JP2001278536A - Image forming device and displaying method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming device and a displaying method therefor, capable of outputting the image formation of a large amount of pages or copies without interrupting it by making a display of urging the device to release the over-stack of a delivery sheet tray during image formation. SOLUTION: This image forming device delivers recording paper sheets with images from one delivery opening to a plurality of movable trays and stacks the sheets. If the tray delivering the sheets during image formation is in an over-stack condition, delivery is switched to another tray without the image formation being interrupted. At the same time, a message 802 of urging the device to remove the sheets from the tray under the over-stack condition is displayed.

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 capable of discharging recording paper on which an image is formed from one discharge port to a plurality of movable trays and stacking the sheets, and a display method therefor.

[0002]

2. Description of the Related Art Conventionally, image data read from a scanner or image data obtained by expanding PDL data sent from a host computer via a network into a bit map is temporarily stored in a memory such as a hard disk in a copying machine. 2. Description of the Related Art A digital copying machine having a function of repeatedly reading out image data of an arbitrary document from a memory and printing out the image data is known.

Further, by providing a memory such as a large-capacity hard disk as an image buffer, the scanner unit and the printer unit can be separated, and the printer unit is warming up or another job is being output. Even in such a case, a reserved copy function that can accept the next copy job as long as the scanner unit is empty is known. With this function, even if a large number of copy jobs occupy the copier, the next copy job can be accepted as long as the image input from the scanner to the memory has been completed, and the throughput of the copy function can be increased. Can be.

In such a high-speed multifunction machine assuming a large number of copies, instead of a conventional multi-bin sorter, a model in which a small number of trays of about 2 to 3 are mounted and a finisher for stacking a large number of jobs of the same tray is mounted. Has increased.
Some of these finishers have a function of switching output to another tray when one tray stacks thousands of sheets and the stack is over.

[0005]

However, even if a certain tray is stuck over, if there is a tray that is not stuck over, printing can be continued as it is, but in any case, that tray also becomes stuck over. However, there is a problem that the job is stopped.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the related art, and has as its object to provide a display for prompting an operation for canceling a discharge tray stackover during image formation. An object of the present invention is to provide an image forming apparatus capable of outputting a large number of pages and a large number of copies without stopping the image formation on the way, and a display method thereof.

[0007]

In order to achieve the above object, the present invention provides an image forming apparatus capable of discharging recording paper on which an image has been formed from one discharge port to a plurality of movable trays and stacking the sheets. A discharge switching unit that switches the discharge to another tray without stopping the image formation when the tray that discharges the recording paper becomes stack-over during image formation; and the discharge switching unit. Display means for displaying a message prompting the user to remove the recording paper from the stack-over tray when switching the paper discharge tray.

According to another aspect of the present invention, there is provided a display method for an image forming apparatus capable of discharging a recording sheet on which an image is formed from one discharge port to a plurality of movable trays and stacking the sheets. A discharge switching step of switching the discharge to another tray without stopping the image formation when the tray from which the recording paper is discharged becomes stack-over during image formation; and A display step of displaying a message prompting removal of the recording paper from the stack-over tray when switching the paper tray.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the image forming apparatus according to the present embodiment. In FIG. 1, reference numeral 101 denotes a digital copier main body, and an operation unit 102 and a reader unit 1
03, a printer unit 104. Operation unit 102
Denotes a digital copying machine main unit 101 and an image input / output control unit 10
Used to operate 5. The reader unit 103 reads an image of a document, and outputs image data corresponding to the document image to the printer unit 104 or the image input / output control unit 105. The printer unit 104 records an image corresponding to image data from the reader unit 103 or the image input / output control unit 105 on recording paper.

The image input / output control unit 105 is connected to the reader unit 103 of the digital copier main body 101 and includes a computer interface unit 106, an image memory 107, a control unit 108, and a backup RAM 110. The computer interface unit 106 includes a print server 109 including a personal computer or a workstation (PC / WS) and a control unit 108.
The control unit 1 converts code data (PDL) representing an image transferred from the PC / WS 109 into image data recordable by the printer unit 104,
Hand over to 08.

Although the details of the control unit 108 will be described later, the control unit 108 controls the flow of data between the reader unit 103, the computer interface unit 106, and the image memory 107, respectively. Backup R
The AM 110 is a memory that is not erased even when the power is turned off, and stores important data that must be backed up in the digital copying machine main unit 101 and the image input / output control unit 105.

