JP3969215B2 - Automatic paper feed type image reading device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic document feeding type image reading apparatus that is incorporated in a facsimile machine, a copying machine, etc., and automatically feeds a document to a reading unit.
[0002]
[Prior art]
In an automatic document feeding type image reading apparatus, a document set in the document feeding unit is set to prevent the document from being skewed and conveyed when the document is fed to the reading unit. A pair of document guides that regulate both edges in the document width direction (direction orthogonal to the paper feed direction) are provided so as to be movable in the document width direction. When one pair of the document guides is moved, the other is moved in the opposite direction by the same distance.
[0003]
[Problems to be solved by the invention]
Conventionally, however, since the document guide is configured to be manually adjusted to the document size by the user, there is a problem that a series of operations associated with document setting is troublesome. That is, for example, when reading an A4 size document, if the distance between document guides is smaller than the width of the A4 size before setting the document, the distance between the document guides should be slightly larger than the width of the A4 size. A document is set and a document guide is in contact with both edges of the document. If the distance between the document guides is considerably larger than the width of the A4 size before the document is set, the document guide is set after the interval between the document guides is slightly narrower than the A4 size, and the document guide is It is in contact with both edges.
[0004]
The present invention has been made paying attention to such problems, and an object of the present invention is to provide an automatic paper feed type image reading apparatus that saves the trouble of manually aligning the document guide with the edge of the document. .
[0005]
[Means for Solving the Problems]
  In order to achieve the above object, an automatic paper feed type image reading apparatus according to the present invention conveys a document set in a document feeding unit to a reading unit one by one, and A document guide provided so as to be movable in a direction orthogonal to the paper feed direction, a driving means for moving the document guide in the orthogonal direction, and contact between the document guide and the document set in the document feeder are detected. Detection means;Document size detection means for detecting the size of the document set in the document feeder,Controls the movement of the document guide based on the detection result by the detection means.At the same time, the moving speed pattern of the document guide is controlled based on the document size detected by the document size detecting means.And a control unit.
[0006]
  In this image reading apparatus, if a user sets a document in a document feeding unit,A moving speed pattern based on the document sizeSince the document guide automatically moves to a position where it comes into contact with the document, it is not necessary to manually move the document guide until it comes into contact with the document.Further, the document guide can be moved with an efficient speed pattern using the existing document size.
[0008]
  Move the document guideRegarding the speed pattern, specifically, the control unit moves the document guide at a high speed until it approaches a position corresponding to the document size detected by the document size detection unit, and moves the document guide at a low speed after approaching. As a result, the document guide can be moved in a short time.
[0009]
In the present invention, the detecting means is not limited as long as it can detect the contact between the document guide and the document set on the document feeder. For example, a contact sensor such as a piezoelectric element is provided on the inner surface of the document guide. The contact can be detected by a detection signal output when the document comes into contact with the contact sensor. Alternatively, the contact may be detected by increasing the load current of the driving means when the document guide contacts the document.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to embodiments.
[0011]
FIG. 1 shows a facsimile apparatus 1 incorporating an automatic paper feed type image reading apparatus. A reading unit 10 for reading a document by two types of methods (ADF method and FBS method), which will be described later, is provided above the facsimile apparatus 1, and a display unit 15 such as a liquid crystal panel, numeric keys, character keys, An operation unit 16 having various function keys and the like is provided.
[0012]
The reading unit 10 mainly includes a book platen cover 20 disposed on the right side of the main body of the facsimile machine 1 and a document guide mechanism 30 disposed on the left side. The book platen cover 20 is attached in a hinge shape with a position near the back of the main body of the facsimile apparatus 1 as a fulcrum, and is provided so as to be openable and closable so that a front portion opens with respect to the main body of the facsimile apparatus 1. . The book platen cover 20 has a document supply tray 21 on which a document before reading by the ADF system is placed above the document supply tray 21 and a document discharge tray 22 on which the document after reading is discharged below the document supply tray 21, respectively. I have.
[0013]
Further, the document supply tray 21 is provided with a pair of document guides 23 slidable in a direction perpendicular to the feeding direction of the document set on the tray 21. The pair of document guides 23 are interlocked so as to be always equidistant from the center line on the document supply tray 21, and move in opposite directions by the same distance.
