JPH05341597A - Automatic document feeding device - Google Patents

Abstract

PURPOSE:To carry out adjustment of deviation between an optical axis of an image generating machine main body and a center line in the front and rear direction of the ADF without moving the ADF as a whole and with extreme facility. CONSTITUTION:A main frame body 10 is loaded freely rotatally against a platen glass 8 provided above a housing 6 of the image generating machine. A paper feeding unit 12 is provided on one edge side of the main frame body 10 and a paper ejection unit 14 is provided on the other edge. A carrying belt mechanism 17 is placed between the paper feeding unit 12 and the paper ejection unit 14. A document placement table 16 is loaded against a table supporting means provided in the paper feeding unit 12 and its position can be adjusted by moving it in the front and rear direction of the image generating machine.

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 applied to an image processing machine such as an electrostatic copying machine or an image reader.

[0002]

2. Description of the Related Art A platen glass is provided on an upper surface of a housing body of an image processing machine, for example, an electrostatic copying machine. The upper surface of the housing body is further provided with an automatic document feeder.
der (hereinafter abbreviated as ADF) is mounted. Recently, various types of ADFs have been proposed for automating manuscript processing operations, in which a manuscript to be copied or read is carried into a required position on the platen glass and further taken out from the platen glass. It has been put to practical use. As prior art documents disclosing typical examples of ADF, there are, for example, JP-A-61-229744 and JP-A-63-295334.

In a typical example of an ADF, a main frame body of an electrostatic copying machine (hereinafter simply referred to as a copying machine) is rotatable about a main frame body rotation axis between a closed position and an open position. Installed in the housing. The main frame turning axis is positioned so as to extend along one edge of the platen glass on the back side (rear side) of the copying machine. The main frame is a substantially box-shaped unit body whose upper surface and side surfaces are usually covered with a synthetic resin cover and whose lower surface is open. When the main frame is positioned at the closed position, it covers the platen glass, and when positioned at the open position, the upper surface of the platen glass is opened. When the original is manually placed on the platen glass, it is necessary to open and close the main frame. Further, a paper feed unit is provided on one end side (left side of the copying machine) of the main frame body, and a paper discharge unit is provided on the other end side (right side of the copying machine). The main frame is provided with a document placement table and a document ejection tray. The document placing table is provided in the paper feeding unit, and the document discharge tray is formed on the upper surface of the cover between the paper feeding unit and the paper discharging unit. The paper feeding unit includes a document carry-in path from the document placing table to the platen glass, and the paper discharge unit includes a document carry-out path from the platen glass to the document discharge tray.
The document placing table is mounted on the side of the document feeding path entrance side of the paper feeding unit. The upper surface of the cover between the paper feeding unit and the paper discharging unit serves as the document discharging tray. Then, a document conveying means for conveying the document through the document carry-in path, the platen glass upper surface and the document carry-out path is provided. The original document conveying means includes an original document conveying means for conveying the original document through the original document conveying path, a conveying belt mechanism for conveying the original document along the upper surface of the platen glass, and an original document conveying means for conveying the original document through the original document conveying path. Is included. The transport belt mechanism is provided between the paper feed unit and the paper discharge unit. More specifically, the lower side of the cover between the paper feeding unit and the paper discharging unit,
That is, it is positioned below the document discharge tray.
When the main frame body is positioned at the closed position, the transport belt mechanism is positioned so as to face the platen glass.

The sheet feeding unit includes an opening / closing frame body which is rotatably supported about an opening / closing frame body pivoting axis extending substantially perpendicular to the main frame pivoting axis. The main frame body is provided with an upright front side plate and an upright rear side plate which are arranged at intervals in the opening / closing frame body turning axis direction, and the opening / closing frame body is arranged at intervals narrower than the above intervals in the coaxial line direction. A front side wall plate and a rear side wall plate are provided. The front side wall plate and the rear side wall plate of the open / close frame are rotatably supported by the upright front side plate and the upright rear side plate via bearing means, so that the open / close frame body turns as described above with respect to the main frame body. Freely supported. The main frame body is provided with a first carry-in path defining means, and the open / close frame body is provided with a second carry-in path defining means. A part of the document carry-in path is defined by the first carry-in path defining means and the second carry-in path defining means. The portion of the document carry-in path is opened by turning the open / close frame from the closed position to the open position. The above-mentioned document carry-in means for carrying a document through the document carry-in path includes a carry-in roller located on the most upstream side of the document carry-in path, a supply roller located downstream of the carry-in path, and an opening / closing frame mounted to and separated from the supply roller. It includes a separating roller and so on. Further, the document discharge means for discharging the document through the document discharge path of the paper discharge unit includes a discharge roller and the like. The document from the discharge roller is discharged from the discharge port of the paper discharge unit and is stacked on the document discharge tray. The document placing table provided in the paper feeding unit is positioned so as to project onto the document discharge tray.

[0005]

The conventional ADF described by taking a copying machine as an example is constructed as described above.
It has some problems to be solved. Here, three problems to be solved will be described by taking an ADF mounted on a copying machine as an example.

