JPH0519575A - Electrophotographic copying machine provided with automatic form selecting function - Google Patents

Abstract

PURPOSE:To provide an electrophotographic copying machine preventing erroneous copying which occurs when a copying magnification is finely adjusted, on the electrophotographic copying machine whose automatic form selecting function is operated. CONSTITUTION:The electrophotographic copying machine is provided with a mode specifying means specifying an automatic form selecting mode, a copying magnification setting means setting the copying magnification, a magnification finely adjusting means finely adjusting the set copying magnification in a prescribed unit, and the automatic form selecting means detecting the size of an original when the automatic form selecting mode is specified by the mode specifying means, selecting a proper copying paper size, from the detected original size and the present set copying magnification, and executing the copying on the relevant size copying paper. When the copying magnification is finely adjusted by the magnification finely adjusting means after the automatic form selecting mode is selected and the copying is executed in this mode, the copying paper size selected when the copying is executed is maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic copying machine having an automatic paper selection (hereinafter simply referred to as "APS") function and a copy magnification fine adjustment function.

[0002]

2. Description of the Related Art Conventionally, in electrophotographic copying machines, AP
There is known one having an S function and a function capable of finely adjusting a set copy magnification. The APS function is a function of detecting the size of an inserted document and automatically selecting a predetermined copy sheet corresponding to the copy magnification to perform copying.
Further, the magnification fine adjustment function can be performed, for example, by operating the copy magnification up / down key for the copy magnification once copied.
This function allows you to make fine adjustments and perform copying at the finely adjusted copy magnification.

[0003]

For example, a user
In the PS mode, when an A3 size original is set on the platen and the A3 → A4 fixed magnification select button is pressed,
The copy magnification is set to x0.707. If you press the print button here, the APS function will work, and based on the original size (A3) and the set copy magnification (× 0.707), you can select the desired A4 size based on the APS table (Table 1). Copy paper is selected, and copying is performed thereafter. After copying, if the user who looks at the copy status finely adjusts the copy magnification and the copy magnification increases by × 0.01 to × 0.717, the APS function is optimal for the initial copy. However, after the magnification adjustment, the APS is performed on the changed copy magnification (× 0.717), and the B4 copy paper different from the original is selected (see Table 1). If the user selects an undesired B4 copy sheet and makes a copy, the user must cancel the APS function, manually select an A4 size copy sheet, and make a copy again, resulting in a miscopy. .. An object of the present invention is to prevent the above miscopy in an electrophotographic copying machine in which the APS function is operating.

[Table 1]

[0004]

According to the present invention, there is provided a mode designation means for designating an APS mode, a copy magnification setting means for setting a copy magnification, and a fine magnification adjustment for finely adjusting the set copy magnification in a predetermined unit. Means and the APS mode is designated by the mode designating means, the size of the document is detected, and an appropriate copy paper size is selected from the detected document size and the currently set copy magnification, and When the copy magnification is finely adjusted by the magnification fine adjustment means after the APS mode is designated and the copy is performed in this mode, the APS means is provided. An electrophotographic copying machine having a function characterized in that the selected copy paper size is maintained when copying is performed.

[0005]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The examples will be described in the following order. (a) Copying machine configuration (b) Operation panel (c) Copying machine control section configuration (d) Copying machine operation <d-1> Main routine <d-2> Magnification selection subroutine <d-3> Key processing subroutine <d-4> Magnification up / down key processing subroutine <d-5> Paper paper selection subroutine <d-6> Copy operation subroutine (e) Another embodiment of the present invention

(A) Construction of Copying Machine FIG. 1 is a schematic sectional view of an electrophotographic copying machine according to the present invention. This electrophotographic copying machine comprises a copying machine main body 1, a table 32 on which the copying machine main body is placed, an optional automatic document feeder (ADF) 300, and a three-stage paper feeding unit 1000. The copying mechanism of the copying machine body 1 is similar to that of a conventional electrophotographic copying machine. A detector K1 for detecting the size of the original sheet is arranged on the upper part of the copying machine main body 1. The detector K1 detects the original size data at the time of copying and communicates it to the CPU1. A photoconductor drum 2 that can be driven to rotate counterclockwise is disposed in the center of the copying machine body 1. Around the photoconductor drum 2, a main eraser lamp 3, a sub-charger 4, and a sub-eraser are provided. A lamp 5, a main charging charger 6, a developing device 7, a transfer charger 8, a transfer paper separating charger 9, a blade type cleaner device 10, and the like are sequentially arranged.
The photoconductor drum 2 is a drum provided with a photoconductor (for example, selenium) on the surface thereof, and the eraser lamp 3,
It is irradiated with light at 5 and charged by passing through the chargers 4 and 6 and then subjected to image exposure from the optical system described below. The motor M1 drives the photosensitive drum 2 and the like. A color toner detection sensor 411 is attached above the developing device 7.