[0014]
As will be described in detail later, the guide mechanism 30 takes in the sheet-like documents set in the center of the document supply tray 21 by the document guide 23 while separating them one by one, and discharges them to the document discharge tray 22 as described later. These document supply tray 21, guide mechanism 30, and document discharge tray 22 constitute an ADF (automatic document supply device).
[0015]
FIG. 2 is an enlarged perspective view of the book platen cover 20, and FIG. 3 is an enlarged plan view partially omitted. However, the shape is somewhat different from that shown in FIG. As described above, the upper part of the book platen cover 20 is the document supply tray 21 on which the document P to be conveyed is deposited and stored, and the document placed on the tray 21 is placed on the document supply tray 21. A pair of document guides 23 that are in contact with the document P and regulate the position of the document P in the width direction are provided on both sides of the width direction of P, that is, the direction orthogonal to the paper feeding direction (arrow direction). The document guide 23 is supported on the tray 21 so as to be slidable in a direction orthogonal to the paper feeding direction.
[0016]
A rack member 24 is integrally attached to each document guide 23, and the rack member 24 is disposed below the document supply tray 21. Further, in the document supply tray 21, long holes 25 are formed in the left-right direction (direction perpendicular to the paper feeding direction) corresponding to each document guide 23. The document guide 23 arranged on the tray 21 and the rack member 24 arranged below the tray 21 are connected through a long hole 25 by a connecting member 26.
[0017]
The long holes 25 are arranged in parallel to each other, and the rack members 24 are arranged in parallel to each other so that the respective tooth portions face each other. A pinion gear 28 attached to a rotating shaft of a motor (stepping motor) 27 as a driving means is rotatably supported at a substantially central portion of the pair of document guides 23 below the document supply tray 21. . The pinion gear 28 is disposed between the rack members 24 and meshes with the rack members 24. That is, the pair of rack members 24 mesh with the pinion gear 28 at positions facing each other. Accordingly, when the pinion gear 28 is rotated by the operation of the motor 27, the rack member 24 moves in the opposite direction, and the pair of document guides 23 approach each other along the long hole 25 according to the rotation direction of the pinion gear 28. To leave.
[0018]
FIG. 4 is a schematic longitudinal sectional view as seen from the front of the main body of the facsimile machine 1 in order to show the main configuration of the reading unit 10. The reading unit 10 includes translucent plates 31 and 32 having a width (in the depth direction in FIG. 4) that is equal to or larger than the width of a document that can be read. The translucent plate 31 is for reading a stationary original by the FBS method, and has a slightly longer length (left and right in FIG. 4) than the maximum size original that can be read. The translucent plate 32 is for reading a moving document by the ADF method, and is provided near the left end of the translucent plate 31 and has a length of about several tens of mm.
[0019]
Below the light-transmitting plates 31 and 32, a light source device 33 including a light source of light to be irradiated onto the document and a mirror that changes the optical path of reflected light orthogonal to the document surface in a direction parallel to the document surface. A plurality of reflection mirrors 35 that change the optical path of the reflected light from the mirror of the light source device 33 and enter the condenser lens 34, and pixels on the document by the reflected light from the reflection mirror condensed by the condenser lens 34. An image pickup device 36 that optically reads information is provided. The light source device 33, the reflection mirror 35, the condenser lens 34, and the imaging device 36 have a width (length in the depth direction in FIG. 4) that is slightly larger than the width of the light transmitting plates 31 and 32, respectively.
[0020]
The optical system composed of the light source device 33 and the reflecting mirror 35 is controlled to stop at some fixed positions and to move between them by an optical system drive control unit (not shown). However, in this case, the movement amount of the reflection mirror 35 is controlled to ½ of the movement amount of the light source device 33. As the fixed position of the light source device 33, for example, an ADF reading position A, which is a position immediately below the translucent plate 32 for moving documents, and an end portion of the FBS translucent plate 31 on the side far from the guide mechanism 30. The FBS system start position B (just below the upper side of the translucent plate 31) and the FBS system near the end (directly below the lower side of the translucent plate 31) near the guide mechanism 30 of the FBS system translucent plate 31. An end position C, a home position H for waiting in a state where the original is not read, and the like. The home position H is set at a position slightly closer to the position A side, that is, the guide mechanism 30 side than the start position B of the FBS system.
