JP4227559B2 - Image forming apparatus and image reading apparatus - Google Patents

Description

The present invention relates to images forming apparatus and an image reading equipment Ru provided with originals feeding means.

In recent years, in this type of image forming apparatus and image reading apparatus , a read original is stored in a memory or the like as image data, and copied by the image forming apparatus or connected to the image reading apparatus via a network When transmitting to (PC), it is possible to call up image data from a memory or the like to realize a desired operation.

Further, as an example of an automatic document feeder used in recent image forming apparatuses and image reading apparatuses , a document placing table, a paper discharge tray, a document separating unit disposed on one side of the scanner body, a document conveying unit and a discharge unit are provided. Regardless of single-sided or double-sided originals, there is known a flow-reading type in which an image is read while an original is transported while fixing an optical system, regardless of whether the original is a single-sided document or a double-sided document. Such an automatic document feeder is controlled so that a plurality of documents are conveyed through the automatic document feeder at a certain interval in order to shorten the exchange time of the document being read and the next read document. ing.

  When a jam (JAM: paper jam) occurs in the automatic document feeder as described above, a plurality of documents are accumulated in the automatic document feeder. At this time, the user takes out the jammed document with the automatic document feeder and clears the jam, and again places the document on the document table from the first page and restarts the reading operation.

  Also, even when a jam occurs in the image forming apparatus while the automatic document feeder reads and conveys the document, the document being conveyed in the automatic document feeder is discharged to the paper discharge tray and has not yet been read. The original remains on the original table, and the original bundle is separated. At this time, the user removes the jammed sheet in the image forming apparatus and clears the jam, and loads the original bundle separated on the original placement table and the discharge tray again from the first page of the original to the original placement table. To resume the copying operation.

In such a conventional image forming apparatus and image reading apparatus , it is known that after the jam processing, the counter value of the read image is memorized, and the counter value after the refeed is not read (for example, (See Patent Document 1).

In addition, when the jam occurs in the automatic document feeder, the number of documents to be returned is displayed, and when the copying operation is resumed, a document that has already been read due to an operator error and that does not need to be returned is fed. It is also known that when placed on a paper tray, the image information stored before the occurrence of the jam is compared with the image information read after the occurrence of the jam, and if they are the same document, no copying is performed. (For example, refer to Patent Document 2).
Japanese Patent Laid-Open No. 2000-98821 JP-A-9-236950

However, in the conventional image forming apparatus and image reading apparatus as described above, when the reading operation is not performed for the counter value, even if the original returned to the original mounting table again due to an operator's operation error is different, However, there is a problem that a desired copy cannot be made without being read. Also, when the number of documents is displayed and the copying operation is resumed, copying is continued even if a manuscript with a different image information is placed because of an operator's operation error. There was a problem that could not make a copy of.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems. An image forming apparatus and an image reading apparatus capable of reducing a document setting error of an operator after a jam and preventing a wasteful document reading operation or image forming operation. The purpose is to provide.

The present invention has been made to solve the above-described problems, and includes the following configuration.

(1) A stacking unit that stacks a bundle of documents, a document feeding unit that feeds documents one by one from the bundle of documents stacked on the stacking unit, and a reading that reads a document fed by the document feeding unit means and said fed by the document feeding means, the reading and storing means for storing the first document image is read by means, image that forms the image type of the document image read by said reading means on the sheet and forming means, said image forming means or a jam occurs in the document feeding means after release of the jam, performs feeding of the document by the document feeding means, when taking reading the original by said reading means, said or the same document by fed by the original feeding unit the original picture image stored in the storage means and after release of the jam is compared with the first original image is read by the reading means decision An image forming apparatus characterized by comprising a warning means for issuing a warning if it is not the same document.

(2) A stacking unit for stacking document bundles, a document feeding unit for feeding documents one by one from the bundle of documents stacked on the stacking unit, and a reading for reading a document fed by the document feeding unit A jam occurs in the document feeding means, a storage means for storing the first document image fed by the document feeding means and read by the reading means, and after the jam is released, When the original is fed by the original feeding means and the original is read by the reading means, the original image stored in the storage means and after the jam is released, the original is fed by the original feeding means and the reading means An image reading apparatus comprising: warning means for determining whether or not the same original is compared by comparing with the first original image read by the step, and issuing a warning when the original is not the same.

