JP2018140847A - Image forming apparatus and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming apparatus that allows for improving user's convenience in the case the number of sheets loaded on a paper-discharge tray reaches a limited number of loadable sheets on the paper-discharge tray upon executing a printing job by the image forming apparatus.SOLUTION: An image forming apparatus comprises a paper-discharge tray for which a limited number of loadable sheets and a surplus number of loadable sheets that is a number of sheets further loadable on the limited number of loadable sheets are set, a job execution part that executes a printing job, a tray-full detector that detects that the number of sheets loaded on the paper-discharge tray reaches the limited number of loadable sheets, and a job-execution determination part that when the tray-full detector detects that the number of sheets loaded on the paper-discharge tray reaches the limited number of loadable sheets during execution of the printing job, if the number of remaining sheets to discharge up to a break point for the printing job under execution is equal to or smaller than the surplus number of loadable sheets, causes the job execution part to execute the printing job up to the break point.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to an image forming apparatus having one or more paper discharge trays each having a sheet stacking limit number set, and a program executed by the image forming apparatus.

  2. Description of the Related Art Image forming apparatuses having one or more paper discharge trays each set with a sheet stacking limit number are known (see Patent Document 1 and Patent Document 2).

JP 2006-40202 A JP 2011-112929 A

  While the image forming apparatus is executing a print job, if the number of sheets stacked on the output tray reaches the stack limit on the output tray, typically the current print job is interrupted. It is desirable to improve user convenience.

  In view of the circumstances as described above, the object of the present disclosure is to enable the user when the number of sheets stacked on the discharge tray reaches the stack limit on the discharge tray while the image forming apparatus is executing a print job. It is to improve convenience.

An image forming apparatus according to an embodiment of the present disclosure includes:
A paper discharge tray in which a sheet stack limit number and a surplus stackable sheet number that is a number of sheets that can be further stacked on the stack limit sheet are set;
A job execution unit for executing a print job;
A tray full detection unit that detects that the number of sheets stacked on the discharge tray has reached the limit number of sheets to be stacked;
When the tray full detection unit detects that the number of sheets stacked on the paper discharge tray has reached the stacking limit number during execution of a print job,
A job execution determination unit that causes the job execution unit to execute up to the separation of the print job when the remaining number of discharged sheets until the separation of the print job being executed is equal to or less than the surplus stackable number of sheets; .

  According to the present embodiment, since the remaining number of discharged sheets until the break of the print job being executed is equal to or less than the surplus stackable number, even if printing is performed until the break of the print job, the surplus stackable number is not exceeded. . For this reason, the print job can be printed with good separation.

The separation of the print job is
Printing to the end of the print job or to the end of any one of a plurality of documents included in the print job.

  According to the present embodiment, since the remaining number of discharged sheets until the break of the print job being executed is equal to or less than the surplus stackable number, even if printing is performed until the break of the print job, the surplus stackable number of sheets is not exceeded. . For this reason, it is possible to print to the end of the print job or the end of any one of a plurality of documents included in the print job.

The job execution determination unit
When the tray full detection unit detects that the number of sheets stacked on the discharge tray reaches the stacking limit number during execution of the print job,
When the remaining number of discharged sheets in the document being printed by the print job being executed is equal to or less than the surplus stackable number, the job execution unit is caused to print the document being printed to the end.

  According to this embodiment, since the remaining number of discharged sheets in the document being printed is equal to or less than the surplus stackable number, printing can be performed with good separation until the end of the document being printed.

The job execution determination unit further includes:
Unless the sum of the remaining number of discharged sheets in the document being printed and the number of discharged sheets of one or more copies to be printed thereafter exceeds the surplus stackable number of sheets, the job execution unit Thereafter, printing is performed up to the end of any one of one or a plurality of documents to be printed.

  According to this embodiment, since the sum of the number of discharged documents of a plurality of copies does not exceed the surplus stackable number, printing can be performed with good separation until the end of any document.

The job execution determination unit
When the remaining number of discharged sheets until the break of the print job being executed exceeds the surplus stackable number of sheets,
The job execution unit interrupts the print job after the break.

  According to this embodiment, since the remaining number of discharged sheets until the print job break exceeds the surplus stackable number of sheets, even if the print job is continued until printing reaches the surplus stackable number of sheets, the print job It doesn't print until the end of the line, and eventually breaks in the middle of the document. For this reason, it is more convenient for the user to interrupt the print job at the present time, that is, at the end of the print job (that is, printing to the end of any one of a plurality of documents included in the print job). good.

