JPH09315701A - Automatic document carrying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly move document stocked at the stocking position to a document set position by a pushing plate by providing a control means to drive a feed motor and operate a feed belt of a vacuum separation and feed means when the pushing plate is pushed to the pushing position. SOLUTION: When a suction blower 36 is driven and the air in a vacuum chamber 26 is sucked, a lowest document among documents loaded on a document table 12 is sucked by a feed belt 32 of a vacuum separation and feed means 24. An electric motor 624 (M2) of a separation air ejecting means 62 is driven to operate a blower 623, the air is ejected from a nozzle 622 to a front end loaded on the original table, the air is blown between documents loaded on the document table 12, and each document is shuffled to separate the lowest document and sucked by the feed belt 32. The lowest document to be pushed out by a pushing plate can be prevented from being hooked by the feed belt.

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 installed in a document processor such as an electrostatic copying machine, and more particularly to an automatic document feeder equipped with a vacuum type document separating / feeding means.

[0002]

2. Description of the Related Art In recent years, a copying machine has come to use an automatic document feeder for automatically feeding a plurality of documents to a document setting position on the upper surface of a transparent plate in accordance with the speeding up and automation of the copying process. There is. This kind of automatic document feeder has
A document separating / feeding mechanism is provided for separating and feeding the lowest one of a plurality of documents placed on a document table. This type of document separating / feeding mechanism includes a plurality of documents which are arranged below a guide plate arranged in front of the document table in the conveying direction and which are projected upward through an opening formed in the guide plate. What is generally used is composed of a feeding roller having a roller and a separating belt mechanism which is arranged above the feeding roller so as to face the feeding roller. However, since such a document separating / feeding mechanism is configured such that a large frictional force acts between the lowest document and the second document from the bottom, the lowest document is In the case of writing with a writing instrument such as a pencil, which tends to fall off by frictional contact, there is a problem that the back surface of the second document from the bottom is stained by the lowest document.

As a document separating / feeding mechanism for solving the above problems, a document table having an opening at the front portion in the document conveying direction,
A vacuum chamber disposed below the opening of the document table and having an opening on the upper surface, a driving roller and a driven roller disposed parallel to each other on the front side and the rear side of the vacuum chamber in the document transport direction, and the driving roller. A lowermost original among the originals placed on the original table, including a driven roller and a vacuum separating / feeding means provided with a feeding belt having a plurality of holes wound around the vacuum chamber. The document separating and feeding mechanism of the automatic document feeder is designed to feed while adsorbing the
For example, JP-A-56-56443 and JP-A-62.
No. 93141.

On the other hand, the original fed by the original separating / feeding mechanism is conveyed onto a transparent plate, exposed on the transparent plate, returned to the original set on the original table, and repeatedly processed. A so-called circulation type automatic document feeder which is made possible has also been put into practical use.

[0005]

In the case where the originals which have been exposed on the transparent plate and then returned to the original table are stocked at the stock position on the rear side of the original set position in the original conveying direction and repeatedly processed. Is pushed out to the document setting position by the push-out plate provided in the document discharge section. At this time, since the vacuum type document separating / feeding mechanism is stopped, the lowest document is caught on the rubber feeding belt forming the vacuum type document separating / feeding mechanism,
Doing so may cause the original to break or jam.

The present invention has been made in view of the above facts, and its main technical problem is to repeatedly process originals that have been exposed on a transparent plate and then returned to the original table and stocked at the stock position. Another object of the present invention is to provide an automatic document feeder that can smoothly move stocked documents to a document setting position by means of an extruding plate.

[0007]

According to the present invention, in order to achieve the above-mentioned technical objects, a document table having an opening at a front portion in the document conveying direction, and an upper surface below the opening of the document table. Is provided with a vacuum chamber which is arranged substantially flush with the upper surface of the original table and has an opening on the upper surface, and a plurality of holes which are arranged by winding the vacuum chamber and are operated in the original conveying direction. A belt, separation air ejecting means for ejecting air toward the front end of a document placed on the document table, and a document setting position provided at a stock position behind the document setting position on the document table in the document conveying direction. Vacuum separating and feeding means including a discharge document stopper configured to be operable between a regulation position positioned on the set document set on the sheet and a retracted position retracted from the regulation position. Original convey means for conveying a document fed by the vacuum separating and feeding means on a transparent plate,
A document discharging unit that discharges a document on the transparent plate to a stock position on the document table, a retracted position that is mounted on the document discharging unit and corresponds to a rear end of the document located at the stock position on the document table, and An extruding plate configured to be operable between an extruding position for positioning the front end of the original on the original table to the original setting position, a feeding motor for driving the feeding belt of the vacuum separating and feeding means, and the extruding plate. A push-out plate drive means for operating the push-back plate drive means to the retracted position and the push-out position, and a control means for driving and controlling the feeding motor and the push-out plate drive means, the control means including the push-out plate drive means. When the pushing plate is driven to push the pushing plate to the pushing position, the feeding motor is driven to operate the feeding belt of the vacuum separation feeding means.
An automatic document feeder is provided.

According to the invention, the control means is
There is provided an automatic document feeder for driving and controlling the feeding motor and the pushing plate driving means so that the moving speed of the feeding belt and the pushing speed of the pushing plate are substantially the same.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of an automatic document feeder constructed according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an upper end portion of an electrostatic copying machine 2 and an automatic document feeder 4 mounted on the upper end portion. The electrostatic copying machine 2 has a housing 6, and a transparent plate 8 which may be a glass plate is arranged on the upper surface of the housing 6. On one side (the left side in FIG. 1) of the transparent plate 8, a document regulating member 10 that determines a document setting reference position is arranged.
An automatic document feeder 4 constructed in accordance with the present invention is mounted on the upper surface of a housing 6 of an electrostatic copying machine 2 so as to be rotatable about a rotation axis extending along a rear side edge of a transparent plate 8. . When a document is manually placed on the transparent plate 8 of the electrostatic copying machine 2, the automatic document feeder 4 is swung upward from the closed position shown in the drawing to the open position to expose the transparent plate 8. A document is placed at a desired position on the transparent plate 8, and the automatic document feeder 4 is set to the closed position shown to cover the transparent plate 8 and the document placed on the transparent plate 8. When a document is placed on the transparent plate 8, one edge of the document is brought into contact with the leading edge of the document regulating member 10 and the one edge of the document is positioned at the document setting reference position so that the document is placed at a desired position. Can be positioned at. Transparent plate 8 using automatic document feeder 4
When the original is automatically loaded onto the transparent plate 8 and automatically loaded from the transparent plate 8, the automatic document feeder 4 is used in the closed position.

Continuing the description with reference to FIGS. 1 and 2, the illustrated automatic document feeder 4 includes side plates 11 arranged at intervals in the front-rear direction (direction perpendicular to the paper surface in FIG. 1). An original table 12 is provided as an original placing means disposed between (only the back side plate is shown by a two-dot chain line in FIG. 1). The document table 12 is provided with a large first opening 14 at the front side (the left side in FIGS. 1 and 2) in the document transport direction on the back side (upper side in FIG. 2), and the first opening 14 is provided. A second opening 16 smaller than the first opening 14 is formed on the front side (on the left side in FIG. 2) in the document conveying direction on the front side of the opening 14. Further, the document table 12 has a pair of guide grooves 18, 18 extending in the width direction behind the second opening 16 in the document transport direction.
Is provided. Support leg portions of a width regulating member 20 for regulating the widthwise position of the document placed on the document table 12 are fitted into the pair of guide grooves 18, 18. The width regulating member 20 is configured to be movable in the vertical direction in FIG. 2 along the pair of guide grooves 18, 18. In the automatic document feeder 4 in the illustrated embodiment, the position reference of the document placed on the document table 12 is the back side (one side) reference, and the document is placed upright on the back side of the document table 12. The widthwise position of the document placed on the document table 12 is regulated by the inner surface of the side plate 22 and the inner surface of the width regulating member 20. A sensor hole 17 is provided on the back side of the front end of the document table 12 in the document transport direction, and a reflective first document detection sensor 21 (SW1) is arranged below the sensor hole 17. Has been done. This first document detection sensor 21 (SW1)
Detects a document placed on the document table 12 and sends a detection signal to the control means 100 described later. Further, the document table 12 has a front side (see FIG. 2) of the second opening 16.
The sensor hole 18 is provided at a position corresponding to (the lower side in FIG. 2), and the reflective second original detection sensor 23 (SW2) is provided below the sensor hole 18. This second
The document detection sensor 23 (SW2) of the document table 12
When the size of the document placed on the upper side in the width direction is larger than the second opening 16 from the inner surface of the side plate 22, that is, the document table 1
It functions as a document detecting unit that detects whether or not the document placed on the second sheet is positioned on the second opening 16, and sends the detection signal to the control unit 100 described later. The document detecting means for detecting whether or not the document placed on the document table 12 is positioned on the second opening 16 is a device for detecting the document size by the moving position of the width regulating member 20. The detection signal may be used.

