JP2020108097A - Document reading device and image forming apparatus - Google Patents

Abstract

To appropriately perform image reading for documents for which multiple feeding is detected in scan operations for a plurality of documents.SOLUTION: A document reading device 5 comprises: a platen glass 20 on which documents are placed; a document conveying unit 7 that conveys the documents to a reading position; and an image reading unit 6 that reads the documents placed on the platen glass 20 as placement reading to acquire image data, and reads the documents conveyed to the reading position by the document conveying unit 7 as conveyance reading to acquire image data. The document conveying unit 7 includes a multiple feeding detection unit 41 that detects multiple feeding of documents conveyed to the reading position. When the multiple feeding detection unit 41 detects multiple feeding of documents during execution of the conveyance reading of a plurality of documents, the document reading device 5 stops the conveyance reading and allows execution of re-reading through the placement reading for the multiple feeding documents for which multiple feeding is detected, and when the re-reading of the multiple feeding documents through the placement reading is executed, applies image data acquired for the multiple feeding documents through the placement reading to results of scan operations for the plurality of documents.SELECTED DRAWING: Figure 2

Description

1. Field of the Invention The present invention relates to a document reading device that performs scanning operations such as document feeding and image reading, and an image forming apparatus including the document reading device.

An image forming apparatus such as a multi-function peripheral includes a document reading device that performs scanning operations such as document feeding and image reading. The document reading device includes an image reading unit such as a scanner that reads an image from a document and a document feeding unit that feeds the documents one by one to the image reading unit.

For example, in the sheet conveying device (document conveying section) of Patent Document 1, when the document is detected by the double feeding sensor, the conveyance and reading of the document are interrupted, and the document in the conveyance path is placed on the document tray. When it is re-executed, a screen for allowing the user to select whether to disable the double feed detection and restart the job or to restart the job while the double feed detection is enabled is displayed.

JP, 2017-52593, A

2. Description of the Related Art Conventionally, in a document reading device, when documents are fed in multiples, the images of the documents may be read in the overlapped state, and the images may be lost. The scanning operation such as image reading is stopped. When the document multi-feed is detected, the document transport unit does not read the image from the document, so the job is restarted for the document in which the multi-feed is detected, that is, the scanning operation is performed again. Further, it is possible to set whether or not to detect the double feeding of the document when the scanning operation is redone.

By the way, there are cases where a document is scanned while attachments such as sticky notes, photographs and documents are attached, but the conventional document reading device detects the attachment attached to the document as a double feed. In order to avoid the double feed detection of the attachment attached to the document, it is necessary to disable the double feed detection or remove the attachment from the document as described above. When the double feed detection is set to be invalid, the attachment attached to the original document is not detected as the double feed, but when the double feed of two or more originals occurs, the double feed cannot be detected. Further, when an image is desired for the original with the attachment attached, the attachment cannot be removed from the original.

Therefore, the present invention has been made in view of the above circumstances, and an object of the present invention is to appropriately perform image reading of an original document in which double feeding is detected in a scanning operation of a plurality of original documents.

In order to achieve the above-mentioned object, the document reading apparatus of the present invention includes a document table on which a document is placed, a document conveying section which conveys the document to a predetermined reading position, and a document reading unit which is placed and read on the document table. An image reading unit for reading the placed document to obtain image data, and for carrying out reading the document, reading the document carried to the reading position by the document carrying unit to obtain the image data, The document transport unit includes a multi-feed detection unit that detects a multi-feed of the document that is transported to the reading position, and the multi-feed detection unit detects that the document is being fed while the multiple documents are being transported and read. When a double feed is detected, the conveyance and reading are stopped to enable re-reading by the above-described placement reading for the multi-feed original for which the double-feed is detected. When executed, the image data obtained by the above-described placement reading of the multi-fed original is applied to the scanning operation result of the plurality of originals.

The document reading device further includes an operation unit that receives a user operation, and when the multi-feed detection unit detects a multi-feed of the documents during execution of the multi-feed scanning of the plurality of documents, the multi-document reading is performed. Stop, and input the user's selection of re-reading of the multi-fed original for which double-feeding is detected by either of the above-mentioned placement reading and the above-mentioned conveyance reading in accordance with the operation of the operation unit, and according to the user selection Then, it is preferable that the above-described placement reading or the conveyance reading is performed on the multi-feed original, and then the conveyance reading is continued on the original following the multi-feed original.

Further, in the above document reading apparatus, when the user selection of rereading by the above-described document reading is input, the document reading device is placed on the document table regardless of whether the document is placed on the supply tray of the document feeding unit. Alternatively, the above-described placement reading of the original may be preferentially executed.

An image forming apparatus of the present invention is characterized by including an image forming unit that forms an image and the above document reading device.

According to the present invention, it is possible to appropriately perform image reading of a document in which double feeding is detected in a scanning operation of a plurality of documents.