[0021]
Therefore, when the light source device 33 is at the position A as indicated by reference numeral 33 (A), the reflection mirror 35 is placed on the light source device 33 as indicated by reference numeral 35 (A). When the light source device 33 is at the position B as indicated by reference numeral 33 (B), the reflection mirror 35 is positioned at the position A as indicated by reference numeral 35 (B). When the light source device 33 is at the position H as shown by reference numeral 33 (H), the reflection mirror 35 is indicated by reference numeral 35 (H). As shown, the position is slightly moved to the position A side from the position indicated by reference numeral 35 (B). When the FBS method reading is performed, the light source device 33 reciprocates between a start position B near the right end of the FBS method translucent plate 31 and an end position C near the left end.
[0022]
A book platen cover 20 is provided so as to be openable and closable so as to cover the translucent plate 31 above the translucent plate 31 for the FBS system. As described above, the book platen cover 20 has a document supply tray 21 in which a sheet-shaped document before reading by the ADF method is set on an upper portion thereof, and a lower portion of the book supply tray 21 after reading by the ADF method. A document discharge tray 22 for discharging documents is provided. Further, the document exit (left end portion in FIG. 4) of the document supply tray 21 and the document entrance (left end portion in FIG. 4) of the document discharge tray 22 are arranged in parallel in the vertical direction, and are close to each other and of the ADF system. A guide mechanism 30 is provided at a position on the translucent plate 32.
[0023]
In FIG. 2, contact sensors SR are provided on the inner side surfaces of the pair of document guides 23 as detection means for detecting contact between the document guide 23 and the document set on the document supply tray 21. The contact sensor SR is composed of, for example, a piezoelectric element. When the contact sensor SR comes into contact with the edge of the document set on the document supply tray 21, the contact sensor SR detects the pressure and outputs a detection signal indicating that the document guide 23 has contacted the document. Note that the contact sensor SR does not need to be provided on both of the pair of document guides 23 and may be provided on only one side. The detection result by the contact sensor SR is sent to the CPU 51 described later.
[0024]
As will be described in the following operation, the document guide 23 moves inward by the operation of the motor 27 until it contacts the document, and stops when the contact sensor SR detects contact between the document guide 23 and the document. It has become.
[0025]
On the other hand, in FIG. 3, four sensors S1, sensor SA4, sensor SB4, and sensor SA3 are arranged in parallel in the positions shown in the figure as document size detection means in the vicinity of the document exit of the document supply tray 21. . Among these sensors, the sensor S1 is a sensor that is disposed at a position hidden by the original when the original is set on the original supply tray 21, and detects whether or not the original is set on the original supply tray 21. The sensors SA4, SB4, and SA3 are arranged at positions hidden by the A4, B4, and A3 size originals set on the original supply tray 21, respectively, and the A4, B4, and A3 size originals set on the original supply tray 21, respectively. This is a sensor for detecting the size (width).
[0026]
As will be described in detail below, when the user places a document on the document supply tray 21, if the document is A4 size, the sensors S1 and SA4 detect the presence of the document, and the document is B4 size. In some cases, sensor S1 and sensors SA4 and SB4 detect the presence of a document, and when the document is A3 size, all of sensor S1 and sensors SA4, SB4 and SA3 detect the presence of the document. If the document is smaller than the A4 size (for example, B5), only the sensor S1 detects the presence of the document. Document detection results by these sensors S1, SA4, SB4 and SA3 are sent to a CPU 51 which will be described later.
[0027]
In the guide mechanism 30, a separation roller 41 for separating the documents one by one is provided at a position close to the document exit of the document supply tray 21. A relatively large-diameter transfer roller 42 is disposed on the ADF translucent plate 32 in close contact therewith, and a plurality of driven rollers 43 are disposed so as to surround the transfer roller 42. Yes. A guide plate is provided from the separation roller 41 through the plurality of driven rollers 43 to the translucent plate 32, and further from the translucent plate 32 toward the document discharge tray 22, and from the separation roller 41 through the transfer roller 42. A guide plate is also provided in the direction of the document discharge tray 22, and as shown by the two-dot chain line with arrows, the document exits from the document supply tray 21 through the periphery of the separation roller 41 and the transfer roller 42. A document transfer path is formed up to a position close to the document inlet side of the discharge tray 22.
