JP2007163559A - Image forming apparatus and control method for image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus to which a post processing apparatus requiring warming up is connected, and which shortens its processing time for set jobs by determining executing order of the jobs, based on content of the job, executing time and time for completion of warming up, and also to provide a control method for the image forming apparatus. <P>SOLUTION: The image forming apparatus to which the post processing apparatus is connected is provided with: a first calculating means calculating the processing time for the job to which post processing requiring warming up is not applied among a plurality of set jobs; a second calculating means calculating the time for completion of the warming up in the post processing apparatus; and a job order determining means determining the executing order for the plurality of jobs set by an input operation means, based on the processing time for the jobs and the time for completion of the warming up for the post processing apparatus before completion of warming up for the post processing apparatus. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image forming apparatus to which a post-processing apparatus that requires warm-up is connected, and a control method therefor.

  In recent years, image forming apparatuses that perform simple bookbinding by connecting a post-processing apparatus that performs bookbinding processing have come to be frequently used.

  An image forming apparatus used for such a purpose generally has a high speed and a high capacity, and can be effectively used for other purposes required in the office besides bookbinding. Therefore, two types of operations, an image forming operation for performing bookbinding processing and an image forming operation for which no bookbinding operation is performed, are performed using the image forming apparatus.

  A high-speed, high-capacity image forming apparatus normally has a function of presetting a plurality of image forming work contents (referred to as job setting) and sequentially executing the set jobs.

  In such an image forming apparatus, when a job in a certain order cannot be executed, a job in the subsequent order may be awaited to be executed together with the job. As a proposal for dealing with such inconvenience, there is also a proposal for determining the job execution order set according to the operation status of the post-processing apparatus (for example, see Patent Documents 1 and 2). That is, it is confirmed whether each processing module of the post-processing apparatus, for example, punching means, shifting means, folding means, binding means, etc. is in a usable state, and a job that can be processed only by an available processing module is then executed. By setting this as a job to be executed, the delay of all the processing times of a plurality of set jobs is prevented.

However, in an image forming apparatus to which a post-processing device that requires warm-up is connected, between the warm-up time (for example, 5 minutes) of the image forming device and the warm-up time (for example, 15 minutes) of the post-processing device. There is also a problem that the job cannot be started until the longer warm-up time is completed.
Japanese Patent Laid-Open No. 10-42080 (page 1-2) JP 2004-179788 A (first page)

  SUMMARY An advantage of some aspects of the invention is that it is an image forming apparatus to which a post-processing apparatus that requires warm-up is connected, the job content and the execution time, It is an object of the present invention to provide an image forming apparatus and a control method for the image forming apparatus that reduce the total processing time of the set job by determining the job execution order based on the warm-up completion time.

The object is achieved by the invention described below.
1. An image forming apparatus to which a post-processing device requiring warm-up is connected,
Input operation means for setting a plurality of jobs;
A first calculation unit that calculates a processing time of a job that is not subjected to post-processing that requires warm-up among a plurality of set jobs;
Second calculating means for calculating a warm-up completion time of the post-processing device;
A job that determines the execution order of a plurality of jobs set by the input operation means based on the processing time of the job and the warm-up completion time of the post-processing device before the warm-up of the post-processing device is completed. An image forming apparatus comprising: an order determining unit.
2. The job order determining means includes
If there is a job that does not perform post-processing that requires warm-up among the set jobs and the processing time is determined not to exceed the warm-up completion time of the post-processing device, The image forming apparatus according to claim 1, wherein the job execution order is determined so that the job is executed with priority over a job to be post-processed.
3. The job order determining means includes
Among the set jobs, jobs that do not perform post-processing that requires warm-up, and the absolute value of the difference between the processing time and the warm-up completion time of the post-processing device is a predetermined value set in advance. 2. The image forming method according to claim 1, wherein when there is a job that is determined to be smaller than a constant, the job execution order is determined so that the job is executed with priority over a job to be post-processed. apparatus.
4). The job order determining means includes
Among the set jobs, jobs that do not undergo post-processing that requires warm-up, and that the processing time is determined to be smaller than the value obtained by multiplying the warm-up completion time of the post-processing device by a predetermined coefficient. 2. The image forming apparatus according to claim 1, wherein the job execution order is determined so that the job is executed with priority over the job to be post-processed when there is a job to be processed.
5. A method of controlling an image forming apparatus connected to a post-processing apparatus that requires warm-up, wherein a plurality of jobs are set by an input operation unit,
Among the set jobs, the processing time of jobs that do not perform post-processing that requires warm-up, and
Calculate the warm-up completion time of the post-processing device,
Determining the execution order of the plurality of jobs set by the input operation means based on the processing time of the job and the warm-up completion time of the post-processing device before the warm-up of the post-processing device is completed; And a control method for the image forming apparatus.
6). If there is a job that does not perform post-processing that requires warm-up among the set jobs and the processing time is determined not to exceed the warm-up completion time of the post-processing device, 6. The method of controlling an image forming apparatus according to claim 5, wherein the job execution order is determined so that the job is executed with priority over the job to be post-processed.
7). Among the set jobs, jobs that do not perform post-processing that requires warm-up, and the absolute value of the difference between the processing time and the warm-up completion time of the post-processing device is a predetermined value set in advance. 6. The image formation according to claim 5, wherein when there is a job determined to be smaller than a constant, the job execution order is determined so that the job is executed with priority over a job to be post-processed. Control method of the device.
8). Among the set jobs, a job that does not undergo post-processing that requires warm-up, and the processing time is determined to be smaller than a value obtained by multiplying the warm-up completion time of the post-processing device by a predetermined coefficient. 6. The method of controlling an image forming apparatus according to claim 5, wherein the job execution order is determined so that the job is executed with priority over the job to be post-processed when the job is present.

