JPH01288546A - Original transporting device - Google Patents

Abstract

PURPOSE:To reduce the loss of the original replacement time to the min. independently of the length of an original by transporting the next original until the top edge comes to the position close to the upstream side of a platen glass during the reading out operation for the original at an original reading-out position. CONSTITUTION:The originals G which are transported one by one in succession by separating means 45 and 47 are sent onto a plate glass 2 by the transport means 49a and 49b, and the rear edge is positioned so as to be set at the carrying-in port 2a of the platen glass, and said original is read by a reading-out device X. While, the next original G is transported until the top edge is detected by a sensor S2 at the position in close to the upstream side of the platen glass 2, by the transport means 49a and 49b controlled by a control means Y, and put into waiting. Independently of the length of the original, said original is transported to the reading-out position X, succeeding to the preceding original G discharged into a tray 52 from the reading position X in a certain paper intervals. Thus, the loss of the replacement time for the originals can be reduced to the min.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention 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.

(0) 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 feeding device handles documents regardless of their size.
The procedure involves transporting and stopping one document at a time to the image reading position of the platen crow, and after reading the image, ejecting the scanned original from the platen crow, and transporting and stopping the next original to the image reading position to read the image. It was starting to repeat.

However, this method has the drawback that as the size of the originals becomes smaller, the gap between the originals (paper gap) increases, resulting in a loss of conveyance time and lowering efficiency. In addition, if the document transport speed is increased unnecessarily, it may cause noise and transport bells.
This has disadvantages such as increased wear and the like, and increased damage to the document in the event of poor conveyance.

Recently, there have been proposals for document feeding methods for copying machines to eliminate such inconveniences (for example, Japanese Patent Application Laid-open No.
-140364, JP-A-61-32836).

The method described in Japanese Patent Application Laid-open No. 60-14.0364 is that when continuously copying originals of a size smaller than the copyable size, the method is set at a downstream position in the original transport direction of the platen glass surface of the copying machine. The first document placed on the document tray is conveyed to the copying position where it is located, and the second document is conveyed onto the platen crow surface adjacent to the copying position. The scanner was transported to the standby position set upstream of the printer, stopped against the printer header, and finished the exposure. Then move the second original in the standby position to the copying position, and
The third document placed on the tray is conveyed to a standby position, and the procedure of stopping is repeated.

Also, JP-A-61. The method described in Publication No. 32836 detects a distance slightly longer than the length in the conveyance direction of each document to be conveyed sequentially, and sets the conveyance cycle time required to run this FF12 separation conveyance belt. ,
After the first document in the document tray is stopped being conveyed to a preset copy position downstream in the document conveyance direction on the platen crow, the second document is placed on the platen adjacent to the copy position. It was transported and stopped at an appropriate interval at a standby position set upstream of the crow, and the exposure was completed. The conveyor bell 1 is run for the respective conveyance cycle times as described above, and the second document at the -1-1 writing machine position is conveyed to the copying position, and the third document is conveyed to the standby position and stopped. The procedure is repeated.

(c) Problems to be Solved by the Invention By the way, in the method described in Japanese Patent Application Laid-open No. 60-140364, the size is half of the maximum size A3 because it is stopped in the standby position by a mechanical stopper. A4
It is efficient when transporting documents such as B5 or postcards, but the disadvantage is that, for example, for B5 or postcard documents, it can only wait at a predetermined position with a stopper, so the gap between documents becomes wider than necessary, reducing efficiency. Also, since the copying position on the platen glass is on the opposite side of the document tray, the time it takes to transport one original to the copying position is longer than the maximum transport time, even if the original is A4, which is half the maximum size of A3. It has the drawback of being time consuming and not necessarily the best in terms of efficiency.

Furthermore, the method described in Japanese Patent Application Laid-Open No. 61-32836 includes positioning means for stopping the original at each position.
Since the stop position control of the conveyor belt is used instead of a mechanical stopper, the distance between sheets can be kept constant regardless of the size of the document, thereby eliminating the drawback of reduced efficiency due to size. However, with this method, the procedure of moving the second and subsequent documents for a predetermined transport cycle time until they reach the copying position and stopping them at the standby position must be performed at least once. The more times the conveyance and stopping are repeated (the more the conveyor belt stops, the greater the risk that the belt and the original will be misaligned, no matter how smoothly the conveyor belt's stop position can be controlled), and when the belt finally reaches the copying position. There is a risk that the document may deviate from a predetermined position, causing a decrease in stopping accuracy, which is an important function of the document conveying device.

