JPH11301856A - Automatic manuscript feeder and image reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure rear end alignment, independently from the weight and curling property of manuscripts to be handled and stable circulating and feeding operation. SOLUTION: An automatic document feeder includes a manuscript tray 15 for stacking documents, a feed means for separately feeding the stacked manuscripts, an discharge means fixed for discharging the fed manuscripts to the manuscript tray, a first rear end restricting member 38 provided in the manuscript tray and movable to the feeding direction of the manuscripts and a second rear end restricting member arranged corresponding to the rear end alignment position of the manuscripts different in size, protruded from the placement plane of the document tray, and erected and fixed thereto, also including a manuscript rear end supporting member at the upstream side in the carrying direction of the second rear end restricting member so that the rear ends of the manuscripts are pushed out toward the second rear end restricting member by the first rear end restricting member to provided alignment at the rear ends of the manuscripts in the condition that the rear ends of the documents are lifted up by the manuscript rear end supporting member.

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 a copying machine or the like, and more particularly to a circulating automatic document feeder for circulating a stacked sheet bundle a plurality of times. The present invention relates to an image reading apparatus equipped with a.

[0002]

2. Description of the Related Art In a conventional automatic document feeder, a document on a document tray is separated one by one by a separating means, and is conveyed to an image reading position on a platen glass by a feeding means and a delivering means. After the image reading operation by the main body is completed, there has been proposed a recirculating automatic document feeder which is again conveyed by a conveying means, discharged onto a document tray by a discharge means, and stacked again.

In the circulating automatic document feeder,
When copying a plurality of copies, the document reloaded on the document tray is again fed, copied, and reloaded, and the document is circulated a set number of times to complete a series of copying operations.

A conventional automatic document feeder 100 according to the related art will be described with reference to FIGS. 13 and 14. FIG. FIG.
FIG. 14 is an overall configuration diagram of an automatic document feeder according to a conventional example.
FIG. 15 is a diagram illustrating first and second rear end regulating plates, and FIG. 15 is a diagram illustrating operation of the first and second rear end regulating plates. FIG.
The recirculating automatic document feeder 100 shown in FIG. 1 has a configuration in which both the flow reading and the fixed reading of the document can be used at the same time. For the frequently used documents such as A4, LTR and B5, the document is separated by air feeding. Reading is performed by feeding using a method, and fixed reading using a separation method under belt retard is performed for documents of other sizes.

[0005] When performing the flow reading, first, the original tray 10
1 descends to a position where it can be read. Document tray 101
Separation air is blown from the separation device 102 to the bundle of documents P stacked thereon, and the bundle is fed by the suction belt 103. The fed original P is fed to the platen glass 105 by the wide belt 104.
The image is read while being conveyed at a constant speed, and is discharged onto the document tray 101 by the discharge means 106 and stacked.

On the original tray 101, a first rear end regulating plate 107 is provided.
And a second rear end regulating plate 108 for aligning the rear end of the original bundle. The first trailing edge regulating plate 107 is fixed to a trailing edge regulating plate supporting plate (not shown), supports the trailing edge of B5 and A4 size originals, and is movable so that the leading edge thereof reaches the separation device 102. Have been.

The second rear end regulating plates 108, 109 are rotatably supported by a shaft, are urged by a spring 110 in a direction opposite to the mounting surface of the original tray 101, and are positioned by a stopper member (not shown). ing. These second rear end regulating plates 108 and 109 are provided with arm portions 108a and 109a which engage with the first rear end regulating plate 107, respectively.

Further, hook members 111a, 111b for engaging and holding the second rear end regulating plates 108, 109 at their upright positions are rotatably supported on the base member of the apparatus main body. Are biased in a direction to engage with the second rear end regulating plates 108, 109, and are positioned by a stopper member (not shown).

At the time of feeding, the first rear end regulating plate 107 is
When the original is moved from the home position shown in FIG. 13A to the position shown in FIG. 13B to push the bundle of documents, for example, the arm 109a of the second rear end regulating plate 109 comes into contact with the first rear end regulating plate 107. The second rear end regulating plate 109 stands up and is fixed by the hook member 111b in this state. After the document bundle transfer operation is completed, the first rear end regulating plate 107 returns to the home position on the upstream side. Is done.

As described above, when the reading by the flow reading by the air separation is started, the documents which have been read are sequentially discharged onto the document tray 101 and stacked on the second rear end regulating plate 109. Then, the first trailing edge regulating plate 107 moves toward the second trailing edge regulating plate 109 in the same manner as when the bundle is transported, and transports the dropped document P to a position where it is aligned by the second trailing edge regulating plate 109.

