JPH0557182B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a document conveying device that is disposed in an image reading device such as a copying machine and conveys a document to the image reading device.

(B) Prior Art Conventionally, there is a document conveying device that is disposed in an image reading device such as a copying machine and sequentially conveys documents to an image reading position of the image reading device.

The document conveying device transports and stops documents one by one, regardless of size, to the image reading position on the platen glass, and after reading the image, ejects the scanned document from the platen glass and transfers the document to the next document. The process of transporting the camera to the image reading position, stopping it, and reading the image was repeated.

However, this method has the disadvantage that as the size of the originals becomes smaller, the space between the originals (paper gap) increases, resulting in a loss of conveyance time and lowering efficiency. Further, if the conveyance speed of the document is increased unnecessarily, noise and abrasion of the conveyor belt will increase, and damage to the document will also increase when a conveyance failure occurs.

Therefore, recently, methods for feeding documents in copying machines have been proposed to solve this inconvenience (for example, Japanese Patent Application Laid-Open No. 60-140364, Japanese Patent Application Laid-open No. 61-32836).
Publication No.).

The method described in JP-A-60-140364 is
When continuously copying originals smaller than the copyable size, the first original placed on the original tray is placed at the copying position set downstream in the original transport direction on the platen glass surface of the copier. The document is conveyed, hits the stopper and stops, and then the second original is conveyed to a standby position set at an upstream position on the platen glass surface adjacent to the copying position, and stops when it hits the stopper. Then, as the first original after exposure is ejected downstream of the platen glass surface, the second original from the standby position is moved to the copying position and placed on the original tray. The procedure of transporting the third original document placed therein to the standby position and stopping the original is repeated.

In addition, the method described in Japanese Patent Application Laid-Open No. 61-32836 detects a distance slightly longer than the length of each document to be sequentially transported in the transport direction, and detects the transport cycle time required to run the transport belt for this distance. is set, and after the first document in the document tray is stopped being conveyed to the preset copy position on the platen glass at the downstream position in the document conveyance direction, the second document is transferred as described above. The document is conveyed and stopped at an appropriate interval at a standby position set upstream of the platen glass adjacent to the copying position, and the exposed first document is ejected downstream of the platen glass. In conjunction with this, the conveyor belt is run for the respective conveyance cycle times as described above, and the second document in the standby position is conveyed to the copying position, and the third document is conveyed to the standby position and then stopped. It was designed to be repeated.

(C) Problems to be Solved by the Invention By the way, in the method described in the above-mentioned Japanese Patent Application Laid-open No. 140364/1984, since the method is stopped at the standby position by a mechanical stopper, the size of A4, which is half of the maximum size of A3, is It is efficient when transporting originals, but
For example, with B5 and postcards, you can only wait at a predetermined position with a stopper, so
The disadvantage is that the gap between documents becomes wider than necessary, which reduces efficiency.Also, since the copying position on the platen glass is on the opposite side of the document tray, it is difficult to reach the copying position of one original. Even if the size A4 is half of the maximum size A3, the maximum transport time is required, which has the disadvantage that it is not necessarily the best in terms of efficiency.

In addition, in the method described in JP-A-61-32836, the positioning means for stopping the original at each position is not a mechanical stopper, but is based on stop position control of a conveyor belt, so that the original size can be adjusted. Since the paper spacing can be kept constant regardless of the size, the disadvantage of reduced efficiency due to size is eliminated. However, with this method, the procedure of moving the second and subsequent originals for a predetermined transport cycle time until they reach the copying position and stopping at the standby position is performed at least once, and this transport・The more stops are repeated, the greater the risk that even if the conveyor belt's stop position can be controlled somewhat smoothly, the belt and document may slip and misalign. There is a risk that this may cause a decrease in stopping accuracy, which is an important function of the document conveying device.

Furthermore, although this method eliminates the drawback of reduced efficiency due to differences in document size, it does have the drawback that it is difficult to control the spacing between documents. This is because the first document is conveyed, and when the trailing edge passes through the document tray, the second document is fed from the tray, but the speed of the paper feed roller is unnecessarily high. This poses a problem in that skewed document feeding and field errors are likely to occur, and it is difficult to match the speed of the conveyor belt, so the speed must be slower than that. Therefore, the gap between the documents becomes larger than necessary due to the speed difference, and although it is uniform regardless of the size, it has the drawback that it is not necessarily the best in terms of efficiency.

Furthermore, with this method, since the original before exposure is located at the same downstream position on the platen glass as the original being exposed, it is not possible to shorten the distance between the originals once the exposure operation has started. Before transporting documents, the distance between documents must be adjusted.
This has led to time loss and difficulty in control.Furthermore, in order to reduce the paper spacing, the arrangement of each drive unit has to be complicated, and furthermore, there is a risk that the document transport path must also be complicated. This may cause serious problems such as damage to the original.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a configuration in which a document is placed on standby close to a platen glass having a document reading position upstream, thereby solving the above-mentioned problems.

