JPH10222013A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely realize a copying job by a layout which a user intends for a document read even when a memory is full by performing image forming for the document stored by an image storing means in accordance with the total number of documents counted and the content of the copying job. SOLUTION: Binarized image data is fed to a control part 303, and is stored at an image storing part 304, and an outputting mode is simultaneously selected. In the case of both-side copying, read is orderly performed from the last page to the first page of the document bundle of a RDF, and all documents are temporarily stored in a hard disk. Then, the number of the document bundle is defined, and if the number of the document bundle is even, the last page and the next page of the document are read on the last page of printing paper and are printed on front and rear surface, and if the number of the document bundle is odd, only the last page of the document is read, and is printed only on the front surface. Then, printing is performed while reading in descending order to the first page of the document.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital copying machine having an electronic sorting function.

[0002]

2. Description of the Related Art Conventionally, an image is read out of an image of all originals to be copied, the image data is temporarily stored in a memory such as a hard disk, and image data of an arbitrary original is repeatedly read out from the memory and printed out. 2. Description of the Related Art Digital copiers having a sorting function are known. Accordingly, it is possible to discharge copy sheets in a sorted state without having a sorter device having a plurality of bins.

However, a memory such as a hard disk for storing image data is limited, and the number of documents that can be stored is also limited in advance. For example, if the memory is A4
If the original bundle is A4 and 102 sheets, the original for 100 sheets can be stored in the memory.
The number of sheets cannot be stored (memory full).

On the other hand, the original is fed onto the original platen one page at a time from the last page of the original bundle on the original tray, and thereafter,
A recirculating automatic document feeder (RDF) that can be returned to a document tray is known.

When an original is pulled into the original platen using such an RDF and the read image is stored on the hard disk, if the memory becomes full on the way, for example, in the case of a double-sided job, the last page is displayed. I didn't know what to do or what to do, so I canceled the copy job. Similarly, in the reduced layout, since it is not possible to determine the position from the last page to be laid out, the copy job is canceled.

[0006]

However, in the case of the conventional method, if the memory becomes full on the way, a job that cannot be executed for the documents in the memory unless the total number of documents is known, for example, double-sided, reduced layout Etc. cannot be printed at all.

After the memory becomes full, it is necessary to perform the following cumbersome procedures when performing a double-sided copy while dividing the document bundle so that the memory is not full.

(1) The total number of originals is counted by hand to check whether the number is an even number or an odd number.

(2) From the last page to the full page, if the entire original bundle is an even number, an even number is set, and if the odd number is an odd number, an odd number is set, and both sides are copied for a desired number of copies.

(3) Duplex copying is performed for the desired number of copies for the remaining pages set in (2).

Similarly, in the case of the reduced layout, after the memory becomes full, when the reduced layout (Nin1) copy is performed by dividing the document bundle so as not to be full, the following cumbersome procedure is performed. Needed.

(1) Count the number of sheets of the whole document bundle by hand.

(2) Divide the number by N to obtain a remainder M.

(3) Assuming that the number of pages from the last page to the full page is L, R = N * INT ((LM) / N) + M is calculated, R sheets are set from the last page, and the desired number is set. Copy Nin1 for the number of copies.

(4) For the remaining pages set in (2), two-sided copying is performed for a desired number of copies.

According to the present invention, when a document is read into a memory such as a hard disk or the like, even when the memory becomes full, an image which can reliably realize a copy job with a layout intended by the user for the read document is provided. It is an object to provide a forming device.

[0017]

An image forming apparatus according to the present invention comprises: a document feeder capable of feeding a document from the last page of a document bundle on a document tray onto a document table and returning the document to the document tray; Counting means for counting the number of sheets fed by the document feeding means, image reading means for reading an image of a document sent from the document feeding means onto a platen, image storage means for storing the image in a memory, A printing unit that reads an image of a document stored in the image storage unit and forms an image, and stores the image data in the image storage unit. When the image storage unit becomes full, the document in the document tray is read. First control means for circulating the remaining documents which have not yet been sent to the platen, and counting the number of sheets of the entire document bundle by the counting means; Therefore, according to the counted number of sheets of the entire document bundle and the content of the copy job, a second control unit for reading the original stored in the image storage unit and forming an image by the printing unit is provided. Features.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view showing an example of the structure of an image forming apparatus according to an embodiment of the present invention.
80.

