JPS58157652A - Automatic document feeder - Google Patents

Abstract

PURPOSE:To provide an automatic document feeder which includes at least more than two document standby portions, from which documents are supplied independently, so that an interrupt supply of a document can be facilitated. CONSTITUTION:An automatic document feeder 4 is adapted to automatically feed and discharge a document P to and from a document table 2. One side portion of the feeder 4 is provided with an inlet guide 5 for supplying the document P manually functioned as a single sheet document standby portion, which is open at the upper portion thereof and U-shaped in section. A cassette 6 functioned as a stacked documents standby portion for continuously supplying a lot of documents P is detachably mounted above the guide. A supply mechanism 7 for supplying the document P onto the document table from the inlet guide 5 or the cassette 6 independently is mounted in the interior of the feeder 4. The supply mechanism 7 comprises the first and second paper feed mechanisms 8, 9. Thus, an interrupt supply of a document can be facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an automatic document feeder that automatically feeds a document to, for example, a document table of an electronic copying machine. [Technical Background of the Invention and Problems thereof] For example, automatic document feeders used in electronic copying machines,
It is placed on the document table, and the document set in the document special unit is automatically sent onto the document table.

However, since the above device has only one special document unit, if it is necessary to copy another document before the original after setting the document in the special document unit, the original The operation was troublesome as it was necessary to remove the original set in the special equipment section and set another original.

[Purpose of the invention]

The present invention has been made based on the above-mentioned circumstances, and an object thereof is to provide an automatic document feeder that can easily perform interrupt feeding of documents.

[Summary of the invention]

According to the present invention, at least two or more original special equipment units are provided, and originals are supplied independently from these original special equipment units.

[Embodiments of the invention]

The present invention will be described below with reference to an illustrated embodiment. Reference numeral 1 in FIGS. 1 to 3 indicates the main body of the electronic copying machine. On the upper surface of this main body 1, a document table 2 as a supplied part is provided, and an exposure lamp 8'' is provided inside the main body 1. An exposure system 3 etc. consisting of an IA and the like is provided to expose the original P on the original platen 2. Further, an automatic document feeder 4 is provided on the upper part of the original platen 2 so as to cover the upper surface thereof and can be opened and closed. The automatic document feeder 4 is for fully automatically feeding and ejecting documents to and from the document table 2, and has a cross-sectional top with an open top on the negative side for feeding the document P manually. A population guide 5 is provided as a character-shaped single-sheet original special unit, and a large number of originals P...
A cassette 6, which serves as a stacked document special unit for continuously supplying documents, is removably installed. Further, inside the automatic document feeder 4, there is provided a supply mechanism 7 that supplies the document P onto the document table 2 independently from the entrance guide 5 and the cassette 6, which is connected to the first and second The paper feeding mechanism 8 and 9 are comprised of paper feeding mechanisms 8 and 9.

The first paper feeding mechanism 8 is configured as follows. That is, a first guide path 10 guides the document P manually fed from the entrance guide 5 to the document table 2, and is composed of a lower guide 1 and an upper guide 12 arranged in parallel. . A feed switch 13 is still provided on the entrance guide 5 side of the first guide path 10, and this detects that the document P has been carried into the first guide path 10 and activates the electromagnetic clutch 14. It is designed to be intermittent. The electromagnetic clutch no. 4 transfers the driving force transmitted from the drive element (not shown) in the main body 1 to the sprocket no. 5 and the gears 16 and 17f to the bevel gear 1.
8 and causes the aligning roller 19 to rotate. The center axis of rotation of the aligning roller 19 is installed at an angle of, for example, 10 degrees with respect to the stopper 2 of the first guide path 10, and the buffer horn roller is biased by a not-shown suffix ring. 20 through the first guide path 10f.

