JP2017055341A - Image reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image reader that facilitates processing in which ejected documents are caused to sequentially face documents ejected in another processing, even in processing in which both sides of one document are read.SOLUTION: An image reader 400 comprises: a document tray 30; rollers 1 to 3 that carry a document to a reading position; an inverting path 8 that inverts the document passed through the reading position, back to front; a scanner unit 208 that reads the surface of the document or the back thereof after the inversion; a sheet ejection roller 5 that ejects onto a sheet ejection tray the document whose surface or back after the inversion is read; a CPU 1701 that ejects the document whose back has been read, in a first mode in which the document is ejected after inverted, or in a second mode in which the document is ejected without inverted; and a sensor 13 that detects a document on the sheet ejection tray 31. In a job for reading the surface and back of one document, the control means ejects the document in the second mode if there is no documents on the sheet ejection tray and ejects the document in the first mode if there are documents on the sheet ejection tray.SELECTED DRAWING: Figure 3B

Description

  The present invention relates to an image reading apparatus capable of reading images on both sides by inverting a document.

  2. Description of the Related Art In recent years, even image forming apparatuses such as copying machines and facsimiles used in small offices and general homes include an image reading apparatus having an automatic document feeder (ADF). . The ADF separates documents one by one from a bundle of documents composed of a plurality of documents, conveys them to a reading position, and discharges them to a predetermined discharge position after the reading of the original by the reading means is completed at the reading position.

  An ADF attached to a relatively low-cost image reading apparatus includes, for example, an apparatus having a configuration in which the front and back of a document are reversed in the ADF in order to read both sides of the document. Thereby, even an apparatus including one reading unit can read images on both the front and back sides of the document. In such an ADF, usually, when a document after reading is discharged, the front and back sides are reversed again without discharging the original when the back side is read so that the surface order of the document on the discharge tray is correct. The paper is then discharged to the paper output tray.

  By the way, in a relatively low-cost image reading apparatus, the document conveying speed in the ADF tends to be lower than that of a high-cost apparatus. Therefore, when there is a single document, even if the front and back sides of the document are reversed, it is assumed that the orientation of the document surface will be corrected by the user when the document is removed from the paper discharge tray. A technique for omitting the inversion process has been proposed (for example, Patent Document 1). This shortens the time from the start of document reading to the completion of discharge.

JP 2001-350298 A

  However, if the double-sided scanning job for a single document is uniformly omitted, the front and back sides of the paper output side are reversed for a single-sided double-sided scanning job when multiple jobs are executed continuously. This is contrary to the case of the original document job, and the surface order of the discharged original document may not match. For example, when only the third of five double-sided originals is copied to colored paper, job A for copying the first and second originals to white paper, job B for copying the third original to colored paper, 4 , Suppose that job C for copying the fifth original on a blank sheet is continuously performed. When the originals of each job are collectively taken out from the paper discharge tray after job C is completed, the originals of jobs A and C are in the same order, but the originals of job B are in reverse order. Of the five originals, it is necessary to correct the surface order of the third original. Such a situation may occur when a plurality of copy jobs or image transmission jobs are continuously performed and jobs for performing double-sided scanning of a single document are mixed. In such a case, since the discharge surfaces of the original bundle on the discharge tray are scattered, there is a problem that even if the originals can be discharged quickly, the subsequent work for adjusting the surface order by the user becomes complicated.

  According to the present invention, even in the case of double-sided reading processing of a single document using an apparatus including a front / back re-inversion unit for adjusting the surface order of the discharged document, the sheet is discharged by other processing on the document after the reading processing. It is an object of the present invention to provide an image reading apparatus that can easily perform surface alignment processing with a prepared document.

  In order to solve the above problem, the document reading apparatus according to claim 1 is a document tray, a transport unit that transports a document placed on the document tray to a reading position, and a document transported to the reading position. Reading means for reading the front or back image, reversing means for reversing the front and back of the document on which the front image is read by the reading means, and a document on which the back or front / back reverse image is read by the reading means A paper discharge means for discharging the paper onto a paper discharge tray, and a surface alignment means for reversing the front and back of the document before it is discharged to the paper discharge tray with respect to the document on which the image on the back side is read. And a detecting means for detecting the presence or absence of a document on the paper discharge tray, and the document discharged on the paper discharge tray is a single document in which front and back images are read. For ordering Control means for controlling the re-inversion processing to be omitted, and when the detection means determines that there is a document on the paper discharge tray, the control means performs the re-reversal processing by the surface alignment means. Control is performed so that the inversion process is executed without being omitted.

  According to the present invention, when there is an original on the paper discharge tray, even when performing double-sided reading processing of a single original, control is performed so as not to omit the front / back reinversion processing for aligning the paper discharge surfaces. To do. As a result, the front and back of the paper discharge surface can be matched with the case where another document reading process is performed. Therefore, even in the case of double-sided reading processing of a single document using an apparatus having front and back re-inversion means for aligning the discharge surface, the surface of the original after discharge processing and the original discharged by other reading processing Ordering is easy.

1 is a cross-sectional view illustrating a schematic configuration of an image reading apparatus according to an embodiment. FIG. 2 is a block diagram illustrating a control configuration of the image reading apparatus in FIG. 1. 3 is a flowchart showing a procedure of first image reading processing using the image reading apparatus of FIG. 1. 3 is a flowchart showing a procedure of first image reading processing using the image reading apparatus of FIG. 1. It is a figure for demonstrating the single-sided reading process using ADF. It is a figure for demonstrating the double-sided reading process using ADF. It is a figure for demonstrating the double-sided reading process using ADF. It is a figure for demonstrating the double-sided reading process using ADF. FIG. 6 is a diagram for explaining a relationship between a document surface on a document tray and a document surface on a paper discharge tray. FIG. 6 is a diagram for explaining a relationship between a document surface on a document tray and a document surface on a paper discharge tray. FIG. 5 is a diagram for explaining omission of a surface ordering process in a double-sided reading process for a single document. FIG. 6 is a diagram for explaining the orientation of a document on a paper discharge tray when a plurality of document reading processes are continuously executed. It is a flowchart which shows the procedure of a 2nd image reading process. It is a flowchart which shows the procedure of a 2nd image reading process. 10 is a flowchart illustrating a procedure of third image reading processing. 10 is a flowchart illustrating a procedure of third image reading processing. It is a figure which shows an example of a warning screen.

  Hereinafter, embodiments will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view illustrating a schematic configuration of an image reading apparatus according to an embodiment.

  1, an image reading apparatus 400 includes an image reading apparatus main body (hereinafter referred to as “reader”) 200, an automatic document feeder (hereinafter referred to as “ADF”) 100 mounted on the reader 200, and the like. And a controller 300 (not shown).

