JPH09230650A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To select a further precise interleaf mode based on reproduction setting information and make it practicable by discharging and stacking up transfer papers fed from a first paper sheet stacking means, among a plural number of paper sheet stacking means, and interleaf transfer papers fed from a second paper sheet stacking means, which has the interleaf set each time the original is changed, with respect to the manuscript note at the time of selecting the interleaf mode. SOLUTION: A ROM 501 has a master CPU 500 execution program written therein beforehand. A RAM 502 is used as various kind of working aras and data buffers at the time of executing the program. A key 503 has various keys of the console panel corresponding to it and CPU 500 performs key input detection corresponding to the content allocated to various keys. When the reproduction setting number is two sheets or more under interleaf mode, the interleaf mode, which inserts an interleaf each time an original is changed, is practiced. Interleaf modes making different moves are accurately realized with one key by switching either to an OHP interleaf mode or to other interleaf mode in accordance with the information of number of reproduction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus having a slip sheet function of inserting sheets from a slip sheet tray between transfer sheets.

[0002]

2. Description of the Related Art Conventionally, in an image forming apparatus, there are mainly the following three slip sheet modes as a mode for inserting a slip sheet. (1) What is shown in FIG. 9 as an example of discharging the transfer paper. (2) A slip sheet is inserted every time the original is switched.
This is used for journalizing transfer paper for each original and corresponds to the so-called stack mode of the sorter device. For example, there are a type shown in FIG. 10 as an example of discharge and a type shown in FIG. 11 as an example of discharge. (3) Inserting a slip sheet for a set page for a plurality of originals. In the case of low-priced copiers, there are separate keys for the two slip sheet modes (1) and (2), or slip sheet key and OH
OHP interleaving paper is realized by combining P modes.
Generally, a hard key switch is used. Generally, low-priced machines do not employ touch methods such as LCD and CRT. Further, in order to reduce the number of keys, there are cases where only one of the interleaving paper modes (1) or (2) is prepared.

Further, when only the interleaving paper mode of the above type is installed, when the OHP interleaving paper mode is set, the number of copy sets is designated as 1, and when the transfer paper is face-up paper ejection, The OHP sheets are stacked on the paper tray, and the interleaving paper is set on the second tray other than the interleaving paper tray (see (1) Transfer paper 1 and FIG. 10 in FIG. 9).
If the transfer paper is face-down paper ejection, stack the interleaving paper on the interleaving paper tray and place the OH on the second tray other than the interleaving paper tray.
Set the P sheet (see (2) and FIG. 10 in FIG. 9).

In the case of a further type of interleaving paper mode, OH
When the P interleaving paper mode is set, the number of copy sets is set to 1, and the following operations are executed to execute the OHP of the final document.
After copying to a sheet, in the case of the type, there is no slip sheet for separating the final manuscript, so it is necessary to manually attach the slip sheet. If the transfer paper is face-up discharge,
The OHP sheets are stacked on the interleaving paper tray, and the interleaving paper is set on the second tray other than the interleaving paper tray (see (1) and FIG. 10 in FIG. 9). If the transfer paper is face-down discharge,
The slip sheets are stacked on the slip sheet tray, and the OHP sheet is set on the second tray other than the slip sheet tray (see (2) and FIG. 10 in FIG. 9).

Other conventional examples similar to the present invention are listed below. Japanese Patent Laid-Open No. 2-110077 "Interleaving paper processing device"
Aims to properly insert white paper or colored paper between OHP papers. In addition, JP-A-4-36296
No. 8 "Image recording device" is intended to copy even plain paper in the OHP interleaving paper function.
In the HP interleaving paper mode, image recording on OHP paper, ejection of interleaving paper, and image recording on plain paper are performed for a set number of sheets.

[0006]

However, in the case of the above conventional example, the current interleaf paper mode is the OHP of the above (1).
It is necessary to confirm whether it is the slip sheet mode or the type (2). Further, in the case of the interleaving paper mode of the type (2) for the interleaving paper mode setting, when the OHP interleaving paper mode of (1) is attempted, it is confirmed whether the transfer paper is discharged face up or face down. Therefore, it is necessary to judge whether OHPs or slip sheets are stacked on the slip sheet tray.

[0007] These are accompanied by problems that the operation is complicated and that miscopy is likely to occur. Copiers tend to be more multifunctional, and many keys are provided on the operation unit, and operability tends to become more complicated.

An object of the present invention is to provide an image forming apparatus having a slip sheet mode function with high operability.

