JP3448792B2 - Automatic document feeder - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic copying machine or an image forming apparatus.
For automatic document feeders installed in document processors such as readers
Related. 2. Description of the Related Art In recent years, copiers have become faster and faster.
With the automation, multiple originals are automatically and sequentially automatically placed on the top of the transparent plate.
Using an automatic document feeder that feeds the original set position
It is becoming. Also, facsimile and image reading
Automatically send multiple documents to a document processor such as a printer
Automatic document feeders are widely used in practice. this
The automatic document feeder has a document table on which documents are placed.
Before feeding the original placed on the original table
Means, and one sheet of the original sent out by the advance feeding means.
A document separation mechanism that separates and feeds each document is provided. This
The document separation mechanism includes a paper feed roller and a paper feed roller.
Operates in the direction opposite to the transport direction
And a separation belt mechanism between the two.
If the manuscript has been transported, the upper
The movement in the transport direction is regulated by the frictional force of the release belt mechanism.
While transporting only the lowest document by the paper feed roller
Such a friction system is generally put to practical use. [0003] The above-mentioned friction system
Paper feed roller and separation bell
Since multiple documents are fed between the printer and the
It is inevitable that the originals rub against each other,
Manuscript stains occur due to friction between the manuscripts. This
Solve the above-mentioned problem caused by the friction method where
A document separation mechanism using the air method is also proposed to erase
But requires a lot of space,
There is a problem that it is so expensive and expensive. [0004] The present invention has been made in view of the above facts.
The main technical issue is the frequent rubbing of documents.
The document as much as possible,
Document separation mechanism that can reduce
Another object of the present invention is to provide an automatic document feeder. According to the present invention, there is provided the above-mentioned technique.
Document table on which documents are placed to achieve technical tasks
And a lower guide plate disposed downstream of the original table.
Are disposed at a predetermined interval above the lower guide plate.
The upper guide plate and the original placed on the original table
Forward feed means for discharging the air, and the downstream side of the advance feed means.
Open the opening provided in the lower guide plate from below the lower guide plate.
Is arranged to protrude upward and rotate in the transport direction.
Paper feed roller and the upper guide from the upper side of the upper guide plate.
It is arranged facing the paper feed roller through an opening provided in the plate.
Separation bell installed and operated in the direction opposite to the transport direction
Document separation mechanism having a document mechanism
In the transfer device, the separation belt mechanism is located upstream in the transfer direction.
Roller disposed on the side, and conveyance of the first roller
A second roller disposed at an interval downstream in the direction,
The separation roller wound around the first roller and the second roller
And the first roller is connected to the separation bell.
And a roller section for mounting the
A diameter larger than the sum of the outer diameter of the roller portion and the thickness of the separation belt
Regulating portion, the lower end of the large-diameter regulating portion and the lower end thereof.
That a predetermined gap is formed between the side guide plate
An automatic document feeder is provided. According to the present invention, there is provided an automatic document feeder configured according to the present invention.
The originals transported to the document separation mechanism.
The manuscript has its front end in contact with the regulating portion of the first roller,
Due to the action of the regulating part rotating in the direction opposite to the
Most of them are restricted from moving downstream. others
To be fed between the paper feed roller and the separation belt.
Manuscripts are limited to the lowest manuscript or one or two lower manuscripts
Is done. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an automatic document transporter constructed according to the present invention will be described.
Preferred embodiments of the feeding device will be described in detail with reference to the accompanying drawings.
Will be described. FIGS. 1 and 2 show an upper end portion of the electrostatic copying machine 2.
And the automatic document feeder 4 mounted thereon are shown in FIG.
I have. The electrostatic copying machine 2 has a housing 6, and the housing
A transparent plate 8 (FIG. 2), which may be a glass plate, is disposed on the upper surface of the ring 6.
Has been established. One side of the transparent plate 8 (the left side in FIG. 2)
Side) is a document regulating member 1 for determining a document set reference position G.
0 is disposed, and the other side (the right side in FIG. 2) is statically mounted.
A blocking member 12 is provided. Constructed according to the present invention
The automatic document feeder 4 includes a housing 6 of the electrostatic copying machine 2.
On the upper surface of the transparent plate 8 extends along the rear edge
As a center, the closed position shown by a solid line in FIG.
It is mounted to be able to pivot between the positions. Electrostatic copier 2
When the original is manually placed on the transparent plate 8 of the
With the document conveying device 4 in the open position, the transparent plate 8 is exposed,
Place a document on a required position on the plate 8 and automatically transport the document
The transparent plate 8 was placed on the transparent plate 8 with the device 4 closed.
Cover the manuscript. When placing the original on the transparent plate 8, the original
Of the original is brought into contact with the leading edge of the original regulating member
By positioning one edge at the document set reference position G,
Thus, the original can be positioned at a required position. Automatic field
Automatically transports the original onto the transparent plate 8 using the original transport device 4
And automatically unloading from the transparent plate 8
, The automatic document feeder 4 is positioned at the closed position. Continuing the description with reference to FIG.
The moving original transport device 4 is moved in the front-rear direction (in FIG.
Front cover 14 arranged at an interval in
A rear cover 16 is included. Front cover 14 and rear
The cover 16 can be formed from a suitable synthetic resin.
You. A rear support substrate (not shown) is provided in the rear cover 16.
Is provided, and such a rear support substrate is
A mounting mechanism (not shown) that may itself be a known form
Through the upper surface of the housing 6 of the electrostatic copying machine 2
It is attached to. Various components of the automatic document feeder 4
Element is directly or indirectly supported on the rear support substrate
Have been. Between the front cover 14 and the rear cover 16
Is provided with a document placing means 18 and a document discharge tray 20.
I have. The original placing means 18 is located at the left end in FIG.
Documents that extend upward from the edge to the right rear edge
Table 22 and pivotable to the rear end of the document table 22
And an auxiliary table 24 mounted on the auxiliary table. Manuscript
The table 22 has a pair of width regulating portions movably in the width direction.
Material 26 is mounted. Such a pair of width regulating members
26 is below the document table 22 itself is well known
Via a rack and pinion mechanism (not shown)
Are interconnected and approach each other in conjunction with each other
In the direction of movement and in the direction away from each other.
The document discharge tray 20 is provided below the document placing means 18.
From the front-back direction (the direction perpendicular to the plane of FIG. 2).
The document placing surface 28 formed in a chevron shape is formed.
