JP2011201058A - Printing control apparatus, method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow interruption of another printing job while performing two-sided printing on a continuous sheet; and to suitably complete the precedent two-sided printing.SOLUTION: When an instruction of interruption printing by one-sided printing is input while performing the two-sided printing, the interruption printing is performed following printing on a first surface of the precedent two-sided printing, and a sheet winding unit 113 is made to perform sheet winding.

Description

  The present invention relates to a print control apparatus, method, and program for printing using a continuous sheet.

  Conventionally, when printing images on both sides of continuous paper (continuous sheet) such as roll paper, after printing on one side of continuous paper introduced into the printing means, the continuous paper is cut and temporarily wound up, There is one that re-introduces the continuous paper into the printing means and performs printing on the opposite surface (see Patent Document 1). In such a printing apparatus, in order to perform efficient printing, printing on one side is continuously performed for a plurality of pages, and printing on all the pages on one side is completed, printing on the opposite side is performed. By performing double-sided printing in such a procedure, double-sided printing can be performed efficiently.

Japanese Patent Laid-Open No. 11-249346

  However, when performing double-sided printing according to such a procedure, printing on the same side is continued, so if another print job is interrupted halfway, the previous double-sided printing cannot be completed. . For example, if interrupt printing is performed during printing on the first side of double-sided printing, the sheet of the previous print job is discharged without printing on the second side. Become. In addition, when waiting for the completion of the previous double-sided printing, the completion of interrupt printing is delayed because continuous sheet refeeding and the like are performed.

  The present invention has been made in view of the above-described problems, and can interrupt another print job while performing double-sided printing on a continuous sheet, and can appropriately complete the previous double-sided printing. A printing control apparatus, method, and program are provided.

  In order to solve the above problems, the printing control apparatus of the present invention is a printing control apparatus capable of causing a printing unit to execute printing on a continuous sheet, and when printing on both sides of a continuous sheet by the printing unit, After the printing on the first surface of the continuous sheet, the reversing means for reversing the continuous sheet to perform the printing on the second surface, and during the printing process by the printing means Input means for inputting an instruction for interrupt printing, and duplex printing on the continuous sheet by the printing means based on a preceding job when an instruction for interrupt printing for performing printing on one side of the continuous sheet is input by the input means. When printing on the first surface of the continuous sheet is performed for printing, interrupt printing based on an interrupt printing instruction input by the input unit is performed based on the preceding job. And a print control means for controlling so as to perform the supply of the printed continuous sheet to the inversion means causes continuously performed for printing on a first surface of over bets.

  According to the present invention, interrupt printing by single-sided printing is performed after printing on the first side of the continuous sheet by the double-sided printing, and the printed continuous sheet is supplied to the reversing unit. Therefore, it is possible to interrupt another double-sided printing while performing double-sided printing on a continuous sheet, and the previous double-sided printing can be appropriately completed.

1 is a diagram illustrating a configuration of an image forming apparatus that is an example of an embodiment of the present invention. FIG. 2 is a block diagram illustrating a configuration relating to control of the image forming apparatus in FIG. 1. It is a flowchart which shows the flow of the double-sided printing process by this embodiment. It is a flowchart which shows the flow of the interrupt printing process by this embodiment.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In addition, the relative arrangement | positioning of each component of the apparatus used by this embodiment, an apparatus shape, etc. are an illustration to the last, and are not limited only to them.

  FIG. 1 is a diagram illustrating a schematic configuration of an image forming apparatus that is an example of a print control apparatus according to the present exemplary embodiment. The image forming apparatus shown in FIG. 1 has only a printing function. However, the image forming apparatus is not limited to this. The image forming apparatus further includes a reading device that reads an image on a document, and functions as a copier or a combination of other functions. It is good also as an apparatus. In addition, a recording material (recording medium or recording sheet) that uses a roll sheet will be described as an example of printing processing. However, it is possible to continuously print a plurality of pages on the same surface without being cut halfway. If it is a continuous sheet of a scale, it will not be restricted to the roll shape. Further, the continuous sheet may be cut automatically by the image forming apparatus, or may be cut by a user's manual instruction. The material of the recording material is not limited to paper, and various materials can be used as long as they can be printed. Further, the image forming apparatus may be an image forming apparatus capable of printing not only on a continuous sheet but also on a cut sheet that has been cut into a predetermined size. Further, the printing method is not limited to the image printing by the ink jet method using the liquid ink for image printing described later. Solid ink may be used as the recording agent, and various types such as an electrophotographic method using toner and a sublimation method may be employed. Further, the recording is not limited to color recording using a plurality of color recording agents, and monochrome recording using only black (including gray) may be performed. The printing is not limited to the printing of a visible image, but may be an invisible or difficult-to-view image printing. Other than general images, for example, a wiring pattern, a physical pattern in the manufacture of parts, a DNA base It is good also as printing of various things, such as a print of arrangement | sequences. That is, the present invention can be applied to various types of recording apparatuses as long as the recording agent can be applied to the recording material. Further, when the operation of the printing process in the image forming apparatus is controlled by an instruction from the external apparatus connected to the image forming apparatus in FIG. 1, this external apparatus becomes the print control apparatus.

  FIG. 1 is a cross-sectional view schematically illustrating an overall configuration of an image forming apparatus using a roll sheet (a continuous continuous sheet longer than the length of a printing unit (one page) in the conveyance direction) as a recording material. The image forming apparatus includes the following components 101 to 115, which are arranged in one housing. However, these components may be divided into a plurality of cases.