According to the present invention , a jam occurs in the image forming unit and the document feeding unit, and after the jam is released, the document is fed by the document feeding unit, and the document is read before the jam occurs when the document is read by the reading unit. Comparing the first original image fed by the feeding means and stored in the storage means with the first original image fed by the original feeding means and read by the reading means after the jam is released. It is possible to determine whether the document is the same document, and to issue a warning when the document is not the same document, so that it is possible to reduce the document setting error of the operator after jamming and to prevent unnecessary document reading operation or image forming operation. It becomes.

Embodiments of an image forming apparatus and an image reading apparatus to which the present invention is applied will be described below with reference to the drawings.

In the following description, as an embodiment of the present invention, an automatic document feeder that supplies a document to an image reading device in a copying machine as an image forming apparatus is taken up. As an order of explanation, first, a schematic configuration of the entire copying machine including the automatic document feeder will be briefly described, and then the automatic document feeder will be described in detail.

[Schematic configuration of copier]
A schematic configuration of a copying machine as an image forming apparatus will be briefly described with reference to FIG.

  As shown in FIG. 1, an automatic document feeder (ADF) 1 that is a sheet feeder (sheet conveying device) to which the present invention is applied is installed on the upper portion of a copying machine main body 50 so as to be openable and closable. In this automatic document feeder 1, a bundle of documents stacked on a stacking tray 2 disposed above is sequentially separated and fed one by one from the uppermost sheet, and a flow reading platen serving as a reading position of the copying machine main body 50. The image of the original is read while being transferred to the glass (platen). When the reading of the image is completed, the image is stacked on the discharge tray 3. The details of the automatic document feeder 1 will be described later.

  The copying machine main body 50 includes a reader unit 60 serving as a document reading unit and a printer unit 70 serving as an output unit (recording unit) that forms and outputs an image on a sheet.

  The reader unit 60 optically reads image information recorded on a document, photoelectrically converts it, and inputs it as image data. The scanner unit 63 includes a flow reading platen 51, a book platen 52, a lamp 61, and a mirror 62. , Mirrors 64 and 65, a lens 66, an image sensor 67, and the like. When reading an original using the automatic document feeder 1, the scanner unit 63 is stopped at the reading position 53, an image of the document moving on the flow reading platen 51 is read, and the automatic document feeder 1 is not used. In this case, the image of the document placed on the platen 52 is read by moving the scanner unit 63. The read image data is image-formed by the printer unit 70 when an image is formed. It is also possible to transmit image data as electronic data to a personal computer (PC) connected via a network (not shown).

The printer unit 70 is an image forming unit that uses well-known electrostatic latent image image formation. In the printer unit 70, reference numeral 71 denotes an upper cassette, and a sheet serving as a recording medium in the cassette is fed with a separation claw. The sheets are separated and fed one by one by the action of the feeding roller 72 and guided to the registration roller 77. Reference numeral 73 denotes a lower cassette. The sheets in the cassette are separated and fed one by one by the action of the separation claw and the feeding roller 74 and guided to the registration roller 77. 75 is a manual feed guide, and the sheet is guided to the registration roller 77 through the roller 76 one by one. A sheet deck 78 includes a middle plate 78a that is moved up and down by a motor or the like. The sheets on the middle plate 78a are separated and fed one by one by the action of the feeding roller 79 and the separation claw, and are guided to the conveying roller 80. The conveyance roller 80 guides the registration roller 77.

  Also, 81 is a photosensitive drum, 82 is a primary charger that uniformly charges the drum surface, 83 is an optical unit that forms an electrostatic latent image by irradiating the drum surface with image light (image information), and 84 is a drum. A developing unit for forming a toner image corresponding to image information on the surface, 85 a transfer charger for transferring the toner image on the drum surface to the sheet, 86 for a separation charger, and 87 for removing toner remaining on the drum surface after transfer These are cleaning devices, and these constitute an image forming unit.