It is a sectional view showing a compound machine concerning an embodiment of the present invention. FIG. 1 is a cross-sectional view showing a document reading device of a multifunction machine according to an embodiment of the present invention. FIG. 3 is a block diagram showing an electrical configuration of the multifunction peripheral according to the embodiment of the present invention. 6 is a flowchart showing a scan operation in the multifunction peripheral according to the embodiment of the present invention. FIG. 6 is a schematic diagram showing an example of a plurality of originals used for a scanning operation in the multifunction peripheral according to the embodiment of the present invention. FIG. 6 is a schematic diagram showing an example of a plurality of originals used for a scanning operation and image data obtained from these originals in the multifunction peripheral according to the embodiment of the present invention. FIG. 9 is a plan view showing an example of an inquiry screen when rereading of a multi-fed original is selected in the multifunction peripheral according to the embodiment of the present invention. FIG. 6 is a schematic diagram showing an example of a plurality of originals used for a scanning operation and image data obtained from these originals in the multifunction peripheral according to the embodiment of the present invention. FIG. 9 is a plan view showing an example of an inquiry screen at the time of restarting conveyance and reading of a subsequent document in the multifunction peripheral according to the embodiment of the present invention. FIG. 6 is a schematic diagram showing an example of a plurality of originals used for a scanning operation and image data obtained from these originals in the multifunction peripheral according to the embodiment of the present invention.

First, the overall configuration of the multifunction peripheral 1 (image forming apparatus) according to the embodiment of the present invention will be described with reference to FIG. Hereinafter, for convenience of explanation, the front side of the paper surface in FIG. 1 is referred to as the front side of the multifunction machine 1. Arrows L, R, U, and Lo that are appropriately attached to the respective figures indicate the left side, the right side, the upper side, and the lower side of the multifunction machine 1, respectively.

The multifunction device 1 includes a device body 2 having a substantially box shape. A plurality of paper feed cassettes 3 for accommodating sheets used for image formation are provided in the lower part of the apparatus main body 2. A paper discharge tray 4 is provided in the body space above the apparatus body 2.

A document reading device 5 for performing scanning operations such as document feeding and image reading is provided on the upper part of the apparatus main body 2. The document reading device 5 reads an image from a document as shown in FIGS. 1 and 2. The unit 6 and a document transport unit 7 that transports a document to the image reading unit 6 are provided. In the image reading unit 6 and the document transport unit 7, the left and right direction is mainly the document transport direction. In the following description, this transport direction is the length direction of the document, and the direction orthogonal to the transport direction is the document width direction. And Details of the image reading unit 6 and the document conveying unit 7 will be described later.

Further, an operation display section 8 (operation section) is attached to the front side on the upper part of the apparatus main body 2. The operation display unit 8 includes operation keys (operation unit) such as a numeric keypad, a start key, a system menu key, a transmission key, and a copy key, and a display device such as a touch panel, and receives an operation input from a user.

An intermediate transfer belt 10 as an image carrier is installed between a plurality of rollers at the center of the apparatus main body 2. Below the intermediate transfer belt 10, four image forming units 11 for forming an image are provided for each color of toner (for example, four colors of yellow, magenta, cyan, and black). An exposure unit 12 is provided below the four image forming units 11. A secondary transfer unit 13 is provided at the right end of the intermediate transfer belt 10, and a cleaning unit 14 for cleaning the intermediate transfer belt 10 is provided at the left end of the intermediate transfer belt 10. The secondary transfer portion 13 is composed of a part of the right end side of the intermediate transfer belt 10 and a secondary transfer roller.

A photoconductor drum as an image carrier is rotatably provided in each image forming unit 11, and a charging unit, a developing unit, a primary transfer unit, a charge eliminating unit, and a cleaning unit are provided around the photoconductor drum. And are arranged in the order of the electrophotographic process. A toner container corresponding to each image forming unit 11 is provided above the developing unit for each toner color (for example, four colors of yellow, magenta, cyan, and black), and each toner container stores toner of each color. Accommodate.

A conveyance path 15 for a sheet used for image formation is provided on the right side of the apparatus main body 2. A plurality of sheet feeding units 16 are provided for each of the plurality of sheet feeding cassettes 3 at the upstream portion of the transport path 15. The secondary transfer unit 13 is provided in the middle stream of the transport path 15. A fixing unit 17 is provided on the downstream side of the transport path 15, and a paper discharge unit 18 is provided on the downstream end of the transport path 15.

Next, the image forming operation of the multifunction machine 1 will be described. In the multifunction device 1, image data is input from the image reading unit 6 or an external computer. In each image forming unit 11, the photosensitive drum is charged by the charging unit and then exposed by the exposing unit 12 based on the image data, so that an electrostatic latent image is formed on the photosensitive drum. The electrostatic latent image on the photosensitive drum is developed into a toner image of each color by the developing unit. The toner image on the photosensitive drum is primarily transferred onto the surface of the intermediate transfer belt 10 by the primary transfer portion. The four image forming units 11 sequentially perform the above operation to form a full-color toner image (color toner image) on the intermediate transfer belt 10. The color toner image is supplied to the secondary transfer portion 13 at a predetermined secondary transfer timing by the rotation of the intermediate transfer belt 10.

