Image reading apparatus

Abstract

The present application provides an image reading device capable of reducing the possibility of processing efficiency decline. The image reading device comprises: a paper feeding tray on which a plurality of original documents are stacked; a conveying roller which conveys the uppermost original document among the plurality of original documents stacked on the paper feeding tray; a separating roller which is opposite to the conveying roller and separates the other original documents from the uppermost original document; a reading unit which reads the uppermost original document conveyed from the paper feeding tray; and a control unit which determines whether the uppermost original document conveyed from the paper feeding tray is an original document bound with the other original documents, and controls the conveying roller and the separating roller in such a manner that, in the case where the uppermost original document is determined to be an original document bound with the other original documents, the conveying roller is rotated in a reverse conveying manner of the uppermost original document, and after the uppermost original document is reversely conveyed, the conveying roller and the separating roller are rotated in a conveying manner of the uppermost original document without separating the other original documents from the uppermost original document.

Description

Technical Field

[0001] This invention relates to an image reading device. Background Technology

[0002] Patent Document 1 describes an image reading device that sequentially reads multiple original documents stacked on a supply tray by feeding them one by one. The image reading device is configured to detect original documents bound into a bundle. When the image reading device detects a bundled original document, it stops feeding the original document. This reduces the possibility of document congestion in the image reading device. After the user removes the bound original document from the image reading device, the feeding of original documents in the image reading device can be restarted.

[0003] In such an image reading device, the transport of the original document stops whenever a bundled original document is detected. In this case, user intervention is required to remove the bundled original document or retry the transport. Therefore, the processing efficiency of the image reading device may be reduced.

[0004] Patent document 1: International Publication No. 2020 / 188817. Summary of the Invention

[0005] An image reading apparatus for solving the above-mentioned problem includes: a paper supply tray on which a plurality of originals are stacked; a conveying roller for conveying the topmost original among the plurality of originals stacked on the supply tray; a separating roller opposite to the conveying roller for separating the other originals from the topmost original; a reading unit for reading the topmost original conveyed from the supply tray; and a control unit for determining whether the topmost original conveyed from the supply tray is an original bound together with other originals. The control unit performs control as follows: if it is determined that the topmost original is an original bound together with other originals, the conveying roller is rotated to reverse the conveying of the topmost original; and after the topmost original is reversed, the conveying roller and the separating roller are rotated to convey the topmost original without separating the other originals from the topmost original. Attached Figure Description

[0006] Figure 1 This is a schematic diagram illustrating an example of an image reading device equipped with a conveying mechanism.

[0007] Figure 2 A top view of a supply tray containing the bound originals.

[0008] Figure 3A top view of a supply tray containing original manuscripts with their tops bound.

[0009] Figure 4 This is a flowchart illustrating an example of a transport process. Detailed Implementation

[0010] Hereinafter, an example of an image reading device will be described with reference to the accompanying drawings. The image reading device is, for example, a sheet-feed scanner that reads an image recorded on an original by feeding the original (medium) such as paper or film.

[0011] Image reading device like Figure 1 As shown, the image reading device 11 includes a conveying device 12. The conveying device 12 is configured to convey original documents M0. More specifically, the conveying device 12 is configured to convey multiple original documents M0 one by one sequentially.

[0012] The image reading device 11 includes a reading unit 13. The reading unit 13 is configured to read original documents M0. Specifically, the reading unit 13 is configured to read multiple original documents M0 being transported via the transport device 12. The reading unit 13 is located within the transport device 12. The reading unit 13 reads the original documents M0 during their transport via the transport device 12. The reading unit 13 sequentially reads the multiple original documents M0 being transported via the transport device 12. The reading unit 13 can be configured to read only one side of the transported original document M0 or to read both sides. The reading unit 13 includes an image sensor. The reading unit 13 may include, for example, a CISM (Computer Integrated Sensor). The reading unit 13 can be configured to read the original document M0 in full color or in grayscale.

[0013] Conveying device The conveying device 12 includes a housing 14. In one example, the housing 14 houses the reading unit 13. In addition to the reading unit 13, the housing 14 can also house various structures of the conveying device 12.

[0014] The housing 14 has a supply path 15. The supply path 15 extends within the housing 14. The supply path 15 is a path through which the original document M0 is supplied toward the reading unit 13. The original document M0 is supplied into the housing 14 via the supply path 15. The supply path 15 is a path extending toward the reading unit 13. The reading unit 13 is located midway along the supply path 15.

[0015] The housing 14 has more than one discharge path. In one example, the housing 14 has a first discharge path 16 and a second discharge path 17. The discharge paths extend within the housing 14. The discharge paths extend from the supply path 15. The discharge paths are the paths through which the original document M0, which has passed through the reading section 13, passes. The original document M0 is discharged from the housing 14 via the discharge paths.

[0016] The first discharge path 16 and the second discharge path 17 extend in a manner that branches off from the supply path 15. The first discharge path 16 extends in a manner that splits into two branches from the supply path 15. The first discharge path 16 is a path that extends while bending. In one example, the first discharge path 16 extends while bending from the supply path 15 in a manner that reverses the orientation of the original document M0. The second discharge path 17 is a path that extends in a straight line. In one example, the second discharge path 17 extends in a straight line from the supply path 15 without changing the orientation of the original document M0.

[0017] The conveying device 12 includes a supply tray 18. The supply tray 18 is a tray holding multiple original documents M0. The supply tray 18 is a tray holding original documents M0 before reading. The supply tray 18 extends from the housing 14, for example. The supply tray 18 extends from the housing 14 in a manner that guides the original documents M0 toward the supply path 15. In one example, the supply tray 18 extends from the housing 14 in an upwardly inclined manner. Thus, the original documents M0 are easily guided from the supply tray 18 to the supply path 15.

[0018] The supply tray 18 has a stacking surface 19. The stacking surface 19 is the surface for stacking the original document M0. The stacking surface 19 is the upward-facing surface of the supply tray 18. A reference line 20 may also be formed on the stacking surface 19. The reference line 20 may be printed on the stacking surface 19 or formed by grooves engraved on the stacking surface 19.

[0019] The baseline 20 serves as a reference line for the original document M0 stacked on the supply tray 18. For example, when the baseline 20 is parallel to the rear end of the original document M0, the original document M0 can enter normally relative to the supply path 15. When the rear end of the original document M0 is inclined relative to the baseline 20, the original document M0 may enter at an angle relative to the supply path 15. The baseline 20 only needs to be located in the stacking surface 19 at a position that does not overlap with the original document M0.

[0020] The conveying device 12 includes one or more discharge trays. In one example, the conveying device 12 includes a first discharge tray 21 and a second discharge tray 22. The discharge tray is a tray for holding one or more original documents M0. The discharge tray is a tray that receives the original document M0 that has passed through the reading unit 13. The discharge tray is the discharge destination for the original document M0. The discharge tray receives the original document M0 discharged from the housing 14 via the discharge path. The discharge tray, for example, receives the original document M0 after it has been read.

