JPH01236136A - Original conveyor - Google Patents

Abstract

PURPOSE:To aim at the shortening of original changing time by installing an original conveying port in the neighboring upstream of an image reading position on a platen, and conveying the second original up to a standby position being not on a platen adjacent to the image reading position in advance. CONSTITUTION:A lowermost original of an original bundle 2 mounted on a tray 1 is fed piece by piece by a semicircular roller 4, a feed roller 5 and a separate belt 6, while its tip is made to bump against a nip part of each of feed rollers 9a, 9b in nonoperation whereby its skew is remedied and thus the original is on standby. Next, a feed roller 9 and a conveyor belt 11 are driven by a motor 12, feeding the original onto platen glass 101, and an original surface is read by means of optical scanning, and when it is a duplex original, it is again fed onto a platen 101 by c.w or c.c.w. rotation of the motor 12 via reverse rollers 16, 17 and when an original rear end is passed through an interval between feed sensors 8a and 8b, the next original 2 is fed and made to be on standby. When discharge of the read original is detected by a paper discharge sensor 19, the next original is fed onto the platen 101. Thus, a span of original changing time is reducible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a document conveying device that automatically feeds a document to a document reading position.

[Prior Art] Conventionally, an image reading device such as a copying machine is sometimes used with an additional document conveying device that automatically feeds a document to an exposure position and discharges the document after the exposure operation is completed.

[Problems to be Solved by the Invention] However, in conventional document conveying devices, regardless of the size of the document, the document is conveyed one by one to the copying position on the platen glass and stopped, and the document that has been exposed for copying is transferred. A method of transporting an original is used in which, at the same time as the original is ejected from the platen glass, the next original is transported to an image reading position, stopped, and exposed for copying, and the procedure is repeated. This document conveying method has a problem in that as the size of the document becomes smaller, the gap between the documents becomes wider, resulting in a loss of conveyance time, which in turn leads to a reduction in copying speed.

In addition, if the general feed speed is increased more than necessary to solve this problem, noise and wear on the conveyor belt will increase, and damage to the document will also increase when a feed failure occurs, which is a serious drawback. was causing

SUMMARY OF THE INVENTION The object of the present invention is to provide an original document conveying device that eliminates the above-mentioned drawbacks and can shorten the time required to exchange original documents without increasing the document conveyance speed.

[Means for Solving the Problems] In order to solve all of these problems, the present invention provides a method for transporting originals one by one through an original transport port to a predetermined position on the platen of an image reading device where image reading scanning is performed. A document conveying device that stops conveying the document at a predetermined position is provided with a conveying means for conveying and stopping the document at a predetermined position, and a control means for driving and controlling the conveying means, and the conveying means and the control means move the first document to the predetermined position. After stopping the transport, the second original is stopped at a position adjacent to the predetermined position that is not on the upstream platen, and then the first original whose image has been read is moved to a position where it can be transported by the transport means. At the same time as the second document is conveyed to a downstream position on the platen adjacent to the predetermined position, the second document is conveyed and stopped at the predetermined position, and for the third and subsequent documents, this procedure is repeated to sequentially stop the conveyance. It is characterized by causing

[Function] The present invention provides a document transport device that transports a document to a predetermined image reading position on a platen of an image reading device and then stops.
A document transport port is provided near and upstream of a predetermined image reading position (first position) on the platen, and after the first document is conveyed and stopped at the predetermined image reading position, the second document is transferred to the predetermined image reading position. The document is conveyed to a standby position (second position) that is not on the platen, which is an upstream position adjacent to the predetermined image reading position, and then the first document that has been read is moved to a position where it can be conveyed by the withdrawal means. At the same time, the second original is transported to a downstream position (third position) adjacent to the predetermined image reading position on the platen, and the second original is transported to the predetermined image reading position and stopped. Since this procedure is repeated, the time loss for replacing the original 1^ is not caused by the size of the original, and is always minimized.

[Embodiments] Hereinafter, embodiments of the wooden invention will be described in detail with reference to the drawings.

FIGS. 1 and 2 show an image recording device fi that can be used in the present invention.
In FIG. 1, which shows the internal configuration of an embodiment of the copying tube, 100 is a main body of a copying machine that has an image reading function and an image recording function, and 200 is a document feeding device that automatically feeds documents. (hereinafter referred to as ADF).

