JPH0680276A - Automatic document conveying device - Google Patents

Abstract

PURPOSE:To release a jamming without opening and closing a jam access cover or a document conveying member, so as to improve the workability, by releasing a jamming signal by detecting that a document having a misfeeding is removed and documents are loaded to a document feeding part again. CONSTITUTION:When a document D generates a misfeeding between an empty sensor 7 and a resist sensor 8, for example, a jamming signal and an error code signal are transmitted from an ADF processor to a main processor, and the jamming generating position is displayed on an operation panel. When the document making the cause of the jamming is picked up, the resist sensor 8 is turned OFF. Then, a document D is set to a paper feeding tray 2 again, and the empty sensor 7 is turned OFF. The ADF processor receives those signals, and transmits a document setting signal to the main processor, and the main processor receives this signal and releases the jamming.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic document feeder mounted on an electronic copying machine or the like, and more particularly to an automatic document feeder which simplifies jam clearance.

[0002]

2. Description of the Related Art In a conventional automatic document feeder, when a jam occurs due to a paper feed error during document transport, the jam access cover or the transport section has to be opened and closed when the jam is released. However, if a paper feed error occurs between the pickup roller that picks up the originals one by one from the original supply unit and the registration sensor that detects the alignment of the originals, the relevant originals are removed to substantially eliminate the jam. ing. Therefore, it is a waste of time to open and close the transport unit to clear the jam.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to remove a jammed document in the conveying section and set it again in the document supply section to clear the jam and improve workability. An object of the present invention is to provide an automatic document feeder.

[0004]

In order to achieve this object, an automatic document feeder according to the present invention is a document feeder for feeding a document from a document feeder to an image forming position, and a paper feed in the document feeder. A means for detecting a mistake, a means for issuing a jam occurrence signal based on a paper feed error detection signal from the paper feed error detection means, a means for detecting the presence / absence of a document in the document feeding section, and a document feed The jam clearance signal is detected based on the means for detecting that the document is reloaded in the document feeding section, the detection signal for detecting that there is no document in the document feeding section, and the detection signal for detecting that the document is reloaded in the document feeding section. And means for emitting.

[0005]

According to the automatic document feeder of the present invention, when a document feeding error is detected in the document feeding unit that feeds a document from the document feeding unit to the image forming position, the document in the document feeding unit is removed, and When the originals are reloaded on the original supply unit, these are detected and a jam release signal is issued.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of an automatic document feeder installed in an electronic copying machine.

This automatic document feeder is provided with a supply section S for sequentially separating the set originals D one by one, and supplying the originals D supplied from the supply section on the original table 1, that is, an electronic copying machine. To the reversing and discharging section R from the original placing table 1 after the exposure in the electronic copying machine is completed, and from this conveying section. The reversing and discharging section R for reversing or discharging the document D is provided as necessary. This apparatus is provided so as to be openable and closable with respect to the document placing table 1, and also serves as a document placing table cover.

The feeding section S includes a paper feed tray 2 for setting a plurality of originals D in a stacked state, a pickup roller 3 for taking out the originals D set on the paper feed tray 2 one by one,
A pickup roller 3 is provided with a separating roller 4 for sending out the original D, a separating pad 5 in contact with the separating roller 4, and a pair of aligning rollers 6 for aligning and conveying the original D sent out by the separating roller 4. An empty sensor 7 for detecting the presence / absence of the document D is provided on the side of the separation roller 4 of the sheet feeding tray 2, a registration sensor 8 is provided in front of the aligning roller pair 6, and a document D is provided behind the aligning roller pair 6. The size sensors 9 for detecting the size of each are provided.

In the transport section T, an endless transport belt 12 is provided which is wrapped around the belt rollers 10 and 11 and transports the supplied document D along the document mounting table 1, and the transport belt 12 is mounted on the document mounting table 1. Belt pressing rollers 13 for pressing the respective rollers are provided.

The reversing and discharging section R is provided with a reversing roller group 14 for receiving the document D conveyed from the conveying section, reversing the front and back thereof and guiding it to the conveying section, and a discharge roller 17 for guiding the document D to a sheet discharge tray 18. There is. A discharge sensor 15 is provided in the middle of the reversing roller group 14. A flapper 16 is provided between the paper discharge roller 17 and the reversing roller group 14. By driving this flapper 16, the document D from the transport unit is sent back to the transport unit, or the document D from the transport unit is transferred to the paper discharge tray 18. To guide. Normally, the document D from the transport section is used for the paper output tray 18
It is set so as to lead to, and is driven by a flapper solenoid (not shown).

