JP4876229B2 - Document reader - Google Patents

Description

  The present invention relates to a document reading apparatus having means for reading a document on which an image is described, and more specifically, separates and separates a plurality of documents stacked on a paper feed tray one by one. The present invention relates to a configuration of an original reading apparatus with an automatic original conveying apparatus that reads an image while conveying an original.

  2. Description of the Related Art Conventionally, in the above document reading apparatus with an automatic document feeder, a rake guide member between a transparent large-sized glass plate 100 and an end glass plate 101 as disclosed in FIGS. 102 is arranged. From a line CCD image sensor or a contact image sensor (CIS) that can move over the lower surface of the large glass plate 100 for reading the image while the document is stationary and the end glass plate 101 through which the conveyed document passes. Is provided on the upper surface side of the cover body 104 near one end of a cover-like cover body 104 (document pressing cover body) that covers the surface side of the large glass plate and the end glass plate. A paper feed tray unit 105, a paper discharge tray unit 106, a document conveyance path 107 formed in a U-turn shape in a side view therebetween, and a plurality of conveyance roller pairs 109a, 109b, 109c provided in the document conveyance path, When the cover 104 is closed so as to cover the glass plates 100 and 101, the document pressing member 110 is interposed via the end glass plate 101. Proximity so as to face the reading sensor 103. In this state, when a plurality of originals 111 are placed on the paper feed tray unit 105 and the original reading operation is performed, the originals 111 are separated and conveyed one by one by the separating unit 108, and the surface of the end glass plate 101. The original 111 is discharged to the paper discharge tray unit 106 after the image of the original 111 is read.

  Then, a known paper presence / absence detecting means in Patent Document 1 is provided in the document conveyance path 107. That is, a swingable actuator member 112 is disposed in a through hole 114 between the upper and lower path plates 107a and 107b in the document transport path 107 so that the tip end 112a protrudes, and the tip end 112a of the actuator member 112 is When contacting the original 111 being conveyed and placed on the surface of the original 111, the actuator member 112 rotates counterclockwise in FIGS. 7 and 8, and the base end 112 b of the light blocking sensor 113 is rotated. The leading edge of the document 111 is detected apart from the portion.

  Therefore, while the document 111 is in sliding contact with the front end portion 112 a of the actuator member 112, it is determined that there is a sheet (document) from the signal from the sensor 113. On the other hand, when the trailing edge of the document 111 passing through the document conveyance path 107 passes through the tip portion of the actuator member 112, the leading end portion 112 a side of the actuator member 112 is out of the pair of path plates in the document conveyance path 107. The actuator member 112 is rotated so as to fall (fit) into the through hole 114 of the lower path plate 107b, and the trailing edge of the document 111 is detected, and it is determined that there is no document (paper).

When the leading edge of the document 111 is detected by a signal from the sensor 113, the document conveyance path 107 until a predetermined time elapses from that point or until the leading edge of the document 111 reaches the reading line 103 a in the reading sensor 103. The number of rotations of the conveyance drive motor (not shown) is counted (after a certain amount of movement of the document), and the image reading operation by the reading sensor 103 is started. Similarly, the conveyance drive motor (see FIG. 5) until a predetermined time has elapsed after the trailing edge of the document 111 is detected by a signal from the sensor 113 or until the trailing edge of the document 111 reaches the reading line 103a. The number of rotations (not shown) is counted (after a certain amount of document movement), and the image reading operation for one document is terminated.
Japanese Patent Laid-Open No. 9-183531

  However, when the stiffness of the document 111 passing through the document transport path 107 is strong (when it is difficult to bend due to a thick paper thickness or the like), the document 111 is pressed against the end glass plate 101 by the document pressing member 110. Then, the rear end portion of the document 111 is held in a state of being biased to the upper side of the pair of path plates (see the solid line state in FIG. 8), so that the leading end 112a of the actuator member 112 is close to the upper path plate 107a. The actuator member 112 is rotated until the base end 112b of the actuator member 112 is largely separated from the portion of the light blocking sensor 113, and the rotation of the actuator member 112 until the base end 112b shields the portion of the light blocking sensor 113. The moving angle increases. On the other hand, when the stiffness of the document 111 is weak, the rear end portion of the document 111 pushed by the base end portion 112b of the actuator member 112 is a pair of path plates as shown by a two-dot chain line in FIG. Since it is biased so as to be in sliding contact with the lower path plate 117b, the rotation angle of the actuator member 112 until the base end portion 112b of the actuator member 112 shields the portion of the light blocking sensor 113 is small.

