Copying apparatus capable of automatically selecting copy paper size and control method for controlling operation of copying apparatus

A copying apparatus capable of automatically reproducing an image at different magnifications without operator's paper selections as well as automatically making a copy of a selected area of a document with an optimum size. The apparatus comprises an image forming device having a plurality of copying modes; paper feeding devices accommodating copy paper sheets of different size; a copying mode selecting mechanism; and a paper feeder selecting mechanism, wherein the selection is effected in response to the selection of the copying mode, regardless of a size of a document. A control method capable of automatically reproducing an image at different magnifications without operator's paper selection as well as automatically making a copy of selected area of a document with an optimum size. The method comprises the steps of: selecting a copying mode; designating a copy paper size corresponding to the selected copying mode; selecting the copy paper sheet if there is a copy paper sheet with the designated size in an automatic paper feeder; and indicating a request of feeding manually its copy paper sheet if there is no copy paper sheet in the automatic paper feeder.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
The present invention generally relates to a copying apparatus, and more 
particularly to a copying apparatus which is capable of automatically 
selecting a size of a copy paper sheet. 
2. Description of the Related Art 
Conventionally, there are provided copying machines which are capable of 
carrying out a copying operation at a desirable magnification ratio which 
is selected out of a plurality of available magnification ratios which are 
predeterminedly fixed. The fixed magnification ratios, for example, may be 
0.707-magnification, 0.865-magnification and 1.414-magnification. These 
magnifications are determined so as to correspond to enlargement and/or 
reduction between regular-sized sheets. That is, 0.707-magnification is 
applied to reduction from A3-size to A4-size(at longitudinal position), 
0.865-magnification is applied to reduction from A3-size to B4-size( at 
longitudinal position ), and 1.414-magnification is applied to enlargement 
from A4-size (at longitudinal position) to A3-size. 
As described above, the magnification ratio of ".times.0.707" corresponds 
to a reduction-copying between the A3-sized and A4-sized regular sheets. 
Therefore, the magnification ratio of "0.707" is usually selected, 
assuming that the reduction from A3-size to A4-size at its longitudinal 
position is performed. To this end, the copying machine automatically 
selects the A4-sized copy paper sheet which is positioned longitudinally 
in case where the magnification ratio of "0.707" is selected. 
The above-mentioned disadvantage is caused at selection of another copying 
mode as well as at the selection of the magnification. For example, when a 
copying mode of copying from two originals on a document platen to an 
individual copy paper sheet (it is a so-called book mode) is performed, it 
is necessary for some users to take an action for selecting the A4-sized 
sheet positioned sideways in addition to taking an action for the 
selection of the copying mode every time the book mode is selected, 
nevertheless they always use the A4-sized sheet positioned lengthwise. 
Furthermore, in an edition mode representative of copying an only image of 
an optional area which is assigned in the original, it is necessary to 
select the copy paper sheet having the size suitable for copying the image 
of the fixed area every time the area is fixed. 
SUMMARY OF THE INVENTION 
Accordingly, a first object of the present invention is to provide an 
improved copying apparatus having easy handling in operation. 
A second object of the present invention is to provide an improved copying 
apparatus not requiring an operation of selecting copy paper sheet by an 
operator. 
In accomplishing these and other objects, according to the present 
invention, there is provided an improved copying apparatus which 
comprises: an image forming means having a plurality of copying modes 
which are correlated with predetermined copy paper sizes, respectively; a 
plurality of paper feeding means, each of which accommodates copy paper 
sheets of which the sizes are different from each other; a first selection 
means for manually selecting one of the copying modes; and a second 
selection means for automatically selecting one of the paper feeding means 
in which the copy paper sheets having the size correlated with the copying 
mode selected by the first selection means are accommodated, wherein the 
selection of the paper feeding means is effected, regardless of a size of 
an original document, in response to the selection of the copying mode. 
In carrying out the present invention in one preferred mode, one of the 
copying modes is equivalent to a copying operation at different copy 
magnifications. In such a case, the respective magnification ratios have 
the respective predetermined sizes of the copy paper sheet, 
correspondingly. Therefore, when an operator selects one magnification 
ratio, the apparatus automatically feeds the copy paper sheet, the size of 
which is optimum, regardless of the size of the original document. 
Consequently, the copying operation is quite easy for the operator as well 
as no selection of the copy paper sheet at enlargement/reduction copying 
is requested to the operator. 
According to ,one preferred embodiment of the present invention, the 
apparatus is so constructed that a second selection means automatically 
selects one of the paper feeding means in which the copy paper sheets 
having a specified size are accommodated, wherein the selection of the 
paper feeding means is effected in response to the selection of the second 
mode, regardless of a size of the original document. In this case, if the 
copying modes are equivalent to a first copying mode and a second copying 
mode, the first copying mode representing that an image of an original 
document on a platen glass is formed onto a copy paper sheet, i.e., it is 
a so-called normal copying mode, and the second copying mode representing 
that each image of two original documents on the platen glass is formed 
onto an individual copy paper sheet, i.e., it is a so-called book copying 
mode applied for copying from an opened book, the apparatus automatically 
forms each image of the two documents on the platen glass onto an 
individual copy paper sheet when the operator selects the second mode. 
Consequently, in this apparatus, the copying operation is quite easy for 
the operator as well as no selection of the copy paper sheet at book 
copying is requested to the operator. 
Further, according to one preferred embodiment of the present invention, 
the above-mentioned paper feeding means comprises a first paper feeding 
means including a plurality of paper feeding units, each of which 
accommodates copy paper sheets, for automatically feeding the copy paper 
sheet therein to the image forming means one by one in response to a 
signal of paper feeding and a second paper feeding means for feeding a 
copy paper sheet to be manually set therein to said image forming means. 
Further, the above-mentioned second selection means comprises a sheet size 
designating means for designating a copy paper size which is correlated 
with the copying mode selected by the first selection means and a means 
for automatically selecting one of the first and second paper feeding 
units in which the copy paper sheets with the size designated by the sheet 
size designating means are accommodated. And, the apparatus further 
comprises an indication means for indicating a request of setting a copy 
paper sheet at the second paper feeding means when there is no copy paper 
sheet with the size designated by said sheet size designating means in the 
first paper feeding means. In this apparatus, if the copy paper sheets 
with the optimum size are not accommodated, in the copying apparatus, the 
apparatus gives an indication that there are no copy paper sheets with the 
optimum size for copying through the indication means. Consequently, the 
operator always carries out copying with the optimum size of the copy 
paper sheet. 
In accomplishing an operation of the above-mentioned apparatus, according 
to the present invention, there is provided an improved control method for 
controlling an operation of a copying apparatus having automatic paper 
feeding means and manual paper feeding means, comprising the steps of: 
selecting a copying mode; designating a copy paper size which is 
correlated with the selected copying mode; selecting the automatic paper 
feeding means for paper feeding if there is a copy paper sheet with the 
designated size in the automatic paper feeding means; and indicating a 
request of setting a copy paper sheet at the manual paper feeding means if 
there is no copy paper sheet with the designated size in the automatic 
paper feeding means. 