Reference numeral 19 is an ADF open sensor for detecting the opening / closing of the document placing table 1 by the present apparatus, and 20 is a cover open sensor for detecting the opening / closing of the opening / closing cover covering the supply section. , 21 is the document table 1
A document stopper for positioning the upper document. FIG. 2 is a schematic view of an electronic copying machine equipped with this automatic document feeder. The electronic copying machine is provided with the document placing table 1 on its upper part, and the above-mentioned automatic document feeding device is mounted thereon.

Inside the table 1 (that is, the lower side in FIG. 2), a lamp 22 for illuminating the document D and a lamp 22 are provided.
A toothed belt (not shown) having a reflecting plate 24 for condensing the illumination light generated from the document D on the document D and a first mirror 26 for reflecting the light reflected from the document D toward a second carriage 30 described later. And the like, and a first carriage 28 that is movably arranged in parallel with the mounting table 1 by a pulse motor (not shown), and reflected light from the document D that is arranged at right angles to each other and reflected by the first carriage. A second mirror 32 and a third mirror, which are reflected toward a photoreceptor described later.
34, and is driven by the first carriage 28 via a toothed belt (not shown) that drives the first carriage 28, and is moved at a speed of 1/2 with respect to the first carriage. The second carriage 30 is disposed. Further, below the first carriage 28, in a plane including the optical axis of the light folded back through the second carriage 30, it is movably formed through a drive mechanism (not shown). While focusing the reflected light from the carriage 30 and moving the reflected light from the carriage 30, the imaging lens 36 forms an image of the reflected light at a desired magnification, and the reflected light is folded back toward a photoreceptor 40 described later. A fourth mirror 38, which is movable along the optical axis by a driving mechanism (not shown), is arranged in order to form an image at a desired position on the photoconductor 40 and to correct the variation of the focal length due to the movement of the lens 36. Has been done. It should be noted that the reflected light is a character or figure written on the original D, that is, the original D.
It goes without saying that it is the image information above.

Under the lens 36, that is, near the center of the copying machine, the light guided by the fourth mirror 38 is imaged to form a charge distribution pattern, that is, an electrostatic latent image. The photoconductor 40 is arranged. Around the photoconductor 40, a charging device 42 for charging the photoconductor 40 with a predetermined electric charge, and an electrostatic latent image formed on the photoconductor 40 are tonered.
Has a developing device 44 for visualizing the toner image and an AC voltage applying device 46a for separating the paper P from the photoconductor, and supplies a toner image formed on the photoconductor 40 from a feeding / discharging unit described later. The transfer device 46 for transferring the transferred material, that is, the copy sheet P, and the charge distribution in the photoconductor 40 are removed, the charging characteristics of the photoconductor 40 are returned to the initial state, and the residual toner is scraped off. The training devices 48 are arranged in order. Needless to say, the photoconductor 40
Since the latent image formed on the sheet is converted into a toner image via the developing device 44, the image information contained in the document D is copied as a toner image and output on the paper P. It

Paper cassettes 50a and 50b for supplying a material to be transferred, such as copy paper P, postcards, OHP sheets, and the like, toward the photoconductor 40 are inserted on the right side of the copying machine.

The left side of the copying machine, that is, the position corresponding to the downstream side in the rotation direction of the photoconductor 40 (in FIG. 2, the left side of the apparatus main body, that is, the copy sheet P is generally supplied from one end of the copying machine. The discharge tray 52a on which the image (toner image) formed on the photoconductor 40 is transferred, and the fixed copied paper P is stocked, It is arranged.

