JP2000261625A - Image reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a deteriorated image in advance by preventing an original from fitting due to the difference from the thickness without increasing number of components in response to change in a behavior of a sheet original, depending on the thickness of the original. SOLUTION: A 1st traveling body mounted with a light source 1A1 emitting a light for scanning exposure to an original placed on an original platen 2 and a 1st mirror 1A2 reflecting a reflected light in the original and a 2nd traveling body mounted with a 2nd mirror 1A4 reflecting a light reflected in the 1st mirror 1A2 and a 3rd mirror 1A5 reflecting a reflected light in the 2nd mirror 1A4 are connected interlockingly. The image reader is provided with a sheet-through mechanism (carrier drum 7 or the like) that carries the original on other original platen 1D than the original platen 2, while the 1st and 2nd traveling bodies are fixed. In this case, the position of the 1st traveling body holding the 1st mirror 1A2 is changed with the thickness of the paper of the original carried by the sheet-through mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an image reading apparatus, and more particularly to an arrangement for adjusting the position of an optical system with respect to an object to be read in accordance with the thickness of the object.

[0002]

2. Description of the Related Art A scanner, which is an image reading apparatus used as an image reading apparatus used in a copier or a multifunction machine in which a copying function and a facsimile function are combined, or an image reading apparatus used as a peripheral device such as a personal computer, has an original mounting. There is a structure in which a mounting table is provided on the upper surface of a housing and an opening / closing lid that can be opened and closed with respect to the document mounting table is provided. In the above document reading apparatus, the first and second optical systems are scanned while moving the document on the document table at a speed ratio of 2: 1. Unlike the configuration of the system, the optical system member is fixed at the home position, and a form in which a sheet-shaped original to be read as an image to be read is moved while scanning with respect to the optical system, that is, a so-called sheet is passed. A document reading apparatus of a type called sheet through has also been proposed.

A document reading apparatus of the latter type includes a light source, a first carriage provided with a reflecting mirror, and an image forming optical element in an optical system for reading a document in a housing provided with a document table on an upper surface. A second carriage provided with a reflecting mirror for switching an optical path for a photoelectric conversion element such as a CCD to be used is provided so as to be movable in the sub-scanning direction.
An automatic sheet feeding device, a so-called document feeder (hereinafter, referred to as DF), is provided on an opening / closing lid provided to be capable of opening and closing the document table. A sheet-shaped document is read while the document is moving toward the discharge tray. In this case, the first and second carriages are fixed at the scanning start position, that is, the home position, and read a moving sheet-shaped document.

[0004]

When reading a sheet document using the DF, the behavior of the sheet document changes depending on the thickness of the sheet document, and the sheet document rises at the reading unit. There is. For this reason, there is a possibility that adverse effects such as a change in density due to a change in illuminance from a light source provided in the reading unit or a case where a document has oblique lines or the like may be distorted and read.

FIG. 8 is a schematic view of a reading section for explaining the above-mentioned adverse effects. In the drawing, the reading section includes a transport drum for rotating a sheet-like document moving from a document tray (not shown). Light source 1A1 and reflecting mirror 1A2 provided on a first carriage (not shown) facing
And a second carriage (not shown)
Are located in the vicinity of the first carriage. The transport drum 7 has a shape capable of turning a sheet-shaped document using rubber or the like. The transport drum 7 is not limited to the above-described configuration, and a configuration in which scanning light is not transmitted using glass, metal, or the like may be used. Between the transport drum 7 and the first carriage, a sheet-through glass 1D constituting a contact glass for placing a moving sheet-like original, that is, the above-mentioned sheet-like original in the sheet-through format is arranged. The sheet through glass 1D is formed integrally with support plates 1E and 1F arranged on the upper surface of a housing of an image reading apparatus such as a document reading apparatus or a scanner. Above the sheet through glass 1D, an upper guide member 1G that regulates the upward movement of the moving sheet-shaped document and regulates the moving direction toward the glass surface is disposed.

When a sheet-shaped document is thin and has relatively low bending rigidity, that is, when there is no waist, as shown in FIG.
When the sheet-shaped document S whose movement path has been inverted by the transport drum 7 and the feed roller 9 is almost in contact with the upper surface of the sheet-through glass 1D, and faces the light source 1A1 and the reflecting mirror 1A2 of the first carriage. Is read at an appropriate position in contact with the glass surface, that is, at a position where the optical axis coincides with the reflecting mirror 1A2 (the position indicated by reference numeral HP in FIGS. 8 and 9).