A vacuum separating / feeding means 24 is provided below the original table 12 in correspondence with the first opening 14. This vacuum separating and feeding means 24 is
Vacuum chamber 26 and the vacuum chamber 26
Of the driving roller 28 and the driven roller 30, which are arranged in parallel to each other on the front side and the rear side of the original conveying direction, the driving roller 28, the driven roller 30, and the vacuum chamber 26.
Is provided and is provided with four feeding belts 32. The vacuum chamber 26 is made of a synthetic resin, and has four openings 261 on the front side in the original conveying direction and four openings 262 on the rear side in the original conveying direction of the four openings 261 on the upper wall. ing. The vacuum chamber 26 thus configured is attached to the lower surface of the original table 12 by an appropriate supporting means (not shown) so that the upper surface thereof is substantially flush with the upper surface of the original table 12. The vacuum chamber 26 is connected to a suction blower 36 via a duct 34 connected to a hole (not shown) formed in a wall on the back side thereof. The drive roller 28 is provided so as to penetrate through support walls 263 and 264 provided so as to project from both side walls of the vacuum chamber 26 to the front side in the document transport direction, and both ends thereof project downward from the lower surface of the document table 12. Provided support wall 12
A rotary shaft 281 rotatably supported by bearings 37 and 38 on the bearings 1 and 122, the above four openings 261 on the rotary shaft 281, and four rollers 282 arranged corresponding to the document conveying direction. It consists of A roller drive gear 39 is loosely fitted to the other end of the rotary shaft 281 of the drive roller 28 thus configured, and the roller drive gear 39 is provided.
Electromagnetic clutch 35 for power transmission coupling the rotating shaft 281
(CLT1) is provided. The electromagnetic clutch 35 (CLT1) is energized by the control means 100 described later. Roller drive gear 39
Is an electric motor 6 as a feeding motor as shown in FIG.
0 (M1) is a power transmission mechanism 6 such as a gear mechanism or a belt mechanism.
Transmission coupled via 01, 602 and 603. The electric motor 60 (M1) is equipped with a rotation amount detecting means 600 (FG1) such as a rotary encoder or a frequency generator that constitutes the document conveying amount detecting means, and a pulse signal which is a detection signal thereof will be described later. To the control means 100. The driven roller 30 includes a shaft 301 supported by supporting walls 265 and 266 provided on both side walls of the vacuum chamber 26 so as to project to the rear side in the document transport direction, and the shaft 301 supports the four openings 262 and the document transport. It is composed of four rollers 302, each of which is rotatably arranged corresponding to the direction. The above four feeding belts 32
Has a plurality of holes 321 and is wound around each roller 282 and the roller 302 corresponding to the original conveying direction of the driving roller 28 and the driven roller 30, respectively. The feeding belt 32 configured as described above is arranged so that its upper surface is located slightly above the upper surface of the document table 12.

Below the original table 12, as shown in FIG. 2, the feeding drum 4 is provided corresponding to the second opening 16.
0 is provided. As shown in FIGS. 3 and 4, the feeding drum 40 is made of synthetic resin and is provided with a plurality of holes 401 around it. One end of the feeding drum 40 is open, and the duct 42 connected to the vacuum chamber 26 is inserted from the opened one end. The duct 42 includes a suction section 421 and a connection section 422. The suction part 421 has an opening 4 as shown in FIG.
Equipped with 23. The opening 423 is formed such that only the upper side of the suction portion 421 is opened in the axial direction. This opening 42
The upper end sides of the side walls 424 and 425 of the duct 42 forming No. 3 are formed as close to the inner peripheral surface of the feeding drum 40 as possible. Therefore, each of the plurality of holes 401 formed in the feeding drum 40 faces the opening 423 of the duct 42 and communicates with the duct 42 only when positioned above. A bearing 44 is disposed between one end of the connecting portion 422 forming the duct 42 on the suction portion 421 side and one end of the feeding drum 40, and the feeding drum 40 is rotatably supported by the duct 42. ing. Between the duct 42 and the vacuum chamber 26, an opening / closing valve 46 that constitutes an opening / closing means that connects or disconnects the vacuum chamber 26 and the feeding drum 40 is provided. The open / close valve 46 includes a valve housing 461 and a butterfly valve 463 mounted on a valve shaft 462 mounted on the valve housing 461. One end of the valve housing 461 is inserted and connected into the vacuum chamber 26 through a connection hole 267 formed in the side wall of the vacuum chamber 26. A flange 464 is provided on the outer circumference of one end of the valve housing 461, and the insertion into the vacuum chamber 26 is restricted. The flange 464 is used for the vacuum chamber 26.
It is fixed to the side wall of the device by fixing means such as screws. The other end of the valve housing 461 is inserted and connected to the other end of the connecting portion 422 that forms the duct 42. A flange 465 is also provided on the outer circumference of the other end of the valve housing 461 to restrict the insertion into the duct 42. A lever 466 is attached to the valve shaft 462 of the on-off valve 46 thus configured, and the lever 466 is connected to the plunger of the solenoid 468 (SOL1) via a link mechanism (see FIG. 2). . The butterfly valve 463 operated by the solenoid 468 (SOL1) is in a closed state when the solenoid 468 (SOL1) is deenergized, and opens when the solenoid 468 (SOL1) is energized. The solenoid 468
(SOL1) is the second original detection sensor 23 (SW
When the document 2) does not detect the document, it is deenergized, and when the second document detection sensor 23 (SW2) detects the document, it is energized by the control means 100 described later.

An end wall 402 is provided at the other end of the feeding drum 40.
Is provided. At the center of this end wall 402 is a boss 4.
03 is formed, and the shaft fitting hole 404 is formed in the boss 403.
And a pin fitting groove 405 are provided. Feeding drum 40
One end portion of the rotary shaft 48 is fitted into the shaft fitting hole 404 provided in the boss 403 of the end wall 402 constituting the. A pin insertion hole 481 is formed in the rotary shaft 48 so as to pass through the shaft core in a radial direction, and a pin 50 fitted in the pin insertion hole 481 is formed in the pin fitting groove formed in the boss 403. The drive force of the rotary shaft 48 is transmitted to the feeding drum 40 by being fitted with 405. A bearing 52 is arranged between one end of the rotary shaft 48 inserted into the feeding drum 40 and one end of the suction portion 421 forming the duct 42, and the other end of the duct 42 is provided at the rotary shaft 48. Is rotatably supported at one end thereof. This rotating shaft 48
Has an intermediate portion rotatably supported by a support wall 123 provided so as to project downward from the lower surface of the original table 12 via a bearing 54, and has the other end rotatably supported by the support wall 121 by a bearing 58. Is supported by. Rotating shaft 4
A feed drum drive gear 59 is loosely fitted to the other end portion of 8, and an electromagnetic clutch 56 (CLT2) for transmitting and coupling the feed drum drive gear 59 to the rotary shaft 48 is provided. . Therefore, the electromagnetic clutch 56 (CLT2)
Is deenergized, the rotary shaft 48 and the feed drum drive gear 59 can rotate relative to each other, and the electromagnetic clutch 56
When (CLT2) is urged, the rotary shaft 48 and the feed drum drive gear 59 are transmission-coupled. The feed drum drive gear 59 is transmission-coupled to the roller drive gear 39 via an intermediate gear 57 as shown in FIG. It should be noted that the number of teeth of the intermediate gear 57 and the feed drum drive gear 59 as the drive means for transmitting power from the roller drive gear 39 to the drive shaft 48 of the feed drum 40 is the same as that of the drive roller of the vacuum separation feed means 24. It is set so that the moving speed of the feeding belt 32 operated by 28 and the peripheral speed of the feeding drum 40 are substantially the same. The electromagnetic clutch 56 (CLT2) is connected to the second original detection sensor 23.
When (SW2) does not detect the document, it is deenergized,
When the second document detection sensor 23 (SW2) detects the detection of a document, it is energized by the control means 100 described later.

The vacuum separating / feeding means 24 has a separating air ejecting means 62, which is a so-called air knife, which is arranged above the front end of the original table 12 in the original conveying direction. The separated air jetting means 62 is provided in the air chamber 621.
And a nozzle 622 for ejecting the air in the air chamber 621 toward the front end of the document set on the document table 12.
And an electric motor 62 including a blower 623 that supplies air to the air chamber 621 and a servomotor that drives the blower 623.
4 (M2). In the illustrated embodiment, the electric motor 624 (M2) is controlled by the control unit 100, which will be described later, based on the detection signal from the document stacking amount detection unit, which will be described later, that is, the stacking amount of the set document placed on the document table 12. The rotation speed is adjusted. That is, the rotation speed of the electric motor 624 (M2) is high when the set document amount is large, and the rotation speed of the electric motor 624 (M2) is low when the set document amount is small. . Therefore, since the blower 623 driven by the electric motor 624 (M2) has its rotation speed adjusted in accordance with the stacking amount of the original document, that is, the weight of the original document set on the original document table 12, the nozzle 6
The amount of air jetted from 22 is adjusted according to the weight of the original on the original table 12. When the air is ejected from the nozzle 622 of the separation air ejecting means 62 configured as described above, the air is blown between the respective originals placed on the original table 12 to perform a so-called separation action for separating the respective originals. Be seen.

A set original document stopper 63 is arranged at the original document setting position above the front end of the vacuum separating and feeding means 24 in the original document conveying direction, and a stock position upstream of the set original document stopper 63 in the original document conveying direction. A discharge document stopper 64 is provided in the. In the illustrated embodiment, the set original document stopper 63 and the ejected original document stopper 64 are arranged in the width direction of the original table 12 (see FIGS. 1 and 5).
Further, three pieces are arranged at intervals in the direction perpendicular to the paper surface in FIG. 6 and the left-right direction in FIG. These set original document stopper 63 and ejected original document stopper 64
Are movably supported in the vertical direction by support means 66 and 67 attached to the upper wall 65 made of synthetic resin attached to the upper ends of the side plates 11. The set document stopper 63 is made of a metal plate such as stainless steel, and has an elongated hole 631 in the middle thereof.
The upper end portion is bent to form an actuated portion 632. On the other hand, the supporting means 66 for supporting the set original document stopper 63 is a mounting boss 661 integrally formed by projecting downward on the upper wall 65 made of the synthetic resin, and the boss 66.
1 is provided with a support plate 663 made of a metal plate attached by screws 662. This support plate 663
Has a hole 664 at its center, and its lower end has guide portions 665, 6 with both sides bent at substantially right angles.
65 is formed. The set original document stopper 63 is supported by the support plate 663 configured as described above so as to be vertically movable. That is, the set document stopper 63
Is disposed between the guide portions 665 and 665 of the support plate 663, and the bolt 666 is inserted into the hole 664 provided in the support plate 663 and the long hole 631 provided in the set document stopper 63, and the nut 667 is attached to the bolt 666. Screw together. The set document stopper 63 supported by the support means 66 in this manner has its lower end abutted against the upper surface of the document table 12 (see FIG. 5) and its lower end retracted upward from the upper surface of the document table 12 by several mm. It is configured to be movable between the retracted position (see FIGS. 1 and 6).