  The ADF 100 includes a document tray 30, a document presence / absence sensor 12 provided at an end of a document placement surface of the document tray 30, a sheet feed roller 1 provided above the curved sheet, a curved conveyance path 10 serving as a conveyance path, And a document discharge tray 31. A document bundle S is set on the document tray 30. The document presence / absence sensor 12 detects the presence / absence of a document on the document tray 30.

  A separation roller 2 and a separation pad 7 are provided at the entrance of the conveyance path 10. The separation roller 2 and the separation pad 7 separate the originals one by one from the uppermost part of the original bundle S delivered by the paper feed roller 1. A transport roller 3, a document edge sensor 11, a reading guide plate 4, and a paper discharge roller 5 are provided on the downstream side of the separation roller 2 in the transport path 10. The transport path 10 is provided with a reverse path 8 that connects the upstream side of the paper discharge roller 5 of the transport path 10 and the upstream side of the document edge sensor 11. A reverse flapper 6 is disposed at a branch point between the conveyance path 10 and the reverse path 8 on the upstream side of the paper discharge roller 5.

  The reader 200 disposed below the ADF 100 includes a document table glass 201 that faces the reading guide plate 4 of the ADF 100. The document table glass 201 is provided with a reference white plate 219. A scanner unit 208 is movably provided at a position facing the reading guide plate 4 with the document table glass 201 interposed therebetween. The scanner unit 208 includes an LED 203 as a light source, a lens 204, and an image sensor 205.

  A home position (HP) detection flag 207 is provided below the scanner unit 208, and a home position (HP) detection sensor 206 is disposed on the bottom plate of the reader 200 so as to face the HP detection flag 207. The HP detection flag 207 and the HP sensor 206 are used for positioning the scanner unit 208.

  FIG. 2 is a block diagram showing a control configuration of the image reading apparatus 400 of FIG.

  In FIG. 2, the image reading apparatus 400 includes a reading CPU 1701 that controls the reader 200 and the ADF 100, and a controller CPU 1751.

  The reading CPU 1701 is connected to a reading RAM 1702, a reading ROM 1703, a document conveying unit 1704, a scanner unit driving unit 1705, an image reading unit 1706, an image processing unit 1707, and a controller communication unit 1708. The controller CPU 1751 is connected to a controller RAM 1752, a controller ROM 1753, an operation unit 1754, an image memory 1755, an image forming unit 1756, a document reading unit communication unit 1757, and an external I / F 1758, respectively. Further, the controller communication unit 1708 and the document reading unit communication unit 1757 are connected so as to communicate with each other.

  The reading ROM 1703 is a reading storage unit that stores control contents to be executed by the reading CPU 1701. The reading RAM 1702 is a storage unit used as a work area necessary for the reading CPU 1701 to control the entire image reading apparatus 400. The reading RAM 1702 functions as a work area of the reading CPU 1701 and also until the image processing unit 1707 transmits image data for processing such as shading and the image read by the image reading unit 1706 to the controller. Used as a temporary storage area.

  The document transport unit 1704 transports the document placed on the ADF 100 to the image reading position of the scanner unit 208 and discharges the document after reading, and controls the ADF motor, the document edge sensor 11, the document presence / absence sensor 12, and the like. To do. The scanner unit driving unit 1705 uses the detection result of the HP sensor 206 to move the scanner unit 208 to a position facing the reading guide plate 4 directly below the platen glass 201 in accordance with the contents of the job.

  An image reading unit 1706 controls the LED 203, the lens 204, and the image sensor 205 included in the scanner unit 208 to read an image in a desired operation mode. The image processing unit 1707 rearranges image data and erases unnecessary image areas read by the image reading unit 1706 so that the controller can correctly receive the image data. Further, the image processing unit 1707 processes the image data into an appropriate form, and then transfers the image data to the controller via the controller communication unit 1708. The controller communication unit 1708 receives the content of the job instructed by the controller as the image reading device 400 and returns the image data to the controller.

  The controller CPU 1751 also controls an image forming apparatus (not shown) connected to the image reading apparatus 400. The controller CPU 1751 issues an instruction for printing an image of a document read by the image reading apparatus 400 to an image forming unit 1756 in the image forming apparatus. The image forming unit 1756 forms an image according to the instruction.

  The controller ROM 1753 is a controller storage unit that stores control contents to be executed by the controller CPU 1751. The controller RAM 1752 is a storage unit used as a work area necessary for the controller CPU 1751 to perform control. The controller RAM 1752 is used for temporarily storing image data until it is stored in the image memory 1755 which is a non-volatile area. The controller RAM 1752 is also used as a storage unit when being taken out from the image memory 1755 and transferred to the external I / F 1758. used.

  An operation unit 1754 is an operation unit serving as a user I / F as a system, and accepts display of the contents of a job currently being performed and various detailed settings in the system. The image memory 1755 stores image data from the external I / F 1758 and the document reading unit communication unit 1757 and generally uses a large capacity memory such as an HDD. When the image forming unit 1756 functions as a printer, the image forming unit 1756 performs a series of processes for printing and outputting image data included in the system on recording paper.

  Next, a first image reading process using the image reading apparatus 400 of FIG. 1 will be described.

  3A and 3B are flowcharts showing the procedure of the first image reading process using the image reading apparatus 400 of FIG. This image reading process is executed by the reading CPU 1701 of the image reading apparatus 400 according to the first image reading processing program stored in the reading ROM 1703. This image reading process includes a step of determining whether or not the front / back reinversion process for aligning the paper discharge surface when the ADF 100 discharges the original is omitted.

  3A and 3B, when the document presence sensor 12 detects the presence of a document, the user (user) instructs the reading of the document image via the operation unit 1754, whereby the image reading process is started. . When the image reading process is started, the reading CPU 1701 (hereinafter simply referred to as “CPU 1701”) first prepares a reading state by the scanner unit 208 in order to read the originals stacked on the original tray 30 (step S1). 2301). That is, the CPU 1701 performs shading correction on the scanner unit 208, moves the scanner unit 208 after the shading correction to a position facing the reading guide plate 4 below the platen glass 201, and issues an image reading instruction. Wait until there is.

  Next, the CPU 1701 determines whether or not the reading instruction from the user is double-sided reading processing (job) (step S2302). If it is determined in step S2302 that the job is not a double-sided scanning job but a single-sided scanning job ("NO" in step S2302), the CPU 1701 counts up the number of scanned sheets (step S2303). Until the 30 document presence / absence sensors 12 no longer detect a document, the number of read sheets is counted based on the number of documents fed from a document tray 30 described later.