Inside the copying machine, between the photoconductor 40 and the paper cassettes 50a and 50b, further,
A pair of first and second sheet feeding rollers 51a and 51b for pulling out the sheets P one by one from the cassettes 50a and 50b, respectively, are formed to feed the sheet P toward the photoconductor 40. First and second transport rollers 53a, 5 for sending
3b, each of which is formed by a pair of guide plates and which feeds the paper P from the transport rollers 53a and 53b toward the photoconductor 40 and corrects the inclination of the paper P, and A pair of timing rollers for aligning the leading edge of the image formed on the photoconductor and the leading edge of the paper P, which will be described later, and feeding the paper P at the same speed as the rotation speed of the photoconductor 40.
La 55 is arranged. In addition, in the copying machine, the toner image formed on the photoconductor 40 is transferred between the photoconductor 40 and the discharge tray 52a, and the toner is electrostatically attached. Conveying device 5 for conveying the paper P
6, a fixing device 58 for melting and fixing the toner transferred onto the paper P, and a pair of discharge rollers 52 for discharging the paper P on which the toner image is fixed to the outside of the apparatus.

FIG. 3 is a block diagram showing the overall control system of the automatic document feeder configured as described above and the electronic copying machine equipped with the automatic document feeder. 121
Is the main processor that mainly controls the main body of the electronic copying machine,
An ADF processor 122 mainly controls the automatic document feeder, and these elements exchange various interface signals (which will be described in detail later) with each other.

The main processor 121 has input switches 12 such as various keys on an operation panel (not shown) via an input interface 123 such as a data selector.
4. Various detectors (switches, sensors, etc.) 125 required for other control are connected. Further, the main processor 121 includes a driver 127 that drives a display unit 126 such as various indicators on the operation panel, a lamp control unit 128 that controls the exposure lamp 22 and the like, various drive systems (main motor, clutch, solenoid, etc.). A driver 130 that drives 129, a high-voltage power supply unit 132 that drives various chargers 131, and the like are connected.

The ADF processor 122 is connected to the empty sensor 7, the registration sensor 8, the size sensor 9, the discharge sensor 15, the ADF open sensor 19, the copper open sensor 20, and the like.

Further, the ADF processor 122 includes a paper feed motor 140 for driving the pickup roller 3 and the separation roller 4, a conveyor belt 12 of the conveyor section, an aligning roller 6, a reversing roller 14, and a paper ejection roller 17.
Conveyor motor 141 for driving the etc., Conveyor motor 1
A clutch 142 for transmitting the drive from 41 to the aligning roller 6 and drivers 150, 151, 152, 153 for driving a flapper solenoid 143 for driving the flapper 16 are connected. Further, a first pulse generator 144 and a second pulse generator 145 are connected to the ADF processor. The first pulse generator 144 generates a flock pulse by a rotary encoder attached to the paper feeding motor 140. The second pulse generator 145 generates a clock pulse by a rotary encoder attached to the carry motor 141. Here, interface signals exchanged between the main processor 121 and the ADF processor 122 will be described.

The interface signal transmitted / received between the main processor 121 and the ADF processor 122 is performed by an asynchronous serial communication system, and the interface signal transmitted from the main processor 121 to the ADF processor 122 is DF-TxD60, ADF processor 122. The interface signal transmitted from the main processor 121 to the main processor 121 is transferred through the DF-RxD 61.

There are seven interface signals from the main processor 121 to the ADF processor 122, and a double / single-sided selection signal (ORG-RO) output for setting the double-sided original conveyance mode or the single-sided original conveyance mode.
TH), a document feed signal (ORG-IN) output to start the document replacement operation, and a document discharge signal (ORG-OU) output to discharge the document on the conveyance path.
T), whether the document transport device is in the normal document transport mode,
A mode signal (MODE) that is output to indicate whether the test mode is set, and a code signal that is transmitted when the document feeder is in the test mode to output various test operations. A code signal (TEST), an adjustment code signal (ADJUST) output to adjust the carry amount of a document to be transported when the document transport device is in the normal document transport mode, An aging signal (AGIN) that is output to perform an operation at the same timing as when the document is conveyed.
G) etc.

