JP2005136858A - Image reading apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image reading apparatus for transferring print data generated on the basis of image data of a read original to a printer device via a communication cable capable of carrying out proper error recovery processing when the printer device is reconnected to the image reading apparatus after connection to the printer device by the communication cable is released during the transfer of the print data and a transfer error takes place. <P>SOLUTION: When the printer device is reconnected to the image reading apparatus after the occurrence of the transfer error due to the disconnection of the connected printer by the communication cable during the transfer of the print data generated on the basis of the read image data to the printer device via the communication cable, the image reading apparatus transfers un-transferred pages of the print data when the reconnected printer device is the printer device having been connected before the occurrence of the transfer error and transfers the print data from a top page when the printer device having been connected before the occurrence of the transfer error is a different printer device. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an image reading apparatus, and more particularly to an image reading apparatus that transfers print data generated based on image data of a read original to a printer apparatus via a communication cable.

  When transmitting image data of a document by facsimile, in addition to information such as a transmission source ID and the total number of pages of a transmitted document by NSS (non-standard function setting signal), image data of the transmitted document is transmitted after transmitting a document identifier. There is a facsimile apparatus that performs facsimile transmission (for example, see Patent Document 1).

  This facsimile machine on the transmission side disconnects the line once when a communication error occurs, calls again after the set time has elapsed, transmits the document identifier at the NSS, and transmits the remaining image data. Do. On the other hand, the facsimile machine on the receiving side stores the document identifier together with the image data received by facsimile before the occurrence of the communication error. If the document identifier assigned to the image data received by facsimile after the occurrence of the communication error is the same as the document identifier stored before the occurrence of the communication error, the image data of the same document was received by facsimile before the communication error. The image data and the image data received by facsimile after the occurrence of a communication error are combined to generate print data, which is output to the printer device via the LAN. Therefore, in the facsimile apparatus on the receiving side, the image data divided by the communication error are combined and output to the printer apparatus, so that the image of the image data originally of the same original is printed in a batch on the printer apparatus. be able to.

  On the other hand, there is an image reading device (scanner) that can transfer image data of a read original to a printer device directly connected by a USB (Universal Serial Bus) cable or the like and print it. When copying (copying) processing is performed using the image reading apparatus and the printer apparatus, the image reading apparatus generates print data based on the image data of the read original, and the print data is transmitted to the printer apparatus via the USB cable. The printer device analyzes the print data received from the image reading device and forms a print image on the paper.

Therefore, the image reading apparatus can cause the printer apparatus to perform a printing process without including a printing unit that records an image of image data on a sheet in the apparatus. In the image reading apparatus that transfers print data to the printer apparatus, if the USB cable is disconnected and the connection with the printer apparatus is disconnected during the print data transfer, a transfer error occurs. After the transfer error occurs, when the printer device connected before the transfer error occurs is reconnected, the image reading device transfers the remaining print data that could not be transferred due to the transfer error. It is possible to prevent uselessness.
Japanese Patent Application Laid-Open No. 8-298581

  However, if a printer device different from the one connected before the transfer error occurs after the transfer error occurs, the same print data will be transferred to a different printer device, and the same document will be copied. However, there is a problem that the image quality differs between the recording paper on which the print data is recorded before the transfer error occurs and the recording paper on which the print data is recorded after the transfer error occurs.

  The present invention has been made in view of the above problems, and an image reading apparatus that transfers print data generated based on image data of a read original to a printer apparatus via a communication cable is used for communication during print data transfer. It is an object of the present invention to provide an image reading apparatus capable of performing an appropriate error recovery process when a connection error is generated after a connection with a printer device by a cable is cut and a transfer error occurs.

  To achieve the above object, an image reading apparatus according to claim 1 is generated by an image reading means for reading image data of a document, a print data generation means for generating print data based on the read image data, and Transfer means for transferring print data to a printer device via a communication cable, detection means for detecting a connection state with the printer device via the communication cable, and disconnection from the printer device during print data transfer by the transfer means When the detection means detects that the printer device has been disconnected, the storage device for storing information relating to the untransferred page of the print data and the printer device are disconnected after the connection with the printer device is disconnected. When the detection means detects, the reconnected printer device is a printer device connected before the disconnection. Determining means for determining whether or not to the transfer means based on the information stored in the storage means when the determining means determines that the printer device connected before the disconnection has been reconnected. Transfer control means for transferring the untransferred page of the print data and performing transfer control for causing the transfer means to transfer the print data again from the first page when it is determined that a different printer is connected. It is said.

