JP2006164156A - Printer, network connecting device, print control method, and print control program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein, due to increase of a load to a print control system mounted on a network card, a request exceeding the performance of the network card is received, hence the processing time of the request becomes long, and finally a processing impossible situation occurs. <P>SOLUTION: In a processing impossible state, the interval (retry interval) at which the request to the busy response is re-fed is made variable according to the state of the network card. Thus, the vicious circle can be prevented, and the load state can be controlled. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a network print server and a printer control system mounted on a printer device, and more particularly to the print control system.

  In recent years, a print control system having a function of monitoring a network usage state and a function of scheduling print data in addition to a function of managing a network printer in conjunction with a client computer and a print control application has been considered (for example, Patent Document 1).

This print control system controls the order of print requests from client computers, performs job tracking from the start of a print request to the end of printing, and notifies the user of the print status in detail.
Japanese Patent Laid-Open No. 2003-345566

  However, in the control system as described above, request processing from a plurality of users can be performed simultaneously with one network card, but on the other hand, the load on the print control system mounted on the network card is increased. As a result, there is a problem that the request processing time is received, and as a result, the processing time of the request becomes long, or finally, the request cannot be processed.

To deal with this problem, it is considered to notify that when processing is impossible (return a busy response) depending on the situation on the receiving side. Prior to request processing, if a client that has received busy executes a retry (retransmission), the number of requests further increases, resulting in a vicious circle.

  The present invention has been made in order to solve the above-described problems of the prior art. The object of the present invention is to set an interval (retry interval) for executing a retransmission of a request for the busy response when the processing is impossible. It is an object of the present invention to provide a printing apparatus that makes it possible to control a load state by preventing a vicious circle by making it variable according to the state of a network card.

  In order to achieve the above object, another apparatus according to the present invention is an intelligent network card module that can be mounted on a printing apparatus and has a CPU separate from the control module of the printing apparatus, and receives a print request from a client. In a print control system that receives and controls the order, a receiving unit that receives a print request from a client, a management unit that manages registration of a print job according to the print request, and a request reception that receives a request request from the client A means for replying to the client if the request cannot be processed when receiving the request, and a means for calculating the number of connected clients when the request cannot be processed. Means for calculating the retry time from the number of clients having In Shin means, characterized by having a means for transmitting a reply packet containing the retry times calculated by the retry time calculation means.

  In order to achieve the above object, another device according to the present invention further stores, in the print control system according to claim 1, the number of clients notifying that request processing is not possible when the request processing is impossible. Storage means for transmitting, and means for transmitting a reply packet including a value obtained by multiplying the retry time by the number of clients.

  According to the present invention, it is possible to provide a printing apparatus capable of managing a print request without exceeding the upper limit of processing capacity while processing a request from a client.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the constituent elements described in this embodiment are merely examples, and are not intended to limit the scope of the present invention only to them.

(First embodiment)
<System configuration>
FIG. 1 is a block diagram showing the overall configuration of a printing system according to the first embodiment of the present invention. This printing system includes client computers 101 to 103 as information processing apparatuses and network printers 104 and 105 as printing apparatuses, and these are connected to each other to constitute a printing system as a whole.

  The client computers 101 to 103 store a print control program so as to be executable. In addition to managing the network printers 104 and 105 included in the printing system, the client computers 101 to 103 accumulate files used in the network, It has a function to monitor the usage state of the. Specifically, the client computers 101 to 103 create a print job by themselves, issue a schedule request to the scheduler of the network printers 104 and 105, and print data in accordance with an instruction from the scheduler of the network printers 104 and 105. It has a function to start transfer.

  The network printers 104 and 105 are print devices as physical devices that receive print jobs including print data from the client computers 101 to 103, analyze the received print jobs, and print. As the network printers 104 and 105, any type of printing apparatus such as a laser beam printer employing an electrophotographic system, an inkjet printer employing an inkjet system, or a printer utilizing a thermal transfer system can be employed.

  The network printers 104 and 105 accept print requests from a plurality of client computers 101 to 103, determine the order of the accepted print requests, and issue a print instruction. Print transferred to the network printers 104 and 105 It has a function of monitoring the status of jobs and network printers 104 and 105 and notifying the client computers 101 to 103 of the end of printing and printer status.

  Note that the communication between apparatuses included in the printing system may be wired communication using an Ethernet (registered trademark) cable or the like, or wireless communication using radio waves or light.

<Internal configuration of client computers 101-103>
FIG. 2 is a block diagram illustrating a hardware configuration of the client computers 101 to 103 illustrated in FIG.

