JP2004104451A - Image reading apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image reading apparatus in which an original is conveyed to a reading means used only in the case of reading both surfaces of the original only at both surfaces reading time, in the reading apparatus which has two reading means and which can read both the surfaces of the original. <P>SOLUTION: A sub-carriageway combined with a main carriageway used for one side surface reading operation of the original is provided, and a CIS 50 and a feed roller 52 are arranged on the sub-carriageway. The original conveyed to the main carriageway is once stopped on the way, the original is conveyed in a reverse direction after a switching guide 54 is switched, and conveyed to the sub-carriageway. The conveyed original is once introduced to an original tray for both the surfaces of an upper cover 56, is again conveyed, its upper surface is read by the CIS 50, its lower surface is read by charge coupled devices, and both the surfaces are thus read. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image reading apparatus capable of reading both sides of a document, which is applicable to an image forming apparatus such as a copying machine and a facsimile machine.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an image forming apparatus having an automatic document feeder (ADF) has a sheet fixing type in which a document is conveyed by a conveyance belt and positioned on a platen glass, and a scanner moves below the platen glass to read the document. A sheet-through type is known in which a scanner is stopped below a platen glass and a document is read while the document is conveyed on the platen glass at a constant speed.
[0003]
When scanning both sides of a document, the fixed sheet type temporarily stops the document on the platen glass.To scan both sides, it is necessary to reverse the document and then stop the document again. However, there is a drawback. In the sheet-through type, for example, as described in Patent Literature 1, two reading units are disposed on both sides of a transport path on which a document is transported, and the front and back surfaces of the document are transported once. Reading has been done. By doing so, the number of reading means increases, but the document is conveyed only once, and the reading processing time can be shortened.
[0004]
A conventional image reading apparatus using two such reading means has the advantage of shortening the reading processing time, but has a portion which is set at a narrow interval between the reading means and the platen in the document transport path. Since the number of papers has increased to two places, the occurrence of jams during document conveyance naturally increases, and dirt such as paper dust generated when the document is conveyed adheres to the two reading units. Need to be performed.
[0005]
In order to cope with such a problem, for example, in Patent Document 2, by rotating a white guide roller disposed opposite to a reading surface of an image sensor for reading an original, a white reference surface is set only when image correction is required. It is described that the white reference surface is opposed to the reading surface, and the guide surface is opposed to the other surface when the original is conveyed to prevent the white reference surface from being stained.
[0006]
In consideration of the frequency of the single-sided reading operation and the double-sided reading operation, since the single-sided reading operation is overwhelmingly large, the second reading unit is used between the first reading unit used for the single-sided reading and the second reading unit used for the double-sided reading Despite the low frequency, it is inevitable that dirt such as paper dust always adheres and the reading surface deteriorates.
[0007]
[Patent Document 1]
JP-A-1-194658 [Patent Document 2]
JP 2001-313794 A
[Problems to be solved by the invention]
However, considering the frequency of the one-sided reading operation and the two-sided reading operation, the number of the one-sided reading operations is overwhelmingly large. In the case where the second reading unit is provided, it is inevitable that the second reading unit is constantly used with dirt such as paper dust and the reading surface is deteriorated even though the use frequency is low.
[0009]
Therefore, the present invention relates to an image reading apparatus provided with two reading means and capable of reading both sides of an original, wherein the reading means used only for double-sided reading includes an image reading apparatus which conveys the original only during double-sided reading. It is intended to provide.
[0010]
[Means for Solving the Problems]
An image reading apparatus according to the present invention includes: a main transport unit that transports a document in a main transport path; a first reading unit that is disposed in the main transport path and reads one side of the document; A sub-transporting unit that conveys the document in a sub-conveying path that merges with the main conveying path on an upstream side; a second reading unit that is disposed in the sub-conveying path and reads the other surface of the document; A single-sided reading control unit that is conveyed to the main conveyance path by the main conveyance unit and reads only one side of the document by the first reading unit, and the sub conveyance unit and the main conveyance unit that convey the document by the sub conveyance unit and the main conveyance unit. A double-sided reading control unit is provided for reading the both sides of the document by the first and second reading units while being conveyed to a conveyance path. Further, the double-sided reading control means controls the document to be conveyed to the main conveyance path by the main conveyance means and to be carried into the sub-conveyance path. A double-sided document tray is provided in the sub-transport path. Further, the double-sided document tray is formed on an inner surface of an upper cover, and is set by opening the upper cover. Further, a detection means for detecting opening and closing of the upper cover is provided, and the double-sided reading control means operates in response to an open state detection signal from the detection means. Further, a drive transmission means for connecting the sub-transport means to the main transport means in conjunction with the opening operation of the upper cover is provided.
