Copying machine for selective reproduction of images

A copying apparatus capable of making a copy of selected area of a document achieves various procedure of partly copying in combination with an automatic document feeder capable of inverting the document, an area selecting mechanism with a block indication, an automatically magnification selecting mechanism, an automatically paper-size selecting mechanism, a duplex mechanism and a copy paper re-feeding mechanism.

BACKGROUND OF THE INVENTION 
The present invention relates to an electrophotographic copying machine, 
and more particularly to an electrophotographic copying machine for 
copying optional portions of documents on optional portions of copy paper. 
Usually copying machines copy the entire portion of an original as it is. 
However, there arises a need to copy only a portion of the original. In 
such a case, the portion of the original to be copied is usually cut off 
for copying, but this procedure is very inconvenient. 
To eliminate this inconvenience, various partial copying methods have been 
proposed. U.S. Pat. No. 4,068,948, for example, discloses a method wherein 
the unnecessary portion of the original is covered with two movable 
masking members before copying. In another method of partial copying, the 
charges on the photosensitive member are erased from the portion thereof 
corresponding to the unnecessary portion of the original. The charges on 
the photosensitive member are erased by an illuminating device which 
comprises an array of lamps arranged between the charger and the 
developing unit and opposed to the photosensitive member. This method is 
disclosed, for example, in Unexamined Japanese Patent Publication No. SHO 
No. 57-41671. 
What matters in a partial copying operation is how to specify the portion 
to be copied. According to Unexamined Japanese Patent Publication No. SHO 
57-56859, the portion of the orginal to be copied is surrounded by a 
marker of a color insensitive to the photosensitive member, and the area 
marked off is detected by a color sensor for controlling a charge erasing 
lamp array. However, this method has the objection that the original is 
colored with the marker. U.S. Pat. No. 4,256,400 discloses a method 
wherein cursors provided along two edges of a document support glass plate 
are used for specifying the portion to be copied. This method has the 
drawback that it is difficult to specify the desired portion since the 
original is placed on the glass plate face down. Unexamined Japanese 
Patent Publication No. SHO 58-43480 discloses a method which employs a 
document feeder (hereinafter referred to as "DF") having a transparent 
plate ruled into squares on its upper surface and in which the transparent 
plate is placed over the original to read the coordinates of the portion 
to be copied using the squares, and the coordinates are entered with 
numerical keys. The coordinate input system requires the cumbersome 
procedure of manipulating many keys and involves extreme difficulties in 
specifying areas other than simple square to rectangular areas. 
In conducting partial copying operations, it is desired to locate the 
partial copying area in a desired position on the copy paper. The 
above-mentioned Publication No. SHO 58-43480 includes the proposal of 
shifting the partial copying area on copy paper in the direction of 
transport thereof by adjusting the copy paper register timing and of 
shifting the area in a direction perpendicular to the transport direction 
by causing the DF to feed the original in the perpendicular direction to 
an adjusted position on the support glass plate. Nevertheless, in view of 
the relationship between the paper discharge tray of DF and the operation 
panel of the copying machine, this proposal is in conflict with the 
development of DF into an auto document feeder (hereinafter referred to as 
"ADF") for automatically copying a plurality of originals when the ADF is 
to be realized without making the overall apparatus large-sized. 
Further in partial copying, it is cumbersome to select an optimum copy size 
or magnification for the local copying area. It is also desired to effect 
such selection automatically. 
Another demand as to partial copying is directed to the processing of a 
plurality of partial copying areas. For example, when an original has two 
portions which are to be copied separately on two sheets of copy paper or 
on the front side and rear side of a single sheet of copy paper, the two 
portions conventionally need to be handled separately. Further for example 
when a single copy is to be made from two originals each having one 
portion to be copied, it has been necessary to process the two portions 
separately. 
SUMMARY OF THE INVENTION 
Accordingly, the main object of the present invention is to provide a 
copying machine having an improved partial copying function. 
Another object of the present invention is to provide a copying machine 
having a partial copying function and easy to use. 
Another object of the present invention is to provide a copying machine 
wherein the area to be copied partially can be specified easily. 
Another object of the present invention is to provide a copying machine 
wherein the area to be copied partially is shiftable on copy paper by 
means of simple construction. 
Another object of the present invention is to provide a copying machine 
which is adapted to automatically select a copy paper size or 
magnification suited to the specified area to be partially copied. 
Another object of the present invention is to provide a copying machine 
capable of automatically processing a plurality of areas to be copied 
partially. 
The apparatus for fulfilling the above objects consists essentially of an 
eraser array comprising a plurality of minute illuminating elements and 
arranged between a charger and a developing unit in opposed relation to a 
photosensitive drum, the illuminating elements being individually 
controllable for the emission of light to form partial images. The 
apparatus is in combination with the following mechanisms. 
Document Edition Mechanism 
This mechanism specifies the portion of an original to be copied and erases 
the area other than the specified area for copying operation and is termed 
also a partial copying mechanism. The mechanism includes means for 
specifying the desired area and means for erasing electrostatic latent 
images from the area other than the specified area. The area specifying 
means includes a transparent plate having checkered blocks printed thereon 
for covering the original for specifying the blocks over the required 
portion. The erasing means includes a plurality of light emitting elements 
arranged at a latent image forming station and opposed to the 
photosensitive drum. The light emitting elements are selectively caused to 
emit light to erase charges from the unnecessary portion. 
Copy Edition Mechanism 
This mechanism copies the specified area of the original as shifted on copy 
paper. Copy edition is effected in the direction of feed of copy paper 
(hereinafter referred to as "feed direction") and in a direction 
perpendicular to the feed direction (hereinafter referred to as 
"perpendicular direction") by different means. More specifically, the 
desired area is shifted in the feed direction by feeding copy paper 
earlier or later than the copy image on the photosensitive drum through 
the on-off control of a timing roller. The area is shifted in the 
perpendicular direction by feeding the copy paper manually and 
transporting the paper as shifted in the perpendicular direction relative 
to the copy image on the drum by shifting a manual paper feed table in the 
perpendicular direction. While the embodiment includes the above means in 
combination, the perpendicular shift can alternatively be realized by 
shifting the original itself in the perpendicular direction, or by 
shifting the projection lens in the perpendicular direction to project an 
image on the drum at an altered position. 
Auto Document Feeder 
By this feeder, the original is automatically fed to the document support 
surface and automatically discharged on completion of copying. When the 
original is double-faced, the original is further fed as turned upside 
down for copying the second surface. The auto document feeder, which is so 
called when it is an assembly separate from the copying machine, is also 
separate from the copying machine according to the embodiment of the 
invention. Although the construction of ADF itself is known, the feeder is 
so controlled according to the invention that the original is set in 
position face up, reversed within ADF and positioned on the document 
support surface, to simplify specification of the desired area of the 
original for automatic edition. This mode of control differs from the 
conventional control mode. 
Double-Face and Composite Copying Mechanism 
By this mechanism, copy paper bearing a copy image thereon is returned to 
the path of feed of paper, as reversed or as it is. The mechanism has a 
circulation path for returning the copy paper bearing a copy image on its 
one surface from downstream of a fixing unit to a paper feeder portion, a 
reverse portion for reversing the copy paper to position its leading end 
as the rear end and use the second surface for copying, a first 
change-over portion for selecting a paper discharge tray or the 
circulation path for further transport of the paper, and a second 
change-over portion for selecting circulation of the paper through the 
reverse portion or circulation not through the reverse portion. 
Automatic Edition Magnification Selection Mechanism 
For automatic magnification setting, this mechanism calculates an optimum 
magnification from the size of a specified area of the original and the 
selected paper size so as to accommodate the specified area on copy paper. 
A copying machine adapted to automatically calculate a magnification from 
the size of an original and the paper size for setting has been proposed 
by the present applicant in U.S. Pat. No. 4,575,227 issued on Mar. 11, 
1986, while in the case of the present invention wherein the specified 
areas are not approximately constant in shape and vertical-to-horizontal 
ratio unlike the size of originals, the vertical magnification and the 
horizontal magnification are individually calculated, and the smaller of 
the two is selected for the image of the specified area to be invariably 
accommodated on copy paper. 
Automatic Edition Paper Selection Mechanism 
According to the size of the specified area of the original and the 
selected magnification, this mechanism searches for a paper size 
sufficient to accommodate the specified area and automatically selects the 
paper feed portion accommodating paper of suitable size, if any. 
With the combination of the above mechanisms or components, the copying 
machine embodying the present invention is adapted for three kinds of 
edition which are called simple edition, composite edition and divided 
edition for the sake of convenience, in addition to the usual copying 
operation. 
