JP4869969B2 - Image reading apparatus and image forming apparatus - Google Patents

Image reading apparatus and image forming apparatus Download PDF

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JP4869969B2
JP4869969B2 JP2007026652A JP2007026652A JP4869969B2 JP 4869969 B2 JP4869969 B2 JP 4869969B2 JP 2007026652 A JP2007026652 A JP 2007026652A JP 2007026652 A JP2007026652 A JP 2007026652A JP 4869969 B2 JP4869969 B2 JP 4869969B2
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document
unit
feed
image
reading
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JP2008193470A (en
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晃宏 高田
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京セラミタ株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an image reader capable of processing overlapped-feed originals without bothering a user with manual work. <P>SOLUTION: A copying machine 1 carries an original from an original feeding tray 3 along a first carrying path R1, and transfers the original to an original standby part 94 through a second carrying path R2 and a third carrying path R3 when an overlapping feeding sensor 100 detects overlapping feeding. After all originals on the original feeding tray 3 are fed, the overlapped-feed original is returned to the original feeding tray 3 from the original standby part 94 and is carried again. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to an image reading apparatus that reads an image on a document, and a printing apparatus that prints the read image on a sheet.

  In the image reading apparatus, when two or more originals are conveyed in a superimposed manner, that is, when the originals are double-fed, it is necessary to read the image again for the double-fed originals.

  For example, the image reading apparatus disclosed in Patent Document 1 includes a multifeed detection unit that detects overlapping of documents, a platen, a scanner unit, a feeder unit that includes a paper feed stacker, a conveyance path, and a paper discharge stacker. The original set on the paper feed stacker is guided to the platen by the conveyance path, and after the image is read by the scanner unit on the platen, the original is discharged to the paper discharge stacker.

  For pages that have been transported normally, the data storage device stores the read image data. At this time, the data storage device also stores the page number (counter value) along with the data as additional information. On the other hand, when the double feed is detected by the double feed detection means, the page number of the double feed is stored, and the document determined to be double feed does not read the image or discards the read data. Pass the platen.

The image reading apparatus further includes a display unit, and the display unit displays a double-fed page. Based on this display, the user can set only the originals on the paper discharge stacker that have not been read by double feeding or all the originals on the paper feed stacker and press the start button. Thus, the image reading apparatus executes image reading again. At this time, the image reading apparatus conveys all the originals set on the paper feed stacker through the platen, but discharges the already read pages without performing the image reading. Then, the user arranges the page order for the obtained copy, and the operation is completed.
Japanese Patent Laying-Open No. 2005-244425 (published on September 8, 2005)

  In the above-described conventional technique, when double feeding occurs, image data cannot be obtained for the multi-fed original unless the user sets the double-fed original or all originals on the paper feed stacker.

  SUMMARY An advantage of some aspects of the invention is that it provides an image reading apparatus and an image forming apparatus that can further reduce the labor of a user.

In order to solve the above problems, the image reading apparatus according to the present invention provides, as a first means, a document supply tray on which a document bundle is placed, a document discharge tray from which a document bundle is discharged, and the document as the document. A main conveyance path that leads from the supply tray to the document discharge tray, and sequentially conveys the originals one by one along the main conveyance path; and an image on the original at a reading position on the main conveyance path. A reading unit to be read; a double feed detection unit for detecting double feed of the document on the main transport path; A sub-conveying unit that returns the sheet to the main conveying path one by one upstream from the reading position in the conveying direction.

  The image reading apparatus can automatically re-feed the double fed document to the reading position by the sub-conveying unit. That is, it is not necessary for the user to re-load the multi-feed original on the original supply tray, and the user's labor is reduced.

In the image reading apparatus of the present invention , as the second means, in the first means, the reading unit reads an image on the document from one direction with respect to the main transport path, and the double feed The detection unit detects a double feed of the document upstream from the reading position, and the sub-transport unit reads both sides even if the document is not detected as a double feed by the double feed detection unit. The document is retracted from the main conveyance path downstream from the reading position, and then the document is reversed with respect to the reading unit and returned to the main conveyance path, and the multifeed detection unit performs double feeding. The detected document is retracted from the main transport unit upstream of the reading position in the transport direction, and then returned to the main transport path without being inverted.

  According to the image reading apparatus, the mechanism for reversing the document to read both sides of the document and the mechanism for processing the multi-feed document are realized by one sub-conveying unit.

In the image reading apparatus of the present invention, in the first means or the second means, the sub-conveying unit detects the document detected by the multi-feed detecting unit as the document included in one job. Of these, the document may be returned to the main conveyance path after all the documents other than the documents detected to be overlapped by the double feed detection unit.

The image reading apparatus according to any one of the first to third means, a multifeed position storage unit for storing the position of the document detected as a multifeed in a document included in one job, and the image reading An image storage unit that stores an image of each original read by the apparatus, an image forming unit that visualizes an image based on the storage of the image storage unit, a control unit that controls the operation of the image forming unit, And the control unit reads a document that has been double-feed detected by the double-feed detection unit based on the storage in the multi-feed position storage unit and is returned to the main transport path by the sub-transport unit. An image forming apparatus configured to control the image forming unit so that an image of a prepared document is visualized by inserting it into a corresponding position between images of other documents included in the same job is also provided in this book. Included in the invention.

