JPH0398932A - Automatic document feeder - Google Patents

Abstract

PURPOSE:To prevent the rear sides of documents on and after the second from being stained by providing a document stopper which is displaced so as to intercept the transfer passage after the original has been once separated by a separation means, in the case where the document is separated after it has been taken out. CONSTITUTION:In the case where documents D are set in an original tray 33, the ends thereof are regulated by a document stopper 37; while in the case where originals are separated, after the documents sent by multiple feeding are once separated by a separation means 38, a part of the documents on and after the second are pushed upwards to stop the transfer, so that the ends thereof are prevented from reaching the separation means 38. As a result, after separation, the documents on and after the second are not again engaged with the separation means 38. After once separated, the separation of the originals on and after the second is promoted by the document stopper 37, and as to the separation means 38, thereafter, only transfer operation is continued.

Description

[Detailed Description of the Invention] [Purpose of the Invention (Industrial Application Field) The present invention is directed to an automatic document feeder installed in an image forming apparatus, particularly to prevent a document from being stuck when setting the document on a document tray. The present invention further relates to an automatic document feeder that facilitates separation operations by separation means.

(Prior Art) In image forming apparatuses such as copying machines, in recent years, due to the diversification of devices and the demand for higher performance, originals are automatically placed at the exposure position on the original platen, and the originals are further removed after exposure. Automatic document feeders that automatically eject documents from a document table are often used.

In such an automatic document feeder, conventionally, as a means to take out the original from the original tray and separate and convey it, two orthogonal planar protrusions are used to regulate the setting position of the original and to take out the original. After the document is taken out using a pickup roller having a section, the document is directly guided to a separation means consisting of a supply roller and a separation roller, and separated and conveyed.

That is, when setting a document on the document tray, the leading edge of the document is regulated by one protrusion of the big-up roller lowered into the conveyance path, and when the document is taken out, the topmost document is fixed by sliding contact with the protrusion. is taken out in the direction of the separating means, and then raised to stop the taking out operation. On the other hand, in the separation means, the supply roller rotates in the conveyance direction, but during multiple feeding, the document is rotated in the separation direction, but at other times, the separation roller is driven by the supply roller. It performs separate transportation.

However, in such a device, the document taken out from the pick-up roller is supplied as is to the separation means, and therefore, among the multiple documents taken out by the pickup roller, only the top one is transported. , the second and subsequent sheets are always subjected to a separation operation by a separation roller. Moreover, since the pressure contact force between the supply roller and the separation roller is strong, when separating the document caught in the separation means, the upper document image is rubbed and the back of the lower document is stained. There is also the problem that the supply roller is contaminated or is constantly in a state of separation operation, so that a load is constantly applied to the supply roller and it is easily worn out, which hinders its longevity.

(Problem to be Solved by the Invention) Conventionally, originals are directly separated and conveyed by a separating means after being taken out from the original tray, and during multiple feeding, the original is always in a separating operation state, and the first The manuscript is 2
It may rub against the back of the original after the first page, staining the back of the original, or
Alternatively, there is a problem in that the supply roller is worn out and its lifespan is hindered.

Therefore, the present invention eliminates the above-mentioned problem. After the separation operation in the separation means, the second and subsequent documents will not be caught in the separation means again, preventing the documents from being soiled, and improving reliability. The purpose is to provide a high-quality device and extend the life of the device by preventing wear of the supply roller.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a take-out means for taking out the originals on the original tray, and separates and conveys the originals from the take-out means one by one. A stopper is provided between the separation means and the conveyance path from the take-out means to the separation means, and is movable to a first position for blocking at least a portion of the conveyance path and a second position for opening the conveyance path. .