  According to a second aspect of the present invention, in the image reading apparatus according to the first aspect, the transfer control means is within a set time after the connection with the printer device via the communication cable is disconnected during the print data transfer. When the detection unit detects that the printer device has been reconnected, the transfer control is performed, and when the detection unit detects that the printer device has been reconnected after the set time has elapsed, Regardless of the determination result of the determination means, the transfer means transfers the print data again from the first page.

  The image reading apparatus according to claim 3, wherein the image reading unit detects that the connection has been disconnected by the detection unit during an image reading operation. In this case, the image reading operation is continuously performed until the image reading of the job being executed is completed.

  The image reading apparatus according to claim 4 is an image reading unit that reads image data of a document, a print data generation unit that generates print data based on the read image data, and the generated print data via a communication cable. Transfer means for transferring to a printer apparatus; identification information acquisition means for acquiring identification information of the printer apparatus via the communication cable; detection means for detecting a connection state of the printer apparatus with the communication cable; and print data transfer Monitoring means for monitoring the occurrence of a transfer error based on the detection result of the detection means, storage means for storing information relating to an untransferred page of the print data when the transfer error occurs, and the transfer error If the detection means detects that the printer device has been reconnected after the occurrence, the identification information acquisition procedure Is determined to determine whether or not the identification information acquired before the occurrence of the transfer error matches the identification information acquired from the reconnected printer device, and if the identification information is determined to match, Based on the information stored in the storage unit, the transfer unit transfers the untransferred page of the print data, and when it is determined that they do not match, the transfer unit transfers the print data from the first page. And a transfer control means for performing transfer control.

  According to the image reading apparatus of the first aspect, when the connection with the printer device by the communication cable is once disconnected during the print data transfer, and the same printer device is reconnected before the connection is disconnected. Since the untransferred page of the print data is transferred, the print data can be transferred efficiently without performing unnecessary processing such as transferring the print data from the first page again. Also, if the printer is connected to the printer device via the communication cable during the print data transfer and the printer device is different from that before the connection is disconnected, the print data is transferred again from the first page. There is no difference in image quality between recording sheets on which images of the same document are recorded.

  According to the image reading device of the second aspect, when the connection with the printer device by the communication cable is disconnected during the print data transfer and the same printer device as that connected before the disconnection is reconnected. The user cannot recognize that the recording paper ejected from the printer device before the connection is disconnected and the recording paper ejected after the printer device is reconnected are images of the same document. Can be prevented.

  According to the third aspect of the present invention, if the document image reading operation is not completed when a transfer error occurs, the document image reading operation is continuously performed. Compared to when the document image reading operation is temporarily stopped when the document is disconnected and the image reading operation of the document is resumed after the printer device is reconnected, from the start of the document reading operation to the completion of the printing process in the printer device. It is possible to reduce the time required for

  According to the image reading device of the present invention, after the transfer error occurs, when the same printer device as that before the transfer error is reconnected, the untransferred page of the print data is transferred. Therefore, print data can be efficiently transferred without performing unnecessary processing such as transferring again. Also, if a printer device different from the one before the transfer error is connected after the transfer error occurs, the print data is transferred again from the first page, so that the image quality of the recording paper on which the image of the same document is recorded is different. There is no.

  Hereinafter, an image reading apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram illustrating a configuration example of the image reading apparatus 1. As shown in the figure, the image reading apparatus 1 includes a control unit (MPU: Microprocessing Unit) 2, a document reading unit 3, an image processing circuit 4, a codec (CODEC) 5, an operation unit 6, a display unit 7, an image. The memory 8, the PDL conversion circuit 9, the communication unit 10, the USB host controller 11, the ROM (Read Only Memory) 12, and the RAM (Random Access Memory) 13 are provided. It is connected so that it can communicate.

  The control part 2 controls each part which comprises the image reading apparatus 1 according to a predetermined program. The document reading unit 3 functions as an image reading unit that reads image data of a document, and includes a mechanism that can read image data of a color document. Although not shown, the document reading unit 3 includes a color line sensor (CCD: Charge Coupled Device), an A / D converter, and the like, reads a document with the color line sensor, performs A / D conversion, shading correction, and deviation / line. RGB color system image data subjected to image processing such as correction is generated and output to a predetermined output destination.