(d) Means for Solving the Problems The present invention has been made in view of the above-mentioned circumstances, and the present invention separates and feeds the document mounting table 42 and the originals G on the document mounting table 42 one by one. a feeding rotation means 45; a first conveyance rotation means 49a disposed downstream of the feeding rotation means 45;
a second conveying and rotating means disposed downstream of the conveying and rotating means 49a and guiding the document G conveyed by the first conveying and rotating means 49a to a predetermined reading position X on the platen of the image forming apparatus; 41
In the document G conveying device 7, which includes a first,
a second data means 85, 61; a first transmission means 107 for transmitting the rotation of the first motor means 85 to the feeding rotation means 45; a second transmission means 106 that selectively transmits the rotation of the second motor means 61 to the second transport rotation means 49a; a third transmission means 63 that transmits the rotation of the second motor means 61 to the second transport rotation means 41; a fourth transmission means 71 that transmits the rotation of the means 61 to the first conveyance rotation means 49a, but does not transmit the rotation of the first conveyance rotation means 49a;
When the feeding rotation means 45 rotates due to the rotation of the first motor means 85, the second transmission means 106 is temporarily cut off, and the first conveyance rotation means 49a is stopping the leading edge of the document G. When the preceding document G is set at a predetermined reading position X on the platen, the first motor means 85 is rotated to prevent the rotation of the first transport rotation means 49a. The trailing document G is preliminarily fed so that the leading edge thereof comes just before the second conveyance rotation means 41, and the second motor means 6
1 and the first and second conveyance rotation means 4
control means Y for controlling the first and second motor means 85 and 61 so as to guide the following document G to a predetermined reading position X on the platen by rotation of the motor means 9a and 41; It is characterized by

(E) Operation Based on the above-described configuration, the original G is transported toward a predetermined reading position X on the platen by the first and second transport rotation means 49a and 41. At this time,
Since the second transmission means 106 is temporarily cut off and the leading edge of the document G is restrained by the stopped first transport rotation means 49a, the oblique running of the document G is corrected.

On the other hand, during the reading operation of the preceding original G at the reading position It is preliminarily sent so that it comes just in front of the transport rotation means 41 of No. 2. Then, the document is fed to the reading position X following the preceding original G which is ejected from the reading position X at a constant distance regardless of the size.

Note that the above-mentioned symbols are shown for reference and do not limit the configuration in any way.

(f) Examples Examples of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, the copying machine M includes an apparatus main body 1
It has an image reading section 3 made of a platen glass 2 or the like on the upper part thereof, and an image recording section 6 made of a photosensitive drum 5 or the like below the image reading section 3.
Additionally, an automatic document feeder 7 is provided above the image reading unit 3.
is located.

A First, the device main body 1 will be explained.

In the image reading unit 3, 2 is the platen glass on which the original is placed, 9 is an illumination lamp that illuminates the original, 10a, 10b, 10c, and 10d are scanning mirrors that change the optical path of the reflected light from the original, and 11 is a combination. This lens has focusing and variable magnification functions. 12 is an optical system motor that drives the optical system, and 13, 15, and 16 are sensors, respectively. Further, 17 is an AE sensor that detects the density of a document or the like.

In the image recording section 6, 5 is the photosensitive drum, 19 is a main motor for driving the photosensitive drum 5, 20 is a high voltage unit, 21 is a blank exposure unit, 22 is a developing device, 23 is a transfer charger,
25 is a separation charger, and 26 is a cleaning device.

Further, 27 is an upper cassette that accommodates the transfer paper P, 29 is a lower cassette, 30 and 31 are paper feed rollers, and 32 is a registration roller. Furthermore, 33 is a conveyor belt that conveys the transfer paper P on which an image has been recorded to the fixing side, 35 is a fixing device that fixes the conveyed transfer paper P, 36 is a paper discharge roller, 37 is a paper discharge tray, and 39 is a double-sided This is a sensor used for recording.

The surface of the photosensitive drum 5 is made of a seamless photoconductor using a photoconductor and a conductor.
The drum 5 is rotatably supported and starts rotating in the direction of the arrow by a main motor 19 that is activated in response to pressing a copy start key, which will be described later. Next, when the predetermined rotation control and potential control processing (preprocessing) of the photosensitive drum 5 are completed, the document G placed at the exposure position X on the platen glass 2 is
is illuminated by an illumination lamp 9 integrated with the first scanning mirror 10a, and the reflected light from the original G is transmitted to the first scanning mirror 10a, the second scanning mirror 10b, the third scanning mirror 10c, the lens 11 and the fourth scanning mirror 10a. The photosensitive drum 5 passes through the scanning mirror 10d.
image on top.

The photosensitive drum 5 is corona charged by a high voltage unit 20. After that, the image (original image) illuminated by the illumination lamp 9 is exposed to slit light.
An electrostatic latent image is formed on the drum 5.

Next, the electrostatic latent image on the photosensitive drum 5 is developed by the developing roller 22a of the developing device 22 and visualized as a toner image, and the toner image is transferred onto the transfer paper P by the transfer charger 23 as described later. be done.

That is, the transfer paper P in the upper cassette 27 or the lower cassette 29 is fed into the main body 1 by the paper feed roller 30 or 31, and the toner image on the photosensitive drum 5 is transferred to a predetermined position on the transfer paper P by the register roller 32. The photosensitive drum 5 is sent to the photosensitive drum 5 with accurate timing so that the photosensitive drum 5 is sent. After that, the transfer charger 23 and the photosensitive drum 5
The toner image on the drum 5 is transferred onto the transfer paper P by passing the transfer paper P between the drum 5 and the drum 5 . After this transfer is completed, the transfer paper P is transferred to the photosensitive drum 5.
is separated by a separation charger 25, guided to a fixing device 35 by a conveyor belt 23, fixed by pressure and heating, and then transferred to a discharge roller 36.
The paper is discharged to the paper discharge tray 37 outside the main body 1.

Further, the photosensitive drum 5 after the transfer continues to rotate and is cleaned by the cleaning device 26.
The surface is cleaned.

B Next, the automatic document feeder (hereinafter referred to as ADF) 7 will be explained.