[0009]

In order to achieve such an object, the image forming apparatus of the present invention comprises a plurality of sheet stacking means,
Interleaving paper mode selecting means for selecting the interleaving paper mode, and when the interleaving paper mode is selected, the transfer paper fed from the first paper stacking means of the plurality of paper stacking means with respect to the original, and the original every time the original changes. 1st stacking paper is set on the first stacking paper
When the interleaving paper control means is selected and the interleaving paper mode is selected, the transfer paper fed from the first paper stacking means of the plurality of paper stacking means for one document and the second interleaving paper are set. The second stacking sheet control means for alternately discharging and stacking the transfer sheets fed from the sheet stacking means and the copy number setting means for setting the number of copies for one original.

When the slip sheet mode selecting unit selects the slip sheet mode and the copy number setting unit sets one copy number, the second slip sheet control unit executes the slip sheet mode. When the interleaving paper mode is selected by the selecting means and the number of copies is set to 2 or more by the copy number setting means, the first interleaving paper control means may be executed.

Further, when the second slip sheet control means is executed, OHP sheets are stacked on the first sheet stacking portion, and the second slip sheet control means discharges the transfer sheet fed from the sheet stacking means. When the image portion is discharged face-up to the discharge tray to be stacked, paper is fed from the second paper stacking unit in which the interleaving paper is set, and then the first paper is stacked.
The transfer sheets may be discharged from the sheet stacking unit in the order of feeding.

The second slipping paper control means, when the image portion is discharged face down to the discharge tray for discharging and stacking the transfer paper fed from the paper stacking unit, It is preferable that the transfer sheets are discharged from the first sheet stacking unit in the order of feeding the sheets and then from the second sheet stacking unit in which the slip sheet is set.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of an image forming apparatus according to the present invention will be described in detail with reference to the accompanying drawings. FIG.
FIG. 11 to FIG. 11 show an embodiment of the image forming apparatus of the present invention. 1 to 4 are diagrams showing a configuration example in which the image forming apparatus of the present invention is applied to a copying system including a digital copying machine.

In FIG. 1, a digital copying machine 10 is placed on a table 11 and covers a contact document mounting glass 119 for placing a document to be read, which is provided on the top surface of the table 11 to feed a document to the automatic document feeder. A feeder (ADF) 130 and a large-capacity paper feed tray (LCT) 140 at the bottom of the paper feed unit.
However, a double-sided unit 134 is provided on the discharge side of the copying machine body 10.
However, a sorter 118 is attached to the side of the
One copying system is configured.

The main body 10 of the copying machine is roughly divided into a reading section (scanner) 12, a writing section 13 and an image forming section 14 from the top.

The reading section 12 has a contact glass 119.
It is composed of an exposure lamp 113, first to third mirrors 121, 122, 123, an imaging lens 111, and an image reading plate 110, which are provided in the lower part of the. The original placed on the contact glass 119 with the image side facing down is the exposure lamp 1
13 is slit-illuminated, and the reflected light is imaged on the image reading plate 110 via the mirrors 121, 122, 123 and the imaging lens 111, and the first scan carrying the exposure lamp 113 and the first mirror 121. The body and the second scanning body carrying the second and third mirrors 122 and 123 are moved at a predetermined speed to perform reading scanning. Due to this scanning, the original image is
The image is read by a CCD on the image reading plate 110, converted into an electric signal, and is processed by an IPU (Image Processing Uni
t; image processing device) performs image processing and sends to the writing unit 13.

The writing unit 13 is a polygon mirror 1 that rotates at a constant speed by a laser diode and a polygon motor 109.
The laser light oscillated from the laser diode in the optical system composed of 24, f-θ lens and the like is modulated by the image information signal as an electric signal image-processed by the IPU, and the polygon mirror 124, the f-θ lens and so on are modulated. After that, an image is written on the photosensitive drum 101 of the image forming unit 14.

The structure of the image forming unit 14 is the same as that of the image forming apparatus using the known electrophotographic process, and the charging charger 112, the image writing position, and the developing unit 11 are arranged around the photosensitive drum 101 in the order of rotation thereof.
7, a transfer charger 102, a separation charger 103, a separation claw 127, and a cleaning unit 104 are arranged.

The toner image formed on the photosensitive drum 101 by the known electrophotographic process is fed to the paper feed cassette 11.
5 or a large-capacity paper feed tray 140 is sent out by a paper feed roller 116, and is transferred to a transfer paper 125 fed by a registration roller 126 at a timing to a transfer portion under the action of the transfer charger 102. The transfer paper after the transfer is separated from the photosensitive drum 101 by the separation charger 103 and the separation claw 127.