[0011]
With the above-described configuration, the second reading unit is arranged in the sub-conveying path, and the original does not pass through the sub-conveying path while the one-sided reading control unit operates. The surface does not get dirty. Further, since the sub-transport path is configured to merge with the main transport path on the upstream side of the first reading unit, both sides of the document can be read by one-time document conveyance, and the reading processing time is substantially the same as that of the related art. It can be maintained.
[0012]
Further, at the time of double-sided reading, if the document is controlled to be conveyed to the main conveyance path by the main conveyance means and carried into the sub conveyance path, the document is conveyed by the main conveyance means from the same document tray as in the one-sided reading operation. be able to.
[0013]
In addition, by arranging the double-sided document tray in the sub-conveyance path, the document once conveyed to the sub-conveyance path can be stably held, and the conveyance operation when reading the double-sided document can be reliably performed. It becomes. If the double-sided document tray is formed on the inner surface of the upper cover, the upper cover is closed and the double-sided document tray is stored except when the double-sided reading operation is performed. Further, if the detection of the opening of the upper cover by the detection unit and the operation of the double-sided reading unit are performed, the operation for performing the double-sided reading can be simplified. Further, if the sub-transporting means is connected to the main transporting means in conjunction with the opening operation of the upper cover, it is not necessary to separately provide a drive source for the sub-transporting means, and the mechanism of the transporting means can be made compact.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments according to the present invention will be described in detail. FIG. 1 is a schematic sectional view of an entire image forming apparatus to which an image reading apparatus according to the present invention can be applied. A document transport unit 1 and a document reading unit 2 for reading a document are arranged above the image forming apparatus, and a recording unit 3 for recording an image, a paper transport unit 4 for transporting a sheet for recording an image, and two feeding units Paper units 5 and 6 are provided.
[0015]
In the document transport unit 1, a document is carried in by a document tray 10, a pickup roller 11, a separate roller 12, and a retard roller 13. That is, the original placed on the original tray 10 is pulled in by the pickup roller 11, and the leading end of the original is sandwiched between the separate roller 12 and the retard roller 13. The separate roller 12 rotates clockwise to operate to pull in the original, but the retard roller 13 also rotates clockwise to operate so as not to pull in the original. One by one is carried in. Next, the document is conveyed while being sandwiched between the feed roller 14 and the press roller 15, and the leading end of the document reaches between the feed roller 16 and the press roller 17 along the guide. Here, when the leading edge of the document is detected by the document detection sensor, the feed roller 16 starts to be transported, and the leading edge of the document is sandwiched between the feed roller 18 and the press roller 19, and the document is transported at a constant speed. . Meanwhile, the original is read by the original reading unit 2 on the platen 23. The document conveyed and read in this manner is conveyed between the discharge roller 20 and the press roller 21 and is conveyed to the document discharge tray 22.
[0016]
In the document reading unit 2, light is emitted from the lamp 24 toward the platen 23, and reflected light from the document is guided to the CCD 25 by a mirror and converted into an electric signal.
[0017]
The recording unit 3 includes a toner container 26, a charging brush 29, a photosensitive drum 30, a transfer roller 31, an exposure head 32, and a fixing roller 33 for recording on a sheet conveyed by the sheet conveying unit 4. First, the surface of the photosensitive drum 30 is uniformly charged by the charging brush 29, and the charged photosensitive drum 30 is exposed by the exposure head 32 according to an image recording signal to form an electrostatic latent image. Next, the toner in the toner container 26 is transferred from the supply roller 27 to the electrostatic latent image formed on the photosensitive drum 30 via the developing roller 28 to be visualized, and is transferred to the surface of the photosensitive drum 30 by the transfer roller 31. Is transferred to a sheet. Then, the transferred toner image is nipped by the fixing roller 33 and the press roller 34, is heated and pressed, and is fixed on the sheet.
