JP6008626B2 - Inspection device, printing system and control method therefor - Google Patents

Description

  The present invention relates to an inspection apparatus, a printing system, and a control method for inspecting printed matter printed by a printing apparatus.

  Conventionally, in the commercial printing industry, printed materials have been issued through various work processes. Specific work steps include manuscript submission, layout editing, proofreading, proof printing, block creation, printing, post-processing, inspection, and delivery of deliverables to customers.

  In particular, in the case of the commercial printing industry, since an offset plate-making printing machine is often used in the printing process, it is an indispensable process. However, once a composition is created, its correction is not easy. In addition, if the composition is corrected, it is very disadvantageous in terms of cost, so careful proofreading work is required when creating the composition. For this reason, in general, it takes a certain period of time to complete the issuance of printed matter.

  On the other hand, recently, with the speeding up of printing by electrophotographic method and ink jet method and higher image quality, it is possible to print on demand that can print a small amount of required copies and deliver it in a short period of time against the commercial printing industry. A market called POD) has also emerged. In such a POD market, it is possible to provide a digital print service that enables electronic data submission and layout editing.

  In the commercial printing industry and the POD market, inspection work to check for defects such as printing mistakes and dirt before delivering deliverables to customers is mainly done by manual and visual inspection of workers. Currently. For this reason, it is required to automate inspection work in order to reduce labor costs and shorten the time required for inspection. Conventionally, an inspection apparatus for automatically performing inspection work has been provided offline. When using this off-line inspection device, the work of collecting the printed products up to a certain amount and then transporting them to the inspection device manually, pouring the products into the paper feed port for inspection, and reading them. It was necessary.

  With the recent development of high-speed image sensors, inspection devices can be incorporated in-line. In a printing system incorporating an inspection device in-line, it is desirable to control the paper feeding unit in real time when a defect is detected during printing. In the conventional technology, when a defect is detected in the inspection process, the paper feeding operation is interrupted, and the printing failure is continuously detected for the paper already fed at that time (for example, Patent Document 1). ).

JP 2010-42601 A

  In the prior art, when a defective image is detected in the inspection process, the paper feeding unit is controlled to interrupt the paper feeding operation, and image formation, image reading, and image defect detection are performed on a predetermined number of fed paper. Detection continued. However, in the case of a device capable of printing at a high speed, for example, 100 sheets per minute, as used in the POD market, after receiving a command from the control system after detecting a defect in the inspection process, the paper feed at the end There is a time lag before the unit actually stops its operation.

  The above-mentioned control system is roughly divided into two systems, a paper feeding system and an image forming system. These two systems actually completely stop each process after receiving a stop instruction from the inspection device. It takes time to complete. As a result, one of the two independent systems of the paper feeding system and the image forming system in the printing apparatus stops first, and the other stops after a delay. Therefore, after receiving a stop instruction from the inspection device, it is necessary to perform processing in consideration of the stop timings of these two independent systems.

  An object of the present invention is to solve the above-mentioned problems of the prior art.

An object of the present invention is to record the log information of a defect detected from a printed material in which printing is interrupted and the type of defect detected from the printed material executed without being interrupted, separately from log information. An object of the present invention is to make it possible to use for identifying a faulty part of a printing apparatus when analyzing the cause of a malfunction of the printing apparatus.

In order to achieve the above object, an inspection apparatus according to one aspect of the present invention has the following configuration. That is,
An inspection device that receives and inspects printed matter printed by a printing device,
Detecting means for detecting defects of the printed matter by reading the printed matter and comparing it with the original image data;
Storage means for storing, as log information, information indicating defects of the printed matter detected by the detection means;
Issuance means for issuing a stop instruction to stop feeding and printing in the printing apparatus when a defect is detected by the detection means;
The detection means for the printed matter fed by the printing apparatus after the stop instruction is issued by the issuing means and before the feeding by the printing apparatus is stopped by the stop instruction. have a, and control means for controlling to execute continuously the detection process by,
The storage means stores the printed matter fed by the printing apparatus after the stop instruction is issued by the issuing means and before the feeding by the printing apparatus is stopped by the stop instruction. On the other hand, log information regarding the white spot image detected by the detection unit when the detection process by the detection unit is continuously executed is displayed by the detection unit before the stop command is issued by the issue unit. It is characterized in that it is stored as log information different from the information indicating the detected defective printed matter .

