JP2005286586A - Original reader - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid deteriorating the read accuracy of image information due to contamination of the reading surface of an original platen by cleaning the reading surface. <P>SOLUTION: An engaging member 20a is disposed on the upside of a first scanner 13 for irradiating an original from below a platen glass 11b to reflect the image light of an original to a second scanner 14 and engaged with an engaging member 20b supporting slidably the platen glass 11b, thereby moving the platen glass 11b with the moving of the first scanner 13 from an original reading position S1 to a position where a cleaning means 30 is disposed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an original reading apparatus used for an image input apparatus such as a copying machine or a scanner.

  The document image reading method of the document reading apparatus is roughly divided into an optical unit on the other surface side facing the reading surface of the document mounting table with respect to the document placed on the reading surface of the transparent document mounting table. A document fixing method for reading image information by exposing a document using a light source provided therein while moving the document, and a predetermined document reading position on the other side facing the reading surface of the document table, on the document conveyance path There is a document moving method in which image information is read by exposing a document conveyed at a predetermined speed onto a reading surface of a document placing table constituting a part of the document by a light source.

  The document moving type document reading apparatus automatically conveys a plurality of documents placed on a document placing tray etc. one by one onto the reading surface of the document placing table, and reads the image information of the document. The user does not have to place the originals one by one on the original placement table as in the case of the original document reading apparatus.

  However, since the document moving type document reading apparatus passes the document on the reading surface of the document table at a predetermined speed, the unfixed material adhering to the document when the reading surface contacts the document. For example, there has been a problem that undried ballpoint pen ink, undried correction liquid or the like adheres to the reading surface and stains the reading surface. For this reason, the read image information has image defects that include so-called noise such as black spots and black streaks due to contamination of the reading surface. If such a state is left unattended, an image defect will occur in the image information of the read original document over several or several tens of pages until the contamination of the reading surface is removed.

  Normally, the user simply places a document on a document placing tray or the like and inputs a document reading start request, and does not check whether the reading surface is soiled. For this reason, for example, when performing FAX transmission, the image information of the document is transmitted to the other party including image defects, and the image formed on the paper or the like based on the transmitted image information is difficult to see. turn into.

  On the other hand, in the case of a document fixing type document reading apparatus, the document is placed on the document table one by one, so that the user can check the reading surface when placing the document on the document table, and the reading surface is soiled. Even if this occurs, the user can immediately notice and remove it. Therefore, the above problems are unlikely to occur.

  Therefore, a conventional document moving type document reading apparatus has a configuration in which the reading surface is prevented from being polluted by conveying the document in a state of being slightly lifted from the reading surface of the document table (for example, Patent Documents). 1). In the above-mentioned Patent Document 1, as shown in FIG. 5, the step forming member 102 is arranged on the reading surface A of the document table 100 so that the document P conveyed from the document conveying path R is floated above the reading surface A. A configuration for reading image information of a document at the document reading position S is disclosed. Further, as shown in FIG. 6, a sheet suction member 104 for sucking the document P is arranged so as to face the document reading position S, and the document P is lifted from the reading surface A and the image information of the document is read at the document reading position S. A configuration is also disclosed.

Further, a correction for detecting contamination on the reading surface of the document table by using a document reading unit that reads image information of the document, and removing image information due to the contamination of the reading surface included in the image information of the document to be read thereafter. There is also a configuration that performs (see, for example, Patent Document 2).
Japanese Patent No. 3134773 JP 2003-319175 A

  However, in the configuration of Patent Document 1 described above, since the type of document is not taken into consideration, there is a possibility that the document cannot be conveyed in a state of being completely lifted from the reading surface. In the configuration using the step forming member 102 shown in FIG. 5, for example, when a thin document is conveyed to the reading surface, the leading end side and the trailing end side in the document conveying direction come into contact with the reading surface of the document table. there is a possibility. Further, in the configuration using the sheet suction member 104 shown in FIG. 6, there is a possibility that the document cannot be completely lifted from the reading surface even if the heavy document is sucked by the sheet suction member 104. is there. Therefore, there is a possibility that the reading surface is soiled by contact with the document.

  Further, even if the original is completely lifted from the reading surface and conveyed, paper dust or the like generated by the conveyance of the original may adhere to the reading surface. In particular, since the document moving method can automatically read a large number of documents, the frequency of use is higher than that of a fixed-type document reading apparatus, and paper dust or the like generated by document conveyance is likely to occur.