Furthermore, although this method eliminates the drawback of decreased 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 1~lay section, the second document is fed from 1~ray, but the speed of the iron feeding roller is If the speed is increased unnecessarily, there is a problem that skewed document feeding or misfeeds may occur, and it is difficult to match the speed of the conveyor belt, so it is necessary to make the speed slower than that speed. 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, in this method, since the document is placed at the same downstream position on the platen crow as the document before exposure or the document being exposed, it is only possible to shorten the distance between the documents once the exposure operation has started. 4-1 The distance between documents must be adjusted before conveyance to the position, leading to loss of time and difficulty in control. Furthermore, in order to shorten the space,
The arrangement of each drive unit becomes complicated, and furthermore, there is a possibility that the conveyance path of the document becomes complicated, which may lead to serious problems such as damage to the document.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a configuration in which a document is placed on standby in proximity to a platen crow having a document reading position in the flow section, 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. For example, referring to FIG. Convey the document to the reading position Fj (X),
In the document transport device (7) which discharges the document (G) from the reading position N(X), the document reading position (X) or the trailing edge of the read document (G) is located at the platen glass ( 2) is provided near the entrance (2a) for transporting the document (G) toward the platen crow, and the transport means (49a, 49b) ), the original reading position (X)
It is characterized by comprising a control means (Y) for driving the next document (G) to be conveyed until the leading edge of the document (G) is at a position close to the upstream side of the platen crow (2) during the document reading operation. That is.

In addition, in order to transport the skew-corrected original to the original reading position (X) of the platen crow (2), the transport means (
49a, 49b) may be provided with a conveying roller "C" which conveys the document (G) separated after forming a loop in the document (G) separated by the separating means (45, 47).

(E) Function Based on the above-mentioned configuration, the original (G) is transferred to the transport means (49a, 4
9b) toward the platen glass (2). Then, the document (G) is located at a document reading position (X) in which the downstream end is near the entrance (2a) of the platen glass, that is, the most upstream side of the platen glass (2) is the Baum position. is transported to the location (
X).

On the other hand, the leading edge of the next original (G) is moved by the conveyance means (49a, 49b) controlled by the control means (Y) during the reading operation of the previous original (G) at the original reading position (X). The document (G) is conveyed until it is located close to the upstream side of the platen glass (2) and waits, and then is ejected from the reading position (X) at a constant distance regardless of the size of the document (G).
Subsequently, it is transported to the reading position (X, ).

Further, if the conveying means (49a, 49b) is a conveying roller that conveys the document (G) after forming a loop therein, the document (G) may be conveyed after forming a loop.
G) is corrected for skew and conveyed toward the platen glass (2).

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 has an image reading section 3 consisting of a platen glass 2 etc. on the upper part of the apparatus main body 1, and an image recording section consisting of a photosensitive drum 5 etc. below the image reading section 3. It is equipped with 6.

Furthermore, an automatic document feeder 7 is arranged above the image reading section 3 .

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

In the image reading section 3, reference numeral 2 indicates the platen crow on which the original is placed, reference numeral 9 indicates an illumination lamp for illuminating the original, and 10a, 1
0b, 10c, 1. 11 is a lens having a focusing and variable magnification function, 12 is an optical system motor that drives the optical system, 13, 15, and 16 are a scanning mirror that changes the optical path of the reflected light of the original, respectively. Each sensor is a sensor. Also, 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 pressure unit, 21 is a blank exposure unit, 22 is a developing device, 23
25 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. Further, 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 ejection roller,
37 is a paper discharge tray, and 39 is a sensor used for double-sided recording.

The surface of the photosensitive drum 5 is made of a seamless photoconductor using a photoconductor and a conductor, and the drum 5 is rotatably supported and activated in response to pressing a copy start key, which will be described later. The main motor 19 starts rotating in the direction of the arrow. Next, when the predetermined rotational control and potential control processing (preprocessing) of the photosensitive drum 5 are completed, the document G placed at the exposure position The light reflected from the original G is illuminated by the lamp 9, and the light reflected from the original G is sent to the first scanning mirror 10a and the second scanning mirror 10a.
Scanning mirror 10b, third scanning mirror 10C, lens 1
The image is formed on the photosensitive drum 5 via the first and fourth scanning mirrors 10d.

The photosensitive drum 5 is corona charged by the high voltage unit 20. Thereafter, the image (original image) illuminated by the illumination lamp 9 is exposed to slit light, and an electrostatic latent image is formed on the tram 5.

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

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

Further, the photosensitive drum 5 after the transfer continues to rotate, and its surface is cleaned by the cleaning device W26.

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

The AD lower 7 is connected to the device main body 1, as shown in detail in FIG.
It has a full-surface belt 41 disposed to face the platen glass 2, and above the full-surface belt 41 is a document loading tray 42 on which a large number of documents G can be stacked and set. The full-surface belt 41 is an endless belt with a width that can cover the entire surface of the sheet document on the platen crow 2, and is supported by a drive roller 51a and a turn roller 51b, and is attached to the drive roller 51 to prevent slippage. Structure
As the surface of the document is being pierced, frictional force is applied to the surface of the document.

