JP2001103243A - Image reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily remove a hand scanner from a main body. SOLUTION: While removing a scanner 201, a holder 301 is turned around a shaft 120 by a spring force and held in a state such that the inserting direction is upward. A user slides the scanner 201 toward the holder 301 while touching the scanner 201 onto a guide face 309 and stores the scanner 201 therein. The scanner 201 is removed from the guide face 309 while being completely stored, the holder 301 is turned downward by the weight and held at a position at which a sheet original is read.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus, and more particularly to an image reading apparatus detachably mounted on a main body.

[0002]

2. Description of the Related Art Conventionally, there has been proposed a home facsimile apparatus in which an image reading unit is detachable from a main body. When the image reading unit is attached to the main body, the sheet original conveyed by the paper feed mechanism is sequentially read as before, while, when the image reading unit is removed from the main body, the image reading unit is manually placed on the original. , It is possible to read a non-sheet-shaped document, for example, a book document. For example, JP-A-10-
A typical configuration proposed in 233898, JP-A-11-150617, and the like will be described.

FIG. 9 is a perspective view of a facsimile apparatus in which an image reading unit is detachable from a main body. In this apparatus, an image reading unit 91 and a main body 92 are connected by a cable 93, and information read by the image reading unit 91 is sent to a control board disposed in the main body via the cable 93, and an image processing circuit Transmitted or recorded via The image reading unit 91 is housed in a concave portion 94 formed in a lower part of the front surface of the main body. The image reading unit is slid in the direction of arrow G by engaging grooves 95 formed on both side surfaces of the image reading unit 91 with rails (not shown) formed in a concave portion 94 formed in the main body. Then, it is locked by a predetermined position. Further, the image reading unit 91 is housed so that the original reading surface thereof faces upward.
And the main body 96 do not interfere with each other, and are substantially parallel to the document conveying direction.

[0004]

However, the conventional attachment / detachment mechanism for pulling the image reading unit forward has the following drawbacks. In order to design the apparatus compactly, the document is conveyed in a direction from the rear upper surface to the front lower surface, and the image reading unit is housed at the front lower portion of the main body with the front lowering so as to be lower. Therefore, when the user pulls out the image reading unit with his / her hand, it is necessary to pull the image reading unit obliquely downward, and at that time, the hand may hit the installation surface. Therefore, it is necessary to arrange the image reading unit at such a height that the hand does not hit even if the image reading unit is pulled out diagonally downward. That is, it is necessary to provide a space below the image reading unit, and this configuration has a disadvantage that the main body cannot be made compact. In order to solve the problem, there is also a device in which a lever shape is formed in a part of the image reading unit so that the image reading unit is not touched with the ground surface even when the image reading unit is pulled out, and the lever is grasped and taken out. .
In such a configuration, when the book is read out by taking out the image reading unit, there is a drawback that the protrusion of the lever hinders the user from holding the image reading unit.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional example, and has as its object to provide an image reading apparatus having an image reading unit attaching / detaching mechanism which has good operability and a compact body.

[0006]

In order to achieve the above object, the present invention has the following arrangement. That is, a main body portion, an image reading portion detachably attached to the main body portion, a first position movably attached to the main body portion for attaching and detaching the image reading portion, and a stored image reading portion. And a holder for accommodating the image reading unit, which can take a second position for reading an image by attaching the image reading unit to the main body.

Preferably, the holder section is held at the first position when the image reading section is detached, and is held at the second position when the image reading section is stored. .

Preferably, the first position is above the second position, and the holder is held at the first position by an elastic member when the image reading unit is detached from the image reading unit. In the stored state of the reading device, the image reading unit and the holder member are held at the second position by their own weight.

[0009] Preferably, the holder is pivotally fixed to the main body, and is mounted so as to be rotatable around its axis.

[0010] Preferably, the main body portion is provided with the first body.
And a guide surface for guiding the image reading unit to the holder unit held at the position.

Preferably, the holder moves from the first position to the second position when the image reading unit is completely housed.

Preferably, the guide surface is in contact with the image reading section when the image reading section is stored in the holder section at the first position, and is separated from the image reading section when storage is completed. And the holder moves from the first position to the second position when the image reading unit is completely housed.

Preferably, when the image reading section is housed in the holder section and held at the second position, the guide surface is provided with a conveyance guide for conveying a document to the image reading apparatus. Surface.