The optical system is installed below the platen glass 11 so as to scan a document image. The optical system is the light source 1
2, first mirror 13, second mirror 14, third mirror 1
5, a projection lens 16, and a fourth mirror 17. The original image is shown on each mirror 13, as indicated by the line 18.
The photosensitive drum 2 is reached through 14, 15, and 17. The fixed position switch SW500 is provided to detect whether the optical system is at a predetermined position during scanning. An automatic exposure sensor 19 is attached above the projection lens 16 and the intensity of the reflected light from the mirror 15 is measured to detect the document density. The magnification is set by moving the projection lens 16 with the motor M4 in the optical axis direction. The motor M3 drives the optical system. When the copying magnification is n, the light source 12 and the first mirror 13 are rotated by the motor M3 (v / v in response to the rotation of the photosensitive drum 2 at the peripheral speed v (constant regardless of equal magnification or variable magnification). n) Moves to the left at the speed of the second mirror 1 at the same time.
The fourth mirror 3 and the third mirror 15 move leftward at a speed of (v / 2n). With this movement, the image is exposed in a slit shape on the photosensitive drum 2 from the fourth mirror 17.

On the left side of the copying machine body 1, the automatic paper feed cassette 20 is installed in the upper paper feed port, the three-stage paper feed unit 1000 is installed in the lower paper feed port, and the manual paper feed unit 21 is installed in the upper part. To be done. The three-stage paper feeding unit 1000 is installed as an option instead of the second automatic paper feeding cassette as a standard equipment set in the lower paper feeding port. Copy paper in the automatic paper feed cassette 20 or the manual paper feed unit 21 is selectively fed by the respective paper feed rollers 22 and 23 to the copying machine main body 1.
It is supplied inside and is conveyed to each timing roller 26 in the pressure-bonded state through each pair of conveying rollers 24, 25, and once there stands by. The paper feed roller 30 is used to feed paper at the lower paper feed port.

At the time of transfer, the copy paper fed by the timing roller 26 comes into close contact with the photosensitive drum 2 at the transfer portion, the toner image is transferred by the corona discharge of the transfer charger 8, and then the corona of the separation charger 9 is transferred. It is separated from the surface of the photoconductor drum 2 by the discharge and the strength of the transfer paper itself. Subsequently, the copy sheet is sucked onto the conveyor belt 27 provided with an air suction unit (not shown),
The belt 27 is conveyed rightward as the belt 27 rotates clockwise. Next, the toner image is fused and fixed by passing through the fixing device 28. Then, it passes through the discharge roller pair 29 and is discharged to the tray 31 outside the copying machine main body 1 or a collating machine (not shown).

Copy paper size detection switches 401-
Microswitches 404 and 405 to 408 are provided in parallel in the upper and lower paper feed ports, respectively, and detect whether the size of the copy paper in the cassette and the paper feed direction are set vertically or horizontally. . Copyable size, that is,
The size of copy paper that can be loaded in each paper feed unit is
[A3], [A4], [A5], [B4], [B5]
Vertical and horizontal can be selected for 4] and [B5]. Further, the switches 401 to 404 and 405 to 408 also detect the attachment / detachment of the cassette, which means that the presence / absence of copy paper at the paper feed port is indirectly detected. The size and setting direction of the copy paper are set by the switch 40.
1 to 404 and 405 to 408 are detected by a 4-bit code corresponding to the combination of ON and OFF, and the control circuit (see FIG.
(Refer to FIG. 3) is stored in the RAM 202 of the CPU 1. Table 2 below shows an example of a code table for the switches 401 to 404. This table 2 shows that the switch is on [0] and off
This is represented as [1], and when all the switches are turned off, it means that the cassette 20 is not mounted in the paper feed unit, that is, the absence of copy paper is detected.