According to the present invention, by recording the log information of a defect detected from a printed matter whose printing has been interrupted and the type of defect detected from the printed matter executed without being interrupted, separately from the log information. In the cause analysis of the malfunction of the printing apparatus, there is an effect that it can be used for specifying the failure location of the printing apparatus.

1 is a block diagram illustrating a configuration of a printing system including a printing apparatus (multifunction machine) according to an embodiment of the invention. The block diagram which shows the structure of the inspection apparatus which concerns on embodiment. FIG. 3 is a block diagram illustrating a configuration of an image processing unit according to the embodiment. The flowchart explaining the process by the inspection apparatus which concerns on embodiment. FIG. 6 is a diagram for explaining a path through which each control module of two independent systems, that is, a paper feeding system and an image forming system of the MFP according to the embodiment, transmits a command to a terminal module after receiving a stop command from an inspection apparatus. FIG. 5 is a diagram illustrating a defective image printed on a sheet together with a time axis when the image forming system is stopped first, out of two independent control modules of a paper feeding system and an image forming system of the MFP according to the embodiment. . FIG. 6 is a diagram for explaining a defective image printed on a sheet along with a time axis when each of the two independent control modules of the MFP according to the embodiment, that is, a paper feed system and an image forming system, is stopped first. . FIG. 6 is a flowchart for explaining processing of the inspection apparatus during a period from when an instruction to stop feeding and printing is issued to the MFP in S406 of FIG. 4 until feeding and printing are completely stopped. The flowchart explaining the process by the inspection apparatus which concerns on other embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments do not limit the present invention according to the claims, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the present invention. .

  FIG. 1 is a block diagram illustrating a configuration of a printing system including a printing apparatus (multifunction machine) according to an embodiment of the present invention.

  A multifunction peripheral (MFP) 110 includes a controller 112 that controls image formation and a printer engine 151. The network I / F 111 receives print data generated by the printer driver 102 of the host PC 101 via the network 104. The controller 112 includes a CPU 113, a hard renderer 117, an image processing unit 119, a printer engine control unit 120, and the like. The interpreter 114 of the CPU 113 interprets PDL, which is a page description language of the received print data, and generates intermediate language data 115. The hard renderer 117 generates a raster image 118 from the intermediate language data 115. The image processing unit 119 performs image processing on the raster image 118 and image data read by the scanner 132.

  The printer engine 151 receives a command from the printer engine control unit 120, activates a drive system such as paper conveyance, and returns the status of each unit in the printer engine to the printer engine control unit 120. The control data 116 includes information regarding the number of sheets to be printed, the size of the sheet, the type of sheet, the setting of the finisher used in the post-processing process, and the like set by the user via the driver 102.

  The ROM 140 stores a control program for the CPU 113. The RAM 141 provides a work memory for the CPU 113. The HDD control unit 142 controls the document file and the raster image 118 to be stored in the hard disk drive (HDD) 133 and read from the HDD 143.

  The printer engine 151 connected to the controller 112 forms an image on paper using colored toners such as cyan (C), magenta (M), yellow (Y), and black (Bk). The paper feed system unit 150 feeds paper to the MFP 110. The post-processing unit 152 performs post-processing steps such as punching, trimming of paper edge portions, and bookbinding. The operation unit 130 displays an instruction to the user and the state of the MFP 110. The scanner 132 has an auto document feeder and can continuously read a plurality of documents. The scanner 132 irradiates a bundle or one original with a light source (not shown), forms a reflection image of the original on a solid-state image sensor such as a CCD sensor with a lens, and outputs a raster-like image reading signal from the solid-state image sensor. Is obtained as image data. The input unit 131 is an interface including a key input and a touch panel for receiving an input from the user. The inspection device 160 inspects the printed matter by reading the printed matter printed by the MFP 110 and comparing it with the original image data.

  FIG. 2 is a block diagram illustrating a configuration of the inspection device 160 according to the embodiment.

  The inspection device 160 includes an image reader 202, an image reader control unit 204, an external I / F 205, a comparison determination control unit 206, and an HDD 207. The image reader 202 reads an image printed on a printed material that has been printed and conveyed by the MFP 110. The image reader control unit 204 controls the image reader 202. The external I / F 205 is an interface connected to the PC 101 and the MFP 110, receives the rendered developed image data stored in the HDD 143 of the MFP 110 and stores it in the HDD 207. The comparison determination control unit 206 compares the image data of the printed matter obtained from the image reader control unit 204 with the image data received from the MFP 110 stored in the HDD 207, and determines whether there is a defect in the printed image. The comparison determination control unit 206 has a CPU, ROM, RAM, and the like (not shown), and is realized by a hardware logic circuit or the like even when the CPU executes a program stored in the ROM. It may be configured.

