JP6439587B2 - Image forming apparatus and program - Google Patents

Description

  The present invention relates to an image forming apparatus and a program.

  Examples of the image forming apparatus include a printer device, a copying machine, a printing machine, and a multifunction machine. This type of image forming apparatus is used alone or connected to a terminal device via a communication line. In a printing system (image forming system) configured by connecting an image forming device and a terminal device via a communication line, print data (image data) transmitted from the terminal device is transferred to the image forming device via the communication line. Is received, and an image is formed (printed) based on the received print data.

  By the way, while the image forming apparatus is receiving print data, communication may be cut off, or transmission of print data may be canceled by the user. In such a case, when the print data is retransmitted after that, the received print data and the retransmitted print data are collated, and if the data is the same, reception of the print data is resumed from the middle of the reception. There has been proposed an image forming apparatus that restarts printing processing using received print data (see, for example, Patent Document 1).

JP 2014-76547 A

  As the print data transmission cancellation, for example, there is a case where the user cancels transmission of print data (job cancellation) because the setting value of the post-processing setting is incorrect. In this case, the user corrects the set value and retransmits the print data with the correct set value. As described above, when print data is retransmitted due to job cancellation due to a setting error or the like, the contents of the received print data and the retransmitted print data are different. For this reason, in the prior art described in Patent Document 1, it is determined that the received print data and the retransmitted print data are different from each other, and the print data is received from the beginning. It takes time to resume (image formation).

  Therefore, according to the present invention, it is possible to resume printing (image formation) quickly even when a job cancellation occurs during reception of print data due to an incorrect setting value, and the print data is retransmitted with a correct setting value. An object of the present invention is to provide an image forming apparatus and a program.

In order to achieve the above object, an image forming apparatus of the present invention includes:
A page data generator that generates raster image processed page data from the received print data;
A storage unit that stores print data being received and page data generated by the page data generation unit when a reception interruption occurs during reception of the print data;
When new print data is received, a collation unit that collates the sameness between the print data stored in the storage unit and the new print data and determines that the parts that are not related to raster image processing are the same. When,
A controller that discards new print data up to the location of the print data stored in the storage unit and reads the page data stored in the storage unit and starts printing when it is determined that the collation unit is the same;
It is characterized by providing.

The program of the present invention is
In the image forming apparatus,
Processing to generate raster image processed page data from the received print data;
A process of saving print data being received and generated page data in a storage unit when reception interruption occurs during reception of print data;
A process of collating the sameness between the print data stored in the storage unit and the new print data when new print data is received, and determining that the parts that are not related to raster image processing are different. ,
If determined to be the same, discarding new print data up to the location of the print data stored in the storage unit, reading page data stored in the storage unit, and starting printing;
Is executed by a computer.

  In the image forming apparatus or program configured as described above, when the print data stored in the storage unit and the reprinted print data are collated, it is determined that the portions that are not related to the raster image processing are the same, that is, new Print data is regarded as the same data as received print data. Then, by discarding new print data up to the received print data location stored in the storage unit, page data generation up to the received print data location is not performed for the new print data, For the subsequent portions, page data is read from the storage unit and printing processing is performed.

  According to the present invention, even when a job cancellation occurs during reception due to an incorrect setting value or the like, and the print data is retransmitted with the correct setting value after that, the print processing is performed with the same data as the received print data. Therefore, printing can be resumed quickly.

1 is a schematic configuration diagram showing an example of a configuration of a printing system (image forming system) having an image forming apparatus of the present invention. FIG. 10 is a diagram illustrating an example of a difference between received print data and retransmitted print data. 2 is a functional block diagram illustrating an example of a configuration of a functional unit of the image forming apparatus according to the embodiment of the present disclosure. FIG. 1 is a block diagram illustrating an example of a hardware configuration of each unit of an image forming apparatus according to an embodiment of the present disclosure. FIG. 6 is a diagram illustrating an example of a description of a head portion of print data. 4 is a flowchart illustrating a basic processing flow from reception of print data to print output (image formation). 6 is a flowchart illustrating a flow of processing according to the first exemplary embodiment regarding processing for determining the identity of print data. It is a flowchart which shows the flow of a specific process of a PJL part. It is a flowchart which shows the flow of a specific process of a PDL part. FIG. 7 is a diagram illustrating received print data with duplex printing = OFF and staple = OFF, and re-received print data with duplex printing = ON and staple = ON. FIG. 6 is a diagram illustrating received print data used for data comparison between received print data and re-received print data that have a difference in raster data. FIG. 10 is a diagram illustrating re-received print data used for data comparison between received print data and re-received print data having a difference in raster data. FIG. 10 is a diagram illustrating received print data and re-received print data in the case of the second embodiment.

