JP2934386B2 - Recirculating document feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circulating document feeder, and more particularly, to a document feeder having a document tray on which a plurality of documents are stacked, and sequentially loading a plurality of documents stacked on the document tray from below through a paper feed port. And then returns the document to the top of the document.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. Sho 59-114249 discloses a circulating document feeder in which a plurality of documents stacked on a document tray are carried in from a paper feed port from below and returned to the top of the documents. It has been disclosed. This circulation type document feeder has a waveform applying means for applying a waveform to a discharged document according to the thickness of the document sheet and the size of the document in the width direction. In addition, since the sheet corrugation applying means is movable, it is possible to maintain consistency of the discharged documents by performing corrugation correspondence of document discharge holding even for documents of various sizes.

[0003]

In the conventional circulating document feeder, the scanned document discharged from the document discharge port may enter the paper feed port to cause a jam or a double feed. A problem occurs that the discharged document jumps out of the document feeding hopper. The cause of these troubles is that the document is always discharged in a fixed direction even when the document is discharged in a certain direction even if the document loading direction is slightly different or the curling state of the leading edge of the document in the document transport direction is different. Especially,
The above-mentioned troubles frequently occur in a long-size original or a thin original having a large size in the original transport direction.
If the document exit is designed to always eject the document at an upward angle to prevent entry into the document feeder, the document will "fly" like a paper airplane and the document will be fed into the document feed hopper. It is easy to jump out of Also, if the original is designed to always be ejected downward to avoid the flight of the original, the ejected original will be output if the loading capacity of the original is small and the paper feed port is not covered by the loaded original. Can easily enter the paper feed port.

[0004] When determining the direction in which a document is discharged from the document discharge port, in a conventional model in which the discharge direction is fixed, the document is designed to be discharged at an upward angle.
The reason is that if the original enters the paper feed port and causes a jam, the copying operation stops at that point and the original is damaged, whereas if the original flies out and jumps out, the copy before it jumps out When the operation is completed and a plurality of copies are repeatedly copied, it is easy to know the missing of the original from the count number before and after the original jumps out, and even if the original jumps out, the copying operation is normally stopped halfway, so that This is because the user receives less damage when the document is ejected than when the jam occurs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is possible to prevent a discharged document from entering a paper feeding port to cause a jam or a double feed, and to prevent the document feeding. It is an object of the present invention to provide a circulating document feeder that can prevent the document from jumping out of a hopper.

[0006]

According to a first aspect of the present invention, there is provided a detecting means for detecting a stacking height of a document loaded on a document tray, and a detecting means for placing the document on an uppermost portion of the document loaded on the document tray. comprising a discharge path that can be discharged in an upward angle or downward angle to return, and a switching means for switching a discharge direction of the original of the discharge route based on a detection result of said detecting means, the original on the original tray Loading height of
Is smaller than the specified amount, the returned document is
The output path is switched to the output path, and the original
If the loading height of the manuscript is higher than the
The discharge path is switched to a discharge path that discharges at a downward angle .

According to a second aspect of the present invention, there is provided a detecting means for detecting a stacking height of a document stacked on a document tray, and vertically disposed for returning the document to an uppermost portion of the document stacked on the document tray. A plurality of output paths, and switching means for switching the output path of the document based on the detection result of the detection means , wherein the plurality of output paths have an upward angle and a downward angle.
The top of the originals stacked on the original tray at the right angle
The loading height of the document on the document tray
Is smaller than the specified amount, the returned document is
The output path is switched to the output path, and the original
If the loading height of the manuscript is higher than the
The discharge path is switched to a discharge path that discharges at a downward angle .

According to a third aspect of the present invention, the discharge ports of the plurality of discharge paths are provided at a position higher than a paper feed port.

According to a fourth aspect of the present invention, there is provided a detecting means for detecting a height of a document stacked on a document tray, a discharge path for returning the document to the top of the document stacked on the document tray, and a discharge path. A fixed rib provided at a paper discharge port of the path, a movable rib disposed at a position facing the fixed rib, the movable rib being movable in a document conveying direction, and moving the position of the movable rib based on a detection result of the detection means. And a drive unit for changing a document discharge direction.

