JPH07199564A - Image forming device - Google Patents

Abstract

PURPOSE:To complete the formation of image by a set number of pieces without interrupting the formation of the image after this by starting an ejection processing means and a switching means in accordance with the result of the decision of an error deciding means and continuing the formation of the image with an image forming means up to the completion of the set number of pieces. CONSTITUTION:A control part (controller) 300 is composed of a CPU 300a, a ROM 300b, a RAM 30Oc, etc. The error deciding means (controller 300) decides an error occurrence state in the detection of an original before the final one based on the output of means for detecting the final original and the original before it. The control means (controller 300) starts the ejection processing means and the switching-over means (a changeover to a second paper feeding mode based on the detection of the number of the originals) in accordance with the result of the decision and executes control to continue the formation of the image up to the completion of the set number. Therefore, even if the detection of the final original of i bundle of originals has an error, a recording medium fed in advance is ejected outside a machine and the formation of the image of the succeeding number is continued up to the completion of the set number of pieces based on the number of the originals detected up to this time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus in which an original conveying means can be connected to an image forming means or the original conveying means and the image forming means are integrated.

[0002]

2. Description of the Related Art Conventionally, in this type of image forming apparatus, a set of sheet originals is set on an original table and a required number of copies are automatically output. There is proposed a document circulation type document conveying device capable of separating and feeding the document to the document table, and re-mounting the fed document on the document table via a predetermined discharge path. The document conveying apparatus is connected to the image forming apparatus so that the function of the image forming apparatus can be systemized.

[0003]

In the image forming apparatus having the above-described structure, when the original conveying apparatus circulates the original to form images on a plurality of copies, when the final pre-original detection cannot be detected correctly, Since the image forming sequence is controlled so as to be ended, there is a problem that it is not possible to form an image for a desired number of copies set by the user from the operation unit.

If the detection of the original document before the final detection cannot be correctly made, the original document for image formation is to be fed to the recording medium that is fed in advance, so that the original document placing table and the original document ejecting table perform different original document conveyance. In a connectable image forming device, there is no document to be fed, so a jam occurs when it is not known that an error has occurred in the document detection before the final document, and the handling method is unclear, or the circulating type However, the document feeder has a problem in that the image forming operation is repeated indefinitely until the recording medium is no longer compatible with the document and there is no more paper.

The present invention has been made to solve the above problems, and detects the final document from the state of the final document detection and the final document detection of the document stack placed on the document table of the document feeder. By reliably detecting the error and controlling the subsequent document transport process and the process of the previously fed recording medium, even if the final document detection results in an error, it continues.
Another object of the present invention is to provide an image forming apparatus capable of efficiently forming images for the number of copies set on the basis of a restart request input after being temporarily interrupted.

[0006]

A first image forming apparatus according to the present invention includes a final document detecting unit for detecting a final document in a document stack conveyed from the document table, and an output of the final document detecting unit. An original number detecting means for detecting the number of originals based on the above, and an original placed on the image reading section as a first original, and an original placed on an original table conveyed subsequently to the first original. Is the second original, the recording medium fed corresponding to the second original is the first recording medium, and the recording medium subsequent to the first recording medium is the second recording medium. Before the start of the feeding of the second recording medium, the final front original detecting means for detecting whether or not the second original is the final paper, and the feeding of the second recording medium based on the output of the final front original detecting means. The first paper feed mode for paper control is set in accordance with the signal from the document number detecting means. The final pre-original document detection error occurrence state is determined based on the switching means for switching to the second paper feeding mode for controlling the feeding of the recording medium, and the output of the final original document detecting means and the output of the final pre original document detecting means. Error determination means, discharge processing means for discharging and transporting the recording medium that is fed to a predetermined position to the outside of the machine, and starting the discharge processing means and the switching means according to the determination result of the error determination means. A control means for controlling the image formation by the image forming means to be continued until the set number of copies is completed.

A second image forming apparatus according to the present invention detects a final document in a document bundle conveyed from the document table, and a final document detecting unit, and based on the output of the final document detecting unit, determines the number of documents. The original number detecting means for detecting the number of originals and the original placed on the image reading unit are used as a first original.
The second document is a document placed on a document table that is conveyed subsequently to the first document, and the recording medium fed corresponding to the second document is the first recording medium. When the recording medium subsequent to is the second recording medium, before the final document detecting unit for detecting whether the second document is the final sheet before the feeding of the second recording medium is started, and A first paper feed mode in which the paper feed control of the second recording medium is performed based on the output of the previous document detection means, and a second paper feed in which the paper feed control of the recording medium is performed according to the signal of the document number detection means. Switching means for switching the mode, error determination means for determining the final front original detection error occurrence state based on the output of the final original detection means and the output of the final front original detection means, and the feed to a predetermined position in advance. Ejection processing means for ejecting and conveying the recording medium to be printed out of the machine, and After starting the discharge process means and said switching means in accordance with the determination result of the error determination means,
And a control unit for interrupting image formation by the image forming unit, determining an input of an image formation restart request to the image forming unit, and restarting the interrupted image formation.

A third image forming apparatus according to the present invention includes a final document detecting means for detecting a final document in a document stack conveyed from the document table, and a first document placed on the image reading section. , A document placed on a document table conveyed subsequently to the first document is a second document, and a recording medium fed corresponding to the second document is a first recording medium. age,
When the recording medium subsequent to the first recording medium is used as the second recording medium, before the final document detection, it is detected whether the second document is the final sheet before the feeding of the second recording medium is started. And a first paper feed mode for carrying out paper feed control of the second recording medium based on the output of the last document detecting means and the paper feed control of the recording medium according to the signal of the last document detecting means. A switching means for switching between the second paper feed mode and an error determining means for determining a final front original detection error occurrence state based on an output of the final original detection means and an output of the final front original detection means. The discharge processing means that discharges and conveys the recording medium fed to a predetermined position to the outside of the machine, and the discharge processing means and the switching means are activated according to the determination result of the error determination means, and the image formed by the image forming means is activated. Set the number of copies finished In is provided with a control means for controlling to continue.

A fourth image forming apparatus according to the present invention includes a final document detecting means for detecting a final document in a document bundle conveyed from the document table, and a first document placed on the image reading section. , A document placed on a document table conveyed subsequently to the first document is a second document, and a recording medium fed corresponding to the second document is a first recording medium. age,
When the recording medium subsequent to the first recording medium is used as the second recording medium, before the final document detection, it is detected whether the second document is the final sheet before the feeding of the second recording medium is started. And a first paper feed mode for carrying out paper feed control of the second recording medium based on the output of the last document detecting means and the paper feed control of the recording medium according to the signal of the last document detecting means. A switching means for switching between the second paper feed mode and an error determining means for determining a final front original detection error occurrence state based on an output of the final original detection means and an output of the final front original detection means. Discharge processing means that discharges and conveys the recording medium fed to a predetermined position to the outside of the machine, and after starting the discharge processing means and the switching means according to the determination result of the error determination means, Interrupt image formation, It is provided with a control means to resume the image formation was interrupted to determine the input of the image forming resumption request for serial image forming means.

A fifth image forming apparatus according to the present invention includes a final document detecting means for detecting a final document in a document stack conveyed from the document table, and a first document placed on the image reading section. , A document placed on a document table conveyed subsequently to the first document is a second document, and a recording medium fed corresponding to the second document is a first recording medium. age,
When the recording medium subsequent to the first recording medium is used as the second recording medium, before the final document detection, it is detected whether the second document is the final sheet before the feeding of the second recording medium is started. Means, an error determination means for determining a final front original detection error occurrence state based on an output of the final original detection means and an output of the final front original detection means, and a recording medium fed to a predetermined position in advance. And a control means for activating the discharge processing means according to the determination result of the error determination means and controlling the image formation by the image forming means to continue until the end of the set number of copies. And are provided.

A sixth image forming apparatus according to the present invention includes a final document detecting means for detecting a final document in a stack of documents conveyed from the document table, and a first document placed on the image reading section. , A document placed on a document table conveyed subsequently to the first document is a second document, and a recording medium fed corresponding to the second document is a first recording medium. age,
When the recording medium subsequent to the first recording medium is used as the second recording medium, before the final document detection, it is detected whether the second document is the final sheet before the feeding of the second recording medium is started. Means, an error determination means for determining a final front original detection error occurrence state based on an output of the final original detection means and an output of the final front original detection means, and a recording medium fed to a predetermined position in advance. Discharge processing means for discharging and transporting the sheet to the outside of the machine, and after starting the discharge processing means according to the determination result of the error determination means, the image formation by the image forming means is interrupted and the image formation for the image forming means is restarted. A control means for determining the input of the request and restarting the interrupted image formation is provided.

In a seventh image forming apparatus according to the present invention, a final document detecting means for detecting a final document in a document bundle conveyed from the document table, and a document placed on the image reading unit are firstly arranged. , A document placed on a document table conveyed subsequently to the first document is a second document, and a recording medium fed corresponding to the second document is a first recording medium. age,
When the recording medium subsequent to the first recording medium is used as the second recording medium, before the final document detection, it is detected whether the second document is the final sheet before the feeding of the second recording medium is started. Means, and based on the output of the final original document detecting means and the output of the final previous original document detecting means during image formation in the mode of feeding the second recording medium in response to the output of the final front original detecting means. An error determination means for determining a state of occurrence of a pre-final original document detection error, and activation of the image forming means is controlled based on the determination result of the error determination means, and the recording medium previously fed is ejected to the outside of the machine to form an image. An error processing unit for ending the formation is provided.

In the eighth image forming apparatus according to the present invention, the error processing means is configured to discharge the precedingly fed recording medium as it is outside the apparatus while the image forming by the image forming means is stopped. Is.

In the ninth image forming apparatus according to the present invention, the error processing means suspends the document transportation by the document transportation means, forms an image on the recording medium previously fed, without a document, and discharges the image outside the apparatus. It is configured as follows.

In the tenth image forming apparatus according to the present invention, the error determination means determines that the final front original detection means does not detect the final front original when the final original detection means detects the final original. The configuration is such that it is determined as a document detection error.

