller R1, and as shown in FIG. When the trailing edge passes below the sensor S3 and the leading edge of the paper P2 reaches below the sensor S1, the sensors S1 and S3 detect this, and transmit respective detection signals to the print control unit 7. Upon receiving these detection signals, the print controller 7 stops driving the motor M3 and starts driving the motor M2. Accordingly, there are four motors M1, M2, M4, and M5 driven at this time, and the maximum four conditions are satisfied.

  Thereafter, the paper P1 is further transported downstream in the transport direction by the transport roller R5, and the paper P2 is transported further downstream in the transport direction by the transport roller R2, as shown in FIG. 8C (i). When the trailing edge passes under the sensor S4 and the leading edge of the paper P2 comes under the sensor S2, the sensors S2 and S4 detect this and transmit respective detection signals to the print controller 7. Upon receiving these detection signals, the print controller 7 stops driving the motor M4 and starts driving the motor M3. At this time, the rear end of the paper P2 has not yet passed under the sensor S1. Accordingly, there are four motors M1, M2, M3, and M5 driven at this time, and the maximum four conditions are satisfied.

  Thereafter, the paper P1 is further transported downstream in the transport direction by the transport roller R5, and the paper P2 is transported further downstream in the transport direction by the transport roller R3. As shown in FIG. When the trailing edge passes below the sensor S5 and the leading edge of the paper P2 reaches below the sensor S3, the sensors S3 and S4 detect this and transmit respective detection signals to the print controller 7. Upon receiving these detection signals, the print control unit 7 stops driving the motor M5 and starts driving the motor M4. At this time, the rear end of the sheet P2 has not yet passed under the sensor S2. Therefore, the motors driven at this time are three motors M2, M3, and M4.

  In case 1, the conveyance control is as described above. Therefore, the transport pitch of the paper P is L11 as shown in FIG. 8C (g), which is longer than the transport pitch L1 during the normal operation shown in FIG. That is, in the case 1, the sheet pitch per unit time is controlled to be smaller than that in the normal operation by increasing the conveyance pitch L11 in this way.

  FIG. 9 is a flowchart illustrating a processing procedure executed by the print control unit 7 in order to perform the above-described conveyance control. Hereinafter, the sheet conveyance control described with reference to FIGS. 8A to 8C will be described again with reference to the flowchart shown in FIG.

  First, the motor M1 is driven to drive the transport roller R1 that also serves as a pickup roller (step ST11), and the uppermost paper P1 placed on the paper feed tray T1 is fed to the paper transport path. This state is shown in FIG. 8A (a).

  Then, “1” is substituted for the variable n (step ST12), and it is monitored whether or not the first sensor S1 has changed from OFF to ON (step ST13). As a result, when the sensor S1 changes from OFF to ON (when determined Yes in step ST13), the rotation of the motor M2 that drives the transport roller R2 disposed on the downstream side in the transport direction of the sensor S1. Is started (step ST14). This state is shown in FIG. 8A (b).

  Thereafter, the variable n is incremented to n = 2 (step ST15), and in the next step ST16, it is determined whether n is larger than 2 (n> 2). In this case, since n = 2, the determination in step ST16 is No, and the process returns to step ST13.

  In step ST13, it is monitored whether or not the second sensor S2 has changed from OFF to ON. As a result, when the sensor S2 changes from OFF to ON (when determined Yes in step ST13), the rotation of the motor M3 that drives the transport roller R3 disposed on the downstream side of the sensor S2 in the transport direction. Is started (step ST14). This state is shown in FIG. 8A (c).

  Thereafter, the variable n is incremented to n = 3 (step ST15), and it is determined in the next step ST16 whether n is larger than 2. In this case, n = 3 and is larger than 2, so the determination in step ST16 is Yes and the process proceeds to step ST17. In step ST17, it is determined whether or not the variable n is larger than 4 (n> 4). In this case, since n = 3, the determination in step ST17 is No, and the process proceeds to step ST18. In step ST18, since the sensor S (n-2), that is, n = 3 in this case, the sensor S1 is monitored whether it has changed from ON to OFF. As a result, when the sensor S1 remains in the ON state (when it is determined No in step ST18), the process returns to step ST13, and the monitoring of the sensor S3 and the monitoring of the sensor S1 in step ST18 are continued. Will do. This state is also shown in FIG. 8A (c).