The image forming apparatus includes a plurality of the discharge trays,
The job execution determination unit
When the remaining number of discharged sheets until the break of the print job being executed exceeds the surplus stackable number of sheets,
The job execution unit selects another discharge tray and continues the print job after the separation.

  According to this embodiment, since the remaining number of discharged sheets until the print job break exceeds the surplus stackable number of sheets, even if the print job is continued until printing reaches the surplus stackable number of sheets, the print job It doesn't print until the end of the line, and eventually breaks in the middle of the document. For this reason, if some documents are discharged to one discharge tray and other documents are discharged from the beginning to another discharge tray, the separation is good and convenient for the user. good.

A program according to an embodiment of the present disclosure is:
A computer of an image forming apparatus having one or more discharge trays, each of which has a set number of sheets and a surplus stackable number of sheets that can be further stacked on the stacking limit number of sheets. ,
A job execution unit for executing a print job;
A tray full detection unit that detects that the number of sheets stacked on the discharge tray has reached the limit number of sheets to be stacked;
When the tray full detection unit detects that the number of sheets stacked on the paper discharge tray has reached the stacking limit number during execution of a print job,
Operates as a job execution determination unit that causes the job execution unit to execute up to the separation of the print job when the remaining number of discharged sheets until the separation of the print job being executed is equal to or less than the surplus stackable number Let

  According to the present disclosure, it is possible to improve user convenience when the number of sheets stacked on the sheet discharge tray reaches the stacking limit number of sheets on the sheet discharge tray while the image forming apparatus is executing a print job. .

  Note that the effects described here are not necessarily limited, and may be any of the effects described in the present disclosure.

2 shows a hardware configuration of an image forming apparatus according to an embodiment of the present disclosure. 1 shows a functional configuration of an image forming apparatus. 2 shows an operation flow of the image forming apparatus.

1. FIG. 1 illustrates a hardware configuration of an image forming apparatus according to an embodiment of the present disclosure.

  The image forming apparatus 10 is typically an MFP (Multifunction Peripheral), and is simply referred to as MFP 10 hereinafter.

  The MFP 10 includes a control unit 11. The control unit 11 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), a dedicated hardware circuit, and the like, and controls the overall operation of the MFP 10. A computer program that causes the MFP 10 to function as each functional unit (described later) is stored in a non-transitory computer-readable storage medium such as a ROM.

  The control unit 11 is connected to an image reading unit 12, an image processing unit 14, an image memory 15, an image forming unit 16, an operation unit 17, a storage unit 18, a network communication unit 13, and the like. The control unit 11 performs operation control of each of the above connected units and transmission / reception of signals or data to / from each unit.

  The control unit 11 controls the operation of each function such as a scanner function, a print function, and a copy function in accordance with a job execution instruction input from the user through the operation unit 17 or a network-connected personal computer (not shown). Controls the driving and processing of the mechanism necessary to execute.

  The image reading unit 12 reads an image from a document.

  The image processing unit 14 performs image processing on the image data of the image read by the image reading unit 12 as necessary. For example, the image processing unit 14 performs image processing such as shading correction in order to improve the quality after the image read by the image reading unit 12 is formed.

  The image memory 15 has an area for temporarily storing document image data obtained by reading by the image reading unit 12 and temporarily storing data to be printed by the image forming unit 16.

  The operation unit 17 includes a touch panel unit and operation key units that receive instructions from the user regarding various operations and processes that can be executed by the MFP 10. The touch panel unit includes a display unit 17a such as an LCD (Liquid Crystal Display) provided with a touch panel.

  The network communication unit 13 is an interface for connecting to a network.

  The storage unit 18 is a large-capacity storage device such as an HDD (Hard Disk Drive) that stores a document image read by the image reading unit 12.

  The image forming unit 16 forms an image of the image data read by the image reading unit 12. The paper on which the image forming unit 16 has formed (printed) an image is discharged to one or more (one or a plurality, in this embodiment, four) paper discharge trays 19a, 19b, 19c, and 19d. .