According to a fifth aspect of the present invention, there is provided a detecting means for detecting a stacking height of a document stacked on a document tray, a discharge path for returning the document to the top of the document stacked on the document tray, and a discharge path. A first roller provided at a discharge port of the path, a second roller capable of changing a contact position between a first roller for nipping the first roller and the original and discharging the original, ; and a changing means for changing the contact position between the first roller of the second roller on the basis of the detection result of means, the document tray
When the stacking height of the upper document is less than
The second roller has a second roller so that the document is ejected at an upward angle.
Change the position of contact with the first roller
If the stacking height of the document is higher than the
The first roller of the second roller is discharged so as to be discharged at the angle of orientation.
The contact position with the roller is changed .

According to a sixth aspect of the present invention, there is provided a detecting means for detecting a stacking height of a document stacked on a document tray, a discharge path for returning the document to the uppermost portion of the document stacked on the document tray, and a discharge path. A second movable rib provided at a discharge port of the path, which can move in a direction perpendicular to a document discharge direction, and moves the position of the second movable rib based on a detection result of the detection means to discharge the document. Driving means for changing the direction ,
If the stacking height of the originals on the
The second movable reload so that the original is discharged at an upward angle.
Position of the original, and check that the
If the original is higher than the fixed amount, the returned document is
The position of the second movable rib is moved so as to be extended .

According to a seventh aspect of the present invention, there is provided a detecting means for detecting a height of a document stacked on a document tray, a discharge path for returning the document to an uppermost portion of the document stacked on the document tray, and a discharge path. A pair of discharge guide pairs provided on the path, which can rotate in a direction perpendicular to the document discharge direction, and a drive for changing the discharge direction of the document by rotating the discharge guide pair based on the detection result of the detection means. Means on the document tray
If the stacking height of the document is
Rotate the discharge guide pair so that the
If the loading height of the documents on the document tray is higher than the specified amount,
Make sure that the return document is ejected at a downward angle.
The id pair is rotated .

[0013]

According to the first aspect of the present invention, a plurality of originals are stacked on an original tray, and the plurality of originals stacked on the original tray are sequentially conveyed from a lower side through a paper feed port. means stacking height of the document stacked on the document tray is detected by, Ru is the discharge direction of the document based on the detection result is switching of the detecting means by the switching means.
That is, the stacking height of the documents on the document tray is less than a predetermined amount.
The returned document is ejected at an upward angle.
Switch to the exit path and load the originals on the original tray
When the document is higher than the predetermined amount, the returned document
The discharge path is switched to the discharge path. The processed document is discharged from the switched path. This allows
If the document feeder is not blocked by the stacked documents, the document will be ejected at an upward angle, and the ejected document may enter the document feeder and cause a jam or double feed. If the paper feed port is closed by the stacked originals, the originals are discharged at a downward angle, and can be prevented from jumping out of the original supply hopper.

In the circulating document feeder according to the second aspect, a plurality of documents are stacked on a document tray, and the plurality of documents stacked on the document tray are sequentially carried in from a paper feed port from below and detected. Means for detecting the height of the originals stacked on the original tray, and switching means for switching the discharge direction of the originals based on the detection result of the detecting means.
You. That is, the stacking height of the originals on the original tray is
The returned document is ejected at an upward angle in the following cases:
Stacking documents on the document tray.
If the height is higher than the specified amount, the returned document
The discharge path is switched to the discharge path at an angle. The processed document is discharged from the switched path. As a result, if the paper feed port is not blocked by the stacked documents, the document is discharged at an upward angle, and the discharged document enters the paper feed port, causing a jam or double feed. When the paper feed port is closed by the stacked originals, the originals are discharged at a downward angle, and can be prevented from jumping out of the original feeder hopper.

According to the third aspect of the present invention, the document is discharged from a discharge port provided at a position higher than the paper supply port. As a result, the ejected document does not enter the paper feed port to cause a jam or a double feed.

In the circulating document feeder according to the fourth aspect, a plurality of documents are stacked on a document tray, and the plurality of documents stacked on the document tray are sequentially carried in from a paper feed port from below and detected. The stacking height of the originals stacked on the original tray is detected by the unit, and the position of the movable rib is moved by the driving unit based on the detection result of the detection unit, and guided by the fixed rib and the movable rib in the discharge path. The processed document is discharged. As a result, if the paper feed port is not blocked by the stacked documents, the document is ejected at an upward angle, and the discharged document enters the paper feed port, causing a jam or double feed. When the paper feed port is closed by the stacked originals, the originals are discharged at a downward angle, and can be prevented from jumping out of the original feeder hopper.