  Next, the CPU 1701 controls the document conveying unit 1704 to start feeding documents on the document tray 30 (step S2304). Next, the CPU 1701 controls the scanner unit driving unit 1705 and the image reading unit 1706 to read the surface image of the document (step S2305).

  Here, the single-sided reading process executed by the image reading apparatus 400 will be described with reference to FIG. FIG. 4 is a diagram for explaining single-sided reading processing using ADF.

  In FIG. 4A, when reading one side of the document, the scanner unit 208 of the reader 200 moves to a position facing the reference white plate 219, and shading is performed. In the shading, the output value from the image sensor 205 when the LED 203 is turned off (black) and the output value from the image sensor 205 when the LED 203 is turned on (white) are sampled to obtain the reading level at the time of reading the document image. Normalization is performed. After the shading, the scanner unit 208 moves to a reading position facing the reading guide plate 4 directly below the document table glass 201 and waits until the document is conveyed to the reading position.

  On the other hand, in the ADF 100, the paper feed roller 1 descends to the uppermost document surface of the document bundle S and starts rotating. As a result, feeding of the uppermost document in the document bundle S is started. When the uppermost document is fed and conveyed one by one from the document tray 30 on which the document bundle S composed of one or more document sheets is stacked, the two documents are fed by the feed roller 1 in an overlapping manner. However, the sheets are separated one by one by the action of the separation roller 2 and the separation pad 7.

  An ADF motor (not shown) serving as a drive source for the paper feed roller 1 and the separation roller 2 is a common drive source for both the transport roller 3 and the paper discharge roller 5, and all the rollers are a single drive source. It rotates in conjunction with the driving of the ADF motor. However, only the transport roller 3 rotates in the forward direction, that is, in the direction in which the document is transported from the document tray 30 toward the paper discharge tray 31 regardless of whether the ADF motor rotates forward or backward. Further, counting of a drive clock (not shown) is started at the timing when the paper feed roller 1 is lowered onto the paper surface for feeding and transporting and the ADF motor starts driving to transport the document.

  Since the original separated by the separation roller 2 and the separation pad 7 is supported only by the separation roller 2 until reaching the transport roller 3, the rotational speed of the separation roller 2 is caused by the friction between the original and the separation pad 7. It is transported only at a slower speed. When the document is sandwiched between the conveyance rollers 3, the document is accelerated to the conveyance speed of the conveyance roller 3 and conveyed. At this time, if the number of driving clocks of the ADF motor exceeds a predetermined value after the paper feed roller 1 is lowered to the document surface and the leading edge sensor 11 detects the leading edge of the document, It is determined that a paper jam (= delay jam) has occurred due to poor separation.

  The document that is accelerated and conveyed to the conveyance speed of the conveyance roller 3 reaches the document reading position between the reading guide plate 4 and the document table glass 201. For detecting that the leading edge of the document has reached the document reading position, the timing at which the leading edge of the document is detected by the document edge sensor 11 is used. That is, counting of the driving clock of the ADF motor (not shown) is started again from the timing when the document edge sensor 11 detects the presence of the document (ON). Since the rotation amount of the conveying roller 3 per driving clock is known in advance, the leading edge of the document is determined from the number of driving clocks based on the timing when the document edge sensor 11 is turned on (the broken line portion in FIG. 2). ) Can be calculated.

  At the timing when the leading edge of the document reaches the document reading position, the scanner unit 208 starts to capture, for example, an image of the surface of the document. At the timing when the image capture is started, the number of drive clocks is counted, and the trailing end of the document is detected using the counted result. That is, the number of driving clocks of the ADF motor from when the detection result of the document edge sensor 11 is turned on until it is turned off is counted, and based on the number of clocks and the rotation amount of the transport roller 3 per driving clock. The length of the manuscript is required. The ADF 100 does not have a sensor for detecting the length of the document on the document tray 30, but there is an upper limit on the document size specification that can be passed as a product. Therefore, if the document edge sensor 11 is not detected OFF even after waiting for the number of drive clocks based on the length determined from the upper limit of the specification while reading the document image, a paper jam (= stay jam) occurs. It is judged.

  Returning to FIG. 3, after reading the surface image of the document (step S <b> 2305), the CPU 1701 determines whether or not the document edge sensor 11 has detected the trailing edge of the document (step S <b> 2306).

  As shown in FIG. 4B, when the document edge sensor 11 detects OFF, it is determined that the document trailing edge has passed the document edge sensor 11 at that time, and the number of driving clocks of the ADF motor so far. The length of the original is calculated from the above. Since the start of driving clock counting is the same as the start of document image capture, the length of the original is calculated by multiplying the counted number of driving clocks and the movement distance per driving clock. At this time, based on the time when the trailing edge of the document passes the document edge sensor 11, the reading end timing of the document image in which the trailing edge of the document passes the document reading position is determined.

  If the trailing edge of the document is detected as a result of the determination in step S2306 (“YES” in step S2306), the CPU 1701 determines whether the document remains on the document tray 30 based on the detection result of the document presence / absence sensor 12. (Step S2307).

  The presence / absence of the second document is determined at the timing when the trailing edge of the first document s-1 shown by the broken line in FIG. This is performed based on the detection result. That is, even if the second document s-2 is on the document tray 30, the process for the first document s-1 is basically terminated when the image reading is completed. Thereafter, the timing at which the trailing edge of the original is discharged from the paper discharge roller 5 is determined by counting the drive clock of the ADF motor.

  That is, the first document s- 1 whose surface image has been read and passed through the document reading position is conveyed toward the discharge roller 5 disposed downstream of the reading guide plate 4 and is discharged by the discharge roller 5. The paper is discharged onto the paper tray 31.

  Since the paper feed roller 1 is kept down to the uppermost document surface of the document bundle S at the time of document reading, the subsequent immediately after the trailing edge of the first document s-1 passes through the paper feed roller 1. The paper feed roller 1 performs a paper feeding operation on the original. However, the conveyance of the first document s-1 is conveyed at the rotation speeds of the conveyance roller 3 and the paper discharge roller 5, whereas the second document s-2 rotates at a slower speed. It is conveyed by the paper feed roller 1 and the separation roller 2. For this reason, when the second document s-2 reaches the conveyance roller 3, a sufficient space is secured between the second document s-2 and the first document s-1. Accordingly, preparation is made to detect the leading edge of the second document s-2 by the document edge sensor 11, but when the ON detection is started immediately after the document edge sensor 11 detects OFF, the document edge sensor 11 is detected. There is a possibility of erroneous detection due to the vibration of a mechanical flag connected to. Accordingly, it is set so that the change in the ON / OFF level of the document edge sensor 11 is not adopted for a predetermined time.