[0016]

In the first aspect of the invention, the control means activates the discharge processing means and the switching means in accordance with the result of the determination by the error determining means, and controls the image forming by the image forming means so as to continue until the set number of copies is completed. Even if an error is detected in the detection of the final document in the document stack, the recording medium that was previously fed is ejected to the outside of the machine, and the image formation of the subsequent copies is interrupted based on the number of documents detected so far. It is possible to continue accurately until the image formation for the set number of copies is completed without performing.

In the second aspect of the invention, after the control means activates the discharge processing means and the switching means in accordance with the judgment result of the error judgment means, the image formation by the image formation means is interrupted and the image formation for the image formation means is restarted. Since the input of the request is judged and the interrupted image formation is restarted, the recording medium fed in advance is ejected to the outside of the machine, the image formation is once interrupted based on the final document detection error, and then the restart request is issued. For example, based on the number of documents detected so far, it is possible to accurately continue the image formation of the subsequent copies until the image formation for the set number of copies is completed without interruption.

In the third aspect of the invention, the control means activates the discharge processing means and the switching means in accordance with the judgment result of the error judgment means, and the image formation by the image forming means is continued until the set number of copies is completed. It is possible to discharge the formed recording medium to the outside of the machine and accurately continue the subsequent image formation of the number of copies based on the output of the final document detecting unit until the image formation of the set number of copies is completed without interruption. It will be possible.

In the fourth aspect of the invention, after the control means activates the discharge processing means and the switching means in accordance with the determination result of the error determination means, the image formation by the image forming means is interrupted and the image forming means is terminated. Since the interrupted image formation is restarted after determining the input of the image formation restart request to the printer, the recording medium fed in advance is ejected to the outside of the machine, and the image formation is temporarily stopped based on the final document detection error. When the restart request is issued, it is possible to accurately continue the image formation of the subsequent number of copies based on the output of the final document detecting means until the image formation of the set number of copies is completed without interruption.

In the fifth aspect of the invention, the control means activates the discharge processing means in accordance with the result of the determination by the error determining means, and the image formation by the image forming means is continued until the set number of copies is completed. Even if an error occurs, after that, the recording medium that has been fed in advance is ejected to the outside of the machine each time, and the image formation of the subsequent number of copies is accurately continued without interrupting the set number of copies. Is possible.

In the sixth invention, after the control means activates the discharge processing means in accordance with the judgment result of the error judging means, the image forming by the image forming means is interrupted and the image forming on the image forming means is restarted. Since the request input is judged and the interrupted image formation is restarted, the temporary image formation is interrupted while ejecting the previously fed recording medium to the outside of the machine every time, even if the last previous original detection becomes an error. If a restart request is issued thereafter, it is possible to accurately repeat the image formation of the subsequent number of copies until the image formation for the set number of copies is completed.

In the seventh aspect of the invention, the error processing means controls the activation of the image forming means based on the judgment result of the error judging means to discharge the precedingly fed recording medium to the outside of the machine to finish the image formation. Therefore, it is possible to discharge the remaining recording medium to the outside of the apparatus to reliably notify the occurrence of an error and prepare for normal image formation thereafter.

In the eighth aspect of the invention, the error processing means discharges the precedingly fed recording medium as it is while the image formation by the image forming means is stopped, so that the error processing means remains while the image forming means is stopped. It is possible to eject the recording medium to the outside of the apparatus to notify the occurrence of an error reliably and to prepare for normal image formation thereafter.

In the ninth image forming apparatus according to the present invention, the error processing means suspends the document transportation by the document transportation means, forms an image on the recording medium previously fed, without a document, and discharges the image outside the apparatus. Therefore, it is possible to discharge the remaining recording medium to the outside of the machine while driving the image forming unit normally to notify the occurrence of an error, and to prepare for normal image formation thereafter.

In the tenth aspect of the invention, the error determining means determines that the final original detection error has occurred when the final front original detection means has not detected the final front original at the time when the final original detection means detects the final original. Therefore, it is possible to reliably detect the pre-final document detection error.

[0026]

【Example】

[First Embodiment] FIG. 1 is a sectional view for explaining the structure of an image forming apparatus in an image forming apparatus showing a first embodiment of the present invention. The image forming apparatus according to the present embodiment is an electrophotographic image forming apparatus and is roughly divided into four blocks such as a sheet feeding / conveying system, an exposure system, an image forming system, and a control system. . The configuration will be described below for each system.

The exposure system is composed of a document table, a document illuminating section, an optical path section, etc. The document placed on the document table is scanned by the document illuminating lamp 4, and the light image of the document is read by a plurality of mirrors and a zoom lens 8.
It is projected onto the photosensitive drum 12 via.

The scanning of the document illumination lamp 4 is driven by an optical driving stepping motor (not shown), and the zoom lens 8 is moved.
Is driven by a lens driving stepping motor (not shown), and the output image is scaled by changing the scanning speed of the document illumination lamp 4 and moving the position of the lens motor.

The image forming system comprises a photosensitive drum 12, a primary charger 9, a developing device 16, a drum cleaner section 6 and the like. Photosensitive drum 1 rotating clockwise in the figure
On the drum 2, the surface charge of the drum uniformly charged by the primary charger 9 is removed by the blank exposure lamp 10 in the non-image area, and the image area is exposed by the projection light of the original from the exposure system. It Photosensitive drum 1 by image exposure
The electrostatic latent image formed on 2 is developed by the developing device 16 or the CD unit 13, and then transferred by the transfer charging device 24 onto the transfer paper conveyed from the paper supply unit.

The residual toner is removed from the photosensitive drum 12 after the transfer by the cleaning unit 6, and the residual charge is removed by the pre-exposure lamp 7, and the processes of primary charging, image exposure, development and transfer are repeated again. .

The sheet feeding / conveying system is composed of a sheet feeding section, a conveying section, a fixing section and the like.

In the paper feeding operation from the first-stage cassette 28, the transfer paper is fed from the cassette by the cassette 1 paper feeding roller 21, and the registration roller 22 by the vertical path roller 18.
Be transported to. In the sheet feeding operation from the second-stage cassette 29, the transfer sheet is fed from the cassette by the cassette 2 sheet feeding roller 20, and is conveyed to the registration roller 22 by the vertical path rollers 18 and 19. In the manual paper feeding operation, the manually fed transfer paper is conveyed by the manual paper feeding roller 17 to the registration roller 22. The transfer sheet conveyed to the registration roller 22 forms a loop against the registration roller 22, and the skew correction and the timing adjustment of the leading edge of the image are performed.

Further, in this embodiment, in order to align the lateral edge of the image on the photosensitive drum 12 with the edge of the transfer paper, a stepping motor (not shown) is used to form the registration roller 2
Control to move 2 in the lateral direction is also performed.

The toner image developed on the photosensitive drum 12 is transferred by the transfer charger 24 to the transfer sheet conveyed from the registration roller 22, and the transfer sheet is separated from the photosensitive drum 12 by the separation charger 25 and conveyed. Through section 27,
It is conveyed to the fixing roller 30.

The fixing roller 30 is heated by a fixing heater 311 (see FIG. 2), and the surface temperature of the fixing roller 311 is determined by the thermistor 302.
The transfer paper conveyed to the fixing roller 30 whose temperature is detected by the control roller 30 is controlled so that the surface temperature of the fixing roller 30 reaches a predetermined value, and the toner image transferred onto the transfer paper by the fixing roller 30 is heated and pressed. Is fixed by. After fixing, the fixing roller is cleaned by the web 5.

In the case of a normal copy, the transfer sheet on which the toner image is fixed is conveyed by the sheet discharge roller 31 and the sheet discharge roller 33 and discharged outside the machine.

In the case of multiple copy, the sheet deflection plate 32 is directed upward, and the transfer sheet after the first-side copy fixing is conveyed from the sheet discharge roller 31 to the lower conveyance section inlet roller 34, and the setback roller 26 and the lower conveyance. It is conveyed to the registration roller 22 through the partial exit roller 35. After that, the second side copy is carried out in the same manner as the normal copy, and the multiple-transferred transfer paper is ejected.

In the case of double-sided copying, the transfer paper after the first-side copy fixing is conveyed from the paper discharge roller 31 to the paper discharge roller 32, and after the rear end of the transfer paper passes through the paper deflecting plate 32, the paper discharge roller 32. The sheet discharge roller 32 driven by a stepping motor (not shown) reverses until the sheet passes through, and the sheet deflection plate 32 is directed to the upper side, and the switchback transfer sheet is conveyed to the lower conveyance section inlet roller 34. Then, it is conveyed to the registration roller 22 through the setback roller 26 and the lower conveying section outlet roller 35. After that, the second side copy is performed in the same manner as the normal copy, and the double-sided copy transfer paper is ejected.

FIG. 2 is a block diagram illustrating the control configuration of the image forming apparatus shown in FIG. In the figure, 300
Is a control unit (controller), the CPU 300a, the ROM
The ROM 30 includes a RAM 300b and a RAM 300c.
The image forming sequence is generally controlled based on the program stored in 0b.

The operation unit 312 includes a copy mode (single-sided / double-sided / multiplexed mode, image forming magnification, cassette selection, etc.) setting key, a ten key for setting the number of copies, a start key for instructing the start of image forming operation, and an image forming operation. A key input unit such as a stop key for instructing stop, a reset key for returning the operation mode to the standard state, and a display unit such as an LED / liquid crystal for displaying the setting state of the operation mode are arranged.

The thermistor 302 detects the surface temperature of the fixing roller 30, and the value A / D converted by the A / D converter 301 is input to the controller 300. The controller 300 controls the surface temperature of the fixing roller 30 to a predetermined value based on the detection value of the thermistor 302.

The high voltage controller 303 controls the high voltage unit 304 which applies a predetermined potential to the charging system such as the primary charger 9, the transfer charger 24 and the developing device 16.

The motor controller 305 controls the driving of the motor 306 such as various stepping motors and main drive motors.

The DC load controller 307 controls driving of solenoids for the cassette 1 paper feed roller 21, etc., clutches for the vertical path roller 18, fans, etc. Reference numeral 308 denotes a sensor for detecting a paper jam of the transfer paper, which is a control unit 300.
Entered in. The AC driver 309 controls the AC power supply to the AC load 310 such as the document illumination lamp 4 and the fixing heater 311. Further, the abnormality of the document illumination lamp 4, the fixing heater 311 and the like is detected, and the main switch 314 having a shut-off function is turned off.