  Hereinafter, modes for carrying out the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the drawings. Further, the present invention is not limited to the embodiment. In the following description and each drawing, the same reference numerals are used for the same elements or elements having the same functions, and duplicate descriptions are omitted.

[Printing system]
FIG. 1 is a schematic configuration diagram showing an example of a configuration of a printing system (image forming system) having an image forming apparatus of the present invention.

  As shown in FIG. 1, the printing system 1 according to this example includes an image forming apparatus 10 of the present invention and a client PC (personal computer) 20 as an example of a terminal device via a communication line 30 such as a network. It is a connected configuration. The client PC 20 transmits print data (image data) to the image forming apparatus 10. The image forming apparatus 10 receives print data transmitted by the client PC 20 via the communication line 30 and performs printing (image formation) based on the received print data.

  In FIG. 1, the communication line 30 between the image forming apparatus 10 and the client PC 20 is illustrated as a wire, but it is needless to say that the communication line 30 may be wireless. In this configuration example, the image forming apparatus 10 and the client PC 20 are configured. However, the configuration is not limited thereto. That is, a configuration in which the image forming apparatus 10 includes a plurality of units, a configuration in which the client PC 20 includes a plurality of units, or a configuration in which the image forming apparatus 10 and the client PC 20 each include a plurality of units may be employed. Further, the terminal device is not limited to the client PC 20.

  In the printing system 1 having the above-described configuration, while the image forming apparatus 10 is receiving print data transmitted by the client PC 20, communication may be interrupted due to some trouble or the transmission of print data may be canceled by the user. As the print data transmission cancellation, there is a case where the user cancels transmission of print data (job cancellation) because the setting value of the print setting such as post-processing setting is wrong, for example. Here, examples of “post-processing” include stapling (punching), punching, folding function, and the like.

  In the client PC 20, for example, when the job is canceled due to an error in the setting value, the user corrects the incorrect setting value and retransmits the print data with the correct setting value. FIG. 2 shows an example of a difference between received print data and retransmitted print data. In FIG. 2, the left data is received print data, and the right data is retransmitted print data. The print data is composed of a PJL (Print Job Language) portion and a PDL (Page Description Language) portion that follows. The PJL part is a command language for printing that controls the image forming apparatus 10, and the PDL part is a page description language.

  As an example, the data “@PJL SET STAPLE = OFF” is described in the PJL part of the received print data, and the data “Creation Time: 2015/3/16 15: 30: 15.20” is described in the PDL part. It is assumed that Then, after receiving the data “Creation Time: 2015/3/16 15: 30: 15.20”, it is assumed that the job is canceled due to an incorrect setting value or the like. In this case, data up to “Creation Time: 2015/3/16 15: 30: 15.20” has been received, and after that, no data has been received. It is assumed that the print data is retransmitted with the correct setting value after the job cancellation occurs. At this time, in the reprinted print data, the data in which the post-processing setting of the PJL part is “@PJL SET STAPLE = ON” is corrected, and the creation date and time of the PDL part is “Creation Time: 2015/3/16 15:32: It is assumed that the data has been changed to “11.5”.

  Then, when the received print data and the retransmitted print data are collated, in the case of the print data description example shown in FIG. 2, the contents of the PJL part post-processing setting data and the PDL part creation date and time data Is different. Therefore, in the prior art described in Patent Document 1, it is determined that the collation result is handled as different data, that is, the retransmitted print data is different from the received print data, and the print data is received from the beginning. . As a result, it takes time to resume printing (image formation).

  Also, not only in the case of explicit retransmission by the user such as setting mistakes in setting values of post-processing settings, but when the user sending print data is different, or when the terminal device sending print data is changed, When it is difficult to determine communication restart, it is necessary to receive print data from the beginning.

[Configuration of Functional Unit of Image Forming Apparatus]
When the print data is retransmitted with a correct set value after the job cancellation occurs, the image forming apparatus 10 of the present invention can quickly print (image formation) when collating the received print data with the retransmitted print data. ) Can be resumed, each functional unit shown in FIG. 3 is provided. FIG. 3 is a functional block diagram showing an example of the configuration of the functional unit of the image forming apparatus according to the embodiment of the present invention.