By performing this every time a document is discharged, the discharged document P is regulated by the second rear end regulating plate 109 regardless of the size, despite the position of the discharge means 106 being fixed. , At a predetermined position. After a series of jobs are completed, the document tray 101
Rises, the second rear end regulating plates 108, 109 and the hook member 11
1a, 111b is disengaged and the second rear end regulating plate 108
, 109 are retracted from the mounting surface of the original tray again.

[0012]

However, the original used in the circulating type automatic original feeder is not always in a flat state, and the front and rear or right and left ends are curled up and down along the conveying direction. In a copier or the like, it is necessary to match them regardless of the state of these originals.

For example, in the case of a document curled downward in the transport direction and a document having a strong stiffness such as 128 g / m 2 or 200 g / m 2, the document trailing edge is pushed by the first trailing edge regulating plate 107 so that the second trailing edge is pressed. The control plate 109 can be moved over and adjusted to a predetermined feeding standby position. But 52g / m2 or 64
In the case of an original having a weak stiffness such as g / m2, the original buckles as shown in FIG. 15 and is sandwiched between the first rear end regulating plate 107 and the second rear end regulating plate 109, The trailing edge of the document cannot get over the second trailing edge regulating plate and cannot be moved to the feeding standby position.

For this reason, the next feeding operation is performed at a position downstream of the predetermined feeding standby position in the conveying direction, and as a result, feeding failure such as double feeding or misfeeding occurs at the time of re-feeding. There was a problem that would be.

Accordingly, the present invention provides a circulating automatic document feeder and an image reading device which realize a reliable trailing edge alignment irrespective of the weighing or curling state of a document to be handled and perform a stable circulating supply operation. It is an object.

[0016]

In order to solve the above-mentioned problems, a typical configuration of an automatic document feeder and an image reading apparatus according to the present invention comprises a document tray on which documents are stacked, and the loaded document. Feeding means for separating and feeding, a discharging means fixedly provided for discharging the fed document to the document tray, and a first rear end regulating member provided on the document tray and movable in a document feeding direction. And an automatic document feeder having at least one or more different size originals and a second rear end regulating member that is arranged corresponding to the rear end alignment position of the originals and that is protruded from the mounting surface of the original tray and is fixed upright. A document rear end support member is provided on the upstream side in the transport direction of the second rear end regulating member, and the document rear end is lifted by the document rear end support member, and the first rear end regulating member is The trailing edge of the document is regulated to the second trailing edge Characterized by being configured so as to align the trailing edge of the document by extruding toward the wood.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] An embodiment of an automatic document feeder and an image reading apparatus according to the present invention will be described with reference to the drawings. 1 is a main cross-sectional view of the automatic document feeder according to the present embodiment, FIG. 2 is an overall configuration diagram of the image reading device according to the present embodiment, FIG. 3 is a top view of the automatic document feeder, and FIG. Top view of the automatic document feeder with the document tray removed,
FIG. 5 is a view showing details of an air separation feeding mechanism, FIG. 6 is a schematic perspective view of a document tray, FIG. 7 is a side view of an automatic document feeding apparatus,
FIG. 8 is a diagram showing the operation of raising the second rear end regulating plate, and FIGS. 9 to 11 are diagrams illustrating the operation of aligning the rear end of the document discharged on the document tray.

In the present embodiment, an electrophotographic copying machine is used as an example of the image reading apparatus 1, and an automatic document feeder 2 according to the present invention is provided above the image reading apparatus 1. First, a schematic configuration of the entire image reading apparatus 1 will be described with reference to FIG.

[Image Reading Apparatus] In the image reading apparatus 1 shown in FIG. 2, the recording sheets stacked on the feeding tray 3 are separated and fed by a feeding roller 3a, and are further imaged by a registration roller pair 5a as a conveying means. It is transported to the recording unit 5.

A scanner unit 4 is provided above the image reading apparatus 1, and includes a well-known document illumination lamp 4a, a first mirror 4b, a second mirror 4c, a third mirror 4d, a zoom lens 4e, and a fourth mirror. 4f enables the document information on the platen 6 to be transmitted to the photosensitive drum 7. The scanner unit 4 can read an image while the document illumination lamp 4a reciprocates below the platen 6 by fixing the document at a fixed position, and fixes the document by fixing the document illumination lamp 4a at the fixed position. It is configured so that the image can be read while moving.