You. Between the left ends of the front cover 14 and the rear cover 16
A left end cover 30 is provided, and a right end cover 30 is provided between right end portions.
A unit cover 32 is provided. The front cover 14
In the open / close state of the automatic document feeder 4
The open / closed state of the safety switch SW1 and the left end cover 30
Safety switch SW2 to be detected and right end cover 32
A safety switch SW3 for detecting the open / closed state of the
And these switches are arranged in series,
The covers are in the closed position and all switches are closed.
Then, an ON signal is output to the control means described later. Continuing the description with reference to FIGS.
On the downstream side of the document table 22, a forward feed unit 38 is provided.
Document loading means 33 having a document separation mechanism 60 is provided.
Have been. The document loading means 33 includes the document table.
A lower guide plate extending downstream from the lower guide plate;
Upper guide plate disposed at a predetermined interval above the upper guide plate 34
36. The upper guide plate 36 is a forward sender.
It is disposed downstream from the downstream end of the step 38 in the transport direction.
You. A forward feed means 38 is provided below the lower guide plate 34.
Feed roller made of a rubber material having a predetermined coefficient of friction
40, and the forward feed roller 40 is disposed on the lower side.
Slightly above the opening 42 formed on the upstream side of the guide plate 34
It is arranged to protrude. Above the advance roller 40
Is provided with a forward feed pressurizing means 44 constituting the forward feed means 38.
Has been established. The forward feed pressurizing means 44
Roller 40 and is arranged in parallel with the advance roller 40.
A rotating shaft 46 having an upper end fixed to the rotating shaft 46 and a lower end
Is placed on the document table 22 and on the lower guide plate 34
And a pressure plate 48 acting on the original 50 inserted in the
ing. The pressing plate 48 is a stainless steel in the illustrated embodiment.
Formed by an elastic thin plate made of
The upper end is fixed to the rotating shaft 46 by a fixing means such as a screw.
The lower end of the feed roller 40
Placed on the original table 22 at the upper position of
Acts on the upper surface of the top document 50 and moves the document 50 forward.
It is configured to press against the roller 40. Forward feed pressurization
The rotating shaft 46 constituting the means 44 is provided with the forward feed roller 4.
0 at the front and rear ends of a support substrate 51 disposed above
Side plate 51a (only the rear side plate 51a is shown in FIG. 5).
) Is rotatably supported. This rotating shaft 46
Is connected to the solenoid SL1 via the link mechanism 52.
When the solenoid SL1 is urged, the return spring
54 in the direction shown by arrow 56 against the spring force of 54.
When the solenoid SL1 is deenergized, the return spring 54
It is rotated in the direction shown by arrow 58 by the spring force.
You. Therefore, the pressing plate 48 attached to the rotating shaft 46 is
The solenoid SL1 is biased and the rotation shaft 46 is indicated by an arrow 56.
The original inserted on the stationary plate 34 when rotated in the
When the manuscript 50 is pressed, the solenoid SL1 is deenergized and the rotating shaft 4
6 is a direction indicated by an arrow 58 by the spring force of the return spring 54
When the document is turned, the document is separated from the document 50. This
The forward feed means 38 configured as follows is a forward feed pressurizing means.
44 solenoid SL1 is urged by the pressure plate 48
The original 50 inserted on the stationary plate 34 is pressed, and
By driving the roller 40, it is possible to
Friction drive generated at the contact portion with the lower surface of the lowermost document 50
The lowermost document 50 can be sent out by force.
The support substrate 51 has an original as a document detecting means.
A document set switch SW4 is provided.
The switch SW4 is placed on the original table 22.
When the original 50 is inserted on the lower guide plate 34, the first
ON signal as the signal of
When the document 50 is not placed, O as the second signal
The FF signal is output to the control means described later. [0011] The first feed means 38 is provided on the downstream side.
The document separation mechanism 60 is disposed below the lower guide plate 34.
Through the opening 62 formed in the lower guide plate 34
A plurality of roller portions 641 (FIG.
Paper feed roller 64 having five in the illustrated embodiment)
And the upper guide plate 36 and the paper feed roller 64
And formed on the upper guide plate 36.
Bell protruding downward through opening 77
And a switching mechanism 66. The upper guide plate 36
At the upstream end (right end in FIG. 3)
An inclined portion 361 is formed to extend inclining upstream to the crab.
I have. On the back surface of the inclined portion 361,
The document regulating plate 59 is fixed to the facing position by a fixing means such as an adhesive.
Is attached. This document regulating plate 59 has its lower end
Is formed so as to project downward from the lower surface of the upper guide plate 36.
Have been. Therefore, the original regulating plate 59 is connected to the original table.
Document placed on the lower guide plate 34 and placed on the lower guide plate 34
Restrict most of 50 to move to the document separation mechanism 60 side
Only the lower several sheets move to the separation belt mechanism 66 side.
Is allowed. The separation belt mechanism 66 is
Arranged above the upper guide plate 36 and arranged upstream.
A driving roller 67 as a first roller;
67 are arranged in parallel at a distance downstream in the transport direction of 67
A driven roller 68 as a second roller;
7 and a separation belt 69 wound around a driven roller 68.
I have it. The drive roller 67 is formed of a synthetic resin.
And a plurality of roller portions 671 (in the illustrated embodiment,
5), and among the plurality of roller portions,
Outside the rollers on both sides, a larger diameter than the diameter of the rollers
The regulation part 672 is formed integrally. The regulation unit 6
The diameter of the roller 72 is equal to the diameter of the roller 671 and the separation belt 69.
0.3 to 3.0 mm, preferably 0.5
About 1.0 mm larger
The gap between the lowermost end of the portion 672 and the upper surface of the lower guide plate 34 is
It is configured to be about 0.3 to 0.5 mm. The follower
Roller 68 is also made of synthetic resin,
A plurality of roller portions 68 corresponding to 67 roller portions 671
1 (five in the illustrated embodiment). Said
The separation belt 69 is formed of a synthetic rubber material.
A plurality of roller portions 671 and
And a plurality of roller portions 681 of the driven roller 68
A plurality (5 in the illustrated embodiment) is provided correspondingly.
And the corresponding roller portions 671 and 681
Each is wound. The plurality of separation belts 69
Alternately with a plurality of roller portions 641 of the paper feed roller 64
And an opening 74 formed in the upper guide plate 36.