  In the typical MFP 10, a sheet stack limit number is set for each of the paper discharge trays 19 a, 19 b, 19 c, and 19 d. For example, the stacking limit number depends on the model of the MFP 10 but is about several tens to several thousand. In a typical MFP 10, the stack limit number is set for each paper discharge tray 19 a, 19 b, 19 c, 19 d, and for each paper type (plain paper, cardboard, etc.) before shipment, and is recorded in, for example, a ROM. Has been. The fact that the stacking limit number is set for each paper type (plain paper, thick paper, etc.) means that, for example, the stacking limit number of plain paper is larger than the stacking limit number of thick paper.

  By the way, although it depends on the mechanical (physical) specifications of the paper discharge trays 19a, 19b, 19c, and 19d, even if a limited number of sheets are stacked on the paper discharge trays 19a, 19b, 19c, and 19d, In addition, there are cases in which several to several tens of sheets of paper can be effectively stacked. In the present embodiment, this “number of sheets that can be further stacked on the limited number of sheets” is referred to as “surplus stackable number of sheets”. Unlike the stacking limit number, the surplus stackable number is not set in a typical MFP 10. However, in the MFP 10 of the present embodiment, the surplus stackable number of sheets is set for each of the paper discharge trays 19a, 19b, 19c, and 19d, and for each paper type (plain paper, cardboard, etc.), for example, a ROM Is recorded. The surplus stackable number may be set and recorded before shipment, or may be manually set and recorded by a service person after shipment. The fact that the surplus stackable number of sheets is set for each paper type (plain paper, cardboard, etc.) means that, for example, the surplus stackable number of plain paper is larger than the surplus stackable number of cardboard. If an attempt is made to discharge paper exceeding the surplus stackable number of sheets, the paper discharge trays 19a, 19b, 19c, and 19d may cause paper jams at the discharge ports to the paper discharge trays 19a, 19b, 19c, and 19d. There is a possibility that the sheets stacked on the trays 19a, 19b, 19c, and 19d may not be taken out. Therefore, the surplus stackable number of sheets is such that no paper jam occurs at the discharge port to the discharge trays 19a, 19b, 19c, and 19d, or the sheets stacked on the discharge trays 19a, 19b, 19c, and 19d are taken out without any trouble. The upper limit is the number of images that can be generated.

2. FIG. 2 shows a functional configuration of the image forming apparatus.

  The MFP 10 loads an information processing program stored in a ROM, which is an example of a computer-readable non-transitory storage medium, into the RAM and executes it, thereby executing a job execution unit 101, a tray full detection unit 102, and a job execution determination. The unit 103 operates.

  The job execution unit 101 executes a print job.

  The tray full detection unit 102 counts the number of discharged sheets by using a sensor or by software processing, thereby confirming that the number of sheets stacked in each of the discharge trays 19a, 19b, 19c, and 19d has reached the stacking limit number. To detect. Here, the sensor is installed for each of the paper discharge trays 19a, 19b, 19c, and 19d, for example, and detects the height of the paper stacked on each of the paper discharge trays 19a, 19b, 19c, and 19d. It may be a simple sensor.

  When the tray full detection unit 102 detects that the number of sheets stacked on the paper discharge tray has reached the stacking limit number during the execution of the print job, the job execution determination unit 103 ends up with the break of the print job being executed. When the remaining number of discharged sheets is equal to or less than the surplus stackable number, the job execution unit 101 is caused to execute until the print job is separated.

3. Operation Flow of Image Forming Apparatus FIG. 3 shows an operation flow of the image forming apparatus.

  The job execution unit 101 receives a print job and starts the print job (step S101). Specifically, the job execution unit 101 forms an image on a sheet based on the print data, and discharges the sheet on which the image is formed to one sheet discharge tray. In the present embodiment, it is assumed that the paper on which the image is formed is discharged to the paper discharge tray 19a. In this embodiment, the “print job” refers to, for example, a job for printing a scanned document on paper, a job for printing print data acquired from an external device (such as a personal computer) on paper, and the like. Means the job to be formed.

  On the other hand, the tray full detection unit 102 detects that the number of sheets stacked on the paper discharge tray 19a has reached the stacking limit number (the paper discharge tray 19a is full) during the execution of the print job (Step S1). S102, YES). The tray full detection unit 102 notifies the job execution determination unit 103 that the number of sheets stacked on the paper discharge tray 19a has reached the stacking limit number (tray full).