[0021] The first discharge tray 21 receives the original manuscript M0 discharged from the housing 14 via the first discharge path 16. In one example, the first discharge tray 21 is formed by the upper surface of the housing 14. The second discharge tray 22 receives the original manuscript M0 discharged from the housing 14 via the second discharge path 17. In one example, the second discharge tray 22 extends from the housing 14.

[0022] The conveying device 12 includes a conveying section 23. The conveying section 23 is configured to convey original documents M0. The conveying section 23 conveys original documents M0 from the supply tray 18 toward the discharge tray. The conveying section 23 conveys original documents M0 from the supply tray 18 toward a first discharge tray 21, or from the supply tray 18 toward a second discharge tray 22. The conveying section 23 conveys multiple original documents M0 one by one sequentially from the supply tray 18. The conveying section 23 conveys original documents M0 along the supply path 15. The conveying section 23 conveys original documents M0 along the discharge path.

[0023] The conveying unit 23 includes a pickup roller 24. The pickup roller 24 is a roller that supplies original documents M0 from the supply tray 18 to the supply path 15. The pickup roller 24 is located in contact with the uppermost original document M0 among the plurality of original documents M0 accumulated on the supply tray 18. The pickup roller 24 supplies the uppermost original document M0 among the plurality of original documents M0 accumulated on the supply tray 18 into the housing 14. The pickup roller 24 conveys the original documents M0 accumulated on the supply tray 18 in the conveying direction Y1. The conveying direction Y1 is the direction from the supply tray 18 toward the housing 14.

[0024] The conveying unit 23 includes a conveying roller 25. The conveying roller 25 is a roller that conveys the original document M0 supplied by the pickup roller 24 to the reading unit 13. The conveying roller 25 conveys the original document M0 supplied by the pickup roller 24 along the supply path 15. The conveying roller 25 conveys the uppermost original document M0 among the multiple original documents M0 accumulated on the supply tray 18. The conveying roller 25 rotates either to convey the original document M0 or to convey the original document M0 in the reverse direction. The conveying roller 25 conveys the original document M0 toward the reading unit 13 or to convey the original document M0 in the reverse direction toward the supply tray 18.

[0025] The conveying unit 23 has a separating roller 26. The separating roller 26 is located opposite the conveying roller 25. Therefore, the separating roller 26 and the conveying roller 25 clamp the original document M0. The separating roller 26 and the conveying roller 25 clamp the original document M0 supplied by the pick-up roller 24.

[0026] The separating roller 26 is a roller that separates multiple original documents M0 one by one. In the conveying device 12, the pick-up roller 24 sometimes supplies multiple original documents M0 to the supply path 15. For example, sometimes the pick-up roller 24 supplies the top original document M0 to the supply path 15 in an overlapping state with other original documents M0. The separating roller 26 separates the multiple original documents M0 supplied by the pick-up roller 24 one by one. The separating roller 26 separates other original documents M0 from the top original document M0.

[0027] The separating roller 26 is configured to apply torque in the direction that returns the original document M0 from the supply path 15 toward the supply tray 18. The separating roller 26 can be configured to rotate in the direction that returns the original document M0 to the supply tray 18 due to the torque, or it can be configured to make it difficult for the original document M0 to rotate in the direction that allows it to be conveyed to the reading unit 13 due to the torque. When multiple original documents M0 enter between the conveyor roller 25 and the separating roller 26, the original documents M0 in contact with the conveyor roller 25 are conveyed to the reading unit 13, while the original documents M0 in contact with the separating roller 26 are not conveyed to the reading unit 13. Specifically, the original documents M0 in contact with the conveyor roller 25 are supplied to the reading unit 13, while the original documents M0 in contact with the separating roller 26 remain stationary. Thus, original documents M0 are conveyed one by one from the supply tray 18 to the reading unit 13.

[0028] The separating roller 26 is configured to switch the separating function. For example, the separating roller 26 is configured to switch the application of torque. Thus, the separating roller 26 can rotate in a manner that separates the original document M0, or in a manner that does not separate the original document M0. When the separating function is turned off, the separating roller 26 rotates in a manner that does not separate the original document M0. In this case, the separating roller 26 rotates in a manner that conveys the original document M0 toward the reading unit 13 together with the conveying roller 25.

[0029] The conveying unit 23 has one or more rotating rollers 27. In one example, the conveying unit 23 has multiple rotating rollers 27. The rotating rollers 27 are rollers that convey the original document M0 along the supply path 15 and the discharge path. The rotating rollers 27 convey the original document M0 supplied into the housing 14 toward the discharge tray. The rotating rollers 27 convey the original document M0 supplied by the conveying rollers 25 toward the discharge tray.

[0030] The conveying device 12 may also include a path switching mechanism 28. The path switching mechanism 28 is a mechanism for switching the discharge path through which the original document M0 passes. The path switching mechanism 28 switches the path through which the original document M0 passes between the first discharge path 16 and the second discharge path 17. By switching the discharge path, the path switching mechanism 28 guides the original document M0 to the first discharge tray 21 or to the second discharge tray 22.

[0031] The path switching mechanism 28 may also include a baffle 29. The baffle 29 is configured to block the first discharge path 16 or the second discharge path 17. The path switching mechanism 28 may also switch the discharge path via the baffle 29.

[0032] The path switching mechanism 28 may also include a displacement mechanism 30. The displacement mechanism 30 is connected to a rotating roller 27 located at the branch point of the first discharge path 16 and the second discharge path 17. The displacement mechanism 30 is configured to displace the rotating roller 27. The displacement mechanism 30 switches the discharge path by displacing the rotating roller 27.

[0033] The path switching mechanism 28 displaces the rotating roller 27 by misaligning the clamping points of the connected rotating roller 27 and the opposing rotating roller 27. Figure 1 In the example shown, the displacement mechanism 30 displaces the rotating roller 27 between the position shown by the solid line and the position shown by the dashed line. When the rotating roller 27 is in the position shown by the solid line, the original document M0 is guided to the first discharge path 16. When the rotating roller 27 is in the position shown by the dashed line, the original document M0 is guided to the second discharge path 17.

[0034] The displacement mechanism 30 can also be configured to switch the discharge path by rotating the shaft of the rotating roller 27. For example, the displacement mechanism 30 can also be configured to rotate the shaft of the rotating roller 27 by using one end of the shaft as a fulcrum to move the other end, thereby switching the discharge path.

[0035] The conveying device 12 may also include a float sensor 31. The float sensor 31 is a sensor that detects the floatation of the original document M0. The float sensor 31 can be a contact sensor or an optical sensor. The float sensor 31 is located along the supply path 15. The float sensor 31 detects the floatation of the original document M0 between the pick-up roller 24 and the conveying roller 25 along the supply path 15. The float sensor 31 detects the floatation of the original document M0 supplied from the supply tray 18. The float sensor 31 detects the floatation of the original document M0 supplied via the pick-up roller 24. The float sensor 31 detects the floatation of the original document M0 conveyed along the supply path 15.