And project downward. Forward feed roller
40, paper feed roller 64 and separation belt mechanism 66
Transmission of the motor M1 and the gear mechanism and the electric belt mechanism
Each of the arrows 7 is driven by driving means 78 comprising a moving mechanism 76.
It is driven to rotate in the directions indicated by 9, 80 and 82.
Therefore, the advance roller 40 and the paper feed roller 64
The document is rotated in the transport direction, and the separation belt mechanism 66
It is operated in the direction opposite to the transport direction. Note that the
A rotor constituting a document conveyance amount detecting means is provided on the moving motor M1.
Rotation detection means such as a lead encoder or frequency generator
The stage FG1 is mounted, and a pulse as a detection signal thereof is provided.
The signal is output to the control means described later. Configured in this way
The separated document separating means 60 operates as follows. That is,
The front end of the document fed by the feed roller 40
When the paper reaches the drive roller 67 of the document separation mechanism 60, the drive
The roller is provided on the side of the roller portion 671 that constitutes the moving roller 67.
Abuts on the restricting portion 672 that has been set. At this time, advance roller
Lowermost document 5 whose lower surface is frictionally driven by 40
0 is further conveyed toward the paper feed roller 64, and
Documents 50 other than the first place also occur when the lowest document moves.
Documents that are to be transported by frictional force but are not at the bottom
50 is a driving roller 6 rotating in the direction opposite to the transport direction.
7 to the feed roller 64 side by the action of the regulating portion 672
Movement is regulated. Conveyed toward the paper feed roller 64
Documents are rotated in the transport direction even if there are multiple
Is moving in the direction opposite to the sheet feeding roller 64 and the conveyance direction.
By the separating action by the separating belt 69, the lowermost original
Only the manuscript is sent to the manuscript carrying path 98. In addition,
In the separation operation by the rubber 64 and the separation belt 69,
Rubbing between originals occurs, and the number of rubbing
Then, the original stain becomes remarkable. However, the figure
In the illustrated embodiment, the sheet is fed toward the document separation mechanism 60.
Most of the originals output from the regulating portion 672 of the drive roller 67
The feed roller 64 and the separation belt 6 are regulated by the action.
9 is the lowest original or the lower original.
One or two originals, so the originals rub against each other
Reduces the frequency of originals and reduces document contamination due to rubbing between originals.
Can be reduced. In the illustrated embodiment,
The regulating portion 672 includes a plurality of rows forming a drive roller.
Provided on the roller portions located on both sides of the
However, the regulating section 672 is provided on another roller section.
You may ask. The forward feed means 38 and the document separation mechanism 60
Between the document tables, as shown in FIGS.
Original 5 placed on top of document 22 and inserted on lower guide plate 34
0 and the action position for restricting insertion of the
The retractable position allows the movement to the document separation mechanism 60 side.
A movable document stopper 84 is provided.
You. The document stopper 84 is located below the lower guide plate 34.
And its base end is located upstream of the forward feed roller 40.
A rotation disposed in parallel with the axis of the feed roller 40 and spaced apart therefrom.
The front end is fixed to the driving shaft 86 and the lower end thereof is connected to the lower guide plate 34.
It is located through the opening that is formed. The manuscript
The rotating shaft 86 to which the topper 84 is attached is a stopper driving means.
87. The stopper driving means 8
7 is a latch type solenoid SL2 and the latch type solenoid
Connecting the plunger 90 of the door SL2 to the rotation shaft 86.
Link mechanism 88. The latch type solenoid
The SL2 may be a well-known one and has a permanent magnet and an attraction inside.
It has a coil and a separation coil.
When energized, the plunger 90 is sucked, and in this state the permanent magnet
Suction coil by attracting plunger 90 by the magnetic force of stone
Is deenergized, the plunger 90 is held in the suction state.
When the plunger 90 is separated from the suction state,
Energizes the separation coil and plunges against the magnetic force of the permanent magnet.
Plunger even after the separation coil is de-energized
The keyer 90 is kept in the separated state. Follow
To urge the suction coil of the latch type solenoid SL2
When the plunger 90 is sucked, the rotating shaft 86 turns to the arrow 92.
Pivoted in the direction shown, and attached to the pivot shaft 86.
The document stopper 84 is in the retracted position shown by a solid line in FIG.
Be positioned. Further, the release of the latch type solenoid SL2 is performed.
When the plunger 90 is separated by urging the coil between
The shaft 86 is rotated in the direction shown by the arrow 94,
In FIG. 3, the document stopper 84 attached to the
The return spring 96 is positioned at the operation position indicated by the dotted chain line.
Held by spring force. Note that the original stopper 84
Has a shielding plate 85 attached to it, while the original
When the pallet 84 is located at the retracted position shown by the solid line,
The stopper position detecting means SW5 is provided at the position where
You. The stopper position detecting means SW5 includes a light emitting element and a light receiving element.
And the document stopper 84 is in the action position indicated by the two-dot chain line.
ON as the first signal when the
The signal is placed at the retract position where the document stopper 84 is indicated by a solid line.
The shielding plate 85 is located between the light emitting element and the light receiving element.
The OFF signal as the second signal when the control
Output to the column. The description will be continued with reference to FIGS.
The transport belt mechanism 100 is provided below the original placing means 18.
Are arranged. Conveying belt mechanism that constitutes conveying means
100 denotes an interval in the transport direction (the horizontal direction in FIG. 2).
Roller 102 and driven roller 10
4, the endless belt 106 wound around these,
Disposed between the moving roller 102 and the driven roller 104
Rolling rollers 105a, 105b, 105c, 105d,
105e. Lower traveling section of endless belt 106
Is extended along the transparent plate 8 of the electrostatic copying machine 2.
Thus, a document conveying path 108 is defined between them. this
Between the document conveying path 108 and the document separating means 60
Is formed with a document carrying path 98. This document loading path
98 is between the inner guide plate 110 and the outer guide plate 112
Stipulated. A registration roller is provided in the document loading path 98.
A pair 114 is provided. The registration roller pair 114
Consists of a driving roller 116 and a driven roller 118
I have. Note that a pair of registration rollers in the document loading path 98
On the upstream side of 114, a reflection composed of a light emitting element and a light receiving element
An optical document detector SW6 is provided.
The output unit SW6 detects the document 50 passing through the document carrying path 98.
