JPH03184063A - Image forming device with covering and folding function - Google Patents

Abstract

PURPOSE:To eliminate a wasteful operation time and to attain covering with required minimum sheets by providing a holding function selecting means and a front cover sheet selecting means for selecting a front cover sheet of a size corresponding to an original size or the half. CONSTITUTION:An operator can select a covering function or the folding function by using a function selecting means such as keys on an operation panel 61, and also whether or not an image is formed on a front cover sheet. When the operation is started while a rear covering function and the folding function are selected, a rear cover sheet of a size corresponding to its original size or the half is selected and ejected. In a mode where a front covering function and the folding function is selected and an image is formed on the front cover sheet, the front cover sheet of a size corresponding to its original size is selected and the image is formed on this front sheet, which is folding-processed and ejected afterward. Thus, the waste of covering sheet is eliminated and the operation time can be shortened.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention has a covering function that allows a cover sheet to be ejected between regular sheets ejected to a paper ejecting section, and a covering function that allows the ejected sheets to be adjusted to a predetermined size. The present invention relates to a covering ring having a folding function and an image forming apparatus with a folding function.

[Conventional technology]

2. Description of the Related Art Some conventional copying machines are known to have a covering function.

This copying machine with a covering function is capable of feeding cover paper of a different color or size from normal paper every predetermined number of sheets specified in advance by keys on the operation panel. This makes it possible to provide cover sheets on the back and front sides of a series of copy sheets.

On the other hand, in conventional copying machines, a vapor folding unit (vapor fold unit) is installed on the ejection side of the copying machine body, and paper ejected from the copying machine body is subjected to interdigitation processing such as folding in half or Z-folding. (There are also models that allow paper to be ejected to an ejection tray.

[Problem to be solved by the invention]

In a copying machine having a covering function and a folding function as described in 011, when copying an A3 size original, for example, if you select the folding mode and the covering mode as the operation mode, it will be possible to perform the same operation as the original I-Nize. A
Three sizes of cover paper are selected, and the cover paper is also folded in half, for example, and then discharged in the same way as regular paper.

However, when covering, the back cover paper is usually not copied. Therefore, in the above example, it is not necessary to select A3 size cover paper as the back cover paper, but it is sufficient to select A4 size cover paper. Also, for the front cover paper, if copy processing is to be performed, it is necessary to select A3 size cover paper, but if copy processing is not to be performed, A4 size cover paper should be selected in the same way as for the back cover described above. Just choose. In particular, when Z-folding is selected as the folding mode, there is a problem in that even the cover sheet is Z-folded.

In this way, conventional devices always use cover paper of the same size as the original, without distinguishing between front cover paper and back cover paper, and without distinguishing between copying and non-copying of front cover paper. Selecting, folding, and discharging the paper wastes paper and wastes operating time, which is a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide an image forming apparatus with a covering and folding function that eliminates wasted operation time and can perform covering using the minimum necessary amount of paper.

[Means to solve the problem]

The image forming apparatus with a covering and folding function according to the present invention has a covering function that allows a cover sheet to be ejected between regular sheets that are ejected to an ejecting section, and a folding function that allows the ejected sheet to be folded into a predetermined size. It has

The document size detection means for detecting the size of the document, a covering function selection means, a folding function selection means, a back cover sheet selection means, an image formation selection means, and a front cover sheet selection means are provided. There is ζ.

The covering function selection means is for selecting a covering function for each of the front cover and the back cover, and the folding function selection means is for selecting a folding function. When the back covering function and the folding function are selected by each of the selection means, the back cover sheet selection means selects a size corresponding to the original size or a half size thereof according to the detection result of the original size detection means. The back cover sheet is selected. The image formation selection means is for selecting whether or not to form an image on the front cover sheet. The front cover sheet selection means selects the document size according to whether or not an image is formed on the front cover sheet and the detection result of the document size detection means when the front covering function and the folding function are selected by each of the selection means. A front cover sheet of the size corresponding to or half the size is selected.

[Effect]

In this invention, the operator can select the covering function and the folding function using function selection means such as keys on the operation panel, and can also select whether or not to form an image on the front cover sheet. can.

When the operation is started with the back covering function and the folding function selected, a back cover sheet of the size corresponding to the original size or half the size of the original is selected and discharged according to the original size.