  According to the present invention, when the post-processing apparatus is in the warm-up state, the post-processing by the post-processing apparatus is not required, and jobs that can be processed by the completion of the warm-up are preferentially executed. The waiting time is reduced, the image forming apparatus is operated efficiently, and the total processing time of a plurality of set jobs is shortened.

  Next, an embodiment according to the present invention of an image forming apparatus to which a post-processing apparatus having a bookbinding function is connected will be described with reference to the drawings.

  FIG. 1 is an overall configuration diagram of an image forming system including an image forming apparatus A, an automatic document feeder F, and a post-processing apparatus B.

  The automatic document feeder F feeds the documents placed on the document placing table 11 one by one to the document conveying means and discharges them to the document discharge table 12. The original image is read by the slit 13 which is the image reading position of the image reading means 2 of the image forming apparatus.

  When reading both sides of a document image, the document reversing unit 14 having a pair of reversible rollers reverses the document on which the first surface is read, and then sends the document back to the document conveying unit to send it again to the second surface. Let it read.

  The image forming apparatus A includes an image reading unit 2, an image writing unit 3, an image forming unit 4, an input operation unit 5, a paper feeding unit 6, a paper discharge refeed unit 7, a fixing unit 8, a control unit C1, and the like. The

  The image reading means 2 is a means for obtaining image data by reading an original image. The original image irradiated with a lamp at the position of the slit 13 is converted into a first mirror unit 23, a second mirror unit 24, and the like. The image forming lens 25 forms an image on the image sensor 26 which is a linear CCD. The signal output from the image pickup device 26 is A / D converted by the image processing unit of the control means C1, subjected to processing such as shading correction and image compression, and stored as image data in the memory M1.

  The image writing means 3 is based on the image data that has been called from the memory M1 and subjected to predetermined image processing, and is rotated by being charged by the charging means 42 with a laser beam and a polygon mirror. The surface is scanned to form an electrostatic latent image corresponding to the original image on the peripheral surface of the photoreceptor 41.

  The electrostatic latent image is reversely developed by the developing unit 44 of the image forming unit 4 to form a toner image on the photoreceptor 41.

  Corresponding to the timing of toner image formation, the paper P is fed from the paper feed means 6 having a plurality of paper feed trays TR1 to TR3 and is transported by a transport roller and a guide member. Synchronization with the toner image formed above is synchronized and sent to the transfer area.

  In the transfer area, the toner image formed on the surface of the photoreceptor 41 is transferred to the paper P charged to the opposite polarity by the transfer means 45.

  The sheet P carrying the toner image is separated from the surface of the photosensitive member 41 by the action of the separation / elimination means 46 and sent to the fixing means 8.

  In the fixing unit 8, the paper P carrying a toner image is conveyed while being heated and pressurized by a heating roller and a pressure roller, the toner image is fixed on the paper P, and is discharged to the post-processing device B by a discharge roller 73. Sent out.