In the circulating document feeder according to the fifth aspect, a plurality of documents are stacked on the document tray, and the plurality of documents stacked on the document tray are sequentially carried in from the lower side through a paper feed port. stacking height of the document stacked on the document tray is detected by means, the contact position between the first roller by moving the second roller Ru is changed by changing means based on a detection result of said detecting means . That is, on the document tray
Original returned when the stacking height of the original
Of the second roller so that the paper is discharged at an upward angle.
Change the contact position with the rollers of
If the stacking height is higher than the specified amount, the returned document
The first row of the second roller is ejected at an angle
Change the contact position with the la. The processed document is discharged while being held between the first roller and the second roller. As a result, if the paper feed port is not blocked by the stacked documents, the document is ejected at an upward angle, and the discharged document enters the paper feed port, causing a jam or double feed. When the paper feed port is closed by the stacked originals, the originals are discharged at a downward angle, and can be prevented from jumping out of the original feeder hopper.

In the circulating document feeder according to the sixth aspect, a plurality of documents are stacked on a document tray, and the plurality of documents stacked on the document tray are sequentially carried in from a paper feed port from below and detected. stacking height of the document stacked on the document tray is detected by means, the position of the second movable ribs Ru is moved in the direction perpendicular to the document discharge direction by the drive means based on a detection result of said detecting means. That is, the document tray
Returned when the stacking height of the original on B is less than the specified amount.
The second movable rib so that the document is discharged at an upward angle.
Move the position of the
Returned document is ejected at a downward angle if higher than
To move the second movable rib. The processed document is discharged by being guided by the second movable rib. As a result, if the paper feed port is not blocked by the stacked documents, the document is ejected at an upward angle, and the discharged document enters the paper feed port, causing a jam or double feed. When the paper feed port is closed by the stacked originals, the originals are discharged at a downward angle, and can be prevented from jumping out of the original feeder hopper.

In the circulating document feeder according to the present invention, a plurality of documents are stacked on a document tray, and the plurality of documents stacked on the document tray are sequentially carried in from a paper feed port from below and detected. stacking height of the document stacked on the document tray is detected by means, the discharge guide pairs by a drive means based on a detection result of said detecting means Ru is rotated in the direction perpendicular to the document ejection direction. That is, the original on the original tray
If the loading height of the original is less than the
Rotate the discharge guide pair so that it is discharged at the angle of orientation,
When the stacking height of documents on the document tray is higher than the specified amount
The returned document so that it is ejected at a downward angle.
The exit guide pair is rotated. The processed document is discharged by being guided by the discharge guide pair. As a result, if the paper feed port is not blocked by the stacked documents, the document is ejected at an upward angle, and the discharged document enters the paper feed port, causing a jam or double feed. The original is ejected at a downward angle if the paper feed slot is blocked by a stack of originals.
Jumping out of the document feeding hopper can be prevented.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a circulating document feeder according to the present invention will be described below with reference to the drawings. A case in which the circulating document feeder is used in a copying machine will be described.

As shown in FIG. 1, the circulating document feeder of this embodiment has a document feed hopper 2 as a document tray on which a plurality of documents are stacked on an apparatus main body 1.
The document feeding hopper 2 includes a detecting unit 3 for detecting a stacking height of the documents stacked on the document feeding hopper 2, a document detecting sensor 4 for detecting the presence or absence of a document, and a cycle for detecting a cycle of the document. A detection sensor 5 and a carry-in belt 7 driven by driving means (not shown) for carrying a document into the apparatus main body 1 from the paper feed port 6 are provided.
Is configured to carry in the original while sucking the original by the suction force of the suction fan 8. On the downstream side of the carry-in belt 7 in the document conveying direction, there is provided a paper-entry detection sensor 9 for detecting a document. A large paper feed roller 10 for paper is rotatably supported. A U-shaped guide plate 11 for guiding a document is provided outside the large paper feed roller 10. A separation air fan 12 for supplying air for separating the original is provided above the large paper feed roller 10.

On the downstream side of the large paper feed roller 10 in the document transport direction, a transport belt 13 for transporting the document is provided, and the document is scanned along the transport belt 13 by a copying apparatus (not shown). Transparent platen glass 14
Are arranged. Conveyor belt 13 and platen glass 1
4, a large discharge roller 15 that is driven by a driving unit (not shown) and sends a document to a discharge path.
Is rotatably supported, and a U-shaped guide plate 66 for guiding a document is provided outside the large discharge roller 15. Further, downstream of the large discharge roller 15 in the document conveying direction, a plurality of discharge paths 16, 1, 1, 2, and 3, which are arranged vertically to return the document to the uppermost portion of the document stacked on the document feed hopper 2.
7, a switching lever 18a for switching a document discharge path based on the detection result of the detection means 3, and a solenoid 1
8b, and 1 for the discharge paths 16 and 17.
A pair of paper discharge rollers 25 and 26 are provided. In addition,
The paper discharge ports 27 and 28 of the discharge paths 16 and 17 are located above the paper supply port 6.