  In FIG. 2, a CPU 200 reads and executes an application program, a printer driver program, an operation system, a print control program, and the like stored in an HD (hard disk) 205, and stores information, files, and the like necessary for executing the program in a RAM 202. It is a control means for performing control so as to store temporarily.

  The ROM 201 is a storage unit that stores programs such as a basic I / O program, various data such as font data and template data used for document processing. The RAM 202 is temporary storage means that functions as a main memory or work area of the CPU 200.

  The FD (floppy (registered trademark) disk) drive 203 is a storage medium reading means for loading a program or the like stored in the FD 204 as a storage medium into the computer system as shown in FIG. The client computers 101 to 103 may include other storage medium reading means instead of the FD drive 203 or together with the FD drive 203. Examples of the other storage medium include any computer-readable storage medium such as a CD-ROM, CD-R, CD-RW, PC card, DVD, IC memory card, MO, and memory stick.

  The HD 205 is an external storage unit that functions as a large-capacity memory, and stores an application program, a printer driver program, an operation system, a print control program, a related program, and the like. In the client computers 101 to 103, a spooler is secured here. The keyboard 206 is an instruction input unit for a user to input an instruction for a control command or the like. A display 207 is a display unit that displays commands input from the keyboard 206, the status of the network printers 104 and 105, and the like.

  In practice, a display instruction is given to the display means via an operating system running on the client computers 101 to 103, and a resource file display instruction is given to this operating system by the print processing program.

  A system bus 208 controls the data flow in the client computers 101 to 103. The interface 209 is input / output means, and the client computers 101 to 103 exchange data with other devices on the network via the interface 209.

<Explanation of memory map>
FIG. 3 is a diagram illustrating an example of a memory map of the RAM 202 illustrated in FIG. 2, and is a memory map in a state where the print control program is loaded into the RAM 202 and can be executed.

  The print control program and the related data may be installed in advance from the FD 204 to the HD 205 and loaded from the HD 205 into the RAM 202, or may be directly loaded from the FD 204 into the RAM 202 and executed. Furthermore, it is also possible to store the print control program in the ROM 201, configure it as a part of the memory map, and execute it directly by the CPU 200. In addition, software that realizes the same function as each of the above devices can be used as an alternative to a hardware device.

  The print control program controls the client computers 101 to 103 to instruct to transfer print data, instruct to change the print destination of the print job, or to change the print order.

  Reference numeral 301 denotes an area for storing a basic I / O program. The basic I / O program is a program having an IPL (Initial Program Loading) function for starting the operation of the operation system by reading the operation system from the HD 205 into the RAM 202 when the power of the apparatus is turned on. It is.

  An area 302 stores an operating system, and an area 303 stores a print control program. Reference numeral 304 denotes an area for storing related data. A work area 305 is an area for the CPU 200 to execute various programs.

  FIG. 4 is a diagram illustrating an example of a memory map of the FD 204 illustrated in FIG. In FIG. 4, reference numeral 400 denotes data contents of the FD 204, which includes volume information 401 indicating data information, directory information 402, a print control program 403, and related data 404.

  FIG. 5 is a block diagram illustrating the hardware configuration of the printers 104 and 105. The printers 104 and 105 include a network printer server 520 and a printer controller 519 having independent control systems.

  In the network print server 520, reference numeral 501 denotes a network print server CPU. The network print server 520 can communicate with a plurality of external devices (not shown) such as a host computer connected to a local area network (LAN) 512 using a predetermined network communication protocol. For this purpose, the CPU 501 controls various data transmission / reception requests such as print data and printer control commands sent from an external device via a network controller (LANC) 505 connected to the system bus 504 and stored in a rewritable Flash ROM 503. Based on the program, control it centrally. The CPU 501 also performs appropriate data transfer control for the printer controller 519 connected via the expansion interface controller (EXPC) 507.

  A RAM 502 is used as a temporary storage area such as a main memory and work area of the CPU 501. The LED 506 is used as a display unit that indicates the operation state of the network print server. For example, the electrical connection state (LINK) between the network controller 505 and the local area network 512 and the network communication mode (10Base or 100Base, full duplex, half duplex) Various operating states such as double) can be indicated by the blinking pattern and color of the LED.

  The network print server 520 is a network card module as a network connection device, and can be separated from the printer controller 519 through an expansion interface 517. That is, the network print server 520 can be attached to and detached from the printers 104 and 105, and the network print server 520 can be attached to another printer having the same configuration.

  In the printer controller 519, reference numeral 508 denotes a printer controller CPU. The CPU 508 operates based on a control program or the like stored in the ROM 509 or a control program or resource data (resource information) stored in the external memory 510 connected via the disk controller (DKC 515). The CPU 508 comprehensively controls access to various devices connected to the system bus 511. The raster controller 512 generates print data based on the image data received from the network print server 520 and outputs a print image signal to the print engine 516.