  Thereafter, when the sensor S1 changes from ON to OFF in Step ST18 (when it is determined Yes in Step ST18), since the motor M (n−2), that is, n = 3, the motor M1 is stopped ( Step ST19). This state is shown in FIG. 8B (d).

  Thereafter, it is determined whether or not the sensor S2 has changed from ON to OFF, that is, whether or not the sensor that has changed from ON to OFF in step ST18 is the sensor S2 (step ST20). If it is determined No in ST20), the process returns to step ST13, and the processes in steps ST13 to ST20 are repeated.

  In step ST13, when the sensor S3 changes from OFF to ON (when it is determined Yes in step ST13), the motor that drives the transport roller R4 disposed on the downstream side in the transport direction of the sensor S3. The rotation of M4 is started (step ST14). This state is shown in FIG.

  Thereafter, the variable n is incremented to n = 4 (step ST15), and in the next step ST16, it is determined whether or not n is larger than 2 (n> 2). In this case, n = 4 and is larger than 2, so the determination in step ST16 is Yes and the process proceeds to step ST17. In step ST17, it is determined whether or not the variable n is larger than 4 (n> 4). In this case, since n = 4, the determination in step ST17 is No, and the process proceeds to step ST18. In step ST18, since sensor S (n-2), that is, n = 4 in this case, sensor S2 is monitored whether it has changed from ON to OFF. As a result, when the sensor S2 remains in the ON state (when it is determined No in step ST18), the process returns to step ST13, and the monitoring of the sensor S4 and the monitoring of the sensor S2 in step ST18 are continued. Will do. This state is also shown in FIG. 8B (e).

  Thereafter, when the sensor S2 is changed from ON to OFF in Step ST18 (when it is determined Yes in Step ST18), since the motor M (n−2), that is, n = 4, the motor M2 is stopped ( Step ST19). This state is the left part of FIG. 8B (f).

  Thereafter, it is determined whether or not the sensor S2 has changed from ON to OFF, that is, whether or not the sensor that has changed from ON to OFF in step ST18 is the sensor S2 (step ST20). In this case, since the sensor S2 has changed (it is determined Yes in step ST20), the process proceeds to step ST21, and it is determined whether or not all sheets of one job currently being executed have been fed. . As a result, if the total number of sheets has not been fed (if NO is determined in step ST21), there is a sheet to be transported next (that is, a job to be subjected to image processing). Is started (step ST22), and the process returns to step ST13. That is, in the parallel processing of this processing operation 1, the motor M1 is driven to drive the transport roller R1 that also serves as the pickup roller (step ST11), and the uppermost (next) placed on the paper feed tray T1. The paper P2 is fed to the paper transport path. This state is shown in FIG. 8B (f). Note that the description of the parallel processing of processing operation 1 started at this point will be omitted in the following description, and only the result will be shown.

  Thereafter, the processing of step ST13 to step ST20 is repeated, and in step ST13, when the sensor S4 changes from OFF to ON (when it is determined Yes in step ST13), the sensor S4 is moved downstream in the transport direction. The rotation of the motor M5 that drives the arranged transport roller R5 is started (step ST14). This state is shown in FIG. 8C (g).

  Thereafter, the variable n is incremented to n = 5 (step ST15), and in the next step ST16, it is determined whether or not n is larger than 2 (n> 2). In this case, n = 5 and is larger than 2, so the determination in step ST16 is Yes and the process proceeds to step ST17. In step ST17, it is determined whether or not the variable n is larger than 4 (n> 4). In this case, since n = 5, the determination in step ST17 is Yes, and the process proceeds to step ST23. In step ST23, it is monitored whether the sensor S3 has changed from ON to OFF. As a result, when the sensor S3 changes from ON to OFF (when determined Yes in step ST23), the motor M3 is stopped (step ST24). At this time, the sensor S1 is changed from OFF to ON by the parallel processing of the processing operation 1, and the motor M2 starts to rotate. This state is shown in FIG. 8C (h).

