JP2020017991A - Image reading device and image formation device - Google Patents

Abstract

To solve a problem of an image reading device, where an original is read and an original size is detected automatically, that an end of the original exceeds an original size detectable region and the original size cannot be detected in a maximum size original or the like for which it is hard to determine the size.SOLUTION: An image reading device includes: an original loading surface 43a; a mounting table frame 42; an original reading sensor 41 placed movably in a sub-scanning direction and reading the original image; an opening/closing unit 22 including an original press sheet 37 for pressing the original; and a drive control section. The mounting table frame 42 and the original loading surface 43a form a border line extending in the main scanning direction. The original press sheet 37 has a projection section 37a projecting in the main scanning direction on the boundary side. The drive control section reads size information of the original in a process for moving the original reading sensor 41 toward the boundary, after moving from the boundary to a position corresponding to the projection section 37a, in the sub-scanning direction.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an image reading device that reads an image of a document, and an image forming apparatus including the image reading device.

  Conventionally, image reading apparatuses such as copiers and scanners include a document table having a contact glass on which a document is placed in close contact to read the document, an image reading unit arranged below the contact glass, a white color. (See, for example, Japanese Patent Application Laid-Open No. H11-157556), and performs automatic detection of the size of an original while reading the original.

JP-A-2009-182949 (page 7, FIG. 4)

  In the case where the light transmission area of the contact glass is not restricted, to detect the original size of the largest original, the edge of the area where the original size can be detected is set to the end of the original pressing sheet and the end of the largest original placed. It only has to be between the ends. However, in practice, the light transmission area is determined by the size of the apparatus, and accordingly the position of the end of the original pressing sheet is restricted.Therefore, it is necessary to secure a sufficient distance between the end of the original pressing sheet and the end of the maximum size original. For documents of the maximum size that are difficult to determine when opening a booklet or notebook of a standard size, or that have a large manufacturing error, the edge of the document exceeds the area where the document size can be detected. In some cases, detection was not possible.

The image reading device according to the present invention includes:
A document placing portion for placing a document, a holding portion for supporting the document placing portion, and an image which is arranged movably in a first direction and reads an image of the document placed on the document placing portion. A reading unit, an opening / closing unit that is provided to be capable of opening and closing with respect to the document placement unit and the holding unit, and includes a pressing member that presses the document placed on the document placement unit; and the image reading unit. A drive control unit that drives and controls the movement and image reading of the
The holding unit and the document placement unit form a boundary extending in a second direction orthogonal to the first direction;
The pressing member, when the opening and closing unit is in the closed position, is located on the side of the boundary, and has a protruding portion that protrudes in the second direction,
The drive control unit moves the image reading unit from the boundary in the first direction to a position corresponding to the protrusion of the pressing member when the opening / closing unit is at a closed position, to the position. Then, when the opening / closing unit is at the closed position, in the process of moving the image reading unit from the position toward the boundary, reading the size information of the document placed on the document placing unit. Features.

  According to the present invention, when reading the size information of the original placed on the original placing portion, the area of the original placing portion can be fully used, so that it is possible to cope with variations in the size of the original and to reduce the size of the apparatus. Can also contribute to

FIG. 1 is an external perspective view of an image forming apparatus according to a first embodiment of the present invention. FIG. 2 is a partially enlarged view of a portion surrounded by a dotted line L in FIG. 1. FIG. 2 is a main part configuration diagram of only the image reading unit in FIG. 1 viewed from the right side (positive direction of the Y axis). FIG. 4 is a main part configuration diagram showing a state when an opening / closing unit is at a closed position in the image reading unit shown in FIG. 3. 4A is a partially enlarged view of a portion surrounded by a dotted line M in FIG. 4, and FIG. 4B is a partially enlarged view of a portion surrounded by a dotted line N in FIG. FIG. 9 is a dimensional plan view showing an arrangement relationship of a document placing surface of a contact glass, a document pressing sheet, a sponge material, and dimensions of each part when the opening / closing unit is at a closed position. FIG. 3 is a block diagram mainly illustrating a configuration of a main part of a drive control system of a document size reading operation of an image reading unit according to the present invention. FIG. 9 is a diagram provided for explanation of a document size reading operation of the image reading unit.

Embodiment 1 FIG.
FIG. 1 is an external perspective view of an image forming apparatus according to a first embodiment of the present invention, and FIG. 2 is a partially enlarged view of a portion surrounded by a dotted line L in FIG. FIG. 1 shows a state where the opening / closing unit 22 is at an open position described later.