  A change from OFF to ON of the document edge sensor 11 can be detected after a lapse of a predetermined time in which the change of the ON / OFF level of the document edge sensor 11 is not adopted. Next, processing is performed in the same manner as the first original s-1, the level of the original presence sensor 12 is detected at the OFF detection timing of the original edge sensor 11, and the original remains on the original tray 30. Judgment is made.

  Returning to FIG. 3A, if there is a document remaining on the document tray 30 as a result of the determination in step S2307 (“YES” in step S2307), the CPU 1701 determines the presence of the second document (step S2308). The CPU 1701 counts up the read number information in order to sequentially read the second document s-2 remaining on the document tray 30 or the subsequent documents (step S2303), and reads the single-sided image of the document. repeat.

  On the other hand, if no original remains on the original tray 30 as a result of the determination in step S2307 (“NO” in step S2307), the CPU 1701 determines that there is no next original (step S2309), and discharges the original after reading. The sheet is discharged onto the tray 31 (step S2310), that is, the CPU 1701 uses the ADF motor drive clock to detect the end of the document image after the document edge sensor 11 detects OFF (FIG. 4C The CPU 1701 rotates the paper discharge roller 5 until the trailing edge of the original passes through the paper discharge roller 5 and the original is discharged onto the paper discharge tray 31. In order to prevent the trailing edge of the document from being caught on the paper discharge roller 5, the CPU 1701 detects a predetermined time after the document edge sensor 11 detects OFF. The paper discharge roller 5 is rotated for a longer time than the imming, that is, the CPU 1701 passes the paper discharge roller 5 at the trailing edge of the document and discharges the document onto the paper discharge tray 31 (FIG. 4C). The ADF motor is controlled so that the paper discharge roller 5 rotates for a predetermined time more than [2]).

  After the document is discharged onto the discharge tray 31 (step S2310), the CPU 1701 stops the ADF motor. Thereafter, the CPU 1701 causes the ADF motor to reversely rotate by an amount corresponding to a predetermined distance to separate the paper feed roller 1 from the document placement surface of the document tray 30 (step S2311). Thereafter, the CPU 1701 ends the single-sided reading process of the document.

  The document discharged to the discharge tray 31 freely falls on the discharge tray 31 and presses the detection flag of the discharged document presence sensor 13 provided on the discharge tray 31. The presence / absence of a document on the paper discharge tray 31 is detected by utilizing the fact that the detection result of the discharge document presence / absence sensor 13 is changed by pressing the detection flag.

  Note that each time an image is read, the number-of-reads information is counted up in step S2303. Therefore, when it is determined that no original remains on the original tray 30 (“NO” in step S2307), it is immediately known how many originals are read in the image reading job.

  3A, if the result of determination in step S2301 is that a double-sided scanning job for a document has been instructed (“YES” in step S2302), the CPU 1701 advances the processing to step S2312. That is, the CPU 1701 performs the single-sided scanning job. Similarly to the case, first, the number information of the number to be read is counted up (step S2312 in Fig. 3B), and then the CPU 1701 controls the ADF motor to start feeding the document on the document tray 30 (step S2313).

  Next, in order to read the double-sided image, the CPU 1701 first starts reading the surface image of the document (step S2314).

  Here, a duplex reading job composed of two documents placed on the document tray 30 of the ADF 100 will be described.

  5A to 5C are diagrams for explaining double-sided reading processing using ADF. The operation on the scanner unit 208 side is the same as that in the above-described single-sided reading job. Therefore, the description is omitted.

  5A, when the double-sided reading job is started, the CPU 1701 drives the ADF motor to the uppermost original document s-1 of the original bundle S placed on the original tray 30 by driving the ADF motor. Then, the rotation is started and feeding of the original s-1 is started. Then, when the document edge sensor 11 detects the leading edge of the document s-1, the CPU 1701 once stops the ADF motor, and then reversely rotates the ADF motor by a predetermined distance to raise the paper feed roller 1. Then, it is separated from the original s-1. At this time, the paper feed roller 1 is locked in a state of being detached from the original s-1 by rotating the ADF motor reversely by a necessary distance. Therefore, in this state, even if the ADF motor is scored in the forward rotation direction again, the paper feed roller 1 remains in the state of being separated from the original s-1, so that the original s-2 placed on the original tray 30 is maintained. Is not newly fed.

  When the ADF motor is rotated in the reverse direction, the paper feed roller 1 rises, but as described above, the transport roller 3 rotates in the direction of transporting the document downstream even if the ADF motor is rotated in the reverse direction. When the ADF motor is rotated in the reverse direction to raise the paper feed roller 1 and then the ADF motor is rotated forward again, the first document s-1 is further conveyed toward the document reading position. As described in the case of single-sided reading, based on the count of the driving clock of the ADF motor, as shown in FIG. 5A, the surface of the original in the scanner unit 208 at the timing when the front end of the original is considered to have reached the original reading position. Image reading starts.

  Returning to FIG. 3B, after reading the front image of the document (step S2314), the CPU 1701 determines whether or not the document edge sensor 11 has detected the trailing edge of the document s-1 (step S2315). As shown in FIG. 5A (B), when the document edge sensor 11 detects the document edge, it is determined that the document trailing edge has passed the document edge sensor 11 at that time, as in the case of a single-sided reading job. To calculate the length of the document. At the same time, it is determined whether a document remains on the document tray 30 by the document presence / absence sensor 12, that is, whether there is a second document s-2 (step S2316).

  As a result of the determination in step S2316, if a document remains on the document tray 30 (“YES” in step S2316), the CPU 1701 determines the presence of the second document (step S2317). On the other hand, if no document remains on document tray 30 (“NO” in step S2316), CPU 1701 determines that there is no second document (step S2318).

  Here, there are two originals for the double-sided reading job, and at this time, the surface of the first original s-1 is being read, and the second second is placed on the original tray 30. The document s-2 remains. At this time, since the paper feed roller 1 is in the raised position, the second document s-2 is not yet fed and remains placed on the document tray 30. Further, since the rear end of the document s-1 is located at a position facing the document edge sensor 11, the document s-1 is reached when the rear end of the document s-1 reaches the document reading position, as in the case of the single-sided reading job. Timing is set so that image reading is completed.

  After determining the presence or absence of the second document (steps S2317 and S-2318), the CPU 1701 introduces the document s-1 into the reversal path 8 and reverses the front and back, and then the back image of the document s-1 is displayed. Reading is started (step S2319).

  The back side reading process in the duplex reading job is performed as follows.