However, in the case of a thick sheet of a sheet-shaped document having relatively strong stiffness, as shown in FIG. 10, the sheet-shaped document moves without being in close contact with the sheet-through glass 1D. Therefore, a gap is generated between the glass surface and the sheet original S. In this case, the above-mentioned adverse effects occur.

For this reason, in the prior art, for example,
As disclosed in Japanese Patent No. 18655, a sheet-through glass that allows a sheet-shaped document to pass through is provided as one member of the sheet-through mechanism, and the sheet-through glass is supported by an elastic member, and the glass is provided. There has been proposed a configuration in which a feed roller capable of adjusting the position in the height direction is provided, and the height of the glass surface is adjusted by the feed roller.

However, in the case of such a configuration, an elastic structure for supporting the sheet through glass so as to be able to move up and down, a means for urging the feed roller up and down with respect to the glass surface, and an urging member are required. Therefore, there is a possibility that the cost may increase due to an increase in the number of parts. In addition, when such a configuration is not used, a problem remains in that a change in the behavior according to the thickness of the sheet-shaped document, that is, the document is lifted and proper reading cannot be performed.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent a document from being lifted due to a difference in thickness without increasing the number of parts in view of the above-mentioned problems in the conventional image reading apparatus, particularly, changes in behavior according to the thickness of a sheet-like document. Accordingly, it is an object of the present invention to provide an image reading apparatus having a configuration capable of preventing image deterioration beforehand.

[0011]

According to the first aspect of the present invention,
A first traveling body that holds a light source that irradiates light for scanning exposure on a document placed on a document table and a first mirror that reflects light reflected from the document; A second mirror that reflects the reflected light and a second traveling body that holds a third mirror that reflects the reflected light from the second mirror so as to operate in relation to each other, and reciprocates these traveling bodies in the sub-scanning direction. A driving device for moving, a scanning device including an image reading device for forming an image of reflected light from the third mirror on a photoelectric conversion element, and a state in which first and second traveling bodies are fixed in addition to the scanning device. In an image reading apparatus provided with a sheet through mechanism for conveying and moving a document on a document table different from the document table, the position of the first traveling body holding the first mirror is passed through the sheet through mechanism. Depending on the thickness of the original to be printed It is characterized in that change Te.

According to a second aspect of the present invention, in the image reading apparatus according to the first aspect, a plurality of (N) chart originals are fed by the sheet through mechanism under the same thickness, and each sheet is fed one by one. The image is read while the position of the first traveling body is shifted, and when the optimal reading is performed, the first image is read.
It is characterized in that the position of the traveling body is stored and the optimum position of the first traveling body is set according to the thickness of the document.

According to a third aspect of the present invention, in the image reading apparatus according to the second aspect, a position of the first traveling body at which an optimum image is obtained from a result of reading a plurality of chart documents corresponding to the thickness is stored. An input unit such as an operation unit capable of changing the position of the first traveling body as a setting corresponding to the paper thickness is provided.

According to a fourth aspect of the present invention, in the image reading apparatus according to any one of the first to third aspects, the first traveling body moves the original from an initial position according to a change in thickness. It is characterized in that it is configured to be movable to a position where it contacts on the another document table.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing an internal configuration of an image reading apparatus which is an example for describing an embodiment of the present invention. In the following description, the same members as those described above are denoted by the same reference numerals. In FIG. 1, the image reading device corresponds to a document reading device, and the document reading device 1 has a document table 2 provided on the upper surface of a housing 1A and is arranged near the document table. An opening / closing lid 4 hinged by a support shaft 3A of the hinge coupling member 3 is provided. Open / close lid 4
Is provided as a pressure plate for a document placed on the document table 2 and has a sheet-shaped document feeding structure therein. The sheet-type original feeding structure includes an original placing tray 5, an output tray 6, and a transport drum 7 disposed between these two trays and rotating around a sheet-type original feeding path.
And a feed roller 9 and a discharge roller 9A. The reading and scanning unit includes a first carriage 1A3 as a first traveling body having a light source 1A1 and a reflecting mirror 1A2 corresponding to a first mirror among the optical system members located at the home position in the housing 1A. A reflection mirror 1A4, 1A5 corresponding to a second or third mirror for switching an optical path toward a photoelectric conversion element 1C such as a CCD, which is an imaging optical element to be described later, and a half of the first carriage 1A3. A second carriage 1 which is a second traveling body movable at a speed ratio
A6. First and second carriages 1A
When reading a document placed on the document table 2, the reference numerals 3 and 1A6 move forward from the home position in the sub-scanning direction at the above speed ratio.