  As described above, when the rotation angle of the actuator member 112 until the base end portion 112b shields the portion of the light blocking sensor 113 varies depending on the waist strength of the passing document 111, the image corresponding to the one document is obtained. When the reading time varies and is extreme, there is a problem in that the image reading operation ends even though the trailing edge of the document 111 does not pass through the image reading line, resulting in an image reading failure. This problem also occurs due to an error in reading the leading edge of the document.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a document reading apparatus that solves the above-mentioned conventional problems and that can accurately detect the leading edge and the trailing edge of a conveyed document.

In order to solve the above problems, the document reading apparatus according to the first aspect of the present invention is provided with document conveying means for separating and conveying the documents one by one from the paper feed tray, and a reading glass plate for the image of the document. In an original reading apparatus having an image reading means for reading at a read position and an original conveyance path for conveying an original from the paper feed tray to the paper discharge tray through the reading position, the image is disposed on the surface side of the reading glass plate. A document pressing member is disposed at a position facing the reading unit, and the detection means for detecting the presence or absence of the document swings by contacting the document passing through the document transport path, and the document pressing member An actuator member disposed in the document conveyance path upstream of the position where the sheet is disposed, and a sensor for detecting the swing position of the actuator member. Regulating means for the orientation constant, the actuator member than is arranged in the transport upstream side Rutotomoni, a swingable about the shaft toward the upper surface of the document conveying path, the document conveying path The lower end portion of the restricting unit extends along the upper surface and is close to or abuts on the upper surface of the document conveying path, and the actuator member abuts the lower end of the restricting unit and the document conveying path on the document. through portion capable of passing the tip portions are provided so as to overlap vertically, the tip portion of the actuator member, the non-detection time does not detect the by Ri document to said sensing means and said regulating means and the two through-section in the document conveying path protrudes, said at detection has been detected by Ri document detecting means in which is retracted from said at least one through portion.

  According to a second aspect of the present invention, in the document reading device according to the first aspect, the restricting unit includes a contact portion for allowing the passing document to follow one path plate in the document transport path. It is what.

  According to a third aspect of the present invention, in the document reading device according to the second aspect, the restriction means further includes an urging means.

According to a fourth aspect of the present invention, in the original reading device according to the second or third aspect , the one path plate has an acute angle with respect to a facing portion between the reading glass plate and the original pressing member. It is arranged so as to approach the shape.

According to the first aspect of the present invention, a document pressing member is disposed on the front side of the reading glass plate at a position facing the image reading unit, and the detection unit that detects the presence or absence of the document is configured to detect the document conveyance path. An actuator member disposed in a document transport path on the upstream side of the position where the document pressing member is disposed, and a swing position of the actuator member. and a sensor for detecting a regulating means for stabilizing the passing position of the document, the actuator member than is arranged in the transport upstream side Rutotomoni, about an axis toward the upper surface of the document conveying path a swingable, said extending along the upper surface of the document transport path, and and a lower end portion of said regulating means is in contact near or against the upper surface of the document conveying path, the lower end portion of said regulating means The fine document conveying path, wherein the actuator through portion capable of passing through a tip that abuts on the document in the member is provided so as to overlap vertically, the tip end portion of the actuator member, detects by Ri document to said detecting means the non-detection time does not protrude into the two through portions of the regulating means and the document conveying path, from said at detection has been detected by Ri document detecting means in which is retracted from said at least one through portion, the document Regardless of the strength of the document, if the passing document is regulated (biased) by the regulating means so as to be close to the surface of one path plate in the document conveying path, the leading edge of the document by the sensing means The edge and trailing edge can be detected accurately and stably, and the image reading operation of the document is stabilized.
According to the first aspect of the present invention, the detection means includes an actuator member that swings when coming into contact with the document, and a sensor that detects the swing position of the actuator member. The conventional structure can be used (applied) as it is, and the cost for improvement can be greatly reduced.

  According to the second aspect of the present invention, the restricting means includes a contact portion for allowing the passing document to follow one path plate in the document transport path. Thus, the passing document can be regulated by the regulating means so as to be close to the surface of one of the path plates in the document conveying path, and the document passing by the regulating means can be prevented from being jammed.

  According to the third aspect of the present invention, since the restricting means further includes an urging means, it is possible to place the passing document along the path plate on the side against gravity. .