Then, the detection signal is sent to the control means described later. Previous
The drive roller 102 and the registration of the conveyance belt mechanism 100
The driving roller 116 of the pair of strollers 114 rotates forward and backward.
Possible electric motor M2 and gear mechanism and belt mechanism etc.
Rotating by driving means 120 comprising a transmission mechanism 118
Driven. The driving of the pair of registration rollers 114
The roller 116 is provided between the transmission mechanism 118 and the electromagnetic clutch C.
They are connected via L1. The electric motor M
Reference numeral 2 denotes a rotary encoder which constitutes a document conveyance amount detecting means.
The rotation amount detecting means FG2 such as a loader or a frequency generator
The pulse signal that is attached and its detection signal is described later.
Output to the control means. On the right side of the document conveying path 108, the document is inverted and discharged.
An exit means 128 is provided. The document reversing / discharging means
128 is provided with a first document discharge path 130,
The first document output path 130 is a reverse
Between the roller 134 and the outer guide plates 136, 138.
Is defined. In addition, three pieces are provided on the outer circumference of the reversing roller 134.
Driven rollers 135a, 135b, and 135c are pressed.
It is arranged in the state where it was. The first document discharge path 130
Downstream of the second document discharge path 140 and the document reversal path 1
42 is provided in a branched manner.
A control plate 144 is provided. Second document output path 140
Is defined between the branch control plate 144 and the outer guide plate 146.
Have been. At the downstream end of the second document discharge path 140,
A discharge roller composed of a driving roller 148 and a driven roller 150
A roller pair 152 is provided. In addition, the second document unloading
The path 140 has a reflection type optic comprising a light emitting element and a light receiving element.
The original document detector SW7 is provided.
Detects the document 50 passing through the second document output path 140
Then, the detection signal is sent to the control means described later. Said
The reversing path 142 includes a reversing roller 134 and a branch control plate 144.
And the outer guide plate 154,
The downstream end is formed facing the downstream end of the document conveying path 108.
Have been. A light emitting element and a light receiving
A reflection type optical original detector SW8 comprising an element is provided.
And the detector SW8 passes through the document reversing path 142.
The original 50 to be detected is detected, and the detection signal is sent to a control
Send to the stage. The branch control plate 144 has a shaft 15
6 and operated by solenoid SL3
And the solenoid SL3 is de-energized
2, the spring force of the return spring 158
The solenoid SL3 is positioned at the position indicated by the line.
Is biased against the spring force of the return spring 158
2 is positioned at the position indicated by the two-dot chain line. Follow
And the original conveyed through the first original discharge path 130
Is the second when the solenoid SL3 is deenergized.
The document is sent to the document output path 140, and the solenoid SL3 is energized.
Is fed to the document reversing path 142
ing. The reversing roller 134 and the discharge roller pair 152
The driving roller 148 constituting the
From a transmission mechanism 160 such as a gear mechanism or an electric belt mechanism.
Arrows 164 and 166 respectively by the driving means 162
Is rotated in the direction indicated by. The electric motor
The rotary M, which constitutes the document conveyance amount detecting means, is
Rotation amount detecting means FG such as encoder or frequency generator
3 is attached, and the pulse signal which is the detection signal is
Output to control means described later. The automatic document feeder includes a control unit 2 shown in FIG.
00 is provided. The control means 200
Computer and follow the control program.
A central processing unit (CPU) 201 for performing arithmetic processing
Lead-on memory for storing control programs and control maps
(ROM) 202, readable and writable for storing calculation results, etc.
Random access memory (RAM) 203
204, an input interface 205 and an output interface.
And an interface 206. Configuration like this
To the input interface 205 of the
Are the safety switches SW1, SW1, SW3,
Switch SW4, stopper position detecting means SW5,
Projection type optical detector SW6, SW7, SW8 and rotation amount
Input detection signals from detection means FG1, FG2, FG3, etc.
The electric motor M
1, M2, M3, solenoid SL1, SL3, latch type
Control signal to solenoid SL2 and electromagnetic clutch CL1
Is output. Further, the control unit 200 controls the electrostatic copying machine 2
It is connected to the control means 210, and
The exchange of the control signal is performed. Control means of electrostatic copying machine 2
The operation means 220 and the display means 230 are connected to 210.
Has been continued. The operating means 220 is, as shown in FIG.
The copy start key and the number of copies
Number designation key, double-sided copy designation key, copy operation stop key
, Etc., are provided, and the electrostatic copying machine 2
Copy information is input to the control means 210 of FIG. Display means 23
0 is on the upper surface of the front of the electrostatic copying machine 2 in the same manner as the operating means 220.
It is arranged adjacent to the operation means 220 and provides copy information and fault information.
Display information. A document separation mechanism according to the illustrated embodiment is provided.
The automatic document feeder is configured as described above.
The operation procedure is shown in the flowcharts of FIGS.
This will be described with reference to FIG. FIGS. 7 to 9 show the main rule.
10 is a subroutine for primary paper feeding, and FIG.
FIG. 12 shows a subroutine for sheet feeding, and FIG.
It is shown. In the main routine shown in FIGS.
First, the control means 200 sets the safety switch in step S1.
SW1, switch SW2 and switch SW3 are all
Check whether it is ON. That is, automatic document transport
The feeding device 4, the left end cover 30 and the right end cover 32
It is dangerous if the automatic document feeder 4 operates when it is opened.
If any one of them is opened,
This is a check for prohibiting the operation of the document transport device 4.
Therefore, in step S1, the safety switch SW1, switch
Either switch SW2 or switch SW3 is O
In the case of FF, until the cover is located in the closed position
Wait, if all switches are ON, step S2
To whether the document set switch SW4 is ON
That is, whether a document is placed on the document table 22
Check whether or not. Original set switch SW4 is turned on
If not, the original is placed on the original table
It is determined that it has not been performed, and the process returns to step S1. Steps
The document set switch SW4 is turned on in S2.
The document is placed on the document table 22
The control means 200 proceeds to step S3.
A copy start signal is sent from the control unit 210 of the electrostatic copying machine 2
Check if it has been done. This copy start signal is
The author uses the copy start key of the operation unit 220 to copy the copy start signal.
Input from the control unit 210 to the control unit
Sent to 200. Therefore, the copy start signal is not sent.
If not, return to step S1 because there is no need to copy
You. In step S3, a copy start signal has been sent.
In this case, the process proceeds to step S4, where the control means 200 stops the storage.