It has a sufficient coefficient of friction so that it can be transported by sliding on Latin 2. Further, the document stacking tray 42 is arranged at an angle so as to be lower on the downstream side in the document feeding direction, and the documents G stacked on the document stacking tray 42ζ are stacked together on the downstream side.

A semicircular paper feed roller 43 is located downstream of the document stacking tray 42.
It is arranged so that it rotates in the direction of the arrow to feed the original G on the original loading tray 42 downstream, and when the original G is not fed out), it stops facing upward at the chord part. controlled to do so. Further, a separation section conveyance roller 45 is disposed downstream of the half-moon-shaped paper feed roller 43, and a separation heald wound around a drive roller 46a and a driven roller 46b faces the separation section conveyance roller 45. 47 are arranged, and these separation unit transport rollers 45 and separation belts 47 constitute a separation unit. The sheets are separated and transported one by one from the lowest one by a transport roller 45 and a separation belt 47 that rotates in the document return direction.Furthermore, on the downstream side of the separation section 45, there is a drive roller 49a. A feed roller consisting of a driven roller 49b and a driven roller 49b is arranged.
A first sheet path (2) is constructed from the separating portions 45, 47 to the feed rollers 49a, 49b. Also, a platen glass population 42a near the drive roller 40a that supports the entire belt 41 from the feed rollers 49a and 49b.
A second sheet path (■) is constructed, and the document G sent from the separating section 45.47 passes through the first sheet path (2), is nipped by the feed rollers 49a and 49b, and is sent.
Pass through the second sheet path ■ and enter the platen crow 1] 2a
The sheet is then sent to the third sheet path (2) configured on the platen glass 2 by the full-surface belt 41 rotating in the direction of the arrow shown by the solid line, and is configured with the home position near the platen glass population 2a on the platen glass 2. The exposure position is stopped at 1x.

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. A fourth sheet path 1 to 1 is formed from the platen glass platen 2a to the joint between the large reversing roller 50 and the reversing roller 51, and a fifth sheet path V is formed around the outer periphery of the large reversing roller 50. The fifth sheet path V runs from the reversing roller 51 around the outer periphery of the large reversing roller 50 and joins the first sheet path (2) on the upstream side of the feed rollers 49a and 49b, The document G on the platen crow 2 is conveyed to the fourth sheet path ■ by the reverse rotation of the full-surface belt 41 indicated by the broken line, and is held between the large reversing roller 50 and the reversing roller 51, and is then conveyed to the fourth sheet path ■ by the reverse rotation shown by the broken line of the large reversing roller 50. The sheet is rotated in the direction of the arrow shown by and sent to the fifth sheet path V, where it is held between feed rollers 49a and 49b, passes through the second sheet path (2), and is turned over and sent onto the platen glass 2 again. It looks like this.

Furthermore, a document ejection tray 52 is arranged above the full-surface belt 41, and a sixth sheet path (2) is formed from the platen crow outlet 2b near the turn roller 40b that supports the full-surface belt 41 to the document ejection tray 52. ing. Upstream discharge rollers 53a and 53b are disposed on the upstream side of the sixth sheet path (2), and a document discharge tray 52
Downstream discharge rollers 55a, 5'5b are disposed at the downstream end facing the platen glass 2, and the document G on the platen glass 2 is transported from the platen glass outlet 2b to the third discharge roller 55a and 5'5b by a full-surface belt 41 that rotates forward in the direction of the arrow shown by the solid line. The document is sent to sheet path (2) of No. 6, and is ejected onto the document ejection tray 52 while being held between the upstream ejection rollers 53a and 53b and the downstream ejection rollers 55a and 55b, respectively.

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 has LEDs (light emitting diodes) arranged opposite to each other.
56a and a phototransistor 55b, and detects the presence or absence of a document G on the document stacking tray 42. 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 opposite to each other, and is arranged at the leading edge and the rear of the document. Detect the edge. Furthermore, 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 and trailing edges of the document G passing through the sixth sheet path (2). do. Here, the third
The drive system of the ADF 7 will be explained with reference to FIG.

Figure 3 shows the full-surface belt 41, feed rollers 49a, 4
9b and a top view of the belt conveyance drive system of the large reversing roller 50. FIG.

The ADF 7 is provided with a belt drive motor 61 that drives the entire belt 41, the feed roller 49a, and the large reversing roller 50. A motor gear 62 is fixed to the main shaft of the motor 61, and the motor gear 62 or 3 is fixed to the main shaft of the motor 61. stage gear 63
It meshes with the first gear 63a. The three-stage gear 63 supports the driving rollers 40a of 41 on the front surface of the bell 1, and displays a message of 40 characters, for example, with 5×7 dots forming one character.

