JP3998520B2 - Document feeder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper feeding device that feeds out originals stacked on a loading tray one by one, and in particular, to bring out feeding means for feeding the placed originals and presses the originals on the loading tray against the feeding means. The present invention relates to a paper feeding device having a support means that can be raised and lowered.
[0002]
[Prior art]
In a paper feeder provided in an image forming apparatus such as a copying machine, a facsimile machine, or a printer, the original sheets stacked on the loading tray are separated into one sheet and sequentially supplied to the original reading unit provided on the downstream side. A separation mechanism for feeding paper and a feeding mechanism are provided.
[0003]
Separately from the placement tray that feeds the document from the placement tray, a support tray that can be moved up and down to support a part of the document loaded on the placement tray is provided at a position facing the feeding roller, and the support tray is raised to the top. 2. Description of the Related Art There is known a paper feeding device that feeds a document by bringing an upper document surface into contact with a feeding roller. Such a sheet feeding device having a support tray that can be moved up and down can feed out a large number of document sheets stacked on the loading tray.
[0004]
[Problems to be solved by the invention]
However, in such a conventional paper feeding device, when the leading edge of the document placed on the placement tray is curled downward (the placement tray surface side) or bent downward, the document is removed. The leading edge of the document is caught on the guide surface of the guide guide that guides downstream in the sheet feeding direction, causing problems that the document cannot be fed out or that the document jams in the sheet feeding path.
[0005]
The present invention has been made in view of the above-described problems of conventional apparatuses, and can place a document on a loading tray even if it is a document whose leading end is curled downward or bent downward. It is an object of the present invention to provide a paper feeding device that can reliably feed out the originals one by one.
[0006]
[Means for Solving the Problems]
For this reason, the present invention provides a placement tray for placing a document, a support tray for supporting the leading end portion of the document placed on the placement tray, and a top of the document loaded on the placement tray. A feeding unit that feeds the document in contact with the upper surface ; a support member that swingably supports the feeding unit; and a lifting unit that lifts the support tray to move the uppermost surface of the document to a feeding position by the feeding unit. Detecting means for detecting non-feeding of the document by the feeding means, and the lifting means so as to move the uppermost surface of the document to a raised position that is raised by a predetermined amount from the feeding position according to the detection result of the detecting means. and control means for controlling, by said lifting means in contact with said support member at a position which is raised to the uppermost surface of the document in the raised position, to impart a pressing force for pressing the top surface of the document in the feeding means There is provided a document feeding apparatus characterized by comprising a pressing means.
[0007]
Here, the pressing means is formed by a biasing spring member that contacts the support member and biases the feeding means to the uppermost surface of the document .
[0008]
This makes it possible to raise the lifting tray by a predetermined amount from the feeding position, press the curled document and correct the curl, and eliminate the situation where the leading end of the document is caught by the feeding guide and is not fed. . Furthermore, since the pressing means is an urging spring member and has a simple structure, this can be realized at low cost.
[0009]
By the way, the detection of the document non-feed by the detection means is performed by a document detection sensor arranged at a predetermined position downstream of the feeding means in the document feeding direction within a predetermined time after starting the document driving by the feeding means. This is done when it is not detected .
[0010]
The present invention further includes a placement tray for placing a document, a support tray for supporting a front end portion of the document placed on the placement tray, and an uppermost surface of the document loaded on the placement tray. A feeding unit that feeds the document in contact with it, a support member that swingably supports the feeding unit, and an elevating unit that raises the support tray to move the uppermost surface of the document to a feeding position by the feeding unit; A detection means for detecting a non-feed of the document by the feeding means; and a detection result of the detection means to move the uppermost surface of the document to a raised position that is a predetermined amount higher than the feeding position, so that the uppermost surface of the document is After moving to the lift position, the control means for controlling the lifting means so that the top surface of the document is lowered again to the feeding position, and the top surface of the document is lifted to the lift position by the lift means. A document feeder comprising: a pressing unit that contacts the support member at the position and applies a pressing force that presses the uppermost surface of the document to the feeding unit. There is .
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a document feeder according to the present invention will be described below in detail with reference to the drawings.
[0015]
FIG. 1 shows the overall configuration of a document feeder of the present invention mounted on an image reading apparatus. FIG. 2 is a side view of the main part of the document feeding mechanism in the document feeding apparatus.