FIG. 2 is a cross-sectional view of the copying machine main body equipped with a finisher. The document feeder 201 feeds a document one by one onto the platen glass 202 in the order of the head, and discharges the document on the platen glass 202 after the reading operation of the document is completed. When the original is conveyed onto the platen glass 202, the lamp 203 is turned on, and the movement of the scanner unit 204 is started to expose and scan the original. The reflected light from the original at this time is reflected by mirrors 205 and 20.
The light is guided to a CCD image sensor (hereinafter, referred to as a CCD) 209 by 6, 207 and a lens 208. Thus, the scanned image of the document is read by the CCD 209.

The laser driver 221 includes the laser emitting section 21
The laser light emitting unit 210 emits laser light corresponding to output image data. This laser beam is irradiated onto the photosensitive drum 211, and the photosensitive drum 211
Is formed with a latent image corresponding to the laser beam. A developer is attached to a portion of the latent image on the photosensitive drum 211 by a developing device 212. In the case of a color machine, developing units for four colors of yellow, magenta, cyan, and black are mounted. The recording paper is fed from one of the cassettes 213 and 214 and the manual paper feed stage 227 at a timing synchronized with the start of the irradiation of the laser beam, is conveyed to the transfer unit 215, and has the developer adhered to the photosensitive drum 211. Is transferred to recording paper. The recording paper with the developer is conveyed to the fixing unit 216,
The developer is fixed on the recording paper by the heat and pressure of the fixing unit 216. The recording paper that has passed through the fixing unit 216 is
7 discharged.

If double-sided recording is set,
After the recording paper is conveyed to the discharge roller 217, the rotation direction of the discharge roller 217 is reversed, and the flapper 218 is rotated.
To the re-feeding conveyance path 219. Refeeding conveyance path 21
9 is transferred to the transfer unit 215 at the timing described above.
Is fed to

Further, when the Z-folding unit 226 is provided in the main body, the recording paper is conveyed to the Z-folding unit, and the Z-folding is performed according to the operation from the operation unit. When the finisher 220 is provided, the discharged recording papers are bundled to sort the recording papers, or the recording paper is punched by the puncher 223 and stapled by the stapler 224 according to a user's specification. . Further, when the saddle stitcher 225 is used, the recording paper is bound by stitching the center of the recording paper and folding the center. The inserter 222 can feed pre-printed recording paper as a cover or a slip sheet, and can transport the recording paper without damaging it because it does not pass through the recording paper path of the printer unit. Jobs that do not use the saddle stitcher 225 pass through the paper exit 231 and
28 and 229. Movable tray 22
8, 229 can both move up and down, and when outputting to the movable tray 228, the movable tray 228 descends to the position of the paper discharge port 231. Saddle Stitcher 225
Is passed through the paper discharge port 232 and the binding tray 2
It is discharged to 30.

FIG. 3 is a diagram showing a key arrangement of the operation unit 102 of the digital copier main body 101. In FIG.
Reference numeral 01 denotes a power switch.
To control the energization of A preheating key 302 is used to turn on / off a preheating mode. A copy A mode key 303 is used to select a copy A mode from a plurality of functions. A copy B mode key 304 is used to select a copy B mode from a plurality of functions. The copy A and the copy B have the same copy function, but if the reading of one copy has been completed by the scanner, the next copy can be input. ing.

A mailbox key 305 is used to select a mailbox function mode from a plurality of functions. Note that the mailbox function is a function that has a storage area in a memory within a copying machine for each user or department, stores a PDL or a scanned image in the storage area, and outputs it when desired. Reference numeral 306 denotes an extension key, and PDL
Used when performing operations on. Reference numerals 303 to 306 are also used when calling each function screen of the LCD 316 described later, and the status of each job can be seen by the display of the LCD 316. A copy start key 307 is used to instruct the start of copying. A stop key 308 is used to interrupt or stop copying.

A reset key 309 operates as a key for returning to the standard mode during standby. 31
Reference numeral 0 denotes a guide key, which is used when it is necessary to know each function. 311 is a user mode key,
Used when the user changes the basic system settings. Reference numeral 312 denotes an interrupt key, which is used when copying is desired to be interrupted during copying. Numeral 313 is a numeric keypad used for inputting numerical values. A clear key 314 is used to clear the input numerical value. An ID key 315 is used to shift to an ID input mode when using a copying machine. An LCD 316 is a combination of a liquid crystal screen and a touch sensor.
The touch panel is a touch panel on which individual setting screens are displayed for each mode, and various detailed settings can be made by touching drawn keys. It also displays the operation status of each job. Reference numeral 317 denotes a tally lamp indicating the communication state of the network, which is normally green, blinks green when communication is being performed, and turns red when a network error occurs.