  Upon receiving the tray full notification from the tray full detection unit 102, the job execution determination unit 103 reads the surplus stackable number of sheets on the tray full discharge tray 19a from the ROM or the like (step S103). Further, the job execution determination unit 103 makes an inquiry to the job execution unit 101 and calculates the remaining number of discharged sheets in the currently printing document included in the print job being executed. Specifically, the job execution determination unit 103 calculates the number of discharged sheets based on the number of originals of the print data, the duplex setting, the N-Up setting, the number of copies to be printed, and the like. In this embodiment, “document” means a copy unit included in one print job. The number of documents included in one print job may be one or plural. The job execution determination unit 103 determines whether or not the remaining number of discharged sheets in the currently printing document included in the print job being executed is equal to or less than the surplus stackable number (step S104).

  The job execution determination unit 103 determines whether the remaining number of discharged sheets in the currently printing document included in the print job being executed (that is, the currently printing copy when printing one or more copies of the document) is excessive. If it is determined that the number of sheets that can be stacked is exceeded (NO in step S104), the job execution unit 101 immediately interrupts the print job being executed. In other words, the job execution determination unit 103 causes the job execution unit 101 to interrupt printing (stopping an error) the printing of the document currently being printed. This is because even if the document currently being printed is further printed until the surplus stackable number is reached, it is not printed to the end of the document, and is eventually interrupted in the middle of the document. In other words, a document included in a print job cannot be printed with good separation. For this reason, even if the print job is interrupted at this time, the documents included in the print job cannot be printed with good separation, and there is no difference from the case of further printing until the surplus stackable number is reached. is there.

  Alternatively, the job execution determination unit 103 selects another paper discharge tray (discharge tray 19b, 19c, or 19d) and causes the job execution unit 101 to continue the print job being executed (step S107). That is, the MFP 10 executes the process shown in FIG. 3 from step S101 for another selected paper discharge tray. However, in step S101, the job execution unit 101 resumes the print job from the continuation of the document interrupted during printing. Note that the other discharge tray to be selected can be, for example, the highest priority set in the MFP 10. The “priority order” may be, for example, in order of increasing stacking limit number. For example, the priority order may be set and recorded in the ROM before shipment, or may be manually set and recorded by a service person after shipment. In the present embodiment, the priority order is the order of the discharge trays 19a, 19b, 19c, and 19d. In this case, the job execution determination unit 103 selects the uppermost discharge tray 19b among the discharge trays 19b, 19c, and 19d other than the tray full discharge tray 19a.

  On the other hand, the job execution determination unit 103 determines that the remaining number of discharged sheets in the currently printing document included in the print job being executed is equal to or less than the surplus stackable number (YES in step S104). In this case, even if the document currently being printed is printed to the end, the surplus stackable number of sheets is not exceeded, so that the document can be printed with good separation until the end of the document included in the print job. Accordingly, the job execution determination unit 103 causes the job execution unit 101 to print the document currently being printed to the end (step S105). In other words, the job execution determination unit 103 causes the job execution unit 101 to execute until a print job break (printing to the end of the document currently being printed).

  Subsequently, the job execution determination unit 103 makes an inquiry to the job execution unit 101 and determines whether or not the print job includes a document to be printed thereafter (step S106). When the print job includes a document to be printed after that (step S106, YES), the job execution determination unit 103 repeats the processing from step S103 onward for each document. Specifically, it is as follows.

  The job execution determining unit 103 determines that a document to be printed thereafter is included in the print job (YES in step S106). In this case, the job execution determination unit 103 calculates “the number of surplus stackable sheets—the number of sheets printed in step S105” and obtains the current surplus stackable number of sheets (after printing in step S105) (step S103).

  The job execution determination unit 103 determines whether or not the number of discharged sheets of the next document to be printed included in the print job being executed is equal to or less than the current surplus stackable number (step S104).

  The job execution determination unit 103 determines that the number of discharged sheets of the next document to be printed (that is, the next to be printed when printing a plurality of documents) included in the print job being executed is the current surplus. If it is determined that the number of sheets that can be stacked is exceeded (NO in step S104), the job execution unit 101 is not allowed to print the next document to be printed (error stop). In other words, the job execution determination unit 103 interrupts the job execution unit 101 after the print job delimiter (printing up to the end of any one of a plurality of documents included in the print job). Let This is because even if printing of the next document to be printed is started and printing is performed until the surplus stackable number of sheets is reached, printing is not performed to the end of the document, and the process is interrupted in the middle of the document. In other words, a document included in a print job cannot be printed with good separation. For this reason, it is more convenient for the user to interrupt the print job at the present time, that is, at the end of the print job (that is, printing to the end of any one of a plurality of documents included in the print job). good. Alternatively, the job execution determination unit 103 selects another paper discharge tray 19b, and causes the job execution unit 101 to continue the print job being executed (step S107). As a result, a part of the document (that is, a printed part when printing a plurality of documents) is discharged to one discharge tray 19a, and another document (that is, a plurality of documents is copied). The sheet is discharged from the beginning of the unprinted portion when printing) to another discharge tray 19b, which is convenient for the user because of good separation.