On the other hand, the paper stored in the paper feed cassette 3 is taken out by the paper feed unit 16 and conveyed on the conveyance path 15. Then, the sheet on the transport path 15 is transported to the secondary transfer portion 13 at the above-mentioned predetermined secondary transfer timing. In the secondary transfer portion 13, the color toner image on the intermediate transfer belt 10 is secondarily transferred onto a sheet. The sheet to which the color toner image is secondarily transferred is conveyed to the downstream side of the conveying path 15, the color toner image is fixed on the sheet by the fixing unit 17, and then the sheet is discharged from the sheet discharging unit 18 to the sheet discharging tray 4. It

Next, the image reading unit 6 will be described. The image reading unit 6 is arranged above the inner space of the apparatus main body 2, and includes a platen glass 20 as a document table and a reading slit 21 on the upper surface of the apparatus main body 2, as shown in FIG. The reading slit 21 is provided on the left side, and the platen glass 20 is provided on the right side of the reading slit 21. The image reading unit 6 also includes an optical scanning unit 22, a reflection unit 23, a condenser lens 24, and an imaging unit 25 such as a CCD.

The optical scanning unit 22 has a light source 26 that irradiates the original document above the platen glass 20 and the reading slit 21 with light, and a reflection mirror 27 that directs the light reflected by the original document to the reflection unit 23. The reflection unit 23 has a plurality of reflection mirrors 28. The optical scanning unit 22 is formed in an elongated shape in the main scanning direction (front-back direction), and is provided so as to be movable in the sub-scanning direction (horizontal direction). The reflection unit 23 is provided so as to move according to the movement of the optical scanning unit 22 so that the optical path length from the document to the condenser lens 24 is always constant. The condenser lens 24 and the imaging unit 25 are fixed on the right side.

In the image reading unit 6, in the case of the placement reading for reading the image of the document placed on the platen glass 20, the optical scanning unit 22 moves from the left side to the right direction (sub-scanning direction) while shifting the reading position. Read an image from the original. At this time, the optical scanning unit 22 irradiates the document on the platen glass 20 with light from the light source 26, and causes the reflected light from the document to enter the imaging unit 25 via the reflection unit 23 and the condenser lens 24. .. The image capturing unit 25 captures an image of a document by performing photoelectric conversion based on reflected light from the document. Then, the image reading unit 6 generates image data by scanning the document placed on the platen glass 20 from the leading edge to the trailing edge. The image reading unit 6 may include a placed document sensor 29 that detects a document placed on the platen glass 20, and when the document is detected by the placed document sensor 29, the image reading unit 6 may be able to perform the placement reading. ..

Further, in the image reading unit 6, in the case of carrying and reading the image of the document carried from the document carrying unit 7, the optical scanning unit 22 fixes the position corresponding to the reading slit 21 as the reading position and reads the image from the document. read. At this time, the optical scanning unit 22 irradiates the document on the reading slit 21 with light from the light source 26, and causes the reflected light from the document to enter the imaging unit 25 via the reflecting unit 23 and the condenser lens 24. .. The image capturing unit 25 captures an image of a document by performing photoelectric conversion based on reflected light from the document. Then, the image reading unit 6 generates image data by scanning the document passing over the reading slit 21 from the leading edge to the trailing edge.

When a document is conveyed by the document conveying unit 7, when a document double feeding is detected by a double feeding detecting unit 41, which will be described later, the image reading unit 6 reads the double fed document (double feeding document). Image data may be generated, but the image data is deleted upon rereading. Alternatively, the image reading unit 6 does not have to read an image or generate image data for a multi-fed document.

The image reading unit 6 transmits the image data generated for each document to the control unit 50 (see FIG. 3) of the multifunction machine 1 and stores the image data in the storage unit 51. Monochrome image reading and color image reading are set as image reading setting conditions of the multi-function peripheral 1 and the image reading unit 6, and the image reading unit 6 reads a color image to acquire color data (RGB data), A monochrome image is generated by binarizing a color image or the like.

Next, the document conveying section 7 will be described. The document feeding unit 7 is arranged above the image reading unit 6, and has a function of feeding a document and is attached to be openable and closable as a cover member that covers the platen glass 20 (the upper surface of the apparatus body 2) of the image reading unit 6. .. The original document transport unit 7 includes an open/close sensor 42 that detects opening/closing of the platen glass 20. Even if the open/close sensor 42 detects blockage of the original document transport unit 7, even if the image reading unit 6 can perform the placement reading. Good.

As shown in FIG. 2, the document transport unit 7 includes a supply tray 30 on which a document before image reading is placed, a discharge tray 31 from which a document after image reading is discharged, and a document on the supply tray 30. A transport mechanism 32 that sends the sheet to the discharge tray 31 via the reading position corresponding to the reading slit 21. The transport mechanism 32 is provided on the left side corresponding to the reading slit 21, the supply tray 30 extends from the upper part of the transport mechanism 32 to the right, and the discharge tray 31 extends from the lower part of the transport mechanism 32 to the right. Is set up.