FIG. 4 is a view showing a copy standard screen of the LCD touch panel 316 according to the present embodiment. Note that, in the present embodiment, when the power is turned on, it is started on a copy standard screen as a default. In FIG.
Reference numeral 1 denotes a message line, which displays the status of the copy job as a message. Reference numeral 402 denotes a magnification display, which displays a set magnification or a magnification automatically determined by a copy mode in percentage. Reference numeral 403 denotes a paper size display, which displays the selected output paper, and displays a message of automatic paper when automatic paper selection is set. Reference numeral 404 denotes a number display, which indicates how many copies are to be made.

Reference numeral 405 denotes a reduction key, which is used when a reduction copy is desired. Reference numeral 406 denotes an equal-size key, which is used when it is desired to return to the same size when reduction or enlargement is set. An enlargement key 407 is used when an enlargement copy is desired. Reference numeral 408 denotes a zoom key, which is used when performing a reduced copy or an enlarged copy by setting a magnification in fine units. A paper selection key 409 is used to specify an output paper. A finisher key 410 is used to set a sort or staple mode. A double-sided key 411 is used to set a double-sided mode.

Reference numeral 412 denotes a density display, which indicates the current density. The left side indicates that the density is low, and the right side indicates that the density is high. Also, the density display 412 is a thin key 4
The display changes in conjunction with the key 13 415. 41
Reference numeral 3 denotes a thin key, which is used to reduce the density. An automatic key 414 is used when a mode for automatically determining the density is used. A body key 415 is used to increase the density. A character key 416 is used to set a character mode for automatically setting a density suitable for copying a character document.
A character / photo key 417 is used to set a character / photo mode for automatically setting a density suitable for copying a document containing a mixture of photographs.

Reference numeral 418 denotes an application mode key which is used to set various copy modes which cannot be set on the copy standard screen. Reference numeral 419 denotes a print status key, which is used when the user wants to know the status of the print currently being performed on the main body 101. The print status key 419 is always displayed at this position, not only on the copy standard screen, and the print status can be viewed at any time by pressing this key. Although not shown in this figure,
An area 420 is a status line for displaying a low-priority alarm that does not need to be displayed on the message line 401, a message indicating the execution state of another function, and the like.

FIG. 5 is a diagram showing the movement of the tray of the finisher in this embodiment. The positions of the movable trays 228 and 229 shown in FIG. 2 are the home positions of the tray when no paper is loaded on the tray. The movable trays 228 and 229 can move up and down, and can receive the sheet discharged from the sheet discharge port 231 of both trays. Further, when one of the trays is over-stacked, it is possible to automatically switch the discharge to the other tray.

FIG. 5A shows a case where the movable tray 229 is over-stacked.
Is lowered, and the movable tray 228 is lowered below the paper discharge port 231 to receive the output sheet from the paper discharge port 231. FIG. 5B shows a case where the movable tray 228 is over-stacked. The movable tray 228 is raised, and the movable tray 229 receives the output sheet from the sheet discharge port 231. In addition, when the sheets are removed from the stack-over tray in each of the states (a) and (b) shown in FIG. 5, the output is continued to the tray currently being discharged as it is during the job operation. Return the tray to the home position after finishing. If the job is a large number of pages, by removing the paper from the stack over tray, even if the currently ejected tray becomes stack over, the tray can be switched further to continue the operation. .

FIG. 6 is a view showing a state in which both trays of the finisher in this embodiment are over-stacked. If output is further continued when one of the movable trays 228 and 229 is in a stackover state, a double tray stackover shown in FIG. 6 will occur eventually, and the job being output at that time will be stopped by a tray stackover alarm. . At this time, the output cannot be continued unless the paper is removed from one of the trays.

FIG. 7 is a diagram showing a display when a copy job is stopped due to tray stack over. As shown in FIG. 6, when the copy job cannot be operated due to the stack over of both trays, the copy A and copy B screens of the LCD touch panel 316 shown in FIG. Is displayed, the user can move the movable trays 228 and 229.
Copying cannot be continued unless one of the sheets is removed.

