JP2848341B2 - Paper transport device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper transport device,
The original is transported to a predetermined position on the platen glass and stopped.
And a sheet transport device for further discharging. 2. Description of the Related Art In recent years, the time required for copying
In addition to shortening the time required to exchange manuscripts,
The automatic document feeder (hereinafter referred to as
ADF) has been developed and put into practical use.
You. [0003] By the way, conventionally provided various ADFs
Is to transport the originals one by one onto the platen glass.
However, Japanese Unexamined Patent Publication No.
Feeds the second original after the first original
The two originals are connected in series by the so-called
An ADF that can be set on a platen glass is disclosed.
However, with the feeding method, reliable document feeding can be expected.
Therefore, practical application is difficult in terms of reliability. Accordingly, an object of the present invention is to store two sheets of paper.
Instead of feeding loosely, feed them almost continuously and individually.
Each paper can be placed side by side in a certain position
An object of the present invention is to provide a sheet transport device. [0005] To achieve the above object,
For this purpose, the paper transport device according to the present invention
Paper feeding means for feeding paper one by one
Transport means for transporting in the opposite direction, and transported by the transport means.
The distance between the next sheet and the next sheet
Detecting means for detecting and stopping the next paper with respect to the previous paper
By the detecting means so that the position becomes a predetermined position
Depending on the detected interval, advance the paper at the predetermined exposure position.
The transport amount of the transport unit that transports the subsequent paper while stopped
Control means for determining In the above arrangement, one sheet is fed from the sheet feeding means.
The paper is fed one sheet at a time, and
The next paper is conveyed continuously,
Is detected. The preceding sheet is transported by the transport unit
Is also stopped at a predetermined position. For the next paper, the previous paper stops
By the transport means continuously driven in the state
It is transported according to the interval detected by the detection means,
Is stopped at a predetermined position with respect to the sheet. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a paper transport apparatus according to the present invention will be described.
An embodiment will be described with reference to the accompanying drawings. What
In the embodiment described below, the present invention is applied to a set of originals.
Automatic document feeder that can be returned and circulated
This is applied to ADF below. (Overall configuration, see FIG. 1)
The ADF generally includes a document placing section 1 and a document feeding section 10.
, Original transport belt 30, stopper 40, and original discharge
And a unit 50. In addition, 80 is a copy machine main body.
An original platen glass provided on the upper surface, and the original is indicated by an arrow A in FIG.
(Not shown) from the position (image exposure start position)
Illuminating light in the direction of arrow a
Will be examined. The original placing section 1 is located at a front portion of the placing table 2 (see FIG. 1).
(1 center left side), a movable table 3 is provided, and a pair of lateral guide plates 5
Slide in the direction perpendicular to the original feeding direction indicated by arrow b.
The movable table 3 is provided above the movable table 3.
A photo sensor SE1 for detecting the presence or absence of a document
To align ejected documents as described below
Is installed. The movable base 3 is vertically moved with the support shaft 4 as a fulcrum.
A solenoid (not shown) is connected to the support shaft 4.
Is tied. The movable table 3 turns on and off this solenoid
At the position indicated by the solid line in FIG.
The movable position, that is, the feeding roller 11 is hidden by the movable base 3.
The position is switched to Sole to drive movable table 3
If the photo sensor SE1 does not detect the original,
Is off. At this time, the movable base 3 rotates upward
The original is set in this state. Sole
The ADF is in the operating state and the photo sensor
Turns on when SE1 detects a document. to this
And the movable base 3 rotates downward to the position shown by the solid line in FIG.
As a result, the lowermost document comes into contact with the feed roller 11.
You. The document feeder 10 is located immediately above the paper feed roller 11.
A document holding plate 12 is provided on the
A separating roller 13 and a register to which the separating pad 14 is pressed
A stroller pair 15 is provided, and a
And a pair of roller pairs 15, 16
Guide plates 17 and 18 are provided between them. Also,
Photosensor SE2 for detecting a fed document
SE3 is between the separating roller 13 and the registration roller pair 15.
Between the registration roller pair 15 and the pinch roller pair 16
It is installed in between. In particular, the photo sensor SE3 feeds
The leading and trailing edges of the scanned document are detected and the main motor rotates.