"Simple edition" refers to copying of the image of a portion on a desired 
portion of a single sheet of copy paper. 
"Composite edition" refers to copying of the images of two portions on a 
sheet of copy paper, as positioned optionally on the paper and relative to 
each other. 
"Divided edition" means copying of the images of two portions of a single 
original separately on two sheets of copy paper or on the front and rear 
surfaces of a single sheet of copy paper, at desired positions on the 
paper. 
The size of a portion of the original is variable as desired according to 
the magnification setting, while the size of copy paper to be used is of 
course selectable. 
When the image of the portion specified for simple edition, as well as for 
divided edition, needs to merely be accommodated on paper, use of the 
automatic edition magnification selection mechanism or use of this 
mechanism in combination with the automatic edition paper selection 
mechanism makes it easy to accommodate the image approximately over the 
entire area of the paper. If the desired-magnification and paper size are 
to be selected with reference to a manual, the user must calculate the 
magnification from the size of image of the portion and the paper size, or 
the size of paper usable from the size of the image and the magnification. 
Whereas this procedure is very cumbersome, such calculation can be 
performed automatically by the combination of the above mechanisms, to 
provide a great convenience. 
Because the images of two portions are reproduced in a composite or divided 
form in composite edition and divided edition, the apparatus has two 
memory means for specifying these image areas individually, such that data 
as to the two fragmentary images is stored in the memory means before 
edition copying. 
These and other objects, advantages and features of the invention will 
become apparent from the following description thereof taken in 
conjunction with the accompanying drawings which illustrate a specific 
embodiments of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS 
In the following description, like parts are designated by like reference 
numerals throughout the several drawings. 
Embodiments of the present invention will be described below with reference 
to the drawings. 
FIG. 1 shows a copying machine embodying the invention. A photosensitive 
drum 1, drivingly rotatable counterclockwise, is disposed approximately in 
the center of the machine main body. Arranged around the drum 1 are a main 
eraser lamp 2, subsensitizing charger 3, suberaser lamp 4, main 
sensitizing charger 5, inter-image eraser lamp 400, developing unit 6, 
transfer charger 7, copy paper separating charger 8 and blade cleaner 9. 
The drum 1, having a photosensitive surface layer, is sensitized when 
passing by the eraser lamps 2, 4 and the sensitizing chargers 3, 5 and 
then exposed to an optical image from an optical system 10. 
The optical system 10 for scanning images of originals is provided below a 
document support glass plate 16 and comprises unillustrated light source, 
movable mirrors 11, 12, 13, a lens 14 and a mirror 15. While the drum 1 is 
driven at a peripheral velocity of v (constant irrespective of 
magnifications), the light source and the movable mirror 11 travel 
leftward at a velocity of v/m (where m is a copying magnification). The 
movable mirrors 12, 13 travel leftward at a velocity of v/2m. These 
movable optical components are driven by a d.c. motor M3. When giving an 
altered magnification, the lens 14 is moved on the optical path, and the 
mirror 15 is shifted and pivotally moved. Indicated at SW50 is a switch 
for determining the home position of the scanning system, and at SW51 a 
switch for giving register timing to the scanning system. 
Provided at the left side of the main body are A and B paper feeders 20, 22 
having paper feed rollers 21, 23, respectively. The path of transport of 
copy paper is provided with pairs of rollers 24, 25, pair of timing 
rollers 26, conveyor belt 27, fixing unit 28 and discharge rollers 29. 
The A paper feeder has size sensor switches 120 to 123, while the B paper 
feeder has size sensor switches 124 to 127. Paper sizes are expressed in 
codes afforded by combinations of binary outputs from each switch group. 
A timing roller front sensor SE1 for controlling the pair of timing rollers 
26 is disposed upstream of the pair 26 with respect to the transport of 
paper. 
A manual paper feeder 40 is disposed above the A paper feeder. Manually fed 
paper is passed between a pair of rollers 41 and led into the path of 
transport of paper for the A paper feeder at the pair of rollers 24. A 
sensor SE2 for detecting the manually fed paper is provided upstream of 
the pair of rollers 41. The manual paper feeder 40 is openable relative to 
the main body. A sensor SE3 mounted on a side wall of the main body 
detects the opening or closing of the manual feeder. 
As seen in FIGS. 2 and 3, the manual paper feeder 40 is shiftable 
perpendicular to the direction of feed of paper. The amount of shift from 
a reference position (FIG. 3A) is detectable by a sensor 44 from the 
amount of rotation of a pulse disk 43 which is rotated via a rack 41 and a 
pinion 44 (FIG. 3B). A fixed guide plate 45 and a movable guide plate 46 
are provided on the upper surface of the feeder 40 for limiting the 
position of paper to be fed manually. 
A double face unit 250 is disposed below and at the other side of the main 
body for double-face and composite copying. The double face unit 250 
includes a first change-over guide 251 movable by a clutch CL100 and a 
second change-over guide 252 movable by a clutch CL101. These guides are 
moved to select a path of travel of copy paper for usual single-face 
copying, double-face copying or composite copying. For double-face 
copying, the copy paper having a copy image formed on one surface is 
temporarily held on an intermediate tray 253, which is pivotally moved to 
the broken-line position in FIG. 1 by a clutch CL102 in response to a rear 
surface copying start signal, whereupon the paper is fed into the copying 
machine by a re-feed roller 254, whereby the paper is turned upside down 
with its leading end positioned as the rear end. 
For composite copying, the paper is sent directly into the machine main 
body by the clutch CL101 without being led onto the intermediate tray 253, 
and another copy image is formed on the same surface as the previous 
image. 
On completion of a copying operation, the copy paper is sent to a sorter 
280. 
An auto document feeder (ADF) 300 will be described with reference to FIGS. 
1 and 4. The ADF 300 comprises a document feed assembly, a transport 
assembly 302 and a reverse assembly 303. The document feed assembly has a 
tray 301, an area plate 311 and feed roller 312. The area plate 311 is 
made of a transparent material and has printed on its upper surface a 
checkered pattern and area numbers. The transport assembly 302, which is 
positioned above the document support glass plate 16, has a document 
conveyor belt 320, a discharge path for delivering documents onto a 
discharge tray 321, and a change-over guide 322 for directing the document 
or original toward the discharge path or the reverse assembly 303. The 
belt 320 transports the document to a specified position on the glass 
plate 16 and, on completion of copying, transports the document toward the 
guide 322. A document sensor SE6 is provided between the feed assembly 301 
and the conveyor belt 320, and another document sensor SE7 between the 
guide 322 and the reverse assembly 303. These sensors produce signals for 
controlling the transport of documents. The reverse assembly 303 for 
returning the document to the feed assembly 302 is used for reversing 
double-face documents and edition copying of such documents. 
To assure the user of convenience, the desired area of an original for 
edition copying is specified with face up, and the original is fed to the 
ADF in this state, so that the original set with its face up is first sent 
to the reverse assembly 302, where it is reversed and then positioned in 
place on the glass plate 16. 
As shown in FIG. 4, the ADF has on its upper surface a first operation 
panel 330, a second operation panel 360 and a display 380 for showing 
which side of the original should be up (down) when it is set. 
FIG. 5 shows an inter-image eraser 400 disposed downstream from the charger 
5 and opposed to the drum 1. The eraser 400 comprises an array of many 
light-emitting elements which can be selectively caused to emit light for 
erasing the electrostatic latent image on the drum 1 from the area other 
than the specified area. 
FIG. 6 shows operation keys as arranged on the operation panel of the 
copying machine. The operation panel 70 has a print key 71 for starting a 
copying operation, a numerical value display 72 capable of showing 
four-digit numerical values, ten keys 80 to 89 corresponding to the 
numerical values of 1, 2, . . . , 9 and 0, respectively, an interrupt key 
90 for specifying interrupt copying, a clear/stop key 91, a paper 
selection key 92 for specifying copy paper provided in stages according to 
the size, up and down keys 93, 94 for varying copy image density stepwise 
and specifying the desired density, and keys 95 to 103 for setting 
magnifications. 
The numerical value display 72 comprises seven-segment LED's 72a to 72d for 
four digit positions. The magnification is settable as desired over the 
range of 0.647.times. to 1.414.times. and is variable by 0.001 at a time. 
The magnification setting arrangement is described in detail in the 
aforementioned application Ser. No. 561,571. 
FIGS. 7, 8 and 9 show the first operation panel 330, the second operation 
panel 360 and the display 380 on the ADF. 
The first operation panel 330 shown in FIG. 7A is used for specifying areas 
for editing originals and copies. The panel has a graphic display 331 for 
showing the specified area, a number display 332 for showing an original 
area number, an up key 333 and a down key 334 for changing the original 
area number, a setting key 335 for setting the specified area number, and 
shift keys 336, 337 for specifying the copy area. 
