JP6428348B2 - Reader - Google Patents

Description

  The present invention relates to a reader.

  2. Description of the Related Art Conventionally, a scanner that separates a plurality of documents placed on a document placement table one by one and transports them to a reading point, and optically reads the document at the reading point to generate image data representing a read image of the document. The device is known. There is also known a scanner device that can load originals of different sizes (see, for example, Patent Document 1). In this type of scanner device, the leading edge and the trailing edge of a document are detected by a sensor, and the reading start and end of the document are determined.

  As a document placement method, a document is placed such that the center of a direction orthogonal to the document transport direction of the document (hereinafter referred to as a horizontal direction) is aligned with a reference point at the center of the document placement table. A centering method (so-called center register method) is known.

JP 2009-118212 A

  According to the center alignment type scanner device, a sensor for detecting a document is usually arranged near the center in the lateral direction in the document conveyance path. However, with this arrangement, when documents of different sizes are mixedly loaded on the document table, there is a possibility that a document of a small size cannot be detected by the sensor.

  That is, when documents of different sizes are mixedly loaded by the center alignment method, the center of the document having the maximum width among the plurality of documents to be mixed is aligned with the reference point at the center of the document table. Then, the remaining documents are placed on the document placing table so as to be aligned on one side along the document conveyance direction of the document having the maximum width.

  When the size difference between the mixedly placed originals is large in such an original placing system, the original having a small size is arranged at a position deviated from the reference point of the original placing base and does not pass over the sensor. May be transported to the reading point. In this case, the sensor cannot detect the leading edge and the trailing edge of the small-size document, and the scanner device cannot control the reading timing of the small-size document based on the output of the sensor.

  Therefore, according to one aspect of the present invention, it is desirable to provide a reading apparatus capable of appropriately controlling the reading timing of a document even when a plurality of documents having a large size difference are mixedly loaded.

  A reading apparatus according to one aspect of the present invention includes a document placement table, a transport unit, a reading unit, a first sensor, a second sensor, and a control unit. A plurality of documents are placed on the document placement table. The plurality of originals are aligned on one side along the original conveying direction, and the center of the original having the maximum width in the direction orthogonal to the original conveying direction is the center of the original placing table in the direction orthogonal to the original conveying direction. It is placed so as to be aligned with a reference point in the central region.

  The transport unit is configured to separate and transport a document to be read from a plurality of documents placed on a document placing table. The reading unit is configured to read a document to be read conveyed by the conveyance unit at a reading point downstream of the document conveying direction from a separation point where the document to be read is separated.

  The first sensor is a point located between the separation point and the reading point in the document conveyance direction, and passes through this point at a point corresponding to the reference point in a direction orthogonal to the document conveyance direction. Arranged to detect the document.

  The second sensor is a point located between the separation point and the reading point in the document conveyance direction, and is a point where the document is detected by the first sensor in a direction orthogonal to the document conveyance direction. It is arranged so as to detect a document passing through this point at a point located on the side through which the aligned side of the plurality of documents passes from the detection point.

  The control unit is configured to control the transport unit and the reading unit. In the first case, the control unit detects the amount of the document to be read reaching the first detection point, and the first sensor detects the document to be read when the transport unit transports the document to be read. Based on the first distance, which is the distance from the first detection point to the reading point, and the document conveyance amount by the conveyance unit after the first sensor detects the leading edge of the document to be read, the reading unit reads the document. It is configured to control the start timing.

  In the second case where the first sensor does not detect the document to be read when the transport unit transports the document to be read, the control unit has an amount that the document to be read reaches the first detection point. Document transport by the transport unit after the second sensor detects the leading edge of the document to be read, and the second distance that is the distance from the second detection point to the reading point where the document is detected by the second sensor The reading start timing of the document by the reading unit is controlled based on the amount.

  According to the reading device of one aspect of the present invention, two sensors are provided in a direction orthogonal to the document conveyance direction, and the document is detected when the document is not detected by the first sensor disposed on the center side. The control unit controls the reading start timing based on the detection result by the second sensor arranged on the side of the point where the sides are aligned. Therefore, even when a plurality of documents having a large size difference are mixedly placed on the document placing table, it is possible to appropriately control the reading start timing of each document.

  Further, according to this reading apparatus, since the reading start timing of a large-size document can be controlled based on the detection result by the first sensor, the reading start timing can be accurately controlled while suppressing the influence of the document inclination. Can be controlled.

  In the first case, the control unit, based on the first distance, and the document conveyance amount by the conveyance unit after the first sensor detects the trailing edge of the document to be read, It may be configured to control the reading end timing. In the second case, the control unit, based on the second distance, and the document conveyance amount by the conveyance unit after the second sensor detects the trailing edge of the document to be read, It may be configured to control the reading end timing. According to this reading apparatus, even when a document having a large size difference is mixedly loaded on the document table, the reading start timing and the reading end timing of each document can be appropriately controlled.

  The reading device detects a document passing through this point at a point corresponding to the reference point in a direction downstream of the reading point in the document conveyance direction and perpendicular to the document conveyance direction. Three sensors may be provided.

  In the first case, the control unit controls the timing at which the new document is transported from the document placing table to the transport unit with reference to the time point when the third sensor detects the trailing edge of the document to be read. Can be configured. In the second case, the control unit controls the timing at which a new document is transported from the document placing table to the transport unit based on the time point when the second sensor detects the trailing edge of the document to be read. Can be configured. According to this configuration, the conveyance timing of the next original can be appropriately controlled.

  The reading device may be provided with a fourth sensor and a fifth sensor that detect a document upstream of the first detection point and the second detection point. The fourth sensor may be arranged so as to detect the document placed on the document placing table at a point corresponding to the reference point in a direction orthogonal to the document transport direction. The fifth sensor is a side on which a plurality of originals are arranged in a direction perpendicular to the original conveyance direction from the point where the original is detected by the fourth sensor. It can be arranged to detect at a point.

  In this case, when the transport unit starts transporting the document to be read in a large document placement state in which the document is detected by the fourth sensor and the fifth sensor, the control unit reads the document in the document transport direction. When the second sensor detects no document to be read when the transport unit transports the document to be read when the document reaches the second detection point, it is determined that a conveyance error has occurred. Can be configured.

  When the transport unit starts transporting the document to be read in a small document placement state in which the document is detected by the fourth sensor but not detected by the fifth sensor, the control unit If the second sensor detects a document when the document to be read reaches the second detection point in the transport direction, and the transport unit transports the document to be read, it is determined that a transport error has occurred. It may be configured as follows. According to this configuration, it is possible to appropriately determine the occurrence of conveyance abnormality related to a large document and a small document.