A. Copying apparatus main body (100) In the main body 100, 101 is a platen glass on which a document is placed, 103 is an illumination lamp (exposure lamp) that illuminates the document, and 105, 107, and 109 are lamps for the document. A scanning reflecting mirror (scanning mirror) that changes the optical path of the reflected light; 111 a lens having focusing and variable magnification functions; 113 a fourth reflecting mirror (scanning mirror) that changes the optical path;
+15 is an optical system motor that drives the optical system, and 117, 119, and 121 are sensors, respectively.

131 is a photosensitive drum, 133 is a main motor that drives the photosensitive drum 131, 135 is a high voltage unit, 137 is a blank exposure unit, 139 is a developing device, +41 is a transfer charger, 143 is a separation charger, and +45 is a cleaning device. be.

151 is the upper cassette, 153 is the lower cassette, 155
157 is a paper feed roller, and 159 is a registration roller. Further, 161 is a conveyor belt that conveys the recording paper on which an image has been recorded to the fixing side, 163 is a fixing device that fixes the conveyed recording paper by thermocompression bonding, and 167 is a sensor used for double-sided recording.

The surface of the photosensitive drum 131 described above is made of a seamless photoconductor using a photoconductor and an electric conductor. The motor 133 starts rotating in the direction of the arrow in the figure. Next, when the predetermined rotational control and potential control processing (preprocessing) of the drum 131 are completed, the original placed on the original platen glass 101 is illuminated by the illumination lamp 103 that is integrated with the first scanning mirror 105. The reflected light from the original is transmitted to the first scanning mirror 105 and the second scanning mirror 105.
Scanning mirror 107, third scanning mirror 109, lens 1
11.

The image is then formed on the drum 131 via the fourth scanning mirror 113.

The drum 131 is corona charged by a high pressure unit 135. After that, the image illuminated by the illumination lamp 103 (
The original image) is exposed to slit light, and an electrostatic latent image is formed on the drum 131.

Next, the electrostatic latent image on the photosensitive drum 131 is transferred to a developing device 139.
The toner image is developed by a developing roller 140 and visualized as a toner image, and the toner image is transferred onto a transfer paper by a transfer charger 141 as described later.

That is, the upper cassette 151 or the lower cassette 1
The transfer paper in 53 is fed into the main unit by paper feed rollers 155 or 157, and is sent toward the photosensitive drum 131 with accurate timing by registration rollers 159, so that the leading edge of the latent image and the leading edge of the transfer paper are aligned. Ru. Thereafter, the transfer paper passes between the transfer charger 141 and the drum 131, so that the toner image on the drum 131 is transferred onto the transfer paper.

After this transfer is completed, the transfer paper is transferred from the drum 131 to the separation band TL.
The sheet is separated by the paper sheet 143, guided to the fixing device 163 by the conveyor belt 161, fixed by pressure and heat, and then discharged to the paper discharge tray T outside the main body 100 by the discharge roller 165.

After the transfer, the drum 131 continues to rotate, and its surface is cleaned by a cleaning device CL 145 comprising a cleaning roller and an elastic blade 413.

B. Automatic document feeder (80F) (200) FIG. 2 shows the internal configuration of the ADF 200 described above.

In the figure, reference numeral 1 denotes a stacking tray (loading table) on which originals 2 are stacked and set. This tray 1 is arranged to be inclined downward in the direction of sending out the originals so that the sending side of the originals 1-1 is lower. Then, the fed documents are stacked on the tray 1 in alignment in the sending direction. 4 is a half-moon-shaped roller that rotates in the direction of the arrow in this figure and has the function of feeding the original to the 1ff11 downstream portion.If there is no original on tray 1, the notch of roller 4 is It is controlled so that it stops towards. A feeding roller 5 feeds the document on the tray l by rotating in the direction of the arrow in the figure. Furthermore, 6a and +ib are separation rollers, and by rotating the separation belt 6 in the direction of the arrow in the figure, the separation rollers 6a and 6b work together with the feeding roller 5 to separate the documents stacked on the tray 1. The lowest original is separated into individual sheets. This feeding roller 5 and separation belt 6 constitute a separation supply section.

