JP2016103751A - Manuscript reading device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manuscript reading device enabling easy verification of whether or not information is written with a discharge ink.SOLUTION: The manuscript reading device includes: a first scanner 21 which reads a manuscript to acquire original image data; a heating roller 23 which discharges the discharge ink through heating processing to heat the manuscript; a second scanner 24 which reads a manuscript after the heating processing by the heating roller 23, to acquire the heated image data; image data comparison means for comparing the original image data with the heated image data; and comparison result notification means for reporting the comparison result of the image data comparison means.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a document reading device that reads a document fed by a document feeding unit.

  In recent years, a decoloring ink has been developed that becomes transparent and decolored by heating to a predetermined temperature by applying heat, and a ball-point pen using the decoloring ink is often used.

JP 2009-260590 A JP 2013-64859 A

  However, since there is almost no difference in the feeling of use between the ballpoint pen using the decoloring ink and the normal ballpoint pen using the ink that does not disappear, the user must fill in with the normal ballpoint pen using the ink that does not disappear. A ballpoint pen that uses decoloring ink may be accidentally used on a document. For example, in the case of important documents such as contract signatures, if a ballpoint pen using decoloring ink is used incorrectly, it may be tampered with, or the ink may disappear over time or visually. There was a point.

Note that Patent Document 1 and Patent Document 2 have been proposed as image forming apparatuses using the characteristics of decoloring ink, but none of them solves the above problems.
Patent Document 1 proposes an original reading apparatus in which an identifier is written with decoloring ink for partial image processing of an original, and the identifier written on the original is erased by performing a heat treatment after reading the original.
Also, in Patent Document 2, the characteristic information of the recording medium is described in advance on the recording medium with a decoloring ink, and an image suitable for printing is obtained from information read from the recording medium in an image forming apparatus having a thermal fixing unit. An image forming apparatus has been proposed in which an identifier of an unnecessary recording medium is deleted after fixing by fixing.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a manuscript reading apparatus capable of easily verifying whether or not written information has been made with a decoloring ink. Is to provide.

The document reading device of the present invention is a document reading device that reads a document fed by a document feeding unit, and reads the document to obtain original image data, and applies heat to the document. Heating means for erasing the decolored ink by performing heat treatment, second reading means for reading the original after the heat treatment by the heating means to obtain post-heating image data, the original image data, and the post-heating The image data comparing means for comparing the image data and the comparison result notifying means for notifying the comparison result by the image data comparing means are provided.
Furthermore, the document reading apparatus of the present invention may further include a heating amount changing unit that changes the amount of heat transferred from the heating unit to the document.
Furthermore, in the document reading apparatus according to the present invention, the heating unit may heat the document from the reading surface side of the document read by the first reading unit and the second reading unit.
The image forming apparatus of the present invention is an image forming apparatus having the above-described original reading device, and it is determined that the original image data and the post-heating image data do not match in the comparison by the image data comparison unit. Original document print data generating means for generating original document print data indicating a mismatched portion with the image data after heating based on the original image data, and the original document print generated by the original document print data generating means Output means for outputting data.
Furthermore, in the image forming apparatus according to the present invention, the original document print data generation unit may generate the original document print data in which a mismatched portion with the image data after heating is emphasized.
Further, in the image forming apparatus of the present invention, the comparison result notifying unit may notify the non-detection of the decolored ink when the original image data and the post-heating image data match.

  According to the present invention, when information is written in the original document with the color erasing ink, the color erasing ink is erased by the heat treatment by the heating means. Therefore, by comparing the original image data with the post-heat image data where the color-erasable ink is erased, it is possible to easily verify whether or not the entered information has been performed with the color-erasable ink. There is an effect.

1 is a schematic side sectional view showing an internal configuration of an embodiment of an image forming apparatus according to the present invention. FIG. 2 is a schematic side cross-sectional view illustrating an internal configuration of a document reading unit and a document feeding unit illustrated in FIG. 1. 1 is a block diagram showing a schematic configuration of an embodiment of an image forming apparatus according to the present invention. 4 is a flowchart for explaining a decolored ink detection operation in the embodiment of the image forming apparatus according to the present invention. It is explanatory drawing explaining the decoloring ink detection operation | movement in embodiment of the image forming apparatus concerning this invention.