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 bag that performs calculation control for carrying out the present invention! (CPU). Reference numeral 302 is a read-only memory (ROM) that roughly stores the control procedure (control program) of the device, and the CPU 30]
controls each component device connected via the bus according to the control procedure stored in this ROM 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.
It is.

305 is an interface Cl10) that outputs the CPO 301 control signal to the load of the main motor 19; 306 is an interface that inputs input signals from the tip sensor 16, etc. and sends them to the CPU 30; and 307 is an input/output controller for the key group and display group. This is an interface to

The display group is as shown in Figure 5, and the LE
D or LCD is used. The key group is each key shown in FIG. 5, and the CPU 301 can determine whether a key has been pressed using a well-known key matrix.

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

The reference numeral 400 in FIG. 6 is a block diagram showing a control circuit for operating the present invention.
It is mainly composed of a well-known one-step microcomputer (hereinafter referred to as CPU) 401, which has built-in M, RAM, etc., and also sends and receives signals to and from the control device 300 of the copying machine main body 1, and performs calculations related to the ADF 7. is under control.

Input ports 1 to 1 of the CPU 401, document detection sensor S1. Signals from the paper feed sensor S2 and the paper discharge sensor are sent to each other. Also, CI) U 401 interrupt terminal 1
A signal from the discharge clock interrupter 1]5 is inputted to ntl to 1nt2, which becomes a reference clock for the amount of movement of the document G as described later, and is counted by a counter inside the CPU 401. On the other hand, C
01-05 to output capo-1 of PU401. Oa includes the operation signal of the separation drive motor 85 described above, the cw and ccw signals that operate the belt drive motor 61 in forward and reverse directions, the electromagnetic brake 109, the paper ejection drive motor 112, and the electromagnetic clutch 106.
The operation signals of the drivers D, ~Ds, and D are output, respectively.
Each output load is controlled via a. In addition, signals are sent and received to and from the control device 300 of the copying machine main body 1 via the cable 402, and input ports (4) to (6) of the CPU 401 each receive a document feed signal, a document discharge signal, and a mode signal. Driver D6. from output boats 06-07. A C0PY request signal and a document detection signal are outputted via D7. Each signal will be described later. Reading these input signals or turning on/off the load is done by R in the CPU 401.
It is determined by the program stored in OM.

q Next, the operation of this embodiment will be explained along the operation explanatory diagrams of FIGS. 7 and 8 and the flows shown in FIGS. 91 to 18.

In FIG. 9, load the stack of originals onto the original loading tray 42 of the ADF 7 to the camera 1 (S9-1), set the single-sided mode or duplex mode using the keys on the operation panel (S9-2), and press the copy start key 201. When pressed (S9-3), processing starts. 59-4, when setting the single-sided mode, first turn on the document feed signal (S9-5).
7 is performed in single-sided mode (S9-6), and the document G is stopped at the exposure position x of the platen crow 2. Then, ADF
7, the copy request signal is turned on (S9-7), the document feed signal is turned off (89-8), the main body 1 of the copying machine turns on the illumination lamp 9 (S9-9), and the optical motor Turn on 12 and start scanning from star 1 (S9-
10). After the scanning is completed (S9-11), the process returns to step 59-4, and the steps 59-4 to S9-11 are repeated to read the image. Further, a step 89-4-way clutch 107 is built in, and the one-way clutch 107 is connected to the conveyor roller shaft 92 when rotating in the direction of the arrow shown in FIG. It is designed to lock. 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 bell 1 to the drive motor 61 rotate in the CW force direction, the feed roller drive shaft 69 rotates in the direction of the arrow. When the electromagnetic clutch 106 is turned on, the feed roller drive shaft 69
The rotation is transmitted to the pulley 101 via the feed roller pulley 103 and the belt 105, and the separation section conveyance roller 45 rotates in the direction of the arrow. At this time, if the separation motor 85 does not drive the conveying roller shaft 95 or if the driving of the conveying roller shaft 95 by the heald drive motor 61 is slower, the conveying roller shaft 95 and the conveying roller gear pulley 92 idle, The rotation of the separation section conveyance roller 45 is entirely controlled by the belt drive motor 61. Here, if the pulley ratio is determined by the pulley 101 and the feed roller pulley 103 such that the outer circumferential speed of the driving side feed roller 49a and the outer circumferential speed of the separation section conveyance roller 45 are the same, the formation in the first sea 1 bus It becomes possible to send out the original G to the downstream side from the feed rollers 49a and 49b while maintaining the loop of the original G.