3a and 3b are transmission type photosensors for detecting the presence or absence of documents placed on the tray 1, and 3a is an LED (
A light emitting diode), 3b is composed of a phototransistor. The document sent from the 0-separation supply section 5.6 is
The feed rollers 9a pass through the sheet path I and are pressed against each other.
, 9b, and the platen glass 101 passes through the sheet path 11 by rotating the roller in the direction of the arrow in this figure.
It is sent to the upper seat path I11. Feed rollers 9a, 9
Paper feed sensors 8a and 8b disposed near the upstream side of document b are transmission type photosensors that detect the leading edge and trailing edge of the document.

[Platen glass] The full-surface belt 11 placed close to the platen glass 01 is an endless belt with a width large enough to cover the entire surface of the sheet original, and its surface allows the original to slide on the platen glass 101 using frictional force. It has a sufficient coefficient of friction so that it can be conveyed in the direction of the arrow, and is wrapped around the drive roller loa and turn roller tob so that the entire belt 11 and the drive roller 10a do not come apart. It is configured.

Seat pass downstream of the above seat pass I11! The tenth ejection rollers 18a and 18b disposed at the entrance of (2) are pressed against each other, and the originals ejected from the platen glass 101 by the movement of the full-surface belt 11 in the direction of the solid arrow in the figure are While rotating in the direction of the arrow, pinch and convey.
The document is passed through the upwardly curved sheet path v1, sandwiched between the 20th discharge rollers 20a and 20b, and discharged onto the discharge tray 24 above. A paper discharge sensor 19 provided in the middle of the sheet path Vl is a reflective photosensor that detects the leading edge and trailing edge of the document.

Furthermore, when double-sided document reading is performed, the document on the platen glass 101 is reversely conveyed to the sheet path Iv by the movement of the full-surface belt 11 in the reverse direction of the arrow 8n, and the document on the platen glass 101 is conveyed to the sheet path Iv, and the document is transferred to the reversing large roller 16 which is pressed against each other. After being gripped by the reversing roller 17, the leading edge of the document is sent to the sheet path V along the roller 16 by the rotation of the large reversing roller 16 in the direction of the solid arrow in this figure. roller 9
a and 9b, and is sent onto the platen glass 101 through the sheet path II again. As a result, the front and back of the document are reversed with respect to the platen glass 101.

In addition, the feeding roller 5 and the half-moon roller 4 of the above-mentioned branching supply section
The separation rollers 6a and 6b are each connected to a separation drive motor 7 via a transmission mechanism, and are driven in the direction of the arrow in the figure.

In addition, feed rollers 9a, 9b, belt drive roller 10
a, IOb, and the large reversing roller 16 are each driven by a belt drive motor 12 via a transmission mechanism.

This motor 12 can be rotated in forward and reverse directions; for example, when the motor 12 rotates in the forward (CW) direction, all the rollers are rotated in the direction of the solid arrow;
When rotating in the W) direction, the belt drive roller lea, 10
b. The large reversing roller 16 rotates in the direction of the chain arrow, but the feed rollers 9a and 9b are a clutch mechanism that does not rotate. An electromagnetic brake 13, a clock disk 4, and a clock generator 15 are mounted on the rotating shaft of the belt drive motor 12.
The rotation of the motor 12 causes the clock generator 15 to generate a pulse signal.

Further, the 10th paper ejection line 18a, 18b and the 20th line
The rollers 20a and 20b are each connected to a paper discharge drive motor 21 via a transmission mechanism, and are driven in the direction of the arrow in the figure. A clock disk 22 and a clock generator 23 are connected to the rotating shaft of the paper ejection drive motor 21, and as the motor 21 rotates, the clock generator 23 generates a pulse signal.

C. Key Group (500) FIG. 3 shows an example of the layout of the operation section of the copying machine shown in FIG. 1.

In FIG. 3, 602 is an all reset key;
Press to return to standard mode.

604 is a copy start key (copy start key);
Press to start copying.

605 is a clear/stop key, which functions as a clear key during standby and as a stop key during copy recording. This clear key is pressed to cancel the set number of copies, and the stop key is pressed to interrupt continuous copying.The copying operation stops after the copying at the time when this key is pressed is completed.

Numeric keys 606 are pressed to set the number of copies.