As shown in detail in FIG. 2, the detecting means 3 includes a document loading amount detecting lever 20 rotatably supported by a support shaft 19, and one end fixed to the support shaft 19 and the other end mounted thereon. A detection lever return spring 21 which is a kick spring which abuts on the amount detection lever 20 and urges in the direction of arrow A, and a light transmission type original load amount detection sensor 22 which detects a base end portion of the original load amount detection lever 20. , A wire 23 connected to the detection lever return spring 21, and a solenoid 24 connected to the wire 23.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG.

When a document is placed on the document feed hopper 2, the solenoid 24 is turned off as shown in FIG.
The document loading amount detection lever 20 is urged in the direction of arrow A by the detection lever return spring 21 and is held at the standing position. In this state, when the user places a document on the document feed hopper 2 (step 1), the document detection sensor 4 detects that the document is placed on the document feed hopper 2. Then, when the user turns on the copy start key (step 2), the cycle detection lever 5 is operated, and the selection of the lever 5 is changed to the document feeding hopper 2
The uppermost document is brought into contact with the uppermost document (step 3). Then, the solenoid 24 is turned on (step 4), the detection lever return spring 21 is pulled up by the solenoid 24, and the original load amount detection lever 20 rotates in the direction of arrow B by its own weight, and is placed on the original feed hopper 2. The leading end of the document stacking amount detection lever 20 abuts on the scanned document (step 5). Then, the solid line (20a) in FIG.
As shown in (2), the optical axis of the transmissive original loading amount detection sensor 22 is shut off by the base end portion of the original loading amount detection lever 20, the original loading amount detection sensor 22 is turned on, and the original is 6 is determined to be lower than the height (Step 6). Then, the solenoid 18b is turned on (step 7), and the switching lever 18a is moved to the position shown by the broken line in FIG. 5 (step 8).

Then, the separation air fan 12 is started, and the blowing of the separation air is started (step 9). Further, the carry-in belt 7 and the suction fan 8 are activated, and the lowermost document among the stacked documents is attracted to the carry-in belt 7 by the suction force of the suction fan 8, and is moved to the paper feed port 6 by the carry-in belt 7. It is carried in (step 10).
Then, it is determined whether or not the first document is detected by the paper input detection sensor 9 (step 11). If the first document is detected, the solenoid 24 is turned off (step 12), and the urging force of the detection lever return spring 21 is used. The document stacking amount detection lever 20 is turned to the position shown in FIG. 4A and stands up (step 13). Then, the original is fed to the platen glass 14 by the large feed roller 11 and the transport belt 13.
The document is conveyed to an upper predetermined position, and the copying machine scans the copying process, that is, the image of the document (step 14). Then, it is determined whether or not the specified number of copies have been completed (step 15).
The document that has been scanned is conveyed to the large discharge roller 15 by the conveyance belt 13. Further, the original 100 is conveyed by the large discharge roller 15 to the switching lever 18a located at the position indicated by the broken line in FIG. 5, guided by the switching lever 18a to the discharge path 16, and discharged by the pair of discharge rollers to the discharge port 2.
7, the document placed on the document feed hopper 2 is discharged at an upper angle to the uppermost portion of the document.

In step 6 described above, if the original loading amount detection lever 20 is located at the position 20c in FIG. 4B and the optical axis of the transmission type original loading amount detection sensor 22 is not blocked by the base end portion, The document loading amount detection sensor 22 is turned off, and it is determined that the document is loaded to a position higher than the height of the paper feed port 6, and the solenoid 18b is turned off.
FF is performed, and the switching lever 18a is moved to the position shown by the solid line in FIG. Therefore, the discharged document is discharged at a downward angle through the lower discharge path 17.

If the first document is not detected by the paper detection sensor 9 in step 11 described above, a reset request lamp (not shown) is turned on to notify the user that a document loading error has occurred. Step 1
6) Return to step 2.

The above operation is performed for all originals, and one cycle is completed. When a plurality of cycles are set, the above-described operation for all originals is performed for a plurality of cycles. As described above, it is possible to prevent the discharged document from entering the paper feed port 6 to cause a jam or a double feed, and the like.
In addition, the document can be prevented from jumping out of the document feed hopper 2.

