Manuscript reading apparatus

Abstract

To provide a manuscript reading apparatus capable of immediately recognizing defects in read image data.SOLUTION: A manuscript reading apparatus includes: a manuscript stand 10; a reading unit 11 that reads a manuscript placed on the manuscript stand 10; a manuscript size detection unit 12 that detects a size of the manuscript; a pressing plate 13 that opens and closes with respect to the manuscript stand; an angle detection unit 15 that detects an angle of the pressing plate 13 with respect to the manuscript stand 10; and a control unit 16 that, after reading the manuscript on the basis of the size of the manuscript detected by the manuscript size detection unit 12, moves the reading unit 11 out of a range of the size of the manuscript, controls the reading unit 11 to read the manuscript at a first time point when the angle detection unit 15 detects a first angle and a second time point when the angle detection unit detects a second angle larger than the first angle when the pressing plate 13 is opened, and determines erroneous detection of the size of the manuscript on the basis of first reading density at the first time point and second reading density at the second time point.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to an original reading apparatus and method for reading an original. [Background technology]

[0002] Conventionally, there is known a document reading device that is equipped in a scanner, a copier, a fax machine, a multifunction machine, etc., and optically reads a document placed on a document table. In this document reading device, if the size of the document to be read is misjudged, the document cannot be read accurately, and loss of image data from the scanned document occurs. Therefore, a document size detection mechanism that detects the size of the document is generally implemented.

[0003] For example, Patent Document 1 proposes a method for an original reading device that reads an original using a line sensor to accurately detect standard sizes by combining the original detection results from the line sensor and an original detection size sensor when the pressure plate that presses the original is in the open and closed states. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2006-135856 A Summary of the Invention [Problem to be solved by the invention]

[0005] When an original is placed on the platen and read, defects may occur in the read image data in the following cases. 1. When the size of the document is automatically detected, a non-standard document size is mistakenly detected as a standard size. 2. If the document size is manually set, the setting is incorrect. 3. The manual setting for the document size is correct, but the document is placed in the wrong place

[0006] In Patent Document 1, the size of a standard-sized document can be accurately detected, but the length of a document cannot be accurately detected for documents of other sizes because the detection of the document length is performed using a single document detection size sensor. For example, a size such as AB size (210 mm x 257 mm), which is a non-standard size used in textbooks, is likely to be erroneously detected as B5 size (182 mm x 257 mm) in the automatic detection of Case 1 described above, in which case image data in the length direction is missing from 182 mm to 210 mm. Even with manual setting of Case 2, if the paper size of the textbook is not known, the wrong size may be set.

[0007] The user cannot notice the loss of image data until he or she checks the print result or display result of the image data, which leads to a decrease in work efficiency.

[0008] SUMMARY OF THE PRESENT DISCLOSURE In view of the above circumstances, an object of the present invention is to provide an original reading device that is capable of immediately recognizing defects in read image data. [Means for solving the problem]

[0009] The document reading device of the present invention includes a document table on which a document to be read is placed, a reading unit that reads the document placed on the document table, a document size detection unit that detects the size of the document placed on the document table, a pressure plate that presses the document placed on the document table and rotates around one side as a central axis to open and close relative to the document table, and an angle detection unit that detects the angle of the pressure plate relative to the document placement surface of the document table.The document reading device controls the reading unit to read the document based on the size of the document detected by the document size detection unit, and then moves the reading unit out of the range of document sizes.When the pressure plate is opened, the reading unit is controlled to read the document at a first point in time when a first angle is detected by the angle detection unit and a second point in time when a second angle greater than the first angle is detected, and a control unit that determines whether the document size has been detected erroneously based on the first reading density at the first point in time and the second reading density at the second point in time. Effect of the Invention