The document table 101 is for placing a document as a document table. The scanner 102 includes a document illumination lamp 103, a scanning mirror 104, and the like. The scanner 102 is reciprocally scanned in a predetermined direction by a motor (not shown), and the reflected light of the document passes through the lens 108 via the scanning mirrors 104 to 106. Then, an image is formed on the CCD sensor 109.

The exposure control unit 107 is composed of a laser, a polygon scanner, or the like, and is converted into an electric signal by the image sensor unit 109, and is modulated based on an image signal which has been subjected to predetermined image processing described later. Is irradiated on the photosensitive drum 110.

Around the photosensitive drum 110, a primary charger 112, a developing device 121, a transfer charger 118, a cleaning device 116, and a pre-exposure lamp 114 are provided. In the image forming section 126, the photosensitive drum 110
Is rotated by a motor (not shown) in the direction of the arrow shown in the figure. After being charged to a desired potential by the primary charger 112, the laser beam 129 from the exposure control unit 120 is irradiated, and the electrostatic latent An image is formed.

The electrostatic latent image formed on the photosensitive drum 110 is developed by the developing device 121 and is visualized as a toner image. On the other hand, pickup rollers 133 and 134 from the upper cassette 131 or the lower cassette 132.
Transfer paper fed by the paper feed rollers 135 and 136
Is transferred to the transfer belt by the registration roller 137, and the visualized toner image is transferred to the transfer paper by the transfer charger 118. After the transfer, the photosensitive drum is cleaned of residual toner by a cleaner device 116, and residual charges are erased by a pre-exposure lamp 114.

The transfer paper after the transfer is separated from the transfer belt 130, the toner image is recharged by pre-fixing chargers 139 and 140, sent to a fixing device 141, fixed by pressure and heat, and discharged by a discharge roller 142. Is discharged out of the main body 100.

The attraction charger 138 attracts the transfer paper sent from the registration roller to the transfer belt 130, and the transfer belt roller 139 is used to rotate the transfer belt 130, and at the same time, the attraction charger 138 The transfer paper is adsorbed and charged on the transfer belt 130 in pairs.

The main body 100 is provided with a deck 150 capable of storing, for example, 4000 transfer papers. The lifter 151 of the deck 150 rises according to the amount of transfer paper so that the transfer paper always contacts the paper feed roller 152. Also, a multi-bypass tray 153 capable of storing 100 transfer papers.
Is equipped.

Further, in FIG.
Reference numeral 4 is for switching the path between the double-sided recording side or the multiple recording side and the paper discharge side. The transfer paper fed from the paper discharge roller 142 is switched by the paper discharge flapper 154 to a double-sided recording side or a multiple recording side. Further, the lower transport path 158 guides the transfer sheet sent out from the sheet discharge roller 142 to the re-feed tray 156 by turning over the transfer sheet via the reversing path 155. The multiplex flapper 157 switches the path between double-sided recording and multiplex recording. By inverting the path to the left, the transfer paper is directly guided to the lower transport path 158 without passing through the reverse path 155.

The paper feed roller 159 feeds the transfer paper to the photosensitive drum 126 through the path 160.
The discharge roller 161 is disposed near the discharge flapper 154, and discharges the transfer sheet switched to the discharge side by the discharge flapper 154 to the outside of the apparatus.

At the time of double-sided recording (double-sided copying) or multiple recording (multiple copying), the discharge flapper 154 is raised upward, and the copied transfer paper is turned over via the transport paths 155 and 158 to re-feed the tray. 156. At this time, at the time of double-sided printing, the multiplex flapper 157 is tilted to the right, and at the time of multiplex printing, the transfer sheets stored in the re-feed tray 156 are fed one by one from the bottom by the feed roller 159 via the path 160. It is guided to a registration roller 137 of the main body.

When the transfer sheet is inverted and discharged from the main body, the discharge flapper 154 is raised upward, and the flapper 157 is moved.
Is tilted to the right, the copied transfer paper is transported to the transport path 155 side, and after the rear end of the transfer paper has passed the first feed roller 162, it is transported to the second feed roller side by the reversing roller 163. Then, the transfer paper is turned over by the discharge roller 161 and discharged outside the apparatus.

FIG. 2 is a block diagram showing the structure of the image forming apparatus according to this embodiment.