As shown in detail in FIG. 1, the ADF 7 has a full-surface belt 41 disposed to face the platen glass 2 of the apparatus main body 1, and
A document loading tray 42 on which a large number of documents G can be stacked and set is provided above the entire surface belt 41.
The full-surface belt 41 is an endless belt having a width that can cover the entire surface of the sheet document on the platen glass 2, is supported by a drive roller 51a and a turn roller 51b, and is configured so as not to slip with the drive roller 51. In addition, the surface thereof has a sufficient coefficient of friction so that the document can be slid and conveyed on the platen 2 by frictional force.
Further, the document stacking tray 42 is arranged so as to be inclined so that the downstream side in the document feeding direction is lower, and the documents G stacked on the document stacking tray 42 are stacked aligned on the downstream side. A semicircular paper feed roller 43 is disposed downstream of the document stacking tray 42, and rotates in the direction of the arrow to feed the document G on the document stacking tray 42 downstream. If not, it is controlled so that it stops with the string section pointing upwards. Further, a separation section conveyance roller 45 is arranged downstream of the half-moon-shaped paper feed roller 43, and a drive roller 46 is disposed opposite to the separation section conveyance roller 45.
A separation belt 47 wound around a and a driven roller 46b is arranged, and the separation section is constituted by the separation section transport roller 45 and the separation belt 47, and the document G on the document stacking tray 42 is separated from the original document. A separation conveyance roller 45 that rotates in the feeding direction and a separation belt 47 that rotates in the document return direction.
Separate the sheets one by one starting from the lowest one by
It is now being transported. Furthermore, a feed roller consisting of a driving roller 49a and a driven roller 49b is arranged downstream of the separating sections 45, 47, and a first sheet path is formed from the separating sections 45, 47 to the feeding rollers 49a, 49b. It is configured. Moreover, the feed roller 49a,
49b to the platen glass inlet 42a near the drive roller 40a that supports the full-surface belt 41
The document G sent from the separation units 45 and 47 passes through the first sheet path, and then passes through the feed rollers 49a and 49a.
49b and sent through the second sheet path to the third sheet path formed on the platen glass 2 by the full-surface belt 41 rotating in the direction of the arrow shown by the solid line from the platen glass inlet 2a. It is stopped at an exposure position X, which is configured with the vicinity of the platen glass entrance 2a on the platen glass 2 as a home position.

Further, a large reversing roller 50 is arranged near the feed rollers 49a and 49b, and a reversing roller 51 is arranged below the large reversing roller 50. And platen glass entrance 2
A fourth sheet path is configured from a to the joint between the large reversing roller 50 and the reversing roller 51, and a fifth sheet path is configured around the outer periphery of the large reversing roller 50. The path is from the reversing roller 51 to the reversing large roller 5
0 and joins the first sheet path on the upstream side of the feed rollers 49a and 49b, and the document G on the platen glass 2
is conveyed to the fourth sheet path by the reverse rotation of the full-surface belt 41 as shown by the broken line, and is sandwiched between the large reversing roller 50 and the reversing roller 51, and is conveyed in the direction of the arrow shown by the solid line of the large reversing roller 50. The sheet is rotated to be sent to a fifth sheet path, held between feed rollers 49a and 49b, passed through a second sheet path, turned over, and sent onto the platen glass 2 again.

Further, a document ejection tray 52 is arranged above the full-surface belt 41, and a sixth sheet path is configured from the platen glass outlet 2b near the turn roller 40b that supports the full-surface belt 41 to the document ejection tray 52. There is. Upstream discharge rollers 53a and 53b are disposed on the upstream side of the sixth sheet path, and a downstream discharge roller 5 is disposed at the downstream end facing the document discharge tray 52.
5a and 55b are arranged, and the original G on the platen glass 2 is sent from the platen glass outlet 2b to the sixth sheet path by the full-surface belt 41 that rotates in the direction of the arrow shown by the solid line, and is sent to the sixth sheet path in the upstream section. The document is held between the discharge rollers 53a, 53b and the downstream discharge rollers 55a, 55b, respectively, and is discharged onto the document discharge tray 52.

On the other hand, a transmission type document detection sensor S1 is arranged downstream of the document stacking tray 42, and the document detection sensor S1 is composed of an LED (light emitting diode) 56a and a phototransistor 55b, which are arranged facing each other. The presence or absence of a document G on the document stacking tray 42 is detected. Further, a transmission type paper feed sensor S2 is arranged at a position close to the upstream side of the feed rollers 49a and 49b, and the paper feed sensor S2 consists of an LED 57a and a phototransistor 57b arranged oppositely, and is arranged at the leading edge and the rear of the document. Detect the edge. Further, a reflective sheet discharge sensor S3 is arranged in the middle of the sixth sheet path, and the sheet discharge sensor S3 detects the leading edge and trailing edge of the document G passing through the sixth sheet path. Here, the drive system of the ADF 7 will be explained with reference to FIGS. 3 and 4.

First, FIG. 3 is an upper limit view showing the belt conveyance drive system of the full-surface belt 41, feed rollers 49a, 49b, and large reversing roller 50.

ADF7 has a full-surface belt 41 and a feed roller 4.
9a and a belt drive motor 61 that drives the large reversing roller 50.
A motor gear 62 is fixed to the main shaft of the
Further, the motor gear 62 meshes with a first gear 63a of a three-stage gear 63. Since the three-stage gear 63 is fixed to a belt drive shaft 65 that supports the drive roller 40a of the full-face belt 41, the full-face belt 41 is rotated by the rotation of the belt drive motor 61. The third gear 63 also includes a pulley 63b and a second gear 63c.
The second gear 63c meshes with an idle gear 67 rotatably mounted on the fixed shaft 66, and the idle gear 67 meshes with a feed roller gear 70 mounted on the feed roller drive shaft 69.
Further, the feed roller gear 70 has a built-in one-way clutch 71, and the one-way clutch 71 is connected to the belt drive motor 61 as shown in the arrow.
When rotating in the CW direction, the feed roller drive shaft 6
9, and is attached so that it rotates idly with the feed roller drive shaft 69 when the belt drive motor 61 rotates in the direction of the arrow CCW.
That is, only when the belt drive motor 61 rotates in the direction of the arrow CW, the drive side feed roller 49
a rotates in the direction of the arrow.