[0028]
Therefore, in the case of the ADF method, the document is set in a state where the end of the sheet-shaped document is pressed against the separation roller 41 and positioned at the center on the document supply tray 21 by the document guide 23. Then, the uppermost sheet of the document set on the document supply tray 21 is separated by the separation roller 41 and given a transfer force, and further, the transfer roller 42 and a plurality of driven rollers 43 move to the document entrance of the document discharge tray 22. It is transported towards. In the meantime, the document is transported at a constant speed while the surface (the surface on which the image to be read is formed) is pressed against the translucent plate 32, so that light is irradiated from the light source device 33 and optically transmitted. Original reading is performed.
[0029]
Reference numeral S2 is a sensor for detecting whether or not a document is set on the document supply tray 21 (the presence or absence of a document). The sensor S2 is disposed at the position of the separation roller 41 on the side of the document supply tray 21 because the leading edge of the document set on the document supply tray 21 is pressed against the separation roller 41. The result of document detection by the sensor S2 is sent to a CPU 51 described later.
[0030]
Reference numeral S3 is a sensor for detecting the size (width) of the document supplied into the guide mechanism 30 by the ADF method, and an appropriate part in the document transfer path from the separation roller 41 to the light transmitting plate 32. For example, they are arranged at positions corresponding to A3, B4, and A4 sizes, respectively.
[0031]
FIG. 5 is a block diagram showing a functional configuration example of the facsimile apparatus according to this embodiment. The automatic paper feed type image reading apparatus of the present invention can be incorporated not only as a facsimile apparatus but also into various apparatuses such as a multifunction machine having a facsimile communication function.
[0032]
The CPU 51 functioning as a control unit includes an operation unit including a display unit 15 (see FIG. 1) using, for example, an LCD (liquid crystal display device) via a bus 50, and numeric keys, character keys, various function keys, and the like. 16 (see FIG. 1), a ROM 52 storing a program for operating procedures of the facsimile apparatus, a RAM 53 functioning as a storage means for temporarily storing various data, and encoding / decoding of a binary image signal Is connected to a part that performs digital signal processing, such as a codec (CODEC) 54.
[0033]
Further, the CPU 51 binarizes the original reading unit 10 having the image pickup device 36 using the CCD (charge coupled device) as an image pickup device and the analog signal read by the image pickup device 36 through the bus 50 to obtain a digital image. An image processing circuit 55 for converting the signal into a signal and a portion for reading and printing an image, such as a printer 56 for printing a digital image signal on paper, are connected. Further, the CPU 51 is connected via a bus 50 to a motor driver 57 that controls the rotation direction and amount of rotation of the motor 27 as drive means for moving the pair of document guides 23. The CPU 51 is also connected via a bus 50 to a network control unit (NCU) 58 that connects this device to the communication line network 60 and a part that performs communication functions such as a modem 59.
[0034]
Note that the contact sensors SR, S1, SA4, SB4, SA3, S2, S3 are all connected to the reading unit 10 in the block diagram of FIG. 5, and these contact sensors SR, sensors S1, SA4, Detection signals from SB4, SA3, S2, and S3 are sent to the CPU 51 via the bus 50.
[0035]
Next, the movement operation of the document guide 23 in the facsimile apparatus 1 will be described with reference to the flowchart of FIG. However, before the document is set on the document supply tray 21 (standby state), the document guide 23 is returned to the position of the maximum width (a width slightly larger than A3).
[0036]
First, in step ST1, it is determined whether or not a document has been set on the document supply tray 21, that is, whether or not the sensor S1 and / or sensor S2 has detected a document. If this determination is NO, the document is set. Wait until When the document is set, in step ST2, the motor 27 is driven to move the document guide 23 inward. Next, in step ST3, it is determined whether the document guide 23 and the document are in contact with each other. That is, as described above, it is determined whether or not the contact sensor SR of the document guide 23 has output a signal for detecting the document. When the document guide 23 does not contact the document, the process returns to step ST2, and the document guide 23 is moved until the document guide 23 contacts the document.
[0037]
When the document guide 23 comes into contact with the document, the document guide 23 is stopped in step ST4. Then, in step ST5, the document is automatically fed one by one, the image of the document is read by the reading unit 10, and the image data is read. Capture. In step ST6, it is determined whether automatic document feeding and image reading of all the originals have been completed. If the originals still remain, the process returns to step ST5 and continues to take in the original image data. When the image reading of all the originals is completed, in step ST7, the motor 27 is driven to move the original guide 23 to the position of the maximum width, and again enters a standby state, and the process is ended.