In combination with the pulse signal, the interval between two originals and the original size
Used to measure noise. Is the document holding plate 12 a flexible material?
Up and down with the upper support shaft (not shown) as a fulcrum.
It is rotatable and turns on and off a solenoid (not shown).
Driven. Soleno which drives this original pressing plate 12
The guide is normally off, and the document holding plate 12 is
Have been evacuated. And when the ADF start signal is issued
When the solenoid is turned on, the document holding plate 12
To press the leading end of the document. With this, the manuscript is
The sheet is in pressure contact with the paper roller 11 and a document feeding pressure is applied. The paper feed roller 11 and the separating roller 13 are shown in the figure.
Not connected to the feed motor via a one-way clutch
Have been. The separating roller 13 and the separating pad 14 are in friction
To ensure that documents are fed one by one by the difference in coefficients
Things. That is, the friction between the separation roller 13 and the original
The frictional force is μ1, and the frictional force between the separation pad 14 and the document is
If μ2 and the frictional force between the originals are μ3, μ1>μ2> μ
3 are set. Therefore, the feed roller 11
The document sent from the document table 2 by rotation is processed.
To pass between the roller 13 and the separation pad 14
It is judged one by one. Registration roller pair 15 and pinch roller pair 1
6 is connected to the main motor together with the original transport belt 30 and the like.
The registration roller pair 15 can be turned on and off.
A clutch is interposed. The original conveying belt 30 is driven by a driving roller 31.
The document table glass 8 is stretched endlessly between the moving rollers 32.
0 covers the entire length. The original transport belt 30 is
The motor is rotated in the direction of arrow c by the
The document is conveyed while sliding on the platen glass 80. The stopper 40 is shown in FIG.
Located at the right end, pivotable up and down around the support shaft 41
A solenoid (not shown) is connected to the support shaft 41.
Have been. This solenoid is normally turned off and the stopper
Reference numeral 40 indicates that the leading end is retracted below the upper surface of the platen glass 80.
ing. For the solenoid, the leading edge of the fed document is
Turns on when it is detected by the sensor SE3.
The end protrudes above the platen glass 80 and the document transport belt 30
Stops the document conveyed in the direction of arrow c. This
As a result, the leading end of the document is positioned at the exposure start position A.
It will be. The original is completely stopped by the stopper 40 in the solenoid.
The stopper is turned off when it is stopped at
Withdraw from the upper surface of the glass 80. With this, the discharge of the original
It becomes possible. The document discharge unit 50 includes a U-turn roller 51 and
The pinch roller 52 and the guide claws 53, 5 pressed against it.
4, 55, 56, guide plates 57, 58, discharge unit 6
0, and the document is placed immediately after the U-turn roller 51.
A photo sensor SE4 for detection is provided.
The U-turn roller 51 can be driven to rotate by the main motor.
is there. The discharge unit 60 includes guide plates 61 and 6
2. Discharge roller 63 and pinch roller 6 pressed against it
4. A photo sensor SE5 for document detection is provided.
It is set on the document table 2 so as to be movable in the horizontal direction in FIG.
ing. On the other hand, at the rear of the document table 2,
Discharge ports 2a, 2b, 2c, 2d at positions corresponding to the size
Are formed, and the guide claws 53 to 56 are connected to the respective outlets 2a to 2d.
The document is set at a position where the document can be guided. these
Each guide claw 53 to 56 is formed by a cam and a spring member (not shown).
It is rotatable and moves in conjunction with the movement of the discharge unit 60.
Make. That is, the guide claw 53 is the longest size that can be copied.
It corresponds to the manuscript and is usually withdrawn from the guide plates 57 and 58.
It is set to the retracted position, and as shown in FIG.
When the slot 60 is set immediately above the discharge port 2a, it turns downward.
To guide the document to the discharge port 2a. Guide claws 54 ~
56 is normally set at a position where it has entered on the guide plate 58.
ing. The discharge unit 60 is set directly above the discharge port 2b.
