JPH02308179A - Image forming device - Google Patents

Abstract

PURPOSE:To form an image in such a manner that a front page faces upward by forming an image on a specific paper in a one-sided mode when an image is formed only on one side of the specific sheet for a front page in a double- sided mode. CONSTITUTION:An image forming means 300 operates in the one-sided mode where an image is formed on one side of the sheet and the sheet is ejected, and in the double-sided mode where images are formed on both sides of the sheet and the sheet is ejected. A feed means 200 feeds the specific sheet for a front page whenever an image is formed in a prescribed manner. A control means 800 controls the image forming means 200 so as to form an image only one side of the specific sheet when an image is formed only on one side of the specific sheet in the double-sided mode. Consequently, an image is formed so that a front cover faces upward.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an image forming apparatus that feeds a specific sheet every time a predetermined image is formed.

[Background of the invention]

2. Description of the Related Art Conventionally, image forming apparatuses such as copying machines are known that have a cover mode in which a specific sheet is inserted or a copy is made on a specific sheet for each number of original sheets or for each unit number of sheets. In this cover mode, it is possible, for example, to copy a document corresponding to a cover using sheets of different colors, or to insert an extra sheet of paper of a different color as a partition sheet.

[Problem that the invention is trying to solve] However,
If you select double-sided copy mode, which creates double-sided copies from a single-sided original, while in cover mode, which copies from a specific sheet, the number of original sheets is not known in advance, so if you create double-sided copies from the final original, the number of original sheets will increase. If the number of copies is odd, the front cover will become a copy of the back side.

The present invention has been made in view of the above points, and an object of the present invention is to provide an image forming apparatus that can form an image so that the cover always becomes the front surface when forming a screen image.

[Means for solving problems]

To this end, the present invention provides an image forming means that can operate in a single-sided mode in which an image is formed on one side of a sheet and then ejected, and a double-sided mode in which an image is formed on both sides of the sheet and then ejected, and a a feeding means for feeding a sheet, and control for controlling the image forming means to perform image formation on the specific sheet in the single-sided mode when the image formation on the specific sheet is only on one side in the double-sided mode; It is something that has the means.

This makes it possible to perform seed image formation on a specific sheet in which the cover is always the front surface.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing the internal configuration of an embodiment of a copying apparatus to which the present invention can be applied. In this figure, 100 is the main body of the copying machine, 200 is a pedestal having a double-sided processing function for turning over the recording medium (paper) during double-sided recording, and a multi-recording function for recording multiple times on the same recording medium, and 300 is a pedestal.
is a circulation type document feeder (hereinafter referred to as R) that automatically feeds documents.
400 is a sorting device (hereinafter referred to as a sorter) that stores recorded paper into a plurality of bins, and each of these devices 200 to 500 can be used in combination with the main body 100 as desired. can.

A1 main body (100) In the main body 100, 101 is a document table glass on which a document is placed, 103 is an illumination lamp (exposure lamp) that illuminates the document, and 105, 107, and 109 are scanning devices that change the optical path of light reflected from the document. reflective mirror (scanning mirror), 11
Reference numeral 1 indicates a lens having focusing and variable magnification functions, and reference numeral 113 indicates a fourth reflection mirror (scanning mirror) that changes the optical path. 1
15 is an optical system motor that drives the optical system, 117.119
, 121 are sensors, respectively.

131 is a photosensitive drum, 133 is a main motor that drives the photosensitive drum 131, 135 is a high voltage unit, 137 is a blank exposure unit, 139 is a developer, 140 is a developing roller, 141 is a transfer charger, 143 is a separation charger, and 145 is a cleaning device.

151 is the upper cassette, 153 is the lower cassette, 171
1 is a manual paper feed slot, 155 and 157 are paper feed rollers, 1
59 is a registration roller. Further, 161 is a conveyor belt that conveys the image-recorded sheet to the fixing side, 163 is a fixing device that fixes the conveyed sheet by thermocompression bonding, and 1
67 is a sensor used for double-sided recording.