Further, the pulley 63b of the third gear 63 and the reversing pulley gear 7 disposed near the large reversing roller 50
A timing belt 73 is stretched between the second pulley 72a and the second pulley 72a. In addition, the reversing large roller 5
A large roller gear 76 is disposed on the large reversing roller shaft 75 that supports 0, and the large roller gear 76 and the first gear 72 of the reversing pulley gear 72
b are engaged. A one-way clutch 77 is built into the large roller gear 76, and the large roller gear 76 is supported by the reversing large roller shaft 75 via the one-way clutch 77. The one-way clutch 77 locks with the large reversing roller shaft 75 when the belt drive motor 61 rotates in the direction of the arrow CW, and idles with the large reversing roller shaft 75 when the belt drive motor 61 rotates in the direction of the arrow CCW. installed on. Further, the second gear 72c of the reversing pulley gear 72 meshes with an idle gear 80 rotatably mounted on the fixed shaft 79, and the idle gear 80 further meshes with an inner large roller gear 81. As a result, the large roller gear 76 and the inner large roller gear 81 always rotate in opposite directions.

Further, a one-way clutch 82 is built into the large inner roller gear 81, and the large inner roller gear 81 is attached to the large reversing roller shaft 75 via the one-way clutch 82, so that the belt drive motor 61 moves in the direction of the arrow CW. When rotated, it idles with the large reversing roller shaft 75, and when the belt drive motor 61 rotates in the direction of the arrow CCW, it locks with the large reversing roller shaft 75.

That is, the large reversing roller 50 rotates in the direction of the arrow when the belt drive motor 61 rotates in the direction of the arrow CW, and the large reversing roller 50 rotates in the direction of the arrow CW.
Rotating in the CCW direction also rotates in the direction of the arrow.

Next, FIG. 4 is a top view showing the separation drive system.

A separation drive motor 85 that drives the separation parts 45, 47, etc. is disposed in the ADF 7, and a separation motor gear 87 is fixed to a main shaft 86 of the separation drive motor 85.
is engaged with a half-moon roller gear 90 fixed to a half-moon roller shaft 89 supported by the half-moon paper feed roller 43. A half-moon pulley 91 is fixed to the other end of the half-moon roller shaft 89, and a timing belt 93 is stretched between the pulley 91 and a conveying roller gear pulley 92. The conveyance roller gear pulley 92 is attached to a conveyance roller shaft 95 to which the separation section conveyance roller 45 is fixed. The gear portion 92b of the conveyance roller gear pulley 92 meshes with an idle gear 97 rotatably mounted on the fixed shaft 96, and the idle gear 97 is connected to the drive side separation shaft 9.
It meshes with a separation gear 100 fixedly attached to 9. As a result, the rotation of the separation drive motor 85 rotates the half-moon paper feed roller 43, the separation section conveyance roller 45, and the separation belt 47 in the direction of the arrow shown in FIG.

Furthermore, a pulley 1 is attached to the other end of the conveyance roller shaft 95.
01 is fixed, and the feed roller pulley 10 is provided on the feed roller drive shaft 69 that supports the pulley 101 and the drive side feed roller 49a.
A belt 105 is stretched between 3 and 3.
Further, an electromagnetic clutch 106 is disposed between the feed roller drive shaft 69 and the feed roller pulley 103.

On the other hand, a one-way clutch 107 is built into the conveyance roller gear pulley 92, and the one-way clutch 107 is activated when the conveyance roller gear pulley 92 rotates with the separating section conveyance roller 45 in the direction of the arrow shown in FIG. It is designed to lock with the conveyance roller shaft 95. That is, when the conveyance roller shaft 95 is rotated in the direction of the arrow shown in FIG. 1, the shaft 95 and the conveyance roller gear pulley 92 rotate idly.

When the belt drive motor 61 rotates in the CW direction, the feed roller drive shaft 69 rotates in the direction of the arrow. When the electromagnetic clutch 106 is turned on, the rotation of the feed roller drive shaft 69 is transmitted to the pulley 101 via the feed roller pulley 103 and belt 105, and the separating section conveyance roller 45 rotates in the direction of the arrow. At this time, the conveyance roller shaft 95 is not driven by the separation motor 85, or the conveyance roller shaft 95 is not driven by the belt drive motor 61.
If the drive is slower than the drive to 5, the conveyor roller shaft 95
and the conveyance roller gear pulley 92 idle, and the rotation of the separation section conveyance roller 45 is entirely controlled by the belt drive motor 61. Here, if a pulley ratio is determined using the pulley 101 and the feed roller pulley 103 so that the outer circumferential speed of the driving side feed roller 49a and the outer circumferential speed of the separating section conveyance roller 45 are the same, the Feed roller 4 while holding the loop of document G
It becomes possible to send out the original G to the downstream side from 9a and 49b.

Furthermore, when the belt drive motor 61 is stopped, the separation drive motor 85 is rotated and the electromagnetic clutch 106 is turned on.
And the driving side feed roller 49a rotates in the direction of the arrow. At this time, the one-way clutch 71 in the feed roller gear 70 causes the feed roller drive shaft 69 to
Since the rotation is in an idling state, the separation drive system can rotate the drive-side feed roller 49a without affecting the belt conveyance drive system at all.
As a result, the document G in the first sheet path is moved by the separation drive motor 85 to the feed rollers 49a,
It becomes possible to send out to the downstream side from 49b.