Then, the document P is conveyed in the tilting direction together with the buffer horn roller 20, and its leading edge is brought into contact with the first stocker 21, thereby aligning the document P. The first stopper 21 temporarily stops the document P conveyed by the aligner 219 to align it, and is operated by a solenoid 22. When the solenoid 22 is demagnetized, it protrudes toward the document table 2 side of the first guide path io, and when it is energized, it retreats from the first guide path 1θ. There is a start switch 2 between the upper part of the first guideway 1o and the first stopper 2.
3 is provided, which detects the document P conveyed by the aligning roller 19 and activates the solenoid 22.
The electromagnetic clutch 24 is made to continue operating while energizing the electromagnetic clutch 24. The electromagnetic clutch 24 transmits a driving force transmitted from a drive element (not shown) provided in the main body 1 via a sprocket 15 to a gear 26 and a bevel gear 27.
The drive rollers 28 attached to the conveyor belts 29 are rotated to run the conveyor belts 29. The conveyor belt 29... is stretched between the driving roller 28... and the driven roller 3°... so as to run endlessly, and the inside of the tension roller 3/roller 3... and i... 73
Appropriate tension is applied by 2..., and the document table 2 faces the document table 2 with a predetermined gap therebetween. Then, the original P sent from the first guide path 10 is
The document is conveyed 6- along the document table 2. In addition, the conveyor belt 29...
A guide 33..., a weight roller 34... are provided on the inner circumferential side of the
and guides 35 are arranged so that the document P can be smoothly transported by the transport belts 29. In addition, a glass fix 36 is provided on the end surface of the document table 2 that faces in the direction in which the document is conveyed by the conveyor belt 29 . It is something. Further, a second stopper 37 that can be protruded and retracted is provided on the discharge side of the document table 2, and stops the document P conveyed by the conveyor belt 29 in a predetermined position on the document table 20. It is designed to block its tip to allow it to move. moreover,
On the discharge side of the conveyance belt 29, that is, the portion wrapped around the drive roller 28, there is a paper discharge roller 38.
. . . are in rolling contact with each other, and together with the conveyance belt 29 . Note that 40 is a paper ejection switch provided between the second stock stop 37 and the paper ejection roller 38, and is configured to detect that the original P is ejected from the original platen 2. ing.

The second feed mechanism 9 is as follows. That is, in the cassette 6, the document side regulating plate 4 is placed in the document P.
It is provided so that it can be slid according to its size. Further, a back-up plate 42 is provided in the cassette 6 at 1 and 1, and this is used to store the originals.
... is housed in the cassette 6 is detected by the document detection switch 43.
The document P in the cassette 6 is pushed up by
... is pressed against the take-out roller 45. That is, as shown in FIG. 4(a), the document detection switch 43 is arranged so that the detection piece 46 protrudes into the cassette 6 and is prevented from hitting the back-up plate 42 and the push-up lever 44. Figure 4 (b)
), when a document P is stored in the cassette 6, it comes into contact with the topmost document P, and in this state, the fourth document P is placed in the cassette 6.
As shown in FIG. 4(c), it moves together with the push-up lever 44, and as shown in FIG. It has become. In addition, the above push-up・9-4
4 is a rotating shaft 48 of a drive motor 47, as shown in FIG.
A worm wheel 50 that meshes with a worm 49 attached to the worm wheel 50 is fixed to a transmission shaft 5 rotatably supported. A push-up lever 52 is fixed to the transmission shaft 5, and when the push-up lever 52 is biased by a push-up spring 53, the push-up lever 44 is moved in the direction of pushing up the pull-up plate 42. It is designed to be biased to rotate. Further, a locking lever 54 is rotatably attached to the transmission shaft 51. This locking lever 54 is fixed to the worm wheel 50 by a fixing screw 55 and rotates integrally with the worm wheel 50. Further, the locking lever 54 is designed to have an elongated size 56 through which the fixing screw 55 is inserted, so that the phase with respect to the worm wheel 50 can be adjusted. moreover,
The locking lever 9=54 is adapted to restrict the rotation range of the push-up lever 44 by an engaging protrusion 57 that engages with the upper d-pi push-up lever 52. Then, the document detection switch 43 detects the document P.
When detected, the drive motor 47 rotates and fully rotates the locking lever 54 together with the worm wheel 50 via the worm 49. In addition, as the push-up rod 52 rotates while being locked by the locking lever 54, the push-up lever 44 rotates via the transmission shaft 5. And,・9
By pushing up the pickup plate 42, the cassette 6
The uppermost document P is pressed against the take-out row 245, and in this way, the automatic document take-out standby state is established. At this time, the locking lever 54 continues to rotate further from this state, the locking lever 54 and the push-up rod 52 are released from each other, and the push-up lever 44 moves the last document
When the push-up lever 44 is rotated to change the rotation restriction range at mt such that it can be pressed against the take-out roller 45 until
This is detected by the upper limit detection switch 58 and the drive motor 47 is stopped. It should be noted that when the document image IIJJ is in a standby state for removal, a display lamp 82 provided on the main body 1 lights up. Further, the take-out rollers 45 . . . start the original take-out operation by operating a take-out start switch 59 provided on the main body 1 during automatic document take-out standby. That is, the ejection start switch 59
When the clutch solenoid 60 is operated, the clutch solenoid 60 is energized and the spring clutch 61 is kept in operation. This spring clutch 6 is connected to a sprocket 15, a gear 16.
17 and sprocket 62. The driving force is transmitted to the drive shaft 63. A sprocket 65 incorporating a one-way clutch 64 is attached to the drive shaft 63, and the driving force of the drive shaft 63 is transmitted to the take-out roller 45 via a ladder chain 66 and a sprocket 67. Then, this take-out roller 45... is operated by the document p(
It is designed to feed between the i-feed rollers 68 . . . , the auxiliary rollers 69 .