  The image processing circuit 4 performs predetermined image processing on the RGB color system image data output from the document reading unit 3. Specifically, the image processing performed here is input color conversion processing for converting RGB color system image data into YCrCb color system data or L * a * b * color system image data, enlargement / reduction, ground Color correction, output color conversion processing that converts L * a * b * color system image data into CMYK output color color system image data of 1 bit for each component, error in output color converted image data The image processing circuit 4 performs necessary image processing in accordance with the intended use of the image data of the document read by the document reading unit 3.

  The codec 5 converts the image data output from the image processing circuit 4 into JPEG (Joint Photographic Experts Group), MH (Modified Huffman), MR (Modified Read), MMR (Modified Modified Read), JBIG (Joint Bi-level Image). The image data received by facsimile is decoded by compression encoding using the Group method.

  The operation unit 6 is linked with the display unit 7 such as a start key for instructing the document reading unit 3 to start reading a document, a numeric keypad for inputting a facsimile number, the number of copies, and the like, and a cursor key for performing various settings. Various operation keys are provided. Although not shown, the display unit 7 includes a liquid crystal display (LCD) that displays various setting states and operation states of the image reading device 1 with characters and graphics, an LED lamp that is turned on or off, A speaker that emits a predetermined warning sound is provided.

  The image memory 8 is image data compressed and encoded by the codec 5, image data directly output without compression encoding from the image processing circuit 4, image data received by facsimile from an external device, and generated by the PDL conversion circuit 9 Stored print data is stored.

  The PDL conversion circuit 9 functions as print data generation means for converting the image data stored in the image memory 8 into PDL (Page Description Language) such as PostScript or ESC / Page to generate print data (PDL data). To do. The print data generated in the PDL conversion circuit 9 is transferred to the printer device 16 via the USB cable (communication cable) 15 by the USB host controller 11 and all pages of the print data to the printer device 16 are transferred. It is stored in a predetermined area of the image memory 8 until it is completed.

  The communication unit 10 includes a modem 17 and an NCU (Network Control Unit) 18. The modem 17 is, for example, a recommendation V.16 of ITU-T (International Telecommunication Union Telecommunication Standardization Sector). Modulation and demodulation of transmission / reception data according to the 34 standard or the like. The NCU 18 is a line network control device that controls a telephone line to place or disconnect a telephone call, and is connected to a PSTN (Public Switched Telephone Network) 19.

  The USB host controller 11 executes a USB (Universal Serial Bus) host controller function, and both ends of the USB cable 15 are connected to the USB port 20 provided in the USB host controller 11 and the USB port 20 of the printer apparatus, respectively. By being connected, the image reading apparatus 1 can transfer various data such as print data to the printer apparatus 16 via the USB cable 15. The USB host controller 11 and the USB cable 15 that transfer print data according to the control command of the control unit 2 function as a transfer unit.

  When the connectors at both ends of the USB cable 15 are actually connected to the USB port 20 of the image reading device 1 and the printer device 16, the USB host controller 11 electrically detects that the printer device 16 is connected. Conversely, the USB cable 15 that connected the image reading device 1 and the printer device 16 is pulled out of the USB port 20 by the user or the like, and the connection between the image reading device 1 and the printer device 16 is disconnected. And the USB host controller 11 functions as a detecting means for detecting the connection state with the printer device 16 via the USB cable 15. The control unit 2 determines whether a transfer error has occurred based on the detection result of the USB host controller 11 during transfer of print data, that is, the USB cable 15 is connected to the USB port during transfer of print data by the USB host controller 11. It is for monitoring whether or not it has exited 20 and functions as a monitoring means.

  When the USB host controller 11 electrically detects that the printer device 16 is connected by the USB cable 15, the USB host controller 11 negotiates with the printer device 16 that is the connection destination device to identify the printer device 16. The USB host controller 11 functions as identification information acquisition means. The acquired identification information is specifically the manufacturer name, model name, and corresponding PDL type of the printer device 16.