Copy density keys 608 and 609 are pressed when manually adjusting the copy density. 610 is the ^E key,
Press this button to automatically adjust the copy density according to the density of the original, or to cancel 8E (self rBJ density adjustment) and switch the density adjustment to manual. 611
is a cassette selection key, which is pressed when selecting the upper cassette 151 or the interrupted cassette 153. Also, 80F2
When a document is placed on 00, - this key 611
8PS (automatic paper cassette selection) can be selected. When 8PS is selected, a cassette of the same size as the original is automatically selected.

612 is an equalization key, which is not pressed when copying at the same size (original size), and 613 is an auto-magnification key, which automatically reduces or enlarges the original image according to the specified transfer paper size. Press when Zoom keys 614 and 615 are pressed to specify any magnification between 64 and 142t. 616 and 617 are fixed size scaling keys, which are pressed when specifying reduction or enlargement of the fixed size.

Reference numeral 618 is a key designated when performing single-sided copying from a double-sided original, and when this key is designated, the 80F200 performs a double-sided mode operation to be described later.

, D. Display group (700) In FIG. 3, 701 is an Lll:D (liquid crystal) type message display, for example, one character consists of 5×7 dots and can display a 40-character message.

Further, 705 is a copy number display, which displays the number of copies or a self-diagnosis code. Reference numeral 706 is a used cassette display, which displays which of the upper cassette 151 and the suspended cassette 153 is selected.

708 is an E indicator, and the AE key 610
Lights up when (automatic density adjustment) is selected.

710 is a ready/wait indicator, which is a two-color LED of green and orange; green lights up when ready (when copying is possible) and when waiting (when copying is not possible).
lights up orange.

E. Control equipment (800) Fig. 4 (^) shows an example of the circuit configuration of the control bag e800 of the embodiment shown in Fig. 1. In Fig. 4, 801 performs arithmetic control for carrying out the present invention. The central processing unit (CPU) is, for example, a microcomputer μC0M87AD manufactured by NEC (Niki Electric Co., Ltd.).

Reference numeral 803 is a read-only memory (ItOM) in which a control procedure (control program) according to the present invention is stored in advance, and the CPU 801 controls each component device connected via the bus according to the control procedure stored in this ll0M803. . Reference numeral 805 denotes a random access memory (rlAM) which is a main storage device used for storing input data and as a working storage area for the CpH 801.

807 is CPIJ801 for loads such as main motor 133.
Interface (110) for outputting control signals, 8
09 is an interface 811 that manually sends input signals from sensors such as the image tip sensor 121 to the CPt 1801;
is an interface for controlling input/output between the key group 600 and the display group 700. As these interfaces 807, 809, and 811, for example, an input/output circuit board μf'D8255 manufactured by NEC is used.

Note that the display group 700 is each display device shown in FIG. 3, and uses LEDs and LCDs. The key group 600 is each key shown in FIG. 3, and the CPU 801 can determine which key has been pressed using a well-known key matrix.

F, ADF control head (900) Figure 4 (B) shows the 80F for operating the present invention.
The controller 820 of this control circuit is mainly composed of a well-known one-chip microcomputer (hereinafter referred to as a microcomputer) that has built-in ROM, RAM, etc.
ADF while exchanging signals with CPUll0I of 00
It performs arithmetic control regarding 200.

The input boat 1l-I of the controller 820 receives a signal S! from the inlet original sensor la, 3b provided in the downstream direction of the tray 1 of the aforementioned ΔDF20Q. , signals S from sheet sensors 8a and 8b provided on the document transport bus.
2 and a signal S3 from a paper discharge sensor 19 provided on the paper discharge bus are respectively input.

In addition, the microcomputer interrupt terminal lNTl of the controller 820
- INT2 has the belt drive motor 1 mentioned above in Fig. 2.
The signal from the belt crotter interrupter 15 which detects the rotation of the motor by means of a clock disk 14 attached to the motor shaft of the second motor, and likewise the signal from the discharge clock interrupter 23, is manually inputted. As will be described later, these signals serve as reference clocks for the amount of paper feed of the original, and are used for each counting operation by a counter inside the controller 820.

On the other hand, the output ports 01 to 0 of the controller 820. The operation signals for the aforementioned separation drive motor 7, the cw and ccw signals for operating the belt drive motor 12 in forward and reverse directions, and the electromagnetic brake 13. An operation signal for the paper ejection viA motor 21 is output, and the output load is controlled via each of the drivers D1 to D5.