The feed roller 68 is made of a rubber material with a large frictional force, and the driving force of the drive shaft 63 is attached to a sprocket 72 having a built-in one-way clutch 71.
, through the ladder chain 73 and sprocket 74, and rotate in synchronization with the take-out rollers 45. The auxiliary rollers 69 are made of nylon resin having an extremely small coefficient of friction, and are in rolling contact with the feed rollers 68. 1st I Separation Club Month 70 is the 6th
As shown in the figure, for example, hard j1 has an extremely high coefficient of friction.
The first feed guide 75 is made of silicone/rubber material with a diameter of 7° and has an arcuate cross section, and is located between the auxiliary rows 269...
The central portion of the circular arc surface protrudes between the feed rollers 68 . . . . As shown in FIG. 7, this separation member 70 may be adhered to the first feed guide 75 using a double-sided tape or the like, and as shown in FIG. ...The protruding needle between the two may be adjustable. Then, the feed roller 68..., the auxiliary roller 69...
The separating member 70 separates the documents P sent by the take-out rows '745 one by one and transfers them to the second guide path 7.
7 into the first guide path 10. The second guide path 77 is connected to the first feed guide 75.
and the second feed guide 978 to form a width of about 2 mm. Further, a mylar sheet 79 having a small friction coefficient is attached to the inside of the second feeding guide 72, and this mylar sheet 79 makes it easy to feed the document P.

Furthermore, the first and second paper feeders 1r configured in this manner
The supply mechanism 7 consisting of is t 9 is as follows. That is, the aligning roller 19 detects the document P having the maximum allowable length by the feed switch 13, and
Furthermore, after the start switch 23 detects its leading edge, the rear end thereof is rotated until a predetermined time has elapsed since the start switch 13 detects its leading edge, and the document P (f) is fed onto the document table 2. In addition, the above-mentioned take-out roller 45...
When the feed switch 13 detects the trailing edge of the document P,
If the document detection switch 43 detects the document P, a signal is given to the clutch solenoid 60 to take out the next document P from the cassette 6. Furthermore, manual document feeding, that is, supplying the document P from the entrance guide 5, and automatic document feeding, that is, feeding the document P from the cassette 6.
The supply of the original P from the main body 1 is selected by a changeover switch 80 provided on the main body 1. Further, this changeover switch 80 is configured to stand by in a state in which manual manual feeding of the original is possible while the original detection switch 43 detects that there is no original.

FIG. 9 shows an electric circuit, in which the output of the document take-out start switch 59 is supplied to the set input terminal of a flip-flop circuit (hereinafter abbreviated as FF circuit) 10;
The set output of the F circuit 101 is supplied to the first input terminal of the unr+i+ path 1θ2. The output of the AND circuit 102 is the driver 1θ
3, and this driver 103 drives the clutch solenoid 60. Still, the output of the AND circuit 102 is supplied to an inverter 704, and the output of this inverter 104 is supplied to one input terminal of the AND circuit 105 and the mono-multivibrator 106.

The output of the mono-multivibrator 106 is supplied to the other input terminal of the AND circuit 105, and the output of the AT circuit 105 is supplied to the first input terminal of the OR circuit 107.

The output of the OR circuit 107 is supplied to the second input terminal of the OR circuit 107, and the output of the OR circuit 107 is supplied to the reset input terminal of the FF circuit 10.

The output of the document detection switch 43 is also supplied to the second input terminal of the AND circuit 102 and the set input terminal of the FF circuit No. 09. The set output of this FFj possible M1θ9 is supplied to a driver 11θ, and this driver 110 drives the motor 47.