  As illustrated in FIG. 3, the image forming apparatus 10 according to an embodiment of the present disclosure includes a receiving unit 11, a page data generation unit 12, a storage unit 13, a collation unit 14, and a control unit 15. It has become.

  The receiving unit 11 receives print data transmitted from the client PC 20. The page data generation unit 12 generates page data subjected to raster image processing from the print data received by the reception unit 11. “Raster image processing” is processing that prints the print data generated by the client PC 20 so that it can be printed by the image forming apparatus 10. Hereinafter, raster image processing may be referred to as RIP (Raster Image Processor), and page data that has undergone raster image processing may be referred to as RIP-completed page data or raster data.

  The storage unit 13 stores the print data being received and the RIP-completed page data generated by the page data generation unit 12 under the control of the control unit 15 when reception interruption occurs during reception of the print data. . The reception interruption of the print data can be detected by, for example, the control unit 15 monitoring the reception state of the reception unit 11. The collation unit 14 collates the sameness between the print data stored in the storage unit 13 and the new print data when new print data is received after the job cancellation. At the time of this collation, the collation unit 14 determines that the portions that are not related to RIP (raster image processing) are the same even if they are different.

  When the collation result of the collation unit 14 is the same, that is, when the print data stored in the storage unit 13 and the new print data are the same, the control unit 15 determines the location of the print data stored in the storage unit 13. Until new print data is discarded. The process of discarding the print data can be realized by the control unit 15 controlling the reception unit 11, for example. The control unit 15 further performs processing for reading page data stored in the storage unit 13 and starting printing.

  In the image forming apparatus 10 provided with each of the functional units (11 to 15) described above, when the print data stored in the storage unit 13 and the retransmitted print data are collated, the portions not related to the RIP are different. A process is performed in which it is determined that they are the same, that is, the new print data is regarded as the same data as the received print data. Then, by discarding new print data stored in the storage unit 13 up to the received print data, page data up to the received print data is not generated for the new print data. For the subsequent portions, printing processing (reprinting processing) is performed by reading page data from the storage unit 13.

  As a result, even if a job cancellation occurs during reception due to an incorrect setting value, etc., and the print data is then retransmitted with the correct setting value, reprint processing is performed assuming that the received print data is the same data. Therefore, printing can be resumed quickly. A specific embodiment for realizing the above processing will be described later.

[Hardware Configuration of Each Part of Image Forming Apparatus]
Next, the hardware configuration of each unit of the image forming apparatus 10 will be described with reference to FIG. FIG. 4 is a block diagram illustrating an example of a hardware configuration of each unit of the image forming apparatus according to the embodiment of the present disclosure. Here, the case where it applies to a printer apparatus is mentioned as an example.

  As illustrated in FIG. 4, the image forming apparatus 10 includes the storage unit 13 and the control unit 15 illustrated in FIG. 3. The storage unit 13 is composed of, for example, an HDD (Hard Disk Drive). The storage unit 13 stores (stores) print data, RIP-completed page data, an ICC (International Color Consortium) profile, and the like received from the client PC 20.

  The control unit 15 is used as, for example, a CPU (Central Processing Unit) 151, a ROM (Read Only Memory) 152 for storing print processing executed by the CPU 151, other processing programs, and the like, and a work area of the CPU 151. And a RAM (Random Access Memory) 153. The CPU 151 reads programs and data from the ROM 152 and RAM 153 and controls the entire image forming apparatus 10.

  In addition to the storage unit 13 and the control unit 15, the image forming apparatus 10 includes a communication I / F (interface) unit 41, an image reading unit 42, an image processing unit 43, an image forming unit 44, a paper feeding unit 45, and a fixing unit 46. And an operation display unit 47. The control unit 15 includes a storage unit 13, a communication I / F unit 41, an image reading unit 42, an image processing unit 43, an image forming unit 44, a paper feeding unit 45, a fixing unit 46, an operation display unit 47, and a system bus 48. Connected through.

  The communication I / F unit 41 functions as the receiving unit 11 in FIG. 3 and receives print data from the client PC 20 via the communication line 30. The image reading unit 42 reads an image of a document and A / D converts the read image signal to generate image data. The image processing unit 43 performs processing such as shading correction, dither processing, and compression on the A / D converted image data, and stores the processed image data in the RAM 153.