[0036] The conveying device 12 may also include a photographing unit 32. The photographing unit 32 is located opposite the supply tray 18. The photographing unit 32 is located above the supply tray 18. The photographing unit 32 is located at a position for photographing the original manuscripts M0 stacked on the supply tray 18. The photographing unit 32 is located at a position for photographing at least the uppermost original manuscript M0 among the plurality of original manuscripts M0 stacked on the supply tray 18.

[0037] The imaging unit 32 generates imaging data D1 by photographing the original document M0. Imaging data D1 is image data obtained by photographing the original document M0 stacked on the paper supply tray 18. More specifically, imaging data D1 is image data obtained by photographing at least the topmost original document M0 among a plurality of original documents M0 stacked on the paper supply tray 18. Imaging data D1 can be either full-color image data or grayscale image data.

[0038] The camera unit 32 is located at least at the rear end of the original manuscript M0. The camera unit 32 may also be located at the top end of the original manuscript M0. For example, the camera unit 32 may also photograph the original manuscript M0 in a manner that illuminates the entire original manuscript M0 from the top to the rear end.

[0039] The imaging unit 32 is mounted on the housing 14. The imaging unit 32 extends from the housing 14 directly above the supply tray 18. The imaging unit 32 may also be configured to be housed within the housing 14. The imaging unit 32 may also have an imaging portion 33. The imaging portion 33 is configured to photograph the original document M0. The imaging portion 33 may include, for example, a camera. The imaging unit 32 may also have a support portion 34. The support portion 34 is configured to support the imaging portion 33. The support portion 34 extends from the housing 14. The support portion 34 may be, for example, an arm.

[0040] The imaging unit 32 can also be configured to be position-adjustable. For example, the imaging unit 32 can be configured to adjust the position of the imaging unit 33 by moving the support portion 34. The imaging unit 32 can be configured to adjust its position manually or automatically. Thus, the imaging unit 32 can appropriately photograph the original document M0 stacked on the supply tray 18.

[0041] The conveying device 12 can also be configured to mount a shooting device different from the image reading device 11 and the conveying device 12. The shooting device could be, for example, a user's smartphone, a handheld camera, etc. The shooting device can also be mounted on the conveying device 12 in such a way that it can photograph the original document M0 stacked on the supply tray 18. The conveying device 12 may also include, for example, a platform for mounting the shooting device, a mounting arm, etc.

[0042] The conveying device 12 may also include an illumination unit 35. The illumination unit 35 is configured to illuminate the supply tray 18. The illumination unit 35 is located opposite the supply tray 18. The illumination unit 35 illuminates the original document M0 stacked on the supply tray 18. As a result, the imaging unit 32 can easily photograph the original document M0.

[0043] The illumination unit 35 can also be mounted on the imaging unit 32. The position of the illumination unit 35 can also be adjusted as the position of the imaging unit 32 is adjusted. The illumination unit 35 can also be configured to be adjustable in position independently of the imaging unit 32. In this case, the illumination unit 35 can also be mounted on the housing 14 independently of the imaging unit 32. Alternatively, the illumination unit 35 can be housed within the housing 14.

[0044] The illumination unit 35 can also be configured to adjust the amount of light. The illumination unit 35 can be configured to adjust the amount of light automatically or manually by the user. The illumination unit 35 adjusts the amount of light so that the original M0 is properly illuminated in the shooting data D1. The illumination unit 35 can also adjust the amount of light so that the original M0 and the supply tray 18 are easily identifiable in the shooting data D1. The illumination unit 35 can also adjust the amount of light so that the edges of the original M0 are emphasized in the shooting data D1. The illumination unit 35 can also adjust the amount of light based on the illumination of the object being adjusted formed on the supply tray 18.

[0045] The transport device 12 may also include a storage unit 36. The storage unit 36 ​​is configured to store more than one program. The storage unit 36 ​​stores the program that causes the transport device 12 to transport the original document M0. The storage unit 36 ​​may also store the program that causes the image reading device 11 to read the original document M0. The storage unit 36 ​​includes a memory such as ROM or RAM. The storage unit 36 ​​may also include a storage medium such as an HDD or SSD.

[0046] In addition to the program, the storage unit 36 ​​can also store data used during transmission, reading, etc. The storage unit 36 ​​stores the captured data D1. For example, the storage unit 36 ​​stores the captured data D1 generated by the imaging unit 32. The storage unit 36 ​​can also store captured data D1 sent from an external device different from the image reading device 11 and the transmission device 12.

[0047] The storage unit 36 ​​can also store more than one threshold. For example, the storage unit 36 ​​can also store a first threshold and a second threshold. The threshold is a value used in determining whether the topmost original M0 is a copy of another original M0 bound together with other originals M0. Specifically, the threshold is a value compared to the tilt angle of the original M0. The storage unit 36 ​​can store thresholds either for each size of the original M0 or for each type of original M0.

[0048] The storage unit 36 ​​can also store pattern images. The pattern image is used in determining whether the topmost original M0 is an image of an original M0 bound together with other originals M0. More specifically, the pattern image is used in pattern matching for the captured data D1.

[0049] Storage unit 36 ​​can also store the machined model. The model is configured to output a determination value based on the captured data D1, indicating whether the topmost original M0 is a document M0 bound together with other originals M0. In one example, the model is configured to output a determination value by being inputted from the captured data D1. The model can also be configured to output a determination value by being inputted from parameters representing the feature quantities contained in the captured data D1. The determination value includes, for example, a value indicating that the topmost original M0 is a document M0 bound together with other originals M0, and a value indicating that the topmost original M0 is not a document M0 bound together with other originals M0.

[0050] The model is generated by training a machine learning model using learning data. The machine learning model learns the correspondence between input and output parameters based on the learning data. This generates the mapping data between the input and output parameters, i.e., the model. The learning method can be teacher-guided learning based on neural networks, or other methods. Deep learning can also be used. The learning data can be photographic data D1 that reflects a bound original manuscript M0, photographic data D1 that reflects an unbound original manuscript M0, or both. By using such learning data to train the machine learning model, a model is generated that classifies the original manuscript M0 reflected in photographic data D1 as either a bound original manuscript M0 or an unbound original manuscript M0.

[0051] The transport device 12 may also include a control unit 37. The control unit 37 is configured to execute processing according to a program stored in the storage unit 36. The control unit 37 includes processors such as CPUs, GPUs, and TPUs. The control unit 37 is not limited to processors; it may also include hardware circuits such as ASICs. In this way, the control unit 37 and the storage unit 36 ​​together implement a computer. Therefore, the transport device 12 includes a computer.

[0052] The control unit 37 is configured to provide unified control over the conveying device 12. The control unit 37 can also control the reading unit 13. The control unit 37 can also be configured to provide unified control over the image reading device 11.

[0053] The control unit 37 is configured to acquire shooting data D1. In one example, the control unit 37 acquires shooting data D1 from the shooting unit 32. The control unit 37 may also acquire shooting data D1 from the shooting device. The control unit 37 may also acquire shooting data D1 from the shooting device by communicating with it. The control unit 37 may also acquire shooting data D1 stored in an external computer. The control unit 37 stores the acquired shooting data D1 in the storage unit 36. The control unit 37 acquires shooting data D1 after the supply begins. In addition to shooting data D1 acquired after the supply begins, the control unit 37 may also acquire shooting data D1 acquired before the supply begins.