FIG. 8 is a diagram showing a display in which one movable tray is stacking over and copying is in operation. In the present embodiment, the movable tray 22 is used during copying and printing.
If either one of 8, 229 becomes a stackover, it is possible to output to the other tray, so that copying and printing can be continued.

Therefore, "Copying." Is displayed on the upper message line of the LCD touch panel 316, as indicated by 801. However, if the sheets are not removed from the stackable movable tray, both trays will eventually be stacked and the job will be stopped. Displays a message to remove paper from the empty tray.

The example shown in FIG. 8 is a display example of the state shown in FIG. 5A when the movable tray 229 is over-stacked. Please remove the paper. "Is displayed to urge the user to perform an operation to cancel the tray stack over. Further, in the case of the present embodiment, the movable tray 228 is referred to as a discharge tray B, and the movable tray 229 is referred to as a discharge tray A.

FIG. 9 is a diagram showing a display when a mailbox job is stopped due to tray stack over.
As shown in FIG. 6, when both trays are stacked and the mailbox job cannot be operated,
A mailbox screen is displayed on the touch panel 316,
As shown in the upper message line 901, "Please remove paper from output tray" is displayed. Unless the user removes paper from either movable tray 228 or 229, mailbox printing can be continued. Can not.

In FIG. 9, reference numeral 902 denotes a box key. By pressing this key, the screen is switched to a job list display in each box. A box name area 903 allows the user to freely define the name of each box. Reference numeral 904 denotes a memory usage amount display;
It shows what percentage of the total memory capacity the documents inside each box occupy. Reference numeral 905 denotes a box list page display in which the denominator is the number of screens and the numerator is the current screen page. Reference numerals 906 and 907 denote a down scroll key and an up scroll key, respectively, which are used when switching pages of the box list screen.

FIG. 10 is a view showing a display in which one of the movable trays is being stacked and the mailbox job is being printed. Movable tray 2 when printing mailbox
If either one of the stacks 28 and 229 becomes a stackover, a mailbox screen is displayed on the LCD touch panel 316, and the upper message line indicates "Printing." The status is displayed, and a message is displayed on the lower status line 420 to remove the paper from the stack over tray. The example shown in FIG. 10 is a case where the movable tray 229 has a stack over.
FIG. 5A is a display example of the state shown in FIG. 5A, in which a message "Please remove the paper from the paper discharge tray B."

FIG. 11 shows a PD with tray stack over.
FIG. 14 is a diagram illustrating a display when an L print job has stopped. As shown in FIG.
If the DL print job can no longer operate, L
The extended screen is displayed on the CD touch panel 316, and the message "Please remove the paper from the paper output tray." Is displayed on the upper message line as shown by 1101, and the user does not remove the paper from one of the movable trays 228 and 229. As long as PDL printing cannot be continued.

In FIG. 11, reference numeral 1102 denotes a key indicating an extended function provided, and the extended function can be switched by pressing this key. Actually, LIP
S and PS / PCL. An operation mode key 1103 causes a transition to a screen for setting an emulation mode or the like by depressing this key when offline. Reference numeral 1104 denotes a priority emulation key. When the user is offline, the user can call a priority emulation setting screen by pressing this key. Note that it is also possible to set a priority emulation that switches preferentially when the printer cannot identify a local command. Reference numeral 1105 denotes a utility key. By pressing this key when offline, a screen for performing utilities such as status print, job log print, test print, and font print can be called. Reference numeral 1106 denotes a setup key. By pressing this key when offline, a setup menu screen for setting a print position, an interface, and the like can be called. Reference numeral 1107 denotes a paper feed selection screen. By pressing this key when the printer is offline, the paper feed stage screen can be called, and the paper feed stage can be set. 1
Reference numeral 108 denotes a discharge key, which can be used to cancel a job by pressing this key when the printer is offline.
Reference numeral 1109 denotes a double-sided key. When the user is offline, pressing this key calls up a double-sided setting screen and sets double-sided printing. A reset key 1109 can reset the PDL board by depressing this key when offline. Reference numeral 1110 denotes an online key. Pressing this key puts the PDL board in an online state and waits for reception of a PDL print job. Reference numeral 1111 denotes an offline key. When this key is pressed, the PDL board goes offline,
Operations such as various settings for the DL board can be performed.