Preferably, the main body further includes a document transport unit that transports a document so that an image is read by the image reading unit housed in the holder unit and held at the second position.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a facsimile apparatus provided with an image reading apparatus according to the present invention will be specifically described with reference to the drawings.

<Facsimile Mechanism> First, a schematic configuration of the facsimile apparatus will be described. In FIG. 1, the apparatus is laid out from the top of an operating unit A, a reading unit B, a recording unit C, and an electrical unit D from above.

The operation unit A includes a key 101 for operating each function of the facsimile, a panel cover 103 on which an LCD 102 for transmitting the state of the apparatus to the user and an LED window are arranged, and a screw inside the panel cover 103. It comprises a stopped operation board 104 on which electric components such as LCD and LED are mounted, and a rubber key. The rubber key is disposed below the key 101 between the panel cover 103 and the operation board 104, and when the user presses the key, the carbon pattern on the operation board 104 and the carbon contact printed on the back side of the rubber key come into contact with each other, and Is turned on to detect ON / OFF. The panel cover is attached to an upper document guide 105 described later.

Next, the configuration of the recording section C will be described. The plurality of recording sheets placed on the sheet feeding tray are separated and conveyed by the recording sheet feeding device 106. The printing unit 107 records the read information or the transmitted information on a recording sheet to be conveyed. The printed recording paper is discharged out of the main body by the discharge roller pair 108. Note that the printing unit 107 is configured by an ink jet recording method in which ink is ejected from a plurality of nozzles formed in the ink head 109 for recording. In this apparatus, the recording paper passing path is as shown by the arrow 110.

The electrical component D will be described. The electrical unit D is disposed below the recording unit C, and is partitioned by the main body frame 111, so that the recording unit C which is conductive due to a defect.
Is prevented from going to the electrical unit D even if the ink overflows. The electrical unit includes a control board 112 for controlling functions such as copying, facsimile communication, and telephone, and a control board 11
2 and a power supply 113 for supplying electricity to each device, a cordless board 114 for controlling an attached cordless cordless handset phone, and a bottom board 115 formed of a sheet metal to which the control board 112 and the power supply are attached. .

The reading section B will be described. Reading unit B
Is composed of a sheet transport section E disposed on the recording section C and an image reading section F disposed on the recording paper discharge path. It is configured to be conveyed toward.

The image reading section F includes an upper document guide 1 to be described later.
05 and the hand scanner 2
By making the hand scanner 201 detachable from the main body, the following two usage modes are enabled. One is a usage mode in which a sheet document is read with the hand scanner 201 attached to the main body. The other is a usage form of hand scanner reading in which the user scans the medium by removing the hand scanner 201 and tracing the medium by himself / herself. Sheet reading is effective when reading a plurality of cut-sheet originals or reading that requires precision, and hand-scanning reading is effective for reading a medium that is not conveyed by a sheet conveying device such as a magazine.

A hand scanner 201 controls a color contact sensor 202 for reading an image from a medium, a paper discharge roller 203, and stores the image data read by the color contact sensor 202 in a memory after converting and compressing the image data. Substrate 204 and color contact sensor 2
02, a battery 205 for supplying power to the control board 204, a connector 206 for connecting to the main body in a mounted state, and a movement amount of the hand scanner 201 which is connected to the discharge roller 203 and is determined from a rotation angle of the discharge roller. It comprises an encoder (not shown) composed of an actuator (not shown) and a photo interrupter, and a cover 207 for storing the above components. The sheet discharge roller 203 functions so as to sandwich the document S between a sheet discharge roller 116 to be described later and discharge the sheet outside the apparatus in sheet reading. Further, in the hand scanner reading, it functions to transmit the movement amount of the hand scanner to the encoder to synchronize the reading timing and to improve the straightness of the hand scanner.