According to the control method described above, the copying operation is 
controlled so as to automatically feed the the copy paper sheet, the size 
of which is always optimum. Therefore, the operator is freed from the 
operation of selecting the size of the copy paper sheet. If the apparatus 
has no copy paper sheets therein, such information is given to the 
operator automatically, so that the operator may feed the copy paper sheet 
manually. Therefore, the control method according to the present invention 
achieves an easy and simple operation to the operator, resulting in that 
careless copying mistakes can be effectively prevented. 
As is apparent from the foregoing descriptions, as the copying mode, 
several modes are applicable thereto. For instance, one is a copy 
magnification, and another is a copying mode on enlargement/reduction of 
an assigned area in an original, and still another is a special copying 
mode like copying from an opened book described previously. 
In the apparatus described previously, there are provided some preferred 
modes in carrying out the present invention. 
For example, in the apparatus having the first and second paper feeding 
means and the indication means, it is so constructed that the first 
selection means selects one of the copying magnifications as one of 
copying modes and the second selection means designates a copy paper size 
which is predeterminedly correlated with the copying magnification 
selected by the first selection means and automatically selects one of the 
first and second paper feeding units in which the copy paper sheets with 
the size designated by the sheet size designating means are accommodated, 
wherein the selection of the copying magnification is effected in response 
to the selection of the copying magnification, regardless of a size of a 
document. In this case, the apparatus automatically selects the copy paper 
sheet with the optimum size corresponding to the selected magnification, 
or the apparatus gives an indication that an operator has to set the copy 
paper sheet with optimum size in the second paper feeding means to the 
operator. Therefore, the operator only takes an action of setting the 
sheet with the indicated size, so that he can make a copy without any 
failure. Accordingly, there is no need to exchange a cassette or the like. 
If the copying mode has the first and second modes previously described and 
the apparatus provides a mode selection means for selecting either the 
first or second mode, as previously described, a copy paper sheet with the 
specified paper size is automatically selected when the second mode is 
selected. And if there are not that sheets of the specified size in the 
first paper feeding means, the apparatus gives an indication that an 
operator has to set that sheet in the second paper feeding means. 
Further, the present invention provides a copying apparatus which 
comprises: an image forming means having a plurality of copying modes; a 
paper feeding means including a plurality of paper feeding units, each of 
which accommodates copy paper sheets, for automatically feeding the copy 
paper sheet therein to the image forming means one by one in response to a 
signal of paper feeding; a first selection means for selecting a copying 
mode; a first designating means for designating a first copy paper size, 
on the basis of a first rule, in response to the selection of the copying 
mode; a second designating means for designating a second copy paper size 
on the basis of a second rule when there is no copy paper sheet with the 
first size in the paper feeding means; and a second selection means for 
automatically selecting one of the paper feeding units in which the copy 
paper sheets with the designated size are accommodated. 
In carrying out the present invention in one preferred mode, a copy, 
magnification can be selected as one of the copying modes, or either the 
first or second mode previously described can be selected as one copying 
mode. In response to the selection of the copying mode, the size of the 
copy paper sheet is designated, wherein the selection is effected on the 
basis of the first rule. The first rule, for example, represents a TABLE 
which provides a relationship between the magnification ratio and the 
paper size, or a specified size. The above-mentioned second rule, for 
example, represents that a one rank-up size may be selected. Accordingly, 
if the copy paper sheet with the selected size is not available in the 
paper feeding means, the copy paper sheet having a larger size than the 
selected one is automatically selected and fed to the image forming means. 
Therefore, an operator gets a copied sheet with the complete original 
image. That is, in this apparatus, there is no need to decide the size of 
the copy paper sheet to be used on the occasion of the 
enlargement/reduction copying and the like, resulting in that operation 
time can be reduced. In addition the operator avoids the necessity of 
looking for the copy paper sheet or exchanging a cassette. 
Still further, according to one preferred embodiment of the present 
invention, there is provided a copying apparatus which includes the first 
and second paper feeding means, the second selection means, and the 
indication means, all of which are previously described, comprising; an 
area assignation means for assigning an optional area in an original on a 
document platen, an image forming means capable of forming an image of the 
assigned area, and sheet size designating means for designating a copy 
paper size which corresponds to the assigned area. In this apparatus, the 
copy paper sheet with the size corresponding to the area is automatically 
selected. On the other hand, if the sheet is not in the first paper 
feeding means, the apparatus indicates that a sheet to be set in the 
second paper feeding is required through the indication means. 
Alternatively, an apparatus, having an area assignation means and an image 
forming means described above, a paper feeding means having a plurality of 
paper feeding units and a second selection means which are previously 
described, further includes a first and second sheet size designating 
means, instead of the foregoing means, wherein the first means designates 
a first copy paper size which corresponds to the assigned area and the 
second means designates a second copy paper size when there is no copy 
paper sheet with the first size in the paper feeding means. In the case of 
the apparatus constructed above, there is no more need of the indication 
means previously described since the second size, for example one rank-up 
size of the first size, of the copy paper sheet is automatically selected 
if there is no copy paper sheet with the first size in the paper feeding 
means. 
Further alternatively, in carrying the present invention in one preferred 
mode, an apparatus comprises: an area assignation means for assigning an 
optional area in an original on a document platen; an image forming means 
capable of forming an image of the original with a first mode and a second 
mode, the first mode representing to form the image of the whole original 
and the second mode representing to form the image of the assigned area in 
the original; a selection means for selecting one of the first and second 
modes; a paper feeding means including a plurality of paper feeding units, 
each of which accommodates copy paper sheets, for automatically feeding 
the copy paper sheet therein to the image forming means one by one in 
response to a signal of paper feeding; a sheet size designating means for 
designating a copy paper size which corresponds to the assigned area when 
the second mode is selected; and a control means for controlling the 
apparatus so as to cancel the second mode when there is no copy paper 
sheet with the designated size in the paper feeding units. If there is no 
copy paper sheet with the designated size in the paper feeding units, the 
second mode is cancelled, so that incomplete copying such as copying with 
lack of the image can be effectively prevented. Therefore, on the occasion 
of the copying operation with selection of this copy mode, it is not 
necessary for an operator to decide a size of the copy paper sheet to be 
used, resulting in that the operation time is reduced.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
Before the description of the embodiment proceeds, it is to be noted that 
like parts are designated by like reference numerals and symbols 
throughout the several views of the accompanying drawings. 
Copying Mechanism 
Referring now to the drawing of FIG. 1, there is shown an 
electrophotographic copying machine to which the present invention is 
applicable comprising an optical system 400, an image forming system 500, 
an automatic paper feeding device 600 and a manual paper feeding device 
650. The optical system 400 is disposed at an upper portion of a machine 
housing 300 and the image forming system 500 is disposed at a lower 
portion of the machine housing 300. Further, the automatic paper feeding 
device 600 and the manual paper feeding device 650 are, respectively, 
disposed at a left-hand portion of the machine housing 300. 
