JPS6046571A - Copying machine - Google Patents

Abstract

PURPOSE:To increase the degree of freedom of selection and select a proper combination of magnification and form size without increasing the number of paper feeding parts by allowing both copy paper size and copy magnification to be selected for the size of an original. CONSTITUTION:Original size is detected by sensors SEN1-SEN6 provided to an automatic original conveying device, and copy paper size is detected by microswitches SW1-SW4, etc., to control the position of a projection lens 45, varying the magnification. When the original size is detected, a combination of magnification and form size is operated by a specific arithmetic part and a copy is taken. In this case, copying operation is not possible with the operated combination, another combination of magnification and form size is selected. Consequently, the degree of freedom of the selection is increased, and a proper combination of magnification and form size is selected without increasing the number of paper feeding parts.

Description

TECHNICAL FIELD The present invention relates to a copying apparatus with variable copy magnification and a plurality of copy paper loading sections.

Prior Art Conventionally, when obtaining a copy from one original, either the copy magnification or the size of the copy paper is selectively specified, and the other is determined based on the relationship with the specified or detected original size. A copying apparatus that discriminates and automatically selects one is disclosed in, for example, Japanese Patent Application Laid-Open No. 55-28679. Japanese Unexamined Patent Publication 1983
-1547/14. It is described in Japanese Patent Application Laid-Open No. 57-151958.

However, even in a copying machine that can operate in such an automatic selection mode, the number of sizes of copy paper that can be loaded at one time is at most three, and even if the copying magnification is high, it is difficult to select the appropriate paper size from among several types. Since the number of copy threads (sizes and copying magnifications) that can be selected is limited, in actual use, it may be difficult to find an appropriate size or magnification, and the copying operation cannot be performed or is insufficient. In particular, with the method of selecting copy paper size, in order to solve this problem, it is necessary to increase the number of copy paper loading sections. , This naturally has its limits, and the current situation is that it is either a sufficient solution or no solution at all.

Purpose The present invention has been made with attention to these points, and by making the copy paper size and the copying magnification symmetrical to the original size, the degree of freedom of selection is expanded and the copying speed is improved. It is an object of the present invention to provide a copying apparatus capable of selecting an appropriate combination of copy magnification and copy paper size without unnecessarily increasing the number of paper loading sections.

EXAMPLE Hereinafter, an example of the present invention will be explained with reference to the accompanying drawings.

FIG. 1 schematically shows an example of a copying machine including a main body, a document conveyance device, and an ear device. It is equipped with a three-stage paper feed section that can accommodate different types of copy paper.

The photoreceptor drum (30) is located at the center of the image forming means as indicated by the arrow (2).
) direction, and around its shoulders there is a charger (3), a peephole, and an image mount f! (32), transfer charger (33), copy paper separation charger (34), cleaning device (35), eraser lamp (36)
or has been set up. The imaging optical system (40) is installed below the document table glass (39) so that the document image can be scanned, and the illumination light from the light source (41) is reflected by the document on the glass (39) and 1 Mira - (42), now 2 Mi
The photoreceptor drum (30) is exposed in the form of a slit through a projection lens (45) and a fourth mirror (46). In this case the light source (
The second mirror (43) and the first mirror (42) are rotated at a speed of (v/m; m is the copying magnification) with respect to the peripheral speed (V) of the photoreceptor drum (30). 44), is (v
/2m) in the direction of the arrow (b). In addition, in the present invention ζ, control is performed to selectively output various numerical data as the copying magnification (m) as described later, or scanning of the optical system is performed based on a predetermined magnification signal. Various mechanisms for varying the copying magnification by controlling the speed and the position of the projection lens (45) have already been proposed or provided, and in the following explanation, we will only discuss the output of the magnification in general terms. A detailed explanation of the mechanism of the change tube will be omitted. With the above image forming means, the photoreceptor drum (30) is charged, image exposed, and
Development is performed, and the toner image is transferred to each paper feed 1. described below.
(]), (2), and (3) onto the copy paper selectively fed, and the copy paper is transferred to the conveyor belt l-(47).
The toner is then conveyed to a fixing device (48), where the toner is heated and fixed, and then discharged onto a tray (49). The photosensitive drum (30) continues to rotate even after the transfer, and residual toner and residual charge are removed to prepare for the next copying.