As shown in FIG. 1, the image forming apparatus 1 includes an image forming unit 11, an image reading unit 12 disposed above the image forming unit 11, and right and left support units 13L and 13R so as to straddle the image forming unit 11. A main body frame 13 is disposed, holds the image reading unit 12 above the image forming unit 11, and integrally connects the image forming unit 11 and the image reading unit 12.
Hereinafter, when the image forming apparatus 1 is viewed from the front (the direction of the arrow A in FIG. 1), the directions of up, down, left, right, front and back of the image forming apparatus 1 may be specified.

  The image reading unit 12 includes a flat bed unit 21, an opening / closing unit 22 rotatably held by the flat bed unit 21, and an operation unit 23 disposed at a front end of the flat bed unit 21. Includes a document pressing unit 31 and an ADF (auto document feeder) 32 held by the document pressing unit 31. The document pressing unit 31 is fixed to the lower surface of the pressing plate body 35 and the pressing plate body 35. And a document pressing sheet 37 as a pressing member joined to a lower surface of the sponge material 36 as an elastic member.

  The flatbed unit 21 includes a document reading sensor 41 (FIG. 3) serving as an image reading unit disposed in an inner space of the flatbed unit 21 and a housing or a part of the flatbed unit 21. The mounting table frame 42 as a holding portion in which the opening 45 and the second reading opening 46 are formed, and the contact glass 43 attached to the lower surface of the mounting table frame 42 so as to cover the second reading opening 46 from the inside (FIG. 3). Is provided.

  The original 60 (FIG. 5) is placed on the surface of the contact glass 43, but as described later, it is assumed that the original 60 having a maximum of A3 is placed horizontally (vertically) and read. Therefore, the second reading opening 46 is formed to be horizontally long, and is formed so that the A3-read original 60 can be placed on the surface of the contact glass 43.

  Right and left support portions 42L and 42R for rotatably supporting the opening / closing unit 22 are disposed near both rear end portions of the mounting table frame 42, and the rotation axis center line is read in the second direction. The opening / closing unit 22 is pivotally supported so as to be in the longitudinal direction of the opening 46.

  Note that the X, Y, and Z axes in FIG. 1 take the Y axis in the rotation axis direction of the opening / closing unit 22, and the X axis is orthogonal to the Y axis and parallel to the surface of the contact glass 43. Thus, the Z axis is set in a direction perpendicular to these two axes. In addition, when the X, Y, and Z axes are shown in other drawings described later, these axis directions are assumed to indicate a common direction. In other words, the XYZ axes in each drawing indicate the direction in which the depicted portion of each drawing constitutes the image forming apparatus 1 shown in FIG. Further, here, it is assumed that the Z-axis is arranged so as to be substantially vertical.

  3 is a main part configuration diagram of only the image reading unit 12 in FIG. 1 as viewed from the right side (positive direction of the Y axis). FIG. 4 is also a main part configuration diagram. This shows a state at a certain time. However, in FIGS. 3 and 4, the ADF 32 is omitted for simplification. 5A is a partially enlarged view of a portion surrounded by a dotted line M in FIG. 4, and FIG. 5B is a partially enlarged view of a portion surrounded by a dotted line N in FIG.

  As shown in these drawings, a document reading sensor 41 extending in the X-axis direction is disposed inside the flatbed unit 21. The document reading sensor 41 is slidably held in the Y-axis direction (sub-scanning direction) by a support guide 44 extending below and arranged in the Y-axis direction, and furthermore, disposed at both ends thereof. The guide projections 41c and 41d are in contact with the lower surface of the contact glass 43 to maintain the sliding posture.

  The document reading sensor 41 is provided with a light emitting element and a light receiving element arranged in the X-axis direction (main scanning direction) on the upper side thereof, for example, to convert the image of the document 60 placed on the contact glass line by line in the main scanning direction. Is provided with a sensor unit 41a (FIG. 4) for reading the data.

  The original 60 is set on the contact glass 43 occupying the second reading opening 46 with the reading surface facing down. The second reading opening 46 of the mounting table frame 42 guides the setting position at this time. Positioning guide is formed.

  That is, as shown in FIG. 5B, a first positioning guide having a contact portion formed substantially perpendicularly to the upper surface of the contact glass 43 on the rear long side portion of the second reading opening 46. A second positioning guide 52 having a contact portion also formed substantially perpendicular to the upper surface of the contact glass 43 is formed on the left short side of the second reading opening 46. .