Further, the discharge original stopper 64 is made of synthetic resin in the illustrated embodiment, an elongated hole 641 is provided in an intermediate portion thereof, and actuated projections 642 and 642 are provided on both sides of an upper end portion thereof. Is equipped with. on the other hand,
The supporting means 67 for supporting the discharged document stopper 64 is shown in FIG.
As shown in FIG. 7, a support member 671 integrally formed by projecting downward on the upper wall 65 made of the synthetic resin, and a guide member 67.
3 and 673. The support member 671 is provided with a guide protrusion 672 at the center of its lower end. The guide members 673 and 673 are respectively arranged at a predetermined distance (a distance slightly larger than the thickness of the discharged document stopper 64) from the support member 671 and at positions facing both side portions of the support member 671. . The support member 671 and the guide members 673 and 673 of the support means 67 configured as described above.
The ejected document stopper 64 is inserted between the ejected document stopper 64 and the supporting member 671 in the long hole 641 provided in the ejected document stopper 64.
The ejected document stopper 64 is supported by the support means 67 so as to be vertically movable by fitting the guide protrusion 672 provided on the. The ejected document stopper 64 supported by the support means 67 in this manner is in a regulation position where it comes into contact with the set document placed on the document table 12 (see FIGS. 1 and 6).
And a retracted position for retracting above the document table 12 (see FIG.
(See) and is configured to be movable between. The ejected document stopper 64 is positioned at a regulation position where it comes into contact with a set document placed on the document table 12,
When the set originals are fed and the set originals on the original table 12 decrease, the operation of the elongated holes 641 causes the originals to drop by its own weight following the decrease of the originals. Therefore, the discharged document stopper 64 also functions as a means for preventing the set document from floating. Further, since the three discharged document stoppers 64 are independently supported by the respective three supporting means 67, even when the set document is lifted, the respective discharged document stoppers 64 are always in contact with the lifted document. Therefore, it is possible to prevent the discharged document from slipping under the discharged document stopper 64.

Next, the stopper operating means 68 for positioning the set original document stopper 63 and the ejected original document stopper 64 at predetermined positions will be described with reference to FIG.
The stopper operating means 68 is an operating mechanism 680 and one solenoid 6 as a driving means for driving the operating mechanism 680.
It is equipped with 84 (SOL2). Stopper operating means 6
8 is an operation mechanism 680 for setting the set document stopper 6
3, an operating shaft 681 is provided on the downstream side of the document conveying direction and is rotatably supported by the both side plates 11. The operation shaft 681 is provided with three operation cams 682 at positions corresponding to the set document stopper 63, and three operation levers 683 are provided at positions corresponding to the discharge document stopper 64. There is. The three actuating cams 682 are arranged in contact with the lower surfaces of the actuated portions 632 of the three set original document stoppers 63, and are rotated by the rotation of the operating shaft 681 to move the set original document stoppers 63 to the stop position. And move to the retracted position. The three actuating levers 683 are made of a metal plate such as stainless steel, and have two actuating pieces 683a, 683a at one end thereof.
Are projectingly formed, and the other end is attached to the operating shaft 681 by screws 683b and 683b.
Two operating pieces 683a provided on the operating lever 683,
683a is configured such that its interval is slightly larger than the width dimension of the discharge original stopper 64, and the discharge original stopper 64 is positioned between both operating pieces to engage with the actuated projections 642 and 642 provided on the discharge original stopper 64. It is supposed to do. Therefore, the operating lever 683 is operated by the operating shaft 681.
Is rotated by the rotation to move the ejected document stopper 64 to the regulation position and the retracted position. One solenoid 68 as a driving means that constitutes the stopper actuating means 68
4 (SOL2), the plunger 684a has a pin 6 attached to a lever 685 attached to the rear end of the operating shaft 681.
They are connected by 86 and rotate the operating shaft 681 by a predetermined angle. The lever 685 attached to the operating shaft 681 has the other end of a return spring 687 whose one end is locked to a fixed part such as a side plate. In FIG. 9, it is urged to rotate in the direction indicated by arrow 681A. Therefore, the actuating shaft 681, the actuating cam 682 and the actuating lever 683 attached to the actuating shaft 681 are positioned in the state of FIG. 5 when the solenoid 684 (SOL2) is deenergized. That is, the operating cam 68
The second base circle is the operated portion 63 of the set original document stopper 63.
The set original document stopper 63 is positioned at the stop position by abutting the lower surface of 2, and the operating lever 683 is rotated upward to position the discharged original document stopper 64 at the retracted position. From the state of FIG. 5, the solenoid 684 (SOL
2) is urged, the actuating shaft 681 moves through the plunger 684a and the lever 685 and the arrow 681 in FIG.
It is rotated in the direction indicated by B, and therefore the operating shaft 681
The actuating cam 682 and the actuating lever 683 mounted on the are positioned in the states of FIGS. 1 and 6. That is, the cam portion of the operation cam 682 positions the set original document stopper 63 at the retracted position, the operation lever 683 rotates downward, and the ejected original document stopper 64 is positioned at the restricted position. Since the stopper operating means 68 for operating the set original document stopper and the ejected original document stopper is composed of one solenoid 684 (SOL2) and the operating mechanism 680, it can be manufactured at low cost.
Moreover, the actuating mechanism 680 includes the actuating shaft 681 and the actuating cam 68.
2 and the operating lever 683, the structure is compact and the document table 12 can be easily placed above.

The illustrated automatic document feeder 4 is equipped with a document stacking amount detecting means 69 for detecting the stacking amount of the set documents placed on the document table 12. The document stacking amount detection means 69 includes a detection member 691 and two detectors 690 (SW
3) and 692 (SW4). Detection member 69
Reference numeral 1 is made of synthetic resin, and an intermediate portion thereof is provided with a detection portion 691a which is formed so as to project toward the front side and is placed on the set original document on the original document table 12, and one end thereof projects toward the rear side. Formed detector 690 (SW
3) and a shielding portion 691b for shielding the light of 692 (SW4) are provided. In addition, an actuated projection 691c is provided in the middle of the detection member 691 so as to project inward and engage with an actuating lever described later. The detection member 691 configured as described above is rotatably supported at the other end by a short shaft 693 fixed to a side plate on the back side. In the illustrated embodiment, the detection unit 691a of the detection member 691.
Is configured to be positioned between the set original document stopper 63 and the discharged original document stopper 64 when placed on the set original document. Therefore, the document returned onto the set document after the set document is fed does not come into contact with the detection portion 691a of the detection member 691. The two detectors 690 (SW3) and 692 (SW4) are
As shown in FIGS. 5 and 6, each light emitting device 69
0a and 692a and light receiving elements 690b and 692b, which are arranged vertically and are attached to, for example, a side plate on the back side. These two detectors 690 (SW3) and 692 (S
W4) and the shielding portion 691b of the detection member 691 that moves between the two elements can detect the height position of the detection portion 691a, that is, the stacking amount of the set original document in four steps. That is, the first state in which the stacking amount of the set original is large and the shielding portion 691b is located above the two detectors 690 (SW3) and 692 (SW4), and the shielding portion 691b is the upper detector 6
The second state in which only 90 is shielded and the shield portion 691b is 2
The third state in which the individual detectors 690 (SW3) and 692 (SW4) are shielded, and the shield 691b is the lower detector 69.
It is possible to detect the fourth state in which only 2 (SW4) is shielded. Further, the stopper actuating means 68 engages with the actuated projection 691c of the detecting member 691 constituting the document stacking amount detecting means 69, and the detecting portion 691a of the detecting member 691.
Lever 694 for operating the detection position and the retracted position
Is provided. The actuating lever 694 is mounted on the actuating shaft 681 of the stopper actuating means 68, and the tip end portion thereof is engaged with the actuated projection 691c of the detecting member 691. That is, when the solenoid 684 (SOL2) is deenergized, as shown in FIG.
4, the detection member 691 is rotated upward to the retracted position, and the electromagnetic solenoid 684 (SO
When L2) is urged, the operating lever 694 rotates downward, so that the detection member 691 rotates downward by its own weight and the detection portion 691a is positioned at the detection position where it abuts against the set original.

Continuing the description with reference to FIG. 1, a pair of paper feed rollers 70 is provided downstream of the original table 15 in the original conveying direction.
Are arranged. The paper feed roller pair 70 is composed of a drive roller 701 and a driven roller 702. The drive roller 701 is power-transmitted and connected to the electric motor 60 (M1) via power transmission mechanisms 601 and 602, and is indicated by an arrow. It is driven to rotate. On the downstream side of the paper feed roller pair 70, an original carry-in path 72 for guiding the original fed by the paper feed roller pair 70 onto the transparent plate 8 is provided. A pair of registration rollers 74 is arranged in the original carry-in path 72. The registration roller pair 74 is composed of a driving roller 741 and a driven roller 742. The driving roller 741 is transmission-coupled to the electric motor 60 (M1) via a power transmission mechanism 601 and an electromagnetic clutch 75 (CLT3). There is. It should be noted that, on the upstream side of the registration roller pair 74 in the document carry-in path 72, a reflection type carry-in document detection sensor 720 (SW5) including a light emitting element and a light receiving element.
Are arranged. The incoming document detection sensor 720 (SW
5) detects a document passing through the document carry-in path 72 and sends the detection signal to the control means 100 described later.

A conveyor belt mechanism 7 is provided above the transparent plate 8.
6 are provided. The transport belt mechanism 76, which constitutes the document transport means, includes a drive roller 761 and a driven roller 762, which are arranged at intervals in the transport direction of the transparent plate 8, and an endless belt wound around the drive roller 761 and the driven roller 762. Belt 763, driving roller 761 and driven roller 7
62 and rolling rollers 764a, 764
b, 764c, 764d, 764e. The lower running portion of the endless belt 763 extends along the transparent plate 8 of the electrostatic copying machine 2, and a document transport path 78 is defined between the two. In the transport belt mechanism 76 configured as described above, the drive roller 761 as a transport motor is transmission-coupled to the electric motor 61 (M3) via the power transmission mechanism 611. The electric motor 61 (M3) is equipped with a rotation encoder 610 (FG2) such as a rotary encoder or a frequency generator that constitutes a document conveyance amount detector, and a pulse signal as a detection signal thereof will be described later. To the control means 100.