The DC power supply 313 supplies the DC power to the controller 300 and the like, and the AC power input from the power plug 316 is the door switch 315 and the main switch 31.
4 to the DC power supply 313.

The paper deck 351 is a sheet feeding device for increasing the number of transfer sheets to be stacked, and is optionally connected.

The editor 352 is for inputting position information such as trimming / masking processing and is optionally connected. The feeder 353 is for automatically setting a plurality of documents, and is optionally connected.

The sorter 354 is for sorting the transfer sheets to be ejected, and is optionally connected.

FIG. 3 is a sectional view for explaining the structure of the (document feeder) feeder 353 shown in FIG.

In the figure, 501 is a document stacking tray and 5
Reference numeral 02 denotes a long-sized original sub-tray, and 503 denotes a half-moon roller. The half-moon roller 503 separates the leading edge of the original M and cooperates with the weight 504 to feed the sheet.

Reference numeral 505 is a front end stopper when the document M is set, and 506 is a sensor for detecting the document M. A separation regulation plate 507 regulates and guides the document M entering the separation portion 511. And the separation part 5
11 is a roller 509a, 509b, and these rollers 5
The separation belt 510 and the separation roller 508 are stretched around the sheets 09a and 509b, and separate the originals M one by one from the bottom. Reference numeral 512 denotes a separation sensor, which is designed to quickly detect a paper jam after separation. 5
A pre-registration sensor 13 detects the leading edge of the separated document M, abuts against the nip portion formed by the registration roller 514 and the transport roller 515, performs timing of loop formation, etc., and then further scans the document M. It is designed to be transported. The registration sensor 516 detects the leading edge of the document M and then controls the stop of the platen 517 by detecting the trailing edge of the document.

A document is conveyed on the platen 517 by a full-face belt 520 suspended by a driving roller 518 and a driven roller 519, and a pressing roller 521 from the back surface of the belt 520. 522 is a jump platform,
The discharged document M is guided from the platen 517 to the sheet conveying device, and the middle guide 523, the lower guide 524, and the reversing stay 5 are guided.
It is designed to be guided by 25 and others. Reference numeral 526 is a reversing sensor, and 527 is a reversing roller, which is pressed against the conveying roller 515. A flapper 528 switches paths. Reference numeral 529 denotes a paper ejection sensor, which is adapted to control the timing of paper ejection, and ejects the document M by the paper ejection roller pair 532. A circulation and final document detection lever 533 (recycle lever) is arranged on the back side of the tray 501, and is rotated by a recycle motor 534. Hereinafter, the recycle lever 533 shown in FIG. 3 will be described in detail with reference to FIG.

FIG. 4 shows the recycle lever 5 shown in FIG.
It is a principal part expanded sectional view explaining the structure of 33.

As shown in this figure, the recycle motor 53
A lever 533 is rotatably attached to the fourth shaft 534a, and a rotation pin 535 for rotationally driving the lever 533 is fixed to the shaft 534a. Further, the flag 536 is supported so as to rotate integrally with the lever 533. Further, an optical sensor 537 having an optical path a that faces the flag 536 and detects the position of the flag 536 is provided.

When a copy start key (not shown) is turned on, the recycle motor 534 is started, and the lever 533 is rotated by the rotating pin 535 to press the uppermost part of the bundle of documents M.

When the lever 533 falls to the position indicated by the broken line due to its own weight after the final document M of the bundle of documents M is separated, the sensor 537 displaces the end surface 536a of the flag 536 along with the movement of the lever 533. By detecting, the bundle of documents M has completed one cycle,
It is adapted to detect that it is the final original of the bundle of originals M.

The configuration of the control system of the document feeder (feeder) 353 shown in FIG. 4 will be described below with reference to FIG.

FIG. 5 is a block diagram of the control system of the document feeder (feeder) 353 shown in FIG.

As shown in the figure, the feeder control system in this embodiment is a well-known one-chip microcomputer (microcomputer) 54 having a ROM, RAM, CPU and the like built therein.
8 and a clock disk 5 attached to the shaft of the separation drive motor 547 at the input port I1.
A half-moon home position sensor 538 for detecting that the half-moon roller is at the home position in a state in which the half-moon roller does not project on the transport path by 39 is provided in I2 to I5 as the separation sensor 12, the reversal sensor 526, the paper discharge sensor 529, and the recycle sensor. Lever sensors 537 are respectively connected, and entrance document detection sensor 506 and pre-registration sensor 51 are connected to A / D channels A / D1 to A / D3, respectively.
3 and the registration sensor 516 are connected. Further, at the interrupt terminals INT1 and INT2 of the microcomputer, a signal from a belt clock sensor 540 that detects the rotation of the motor by a clock disc 542 attached to the belt motor shaft, and a clock disc 54 attached to the conveyor motor shaft.
The signal from the carrier clock sensor 539 for detecting the rotation of the motor is input by 3, and this serves as a reference clock for the movement amount of the paper feed, and the microcomputer internal counter performs the counting operation. Then, at the output ports O1 to O8, an electromagnetic brake 541 that stops and prohibits the drive of the recycle motor 524 that drives the recycle lever 533 and the belt motor that is attached to the belt motor shaft, and a stopper solenoid 543 that opens and closes the document conveyance path. A flapper solenoid 543 that drives a flapper 528 that performs a recoil operation or a paper discharge operation of a document is connected to a weight solenoid 544 that drives a weight 504, a belt motor 545, a conveyance motor 546, and a separation motor 547, respectively.

In this embodiment, the recycle lever sensor 537 functions as the final pre-original document detecting means or the final document detecting means at a timing depending on the position state of the lever 533 detected by the recycle lever sensor 537 and the document feeding state.

The number-of-documents detecting unit detects the number of documents fed until the final document detecting unit detects the final document, thereby detecting the number of documents.

The original table on which the stack of originals is placed in this way, the paper feed section for conveying the placed originals to the image reading section, and the paper ejection section for ejecting and conveying the originals conveyed to the image reading section. And a circulation type original document conveying means (an original document conveying device 353) for bundling the originals ejected from the paper ejecting section on an original table, and an image forming means for reading image information and forming an image on a recording medium (shown in FIG. 1). And a final document detecting unit for detecting a final document in a document stack conveyed from the document table, and an output of the final document detecting unit. An original number detecting unit for detecting the number of originals, an original placed on the image reading unit is used as a first original, and an original placed on an original table conveyed subsequently to the first original is placed as a second original. Document and is fed corresponding to the second document. The that recording medium is a first recording medium,
When the recording medium subsequent to the first recording medium is used as the second recording medium, before the final document detection, it is detected whether the second document is the final sheet before the feeding of the second recording medium is started. And a first paper feed mode in which the paper feed control of the second recording medium is performed based on the output of the means and the document detection means before the final document feed control of the recording medium in accordance with the signal of the document number detection means. An error for determining the state of occurrence of the last front original detection error based on the switching means (controller 300 or the microcomputer 548) for switching to the second paper feed mode, and the output of the final original detection means and the output of the last front original detection means. Determination means (controller 300 or microcomputer 548),
Ejection processing means (controller 300 or microcomputer 548) that ejects and conveys the recording medium fed to a predetermined position to the outside of the machine in advance, and control means (controller 300 or microcomputer 54 according to the determination result of the error determination means).
8) activates the discharge processing means and the switching means (switching to the second paper feed mode (based on the detection of the number of originals)) and controls the image formation by the image forming means to continue until the set number of copies is completed. Even if the detection of the final document in the document stack becomes an error, the recording medium previously fed is ejected to the outside of the machine, and the image formation of the subsequent copies is interrupted based on the number of documents detected so far. It is possible to continue accurately until the image formation for the set number of copies is completed.

Further, after the control means activates the discharge processing means and the switching means in accordance with the judgment result of the error judgment means, the image formation by the image forming means is interrupted and the input of the image formation restart request to the image forming means is judged. Then, the interrupted image formation is restarted, so that the previously fed recording medium is ejected to the outside of the machine, the image formation is interrupted once based on the final document detection error, and if a restart request is issued thereafter, it will be detected by that time. It is possible to accurately continue the image formation of the subsequent number of copies based on the determined number of originals until the image formation of the set number of copies is completed without interruption.

Further, a document table on which a stack of documents is placed, a paper feed unit for conveying the placed documents to the image reading unit, and a paper ejection unit for ejecting and conveying the documents conveyed to the image reading unit. A second image forming apparatus including: a circulation type document conveying unit that bundles the respective documents discharged from the sheet discharging unit on a document table; and an image forming unit that reads image information and forms an image on a recording medium. A final document detecting means for detecting a final document in a stack of documents conveyed from the document table, and a document placed on the image reading section as a first document, and a document conveyed subsequently to the first document. The original placed on the table is the second original, the recording medium fed corresponding to the second original is the first recording medium, and the recording medium following the first recording medium is the second recording. When the medium is used as the medium, the second original is not printed before the feeding of the second recording medium is started. Last front original detection means for detecting whether or not it is the last paper, first paper feed mode for performing paper feed control of the second recording medium based on the output of the last front original detection means, and the last original detection means Of the final original document based on the output of the final original document detection means and the output of the final original document detection means Equipped with an error determination means for determining an error occurrence state and a discharge processing means for discharging and transporting a recording medium previously fed to a predetermined position to the outside of the machine, and the control means discharges according to the determination result of the error determination means. Since the processing means and the switching means (switching to the second paper feed mode (mode based on the final document detection)) are started and the image formation by the image forming means is continued until the set number of copies is completed, the recording medium previously fed. The machine Is discharged, it is possible to continue accurate to complete setting of copies of the image forming without interrupting subsequent image formation of copies that follows on the basis of the output of the subsequent final document detecting means.

Further, after the control means activates the discharge processing means and the switching means in accordance with the judgment result of the error judging means, the image formation by the image forming means is interrupted,
Since the input of the image formation restart request to the image forming unit is judged and the interrupted image formation is restarted, the previously fed recording medium is ejected to the outside of the machine and the image formation is once performed based on the final document detection error. If it is interrupted and a restart request is issued thereafter, it is possible to accurately continue the image formation for the set number of copies based on the output of the final document detecting means without interrupting the subsequent image formation for the set number of copies.

