JP4144859B2 - Automatic document feeder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic document feeder, and more particularly, to an automatic document feeder that appropriately controls the space between a plurality of conveyed documents.
[0002]
[Prior art]
[Patent Document 1]
JP-A-5-105273
[Patent Document 2]
Japanese Patent No. 2930817
2. Description of the Related Art Conventionally, in a copying apparatus, an automatic document feeder that automatically conveys a document to a document reading position of the copying apparatus has been mounted in order to improve copy efficiency.
[0003]
Such an automatic document feeder separates a plurality of documents set on a document table one by one and sequentially conveys them with a predetermined gap between them, in order to improve copy efficiency. In order to narrow the gap between the original sheets, the leading edge of the next original is conventionally fed to a predetermined first-out position.
[0004]
As a conventional technique for performing the advance delivery of such a document, for example, during the copying of the first document, the first delivery of the second document from the document tray is started and then the third document on the document tray is started. When the presence of a document is detected, the first copy paper is fed out to the third document, and the first feed in a copying machine that detects the presence of the third document at least at the start of feeding the copy paper. There is a paper method (Patent Document 1).
[0005]
In other words, this prior art prevents unnecessary first-out feeding by not performing first-out feeding when the third original is extracted before feeding the copy paper to the third original. Yes.
[0006]
Further, conventionally, an error in the stop position of the leading edge of the document conveyed to the pre-step position where the leading edge of the document is positioned at an intermediate reference point substantially at the center of the platen glass is detected by the detecting means, and the detected error is detected. An automatic document feeder has been proposed that corrects the position where the next document waits at the entrance (see Patent Document 2).
[0007]
In other words, this prior art attempts to improve the document transport performance by accurately controlling the advance position.
[0008]
[Problems to be solved by the invention]
However, in order to further improve the copy efficiency, it is necessary to further reduce the space between the originals. In order to reduce the distance between the original reading position and the advance position of the next original, the leading edge of the first original is made as much as possible. It is necessary to advance to the downstream side in the transport direction.
[0009]
However, if the first document is advanced too far downstream in the document transport direction, the leading edge of the first document comes into contact with the transport belt, and in the duplex mode where both sides of the document are scanned, the document that has been scanned on one side is transported once and turned upside down. After that, the conveyance belt is reversed and conveyed to the reading position again. However, due to the reverse rotation of the conveyance belt, there is a problem in that the conveyance belt and the first document are rubbed to generate a frictional sound.
[0010]
Accordingly, the invention according to claim 1 separates a plurality of documents placed on the document table one by one and conveys them to the document reading position, and the next document from the document reading position in the document conveying direction. When the document placed on the document table is a one-sided document that reads only one side when the document is first advanced to the predetermined first position, the document next to the document conveyed to the document reading position is moved from the first position. In addition, by performing one-sided document advance control processing that advances to a predetermined one-sided document advance position on the document reading position side, while preventing the generation of frictional noise in the duplex mode, the gap between the sheets is reduced as much as possible, and the copy efficiency is further improved. An object of the present invention is to provide an automatic document feeder having improved usability and improved usability.
[0013]
[Means for Solving the Problems]
The automatic document feeder according to the first aspect of the invention separates a plurality of documents placed on a document table one by one and conveys them to a document reading position, and also feeds the next document from the document reading position. An automatic document feeder that advances in advance to a predetermined advance position in front of the document conveyance direction, and if the document placed on the document table is a single-sided document that reads only one side, it is conveyed to the document reading position. The above object is achieved by performing a single-sided document advance control process in which the document next to the original is advanced to a predetermined single-sided document advance position closer to the document reading position than the advance position.
[0014]
According to the above configuration, the plurality of documents placed on the document table are separated one by one and conveyed to the document reading position, and the next document is moved to a predetermined position before the document reading position in the document conveyance direction. When the document placed on the document table is a single-sided document that reads only one side when the document is advanced in advance to the first-out position, the document next to the document conveyed to the document-reading position is moved to the document-reading position from the first-position. Since the single-sided document advance control process is performed to advance to a predetermined single-sided document advance position on the side, it is possible to reduce the gap between sheets as much as possible while preventing the generation of frictional noise in the duplex mode, and further improve the copy efficiency. It is possible to improve usability.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. The embodiments described below are preferred embodiments of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. As long as there is no description which limits, it is not restricted to these aspects.