A document reversing means 80 is arranged on the right side of the document conveying path 78 in FIG. This document reversing means 8
0 has a reverse conveyance path 81 and a pair of conveyance rollers 82 and 83 arranged in the reverse conveyance path 81. The reverse conveyance path 81 is provided at the carry-in port 8 facing the document conveyance path 78.
11 to the exit 812 are curved and formed by a smooth curve, and the exit 812 is the original table 1 described above.
It is located a predetermined amount above 2. The conveying roller pairs 82 and 83 are drive rollers 821 and 8 respectively.
31 and driven rollers 822 and 822. These drive rollers 821 and 831 are driven by an electric motor 96 (M4), which will be described later, to transmit a power transmission mechanism 612,
It is driven to rotate in a direction indicated by an arrow via 622. A rotation amount detecting means 960 (FG3) such as a rotary encoder or a frequency generator which constitutes a document conveying amount detecting means is attached to the electric motor 96 (M4) (see FIG. 12), which is a detection signal thereof. The pulse signal is sent to the control means 100 described later.

A document discharging unit 85 is arranged downstream of the document reversing unit 80. Hereinafter, the document discharge means 85
This will be described with reference to FIGS. 10 to 17. The document discharge means 85 includes a discharge roller pair 86 and the discharge roller pair 8
6, a drive roller supporting means 87 for supporting the drive roller 861 constituting the No. 6, a document guide member 88 provided above the drive roller supporting means 87, and a cover member provided above the document guide member 88. Equipped with 89. The discharge roller pair 86 is configured such that the nip portion thereof is located at substantially the same height position as the carry-out port 812 of the reverse conveyance path 81. Drive roller 861 forming the discharge roller pair 86
Is composed of a rotary shaft 861a and a plurality of rollers 861b mounted on the rotary shaft 861a, and is rotatably supported by the drive roller supporting means 87.
The rear end of the rotary shaft 861a that constitutes the drive roller 861 is formed so as to project from the drive roller supporting means 87, and the drive pulley 861c is mounted on the projecting portion (see FIG. 11).

The drive roller supporting means 87 is provided with a supporting member 870 having a substantially rectangular cross section made of two thin steel plates in the illustrated embodiment. Support member 8
The upper portion 70 is configured so as to function as a guide portion 870a for the document to be discharged. A plurality of openings 870b are formed at the downstream end of the guide portion 870a in the drive roller supporting means 87, and the rollers 861b constituting the drive roller 861 are formed through the openings 870b.
Is arranged so that the outer peripheral surface of the is projected from the upper surface of the guide plate 870a. At both ends of the drive roller supporting means 87, as shown in FIG.
Brackets 871 and 871 each having an L-shaped cross section are attached as shown in FIG. This bracket 871, 871
Two support rollers 872 and 872 are attached to each of the support rollers 872 and 872.
1, horizontal support rails 111, 111
It is configured to be placed on (only one of the back sides is shown in FIG. 11). Therefore, the drive roller support means 87 can move in the document transport direction along the support rails 111, 111. As shown in FIG. 11, tension brackets 873 and 874 are mounted on the rear bracket 871 on both sides of a drive pulley 861c mounted on the rear end of a rotary shaft 861a that constitutes the drive roller 861. Has been done. Further, a connecting member 875 is attached to the bracket 871 on the front side as shown in FIG. The function of the connecting member 875 will be described later. The support member 870 is used.
In the guide portion 870a, a reflection type discharged original detection sensor 800 (SW6) including a light emitting element and a light receiving element is provided. The discharged document detection sensor 800 (SW6) detects a document discharged via the pair of discharge rollers 86,
The detection signal is sent to the control means 100 described later.

As shown in FIGS. 10 and 11, the original guide member 88 is a box-shaped main body member 880 made of synthetic resin, and a thin steel plate attached to the lower surface of the main body member 880 by an appropriate fixing means. It is provided with a guide member 881 that is bent and formed. The main body member 880 includes a main body portion 880a, a grip portion 880b provided at the front end of the main body portion 880a in the original conveyance direction, and a rear side portion 880c provided at the rear end of the main body portion 880a in the original conveyance direction. There is. The front side portion 880b of the body member 880 is the body portion 8
It is formed to project upward and downward from 80a,
A rod insertion hole 880d is formed at the lower rear end. In addition, the rear side portion 880c of the main body member 880 is
It is formed so as to project downward from 80a, and a rod insertion hole 880e is formed at the rear end portion thereof. The lower surface of the guide member 881 constitutes an upper guide portion 881a that forms a substantially horizontal document conveyance path from the downstream end of the reverse conveyance path 81 to the discharge roller pair 86 arranged in the document discharge section. . As shown in FIG. 11, connecting pins 883, 883 are attached to both ends of the guide member 881, respectively.
The connecting pins 883 and 883 are configured to fit into the fitting grooves 871a and 871a formed in the brackets 871 and 871 that form the drive roller supporting means 87. Therefore, the connecting pins 883 and 883 are fitted into the fitting groove 871.
a, 871a by fitting the document guide member 88
Can integrally move the drive roller support means 87 along the support rails 111, 111 in the document conveying direction. The guide member 8 that constitutes the document guide member 88
81, a plurality of driven rollers 862 forming the discharge roller pair 86 are arranged so as to face the plurality of rollers 861b forming the driving roller 861. The driven roller 862 has a rotating shaft 862a rotatably supported by a support bracket 884, and the support bracket 884 is attached to a mounting member 885 fixed to the guide member 881 by a screw 886. Is mounted on a roller support plate 887. Therefore, when the document guide member 88 is connected to the driving roller supporting means 87 as described above, the driven roller 862 is brought into pressure contact with the roller 861b forming the driving roller 861 by the spring force of the roller supporting plate 887. . The roller support plate 887 is arranged so as to pass through an opening 881b formed at the front end of the guide member 881.

The cover member 89 has a front end portion bent downward and provided with an engaging portion 891 at the tip thereof. The engaging portion 891 guides the original guide member 88. It is adapted to engage with the front lower surface of the member 881. In addition, a hole 892 for inserting a hand is provided in the front bent portion of the cover member 89. As shown in FIG. 11, brackets 892 and 893 are provided at the rear end of the cover member 89, and rod insertion holes 892 are provided in the brackets 892 and 893.
a and 893a are formed respectively. This bracket 8
Rod insertion holes 892a, 89 formed in 92, 893
3a and a grip portion 88 that constitutes the document guide member 88
0b and the rod insertion hole 8 formed in the rear side portion 880c.
The support guide rod 893 is inserted through 80d and 880e. The support guide rod 893 is provided on the inner side plate 1 on the back side.
It is inserted and fixed in rod insertion holes 112a and 113a formed in brackets 112 and 113 provided in No. 1. When the support guide rod 893 is inserted and assembled, the bracket 892 provided on the cover member 89 on the front side in the original document conveying direction is positioned rearward in the original document conveying direction with respect to the front side portion 880b forming the original document guiding member 88. The bracket 893 on the rear side in the conveying direction is the original guide member 88.
Is positioned on the rear side in the document conveying direction with respect to the rear side portion 880c. Therefore, from the state shown in FIG. 10, if the upper end of the grip portion 880b forming the document guide member 88 is held and pushed to the left, the document guide member 88 and the drive roller support means 87 are guided by the support guide rod 893 and are supported by the support guide rod 893. Rail 1
It is possible to move to the left along 11, 111. When the cover member 89 is lifted upward by inserting a hand into the hole 892 formed in the front bent portion of the cover member 89 from the state shown in FIG. 10, the cover member 89 rotates upward with the support guide rod 893 as the center. Can move. By the rotation of the cover member 89, the locking portion 891 provided at the front end of the cover member 89 engages with the front lower surface of the guide plate 881 constituting the document guide member 88, and the document guide member 88. Is also rotated upward around the support guide rod 893. In this way, by rotating the cover member 89 and the document guide member 88 upward about the support guide rod 893, the document discharge portion can be opened. Therefore, when a jam occurs in the document discharge portion. Can easily remove jammed documents.

Next, the drive means of the drive roller 861 forming the discharge roller pair 86 rotatably supported by the drive roller support means 87 will be described with reference to FIG. A drive pulley 861 mounted on the drive roller 861 is provided on the outer side of the side plate 11 on the back side which is a fixed portion.
A pair of transmission pulleys 91 and 92 are arranged outside the moving range of c in the transport direction. This transmission pulley 91 and 92
The endless timing belt 93 is wound around the drive pulley 861c mounted on the rotary shaft 861a of the drive roller 861. The tension pulleys 873 and 874 disposed on both sides of the drive pulley 861c are not shown in FIG.
As shown in FIG. 2, the upper surface of the timing belt 93 is pressed. The transmission pulley 91 is arranged laterally of the side plate 11 as a fixed portion via a transmission pulley 94 arranged coaxially with the transmission pulley 91 and a timing belt 95 wound around the transmission pulley 94. Further, it is transmission-coupled to the drive pulley 97 of the electric motor 96 (M4). Therefore, when the electric motor 96 (M4) is driven, its driving force is the driving pulley 97 timing belt 9
5, the transmission pulley 94, the transmission pulley 91, the timing belt 93, and the transmission pulley 92, the timing belt 93 is operated in the direction shown by the arrow in FIG.
The drive pulley 861c mounted on the rotary shaft 861a of the drive roller 861 is rotated in the direction indicated by the arrow. When a force is applied to move the drive roller support means 87 in the transport direction while the electric motor 96 (M4) is stopped, the drive pulley 861c and the tension pulley 8 are moved.
73 and 874 move along the timing belt 93 while rotating, and the drive roller supporting means 87 can be moved in the document conveying direction from the position shown in FIG. 10 to the range shown in FIG. As described above, in the driving unit of the driving roller 861 in the illustrated embodiment, the electric motor 96 (M4) serving as a driving source is disposed on the side of the side plate 11 serving as a fixed portion, and the document including the discharge roller pair 86 is provided. Since the discharge means 85 is not provided with the electric motor 96 (M4), the size of the document discharge means 85 can be made small and lightweight. In addition, since the electric motor 96 (M4) as a drive source does not move even if the drive roller support means 87 that supports the drive roller 861 of the discharge roller pair 86 is moved in the transport direction, the power source changes to the electric motor 96 (M4). Wiring is easy. Further, since the electric motor 96 as a drive source is disposed on the side of the side plate 11 as a fixed portion, the electric motor 96
(M4) can also be used as another device, for example, as a drive source for the pair of conveying rollers 82 and 83 of the document reversing means 80.