The first problem to be solved relates to the adjustment of the deviation between the optical axis of the copying machine body (the center line in the width direction of the copying machine body, that is, the center line in the front-back direction) and the center line in the front-back direction of the ADF. Conventionally, when the ADF is assembled to the main body of the copying machine, the position of the entire ADF in the front-back direction is adjustable with respect to the main body of the copying machine in order to adjust the deviation. However, in a large-sized copying machine in which the maximum size of the original used is, for example, the A2 size of JIS, the work of moving the entire ADF back and forth for adjusting the optical axis is a heavy burden on the operator, and the workability is high. Becomes significantly worse. On the other hand, it is conceivable that the optical axis is adjusted by moving the paper feeding unit back and forth, but moving the paper feeding unit causes a problem in terms of fitability with the ADF cover. However, the above problems cannot be fully solved.

A second problem to be solved relates to wiring of an electric wire for connecting a main frame body and an opening / closing frame body which is openably and closably attached to the main frame body. That is, the open / close frame is provided with electric elements such as various detectors, and an electric wire is passed from the main frame to the open / close frame in order to connect these electric elements and a power source. Therefore, this electric wire must be wired so as not to hinder the opening / closing operation of the opening / closing frame and not be damaged by the opening / closing operation. For this reason, conventionally, a structure is such that a hole is formed in one side wall plate part of the opening / closing frame at a position where the turning shaft part of the opening / closing frame is removed and an electric wire is passed through this hole, or the shaft part of the opening / closing frame is Was supported by a hollow bearing, and an electric wire was passed through the hole of this bearing. However, in the former case, a mechanism for adjusting the movement of the electric wire during the opening / closing operation is required, and there is a possibility that the electric wire is deteriorated or damaged due to the opening / closing operation. Further, in the latter, since the connector of a size that cannot penetrate the hole of the bearing is connected to the portion of the electric wire on the opening / closing frame side, the electric wire is passed through the hole of the bearing in advance before assembling the bearing, Then the connector must be connected to the wire. As a result, the work of assembling the wiring and the open / close frame becomes complicated, and the work efficiency is significantly reduced.

A third problem to be solved relates to stacking of originals discharged from the paper discharge unit on the original discharge tray. The documents discharged from the discharge port of the discharge unit need to be always and orderly stacked at a predetermined position on the document discharge tray regardless of the size and number of documents. As a means for achieving this purpose simply and effectively, it is known to provide an upward inclination on the document discharge tray which becomes higher in the document discharge direction. The conventional A
In the DF, the document placing table is mounted on the paper feeding unit so as to project over the document discharging tray, and the height of the document discharging tray is restricted to save space. On the other hand, when a large document such as the A2 size is used, a predetermined space is required between the document discharge tray and the document placing table. For this purpose, the above-mentioned discharge tray is further provided with a downward slope which becomes lower in the document discharge direction following the upward slope. The position of the apex formed by these two slopes, that is, the conversion point of the slope is
If the document is too close to the discharge port of the paper discharge unit, the document is separated from the discharge port by a predetermined distance or more due to inertia. As a result, the trailing edge of the document will not be aligned correctly,
It is highly possible that a later document will slip under the previous document and cause a stacking defect.

The present invention has been made based on the above facts, and the first technical problem is to adjust the deviation between the optical axis of the main body of the image generator and the center line in the front-rear direction of the ADF.
The object is to provide an improved ADF which can be done very easily without having to move the whole.

A second technical object of the present invention is that an electric wire for connecting a main frame body and an opening / closing frame body attached to the main frame body is provided so as to penetrate through a hole of a bearing of the opening / closing frame body. Despite the above, it is an object of the present invention to provide an improved ADF having extremely good assembling workability.

A third technical object of the present invention is to provide an improved ADF which always guarantees a good stack of originals regardless of the size of the originals.

[0012]

In order to achieve the above-mentioned first technical problem, in the first aspect of the present invention, a document placing table is provided with respect to the table supporting means provided in the paper feeding unit. Is mounted so that the position of the main body of the image generator can be adjusted by moving it in the front-back direction.

That is, according to the first aspect of the present invention, in order to achieve the above-mentioned first technical problem, the main frame body is placed in a closed position with respect to the platen glass provided on the housing of the image generator. The main frame is mounted so as to be rotatable between open positions, a paper feed unit is provided at one end of the main frame, and a paper discharge unit is provided at the other end of the main frame. In the automatic document feeder having a document placing table mounted on the paper feeding unit, a feeding belt mechanism is arranged to face the platen glass in the closed position of the main frame. The paper unit is provided with a table supporting means, and the document placing table is attached to the table supporting means so as to be movable in the front-back direction of the image generator to adjust its position. Automatic document transport Device, is provided.

In order to achieve the above second technical problem,
In the second aspect of the present invention, an electric wire is provided from an end of each plate in each of the support holes formed in one of the upright side plates of the main frame body and one of the side wall plates of the opening / closing frame body which are adjacent to each other. A notch that allows the support hole to pass through is provided, and a hollow bearing that penetrates each of the support holes is fixed to the upright side plate, and this hollow bearing is divided into two parts with respect to one dividing surface extending in the axial direction.