(Function) According to the above-mentioned means, during the separation operation by the separation means, the present invention
The stopper that shields the conveyance path facilitates the separation operation, prevents the second and subsequent documents from being caught in the separation means after separation, improves the reliability of the device by preventing the documents from becoming dirty, and improves the reliability of the device. This prevents roller wear and extends the life of the separation means.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 7. Figure 1 shows the entire image forming apparatus.
Reference numeral 1 denotes an apparatus main body which incorporates image forming process means 2 such as charging, exposure, development, transfer, cleaning, fixing, etc., and an automatic document feeder 3 is provided on the upper surface of this apparatus main body 1. A drum-shaped photoreceptor 10 is provided approximately in the center of the apparatus main body 1, and around the photoreceptor 10, a charging device 11 and an exposure section 12a1 of an exposure device 12 are installed in order along the rotation direction of the photoreceptor 10.
A developing device 13, a transfer peeling charger 14, a cleaning device 16, and a static eliminator 17 are provided in this order. Further, on the right side of the device main body 1, there is a first cassette 1 that stores paper P.
8a and a second cassette 18b are provided. or,
Inside the device main body 1, each cassette 1 8 a, 1 8
A transport path 22 is formed which leads the paper P taken out from the paper P by the big up rollers 20a and 20b, through the photoreceptor 10, to the paper discharge tray 21 provided on the left side of the apparatus main assembly. First and second separation rollers 23a, 23b, and registration rollers 24 are arranged on the upstream side of the photoreceptor 10 in this transport path 22, and a transport belt 26, a fixing device 27, and a paper ejection roller 28 are arranged on the downstream side. has been done. On the other hand, a document table 30 is provided on the upper surface of the apparatus main body 1 .

Next, the automatic document feeder 3 will be described. The automatic document feeder 3 includes a document holding cover 3 that can be opened and closed and has a platen sheet 31 for holding down a document D set on a document table 30.
2 and the original D set on the original tray 33 are taken out one by one and automatically fed to the exposure position on the original platen 30,
Next, after the exposure is completed, the document feed mechanism section 34 discharges the document onto the upper surface of the document holding cover 32.

Here, in the document feeding mechanism section 34, above the front part of the document tray 33, a pick-up roller 36, which is a take-out means and is for taking out the document D, is provided so as to be movable up and down.
A first actuator 61a of a first switch 61 that detects the presence or absence of a document D is provided. Furthermore, while reaching the document table 30 from the document tray 33, a document stopper 37, a separation means 38 consisting of a supply roller 38a, a separation roller 38b, an aligning roller 40, and a reversing roller 41, which is one of the conveying means, are operated. curved first
A document reversing means 43 consisting of a guide 42, and a reversing port ~
A discharge mechanism section 47 consisting of a discharge port-ra 44 and a second arc-shaped guide 46 is driven by a pulse motor 99 to send the document D to an exposure position on the document table 30. A feed roller 48 is provided to take out the sheet in the direction of the discharge mechanism section 47 after exposure. The document stopper 37 blocks the conveyance path 39 from the pickup roller 36 to the separating means 38, as shown in FIGS. As shown in FIG. 4 (opening), it can be moved to a first position where the transport path 39 is opened, and a second position where the conveyance path 39 is opened. Further, 62a is a second actuator 63 of the second switch 62 for detecting a jam of the document D.
g is a third actuator of a third switch 63 that detects the trailing edge of the document D; The length of the original D is detected based on the time taken from when the leading edge of the original D passes the second switch 62 until the rear end of the original D passes the third switch 63. Furthermore, 64a is a fourth actuator of a fourth switch 64 that detects the trailing edge of the document D in order to time the drive of the feed roller 48; 41, a fifth switch 66 detects the leading edge of the document D.
This is the fifth actuator.

Note that a sixth switch and a sixth actuator (not shown) are provided in parallel with the fourth switch 64 to detect the width of the document D and determine the length using the second and third switches 62 and 63. By this detection, the size of the document D is detected.

Further, 50 is a reversing gate that switches the conveyance path depending on whether the original D is ejected onto the holding cover 32 or sent to the original reversing means 43 side, and 51 is a gate that obstructs ejection when the original D is ejected from the exposure position. This is a biasing plate that biases the document D while it is passing through, although it can be switched so as not to do so. A stopper 52 is driven by a solenoid (not shown) and restricts the rear end of the document D placed on the document table 30. The big up roller 36, document stopper 37, and feed roller 48 are rotated simultaneously by the operation of a solenoid 53, as shown in FIG. That is, the pickup roller 36 is rotated via a first arm 56, a second arm 57, and a third arm 58 attached to the first shaft 54. Further, the document stopper 37
arm 56 , a fourth arm 70 attached to the first shaft 54 , a fifth arm 72 pivoted about the first fixing stud 71 , and a fifth arm 72 attached to the second shaft 73 . It is rotated together with the second shaft 73 between the first position and the second position via the sixth arm 74 . Furthermore, the feed reroller 48 also has a seventh arm 77, an eighth arm 78, a fourth shaft 79, and a ninth arm attached to the third shaft 76 via the first shaft 54 and a link mechanism (not shown). It is rotated via the arm 80 of. Note that 81 is a first spring that biases the first arm 56, and 82 is a sixth arm 7.
A second spring 83 urges the pickup roller 36, the supply roller 38a . Separation roller 38b, aligning roller 40, reversing roller 41, discharge port roller 4
This is the first motor that drives No. 4. Also, 84 is the first
The motor 83 is driven by each roller 36, 38a, 38b,
A first gear 85, a first belt 86, a second gear g7, and a fifth gear are part of a transmission mechanism that transmits the drive of the first motor 83 to the supply roller 38a. It has a shaft 88 of. Further, the transmission mechanism 84
A third gear 90, a second belt 91, and a fourth gear 92 that transmit the drive of the motor 83 to the big up roller 36.
, has a sixth shaft 93. Furthermore, the transmission mechanism 84
A fifth gear 94 that transmits the drive of the first motor 83 to the separation roller 38b, a third belt 96, a sixth gear 97,
It has a seventh shaft 98. Note that each gear has a built-in clutch for adjusting the rotational speed or drive timing of each roller 36, 38a, 38b. Furthermore, the first
The drive of the motor 83 is also transmitted to the aligning roller 40, reversing roller 41, and discharge roller 44 by a drive transmission means (not shown).