Whether the paper position detecting means SW5 is ON, ie, the document stopper
84 is positioned at the operation position indicated by the two-dot chain line in FIG.
Check whether it has been done. This is the original stopper 8
4 is positioned at an operation position indicated by a two-dot chain line in FIG.
The original 50 is placed on the original table 22 without being
When the original 50 is inserted on the stationary plate 34, the original 50
The original reaches the document separation mechanism 60 beyond the lower end of the
The original stopper 84 operates because the originals may be fed multiple times.
The document 50 is positioned at the predetermined insertion position.
This is to confirm whether or not it has been set. Step S
4. If the stopper position detection means SW5 is not ON in
In this case, the document 50 reaches the document separation mechanism 60 and is double fed.
Because there is a risk, the operation does not shift to the original loading operation,
In step S5, the control unit 2 of the electrostatic copying machine 2 proceeds to step S5.
A jam alarm is displayed on the display means 230 via the display 10.
As a result, the original stopper 84 is positioned at the operation position.
The original 50 is placed on the original table 18 without being
Of the original generated by being inserted on the stationary plate 34
Double feed can be prevented beforehand. In step S4, the stopper position is detected.
The output means SW5 is ON, that is, the document stopper 84 is in the operation position.
If the control means 200 is positioned at
In step S6, the electric motor M2 is
Activate the tilting mechanism 100 and switch the electric motor M3
Drive to form the reversing roller 134 and the discharge roller 148.
Move and eject any misplaced documents on the transparent plate 8
To perform the following operations. Further, the control means 200 determines in step S6
At this point, the latch type solenoid SL2 is turned on.
Switch type solenoid when sucking the plunger.
To separate the plunger from the plunger
However, in the following description, the plunger is used for convenience.
ON when sucking in, and when separating the plunger
Is OFF. ). That is, the latch type solenoid SL2
The plunger is sucked and the document stopper 84 is moved to the position shown in FIG.
To the retracted position indicated by the solid line. In this way,
Motor M2, electric motor M3 and latch type solenoid S
While activating L2, the control means 200 sets the timer T to
Set to T1. The set time T1 is, for example, 100
msec. Next, the control means 200
The elapsed time T0 after setting the time T to T1 is set
Check whether time T1 has been reached (step S
7) If the elapsed time T0 has not reached the set time T1,
If so, the process proceeds to step S8, and the stopper position detecting means SW
5 is OFF, that is, the document stopper 84 is
To check if it is positioned at the evacuation position indicated by the solid line.
Admit. In step S8, the stopper position detecting means S
If W5 does not turn OFF, the process returns to step S7,
Check until the overtime T0 reaches the set time T1.
The stopper position detecting means even after the set time T1 has elapsed.
If the switch SW5 is not turned off, the control means 200 returns to the
The operation of the article loading means 33 is prohibited, and the process proceeds to step S9.
Document stopper 8 via control means 210 of electrostatic copying machine 2
4 is displayed on the display means 230 indicating that it is abnormal. this
The operator configures the stopper driving means 87 by the abnormal display.
Latch type solenoid SL2 or link mechanism 88 malfunctions
You can know what you are doing. Note that the step
In S8, the stopper position detecting means SW5 is turned off.
If so, the process proceeds to step S10 shown in FIG.
And further proceeds to step P0, where the primary
Execute the routine. Next, a subroutine for primary paper feeding shown in FIG.
Will be described. The control means 200 proceeds to step P1.
To turn on the electric motor M1 of the document carrying means and drive it.
And presses the pressure plate 48 by urging the solenoid SL1.
Placed on the document table 22 and inserted on the stationary plate 34
The document acts on the upper surface of the document 50 and presses the document. others
When the electric motor M1 is driven,
When the roller 40 is driven to rotate, the forward feed roller 40 and the lowermost
To the frictional conveyance force generated at the contact portion with the lower surface of the original 50
Therefore, the original 50 is sent out toward the original separating mechanism 60.
You. When the electric motor M1 is driven,
Paper feed roller that constitutes the document separation mechanism 60 together with the
Roller 64 and the drive roller 67 of the separation belt mechanism 66
The document separation mechanism 60 is operated. Previous
The front end of the original fed by the front feed roller 40 is
When it reaches the drive roller 67 of the document separation mechanism 60, the drive roller
Roller 671 is provided on the side of the roller 671
It comes into contact with the regulating portion 672. At this time, the advance roller 40
Or the lowermost document 50 whose lower surface is frictionally driven by
The lower several sheets are further conveyed toward the paper feed roller 64.
However, the originals 50 other than the lowest one are
Due to the action of the regulating portion 682 of the rotating drive roller 68,
Thus, movement toward the paper feed roller 64 is restricted. Soshi
The document conveyed toward the paper feed roller 64
Paper feed roller 6 rotating in the transport direction even if there are multiple sheets
4 and the separation belt 69 moving in the opposite direction to the transport direction.
Only the lowest document is transported.
It is sent to the entrance 98. In this way, the manuscript table
When the original 22 is sent to the original loading path 98, the control means 20
0 indicates whether or not the detector SW6 has been turned on, that is, the document loading path.
Whether the leading edge of the original sent to 98 reaches the detector SW6
It is checked whether or not it is (step P2). To step P2
If the detector SW6 is not ON, wait until the detector
If SW6 is turned on, the control means 200 sets the timer T to T
Set to 2 (step P3). This set time T2
Is set to, for example, 25 msec. Next, the control hand
Stage 200 is the time elapsed since timer T was set to T2.
Check whether or not T0 has reached the set time T2.
Step P4) When the elapsed time T0 reaches the set time T2
If not, the conveyance of the document is continued and the elapsed time T0
Has reached the set time T2, the process proceeds to Step P5.
To turn off the electric motor M1 and the solenoid SL1.
To stop the document feeding operation. With this primary paper feed operation
The original is moved by the advance roller 40 and the original separating mechanism 60.
The document fed to the carry-in path 98 has its front end inactive.
Contact the nip of the pair of registration rollers 114
And the primary paper feed ends. Returning again to the main routine shown in FIG.
When the primary paper feeding is completed as described above, the control means 20
0 goes to step Q0 to execute the subroutine for secondary paper feeding
I do. Subroutine for secondary paper feeding based on FIG.
explain. The control means 200 determines whether the registration
The electric roller attached to the drive roller 116 of the stroller pair 114
The magnetic clutch CL1 is turned on and energized. Electromagnetic clutch C
When L1 is energized, the electric motor M2 is already driven forward.