The graphic display 331 comprises minute LCD's which are arranged in the 
form of a matrix and which are selectively turned on or off to give a 
graphic display. FIG. 7A shows an initial display for specifying an area 
of the original. Squares or a checkered pattern and area numbers 
corresponding to those on the area plate 311 are on display. When an area 
of the original is specified as will be described later, the specified 
area is shown as seen in FIG. 7B. On the other hand, when specifying a 
copy area, the display changes as shown in FIG. 7C. FIG. 7C shows frame 
lines 338 representing paper sizes and also shows where the fragmentary 
image 339 in the specified area of the original will be positioned on the 
paper if it is copied as it is. In the drawing, the horizontal direction 
corresponds to the direction of transport of paper (feed direction). The 
fragmentary image on display is shiftable horizontally (in the feed 
direction) by manipulating the shift keys 336, 337. FIG. 7D shows the 
fragmentary image as shifted leftward from the position in FIG. 7C by 
depressing the shift key 336. The amount of shift is stored in the manner 
to be described later to alter the paper transport timing and thereby 
shift the image to the specified position on copy paper. 
While the fragmentary image is shifted in the feed direction as stated 
above, the image is shiftable in the perpendicular direction using the 
manual feeder 40 shown in FIGS. 2 and 3, i.e., by shifting the manual 
feeder 40 in the perpendicular direction. The amount of shift is detected 
by the pulse disk 43 and the sensor 44 to shift paper size frame lines of 
the display 331 as seen in FIG. 7E. This enables the user to shift the the 
manual feeder 40 to the desired position with reference to the relation 
between the fragmentary image and the frame lines shown on the graphic 
display 331. 
In the case of manual feed, the display 331 shows the frame lines for all 
sizes of paper which is feedable when the table is in the shifted 
position. When a cassette is used for feeding paper, the size of paper to 
be used is known, so that the frame line for the selected paper size only 
is shown as seen in FIG. 7F. 
The second operation panel 360 shown in FIG. 8 has groups of keys and 
display or pilot lamps for selecting various modes and storing modes of 
edition copying afforded by combinations of different modes. With 
reference to the drawing, a key 361 at the left upper corner of the panel 
is an edition selection key. A lamp L1 at one side of the key and 
comprising an LED represents a document (original) edition mode when 
turned on. A lamp L2 represents a copy edition mode. One of these modes is 
selected by successively depressing the edition selection key 361. Both 
the lamps, when off, represent the usual copying mode. 
The keys and lamps in four horizontal rows and two vertical rows in the 
center of the panel 360 are used for selecting the combination of a 
particular kind of original and a particular kind of copy. The keys in the 
left vertical row are used for specifying the kind of original and 
include, as arranged downward, key 362 for one single-faced original, key 
363 for two single-faced original, key 364 for a double-faced original and 
key 365 for a book original. Lamps L3, L4, L5 and L6 above the keys 
are-turned on when the corresponding key is depressed. Similarly, the keys 
in the right vertical row are provided for specifying the kind of copy and 
include, as arranged downward, key 366 for one single-faced copy, key 367 
for two single-faced copy, key 368 for double-faced copy and key 369 for 
composite copy. Lamps L7 to L10 are provided for the keys. 
A mode selection key 370 is disposed at the left lower corner of the panel. 
When successively depressed, the key 370 selectively changes automatic 
paper selection mode represented by a lamp L11, automatic magnification 
selection mode by a lamp L12, manual mode by a lamp L13, edition paper 
selection mode by a lamp L14 and edition magnification selection mode by a 
lamp L15 one after another. 
A key 371 in the right upper portion of the panel 360 is a mode memory key. 
This key is used for storing in a memory up to two kinds of edition modes 
determined by the section of edition, selection of a particular 
combination of original and copy, and mode selection in combination. Two 
lamps L16 and L17 are provided beside the key 371 for representing the two 
kinds of edition modes. When the edition selection key 361 is depressed to 
select original edition, the upper lamp L16 for a first original (A 
original) goes on first. When the mode memory key 371 is depressed on 
completion of edition mode setting, the set mode is stored in the memory. 
Subsequently, the lamp L16 is turned off and the lamp L17 is turned on. 
The system is now in condition for accepting setting of edition mode for a 
second original (B original). 
FIG. 9 shows the display 380. In the edition mode, an indicator L18 goes on 
to show that the original is to be set face up. In the usual mode, an 
indicator L19 is on, showing that the original is to be set face down. 
This indicates that in the edition mode in which an area of the original 
is specified with the original positioned face up, the original can be fed 
as it is after the area specification. On the other hand, although the 
original is settable face up also in the usual copying mode, all the 
originals to be copied must then be reversed by the reverse assembly 303. 
This results in the drawback of necessitating a longer copying time and 
causing damage to the originals. The indicators L18 and L19 are provided 
to avoid the drawback. 
FIGS. 10, 11 and 12 show a control circuit useful for the copying machine 
of the invention. A first CPU 201 is connected via an interrupt terminal 
INT and data input and output terminals Sin, Sout to a second CPU 202 
(FIG. 10), third CPU 203 (FIG. 11) and fourth CPU (FIG. 12). 
The first CPU 201 feeds to an inter-image eraser controller 401 a signal 
for controlling the inter-image eraser 400. Indicated at 205 is a 
battery-backed-up RAM, at 206 a switch matrix and at 207 a decoder. Output 
terminals A1 to A7 are connected to drive switching transistors (not 
shown) for the main motor M1, developing motor M2, timing roller clutch 
CL1, upper paper feeder clutch CL2, lower paper feeder clutch CL3, charger 
5 and transfer charger 7, respectively. 
Various items of data for controlling a copying operation are written in 
the RAM 205 or stored therein as transferred from a ROM in the CPU. The 
RAM 205 has memories Q1 to Q8 for storing magnification data in 
corresponding relation to the magnification selection keys 95 to 98 and 
100 to 103. 
The second CPU 202 controls the optical system. Indicated at 208 is a drive 
circuit for the d.c. motor M3 for the scanning optical system, and at 209 
a drive circuit for a stepping motor M4 for driving the lens. The switches 
SW50 and SW51 are arranged in the path of scanning by the optical system 
and are actuated by the optical system. 
The third CPU 203 shown in FIG. 11 controls the ADF. The CPU is connected 
to switch matrices 390 for the first and second operation panels, group 
391 of LED lamps on the second operation panel, a graphic controller 392 
for controlling the graphic display 331, and an area number display 332. 
The third CPU 203 has input terminals B1, B2 for receiving input signals 
from the document sensors SE6,SE7, and output terminals B3 to B7 for 
delivering output signals to a document feed clutch CL301, a motor M5 for 
the ADF, a dicharge-reverse change-over clutch CL302 and the indicators 
L18, L19 of the display 380. 
The fourth CPU 204 shown in FIG. 12 controls the double face unit and has 
output terminals C1 to C5 for delivering control signals to the clutch 
CL100, clutch CL101, paper re-feed clutch CL103 and a motor M6 for the 
double face unit. Although not shown, the path of travel of paper in the 
double face unit has a plurality of sensors. The fourth CPU 204 produces 
the above control signals in accordance with paper detection signals from 
these sensors. 
The control modes according to the invention will be described with 
reference to the flow charts. FIGS. 13 to 19 are flow charts relating to 
the first CPU, FIGS. 20 and 21 are flow charts relating to the second CPU, 
FIGS. 22 to 29 are flow charts relating to the third CPU, and FIGS. 30 to 
31 are flow charts relating to the fourth CPU. 
FIG. 13 shows the main routine for the first CPU. In steps #1 and #2, 
initialization is done upon closing of initial switch. In step #3, a 
routine timer is set for defining the time taken for one routine. The next 
step #4 checks whether the machine is in copying operation. 
When the machine is found to be in a copying operation, step #8 follows. If 
otherwise, steps #5, #6 and #7 are performed for magnification setting 
subroutine a, magnification selection subroutine and a manual tray shift 
subroutine, respectively. 
Magnification setting is done using the keys 95 to 98 and 100 to 103 on the 
operation panel of the copying machine and key 104 within the machine, and 
the magnifications are stored in the memories Q1 to Q8 in the CPU 203. For 
the selection of magnification, one of the keys 95 to 98 and 100 to 103 is 
depressed, whereby the magnification stored in the corresponding memory 
area is retrieved. Lens position setting and scanning speed setting are 
done according to the magnification. These procedures are already made 
known by U.S. Pat. No. 4,575,227 and will not be described. 