  On the other hand, the job execution determination unit 103 determines that the number of ejected documents to be printed next included in the print job being executed is equal to or less than the current surplus stackable number (YES in step S104). In this case, even if the next document to be printed is printed to the end, the surplus stackable number of sheets is not exceeded, so that it is possible to print with good separation to the end of the document included in the print job. Accordingly, the job execution determination unit 103 causes the job execution unit 101 to print the next document to be printed to the end (step S105). In other words, the job execution determination unit 103 causes the job execution unit 101 to execute until a print job break (printing to the end of the next document to be printed).

  In step S107, when the job execution determination unit 103 causes the job execution unit 101 to interrupt the print job that is being executed, the tray full detection unit 102 causes the tray full detection unit 102 to remove the sheet from the tray full discharge tray 19a. When the MFP 10 detects that the number of sheets stacked on the discharge tray 19a is less than the stacking limit number, the MFP 10 may execute the processing shown in FIG. 3 on the discharge tray 19a from step S101. However, in step S101, the job execution unit 101 resumes the print job from the continuation of the document interrupted during printing.

  In this way, the job execution determination unit 103 repeats the processing from step S103 onward for each document. If the job execution determining unit 103 determines that the print job does not include a document to be printed thereafter (including the case where the original print job is one-copy printing) (NO in step S106), the print job is terminated. . “The print job does not include a document to be printed thereafter” (step S106, NO) means the end of the print job (all the documents included in the print job have been printed).

4). Modified Example In this embodiment, after printing to the end of the print job (step S105), “the surplus stackable number of sheets—the number of sheets printed in step S105” is calculated, and the present surplus stackable (after printing in step S105) is possible. The number of sheets was obtained (step S103). Then, the job execution determination unit 103 determines whether or not the number of ejected documents to be printed next included in the print job being executed is equal to or less than the current surplus stackable number (step S104). In short, the order of printing, updating the surplus stackable number of sheets, and determining whether the number of discharged sheets is equal to or less than the current surplus stackable number is made for each document.

  Alternatively, it may be determined whether the total number of discharged sheets of a plurality of documents is equal to or less than the surplus stackable number, and then the plurality of documents may be printed at once.

  Regardless of the order of execution, the job execution determination unit 103 determines that the sum of the remaining number of discharged sheets in the document being printed and the number of discharged sheets of one or more documents to be printed thereafter is the surplus. As long as the stackable number of sheets is not exceeded, the job execution unit 101 can print to the end of any one of one or a plurality of documents to be printed thereafter.

5. Summary Typically, the discharge tray of an MFP has a predetermined number of sheets that can be stacked based on physical restrictions. When more sheets than the stacking limit number are stacked on the sheet discharge tray (tray full), newly discharged sheets are jammed in the discharge port (jam). When the tray full occurs, the MFP interrupts the print job. For example, if the user selects a paper discharge tray having a small number of paper stacking limits even though the number of paper discharged for the print job is large, the tray becomes full in the middle of the print job and the print job is interrupted. As a result, the completion of the print job being executed is delayed, and further, the completion of the subsequent print job is delayed. In order to avoid the tray full, it is necessary for the user to select the discharge tray in consideration of the stacking limit number of the discharge tray, but this is not convenient for the user. In addition, if the user's selected output tray is inappropriate in view of the stacking limit, cancel the print job in the middle, or select another output tray after a tray full occurs in the middle of the print job , Etc., requires another user operation.

  Therefore, according to the present embodiment, the job execution determination unit 103 determines that the remaining number of discharged sheets in the currently printing / next printed document included in the print job being executed is equal to or less than the surplus stackable number. (Step S104, YES). In this case, even if the document that is currently being printed / next printed is printed to the end, the surplus stackable number of sheets is not exceeded, so that it is possible to print with good separation to the end of the document included in the print job. Accordingly, the job execution determination unit 103 causes the job execution unit 101 to print the document currently being printed / next printed to the end (step S105). In other words, the job execution determination unit 103 can cause the job execution unit 101 to execute until a print job break (printing to the end of the document currently being printed / next to be printed).