[0054] The control unit 37 is configured to analyze the captured data D1. The control unit 37 can also analyze the captured data D1 by performing image processing on it according to a program. The control unit 37 can also analyze the captured data D1 by performing contrast adjustment, pixel conversion, noise removal, or edge enhancement. For example, the control unit 37 can also analyze the captured data D1 by detecting the edges of the original document M0. The control unit 37 can also analyze the captured data D1 by extracting feature values ​​from it and inputting these feature values ​​into a model. The control unit 37 can also analyze the captured data D1 by inputting it into a model. The control unit 37 analyzes the captured data D1 after the supply begins. The control unit 37 can also analyze the captured data D1 before the supply begins.

[0055] The control unit 37 can also adjust the shooting unit 32 based on the shooting data D1. Specifically, the control unit 37 can also adjust the position of the shooting unit 32 based on the shooting data D1 before the start of the shooting. The control unit 37 can also adjust the position of the shooting unit 32 by analyzing the shooting data D1 before the start of the shooting. The control unit 37 can also automatically adjust the position of the shooting unit 32, for example. The control unit 37 can also adjust the position of the shooting unit 32 by displaying a message prompting the user to adjust the shooting unit 32 on a screen such as an operation panel. The control unit 37 adjusts the position of the shooting unit 32 in a manner that appropriately reflects the original document M0.

[0056] The control unit 37 can also adjust the illumination unit 35 based on the shooting data D1. Specifically, the control unit 37 can also adjust the position, light intensity, etc., of the illumination unit 35 based on the shooting data D1 before the start of the supply. The control unit 37 can also adjust the position, light intensity, etc., of the illumination unit 35 by analyzing the shooting data D1 before the start of the supply. The control unit 37 can also automatically adjust the position, light intensity, etc., of the illumination unit 35. The control unit 37 can also adjust the position and light intensity of the illumination unit 35 by displaying a message prompting the user to adjust the illumination unit 35 on the screen. The control unit 37 adjusts the illumination unit 35 in a manner that appropriately reflects the original document M0.

[0057] like Figure 2 as well as Figure 3 As shown, in the conveying device 12, sometimes bound originals M0 are accumulated on the supply tray 18. In the conveying device 12, for example, sometimes the first original M1 and the second original M2 of a plurality of originals M0 are accumulated on the supply tray 18 in a bound state. Specifically, sometimes the first original M1 and the second original M2, which are bound together by staples, are accumulated on the supply tray 18. The first original M1 is the topmost original M0 among the plurality of originals M0 accumulated on the supply tray 18. The second original M2 is the next original M0 after the first original M1 among the plurality of originals M0 accumulated on the supply tray 18. Figure 2 In the example shown, the rear ends of the first original M1 and the second original M2 are bound together. Specifically, in... Figure 2 In the example shown, the corner portions at the rear ends of the first original M1 and the second original M2 are bound together. Figure 3 In the example shown, the tops of the first original M1 and the second original M2 are bound together. Specifically, in... Figure 3 In the example shown, the corner portions at the top of the first original M1 and the second original M2 are bound together.

[0058] When the rear ends of the first original M1 and the second original M2 are bound together, as the first original M1 is conveyed, the rear ends of both the first original M1 and the second original M2 will float up. Specifically, since the first original M1 proceeds ahead of the second original M2, the rear end of the first original M1 pulls on the rear end of the second original M2. Thus, the rear ends of both the first original M1 and the second original M2 float up. If the rear ends of the first original M1 and the second original M2 float up, a shadow S0 will appear between the first original M1 and the second original M2.

[0059] When the tops of the first original M1 and the second original M2 are bound together, the first original M1 will tilt relative to the second original M2 during the feeding operation. Specifically, the first original M1 is fed with the unbound corner of one of the two top corners of the first original M1 preceding the second original M2. Thus, the first original M1 will tilt relative to the second original M2. If the first original M1 tilts relative to the second original M2, the tilt of the first edge line L1 relative to the tilt of the second edge line L2 will change. The first edge line L1 is a line representing the edge of the first original M1. In one example, the first edge line L1 represents the edge of the rear end of the first original M1. The second edge line L2 is a line representing the edge of the second original M2. In one example, the second edge line L2 represents the edge of the rear end of the second original M2. Typically, the original M0 is stacked on the supply tray 18 with its edge lines parallel to the baseline 20.

[0060] The control unit 37 is configured to determine whether the topmost original M0 is a document M0 bound together with other originals M0. In one example, the control unit 37 determines whether the topmost original M0 is a document M0 bound together with other originals M0 based on the image data D1. The control unit 37 is not limited to the image data D1; for example, it may determine whether the topmost original M0 is a document M0 bound together with other originals M0 based on the detection results of a sensor. The control unit 37 may also determine whether the topmost original M0 is a document M0 bound together with other originals M0 by detecting the status of staples using a sensor. The control unit 37 may also determine whether the topmost original M0 is a document M0 bound together with other originals M0 based on the load generated in the pick-up roller 24, the conveyor roller 25, etc.

[0061] The control unit 37 determines whether the first original M1 is a bound original M0 based on the shooting data D1 after the supply starts. The control unit 37 determines whether the first original M1 is a bound original M0 by analyzing the shooting data D1. The shooting data D1 after the supply starts contains data that captures the first original M1 and the second original M2. In the shooting data D1 after the supply starts, the second original M2 is reflected because the first original M1 is being transported. In the shooting data D1 after the supply starts, if the first original M1 and the second original M2 are bound together, a shadow S0 will be reflected between the first original M1 and the second original M2, or the first original M1, whose first edge line L1 is significantly tilted relative to the second edge line L2, will be reflected.

[0062] The control unit 37 can also detect the shadow S0 based on the shooting data D1. Specifically, the control unit 37 can also detect the shadow S0 located between the first original M1 and the second original M2 by analyzing the shooting data D1. In the shooting data D1, the control unit 37 detects the pixels representing the shadow S0 based on brightness values. For example, in the shooting data D1, the shadow S0 is shown as a pixel with a brightness lower than that of the pixels representing the original M0.

[0063] The control unit 37 can also determine whether the first original M1 is a bound original M0 based on the shadow S0. The control unit 37 can also determine that the first original M1 is a bound original M0 if the shadow S0 is detected. For example, the control unit 37 can also determine whether the first original M1 is a bound original M0 based on the presence or absence of the shadow S0 in the detection area R0. The detection area R0 is the area surrounded by the edges of the first original M1 and the second original M2. In the image data D1, the detection area R0 is shown as pixels surrounded by pixels representing the edges of the first original M1 and the second original M2. The control unit 37 detects the detection area R0 by detecting the edges of the first original M1 and the second original M2. The control unit 37 detects the detection area R0 by identifying the first original M1 and the second original M2. For example, the control unit 37 may determine whether the first original M1 is a bound original M0 based on the presence or absence of the shadow S0 in the area occupied by the original M0. In this case, the control unit 37 can detect the shadow S0 between the first original M1 and the second original M2 without identifying the first original M1 and the second original M2.