Next, the second embodiment of the circulating document feeder of the present invention will be described.
Will be described with reference to FIG. Since the basic configuration is the same as that of FIG. 1, the same components are denoted by the same reference numerals, and only the characteristic portions of this embodiment will be described.

The circulating document feeder according to the present embodiment has a discharge path 29 formed by a pair of guide plates 29a and 29b.
A fixing rib 31 is provided on the guide plate 29a adjacent to the paper discharge port 30. Also, the guide plate 29
b, a movable rib 32 is slidably supported. One end of the movable rib 32 is connected to a rib return spring 33 fixed to the apparatus main body 1, and a solenoid as a driving means is provided on the opposite side. 34.

Therefore, the detecting means 3 detects that the original is
, The solenoid 34 remains OFF, the movable rib 32 is located at the position indicated by the solid line, and the original is fixed to the fixed rib 31.
Along the direction of Qa. If the detecting means 3 determines that the paper is loaded only to a position lower than the height of the paper feed port 6, the solenoid 34 is turned on, the movable rib 32 moves to the position indicated by the broken line, and the document is resiliently attached. It is discharged in the direction of Qb.

Next, the third embodiment of the circulating document feeder of the present invention will be described.
Will be described with reference to FIG. Since the basic configuration is the same as that of FIG. 1, the same components are denoted by the same reference numerals, and only the characteristic portions of this embodiment will be described.

The circulating document feeder according to the present embodiment has a discharge path 29 composed of a pair of guide plates 29a and 29b.
A first roller 35, which is driven and rotated, is rotatably supported at the discharge port 30 of the discharge path 29.
An elongated hole 36 formed on a concentric circle centered on the axis of the first roller 35 is formed on a pair of frames not shown. The second roller, which can be brought into contact with the first roller 35 through a pair of elongated holes 36 formed in the pair of frames and can change the contact position with the first roller, is rotatable and elongated.
It is movably supported inside. Further, the second roller is urged rightward by a roller return spring 37, and one end of a rotatably supported lever 38 is in contact with the shaft of the second roller. The end is connected to a solenoid 39. Roller return spring 37
, The lever 38, and the solenoid 39 constitute a changing means for changing the contact position of the second roller with the first roller.

Therefore, the original is detected by the detecting means 3 in the paper feed port 6.
If it is determined that the stack is higher than the height, the solenoid 39 is turned on, and the second roller is moved by the lever 38 in the direction of arrow R to the position shown by the broken line in FIG.
The contact position between the first roller 35 and the second roller changes, and the document is sandwiched between the first roller 35 and the second roller and discharged in the Sa direction. If the detecting means 3 determines that the sheet is loaded only to a position lower than the height of the paper feed port 6, the solenoid 39 is turned off, the second roller 36 is moved to the solid line position, and the document is moved in the direction of Sb. Is discharged.

Next, the fourth embodiment of the circulating document feeder of the present invention will be described.
Will be described with reference to FIGS. 8 and 9. FIG. In addition,
Since the basic configuration is the same as that of FIG. 1, the same components are denoted by the same reference numerals, and only the characteristic portions of the present embodiment will be described.

The circulating document feeder according to the present embodiment has a discharge path 29 constituted by a pair of guide plates 29a and 29b.
And the second movable rib 4 adjacent to the discharge port 30
0 is supported rotatably in a direction perpendicular to the document discharge direction. One end of the movable rib 40 is connected to a rib return spring 41 fixed to the apparatus main body 1, and the other end is connected to a solenoid 42 as driving means.

Therefore, the detection means 3 detects that the original is
Is determined, the solenoid 42 is turned on, the movable rib 40 is moved to the position shown by the broken line, and the document is discharged in the direction of Ta.
When the detecting means 3 determines that the sheet is loaded only to a position lower than the height of the paper feed port 6, the solenoid 42 is turned off, and the movable rib 40 is moved to the solid line position by the urging force of the rib return spring 41. The original is discharged in the direction of Tb.

Next, the fifth embodiment of the circulating document feeder of the present invention will be described.
Will be described with reference to FIG. Since the basic configuration is the same as that of FIG. 1, the same components are denoted by the same reference numerals, and only the characteristic portions of this embodiment will be described.