Next, embodiments of the present invention will be specifically described with reference to the drawings.
The image forming apparatus according to the present embodiment is a copying machine 1, and includes a document reading unit 2, a document feeding unit 3, a main body unit 5, and an operation unit 6 as illustrated in FIG. 1. The document reading unit 2 is disposed on the upper portion of the main body unit 5, and a recording paper discharge tray 51 is formed between the document reading unit 2 and the main body unit 5. The document feeding unit 3 is disposed on the upper part of the document reading unit 2. Further, the document feeding unit 3 is configured to be retractable, and is configured such that the upper surface of the document reading unit 2 can be opened by opening the document feeding unit 3 upward. The operation unit 6 is disposed on the front side of the copying machine 1. Although the image forming apparatus of the present embodiment has been described with respect to the copying machine 1, it is needless to say that a scanner, a multifunction machine, and the like are included.

  The operation unit 6 is provided with a liquid crystal display unit 61 and operation buttons 62. The user operates the operation unit 6 to input instructions, thereby making various settings of the copying machine 1 and executing various functions such as image formation. The liquid crystal display unit 61 displays the status of the copier 1, displays the image formation status and the number of copies, and can be used as a touch panel for various settings such as functions such as double-sided printing and black-and-white reversal, magnification setting, and density setting. It has become. As the operation buttons 62, a start button for instructing the user to start image formation, a stop / clear button used for stopping image formation, and the like, and various settings of the copying machine 1 are used for default settings. A reset button, a numeric keypad, and the like are provided.

  1 and 2, the document reading unit 2 includes a first scanner 21, a first document reading slit 22, a heating roller 23, a second scanner 24, a second document reading slit 25, and a platen glass. 26. The scanner 21 includes an exposure lamp, a CCD (Charge Coupled Device) sensor, and the like, and is configured to be movable in the document feeding direction by the document feeding unit 3. The first document reading slit 22 is a gap formed in a direction orthogonal to the document feeding direction of the document MS by the document feeding unit 3. The heating roller 23 is a roller having a built-in heating means such as a heater, and is disposed downstream of the first document reading slit 22 in the document feeding direction and applies heat to the document MS. The second scanner 24 includes an exposure lamp, a CCD (Charge Coupled Device) sensor, and the like, and is fixed at a position facing the second document reading slit 25. The second document reading slit 25 is a gap that is disposed downstream of the heating roller 23 in the document feeding direction and formed in a direction orthogonal to the document feeding direction. The platen glass 26 is an original table made of a transparent member such as glass.

  When reading the document MS placed on the platen glass 26, the first scanner 21 is moved to a position facing the platen glass 26 and scans the document MS while scanning the document MS placed on the platen glass 26. The image data is acquired by reading, and the acquired image data is output to the main unit 5. When reading the document MS fed by the document feeding unit 3, the first scanner 21 is moved to a position facing the first document reading slit 22, and the document is passed through the first document reading slit 22. In synchronization with the feeding operation of the document MS by the feeding unit 3, the document MS is read to acquire image data, and the acquired image data is output to the main body unit 5. Further, the heating roller 23 applies heat to the document MS that has passed through the first document reading slit 22 (first scanner 21) from the surface, that is, the reading surface side. Further, the second scanner 24 reads the document MS in synchronization with the feeding operation of the document MS by the document feeding unit 3 through the second document reading slit 25, acquires the image data, and acquires the acquired image data in the main body. Output to unit 5.

  The document feeding unit 3 is an ADF (Auto Document Feeder), and includes a document placing unit 31, a document discharge tray 32, and a document feeding mechanism 33. The document MS placed on the document placement unit 31 is sequentially fed out one by one by the document feeding mechanism 33 to a position facing the first document reading slit 22, the heating roller 23, and the second document reading slit 25. Then, it is discharged to the document discharge tray 32.

  Referring to FIG. 2, the document feeding mechanism 33 is a first roller disposed opposite to the pickup roller 34, the document feeding roller 35, the registration roller 36, and the first document reading slit 22 of the document reading unit 2. A document pressing unit 37, a document pressing roller 38 disposed facing the heating roller 23 of the document reading unit 2, and a second document pressing unit disposed facing the second document reading slit 25 of the document reading unit 2. 39 and a document discharge roller 40, and each roller is rotationally driven by a stepping motor (not shown).