The driving roller 11 of the registration roller pair 114
6 is driven to rotate. Therefore, the primary paper
To the nip of the pair of registration rollers 114
Original extends along the transparent plate 8 of the electrostatic copying machine 2.
The document is conveyed toward a document conveying path 108
Of the transparent plate 8 by the transport belt mechanism 100 constituting
2 From left (one end) to right (other end)
Transported. Next, the control means 200
Detector SW6 arranged in document loading path 98 in Q2
Is turned off, that is, the trailing edge of the document activates the detector SW6.
Check whether it has passed, and turn off the detector SW6.
If not, wait until the detector SW6 turns off.
Judge that the rear end has passed detector SW6 and step
Proceeding to Q3, the control unit 210 of the electrostatic copying machine 2
Check whether a picture signal is being sent. This two-sided copy
The signal is sent from the operator by means of the key 220
Input to the control means 210 of the electrostatic copying machine 2 by the
From the control means 210 to the control means 20 based on the input signal of
Sent to 0. In step Q3, a double-sided copy signal is
If so, the process proceeds to step R0, where the reverse sheet feeding subroutine is performed.
Execute This subroutine for reverse feeding will be described later.
Will be described. When there is no double-sided copy signal in step Q3
Proceeds to step Q4, where the electric motor of the conveyance belt mechanism 100 is
From the rotation amount detecting means FG2 mounted on the motor M2.
The counting of the signal PSB is started. In step Q4
And start counting the pulse signal PSB,
Proceeding to step Q5, the control means 200 outputs the pulse signal PSB.
It is checked whether the set pulse number PS1 has been reached. This
From the detector SW6 in FIG.
The document transport distance up to the document set reference position G
Is the number of pulses corresponding to the rotation amount of the electric motor M2.
In step Q5, the pulse signal PSB is equal to the set number of pulses.
If the signal does not reach PS1, the transfer is continued after waiting.
When the signal PSB reaches the set pulse number PS1, the original
Judging that the rear end has reached the original set reference position G,
Proceed to step Q6 to turn off electric motor M2 and convey
The operation of the belt mechanism 100 is stopped. At the same time, the electromagnetic
The clutch CL1 is turned off and the rotation amount detecting means is
Clear the count of the pulse signal PSB from FG2
You. Next, the control means 200 returns to step Q7.
Of the pulse signal PSB from the rotation and rotation amount detecting means FG2.
Start This is done by turning off the electric motor M2
Also, the drive shaft of the electric motor M2 does not stop immediately, but
This is because they rotate slightly. Therefore, this inertial force
The trailing edge of the document is rotated by the
The position overrun ahead of G, that is, in FIG.
Is conveyed to the right of the original set reference position G and stopped.
That is, the transport amount (overrun amount) is detected.
That's why. In step Q7, the rotation amount detecting means FG
If the counting of pulse signal PSB from 2 is started
The control means 200 controls the pulse from the rotation angle detection means FG2.
Signal PSB has become zero (0), that is,
It is confirmed whether the data M2 has stopped reliably (step Q
8). In step Q8, the rotation amount detection means FG2
It has been confirmed that the pulse signal PSB has become zero (0).
If so, the process proceeds to step Q9, where the control means 200
When the motor M2 has stopped reliably, that is, the rotation amount detecting means FG
Until the pulse signal PSB from 2 becomes zero (0)
Exceeds the pulse number PS2 from the rotation amount detection means FG2
Random access memory (RAM) 20 as run amount
3 and the path from the rotation amount detecting means FG2.
The count of the loose signal PSB is cleared. Next, the control hand
The stage 200 switches the electric motor M2 in step Q10.
When the transport belt mechanism 100 is operated in reverse by driving in the reverse direction,
The rotation amount detecting means FG2 attached to the electric motor M2
Start counting of pulse signal PSB from
You. In step Q10, the rotation amount detecting means FG2
When counting of the pulse signal PSB starts,
Proceeding to step Q11, the control means 200 outputs the pulse signal PSB.
The number of pulses PS2 corresponding to the overrun amount has been reached.
Check whether or not. Pulse in step Q11
Number of pulses PS2 corresponding to signal PSB corresponding to overrun amount
If the pulse signal PS does not reach
B reaches the pulse number PS2 corresponding to the overrun amount
If so, the trailing edge of the document reaches the document set reference position G
The process proceeds to step Q12, and the electric motor M2
Is turned off to stop the operation of the transport belt mechanism 100.
The control means 200 is a control means 210 of the electrostatic copying machine 2.
Output a print signal, that is, an exposure start preparation complete signal.
Power. Next, the reverse sheet feeding subroutine shown in FIG.
The reverse sheet feeding operation will be described based on FIG. Control means 20
0 turns on the electric motor M3 in step R1 and
The roller 134 is driven to rotate, and the branching control is performed.
The solenoid SL3 for controlling the operation of the plate 144 is turned on and
Energize. When the solenoid SL3 is energized, the branch control plate 1
44 is positioned at the position shown by the two-dot chain line in FIG.
Therefore, the transport belt mechanism 100 and the reversing roller 134
Therefore, the conveyed document is a document formed on the transparent plate 8.
The transport path 108 is shifted from the left side (one end) to the right side in FIG.
(The other end), and further, a first document discharge path.
The document is sent to the document reversing path 142 through 130. like this
To move the document to the document reversing path 142.
Control when the motor M3 and the solenoid SL3 are actuated.
The means 200 includes a document detector S disposed in the reversing path 142.
W8 is ON or not, that is, the front end of the original is detected by the original detector S
It is checked whether or not W8 has been reached (step R2).
If the document detector SW8 is not turned on, the process waits, and the detector SW8
If it is turned on, the process proceeds to step R3, where the transport belt mechanism
100 drive motor M2 in the reverse direction to drive the transport belt mechanism
100 is operated in reverse and the reversing roller 134 is driven.
Rotation amount detecting means FG3 attached to the electric motor M3
The counting of the pulse signal PSC is started. Step
The pulse signal from the rotation amount detecting means FG3 in the step R3
If the PSC has begun counting, proceed to step R4
The control means 200 determines that the pulse signal PSC is
Check whether S3 (first predetermined transport amount) has been reached
You. The set pulse number PS3 is determined by
After the electric motor M2 is driven in reverse rotation,
By the reversing roller 134, which corresponds to the time until it becomes stable
It is set to the document conveyance amount (number of pulses). in this way
The document transported by the reversing roller 134 is
2 is introduced to the right side (the other end) in FIG.