Step #7 is the control subroutine to be executed in the copy edition mode 
for shifting a partial or fragmentary image in the perpendicular direction 
on copy paper. This step will be described with reference to FIG. 14. 
The subsequent step #8 is a subroutine for controlling the inter-image 
eraser for preparing a fragmentary image by document edition. This step 
will be described in detail with reference to FIGS. 15 and 16. 
Step #9 shows the control to be effected when the automatic magnification 
selection mode or automatic paper selection mode is selected for usual 
copying operation. This control is made known by application Ser. No. 
561,571 and therefore will not be described. 
Step #10 is the control subroutine to be executed when the edition paper 
selection mode or edition magnification selection mode is selected. This 
step will be described with reference to FIG. 17. 
Step #11 is a subroutine for shifting the fragmentary image on copy paper 
in the feed direction by controlling the timing rollers 26, as will be 
described in detail with reference to FIG. 18. 
Step #12 is a subroutine for controlling copying operation, as will be 
described in detail with reference to FIG. 19. 
Upon lapse of the time set on the routine timer in the final step #13, the 
sequence returns to step #3. Communications with the other CPU's are 
conducted by interrupt processes. 
Referring to FIG. 14 showing the manual feed tray shift subroutine, step 
#100 checkes whether the tray 40 has been shifted. If it is in the shifted 
position, the number of pulses indicating the amount of shift as detected 
by the pulse disk 43 and the sensor 44 is transmitted to the third CPU 203 
in step #101. The third CPU 203 in turn shifts frame lines on the graphic 
display. 
In the subroutine for controlling the inter-image eraser, steps #200 to 
#203 first detect on edge of the main motor M1, whereupon the entire 
eraser is turned on. At off edge, the entire eraser is turned off. 
Step #204 checks whether the current mode is usual copying or edition 
copying. In the former mode, steps #205 to #208 are executed, whereas in 
the edition copying mode, steps #209 to #215 are performed. The sequence 
then returns to the main routine. 
In the case of usual copying operation, the leading end of the latent image 
reaches the position of the inter-image eraser 400 in step #205. In step 
#206, the eraser elments over a length of eraser corresponding to the 
smaller of the paper width and the width of original multiplied by the 
magnification are turned off in step #206. When the rear end of the latent 
image reaches the position of the eraser in step #207, the eraser is 
entirely turned on in step #208. 
In the case of edition copying, the leading end of the latent image arrives 
in step #209, whereupon a timer T1 is set for giving a time delay 
corresponding to the distance from the image leading end to the first 
image block. More specifically, the distance is divided by the system 
speed (peripheral speed v of the drum) and further multiplied by the 
magnification to obtain a value, which is set on the timer T1 in step 
#210. In steps #211 to #213, upon completion of the operation of the timer 
T1, the eraser is turned off only over a length corresponding to the width 
of the image area multiplied by the magnification, and the distance 
corresponding to the length of the image area is calculated and set on a 
timer T2. For this calculation, the image area length is divided by the 
system speed and further multiplied by the magnification. On completion of 
the operation of the timer T2 in step #214, the eraser is entirely turned 
on in step #215. 
FIG. 16 schematically shows the partial or fragmentary image prepared by 
controlling the inter-image eraser as above. 
With reference to the subroutine shown in FIGS. 17A and 17B for automatic 
edition copy contol, steps #300 and #301 check whether the automatic 
edition magnification mode or automatic edition paper selection mode has 
been selected. Since the mode is set using the operation panel of the ADF. 
The setting is checked with reference to the mode signal from the third 
CPU 203. 
When the current mode selected is the edition magnification selection mode, 
a value obtained by dividing the length of the copy paper to be used by 
the length of area of the original is fed to an A register in step #302. 
In step #303, a value obtained by dividing the width of the paper by the 
width of area of the original is given to a B register. The length of 
original (document) area is the actual maximum length of the original area 
DE along the direction of scan as indicated at Ll in FIG. 48, whereas the 
width of the original area is not the actual width of the area. It is to 
be noted that the width is the distance from a reference edge (hereinafter 
referred to as "side reference edge") 395 on which one edge of the 
original is positioned when the original is placed on the document support 
glass plate, to the edge of the area DE which is remotest from the side 
reference edge 395 , as designated at Lw in FIG. 48. This is because the 
image of the area will not always be accommodated on the paper depending 
on the position of the area, if the actual width of the area is used for 
calculation. In step #304, the smaller of the values given to the A and B 
registers is entered in a C register. If the value on the C register is 
smaller than the minimum magnification (0.647X) set for the copying 
machine, the minimum value is set in the C register in steps #307 and 
#308. If the value in the C register is greater than the maximum 
magnification (1.414X), the maximum value is set in the C register in 
steps #307 and #308. In step #309, the value in the C register is set in a 
magnification register. 
When the current mode selected is automatic edition magnification 
selection, the above process automatically determines from the size of the 
specified area of the original and the paper size used a minimum 
magnification at which the fragmentary copy image can be entirely 
reproduced on the copy paper. 
On the other hand, when the automatic edition paper selection mode is 
selected, step #310 first calculates the size of the copy image to be 
obtained. FIG. 17B shows a subroutine for calculating the image size. In 
step #320, the area length Ll of the original (see FIG. 48) is multiplied 
by the specified magnification to use the calculated value as the vertical 
length of the copy image. In the next step #321, the width Lw of the area 
of the original (see FIG. 48) is multiplied by the magnification to use 
the calculated value as the horizontal length of the image. These lengths 
are set in a register in step #322. 
Referring to the flow chart of FIG. 17A again, the subsequent step #311 
checks whether the size of paper in the upper cassette 20 is larger than 
the image size calculated by the procedure of FIG. 17B. The size is of 
course checked as to the vertical and horizontal lengths to determine 
whether the paper in the upper cassette completely covers the copy image. 
When the check result is "YES", a similar check is made for the paper in 
the lower cassette 22 in step #312. If there is no suitable paper in the 
lower cassette, the upper cassette is selected (step #314). When the paper 
sizes of the two cassettes are found appropriate, the cassette of the 
smaller size is selected (step #315). 
If the interrogation of step #311 is answered by "NO", step #313 checks 
whether the paper size of the lower cassette is sufficiently large for the 
copy image. When the result is "YES" the lower cassette is selected 
(#316). If otherwise, the paper selection mode is changed to the manual 
mode because the current mode fails to permit complete copying. 
When the current mode selected is automatic edition paper selection, the 
above process automatically determines from the size of specified area of 
the original and the magnification a paper size which completely covers 
the fragmentary copy image. When the specified original area selected is 
away from a reference edge 396 (hereinafter referred to as "front 
reference edge") of the support glass plate at which the front edge of the 
original is to be positioned as seen in FIG. 48, processing for paper 
feeding which is different from the usual processing is required. This 
will be described below with reference to FIG. 18. 
FIG. 18 shows a subroutine for controlling the timing rollers. In this 
subroutine, the timing rollers are so controlled as to feed copy paper 
earlier or later than the usual feed timing and thereby shift the image 
area relative to the paper in the feed direction as already stated. 
Further the subroutine is so designed that in the automatic edition 
magnification selection mode or in the automatic edition paper selection 
mode, the feed timing is delayed in corresponding relation to the distance 
between the specified original area and the front reference edge to 
properly position the area relative to the paper. 
It is to be noted that before the subroutine is commenced, the timing 
rollers are already on according to the subroutine of FIG. 14 for copying 
operation. 
First, step #400 checks whether the leading end of paper has actuated the 
sensor SEl disposed before the timing rollers 26. If it is on, the next 
step #401 checks whether the copy area is shifted leftward on the first 
operation panel 330, i.e., in a direction opposite to the feed direction. 
When the check result is "YES" the amount of the shift is divided by the 
system speed, and a value (obtained by dividing the distance between the 
sensor SEl and the timing rollers by the system speed) is added to the 
quotient to obtain a value, which is set on a timer I (#402). When there 
is no leftward shift, the timing rollers are immediately turned off 
(#403). 
Subsequently, step #404 checks the timer I for the completion of its 
operation. On completion, the timing rollers are turned off in step #405. 
Thus, when the leftward shift is followed by these steps, the paper is 
stopped as forwarded beyond the timing rollers by a length corresponding 
to the amount of the shift. 
Next, step #406 detects a timing signal which is produced a given period of 
time after the switch SW50 is actuated by the scanning system, whereupon 
steps #407 and #408 check whether the current mode selected is the 
automatic edition magnification selection or automatic edition paper 
selection. When the current mode is found to be either one, a value is set 
on a timer II in step #409 which value is obtained by dividing the 
distance Li shown in FIG. 48, i.e., the distance between the forward end 
of the specified copy area DE and the front reference edge 396, by the 
system speed and multiplying the quotient by the magnification. 