In addition, when the heald drive motor 61 is stopped, the separation drive motor 85 is rotated and the electromagnetic clutch 106 is turned on, whereby the separation section conveyance roller 45, separation belt 47, half-moon paper feed roller 43, and drive side feed roller 49a are rotated. rotates in the direction of the arrow. At this time, since the rotation of the feed roller drive shaft 69 is idle due to the one-way clutch 71 in the feed roller gear 70, the separation drive system rotates the drive side feed roller 49a without affecting the bell l to conveyance drive system at all. It can be rotated. As a result, the first seat bus ■
The document G inside is separated by the feed roller 49 by the drive motor 85.
It becomes possible to send out to the downstream side from a and 49b.

Further, as described above, the separation section conveyance roller 4 of the separation supply section
5. The semicircular paper feed roller 43 and the separation heald 47 are connected to a separation drive motor 85 and are driven to rotate in the direction of the arrow shown in FIG.

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 force direction, each roller 49a, 40
a, 50 are all rotated forward in the direction of the arrow shown by the solid line in FIG. (reverse rotation), and the drive-side feed roller 49a is configured not to rotate.

Further, an electromagnetic brake 109, a clock disk 110, and a bell 1-clock interrupter 111 are connected to the output shaft of the belt drive motor 61.
1, a pulse signal is generated from the heald clock interrupter 111.

Furthermore, as shown in FIG.
3a and the drive-side downstream discharge roller 55a are connected to a 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 denotes a key designated when performing single-sided copying from a double-sided original. When this key is designated, the ADF 7 performs a double-sided mode operation to be described later.

203 is an LCD (liquid crystal) type message display, for example, 5 x 7 characters form one character, 4
Can display 0 character messages.

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

D. The control device W300 of the device main body 1 will be explained.

In FIG. 6, 301 is a central processing unit (CPU) that performs arithmetic control for executing the present invention. Reference numeral 302 denotes a read-only memory (ROM) in which a control procedure (control program) for the device is stored in advance, and the CPU 301 controls each component device connected via the /< bus according to the control procedure stored in this ROM 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.
It is.

305 is an interface (Ilo) that outputs the CPO 301 control signal to the load of the main motor 19; 306 is an interface that inputs input signals from the tip sensor 16, etc. and sends them to the CPU 301; 307 is a human output control for the key group and display group. This is an interface to

The display group includes each display in Fig. 5, and LE
D or LCD is used. The key group includes each key shown in FIG. 5, and the CPU 301 can determine whether a key has been pressed using a well-known key matrix.

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

The reference numeral 400 in FIG. 6 is a block diagram showing a control circuit for operating the present invention.
It is mainly composed of a well-known one-deep microcomputer (hereinafter referred to as cPU) 401, which has built-in M, RAM, etc., and also sends and receives signals to and from the control device 300 of the copying machine main body 1, and performs calculations related to the ADF 7. is under control.

Signals from a document detection sensor S1, a paper feed sensor S2, and a paper discharge sensor are sent to input ports 11 to 3 of the CPU 401, respectively. Also, CI) U 401 interrupt terminal 1
A signal from the discharge clock interrupter 1]5 is input to ntl to jnt2, and as described later, this becomes a reference clock for the amount of movement of the document G, and a counter inside the CPU 401 performs an operation for each column 1. . on the other hand,
Output signals 01 to 05, 08 to the output capo-1 of the CPU 401 include the operation signal of the separation drive motor 85 mentioned above, the cw and ccw signals for operating the belt drive motor 61 in forward and reverse directions, the electromagnetic rake 109, the paper discharge drive motor 112, and the electromagnetic clutch 106
The operation signal of each driver D I”D is output.
5. Control each output load via D a. In addition, a cable 40 transmits and receives signals to and from the control device 300 of the copying machine main body 1.
2, and input ports ■4 to ■6 of the CPU 401.
, a document feed signal, a document discharge signal, and a mode signal are input manually, respectively, and are sent from output ports 06 to 07 to drivers D6.
A copy request signal and original detection signal are output via D7. Each signal will be described later. Reading these input signals or turning on/off the load is done by the CPU.
The determination is made based on the program stored in the ROM in 401.

q Next, the operation of this embodiment will be explained along the operation explanatory diagrams of FIGS. 7 and 8 and the flows shown in FIGS. 9 to 18.

In FIG. 9, load a stack of originals onto the original loading tray 42 of the ADF 7 (S9-1), and use the ``2'' key on the operation panel to set the mode to single-sided mode or duplex mode 1 (S9-2).
, by pressing the copy start key 201 (S9-3)
Processing is 1-star. When setting single-sided mode with 59-4,
First, by turning on the document feed signal (S9-5), single-sided mode processing of the ADF 7, which will be described later, is performed (S9-6), and the document G is stopped at the exposure position X of the platen crow 2. Then, the copy request signal is turned on from the ADF 7 (S9-7
), turn off the document feed signal (S9-8), and turn on the illumination lamps 9 of the copying machine main body 1 (S9-8).
9) Turn on the optical motor 12 and start the scan
to (39-10). Then, at the end of the scan (S9
-11), return to step 59-4, and the following 59-4 to S
Repeat step 9-1.1 to read the image. Also,
When duplex mode 1~ is set in step 89-4, by turning on the document feed signal as in the single-sided mode, (
s9-12), double-sided mode processing of the ADF 7, which will be described later, is performed (S9-1.3), and image reading is performed by performing the same steps from 59-7 onwards to the single-sided mode.