Conveyed to the left (one end) by the feeding belt mechanism 100
Is done. In step R4, the pulse signal PSC is set
If the pulse number PS3 has not been reached, wait until the pulse signal PS
If C reaches the set pulse number PS3, step R5
To the positive position of the electric motor M2 of the conveyor belt mechanism 100.
When the electric motor M2 starts
The pulse signal PS from the mounted rotation amount detecting means FG2
B count starts counting. In addition,
Is controlled by the conveyor belt mechanism 100
The front end of the document approaches the document set reference position G in FIG.
If the rotation speed of the electric motor M2 is reduced,
PSB reaches the set number of pulses PS4 (second predetermined transport amount)
When the electric motor M2 is turned off, the
Overruns the original set reference position G due to inertial force.
Is to control it. Pulse signal PSB
If the counting has begun, the process proceeds to step R6 and the control means
200 indicates that the pulse signal PSB has the set number of pulses PS4 (second
(The predetermined transport amount) is checked. This setting
The constant pulse number PS4 is a count of the pulse signal PSB.
Before the document sent to the conveyor belt mechanism 100 at the start
The edge is set to the original setting reference by the conveyor belt mechanism 100.
The number of pulses corresponding to the amount of document transported to the position G
You. In step R6, the pulse signal PSB
If the number does not reach PS4, the transport is continued after waiting.
If the signal PSB reaches the set pulse number PS4,
Judge that the front end of the document has reached the document set reference position G
To step R7, and turn off the electric motor M2.
The operation of the transport belt mechanism 100 is stopped. At the same time,
When the electric motor M3 is turned off,
The operation of the delivery roller 148 is stopped, and the solenoid
The idling SL3 is turned off and deenergized, and the branch control plate 144 is moved to FIG.
At the position indicated by the solid line. Control means
Reference numeral 200 denotes a printer to the control unit 210 of the electrostatic copying machine 2.
Output signal, that is, an exposure start preparation completion signal. Next, returning to the main flow of FIG.
You. Primary feed subroutine P0, secondary feed as described above
Execute subroutine Q0 and reverse paper feed subroutine R0
If the control has been performed, the control means 200 proceeds to step S11.
Whether the document set switch SW4 is ON,
Check if any manuscript remains on manuscript table 22
You. When the document set switch SW4 is ON
Means that the control means 200 sets the document flag (step S1
2) The primary paper feed subroutine P0 is executed again. What
This primary paper feed subroutine P0
This is performed while the conveyed document is being exposed. This
Again when the primary paper feed subroutine P0 is executed again.
The control means 200 proceeds to step S13 as shown in FIG.
A document exchange signal is sent from the control means 210 of the electrostatic copying machine 2.
Check if it has been sent. This document exchange signal
When the exposure of the original previously conveyed on the transparent plate 8 is completed
Sent from the control means 210 of the electrostatic copying machine 2 to the control means 200
Can be If there is a document exchange signal in step S13,
In this case, the process proceeds to step S14, in which the electric motor M2 is rotated forward.
Drive to operate the transport belt mechanism 100, and
The driving motor M3 is driven to rotate the reversing roller 134 and the discharging roller.
The roller 148 is driven to rotate on the transparent plate 8 where the exposure is completed.
The document is discharged. This discharge operation completes the exposure.
The completed document on the transparent plate 8 is placed on the transparent plate 8 in FIG.
The document is conveyed rightward and further passes through the first document output path 130.
Then, the document is conveyed to the second document discharge path 140. Electric motor
M2 and the electric motor M3 are driven to discharge the original.
When started, the control means 200 proceeds to step S15 and
The document detector SW7 disposed in the document output path 140 of the second
Whether it is turned on once and then turned off, that is, the second original transport
The trailing edge of the document conveyed to exit 140 passes through detector SW7.
The original detector SW7 checks whether or not the
If it is not OFF after N, the document detector SW
If 7 turns on once and then turns off, the trailing edge of the original
When it is determined that the document has passed the document detector SW7, the control means 200
Proceeds to step S16 and sets the timer T to T3
You. The set time T3 is such that the trailing edge of the document is
From passing W7 to passing the discharge roller 148.
The time is set to, for example, 100 msec. Stay
If timer T is set to T3 in step S16
The control means 200 proceeds to step S17 and proceeds to the rear end of the original.
Is set as the elapsed time T0 after the document has passed the document detector SW7.
It is checked whether the fixed time T3 has been reached or not, and the elapsed time T0
If the time has not reached the set time T3, the document discharge operation continues.
If the elapsed time T0 reaches the set time T3,
Judge that the rear end has passed the discharge roller 148 and
Proceed to step S18, turn off the electric motor M3,
The operation of the roller 134 and the discharge roller 148 is stopped.
Exposure completed in this way from the discharge roller 148
The document is discharged onto a document discharge tray 20. Next,
The control means 200 proceeds to step S19 and sets the document flag.
Check whether the document is standing
If the next document has already completed primary feeding,
Then, the process proceeds to the secondary paper feed subroutine Q0. Ma
The document flag is not set in step S19.
In this case, the process proceeds to step S20, where the primary fed document is
It is determined that there is no
The operation of the tilting mechanism 100 is stopped. Then, the control means 2
00 returns to the step S1 and executes the respective steps
I do. In step S13, a document exchange signal is output.
If not, the process proceeds to step S21, where the double-sided copy signal
Check whether a double-sided copy signal is sent.
If not, the process returns to step S13, and double-sided copying is performed.
If the image signal has been sent, the process proceeds to step S22,
The electric motor M2 of the transport belt mechanism 100 is driven to rotate forward.
And an electric motor M3 for driving the reversing roller 134.
Is turned on, and the process proceeds to the reverse sheet feeding subroutine R0. Note that, in step S11 in FIG.
If the document set switch SW4 is not turned on
If the original to be copied remains on the original table 22
It is determined that there is no document, and the process proceeds to step S23, where
And the latch type solenoid SL2 is
FF, move the plunger in the direction to separate it, and
3 is positioned at the operation position shown by the two-dot chain line in FIG.
wear. At the same time, the control means 200 controls the stopper driving means 8
Latch Solenoid SL2 and Link Machine Constituting No. 7
Set timer T to T4 to diagnose failure of structure 88
I do. This set time T4 is set, for example, to 100 msec.