Further, the first to sixth switches 6 of the automatic document feeder 3
1 to 65 are connected to a control device 100 that also controls the image forming process 2 and the like. Furthermore, the solenoid 53, the pulse motor 99, the first motor 83, and the reversing gate 50 are also controlled by the control device 100.

Next, we will discuss the effect. First, the case where the image of the document D is on only one side will be explained with reference to the flowchart shown in FIG. To start copying, the original D is placed on the original tray 33, but at this time, the original stopper 37
is in the first position shown in FIG. 4(A), shielding the conveyance path 39, and the leading edge of the document D is prevented from thrusting into the separation means 38 side by the document stopper 37, and its set position is , regulated. In this state, various image forming conditions such as paper size, number of copies, magnification, single-sided copying, etc. are input from an operation panel (not shown).

As a result, the inversion gate 50 is set at the position shown by the solid line in FIG. Next, the process proceeds to step 101, where a copy button (not shown) is turned on to start copying, and the process proceeds to step 102. In step 102, the control device 100 turns on the first switch 61, which detects the presence or absence of the document D.
manually, and proceed to step 103. In step 103, the control device 100 turns on the solenoid 53 and the first motor 83. As a result, the first arm 56 is rotated in the direction of the arrow O against the first spring 81, and the second arm 57 is rotated in the direction of the arrow 0 via the first shaft 54. The end of the arm 58 on the second arm side is released, and the end on the pickup roller 36 side is lowered by the weight of the pickup roller 36, and the pickup roller 36 is placed on the uppermost document D. be placed. At the same time, the pickup roller 36, the supply roller 3ga of the separation means 38, and the separation roller 38b are rotated in the direction of the arrow p, the direction of the arrow q, and the direction of the arrow r, respectively, via the transmission mechanism 84. However, the separation roller 38b is rotated in the direction of the arrow r in the separation direction when separating multiple-fed originals, but if the original D is not inserted or if the original D is being fed single-sheet, it will rotate further. After the separation is completed, the supply force is stronger than the separation force, so the supply roller 38a
, and is rotated in the direction of arrow r', which is opposite to the direction of arrow r. On the other hand, by turning on the solenoid 53, the fourth arm 70 is rotated in the direction of arrow O via the first shaft 54. As a result, the fifth arm 72 is rotated in the direction of the arrow S, the sixth arm 74 is further pushed downward against the second spring 82, and the document stopper 37 is rotated together with the second shaft 73. It is rotated and lowered in the t direction to open the conveyance path 39. That is, by turning on the solenoid 53, the document stopper 37 is displaced from the first position shown in FIG. 4(A) to the second position shown in FIG. 4(Open). Furthermore, by turning on the solenoid 53, the feed roller 48 also moves the first shaft 54, the link mechanism (not shown), the third shaft 76, the seventh arm 77, the eighth arm 78, and the fourth shaft 7.
9, is lowered via the ninth arm 80. That is, by turning on the third solenoid 53, the big up roller 36
, the document stopper 37, and the feed reel roller 48 are lowered simultaneously. Then, in step 103, the uppermost document D is taken out by the big up roller 36, separated by the separating means 38 as shown in FIG. , step 104
Proceed to.

That is, before the document reaches the document, the separation roller 38b is rotated in the direction of the arrow r° following the supply roller 38a, as shown in FIG.
If only one original is taken out, the feeding force by the supply roller 38a is strong, so the separation roller 38b is pulled by the original and rotated in the direction of arrow r', which is the transport direction.