The document of the second size is
To the outlet 2b. Discharge unit 60 discharges
When set just above the opening 2c, the guide claw 54
The document of the third size is ejected by the guide claw 55
Guided by 2c. Further, the discharge unit 60 discharges
When set just above the opening 2d, the guide claws 54, 55
Evacuate it upward, and eject the original of the minimum size with the guide pawl 56.
Guided by exit 2d. The discharge unit 60 starts the copying operation.
In response to the size of the document by the operator
The guide plates 61 and 62 are discharged from the respective discharge ports 2a to 2d.
Is set to the position where the original to be received is received. At the same time, each guy
Claws 53 to 56 are set at document guide positions. Follow
The original discharged from the platen glass 80 is transported to the transport path.
Discharged while being guided by the guide claws 53 to 56 that have entered
The document is guided into the unit 60 and placed on the rollers 63 and 64.
The document is discharged onto the upper surface of the document stacked on the table 2. The discharge roller 63 is a discharge unit.
60 is rotated by a discharge motor provided at
The feeding speed is controlled by the document conveying belt 30 and the U-turn roller 51.
Is set higher than the original transport speed. This is
As described in detail below, two originals are fed and simultaneously
The first original when ejected from the base glass 80
Is discharged quickly, eliminating collisions between originals,
This is to ensure reliable discharge. In addition, the paddle
Eel 6 rotates in the direction of arrow c each time the document is ejected
And the discharged document is already placed on the placing table 2.
Align on the manuscript. Next, a series of ADFs having the above configuration will be described.
The operation will be described. First, place the original with the image side up
The document is stacked on the document table 2. At this time, the operator
Position adjustment of horizontal guide plate 5 and discharge unit 60
It is. According to the position of the discharge unit 60, the guide claw 5
3 to 56 are set, and the original is discharged to the discharge unit 60.
Prepare to guide to When the ADF enters the operating state, the movable table 3
1 Rotate down to the solid line position and lower the original
It abuts on the la 11. At the same time, the original pressing plate 12 also moves down.
Then, a paper feed pressure is applied. Here, the feed motor and main motor
The paper feed roller 11 and the separating roller 13 rotate
The document is driven to rotate and one lowermost document is fed. What
Note that the paper feed operation for replacing the original
Document output from the control unit of the copier after the copying operation is completed
It is started based on the exchange signal. The leading end of the fed document is a pair of registration rollers.
15 and is once resisted. If the leading edge of the document is
A predetermined time elapses after detection by the sensor SE2
And the clutch of the registration roller pair 15 is turned on,
The document is placed on the platen glass 80 by the rotation of the stroller pair 15
It is transported to. When the leading edge of the fed document is
When the pinch roller pair 16 is reached, the document holding plate
12 is released, the feed motor and the resist
The clutch of the roller pair 15 is turned off. Therefore,
The draft is transported by the pinch roller pair 16 and the transport belt 30.
The registration roller pair 15 is connected to the one-way clutch.
The document is fed while being rotated by the action. When the double feed mode is selected,
The trailing edge of the first document is detected by the photo sensor SE2.
Then, the feeding operation of the second document is started. First manuscript
When the leading end of the document is detected by the photo sensor SE3, the original is transported.
A stop timer for stopping the rotation of the feeding belt 30 is set.
Cut. This stop timer uses a photo sensor
Time equivalent to being transported from SE3 to the exposure start position
It is set in advance. At the same time, the document size detection
When the operation is started, the stopper 40 is moved to the original stop position.
set. The photo sensor SE3 detects the trailing edge of the document.
Then, the document size detection operation is completed and
When selecting the mode, a gap counter for measuring the document interval
The operation of the data is started. This gap counter is
Counts pulse signals output based on the rotation of the
Things. When the two-sheet feed mode is selected, the second original is fed.
The paper is printed, and the leading end is detected by the photo sensor SE3.
Then, the gap counter ends counting. One piece with this
Since the interval between the first and second originals has been measured, this total
The measured value is added to the stop timer. At the same time, the second
The document size detection operation is started. Second manuscript size
Is detected when the rear end of the second document is photosensor SE.
3 when the detection is completed, and the first and second originals
The full-length original signal to which the original size has been added is used to control the copier.