  Thereafter, in the next step ST25, it is monitored whether or not the sensor S4 has changed from ON to OFF. As a result, when the sensor S4 changes from ON to OFF (when determined Yes in step ST25), the motor M4 is stopped (step ST26). At this time, the sensor S2 is changed from OFF to ON by the parallel processing of the processing operation 1, and the motor M3 starts to rotate. This state is shown in FIG. 8C (i).

  Thereafter, in the next step ST27, it is monitored whether or not the sensor S5 has changed from ON to OFF. As a result, when the sensor S5 changes from ON to OFF (when determined Yes in step ST27), the motor M5 is stopped (step ST28). At this time, the sensor S3 is changed from OFF to ON by the parallel processing of the processing operation 1, and the motor M4 starts to rotate. This state is shown in FIG. 8C (j).

  If the paper P1 transported to the paper discharge tray T2 is the last paper of one job by the processing of step ST28, the following as shown in FIGS. 8B (f) to 8C (j). Since the sheet P2 is not conveyed, the processing of one job is completed at this point.

  In the above description, for the sake of convenience, for example, in the description of FIG. 8C (h), the timing at which the trailing edge of the sheet P1 passes below the sensor S3 is the same as the timing at which the leading edge of the sheet P2 comes below the sensor S1. Although described as the timing, when the leading edge of the sheet P2 comes first below the sensor S1, the motor M2 is not driven at that point in time to satisfy the maximum four conditions, and the sheet P2 is driven by the motor M1. The conveyance is continued only by the driving conveyance roller R1. Then, when the rear end of the sheet P1 passes below the sensor S3, the driving of the motor M2 may be started. In this case, if the leading end of the sheet P2 is just before the transport roller R2, but the trailing end of the sheet P1 has not yet passed under the sensor S3, the driving of the motor M1 is stopped and the trailing end of the sheet P1. The paper P2 may be waited at that position until the end passes through the sensor S3. Note that such timing control is the same in case 2 described below.

<Explanation for Case 2>
As described above, assuming that the amount of power required when all of the five motors M1 to M5 are operating is 120 W, for example, in the case 2, the amount of power that can be supplied is 80 W. Therefore, such normal operation cannot be performed. In this case, if three motors are driven by simple calculation, 72 W of power is required. Therefore, based on this calculation result, the maximum number of motors that can be driven in case 2 is three. . Therefore, in case 2, it is necessary to control the sheet conveyance so as to satisfy this condition.

  Hereinafter, the sheet conveyance control in case 2 (when the number of motors to be driven is a maximum of three) will be described with reference to the sheet conveyance state transition diagrams shown in FIGS. 10A to 10C. In the transition diagrams shown in FIGS. 10A to 10C, the driving motor and roller are hatched.

  First, as shown in FIG. 10A (a), the motor M1 is driven to drive the transport roller R1 that also serves as a pickup roller, and the uppermost paper P1 placed on the paper feed tray T1 is moved to the paper transport path. Feed paper. The motor driven at this time is one of the motor M1.

  In this way, the paper P1 is picked up and transported downstream in the paper transport direction (left side in FIG. 10). As shown in FIG. 10A (b), when the leading edge comes below the sensor S1, the sensor S1 Is detected, and a detection signal is transmitted to the print control unit 7. When receiving the detection signal, the print controller 7 starts driving the motor M2. Accordingly, the motors driven at this time are two motors M1 and M2.

  Thereafter, the sheet P1 is further conveyed downstream in the conveying direction by the conveying rollers R1 and R2, and as shown in FIG. 10A (c), when the leading edge comes below the sensor S2, the sensor S2 detects this, A detection signal is transmitted to the print control unit 7. When receiving the detection signal, the print controller 7 starts driving the motor M3. At this time, the rear end of the sheet P1 has not yet passed under the sensor S1. Accordingly, the motors driven at this time are three motors M1, M2 and M3.