The optical system 400 is designed in such a manner that an original 
positioned on a transparent original support glass 16 is exposed and 
scanned so that a reflected light image of the original is focussed on an 
outer surface of a photosensitive drum 1 which is one of members of the 
image forming system 500. More specifically, the optical system 400 
comprises a fluorescent lamp 3 for exposing, a plurality of movable 
mirrors 11, 12, 13 and 15, and a projector lens assembly 14. The exposure 
lamp 3 and the movable mirror 11 and both of mirrors 12 and 13 are adapted 
to be driven by a motor M3 in such a way that both of the exposure lamp 3 
and the mirror 11 and both of the mirror 12 and 13 can be moved leftwards, 
as viewed in FIG. 1, at a speed of V/N and V/2N, respectively, wherein V 
represents the peripheral velocity of the photosensitive drum 1 and N 
represents a magnification. These members 3, 11, 12, 13 travel underneath 
the original glass 16 in both directions so that the original on the glass 
16 may be exposed and scanned. Setting of the magnification and correction 
of focussing are carried out by position adjustment of both the lens 
assembly 14 and the mirror 15 and angle adjustment of the mirror 15, 
respectively. It is to be noted that these adjustment are effected by 
driving of a motor M4. In addition, reference numerals SW50 and SW51 
designate sensors for detecting positions of the movable elements of the 
optical system 400. 
The image forming system 500 is a system by which an image formation under 
a so-called electrophotographic processing is performed. In other words, 
the system 500 is designed in such a way that an electrostatic latent 
image formed on the photosensitive drum 1 is developed by toner and is 
transferred onto a copy paper sheet and fixed thereon, then the copied 
sheet is discharged. 
The image forming system 500 comprises the photosensitive drum 1 supported 
at a generally central position within the machine housing 300 for 
rotation in a direction counterclockwise as viewed in FIG. 1. The system 
500 further comprises eraser lamps 2 and 4, electrostatic chargers 3 and 
5, a developing device 6 which is driven by a motor M2, a transfer charger 
7, a separator charger 8 and a cleaning device 9, all of which are 
disposed adjacent to and around the drum 1. Furthermore, the unit 500 
comprises a transporting belt 27 for transporting the copy paper sheet on 
which the image is transferred, a fixing device 28 for fixing a toner 
image on the copy paper sheet which is transported by the belt 27 and a 
pair of rollers 29, 29 for discharging the copy paper sheet which has been 
fixed from the image forming system 500. 
It is to be noted that a reference numeral 73 designates a pair of timing 
rollers by which the copy paper sheet to be fed is supplied to a spacing 
between the drum 1 and the transfer charger 7 at a predetermined timing as 
well as in synchronism with a rotation of the drum 1, and a symbol M1 
designates a main motor. 
The automatic paper feeding device 600 has two independent paper feeders 
600A and 600B, one 600A of which comprises a first paper feeding tray 20, 
a first feeding roller 771 and two pairs of guide rollers without a 
reference numeral, and the other 600B of which comprises a second paper 
feeding tray 22 and a second feeding roller 721. The first, and second 
trays 20, 22 accommodate copy paper sheets the sizes of which are 
different from each other. The sheets in each tray 20 and 22 are drawn by 
the corresponding feeding roller 771 or 721, sequentially, then the sheets 
are fed to a pair of timing rollers 73 disposed in the image forming 
system 500. After that, the sheets are supplied to the spacing between the 
drum 1 and the transfer charger 7 in synchronism with a rotation of the 
drum 1 in response to a predetermined timing signal from a control unit 
201 (FIG. 6) for controlling the optical system 400, then the 
abovedescribed image formation processing is effected. Under the 
respective trays 20, 22, a group of sensors 601, to 604, 605 to 608 is 
disposed, each of which is provided for detecting a size of the copy paper 
sheet accommodated therein. 
Moreover, the copying machine has another paper feeding means by which a 
sheet to be set manually thereon is fed to the image forming system 500. 
That is, a manual paper feeding device designated by the reference numeral 
650 is disposed above the automatic paper feeding device 600. The copy 
paper sheet to be set on the manual paper feeding device 650 is detected 
by a first sensor MP1 and its transportation is detected by a second 
sensor MP2. These sensors MP1 and MP2 are arranged at suitable positions 
for detecting the sheet. That is, the first sensor MP1 is disposed in 
front of a pair of paper feed rollers 750, 750 arranged close to an inlet 
for manual paper feeding in the housing 300. The second sensor MP2 is 
disposed behind the paper feed rollers 750, 750. 
Control Apparatus 
The manner in which various operation keys are arranged in an operation 
panel 9 of the copying machine is illustrated in FIG. 2. The copying 
machine according to the present invention has a function of editing. 
There are arranged an edition area displaying board 910 for indicating a 
edition area, an edition mode key 960 for ordering edition mode setting 
and a edition mode indication LED 960a for indicating that a mode is set 
to the edition mode, on the left side of the panel 9 as viewed in the 
drawing. On the panel 9, there are further arranged a key 96 for 
sequentially assigning inputted data of a co-ordinate for editing to each 
co-ordinate A,B,C,D on the edition area displaying board 910 and inputted 
co-ordinate indication LEDs 96a to 96d for indicating co-ordinates 
assigned thereby. Keys designated by numeral references 991 to 998 are for 
making fine adjustment of the inputted data of co-ordinates for editing. 
At a central portion on the operation panel 9, there are further arranged a 
book mode key 91 for ordering book mode setting, an indication LED 91a for 
indicating that a mode is set to the book mode, magnification keys 100, 
101, 102, and 103, which represent .times.0.707-magnification, 
.times.0.865-magnification, .times.1.414-magnification, and 
.times.1.000-magnification respectively, for inputting a copy 
magnification to be desired, indication LEDs 100a to 103a for indicating 
the copy magnification inputted by the respective keys 100 to 103 
described above, a copy paper selecting key 92 for selecting one of the 
automatic paper feeders 600A and 600B, copy paper size indication LEDs 92a 
to 92d for indicating a size of the copy paper sheet which is accommodated 
in the selected automatic paper feeder 600A or 600B, and an indication LED 
92e of manual paper feeding for indicating a request of performing paper 
feeding from the manual paper feeding device 650. 
There are still further arranged, at a right-hand portion on the operation 
panel 9, a digital display device 900 capable of displaying a copy 
quantity or the copy magnification with a numerical figure comprised of up 
to four digits, a print key 90 for initiating the copying operation, a 
group of numerical input keys 94, i.e., a so-called ten keys, for 
inputting numerical data of the copy quantity or data of the co-ordinates, 
density setting keys 931 and 932 for setting a copy density, an 
interruption key 982 for specifying an interrupted copying operation, and 
a clear/stop key 981. 