  The ROM 12 stores various programs for the operation of each unit of the image reading apparatus 1 to be controlled by the control unit 2. The RAM 13 functions as a main memory, work area, and the like of the control unit 2 and stores identification information of the printer device 16 acquired by the USB host controller 11 through negotiation with the printer device 16 in addition to a facsimile number and the like. To do.

  Further, in addition to the identification information of the printer device 16, information related to the untransferred page of the print data is stored in the RAM 13 as a storage unit. Here, the information regarding the untransferred page of the print data is that the USB cable 15 is disconnected from the USB port 20 and the connection with the printer device 16 is disconnected while the print data is being transferred to the printer device 16 via the USB cable 15. When a transfer error occurs, information relating to a page of untransferred print data that has not been transferred to the printer device 16 when the connection is disconnected. For example, when a 10-page original is read to generate print data, and the print data is transferred to the printer device 16 to perform print processing, if a transfer error occurs during transfer of print data for the 6th page, the 6th and subsequent pages Information indicating that print data has not been transferred is stored in the RAM 13 as information relating to an untransferred page.

  If the printer device 16 is once disconnected from the USB cable 15 during print data transfer and then reconnected by the USB cable 15, the USB host controller 11 determines that the printer device is reconnected. New identification information is acquired. Here, the control unit 2 functions as a determination unit that determines whether the identification information already stored in the RAM 13 matches the identification information newly acquired from the printer device to which the USB host controller 11 is reconnected. . Thereby, it can be determined whether or not the reconnected printer device is the printer device 16 connected before the connection by the USB cable 15 is disconnected. After the determination by the control unit 2 is made, the identification information already stored in the RAM 13 before the connection is disconnected is the identification information newly acquired from the printer device to which the USB host controller 11 is reconnected. Updated.

  The control unit 2 serving as a transfer control unit performs print data transfer control based on the determination result. Specifically, if it is determined that the identification information stored in the RAM 13 and the newly acquired identification information match, it is assumed that the printer device 16 connected immediately before disconnection is reconnected. Based on the information related to the untransferred page of the print data stored in the RAM 13, the USB host controller 11 is caused to transfer the untransferred page of the print data stored in the image memory 8. Conversely, if it is determined that the identification information stored in the RAM 13 and the newly acquired identification information do not match, a printer device that is different from the printer device 16 that was connected before the connection was disconnected was connected. As an example, the print data stored in the image memory 8 is transferred again from the first page to the USB host controller 11. If the printer device 16 is reconnected by the USB cable 15 after a preset time has elapsed since the transfer error has occurred, the control unit 2 causes the reconnected printer device to generate a transfer error. Regardless of whether or not the printer device 16 was previously connected, the USB host controller 11 is caused to transfer print data from the first page anew.

  The printer device 16 is a device that is directly connected to the image reading device 1 via the USB cable 15 and receives print data, and performs print processing based on the received print data, and records an image of color image data on a sheet. It has a mechanism to do. Specifically, the received print data is expanded to generate bitmap data, and an image of the generated bitmap data is recorded on a sheet by, for example, an electrophotographic method for each page.

  The image reading device 1 configured as described above is connected to the printer device 16 via the USB cable 15 and the image data of the document read by the document reading unit 3 or the image data received by facsimile from an external device. The print data generated based on the above is transferred to the printer device 16 via the USB cable 15, and printing processing is performed in the printer device 16.

  Next, processing operations executed in the image reading apparatus 1 when the image reading apparatus 1 having the above configuration and the printer apparatus 16 are connected by the USB cable 15 and copying (copying) processing is performed are shown in the flowcharts shown in FIGS. Based on The processing operation of the image reading apparatus 1 described based on the following flowchart is performed in accordance with a command issued by the control unit 2 based on a control program stored in the ROM 12.

  When the USB cable 15 is connected to the USB port 20 of the image reading device 1 and the printer device 16 by a user or the like, the USB host controller 11 of the image reading device 1 electrically connects the printer device 16 with the USB cable 15. (S1). The USB host controller 11 of the image reading apparatus 1 requests identification information by outputting a predetermined signal to the printer apparatus 16 that is the connection destination (S2), and the identification information returned as a response from the printer apparatus 16 is sent. This is received (S3) and stored in a predetermined area of the RAM 13 (S4).