That is, according to the second aspect of the present invention, in order to achieve the second technical object, the main frame body is placed at a closed position and a platen glass provided on the housing of the image generator. The main frame is mounted so as to be rotatable between open positions, a paper feed unit is provided at one end of the main frame, and a paper discharge unit is provided at the other end of the main frame. A transport belt mechanism is arranged to face the platen glass at the closed position of the main frame body, and the paper feeding unit includes an opening / closing frame body having a pair of side wall plates. Is provided with a pair of upright side plates positioned adjacent to the outside of each of the side wall plates of the opening / closing frame, and each of the side wall plates is supported by each of the upright side plates via a bearing means. Thus, the open / close frame is closed to the main frame and An automatic wire that is mounted so as to be rotatable between positions, the bearing means includes at least one hollow bearing, and an electric wire connecting the main frame body and the opening / closing frame body is wired through a hole of the hollow bearing. In the document feeder, a support hole having a common axis is formed in one of the side wall plates and one of the upright side plates adjacent to the side wall plate, and the one of the side wall plates and the one of the upright side plates are formed. Is formed with a notch extending from each end to each of the support holes, and each of the notches is
The opening and closing frame is positioned so as to be aligned in the axial direction of the bearing in the closed position and has a width through which the electric wire can pass, and the hollow bearing is fixed to the one of the upright side plates and the supporting hole. Of the side wall plate, the one supporting hole of the side wall plate is rotatable with respect to the outer peripheral surface of the hollow bearing, and the hollow bearing is divided into two parts with respect to one dividing surface extending in the axial direction. There is provided an automatic document feeder, which is formed by

In order to achieve the above-mentioned third technical problem,
In the third aspect of the present invention, the apex formed by the upslope and the downslope formed on the document discharge tray is
It is provided at a position away from the discharge port of the discharge unit in the document discharge direction by a distance of at least 1/2 of the maximum document size used.

That is, according to the third aspect of the present invention, in order to achieve the above-mentioned third technical problem, the main frame body is placed in a closed position and with respect to the platen glass provided on the housing of the image generator. The main frame is mounted so as to be rotatable between open positions, a paper feed unit is provided at one end of the main frame, and a paper discharge unit is provided at the other end of the main frame. The transport belt mechanism is arranged so as to face the platen glass at the closed position of the main frame, and is discharged from the discharge port of the paper discharge unit at a position above the transport belt mechanism. A document discharge tray for stacking documents is provided, and a document placement table is attached to the paper feeding unit so as to project above the document discharge tray. Towards the direction In the automatic document feeder provided with a rising slope that becomes smaller and a descending slope that becomes lower in the document discharge direction following the rising slope, the apex formed by each of the slopes of the document discharge tray is There is provided an automatic document feeder, which is provided at a position away from the discharge port of the paper discharge unit in the document discharge direction by a distance of ½ or more of a maximum document size to be used.

[0018]

ADF constructed according to the first aspect of the present invention
In the above, the deviation between the optical axis of the image generator main body and the front-rear centerline of the ADF can be adjusted by moving the document placing table in the front-rear direction of the image generator with respect to the table supporting means. .. As a result, the deviation can be adjusted very easily without moving the entire ADF or the paper feeding unit. Even in a large ADF mounted on a large image generator, the burden on the operator is reduced and the workability is significantly improved.

A constructed according to the second aspect of the present invention.
In the DF, an electric wire is inserted from each notch into each supporting hole in a state in which the respective positions of the notches formed in the upright side plate of the main frame and the side wall plate of the opening / closing frame that are adjacent to each other are aligned in the axial direction. Can be inserted. That is, the electric wire connecting between the main frame and the opening / closing frame is pre-wired through the respective support holes before mounting the hollow bearing in the state where the connector is mounted. After that, the hollow bearing divided into two parts is fixed to the upright side plate of the main frame in a state where the divided surfaces are aligned so that the electric wire passes through the hole, and the hollow bearing penetrates each supporting hole.
Therefore, it is not necessary to previously pass the electric wire through the hole of the bearing, the wiring work is facilitated, and the working efficiency is significantly improved. Since the electric wire passes through the shaft portion, a mechanism for adjusting the movement of the electric wire due to the opening / closing operation of the opening / closing frame is not required, the configuration is simplified, and the cost is reduced. It also improves the appearance. Furthermore, since unnecessary force does not act on the wire, its deterioration,
Damage is also prevented.

A constructed according to the third aspect of the present invention.
In the DF, even if a large size document such as A2 size is discharged or a small size document is discharged, the rear end of the document is prevented from being separated from the discharge port of the discharge unit by a predetermined distance or more. To be done. As a result, regardless of the size of the original, the position of the trailing edge of the original is not significantly disturbed and is aligned almost accurately, preventing the later original from slipping into or curling under the previous original. A good stack of originals is always guaranteed.

[0021]

The invention will now be described in more detail with reference to the accompanying drawings, which illustrate a preferred embodiment of an ADF constructed according to the invention.

