JPH0662181A - Image reader - Google Patents

Abstract

PURPOSE:To miniaturize the device and to reduce cost while holding expandibility by controlling a driving part corresponding to the original detecting state of a sensor provided at the original entrance of a read part by using the sensor in both of a self running mode and a manual inserting mode. CONSTITUTION:An original entrance 14 of a read part 1 is provided with a lever type sensor 15 to detect originals inserted in the entrance. This device is provided with a manual inserting mode 1 to read the original manually inserted to the original entrance 14 in the state of coupling the read part 1 and a conveyance part 2 as an automatic paper feeding mode, and the self running mode to read the originals while placing the read part 1 on the original and self running it on the original, and the respective modes are switched by a personal computer to perform image processing. In the respective modes of the self running mode and the manual inserting mode, the drive of the driving part composed of a motor 11, pulleys 40, 13A and 13B and conveyance rollers 5A and 5B or the like is controlled corresponding to the original detecting state of the sensor 15. Thus, various use forms can be dealt with only by one sensor.

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 in which a reading unit for reading an image formed on a document and a document conveying unit are detachable.

[0002]

2. Description of the Related Art Conventionally, an image reading apparatus of this type is disclosed in, for example, Japanese Patent Application Laid-Open No. 2-22958.

In this image reading apparatus, in the case of a sheet-shaped original of a normal size, the reading section is integrally connected to the conveyance section and the original conveyance path is provided between the reading section and the conveyance section. To convey the original and read the image on the original.

On the other hand, in the case of a book or a particularly large sheet original, the reading unit is separated from the conveying unit, and the reading unit is moved along the original to read an image.

[0005]

By the way, in the above-mentioned conventional image reading apparatus, a manual feed mode for reading an image in a state where the reading unit and the conveying unit are integrally connected, and an image for reading the image by separating the reading unit are read. When switching between the self-propelled mode and the use, a sensor for switching these modes is required.

Specifically, a sensor is required to detect whether or not the transport unit is connected to the reading unit.

On the other hand, the manual feed mode requires a sensor for detecting the insertion of the original.

Further, when an automatic paper feeder for separating and feeding a plurality of originals one by one is used in combination, a sensor for detecting the combination of the automatic paper feeders is required. .

However, this type of image reading apparatus is used only in the reading section, in which the reading section and the conveying section are integrally used, or in which an automatic sheet feeding device is connected as necessary. There are various types of usages, such as the usage, and these are highly expandable and can be freely selected by the user. Therefore, when a plurality of sensors are permanently installed in the reading unit in order to cope with such various usage patterns, the configuration of the reading unit becomes complicated, which causes an increase in cost. Further, in the case of using only the reading unit, there is an unnecessary sensor, which causes not only an increase in cost but also an increase in failure factors, a decrease in reliability, and an obstacle to miniaturization. .

The present invention solves such a situation, and an object thereof is to provide a highly reliable image reading apparatus which promotes downsizing and cost reduction while maintaining expandability.

[0011]

In order to achieve the above object, in the present invention, one sensor provided at the document entrance of the reading section is used in each mode.

That is, a reading unit for reading an image of a document that moves relatively by the rotation of a rotating body driven by a driving unit, and a sensor attached to the reading unit for detecting the document are provided.

In addition to the above, there are provided a conveying unit which is detachably attached to the reading unit and which contacts the rotating body to convey an original, and a rotating body which is placed on the original and is driven by the driving unit. Switching means for switching between a self-propelled mode for reading an image of a document while moving the reading unit by rotation and a manual mode for reading the document while moving the reading unit and the conveying unit, and a switching unit And a control unit that controls the drive of the drive unit according to the document detection state of the sensor in each mode switched by the unit.

Alternatively, it has a conveying member which is detachably attached to the reading section and contacts the rotating body to convey an original, and is driven by the driving section to make a plurality of originals one by one.
A sheet feeding unit that separates the sheet into sheets and supplies the sheet between the reading unit and the transport member, and a reading unit that is placed on an original document and is rotated by a rotating body driven by the driving unit to move the reading unit. Switching means for switching between a self-propelled mode for reading an image of an original while reading and an automatic paper feed mode for reading a plurality of originals while separating the original into a single sheet in a state where the reading unit and the paper feeding unit are combined, And a control unit that controls the drive of the drive unit according to the document detection state of the sensor in each mode switched by the switching unit.