[0064] The control unit 37 can also determine whether the first original M1 is a bound original M0 based on the shape of the shadow S0. The control unit 37 can also perform pattern matching based on the shape of the shadow S0. The control unit 37 can also match the pattern image stored in the storage unit 36 ​​with the shooting data D1. In this case, the pattern image is an image representing the shape of the shadow S0 generated between the first original M1 and the second original M2. The control unit 37 can also determine that a shadow S0 has appeared between the first original M1 and the second original M2 if the shadow S0 of the shooting data D1 matches the shadow S0 of the pattern image through pattern matching. That is, the control unit 37 can also determine that a shadow S0 has been detected if the shadow S0 of the shooting data D1 matches the shadow S0 of the pattern image. The control unit 37 can also determine that the first original M1 is a bound original M0 if the shadow S0 of the shooting data D1 matches the shadow S0 of the pattern image. By taking into account the shape of the shadow S0, the accuracy of determining whether the topmost original M0 is the bound original M0 is improved. For example, the possibility that the control unit 37 will mistake an image printed on the second original M2 for the shadow S0 is reduced.

[0065] The control unit 37 can also detect edge lines based on the shooting data D1. Specifically, the control unit 37 can analyze the shooting data D1 after the supply begins to detect the first edge line L1 and the second edge line L2. For example, the control unit 37 can also detect edge lines by binarizing the shooting data D1. The control unit 37 can also binarize the pixels representing the background color and the pixels representing other colors in the shooting data D1. In one example, the control unit 37 converts the pixels representing the background color to white and the pixels representing other colors to gray. The control unit 37 detects the outline of the area represented by the gray pixels as the edge of the original document M0. Specifically, the control unit 37 detects points P1, P2, P3, and P4 located upstream in the transport direction Y1 within the outline of the area represented by the gray pixels. Points P1, P2, P3, and P4 are characteristic points within the outline of the area representing the original document M0. Points P1, P2, P3, and P4 represent, for example, corners of the original document M0, points where the original documents M0 intersect, etc. The straight line connecting points P1 and P2 represents the second edge line L2. The straight line connecting points P3 and P4 represents the first edge line L1. That is, the control unit 37 detects the first edge line L1 and the second edge line L2 by detecting points P1, P2, P3, and P4. The control unit 37 can also binarize the captured data D1 by extracting the outlines of the first original document M1 and the second original document M2. The control unit 37 can also detect the first edge line L1 and the second edge line L2 based on the outlines of the first original document M1 and the second original document M2.

[0066] The control unit 37 can also determine whether the first original M1 is a bound original M0 based on the edge lines. The control unit 37 can also determine whether the first original M1 is a bound original M0 based on the first edge line L1 and the second edge line L2. For example, the control unit 37 can also determine whether the first original M1 is a bound original M0 based on the shape of the first edge line L1 and the shape of the second edge line L2.

[0067] The control unit 37 can also detect the tilt of the edge lines based on the captured data D1. In one example, the control unit 37 detects the tilt of the first edge line L1 relative to the reference line 20 and the tilt of the second edge line L2 relative to the reference line 20. Not limited to the tilt relative to the reference line 20, the control unit 37 can also calculate the tilt of the first edge line L1 relative to the second edge line L2.

[0068] The control unit 37 can also determine whether the first original M1 is a bound original M0 based on the inclination of the edge lines. The control unit 37 can also determine whether the first original M1 is a bound original M0 bound together with the second original M2 based on the inclination of the first edge line L1 relative to the reference line 20 and the inclination of the second edge line L2 relative to the reference line 20. The control unit 37 can also determine whether the first original M1 is a bound original M0 based on the inclination of the first edge line L1 relative to the second edge line L2. The control unit 37 can also determine whether the first original M1 is a bound original M0 based on the inclination of the first edge line L1 relative to the reference line 20.

[0069] The control unit 37 can also compare the inclination of the edge line with a threshold. In one example, the control unit 37 compares the inclination of the first edge line L1 relative to the baseline 20 with a first threshold. The control unit 37 compares the inclination of the second edge line L2 relative to the baseline 20 with a second threshold. The first threshold and the second threshold can be the same value or different values.

[0070] The control unit 37 may also determine that the first original M1 is a bound original M0 when the inclination of the first edge line L1 relative to the baseline 20 exceeds a first threshold and the inclination of the second edge line L2 relative to the baseline 20 is below a second threshold. Not limited to this, the control unit 37 may, for example, determine that the first original M1 is a bound original M0 when the inclination of the first edge line L1 relative to the second edge line L2 exceeds a threshold.

[0071] The control unit 37 is not limited to detecting the shadow S0 and edge lines; it can also determine whether the original document M0 has been bound using other methods. For example, the control unit 37 can compare the shooting data D1 before the start of supply with the shooting data D1 after the start of supply to determine whether the original document M0 has been bound. That is, the control unit 37 can also determine whether the original document M0 has been bound by detecting changes in the posture of the original document M0 based on the shooting data D1.

[0072] When the control unit 37 determines that the original manuscript M0 has been bound, it rotates the conveyor roller 25 to reverse the transport of the original manuscript M0. That is, the control unit 37 rotates the conveyor roller 25 to return the original manuscript M0 to the supply tray 18. This eliminates the offset between the first original manuscript M1 and the second original manuscript M2 caused by the first original manuscript M1 traveling ahead of the second original manuscript M2. By reversing the transport of the original manuscript M0 via the conveyor roller 25, the first original manuscript M1 and the second original manuscript M2 are returned to an overlapping position.

[0073] After the original manuscript M0 has been transported in reverse, the control unit 37 rotates the conveyor roller 25 and the separation roller 26 to transport the original manuscript M0 without causing it to separate. Specifically, the control unit 37 transports the bound original manuscript M0 with the separation function of the separation roller 26 turned off. By turning off the separation function, the bound original manuscript M0 is transported without clogging the space between the conveyor roller 25 and the separation roller 26. The control unit 37 transports the bound original manuscript M0 directly from the supply path 15 to the discharge path without reading it through the reading unit 13. Therefore, the conveying device 12 can discharge the bound original manuscript M0 to the discharge tray without requiring the user to remove it. This reduces the possibility of a decrease in processing efficiency.

[0074] The control unit 37 discharges the bound manuscript M0 to the second discharge tray 22. Specifically, when the control unit 37 determines that the manuscript M0 is bound, it guides the manuscript M0 towards the second discharge path 17. The control unit 37 discharges the bound manuscript M0 to the second discharge tray 22 via the second discharge path 17. The control unit 37 discharges the unbound manuscript M0 to the first discharge tray 21. Specifically, when the control unit 37 determines that the manuscript M0 is unbound, it guides the manuscript M0 towards the first discharge path 16. That is, the control unit 37 guides the read manuscript M0 towards the first discharge path 16. The control unit 37 discharges the unbound manuscript M0 to the first discharge tray 21 via the first discharge path 16. Thus, the conveying device 12 can distinguish between bound and unbound manuscripts M0.