With reference to FIGS. 1 to 3, in the illustrated embodiment, the ADF generally designated by the numeral 2 is applied to the copying machine 4. In this specification, the front side means the front side of the copying machine 4 shown in FIG. 1, the rear side means the same back side, the right side means the same right side, and the left side means the same left side.
The copying machine 4 has a substantially rectangular parallelepiped housing 6, and a platen glass 8 (FIG. 2) is provided on the upper surface of the housing 6. The original to be copied is positioned at a required position on the platen glass 8. The copying machine 4 itself may be of a well-known form, and a description thereof will be omitted.
The ADF 2 has a main frame body 10 mounted on a platen glass 8 provided in the housing 6 so as to be rotatable between a closed position and an open position. The pivot axis (not shown) of the main frame 10 is provided on the platen glass 8 on the rear side of the copying machine 4.
Positioned to extend along one edge of the. The main frame body 10 is a substantially box-shaped unit body whose upper surface and side surfaces are covered with a synthetic resin cover and whose lower surface is open. When the main frame body 10 is positioned at the closed position, it covers the platen glass 8, and when it is positioned at the open position, the upper surface of the platen glass 8 is opened. A paper feed unit 12 is provided on one end side (left side of the copying machine) of the main frame body 10, and a paper discharge unit 14 is provided on the other end side (right side of the copying machine). The main frame 10 is also provided with a document placing table 16 and a document discharge tray 18. The document placing table 16 is provided in the paper feed unit 12, and the document discharge tray 18 is formed on the upper surface of the cover between the paper feed unit 12 and the paper discharge unit 14. The paper feeding unit 12 includes a document carry-in path 20 from the document placing table 16 to the platen glass 8, and the paper discharge unit 14 includes the platen glass 8.
A document discharge path 22 from the top to the document discharge tray 18 is included. The document placing table 16 is mounted on the entrance side of the document carry-in path 20 of the paper feeding unit 12. A conveyor belt mechanism 17 is provided below the cover between the paper feed unit 12 and the paper discharge unit 14, that is, below the document discharge tray 18.

A document feeding means for feeding a document through the document carry-in path 20, the upper surface of the platen glass 8 and the document carry-out path 22 is provided. This document feeding means is provided with a document loading path 2
0, a document carrying-in means for carrying a document through the document 0, a carrying belt mechanism 17 for carrying a document along the upper surface of the platen glass 8, and a document carrying-out means for carrying a document through a document carry-out path 22. ..

The paper feeding unit 12 is provided with a guide plate 24 that defines the document carry-in path 20 and guide plates 26 and 28 that are arranged so as to face the guide plate 24. The document carry-in means is provided in the paper feeding unit 12. The document carry-in means is a carry-in roller 3 arranged along the document carry-in path 20.
0, a separation roller pair 32 and a registration roller pair 34. A carry-in port 21 (see FIG. 2) is formed at the most upstream position of the document carry-in path 20 of the paper feeding unit 12. The sheet feeding unit 12 also includes an opening / closing frame body 38 that is supported so as to be rotatable with respect to the main frame body 10 about a pivot axis 36. The turning axis 36 is positioned so as to extend substantially perpendicular to the turning axis of the main frame body 10 described above. The open / close frame 38 is rotatably supported by the main frame 10 via bearing means arranged on the swivel axis 36, which will be described later in detail. The guide plate 2
One of the pair 6 and the separation roller pair 32 is provided on the opening / closing frame body 38 side. When the open / close frame 38 is positioned at the open position, the guide plate 26 separates from the opposing guide plate 24, and one of the separation roller pairs 32 separates from the other, so that many of the document carry-in passages 20 are included in the paper feeding unit 12. Is opened.

The conveyor belt mechanism 17 includes driven rollers 40 arranged at intervals in the conveying direction (left and right direction in FIG. 2).
A driven roller 42, an endless belt 44 wound around each of these rollers, and a plurality of pressing rollers 46. When the main frame body 10 is positioned at the closed position, the transport belt mechanism 17 is positioned so as to face the upper surface of the platen glass 8. The action traveling portion of the endless belt 44, that is, the lower traveling portion is pressed against the upper surface of the platen glass 8 by the action of the pressing roller 46. When the endless belt 44 is rotationally driven by a rotary drive source (not shown), the document can be conveyed from the left to the right along the upper surface of the platen glass 8. The paper discharge unit 14 includes a guide plate pair 48 that defines the document discharge path 22. The document discharge means is provided in the paper discharge unit 14. The document delivery means is
It includes a pair of carry-out rollers 50 and a pair of discharge rollers 52 arranged along the document carry-out path 22. Paper discharge unit 14
A document discharge port 54 is formed on the downstream side of the discharge roller pair 52.

The originals placed in a stacked state on the original placing table 16 are conveyed one by one from the carry-in port 21 through the original carry-in passage 20 by the rollers 30, 32, and 34 of the paper feeding unit 12. It is conveyed toward the mechanism 17.
The original is positioned at a predetermined position on the upper surface of the platen glass 8 by the action of the transport belt mechanism 17. Then, a predetermined copying process is performed in the copying machine 4. When the copying process is completed, the document is transported by the transport belt mechanism 17 toward the paper discharge unit 14. This document is output from the paper discharge unit 1.
Each of the rollers 50 and 52 of No. 4 passes through the document carry-out path 22 and is discharged from the discharge port 54 onto the document discharge tray 18. The basics of the configuration and operation of the ADF2 are disclosed in the specification of Japanese Patent Application No. 3-276388 filed on September 30, 1991 by the present applicant. In the present invention, the basic configuration and function of the sheet feeding unit 12, the sheet discharging unit 14, and the transport belt mechanism 17 themselves may be well-known forms, and therefore further description will be omitted.

Next, the mounting mechanism of the document placing table 16 to the paper feeding unit 12 will be described. Referring to FIGS. 3 and 4, the sheet feeding unit 12 is provided with table supporting means, and the document placing table 16 is moved in the front-rear direction of the copying machine 4 with respect to the table supporting means to adjust its position. It is installed so that you can. As shown in FIG. 4, the table supporting means is composed of a pair of table supporting members 56 having substantially the same structure. Each of the table supporting members 56 is fixed to a stay 58 provided in the paper feeding unit 12 so as to project from the paper feeding unit 12 at a predetermined interval in the front-rear direction of the copying machine 4.