  Thereafter, the sheet P1 is further conveyed downstream in the conveying direction by the conveying roller R2, and as shown in FIG. 10B (d), when the trailing edge passes below the sensor S1, the sensor S1 detects this, and a detection signal Is transmitted to the print control unit 7. When receiving the detection signal, the print control unit 7 stops driving the motor M1. At this time, the leading edge of the paper P1 has not yet come under the sensor S3. Therefore, the motors driven at this time are two motors M2 and M3.

  Thereafter, the sheet P1 is further transported downstream in the transport direction by the transport rollers R2 and R3, and as shown in FIG. 10B (e), when the leading edge comes below the sensor S3, the sensor S3 detects this, A detection signal is transmitted to the print control unit 7. When receiving the detection signal, the print controller 7 starts driving the motor M4. At this time, the rear end of the sheet P1 has not yet passed under the sensor S2. Therefore, the motors driven at this time are three motors M2, M3, and M4.

  Thereafter, the sheet P1 is further transported downstream in the transport direction by the transport roller R3, and as shown in FIG. 10B (f), when the trailing edge passes under the sensor S2, the sensor S2 detects this, and the detection signal Is transmitted to the print control unit 7. When receiving the detection signal, the print controller 7 stops driving the motor M2. At this time, the leading edge of the paper P1 has not yet been lowered below the sensor S4. Accordingly, the motors driven at this time are two motors M3 and M4.

  Thereafter, the sheet P1 is further conveyed downstream in the conveying direction by the conveying roller R4, and as shown in FIG. 10C (g), when the leading end of the sheet P1 comes under the sensor S4, the sensor S4 detects this, A detection signal is transmitted to the print control unit 7. When receiving the detection signal, the print controller 7 starts driving the motor M5. Accordingly, the motors driven at this time are three motors M3, M4, and M5.

  Thereafter, the sheet P1 is further conveyed downstream in the conveying direction by the conveying roller R4, and when the rear end of the sheet P1 passes under the sensor S3 as shown in FIG. 10C (h), the sensor S3 detects this. The detection signal is transmitted to the print control unit 7. Upon receiving this detection signal, the print controller 7 stops driving the motor M3, and at this time, drives the motor M1 to drive the transport roller R1 that also serves as a pickup roller, and places it on the paper feed tray T1. The uppermost (next) paper P2 is fed to the paper transport path. Therefore, the motors driven at this time are three motors M1, M4, and M5.

  Thereafter, the paper P1 is further transported downstream in the transport direction by the transport roller R5, and the paper P2 is transported further downstream in the transport direction by the transport roller R1, and as shown in FIG. When the trailing edge passes under the sensor S4 and the leading edge of the paper P2 reaches below the sensor S1, the sensors S1 and S4 detect this and transmit respective detection signals to the print control unit 7. Upon receiving these detection signals, the print controller 7 stops driving the motor M4 and starts driving the motor M2. Accordingly, the motors driven at this time are three motors M1, M2 and M5.

  Thereafter, the paper P1 is further transported downstream in the transport direction by the transport roller R5, and the paper P2 is transported further downstream in the transport direction by the transport roller R2, as shown in FIG. 10C (j). When the trailing edge passes below the sensor S5 and the leading edge of the paper P2 reaches below the sensor S2, the sensors S2 and S4 detect this and transmit respective detection signals to the print controller 7. Upon receiving these detection signals, the print controller 7 stops driving the motor M5 and starts driving the motor M3. At this time, the rear end of the paper P2 has not yet passed under the sensor S1. Accordingly, the motors driven at this time are three motors M1, M2 and M3.

  In the case 2, the conveyance control is as described above. Accordingly, the conveyance pitch of the paper P is L12 as shown in FIG. 10C (h), which is the conveyance pitch L1 during normal operation shown in FIG. 7 and the conveyance in the case 1 shown in FIG. 8C (g). It is longer than the pitch L11. That is, in the case 2, by further increasing the conveyance pitch L12 in this way, the number of image formations per unit time is controlled to be smaller than that in the normal operation.