As a result, for example, if the document is A3 size, an A4 size cover sheet is selected as the back cover sheet. Further, in the case of A4 size, an A4 size cover sheet is selected. Therefore, it is possible to eliminate waste of cover sheets, and the operating time is shortened.

Additionally, in a mode where the front covering function and folding function are selected and image formation is performed on the front cover sheet, a front cover sheet of a size corresponding to the document size is selected and the image is formed on this front cover sheet. After the folding process is completed, the folded paper is discharged.

On the other hand, the front covering function and the folding function are selected, and no image is formed on the front cover sheet 1-; A front cover sheet of half the size is selected and ejected.

As a result, in a mode in which image formation processing is performed on a front cover sheet, for example, if the document is A3 size, an A3 size cover sheet is selected as the front cover sheet, and if the document is A4 size, an A4 size cover sheet is selected. selected. On the other hand, in a mode that does not perform image formation processing,
For example, if the document is A3 or A4 size, an A4 size front cover sheet is selected. Therefore, similarly to the back covering mode, it is possible to eliminate waste of cover sheets, and the operating time is shortened.

〔Example〕

FIG. 1 is a schematic cross-sectional configuration diagram of a copying machine according to an embodiment of the present invention.

In FIG. 1, an automatic document feeder (hereinafter referred to as DF) 11, which also serves as a document holder, is provided at the top of a copying machine 10. On the right side of the copying machine IO, a bypass paper feed section 12 and paper feed cassette cases 13 and 14 are arranged in order from the top. Further below, a large paper feed cassette case 16 is arranged. In addition, in the case of this example,
Bypass paper feed section 12 and upper paper feed cassette case 13
Cover papers of different sizes are stored in each. The bypass paper feed section 12 is provided with a sensor (not shown) for detecting the size of the 112iIt cover paper. On the left side of the copying machine IO, there are a paper hold unit l-1 and a staple unit 2.
is installed. Each of these units 1.2 will be described later.

A photosensitive drum 17 is arranged approximately at the center inside the copying machine 10 . Around the photosensitive drum 17, a charging device 18, a developing device 19, a transfer device 20, and a paper separating device 21 are installed.
and cleaning device 22 are arranged in this order. Furthermore, an exposure device 23 is arranged in the upper space of the copying machine 10. Furthermore, the bypass paper feed section 12 etc. and the transfer device 20
A paper feed conveyance path 24 is provided between the two. A paper discharge transport device 25 and a fixing device 26 are disposed in this order on the downstream side of the transfer device 20 in the paper transport direction. A branch 2 is provided between the fixing device 26 and the paper holding unit l.
7 is disposed, and the reversing device 28 is disposed above the branch 27. The 0 branch 27 is in a first posture (the illustrated posture) in which the fixing device 26 is communicated with the paper holding unit 1 side.
It is possible to switch between the position and the position communicating with the reversing device 2. In addition, the branch 27 and the discharge roller 29
A discharge switch 52 for detecting that paper has been discharged is provided between the paper and the paper.

An intermediate tray 30 is arranged in the lower space of the copying machine 10. A paper conveyance path 31 is arranged between the left end of the intermediate tray 30 and the branch 27. Intermediate tray 3
A paper conveyance path 32 is arranged between the right end portion of 0 and the paper feed conveyance path 24 . The intermediate tray 30 includes a paper tray 33 on which paper is placed, a paper feed roller 34 located at the right end of the paper tray 33, and a feed roller 35 located at the center of the paper tray 33. are doing. A presser roller 36 is arranged above the feed roller 35 to press the paper placed on the paper table 33 from above.

The DFII has a document placement section 41 on which a document is placed at the center of the device. A feeding roller 42 for feeding the original is provided at the right end of the original placing unit 41. As shown in FIG.

Further, a paper feed roller 44 and a paper feed path 45 continuous with the paper feed roller 44 are provided at the right end of the housing 43 that extends over the DFII (!4J). A conveyance belt 46 is disposed continuous with the paper feed path 45 and facing the contact glass 47.Furthermore, at the left end of the housing 43, the conveyance belt 46 is connected to a document R placing section 41 serving as a document discharge section. A document ejection path 48 is provided for ejecting the document.Furthermore, a document reversal path 48 is arranged between the downstream end of the conveyor belt 46 and the downstream end of the document ejection path 48. As a result, when a double-sided original is used, the original can be reversed and fed onto the contact glass 47 again.