When the sheet-like originals stacked on the original tray 5 are fed by the feed-out roller 8, they are separated and fed one by one by a pair of separation rollers 8A and 8B disposed in front of the sheet-like original. The feeding path is reversed by the transport drum 7 constituting the mechanism, and the scanning is performed so as to face the first carriage 1A3 including the light source 1A1 and the reflecting mirror 1A2 located at the home position.
The sheet through mechanism includes, in addition to the transport drum 7, a sheet through glass 1 </ b> D opposed to the transport drum 7 and disposed between the transport drum 7 and the first carriage 1 </ b> A <b> 3. The sheet glass 1D corresponds to a document table different from the document table 2 disposed on the upper surface of the housing 1A. As described with reference to FIG. 8, the sheet through glass 1D is formed integrally with and supported by the support plates 1E and 1F. Above the sheet through glass 1D, the sheet-form document S is prevented from floating. An upper guide member 1G that guides the user is provided.

After scanning, the sheet-shaped document is discharged toward the discharge tray 6 by a feed roller 9 and a discharge roller 9A provided in a feed path between the transport drum 7 and the discharge tray 6. You.

The discharge tray 6 is provided with a stopper 10 for stopping the front edge of the sheet document in the discharge direction. The stopper 10 stops the front edge of the sheet document in the discharge direction. Are dropped onto the paper discharge tray 6 and stacked.

Light reflected from the original through the light source 1A1 and the respective reflecting mirrors of the first carriage 1A3 and the second carriage 1A6 passes through the imaging lens 1B and enters the CCD sensor 1C as a photoelectric conversion element. As a result, photoelectric conversion is performed, and an analog signal is output. The analog signal from the CCD 1C is A / D converted and input to the image processing board 1C1, where various image processing (binarization, gradation processing, scaling, editing, etc.) is performed.

As shown in FIG. 2, the first carriage 1A3 is capable of moving in the direction of movement of a sheet-shaped document (for convenience, indicated by the symbol S) (the state shown by a two-dot chain line in the figure). ). That is, although not shown, the first carriage 1A3 is connected to and driven by a drive source whose rotation angle is variable by a pulse input from a stepping motor or the like. The rotation amount and the rotation direction are controlled by the control unit 20.

FIG. 3 is a block diagram for explaining the configuration of the control unit 20. In FIG. 3, the control unit 20 includes a first board 21 having a microcomputer as a main part,
A second board 22 having an I / O interface function. The first board 21 is a scanner engine sequence, operation timing control of each member, image processing, overall control of a reading device such as control of an operation unit described later,
It is a part that performs system control and has a dedicated power supply (PSU:
Power Supply Unit).

The second board 22 includes various sensors 24 and an actuator 2 connected to a control unit (in FIG. 3, represented as a paper feed control unit) 23 of a sheet original feeding unit.
5. Various sensors 26 and actuators 2 in the reading unit
7, a ballast 28 for lighting the lamp of the light source 1A1, a stepping motor 29 as a driving source for the first carriage, a home position sensor (shown as an HP sensor in FIG. 3) 30 for each carriage, and image data This is a section for controlling the storage memory 31 and the user setting memory 32, respectively, and functions as an input / output port for controlling the load of the sensors and actuators of the scanner section and the document feeding section. .

In the memory 31 for storing image data, for example, addresses 1 to 100 can be registered.
It has a capacity equivalent to 100 plate-size documents.

The control unit 23 of the sheet document feeding unit includes a control unit 23 shown in FIG.
Is connected. In FIG. 4, the operation unit 33 includes a start switch 33A for issuing a reading start command, a call switch 33B for calling various data by a user, a setting registration switch 33C for registering various data, and various data numerical values. A numeric keypad 33D used for registration and a button switch 33E functioning as an execution key when deciding to input various data are provided.