The sheet transport section E is mounted on the document passing surface so as to be movable in the paper width direction, and has a slider 117 for restricting the setting position of a document of an arbitrary paper width size and suppressing skew, and a medium transport section. Form the upper guide of the road,
An upper document guide 10 serving as a support member for each member described later.
5, a lower document guide 118 attached to the upper document guide and forming a lower guide of the medium conveyance path, a separation unit 119 for separating and conveying the set media one by one,
It comprises a transport roller 120 for transporting the document to the reading position, a transport roller 121, and a discharge roller 116 for discharging the sheet medium out of the main body. Separation unit 119
Consists of a separation roller 122 rotatably supported by the upper document guide 105 via a bearing, a separation piece holder 123 mounted on the upper document guide 105, and a separation piece 124 mounted on the separation piece holder. The piece 124 is attached to the separation roller 122 via the separation piece holder 123 by a spring 125.
Is brought into contact. The transport roller 121 is rotatably mounted on a shaft supported by a rib formed on the upper document guide 105 so as to be movable in the vertical direction. Since the shaft is urged in the K direction by a roller pressing spring 126 screwed to the upper document guide 105, the transport rollers 121 are pressed against the transport rollers 120. The transport roller 120 is attached via a bearing to a drive board (not shown) and a side plate attached outside the document transport path on the frame 111. The discharge roller 116 is pressed against the discharge roller 203 by a roller pressing spring 126 via a cylindrical discharge roller bearing passed through a shaft. The paper discharge roller bearing is supported to be vertically movable by being sandwiched between ribs (not shown) of the upper document guide 105.

Next, the sheet reading operation in the above configuration will be described. First, along the slider 117 set to the width of the document, the leading edge of the document is set on a wedge formed by the separation roller 122 and the separation piece 124. Also,
In the original setting state, the original presence / absence sensor 127 and the original width sensor are turned on, and the apparatus enters a reading standby state. When a reading start signal is sent by a user operation, the separation roller 12
2. The conveyance roller 120 and the discharge roller 116 start rotating by a motor (not shown). Then, a fixed size original is separated one by one by a separating unit, and a special paper of a fixed size or less such as a photograph or a business card is conveyed by a preliminary press-contact arm and a separation roller and sent to the conveying roller 120. . The transported document is transported by a transport roller 120.
Is turned on. Further, the conveyed document is pressed against the surface of the contact sensor 202 by the weight of the white reference 115 made of a sheet metal and a white paper-like member, and the paper discharge roller 1 is scanned while reading the image data.
It is sent to 16 and discharged out of the apparatus.

<Attachment / detachment mechanism of hand scanner> Next, the attachment / detachment mechanism of the hand scanner will be described in detail with reference to the drawings. FIG. 2 is a perspective view when the hand scanner is removed,
FIG. 3 is a perspective view when the hand scanner holder is taken out to explain the configuration. 2 and 3, the upper document guide 105 and the operation unit A are omitted for easy understanding of the configuration of the attachment / detachment mechanism. The upper document guide 105 and the operation unit A can be opened using the shaft 105a in FIG. 1 as a rotation axis. Note that the upper document guide is opened in advance when the hand scanner 201 is attached or detached.

In FIGS. 2 and 3, the hand scanner holder 301 is rotatably mounted on the conveying roller 120 by passing the shaft of the conveying roller 120 through a hole 301a provided at a position opposing each other on both side plates 301b. Has been stopped. The hole 301 of the hand scanner holder 301
a is loosely fitted with a certain play to the transport roller 120 serving as a shaft. In the present invention, the diameter of the hole 301a of the hand scanner holder is 0.8 mm larger than the shaft diameter of the transport roller. The torsion coil spring 302 is supported by the transport roller 120, and has one end fixed to the side plate and the other end fixed to the side surface of the hand scanner holder.

A projection 304 is formed on a surface 303a of the cover 303 surrounding the hand scanner holder 301, which faces both side walls of the hand scanner holder 301. The protrusion 304 is formed such that a surface 304a at the tip thereof has a predetermined gap with the side wall 301b of the hand scanner holder, thereby forming the protrusion 304 in the width direction of the hand scanner 201 (arrow 3).
05) is roughly regulated. Also, a stopper rib 30 formed on the side wall of the hand scanner holder is provided.
1c and the side surface 304b of the projection regulate the hand scanner holder 301 to rotate within a predetermined range.

In the above configuration, the torsion coil spring 30
2 is designed so that a spring force acts to rotate the hand scanner holder 301 in the direction of the arrow 306.
The spring constant of the torsion coil spring 302 is such that when the hand scanner 201 is detached, the hand scanner holder 301 is lifted up and abuts against a stopper (not shown) to be held at a detachable position (FIG. 2). In the mounted state, the hand scanner holder 30
1 is the weight of the hand scanner 201 and the weight of the spring 30
Hand scanner 201
Is held at the reading position of the sheet document.