The surface of the photosensitive drum 131 described above is made of a seamless photoconductor using a photoconductor and an electric conductor. The motor 133 starts rotating in the direction of the arrow in the figure. Next, when the predetermined rotational control and potential control processing (preprocessing) of the drum 131 is completed, the original placed on the original platen glass 101 is illuminated by the illumination lamp 103 configured integrally with the first scanning mirror 105. , the reflected light from the original is transmitted to the first scanning mirror 105, the second scanning mirror 107, the third scanning mirror 109, and the lens 1.
111 and the drum 131 via the fourth scanning mirror 113
image on top.

The drum 131 is corona charged by a high pressure unit 135. After that, the image illuminated by the illumination lamp 103 (
The original image) is exposed to slit light, and an electrostatic latent image is formed on the drum 131 using the known Carlson method.

Next, the electrostatic latent image on the photosensitive drum 131 is transferred to a developing device 139.
The toner image is developed by a developing roller 140 and visualized as a toner image, and the toner image is transferred onto a sheet by a transfer charger 141 as described later.

That is, the upper cassette 151 or the lower cassette 1
53 or a sheet placed in a cassette in the manual paper feed slot 171 is fed into the main unit by a paper feed roller 155 or 157, and is sent toward the photosensitive drum 131 with accurate timing by a registration roller 159, where the latent image is The leading edge and the leading edge of the transfer paper are matched. Thereafter, the sheet passes between the transfer charger 141 and the drum 131, so that the toner image on the drum 131 is transferred onto the sheet.

After this transfer is completed, the sheet is separated from the drum 131 by a separation charger 143, guided to a fixing device 163 by a conveyor belt 161, fixed by pressure and heat, and then discharged from the main body 100 by a discharge roller 165. Ru.

After the transfer, the drum 131 continues to rotate, and its surface is cleaned by a cleaning device 145 composed of a cleaning roller and an elastic blade.

B. Pedestal (200) The pedestal 200 is a deck 201 that can be separated from the main body 100 and can store 2,000 sheets.
and an intermediate tray 203 for double-sided copying.

Further, the lifter 205 of the deck 201, which can accommodate 2,000 sheets, rises according to the amount of sheets so that the sheets always come into contact with the paper feed roller 207.

Reference numeral 211 denotes a paper ejection flapper for switching the path between the double-sided recording side or multiplex recording side and the ejection side path; 213.
215 is a conveyance path of a conveyance belt, 217 is an intermediate tray dust for holding down the sheet, and the sheet that has passed through the paper ejection flapper 211 and the conveyance paths 213 and 215 is turned over and stored in the intermediate tray 203 for double-sided copying. . A multiple flapper 219 switches between double-sided recording and multiplex recording, and is disposed between the conveyance paths 213 and 215, and guides the sheet to the multiplex recording conveyance path 221 by rotating upward.

Reference numeral 223 is a multiple sheet discharge sensor that detects the end of the sheet passing through the multiple flapper 219. A paper feed roller 225 feeds the transfer paper to the drum 131 through a path 227. 229 is a discharge roller that discharges the sheet to the outside of the machine.

During double-sided recording (double-sided copying) or multiplex recording (multiple overlapping copying), first raise the paper ejection flapper 211 of the main body 100 upwards and move the copied sheet to the conveyance path 213 of the pedicle 200.
, 215, and stored in the intermediate tray 203. At this time, the multiplex flapper 219 is lowered during double-sided recording.
During multiple recording, the multiple flapper 219 is raised (this intermediate tray 203 can store up to 99 sheets, for example. The sheets stored in the intermediate tray 203 are held down by the intermediate tray weight 217.

During the next back-side recording or multiplex recording, the sheets stored in the intermediate tray 203 are moved one by one from the bottom to the path 225 and the weight 217.
27 to the registration rollers 159 of the main body 100.