The supply tray 30 is formed so as to incline slightly downward from the right end thereof toward the transport mechanism 32. The upper surface of the supply tray 30 is a placement surface on which a plurality of documents can be placed, and on the placement surface, a pair of guides that regulate the position of the documents in the width direction are provided slidably in the width direction. The document transport unit 7 may include a transported document sensor 43 that detects a document placed on the supply tray 30, and when the document sensor 43 detects the document, the document can be scanned.

The discharge tray 31 is formed on a part of the upper surface of the base of the document transport unit 7 that covers the upper surface of the apparatus body 2, and the base of the document transport unit 7 is formed to have the same diameter as the apparatus body 2.

The transport mechanism 32 is surrounded by a cover 33, and a supply port 34 opened at a position corresponding to the supply tray 30 is formed in an upper portion of the right surface of the cover 33, and a discharge tray 31 is provided in a lower portion of the right surface of the cover 33. A discharge port 35 that opens at a corresponding position is formed. The transport mechanism 32 has a transport path 36 inside the cover 33. The transport path 36 extends leftward from the supply port 34, curves downward on the left side, and folds back rightward to form the reading slit 21. It is formed so as to extend to the discharge port 35 via the corresponding reading position. The transport mechanism 32 includes a supply roller 37, a plurality of transport rollers 38, a discharge roller 39, a document detection unit 40, and a multi-feed detection unit 41 along the transport path 36.

The supply roller 37 is rotatably provided near the supply port 34, and supplies the originals on the supply tray 30 one by one to the transport path 36 by rotating. The discharge roller 39 is rotatably provided in the vicinity of the discharge port 35, and rotates to discharge the document from the transport path 36 to the discharge tray 31. The plurality of transport rollers 38 are rotatably provided in the transport path 36 between the supply roller 37 and the discharge roller 39 with a space therebetween. The supply roller 37, the plurality of transport rollers 38, and the discharge roller 39 are rotationally driven by the rotational drive force transmitted from a drive unit (not shown) controlled by the control unit 50 (see FIG. 3 ).

The document detection unit 40 detects a document conveyed through the conveyance path 36, and is composed of, for example, an optical sensor including a light emitting unit and a light receiving unit. The document detection unit 40 outputs a detection signal indicating the detection result, for example, an ON signal when the document is detected and an OFF signal when the document is not detected. The document detecting section 40 is provided at any position along the transport path 36. For example, a plurality of document detecting sections 40 are provided at each transport position so as to detect a document at different transport positions on the transport path 36. It may be arranged.

The document detecting unit 40 starts detecting the document after the document conveying unit 7 starts conveying the document, and detects from the leading edge to the trailing edge of the document. For example, the document detection unit 40 is arranged on the upstream side of the reading position corresponding to the reading slit 21 in the transport direction of the transport path 36, and detects the leading edge of the document entering the reading position to reach the reading position. The document entry timing, that is, the reading start timing is acquired. Further, the document detecting section 40 is arranged on the downstream side of the reading position corresponding to the reading slit 21 in the carrying direction of the carrying path 36, and detects the end of the document exiting from the reading position to detect the end of the document from the reading position. The document exit timing, that is, the reading end timing is acquired.

The double feed detection unit 41 is provided at a predetermined position between the supply roller 37 and the reading position corresponding to the reading slit 21 in the transport path 36. The multi-feed detection unit 41 detects an overlap of documents conveyed on the conveyance path 36 as a multi-feed, and may be configured by, for example, an ultrasonic sensor. The multi-feed detection unit 41 detects an overlap between several originals or an original and an attachment attached to the original (for example, a sticky note, a photograph, a document, etc.), and a detection signal indicating the detection result. Is output. For example, the multi-feed detection unit 41 outputs an ON signal when it detects the multi-feed of the document (step S2: YES in FIG. 4) and does not detect the multi-feed of the document (step S2: NO in FIG. 4). Outputs an off signal to. It should be noted that a plurality of multi-feed detection units 41 may be arranged at intervals in the width direction so that the multi-feed of the document can be detected over the width direction.

The multi-feed detection unit 41 is arranged so as to detect the multi-feed of the document at a predetermined detection position in the transport direction. For example, the detection position is the same as the detection position of the document detection unit 40 on the upstream side of the reading position. Is provided. Then, the double-feed detection unit 41 detects the double-feed of the document after the document transport unit 7 starts to transport the document and until the document detection unit 40 detects the leading edge of the document to the trailing edge. ..

Next, the electrical configuration of the above multifunction device 1 will be described with reference to FIG. The multifunction device 1 includes a control unit 50 including a CPU and the like, and a storage unit 51 including a ROM and a RAM inside the apparatus main body 2.

The control unit 50 controls each unit connected to the control unit 50 based on the control program and the control data stored in the storage unit 51. The control unit 50 is connected to the image reading unit 6, the original document transport unit 7 (sensor), the operation display unit 8, the image forming unit 11, the exposure unit 12, and other components of the multi-function peripheral 1. It controls scanning operations such as conveyance and image reading by the image reading unit 6. The control unit 50 also functions as the rereading control unit 52 by executing the program stored in the storage unit 51. The rereading of the multi-fed original by the reread control unit 52 is included in the scanning operation.