[0020]
FIGS. 1 to 24 are diagrams showing an embodiment of an automatic document feeder of the present invention. FIG. 1 shows an automatic document feeder 1 to which an embodiment of the automatic document feeder of the present invention is applied. It is a front schematic block diagram.
[0021]
In FIG. 1, an automatic document feeder 1 includes a paper feed mechanism 3, a paper feed roller 4, a transport unit 5, a paper discharge outlet roller 6, a double-side claw 7, a switchback claw 8, and a switchback roller 9 in a housing 2. , A reversing unit 10, a paper discharge path 11, a paper discharge outlet roller 12, a document set sensor 13, a pull-out sensor 14, a registration sensor 15, a paper discharge inlet sensor 16, and a paper discharge outlet sensor 17 are housed and disposed. 2 is provided with a contact glass 18. In the automatic document feeder 1, a paper discharge tray 19 is formed in the upper part of the housing 2, and a document tray (original table) 20 is provided above the paper discharge tray 19.
[0022]
The automatic document feeder 1 is assembled in an image reading apparatus such as an electrophotographic copying machine, and an image reading unit of the image reading apparatus is disposed below the contact glass 18. The image reading unit of the image reading apparatus irradiates reading light from a light source (not shown) onto the original G (see FIGS. 15 to 24) conveyed to the reading position on the contact glass 18, and reflects the original G. The reflected light including the image information of G is photoelectrically converted by the photoelectric conversion element, whereby the image of the original G is read.
[0023]
As shown in FIG. 2, the automatic document feeder 1 has a circuit block configuration. The document set sensor 13 (not shown), a pull-out sensor 14, a registration sensor 15, a paper discharge inlet sensor 16, and a paper discharge outlet sensor 17 are arranged. Etc., a CPU (Central Processing Unit) 101, a ROM (Read Only Memory) 102, a RAM (Random Access Memory) 103, an engine I / O 104, a main body I / F 105, a calling motor 106, a paper feed motor 107, A conveyance motor 108, a paper discharge motor 109, a switchback claw solenoid 110, a double-side claw solenoid 111, a paper discharge clutch 112, etc. are provided. It is connected. The operation unit 201 of the image reading apparatus main body is connected to the main body I / F 105, and the main body I / F 105 notifies the CPU 101 of the operation content of the operation unit 201 via the bus 113. The operation information of the collected automatic document feeder 1 is notified to the operation unit 201 as necessary.
[0024]
Each part from the pull-out sensor 14 to the paper discharge clutch 112 is connected to the engine I / O 104, and the engine I / O 104 exchanges information between these parts and the CPU 101 via the bus 113.
[0025]
In the automatic document feeder 1, the CPU 101 controls each part of the automatic document feeder 1 while using the RAM 103 as a work memory based on a program in the ROM 102 to perform processing as the automatic document feeder 1 and will be described later. A conveyance control process, in particular, a single-sided document advance control process is executed.
[0026]
In the automatic document feeder 1, a plurality of documents G are placed on the document tray 20, the document set sensor 13 detects the documents G placed on the document tray 20, and the engine I / O 104 is used. The data is output to the CPU 101.
[0027]
In the paper feed mechanism 3, when the calling motor 106, which is a stepping motor, rotates in the forward direction, the roller portion on the side of the document tray 20 moves up and down as shown by a double arrow in FIG. As illustrated in FIG. 4, the paper feeding mechanism 3 rotates clockwise and the paper feeding roller 4 rotates counterclockwise, so that a plurality of documents set on the document tray 20 are rotated. G is separated from the upper document G and fed one by one. Further, as shown in FIG. 5, when the paper feed motor 107 is reversed, the paper feed mechanism 3 is stopped, and only the paper feed roller 4 rotates counterclockwise, thereby conveying the document G.
[0028]
The pull-out sensor 14 detects the document G sent from the document tray 20 by the paper feed mechanism 3, and the paper feed roller 4 detects the document G sent by the paper feed mechanism 3 between the contact glass 18 and the transport unit 5. Feed in between.
[0029]
The registration sensor 15 is disposed in front of the contact glass 18 in the document transport direction by the paper feed roller 4, detects the document G transported on the contact glass 18, and outputs it to the CPU 101 via the engine I / O 104. To do.
[0030]
The CPU 101 can detect the length of the document G from the on / off timing of the pull-out sensor 14 and the registration sensor 15.