  A first step portion 53 and a second step portion 54 serving as edges are provided between the upper surface of the contact glass 43 and the front long side portion and the right short side portion of the second reading opening 46 of the mounting table frame 42. Each is formed.

  The boundary between the first step portion 53 and the contact glass 43 in the main scanning direction corresponds to a first boundary, and the boundary between the second positioning guide 52 and the contact glass 43 in the sub-scanning direction corresponds to a first boundary. The boundary between the first positioning guide 51 and the contact glass 43 in the main scanning direction corresponds to the third boundary. Further, the area of the contact glass 43 occupying the second reading opening 46 and capable of mounting the document 60 may be hereinafter referred to as a document mounting surface 43a as a document mounting portion.

  Therefore, when setting the original 60 on the contact glass 43, the operator places the rear and left sides of the original 60 on the first positioning guide 51 and the second positioning guide 52 of the mounting frame 42, respectively. Contact and position.

  On the other hand, when the opening / closing unit 22 is in the closed position, the pressing plate body 35 of the opening / closing unit 22 arranges the document pressing sheet 37 at a position facing the contact glass 43, and places the document pressing sheet 37 via the sponge material 36. To the pressing plate body 35. Therefore, as shown in FIG. 4, when the opening / closing unit 22 is in the closed position, the original 60 (FIG. 5) set on the original placing surface 43 a of the contact glass 43 loses its own weight and the sponge material 36. Due to the elasticity or the like, the document pressing sheet 37 urges the document placing surface 43 a substantially uniformly, and comes into close contact with the contact glass 43.

  An open / close detector 103 (shown only in FIG. 7) that detects when the open / close unit 22 is in the open position shown in FIG. 3 and in the closed position shown in FIG. 4 is provided near the support portions 42L and 42R. Are located.

  FIG. 6 shows the arrangement relationship of the document placing surface 43a of the contact glass 43 occupying the second reading opening 46, the document pressing sheet 37, and the sponge material 36 and the dimensions of each part when the opening / closing unit 22 is in the closed position. It is a dimension top view shown.

  As shown in the drawing, the sponge material 36 fits within the placement surface of the original placement surface 43a of the contact glass 43 occupying the second reading opening 46, that is, the horizontally long outer shape here. The shape and the attachment position are determined so as to be substantially similar to the second reading opening 46 and smaller, and not to protrude from the opening.

  The original pressing sheet 37 is formed to have the same outer dimensions as the sponge material 36 except for the protrusion 37a. The protruding portion 37 a of the document pressing sheet 37 is located on the left side (the second positioning guide 52 side) end of the side of the second reading opening 46 facing the first step portion 53 opposite to the first positioning guide 51. In the vicinity, it is formed so as to protrude from another portion of the side facing the first step portion 53 so as to get over the mounting table frame 42 over the first step portion 53 (see FIG. 2). .

  Here, an example of the shape of the document placing surface 43a of the contact glass 43 occupying the second reading opening 46 (corresponding to the opening shape of the second reading opening 46), and examples of dimensions of each part of the sponge material 36 and the document pressing sheet 37 will be described. .

As described above, it is assumed that the image reading unit 12 reads a document 60 having a maximum size of A3 on the document placing surface 43 a of the contact glass 43 occupying the second reading opening 46 in a landscape orientation (vertical placement). are doing. Therefore, the length a of the document placing surface 43a in the short direction is set to 301 mm,
The length b in the longitudinal direction is 435.8 mm
age,
The lengths c and e of the sponge material 36 and the document pressing sheet 37 excluding the protruding portion 37a in the short direction are 299.5 mm,
The lengths d and f in the longitudinal direction are 433 mm
age,
The gap i between the sponge member 36 and the end of the original placing surface in the longitudinal direction of the original pressing sheet 37 excluding the protrusion 37a is 1.4 mm.
age,
The gap p between the sponge material 36 and the edge of the original placement surface in the widthwise direction of the original pressing sheet 37 excluding the protrusion 37a is 0.75 mm.
And
Further, the protrusion width q of the protrusion 37a of the document pressing sheet 37 is set to 4 mm,
The width h of the tip is 60 mm,
The width k in the longitudinal direction of the chamfered portion formed at the end of the protruding portion 37a opposite to the second positioning guide 52 side was 4 mm.