[0010] According to the document reading device of the present invention, the size of the document placed on the document table is detected, the document is read based on the detected document size, and then the reading unit is moved outside the range of document sizes. When the pressure plate is opened, reading is performed at a first point in time when the angle of the pressure plate relative to the document placement surface becomes a first angle, and at a second point in time when the angle becomes a second angle larger than the first angle. Misdetection of the document size is determined based on the first reading density at the first point in time and the second reading density at the second point in time, so that the user can immediately recognize any loss in the read image data. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a block diagram showing a configuration of an inkjet printing system using an embodiment of a document reading device of the present invention. [Diagram 2] FIG. 1 is a schematic diagram showing a schematic configuration of an embodiment of a document reading device of the present invention; [Diagram 3] Top view of the document table and scanning unit [Figure 4] FIG. 1 is a diagram for explaining a configuration of an angle detection unit and a first angle and a second angle; [Diagram 5] A flowchart for explaining a process flow of an embodiment of the document reading device of the present invention. [Figure 6] Flowchart for explaining the flow of reread processing [Figure 7] FIG. 13 is a diagram showing an example of a document size input screen. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] An inkjet printing system using an embodiment of a document reading device of the present invention will be described in detail below with reference to the drawings. Fig. 1 is a block diagram showing a schematic configuration of an inkjet printing system 1 of this embodiment.

[0013] The inkjet printing system 1 of this embodiment includes a document reading device 2 and a printing device 3. In the inkjet printing system 1 of this embodiment, the document reading device 2 reads a document to be read, and the read image data is input to the printing device 3. The printing device 3 performs a printing process on a printing medium based on the input image data.

[0014] First, a detailed description will be given of the document reading device 2. Fig. 2 is a schematic diagram showing a schematic configuration of the document reading device 2 of this embodiment.

[0015] As shown in Fig. 2, the document reading device 2 of this embodiment includes a document table 10, a reading unit 11, a document size detection unit 12, a pressure plate 13, an angle detection unit 15, and a control unit 16. Fig. 3 is a view of the document table 10 and the reading unit 11 as viewed from above. The front, back, left and right directions shown in Fig. 3 are the front, back, left and right directions of the document reading device 2.

[0016] The document table 10 has a platen glass 10a made of a transparent glass plate, and the document to be read is placed on the platen glass 10a. The surface of the platen glass 10a is the document placement surface.

[0017] The reading unit 11 reads the document placed on the document table 10. The reading unit 11 is disposed below the platen glass 10a of the document table 10.

[0018] The reading unit 11 extends in the X direction (main scanning direction) shown in Fig. 3. The reading unit 11 includes a line sensor 11a, a reading light source 11b, and a carriage 11c.

[0019] The line sensor 11a is configured by arranging imaging elements such as CCDs (Charge Coupled Devices) in a line in the X direction.

[0020] The reading light source 11b emits reading light toward the original P placed on the original table 10. The reading light source 11b is a light emitting element such as LEDs (light emitting diodes) arranged in a line in the X direction. In this embodiment, the reading light sources 11b are provided on both sides of the line sensor 11a in the Y direction (sub-scanning direction) and parallel to the line sensor 11a.

[0021] The carriage 11c is equipped with the line sensor 11a and the reading light source 11b described above. The reading unit 11 is provided with a drive motor 11d (see FIG. 2) that moves the carriage 11c in the Y direction.

[0022] Before reading the original P, the carriage 11c is located at a home position indicated by a dotted line in Fig. 3. When detecting the size of the original, which will be described later, the carriage 11c moves to a document size detection position indicated by a solid line in Fig. 2. When reading the original P, the carriage 11c returns to the home position again and then moves in the Y direction. In the following description, the movement of the carriage 11c may be referred to as the movement of the reading unit 11.

[0023] The reading unit 11 irradiates a document P placed on the document table 10 with reading light, and receives the reflected light by a line sensor 11 a to read the document P. The reading unit 11 outputs the read image data to the control unit 16 .

[0024] The document size detection unit 12 detects the size of the document P (hereinafter simply referred to as the document size) set on the document table 10. The document size detection unit 12 includes a document length detection sensor 12a shown in FIG.

[0025] The document length detection sensor 12a is fixedly installed near the center of the platen glass 10a in the Y direction, and includes a light-emitting section 12b that emits detection light toward the platen glass 10a, and a light-receiving section 12c that receives the detection light reflected from the document P placed on the platen glass 10a.

[0026] The document size detection unit 12 detects the size of the document P placed on the document table 10 based on the state of reception of reflected light by the document length detection sensor 12a and the detection signal of the line sensor 11a arranged at the document size detection position. A specific method of detecting the document size will be described in detail later.