In FIG. 2, the image reading unit 201 includes:
It comprises a CCD sensor 109, an analog signal processing unit 202, and the like.
The original image formed on the
It is converted into an analog electric signal. The converted image information is input to an analog signal processing unit, where sample and hold, dark level correction, etc. are performed.
Digital conversion (A / D conversion) is performed. The digitized signal is input to the electronic sorter unit 203 after shading correction (variation of a sensor for reading a document and correction of light distribution characteristics of a document illumination lamp) and scaling processing.

The electronic sorter unit 203 performs correction processing necessary for an output system such as γ correction, smoothing processing, edge enhancement, other processing, processing, and the like.
Is output to

The printer unit 204 comprises an exposure control unit 120 composed of a laser or the like shown in FIG. 1, an image forming unit 126, a transfer paper transfer control unit, etc., and records an image on the transfer paper based on an input image signal. I do.

Further, the CPU circuit section 205
6, the ROM 207, the RAM 208, and the like, and controls the image reading unit 201, the electronic sorter unit 203, the printer unit 204, and the like, and controls the sequence of the apparatus in a comprehensive manner.

FIG. 3 is a block diagram showing a detailed configuration of the electronic sorter unit 203.

The image sent from the image reading unit 201 is input as black luminance data,
Sent to conversion section 301. A log converter 301 converts an input luminance data into an LU for converting the input luminance data into density data.
T is stored, and the luminance data is converted into density data by outputting a table value corresponding to the input data.

Thereafter, the density data is sent to the binarizing section 302. The binarization unit 302 binarizes the multi-valued density data, and the density value becomes “0” or “255”. The binarized 8-bit image data is converted into 1-bit image data of "0" or "1", and the amount of image data stored in the memory is reduced.

However, when an image is binarized, the number of gradations of the image is changed from 256 gradations to two gradations. Therefore, binarization of image data having a large number of halftones such as a photographic image generally deteriorates the image. Remarkable. Therefore, it is necessary to perform pseudo halftone expression using binary data. Here, an error diffusion method is used as a method for pseudo-halftone expression using binary data.

According to this method, when the density of a certain image is larger than a certain threshold value, the density data is determined to be "255", and when the density is equal to or less than a certain threshold value, the density data is determined to be "0". In this method, the difference between the actual density data and the binarized data is distributed to surrounding pixels as an error signal. The distribution of the error is performed by multiplying a weight coefficient on a matrix prepared in advance by an error generated by the binarization and adding the multiplied error to surrounding pixels. As a result, the density average value of the entire image is stored, and the halftone can be represented in a pseudo binary manner.

The binarized image data is supplied to the control unit 303.
Sent to Here, a mode (direct mode) in which image data is stored in the image storage unit 304 at the same time as outputting the image in parallel according to a command from the main body,
The image of the original to be copied is temporarily stored in the image storage unit 304 without being output at the time of reading.
The mode in which the image data is read from and output is selected. For example, in the case of sorting, the first set is processed in the former mode, and the second and subsequent sets are processed in the latter mode.
Reduced layout, pamphlet mode (weekly magazine binding)
For example, if output paper cannot be generated until all originals have been read, processing is performed only in the latter mode. The present invention is effective in the latter mode.

The image storage unit 304 has a SCSI controller and a hard disk (memory), and writes image data to the hard disk according to a command from the SCSI controller. The plurality of image data stored on the hard disk are output in an order according to the editing mode specified by the operation unit of the copying machine.

For example, in the case of sorting, the first copy is RD
The document is read in order from the last page to the first page of the document bundle of F, and printed while being stored in the hard disk. From the second copy onward, the image data of the original stored for the first copy is read from the hard disk and printed in order from the last page to the first page. Thereby, it can play the same role as a sorter having a plurality of bins.

In the case of double-sided copying, the original is read sequentially from the last page of the RDF original bundle to the first page, and all originals are temporarily stored in the hard disk. Then, the number of original bundles is determined.If the number of original bundles is even, the last page of the original and the next page are read from the hard disk on the last page of print paper, printed on the front and back, and the number of original If is an odd number, read the last page of the manuscript and print only the front. After that, it is sufficient to print on both sides while reading in descending order toward the first page of the document (see FIG. 4).