The stay 58 is fixed below the carry-in port 21 of the paper feeding unit 12. Referring to FIGS. 4 to 6,
The stay 58 is composed of a metal plate that is bent and formed into a substantially L shape when viewed from the side. That is, the stay 58 includes a horizontal portion 60, an inclined portion 62 that extends from one end portion of the horizontal portion 60 to be inclined laterally upward, an upward portion from the end portion of the inclined portion 62, and a slight inclination from the vertical direction to the horizontal portion 60 side. And a mounting portion 64 that extends. Mounting flanges 66 and 68 for the sheet feeding unit 12 are provided at both ends of the horizontal portion 60 and the mounting portion 64, respectively. The mounting flanges 66 and 68 have two screw holes 66a and one screw hole 68a, respectively. Substantially the same slits 70 are formed near both ends of the mounting portion 64, and two screw holes 64 a are formed on the lower side of each slit 70. The stay 58 is the carry-in port 2 of the paper feeding unit 12.
1 below and along the opening 23 (FIG.
(See FIG. 19) and fixed to a pair of upright side plates 72 and 74 (see FIG. 19), which will be described later, provided on the main frame body on both sides of the sheet feeding unit 12 by using mounting flanges 66 and 68. To be done.

Since each of the table support members 56 has substantially the same structure, only one of them will be described here. 7 to 9, the table support member 5
6 is formed by bending a metal plate and has a substantially rectangular flat receiving surface 76 formed on the upper portion.
At the center of the receiving surface 76, a mounting portion 78 that projects obliquely downward
Is punched. The mounting portion 78 has one mounting hole 78a formed therein. Downwardly extending flanges 80 and 82 are formed on both sides of the receiving surface 76, and mounting flanges 84 and 86, which are bent in directions facing each other, are provided at one end thereof. The mounting flanges 84 and 86 have one mounting hole 84a and 8 respectively.
6a is formed. The mounting hole 84a is a long hole. At one end of the receiving surface 76, a hooking flange 88 bent upward is provided. When mounting the table support member 56 on the stay 58, the flange 88 of the table support member 56 is inserted (hooked) into the slit 70 of the stay 58. Mounting holes 84 for mounting flanges 84 and 86 of the table support member 56
The positions of a and 86a are aligned with the positions of the screw holes 64a of the stay 58, and they are fixed by screws (not shown) (see FIG. 16). Each of the table support members 56 is attached to the slit 70 of the stay 58 as described above.

Next, the document placing table 16 mounted on each of the table supporting members 56 will be described. With reference to FIGS. 10 to 12, the document placing table 16 is formed of a substantially box-shaped synthetic resin member having a flange on the periphery and having an open bottom. Document placing table 1
6 has a shape in which a part of a rectangle is cut out when seen from a plane, and two guide slits 90 and 92 extending linearly in the width direction are formed on the upper surface. As shown in FIG. 4, width defining members 94 and 96 for defining the width of the original are movably attached to the slits 90 and 92, respectively. A flange 98 formed on one end side of the document placing table 16 is formed with two recesses 100 and 102 which are open downward. As shown in FIG. 16, bottom plates 104 are mounted below the one end of the document placing table 16 at predetermined intervals.

As shown in FIGS. 13 to 15, the bottom plate 1
Reference numeral 04 denotes a metal plate having a substantially rectangular shape when seen in a plan view, and includes horizontal portions 106 and 108 and an inclined portion 1 between them.
10 and. Two mounting holes 112 are formed in the horizontal portion 106 and three mounting holes 112 are formed in the horizontal portion 108. Each mounting hole 112 is provided in a dish-shaped protruding portion formed upward from the bottom plate 104. Flanges 114 and 116 extending upward are formed at one end and the other end of the bottom plate 104. On the inclined portion 110, two mounting portions 118 are stamped and formed at intervals in the longitudinal direction. Each of the mounting portions 118 extends obliquely upward and has a mounting elongated hole 118a. On the lower surface of the document placing table 16, there are five bosses 120 protruding downward.
(See FIGS. 10 and 16) are formed. Boss 1
Each 20 is formed with a screw hole. Boss 12
The arrangement of 0s is substantially the same as the arrangement of the mounting holes 112 of the bottom plate 104. The bottom plate 104 is provided with holes 112 for attaching each of the bottom plates 104 to the lower surface of the document placing table 16.
And the screw hole of the boss portion 120 are aligned with each other, and are fixed by screws (not shown).