  The image forming unit 44 is a print output unit that prints (image forms) RIP-completed page data generated from print data by a processing program and outputs the data. The image forming unit 44 is composed of four image forming units corresponding to each color, for example, to form toner images of each color of yellow (Y), magenta (M), cyan (C), and black (K). Yes. Each of the four image forming units includes a drum-shaped photoconductor, a charging unit, an exposure unit, and a development unit arranged around the photoconductor.

  The paper feed unit 45 feeds the paper stored in a paper storage unit (not shown) to the image forming unit 44. More specifically, the paper feed unit 45 feeds paper to a paper transport unit (not shown) that transports the paper to the image forming unit 44. The fixing unit 46 fixes the toner image formed on the paper by the image forming unit 44.

  The operation display unit 47 is a touch panel including a flat panel display such as a liquid crystal display (LCD) or an organic EL (Electro Luminescence) display. The operation display unit 47 displays an instruction menu for the user and information such as print settings relating to the acquired image data, and the user inputs information such as print settings and performs a job operation.

  When the image forming apparatus 10 configured as described above receives the print data transmitted from the client PC 20 by the communication I / F unit 41, the image forming apparatus 10 stores the print data in the storage unit 13 while generating the actual page data. I do. Specifically, the print setting and RIP setting are analyzed from the received print data and read to generate page data. Here, the print settings are post-processing settings such as stapling (punching), punching, and folding functions. The RIP settings include color conversion settings and fine line processing.

  Here, the print data will be described more specifically. The print data is composed of two parts: a PJL part in which print settings are described and a PDL part that is analyzed by an interpreter and generates page data. The following information is stored in the PJL part and the PDL part, respectively.

(PJL part)
Job information such as print data name, user name, and job identification ID.
-Post-processing settings such as stapling, punching and folding.
-RIP settings such as RIP output color settings and ICC profile settings.

(PDL part)
Job information such as print data name, user name, and job identification ID.
-Post-processing settings such as stapling, punching and folding.
-RIP settings such as RIP output color settings and ICC profile settings.
-Rasterization data for generating actual page data.

  As described above, job information, post-processing settings, and RIP settings are stored in both the PJL part and the PDL part, but basically the same setting values are stored. Also, depending on the system, there is a system that can specify which process is to be prioritized when different settings exist in the PJL part and the PDL part.

  FIG. 5 shows an example of the description of the head portion of the print data. The print data in this example includes a PJL portion starting from “% -12345X @ PJL” and a PDL portion starting from “%! PS-Adobe (registered trademark) -3.0”. For example, in the PJL part, "@PJL SET DRIVERJOBID =" ACDE4806956C04250103100706 "" is a job identification ID, "@PJL SET USERNAME =" xxxxxx "" is a user name, and "@PJL SET JOBNAME =" yyyyyy "" Is the job name. In FIG. 5, the number at the left end represents the number of rows shown for convenience, and the same applies to other drawings.

[Basic processing from print data reception to print output]
Next, basic processing from reception of print data to print output (image formation), which is executed in the image forming apparatus 10 according to the present embodiment, will be described with reference to FIG. FIG. 6 is a flowchart showing a basic processing flow from reception of print data to print output (image formation). This process is executed under the control of the CPU 151 (see FIG. 4) of the control unit 15.

  In the printing system 1 of FIG. 1, when a user issues a print instruction on the client PC 20, print data is divided from the client PC 20 to the image forming apparatus 10 according to a network protocol and transmitted in units of packets. Therefore, the processing described below is basically executed on a packet basis.

  In the image forming apparatus 10, when the communication I / F unit 41 receives print data (step S1), the CPU 151 analyzes the print data divided according to the network protocol (step S2), and determines whether the print data is PJL. It is determined whether or not (step S3). For example, if the received print data starts with “% -12345X @ PJL”, the CPU 151 determines that the print data is PJL (YES in S3), and print information, post-processing information, and RIP settings from the subsequent character string are printed. It is determined whether it is set as a setting, and the determined setting value is stored in the storage unit 13 as setting information. Specifically, the CPU 151 analyzes the character string of the PJL (step S4), then analyzes the print settings (step S5), saves the analyzed print settings in the storage unit 3 (step S6), and receives them thereafter. The processing from step S1 to step S6 is repeated until the content of the packet thus obtained becomes PDL.