In the case of the reduced layout, the original is read sequentially from the last page of the RDF original bundle to the first page, and all the originals are temporarily stored in the hard disk. Then, since the number of original bundles is determined, in the case of the Nin1 reduced layout, the last page of the print paper is read from the last page of the hard disk in the order of the first page from the last page of the hard disk with respect to the remaining number of original sheets divided by N. The layout may be laid out, and for the other print papers, the subsequent document may be read toward the first page, reduced in Nin1, and printed. For example, 1
~ P. When 4 in 1 originals are printed, 10, p. 9
Lay out on the top of 4in1 of the third page print paper, 8-P. 5 on the second page of print paper,
P. 4-P. 1 to lay out 4in1 on the first page of print paper (see FIG. 5).

The image data called from the image storage unit 304 and the image data not stored in the image storage unit 304 are sent to the smoothing unit 305. In the smoothing unit 305,
First, 1-bit data is converted into 8-bit data, and the image data signal is set to "0" or "255".

The converted image data is replaced with a weighted average value obtained by summing the values obtained by multiplying the coefficients on the predetermined matrix by the density values of the neighboring pixels. As a result, the binary data is converted into multi-valued data in accordance with the density value of the neighboring pixels, and an image quality closer to the read image can be reproduced. The smoothed image data is input to the gamma correction unit 306. When outputting density data, the γ correction unit 306 performs conversion using an LUT in consideration of the characteristics of the printer, and adjusts the output according to the density value set by the operation unit.

FIG. 6 shows a circulation type automatic document feeder (RD).
It is sectional drawing which shows the structure of F).

In FIG. 6, a document stacking tray 1 is a tray on which documents S are stacked and set. The tray 1 is for placing a bundle of originals, and is arranged to be inclined downward as it goes in the original sending direction so that the original sending side becomes lower. As a result, the fed originals are stacked in the feeding direction.

The half-moon roller 3 is rotated in the direction of the arrow to feed the original to the downstream separating section. When there is no original on the tray 1, the cut-off portion is stopped so that the cutout portion is directed upward. Have been.

The paper feed roller 6 is rotated in the direction of the arrow to
The original sent from the tray 1 is fed. The separation rollers 7 and 8 rotate the separation belt 9 in the direction of the arrow to separate the lowermost document among the documents stacked on the tray 1 with the feeding roller 6. The feed roller 6 and the separation belts 7 and 8 constitute a separation and supply unit.

The original sent from the separation / feed unit is fed by feed rollers 1 which are driven by a feed motor 10a and are pressed against each other.
1 and 12, and are fed onto the document table 101 by the rotation of the roller in the direction of the arrow. Also, the feeding motor 1
0a is a discharge first roller 13a, a discharge second roller 13b
Also serves as a drive for.

The entire belt 18 on the platen 101 is an endless belt having a width large enough to cover the entire surface of the sheet document. The surface of the belt 18 is slid on the platen 101 by frictional force to move in the direction of the arrow. It has a sufficient coefficient of friction so that it can be conveyed, and is applied to the drive roller 16 and the turn roller 17 so that the entire belt 18 and the drive roller 16 do not slip.

The first discharge roller 13a is
The document ejected from the original document table 101 by the movement of the arrow of the entire surface belt 18 is rotated in the direction of the arrow to pinch and convey the document. The document is discharged to the document tray 1 between the discharge second rollers 13b.

The recycle lever 19 is for detecting the last original, and FIG. 7 is a cross-sectional view when viewed from a direction of 90 degrees counterclockwise with respect to FIG. In FIG. 7, before starting copying, the recycle lever 19 is
At the start of copying, the recycle lever is placed on the placed document bundle at the position indicated by the solid line in the figure (dotted line in FIG. 7).
When the last document is fed from the document tray, it is detected that the recycle lever is dropped by its own weight (the state indicated by the solid line in FIG. 7), and it is detected that the document bundle has been copied once.

The recycle lever 19 is connected to a recycle motor 20a.
0c is connected to generate a pulse in accordance with the rotation of the recycle lever 19. The recycle lever 19 is provided with a notch for detecting a reference position, and the recycle lever reference position detection sensor is turned on at the reference position (the state indicated by the solid line in FIG. 7). Whether the recycle lever is in a dotted line state or a solid line state can be detected by the recycle lever reference position detection sensor.