As shown in FIG. 16, when the bottom plate 104 is mounted on the original placing table 16, the bottom plate 104 is provided.
The flange 114 is positioned below the flange 98 of the document placing table 16. Therefore, the bottom plate 104
Flange 114 and flange 9 of the document placing table 16
Openings 122 and 124 are formed between the recesses 100 and 102 of FIG. The openings 122 and 124 have substantially the same configuration and are substantially rectangular that can be inserted into each of the table support members 56. The width of each of the openings 122 and 124 is formed wider than the width of each of the table support members 56. At the lower part of the document placing table 16 inside each of the openings 122 and 124, there is provided a placing part 126 that can be brought into contact with each receiving surface 76 of the table support member 56. The placing portion 126 extends inward from the inside of each of the openings 122 and 124.
It is composed of the lower surface of each of the book ribs. Referring to FIG. 16, openings 122 and 124 of document placing table 16 are shown.
When each of these is inserted into each of the table supporting members 56, each of the mounting portions 126 of the document mounting table 16 is mounted on each receiving surface 76 of the table supporting member 56.
Further, each of the mounting portions 118 provided on the bottom plate 104 of the document placing table 16 abuts on each mounting portion 78 of the table support member 56 to define the insertion position.
Further, the mounting elongated hole 118a of the mounting portion 118 and the mounting portion 78
Of the mounting holes 78a of the same. Then, the mounting elongated hole 118a is moved in the width direction (front-back direction of the copying machine 4) with respect to the mounting hole 78a, thereby adjusting the mounting position of the document placing table 16 with respect to the table supporting member 56 and fixing with the screw 119. To be done.

The original placing table 16 is the paper feeding unit 12
Since it is supported as described above, the deviation between the optical axis of the copying machine 4 and the center line of the ADF 2 in the front-rear direction is adjusted by moving the original placing table 16 with respect to the table supporting member 56.
This can be done by moving the copying machine 4 in the front-back direction. As a result, the adjustment of the deviation is performed without moving the entire ADF 2 or the paper feeding unit 12.
Very easy to do. Even in a large ADF mounted on a large copying machine, the burden on the operator is reduced and the workability is significantly improved.

Next, the structure of the bearing portion of the opening / closing frame 38 of the paper feeding unit 12 will be described. Referring to FIGS. 1 and 17 to 19, the sheet feeding unit 12 includes a pair of side wall plates 1.
It includes the open / close frame 38 having 30 and 132. The side wall plates 130 and 132 are arranged at a predetermined interval in the front-rear direction of the copying machine 4. In the main frame 10,
A pair of upright side plates 72 and 74 positioned adjacent to the outside of each of the side wall plates 130 and 132 of the opening / closing frame body 38 is provided. Since the side wall plates 130 and 132 are respectively supported by the upright side plates 72 and 74 via bearing means, the opening / closing frame body 38 is attached to the main frame body 10 so as to be pivotable between the closed position and the open position. To be done. The bearing means includes at least one hollow bearing 134. That is, in this embodiment, the bearing means includes the short shaft 136 fixed to the upright side plate 74 and the hollow bearing 13 fixed to the upright side plate 72.
4 and. More specifically, as shown in FIG. 19, upright side plates 72 and 74 are provided with support holes 72a and 74a having the same diameter, and side wall plates 130 and 132 are provided with support holes having the same diameter. Hole 130
a and 132a are formed. Each of these support holes has a common axis when the open / close frame 38 is mounted. A mounting flange 138 orthogonal to the one end of the short shaft 136 is fixed. Supporting hole 74
The short shaft 136 is fixed to the upright side plate 74 by inserting into the a and 132a and fixing the mounting flange 138 to the upright side plate 74 with the screw 140. The support hole 132a of the side wall plate 132 is rotatably supported by the short shaft 136.

The side wall plate 130 and the upright side plate 72 are formed with notches 130b and 72b extending from their upper ends to the support holes 130a and 72a, respectively. As shown in FIG. 19, each of the notches 130b and 72b is positioned so as to be axially aligned in the closed position of the opening / closing frame 38 and has a width that allows the electric wire 142 to pass therethrough.
The hollow bearing 134 includes a hollow cylindrical portion 144 having a predetermined axial length, and a mounting flange portion 146 extending radially outward from the outer peripheral surface of the hollow cylindrical portion 144 on one end side. The hollow cylindrical portion 144 is inserted into the support holes 72a and 130a, and the mounting flange portion 146 is fixed to the upright side plate 72 with the screw 148, whereby the hollow bearing 134 is fixed to the upright side plate 72. Support hole 130a of side wall plate 130
Is rotatably supported by the short shaft 136. 17 and 1
As shown in FIG. 8, the hollow bearing 134 is divided into two parts with respect to one divided surface extending in the axial direction. The split surface is a surface along the axis of the hollow bearing 134 in this embodiment. The dividing surface is also formed to include a hollow cylindrical portion 144 and a mounting flange portion 146. Therefore, the hollow cylindrical portion 144 is divided into two portions 144a and 144b, and the mounting flange portion 146 is divided into the portions 146a.
And 146b.

Since the bearing portion of the opening / closing frame 38 is constructed as described above, the support holes 130a and 72a are cut out from the notches 130b and 72b with the positions of the notches 130b and 72b aligned axially. An electric wire can be inserted inside. That is, the electric wire 142 connecting between the main frame 10 and the opening / closing frame 38 is in a state in which a connector (not shown) is mounted and before the hollow bearing 134 is mounted, each support hole 130.
Pre-wired through a and 72a. After that, the hollow bearing 134 divided into two parts has the electric wire 142 in its hole.
The divided surfaces are aligned so that the
It is fixed to the upright side plate 72 of the main frame body 10 in a state of penetrating through a and 72a. Therefore, it is not necessary to previously pass the electric wire through the hole of the bearing, the wiring work is facilitated, and the working efficiency is significantly improved. Since the electric wire 142 passes through the shaft portion, a mechanism for adjusting the movement of the electric wire 142 associated with the opening / closing operation of the opening / closing frame 38 is not required, and the configuration is simplified and the cost is reduced. It also improves the appearance. Further electric wire 14
Since unnecessary force does not act on 2, the deterioration and damage thereof are also prevented.