The drawing of FIG. 3 is a perspective view showing an inter-image eraser 
unit 40 which is disposed adjacent to the photosensitive drum 1 and the 
drawing of FIG. 4 is a diagram showing a mechanism of erasing charges 
which correspond to the designated area on the drum 1 by the inter-image 
eraser unit 40. As shown in the drawings, the inter-image eraser unit 40 
has a LED-array which comprises a lot of LED elements individually 
controllable to be caused to be on or off individually. The unit 40 
removes charges of the corresponding area on the drum 1 by emitting the 
LED-elements with a predetermined light quantity from the LED elements, 
wherein the LED-elements correspond to the area where an image formation 
is not carried out. For example, as shown in FIG. 4, it is assumed that 
the array includes the LED-elements of a number of N+1 and different 
symbols, e.g., 0, A, B, . . . , N, are given to respective LED-elements 
from the left-hand side of the line. All of the LED-elements are caused to 
be on until time-up time of a timer XA, then, from the time-up time of the 
timer XA until time-up time of a timer XB, the LED-elements having the 
symbols 0 to C and D to N are caused to be on. After that, all of the 
LED-elements are caused to be on from the time-up time of the timer XB. In 
case where such an operation is effected, an electrostatic latent image 
can be formed only in the area with an oblique line in FIG. 4. 
Accordingly, the image formation is not effected in an area out of the 
above-mentioned area. 
The drawing of FIG. 5 is a view showing the copying operation under the 
book mode. In this mode, two original documents set on the document platen 
glass 16 adjacent to each other are reproduced onto an individual copy 
paper sheet. For example, when a book shaped original document BO is set 
on, the platen glass 16 in an open state and the print key 90 is 
depressed, the reflection mirror 12 moves from its home position (H) to 
its return position (R), first. During this operation, an original image 
of an area away from the home position (H) is reproduced onto a first copy 
paper sheet. Subsequently to the above, the reflection mirror 12 returns 
to the home position (H) from the return position (R) once, and then the 
reflection mirror 12 moves from the home position (H) to a middle position 
(M) of the document again. During this operation, an original image of an 
area close to the home position (H) is reproduced onto a second copy paper 
sheet. 
Referring now to FIG. 6, there is shown a control circuit for controlling 
an operation of the copying machine and the optical system. The control 
circuit is mainly constructed with a first CPU 201 controlling the image 
forming system 500 and paper feeding, and a second CPU 202 controlling the 
optical system 400. 
Various kinds of signals from the respective keys on the operation panel 9 
and the respective sensors disposed therein for detecting the operating 
condition of the machine are inputted into the first CPU 201 through an 
input extended IC, respectively. Moreover, the first CPU 201 outputs 
control signals for controlling driving circuits for actuators disposed in 
the machine, such as the main motor M1, the developing motor M2, 
respective clutches(not shown), and chargers 3, 5, 7, 8, a control signal 
for controlling a driving circuit 400 of the inter-image eraser 40, and 
control signals for controlling driving circuits of LED-elements for 
indication and of the display unit 900 through an output extended IC. The 
first CPU 201 is connected with the second CPU 202 through a bus 400 and 
both CPUs 201, 202 are in communication with each other. Signals from the 
sensors SW50 and SW51, disposed in the optical system 400, for detecting a 
state of scanning and so on are inputted into the second CPU 202 and the 
CPU 202 outputs control signals for controlling driving circuits of the 
scanning motor M3 and the magnification setting motor M4. 
According to the drawing of FIG. 7 in which is shown an edited area 800 on 
the platen glass 16, the relationship between the edition area 800 to be 
copied and a copy paper size can be explained as below. That is, the 
edition area 800 as shown in the drawing is beyond the B5-sized area 
(shown by a dotted line) but within the A4-sized area (shown by another 
dotted line), wherein both sized areas are positioned sideways with 
respect to the paper feeding direction. In this case, therefore, the 
A4-sized sheet must be selected so that a complete copying without any 
lack of printed images may be fulfilled. As it is apparent from the 
description mentioned above, the size of the copy paper sheet can be 
designated univocally if the edition area is determined. 
Copying Operation 
In FIG. 8, there is shown a flow chart of a main routine executed by the 
first CPU 201. Before an explanation of the flow chart is performed, terms 
of "on-edge" and "off-edge" are defined as below. 
The on-edge is defined as a change of a state which happens when an 
operating state of a switch, a sensor, a signal, or so on changes from the 
off-state to the on-state. On the other hand, the off-edge is defined as a 
change of a state which happens when an operating state of a switch, a 
sensor, a signal, or so on changes from the on-state to the off-state. 
Now, going back to the explanation of the flow chart, the first CPU 201 
initiates processings when, for example, an electric power is supplied. At 
first, initialization of the first CPU 201 is made at step S1. Then, an 
internal timer by which a required time for one routine is controlled is 
set at step S3, and the processings at respective steps of step S5 to step 
S17 are executed sequentially. After that, the program waits at step S19 
until the timer is time-up. when the timer is time-up, the program returns 
to step S3. 
Hereinafter, the processings at the respective steps of step S5 to step S17 
are explained briefly. 
At step S5, one of a first and second paper feeding inlets is selected, 
wherein the first inlet is associated with the first paper feeding tray 20 
and the second inlet is associated with the second paper feeding tray 22. 
The detailed description of the processing is made later on. 
At step S7, one of the copy magnifications specified as .times.0.707, 
.times.0.865, .times.1.414, and X 1.000 is selected for a current copying 
operation. In addition, the copy paper sheet corresponding to the selected 
magnification is automatically selected as well. The detailed description 
of the processing is made later on. 
At step S9, an optimum copy paper size is automatically selected when the 
edit. copy mode is selected by the input operation of the key 960. The 
detailed description of the processing is made later on. 
At step S11, a processing corresponding to an operation of the book copy 
mode is made when the book mode key 91 is operated. The detailed 
description of the processing is made later on. 
At step S13, the LED-elements of the inter-image eraser unit 40 are 
controlled to be on or off with the timers XA and XB. The detailed 
description of the processing is made later on. 
At step S15, the copying operation is controlled. The detailed description 
of the processing is made later on. 
At step S17, other processings such as inputting of the copy quantity with 
the ten-key 94 and controlling the driving circuit of the numerical 
display unit 900 are executed. The detailed description in connection with 
the above is omitted here since these processings are well-known in the 
art. 
Next, a flow chart of a main routine executed by the second CPU 202 is 
explained according to the drawing of FIG. 16. The second CPU 202 
initiates processings when, for example, an electric power is first 
supplied. Subsequently, initialization of the second CPU 202 is made at 
step S701. Then, an internal timer by which a required time for one 
routine is controlled is set at step S703, and the processings at 
respective steps of step S705 to step S707 are executed sequentially. 
After that, the program waits at step S709 until the timer is time-up. 
When the timer is time-up, the program returns to step S703. Hereinafter, 
the processings at the respective steps of step S705 to step S707 are 
explained briefly. 
At step S705, a moving amount and direction of the lens assembly 14 are 
controlled in response to a signal of setting the copy magnification, 
wherein the signal is outputted from the first CPU 201. The processing of 
setting the magnification is well-known in the art, so the detailed 
description of that is omitted, here. 
At step S707, a scanner is controlled in response to a scanning signal 
outputted from the first CPU 201. This processing is well-known as well, 
so the detailed description of that is omitted, here. 
The copying machine embodying the present invention has two CPUs 201 and 
202. The communication between the two 201 and 202 is effected as follows. 
The communication with the first CPU 201 is effected by a processing at 
step S715 of a sub-routine for interruption as shown in FIG. 17 in 
response to an interruption demanding signal outputted from the first CPU 
201, regardless of the execution of the processing of the main routine by 
the first CPU 201. 
Referring now to the drawings of FIG. 9 to FIG. 15, there are shown 
respective sub-routines executed by the first CPU 201. The processing 
(paper selecting) at step S5 of FIG. 8 is shown in FIG. 9. In the drawing, 
it is decided at step S101 whether or not the copying is in operation. 
When decided that not in operation, the program goes to step S103. When 
the on-edge of the paper selecting key 92 is detected at step S103, the 
copy paper sheet accommodated in either the first or second trays 20, 22 
is selected at step S105. Namely, when it is detected at step S105 that 
the first paper feeding tray 20 is selected as well as decided that the 
key 92 is the on-edge at step S103, the second paper feeding tray 22 is 
selected and a size of the copy paper sheet accommodated in the second 
tray 22 is detected by the paper size sensors 605 to 608 and its data is 
inputted into the first CPU. 201 at step S107. Meanwhile, when it is 
detected at step S105 that the second paper feeding tray 22 is selected as 
well as decided that the key 92 is the on-edge at step S103, the first 
paper feeding tray 0 is selected and a size of the copy paper sheet 
accommodated in the first tray 20 is detected by the paper size sensors 
601 to 604 and its data is inputted into the first CPU. 201, at step S109. 
And one of the paper size indication LEDs 92a to 92d is turned on at step 
S111. Namely, if the A3-size is detected, the LED 92a is turned on. 
Similarly, the B4-size to the LED 92b, the A4-size to the LED 92c, and the 
B5 to the LED 92d. 
FIG. 10 is a flow chart showing the processing (magnification selection 
routine) executed at step S7 of FIG. 8. This sub-routine is effected when 
the machine is not in copying operation. Namely, it is decided at step 
S201 whether or not the machine is in copying operation. when the machine 
is in copying operation, the program returns. If the machine is not in 
copying operation, the program goes to step S203. In the case where the 
on-edge of either of the magnification selecting keys 100, 101, and 102 is 
detected at step S203, the copy paper sheet is automatically selected, the 
size of which is corresponding to the inputted magnification. The 
relationship between the size and the magnification is as per Table 1 
listed below. 
TABLE 1 
______________________________________ 
Magnification Paper size 
______________________________________ 
0.707 A4 
0.865 B4 
1.000 -- 
1.414 A3 
______________________________________ 
In Table 1, the reason of correspondence of the 0.707-magnification to the 
A4-size is that the magnification: .times.0.707 is used at the reduction 
copying from the A3-sized document to the A4-sized copy paper sheet. 
Similarly, the reason of correspondence of the 0.865-magnification to the 
B4-size is that the magnification: .times.0.865 is used at the reduction 
copying from the A3-sized document to the B4-sized copy paper sheet. Still 
further, the reason of correspondence of the 1.414-magnification to the 
A3-size is that the magnification: .times.0.707 is used at the enlargement 
copying from the A4-sized document to the A3-sized copy paper sheet. 
When the on-edge of the magnification selecting key 100 is detected at step 
S203, the indication LED 100a corresponding to this key 100 is turned on. 
Then, the paper size corresponding to the magnification: .times.0.707, 
i.e., the A4-size, is automatically designated at step S207, and the 
numerical value of the magnification: .times.0.707 is transmitted to the 
second CPU 202, at step S209, as a signal converted into a magnification 
setting signal. After that, at step S233, execution of the sub-routine 
"sheet size searching" which is described later on is made and the program 
returns. 
When the on-edge of the magnification selecting key 101(magnification: 
.times.0.865) or 102(magnification: .times.1.414) is detected at step S211 
or S219, a similar procedure to that in the case of the key 100 is 
executed at the steps from step S213 to step S217 or from step S221 to 
step S225. Consequently, the B4-size and the A3-size are automatically 
designated, respectively during the executions, as previously described. 
It is to be noted that the magnification selecting key 103 is a key for 
the even-magnification(.times.1.000) so that the paper size may not be 
designated univocally. Therefore, there is no execution of designating the 
paper size and the sub-routine "sheet size searching" carried out with the 
execution of that is not called. The program returns directly after the 
execution of a signal transmission on the magnification to the second CPU 
202 at step S231. 
FIG. 11 is a flow chart showing the processing (edition copy selection 
routine) executed at step S9 of FIG. 8. That is, when it is detected at 
step S301 that the on-edge of the selection key 960 for the edition copy 
mode, it is detected at step S303 whether or not the indication LED 960a 
is on, i.e., the edition copy mode has been already set on detecting the 
on-edge. When the LED 960a is on, the LED 960a is turned off at step S305, 
so that the edition copy mode is cancelled, then the program returns. On 
the contrary to the above, in case where it is detected at step S301 that 
the on-edge of the key 960 as well as it is detected at step S303 that the 
LED 960a is off, i.e., the edition copy mode has not yet been set, the LED 
960a is turned on at step S307. Thus, the edition copy mode is set. After 
that, the minimum paper size capable of covering the edited image area 
determined in advance without lack of the printed image is automatically 
designated at step S309, wherein the edited image area has been specified 
by another manner. After designating the paper size, the execution of the 
sub-routine "sheet size searching", which is described below, is made at 
step S311 and the program returns. 
FIG. 12 is a flow chart showing the sub-routine "sheet size searching" 
which is called in the sub-routine of the processing of the edition copy 
selection routine described above and the book mode copying routine which 
is described later on. In this routine, at first, one of the paper feeding 
trays 20, 22 of the automatic paper feeding device 600 is selected, which 
accommodates the copy paper sheets having the size which is automatically 
designated by the above-mentioned routines. 