  The control unit 108 incorporates a controller (including a CPU or MPU), an output device for user interface information (a generator for display information, acoustic information, etc.), and a control unit having various I / O interfaces, and the entire image forming apparatus. Manage various controls.

  Two units, an upper sheet cassette 101a and a lower sheet cassette 101b, are provided as units for supplying roll sheets. The user loads a roll sheet (hereinafter referred to as a sheet) on the magazine and then loads it on the image forming apparatus main body. The sheet pulled out from the upper sheet cassette 101a is conveyed in the direction a in the figure, and the sheet pulled out from the lower sheet cassette 101b is conveyed in the direction b in the figure. Sheets from any cassette travel in the direction c in the figure and reach the transport unit 102. The conveyance unit 102 conveys the sheet in the d direction (horizontal direction) in the drawing during the printing process through the plurality of rotating rollers 104. When switching from one sheet cassette to another sheet source, the already pulled out sheet is rewound into the cassette, and a new sheet is fed from a cassette in which a sheet to be newly fed is set. In addition, when a series of printing processes is completed, the already drawn sheet is rewound into the cassette, and when a new print job is received, a new sheet is fed from the cassette.

  A head unit 105 is disposed above the transport unit 102 so as to face the transport unit 102. In the head unit 105, independent print heads 106 for a plurality of colors (seven colors in the present embodiment) are held along the sheet conveyance direction. In this example, there are seven print heads corresponding to seven colors of C (cyan), M (magenta), Y (yellow), LC (light cyan), LM (light magenta), G (gray), and K (black). The Of course, other colors may be used, and it is not necessary to use all of them. The image forming apparatus forms an image on the sheet by ejecting ink from the print head 106 in synchronization with the conveyance of the sheet by the conveyance unit 102. Note that the print head 106 is disposed at a position where the ink discharge destination does not overlap the rotation roller 104. Instead of ejecting the ink directly onto the sheet, an image may be formed by applying the ink to the intermediate transfer member and then applying the ink to the sheet. A printing unit is configured including the transport unit 102, the head unit 105, and the print head 106. The ink tank 109 stores each color ink independently. Ink is supplied from the ink tank 109 to a sub tank provided corresponding to each color by a tube, and ink is supplied from the sub tank to each print head 106 through the tube. The print head 106 has line heads of respective colors (seven colors in the present embodiment) arranged along the conveyance direction d during printing. The line head of each color may be formed with a single nozzle tip without a seam, or the divided nozzle tips may be regularly arranged in a single row or a staggered arrangement. . In this embodiment, a so-called full multi-head in which nozzles are arranged in a range that covers the width of the print area of the maximum size sheet that can be used by the apparatus is used. As an ink jet method for ejecting ink from a nozzle, a method using a heating element, a method using a piezo element, a method using an electrostatic element, a method using a MEMS element, or the like can be adopted. Ink is ejected from the nozzles of each head based on the print data, and the ejection timing is determined by the output signal of the transport encoder 103. Note that the present embodiment is not limited to an ink jet printer using ink as a recording agent. The present invention can be applied to various printing methods such as a thermal printer (sublimation type, thermal transfer type, etc.), an electrophotographic method such as a dot impact printer, an LED printer, and a laser printer.

  After the image is formed on the sheet, the sheet is conveyed from the conveyance unit 102 to the scanner unit 107. The scanner unit 107 optically reads a print image or special pattern on a sheet to check whether there is a problem with the print image, and checks the state of the apparatus including the ink discharge state. In this embodiment, in the image confirmation method, the ink ejection state may be confirmed by reading a pattern for confirming the head state, or the success or failure of printing may be confirmed by comparing with the original image. You may do it. The confirmation method can be appropriately selected from various methods.

  The sheet is conveyed in the direction e from the vicinity of the scanner unit 107 and introduced into the cutter unit 110. The cutter unit 110 cuts the sheet every predetermined printing unit length. The length of the predetermined printing unit varies depending on the image size to be printed. For example, the length in the transport direction is 135 mm for the L size photograph, and the length in the transport direction is 297 mm for the A4 size. The cutter unit 110 cuts the sheet in units of pages in the case of single-sided printing, but may not cut in units of pages depending on the contents of the print job. In the case of double-sided printing, the cutter unit 110 continuously prints images up to a predetermined length without cutting the first surface (for example, the front surface) of the sheet in units of pages, and the second surface (for example, the front surface). When printing (back side), cut by page. Note that the cutter unit 110 is not limited to one that cuts each image when performing single-sided printing or reverse-side printing of double-sided printing. It is not cut until it is transported for a predetermined length, but is cut after it is transported to a predetermined length, and is cut by manual operation or the like with another cutter device. It is good. In the width direction of the sheet, when cutting is necessary, the sheet is cut using another cutter device.

  The sheet conveyed from the cutter unit 110 is conveyed in the direction f in the drawing and is conveyed to the back surface printing unit 111. The back side printing unit 111 is a unit for printing predetermined information on the back side of the sheet when printing an image only on one side of the sheet. Information to be printed on the back side of the sheet includes information (for example, order management number) corresponding to each print image, such as characters, symbols, and codes. When the print head 106 prints an image for a double-sided print job, the back surface printing unit 111 prints information as described above in addition to the area where the print head 106 prints an image. The back surface printing unit 111 can employ a method such as imprinting of a recording agent, thermal transfer, and ink jet.