In addition, 88 the conveyor belt for conveying the sheet on which an image is formed, 89 is a fixing device for fixing the toner image transferred to the sheet, 90 is conveying roller, 91 is a diverter. The image-formed sheet is guided to the discharge roller 92 by the diverter 91 and conveyed into the sorter 93. The sorter 93 includes a non-sort tray 94, a sort bin tray 95b, a non-sort tray discharge roller 96, and a sort bin tray discharge roller 97. The non-sort tray 94 and the sort bin tray 95 are moved up and down to sort the sheets one by one. . Note that a discharge tray may be mounted instead of the sorter 93.

  In the case of double-sided copying or multiple copying, the sheet after fixing is branched by a diverter 91 and conveyed by a conveying roller 101. In the case of double-sided copying, the intermediate sheet passes through belts 102, 104, a pass 106, and a discharge roller 105. It is discharged to the tray 100. 109 and 110 are half-moon rollers for feeding the sheet, 111 is a separation roller pair, and 113, 114, and 115 are transport rollers for transporting the sheet to the registration roller 77.

  Next, a typical automatic document feeder will be described in detail.

[Schematic configuration of automatic document feeder]
FIG. 2 is a cross-sectional view showing a schematic configuration of the automatic document feeder 1, and FIG. 3 is an enlarged cross-sectional view of a main part thereof.

  The automatic document feeder 1 according to this embodiment includes a single-sided reading mode for reading a document having image information on one side while reading the image information, and a double-side for reading the image information while conveying a document having image information on both sides. A reading mode. Hereinafter, each reading mode will be briefly described along the flow of the conveyed document.

  First, together with a brief description of the schematic configuration of the automatic document feeder 1, the flow of a single-sided document in the single-sided reading mode will be briefly described.

  As shown in FIGS. 2 and 3, the automatic document feeder 1 has a stacking tray 2 as a stacking unit, and stacks documents on the surface of the stacking tray 2.

  In the document feeder of the automatic document feeder 1, a feeding roller 4 serving as a feeding unit pulls a bundle of documents stacked on the stacking tray 2 into the separating units 5 and 6, and serves as a feeding unit constituting the separating unit. The uppermost sheet of the original bundle is separated one by one by the feeding roller 5 and the friction separation pad 6 as a separating means, and conveyed to the first registration rollers 7a and 7b. The first registration rollers 7a and 7b are stopped when the leading edge of the document arrives, and after the feed roller 5 forms a loop and corrects the skew feeding, the first registration rollers 7a and 7b are transported to a document transport section described later.

  In the document conveying section of the automatic document feeder 1, the document conveyed from the document feeding section described above is caused to flow between the reading platen 51 and the white plate 12 by the lead roller 8, the second registration roller 9, the lead roller 10, and the lead roller 11. Convey at a predetermined speed. At this time, a scanner unit 63 (see FIG. 1) as an exposure device is fixed below the reading position 53 on the flow reading platen 51, and an exposure operation (reading operation) is performed.

  In the document discharge section of the automatic document feeder 1, the discharge rollers 13a and 13b are separated while the exposure operation is being performed at the reading position 53, but the trailing edge of the document passes through the reading position 53 and can be read. After the completion, the discharge roller 13b moves upward (from the broken line position to the solid line position), the original is nipped by the discharge roller 13a and the discharge roller 13b, and the back surface is discharged onto the paper discharge tray 3.

  In FIGS. 2 and 3, S1 is a separation detection sensor that detects the separated and fed document by detecting the leading edge and the trailing edge of the document, S2 is a registration sensor that detects the leading edge of the document, and S3 is the leading edge of the document. S4 is a discharge sensor that detects the leading edge and the trailing edge of the document.

  Next, the flow of a double-sided document in the double-sided reading mode will be briefly described.

  The documents stacked on the stacking tray 2 are separated one by one by the document feeding unit and conveyed to the document conveying unit. In the document conveyance unit, the flow-reading platen 51 and the white plate 12 are conveyed at a predetermined speed in the same manner as on one side. At this time, a scanner unit 63 that is an exposure device is fixed below the reading position 53, and an exposure operation (reading operation) of the surface that is the first surface is performed.