  In the configuration of Patent Document 2, image information due to contamination included in image information of a document read by correction is removed, but it is difficult to correct image information when the reading surface is severely stained. It is. In addition, the correction control is complicated.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a document reading apparatus that can prevent a decrease in reading accuracy of image information due to contamination of the reading surface by cleaning the reading surface of the document table.

  In order to solve the above problems, the present invention has the following configuration.

(1) A transparent document placing table, and a document reading unit that reads image information of a document moving on the reading surface of the document placing table at a predetermined speed from the other side facing the reading surface of the document placing table. In the provided document reading device,
Moving means for moving the document table in a direction perpendicular to the main scanning direction of the document and parallel to the reading surface;
And cleaning means for cleaning the reading surface of the document table moved by the moving means.

  In this configuration, the image information of the document conveyed on the reading surface of the document mounting table is read via the document mounting table by the document reading means located on the other side. Further, the reading surface of the document table that has been moved in the document transport direction on the reading surface by the moving means is cleaned by the cleaning means.

(2) The document reading means is movable in a direction perpendicular to the main scanning direction of the document and parallel to the reading surface,
The moving means includes a transmission mechanism that transmits the moving force of the document reading means to the document placing table, and a return means that biases the document placing table in a direction opposite to the moving direction of the document reading means. It is characterized by that.

  In this configuration, the moving force of the document reading means whose action direction is parallel to the moving direction of the document table is transmitted to the document table via the transmission mechanism. Further, the document placing table is always urged in the direction opposite to the direction of the movement of the document reading means by the returning means. Accordingly, the document placing table is moved and cleaned by the moving force of the document reading unit, and when the moving force of the document reading unit is not transmitted, the original table is returned to the original position by the urging force by the returning unit.

  (3) The return means is an elastic member.

  In this configuration, since the return means for urging the document placement table in the direction opposite to the direction of action of the moving force of the document reading means is formed of an elastic member, the configuration is not complicated.

(4) The document reading means moves in the direction of the document reading position when reading the document from a home position that is positioned when the image information of the document is not read,
The cleaning unit is located on the side of the original reading position with respect to the home position, and is further away from the home position than the original reading position.

  In this configuration, the cleaning unit is on the side of the document reading position with respect to the home position, and the distance from the home position is greater than the document reading position. Therefore, when transmitting the moving force of the document reading means moving from the home position to the document reading position during document reading to the document placement table via the transmission mechanism, the direction in which the document should be moved and the direction of movement of the document reading means Are parallel to each other, so that a moving force acting in the same direction as the direction in which the document table is to be moved is easily transmitted. In addition, since the position of the cleaning unit is farther from the home position than the document reading position, the moving force of the document reading unit that overruns the document reading position over the position of the cleaning unit is transmitted. In this case, since the movement of the document reading means from the document reading position to the arrangement position side of the cleaning means is only a movement for moving the document placing table, the configuration of the transmission mechanism is not complicated.

  (5) The reading unit transmits a moving force that moves beyond the document reading position toward the arrangement position of the cleaning unit to the document table via a transmission mechanism.

  In this configuration, since the moving force when the document reading unit overruns the document reading position is transmitted to the document mounting table, the movement of the document reading unit from the document reading position to the arrangement position side of the cleaning unit is not performed on the document mounting. The movement is only for moving the pedestal, and the configuration of the transmission mechanism is not complicated. For example, when the document reading unit overruns the document reading position, the engaging member that engages with the document mounting table is used as a transmission mechanism to move the document mounting table. Therefore, the configuration of the transmission mechanism does not become complicated.

  (6) The cleaning unit is configured by a brush or a felt arranged at a position in contact with the reading surface of the document table moved by the moving unit.

  In this configuration, since the cleaning means is constituted by the brush or felt arranged at a position in contact with the reading surface of the document table moved by the moving means, the brush or felt is placed on the reading surface of the moving document table. The reading surface is rubbed by contact.

  (7) The image forming apparatus includes a control unit that operates the moving unit immediately before the reading of the image information of the document.

  In this configuration, the reading surface of the document placing table is cleaned immediately before the start of reading the image information of the document.

  (8) Control means for operating the moving means immediately after the reading of the image information of the original is completed.