Further, the controller 820 is a CP of the copying apparatus main body 100.
Sends and receives signals to and from U801 via cable 901,
Therefore, the input ports I4 to I6 of the controller 820
A document feed signal, a document discharge signal, and a mode signal are respectively input to the output ports 0. ~07 to driver D6. D? A C0PY request signal and a document detection I= number are outputted via. Each signal will be described later.

The reading of these human input signals, the on/off of loads, etc. are carried out by the microcomputer of the controller 820 according to the control program (control procedure) stored in the ROM in the controller 820, as shown in FIGS. controlled by

Next, with reference to the flowcharts shown in FIGS. 5 to 12, the operation explanatory diagram in FIG. 13, and the configuration diagram of 80F in FIG. The actual control operations when the 〇F single-sided mode (A) and the 〇F double-sided mode (B) are respectively designated will be explained.

A. (Single-sided mode) In the case of an example of copying 14 originals The flowchart in FIG. 5 shows the controller 820 in the one-sided mode.
In this example, the controller 820 first proceeds to step S1 in which the separation process shown in FIG. 5 is performed, and in the separation process subroutine shown in FIG. Minute 5 to separate only one page ■! t Start (turn on) the drive motor 7 (step 5101). When the motor 7 starts, the half-moon roller 4 rotates and the document page ■ advances within the sheet bus ■, so the paper feed sensor 8 detects the leading edge of the document. After that (step S102), the separation loop timer is started (step S102).
103), after the timer ends (after time-up) (step S104), minute Ii! lt drive motor 7 is stopped (
off) (step S105). As a result, the document stops with its leading edge touching the nip portion of the feed rollers 9a and 9b, and a loop (curved shape) of a predetermined amount being formed. The above operation has the effect of correcting the skew even if the document skews when it is separated.

Next, the process proceeds to step S2 in FIG. 5 where paper feeding processing is performed, and in the paper feeding processing subroutine shown in FIG. 8, the belt drive motor 12 is started to rotate normally and the feeding roller 9a is activated.

9b and the entire belt 11 are driven (step S2
01), the document is transported from sheet path I to sheet path II. At the same time, the size check counter in the controller 820, which counts based on the clock input from the belt crotter interrupter 15, is started to measure the document size (step S202). ing.

Then, as the document is transported, the trailing edge is detected by the paper feed sensors 8a and 8b.
At the same time as passing through (step S203), the above-mentioned size check counter is stopped (step S204).
, based on the count data, in the size check subroutine shown in FIG.
Start the GCN (Step 320B) until the registration counter RGCN finishes counting (Step 3
208), the speed of the belt drive motor 12 is lowered in order to obtain an accurate stop without variation (step S207), and the belt drive motor 12 is stopped at the same time as the registration counter rlGcN finishes counting. Step S209), and the electromagnetic brake 13 instantly stops the document feeding, thereby stopping the document accurately at the exposure position on the platen glass 101 (Step 5210).

Here, in the size check subroutine, as shown in FIG. 9, as a method of determining the document size, the distance from the nip position of the feed rollers 9a, 9b to the paper feed sensors 8a, 8b is added to the data of the size check count described above. The corrected size becomes the true original size. At this time, the amount of document feed and the count value by the belt clock interrupter definitely match (step S2).
20). After that, the corrected original size data
5. A4゜[Determine the document size such as 14 or A3 (
Steps S221-229), clear the size check counter and return (step 5230).

Next, after the paper feeding process described above, the process proceeds to step S3 in FIG.
Output to 01. The CPU 801 of the main body of the copying machine is C0P.
In response to the input of the Y request signal, the document feed signal is temporarily turned off, and then the optical system is activated to execute the exposure copying process for the document page (2) set on the platen glass 101 with the image surface facing downward.

Next, the image on the original page ■ is transferred to the first copy material (recording paper).
The copy material is discharged onto the copy tray T with the image side facing upward (see FIG. 1).

While the copying apparatus main body 100 is in the exposure process, the program sequence shown in FIG. 5 proceeds to step S4, and it is determined whether all original documents have been fed based on whether or not the entrance document sensors 3a and 3b are turned off. At this point, since the image recording process of the document on page #2 is still in progress, the entrance document sensor 8a
, 8b are in the ON state, it is then determined whether the mode signal from the main body 100 is continuous feeding (step S5), and when the determination is affirmative, the original size determination in the size check subroutine described above is performed. The flow of the subsequent program is changed depending on whether or not the document size of page (2) is equal to or larger than F4r1 based on the document size data obtained in (step S6). Here, the explanation will be continued assuming that the mode signal is a transportation designation.