  That is, as shown in FIG. 5A (C), the CPU 1701 stops the ADF motor after conveying the trailing edge of the original s-1 to the position immediately before the paper discharge roller 5, and reversely rotates the paper discharge roller 5. The ADF motor is rotated in reverse. At this time, as shown in (D) of FIG. 5B, the document s-1 conveyed to the left side in the figure from the position of the paper discharge roller 5 is conveyed in the direction of arrow A in the figure by the action of the reverse flapper 6. The Then, the document s-1 is conveyed until the leading edge of the document s-1 reaches the document edge sensor 11. Even if the ADF motor is rotated in the reverse direction and the paper discharge roller 5 is rotated in the reverse direction, the transport roller 3 rotates in the forward direction, so that the leading edge of the first document s-1 reaching the document edge sensor 11 is at the transport roller 3. Nipped and transported. In this case as well, the driving clock of the ADF motor is counted from the start of reverse rotation of the ADF motor, and the number of driving clocks until the document edge sensor 11 detects the leading edge of the document S-1 has a predetermined value. If it exceeds, it is determined that a paper jam has occurred (= delay jam).

  When the leading edge of the first document s-1 is detected by the document edge sensor 11, the CPU 1701 stops the ADF motor. At this time, since the leading edge of the document s-1 is sandwiched between the transport rollers 3, the CPU 1701 drives a solenoid (not shown) to separate the two rollers of the paper discharge roller 5, and then again ADF. Rotate the motor forward. As a result, as shown in FIG. 5B (E), both the transport roller 3 and the paper discharge roller 5 rotate in the forward direction, but the two rollers of the paper discharge roller 5 are separated from each other. Is conveyed toward the reading position only by the conveying roller 3.

  Next, as in the case of the single-sided reading job, the CPU 1701 starts counting the driving clock from the start of driving the ADF motor. Then, the CPU 1701 operates the scanner unit 208 to read the back image at a timing ((F) in FIG. 5B) when the leading end position of the document s-1 reaches the document reading position on the document table glass 201.

  As described with reference to FIG. 5A (C), the original surface read when the trailing edge of the original s-1 at the time of front side reading stops just before the paper discharge roller 5 is the surface of the original s-1. is there. Then, at the next document reading time ((F) in FIG. 5B), the back surface of the document s-1 is read. In this way, by switching back the original s-1 in the vicinity of the paper discharge roller 5, the back side image is read following the reading of the front side image of the original.

  At this time, the length of the document s-1 is calculated based on the detection of the trailing edge of the document s-1 by the document edge sensor 11 when the front side is read. The start timing of the contact operation is set. That is, at the start of reading the back side image shown in FIG. 5B (F), the length of the original from the leading edge of the original after the switchback to the portion held by the paper discharge roller 5 can be easily calculated. Accordingly, the CPU 1701 conveys the original s-1 by an amount corresponding to the length calculated from the start of reading the back side image, and then controls the ADF motor and solenoid to show the paper discharge roller 5 as shown in FIG. Make contact.

  After the sheet discharge roller 5 is brought into contact, the CPU 1701 conveys the document s-1 toward the sheet discharge tray 31 until the document edge sensor 11 detects OFF. At this time, unlike the time of reading the front image, the length of the document is already known in the detection of the trailing edge of the document on the back side, so the OFF detection waiting distance until it is determined as a stay jam is an appropriate length. Is set. That is, in this embodiment, for example, 5% of the document length calculated on the front surface is set as the stay jam margin. For example, when the document s-1 is A4 size (conveyance direction length is 297.0 mm), the OFF detection waiting distance is set as follows. That is, OFF detection is performed by adding 297.0 × 0.05 = 14.85 mm to the distance from the position where the trailing edge of the document s-1 is located to the document edge sensor 11 at the start of contact of the paper discharge roller 5. A waiting distance is set. When the driving clock is counted by the number obtained by dividing the OFF detection waiting distance by the moving distance of one driving clock of the ADF motor, it is determined that a paper jam has occurred.

  After the trailing edge of the document s-1 is detected by the document edge sensor 11, the CPU 1701 determines the calculation of the document length on the back side and the timing for ending the reading of the document image, as in the case of single-sided reading. The length of the original on the back surface basically matches the length of the original on the front surface, but since the transport path differs between reading the front image and reading the back image, the length of the original s-1 calculated when reading the front and back sides May deviate somewhat. Accordingly, the document length is calculated even when the back side image is read in order to align the top of the front and back images. However, the determination of the presence or absence of the second document s-2 on the document tray 30 is not performed again because it has already been performed at the time of reading the surface image of the document s-1.

  Returning to FIG. 3, after starting the reading of the back image of the document s-1, the CPU 1701 determines whether or not the reading of the back image of the document s-1 is completed (step S2320), and the reading of the back image is completed. Wait until As a result of the determination in step S2320, when the reading of the back image is completed (“YES” in step S2320), the CPU 1701 determines whether there is no second original and the number of read sheets is one. (Step S2321) At this time, the CPU 1701 refers to the determination result in step S2316 and the number-of-reading-page information.

  In the present embodiment, since there is the second document s-2, the determination in step S2321 is “NO”. In other words, if there is a second original, or if there is no second original, but the number of read sheets has already exceeded 1, the CPU 1701 advances the process to step S2323. That is, the CPU 1701 determines that it is necessary to perform the surface alignment process for reversing the front and back surfaces of the discharged document, and executes the surface alignment process for reversing the front and back surfaces at the end of reading the back surface image (step S2323).

  Here, the necessity of the surface alignment process will be described with reference to FIGS. 6A and 6B.

  6A and 6B are diagrams for explaining the relationship between the document surface on the document tray and the document surface on the paper discharge tray.

  In FIG. 6A, for the convenience of explanation, a white triangle mark is given to the front end side of the front surface of the first document s-3 to facilitate the distinction between the front and the back. A black triangular mark is given to the front end side of the surface of the original s-4. In the ADF configured to feed from the uppermost document in the document bundle, the original s-3 with the white triangle first fed and discharged in the single-sided scanning job, and then the black triangle is given. Document s-4 is fed and discharged. Therefore, on the paper discharge tray 31, the next discharged document s-4 is stacked on the first discharged document s-3.

  Since the document is turned upside down in the transport path 10, the document on the document tray 30 and the document on the paper discharge tray 31 are reversed. Accordingly, the bundle of documents ejected onto the delivery tray 31 in FIG. 6A is turned upside down to obtain a bundle of documents having the same order and orientation as the bundle of documents on the document tray 30. can get.

  Next, a case where a double-sided reading job for reading both front and back images on a similar document bundle is described.