When the current mode is neither of the two modes, step #410 checks whether 
the copy area is shifted rightward on the first operation panel 330. If 
the check result is "YES", the amount of the shift divided by the system 
speed is set on the timer II (#411). If the result is "NO" the timing 
rollers are immediately turned on (#412). Step #413 checks the timer II 
for the completion of its operation. On completion of the operation, step 
#414 turns on the timing rollers. Thus, when the copy area is in a 
rightward shifted position and when the area of the original specified in 
the automatic edition magnification or paper selection mode is away from 
the front reference edge, the feed timing for the timing rollers is later 
than the usual, whereby the copy image area is shifted toward the leading 
end of paper. Consequently the copy image can be entirely reproduced on 
the paper in the above-mentioned edition mode. 
In steps #415 to #418, the passage of the rear end of the paper over the 
sensor SEl is detected, whereupon thc distance of the timing rollers from 
the sensor SEl divided by the system speed is set on a timer III. The 
timing rollers are turned off on completion of operation of the timer III. 
FIG. 19 shows a subroutine for controlling the copying operation. First, 
steps #500 to #508 check whether the paper is fed manually or by the 
cassette and further whether the ADF is used to give a control signal with 
timing specific to a particular combination. 
Step #500 first checks whether the paper is fed manually, i.e., whether the 
manual feeder 40 is opened with reference to a signal from the sensor SE3. 
When the check result is "NO"(in the case of cassette feed), step #501 
checks whether the print switch is on edge. If yes, step #502 checks 
whether the ADF is to be used. When the ADF is not used, a copy start flag 
is set (#503), followed by step #509. When the ADF is used, an ADF start 
signal is delivered (#504), followed by step #509. 
On the other hand, when the inquiry of step #500 is answered with "YES", 
step #505 checks a sensor SE2 at the manual paper feed inlet as to whether 
it is on edge. If on edge, step #502 follows. If otherwise, step #506 
checks whether the ADF is to be used. When the ADF is used, step #507 
detects a document position signal indicating that the original is set in 
position on the glass plate 16. A copy start flag is then set (#508). 
Briefly, when copying is started (print switch on or insertion of paper 
into manual paper feed inlet), the ADF is started to set the original in 
place, whereupon the copy start flag is set. When the ADF is not used in 
this case, the flag is immediately set. 
The copy start flag in set position is detected in the next step #509, 
whereupon in step #510, the main motor, developing motor, sensitizing and 
transfer chargers and timing rollers are turned on, timers A and B are 
set, and the flag is reset. 
In steps #511 to #516, in accordance with which of the upper cassette, 
lower cassette and manual feeder is selected, a clutch for delivering 
drive force to the corresponding feed roller is turned on. 
The timers A and B set in step #510 are checked respectively in steps #517 
and #519 for the completion of operation, followed by turning off of the 
feed roller and start of scan (#518, #520). 
When the scanning system starts scanning and turns on the switch SW51, the 
second CPU 202 produces a timing signal a specified period of time after 
the switching (#521). The timing signal sets a timer C in step #522. On 
completion of operation of the timer C, the sensitizing charger is turned 
off, and the scan signal is changed to 0 (#523, #524). The timer C is set 
according to the paper size and magnification used. 
In the second CPU, when the home position signal changes to 1 with the 
return of the scanning system as will be described later (#525, #526), the 
developing motor and transfer charger are de-energized, the copy flag is 
reset and a timer D is set in step #527. 
Upon completion of operation of the timer D (step #528), the main motor is 
turned off in step #529. 
Although the operation of external devices has been described as being 
controlled step by step, the control signals, flags, etc. are merely set 
within the microcomputer in actuality, and such control signals are all 
fed out in step #530. 
FIG. 20 shows the main routine of the second CPU for controlling the 
scanning system and lens system. With reference to this drawing, the 
initialization of step #1000 is followed by step #1001 in which a routine 
timer is set, and by steps #1002 and #1003 for scanner control and lens 
control. On completion of the routine timer operation in step #1004, the 
sequence returns to step #1001. Communications with the first CPU are 
conducted by interruption. 
The subroutine of scanner control will be described later with reference to 
FIG. 21. The lens control subroutine, in which the lens is shifted to a 
position corresponding to the selected magnification, is executed in the 
same manner as in the prior art and will not be described. 
With reference to FIG. 21 showing the scanner control subroutine, step 
#1100 detects a scan signal on edge to start scanning in step #1101. The 
scan signal is set in step #521 of FIG. 19. 
In the next step #1102, whether a book mode is selected is checked. The 
book mode is disclosed, for example, in U.S. Pat. No. 4,017,173. In this 
mode, the front half page and the rear half page of a spread of a book as 
placed on the glass plate 16 are copied separately. The copying machine of 
this invention is set in this mode when book is selected as document on 
the second control panel. When one single-faced copy is selected, the 
specified front or rear half page is copied. When two single-faced copies 
is selected, the front half page and the rear half page is copied on 
separate sheets of paper. When double-faced copy is selected, the front 
half page and the rear half page are copied on the front and rear surfaces 
of a single sheet of paper. When an edition or composite instruction is 
given at the same time, the front half page and/or the rear half page will 
be copies as the specified original in accordance with the instruction. 
The size of the page may be entered by suitable means. Alternatively, an 
index movable in the scan direction may be provided at one side of the 
glass plate, such that the position of the index as set to the fold of the 
spread is detected. 
Referring again to the flow chart, on completion of scanning of the front 
and rear half pages, scan completion, return start and return signals are 
emitted in steps #1103 to #1105 and #1107. 
On the other hand, when the current mode is not the book mode, scan is done 
only over a range calculated from the paper size and the magnification 
(paper length divided by the magnification, or the full scan length if the 
value is greater than the full scan length) in step #1106 before step 
#1107. 
Steps #1108 to #1112 then follow, in which a timing signal is given a 
specified period of time, in accordance with the magnification, after the 
actuation of SW51 by the scanning system. In the case of the rear half 
page in the book mode, a timing signal is given a specified period of 
time, in accordance with the magnification, after the point of completion 
of the front half page has been passed (#1113 to #1115). 
When the switch SW50 for detecting the scanning system in the home position 
is on edge, return is completed, the return signal and timing signal are 
changed to "0", and the home position signal is changed to "1" in the 
following steps #1116 to #1118. The home position signal is "0" except on 
edge. 
FIGS. 22 to 28 are flow charts for the third CPU which controls the ADF. 
The main routine shown in FIG. 22 includes step #2000 for initialization, 
step #2001 for setting a routine timer, and steps #2002 to #2004 in which 
subroutines are executed for the first operation panel 330, the second 
operation panel 360 and display 380. Subsequently, step #2005 checks 
whether the operation is directed to edition copy. If the check result is 
"NO", the clutch CL302 is de-energized to deliver the original onto the 
discharge tray in step #2006, followed by step #2007 of document control 
subroutine. On the other hand, if the inquiry of step #2005 is answered 
with "YES",step #2008 follows for edition control subroutine. 
Finally, on completion of the routine timer operation in step #2009, the 
sequence returns to step #2001. Communications with the first CPU are 
conducted by interrupt processes. 
FIG. 23 shows the subroutine for controlling the first operation panel 330. 
First in steps #2100 to #2102, the display on the graphic display portion 
331 is changed in accordance with the selected mode, using the edition 
selection key 361 on the second control panel 360. When the current mode 
is found to be other than the copy edition mode with reference to the mode 
signal obtained by inter-CPU communication, original (document) edition 
image bearing surface is shown. In the case of the copy edition mode, the 
copy edition surface is shown in step #2102, whereupon the sequence 
proceeds to step #2128. 
Step #2103 checks which of the manual mode and cassette mode is selected 
according to whether the manual feeder 40 is open. 
In the case of the cassette mode, an effective copy image area is 
calculated from the paper size and the magnification in step #2104. The 
calculated effective area is not always in coincidence with an area of 
block units, so that a maximum area of block units within the effective 
image area is determined as the effective image area in step #2105 and the 
result is given to the graphic controller to display the area by hatching 
as shown in FIG. 24A. Alternatively, line indicators may be provided along 
two sides of the graphic display portion 331, the length of the lines 
being variable according to the size of the effective image area. 
In the cassette mode, the up key 333 and the down key 334 for specifying 
the document area are checked for on edge in steps #2106 and #2107. 