  Therefore, when the opening / closing unit 22 is in the closed position, the projecting portion 37a largely protrudes from the original placing surface 43a of the contact glass 43 over at least a width of 60 mm, and as shown in FIG. It is located on the mounting table frame 42 beyond the portion 53. The document pressing sheet 37 is formed of a flexible sheet-like member, and furthermore, a protruding portion 37 a having a limited width h at the leading end exists alone without being supported by the sponge material 36. As shown in a), even when affected by the first step portion 53, it is possible to easily warp, and it is possible to prevent the adhesion between the document pressing sheet 37 and the contact glass 43 from being impaired.

  Inside the flatbed unit 21, a first paper sensor 48 and a second paper sensor 49 are arranged at different positions in the sub-scanning direction (Y-axis direction) shown in FIG. Is determined vertically (an arrangement in which the main scanning direction (X-axis direction) is a short side) or horizontally (an arrangement in which the main scanning direction (X-axis direction) is a long side).

  FIG. 7 is a block diagram mainly showing a main configuration of a drive control system of the image reading unit 12 according to the present invention for reading the document size. FIG. 8 is a diagram illustrating the document size reading operation of the image reading unit 12. FIG.

  3, the open / close detector 103 detects when the open / close unit 22 is at the open position shown in FIG. 3 and when the open / close unit 22 is at the closed position shown in FIG. Send to As shown in FIG. 6, the first paper sensor 48 and the second paper sensor 49 arranged at different positions in the sub-scanning direction (Y-axis direction) in the area of the original placing surface 43a of the contact glass 43 are provided at each position. Information on whether or not a document is detected is individually transmitted to the control unit 100.

  The control unit 100 includes a microprocessor, a ROM, a RAM, an input / output port, a timer, and the like. The opening / closing information of the opening / closing unit 22 from the opening / closing detector 103, the original from the first and second paper sensors 48, 49. Upon receiving the detection information and the like, the entire image reading unit 12 is sequence-controlled, and an operation of reading a document size is executed.

  The sensor driving unit 101 moves the original reading sensor 41 in the sub-scanning direction and reads data in the main scanning direction by the sensor unit 41a in accordance with an instruction from the control unit 100. The document reading sensor 41 sends the read image data to the control unit 100. Note that the control unit 100 and the sensor drive unit 101 correspond to a drive control unit.

  With reference to FIG. 8, a method of reading the document size by the control unit 100 will be further described.

  FIG. 8 shows a state in which the reading original 60 is set at a predetermined position and the original placing surface 43 a of the contact glass 43, the original 60, and the original pressing sheet 37 near the second positioning guide 52 in a state where the opening / closing unit 22 is closed. FIG. 3 is a plan view schematically showing a positional relationship among a sponge member 36 and a document reading sensor 41.

  In the figure, a document reading sensor 41 that slides in the sub-scanning direction (Y-axis direction) is located at a home position Ph near the left end of the flatbed unit 21 (FIG. 1). The home position Ph here indicates the position in the sub-scanning direction of the sensor section 41a of the document reading sensor 41 for reading one line in the main scanning direction (X-axis direction). Similarly, when the position of the document reading sensor 41 in the sub-scanning direction is indicated, the position of the sensor unit 41a is indicated.

  The distance w1 indicates the distance from the first positioning guide 51 to the front end of the placed document 60, and the distance w2 detects the front end of the document 60 as described later. The distance w3 represents the distance of the detection start position from the first positioning guide 51 to the first positioning guide 51 of the first step 53 (the distance of the document placing surface 43a of the contact glass 43). The distance w4 indicates the distance from the first positioning guide 51 to the front end of the protruding portion 37a of the document pressing sheet 37.

  When setting the original 60 on the original placing surface 43 a of the contact glass 43, the operator first turns the opening / closing unit 22 (FIG. 1) to the open position, and moves the prepared original 60 to the first positioning guide 51 and the first positioning guide 51. The opposing sides are abutted and positioned on the second positioning guide 52 and set.

  Accordingly, the control unit 100 monitors the opening / closing detection information received from the opening / closing detector 103 and the document detection information from the first and second paper sensors 48 and 49, and opens / closes the document 60 in a state where the document 60 is not set. When it is detected that the unit 22 (FIG. 1) is at the open position, it is determined that the document 60 is to be set, and the sensor driving unit 101 is instructed to move the document reading sensor 41 to the reading movement start position Ps. In response to this instruction, the sensor driving unit 101 moves the document reading sensor 41 from the home position Ph to the reading movement start position Ps.