[Table 2]

Of the sensors attached to the copying machine main body 1, the manual feed door detection switch 410 is a manual feed section 21.
It is detected whether or not the manual feed door 21a constituting the above is closed. Bypass door 21a is closed when not in use. The sensors SE1 and SE2 are copy paper detection switches of the manual paper feed unit 21. The display mode changeover switch 412 is used to change over the size display of the copy paper of the LEDs 71a to 74a described later. The front door detection switch 413 is a switch that detects opening / closing of the front door of the copying machine body 1. Automatic exposure center setting switch 4
Reference numerals 14 and 415 are used to set the center of the exposure level during automatic exposure.

The three-stage paper feeding unit 1000 includes a rail 10
40 are movably supported, and cassettes 1010, 1020, and 1030 are provided at the upper, middle, and lower three-stage paper feed ports, respectively.
Can be set. The docking detection switch 1002 detects whether or not the three-stage paper feeding unit 1000 is connected to the copying machine main body 1. Motor M5
Drives the paper feed system of the three-stage paper feed unit 1000. Copy paper size detection switches 1011 to 1014, 1021 to 1024, and 10 shown collectively
Reference numerals 31 to 1034 detect the sizes of the copy sheets at the upper, middle, and lower paper feed ports, respectively, and copy sheet type set switches 1015 and 1016; 1025 and 102.
6; 1035 and 1036 are switches for setting the types of copy paper in the upper, middle, and lower paper feed openings, respectively.
When any one of the corresponding cassettes is selected, the paper feed clutches 1017, 1027, 1037 are connected to the transport rollers 1018, 1028, 1028 corresponding to the selected cassette.
1038 is connected to a drive system to supply copy paper of a designated size to the copying machine main body 1 side.

In the ADF 300, the sensor 310
Detects whether or not a document has been fed, and the sensor 311
Detects whether there is a document on the document tray 304. The motor 301 is an ADF document transport belt 305.
Is rotated, and the motor 302 feeds a document from the document tray 304.

(B) Operation Panel FIG. 2 shows the operation panel. The operation panel is provided with keys indicated by the following reference numbers. Key 40: A print key for starting copying.
Keys 41 to 45: Fixed magnification selection keys of equal magnification, fixed reduction magnification of 2 steps, and fixed enlargement magnification of 2 steps. LEDs 41a-L
ED45a: A fixed magnification display key for displaying the magnification selected by the fixed magnification selection key. Key 46: A magnification down key for decreasing the copy magnification by a predetermined unit. Key 47: A magnification up key for increasing the copy magnification by a predetermined unit. Display 48: A 4-digit display segment for displaying the set copy magnification. Key 50: A magnification unit selection key for selecting a predetermined unit for increasing or decreasing the copy magnification with the magnification up / down keys 46 and 47. LEDs 50a and 50b: magnification unit display LEDs for displaying the set copy magnification increase / decrease rate. L
ED 71a to LED 74a: LEDs that display the size of copy paper used for copying. LEDs 81a-L
ED84a: An LED that displays a paper feed port for copy paper used for copying. Keys 90 to 99: Numeric keys for inputting the number of copies. Key 101: APS (AUTO PA
This is a key to select the PER.SEL) mode and MAS (MANUAL PAPER.SEL) mode. LED101a, LED101
b: LED for displaying the above two copy modes.
102: An MPS key for selecting an arbitrary copy sheet in the MPS mode.

(C) Structure of the control section of the copying machine FIGS. 3 and 4 show a CPU for controlling the copying machine main body 1.
1 shows the input / output configuration of the CPU 1 for controlling the optical system. In FIG. 3, the IC 200 is used as an input / output IC. Various keys shown in FIG. 2 are connected to the input terminal, which are connected to the CPU 1 by a data line, and controlled via the decoder 201. The display 48 and each LED are connected to the output terminal and are controlled by the CPU 1 via the decoder 201. Figure 4
In, the CPU 1 is connected to various parts (A1 to A7, etc.) and controls each. The document size detector K1 and the RAM 202 are connected to the CPU 1, and the RAM 202 is backed up by a battery. CPU2 communicates with CPU1 via the bus. The scan motor M is connected to the input / output port of the CPU2.
Scan motor control circuit 203 for controlling 3
And a variable magnification lens control circuit 204 for controlling a motor M4 for moving the projection lens is connected.

(D) Operation of Copying Machine Main Body The outline of the contents of the program of the CPU 1 for controlling the copying machine main body 1 will be described below.

<D-1> Main routine FIG. 5 shows a schematic flowchart of the CPU 1. CPU
When 1 is reset and the program starts,
First, CPU for clearing RAM, setting various registers, etc.
Initialization 1 and initial setting for setting the apparatus to the initial mode are performed (step S100).

Next, an internal timer which is built in the CPU 1 and whose value is set in advance by initialization is started (step S200). Next, various processes, that is, a process of selecting a copy magnification of fixed magnification (step S30
0), a mode selection key 101 for selecting the APS and MPS modes, a magnification unit selection key 50 for finely adjusting the copy magnification, and processing of each key of the print key 40 for starting copying (step S400), copy Magnification up / down keys 46, 47 for changing and adjusting the magnification
Process (step S500), a process for selecting and feeding a copy sheet to be copied (step S600), a copying operation (step S700), and other processes such as display (step S800). Note that the above step S300
~ S700 will be described later.

When all the subroutine processes are completed, the internal timer set first is awaited (step S900), one routine is completed, and the process returns to step S200. The time length of this one routine is used to count the various timers that appear in the subroutine.
(Various timer values determine the end of the timer depending on how many times this one routine is repeated.)

<D-2> Magnification Select Subroutine FIG. 6 shows a magnification select subroutine S300. Here, when the fixed magnification selection key is pushed, the processing for setting and displaying the corresponding copy magnification is performed.

When one of the fixed magnification selection keys, that is, the key 41 is pushed (step S301), the corresponding fixed magnification display LED 41a is turned on (step S302), the fixed magnification of × 1.154 is selected, and the magnification is set. 4 for display
This is displayed in the digit display segment (display 48) (step S303). Next, the display magnification, that is, the fixed magnification × 1.154 is stored as the APS magnification value (step S
316) and then return.

Fixed magnification selection keys 42, 43, 44
The same processing is performed also when the buttons 45 and 45 are pushed (steps S304 to S315 and 316). If none of the keys has been pushed, it is returned.

<D-3> Key Processing Subroutine FIG. 7 shows the key processing subroutine S400. Here, when the selection key 50 of the magnification unit for adjusting the copy magnification is pushed, the unit for adjusting the copy magnification is changed and displayed, and when the copy mode selection key 101 is pushed, the APS mode is set. When the print key 40 for switching and displaying the MPS mode and starting the copying is pushed, the processing for starting the copying is performed.

When the selection key 50 for each magnification unit for adjusting the set copy magnification is pushed (step S40)
1) If the LED 50a displaying the unit of magnification × 0.003 is lit (step S402), the LED 50a
LED5 that turns off a and displays the magnification unit x 0.005
0b is turned on (step S403). Also, the unit of magnification ×
If the LED 50a displaying 0.003 is turned off and the LED 50b displaying the unit of magnification x 0.005 is turned on (step S404), the LED 50b is turned off,
That is, both LEDs are turned off (step S405).
Or LED50 that displays the unit of magnification x 0.003
When a is off and LED 50b is off, that is, when both LEDs are off, the unit of magnification is × 0.
The LED 50a displaying 003 is turned on (step S
406). Here, when both the LED 50a and the LED 50b are off, the up / down key is used to set the zoom magnification (described later: step S502). However, when the scaling unit selection key 50 is not pushed, the steps S402 to S406 are skipped.

Next, the key 101 for selecting the copy mode
Is pushed (step S407), if the LED 101b indicating the MPS mode is lit (step S408), the LED 101b is turned off and the APS
The LED 101a indicating the mode is turned on (step S409). Also, the LED 101 for displaying the MPS mode
When b is off, LED 101b is turned on and A
The LED 101a displaying the PS mode is turned off (step S410). However, if the copy mode selection key 101 is not pushed, the above step S40 is performed.
8 to S410 are skipped.

Next, when the print key 40 is pushed (step S411), the value 1 is input to the copy flag (step S412), other key processing (step S413) is performed, and then the process returns. However, when the print key 40 is not pushed, the above step S
412 is skipped, and other key processing (step S
After 413), it is returned.

<D-4> Magnification Up / Down Key Processing Subroutine FIGS. 8 and 10 show a magnification up / down key processing subroutine S500. Here, when the user operates the magnification up / down keys 46 and 47 in the mode for adjusting the copy magnification, the copy magnification before the operation is stored as the APS magnification value, and thereafter the adjustment is performed in the same mode. Even in such a case, by holding the value, processing for preventing the problem of miscopying is performed.

In FIG. 8, a copy magnification up key 47
When is pushed (step S501), the unit of magnification is ×
LED50a displaying 0.003 or magnification unit x 0.00
When the LED 50b displaying 005 is lit (step S502) and the flag A is 0, that is, when the copy magnification has not been adjusted since the start of the copy program (step S503), Display 4
The magnification displayed in 8 is stored as an APS magnification parameter (step S504), and 1 is input to the flag A (step S505). When the value of the flag A is not 0, that is, when the copy magnification adjustment adjustment has already been performed once, steps S504 and S505 are skipped and the APS magnification value before the copy magnification adjustment adjustment is held.

Next, L for displaying the unit of magnification × 0.003
If the ED 50a is lit (step S50
6) The copy magnification is increased by x0.003 (step S507), and the result is displayed on the 4-digit display segment (display 48) for magnification display (step S508). Magnification unit ×
When the LED 50b displaying 0.005 is lit, the copy magnification is increased by x 0.005 (step S509) and displayed on the magnification display segment (display 48) (step S510).

On the other hand, in step S502, the LED5
If both 0a and the LED 50b are turned off, the magnification up key 47 functions as a zoom magnification increasing key for increasing the copy magnification by the unit of × 0.001 (step S511), and the copy magnification is displayed in the display segment ( Display 4
8), and the displayed value is memorized as an APS magnification value (step S513).

As a result of the processing in steps S501 to S513, when the copy magnification becomes larger than x2,000 (step S514), the copy magnification is set to x2,000 (step S515) and the process returns. However, if it is determined in step S514 that the magnification is less than or equal to × 2,000, the value is held and the process returns.

FIG. 10 is a flowchart when the magnification down key 46 is pushed (steps S516 to S5).
30) shows steps S522, S524 and S5.
In step 26, the copy magnification is decreased, and that is displayed in the next step, and steps S516 to S528.
As a result, when the copy magnification is less than × 0.500 (step S529), the copy magnification is set to × 0.500 (step S530), and the return is returned thereafter. The same processing as when pushed is performed.

<D-5> Paper Selection Subroutine FIG. 12 shows the paper selection subroutine S600. Here, when the copy mode display LED 101b is lit (step S601), the APS mode (FIG. 13)
Then, an appropriate copy paper is automatically selected, and when it is not lit, the MPS mode (FIG. 14) is entered, and processing is performed so that the user can arbitrarily select the copy paper by the MPS key.

FIG. 13 shows a flow chart of the APS mode (steps S610 to S618). In the APS mode (step S610), the print key 40
Is on (step S611), the detector K1
The document size data detected in (FIG. 1) is read (step S612), the APS magnification value memory is read (step S613), and the APS magnification value is determined from the stored value (step S614). The size of the copy sheet is determined from the APS magnification value based on the APS table (Table 1) (step S615).
Thereafter, it is determined whether or not there is a sheet feed port of the determined size (step S616), and if there is such a sheet feed port, that sheet feed port is selected (step S617). LED 101b for displaying MPS mode
Is turned on (step S618). However, step S
When the print key 40 is not pushed in 611, the processes of steps S612 to S618 are skipped.

FIG. 15 shows a flow chart of the MPS mode (steps S620 to S632). In the MPS mode (step S620), the MPS key 102
Is pushed (step S621), and the paper feed port display LED 81a is lit (step S62).
2) Turn off the paper feed port display LED 81a and display the paper feed port L
The ED 82a is turned on (step S623). Next, one of the sheet size display LEDs 71a to 74a corresponding to each sheet feed port display LED is turned on (step S62).
4) and then return.

Paper feed port display LEDs 82a, 83a and 84
Similar processing is performed when a is lit (steps S625 to S632). However, if the MPS key 102 is not pushed in step S621, the processing in steps S622 to S632 is skipped and the copy paper is not changed.

<D-6> Copying Operation Subroutine FIG. 16 shows the copying operation subroutine S700. Here, when the value of the copy flag is 1, that is, when the print key 40 for starting copying is pushed (step S701), the copy processing subroutine is called to execute copying (step S702). However, when the value of the copy flag is not 1, that is, when the print key 40 is not pushed, the step S702 is skipped.

Next, when copying is completed (step S703), the value of the copy flag is set to 0 (S70).
4) Further, the value of the flag A is set to 0 (step S70).
5) Then return. However, if the copying is not completed yet, the above steps S704 and S705 are performed.
Skip.

(E) Another embodiment of the present invention In another embodiment of the present invention, the copy magnification before magnification adjustment is stored as in the above embodiment, and APS is performed using that value. Unlike the above, the system is characterized in that the APS function is canceled when the magnification adjustment key is operated after copying.