FIG. 4 shows a flowchart showing the scanning operation. In one scan operation of the job, one or more originals (a plurality of originals) placed on the supply tray 30 of the original conveying unit 7 are conveyed and read by the original conveying unit 7 to convey the originals (steps in FIG. 4). S1) and image reading by the image reading unit 6 (step S3 in FIG. 4) are automatically performed.

The image data generated by the image reading unit 6 is sequentially stored in the storage unit 51 (step S4 in FIG. 4) and is stored in, for example, the document transport order. Therefore, the image data is stored in the storage unit 51 based on the transport order. Can be obtained. The document transport unit 7 can grasp the order of document transport by monitoring the driving of the supply roller 37 and the discharge roller 39 that transport the document and the detection of the transported document by the document detection unit 40.

Further, in the scanning operation, for the multi-fed original document in which the multi-fed document is detected by the multi-fed document detection section 41 in the conveyance and reading of a plurality of originals (step S2: YES in FIG. 4), the reread control section 52 rereads the image ( Steps S5 to S11 in FIG. 4). Therefore, the image data of a plurality of originals is stored in the storage unit 51 without changing the conveying order regardless of the double feeding (step S4 in FIG. 4).

When the image reading of all the originals is completed by the scanning operation, one image data file in which the image data of each original is put together is generated. For example, when one document is used as image data for one page, an image data file having the number of pages corresponding to the number of documents is generated.

Next, the reread control unit 52 will be described. The reread control unit 52 recognizes the double feeding of the document based on the detection signal of the double feeding detection unit 41, and detects the passage of the document at the detection position of the double feeding detection unit 41 on the upstream side of the reading position. It is grasped based on the detection signal of the unit 40.

For example, the reread control unit 52 measures the elapsed time from when the leading edge of the document passes the detection position, and based on this elapsed time, the distance from the leading edge of the document to the detection position in the transport direction (length direction). The distance is calculated, that is, the position in the length direction on the document corresponding to the detection position is calculated. As a result, the reread control unit 52 grasps the position in the length direction of the multi-feeding portion on the document. In addition, the reread control unit 52 determines a double-feed position on the document depending on which of the multiple-feed detection units 41 arranged side by side in the width direction detects the double-feed. Figure out the widthwise position of. In addition, when the multi-feed is continuously detected in the length direction and the width direction from the leading edge to the end of the document, the re-reading control unit 52 selects one continuous multi-feed. May be determined as.

The re-reading control unit 52 detects that the double-feed detection unit 41 detects the double-feed of the documents while the multiple-documents placed on the supply tray 30 of the document transport unit 7 are being fed and read ( In step S2 of FIG. 4: YES), after the multi-fed original is ejected to the ejection tray 31, the scanning operation of the original following the multi-fed original (subsequent original) is stopped. Then, the re-reading control unit 52 operates and displays the user selection of re-reading of the multi-fed original by either the placement reading or the conveyance reading in order to read the image from the multi-fed original before the scanning operation of the subsequent original. Input according to the operation of the section 8.

For example, the re-reading control unit 52 causes the operation display unit 8 to display an inquiry screen 53 (see FIG. 7) for inquiring the user selection of the placement reading and the conveyance reading of the multi-fed original (step S5 in FIG. 4). On the inquiry screen 53, input keys and the like capable of inputting user selections are displayed. Further, in the inquiry screen 53, the conveyance order of the multi-fed originals may be displayed as the number of pages of the multi-fed originals among a plurality of originals to indicate the number of pages to be reread. When the image data of the multi-fed original is generated, the image data may be displayed as a preview on the inquiry screen 53.

In the inquiry screen 53 of the operation display unit 8, when the user selects the placement reading of the multi-fed original (step S6: YES in FIG. 4), the re-reading control unit 52 causes the multi-fed original platen glass 20 (the original document). A placement instruction is given to the table, and it is displayed on the inquiry screen 53, for example. At this time, it is considered that a document subsequent to the multi-fed document is placed on the supply tray 30, so the reread control unit 52 inquires to remove the document subsequent to the multi-fed document from the supply tray 30. You may instruct via the screen 53.

The double-fed original is placed on the platen glass 20 (step S7 in FIG. 4), and the double-fed original on the platen glass 20 is detected by the placed original sensor 29, and the original feeding section 7 is closed and opened/closed. When the sensor 42 detects the blockage of the document feeding unit 7, the document reading device 5 can perform the placement reading. Here, when the start key of the operation display unit 8 is operated, the image reading unit 6 starts image reading (placement reading) of the multi-fed original on the platen glass 20 as re-read of the multi-fed original. An image is read from the sent document to obtain image data (step S8 in FIG. 4). Then, when the placement reading is completed, the rereading control unit 52 applies the image data acquired from the multi-fed original on the platen glass 20 to the scanning operation result and stores it in the storage unit 51 (step S4 in FIG. 4). ..