  The image reading apparatus and the image forming apparatus can automatically re-feed the fed documents to the reading position by the sub-conveying unit. That is, it is not necessary for the user to re-load the multi-feed original on the original supply tray, and the user's labor is reduced.

  Hereinafter, a copying machine 1 according to an embodiment of the present invention will be described in detail with reference to the drawings. Hereinafter, unless otherwise specified, the terms “upper” and “lower” indicate the upper and lower positions in the installation posture of the apparatus.

I. First Embodiment [1] Main Configuration of Copying Machine 1 FIG. 1 is a front view showing the main configuration of the copying machine 1. As shown in FIG. 1, the copying machine 1 includes a document conveying device 2, an image reading unit 102, an image forming unit 103, a sheet conveying unit 150, sheet storage units (122, 123, 131), and the like. It can be said that the document conveying device 2 functions as an image reading device together with the image reading unit 102.

  The image reading unit 102 reads an image of a document and generates digital data of the image. The image reading unit 102 includes an original platen 104 and a platen 140 made of a transparent plate such as contact glass provided on the upper surface of the casing, and a scanning optical system 105 disposed below the original platen 104.

  The scanning optical system 105 includes a first carriage 106, a second carriage 107, a condenser lens 108, an image sensor 113, and the like. The first carriage 106 is provided with a linear light source 109 and a mirror 110, and the second carriage 107 is provided with mirrors 111 and 112. A light source 109 illuminates the document. The mirrors 110, 111, and 112 guide reflected light from the original to the lens 108, and the lens 108 forms an optical image on the light receiving surface of the line image sensor 113. In the scanning optical system 105, the first carriage 106 and the second carriage 107 are provided so as to be able to reciprocate in the sub-scanning direction 114. By moving the first carriage 106 and the second carriage 107 in the sub-scanning direction 114, the image of the document placed on the document table 104 can be read by the image sensor 113. The image sensor 113 generates document image data from the light image incident on the light receiving surface.

  Note that a document automatically conveyed by a document conveying device 2 to be described later is read by a scanning optical system 105 held under the platen 140 at a document reading position 139 on the platen 140.

  The image forming unit 103 prints image data obtained by the image reading unit 102 or image data received from another device through a network via a network adapter (not shown) on the paper P. In the image forming unit 103, a photosensitive drum 115 that rotates at a constant speed in an arrow direction 116 is provided, and around the photosensitive drum 115, in order from the upstream side in the rotation direction, a charger 117, an exposure unit 118, and a developing unit. 119, a transfer device 120, and a cleaning unit 121 are arranged. The charger 117 uniformly charges the surface of the photosensitive drum 115. The exposure device 118 irradiates the uniformly charged surface of the photosensitive drum 115 with light according to the image data to form an electrostatic latent image on the photosensitive drum 115. The developing device 119 forms a toner image on the photosensitive drum 115 by attaching toner to the electrostatic latent image. The transfer device 120 transfers the toner image on the photosensitive drum 115 to the paper P. The cleaning unit 121 cleans the surface of the photosensitive drum 115 by removing waste toner remaining on the surface of the photosensitive drum 115 from the photosensitive drum 115 after the transfer. These processes are performed in a series as the photosensitive drum 115 rotates.

  The manual feed tray 131 and the paper feed cassettes 122 and 123 can place or store various sizes of paper.

  The paper transport unit 150 includes a paper feed roller 124, a paper transport roller 125, a registration roller 126, a separation roller 152, and the like. The transport unit 150 selects a sheet specified by the user or a sheet according to the size of the automatically detected document, and pulls out the selected sheet one by one from the manual feed tray 131 and the cassettes 122 and 123 by the sheet feeding roller 124. At this time, the separation roller 152 that functions as a pair with the paper transport roller 125 applies frictional force to the paper to prevent paper multi-feeding (conveying a plurality of papers in a stacked state). The drawn paper is transported by the transport roller 125, and then the registration roller 126 is timed so that the toner image on the photosensitive drum 115 is transferred onto the paper P, and the paper P is transferred to the transfer device 120 and the photosensitive drum. It sends in between 115. The sheet P to which the toner image is transferred is conveyed to the fixing device 127. The fixing device 127 includes a fixing roller 128 and a pressure roller 129, and fixes the toner image on the paper P by heat and pressing force. The image forming unit 103 discharges the paper P that has passed through the fixing device 127 to the paper discharge tray 130.

[2] Document feeder 2
FIG. 2 is a front view illustrating a configuration of a main part of the document conveying device.