  As shown in FIG. 6A (A), in the original bundle in which the original s-3 is overlaid on the original s-4 on the original tray 30, the surface of the original s-3 is read at the end of the discharge roller 5. The stopped state is as shown in FIG. 6A (B). At this time, since only the front surface of the document s-3 is read, if the document s-3 is reversed and the back surface is read in order to read the back surface, the result is as shown in FIG. 6C (C). At this time, since reading of both the front and back sides of the document s-3 is completed, when the document s-3 is discharged to the discharge tray 31 as it is, the surface of the document on the discharge tray 31 is on the upper side.

  Subsequently, when the original s-4 on the original tray 30 is read in the same manner on both the front and back sides and discharged onto the discharge tray 31 as shown in FIG. 6B, (D) is obtained. The document bundle on the paper discharge tray 31 in (D) of FIG. 6B does not have the same order and orientation as the original bundle ((A) of FIG. 6A) that was originally on the document tray 30 even if the front and back are reversed. That is, when the sheets are discharged in the order as shown in FIG. 6B (D), the user needs to rearrange the document bundle later.

  Therefore, do not discharge the original that has been read on both sides, and after reading the images on both sides, perform the surface alignment process that inverts the original again, and then discharges the original onto the discharge tray 31. To do. This re-inversion process is performed by conveying the original on which both the front and back sides are read to the inversion path 8. As a result, the order and orientation of the originals are aligned as in the original bundle on the paper discharge tray 31 in FIG. 6A.

  Returning to FIG. 3B, after the surface alignment processing is completed (step S <b> 2323), the CPU 1701 discharges the first document to the discharge tray 31 as shown in FIG. 5C (H) ( Step S2324). Next, the CPU 1701 determines whether or not a document remains on the document tray 30 (step S2325). As a result of the determination in step S2325, if the document remains on the document tray 30 (“YES” in step S2325), the CPU 1701 returns the process to step S2312. Next, the CPU 1701 counts up the number of readings (step S2312), and then continues the double-sided reading job of the document. On the other hand, if it is determined in step S2325 that no document remains on the document tray 30 ("NO" in step S2325), the CPU 1701 ends this process.

  On the other hand, if the determination result in step S2321 of FIG. 3B is “YES”, the CPU 1701 refers to the detection result of the discharged document presence / absence sensor 13 to determine whether there is a document on the discharge tray. (Step S2322).

  If the result of the determination in step S2322 is that there is no document on the paper discharge tray 31 (“NO” in step S2322), the CPU 1701 directly places the document on the paper discharge tray 31 without performing surface alignment processing by re-inversion. The paper is discharged (step S2324). This is because when there is no document on the paper discharge tray 31, there is no mixed loading on the paper discharge tray 31, so the surface alignment process by re-inversion is omitted, and the original is quickly discharged to speed up the process.

  Here, the omission of the surface alignment process will be described with reference to FIG. FIG. 7 is a diagram for explaining omission of the surface ordering process in the double-sided reading process for a single document.

  As described with reference to FIGS. 6A and 6B, when performing a double-sided reading job on a bundle of documents composed of a plurality of documents, surface alignment processing by re-inversion is required before each document is discharged to the discharge tray 31. However, the surface alignment process can be omitted after the double-sided scanning job when the number of documents is one.

  When there is one original, the original s-5 before the double-sided reading job is started is in the state shown in FIG. On the other hand, when the document is discharged to the paper discharge tray 31 without performing the surface alignment processing when the reading of both the front and back sides of the document is finished, the surface of the document s-5 becomes as shown in FIG. . In this case, the discharged document s-5 can be immediately returned to the document tray 30 as it is. Therefore, in the duplex reading job in which there is only one document based on the detection result of the document presence / absence sensor 12, the surface ordering process is omitted, and the document s-5 is discharged as it is after the image reading on both the front and back sides is completed. The paper is discharged to the tray 31, and the double-sided reading job is completed. By omitting the surface alignment process by reinversion, the time required for a series of double-sided reading jobs can be shortened.

  On the other hand, if the result of determination in step S2322 is that there is an original on the paper discharge tray 31 ("YES" in step S2322), surface alignment processing by re-inversion cannot be omitted.

  Hereinafter, a case where the surface alignment process cannot be omitted will be described.

  First, a case where a double-sided reading job for one original is performed after a single-sided scanning job for two originals will be described with reference to FIG.

  FIG. 8 is a diagram for explaining the orientation of the document on the paper discharge tray when a plurality of document reading processes are continuously executed.

  In FIG. 8A, for convenience of explanation, a white triangle mark is attached to the front end of the surface of the first document s-6 that is the target of the single-sided reading job in order to easily distinguish the front and back. A black triangular mark is attached to the front end of the surface of the second document s-7. Further, a white square mark is attached to the front end of the surface of one document s-8 to be subjected to the duplex reading job.

  When the single-sided reading job is completed for the two originals s-6 and s-7, the originals s-6 and s-7 with the front and back reversed are stacked on the paper discharge tray 31, respectively. In this state, one document s-8 is placed on the document tray 30, and after both sides of the document are read, the sheet is discharged to the sheet discharge tray 31 with the surface alignment process omitted. As shown in FIG. That is, the original s-8 in which the front and back are not reversed is placed on the originals s-6 and s-7 that are reversed. If these three document bundles are turned over together, the relationship between the front and back of the originals s-6 and s-7 for the single-sided reading job and the originals s-8 for the double-sided reading job is shifted. Needs to manually replace the front and back of the document s-8.

  In the example of FIG. 8B, since there are only three originals, it is only necessary to replace the front and back of one of the originals. However, while repeating a large number of reading jobs, confirming the front and back of each original. The work of correcting the order of the original bundle and the direction of the front and back is a troublesome work that is very troublesome. Accordingly, when a plurality of document reading jobs are continuously performed, as shown in FIG. 8C, the document s− in the double-sided reading job for one document can be simply turned over. Control to be executed is required without omitting the surface alignment operation of No. 8. In this case, the document is turned upside down twice.

  The specific surface alignment process is performed as follows. That is, as described with reference to FIGS. 5A and 5B, the ADF motor is stopped immediately before the trailing edge of the original s-1 reaches the paper discharge roller 5 and is rotated in the reverse direction. Then, after the document s-1 whose direction is reversed by the reversing operation reaches the document edge sensor 11, the solenoid is driven so as to separate the paper discharge roller 5, and the ADF motor is rotated forward to rotate the document s-1. Is reversed. By discharging to the paper discharge tray 31 in this state, the orientation of the original on the paper discharge tray 31 becomes the same as the orientation of the original at the time of single-side reading.