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

[When copying 4 originals in simplex mode, the 3 simplex mode program (Figure 10) includes step 31 for performing separation processing.
0-1, and as shown in FIG. 12, the separation drive motor 85 is turned on so as to separate only one sheet of the lowest document page 4 in the document stack (512-1), and the document G is the first sheet. After the paper feed sensor S2 detects the leading edge of the original (S12-3), the separation drive motor 85 is turned off (512-5) after the paper feed sensor S2 detects the leading edge of the original (S12-3). The tip touches the nip portion of the feed rollers 49a and 49b, and stops after a predetermined amount of loop is formed. Additionally, start a timer to stabilize the loop5.
12-6), and after completion (S12-7), the separation process is ended. 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 block that constitutes the control means Y, and separates the separated original G so as to transport it to a position close to the upstream side of the platen crow 2 during the reading operation of the previous original. Controls the drive motor 85 and electromagnetic clutch 106.

That is, as described above, the leading edge of the document G is moved to the feed roller 49.
When the separation process is completed by hitting the nip portions of paper sheets a and 49b, the process proceeds to step 818 in which a pre-feeding process is performed, and the first
As shown in Figure 8, turn on the electromagnetic clutch 106 51.
8-1), further turn on the separation motor 85 (18-2)
), separation parts 45, 47, and feed rollers 49a, 49
Start driving b. Furthermore, at the same time, the held counter (B,
CO) to star 1-L/(318-3), the bell 1~
Wait for the counter (BCO) 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 center line of the plates 9a and 49b to the end surface of the platen glass 2. When the belt counter (BCO) is finished, the separation drive motor 8
518-5), and further turns off the electromagnetic clutch 106 (S18-6), so that the leading edge of the unexposed original G reaches the end surface of the platen glass 2, and reaches just before the exposed original G. It will be sent.

Next, the process advances to step S10-2 to perform paper feeding processing, and the first
As shown in FIG. 3, a feed roller 49a.

49b and the full-surface belt 41 to convey the document G from the first sheet path I to the second sheet path ■.
At the same time as the heald drive motor 61 is turned on for forward rotation (S13-1), a size check counter that counts based on the clock input from the belt clock interrupter 111 is activated (513-2) to measure the document size. Then, the document G is transported and the trailing edge is detected by the paper feed sensor S2.
(313-3), the size check force counter is stopped (513-4), and based on that data, the document size is determined in the size check SUB shown in FIG. 17, and at the same time, the document G is Register counter RGCN to be stopped at exposure position X on platen glass 2 is set to star 1-L/(S13-6), register counter RG
Until the CN ends, the speed of the bell 1 drive motor 61 is lowered and stopped instantly by the electromagnetic brake 109, and the speed of the belt drive motor 61 is controlled in order to obtain an accurate stop without variation. (S13-7)
, when the registration counter ends (S13-8), the heald drive motor 61 is simultaneously turned off (313-9), and the electromagnetic rake 109 is turned on (313-10), thereby moving the original G to the exposure position X on the platen glass 2. Stop accurately (see Figure 7(a)). Here, in the size check SUB, as shown in FIG. 17, as a method of determining the document size, the size check counters 1 to 2 are measured from the nip position of the feed rollers 49a and 49b to the paper feed sensor S2. The true original size is obtained by adding the distance and correcting it (Sl'1-1). At this time, the document G is being conveyed by the feed rollers 49a and 49b and the full-surface belt 41, and the feed amount and belt clock interrupter 11
Count values calculated by one person are sure to match. B5. A4. A4R, B4. A
4R, B4. Determine the size such as A3 (S17-2
, 517-3).

Next, proceed to step 5IO-3 (Figure 10) and C0PY
By outputting a request signal to the main body 1 of the apparatus, the copying machine temporarily turns off the document feed signal, and activates the optical system to detect the document page 4 set at the exposure position X on the platen glass 2 with the image surface facing downward. An exposure copying process is performed.

An image G of the original page 4 is formed on the first side of the transfer paper P,
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 turned off. Here again, since it is the page 4, the document detection sensor S1 is on, and then a signal is sent to the mode 1 from the main body 1 of the apparatus to check whether there is a signal or not (S), 0-
5) Furthermore, the flow of the subsequent program is changed depending on whether the original size of the page 4 is larger than Δ4R by determining the original size as described above (S10-6). Here, the explanation will be continued assuming that the mote signal is a continuous transmission designation.