  FIG. 3 is a block diagram illustrating a configuration of the image processing unit 119 according to the embodiment.

  Image data input to the image processing unit 119 (color system) is roughly classified into RGB data that handles data from the scanner 132 such as a copying operation, and YMCK data that handles data from the hard renderer 117 such as a network print operation. it can. The RGB system data is input to the background removal unit 301, and the YMCK system data is input to the output gamma correction unit 303. The background removal unit 301 performs nonlinear conversion on the RGB image data read by the scanner 132 based on the detected image area data to remove the background portion. The output direct mapping unit 302 converts the RGB image data from which the background has been removed by the background removal unit 301 into YMCK image data. In this conversion, the output direct mapping unit 302 inputs RGB values into a lookup table and creates a Y (yellow) component from the sum of the output values. Similarly, the output direct mapping unit 302 generates each component of M (magenta), C (cyan), and K (black) by a lookup table and its addition operation. At this time, the output direct mapping unit 302 uses a three-dimensional lookup table based on the image area data detected by the scanner 132. The output direct mapping unit 302 applies different types of lookup tables for the character area and the photo area.

  The output gamma correction unit 303 performs density correction corresponding to the printer engine 151 on the YMCK system data output from the output direct mapping unit 302 or the hard renderer 117. The output gamma correction unit 303 uses a one-dimensional lookup table for each of YMCK and plays a role of maintaining the linearity of output image data that differs for each image formation. The result of color calibration is stored in this lookup table. Reflected. The video data counting unit 304 converts the video data output from the output gamma correction unit 303 into the number of dots suitable for the output resolution for each of the Y, M, C, and K planes, and counts how many dots are obtained. . The halftone processing unit 307 selectively applies different types of screening to the image data output from the video data counting unit 304 according to the function of the MFP 110.

  Generally, an error diffusion system screening that does not easily cause moiré is used in a copying operation and the like, and a multi-value screen system screening using a dither matrix is often used in a printing operation in consideration of reproducibility of characters and fine lines. The former is a method in which the target pixel and its surrounding pixels are weighted with an error filter, and multilevel errors are distributed and corrected while maintaining the number of gradations. The error diffusion processing unit 305 executes the former. . On the other hand, the latter is a method of setting the dither matrix threshold value to a multi-value, expressing halftones in a pseudo manner, converting YMCK independently, and switching between low and high line numbers according to the input image data and reproducing them. A multi-value screen unit 306. The smoothing processing unit 308 detects the edge portion of each YMCK component of the image data output from the halftone processing unit 307 by pattern matching. Then, smoothing processing for reducing jaggies is performed by converting the edge portion into a pattern that is reproduced more smoothly. Then, the smoothing processing unit 308 outputs the image data after the smoothing process to the printer engine 151 to form an image.

  FIG. 4 is a flowchart for explaining processing by the inspection device 160 according to the embodiment of the present invention.

  First, in step S <b> 401, the printed material conveyed from the MFP 110 to the inspection device 160 is read by the image reader 202. In step S <b> 402, the rendered image data (reference image) stored in the HDD 143 of the MFP 110 stored in the HDD 207 by the comparison determination control unit 206, the image data read by the image reader 202, and the like. Compare In S403, it is determined whether or not the degree of mismatch exceeds a level for determining that the print image is defective. If not, the process proceeds to S407, and the number of pages of the print job and the number of inspected pages are determined. The processing from S401 is repeated until the final page is compared. On the other hand, if it is determined in the comparison determination in S403 that the level is exceeded, it is determined that the printed image is defective, and the process proceeds to S404 to update the error log information. In step S405, the printed matter determined to be NG is discharged to another path, and in step S406, the MFP 110 is instructed to stop paper feeding and printing processing. Note that the error log information is log information in which error information resulting from the contamination of an image that has occurred in the past is stored together with the state of the contamination.

  FIG. 8 is a flowchart for explaining processing of the inspection apparatus 160 during a period until the paper feeding and printing are completely stopped after issuing the paper feeding and printing stop instruction to the MFP 110 in S406 of FIG.

  First, in S801, it is determined whether or not the operation of the transport unit that transports the sheet to the inspection device 160 has stopped. If stopped, the process is terminated. If not stopped, the inspection process from S802 to S807 is continued. In step S <b> 802, the printed material conveyed from the MFP 110 to the inspection device 160 is read by the image reader 202. In step S <b> 803, the comparison determination control unit 206 compares the image data (reference image) stored in the HDD 207 with the image data read by the image reader 202. In step S804, it is determined whether or not the degree of mismatch exceeds a level for determining that the print image is defective. If not, the process proceeds to step S801. On the other hand, if it is determined that the level exceeds the level in the comparison determination in S804, the image of the printed matter is determined to be defective, and the process proceeds to S805. The image is compared with an image that has been previously determined to be defective, and error log information is determined in S806. To update. In step S807, the second and subsequent sheets are discharged to another path. The detection processing from S802 to S807 described above is continuously executed until there is no sheet fed to the inspection apparatus 160.

  Hereinafter, with reference to FIGS. 5 and 6, the relationship between the processing shown in the flowcharts of FIGS. 4 and 8, the processing of the MFP 110 according to the present embodiment, and the image printed on the paper will be described.

  FIG. 5 shows a path through which the control modules of the two independent systems of the MFP 110 according to the embodiment receive a stop command from the inspection device 160 and transmit the command to the end module. FIG. Each module is a software task that the CPU 113 operates in accordance with a program stored in the ROM 140, and is not depicted in the hardware components illustrated in FIG.

  FIG. 6 illustrates a time axis indicating a defective image printed on a sheet when the image forming system is stopped first, among the two independent control modules of the paper feeding system and the image forming system of the MFP 110 according to the embodiment. It is the figure shown with.

  In FIG. 6, an elliptical stain (bd_img_61) occurs in the vicinity of the character “D” printed on the sheet of NG61_pg, and it is determined that this stain has exceeded the level determined as a failure in S403 of FIG. Thereafter, the stop command issued in S406 in FIG. 4 is issued from the inspection device 160 to the MFP 110 at the timing T1 in FIG. Next, in step 502 in FIG. 5, the MFP 110 transmits a stop command to the host I / F control task 503, the drawing development control task 506, and the engine control task 509 performed by the controller 112. The host I / F control 503 instructs the print data reception task 504 so that the network I / F 111 does not accept any more print data from the PC 101. As a result, data reception is stopped at 505 in FIG.

  When the drawing development control task 506 transmits a stop command to the RIP task 507, an interrupt is generated in the hard renderer 117, and the operation stops. Thereafter, in 508, the drawing data expanded in the page memory of the RAM 141 is cleared.

  Further, when the engine control task 509 transmits a stop command to the paper feed system control task 510, the paper feed from the paper feed unit 150 is stopped at 511. Further, when the engine control task 509 transmits a stop command to the paper discharge system control task 512, a command is sent to the post-processing unit 152 so that the paper that is NG in the inspection is sent to a paper discharge path different from the normal deliverable. Then, at 513, the paper discharge path is changed.

  If the same problem occurs as in NG61_pg and NG62_pg in FIG. 6, it is determined that the image is similar and the past log information is updated in S804 in FIG.

  In FIG. 6, it is assumed that paper has already been fed to the printer engine 151 up to NG64_pg even when a failure is detected in NG61_pg and a print stop command is issued to the MFP 110. Sheets output from timing T3 to T6 are newly fed during a time lag from when the engine control task 509 receives a stop command until the processing is transmitted to the sheet feed system control task 510. It is paper.

  In this embodiment, even when additional paper is fed after NG65_pg, the inspection processing is continued if it is determined in S801 in FIG. 8 that the paper feeding to the inspection device 160 has not been completely stopped yet. That is, the detection processing from S802 to S805 in FIG. 8 is also performed for paper output from NG65_pg to NG67_pg and from timing T5 to T6.

  Further, if it is determined that none of the defective images generated in the past is the same as NG63_pg, NG64_pg, or NG65_pg, it is registered as new NG image data in S804 of FIG. In NG66_pg and NG67_pg, the image forming system task stopped first, so that the print image is normally expanded until the middle of the page, but reading of image data from the page memory in the RAM 141 is interrupted, so white It is missing. Further, after timing T5, although the reading of the image data from the RAM 141 is stopped, the sheet feeding system is still in operation, so that the sheet is transported idle and a blank page is output. At timing T6, the sheet conveyance is the last, and the operation of the post-processing system unit 152 is stopped.