  A plurality of originals MS set on the original placement unit 31 with the image surface facing upward are sent to the original feeding roller 35 by the pickup roller 34 as a primary paper feeding operation. The document sent to the document feeding roller 35 is conveyed toward the registration roller 36. A document feed sensor is disposed on the front side of the registration roller 36 in the document transport direction. The document feeding roller 35 and the pick-up roller 34 are transported by a predetermined distance after the leading edge of the document MS is detected by the document feeding sensor, and then the rotation drive is stopped and the primary sheet feeding operation is completed. Is done. At the end of the primary paper feeding operation, the leading edge of the document MS is in contact with the nip portion of the registration roller 36. As the document feed sensor, for example, an optical sensor that emits light toward the conveyed document MS and receives the reflected light can be used.

  After a lapse of a predetermined time from the end of the primary paper feeding operation, the secondary paper feeding operation is started, and the document feeding roller 35, the registration roller 36, the document pressing roller 38, and the document discharging roller 40 are rotationally driven. As a result, the document MS includes the first document reading position between the first document reading slit 22 of the document reading unit 2 and the first document pressing unit 37, the heating roller 23 and the document pressing roller 38 of the document reading unit 2. After being fed toward the document discharge roller 40 through the document heating position between the second document reading slit 25 of the document reading unit 2 and the second document reading position between the second document pressing unit 39. Then, the document is discharged to the document discharge tray 32 by the document discharge roller 40.

  The main body 5 includes the recording unit 7, and includes a paper feeding unit 52, a recording paper conveyance path 53, a recording paper conveyance roller 54, and a recording paper discharge roller 55. The paper feed unit 52 includes a plurality of paper feed cassettes 52a1 to 52an and recording paper feed rollers 52b1 to 52bn for feeding recording paper from the paper feed cassettes 52a1 to 52an one by one to the recording paper transport path 53. The recording paper feed rollers 52b1 to 52bn, the recording paper transport roller 54, and the recording paper discharge roller 55 function as a recording paper transport unit, and the recording paper is transported. The recording paper fed to the recording paper transport path 53 by the recording paper feed rollers 52 b 1 to 52 bn is transported to the recording unit 7 by the recording paper transport roller 54. Then, the recording paper on which recording has been performed by the recording unit 7 is discharged to the recording paper discharge tray 51 by the recording paper discharge roller 55.

  The recording unit 7 includes a photosensitive drum 71, an exposure unit 72, an image forming unit 73, a transfer unit 74, and a fixing unit 75. The exposure unit 72 is an optical unit including a laser device, a mirror, and the like, and outputs a laser beam based on image data to expose the photosensitive drum 71 to form an electrostatic latent image on the surface of the photosensitive drum 71. To do. The image forming unit 73 is a developing unit that develops the electrostatic latent image formed on the photosensitive drum 71 using toner, and forms a toner image based on the electrostatic latent image on the photosensitive drum 71. The transfer unit 74 transfers the toner image formed on the photosensitive drum 71 by the image forming unit 73 to a recording sheet. The fixing unit 75 heats the recording paper on which the toner image is transferred by the transfer unit 74 to fix the toner image on the recording paper.

  FIG. 3 is a block diagram showing a schematic configuration of the copying machine 1. The document reading unit 2, document feeding unit 3, transport unit (recording paper feed rollers 52 b 1 to 52 bn, recording paper transport roller 54, recording paper discharge roller 55), operation unit 6, and recording unit 7 are the control unit 8. And the operation is controlled by the control unit 8. In addition, an image processing unit 9 and a storage unit 10 are connected to the control unit 8.

  The control unit 8 is an information processing unit such as a microcomputer including a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The ROM stores a control program for controlling the operation of the copying machine 1. The control unit 8 reads out a control program stored in the ROM and develops the control program in the RAM, thereby controlling the entire apparatus according to predetermined instruction information input from the operation unit 6.

  In a normal mode such as copying, when the start key of the operation button 62 of the operation unit 6 is operated with the document MS placed on the document placement unit 31 of the document feeding unit 3, the control unit 8 The original reading unit 2 is instructed to read in a normal operation. When reading in the normal operation is instructed, the document reading unit 2 reads the document MS using only the first scanner 21 to acquire image data, and turns off the heating of the document MS by the heating roller 23. In a normal operation, the heating roller 23 and the document pressing roller 38 of the document feeding unit 3 function only as a document feeding roller that transports the document MS.