Rails 307 are formed inside the side walls on both sides of the hand scanner holder 301, and grooves 308 are formed on both side walls of the hand scanner. When the hand scanner 201 is inserted into the hand scanner holder 301 along the rail, first, the rail 3 is used in both the vertical direction and the width direction.
07 and the groove 308, there is no play at least after contact between the connector 206 and a connector 311 described later, and the shape of the rail and the groove is adjusted so that the relative positions of the connector 206 and the connector 311 are surely matched. Is determined. The direction of the rail 307 is determined by the connectors 311 and 206.
And the height is substantially the same as the outer peripheral surface of the transport roller 120 and the glass surface of the color contact sensor 202 disposed on the hand scanner 201 when the hand scanner 201 is mounted. The height has been adjusted.

A guide surface 309 is formed integrally with the cover 303 at the front of the main body. Guide surface 30
Reference numeral 9 functions as a document conveyance guide when reading a sheet document, and serves as a guide for engaging the groove 308 of the hand scanner 201 with the rail 307 of the hand scanner holder 301 held at the detachable position when the hand scanner is attached. When the hand scanner 201 is removed, the hand scanner holder 301 is held at a detachable position (the state shown in FIG. 2) by the torsion coil spring 302.
Low holding power. For this reason, when aligning the groove 308 with the rail 307, the holder 301 escapes downward, making it difficult to set the hand scanner. Therefore, the guide surface 309
Is provided. The position of the guide surface 309 is adjusted such that the groove 307 and the rail 308 are engaged simply by placing the hand scanner 201 on the guide surface 309 and sliding the hand scanner 201 in the direction of mounting the hand scanner holder 301 as it is (FIG. 4, FIG. 5).

The lower surface 201 of the hand scanner 201
When a completely exceeds the guide surface (FIG. 7), a connector to be described later is connected, and the hand scanner 201 is designed to be completely housed in the hand scanner holder 301. It cannot be lowered. This prevents the user from mounting errors. In addition, the guide surface 309 is arranged in front of the hand scanner and shared with the document transport guide, thereby reducing the size of the apparatus in the width direction.

A large notch 301d is formed in the center of the bottom of the hand scanner holder. this is,
This is because when the operator grips the hand scanner 201 and inserts or removes it from the hand scanner holder 301, the hand may hit if the bottom surface 301f of the hand scanner holder is over the entire surface. In addition, when the user leaves, it is hidden behind the hand scanner and cannot be seen at all.

As described above, the recording paper of this apparatus is discharged from the lower part hidden by the hand scanner. Therefore, when a short recording paper is ejected, or when the recording paper has a paper jam or the like and its leading end slightly comes out of the pair of ejection rollers 108, the operation unit is opened and the hand scanner is removed. The processing is performed after making the recording paper discharge port 129 easy to access. At this time, a notch 301d is also provided so that the bottom surface 301f of the hand scanner holder does not get in the way. Further, the notch 301d increases the space 128 (see FIG. 1) below the hand scanner 201 accommodated in the hand scanner holder 301, and improves the stacking performance of the recording paper and the discharge performance when the recording paper is curled. it can.

The hand scanner holder 301 has
An interface board 312 and a connector 311 that engages with the connector 206 are attached. When the hand scanner 201 is housed in the hand scanner holder 301, the control board 1 in the main body is connected via a cable (not shown) attached to the interface board 312.
12 is connected.

The interface board 312 is attached from the hand scanner side to the surface 301e of the hand scanner holder 301 which is the boundary with the recording unit. Also,
There is a hole in the surface 301e where the interface board 312 is attached, through which a cable passes. In this state, only the hole is exposed to the recording unit side. Further, the interface substrate 312 is formed on a single-sided substrate, and the surface 31 facing the hand scanner 102 is formed.
2a is attached to the hand scanner holder 301 so that the solder surface and the surface 312b facing the recording section C become the mounting surface. For this reason, the conductive ink mist flying from the ink jet recording unit is supplied to the substrate 31 from the hole.
Even if it adheres to 2, the pattern is short-circuited and does not emit smoke or fire because it is a mounting surface and has no pattern.

<Method of Attaching Hand Scanner> Next, a method of attaching the hand scanner and positioning with the main body will be described.