Alternatively, a conveying section which is detachable from the reading section and contacts the rotating body to convey an original, and a detachable section which is detachably attached to the reading section and driven by the driving section, separates a plurality of originals into one sheet. And a document feeding unit that feeds between the reading unit and the conveying unit, and the reading unit is moved by the rotation of a rotating body driven by the driving unit with the reading unit placed on the document. , A self-propelled mode for reading an image, a manual feed mode for reading an original while moving the document in a state where the reading unit and the conveying unit are combined, and a state in which the reading unit, the conveying unit, and the sheet feeding unit are combined Switching means for switching between an automatic paper feed mode for reading a plurality of originals while separating them into one, and the originals of the sensor in each mode switched by this switching means. Depending on the out state provided a control means for controlling the driving of the driving unit.

[0016]

In the above configuration, in the usage mode of only the reading unit, if the sensor is turned on, it can be determined that the reading unit is placed on the original, and therefore the reading is started based on this condition.

Next, in the mode in which the reading unit and the conveying unit are used in combination, if the sensor is turned on, it can be determined that a document has been inserted between the reading unit and the conveying unit. Start reading.

Next, in the mode in which the feeding unit and the paper feeding unit are connected to the reading unit, if the sensor is turned on, it is determined that the document is automatically fed between the reading unit and the feeding unit. It is possible to start reading under this condition.

Therefore, it is possible to deal with various usage patterns with only one sensor.

[0020]

Embodiments of the present invention will now be described with reference to the drawings.

<Structure> FIGS. 1 and 2 are a plan view and a side view showing an embodiment of an image reading apparatus to which the present invention is applied. A reading unit 1 for reading an image of a document and a detachable unit for the reading unit 1 are shown. A conveyance unit 2 that freely conveys a document while being attached to the reading unit 1, and a document that is automatically attached between the reading unit 1 and the conveyance unit 2 when detachably attached to the conveyance unit 2 and attached to the conveyance unit 2 The tray 4 which is composed of a paper feeding unit 3 for feeding paper and is rotatably attached to the paper feeding unit 3 can be folded on the reading unit 2 as shown in FIG.

In this image reading apparatus, as shown in FIG. 4, a plurality of originals set in the paper feeding unit 3 are fed one by one in a state where the reading unit 1, the conveying unit 2 and the paper feeding unit 3 are combined. In the automatic paper feed mode for reading an image while separating and automatically feeding the paper, and in a state in which the reading unit 1 and the transport unit 2 are combined as shown in FIGS. 5 and 6, the document manually inserted into the document entrance 14 is read. A manual feed mode and a self-propelled mode in which the reading unit 1 is placed on a document and the document is read while the document is self-propelled as shown in FIGS. 7 and 8.

A switching means for switching the automatic paper feed mode, the manual feed mode, and the self-propelled mode is provided in an image processing apparatus (control means) (not shown) such as a personal computer to which the reading section 1 is connected and which performs image processing. ing. The switching unit may be provided in the reading unit 1.

The reading unit 1 is covered with a cover 10 as shown in FIGS. 6, 9 and 10, and a motor 11 as a drive source and a pulley 40 attached to the rotary shaft of the motor 11 are provided inside the cover 10. , A pair of front and rear pulleys 13A, 13
B, a timing belt 12 that is hung on the pulleys 40, 13A, and 13B to drive the pair of pulleys 13A and 13B in the arrow direction, a tension roller 41 that presses the timing belt 12, and a rotation shaft 55 of the pulleys 13A and 13B.
Transport roller 5A attached to 56 and driven to rotate,
5B (rotating body) and a contact-type image sensor 6 (reading means) which is arranged between the transport rollers 5A and 5B and is mounted such that the light-receiving surface faces the transport unit 2 direction.
A lever-type sensor 15 (detection means) that is attached to the document entrance 14 and detects a document inserted from here is provided.

A gear 42 for transmitting drive to the sheet feeding section 3 is attached to one end of the rotary shaft 55.

As shown in FIG. 22, the sensor 15 detects that the leading edge or trailing edge of the original document is off when the leading edge of the sensor 15 is lowered downward (non-detection of the original document) as shown in FIG. It also has a function to prevent the part 1 from falling from the end of a book or desk while moving, and when the sensor 15 turns off during self-running, the motor 11 is stopped and a sound or light warning is issued. There is. Therefore, the sensor 15 is provided ahead of the image sensor 6 in the moving direction. In addition, the sensor 15
Is provided in front of the center of gravity in the moving direction, and the sensor 15
Is turned off and the reading unit 1 is stopped, the center of gravity is left on the image reading surface.