  The control unit is configured to determine that a conveyance abnormality has occurred when the second case occurs under the condition that documents having different widths in the direction orthogonal to the document conveyance direction are not mixed on the document table. May be. The fact that originals with different widths are not mixed can be specified by, for example, notification from the user. According to this configuration, it is possible to appropriately perform reading control and conveyance abnormality determination.

1 is a cross-sectional view illustrating a schematic configuration of an image reading apparatus. FIG. 3 is a schematic diagram illustrating a configuration around a document conveyance path together with sensor arrangement. FIG. 3A is a diagram illustrating a document placement mode when a single-size document is placed on the document tray, and FIG. 3B is a view of placing a document when a document of a different size is placed on the document tray. It is a figure showing an aspect. 1 is a schematic block diagram illustrating an electrical configuration of an image reading apparatus. It is a flowchart showing the mixed reading control process (the 1) which a main unit performs. It is a flowchart showing a mixed reading control process (the 2). It is a flowchart showing a mixed reading control process (the 3). It is a flowchart showing the 1st normal reading control processing by a main unit. It is a flowchart showing the 2nd normal reading control processing by a main unit.

Embodiments of the present invention will be described below with reference to the drawings.
An image reading apparatus 1 according to this embodiment shown in FIG. 1 is configured as an auto document feeder type scanner apparatus. The image reading apparatus 1 separates the originals Q to be read one by one from the group of originals Q placed on the original tray 10 and conveys them to a reading point by the line sensor 20, and uses the line sensor 20 at the reading point. The original Q is read, and the read original Q is discharged to the discharge tray 15. The image reading apparatus 1 executes the above processing in accordance with a reading command input from the external apparatus 3 (see FIG. 4), and provides the external apparatus 3 with image data representing a read image of the document Q.

  The image reading apparatus 1 includes a separation mechanism 30 and a transport mechanism 40 as a mechanism for transporting the document Q. The separation mechanism 30 is configured to include a separation roller 31 and a reverse roller 32 at the lower end of the document tray 10. The separation roller 31 rotates by receiving power from the first motor 51 through the transmission mechanism 52 (see FIG. 4). The separation roller 31 separates one lowermost document Q in contact with the separation roller 31 out of the documents Q placed on the document tray 10 by rotation, and conveys this downstream.

  The reverse roller 32 is provided to face the separation roller 31, and is rotated by the separation roller 31 when the separation roller 31 conveys the document Q downstream. The reverse roller 32 receives power from the second motor 55 through the transmission mechanism 56 (see FIG. 4) and rotates the document Q in a direction to retract the document Q when it is necessary to move the document Q backward. At this time, the separation roller 31 is driven to rotate by the reverse roller 32.

  The transport mechanism 40 disposed downstream of the separation mechanism 30 includes a roller pair including a transport roller 41 and a driven roller 42, and a roller pair including a paper discharge roller 45 and a driven roller 46. These roller pairs are provided on the conveyance path of the original Q, and convey the original Q from the upstream to the downstream by rotation. The transport roller 41 and the paper discharge roller 45 are rotated by receiving power from the second motor 55 through the transmission mechanism 56 when transporting the document Q downstream. A document Q conveyed from the document tray 10 is discharged to a discharge tray 15 located downstream of the discharge roller 45.

  The image reading apparatus 1 according to the present exemplary embodiment includes two opposing line sensors 20 between the conveyance roller 41 and the paper discharge roller 45 and is configured to be able to read both sides of the document Q. These line sensors 20 are configured as CIS image sensors, for example.

  A plurality of sensors FA, FB, RA, RB, RC capable of detecting the document Q are provided on the transport path of the document Q between the document tray 10 and the discharge tray 15. Specifically, the image reading apparatus 1 includes sensors FA and FB that can detect the original Q placed on the original tray 10 at a point where the original Q to be read is separated from the original tray 10 by the rotation of the separation roller 31. Is provided. Hereinafter, these sensors FA and FB are expressed as front sensors. In particular, the front sensor FA (see FIG. 2) provided in the vicinity of the document tray 10 and the center line L0 of the subsequent document transport path is expressed as a first front sensor FA and is a sub-line far from the center line L0. The front sensor FB provided on L1 is expressed as a second front sensor FB. The sensors RA, RB, RC located downstream of the first and second front sensors FA, FB in the document transport direction are expressed as rear sensors RA, RB, RC.

  As shown in FIG. 2, the rear sensor RA is provided on the sub line L1 at a point downstream in the document transport direction from the point where the second front sensor FB is located and upstream from the transport roller 41 in the document transport direction. A document Q passing through the point is detected. Hereinafter, this rear sensor RA is particularly expressed as a first rear sensor RA.

  The rear sensor RB is provided in the vicinity of the center line L0 at a position downstream of the transport roller 41 in the document transport direction and upstream of a position where the line sensor 20 reads the document Q, and detects the document Q passing through this point. . Hereinafter, this rear sensor RB is particularly expressed as a second rear sensor RB.

  The rear sensor RC is provided at a point corresponding to the paper discharge roller 45 in the vicinity of the center line L0, and detects the document Q passing through this point. Hereinafter, this rear sensor RC is particularly expressed as a third rear sensor RC. The third rear sensor RC may be arranged so as to detect the document Q that has passed through the paper discharge roller 45 downstream from the paper discharge roller 45, or passes through the paper discharge roller 45 upstream from the paper discharge roller 45. It may be arranged to detect the previous document Q.

  Here, the correspondence relationship between the placement mode of the original Q on the original tray 10 and the arrangement of the sensors FA, FB, RA, RB, and RC will be described. The document tray 10 of the present embodiment is configured as a document tray of a center alignment (center register) system. That is, the document tray 10 allows the user to place a plurality of documents Q of the same size on the document tray 10 with the center of the document Q aligned on the center line L0 as shown in FIG. 3A. Is configured.

  For example, a pair of guide bars that sandwich the left and right ends of the document Q are provided on the document tray 10 so as to be movable along the document transport direction in a direction perpendicular to the document transport direction, as in a known scanner device. For example, in response to a manual operation from the user, the pair of guide bars moves in a symmetrical manner with respect to the center line L0 of the document tray 10, and has an interval corresponding to the horizontal width of the document Q to be placed. It is configured to be placed in an open position. With this configuration, the user places the document Q on the document tray 10 by placing the document Q between the pair of guide bars so that the center of the document Q is aligned with the center line L0. be able to. In this specification, the width in the direction orthogonal to the document conveyance direction is also expressed as a horizontal width, and the direction orthogonal to the document conveyance direction is also expressed as a horizontal direction.