  The sheet that has passed through the back surface printing unit 111 is then conveyed to the drying unit 112. The drying unit 112 is a unit that heats a sheet that passes through the unit in the direction g in the drawing with warm air (heated gas (air)) in order to dry the sheet to which ink has been applied. . In addition, instead of using warm air, various drying methods such as cold air, heating with a heater, natural drying only by waiting, irradiation with electromagnetic waves such as ultraviolet light can be employed. The sheets cut to the printing unit length pass through the drying unit 112 one by one, are conveyed in the h direction in the figure, and are conveyed to the sorting unit 114. The sorting unit 114 holds a plurality of trays (18 in this embodiment), and distinguishes the sheet discharge destination tray according to the length of the printing unit or the like. Each tray is assigned a tray number. In the sorting unit 114, a sheet that passes through the unit in the direction i in the figure is checked with a sensor provided on each tray, and a tray set for each print image is checked while checking whether the tray is empty or full. Paper is discharged to the tray corresponding to the number. A tray to which the cut sheet is discharged may be specified by a print job issuer (host device), or an empty tray may be arbitrarily specified on the image forming apparatus side. . Paper can be discharged up to a predetermined number on one tray. In the case of a print job exceeding the predetermined number, the sheet is discharged across a plurality of trays. The number, size, type, and the like of sheets that can be discharged to a tray vary depending on the size (type) of the tray. In FIG. 1, trays (hereinafter referred to as “large trays”) arranged vertically (upper and lower) are large sheets (A4 size, etc., larger than the L plate size) and small sheets (L plate size). Paper is possible. Further, trays (hereinafter referred to as small trays) arranged side by side (left and right) can discharge small-sized (L size) sheets, but cannot discharge large-sized sheets. The large tray can output more sheets than the small tray. In addition, a state such as sheet discharge or completion of sheet discharge can be identified by the user using a display (for example, an LED or the like is used). For example, a plurality of LEDs that emit light of different colors can be provided for each tray, and the user can be notified of the various states of each tray depending on the color of the LEDs that are lit or whether they are lit or blinking. Further, priorities can be assigned to each of the plurality of trays, and when the image forming apparatus 200 executes the print job, the empty trays (sheets do not exist) are assigned to the sheet discharge destinations in order according to the priorities. Will be assigned as. By default, the large tray has a higher priority on the upper tray and the smaller tray has a higher priority on the left. The priority of the small tray is higher than that of the large tray. This priority may be increased as needed by increasing the priority of the position where the user can easily take out the sheet.

  The sheet winding unit 113 winds a sheet on which the front surface is printed without being cut for each page by a rotating operation. In duplex printing, a sheet on which an image has been formed on the front side is not cut by the cutter unit 110 in units of pages, but is cut after printing of the continuous front side is completed. The sheet on which the front surface is printed passes through the unit in the j direction in the figure, and is wound by the sheet winding unit 113. Then, after the image formation on the front surface for a series of pages has been completed, the wound sheet has a surface opposite to the previous front surface that can be printed, that is, facing the print head 106. The surface to be reversed is reversed and conveyed again in the k direction in the drawing of the unit. By carrying it in this way, the image on the back surface opposite to the front surface is printed. In the case of normal single-sided printing, the sheet on which the image is printed is conveyed to the sorting unit 114 without being wound by the sheet winding unit 113.

  As described above, when performing duplex printing, the sheet winding unit 113 is used to wind the sheet, and the sheet is reversed and printed on the back side. Therefore, the sorting unit is used for single-sided printing and double-sided printing. The surface of the sheet when discharged to 114 is different. That is, in the case of single-sided printing, since the sheet is not reversed using the sheet winding unit 113, the sheet on which the image of the first page is printed is discharged with the image of the first page facing down. When a single print job is a job having a plurality of pages, the first sheet is discharged from the sheet to the tray, and subsequently discharged sequentially to subsequent pages and the sheets overlap. Such paper discharge is called face-down paper discharge. On the other hand, in the case of duplex printing, since the sheet is reversed using the sheet winding unit 113, the sheet on which the image of the first page is printed is discharged with the image of the first page facing up. When one print job is a job for outputting a plurality of sheets, the sheet including the last page is discharged to the tray, and subsequently discharged to the sheets of the younger pages. The sheet on which the image of the first page is printed is discharged. Such paper discharge is called face-up paper discharge.

  The operation unit 115 is a unit for the user to perform various operations and notify the user of various information. For example, it is possible to check the printing status for each order such as on which tray the sheet on which the image designated by the user is printed is stacked, or whether the image is being printed or has been printed. In addition, the user can operate / confirm in order to confirm the various states of the apparatus such as the remaining amount of ink and the remaining amount of the sheet, and to instruct the execution of apparatus maintenance such as head cleaning.

  FIG. 2 is a block diagram for explaining a configuration relating to control in the image forming apparatus shown in FIG. The image forming apparatus 200 is the image forming apparatus shown in FIG.

  The CPU 201, ROM 202, RAM 203, image processing unit 207, engine control unit 208, and scanner control unit 209 are mainly included in the control unit 108. The control unit 108 is connected to the HDD 204, the operation unit 206, the external I / F 205, and the like via the system bus 210.