C, RDF (circulating document feeder) (300) RDF
In 300, reference numeral 301 is a stacking tray on which a stack of originals 302 is set. First, when a single-sided original is used, a half-moon roller 304 and a separating roller 303 separate the originals one by one from the bottom of the stack. After being conveyed to the exposure position on the platen glass 101 via passes (1) to (2), the sheet is stopped, and the copying operation is started. After the copying is completed, the transport large roller 307
The document is then sent to path V, and then returned to the upper surface of the document bundle 302 by the discharge roller 308. Reference numeral 309 denotes a recycle lever that detects one cycle of the original, and is placed on the top of the stack of originals at the start of original feeding, and when the originals are sequentially fed and the trailing edge of the final original passes through the recycle lever 309.
One cycle of the original was detected as it fell under its own weight.

Next, for double-sided originals, pass the original through -H passes 1 and II as described above.
Then, by switching the rotatable switching flapper 310, the leading edge of the document is guided to the path ■, and the transport roller 3
05, it passes through path (2) and is conveyed onto the platen glass 101 by the full-surface belt 306, and then stopped. In other words, the large conveyance roller 307 is configured to reverse the document along the routes of passes (1) to (2) to (2).

The number of originals can also be counted by conveying the original bundle 302 one by one through the paths ≈≈≈≈≈≈≈≈∆∆∆∆ until one cycle is detected by the recycle lever 309.

D. Sorter (sorting device) (400) Sorter (400
) has a 25-bin tray and sorts recorded sheets. The copied sheets are sequentially ejected from the paper ejection roller 229 of the main body, enter the conveyance roller 401 of the sorter, and are ejected to each bin 411 from the ejection roller 405 via a path 403. For example, in sort mode, a bin shift motor (not shown) is activated each time a sheet is ejected into each bin.
The bins are raised and collated.

FIG. 2 shows an example of the arrangement of the operation panel provided on the main body 100 described above. The operation panel has a key group 600 and a display group 700 as described below.

F. Group of keys (600) In Fig. 2, 601 is an asterisk (*) key, which is used by the operator (user) when in the setting mode, such as setting binding substitution or setting the size of original frame eraser. .

606 is an all reset key, which is pressed to return to the standard mode. Reference numeral 602 is a preheating key, which is pressed to put the machine of the main body 100 into a preheating state and to cancel the preheating state. This key 602 is also pressed when returning from the auto-shutoff state to the standard mode.

605 is a copy start key (copy start key);
Press to start copying.

A clear/stop key 604 functions as a clear key during standby and as a stop key during copy recording. This clear key is pressed to cancel the set number of copies. It is also used to cancel * (asterisk) mode.

Also, press the stop key to interrupt continuous copying. The copying operation stops after the copying at the time when the button is pressed is completed.

Numeric keys 603 are pressed to set the number of copies. It is also used to set the * (asterisk) mode. A memory key 619 allows the user to register frequently used modes. Here M1-M
You can register in 4 ways.

Copy density keys 611 and 612 are pressed when manually adjusting the copy density. 613 is the AE key,
Press this button to automatically adjust the copy density according to the density of the original, or to cancel AE (automatic density adjustment) and switch the density adjustment to manual. A cassette selection key 607 is pressed to select the upper cassette 1511, the middle cassette 153, and the lower paper deck 201. Further, when a document is placed on the RDF 300, APS (automatic paper cassette selection) can be selected using this key 607.

When APS is selected, a cassette of the same size as the original is automatically selected.

Reference numeral 610 is a same size key, which is pressed to make a same size (original size) copy. Reference numeral 616 is an auto-magnification key, which is pressed to automatically reduce or enlarge the original image according to the specified transfer paper size. 617 and 618 are zoom keys, which are pressed to specify any magnification between 64% and 142%. 608 and 609 are fixed size scaling keys, which are pressed when specifying reduction or enlargement of the fixed size.