[0016]
In FIG. 1, the document feeder A is mounted on the image reading apparatus main body H, and the document feeder A conveys the document so as to pass through the upper surface of the contact glass 1 a of the main body H.
[0017]
The apparatus main body H irradiates the conveyed original with light from the light source 2 such as a lamp through the first contact glass 1 a, reflects the reflected light on the mirror 3, and reads a CCD or the like through the lens 4. Means 5 performs photoelectric conversion to read the original image. Accordingly, the reading unit of the apparatus main body H is disposed on the upper surface of the first contact glass 1a.
[0018]
The image reading apparatus main body H is also provided with a second contact glass 1b having an area on which a document can be placed, such as a book placed on the contact glass 1b by opening and closing the document feeder A. By moving a light source unit including a light source 2 and a mirror 3 in the sub-scanning direction for a thick original, an image of the original can be read through the second contact glass 1b.
[0019]
Next, the configuration of the document feeder A will be described with reference to FIGS.
[0020]
The document feeder A includes a placement tray 10 on which a plurality of documents can be placed, a support tray 22 that places a plurality of documents and moves up and down to a feeding position, and storage means for storing the read documents. A first paper discharge tray 18 and a second paper discharge tray 19 are provided. The first paper discharge tray 18 mainly stores large-size documents, and the second paper discharge tray 19 Store small documents.
[0021]
The document feeder A also feeds a document on the loading tray 10 one by one toward the first contact glass 1a, and a document feed path 11 formed continuously to the sheet feed path 11. The conveyance path 12 guides along the upper surface of the first contact glass 1 a, and the first discharge path 13 connected from the conveyance path 12 to the discharge outlet of the first discharge tray 18.
[0022]
Further, a circulation path 14 that is connected to a connection portion between the paper feed path 11 and the transport path 12 from the paper discharge port of the first paper discharge tray 18 and returns the document to the transport path 12 again, and a first paper discharge path. 13, an intermediate path 15 that guides the original from the conveyance path 12 and a second discharge path 16 that extends from the intermediate path 15 to the discharge port of the second discharge tray 19 are provided. In addition, a switchback path 17a that is branched from the second paper discharge path 16 to switch back a document from the intermediate path 15, and a second paper discharged by turning the switched back document upside down. A document path comprising a reversing path 17b leading to the paper discharge port of the tray 19 is formed.
[0023]
The side of the original placed on the placement tray 10 is regulated by the side guide 20, and the leading end is regulated by the guide guide 21. Further, the loading tray 10 is rotatably attached with the leading end side in the document feeding direction as a fulcrum.
[0024]
FIG. 3 is a perspective view of a configuration example of a control mechanism that controls the raising and lowering of the support tray 22 in the document feeding portion of the apparatus. FIG. 3A is a perspective view of the control mechanism as seen from above, and FIG. 3B is a perspective view of a configuration example of the control mechanism shown in FIG. 3A as seen from the back side.
[0025]
The drive mechanism of the support tray 22 in the present embodiment includes a support tray 22 that moves up and down with a document placed thereon, a rotation fulcrum 53 that is attached to a side plate of the apparatus A for the support tray 22 to rotate up and down, An elevating lever 49 that abuts the lower surface of the supporting tray 22 in the document conveying direction and raises and lowers the supporting tray 22, a rotating shaft 51 that is connected to the elevating lever 49 and rotates the elevating lever 49, and is connected to the rotating shaft 51. It comprises a plurality of gears 52a, 52b, 52c and a lifting motor M4 that can rotate forward and reverse to rotate the gear gears 52a, 52b, 52c. Further, the support tray 22 on which the document is placed is raised to bring the upper surface of the document into contact with the document, and a feeding roller 23 for feeding the contacted document, an upper limit sensor lever 47 connected to the bracket of the feeding roller 23, and an upper limit. The upper limit sensor S9 has a concave shape with which the sensor lever 47 is fitted. The upper limit sensor 59 is a transmission type sensor having a light emitting part and a light receiving part, and an upper limit sensor lever 47 provided on the bracket of the feeding roller 23 blocks and transmits light from the light emitting part to the light receiving part. Detect the position of the top surface.