  In addition, in the image reading apparatus 1 of the present embodiment, when a plurality of documents Q having different widths are placed on the document tray 10 as a method for placing the documents Q, as shown in FIG. It is determined that one side of the original Q along the direction is aligned and the original Q is placed in the central area of the original tray 10. The broken line shown in FIG. 3B represents the outline of the small document Qs that is hidden behind the uppermost document Q. In the present embodiment, when a plurality of originals Q of different sizes are placed on the original tray 10, one side of the original Q is aligned on the left region side of the center line L0, and the center of the original with the maximum width is the center line. It is stipulated as a proper placement method that the plurality of documents Q be placed in the central area of the document tray 10 so as to be placed on L0. The left area referred to here is an area located on the left side of the center line L0 when the document tray 10 is viewed from the front.

  For this reason, in the present embodiment, the second front sensor FB and the first rear sensor RA are arranged along the sub-line L1 (see FIG. 2) that is set to the left side from the center line L0. The second front sensor FB and the first rear sensor RA are provided at positions where a small document Qs can be detected when a plurality of documents Q of different sizes are placed on the document tray 10 as shown in FIG. 3B.

  As shown in the upper area of FIG. 2, when a plurality of originals Q of different sizes are mixedly loaded, a small original Qs such as a business card size is conveyed to the discharge tray 15 without passing through the sensors FA, RB, RC. Therefore, when the second front sensor FB and the first rear sensor RA are not present, the position of the small document Qs must be estimated only by the rotation amount of the roller or the motor.

  On the other hand, when the sensors FB and RA are arranged on the sub-line L1 through which the originals Q of all sizes expected to be used pass and the sensors FA, RB and RC are not arranged on the center line L0 side, the sensors FB, Since the output of RA is greatly affected by the inclination of the original Q, it is difficult to accurately grasp the position of the original Q on the center line L0 for a large original.

  For this reason, in this embodiment, a second front sensor FB and a first rear sensor RA are provided separately from the sensors FA, RB, RC on the center line L0. When the maximum document size that can be used in the image reading apparatus 1 is A4 size (width 210 mm) and the minimum document size that can be used is business card size (width 91 mm), it is approximately 65-70 mm from the center line L0. It is conceivable that the sub line L1 is set at a certain position (position of about 40-35 mm from the end of the A4 document), and the second front sensor FB and the first rear sensor RA are arranged on the sub line L1. It is done.

  The image reading apparatus 1 of the present embodiment includes the sensors FA, FB, RA, RB, and RC arranged in this manner, and also provides power from the first motor 51 to the separation roller 31 as shown in FIG. And a transmission mechanism 56 that transmits power from the second motor 55 to the reverse roller 32, the conveyance roller 41, and the paper discharge roller 45. When the first motor 51 rotates forward, the transmission mechanism 52 transmits power to the separation roller 31 to rotate the separation roller 31 in the forward rotation direction in which the document Q is conveyed downstream.

  When the second motor 55 rotates in the forward direction, the transmission mechanism 56 transmits power to the transport roller 41 and the discharge roller 45 so that the document Q is transported downstream through the transport roller 41 and the discharge roller 45. When the second motor 55 rotates in the reverse direction, power is transmitted to the reverse roller 32 to rotate the reverse roller 32 in a direction in which the document Q moves backward.

  In addition, the image reading apparatus 1 includes a main unit 60, a reading control unit 70, a motor control unit 80, an AD converter 90, a user interface 95, and a communication interface 99.

  The main unit 60 performs overall control of the entire image reading apparatus 1. The main unit 60 includes a CPU 61, a ROM 63, a RAM 65, and an NVRAM 67. The CPU 61 executes a process according to a program stored in the ROM 63. The RAM 65 is used as a work area when the CPU 61 executes processes. The NVRAM 67 is an electrically rewritable nonvolatile memory and stores various data. The main unit 60 performs overall control of the image reading apparatus 1 by executing various processes in the CPU 61.

  The main unit 60 communicates with the external device 3 via the communication interface 99, for example. When the reading command is received from the external device 3, the reading control unit 70 and the motor control unit 80 are controlled so that the reading operation of the document Q based on the reading command is realized. Thereafter, the main unit 60 operates to provide image data representing a read image of the document Q generated by the reading operation of the document Q to the external device 3 via the communication interface 99. The external device 3 is a personal computer, for example, and is operated by a user to input a reading command to the image reading device 1.

  Based on a command from the main unit 60, the reading control unit 70 performs drive control of the line sensor 20 so that the line sensor 20 performs a reading operation in accordance with the conveying operation of the document Q. The reading control unit 70 sequentially inputs line data that is read image data for each line generated by the reading operation of the line sensor 20 to the main unit 60. The main unit 60 combines the line data to generate the image data representing the read image of the document Q, and provides this to the external device 3.

  The motor control unit 80 realizes transport control of the document Q from the document tray 10 to the discharge tray 15 by performing drive control of the first motor 51 and the second motor 55 based on a command from the main unit 60. The first motor 51 and the second motor 55 are composed of, for example, stepping motors. In this case, the motor control unit 80 can control the conveyance amount of the document Q by controlling the rotation amounts of the first motor 51 and the second motor 55.

  The AD converter 90 is configured to convert input signals from the sensors FA, FB, RA, RB, and RC into digital signals and input the digital signals to the main unit 60. The user interface 95 includes a display unit that displays various types of information to the user and a sound output unit that outputs various types of warning sounds.

  Next, details of the mixed reading control process executed by the main unit 60 will be described with reference to FIG. When a reading command in the mixed loading mode is input as a reading command from the external device 3, the main unit 60 executes the mixed reading control process shown in FIG. The reading command includes a reading command in the mixed loading mode and a reading command in the normal mode. The reading command in the mixed loading mode is external when a plurality of documents Q of different sizes are mixedly loaded on the document tray 10. Input from the user through the device 3. The reading command in the normal mode is input from the user through the external device 3 when the single-size original Q is placed on the original tray 10.

  When starting the mixed reading control process, the main unit 60 causes the motor control unit 80 to start driving the first motor 51, thereby starting the rotation of the separation roller 31 in the normal rotation direction (S110). Thereby, the separation roller 31 operates to separate the document Q to be read from the document tray 10 and convey it downstream.

  Thereafter, the main unit 60 determines whether or not the separation roller 31 has rotated a predetermined amount (S120). The predetermined amount of rotation is necessary for the separation roller 31 to separate one original Q to be read from the original tray 10 and convey it to the nipping point of the original Q between the conveying roller 41 and the driven roller 42. Determined in quantity. The main unit 60 can make the above determination based on the information on the rotation amount of the first motor 51 by the motor control unit 80.

  If it is determined that the separation roller 31 has not rotated by a predetermined amount (No in S120), the main unit 60 determines whether or not the input signal from the first rear sensor RA has been switched from the off signal to the on signal (S130). The sensors FA, FB, RA, RB, and RC are all turned off when the document Q is detected at the installation point and an ON signal is input to the main unit 60 and the document Q is not detected. It operates to input a signal to the main unit 60. If the main unit 60 determines that the input signal from the first rear sensor RA has not been switched to the ON signal (No in S130), the main unit 60 proceeds to processing S120.