  As described above, when the image forming system is stopped first, a sheet for which printing has been completed or an all-white sheet is discharged from the MFP 110 and supplied to the inspection device 160, and these sheets are also received by the inspection device 160. Will be inspected.

  FIG. 7 shows a time axis representing a defective image printed on a sheet when the paper feed system is stopped first, among the two independent control modules of the paper feed system and the image forming system of the MFP 110 according to the embodiment. It is a figure demonstrated with it.

  FIG. 7 shows a case where an elliptical stain is generated in the vicinity of the character “C” of NG71_pg, and it is determined in S403 in FIG. If it is determined in S403 to be defective, in S406, the inspection apparatus 160 issues a print stop command to the MFP 110 at timing T7 in FIG. As a result, the MFP 110 transmits a stop command to the host I / F control task 503, the drawing development control task 506, and the engine control task 509 in the controller 112 in 502 of FIG. The host I / F control 503 instructs the print data reception task 504 so that the network I / F 111 does not accept any more print data from the PC 101. As a result, data reception is stopped at 505 in FIG.

  When the drawing development control task 506 transmits a stop command to the RIP task 507, an interrupt is generated in the hard renderer 117, and the operation stops. Thereafter, in 508 of FIG. 5, the drawing data developed in the page memory of the RAM 141 is cleared.

  Further, when the engine control task 509 transmits a stop command to the paper feed system control task 510, the paper feed from the paper feed unit 150 is stopped at 511. When the engine control task 509 transmits a stop command to the paper discharge system control task 512, a command is sent to the post-processing unit 152 so that the paper that is NG in the inspection is sent to a paper discharge path different from the normal deliverable. In step 513 in FIG. 5, the paper discharge path is changed.

  When the same defective image occurs like NG71_pg and NG72_pg in FIG. 7, it is determined as a similar defective image, and the past log information is updated in S804 in FIG.

  In FIG. 7, when a failure is detected in NG71_pg and a print stop command is issued to the MFP 110, it is assumed that paper has already been supplied up to NG73_pg. The paper output from timing T8 to T9 is newly supplied paper during the time lag from when the engine control task 509 receives a stop command until the processing is transmitted to the paper feed system control task 510. It is.

  In this embodiment, even when additional paper is fed after NG74_pg, it is determined in S801 in FIG. 8 that the conveyance of the sheet to the inspection device 160 has not been completely stopped yet. Then, the detection processing from S802 to S805 in FIG. 8 is also performed on the paper discharged from timing T8 to T9. In FIG. 7, since the paper feed system control task 510 stops before the image forming system task, the paper post-processing system unit 152 stops at timing T9, and the entire surface is blank paper as shown in FIG. Is not discharged.

  In this way, when the paper feed system stops before the image forming system, paper that has been printed halfway or all white paper is not ejected from the MFP 110, but only after the stop command is received. The paper printed with the time lag is inspected by the inspection device 160.

<Other embodiments>
In the previous embodiment, of the two independent systems of the paper feeding system and the image forming system, the log information is updated as the same defective image in the inspection apparatus even for the defective image when the image forming system stops first. I was going. However, since it is known in advance that a white-out image where the image is interrupted is not caused by dirt or the like, it can be managed as log information different from log information caused by dirt or the like of the image. Is possible.

  FIG. 9 is a flowchart for explaining processing by the inspection apparatus according to another embodiment.

  The processes in and after S902 are repeated until the paper feeding to the inspection apparatus 160 is stopped in S901. The product formed in step S902 is read by the image reader 202, and is compared with a reference image in step S903. When it is recognized that the number of dots of the image for one page of the product read by the inspection device 160 in S904 is equal to or larger than the number of dots counted by the video data counting unit 304, the log information is displayed as the image dirt in S905. Update.

  On the other hand, if it is determined in S904 that the number of dots in the image for one page of the product read by the inspection device 160 is less than the number of dots counted by the video data counting unit 304, the above-described white image has occurred. As a result, the process proceeds to S906. In S906, since the image defect in this case is different from the dirt, it is updated as log information different from the log information of the dirt of the image. The printed matter that has been processed in S905 and S906 is discharged to another path in S907. Thereafter, as in FIG. 8, the processing from S902 is repeated until the paper conveyance is stopped in S901.