  Next, when detecting that the opening / closing unit 22 (FIG. 1) is closed in a state where the document 60 is set on the document placing surface 43 a of the contact glass 43, the control unit 100 determines the size of the set document 60. Start reading.

  First, the control unit 100 controls the document reading sensor 41 via the sensor driving unit 101, and sequentially moves the main scanning by the sensor unit 41a while moving in the sub-scanning direction from the reading movement start position Ps toward the home position Ph. The scanning is performed in the direction, the image of the reading area Ve indicated by the two-dot chain line in FIG. 8 is read, and the read image data received from the document reading sensor 41 is temporarily stored in a storage unit such as a RAM.

  The control unit 100 then executes the software processing on the same line in the main scanning direction from the position of the distance w2 shown in FIG. 8 to the first positioning guide 51 indicated by the arrow C based on the image information of the reading area Ve. Are sequentially read out, line scanning is performed to detect the front end of the document 60, and the distance w1 from the first positioning guide 51, that is, the size of the document 60 in the main scanning direction is detected. .

  This line scanning can be performed at a plurality of locations in the sub-scanning direction, and the average of the detected distances w1 can be calculated. Further, the front end of the document 60 can be detected by, for example, determining the shadow generated between the background document pressing sheet 37 and the front end of the document 60.

For this reason, the distance d1 from the second positioning guide 52 at which the line scanning is performed is shorter than the distance d2 from the second positioning guide 52 where the projecting portion 37a of the document pressing sheet 37 exceeds the first step 53. A first area longer than the distance d0 from the second positioning guide 52 to the end of the document pressing sheet 37, that is,
d2>d1> d0 (1)
Is set to
Here, the distances w1 to w4 of the respective parts from the second positioning guide 52 are,
w4>w3>w2> w1 (2-1)
Meet the relationship. Note that a region equal to or longer than the distance d2 corresponds to a second region.

  However, since it is assumed here that the detection is performed up to the horizontal document of the paper size B5, the distance d2 needs to be set to be less than 182 mm in the widthwise direction of the B5 paper. The protruding portion 37a is preferably formed to be easily warped as shown in FIG. 5 (a). Therefore, here, the first area from d0 to d2 is defined as the length of the document pressing sheet 37 in the longitudinal direction. It is recommended to set d (433 mm) in the range of 10% to 30%.

If the front end of the document 60 can be detected by the software processing without being disturbed by the data transition in the first step 53,
w4>w2>w3> w1 (2-2)
It is also possible to use

  Although the reading area Ve is set in the range shown in FIG. 8 here, the present invention is not limited to this, and image data satisfying the above-described expressions and capable of detecting the front end of the document 60 is used. Any image reading range can be obtained.

  Based on the detected distance w1 and the document detection information from the first paper sensor 48 and the second paper sensor 49, the control unit 100 determines the paper size and the placement direction of the document set on the document placing surface 43a of the contact glass 43. Identify.

  For example, when the distance w1 is 297 mm and the first paper sensor 48 and the second paper sensor 49 both detect paper, it is determined that the set original is A3 paper and is placed vertically, and the distance w1 is 297 mm. When only the first sheet sensor 48 detects a sheet, it is determined that the set document is A4 sheet and is placed horizontally. Similarly, it is possible to determine, for example, the paper sizes B5 (vertical / horizontal), A4 (vertical / horizontal), B4 (vertical), and A3 (vertical).

  In the present embodiment, in the course of the document size reading operation, the image of the reading area Ve indicated by the two-dot chain line in FIG. 8 is read and temporarily stored in the storage means, and then the stored image data is used as a basis. 8 shows a method of obtaining the paper size of the document, but the present invention is not limited to this. For example, the same method is used in the main scanning direction from the position of the distance w2 shown in FIG. The front end of the document 60 may be detected by directly analyzing the image data on the line.

  Further, in the present embodiment, the opening / closing unit 22 is configured to rotate around the rotation axis extending in the sub-scanning direction at the rear side of the mounting table frame 42; May be configured so as to rotate around a rotation axis extending in the main scanning direction at the end.

  As described above, according to the image reading unit 12 of the present embodiment, as shown in FIG. 8, the protruding portion 37a of the document pressing sheet 37 is located in the first area up to the distance d0 to the distance d2 in the sub-scanning direction. Is formed so as to overlap the mounting table frame 42 beyond the first step portion 53, so that line scanning is performed in this first area to detect the front end of the document 60, Up to the distance w3 can be set as the sheet detectable area in the main scanning direction.