[0027] The pressing plate 13 presses the original P placed on the original table 10, and rotates about one side of the pressing plate 13 as a central axis to open and close with respect to the original table 10. The surface of the pressing plate 13 that presses the original P is white or a color close to white.

[0028] The angle detection unit 15 detects the angle of the pressure plate 13 with respect to the document placement surface of the document table 10. The angle detection unit 15 is provided near the connection point between the document reading device 2 main body and the pressure plate 13, and detects whether or not the pressure plate 13 has reached a predetermined angle with respect to the document placement surface.

[0029] 4A is a diagram showing a specific configuration of the angle detection unit 15. The angle detection unit 15 is provided with optical sensors 15a and 15b and a sensor flag 15c, which are installed in the document reading device 2 near a support shaft (central shaft) for opening and closing the pressing plate 13.

[0030] The angle detection unit 15 is a mechanism for detecting two-stage open angles (a first angle θ1 and a second angle θ2) of the pressure plate 13, and detects the open angle of the pressure plate 13 by blocking the light of the optical sensors 15a and 15b by the sensor flag 15c that moves up and down in conjunction with the opening and closing of the pressure plate 13. Note that in this embodiment, the optical sensors 15a and 15b are used as the sensors, but the present invention is not limited to this, and it is sufficient to detect the position of the sensor flag 15c that moves in conjunction with the pressure plate 13. For example, a photocoupler, which is a similar light-electricity conversion means, may be used, or, for example, a magnet may be provided on the sensor flag 15c, and the state of the sensor flag 15c may be detected by detecting the magnet with a magnetic sensor.

[0031] Next, the first angle θ1 and the second angle θ2 detected by the angle detection unit 15 will be described in detail with reference to Fig. 4B. Fig. 4B is a side cross-sectional view of the pressing plate 13 and the manuscript table 10.

[0032] In the open state, the pressure plate 13 is in the open position shown by the solid line in Fig. 4B, and in the closed state, the pressure plate 13 is in the closed position shown by the two-dot chain line.

[0033] The second angle θ2 is the position of the pressure plate 13 shown by the dashed line in FIG. 4B, and the second angle θ2 is smaller than the angle between the pressure plate 13 and the platen 10 in the open position.

[0034] The first angle θ1 is the position of the pressing plate 13 shown by the dashed line in Fig. 4B. The first angle θ1 is smaller than the second angle θ2.

[0035] The angle detection unit 15 detects when the pressing plate 13 is at the first angle θ1 and when the pressing plate 13 is at the second angle θ2 when the pressing plate 13 is opened or closed. The detection result by the angle detection unit 15 is output to the control unit 16.

[0036] The control unit 16 controls the entire document reading device 2. Specifically, the control unit 16 in this embodiment controls the drive motor 11d to control the movement of the carriage 11c of the reading unit 11. The control unit 16 also controls the reading unit 11 to emit reading light from the reading light source 11b, detect the reflected light by the line sensor 11a, and obtain a detection signal. Then, the control unit 16 generates image data representing the document based on the detection signal.

[0037] Furthermore, the control unit 16 determines whether the pressing plate 13 is open or closed based on the detection result of the angle detection unit 15. Specifically, when the angle detection unit 15 detects a first angle θ1 and then a second angle θ2, it determines that the pressing plate 13 is in the open state, and when the angle detection unit 15 detects the first angle θ1 and then the second angle θ2, it determines that the pressing plate 13 is in the closed state.

[0038] The control unit 16 also determines whether the document size of the document placed on the document table 10 has been erroneously detected. Specifically, the control unit 16 determines whether the document size has been erroneously detected when the document size detected by the document size detection unit 12 is smaller than the actual document size of the document. Specifically, the control unit 16 controls the reading unit 11 to read the document based on the document size detected by the document size detection unit 12, and then moves the reading unit 11 out of the range of the document size. Then, the control unit 16 controls the reading unit 11 to read the document at a first time point when the first angle θ1 is detected by the angle detection unit 15 and at a second time point when the second angle θ2 is detected, and determines whether the document size has been erroneously detected based on the first reading density at the first time point and the second reading density at the second time point. The method of determining whether the document size has been erroneously detected will be described in detail later.

[0039] Furthermore, when the control unit 16 determines that the document size detected by the document size detection unit 12 is an erroneous detection, it displays a warning on the display unit 31 of the printing device 3.