As shown in FIG. 10, the bottom surface (guide member) of the cover 10 of the reading section 1 is provided with coupling holes 51, 52, 53 and 54 for coupling with the transport section 2. Since the bottom surface of the cover 10 faces the document, it also has a function of a guide for guiding the document.

Further, the rotating shafts 55 and 56, the image sensor 6, the motor 11, the sensor 15 and the like are attached to a frame 17 shown in FIG.
The cover 10 is urged in the direction away from the document surface by the left and right compression springs 16 mounted between the cover 10 and the.
Reference numeral 57 is a rod for supporting the compression spring 16, 58 is a stopper attached to the tip of the rod 57 for restricting one end of the compression spring 57, and 59 is a side plate for fixing the motor 11 to the frame 17.

The compression spring 16 covers the cover 1 in the self-propelled mode.
In order to raise the distance between the bottom surface of the cover 10 and the conveying surface by raising 0 so that the front end of the cover 10 in the moving direction and the bottom surface of the cover 10 do not easily come into contact with the document and do not hinder the self-running of the reading unit 1. Is.

When the reading unit 1 and the conveying unit 2 are combined, the rollers 20A and 20B of the conveying unit 2 described later press the conveying rollers 5A and 5B, whereby the conveying rollers 5A and 5B and the image sensor 6 are connected. The motor 11, the sensor 15 and the like are retracted to a predetermined position inside the cover 10.

The transport unit 2 is shown in FIGS. 6, 12, 13, and 14.
It is covered with a cover 22 like the
When the is coupled to the reading unit 1, the pair of rollers 20A and 20B contact the transport rollers 5A and 5B and rotate following the transport rollers 5A and 5B to move the document, and the document is placed on the light receiving surface of the image sensor 6. A pressing member 21 to be in close contact with,
Attaching the paper feed unit 3 and the inverted L-shaped coupling protrusions 61, 62, 63, 64 that engage the coupling holes 51, 52, 53, 54 of the reading unit 1 to couple the conveying unit 2 to the reading unit 1. Connecting members 8A, 8B, 8C, 8D, 8E which will be described later
Mounting holes 65, 66, and 67 into which are inserted.

The reading unit 1 and the conveying unit 2 are connected to each other by, for example, inserting a connecting special note 62 into the connecting hole 51 and then horizontally shifting it as shown in FIG.

As shown in FIGS. 16 and 17, the sheet feeding section 3 is inserted into the mounting holes 65, 66, 67 of the conveying section 2 to connect the conveying section 2 and the sheet feeding section 3 with connecting members 8A, 8B ,. 8C,
8D, 8E, a gear 7 that receives a rotational driving force from the gear 42 attached to the rotation shaft 55 of the pulley 13A, a gear 43 attached to the rotation shaft of the gear 7, and a gear 4
3, a paper feed roller 30 provided coaxially with the gear 44, and a spring 4 attached to the paper feed roller 30.
Separation pad 31 pressed by 5 and pressing member 2 made of white synthetic resin that presses the document against image sensor 6
1 is provided, and the originals stacked on the tray 4 are separated one by one by the paper feed roller 30 and the separation pad 31 and sent out to be supplied to the conveyance path between the conveyance rollers 5A and 5B and the rollers 20A and 20B. Is configured.

The image reading apparatus configured as described above is connected to an image processing apparatus such as a personal computer, receives a read command from the image reading apparatus, reads an original image, and transfers the read image data to the image processing apparatus. Is configured as follows.

<Operation> The operation of the image reading apparatus described above will be described by dividing it into three modes: (1) automatic paper feed mode, (2) manual feed mode, and (3) self-propelled mode.

(1) Automatic paper feeding mode As shown in FIG. 18, a plurality of originals 100 are stacked on the tray 4 of the paper feeding unit 3 in a state where the reading unit 1, the conveying unit 2 and the paper feeding unit 3 are combined. To do. When a reading command is given from the image processing apparatus in this state, the motor 1 is used to separate and feed the document.
1 is driven. Then, the rotational driving force of the motor 11 is transmitted to the paper feed roller 30 via the gear 7, and the plurality of originals stacked on the tray 4 are rotated by the rotation of the paper feed roller 30 in the feeding direction (counterclockwise). The top few of them are pulled out.

These several originals are sent between the separation pad 31 pressed against the paper feed roller 30 and the paper feed roller 30, where only the uppermost one is separated and the original entrance 1
Sent to 4.