Further, the output of the document detection switch 43 is supplied to one input terminal of the AND circuit 11.

The output of this AND circuit 111 is supplied to a dryer driver 112, and this driver 112 operates the lamp 82. Note that the output of the above-mentioned upper level detection switch 58 is supplied to the reset input terminal of the above-mentioned FF circuit 109 and the other input terminal of the AND circuit 111.

The output of the feed switch 13 is the rising edge detection circuit 11
3 to the FF circuit 1140 set input terminal. The set output of this FF circuit 114 is supplied to a driver 115, and this driver 115 drives the clutch 14. Further, the output of the feed switch 13 is supplied to the reset input terminal of the FFL path 114 via a fall detection circuit 116 and a mono multivibrator 117 in sequence. The output of the rising edge detection circuit 113 is also supplied to the set input terminal of the FF circuit 118, and the output of the two-way falling detection circuit 116 is also supplied to the reset input terminal of the F'F circuit 11B. be done. The reset output of the FFL path 118 is then output from the AND circuit 10.
2 is supplied to the third input end of 2.

The output of the start switch 23 is supplied to the set input terminal of the FF circuit 120 via the rising circuit 119. The set output of this FF circuit 120 is supplied to a driver 121, and this driver 12 drives the clutch 24. Incidentally, when the upper d self-rising circuit 1-9 outputs, a paper feed signal is generated.

Further, the output of the start switch 23 is supplied to the reset input terminal of the FF circuit 24 via a fall detection circuit 122 and a mono multivibrator 123 in sequence. The output of the feed switch 13 is supplied to the set input terminal of the OFF circuit 124 via the fall detection circuit 116. In addition, the output of the OFF circuit 1240 set 17- is supplied to the driver 125, and this driver 125
is for driving the solenoid 22.

8 is an exposure end switch that detects when the scanning by the exposure system 3 is completed (when the exposure lamp 8 is at the position indicated by the dotted line in FIG. 2), and this output is sent to the F"F circuit 12.
60 sets are supplied to the input terminal. The set output of this FF circuit 126 is supplied to a driver 127, and this driver knob 27 drives the stocker 37.

Further, - the output of the paper ejection switch 40 is the output of the FF circuit 1.
20 and the reset input terminal of the FF circuit 126. .

In addition, the above-mentioned Mono Multi Via 'Lz-1706.

117.123 outputs a signal after a predetermined time when a signal is input. Further, the FF circuit 118 is normally reset. Furthermore, the rise detection circuit 11
3,119 detects the rising edge of the mother pulse and outputs a signal, and the falling detection circuit 116,
12218- similarly detects the falling reno of the flat pulse.

Next, take out roller 45, feed roller 68, auxiliary roller 6
9 and the functions of the separation member 700 will be explained. Take-out roller 4
As shown in FIG. 1O, the original P sent from 5 runs on the separation member 70, and at least the part corresponding to the separation part paulownia 70 is lifted upward in the figure and guided, and the leading edge of the original P is guided by the separation member 70. It will be sent between the roller 68 and the auxiliary roller 69. When only the uppermost document P is taken out from the cassette 6 by the action of the take-out roller 45, the first
As shown in Figure 1, the upper surface of the document P receives a frictional conveying force of 4 μsW from the feed roller 68 (where μC is the friction coefficient between the feed roller 68 and the document P, and W is the contact pressure per feed roller 68). . The document P has an uneven wave shape due to the action of the feed roller 68, and the convex portion is caused by the pressing load W of the feed roller 68.
It receives a tension component W due to the action of . Further, the lower surface of the document P receives a restraining force of 2 μbw (where μb is the friction coefficient between the separation member 70 and the document P, and W is the tension component force due to the pressing load of the feed roller 68). Therefore, the original P is 4 μaW
−2/Jbw ) F (however, w = f (W)
, W<W, where F is the force necessary to transport the original P without causing it to slip). Next, when the take-out roller 45 comes into contact with the uppermost document P and takes it out, as shown in FIG. The contact pressure per direction is W', the friction coefficient between the take-out roller 45 and the uppermost original (first original @) Pl is μC, and the first original pl and the next original (second original) are The friction coefficient between the second original P2 and the next original (third original) Pal is μpI), the third original P3 is the friction coefficient between the second original P2 and the next original (third original) Pal and the next original (this is the fourth original, and if the originals P1 + Pl r Ps l p4 are of the same type and in the same stacked state, μpI = μp2 - μ
It becomes p3. Furthermore, assuming that the document take-out direction is positive, the first document P1 is +2 μCW due to the action of the take-out roller 45.
By receiving the extraction force of ' and the restraining force of -μpIW', it is conveyed with a combined force of +2μcW'-2μplW'. Similarly, the second document P2 is +2μcW' -2μp
With a force of 1W' -2μp x W', the third document P
3 is +2μCW'-2μp, w'-2μp2W'-
Each is transported with a force of 2μp3W'. Here, μC
>μp1, and the documents P in the cassette 6 are taken out after being shifted in a stepwise manner. At this time, μ
The larger the difference between C and μPI and the smaller W' is, the smaller the amount of deviation after the second sheet, but in order to reliably take out the original P at 1>μc)0, there is a lower limit to the size of W'. There is.