[0040] Furthermore, when the control unit 16 determines that the document size has been erroneously detected, it accepts the document size input by the user and controls the reading unit 11 to re-read the document based on the accepted document size. Note that the acceptance of the document size input by the user and the re-reading process will be described in detail later.

[0041] The control unit 16 includes a CPU (Central Processing Unit), a semiconductor memory, etc. The control unit 16 executes a control program stored in advance in a storage medium such as the semiconductor memory or a hard disk, and controls each process of the document reading device 2 by operating an electric circuit.

[0042] The control unit 16 may be common to the control unit 32 of the printing device 3, or may be provided separately as in this embodiment, with the control unit 16 of the document reading device 2 and the control unit 32 of the printing device 3 working together to perform each process.

[0043] Next, the flow of processing performed by the document reading device 2 of this embodiment will be described with reference to the flowchart shown in FIG.

[0044] First, the control unit 16 monitors whether the pressing plate 13 is closed (S10), and if the pressing plate 13 is closed (S10, YES), performs a process of detecting the document size (S12).

[0045] Specifically, the control unit 16 controls the drive motor 11d to move the reading unit 11 to the document size detection position. Then, the control unit 16 controls the reading light source 11b and the line sensor 11a of the reading unit 11 to perform a reading operation. A detection signal detected by the line sensor 11a during this reading operation is acquired by the document size detection unit 12.

[0046] Then, document size detection unit 12 calculates the width of the document placed on document table 10 based on the detection signal from line sensor 11a. Control unit 16 also operates document length detection sensor 12a. Then, document size detection unit 12 acquires the light receiving state (ON when light is being received, OFF when light is not being received) of light receiving unit 12c of document length detection sensor 12a.

[0047] The document size detection unit 12 detects the document size by referring to the table shown in Table 1 below based on the document width detected based on the detection signal of the line sensor 11a and the light receiving state (ON or OFF) of the document length detection sensor 12a. [Table 1] In this example, the document length detection sensor 12a is disposed at a position that turns OFF at 210 mm and turns ON at 257 mm, and is disposed 220 mm to 240 mm from the origin in the sub-scanning direction.

[0048] For example, when the width of the document is 165 mm or more and less than 196 mm and the light receiving state of the document length detection sensor 12a is ON, the document size detection unit 12 detects the document size as B5 portrait. Note that even if the width of the document is 165 mm or more and less than 196 mm, when the light receiving state of the document length detection sensor 12a is OFF, the document size detection unit 12 determines that there is no document size that corresponds to the width of the document.

[0049] Furthermore, when the width of the document is 196 mm or more and less than 233.5 mm, if the light receiving state of the document length detection sensor 12a is ON, the document size detection unit 12 detects the document size as A4 portrait, and if the light receiving state of the document length detection sensor 12a is OFF, the document size detection unit 12 detects the document size as A5 landscape. Note that if the width of the document is less than 38 mm, the document size detection unit 12 determines that there is no document, regardless of the light receiving state of the document length detection sensor 12a.

[0050] For example, if the document size is AB landscape (257 mm x 210 mm), when the width of the document is between 233.5 mm and 277 mm, the document length detection sensor 12a will be turned OFF, and the document will be detected as B5 landscape (257 mm x 182 mm), and the image data in the lengthwise direction will be missing from 182 mm to 210 mm.

[0051] In addition, if an AB size double-page spread (257mm x 420mm) is used as the document size, when the width of the document is between 233.5mm and 277mm, the document length detection sensor 12a will be ON, and the document will be detected as B4 portrait (257mm x 364mm), and the image data from 364mm to 420mm in the length direction will be missing.

[0052] After the detection of the document size is completed, the control unit 16 monitors whether or not a read instruction from the user has been received (S14), and if a read instruction has been received (S14, YES), the control unit 16 returns the reading unit 11 to the home position and moves the reading unit 11 in the Y direction to perform actual reading of the document P (S16). The read instruction is received, for example, by the display unit 31 of the printing device 3.

[0053] During the actual reading, the control unit 16 moves the reading unit 11 from the home position to a position corresponding to the length of the document size detected by the document size detection unit 12. That is, the control unit 16 moves the reading unit 11 from left to right within the range of the document size detected by the document size detection unit 12 to perform the actual reading.