  The document conveying device 2 includes a document supply tray 3 on which a document is placed, and a document discharge tray 5 on which a document after an image is read by the scanning optical system 105 is discharged. The document transport device 2 includes a first transport path (main transport path) R1 from the document supply tray 3 through the document reading position 139 to the document discharge tray 5. The document transport device 2 further includes a separation sheet feeding unit 7 that feeds documents from the document supply tray 3 to the first conveyance path R1, and a main sheet that conveys documents from the separation sheet feeding unit 7 along the first conveyance path R1. Conveyance roller group (81-84), sub-conveying section 9 that retracts the original from the first conveyance path R1 and performs reversal of originals and processing of double-fed originals, first to fourth switches (Sw1-Sw4) for detecting originals ), And a double feed sensor 100 for detecting double feed of the document. Other members will be appropriately described below.

  In the present embodiment, the document is placed on the document supply tray 3 with the surface to be read facing up. Hereinafter, the upper surface when first placed on the document supply tray 3 is referred to as a first surface, and the back surface thereof is referred to as a second surface. Hereinafter, there are n originals placed on the original supply tray 3, and the originals may be expressed as M1 to Mn in order from the top.

  The separation paper feeding unit 7 includes a forward feed roller 71 and a paper feed roller 72 in this order from the document supply tray 3 toward the first transport path R1, and further, an elevating unit 73 that functions in pairs with the forward feed roller 71. A separation roller 74 that functions as a pair with the paper feed roller 72 is provided.

  The forward feed roller 71 is disposed above the document supply tray 3. The elevating unit 73 includes an elevating plate 73a that can move up and down, and an elevating plate driving unit 73b that drives the elevating plate 73a up and down. The elevating plate 73 a is arranged so as to face the forward feed roller 71 and sandwich the original on the original supply tray 3 between the forward feed roller 71. The elevating plate driving unit 73b drives the elevating plate 73a to lift the document, thereby bringing the document into contact with the forward feed roller 71. At this time, since the forward feed roller 71 contacts the uppermost document in the document bundle, the document can be pulled out from the upper side of the document bundle and sent to the paper feed roller 72. It is assumed that the forward feed roller 71 can rotate both forward and reverse.

  The paper feed roller 72 feeds the original fed by the forward feed roller 71 to the first transport path R1. The separation roller 74 is disposed so as to be in sliding contact with the paper feed roller 72. The separation roller 74 is driven and rotated by the paper feed roller 72 while generating a rotational resistance corresponding to the pressure from the paper feed roller 72 side, thereby separating the originals one by one. In this way, so-called double feeding of conveying two or more originals is prevented. The paper feed roller 72 can also rotate in both forward and reverse directions.

  The registration roller 75 is configured to temporarily stop the conveyed document. Therefore, for example, a document conveyed by the paper feed roller 72 is deflected before the registration roller 75. Then, the feeding roller 72 stops rotating in a state where the deflection occurs, and then the registration roller 75 starts conveying the document, thereby aligning the leading ends of the documents. The registration roller 75 can also rotate in both forward and reverse directions.

  Normally, the document is sent from the registration roller 75 through the first transport path R1 to the document reading position 139 through the first transport roller 81 and the second transport roller 82. However, on the downstream side of the registration roller 75 and the upstream side of the first conveyance roller 81, the second conveyance path R2 branched from the first conveyance path R1, and the first branch for switching between the first conveyance path R1 and the second conveyance path R2. A lever L1 is provided, and the document may be sent to the second transport path R2. The second transport path 2 constitutes the sub transport section 9 by the third and fourth transport paths (R3, R4), other levers, rollers, and the like. Details of the sub-transport unit 9 will be described later.

  The main conveyance roller group includes a registration roller 75, a first conveyance roller 81, and a second conveyance roller 82 from the side closer to the separation sheet feeding unit 7 toward the document reading position 139 along the first conveyance path R1. An intermediate roller 83 and a discharge roller 84 are provided in this order from the document reading position 139 toward the document discharge tray 5. In addition, rollers that are paired with the respective rollers (81 to 84) are also provided, and these paired rollers are slidably in contact with the respective rollers (81 to 84).

  The document whose image has been read by the scanning optical system 105 is normally conveyed to the intermediate roller 83 so as to pass through the first conveyance unit R1. Then, the paper is finally discharged to the original discharge tray 5 by the discharge roller 84. However, downstream of the intermediate roller 83 is provided with a fifth transport path R5 that branches from the first transport path R1, and a second branch lever L2 that switches between the first transport path R1 and the fifth transport path R5. The document may be sent to the fifth transport path R5. The fifth transport path R5 is connected from the intermediate roller 83 to the registration roller 75 described above.

  The first to third switches (Sw1 to Sw3) will be briefly described below. The first switch Sw1 is turned on when the upper document is detected from the document supply tray 3 through the first conveyance path R1. The second switch Sw2 is provided at a branch point between the first conveyance path R1 and the second conveyance path R2, and detects the passage of a document sent from the registration roller 75 toward the first conveyance roller 81 or the reverse roller 91. Turns on. The third switch Sw3 is turned on when the passage of the document is detected between the first transport roller 81 and the document reading position 139 on the first transport path R1.