As shown in FIGS. 9 and 11, steps S504 and S519 for storing the copy magnification displayed on the display 48 as the APS magnification value in the magnification up / down key processing subroutine S500 are deleted (FIGS. 8 and 9). 10 flowchart). When the magnification up / down keys 46 and 47 are operated by this,
The value of the flag A is set to 1, but the magnification value at that time is not stored. Further, the above-mentioned paper feed selection subroutine S
APS mode flow chart for 600 (FIG. 1
3) is changed as shown in FIG. 14, and S611 and S612 are changed.
During the processing of step S650, step S650 for determining whether the value of the flag A is 0 is inserted. Accordingly, when the magnification up / down keys 46 and 47 are operated, the value of the flag A is 1 (steps S505 and S520).
The processes of steps S612 to S618 are skipped and the process is returned as it is. With the above changes,
The system of the above another embodiment is formed.

[0041]

According to the present invention, in the APS mode,
Since the size of the copy paper desired by the user is selected even after the adjustment of the magnification, there is no mistaken copy, and a troublesome operation for changing the size is unnecessary.

[Brief description of drawings]

FIG. 1 is a sectional view of an electrophotographic copying machine according to an embodiment of the present invention.

FIG. 2 is a plan view of an operation panel of the copying machine according to the embodiment of the present invention.

FIG. 3 is a circuit diagram showing an input / output structure of a microprocessor CPU1 for controlling a copying machine main body according to an embodiment of the present invention.

FIG. 4 is a circuit diagram showing an input / output structure of a microprocessor CPU1 for controlling a copying machine main body and a microprocessor CPU2 for controlling an optical system according to an embodiment of the present invention.

FIG. 5 is a flowchart of a main routine of a program for controlling the copying machine main body according to the embodiment of this invention.

FIG. 6 is a flowchart of a magnification selection subroutine according to the embodiment of this invention.

FIG. 7 is a flowchart of a key processing subroutine according to the embodiment of this invention.

FIG. 8 shows a flowchart of a magnification up key processing subroutine of a magnification up down key processing subroutine of the embodiment of the present invention.

FIG. 9 shows a flowchart of a magnification up key processing subroutine of a magnification up down key processing subroutine of another embodiment of the present invention.

FIG. 10 shows a flowchart of a magnification down key processing subroutine of the magnification up down key processing subroutine of the embodiment of the present invention.

FIG. 11 shows a flowchart of a magnification down key processing subroutine of a magnification up down key processing subroutine of another embodiment of the present invention.

FIG. 12 is a main flowchart of a paper selection subroutine of the embodiment of the present invention.

FIG. 13 is a flowchart of a paper selection subroutine in APS mode according to the embodiment of the present invention.

FIG. 14 is a flowchart of a paper selection subroutine in APS mode according to another embodiment of the present invention.

FIG. 15 is a flowchart of a paper selection subroutine in MPS mode according to the embodiment of the present invention.

FIG. 16 is a flowchart of a copying operation subroutine according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Copier main body 2 ... Photosensitive drum 11 ... Original glass K1 ... Original paper size detector 20 ... Automatic paper feed cassette 40 ... Print key for starting copying 41-45 ... Fixed magnification selection keys 41a-45a ... Selection Fixed magnification display LED 46 ... Magnification up key 47 ... Magnification down key 50 ... Magnification fine adjustment unit selection keys 50a, 50b ... Set magnification unit display LEDs 71a to 74a ... Copy paper size display LEDs 81a to 84a ... LEDs 90 to 99 for inputting copy sheets, ten keys 101 for inputting the number of copies, mode switching key 101a, APS mode display LED 101b, MPS mode display LED 102, manual paper selection key ADF300, automatic document feeding Devices 401 to 408 ... Copy paper size detection switch 1000 ... Stage paper feed unit

Claims (1)

Claim: What is claimed is: 1. A mode specifying means for specifying an automatic paper selection mode, a copy magnification setting means for setting a copy magnification, and a fine magnification adjustment for finely adjusting the set copy magnification in a predetermined unit. Means and the automatic paper selection mode is designated by the mode designating means, the size of the original is detected, and an appropriate copy paper size is selected from the detected original size and the currently set copy magnification. , And an automatic paper selection unit that enables copying with copy paper of that size, and after the automatic paper selection mode is specified and copying is performed in this mode, the copy magnification is finely adjusted by the magnification fine adjustment unit. In this case, the electrophotographic photograph having the automatic paper-sheet selecting function is characterized in that the selected copy-paper sheet size is maintained when the above copying is performed. Copy machine.