  Then, after the trailing edge of the original passes through the paper discharge sensor S4, the discharge rollers 13a and 13b reversely rotate, and the original is transferred to the second registration roller 9 of the original conveying section located in the direction opposite to the original discharge direction. Switch back and transport. The second registration roller 9 is stopped when the leading edge of the document arrives, forms a loop by driving the discharge rollers 13a and 13b, performs skew correction on both sides, and transports it to the document transport section.

  The document transport unit performs an exposure operation (reading operation) on the back surface as the second surface in the same manner as the front surface as the first surface, and then transports the document to the document discharge portion.

  In the document discharge unit, the document supply device 1 of the present embodiment has a configuration in which the document is in a face-up state after reading the second surface (the first surface is facing upward). Since the order of the discharged documents is out of order, that is, the originals stacked in the page order on the stacking tray 2 are out of order on the discharge tray 3, it is necessary to perform re-inversion. For this reason, in the document discharge section, after the trailing edge of the document passes through the sheet discharge sensor S4, the discharge rollers 13a and 13b are reversed to transport the document again toward the document transport section. At this time, since the document conveying section only performs the reverse operation of the document surface in order to discharge the back surface, the second registration roller 9 does not perform the skew correction.

  The document that has passed through the document transport unit is transported again to the document discharge unit, nipped by the discharge rollers 13 a and 13 b, and discharged on the back side of the discharge tray 3. As a result, the document is discharged in a face-down state in which the first surface is facing down the apparatus.

[Hardware structure of copier]
FIG. 4 is a block diagram showing the configuration of the control system of the entire copying machine. A control unit that controls the entire copying machine is configured around a CPU circuit unit 400. The CPU circuit unit 400 is provided with a CPU 401, a ROM 402, a RAM 403, and the like.

  The CPU circuit unit 400 stores a program in the ROM 402, and an image reader that controls the document feeder control unit 408 that controls the document feeder 1 and the reader unit 60 according to the program executed by the CPU 401 and the setting of the operation unit 404. It controls the control unit 201, the image signal control unit 405, the printer control unit 301 that controls the printer unit 70, the finisher control unit 601 that controls the sorter 93, and the external interface (I / F) 406.

  The RAM 403 is used as an area for temporarily storing control data and a work area for computations associated with control. The external I / F 406 is an interface with the external computer 407 and develops print data from the external computer 407 into an image and outputs the image to the image signal control unit 405.

  The image reader control unit 201 outputs the image read by the image sensor 208 to the image signal control unit 405, and the image data output from the image signal control unit 405 to the printer control unit 301 is input to the exposure control unit 305. .

  FIG. 5 is a block diagram illustrating a configuration of the image signal control unit 405. The image signal control unit 405 includes an image processing unit 410, a line memory 411, a page memory 412, and a hard disk 413, and is controlled by the CPU 414. The image processing unit 410 performs image correction processing and editing processing according to the settings in the operation unit 102. The line memory 411 performs a mirror image process for exchanging images in the main scanning direction. The image data in the line memory 411 is output to the printer control unit 301 via the page memory 412. Image data is also stored in the hard disk 413 as necessary. The image data stored in the hard disk 413 can be transmitted as electronic data to a PC or the like via the external I / F 407 (SEND mode). Further, the image signal control unit 405 can read out image data stored in the hard disk 413 and compare it with the image signal control unit 405.

[Hardware configuration of automatic document feeder]
FIG. 6 is a block diagram showing the configuration of the document feeder controller 408 of the automatic document feeder 1. The CPU circuit unit 1000 includes a CPU 1001 that controls the entire automatic document feeder 1. A program is stored in the ROM 1002, and a RAM 1003 is used as an area for temporarily holding control data and a work area for operations associated with control. It is done. The external I / F 1004 is an interface that communicates with the image reader control unit 201 of the reader unit 60. Then, a separation motor M1 that separates documents placed on a stacking tray used in the automatic document feeder 1, a read motor M2 that conveys the separated documents and conveys them to a reading position, and a document that has been read is a discharge tray. The CPU circuit unit 1000 performs control according to signals from the paper discharge motor M3 that discharges the paper 3, the separation detection sensor S1, the registration sensor S2, the lead sensor S3, and the paper discharge sensor S4.