  The double feed sensor 100 is provided along the first transport path R1 between the paper feed roller 72 and the branch point between the first transport path R1 and the second transport path R2. In the present embodiment, the double feed sensor 100 is particularly provided between the paper feed roller 71 and the registration roller 75. The double feed sensor 100 includes an optical sensor unit or the like, detects the amount of light passing through the document, and indicates an output value corresponding to the amount of transmitted light. The double feed detection mechanism of the double feed sensor 100 is not limited to a specific configuration.

  Next, the sub-transport portion 9 and its peripheral members will be described.

  As shown in FIG. 2, the sub-transport unit 9 includes second to fourth transport paths (R2 to R4), a reversing roller 91, multi-feed processing rollers 92 and 93, a multi-feed document standby unit 94, and a third branch lever L3. And a fourth branch lever L4.

  The reverse roller 91 can rotate in both forward and reverse directions. The reversing roller 91 rotates in the forward direction so that the document conveyed on the first conveyance path R <b> 1 can be drawn into the second conveyance path 32.

  The third transport path R3 is provided so as to guide the document from the reverse roller 91 to the multi-feed document standby unit 94.

  The fourth branch lever L4 can switch whether the document fed upward in FIG. 3 by the reverse roller 91 from the second transport path R2 is sent to the multifeed roller 92 or stopped without being sent.

  The multi-feed processing rollers 92 and 93 are arranged in this order from the reversing roller 91 to the multi-feed original standby section 94 along the third conveyance path R3. The double feed processing rollers 92 and 93 can also rotate in both forward and reverse directions. The double feed processing rollers 92 and 93 rotate in the forward direction to transport the document from the reversing roller 91 to the document standby unit 94 through the third transport path R3, and rotate in the reverse direction to rotate the third transport path R3. The document can be conveyed from the document standby unit 94 to the reverse roller 91 through the reverse. The document sent from the document standby unit 94 is detected by the switch Sw4.

  The document standby unit 94 has a space for temporarily storing double-fed documents.

  The fourth transport path R4 guides the document from the reverse roller 91 to the first transport roller 81. That is, it can be said that the third transport path R3 is branched into the second transport path R2 and the fourth transport path R4 on the opposite side of the reverse feed roller 91 from the double feed processing roller 92. A third branch lever L3 is provided at this branch point. The third branch lever L3 switches the path through which the document fed from the multi-feed processing roller 92 passes between the fourth transport path R4 and the second transport path R2.

  In order to send the document from the document standby unit 94, a mechanism such as the lifting plate 73a and the lifting plate driving unit 73b described above may be provided.

[3] Drive System and Control System Next, a drive system and a control system related to the document transport operation in the copying machine 1 will be described with reference to FIGS. FIG. 3 is a block diagram showing a main part configuration of the copying machine 1, and FIG. 4 is a block diagram drawn around the control device 30 in the copying machine 1.

  As shown in FIG. 3, in addition to the members described in the columns [1] and [2], the copying machine 1 accepts an instruction from the user, an acceptance content of the acceptance part 20, and outputs of various sensors. A control device 30 that controls the operation of each part of the copying machine 1 according to the above, a paper feed drive unit 61 that drives a roller that can rotate in both forward and reverse directions, such as the forward feed roller 71, as a drive unit of the document conveying device 2, A conveyance drive unit 62 that drives the main conveyance roller group (81 to 84), a branch lever drive unit 63 that drives the first to fourth branch levers, and the like are provided.

  The reception unit 20 includes a hard key, a display screen, and the like. The accepting unit 61 accepts an input from the user via this hard key or a soft key displayed on the display screen.

  The paper feed driving unit 61 drives the forward feed roller 71, the paper feed roller 72, the registration roller 75, the reverse roller 91, the double feed processing rollers (92, 93) and the like under the control of the control device 30. The paper feed driving unit 61 may drive each roller in the same direction at once, or may drive each roller separately or in different directions. For example, the paper feed driving unit 61 can appropriately drive each roller by appropriately including a motor and a clutch disposed between the motor and each roller.

  The branch lever driving unit 63 switches the document transport path by individually driving the first to fourth branch levers L1 to L4 under the control of the control device 30.

  Each drive part (61-63) may be provided with a some drive mechanism, for example, a motor, a solenoid, etc., respectively.

  An overview of the control device 30 will be described with reference to the block diagram of FIG. The control device 30 includes a document conveyance control unit 31, a page counter 32, an image data storage unit 33, an image processing unit 34, a double feed position storage unit 35, an image formation control unit 36, and the like.

  The document conveyance control unit 31 controls each unit of the document conveyance device 2 to execute normal conveyance, multi-feed document processing, document reversal, and the like.

  The page counter 32 counts the number of documents sent out from the document feed tray 3 by counting the number of times the first switch Sw1 is turned on. The page counter 32 adds 1 to the count result when the double feed detection sensor 100 detects double feed.