  The CPU 201 is a central processing unit in the form of a microprocessor (microcomputer), and is included in the control unit 108 of FIG. The CPU 201 controls the overall operation of the image forming apparatus 200 by executing a program or starting up hardware. The ROM 202 stores programs to be executed by the CPU 201 and fixed data necessary for various operations of the image forming apparatus 200. The RAM 203 is used by the CPU 201 as a work area, used as a temporary storage area for various received data, and stores various setting data. The HDD 204 can store or read a program to be executed by the CPU 201, print data, and setting information necessary for various operations of the image forming apparatus 200 on a built-in hard disk. Further, when a print job is input, the CPU 201 sets an ID that can identify the received print job in the job queue in the HDD 204 and manages the print order. In place of the HDD 204, another mass storage device may be used.

  The operation unit 206 includes a hard key and a touch panel for the user to perform various operations, and a display unit for presenting (notifying) various information to the user, and corresponds to the operation unit 115 in FIG. . Information can also be presented to the user by outputting sound (buzzer, sound, etc.) based on the sound information from the sound generator.

  The image processing unit 207 performs development (conversion) and image processing of print data (for example, data expressed in a page description language) handled by the image forming apparatus 200 into image data (bitmap image). A color space (for example, YCbCr) of image data included in the input print data is converted into a standard RGB color space (for example, sRGB). In addition, various image processing such as resolution conversion to the number of effective pixels (image processing apparatus 200 can perform print processing), image analysis, image correction, and the like is performed on the image data as necessary. Image data obtained by these image processes is stored in the RAM 203 or the HDD 204.

  The engine control unit 208 controls processing for printing an image based on print data on a sheet in accordance with a control command received from the CPU 201 or the like. An ink ejection instruction to the print head 106 of each color, an ejection timing setting for adjusting a dot position (ink landing position) on the recording medium, adjustment based on acquisition of a head driving state, and the like are performed. The print head drive is controlled according to the print data, and ink is ejected from the print head to form an image on the sheet. In addition, the conveyance roller is controlled such as a feed roller drive instruction, a conveyance roller drive instruction, and a conveyance roller rotation status acquisition, and the sheet is conveyed and stopped at an appropriate speed and path.

  The scanner control unit 209 controls the image sensor in accordance with the control command received from the CPU 201 or the like, reads an image on the sheet, and analog luminance data of red (R), green (G), and blue (B) colors. Is obtained and converted to digital data. As the image sensor, a CCD image sensor, a CMOS image sensor, or the like can be employed. The image sensor may be a linear image sensor or an area image sensor. Further, the scanner control unit 209 obtains an image sensor driving instruction and acquires the status of the image sensor based on the driving, analyzes the luminance data acquired from the image sensor, and discharges ink from the print head 106 or cuts the sheet. The position is detected. The sheet on which the image is correctly printed by the scanner control unit 209 is discharged to the tray of the designated sorting unit after the ink on the sheet is dried.

  The host apparatus 211 corresponds to the above-described external apparatus, is connected to the outside of the image forming apparatus 200, and is an apparatus serving as a supply source of image data for causing the image forming apparatus 200 to perform printing. Issue an order. The host device 211 may be realized as a general-purpose personal computer (PC) or may be another type of data supply device. As another type of data supply device, there is an image capture device that captures an image and generates image data. The image capture device is a reader (scanner) that reads an image on a document and generates image data, a film scanner that reads a negative film or a positive film, and generates image data. Other examples of the image capture device include a digital camera that captures a still image and generates digital image data, and a digital video that captures a moving image and generates moving image data. In addition, install a photo storage on the network or provide a socket for inserting removable memory, read the image file stored in the photo storage or portable memory, generate image data and print it It may be a thing. Further, instead of a general-purpose PC, various data supply devices such as a dedicated terminal for the image forming apparatus may be used. These data supply apparatuses may be components of the image forming apparatus or may be other apparatuses connected to the outside of the image forming apparatus. When the host device 211 is a PC, an OS, application software for generating image data, and a printer driver for the image forming apparatus 200 are installed in the storage device of the PC. The printer driver controls the image forming apparatus 200 or generates print data by converting the image data supplied from the application software into a format that can be handled by the image forming apparatus 200. Alternatively, conversion from print data to image data may be performed on the host apparatus 211 side before being supplied to the image forming apparatus 200. Note that it is not essential to implement all of the above processing by software, and a part or all of the processing may be realized by hardware. Image data, other commands, status signals, and the like supplied from the host device 211 can be transmitted / received to / from the image forming apparatus 200 via the external I / F 205. The external I / F 205 may be a local I / F or a network I / F. The external I / F 205 may be a wired connection or a wireless connection.

  The above-described components in the image forming apparatus 200 are connected via the system bus 210 and can communicate with each other.

  In the above example, one CPU 201 controls all the components in the image forming apparatus 200 shown in FIG. 2, but other configurations are possible. That is, some of the functional blocks may be provided with separate CPUs and individually controlled by the respective CPUs. Each functional block may adopt various forms, such as appropriately dividing as an individual processing unit or control unit, or integrating some of the functional blocks according to a method other than the configuration shown in FIG. Also, a direct memory access controller (DMAC) can be used to read data from the memory.

  Next, a flow of processing when executing a print job by the image forming apparatus 200 in the above configuration will be described. FIG. 3 is a flowchart illustrating a processing flow when the image forming apparatus 200 receives a double-sided print job and executes the print job. This flowchart shows the flow of processing performed by the CPU 201 loading a control program stored in the ROM 202 or the HDD 204 into the RAM 203 and executing it. The sheet size (roll width) and sheet type (plain paper, glossy paper, film, etc.) set in the sheet cassettes 101a and 101b by the operation from the operation unit 206 by the user are registered in the RAM 203. And

  In S301, when a print job is received via the external I / F 205, processing of this print job is started. The accepted print job is temporarily stored in the HDD 204. In step S302, the print page order of the received print job is determined.

  In S302, first, the printing order is determined so that printing on the first surface (for example, the front surface) of the sheet is continued for a plurality of pages, and then printing on the opposite surface is continued for a plurality of pages. Here, what is continuously printed on the same surface is that the sheet types (sheet size and sheet type) of the sheets to be used match. However, even if the sheet sizes do not match, printing on a sheet larger than the output sheet size specified in the print job may be permitted, or the sheet type may not be considered. In addition, it may be determined whether to perform continuous printing based on the printing mode (single-sided printing, double-sided printing, bookbinding printing). In any case, any multi-page image that can be printed on the same sheet may be printed continuously. Here, a plurality of pages may be continued on the same surface only in one print job or across a plurality of print jobs. Further, the printing order is reversed between the first surface and the second surface. That is, if the first surface is in ascending order, the second surface is in descending order. When printing on the second side, after the last printing on the first side, the sheet is cut and conveyed from the cut side of the sheet (the opposite side of the page that was printed last on the first side) It is to be done.

  Next, in S303, printing on the first surface (here, the front surface) of the sheet is started in accordance with the page order determined in S302. That is, the CPU 201 supplies the print data of each page to the image processing unit 207 according to the determined printing order. The image processing unit 207 converts the print data of the front surface into a format that can be printed (development processing to image data), and stores the image data in the HDD 204. The generated image data is supplied to the engine control unit 208 in the order of the pages. At this time, the engine control unit 208 is notified of the image data for printing on which side of the sheet, the number of pages of data, and information that can specify the print job together with the image data.

  Upon receiving this image data, the engine control unit 208 feeds the sheet from the sheet cassette 101a or 101b according to the size of the image to be printed and the sheet type of the sheet to be used. The engine control unit 208 causes the conveyance unit 102 to convey the sheet to the printing position by the head unit 105, sequentially prints an image based on the image data on the front surface of the sheet, and reaches the reading position of the scanner unit 107. Transport the sheet. Whether or not the image is printed correctly is confirmed based on the content of the image data obtained by reading the printed image by the scanner unit 107 and conveyed to the cutter unit 110. If it is confirmed that the image is printed correctly, the cutter unit 110 does not cut the page unit, and passes the drying unit 112 while the pages are connected to perform the ink drying process. After that, the sheet is wound by the sheet winding unit 113. The reason why the sheet winding unit 113 performs the winding without cutting the sheet unit is that the printing here is double-sided printing. In the case of single-sided printing, sheets are cut in page units (may not be cut in some cases), and winding by the sheet winding unit 113 is not performed. On the other hand, when it is confirmed that the image is not printed correctly, the CPU 201 causes the cutter unit 110 to perform cutting to discharge a page that is not printed correctly. Then, the cut sheet is discharged to a tray (for example, a tray at the lowermost position) that discharges defectives among the trays of the sorting unit 114. Then, the CPU 201 supplies the image data to the engine control unit 208 again and repeats the subsequent processing in order to perform reprinting for the portion that has not been correctly printed.

Then, when printing up to the continuous printing on the front surface is completed, the process proceeds to S304, where the cutter unit 110 cuts the printed sheet on the front surface. In step S <b> 305, the sheet with the front surface printed on the sheet winding unit 113 is re-conveyed to the conveyance unit 102 so that the surface opposite to the first surface faces the head unit 105. In step S306, the back side is printed. Since the back side printing is the same as the front side, detailed description is omitted. However, when printing the back side, the sheet is printed by the cutter unit 110 in units of pages (there may be two pages in case of bookbinding printing). Disconnect. Then, the cut sheet is discharged to the tray of the sorting unit 114. Depending on the content specified in the print job, the sheet may not be cut here.
The above is the flow of processing when double-sided printing is performed without causing an interruption in the middle.

  Next, a process when an interrupt print job is input after receiving the above double-sided printing process or single-sided printing process will be described.

  FIG. 4 is a flowchart showing the flow of processing when interrupt printing is performed. This flowchart shows the flow of processing performed by the CPU 201 loading a control program stored in the ROM 202 or the HDD 204 into the RAM 203 and executing it.

  In step S401, an interrupt print job execution instruction is input. It is assumed that the interrupt print job is a print job including information indicating that it should be executed urgently from the host device 211. However, a print job selected from the host device 211 or the operation unit 206 and instructed to be executed urgently among print jobs already received by the image forming apparatus 200 also corresponds. If there is a print job with a lower priority than the job to be executed in the future, depending on the priority specified for each print job or the priority based on the print job issuer, Printing may be performed earlier. Alternatively, the user may directly designate “interrupt printing” so that printing is executed prior to a normal print job not designated for interruption.

  In step S402, it is determined whether there is a preceding job being printed. Here, the negative determination is made when the image forming apparatus 200 accepts the interrupted print job before the interrupt print job and there is no print job waiting or when one unit of printing is finished and the next print is prepared. This is a case where the edge image forming apparatus 200 is not printing. If a negative determination is made here, the process proceeds to S403, and printing based on the print job input in S401 is executed. On the other hand, if a positive determination is made, the process proceeds to S404.