Further, a document table on which a stack of documents is placed, a paper feed unit that conveys the placed documents to the image reading unit, and a paper ejection unit that ejects and conveys the documents conveyed to the image reading unit. In the third image forming apparatus, the third image forming apparatus further comprises: a circulation type document conveying unit that bundles each document discharged from the sheet discharging unit on a document table, and an image forming unit that reads image information and forms an image on a recording medium. A final document detecting means for detecting a final document in a stack of documents conveyed from the document table, and a document placed on the image reading section as a first document, and a document conveyed subsequently to the first document. The original placed on the table is the second original, the recording medium fed corresponding to the second original is the first recording medium, and the recording medium following the first recording medium is the second recording. When the medium is used as the medium, the second original is fed before the feeding of the second recording medium is started. A final front original detection unit for detecting whether or not it is the final sheet; and an error determination unit for determining a final front original detection error occurrence state based on the output of the final original detection unit and the output of the final front original detection unit. And a discharge processing unit that discharges and conveys a recording medium that is previously fed to a predetermined position to the outside of the machine, and the control unit activates the discharge processing unit according to the determination result of the error determination unit, and the image forming unit. Since the image formation by the above is continued until the set number of copies is completed, even if an error occurs in the detection of the last previous document, the image formation of the subsequent number of copies is interrupted thereafter while ejecting the recording medium that is fed in advance outside the machine every time. It is possible to continue accurately until the image formation for the set number of copies is completed.

In addition, after the control means activates the discharge processing means in accordance with the determination result of the error determination means, the image formation by the image forming means is interrupted and the input of the image formation restart request to the image forming means is determined. Since the interrupted image formation is restarted even if an error occurs in the document detection before the final
After that, temporary image formation is interrupted while ejecting the previously fed recording medium to the outside of the machine every time, and if a restart request is issued thereafter, the image formation of the subsequent number of copies is accurately performed until the image formation of the set number of copies is completed. The formation can be repeated.

Further, a document table on which a stack of documents is placed, a paper feed unit for conveying the placed documents to the image reading unit, and a paper ejection unit for ejecting and conveying the documents conveyed to the image reading unit. In the fourth image forming apparatus, the fourth image forming apparatus further comprises: a circulation type document conveying unit that bundles each document discharged from the sheet discharging unit on a document table, and an image forming unit that reads image information and forms an image on a recording medium. A final document detecting means for detecting a final document in a stack of documents conveyed from the document table, and a document placed on the image reading section as a first document, and a document conveyed subsequently to the first document. The original placed on the table is the second original, the recording medium fed corresponding to the second original is the first recording medium, and the recording medium following the first recording medium is the second recording. When the medium is used as the medium, the second original is fed before the feeding of the second recording medium is started. An output of the final original detection unit during image formation in a mode in which the final front original detection unit detects whether or not the sheet is the final sheet and a mode in which the second recording medium is fed according to the output of the final front original detection unit. And error determination means for determining the state of occurrence of the last front original detection error based on the output of the last front original detection means, and the error processing means controls activation of the image forming means based on the determination result of the error determination means. Then, the previously fed recording medium is ejected to the outside of the machine to complete the image formation, so that the remaining recording medium is ejected to the outside of the machine to reliably notify the occurrence of an error and prepare for the subsequent normal image formation. be able to.

Further, since the error processing means discharges the recording medium previously fed in the state where the image formation by the image forming means is stopped to the outside of the apparatus as it is, the recording medium remaining while the image forming means is stopped is removed from the apparatus. It can be discharged to the outside to reliably notify the occurrence of an error and to be ready for normal image formation thereafter.

Further, the error processing means suspends the document transportation by the document transportation means, forms an image on the previously fed recording medium in the absence of the document, and discharges it out of the apparatus. Therefore, the image forming means is driven as usual. However, the remaining recording medium is ejected to the outside of the machine to reliably notify the error occurrence, and
It is possible to prepare for normal image formation thereafter.

Further, the error judging means judges the final original detection error when the final original detecting means has not detected the final original at the time when the final original detecting means detects the final original. A pre-final document detection error can be detected.

It should be noted that the main body side shown in FIG. 1 may be provided with the above-mentioned error determination means, and the discharge processing means may be activated by this error determination means. Further, an error signal means is provided, and an error signal is transmitted to the main body side in response to the output of the error determination means, and when the main body receives the error signal, the paper discharge processing means is activated. Good.

Further, the paper discharge processing means may discharge the recording medium, which has been fed earlier, to the outside of the apparatus without performing the image forming processing by the image forming means. It is also possible to form a roller belt image by the image forming means and discharge it to the outside of the apparatus without feeding the document to the medium by the document conveying device. Further, at this time, with respect to the recording medium on which an image is formed without ejecting the original by the original conveying device and ejected outside the apparatus, control is performed so that counting for billing is not performed in consideration of user convenience. ing.

Further, the above-mentioned document number detecting means may be provided on the main body side or the document conveying device side, and the same effect can be expected.

Similarly, the mode switching means may be provided on the main body side, or the same effect can be expected if it is provided on the document conveying device side.

Further, in the present embodiment, the main body side may be configured to invalidate the output of the final front original detection means and execute the mode switching of the switching means, and the original conveying device side may operate the final and final front original detection means. It may be configured such that only the final document detecting means is activated without being activated, and mode switching is executed on the main body side.

Further, the error processing means displays a message to the effect that an error has occurred on the display section of the operation section 312 according to the output of the error detection means, as will be described later. At that time, the error processing means controls to suspend the error notification after the second circulation of the original document and discharge the precedingly fed recording medium to the outside of the apparatus every time.

The error processing means and / or the error detection means may be provided on the main body side, or may be provided on the original conveying device side and control is performed by communication processing between the main body and the original conveying device. You can expect an effect.

Various control operations of the document feeder will be described below with reference to the flow charts shown in FIGS. [Document Transport Processing] FIG. 6 shows the microcomputer 548 shown in FIG.
6 is a flowchart showing an example of a document transport processing procedure according to FIG. Note that (1) to (9) indicate each step.

First, the recycle motor 534 is driven (1), and the recycle lever 533 presses the uppermost surface of the document stack. Next, the lowermost original (first original) on the original stack tray 501 is separated by a separation processing routine described later (2), and the original separated in step (2) is placed on the platen 517 by a paper feeding processing routine described later. (3). Next, when the document is completely fed (4) and there is a document on the document stacking tray 501, the second document following the first document is separated during the exposure of the main body (5). At this time, in the separation process, the presence or absence of the third original document following the second original document is detected by the sensor 537 via the flag 536 depending on whether the lever 533 is on the original document. That is, it is the final pre-manuscript.

Next, it waits until the exposure end signal is received from the main body (6), and when it is received, the first original discharge processing is started and the second original feeding processing is started. (7) and returns to step (4).

On the other hand, if the judgment in step (4) is YES, when the paper discharge signal is received (8), the paper discharge processing routine is executed (9), and the processing is ended.

In this embodiment, the paper discharge process and the paper feed process are time-divisionally performed at the same time.

FIG. 7 is a flow chart showing an example of a detailed procedure of a separation processing routine by the microcomputer 548 shown in FIG. Note that (1) to (13) indicate each step. First, the separation motor 547 is started to drive (1), and the separation sensor 512 is on standby (2). When the separation sensor 512 is on, the pre-registration sensor 513 is on standby (3). When the sensor 513 is turned on, the loop timer is started (4), and when the loop timer times out (5), that is, the original is conveyed for a predetermined time, and the registration roller 514 and the conveyance roller 515 are conveyed.
The leading end of the document is abutted against the nip portion formed by the above to form a loop. As a result, it is possible to eliminate a conveyance obstacle such as skew feeding of a document.

Then, the separation motor 547 is turned off (6), and the loop timer (in this embodiment, the internal timer of the microcomputer 548) for stabilizing the loop after loop formation is started (7), and the loop timer is set in advance. When the time of the set predetermined time is up (8), the separation motor 547 and the carry motor 546 are driven (9), and the carry counter (in this embodiment, the internal timer of the microcomputer 548) is started (10), When the carry counter times up the time of a predetermined time set in advance (11), the separation motor 547 and the carry motor 546 are stopped (12). Next, the final pre-original document detection process, which will be described later, is activated (13), and the separation process ends.

FIG. 8 is a flow chart showing an example of the detailed procedure of the final pre-original document detection processing routine by the microcomputer 548 shown in FIG. Note that (1) to (5) indicate each step.

First, a timer (in this embodiment, an internal timer of the microcomputer 548) for measuring the time corresponding to the fall of the lever 533 is started (1), and the fact that the lever 533 has fallen during the time counting of this timer is started. Sensor 5 to detect
It is determined whether 37 detects the lever drop (2). If YES, it is determined that the original document being separated is the final previous original document, the final previous original signal is turned on to the main body, and the final previous original detection is performed. A confirmation signal is transmitted (5), and the process ends.

On the other hand, if the determination in step (2) is NO, it is determined whether or not the timer has timed out (3). If NO, the process returns to step (2). If YES, the separation process is in progress. If the original is not the last original,
The final previous original signal is turned off to the main body, a final final original detection detection confirmation signal is transmitted (4), and the process ends.

As a result, when the main body receives the final pre-detection end signal, it controls the paper feed timing of the recording medium in the state of the final pre-original signal as described later.

FIG. 9 is a flow chart showing an example of a detailed procedure of a paper feed processing routine by the microcomputer 548 shown in FIG. Note that (1) to (15) indicate each step. First, it is determined whether or not the document discharge processing is in progress (1), and N
If it is O, the process proceeds to step (3) and thereafter, and if it is YES, the paper discharge motor (conveyance motor 546) is driven (2).