When the up key 333 is depressed, the block number is incrementally 
increased in step #2108. If the block number is outside the effective 
image area, step #2108 is repeated. If the block number exceeds a maximum 
(24 in the present embodiment), the block number is changed to "1" (#2109 
to #2111). 
When the down key 334 is depressed, the block number is decrementally 
decreased similarly in steps #2112 to #2115. 
When step #2103 founds that the selected mode is the manual feed mode in 
which the size of the paper to be fed is not known, the entire area is 
handled as being effective, the block number is incrementally or 
decrementally changed every time the up key 333 or down key 334 is on edge 
(#2116 to #2123). 
The block number thus set is shown on the block number display 332 in step 
#2124. When the setting key 335 is depressed for the block number on 
display (#2125), the block number is sent to the graphic controller 392 to 
display the set block area in black as seen in FIG. 24C. (The display 
color changes with the kind of the display elements used. The color 
display need not always be used insofar as the set area can be 
distinguished from the initial display and effective image area.) The 
block number is stored in the block memory (#2126, #2127). 
The following steps #2128 to #2132 and #2133 to #2137 are concerned with 
the shift of copy image area in the feed direction in the copy edition 
mode. The shift of copy area toward the feed direction on copy paper is 
herein called left shift, and the shift in a direction opposite to the 
feed direction is called right shift for the sake of convenience. This is 
because when an area is specified with the face of the original up, the 
left side of the original is positioned toward the feed direction 
according to the present invention. According to the present embodiment, 
left shift data, as well as right shift data, is set based on a reference 
case wherein the specified area on the original is copied on paper as it 
is without shifting. With reference to the flow chart, the left shift key 
336 on edge is detected in step #2128. If right shift data is already 
present, the data is reduced to "0" decrementally by depressing the left 
shift key 336, and left shift data is thereafter incrementally increased 
(#2129 to #2131). The set items of right shift data and left shift data 
are transferred to the graphic controller 392 and the first CPU 201 
(#2132). Based on the data, the graphic controller 392 shifts the copy 
area leftward on the copy edition mode display, while the first CPU 201 
controls the timing rollers as shown in the flow chart of FIG. 18 in 
accordance with the shift data. 
The same procedure as for the left shift key is followed for the right 
shift key 337 in steps #2133 to #2137. 
FIG. 25 shows the subroutine for the second operation panel 360. First, 
steps #2200 to #2205 effect on-off control of the lamp Ll representing the 
document edition mode and the lamp L2 representing the copy edition mode 
every time the edition selection key 361 is depressed. Both lamps, when 
off, represent the usual copying mode. Along with these displays, mode 
flags are used for various kinds of control. The lamp L16 for A original 
is turned on in step #2206, and both lamps L16, L17 for A and B originals 
are turned off in step #2207. 
When the system is found to be either document edition mode or copy edition 
mode in step #2208, document mode and copy mode inputs are accepted in 
step #2209. Step #2209 will be described as a subroutine of FIG. 25. 
Step #2210 detects the mode memory key 371 on edge. When the lamp L16 is 
on, indicating readiness for accepting mode setting for A original, the 
lamp L16 is turned off, the lamp L17 is turned on, and the mode so far set 
for A original with use of the first and second operation panels is stored 
in a first mode memory (#2211 to #2213). 
When the inquiry of step #2211 is answered with no, this indiates readiness 
for accepting mode setting for B original (lamp L17 on), so that the lamp 
L17 is turned off, and the mode for B original is then stored in a second 
memory (#2214, #2215). 
In the following steps #2216 to #2233, the mode selection key 370 is 
depressed for changing copying modes. One mode is changed over to another 
mode every time the key 370 is turned on. For example, when the mode 
selection key is depressed in the automatic paper selection mode (lamp Lll 
on), the lamp Lll is turned off, the lamp L12 indicating the next 
automatic magnification selection mode is turned on, and the corresponding 
flag is set. Similarly, the modes are changed one after another. The check 
of step #2224 as to the edition mode is done by detecting the document 
edition mode or copy edition mode selected by the edition selection key 
361. Finally, the mode selected is transferred to the first CPU 201 in 
step #2234. 
The step #2209 of FIG. 25 is shown as a subroutine in FIG. 26. In this 
routine, a combination of original and copy is selected by the keys 363 to 
369 in the center of the second operation panel. 
Steps #2235 to #2245 are steps for selecting a kind of original. When one 
of the keys 362 to 365 for specifying one single-faced original, two 
single-faced originals, double-faced original and book original is 
depressed, the corresponding one of the lamps L3 to L6 is turned on, with 
the others off. 
Similarly, steps #2247 #2258 are steps for selecting a kind of copy. When 
one of the keys 366 to 369 for one single-faced copy, two single-faced 
copies, double-faced copy and composite copy is depressed, the 
corresponding one of the lamps L7 to L10 is turned on, with the other 
lamps off. 
The original and copy modes selected are forwarded to the first CPU 201 in 
step #2259. 
FIG. 27 shows a subroutine for controlling the display 380 of FIG. 9. For 
the edition mode, the lamp L18 is turned on, indicating that the original 
is to be set face up, while the lamp L19 is turned off, indicating that 
the original should be set face down (#2300 to #2302). For the usual mode, 
the on-off relation is reversed (#2303, #2304). 
With the copying machine of the present invention, the original for 
document edition is placed on the feed tray of the ADF face up for the 
specification of area and is thereafter fed as it is, as already stated. 
The original is turned upside down by the reverse assembly and then 
positioned on the glass plate 16. In the usual mode, the original is set 
face down as in the prior art. To enable the user to set the original face 
up or down according to the mode selected without an error, the lamps L18 
and L19 indicate the state in which the original is to be set. 
FIG. 28 shows a subroutine for controlling the ADF in the usual copying 
mode. In steps #2400 to #2402, the ADF motor M5 and the document feed 
clutch CL301 are turned on condition that there is an original on the 
document tray (detected by an unillustrated sensor) and that the ADF start 
signal is "1" (step #504 in FIG. 19). Next, the document sensor SE6 
detects the rear end of the original (#2403), whereupon a period of time 
taken for the rear end to reach the exposure start position on the glass 
plate 16 is set on a timer E (#2404). When the completion of operation of 
the timer E is detected in step #2305, the motor M5 and the clutch CL301 
are turned off (#2406). Step #2407 changes the document home position 
signal to "1". The home position signal is detected in step #507 of FIG. 
19, whereupon a copying operation is started. 
In the usual copying operation, two or more originals will be copied, so 
that after the set number of originals have been copied (#2408), step 
#2409 checks whether there is any original on the document tray. If there 
remains an original, the ADF start signal is changed to "1", and the 
original is fed (#2410). In practice, the motor, etc. are turned on in 
step #2402 of the next cycle. If there is no original, the motor M5 is 
turned on to discharge the original on the glass plate 16 (#2411), and a 
timer F is set (#2412). The completion of operation of the timer F is 
detected in step #2413, whereon the motor M5 is turned off (#2414). 
FIGS. 29A to 29C show edition control subroutines for one single-faced 
original, two single-faced originals and double-faced original, 
respectively. 
In the case of one single-faced original shown in FIG. 29A, the document 
tray is checked for the presence of orginal thereon in step #2500. If the 
check result is "YES", the ADF motor M5 and the document feed clutch CL301 
are turned on (#2502) on condition that the ADF start signal is "1" 
(#2501). This signal is changed to "1" by step #504 of FIG. 19. 
Next, the clutch CL302 is turned on in step #2503 for the original to enter 
the reverse assembly 303. The feeder is allowed to stand in this state 
until the sensor SE7 detects the rear end of the original being 
transported in step #2504, whereupon an unillustrated clutch is changed 
over in step #2505 to reverse the direction of travel of ADF document 
conveyor belt. When the leading end of the original turned upside down by 
the reverse assembly 303 is detected by the sensor SE7 (#2506), a timer G 
is set in step #2507. On completion of operation of the timer G, the motor 
M5 is turned off (#2508, #2509). The timer G is set to the time taken for 
the leading end of the original to travel in the reverse direction to the 
exposure start position after actuating the sensor SE7. 
By the process described above, the original set in position face up is 
reversed, transported on the glass plate 16 and then stopped with its 
leading end located at the exposure start position. In step #2510, the 
document home position signal is changed to "1", indicating that the 
original is ready for copying. This signal is detected in step #507 of 
FIG. 19. Start of copying operation then follows. 