In the illustrated embodiment, the drive roller supporting means 87 is moved in the conveying direction as shown in FIG.
And as shown in FIG. 11, the document guide means 9 is provided in the document discharge portion.
00 is provided. The document guide means 900 includes a guide sheet 901 made of a flexible sheet member such as a resin film, a guide roller 902 for guiding the movement of the guide sheet 901, and a winding or sending-out of the guide sheet 901 as appropriate. Roller 903 and winding roller 9
03 for rotating the drive roller supporting means 87 in response to the movement of the drive roller supporting means 87 in the conveying direction. The guide sheet 901 has substantially the same size as the width direction of the document conveying path, and one end thereof is fixed to the upper surface of the guide portion 870a of the supporting member 870 constituting the driving roller supporting means 87 with an adhesive or the like. And
The other end is attached to the winding roller 903. The guide roller 902 has substantially the same length dimension as the width direction dimension of the guide sheet 901, and its rotation shaft 902.
a is rotatably supported by the side plates 11 and 11 as fixed parts. The winding roller 903 is also the guide roller 9
02 has substantially the same length dimension, and its rotating shaft 903.
a is rotatably supported by the side plates 11 and 11 as fixed parts.

The winding roller operating means 904 is shown in FIG.
As shown in FIG. 1, the rotary shaft 903 of the winding roller 903.
A roller drive pulley 905 having the same diameter as the take-up roller 903 mounted on the front end of a, and a side plate 11 disposed on the downstream side of the roller drive pulley 905 on the downstream side in the document transport direction and rotatably supported. The transmission pulley 906, the roller drive pulley 905, and the timing belt 907 wound around the transmission pulley 906. The timing belt 907 includes the drive roller support means 87.
The connecting member 875 attached to the bracket 871 attached to the front end of the is fixed by an appropriate fixing means. The roller driving pulley 905 and the transmission pulley 906 are arranged at a distance larger than the maximum moving length of the winding roller operating means 904. Since the take-up roller operating means 904 is configured as described above, when the drive roller supporting means 87 is moved to the downstream side in the document conveying direction, the timing belt 907 is also moved by the same amount as the moving amount. Therefore, the take-up roller 903 rotates corresponding to the amount of movement, and the guide sheet 901 is sent out by an amount corresponding to the amount of movement of the drive roller supporting means 87. On the other hand, when the drive roller supporting means 87 is moved to the upstream side in the document conveying direction, the timing belt 907 is also moved by the same amount as the moving amount, and the take-up roller 903 is rotated corresponding to the moving amount. The guide sheet 901 is wound up by an amount corresponding to the moving amount of the drive roller supporting means 87. In this way, the guide member 881 and the guide sheet 901 provide substantially horizontal space between the drive roller support means 87 and the downstream end of the reversing conveyance path 81 generated by the movement of the drive roller support means 87 in the conveyance direction. And a guide sheet 901 forms a lower guide portion thereof.

Below the drive roller supporting means 87, there is arranged an extruding plate 910 which is movable in the original conveying direction, that is, in the horizontal direction in FIG. Hereinafter, the push-out plate 910 and the push-out plate driving means 930 for operating the push-out plate 910 will be described with reference to FIGS. 14 to 17. The push-out plate 910 is made of a steel plate and has substantially the same width direction length as the drive roller supporting means 87. The height of the push plate 910 is such that H1 is larger than the maximum stacking height of documents placed on the document table 12, and the push plate 910 has a height.
The height H2 from the upper surface to the nip position of the discharge roller pair 86 is also configured to be larger than the maximum stacking height of the documents placed on the document table 12. At the upper end of the push-out plate 910, a flat surface portion 910a horizontally extending rearward in the document transport direction is provided.
Is bent, and the flat portion 910a functions so that the document is not pinched between the flat portion 910a and the front wall of the supporting member 870 that constitutes the driving roller supporting means 87. Push plate 9
Two connecting pieces 911, 911 bent and formed on the back side are provided in the central portion of 10. This connecting piece 91
Actuating plates 912 are attached to the first and the first terminals 911 by screws 913 and 913, respectively. The operation plate 912 is provided with a pin fitting groove 912a formed long in the width direction. In addition, the supported portions 912b, 91 are provided on both sides of the operating plate 912.
2b are provided, and the supported portions 912b and 912 are provided.
b is a supporting member 8 which constitutes the driving roller supporting means 87.
The guide supporting members 920 and 920 mounted on the mounting member 70 are mounted on the supporting portions 920a and 920a. The guide support members 920 and 920 are provided with guide grooves 920b and 920b, and both ends of the supported portions 912b and 912b are fitted into the guide grooves 920b and 920b and move while being guided in the transport direction. It is possible.

The push-out plate driving means 930 is provided with an electric motor 931 (M5) as a driving source which is arranged on the inner side of the supporting member 870 which constitutes the driving roller supporting means 87. The electric motor 931 (M5) is the support member 8 described above.
It is attached to a bracket 932 attached to 70. A worm 933 is attached to the drive shaft 931a of the electric motor 931 (M5), and the worm 933 meshes with the worm gear 934. Worm gear 9
The transmission gear 935 is vertically integrated with the transmission gear 935. The worm gear 934 and the transmission gear 935 are attached to the support member 870 and rotatably attached to the support shaft 936. The transmission gear 935 is the drive pulley 9
37 and the upper and lower parts integrally formed with 37 and meshes with the transmission gear 938. The drive pulley 937 and the transmission gear 938 are rotatably mounted on a support shaft 939 attached to a support plate 940 fixed to the support member 870. The supporting member 870 which constitutes the driving roller supporting means 87 includes
A driven pulley 941 is arranged on the front side portion thereof. The driven pulley 941 includes a support member 870 and a support plate 94.
It is rotatably attached to the support shaft 942 attached to the No. 0. At the lower end of the driven pulley 941, the driven pulley 94
A detection board 943 for detecting the rotation position of 1, that is, the operating position of the pushing plate 910 is integrally provided. A notch 943a is formed on a part of the outer circumference of the detection board 943. First and second detectors 944 (SW7) and 945 (SW8) are arranged to face the outer circumference of the detection board 943 with a phase angle of 180 degrees. First and second detectors 944 (SW7) and 945 (SW8)
Is a well-known optical detector each of which includes a light emitting element and a light receiving element. The first and second pin actuating pulleys 946 and 9 are provided at the central portion of the support plate 940 fixed to the support member 870 which constitutes the drive roller support means 87.
47 are provided. The first and second pin actuating pulleys 946 and 947 are rotatably mounted on support shafts 948 and 949 mounted on the support plate 940. Operating pins 950 and 951 are mounted on the first and second pin operating pulleys 946 and 947, respectively. The operating pins 950 and 951 are fitted in the pin fitting grooves 912a formed in the operating plate 912. It A tension pulley 952 is arranged between the first pin operating pulley 946 and the second pin operating pulley 947. The tension pulley 952 is rotatably attached to a support shaft 953 attached to the support plate 940. The drive pulley 937, the driven pulley 94
First, first and second pin actuation pulleys 946 and 94
A timing belt 954 is wound around 7. The tension pulley 952 is configured to press the timing belt 954 between the first pin operating pulley 946 and the second pin operating pulley 947. The drive pulley 937 and the driven pulley 94
First, first and second pin actuation pulleys 946 and 94
The diameters of 7 are the same in the illustrated embodiment.

When the electric motor 931 (M5) is rotationally driven from the retracted position shown by the solid line in FIGS. 15 and 16, the pushing plate driving means 930 configured as described above has a driving force of the worm 933 and the worm gear. 93
4, the transmission gear 935 and the transmission gear 938 are transmitted to the drive pulley 937, and the drive pulley 937 is rotated in the direction shown by the arrow in FIG. Drive pulley 9
When 37 rotates in the direction indicated by the arrow in FIG. 16, the timing belt 954 operates in the direction indicated by the arrow in FIG. 16, and the driven pulley 941, the first and second pin actuating pulleys 946 and 947 are indicated by the arrow in FIG. Rotate in the direction shown. Therefore, the operating pin 95 mounted on the first and second pin operating pulleys 946 and 947 is
Due to the action of 0 and 951, the operating plate 912 is pushed out to the downstream side in the document conveying direction, and therefore the pushing plate 910 mounted with the operating plate 912 is operated to the downstream side in the document conveying direction. Then, the first and second pin operating pulleys 9
When 46 and 947 are rotated 180 degrees from the state shown by the solid line in FIG.
It is located at the extrusion position indicated by the dotted line. At this time, the electric motor 931 (M5) is stopped based on the detection signal from the first detector 944 (SW7). That is, in the state shown in FIG. 16, the first and second detectors 944 (SW7) and 945 (SW8) are both blocked by the detection board 943 and turned off, and the detection board 943 is in the state shown in FIG. When the first detector 944 (SW7) is rotated in the direction indicated by the arrow from the notch 94
Since 3a passes and is turned on once and rotated 180 degrees, the end portion blocking the second detector 945 (SW8) in FIG. 16 has the first detector 944 (SW) as shown in FIG.
Since 7) is blocked and turned off, this first detector 944
The control means (not shown) stops the electric motor 931 (M5) based on the signal that (SW7) is turned on and then turned off.