#iir A sensor 51 for detecting the presence or absence of a document is provided at the right end of the document placement unit 1, and a sensor 51 for detecting the document size is provided in the middle of the paper feed path 45. A sensor 53 is arranged.

The paper hold unit 1 is a unit capable of folding a copied sheet in half or Z-folding, and includes mechanisms such as a folding/non-folding switching lever 3 and a folding roller 4.

The stapling unit 2 is a unit for performing a stapling function, and this unit can staple copied sheets. The stapling unit 2 includes a stable/stangly J switching lever 5 for switching between binding or simply ejecting sheets to be ejected, a staple storage mechanism 6, a staple drop lever 7, a staple tray 8, and a stacker tray. 9th class is equipped.

As shown in Figure 2, this copying machine has a CPU, RAM,
It has a main body control section 60 consisting of a microcomputer equipped with a ROM and the like. The main body control section 60 includes an operation panel 61 disposed on the upper end surface of the copying machine, a paper size detection sensor 63 for detecting the paper size of the bypass paper feed section 12 and the size of each paper feed cassette, and a paper size detection sensor 63 shown in FIG. The discharge switch 52 and other input sections are connected.

The main body control section 60 also includes a paper feed drive section 64 that drives paper feed rollers and the like, an image forming section drive section 65 that includes an optical system drive section, etc. The hold unit 1 and staple unit 2 are connected to other output sections.

The DFII also includes a CPU, similar to the main body control section 60.
, RAM, ROM, and the like.

The DF control section 66 and the main body control section 60 are connected,
The DF control unit 66 includes a document presence/absence detection switch 51 and a document size detection sensor 53 shown in FIG. The parts are connected.

Next, the operation will be explained according to the flowcharts shown in FIGS. 3A to 3E.

When the main switch of the copying machine is turned on, initial settings such as setting the number of copies to one are performed in step S1 of FIG. 3A. Note that in this initial setting, APS
The mode is set and each paper size data is read. The APS mode is a mode in which paper is automatically selected.

Next, in steps S2 to S7, it is determined which key on the operation panel has been pressed.

Mode setting keys for setting various operation modes are arranged on the operation panel.

For example, if a key for executing the covering function is pressed, the process moves from step S3 to step S8. In steps 88 to S19, processing for setting various covering modes is performed.

That is, in step S8, it is determined whether the flag CF exceeds "4". This flag CF is used to determine which covering mode is to be set. If the CF exceeds "4", the process moves to step S9, and this CF is set to "0". Furthermore, if CF is "4" or less, the process moves to step 310 and the value of CF is incremented. Next, step S
In step 314, the value of CF is determined.

If CF is "1", the process moves to step S15, and the operation mode is set to FC+BN mode (described later). Also,
If the CF is "2", the process moves to step S16 and the FC
mode, and if CF is "3", step S1
7 and set to FN+BN mode, CF is "4"
If CF is "0", proceed to step S18 and set to I''N mode.
19, the covering mode is turned off. It should be noted that each mode has the following contents.

F Cl-B N: There is cover paper on both the front and back sides, and copy processing is performed on the front cover paper.

Copy processing is performed on front cover paper without FCC back cover paper or back cover paper.

FN and BN: There is cover paper on both the front and back sides, and copy processing is not performed on either side.

FN: Front cover paper is present, back cover paper is not present, and copy processing is not performed on the front cover paper.

In this way, by pressing the key for selecting the covering mode several times, you can select various (four types in this case) as the covering mode or cancel (turn off) the covering mode. be able to.

If the key for executing the folding mode function is pressed, the process moves from step S4 to step S20.

In step S20, it is determined whether or not the folding mode has already been set. If the folding mode has been set, the folding mode is turned off in step S21, and if the folding mode has not been set, Proceeding to step S22, the folding mode is set.

If the key for executing the stapling function is pressed, the process moves from step S5 to step S23. In step S23, it is determined whether the stapling mode has already been set, and if it has already been set, the process moves to step S24 to turn off the stapling mode, and if it has not been set, the process moves to step 325. Migrate and set stapling mode.