Further, as described above, the separation unit conveyance roller 45, half-moon paper feed roller 43, and separation belt 47 of the separation supply unit are connected to the separation drive motor 85 and are driven to rotate in the direction of the arrow shown in FIG. Ru.

On the other hand, the drive-side feed roller 49a, the drive roller 40a having the full-surface belt 41, and the large reversing roller 50 are driven by a belt drive motor 61. The belt drive motor 61 can rotate in both forward and reverse directions. For example, when the motor 61 rotates in the CW direction, each of the rollers 49a, 40
a, 50 are all rotated forward in the direction of the arrow shown by the solid line in FIG.
0 rotates in the direction of the dashed arrow (drive roller 4
0a is reverse rotation), and the driving side feed roller 49a is configured not to rotate.

Further, an electromagnetic brake 109, a clock disk 110, and a belt clock interrupter 111 are connected to the output shaft of the belt drive motor 61, and as the belt drive motor 61 rotates, a pulse signal is generated from the belt clock interrupter 111. Ru.

Further, as shown in FIG. 1, the upstream discharge roller 53a on the drive side and the downstream discharge roller 55a on the drive side are connected to the paper discharge drive motor 112, and are rotated and driven in the direction of the arrow. Further, a clock disk 113 and a paper discharge clock interrupter 115 are connected to the output shaft of the paper discharge drive motor 112, and as the motor 112 rotates, a pulse signal is generated from the paper discharge clock interrupter 115.

C. The key group and display group will be explained.

In FIG. 5, 201 is a copy start key, which is pressed to start copying.

Reference numeral 202 is a key designated when performing single-sided copying from a double-sided original. When this key is designated, the ADF 7 operates in a double-sided mode, which will be described later.

203 is an LCD (liquid crystal) type message display, for example 5 x 7 dots.
Can display a 40-character message.

A copy number display 204 displays the number of copies or a self-diagnosis code.

D The control device 300 of the device main body 1 will be explained.

In FIG. 6, 301 is a central processing unit (CPU) that performs arithmetic control to execute the present invention.
It is. 302 is a read-only memory (ROM) in which device control procedures (control programs) are stored in advance, and the CPU 301 uses this ROM.
Each component device connected via the bus is controlled according to the control procedure stored in 302. 303
is a random access memory (RAM) which is a main storage device used for storing input data and as a working storage area.

305 is the load of main motor 19 and CPU3
01 is an interface (I/O) that outputs control signals, 306 is an interface that inputs input signals from the image tip sensor 16, etc. and sends them to the CPU 301, and 307 is an interface that controls input and output of the key group and display group. be.

The display group is each display shown in FIG. 5, and uses LEDs and LCDs. The key group is each key shown in FIG. 5, and the CPU 301 can determine which key has been pressed using a well-known key matrix.

E The control device 400 of the ADF 7 will be explained.

What is indicated by the reference numeral 400 in FIG.
This is a block diagram showing a control circuit for operating the present invention, and is mainly composed of a well-known one-chip microcomputer (hereinafter referred to as CPU) 401, which has built-in ROM, RAM, etc.
Further, it performs arithmetic control regarding the ADF 7 while exchanging signals with the control device 300 of the copying machine main body 1.

Input ports I ₁ to _{I 3} of the CPU 401 receive signals from a document detection sensor S1, a paper feed sensor S2, and a paper discharge sensor, respectively. Also, CPU40
A signal from the paper ejection clock interrupter 115 is input to the interrupt terminals int1 and int2, and as will be described later, this serves as a reference clock for the amount of movement of the document G, and a counter inside the CPU 401 performs a counting operation. Let's do it. On the other hand, CPU
The output ports O ₁ to O ₅ , O ₈ of 401 receive the operation signal of the aforementioned separation drive motor 85, the CW and CCW signals for operating the belt drive motor 61 in forward and reverse directions,
Operation signals for the electromagnetic brake 109, paper ejection drive motor 112, and electromagnetic clutch 106 are output,
Each output load is controlled via drivers _D1 to _D5 and _D8 , respectively. In addition, the control device 3 of the copying machine main body 1
Signals are exchanged with the CPU 401 via a cable 402, and input ports I ₄ to I ₆ of the CPU 401 receive a document feed signal, document discharge signal, and mode signal, respectively, and output ports O ₆ to O ₇ input the document feed signal, document discharge signal, and mode signal. Driver D ₆ ,
A COPY request signal and an original detection signal are output via _D7 . Each signal will be described later. Reading of these input signals or turning on/off the load is determined by a program stored in the ROM within the CPU 401.

Next, the operation explanatory diagrams in FIGS. 7 and 8 and the
The operation of this embodiment will be explained along the flowcharts shown in FIGS.

In FIG. 9, a stack of originals is set on the original loading tray 42 of the ADF 7 (S9-1), one-sided mode is set to two-sided mode using the keys on the operation panel (S9-1), and the copy start key 201 is pressed. When pressed (S9-3), processing starts.
When the single-sided mode is set in S9-4, first turn on the document feed signal (S9-5) to enable the ADF described later.
7 single-sided mode processing (S9-6), and document G
is stopped at exposure position X on platen glass 2.
Then, the COPY request signal is turned on from the ADF 7 (S9-7), the document feed signal is turned off (S9-8), and the main body 1 of the copying machine turns on the illumination lamp 9 (S9-9). , turn on the optical motor 12 and start scanning (S9-10). Then, at the end of the scan (S9-11), step S9
Return to step -4 and repeat steps S9-4 to S9-11 to read the image. Also, step S9−
When duplex mode is set in step 4, by turning on the document feed signal as in single-sided mode (S9-12), the ADF 7 performs duplex mode processing (S9-13), which will be described later. From 7 onwards, image reading is performed using the same steps as in the single-sided mode.