  In this way, the main unit 60 stands by until the separation roller 31 rotates a predetermined amount or the first rear sensor RA is switched to the ON signal. If the separation roller 31 rotates by a predetermined amount while the first rear sensor RA remains off (Yes in S120), the main unit 60 determines that a conveyance error of the document Q has occurred and displays an error screen. The user interface 95 is controlled (S140).

  In step S140, the main unit 60 can display an error screen indicating that a jam has occurred along with detailed information such as a jam occurrence area on the user interface 95. In addition, a warning sound that informs the user interface 95 of the occurrence of a conveyance abnormality can be output. The main unit 60 may be configured to notify the external device 3 of the occurrence of an error through the communication interface 99.

  Specifically, the main unit 60 can cause the user interface 95 to display an error screen indicating that a jam has occurred in the document conveyance path from the document tray 10 to the conveyance roller 41 as information indicating a jam occurrence region. (S140). When the occurrence of the conveyance abnormality is notified to the user in this manner, the main unit 60 ends the process based on the reading command by ending the mixed reading control process.

  On the other hand, if it is determined that the input signal from the first rear sensor RA is switched to the ON signal (Yes in S130), the main unit 60 causes the motor control unit 80 to transmit the first motor 51 until the separation roller 31 rotates by the predetermined amount. The motor control unit 80 is controlled so as to stop the rotation of the separation roller 31 when the driving is continued and the separation roller 31 rotates by the predetermined amount (S150).

  Thereafter, the main unit 60 causes the motor control unit 80 to start driving the second motor 55, thereby starting the rotation of the transport roller 41 and the paper discharge roller 45 in the forward rotation direction (S160). Thereby, the transport mechanism 40 operates to transport the document Q transported by the separation roller 31 downstream. The main unit 60 operates to temporarily store the rotation start time T1 of the transport roller 41 in the RAM 65 (S160).

  When the transport mechanism 40 starts the transport operation of the document Q, the main unit 60 next switches the input signal from the second rear sensor RB from the off signal to the on signal, or the input signal from the second rear sensor RB is the off signal. The process waits until a predetermined first time elapses from time T1 (S170, S180). Then, when the input signal from the second rear sensor RB is switched to the on signal, the process proceeds to process S200, and when the first time elapses while the second rear sensor RB remains the off signal, the process proceeds to process S400. The first time is set to a time longer than the time required for the document Q to reach the installation point of the second rear sensor RB in the document transport direction by the rotation of the transport roller 41.

  After shifting to the process S200, the main unit 60 stores in the RAM 65 the time T2 when the second rear sensor RB is switched to the ON signal. Further, the main unit 60 is based on the rotational position Pon2 of the second motor 55 at the time when the second rear sensor RB is switched to the ON signal, at the rotational position of the second motor 55 when the line sensor 20 starts the reading operation. A certain reading start position Ps is determined (S210).

  When the rotation amount of the second motor 55 necessary for conveying the leading edge of the document Q from the detection point of the document Q by the second rear sensor RB to the reading point by the line sensor 20 is δP2, The reading start position Ps can be set to Ps = Pon2 + δP2-α, for example. The value α is a margin and is set to a value larger than zero. However, the value α may be set to zero. When a value greater than zero is determined as the value α, the reading start position Ps corresponds to the rotational position of the second motor 55 when the leading edge of the document Q is located slightly upstream from the reading point.

  When the reading start position Ps is determined, the main unit 60 starts the reading operation by the line sensor 20 under the control of the reading control unit 70 when the rotational position P of the second motor 55 reaches the reading start position Ps. Thus, a command is input to the reading control unit 70 (S220).

  Thereafter, as shown in FIG. 6, the main unit 60 switches the third rear sensor RC to the ON signal or the predetermined second time elapses from the time T2 while the input signal from the third rear sensor RC remains the OFF signal. (S230, S240). Then, when the second time has passed with the input signal from the third rear sensor RC being an OFF signal (Yes in S240), the main unit 60 determines that a conveyance error of the document Q has occurred and displays an error screen. Next, the user interface 95 is controlled (S250). In the process S250, the same process as the process S140 can be executed. Thereafter, the main unit 60 ends the mixed reading control process.

  If the third rear sensor RC is switched to the on signal before the second time has elapsed from the time T2 (Yes in S230), the main unit 60 stores the time T3 when the input signal from the third rear sensor RC is switched to the on signal. (S260).

  Thereafter, the main unit 60 waits until the input signal from the second rear sensor RB is switched to the OFF signal or until a predetermined third time elapses from the time T2 while the second rear sensor RB remains the ON signal (S270, S280). The third time is the time required for the original Q to pass through the second rear sensor RB from the leading edge to the trailing edge if the original Q being conveyed is a maximum-size original that can be used by the image reading apparatus 1. Determined for a longer time.

  Then, when the third time has passed with the input signal from the second rear sensor RB being an ON signal (Yes in S280), the main unit 60 determines that a conveyance error of the document Q has occurred and displays an error screen. Next, the user interface 95 is controlled (S290). In the process S290, the same processes as those in the processes S140 and S250 can be executed. Thereafter, the main unit 60 ends the mixed reading control process.

  When the input signal from the second rear sensor RB switches to the off signal before the third time has elapsed from time T3 (Yes in S270), the main unit 60 switches the input signal from the second rear sensor RB to the off signal. Based on the rotation position Poff2 of the second motor 55 at the time, the reading end position Pe, which is the rotation position of the second motor 55 when the reading operation by the line sensor 20 is ended, is determined (S300).

  Here, the reading end position Pe can be set to Pe = Poff2 + δP2 + β. As described above, the value δP2 is used to convey the leading edge (the trailing edge in this case) of the document Q of the second rear sensor RB from the detection point of the document Q by the second rear sensor RB to the reading point by the line sensor 20. This is the necessary amount of rotation of the second motor 55. The value β is a margin and is set to a value larger than zero. However, the value β may be set to zero. When a value greater than zero is determined as the value β, the reading end position Pe is determined as the rotational position of the second motor 55 when the trailing edge of the document Q is positioned slightly downstream from the reading point.

  After determining the reading end position Pe, the main unit 60 instructs the reading control unit 70 to end the reading operation by the line sensor 20 when the rotational position P of the second motor 55 reaches the reading end position Pe. Command input (S310).

  Thereafter, the main unit 60 waits until the input signal from the third rear sensor RC is switched to the off signal or the input signal from the third rear sensor RC is the on signal until the third time elapses from time T3 (S320). , S330). When the third time elapses with the input signal from the third rear sensor RC being an on signal (Yes in S330), the main unit 60 determines that a conveyance error of the document Q has occurred, and displays an error screen. The user interface 95 is controlled (S340). Thereafter, the main unit 60 ends the mixed reading control process.