The circulating document feeder according to the present embodiment has a discharge path 29 constituted by a pair of guide plates 29a and 29b.
And a pair of transport rollers 49 for nipping and transporting the document in the paper discharge path 29 are provided. The shafts 53 and 54 are provided at the ends of the guide plates 29a and 29b, respectively.
Are disposed substantially horizontally, and the respective shafts 53, 54
Guide plates 43 and 44 forming a pair of discharge guides.
Are rotatably supported. The guide plates 43 and 44 are connected by a connection plate 50, and are configured to rotate integrally. Further, the guide plate 43 has one end connected to a return spring 47 fixed to the apparatus main body 1.
The guide plate 44 is connected to a solenoid 52 as driving means for rotating the pair of discharge guides 43 and 44 based on the detection result of the detection means 3. Further, paper discharge rollers 45 and 46 are rotatably supported by the respective guide plates 43 and 44, and the shafts of the paper discharge rollers 45 and 46 are connected to a connecting plate 51.
Are connected by

Therefore, the original is detected by the detecting means 3 in the paper feed port 6.
If it is determined that the stack is higher than the height of the guide plate, the solenoid 52 is turned ON, and the guide plate pair 43, 44
Is moved to the position shown in FIG. 10B, and the document is nipped by the paper discharge rollers 45 and 46 and discharged in the Ua direction. When the detecting means 3 determines that the paper is loaded only to a position lower than the height of the paper feed port 6, the solenoid 5
2 is turned off, and the pair of guide plates 43 and 44 are shown in FIG.
, And the document is nipped by the paper discharge rollers 45 and 46 and discharged in the direction of Ub.

[0042]

According to the first aspect of the present invention, a plurality of originals are stacked on the original tray, and the plurality of originals stacked on the original tray are sequentially carried in from the paper feed port from below. The detecting unit detects the stacking height of the documents stacked on the document tray, and the switching unit switches the discharge direction of the document based on the detection result of the detecting unit . Loading height
The returned document is at an upward angle when
Is switched to the discharge path for
Documents that are returned when the stacking height of the documents is higher than the specified amount
Is switched to the discharge path for discharging the document at a downward angle, so that if the paper feed port is not blocked by the stacked documents, the document is discharged at an upward angle and is discharged. When the document does not enter the paper feed port and jams or double feed does not occur, and when the paper feed port is blocked by stacked documents, the document is discharged at a downward angle, Jumping out of the document feeding hopper can be prevented.

According to the circulating document feeder of the second aspect,
A plurality of originals are stacked on the original tray, and the plurality of originals stacked on the original tray are sequentially carried in from a paper feed port from below, and a detecting unit detects a stack height of the originals stacked on the original tray. The switching unit switches the discharge direction of the document based on the detection result of the detection unit, and discharges the processed document from the switched path . That is, the plurality of discharge paths have an upward angle.
And the original at a downward angle.
It is configured to return to the top.
When the loading height is less than the predetermined amount, the returned document
It is switched to the discharge path that discharges at an angle, and the document tray
Returned when the loading height of the upper document is higher than the specified amount
Switch to the output path where the original is output at a downward angle.
Since the, the document discharge direction is changed. As a result, if the paper feed port is not blocked by the stacked documents, the document is ejected at an upward angle, and the discharged document enters the paper feed port, causing a jam or double feed. When the paper feed port is closed by the stacked originals, the originals are discharged at a downward angle, and can be prevented from jumping out of the original feeder hopper.

According to the circulating document feeder of the third aspect,
Since the document is configured to be discharged from the discharge port provided at a position higher than the paper supply port, the discharged document does not enter the paper supply port to cause a jam or a double feed.

According to the circulating document feeder of the fourth aspect,
A plurality of originals are stacked on the original tray, and the plurality of originals stacked on the original tray are sequentially carried in from a paper feed port from below, and a detecting unit detects a stack height of the originals stacked on the original tray. The position of the movable rib is moved by the driving means based on the detection result of the detection means, and the scanned document is discharged by being guided by the fixed rib and the movable rib in the discharge path. Is changed. As a result, if the paper feed port is not blocked by the stacked documents, the document is ejected at an upward angle, and the discharged document enters the paper feed port, causing a jam or double feed. If the document feeder is not covered and the paper
The document is discharged at a downward angle, and can be prevented from jumping out of the document feeding hopper.