[0054] Next, after the main reading of the document is completed, the control unit 16 moves the reading unit 11 further in the Y direction (right side) to a preset position outside the range of the document size detected by the document size detection unit 12 and makes the reading unit wait (S18). The position outside the range of the document size is preferably a position about 2 mm to 3 mm to the right from the range of the document size.

[0055] Then, after the main reading of the document is completed, if the user opens the pressure plate 13 to remove the document (S20, YES), the control unit 16 controls the reading unit 11 to perform reading to determine whether the document size has been detected erroneously at a first point in time when the angle of the pressure plate 13 detected by the angle detection unit 15 becomes the first angle θ1 and at a second point in time when the angle becomes the second angle θ2 (S22).

[0056] The control unit 16 acquires a detection signal detected by the line sensor 11a of the reading unit 11 at a first time point, calculates a first reading density based on the detection signal, and acquires a detection signal detected by the line sensor 11a of the reading unit 11 at a second time point, and calculates a second reading density based on the detection signal.

[0057] Next, the control unit 16 determines whether or not a part of the document is present on the reading unit 11 based on the first reading density and the second reading density (S24), and thereby determines whether the document size has been erroneously detected. Specifically, if there is no difference between the first reading density and the second reading density, the control unit 16 determines that a part of the document is present on the reading unit 11 (S24, YES), and determines that the document size detected by the document size detection unit 12 has been erroneously detected (S26). If the document size has been erroneously detected, the control unit 16 outputs a control signal to the control unit 32 of the printing device 3, and causes the display unit 31 to display a warning (S28).

[0058] Here, when there is no difference between the first reading density and the second reading density, this means that since part of the document is present on the reading unit 11, even if the pressure plate 13 is opened, part of the document is read by the reading unit 11, and regardless of the opening angle of the pressure plate 13, the first reading density and the second reading density become the reading density of the document itself, and there is no difference between them.

[0059] On the other hand, when there is no original on the reading unit 11 and the pressure plate 13 is opened, the space where no original is present is read by the reading unit 11, and the distance between the reading unit 11 and the pressure plate 13 changes depending on the opening angle of the pressure plate 13 (first angle θ1 and second angle θ2), so that the brightness of the reflected light received by the reading unit 11 changes, resulting in a difference between the first reading density and the second reading density.

[0060] Therefore, if there is a difference between the first reading density and the second reading density, the control unit 16 determines that no part of the document is present on the reading unit 11 (S24, NO), determines that the document size detected by the document size detection unit 12 is not an erroneous detection, and terminates the processing.

[0061] It is preferable that the first angle θ1 and the second angle θ2 are angles that enable the difference between the first read density and the second read density to be recognized when no document is present on the reading unit 11. For example, it is preferable that the first angle θ1 is approximately 5 degrees, the second angle θ2 is approximately 15 degrees, and the difference between the first angle θ1 and the second angle θ2 is approximately 10 degrees.

[0062] In addition, in the document reading device 2 of the above embodiment, if it is determined that the document size detected by the document size detection unit 12 is an erroneous detection, the document may be re-read. Hereinafter, the document re-reading process will be described with reference to the flowchart shown in FIG.

[0063] First, when the control unit 16 determines that the document size is erroneously detected, it displays a document size input screen that accepts input of the document size by the user (S30). Fig. 7 is a diagram showing an example of the document size input screen. The user inputs the width of the document size in the "Width" setting input box B1 of "Size input" on the document size input screen, and inputs the length of the document size in the "Length" setting input box B2 (S32).

[0064] Next, when the user selects the "size confirmation" button on the document size input screen (S34, YES), the control unit 16 moves the reading unit 11 to the position of the length of the document size input in the "length" setting input box B2 (S36). Then, the control unit 16 moves the reading unit 11 to the position of the length of the document size, and then emits reading light from the reading light source 11b of the reading unit 11 to turn it on (S38). By turning on the reading light source 11b, the user can check the position of the reading unit 11, and can visually check whether the length set and input on the document size input screen is correct. If the length set and input on the document size input screen is incorrect, the user may set and input the length of the document size again in the "length" setting input box B2 and turn on the reading light source 11b again.