Further, there are ten interface signals (signals indicated by the document feeder) from the ADF processor 122 to the main processor 121, and the document D is the paper feed tray 2.
Original setting signal (ORG-
RDY), jam signal (D
F-JAM), an error signal (DF-ERR) and an error signal (DF-ERR) indicating that an operation abnormality has occurred in the paper feed motor 40 of the document feeder or the feed motor 41.
Alternatively, when a jam signal (DF-JAM) is output, an error code signal (ERR-COD) that encodes the error or the content of the jam and indicates it to the main body of the copying machine is used. A DF in-motion signal (DF-ACT) output until the end of detection, a document stop signal (ORG-STP) indicating that the document is set at the exposure position, an open / close cover of the transport unit or the paper feed unit of the document transport device. DF open signal (D
F-OPN), a document size signal (SIZE0, SIZE1, SIZE) for indicating the document size with a 4-bit code.
E2, SIZE3), during the two-sided document conveyance operation, a document front / back signal (ORG-FACE) indicating whether the first face of the document is set downward or the second face is set at the exposure position, the document is There is a first-out signal (PRE-FED) for indicating whether or not it is at the first-out position.

FIG. 15 shows an operation panel 200 of the copying machine, which is provided with various input switches 124, various detectors 145, and various display sections 126 of the main processor 121 shown in FIG. In FIG. 17, 201 is A3, A4, A5, B
Switches and display LEDs for determining various paper sizes such as 4, B5 and the like, 202 a display panel for displaying a jam of an original, 203 an interrupt key, 204 a display panel for displaying various messages, 205 a ten key, 206 an original A switch for instructing various operations related to the carrier device, 20
7 is a switch for instructing various operations on the copying machine, 2
Reference numeral 08 denotes a switch and a display LED for determining various document sizes such as A3, A4, A5, B4, B5.

Next, the operation in such a configuration will be described. FIG. 4 is a flow chart showing a paper feed operation control, FIG. 5 is a paper feed operation and a first-out operation, FIG. 6 is a paper discharge operation and a first-out paper discharge operation, FIG. 7 is a conveyance operation, and FIG. . FIGS. 9 and 10 are for single-step step conveyance, and FIGS. 11 and 12 are for single-step step conveyance.
3 and FIG. 14 sequentially show the steps of carrying a document when carrying both sides. 9 to 14 (1) is the first original,
(2) shows the second original, (3) shows the third original, and A to I show the carrying process.

First, when a power switch (not shown) is turned on, after a lapse of a predetermined time, the main body of the copying machine becomes ready (copyable). At this time, the main processor 121 is in a state capable of accepting a copy key provided on the operation panel, and is in a state capable of transmitting / receiving an interface signal between the main processor 121 and the ADF processor 122.

In this state, the operation during single-sided document conveyance will be described with reference to FIGS. 9, 10 and 11 and 14 together with FIGS. When the document D is set on the paper feed tray 2, the empty sensor 7 is turned on to detect the presence of the document (see FIG. 9A). Then, the ADF processor 122 outputs the ORG-RDY signal to the main processor 121. Here, when the copy key is turned on, the main processor 121 outputs an ORG-IN signal.

The ADF processor 122 uses this ORG-I.
When the N signal is received, the DF-ACT signal is turned on and the ORG-STP signal is turned off, and the document feeding operation of the document feeding device is started. That is, the paper feed motor 140 is turned on, thereby driving the pickup roller 3 and the separation roller 4, and one original D set on the paper feed tray 2 is taken out from below and conveyed to the aligning roller 6. After a lapse of a certain time after the leading edge of the conveyed document D is turned on, the paper feed motor 140 is stopped and the document D is aligned by the aligning roller 6 (FIG. 9).
(See B). Next, the transport motor 141 is rotated in the forward direction to rotate the transport belt 12, the reversing roller group 14, and the discharge roller 17 in the discharge direction to perform the document discharge operation. This takes into consideration the case where there is a residual document on the document table 1. When the discharging operation of the remaining original document is completed, the clutch 42 is turned on, and the original document D conveyed to the aligning roller 6 is sent to the conveying belt 12.

The original D passes through the size sensor 9 for detecting the width in the direction perpendicular to the original conveying direction, and when the rear end of the original D passes through the registration sensor 8, SIZE0 to SIZE3.
The signal is set and the DF-ACT signal is turned off. Further, from this point of time, by counting the pulses from the first pulse generator 44, the amount of conveyance of the document D is counted. When the amount of paper conveyed to the place where the rear end of the document D exceeds the left end of the document stopper 60 by a predetermined amount is counted, the carry motor 141 is stopped, and after a certain period of time, the carry motor 141 is rotated in the reverse direction so that the document D is read. The conveyance operation of the first document D is abutted against the left end of the document stopper 21 (FIG. 9).
(See C and D). The ORG-STP signal is output to the main processor a fixed time before the end of the transport operation. this is,
The original scanning system (not shown) of the copying machine starts the activation by the output of the ORG-STP signal, while the original scanning system shortens the time from the activation start point to the original scanning point. Is done for.