  The image data storage unit 33 can store image data obtained by appropriately processing a signal from the scanning optical system 105 by a processing device (not shown). The image data of each document is associated with the page number of the document (numerical value indicated by the page counter 32). At this time, for example, the page number can be stored together as additional information (header information) of the image data.

  The image data processing unit 34 appropriately processes the image data in the image data storage unit 33 based on the stored content of the double feed position storage unit 35 and the received content of the reception unit 20 to generate print data.

  The image forming unit 103 visualizes the printing data generated by the image processing unit 34 and prints it on a sheet.

  Based on the output from the double feed sensor 100 and the number of the page counter 32, the double feed position storage unit 35 determines the position of one of the double fed originals in the original bundle, that is, the page number of the double fed original. Remember if there is.

  The image formation control unit 36 controls the image forming unit 103 and the paper transport unit 150 to execute printing.

[4] Copying Operation An example of the copying operation will be described below with reference to the flowcharts of FIGS. 5 to 10 together with the block diagrams of FIGS.

(4-1) Overview of Copying Operation An overview of copying operation will be described with reference to FIG. As shown in FIG. 5, the copying operation mainly includes the image acquisition step (S1), the image processing step (S2) for appropriately processing the image obtained in the image acquisition step S1, and the print data obtained in the image processing step S2. A printing step (S3) for printing on the paper is included.

(4-2) Image acquisition step S1
The image acquisition step will be described with reference to FIG.

  When it is detected by a sensor (not shown) that the document is placed on the document supply tray 3, the control device 30 causes the document transport control unit 31 to control the lifting plate driving unit 73b to raise the lifting plate 73a ( S101). Further, the document conveyance control unit 31 controls the paper feed driving unit 61 to rotate in the forward direction a roller that can rotate in both forward and reverse directions, such as the forward feed roller 71 (S102). That is, the document conveyance control unit 31 conveys the document along the first conveyance path R1. Then, as the document passes, the page counter 32 counts the number of pages as described above (S103).

  Here, if the output value c of the double feed sensor 100 becomes larger than the reference value V due to the passage of the original, it means that the original is one sheet (not the double feed), so the original conveyance control unit 31 performs normal image reading. The document conveying device 2 is controlled so as to perform (No in S104 → S106). This “normal image reading” will be described later with reference to FIG.

  On the other hand, if the output value c is equal to or less than the reference value V, it means that the documents are overlapped (double feed), and therefore the document transport control unit 31 causes the document standby unit 94 to retract the document so that the document transport device 2 is retracted. (Yes in S104 → S107). The document evacuation operation will be described later with reference to FIG. 8 in the section (4-3) below.

  The control device 30 controls each unit as described above, and continues this series of operations for all the documents on the document supply tray 3, that is, until there is no document on the document supply tray 3 (S107). Judgment). When there are no more documents on the document supply tray 3, the page counter 32 is reset (S108).

  If any of the originals are double-fed, after the originals disappear from the original supply tray 3, the double-fed originals are fed again and the image reading is performed again (Yes in S109 → S110). On the other hand, if double feeding does not occur and all the originals are normally conveyed (No in S109), the image acquisition operation is terminated without performing the operation of step S110.

  Note that the control device 30 can detect whether or not the document on the document supply tray 3 runs out, for example, by turning on / off the first switch Sw1. That is, as shown in FIG. 6, when the first switch Sw1 is turned from OFF to ON by the forward rotation of the forward feed roller 71 or the like (Yes in S107), the control device 30 is still on the document supply tray 3. Since the document remains, if the first switch Sw1 remains OFF (No in S107) even if the operation after step S102 is repeated and the forward feed roller 71 and the like are driven to rotate in the forward direction, the document Since no original remains on the supply tray 3, the process may proceed to step S108. Of course, in addition to the first switch Sw1, other sensors for detecting the document itself on the document supply tray 3 may be provided.

(4-3) Normal image reading step S106
The normal image reading step S106 will be specifically described with reference to FIG.

  In the normal image reading step, the control device 30 first drives the main transport roller group (81 to 84) by the document transport control unit 31 (S201). At this time, the first branch lever L1 is turned OFF. In this way, the document is sent to the first transport path R1 by the registration rollers 75, and further transported along the first transport path R1 by the main transport rollers 81 to 82 (in FIG. 2, the direction of travel of the document is indicated by a hollow arrow). ). The document passes through the reading position 139 with the first surface facing down, that is, with the first surface facing the scanning optical system 105, and is read by the optical scanning system 105 (S202). The optical scanning system 105 is operated by a reading control unit (not shown) included in the control device 30 based on the detection result of the third switch Sw3 and the like so that the document operates in synchronization with the timing when the document passes the reading position 139. Be controlled.

  The control device 30 has a single-sided reading mode for reading only the first surface and a double-sided reading mode for reading both the first surface and the second surface. Which mode is executed depends on the content of the instruction from the user received by the receiving unit 20 in advance.