[0065] Then, after the control unit 16 has confirmed whether the length of the document size set and input by the user is correct as described above, or if "check size" is not selected (S34, NO) and "re-read" is selected on the document size input screen (S40, re-read), the control unit 16 performs re-reading (S42). Specifically, the control unit 16 moves the reading unit 11 to the home position, and then moves the reading unit 11 from the home position to a position corresponding to the length of the document size set and input by the user, thereby performing re-reading. Note that, when re-reading, a message urging the user to close the pressing plate 13 may be displayed.

[0066] On the other hand, if "Cancel" is selected on the document size input screen (S40, Cancel), the reading of the document itself is cancelled (S44). Also, if "Continue" is selected on the document size input screen (S40, Continue), the read image data is confirmed without re-reading and the process proceeds to the next step (S46). This is the case when the user does not care if there is a missing image. If the process proceeds to the next step, the process returns to normal when no warning is issued, and although not shown, it is possible to execute instructions such as reading the next page and printing. Also, if there is no particular operation (S40, no operation), the process returns to S32 and size input is possible.

[0067] 1, the printing device 3 will be described. The printing device 3 includes a print processing unit 30, a display unit 31, and a control unit 32.

[0068] The print processing unit 30 performs a print process on a print medium based on the image data output from the document reading device 2. In this embodiment, the print processing unit 30 performs a print process by an inkjet printing method, but the printing method is not limited to this, and may be a laser printing method or a stencil printing method.

[0069] The display unit 31 is configured with a touch panel, and accepts various instruction inputs from the user, such as a read instruction or a print instruction, and also displays various information such as the above-mentioned warnings.

[0070] The control unit 32 includes a CPU, a semiconductor memory, and the like, and controls the printing device 3 as a whole.

[0071] According to the inkjet printing system 1 of the embodiment, the size of the document placed on the document table 10 is detected, the document is read based on the detected size, the reading unit 11 is moved out of the range of the document size, and when the pressure plate 13 is opened, reading is performed at a first time when the angle of the pressure plate 13 with respect to the document placement surface becomes a first angle θ1 and at a second time when the angle becomes a second angle θ2, and erroneous detection of the document size is determined based on the first reading density at the first time and the second reading density at the second time, so that the user can immediately recognize the loss of the read image data. This is particularly effective when reading a book with multiple pages and an irregular size.

[0072] Furthermore, in the inkjet printing system 1 of the above embodiment, when there is no difference between the first reading density and the second reading density, that is, even though the reading unit 11 is outside the range of the document size, the presence of the document is detected and it is determined that the document size has been erroneously detected, so that erroneous detection of the document size can be determined by a simple comparison process.

[0073] Furthermore, in the inkjet printing system 1 of the above embodiment, if it is determined that the document size has been misdetected, a warning is issued, so that the user can immediately recognize the misdetection of the document size and take appropriate action, such as re-reading the document.

[0074] Furthermore, in the inkjet printing system 1 of the above embodiment, if it is determined that the size of the original document has been erroneously detected, input of the size of the original document by the user is accepted, and re-reading is performed based on the accepted size of the original document, so that the user can immediately perform re-reading.

[0075] Furthermore, in the inkjet printing system 1 of the above embodiment, the reading unit 11 is moved to the end of the document size input by the user (the position of the length of the document size) and then reading light is emitted from the reading unit 11, so that the user can immediately know whether the document size he or she input is correct or not.

[0076] Furthermore, the present invention is not limited to the above-described embodiment, and the components can be modified and embodied in the implementation stage without departing from the gist of the invention. Furthermore, various inventions can be formed by appropriately combining the multiple components disclosed in the above-described embodiment. For example, all the components shown in the embodiment may be appropriately combined. Of course, various modifications and applications are possible without departing from the spirit of the invention.

[0077] The present invention further discloses the following supplementary notes.

[0078] (Appendix 1) The document reading device of the present invention includes a document table on which a document to be read is placed, a reading unit that reads the document placed on the document table, a document size detection unit that detects the size of the document placed on the document table, a pressure plate that presses the document placed on the document table and rotates around one side as a central axis to open and close relative to the document table, and an angle detection unit that detects the angle of the pressure plate relative to the document placement surface of the document table.The document reading device controls the reading unit to read the document based on the size of the document detected by the document size detection unit, and then moves the reading unit out of the range of document sizes.When the pressure plate is opened, the reading unit is controlled to read the document at a first point in time when a first angle is detected by the angle detection unit and a second point in time when a second angle greater than the first angle is detected, and a control unit that determines whether the document size has been detected erroneously based on the first reading density at the first point in time and the second reading density at the second point in time.