A double-sided key 626 is pressed to make a double-sided copy from a single-sided original, a double-sided copy from a double-sided original, or a single-sided copy from a double-sided original. 625 is a binding margin key, which can create a binding margin of a specified length on the left side of the sheet. 62
4 is a photo key, which is pressed when copying a photo original.

Reference numeral 623 is a multiple key, which is pressed when creating (combining) images from two originals on the same side of a sheet.

Reference numeral 620 denotes a document frame erase key, which the user presses when erasing the frame of a standard size document.The size of the document at that time is set using the asterisk key 601.

Reference numeral 621 is a sheet frame erase key, which is pressed to erase the frame of the document according to the cassette size.

622 is a page continuous copying key, which allows you to copy the left and right pages of a manuscript.
Press to copy each sheet separately.

Reference numeral 614 is a paper ejection method (stable, sort, group) selection key. If a stabler that can bind recorded sheets in a stable manner is connected, the stable mode and sort mode can be selected or canceled, and the sorting mode can be selected. If a tray (sorter) is connected, you can select or cancel sort mode and group mode.

Reference numeral 615 is a paper folding selection key that allows selection and cancellation of Z-folding, which folds a recorded sheet of A3 or B4 size into a Z-shaped cross section, or half-fold, which folds a recorded sheet of A3 or B4 size in half.

G. Display group (700) In FIG. 2, 701 is an LCD (liquid crystal) type message display that displays information regarding copying.
The text message and the copying magnification set using the standard magnification keys 608 and 609, the same magnification key 610, and the zoom keys 617 and 618 can be displayed. This display 701 is a transflective liquid crystal display and uses two colors for the backlight.Normally, a green backlight is lit, and an orange backlight is lit when an abnormality occurs or when copying is not possible.

Reference numeral 706 denotes an equal magnification display, which lights up when equal magnification is selected. Reference numeral 703 is a color developer indicator, which lights up when a sepia developer is set. A copy number display 702 displays the number of copies or a self-diagnosis code. 7
05 is the used cassette indicator, and the upper cassette 151
, middle cassette 153, or lower deck 201 is displayed.

704 is an AE display, and the AE key 613
Lights up when (automatic density adjustment) is selected.

Reference numeral 709 is a preheating indicator, which lights up in the preheating state. When in the auto shut-off state, this indicator 70
9 blinks. 707 is a ready/wait indicator, which is a two-color LED of green and orange; green lights up when ready (copy possible), and lights up when wait (copy possible).
(When copying is not possible), the color lights up orange.

A double-sided copy indicator 708 lights up when either double-sided copying from a double-sided original or double-sided copying from a single-sided original is selected.

When using the RDF300 in standard mode, the settings are 1 copy, density AE mode, automatic paper selection, same size, and 1-sided copying from a 1-sided original. RDF300
When not in use, the standard mode is set to 1 copy, manual density mode, same size, and 1-sided copying from a 1-sided original. The difference between using and not using RDF300 is RDF
It depends on whether an original is set in 300 or not.

Further, 710 is a power lamp, which lights up when the power switch is turned on.

Next, the asterisk mode will be explained with reference to Table 1.

First, each time the asterisk key 601 is pressed, asterisk mode menu messages are sequentially displayed on the message display 701. 1 for asterisk mode
There are 0 types, memorizing the copy mode, setting the binding margin width, setting the original frame erase size, automatically setting the magnification ratio, mixing originals, setting the auto clear, cleaning the charger, setting the date and time, cover mode settings and document auto count mode.

To memorize the copy mode, first press the asterisk key 6.
Before pressing 01, set the copy mode in which you want to store the number of copies, density, etc. Then the asterisk key 6
01, then the memory key 619, and the asterisk key 601 again to store the preset copy mode.

This copy mode can be called up by pressing the memory key 619.