[Document reading operation of automatic document feeder]
FIG. 7 is a flowchart showing the document reading operation of the automatic document feeder 1. The CPU 401, 414, and 1001 execute control processing of this flowchart and flowcharts shown in FIGS.

When a document is set on the stacking tray 2 of the automatic document feeder 1, a document setting sensor (not shown) that recognizes that the document has been set is turned on (S101), and the reading operation starts when the start key is pressed. Is done. First, the CPU 1001 (see FIG. 6) obtains a reading mode arbitrarily set by the operator, for example, a single-sided copy mode, a double-sided copy mode, a SEND mode, etc., and simultaneously sets the number N of originals to 1. Then, separating the first sheet of the original bundle on the stacking tray 2 (S103), the document is Ru is conveyed to the reading platen 51 flow, it starts reading the first sheet (S104). When the trailing edge of the original passes through the flow reading platen 51, the reading of the first sheet is finished (S105).

Next, the CPU 1001 determines whether the number of documents N = 1 or the SEND mode (S106). In the case of the number N of originals or the SEND mode, the CPU 414 of the image signal control unit 405 is notified that the number of originals N = 1 or the SEND mode, and the CPU 414 in the image signal control unit 405 stores the image data in the page memory. It is stored in the hard disk 413 via 412 (S107). In the SEND mode, all originals to be read are stored in the hard disk 413 regardless of the number of originals for transmission to a PC or the like via an external I / F. On the other hand, when the number N of documents is not 1 in the copy mode (S106), the CPU 414 of the image signal control unit 405 stores the image data only in the page memory 412 (S110), and transmits the image data to the printer control unit 301.

  Next, the CPU 1001 confirms whether the document set sensor is ON (S108). When the original set sensor is ON, it is determined that the second and subsequent originals are still on the stacking tray 2, and 1 is added to the original number N (S109), and the second separation is started (S103). ) Repeat the above operation. If the document set sensor is OFF, the CPU 1001 determines that the read document is the last sheet, waits for the completion of paper discharge (S111), and ends.

[JAM detection operation of image forming apparatus]
The JAM detection operation for a sheet copied by the image forming apparatus will be described in detail with reference to the flowchart of FIG.

  When the operator selects the copy mode and starts the job by pressing the start key (S201), the CPU (not shown) of the printer control unit performs JAM detection of the sheet to be copied in real time. Then, a plurality of sensors arranged on the sheet conveyance path in the image forming apparatus are monitored in real time to detect a jam (S202). If no jam occurs until the job is completed (S203), the process ends as it is (S203). S204). If a jam occurs during sheet conveyance (S202), the CPU (not shown) of the printer control unit stops the image forming apparatus (S205).

  Further, the CPU 1001 of the automatic document feeder 1 receives from the printer control unit 301 that a jam has occurred in the image forming apparatus, discharges the document currently conveyed in the automatic document feeder, and stops. (S205). Next, the CPU 1001 acquires the number of originals M for which copying has been completed before a jam occurs, and stores it in the RAM 1003 (S206). Thereafter, the CPU circuit section 400 (see FIG. 4) displays that a jam has occurred on a display section (not shown) of the image forming apparatus (S207), and interrupts the image forming and image reading processing (S208).

[JAM detection operation of automatic document feeder]
The JAM detection operation for a document whose image is read by the automatic document feeder 1 will be described in detail with reference to the flowchart of FIG.

  When an operator sets a document on the stacking tray 2 and a copy mode or SEND mode is selected and a job is started by pressing a start key (S301), the CPU 1001 of the automatic document feeder 1 detects a jam of the document. In real time. A plurality of sensors S1, S2, S3, and S4 arranged on the sheet conveyance path in the image forming apparatus are monitored in real time to detect a jam (S302), and when the jam does not occur until the job is completed ( S303), and the process ends as it is (S304). If a jam occurs during document conveyance (S302), the CPU 1001 stops conveyance of the automatic document feeder 1 (S305).

  If the copy mode is selected by the operator, a CPU (not shown) of the printer control unit receives from the CPU 1001 that a jam has occurred in the automatic document feeder, and the sheet currently in the image forming apparatus. Is copied and discharged, and is stopped (S305). Next, the CPU 1001 acquires the number M of originals read before the jam occurrence and stores it in the RAM 1003 (S306). Thereafter, the CPU circuit section 400 (see FIG. 4) displays that a jam has occurred on a display section (not shown) of the image forming apparatus (S307), and interrupts the image forming and image reading processing (S308).