The document 100 sent to the document entrance 14 is further fed, and its leading end reaches the position of the sensor 15.
Then, the front end of the document 100 presses the sensor 15 in the conveying direction, and the sensor 15 is turned on. When the sensor 15 is turned on, the rotation amount of the motor 11 from when the sensor 15 is turned on is counted by a control unit (not shown). When the motor 11 rotates by a predetermined rotation amount and the leading edge of the original 100 is conveyed to a position where it is pressed by the conveying roller 5A and the roller 20A by the pressing member 21, a reading command is issued and the original 100 is pressed by the pressing member 21. The original image is read by the image sensor 6 while being conveyed as shown in FIG.

Then, the trailing edge of the original passes the sensor 15,
When the sensor 15 is turned off, the motor 11 is driven for a predetermined time or a predetermined amount thereafter, the image reaching the trailing edge of the document 100 is read, and then the document is discharged from the document exit 19.

When it is time to discharge the document from the document discharge port 19, the motor 11 is stopped and returns to the initial state.
When the succeeding original document 100 remains on the tray 4, when the trailing end of the original document 100 passes through the paper feed roller 30, the next original document is continuously sent out and the above operation is performed.

(2) Manual feeding mode As shown in FIG. 20, the document 100 is inserted into the document entrance 14 with the reading unit 1 and the transport unit 2 coupled to each other. Then, the front end of the document 100 presses the sensor 15 in the conveying direction, and the sensor 15 is turned on. When the sensor 15 is turned on, a drive signal is sent from the control unit (not shown) to the motor 11, the motor 11 is rotated, and the document 100 is transported by the transport rollers 5A and 20A, and the leading end of the document 100 is transported to the reading start position. Predetermined amount of motor 11
When the document is transferred, the document image is read by the image sensor 6 while the document 100 is in close contact with the light receiving surface of the image sensor 6 by the pressing member 21.

Then, the trailing edge of the document passes through the sensor 15,
When the sensor 15 is turned off, the motor 11 is driven for a predetermined time thereafter, the image reaching the rear end of the document 100 is read, and then the document is discharged from the document exit 19.

When it is time to discharge the document from the document discharge port 19, the motor 11 is stopped and returns to the initial state.

(3) Self-propelled mode The reading unit 1 with the transport unit 2 separated as shown in FIG.
Is placed on the original 101 such as a book. At this time, the reading unit 1 is supported on the original 101 by the transport rollers 5A and 5B.

When the reading unit 1 is supported on the original 101, the sensor 15 is pushed by the original and is turned on. In this state, when a drive signal is issued from the control unit (not shown) to the motor 11, the motor 11 rotates by a predetermined rotation amount, and the reading unit 1 moves on the original 101 to convey rollers 5A, 5A.
Self-propelled by the rotation of B. In the self-propelled process, the original image is read by the image sensor 6.

At this time, the frame 17 is urged toward the bottom side by the compression spring 16 attached to the cover 10. Therefore, when the conveying section 2 is separated, the conveying rollers 5A, 5
B, the image sensor 6, the sensor 15 and the like relatively project from the floor surface of the cover 10, and the distance between the bottom surface of the cover 10 and the original 101 is wider than in the automatic paper feeding mode, and the cover 10 is read by the reading unit 1. There is no obstacle to self-propelled, and it can be self-propelled smoothly.

When the reading unit 1 reaches the rear end of the original 101 as shown in FIG. 22, the sensor 15 is turned off. Then, the driving of the motor 11 is stopped immediately or after a predetermined rotation by the control means (not shown) to stop the self-propelled driving, and sound or light is emitted to notify the operator of the danger.

Therefore, the reading unit 1 does not drop from the original 101 or the desk on which the original 101 is placed.

<Modification> The present invention is not limited to the above-mentioned embodiment, and the following modifications are possible, for example.

(1) In the above-described embodiment, the configuration in which the reading unit 1, the conveying unit 2, and the paper feeding unit 3 are all provided has been described, but the combination of the reading unit 1 and the conveying unit 2, the reading unit 1 and the feeding unit 3. It is also possible to take a combined form such as a configuration in which the paper unit 3 is integrated.

(2) The paper feeding unit 3 is designed to rotate by receiving the rotational driving force from the carrying roller 5A, but it may be configured to have its own driving source.