[0026]
As a means constituting the paper feeding device, the support tray 22 that raises the leading edge of the placed document to come into contact with the feed roller 23, the lift lever 49 that lifts and lowers the support tray 22, and the feed roller 23 move up and down together. Only the leaf spring 44 that presses the lift sensor lever 47 downward, the upper limit sensor S9 that detects the position of the support tray 22, the paper feeding roller 24 that feeds the document fed by the feeding roller 23, and only one of the uppermost document. Separating means comprising a separating member 25 for blocking the feeding of the second and subsequent originals after passing, and the leading edge of the original separated and fed by the separating means is abutted and aligned downstream. A registration roller pair 26 is provided. Here, the raising / lowering of the support tray 22 is driven by the raising / lowering motor M4 (refer FIG. 3).
[0027]
The feeding roller 23 and the paper feed roller 24 are driven through a one-way clutch OW1 coupled to the paper feed motor M1, and the registration roller pair 26 is drivingly coupled to the paper feed motor M1 through a one-way clutch OW2. ing. Accordingly, the feeding roller 23 and the paper feed roller 24 are driven by the normal rotation of the paper feed motor M1, and the registration roller pair 26 is driven by the reverse rotation.
[0028]
In the conveyance path 12, a large-diameter conveyance roller 27 and a plurality of driven rollers 28, 29, and 30 that are in pressure contact with the peripheral surface of the conveyance roller 27 are disposed. The conveyance roller 27 is driven by a conveyance motor M2. It is configured as follows.
[0029]
The first paper discharge path 13 includes a driven roller 31 pressed against the conveying roller 27, a first paper discharge roller pair 32 for discharging the original to the first paper discharge tray 18, and a flapper driven by a pressure contact solenoid SOL2. 40 is arranged. The first paper discharge roller pair 32 is connected to a first paper discharge motor M3 capable of forward and reverse rotation, and reversely rotates with the rear end side of the original being nipped in the duplex mode to switch the original. It is controlled to send back to the conveyance path 12 via the circulation path 14. Further, the discharge roller pair 32 separates the other roller 32a from the one roller 32b by the press contact solenoid SOL1 so that the document can be conveyed without trouble when the leading and trailing ends of the document circulated through the circulation path 14 and the conveyance path 12 pass each other. Is configured to do.
[0030]
Further, an intermediate roller pair 33 for sending the document downstream is disposed in the intermediate path 15, and a second discharge roller pair 35 for discharging the document to the second discharge tray 19 in the second discharge path 16. Is arranged. Also, a switchback roller pair 34 is disposed on the switchback path 17a, and the document is switched back and sent to the second paper discharge roller pair 35 via the reverse path 17b.
[0031]
Further, an empty sensor S1 for detecting that a document is placed on the placement tray 10 is provided downstream of the placement tray 10 in the document feeding direction. A length sensor S2 for detecting the end portion and a registration sensor S3 are provided. Further, a lead sensor S4 is provided in front of the first contact glass 1a, a first discharge sensor S5 is provided at the discharge outlet of the first discharge tray 18, and an intermediate sensor S6 is provided at the intermediate path 15 (not shown). A second paper discharge sensor S7 (not shown) is provided in the vicinity of the paper discharge outlet of the second paper discharge tray 19, a switchback sensor S8 (not shown) is provided in the switchback path 17a, and the support tray 22 described above. The upper limit sensors S9 for detecting the position of the document are provided, and these sensors detect the edge of the document to be sent.
[0032]
Each of the sensors S1 to S9 is connected to a control unit including a CPU for controlling the conveyance of the document, and the motors M1, M2, M3, M4 and the above-described motors based on output signals from the sensors. The solenoids SOL1 and SOL2 are controlled to execute a document feeding operation.
[0033]
Next, the document feeding operation of the document feeder A having the above configuration will be described.
[0034]
An example of the single-side mode for reading one side of a document will be described. When the document is placed on the placement tray 10, it is detected by the empty sensor S1. As shown in FIG. 4, the elevating motor M <b> 4 that raises the elevating lever 49 starts to drive after a predetermined time with the support tray 22 in the lower limit position. The elevating lever 49 connected to the rotating shaft of the elevating motor M4 pushes up the lower surface of the support tray 22, and the support tray rotates and rises.
[0035]
The support tray 22 is raised until the upper limit sensor S9 is turned “ON”, whereby it is detected that the uppermost surface of the document has reached the feeding position, and the lifting motor M4 is stopped. As a result, as shown in FIG. 5, the document on the loading tray 10 is placed in a waiting state for feeding. Thereafter, when a paper feed command is received from the apparatus main body H, the paper feed motor M1 is rotated forward to feed the original.