According to the circulating document feeder of claim 5,
A plurality of originals are stacked on the original tray, and the plurality of originals stacked on the original tray are sequentially carried in from a paper feed port from below, and a detecting unit detects a stack height of the originals stacked on the original tray. The second roller is moved by the changing means based on the detection result of the detecting means, the contact position with the first roller is changed, and the processing is completed by being held between the first roller and the second roller. The document was configured to be ejected ,
That is, the stacking height of the documents on the document tray is less than a predetermined amount.
The returned document is ejected at an upward angle.
The contact position of the second roller with the first roller
If the stacking height of the originals on the original tray is higher than
The returned document is ejected at a downward angle.
Changing the contact position of the second roller with the first roller changes the document discharge direction. As a result, if the paper feed port is not blocked by the stacked documents, the document is ejected at an upward angle, and the discharged document enters the paper feed port, causing a jam or double feed. When the paper feed port is closed by the stacked originals, the originals are discharged at a downward angle, and can be prevented from jumping out of the original feeder hopper.

According to the circulating document feeder of claim 6,
A plurality of originals are stacked on the original tray, and the plurality of originals stacked on the original tray are sequentially carried in from a paper feed port from below, and a detecting unit detects a stack height of the originals stacked on the original tray. The position of the second movable rib is moved in a direction perpendicular to the document discharge direction by the drive means based on the detection result of the detection means, and the processed document is discharged by being guided by the second movable rib. It was constructed in, Sunawa
When the stacking height of the documents on the document tray is less than the predetermined amount
The document so that the returned document is ejected at an upward angle.
Move the position of the movable rib 2 and stack the originals on the original tray.
When the loading height is higher than the specified amount, the returned document is
Move the position of the second movable rib so that it is ejected at an angle of
Since, the document discharge direction is changed. As a result, if the paper feed port is not blocked by the stacked documents, the document is discharged at an upward angle, and the discharged document enters the paper feed port, causing a jam or double feed. When the paper feed port is closed by the stacked originals, the originals are discharged at a downward angle, and can be prevented from jumping out of the original feeder hopper.

According to the circulating document feeder of claim 7,
A plurality of originals are stacked on the original tray, and the plurality of originals stacked on the original tray are sequentially carried in from a paper feed port from below, and a detecting unit detects a stacking height of the originals stacked on the original tray. the discharge guide pairs by a drive means based on a detection result of the detecting means is rotated in a direction perpendicular to the document discharge direction, being guided by the discharge guide pairs processed document and configured to be discharged, i.e. , Manuscript tray
Returned when the stacking height of the original on B is less than the specified amount.
Set the output guide pair so that the original is
Turns and the stacking height of the documents on the document tray is higher than a predetermined amount.
The returned document is ejected at a downward angle.
Since the discharge guide pair is rotated as described above , the document discharge direction is changed. As a result, if the paper feed port is not blocked by the stacked documents, the document is ejected at an upward angle, and the discharged document enters the paper feed port, causing a jam or double feed. When the paper feed port is closed by the stacked originals, the originals are discharged at a downward angle, and can be prevented from jumping out of the original feeder hopper.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment of a circulating document feeder according to the present invention.

FIG. 2 is a perspective view showing a detecting unit of the circulation type document feeder of the present invention.

FIG. 3 is a flowchart showing the operation of the present invention.

FIG. 4 is a diagram for explaining the operation of the present invention.

FIG. 5 is a diagram for explaining the operation of the present invention.

FIG. 6 is a schematic configuration diagram showing a second embodiment of the circulating document feeder of the present invention.

FIG. 7 is a schematic configuration diagram showing a third embodiment of the circulating document feeder according to the present invention.

FIG. 8 is a schematic configuration diagram showing a fourth embodiment of the circulating document feeder of the present invention.

FIG. 9 is a perspective view showing a fourth embodiment of the circulating document feeder according to the present invention.

FIG. 10 is a schematic configuration diagram showing a fifth embodiment of the circulating document feeder according to the present invention.

[Explanation of symbols]

 2 Document feed hopper 3 Detecting means 6 Paper feed port 7 Loading belt 16, 17, 29 Discharge path 18a Switching lever 18b, 24, 34, 39, 42, 52 Solenoid 20 Document loading amount detection lever 21 Detection lever return spring 22 Document loading amount detection sensor 27, 28, 30 Discharge port 31 Fixed rib 32 Movable rib 33, 37, 41, 47 Return spring 35 First roller 36 Elongated hole 38 Lever 40 Second movable rib 43, 44 Guide plate

Claims (7)