  In the single-sided reading mode, the document conveyance control unit 31 keeps the second branch lever L2 OFF, so that the document whose first surface has been read as described above is directly transferred to the first conveyance path by the intermediate roller 83. The paper is discharged to the document discharge tray 5 by the discharge roller 84 through R1 (Yes in S203 → S209).

  On the other hand, in the duplex reading mode, the document conveyance control unit 31 drives the branch lever driving unit 63 to turn on the second branch lever L2 and the first branch lever L1 (No in S203, S204, S205). In this way, the document enters the fifth transport path R5 from the first transport path R1 by the intermediate roller 83, and then enters the second transport path R2 through the transport of the registration rollers 75 (the direction of travel of the document is shown in FIG. 2). (Indicated by an arrow with a middle diagonal line). At this time, since the document conveyance control unit 31 keeps the fourth branch lever L4 OFF, the document is sent to the third conveyance path R3 by the reverse roller 91, but does not reach the document standby unit 94.

  Here, the document conveyance control unit 31 controls the paper feed driving unit 61 to drive the reverse roller 91 in the reverse direction (S206). At this time, the document conveyance control unit 31 keeps the third branch lever L3 OFF. Accordingly, the document enters the fourth transport path R4 from the third transport path R3. Since the fourth transport path R4 joins the first transport path R1 upstream of the first transport roller 81, the document is returned to the first transport path R1. At this time, the orientation of the original when the first side is read is reversed. The document is conveyed by the conveyance rollers 81 and 82, and the second surface is read at the reading position 139 in the same manner as the first surface (S207). The document conveyance control unit 31 controls the branch lever driving unit 63 to switch the second branch lever L2 to OFF (S208). Thus, the document is discharged to the document discharge tray 5 through the first transport path R1 (S209).

  The image data storage unit 33 stores the image data obtained as described above together with the page number as described above (S210).

(4-4) Document evacuation step S105
The document evacuation step S105 will be described with reference to FIG.

  If the determination in step S104 is Yes due to the occurrence of double feed, the double feed position storage unit 35 stores the numerical value indicated by the page counter 32 at that time (S301). This numerical value corresponds to the page number of the first sheet of the double-fed document. Next, as described above, 1 is added to the count value of the page counter 32 (S302). By doing so, the numerical value of the page counter 32 is corrected so as to match the number of documents actually conveyed. The double feed position storage unit 35 may similarly store this numerical value obtained by adding 1 to the count numerical value (corresponding to the second page number of the double-fed original), but is not essential.

  On the other hand, the document conveyance control unit 31 turns on the first branch lever L1 and the fourth branch lever via the branch lever driving unit 63 (S303, S304). By these controls, the document is guided from the first transport path R1 to the second transport path R2, and is stored in the document standby section 94 through the third transport path R3 (the progress direction of the document is black in the figure). Indicated by an arrow). At this time, in the document standby section 94, the order of the documents and the front and back of each document are reversed from when they are placed on the document supply tray 3. That is, when the k-th original Mk and the (k + 1) -th original Mk + 1 are first fed on the original supply tray 3 in the original standby unit 94, the originals are Mk and Mk + 1 in order from the bottom. In sequence, the back surface (second surface) is placed on top of each other.

  When the evacuation of the original is completed (Yes in S305), the first branch lever L1 and the fourth branch lever L4 are quickly turned off to prepare for the next conveyance of the original.

(4-5) Refeeding and reading step S110
Step S110 for refeeding and reading the double fed document will be described with reference to FIG.

  If it is determined in step S107 described above that there is a double-fed document in the document of the job being executed, the document conveyance control unit 31 turns on the third branch lever L3 via the branch lever drive unit 63 ( S401). In this state, the document conveyance control unit 31 causes the paper feed driving unit 61 to drive the double feed processing rollers 92 and 93 and the forward feed roller 71 in the reverse direction (S402).

  The double feed processing rollers 92 and 93 take out the document from the upper side in the document standby unit 94 and transport it along the third transport path R3. Then, the document is sent to the registration roller 75 by the reverse roller 91 via the second conveyance path R2. The document is further transported from the registration roller 75 further upstream (upstream when the registration roller 75 rotates in the forward direction) so as to go back along the first transport path R1 and is placed on the document supply tray 3. The direction of travel of the document is indicated by dotted arrows in the figure. The document conveyance device 2 performs the conveyance in the reverse direction as described above until the document standby unit 94 becomes empty, that is, until the fourth switch Sw4 is not turned on (until No in step S403). Controlled by the document conveyance control unit 31. At this time, the originals are stacked on the original supply tray 3 in the original order, that is, in order of Mk + 1 and Mk from the bottom with the front surface (first surface) facing up.

  When the document standby section 94 becomes empty in this way, the same processing as the image acquisition step S1 described in the section (4-2) is executed again (S404). In other words, the document transport device 2 returns the document from the document standby unit 94 to the document supply tray 3 and transports the document again (re-feeding), and the scanning optical system 105 performs a reading operation.