[0075] When the top of the original document M0 is bound, it is more susceptible to damage during the conveying process compared to when the bottom of the original document M0 is bound. Specifically, because the separating roller 26 aims to separate the bound original document M0, the top-bound original document M0 is more prone to damage. The separating roller 26 separates the original document M0 in a manner that separates the tops of the first original document M1 and the second original document M2 from each other. Therefore, when the top of the original document M0 is bound, the load applied to the original document M0 is greater.

[0076] The control unit 37 can also temporarily stop the conveyor roller 25 if the float sensor 31 detects that the original document M0 has floated. When the tops of the first original document M1 and the second original document M2 are bound together, if the first original document M1 and the second original document M2 enter between the conveyor roller 25 and the separation roller 26, the first original document M1 is likely to float relative to the second original document M2. Therefore, the control unit 37 determines that the original document M0 may be bound by detecting the float of the original document M0 by the float sensor 31. The control unit 37 temporarily stops the conveyor roller 25 if the original document M0 may be bound. This reduces the possibility of damage to the original document M0. If the float sensor 31 does not detect the float of the original document M0, the control unit 37 continues to convey the original document M0 directly.

[0077] After temporarily stopping the conveyor roller 25, the control unit 37 determines whether the document M0 is a bound original. The control unit 37 determines whether the document M0 is bound based, for example, on the image data D1. If the control unit 37 determines that the document M0 is bound, it reverses the conveyor roller 25 and disables the separation function based on the separation roller 26. If the control unit 37 determines that the document M0 is not bound, it restarts the rotation of the conveyor roller 25.

[0078] Conveying and processing Next, an example of the transport process will be described. The transport process is the process of transporting the original document M0. In one example, the transport process includes the process of reading the transported original document M0. The transport process is executed by the control unit 37 processing the program stored in the storage unit 36. The transport process is started, for example, by receiving an instruction to start reading from the user.

[0079] like Figure 4 As shown, in step S11, the control unit 37 drives the pickup roller 24. As a result, the topmost original M0 among the multiple originals M0 stacked on the supply tray 18 is supplied to the supply path 15.

[0080] In step S12, the control unit 37 determines whether the float sensor 31 has detected the original document M0 floating. If the float sensor 31 has detected the original document M0 floating, the control unit 37 transfers the processing to step S13. If the float sensor 31 has not detected the original document M0 floating, the control unit 37 transfers the processing to step S14.

[0081] In step S13, the control unit 37 temporarily stops the conveyor roller 25. If the float sensor 31 detects that the original document M0 has floated, it is possible that the original document M0 with its top bound is being conveyed. Therefore, the control unit 37 temporarily stops the conveyor roller 25 to prevent damage to the original document M0.

[0082] In step S14, the control unit 37 acquires the shooting data D1. In one example, the control unit 37 acquires the shooting data D1 from the shooting unit 32. The control unit 37 may also acquire the shooting data D1 from an external shooting device.

[0083] In step S15, the control unit 37 determines whether the first original M1 is a bound original M0. In one example, the control unit 37 determines whether the first original M1 is a bound original M0 based on the shooting data D1. The control unit 37 determines whether the first original M1 is a bound original M0 by analyzing the shooting data D1 obtained in step S14.

[0084] In step S15, the control unit 37 first determines whether the original document M0 is top-bound. Therefore, the control unit 37 analyzes the captured data D1 to detect edge lines. Based on the edge lines, the control unit 37 determines whether the original document M0 is top-bound. The control unit 37 determines whether the original document M0 is top-bound by comparing the tilt of the edge lines with a threshold. If the control unit 37 determines that the original document M0 is top-bound, the process proceeds to step S16.

[0085] If, in step S15, the control unit 37 determines that the original M0 is not top-bound, it then determines whether the original M0 is back-bound. Therefore, the control unit 37 analyzes the captured data D1 to detect the shadow S0. Based on the shadow S0, the control unit 37 determines whether the original M0 is back-bound. If the control unit 37 determines that the original M0 is back-bound, it proceeds to step S16. If the control unit 37 determines that the original M0 is neither top-bound nor back-bound, it proceeds to step S20.

[0086] In step S16, the control unit 37 reverse-feeds the original document M0 via the conveyor roller 25. At this time, the control unit 37 reverse-feeds the document to eliminate the offset of the first original document M1 relative to the second original document M2. The control unit 37 controls the drive amount of the conveyor roller 25 to eliminate the offset of the first original document M1 relative to the second original document M2. The control unit 37 may, for example, control the drive amount of the conveyor roller 25 based on the newly acquired shooting data D1 from the shooting unit 32. The control unit 37 may also control the drive amount of the conveyor roller 25 based on the load acting on the conveyor roller 25. By controlling the drive amount of the conveyor roller 25 by the control unit 37, the document is returned to the same overlapping position as before the supply began.

[0087] In step S17, the control unit 37 sets the separation function based on the separation roller 26 to off. For example, the control unit 37 cuts off the torque acting on the separation roller 26. As a result, the separation roller 26 rotates passively relative to the conveying roller 25.

[0088] In step S18, control unit 37 conveys the original document M0 via conveying roller 25 and separating roller 26. That is, control unit 37 attempts to convey the original document M0 again with the separating function off. By turning off the separating function, control unit 37 can convey the bound original document M0 without causing blockage. At this time, control unit 37 does not read the original document M0 via reading unit 13.

[0089] In step S19, control unit 37 discharges the original document M0 onto the second discharge tray 22. Control unit 37 guides the original document M0 towards the second discharge path 17 via path switching mechanism 28. Control unit 37 discharges the original document M0 onto the second discharge tray 22 via the second discharge path 17. Control unit 37 terminates the transport process when the discharge of the original document M0 is complete. Control unit 37 repeatedly performs the transport process even when original document M0 remains on the supply tray 18.

[0090] In step S20, the control unit 37 reads the original document M0 via the reading unit 13. During the transport process, after determining whether the original document M0 is bound, the control unit 37 transports the original document M0 to the reading unit 13. Thus, the transport process proceeds smoothly.

[0091] In step S21, the control unit 37 discharges the original document M0 onto the first discharge tray 21. The control unit 37 terminates the transport process when the discharge of the original document M0 is complete. The control unit 37 repeatedly performs the transport process even when original document M0 remains on the supply tray 18.

[0092] The role and effects of the embodiments Next, the function and effects of the above embodiments will be explained.

[0093] (1) When the control unit 37 determines that the topmost original M0 is a document M0 bound together with other original documents M0, it rotates the conveyor roller 25 to reverse the transport of the topmost original M0. After reversing the transport of the topmost original M0, the control unit 37 rotates the conveyor roller 25 and the separation roller 26 to transport the topmost original M0 without separating it from the other original documents M0. When the topmost original M0 is bound together with other original documents M0, transporting the topmost original M0 by the conveyor roller 25 causes it to precede the other original documents M0. Therefore, reversing the transport of the topmost original M0 by the conveyor roller 25 returns it to a state where it does not precede the other original documents M0. According to the above structure, when the topmost original M0 is not ahead of the other originals M0, the control unit 37 rotates the conveyor roller 25 and the separation roller 26 to convey the topmost original M0 without separating it from the other originals M0. Therefore, the topmost original M0 is conveyed while still bound together with the other originals M0. This reduces the possibility of decreased processing efficiency.