A transfer belt 128 for adsorbing the transfer paper on the surface thereof by the transfer fan 105 and transferring the transfer paper, the fixing unit 107 and the transfer roller 129 are provided in the transfer path of the separated transfer paper.
Are sequentially arranged. The transfer paper 125 separated from the photosensitive drum 101 is fixed to the fixing unit 1 by the transfer belt 128.
After being fixed by 07, it is ejected out of the apparatus by the conveyance roller 129. The ejected transfer paper is transferred to the duplex unit 134.
A switching pawl 131 provided in the sheet receiving portion of the sorter 118 or the duplex unit 1 depending on the copy mode.
The paper is discharged to the double-sided tray 133 in 34.

In the case of the double-sided copy mode, it is necessary to reverse the front and back of the transfer paper 125 on which the single-sided image is recorded and to convey and introduce the transfer paper 125 to the image forming section 14 again. Therefore, the transfer paper 125 ejected by the transport roller 129 is transferred to the switching claw 131.
Thus, it is once discharged to the double-sided tray 133 of the double-sided unit 134 and stocked.

On the double-sided tray 133, a jogger fence for aligning the discharged transfer paper left and right and a vertical movement for sending the leading end (original rear end) of the discharged transfer paper until it abuts against the stop plate. A transfer roller is provided, and the discharged transfer paper is stacked with its front end and left and right aligned.

At the time of re-feeding from the double-sided tray 133, the stop plate is displaced downward by a solenoid (not shown), and the transfer sheet is sent out by the re-feeding roller with its original rear end first, and the transfer sheet passes through the circulation path in the table 11. The transport roller 129 sends the image to the registration roller 126 of the image forming unit 14, feeds it to the transfer unit at a predetermined timing, the image is transferred to the back surface, is fixed, and is then discharged to the tray of the sorter 118.

Next, the flow of the image signal will be described based on the image signal flow chart shown in FIG. As mentioned above,
The original on the contact glass 119 is exposed by the exposure lamp 113, and its reflected light is reflected by the first to third mirrors 121, 1
After passing through 22 and 123, an image is formed on the CCD 110 a in the image reading plate 110 by the image forming lens 111. Here, the CCD 110a is for converting the light and shade of a document into an electric signal, and in the present embodiment, a CCD of 5000 pixels is used.
It has a resolution of 00 dpi. Image reading plate 1
10 has a built-in A / D converter, CCD1
The analog output from 10a is output as a 6-bit (64 gradation) digital signal. The image data output from the image reading plate is sent to the IPU 1 (image processing device) 201.

The IPU 1 (201) performs shading correction and MTF correction of image data,
It has a function of digitizing and counting the number of pixels in the black portion. IPU
The data processed by 1 (201) is temporarily stored in the image memory (RAM) 202. The data on the image memory is read by the IPU 2 (203), and image processing such as scaling processing, black-and-white inversion processing, and halftone processing is performed as necessary. In addition, IPU1 (201) and IPU2 (20
3) is configured to be connected to an image processing main control board 205 for controlling the entire image processing apparatus to exchange data, and what kind of image processing is performed by the IPU1 (201) and the IPU2 (203). Is determined by various commands sent from the main control board 205. Also IPU
1 can send the number of pixels in the black portion of the above-mentioned image data to the main control board 205.

The data image-processed by the IPU 2 is sent to the LD control plate 204, and LD (laser diode)
An image is written on the photoconductor drum 101 by controlling the amount of light emitted from the photoconductor drum 101 according to the data. The laser light from the LD is configured to be scanned on the photosensitive drum 101 by the polygon mirror 124 rotating at a high speed, and one main scanning is performed on one surface of the polygon mirror 124.

The mirror surface of the polygon mirror 124 is ultra-precision processed in order to prevent the laser beam writing position deviation in the main scanning and sub-main scanning directions and to improve the reflection efficiency.

FIG. 3 shows an operation panel 301 on which various switch keys for operating the image recording apparatus are provided. First, on the right side are the print key 302 and the numeric keypad 30.
3, a C / S (clear / stop) key 304 and an interrupt key 305 are provided, and an automatic paper selection key 306 and a paper feed cassette for automatically selecting the paper feed cassette 115 and LCT 140 according to the document size are provided on the left side of the key. A paper selection key 307 for selecting, a paper designation scaling key 308 for automatically enlarging / reducing in accordance with the copy paper size of the selected paper cassette, an equal magnification key 309, an enlargement key 310, and a reduction key 311 are provided. Has been.