As a result, when the sheet discharging process described later is not performed, the transport motor 546 is driven, and at the same time, the belt motor 545 is driven in the normal rotation direction (the direction in which the document is transported onto the platen) (3). ). Next, the pre-registration sensor 513 waits for turning off (4), and the sensor 513
When is turned off, it is determined whether the registration sensor 514 is turned on again while the conveyance is performed for a predetermined distance. Therefore, it is first determined whether the registration sensor is in the off state (5). In the example, the internal timer of the microcomputer 548 is activated (6), and it is determined whether or not the registration sensor is in the ON state (7). If YES, the process returns to step (5), and if NO, the transport counter is for a predetermined time. It is determined whether or not the count of (1) has been counted (8), and if NO, the process returns to step (7). When the check of perforated originals is completed in this way, the final original detection processing routine to be described later is started (9), and the conveyance counter is started to convey the distance to the stop position of the rear end of the originals on the platen. Then, (10) and when the conveyance count of the preset count value is completed (11), the belt motor 545 is stopped (12).

Then, it is judged whether or not the paper discharge process is in progress (1
3) If NO, the process proceeds to step (15), and if YES, the carry motor 546 is turned off (14), a paper feed completion signal is transmitted to the main body (15), and the paper feed process ends.

FIG. 10 is a flow chart showing an example of a detailed procedure of a final document detection processing routine by the microcomputer 548 shown in FIG. Note that (1) to (3) indicate each step.

First, it is determined whether the sensor 537 is in the off state (1), that is, the sensor 537 causes the lever 533 to move.
When it is not detected that the document is being dropped, it is determined that the document being fed is not the final document, a final document signal is sent to the main body (3), the process is terminated, and the sensor 537 is operated by the lever 533. When it is detected that the document is being dropped, the document being processed is determined to be the final document, the final document signal ON is transmitted to the main body (2), and the process ends.

FIG. 11 is a flow chart showing an example of a detailed procedure of a paper discharge processing routine by the microcomputer 548 shown in FIG. Note that (1) to (11) indicate each step.

First, the belt motor 545 is driven in the reverse direction (1). Next, waiting for the reversal sensor 526 to be turned on (2), driving the carry motor 546 (3), starting the carry counter (4), and detecting the carry of a predetermined distance, the carry counter has a predetermined value. Wait until the transport count is completed (5), and when the transport count is completed,
The belt motor 545 is stopped (6), and the reversal sensor 526
Waits until the paper is turned off (7), and the paper discharge sensor 526
Is turned off, it waits until the paper discharge sensor 529 is turned off (8), and if YES, the conveyance counter is started (9), and a predetermined count value (the trailing edge of the document is discharged from the paper discharge roller 532). It waits for counting up (equivalent to the distance to exit) (10), and after counting up, the transport motor 546 is stopped (11), and the paper discharge process ends.

In the above embodiment, the document feeder 35 is used.
3 has been described as being integrally formed with the main body, the present invention can be applied to an image forming system in which the document feeder 353 can be connected to the main body, and the embodiment will be described in detail below. [Second Embodiment] Further, a connectable image forming system, which will be described later, communicates between the controller 300 of the main body and the microcomputer 548 of the document feeding device to determine the mutual operation (status) and perform control. It means a configuration that synchronizes.

Therefore, control signals such as a document feeding (replacement) signal and a document discharging signal are transmitted from the main body to control the operation of the document feeding device. Further, control signals such as a document feeding completion signal, a final document signal, a final previous document detection confirmation signal, and a final previous document signal are received from the document feeding device to control the operation of the main body.

Of these, the final document signal (cycle end signal) is output when the sensor 537 detects that the lever 533 is not on the document through the flag 536 at the completion of document feeding. Further, the last pre-original document signal (printer cycle end signal) is a flag 536 by the sensor 537 when the next document is separated in advance according to the output of the first final document signal after the document feeding is completed and the first-out operation is completed. This is output when it is detected that the lever 533 is not on the document via the.

FIG. 12 is a flow chart showing an example of the overall processing procedure in the image forming apparatus showing the second embodiment of the present invention. Note that (1) to (14) indicate each step.

First, a copy start command from a copy start key (not shown) is awaited (1). Initial processing is performed by the copy start command (2). In the present embodiment, the initial processing is performed by clearing the counters such as the original number counter i, the original synchronous transfer paper count j, the (original) fixed number count k, and the transfer paper number count 1 to “0”, the final original flag, and the final original. The flags such as the previous document flag and the final flag are turned off. Further, pre-processing for performing a designated copy mode such as feeding the first original is performed.

Next, in the transfer paper feed check routine, a check routine for checking whether or not to feed the next transfer paper (following the procedure shown in the flow chart shown in FIG. 13 described later) is executed (13).

Then, it is judged in the check routine whether or not the transfer paper feeding is completed (completed), that is, whether or not the end flag is in the ON state (4), and if YES, the processing is ended. On the other hand, when the determination in step (4) is NO (when the end flag is in the OFF state), the transfer sheet number counter 1 is incremented by "1" (5), and the transfer sheet number counter l
And the designated set number of sheets (register) are equal (6), and if NO, proceed to step (9) and thereafter, and YES
If so, in order to exchange the original for copying the next original,
The transfer paper count l is cleared to "0" (7), and the original synchronous transfer paper count j is incremented by "1" (8).

Next, when the fed transfer paper is conveyed to a position on the conveyance path, the optical system is started,
The optical system is started and waits until the transfer paper reaches the optical system start point position for aligning the image destination of the document with the resist of the transfer paper (9).

Further, in order to continuously feed the transfer paper at the same time, the transfer paper is fed at regular intervals. for that reason,
In step (10), the feeding of the next transfer sheet is waited for a fixed time after the feeding of the previous transfer sheet. Then, when it is time to feed the next transfer sheet, the process returns to step (3).

Either step (9) or (10) may be performed first, depending on the length of the transfer paper transport path and the length of the transfer paper itself.

When the transfer sheet reaches the optical system start point, it is determined whether the final document flag is in the on state (11). That is, here, when the final document flag is ON, it means that the final document detection unit erroneously detects that the document is not the final document. Therefore, if the final document flag is turned on in the determination in step (11), a blank sheet discharge process is performed to discharge, as a blank sheet, the transfer sheet that is excessively fed due to the false detection of the final document (see FIG. 15 described later in detail). (Following the procedure shown in the flow chart) is executed (13), and the fact that the transfer sheet has been discharged due to the false detection of the final document is displayed on the display unit of the operation unit 312 (14), and the process is ended.

On the other hand, if the judgment in step (11) is NO, normal processing is executed (12) and the process returns to step (9).

FIG. 13 is a flow chart showing an example of the detailed procedure of the transfer paper feeding check routine shown in FIG. Note that (1) to (8) indicate each step.

First, the document number counter i and the document synchronous transfer sheet counter j are compared (1). In the present embodiment, the original synchronous transfer paper counter functions as a means for indicating what number of originals (corresponding) when a certain transfer paper is copied (copied).

As a result of the comparison, if the document number counter i is larger than the document synchronous transfer sheet counter j, the transfer sheet may be fed, and therefore the process returns to step (4) shown in FIG.

On the other hand, when the document number counter i is smaller than the document synchronous transfer sheet counter j in the comparison in step (1) (NO), it is determined whether the document number counter i and the document synchronous transfer sheet counter j are equal. (2) If YES, it is determined whether the state of the final document flag is ON (3). If NO, the process returns to step (4) shown in FIG. 12, and if YES, it is the final document. The transfer paper feed flag is turned on (4), and the process returns to step (4) shown in FIG.

On the other hand, if it is determined in step (2) that the document number counter i and the document synchronous transfer sheet counter j are not equal, it is determined whether or not to use the last previous document signal (5 ), If NO, returns to step (2) and waits until the document number counter i and the document synchronous transfer sheet counter j become equal.

On the other hand, if the result of the determination in step (5) is YES, it is determined whether the count k + 1 for determining the presence / absence of an original and the original synchronous transfer paper count j are equal (6), and Y
If it is ES, it is judged whether the state of the last-original document flag is the ON state (7). If NO, that is, the OFF state,
Since there are still originals to be copied, the process returns to step (4) in FIG.

On the other hand, if it is determined in step (7) that the state of the last-before-original flag is ON, it means that the sheet is the last original, so the feeding end flag of the transfer sheet is turned ON (8), Returning to step (4) in FIG.

On the other hand, if it is determined in step (6) that the fixed count count k + 1 and the original synchronous transfer paper count j are not equal, the process returns to step (2) and either step (2) or step (2) is performed. Wait until condition 6) is met. In the present embodiment, the final original document and the final previous original flag are generated by the determination in steps (5) and (9) of the original document processing routine shown in FIG.

FIG. 14 is a flow chart showing an example of a document processing procedure in the image forming apparatus according to the second embodiment of the present invention. Note that (1) to (10) indicate each step.

First, the document feed command is awaited (1). In the present embodiment, the original feeding command is issued when the first original is in the initial processing of step (2) shown in FIG. 12 and the second and subsequent originals are when the optical system scan is reversed. is there.

When the document feeding command is issued, the document feeding is started (the document feeding (replacement) signal is transmitted to the document feeding device) (2), and the document feeding is completed (the document feeding device completes the document feeding). Wait for signal reception) (3).

Next, after the document feeding is completed, the document number counter i is incremented by "1" (4). Next, it is judged whether or not the final original signal (in other words, the cycle end signal or the last original signal) from the original conveying device is in the ON state (5). If NO, the process proceeds to step (7) and thereafter, and if YES, the final Turn on the manuscript flag (6),
It waits until the final previous document confirmation signal (in other words, the pre-cycle pick signal or the last pre-last document confirmation signal) from the document conveying device is turned on (7). When the final pre-original document confirmation signal is turned on, the number k of determinations of the presence or absence of the document is incremented by "1" (8). Next, it is judged whether or not the final original signal (in other words, the pre-cycle end signal or the original document signal before the last) from the original conveying device is in the ON state (9). If NO, the process returns to step (1), and if YES, the final. The previous document flag is turned on (10), and the process returns to step (1).

Although not described in the above flow, when the final original is ejected, the original ejection signal is transmitted to the original conveying device instead of the original feeding (replacement) signal.

FIG. 15 is a flow chart showing an example of a detailed procedure of the blank sheet discharging process shown in FIG. In addition,
(1) to (15) show each step.