  In S404, it is determined whether the sheet type (sheet size, sheet material, etc.) specified in the interrupt print job input in S401 is the same as the sheet type used in the preceding job. Here, only the sheet size or the material of the sheet may be used as the comparison target as the sheet type. Further, there are cases where the image forming apparatus 200 supports only a specific sheet, or there are cases where the sheet type is not specified in the print job. In such cases, the determination in S404 and the processing in S419 to 425 are omitted. Is done. Here, the process branches depending on whether or not printing for the interrupt print job can be performed following the sheet used in the preceding job. If it is determined in S404 that the sheet types are the same, the process proceeds to S405. If it is determined that the sheet types are not the same, the process proceeds to S419.

  In step S405, it is determined whether the preceding job is a print job for printing on both sides of the sheet. If a positive determination is made here, the process proceeds to S409, and if a negative determination is made, the process proceeds to S406.

  In step S406, it is determined whether the interrupt print job input in step S401 is a print job for printing on both sides of the sheet. If a positive determination is made here, the process proceeds to S426, and if a negative determination is made, the process proceeds to S407.

  In step S407, the preceding job currently being printed is interrupted and printing of the interrupt print job input in step S401 is started. The interruption of the preceding job here may be performed after the printing of the page on which printing has been started, or printing of the page of image data that has already been prepared for printing by the engine control unit 208. You may go where you are finished. In step S408, after printing of the interrupt print job is completed, the remaining pages of the interrupted preceding job are printed. Here, since the preceding job and the interrupt job are single-sided printing, the printed sheet is not taken up by the sheet take-up unit 113. The printed sheet is cut by the cutter unit 110 and discharged to a designated tray.

  In step S409, it is determined whether the interrupt print job input in step S401 is a print job for printing on both sides of the sheet. If a positive determination is made here, the process proceeds to S410, and if a negative determination is made, the process proceeds to S414.

  In step S410, it is determined whether the preceding job determined to be printing in step S402 is printing the front side of double-sided printing. Here, a negative determination is made when printing on the back side of the sheet has already started. In this case, the process proceeds to S426. On the other hand, while printing on the front side of the sheet or printing on the front side is completed, the sheet is being wound up by the sheet winding unit 113 (printing on the back side is started). If not, the process proceeds to S411. That is, in S410, if printing on the back surface (second surface) of the sheet is not started in the double-sided printing of the preceding job, a positive determination is made.

  In step S411, the front side of the interrupt job is printed following the printing of the front side of the preceding job. Here, after printing the last image of the front surface of the preceding job, the front surface of the interrupt job is printed without cutting the sheet by the cutter unit 110. Further, since the printing here is double-sided printing, the printed sheet is taken up by the sheet take-up unit 113. This eliminates the need for sheet cutting and rewinding to the cassette between the preceding job and the interrupt job, and wasteful processing does not occur.

  In step S412, the sheet is cut by the cutter unit 110 when the last image of the front surface of the interrupt job is printed, and the sheet is reversed for printing on the back surface.

  In step S413, the back side of the interrupt job is printed. When this is completed, the back side of the preceding job is printed. Here, the sheet is cut by the cutter unit 110 in units of pages, and the sheet of the interrupt job and the sheet of the preceding job are discharged to different trays of the sorting unit 114 so that they are not mixed with each other. Here, the reason why the reverse side of the interrupt job is printed first is that the inverted sheet reaches the print head 106 from the side on which the last image on the front side of the interrupt job is printed. . As a result, since the interrupt job can be printed first, the interrupt job can be completed quickly. Moreover, the preceding job is not greatly delayed.

  In step S414, it is determined whether the preceding job determined to be printing in step S402 is printing the front side of double-sided printing. The determination here is the same as the determination in S410. If an affirmative determination is made, the process proceeds to S415. If a negative determination is made, the process proceeds to S426.

  In step S415, the interrupt job, which is single-sided printing, is printed following the printing of the front side of the preceding job. Here, since the preceding job is duplex printing, the sheet winding unit 113 performs winding after the top of the sheet has passed through the drying unit 112. That is, although the interrupt job is single-sided printing here, the preceding job is double-sided printing, and thus the printed sheet is supplied to the sheet winding unit 113. Note that when printing on single-sided printing is performed when printing based on the preceding job is not performed, the printed sheet is not supplied to the sheet winding unit 113.

  In step S416, the cutter unit 110 cuts the sheet between the last image on the front surface of the preceding job and the first image in the interrupt job. In other words, the sheet on which the front image of the preceding job and the image of the interrupt job are printed is conveyed, and the boundary between the last image of the preceding job and the leading image of the interrupt job reaches the cutting position by the cutter unit 110. When the sheet is cut.