The image recording section 5 includes a known photosensitive drum 7, a charging device 8, a developing device 9a for developing an electrostatic latent image on the photosensitive drum 7 with toner, and a cleaner for removing waste toner from the photosensitive drum 7. 9b and the like. A separation charger 10 is disposed near the photosensitive drum 6, and transfers a toner image to a conveyed recording sheet.

The sheet material P on which the toner image has been transferred is a fixing device.
Then, the toner image is fixed by applying heat and pressure to the toner image. Thereafter, the sheet is discharged to the discharge unit 13 by the discharge roller 12 and is stacked, or the reversing unit is used.
The image is re-fed to the image recording unit 5 by 14 to form an image on the back surface.

[Automatic Document Feeder] The automatic document feeder 2 shown in FIG. 1 is a circulation type automatic document feeder that circulates a bundle of documents P stacked on a document tray 15 a plurality of times. In the automatic document feeder 2 according to the present embodiment, air is fed to the separation / feeding means as described later for the purpose of reducing the damage given to the document by the separation means during circulation and improving the productivity. Has adopted.

In the automatic document feeder 2 shown in FIG. 1, depending on the setting mode and the size of the document P, fixed reading is carried to a switchback path (direction of arrow A), and is conveyed to a closed loop path (direction of arrow B). It has a configuration that can be used together with drift reading.

For example, if the original P is of a large size (for example, H
4, A3 size, etc.) or different sizes are mixed, the document P is separated and fed from the switchback path by the cooperation of the retard belt 17 and the feed roller 18, and is conveyed via the predetermined path PH1. The image reading device 1 is placed at a predetermined position on the platen 6 by the rollers 19. When the image of the document P is read by the scanner unit 4 at this position, the discharge path PH2 is returned in the direction of arrow C by the reversing roller 20, and the document tray 15 is again moved by the discharge roller 21.
Returned to the top.

Also, small-size paper such as A4, LTR, and B5, which are frequently used, is fed from a closed loop path (in the direction of arrow B) by an air feeding separation method described later, and passes through a predetermined path PH3. After being positioned at a predetermined position on the platen 6 of the reading apparatus 1 and reading the image, the sheet is conveyed along the discharge path PH2 in the direction of arrow C and returned to the document tray 15 again.

Above the document tray 15, there is provided a recycle lever 16 for separating the document P before conveyance and the document P after conveyance, and for detecting the thickness of the document P before conveyance. In this configuration, there are two recycling levers depending on the size.
16 are provided. This recycling lever 16 is
The document P is placed on the uppermost portion of the bundle of documents when the transport of the document P is started, and then the document P is separated and fed from the lowermost portion. This allows
When the recycle lever 16 is lowered below the original placing surface of the original tray 15, it is possible to know that all the originals P have been fed.

When a copy button (not shown) is pressed,
The document tray 15 is lowered to a position where the document can be fed to the closed loop path. Inside the side regulating plate 23, the recycling lever 16
A means (not shown) for detecting the bundle thickness of the document P from the rotation angle of, for example, a gear train for amplifying the amount of rotation of the recycle lever 16 and for outputting the amplified amount of rotation as the number of generated pulses A detection unit having a known configuration such as a configuration including a slit plate and a photo sensor is housed therein.

When the recycle lever 16 lands on the original bundle by the detection means, a pulse signal corresponding to the bundle thickness is generated, and the signal is sent to an MPU (not shown) for controlling the apparatus main body. The MPU controls the air feeding means based on the obtained detection signal.

As shown in FIG. 3 and FIG.
15 is provided with an opening for avoiding the suction belt 22. The suction belt 22 is a rubber belt having a large number of holes 22a.
A suction valve (not shown) for performing N / OFF is arranged. Then, the document P can be sent out by rotating the suction belt 22 while sucking from the vacuum box 34 by the blower 35.

As shown in FIG. 5, the air separating device 24 includes a separating air valve 25 for turning ON / OFF the separating air, a separating air duct 26, a plurality of separating air nozzles 27,
And a fan motor 28 as shown in FIG. M
The PU calculates the number of pulses sent from the detection means, and issues a drive signal to the stepping motor for driving the separation air valve based on the LUT representing the relationship between the number of pulses and the amount of rotation of the separation air valve 25, and controls the separation air valve 25. Rotate a predetermined amount. At the same time, the MPU issues a drive signal to the fan motor 28 for separation air, and blows out separation air having an air volume according to the bundle thickness.