[0036]
At this time, the feeding roller 23 and the paper feeding roller 24 are rotated in the document feeding direction, but the registration roller pair 26 is not rotated by the action of the one-way clutch OW2. When the leading edge of the document fed by the registration sensor S3 is detected, the document is temporarily stopped after being transported by a preset distance after the detection. At this time, the leading edge of the document is abutted against the nip portion of the registration roller pair 26 to form a deflection, whereby the leading edge of the document is aligned and the skew is removed. Thereafter, the paper feed motor M1 is driven in reverse, and the original is fed from the paper feed path 11 to the transport path 12.
[0037]
The transport motor M2 is driven simultaneously with the reverse rotation driving of the paper feed motor M1, and thereby the original transported through the paper feed path 11 is transported along the transport roller 27. When the leading edge of the document transported along the transport path 12 is detected by the read sensor S4, a predetermined amount is transported thereafter, and the paper feed motor M1 and the transport motor M2 are stopped. At this time, the document stops at a position in front of the first contact glass 1a. When the reading conveyance signal is received from the apparatus main body H, the conveyance motor M2 is re-driven to pass the document on the first contact glass 1a. At this time, the surface of the original is read by the reading means.
[0038]
In the process of transporting the document to the first contact glass 1a, after the leading edge of the transported document is detected by the lead sensor S4 and transported by a predetermined amount, the paper feed motor M1 and the transport motor M2 are stopped. When the leading edge of the document reaches a position in front of the first contact glass 1a, the subsequent document feeding operation is selected and discharged by the output signal of the length sensor S2.
[0039]
When the output signal of the length sensor S2 is ON, that is, when the sheet is at the position of the length sensor S2, the sheet is recognized as a long size (a sheet longer than a predetermined length), and the sheet is discharged onto the first discharge tray 18. To be controlled. That is, when the sheet is recognized as having a long size, the solenoid SOL2 is energized to move to a position where the flapper 40 is guided to the first paper discharge tray 18, and the first paper discharge motor M3 is driven in the forward rotation direction. Then, the first paper discharge roller pair 32 is rotated in the forward direction. As a result, the sheet that has passed through the first contact glass 1 a by the conveying roller 27 is discharged along the first discharge path 13 to the first discharge tray 18. Then, when a predetermined time elapses after the trailing edge of the sheet is detected by the first sheet discharge sensor S5, it is recognized that the sheet is completely discharged onto the first sheet discharge tray 18.
[0040]
When the output signal of the length sensor S2 is OFF, that is, when the sheet is not at the position of the length sensor S2, the sheet is recognized as a short size (a sheet shorter than a predetermined length), and the flapper 40 is maintained at the normal position. The sheet discharge motor M3 is driven in the forward direction to rotate the intermediate roller 33.
[0041]
As a result, the sheet that has passed through the first contact glass 1 a is guided to the intermediate path 15, and the second discharge tray is passed through the second discharge path 16 by the intermediate roller 33 and the second discharge roller 35. 19 is discharged.
[0042]
At this time, when the leading edge of the sheet conveyed through the intermediate path 15 is detected by an intermediate sensor (not shown), a second paper discharge motor (not shown) is driven to rotate forward, and the second paper discharge roller pair 35 is controlled to rotate. Then, when a predetermined time elapses after the trailing edge of the sheet is detected by a second discharge sensor (not shown), it is recognized that the document is completely discharged to the second discharge tray 19. In the single-side mode operation, when the registration sensor S3 detects the trailing edge of the sheet while the sheet is being conveyed on the conveyance path 12, the presence or absence of the sheet on the loading tray 10 is confirmed, and the next sheet is detected. In some cases, it is controlled to start the feeding operation of the next sheet in the same manner as the previous sheet.
[0043]
Next, an operation of feeding a document by raising the support tray 22 by a predetermined amount from the feeding position when non-feed of the document is detected in the present invention will be described.
[0044]
FIG. 6 is a flowchart for explaining detection of non-feed (unfeed) of a document. The non-feed detection will be described with reference to the flowchart of FIG.
[0045]
When the feeding roller 23 and the sheet feeding roller 24 are driven based on a sheet feeding command from the main body and the sheet feeding operation is started, a timer is set (ST1, ST2), and the feeding is performed until the timer is counted up. It is monitored whether or not the registration sensor S3 on the downstream side of the paper roller 24 is turned on (ST3).