According to the invention described in claim 4, the one path plate is disposed so as to approach an acute angle with respect to the facing portion between the reading glass plate and the document pressing member, The present invention is indispensable for such a route.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings. FIG. 1 is a perspective view of a document reading apparatus of the present invention, FIG. 2 is a perspective view of a state in which a lid cover is opened, and FIG. FIG. 3B is a partially cutaway side sectional view showing a state in which the trailing edge of the document has passed through the detecting means and the restricting means, and FIG. FIG. 5 is a functional block diagram of a control mechanism, FIG. 6 is a side sectional view showing a second embodiment of the regulating means, and FIG. 7 is a side of an image reading apparatus of the prior art. FIG. 8 is a cross-sectional view, and FIG. 8 is an explanatory diagram showing an error in detecting the trailing edge of the document due to waist strength in the prior art.

  The embodiment of the present invention is an image reading apparatus mounted on a housing 2 (see a two-dot chain line portion in FIG. 1) of a multi-function device (composite device) having a facsimile function, a scanner function, a copying function, and a printer function. 1 is applied. That is, the image reading apparatus 1 reads a facsimile original to be transmitted to the other facsimile apparatus during the facsimile function and an image of the original to be copied during the copying function.

  As shown in FIGS. 2, 3 (a), 3 (b), and 4, a transparent large-sized still image reading glass plate 4 for reading a document is disposed on the upper surface of the main body case 3 of the image reading apparatus 1. The scooping guide member 11 and the passing image reading glass plate 12 are fixed in the horizontal state in that order.

  A lid-like cover body 7 is mounted on the rear edge of the upper surface of the main body case 3 via a hinge 6 so as to be pivotable up and down, and the automatic document feeder 5 is provided on one side of the upper surface of the lid-like cover body 7. It has been. The automatic document feeder 5 includes a paper feed tray unit 20, a U-shaped conveyance path 21 in which document conveyance means 22 such as a conveyance roller is arranged, and a document conveyed to the surface of the passing image reading glass plate 12. A document pressing member 13 that allows the P image to approach, and a sheet discharge tray portion 23 on which the document P after image reading is discharged and accumulated are provided (FIGS. 3A and 3B). reference).

  An image reading means 10 (for example, a line-type contact image sensor (CIS)) for executing the scanner function is shown in FIG. 2 on the lower surface side of the still image reading glass plate 4 and the passing image reading glass plate 12. 3A, the image reading means 10 is provided so as to be able to reciprocate along the Y-axis direction (the conveyance direction of the original P) in Fig. 3A. The image reading means 10 is configured to be able to read an image in a range longer than the maximum width dimension of the transportable document P. The image reading means 10 stops at the passing image reading position 12a. The image reading means 10 may be a line type CCD image pickup device.

  The document pressing member 13 includes a parallel lower surface plate 13a facing the surface (upper surface) of the passing image reading glass plate 12, and an inclined guide plate 13b extending toward a downwardly inclined portion in the conveyance path 21 described in detail later. This is an inverted mountain shape when viewed from the side, and is biased in a direction approaching the surface of the passing image reading glass plate 12 by a biasing means 14 such as a coil spring (see FIG. 4). The document pressing member 13 is arranged in parallel with the length direction (main scanning direction) of the detection surface (reading surface) of the image reading means 10 and substantially the same length (see FIG. 2). In the embodiment, the lower surface plate of the document pressing member 13 is a metal plate. However, the entire document pressing member 13 may be made of a synthetic resin material having a smooth surface with a small friction coefficient. When a metal plate is used as the document pressing member 13, it is preferable to stick a white film (with an adhesive) on the lower surface of the metal plate in order to prevent show-through when reading the document P.

  A document conveying means 22 to be described later is arranged on one side of the upper surface of the lid-like cover body 7, and the document P supplied from the paper feed tray section 20 is conveyed by the document conveying means 22, and an image of this document P is displayed. The image is read by the image reading means 10 that is temporarily stopped (stopped) on the lower surface side of the passage image reading position 12a of the passage image reading glass plate 12 and scooped up at the position of the scooping guide member 11, and then is discharged to the discharge tray portion 23. The paper is configured to be discharged.