  When the operation unit 6 receives an input of a decoloring ink detection instruction from the user, the control unit 8 sets the decoloring ink detection mode. In the decoloring ink detection mode, when the start key of the operation button 62 of the operation unit 6 is operated in a state where the document MS is placed on the document placement unit 31 of the document feeding unit 3, the control unit 8. Instructs the document reading unit 2 to perform reading by the decolored ink detection operation. When reading by the decoloring ink detection operation is instructed, the document reading unit 2 reads the document MS using the first scanner 21 to acquire image data, and turns on the heating of the document MS by the heating roller 23. Then, the heated original MS is read using the second scanner 24 to obtain image data (hereinafter, in the decolored ink detection operation, the image data read using the first scanner 21 is referred to as original image data, and Image data read using the second scanner 24 is referred to as post-heating image data).

  The control unit 8 functions as an image data comparison unit 81 that compares the original image data and the post-heating image data in the decolored ink detection operation. The image data comparison unit 81 compares the original image data and the post-heating image data, displays the comparison result on the liquid crystal display unit 61 of the operation unit 6, and notifies the user.

  Furthermore, the control unit 8 functions as an original document print data generation unit 82 that generates original document print data based on the original image data when the original image data and the heated image data do not match. The original document print data generation unit 82 generates original document print data based on the original image data, and the generated original document print data is printed on recording paper by the recording unit 7.

  The image processing unit 9 is means for performing predetermined image processing on the image data. For example, image improvement processing such as enlargement / reduction processing, gradation adjustment, and density adjustment is performed.

  The storage unit 10 is a storage unit such as a semiconductor memory or an HDD (Hard Disk Drive), and stores image data acquired by reading the document MS by the document reading unit 2 and various management information. ing.

Next, the decoloring ink detection operation in the copying machine 1 of the present embodiment will be described in detail with reference to FIGS.
When the control unit 8 receives an input of a decoloring ink detection instruction from the user through the operation unit 6 (step A1), the control unit 8 sets the decoloring ink detection mode (step A2). Then, the control unit 8 waits for input of a reading instruction by operating the start key (step A3). For example, when accepting documents such as various application forms and resumes in which various information such as name and address is entered, the user verifies whether or not the entered information has been made with decoloring ink. A decoloring ink detection instruction is issued. Then, the user places a document to be verified as to whether or not it has been performed with the erasing ink on the document placing unit 31 as a document MS, and operates the start key to input a reading instruction.

  When the control unit 8 receives an input of a reading instruction in step A3, the control unit 8 instructs the document feeding unit 3 to feed the document MS, and instructs the document reading unit 2 to perform the decoloring ink detection operation. When reading by the decoloring ink detection operation is instructed, the document reading unit 2 reads the document MS by using the first scanner 21 to acquire original image data (step A4), and also the document MS by the heating roller 23. In step A5, the heated document MS is read by using the second scanner 24, and the heated image data is acquired (step A6).

  The heating process in step A5 is a process for erasing the information written with the decoloring ink on the surface (reading surface) of the original MS. The surface temperature of the original MS is changed by the heating roller 23 so that the decoloring ink is removed. The original MS is heated until the temperature to be erased or higher. The temperature at which the color is erased differs depending on the type of the color-erasable ink. Therefore, it is preferable that the heat generation temperature of the heating roller 23 can be changed by an input from the operation unit 6 and the amount of heat transmitted from the heating roller 23 to the document MS can be adjusted. In this case, the surface temperature of the original MS that is reached by heating with the heating roller 23 can be changed according to the type of decoloring ink. Even if the heat generation temperature of the heating roller 23 is the same, the amount of heat transferred from the heating roller 23 to the document MS changes depending on the feeding speed of the document MS by the document feeding unit 3. Accordingly, the feeding speed of the document MS by the document feeding unit 3 can be changed by an input from the operation unit 6 and the amount of heat transferred from the heating roller 23 to the document MS can be adjusted. Further, in the present embodiment, the heating roller 23 is configured to heat from the surface (reading surface) side of the document MS. Accordingly, the temperature reached by heating by the heating roller 23 is higher on the surface temperature of the document MS (the temperature of the reading surface) than on the back surface temperature of the document MS (the temperature on the opposite surface of the reading surface). Thus, the surface temperature of the document MS is erased by appropriately setting the heat generation temperature of the heating roller 23 and the feeding speed of the document MS by the document feeding unit 3 according to the type of decoloring ink and the paper quality of the document MS. The temperature at which the color ink is erased or higher, the back surface temperature of the original MS can be lower than the temperature at which the color erase ink is erased, and information on which the color erase ink is written is left on the back surface of the original MS Thus, information in which the decoloring ink is written on the surface of the document MS can be decolored.