Below, cases in which ADF single-sided mode and ADF double-sided mode are specified will be explained respectively.

[When copying four originals in one-sided mode] The one-sided mode program (Fig. 10) proceeds to step S10-1 where separation processing is performed, and as shown in Fig. 12, the lowest original page 4 of the original stack is copied. The separation drive motor 85 is turned on to separate only one sheet (S12-1), the document G advances in the first sheet path, and after the paper feed sensor S2 detects the leading edge of the document (S12-3), After completion (S12-4), the separation drive motor 85 is turned off (S12-5), and the document G hits the nip portion of the feed rollers 49a, 49b with its tip, and a predetermined amount of loop is formed. Stop. Furthermore, a timer for stabilizing the loop is started (S12-6), and after that, the separation process is ended (S12-7). This has the effect of correcting the skew even if the document G skews when it is separated.

On the other hand, the ADF 7 is provided with a program constituting the control means Y.
The separation drive motor 85 and the electromagnetic clutch 106 are controlled so that the platen glass 2 is transported to a position close to the upstream side of the platen glass 2 during the previous document reading operation.

That is, when the leading edge of the document G is brought into contact with the nip portion of the feed rollers 49a and 49b and the separation process is completed as described above, the process proceeds to step S18 in which a pre-feeding process is performed, and as shown in FIG. The electromagnetic clutch 106 is turned on (S18-1), the separation motor 85 is turned on (18-2), and the separation parts 45, 4 are turned on.
7, the driving of the feed rollers 49a and 49b is started. Further, at the same time, a belt counter (BCO) is started (S18-3), and the belt counter (BCO) is waited for to end (S18-4). Here, the belt counter (BCO) is the feed roller 4.
The distance is set to a value corresponding to the distance from the position of the center line of 9a, 40b to the end surface of platen glass 2. When the belt counter (BCO) ends,
By turning off the separation drive motor 85 (S18-5) and further turning off the electromagnetic clutch 106 (S18-6), the leading edge of the unexposed original G reaches the end surface of the platen glass 2, and the exposed original G This means that the data is sent just before .

Next, the process advances to step S10-2 where paper feeding processing is performed.
As shown in FIG. 13, feed rollers 49a, 49
At the same time as the belt drive motor 61 is turned on in normal rotation (S13-1), the belt clock interrupter 111 drives the belt 41 and the full-surface belt 41 to convey the document G from the first sheet path to the second sheet path. Starts the size check counter that counts according to the clock input (S13-
2) Start measuring the document size. Then, at the same time that the document G is conveyed and the trailing edge passes through the paper feed sensor S2 (S13-3), the size check counter is stopped (S13-4), and based on the data, the size check shown in FIG. 17 is performed. At SUB, the document size is determined and at the same time, a registration counter RGCN is started to stop the document G at the exposure position X on the platen glass 2 (S13-6), and the belt is driven until the registration counter RGCN ends. The speed of the motor 61 is lowered and stopped instantly by the electromagnetic brake 109, and the speed of the belt drive motor 61 is controlled to obtain an accurate stop without variation (S13-7), and when the registration counter finishes (S13 -8) At the same time, the belt drive motor 61 is turned off (S13-9) and the electromagnetic brake 109 is turned on (S13-10) to accurately stop the document G at the exposure position X on the platen glass 2 (Seventh (see figure a). Here, in the size check SUB, as shown in FIG. 17, as a method of determining the document size, the feed rollers 49a, 49b
The true original size is calculated by adding the distance from the nip position to the paper feed sensor S2 (S17-1). At this time, the document G is transferred to the feed roller 49
a, 49b and the full-surface belt 41, and the amount of feed and the count value input to the belt clock interrupter 111 reliably match. Based on the corrected size data, B5, A4,
The size of A4R, B4, A4R, B4, A3, etc. is determined (S17-2, S17-3).

Next, proceed to step S10-3 (Figure 10),
By outputting the COPY request signal to the main unit 1 of the apparatus, the copying machine temporarily turns off the document feed signal, and the optical system operates to copy the document page 4, which is set at the exposure position X on the platen glass 2 with the image surface facing downward. The exposure copying process is carried out for. The image G of the original page 4 is formed on the first side of the transfer paper P, and the transfer paper P is discharged to the paper discharge tray 37 with the image surface facing upward.

While the apparatus main body 1 is in the exposure process, the sequence proceeds to step S10-4, and it is determined whether all document feeding has been completed based on whether the document detection sensor S1 is off. Since it is still page 4 at this point, the document detection sensor S1 is on, and next, it is checked whether the mode signal from the main body 1 of the apparatus is set to continuous feeding (S10-5), and then the document size determination described above is performed. Depending on whether the document size of page 4 is A4R or larger (S10-6), the flow of the subsequent program is changed. Here, the explanation will be continued assuming that the mode signal is a continuous transmission designation.

If the size of document page 4 is smaller than A4R, the above-mentioned separation process (S10-1) and pre-feeding process (S18) are executed before the exposure process for page 4 document G is completed, and the next page 3 document is G is sent to the end face of the platen glass 2 and then stopped. Next, the process proceeds to step S10-7, where the document feed signal is turned on when the exposure process of document page 4 in the main body 1 of the apparatus is completed, and as a result, the COPY
Turn off the request signal and start the next operation.

In step 10-8, start paper ejection processing 1,
Returning to step S10-2, the paper feeding process for document page 3 begins.