Furthermore, when documents of the same width direction but different length sizes, such as A4 horizontal size and A3 size, are mixed, it is necessary to set the auto selection mode for the DFII. This is a mode in which the size of the original is detected each time the original is supplied. When the key for setting this DF auto selection mode (hereinafter referred to as mixed loading mode) is pressed, the process moves from step S6 to step S26. In step S26, it is determined whether the mixed loading mode has already been set, and if it has been set, the mode is turned off in step S27, and if it has not been set, the mixed loading mode is set in step 32B. .

Further, if a key other than the one described above is pressed, processing corresponding to the pressed key is performed in step S7, and the process returns to step S2.

If the print key is pressed, the process moves from step S2 to step S30 in FIG. 3B. First, step S
DFII manuscript i3 at 30! It is determined whether there is a document in the device 42 or not. This judgment is made by the document presence/absence detection switch 51.
This is done by turning on and off. Here, if no original is placed on the original placing table 42, the process moves to step S31, other processing is performed, and the process returns to step S2. Here, it is assumed that three or more originals are placed. If there is a document on the DFII, the process moves to step S32, and the paper feed roller 44 and conveyance belt 46 are driven to set the document at a predetermined position on the contact glass 47.1.

] 1 WORK"-" Next, in step S33, it is determined whether the mode requires a back cover sheet, that is, the FC+BN mode or the FN+BN mode. If the mode is set to require back cover paper, the process moves to step S34, where the document detection first subroutine is executed and the size of the back cover paper is set. Further, in the case of a mode in which a back cover sheet is not required, that is, FC mode, FN mode, or non-covering mode, the process moves from step S33 to step S36, and a second document detection subroutine is executed.

The document detection first subroutine in step S34 will be explained using FIG. 3C.

First, in step Nl, document size data is read.

Then, based on this data, settings are made as to which paper cassette the plain paper is to be fed from.

Next, in step N2, it is determined whether or not the APS mode is set, and in step N3, it is determined whether or not the folding mode is set.

In step N4, it is determined whether the mode is FC mode, in step N5 it is determined whether the mode is FN+BN mode or FN7-mode, and in step N6 it is determined whether the mode is FCBN mode. Further, in step N7, it is determined whether or not it is the final document, and in step N8, it is determined whether or not it is the mixed loading mode.

Assume that the covering and folding functions are set in the APS mode, and that the size setting operation is for a cover sheet. In this case, from step N2 to step N
After passing through each step of 8, the process proceeds to step N9. Steps N9 to Nil determine whether the document size data is A3 size or B4 size.
It is determined whether the size is 1×17''. If the document size is A3 size, the process moves to step N12, and half size A4 size is set as size data. Furthermore, in the case of B4 size, the process moves to step N13 and is set to half size, 85 size. Also, 1
If the size is 1×17”, proceed to step N14,
Set it to half size 11 x 8 L/2”.

Then, the process moves to step N15.

Note that in the case of mode setting such that steps N12 to N14 are not passed, the size data read in step Nl is maintained as is.

In step N15, the size data and the bypass paper feed section 1 are
It is determined whether the sizes of the cover sheets set in No. 2 are the same. Further, in step N16, it is determined whether the size data and the cover sheet set in the upper sheet cassette 13 are the same. If there is no cover paper of the same size as the size data in the bypass paper feed section 12 and the upper paper cassette 13, the process moves to step N17. In step N17, cover paper replenishment is displayed on the operation panel, and in step N18, each mode is set to the initial state, and the process returns to step S2.

If the size data is the same size as the cover paper placed on the bypass paper feed section 12, the process moves to step N19, and the cover paper is set so as to be fed from the bypass paper feed section 12. Also, the size data is
If it is the same size as the cover paper stored in the paper feed cassette, the process moves to step N20, and the cover paper is set so that it is fed from the upper stage 13 of the paper feed cassette.

By setting the back cover paper in this document detection first subroutine, when the folding mode is selected, if the document size is long (A3, B4, 11 x 17"), half the size of each size is set. Therefore, it is possible to always select a cover sheet that is half the size of the long size, and it is possible to eliminate paper waste and shorten operation time.

The back cover paper set as described above is fed in step S35 in FIG. 3B, and the process proceeds to step S39 without copying, and is discharged in step 339.