  In addition, when the input signal from the third rear sensor RC is switched to the off signal before the third time has elapsed from time T3 (Yes in S320), the main unit 60 indicates that the input signal from the third rear sensor RC is the off signal. The time T4 switched to is stored in the RAM 65 (S350).

  Further, the main unit 60 determines the next document conveyance timing, which is the timing for separating and conveying the next document Q from the document tray 10 based on the time T4 when the third rear sensor is turned off (S360). Here, the next original Q can be normally conveyed without interfering with the preceding original Q, and the earliest timing can be determined as the next original conveyance timing. The next document conveyance timing can be determined by, for example, the elapsed time from time T4.

  Thereafter, the main unit 60 controls the motor control unit 80 so that the driving of the conveying roller 41 and the discharge roller 45 by the second motor 55 is stopped when the discharge of the document Q to the discharge tray 15 is completed. (S370). Completion of the discharge of the document Q to the discharge tray 15 can be determined based on, for example, the rotation amount or elapsed time of the second motor 55 from the time when the third rear sensor is switched to the off signal.

  When the main unit 60 does not receive an ON signal from either the first front sensor FA or the second front sensor FB after the driving is stopped (No in S380), the next original Q is placed on the original tray 10. The mixed reading control process is terminated by regarding that it is not placed. On the other hand, when an ON signal is input from at least one of the first front sensor FA and the second front sensor FB (Yes in S380), the main unit 60 proceeds to the process S110 and determines the next determined in the process S360. At the document conveyance timing, the motor control unit 80 is controlled so as to rotate the separation roller 31 in the normal direction, and the separation roller 31 starts the separation and conveyance operation of the next document Q.

  Here, it has been described that the conveyance of the next original Q is started after the driving of the second motor 55 is stopped (S360), but the next original conveyance timing is a timing before the driving of the second motor 55 is stopped. First, the same process as the process S110 can be executed in advance to rotate the separation roller 31 forward. That is, the main unit 60 starts the rotation of the separation roller 31 for conveying the next original Q, and then executes the drive stop process (S370) of the second motor 55, and executes the processes after the process S110. It may be configured to.

  Subsequently, processing after processing S400 (see FIG. 5) will be described. The processes after the process S400 are normally executed when the small document Qs is conveyed among the documents Q mixedly loaded on the document tray 10. When the process proceeds to step S400, the main unit 60 causes the line motor 20 to start a reading operation based on the rotational position Pon1 of the second motor 55 at the time when the first rear sensor RA is switched to the ON signal. The reading start position Ps that is the rotational position of is determined. For this reason, the main unit 60 can store the rotational position Pon1 of the second motor 55 at that time in the RAM 65 when the first rear sensor RA is switched to the ON signal.

  When the rotation amount of the second motor 55 necessary for conveying the leading edge of the document Q from the detection point of the document Q by the first rear sensor RA to the reading point by the line sensor 20 is δP1, The reading start position Ps can be set to Ps = Pon1 + δP1-α, for example. The value α can be determined as described above.

  When the reading start position Ps is determined, the main unit 60 starts the reading operation by the line sensor 20 under the control of the reading control unit 70 when the rotational position P of the second motor 55 reaches the reading start position Ps. Thus, a command is input to the reading control unit 70 (S410).

  After that, as shown in FIG. 7, the main unit 60 waits until the first rear sensor RA is switched to the off signal or the input signal from the first rear sensor RA remains the on signal until the third time elapses from the time T1. (S420, S430). Then, when the third time has passed with the input signal from the first rear sensor RA being an ON signal (Yes in S430), the main unit 60 determines that a conveyance error of the document Q has occurred and displays an error screen. Next, the user interface 95 is controlled (S440). In the process S440, the same process as the process S140 can be executed. Thereafter, the main unit 60 ends the mixed reading control process.

  In addition, when the first rear sensor RA is switched to the off signal before the third time has elapsed from the time T1, the main unit 60 is time when the input signal from the first rear sensor RA is switched to the off signal. T5 is stored in the RAM 65 (S450). The main unit 60 further includes the second motor 55 when the reading operation by the line sensor 20 is terminated based on the rotational position Poff1 of the second motor 55 at the time when the input signal from the first rear sensor RA is switched to the OFF signal. The reading end position Pe, which is the rotational position, is determined (S460).

  Here, the reading end position Pe can be set to Pe = Poff1 + δP1 + β. As described above, the value δP1 is necessary for conveying the leading edge (the trailing edge in this case) of the document Q of the first rear sensor RA from the detection point of the document Q by the first rear sensor RA to the reading point by the line sensor 20. This is the rotation amount of the second motor 55. The value β can be determined as described above.

  Further, the main unit 60 determines the next document conveyance timing, which is the timing for separating and conveying the next document Q from the document tray 10 based on the time T5 when the first rear sensor is turned off (S470). Here, as in step S360, the earliest timing among the timings at which the next document Q can be normally transported without interfering with the preceding document Q can be determined as the next document transport timing.

  Thereafter, the main unit 60 controls the reading control unit 70 so that the reading operation by the line sensor 20 is completed when the rotational position P of the second motor 55 reaches the reading end position Pe (S480). Further, the main unit 60 controls the motor control unit 80 so that the driving of the conveying roller 41 and the discharge roller 45 by the second motor 55 is stopped when the discharge of the document Q to the discharge tray 15 is completed. (S490). The completion of the discharge of the document Q to the discharge tray 15 can be determined based on the rotation amount of the second motor 55 from the reading end position Pe.

  When the main unit 60 does not receive an ON signal from either the first front sensor FA or the second front sensor FB after the driving is stopped (No in S500), the next original Q is placed on the original tray 10. The mixed reading control process is terminated by regarding that it is not placed. On the other hand, when an ON signal is input from at least one of the first front sensor FA and the second front sensor FB (Yes in S500), the main unit 60 proceeds to the process S110 and the next determined in the process S470 At the document conveyance timing, the motor control unit 80 is controlled so as to rotate the separation roller 31 in the normal direction, and the separation roller 31 starts the separation and conveyance operation of the next document Q.

  Here, it has been described that the conveyance of the next original Q is started after the driving of the second motor 55 is stopped (S490). However, as described above, the timing of the next original conveying is before the driving stop of the second motor 55. If it is the timing, the separation roller 31 can be rotated forward by executing the same processing as the processing S110 in advance. That is, the main unit 60 starts the rotation of the separation roller 31 for transporting the next original Q, and then executes the drive stop process (S490) of the second motor 55, and executes the processes after the process S110. It may be configured to.