  In the present embodiment, the large area portion of the still image reading glass plate 4 on the right side of the position of the scooping guide member 11 in FIGS. 2, 3 (a) and 3 (b) is on the glass plate 4. The flatbed reading unit reads an image of a document placed face down. For this reason, a pressing body 7a made of a sponge, a white plate, or the like is provided on the lower surface of the lid-like cover body 7 to hold the document with the surface on which the image is written on the still image reading glass plate 4 facing downward. As a result, the image reading means 10 moves along a guide rail (not shown) disposed on the lower surface of the still image reading glass plate 4 in accordance with an image reading command in a state where the document is pressed by the presser 7a. It is also a configuration that can read an image.

  The configuration of the paper feed tray unit 20 and the conveyance path 21 will be described. A case portion 31 of the automatic document feeder 5 is fixed to one side of the lid-like cover body 7, and at one end of the case portion 31, the paper feed tray portion 20 has its free end upward, and the case portion The document P is disposed so as to be at a low height so that the document P is stacked with the surface on which the image is written facing upward. On the other hand, a paper discharge tray portion 23 is formed on the upper surface of the lid-like cover body 7 below the paper feed tray portion 20 (see FIG. 1).

  A separation roller 25 and a separation friction plate 26 facing the separation roller 25 are provided on the lower end side (introduction portion to the conveyance path 21) of the sheet feed tray unit 20, and a plurality of documents stacked on the sheet feed tray unit 20. P is separated one by one and sent to the conveyance path 21. A conveyance path 21 capable of reading one side of the document P supplied from the sheet feed tray 20 at the passing image reading position 12a and discharging the document P is a conveyance roller pair 22a composed of a driving roller and a driven roller as document conveyance means 22. A plurality of 22b and 22c are arranged at appropriate intervals (see FIGS. 3A and 3B), and the drive rollers in these transport rollers 22a, 22b, and 22c are not shown in the drive system and drive motor 24 (see FIG. 5)).

  As shown in FIGS. 3A and 3B, the conveyance path 21 includes an inner path plate 21 a that is substantially U-shaped laterally in a side view and is provided outside the inner path plate 21 a. The outer path plate 21b is arranged on the radial side with a predetermined gap. The inner path plate 21 a is integrally formed in the case portion 31. The outer path plate 21 b is integrally formed on the inner surface side of the rotation cover body 32 that covers the upper side of the case portion 31.

  Note that the lower end (base end) of the rotation cover body 32 is connected to the side end portion of the case portion 31 so as to be vertically rotatable about the pivot portion 33. Therefore, by opening the rotation cover body 32, not only the document P jammed at the site of the conveyance path 21 but also the document P stopped at the position of the passing document reading glass plate 12 due to the paper jam can be removed. Be able to.

  As shown in FIGS. 3 (a), 3 (b), and 4, the outer path plate is arranged so as to approach the surface of the passing image reading glass plate 12 on the upstream side of conveyance at the position where the document pressing member 13 is disposed. 21b is formed and arranged in a downwardly inclined shape. The inner path plate 21a is formed so as to end at the upper part of the conveyance roller pair 22b closest to the upstream side of the arrangement position of the document pressing member 13. An actuator member 27 similar to that of the prior art is pivotally supported about the pin shaft 29 so as to be vertically rotatable between the upper driving roller 22b ′ of the conveying roller pair 22b and the document pressing member 13. ing. On the upstream side, a regulating body 30 as a regulating means of the present invention is provided so as to be able to swing up and down about the horizontal axis 33.

  The restricting body 30 is formed of a metal plate or a synthetic resin material in a substantially L shape in a side view, and a lower end portion 30a of the restricting body 30 extends downstream along the upper surface of the outer path plate 21b. The lower end 30a is close to or in contact with the upper surface of the outer path plate 21b by its own weight. The lower end 30a is divided into two forks, and a gap groove 34 penetrating vertically is provided between them (see FIG. 4). The through hole 35 formed in the terminal portion of the outer path plate 21b and the gap groove 34 are arranged at positions where they overlap each other.

  The actuator member 27 is substantially L-shaped when viewed from the side, and is formed so that the weight of the tip end portion 27a is larger than that of the rear side. In a state where the document P does not pass through the upper surface of the outer path plate 21b, the downward leading end portion 27a is set so as to pass through the gap groove 34 and the through hole 35.

  A non-contact sensor 36 such as a light blocking photo interrupter is fixed to the upper surface of the frame 36 that supports the upper end side of the biasing means 14 of the document pressing member 13, and an actuator member 27 that can be turned up and down. It arrange | positions so that the rear-end part 27b can descend | fall and can interrupt | block the detection part 36a.

  Next, the control means 40 for accurately detecting the leading edge and the trailing edge of the conveyed document P will be described with reference to the block diagram of FIG.