[0094] (2) If the control unit 37 determines that the topmost original M0 is not bound together with other originals M0, it discharges the topmost original M0 onto the first discharge tray 21. If the control unit 37 determines that the topmost original M0 is bound together with other originals M0, it discharges the topmost original M0 onto the second discharge tray 22. According to the above structure, the image reading device 11 can separate the multiple originals M0 accumulated on the supply tray 18 into bound originals M0 and unbound originals M0. This improves ease of use.

[0095] (3) The control unit 37 determines whether the topmost original M0 is a document M0 bound together with other original documents M0 based on the first edge line L1 and the second edge line L2. According to the above structure, the control unit 37 can determine with high accuracy whether the topmost original M0 is a document M0 bound together with other original documents M0.

[0096] (4) If the inclination of the first edge line L1 exceeds the first threshold and the inclination of the second edge line L2 is below the second threshold, the control unit 37 determines that the topmost original M0 is an original M0 bound together with other originals M0. Based on the above structure, the control unit 37 can determine with high accuracy whether the topmost original M0 is an original M0 bound together with other originals M0.

[0097] (5) When the float sensor 31 detects that the topmost original M0 has floated, the control unit 37 temporarily stops the conveyor roller 25. After temporarily stopping the conveyor roller 25, if the control unit 37 determines that the topmost original M0 is bound together with other originals M0, it rotates the conveyor roller 25 to transport the topmost original M0 in the reverse direction. After temporarily stopping the conveyor roller 25, if the control unit 37 determines that the topmost original M0 is not bound together with other originals M0, it restarts the rotation of the conveyor roller 25 to transport the topmost original M0. If the topmost original M0 is bound together with other originals M0 at its tip, and if the topmost original M0 precedes the other originals M0, the topmost original M0 is prone to float. That is, if the top of the top original M0 is bound together with other originals M0, the top original M0 is easily detected by the float sensor 31. Since the top of the top original M0 is bound together with other originals M0, it is easy for the top original M0 to be damaged because it rises ahead of the other originals M0. Therefore, according to the above structure, when the float sensor 31 detects the top original M0 rising, the control unit 37 temporarily stops the conveyor roller 25. While the conveyor roller 25 is temporarily stopped, the control unit 37 can determine whether the top original M0 is bound together with other originals M0. This reduces the possibility of damage caused by the top original M0 rising ahead of the other originals M0.

[0098] (6) The control unit 37 detects the shadow S0 located between the first original M1 and the second original M2 based on the shooting data D1. If the shadow S0 is detected, the control unit 37 determines that the first original M1 is the original M0 bound together with the second original M2. According to the above structure, the control unit 37 can determine with high accuracy whether the first original M1 is the original M0 bound together with the second original M2.

[0099] (7) The control unit 37 obtains shooting data D1 from the shooting unit 32. Based on the shooting data D1, the control unit 37 determines whether the top original M0 is an original M0 that is bound together with other originals M0. According to the above structure, the control unit 37 can determine with high accuracy whether the top original M0 is an original M0 that is bound together with other originals M0 based on the shooting data D1.

[0100] (8) If the control unit 37 determines that the topmost original M0 is not bound together with other originals M0, it guides the topmost original M0 to be discharged through the first discharge path 16. If the control unit 37 determines that the topmost original M0 is bound together with other originals M0, it guides the topmost original M0 to be discharged through the second discharge path 17. When the topmost original M0, which is bound together with other originals M0, is discharged through the first discharge path 16, the original M0 may become clogged because the first discharge path 16 extends while bending. In this regard, according to the above structure, since the topmost original M0, which is bound together with other originals M0, is discharged through the second discharge path 17, the original M0 is discharged smoothly. This reduces the possibility of a decrease in processing efficiency.

[0101] Technical ideas The technical concepts and their effects, as described in the above embodiments, are described below.

[0102] (A) An image reading apparatus comprising: a paper feed tray on which a plurality of originals are stacked; a conveying roller for conveying the topmost original among the plurality of originals stacked on the feed tray; a separating roller opposite to the conveying roller for separating other originals from the topmost original; a reading unit for reading the topmost original conveyed from the feed tray; and a control unit for determining whether the topmost original conveyed from the feed tray is an original bound together with other originals, wherein the control unit controls the conveying roller to rotate in such a way that, if it is determined that the topmost original is an original bound together with other originals, the conveying roller is rotated in such a way that the topmost original is conveyed in reverse, and after the topmost original is conveyed in reverse, the conveying roller and the separating roller are rotated in such a way that the topmost original is conveyed without separating other originals from the topmost original. When the top original is bound together with the other originals, it is conveyed by the conveyor rollers, causing it to proceed ahead of the other originals. Therefore, by reversing the conveyor rollers, the top original is returned to a state where it is not ahead of the other originals. Based on this structure, the control unit rotates the conveyor rollers and the separation rollers to convey the top original without separating it from the other originals, even when it is not ahead of the other originals. Thus, the top original is conveyed while bound together with the other originals. This reduces the possibility of a decrease in processing efficiency.

[0103] (B) The image reading device described above may also include: a first discharge tray, which is the discharge destination for the topmost original document conveyed by the conveyor roller; and a second discharge tray, which is the discharge destination for the topmost original document conveyed by the conveyor roller. The control unit performs control such that, if it is determined that the topmost original document is not bound together with other original documents, the topmost original document is discharged onto the first discharge tray; and if it is determined that the topmost original document is bound together with other original documents, the topmost original document is discharged onto the second discharge tray. According to the above structure, the image reading device can separate multiple original documents accumulated on the supply tray into bound original documents and unbound original documents. This improves ease of use.

[0104] (C) In the image reading device described above, the control unit may also perform the following control: acquiring image data obtained from photographing the topmost original, detecting a first edge line in the topmost original based on the image data, detecting a second edge line in the next original document based on the image data, and determining whether the topmost original document is bound together with other original documents based on the first edge line and the second edge line. According to this structure, the control unit can determine with high accuracy whether the topmost original document is bound together with other original documents.

[0105] (D) In ​​the image reading device described above, the control unit may also perform control as follows: detect the tilt of the first edge line based on the captured data, detect the tilt of the second edge line based on the captured data, and determine that the topmost original is a document bound together with other originals if the tilt of the first edge line exceeds a first threshold and the tilt of the second edge line is below a second threshold. Based on this structure, the control unit can determine with high accuracy whether the topmost original is a document bound together with other originals.