  The mixed reading control process has been described above. Next, the first and second normal reading control processes executed by the main unit 60 will be described with reference to FIGS. 8 and 9. When the reading command in the normal mode is input, the main unit 60 performs the first normal reading control process and the second normal reading control process based on the input signals from the first front sensor FA and the second front sensor FB. Execute one of the following.

  Specifically, in the main unit 60, when both the input signal from the first front sensor FA and the input signal from the second front sensor FB are on signals, the large document Q is placed on the document tray 10. The first normal reading control process shown in FIG. 8 is executed. On the other hand, when the input signal from the first front sensor FA is an ON signal and the input signal from the second front sensor FB is an OFF signal, the main unit 60 places the small document Qs on the document tray 10. The second normal reading control process shown in FIG. 9 is executed. When the small document Qs is placed on the document tray 10 as shown by the broken line in FIG. 2, the input signal from the second front sensor FB is an off signal.

  In other words, when both the input signals from the first front sensor FA and the second front sensor FB are OFF signals when the reading command is input, the main unit 60 places the document Q on the document tray 10. It may be considered that the error screen is displayed on the user interface 95.

  When the first normal reading control process is started, the main unit 60 causes the motor control unit 80 to start driving the first motor 51, similarly to the process S110 (S610). As a result, the separation roller 31 operates to separate the document Q to be read from the document tray 10 and convey it downstream. After that, the main unit 60 waits until the separation roller 31 rotates by the predetermined amount or the input signal from the first rear sensor RA switches from the off signal to the on signal, similarly to the processes S120 and S130 (S620, S630). .

  If the separation roller 31 rotates by a predetermined amount without the input signal from the first rear sensor RA being switched to the ON signal (Yes in S620), the main unit 60 assumes that the conveyance error of the document Q has occurred as in the process S140. The user interface 95 is controlled to make a determination and display an error screen (S640).

  When the document Q is transported while the ON signal is input from the second front sensor FB, the input signal from the first rear sensor RA should be switched from the OFF signal to the ON signal according to the transport of the document Q. is there. That is, if the input signal from the first rear sensor RA remains the off signal, it is reasonable to estimate that a conveyance abnormality such as a jam has occurred. For this reason, in process S640, it determines with conveyance abnormality having generate | occur | produced and notifies generation | occurrence | production of conveyance abnormality toward a user. Thereafter, the main unit 60 ends the process based on the reading command by ending the first normal reading control process.

  When the input signal from the first rear sensor RA is switched from the off signal to the on signal (Yes in S630), the main unit 60 drives the motor control unit 80 to drive the first motor 51 until the separation roller 31 rotates by the predetermined amount. The motor control unit 80 is controlled to stop the rotation of the separation roller 31 when the separation roller 31 rotates by the predetermined amount (S650).

  Thereafter, the main unit 60 causes the motor control unit 80 to start driving the second motor 55 (S660). As a result, the transport mechanism 40 including the transport roller 41 operates to transport the document Q transported by the separation roller 31 downstream. The main unit 60 operates to temporarily store in the RAM 65 the rotation start time T1 of the conveying roller 41 driven by the second motor 55 (S660).

  Thereafter, the main unit 60 switches the input signal from the second rear sensor RB from the OFF signal to the ON signal, or the input signal from the second rear sensor RB remains the OFF signal until the first time elapses from time T1. Wait (S670, S680). When the first time elapses from time T1 with the second rear sensor RB kept off (Yes in S680), the main unit 60 determines that the conveyance error of the document Q has occurred, similarly to the process S640, and displays an error screen. The user interface 95 is controlled to display (S690).

  In step S690, it is determined that a conveyance abnormality has occurred. When a single-size document Q is placed on the document tray 10, basically all the documents Q are centered at the center line L0. This is because it should be arranged so as to be positioned above and should pass over the second rear sensor RB in the conveyance process. In step S690, when the occurrence of the conveyance abnormality is notified to the user, the main unit 60 ends the first normal reading control process.

  In addition, when the input signal from the second rear sensor RB is switched to the ON signal before the first time has elapsed (Yes in S670), the main unit 60 proceeds to processing S700. In step S700, the main unit 60 stores the time T2 when the second rear sensor RB is switched to the ON signal in the RAM 65. Further, the main unit 60 determines the reading start position Ps in the same manner as the process S210 based on the rotational position Pon2 of the second motor 55 at the time when the second rear sensor RB is switched to the ON signal (S710).

  When the reading start position Ps is determined, the main unit 60 starts the reading operation by the line sensor 20 under the control of the reading control unit 70 when the rotational position P of the second motor 55 reaches the reading start position Ps. Thus, a command is input to the reading control unit 70 (S720). After that, the main unit 60 executes the processing after the processing S230 shown in FIG. 6 as in the mixed reading control processing, and if the next document Q exists in the document tray 10, the next document determined in the processing S360. At the conveyance timing, the separation mechanism 30 starts the conveyance operation of the next document Q from the document tray 10 (S610).

  In addition, when the second normal reading control process (see FIG. 9) is started, the main unit 60 causes the motor control unit 80 to start driving the first motor 51, similarly to the process S110 (S810). As a result, the separation roller 31 operates to separate the document Q to be read from the document tray 10 and convey it downstream. After that, the main unit 60 waits until the separation roller 31 rotates by the predetermined amount or the input signal from the first rear sensor RA switches from the off signal to the on signal, similarly to the processes S120 and S130 (S820, S830). .

  When the input signal from the first rear sensor RA is switched to the ON signal (Yes in S830), the main unit 60 determines that a conveyance error of the document Q has occurred, and displays an error screen, as in the process S140. Thus, the user interface 95 is controlled (S840).

  When the document Q is transported while the off signal is input from the second front sensor FB, the input signal from the first rear sensor RA remains the off signal even if the transport operation of the document Q proceeds. Should be. That is, when the input signal from the first rear sensor RA is switched to the ON signal, it is reasonable to estimate that a skew that cannot be ignored has occurred.

  For this reason, in the second normal reading control process, unlike the mixed reading control process and the first normal reading control process, when the input signal from the first rear sensor RA is switched to the ON signal, a conveyance abnormality has occurred. Determination is made (S840). After the determination, when the occurrence of the conveyance abnormality is notified to the user, the main unit 60 ends the process based on the reading command by ending the second normal reading control process.

  When the separation roller 31 rotates a predetermined amount without the input signal from the first rear sensor RA being switched to the ON signal (Yes in S620), the main unit 60 causes the motor control unit 80 to stop the rotation of the separation roller 31. (S850). Thereafter, the main unit 60 causes the motor control unit 80 to start driving the second motor 55 (S860). Thereby, the transport mechanism 40 operates to transport the document Q transported by the separation roller 31 downstream. The main unit 60 operates to temporarily store in the RAM 65 the rotation start time T1 of the transport roller 41 driven by the second motor 55 (S860).