Next, the document discharge tray 18 will be described. Referring to FIGS. 1 to 3, on the upper surface of the cover between the paper feeding unit 12 and the paper discharging unit 14 of the main frame body 10,
A document discharge tray 18 for stacking documents discharged from the discharge port 54 of the paper discharge unit 14 is provided. As described above, the document placing table 16 is attached to the paper feeding unit 12 so as to project above the document discharge tray 18. On the document discharge tray 18, an ascending slope 18a that becomes higher in the document discharge direction (from right to left in FIGS. 1 to 3) and a descending slope 18b that becomes lower in the document discharge direction following the ascending slope 18a. And are provided. Each inclination 18a and 18b of the document discharge tray 18
The apex 18c formed by is provided at a position away from the discharge port 54 of the paper discharge unit 14 in the document discharge direction by a distance of ½ or more of the maximum document size used. The maximum document size in this embodiment is A2 /, and the discharge port 54 of the paper discharge unit 14 and the paper feed unit 12 are
Document discharge tray 1 whose both ends are defined by the inside of
The total length of 8 is longer than the length of A2 in the longitudinal direction.
The apex position 18c corresponds to the discharge port 5 of the paper discharge unit 14.
It is provided at a position away from A4 to the left by 1/2 or more of the longitudinal length of A2.

Since the document discharge tray 18 is constructed as described above, the rear end of the document is discharged even if a large size document such as A2 size is discharged or a small size document is discharged. It is prevented that the unit 14 is separated from the discharge port 54 by a predetermined distance or more. As a result, regardless of the size of the original, the position of the trailing edge of the original is not significantly disturbed and is aligned almost accurately, preventing the later original from slipping into or curling under the previous original. A good stack of originals is always guaranteed.

[0039]

In the ADF constructed according to the first aspect of the present invention, the deviation between the optical axis of the image generator main body and the center line in the front-rear direction of the ADF is adjusted by moving the document placing table in the front-rear direction. Can be done by doing
This can be performed very easily without moving the entire ADF or the paper feeding unit as in the conventional case. Particularly in a large ADF mounted on a large image generator, the burden on the operator is reduced and the workability is significantly improved.

A constructed according to the second aspect of the present invention.
With the DF, there is no need for the complicated work of inserting the electric wire into the hole of the bearing in advance and then attaching the connector to the electric wire as in the conventional case. Therefore, the work of assembling the wiring and the opening / closing frame can be facilitated. The efficiency is significantly improved. Since the electric wire passes through the shaft portion, a mechanism for adjusting the movement of the electric wire due to the opening / closing operation of the opening / closing frame is not required, the configuration is simplified, and the cost is reduced. It also improves the appearance. Furthermore, since unnecessary force does not act on the electric wire, its deterioration and damage are prevented.

A constructed according to the third aspect of the present invention.
In the DF, regardless of the size of the document, the position of the trailing edge of the document discharged from the discharge port of the paper discharge unit to the document discharge tray is aligned substantially accurately without being largely disturbed, and thus, unlike the conventional case. The subsequent document is prevented from being caught or curled under the previous document, and a good stack of documents is always guaranteed.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which an electrostatic copying machine is equipped with a preferred embodiment of an automatic document feeder configured according to the present invention.

FIG. 2 is a schematic sectional view showing the automatic document feeder of FIG.

3 is a perspective view showing the automatic document feeder of FIG. 1. FIG.

FIG. 4 is an exploded perspective view of a part of the automatic document feeder of FIG.

FIG. 5 is a front view partially showing the stay of FIG.

6 is a left side view of FIG.

7 is a top view of the table support member of FIG.

FIG. 8 is a side view of FIG. 7 seen from below.

FIG. 9 is a diagram of FIG. 7 viewed from the left.

10 is a plan view showing a main part of the document placing table of FIG.

FIG. 11 is a side view of FIG. 10 seen from below.

FIG. 12 is a diagram of FIG. 10 viewed from the left.

13 is a plan view showing the bottom plate of FIG.

14 is an enlarged side view of FIG. 13 seen from below.

FIG. 15 is a view on arrow A of FIG.

FIG. 16 is a side view showing a state in which a document placing table is attached to a sheet feeding unit.

FIG. 17 is a perspective view partially disassembling one of the bearing portions of the opening / closing frame in the automatic document feeder of FIG.

FIG. 18 is a perspective view showing an assembled state of FIG.

19 is a schematic plan view showing a bearing portion of an opening / closing frame body in the automatic document feeder of FIG.

[Explanation of symbols]

 2 Automatic Document Feeder 4 Electrostatic Copying Machine 6 Electrostatic Copying Machine Housing 8 Platen Glass 10 Main Frame 12 Paper Feeding Unit 14 Paper Ejecting Unit 16 Document Placement Table 17 Conveying Belt Mechanism 18 Document Ejecting Tray 18a Upward Inclination 18b Downward Inclination 18c Apex 38 Opening / closing frame 54 Discharge port 56 Table support member 72 and 74 Side wall plate 72a Support hole 72b Notch 104 Bottom plate 130 and 132 Upright side plate 130a Support hole 130b Notch 134 Hollow bearing 142 Electric wire

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masayuki Tsunoda, 1-2-2 Tamatsukuri, Chuo-ku, Osaka Mita Industrial Co., Ltd. (72) Takeshi Nagao 1-2-2 Takumazo, Chuo-ku, Osaka Mita Within Kogyo Co., Ltd.