First, the process waits until the image formation on the immediately preceding transfer sheet is completed (1). When the image formation just before that is completed,
Since the next transfer paper is ejected as a blank sheet, the optical system is not moved (still stopped at the optical system home position), the document illumination lamp is not turned on, and blank (non-image area deletion) LE is performed.
All of D is turned on (2).

Next, the transfer paper discharged from the blank sheet forms a predetermined loop after detection by the pre-registration sensor (3). Then, the registration roller 22 is turned on to convey the transfer paper (4). Next, after waiting t1 time until the transfer paper reaches the separation charger 25 (5), the separation charger 25 is turned on (6).

Then, after waiting t2 hours until the trailing edge of the transfer paper passes through the registration roller 22, (7),
The registration roller 222 is turned off (8). Then, the process waits until t3 time elapses until the trailing edge of the transfer paper passes through the separation charger 25 (9), and after 3 t, the separation charger 2
Turn off 5 (10).

Then, the leading end of the transfer paper is ejected by the paper ejection roller 33.
After a lapse of t4 time until reaching (11), the motor for driving the paper discharge roller is turned on (12), and the transfer paper is conveyed to the outside of the machine. Next, waiting for t5 hours until the trailing edge of the transfer paper passes through the discharge roller (13),
The paper discharge roller 33 is turned off (14). Then, since the transfer paper has been discharged as a blank paper, the charge (the number of copies) counter is not counted (15) and the process returns to step (14) shown in FIG.

Hereinafter, the modes of the final document detection process and the subsequent process operation in the image forming operation in the document circulation mode, for example, in the state where the sorter 354 is not connected to the main body and the sort mode for a plurality of copies, will be described in detail below. Is divided into a document circulation process 1 to a document circulation process 4, which will be specifically described below. [Document Circulation Processing 1] As described above, even if blank sheets are discharged in the first cycle of the original, the image forming operation after the second cycle of the original is continued if a plurality of copies are requested.
The number of originals in the circulation cycle is counted, and after the second cycle, the final original detection signal (or the final original detection flag) / the final previous original detection signal (or the final previous original detection flag) from the feeder 353 is not used, It is possible to determine the final document after the second circulation based on the number of documents in the first circulation. As a result, if another document is added to or reduced from the document stack when the image formation for the first cycle is interrupted (when the number of documents for the first cycle and the number of documents for the second and subsequent cycles are different), the desired output may not be obtained. However, it is preferable for a user who does not eject a blank sheet and does not reduce the image forming speed, that is, a user who causes 100% productivity to perform an image forming operation. [Document Circulation Process 2] As described above, when a blank sheet is discharged in the first circulation of the document, the copy operation is interrupted (stopped) once.
Then, a message such as "Blank paper has been discharged" is displayed on the display unit (not shown) of the operation unit 312. In this state, if you do not need this blank sheet, remove it and
When the copy start key (as an image formation restart request) is pressed, the copy operation of the second circulation of the document is restarted. [Document Circulation Process 3] Further, without using the final document signal from the feeder 353, the copy speed (productivity) is reduced and blank paper discharge is controlled after the second circulation of the document. Specifically, the judgment that the last previous original signal is not used is passed every time in step (5) shown in FIG. That is, it is determined in step (3) whether the final original of the original bundle is fed by the feeder 35.
The determination is made only by the final document flag based on the final document signal from 3. Therefore, the copy of the first original is completed without feeding the transfer paper more than the transfer paper for the final original (without discharging the blank paper) (steps (11), (13) shown in FIG. 12, (Without passing through 14).

The reason why the copy speed is lowered is that the transfer paper feeding timing of the main body is faster than the judgment of the final original by the final original detecting means of the feeder 353. That is, the loop time in step (2) of the transfer paper feeding check routine shown in FIG. 13 becomes long, and the copy speed is maximized (1
This is because the paper feed timing of the transfer paper (which achieves a productivity of 00%) is delayed (compared with the case of using the pre-final original detection). [Document Circulation Process 4] Similar to the first circulation of the document, this is a process of discharging a blank sheet at the end of each circulation. This is a preferable process for a user who wants to use it as a copy (threshold paper) in which the blank sheet is inserted at the circulation boundary (threshold of a bundle for each copy).

In this case, the blank sheet of the first circulation of the original is discharged in step (13) shown in FIG. 12, and the copying operation of the second circulation of the original is performed until steps (12) and (13). Steps (2) to (13) are similarly repeated for the third and subsequent circulations of the document, and when the desired circulation number, that is, the copy of the number of copies is output, the copy operation is ended.

Hereinafter, the transfer paper check process for the second and subsequent cycles may be performed with reference to the flowchart shown in FIG.

FIG. 16 is a flow chart showing an example of the transfer sheet check processing procedure after the second cycle in the image forming apparatus according to the present invention. Note that (1) to (4) indicate each step.

First, the document number counter i and the document synchronous transfer sheet counter j are compared (1). In the present embodiment, the original synchronous transfer paper counter functions as a means for indicating what number of originals (corresponding) when a certain transfer paper is copied (copied).

As a result of the comparison, if the original number counter i is larger than the original synchronous transfer sheet counter j, the transfer sheet may be fed, so that the process returns to step (4) shown in FIG.

On the other hand, when the document number counter i is smaller than the document synchronous transfer sheet counter j in the comparison in step (1) (NO), it is determined whether the document number counter i and the document synchronous transfer sheet counter j are equal. (2) In the case of YES, it is determined whether or not the number of originals I1 in the first order is equal to the number of originals counter i (3), and if NO, the process returns to step (4) shown in FIG. If so, it is determined that the document is the final document of the n-th document bundle, the end flag is turned on (4), and the process returns to step (4) shown in FIG.

As a result, when returning to the flow shown in FIG. 12, the blank sheet discharge process is executed without performing the steps (11), (13) and (14), and the image forming operation is completed.

In the above embodiment, the case where the operation is terminated by the blank sheet discharge at the output of the error detection of the final preceding document detection has been described. May be discharged, and the discharge at this time may be controlled not to be counted for billing.

In the above embodiment, the case where the main body detects the error of the last previous original detection has been described. However, this error detection is performed by the original conveying device, and an error indicating that the main body has an error has occurred. By providing a signal, that is, when the final document is detected by the document feeder, when the final document is detected, if the final document detection that is activated first does not detect the last previous document, an error occurs. When the error signal is sent to the main body and the main body discharges a blank sheet in response to the reception of the error signal, the same effect as in the above embodiment can be expected.

Further, in the case where an error is detected by the original conveying device, when the paper feeding signal is received from the main body after detecting the error by the original conveying device, the final original on the platen is discharged and the original is fed. Sending a pseudo feed completion signal without paper, and copying the belt section of the document transport device on the main body as if copying the document, so that the previously fed recording medium is ejected. It may be configured to be able to. Further, when transmitting the pseudo feed completion signal, at the same time, an error signal is transmitted, and when the main body receives the error signal, the main body may be controlled to stop the counting process for billing. .

Further, in the above embodiment, the method of switching the operation mode in the main body has been described. However, an error is detected on the side of the document feeder, and the number of documents is determined by the output of this error detection, and the lever is moved. The mode may be switched by outputting the final pre-original signal and the final original signal regardless of the behavior.

Another final pre-original document detecting operation in the image forming apparatus according to the present invention will be described below with reference to the flow chart shown in FIG.

FIG. 17 is a flowchart showing an example of another final pre-original document detection procedure in the image forming apparatus according to the present invention. Note that (1) to (8) indicate each step. Further, each processing is assumed to be executed by the microcomputer 548 shown in FIG.

First, it is determined whether or not the error signal is on in the previous circulation operation (1). If NO, the lever 5
A sensor 5 that activates a timer for just dropping 33 (2) and detects that the lever 533 has dropped during the timer
It is determined whether 37 detects the fall of the lever 533 (3), and if NO, it is determined whether the timer that has already started has timed out (4). If NO, the process returns to step (3), and YES. In this case, it is determined that the document being separated is not the final previous document, the final previous document signal is turned off, the final previous document detection confirmation signal is transmitted to the main body (5), and the process ends.

On the other hand, if the determination in step (3) is YES, it is determined that the original document being separated is the final previous original document, the final previous original signal is turned on, and the final previous original document detection confirmation signal is sent. (8), and the process ends.

On the other hand, if the determination in step (1) is YES, "1" is added to the number counter (6), and it is determined whether the value of the number counter is equal to the final number of sheets (7).
If NO, the process proceeds to step (5), and if YES, the process proceeds to step (8).

Another final pre-original document detecting operation in the image forming apparatus according to the present invention will be described below with reference to the flowchart shown in FIG.

FIG. 18 is a flow chart showing an example of another final document detecting procedure in the image forming apparatus according to the present invention. Note that (1) to (10) indicate each step. Further, each processing is assumed to be executed by the microcomputer 548 shown in FIG.

First, it is determined whether or not the error signal is turned on in the previous document circulation operation (1). If NO, it is determined whether or not the sensor 537 is not detecting the fall of the lever 533 (sensor off state). (2), if YES, "1" is added to the number counter (3), it is determined that the original being fed is not the final original, and the final original signal is set to O.
FF is performed (4), the fact is transmitted to the main body, and the processing is ended.

On the other hand, when the determination in step (2) is NO, that is, when the sensor 537 detects the fall of the lever 533, "1" is added to the number determination counter (5), It is determined whether or not the final pre-original document signal is in the ON state (6), and if YES, the process proceeds to step (8) and thereafter, and if NO, the error signal is turned ON (7). Then, it is determined that the original being fed is the final original, the final original signal is turned on (8), and the fact is transmitted to the main body. Then, the number counter is cleared to "0" (9), and the process ends.

On the other hand, if the judgment in step (1) is YES, it is judged whether or not the last previous document signal is ON (10). If YES, the process returns to step (8), and if NO. If so, return to step (4).

Further, in the above embodiment, the method of switching the operation mode in the main body has been described. However, an error is detected on the side of the document conveying device, and the output of this error detection causes the output of the last previous document signal without outputting it. Alternatively, the mode may be switched by outputting only the final document signal.

Other final document detection processing and final document detection processing operation in the image forming apparatus according to the present invention will be described below with reference to the flowcharts shown in FIGS.