If the document size of the page ■ is smaller than ^4R, the process proceeds from step S6 to step S7, and the above-mentioned separation process (
Step Sl) is executed before the exposure process for the document of page ■ is completed, whereby Mobara ■IS■ is brought into contact with the feed rollers 9a and 9b and stopped in a loop-forming state.

Next, the process proceeds to step S8, where the document feed signal is turned on upon completion of the exposure process of the document page (2) in the copying apparatus main body 100, so the copy request signal is turned off in response to the turning on of the document feed signal. The next operation begins (step S9).

In the next step SIO, the paper ejection process 1 is started by an interruption, and the process returns to step S2 described above, and the paper feeding process for the original on page 2 is started.

Here, the processing procedure of the above-mentioned paper ejection processing 1 will be explained. The situation at the time when the paper ejection process 1 starts is as shown in the 13th page.
The situation is as shown in Figure (A). Then, in the subroutine of the paper ejection process 1 shown in FIG. 10, the process waits until the paper ejection sensor 19 detects the leading edge of the document on the page (2) (step S301).

However, at this time, in the paper ejection process 1, the entire belt lO
is not driven. Therefore, during this waiting period, step S
When the process returns to step 2 and feeds the next document page (2), and steps 53 to S7 in FIG. 5 are executed, the positional relationship of the documents becomes as shown in FIG. 13(B).

Further, the paper discharge process 1 is also started for the document on page 2 (step S10). □Furthermore, when the paper ejection sensor 19 detects the leading edge of the document on page ■ as shown in FIG. 13(C) during the paper feeding process for the document on page ■,
- Start the belt counter BCI by the count value corresponding to the distance to the nip between the rollers 20a and 20b.Step S
302), and waits for the belt counter BCI to end (count up) (step S303).

When the belt counter BC1 finishes counting, the paper ejection drive motor 21 is turned on (step S304).
, page ■ begins to be pulled out, and waits for the paper discharge sensor 19 to detect the trailing edge of this document (step S3 (15)).

After that, as shown in FIG. 13(D), the paper feeding process (step S2) for the original on page 2 is completed, and the entire surface of the belt 10 is
Even if the original page m is stopped, the ejection rollers 20a and 20
b continues to be ejected in the direction of the arrow in this figure, and at the same time as the paper ejection sensor 19 detects the trailing edge of the document on page ■, the clock of the paper ejection clock interrupter 23 is counted in order to completely eject this document. A paper ejection counter is started (step S306), and the speed of the paper ejection drive motor 21 is controlled until the paper ejection counter ends (step 5307) to improve consistency when ejecting documents. , waits for the count from the paper ejection counter to end (step S308). When the paper ejection counter finishes counting, the paper ejection drive motor 21 is turned off and the original is ejected onto the paper ejection tray 24, thus ending the paper ejection process (step S309>).

At this time, the feeding pattern by the paper ejection counter and the ejection roller 20 are
The feed amounts by a and 20b are definitely the same.

Furthermore, while the entrance document sensors 3a and 3b detect the document thereafter, the above-described processing sequence is repeated.

Thereafter, when the above-mentioned entrance document sensors 3a and 3b no longer detect the document, in the tree embodiment, when the paper feeding process for the document of page ■ is completed and the determination process of step S4 is executed, the entrance document If the sensors 3a and 3b are off, the determination is negative and the process proceeds to step Sll, where the document detection signal is turned off and the document discharge signal from the copying apparatus main body 100 is set (step S12). The C0PY request signal is turned off (step 513), and the paper ejection process 2 is started with an interrupt (step S14).

The positional relationship of the originals at this point is as shown in FIG. 13 (E), and as shown in FIG.
In the routine, the belt r! is used to eject the pages ■ and ■ remaining on the platen glass 101. IAyh
Turn on motor 12 in normal rotation (step S311)
.

At this time, the above-mentioned paper ejection process 1 is being executed on the documents of pages (2) and (2) at the same time.