When the pushing plate 910 is returned from the pushing position shown by the chain double-dashed line to the retracted position shown by the solid line in the figure, it operates as follows. That is, the electric motor 931 (M
When 5) is rotationally driven, as described above, the first and second
16 are rotated in the directions indicated by the arrows in FIG. 16, and the operation plates 912 and 951 attached to the first and second pin operation pulleys 946 and 947 cause the operation plate 912 to move to the original. It is pushed back to the upstream side in the transport direction. Therefore, the operating plate 912
The push-out plate 910 mounted with is operated to the downstream side in the document conveying direction. When the first and second pin actuating pulleys 946 and 947 rotate 180 degrees, the push plate 910 is positioned at the retracted position shown by the solid line in the figure. At this time, the second detector 944 (SW7)
The electric motor 931 (M5) is stopped based on the detection signal from. That is, in the state shown in FIG. 17, the first and second detectors 944 (SW7) and 945 (SW
8) is turned off by being blocked by the detection board 943, and when the detection board 943 rotates in the direction indicated by the arrow from the state shown in FIG. 17, the second detector 945 (SW8) has the cutout portion 943a. When passing through and turning 180 degrees to pass, the first detector 944 (SW
Since the end portion that intercepts 7) intercepts the second detector 945 (SW8) and turns off as shown in FIG.
The control means (not shown) controls the electric motor 931 based on a signal that turns off the detector 945 (SW8) after turning on.
Stop (M5). The amount of movement of the pushing plate 910, which is operated as described above, in the transport direction is set to an amount corresponding to the distance between the set original document stopper 63 and the discharged original document stopper 64.

Next, the control means 100 will be described with reference to FIG. The control means 100 is composed of a microcomputer, and a central processing unit (CPU) 101 that performs arithmetic processing according to a control program and a read-on memory (ROM) 102 that stores the control program.
And a readable / writable random access memory (RAM) 103 for storing calculation results and the like, a timer 104, a counter 105, an input interface 106 and an output interface 107. The input interface 106 of the control means 100 thus configured
Includes the first document detection sensor 21 (SW1) and the second document detection sensor 21 (SW1).
Document detection sensor 23 (SW2), detectors 690 (SW3) and 692 (SW) of the document stacking amount detection means 69.
4), input document detection sensor 720 (SW5), output document detection sensor 800 (SW6), first detector 944 (S
W7), second detector 945 (SW8), rotation amount detection means 600 (FG1), 610 (FG2), 960 (FG
3) etc., the detection signals are input, and the electric motors 60 (M1) and 624 (M) are output from the output interface 107.
2), 61 (M3), 96 (M4), 931 (M5),
Electromagnetic clutch 35 (CLT1), 56 (CLT2), 7
5 (CLT3), solenoid 468 (SOL1), 68
4 (SOL2) or the like to output a control signal. Further, the control means 100 is connected to the control means 200 of the electrostatic copying machine 2, and control signals are exchanged between them. The control means 200 of the electrostatic copying machine 2 includes the operation means 20.
1 and the display means 202 are connected. Operation means 2
Reference numeral 01 is arranged on the upper surface of the front part of the electrostatic copying machine 2 as shown in FIG. Then, the copy information is input to the control means 200 of the electrostatic copying machine 2. The display means 202 is arranged adjacent to the operation means 201 on the upper surface of the front part of the electrostatic copying machine 2 like the operation means 201, and displays copy information, failure information and the like.

The automatic document feeder according to the illustrated embodiment is configured as described above, and its operation will be described below. First, the case of using a document having a small width dimension such as A4 or B5 size will be described. When setting a document on the document table 12, the electromagnetic solenoid 684 (SOL2) of the stopper actuating means 68 is deenergized. Therefore, the set original document stopper 63 and the ejected original document stopper 64 are in the state shown in FIG. 5, that is, the set original document stopper 63 is located at the stop position and the ejected original document stopper 64 is located at the retracted position. Further, the detection member 691 of the document stack amount detection means 69 is also positioned at the retracted position. In this state, the original is brought into contact with the set original stopper 63 whose front end is in the stop position and placed on the original table 12, and the width regulating member 20 is moved upward in FIG. 2 to regulate the inner surface of the side plate 22 and the width. The position of the document in the width direction is regulated by the inner surface of the member 20. Next, the grip portion 880b of the document guide member 88 moves the drive roller support means 87 from the state shown in FIGS. 1 and 10 to the position corresponding to the size of the document placed on the document table 12 on the downstream side in the document transport direction. . The original table 12
On the upper surface of, the positioning position of the push-out plate 910 attached to the drive roller supporting means 87 is designated in correspondence with each document size. The position of the push-out plate 910 corresponds to the rear end position of the document when the document is discharged to the document table 12 with the discharged document stopper 64 positioned at the regulation position. When a document having a small width dimension is set on the document table 12 as described above, the position of the front edge of the document, that is, the lower edge in FIG. 2, does not reach the second opening 16. . In this way, when a document is set on the document table 12, the first document detection sensor 21 (SW1) detects that the document is set on the document table 12, and the detection signal is not shown. Send to control means. In this state, when a copy start switch (not shown) is turned on, the electric motor 931 (M5) of the push-out plate driving means 930 is rotationally driven by the control means 100, and the push-out plate 910 is indicated by a chain double-dashed line in FIGS. 1 and 10. It is located in the extrusion position shown. Therefore, the document placed on the document table 12 is pushed out to the set position where the front end thereof contacts the set document stopper 63. In this way, if the document placed on the document table 12 is moved to the set position,
The solenoid 684 (SOL2) of the stopper actuating means 68 is urged by the control means (not shown) so that the set original document stopper 63 and the discharged original document stopper 64 are in the state shown in FIGS. 1 and 5, that is, the set original document stopper 63 is in the retracted position. The ejected document stopper 64 is positioned at the regulation position. Further, the document stack amount detection means 6
The nine detection members 691 are positioned at the detection position. Then, the copying operation is started by the control means 100, the suction blower 36 is driven, and the air in the vacuum chamber 26 is sucked. Therefore, the lowest document among the documents placed on the document table 12 is attracted to the feeding belt 32 of the vacuum separating and feeding means 24. At this time, the electric motor 624 (M2) of the separated air ejection means 62
Is driven to operate the blower 623, and air is ejected from the nozzle 622 toward the front end placed on the original table 20. Therefore, air is blown between the originals placed on the original table 20, Each document is separated and the lowest document is separated and attracted to the feeding belt 32. At this time, the rear end of the document placed on the document table 20 is in contact with the push-out plate 910 positioned at the push-out position, so the nozzle 622 of the separation air jetting means 62 is in contact.
Documents are not blown by the air blown from. On the other hand, when the copy start switch is turned on, the drive roller 28 is rotationally driven by the drive mechanism (not shown) via the roller drive gear 39 in the direction indicated by the arrow. As the drive roller 28 rotates, the feed belt 32 is actuated in the direction indicated by the arrow, and thus the feed belt 32 as described above.
The lowest document adsorbed on the sheet is fed downstream in the transport direction. When a document having a small width is used, the second document detection sensor 23 (SW2) does not detect the document, and therefore the solenoid 468 (SOL1) is in the deenergized state. Is closed, the communication between the vacuum chamber 26 and the feeding drum 40 is cut off. In addition, the second document detection sensor 23 (SW2)
Does not detect the document, the electromagnetic clutch 56 (CLT
Since 2) is also deenergized, the feeding drum 40 is also stopped.

The original fed by the vacuum separating / feeding means 24 as described above is conveyed to the original carry-in path 72 by the pair of paper feed rollers 70, and the front end of the original is detected by the carried-in original detecting sensor 720 (SW5). After a lapse of a predetermined time from when the electric motor 60 (M1) is turned off, the electromagnetic clutch 75 (CLT3) is deenergized and brought into contact with the nip portion of the registration roller pair 74 which is in the inoperative state. Then, the primary paper feeding is completed. Next, when the electric motor 60 (M1) is turned on again and the electromagnetic clutch 75 (CLT3) is energized to activate the registration roller pair 74, the original document fed to the nip portion is the electrostatic copying machine 2 The document is conveyed toward a document conveying path 78 extending along the transparent plate 8. Further, the electric motor 61 (M3) is driven, and the conveyor belt mechanism 76, which constitutes a conveyor means, conveys the transparent plate 8 from the left side to the right side in FIG. The paper is finished. The exposure operation is executed in this state.

When the exposure operation of the original positioned on the transparent plate 8 is completed as described above. The electric motor 61 (M3) is driven again and the electric motor 96
(M4) is driven. Therefore, the transport belt mechanism 76 is operated to transport the document on the transparent plate 8 toward the reverse transport path 81 of the document inverting means 80. The document conveyed to the reverse conveyance path 81 is conveyed by a pair of conveyance rollers 82 and 83.
Is conveyed toward the discharge roller pair 86, and is discharged from the discharge roller pair 86 onto the set original document placed on the original document table 12. The original conveyed by the conveying roller pair 83 toward the discharge roller pair 86 is guided by the guide portion 881a of the guide member 881 constituting the document guide member 88 on the upper side and the document guide means 900 on the lower side.
Is guided by the guide sheet 901. As described above, the front end of the original conveyed on the original set on the original table 12 is brought into contact with the discharged original stopper 64 arranged at the stock position to distinguish it from the original set first. To be done. Further, the rear end portion of the document discharged onto the document table 12 is supported on the pushing plate 910 positioned at the position indicated by the chain double-dashed line in FIG. As described above, all the set originals placed on the original table 12 are fed, and the original table 12 is exposed after the exposure operation.
When it is returned to the upper position, the electromagnetic solenoid 684 (SOL2) of the stopper operating means 68 is deenergized by the control means 100, and the set original document stopper 63 and the discharged original document stopper 6 are released.
4 and the detection member 691 of the document load amount detecting means 69, that is, the set document stopper 63 is positioned at the stop position, the discharged document stopper 64 is positioned at the retreat position, and the document load amount detecting means is detected. The detection member 691 of 69 is positioned at the retracted position.
On the other hand, the control means 100 controls the push-out plate driving means 93.
No. 0 electric motor 931 (M5) is rotationally driven, and the pushing plate 910 is positioned at the retracted position shown by the solid line in FIGS. 1 and 10. By moving the push-out plate 910 to the retracted position shown by the solid line, the rear end of the document discharged onto the document table 12 and supported on the push-out plate 910 is dropped onto the document table 12. When the original discharged on the original table 12 is copied again, the pushing plate 910 is moved to the pushing position shown by the chain double-dashed line in FIGS. 1 and 10 as described above. The original returned to 12 is pushed to the left in the figure by the push-out plate 910, and its front end is brought into contact with the set original stopper 63 to be set again.