On the other hand, the paper feeding section is composed of an overprint paper section (IJ), an intermediate paper feeding section (2), and a sketch paper section (3).
2) uses an automatic paper feeding system using removable paper cassettes (4) and (5), and the sketch paper section (3) uses an elevator automatic paper feeding system that sequentially pushes up the copy paper table (6). , and paper feed rollers (7), (8), (9) are adopted respectively.
), the top layer of paper is fed one by one. In addition, a feeding path is formed from each paper feed section (1), (2), (3) to the transfer section using various idle rollers, guide plates, etc., and a timing roller installed just before the transfer section. In the pair (10), the leading edge of the copy paper selectively fed from each paper feed section Q), (2), (3) and the image forming section of the photosensitive drum (30) are synchronized. .

Switch (SW+) ~ (S'W4), (SW6) I5W
9).

(SWu) to (SWI4) are each paper feed section (1), (2)
, (3) is a micro switch installed in parallel with the skein.
It detects the size of the copy paper in the gutter (4), (5) and on the mounting table (6) and whether it is placed vertically or horizontally with respect to the paper feeding direction. As shown in Figure 3, the copy paper sizes that can be set in each paper feed section (]), (21° (3)) are "A3", "A4", "A5", "
A6", "B4", "135", "B6", rA4Jj
``A5JrR5Jh If you get stuck, you can select vertical/lateral force S.Also, Sui Sochi (SW+) ~ (SW4).

(SW6) to (SW9) are cassettes (4), (5)
It also detects the attachment and detachment of the paper feed section (])', (
This means indirectly detecting the presence or absence of copy paper in step 2). First, the size and loading direction of the copy paper in each paper feed section (1), (2), and (3) can be determined using a switch (SWl).
) ~ (SW4), (SWs) ~ (SW9'), (SW+
Detection is possible using a 4-bit code corresponding to the on/off combination of SW14) to SW14. For example, a code table using switches (SW+) to (S'W<) is shown below. In this table, "0" indicates the switch is on, and "1" indicates the switch is off. If all the switches are off, it means that the cassette (5) is not installed in the paper feed section (1). The absence of copy paper will be detected.

Continuing, the microswitches (SW5) and (SW+o) provided in the paper feed section (]) and (2) are respectively connected to the cassette (
4) Directly detect the presence or absence of copy paper in (5).

A photoelectric switch (SW16) provided on the table (6) of the paper feed section (3) also directly detects the presence or absence of copy paper on the table (6).

It should be noted that another microswitch (S W 24 ) provided in the paper feed section (3) is used to detect the top layer of copy paper in order to control the rising dust on the mounting table (6).

On the other hand, automatic document feeder (hereinafter referred to as ADF)
(100) is removably installed on the upper surface of the main body of the copying machine (50). As described later, when it is detected that AI)v (1oo5 is electrically connected to the main body of the copying machine (50) and set at a predetermined position, AI)
) and copy R (50) are linked to each other, and the operation mode of the copy machine (50) is switched to A I) F mode. A I) F mode means that when the copy start key provided on the ADF (100) is operated, the copy machine (
The ADF (1°00) starts operating while 50) remains in the standby state, and feeds the original placed on the original tray (101) along the top surface of the original placing glass of the copying machine (50). , stop at a predetermined position and A D F (100)
A start signal is output from Copy Th (50) to start the above-mentioned copying operation, and when the final scanning movement for the original is completed, the ADF is sent from the copying machine (50).
An operation signal is output to (100), and A D F (100)
discharges the original onto the paper discharge tray (109). At this time, if the next original is on the original tray (101), the next original is also conveyed to a predetermined position at the same time as the paper is ejected.

The ADF (100) generally includes a document feeding unit (A unit) (102) that stores documents and feeds them one by one.
A document conveyance section that transports the sent document by sandwiching it between the top surface of the document placement glass, stops it at a predetermined position on the glass ml, and sends out the document on the glass surface to the paper ejection tray (109). (DF unit) (105), the DF unit (, 1Q5) can be used alone as a manual document transport device, and the copy M (50
) When attached to the top surface, it can be opened and closed with respect to the main body of the copying machine (50) so as to expose the document placement glass.

The A unit (]02), the D F unit (105) and the copying machine (50) are mechanically and electrically connected to each other,
When the DF unit (10'5) is closed against the top surface of the main body of the copying machine (50) and this is detected by the detection switch (psw), the copying machine (50) is controlled to operate in ADF mode. Copy 11. (50) and AD
F(100) enters a linked state.

Anr; (100) sets the original on the original tray (10'l) and sends the original to the first sensor (SUND).
It becomes possible to operate by detecting whether The first sensor (
SEND) is made up of, for example, a combination of a light emitting element and a light receiving element that are arranged opposite to each other with an original tray (IOI) in between.When the light receiving element detects the light from the light emitting element, it is determined that the original is one copy.

When a start signal is issued with a document set on tray N0I), the document feed roller (103) is rotated and lowered to be pressed against the top surface of the document.
This advances the document. The sent out document advances between the normal transfer delivery roller (104) and the reverse separation roller (]B1), whereby only the topmost sheet is sent out to the I)F unit 1-(105) side. When the second sensor (SUN2) detects the document sent out by the normal transfer feed roller (104), the document feed roller (103) is lifted and released from contact with the document.

When the document is further fed and passes between the feed roller pair (106) and (111) of the T) F unit (10, 5) and is detected by the third sensor (S F, N31), the pinch roller pair (], B0), and (111) are brought into pressure contact with each other, the forward feed roller (104) and the reverse roller (+10) are stopped, and the bell (107) is driven. Then, with a slight delay, the pinch roller pair (
106) (111) are driven, and the gate stopper (11) is driven.
2) is opened and the original is sent out. The sent original is placed on the original placing glass (+6)-1 by the belt (107).
= document is conveyed, and after the trailing edge passes the third sensor (SENa), the document stops after a certain period of time (timer), and then the belt (107) is driven in the reverse direction to move the trailing edge of the document to the stopper (113) (fJ1). (see figure) and stops, completing the document feeding operation.

When the original is stopped on the original placing glass (16),
Send a signal from n F (100) to the copying machine (50),
A copy operation is started. At this time, A unit (1o2)
When a document is set in the document gate stopper (
The feeding operations up to 112) are executed.

When the scanning movement of the scanning optical system (10) accompanying the copying operation is completed, a signal is sent from the copying machine (50) to the ADF (Ton), the bell (107) is driven again, and the document placement glass (16) is driven. ) is conveyed in the ejection direction, and after a predetermined delay (timer), a pair of pinch rollers (106).

The operation (III) for pressing the document and feeding the next document is performed in the same manner as described above. However, if the copying machine (5o) is in the multi-copy mode, the ejecting operation of the original does not start until the scanning movement related to the final copy is completed.

As mentioned above, the DF unit (105) is connected to the copying machine (50
) and can be used like a document cover. Therefore, the belt (107) is a medium-wide one-piece belt, and the document can be placed manually on the DF unit (1o
5) By closing the cover and pressing the print key of the copying machine, copying operation in the normal mode can be started.

FIG. 2 shows an embodiment for detecting the document size according to the present invention. The original transported from unit A (1o2) is passed through a pair of pinch rollers (106) (111).
) onto the platen (39), but the length of the document at this time is the same as that of the pulse disk (114).
The pulse signal generated by the sensor (SEND) is input to the second CPU (3o2') and measured. That is,
As shown in FIG. 3, which will be described later, the output of the sensor (S, EN5) is determined by taking the logical sum of the sensor (SENa) that detects the passing document and the pinch roller drive output, and outputting the output to the second CP u.
(302) and the original is sent to Sen-1-(SENa).
), the document length signal is obtained by counting the number of pulses during the passage. In addition, a sensor (SE
N6) is for classifying the length of the document in the width direction,
For example, in the case of an A4 or B5 size document, if it is placed horizontally (s
EN6) is ONL, if vertically installed (SEN6) is OFF
A4. A5. B5. Identify the size such as B5.

With the above configuration, the second CPU determines the size of the original and corresponds to the above-mentioned copy paper size code.
(302), and transmits it to the CPU (301) using a communication method described later.

Copying machine (5o) and ADF (1
00), the first CI'U (301) and the second CI'U (3
02).

The 1st ICPU (:301) controls the numeric keypad (303), the print key (SW+6), and the other (SW+) to (S
A key matrix (300) including keys such as W15), a display (304) that displays the number of copies according to the operation of the numeric keypad (303), light emitting diodes (305) for various displays, etc., and a decoder (306). ) are connected through. In addition, the first CI'U (301) has an output port connected to the main motor, in order to control the operation of the copying machine.
It is connected to drive circuits (not shown) such as the developing motor, clutch lens moving motor, optical system drive motor, and charger, and further includes an interrupt signal output (PCo), 7'-9 input terminals (Sin), (Sout) and ADF via data sample and output clock (SCK)
a second CPU that controls the operation of the CPU (100) and transmits signals related to the operation to the second ICPU (301);
UC302).

The second CPU (302) has a start key switch (SSW) and a D F unit (105) at its input port.
) and the first to sixth document sensors (SEN1) to (SEN6) are connected, and the output ports are connected to the document feed roller (103), forward rotation and reverse rotation rollers (104), ( 110), pinch roller (106),
(111) etc. (not shown)
It is also connected to a drive circuit (not shown) for a solenoid that presses the paper feed roller (103) onto the document surface, a pair of pinch rollers (106), and a solenoid that presses the pair of pinch rollers (Cl11).

The terminals (Bl) and (B2) in the figure are the main motor (not shown) of the copying machine (50) and the motor (not shown) that drives the belt (107) in the D F unit (105), respectively. ) is input, and the mechanical drive is synchronized with the control by the CPU.

As described above, the first. 2nd CI'U (301), (3
02) execute the processes shown in the flowchart of FIG. 4.5.6.7 while exchanging signals with each other.

The control operation of the copying apparatus of the present invention will be explained below according to the steps in the flowchart.

In step (2) shown in FIG. 11, operation setting items such as the reset number of sheets for each flag are initialized. Next 111"
This is a flag that enables paper feeding when ``0'' and disables paper feeding when ``0''. TURF (B1), (112), (113
) correspond to paper feed units (1), (2), and (3), respectively, and in this case indicate that paper feed unit (3) is selected initially. Step 3 initializes the copy magnification to 110, that is, the same size (M'G) stores the copy magnification in the internal RA
M, and the lens position and scanning speed are controlled according to the value of (MG). Next, at step (2), a timer (main timer) for defining the length of one routine is set. This timer may be an internal timer of the first CPU (301) or an external timer.

In step 2, the numeric keypad and various external devices process input signals from the switchboard and output signals to the motor, solenoid, and display device. In steps ■, ■, and ■, the copy paper size input in step ■ is stored in the internal RAM PS, IZE (i
ll), (112), and (113), respectively.

PSTZE←gl), (B2), i3) are also TUrt'F
'C#1), (B2), and (B13) correspond to paper feed units (1), (2), and -(3), respectively.

In step 1, it is determined whether the copy flag is 110" or not. If the copy flag is 0, that is, if copying is not in progress, proceed to step O, and turn the copy signal to 1 to 0 with the Ste knob. 〃 and proceed to Ste-tsubu [phase].

When the copy flag is 111'', that is, when copying is in progress, proceed to step (2), set the copy signal to OFF, and proceed to step O.The copy signal is sent to the copying machine (50) or the ADF ( 10, 0).As will be described later, the copy flag is set to l11# when the print switch (SW+g) is turned on, and is set to v'0〃 at the end of a series of copying operations. - In step O, it is determined whether or not the ADF (100) is attached.This determination may be made, for example, if the communication signal from the ADF (,100) is not received, it may be determined that the ADF (100) is not attached. However, the determination may be made using a switch (not shown) that is activated when the ADF (100) is attached.If it is determined in step O that the ADF (100) is attached, then in step O )E signal is '1'
1 Determine whether it is ON or not. The ADF MODE signal is 1 when copying is performed using ADF (100).
1", and when the ADF (100) is operating, reception of the print switch (SWI6) is prohibited in step (2). ADF MODF.

When the signal is %1N, proceed to step (2), and when the signal is 10, proceed to step (2).

In step (2), it is determined whether or not the print switch (SW+s) has been pressed. If it has been pressed, the copy flag is set to "I" in step (2), and the copying process is performed in step O. If the print switch (SW16) is not pressed, proceed to step (2). Next, in step ○, it is determined whether or not the set number of copies have been made, and if the set number of copies has been made, the copy flag is set to "0" in step ■, and then (
At step A, set the original ejection signal to 11" and press the ADF.
Against (・100.)! Then, an instruction is given to eject the original onto the platen (39) in preparation for the next copying.

On the other hand, if the AV)F MODE signal is 1〃 in step O and it is determined that the ADF is being used,
Proceed to step ■, and when the original is in the normal position on the original glass (39), input the original normal position signal which becomes -IN.
If the original position signal is not set to 1#, step 1. Press ■ to set the fixed position flag to 11,
Set the document ejection signal to 10 using the stem knob, and set the manual signal to 10 using the stem knob, and proceed to step ①.

When the original position signal is 11#, the Stereo knob ■
Proceed to step 1 and determine whether or not the home position flag is ``1''. Through this operation, the document home position signal rises from 0" to 11# and is detected, and the time when the document reaches the predetermined position is determined. To detect. When it is detected that the document has arrived, the process advances to the step knob (2), sets the home position flag to 10, and proceeds to step (2).

Step (2) consists of subroutines shown in Figure 5), @ and Figure 6, and in this subroutine AI)F
(100) determines whether the optimal copy paper and copy magnification can be obtained for the detected original size, and if the optimal one is found, proceed to step O; if the optimal one cannot be obtained, the process proceeds to step O. Proceed to step ○. Step ■
Then turn off the manual display and set the copy flag to "1" in step [Phase] to start the copying operation. In step O, turn on the manual display and set the manual signal to 11" in step [Phase] and proceed to step ■ Proceed to. The manual signal is a display that lights up when the optimum copy cannot be obtained, and is a part (not shown) of the display bag flf (305) in FIG. 2.

The manual signal is a signal that informs ADF (1'00) that an optimal copy cannot be obtained.

In other words, when AI) l・(100) is used, reception of the print switch (SW +g) of the copying machine is prohibited, and depending on the document size and fixed position signal sent from AI)F (100), Determine whether to start copying.

In step (2), data is sent to and received from the ADF (100). The transmission and reception processing of the AI)F (100) is processed by an interrupt from the first CPU (301). Then, in step (2), it is determined whether or not the timer time set in step (2) has expired. If it has, the process returns to step 4; if it has not finished, step @ is looped to adjust the length of one routine.

Next, the subroutine AUTo of step (2) will be explained with reference to the flowcharts of FIGS. 5(a) and Φ) and FIG. 6. Step ① of Fig. 5 GIL) is ADF (
The document size code (DSIZ) sent from
E) is stored in a memory (1) CMNT) such as a RAM.

In step (2), it is determined whether the original size code is 18" or more, and if it is 8 or more, 8 is subtracted from the original size code in step 7" or below, proceed directly to step O.
Proceed to. The process in step (2) is for eliminating the distinction between the vertical and horizontal directions of the document, and is used in the process described later.

In the step σ chain, set the counter (to) to v'θ'' and proceed to step 105.The counter (to) represents the difference between the copy paper size code and the original size code, and (to)
The copy magnification is determined by 4fi.

Step () is a subroutine whose details are shown in Figure 5 (b), and the optimal copy paper determined from the original size code and copy magnification is placed at the paper feed port (]), (2), (3).
Determine whether it is attached to either of the
).

Here, the subroutine (PSEAR(J()) will be explained. First, step (the counter is already set) in FIG. 5(b) is set to 11. The value of the counter (n) is
) (2) and (3), and in this embodiment there are three paper feed slots, the value of width) also ranges from 1" to 113 LL. In step @, the document size is divided from the hood and the copy magnification. It is determined whether the optimal copy paper size that has been output is loaded in the paper feed slot (n), and if so, the process proceeds to step ■k (Fig. 6) of the subroutine (AUTO) at step ■. If not, step ■■ and set the counter (n) to 11.
Add 〃. The processing of steps σ) and ■ is repeated until the counter (n) becomes 4 or more in step ■). When it reaches %411 or more, the subroutine (
Proceed to step furnace (AUTO).

In step (step), it is determined whether the counter (to) is greater than or equal to 0. If it is greater than or equal to 'o', the process proceeds to step ■1.
If it is less than "o", proceed to Ste/Knob■.

When the value of the counter (to) is equal to or greater than J〃, it indicates that the copying magnification is enlarged, when it is v'0〃, it indicates that it is the same magnification, and when it is less than "-1", it indicates that it is reduced.

In step ■, 111 Ll is added to the counter, and in step S, it is determined whether the size is the optimum copy paper size determined from the original size and copying magnification or the maximum copy paper size or less. , if YES, step O
If NO, proceed to Step Nob O. In step O, it is determined whether the value of the counter (to) is less than or equal to 14", and if it is less than or equal to 4, the process returns to step O.
“If the value is larger than 1-1 in step O,
” and return to step O. For N=4, the copy magnification is 2.0.
Indicates times (length ratio). In this embodiment, the variable range of copying magnification was set to 20 to 0.5 times.

If (to) is smaller than 0'' in step O, that is, if the copy magnification is reduced, 1 is subtracted from (to) in step ■, and in step O, the optimal value determined from the original size and copy magnification is It is determined whether the copy paper size is greater than or equal to the minimum copy paper size, and if YT' or S, the process proceeds to step (3), and if NO, the process proceeds to step O of the main routine.

In step ■, it is determined whether the value of the counter (to) is greater than or equal to "-4", and if it is greater than or equal to 4#,
If the size is smaller than '-4'', proceed to step O.In other words, by the process in step 6, the copy paper size and copy magnification are varied to make the optimal copy for the detected original size. We will check whether it can be obtained or not.

If it is determined that there is an optimal copy paper at step σ, step Φ is performed according to the value of the copy counter (N) as shown in FIG.

Branches to (Q, ($), ■,, ■,
), the copy magnification of 0.5x is stored in the memo IJ (MG).

Steps (@ , (@ , (4', +) Similarly to Step 6, perform processing to store the copying magnification determined respectively in the memo IJ (MG) according to the value of the counter (N). Step (@ < N = -3), it is determined whether the original size is A series or B series, and if it is A size, the copy magnification 0.576 is stored in the memory (MG) using a step box, and B size is stored. 062 at step 0 if
0 times are stored in the memo IJ (MG). Step area Φ ~ σD, @) ~ ■■, death h ~ (sumo step (■ ~
Similarly to O, the process of setting the copy magnification is performed based on the value of the counter (N) and the series of document sizes. That is, if the value of the counter (N) is an even number, the same series (A-)A, B
→ Select the copy magnification for B), and if it is an odd number, select the copy magnification for the different series (
Select the copy magnification to A −+ B or B −+ A).

In the step, the counter (
In accordance with the value of (n), the paper feed enable flag TURF (n) corresponding to the value of (n) is set to N1'', and the process proceeds to step 0 of the main routine through step (2) to start the copying operation.

Next, the control operation of the ADF will be explained.

In FIG. 7, initialization is performed at step (■), and a main timer that defines the length of one routine is set at step (○).1. Execute various inputs and outputs in step ■. In step Φ, it is determined whether the open/close switch (psw) is closed, that is, whether the DF unit (105) is actually set on the platen (39) so that the ADF (100) can operate; If YES, step ■9
If the answer is NO, proceed to step (3). In step ■), set all the flags to ``0'' and use the Ste knob () to
Set the FMODE signal to "0", set the original position signal to 50" in step (), turn off the output of the motor, solenoid, etc. in step (), and proceed to step ■.

ADFMo sent to the first CPU (301) in ()
Whether the DE signal is 10" or not, that is, ADF (100)
If the answer is YES, the process proceeds to step (2), and if the answer is NO, the process proceeds to step (2). In step ■ Boil, it is determined whether the paper feed flag is ``No'' or not. If SS 1 //, proceed to step ■; if Yes, proceed to step ■, and the ejection flag is 10''. Determine whether or not there is, and if it is a town, go to step ■, 0
”, proceed to step ■ and further determine whether the original position signal is SSO // or not; if 111 //, proceed to step (); if 110 //, proceed to step ■ Proceed to.