When the conveyance of the first document D is completed, the document D is read by the document scanning system of the electronic copying machine as described above. During this period, the document feeder carries out a first-out feeding operation to feed the second document D to the aligning roller 6 by the same control as the first document feeding operation, and the second document D is exposed to the exposure position. It is made to stand by at the first-out position closer to (see FIG. 9E).

When the reading of the first document D is completed,
The ORG-IN signal is output from the main processor 121 to the ADF processor 122. ADF processor 12
When receiving the ORG-IN signal, 2 starts the transport operation of the second document D from the preceding position. At this time,
When the first document D has a size shorter than a predetermined length in the transport direction, the step transport operation is performed (see FIG. 10F). In this specification, the step-carrying operation refers to the document D that has been conveyed to the exposure position when the document D that has been conveyed to the exposure position is replaced with the next document D.
Does not discharge the paper to the paper discharge tray 18, but conveys the paper to the step position (intermediate position) where the leading end reaches the paper discharge sensor 15 between the exposure position and the paper discharge tray 18 and stands by. . If you don't consider the appearance,
It can be carried out regardless of the size of the original. By performing this step-conveying operation, the document D that is conveyed to the exposure position next comes to the step position before the document D at the exposure position reaches the position where it can be ejected to the ejection tray 18. Since the conveyance can be started, the document exchange time is shortened.

The trailing edge of the second document D is the document stopper 60.
When the amount of paper conveyed up to the left end of the predetermined amount is counted, as in the case of FIG. 9D, the carry motor 141 is stopped, and after a certain time, the carry motor 141 is rotated in the reverse direction to copy the document D. The conveyance operation of the first document D is abutted against the left end of the stopper 21 (see FIG. 10G). Then, the third document D is conveyed to the advance position (see FIG. 10H).

When the reading of the second document D is completed,
As in the case of FIG. 10F, the transport operation of the third document D from the preceding position starts. At this time, when the size of the second document D is shorter than the predetermined length, the step conveyance operation is performed. At this time, the operation of discharging the exposed document D from the step position to the discharge tray 18 is simultaneously performed for the first document. (See Figure 10I). After that, the document conveying process of FIGS. 9D to 10I is sequentially repeated.

Next, with respect to the conveyance direction, the first document D is
When the size is longer than the predetermined length, the document is conveyed in the steps shown in FIGS. That is, the step conveyance operation is not performed, and the clutch 42 is turned on and the aligning roller 6 is driven at the time when the document D at the exposure position reaches the position where the document D can be discharged to the discharge tray 18. Document D that was waiting at (Fig. 11B
(Refer to FIG. 11C and FIG. 12D). Thereafter, when step conveyance is not involved, the conveyance of a plurality of originals is performed by repeating FIGS. 12E to 12F.

In the operation shown in FIGS. 11 and 12, in which the step-conveying operation is not performed, the exposed document D is discharged from the discharge tray 18 in the document replacing operation after the second document D is conveyed to the exposure position. At the same time, the operation of ejecting to (see FIG. 12F).

From the size position of the document D at the step position or the exposure position to the paper discharge roller 17 in the discharge operation (including both the case where the step operation is involved and the case where the step operation is not involved) at the time of the above-mentioned document exchange. Or a distance determined by the distance from the exposure position to the paper discharge roller 17 (the leading edge of the discharged document D is a fixed distance, the paper discharge tray 18
When the paper is conveyed to the distance (discharged to), the conveyance motor 141
Is controlled so that the speed of conveyance of the discharged document D is reduced and the discharged document D is aligned on the discharge tray 18.