  When detecting that the content of the received packet is, for example, “%! PS-Adobe (registered trademark) -3.0”, the CPU 151 determines that the subsequent data is PDL data (PDL data) (NO in S3). ), PDL data is stored in the storage unit 13 (step S7). The CPU 151 further analyzes the contents of the PDL data (step S8), and then determines whether the data is rasterization data (step S9). Specifically, for example, in the case of Postscript (registered trademark), the CPU 151 determines whether a PS (Postscript) command in which print settings are described or a rasterization data portion in which a rendering command for rasterizing is described. to decide.

  Next, if the content of the PDL data is a PS command in which print settings are described (NO in S9), the CPU 151 analyzes the print settings (step S10), and stores the analyzed print settings in the storage unit 13. Save (step S11), then move to step S1, and thereafter perform the same processing.

  If the content of the PDL data is rasterization data in which a drawing command is described (YES in S9), the CPU 151 performs rasterization processing of page data (step S12), and then rasterization processing for one page is performed. It is determined whether or not it has been completed (step S13). When the rasterization process for one page is completed (YES in S13), the CPU 151 stores the page data in the storage unit 13 (step S14), and then transmits the page data to the image forming unit 44 (step S15) for printing (step S15). Image formation) is performed (step S16).

  Next, the CPU 151 determines whether or not all page printing has been completed (step S17). When all page printing has been completed (YES in S17), the CPU 151 determines that it is not necessary to reuse and saves it in the storage unit 13. The deleted data is deleted (step S18), and a series of processes from reception of print data to print output is terminated. If the CPU 151 determines in step S13 that the rasterizing process for one page has not been completed (NO) and if it is determined in step S17 that printing of all pages has not been completed (NO), the CPU 151 returns to step S1. The above process is repeatedly executed.

  Next, the print data identity that is executed in the image forming apparatus 10 according to the present embodiment when a job cancellation occurs during reception due to an incorrect setting value, and then the print data is retransmitted with the correct setting value. A specific embodiment relating to the determination process will be described. The processing of each embodiment described below is executed under the control of the CPU 151 of the control unit 15.

[Example 1]
FIG. 7 is a flowchart showing the flow of processing according to the first embodiment relating to print data identity determination processing.

  When the communication I / F unit 41 receives print data (step S21), the CPU 151 checks whether or not the received print data holds reception stop data (data instructing reception stop) (step S22). ). If the CPU 151 determines that the received print data does not hold the reception stop data (NO in S22), the CPU 151 does not perform the subsequent print data identity determination process, and proceeds to step S23 to perform normal processing. Perform the printing process. The normal printing process in step S23 is a process according to the flowchart of FIG.

  When the CPU 151 determines that the received print data holds the reception stop data (YES in S22), the CPU 151 determines whether the received print data is a PJL portion (step S24). When the CPU 151 determines that the received print data is the PJL part (YES in S24), the CPU 151 performs the process of the PJL part (step S25). Specifically, in the processing of the PJL portion, as shown in the flowchart of FIG. 8, the CPU 151 analyzes the PJL (step S31), and then prints print settings such as print information, post-processing settings, and RIP settings in the storage unit 13. Save (step S32) and analyze the print data of the next packet.

  If the CPU 151 determines that the received print data is a PDL portion (NO in S24), the CPU 151 performs processing of the PDL portion (step S26). Specific processing of the PDL portion will be described later. When the processing of the PDL portion is completed, the CPU 151 transmits page data to the image forming unit 44 (step S27) and performs printing (image formation) (step S28). Next, the CPU 151 determines whether or not all page printing has been completed (step S29). When all page printing has been completed (YES in S29), it is determined that there is no need to reuse and the data is stored in the storage unit 13. The data is deleted (step S30), and the series of processing ends.

  Next, specific processing of the PDL part will be described with reference to FIG. FIG. 9 is a flowchart showing a specific processing flow of the PDL portion.

  The CPU 151 analyzes the PDL data (step S41), and then determines whether the PDL data is a command related to print settings (step S42). If it is determined that the command is related to print settings (YES in S42), the CPU 151 analyzes the print settings (step S43), then reads the saved print settings (step S44), and then print information and post-processing settings, Print settings such as RIP settings are stored in the storage unit 13 (step S45). At this time, if the print settings specified in the PJL portion and the PDL portion are different, the user may be allowed to specify in advance so that either one is given priority.