Is defined. Next, the control means 200 sets the timer T.
Whether the elapsed time T0 after the reset has reached the set time T4
It is checked whether or not the elapsed time T0 has elapsed (step S24).
If the set time T4 has not been reached, step S25
To determine whether the stopper position detecting means SW5 is ON or not.
The action of the original stopper 84 indicated by a two-dot chain line in FIG.
Check if it is positioned in the position. Steps
In S25, the stopper position detecting means SW5 is turned on.
If not, the process returns to step S24, and the elapsed time T0 is
Check until the set time T4
Stopper position detection means SW5 is ON even after T4
If not, the process proceeds to step S26, where the document stopper
The display means 230 displays that 84 is abnormal. This
Is displayed, the operator operates the stopper driving means 87.
Latch type solenoid SL2 or link mechanism 88
We can know that we are obstructed. The automatic document feeder according to the present invention has the above
Belt machine configured as a document separation mechanism
The mechanism includes a first roller disposed on the upstream side in the transport direction and the first roller.
The first roller is disposed downstream of the first roller in the transport direction with an interval.
A second roller, the first roller and the second roller,
And a separation belt wound around the first row.
The roller unit is attached to the side of the roller unit
With a regulating part whose diameter is larger than the sum of the outer diameter of
Between the lowermost end of the large diameter regulating portion and the upper surface of the lower guide plate.
A predetermined gap is formed in the document separation mechanism.
The front edge of the original conveyed by the first roller is
The abutment is in contact with the regulation
Most of them restrict the movement to the downstream side by the action of the control section
Is done. For this reason, between the paper feed roller and the separation belt,
Is sent to the lowermost document or lower one or two
Pages, so the frequency of rubbing between the pages is reduced.
Slightly reduce document contamination due to rubbing between documents.
Can be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a state in which a preferred embodiment of an automatic document feeder configured according to the present invention is mounted on an electrostatic copying machine. FIG. 2 is a schematic sectional view of the automatic document feeder shown in FIG. FIG. 3 is an enlarged cross-sectional view showing a loading unit of the automatic document feeder shown in FIGS. 1 and 2; FIG. 4 is an exploded perspective view of the loading means shown in FIG. 3; 5 is an exploded perspective view of a conveyance belt mechanism and a document reversing / discharging unit of the automatic document conveyance device shown in FIGS. 1 and 2. FIG. FIG. 6 is a block diagram showing a configuration of a control unit provided in the automatic document feeder shown in FIGS. 1 and 2; 7 shows a processing procedure of the control means shown in FIG. 6,
9 is a flowchart showing a part of a main routine. 8 shows a processing procedure of the control means shown in FIG. 6,
9 is a flowchart showing a part of a main routine. 9 shows a processing procedure of the control means shown in FIG. 6,
9 is a flowchart showing a part of a main routine. FIG. 10 is a flowchart showing a processing procedure of a control unit shown in FIG. 6, and showing a subroutine for primary paper feeding. 11 is a flowchart showing a processing procedure of the control means shown in FIG. 6, and showing a subroutine for secondary paper feeding. 12 is a flowchart showing a processing procedure of the control means shown in FIG. 6, and showing a subroutine of reverse sheet feeding. [Description of Signs] 2: Electrostatic copying machine 4: Automatic document feeder 6: Housing of electrostatic copying machine 8: Transparent plate 10: Document regulating member 18: Document placing means 20: Document discharge tray 22: Document table 33 : Document feeding means 38: Forward feeding means 40: Forward feeding roller 44: Forward feeding pressing means 48: First pressing plate 49: Second pressing plate 59: Document regulating plate 60: Document separating mechanism 64: Feeding roller 66: separation belt mechanism 67: drive roller 68: driven roller 69: separation belt 78: drive means 84: document stopper 87: stopper drive means 98: document carry-in path 100: transport belt mechanism 102: drive roller 104: driven roller 106: Endless belt 108: Document conveying path 114: Registration roller pair 116: Driving roller 118: Driven roller 120: Driving means 128: Document reversing / discharging means 130: First original Document discharge path 134: reversing rollers 135a, 135b, 135c: driven roller 140: second document discharge path 142: reversing path 144: branch control plate 148: drive roller 150: driven roller 152: discharge roller pair 162: driving means 200 : Control means 210: control means 220 of electrostatic copying machine 2: operation means 230: display means 641: roller section 671: roller section 672: regulating section 681: roller sections M1, M2, M3: electric motors FG1, FG2, FG3. : Rotation amount detecting means SL1: Solenoid SL1: Latch type solenoid SL3: Solenoid CL1: Electromagnetic clutch SW1, SW2, SW3: Safety switch SW4: Original set switch SW5: Stopper position detecting means SW6, SW7, SW8: Reflective optical original Detector

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masanori Yamaoka 1-2-28 Tamazo, Chuo-ku, Osaka-shi Inside Mita Kogyo Co., Ltd. (56) References JP-A-52-9268 (JP, A) JP-A-56-56444 (JP, A) JP-A-63-136639 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B65H 3/52

Claims (1)

(57) [Claims] An original table on which an original is placed;A lower guide plate disposed downstream of the document table; An upper part arranged at a predetermined interval above the lower guide plate
Side guide plate, Pre-feeding means for feeding out a document placed on the document table
When,From the lower side of the lower guide plate on the downstream side of the advance means.
Projecting upward through an opening provided in the lower guide plate.
A paper feed roller disposed and rotated in the transport direction;
The opening provided in the upper guide plate from above the upper guide plate
Disposed opposite to the paper feed roller through
Having separation belt mechanism actuated in one direction
Separation mechanism, In the automatic document feeder having The separation belt mechanism includes a first belt mechanism disposed on the upstream side in the transport direction.
Between the first roller and the first roller in the transport direction.
The second roller, the first roller and the
A second roller and a separation belt wound around the second roller.
And The first roller is a roller unit on which the separation belt is mounted.
And an outer diameter of the roller portion provided on a side of the roller portion.
With a regulation part with a diameter larger than the sum of the thickness of the separation beltYou
Between the lowermost end of the large diameter regulating portion and the upper surface of the lower guide plate.
A predetermined gap is formed between them, An automatic document feeder, characterized in that: