JPH02146069A - Copying device - Google Patents

Abstract

PURPOSE:To take a copy without fail even when a large-sized original is sent unexpectedly by resetting an original stop position and the scanning distance of an exposing optical system for the maximum original size when the supplied original is judged to be large-sized. CONSTITUTION:A sensor 11 is provided on a document feeding passage from an original feeding base 15 to a transparent original platen 8, and an original size is discriminated by the time after the sensor 11 detects the leading edge of the original until it detects the trailing edge of the original. The width of the original is discriminated by the turning on / off of a sensor 21 arranged in the prescribed place. When the detected original size is larger than the original size having been set already, the current original stop position and the current scanning distance of an exposing optical system are altered to those in response to the maximum original size. Therefore, when the large-sized original is fed, the occurrence of defective copies can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a copying machine equipped with an automatic document feeder, so-called ADF.

The conventional ADF described above automatically transports a document placed on the document feeder to a transparent document table, which is generally made of transparent glass, and then moves the document to a predetermined position on the transparent document table. The document is stopped when it reaches the point. An original stopped at a predetermined position on a transparent original table is scanned and its image is read by an exposure optical system disposed below the transparent original table.

In this type of copying apparatus, it is desired to shorten the scanning time of the exposure optical system in order to achieve high-speed copying. As a means to achieve this requirement, the document stopping position on the transparent document table and the scanning distance of the exposure optical system are
A method is known in which the setting is made according to the size of the document transported by F.

According to this method, if the document size is small, the scanning time of the exposure optical system is shortened. however.

If for some reason an original larger than the originally set original size is sent to the transparent platen, the yK original stop position and the scanning distance of the exposure optical system will be changed to Cera 1 to match the original small size original. . . . , there was a problem that part of the image was missing in the reproduced product.

In view of the above points, the present invention achieves high-speed copying by changing the scanning distance of the exposure optical system according to the original size, and also achieves high-speed copying even when large-sized originals are transported. It is an object of the present invention to provide a copying apparatus that does not generate defective copy products in which a part of one image is missing.

- to solve the lesson The above object is achieved by the following copying apparatus.

In other words, the original placed on the original feeding table is automatically sent to the transparent original table, and then the original is stopped at a predetermined original stopping position on the transparent original table, and in that state, the original is exposed. A copying apparatus that scans an image of a document by scanning an optical system, and sets the document stop position and the scanning distance of the exposure optical system according to the size of the document sent onto the transparent document table, It has an original size detection means for detecting the size of the original sent from the original feeding table, and the original size detected by the original size detection means is set at an already set original stopping position and scanning of the exposure optical system. A copying apparatus characterized in that when the document size is larger than the reference document size, the document stopping position and the scanning distance of the exposure optical system are changed to the document stopping position and the scanning distance of the exposing optical system according to the maximum document size. be.

In addition, if the original size detected by the original size detection means is larger than the original size that is the reference for the already set original stopping position and the scanning distance of the exposure optical system, the original is not stopped at the original stopping position and is moved outside. This is a copying device characterized by ejecting data to a.

In a copying machine that changes the document stopping position on the transparent document table and the scanning distance by the exposure optical system depending on the document size, there is a problem when the document size is set to a small size. If a large-sized original is sent onto the transparent platen for some reason, the large-sized original image will be copied onto small-sized copy paper, which may cause a problem in which part of the image cannot be reproduced. There is.

In the first invention of the present application, the size of the original is detected by the original size detection means, and when it is determined that the fed original is a large-sized original as a result of the detection, the original stopping position and the scanning of the exposure optical system are determined. The distance is reset to correspond to the maximum original size. As a result, even if a large-sized original is suddenly fed, the image of the large-sized original can be accurately copied.

Further, in the second invention of the present application, when it is determined that a large-sized original has been fed, the original is ejected to the outside without stopping. This prevents the document from being insufficiently copied.

The document size detection means can be configured as follows. A sensor (11) is placed in the document transport path from the document feed table (15) to the transparent document table (8), and after the sensor (11) detects the leading edge of the document, it detects the trailing edge of the document. Determine the document size from the time it takes to finish. Further, the width size of the document can be determined by whether a sensor (24) placed at a predetermined position is turned on or turned off.

The number of different document stopping positions to be set can be freely determined as necessary. Small size stopping position (b) and large size stopping position! It may be divided into two ways as shown in (a), or it may be divided into more stages.

disaster moxibustion Hereinafter, the present invention will be explained based on Examples.

FIG. 1 is a side sectional view of one embodiment. The illustrated embodiment is broadly divided into a copying machine main body 31 and an automatic document feeder (ADF) 32 disposed above the copying machine main body 31.

FIG. 2 is an enlarged view showing the ADF 32 in detail.

The transparent document table 8 is fixedly arranged on the upper part of the copying machine main body 31 and is not an element constituting the ADF 32, but is shown for convenience of explanation. In FIG. 2, ten bundles of originals are set on the original feeding table 15 with the earliest pages facing down and the image surface facing down. The set document bundle is detected by a set sensor 16 disposed below the document feeding table 15. A calling roller 2 is arranged above the document bundle.

As shown in FIG. 3, the calling roller 2 is rotatably supported at the tip of a bracket 34 fixed on a calling shaft 33. In addition, the calling roller 2 is connected to a timing belt 35.
It is drivingly connected to a paper feed shaft 36 which is rotationally driven by a paper feed motor M1. A calling solenoid 18 is connected to one end of the calling shaft 33.

A stop pawl 37 located below the calling roller 2.
37 is fixed on a stop shaft 38, and a claw release solenoid 19 is connected to one end of the stop shaft 38.6 After the original 1 is set on the original feeding table 15, a copy start key (not shown) is pressed. When pressed, the call solenoid 18
is turned on, the calling shaft 33 rotates by an appropriate angle, and the bracket 34 rotates downward to rotate the calling roller 2.
．． 2 descends to the upper east side of the manuscript. Further, the pawl release solenoid 19 is turned ON, and the stop shaft 38 is rotated by an appropriate angle, whereby the stop pawl 37 is rotated downward and placed in a position that allows the document to advance.

Next, the paper feed motor M1 is turned on and the paper feed shaft 36 starts rotating, which causes the upper separation roller 3a to move in the document transport direction (
(clockwise in Fig. 2). At the same time, the calling roller 2.2 also rotates in the document conveying direction (clockwise in FIG. 2) via the timing belt 35. Calling roller 2.2
By the rotation of the upper separating roller 3a, the uppermost one of the bundle of documents is conveyed toward the pull-out roller 4 shown in FIG. As shown in FIG. 4, the outer peripheries of the upper separation roller 3a and the upper separation roller 3b bite into each other at different levels. Further, the upper separation roller 3b rotates little by little in the opposite direction (clockwise in FIG. 2) with respect to the document conveyance direction while the paper feed motor M1 is on. Even if multiple originals enter between the upper and lower separation rollers 3a and 3b, the upper separation roller 3b will cause the second and subsequent originals to be fed backwards in the opposite direction to the original transport direction, thereby preventing double feeding of originals. Therefore, only the topmost document is sent to the pull-out roller 4.

Incidentally, the rotation shaft 39 of the upper separation roller 3b is supported by an adjustment plate 40, as shown in FIG. The adjustment plate 40 is rotatable about a fulcrum 41, and eccentric cams 42 are fitted to the four upper ends thereof. Eccentric cam 42
The center 111143 of is fixed to a lever 45 that swings under the action of the separation roller release solenoid 22 and a spring 44. When the separation roller release solenoid 22 is turned ON at a proper time, the camshaft 43 rotates by an appropriate angle, and the eccentric cam 42 also rotates by the same angle. Then, the adjustment plate 40 is rotated at an appropriate angle, and the roller shaft 39 and the upper separation roller 3b attached thereto are moved downward. This widens the distance between the upper and lower separation rollers 3a and 3b, and it is possible to minimize the surface of the rollers from being soiled by the original.

As shown schematically in FIG.
(clockwise in the figure). The clutch 21 is
For example, it is formed by a so-called spring clutch, which transmits rotation when the resistor solenoid 20 is turned on, and does not transmit rotation when the solenoid is turned off. The conveyance motor M2 has a belt 5.
The drive roller 6 for rotating the roller is also rotated.

When the register solenoid 20 is turned on while the transport motor M2 is moving, the pull-out roller 4 rotates.

As a result, the document that has already been sent to the pull-out roller 4 is further sent to the belt 5. Thereafter, the document is carried by the rotating belt 5 to a predetermined stopping position (details will be described later) on the transparent document table 8. When the fM document is conveyed to its stop position, the rotation of the bells 1-5 stops and the document also stops.

In FIG. 1, an exposure optical system 46 is located below the transparent document table 8.
is located. This exposure optical system 46 includes a mirror m1
, m2, m3, m4, a lens 1, and a lamp 1p. As is well known, these lamps 1p, etc.
A document stopped on a transparent document table 8 is scanned, and a light image of the document image is irradiated onto a drum-shaped photoreceptor 47. lamp ip
In the example, the scanning distance for exposing the original according to
The long distance from the first device a to the return position C (scanning distance when copying originals exceeding A4 size and up to A3 size) and the short distance from the second device @b to the return position C (A
Two types are set: (scanning distance when copying an original when the distance is 4 or less). aS and bs are standby positions of the lamp lp, etc. for the first device a and the second position, respectively.

That is, the exposure optical system 46 starts exposure after the run-up section indicated by A. Whether to select the long scanning distance or the short scanning distance is determined by the ADF controller 13, and will be described in detail later.

When the light image of the image is irradiated onto the photoreceptor 47 by the exposure optical system 46, an electrostatic latent image corresponding to the image is formed on the photoreceptor 47. This electrostatic latent image becomes a visible image (toner image) with toner supplied from the developing device 48. When the scanning of the document by the exposure optical system 46 is completed, the belt 5 is restarted, and the document is discharged onto the document receiver 10 by the discharge roller 9. This document receiver 10 utilizes a convex portion provided on a cover 14 that covers the entire ADF 32.

The copying machine main body 31 has three paper feed trays 49A, 49B, 49.
G is provided, and the copy paper sent out from the paper feed tray is conveyed to the photoreceptor 47 at any time. This copy paper is superimposed on the toner image on the photoreceptor 47, and then sent to the discharge area of the transfer charger 5o. Transfer charger 5
The toner image is transferred onto the photoreceptor 47 by the action of the discharge.

Thereafter, the copy paper is separated from the photoreceptor 47, subjected to a toner image fixing process by a fixing attachment 51, and then to a sorter 5.
It is discharged to 2.

The overall operation of the copying machine is as described above, but below:
Document conveyance by the ADF 32 will be explained.

As described above, document conveyance control is executed by the ADF controller 13 shown in FIG. For control, it is necessary to detect the conveyance status of the document, but for this purpose,
A set sensor 16 is placed under the document feeding table 15, and a tip sensor 17 is placed between the upper separation roller 3a and the pull-out roller.
A register sensor 11 is disposed downstream of the pull-out roller 4, and a discharge sensor 12 is disposed upstream of the discharge roller 9. Furthermore, a size sensor 24 is disposed on the back side of the tip sensor 17, as shown in FIG. This size sensor 24 is for detecting the size of the document being conveyed, and is for A5 (vertical) as shown in FIG.
It is placed at a position that is outside the size and corresponds to the inside of the BS (vertical) size. In Fig. 2, the transport motor M
An encoder 23 is attached to 2.

FIG. 8 is a block diagram of the main parts of the internal circuit of the ADF controller 13. The various input/output devices connected to the CPU 53 have already been mentioned in the explanation so far, and are given the same reference numerals.

Figures 9 to 14 (Figure 11 also includes Figures 11a to 11)
It is divided into Figure i, and Figure 14 is further divided into Figures 14a and 14b. ) is ADF controller 1
3 is a flowchart representing the control executed by the CPU 53 of No. 3.

Figure 9 shows the main flow. The M2 (transport motor) stop control routine is a so-called external interrupt routine, and in FIG. 8, interrupts the main flow every time a pulse from the encoder 23 is input to the external interrupt terminal 1NTl of the CPU 53.

Each subroutine will be explained below.

CPU initial set Initializes the CPU 53. For example, set each port to an input port or an output port.

Input Port Check Checks the status of each sensor connected to the I/O interface 54 in FIG. For example, check whether the set sensor 16 is turned on or turned off.

11 cover OUT In FIG. 8, motors Ml, M2. M, 3. And an ON signal or an OFF signal is output to the boat (output port) to which the solenoids 18, 19, 20, and 22 are connected. For example, when the feed motor M1 is turned ON in another subroutine, instead of outputting an ON signal in that subroutine, this output port OUT routine outputs an ON signal.
Outputs N signal. The same applies not only to the word feeding motor M1 but also to the ○N/○FF signals of all loads.

Paper feed check (Figure 10) Is it in ADF mode (automatic document feeding mode)?
Check whether the mode is F mode (semi-automatic feeding mode: a mode in which originals are placed one sheet at a time on the original feeding table 15 and automatically fed) or another mode. These modes are selected by operator key operations. In either the ADF or 5ADF mode, a set sensor 16 checks whether the document is set on the document feed table 15 or not. If it is set, check whether the document feed signal is coming from the copying machine main body. If so, the calling solenoid 18 is turned on to press the calling rollers 2, 2 against the surface of the document 1, and the pawl release solenoid 19 is turned on to retract the stop pawls 37 and 37 from the R document conveyance path. Also, job counter (hereinafter referred to as J
OBG) is set to "1", and the timer STTiM is set to "1".
Initialize.

Document Feeding (FIGS. 11, 11a to 11i) This is a routine from feeding the document 1 from the document feeding table 15 to passing the register sensor 11 in FIG.

As mentioned above, JOBC is a job counter.

The subroutine corresponding to the count value of the counter contents is processed. For example, when the count value of JOBC is "2", J
The OB2 subroutine is processed. Normally, JOBC is set to 1 in the document feed check routine (Figure 10), so JOB8 is set in order from JOBl (Figure 11b).
(Fig. 11i) are processed in sequence. The reference values x1 to x7, which are compared with the contents of the timer STTiM in each of these routines, are values set in advance in the CPU.

In JOB5 (Figure 11f), counter M2TP
C is initialized, and this is a counter that counts pulses from the encoder 23 (FIG. 2) attached to the transport motor M2. The timing of stopping the document on the transparent document table 8 is determined by the count value of this counter. Further, the document size (transport direction) is determined by the count value of the counter M2TPC while the document is being detected by the register sensor 11.

In JOBG (Fig. 11g), the size sensor flag f
S i Z S N F is initialized. This SiZ
SNF indicates that the size sensor 24 (Fig. 6, Fig. 7) is ON.
It becomes "1 (set)" when the sensor is OFF, and becomes "O (reset)" when the sensor is OFF. As mentioned above, the size of the document in the conveyance direction is determined by turning the register sensor 11 on and off.
For example, A4 (horizontal) and A5 (vertical) have the same length in the transport direction, so they cannot be distinguished by the number of pulses.

At this time, whether the size sensor 24 is ON or O
It is checked whether it is FF, and if it is ON, it is determined that it is A4 (horizontal), while if it is OFF, it is determined that it is A5 (vertical). B5 (horizontal) and B6 (vertical) are similarly determined (
For details, refer to the size determination routine in FIG. 13. ) In JOB8 (FIG. 11i), when the original 1 passes the register sensor 11 and the register sensor 11 is turned off, the size end flag 5iZEF is set to "1".

Size data only 5iZ in JOB8 (Figure 11i) of the document feeding routine in Figure 12
When EF is set to "1", size read counter S i ZRDC is set to the count value of counter M2TPC, and size read flag 5iZRDF is set to "1".
and 5iZEF is reset.

Size control Figure 13 When the size read flag S i ZRDF is set to "1", the document size is determined based on the contents of the size read counter 5i ZRDC and whether the size sensor flag S i ZSNF is "1" or "0". be done.

Check whether external interrupt flag 1NTIF is "1". 1NTIF is set to "1" when a pulse is input to the 1NT1 terminal of the CPU 53.

If 1NTIF=1, the original half stop flag H
8 Check whether TPF is "1". As described above, the document size is determined by the size determination routine (FIG. 13), and the determined document size data is transmitted from the CPU 53 to the CPU (not shown) of the main body of the copying machine. Based on the transmitted original size data, the main body CPU sets the original stopping position on the transparent original platen 8 to the large-sized original stopping position where the leading edge of the original matches the first device a (FIG. 1). It is determined whether to move the document to the small size document stop position where the leading edge of the document matches the second position, and sends the result to the CPU 53.

When a signal indicating that the original stopping position should be changed to the small size original stopping position (b) is sent from the main body CPU to the CPU 53, the CPU
U53 sets H8TPF to "1".

That is, in FIG. 14, when H8TPF=1 (small size), the flow enters the routine selected by i NT I CU, while when H3TPF≠1 (large size)
When , the flow enters the routine selected by 1NT2CU. Both 1NT1cU and 1NT2CU are interrupt counters, and JOBC (11th
Similarly to the example shown in the figure), the subroutine for the contents of the counter is processed.

(When copying large size originals) H3TPF≠1 and enters 1NT21. As shown in FIG. 14b, in i NT 21, the transport motor M2
Count the pulses generated from and add 1 to the contents of M2TPC. Then, it is determined whether the content of M2TPC has become larger than xll (a preset document feed amount, which in the case of the embodiment is a value equivalent to the time the document passes through the register sensor 11). If it is larger, z3 is set in the counter NXTTPC.

Here, Z3 is data for transporting the original to the large size stop position (a).

In subroutine i NT 22, the contents of NXTTPC set in 1NT21 are subtracted. In this routine, subtraction is performed when a pulse is input to the 1NT1 terminal in FIG. Next, it is determined whether the content of NXTTPC is less than or equal to O, and if it is less than or equal to O, "3" is added to 1NT2CU.

In subroutine 1NT23, transport motor M2 turns O.
FF and the original is placed at the large size position (a) on the transparent document table 8.
) to stop.

(When copying a small size original) H8TPF becomes 1 and enters 1NT11 (Fig. 14a). Count the pulses generated from the transport motor M2 and add 1 to the contents of M2TPC.

Then, it is determined whether the contents of M2TPC have become larger than xlo, and if so, the counter NXT
Set Zl to TPC. Here, Zl is data for transporting the original to the small size stop position (b).

In subroutine 12, each time a pulse is input to the iNT terminal of the CPU 53, the NX
Subtract the contents of TTPC. When the content of NXTTPC is less than or equal to O, that is, when the document is conveyed to the small size stop position, subroutine 1NT13 is entered.

iNT 13 first checks the status of the register sensor 11, and if it is ON, the document is A4 (landscape).
, and sets NXTTPC to Z2. This z2 is data for transporting the document from the small size stop position to the large size stop position a. After that, until it enters 1NT14 and becomes NXTTPC=O,
That is, the original is further conveyed until it reaches the large size stop position a.

In other words, even if the original stopping position is initially set to the small-sized original stopping position, the original
If the original sent from 5 is larger than the small size original (in the case of the example, the size is larger than A4 (horizontal)), change the original stop position from b (small size) to a (large size). size). Of course, at this time,
The exposure scanning range of the exposure optical system 46 in FIG.
However, the distance is changed to lower.

Thereafter, the H8TPF is reset, and from then on, copying is performed using the small-sized document stopping position a as a reference. Information indicating that the document stopping position has been changed from b to a is sent to the copying machine main body.

In 1NT13, when the register sensor 11 is OFF, it means that the original is small in size.
1NT15, the conveyance motor 2 is stopped, and the document is stopped at the small size stop position.

As described above, if a large-sized original is sent for some reason when copying a small-sized original, the original stop position is automatically changed to the small-sized stop position, and the large-sized stop position image is transferred to the small-sized copy paper. This eliminates the problem of parts of the image being missing when making copies.

15 to 17 and 17a to 17c show other examples of control regarding document conveyance.

FIG. 15 is a subroutine of the M2 stop control routine shown in FIG. 14, and is particularly used in place of the routine in FIG. 14a. FIG. 17 shows a document discharge routine also shown in FIG. 9, and FIGS. 17a to 17c show subroutines of the document discharge routine. 16th
The figure shows a discharge check routine that is performed prior to the original paper sheet routine.

In the above-described embodiment, if a large-sized original is sent out by mistake for some reason while copying a small-sized original, the original stopping position changes from b (small size) to a (large size). This eliminates the inconvenience of producing a defective copy product in which part of the image is missing.

In contrast, in this embodiment, when the document is conveyed to the small size stop position at 1NT12 in FIG.
TTPC<O), in subroutine 1NT13, it is checked whether the register sensor 11 is turned on, and when it is turned on, that is, the document is A4 (horizontal).
When the value is larger than , the document discharge flag FEDOUTF is set to 1. When FEDOUTF becomes 1, the 16th
As shown in the figure, M2 and M3 are turned on, and the document is ejected to the document receiver 1o without stopping at the stop position.

Therefore, no copying process is performed on this large-sized original, so that there is no problem such as a part of the image of the large-sized original being erroneously copied onto a small-sized copy sheet.