[0046]
Here, in this embodiment, the timer measures a predetermined time by counting the driving pulses of the paper feed motor M1, and the predetermined time is the leading edge position of the document on the loading tray 10. Is the number of pulses obtained by adding a predetermined number of pulses to the number of pulses reaching the registration sensor S3.
[0047]
If the registration sensor S3 detects a document before the timer counts up, it is determined that the document is normally fed and the refeed flag is reset (ST4) and subsequent feeds. Perform the action.
[0048]
If the registration sensor S3 does not detect a document until the timer counts up (ST5), it is determined that the document is not fed, and the paper feed motor M1 is stopped (ST6). As a result, the feeding roller 23 and the paper feed roller 24 are stopped, so that even if the original is jammed, damage to the original can be minimized.
[0049]
Thereafter, the paper re-feeding process is executed (ST7). This refeed process will be described based on the flowchart of the refeed process in FIG.
[0050]
In FIG. 7, in the re-feed process, it is determined whether or not the re-feed flag is reset (S10). The re-feed flag is a flag indicating whether or not the re-feed process is the first time, in other words, whether or not a non-feed state has occurred twice in succession.
[0051]
If the re-feed flag is in a reset state, the re-feed flag is set (S11), and the support tray 22 is raised by a predetermined amount, assuming that the first re-feed operation, that is, the first non-feed error. S12). When it is confirmed that the support tray 22 is raised by a predetermined amount (S13), the rise of the support tray 22 is stopped (S14). Then, after the predetermined amount is raised, the paper feeding operation is executed again (S15).
[0052]
If the refeed flag is set, a feed error signal is transmitted to the main body assuming that the non-feed state is not canceled even if the refeed operation is executed once (S16).
[0053]
As described above, in this embodiment, the paper refeeding operation is executed only once. However, the paper refeeding operation may be executed a predetermined number of times. In this case, the refeed flag of the present embodiment is used as a refeed counter, and a feed error signal is transmitted when the value counted by the refeed counter becomes equal to the preset number of times.
[0054]
Here, when the original is not fed, the operation of raising the support tray 22 by a predetermined amount and performing the refeeding operation is an example in which a downward curled original bundle is placed on the placement tray 10. This will be explained based on.
[0055]
FIG. 8 is a view showing a state in which a bundle of originals curled downward is placed on the placement tray 10.
[0056]
When a document bundle curled downward is placed on the placement tray 10, when the support tray 22 is raised, the uppermost surface of the document comes into contact with the feeding roller 23 and the feeding roller 23 is moved upward. When the upper limit sensor S9 detects this movement, the raising of the support tray 22 is stopped. At this time, as shown in FIG. 8A, the uppermost surface of the document is positioned at a predetermined feeding position, but the leading edge of the document may be regulated by the regulating portion 21a of the inclined guide guide 21.
[0057]
In the document in such a state, even if the feeding roller 23 is driven to rotate, the leading edge of the document is caught by the guide guide 21 and is prevented from being fed because the feeding is prevented.
[0058]
When the non-feed is detected by the detection result of the registration sensor S3 described above, the support tray 22 is raised by a predetermined amount. As a result, the leading edge of the document is also moved upward, so that the catch by the guide guide 21 is released.
[0059]
At this time, as the support tray 22 is raised by a predetermined amount, the raising sensor lever 47 supporting the feeding roller 23 moved upward comes into contact with the leaf spring 44. The leaf spring 44 acts to urge the feeding roller 23 downward, and the feeding roller 23 is urged downward to apply a pressing force to the uppermost surface of the document as shown in FIG. 8B. Then correct the curl of the document.
[0060]
Further, as shown in FIG. 8C, by raising the support tray 22, the leading edge of the document is moved to a position where it can be reliably fed without being caught by the guide guide. Further, since the urging force by the leaf spring 44 is also increased, the pressing force of the feeding roller 23 against the uppermost surface of the document is further increased, and the curl of the document can be completely removed.
[0061]
In the above-described embodiment, the support tray 22 is raised from the feeding position by a predetermined amount at the time of refeeding, and the document refeeding operation is executed at the raised position, but it is raised by a predetermined amount from the feeding position. After releasing the catch on the guide surface of the document, it may be lowered by a predetermined amount, and the support tray 22 is returned to the feeding position to perform the refeed operation. As a result, the paper feeding operation is executed under the same conditions as in normal paper feeding.