[0038]
The movement operation of the document guide 23 is basic, but a more detailed operation example will be described with reference to the flowcharts of FIGS. In this flowchart, the movement speed pattern of the document guide 23 is controlled in accordance with the document size. The speed pattern is, for example, as shown in FIG.
[0039]
When the document size is larger than B4 and equal to or less than A3, the document guide 23 is moved from the beginning at a low speed S1 (first speed pattern shown in FIG. 9A). This is because it is not necessary to move the document guide 23 at a position slightly wider than A3 until the document guide 23 comes into contact with the document in a standby state for a document of a large size such as A3.
[0040]
When the document size is larger than A4 and less than or equal to B4, the document guide 23 is moved at a high speed S2 from A3 to B4, and at a low speed S1 after B4 (second speed pattern shown in FIG. 9B). . That is, when the document size is B4, for example, the document guide 23 is moved at a high speed until the document guide 23 approaches the document, and then moved at a low speed after approaching, so that the document guide 23 can be moved in a short time. It can be carried out.
[0041]
Similarly, when the document size is larger than B5 and A4 or less, the document guide 23 is high speed S2 from A3 to A4, and low speed S1 after A4 [third speed pattern shown in FIG. 9C]. Move with. Although not shown in FIG. 9, when the document size is B5 or less, the document guide 23 is moved at a high speed S2 from A3 to B5, and at a low speed S1 (fourth speed pattern) after B5. .
[0042]
Such first to fourth speed patterns are set in advance corresponding to a prescribed document size. Then, in step ST11 in FIG. 7, it is determined whether or not a document is set on the document supply tray 21, that is, whether or not the sensor S1 and / or sensor S2 has detected a document. Wait until is set. When the document is set, in step ST12, the size of the set document is detected by document size detection means (sensors S1, SA4, SB4, SA3). The document size is determined based on the detection results of the sensors S1, SA4, SB4, SA3. First, in step ST12, it is determined whether the width of the document is smaller than the A3 width and larger than the B4 width. When this determination is YES, that is, when all the sensors S1, SA4, SB4, and SA3 are ON, the document guide 23 in the first speed pattern (see FIG. 9A) as described above in step ST13. Move. Subsequently, in step ST14, it is determined whether the document guide 23 is in contact with the document. As described above, this determination is made based on, for example, whether or not the contact sensor SR of the document guide 23 has detected contact pressure due to document contact. When the document guide 23 does not contact the document, the document guide 23 is moved until it contacts, and when it comes into contact, the process proceeds to step ST23.
[0043]
If the determination in step ST12 is NO, it is next determined in step ST15 whether the width of the document is smaller than the B4 width and larger than the A4 width. When this determination is YES, that is, when the sensors S1, SA4, and SB4 are ON, the document guide 23 is moved in the second speed pattern (see FIG. 9B) in step ST16. Subsequently, in step ST17, it is determined whether the document guide 23 is in contact with the document. When the document guide 23 does not contact the document, the document guide 23 is moved until it contacts, and when it comes into contact, the process proceeds to step ST23.
[0044]
If the determination in step ST15 is NO, it is next determined in step ST18 whether the width of the document is smaller than the A4 width and larger than the B5 width. When this determination is YES, that is, when the sensors S1 and SA4 are ON, the document guide 23 is moved in a third speed pattern (see FIG. 9C) in step ST19 of FIG. Subsequently, in step ST20, it is determined whether the document guide 23 is in contact with the document. When the document guide 23 does not contact the document, the document guide 23 is moved until it contacts, and when it comes into contact, the process proceeds to step ST23.
[0045]
If the determination is NO in step ST18, that is, if only the sensor S1 is ON, the document guide 23 is moved at the fourth speed pattern in step ST21. Subsequently, in step ST22, it is determined whether the document guide 23 is in contact with the document. When the document guide 23 does not contact the document, the document guide 23 is moved until it contacts, and when it comes into contact, the process proceeds to step ST23.