The series of processes that proceed from step Q) to step () via This is the process to go through to start.

In step Q), it is determined whether or not the copy signal transmitted from the first CPU (301) is UQI/, that is, whether or not copying is in progress. In this case, proceed to step σ and perform A
Determine whether or not the DF start switch (s sw) has been pressed, and if it has not been pressed, proceed to step (foundation).
If the button has been pressed, proceed to step (2) to determine whether the original position flag is 10, that is, whether or not there is no original on the platen (39), and then press N.

In this case, proceed to step O and set the original position signal to Ll.
1 // and proceed to step ■. YES in step ()
In the case of S, it is determined in step O whether or not there is a document on the document tray (101). If there is no document, the process proceeds to step (); if there is, the process proceeds to step (2).

In step O, the ADF MODE signal sent to the first C'Pu (301) is set to SS 1 //, and in step (2), the paper feed flag is set to "1".

The paper feed flag is a request flag for performing paper feed processing in step (2). In the non-step Q), it is determined whether the paper feed flag is 1" or not, and if NO, proceed to step ■ and select YES.
In this case, the process proceeds to step O, where a series of controls related to paper feeding are performed, and in step O, it is determined whether or not the paper feeding has ended, that is, whether or not the document has been conveyed to a fixed position on the platen (39). If No in step O, proceed to step ■; if YES, proceed to step ■, set the paper feed flag to SS
), set the original position signal sent to 51〃, and step (
) to set the original position flag SS 1 // and step ■
Proceed to.

In step ■, it is determined whether or not the document being conveyed onto the platen has passed the sensor (sm3). If NO, proceed to step ○; if YES, proceed to step 7■
Calculate the document size based on the data obtained from the sensor (SEN 5) and (SEN (3)), and
The coded document size is transmitted to the first CPU (301) by interrupt processing from the CPU (301).

In step ■, it is determined whether the original ejection signal sent from the first CPU (301) is N1'', that is, whether copying has been completed and a request for original ejection has been received, and if No, the process proceeds to step ■. If YES, proceed to step @ and determine whether the original position flag is 11. If the original position flag is 0, proceed to step ■; if town, proceed to step ■ Proceed to step 7 and set the ejection flag to ``1'', set the original position flag to ?0 in step 7, and set the original position signal sent to the first CPU (301) to 10 in step 7. (Proceed to step 3.) The ejection flag is a request flag for ejecting the document from the platen (39) in step (3).

In step (), it is determined whether the discharge flag is XL 1 //, and if NO, proceed to step (), and Y
In the case of ES, proceed to step ■ and perform a series of document ejection controls, and in step ■ judge whether or not the ejection process has been completed. If NO, proceed to step ■, and if YES, proceed to step Proceed to (), set the discharge flag to 20, and proceed to step (2).

In step (2), it is determined whether or not there is a document on the document tray (101), and if there is, step (sets the boiled paper feed flag to "1" and enters the next copying cycle. If there is not, step ()) Set the ADFMODE signal to “0” with
The operation of F (100) ends.

Step 7 (In step 7, it is determined whether the manual signal sent from the first CPU (301) is 11" or not. If NO, proceed to step ■; if YES, proceed to step ■ and print the original. Set the home position signal to "0" to prepare for restarting the copying operation.

In step ■, it is determined whether the main timer set in step
If the answer is NO, the step (step) is looped to define the time for one routine, and the optimum copy magnification is determined according to the document size detected by the ADF (100) by the process described above. and the copy paper size are automatically selected and the copying operation is executed. In the above embodiment, an example was shown in which the document size is determined while the document is being conveyed by the ADF (1,00), but the copying machine side It is easily possible to perform size discrimination in the same manner as described above by providing a reflection type sensor in the original document, and many other document size discrimination mechanisms have been proposed, and these may be adopted as appropriate.

In addition, in the above embodiment, in order to obtain the optimum copy, the standard is the same size, and if the optimum copy cannot be obtained at the same size, the copy magnification is enlarged, and if it cannot be obtained even with enlargement, the copy magnification is reduced. We have shown a method for calculating whether an optimal copy can be obtained by changing the maximum or minimum copy magnification. Good too. In addition, in the above embodiment, the optimum copy paper size was searched for regardless of whether it was A series or B series.
Copy paper sizes are A and B in correspondence with original size A and B series.
One of the B series may be searched preferentially.