Sent to the department. When the stop timer expires, the main motor
The rotation is stopped, and the rotation of the document conveying belt 30 is stopped. This
The first document abuts against the stopper 40 and the leading edge
It stops when positioned at the exposure start position A. Manuscript
When the two-sheet feed mode is selected,
Extra rotation by document interval measured by counter
It will be driven. So the second document is the first
The document is stopped in a state of being in close contact with the rear end of the original. With this,
Two originals are arranged side by side on the platen glass 80 in series.
It will be. Then, based on the termination of the stop timer,
Signal is output to the control unit of the copier,
A beep operation is started. Copying is performed in advance according to the size of the document.
After selecting the copy size and copy magnification in the
Automatic copy to be executed or to prioritize copy paper size selection
Prioritize the operation of the magnification setting system or the selection of the copy magnification
This is executed under the operation of the automatic copy paper selection system.
Here, the optimal copy paper size in the two-sheet feed mode and
The copy magnification is shown in Table 1 below. [Table 1] When the copying operation for a predetermined number of sheets is completed,
A document replacement signal is output from the control unit of the
And the discharge motor are turned on. With this, the document transport
Alt 30, U-turn roller 51 and discharge roller 63 rotate
Is driven, and the document begins to be discharged from the platen glass 80.
You. Then, after the second original by the photo sensor SE4.
When the end is detected, the registration roller pair 15 is already in standby.
The operation of transporting the next original is started. Document ejected from platen glass 80
Is the guide claw already set according to its size
The discharging unit 60 is guided by any one of 53 to 56.
From the discharge roller 63 and the pinch roller 64
The document is discharged onto the document table 2. At this time, set the transport speed
The first sheet with the discharge roller 63 that is set large
The manuscript is ejected with the spacing increased for the second manuscript
This prevents collision between documents. Also, the photo sensor S
The paddle wheel 6 is driven by the trailing edge detection signal of the document by E5.
It is driven to rotate and aligns the discharged documents. (Control circuit, see FIG. 2) Next, the operation of the ADF
A control circuit for controlling the operation will be described. This system
The control is performed mainly by the microprocessor 100,
An ADF start signal is sent from the control unit of the copying machine.
While the mode signal and original exchange signal are input, the copy signal
Signal is output. In addition, the main
Motor, paper feed motor, discharge motor, paddle motor and each
Seed solenoid is connected, and each solenoid is connected via the input circuit 102.
Photo sensors SE1 to SE5,
A pulse detection sensor of the motor is connected. (Control procedure, see FIGS. 3 to 12)
The control procedure of the PU 100 will be described. Figure 3 shows the CPU
100 shows the main routine of the first embodiment. Power is turned on and CP
U100 is reset and the program starts
Then, in step S1, the random access memory RAM
Set clear, registers, and devices to initial mode
To perform initialization processing. Next, step S2
To S9 are sequentially called, and step S1 is executed.
At 0, a subroutine for basic timer processing is executed. here
Defines the time required for the main routine with the basic timer,
After waiting for the end of the basic timer, the process returns to step S2. This
Using the length of time of one subroutine of
Performs counting of ima. By the way, in the subroutine of step S2,
Indicates the state of the input port of the CPU 100, that is, each photocell.
The on / off and edge states of the sensors SE1 to SE5 are determined.
Refuse. In the subroutine of step S3, the CPU 10
The signal output from the 0 output port is determined. In the subroutine of step S4, the copying machine
Processing based on various signals transmitted from the CPU of the main unit
And a communication process, and will be described in detail below. Of step S5
In the subroutine, the document feeding operation is executed and the details are described below.
Will be described. In the subroutine of step S6, the original is
A process of transporting the product onto the base glass 80 and stopping it is executed.
It is described in detail below. In the subroutine of step S7, the original is
The process of discharging the document from the platen glass 80 onto the table 2 is executed.
And detailed below. In the subroutine of step S8
Detects a trouble such as a paper jam of a document. A paper jam
Is detected by combining each photo sensor with a timer.
This is performed by a known method. In the subroutine of step S9
Counts the number of originals set on the placing section 1.
You. The number of manuscripts is controlled by the operator in advance.
It is input to the control unit. FIG. 4 shows the communication processing executed in step S4.
The following shows the subroutine. Here, it is relevant to the present invention.