[0046]
As described above, when the document guide 23 is moved in accordance with the first to fourth speed patterns in accordance with various document sizes and the document guide 23 comes into contact with the document, in step ST23, as in the flowchart of FIG. In step ST24, documents are automatically fed one by one, the image of the document is read by the reading unit 10, and the image data is captured. In step ST25, it is determined whether automatic paper feeding and image reading of all the originals have been completed. If the originals remain, the process returns to step ST24 to continue capturing the original image data. When the image reading of all the originals is completed, in step ST26, the motor 27 is driven to move the original guide 23 to the position of the maximum width, the standby state is set again, and the process ends.
[0047]
In the above embodiment, the pair of document guides 23 are moved in conjunction with each other, but instead, one of the pair of document guides 23 is fixed and only the other document guide is moved by the motor. It may be.
[0048]
In the above description, a stepping motor whose rotation amount corresponds to the command pulse number is used as the motor 27, and the document guide 23 always starts moving from the maximum width state. Therefore, without providing a detector (encoder) for detecting the absolute rotational position of the motor 27, the motor 27 can be controlled to rotate at a speed pattern that provides a predetermined speed according to the position of the document guide 23. . However, a detector for detecting the absolute rotation position of the motor 27 is provided, and the rotation speed of the motor 27 is controlled based on the detection signal, so that the document guide 23 is in a midway position other than the maximum width in the standby state. In other words, even when the document guide 23 starts to move from an intermediate position other than the maximum width, the speed can be controlled so as to have a predetermined speed according to the position.
[0049]
【The invention's effect】
  As described above, according to the automatic paper feed type image reading apparatus of the first aspect of the present invention, if the user sets a document on the document feed unit,A moving speed pattern based on the document sizeSince the document guide automatically moves to a position where it comes into contact with the document, it is not necessary to manually move the document guide until it comes into contact with the document.
[0050]
  Also, AlreadyUsing the existing document size, the document guide can be moved with an efficient speed pattern.
[0051]
  Further claims2With this configuration, the document guide can be moved in a short time.
[Brief description of the drawings]
FIG. 1 is a perspective view of a facsimile machine incorporating an automatic paper feed type image reading apparatus according to an embodiment.
FIG. 2 is an enlarged perspective view of a book platen cover in the facsimile apparatus.
3 is a partially omitted enlarged plan view of the book platen cover shown in FIG. 2. FIG.
FIG. 4 is a schematic longitudinal cross-sectional view seen from the front of the main body of the facsimile apparatus in order to show a main part configuration of a reading unit in the facsimile apparatus.
FIG. 5 is a block diagram illustrating a functional configuration example of the facsimile apparatus.
FIG. 6 is a flowchart showing the movement operation of the document guide in the facsimile apparatus.
FIG. 7 is a flowchart showing a more detailed operation example of a document guide moving operation in the facsimile apparatus.
FIG. 8 is a flowchart following the flowchart of FIG. 7;
FIG. 9 is a diagram showing first to third movement speed patterns of a document guide that is moved according to various document sizes in the same facsimile apparatus.
[Explanation of symbols]
1 Facsimile device
10 Reading unit
20 Book platen cover
21 Document supply tray
22 Document discharge tray
23 Document Guide
27 Motor (drive means)
51 CPU (control unit)
SR contact sensor (detection means)
S1, SA4 sensor (document size detection means)
SB4, SA3 sensor (document size detection means)
P manuscript

Claims (3)

An automatic paper feed type image reading apparatus that conveys a document set in a document feeding unit to a reading unit one by one,
A document guide provided in the document feeder so as to be movable in a direction perpendicular to the feeding direction;
Driving means for moving the document guide in the orthogonal direction;
Detecting means for detecting contact between the document guide and the document set on the document feeder;
Document size detection means for detecting the size of the document set in the document feeder,
And a controller that controls movement of the document guide based on a detection result by the detection unit and controls a movement speed pattern of the document guide based on the document size detected by the document size detection unit. Automatic paper feed type image reading device. The control unit moves the document guide at a high speed until it approaches a position corresponding to the document size detected by the document size detection means, and moves the document guide at a low speed after approaching. The automatic paper feeding type image reading apparatus described. The control unit moves the document guide until the detection unit detects contact between the document guide and the document, and stops the document guide when the detection unit detects contact between the document guide and the document. Item 3. The automatic sheet feeding type image reading apparatus according to Item 2.

Images