The control section 20 changes the position of the first carriage 1A3 according to the thickness of the fed sheet-form document. For example, the first mode is thin paper, the standard paper mode (52 to 105 g / m ² ), and the ^second mode is
Cardboard mode (106-128 g / m ² )
When one of these modes is selected by the numeric keypad of the operation unit 33, the position of the first carriage 1A3 is set to the home position (the position indicated by reference numeral HP in FIG. 2) in accordance with the selected content. ) And other positions. Positions other than the home position correspond to the case of the cardboard mode. In this case,
As shown by the two-dot chain line in FIG. 2, the sheet-shaped document S moves rightward from the home position shown by the solid line in the moving direction. This is because, when a thick sheet-shaped document S is fed, as described above, unlike the case of a thin sheet-shaped document, the position of contact with the surface of the sheet through glass 1D is located at the home position. This is due to the fact that they do not coincide with the optical axis of the mirror 1A2. That is, a thick sheet-shaped document comes into contact with the sheet through glass 1D at a position preceding the reflecting mirror 1A2 located at the home position and the thin sheet-shaped document in the feeding direction, and the reflecting mirror 1A2
Since the gap D is generated at a position facing the mirror 1A, the reflecting mirror 1A2 is moved to a position where the gap cannot be formed. Reflector 1A2
Moves, the second carriage 1A6 also moves in the same direction in conjunction with the first carriage 1A3 so that the optical path length with respect to the CCD sensor 1C does not change. In FIG. 2, the reflecting mirror (for convenience, 1A4A, 1A5A) of the second carriage 1A6 after the movement is shown.
) Are indicated by a two-dot chain line.

Since the present embodiment has the above configuration,
The operation will be described with reference to a flowchart illustrating the operation of the control unit 20, as shown in FIG. In FIG. 5, it is determined whether or not the mode is the thick paper mode (corresponding to the case where the numeric keypad of the numeral 2 is operated on the operation unit 33 shown in FIG. 4) (ST1). If the thick paper mode is not selected, it is determined that the thin paper mode (corresponding to the case where the numeric keypad of the operation unit is operated) is selected and whether the first carriage 1A3 is located at the home position. Is determined based on the output from the home position sensor 30 (ST2). When the first carriage 1A3 is located at the home position, the light source 1A1 for document illumination is turned on (ST3), the sheet document feeding unit is started, and the feeding roller 8 (see FIG. 1) rotates. When started, the sheet-like original on the original placing tray 5 is fed out (ST4).

When the first carriage 1A3 is not at the home position, the stepping motor 29
Is operated to maintain the rotation until the home position is turned on, and the first carriage 1A3 is returned to the home position (ST5).

When the thick paper mode is selected in step ST1 (in FIG. 5, the second mode is displayed), a command to move the first carriage 1A3 from the home position is output. Then, the stepping motor 29 is driven (ST6). In this case, the rotation amount of the stepping motor 29 is determined by an experiment or the like from the home position to the optical axis optimum position where the sheet-shaped original in the thick paper mode contacts the surface of the sheet through glass 1D and the optical axis coincides with the reflecting mirror 1A2. Is calculated, and a number of pulses corresponding to the distance to the position are output (ST7).
In this embodiment, since the result that the optical axis optimum position needs to be moved to the right by 2.5 mm from the home position in FIG. 2 is obtained, the first carriage 1A3 by one pulse input to the stepping motor 29 is obtained. When the movement amount of the stepping motor is 0.000625 mm, 400 pulses are output to the stepping motor 29. When the output of the predetermined number of pulses to the stepping motor 29 ends, the processing shown in steps ST3 and ST4 is executed.

According to this embodiment, the first carriage 1A
When the thick paper mode is selected only by using the stepping motor 29 which is an existing driving source provided as the driving body of No. 3, the optical system member is located at the optimum optical axis position when reading the thick sheet-shaped document. Can be positioned. As a result, it is possible to avoid adverse effects due to the floating of the document without requiring a special structure. In addition,
The determination of the selection mode is not limited to the case of the user via the operation unit 33, and the determination may be made automatically using a paper thickness sensor.