When the user selects conveyance feeding of the multi-fed original on the inquiry screen 53 of the operation display unit 8 (step S6 in FIG. 4: NO), the re-reading control unit 52 transfers the multi-fed original to the tray 30. Is placed and displayed on the inquiry screen 53, for example. At this time, it is considered that a document subsequent to the multi-fed document is placed on the supply tray 30, so the reread control unit 52 inquires to remove the document subsequent to the multi-fed document from the supply tray 30. You may instruct via the screen 53.

When the multi-fed document is placed on the supply tray 30 (step S9 in FIG. 4) and the multi-fed document on the supply tray 30 is detected by the conveyance document sensor 43, the document reading device 5 can perform the conveyance reading. become. Here, when the start key of the operation display unit 8 is operated, the document feeding unit 7 starts feeding the multi-fed document on the feed tray 30, and the image reading unit 6 supplies the multi-fed document as reread. Image reading (conveying reading) of the multi-fed original conveyed from the tray 30 is started, and an image is read from the multi-fed original to obtain image data (step S10 in FIG. 4). Then, when the conveyance reading ends, the re-reading control unit 52 applies the image data obtained from the multi-fed original conveyed from the supply tray 30 to the scanning operation result and stores it in the storage unit 51 (step S4 in FIG. 4). ).

Since the image data of a plurality of documents is sequentially stored in the storage unit 51, the image data of the multi-fed document is stored as the image data of the page following the previous page of the multi-fed document.

When the re-reading of the multi-fed original is completed in this way, the re-reading control unit 52 gives an instruction via the inquiry screen 53 to reload the original following the multi-fed original on the supply tray 30. At this time, the inquiry screen 53 may indicate the number of pages of the document following the multi-fed document. Then, if there is a document following the multi-fed document (step S11: YES in FIG. 4), the original conveyance reading of the subsequent document is continued in response to the operation of the start key of the operation display unit 8.

According to the present embodiment, as described above, the document reading device 5 includes the platen glass 20 (document table) on which the document is placed, the document transport unit 7 that transports the document to a predetermined reading position, and the document loading unit 7. For reading, an image reading unit 6 that reads an original placed on the platen glass 20 to obtain image data, and as conveyance reading, an image reading unit 6 that reads the original conveyed to the reading position by the original conveying unit 7 and obtains image data. , Is provided. The document feeding unit 7 includes a double feeding detection unit 41 that detects a double feeding of documents fed to the reading position. When the multi-feed detection unit 41 detects the multi-feed of the originals while the multi-feed is being performed, the original reading device 5 stops the multi-feed reading and loads the multi-feed originals for which the multi-feed is detected. When the re-reading by the placement reading is enabled and the re-reading by the placement reading is performed on the multi-fed original, the image data obtained by the placement reading on the multi-fed original is applied to the scanning operation result of a plurality of originals.

For example, when multiple originals are conveyed and read, if an original with sticky notes, photographs, documents, and other attachments is conveyed, double feeding of the originals is detected. Even if the originals are individually conveyed, double feeding is detected again. Therefore, in the present embodiment, re-reading of the multi-fed original is performed by placing and reading, so that it is not necessary to remove the multi-fed original from the original to which the attached material is attached, and thus it is possible to perform image reading without detecting the multi-feed. You can succeed. Further, since it is not necessary to retry the transportation of the original with the attached material many times, it is possible to suppress the pain of the original caused by the transportation. Since the image data acquired by the placement reading is applied to the scanning operation result of the feeding reading of a plurality of documents, the image data obtained by the feeding reading and the image data obtained by the loading reading are It is recorded in the same image data file without being saved in different files. In this way, it is possible to appropriately perform image reading of the original document for which multiple feeding has been detected in the scanning operation of a plurality of original documents.

In addition, in the above-described embodiment, an example in which re-reading of a multi-fed document is started in response to an operation of the start key of the operation display unit 8 has been described, but the present invention is not limited to this example. For example, in another embodiment, the re-reading control unit 52 may display a re-reading start key for operating the start of re-reading of a multi-fed original on the inquiry screen 53.

Further, according to the present exemplary embodiment, the document reading device 5 further includes an operation display unit 8 (operation unit) that receives a user's operation, and the multi-feed detection unit 41 causes the document to be read while the document is being conveyed and read. When the multi-feed of the document is detected, the conveyance reading is stopped, and the user selection of the re-reading of the multi-feed document for which the multi-feed is detected is performed by either the placement reading or the conveyance reading according to the operation of the operation display unit 8. The input is performed, and the placement reading or the conveyance reading is performed on the multi-fed original according to the user's selection, and then the conveyance reading is continued on the original following the multi-feed original.

For example, when a plurality of originals are conveyed and read, if two or more originals are stuck and conveyed due to static electricity or moisture, double feeding of the originals is detected. If the sheet is conveyed to, the image reading can be successful without double feeding being detected. Therefore, in the present embodiment, with respect to the re-reading of the multi-fed original, the user can select the placement reading or the conveyance reading. Accordingly, it is possible to perform the scanning operation of a plurality of originals by selectively using the placement reading and the conveyance reading according to the original without invalidating the double feed detection function.