Next, the case of using a document having a large widthwise dimension such as A3 or B4 size will be described. When setting an original on the original table 12, the electromagnetic solenoid 684 (SOL2) of the stopper operating means 68 is deenergized, and the set original stopper 63, the discharged original stopper 64, and the detection member of the original stack amount detecting means 69. The state 691 is shown in FIG. 5, that is, the set document stopper 63 is positioned at the stop position, the discharged document stopper 64 is positioned at the retracted position, and the detection member 691 of the document stack amount detecting means 69 is also retracted. It is positioned. In this state, the width regulating member 20 is moved to the front side of the second opening 16, that is, downward in FIG. 2, so that the document to be copied is placed on the document table 12 and the width regulating member 20 is moved.
2 is moved to the upper side in FIG. 2, and the position of the document in the width direction is regulated by the inner surface of the side plate 22 and the inner surface of the width regulating member 20. In this way, when a document having a large widthwise dimension is set on the document table 12 as described above, the document is placed over the first opening 14 and the second opening 16. In this way, when the document is set on the document table 12, the first document detection sensor 21 (SW1)
The second document detection sensor 23 (SW2) detects that the document is set on the document table 12, and sends the detection signal to the control means 100. Next, the driving roller support means 87 is held by the grip portion 880b of the document guide member 88.
1 is moved downstream from the state shown in FIGS. 1 and 10 to a position corresponding to the size of the original placed on the original table 12. If the original placed on the original table 12 is of B4 size, the original guide member and the drive roller supporting means 87 are moved to a predetermined position to make the original A.
In the case of 3 sizes, the state shown in FIGS. 1 and 10 may be used. In this state, when a copy start switch (not shown) is turned on, the control means 100 causes the pushing plate drive means 930.
The electric motor 931 (M5) is driven to rotate, and the push-out plate 910 is positioned at the push-out position indicated by the chain double-dashed line in FIGS. 1 and 10. Therefore, the manuscript table 1
The document placed on the sheet 2 is pushed out to the set position where the front end of the document touches the set document stopper 63. In this way, if the document placed on the document table 12 is to be moved to the set position, the solenoid 684 (SOL) of the stopper operating means 68 is controlled by the control means (not shown).
2) is urged so that the set original document stopper 63 and the discharged original document stopper 64 are in the state shown in FIGS. 1 and 5, that is, the set original document stopper 63 is positioned at the retracted position,
The discharged document stopper 64 is positioned at the above-mentioned regulation position, and the detection member 691 of the document stacking amount detection means 69 is positioned at the detection position. Then, the copying operation is started by the control means 100, the suction blower 36 is driven, and the air in the vacuum chamber 26 is sucked. Therefore, the lowest document among the documents placed on the document table 12 is the feeding belt 3 of the vacuum separating and feeding means 24.
Adsorbed to 2. At this time, the separated air jetting means 6
The second electric motor 624 (M2) is driven and the blower 62 is
3 is operated and air is ejected from the nozzle 622 toward the front end placed on the original table 20, so that air is blown between the originals placed on the original table 20,
Each document is separated and the lowest document is separated. On the other hand, when the copy start switch is turned on, the drive roller 28 is rotationally driven by the drive mechanism (not shown) via the roller drive gear 39 in the direction indicated by the arrow. When the drive roller 28 rotates, the feeding belt 32 is operated in the direction indicated by the arrow. When the second document detection sensor 23 detects a document, the electromagnetic clutch 56 (CLT2) is energized, so that the feeding drum 40 is rotated. Therefore,
As described above, the lowest document adhering to the feeding belt 32 and the feeding drum 40 is fed to the downstream side in the conveying direction. In this way, when a document having a large width dimension is placed on the document table 12, that is, when the second document detection sensor 23 (SW2) detects the document, the vacuum separating and feeding means 24 side is provided. The feeding drum 40 disposed on one side is operated, and the lowermost original is fed while being sucked over the entire width direction by the vacuum separating and feeding means 24 and the feeding drum 40. Is reliably prevented. In the illustrated embodiment, the solenoid 468 is used when a document having a small width dimension is placed on the document table 12, that is, when the second document detection sensor 23 (SW2) does not detect the document. (SOL
Since 1) is deenergized and the opening / closing valve 46 is closed,
Vacuum chamber 26 of vacuum separating and feeding means 24
The degree of vacuum inside does not decrease. In the illustrated embodiment, when the second document detection sensor 23 (SW2) does not detect the document, the electromagnetic clutch 56 (C
Since LT2) is deenergized and the feeding drum 40 stops, the feeding drum 40 does not rotate without a document above it, so that safety can be ensured.

As described above, the original set on the original table 12 is conveyed onto the transparent plate 8 and subjected to the exposure processing, and thereafter, the original reversing means 80 and the original discharging means 8 are provided.
5 returns the document table 12 to the stock position. When the original discharged on the original table 12 is to be copied again, the pushing plate 910 is moved to the pushing position shown by the chain double-dashed line in FIGS. 1 and 10 as described above, whereby the original table is moved. 12
The original returned to the stock position is pushed to the left in the figure by the push-out plate 910, and its front end is brought into contact with the set original stopper 63 to be set again. At this time, since the vacuum separating and feeding means 24 is stopped, the front end of the document is caught by the feeding belt 32 made of a rubber material, which may cause the document to be broken or jam. In order to solve such a problem, the automatic document feeder according to the illustrated embodiment is operated as shown in the flowcharts of FIGS. 19 and 20. Less than,
The operation procedure of the control means 100 provided in the automatic document feeder will be described with reference to the flowcharts of FIGS. 19 and 20.

The control means 100 checks whether or not the first document detection sensor 21 (SW1) is ON, that is, whether or not a document is set on the document table 12 (step S1). If a document is set on the document table 12, the process proceeds to step S2 to check whether or not a copy start signal is sent from the control means 200 of the electrostatic copying machine 2. The operator sends the copy start signal to the operation means 20.
By inputting a copy start signal with the copy start key No. 1, the control means 200 sends it to the control means 100.
If the copy start signal is sent in step S2, the process proceeds to step S3, and the control means 100 urges the solenoid 684 (SOL2) of the stopper operating means 68 to move the set original document stopper 63 and the discharged original document stopper 64 to the state shown in FIG. Position it in the state shown in. Next, the control means 100
Advances to step S4 to rotationally drive the electric motor 931 (M5) of the pushing plate driving means 930, and step S5
Then, it is checked whether or not the first detector 944 (SW7) is once turned on and then turned off. As a result of this check, unless the first detector 944 (SW7) is once turned on and then turned off, the pushing plate 910 has not reached the predetermined pushing position, so the first detector 944 is waited for.
If (SW7) is once turned on and then turned off, it is determined that the pushing plate 910 has reached a predetermined pushing position, and the process proceeds to step S6 to stop the electric motor 931 (M5). Then, the control means 100 causes the step P0.
Then, the subroutine for the primary paper feeding operation for conveying the lowest document set on the document table 12 to the registration roller pair 74 is executed, and then the process proceeds to step Q0 to feed the nip portion of the registration roller pair 74. The subroutine for the secondary paper feeding operation for positioning the fed original at a predetermined position on the transparent plate 8 of the electrostatic copying machine 2 is executed.

Next, the control means 100 proceeds to step S7 to check whether or not the document exchange signal is sent from the control means 200 of the electrostatic copying machine 2. This document exchange signal is
When the exposure of the original document conveyed on the transparent plate 8 is completed, it is sent from the control means 200 of the electrostatic copying machine 2 to the control means 100. If there is no original exchange signal in step S7, the exposure operation of the original conveyed on the transparent plate 8 is not completed yet, and the process waits. If there is an original exchange signal, step S7 is performed.
8 and move to electric motors 61 (M3) and 96 (M
4) is driven to operate the conveyance belt mechanism 76 and the document reversing means 80 which constitute the document conveying means, and the conveyance roller pair 82 and 843 discharge roller pair 86 which constitute the document discharging means 85. As a result, the original document that has been conveyed onto the transparent plate 8 and has been subjected to the exposure process is conveyed through the original document inversion path 81. The control means 100 determines the electric motor 61 (M3) in step S8.
And 96 (M4) are drive-controlled, step S
9, the discharged document detection sensor 800 (SW6) is turned on.
Then, it is checked whether or not the front end of the discharged document has reached the position of the discharged document detection sensor 800 (SW6). In step S9, the discharged document detection sensor 8
If 00 (SW6) is not turned on, the front end of the original has not reached the discharged original detection sensor 800 (SW6), so wait, and if the discharged original detection sensor 800 (SW6) is turned on, the front end of the original is the discharged original detection sensor 800. (SW6)
When the control means 100 determines that the position has reached the position, the control means 100 proceeds to step S10 to start counting the pulse signal (PS) from the rotation amount detection means 960 (FG3) attached to the electric motor 96 (M4). . And the control means 10
0 proceeds to step S11, and the rotation amount detection means 960
Count value (P) of pulse signal (PS) from (FG3)
It is checked whether or not (SN) has reached the set value (N1). The set value (N1) is set to the number of pulse signals corresponding to the carry amount from when the front end of the document reaches the position of the discharged document detection sensor 800 (SW6) to when it reaches the document table 12. If the count value (PSN) of the pulse signal (PS) does not reach the set value (N1) in step S11, the control waits, and if the count value (PSN) of the pulse signal (PS) reaches the set value (N1), control is performed. Means 1
00 proceeds to step S12 to check whether the first document detection sensor 21 (SW1) is OFF, that is, whether the document set on the document table 12 is exhausted. In step S12, the first document detection sensor 21 (SW1) is not turned off and the document table 1
If there is a set original on the second page, then the above step P
The process proceeds to 0 and the primary paper feed is executed. If the first document detection sensor 21 (SW1) is OFF in step S12, it is determined that all the documents set on the document table 12 have been fed, exposed, and discharged.
The control means 100 proceeds to step S13 and proceeds to the electric motor 6
Stop 1 (M3) and 96 (M4). Then, the control means 100 proceeds to step S14 to check whether or not the copying operation for the set number of copies is completed. As a result of the check, if the copy operation for the set number of copies is completed, the operation is ended. If the copy operation for the set number of copies is not completed, the processing proceeds to step S15.