If the size of the document page 4 is smaller than A4R, the above-mentioned separation process (SIO-1) and pre-feed process (S18) are executed before the exposure process for the document G on the page 4 is completed, and the document of the next page 3 is G is sent to the end face of the platen crow 2 and stopped. Then step S i
The process proceeds to O-7, where the document feed signal is turned on upon completion of the exposure process of the document page 4 of the apparatus main body 1, and the C0PY request signal is thereby turned off, and the next operation begins.

In step S10-8, the "origami processing" is activated, and the process returns to step S10-2 to enter the document page 3 feeding process.

Here, the paper ejection process 1 started in the previous step will be explained using FIG. 15. The situation at the time when the paper ejection process 1 is activated is as shown in FIG. 7(a). here,
The page 4 waits for the sensor S3 to detect the leading edge of the document on the page 4 (S15-1). However, at this time, paper ejection processing 1
In this case, the entire belt 41 cannot be driven. Therefore, the process returns to step S10-2 to feed the next document page 3, and then step S10-3 in FIG.
~S 10-7 When executed, the relationship of manuscript G becomes the seventh
The result will be as shown in figure (b). Furthermore, the paper discharge process 1 is started for the document on page 3 (SIO-8). Furthermore, in the middle of the paper feeding process for the document on page 2, as shown in FIG.
The paper ejection sensor S3 detects the leading edge of the document, starts a belt counter corresponding to the distance from the nip between the downstream ejection rollers 55a and 55b, and waits for the belt counter to complete. (S15-2).

When the bell 1~counter ends, the paper ejection drive motor 112
Turn on, start pulling out the original G on page 4, and wait for the rear edge of the original G to be detected by the paper ejection sensor S3 (
315-3). After this, as shown in Fig. 7(d), the page 2
Even if the full-surface belt 41 stops after the original document feeding process (SIO-2) is completed, the original G on page 4 continues to be ejected in the direction of the arrow by the downstream ejection rollers 55a and 55b, and the ejection sensor When S3 detects the trailing edge of the original G on the page 4, the paper ejection clock interrupter 115, which is capable of completely ejecting the original G, starts the paper ejection counter counted by the microcomputer 901. Waiting for the end of the paper ejection counter while controlling the speed of the paper ejection drive motor 112 until the ejection of the original document G is completed.
When the process is completed, 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 amount of feed by the paper ejection counter and the amount of feed by the downstream ejection rollers 55a and 55b reliably match. Thereafter, while the document detection sensor s1 detects the document G, the above-described sequence is repeated.

Additionally, the document detection sensor S1 no longer detects the document G.
In this embodiment, after the paper feeding process for page 1 is completed and step S10-4 is executed, the document detection sensor S1
is off, the process advances to step 5IO-9, where the document detection signal is turned off, and when the document ejection signal from the main body 1 is set, the C0PY request signal is turned off, and the ejection processing 2 is started.
(SIO-10).

At this point, the state of the original G is as shown in FIG. The motor 61 is turned on for normal rotation (S16-1).

At this time, the document G on page 2.3 is undergoing the corrected paper ejection process 2 at the same time.

When the leading edge of the document G on page 4 is detected by the paper ejection sensor s3, the belt counter BC1 is started (516-2), and when the BCI is completed, the paper ejection drive motor 112 is turned on (516-2). , Furthermore, a held counter BC2 is started which determines the timing at which the separation process for the next document G is permitted to start. In this embodiment, the counter BC2 is set to a position where the trailing edge of the document is separated from the position of the turn roller 40b (S16-2). That is, as shown in FIG. 7(f), the counter value is set to ((document length) -).

Here, when the belt counter BC2 ends, the heald drive motor 61 is turned off and the separation start permission flag is set to the cellar 1 (S16-4). Here, since there is no next document to be separated, 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, as in the ejecting process 1 (S16-5).

Also, in step 5IO-5 of the above sequence, if the mote signal does not specify continuous sending, or if the original size is A4R or
4, the above-mentioned transport mode is stopped and the sequence is changed to one in which the document can be reliably pulled out by the downstream discharge rollers 55a and 55b. After the document feed signal is set, the copy request signal is turned off and the above-mentioned paper ejection process 2 is started (810-1
2). Thereafter, as shown in FIG. 7(f), in step 516-4 during the paper ejection process 2 for the document on page 4, when it is detected that the separation start flag is set, the flag is reset. , starts the separation process for the next document G, that is, the document G on page 3 (810-13).

Thereafter, as described above, the process is repeated until all the documents G are removed from document stacks 1 to 42.