Namely, in case where it is detected at step S1001 that the copy paper 
sheets, the size of which is automatically designated, are accommodated in 
the first tray 20 which is mounted at the first paper feeding inlet, the 
program goes to step S1003 and the first paper feeding tray 20 is selected 
at step S1003. On the other hand, if it is detected at step S1001 that no 
copy paper sheets of that size are in the first tray 20 and it is detected 
at step S1005 that the above-mentioned copy paper sheets are accommodated 
in the second tray 22 mounted at the second paper feeding inlet, the 
second paper feeding tray 22 is selected at step S1007. In addition, at 
step S1009, the indication LED (one of LEDs 92a, 92b, 92c, and 92d) for 
indicating the size, designated automatically, of the copy paper sheet is 
turned on whereby operators can confirm completion of the automatic paper 
selection. 
Meanwhile, in case where the copy paper sheets having the size which is 
automatically designated are not able to be fed from neither the first nor 
second paper feeding tray 20, 22, i.e., it is detected at step S1001 and 
S1005 that no sheets of that size are in either tray, the program goes to 
step S1011. At step S1011, the indication LED 92e for indicating a request 
of feeding a copy paper sheet manually is made to flicker whereby, 
operators are urged so as to carry out the copying operation with manual 
paper feeding. In addition to the above, the paper size indication LED 
(one of LEDs 92a, 92b, 92c, and 92d) corresponding to the designated size 
described above is made to flicker at step S1013. In this way, operators 
can recognize the size of the copy paper sheet to be fed. After completion 
of the processing described above, the program returns to the original 
sub-routine by which the above-mentioned sub-routine is called. 
FIG. 13 is a flow chart showing the processing (book mode copying routine) 
executed at step S11 of FIG. 8. The processing shown by the flow chart is 
effected in response to the operation of the book mode key 91. As 
disclosed in U.S. Pat. No. 4,017,173, the book mode represents that each 
of two originals set on the platen glass, such as a book which is opened 
and the like, is reproduced on an individual copy paper sheet. 
At first, in case where it is detected at step S403 that the book mode has 
been already set, i.e., the indication LED 91a is on, when the on-edge of 
the the book mode key 91 is detected at step S401, the program goes to 
step S405 and the book mode is reset at step S405, so that the LED 91a is 
made off. Then, so as to inform the second CPU 202 that the book mode is 
under an off-state, a signal for copying an A-side (the A-side represents 
a side close to a regular position of the scanner; that is, the right-hand 
portion on the platen glass shown in FIG. 1.) is generated as "1" and 
transmitted to the second CPU 202 at step S407, besides a signal for 
copying a B-side (the B-side represents a side far from the regular 
position of the scanner; that is the left-hand portion on the platen glass 
shown in FIG. 1.) is generated as "0" and transmitted to the second CPU 
202 at step S409. 
Meanwhile, in case where it is detected at step S403 that the book mode is 
under the off-state, i.e., the indication LED 91a is off, when the on-edge 
of the the book mode key 91 is detected at step S401, the program goes to 
step S411 and the book mode is set at step S405, so that the LED 91a is 
made on. Then, so as for the second CPU 202 to make the B-side to be 
scanned at first, the signal for copying the A-side is generated as "0" 
and transmitted to the second CPU 202 at step S413, besides the signal for 
copying the B-side is generated as "1" and transmitted to the second CPU 
202 at step S415. Further, the A4-size as the paper size is automatically 
designated at step S417, and the sub-routine "sheet size searching" is 
called at step S419. After completion of the processings described above, 
the program returns to the main routine. 
Referring now to the drawing of FIG. 14, there is shown a flow chart for 
controlling the inter-image eraser unit 40. The controlling is effected as 
follows. At first, it is detected at step S501 that the detecting sensor 
SW51 for detecting a timing when a front end of the image of the original 
which is scanned by the scanner is focused on the photosensitive drum 1 
turns to the on-edge. When the on-edge of the detecting sensor SW51 is 
detected at step S501, the program goes to step S505 and all LEDs 
comprised of the inter-image eraser unit 40 are turned on at step S505. 
Further, the timer XA is caused to start at step S509, wherein the timer 
XA provides the time necessary for the scanner to reach a front end of the 
edition area for editing the original image (the time is 0 when the 
edition copy mode is off). Further, the timer XB is caused to start at 
step S511, wherein the timer XB provides the time necessary for the 
scanner to reach a rear end of the edition area for editing the original 
image (the time is a completion time of the scanning to the designated 
paper size when the edition copy mode is off). When it is detected at step 
S513 that the timer XA is time-up, the LEDs of the inter-image eraser unit 
40, disposed therein correspond to the zone between the left-hand and 
right-hand edges of the edition area of the original image (refer to the 
FIG. 4; the LEDs with the symbol of C to D), are turned off at step S517. 
Whereby, it is enabled to form the electrostatic latent image only in the 
zone (symbol C to symbol, D shown in FIG. 4) therebetween. After that, 
when it is detected at step S521 that the timer XB is time-up, all LEDs of 
the eraser unit 40 are turned on at step S525. By the execution of the 
processings described above, only the area shown by the oblique lines in 
FIG. 4 has the latent image. After the execution of all processings 
described above, the program returns to the main routine. 
FIGS. 15A to 15D are flow charts which are divided from one flow chart 
showing the sub-routine (copying operation routine) executed at step S15 
of the main routine (FIG. 8), respectively. At steps from step S601 to 
step S613 of FIG. 15A, a flag for initiating the copying operation is set. 
That is, when it is detected at step S601 that the print switch 90 is the 
on-edge, the initiation flag of copying is set at step S603. Whereby, the 
copying operation using the copy paper sheets accommodated in the first 
and second trays 20 and 22 is ready. On the other hand, when the on-edge 
of the switch 90 is not detected at step S601, the program goes to step 
S605. Namely, regarding the copying operation using the copy paper sheet 
set in the manual paper feeding device 650, the following procedures are 
taken. At first, it is decided at step S605 whether or not the copy paper 
sheet is detected by the sensor MP1 which is disposed in front of a pair 
of the paper feed rollers 750 arranged close to the inlet of the manual 
paper feeder. If the copy paper sheet is detected at step S605 by the 
sensor MP1, a clutch (not shown) of the manual feed roller 750 is turned 
on at step S607, whereby feeding of the copy paper sheet is initiated. 
After that, when the copy paper sheet moves ahead and has passed through 
the sensor MP1, the sensor MP1 gets into the off-edge, and then the 
program goes to the step S609. At step S609, it is decided whether or not 
the copy paper sheet is detected by the sensor MP2 which is disposed 
behind the paper feed roller 750. When the copy paper sheet is detected at 
step S609 by the sensor MP2, the clutch of the paper feed roller 750 is 
turned off at step S611, and then the initiation flag of copying is set at 
step S613. The location of the sensor MP2 is so considered that the 
transportation of the copy paper sheet into the copying machine may be 
smooth and stable. 