FIGS. 4 to 8 show the steps of attaching the hand scanner in a step-by-step manner, and show only those parts necessary for making the mechanism easy to understand. The hand scanner is mounted and positioned on the main body in three steps.

First, the operator operates the upper document guide 105.
Open until it is secured with the stopper. Then, the hand scanner holder 301 stops in a state where it has been raised to the detachable position as described above (FIG. 4). Next, the hand scanner 201 is slid toward the inner side of the holder with the hand scanner 201 placed on the guide surface 309, and then slid along the rail 307 to be attached to the hand scanner holder 301 (FIGS. 5 to 7). As described above, the hand scanner 201 uses the rail 307 and the groove 308 to hold the hand scanner holder 3.
01 and the connector 206 and the connector 311
Is securely connected.

In this state, the hand scanner 201 is integrated with the hand scanner holder 301 and
It freely moves in the rotational direction 401 shown in FIG. Next, the hand scanner holder 30
1. The hand scanner 201 integrated with the transfer roller 1
Rotate about 20 and lower it to the reading position (FIG. 8). Here, the position of the hand scanner 201 in the downward direction is determined by abutting the surface 201a on the rib 402 formed on the main body frame, and the position in the front-rear direction is determined by sandwiching the hand scanner 201 between the surface 403 and the rib 404.
The surface 403 is formed obliquely so as not to interfere with the rotation of the hand scanner. In other words, hand scanner 2
When 01 is lowered, the hand scanner 201 comes into contact with the surface 403 and the position is inevitably determined. The hand scanner holder 301 is rotatable in the upward direction. However, when the upper document guide 105 is closed, the hand scanner holder 301 is urged by the paper discharge roller 116 to completely determine the position.

With the above configuration, the hand scanner 2
01 is in contact with the main body frame when it is stored, that is, in the state of reading a sheet document, and its relative position is directly determined with respect to the main body frame. For this reason, the positional deviation between the paper feed roller 120 and the document end detection sensor 127 attached to the main body frame 111 can be minimized. As a result, image quality such as a reading position and skew is improved. If the connector 206 and the connector 311 are not connected, the hand scanner 201 is moved to the hand scanner holder 301.
Therefore, the connector 206 and the connector 311 are securely connected at the time of reading a sheet document.

Further, since the hand scanner holder 301 and the main body are axially fixed with a certain play, the position of the hand scanner 201 in the housed state is set at the position of the transport roller which is the rotation axis of the hand scanner holder 301. You will not be bound. The position of the hand scanner 201 is the same as that of the hand scanner 201 and the surfaces 403 and 4 in the front-back direction.
The horizontal direction is determined by the hand scanner 201, the side wall of the holder 301, and the projection 304 of the main body. The vertical direction is determined by the rail 307 of the hand scanner, the groove 308 of the holder, the surface 402 of the main body, and the upper document guide. 105. That is, the hand scanner 201 is not positioned twice. For this reason, since no extra external force acts on the connector or the like, troubles such as defective contacts are eliminated.

<Method of Removing Hand Scanner> Next, the removal of the hand scanner 201 will be described. First,
Open the upper document guide 105 until it is fixed by the stopper. In this state, the operator holds the hand scanner 201,
Lift the hand scanner holder 301 until it catches on the stopper. When the hand scanner holder 301 is hooked on the stopper, the hand scanner holder 301 is in a state where the hand scanner can be attached and detached, as shown in FIG. Then, the hand scanner 201 is pulled out while being lifted.

As described above, the facsimile apparatus of this embodiment can be used by taking out the hand scanner or by attaching the hand scanner to the main body. Since the holder member that houses the hand scanner is movably attached to the main body, even in a facsimile apparatus that stores the hand scanner below the front of the main body with the front lower, it is possible to move the holder member by moving the holder member. The direction in which the hand scanner is taken out can be arbitrarily set to the direction in which the hand scanner is most easily taken out. This makes it possible to provide a compact image reading device with good detachability.

When the hand scanner is detached, the holder is held in the detached position by the elastic member, so that the holder can be easily and smoothly stored without being conscious of the position of the holder member. Furthermore, since the image reading unit and the holder member automatically move to the reading position after storage, unnecessary operations by the user can be omitted, user mistakes are prevented, operation is easy, and stable reading performance is achieved. Can be provided.