[0031]
As shown in FIG. 6, when the conveyance motor 108 rotates in the forward direction, the conveyance unit 5 rotates its driving roller 5a counterclockwise and rotates the conveyance belt 5b counterclockwise. 4, the document G transported between the contact glass 18 and the contact glass 18 is transported to the reading position on the contact glass 18 and temporarily stopped, and the image reading unit of the image reading device reads the document G. When reading of the image of the original G is completed, the original G for which the image has been read is conveyed to the paper discharge outlet roller 6.
[0032]
Further, as shown in FIG. 7, when the conveyance motor 108 is reversed, the conveyance unit 5 rotates its driving roller 5a in the clockwise direction, and rotates the conveyance belt 5b in the clockwise direction to complete the reading once. The double-sided original G that has been reversed is turned upside down by the reversing unit 10, and then reversely conveyed to the reading position on the contact glass 18 again.
[0033]
A paper discharge inlet sensor 16 is disposed in front of the paper discharge outlet roller 6, and the paper discharge inlet sensor 16 detects the document G conveyed to the paper discharge outlet roller 6 by the conveyance unit 5 and detects the engine I. The data is output to the CPU 101 via / O104.
[0034]
The paper discharge exit roller 6 transports the original G conveyed by the transport unit 5 to the double-sided claw 7, and the double-sided claw 7 is inclined when the double-sided claw solenoid 112 is turned on / off as shown in FIG. A paper discharge conveyance path for discharging the original G through the paper discharge path 11 to the paper discharge tray 19 through the paper discharge outlet roller 12, a reverse conveyance path for conveying the original G to the reversing unit 10 via the switchback claw 8, Switch to.
[0035]
As shown in FIG. 9, the inclination of the switchback claw 8 changes when the switchback claw solenoid 110 is turned on / off, and the original G sent in the direction of the switchback claw 8 by the double-sided claw 7 is reversed again. Then, the path of feeding in the direction to be transported to the reading position on the contact glass 18 by the transport unit 5 rotating in the reverse direction, and the document G sent in the direction of the switchback claw 8 by the double-sided claw 7 are reversed by the switchback roller 9. The document G fed into the unit 10 and sent out from the reversing unit 10 by the switch back roller 9 is switched to a path through which the paper G is discharged onto the paper discharge tray 19 by the stone rollers 12.
[0036]
The switch back roller 9 is rotationally driven by the paper discharge motor 109 and, as described above, performs normal rotation and reversal so that the document G fed by the switch back claw 8 is fed into the reversing unit 10. Then, the document G in the reversing unit 10 is sent out.
[0037]
The paper discharge outlet roller 12 is rotated by a paper discharge motor 109 and discharges the original G conveyed to the paper discharge path 11 onto the paper discharge tray 19.
[0038]
The paper discharge clutch 112 turns on / off the drive of the paper discharge outlet roller 6 among the paper discharge outlet roller 6, the switchback roller 9 and the paper discharge outlet roller 12 that are driven and controlled by the paper discharge motor 109. That is, when the paper discharge motor 109 rotates forward, the paper discharge outlet roller 6, switchback roller 9 and paper discharge outlet roller 12 all rotate counterclockwise as shown in FIG. Then, as shown in FIG. 11, the discharge outlet roller 6 and the discharge outlet roller 12 rotate counterclockwise, and the switchback roller 9 rotates clockwise. If the paper discharge clutch 112 is off when the paper discharge motor 109 rotates forward or reverse, as shown in FIG. 12, the paper discharge outlet roller 6 becomes free, and the switch back roller 9 and paper discharge Only the exit roller 12 rotates in accordance with the normal rotation or reverse rotation of the paper discharge motor 109.
[0039]
Next, the operation of the present embodiment will be described. The automatic document feeder 1 according to the present embodiment is characterized in that it is transported with the interval between the sheets as narrow as possible and controls the sheet interval processing according to the document type.
[0040]
As described above, the automatic document feeder 1 is assembled in an image reading apparatus such as a copying apparatus, and the image reading apparatus uses the automatic document feeder 1 to perform a copying operation of a plurality of documents G. A user sets a plurality of documents G on the document tray 20 of the automatic document feeder 1, and a single-side mode in which only one side of the document G is read, a double-sided reading mode in which both sides of the document G are read, and different sizes of documents G are mixed. A necessary mode setting operation such as a mixed document mode to be performed is performed by the operation unit 201 of the image reading apparatus, and then a start key of the operation unit 201 is pressed.
[0041]
In the following description, it is assumed that an A4Y size document is conveyed.