(3) The image sensor 6 has a structure for directly receiving an image from a document, but it may have a structure in which a reduction or expansion optical system is added to the light receiving optical path of the image sensor 6.

(4) In the above embodiment, the image reading apparatus provided with the reading unit 1, the conveying unit 2 and the paper feeding unit 3 is shown. However, the present invention is an image having only the reading unit 1 which is self-propelled on a document. It can also be applied to readers.

(5) When the detection means detects a height difference of a predetermined value or more, the control means stops the drive section to stop the movement, and then the drive section is rotated in the reverse direction to reverse the moving direction, thereby causing an abnormal conveyance surface. You may make it evacuate from.

(6) The detecting means is not limited to the lever type sensor 15, but uses a light emitting portion that emits light and a light receiving portion that receives light returning from the light emitted from this light emitting portion. Alternatively, when the amount of light received by the light receiving unit changes by a predetermined amount or more, it may be determined that there is a large drop, a wrinkle of the document, a curvature of the document surface, or the like in the front direction of movement.

(7) In the above embodiment, the entire cover 10 is raised from the image reading surface in the self-propelled mode. However, the cover 10 is divided into a bottom cover 10A and a top cover 10B as shown in FIG. Divide and cover the top side 10
B is fixed to the frame 17 of FIG. 11, and the bottom side cover 10
By mounting A in the same manner as the cover 10, the bottom cover 1 which is easy to contact the image reading surface in the self-propelled mode
Only 0A may be raised. It should be noted that an inclined surface 10C may be formed so that the front side in the moving direction is less likely to contact the image reading surface.

(8) In the embodiment or the modified example of (7), the surface of the reading unit 1 facing the image reading surface is covered with a cover except the conveying rollers 5A and 5B, the image sensor 6 and the sensor 15. The cover may cover only the front end side and the rear end side in the moving direction. In this case, a guide member may be provided at a predetermined position between the front end side and the rear end side of the cover bottom surface.

[0058]

As is apparent from the above description, according to the present invention, the reading which reads the image of the document which has the sensor for detecting the document and which is relatively moved by the rotation of the rotating body driven by the driving unit. And a conveyance unit that is detachably attached to the reading unit and that conveys a document by contacting the rotating body.
A sheet feeding unit that is detachably attached to the reading unit and driven by the driving unit, separates a plurality of documents into one and supplies the document between the reading unit and the conveying unit, and switches the reading unit by the switching unit. A self-propelled mode in which an image of a document is read while moving the reading unit by rotation of a rotating body driven by the driving unit and the reading unit and the conveying unit are combined. In this state, the manual feed mode for reading while moving the original document and the automatic paper feed mode for reading while separating the plurality of originals into one sheet with the reading unit, the transport unit and the paper feeding unit combined are switched. In each mode switched by the switching unit, the drive control of the drive unit is performed according to the document detection state of the sensor, so that it is possible to extend to various usage forms. Promoting miniaturization and cost reduction while maintaining, it is possible to obtain highly reliable image reading apparatus.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of an image reading apparatus of the present invention.

FIG. 2 is a side view of the image reading apparatus of FIG.

FIG. 3 is a side view showing a state in which the tray of the paper feeding unit in FIG. 1 is folded.

FIG. 4 is a cross-sectional view of a state in which a reading unit, a conveying unit, and a paper feeding unit are combined.

FIG. 5 is a side view showing a state in which the reading unit and the transport unit are combined.

FIG. 6 is a cross-sectional view showing an internal configuration in a state where a reading unit and a conveying unit are combined.

FIG. 7 is a side view showing the reading unit with the transport unit separated.

FIG. 8 is a cross-sectional view of the reading unit with the transport unit separated.

FIG. 9 is a front view of a reading unit.

FIG. 10 is a bottom view of the reading unit.

FIG. 11 is a cross-sectional view showing a configuration in which a carrying roller and the like of a reading unit are projected from a cover.

FIG. 12 is a plan view of a transport unit.

FIG. 13 is a front view of a transport unit.

FIG. 14 is a side view of the transport section.

FIG. 15 is a cross-sectional view showing a combined state of a transport unit and a reading unit.

FIG. 16 is a plan view of a paper feeding unit.

FIG. 17 is a side view of the paper feeding unit.

FIG. 18 is a cross-sectional view for explaining an operation in a state where the reading unit, the transport unit, and the paper feeding unit are combined.

FIG. 19 is a cross-sectional view for explaining an operation in a state where the reading unit, the transport unit, and the paper feeding unit are combined.