(4-6) Image processing step S2
The image processing step 2 will be described with reference to FIG. When document multi-feeding occurs in one job, the multi-feed manuscript that has been re-fed and read in step S110 is inserted into an appropriate position (Yes in S501 → S502). On the other hand, if double feeding has not occurred, other image processing such as image enlargement / reduction is performed (No in S501 → S503).

  The image processing in step S502 will be described with reference to FIG. FIG. 11 is a diagram illustrating the order of documents on the document supply tray 3, the order of reading, and the order of printing.

  In FIG. 11, it is assumed that the number of documents is 8 (M1 to M8), of which the documents M3 and M4 and M6 and M7 are double-fed (the left line in FIG. 11). Then, these originals are fed again after the originals that have been normally conveyed. An image read and fed again is shown in FIG. 11 with hatching. From the page numbers assigned to the normally conveyed originals, the page numbers of the double-fed originals are missing due to the processing in steps S302 and S210 (center line in FIG. 11).

  The image data processing unit 34 rearranges the images in an order that matches the placement order on the document supply tray 3 based on the stored contents of the multifeed position storage unit 35. Specifically, the image data processing unit 34 counts the original image stored in the image data storage unit 33 after being re-supplied, and the count result of the page counter 32 indicating how many times the original is re-supplied. Based on (numerical values shown in italics in the center line of FIG. 11), the page number of the multi-fed original between the images of the normally conveyed original (the number stored in S301 and the number obtained by adding 1 to the number). Inserted in order at the position corresponding to brackets in the center line of FIG.

  Based on the printing data generated in this way, printing by the image forming unit 103 is executed under the control of the image forming control unit 36 as described above for step S3.

  There is no particular limitation on how the control device 30 determines whether or not a document double feed has occurred in one job. For example, the control device 30 may determine whether or not there is a double feed depending on whether the double feed position storage unit 35 stores the double feed position, or based on the output value of the double feed sensor 100, Means for storing presence / absence may be provided.

  The copying machine 1 may include a storage device such as a hard disk (not shown), and the storage device may store a series of image data after rearrangement in step S502. In this way, the copying machine 1 can read out an image from the hard disk later and perform reprinting or the like.

  Further, as can be seen from the above description, the separation paper feeding unit 7 can function as a main conveyance unit that performs normal conveyance together with the main conveyance roller group (81 to 84), or cooperates with the sub conveyance unit 9. It is also possible to work on the re-conveyance of double-fed documents. In addition, the portion of the first transport path R1 from the paper feed roller 72 to the registration roller 75, the fifth transport path R5, and the branch levers L1 to L4 also cooperate with the sub transport section 9 to process multi-feed documents. Or it can carry the conveyance at the time of double-sided reading.

  Even if not specifically mentioned, each of the branch levers L1 to L4 is normally OFF, and the document conveyance control unit 31 switches each branch lever to ON via the branch lever drive unit 63, and then It is preferable that when the target document passes through the branch point provided with the branch lever, it is quickly switched to OFF. By doing so, it is possible to prevent the document conveying device 2 from conveying the next document in an inappropriate direction.

  In this embodiment, the multi-fed original is fed again after there is no original on the original supply tray 3, but the present invention is not limited to this. For example, when a double feed is detected, the conveyance of the next original may be interrupted, and the double-fed original may be separated, retransmitted, and read before the next original is conveyed.

  In the present embodiment, the document feeder 2 returns the double-fed original to the original paper feed tray 3 and re-feeds it. However, the present invention is not limited to this, and the multi-fed original is fed. As long as it can be separated and sent to the reading position 139, that is, it can be returned to the original conveyance path upstream from the reading position 139.

  In the present embodiment, the document conveying device 2 retreats the double-fed document from the first conveying path R1 at a branch point near the registration roller 75 upstream from the reading position 139. However, the present invention is not limited to this, and the multi-fed original may be retracted from the first conveyance path 139 downstream of the reading position 139. However, in the overlapped state, not only the lower original (the second of the two fed originals) but also the upper original (the first of the two fed originals) Also, since there is a possibility that a reading failure may occur, the reading is performed again in order to obtain a good image. For this reason, it is preferable to retract the double-fed document upstream of the reading position 139 in order to avoid the two reading operations.

  Each block of the copying machine 1, in particular, the control device 30 can be configured by hardware logic or can be realized by software. That is, the copying machine 1 includes a CPU (central processing unit) that executes instructions of a control program for realizing the function of each block, a ROM (read only memory) that stores the control program, and a RAM that expands the control program. (Random access memory), a storage device such as a memory for storing the control program and information related to control may be provided. In other words, the function of each block can be achieved in the copying machine 1 when a computer such as a CPU reads and executes the program code recorded on the recording medium.