Next, an embodiment of the invention described in claim 2 will be described. A feature of the invention described in claim 2 is that a plurality of chart originals are read while shifting the position of the first carriage, and the position of the first carriage when the best result is obtained among the read results is stored. In addition, a so-called focusable first carriage position can be set. FIG. 6 shows a plurality of chart documents S1 under the same thickness condition, and a plurality of oblique lines are formed on the surface. Such a chart document S1 may be formed by forming an oblique line on a document having a paper thickness which is usually used by a user. In this embodiment, five chart originals S1 are used, and the first carriage 1A3
Is shifted and the reading is performed.

FIG. 7 is a flowchart for explaining the reading process of the chart document S1 executed by the control unit 20. In FIG. 7, it is determined whether or not the chart document S1 is on the document placing tray 5. (ST10) When there is no chart document S1, the reading scan is not performed, and the document reading device 1 is maintained in a normal standby state (ST11). Chart document S on document placing tray 5
1 is placed, the lamp of the light source 1A1 is turned on (ST12), and the feeding roller 8 and the separation rollers 8A and 8B are operated to perform separation of each sheet (ST1).
4) Convey only one chart document S1 (ST1)
5). At this time, the various sensors are in an operating state, and each check of the document feeding speed, registration position, jam detection, and the like are executed.

The chart document S1 fed out of the document placing tray 5 and separated one by one reaches the sheet through glass 1D, where the chart is read and the memory 31 is read.
(See FIG. 3), the image information is registered (ST16, ST1).
7).

Before the next chart document S1 is advanced, the first carriage (indicated as a first traveling body in FIG. 7) is moved by a predetermined amount from the home position in the same direction as in the thick paper mode, that is, in FIG. Is moved rightward (ST18). In this embodiment, 80 pulses are output to the stepping motor 29 for this movement (ST19). In the present embodiment, the chart original S1
The first carriage 1A3 is moved by a predetermined amount each time
Is moving, but as the amount of movement,
0.5mm, 1.0mm, 1.
It is adapted to move up to 5 mm, 2.0 mm and 2.5 mm. When the five chart documents S1 are fed out, the document reading device 1 returns to the standby state by detecting the presence or absence of the document on the document placing tray 5. In this case,
The first carriage 1A3 returns to the home position.

The setting of the movement amount is optional. For example,
To obtain a fine image, the first carriage 1A3
The number of pulses per sheet is set to 1 with the moving amount of
6 is also possible.

According to such an embodiment, it is possible to determine the position of the first carriage 1A3 at which the best resolution can be obtained when the original having the thickness normally used by the user is obtained. By selecting and setting the position using the operation unit 33, the thickness of the sheet normally used by the user is set.
When the G original is used for reading, a good image can always be read without any special operation, that is, an operation such as focus adjustment.

Next, an embodiment of the present invention will be described. The feature of the invention described in claim 3 is that the position of the first carriage 1A3 when the optimum reading is performed among the reading results of the chart document S1 is registered, and the position data is selected and set. It is characterized by being able to do. That is, when the best image reading is performed in the reading scan of the chart document S1, the user operates the user setting registration switch 33C of the operation unit 33 to operate the first carriage 1A at that time.
3 is stored in the user setting memory 32 (see FIG. 3).
Register with. For example, when the third reading result is the best, the user setting register switch 33C is operated, the numeral 3 is operated by the ten keys 33D, and the button switch 33E functioning as an execution key is operated. As a result, the position data of the first carriage 1A3 used for the third reading is stored. Document reading device 1
When the user operates the user setting call switch 33B of the operation unit 33 to call the previously stored position data of the first carriage 1A3, the position setting of the first carriage 1A3 based on the position data is performed. Is performed, and a reading scan can be executed.

According to the present embodiment, by storing the position data of the first carriage 1A3 at which the optimum reading can be performed, the user can perform the reading operation of the chart original without performing the reading operation of the chart document one by one according to the thickness. The reading scan based on the selected position data can be reproduced.

[0038]

According to the first and fourth aspects of the present invention,
Since the first traveling body can move in accordance with the thickness of the original on which the sheet-through mechanism moves, it is possible to set the first roller of the first traveling body to an optimal reading position regardless of the thickness of the original. Can be. As a result, even when the document is lifted, the reading can be performed at the position where the document is in contact with the document table, and the illuminance change from the light source can be performed only by controlling the position of the existing first traveling body. And distortion of the read image can be prevented. As a result, it is not necessary to provide a new configuration in addition to the existing configuration, so that appropriate image reading can be performed without increasing the cost.