An example in which the original reading device 5 performs a scanning operation for all four originals as shown in FIG. 5 will be described below. In this example, it is assumed that a sticky note is attached to the original on the second page.

First, in the document reading device 5, four documents are set on the supply tray 30 to be conveyed and read. As shown in FIG. 6, the first page of the original is successfully conveyed and image-read without double feeding, and image data corresponding to the first page of the original is stored in the storage unit 51.

The original on the second page is conveyed without double feeding. However, since the sticky note is attached, the double feeding detecting unit 41 detects the double feeding. At this time, the re-reading control unit 52 stops the scanning operation of the subsequent third page and subsequent originals (subsequent originals) after the double-fed original for the second page is ejected to the ejection tray 31. Then, as shown in FIG. 7, the rereading control unit 52 causes the operation display unit 8 to display an inquiry screen 53 for inquiring user selection of the placement reading and the conveyance reading for the multi-fed original.

Here, when the placement reading is selected, the multi-fed original is set on the platen glass 20, and the start key of the operation display unit 8 or the rereading start key of the inquiry screen 53 is operated, the image reading unit 6 Image data is acquired by reading the double-fed document on the platen glass 20. As a result, as shown in FIG. 8, the image reading of the multi-fed original is successful, and the image data corresponding to the original of the second page is stored in the storage unit 51.

Next, as shown in FIG. 9, the reread control unit 52 instructs via the inquiry screen 53 to set the third and subsequent pages of the document following the multi-fed document on the supply tray 30. Here, when the subsequent document is set on the supply tray 30 and the start key of the operation display unit 8 or the rereading start key of the inquiry screen 53 is operated, the conveyance and reading of the third and subsequent pages of the document is restarted, The document is transported by the document transport unit 7, and the image reading unit 6 reads the document and acquires image data. Since the attachments are not attached to the manuscripts on the third and subsequent pages, if double feeding does not occur, as shown in FIG. 10, the image reading succeeds and the image data corresponding to the manuscripts on the third and subsequent pages is generated. It is stored in the storage unit 51.

Further, in the above-described embodiment, the reread control unit 52 has been described as an example of instructing to remove the document following the multi-fed document from the supply tray 30, but the present invention is not limited to this example. For example, in another embodiment, the re-reading control unit 52 does not give an instruction to remove the original from the supply tray 30 when the user selection of the re-reading by the placement reading is input, and the re-reading control unit 52 does not instruct the supply tray 30 of the original conveying unit 7. Regardless of the placement of the original document on the plate 30, the placement reading on the original document placed on the platen glass 20 may be preferentially executed.

As a result, when re-reading of the multi-fed original is performed by the placement reading, the original following the multi-fed original is removed from the supply tray 30, or the subsequent original is re-supplied to continue the conveyance and reading of the subsequent original. It is not necessary to place it on the tray 30, and the user's labor can be reduced. When re-reading the multi-fed original by carrying and reading, the multi-fed original and the following original are conveyed separately, so that it is necessary to remove the subsequent original from the supply tray 30.

In the above embodiment, an example in which the control unit 50 provided in the multifunction peripheral 1 controls the scanning operation of the document reading device 5 has been described, but the present invention is not limited to this. For example, in a further embodiment, Another control device provided in the document reading device 5 may be configured to control the scanning operation.

Further, in the above-described embodiment, an example in which the inquiry display screen 53 for the user is displayed on the operation display unit 8 included in the multi-function peripheral 1 has been described, but the present invention is not limited to this, and, for example, in a further embodiment, The inquiry screen 53 may be displayed on another display device included in the document reading device 5.

In the above-described embodiment, the case where the configuration of the present invention is applied to the document reading device 5 and the multifunction machine 1 including the document reading device 5 has been described, but in another different embodiment, another image including the document reading device 5 is described. The configuration of the present invention may be applied to a forming apparatus (printer, copier, facsimile, etc.).

1 Multifunction device (image forming device)
5 document reading device 6 image reading unit 7 document transport unit 8 operation display unit 11 image forming unit 32 transport mechanism 36 transport path 40 document detection unit 41 double-feed detection unit 50 control unit 51 storage unit 52 reread control unit 53 inquiry screen

In order to achieve the above-mentioned object, the document reading apparatus of the present invention includes a document table on which a document is placed, a document conveying section which conveys the document to a predetermined reading position, and a document reading unit which is placed and read on the document table. acquires image data by reading the placed the document, as reading transport, an image reading unit that acquires the image data by reading the document conveyed to the reading position by the document conveying unit, before Symbol reading a double feed detector for detecting the double feed of the document being conveyed to a position, during the reading the transport of a plurality of the document, when the double feed detection unit detects the double feed of the document, the transport When the double-feeding original for which the double feed is detected is stopped and the re-reading is possible by the above-mentioned placement reading, and the double-feeding original is re-read by the above-mentioned placement reading, The control unit that applies the image data acquired by the above-mentioned reading and placement to the scanning operation result of the plurality of originals.