  Reference numeral 514 denotes a RAM that functions as a main memory, work area, and the like for the CPU 508. The RAM 514 can be expanded by an optional RAM connected to an expansion port (not shown).

  Reference numeral 518 denotes an operation panel (operation unit) such as a button for setting an operation mode of the network printers 104 and 105, an operation for canceling print data, and a liquid crystal panel or LED indicating the operation state of the network printers 104 and 105. A display is arranged.

  The printer engine 516 may be any printer that uses a known printing technique, such as an electrophotographic method (laser beam method), an inkjet method, a sublimation method (thermal transfer) method, or the like.

  Next, the software configuration of the client computers 101 to 103 will be described. FIG. 6 is a diagram illustrating an example of a software configuration in the client computers 101 to 103. The arrows between the components indicate how a print job including a drawing command issued from an application is processed. The software configuration shown in each block is executed by the CPU 200 in FIG. 2 to realize a desired function.

  In general, when a general application program 601 such as Microsoft Word (registered trademark) receives a printing instruction, it generates a series of drawing commands via the operation system. The PDL driver 602 that has received the drawing command generated via the operation system generates a print job including a PDL file that can be interpreted by the network printers 104 and 105 based on the series of drawing commands. In the following description, a PDL driver will be described as an example. However, the present invention is not limited to this. For example, a BDL (Band description Language), a printer driver that creates a compressed bitmap, or an application and an operation system Thus, the present invention can be applied to a form in which print data is generated without using a printer driver.

  The PDL driver 602 passes the print job to the spooler 603. Here, since the operation system is assumed to be Windows (registered trademark), the spooler 603 is a Windows (registered trademark) spooler. However, the operation system of the computer to which the present invention is applied is not limited to Windows (registered trademark), and it is needless to say that other operation systems such as Unix and Linux can be applied as long as they have drawing commands. .

  The spooler 603 passes the print job to the job control port monitor 604 designated by the user via the user interface (arrow a). In addition, print setting information such as a paper size and a staple instruction set via the printer driver interface is also transmitted to the job control port monitor 604. The job control port monitor 604 transmits these pieces of information to the job control print service 605 (arrow b).

  The job control print service 605 has a function of managing the transferred print job and device status. In addition, a function of managing information such as a device state and a job state notified from the network printers 104 and 105 and a function of giving a predetermined command to the network printers 104 and 105 are also provided. This corresponds to a function for managing device information and job information of a plurality of network printers 104 and 105.

  Before sending the print data to the network printers 104 and 105, a print request is issued to the print job order management function of the network printers 104 and 105. Print data is transmitted to 104 and 105 (arrows c, d, and e).

  Upon confirming the completion of the print data, the network printers 104 and 105 notify the job control print service 605 of the completion of printing (arrow f). In addition, the status of the network printers 104 and 105 is notified (arrow f).

  The print manager 607 is a program that provides a user interface for the user to check the state of the print job in the job control print service 605 and to operate the print job. The print manager 607 exchanges information and instructions with the job control print service 605 via a software interface (API: Application Program Interface) of the job control print service 605.

  It mainly has a function of acquiring status information of the network printers 104 and 105 managed by the job control print service 605 as an event. The type of event notification is normal from the error / warning information notification such as warning that the remaining toner amount is low, communication failure between the client computers 101 to 103 and the device, memory shortage, full discharge tray, etc. Notification of normal information that has returned to the state is assumed. The job control print service 605 has a function of receiving notification of statuses such as a power control state and failure information (paper jam) during printing of each device (printing apparatus) that can communicate via the network.

  More specifically, the print manager 609 issues an event specifying a device to the job control print service 605, and the job control print service 605 recognizes the device status based on the issued event and performs monitoring. Based on the result, the print manager 609 is notified.

<Print job flow>
Next, the flow of a print job from the application 601 to the network printers 104 and 105 will be described with reference to FIG. Here, the same reference numerals are assigned to the same software configurations as those in FIG. 6, and the functions thereof will not be described in detail.

  As shown in FIG. 7, conceptually, a PDL driver 602, a spooler 603, and a job control port monitor 604 are prepared for each of the network printers 104 and 105. In this embodiment, since the operation system is Windows (registered trademark), these are collectively referred to as a Windows (registered trademark) print system 700.

  The job control print service 605 includes a number of print queues 701 a and 701 b and output ports 702 a and 702 b corresponding to the network printers 104 and 105.

  When printing, the application 601 designates a printer and issues a print instruction. When a print job generated by the PDL driver 602 based on this print instruction is transferred from the job control port monitor 604 to the job control print service 605, the print job information is first held in the print queues 701a and 701b, and the output port. A print job reception instruction is issued to 702a. Upon receiving a job to be printed, the output ports 702a and 702b issue a schedule request to the scheduler of the network printer 104 or 105 corresponding to the IP address set for the output port. The schedulers of the network printers 104 and 105 perform scheduling processing for jobs received from the plurality of client computers 101 to 103, and issue print instructions to the output ports 702a and 702b. The output port 702 that has received the print instruction transmits print data to the network printers 104 and 105.

  FIG. 8 is a block diagram illustrating the configuration of the control program stored in each storage device of the network print server 520 and the printer controller 519. Each control program is analyzed and processed by each of the CPUs 501 and 508 of the network print server 520 and the printer controller 519.

  Reference numeral 801 denotes an operating system that controls basic data input / output control of the network print server 520. The operating system 801 includes a file system 805 that performs input / output control with the program / data storage unit 509, an expansion interface driver 807 that performs communication control via the printer controller 519 and the expansion interface 517, and an external device via the LAN 512. A network interface driver 806 that performs communication is included.

  Reference numeral 802 denotes an application program interface (API), which is provided in the operating system for application programs such as a user application 803 operating on the network print server 520, the network printers 104 and 105, and a management application for registering and managing user applications. Provide functionality. The application program interface 802 includes a data transfer API that provides a print data transmission / reception function, a resource control API that controls input / output of resource data such as bitmap images and display messages, restart of the network printers 104 and 105, and setting value setting. Printer control API for controlling initialization, settings, etc., job control API for controlling print job cancellation and reprint instructions, restarting the network print server 520, initializing and setting of setting values, and starting of application programs A print server control API for performing registration and deletion.

  Reference numeral 812 denotes an operating system that supervises various processing controls of the printer controller 519. The print engine control unit 814 that controls communication with the print engine and models such as bitmap images and error messages that are referred to from the network print server 520 It includes a file system 815 that performs input / output control with a dependent resource and a model-dependent resource / program storage unit that stores a model-dependent application program that runs on the network print server.

  Reference numeral 813 denotes an extension interface control unit that controls communication with the network print server 520 via the extension interface 517. Further, the extended interface control unit includes a data transfer logical interface for controlling input / output of print data for each control type, a resource control logical interface for controlling input / output of various data stored in the model-dependent resource / program storage unit 509, a network A printer control logical interface that controls the restart of the printers 104 and 105, initialization of setting values, settings, and the like, and a job control logical interface that controls cancellation of a print job, reprint instruction, and the like are provided. The command requested from the network print server 520 is transferred to the operating system 812, and the processing result is returned to the network print server 520.

  A network control unit 811 receives a notification of reception when the network interface driver 806 receives a notification from the client computers 101 to 103 via the LAN 512. The network control unit 811 determines which client computer has communicated, and controls communication. It is a module that can perform.

  A module 810 controls a protocol for receiving print data transmitted by the client computers 101 to 103, and can pass the received print data to the printer controller 519. The application 803 is stored in the program storage unit 816 of the print controller 519 or the program storage unit 808 of the network print server 520. When the network printers 104 and 105 are activated, the license stored in the program storage unit 808 or in the application stored in the application is compared with the licenses stored in the license storage unit 809, the program storage unit 816, and the license storage unit 817. to decide. If they match, it is determined that the application program is appropriate, and the application program is loaded into the RAM 514 of the network print server 520.

  Next, a software configuration of the device scheduler 900 that is an application executed by the network print server 520 will be described.

  A communication connection management unit 901 manages the connection status of the client computers 101 to 103 to be printed and information to be notified to the client computers 101 to 103, and manages the connected client information in the client management queue. The communication connection management unit 901 communicates with the client computers 101 to 103 via the data transfer API of the program application interface 802 and the network interface driver 806.

  A schedule management unit 902 performs scheduling of print jobs received from the client computers 101 to 103, and includes a job management unit 903 and a device management unit 904.

  A job management unit 903 manages schedule requests issued by the client computers 101 to 103 and jobs printed by the client computers 101 to 103.

  A device management unit 904 receives the printer status of the printer controller 519 and the status of the received print job via the event handler 905. The event received from the printer controller 519 is sent to the communication connection management unit 901 and the job management unit 903. Notice.

  FIG. 10 is a diagram illustrating information managed by the communication connection management unit 901.

  Reference numeral 1002 denotes a client having information such as the client ID assigned by the communication connection management unit 901 for each connected client computer, the IP address of the connected client computers 101 to 103, and the type of event registered by the connected client computers 101 to 103. Information. The event type represents the type of device status event or job status event issued by the printer controller 519.

  A client management queue 1001 holds client information of the connected client computers 101 to 103 in a queue format. When a session with the client computers 101 to 103 is started, the information of the corresponding client computers 101 to 103 is registered in this management queue, and when the session is disconnected, the corresponding client information is deleted.

  FIG. 11 is a diagram showing job information added to a schedule request issued by the client computers 101 to 103 and a job management queue for managing a plurality of generated job information. These pieces of information are managed by the job management unit 903.

  Reference numeral 1102 denotes print job information added to a schedule request issued by the client computers 101 to 103 to start printing. The job information 1102 includes the document name of the print job, the job ID issued by the job management unit 903, the user name that started printing on the client computers 101 to 103, the number of job pages, the job status indicating the status of the print job, the client The job data ID included in the print data transferred by the computers 101 to 103 and the IP addresses of the client computers 101 to 103 that instructed printing are registered.

  The job status represents a status from when the client computer 101 to 103 issues a print schedule request until the job disappears from the printer, such as waiting for printing, schedule-up status, transferring, transferred, printing completed, etc. A state exists.

  The job data ID is an ID of a job included in the print data, and is an ID to be added when a job status in the printer controller 519 is notified.

  Reference numeral 1101 denotes a management queue for managing a plurality of job information 1102. When a schedule request from the client computers 101 to 103 is received, the job information 1102 is registered in the management queue. It is to be deleted.

  FIG. 12 describes the exchange from when the job control print service 605 of the client computer 101 to 103 issues a schedule request to the network printers 104 and 105 after the job is received until the printer finishes printing.

  When receiving the print data, the job control print service 605 starts session connection with the device scheduler 900. Then, a connection request command for notifying information of the client computers 101 to 103, an event registration for notifying the job / device state, and a job list acquisition command for acquiring information of jobs managed by the device scheduler 900 are issued. .

  When the device scheduler 900 accepts a connection request, the device scheduler 900 registers client information in the client management queue 1001, and when accepting event registration, the device scheduler 900 sets it as a registration event of the corresponding client information. When a job list request is received, a list of job information registered in the job management queue 1101 is transmitted.

  Next, the client computers 101 to 103 issue a schedule request command for reserving printing. When the device scheduler 900 receives a schedule request, the device scheduler 900 registers job information in the job management queue 1101. Information such as a document name is set in the job information. The device scheduler 900 issues a schedule up when the network printers 104 and 105 can accept print data, and prompts the job control print service 605 to start sending print data.

  When the schedule up is issued, the job status of the job information 1102 is updated to the schedule up status.

  When the job control print service 605 accepts the schedule up, the job control print service 605 starts transferring the print data to the module 810 (LPD / RAW) that controls the protocol for accepting the print data of the network print server 520. When the transfer starts, the device scheduler 900 Is notified of the transfer start. Upon receiving the transfer start notification, the device scheduler 900 updates the job status of the job information 1102 to a status that is being transferred.

  When the LPD / RAW receives print data, the data is transferred to the printer controller 519, and printing is started by the printer controller 519. The printer controller 519 notifies the device scheduler 900 of the job status when printing is started. The device scheduler 900 notifies the print status of the job to the client computers 101 to 103 based on the registration information of the client information.

  The job control print service 605 transmits a transfer end notification to the device scheduler 900 when transfer of the print data ends. Upon receiving the transfer end notification, the device scheduler 900 updates the job status in the job information 1102 to the transferred status.

  When the printer controller 519 completes the printing process, it notifies the device scheduler 900 of a print completion notification as a job status. The device scheduler 900 notifies the client computers 101 to 103 of the job printing completion status based on the registration information of the client information.

  When the job control print service 605 confirms that the printing is completed by the notification, the device control 900 issues a request for canceling the event notification from the device scheduler 900 because the notification from the device is not necessary. Upon receiving the event notification release request, the device scheduler 900 sets information indicating that the event is not notified to the registered event of the client information.

  Thereafter, the job control print service 605 issues a disconnection request for ending the connection with the device scheduler 900 and ends the session.

  When the device scheduler 900 receives the disconnection request, the device scheduler 900 deletes the corresponding client information from the client management queue 1001 and ends the processing with the client computers 101 to 103.

  FIG. 13 illustrates a process flow of the device scheduler when a request packet from a client is received. Here, differences in processing depending on whether the device scheduler is in a state where request processing can be executed will also be described.

  In step S1301, the device scheduler 900 accepts request requests from the client computers 101-103. Here, the request request indicates all request packets such as a schedule request and a cancel request transmitted from the client computer to the device scheduler 900.

  In step S1302, the device scheduler 900 determines whether the request can be received. If the request is received, the process proceeds to step S1303. If it is not in a receivable state, the process proceeds to step S1304.

  In step S1303, request processing is executed for the schedule request received in step S1301, and the process ends.

  If it is determined in step 1302 that the request cannot be received, the number of clients connected to the device scheduler at that time is calculated in step S1304. In step S1305, a retry time corresponding to the number of clients is calculated. The correspondence between the number of clients and the retry interval will be described later with reference to FIG. In step S1306, a request busy callback including the calculated retry interval is returned to the client, and the process ends.

  Next, the correspondence between the number of connected clients and the retry interval when the device scheduler is in an unreceivable state will be described with reference to FIG.

  FIG. 22 shows the retry interval corresponding to the number of connected clients. For example, when the number of connected clients is between 1 and 10, the retry interval is 1.5 seconds, and when 11 to 20, the correspondence is 2.0 seconds. Thus, based on the number of connected client computers, the retry interval is notified to the request busy client.

  FIG. 14 illustrates processing of the job management unit 903 from reception of a job status notification event from device management to reception of a job list request from the job control print service 605.

  In step S1401, when a notification from the communication connection management unit 901 or the device management unit 904 is received, it is determined whether it is a job status notification from the device management unit 904 or a job list request.

  If it is a job status notification from the device management unit 904, the process proceeds to step S1402, and the job status of the corresponding job information 1102 is updated. Further, the process proceeds to step S1403, and it is determined whether it is a print completion notification. If the printing is not completed, the process proceeds to step S1404, and the connection management unit is notified to issue an event of the job status to the client computers 101 to 103.

  If it is a print completion notification in step S1403, the process proceeds to step S1405 to delete the corresponding job from the job management queue 1101. In step S1406, a job completion event is sent to the connection management unit in the client computers 101 to 103. And the process proceeds to step S1401.

  When a job list request is received from the job control print service 605 in step S1409, connection management is performed so that a list of job information registered in the job management queue 1101 is transmitted to the requesting client computers 101 to 103 in step S1409. Report the job information list to the job.

  FIG. 15 describes a process of the device management unit 904 that receives a device status notification and a job status notification from the printer controller 519 via an event handler and notifies the job management unit 903 and the communication connection management unit 901.

  In step S1501, when the device scheduler 900 is activated, the device management unit 904 changes the device status to the printer controller 519 via the event handler, or the status of the print job processed by the printer controller 519 changes. If so, the event registration process is performed so that the status is notified.

  In step S1502, when an event generated in the printer controller 519 is received via an event handler, it is determined whether the event is a job event or a device event. If the event is a job event, the job management unit 903 is notified of the job event in step S1503, and the process proceeds to step S1502. If the event is a device event, the process proceeds to step S1504, the device state is held in the device management unit 904, the device event is notified to the communication connection management unit 901 in step S1505, and the process proceeds to step S1502. .

  FIG. 16 describes a processing flow of the communication connection management unit 901 that processes requests and notifications from the client computers 101 to 103, notifications from the device management unit 904, and requests and notifications to the job management unit 903.

  In step S1601, notifications and requests from the client computers 101 to 103, the device management unit 904, and the job management unit 903 are received, and which notification or request is determined.

  If the request or event received in step S1601 is a connection request from the client computers 101 to 103, the process proceeds to step S1602, and the client ID issued by the communication connection management unit 901 to the client management queue 1001 and the client that issued the request The IP addresses of the computers 101 to 103 are set, and client information is registered in the client management queue 1001.

  If the request or event received in step S1601 is event registration from the client computers 101 to 103, the process proceeds to step S1603, and the type of event notified to the registration event of the corresponding client information is set. The event types include a job event that notifies a change in the job state and a device event that notifies a change in the device state.

  If the request or event received in step S1601 is a device event from the device management unit 904 or a job event from the job management unit 903, in step S1604, the client computers 101 to 103 to be notified of these events are recognized. Then, from all the client information registered in the client management queue 1001, it is determined whether or not to notify by referring to the setting of the registration event of the client information. If it is determined that notification should be made, the IP addresses of the client computers 101 to 103 are held, and an event is transmitted to all the client computers 101 to 103 to be notified in step S1705.

  If the request or event received in step S1601 is a disconnection request from the client computers 101 to 103, the process proceeds to step S1606, and the client information of the corresponding client computers 101 to 103 is deleted from the client management queue 1001.

  FIG. 17 shows print job information managed by the job control print service 605 and a job management queue for managing information on a plurality of jobs.

  Reference numeral 1702 denotes job information printed by the own client computer and job information of a print job of another client computer notified when a job event is registered in the device scheduler 900. The job information 1702 includes the document name of the print job, the job ID, the name of the user who started printing on the client computer, the number of pages of the job, the job status indicating the status of the print job, and the job data ID included in the print data. .

  The job status represents the status from when the client computers 101 to 103 start printing until the job disappears from the printer, such as spooling, waiting for printing, schedule-up status, transferring, transferring completed, printing completed, etc. A state exists.

  The job data ID is an ID of a job included in the print data, and is information set in a job event from the device scheduler 900.

  Reference numeral 1701 denotes a management queue for managing a plurality of job information 1702, in which job information of jobs printed by the own client computer and job information of other client computers notified from the device scheduler 900 are registered.

  FIG. 18 shows information on printer queues and output ports managed by the job control print service 605.

  Reference numeral 1801 denotes information on each printer queue managed by the job control printer service, and includes information such as a printer name.

  Reference numeral 1802 denotes information on each output port managed by the job control printer service, and includes information such as an IP address of a device to be printed.

  FIG. 19 shows the flow of the printing process shown in FIG. 12 from when the job control print service 605 of the client computers 101 to 103 receives the print data until the print data is transferred.

  In step S1901, it is determined whether a print job is received from the job control port monitor or a schedule up command for instructing start of print data transfer is received from the device scheduler 900. The process proceeds to step S1902 for receiving a print job from the job control port monitor, and when a schedule up command is received, the process proceeds to step S1906.

  In step S1902, the received print job information is set in the job information 1702 and registered in the job management queue 1701.

  Information set in the job information 1702 can be acquired from the print system or can be acquired by analyzing print data.

  Next, in step S1903, connection is made to the device scheduler 900 and a connection request command is issued. When the client computers 101 to 103 issue connection requests, the information of the client computers 101 to 103 is registered in the client management queue 1001 of the device scheduler 900, and thereafter, information is exchanged between the client computers 101 to 103 and the device scheduler 900. be able to.

  In step S1904, a job event and a device event are registered in the device scheduler 900. When a job event is registered, the device scheduler 900 notifies a change in the status of a job printed by the own client computer or a job printed by another client computer. When a device event is registered, a change in the status of the network printers 104 and 105 is notified.

  In step S1905, a list of jobs registered in the job management queue 1101 managed by the device scheduler 900 is acquired. With this job list and job event, it is possible to grasp the print status of a job managed by the device scheduler 900.

  With the above processing, preparation for printing is completed, registration of a job to be printed is registered in the device scheduler 900 in step S1906, and a next instruction is waited for in step S1901.

  In step S1901, when a schedule up command, which is a print data transfer instruction, is received from the device scheduler 900, the process proceeds to step S1907. In step S1907, transfer of a job that has received a print instruction is started.

  When transmission of print data is started, a transfer start state is notified in step S1908 to notify the device scheduler 900 that transfer has started.

  When the transfer of the print data is completed in step S1909, the device scheduler 900 is notified that the transfer has been completed in step S1910.

  FIG. 20 illustrates a processing flow of the job control print service 605 when a notification or command from the device scheduler 900 is received.

  In step S2001, it is determined whether a job event notification or a job list is returned from the device scheduler 900. When a job event comes, the process proceeds to step S2002, and when a job list comes, the process goes to step S2008. Migrate processing.

  In step S2008, when the job list is returned, the job information obtained from the job list is set in the job management queue 1701 managed by the job control print service 605.

  In step S2002, it is determined whether the job event notification notified from the device scheduler 900 is a job completion notification or a job status change notification. If the job status notification is a job status change notification, the corresponding job is determined in step S2009. Update job status in information.

  If the received event notification is a job completion notification in step S2002, the corresponding job information is deleted from the job management queue 1701 in step S2003.

  In step S2004, it is checked whether a job of the client computer that has not finished printing remains in the job management queue 1701, and if it remains, it is still necessary to exchange with the device scheduler 900. In order to continue the connection with the scheduler 900, the process proceeds to step S2001.

  If there is no job of the own client computer in step S2004, the process proceeds to step S2005, and a process for terminating the connection with the device scheduler 900 is started.

  In step S2005, a request is made to cancel registration of the job event and device event registered in the device scheduler 900 when connection is started. In response to this request, the device scheduler 900 deletes the event registration contents of the client information. Without this event registration information, no event is notified even if the status of the job managed by the device scheduler 900 changes.

  In step S2006, a disconnection request is issued to the device scheduler 900. When the device scheduler 900 receives the disconnection request, the corresponding client information is deleted from the client management queue 1001.

  In step S2007, a process for disconnecting the session with the device scheduler 900 is performed, and the process waits in step S2001.

  In this way, when a request is received from a client computer, it is determined whether the request can be received, a request busy is returned in response to the request, and a retry interval (retransmission) is specified by specifying a retry interval in the reply packet. ) Can prevent a vicious circle in which requests increase.

  In the present embodiment, the network printer to which the network card can be attached and detached has been described. However, the present invention is not limited to this, and can be applied to a network printer in which the function of the network card is installed.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the first embodiment described above, a process when the number of clients to which a request busy response is returned becomes plural will be described.

  FIG. 21 describes the process flow of the device scheduler when a request packet from a client is received. Here, a process when the number of clients returning a request busy packet becomes plural will be described.

  In step S2101, the device scheduler 900 accepts request requests from the client computers 101-103. Here, the request request indicates all request packets such as a schedule request and a cancel request transmitted from the client computer to the device scheduler 900.

  In step S2102, it is determined whether the request can be received. If the request can be received, the process proceeds to step S2103. If not, the process proceeds to step S2105.

  In step S2103, the number of clients returning a busy response is initialized (set to 0), the process proceeds to step S2104, the received request is processed, and the process ends.

  In step S2105, the number of clients returning a busy response is incremented by 1 (BusyClientNum ++), and in step S2106, the number of clients connected to the device scheduler at that time is calculated. In step S2107, a retry time corresponding to the number of clients is calculated. In step S2108, the calculated retry interval is multiplied by the number of clients (BusyClientNum) required by returning a busy response. In step S2109, a request busy callback including the value obtained in step S2108 is sent to the client. Reply and finish the process.

  In this way, when a request is received from a client computer, it is determined whether the request can be received, a request busy is returned in response to the request, and a retry interval (retransmission) is specified by specifying a retry interval in the reply packet. ) Can prevent a vicious circle in which requests increase. Furthermore, it is possible to specify a retry interval more suitable for the situation by multiplying the retry interval in accordance with the number of clients returning a busy request.

1 is a block diagram illustrating an overall configuration of a printing system as an embodiment of the present invention. It is a block diagram explaining the hardware constitutions of the client computers 101-103. It is a figure which shows an example of the memory map of RAM202 shown in FIG. FIG. 3 is a diagram illustrating an example of a memory map of the FD 204 illustrated in FIG. 2. FIG. 2 is a block diagram illustrating a hardware configuration of a printer. 2 is a diagram illustrating an example of a software configuration of a printing system of client computers 101 to 103. FIG. FIG. 3 is a diagram illustrating a flow of a print job when printing by client computers 101 to 103. 2 is a diagram illustrating an example of a software configuration of a printer. FIG. FIG. 3 is a diagram illustrating an example of a software configuration of a user application of a printer. 6 is a diagram illustrating client information and a client management queue managed by a device scheduler 900. FIG. 6 is a diagram illustrating job information and a job management queue managed by a device scheduler 900. FIG. 5 is a diagram illustrating a print sequence between a job control print service, a device scheduler 900, an LPD / RAW, and a printer controller 519. FIG. It is a flowchart which shows the flow of a process of a device scheduler when the request packet from a client is received. 10 is a flowchart illustrating processing from job status notification event reception to job list request reception by a job management unit 903; 6 is a flowchart illustrating processing of a device management unit when a device status and job status notification from a printer controller 519 is received. 10 is a flowchart illustrating processing of a communication connection management unit 901 that processes requests and notifications from client computers 101 to 103, notifications from a device management unit, and requests and notifications to a job management unit 903. FIG. 6 is a diagram illustrating print job information and a job management queue managed by a job control print service. FIG. 6 is a diagram illustrating information on printer queues and output ports managed by a job control print service. 6 is a flowchart illustrating a flow from reception of print data by the job control print service to transfer of the print data. 6 is a flowchart showing a flow of processing of a job control print service when a notification or command from a device scheduler 900 is received. It is a flowchart which shows the flow of a process of a device scheduler when the request packet from a client is received. It is a table | surface which shows the number of connected client computers, and the retry interval corresponding to it.

Claims (2)

In an intelligent network card module equipped with a CPU separate from the control module of the printing apparatus that can be mounted on the printing apparatus, in a print control system that receives a print request from a client and performs order control,
Receiving means for receiving a print request from a client;
Management means for managing the registration of print jobs in accordance with the print request;
A request receiving means for receiving a request from a client;
If the request cannot be processed at the time of receiving the request, a reply means for returning that to the client,
A calculation means for calculating the number of connected clients when the request cannot be processed;
Means for calculating the retry time from the number of connected clients;
A printing apparatus and a print control system, characterized in that the reply means includes means for transmitting a reply packet including the retry time calculated by the retry time calculation means. The print control system according to claim 1, further comprising: a storage unit that stores the number of clients notifying that request processing is not possible when the request processing is impossible; and the retry time is multiplied by the number of clients. A printing apparatus and a printing control system.

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