On the other hand, when multiple documents are taken out by the big up roller 36, the separation roller 3
Since the separation force of 8b is strong, the separation roller 311lb is rotated in the separation direction of arrow r, and returns the second and subsequent documents among the plurality of documents once caught in the separation means 38 in the separation direction. That will happen. However, once separated, the separation roller 38b is pulled by the first document and rotated again in the conveying direction of arrow r; however, if the document stopper 37
If it remains in the second position without being displaced to the first position, the second and subsequent originals will be bitten by the separating means 38 again due to the frictional force with the first original. The separation means 38 repeats the separation and conveyance in this way, in which case the separation operation is restarted. However, after separation by separation means 38, in step 104, document stopper 37 is displaced to the first position where it blocks conveyance path 39. That is, in step 104, when the third solenoid 53 is turned off and the first arm 56 is rotated by the first spring 81 in the direction opposite to the direction of arrow 0, the kick-up roller 36, the document stopper 37, and the feed The reroller 48 is raised. and the fourth
As shown in Figure (C), the document stopper 37 is again displaced to the first position where it blocks the conveyance path 39, and pushes up a portion of the multiple-feed documents, causing the document stopper 37 to be moved to the first position where it blocks the conveyance path 39, and to push up a portion of the multiple-feed documents, and to prevent the document from falling on the second and subsequent documents. teeth,
By bending the middle part and preventing the tip from reaching the separating means 38, the conveying of the second and subsequent documents by the separating means 38 is prevented, and by preventing the document from being caught in the separating means again. , which facilitates the separation operation. Next, in step 106, the ON signal of the second switch 62 and the OFF signal of the third switch 63 due to the document D are input to the control device 100, and the length of the document D is detected.

During this time, the document D is moved after turning on the first motor 83.
After the leading ends are aligned by the aligning roller 40 which is rotated with a certain time delay, the sheet is conveyed in the direction of the feed roller 48. When the process further proceeds to step 107, the fourth switch 64 and the sixth switch (not shown) are turned off as the document D passes, so that the trailing edge and width of the document D are input to the control device 100, and the size of the document D is inputted to the control device 100. Detect, step 1
Proceed to 08. At this time, manuscript D is considered free,
Its leading end is inserted into the document table 30 side. In step 108, the solenoid 53 is turned on and the first solenoid 53 is turned on.
While the motor 83 is turned off, the pulse motor 99 is turned on and rotated by a predetermined number of pulses. As a result, the pick-up roller 36, document stopper 37, and feed roller 48 are all lowered, and the feed roller 48 moves the document D onto the document table 30 by a predetermined number of rotations in the direction of arrow U by the pulse motor 99. The rear end is the stopper 5.
The process stops at a position slightly past 2, and proceeds to step 110. In step 110, a solenoid (not shown) is turned on, the tip of the stopper 52 is placed on the document table 30, and the feed roller 48 is rotated a predetermined number of times in the direction opposite to the arrow U direction by the pulse motor. Bring the rear end into contact with the stopper 52, set the document D at the exposure position, and proceed to step 11.
Go to 1. In step 111, the control device 100 turns off the solenoid 53, raises the pickup roller 36, document stopper 37, and feed roller 47, and in step 1
Proceed to step 12. In step 112, an image forming process is performed in the apparatus main body 1. In other words, in the apparatus main body 1, as the photoreceptor 10 rotates, the photoreceptor 10 is uniformly charged by the charging device 11 and the exposure area is At 12a, an electrostatic latent image corresponding to the original D image is formed. Next, as the photoreceptor 10 rotates, it is developed and visualized in a developing device 13, and reaches a transfer peeling charger 14. Meanwhile, in synchronization with this, paper P of the size specified on the operation panel (not shown) is placed in one of the cassettes 18a, 18.
The paper P is fed from the separation roller 23a, 23
b, and is sent to the transfer/separation charger 14 via the registration roller 24. Then, the paper P on which the toner image on the photoreceptor 10 has been transferred and peeled off from the photoreceptor 10 is conveyed to the fixing device 27 side and fixed thereon, and then is ejected onto the ejection tray 21 by the ejection roller 28. On the other hand, after the transfer is completed, residual toner is removed from the photoreceptor 10 by the cleaning device 16, and electricity is removed by the static eliminator 17, and the photoreceptor 10 is brought into a state ready for the next copy, and the process proceeds to step 113. In step 113, a comparison is made to see if the required number of copies has been completed. If not, the process returns to step 112, and if it has been completed, the process proceeds to step 114. In step 114, the solenoid 53 is turned on, the big up roller 36, document stopper 37, and feed roller 48 are lowered, and the pulse motor 99 is turned on in reverse rotation for a predetermined period of time until the rear end of the preceding document D reaches the discharge roller 44. Then, the feed roller 48 is rotated in the direction opposite to the direction of arrow U, the tip of the stopper 52 is raised, and the biasing plate 51 is moved by a solenoid (not shown).
is rotated in the direction of arrow V for a certain period of time, the document D is ejected from the document table 30, and the process proceeds to step 116. In step 116, by turning on the fifth switch 66, the first motor 83 is turned on.
is turned on, the discharge roller 44 is rotated, the aligning roller 40 is rotated after a delay of a predetermined time, and the solenoid 53 is turned off after a delay of a predetermined time. At this time, since the inversion gate 50 is in the position shown by the solid line in FIG.
The preceding document D advances through the second guide 46 and exits through the ejection port.
The document is discharged onto the upper surface of the document holding cover 32 by the roller 44. On the other hand, if there is a second document D, it is taken out from the document tray 33 by the big up roller 36 and separated by the separation means 38.
After being separated and conveyed by the aligning roller 44, the sheet is conveyed in the direction of the feed roller 48. By the way, Big. The up roller 36, the original stopper 37, and the feed roller 48 are
After taking out the second document by the big up roller 36,
It is raised by turning off the solenoid 53. The document stopper 37 pushes up a portion of the document, preventing the leading edge of the document below from reaching the separation means 38, and facilitates the separation operation, as in the case of the first document. becomes. Next, in step 117, it is compared whether the signal from the first switch 61 after the document D is taken out in step 103 is on or off. If the signal is off, step 11
8, and if it is on, proceed to step 120. In step 118, the fifth switch 6 is activated by the trailing edge of the document D.
After a predetermined time delay due to the turning off of step 6, the first motor 83 is turned off, and all motors driven by the first motor 83 including the ejection roller 44 are turned off, and all automatic document feeding is completed. In step 120, turning off of the fourth switch 64 due to the trailing edge of the subsequent document D is detected, and in step 10
Proceed to step 8. Thereafter, steps 108 to 120 are repeated until all the documents D on the document tray 33 are exhausted. Note that when the final document D is supplied, the document tray 3
When there is no more original document D on 3 and the first switch 61 detects this, the process advances to step 118 and all automatic document feeding ends.