Further on the left is OH according to the present invention.
P The interleaving paper mode or the interleaving paper mode key 312 for setting the interleaving paper mode for inserting the interleaving paper every time the document is switched, the page continuous shooting mode key 313, the double-sided copy key 314, and the sort / stack mode key 315 are the mode setting keys. , A display unit 3 for displaying various messages on the upper side of the central portion
16 are provided respectively.

Next, the operation of the ADF (automatic document feeder) 130 will be described with reference to the schematic diagram of the ADF mechanism shown in FIG. When a document is set on the document table 401 on the ADF, document setting detection 402 detects the setting of the document. When the print key 302 of the operation panel 301 is pressed, the pinch roller 403 and the calling roller 404 come into contact with each other, and then the transport roller (not shown) is turned on to rotate the calling roller and feed the original.

When a plurality of originals are fed, only the originals in contact with the separation belt 405 and the separation rollers 406 are fed. The original fed and passed through the separation roller 406 passes through the resist and the original width detection 407, and is sent onto the contact glass 119 by the conveyor belt 408. At this time, the paper size of the original is detected by the length detection 409, the resist, and the original width detection 407.

On the other hand, the original sent on the contact glass 119 is stopped at the exposure position by stopping the conveyance motor when the length detection 409 is reached. The exposed original is ejected by the conveyance motor and a paper ejection motor (not shown) rotating to lower the stop claw, and the next original is fed again. In the case of exposing the back surface of the double-sided original, after the exposure of the front surface is completed, it is conveyed around the reversing roller 410 (the reversal switching claw 411 is raised at this time) onto the contact glass again. The originals discharged after the exposure is stored in the original receiver 413.

FIG. 5 shows a block diagram of the configuration of the image forming apparatus according to the embodiment. In FIG. 5, reference numeral 500 denotes a master CPU that controls the entire image forming apparatus. ROM 501
Is pre-written with a program to be executed by the master CPU. The RAM 502 is used as various working areas and data buffers when the program is executed. The keys 503 correspond to various keys provided on the operation panel shown in FIG. 3 described above, and the CPU 500 performs key input detection according to the contents assigned to the various keys.

The driver array 505 drives a drive circuit 506 such as an exciting coil of a motor, a solenoid or other switches.

The master CPU 500 also controls each drive circuit via the I / O port 504. This controls various mechanical systems such as selective paper feeding from a plurality of paper feeding units, document feeding, and rotation of the photosensitive drum.

Further, the master CPU is the I / O port 507.
The states of various sensors 508 are read via. Thus, the state of various mechanical systems such as the sheet loading state of the sheet feeding unit and the document feeding state of the automatic document feeder are monitored.

Further, the master CPU 500 transmits / receives commands to / from a CPU (not shown) of the image processing main board 205 (see FIG. 2) for control via the serial communication control unit 509, for example. For example, the writing process can be performed on the photosensitive drum by instructing the editing content of the image and the writing timing.

<Description of Operation Flow> Next, an operation example will be described with reference to the flowchart of FIG. First, in step S1,
In S3, S5, and S11, the main CPU 500 performs the input acceptance processing of the key 503 of FIG. 5, specifically, the various key switches of FIG. 3 while the image recording apparatus is on standby.

In step S1, the input of the ten key 303 for setting the number of copies in FIG. 3 is checked, and the input data is stored in the variable “SetNum” provided in the RAM 502 of FIG. Then, the process jumps to step S1 to detect the key input again.

In step S3, the input of the key 312 for instructing the interleaf sheet mode setting of FIG. 3 is checked, and when the main CPU 500 determines that the interleaf sheet mode is set, it is provided on the RAM 502 of FIG. “SET” is set in the variable “fSlip” that stores the set interleaving paper mode setting state.
Write and store. Then, the process jumps to step S1 to detect the key input again.

In step S5, it is determined whether the print key 302 shown in FIG. 3 for instructing the start of the copying operation has been pressed.

If No in step S5, step S11
The other key input determination process of FIG. 3 is executed, and the process jumps to step S1 to detect the key input again.

If Yse in step S5, the copying operation is started. Here, before starting copying in steps S6 and S7,
The variable fSlip detected and determined in steps S1 and S3,
The SetNum data is evaluated.