When such a document exchange operation is performed for a series of documents D and the documents D on the paper feed tray 2 are exhausted, the empty sensor 7 is turned off and the ADF processor 122 turns off the ORD-RDY signal. Main processor 12
1 receives ORG-RDY signal OFF, ORG-
The OUT signal is output, and the document D being conveyed is discharged onto the discharge tray 18. ADF processor 122 is OR
When the G-OUT signal is received, if the originals are exchanged in the step conveyance operation, the two originals D, the original at the step position and the final original at the exposure position, are ejected. The control of this paper discharge operation is performed as follows (FIG. 8).
reference). First, a distance determined by the size of the document D at the exposure position and the step position and the distance from the step position to the paper discharge roller 17 (until the leading edge of the document D at the step position passes the paper discharge roller 17 for a certain distance. When the paper is conveyed up to the distance (1), the rotation speed of the conveyance motor 141 is decreased and the conveyance speed of the document starts to be reduced. The document D at the step position and the exposure position is ejected so as to be aligned on the paper ejection tray 18 at the decelerated conveyance speed. That is, the transport speed of the final document is reduced at the same time as the document at the step position. In other words, documents other than the last document were decelerated after being conveyed by a certain amount from the step position, but unlike the document transport up to that point for the last document, the transport speed is synchronized with the transport speed of the previous document. And slowing down.

Then, a certain time after the trailing edge of the document D at the exposure position passes through the ejection sensor 15, the conveyance motor 141
To stop. Next, the document discharge operation by the ORG-OUT signal when the documents are not exchanged in the step transport operation is an operation of transporting one document D at the exposure position to the discharge tray 18, and is not the step transport operation. The same control as the document discharge operation at the time of document replacement is performed. This completes the operation during single-sided document transportation. Next, with reference to FIG. 13 and FIG. 14, an operation at the time of conveying a double-sided original will be described.

The operation until the first original D is conveyed to the aligning roller 6 is the same as that for single-sided original conveyance (see FIGS. 13A and 13B). When the leading edge of the document D is stopped by the aligning roller 6, the transport motor 41 is rotated in the forward direction to rotate the transport belt 12, the reverse roller group 14 and the discharge roller 17 in the discharge direction to perform the document discharge operation. This also takes into consideration the case where a residual document exists on the document table 1. When the discharging operation of the remaining original document is completed, the clutch 142 is turned on, and the original document D conveyed to the aligning roller 6 is sent to the conveyance belt 12 (see FIG. 13C).

The document D passes through a size sensor 9 for detecting the width in the direction perpendicular to the document transport direction, and the document D
When the trailing edge of the trailing edge passes the registration sensor 8, SIZE0-
Set 3 signals. The trailing edge of the document D is the registration sensor 8
After passing a certain time, the clutch 142 is turned off, the flapper solenoid 143 is turned on, and the flapper 16 is set in the direction for reversing the document D. The document D is transported on the document mounting table 1 by the transport belt 12, and a predetermined time after the leading edge of the document D passes the ejection sensor 15,
(At this time, the leading edge of the document D has reached between the reversing discharge portion and the belt roller 11 on the paper discharge side.) The conveyance motor 141 is stopped, and the rotation direction of the conveyance motor 141 is reversed (FIG. 1).
See 3D). After a lapse of a fixed time after the conveyance motor 141 is stopped, the conveyance motor 141 starts rotating in the reverse direction, and the document D is conveyed toward the document stopper 160. The ADF processor 122 turns off the DF-ACT signal a certain time before the trailing edge of the document D reaches the document stopper 160, and when the leading edge of the document D reaches the document stopper 160, ORG-STP.
The signal is set and the carry motor 141 is stopped. The conveyance amount of the document D at this time is determined by counting the pulses output from the first pulse generator 144 after the leading edge of the document D has passed the ejection sensor 15 (see FIG. 13E).

When the ORG-STP signal is output, the electronic copying machine starts the operation of reading the original by the scanning system. When the reading operation is completed, the main processor 121 outputs the ORG-IN signal to invert the document D. A
When the DF processor 122 receives the ORG-IN signal, it rotates the carry motor 41 in the forward direction to start carrying the document D at the exposure position in the direction of the reverse discharge unit, and then reverses the document D at the reverse discharge unit. , The inverted document D is conveyed to the exposure position (see FIGS. 14F and 14G). This inverted document D
When the first document feed operation of the second document D is performed while the reading is performed, and the next ORG-IN signal is output from the main processor 121, the document transport device replaces the document ( 14H, I).