  Usually, the control means 40 mounted on the multi-function device includes the image reading means 10, the comparison means 42, the controller 41, the determination means 43, the detection means 44, the operation means 45, the display means 46, the storage means 47, and the communication means 48. And a printing unit 50 such as a printer unit. The controller 41 and the determination unit 43 are a CPU or the like. The storage means 47 is a semiconductor memory, a hard disk or the like, and temporarily stores various programs necessary for control, various data calculated through the CPU, image data read and received, and the like.

  The detecting means 44 is composed of an actuator member 27 and a sensor 36, and detects the leading edge or trailing edge of the document P and the length of the document of the document P up to the above-described trouble of the image reading position 12a. is there. The operation means 45 is a button key or the like provided on the operation panel section in the multi-function device, and the display means 46 is a liquid crystal panel or the like provided on the operation panel section. Further, the control unit 40 controls the driving motor 24 in the document conveying unit 22, and besides these, a communication unit 48 to which a telephone line or the like is connected, a printing unit 50 such as a printer function, and the like are also connected. The storage means 47 stores data for accurately detecting the start and end timing of image reading of the document P.

  That is, the leading edge of the document P conveyed against the leading end portion 27a of the actuator member 27 comes into contact, and the trailing end portion 27b of the actuator member 27 is disengaged from the detecting portion 36a of the sensor 36 to detect the optical signal. The distance between the leading edge of the original P and the image reading position 12a and the trailing edge of the conveyed original P are disengaged from the leading end 27a of the actuator member 27, so that the trailing end 27b of the actuator member 27 is This is data on the distance from the trailing edge of the document P to the image reading position 12a at the moment when the detection unit 36a of the sensor 36 is blocked.

  In the above configuration, when a document reading command is issued, the plurality of documents P stacked on the paper feed tray unit 20 are separated one by one from the uppermost side in order and sent to the document transport path 21. Since the leading edge of the document P that has passed between the outer path plate 21b and the inner path plate 21a hits the curved portion of the restricting body 30, and the lower end portion 30a is close to or in contact with the upper surface of the outer path plate 21b. Regardless of the strength of the waist, the document P is biased at the lower end 30a of the restricting body 30 so as to approach the upper surface of the outer path plate 21b. In this state, the leading edge of the document P pushes the leading end 27a of the swingable actuator member 27 protruding into the clearance groove 34 and the through hole 35, so that the actuator member 27 rotates counterclockwise as shown in FIG. Thus, it can be detected that the rear end portion 27b is disengaged from the detection portion 36a of the sensor 36, and the leading edge of the document P has come to a predetermined position.

  As a result, when the leading edge of the document P advances by a predetermined distance, it reaches the passing image reading position 12a of the image reading means 10, and the image reading operation for one document P is started therefrom.

  Similarly, the rear end portion of the document P is biased so as to be close to the upper surface of the outer path plate 21 b at the lower end portion 30 a of the restricting body 30, so that the rear end portion of the document P is the front end portion of the actuator member 27. When the actuator member 27 comes out of the position 27a, the actuator member 27 instantaneously rotates counterclockwise in FIG. 4, and the rear end portion 27b can block the detection portion 36a of the sensor 36. When the trailing edge advances, the image reading unit 10 reaches the passing image reading position 12a, and the image reading operation for one document P can be completed at that time.

  In this way, the regulating body 30 biases the original P so as to approach one path plate (in the embodiment, the outer path plate 21b) in the original transport path 21 regardless of the strength of the original P passing therethrough. Therefore, as described above, the rotation amount of the actuator member 27 when determining whether or not the document P is present is constant and stable. Accordingly, the timing for starting and ending the image reading of the document P is accurate.

  FIG. 6 shows a second embodiment of the restricting means, in which the base end portion of a flat plate 37 such as a PET film, which is strong (flexible elastic coefficient is large), is fixed to the end portion of the inner path plate 21a with an adhesive or the like. . The front end portion (free end portion) of the flat plate 37 extends in a direction approaching the front end portion 27a of the actuator member 27 (downstream side in the transport direction), and one path plate (in the embodiment, in the document transport path 21). The outer path plate 21b) is extended along the surface.