First, in step S6, it is determined whether or not the slip sheet mode is set, and if No, copying other than the slip sheet is executed in step S10. This mode is outside the scope of the present invention and is well known, so the description thereof will be omitted.

In step S7, when the slip sheet mode is designated, the copy mode to be executed differs depending on whether the copy setting copy number is 1 or not.

The contents of the copy mode will be described with reference to FIGS.

<When the interleaving paper mode is designated and the number of copy settings is 1> Under the above conditions, the (1) OHP interleaving paper mode (Fig. 9).

This is because the number of copy settings is 1 in the slip sheet mode.
In the case of, the OHP interleaving paper mode of FIG.
When it is determined whether or not to execute a slip sheet mode (corresponding to a so-called stack mode of the sorter device) in which a slip sheet is inserted every time the original document is switched and is used for journalizing transfer sheets for each original document, the slip sheets in FIGS. Paper mode is set to 1 copy
At that time, it does not make sense to insert a slip sheet after copying one sheet from the original.

Therefore, when the copy setting copy number is 1, it is more natural to consider that the operator requests the OHP interleaving paper mode. It is considered that interleaving paper is installed in the interleaving paper tray and OHP sheets are installed in trays for feeding paper other than the interleaving paper.

Therefore, under the above conditions, the OHP interleaving paper mode is executed instead of the interleaving paper mode as shown in FIGS.

FIG. 7 shows the operation flow.
In terms of content, the procedure shown in FIG. 9 is the order of discharge. One thing to note here is that the transfer paper is discharged with the image side facing up (corresponding to face-up discharge: 1), as shown in (1) and (2) of FIG. Depending on whether the image side is discharged (equivalent to face-down discharge: 2), the order of sheet feeding from the interleaving paper tray and sheet feeding from the tray on which the OHP sheets are stacked is changed, and the sheet is correctly discharged. The point is that it is controlled like this.

The difference between face-up and face-down is, for example, in the case of one-sided copying, when there is no so-called reversing device for reversing the front and back of the transfer paper in the main body of the copying machine or in the post-processing device, a face-up output is given. .

Explaining in the example of FIG. 1, the paper feed cassette 11
The transfer paper fed from No. 5 is the transfer belt 12 on the conveyance path.
8 through the transport roller 129, and discharges the image side up to the discharge tray of the sorter 118 (face-up discharge)
Is done.

On the other hand, for example, a transfer roller 1 is provided on the transfer paper transfer path.
If a reversing device for reversing the front and back of the transfer sheet is provided between the sheet discharging tray of 29 and the sorter 118 and the reversing operation is performed, the transfer tray face down with the image side facing down on the sheet discharging tray of the sorter 118. The paper is discharged.

<When the interleaf sheet mode is set and the copy setting number is set to 2 or more> Under the above conditions, the (2) original document shown in the column of "Problems to be solved by the invention" is switched every time the document is switched. It is configured to execute a slip sheet mode for inserting a paper sheet (see the discharge example in FIGS. 10 and 11).

This is because the copy setting number is 2 in the slip sheet mode.
In the above case, a plurality of sheets of the same original document OHP are usually discharged by inserting slip sheets.
It is not common to copy sheets, and it is considered that the operator expects the slip sheet mode shown in FIGS. Therefore, the interleaving paper mode of FIG. 10 and FIG. 11 is used for inserting the interleaving paper every time the originals are switched and used for journalizing the transfer paper for each original (corresponding to the so-called stack mode of the sorter device).

FIG. 8 shows an operation flow of the discharge example shown in FIG. First, a copy operation is performed on plain paper for the number of copies of the original (S42 to S45), and a slip sheet is inserted at the end of copying the number of copies (S46 to 49). Then, the originals are switched and the same operation is executed until the originals are exhausted.

Although FIG. 8 shows the example of FIG. 10, if the interleaf sheet mode of FIG. 11 is to be executed, a “check for the presence of the next original” is added between step S42 and step S46 to indicate that the next original exists. If so, step S46 is executed, and if not, step S50 is executed.

As described above, in the interleaf sheet mode, the OHP interleaf sheet mode or the other interleaf sheet modes can be switched according to the copy number information, and the interleaf sheet mode with different movements can be accurately realized with one key.

According to the above embodiment, the number of keys is not increased, and the operability is not impaired.
With two keys, two interleaving paper modes (1) and (2) can be correctly and simultaneously performed. Further, even with only one slip sheet mode hard key, it is possible to execute the slip sheet mode in accordance with the user's request, and it is possible to realize the slip sheet mode with excellent operability without miscopy.