  3A and 3B, it is determined whether or not there is a document on the paper discharge tray 31 (step S2322). If there is a document (“YES” in step S2322), both sides of one document are processed. Even for a document after completion of a reading job, the surface alignment process is performed without omission, so that the user can easily separate the document bundle when the document bundle after discharging is taken out. Can do.

  In the present embodiment, the case where a flag type sensor is applied as the discharged document presence / absence sensor 13 has been described. However, a reflected light sensor or a human sensor that senses the presence of a surrounding person can also be applied.

  When a human sensor is used as the discharged document presence / absence sensor 13, the human sensor is installed in the vicinity of the paper discharge tray 31. When the human sensor is once detected by the human sensor during the execution of the image reading job and no human is detected after the end of the image reading job, the document on the paper discharge tray 31 is removed by the human hand. judge. That is, it is determined that the document on the paper discharge tray 31 has run out, and in this case, the surface alignment process can be omitted in the subsequent image reading job for one document.

  Next, a second embodiment will be described.

  The hardware configuration of the image reading apparatus according to the second embodiment is the same as that of the image reading apparatus according to the first embodiment, and only the control configuration is different. Hereinafter, the second image reading process executed in the present embodiment will be described focusing on differences from the image reading process (FIG. 3) in the first embodiment.

  In the first embodiment described above, it is determined whether or not to perform the surface alignment processing after reading the back image in a single-sided duplex job depending on the presence or absence of the document on the paper discharge tray 31. However, in practice, mixing of originals in a plurality of reading jobs by the same user becomes a problem, and the user can only copy the original bundle in the reading job immediately after he / she executes on the top of the discharge tray 31. It is not difficult to take out all at once. Therefore, in the second image reading process, whether or not to execute the surface alignment process is switched based on whether or not the same user performs a plurality of jobs in succession.

  9A and 9B are flowcharts showing the procedure of the second image reading process. This image reading process is executed by the CPU 1701 of the image reading apparatus 400 in accordance with an image reading processing program stored in the reading ROM 1703.

  9A and 9B, the procedure of the image reading process is basically the same as that of the first image reading process in the first embodiment described above. That is, the processes in steps S2402 to S2422 in the main image reading process are the same as the processes in steps S2301 to S2321 in the first image reading process. In addition, the processes in steps S2422 to S2426 in the main image reading process are the same as the processes in steps S2321 to S2325 in the first image reading process.

  In the present embodiment, the operation unit 1754 is provided with a user authentication unit using a user identification card (copy card) for permitting execution of copying. The user authentication unit functions as a user identification device that authenticates (identifies) a user who executes the document reading process. For this reason, the controller CPU 1751 knows the user as an executioner of all document reading jobs. Therefore, when the second image reading process is started, the CPU 1701 acquires information for notifying the presence / absence of a user change from the controller CPU 1751 (step S2401).

  Actually, since each user has a dedicated copy card, when the user starts his job, the user inserts the copy card into a predetermined portion of the image reading apparatus 400 and removes the copy card when the user finishes the job. . Thus, it is detected that the user has changed when the copy card is inserted or removed. In other words, when a document reading job is generated in a state where the user has changed, it is determined in step S2401 that the user has changed, and if the next document reading job is generated with the same user remaining, there is no change in user in step S2401. To be judged.

  After acquiring information indicating whether or not the user has changed, the CPU 1701 determines whether or not it is a double-sided reading job, as in the first image reading process of FIG. 3 (step S2403). Similarly, in the case of a double-sided reading job, the CPU 1701 executes reading of the front side (step S2415), reading of the back side (step S2420), no next document, and the number of readings is 1. It is determined whether it is a sheet (step S2422). If the determination result in step S2422 is “NO”, the CPU 1701 executes surface alignment processing (step S2424), and discharges the document to the discharge tray 31 (step S2425). It is determined whether or not a document remains on 30 (step S2426).

  The processing so far is the same as the first image reading processing, but the processing in the case where the determination result in step S2422 is “YES” is different from the first image reading processing. That is, in this image reading process, when the result of the determination in step S2422 is “YES”, the CPU 1701 determines whether or not to execute the surface alignment process at the end of the double-sided reading job for one original. Specifically, the CPU 1701 determines whether or not the reading job has been performed without any change of the user (step S2423). At this time, the CPU 1701 determines based on the information acquired in step S2401.

  As a result of the determination in step S 2423, when the reading job is performed without any change of the user (“YES” in step S 2423), the original of the previous reading job remains on the paper discharge tray 31. Therefore, in order to prevent the discrepancy between the front and back surface order of the document before reading in a plurality of jobs of the same user and the front and back surface order when the documents on the paper discharge tray 31 are turned over together, the CPU 1701 Surface alignment processing is executed (step S2424).

  On the other hand, if the result of determination in step S2423 is that the user has changed ("NO" in step S2423), the CPU 1701 determines that this job is the first reading job for the current user. Then, the CPU 1701 skips the surface alignment process even if another user's original remains on the paper discharge tray 31, and quickly discharges the original to the paper discharge tray 31 (step S2425). As a result, even if another user's original is forgotten on the paper discharge tray 31, only the original of the reading job is used as a material for determining whether or not the surface alignment process can be performed. It is possible to meet the user's expectation that the reading operation should be completed quickly.

  According to the processing in FIGS. 9A and 9A, the necessity of the surface alignment processing is determined using the information regarding the change in the user acquired in step S2401. As a result, even if another user's original is forgotten on the paper discharge tray 31, if the user is changed, the original after one front and back side reading is quickly discharged and the processing is performed quickly. Can be achieved.

  In the present embodiment, user authentication using a copy card has been described as an example. However, for example, a method of inputting a user ID from the operation unit 1754 may be employed. In addition, it is also possible to determine a user change from a human change detected by the human sensor using the human sensor and use it as the user change information in step S2401.

  Next, a third embodiment will be described.

  The hardware configuration of the image reading apparatus according to the third embodiment is the same as the hardware configuration of the image reading apparatus according to the first embodiment, and only the control configuration is different. Hereinafter, the third image reading process executed in the present embodiment is different from the first image reading process (FIGS. 3A and 3B) and the second image reading process (FIGS. 9A and 9B). The explanation will be focused on.

  In the first and second image reading processes described above, whether or not the surface alignment process is necessary is determined based on whether or not there is a discharged document on the discharge tray 31 and whether or not the job is a continuous job by the same user. I was judging.

  By the way, when the single-sided reading job is executed after the original is discharged onto the paper discharge tray 31 after the single-sided reading job for one original and the original is discharged to the paper discharge tray 31, Documents that have been turned upside down are stacked. In this case, in order to return the front and back surfaces of the document before reading, the order of the documents or the orientation of the front and back must be corrected, which complicates a complicated operation for the user.