Step #2511 checks whether the copying operation for the set original has 
been completed. Next step #2512 checks whether there are other copying 
modes set for edition copying. Since the subroutine shown in FIG. 29A is 
intended for one single-faced original, the other copying modes as herein 
mentioned are for copying two areas of a single-faced original which are 
stored as A original and B original, including a case wherein the two 
areas are copied separately to obtain two single-faced copies, a case 
wherein the areas are copied to obtain a double-faced copy, and a case 
wherein the areas are copied as shifted to obtain a single-faced composite 
copy. If there is such a mode of edition copying, the sequence returns 
from step #2512 to step #2510, in which the document home position signal 
is changed to "1" again to start edition copying in this mode. 
When step #2512 detects that the entire copying operation has been 
completed, the direction of travel of the belt is changed again to the 
forward direction (#2513), the motor M5 is turned on (#2514), the clutch 
CL302 is turned off (#2515), the same timer F as mentioned with reference 
to FIG. 28 is set (#2516), and the motor M5 is turned off on completion of 
operation of the timer F (#2517, #2518). The main routine is then resumed. 
FIG. 29B shows the edition control subroutine for two single-faced 
originals. In this routine, step #2520 marked with "document feed" is 
identical with the process of steps #2500 to #2502 in FIG. 29A. Steps 
#2521, #2522 marked with "reversing", "document positioned?" are similarly 
identical with steps #2503 to #2509, whereby the original set face up is 
placed on the glass plate 16 face down. The document home position signal 
is changed to "1" in step #2523. When the copying operation for the 
original is completed (#2524), the original is discharged (#2525). The 
discharging step #2525 is identical with steps #2513 to #2518. 
Step #2526 checks whether the original has been fed twice. When only one 
original has been fed, step #2520 follows for the second original. 
FIG. 29C shows the edition control subroutine for double-faced original. In 
this routine, step #2530 reading "document feed" is identical with steps 
#2500 to #2502 of FIG. 29A. Steps #2531, #2532, and #2536, #2537 reading 
"reversing", "document positioned?" are identical with steps #2503 to 
#2509 in FIG. 29A. Step #2540 reading "discharging" is identical with 
steps #2513 to #2518 in FIG. 29A. 
In this subroutine, the first surface of the original set face up is first 
set on the glass plate 16 in steps #2530 to #2533. On completion of 
copying in step #2534, the belt is driven in the forward direction in step 
#2535. In steps #2536 to #2538, the second surface of the original is set 
on the glass plate 16. When the second surface has been copied (#2539), 
the original is discharged (#2540). 
FIG. 30 shows the main routine for the fourth CPU 204 for controlling the 
double face unit. The initialization step #3000 is followed by step #3001 
in which a routine timer is set, step #3002 in which a subroutine is 
executed for controlling the operation of the double face unit, and step 
#3003 in which the routine timer operation is completed. The sequence then 
returns to step #3001. As is the case with the other CPU's, the fourth CPU 
conducts communications with the first CPU 201 by interruption. 
FIG. 31 shows the operation control subroutine of step #3002. 
First, step #3100 checks whether the machine is in the double-faced copy 
mode. If the check result is "YES", step #3101 checks whether the paper is 
a front side copy or rear side copy depending on whether the paper is fed 
via the intermediate tray 253. In the case of a front side copy, the 
clutches CL100 and CL101 are turned on in steps #3102 and #3103, 
respectively, whereby the paper from the pair of discharge rollers 29 is 
led onto the intermediate tray 253. If a rear side copy is detected in 
step #3101, indicating that the edition copying is completed, the clutch 
CL100 is turned off to deliver the paper to the sorter 280. 
Step #3104 checks whether the machine is in the composite copy mode. In the 
case of the composite copy mode, the next step #3105 determines whether 
the copy is from the first copying cycle or the second. If it is from the 
first cycle, the clutch CL100 is turned on and the clutch CL101 is turned 
off in steps #3106 and #3107, with the result that the paper is 
transported without passing over the intermediate tray 253 and is 
subjected to the second copying cycle on the same side as the first. When 
the results of steps #3104 and #3105 are "YES", the sequence proceeds to 
step #3108. 
Subsequently, the intermediate tray is checked in step #3109 as to whether 
the paper has been completely thereby received. On completion, the clutch 
CL102 is turned on, moving the intermediate tray 253 to the broken-line 
position of FIG. 1 (#3110). A timer H is set in step #3111. On completion 
of operation of the timer H (#3112), the clutch CL102 is turned off 
(#3113), the clutch CL103 is turned on to deliver a drive power to the 
re-feed roller 254 (#3114), and a timer I is set (#3115). On completion of 
operation of the timer I, the clutch CL103 is turned off (#3116, #3117). 
According to the flow charts described, the copying machine of the present 
invention having the above features performs edition copying operation in 
various modes, which will be described below. 
FIG. 32 shows edition copies to be prepared from a single-faced original, 
which has A to L images as arranged downward. Of these, it is assumed that 
D and L are specified as copy image areas. With the original as well as 
the copy paper, the left edge shown is its leading end toward the feed 
direction. 
When a single-faced copy is to be made from the original, both D and L 
images are stored as A originals for specifying the copy image areas, and 
based on this area specification, the electrostatic latent images for the 
other A to C and E to K are erased by the inter-image eraser 400. The D 
and L images only are transferred onto copy paper. 
Next, when two single-faced copies (mode) is selected on the second 
operation panel 360, the two images on the single original are to be 
copied on two sheets of copy paper, so that D image and L image are 
separately area-specified. Thus, D image is stored as A original, and L 
image as B original. These images are reproduced on separate sheets of 
paper. 
To obtain two single-faced copies, the images are copied separately on two 
sheets of paper, whereas when double-faced copy is selected, the two 
images on the single original are copied on the front and rear sides of a 
single sheet of copy paper. Thus, the images on the single original are 
divided, so that this copy mode will be termed divided copy. In the case 
of double-faced copy, the areas of original are specified in the same 
manner as is the case with two single-faced copies, whereas a single sheet 
of copy paper is fed twice by the double face unit 250. In FIG. 32, L 
image stored as B original is shifted in the feed direction. Because the 
copying machine of the embodiment makes a perpendicular shift by shifting 
the manual feeder 40, it is to be noted that this shift is impossible for 
the rear side. When a perpendicular shift is to be made for both front and 
rear side by the present copying machine, the copying cycle for the 
combination of one single-faced original and one singlefaced copy is 
repeated again with use of the same sheet of copy paper. It is of course 
possible to conduct this operation automatically, for example, by 
rendering the intermediate tray movable in the perpendicular direction by 
a motor in accordance with an amount of shift given as an input. 
Finally a composite copy mode will be described. A composite copy is 
prepared from the single-faced original by separately specifying the two 
original image areas and copying these areas on a single sheet of copy 
paper, with the areas shifted relative to each other thereon. FIG. 32 
shows that D image stored as A original is shifted in a direction opposite 
to the feed direction and also upward, as illustrated,in the perpendicular 
direction. It is also seen that L image stored as B original is shifted 
toward the feed direction. 
Similarly, FIG. 33 shows various edition copy modes for two single-faced 
originals, FIG. 34 shows those for a double-faced original, and FIG. 35 
shows those for a book original. In these drawings, two original or copy 
paper portions shown as spaced apart by a large distance represent 
separate sheets, while such two portions shown as spaced apart by a small 
distance represent the front side (at left) and the rear side of one 
sheet. The hatched portions of the original are the selected copy image 
areas. The copying machine of the present invention is adapted for various 
modes of edition copying as shown in these drawings. Incidentally, it is 
to be noted that in FIGS. 33 to 35, there is no combination of the 
original with one single-faced copy. Further in the case of book 
originals, the ADF is used only for specifying copy image areas, and the 
book original is set manually by the user. 
Modifications of the present invention will be described next. 
According to the embodiment described, the effective copy image area and 
the specified copy image area are displayed in block units. The effective 
area is calculated from the paper size and the magnification. Depending on 
these parameters, the calculated area size is not always in agreement with 
block units, while according to the embodiment, an area made up of the 
largest number of blocks within the calculated area size is used as the 
effective area, in view of the resolving power which is dependent on the 
number of light-emitting elements constituting the inter-image eraser 400. 
When an increased number of light-emitting elements are used for giving an 
improved resolving power, it is possible to show an effective copy image 
area without being limted by block units as seen in FIG. 36 and to conduct 
edition accordingly. 
Display of effective copy image areas independent of block units is 
well-suited to electrophotographic copying machines in which the 
magnification is variable substantially steplessly, such as the one 
disclosed in U.S. patent application Ser. No. 498,885 filed on May 27, 
1983. 