[0042]
In the automatic document feeder 1, as described above, when a plurality of documents G are set on the document tray 20, the document setting sensor 13 detects the setting of the documents G, and various necessary setting operations are performed. When the start key is pressed by the operation unit 201, the CPU 101 recognizes the press of the start key via the main body I / F 105, and the CPU 101, as shown in FIG. 107 and the transport motor 108 are driven to start feeding the first original G (the uppermost original G among the originals G placed on a plurality of sheets) (step S101).
[0043]
The CPU 101 transports the document G, which has started feeding, to the document reading position on the contact glass 18 which is set in advance by the number of rotations of the pull-out sensor 14, the registration sensor 15, the sheet feeding motor 107, and the transport motor 108, and the like. As shown in FIG. 15, when the reading is stopped at the original reading position (step S102) and reading of the original G at the original reading position is started in the image reading apparatus body, the calling motor 106 and the paper feed motor 107 are simultaneously driven. Then, as shown in FIG. 16, the first document G is transported to the predetermined document first position and stopped first (step S103).
[0044]
When starting the document advance, the CPU 101 waits for the reading of the first document G to be completed (step S104), and checks whether the reverse feeding is performed according to the setting mode in the image reading apparatus main body (step S105).
[0045]
In step S105, if it is reverse feeding, the CPU 101 performs single-sided document advance control processing for setting a stop position of the first-out document G, which will be described later, to the downstream side in the document transport direction (document reading position side) from the normal first-out position. Then, the normal double-sided copy operation is performed and the process is terminated (step S106).
[0046]
In step S105, the CPU 101 checks whether the document feeding mode is normal feeding / discharging instead of reverse feeding, and checks whether it is a document mixing mode in which documents of different sizes are mixed (step S107). Without performing the one-sided document advance control process, the document mixed operation process is performed and the copy process is performed (step S108).
[0047]
If it is determined in step S107 that the original document mixed mode is not set, the CPU 101 checks whether or not the completed stamp mode for stamping the original G on the original G is checked (step S109). Then, a normal copy operation process is performed, and a completed stamp copy process for performing a completed stamp operation for impressing a completed stamp on the document G that has been read is performed (step S110).
[0048]
If the completed stamp mode is not set in step S109, the CPU 101 moves the first document G from the document reading position to the downstream side in the document transport direction and the second document G as shown in FIG. The document feeding operation for conveying the document to the document reading position is performed simultaneously (step S111). As shown in FIG. 16, the first document G is located downstream from the document reading position in the document transport direction. The conveyance of the original G is stopped in a state where the original G is located at the original reading position (step S112).
[0049]
Next, when the CPU 101 stops the second original G at the original reading position and starts reading the second original G at the original reading position in the image reading apparatus main body, The paper feed motor 107 is driven to advance the 3rd-Nth document G (N is a count value of a counter that counts the second and subsequent documents G, and N = 0 for the third document). 16 (step S113), as shown in FIG. 16, the single-sided document first-out position in which the 3 + N-th document G is positioned a predetermined amount downstream from the first-sheet position of the second document G in the document transport direction. A one-sided document advance control process is performed to transport the sheet to stop (step S114). In this way, by setting the one-sided document first-out position, which is the first-out position of the 3 + Nth document G, to the downstream side in the document transport direction by a predetermined amount from the first-image position of the second image forming apparatus, the paper of the document G The gap can be further reduced.
[0050]
Next, when the CPU 101 starts the 3 + N single-sided document advance, the CPU 101 waits for the reading of the second (2 + N) document G to be completed (step S115), and the 1 + N and 2 + Nth sheets. The document shift operation for transporting the document G to the downstream side in the document transport direction and the document feeding operation for transporting the 3 + Nth document G to the document reading position are performed simultaneously. As shown in FIG. The conveyance of the original G is stopped in a state where the original G of the eye is located downstream from the original reading position in the original conveying direction and the third original G is located at the original reading position (step S116). At this time, if the count value N of the counter is “1” or more, the Nth original G is discharged.
[0051]
Next, the CPU 101 waits for the feeding of the 3 + Nth original G to the original reading position (step S117), and determines whether the next original G is on the original tray 20 by the original set sensor 13. A check is made based on the detection result (step S118), and when there is a next original G, the count value N of the counter is incremented by “1” (step S119), and the process proceeds to step S113, where the 3 + Nth original is detected. The same processing as described above is performed from the start of single-sided document advance (steps S113 to S119).