  The leading edge of the paper P to be sent is detected by a paper discharge sensor provided downstream of the discharge roller, and the control means C1 that has received the detection signal outputs post-processing information (page information) applied to the paper P to be sent. Send to the second control means C2.

  Further, when the paper P is turned upside down and sent to the post-processing apparatus B, the switching guide 72 guides the paper P to the paper discharge re-feeding means 7 and switches the paper P back to the discharge roller 73. .

  Further, when forming an image on both sides of the paper P, the paper P, which has been fixed on the first side, is guided to the paper discharge refeeding means 7 by the switching guide 72 and reversed by the reversing unit 75. Then, it is sent out to the conveyance path for paper feed and used for image formation on the second surface.

  On the other hand, the surface of the photoconductor 41 after the transfer of the toner image onto the paper P is prepared for the next image formation after the residual toner is removed by the cleaning means 47.

  The input operation means 5 is a known means using a touch panel, and the user can input various instruction information including job setting by touching a predetermined part of the touch panel.

  The post-processing apparatus B connected to the paper discharge unit side of the image forming apparatus A is a known bookbinding apparatus called a gluing bookbinding apparatus.

  2 is a front sectional view showing the concept of the post-processing apparatus B, FIG. 3 is a side sectional view, FIG. 4 is an upper sectional view, and FIG. 5 is a three-dimensional view.

  The post-processing apparatus B includes a top direct discharge unit 10, a horizontal transfer unit 20A below it, a direction changing transfer unit 30A, a sheet storage unit 40A, a discharge unit 50A, a first sheet supply unit (cover cover sheet sheet supply unit). ) 70A, a sheet conveying apparatus provided with a second sheet feeding means (back cover sheet feeding means) 70B, a first glue discharging means 80A, and a glue supplying apparatus 89.

  The paper P introduced into the receiving unit 11 is sent by the switching plate 12 to either the upper direct paper discharge unit 10 or the horizontal transport unit 20A.

  The paper P introduced directly into the paper discharge means 10 is transported upward, sandwiched between the transport rollers 13 and 14, and discharged onto the fixed paper discharge tray 16 by the discharge rollers 15.

  When the shift mode or the non-sort large-volume discharge mode is set, the switching plate 12 directly closes the transfer path of the discharge unit 10 and opens the transfer path of the horizontal transfer unit 20A to allow the sheet S to pass. . The paper P introduced into the horizontal conveying means 20A is nipped and conveyed by the conveying rollers 21, 22, 23, 24, and the paper P not subjected to the glue application process is nipped by the paper discharge roller 26 through a shift means (not shown). Then, the paper is discharged from the upper discharge port 27 onto the lifting / lowering tray 63. For example, a maximum of 3000 sheets of paper P can be stacked on the lifting / lowering tray 63.

  When the job for performing the glue binding process is set, the paper P discharged from the image forming apparatus A is nipped and conveyed by the conveyance rollers 21 to 24. When the leading end of the paper P comes into contact with the positioning member 25, the bending of the paper P in the transport direction is corrected. Thereafter, the upper rollers of the transport rollers 21 to 24 are retracted upward from the sheet surface and the pressure contact is released.

  Next, the paper P is sandwiched between the transport rollers 31 and 32 and transported in a direction deflected by 90 degrees (indicated by an arrow Y1 in FIG. 3). The paper P is continuously nipped by the transport rollers 33 and 34, transported in a U-turn, and sent to the paper storage unit 40A.

  The glue discharging means 80A discharges glue in a linear or broken line shape on one side edge of the paper P conveyed by the conveying rollers 31 to 34, and forms a glue application portion N on the upper surface of the paper P. FIG. 6 is a diagram illustrating an example of the glue application unit N. As illustrated in FIG.

  The first sheet P is not subjected to the glue application process, is sandwiched and conveyed by the conveyance rollers 33 and 34 of the direction changing conveyance unit 30A, is sent to the fourth conveyance path Y2, and is placed on the paper placement table 41. The The second and subsequent sheets S subjected to the glue application process are sandwiched and conveyed by the conveying rollers 33 and 34 and stacked on the preceding sheet to form a sheet bundle Pa.