According to the second aspect of the present invention, an image is read while shifting the position of the first traveling body for each of a plurality of chart documents, so that the optimal position for reading the first traveling body is obtained. Can be determined.

According to the third aspect of the present invention, the optimum position of the first traveling body according to the thickness of the document is stored, and the optimum position of the first traveling body stored by the user's thickness selection is set. Therefore, it is possible to set the optimal reading position according to the thickness by a simple operation.

[Brief description of the drawings]

FIG. 1 is a schematic diagram for explaining a configuration of an image reading apparatus which is an example for explaining an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a configuration of a reading unit of the image reading apparatus illustrated in FIG.

FIG. 3 is a block diagram for explaining a configuration of a control unit used in the image reading apparatus shown in FIG.

FIG. 4 is a diagram for explaining a configuration of an operation unit used in the control unit shown in FIG. 3;

FIG. 5 is a flowchart for explaining the operation of the control unit shown in FIG. 3;

FIG. 6 is a perspective view showing a chart document used in the embodiment of the invention described in claim 2;

FIG. 7 is a flowchart for explaining the operation of the control unit when the chart document shown in FIG. 6 is used.

FIG. 8 is a cross-sectional view illustrating an example of a document reading unit.

9 is a cross-sectional view illustrating one mode of a document fed to the document reading unit illustrated in FIG.

FIG. 10 is a cross-sectional view for explaining a problem occurring in a document fed to the document reading unit shown in FIG.

[Explanation of symbols]

DESCRIPTION OF REFERENCE NUMERALS 1 Document reading device 1A, housing 1A 1 Light source 1A2 Reflecting mirror 1A3 corresponding to first mirror 1A3 First carriage 1A5 corresponding to first traveling body 1A6 Reflecting mirror corresponding to third mirror A second carriage corresponding to a traveling body 1C A CCD sensor serving as a light source conversion element 1D A sheet through glass which is a constituent member of a sheet through mechanism 2 A document placing table 7 A transport drum forming a part of the sheet through mechanism 9 A feeding roller Reference Signs List 20 control unit 29 stepping motor S1 corresponding to driving device for traveling body chart document

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroyuki Watase 1-3-6 Nakamagome, Ota-ku, Tokyo, Ricoh Co., Ltd. (72) Keisuke Igarashi 1-3-6 Nakamagome, Ota-ku, Tokyo Ricoh Co., Ltd. (72) Inventor Junichi Murano 1-3-6 Nakamagome, Ota-ku, Tokyo F-term in Ricoh Co., Ltd. 5C051 AA01 BA03 DA03 DB01 DB09 DE07 DE15 5C072 AA01 BA02 BA17 DA04 EA05 LA02 LA18 MA01 MB01 MB06 NA01 RA18 UA11

Claims (4)

[Claims] A first light source for irradiating a document placed on a document table with light for scanning exposure and a first mirror holding a first mirror for reflecting light reflected from the document; A second mirror that reflects the light reflected by the first mirror and a second traveling body that holds a third mirror that reflects the light reflected from the second mirror so as to operate in association with each other;
In addition to a driving device for reciprocating the traveling body in the sub-scanning direction, a scanning device including an image reading device for forming an image of reflected light from the third mirror on a photoelectric conversion element, In an image reading apparatus provided with a sheet-through mechanism that conveys and moves a document on a document table different from the document table in a state where the first and second traveling bodies are fixed, An image reading apparatus wherein a position is changed according to a sheet thickness of a document to be passed by the sheet through mechanism. 2. The image reading apparatus according to claim 1, wherein a plurality of (N) chart originals are fed by said sheet through mechanism under the same thickness, and the first sheet is fed to said first sheet by the sheet through mechanism.
An image is read while shifting the position of the traveling body, and the position of the first traveling body at the time of performing the optimal reading is stored to set an optimal position of the first traveling body according to the thickness of the document. Image reading device. 3. The image reading device according to claim 2, wherein a position of the first traveling body at which an optimum image is obtained from a result of reading a plurality of chart documents according to the thickness is stored, and the setting according to the sheet thickness is stored. An image reading apparatus comprising an input unit such as an operation unit capable of changing a position of a first traveling body. 4. The image reading apparatus according to claim 1, wherein the first traveling body is configured such that the original is placed on the another original table from an initial position according to a change in thickness. An image reading device, wherein the image reading device is configured to be movable toward a contact position.