Here, the paper ejection process 1 started in the previous step will be explained using FIG. The situation at the time when the paper ejection process 1 is activated is as shown in FIG. 7a. Here, page 4 waits for sensor S3 to detect the leading edge of page 4 (S15-1).
However, at this time, the entire surface belt 41 is not driven during the paper ejection process 1. So, step
Returning to S10-2, the next document page 3 is fed, and then steps S10-3 to S10 in FIG.
When steps up to −7 are executed, the relationship of document G is shown in Figure 7b.
become that way. Furthermore, the document on page 3 is also subjected to paper ejection processing 1.
(S10-8). Further, during the paper feeding process for the document on page 2, the paper feed sensor S3 detects the leading edge of the document on page 4 as shown in FIG.
A belt counter corresponding to the distance to the nip 5b is activated, and the belt counter is waited for to complete (S15-2).

When the belt counter ends, the paper discharge drive motor 112 is turned on and the document G of page 4 starts to be pulled out, and the process waits for the paper discharge sensor S3 to detect the trailing edge of the document G (S15-3). After this, as shown in FIG. 7b, the document feeding process for page 2 (S10-
Even if 2) is completed and the full-surface belt 41 is stopped, the document G of page 4 is not delivered to the downstream discharge rollers 55a, 5.
5b continues to be ejected in the direction of the arrow, and at the same time as the paper ejection sensor S3 detects the trailing edge of the original G on page 4, the microcomputer is 90
1, and while controlling the speed of the paper ejection drive motor 112 to improve consistency when ejecting the original G until the paper ejection counter ends, Wait for the paper ejection counter to finish, and when it finishes,
The paper discharge drive motor 112 is turned off, the document G is discharged onto the document discharge tray 52, and the paper discharge process is completed (S15-4).

At this time, the feed amount by the paper ejection counter and the feed amount by the downstream ejection rollers 55a and 55b reliably match. After that, the document detection sensor S1 detects the document G.
The above sequence is repeated while detecting.

In addition, in this embodiment, the document detection sensor S1 no longer detects the document G. After the paper feeding process for page 1 is completed and step S10-4 is executed, the document detection sensor S1 is turned off. and step
Proceed to S10-9, turn off the document detection signal, and set the document discharge signal from the main body 1 of the device.
The COPY request signal is turned off and paper ejection processing 2 is started (S10-10).

At this point, the state of the original G is as shown in FIG. is turned on for normal rotation (S16-1).

At this time, the corrected paper ejection process 2 is being executed on the originals G of pages 2 and 3 at the same time.

When the paper ejection sensor S3 detects the leading edge of the document G on page 4, it starts the belt counter BC1 in the same manner as in the paper ejection process 1 described above, and when BC1 is completed, the paper ejection drive motor 112 is turned on (S16-2). ,
Further, the belt counter BC2 is started, which determines the timing to permit the start of separation processing for the next document G. In this embodiment, the counter BC2 is set to the position where the trailing edge of the document is separated from the position of the turn roller 40b (S16-2). That is, the seventh
As shown in FIG. f, the counter value is set to {(length of document)-l}. Here, when the belt counter BC2 ends, the belt drive motor 61 is turned off and a separation start permission flag is set (S16-4). Here, since there is no document to be separated next, the actual operation is not affected. The influence of this flag will be discussed later.

After that, the sequence for aligning the ejected originals is executed and the process ends in the same way as ejecting process 1 (S16-
5).

Further, in step S10-5 of the sequence, if the mode signal cannot be assigned associatively, or if the document size is A4R or more, the continuous feeding mode is stopped and the document is transferred to the downstream discharge rollers 55a, 55b.
In order to change the sequence so that it can be reliably pulled out by OFF, and the above-mentioned paper ejection process 2 is activated (S10-12).
Thereafter, as shown in FIG. 7f, in step S16-4 during the paper ejecting process 2 for the document on page 4, when it is detected that the separation start flag is set, the flag is reset at the same time. The separation process for the original G, that is, the original G for page 3 is started (S10-13). Thereafter, as described above, the process is repeated until all the documents G are removed from the document stacking tray 42.

[When copying two sides of an original in duplex mode] The duplex mode program (Fig. 11) performs the above-described separation process (pages 3 and 4) of the lowest originals (pages 3 and 4) on the original stacking tray 42 at the same time as in the single-sided mode. S10
-1), performs a paper feeding process (S10-2), then proceeds to step S11-3 to perform a reversal process shown in FIG. 14 in order to copy page 4, drives the full-surface belt 41, The belt drive motor 61 is turned on in reverse to transport the document from the third sheet path to the fourth sheet path (S14-1), and the document is held between the large reversing roller 50 and the reversing roller 51, and the document is transferred to the fifth sheet path.
After the paper feed sensor S2 detects the light edge of the document (S14-2), the reversal loop counter is started (S14-3), and after the completion (S14-4)
By turning off the belt drive motor 61 (S14-
5) As in the separation process, the document forms a loop for correcting the skew of the document and waits (see FIG. 8b).

Next, as in single-sided mode, paper feeding processing (S11-
4), turn on the copy request signal (S11-5),
When the document feed signal from the main body 1 is set (S11-6), the copy request signal is turned off (S11-6).
7).