Next, a case will be described in which images on both sides of the document D are copied. In addition, in double-sided copying, in order to start copying from the second side so that the originals are aligned and aligned at the end of copying, the original side is first reversed in the document feeder 3, and then The operation is the same as that for single-sided copying, except for reversing the document side after the two-sided copying is completed, so the above explanation of single-sided copying will be referred to for the similar parts. First, at the start of copying, when double-sided copying is specified from an operation panel (not shown), the reversing gate 50 is set to the position shown by the dotted line in FIG. 2. Then, the process proceeds to step 130, and when a copy button (not shown) is turned on, the process proceeds to step 132 through step 131, which is similar to steps 102 to 107. Step 1
32, after turning off the first motor 83, the solenoid 5
3 is turned on, the pulse motor 99 is turned on, and the feed remoter 48 is rotated a predetermined number of times in the direction of arrow U.
The document D is conveyed to the document table 30 side, and the process proceeds to step 133. In step 133, the biasing plate 51 is rotated in the direction of arrow V, and the pulse motor 99 is reversely driven a predetermined number of times, and the feed roller 48 rotated in the direction opposite to the direction of arrow U.
The document D is taken out from the document table 30 toward the second guide 46 and the process proceeds to step 134. In step 134, the fifth switch 66 is turned on by the leading edge of the document D, and the process proceeds to step 135. In step 135, after a predetermined time delay, the solenoid 5
3 is turned off, the reversing roller 41 is rotated by turning on the first motor 83, and furthermore, after a certain time delay, the aligning roller 40 is rotated, and the document D passes through the reversing gate 50 and moves to the first guide. 42, the surface is inverted, and the process proceeds to step 136. In step 136, the fourth switch 64 is turned off by the trailing edge of the document D, which turns off the first motor 83, turns on the solenoid 53, and turns on the pulse motor 99, thereby moving the document D onto the document table 3.
Transport to the side. After this, from step 110 to step 1
The process proceeds to step 138 via step 137 similar to step 14. In step 13g, it is compared whether copying of both sides of the document D has been completed. If it has been completed, the process advances to step 139, where the reversing gate 50 is reversed to the position shown by the solid line in FIG. and step 1
From step 16, the process proceeds to step 140, which is similar to step 118. After step 118 has passed, all document feeding and copying operations are completed, while step 120
After the elapse of time, the process returns to step 132. Also, step 138
If double-sided copying is not completed, proceed to step 13.
It will be reverted to 4.