[0062]
Furthermore, after the support tray 22 is lowered by a predetermined amount from the feeding position and stopped at the time of refeeding, the feeding operation may be performed by raising the support tray 22 by a predetermined amount from the feeding position. In this apparatus, even if the document is corrected by moving the support tray 22 up and down, the document is corrected and an impact is applied, and the leading end of the document strongly catches the guide guide. Is possible.
[0063]
As described above in detail, the document feeder includes a placement tray on which a document is placed, a support tray that supports a front end portion of a document placed on the placement tray, and a placement tray. A swingable feeding means for feeding the document in contact with the top surface of the document stacked on the document; a lifting means for lifting the support tray to move the top surface of the document to a feeding position by the feeding means; Detection means for detecting non-feeding of the document by the feeding means, and control for controlling the elevating means to move the uppermost surface of the document to a raised position that is raised by a predetermined amount from the feeding position based on the detection result of the detecting means. Provided with means.
[0064]
As a result, even if the front end of the document is curled downward or bent, it is possible to reliably feed out the documents placed on the placement tray 10 one by one.
[Brief description of the drawings]
FIG. 1 shows an overall configuration of a document feeder of the present invention mounted on an image reading apparatus.
FIG. 2 is a side view of a main part of a document feeding mechanism in the document feeding apparatus.
FIG. 3 is a perspective view of a control mechanism that controls a support tray in a document feeding portion of the apparatus.
FIG. 4 shows a state in which the support tray in the document feeding portion of the apparatus is located at the lower limit position.
FIG. 5 shows a state where the support tray in the document feeding portion of the apparatus is located at the raised position.
FIG. 6 is a flowchart for explaining detection of document non-feed (unfeed).
FIG. 7 is a flowchart of document refeed processing.
FIG. 8 is a cross-sectional view of a document feeding portion on which a bundle of documents curled downward is placed on a placement tray.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Loading tray 22 Support tray 23 Feeding roller 24 Feed roller 44 Leaf springs 46, 53 Rotation fulcrum 47 Upper limit sensor lever 49 Lifting lever S1 Empty sensor S3 Registration sensor S9 Upper limit sensor M1 Feeding motor M4 Lifting motor

Claims (4)

A loading tray for placing documents;
A support tray that supports the front end of the document placed on the placing tray;
A feeding means for feeding the document in contact with the uppermost surface of the document loaded on the tray;
A support member for swingably supporting the feeding means;
Elevating means for raising the support tray to move the uppermost surface of the document to the feeding position by the feeding means;
Detecting means for detecting non-feeding of the document by the feeding means;
Control means for controlling the elevating means so as to move the uppermost surface of the document to a raised position raised by a predetermined amount from the feeding position according to a detection result of the detecting means;
A pressing unit that contacts the support member at a position where the uppermost surface of the document is raised to the raised position by the elevating unit and applies a pressing force to press the uppermost surface of the document to the feeding unit;
A document feeder characterized by comprising: 2. The document feeder according to claim 1 , wherein the pressing means is formed by a biasing spring member that abuts on the support member and biases the feeding means to the uppermost surface of the document. A loading tray for placing documents;
A support tray that supports the front end of the document placed on the placing tray;
A feeding means for feeding the document in contact with the uppermost surface of the document loaded on the tray;
A support member for swingably supporting the feeding means;
Elevating means for raising the support tray to move the uppermost surface of the document to the feeding position by the feeding means;
Detecting means for detecting non-feeding of the document by the feeding means;
The uppermost surface of the original is moved to the raised position that is raised by a predetermined amount from the feeding position according to the detection result of the detection means, and after the uppermost surface of the original is moved to the raised position, the uppermost surface of the original is again Control means for controlling the elevating means so as to be lowered to the feeding position ;
A pressing unit that contacts the support member at a position where the uppermost surface of the document is raised to the raised position by the elevating unit and applies a pressing force to press the uppermost surface of the document to the feeding unit;
Document feeding apparatus characterized by comprising a. The detection of the non-feeding of the original by the detecting means is detected by a document detecting sensor arranged at a predetermined position downstream of the feeding means in the document feeding direction within a predetermined time after starting of driving of the document by the feeding means. The document feeder according to claim 1 or 3 , wherein the document feeder is performed when the document is not received.

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