(57) [Claims] 1. A circulating document feeder having a document tray on which a plurality of documents are stacked, and sequentially feeding the plurality of documents stacked on the document tray from below through a paper feed port and returning to the top of the documents. A detecting means for detecting a stacking height of the originals stacked on the original tray, and discharging the originals at an upward angle or a downward angle to return the originals to the top of the originals stacked on the original tray. And a switching means for switching a discharge direction of the document on the discharge path based on a detection result of the detection means, wherein the stacking height of the document on the document tray is limited. Quantitative
The returned document is ejected at an upward angle in the following cases:
Stacking documents on the document tray.
If the height is higher than the specified amount, the returned document
It can be switched to the discharge path that discharges at an angle
Circulation type document unloading device . 2. A circulating document transport system having a document tray on which a plurality of documents are stacked, and sequentially feeding the plurality of documents stacked on the document tray from below through a paper feed port and returning the documents to the top of the documents. A detecting means for detecting a stacking height of the originals stacked on the original tray; and a plurality of vertically arranged discharge paths for returning the originals to the top of the originals stacked on the original tray. And a switching means for switching a discharge path of the document based on a detection result of the detection means , wherein the plurality of discharge paths are directed upward.
When the original is loaded on the original tray at an angle
Documents that are configured to return to the top of the
If the stacking height of the document is
Is switched to the discharge path that discharges at the angle
If the stacking height of the originals on the
Switch to the exit path where the original to be ejected is discharged at a downward angle
A recirculating document unloading device characterized by the following features . 3. The circulation type document unloading device according to claim 2, wherein the discharge ports of the plurality of discharge paths are provided at a position higher than a paper feed port. 4. A circulating document transporter having a document tray on which a plurality of documents are stacked, and a plurality of documents stacked on the document tray are sequentially loaded from a paper feed port from below and returned to the top of the documents. A detecting means for detecting a stacking height of the originals stacked on the original tray, a discharge path for returning the originals to the top of the originals stacked on the original tray, and a discharge port provided at the discharge opening of the discharge path. A movable rib disposed in a position facing the fixed rib, the movable rib being movable in a document conveying direction, and moving the position of the movable rib based on a detection result of the detection means to change a document discharge direction. A circulation type document unloading device comprising a driving unit. 5. A circulating document feeder having a document tray on which a plurality of documents are stacked, and a plurality of documents stacked on the document tray are sequentially loaded from a lower side through a paper feed port and returned to the top of the documents. A detecting means for detecting a stacking height of the originals stacked on the original tray, a discharge path for returning the originals to the top of the originals stacked on the original tray, and a discharge port provided at the discharge opening of the discharge path. A first roller, a second roller capable of changing a contact position between the first roller, a first roller that sandwiches the first roller, and discharges the document, and a second roller based on a detection result of the detection unit. A changing means for changing a contact position of the second roller with the first roller .
If the stacking height of the documents on the document tray is
The second document is returned so that the returned document is ejected at an upward angle.
Change the contact position of the roller with the first roller, and
If the stacking height of the originals on
Second roller so that the original to be discharged is discharged at a downward angle.
The contact position of the first roller with the first roller is changed.
Recirculating document delivery device . 6. A circulating document feeder having a document tray on which a plurality of documents are stacked, and a plurality of documents stacked on the document tray are sequentially loaded from below through a paper feed port and returned to the top of the documents. A detecting means for detecting a stacking height of the originals stacked on the original tray, a discharge path for returning the originals to the top of the originals stacked on the original tray, and a discharge port provided at the discharge opening of the discharge path. A second movable rib capable of moving in a direction perpendicular to the original discharging direction, and a driving unit for moving the position of the second movable rib based on the detection result of the detecting unit to change the original discharging direction; comprising a circulating document delivery system der
If the stacking height of the documents on the document tray is
The document so that the returned document is ejected at an upward angle.
Move the position of the movable rib 2 and stack the originals on the original tray.
When the loading height is higher than the specified amount, the returned document is
Move the position of the second movable rib so that it is ejected at an angle of
And a circulation type document unloading device . 7. A recirculating document transporter having a document tray on which a plurality of documents are stacked, and a plurality of documents stacked on the document tray are sequentially loaded from a lower side through a paper feed port and returned to the top of the documents. A detecting means for detecting a stacking height of the originals stacked on the original tray, a discharge path for returning the originals to the top of the originals stacked on the original tray, and an original discharge provided in the discharge path. That can rotate in a direction perpendicular to the direction
A recirculation type document unloading device , comprising: a pair of discharge guide pairs; and a drive unit for rotating the discharge guide pair based on a detection result of the detection unit to change a document discharge direction.
Returned when the stacking height of the original on B is less than the specified amount.
Set the output guide pair so that the original is
Turns and the stacking height of the documents on the document tray is higher than a predetermined amount.
The returned document is ejected at a downward angle.
Circulating element characterized by rotating a pair of discharge guides
Paper export device .