  As these modifications, the tip 27a of the actuator member 27 may extend toward the inner path plate 21a, and the original P may be biased so as to approach the surface of the inner path plate 21a by the restricting means. In any case, regardless of the strength of the document P, the passing document P is regulated (biased) by the regulating means so as to be close to the surface of one path plate in the document transport path 21. Accordingly, the leading edge and the trailing edge of the document P can be detected accurately and stably by the actuator member 27, and the image reading operation of the document P can be stabilized.

  The lower end portion 30a of the restricting body 30 and the tip end portion (free end portion) of the flat plate 37 correspond to a contact portion in claims. Further, the elasticity of the flat plate 37 itself, a torsion spring provided on the regulating body 30 to bring the lower end 30a close to the surface of one of the path plates, and the like correspond to the urging means in the claims.

  In addition, with respect to the facing portion between the passing image reading glass plate 12 and the document pressing member 13, one of the path plates is disposed so as to approach an acute angle, thereby restricting means (the restricting body 30, the flat plate 37). ) Does not exist, the trailing edge of the original P whose middle part is bent by the original pressing member 13 is affected in accordance with the strength of the lower side of the original P, so that one path plate or the other Therefore, the present invention is indispensable for such a path. Conversely, when there is almost no step between one path plate and the passage image reading glass plate 12, or when the path of the document P from the path plate to the surface of the passage image reading glass plate 12 is substantially the same plane, There is almost no necessity.

  In the present invention, there is an application to a detection means of a type provided with an actuator member 27 that abuts against a passing document P. Therefore, when an image reading apparatus provided with this type of detection means has been improved conventionally, a simple configuration is provided. Therefore, the manufacturing cost can be reduced.

1 is a perspective view of a document reading apparatus according to the present invention. It is a perspective view which shows the state which opened and rotated the cover body from the main body case. (A) is a partially cutaway side cross-sectional view of a document reading apparatus showing that a document is passing through a place of a restricting unit in the first embodiment of the present invention, and (b) is a document showing that the end edge of the document is a detecting unit and a restricting unit. It is a partially cutaway sectional side view which shows the state which passed the location. It is a principal part expanded sectional side view of 1st Embodiment. It is a functional block diagram of a control means. It is a sectional side view which shows 2nd Embodiment of a control means. It is a sectional side view of the image reading apparatus of a prior art. It is explanatory drawing which shows the error of the detection of the trailing edge of a document by the strength of a waist in a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image reading apparatus 3 Main body case 4 Still image reading glass plate 5 Automatic document conveying apparatus 7 Cover-like cover body 7a Press body 10 Image reading means 11 Slip guide member 12 Passing image reading glass plate 12a Passing image reading position 13 Original pressing member 13a Lower surface plate 13b Inclined guide plate 20 Paper feed tray section 21 Document transport path 22 Document transport means 23 Paper discharge tray section 27 Actuator member 30 Regulating body 36 Sensor 37 Flat plate 40 as regulating means Control means

Claims (4)

An original conveying means for separating and conveying originals one by one from the paper feed tray, an image reading means for reading an image of the original at a reading position provided with a reading glass plate, and an output from the paper feeding tray through the reading position. In a document reading apparatus having a document transport path for transporting a document to a paper tray, a document pressing member is disposed on the surface side of the reading glass plate at a position facing the image reading means,
The detecting means for detecting the presence / absence of the document swings by contacting the document passing through the document transport path, and is a document transport path on the upstream side of the position where the document pressing member is disposed. An actuator member disposed in the sensor, and a sensor for detecting a swing position of the actuator member,
Regulating means for maintaining a constant passage posture of the document, the actuator member than is arranged in the transport upstream side Rutotomoni, a swingable about the shaft toward the upper surface of the document conveying path, wherein Extending along the top surface of the document transport path, and the lower end of the regulating means is close to or in contact with the top surface of the document transport path;
In the lower end portion of the restricting means and the document conveyance path, a penetrating portion that can pass through a tip portion of the actuator member that contacts the document is provided so as to overlap vertically.
Tip of the actuator member, the sensing in the non-detection time that Ri does not detect the document by the means protrudes into the two through portions of the regulating means and the document conveying path, at the time of detection has been detected by Ri document to said sensing means A document reading apparatus, wherein the document reading apparatus is retracted from the at least one penetrating portion.   The document reading apparatus according to claim 1, wherein the restricting unit includes a contact portion for allowing the passing document to follow one path plate in the document transport path.   The document reading apparatus according to claim 2, wherein the restricting unit further includes an urging unit.   4. The one path plate is disposed so as to approach an acute angle with respect to a facing portion between the reading glass plate and the document pressing member. Document reading device.

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