  Thereafter, the main unit 60 switches the input signal from the second rear sensor RB from the OFF signal to the ON signal, or the input signal from the second rear sensor RB remains the OFF signal until the first time elapses from time T1. Wait (S870, S880). When the first time elapses from time T1 while the second rear sensor RB remains off (Yes in S880), the main unit 60 determines that a conveyance error of the document Q has occurred, as in the process S840, and displays an error screen. The user interface 95 is controlled so as to be displayed (S890). When the occurrence of the conveyance abnormality is notified to the user, the main unit 60 ends the second normal reading control process.

  If the input signal from the second rear sensor RB is switched to the ON signal before the first time has elapsed (Yes in S870), the main unit 60 proceeds to processing S900. In step S900, the main unit 60 stores in the RAM 65 the time T2 when the second rear sensor RB is switched to the ON signal. Further, the main unit 60 determines the reading start position Ps in the same manner as the processes S210 and S710 based on the rotational position Pon2 of the second motor 55 at the time when the second rear sensor RB is switched to the ON signal (S910).

  When the reading start position Ps is determined, the main unit 60 starts the reading operation by the line sensor 20 under the control of the reading control unit 70 when the rotational position P of the second motor 55 reaches the reading start position Ps. In this manner, a command is input to the reading control unit 70 (S920). After that, the main unit 60 executes the processing after the processing S230 shown in FIG. 6 as in the mixed reading control processing, and if the next document Q exists in the document tray 10, the next document determined in the processing S360. At the conveyance timing, the separation mechanism 30 starts the conveyance operation of the next document Q (S810).

  The image reading apparatus 1 according to the present embodiment has been described above. According to the image reading apparatus 1 of the present embodiment, when a plurality of documents Q of different sizes are mixedly loaded on the document tray 10, the plurality of documents Q are arranged in a state where one side along the document transport direction is aligned. Among the documents, the document is placed so that the center of the document having the maximum width is aligned with the center line L0 of the document tray 10.

  The second rear sensor RB is located between the separation point by the separation roller 31 and the reading point by the line sensor 20 in the document conveyance direction, and the document Q passing through this point at a point near the center line L0. It arrange | positions so that it may detect.

  The first rear sensor RA is a point located between the separation point and the point where the document Q is detected by the second rear sensor RB (the installation point of the second rear sensor RB) in the document transport direction, and the document transport direction. In a direction orthogonal to the position where the side where the plurality of originals Q are aligned passes from the installation point of the second rear sensor RB, and is arranged so as to detect the original Q passing through this point. .

  The main unit 60 also detects the amount of the original Q reaching the installation point of the second rear sensor RB, and the first case where the second rear sensor RB detects the original Q when the conveying mechanism 40 conveys the original Q (S170). Yes), the distance δP2 in the document conveyance direction from the installation point of the second rear sensor RB to the reading point, the document conveyance amount (P-Pon2) after the second rear sensor RB detects the leading edge of the document Q, Based on the above, the reading start timing of the original Q by the line sensor 20 is controlled (S210, S220). Furthermore, the reading end timing of the document Q by the line sensor 20 is controlled based on the distance δP2 and the document conveyance amount (P-Poff2) after the second rear sensor RB detects the trailing edge of the document Q (P-Poff2). S300, S310).

  In addition, the main unit 60 has a second case in which the second rear sensor RB does not detect the document Q when the document Q reaches the installation position of the second rear sensor RB. In S180, the distance δP1 that is the distance from the point where the document Q is detected by the first rear sensor RA (the installation point of the first rear sensor RA) to the reading point, and the first rear sensor RA detects the leading edge of the document Q. The reading start timing of the original Q by the line sensor 20 is controlled based on the original conveyance amount (P-Pon1) after that (S400, S410). Further, the reading end timing of the document Q by the line sensor 20 is controlled based on the distance δP1 and the document conveyance amount (P-Poff1) after the first rear sensor RA detects the trailing edge of the document Q (S460). , S480).

  According to the image reading apparatus 1 of the present embodiment, the sensor RA that can detect the document Q is provided at a position away from the center line L0 as described above, and the document Q is not detected by the sensor RB on the center line L0 side. In this case, the reading start timing and the reading end timing by the line sensor 20 are controlled based on the detection result by the sensor RA disposed on the side where the sides of the document Q are aligned.

  Further, according to this image reading apparatus 1, in order to suppress the influence of the inclination of the original Q on the reading start timing and the reading end timing of the large-size original Q, the input from the sensor RB provided in the vicinity of the center line L0. Control based on the signal. Therefore, according to this embodiment, even when a document Q having a large size difference is mixedly loaded on the document tray 10, the reading start timing and the reading end timing of each document Q can be appropriately controlled.

  In addition, the image reading apparatus 1 according to the present embodiment is a third rear sensor that detects a document Q that passes through this point at a point downstream of the reading point in the document conveyance direction and near the center line L0. RC is provided. In the first case, the main unit 60 conveys a new document Q from the document tray 10 based on the time point (time T4) when the third rear sensor RC detects the trailing edge of the document Q. Timing is determined (S360).

  Further, in the second case, the main unit 60 conveys a new document Q from the document tray 10 on the basis of the time (time T5) when the first rear sensor RA detects the trailing edge of the document Q. Timing is determined (S470). Therefore, according to the image reading apparatus 1 of this embodiment, even when a document Q having a large size difference is mixedly loaded on the document tray 10, the conveyance timing of the document Q can be appropriately controlled, and the preceding document Q can be controlled. The next original Q can be quickly conveyed from the original tray 10 while preventing the next original Q from overlapping.

  In addition, the image reading apparatus 1 includes a first front sensor FA that detects the document Q placed on the document tray 10 at a point near the center line L0. Further, the image reading apparatus 1 detects the document Q placed on the document tray 10 on the side where the sides of the document Q are aligned with respect to the side where the document Q is detected by the first front sensor FA. A sensor FB is provided.

  Then, when the main unit 60 starts the first normal conveyance control process in the large-size original placement state in which the input signals of the first front sensor FA and the second front sensor FB are both ON signals, the original Q is the first original. If the input signal from the first rear sensor RA remains an off signal when the amount reaching the rear sensor RA is conveyed (Yes in S620), it is determined that a conveyance abnormality has occurred (S640).

  Further, the main unit 60 performs the second normal conveyance control process in a small document placing state in which the input signal from the first front sensor FA is an on signal and the input signal from the second front sensor FB is an off signal. When starting, if the input signal from the first rear sensor RA is an ON signal when the document Q is conveyed by an amount that reaches the first rear sensor RA (Yes in S830), it is determined that a conveyance abnormality has occurred. (S840).

  In addition, when the reading command in the normal mode is input, the main unit 60 does not include the originals Q of different sizes in the original tray 10, and all the originals Q have their centers on the center line L0. Under the premise that the second rear sensor RB is in the OFF signal, it is determined that a conveyance abnormality has occurred when the first time has elapsed from time T1 (S690, S890).