(Other examples)
The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, etc.) of the system or apparatus reads the program. It is a process to be executed.

  As described above, according to the present embodiment, when a printing defect is detected by an inspection apparatus that receives and inspects a printed matter printed by a printing apparatus, paper feeding processing to the printing apparatus and printing processing by the printing apparatus are stopped. . At this time, not only the paper that has already been fed and printed and staying in the printing apparatus, but also the newly added paper is inspected, thereby reducing the amount of discarded printed matter.

  In addition, according to the present embodiment, the failure part of the printing apparatus, such as whether a similar defect has occurred by leaving the type of defect as log information and comparing it with a past defective image in the cause analysis of the defect of the printing apparatus. Can help to identify

Claims (5)

An inspection device that receives and inspects printed matter printed by a printing device,
Detecting means for detecting defects of the printed matter by reading the printed matter and comparing it with the original image data;
Storage means for storing, as log information, information indicating defects of the printed matter detected by the detection means;
Issuance means for issuing a stop instruction to stop feeding and printing in the printing apparatus when a defect is detected by the detection means;
The detection means for the printed matter fed by the printing apparatus after the stop instruction is issued by the issuing means and before the feeding by the printing apparatus is stopped by the stop instruction. have a, and control means for controlling to execute continuously the detection process by,
The storage means stores the printed matter fed by the printing apparatus after the stop instruction is issued by the issuing means and before the feeding by the printing apparatus is stopped by the stop instruction. On the other hand, log information regarding the white spot image detected by the detection unit when the detection process by the detection unit is continuously executed is displayed by the detection unit before the stop command is issued by the issue unit. An inspection apparatus that stores log information different from information indicating a detected defect of a printed matter . The inspection apparatus according to claim 1, further comprising a discharge unit that discharges the printed matter detected as defective by the detecting unit to a path different from that of the normal printed matter. A printing system having a printing device and an inspection device that receives and inspects printed matter printed by the printing device,
The inspection device is:
Detecting means for detecting a defect of the printed matter by reading the printed matter conveyed from the printing apparatus and comparing it with the original image data;
Storage means for storing, as log information, information indicating defects of the printed matter detected by the detection means;
Issuance means for issuing a stop instruction to stop feeding and printing in the printing apparatus when a defect is detected by the detection means;
The detection means for the printed matter fed by the printing apparatus after the stop instruction is issued by the issuing means and before the feeding by the printing apparatus is stopped by the stop instruction. Control means for controlling to continuously execute the detection process by
The storage means stores the printed matter fed by the printing apparatus after the stop instruction is issued by the issuing means and before the feeding by the printing apparatus is stopped by the stop instruction. On the other hand, log information regarding the white spot image detected by the detection unit when the detection process by the detection unit is continuously executed is displayed by the detection unit before the stop command is issued by the issue unit. Store it as log information different from the information indicating the detected print defect,
The printing system, wherein the printing apparatus conveys the printed matter and the fed paper from the stop command to when the printing process and the paper feeding process are stopped. The printing system according to claim 3 , wherein the inspection apparatus further includes a paper discharge unit that discharges the printed matter detected as defective by the detection unit to a path different from a normal printed matter. A control method for controlling an inspection device that receives and inspects printed matter printed by a printing device,
A detecting step for detecting a defect of the printed matter by reading the printed matter and comparing it with the original image data;
A storage step of storing, as log information, information indicating a defect of the printed matter detected by the detection unit;
An issuing step for issuing a stop command to stop feeding and printing in the printing apparatus when the issuing means detects a defect in the detecting step;
The control means applies the printed matter fed by the printing device after the stop command is issued in the issuing step and before the feeding by the printing device is stopped by the stop command. have a, and a control step of controlling to execute continuously the detection process by the detection step Te,
In the storing step, after the stop command is issued in the issuing step, and before the paper feeding in the printing device is stopped by the stop command, the printed material fed by the printing device On the other hand, log information relating to the white spot image detected in the detection step when the detection process in the detection step is continuously executed is detected in the detection step before the stop command is issued in the issue step. A method for controlling an inspection apparatus, characterized in that the inspection information is stored as log information different from information indicating a detected defective printed matter .

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