Will be described. First, in step S20, A
Check that the DF start signal is set to "1"
Then, in step S21, the paper feed request flag is set to "1".
The first sheet flag is set to "1" in step S22.
To The paper feed request flag starts the paper feed operation by the ADF
The first sheet flag is for the original to be fed.
Is for displaying the first sheet. Next, in step S23, the number of originals is counted.
If it is confirmed that the signal has been set to "1",
In step S24, the document count request flag is set to "1".
And at step S25, the sheet feed request flag is set to "0".
And the first sheet flag is set in step S26.
Reset to "0". The document count request flag is
Flag for executing subroutine of step S9
It is. Next, in step S27, the two-sheet feed mode signal is sent.
It is determined whether the signal is set to "1".
If set to "1", feed two sheets in step S28
Set the flag to “1” and reset to “0”.
If so, the two-sheet feed flag is reset to "0" in step S29.
To This double-sheet feed flag indicates that the double-sheet feed mode is selected.
Display that the In step S30, a document exchange signal is output.
When it is confirmed that the value has been set to "1", step S
At 31, the discharge request flag is set to "1". This emission
The request flag causes the document to be discharged from the platen glass 80
This is a flag for requesting an operation. FIG. 5 is a sheet feeding process in which step S5 is executed.
The following shows the subroutine. First, in step S40, a paper feed is required.
Determine whether the request flag is set to "1"
You. Main routine immediately if reset to “0”
Return to step S41, and if it is set to "1", step S41
To determine whether the paper feed operation flag is set to "1".
judge. If set to “1”, the paper feed operation has already been performed.
The process moves to step S44 because the operation is in progress. Reset to “0”
If it is set, in step S42, the paper feeding operation flag is set.
Is set to "1", and in step S43, the document holding plate
Turn on the solenoid and turn off the paper feed motor in step S44.
On. As a result, the original pressing plate 12 presses the upper surface of the original.
The paper feed roller 11 and the separating roller 13 are driven to rotate.
And the document is fed. Next, in step S45, the photo sensor SE
2 determines whether the leading edge of the fed document has been detected.
You. If not detected, the process proceeds to step S47, and the detection is performed.
If so, the registration timer is started in step S46.
You. The registration timer registers the leading edge of the fed document.
Documents are aligned exactly (rolling prevention).
Stop), and the photo sensor SE2
10mm allowance for the distance between the registration roller pair 15
Is set in advance. Next, at step S47, the registration timer
Waiting for the end, the sheet feed request flag is set in step S48.
The flag is reset to “0”, and the flag during the paper feeding operation is
Reset to "0". Further, in step S50
The document holding plate solenoid is turned off, and the power is supplied at step S51.
Turn off the paper motor. With this, the tip of the original is registered
The paper feeding operation is stopped in a state in which
Is stopped. Subsequently, in step S52, the advance flag is set.
Set to “1”. This advance flag indicates that the document is registered.
The controller 15 indicates that it is in the standby state. Next, in step S53, the first sheet flag is set.
It is determined whether or not it is set to “1”. To “0”
If reset, exit this subroutine,
If set to "1", a transport request is made in step S54.
The flag is set to "1", and the first sheet
Reset the lag to "0" and end this subroutine
You. The transport request flag indicates that the original is to be
This is a flag for requesting to be transported upward. FIGS. 6 to 9 show the transport executed in step S6.
4 shows a subroutine of a sending process. First, in step S60
Determine whether the transport request flag is set to "1".
Set. Main line immediately if reset to “0”
Return to the routine. If set to “1”, step S
Is the transporting flag set to "1" at 61
Determine whether or not. If set to “1”,
Since the sending operation is being performed, the process proceeds to step S70.
If it has been reset to "0", the main
It is determined whether the motor is in the ON state. Turned on
If not, the main motor is turned on in step S63,
Move to step S75. With this pinch roller pair 1
6. The document transport belt 30 is driven to rotate,
Start-up is planned. On the other hand, in step S62, the main motor
If it is determined that the switch is turned on,
Then, it is determined whether or not the flag is set to "1".
If reset to “0”, immediately go to step S75
The process proceeds to step S65 if it is set to "1".