  Therefore, according to the image reading apparatus 1 of the present embodiment, in an environment in which the documents Q of different sizes are not mixedly loaded on the document tray 10, it is possible to appropriately prevent the occurrence of conveyance abnormality due to jamming of a large document and skew feeding of a small document. The error screen can be output to the user.

  As mentioned above, although the Example of this invention was described, this invention is not limited to the said Example, It can take a various aspect. For example, the sensors FA, RB, and RC may be provided on the center line L0, or may be provided at positions slightly away from the center line L0. The arrangement of the sensors FA, FB, RA, RB, RC described above is an example, and the present invention is not limited to the arrangement of the sensors FA, FB, RA, RB, RC described above.

  For example, the present invention can be applied to an image reading apparatus including a sensor disposed in a central region of a document conveyance path and a sensor disposed in an end region outside the central region. The document tray can be configured to have a configuration for aligning documents at a reference point in the central area of the document tray other than the center line L0. Any aspect included in the technical idea specified by the wording of the claims is an embodiment of the present invention.

  Finally, the correspondence between terms will be described. The main unit 60 corresponds to an example of a control unit. The document tray 10 corresponds to an example of a document placement table, and a point on the center line L0 corresponds to an example of a reference point. The separation mechanism 30 and the conveyance mechanism 40 correspond to an example of a conveyance unit, and the line sensor 20 corresponds to an example of a reading unit.

  In addition, the second rear sensor RB corresponds to an example of the first sensor, the first rear sensor RA corresponds to an example of the second sensor, the third rear sensor RC corresponds to an example of the third sensor, and the first The front sensor FA corresponds to an example of a fourth sensor, and the second front sensor FB corresponds to an example of a fifth sensor.

DESCRIPTION OF SYMBOLS 1 ... Image reading device, 3 ... External device, 10 ... Document tray, 15 ... Discharge tray, 20 ... Line sensor, 30 ... Separation mechanism, 31 ... Separation roller, 32 ... Reverse roller, 40 ... Conveyance mechanism, 41 ... Conveyance roller 45 ... discharge roller, 51 ... first motor, 52 ... transmission mechanism, 55 ... second motor, 56 ... transmission mechanism, 60 ... main unit, 61 ... CPU, 63 ... ROM, 65 ... RAM, 67 ... NVRAM, DESCRIPTION OF SYMBOLS 70 ... Reading control unit, 80 ... Motor control unit, 90 ... AD converter, 95 ... User interface, 99 ... Communication interface, FA ... First front sensor, FB ... Second front sensor, RA ... First rear sensor, RB ... Second rear sensor, RC ... third rear sensor, L0 ... center line, L1 ... sub-line, Q ... original.

Claims (5)

A document table in which a plurality of document is placed, the plurality of documents in a state where one side along the document transport direction are aligned, of the previous SL plurality of originals, orthogonal to the said document transportation direction The center of the document having the largest width in the direction is placed so as to be aligned with a reference point located between the first end and the second end of the document placing table in a direction orthogonal to the document transport direction. A document placement table,
A conveying unit that separates and conveys a document to be read from the plurality of documents placed on the document placing table by rotation of the roller ;
A reading unit that reads the original to be read conveyed by the conveying unit at a reading point downstream of the original conveying direction from a separation point where the original to be read is separated;
The first detection point corresponding to the reference point in a direction that is located between the separation point and the reading point in the document transport direction and is orthogonal to the document transport direction. A first sensor for detecting a document passing through the detection point;
In the document conveyance direction, the plurality of documents are aligned more than the first detection point in a direction that is located between the separation point and the reading point and is orthogonal to the document conveyance direction. A second sensor for detecting a document passing through the second detection point at a second detection point located on the side through which the side passes;
A control unit for controlling the transport unit and the reading unit;
The control unit comprises:
In a first case in which the first sensor detects the document to be read while the transport unit rotates the roller and transports the document to be read for a predetermined time, The reading is based on a first distance that is a distance from the first detection point to the reading point, and a document conveyance amount by the conveyance unit after the first sensor detects the leading edge of the document to be read. Controlling the reading start timing of the document to be read by the unit;
Time said predetermined second case the transport unit until conveying the original of the read target by rotating the roller was bought the first sensor and detect the document of the read target Then, after the second sensor detects the leading edge of the document to be read and the second distance which is the distance from the second detection point to the reading point where the document is detected by the second sensor. And a reading start timing of the document to be read by the reading unit based on a document conveyance amount by the conveyance unit. The control unit is
In the first case, the reading by the reading unit is based on the first distance and a document conveyance amount by the conveyance unit after the first sensor detects the trailing edge of the document to be read. Control the end of reading the target document,
In the second case, the reading by the reading unit is based on the second distance and a document conveyance amount by the conveyance unit after the second sensor detects the trailing edge of the document to be read. The reading apparatus according to claim 1, wherein the reading end timing of the target document is controlled. A document that passes through the third detection point at a third detection point corresponding to the reference point in a direction downstream of the reading point in the document conveyance direction and perpendicular to the document conveyance direction. A third sensor for detecting
The control unit is
In the first case, on the basis of the time point when the third sensor detects the trailing edge of the document to be read, the timing for transporting a new document from the document table to the transport unit is controlled.
In the second case, on the basis of the time point when the second sensor detects the trailing edge of the document to be read, the timing for transporting a new document from the document table to the transport unit is controlled. 3. A reading apparatus according to claim 1, wherein the reading apparatus is characterized in that: A fourth sensor for detecting a document placed on the document placement table at a fourth detection point corresponding to the reference point in a direction orthogonal to the document conveyance direction;
The document placed on the document placement table is detected at a point on the side where the aligned sides of the plurality of documents are arranged with respect to the fourth detection point in a direction orthogonal to the document transport direction. A fifth sensor;
With
The control unit is
When the transport unit starts transporting the document to be read in a large document placement state in which the document is detected by the fourth sensor and the fifth sensor, a predetermined rotation amount and the transport are performed. When the second sensor does not detect the document to be read until the unit rotates the roller and conveys the document to be read, it is determined that a conveyance abnormality has occurred,
When the transport unit starts transporting the document to be read in a small document placement state in which a document is detected by the fourth sensor but not detected by the fifth sensor, predetermined amount of rotation, until the transport unit transports the original to be read the by rotating the roller, and the second sensor when detecting a document, transport failure has occurred determined The reading device according to any one of claims 1 to 3, wherein: The control unit determines that a conveyance abnormality has occurred when the second case occurs under the condition that documents having different widths in a direction orthogonal to the document conveyance direction are not mixed on the document table. The reading device according to any one of claims 1 to 4, wherein

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