  Next, the control unit 8 functions as the image data comparison unit 81 and compares the original image data acquired in step A4 and the heated image data acquired in step A6 (step A7), and the original image data and the heated image data are compared. It is determined whether the image data matches (step A8).

  If the original image data and the heated image data match in step A8, the image data comparison unit 81 issues a message notifying that there is no information written in the decoloring ink on the surface of the document MS as a comparison result. The liquid crystal display unit 61 of the operation unit 6 is displayed to notify the user that no decoloring ink has been detected (step A9), and the decoloring ink detection operation is terminated.

  If the original image data and the heated image data do not match in step A8, the image data comparison unit 81 has information written with decoloring ink on the surface of the document MS as a comparison result. A message notifying that the color has been erased is displayed on the liquid crystal display unit 61 of the operation unit 6 to notify the user of the detection of the color erased ink (step A10). In the original image data shown in FIG. 5A acquired in step A4, when the address entered in the address column 91 and the name entered in the name column 92 are those using decoloring ink, The address entered in the address field 91 and the name entered in the name field 92 are erased by the heat treatment in step A5. In step A6, the address field 91 and the name field 92 are displayed as shown in FIG. Image data after heating in which is blank is acquired. As a result, in step A8, it is detected that the original image data and the image data after heating do not match, and there is information written in the decoloring ink on the surface of the original MS. Note that the notification of the comparison result in step A9 and step A10 may be notified by sound using an audio output means.

  Next, the control unit 8 functions as the original document print data generation unit 82, generates original document print data based on the original image data (step A11), and the generated original document print data is recorded on the recording paper by the recording unit 7. Printing is performed (step A12), and the decoloring ink detection operation is terminated.

  Based on the original image data, the original document print data generation unit 82 generates original document print data that emphasizes a portion that does not match the post-heating image data. In FIG.5 (c), the emphasis process was performed by the bold process which thickens the line width of the address entered in the address column 91 and the name entered in the name column 92, which are inconsistencies with the image data after heating. Original document print data A is shown. Note that the emphasis process is not limited to the bolding process, and an enlargement process for enlarging a mismatched part, a color changing process for changing the color of the mismatched part, a marking process for underlining or the like may be performed. In addition, as a process for emphasizing a mismatched portion, a mismatched portion may be cut out and itemized as in the original document print data B shown in FIG. In this case, as in the original document print data B shown in FIG. 5D, the reduced post-heating image data is used to clearly indicate the places where the inconsistent portions are entered with identification symbols (serial numbers, etc.). Is preferred.

As described above, the present embodiment is a document reading device (document reading unit 2) that reads a document MS fed by a document feeding unit 3, and reads the document MS to acquire original image data. A first scanner 21 that is one reading unit, a heating roller 23 that is a heating unit that performs a heating process of applying heat to the document MS to decolorize the decolored ink, and a document MS that has been heated by the heating roller 23. A second scanner 24 as second reading means for acquiring post-heating image data, an image data comparison section 81 as image data comparison means for comparing original image data and post-heating image data, and image data comparison section 81. And an operation unit 6 (liquid crystal display unit 61) which is a comparison result notifying means for notifying of the comparison result.
With this configuration, when information is written in the original MS with the color erasing ink, the color erasing ink is erased by the heat treatment by the heating roller 23. Therefore, by comparing the original image data with the post-heating image data from which the color-erasing ink is erased, it is possible to easily verify whether or not the entered information has been performed by the color-erasing ink.

Furthermore, the present embodiment can also include a heating amount changing unit that changes the amount of heat transmitted from the heating roller 23 to the document MS. The change in the amount of heat transmitted from the heating roller 23 to the document MS is configured such that, for example, the heat generation temperature of the heating roller 23 can be changed by an input from the operation unit 6. In addition, the feeding speed of the document MS by the document feeding unit 3 may be changed by an input from the operation unit 6.
With this configuration, it is possible to change the surface temperature of the document MS that is reached by heating with the heating roller 23 according to the type of decoloring ink.

Further, in the present embodiment, the heating roller 23 is configured to heat the document MS from the reading surface side of the document MS read by the first scanner 21 and the second scanner 24.
With this configuration, the temperature reached by heating by the heating roller 23 can be lower than the surface temperature of the document MS (the temperature of the reading surface) and the back surface temperature of the document MS (the temperature of the surface opposite to the reading surface). As a result, the temperature of the heating roller 23 and the feeding speed of the document MS by the document feeding unit 3 are appropriately set according to the type of the decoloring ink and the paper quality of the document MS, thereby erasing the back surface of the document MS. The information on which the decoloring ink is written on the surface of the original MS can be erased while the information on which the ink is written is left.