[0018]
In the paper transport unit 4, the paper stacked in the paper feed cassette 43 of each of the paper feed units 5 and 6 is pulled in by the pickup roller 35, and is nipped and transported between the feed roller 36 and the press roller 37. The conveyed sheet is conveyed along a sheet guide, is sandwiched between a feed roller 38 and a press roller 39, and is conveyed to the recording unit 3. The paper conveyed to the recording unit 3 is conveyed between the transfer roller 31 and the photosensitive drum 32 to transfer the toner image as described above, and is sandwiched between the fixing roller 33 and the press roller 34 to form the toner image. After being fixed, the sheet is nipped between the discharge roller 40 and the press roller 41 and is carried out to the sheet discharge tray 42.
[0019]
FIG. 2 shows an example of the document feeder 1 when the present invention is applied to the above-described image forming apparatus. In the document conveying path, a switching guide 54 is provided near the feed roller 16 disposed on the upstream side of the document reading unit 2. As will be described later, the switching guide 54 guides a document conveyed while rotating in the vertical direction when performing one-side reading control and two-side reading control of the document. A CIS 50 is disposed adjacent to the switching guide 54, and a white roller 51 is disposed opposite to the CIS 50. The feed roller 52 and the press roller 53 are disposed in parallel with the CIS 50 and the white roller 51. In this example, a white roller facing the CIS 50 is used, but a white plate may be used. Further, instead of the switching guide 54, one of the transport paths may be closed with a flexible elastic piece, for example, a film or the like. By making this film a part of the main transport path, it can also serve as a guide for a document transported in the main transport path.
[0020]
An apparatus cover is provided so as to cover the upper part of the document conveying unit 1, and a part of the apparatus cover is an upper cover 56 having a double-sided document tray formed on the inner surface. And both are attached at substantially equal intervals. The upper cover 56 is attached to a hinge 59 having a rotation axis coaxial with the feed roller 52, and is rotatable. The document detection sensor 60 is provided between the feed roller 16 and the platen 23, and another document detection sensor 61 is provided between the white roller 51 and the feed roller 52.
[0021]
When performing the one-sided reading operation of the document, as shown in FIG. 2, the upper cover 56 is housed in the apparatus cover and is closed. Therefore, the guides 57 and 58 constituting the double-sided document tray are housed inside the apparatus. In the single-sided reading operation mode, the switching guide 54 is rotated downward and set at the position shown in the figure. The document placed on the document tray 10 is first pulled in the direction shown by the arrow (A) by the separate roller 12 and the retard roller 13, and is conveyed while being nipped by the feed roller 14 and the press roller 15. The document is sandwiched between the feed roller 16 and the press roller 17 and transported in the direction shown by the arrow (B) as described above, and the lower surface of the document is read by the CCD 25. Then, the sheet is conveyed between the discharge roller 20 and the press roller 21 and is discharged to the document discharge tray 22 as shown by an arrow (C). As described above, since the original does not pass through the CIS 50 during the one-sided reading operation, dirt such as paper dust does not adhere to the CIS 50.
[0022]
When performing the both-side reading operation of the document, as shown in FIG. 3, when the upper cover 56 is opened, the guides 57 and 58 are set so as to correspond to the nip portions of the feed roller 52 and the press roller 53. You. The state in which the upper cover 56 is opened may be detected by a detection unit such as an optical detection sensor, for example, and automatically switched to the double-sided reading operation mode. Then, when the mode is switched to the double-sided reading operation mode, the switching guide 54 rotates downward and is set at the position indicated by the dotted line in the figure. The document placed on the document tray 10 is pulled in the direction shown by the arrow (D) by the separate roller 12 and the retard roller 13 as in the case of single-sided reading, and is held by the feed roller 14 and the press roller 15. The sheet is conveyed, nipped by the feed roller 16 and the press roller 17, and conveyed in the direction shown by the arrow (E). When the trailing edge of the document is detected by the document detection sensor 60, the transport operation is temporarily stopped. Next, the switching guide 54 is rotated upward and set at the position shown by the solid line in the figure. When the original is conveyed in the reverse direction as shown by the arrow (F) by controlling the driving of the feed rollers 16 and 18, the original passes along the switching guide 54 between the CIS 59 and the white roller, passes through the feed roller 52 and the press roller. As shown by an arrow (G), the sheet is conveyed between guides 57 and 58 which are double-sided document trays. When the document detection sensor 61 detects the trailing edge of the document, the conveyance operation is stopped.