  In this configuration, cleaning is performed immediately after the reading of the image information of the document.

(9) Detecting the presence or absence of contamination on the reading surface of the document mounting table at the document reading position based on image information read by the reading unit without the document on the document mounting table at the document reading position. A detection means,
Control means for operating the moving means based on a result detected by the detecting means is provided.

  In this configuration, the presence or absence of contamination attached to the reading surface at the document reading position is detected from the image information on the reading surface read by the document reading means. Further, cleaning is performed according to the presence or absence of contamination.

  According to the present invention, the following effects can be obtained.

  (1) By moving the document placing table and cleaning the reading surface, it is possible to reliably prevent the reading surface from being stained without imposing a burden on the user, and to maintain the reading accuracy of the image information of the document.

  (2) By transmitting the moving force of the document reading means to move the document placing table, it is not necessary to provide the driving means in the moving means, and the configuration of the moving means can be simplified, thereby suppressing an increase in cost. it can.

  (3) Since the return means can be configured simply by configuring the return means with an elastic member, an increase in cost can be suppressed. In addition, the document placing table moved by the reaction force of the elastic member can be easily returned to the original position, and it is possible to prevent the occurrence of JAM during document transportation and the scattering of dust and the like to the document reading means.

  (4) By arranging the cleaning unit at a position closer to the document reading position than the home position and at a distance from the home position, the structure of the transmission mechanism can be simplified, thereby suppressing an increase in cost. be able to.

  (5) By transmitting the moving force at the time of overrunning the document reading position of the document reading unit to the document placing table, the configuration of the transmission mechanism can be further simplified, and the cost increase can be reduced.

  (6) Since the cleaning means is composed of a brush or felt that abuts on the reading surface of the moved document table, the brush or felt can abut on the reading surface of the moving document table and can rub the reading surface. The reading surface can be easily cleaned with a simple configuration using the moving force applied to the document table. Further, since the cleaning means is constituted by a relatively inexpensive brush or felt, it is possible to suppress an increase in cost.

  (7) By cleaning the reading surface of the document table immediately before the start of reading the image information of the document, the image information of the document can be read in a state where the contamination of the reading surface is removed. Can be read accurately.

  (8) The dirt on the original is difficult to be removed by drying after the adhering time, and in particular, the ink and correction liquid of the ballpoint pen are difficult to remove if they are dried and fixed. By performing the cleaning immediately after the reading is completed, it is possible to easily remove the dirt attached immediately after the document passes the reading surface of the document table.

  (9) By cleaning the reading surface when the reading surface of the document placing table at the document reading position is contaminated, it is possible to save unnecessary time and frequency of cleaning as much as possible. Thereby, an increase in the reading time of the image information of the original can be suppressed, and the life of the cleaning unit can be extended.

  Hereinafter, an image forming apparatus according to the best embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a sectional view showing a simple configuration of a document reading apparatus according to an embodiment of the present invention. The document reading apparatus 1 is incorporated in a digital copying machine in this embodiment. The digital copying machine forms an image on a recording medium based on image information of a document read by the document reading device 1 or based on an image formation request signal received from a connected network.

  The document reading apparatus 1 according to the present invention includes platen glasses 11a and 11b, an automatic document feeder 12, a first scanning body 13, a second scanning body 14, a reading optical unit 15, and the like. The platen glasses 11a and 11b arranged below the automatic document feeder 12 are made of transparent glass. The automatic document feeder 12 automatically feeds a document stored on a document placement tray 12a onto a platen glass (corresponding to a document placement table of the present invention) 11b. When a plurality of originals are placed on the original placement tray 12a, the originals are fed one by one onto the platen glass 11b.

  The first scanning body 13 includes an exposure lamp 13a and a first reflecting mirror 13b provided in the frame 13F. The exposure lamp 13a exposes a document placed on the platen glass 11a or a document transported on the platen glass 11b by the automatic document transport device 12. The first reflecting mirror 13b causes image light reflected from the document to enter a second reflecting mirror described later.