[0079] (Appendix 2) In the document reading device according to supplementary note 1, the control unit can determine that the document size has been erroneously detected when there is no difference between the first reading density and the second reading density.

[0080] (Appendix 3) In the document reading device according to Supplementary Note 1 or 2, the control unit can issue a warning when it is determined that the size of the document has been erroneously detected.

[0081] (Appendix 4) In the document reading device described in any one of Supplementary Notes 1 to 3, when the control unit determines that the document size has been erroneously detected, it can accept input of the document size by the user and control the reading unit to re-read the document based on the accepted document size.

[0082] (Appendix 5) In the document reading device described in Supplementary Note 4, the control unit can move the reading unit to an end of the document size input by the user, and then cause the reading unit to emit reading light.

[0083] (Appendix 6) The document reading method of the present invention is a document reading method in which a document to be read, which is placed on a document table, is pressed with a pressure plate and then the document is read by a reading unit, the size of the document placed on the document table is detected, the document is read based on the detected size of the document, and the reading unit is moved outside the range of the document size.When the pressure plate is opened, reading is performed by the reading unit at a first point in time when the angle of the pressure plate relative to the document placement surface of the document table becomes a first angle and at a second point in time when the angle becomes a second angle larger than the first angle, and erroneous detection of the document size is determined based on the first reading density at the first point in time and the second reading density at the second point in time. [Explanation of symbols]

[0084] 1. Inkjet Printing System 2 Document reader 3 Printing device 10 Document stand 10a Platen glass 11 Reading unit 11a Line sensor 11b Reading light source 11c Carriage 11d Drive motor 12 Document size detection section 12a Document length detection sensor 12b Light emitting part 12c Light receiving part 13 Pressure plate 15 Angle detection unit 15a, 15b Optical sensor 15c Sensor Flag 16 Control section 30 Print processing unit 31 displays 31 Display section 32 Control section B1 Setting input box B2 Setting input box P Manuscript θ1 First angle θ2 Second angle

Claims

1. a document table on which a document to be read is placed; a reading unit that reads a document placed on the document table; a document size detection unit for detecting a size of a document placed on the document table; a pressing plate that presses the document placed on the document table and rotates about one side of the pressing plate to open and close the document table; an angle detection unit that detects an angle of the pressing plate with respect to a document placement surface of the document table; a control unit that controls the reading unit to read the document based on the size of the document detected by the document size detection unit, and then moves the reading unit out of the range of the document size, and when the pressure plate is opened, controls the reading unit to read at a first point in time when a first angle is detected by the angle detection unit and a second point in time when a second angle larger than the first angle is detected, and determines whether the size of the document has been detected erroneously based on a first reading density at the first point in time and a second reading density at the second point in time.

2. 2. The document reading device according to claim 1, wherein the control unit determines that the size of the document has been erroneously detected when there is no difference between the first read density and the second read density.

3. 2. The document reading device according to claim 1, wherein the control unit issues a warning when it determines that the size of the document has been erroneously detected.

4. 2. The document reading device according to claim 1, wherein when the control unit determines that the size of the document has been erroneously detected, the control unit accepts input of the size of the document by a user, and controls the reading unit to re-read the document based on the accepted size of the document.

5. 5. The document reading device according to claim 4, wherein the control unit moves the reading unit to an end of the document size input by the user, and then causes the reading unit to emit reading light.

6. A document reading method for reading a document to be read by a reading unit after pressing a document to be read that is placed on a document table with a pressing plate, comprising: Detecting the size of the document placed on the document table; After reading the document based on the detected size of the document, the reading unit is moved outside the range of the size of the document; When the pressing plate is opened, reading is performed by the reading unit at a first time point when an angle of the pressing plate with respect to a document placement surface of the document table becomes a first angle and at a second time point when the angle becomes a second angle larger than the first angle; The document reading method further comprises determining whether or not a size of the document has been erroneously detected based on a first read density at the first time point and a second read density at the second time point.

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