FIG. 12 is a view showing a display when one of the movable trays is being stacked and a PDL print job is being printed. Movable tray 228, 2 during PDL printing
If one of the two has become a stack over, an extended screen is displayed on the LCD touch panel 316,
The upper message line displays the mailbox job execution status such as “Printing” as indicated by 1201, and the lower status line 420 displays a message for removing paper from the stack over tray.

The example shown in FIG.
Is a display example of the state of (a) shown in FIG. 5 in a case where stacking has occurred, and a message "Please remove the paper from the paper discharge tray B." Prompt operation to release stackover.

FIG. 13 is a flow chart showing a process at the time of tray stack over of the image forming apparatus according to the present embodiment. This process is a process of detecting a tray stack over and displaying a stack over message on each screen described above.

First, in step S1301, one of the movable trays 228 and 229 is detected as a stack over. In step S1302, it is determined whether the screen currently displayed on the LCD touch panel 316 is the copy A screen. . If the screen is the copy A screen, the process advances to step S1303 to determine whether or not the copy A is being executed. If the copy A is not being executed, the process ends. If the copy A is being executed, the process proceeds to step S1304. It is determined whether or not both trays are stacked. If both trays are stack-over, step S1305
Then, a message for removing the paper from the paper output tray is displayed on the upper message line of the copy A screen. on the other hand,
If both trays are not stack-over, step S1
Proceeding to 306, a message is displayed on the lower status line of the copy A screen to remove the paper from the stacking paper discharge tray.

If it is determined in step S1302 that the screen is not the copy A screen, the flow advances to step S1307 to determine whether the screen currently displayed on the LCD touch panel 316 is the copy B screen. If the screen is the copy B screen, the process advances to step S1308 to determine whether or not the copy B is being executed. If the copy B is not being executed, the process ends. If the copy B is being executed, the process proceeds to step S1309. It is determined whether or not both trays are stacked.
If both trays are stack-over, the flow advances to step S1310 to display a message for removing the paper from the discharge tray on the upper message line of the copy B screen. On the other hand, if both trays are not stack-over, the flow advances to step S1311 to display a message on the lower status line of the copy B screen to remove sheets from the stack-over discharge tray.

If it is determined in step S1307 that the screen is not the copy B screen, the flow advances to step S1312 to determine whether the screen currently displayed on the LCD touch panel 316 is the mailbox screen. If it is a mailbox screen, the process advances to step S1313 to determine whether a mailbox job is being executed. If the mailbox job is not being executed, the process ends.
If the tray is being executed, the flow advances to step S1314 to determine whether or not both trays are overstacked. If both trays are stacked, the process advances to step S1315 to display a message for removing the paper from the paper discharge tray on the upper message line of the mailbox screen. On the other hand, if both trays are not stack-over, the flow advances to step S1316 to display a message for removing sheets from the stack-over paper discharge tray on the lower status line of the mailbox screen.

In step S1312, if it is not the mailbox screen, that is, if it is the extended screen, the flow advances to step S1317 to determine whether or not PDL printing is being executed. If the PDL print is not being executed, the process is terminated as it is. If the PDL print is being executed, the process proceeds to step S1318, and it is determined whether or not both trays are stack-over. A message to remove the paper from the output tray is displayed on the message line on the extended screen. On the other hand, if both trays are not stack-over, the process proceeds to step S1320, and a message is displayed on the lower status line of the extended screen to remove sheets from the stack-over discharge tray.

According to the present embodiment, the display prompting the user to release the output tray stackover during the operation of the job is displayed, so that copying and printing of a large number of pages and a large number of copies are not stopped halfway. And a copying machine capable of outputting to the printer.

The present invention can be applied to a system including a plurality of devices (for example, a host computer, an interface device, a reader, a printer, etc.), but can be applied to a single device (for example, a copier, a facsimile). Device).

An object of the present invention is to provide a storage medium storing a program code of software for realizing the functions of the above-described embodiments to a system or an apparatus, and to provide a computer (CPU or MP) of the system or apparatus.
It goes without saying that U) can also be achieved by reading and executing the program code stored in the storage medium.

In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiment, and the storage medium storing the program code constitutes the present invention.

As a storage medium for supplying the program code, for example, a floppy disk, hard disk, optical disk, magneto-optical disk, CD-ROM, CD
-R, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used.