The above document reading device further includes an operation unit that receives a user operation, and the control unit detects the double feeding of the document by the double feeding detection unit while the conveyance and reading of the plurality of documents are being performed. In this case, the conveyance reading is stopped, and the user selection of re-reading by any one of the above-mentioned placement reading and the conveyance reading is input in response to the operation of the operation unit with respect to the multi-feed original in which the double feeding is detected. According to the user's selection, it is preferable that the above-described placement reading or the conveyance reading is performed on the multi-fed original, and then the conveyance reading is continued on the original following the multi-fed original.

Further, in the above document reading apparatus , the control unit, regardless of whether the document is placed on the supply tray of the document feeding unit, when the user selection of re-reading by the placement reading is input, The above-described placement/reading of the document placed on the document table may be preferentially executed.

For example, the re-reading control unit 52 measures the elapsed time after the leading edge of the document has passed the detection position of the multi-feed detection unit 41, and based on this elapsed time, the document is scanned in the transport direction (length direction). The distance from the leading edge to the detection position is calculated, that is, the position in the length direction on the document corresponding to the detection position of the multi-feed detection unit 41 is calculated. As a result, the reread control unit 52 grasps the position in the length direction of the multi-feeding portion on the document. In addition, the reread control unit 52 determines a double-feed position on the document depending on which of the multiple-feed detection units 41 arranged side by side in the width direction detects the double-feed. Figure out the widthwise position of. In addition, when the multi-feed is continuously detected in the length direction and the width direction from the leading edge to the end of the document, the re-reading control unit 52 selects one continuous multi-feed. May be determined as.

According to the present embodiment, as described above, the document reading device 5 includes the platen glass 20 (document table) on which the document is placed, the document transport unit 7 that transports the document to a predetermined reading position, and the document loading unit 7. For reading, an image reading unit 6 that reads an original placed on the platen glass 20 to obtain image data, and as conveyance reading, an image reading unit 6 that reads the original conveyed to the reading position by the original conveying unit 7 and obtains image data. , the double feed detection unit 41 for detecting the double feed of the document conveyed to the reading taken position, during the read and transport of a plurality of originals, if double-feed detection unit 41 detects the double feed of the document, feeding and reading Stop and enable re-reading by the placement scan for the multi-fed originals for which double feed was detected. A re-reading control unit 52 (control unit 50) that applies the acquired image data to the scanning operation results of a plurality of documents.

Further, according to the present embodiment, the document reading device 5 further includes an operation display unit 8 (operation unit) that receives a user's operation, and the reread control unit 52 (control unit 50) conveys and reads a plurality of documents. When the multi-feed detection unit 41 detects the multi-feed of the originals during the execution of the above, the conveyance reading is stopped, and the multi-feed originals for which the multi-feed is detected are re-read by either the placement reading or the conveyance reading. A user selection is input according to the operation of the operation display unit 8, and the multi-fed original is subjected to the placement reading or the conveyance reading according to the user selection, and then the conveyance reading of the original following the multi-feed original is continued. ..

Further, in the above-described embodiment, the reread control unit 52 has been described as an example of instructing to remove the document following the multi-fed document from the supply tray 30, but the present invention is not limited to this example. For example, in another embodiment, the re-reading control unit 52 (control unit 50) conveys the document without instructing to remove the document from the supply tray 30 when the user selection of the re-reading by the placement reading is input. Regardless of the placement of the original document on the supply tray 30 of the unit 7, the placement reading of the original document placed on the platen glass 20 may be preferentially executed.

Claims (4)

A document table on which a document is placed,
A document transport unit that transports the document to a predetermined reading position,
As the placement reading, the original placed on the original table is read to obtain image data, and as the conveyance reading, the original conveyed to the reading position by the original conveying unit is read to obtain the image data. And an image reading unit that
The original document transport unit includes a double feed detection unit that detects a double feed of the original document transported to the reading position,
When the double feed detection unit detects the double feed of the originals during the feeding and reading of the plurality of originals, the feeding and reading is stopped, and the double feed originals for which the double feeding is detected are placed. Enable re-reading by reading,
When re-reading is performed on the multi-fed original by the above-described placement scanning, the image data obtained by the above-described placement scanning of the multi-fed original is applied to a scanning operation result of a plurality of the originals. Document reader. Further provided with an operation unit for receiving a user operation,
When the double-feed detection unit detects the double-feed of the originals during the carrying-reading of the plurality of documents, the carrying-reading is stopped, and the double-feeding document in which the double-feed is detected is described above. User's selection of re-reading by either the stationary reading or the conveyance reading is input according to the operation of the operation unit,
2. The apparatus according to claim 1, wherein the multi-fed original is subjected to the above-mentioned position reading or the conveyance reading, and thereafter, the conveyance reading is continued for a document following the multi-feed original. The document reading device described. When the user's selection of re-reading by the document reading is input, the document reading on the document placed on the document table is performed regardless of the placement of the document on the supply tray of the document transport unit. The document reading apparatus according to claim 2, wherein the document reading apparatus is executed with priority. An image forming unit for forming an image,
The document reading device according to claim 1,
An image forming apparatus comprising:

Images