  Incidentally, when the protruding portion 37a of the document pressing sheet 37 is not formed, the distance w0 of the front end of the sponge material 36 having the same outer shape other than the protruding portion 37a from the first positioning guide 51 is determined in the main scanning direction. , The paper detectable area in the main scanning direction is limited.

  Therefore, according to the image reading unit 12 of the present embodiment, by providing the protruding portion 37 a on the document pressing sheet 37, the paper detectable area in the main scanning direction is maximized up to the end of the second reading opening 46. Can be extended to In addition, since the sheet size can be determined by effectively using the document placing surface 43a to the maximum, it is not necessary to expand the document placing surface more than necessary, which can contribute to downsizing of the apparatus.

  Furthermore, the original pressing sheet 37 is formed of a flexible sheet-like member and has a protruding portion 37a having a limited width h at the leading end, which is not supported by the sponge material 36 and exists alone. It is possible to easily warp even under the influence of the step of the first step portion 53 shown in FIG. 9A, and it is possible to prevent the adhesion between the document pressing sheet 37 and the contact glass 43 from being impaired.

  Further, in the description of the above-described embodiment, words such as “up”, “down”, “left”, “right”, “front”, and “back” are used, but these are for convenience and It does not limit the absolute positional relationship in the state where the device is arranged.

  In the above-described embodiment, an example in which the present invention is applied to an image reading apparatus has been described. However, the present invention is not limited to this, and may be applied to an MFP (Multi Function Printer), a facsimile, a copying machine, and the like. Available.

  Reference Signs List 1 image forming apparatus, 11 image forming section, 12 image reading section, 13 main body frame, 13L left support section, 13R right support section, 21 flat bed unit, 22 opening / closing unit, 23 operation section, 31 original pressing section, 32 ADF, 35 pressing plate main body, 36 sponge material, 37 original pressing sheet, 37a projecting portion, 41 original reading sensor, 41a sensor portion, 41c guide projection, 41d guide projection, 42 mounting frame, 42L left support portion, 42R right support portion, 43 contact glass, 43a original placing surface, 44 support guide, 45 first reading opening, 46 second reading opening, 48 first paper sensor, 49 second paper sensor, 51 first positioning guide, 52 second positioning Guide, 53 First Stage , The second step portion 54, 60 document, 100 controller, 101 sensor driver, 103 opening and closing detector.

Claims (7)

A document placement unit for placing a document,
A holding unit that supports the document placing unit,
An image reading unit movably arranged in a first direction and reading an image of a document placed on the document placing unit;
An opening / closing unit that is provided to be freely openable and closable with respect to the document placing portion and the holding portion and includes a pressing member that presses the document placed on the document placing portion;
A drive control unit for driving and controlling the movement of the image reading unit and the image reading,
The holding unit and the document placing unit,
Forming a boundary extending in a second direction orthogonal to the first direction;
The pressing member,
When the opening / closing unit is in the closed position, the opening / closing unit has a protruding portion that is located on the side of the boundary and protrudes in the second direction.
The drive control unit includes:
After moving the image reading unit from the boundary in the first direction to a position corresponding to the protrusion of the pressing member when the opening / closing unit is at the closed position, the opening / closing unit An image reading device for reading size information of a document placed on the document placing portion in a process of moving the image reading portion from the position toward the boundary when the device is at a closed position. . The drive control unit includes:
When the open / close unit is at the open position, the image reading unit is moved from the boundary in the first direction to a position corresponding to the protrusion of the pressing member when the open / close unit is at the closed position. The image reading device according to claim 1, wherein the image reading device is moved to the position.   The image reading apparatus according to claim 1, wherein the holding unit includes a guide unit formed along the boundary to guide a document placed on the document placing unit.   The image reading apparatus according to claim 1, wherein the opening / closing unit includes a document pressing unit that holds the pressing member via an elastic member.   5. The image reading apparatus according to claim 4, wherein the pressing member is formed of a flexible member, and at least at the protruding portion is in a free state due to the absence of the opposing elastic member.   The image reading device according to claim 1, wherein the protruding portion includes an inclined portion disposed on a side opposite to the boundary and inclined with respect to the first direction. An image reading device according to any one of claims 1 to 6,
An image forming apparatus comprising: an image forming unit.

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