[0023]
Then, as shown in FIG. 4, the feed roller 52 is driven to convey the original conveyed into the double-sided original tray in the direction shown by the arrow (H), and the upper surface of the original is read by the CIS 50. The read original is transported between the feed roller 16 and the press roller 17 along the switching guide 54, and the lower surface of the original is read by the CCD 25 while being transported in the direction shown by the arrow (I). Then, the sheet is conveyed between the discharge roller 20 and the press roller 21 and is conveyed to the document discharge tray 22 as shown by an arrow (J). In this manner, both sides of the document are read simultaneously by one carrying operation.
[0024]
FIG. 5 shows an example of a drive transmission mechanism to the feed roller 52. FIG. 5A is a state diagram of the single-sided reading operation mode, and FIGS. 5B and 5C are state diagrams of the double-sided reading operation mode. A drive gear 70 is fixed to the rotation shaft of the feed roller 16, and the drive gear 70 meshes with an idle gear 71, and the idle gear 71 has a support rotatably attached to the rotation shaft. The idle gears 72 and 73 are supported by the member 75 and mesh with the idle gear 71. The support member 75 is urged by an urging means such as a spring (not shown) to rotate clockwise around the rotation axis of the idle gear 71.
[0025]
On the other hand, a drive gear 74 is fixed to the rotation shaft of the feed roller 52. In addition, a locking member 76 that rotates about the rotation axis of the feed roller 52 in conjunction with the opening and closing operation of the upper cover 56 is provided.
[0026]
As shown in FIG. 5A, in the case of the single-sided reading operation mode, the locking member 76 rotates toward the feed roller 16 and locks the support member 75. By being locked by the locking member 76, the idle gears 72 and 73 attached to the support member 75 remain at positions separated from the drive gear 74. Therefore, the driving force of the feed roller 16 is not transmitted to the feed roller 52. Then, as shown in FIG. 5C, in the double-sided reading operation mode, when the upper cover 56 is opened, the locking member 76 rotates counterclockwise to release the locked state with the support member 75. Is done. Then, the support member 75 is rotated clockwise by the urging means described above, so that the idle gear 73 meshes with the drive gear 74, and the driving force of the feed roller 16 is controlled by the feed roller 52 via the gear group described above. And the document is rotated and the document is conveyed.
[0027]
As shown in FIG. 3, when the document is transported from arrow (F) to arrow (G), the drive gear 70 rotates clockwise because the feed roller 16 rotates clockwise, and the idle gear 71 rotates counterclockwise. To rotate. Therefore, as shown in FIG. 5B, the idle gear 72 moves around the idle gear 71 and meshes with the drive gear 74. Thus, the driving force is transmitted to the driving gear 74, and the feed roller 52 rotates counterclockwise. As shown in FIG. 4, when the document is transported from the arrow (H) to the arrow (I), the feed roller 16 rotates counterclockwise, so that the drive gear 70 rotates counterclockwise, and the idle gear 71 rotates. Rotates clockwise. Then, as shown in FIG. 5C, the driving force is transmitted in a state where the idle gear 73 is engaged with the driving gear 74, and the feed roller 52 rotates clockwise.
[0028]
FIG. 6 shows an outline of a block configuration relating to control of the entire image forming apparatus. In the document transport section 1 and the document reading section 2, detection signals from the document set sensor 80, the document detection sensor 60, the document detection sensor 61, and the upper cover sensor 83 are transmitted to the CPU 84 via the ADF bus and the main body bus. The CPU 84 performs arithmetic processing using a program stored in the ROM 85 or the CODEC 89, and temporarily stores data in the SRAM 86 and the DRAM 87 as necessary. The control signal from the CPU 84 is output to the transport motor 80, the transport clutch 81, the first reading unit (CCD) 25, and the second reading unit (CIS) 50 via the main body bus and the ADF bus. Further, an image signal necessary for image formation and a control signal therefor are output to the recording unit 3. In the operation unit 88, data specified by the operator is input, and an alarm, a message, and the like are displayed.
[0029]
An example in which a single-sided reading operation and a double-sided reading operation of a document are performed in such a configuration will be described with reference to the flowchart shown in FIG.