Therefore, considering the case where the originals P are taken out in a stepwise manner with reference to FIGS. 11 to 15, the upper surface of the first original P1 is
W, the lower surface of which receives the restraining force of 2μp IW +2μI) Fl=4μaW -4μp+W-2tt
Transported by pswO force.

Furthermore, since the upper surface of the second original P2 is in contact with the first 21-th original P, it receives a conveying force of 4 μplW, and the lower surface of the second original P2 is in contact with the separation section 70, so it receives a conveying force of 2 μplW.
It is conveyed with a force of F 2 = 4μpI W - 21tbw under the restraining force of bw. If μb or W is determined so that Fl and 2F are obtained, it is possible to reliably separate the documents P taken out in a stepwise manner into single sheets.

Note that by selecting a rubber material as the separation member 70 and appropriately determining its hardness, μb can be determined as appropriate since it is a function of the emergency.

Next, the operation of this device will be explained with reference to FIG. 16. First, when the selector switch 80 is switched to automatic document feeding and documents P are stored in the cassette 6, the document detection switch 43 is turned on and the FF circuit 109 is set. As a result, the motor 47 rotates, and the push-up lever 44
22- Accordingly, the back-up plate 42 is pushed up, and the document P is pressed against the take-out roller 45. Then, the upper limit detection switch 58 is turned on, thereby resetting the FF circuit 109 and stopping the motor 47, and at the same time opening the at circuit 11 and lighting up the ready lamp 82.

Here, when the extraction start switch 59 is pressed, the FF circuit 10
is set, and a signal is output from the AND circuit 102 (at this time, the FF circuit 118 has been reset). As a result, the clutch solenoid 60 is energized, and the take-out roller 45 and the feed roller 68 start rotating. Then, the documents P are taken out from the cassette 6, separated one by one, and introduced into the first guide path 10 via the second guide path 77.

When the feed switch 3 detects the document P, the FF circuit 118 and the FF circuit 114 are set by a signal from the rising edge detection circuit 113.

As a result, the AND circuit Jθ2 is closed and the taking out of the document P is stopped, and the alignment roller 19 is rotated. Then, the document P is forwarded to the first position +21 and aligned. Further, at this time, when the original P passes through the feed switch 13 and a signal is output from the falling edge detection circuit 116, the FF circuit 118 is reset, thereby opening the AND circuit 102 and starting to take out the original P again. At the same time, the FF circuit 124 is set, which excites the solenoid 22 and opens the first stop horn 'e21.

After a while, it was monomartino! When a signal is output from the rotor 117, the FF circuit '@114 is reset and the aligner roller 19 is stopped.

At this time, the document P is detected by the start switch 23. Then, the output of the rising circuits 1 to 9 starts feeding paper in the nuclear copying machine, and the FF circuit 120 is set. As a result, the clutch 24 is energized and the conveyor belt 29 starts running. It's a reed, falling detection circuit 1
22 produces an output from the mono multi-noise ibrator 123, and the first stop switch 421 returns to the stop state.

Then, the original P is sent by the aligning horn 9 to the carry-in end of the conveyor belts 29, and is further sent to a predetermined position on the document table 2 by the conveyor belts 29, and is stopped. At this time, the original P is stopped by the second striker f37 and is accurately positioned at a predetermined position on the original table 2. Next, the original P is exposed by the exposure system 3.

When the exposure end switch 8 is turned on, the FF circuit 126 is set and the second switch 37 is opened. As a result, the original P is ejected.