[0052]
In this process, since the count value N is “1”, the Nth original G, that is, the first original G is shown in FIG. In this manner, the paper is discharged to the reversing unit 10.
[0053]
In step S118, as shown in FIG. 18, when there is no next original G on the original tray 20, the 3 + Nth original G is read, and when the reading of the 3 + Nth original G is completed, The original G is discharged and the process is terminated (step S120).
[0054]
In the discharge process of the original G, as shown in FIG. 19, the most downstream original G in the original conveying direction is conveyed to the reversing unit 10, and the original G conveyed to the reversing unit 10 is as shown in FIG. The paper is discharged onto the paper discharge tray 19. As shown in FIGS. 21 to 24, this paper discharge process is performed on each original G remaining on the conveyance path, so that all the originals G are finally transferred to the output tray 19 as shown in FIG. To discharge.
[0055]
As described above, the automatic document feeder 1 according to the present embodiment separates a plurality of documents G placed on the document tray 20 one by one and conveys them to the document reading position, and also feeds the next document G. When the document G placed on the document tray 20 is a single-sided document that reads only one side when the document is first advanced to a predetermined first position before the document reading position, the document is transferred to the document reading position. A single-sided document first-out control process is performed in which the next document of the original G is firstly advanced to a predetermined one-sided document first-positioned position closer to the document reading position than the first-out position.
[0056]
Accordingly, it is possible to make the gap between the sheets as small as possible while preventing the generation of frictional noise in the double-sided mode, thereby further improving the copy efficiency and improving the usability.
[0057]
Further, the automatic document feeder 1 according to the present embodiment executes the document conveyance process without performing the one-sided document advance control process when the document G of different sizes is mixedly loaded on the document tray 20. is doing.
[0058]
Therefore, in the mixed document mode in which a plurality of documents G are not placed on the contact glass 18 that is the reading position, it is possible to prevent the document G from being rubbed and damaged as much as possible by not performing the single-sided document advance control. Copy efficiency can be further improved and usability can be improved.
[0059]
Further, the automatic document feeder 1 according to the present embodiment is not subjected to single-sided document advance control processing when the already-read stamp giving mode for giving a finished stamp to the already-read document G is given. The transfer process is being executed.
[0060]
Therefore, in the stamp application mode in which a plurality of documents G are not placed on the contact glass 18 that is the reading position, it is possible to prevent the document G from being rubbed and damaged as much as possible by not performing the single-sided document advance control. Copy efficiency can be further improved and usability can be improved.
[0061]
The invention made by the present inventor has been specifically described based on the preferred embodiments. However, the present invention is not limited to the above, and various modifications can be made without departing from the scope of the invention. Needless to say.
[0062]
【The invention's effect】
According to the automatic document feeder of the first aspect of the present invention, a plurality of documents placed on the document table are separated one by one and conveyed to the document reading position, and the next document is transferred to the document reading position. If the document placed on the document table is a one-sided document that reads only one side when the document is advanced in advance to a predetermined first position before the document conveyance direction, the next of the document conveyed to the document reading position is A single-sided document advance control process is performed to advance the document to a predetermined single-sided document advance position closer to the document reading position than the advance position, so that the gap between the sheets can be made as narrow as possible while preventing the generation of friction noise in the duplex mode. Thus, the copy efficiency can be further improved and the usability can be improved.
[Brief description of the drawings]
FIG. 1 is a schematic front view of an automatic document feeder to which an embodiment of an automatic document feeder of the present invention is applied.
FIG. 2 is a main part circuit block diagram of the automatic document feeder of FIG. 1;
FIG. 3 is a diagram illustrating a sheet feeding operation of the sheet feeding mechanism of FIG. 1;
FIG. 4 is an operation explanatory diagram of the sheet feeding mechanism and the sheet feeding roller in a state where the sheet feeding mechanism in FIG. 1 rotates in the clockwise direction and the sheet feeding roller rotates in the counterclockwise direction.
FIG. 5 is an operation explanatory diagram of the sheet feeding mechanism and the sheet feeding roller in a state where the sheet feeding mechanism in FIG. 1 is stopped and only the sheet feeding roller is rotated counterclockwise.
6 is an operation explanatory diagram of the conveyance unit in a state where the conveyance unit of FIG. 1 is rotating in a direction in which a document is conveyed in a forward direction.
7 is an operation explanatory diagram of the conveyance unit in a state where the conveyance unit of FIG. 1 is rotating in a direction in which a document is conveyed in a reverse direction.