In FIG. 16, the paper ejection job counter EXJOBG is 1.
When set to , the EXJOB 1 routine is selected in FIG. As shown in Figure 17b, EX
In JOBI, it is checked whether the paper ejection timer EXTiM is greater than Yl. Yl means that the document is placed in the document tray 10 after the register sensor 11 is turned on.
This data corresponds to the time until it begins to be discharged.

Therefore, in EXJOBI, the paper ejection sensor 9 is turned off.
If ExTiM>Yl, it is determined that a jam has occurred within the ADF 32, and the discharge jam flag is set to 1.

Paper ejection job counter EXJOBC in EXJOBI
is set to 2, the EXJOB 2 routine (first
7c). In this routine, the paper ejection sensor 9 is
When it becomes N, it is checked whether or not the paper ejection timer EXTiM is Y2. Y2 is data corresponding to the time from when the document discharge sensor 9 is turned on until the document is completely discharged to the document receiver 10. Therefore, if EXTiM becomes Y2 while the paper ejection sensor 9 remains ON,
It determines that a jam has occurred and sets the output jam flag.
Sera 1 to 1.

Although not specifically shown, when the output jam flag is set to 1, the jam display on the copier operation panel,
Measures will be taken such as temporarily suspending the copying process.

According to the invention of claim 1, when a large-sized original is fed while the small-sized original copy mode is being executed, the stopping position of the original on the transparent original platen is automatically adjusted. Since the position is changed to the large size stop position, a copying error such as a part of the image not being reproduced does not occur.

According to the invention of claim 2, instead of changing the stopping position of the original to the human-sized stopping position, the original is ejected outside without stopping, so that it is possible to prevent a dog-sized original from being accidentally transferred to a small-sized paper. Copying is prevented.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of one embodiment, FIG. 2 is a side sectional view of the automatic document feeder ADF in FIG. 1, FIG. 3 is a perspective view of the main part of FIG. 2, and FIG. FIG. 5 is a front view of the main parts in Fig. 3, Fig. 5 is a perspective view of other main parts in Fig. 2, Fig. 6 is a perspective view of still another main part, and Fig. 7 is a view of Fig. 6 from above. FIG. 8 is a block diagram of an example of the control circuit of the ADF shown in FIG. 2, FIGS. 9 to 17 are flowcharts of the control executed by the control circuit, and FIG. 11a is a schematic diagram corresponding to the case where from 1st
Figure 1i is a diagram showing each subroutine in the flowchart shown in Figure 11, and Figures 14a and 14b are
FIGS. 17a to 17c are diagrams showing each subroutine in the flowchart shown in FIG. 4, and FIGS. 17a to 17c are diagrams showing each subroutine in the flowchart shown in FIG. 15... Original feeding table 1... Original 8... Transparent original plates a, b... Original stopping position 46... Exposure optical system 11... Register sensor (original size detection means) first
Figure 1b Figure 11c Figure J7a Figure 17c

Claims (2)

[Claims] (1) The document placed on the document feeder is automatically sent to the transparent document tray, and then the document is stopped at a predetermined document stop position on the transparent document tray, and the document is placed in that state. A copying apparatus that scans an image of a document by scanning an exposure optical system, and sets the document stop position and the scanning distance of the exposure optical system according to the size of the document sent onto the transparent document table. , comprising a document size detection means for detecting the size of the document fed out from the document feeding table;
If the original size detected by the original size detection means is larger than the original size that is the reference for the already set original stopping position and the scanning distance of the exposure optical system, the original stopping position and the scanning distance of the exposing optical system are changed. A copying apparatus characterized by changing a document stopping position and a scanning distance of an exposure optical system according to a maximum document size. (2) The document placed on the document feeder is automatically sent to the transparent document tray, and then the document is stopped at a predetermined document stop position on the transparent document tray, and the document is placed in that state. A copying apparatus that scans an image of a document by scanning an exposure optical system, and sets the document stop position and the scanning distance of the exposure optical system according to the size of the document sent onto the transparent document table. , comprising a document size detection means for detecting the size of the document fed out from the document feeding table;
If the original size detected by the original size detection means is larger than the original size that is the reference for the already set original stopping position and the scanning distance of the exposure optical system, the original is moved outside without stopping at the original stopping position. A copying device characterized by ejecting.