Furthermore, the present embodiment is a copying machine 1 having a document reading unit 2, and when it is determined by comparison by the image data comparison unit 81 that the original image data and the heated image data do not match, the original image data An original document print data generation unit 82 that is an original document print data generation unit that generates original document print data indicating a portion that does not match the post-heating image data, and an original document generated by the original document print data generation unit 82 A recording unit 7 is provided as output means for outputting print data.
With this configuration, by referring to the original manuscript print data, it is possible to easily re-enter the manuscript MS from which the color erasing ink has been erased.

Furthermore, in the present embodiment, the original document print data generation unit 82 is configured to generate original document print data that emphasizes a portion that does not match the post-heating image data.
With this configuration, it is possible to easily grasp the location and contents where the color erasing ink has been erased, and it is possible to more easily re-enter the original MS from which the color erasing ink has been erased.

Note that the present invention is not limited to the above-described embodiments, and it is obvious that the embodiments can be appropriately changed within the scope of the technical idea of the present invention. In addition, the number, position, shape, and the like of the constituent members are not limited to the above-described embodiment, and can be set to a number, position, shape, and the like that are suitable for implementing the present invention. In each figure, the same numerals are given to the same component.
For example, in this embodiment, two scanners, a first scanner 21 that reads a document MS and acquires original image data, and a second scanner 24 that reads the heated document MS and acquires heated image data. However, it is also possible to circulate the document MS after the heat treatment, read the document after the heat treatment by the first scanner 21, and acquire post-heating image data. That is, the first scanner 21 and the second scanner 24 can be configured by the same scanner.
In the present embodiment, the original document print data generated by the original document print data generation unit 82 is configured to be printed on a recording paper and output. It may be displayed on a display device and output.

DESCRIPTION OF SYMBOLS 1 Copier 2 Original reading part 3 Original feeding part 5 Main body part 6 Operation part 7 Recording part 8 Control part 9 Image processing part 10 Memory | storage part 21 1st scanner 22 1st original reading slit 23 Heating roller 24 2nd scanner 25 2nd 2 Document reading slit 26 Platen glass 31 Document placement section 32 Document discharge tray 33 Document feeding mechanism 34 Pickup roller 35 Document feeding roller 36 Registration roller 37 First document pressing section 38 Document pressing roller 39 Second document pressing section 40 Document Discharge roller 51 Recording paper discharge tray 52 Paper feed section 52a1 to 52an Paper feed cassette 52b1 to 52bn Recording paper feed roller 53 Recording paper transport path 54 Recording paper transport roller 55 Recording paper discharge roller 61 Liquid crystal display section 62 Operation button 71 Photoconductor Drum 72 Exposure unit 73 Image forming section 74 Transfer section 75 Fixing section 81 Image data comparison section 82 Original document print data generation section 91 Address field 92 Name field

Claims (6)

A document reading device that reads a document fed by a document feeding unit,
First reading means for reading the original and acquiring original image data;
Heating means for erasing the decolored ink by performing a heat treatment for applying heat to the original;
A second reading means for reading the original document after the heat treatment by the heating means and acquiring post-heating image data;
Image data comparison means for comparing the original image data and the image data after heating;
A document reading apparatus comprising: a comparison result notifying unit for notifying a comparison result by the image data comparing unit.   2. The document reading apparatus according to claim 1, further comprising a heating amount changing unit that changes a heat amount transmitted from the heating unit to the document.   3. The document reading apparatus according to claim 1, wherein the heating unit heats the document from a reading surface side of the document read by the first reading unit and the second reading unit. An image forming apparatus comprising the document reading device according to claim 1,
If it is determined by the comparison by the image data comparison means that the original image data and the heated image data do not match, the original document print data indicating a mismatched portion with the heated image data based on the original image data Original document print data generation means for generating
An image forming apparatus comprising: an output unit that outputs the original document print data generated by the original document print data generation unit.   The image forming apparatus according to claim 4, wherein the original document print data generation unit generates the original document print data in which a mismatched portion with the image data after heating is emphasized.   The image forming apparatus according to claim 5, wherein the comparison result notifying unit notifies the non-detection of the decolored ink when the original image data and the post-heating image data match.

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