  FIG. 11 is a flowchart illustrating a processing procedure executed by the print control unit 7 in order to perform the above-described conveyance control. Hereinafter, the sheet conveyance control described with reference to FIGS. 10A to 10C will be described again with reference to the flowchart shown in FIG.

  First, the motor M1 is driven to drive the transport roller R1 that also serves as a pickup roller (step ST31), and the uppermost paper P1 placed on the paper feed tray T1 is fed to the paper transport path. This state is shown in FIG. 10A (a).

  Then, “1” is substituted for the variable n (step ST32), and it is monitored whether or not the first sensor S1 has changed from OFF to ON (step ST33). As a result, when the sensor S1 changes from OFF to ON (when it is determined YES in step ST33), the rotation of the motor M2 that drives the transport roller R2 disposed on the downstream side in the transport direction of the sensor S1. Is started (step ST34). This state is shown in FIG. 10A (b).

  Thereafter, the variable n is incremented to n = 2 (step ST35), and in the next step ST36, it is determined whether or not n is larger than 2 (n> 2). In this case, since n = 2, the determination in step ST36 is No, and the process returns to step ST33.

  In step ST33, it is monitored whether or not the second sensor S2 has changed from OFF to ON. As a result, when the sensor S2 changes from OFF to ON (when it is determined YES in step ST33), the rotation of the motor M3 that drives the transport roller R3 disposed downstream in the transport direction of the sensor S2 Is started (step ST34). This state is shown in FIG. 10A (c).

  Thereafter, the variable n is incremented to n = 3 (step ST35), and it is determined in the next step ST36 whether n is larger than 2. In this case, n = 3 and is larger than 2, so the determination in step ST36 is Yes and the process proceeds to step ST37. In step ST37, it is determined whether or not the variable n is larger than 4 (n> 4). In this case, since n = 3, the determination in step ST37 is No, and the process proceeds to step ST38. In step ST38, since sensor S (n-2), that is, in this case, n = 3, it is monitored whether sensor S1 has changed from ON to OFF. As a result, when the sensor S1 remains in the ON state (when it is determined No in step ST38), the process returns to step ST33, and the monitoring of the sensor S3 and the monitoring of the sensor S1 in step ST38 are continued. Will do. This state is also shown in FIG. 10A (c).

  Thereafter, when the sensor S1 changes from ON to OFF in Step ST38 (when it is determined Yes in Step ST38), since the motor M (n−2), that is, n = 3, the motor M1 is stopped ( Step ST39). This state is shown in FIG.

  Then, it returns to step ST33 and repeats the process of step ST33-step ST19. In step ST33, when the sensor S3 changes from OFF to ON (when it is determined Yes in step ST33), the motor that drives the transport roller R4 disposed on the downstream side in the transport direction of the sensor S3. The rotation of M4 is started (step ST34). This state is shown in FIG.

  Thereafter, the variable n is incremented to n = 4 (step ST35), and in the next step ST36, it is determined whether or not n is larger than 2 (n> 2). In this case, n = 4 and is larger than 2, so the determination in step ST36 is Yes and the process proceeds to step ST37. In step ST37, it is determined whether or not the variable n is larger than 4 (n> 4). In this case, since n = 4, the determination in step ST37 is No, and the process proceeds to step ST38. In step ST38, since sensor S (n-2), that is, n = 4 in this case, sensor S2 is monitored whether it has changed from ON to OFF. As a result, when the sensor S2 remains in the ON state (when No is determined in step ST38), the process returns to step ST33, and the monitoring of the sensor S4 and the monitoring of the sensor S2 in step ST38 are continued. Will do. This state is also shown in FIG. 10B (e).

  Thereafter, when the sensor S2 is changed from ON to OFF in Step ST38 (when it is determined Yes in Step ST38), since the motor M (n−2), that is, n = 4, the motor M2 is stopped ( Step ST39). This state is shown in FIG.