During the cycle of the document bundle, the documents above the recycle lever 19 are documents that have been fed after being fed onto the platen, and the documents below the recycle lever 19 are still under the recycle lever 19. The document is not fed on the platen.

Next, a control operation when the memory is full in a double-sided copy job in this embodiment will be described with reference to the flowchart of FIG.

In step 1 (S1), the lowermost document in the bundle of RDF documents is fed onto a document table and scanned. Then, the scanned image is binarized and stored in the hard disk.

In step 2 (S2), it is determined whether or not the hard disk is full, and if not, it is determined in step 3 (S3) whether all the originals have been stored in the hard disk.

If all the originals have not been stored in the hard disk, the process returns to step 1 (S1) and the reading of the originals is repeated. When all the originals have been stored in the hard disk, step 5 (S5)
Proceed to.

If the hard disk becomes full in step 2 (S2), the remaining originals are counted in step 4 (S4). Specifically, the operation of feeding the remaining originals below the recycle lever 19 of the RDF to the original platen, returning the originals to the original stack without moving the scanner,
This operation is repeated until the recycling lever 19 falls under its own weight.
The document number counter counts up sequentially from the last page of the document bundle, so that the number of all documents in the document bundle can be known.

If the total number of originals is an even number in step 5 (S5), originals are read from the hard disk two by two in ascending order in step 6 (S6), and both sides are printed on the front and back sides. If the total number of originals is an odd number, the last page of the print paper is single-sided, so that in step 8 (S8), the last page of the original is first printed on the front of the print paper.

At step 7 (S7), it is determined whether the first page of the document has been read and printed, and if not completed, the process is repeated from step 6 (S6). When the printing is completed, it is determined in step 9 (S9) whether the specified number of copies have been printed.
Return to 5) and repeat.

Next, the control operation when the memory is full in the reduced layout (Nin1) copy job in this embodiment will be described with reference to the flowchart of FIG.

In step 11 (S11), the lowermost document of the RDF document bundle is fed onto a document table and scanned. Then, the scanned image is binarized and stored in the hard disk.

In step 12 (S12), it is determined whether or not the hard disk is full. If not, it is determined in step 13 (S13) that all the originals have been stored in the hard disk and have been finished. If all the originals have not been stored in the hard disk, the process returns to step 11 (S11) and the reading of the originals is repeated. When all the originals have been stored in the hard disk, the process proceeds to step 15 (S15).

When the memory of the hard disk becomes full in step 12 (S12), the remaining documents are counted in step 14 (S14). Specifically, the operation of feeding the document below the recycle lever 19 of the RDF to the document table and returning the document to the document stack without moving the scanner is repeated until the recycle lever 19 falls by its own weight. The document number counter counts up sequentially from the last page of the document bundle, so that the number of all documents in the document bundle can be known.

In the case of the reduced layout of Nin1, if the total number of originals is divisible by N in step 15 (S15), in step 16 (S16), the originals are read from the hard disk N by N in ascending order and printed in Nin1. If the total number of documents is not divisible by N, step 18 (S1
In step 8), the last page of the print sheet is read out from the last page of the document by the number of remaining pages in order and printed in Nin1. For example, when the total number of documents is 10 and 4 in 1, as shown in FIG. 9, p. 10 is laid out.

At step 17 (S17), it is determined whether the first page of the document has been read and printed, and if not completed, the process is repeated from step 16 (S16). If the printing has been completed, it is determined in step 19 (S19) whether the specified number of copies have been printed, and the process returns to step 15 (S15) and is repeated until the specified number of copies have been printed.

[0070]

As described above, claim 1 of the present application.
According to the invention, when the document is fed from the last page of the RDF and the document image is written in the memory such as the hard disk of the electronic sorter, even after the memory becomes full, the RDF continues to circulate the document, By counting the total number of the document bundle, it is possible to determine the place where printing is performed on the print sheet from the last page. For this reason, it is possible to print the desired number of copies on the original stored in the memory in the layout intended by the user, and to re-count the total number of originals, and This has the effect of saving the trouble of resetting the originals according to the number of originals up to the memory full, and the wasteful time of starting a copy job for the originals.

According to the invention of claim 2 of the present application,
By stopping the scanner while the RDF continues to circulate the document and count the number of sheets, wasteful power consumption can be suppressed and the life of the lamp and the mechanism can be extended.