Turn on the stroller clutch. With this, registrar
Roller pair 15 starts rotating, and the waiting document is placed on the platen glass.
80. Then, in step S66, the transport
The sending operation flag is set to "1", and in step S67
The advance flag is reset to "0". Next,
In step S68, the two-sheet feed flag is set to "1".
It is determined whether or not. If it is reset to “0”,
Proceed to step S75, and if set to “1”, go to step S75.
In step S69, the continuous transport request flag is set to “1”,
Move to step S75. Two continuous transfer request flags
In the feed mode, the registration roller pair 15
A flag for starting the conveyance of the second original
You. In step S61, the in-transfer flag is set.
If it is determined that “1” has been set, that is, the first
If the original is in the transport state, the leading-edge
Determine whether the lag is set to "1" and
In S71, the continuous transport request flag is set to "1".
Is determined. Both are reset to “0”
If there is, the process immediately proceeds to step S75. Any
If set to “1”, the registrar is executed in step S72.
Turn on the roller clutch and request continuous conveyance in step S73.
The flag is reset to "0", and advance is performed in step S74.
The flag is reset to “0”, and the process proceeds to step S75
You. With this, the second document is carried onto the platen glass 80
Will be sent. Next, in step S75, the photo sensor SE
Judge whether the leading edge of the document that has started to be conveyed has been detected
I do. If not, the process proceeds to step S87, and the
If it is issued, the conveyance belt stop timer is set in step S76.
To This stop timer is triggered by the photo sensor SE3.
Up to the original stop position (exposure start position A) by the
Set to count main motor pulses for distance
Have been. Subsequently, in step S77, the stopper solenoid
Turn on the guide and move the stopper 40 to the original stop position.
You. Further, in step S78, the leading end detection counter is turned on.
To increment. The leading edge detection counter is
When the tip is detected by photo sensor SE3, increment
The original is detected as “1” when the first original is detected.
In article detection, it is counted as “2”. Then, step S
Rotate the main motor to detect the original size at 79
Start counting pulses. Next, at step S80, a tip detection counter is set.
It is determined whether or not the count value of “2” is “2”.
To check if the double-sheet feed flag is set to "1" or not.
judge. That is, the photo determined in step S75
The detection of the leading edge of the document by the sensor SE3 is a two-sheet feed mode.
Is it the first document of the time or the second document
Or the original in the normal original transport mode
Is determined. Here, the determination in steps S80 and S81
Table 2 shows the results and the types of originals. [Table 2] Therefore, when the original is in the first sheet in the two-sheet feed mode,
If there is (NO in step S80, YE in step S81)
S), immediately proceed to step S87. Normal manuscript transport
If the transmission mode is selected (NO in step S80, step S80)
81, NO), and a conveyor belt stop timer in step S82.
The number of pulses that enables an overrun of about 10 mm
In addition, set. This is when the leading edge of the original is
This is to improve the alignment of the original by abutting. Further
In step S83, the tip detection counter is reset.
The process moves to step S87. The original is the second original in the two-sheet feed mode.
If (YES in step S80), a gap is set in step S84.
The measurement by the interval counter is terminated. The gap counter is
In step S97 of this subroutine described below,
The first sheet when executing the two-sheet feed mode
Set the distance between the trailing edge of the original and the leading edge of the second original to
It is measured by counting the rotation pulse signal.
You. Then, in step S85, the transport belt stop timer
The pal corresponding to the document interval measured by the gap counter
And set the number. This is the leading edge of the first document
After contacting the stopper 40 to adjust the alignment, 2
The first original is transported to a position where it comes into close contact with the first original,
Will be suspended. Further, in step S86, the tip
Reset the detection counter and proceed to step S87
You. Next, in step S87, the photo sensor SE
2 determines whether the trailing edge of the fed document has been detected.
You. If not detected, the process proceeds to step S91, and the detection is performed.
Then, in step S88, the photo sensor SE1
It is determined whether the empty is detected. Manuscript exists
If the sheet has been fed, the sheet needs to be fed in step S89 for the next sheet feeding.
Request flag is set to "1", and the
Turn off the trawler clutch. Manuscript must exist
In step S90, the registration roller clutch is turned off.