  Then, it returns to step ST33 and repeats the process of step ST33-step ST20. In step ST33, when the sensor S4 changes from OFF to ON (when it is determined YES in step ST33), the motor that drives the transport roller R5 disposed on the downstream side of the sensor S4 in the transport direction. The rotation of M5 is started (step ST34). This state is shown in FIG. 10C (g).

  Thereafter, the variable n is incremented to n = 5 (step ST35), and in the next step ST36, it is determined whether or not n is larger than 2 (n> 2). In this case, since n = 5 and is larger than 2, the determination in step ST36 is Yes, and the process proceeds to step ST37. In step ST37, it is determined whether or not the variable n is larger than 4 (n> 4). In this case, since n = 5, the determination in step ST37 is Yes, and the process proceeds to step ST40. In step ST40, it is monitored whether or not the sensor S3 has changed from ON to OFF. As a result, when the sensor S3 changes from ON to OFF (when determined Yes in step ST40), the motor M3 is stopped (step ST41).

  In the next step ST42, it is determined whether or not all sheets of one job currently being executed have been fed. As a result, if the total number of sheets has not been fed (if NO is determined in step ST42), there is a sheet to be transported next (that is, a job to be subjected to image processing). Is started (step ST43). That is, in the parallel processing of this processing operation 2, the motor M1 is driven to drive the transport roller R1 that also serves as a pickup roller (step ST31), and the uppermost (next) placed on the paper feed tray T1. The paper P2 is fed to the paper transport path. This state is shown in FIG. 10B (h). Note that the description of the parallel processing of the processing operation 2 started at this point will be omitted in the following description, and only the result will be shown.

  Thereafter, in the next step ST44, it is monitored whether or not the sensor S4 has changed from ON to OFF. As a result, when the sensor S4 changes from ON to OFF (when determined Yes in step ST44), the motor M4 is stopped (step ST45). At this time, the sensor S1 is changed from OFF to ON by the parallel processing of the processing operation 2, and the motor M2 starts to rotate. This state is shown in FIG. 10C (i).

  Thereafter, in the next step ST46, it is monitored whether or not the sensor S5 has changed from ON to OFF. As a result, when the sensor S5 changes from ON to OFF (when determined Yes in step ST46), the motor M5 is stopped (step ST47). At this time, the sensor S2 is changed from OFF to ON by the parallel processing of the processing operation 2, and the motor M3 starts to rotate. This state is shown in FIG. 10C (j).

  If the paper P1 transported to the paper discharge tray T2 is the last paper of one job by the processing in step ST47, the following as shown in FIGS. 10B (h) to 10C (j). Since the sheet P2 is not conveyed, the processing of one job is completed at this point.

  In the present embodiment, the description of the case 1 and the case 2 is applied to drive control of the print unit 7a which is an image forming unit, but is applied to drive control of the scanner unit 6a which is a document reading unit. Even if applied, the same control is obtained. In other words, when applied to the drive control of the scanner unit 6a, the configuration of the paper conveyance path shown in FIG. 7 is the configuration of the original conveyance path, and the paper detection sensors S1 to S5 are only the original detection sensors. It is.

  In this embodiment, the second to fourth sub power sources 222 to 224 of the control system are paired with the scanner control unit, the print control unit 7 and the post-processing control unit 8 of the control system, respectively. The sixth, seventh, and ninth sub power sources 226, 227, and 229 are paired with the scanner unit 6a, the print unit 7a, and the shifters 8a to 8c of the driving system, respectively. That is, a dedicated sub power source is assigned to each control system and each drive system. However, the present invention is not limited to such assignment, and it may be configured such that the setting of the sub power supply assigned to each control system and each drive system can be changed.

  The gist of the present invention is provided with at least the same number of power supplies as each processing unit, and on the assumption that power is individually assigned to each processing unit, if any power supply has an abnormality, A power supply for a processing unit that is not used in the operation mode when the abnormality occurs is used as an alternative power supply. Therefore, even when the configuration of the sub power supply assigned to each control system and each drive system can be changed, it is only necessary that power is individually assigned to each processing unit before and after the setting change.