When the paper ejection sensor 19 detects the leading edge of the document on the page ■, step S312), similarly to the paper ejection process 1 described above,
The counting operation of the first belt counter [lCI is started (step S 313), and when the count of this counter BCI is finished (step S 314), the paper ejection drive motor 21 is turned on (step S 315), and then the next The counting operation of the second belt counter nc2, which determines the timing to permit the start of separation processing of the original document, is started (step 5316). In the tree example,
The count value of the counter 8C2 up to the position where the trailing edge of the document leaves the downstream belt roller 10b is set in advance.

That is, as shown in FIG. 13 (CF), the counter [lC2
The counter value is set to ((document length) - 1). λ is the distance between the belt roller 10b and the sensor 19.

When the count of the belt counter BC2 is completed (step 5317), the belt drive motor 12 is turned off (step 3318), and the division start permission flag is set (step 3319). Here, since there is no document to be separated next, the actual operation is not affected. The influence of this flag will be described later.

After that, the sequence for aligning the ejected originals is executed and the process ends in the same way as in ejecting process 1 (steps 3320 to 3).
23).

Further, if the mode signal does not specify continuous feeding in step S5 of FIG. 5, or if the document size is 4R or more in step S6, the above-mentioned transportation mode is stopped and the document can be reliably pulled out by the paper ejection rollers 2Qa and 20b. To change the sequence to such a sequence, proceed to step 315 and
C
The 0PY request signal is turned off (step 5la), and the paper ejection process 2 described in i is started with an interrupt (step S
17).

Thereafter, as shown in FIG. 13(F), at step 5319 in the paper ejection process 2 for the document on page 1, it is detected that the separation start permission flag is set (step 5ta), and at the same time, this flag is reset. Then, the next document, that is, the document on page 2--[processing is started (step 519). After that, the above-described process is repeated until all the documents are removed from the document tray 1 as described above.

B. (Double-sided mode) In the case of copying two sheets on both sides of the original The flowchart in FIG. 6 shows the controller 82 in the duplex mode.
0 control procedure is shown. When duplex mode is specified, first,
As in single-sided mode, the lowest document on document tray 1 (
After performing the separation process described above (step S51, see figure 7) and paper feeding process (step S52, see figure 8), the following Step S53 of performing reversal processing to copy the page ■ to
12, the belt drive motor 12 is turned on in reverse in order to drive the entire belt 1lf- and transport the document on the platen glass 101 from the sheet bus II+ to the sheet bus IV (step 54).
10).

As a result, the original is transferred to the large reversing roller 16 and the small reversing roller 1.
7, moves upward along the sheet path V along the rotation of the large reversing roller 16, and after the paper feed sensors 8a and 8b detect the leading edge of the document (step S402), the reversing loop counter is activated. After starting up (step S 403), after this counter finishes counting (step S 404),
Turn off the belt drive motor 12 (step 5405)
), thereby forming a loop for correcting the skew as in the separation process and waiting (see Figure 14 (B)).
.

When the above-mentioned reversing process is completed, next, paper feeding process is performed in the same way as in the single-sided mode (step 554), and C0PY
When the request signal is turned on (Step 555), and the document feed fA (No. 3) from the CPt 1801 of the copying apparatus main body 100 is set (Step 556), the C0PY request signal is turned off (Step 5S7).

Next, in order to copy the page ■, the above-mentioned reversing process is performed (step 5Sa), paper feeding process is performed (step 559), and the C0PY request signal is turned on (step 360). If the next document is detected by determining the output state of the entrance document sensor 3,
Step 561), the process advances to step S62, waits for the document feed signal to be set from the CPU 801 of the copying apparatus main body 100, and turns off the C0PY request signal.Step 563
), step 56 interrupts and starts the above-mentioned paper ejection process 2.
4).

Further, the ejected document is placed at the predetermined position described above (Fig. 14 (E).
)) and the start permission flag is set (step 565), the tel start permission flag is reset (step 56B), and the process returns to step S51 described above to process the next document. Start. Thereafter, the above-described processing procedure is repeated until there are no originals left on the original loading tray l, that is, until the artificial original sensor 3 no longer detects any originals in step S61, and the inlet original sensor 61 detects no originals in step S61. If not, proceed to step S87 and turn off the document detection signal.
Waits for the document discharge signal to be set from the CPU 801 of the copying apparatus main body 100 (step 368), turns off the GOI'Y request signal (step 567), starts the aforementioned paper discharge process 2, and ends (step 570). ),.