  Next, details of the processing according to the present invention will be described in detail with reference to FIGS.

[Re-read setting process after JAM processing]
Automatic document feeding after a jam occurs in the image forming apparatus or the automatic document feeder when the automatic document feeder 1 is in the copy mode or SEND mode, and the jam is released by the operator The rereading operation of the apparatus 1 will be described in detail with reference to the flowcharts of FIGS.

When the jam processing in the image forming apparatus or the automatic document feeder is canceled, the automatic document feeder again starts from the first sheet of the document bundle on the screen of the display unit (not shown) of the image forming apparatus as shown in FIG. A message is displayed to the operator so as to set to one stacking tray 2. When the operator sets the original again, the original set sensor is turned on (S401), and the OK key in FIG. 13A is pressed (S402), the CPU 1001 of the automatic original feeder separates the first sheet. Is restarted (S403). Next, the document is conveyed to the flow reading platen 51 and reading of the first sheet is started (S404). When the reading of the first original is completed, the CPU 414 in the image signal control unit 405 stores it in the page memory 412 (S405). The CPU 414 compares the first image data stored in the hard disk 413 before the occurrence of the jam with the image data reset after the occurrence of the JAM and stored in the page memory 412 (S406). If the CPU 414 determines that the document is the same (S407), it transmits that the document is the same to the CPU 1001 of the automatic document feeder 1.

  The CPU 1001 of the automatic document feeder compares the current number of originals N with the read number M stored in the RAM 1003 before the jam occurs, and discharges the paper without reading if the copy or read has already been completed. To control. If the number of read sheets M is larger than the current number of originals N (S407), the CPU 1001 determines that the original has been read, separates the originals, and discharges them without reading them (S408). Addition is performed (S409), and the above operation is repeated. When the number of read sheets M becomes smaller than the number of original sheets N, the CPU 1001 determines that the original has not been read or copied, and starts separation of the Nth sheet (S410). Then, the document is conveyed to the flow reading platen 51 and reading of the Nth sheet is started (S411).

When the SEND mode is selected (S413), the page memory 412 is stored in the hard disk 413. When the copy mode is selected (S413), the page memory 412 is stored. The CPU 1001 checks whether or not the document set sensor is ON (S415). If the document set sensor is ON, the CPU 1001 further determines that the document is still on the stacking tray 2, and adds 1 to the number N of documents. (S416), separation of the Nth sheet is started (S103), and the above operation is repeated. If the document set sensor is OFF, the CPU 1001 determines that the read document is the last sheet, waits for the completion of paper discharge (S417), and ends (S418).

  The CPU 414 of the image signal control unit 405 compares the first document (S406), and if it is determined that the documents are not the same document, it is determined that the resetting of the document after jam processing is incorrect. The first document is ejected (S419) and stopped. After the operation is stopped, the display unit (not shown) displays that the setting of the original is wrong as shown in FIG. 13B (S420), prompts the operator to set again, and re-read setting processing (S500).

  If the cancel key is pressed in FIG. 13A (S421), the process proceeds to a cancel process (S600).

[Re-read setting processing after JAM processing]
As shown in FIG. 13B, the re-read setting process when the original setting is wrong will be described in detail with reference to the flowchart of FIG.

When the operator sets a document again, the document set sensor is turned on (S501), and the OK key in FIG. 13B is pressed (S502), the CPU 1001 of the automatic document feeder 1 sets the first sheet. The separation is restarted (S503). Next, the original is conveyed to the flow reading platen 51 and reading of the first sheet is started (S504). When the reading of the first original is completed, the CPU 414 in the image signal control unit 405 stores it in the page memory 412 (S505). In addition, the CPU 414 compares the first image data stored in the hard disk 413 before the occurrence of the jam with the image data reset and stored in the page memory 412 (S506). If it is determined that they are the same document, the process proceeds to S407.