[When copying two sheets of both sides of an original in duplex mode] The duplex mode program (Figure 11) is similar to the one-sided mode, and copies the lowest originals (pages 3 and 4) on document stack 1 to lay 42.
The above-mentioned separation process (SlO-1) and paper feeding process (810
-2), and then proceeds to step 5ll-3 where the reversing process shown in FIG.
Then, the belt drive motor 61 is turned on in reverse in order to convey it to the fourth sheet bus (514-1), and the original is held between the large reversing roller 50 and the reversing roller 51, and then advances to the fifth sheet bus V inside the bus V. After the paper feed sensor S2 detects the light edge of the document (S14-2), the reversal loop counter is started (514-3), and after the completion (814-4), the bell 1 to the drive motor 61 are turned off ( In step S14-5), a loop is formed to correct the skew of the original as in the separation process, and the process waits (see FIG. 8(b)).

Next, as in the single-sided mode, the copy request signal is turned on (511-5) with paper feeding processing (Sll-4), and the main body 1
When the document feed signal from Sera I is received (Sll-6)
, turns off the copy request signal (Sll-7).

Next, in order to copy page 3, the above-mentioned reversal process (31
, 1-8), further performs paper feeding processing (s11-9), and turns on the copy request signal 511-10). At this time, the state of the document detection sensor S1 is determined (311-10).
11), if the next document G is detected, step 81
Proceed to step 1-12, the document feed signal from the main body 1 of the apparatus is corrupted, and step c.

Turn off the py request signal and start the above-mentioned paper ejection process 2 (
811-13). Further, in step 511-14, after the discharged document reaches the predetermined position described above (FIG. 8(e)) and the separation start rack is set, the separation start rack is reset and the process returns to step 811-1. , starts processing the next document G. Thereafter, the above-described sequence is repeated until the document G is removed from the document stacking tray 42, that is, until the document detection sensor S1 no longer detects the document G in step 311-11, and the document detection sensor S1 detects the document G. If so, proceed to step 511-15, turn off the document detection signal, set the document discharge signal from the apparatus main body 1, turn off the C0PY request signal, start the above-mentioned paper discharge process 2, and end (811-15). -16).

In this way, the above operations are executed one after another for the originals G loaded on the original stacking tray 42, so that the same page as the original G set and bound 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) As described in detail, according to the present invention, the document reading position is located at the most upstream side of the platen glass, and during the document reading operation at the document reading position, the conveying means reads the next document. Equipped with a control means that drives the document to a position close to the upstream side of the platen glass, so regardless of the size of the document, it is possible to always minimize the loss of time required to change the document at the document reading position. can. Therefore, without increasing the document conveyance speed or changing the normal scanning method, the time required to replace the document can be shortened, and the image reading efficiency of an image reading device such as a copying machine can be improved. In addition, since the document before being read is not on the platen crow, there is no reduction in stopping accuracy due to repeated conveyance and stopping on the platen crow 2, and furthermore, there is no restriction on adjusting the gap between the sheets of the document or reading the document. That's not the case.

Furthermore, if the conveyance means is a conveyance roller that conveys the document after forming a loop, the document can be conveyed to the document reading position without skew.

[Brief explanation of the drawing]

FIG. 1 is a side view of a document conveying device according to an embodiment of the present invention;
Figure 2 is a side view of the copying machine in which the document conveyance device is installed, Figure 3 is a top view showing the belt conveyance drive system, Figure 4 is a top view showing the separation drive system, and Figure 5 is the operation unit. , FIG. 6 is a block diagram showing the circuit of the copying machine main body and the control device of the original conveyance device, and FIGS. 7 and 8 are operation explanatory diagrams according to the embodiment of the present invention. Single sided mode, Figure 8 shows operation in double sided mode. Further, FIGS. 9 to 18 are flowcharts showing operations according to the embodiment of the present invention. 2...Platen crow, 2a...Inlet to platen glass (platen glass inlet), 7...Document conveyance device, 45.47...Separation means (separation unit conveyance roller, separation heald), 49a , 49b... Conveyance means (feed roller), G... Document, X...
Original reading position (exposure position), Y...control means.

Claims (1)

[Claims] 1. In a document conveying device that sequentially conveys documents to a document reading position on a platen glass and discharges the documents from the reading position, the document reading position is located downstream of the read document. A conveyance means is provided so that an end thereof is near the entrance to the platen glass, and conveys the document toward the platen glass, and the conveyance means is operated during the document reading operation at the document reading position. . A document conveying device comprising: a control means for driving the next document to be conveyed until the leading edge of the document is close to the upstream side of the platen glass. 2. The document conveying device according to claim 1, wherein the conveyance means is a conveyance roller that conveys the document after forming a loop on the document separated by the separation means.