  In step S417, the sheet on which the front surface of the preceding job has been printed is continuously wound by the sheet winding unit 113. On the other hand, the sheet on which the interrupt job has been printed is discharged to the designated tray of the sorting unit 114 by switching the conveyance path after the sheet of the preceding job is conveyed to the sheet winding unit 113 side. At this time, the interrupt job sheet is cut by the cutter unit 110 in units of pages. Also, the tray to which the interrupt job sheet is discharged is the tray specified when the interrupt job is specified or the tray for the interrupt job. Then, by using a tray different from the preceding job, mixing with the sheet of the preceding job is prevented. As described above, in S417, the printed sheet is supplied to the sheet take-up unit 113 in S415, but the interrupt job is cut before being taken up by the sheet take-up unit 113 and conveyed to the sorting unit 114. The

  In step S418, after the interrupt job printing is completed, the sheet of the preceding job is conveyed from the sheet winding unit 113 in a state where the sheet surface is reversed, and printing of the back surface of the preceding job is executed. Here, the sheet on which the image on the back side is printed is cut by the cutter unit 110 page by page, and the cut sheet is discharged to the tray designated by the preceding job. At this time, since the sheet of the preceding job is discharged to a different tray from that of the interrupt job, it is not mixed with each other, and the user can easily take out the sheet.

  In step S419, it is determined whether the preceding job is a print job for printing on both sides of the sheet. If a positive determination is made here, the process proceeds to S420, and if a negative determination is made, the process proceeds to S426.

  In S420, it is determined whether the interrupt print job input in S401 is a print job for printing on both sides of the sheet. If an affirmative determination is made here, the process proceeds to S426, and if a negative determination is made, the process proceeds to S421.

  In step S421, it is determined whether the preceding job determined to be printing in step S402 is printing the front side of double-sided printing. The determination here is the same as the determination in S410. If an affirmative determination is made, the process proceeds to S422, and if a negative determination is made, the process proceeds to S426.

  In step S422, printing of the front surface of the preceding job is continued, and during that time, the interrupt print job is held in the HDD 204 and waited. Here, the front side pages on which printing is continued are all front side pages of one print job. However, all of the pages on the front side of a plurality of print jobs determined to be continuously printed on the front side in S302 may be used. If it is determined in S421 that printing of the front side has already been completed, only the process of waiting for the interrupt print job is performed in the process of S422. Since the preceding job here is duplex printing, the printed sheet is taken up by the sheet take-up unit 113.

  In step S423, when printing of the front surface of the preceding job is completed, the sheet is cut by the cutter unit 110, and the sheet is held in a state where the sheet is wound by the sheet winding unit 113.

  In step S424, the interrupt job that was waiting in step S422 is printed. Here, since a sheet different from the preceding job is used, a sheet set in a cassette different from the cassette that supplied the preceding job sheet is supplied, or the sheet of the cassette that supplied the preceding job sheet is used. It will be supplied after replacement. The sheet on which the interrupt job has been printed is cut in units of pages, and the cut sheet is discharged to a designated tray. The tray that is the discharge destination is different from the tray specified in the preceding job, and is not mixed with each other.

  In S425, after the interrupt printing in S424 is completed, the preceding job is resumed, the sheet surface of the sheet held by the sheet winding unit 113 is reversed and conveyed to the print head 106, and printing on the back surface is performed. . Here, the cutter unit 110 is made to cut sheets in page units, and the cut sheets are discharged to a designated tray. Here, the tray as the discharge destination is different from the discharge destination of the interrupt job sheet.

  In step S426, the interrupt print job input in step S401 is set at the top position where it can be interrupted in the job queue waiting to be printed, and waits. That is, even if there is a subsequent print job that has not yet started print processing, this interrupt print job is started before that. At this time, the preceding job that has already started printing is continued without interrupting printing.

  In step S427, when the preceding job has been printed and the interrupt job processing order has been reached in the queue, the interrupt job is printed. Note that the sheet of the preceding job performed in S426 and the sheet of the interrupt job performed in S427 are discharged to different trays so that they are not mixed with each other.

  In S412, 423, the sheet may not be cut, such as when all the sheets set in the cassette are used. This is because winding by the sheet winding unit 113 can be completed if the sheet is separated from the cassette 101a or 101b.

  In the above example, in order to prevent the sheets discharged by the printing process of the preceding job and the sheets discharged by the interrupt printing from being mixed, the interrupt printing sheets are designated as specific trays among the trays of the sorting unit 114. May be used. For example, the uppermost stage of the large tray may be used for interrupt printing.

  As described above, according to the present embodiment, in a case where printing is performed using a continuous sheet, a subsequent job can be interrupted without wasting a printed portion of a preceding job that has already started printing. Is possible. Also, interrupt printing can be performed without greatly delaying the completion of the preceding job. In addition, by continuing the preceding job and the interrupt job without cutting the sheet in the middle, the number of times of rewinding the sheet to the cassette and re-feeding from the cassette is reduced, and both the preceding job and the interrupt printing are made efficient. Can be executed automatically.

  In the above example, if the preceding job has started printing on the back side according to the determination in S410, 414, 420, the preceding job is completed and then interrupt printing is executed in S426. It is also possible to execute interrupt printing without waiting for completion. That is, when an interrupt printing instruction is input in step S401, if the back side of the preceding job is being printed, the back side printing is completed to the point where it can be stopped, and the sheet take-up unit 113 when the sheet is cut. Reverse. As a result, the sheet of the preceding job can be put on standby, and interrupt printing is executed in this state. When the interrupt printing is completed, the continuation of the printing on the back side of the preceding job is executed. As a result, even if the preceding job has shifted to the back side printing, the interrupt printing can be completed quickly. At this time, the sheets discharged by the printing of the preceding job are discharged to the same tray before and after interruption, or are discharged to a tray other than the tray before interruption and the tray for interruption printing. The former saves the trouble of rearranging the sheets before and after the interruption, and the latter makes it possible to distinguish the minutes before and after the interruption.