  In this way, with the image reading device 1 and the printer device 16 connected by the USB cable 15, the control unit 2 sets a manuscript on the manuscript reading unit 3 of the image reading device 1, and performs a copying process. Based on whether or not an operation for starting the document (such as pressing the start key) has been performed, it is determined whether or not a document reading start command has been issued (S11). (S11: YES) reads the image data of the document and generates print data (S12).

  Specifically, when reading image data of a color document, the document reading unit 3 reads an image of the color document and outputs RGB color system color image data, and the image processing circuit 4 receives the image data from the document reading unit 3. Image processing such as enlargement / reduction, ground color correction, etc. after input color conversion processing for converting the output RGB color system color image data into L * a * b * color system image data Apply. The codec 5 compresses and encodes the color image data subjected to predetermined image processing in the image processing circuit 4 by the JPEG method, and the PDL conversion circuit 9 prints based on the color image data compressed and encoded by the JPEG method. Generate data. The image data that has undergone image processing in the image processing circuit 4 is directly output to the PDL conversion circuit 9 without going through the codec 5, and print data is generated based on the image data that has not been compression-encoded in the PDL conversion circuit 9. You may make it do.

  Subsequently, the control unit 2 stores the generated print data in the image memory 8 (S13), and causes the USB host controller 11 to transfer the print data to the printer device 16 via the USB cable 15 (S14). Subsequently, the control unit 2 determines whether the connection with the printer device 16 via the USB cable 15 is disconnected during the transfer of the print data based on the detection result of the USB host controller 11 (S15). If it is determined that the connection has not been disconnected (S15: NO), it is determined whether or not the transfer of all pages of the print data has been completed (S16). If it is determined that the transfer has been completed (S16: YES) ), The print data stored in the image memory 8 in S13 is deleted (S17).

  On the other hand, if the control unit 2 determines that the transfer of all pages of the print data has not been completed (S16: NO), it continues to transfer the remaining print data to the printer device 16 (S14), and the process of S15. To monitor whether or not the connection is disconnected (S15). Here, when it is determined that the connection is disconnected (S15: YES), that is, when it is determined that the USB cable 15 is disconnected from the USB port 20, the control unit 2 relates to the transfer page counted during print data transfer. Based on the information, the page number of the print data being transferred when the connection is disconnected is determined, and information relating to the untransferred page is stored in the RAM 13 (S18). Here, information related to untransferred pages is stored, but information related to already transferred pages may be stored.

  Then, the control unit 2 notifies a predetermined warning and also notifies information indicating that a reconnection of the printer device by the USB cable 15 is requested (S19). Specifically, messages such as “Transfer error has occurred” and “Please connect the printer” are displayed on the liquid crystal display device of the display unit 7. In addition, you may make it sound a predetermined warning sound from the speaker with which the display part 7 is provided with this display.

  Next, the control unit 2 determines whether or not the image reading operation of the document in the document reading unit 3 is completed (S20), and when it is determined that it is not completed (S20: NO), that is, the image reading operation. When the USB host controller 11 detects that the connection with the printer device 16 via the USB cable 15 is disconnected during execution of the document, the document reading unit 3 reads the document until the image reading of the job being executed is completed. The image reading operation is continued (S21). Then, the control unit 2 determines whether the USB cable 15 is inserted into the USB port 20 and the printer device is reconnected (S22). If it is determined that the printer device is reconnected (S22: YES), The same processing as S1 to S4 is performed to acquire and store the identification information of the printer device 16 (S23).

  Then, the control unit 2 determines whether or not the set time has elapsed since it was determined that the connection with the printer device 16 was disconnected in S15 (S24). If it is determined that the set time has not elapsed (S24: NO), it is determined whether or not the identification information acquired in S23 matches the identification information stored in the RAM 13 in advance (S25). If it is determined that they match (S25: YES), the USB host controller 11 transfers the untransferred page of the print data stored in the image memory 8 based on the information about the untransferred page stored in the RAM 13 in S18. (S26). On the other hand, when the control unit 2 determines that the set time has elapsed since the connection with the printer device 16 is disconnected in S24 (S24: YES), and the identification information acquired after the reconnection of the printer device in S25 is previously stored. When it is determined that it does not match the identification information stored in the RAM 13 (S25: NO), the USB host controller 11 transfers the print data stored in the image memory 8 again from the first page (S27).