  The second scanning body 14 includes a second reflecting mirror 14a and a third reflecting mirror 14b provided in the frame 14F. The second reflection mirror 14a reflects the image light incident from the first reflection mirror 13b and causes the image light to enter the third reflection mirror 14b. The third reflection mirror 14 b reflects the image light incident from the second reflection mirror 14 a and causes the image light to enter the imaging lens 15 a constituting the reading optical unit 15. The reading optical unit 15 includes an imaging lens 15a, a CCD (Charge Coupled Device) 15b, and the like, and reads image light from a document. The imaging lens 15a focuses the image light incident from the third reflecting mirror 14b on the CCD 15b. The CCD 15b photoelectrically converts the received image light.

  When the original surface of the original placed on the platen glass 11a is read, the first scanning body 13 is moved at a predetermined moving speed V along the surface direction of the platen glass 11a by a driving means described later, and the exposure lamp 13a. Exposes the document surface. At this time, the second scanning body 14 is moved along the surface direction of the platen glass 11 a at a moving speed V / 2 in conjunction with the movement of the first scanning body 13, and the original surface incident from the first scanning body 13. Is incident on the imaging lens 15a. The reason why the moving speed of the second scanning body 14 is set to V / 2 with respect to the moving speed V of the first scanning body 13 is that the optical path length of the optical path M from the document surface to the CCD 15b is kept constant and the image light is accurately transmitted. This is for receiving light.

  On the other hand, when reading a document stored in the document placing tray 12a of the automatic document feeder 12, the first scanning body 13 is stationary at a predetermined document reading position S1 shown in FIG. A document fed at a predetermined speed is exposed on the platen glass 11b facing the first scanning body 13 via the top. The exposed document is placed on the paper discharge tray 12b. At this time, the image light from the first scanning body 13 is incident on the imaging lens 15a while the second scanning body 14 is also stationary at the document reading position S2.

  In the document reading device 1, a shading correction plate 18 is disposed so as to face the platen glass 11b with the platen glass 11a interposed therebetween. The shading correction plate 18 is used when performing known shading correction.

  The first scanning body 13 and the second scanning body 14 stand by at the home positions H1 and H2 below the shading correction plate 18 when the image information of the original is not read.

  FIG. 2 is an enlarged cross-sectional view of a part of the document reading apparatus according to the embodiment of the present invention. FIG. 2A shows a state where the first scanning body 13 and the second scanning body 14 read the image information of the document conveyed at a predetermined speed on the reading surface A of the platen glass 11b at the document reading positions S1 and S2. Indicates. FIG. 2B is a diagram showing a state in which the first operating body 13 has overrun to the right end of the drawing beyond the document reading position S1.

  As shown in FIG. 2, the first scanning body 13 includes an engaging member 20a on the side of the frame 13F facing the platen glass 11b. The platen glass 11a includes engaging members 2b at both ends in a direction orthogonal to the main scanning direction. The engaging members 20a and 20b correspond to the transmission mechanism of the present invention. The platen glass 11b is slidably supported in parallel with the moving direction of the first scanning body 13 by the engaging member 20b. Furthermore, a cleaning means 30 is provided on the right side of the drawing of the platen glass 11b. The cleaning unit 30 includes a brush 31 and the like, and cleans the reading surface A of the platen glass 11b.

  When reading the image information of the document placed on the document placement tray 12a, the first scanning body 13 and the second scanning body 14 that have been waiting at the home positions H1 and H2 move toward the document reading positions S1 and S2. Start moving. At this time, the second scanning body 14 stops at the original reading position S2, but the first scanning body 13 overruns the original reading position S1 and moves to the arrangement position of the cleaning means 30 as shown in FIG. To do.

  At this time, the engaging members 20 a and 20 b are engaged, and the platen glass 11 b moves in parallel with the moving direction of the first scanning body 13 as the first scanning body 13 moves. Further, since the brush 31 is arranged in the moving direction of the platen glass 11b, the reading surface A is rubbed by the brush 31 with the movement of the platen glass 11b, and the stain on the reading surface A is removed.

  Thereby, the image information of the original can be read in a state where the contamination on the reading surface A is removed, so that the image information of the original can be read accurately.

  Further, the control of the operation of overrunning the first scanning body 13 is performed by the control unit 50 driving the driving unit 40 via the driver 41. The control unit 50 drives the driving means 40 via the driver 41 to control the moving operation of the second scanning body 14 that moves in conjunction with the first scanning body 13 and the first scanning body 13.