FIG. 19 is a flowchart showing an example of still another final pre-original document detecting procedure in the image forming apparatus according to the present invention. Note that (1) to (6) indicate each step. Further, each processing is assumed to be executed by the microcomputer 548 shown in FIG.

First, it is judged whether or not the error signal is turned on in the previous document circulation operation (1). If YES, the process is ended, and if NO, a timer for measuring the time for which the lever 533 is dropped. (2) is started, and it is determined whether or not the sensor 537 for detecting the fall of the lever 533 has detected the fall of the lever 533 during the timer activation, that is, whether or not the sensor 537 is in the OFF state. (3) If YES, it is determined that the document being separated is the last previous document, and the last previous document signal is turned on.
The final pre-original document detection confirmation signal is turned on (6) and the fact is transmitted to the main body.

On the other hand, if the judgment in step (3) is NO, it is judged whether or not the timer which has already started has timed out (4). If NO, the process returns to step (3) and YE
If it is S, it is determined that the original document being separated is not the final previous original document, the final previous original document is turned off, the final previous original document detection confirmation signal is turned on (5), the fact is transmitted to the main body, and the process is ended. To do.

As a result, the main body side controls to switch the paper feed operation mode when the final original signal is received without receiving the final previous original detection end signal.

FIG. 20 is a flow chart showing an example of still another final document detecting procedure in the image forming apparatus according to the present invention. Note that (1) to (5) indicate each step. Further, each processing is assumed to be executed by the microcomputer 548 shown in FIG.

First, whether the sensor 537 is in the off state of the lever 533, that is, the sensor 537 is in the lever 533 state.
It is determined whether or not a drop of paper has been detected (1). If NO, it is determined that the original being fed is not the final original,
The final document signal is turned on (2), a message to that effect is transmitted to the main body, and the processing is terminated.

On the other hand, if the result of the determination in step (1) is YES, it is determined that the original being fed is the final original, the final original signal is turned on (3), and the fact is transmitted to the main body. Then, it is determined whether or not the last previous document signal is in the ON state (4). If YES, the process is ended, and if NO, the error signal is turned ON (5) and the process is ended. As described above, according to the above-described embodiment, even if the final document detection error occurs, not only it is possible to control the image formation on the precedingly fed recording medium by the output of the error determination means, Further, it becomes possible to control the image formation after the error determination output, and it is possible to form the desired number of copies.

Further, since the image formation can be continuously performed without interruption of the image formation operation due to the output of the error judgment, the time during the use of the apparatus can be effectively utilized.

Furthermore, when a plurality of sets of images are formed by circulation of the document feeder, the mode is switched to the mode of feeding the recording medium for the number of documents detected by the document number detecting means in accordance with the output of the error determination. As a result, it is possible to perform the image forming operation without discharging a wasteful recording medium to the output bundle after the second circulation and without lowering the image forming speed.

Further, by suspending the image forming operation by outputting the error judgment, it is possible to notify the user of the apparatus of the occurrence of the error and to select whether or not to continue the image forming. Becomes

Further, when a plurality of sets of images are formed by circulating the originals of the original conveying device, it is possible to switch the mode of feeding the recording medium according to the output of the final original detecting means in accordance with the output of the error determination. Therefore, it is possible to perform the image forming operation without discharging the wasteful recording medium to the output bundle after the second circulation.

Further, when a plurality of copies of an image are formed by circulating the originals of the original conveying device, a blank sheet is always ejected at the end of every original circulation. Therefore, the ejected blank sheet should be used as a threshold sheet for each output bundle. You can

Further, the output of the error determining means makes it possible to control the image formation on the recording medium previously fed, and informs the user that the final pre-original document detecting means did not output correctly. It is possible to make sure notification and take appropriate action.

[0165]

As described above, according to the first aspect of the invention, the control means activates the discharge processing means and the switching means in accordance with the determination result of the error determination means, and sets the number of copies for image formation by the image forming means. Even if an error occurs in the detection of the last document in the document stack, the recording medium that was previously fed is ejected to the outside of the machine, and it is based on the number of documents detected so far. It is possible to accurately continue the image formation of the subsequent copies until the image formation of the set number of copies is completed without interruption.

According to the second invention, after the control means activates the discharge processing means and the switching means in accordance with the judgment result of the error judgment means, the image formation by the image forming means is interrupted and the image formation with respect to the image forming means is carried out. Since the input of the restart request is judged and the interrupted image formation is restarted, the previously fed recording medium is ejected to the outside of the machine, the image formation is temporarily stopped based on the final document detection error, and the restart request is issued thereafter. If so, it is possible to accurately continue the image formation of the subsequent number of copies based on the number of detected originals until the image formation of the set number of copies is completed without interruption.

According to the third invention, the control means activates the discharge processing means and the switching means in accordance with the judgment result of the error judging means, and the image forming by the image forming means is continued until the set number of copies is completed. Discharging the printed recording medium to the outside of the machine and accurately continuing the image formation of the subsequent number of copies based on the output of the final document detecting means until the image formation of the set number of copies is completed without interruption. You can

According to the fourth aspect of the invention, after the control means activates the discharge processing means and the switching means in accordance with the determination result of the error determination means, the image forming by the image forming means is interrupted and the image forming is performed. Since the input of the image formation restart request to the means is determined and the interrupted image formation is restarted, the recording medium previously fed is ejected to the outside of the machine, and the image formation is temporarily stopped based on the final document detection error. After that, if there is a restart request, it is possible to accurately continue the image formation of the subsequent number of copies based on the output of the final document detecting means without interrupting the image formation of the set number of copies.

According to the fifth invention, the control means activates the discharge processing means in accordance with the judgment result of the error judging means,
Since the image formation by the image forming means is continued until the set number of copies is completed, even if an error occurs in the detection of the last previous document, thereafter, the recording medium previously fed is ejected to the outside of the machine and the image formation of the subsequent number of copies is performed. After that, it is possible to continue accurately until the image formation for the set number of copies is completed without interruption.

According to the sixth aspect of the invention, after the control means activates the discharge processing means in accordance with the determination result of the error determination means, the image formation by the image forming means is interrupted and the image formation is performed on the image forming means. Since the interrupted image formation is restarted after the input of the restart request is judged, the temporary image formation is interrupted while ejecting the precedingly fed recording medium to the outside of the machine every time, even if the last previous document detection becomes an error. However, if a restart request is issued thereafter, it is possible to accurately repeat the image formation for the subsequent number of copies until the image formation for the set number of copies is completed.

According to the seventh aspect of the invention, the error processing means controls the activation of the image forming means based on the judgment result of the error judging means to eject the precedingly fed recording medium to the outside of the machine to finish the image formation. Therefore, it is possible to discharge the remaining recording medium to the outside of the apparatus to reliably notify the occurrence of an error and prepare for normal image formation thereafter.

According to the eighth invention, the error processing means is
Since the recording medium previously fed is discharged as it is to the outside of the machine while the image formation by the image forming means is stopped, the remaining recording medium is discharged to the outside of the machine while stopping the image forming means to ensure the occurrence of an error. It is possible to notify the user and prepare for normal image formation thereafter.

In the ninth image forming apparatus according to the present invention, the error processing means suspends the document transportation by the document transporting means, forms an image on the previously fed recording medium without a document, and discharges the image outside the apparatus. Therefore, while the image forming unit is normally driven, the remaining recording medium is ejected to the outside of the apparatus to reliably notify the occurrence of an error and prepare for normal image formation thereafter.

According to the tenth aspect of the invention, the error determining means determines that the final original detection error occurs when the final previous original detecting means has not detected the final original before the final original detecting means detects the final original. Since the determination is made, it is possible to reliably detect the pre-final document detection error.

Therefore, even if an error occurs in the detection of the final document, it is possible to efficiently form images for the number of copies set based on the restart request input continuously or temporarily. Play.

[Brief description of drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of an image forming apparatus in an image forming apparatus according to a first exemplary embodiment of the present invention.

FIG. 2 is a block diagram illustrating a control configuration of the image forming apparatus illustrated in FIG.

FIG. 3 is a cross-sectional view illustrating the configuration of the feeder shown in FIG.

FIG. 4 is an enlarged sectional view of an essential part for explaining the structure of the recycle lever shown in FIG.

5 is a block diagram of a control system of the feeder shown in FIG.

FIG. 6 is a flowchart showing an example of a document conveyance processing procedure by the microcomputer shown in FIG.

7 is a flowchart showing an example of a detailed procedure of a separation processing routine by the microcomputer shown in FIG.

8 is a flowchart showing an example of a detailed procedure of a final pre-original document detection processing routine by the microcomputer shown in FIG.

9 is a flowchart showing an example of a detailed procedure of a paper feed processing routine by the microcomputer shown in FIG.

10 is a flowchart showing an example of a detailed procedure of a final document detection processing routine by the microcomputer shown in FIG.

11 is a flowchart showing an example of a detailed procedure of a paper discharge processing routine by the microcomputer shown in FIG.

FIG. 12 is a flowchart showing an example of the overall processing procedure in the image forming apparatus showing the second embodiment of the present invention.

13 is a flowchart showing an example of detailed procedures of a transfer paper feeding check routine shown in FIG.

FIG. 14 is a flowchart showing an example of a document processing procedure in the image forming apparatus according to the second embodiment of the present invention.

15 is a flowchart showing an example of a detailed procedure of a blank sheet discharge process shown in FIG.

FIG. 16 is a flowchart showing an example of a transfer paper check processing procedure after the second circulation in the image forming apparatus according to the present invention.

FIG. 17 is a flowchart illustrating an example of another final pre-original document detection procedure in the image forming apparatus according to the present invention.

FIG. 18 is a flowchart showing an example of another final document detection procedure in the image forming apparatus according to the present invention.

FIG. 19 is a flowchart showing an example of still another final pre-original document detection procedure in the image forming apparatus according to the present invention.

FIG. 20 is a flowchart showing an example of still another final document detection procedure in the image forming apparatus according to the present invention.