To set the binding width, first press the asterisk key 601.
Press , enter the number specified in the binding margin width setting section of the menu message using the numeric keypad 604, and then press the asterisk key 601 to enter the binding margin width setting mode. When the user inputs the desired binding margin width number using the numeric keypad 604 according to the message and presses the asterisk key 601, the binding margin width is set. When creating a binding margin, it will use the width set here.

To set the document frame erase size, first enter the document frame erase setting mode using the asterisk key 601 and numeric keypad 604 in the same way as for setting the binding margin width. Then, using the designated zoom keys 617 and 618, the desired size is displayed on the message display 701. If the asterisk key 601 is pressed when the desired size is displayed, that size is registered.

To automatically set the magnification ratio, first use the asterisk key 601 and numeric keypad 604 in the same way as setting the binding margin width.
Enters automatic magnification setting mode.

According to the instructions in the message, input the original size and desired size using the asterisk key 601 and the numeric keypad 604. The magnification/reduction ratio is calculated from the two values and set.

When you want to mix document sizes of different sizes, first press the asterisk key 601 and the numeric keypad 60 in the same way as setting the binding margin width.
4 enters the mixed original setting mode. Therefore, the operator inputs and sets whether to mix the originals or to prohibit mixing the originals using the designated key.

To set the time until the automatic return to standard mode (auto clear) after copying or key operations are completed, or to stop the auto clear function, first set the binding margin width. Asterisk key 6 as well as settings
01 and the numeric keypad 604 to enter the auto clear setting mode.

Specify the desired time using the numeric keypad, or enter the number at which the function will be stopped, and press the asterisk key 601 to set it.

To clean the charger, in the same way as setting the binding width,
The charger cleaning mode is entered by pressing the asterisk key 601 and the numeric keypad 604. When you press the key specified here,
Start cleaning the charger.

To set the date and time, use the asterisk key 601 and the numeric keypad 604 to enter the date and time setting mode, similar to the setting of the binding margin width. Here, enter the date and time using the specified input method using the numeric keypad 604 and the asterisk key 601, and finally enter the date and time using the asterisk key 601.
Press 01 to set the entered date and time.

To set the cover mode, first enter the cover mode setting mode by using the asterisk key 601 and numeric keypad 604 in the same way as for setting the binding margin width.

Using a designated key, a mode for copying onto the cover and a mode for attaching a cover without copying to the cover are selected, and by pressing the asterisk key 601, the mode is set. The set cover mode is cleared by pressing the reset key 606, using the auto clear function, or turning off the power.

To set the document auto count mode, first press the asterisk key 601 and the numeric keypad 6 in the same way as setting the binding margin width.
04 enters the document auto count mode setting mode. The document auto-count mode is a mode in which the number of documents set in the RDF is automatically counted.

Here, set whether to auto count or not by inputting the specified key.

H8 Control Device (SOO) FIG. 3 shows an example of the circuit configuration of the control device 800 of the embodiment shown in FIG. In FIG. 4, 801 is a central processing unit (CPU) that performs arithmetic control for executing the present invention, and uses, for example, a microcomputer V50 manufactured by NEC (NEC Corporation). 803 is a read-only memory (ROM) in which a control procedure (control program) as shown in FIG. 5 according to the present invention is stored in advance;
1 controls each component device connected via the bus according to the control procedure stored in this ROM. Reference numeral 805 denotes a random access memory (RAM) which is a main storage device used for storing input data and as a working storage area.

807 is an interface (Ilo) that outputs the CPU 801 control signal to a load such as the main motor 133; 809
inputs input signals from the image tip sensor 121, etc., and outputs the CPU 80.
1, an interface 811 is an interface for controlling input/output between the key group 600 and the display group 700. These interfaces 807.809.
811 is NEC's input/output circuit board μPD825, for example.
Use 5.

Note that the display group 700 is each display device shown in FIG. 3, and uses LEDs and LCDs. The key group 600 is each key shown in FIG. 3, and the CPU 801 can determine which key has been pressed using a known key matrix.