Claims (6)

[Claims] 1. A main frame is mounted on a platen glass provided on a housing of an image generator so as to be rotatable between a closed position and an open position, and a paper feeding unit is provided at one end of the main frame. A paper discharge unit is provided on the other end side, and a conveyor belt mechanism is positioned between the paper feed unit and the paper discharge unit so as to face the platen glass at the closed position of the main frame. In the automatic document feeder having the document placing table mounted on the sheet feeding unit, the sheet feeding unit is provided with a table supporting means, and the document placing table is mounted on the table supporting means. On the other hand, an automatic document feeder which is mounted so as to be able to move in the front-back direction of the image generator and adjust its position. 2. The table supporting means is composed of a pair of table supporting members having substantially the same structure, and each of the table supporting members is arranged so as to protrude from the paper feeding unit at a predetermined interval. The table supporting unit is fixed to the sheet feeding unit and has a receiving surface formed at an upper portion and a mounting portion protruding downward and having a mounting hole. An opening having substantially the same configuration that can be inserted into each of the members is formed, the width of each of the openings is formed to be wider than the width of each of the table support members, and the inside of each of the openings is formed. At the lower part of the document placing table, there are provided a placing part that can come into contact with the receiving surface of each of the table supporting members, and an attaching part having an elongated mounting hole extending in the front-rear direction. Opening the mounting table When each of the parts is inserted into each of the table supporting members, each of the mounting parts of the document mounting table is mounted on the receiving surface of each of the table supporting members, and the document mounting is performed. Each of the mounting portions of the mounting table abuts on the mounting portion of each of the table support members to define the insertion position, and the mounting elongated hole of the mounting portion and the mounting hole of the mounting portion are aligned with each other. Then, the mounting position of the document placing table with respect to the table supporting member is adjusted by moving the attachment elongated hole in the front-rear direction with respect to the mounting hole, and it is possible to fix with a screw. The automatic document feeder according to claim 1. 3. The document placing table is composed of a substantially box-shaped synthetic resin member having a flange on the periphery and having an open bottom, and the document placing table is provided with a flange on one end side thereof. Each of the openings is formed, and a bottom plate is attached to the lower side of the one end side of the document placing table at a predetermined distance from the placing section, and the bottom plate defines the bottom of the opening. Then
3. The automatic document feeder according to claim 2, wherein the mounting portion is formed on the bottom plate. 4. A main frame is mounted on a platen glass provided on a housing of an image generator so as to be rotatable between a closed position and an open position, and a paper feeding unit is provided at one end of the main frame. A paper discharge unit is provided on the other end side, and a conveyor belt mechanism is positioned between the paper feed unit and the paper discharge unit so as to face the platen glass at the closed position of the main frame. The sheet feeding unit includes an opening / closing frame body having a pair of side wall plates, and the main frame body has a pair of side wall plates positioned adjacent to each outside of the side wall plates. An upright side plate is provided, and each of the side wall plates is supported by each of the upright side plates via bearing means, so that the opening / closing frame can be swung between a closed position and an open position with respect to the main frame. Mounted on at least one of said bearing means
In an automatic document feeder including an individual hollow bearing, and an electric wire connecting the main frame and the opening / closing frame through the hole of the hollow bearing, one side wall plate and one side wall plate adjacent thereto. A support hole having a common axis is formed in one of the upright side plates, and a cut extending from each end to each of the support holes is formed in the one of the side wall plates and the one of the upright side plates. A notch is formed, each of the notches is positioned so as to be axially aligned with the bearing in the closed position of the opening / closing frame, and has a width through which the electric wire can pass, and the hollow bearing has the upright position. The side wall plate is fixed to the one of the side plates and positioned so as to pass through each of the supporting holes, and the one supporting hole of the side wall plate is rotatable with respect to the outer peripheral surface of the hollow bearing. It is formed by dividing into two parts with respect to one divided surface extending in the axial direction. An automatic document feeder, characterized in that. 5. The hollow bearing includes a hollow cylindrical portion having a predetermined axial length, and a mounting flange portion extending radially outward from an outer peripheral surface on one end side of the hollow cylindrical portion, and the split surface. The automatic document feeder according to claim 4, wherein the automatic document feeder is formed to include the hollow cylindrical portion and the mounting flange portion. 6. A main frame is mounted on a platen glass provided on a housing of an image generator so as to be rotatable between a closed position and an open position, and a paper feeding unit is provided at one end of the main frame. A paper discharge unit is provided on the other end side, and a conveyor belt mechanism is positioned between the paper feed unit and the paper discharge unit so as to face the platen glass at the closed position of the main frame. And a document discharge tray for stacking documents discharged from the discharge port of the paper discharge unit, the document discharge tray being provided above the transport belt mechanism. The table
It is mounted so as to project above the document discharge tray, and on the document discharge tray, an ascending slope that becomes higher in the document discharge direction and a descending slope that becomes lower in the document discharge direction following the ascending slope. In an automatic document feeder provided with a slant, the apex formed by each of the slants of the document discharge tray is the largest document used from the discharge port of the paper discharge unit toward the document discharge direction. An automatic document feeder, which is provided at a position separated by 1/2 or more of the size.