The paper discharge processing subroutine will be explained using FIG. 3E. In step 01, it is determined whether or not paper has been ejected from the copying machine main body. This is determined by the ejection switch 52 shown in FIG. Ejection roller 2 on the main body side
If the paper has been ejected from step 9, the process moves to step 02. In step 02, it is determined whether the folding mode is set. If the folding mode is set, the folding operation is performed in step 03, and the folding operation is performed in step 04.
to eject this paper. In addition, if the folding mode is not set in step 02, step 03
The process proceeds to step O4 and discharge is performed without processing. Please note that the paper that has been ejected is A3. B4,1txt7
” size, the two-folding operation is executed in step 03, but if the ejected paper is half the size, it is ejected as is.

Next, in step S40 of FIG. 3B, it is determined whether one cycle of copy processing has been completed for all documents. This is done by a recycle lever (not shown). If the process is finished, it is determined in step S60 whether or not front non-copy is performed, and if NO, the process moves to step 341. If it is determined YES in step S60,
The process moves to step 34B. In step S41, it is determined whether or not the stapling mode is set, and if it is set, stapling processing is performed in step S42. If the stapling mode is not set, the process moves to step S54 without processing step S42. In step S54, it is determined whether or not the processing for the set number of copies has been completed, and if it has been completed, the process returns to step S2. If the process has not ended, the process returns to step "S32."

1 Blood IJJ Gitan Processing In this example, it is assumed that a large number of documents are set, so after the back cover paper is subjected to the Jingi processing, the process moves from step S40 to step 343. Step S4
In step 3, the next original is fed and set on the contact glass 47. In step S44, the contact glass 4
7. It is determined whether or not the original set on 7 is the R final original.

If it is the final manuscript, the process advances to step 346 and subsequent steps. Here, it is assumed that a large number of originals are placed, so at this point, the process moves from step S44 to step S45. In step 345, it is determined whether the mode is mixed loading mode. If the mixed loading mode is not set, the process moves to step 337, and if the mixed loading mode is set, the process moves to step 336. Step 33
In step 6, a second document detection subroutine as described later is executed. In step S37, plain paper of the size set in step S36 is fed.

Next, in step 33B, a copy process is performed on the fed plain paper, and the process moves to step S39.

After step S39, the same paper ejection process as described above is performed.

Next, the second subroutine for detecting the °C document will be explained according to FIG. 3D. In this subroutine, first, in step M1, document size data is read, and based on the size data, settings are made as to which paper feed cassette the plain paper is to be fed from. Next, in step M2, it is determined whether or not the mode is mixed loading mode, and in step M3, it is determined whether or not the mode is APS mode. If the determination is NO in each case, the process moves to step MIO. Also,
If YES is determined in steps M2 and M3, the process moves to step M4. In step M4, it is determined whether the covering mode is set. If the covering mode is not set, the process moves to step M5 and it is determined whether the stapling mode is set. If neither the covering mode nor the stapling mode is set, the process moves to step MIO.

On the other hand, if either the covering mode or the staple shade ψ is set, the process moves to step M6. In steps M6 to M8, it is determined whether the document size data is A3 size, B4 size, and 11X17', respectively. The original size is A3, B4. If the size is either 1 x 17", the process moves to step M9, where the folding mode is forcibly set, and the process moves to step MIO.
If the original size is not one of the above sizes,
The process moves to step MIO without processing step S9.

In step MIO-M15, cover paper is set in exactly the same manner as in steps N15 to N20 of the first document detection subroutine.

By executing such document detection second subroutine 4, when in mixed loading mode and covering mode or stapling mode is selected, long size (
A3. The folding mode is always set for the paper size (B4.11X17''').

Therefore, even if you do not select folding mode when you select covering mode or stapling mode in mixed loading mode, long size paper is forcibly folded and covered in a uniform size. Can perform ring and staple processing.

Thereafter, the operations from step S36 to step 340 and from step S43 to step S45 are repeated until the final document is set on the contact glass 47.

, -(Bloody front side Z) 2 sets When the final document is set on the contact glass 4'7.1, YES is determined in step S44 and the process moves to step S46. In step S46, it is determined whether front copy mode is set. If the front copy mode is not set, the process returns to step 336 and the same operation as described in 1111 is repeated. Then (, the process moves from step S40 to step 341,
The same operation as described above is performed and the process returns to step S2 or step S32.

If the front copy mode is set, the process moves from step 346 to step S41. Step 3
In step 47, a first document detection subroutine similar to that described in 011 is executed. As a result, the front cover paper is set.

The setting of the front cover paper will be explained using FIG. 3C.