  If the CPU 151 determines that the PDL data is the raster data portion in step S42 (NO), the CPU 151 compares the reception cancellation data with the raster data portion to determine whether the raster data portion is the same as the reception cancellation data. Is determined (step S46). If the CPU 151 determines that the raster data portion is not the same as the reception stop data (NO in S46), the CPU 151 proceeds to step S23 in FIG. 7, and thereafter performs rasterization using the newly received data, and performs normal printing. Process.

  If the CPU 151 determines in step S46 that the raster data portion is the same as the reception stop data (YES in S46), it reads the print information of the print data being printed (step S47). Then, the CPU 151 determines whether or not the RIP settings are the same by comparing the print settings of the print data being printed with the print settings of the job that has been canceled (step S48).

  If the CPU 151 determines that the RIP settings are the same in step S48 (YES), it determines whether one page of data has been received (step S49), and if one page of data has not been received. (NO), returning to step S48, the processing of S48 → S49 is repeated. That is, it is determined whether or not the RIP settings are the same until one page of data is received. If the RIP settings are the same until data for one page is received, the CPU 151 reads page data from the corresponding page of the reception stop data in the storage unit 13 (step S50).

  On the other hand, if the CPU 151 determines that the RIP settings are different in step S48 (NO), since the RIP processing is required again even if the rasterized data is the same, the CPU 151 starts from the reception stop data (printing intermediate data) in the storage unit 13. The rasterized data portion is read (step S51), and then RIP processing is performed (step S52).

  As long as the data is the same, the CPU 151 continues the above series of processes until the end of the reception stop data. At this time, for print information and post-processing settings, setting values generated from newly received print data are used.

(Difference between received print data and re-received print data)
In the following, as an example, a specific description will be given of the difference in print data when printing a 3-page document transmitted with duplex printing = OFF and staple = OFF and a job transmitted with duplex printing = ON and staple = ON. To do.

  The print data includes a PJL portion starting from “% -12345X @ PJL” and a PDL portion starting from “%! PS-Adobe (registered trademark) -3.0”. In the present embodiment, PDL is described as Postscript (registered trademark).

  FIG. 10 shows received print data with duplex printing = OFF and staple = OFF, and re-received print data with duplex printing = ON and staple = ON. In FIG. 10, the left data is received print data with duplex printing = OFF and staple = OFF, and the right data is re-received print data with duplex printing = ON and staple = ON.

The difference between the received print data and the re-received print data in this example is
A driver job ID added by the printer driver of the client PC 20 as an ID for identifying a job in the PJL part
Print data indicating the date and time when the print data was generated by the printer driver in the PDL part Generation date and time ・ This is a part for setting ON / OFF of single-sided / double-sided printing and ON / OFF of staples.

  Here, during the printing of print data with duplex printing = OFF and staple = OFF, job cancellation occurred when RIP was completed up to the second page, and then print data with duplex printing = ON and staple = ON was sent again. The identity determination process in this case will be described.

  When the image forming apparatus 10 receives the print data of duplex printing = ON and staple = ON, the image forming apparatus 10 analyzes the PJL portion and holds it as print settings. In the PJL part where the received data is the PDL part and the print setting part "CreationDate" creation date and the post-processing settings "SHKMDuplex", "SHKMStaple" etc. that start with "BeginFeature" Keep it together with the analyzed print settings.

  Next, it is determined that the received data is print data, and the data is determined to be the same, and the process is repeated until data for one page is received. The above processing is performed up to the second page, and after the last (third page) of the print cancellation data, the third page is RIP-processed using the re-received print data, and printing is performed.

(Data comparison with differences in raster data)
Using FIG. 11 and FIG. 12, received print data having a difference in raster data is compared with re-received print data. FIG. 11 shows received print data, and FIG. 12 shows re-received print data.

  In this comparative example, the same three pages are compared with print data having different page contents. In the data comparison shown in FIGS. 11 and 12, the font information such as “OrigFontType” is the same, but the number of received print data lines in FIG. 11 is 22177 and the number of re-received print data lines in FIG. 12 is 2219. The raster data part to be started is different. For this reason, even if it is the same up to that point, it is determined that the data is different and normal printing processing is performed.

[Example 2]
The second embodiment is a modification of the first embodiment, and the PJL portion is the same as the first embodiment, but the RIP setting is different. FIG. 13 shows received print data and re-received print data in the case of the second embodiment.