  When a cover sheet (front cover or back cover) of the same size as the sheet bundle Pa is attached to the sheet bundle Pa, the first sheet feeding means 70A or the second sheet feeding means arranged at the lower part of the post-processing apparatus B Cover paper is supplied from 70B. The cover sheets Ka and Kb accommodated in the sheet feeding cassette 71A of the first sheet feeding unit 70A or the sheet feeding cassette 71B of the second sheet feeding unit 70B are fed by the sheet feeding unit 72A or the sheet feeding unit 72B and conveyed. After passing through the rollers 73 and 74 and transported by the horizontal transport means 20A, a glue application portion N is formed by the first glue discharge means 80A, and sent to the paper storage section 40A via the direction changing transport means 30A, and the paper Affixed to the uppermost surface of the bundle Pa.

  The glue used in the embodiment of the present invention is an aqueous emulsion glue, for example, a vinyl acetate resin emulsion glue, and has a viscosity of 750 to 1500 mPa · s at room temperature. The sheet bundle Pa bonded with the water-soluble glue can be reused as recycled paper.

  Next, the moving pressurizing means 44 pressurizes and moves the back surface side of the glue application portion N forming surface of the preceding sheet bundle Pa placed on the sheet placing table 41 to ensure adhesion between the sheets. (See FIG. 5). The leading edge of the paper P is in contact with the leading edge stopper 45 and is aligned at the leading edge. The leading end stopper 45 can be moved by a driving means (not shown) and stops at a predetermined position by setting the size of the paper P. The trailing edge of the sheet P is aligned with the trailing edge of the sheet and pressed on the top surface of the trailing edge of the sheet by a sheet alignment pressing unit 46 that is movably driven. Both side edges of the paper P are positioned by the width aligning means 47. Note that alignment and positioning of the front end, rear end, and both end portions of the paper P is performed before the pressurizing process by the pressurizing unit 44. The pressurizing process of the paper P by the pressurizing unit 44 may be performed every time the second and subsequent papers P are placed on the paper placing table 41. Alternatively, the pressing process may be performed every time a plurality of sheets P are stacked.

  One sheet bundle Pa subjected to the gluing process is completed by the above steps. In this post-processing apparatus B, for example, a maximum of 200 sheets of paper P can be glued to be bound.

  A plurality of discharge belts 53 wound around a driving roller 51 and a driven roller 52 are rotatably disposed on a part of the sheet stacking surface of the sheet placing table 41.

  The glued and bound sheet bundle Pa is held on the rear end portion of the sheet bundle Pa by the discharge claw 53a of the rotating discharge belt 53, and slides on the placement surface of the sheet placement table 41 to discharge the sheet bundle. It is sandwiched between the rollers 54 and is discharged from the lower discharge port 55 to the lifting / lowering tray 63. Prior to the paper discharge process, the pressurizing unit 44 and the width aligning unit 47 are retracted above the transport path by a driving unit (not shown).

  The above-described post-processing apparatus B includes a second post-processing apparatus B2 (case binding manufacturing apparatus) that glues and binds the front cover and the back cover to the front and back surfaces and back of the sheet bundle Pa to produce the booklet Pb. In some cases, a plurality of post-processing devices having other functions are connected back and forth.

  FIG. 7 is an overall configuration diagram of an image forming system in which two post-processing devices, a post-processing device B and a second post-processing device B1, are connected to the image forming device A.

  FIG. 8 is a diagram illustrating an example of a case-bound booklet.

  The second post-processing device B1 is also a known device, like the post-processing device B, and therefore will not be described, but has means necessary for gluing processing for case binding.

  The glue used for gluing is accommodated in a glue supply device 89 shown in FIG. 3, and the glue supply device 89 is warmed to a predetermined temperature so that the glue has a constant viscosity, so that the glue maintains its viscosity. Control housing temperature.

  The time required for such glue to reach a certain temperature and be used for glue binding is the rate-limiting time for warming up the post-processing apparatus B. The warm-up time TB (for example, 15 to 20 minutes) is longer than the warm-up time TA (for example, 5 minutes) of the image forming apparatus A.

  Accordingly, when a plurality of jobs are set and the first set job is a job to be bound, the high-speed image forming apparatus A does not complete the warm-up, but the time of TB-TA, A situation occurs where the image forming operation cannot be started. Since the high-speed image forming apparatus A can perform a large amount of image forming processing in a short time, this waiting time (TB-TA) is a serious problem from the viewpoint of efficiently using the image forming apparatus.

  Next, an image forming apparatus that solves such a problem and a method for controlling the image forming apparatus will be described.