The control means 100 controls the electric motor 931 (M of the pushing plate driving means 930 in step S15).
5) is rotationally driven, and the process further proceeds to step S16 to check whether the second detector 945 (SW8) is once turned on and then turned off. As a result of this check, unless the second detector 945 (SW8) is once turned on and then turned off, the pushing plate 910 has not reached the retracted position, so wait, and the second detector 945 (SW8) is turned on once. If it is turned off after that, it is determined that the pushing plate 910 has reached the retracted position, and the process proceeds to step S17 to stop the electric motor 931 (M5). In this way, the push-out plate 910 is positioned at the retracted position, so that the rear end portion of the document discharged onto the document table 12 and supported on the push-out plate 910 is dropped onto the document table 12. Next, the control means 100 performs step S18.
To the solenoid 684 of the stopper operating means 68.
(SOL2) is deenergized to set the set original document stopper 63 and the discharged original document stopper 64 in the state shown in FIG.
Then, the control means 100 proceeds to step S19 to drive the electric motor 931 (M5) and the electric motor 60 (M1) of the push-out plate driving means 930 and to energize the electromagnetic clutch 35 (CLT1). Therefore, the push-out plate 910 is pushed out to move the original document to the original document setting position, and at the same time, the vacuum separating / feeding means 24 is moved.
The feeding belt 32 of is activated. Therefore, the front end of the document moved to the document setting position does not get caught on the feeding belt 32. At this time, the pushing plate 91
0 so that the moving speed of the original and the moving speed of the feeding belt 32 are the same or substantially the same.
5) and it is desirable to control the rotation speed of the electric motor 60 (M1). In step S19, if the electric motor 931 (M5) and the electric motor 60 (M1) of the pushing plate driving means 930 are driven and the electromagnetic clutch 35 (CLT1) is energized, the control means 1
00 proceeds to step S20 and the first detector 944 (S
It is checked whether W7) is turned on and then turned off. As a result of this check, the first detector 944 (SW
If 7) is turned on once and then not turned off, push plate 9
Wait because 10 has not reached the prescribed push position,
After the first detector 944 (SW7) is turned on once, it becomes OF
If F, it is determined that the push-out plate 910 has reached the predetermined push-out position, the process proceeds to step S21, the electric motor 931 (M5) and the electric motor 60 (M1) are stopped, and the electromagnetic clutch 35 (CLT1). De-energize. Then, the control means 100 shifts to the step P0 and executes the steps P0 to S21 until the copying of the set number of copies is completed.

[0043]

Since the automatic document feeder according to the present invention is constructed as described above, it has the following effects.

That is, according to the present invention, in order to push out the document discharged on the document table mounted on the document discharging means to a predetermined pushing position, when the pushing plate driving means is driven to push the pushing plate to the pushing position. Further, since the feeding motor is driven to operate the feeding belt of the vacuum separating and feeding means, the lowest document of the documents pushed out by the pushing plate is not caught on the feeding belt.

Further, according to the present invention, the control means drives and controls the feeding motor and the pushing plate driving means so that the moving speed of the feeding belt and the pushing speed of the pushing plate are substantially the same. Therefore, it is possible to reliably prevent the lowest document of the documents pushed out by the pushing plate from being caught by the feeding belt.

[Brief description of drawings]

FIG. 1 is a sectional view of an automatic document feeder constructed according to the present invention.

FIG. 2 is a plan view of a main part of the vacuum document separating and feeding means provided in the automatic document feeder shown in FIG.

FIG. 3 is a cross-sectional view taken along line AA of the vacuum separating and feeding unit shown in FIG.

FIG. 4 is a cross-sectional view taken along line BB of the vacuum separating and feeding means shown in FIG.

5 is an enlarged cross-sectional view of essential parts showing a state when a document is set in the automatic document feeder shown in FIG.

FIG. 6 is an enlarged cross-sectional view of essential parts showing a document transport state of the automatic document transport device shown in FIG. 1.

7 is a front view of relevant parts showing a relationship between a set original document stopper, a discharged original document stopper, and a stopper operating means which are provided in the automatic original document feeder shown in FIG.

FIG. 8 is a sectional view taken along line CC in FIG.

9 is a perspective view of essential parts of a stopper actuating means and a document stacking amount detecting means provided in the automatic document feeder shown in FIG.

FIG. 10 is an enlarged cross-sectional view of a document reversing unit and a document discharging unit in the automatic document feeder shown in FIG.

FIG. 11 is an exploded perspective view of a document reversing unit and a document discharging unit of the automatic document feeder shown in FIG.

12 is a perspective view showing a driving unit of a discharge roller arranged in a document discharging unit of the automatic document feeder shown in FIG.

13 is a cross-sectional view of essential parts showing a state in which a document discharging unit of the automatic document feeder shown in FIG. 1 is moved in a document feeding direction.

14 is a cross-sectional view of a push-out plate driving means that operates a push-out plate provided in the automatic document feeder shown in FIG.

FIG. 15 is a sectional view taken along line DD in FIG.

16 is a plan view of an essential part of the push-out plate driving means shown in FIG.

FIG. 17 is a plan view of a detection board and a detector for detecting the operating position of the pushing plate equipped in the pushing plate driving means shown in FIG.

FIG. 18 is a block diagram showing the configuration of control means provided in the automatic document feeder shown in FIG. 1.

19 is a partial flowchart showing a processing procedure of the control means shown in FIG.

FIG. 20 is a partial flowchart showing a processing procedure of the control means shown in FIG.

FIG. 21 is a partial flowchart showing the processing procedure of the control means shown in FIG.

[Explanation of symbols]

 2: Electrostatic copying machine 4: Automatic document feeder 6: Electrostatic copying machine housing 8: Transparent plate 10: Document control member 11: Side plate 111: Support rail side plate 12: Document table 20: Width control member 21: First Document detection sensor (SW1) 23: second document detection sensor (SW2) 24: vacuum separating and feeding means 35: electromagnetic clutch (CLT1) 56: electromagnetic clutch (CLT2) 60: electric motor (M1) as paper feeding motor ) 600: Rotation amount detection means (FG1) 61: Electric motor (M3) as a conveyance motor 610: Rotation amount detection means (FG2) 62: Separated air ejection means 624: Servo motor 63: Set original document stopper 64: Ejected original document stopper 468: Solenoid (SOL1) 684: Solenoid (SOL2) 69: Document stacking amount detection means 691: Detection member 690: Detector (SW3) 692: Detector (SW4) 70: Paper feed roller pair 72: Document feeding path 720: Carrying document detection sensor (SW5) 74: Registration roller pair 76: Conveying belt mechanism 78: Document conveying path 80 : Document Reversing Unit 800: Ejected Document Detection Sensor (SW6) 81: Reversed Conveying Path 82: Conveying Roller Pair 83: Conveying Roller Pair 85: Document Discharging Unit 86: Discharging Roller 96: Electric Motor as Discharging Motor 960: Rotation Detecting means (FG3) 97: Drive pulley 900: Document guiding means 910: Extruding plate 912: Actuating plate 912a: Pin fitting groove 930: Extruding plate driving means 931: Electric motor as extruding plate operating motor 933: Worm 934: Worm Gear 935: Transmission gear 937: Drive pulley 938: Transmission gear 939: Transmission gear 941: Driven pulley 943: Detection board 944: First detector (SW7) 945: Second detector (SW8) 946: First pin actuating pulley 947: Second pin actuating pulley 950: Actuating pin 951: Operation pin 952: Tension pulley 954: Timing belt 468: Solenoid (SOL1) 100: Control means 200: Electrostatic copying machine control means 201: Operating means 202: Display means

Claims (2)

[Claims] 1. An original table having an opening at a front portion in the original conveying direction, and an upper surface below the opening of the original table is arranged substantially flush with an upper surface of the original table, and an opening is provided on the upper surface. A vacuum chamber, a feeding belt provided with a plurality of holes wound around the vacuum chamber and operated in the document conveying direction, and air toward the front end of the document placed on the document table. Separating air jetting means for jetting, a regulation position arranged on a set document set at the document setting position at a stock position rearward of the document setting position of the document table and a retreat retracting from the regulation position Vacuum separating / feeding means having a discharge original stopper configured to be operable between the position and the position, and the original fed by the vacuum separating / feeding means is conveyed onto the transparent plate. Document transporting means, a document discharging means for discharging the document on the transparent plate to the stock position on the document table, and a rear end of the document mounted on the document discharging means and located at the stock position on the document table. A push-out plate configured to be operable between a corresponding retracted position and a push-out position that positions the front end of the document on the document table at the document setting position; and a feeding belt that drives a feeding belt of the vacuum separation feeding means. A motor, a push-out plate drive means for operating the push-out plate to the retracted position and the push-out position, and a control means for driving and controlling the feeding motor and the push-out plate drive means, the control means comprising: When the pushing plate driving means is driven to push the pushing plate to the pushing position, the feeding motor is driven to operate the feeding belt of the vacuum separating feeding means. Automatic document feeder. 2. The control means drives and controls the feeding motor and the pushing plate driving means so that the moving speed of the feeding belt and the pushing speed of the pushing plate are substantially the same. Automatic document feeder.