FIG. 20 is a cross-sectional view for explaining an operation in a state where the reading unit and the transport unit are combined.

FIG. 21 is a cross-sectional view showing a state in which a document image is read only by the reading unit.

FIG. 22 is a cross-sectional view for explaining a state where the document edge is reached when the document image is read only by the reading unit.

FIG. 23 is a cross-sectional view showing a configuration of a modified example of the reading unit.

[Explanation of symbols]

 1 Reading Section 2 Conveying Section 3 Paper Feeding Section 4 Tray 5A Conveying Roller 5B Conveying Roller 6 Image Sensor 10 Cover 11 Motor 15 Sensor 16 Spring 17 Frame 20A Roller 20B Roller 21 Holding Member 30 Feeding Roller 31 Separation Pad

Claims (6)

[Claims] 1. A reading unit for reading an image of an original document that moves relatively by rotation of a rotating body driven by a drive unit, a sensor attached to the reading unit for detecting the original document, and a detachable unit for the reading unit. A transport unit that freely contacts the rotating body to transport the document, and an image of the document while moving the reading unit by rotating the rotating unit driven by the driving unit and placing the reading unit on the document. Switching means for switching between a self-propelled mode for reading a document and a manual feed mode for reading a document while moving the document in a state where the reading section and the transport section are combined, and a document of the sensor in each mode switched by the switching section. An image reading apparatus comprising: a control unit that controls driving of the drive unit according to a detection state. 2. The control means drives the drive section in a state where the sensor detects a document in the self-propelled mode, stops the drive in a non-detection state, and detects the document in the manual feed mode. The image reading apparatus according to claim 1, wherein the driving unit is driven by a predetermined amount to move the document by a predetermined amount to start reading. 3. A reading unit for reading an image of an original document that moves relatively by rotation of a rotating body driven by a drive unit, a sensor attached to the reading unit for detecting the original document, and a detachable unit for the reading unit. It has a conveying member that freely conveys the original in contact with the rotating body, and is driven by the driving unit to separate a plurality of originals into one and supply it between the reading unit and the conveying member. A paper unit, a self-propelled mode in which the reading unit is placed on a document, and the image of the document is read while moving the reading unit by rotation of a rotating body driven by the driving unit, the reading unit and the feeding unit. Switching means for switching between an automatic paper feed mode for reading a plurality of originals while separating them into one sheet in a state where the paper unit is combined, and this switching means. Image reading apparatus characterized by comprising a control means for controlling the driving of the driving unit in accordance with the document detection state of the sensor in the mode. 4. The control means drives the drive unit in a state where the sensor detects a document in the self-propelled mode, stops the drive in a non-detection state, and causes the sensor to detect the document in the automatic paper feed mode. In the non-detection state, the drive unit is driven to feed out the document from the paper feed unit, and when the sensor detects the document, the drive unit is driven by a predetermined amount to move the document by a predetermined amount to start reading. The image reading device according to claim 3. 5. A reading unit for reading an image of a document that moves relatively by the rotation of a rotating body driven by a driving unit, a sensor attached to the reading unit for detecting the document, and a detachable unit for the reading unit. A transport unit that freely transports a document by contacting the rotating body, and a transport unit that is detachably attached to the reading unit and is driven by the drive unit to separate a plurality of documents into one document and the reading unit and the transport unit. A paper feeding unit for supplying the space, a self-propelled mode for reading the image of the document while moving the reading unit by rotating the rotating body driven by the driving unit by placing the reading unit on the document, A manual feed mode in which a document is read while moving the document in a state where the reading unit and the conveying unit are combined, and a case where a plurality of sheets are combined in the state where the reading unit, the conveying unit, and the sheet feeding unit are combined Switching means for switching between an automatic paper feed mode for reading the manuscript while separating it into one sheet, and control means for performing drive control of the drive section in accordance with the original detection state of the sensor in each mode switched by the switching means. An image reading apparatus comprising: 6. The control means drives the drive section in a state where the sensor detects a document in the self-propelled mode, stops the drive in a non-detection state, and detects the document in the manual feed mode. Then, the drive unit is driven by a predetermined amount to move the document by a predetermined amount to start reading, and in the automatic paper feed mode, the sensor drives the drive unit in a non-detection state of the document to send out the document from the paper feed unit, The image reading apparatus according to claim 5, wherein when the sensor detects a document, the drive unit is driven by a predetermined amount to move the document by a predetermined amount to start reading.