  When the print setting is read in the raster data part in the analysis of the PDL part, it is compared with the print setting of the print stop data. As a result, “COLORCONFIG (ICC profile setting)”, “RGBCONVERSION (color conversion setting for RGB input)”, “CMYKCONVERSION (color conversion setting for CMYK input)”, which is known in the analysis of the PJL part, "KMColorMode (output color setting)" is different.

  Here, in the color conversion setting, RGB is the three primary colors of light, that is, red, green, and blue. CMYK is the three primary colors of the colorant, that is, cyan, magenta, yellow + black.

  In the second embodiment, the output color setting is particularly different between “Auto (full color)” and “Grayscale”, and it is determined that the part related to RIP is different in the matching of the identity by the matching unit 13 of FIG. The In this case, it is determined that the page data created with the print cancellation data cannot be used. If it is determined that the page data of the print cancel data cannot be used, the page data generation unit 12 in FIG. 3 discards the RIP-completed page data, and prints the newly received print data for one page of the print cancel data. RIP processing is performed again from the RIP setting to generate page data, and printing is performed.

As a setting value that requires RIP processing again,
-ICC profile (color conversion) setting-Fine line emphasis setting-Output color setting-Screen setting-Outline emphasis setting-Smoothing setting-Resolution etc. can be illustrated.

[program]
The various processes executed under the control of the CPU 151 of the control unit 15 described above are executed by program instructions for the CPU 151 which is an example of a computer. A processing program (the program of the present invention) that causes the CPU 151 to execute these various processes may be installed in advance in a storage unit provided in the image forming apparatus 10, for example, the ROM 153 (see FIG. 4) of the control unit. However, the present invention is not limited to this, and can be provided by wired or wireless communication means, or can be provided by being stored in a storage medium such as a computer-readable IC card or USB memory. It is.

[Modification]
As mentioned above, although this invention was demonstrated using embodiment, this invention is not limited to the range as described in the said embodiment. That is, various changes or improvements can be added to the above-described embodiment without departing from the gist of the present invention, and embodiments to which such changes or improvements are added are also included in the technical scope of the present invention.

  For example, in the above-described embodiment, the printer apparatus is exemplified as the image forming apparatus 100 according to the embodiment of the present invention. However, the present invention is not limited to this application example. That is, according to the present invention, when a job cancellation occurs in a copying machine, a printing machine, a multifunction machine, etc. in addition to a printer device, and new print data is received thereafter, the received print data and the new print data are The present invention can be applied to all image forming apparatuses having a function of collating identity.

  DESCRIPTION OF SYMBOLS 1 ... Printing system, 10 ... Image forming apparatus, 11 ... Reception part, 12 ... Page data generation part, 13 ... Memory | storage part, 14 ... Collation part, 15 ... Control part, 20 ... Client PC, 30 ... Communication line, 41 ... Communication I / F (interface) unit 42... Image reading unit 43. Image reading unit 44. Image forming unit 45. Paper feeding unit 46. Fixing unit 47.

Claims (3)

A page data generator that generates raster image processed page data from the received print data;
A storage unit that stores print data being received and page data generated by the page data generation unit when reception interruption occurs during reception of the print data;
When new print data is received, the identity of the print data stored in the storage unit and the new print data is collated, and the collation is determined to be the same even if the parts not related to raster image processing are different And
Control that discards new print data up to the location of the print data stored in the storage unit and reads the page data stored in the storage unit and starts printing when the collation unit determines that they are the same And
An image forming apparatus comprising: In the collation of identity by the collation unit, when it is determined that the part related to raster image processing is different,
2. The image formation according to claim 1, wherein the page data generation unit generates page data by discarding the page data that has undergone the raster image processing, performing raster image processing using the print data that has been stopped receiving, and generating page data. apparatus. In the image forming apparatus,
Processing to generate raster image processed page data from the received print data;
When reception interruption occurs during reception of the print data, a process of storing the print data being received and the generated page data in a storage unit;
When new print data is received, the identity of the print data stored in the storage unit and the new print data is collated, and the process is determined to be the same even if the portions not related to raster image processing are different When,
If determined to be the same, discarding new print data up to the location of the print data stored in the storage unit, reading the page data stored in the storage unit and starting printing;
A program that causes a computer to execute.

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