Next, in order to copy page 3, the above-mentioned inversion process (S11-8) is performed, and then the paper feeding process (S11-9) is performed.
and turn on the copy request signal (S11-10).
At this time, the state of the document detection sensor S1 is determined (S11-11}, and if the next document G has been detected, the process advances to step S11-12, receives the document feed signal from the main body 1 of the apparatus, and performs copying. The request signal is turned off and the above-mentioned paper discharge process 2 is started (S11-13).Furthermore, in step S11-14, the discharged document reaches the above-mentioned predetermined position (Fig. 8e) and the separation start flag is set. After being set, the separation start flag is reset and the process returns to step S11-1 to start processing the next document G. Thereafter, the process continues until the document G runs out from the document stacking tray 42, that is, in step S11-11. The above sequence is repeated until the detection sensor S1 no longer detects the document G, and the document detection sensor S1
If the document G is not detected, step S11
Proceed to -15, turn off the document detection signal, wait for the document ejection signal to be set from the apparatus main body 1, turn off the COPY request signal, start the above-mentioned paper ejection process 2, and end (S11-16) .

In this way, the above-mentioned operations are performed one after another for the originals G loaded on the original stacking tray 42, so that the same page as the original G set on the original stacking tray 42 is placed on the output tray 37 of the copying machine M. A single-sided copy or a double-sided copy of the sequence is obtained.

(g) Effects of the Invention As described above, according to the present invention, the skew of the original can be corrected by controlling the stop and rotation of the first conveyance rotation means. Furthermore, since the trailing document is temporarily stopped at a position close to the preliminary feeding position, the amount of feeding to the preliminary feeding position can be easily controlled. Furthermore, by rotating the first conveyance rotation means, preliminary feeding of the following document can be performed while the second conveyance rotation means is stopped. Therefore, the time required to feed the original can be shortened regardless of the size of the original. As a result, the time required to replace the original can be shortened and the image reading efficiency of an image reading device such as a copying machine can be improved without increasing the transport speed of the original or changing the normal scanning method. Furthermore, the first conveyance rotation means can be rotated in accordance with the ejection of the preceding document by the rotation of the second conveyance rotation means, so that the trailing document can be sent to the second conveyance rotation means. Therefore, documents can be carried in and out smoothly, and replacement can be carried out smoothly. Further, the first motor means mainly controls the rotation of the feeding rotation means, and the second motor means mainly controls the rotation of the second conveyance rotation means, and both motor means can be selectively operated. By driving the first conveyance rotation means and the second conveyance rotation means by appropriately driving each transmission means, the first conveyance rotation means and the second conveyance rotation means can be smoothly operated. Therefore, the skew of the original can be corrected, and the subsequent original can be preliminarily fed. Furthermore, since the trailing original before scanning is not on the platen, there is no deterioration in stopping accuracy due to repeated conveyance and stopping on the platen, and furthermore, the adjustment of the paper spacing of the original is restricted to the original reading work. Never.

[Brief explanation of the drawing]

FIG. 1 is a side view of a document conveyance device according to an embodiment of the present invention, FIG. 2 is a side view of a copying machine in which the document conveyance device is arranged, and FIG. 3 is a top view showing a belt conveyance drive system. FIG. 4 is a top view showing the separation drive system, FIG. 5 is a plan view of the operating section, FIG. 6 is a block diagram showing the circuitry of the copying machine main body and the control device of the document transport device, and FIGS. 7 and 8. The figures are explanatory views of the operation according to the embodiment of the present invention, with FIG. 7 showing the operation in the single-sided mode and FIG. 8 showing the operation in the double-sided mode. Further, FIGS. 9 to 18 are flowcharts showing operations according to an embodiment of the present invention. 2...Platen glass, 2a...Inlet to the platen glass, 7...Document conveyance device, 41...Second conveyance rotation means (full-surface belt), 45...Feed rotation means (separation unit conveyance roller) , 47... Separation belt, 49a... First conveyance rotation means (feed roller), 61... Second motor means (belt drive motor), 63... Third transmission means (three-stage gear), 7
1...Fourth transmission means (one-way clutch),
85...first motor means (separated drive motor),
106...Second transmission means (electromagnetic clutch), 1
07...first transmission means (one-way clutch),
G...Original, X...Reading position (exposure position),
Y...control means.

Claims (1)

[Scope of Claims] 1. A document placing table, a feeding rotation means for separating and feeding the documents on the document placing table one by one, and a first document disposed on the downstream side of the feeding rotation means. a second conveyance rotation means, which is disposed downstream of the first conveyance rotation means, and which guides the document conveyed by the first conveyance rotation means to a predetermined reading position on the platen of the image forming apparatus. A document transport device comprising: a transport rotation means; first and second motor means; a first transmission means for transmitting rotation of the first motor means to the feed rotation means; a second transmission means for selectively transmitting the rotation of the motor means to the first conveyance rotation means; a third transmission means for transmitting the rotation of the second motor means to the second conveyance rotation means; a fourth transmission means that transmits the rotation of the second motor means to the first conveyance rotation means, but not the rotation of the first conveyance rotation means; When the feeding rotation means rotates, the second transmission means is temporarily cut off so that the leading edge of the document is restrained by the stopped first conveyance rotation means. When the document is set at a predetermined reading position, the first motor means is rotated so that the leading edge of the trailing document comes just before the second conveyance rotation means by the rotation of the first conveyance rotation means. the first document so as to rotate the second motor means to guide the trailing document to a predetermined reading position on the platen by rotating the first and second conveying rotation means; , a control means for controlling the second motor means. 2. A reversing path for reversing the discharged document by reversing the second transporting and rotating means and guiding it again to the second transporting and rotating means;
The document conveying apparatus according to claim 1, further comprising: a control means for prohibiting preliminary feeding of the document by the conveyance rotation means. 3. The second conveying and rotating means is an endless belt that conveys the original along the platen, and furthermore, in a mode in which an original longer than a certain length determined by the length of the belt is used, the first
The document conveying apparatus according to claim 1, further comprising a control means for prohibiting preliminary feeding of the document by the conveyance rotation means.