Next, the operation in advance paper feeding mode will be explained.

This operation is performed for the purpose of increasing the efficiency of copying when a document is set on the RDF 300 and one copy is made for each document.

This will be explained based on the flowchart shown in FIG.

(6-1) After the copy key is pressed, the first document is drawn from the RDF onto the document glass 101.

(6-2) Once the original has stopped on the original glass 101,
(6-3) Cassette 151 containing sheets suitable for the original size. 153. One of the decks 201 is selected and paper is fed. For example, if an A4 document is used and there is an A4 size sheet in the paper deck 201 at the same size, the deck is selected. A sheet of the size determined at this time is used for this series of copies.

(6-4) When the sheet reaches the first rugist roller 159, (6-5) Copying is performed using a generally known process, and (6-6) the cycle lever 309 is used to determine whether the current document is the last one from the RDF. be informed.

(6-7) If there is the next original, immediately feed the sheet from the paper deck.

(6-8) Replace the original at the same time as 6-7, and (6-8)
-9) Bring the next original onto the original glass 101. Then, the process returns to 6-4 again to start the next operation.

(6-10) When the final manuscript is finished, eject the manuscript,
(6-11) When the discharge is completed, the process ends.

As explained above, once the sheet size has been determined for the first original, copying production efficiency is improved by pre-feeding sheets for the second and subsequent originals at the same time as the original is fed and discharged.

Next, the operation in cover mode will be explained.

FIGS. 4 and 5 show a mode for copying on the cover (FIG. 4) and a cover mode for not copying (FIG. 5) based on input settings from the aforementioned operation section.

In this embodiment, the cover sheet is fed from the upper cassette 151 or the middle cassette 153, whichever contains the sheet of the color specified by the key 627. For example, set A4 size blank paper in the paper deck 201, set A4 size colored paper (for example, pink paper) in the upper cassette, select pink as the desired color using the key 627, and place the original on the document tray 301 of the RDF 300. Place it facing forward. This apparatus starts copying from the end of the document, and the sorter 400 starts copying from the last page upwards.

To explain with reference to FIG. 4, two pages of the original are copied, the next original is replaced, one page is copied, and finally the cover original is copied. Place this last manuscript on the manuscript glass l.
When the paper is fed onto the ot, it can be detected by the recycle lever 309 that the original is the last one. At this time, if a sheet is fed from the upper cassette 151 and copied, a copy as shown in FIG. 4 is completed. If the exposure process is not performed at this time, nothing will be copied onto the sheet surface and it will be output as shown in FIG.

In Fig. 1, a sorter 400 is connected, but this sorter can be separated and used with just the main body and RDF.

When the number of copies is input as 5, the originals are circulated five times to align the pages (this operation is hereinafter referred to as RDF circulation mode). When this RDF circulation mode is combined with the above-mentioned cover mode, it is not known whether the final document (cover document) will be produced, so the advance paper feeding mode cannot operate.

Therefore, when the cover mode is selected, this advance sheet feeding operation is not performed and the copying operation is not performed.

Also, in the RDF circulation mode, copies are made without pre-feeding in the first cycle, the number of originals is counted during this period, the number of originals is memorized, and from the second cycle onwards, copies are made with pre-feeding based on this number of sheets. The first copy of the final manuscript is made in the upper cassette (
If the copying operation is performed by feeding the sheets in advance (from the cover sheet), it is possible to improve production efficiency because the advance feeding is not performed only during the first circulation of the original.

Next, a specific example of the copying operation when the cover mode is selected will be shown. -For example, double-sided copying with n single-sided originals
DF300 is used, and the final paper is placed in a specific cassette 15.
The case where paper is fed from 1 will be explained.

When the copy key 605 is pressed, it is determined whether or not the cover mode has been selected, and if the cover mode has been selected, a cover mode copy operation as described below is performed.