By performing the above-mentioned operations one after another for each stack of originals on the document tray 1, the same pages as the originals set on the tray L of the ΔDF 200 are placed on the output tray T of the copying device 100. Single-sided or double-sided copies are obtained.

[Effects of the Invention] As described above, according to the present invention, in a document transport device that transports a document to a predetermined image reading position on the platen of an image reading device and stops, the original fpi transport port is connected to the platen. A predetermined image reading position (first position) is provided in the vicinity upstream of the predetermined image reading position, and after the first original is conveyed and stopped at the predetermined image reading position, a second original is placed adjacent to the predetermined image reading position. The document is transported to a standby position (second position) that is not on the platen, and is then transported to a standby position (second position) that is not on the platen, and then the first original that has been scanned is transported to a predetermined position on the platen that is a position where the transport means can transport the original. At the same time as the document is conveyed to the downstream position (third position) adjacent to the image reading position, the second document is conveyed to the predetermined image reading position and stopped, and this procedure is repeated for the third and subsequent documents. As a result, it is possible to obtain the effect that the loss in document exchange time is not caused by IE 'B' depending on the size of the document, and is always minimized. Further, according to the present invention, there is also an advantage that the time for exchanging originals is shortened without increasing the transporting speed of originals, and the image forming speed is increased.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing the overall configuration of an image forming apparatus to which the present invention is applied; FIG. 2 is a schematic diagram showing the configuration of the document conveying device of the embodiment shown in FIG. 1; FIG. 3 is the same as that shown in FIG. Example of coating mechanism (operation panel)
Fig. 4 - One glaze is a block diagram showing the circuit configuration of the control system of the embodiment of Fig. 1. Fig. 5 shows the control procedure in single-sided mode of the embodiment of the present invention. Flowchart, FIG. 6 is a flowchart showing the control procedure in the double-sided mode of the embodiment of the present invention, FIGS. 7 to 12 are flowcharts showing the subroutine in the control procedure of FIG. 8) to (F) are usage diagrams showing the document conveyance state and positional relationship in the single-sided mode of the embodiment of the present invention, and Figures 14 (^) to (F) are usage diagrams of the two-sided mode of the embodiment of the present invention. FIG. 4 is a usage diagram showing the conveyance state and positional relationship of a document in the mode. DESCRIPTION OF SYMBOLS 1... Loading tray (loading table), 2... Document, 3a, 3b... Entrance document sensor, 6... Separation roller, 7... Min S drive motor, 8a, 8b... Feeding Paper sensor, 9a, 9b...Feed roller, 10a, 10b---o-ra, 12-...Belt drive motor, 13...Electromagnetic brake, 15-...Belt crotter interactor, 16...・Reversing large roller, 17... Reversing roller, 19... Paper discharge sensor, 21... Paper discharge drive motor, 23... Cedar ■, Mr. clock interrupter, 100...
・Image forming apparatus main body, 101...Original table glass (platen glass), 115
...Optical system motor, 117... Home position sensor, 121... Image tip sensor, 133... Main motor, 135... High pressure unit, 137... Blank exposure unit, 155.157... - Paper feed roller, 159... Registration roller, 200... Document feeder (ADF), 600... Key group, 700... Display group, 801... CPLI of main body. 820...80F controller.

Claims (1)

[Scope of Claims] 1) In a document conveyance device that conveys the document one sheet at a time through a document conveyance port to a predetermined position on a platen of an image reading device where image reading scanning is performed and then stops the document, the document is transported to the predetermined position. A conveyance means for stopping the conveyance, and a control means for driving and controlling the conveyance means, wherein the conveyance means and the control means stop conveying the first document at the predetermined position, and subsequently stop the conveyance of the second document. Transporting and stopping the document at a position upstream adjacent to the predetermined position that is not on the platen, and then transporting the first document, which has undergone image reading processing, to a position where the transport means can transport the document and at the predetermined position. At the same time, the second document is conveyed to a downstream position on the platen adjacent to the platen, and conveyance is stopped at the predetermined position, and this procedure is repeated for the third and subsequent documents to sequentially stop conveyance. Characteristic document transport device.