  The CPU 414 in the image signal control unit 405 compares the first document (S506). If it is determined that the documents are not the same document, it is determined that the resetting of the document is wrong again, and the first document is detected. Are discharged (S507) and stopped. Then, again as shown in FIG. 13B, it is displayed that the setting of the document is wrong (S508), and the above operation is repeated.

  When the cancel key is pressed in FIG. 13B (S509), the process proceeds to a cancel process (S600).

[Cancellation after JAM processing]
The flow of the cancellation process will be described in detail with reference to the flowchart of FIG. 12 and FIG.

  When the cancel key is pressed in FIGS. 13A and 13B, and when the document resetting twice is wrong, a display for interrupting the job is displayed as shown in FIG. (S601) and JOB is terminated (S602).

[Other embodiments]
In the above-described embodiment, when a jam occurs during image reading and the original is read again, the first image information of the original before the jam occurrence stored in the hard disk 413 and the first image read again after the jam occurrence are detected. The image information of the original document is compared and a warning is issued if the compared image information is not the same, but it may be a comparison of a predetermined number of images instead of a comparison of the first image information .

For example, when a jam occurs in the image forming apparatus or the automatic document feeder, an image read immediately before the jam occurrence and information indicating the number of the image are stored in the hard disk 413 . When the jam processing in the image forming apparatus or the automatic document feeder is canceled, the automatic document feeder again starts from the first sheet of the document bundle on the screen of the display unit (not shown) of the image forming apparatus as shown in FIG. A message is displayed to the operator so as to set to one stacking tray 2. When the operator sets a document again, the document set sensor is turned on, and the OK key in FIG. 13A is pressed, the CPU 1001 of the automatic document feeder restarts the separation of the first sheet. Next, the original is sequentially conveyed to the reading and reading platen 51, the original is read when the page when the jam occurs is fed to the reading and reading platen 51, and the image of the read original and the hard disk when the jam occurs. The images stored in 413 are compared. When the result of this comparison is inconsistent, a warning is issued as in the above-described embodiment.

  As described above, the same effects as those of the above-described embodiment can be obtained.

Sectional drawing which shows schematic structure of copying machine provided with automatic document feeder Sectional drawing which shows schematic structure of an automatic document feeder. Expanded sectional view of the main part of the automatic document feeder Block diagram showing the configuration of the entire copier control system Block diagram showing the configuration of the image signal controller Block diagram showing the configuration of the document feeder controller Flow chart showing the reading operation of the automatic document feeder Flowchart showing JAM detection operation of image forming apparatus Flowchart showing JAM detection operation of automatic document feeder Flowchart showing reread setting processing after JAM processing Flowchart showing re-read setting processing after JAM processing A chart showing the cancellation process after JAM processing Explanatory drawing which shows an example of each display screen after JAM processing

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Automatic document feeder 2 Loading tray 50 Copier main body 60 Reader part 70 Printer part 81 Photosensitive drum 83 Optical unit 84 Developer 400 CPU circuit part 401 CPU
402 ROM
403 RAM
1001 CPU

Claims (2)

A loading means for loading a bundle of documents;
Document feeding means for feeding documents one by one from a bundle of documents stacked on the stacking means;
Reading means for reading a document fed by the document feeding means;
Fed by said original feeding means, storage means for storing a first original image is read by the reading means,
Image forming means that the original image read form image type on the sheet by the reading means,
Said image forming means or a jam occurs in the document feeding means after release of the jam, performs feeding of the document by the document feeding means, when taking reading the original by said reading means, stored in said storage means determining whether the same document by comparing the first original image is read by the fed said reading means by said original feeding unit wherein an original picture image after release of the jam is the same An image forming apparatus comprising warning means for issuing a warning when an original is not a document . A loading means for loading a bundle of documents;
Document feeding means for feeding documents one by one from a bundle of documents stacked on the stacking means ;
Reading means for reading a document fed by the document feeding means;
Storage means for storing a first original image fed by the original feeding means and read by the reading means;
When a jam occurs in the document feeding unit and the jam is released, the document feeding unit feeds the document, and when the document is read by the reading unit, the document image stored in the storage unit After releasing the jam, it is determined whether the original document is the same by comparing it with the first original image fed by the original feeding unit and read by the reading unit. An image reading apparatus comprising a warning means for emitting.

Images