When setting the front cover paper, the mote that performs the copy processing of the front cover paper performs step N4 and step N6. N7
Since the process moves to step N15, the size data read in step N1 is maintained as is. On the other hand, in mode 1 in which copy processing is not performed on front cover paper, the process moves from step N5 to step N9. Then, in the same way as when setting the back cover paper, step N9 to step N
14, rewrite the size data to half the size only in the case of long size (A3.B4, 11X17 paper),
The process moves to step N15. The subsequent processing is the same as that for the salt-covered paper.

By executing the first document detection subroutine like this, the folding mode is selected, and if the mode does not perform copy processing on front cover paper, cover paper of half the long size→'' size is selected. However, when performing 21-page processing, select cover paper of the same size as the original. Therefore, the minimum necessary cover paper is selected, and similarly to the back cover paper, it is possible to eliminate the undefeated cover paper.

Furthermore, the operating time can be shortened.

The front cover paper of the size set in step 347 is
Paper is fed in step 34B. Next, in step S49, it is determined whether or not the mode is for copy processing on front cover paper. If the mode is for copy processing, 21 copy processing is performed in step S50, and the process moves to step S51. If the mode is such that copy processing is not performed on front cover paper, the process moves from step S49 to step 351. In step S51, a paper discharge processing subroutine similar to that described above is executed, and the process moves to step S52.

In step S52, it is determined whether or not the stapling mode is set, and if it is set, step S5
At step 3, stapling processing is performed and the process moves to step 355. Further, if the stapling mode is not set, the process moves from step S52 to step 355. In step S55, it is determined whether or not the processing for the set number of copies has been completed, and if it has not been completed, the process returns to step 332 and the above-described processing is repeatedly executed. Once the set number of copies has been processed, the process returns to step S2.

Note that when covering mode is not selected,
After steps 532 and S33 in FIG. 3B, steps 336 to S45 are repeatedly executed, and when the copying process for the set number of copies is completed, the process returns from step S54 to step S2 and waits for the next process.

[Other Examples]

(a) In the above embodiment, the case where the copy magnification is 100% has been described, but if the copy magnification is other than 100%, step Nl in FIGS. 3C and 3D.

The size data read by Ml may be changed in accordance with the magnification ratio, and thereafter the size may be halved as appropriate by the same process.

0)) In the above embodiment, as the automatic document feeder Fff,
Although the description has been made regarding the document circulation system, the present invention can be similarly applied to systems other than this.

(C) In the above embodiments, the present invention is applied to a copying machine that does not have a sorting function, but the present invention can be similarly applied to a copying machine that has a sorting function.

[Effects of the Invention] As shown in L: below, in the present invention, when the covering and folding functions are selected, when back cover paper is required, paper half the size of the long size is always selected, and the front By not forming an image on the cover paper (41), (by selecting a paper of an appropriate size, it is possible to waste the cover paper and reduce the operating time.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical cross-sectional view of a copying machine with a covering and folding function according to an embodiment of the present invention, FIG. 2 is a control block diagram of the same, and FIGS. 3A to 3E are diagrams showing a flowchart of its control 410. . ! ...Paper hold unit, 2...Stapling unit, 51...Document right front detection switch, 53.
・・Document feed/fz detection sensor, 60 ・・Main body control unit,
6I...Operation panel, 63...Paper size detection sensor, 6 fi...D I・' control unit, 67...[)
drive unit.

Claims (1)

[Claims] (1) An image forming device with a covering and folding function, which has a covering function that allows a cover sheet to be ejected between regular sheets that are ejected to the paper ejecting section, and a folding function that folds the ejected sheets into a predetermined size. , a document size detection means for detecting the size of the document; a covering function selection means for selecting the covering function of each of the front cover and the back cover; and a folding function selection means for selecting the folding function. means, when the back covering function and the folding function are selected in each of the selection means, selecting a back cover sheet of a size corresponding to the original size or half the size thereof according to the detection result of the original size detection means; a back cover sheet selection means; an image formation selection means for selecting whether or not to form an image on the front cover sheet; and when a front covering function and a folding function are selected in each of the selection means, the front cover sheet is a front cover sheet selection means for selecting a front cover sheet of a size corresponding to the original size or a half size thereof according to the presence or absence of image formation and the detection result of the original size detection means; Image forming device.