  It should be noted that the scanning surface A may be cleaned by overrunning the first scanning body 13 immediately after the reading of the document image information, or may be performed both immediately before the reading of the document image information and immediately after the reading. By performing the process immediately after the image information of the original is read, the dirt attached immediately after the original passes through the reading surface A can be easily removed. This is because the dirt is difficult to be removed by drying after time has passed. In particular, ball-point pen ink, correction liquid, and the like are difficult to remove once they are dried and fixed.

  Alternatively, it may be performed when stain occurs on the reading surface A. For example, image information of the reading surface A that is not contaminated and read using the first scanning body 13, the second scanning body 14, and the reading optical unit 15 is previously stored and stored. The controller 50 compares the image information of the reading surface A read immediately before reading the image information of the document with the image information of the reading surface A stored in the storage means. If it is determined by comparison that there is contamination, the platen glass 11b is moved for cleaning. If it is determined that there is no contamination, no cleaning is performed. In this example, the control unit 50 corresponds to the detection means of the present invention.

  Thereby, useless time and the frequency | count of cleaning can be saved as much as possible. Accordingly, it is possible to suppress an increase in the reading time of the image information of the document, and to extend the life of the cleaning unit 30.

  Thereafter, the first scanning body 13 starts moving to the document reading position S1. At this time, the engaging portions 20a and 20b are disengaged, but the elastic force of the elastic member 21 (in this embodiment, a spring is used) which is the returning means of the present invention abutted against the platen glass 11b. As a result, the platen glass 11b also returns to the original position shown in FIG.

  The brush 31 is configured to be detachable and can be replaced when the removed dirt has accumulated. Further, the cleaning unit 30 is disposed on the side of the document reading position S with respect to the home position H, and at a position farther from the home position H than the document reading position S. Any position may be used as long as it can realize a configuration capable of transmitting the moving force of the document reading means such as the scanning body 13 and the second scanning body 14 to the platen glass 11b.

  As described above, since the moving force when the first scanning body 13 serving as the document reading unit overruns the document reading position S1 is transmitted to the platen glass 11b, the engagement members 20a and 20b and the elastic member 21 are simply configured. The platen glass 11b can be moved with a simple structure, and the cost increase can be reduced. The engaging members 20a and 20b and the elastic member 21 constitute the moving means of the present invention.

  With the configuration described above, it is possible to reliably prevent the reading surface A from being soiled without imposing a burden on the user, and to maintain the reading accuracy of the image information of the document.

  Further, since the moving force of the first scanning body 13 is transmitted to move the platen glass 11b, there is no need to provide a new driving means for moving the platen glass 11b, and the structure of the moving means can be simplified. , Cost increase can be suppressed.

  Furthermore, since the return means of this invention is comprised using the elastic member 22, a return means can be made a simple structure, and a cost increase can be suppressed. Further, it is possible to easily return the platen glass 11b moved by the reaction force of the elastic member 22 to the original position, and it is possible to prevent occurrence of JAM during document conveyance and scattering of dust and the like to the reading optical unit 15.

  In addition, since the cleaning means 30 is configured by the brush 31 that contacts the reading surface A of the moved platen glass 11a, the brush 31 can contact the reading surface A of the moving platen glass 11a and rub the reading surface. The reading surface A can be easily cleaned with a simple configuration using the moving force applied to the platen glass 11b. Moreover, since the cleaning means 30 is configured using a relatively inexpensive brush 31, it is possible to suppress an increase in cost. In addition, the same effect can be acquired even if it uses not only a brush but felt.

  Further, in the embodiment of the present invention, the platen glass 11b is moved by using the moving force of the first scanning body 13. However, the present invention is not limited to this, and any moving means for moving the document may be used. .

  For example, there is a configuration including a moving means 70 as shown in FIG. The moving unit 70 includes a driving unit 71, a shaft 72, a cam 73, an endless belt 74, an abutting member 75, and the like. The driving unit 71 is controlled by the control unit 50 via the driver 42 and transmits a driving force for moving the platen glass 11 b to the shaft 72. The shaft 72 is rotatable, and transmits the driving force from the driving means 71 to the cam 73 by rotating the endless belt 74. The cam 73 rotates in the direction of the arrow shown in FIG. 3 by the endless belt 74, converts the driving force of the driving means 71 into a force in the document transport direction on the reading surface A, and transmits it to the contact member 75. The contact member 75 is slidable, supports the platen glass 11 b, and moves in parallel with the conveyance direction of the document on the reading surface A by the driving force transmitted from the cam 73. Accordingly, the platen glass 11b also moves.