When the computer executes the readout program code, not only the functions of the above-described embodiment are realized, but also an OS (Operating System) running on the computer based on the instruction of the program code. ) May perform some or all of the actual processing, and the processing may realize the functions of the above-described embodiments.

Further, after the program code read from the storage medium is written into a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, based on the instruction of the program code, It goes without saying that the CPU included in the function expansion board or the function expansion unit performs part or all of the actual processing, and the functions of the above-described embodiments are realized by the processing.

[0050]

As described above, according to the present invention,
By performing a display urging an operation to release the discharge tray stackover during image formation, it is possible to output a large number of pages and a large number of copies without stopping the image formation on the way.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an image forming apparatus according to an embodiment.

FIG. 2 is a cross-sectional view of the copying machine main body on which a finisher is mounted.

FIG. 3 is a diagram illustrating a key arrangement of an operation unit of the digital copying machine main body.

FIG. 4 is a view showing a copy standard screen of the LCD touch panel 316 according to the embodiment.

FIG. 5 is a diagram illustrating the movement of the tray of the finisher according to the embodiment.

FIG. 6 is a diagram illustrating a state in which both trays of the finisher according to the present embodiment are stacked.

FIG. 7 is a diagram illustrating a display when a copy job is stopped due to a tray stackover according to the present embodiment.

FIG. 8 is a diagram showing a display in which one movable tray according to the embodiment is stacking over and copying is in operation.

FIG. 9 is a diagram illustrating a display when a mailbox job is stopped due to tray stackover according to the present embodiment.

FIG. 10 is a diagram illustrating a display in which a mailbox job is being printed when one movable tray according to the present embodiment is overstacked.

FIG. 11 is a diagram illustrating a display when a PDL print job is stopped due to a tray stack over according to the present embodiment.

FIG. 12 is a diagram illustrating a display during printing of a PDL print job when one of the movable trays is stacked over according to the present embodiment.

FIG. 13 is a flowchart illustrating processing when the tray stacks over in the image forming apparatus according to the present embodiment.

Continued on front page F-term (reference) 2H027 DA41 DC08 DC09 EC10 EC20 ED22 EE07 EF09 FA23 FA24 GA43 GA45 GA47 GB01 GB09 ZA08 3F048 AA02 AA04 AB01 BA04 BB02 BC01 BC03 BC09 BD01 DA09 DC12 EA03 EA12 EB40 3F05 EA07 EA02 EB04 HH23 HZ34 JJ35 KK42 LZ05

Claims (7)

[Claims] 1. An image forming apparatus capable of discharging recording paper on which an image is formed from one discharge port to a plurality of movable trays and stacking the recording paper, wherein the recording paper is discharged during image formation. A discharge switching unit that switches discharge to another tray without stopping the image formation when the tray is over-stacked; and when the discharge switching unit switches the discharge tray,
Display means for displaying a message urging removal of the recording paper from the tray in which the stack is over. 2. The image forming apparatus according to claim 1, further comprising a plurality of image forming screens, wherein the display unit displays a message indicating that one tray is in a stack over state on the screen during image forming. Image forming device. 3. The image forming apparatus according to claim 2, wherein the message is displayed at a different display position when the one tray is stacked and when all trays are stacked. 4. A display method for an image forming apparatus, wherein a recording sheet on which an image is formed can be discharged from one discharge port to a plurality of movable trays and stacked, wherein the recording sheet is discharged during image formation. A discharge switching step of switching the discharge to another tray without stopping the image formation when the tray that is performing the stackover is performed, and when switching the discharge tray in the discharge switching step,
A display step of displaying a message prompting removal of the recording paper from the tray in which the stack has been over. 5. The image forming apparatus according to claim 4, further comprising a plurality of image forming screens, wherein the displaying step displays a message indicating that one tray is in a stack over state on the screen during image forming. A display method of the image forming apparatus. 6. The display of the image forming apparatus according to claim 5, wherein the message is displayed at a different display position when the one tray is over the stack and when all the trays are over the stack. Method. 7. A computer-readable storage medium storing a program code of a display method in an image forming apparatus capable of discharging a recording sheet on which an image is formed from one discharge port to a plurality of movable trays and stacking the recording paper. A code for a discharge switching step for switching the discharge to another tray without stopping the image formation when the tray from which the recording paper is discharged becomes stack-over during image formation; A display step of displaying a message prompting the user to remove the recording paper from the stack-over tray when switching the tray.