Further, the guide surface allows the rail of the hand scanner and the groove of the holder member to be easily accommodated in the holder of the hand scanner without being aligned.

When the hand scanner is not completely housed in the holder member, the hand scanner cannot be moved to the reading position of the sheet document.
It is possible to prevent a user's mounting error.

[0047]

As described above, according to the present invention,
It is possible to provide an image reading apparatus having an image reading unit attaching / detaching mechanism with good operability and a compact main body.

Further, the holder of the image reading section can be oriented in the direction in which the image reading apparatus can be most easily detached, so that a compact image reading apparatus with good detachability can be provided.

Further, the position of the holder member is moved to an optimal position by a simple mechanism in each of the state where the image reading apparatus is mounted and the state where the image reading apparatus is removed, so that unnecessary operation by the user is omitted. It is possible to prevent mistakes, to provide easy operation and stable performance, and to prevent the image reading unit from being stored in an incomplete state.

Further, by providing the guide mechanism, the image reading section can be easily stored in the holder member.

[Brief description of the drawings]

FIG. 1 is a main cross-sectional view illustrating a facsimile apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view illustrating an attaching / detaching mechanism according to the embodiment of the present invention.

FIG. 3 is a perspective view illustrating an attaching / detaching mechanism according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view illustrating attachment / detachment and positioning of the attachment / detachment mechanism according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view for explaining attachment / detachment and positioning of the attachment / detachment mechanism according to the embodiment of the present invention.

FIG. 6 is a cross-sectional view for explaining attachment / detachment and positioning of the attachment / detachment mechanism according to the embodiment of the present invention.

FIG. 7 is a cross-sectional view for explaining attachment / detachment and positioning of the attachment / detachment mechanism according to the embodiment of the present invention.

FIG. 8 is a cross-sectional view for explaining attachment / detachment and positioning of the attachment / detachment mechanism according to the embodiment of the present invention.

FIG. 9 is a diagram illustrating a conventional example.

[Explanation of symbols]

 Reference Signs List 120 transport roller 201 hand scanner 301 hand scanner holder 302 torsion coil spring 309 guide surface

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshiaki Suzuki 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Katsumi Obana 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon (72) Inventor Kazuyuki Morinaga 3-30-2 Shimomaruko, Ota-ku, Tokyo F-term (reference) 4E352 BB02 BB05 DD02 DD05 FF11 GG15 5B047 AA01 BA03 BC18 CB06 5C072 AA01 BA20 NA01 PA09 VA06

Claims (9)

[Claims] An image reading unit detachably attached to the body unit; a first position movably attached to the body unit for attaching and detaching the image reading unit; An image reading apparatus, comprising: a holder section for accommodating the image reading section, which can take a second position for reading an image by mounting the image reading section on the main body section. 2. The image forming apparatus according to claim 1, wherein the holder is held at the first position when the image reading unit is detached, and is held at the second position when the image reading unit is stored. The image reading device according to claim 1, wherein: 3. The image reading device according to claim 1, wherein the first position is above the second position, and the holder is held at the first position by an elastic member when the image reading unit is detached. 3. The image reading apparatus according to claim 2, wherein in the stored state, the image reading unit and the holder member are held at the second position by their own weight. 4. The image reading apparatus according to claim 1, wherein the holder is fixed to the main body so as to be rotatable around the axis. 5. The image forming apparatus according to claim 1, wherein the main body has a guide surface for guiding the image reading unit to the holder held at the first position. Image reading device. 6. The apparatus according to claim 1, wherein the holder moves from a first position to a second position when the image reading unit is completely housed. Image reading device. 7. The guide surface is provided at a position where the guide surface comes into contact with the image reading unit when the image reading unit is stored in the holder unit at the first position, and separates when the storage is completed. The image reading apparatus according to claim 5, wherein the holder moves from the first position to the second position when the image reading unit is completely housed. 8. When the image reading unit is housed in the holder unit and held at the second position, the guide surface is provided with a conveyance guide surface for conveying a document to the image reading device. The image reading apparatus according to claim 5, wherein: 9. The image forming apparatus according to claim 1, wherein the main body unit further includes a document conveying unit that conveys a document so as to read an image by the image reading unit stored in the holder unit and held at the second position. The image reading device according to claim 2.