  Further, according to the present embodiment, the job execution determination unit 103 determines that the number of ejected documents to be printed next included in the print job being executed exceeds the current surplus stackable number (step (S104, NO), the job execution unit 101 is not allowed to print the next document to be printed (error stop). In other words, the job execution determination unit 103 interrupts the job execution unit 101 after the print job delimiter (printing up to the end of any one of a plurality of documents included in the print job). Let This is because even if printing of the next document to be printed is started and printing is performed until the surplus stackable number of sheets is reached, printing is not performed to the end of the document, and the process is interrupted in the middle of the document. In other words, a document included in a print job cannot be printed with good separation. For this reason, it is more convenient for the user to interrupt the print job at the present time, that is, at the end of the print job (that is, printing to the end of any one of a plurality of documents included in the print job). good. Alternatively, the job execution determination unit 103 selects another paper discharge tray 19b, and causes the job execution unit 101 to continue the print job being executed (step S107). As a result, a part of the document is discharged to one discharge tray 19a until another document is discharged, and another document is discharged from the beginning to another discharge tray 19b. good.

  Although the embodiments and modifications of the present technology have been described above, the present technology is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present technology. Of course.

10. MFP (image forming apparatus)
19a, 19b, 19c, 19d ... discharge tray 101 ... job execution unit 102 ... tray full detection unit 103 ... job execution determination unit

Claims (7)

A paper discharge tray in which a sheet stack limit number and a surplus stackable sheet number that is a number of sheets that can be further stacked on the stack limit sheet are set;
A job execution unit for executing a print job;
A tray full detection unit that detects that the number of sheets stacked on the discharge tray has reached the limit number of sheets to be stacked;
When the tray full detection unit detects that the number of sheets stacked on the paper discharge tray has reached the stacking limit number during execution of a print job,
A job execution determination unit that causes the job execution unit to execute up to the separation of the print job when the remaining number of discharged sheets until the separation of the print job being executed is equal to or less than the surplus stackable number of sheets; Image forming apparatus. The image forming apparatus according to claim 1,
The separation of the print job is
An image forming apparatus for printing until the end of the print job or the end of any one of a plurality of documents included in the print job. The image forming apparatus according to claim 2,
The job execution determination unit
When the tray full detection unit detects that the number of sheets stacked on the discharge tray reaches the stacking limit number during execution of the print job,
An image forming apparatus that causes the job execution unit to print the document being printed to the end when the remaining number of discharged sheets in the document being printed by the print job being executed is equal to or less than the surplus stackable number. The image forming apparatus according to claim 3, wherein
The job execution determination unit further includes:
Unless the sum of the remaining number of discharged sheets in the document being printed and the number of discharged sheets of one or more copies to be printed thereafter exceeds the surplus stackable number of sheets, the job execution unit An image forming apparatus that prints up to the end of any one or more documents to be printed thereafter. An image forming apparatus according to any one of claims 1 to 4,
The job execution determination unit
When the remaining number of discharged sheets until the break of the print job being executed exceeds the surplus stackable number of sheets,
An image forming apparatus that causes the job execution unit to interrupt the print job after the separation. An image forming apparatus according to any one of claims 1 to 4,
A plurality of the paper discharge trays;
The job execution determination unit
When the remaining number of discharged sheets until the break of the print job being executed exceeds the surplus stackable number of sheets,
An image forming apparatus that causes the job execution unit to select another discharge tray and continue the print job after the separation. A computer of an image forming apparatus having one or more discharge trays, each of which has a set number of sheets and a surplus stackable number of sheets that can be further stacked on the stacking limit number of sheets. ,
A job execution unit for executing a print job;
A tray full detection unit that detects that the number of sheets stacked on the discharge tray has reached the limit number of sheets to be stacked;
When the tray full detection unit detects that the number of sheets stacked on the paper discharge tray has reached the stacking limit number during execution of a print job,
Operates as a job execution determination unit that causes the job execution unit to execute up to the separation of the print job when the remaining number of discharged sheets until the separation of the print job being executed is equal to or less than the surplus stackable number Program to make.

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