1 is a front view showing a main part configuration of a copying machine 1 according to an embodiment of the present invention. FIG. 2 is a front view showing a configuration of a main part of the document feeder 2 of the copying machine 1. FIG. 2 is a block diagram showing a main part configuration of the multifunction machine 1. FIG. 3 is a block diagram showing a configuration of main parts centering on a control device 30 of the multifunction machine 1. 6 is a flowchart showing a copying operation of the copying machine 1. 6 is a flowchart showing details of image acquisition step S1 of the copying operation. The flowchart which shows the detail of normal image reading step S106 contained in the said image acquisition step S1. 7 is a flowchart showing details of a document saving step S105 included in the image acquisition step S1. 7 is a flowchart showing details of a refeed and reading step S110 included in the image acquisition step S1. 12 is a flowchart showing details of image processing step S2 in the copying operation. 6 is a diagram showing the order of documents on the document supply tray 3, the order of reading, and the order of printing output.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Copier 2 Original conveying apparatus 3 Original supply tray 5 Original discharge tray 9 Sub conveying part 71 Forward feed roller 72 Paper feed roller 75 Registration roller 81-84 Main conveying roller group R1 First conveying path (main conveying path)
R2 to R5 Second to fifth transport path 139 Reading position 100 Double feed sensor (double feed detection unit)
DESCRIPTION OF SYMBOLS 102 Image reading part 103 Image forming part 30 Control apparatus 31 Document conveyance control part 32 Page counter 33 Image data storage part (image storage part)
34 Image data processing section

Claims (2)

  1. A document supply tray on which a bundle of documents is placed;
    A document discharge tray for discharging a bundle of documents;
    A main conveyance path that is a first conveyance path that guides the document from the document supply tray to the document discharge tray, and sequentially conveys the documents one by one along the main conveyance path;
    A reading unit that reads an image on a document from one direction with respect to the main conveyance path at a reading position on the main conveyance path ;
    A double feed detector for detecting double feed of the document on the main transport path upstream from the reading position ;
    The multifeed detector by double feed is detected document is retracted from the main transport path, and a sub-transfer section back upstream from the reading position one by one to the main transport path in the transport direction of the main transfer section
    With
    The sub-transport unit is
    A second conveyance path branched from the main conveyance path on the upstream side of the reading position and on the downstream side of the double feed detection unit;
    A reverse roller that is transported along the main transport path and draws the document guided to the second transport path into the second transport path;
    A third transport path for guiding the document from the reversing roller to a multi-feed document standby unit for temporarily storing the multi-feed document;
    A fourth conveyance path for guiding the document from the reverse roller to the main conveyance path on the upstream side of the reading position;
    With
    The sub-transport unit is
    Documents that are not detected as double-feed by the double-feed detection unit and are read from both sides with respect to the reading unit, and are guided downstream from the reading position to the second conveyance path from the main conveyance path The reversing roller is rotated forward and sent to the third conveying path via the second conveying path to retract the document from the main conveying path, and then the reverse roller is rotated reversely to the fourth conveying path. The document is reversed by returning the document to the main transport path through the path,
    When the double feed detection unit detects double feed, the reversing roller is rotated forward to feed the original to the third transport path through the second transport path and to the multi-feed original standby section. The multi-feed original standby section by reversely rotating the reversing roller after all the originals other than the original that are temporarily stored and included in one job other than the original detected by the multi-feed detection section. The originals stored in the paper are returned to the main transport path one by one through the second transport path, so that the originals are moved to the main transport path upstream from the reading position without being reversed with respect to the reading unit. An image reader that returns sheets one by one .
  2. An image reading apparatus according to claim 1;
    A multi-feed position storage unit that stores the position of a document in which multi-feed is detected in a document included in one job;
    An image storage unit for storing an image of each document read by the image reading device;
    An image forming unit that visualizes an image based on the storage of the image storage unit;
    A control unit for controlling the operation of the image forming unit,
    The control unit is a document in which double feed is detected by the double feed detection unit based on the storage in the double feed position storage unit, and is returned to the main transport path by the sub transport unit and read. The image forming apparatus is configured to control the image forming unit so that the image is inserted into a corresponding position between images of other documents included in the same job and visualized.
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JP4780182B2 (en) * 2008-11-27 2011-09-28 コニカミノルタビジネステクノロジーズ株式会社 Image reading device
JP2010136274A (en) * 2008-12-08 2010-06-17 Kyocera Mita Corp Image reader and image forming apparatus
JP5202399B2 (en) * 2009-03-13 2013-06-05 株式会社Pfu Image reading apparatus, image reading method, and program
JP5251652B2 (en) * 2009-03-23 2013-07-31 沖電気工業株式会社 Form image filing system
JP5075891B2 (en) * 2009-09-14 2012-11-21 株式会社東芝 Character reader
JP5211003B2 (en) * 2009-09-18 2013-06-12 京セラドキュメントソリューションズ株式会社 Image reading apparatus and image forming apparatus
JP5790080B2 (en) * 2011-03-30 2015-10-07 富士通株式会社 Meal image analysis method, meal image analysis program, and meal image analysis apparatus
JP5621800B2 (en) * 2012-02-23 2014-11-12 ブラザー工業株式会社 Document reader

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