  FIG. 9 is a block diagram illustrating a control relationship of the image forming apparatus A to which the post-processing apparatus B is connected.

  The control means C1 of the image forming apparatus A is a computer system including a CPU (CPU1), a memory M1, and an arithmetic unit, an I / O port, a communication interface, etc. (not shown). It also has a circuit for doing this. Each means is controlled by executing a program corresponding to the job stored in the memory M1.

  The automatic document feeder F and the post-processing apparatus B are also small in comparison with the control unit C1, but include control units C2 and C3 which are similar computer systems centered on the CPU. Information exchange between the control means C1 and the other control means C2 and C3 is performed via the communication means T2 and T3 in this example, but other known means can be used as appropriate.

  The control unit C1 is connected to a LAN or a public line via the communication unit T1, and can exchange data with other information devices.

  In addition, description in a figure is abbreviate | omitted about the block considered not to be important for description of embodiment of this invention.

  FIG. 10 is a flowchart showing a flow of determining the job execution order after the image forming apparatus A and the post-processing apparatus B are turned on and the warm-up is started.

  When the job order determination unit M13, which is a program, is executed, first, the warm-up state of the image forming apparatus is confirmed (step S1). If the warm-up has been completed (step S1: Y), The warm-up state of the post-processing device is confirmed (step S2). If the warm-up of the post-processing device has been completed (step S2: Y), the registered job table M10, which is a table in which the set jobs are arranged in the execution order, is referred to (step S31). If there is a job (step S31: Y), the job at the head of the order is executed (step S32), and if there is no registered job (step S31: N), the routine is exited.

  If the warm-up of the post-processing apparatus has not been completed in step S2 (step S2: N), it is determined whether there is a job registered in the registered job table M10 (step S3). If there is no registered job (step S3: N), the process returns to the confirmation of the warm-up state of the post-processing apparatus (step S2). If there is a registered job (step S3: Y), It is determined whether a job that has already been registered and does not require completion of the warm-up of the post-processing device is being executed (step S4). If it is being executed (step S4: Y), the process returns to step 2. If it is not being executed (step S4: N), the job registered at the top of the registered job table M10 has completed the warm-up of the post-processing device. In step S5, it is determined whether the job is a job for post-processing the paper P.

  If the job registered at the top of the registered job table M10 is a job that does not perform post-processing that requires warm-up of the post-processing device (step S5: N), the job is immediately executed. Moved to.

  If the job registered at the top of the registered job table M10 is a job that performs post-processing that requires warm-up (step S5: Y), warm-up is required in the registered job table M10. In other words, it is determined whether or not a job to be subjected to post-processing, in other words, a job not to be subjected to post-processing that requires warm-up is registered (step S6), and warm-up is required in the registered job table M10. If no job to be post-processed is registered (step S6: N), the process returns to step 2; if registered (step S6: Y), the warm-up completion time WT of the post-processing device is calculated. Warm-up completion time WT and warm-up are required by the second calculation means M12 which is a processing routine to Processing time PT job is calculated by the first calculating means M11 is a processing routine for calculating the processing time PT jobs not subjected to post-processing (step S7, S8).

  If the calculated warm-up completion time WT of the post-processing apparatus and the processing time PT of the job not subjected to post-processing are not PT ≦ WT (step S9: N), that is, no post-processing is performed. If it is determined that the job processing cannot be completed by the completion of the warm-up of the post-processing device, the process returns to step 2 in order to wait for the warm-up completion and execute the post-processing. If PT ≦ WT (step S9: Y), that is, if it is determined that the job processing without post-processing can be completed before the warm-up of the post-processing device is completed, the post-processing is performed. A job not to be applied is placed at the top of the registered job table M10 (step S10). Next, the first job is executed (step S11), and the routine is exited.

  Note that the calculation of the processing time of the job not subjected to post-processing in step S8 is performed for all the jobs not subjected to post-processing registered in the registered job table M10, and is a job satisfying the condition PT ≦ WT. The job having the highest order registered in the registered job table M10 is placed at the top of the registered job table M10 in step S10.

  Also, the determination criterion in step S9 may be | PT-WT | ≦ α or PT ≦ kWT instead of PT ≦ WT (PT−WT ≦ 0). Α is a predetermined constant, and k is a predetermined coefficient, which is preset in the memory M1 and can be changed by the input operation means 5. By providing such α and k, the user can set a criterion for determining whether or not to execute a process that does not perform the post-processing before the warm-up of the post-processing apparatus is completed in accordance with the user's actual work.