With this configuration, when the document D is set on the document tray 33, the leading edge of the document D can be regulated by the document stopper 37, while at the time of document separation, multiple fed documents are separated by the separation means 38. Once separated by
The document stopper 37 pushes up a part of the second and subsequent documents upwards and prevents them from being conveyed, and prevents the leading edge from reaching the separation means 38, so that after separation, the second and subsequent documents are separated again. There is no possibility of being caught by the means 38.

Therefore, unlike in the prior art, there is no need for the separation means 38 to repeatedly separate and transport documents that have been fed multiple times. Once separated, the separation of the second and subsequent documents is facilitated by the document stopper 37, and the separation means 3
8, only the conveyance operation will continue thereafter. This prevents the image of the first document from being repeatedly rubbed against the back side of the second document and staining the back side of the document, which is the case in the past, which helps preserve the document and improves the reliability of the device. It is possible to aim for Further, by repeating the separation operation, the supply roller 38a does not wear out quickly, and the life of the separation means 38 can be extended.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be modified in various ways. For example, the shape of the kick-up roller that is the take-out means can be changed arbitrarily, and as described in connection with the conventional device, two orthogonal planes can be used. It is also possible to have a protrusion in the shape of a shape. However, in the case of a pickup roller having a protrusion, noise is generated when the protrusion hits the document when the document is taken out, and the stop position of the pickup roller after the document is taken out is specified. There are some problems, such as complication.

Therefore, by using a cylindrical pickup roller as in the embodiment, it is possible to provide a more excellent device in terms of preventing noise and simplifying the drive mechanism. Further, the structure of the means for displacing the document stopper is also arbitrary.

[Effects of the Invention] As explained above, according to the present invention, when a document is set on the document tray in an automatic document feeder, the document stopper can restrict the leading edge of the document, and after the document is taken out, the document can be stopped. When separating documents, once they are separated by the separating means, a document stopper that is displaced to cover the conveyance path prevents the leading edge of the second and subsequent documents from reaching the separating means, facilitating the separating operation. I will do it. Therefore, unlike in the past, after separation, the second and subsequent documents will not be caught in the separation means again, and the back side of the second and subsequent documents, which conventionally occurred, will be prevented and the document will be preserved. Therefore, a highly reliable device can be obtained. Further, the wear of the supply roller is reduced compared to the conventional one, and the life of the separation means is extended.

[Brief explanation of drawings]

1 to 7 show one embodiment of the present invention, FIG. 1 is a schematic explanatory diagram of the entire image forming apparatus, FIG. 2 is an explanatory diagram of the automatic document feeding mechanism, and FIG. 3 is an explanatory diagram of the automatic document feeding mechanism. A schematic perspective view of a portion of the feeding mechanism. Figure 4 shows the operation of the big-up roller and document stopper. (A) is an explanatory diagram when a document is set on the document tray. (B) is the document taken out by the big-up roller. Fig. 5 is a schematic block diagram of the control system, Fig. 6 (a)
, (opening) is a flowchart of the single-sided copy operation, and FIG. 7 is a flowchart of the double-sided copy operation. DESCRIPTION OF SYMBOLS 1... Apparatus main body, 3... Automatic document feeder, 10... Photoreceptor, 30... Original platen, 32...
...Document holding cover 33...Document tray, 34...Document feeding mechanism section, 36...Pickup roller, 37...Document stopper, 38...Separation means, 53...Solenoid.

Claims (1)

[Claims] An automatic document feeder that sequentially feeds originals one by one from an original tray to an exposure position and ejects the originals after exposure, includes a take-out means for taking out the originals on the original tray, and a take-out means for taking out the originals from the take-out means, one sheet at a time. a separating means for separating and conveying the separated parts; and a first separating means that is provided between the conveying path from the take-out means to the separating means and that shields the conveying path.
and a document stopper that is displaced to a second position that opens the conveyance path, and the document stopper opens the conveyance path in conjunction with the take-out operation of the take-out means. Feeding device.