You. The registration roller pair 15 is turned off at this time.
Even the clutch has a one-way function,
Rotates following the transport of Next, in step S91, the photo sensor SE
3 determines whether or not the trailing edge of the document has been detected. Detect
If not, the process proceeds to step S104.
In step S92, the rear end detection counter is incremented.
Thus, the trailing edge detection counter is
Incremented when detected at SE3,
As with the edge detection counter, "1"
In addition, in the detection of the second document, it is counted to “2”. Next, at step S93, a rear end detection counter is set.
It is determined whether or not the count value of “2” is “2”.
To check if the double-sheet feed flag is set to "1" or not.
judge. That is, the photo determined in step S91
The detection of the trailing edge of the original by the sensor SE3 is a two-sheet feed mode
Is it the first document of the time or the second document
Or the original in the normal original transport mode
Is determined. Here, the determination in steps S93 and S94
Table 3 shows the results and the types of originals. Here,
Is basically the same as the determination shown in Table 2 above.
You. [Table 3] Therefore, when the original is in the first sheet in the two-sheet feed mode,
If there is (NO in step S93, YE in step S94)
S), in step S95, the sub
A routine is executed, and the size code is set to R in step S96.
Store in AM. Then, in step S97, the gap cow
Then, the process proceeds to step S104. This
Is the same as described in step S84.
To measure the interval between the first and second originals
is there. In the normal document transport mode (step
(NO in S93, NO in step S94), step S9
At step 8, a subroutine of a document size detection mode is executed.
In step S99, the size code is sent to the control unit of the copying machine.
Set to send. Further, step S100
To reset the rear end detection counter, and proceed to step S104.
Transition. The original is the second original in the two-sheet feed mode.
If (YES in step S93), in step S101
Execute the document size detection mode subroutine and
In step S102, the size code transmission
Execute the subroutine of Subroutine here
Is the first original document stored in step S96.
Size of the second document detected in step S101.
And send that information to the control unit of the copier.
Set it. Further, in step S103, the trailing end is detected.
The counter is reset, and the process proceeds to step S104. Next, at step S104, the conveyance belt is stopped.
When the end of the timer is confirmed, the process proceeds to step S105.
Motor is turned off, and the stopper solenoid
Turn off the id. Then, the transport operation is performed in step S107.
While resetting the middle flag to “0”, step S1
At 08, the transport request flag is reset to "0". Continued
Then, in step S109, the copy start signal is turned on,
A copy start signal is sent to the control unit of the copier.
And the subroutine ends. FIGS. 10, 11 and 12 show steps S7.
4 shows a subroutine of a discharging process to be executed. First,
In step S110, the discharge request flag is set to "1".
Is determined. If reset to “0”
Return immediately to the main routine. Set to “1”
If the discharge operation flag is set to "1" in step S111.
It is determined whether or not it is set. Set to “1”
If so, it means that the discharging operation is already being performed, and thus the process proceeds to step S11.
Go to 5. If it is reset to “0”,
In step S112, the discharging operation flag is set to "1", and
In step S113, the main motor is turned on, and in step S1
At 14, the discharge motor is turned on. With this, the platen glass
The discharge of the original on the sheet 80 starts. Next, at step S115, the photo sensor S
It is determined whether or not E4 has detected the trailing edge of the document.
Whether the advance flag is set to "1" in S116
Determine whether or not. The processing here is performed at the same time
Is executed to start the conveyance of the original, and the trailing edge of the original
Has passed the photo sensor SE4 and the leading edge of the next original
Is waiting at the registration roller pair 15, the step
In step S117, the transport request flag is set to "1". Next, at step S118, the photo sensor S
It is determined whether E5 has detected the trailing edge of the document. Detect
If not, the process proceeds to step S133.
In step S119, the discharge rear end detection counter is incremented.
To The discharge trailing edge detection counter was discharged in this way.
When the trailing edge of the document is detected by photo sensor SE5,
The front end detection counter and the rear end detection cow are incremented.
In the same way as the
Is counted as "2". Next, in step S120, the two-sheet feed flag is set.