[0030]
First, the opening / closing of the upper cover 56 is detected (S100), and when the closed state is detected by the upper cover sensor 83, the mode shifts to the single-sided reading mode. When the open state is detected, the mode shifts to the double-sided reading mode. . In the one-sided reading mode, when the document set sensor 82 detects that a document is set on the document tray 10 (S101), the transport clutch 81 is turned on and the transport motor 80 starts (S102). When conveyance of the document is started and the document detection sensor 60 detects the leading edge of the document and is turned ON (S103), the CCD 25 starts a reading operation (S104). When the document is conveyed and one side is read and the document detection sensor 60 detects the trailing end of the document and is turned off (S105), the CCD 25 ends the reading operation (S106).
[0031]
On the other hand, in the double-sided reading mode, when the document set sensor 82 detects that a document is set on the document tray 10 (S110), the transport clutch 81 is turned on and the transport motor 80 starts (S111). When the conveyance of the document is started and the document detection sensor 60 detects the document and detects the trailing end of the document and turns OFF, the conveyance is temporarily stopped (S112). Then, the switching operation of the switching guide 54 is performed, and the document is conveyed in the reverse direction and carried into the sub-conveying path (S113). When the document detection sensor 61 detects the document and detects the trailing edge of the document and turns OFF, the reverse conveyance is temporarily stopped (S114). After a lapse of a predetermined time, the conveyance is started again (S115), and when the original detection sensor 61 detects the leading edge of the original and is turned ON (S116), the reading operation of the CIS 50 is started (S117). When the document is further conveyed and the document detection sensor 60 detects the leading edge of the document and is turned ON (S118), the reading operation of the CCD 25 is started (S119). When the document is further conveyed and the document detection sensor 60 detects the trailing end of the document and is turned off (S122), the reading operation of the CCD 25 ends (S123). When it is detected that the document is conveyed to the main conveyance path and discharged to the document discharge tray 22, the conveyance clutch 81 is turned off and the conveyance motor 80 stops.
[0032]
In FIG. 7, during the double-sided reading operation, the original is conveyed, then conveyed in the reverse direction, carried into the sub-conveyance path, and then subjected to double-sided reading. , And then the document is conveyed in the reverse direction, the original is carried into the sub-conveyance path, and the other surface may be read by the CIS 50. By controlling the double-sided reading operation in this way, the reading operation by the CCD 25 and the reading operation by the CIS 50 do not overlap, the image processing can be simplified, and the memory capacity can be reduced. An example is shown in FIG.
[0033]
In FIG. 8, the one-sided reading mode (S100 to S106) is the same as that in FIG. In the double-sided reading mode, when the document set sensor 82 detects that a document is set on the document tray 10 (S210), the transport clutch 81 is turned on and the transport motor 80 is started (S211). When the conveyance of the document is started and the document detection sensor 60 detects the leading edge of the document and is turned ON (S212), the reading operation of the CCD 25 is started (S213). When the document detection sensor 60 detects the trailing edge of the document and turns OFF, the conveyance is temporarily stopped (S214), and the reading operation of the CCD 25 is terminated (S215). Thereafter, the switching operation of the switching guide 54 is performed, and the document is conveyed in the reverse direction and is carried into the sub-conveying path (S216). When the document detection sensor 61 detects the document and detects the trailing end of the document and turns OFF, the reverse conveyance is temporarily stopped (S217). After a lapse of a predetermined time, the conveyance is started again (S218), and when the original detection sensor 61 detects the leading edge of the original and is turned ON (S219), the reading operation of the CIS 50 is started (S220). When the document detection sensor 61 detects the trailing edge of the document and turns off (S221), the reading operation of the CIS 50 ends (S222). When it is detected that the document is conveyed to the main conveyance path and discharged to the document discharge tray 22, the conveyance clutch 81 is turned off and the conveyance motor 80 stops.
[0034]
In the embodiment described above, the original is set on the original tray 10 during both the single-sided reading operation and the double-sided reading operation. However, the original may be directly set on the double-sided original tray during the double-sided reading operation. This can further reduce the time required for the double-sided reading operation.