  Therefore, in the main image reading process, when the surface alignment process is omitted, the storage unit stores the fact that the paper discharge surface is the reverse of the normal case (step S2523), and the paper discharge surface is reversed. Is displayed (step S2528).

  10A and 10B are flowcharts showing the procedure of the third image reading process. This image reading process is executed by the CPU 1701 of the image reading apparatus 400 according to the third image reading process program stored in the reading ROM 1703.

  10A and 10B, the procedure of the main image reading process is basically the same as that of the first image reading process described above. That is, the processes in steps S2501 to S2522 in the main image reading process are the same as the processes in steps S2301 to S2322 in the first image reading process. In addition, the processes in steps S2524 to S2526 in the main image reading process are the same as the processes in steps S2323 to S2325 in the first image reading process.

  When the third image reading process is started, the CPU 1701 prepares the scanner unit 208 (step S2501) as in the first image reading process of FIG. Is determined (step S2502). Similarly, in the case of a double-sided reading job, the CPU 1701 starts reading the front side (step S2514), starts reading the back side (step S2519), the next document is not present, and the number of readings is one. It is determined whether it is a sheet (step S2521). If the determination result in step S2521 is “NO”, the CPU 1701 executes surface alignment processing (step S2524), and after the document is discharged to the discharge tray 31 (step S2525), the document remains on the document tray 30. It is determined whether or not there is (step S2526). On the other hand, if the result of the determination in step S2521 is “YES”, the CPU 1701 determines whether there is a document on the paper discharge tray 31 (step S2522). Next, when the result of the determination in step S2522 is “YES”, the surface alignment process is executed (step S2524).

  The processing so far is the same as the first image reading processing, but the processing in the case where the determination result in step S2522 is “NO” is different from the first image reading processing.

  That is, if there is no document on the paper discharge tray 31 as a result of the determination in step S2522, the CPU 1701 omits the surface alignment process when performing a double-sided reading job for one document, and the paper discharge surface is reversed. This is stored in the reading RAM (step S2523). Next, the CPU 1701 discharges the document as it is to the discharge tray 31 (step S2525).

  Next, the CPU 1701 determines whether or not a document remains on the document tray 30 (step S2526). If no document remains (“NO” in step S2526), the CPU 1701 advances the process to step S2527. In other words, the CPU 1701 determines whether or not the discharge surface of the discharged document on the discharge tray 31 is upside down. At this time, the CPU 1701 refers to the presence or absence of the information stored in step S2523, and if there is information, notifies the controller side to display a warning as shown in FIG.

  FIG. 11 is a diagram illustrating an example of a warning screen.

  In FIG. 11, there are displayed that the direction of the original on the paper discharge tray is reversed and that the user is requested to take out the original before reading it again.

  10A and 10B, when the document is discharged without performing the surface alignment process, the CPU 1701 controls the operation unit 1754 to display a warning message that prompts the user to remove the document from the discharge tray ( Step S2528). As a result, the user can manually change the orientation of the original on the paper discharge tray 31 or take out the original from the paper discharge tray 31 when a warning prompting the user to remove the original is notified. Therefore, after the reading job is completed, it is possible to avoid the occurrence of complicated operations such as changing the order and orientation of the documents due to the user changing the orientation of the documents on the paper discharge tray 31.

  In this embodiment, when the front and back of the original on the paper discharge tray 31 are reversed, a warning for prompting the user to take out the original is displayed. On the other hand, it can be set so that the next reading job cannot be executed until the detection result of the discharged document presence sensor 13 on the discharge tray 31 is changed.

DESCRIPTION OF SYMBOLS 1 Paper feed roller 2 Separation roller 3 Carrying roller 5 Paper discharge roller 6 Reverse flapper 8 Reverse path 11 Document edge sensor 12 Document presence sensor 13 Paper discharge presence sensor 30 Document tray 31 Paper discharge tray 100 Automatic document feeder (ADF) )
200 Image reader (reader)
201 Document glass 208 Scanner unit 400 Image reading apparatus

Claims (8)

A document tray,
Transport means for transporting a document placed on the document tray to a reading position;
Reversing means for reversing the front and back of the document that has passed through the reading position;
Reading means for reading an image on the front surface of the document conveyed to the reading position or on the back surface of the document reversed by the reversing means and conveyed to the reading position;
A paper discharge means for discharging the original on which the image on the front surface or the reverse side of the front and back surfaces is read by the reading means onto a paper discharge tray;
A first mode in which the reversing unit reverses the front and back sides of the original on which the image on the back side has been read and discharges the paper to the paper discharge tray, and the reversing unit does not reverse the front and back sides and discharges the original to the paper discharge tray. Control means for controlling to discharge the document in any of the second modes for paper;
Detecting means for detecting the presence or absence of a document on the paper discharge tray;
Have
In the reading job for reading the front and back of a single document, the control unit causes the document to be discharged in the second mode when the detection unit determines that there is no document on the discharge tray. An image reading apparatus that discharges a document in the first mode when it is determined that there is a document on the discharge tray. A user identification device for identifying a user who executes a reading process for reading a document;
The control means includes: a user identified by the user identification device when the detection means detects the presence of a document from the absence of a document; and a next document reading job while the detection means detects the presence of a document. When the user identified at the start is the same, if the next reading job is a job for reading the front and back of one original, the original is discharged in the first mode. The image reading apparatus according to claim 1. It has a human sensor that detects people around you,
The control means causes the document to be discharged in the first mode when the human sensor continues to detect the human being after the human sensor once detects the human being until the image reading process is completed. The image reading apparatus according to claim 1. Informing means for informing the user of information,
2. The image reading apparatus according to claim 1, wherein when the document is discharged in the second mode, the control unit displays a message prompting the user to take out the document on the discharge tray on the notification unit. Comprising storage means for storing information;
When the document is ejected in the second mode, the control unit confirms that the document ejection surface of the document on the sheet ejection tray is reverse to the document ejected by reading only the front image. The image reading apparatus according to claim 1, wherein the image reading apparatus is stored in the storage unit.   The image reading apparatus according to claim 1, wherein the detection unit is a flag type sensor.   The detection means is a human sensor, and when the human sensor stops detecting human presence after detecting human presence, it is determined that no document exists on the paper discharge tray. The image reading apparatus according to claim 1, wherein the image reading apparatus is an image reading apparatus. Counting means for counting the number of documents placed on the document tray;
The image reading apparatus according to claim 1, wherein the counting unit counts the number of documents on which images on both front and back sides are read.