Next, when a document feeding error occurs in the document D between the empty sensor 7 and the registration sensor 8, the ADF
A jam signal (DF-JAM) and an error code signal (ERR) from the processor 122 to the main processor 121.
-COD) is sent, and the jam occurrence location is displayed on the display panel 202 of the operation panel 200 shown in FIG. When the original document causing the jam is taken out, the registration sensor 8 is turned off. When the original is set again on the paper feed tray 2, the empty sensor 7 is turned off. Then, the ADF processor 122 receives these signals and sends an original set signal (ORG-RDY) to the main processor 121. The main processor 121 receives the signal and clears the jam. In this case, the jam is released without opening or closing the jam access cover or the transport section.

[0043]

As described above, according to the present invention, the jam is released in the state where there is no original document in the original document transport section and the original document is re-stacked in the original document supply section. The jam can be removed and the workability can be improved by simply removing it and setting it again in the document supply section.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a document feeder.

FIG. 2 is a schematic configuration diagram of an electronic copying machine equipped with a document feeder.

FIG. 3 is a block diagram showing an overall control system of an electronic copying machine and a document feeder.

FIG. 4 is a flowchart for explaining a paper feeding operation control.

FIG. 5 is a flowchart for explaining a first-out operation and a paper feeding operation.

FIG. 6 is a flowchart for explaining a paper discharge operation and a first paper discharge operation.

FIG. 7 is a flowchart for explaining a transport operation.

FIG. 8 is a flowchart for explaining a forced paper ejection operation.

FIG. 9 is an explanatory view sequentially showing document transportation (steps A to E) when stepwise transporting a single-sided document.

FIG. 10 is an explanatory view sequentially showing document transportation (steps F to I) when stepwise transporting a single-sided document.

FIG. 11 is an explanatory diagram sequentially showing the document transportation (steps A to C) when the one-sided document is transported and the step transport is not performed.

FIG. 12 is an explanatory view sequentially showing the document transportation (steps D to F) when the one-sided document is transported and step transportation is not performed.

FIG. 13 is a document conveyance when a two-sided document is conveyed (steps A to E)
Explanatory diagram showing sequentially

FIG. 14 is a document conveyance when a two-sided document is conveyed (steps F to I)
Explanatory diagram showing sequentially

FIG. 15 is an explanatory diagram of an operation panel

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Document placing table, 2 ... Paper feeding tray, 3 ... Pickup roller, 4 ... Sakiki roller, 5 ... Sakiki pad, 6 ... Aligning roller pair, 7 ... Empty sensor, 8 ... Registration sensor, 9 ... Size sensor, 10 ... Belt Roller, 1
1 ... Belt roller, 12 ... Conveying belt, 13 ... Belt pressing roller, 14 ... Inversion roller group, 15 ... Discharge sensor, 1
6 ... Flapper, 17 ... Ejection roller, 18 ... Ejection tray, 19 ... ADF open sensor, 20 ... Cover open sensor, 21 ... Original stopper, 121 ... Main processor, 122 ... ADF processor, 123 ... Input interface, 124 ... Input switch, 125 ... Various detectors, 126 ... Display unit, 127 ... Driver, 128 ... Lamp control unit, 129 ... Various drive systems, 130 ... Driver,
131 ... Various chargers, 132 ... High-voltage power supply section, 140 ... Paper feeding motor, 141 ... Conveying motor, 142 ... Clutch, 1
43 ... flapper solenoid, 144 ... first pulse generator, 145 ... second pulse generator, 150-153 ... driver, 200 ... operation panel, 201 ... switch and LED for determining various paper sizes, 202 ... display panel, 203 ... Interrupt key, 204 ... Display panel, 205
… Numpad, 206… Switch, 207… Switch, 2
08: switch for determining various document sizes and display L
ED

Claims (1)

[Claims] 1. A document feeding unit for feeding a document from a document feeding unit to an image forming position, a unit for detecting a feeding error in the document feeding unit, and a feeding error detection signal from the feeding error detection unit. A means for issuing a jam occurrence signal based on this, a means for detecting the presence / absence of a document in the document feeder, a means for detecting that the document has been reloaded in the document feeder, and the absence of a document in the document feeder. An automatic document feeder including: a means for issuing a jam clearance signal based on the detected detection signal and the detection signal for detecting that the document has been reloaded on the document supply section.