At steps from step S615 to step S633 of FIG. 15B, processings of a first 
stage of the copying operation are executed after setting the initiation 
flag of copying. Namely, at step S615, it is decided whether or not the 
initiation flag is set. When decided at step S615 that the flag is set, 
the program goes to step S617 and the main motor M1, the developing motor 
M2, the charger 3, and the transfer charger 7 are, respectively, turned on 
as well as the initiation flag is reset and a timer T-A and a timer T-B 
are set at step S617. Further, At step of S619, S623, or S620, one of the 
automatic paper feeders, i.e., the first or second automatic paper feeders 
600A, 600B, or the manual paper feeding device 650 is selected, wherein 
the selection is effected by the processings of the sub-routine "sheet 
size searching" (refer to FIG. 12). Namely, if the first tray 20 is 
internally selected, the program goes to step S621 via step S619. If the 
second tray 22 is internally selected, the program goes to step S625 via 
step S619 and step S623. If there are no paper with the designated size in 
both trays 20 and 22, it is so designed that the manual paper feeding 
device 650 is selected. In this case, therefore, the program goes to step 
S624 via step S619, step S623, and step S620. At respective steps of step 
S621, S625, and S624, clutches (not shown) of the first and second paper 
feed rollers 771 and 721 and manual paper feed roller 751 are, 
respectively, turned on. After that, the program waits at step S627 until 
the timer T-A is time-up. When the timer T-A is time-up, the program goes 
to step S629 and the clutch of either the first or second paper feed 
roller 771 or 721 which is in operation is turned off at step S629. Then, 
the program waits at step S631 until the timer T-B is time-up. When the 
timer T-B is time-up, the program goes to step S633 and a signal for 
scanning is generated and outputted to the second CPU 202 at step S633. 
At steps from step S635 to step S641, the following processings are carried 
out in response to a timing signal transmitted from the second CPU 202, 
wherein the timing signal is generated at the time when the scanner 
reaches a position located predeterminedly with respect to the original 
image, as described later on. At first, it is decided whether or not the 
timing signal is generated. Namely, it is detected at step S635 that the 
timing signal from the second CPU 202 is generated. When it is detected at 
step S635 that the on-edge of the timing signal, the program goes to the 
step S637, and a clutch (not shown) of the timing roller 73 is turned on 
as well as a timer T-C is set at step S637. Then, the program waits at 
step S639 until the timer T-C is time-up. When the timer T-C is time-up, 
the program goes to step S641, and the charger 3 and the clutch of the 
timing roller 73 are turned off as well as the scanning signal is reset at 
step S641. 
At steps from step S643 to step S667 of FIG. 15C, the following processings 
are carried out in response to a return signal transmitted from the second 
CPU 202, wherein the return signal is generated at the time when the 
scanner reaches its turning point, as described later on. When it is 
detected at step S643 that the return signal is on-edge, it is decided at 
step S645 whether or not multi-copying is completed. In case where it is 
decided at step S645 that the multi-copying is not completed, the program 
goes to step S665, and the initiation flag for copying is set at step S665 
and then a continuous copy flag is set at step S667, whereby the copying 
operation is effected continuously. On the other hand, in case where it is 
decided at step S645 that the multi-copying is completed, it is detected 
at step S647 whether the indication LED 91a for indicating that the book 
mode copy is selected is on or off, Then when it is detected at step S647 
that the LED 91a is off, i.e., the operation mode is not the book copy 
mode, the program goes to step S655, and the continuous copy flag is reset 
at step S655, then the program goes to step S669 of FIG. 15D. 
Meanwhile, when it is detected at step S647 that the LED 91a is on, in 
other words, the mode is the book mode, the program goes to step S649, and 
it is decided at step S649 whether or not the signal for copying the 
A-side of the book shaped document is generated. When it is decided at 
step S649 that the A-side copy signal is not generated, i.e., it is "0", 
the program goes to step S657. This means that a copying operation 
effected directly before is a last copying operation to the B-side of the 
document. Accordingly, the signal for copying the B-side to be transmitted 
to the second CPU 202 is reset at step 657, and the A-side copy signal is 
set to "1" at step S659, whereby a stand-by state of copying to the A-side 
is established. Further, the initiation flag (F) is set to "1" at step 
S661, and the continuous copy flag is set to "1" at step 663, whereby the 
copying operation is effected continuously. 
In case where it is decided at step S649 that the A-side copy signal is 
generated, i.e., it is "1", the program goes to step 651. This means that 
a copying operation effected directly before is a last copying operation 
to the A-side of the document. In other words, all copying operation which 
was set is completed. Accordingly, the A-side copy signal is reset to "0" 
at step S651, and the B-side copy signal is set to "1" at step S653, then 
the continuous copy flag is reset at step S655. After that, the program 
goes to step S669 of FIG. 15D. 
At steps from step S669 to step S677 of FIG. 15D, processings of a last 
stage of the copying operation are executed. That is, it is decided at 
step S669 whether or not the continuous copy flag is set to "1". When it 
is decided at step S669 that the flag is reset to "0", it is decided at 
step S671 whether or not a signal on a standard position of the scanner 
from the second CPU 202 is generated. If it is detected at step S671 that 
the on-edge of that signal, the developing motor M2 and the transfer 
charger 7 are turned off as well as a timer T-D is set at step S673. When 
it is detected at step S675 that the timer T-D is time-up, the main motor 
M1 is turned off at step S677, and results of the foregoing processings 
are outputted at step S679. Then, the program returns to the main routine. 
Hereinafter, processings executed by the second CPU 202 are described. At 
first, scanning processings are explained. FIG. 18A and 18B are flow 
charts which are divided from one flow chart showing the sub-routine 
(scanning processings routine) executed at step S707 of the main routine 
shown in FIG. 16 by the second CPU. The scanning by the scanner is 
initiated at step S803 under the condition that it is detected at step 
S801 that the on-edge of the scanning signal is outputted from the first 
CPU 201. Subsequently, it is decided at step S805 whether or not the 
operation mode is the book copy mode. If it is decided at step S805 that 
the mode is not the book copy mode, the program goes to step S809, and 
when it is detected at step S809 that the on-edge of the sensor SW51, a 
timer T-1 and a timer T-2 are, respectively, set at respective steps S811 
and S813. Namely, the timers T-1 and T-2 are initiated at the time when 
the scanner reaches a standard position located predeterminedly with 
respect to the original image. The timer T-1 is set to a required time 
necessary for the scanner to reach the front end of the original image in 
the scanning direction, while the timer T-2 is set to a required time 
necessary for the scanner to reach its turning point. On the occasion of 
setting the foregoing times, a moving speed of the scanner is taken into 
account. After that, the program waits at step S815 until the timer T-1 is 
time-up. When the timer T-1 is time-up, the timing signal is generated at 
step S817, and the program goes to step S819. At step S819, the program 
waits until the timer T-2 is time-up, then the movement of the scanner in 
the forward direction is caused to stop as well as the return signal is 
generated at step S821 when the timer T-2 is time-up. After that, the 
program goes to step S841. 