When the effective copy image area is to be displayed as shown in FIG. 36, 
the blocks which are covered by the effective area only partly need also 
be specified. With reference to FIG. 37, for example, the blocks 12 and 16 
need to be specified. Whereas in step #2105 of FIG. 23, the effective copy 
image area calculated in step #2104 is expressed in blocks, such a display 
can be realized by feeding the calaculated effective area to the graphic 
controller as it is, in place of the above step. The unit of calculation 
is of course dependent on the resolving power of the inter-image eraser 
400. For the display of the specified area of FIG. 37, the judgment of 
steps #2109 and #2113 in FIG. 23 is so made as to also include the block 
numbers which lap over the effective area only partially. As to the 
overlapping block numbers included in the block numbers sent to the 
graphic controller in step #2126, the controller is so adapted as to show 
only the portions which overlap the effective area. 
According to a second modification, the graphic display mounted on the 
first operation panel 330 is provided on the operation panel 70 of the 
copying machine. As seen in FIG. 38A, the seven-segment display of the 
operation panel 70 is afforded by a graphic display 500 which serves as a 
seven-segment display portion for showing the number of copies, 
magnification, etc. and which also shows document edition blocks and gives 
copy edition displays such as those shown in FIGS. 7C to 7F. In this case, 
the control circuit of the first CPU 201 includes a graphic controller 501 
for controlling the graphic display 500. Of course, edition copy display 
data is delivered from the third CPU 203. 
A third modification relates to the specification of block numbers by the 
first operation panel. FIG. 40 shows a first operation panel 600. 
According to the foregoing embodiment, the block number is incrementally 
or decrementally changed, whereas this modification has four keys 601, 
602, 603 and 604 for shifting the block upward, downward, leftward and 
rightward. Using these keys, the block number shown on the number display 
332 is changed and the number is specified as a portion of the specified 
area. To realize this, steps #2106 to #2123 of FIG. 23 are replaced by the 
sequence shown in FIG. 41. 
With reference to the flow chart of FIG. 41, steps #2150 to #2153 are for 
the up shift key 601, steps #2154 to #2160 are for the right shift key 
602, steps #2161 to #2167 are for the down shift key 603, and steps #2168 
to #2171 are for the left shift key 604. 
Upon depression of the up shift key 601, "1" is first subtracted from the 
data in a block number setting register D (#2150, #2151). The register D 
is first set to "1" by the initialization of the main routine of the third 
CPU. Steps #2152 and #2153 detect that the data in the register become 0, 
4, 8, 12, 16, 20, whereupon "1" is added to the register to resume the 
initial block numbers because the block numbers before step #2151 were 1, 
5, 9, 13, 17, 21, indicating the upper limit of the shift. 
Next, when the right shift key 602 on edge is detected, "4" is added to a 
register D in step #2155. Steps #2156 and #2157 prevent the block numbers 
from shifting rightward beyond the right edge of the display. 
Step #2158 determines whether the current mode is the manual feed mode or 
cassette mode. In the case of the manual feed mode in which the paper size 
is not known, no effective copy image area is set. The sequence therefore 
proceeds to steps #2162 et seq. for the down shift key. In the case of the 
cassette mode, the block numbers are prevented from shifting out of the 
effective copy image area by steps #2159 to #2160. Thus, "4" is subtracted 
from the data in the register D (shifting the blocks leftward) to render 
the right shift key 602 operable only within the effective copy image 
area. 
With the copying machine of the present invention, the sheets of paper to 
be fed are in register at one side, so that the effective copy image area 
is unchanged at its upper edge and left edge and changes only at the lower 
edge and right edge as seen in FIG. 24A. Accordingly, the blocks will not 
be shifted out of the effective area by the up shift key and the left 
shift key. It therefore follows that the judgment as to the manual feed 
mode, judgment as to whether the blocks are within the effective area and 
the steps concerned are provided only for the right shift key and the down 
shift key. 
Steps #2161 to #2167 for the down shift key include steps #2162 to #2164 
which are in reverse relation to those for the up shift key. Steps #2165 
to #2167 are provided for limiting the foregoing shiftable range to within 
the effective copy image area. 
Steps #2168 to #2171 for the left shift key are in reverse relation to 
steps #2154 to #2157 for the right shift key. 
Of the keys included in the switch matrix of FIG. 11, the keys 333 and 334 
are of course replaced by the keys 601, 602, 603, 604 for the above 
modification. 
A fourth modification is adpated to specify copy image blocks using ten 
numerical keys. FIG. 42 shows a first operation panel 600' provided with 
such a ten-key arrangement. Input control in this case may be done in the 
same manner as when the usual copy number setting ten-key arrangement is 
manipulated and therefore will not be described. Since the panel shown in 
FIG. 42 has no clearing key, the display is so adapted that the input 
numerical value is shown in the units position, with the preceding value 
in the units position shifted to the tens position. The area specified in 
the case of cassette mode can be limited to within the effective copy 
image area by such a procedure that if the block number on display when 
the setting key is depressed is outside the effective area, the number is 
not accepted, with no black display on the block display portion 331. The 
display of "00" may be given or the number display portion may be made to 
flicker to notify the user of such a situation. 
The numerical ten-key arrangement on the operation panel of the copying 
machine may be used for specifying block numbers. In this case, the first 
operation panel is the one shown in FIG. 42 from which the ten-key 
arrangement is omitted. Further in this case, the input by the ten-key 
arrangement on the copying machine is transferred to the third CPU only 
while the document edition mode is selected by the edition selection key 
to use the input for the display of block number, while the displays of 
copy number, etc. are allowed to remain unchanged. 
When the ten-key arrangement on the operation panel of the copying machine 
is used, a graphic display 500 may be provided on the copying machine 
operation panel as seen in FIG. 38B. This assures greater convenience. 
FIG. 43 shows such a modification, in which the number display 332, 
setting key 335, left and right shift keys 336, 337 on the first panel are 
also mounted on the operation panel of the copying machine. 
FIG. 44 shows a sixth modification of first operation panel 600". The 
blocks comprise self-illuminating switches SL1 to SL24. The 
self-illuminating switch has a pressing surface which, when pressed on, 
emits light. According to the embodiments described, the setting key 335 
is depressed for each block for specifying an edition area, whereas with 
the panel shown in FIG. 44, an area can be specified by depressing the 
setting key 335 after all the self-illuminating switches in the specified 
area are turned on. Because self-illuminating switches are unable to 
provide two kinds of displays, the line indicators shown in FIG. 24B may 
be used for showing the effective copy image area. The line indicator can 
be an array of minute LED's. 
FIG. 45 shows part of a control flow chart for the self-illuminating 
switches SL1 to SL24, which substitutes for steps #2106 to #2124 of FIG. 
23. 
Although FIG. 45 shows a sequence for the switch SL1 only, the other 
switches which are not shown are controlled by exactly the same sequence. 
Step #2180 detects the switch on edge. If the check result is "NO", a 
similar check follows for the next switch. If the result is "YES", step 
#2181 checks whether the switch is on. When on, the switch is turned off 
(#2182), whereas if off, the switch is turned on (#2183). When step #2125 
in FIG. 23 detects the depression of the setting key 335, the block number 
of the switch turned on is stored in the memory in the next step #2127. In 
the case of the self-illuminating switch, step #2126 in FIG. 23 is 
omitted. FIG. 45 does not show the step for limiting the specified area to 
within the effective copy image area. This can be realized by the 
additional steps of checking whether the self-illuminating switch turned 
on, i.e., the block number thereof, is within the effective area and 
holding the switch off if the result is negative. 
Another modification relates to perpendicular shift for copy edition. The 
embodiment already described employs the method of shifting the manual 
feeder in the perpendicular direction, detecting the amount of the shift 
by the pulse disk 43 and the photosensor 44 and shifting frame lines 
representing copy paper on the copy edition display on the graphic display 
portion 331 to show the position of the specified area relative to the 
paper. This method readily indicates the position of the paper and the 
specified area relative to each other, but the manual feeder is positioned 
usually away from the graphic display portion, so that the arrangement is 
difficult to use. 
FIG. 46 shows an indicator disposed in the vicinity of the manual feeder 
for indicating the width in the perpendicular direction of the specified 
area. More specifically, an LED array 700 is provided on the main body 
close to the manual feeder, and the array 700 indicates the width of the 
specified area. Since the LED array is mounted on the copying machine main 
body, it is controlled for flickering by the first CPU 201 as seen in FIG. 
39. For this control, the subroutine shown in FIG. 47 is added to the main 
routine for the first CPU. In step #4000 in FIG. 47, a value obtained by 
multiplying the width of the specified copy image area by the 
magnification is set in the register E, and the value is given as L data 
for turning on the LED array 700 (#4001). 
Although the present invention has been fully described by way of examples 
with reference to the accompanying drawings, it is to be noted 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 being 
included therein.