The blown air acts to blow air between the lowermost original P taken out by the suction belt 22 and the bundle of originals thereon, and when the originals are taken out of a stack of two sheets, the air is blown. And only the lowermost document P can be sent out.

In the above separating apparatus, in order to prevent double feeding of the second and subsequent documents P, the document tray 15 is tilted by a predetermined angle so that the downstream side in the transport direction is positioned higher than the upstream side. Configuration is common. Accordingly, the trailing end of the document bundle is placed on the document tray 15 in a state where the trailing end thereof abuts against a second trailing end regulating plate 39 described later.

The fed document P is sent to the platen 6 via the transport roller 29 and the registration roller 30. Further, a backup roller 31 is provided in the transport path, and is advantageously configured to handle thick paper and the like.

Before the platen 6, a turn flapper 32 is provided.
When the document P is fed to the platen 6, the document P is positioned above the edge 6a of the platen so that the document P does not catch on the edge 6a. When the original is fed from the manual feed path 33 provided on the side of the automatic document feeder 2, the turn flapper 32 is positioned above the edge 6a. In order to scoop the original, the original is retracted below the edge portion 6a. The document P returned at this time is guided to the manual feed path 33 by the flapper 37 and discharged.

The original P reaching the platen 6 is a wide belt.
The paper is conveyed on the platen 6 at a constant speed by 36, and is discharged onto the document tray 15 by the discharge roller 21. By repeating this, all the stacked originals P can be conveyed.

[Rear End Restriction Member] As shown in FIGS. 3 and 7, the original tray 15 is provided with a first rear end restriction plate 38 driven by the rear 48 (see FIG. 4). The trailing edge regulating plate support plate (not shown) to which the trailing edge regulating plate 38 is fixed holds the trailing edge of the document P of A4 and B5 sizes when the document P is fed from a closed loop path (arrow B direction). The second rear end regulating plates 39 and 40 are rotatably supported.

A document trailing end lifting member 45 is provided at both ends of the document tray. Below the lifting member 45, a driving cam 46, a bottom portion 47a, a slope portion 47b, and a top surface portion are provided.
A cam drive gear 47 composed of 47c is arranged. The cam drive gear 47 is driven by being powered by a drive motor 49. In the present embodiment, the drive motor 49 uses a stepping motor for downsizing.

The second rear end regulating plates 39 and 40 are urged by a spring 41 in a direction of retreating from the mounting surface of the document tray 15, and are positioned by a stopper member (not shown). The second rear end regulating plates 39 and 40 respectively have a first rear end regulating plate 38.
The arm portions 39a and 40a are provided so as to abut the second rear end regulating plates 39 and 40 in response to the movement of the first rear end regulating plate 38.

Hook members 42a and 42b for engaging and holding the second rear end regulating plates 39 and 40 at their upright positions as described later are rotatably supported on the base member of the apparatus body. It is urged by a spring 43 in a direction to engage with the second rear end regulating plates 39 and 40, and is positioned by a stopper member (not shown).

When the first rear end regulating plate 38 conveys the document bundle before the start of conveyance, the second rear end regulating plates 39 and 40 move the arm portions 39a and 39a just before the end of the operation. It is raised by engaging and rotating with 40a. When the hook members 42a and 42b are engaged in the upright state, the state can be maintained.

Further, the structure described below will prevent the second rear end regulating plate 39 for A4 size originals from rising when the first rear end regulating plate 38 is operated to transfer a bundle of B5 size originals. Is provided.

That is, a rack member engaged with a pinion gear integrated with a potentiometer for detecting the document width is fixed to the side regulating plate 23 on the back surface of the document tray 15, and the width of the document is detected by a known configuration. doing. On the other hand, a lever 44 that engages with the A4 size second rear end restriction plate 40 is rotatably supported on the rear end restriction plate support plate via a shaft 44a,
One end is engaged with the convex portion of the rack member on the back surface of the side regulating plate 23, and the other end is engaged with the arm portion 40 a of the second rear end regulating plate 40.

When the side regulating plate 23 is set at the position of A4 or LTR original size, the convex portion of the rack member and the lever 44 are engaged, and the lever 44 rotates as shown in FIG. Accordingly, the lever 44 is moved to the second rear end regulating plate 39 for A4.
The second rear end regulating plate 39 is rotated by contacting the arm 39a of the second end. As a result, the arm 39a is cut into the notch 38 of the first rear end regulating plate
After passing through a, it moves from the position shown in FIG. 8A to the position shown in FIG. In this state, the second rear end regulating plate 39 does not protrude above the document tray 15.