8 is an operation explanatory diagram of the double-sided claw of FIG. 1. FIG.
9 is an operation explanatory view of the switchback claw of FIG. 1. FIG.
10 is an operation explanatory diagram of the paper discharge outlet roller, the switch back roller, and the paper discharge outlet roller in FIG. 1. FIG.
11 is an operation explanatory diagram of the paper discharge outlet roller, the switch back roller, and the paper discharge outlet roller in FIG. 1. FIG.
12 is an operation explanatory diagram of the discharge outlet roller, the switch back roller, and the discharge outlet roller of FIG.
13 is a flowchart showing document conveyance control processing by the automatic document feeder of FIG.
14 is a flowchart showing processing subsequent to the document conveyance control processing of FIG.
15 is a schematic front view of the automatic document feeder of FIG. 1 in which the first document is transported to the reading position and the second document is advanced to the first-out position in the document transport control processing of FIGS. 13 and 14. FIG. Diagram.
16 and FIG. 14 shift the first document to transport the second document to the reading position and perform the one-sided document advance processing to the one-sided document first-out position by shifting the first document to the reading position. The front schematic block diagram of the automatic document feeder of FIG. 1 of a state.
17 and 14 shift the first and second originals in the original conveyance control process of FIGS. 13 and 14, convey the third original to the reading position, and place the fourth original on the one-side original advance position. FIG. 2 is a schematic front view of the automatic document feeder in FIG.
FIG. 18 shows a state in which the first document is transported to the reversing unit, the second and third documents are shifted, and the fourth document is transported to the reading position in the document transport control process of FIGS. 13 and 14; FIG. 2 is a schematic front view of the automatic document feeder in FIG. 1.
FIG. 19 is a flowchart illustrating a process of controlling the conveyance of the document in FIG. 13 and FIG. 14 to eject the first document from the reversing unit to the ejection tray and transport the second document to the reversing unit. FIG. 2 is a schematic front view of the automatic document feeder in FIG. 1 in a state where a document is shifted.
20 shows a state in which the second original from the state shown in FIG. 19 is discharged from the reversing unit to the discharge tray and the third and fourth originals are shifted in the original conveyance control process shown in FIGS. FIG. 2 is a schematic front view of the automatic document feeder in FIG. 1.
21 shows the automatic document feeder of FIG. 1 in a state where the third document is conveyed from the state of FIG. 20 to the reversing unit and the fourth document is shifted from the state of FIG. FIG.
22 is a diagram illustrating a state in which the third original is discharged from the reversing unit to the discharge tray and the fourth original is shifted from the state shown in FIG. FIG. 2 is a schematic front view of an automatic document feeder.
23 is a schematic front view of the automatic document feeder of FIG. 1 in a state where the fourth document from the state of FIG. 22 is conveyed to the reversing unit in the document conveyance control process of FIGS. 13 and 14. FIG.
24 is a schematic front configuration of the automatic document feeder of FIG. 1 in a state where the fourth document from the state of FIG. 23 is discharged from the reversing unit to the discharge tray in the document conveyance control process of FIGS. 13 and 14; Figure.
[Explanation of symbols]
1 Automatic document feeder
2 Case
3 Paper feed mechanism
4 Feed roller
5 Transport section
5a Drive roller
5b Conveyor belt
6 Outlet roller
7 Double-sided nails
8 Switchback claw
9 Switch back roller
10 Inversion part
11 Discharge path
12 Discharge exit roller
13 Document set sensor
14 Pullout sensor
15 Registration sensor
16 Discharge entrance sensor
17 Output exit sensor
18 Contact glass
19 Output tray
20 Document tray
101 CPU
102 ROM
103 RAM
104 Engine I / O
105 Main unit I / F
106 Calling motor
107 Paper feed motor
108 Conveyor motor
109 Paper discharge motor
110 Switchback claw solenoid
111 Double-sided claw solenoid
112 Output clutch
201 Operation unit

Claims (1)

  A plurality of documents placed on the document table are separated one by one and conveyed to the document reading position, and the next document is advanced in advance to a predetermined first position before the document reading position in the document conveyance direction. In the automatic document feeder, if the document placed on the document table is a single-sided document that reads only one side, the document next to the document transported to the document reading position is moved from the first-out position. An automatic document feeder which performs a one-sided document first-out control process for first-out to a predetermined one-sided document first-out position on the document reading position side.

Images