Furthermore, in the above embodiment, when the document is placed vertically, the vertically placed copy paper is selected, and when the document is placed horizontally, only the horizontally placed copy paper is selected. From the perspective of not having to do this, the process may be performed regardless of the placement direction.

In addition, in the above embodiment, a method was shown in which the copy magnification is given priority and the appropriate copy paper size is selected. It is also possible to select them in order of priority, calculate an appropriate copying magnification from this and the document size, and select an appropriate copying magnification that does not cause image loss. In this case, if the copying machine is capable of virtually stepless numerical setting of the copy magnification, there is no need to select the magnification, and the calculated copy magnification data can be used as control data as is. All you have to do is check whether the numerical data obtained is within the executable magnification range of the copying machine. Furthermore, in this case, the copy paper size selection priority is
The determination may be made variably based on the size series or the vertical/horizontal distinction of the detected document. For example, if the original is A4 portrait, the copy paper selection priority is A4 portrait, A4 portrait,
B5 vertical, B4 vertical, if the document is B5 horizontal, B5
You can program it according to the document size, such as horizontal, A4 horizontal, or B4.

Effects As explained above, the present invention provides a copying apparatus having a variable copy magnification and a plurality of copy paper loading sections, including a document size determining means for determining the size of a document, and a document size discriminating means loaded in each loading section. A copy paper size determining means for determining the size of the copy paper that is used, and a combination of copy magnification and copy paper size that allows copying the original onto the copy paper without image loss based on the determined size of the original. Selects a calculation means to perform the calculation and a copy paper loading section loaded with copy paper of the size determined by the calculation, and controls so that paper is fed from the selected loading section in conjunction with the copying operation. , a copying apparatus comprising control means for controlling to select another combination of copying magnification and copying paper size when the copying operation based on the combination of copying magnification and copying paper size determined by the above calculation cannot be executed. This increases the degree of freedom in selecting the copy paper size and copy magnification based on the original size.
It is possible to select a combination of size and magnification suitable for copying without unnecessarily increasing the number of copy paper loading sections or the number of set copy magnification stages.

[Brief explanation of drawings]

Fig. 1 is a sectional view schematically showing the configuration of a copying machine including a copying machine main body and a document transport device, Fig. 2 is a perspective view showing the main parts of the document transport device, and Fig. 3 is a copy machine and a document transport device. FIG. 4 is a circuit diagram showing a microcomputer that controls the conveyance device and its input/output relationship; FIG. 4 is a flowchart showing the control processing means executed in the microcomputer for controlling the copying machine; FIGS. 5(a) and (b) 6 is a flowchart showing details of the subroutine V\AUTO// in the flowchart of FIG. 4, and FIG. 7 is a flowchart showing the control processing procedure executed in the microcomputer for controlling the document conveying device. DESCRIPTION OF SYMBOLS 1... Upper paper feed section, 2... Middle paper feed section, 3... Lower paper feed section, 30... Photosensitive drum, 40... Image forming optical system, 42° 43.44. 46...mirror, 45...
- Projection lens, 50... Copying machine main body, 100... Automatic document feeder, 114... Pulse disk, SEN l
-SEN 5...Original sensor, swi~SW4°S
W6~SW, 9, SW+, t~5W14...
Copy paper size detection switch. Applicant: Minolta Camera Co., Ltd. Figure 4-If)ri-

Claims (1)

[Scope of Claims] 1. In a copying apparatus having a variable copy magnification and a plurality of copy paper loading sections, there is provided a document size determining means for determining the size of a document, and copy paper loaded in each loading section. and an operation for calculating a combination of copy magnification and copy paper size that allows copying the original onto copy paper without image loss, based on the determined size of the original. and a copy paper loading section loaded with copy paper of a size determined by the performance, and controlling the copy paper loading section to feed paper from the selected loading section in conjunction with the copying operation. The present invention is characterized by comprising a control means for controlling to select another combination of copy magnification and copy paper size when the copying operation cannot be performed based on the combination of copy magnification and copy paper size determined by the calculation. Copying equipment.