According to the invention of claim 3 of the present application,
In a two-sided job, when the original is fed from the last page of the RDF and the original image is written to the memory such as the hard disk of the electronic sorter, even after the memory becomes full, the RDF continues the circulation of the original and the original bundle By counting the total number of pages, it is possible to determine a place where printing is to be performed on print paper from the last page. For this reason, when the total number of originals that can be stored in the memory is even, the last page is printed on the back side when the total number of originals is even, and when the total number of originals is odd, the last page is printed on the front side. The desired number of copies can be printed on both sides with the intended front and back sides, and the number of originals can be recounted as before, and the number of originals up to memory full depends on whether the total number of originals is odd or even. In this case, there is an effect that it is possible to save the trouble of resetting the original and the wasteful time of starting a copy job for the original.

According to the invention of claim 4 of the present application,
In the reduced layout (Nin1) job, when the original is fed from the last page of the RDF and the original image is written in the memory such as the hard disk of the electronic sorter, even if the memory becomes full, the RDF circulates the original. continue,
By counting the total number of the document bundle, it is possible to determine the place where printing is performed on the print sheet from the last page. For this reason, if the total number of originals that can be stored in the memory is divisible by N, the N originals are reduced in layout starting from the last page, and N
If the remainder is M, it is possible to reduce the layout of M pages from the last page, and then print the document in a reduced layout of N pages each time. R = N * INT ((L−M) / N) + M is calculated from the remainder M obtained by dividing the total number of original documents by N and the number L of pages from the last page to the full page. This has the effect of reducing the time and effort of redoing and the wasteful time of starting a copy job for the original.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a structural example of an image forming apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a structure of an image forming apparatus according to the embodiment.

FIG. 3 is a block diagram showing a detailed configuration of an electronic sorter unit in the embodiment.

FIG. 4 is an explanatory diagram illustrating an operation at the time of double-sided copying in the embodiment.

FIG. 5 is an explanatory diagram for explaining an operation at the time of reduced layout in the embodiment.

FIG. 6 is a cross-sectional view showing a configuration of a circulating automatic document feeder in the embodiment.

FIG. 7 is a sectional view showing a part of the circulating automatic document feeder in the embodiment.

FIG. 8 is a flowchart illustrating an operation at the time of duplex copying in the embodiment.

FIG. 9 is a flowchart illustrating an operation at the time of reduced layout in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Original loading tray, 19 ... Recycle lever, 100 ... Copying apparatus main body, 180 ... Circulating automatic original feeder, 201 ... Image reading part, 202 ... Analog signal processing part, 203 ... Electronic sorter part, 204 ... Printer part, 205: CPU circuit section, 206: CPU, 207: ROM, 208: RAM.

Claims (4)

[Claims] 1. A document feeder capable of feeding a document from a last page of a document bundle on a document tray onto a document table and returning the document to the document tray, and counting the number of sheets fed by the document feeder. Counting means, image reading means for reading an image of the document sent from the document feeding means onto the document table, image storage means for storing the image in a memory, and an image of the document stored in the image storage means. reading,
When the image data stored in the image storage unit reaches a predetermined amount by the printing unit that forms an image and the storage of the image data in the image storage unit, the image data is still being sent to the original platen on the original tray. A first control unit that circulates the remaining originals and counts the total number of originals by the counting unit; a first control unit that counts the total number of originals counted by the control of the first control unit; And a second control unit for forming an image by the printing unit in accordance with the image data stored in the image storage unit. 2. The image forming apparatus according to claim 1, wherein in the first control unit, when circulating the remaining document after the image storage unit is full, the scanner is stopped. 3. The copying machine according to claim 1, wherein the copy job is in a double-sided mode, and when the number of the entire document bundle is an even number, the second control unit sets the last page to the back side and sets the number of the entire document bundle to an odd number. An image forming apparatus, wherein the last page is printed as a front surface. 4. The reduced copy mode according to claim 1, wherein the copy job is a reduced layout mode in which a maximum of N images are reduced and laid out into one image.
When the total number of originals is divisible by N,
Start printing the reduced layout N sheets at a time from the last page, and if it is not divisible by N, assuming that the remainder of the whole document bundle divided by N is M, the layout is reduced to M sheets from the last page, and then N sheets An image forming apparatus that prints a reduced layout at a time.