Is set to “1”. “1”
If it is set to
If there is, in step S121, the power of the discharge trailing edge detection counter is
It is determined whether the count value is “2”. The count value is
If "1", the paddle wheel 6 is turned on in step S122.
Execute the rotation subroutine and proceed to step S133
Transition. If the count value is “2”, step S12
Executes subroutine to rotate paddle wheel 6 in 3
And the transfer request flag is set in step S124.
It is determined whether or not it is set to “1”. "1"
If it is set, that is, the next original is
If it is waiting for pair 15, the process proceeds to step S126,
If it has been reset to "0",
If the original to be processed is the final original, the main
Turn off the motor. Subsequently, in step S126, the discharge
Set in step S127.
Then, the process is reset to step S133. On the other hand, in step S120, a normal
If it is determined that the transfer mode is set, the transfer is performed in step S128.
Confirm that the transmission request flag is set to "1".
Then, the main motor is turned off in step S129. So
Then, in step S130, the discharge trailing end detection counter is reset.
The discharge timer is set in step S131.
Sable to rotate paddle wheel 6 in step S132
Then, the process proceeds to step S133. Next, in step S133, the end of the discharge timer is determined.
After the completion, the discharge timer is turned off in step S134,
In step S135, the discharge request flag is reset to "0"
Then, in step S136, the discharging operation flag is reset to “0”.
set. This completes the discharge processing subroutine.
I do. (Other Embodiments) The paper according to the present invention
The transport device is not limited to the above embodiment, but
Various changes can be made within the scope of the gist. example
In other words, it is not always necessary to use
Registration means for once registering the fed document
Is not a roller pair but a plate-shaped or claw-shaped gate member.
You may. Also, measure the interval between the first and second originals.
There are various means other than the rotation pulse signal of the main motor.
And their control procedures are the same.
It is. As is clear from the above description, the present invention
According to the document, paper is fed one by one and conveyed, and the preceding paper is
A transporter that is continuously driven while stopped at a fixed position
Depending on the interval between the two originals, the subsequent paper is detected by the step
Conveys and stops subsequent paper at a predetermined position with respect to previous paper
So that the two sheets are
Can be juxtaposed with good alignment.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an internal configuration of an ADF according to an embodiment of the present invention. FIG. 2 is a block diagram showing a control circuit of the ADF. FIG. 3 is a flowchart showing a main routine of control by the control circuit. FIG. 4 is a flowchart showing a subroutine of communication processing by the control circuit. FIG. 5 is a flowchart showing a subroutine of a sheet feeding process by the control circuit. FIG. 6 is a flowchart showing a subroutine of a transport process by the control circuit. FIG. 7 is a flowchart showing a subroutine of a transport process by the control circuit, and is a continuation of FIG. 6; 8 is a flowchart showing a subroutine of a transport process by the control circuit, and is a continuation of FIG. 7; FIG. 9 is a flowchart showing a subroutine of a transport process by the control circuit, and is a continuation of FIG. 8; FIG. 10 is a flowchart showing a subroutine of a discharging process by the control circuit. FIG. 11 is a flowchart showing a subroutine of a discharging process by the control circuit, and is a continuation of FIG. 10; FIG. 12 is a flowchart showing a subroutine of a discharging process by the control circuit, and is a continuation of FIG. 11; DESCRIPTION OF SYMBOLS 11: paper feed roller 13: separating roller 15: registration roller pair 30: document conveying belt 40: stopper 80: platen glass 100: microprocessor SE3: photo sensor for document detection

Continued on the front page (58) Fields investigated (Int.Cl. ⁶ , DB name) G03G 15/00 107 G03G 15/00 510-534 G03G 21/00 370-502 B65H 5/02-5/06 B65H 7 / 00-7/20

Claims (1)

(57) [Claims] Paper feeding means for sequentially feeding a plurality of sheets one by one, conveying means for conveying the fed paper in one direction, and a sheet conveyed by the conveying means and a subsequent sheet A detecting means for numerically detecting the interval, and a stop position of the succeeding sheet with respect to the preceding sheet is a predetermined position.
According to the interval detected by the detection means
Te, after being stopped ahead of the paper at a predetermined exposure position
A sheet transport device comprising: a control unit that determines a transport amount of a transport unit that transports a sheet.