[0035]
In the above-described embodiment, the double-sided document tray is formed on the inner surface of the upper cover 56. However, the double-sided document tray may be attached to the apparatus main body so as to be able to be pulled out and pulled out at the time of the double-side reading operation.
[0036]
【The invention's effect】
As described above, in the present invention, the second reading unit is disposed in the sub-conveying path, and the original does not pass through the sub-conveying path while the one-sided reading control unit is operating. The surface does not get dirty. Further, since the sub-transport path is configured to merge with the main transport path on the upstream side of the first reading unit, both sides of the document can be read by one-time document conveyance, and the reading processing time is substantially the same as that of the related art. It can be maintained.
[0037]
Further, at the time of double-sided reading, if the document is controlled to be conveyed to the main conveyance path by the main conveyance means and carried into the sub conveyance path, the document is conveyed by the main conveyance means from the same document tray as in the one-sided reading operation. be able to.
[0038]
In addition, by arranging the double-sided document tray in the sub-conveyance path, the document once conveyed to the sub-conveyance path can be stably held, and the conveyance operation when reading the double-sided document can be reliably performed. It becomes. If the double-sided document tray is formed on the inner surface of the upper cover, the upper cover is closed and the double-sided document tray is stored except when the double-sided reading operation is performed. Further, if the detection of the opening of the upper cover by the detection unit and the operation of the double-sided reading unit are performed, the operation for performing the double-sided reading can be simplified. Further, if the sub-transporting means is connected to the main transporting means in conjunction with the opening operation of the upper cover, it is not necessary to separately provide a drive source for the sub-transporting means, and the mechanism of the transporting means can be made compact.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view of an entire image forming apparatus to which an embodiment according to the present invention can be applied.
FIG. 2 is a schematic sectional view of an embodiment according to the present invention.
FIG. 3 is a schematic cross-sectional view of the embodiment according to the present invention when an upper cover is opened.
FIG. 4 is an operation explanatory diagram in FIG. 4;
FIG. 5 is a schematic diagram of a drive transmission mechanism of a transport roller.
FIG. 6 is a block diagram illustrating the configuration of an image forming apparatus according to an embodiment of the present invention;
FIG. 7 is a flowchart for document conveyance according to the embodiment of the present invention.
FIG. 8 is another flowchart of document conveyance according to the embodiment of the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 document transport section 2 document reading section 3 recording section 4 paper transport section 5 paper feed section 6 paper feed section 11 pickup roller 12 feed roller 13 retard roller 14 feed roller 15 press roller 16 feed roller 17 press roller 18 feed roller 19 press roller 20 discharge roller 21 press roller 23 platen 24 lamp 25 CCD
50 CIS
51 White roller 52 Feed roller 53 Press roller 54 Switching guide 56 Upper cover 57 Guide 58 Guide 59 Hinge 60 Document detection sensor 61 Document detection sensor 70 Drive gear 71 Idle gear 72 Idle gear 73 Idle gear 74 Drive gear 75 Support member 76 Lock Element

Claims (6)

A main transport unit that transports the original in the main transport path, a first reading unit that is disposed in the main transport path and reads one side of the original, and joins the main transport path upstream of the first reading unit. A sub-transporting unit that conveys the document in the sub-transporting path, a second reading unit that is disposed in the sub-transporting path and reads the other surface of the document, A single-sided reading control unit that conveys and reads only one side of the document by the first reading unit, and conveys the document to the sub-conveying path and the main conveying path by the sub-conveying unit and the main conveying unit, and performs An image reading apparatus comprising: a double-sided reading control unit that reads both sides by the first and second reading units. 2. The image reading apparatus according to claim 1, wherein the double-sided reading control unit controls the original to be conveyed to the main conveyance path by the main conveyance unit and to be conveyed to the sub conveyance path. 3. The image reading device according to claim 1, wherein a double-sided document tray is provided in the sub-conveying path. The image reading apparatus according to claim 3, wherein the double-sided document tray is formed on an inner surface of an upper cover, and is set by opening the upper cover. 5. The image reading apparatus according to claim 4, further comprising a detection unit configured to detect opening and closing of the upper cover, wherein the double-sided reading control unit operates in response to an open state detection signal from the detection unit. 6. The image reading apparatus according to claim 4, further comprising a drive transmission unit that connects the sub-transport unit to the main transport unit in conjunction with the opening operation of the upper cover.

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