Further, in the OHP interleaving paper mode, when the transfer paper is discharged face up, when the interleaving paper and the OHP sheet are alternately fed, the interleaving paper is fed first and then the OHP sheet is fed. . Therefore, the slip sheet can be inserted accurately on the image surface without causing a page error, and the OH
The P interleaving paper mode can be executed.

[0062]

As is apparent from the above description, in the image forming apparatus of the present invention, when the interleaving paper mode is selected, the original is fed from the first paper stacking means of the plurality of paper stacking means. The transfer paper and the interleaf transfer paper fed from the second paper stacking unit in which the interleaf paper is set each time the original is changed are discharged and stacked. Further, the transfer paper fed from the first paper stacking means of the plurality of paper stacking means and the transfer paper fed from the second paper stacking means in which the interleaving paper is set are alternated with respect to one original. Dispose the discharged paper on. Therefore, by having a plurality of slip sheet modes, it becomes possible to select and execute a more accurate slip sheet mode based on the copy setting information.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an overall configuration in which an embodiment of an image forming apparatus of the present invention is applied to a digital copying machine.

FIG. 2 is a functional block diagram of FIG.

FIG. 3 is an external plan view of an operation unit.

FIG. 4 is a vertical sectional view showing the configuration of an ADF mechanism section.

FIG. 5 is a circuit configuration block diagram.

FIG. 6 is a flowchart showing an operation example.

FIG. 7 is a flowchart showing a subroutine of FIG.

FIG. 8 is a flowchart showing a subroutine of FIG.

FIG. 9 is a conceptual diagram for explaining an example of discharging a transfer sheet.

FIG. 10 is a conceptual diagram for explaining an example of discharging a type of transfer paper.

FIG. 11 is a conceptual diagram for explaining an example of discharging a type of transfer paper.

[Explanation of symbols]

10 digital copying machine 11 table 12 reading unit (scanner) 13 writing unit 14 image forming unit 101 photoconductor drum 109 polygon motor 110 image reading plate 111 imaging lens 113 exposure lamp 118 sorter 119 contact glass 121, 122, 123 first mirror , Second mirror, third mirror 124 polygon mirror 130 automatic document feeder (ADF) 134 duplex unit 140 large-capacity paper feed tray (LCT) 301 operation panel 302 print key 401 document table 402 document set detection 403 pinch roller 500 master CPU 501 ROM 502 RAM 503 Key 504 I / O Port 505 Driver Array 506 Drive Circuit 507 I / O Port 508 Various Sensors 509 Serial Communication Control Unit

Claims (5)

[Claims] 1. A plurality of paper stacking means, a slipping paper mode selecting means for selecting a slipping paper mode, and a first paper stacking means of the plurality of paper stacking means for a document when the slipping paper mode is selected. First interleaving paper control means for discharging and stacking the transfer paper fed from the means, and interleaving paper transfer paper fed from the second paper stacking means in which interleaving paper is set every time the original is changed, When the slip sheet mode is selected, the transfer sheet fed from the first sheet stacking means of the plurality of sheet stacking means for one document and the second sheet stacking means on which the slip sheet is set An image forming apparatus comprising: a second slip sheet control means for alternately discharging and stacking the transfer sheets fed from the sheet; and a copy number setting means for setting the number of copies for the one original. 2. When the interleaving paper mode is selected by the interleaving paper mode selecting means and one copy is set by the copy number setting means, the second interleaving paper control means is executed to execute the interleaving paper control. 2. The first interleaving paper control means is executed when the interleaving paper mode is selected by the paper mode selecting means and the number of copies is set to 2 or more by the copy number setting means. Image forming device. 3. The image forming apparatus according to claim 2, wherein OHP sheets are stacked on the first sheet stacking unit when the second slip sheet control unit is executed. 4. The second slipping sheet control means discharges the transfer paper fed from the paper stacking means in a state in which the image portion is face-up on a discharge tray for stacking. , The transfer paper is discharged in the order in which paper is fed from the second paper stacking unit in which the interleaving paper is set, and then paper is fed from the first paper stacking unit. The image forming apparatus according to claim 2. 5. The second slipping sheet control means discharges the transfer sheet fed from the sheet stacking section with the image section face down on a discharge section tray on which the transfer sheet is stacked. In this case, the transfer paper is ejected in the order in which the paper is fed from the first paper stacking unit and then the paper is fed from the second paper stacking unit in which the interleaving paper is set. The image forming apparatus according to claim 2.