As described above, the position of the second rear end regulating plate 39 for A4 is changed in conjunction with the movement of the side regulating plate 23, so that the second rear end regulating plate 39 becomes an A4 document. Otherwise, for example, when a document P of B5 size is stacked, the first rear end regulating plate 38 does not stand up even if moved.

When the original bundle is transferred to a position where the air can be separated, the first rear end regulating plate 38 returns to the home position on the upstream side, and the original bundle is maintained in the upright state as shown in FIG. Backed by 40.

As described above, when the feeding by the air separation is started, and the original P is discharged from the discharge roller 21 through the platen 6, the discharged original P falls and falls as shown in FIG. It is placed so as to ride on the end regulating plate 40.
Thereafter, the drive motor 49 is driven, and the drive is transmitted to the cam drive gear 47, and the cam drive gear 47 rotates in the direction of arrow L in FIG. At this time, the driving cam 46 is a cam driving gear
When the vehicle rides on the inclined surface 47b of the 47 and is further pushed up by the upper surface 47c, it rotates counterclockwise around the fulcrum 50. Accordingly, the upper end 46b of the cam pushes up the lifting member 45 as shown in FIG. 10, and the lifting member 45 lifts the rear end of the document P.

After this, the rear drive motor 48 is driven to move the first rear end regulating plate 38 in the direction of arrow N (see FIG. 5) and push the rear end of the dropped document P to get over the second rear end regulating plate 40. Let it. As a result, as shown in FIG. 11, the document P is supported at the rear end by the second rear end regulating plate 40 and waits at a predetermined position, and then waits for feeding at the next time. When the cam drive gear 47 further rotates in the L direction and the cam lower end 46a reaches the bottom surface 47a, the drive cam
46 is lowered to the initial position shown in FIG.

By performing the above operation for each discharged document, the discharged document P is regulated by the second rear end regulating plate 40 even if the position of the discharge roller is fixed regardless of the document size. Will be aligned at the position. In addition, since the original P is transported with the rear end thereof lifted, even if the rear end of the original to be aligned is curled or folded down, the original P whose rear end is pushed in is moved to the first rear end. There is no risk of being caught between the end regulating plate 38 and the second rear end regulating plate 40.

[Second Embodiment] Next, a second embodiment of an automatic document feeder and an image reading apparatus according to the present invention will be described with reference to the drawings. FIG. 12 is a side view of a main part of the automatic document feeder according to the present embodiment. Parts that are the same as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in the figure, the automatic document feeder 2 according to the present embodiment does not include the lifting member 45 or the driving cam 46, and the second rear end regulating plate 40 is closer to the first rear end regulating plate 38. The slope member 51 is integrally attached to the fin. Slope 51a of slope member 51
Is lower so that the upstream side in the transport direction approaches the document tray 15, and higher in the upstream side in the transport direction so as to approach the tip of the second rear end regulating plate 40.

The dropped document P1 discharged from the discharge roller 21
Are stacked so as to cover the second rear end regulating plate 40 of the document tray 15. Thereafter, the first rear end regulating plate 38 receives the driving force by the driving motor 48 and moves in the direction of arrow N,
1 is pushed into the second rear end regulating plate 40 side. The trailing edge of the dropped document P1 whose rear end is pushed moves along the slope 51a of the slope member 51, and is pushed without being caught between the first rear end regulating plate 38 and the second rear end regulating plate 40. Then, the rear end is supported over the second rear end regulating plate 40. In this way, it is possible to prepare for the next re-feed at a predetermined atmospheric position.

The automatic document feeder according to the present embodiment has the advantages that the size of the apparatus can be reduced and that a new drive source is not required.

In the above embodiment, the configuration using air separation in the circulating supply has been described. However, the automatic document feeder according to the present invention is not limited to the air separation, but is known. Any separation method may be used. Further, although the size of the document to be circulated and supplied is shown as a half size such as B5, A4, or LTR, a configuration including a large size such as A3 or A4 is also applicable.

[0055]

As described above, in the automatic document feeder and the image reading apparatus according to the present invention, the rear end of the document which raises the rear end of the document to the upstream side in the transport direction of the second document rear end regulating member. By providing the support member, even if the rear end of the original to be aligned is in a state of a lower curl or a bent bottom, it is ensured that the rear end of the first and second originals is not caught between the first and second original rear end regulating members. It can be moved to the standby position. Therefore, even when circulating a plurality of times, it is possible to realize reliable re-feeding without causing a feeding failure such as double feed or misfeed.