  Further, in the above example, in S411, 415, and 421, the printing on the front surface of the preceding job is completed as it was decided to print continuously continuously, but this is completed. It is also possible to start interrupt printing before. That is, if the front side of the preceding job is printed when an interrupt printing instruction is input in step S401, the front side is printed when the front side has been printed to the point where it can be stopped. Printing is interrupted halfway, and the sheet is cut by the cutter unit 110. Then, the cut sheet is waited in a state of being wound by the sheet winding unit 113, and interrupt printing is executed. Then, printing of the waiting preceding job is resumed. When the preceding job is resumed, the printing order needs to be determined again. In other words, when resuming, since the front side is printed up to the middle of the schedule, it is necessary to print the opposite side first. Therefore, the number of pages printed on the front side is specified, and the opposite side is printed. Subsequently, the remaining pages on the front side are continuously printed, and the opposite side is printed. The printing order is determined so that printing is performed in the above order. At this time, the sheets discharged by the printing of the preceding job are discharged to the same tray before and after interruption, or are discharged to a tray other than the tray before interruption and the tray for interruption printing. As described above, interrupt printing can be completed earlier.

  Also, printing on the same surface of the preceding job is not completed depending on whether the usage amount (length in the transport direction) of the remaining sheets of the preceding job at the time when the interrupt printing instruction is input is larger than a predetermined amount. It may be determined whether or not to interrupt.

  In the above example, the sheet that has been printed on the first side during double-sided printing is taken up by the sheet take-up unit 113. However, even if the sheet is put on standby without being taken up in a roll shape. Good. That is, if the reversing mechanism can continuously print on the first side and then wait (hold the sheet), and reverse the sheet and then print on the second side. The standby state and inversion may be in various forms.

  In the above description, processing such as scheduling of the print order and determination of whether or not to interrupt can be performed by an external device such as a host device or an external controller, and printing is performed on the image forming apparatus accordingly. May be executed. At that time, it is preferable that the external apparatus obtains the status (information such as the current printing status) from the image forming apparatus and determines the printing order and interrupt timing.

  The present invention can also be realized by executing the following processing. That is, software (program) for realizing 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. Further, the program may be executed by a single computer or may be executed in conjunction with a plurality of computers. Moreover, it is not necessary to implement all of the above-described processing by software, and part or all of the processing may be implemented by hardware.

  The present invention is not limited to the above-described embodiment, and various modifications (including application to other embodiments, combinations with other embodiments, etc.) are possible based on the spirit of the present invention.

Claims (6)

A printing control apparatus capable of causing a printing means to execute printing on a continuous sheet,
When printing on both sides of the continuous sheet by the printing means, after printing on the first side of the continuous sheet, a reversing means for inverting the continuous sheet to cause printing on the second side;
Input means for inputting an instruction for interrupt printing while performing processing for printing by the printing means;
Printing on the first side of the continuous sheet for double-sided printing on the continuous sheet by the printing unit based on the preceding job when an interrupt printing instruction for performing printing on one side of the continuous sheet is input by the input unit Is performed, the interrupt printing based on the interrupt printing instruction input by the input unit is performed following the printing on the first surface of the continuous sheet based on the preceding job, and the reversing unit And a print control unit that controls to supply a continuous sheet that has been printed.   The printing control unit controls the printing unit not to supply the printed continuous sheet to the reversing unit when the printing unit performs printing on one side of the continuous sheet when printing based on the preceding job is not performed. The printing control apparatus according to claim 1, wherein: Cutting means for cutting the continuous sheet;
The printing control means uses the cutting means to cut the continuous sheet at the boundary between printing on the first surface of the continuous sheet based on the preceding job and interrupt printing based on an interrupt printing instruction input by the input means. Interrupt printing input by the input unit after cutting and supplying the reversing unit to print the second side for printing on the first side of the continuous sheet based on the preceding job 3. The print control apparatus according to claim 1, wherein control is performed so that the reversing unit is not supplied when interrupt printing based on the instruction is performed. Determining means for determining whether the continuous sheet used in the preceding job and the continuous sheet used in interrupt printing based on the interrupt printing instruction input by the input means are the same;
When the determination unit determines that they are the same, the printing control unit causes the interruption printing based on the instruction of the interruption printing input by the input unit to be performed following the printing based on the preceding job and to the reversing unit. If it is determined that they are not the same, it is input by the input unit until printing on the first and second sides of the continuous sheet based on the preceding job is completed. The print control apparatus according to claim 1, wherein an interrupt print based on an interrupt print instruction is waited. When printing on both sides of the continuous sheet, after the printing on the first surface of the continuous sheet by the printing means, the continuous sheet is reversed by the reversing means for inverting the continuous sheet so as to print on the second surface. Is a printing control method for performing printing by inverting
While the processing for printing is being performed by the printing means, an interrupt printing instruction is input,
When the interrupt printing instruction for performing printing on one side of a continuous sheet is input, printing on the first side of the continuous sheet is performed for duplex printing on the continuous sheet by the printing unit based on the preceding job. If the printed continuous sheet is supplied to the reversing unit, the interrupt printing based on the interrupt printing instruction is performed following the printing on the first surface of the continuous sheet based on the preceding job. In addition, a printing control method characterized by causing the printed continuous sheet to be supplied to the reversing unit.   A program that implements each means of the print control apparatus according to any one of claims 1 to 4 or the print control method according to claim 5 by a computer.

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