  By implementing the image forming apparatus and the image forming apparatus control method as described above, the execution order of a plurality of set jobs is appropriately set in the image forming apparatus to which the post-processing apparatus requiring warm-up is connected. Can be determined.

1 is an overall configuration diagram of an image forming system. It is front sectional drawing which shows the concept of a post-processing apparatus. It is a sectional side view which shows the concept of a post-processing apparatus. It is an upper section showing the concept of a post-processing device. It is a three-dimensional view which shows the concept of a post-processing apparatus. It is a figure which shows the example of a paste application part. 1 is an overall configuration diagram of a system in which two post-processing devices are connected to an image forming apparatus. It is a figure which shows the example of the booklet which carried out case binding. FIG. 3 is a block diagram illustrating a control relationship of an image forming apparatus to which a post-processing device is connected. It is a flowchart which shows the flow which determines the execution order of a job.

Explanation of symbols

5 input operation means A image forming apparatus B post-processing apparatus B1 second post-processing apparatus case binding apparatus C1 control means (image forming apparatus)
M10 registered job table M11 first calculation means M12 second calculation means M13 job order determination means

Claims (8)

An image forming apparatus to which a post-processing device requiring warm-up is connected,
Input operation means for setting a plurality of jobs;
A first calculation unit that calculates a processing time of a job that is not subjected to post-processing that requires warm-up among a plurality of set jobs;
Second calculating means for calculating a warm-up completion time of the post-processing device;
A job that determines the execution order of a plurality of jobs set by the input operation means based on the processing time of the job and the warm-up completion time of the post-processing device before the warm-up of the post-processing device is completed. An image forming apparatus comprising: an order determining unit. The job order determining means includes
If there is a job that does not perform post-processing that requires warm-up among the set jobs and the processing time is determined not to exceed the warm-up completion time of the post-processing device, The image forming apparatus according to claim 1, wherein the job execution order is determined so that the job is executed with priority over a job to be post-processed. The job order determining means includes
Among the set jobs, jobs that do not perform post-processing that requires warm-up, and the absolute value of the difference between the processing time and the warm-up completion time of the post-processing device is a predetermined value set in advance. 2. The image according to claim 1, wherein when there is a job determined to be smaller than a constant, the job execution order is determined so that the job is executed with priority over a job to be post-processed. Forming equipment. The job order determining means includes
Among the set jobs, jobs that do not undergo post-processing that requires warm-up, and that the processing time is determined to be smaller than the value obtained by multiplying the warm-up completion time of the post-processing device by a predetermined coefficient. The image forming apparatus according to claim 1, wherein the job execution order is determined so that the job is executed with priority over the job to be post-processed when there is a job to be processed. A method for controlling an image forming apparatus to which a post-processing apparatus requiring warm-up is connected, wherein a plurality of jobs are set by an input operation unit,
Among the set jobs, the processing time of jobs that do not perform post-processing that requires warm-up, and
Calculate the warm-up completion time of the post-processing device,
Determining the execution order of the plurality of jobs set by the input operation means based on the processing time of the job and the warm-up completion time of the post-processing device before the warm-up of the post-processing device is completed; And a control method for the image forming apparatus. If there is a job that does not perform post-processing that requires warm-up among the set jobs and the processing time is determined not to exceed the warm-up completion time of the post-processing device, 6. The method of controlling an image forming apparatus according to claim 5, wherein the job execution order is determined so that the job is executed with priority over a job to be post-processed. Among the set jobs, jobs that do not perform post-processing that requires warm-up, and the absolute value of the difference between the processing time and the warm-up completion time of the post-processing device is a predetermined value set in advance. 6. The image according to claim 5, wherein when there is a job determined to be smaller than a constant, the job execution order is determined so that the job is executed with priority over a job to be post-processed. Control method of forming apparatus. Among the set jobs, a job that does not undergo post-processing that requires warm-up, and the processing time is determined to be smaller than a value obtained by multiplying the warm-up completion time of the post-processing device by a predetermined coefficient. 6. The method of controlling an image forming apparatus according to claim 5, wherein the job execution order is determined so that the job is executed with priority over the job to be post-processed when there is a job to be processed.