[0106] (E) The image reading device described above may also include a float sensor that detects the floatation of the topmost original being transported from the supply tray. The control unit performs the following control: when the float sensor detects the floatation of the topmost original, the conveyor roller is temporarily stopped; and after the conveyor roller is temporarily stopped, if it is determined that the topmost original is bound together with other originals, the conveyor roller is rotated to reverse the transport of the topmost original. After the topmost original is reversed, the conveyor roller and the separation roller are rotated to transport the topmost original without separating it from other originals. After the conveyor roller is temporarily stopped, if it is determined that the topmost original is not bound together with other originals, the rotation of the conveyor roller is restarted to transport the topmost original. If the top of the original is bound together with other originals, and the top original moves ahead of the others, it is prone to floating. That is, if the top of the original is bound together with other originals, the floating sensor can easily detect it. Because the top original is prone to floating ahead of the others, it is easily damaged. Therefore, according to the above structure, when the floating sensor detects the top original floating, the control unit temporarily stops the conveyor rollers. While the conveyor rollers are temporarily stopped, the control unit can determine whether the top original is bound together with other originals. This reduces the possibility of damage due to the top original moving ahead of the others.

[0107] (F) In the image reading device described above, the control unit may also perform the following control: acquiring image data obtained by photographing the topmost original (i.e., the first original) and the next original (i.e., the second original) among the plurality of originals; detecting the shadow located between the first original and the second original based on the image data; and determining, if the shadow is detected, that the first original is an original bound together with the second original. According to the above structure, the control unit can determine with high accuracy whether the first original is an original bound together with the second original.

[0108] (G) The image reading device described above may also include a camera unit located opposite the supply tray. The control unit performs control by acquiring image data obtained from the camera unit of the top original document and determining, based on the image data, whether the top original document is bound together with other original documents. According to this structure, the control unit can determine with high accuracy whether the top original document is bound together with other original documents based on the image data.

[0109] (H) The image reading device described above may also include: a first discharge path, which is a path through which the original document passing through the reading unit passes, and extends while curving; and a second discharge path, which is a path through which the original document passing through the reading unit passes, and extends in a straight line. The control unit performs control as follows: if it is determined that the topmost original document is not bound together with other original documents, it guides the topmost original document to be discharged through the first discharge path; and if it is determined that the topmost original document is bound together with other original documents, it guides the topmost original document to be discharged through the second discharge path. When the topmost original document bound together with other original documents is discharged through the first discharge path, the original document may become clogged because the first discharge path extends while curving. In this regard, according to the above structure, since the topmost original document bound together with other original documents is discharged through the second discharge path, the original document is easily and smoothly discharged. This reduces the possibility of a decrease in processing efficiency.

[0110] Symbol Explanation 11…Image reading device, 12…Conveying device, 13…Reading unit, 14…Housing, 15…Supply path, 16…First discharge path, 17…Second discharge path, 18…Supply tray, 19…Accumulation surface, 20…Baseline, 21…First discharge tray, 22…Second discharge tray, 23…Conveying unit, 24…Pick-up roller, 25…Conveying roller, 26…Separation roller, 27…Rotating roller, 28…Path switching mechanism, 29…Baffle 30… Displacement mechanism, 31… Lifting sensor, 32… Imaging unit, 33… Imaging section, 34… Support section, 35… Illumination unit, 36… Storage unit, 37… Control unit, D1… Imaging data, L1… First edge line, L2… Second edge line, M0… Original, M1… First original, M2… Second original, P1… Point, P2… Point, P3… Point, P4… Point, R0… Detection area, S0… Shadow, Y1… Conveying direction.

Claims

1. An image reading device, characterized in that, have: Paper trays, on which multiple originals are stacked; A conveyor roller that conveys the topmost original among the plurality of originals stacked on the supply tray; A separating roller, which is opposite the conveying roller, separates other originals from the topmost original; A reading unit that reads the topmost original document being conveyed from the supply tray; The control unit determines whether the topmost original being transported from the supply tray is an original that has been bound together with other originals. The control unit performs the following controls: If it is determined that the topmost original is bound together with other originals, the conveyor roller is rotated to reverse the direction of transport of the topmost original. After the topmost original has been reverse-transported, the conveying roller and the separating roller are rotated in a manner that conveys the topmost original without separating it from the other originals.

2. The image reading device as described in claim 1, characterized in that, have: The first discharge tray is the discharge destination of the uppermost original that has been conveyed by the conveyor rollers; The second discharge tray is the discharge destination for the uppermost original document, which has been conveyed by the conveyor rollers. The control unit performs the following controls: If it is determined that the topmost original is not bound together with other originals, the topmost original is ejected onto the first ejection tray, and If it is determined that the topmost original is bound together with other originals, the topmost original is discharged onto the second discharge tray.

3. The image reading device as described in claim 1, characterized in that, The control unit performs the following controls: The shooting data obtained from photographing the topmost original manuscript was acquired. The first edge line in the topmost original document is detected based on the captured data. Based on the captured data, the second edge line in the next original document following the topmost original document is detected, and The determination of whether the topmost original is bound together with other originals is based on the first edge line and the second edge line.

4. The image reading device as described in claim 3, characterized in that, The control unit performs the following controls: The tilt of the first edge line is detected based on the captured data. The tilt of the second edge line is detected based on the captured data, and If the inclination of the first edge line exceeds the first threshold and the inclination of the second edge line is below the second threshold, the topmost original is determined to be an original that has been bound together with other originals.

5. The image reading device as claimed in claim 1, characterized in that, It is equipped with a buoyancy sensor that detects the buoyancy of the topmost original being conveyed from the supply tray. The control unit performs the following controls: If the buoyancy sensor detects that the topmost original document has risen, the conveyor roller will be temporarily stopped. If, after temporarily stopping the conveyor rollers, it is determined that the topmost original is bound together with other originals, the conveyor rollers are rotated to reverse the direction of transporting the topmost original. After the topmost original has been reverse-fed, the conveying roller and the separating roller are rotated in a manner that allows the topmost original to be conveyed without separating it from other originals. If, after temporarily stopping the conveyor rollers, it is determined that the topmost original is not bound together with other originals, the rotation of the conveyor rollers is restarted in such a way that the topmost original is conveyed.

6. The image reading device as claimed in claim 1, characterized in that, The control unit performs the following controls: The shooting data is obtained by shooting the topmost original, i.e., the first original, and the next original, i.e., the second original, among the multiple originals. The shadow located between the first original and the second original is detected based on the captured data, and If the shadow is detected, it is determined that the first original is an original that has been bound together with the second original.

7. The image reading device according to any one of claims 1 to 6, characterized in that, It includes a camera unit, which is located opposite the supply tray. The control unit performs the following control: it obtains the shooting data obtained by shooting the top original from the shooting unit, and determines whether the top original is a copy that is bound together with other originals based on the shooting data.

8. The image reading device according to any one of claims 1 to 6, characterized in that, have: The first discharge path is a path for the original document that has passed through the reading section, and it extends while bending; The second discharge path is the path through which the original document that has passed through the reading section passes, and extends in a straight line. The control unit performs the following controls: If it is determined that the topmost original is not bound together with other originals, guidance is provided to eject the topmost original via the first ejection path. If it is determined that the topmost original is bound together with other originals, it is guided to discharge the topmost original via the second discharge path.

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