1 is a block diagram of an image processing apparatus X according to an embodiment of the present invention. 1 is a power system diagram of an image processing apparatus X according to an embodiment of the present invention. It is an electric circuit diagram of a power supply relay part. 6 is a chart showing, in a list format, sub power sources that are turned on in accordance with various operation modes in the image processing apparatus X during normal driving. It is explanatory drawing which shows the power supply selection corresponding table when selecting an alternative power supply at the time of power supply abnormality generation | occurrence | production. It is a flowchart for demonstrating the selection process of the alternative power supply at the time of the power supply abnormality using the power supply selection corresponding table. FIG. 6 is a diagram schematically illustrating a sheet conveyance path of a printing unit that is an image forming unit. FIG. 10 is a transition diagram illustrating a state of sheet conveyance control in case 1 (when driving up to four motors). FIG. 10 is a transition diagram illustrating a state of sheet conveyance control in case 1 (when driving up to four motors). FIG. 10 is a transition diagram illustrating a state of sheet conveyance control in case 1 (when driving up to four motors). 10 is a flowchart illustrating a processing operation of sheet conveyance control in case 1 (when driving a maximum of four motors). FIG. 10 is a transition diagram illustrating a state of sheet conveyance control in case 2 (when driving a maximum of three motors). FIG. 10 is a transition diagram illustrating a state of sheet conveyance control in case 2 (when driving a maximum of three motors). FIG. 10 is a transition diagram illustrating a state of sheet conveyance control in case 2 (when driving a maximum of three motors). 10 is a flowchart showing a processing operation of paper conveyance control in case 2 (when a maximum of three motors are driven).

Explanation of symbols

1 to 5, 6, 6a, 6b, 7, 7a, 7b, 8, 8a to 8c, 9, 10 Processing unit 6, 6a, 6b Document reading unit (scanner unit)
7, 7a, 7b Image forming part (printing part)
8, 8a, 8b, 8c Post-processing section (shifter, puncher, stapler)
61 power supply abnormality detection means 62 power supply switching means 63 power supply selection means 64 operation mode designation means 21 power supply (main power supply)
221 to 229 Power supply (sub power supply)
222, 223, 224 Control system power supply (second to fourth sub power supplies)
226, 227, 229 Drive system power supply (sixth, seventh, ninth sub-power supply)
6, 7, 8 Control system (control unit)
6a, 7a, 8a-8c Drive system (drive unit)
M1 to M5 Drive source (motor)
S1 to S5 Paper detection means (sensor)
D Power supply selection correspondence table X Image processing device P Paper

Claims (14)

Operation mode designating means for designating various operation modes;
A plurality of power supplies for supplying power;
A plurality of processing units that individually operate using any one of the plurality of power supplies as a power source; and
A power supply abnormality detecting means for detecting each abnormality of the plurality of power supplies;
While an arbitrary operation mode is specified by the operation mode specifying means and the power supply abnormality detecting means detects an abnormality of an arbitrary power supply, it is not used as a power source for the operation mode being executed. An image processing apparatus comprising: an energization control unit that selects a power source for the power source and supplies the power source in which the abnormality is detected as a power source for replacement to the processing unit.   The image processing apparatus according to claim 1, wherein the plurality of processing units are a document reading unit, an image forming unit, and a post-processing unit that performs post-processing on a sheet on which an image is formed. The plurality of power sources are a plurality of drive system power sources serving as power sources for the document reading unit, the image forming unit, and the post-processing unit, and the document reading unit, the image forming unit, and It comprises a plurality of control system power supplies serving as power sources to the respective control units of the post-processing unit,
When the power supply abnormality detection unit detects an abnormality in the drive system power supply, the energization control unit selects another drive system power supply that is not used as a power source for the operation mode being executed, and the abnormality Is supplied as an alternative power source for the processing unit whose power source is the detected drive system power supply, while the power supply abnormality detection means detects an abnormality in the control system power supply, A control system power supply that is not used as a mode power source is selected, and the control system power supply in which the abnormality is detected is supplied to the processing unit as a power source as an alternative power source. Item 3. The image processing apparatus according to Item 2. In the case of supplying as an alternative power source, image processing control means for controlling the image processing speed of the document reading unit and / or the image forming unit so as to be lower than that during normal operation is provided. the image processing apparatus according to claim 2 or claim 3, characterized in that.   The image processing apparatus according to claim 4, wherein the image processing control unit controls the number of images formed per unit time of the image forming unit to be smaller than that during normal operation.   The image processing apparatus according to claim 4, wherein the image processing control unit controls the number of images read per unit time of the document reading unit to be smaller than that during normal operation. The document reading unit
A document transport path for transporting a document, a plurality of drive sources for transporting the document disposed at a predetermined interval in the document transport path, and the document disposed at a predetermined interval in the document transport path A plurality of document detection means for detecting the passage of
When the document detection unit detects the passage of the leading edge of the document, the image processing control unit drives the nearest drive source located downstream in the document transport direction with respect to the document detection unit that has detected the passage. The image processing apparatus according to claim 4. The image forming unit includes:
A paper transport path for transporting paper; a plurality of drive sources for transporting the paper disposed at a predetermined interval in the paper transport path; and the paper disposed at a predetermined interval in the paper transport path A plurality of paper detection means for detecting the passage of paper,
When the paper detection means detects the passage of the leading edge of the paper, the image processing control means drives the nearest drive source located downstream in the paper transport direction with respect to the paper detection means that has detected the passage. The image processing apparatus according to claim 4. The document reading unit
A document transport path for transporting a document, a plurality of drive sources for transporting the document disposed at a predetermined interval in the document transport path, and the document disposed at a predetermined interval in the document transport path A plurality of document detection means for detecting the passage of
When the document detection unit detects the passage of the trailing edge of the document, the image processing control unit stops driving a drive source located upstream in the document transport direction with respect to the document detection unit that has detected the passage. The image processing apparatus according to claim 4. The image forming unit includes:
A paper transport path for transporting paper; a plurality of drive sources for transporting the paper disposed at a predetermined interval in the paper transport path; and the paper disposed at a predetermined interval in the paper transport path A plurality of paper detection means for detecting the passage of paper,
When the paper detection means detects the passage of the trailing edge of the paper, the image processing control means stops driving the drive source located upstream in the paper conveyance direction with respect to the paper detection means that has detected the passage. The image processing apparatus according to claim 4. The power supply used corresponding to each operation mode is associated in advance, and the power supply that is not used in each operation mode is associated in advance as an alternative power supply in the operation mode. With a table
The image processing apparatus according to claim 3, wherein the energization control unit selects an alternative power source using the power source selection correspondence table. The power selection correspondence table stores a power capacity that is a power upper limit value of the processing unit corresponding to each power source,
The energization control unit refers to the stored power capacity and preferentially selects a power supply having a large power capacity when selecting a power supply for replacement using the power supply selection correspondence table. The image processing apparatus according to claim 11, wherein   The energization control means is a drive that drives simultaneously among the drive sources included in the processing unit that is driven by the substitute power source based on the power capacity of the substitute power source selected using the power source selection correspondence table. The image processing apparatus according to claim 12, wherein the number of sources is determined. An operation mode designating unit for designating various operation modes, a plurality of power supplies for supplying power, a plurality of processing units that individually operate using any one of the plurality of power supplies as a power source, and a plurality of power supplies An energization control method for an image processing apparatus, comprising: a power supply abnormality detection unit that detects each abnormality; and an energization control unit that performs energization control of the plurality of power supplies,
The energization control means is executed when an arbitrary operation mode is designated by the operation mode designation means and an abnormality is detected by the power supply abnormality detection means and when an abnormality is detected. A step of selecting another power source that is not used as a power source in the operation mode of the medium, and using the selected other power source as a power source for replacing the processing unit that uses the power source in which the abnormality is detected as a power source. And a step of supplying.

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