  Then, the control unit 2 determines whether or not the transfer of all pages of the print data has been completed (S16). If it is determined that the transfer has been completed (S16: YES), the print data stored in the image memory 8 is determined. Is deleted (S17).

  As described above, when a transfer error occurs in which the connection with the printer device via the USB cable 15 is disconnected during print data transfer, when the printer device is reconnected, the reconnected printer device transfers Based on whether or not the printer device 16 was connected before the error occurred, a process of transferring an untransferred page of print data or a process of transferring the print data again from the first page is performed.

  The communication cable for connecting the image reading apparatus 1 and the printer apparatus 16 is not limited to the USB cable 15 as long as various data can be transferred to and from the printer apparatus 16 and can be inserted and removed. For example, a LAN cable or a parallel cable may be used. In the present embodiment, the case where the print data generated based on the image data of the document read by the document reading unit 3 is transferred to the printer device 16 has been described. Even if a transfer error occurs during transfer of the print data generated based on this and the printer device is reconnected, the process of transferring the untransferred page of print data or the process of transferring the print data from the first page is performed again. Is called.

  The present invention can be applied to various apparatuses that can perform printing by transferring print data to a printer apparatus via a communication cable.

1 is a block diagram illustrating a configuration example of an image reading apparatus. 6 is a flowchart illustrating processing operations performed between the image reading apparatus and the printer apparatus when the image reading apparatus and the printer apparatus are connected by a USB cable. 6 is a flowchart showing a processing operation performed in the image reading apparatus when there is a document reading start command in the document reading unit. 6 is a flowchart showing a processing operation performed in the image reading apparatus when there is a document reading start command in the document reading unit.

Explanation of symbols

1 Image Reading Device 2 Control Unit (MPU)
3 Document Reading Unit 5 Codec 8 Image Memory 9 PDL Conversion Circuit 11 USB Host Controller 12 ROM
13 RAM
15 USB cable 16 Printer device 20 USB port

Claims (4)

  Image reading means for reading image data of a document; print data generating means for generating print data based on the read image data; transfer means for transferring the generated print data to a printer device via a communication cable; A detecting means for detecting a connection state with the printer device via a communication cable; and when the detecting means detects that the connection with the printer device has been disconnected during the print data transfer by the transferring means, When the detection unit detects that the storage unit that stores information relating to the transfer page and the printer device is reconnected after the connection with the printer device is disconnected, the reconnected printer device is Determining means for determining whether or not the printer apparatus is connected to the printer, and the determining means is connected before the disconnection. When it is determined that the printer device that has been connected is reconnected, based on the information stored in the storage unit, the transfer unit transfers the untransferred page of the print data, and it is determined that a different printer device is connected. An image reading apparatus comprising: transfer control means for performing transfer control for causing the transfer means to transfer the print data again from the first page.   The transfer control unit performs the transfer control when the detection unit detects that the printer device is reconnected within a set time after the connection with the printer device via the communication cable is disconnected during print data transfer. If the detection unit detects that the printer device has been reconnected after the set time has elapsed, the print data is transferred to the transfer unit from the first page regardless of the determination result of the determination unit. The image reading apparatus according to claim 1, wherein:   The image reading unit continues the image reading operation until the image reading of the job being executed is completed when the detection unit detects that the connection is disconnected during the image reading operation. The image reading apparatus according to claim 1, wherein the image reading apparatus is performed.   Image reading means for reading image data of a document; print data generating means for generating print data based on the read image data; transfer means for transferring the generated print data to a printer device via a communication cable; Based on an identification information acquisition unit that acquires identification information of the printer device via a communication cable, a detection unit that detects a connection state of the printer device via the communication cable, and a detection result of the detection unit during print data transfer Monitoring means for monitoring the occurrence of a transfer error, storage means for storing information relating to an untransferred page of the print data when the transfer error occurs, and the printer device being reconnected after the transfer error has occurred. Is detected by the detection means before the transfer error occurs. Determining means for determining whether or not the identification information acquired from the reconnected printer device matches, and if it is determined that the identification information matches, stored in the storage means A transfer control unit for performing transfer control for causing the transfer unit to transfer an untransferred page of the print data based on the information and causing the transfer unit to transfer the print data from the first page when it is determined that they do not match; An image reading apparatus comprising:

Images