[0056]

[Brief description of the drawings]

FIG. 1 is a main cross-sectional view of an automatic document feeder according to a first embodiment.

FIG. 2 is an overall configuration diagram of the image reading apparatus.

FIG. 3 is a top view of the automatic document feeder.

FIG. 4 is a top view of the automatic document feeder with a document tray removed.

FIG. 5 is a diagram showing details of an air separating and feeding mechanism.

FIG. 6 is a schematic perspective view of a document tray.

FIG. 7 is a side view of the automatic document feeder.

FIG. 8 is a view showing an upright operation of a second rear end regulating plate.

FIG. 9 is a diagram illustrating an operation of aligning the rear end of a document discharged onto a document tray.

FIG. 10 is a diagram illustrating an operation of aligning a rear end of a document discharged onto a document tray.

FIG. 11 is a diagram illustrating an operation of aligning the rear end of a document discharged onto a document tray.

FIG. 12 is a side view of a main part of an automatic document feeder according to a second embodiment.

FIG. 13 is an overall configuration diagram of an automatic document feeder according to a conventional example.

FIG. 14 is a diagram illustrating first and second rear end regulating plates.

FIG. 15 is a diagram illustrating the operation of the first and second rear end regulating plates.

[Explanation of symbols]

 P: Document 1: Image reading device 2: Automatic document feeder 3: Feed tray 3a: Feed roller 4: Scanner unit 4a: Document illumination lamp 4b: First mirror 4c: Second mirror 4d: Third mirror 4e ... Zoom lens 4f ... Fourth mirror 5 ... Image recording unit 5a ... Registration roller pair 6 ... Platen 6a ... Edge 7 ... Photosensitive drum 8 ... Charging device 9 ... Cleaner 10 ... Separation charger 11 ... Fixer 12 ... Discharge roller 13 … Discharge unit 14… Reversing unit 15… Document tray 16… Recycle lever 17… Retard belt 18… Feed roller 19… Transport roller 20… Reverse roller 21… Discharge roller 22… Suction belt 22a… Hole 23… Side regulating plate 24… Air separation device 25… Separation air valve 27… Separation air nozzle 28… Fan motor 29… Transport roller 30… Registration roller 31… Back up Roller 32: Turn flapper 33: Manual feed path 34: Vacuum box 35: Blower 36: Wide belt 37: Flapper 38: First rear end regulating plate 38a: Notch 39: Second rear end regulating plate 39a: Arm 40: First 2 rear end regulating plate 40a ... arm 41 ... spring 42 ... hook member 43 ... spring 44 ... lever 44a ... shaft 45 ... lifting member 46 ... drive cam 46a ... cam lower end 46b ... cam upper end 47 ... cam drive gear 47a ... bottom part 47b ... slope part 47c ... top part 48 ... drive motor 49 ... drive motor 50 ... fulcrum 51 ... slope member 51a ... slope part

Claims (4)

[Claims] An original tray for stacking the originals; a feeding unit for separating and feeding the stacked originals; a discharging unit fixedly mounted for discharging the fed originals to the original tray;
A first rear end regulating member provided on the document tray and movable in a document feeding direction, and at least one or more different sizes of the document are arranged corresponding to the rear end alignment position of the document from the mounting surface of the document tray; An automatic document feeder having a second rear end regulating member that protrudes and stands up, a document rear end supporting member provided upstream of the second rear end regulating member in the conveying direction, and the document rear end supporting member The first rear end regulating member pushes the rear end of the document toward the second rear end regulating member in a state where the rear end of the original is lifted, thereby aligning the rear end of the original. An automatic document feeder characterized by the following. 2. The document trailing edge support member is rotatably attached to the document tray, and is rotated by a cam mechanism provided in the automatic document feeder body to lift the trailing edge of the document. 2. The automatic document feeder according to claim 1, wherein the automatic document feeder is configured as described above. 3. The document trailing end support member is a slope member provided on the upstream side in the transport direction of the second rear end regulating member, and the slope member is such that the upstream side in the transport direction approaches the document tray and is downstream. 2. The automatic document feeder according to claim 1, wherein a side of the automatic document feeder has a slope approaching a tip of the second rear end regulating member. 4. An automatic document feeder according to claim 1, further comprising: a platen glass on which the document is placed or passed; and a reading means for reading an image of the document on the platen glass. Image reading device.