[Explanation of symbols]

 300 Controller 300a CPU 305 Motor control unit 306 Motor 307 DC load control unit 308 Sensors 353 Feeder

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Toshio Yokota 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (10)

[Claims] 1. A document table on which a stack of documents is placed, a paper feed unit that conveys the placed documents to an image reading unit, and a paper ejection unit that ejects and conveys the documents conveyed to the image reading unit. Equipped with
In an image forming apparatus having a circulation type document conveying means for bundling the respective documents discharged from the sheet discharging section on a document table and an image forming means for reading image information and forming an image on a recording medium, the document is conveyed from the document table. A final document detecting unit that detects the final document in the document stack, a document number detecting unit that detects the number of documents based on the output of the final document detecting unit, and a document placed on the image reading unit as a first document. The original, the original placed on the original table conveyed subsequently to the first original is the second original, and the recording medium fed corresponding to the second original is the first recording medium. , A pre-final original that detects whether the second original is the final paper before the feeding of the second recording medium is started when the recording medium following the first recording medium is the second recording medium Based on the detection means and the output of this final front original detection means. Switching means for switching the first paper feed mode for carrying out the paper feed control of the second recording medium to the second paper feed mode for carrying out the paper feed control of the recording medium according to the signal from the document number detecting means, An error determination unit that determines the last front original detection error occurrence state based on the output of the final original detection unit and the output of the final front original detection unit, and a recording medium that is previously fed to a predetermined position outside the machine. A discharge processing unit that discharges and conveys, and a control unit that activates the discharge processing unit and the switching unit according to the determination result of the error determination unit and controls the image forming by the image forming unit to continue until the set number of copies is completed. An image forming apparatus comprising: 2. A document table on which a stack of documents is placed, a paper feed unit which conveys the placed documents to an image reading unit, and a paper ejection unit which ejects and conveys the documents conveyed to the image reading unit. Equipped with
In an image forming apparatus having a circulation type document conveying means for bundling the respective documents discharged from the sheet discharging section on a document table and an image forming means for reading image information and forming an image on a recording medium, the document is conveyed from the document table. A final document detecting unit that detects the final document in the document stack, a document number detecting unit that detects the number of documents based on the output of the final document detecting unit, and a document placed on the image reading unit as a first document. The original, the original placed on the original table conveyed subsequently to the first original is the second original, and the recording medium fed corresponding to the second original is the first recording medium. , A pre-final original that detects whether the second original is the final paper before the feeding of the second recording medium is started when the recording medium following the first recording medium is the second recording medium Based on the detection means and the output of this final front original detection means. Switching means for switching between a first paper feed mode for carrying out paper feed control for the second recording medium and a second paper feed mode for carrying out paper feed control for the recording medium in response to a signal from the document number detecting means. An error determination unit that determines the state of the last front document detection error occurrence based on the output of the last document detection unit and the output of the last front document detection unit, and a recording medium that is fed to a predetermined position in advance outside the machine. After the discharge processing means that discharges and conveys the image, the discharge processing means and the switching means are activated in accordance with the determination result of the error determination means, the image formation by the image forming means is interrupted, and the image formation for the image forming means is performed. An image forming apparatus, comprising: a control unit that determines the input of a restart request and restarts the interrupted image formation. 3. A document table on which a stack of documents is placed, a paper feed unit which conveys the placed documents to an image reading unit, and a paper ejection unit which ejects and conveys the documents conveyed to the image reading unit. Equipped with
In an image forming apparatus having a circulation type document conveying means for bundling the respective documents discharged from the sheet discharging section on a document table and an image forming means for reading image information and forming an image on a recording medium, the document is conveyed from the document table. Final document detecting means for detecting the final document in the document stack, and the document placed on the image reading section as a first document, and the document is placed on a document table conveyed subsequently to the first document. When the manuscript is the second manuscript, the recording medium fed corresponding to the second manuscript is the first recording medium, and the recording medium following the first recording medium is the second recording medium, Before starting the feeding of the second recording medium, the second
Before-final document detecting means for detecting whether or not the document is the last sheet, and a first paper-feeding mode for carrying out paper-feeding control of the second recording medium based on the output of this last-before-document detecting means Based on the output of the final original detection unit and the output of the final previous original detection unit, the switching unit switches between the second paper feeding mode for controlling the paper feeding of the recording medium in response to the signal of the original detection unit. Error determination means for determining a state of occurrence of a front original detection error, discharge processing means for discharging and transporting a recording medium which is previously fed to a predetermined position to the outside of the machine, and the discharge according to the determination result of the error determination means. An image forming apparatus comprising: a processing means and the switching means, and a control means for controlling the image formation by the image forming means to continue until the set number of copies is completed. 4. A document table on which a stack of documents is placed, a paper feed unit which conveys the placed documents to an image reading unit, and a paper ejection unit which ejects and conveys the documents conveyed to the image reading unit. Equipped with
In an image forming apparatus having a circulation type document conveying means for bundling the respective documents discharged from the sheet discharging section on a document table and an image forming means for reading image information and forming an image on a recording medium, the document is conveyed from the document table. Final document detecting means for detecting the final document in the document stack, and the document placed on the image reading section as a first document, and the document is placed on a document table conveyed subsequently to the first document. When the manuscript is the second manuscript, the recording medium fed corresponding to the second manuscript is the first recording medium, and the recording medium following the first recording medium is the second recording medium, Before starting the feeding of the second recording medium, the second
Before-final document detecting means for detecting whether or not the document is the last sheet, and a first paper-feeding mode for carrying out paper-feeding control of the second recording medium based on the output of this last-before-document detecting means Based on the output of the final original detection unit and the output of the final previous original detection unit, the switching unit switches between the second paper feeding mode for controlling the paper feeding of the recording medium in response to the signal of the original detection unit. Error determination means for determining a state of occurrence of a front original detection error, discharge processing means for discharging and transporting a recording medium which is previously fed to a predetermined position to the outside of the machine, and the discharge according to the determination result of the error determination means. Control means for interrupting image formation by the image forming means after activating the processing means and the switching means, determining an input of an image formation restart request to the image forming means, and restarting the interrupted image formation. Image forming apparatus characterized by Bei was. 5. A document table on which a stack of documents is placed, a paper feed unit which conveys the placed documents to an image reading unit, and a paper ejection unit which ejects and conveys the documents conveyed to the image reading unit. Equipped with
In an image forming apparatus having a circulation type document conveying means for bundling the respective documents discharged from the sheet discharging section on a document table and an image forming means for reading image information and forming an image on a recording medium, the document is conveyed from the document table. Final document detecting means for detecting the final document in the document stack, and the document placed on the image reading section as a first document, and the document is placed on a document table conveyed subsequently to the first document. When the manuscript is the second manuscript, the recording medium fed corresponding to the second manuscript is the first recording medium, and the recording medium following the first recording medium is the second recording medium, Before starting the feeding of the second recording medium, the second
Before-final original detection means for detecting whether or not the original is the last paper, and an error for determining the state of occurrence of the final-before-origin detection error based on the output of the final-original-document detection means and the output of the-final-before-origin-document detection means. Determination means, discharge processing means that discharges and conveys the recording medium that has been fed to a predetermined position to the outside of the machine, and activates the discharge processing means according to the determination result of the error determination means, and the image forming means An image forming apparatus, comprising: a control unit that controls the image formation by the method to continue until the set number of copies is completed. 6. A document table on which a stack of documents is placed, a paper feed unit which conveys the placed documents to an image reading unit, and a paper ejection unit which ejects and conveys the documents conveyed to the image reading unit. Equipped with
In an image forming apparatus having a circulation type document conveying means for bundling the respective documents discharged from the sheet discharging section on a document table and an image forming means for reading image information and forming an image on a recording medium, the document is conveyed from the document table. Final document detecting means for detecting the final document in the document stack, and the document placed on the image reading section as a first document, and the document is placed on a document table conveyed subsequently to the first document. When the manuscript is the second manuscript, the recording medium fed corresponding to the second manuscript is the first recording medium, and the recording medium following the first recording medium is the second recording medium, Before starting the feeding of the second recording medium, the second
Before-final original detection means for detecting whether or not the original is the last paper, and an error for determining the state of occurrence of the final-before-origin detection error based on the output of the final-original-document detection means and the output of the-final-before-origin-document detection means. The determination means, the discharge processing means that discharges and conveys the recording medium that is fed to a predetermined position in advance to the outside of the machine, and the discharge processing means is activated according to the determination result of the error determination means, and then the image formation is performed. An image forming apparatus comprising: a control unit that interrupts image formation by the image forming unit, determines an input of an image formation restart request to the image forming unit, and restarts the interrupted image forming. 7. A document table on which a stack of documents is placed, a paper feed unit which conveys the placed documents to an image reading unit, and a paper ejection unit which ejects and conveys the documents conveyed to the image reading unit. Equipped with
In an image forming apparatus having a circulation type document conveying means for bundling the respective documents discharged from the sheet discharging section on a document table and an image forming means for reading image information and forming an image on a recording medium, the document is conveyed from the document table. Final document detecting means for detecting the final document in the document stack, and the document placed on the image reading section as a first document, and the document is placed on a document table conveyed subsequently to the first document. When the manuscript is the second manuscript, the recording medium fed corresponding to the second manuscript is the first recording medium, and the recording medium following the first recording medium is the second recording medium, Before starting the feeding of the second recording medium, the second
Second original document detecting means for detecting whether or not the original document is the last sheet, and the second before the last original document detecting means.
Error determining means for determining a state of occurrence of a final front original detection error based on the output of the final original detection means and the output of the final front original detection means during image formation in the mode of feeding the recording medium. And an error processing unit for controlling the start-up of the image forming unit based on the determination result of the error determination unit and ejecting the previously fed recording medium to the outside of the apparatus to finish the image formation. Image forming apparatus. 8. The image forming apparatus according to claim 7, wherein the error processing unit ejects the recording medium previously fed in a state where the image forming by the image forming unit is stopped, to the outside of the apparatus as it is. 9. The method according to claim 7, wherein the error processing means suspends the document transportation by the document transporting means, forms an image on the previously fed recording medium without a document, and discharges the image outside the apparatus. Image forming apparatus. 10. The error determination means determines a final document detection error when the final front document detection means does not detect the final front document at the time when the final document detection means detects the final document. The image forming apparatus according to claim 9.