Meanwhile, in case where it is decided at step S805 that the mode is the 
book copy mode, the program goes to step S807, and it is decided at step 
S807 whether or not the A-side signal is set to "1". If it is decided that 
the A-side signal is set to "1", i.e., the copying machine is under the 
state ready for copying the A-side of the original, the program goes to 
step S809. And the processings same as the above-mentioned are effected 
from step S809 to step S821. But a setting time of the timer T-2 is given 
by a time corresponding to a paper sheet length of the original on the 
A-side. 
In case where it is decided, as a result of step S807 described above, that 
the A-side signal is reset to "0", i.e., not under the state ready for 
copying the A-side of the original, the program goes to step S823 of FIG. 
18B and decision on the B-side signal is effected there. As a result of 
the decision at step S823, if it is decided that the B-side signal is set 
to "1", i.e., under the state ready for copying the B-side of the 
original, the program goes to step S825. The processing at step S823 is to 
decide whether or not the scanner reaches a standard position (located 
predeterminedly with respect of the original image of the B-side) for 
copying to the B-side. This standard position is located at the scanning 
end (the left side end) of the A-side original. It is decided at step S825 
whether or not scanning to the original image of the A-side is completed, 
wherein the paper sheet length and the copy magnification are taken into 
account for the operation of scanning. When it is decided that the 
scanning is completed, in other words, at the time when the scanner 
reaches the foregoing standard position, the timers T-1 and T-2 are, 
respectively, set at respective steps S827 and S829. The timer T-1 is set 
to a required time necessary for the scanner to reach the front end of the 
original image of the B-side against the scanning direction, while the 
timer T-2 is set to a required time necessary for the scanner to reach its 
turning point. After waiting at step S831 until the timer T-1 is time-up, 
the program goes to step S833, and the timing signal is generated there. 
Subsequently, after waiting at step S835 until the timer T-2 is time-up, 
the program goes to step S839, and the movement of the scanner in the 
forward direction (in the left-hand direction in FIG. 1) is caused to stop 
as well as the return signal is generated at step S839. Then, the program 
goes to step S841. If the scanner travels for scanning up to the maximum 
distance (420 mm; the position of the left-hand end up to which the 
scanner can travel in FIG. 1), the program goes to step S839 even though 
the timer T-2 is at work now. 
The processings at steps from step S841 to step S845 are processings for 
controlling the scanner moving in the backward direction so as to stop at 
its initial position. That is, under the condition that the sensor SW50 is 
the on-edge which is detected at step S841, the movement of the scanner in 
the backward direction is controlled to stop, resulting in that the 
scanner is positioned at its initial position, as well as the timing 
signal is reset to "0" and the standard position signal is set to "1" at 
step S843. If the decision made at step S841 is "NO", the standard 
position signal is kept in the off-state at step S845 until the decision 
changes from "NO" to "YES". The program returns to the main routine after 
execution of the above-mentioned processings. 
In the embodiment described above, the copying machine has a system 
controlling that the paper size is automatically designated, based on the 
data of the TABLE 1, on selection of the copy magnification. The data of 
the TABLE 1, however, are not the stationary ones. Namely, the data can be 
altered optionally upon the users' desire. For example, a TABLE 2 listed 
below may be applied instead of the TABLE 1. 
TABLE 2 
______________________________________ 
Magnification Paper size 
______________________________________ 
0.707 B5 
0.865 B5 
1.000 -- 
1.414 B4 
______________________________________ 
Further, it may be so designed that it is possible to select the TABLE 1 or 
the TABLE 2 by means of an operation of the ten-keys unit. For instance, 
when selecting the TABLE 1, an operator, depresses the key of the number 
"9" ten times, then he depresses the key of the number "1", resulting in 
that he gets the TABLE 1. Or when depressing the key of the number "2" 
after ten-times depression to the key of the number "9", the TABLE 2 is 
given to the operator. 
In the aforementioned embodiment, the copy paper sheet with the A4-size is 
automatically designated when the book copy mode is selected. Of course, 
however, it does not matter that the copy paper sheet with the B5-size is 
automatically selected at that time. 
Still further, when the copy paper sheets, the size of which is 
automatically designated in response to the selection of the copy 
magnification, the selection of the book copy mode, or the input of the 
edition area, are not in neither the first nor second trays, the back-up 
system to feed the sheet manually by the manual paper feeder is provided 
for the copying machine as is disclosed in the foregoing embodiment. 
However, there are other systems available. 
For example, as shown in FIG. 19, in case where it is detected at 
respective steps S1101, S1105 that the copy paper sheets, the size of 
which is automatically designated, are not set in neither the first nor 
second trays 20 or 22, the designated size is changed to a size with 
one-upper rank at step S1111. For instance, if the A4-size longitudinally 
positioned is designated, it is changed to the B4-size longitudinally 
positioned. Or, if the B4-size, longitudinally is designated, it is 
changed to A3-size longitudinally positioned, and so on. But, if the size 
which is changed at step S1111 exceeds the A3-size longitudinally 
positioned (which is a maximum size to be set in the copying machine), it 
is detected at step S1113. In such a case, the first tray is forcibly 
selected at step S1115, and the size of the copy paper sheet accommodated 
therein is indicated at step S1117. It is to be noted here that other 
steps except the above in the drawing have processings same as those in 
FIG. 12. After completion of the processings described above, the program 
returns to the original sub-routine (the copy magnification routine, or 
the book copy mode routine) by which the above-mentioned sub-routine is 
called. 
Furthermore, if the copy paper sheets, the size of which is automatically 
designated, are not in neither the first nor second trays 20, 22 on the 
edition mode, it does not matter that the edition mode may be reset. Such 
a control procedure is disclosed hereinafter. 
More specifically, as shown in FIG. 20, if it is detected at step 1001 that 
the copy paper sheets, the size of which is automatically designated, are 
in the first tray 20, the first tray 20 is selected at step S1003, while 
the second tray 22 is selected at step S1007 if it is detected at step 
1005 that the above-mentioned sheets are in the second tray 22. In 
addition, at step S1009, the indication LED (one of LEDs 92a, 92b, 92c, 
and 92d) for indicating the size, designated automatically, of the copy 
paper sheet is turned on whereby, operators can confirm completion of the 
automatic paper selection. Meanwhile, in case where the copy paper sheets 
having the size which is automatically designated are not in neither the 
first nor second tray 20, 22, i.e., it is detected at step S1001 and S1005 
that no sheets are in both trays, the program goes to step S1014. At step 
S1014, the indication LED 960a is turned off and the program prohibits the 
CPU from receiving an order of the edition mode. Accordingly, the copying 
machine is prohibited from copying under the edition mode when the optimum 
copy paper sheets are not available therein, resulting in that unsuitable 
copying is effectively avoided. 
Although the present invention has been fully described by way of example 
with reference to the accompanying drawings, it is to be noted, here, that 
various changes and modifications will be apparent to those skilled in the 
art. Therefore, unless otherwise such changes and modifications depart 
from the scope of the present invention, they should be construed as 
included therein.