Flowcharts of the cover mode copy operation are shown in FIGS. 6 to 8. Further, FIGS. 9 to 1O show diagrams of cover mode and double-sided copying operation from a single-sided original. copy key is pressed,
If the original is not in auto-count mode and copying is in cover mode, counter n is first cleared (step 6-1). This counter is set in a predetermined area of the RAM 805. Then, the document exchange routine (FIG. 7) is executed (step 6-2), and the counter n is incremented each time (step 5-3). In this actual example, document exchange means <RDF3> as shown in Fig. 7.
Step 7-1) of issuing a document feed request to 00;
The process ends with detecting that the original has been fed onto the platen glass 101 (step 7-2), and the description will be omitted below, and the original will be replaced.

Next, it is determined by the recycle lever 309 whether the fed document is the final document (step 6-4), and if it is not the final document, it is determined whether the counter n is an even number or an odd number (step 6-4). 5). If the number is odd, deck 2
01 or the cassette 153 (Step 5-6), and perform the reverse copy operation (Step 6-7).
, transport the copy paper to the intermediate tray (step 6-8)
. If the counter n is an even number, the paper is fed from the intermediate tray 203 (Step 6-9), and the front side copy operation is performed (
Step 6-10) Eject the sheet (Step 6-1)
1).

Then, for the next copy, the ejected document exchange routine (FIG. 8) is executed, and the document on the platen glass 101 is transferred to the RDF3.
00 onto the loading tray 303 (step 8
-1), the document is replaced (steps 8-2 to 8-3). (
The explanation will be omitted below and will be referred to as ejected document exchange) (Step 6)
-12) Also, if it is the final document in (step 6-4), first eject the sheet if there is one in the intermediate tray 203 (step 6-13. 14), and then specify the paper source for cover mode. Switch to the cassette 151 and feed a specific sheet (steps 15 and 16). Then, if a cover copy color is specified, a cover color specification determination is made (step 6-17) in which a developer of the specified color is selected and set. Then, the front side copy operation is performed (step 6-18), the specific sheet (cover) is ejected (step 6-19), and the RDF3
A document discharge request is issued to 00, the document is discharged onto the stacking tray 303 (step 6-20), and the copying operation is completed.

In this way, when creating a double-sided copy from a single-sided original in cover mode, the copied cover will always be on the front side.

〔effect〕

As explained above, according to the present invention, when the image is formed on only one side of a specific sheet for the cover in the duplex mode, the image is formed on the specific sheet in the single-sided mode, so that the cover is always Images can be formed on the surface, improving usability.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the internal configuration of an image forming apparatus to which the present invention is applied, FIG. 2 is a plan view showing the operation display section of the image forming apparatus, and FIG. 3 is a block circuit showing the control section of the image forming apparatus. 4 is a diagram explaining the mode for copying on the cover, FIG. 5 is a diagram explaining the mode for not copying on the cover, and FIG. 6 is a flowchart showing the flow of control in the case of one copy per 1 original. 7-1 and 7-2 are flowcharts showing the flow of control in the cover mode, FIG. 8 is a flowchart showing the document exchange routine, FIG. 9 is a flowchart showing the ejected document exchange routine, and FIG. 10 is a flowchart showing the document exchange routine. FIG. 11 is a diagram illustrating the state of a sheet when double-sided copying is performed from a single-sided original. FIG. 11 is a diagram showing the state of the sheet when double-sided copying is performed from a single-sided original in cover mode. 100・・・・・・・・・・・・・・・・・・・・・
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・・・・・・・・・・・・・・・・・・・・・Display group 800・・・・・・・・・・・・・・・・・・
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Claims (1)

[Claims] Image forming means operable in a single-sided mode in which an image is formed on one side of a sheet and then ejected, and a screen mode in which an image is formed on both sides of the sheet and then ejected; a feeding unit for feeding a sheet; and control for controlling the image forming unit to form an image on the specific sheet in the single-sided mode if the image formation on the specific sheet is only on one side in the duplex mode; An image forming apparatus comprising: means.