  Further, there is a configuration provided with 80 moving means as shown in FIG. The moving unit 80 includes a driving unit 81, a shaft 82, a driven roller 83, an endless belt 84, a support member 85, and the like. The driving unit 81 is controlled by the control unit 50 via the driver 43 and transmits a driving force for moving the platen glass 11 b to the shaft 82. The shaft 82 is rotatable and transmits the driving force from the driving means 81 to the support member 85 by rotating the endless belt 84. The driven roller 83 is driven by the rotation of the endless belt 84. The support member 85 is slidable, supports the platen glass 11b, and is fixed to the endless belt 84 at the protrusion 85a. Therefore, the support member 85 moves in parallel with the conveyance direction of the document on the reading surface A by the rotation of the endless belt 84. Accordingly, the platen glass 11b also moves.

  As in the above example, by providing the moving means 70 and 80 for moving the platen glass 11b, the burden on the user is the same as in the configuration for moving the platen glass 11b using the moving force of the first scanning body 13 described above. Therefore, it is possible to reliably prevent the reading surface A from being soiled and maintain the reading accuracy of the image information of the document.

  In the embodiment of the present invention, the document reading device 1 incorporated in the digital copying machine is described. However, the present invention is not limited to this, and the document reading device such as a scanner device or a facsimile device may be used. Good.

1 is a cross-sectional view showing a simple configuration of a document reading apparatus according to an embodiment of the present invention. FIG. 3 is an enlarged cross-sectional view of a part of the configuration of the document reading apparatus. FIG. 3 is an enlarged cross-sectional view of a part of the configuration of the document reading apparatus. FIG. 3 is an enlarged cross-sectional view of a part of the configuration of the document reading apparatus. It is sectional drawing to which the structure of a part of conventional document reading apparatus was expanded. It is sectional drawing to which the structure of a part of conventional document reading apparatus was expanded.

Explanation of symbols

1-original reading device 11b-platen glass 13-first scanning body 14-second scanning body 15-original reading section 20a, 20b-engaging member 21-elastic member 30-cleaning means 31-brush 50-control section 70- Moving means 80-Moving means A-Reading surface S1, S2-Original reading position H1, H2-Home position

Claims (9)

A document comprising: a transparent document placing table; and a document reading unit that reads image information of a document moving on the reading surface of the document placing table at a predetermined speed from the other side facing the reading surface of the document placing table. In the reader,
Moving means for moving the document table in a direction perpendicular to the main scanning direction of the document and parallel to the reading surface;
A document reading apparatus comprising: cleaning means for cleaning a reading surface of the document table moved by the moving means. The document reading means is movable in a direction perpendicular to the main scanning direction of the document and parallel to the reading surface;
The moving means includes a transmission mechanism that transmits a moving force of the document reading means to the document placing table, and a return means that biases the document placing table in a direction opposite to the moving direction of the document reading means. The document reading apparatus according to claim 1, wherein:   The document reading apparatus according to claim 2, wherein the return unit is an elastic member. The document reading means moves in the direction of the document reading position when reading a document from a home position that is positioned when reading of image information of the document is not performed,
3. The document reading apparatus according to claim 2, wherein the cleaning unit is located on the document reading position side with respect to the home position, and is separated from the home position by the distance from the document reading position.   5. The document reading device according to claim 4, wherein the reading unit transmits a moving force that moves beyond the document reading position toward the arrangement position of the cleaning unit to the document table via a transmission mechanism. apparatus.   2. The document reading apparatus according to claim 1, wherein the cleaning unit is configured by a brush or a felt arranged at a position in contact with a reading surface of the document table moved by the moving unit.   2. The document reading apparatus according to claim 1, further comprising a control unit that operates the moving unit immediately before reading of image information of the document.   The document reading apparatus according to claim 1, further comprising a control unit that operates the moving unit immediately after the reading of the image information of the document. Detection means for detecting whether the reading surface of the document table at the document reading position is soiled based on image information read by the reading unit without the document on the document table at the document reading position; Prepared,
The document reading apparatus according to claim 1, further comprising a control unit that operates the moving unit based on a result detected by the detection unit.

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