When the discharge of the document P is detected by the paper discharge switch 40, the FF circuit 126 is reset and the stopper 37 is returned to its original position, and the FF circuit 120 is also reset and the conveyor belts 29... are also stopped.

Further, the FF circuit 10 is reset by the output of the OR circuit 07. This means that the document detection switch 43 is
Output from inverter ios when not detected, automatic → manual switching signal from changeover switch -25=80, and AND circuit 10
5 through the OR circuit 107.

Further, the signal from the AND circuit 105 is detected by the mono multivibrator θ6 and the inverter 104 when the extraction is not performed even after a certain period of time has passed after the completion of the extraction, and the FF circuit 10 is thereby reset. .

Next, when you want to interrupt another type of document P during automatic document feeding, switch 80fc from automatic to manual.
Other types of documents P are supplied from the entrance guide 5. Then, when all other documents P have been supplied, the changeover switch 80 is turned on again.
Switch from manual to automatic. In addition, in the case of manual feeding, the second
The paper feeding mechanism 9 is stopped, and the first paper feeding mechanism 8 operates in the same manner as in the case of automatic feeding.

According to the above configuration, since the entrance guide 5 and the cassette 6 are provided and the originals P are supplied independently from these, it is possible to easily interrupt the originals P.

26- Also, the document P from the entrance guide 5 is fed with priority over the cassette 6, that is, the changeover switch 80 is on standby in a state where the document can be manually fed while the document detection switch 43 detects that there is no document. This makes it possible to improve the operability when manually feeding the document P.

In addition, since the cassette 6 is removable, a large amount of original documents can be stored.
...can be easily set.

Furthermore, since the configuration is configured to detect the document P in the cassette 6 and make it possible to automatically take out the document, the document P...
After loading the cassette 6 containing the documents, automatic document retrieval can be started immediately, and operability can be further improved.

It should be noted that the present invention is not limited to the above-described embodiment, and for example, three or more document special parts may be provided, and all of them may be stacked document standby or single-sheet original special parts.

〔Effect of the invention〕

As explained above, according to the present invention, at least two or more special document units are provided and documents are supplied independently from these special document units, so that interruption supply of documents can be easily performed. It has excellent effects.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a partially cutaway perspective view, Fig. 2 is a longitudinal sectional front view, Fig. 3 is a cross-sectional plan view, and Fig. 4 (a) to (d). ) is a diagram for explaining the document detection process of the document detection switch, FIG. 5 is a perspective view showing the push-up/9- drive system, FIG. 6 is a perspective view showing the separation member, and FIG. 7 is the separation FIG. 8 is an explanatory diagram for installing the separation member, FIG. 9 is an electric circuit diagram, FIG. 10 is a perspective view to explain all the functions of the separation member, etc., and FIG. 11 is a side view. Fig. 12 is a rear view of the holder to explain the action of the take-out roller, Fig. 13 is a side view of the holder to explain the action of the separation member etc. when documents are sent in piles, and Fig. 14 is the same. The rear view, Figure 15, is also a longitudinal rear view, Figure 16.
The figure is a timing chart. P... Original, 4... Automatic document feeder, 5... Single-sheet original special unit (entrance guide), 6... Stacked J-shaped draft special unit (cassette), 7... Supply mechanism, 43... Original detection switch. Applicant's agent Takehiko Suzue 29- Figure 6 Japanese Unexamined Patent Publication No. 58-157652 (11) Figure 10 68 Figure 11 Figure 13 Figure 14 Figure 12 Figure 15

Claims (4)

[Claims] (1) An automatic document feeder characterized by comprising at least two or more special document parts that hold originals on standby, and a supply mechanism that independently supplies the originals from these special parts to a supplied part. (2) The document special device section has a stacked document special device section and a single sheet Wt document waiting section, and the supply mechanism has a detection means for detecting that no document exists in the stacked document special device section. death,
2. The automatic document feeder according to claim 1, wherein the automatic document feeder is configured to feed the document from the single-sheet document special unit with priority based on the signal from the detection means. (3) The document feeder according to claim 1, wherein the document special device section has a laminated document special device section, which is composed of a removable cassette that accommodates documents in a stacked manner. . (4) The document special device section has a laminated document special device section, and the supply mechanism is configured to detect a document waiting in the stacked document special device section and make it possible to automatically take out the document. A document feeding device according to claim 1.