JP2006270304A - Image processing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent automatic informing of faults in a communication by the difference of the falling property of a power source in an apparatus when a main SW turns off. <P>SOLUTION: An image processing apparatus equipped with an AC/DC conversion means 540 for converting an AC voltage supplied through a main switch into a DC voltage, DC power supply apparatuses 514 and 530 each for adjusting the dc voltage to a set voltage, and control means 510 and 501 for which the electric power is supplied from this dc power supply apparatus and which performs the control of image processing, includes an AC cutting detection means 541, which detects the rejection of the ac voltage to the above AC/DC conversion means before the output voltage of the above DC power supply apparatus falls off under to the operation voltage of the above control means by the off of the above main switch. The control means 501 generates communication fault information only when the above AC cutting detection means 541 detects those with an AC voltage supply, and generates fault transmission information when the fault transmission between the control means by means of communications is detected. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image processing apparatus including a DC power supply device that is supplied with an AC power supply and outputs a DC voltage of a predetermined voltage, and a control device that operates with the DC voltage, and more particularly, from a plurality of DC power supply devices and each DC power supply device. The present invention relates to an image processing system including a plurality of control devices to be fed. The present invention can be used, for example, in a network printer, a network scanner, a copying machine, a facsimile machine, and a multifunction copying machine having an external communication function.

JP-A-4-318564 JP 2000-31268 A Japanese Patent Application Laid-Open No. 2001-22233.

  Patent Document 1 includes a copy control unit that controls a copy operation, a communication control unit that performs communication control with a communication line, and a communication failure detection unit that detects a malfunction of the communication control unit itself. A copying apparatus is described in which a warning display means displays a warning when the means detects that the function of the communication control means itself is defective.

  Patent Document 2 discloses a power-on reset for the purpose of a stable operation of a power system load in a non-control state of a control unit when a control system power supply is lowered when an AC is interrupted, in particular, a sequence of a control system DC power supply and a power system DC power supply In response to the signal, the CPU sends a reset signal to the peripheral device to determine the bus state to the peripheral device and reliably reset the peripheral device, and then turn on the control power to the peripheral device to turn on the peripheral control device. An image forming apparatus for initializing is described.

  Patent Document 3 discloses a facsimile apparatus that generates a reset signal at the rising edge of 3.3V when the power switch is turned on, masks 24V, releases the reset after a predetermined time, and simultaneously cancels the mask of 24V. Are listed.

  Conventionally, communication between a plurality of control means in a device is performed, and when a communication failure occurs, it is recognized as a malfunction in the device, stored in a nonvolatile storage device in the control means, displayed on a display device, or externally It reports to a remote diagnosis device. However, although the control power supply is generated in the apparatus, the falling slope of each power supply is different when the main SW is turned off. Therefore, between the control unit using a power supply with a fast fall and the control unit using a power supply with a slow fall, the control unit using a power supply with a fast fall naturally becomes uncontrollable, resulting in communication failure. generate.

  As a result, the control unit that has not yet fallen down may cause storage of communication failure information or report to a remote diagnosis. An object of the present invention is to prevent automatic notification of communication abnormality due to a difference in falling characteristics of a power supply in the apparatus when a main SW is turned off.

(1) AC / DC converting means (540) for converting an AC voltage fed through the main switch into a DC voltage; a DC power supply device (514, 530) for adjusting the DC voltage to a set voltage; and the DC power supply device In an image processing apparatus comprising control means (510, 501) for controlling image processing that is fed from
AC interruption detection means (541) for detecting interruption of the AC voltage to the AC / DC conversion means before the output voltage of the DC power supply device drops below the operating voltage of the control means by turning off the main switch; An image processing apparatus (MF1).

  In addition, in order to make an understanding easy, the code | symbol of the corresponding element or the corresponding matter of the Example which is shown in drawing and mentions later in a parenthesis was added as an example for reference. The same applies to the following.

  Before the output voltage of the DC power supply device drops below the operating voltage of the control means by turning off the main switch, the AC cutoff detection means (541) detects the cutoff of the AC voltage. Before the operating voltage disappears due to turning off, it is possible to recognize that the main switch is turned off and finish the control normally. For example, even if another control means or an electric circuit becomes unresponsive due to the main switch being turned off, it can be avoided that it is erroneously reported as abnormal.

  (2) The DC power supply device is plural (514, 530); the control means is also plural (510, 501) fed from each DC power supply device; and the image processing apparatus further performs communication between the control means. Means (PCI); the control means (501), when detecting a communication failure between the control means by the communication means, only when the AC interruption detection means (541) detects the presence of AC voltage application The image processing apparatus (MF1) according to (1), wherein communication failure information is generated.

  In addition to being able to give a reliable warning when communication failure occurs between control means, it is possible to determine unnecessary communication failure by monitoring the AC conduction state for the voltage drop of the power supply due to the main switch being turned off. Unnecessary failure warning, downtime, and associated repair work of the presser machine are suppressed.

  (3) The image processing apparatus according to (2), further including display means (502) for displaying the communication failure information.

  (4) The image processing apparatus according to (2) or (3), wherein the control unit (501) writes the communication failure information in a nonvolatile memory (NV-RAM);

  (5) The image processing according to any one of (2) to (4), wherein the control unit (501) notifies the remote management apparatus of the communication failure information by communication (504, 522) to the outside. apparatus.

  (6) The image processing apparatus includes an image forming means (200) for forming an image on a sheet; one of the control means is an engine control means (510) for controlling image formation by the image forming means. Another control means is system control means (501) for exchanging document information by communication with the outside; The image processing apparatus according to any one of (1) to (5) above.

  (7) Further, it includes a document scanner (120, 300) for reading a document image and generating image data representing the image; the engine control means (510) reads the document image of the document scanner and performs the operation based on the read image data. The image processing apparatus according to (6), which controls image formation by the image unit (200) and sending of read image data to the system control unit (501).

(8) A plurality of control means (510, 501) for controlling the image forming apparatus, a communication means (PCI) for performing communication between the control means, a detection means (501) for detecting a communication failure, defect information of the apparatus, etc. Communication means (504, 522) with an external remote diagnosis device for reporting, and an image forming apparatus provided with a warning display means (501, 502),
An image forming apparatus characterized in that when AC is cut off by turning off the main SW, AC cut is detected before the DC control voltage is lowered (541).

  (9) When the warning display means (501, 502) detects a communication failure between the control means (510/501), the warning display means (501, 502) monitors the energization state of the AC, and detects the communication failure between the plurality of CPUs (510, 501). The image forming apparatus as described in (8) above, wherein it is determined whether or not it is due to interruption, and a warning is displayed immediately when there is no problem with the AC supply.

  (10) The warning display means (501, 502) does not display a warning when detecting a communication failure between the control means (510/501) and detecting AC interruption (1) ) Image forming apparatus.

  (11) When a communication failure between the control means (510/501) is detected and AC interruption is detected, a non-volatile memory provided in the control means (501) at the same time as not displaying a warning on the warning display means The image forming apparatus according to (8), wherein communication failure information is not stored in the means (NV-RAM).

  (12) When a communication failure between the control means (510/501) is detected and AC disconnection is detected, the warning display means (501, 502) is not displayed with the warning at the same time as the external remote diagnosis device. The image forming apparatus according to (8), wherein the notification is not performed.

  Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

  FIG. 1 shows the appearance of a multi-function full-color digital copying machine MF1 according to an embodiment of the present invention. This full-color copying machine is roughly constituted by units of an automatic document feeder (ADF) 120, an operation board 502, a color scanner 300, a color printer 200, and a paper feed bank 35. A LAN (Local Area Network) connected to a personal computer PC is connected to the image data processing apparatus in the apparatus. The facsimile controller in the machine can perform facsimile communication via the exchange PBX and the public communication network PN.

  The printer 200 includes a transfer unit, and the transfer unit includes a transfer belt 208 that is an endless belt. The transfer belt 208 is wound around three support rollers and one tension roller, and is driven to rotate counterclockwise. Near the tension roller, there is a transfer body cleaning unit that removes residual toner remaining on the transfer belt 208 after image transfer.

  The transfer belt 208 between one support roller and another support roller is equipped with image forming units for Bk, Y, M, and C color image forming along these moving directions. There is a transfer roller 205 facing each photoconductor drum with the transfer belt 208 interposed therebetween. Above the image forming apparatus, there is a laser exposure unit 512 that irradiates each photoconductor drum of each color photoconductor unit with laser light for image formation. The photosensitive drum is uniformly charged by the charging roller 204, and a laser whose unit is modulated by an image signal is projected onto the charged surface by the laser exposure unit 512. The developing device develops the electrostatic latent image generated thereby to form a toner image. This toner image is transferred to the transfer belt 208.

  A transfer belt 213 is below the transfer belt 208. The conveyor belt 213 transfers the toner image on the transfer belt 208 onto a sheet. The sheet (transfer sheet) on which the toner image is transferred is sent to the fixing unit 214 by the transport belt 213. Below the conveying belt 213 and the fixing unit 214, there is a double-sided drive unit that is a sheet reversing unit that feeds a sheet immediately after an image is formed on the front surface and reverses the front and back to record an image on the back surface.

  When the start switch is pressed, if there is a document on the automatic document feeder (ADF) 120, it is transported onto the contact glass of the scanner 300, and if there is no document on the ADF 120, the manually placed document on the contact glass Immediately, the scanner 300 is driven, and the first carriage and the second carriage in the scanner 300 are read and scanned. Then, light is emitted from the light source on the first carriage to the contact glass, and reflected light from the document surface is reflected by the first mirror on the first carriage and directed to the second carriage, and reflected by the mirror on the second carriage. Then, an image is formed on a CCD as a reading sensor through an imaging lens. Bk, Y, M, and C color recording data are generated based on image signals obtained by the reading sensor.

  Further, when the start switch is pushed, the transfer belt 208 starts to rotate, the image forming preparation of each unit of the image forming apparatus is started, and the image forming sequence of each color image is started. Thus, an exposure laser modulated based on each color recording data is projected onto the photosensitive drum for each color, and each color toner image is superimposed and transferred as a single image on the transfer belt 208 by each color image forming process. When the leading edge of the toner image enters the conveyor belt 213, the sheet is fed from the registration roller pair 212 to the transfer belt 213 at a timing so that the leading edge enters the conveyor belt 213. The toner image is transferred to the paper. A voltage for transferring toner is applied to the transfer belt 208 by the transfer roller 205. The sheet on which the toner image has moved is sent to the fixing unit 214 where the toner image is fixed on the sheet.

  Note that the above-described sheet is selectively rotated by driving one of the sheet feeding rollers immediately above the sheet feeding trays (also referred to as sheet feeding stages or cassettes) 209 to 211 of the sheet feeding bank 35, so that the sheet feeding bank 35 has multiple stages. The sheet is fed out from one of the paper feed trays 209 to 211, separated by a separation roller, and is separated into a vertically arranged transport roller unit, transported upward, guided to the transport roller unit in the printer 200, and transported After abutting and stopping against the registration roller pair 212 of the roller unit, the roller is sent to the conveyor belt 213 at the timing described above. It is also possible to feed paper by inserting paper on the right side manual feed tray. When the user is inserting paper onto the manual feed tray, the printer 200 rotates the paper feed roller of the manual feed tray to separate one sheet on the manual feed tray and pull it into the manual feed path. Stop against the pair 212.

  The paper discharged after receiving the fixing process by the fixing unit 214 is guided to the discharge roller by the switching claw and stacked on a paper discharge tray (not shown). Alternatively, it is guided to the double-sided drive unit by the switching claw, reversed there and led again to the transfer position, and the image is recorded also on the back surface, and then discharged onto the paper discharge tray by the discharge roller. On the other hand, residual toner remaining on the transfer belt 208 after image transfer is removed by a transfer body cleaning unit (not shown) to prepare for image formation again.

  FIG. 2 shows a system configuration of the electrical system of the multifunction copying machine MF1 shown in FIG. The electrical system includes a controller 501 that performs overall control of the image forming apparatus, an operation board 502 of the image forming apparatus that is connected to the controller 501, an HDD 503 that stores image data, and communication that performs external communication using an analog line. Control device interface board 504, LAN interface board 505, FAX control unit 506 connected to general-purpose PIC bus, IEEE1394 board, wireless LAN board, USB board, etc. 507, engine control 510 connected to controller via PCI bus, An I / O board 513 for controlling I / O of the image forming apparatus, a scanner board (SBU: Sensor Board Unit) 511 for reading a copy original (image), and image data stored on the drum. Written in Composed LDB (laser diode board) 512, such as writing.

  A reading unit 300 that optically reads an original scans the original with an original illumination light source and forms an original image on the CCD 520. The original image, that is, the reflected light of light irradiation on the original is photoelectrically converted by the CCD 520 to generate R, G, B image signals.

  The communication control device interface board 504 immediately notifies an external remote diagnosis device when a failure occurs in the device, and allows a serviceman to recognize the content and situation of the failure part and repair it immediately. . In addition, it is also used for sending out the usage status of the device.

  The CCD 520 shown in FIG. 2 is a 3-line color CCD that generates EVENch (even pixel channel) / ODDch (odd pixel channel) R, G, and B image signals and inputs them to an analog ASIC (Application Specific IC) on the SBU board. To do. The SBU board includes an analog ASIC and a circuit that generates drive timings for the CCD and analog ASIC. The output of the CCD 520 is sampled and held by a sample and hold circuit inside the analog ASIC, then A / D converted, converted into R, G and B image data, and shading corrected, and an output I / F (interface) At 520, the data is sent to an image data processor IPP (Image Processing Processor; hereinafter simply referred to as IPP) via an image data bus.

  IPP is a programmable arithmetic processing means that performs image processing, separation generation (determination of whether an image is a character area or a photographic area: image area separation), background removal, scanner gamma conversion, filter, color correction, scaling, and image processing. , Perform printer gamma conversion and gradation processing. The image data transferred from the SBU to the IPP is corrected by the IPP for signal deterioration due to quantization of the optical system and the digital signal (signal deterioration of the scanner system) and written in the frame memory 521.

  The system controller 501 includes a ROM that controls the CPU and the system controller board, a RAM that is a working memory used by the CPU, a lithium battery, an NV-RAM that includes an SRAM backup and a clock, and a system controller board. The system bus control, frame memory control, FIFO, and other ASICs for controlling the CPU periphery and their interface circuits are mounted.

  A system controller 501 has functions of a plurality of applications such as a scanner application, a facsimile application, a printer application, and a copy application, and controls the entire system. The input of the operation board 502 is decoded, and the setting of the system and the contents of the state are displayed on the display unit of the operation board.

  Many units are connected to the PCI bus, and image data and control commands are transferred in a time-sharing manner by the image data bus / control command bus.

  The communication control device interface board 504 is a communication interface board between the communication control device and the controller 501. Communication with the controller 501 is connected by full-duplex asynchronous serial communication. The communication control device 522 is multi-drop connected according to the RS-485 interface standard. Communication with the remote management system is performed via the communication controller device interface board 504.

  The LAN interface board 505 is connected to an in-house LAN. It is a communication interface board between the in-house LAN and the controller 501, and is equipped with a PHY chip. The LAN interface board 505 and the controller 501 are connected by standard communication interfaces of a PHY chip I / F and an I2C bus I / F. Communication with an external device is performed via the LAN interface board 505.

  The HDD 503 is used as an application database that stores system application programs and device activation information of printers and image forming process devices, and an image database that stores image data of read images and written images, that is, image data and document data. . Both the physical interface and the electrical interface are connected to the controller through an interface compliant with ATA / ATAPI-4.

  The operation board 502 is equipped with a CPU, ROM, RAM, LCD, and ASIC (LCDC) for controlling key input. In the ROM, a control program for the operation board 502 for controlling input reading and display output of the operation board 502 is written. The RAM is a working memory used by the CPU. Through communication with the system controller 501, the panel is operated to perform input for the user to input system settings, and display and input control for displaying the setting contents and status of the system to the user.

  The black (B), yellow (Y), cyan (C), and magenta (M) write signals output from the work memory of the system controller 501 are the L, B, Y, M, and L of the LDB (Laser Diode control Board). Input to a C LD (Laser Diode) writing circuit. The LD write circuit performs LD current control (modulation control) and outputs the result to each LD.

  The engine control 510 mainly performs image formation control for image formation, and includes a CPU, an IPP for performing image processing, a ROM containing a program necessary for controlling copying and printing, a RAM necessary for the control, and an NV -RAM is installed. The NV-RAM is equipped with an SRAM and a memory that detects power-off and stores it in the EEPROM. The I / O ASIC that also has a serial interface that sends and receives signals to and from other CPUs that perform control is a nearby I / O (counter, fan, solenoid, motor, etc.) on which an engine control board is mounted. ASIC for controlling the). The I / O control board 513 and the engine control board 510 are connected via a synchronous serial interface.

  A sub CPU 517 is mounted on the I / O control board 513 and performs I / O control of the image forming apparatus including analog control such as P sensor and T sensor. When the door is opened and closed, it detects the installation of a new process cartridge. When the door SW connected to the I / O control board 513 in FIG. 2 is opened, there is a possibility that the process cartridge has been replaced, so confirmation is performed and the result is transmitted to the engine control 510.

  The interface circuit 515 is an interface circuit with an IC tag mounted on the process cartridge. Communication between the non-contact communication means 516 and the main body control unit is performed by an asynchronous serial interface. The non-contact communication means 516 modulates the signal output from the main body side into a predetermined signal for transmission and sends it to the transmitting / receiving antenna. The non-contact communication means on the process cartridge side demodulates the received signal received by the transmission / reception antenna of the process cartridge from a predetermined signal for transmission, changes to a parallel signal, and sends it to the CPU of the process cartridge. The same operation is performed when transmitting from the CPU of the IC tag on the process cartridge side to the main body side by non-contact communication means. Alternatively, the interface circuit 515 may be connected to a non-volatile memory mounted on the process cartridge.

  The first power supply unit PSU (1) 514 is a unit that supplies power to control the image forming apparatus. When the main SW is turned on (closed), commercial power is supplied. The commercial AC is supplied from the commercial power source to the AC control circuit 540, and, as shown in FIG. 3, the AC power output PSU ( 1) 514 supplies the necessary DC voltage to each control board. The CPU of each control unit operates using a constant voltage generated by the first power supply unit PSU (1). Further, particularly when the apparatus is large and the control unit is located in various places such as an image forming apparatus, a voltage drop occurs when a constant voltage for control, for example, 5 V is electrically connected from the power supply unit PSU with an electric wire called a harness. Therefore, 5V is transmitted to the control board in the vicinity of the PSU, and this is used as a control voltage for the CPU or the like. In the case of a remote control board, a motor or the like is generally used with a relatively high voltage such as 24V. In some cases, a voltage used for a high load is transmitted, and the voltage is stepped down on the control board and converted to 5V for use.

  When the main SW is turned on (closed), the CPU is properly activated by providing a reset mechanism for resetting activation for each CPU, and communication between the CPUs between the control boards is normally performed. However, control is disabled when the main SW is OFF (open) (point A in FIG. 5). In particular, as described above, when communication is being performed between the control CPU using 5 V of the PSU and the control CPU using 24 V of the PSU while being stepped down, communication failure may occur because the CPU on one side becomes uncontrollable at that time. There is.

  As shown in FIG. 5, since a large-capacity capacitor is connected to a power source for high loads such as 24V for voltage stabilization, the gradient of voltage drop is larger than that for 5V for low loads. It ’s different. Further, since the voltage drop of 24V is slow and further reduced to 5V, in some cases, 5V is stably generated until the voltage drops to close to 5V (point C in FIG. 5). As a result, the former CPU Immediately becomes uncontrollable (point B in FIG. 5), but the latter remains in a controllable state for a while.

  In such a case, the latter control CPU detects a communication failure, and there is a problem that an unnecessary failure state such as warning display on the display unit, storage in the non-volatile storage unit, notification to an external remote diagnosis is performed. . Of course, if all of these voltages drop, it is impossible to immediately display a warning on the display unit or report to a remote diagnosis, but the power is turned on again by the information stored in the non-volatile storage unit. Sometimes done. Therefore, it is determined that the apparatus is out of order based on these pieces of information, and repairs by the service person and downtime of the apparatus will occur.

  In this embodiment, the CPU of the controller 501 detects that the main SW has been turned off using a means for detecting the AC cutoff state at this time. In this case, a communication failure occurs between the control units. Since the operator is in an OFF state, no warning display, storage of communication failure, or notification to the outside is performed. The AC cutoff state is detected using a zero cross detection circuit shown in FIG. That is, when the zero cross signal is interrupted, the CPU of the controller 501 detects that the main SW is turned off. The zero-cross signal in FIG. 3 is a signal mainly used for energization control of the heater of the image forming apparatus, and does not require a new circuit for the detection circuit and does not increase the cost.

  Also, since the slope of each constant voltage output drop when the main SW is OFF can be confirmed by the configuration of the device load, etc., and the PSU configuration, the power supply used for the detection circuit such as the zero cross signal is a power supply with a gentle slope. That is, it is only necessary to use a power source common to the control CPU portion that performs control to the end and recognizes communication failure with other control units.

  There is also a configuration having a plurality of PSUs such as the second power supply unit PSU (2) 530. In this case, there is the same problem as when the control voltage is generated from 24V. In this case, the drop gradient of each output 5V (1), 5V (2) changes as shown in FIG. 6 due to the influence of the load connected to each PSU, the capacitor for voltage stabilization, etc. A similar problem occurs in detecting a communication failure between points C and C. At this time, the CPU receiving 5V (2) power supply can detect the failure of the main SW by detecting the interruption of the zero cross signal in the same manner.

  FIG. 4 is an operation flow in the above embodiment. When the CPU of the controller 501 detects an abnormality in the communication, it confirms the AC energization state (AC cutoff detection) (S1, S2), that is, confirms whether or not a zero cross signal is generated, and the AC is energized (there is a zero cross signal). If so, the warning display on the liquid crystal display of the operation board 502, the storage in the nonvolatile memory NV-RAM, and the notification to the external remote diagnosis apparatus (management apparatus) via 504 and 522 are performed as before (S3). S4). On the other hand, if AC interruption (no zero cross signal) is detected even if a communication abnormality is detected, the abnormality processing is masked and the abnormality processing operation is not performed (S5).

  As described above, reliable communication abnormality determination between the control units of the image forming apparatus having a plurality of control units and a plurality of PSUs can be performed.

1 is a longitudinal sectional view of a multi-function full-color copying machine equipped with a power supply device according to a first embodiment of the present invention. FIG. 2 is a block diagram showing an outline of an image processing system of the copying machine shown in FIG. 1. FIG. 3 is a block diagram showing a configuration of an AC control circuit 540 shown in FIG. 5 is a flowchart showing an overview of CPU communication monitoring of a controller 501 shown in FIG. 2. 3 is a time chart showing changes in output voltage of a power supply device 514 shown in FIG. 2. 3 is a flowchart showing changes in output voltages 5V (1) and 5V (2) of power supply devices 514 and 530 shown in FIG.

Explanation of symbols

502: Operation board 300: Color document scanner 120: Automatic document feeder 200: Color printer PC: Personal computer PBX: Exchanger PN: Communication line 512: Optical writing unit 204: Charging roller 205: Transfer roller 208: Transfer belts 209 to 211 : Paper feed tray 212: Registration roller pair 213: Conveying belt 214: Fixing units 514 and 530: Power supply device

Claims (7)

AC / DC converting means for converting AC voltage fed through the main switch into DC voltage; DC power supply device for adjusting the DC voltage to a set voltage; and control of image processing fed from the DC power supply device In an image processing apparatus provided with a control means,
AC interruption detection means for detecting interruption of the AC voltage to the AC / DC conversion means before the output voltage of the DC power supply device drops below the operating voltage of the control means by turning off the main switch. An image processing apparatus.   There are a plurality of the DC power supply devices; the control means is also a plurality of power supplied from each DC power supply device; the image processing apparatus further includes a communication means for performing communication between the control means; The communication failure information is generated only when the AC interruption detection unit detects that an AC voltage is applied when a communication failure between the control units is detected by the communication unit; Image processing device.   The image processing apparatus according to claim 2, further comprising display means for displaying the communication failure information.   The image processing apparatus according to claim 2, wherein the control unit writes the communication failure information in a nonvolatile memory.   The image processing apparatus according to claim 2, wherein the control unit notifies the communication failure information to a remote management apparatus by communication to the outside.   The image processing apparatus includes image forming means for forming an image on a sheet; one of the control means is engine control means for controlling image formation by the image forming means; and another control means is: 6. The image processing apparatus according to claim 1, wherein the image processing apparatus exchanges document information by communication with the outside. Further, it includes a document scanner that reads a document image and generates image data representing the image; the engine control unit reads the document image of the document scanner, forms an image by the image forming unit based on the read image data, and reads The image processing apparatus according to claim 6, wherein image data is sent to the system control unit.

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