Patent Publication Number: US-8976394-B2

Title: Printing system and control method using first and second user interfaces

Description:
This is a continuation of U.S. patent application Ser. No. 12/954,291, filed Nov. 12, 2010. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a printing system that includes a printing apparatus, a post-processing apparatus, and a control method thereof. 
     2. Description of the Related Art 
     In recent years, a print-on-demand (POD) printing system has been proposed that includes an electrophotographic or inkjet printing apparatus and a post-processing apparatus, and that performs a bookbinding process on sheets that have been printed by the printing apparatus (U.S. Publication No. 2004-0190057). With this sort of POD printing system, printing plate making processes and other complicated tasks essential for a conventional bookbinding process can be significantly reduced. 
     This sort of printing system has an in-line mode where a printing process by a printing apparatus and a post-process on sheets that have been printed in the printing process are performed successively and an off-line mode in which only a post-process is performed without the involvement of a printing process by a printing apparatus. A system has also been proposed in which, in this off-line mode, where a second user interface provided on the post-processing apparatus, and not a first user interface provided on the printing apparatus, is used to perform a post-process on sheets set in a paper feed unit (Japanese Patent Laid-Open No. 2004-145200). 
     However, the above-described POD printing system still has many problems in terms of practicability. For example, it is desirable that the first user interface of the printing apparatus can instruct a post-process both in the in-line mode and the off-line mode. Furthermore, it is necessary that the post-process instructed by the first user interface is properly controlled according to whether the process is a process in the in-line mode or a process in the off-line mode. 
     Meanwhile, it is desirable that the second user interface of the post-processing apparatus can instruct at least one of post-processes in the off-line mode that can be instructed by the first user interface. Furthermore, it is necessary that control is properly performed such that a post-process in the off-line mode instructed by the first user interface and that by the second user interface do not conflict with each other. 
     Moreover, it is desirable that, even when the printing apparatus cannot be used due to power constraint or any other troubles, the second user interface of the post-processing apparatus can be used to perform a post-process by instructing that post-processing apparatus to perform the post-process. 
     SUMMARY OF THE INVENTION 
     An aspect of the present invention is to eliminate the above-mentioned problems with the conventional technology. 
     The present invention provides a printing system in which a first user interface of a printing apparatus can instruct post-processes both in the in-line mode and the off-line mode, and a second user interface of a post-processing apparatus can instruct at least one of post-processes in the off-line mode that can be instructed by the first user interface, and a control method thereof. 
     The present invention in its first aspect provides a printing system including a printing apparatus and a post-processing apparatus, comprising an off-line job execution unit configured to execute an off-line job in which a post-process by the post-processing apparatus is performed without printing by the printing apparatus; an in-line job execution unit configured to execute an in-line job in which printing by the printing apparatus and a post-process by the post-processing apparatus are performed; a first user interface configured to receive a request to execute the in-line job and the off-line job; and a second user interface provided on the post-processing apparatus, which is different from the first user interface, configured to receive an off-line job using the post-processing apparatus; wherein the first user interface is provided on the printing apparatus. 
     The present invention in its second aspect provides a method for controlling a printing system including a printing apparatus and a post-processing apparatus, comprising the steps of executing an off-line job in which only a post-process by the post-processing apparatus is performed without involvement of printing by the printing apparatus; executing an in-line job in which printing by the printing apparatus and a post-process by the post-processing apparatus are performed; receiving a request to execute the in-line job and the off-line job; and receiving an off-line job using the post-processing apparatus. 
     According to the present invention, the first user interface of the printing apparatus can instruct post-processes both in the in-line mode and the off-line mode. Furthermore, the second user interface of the post-processing apparatus can instruct at least one of post-processes in the off-line mode that can be instructed by the first user interface. 
     Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a view showing the configuration of a POD system according to this embodiment. 
         FIG. 2  is a block diagram showing the configuration of a printing system according to this embodiment. 
         FIG. 3  is a cross-sectional view showing the configuration of the printing system according to this embodiment. 
         FIG. 4  is an external view of an operation unit of the printing apparatus. 
         FIG. 5  is a view showing a display example of a setting screen for enabling the user to select the type of a sheet process. 
         FIG. 6  is a view showing a display example of a setting screen of the type of a sheet process in the off-line job. 
         FIG. 7  is a view showing an example of a user interface provided in a saddle stitching apparatus. 
         FIG. 8  is a block diagram showing the configuration of the saddle stitching apparatus according to this embodiment. 
         FIG. 9  is a flowchart illustrating an operation of a sheet process in the in-line job. 
         FIG. 10  is a flowchart illustrating a process in the off-line job according to this embodiment. 
         FIG. 11  is a flowchart of a sheet process in the off-line job using a second UI. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     Preferred embodiments of the present invention will now be described hereinafter in detail, with reference to the accompanying drawings. It is to be understood that the following embodiments are not intended to limit the claims of the present invention, and that not all of the combinations of the aspects that are described according to the following embodiments are necessarily required with respect to the means to solve the problems according to the present invention. 
     The same constituent elements are denoted by the same reference numerals, and a description thereof has been omitted. 
       FIG. 1  is a view showing the configuration of a POD system according to this embodiment. 
     A POD system  10000  has printing systems  1000  and  1001 , a scanner  102 , a server computer  103  (PC  103 ), and a client computer  104  (PC  104 ), and these constituent elements are connected via a network  101 . Furthermore, the POD system  10000  has a sheet folding apparatus  107 , a case binding apparatus  108 , a trimmer  109 , a saddle stitching apparatus  110 , and the like. 
     The PC  103  manages data exchanges among the various apparatuses connected to the network  101 . The PC  104  transmits image data via the network  101  to the printing systems  1000  and  1001  and the PC  103 . 
     Furthermore, the sheet folding apparatus  107  performs a folding process on printed sheets. The case binding apparatus  108  performs a case binding process on printed sheets. The trimmer  109  performs a cutting process on printed sheets for each bundle of sheets constituted by a plurality of sheets. The saddle stitching apparatus  110  performs a saddle stitching process on printed sheets. 
     When using the sheet folding apparatus  107 , the case binding apparatus  108 , the trimmer  109 , or the saddle stitching apparatus  110 , a user takes out sheets that have been printed by the printing system  1000  or the printing system  1001 , sets the sheets in any one of these apparatuses that is to be used, and causes the apparatus to perform the process. Furthermore, among the plurality of apparatuses included in the POD system  10000 , apparatuses other than the saddle stitching apparatus  110  are connected to the network  101 , and are configured to be capable of data communication with each other. 
     Here, the printing system  1001  is equipped with the same configuration as that of the printing system  1000 , but this is not a limitation. Furthermore, the configuration of this embodiment can be achieved if at least one of the printing systems is present. In this embodiment, it is assumed that at least the printing system  1000  has various constituent elements described below. 
       FIG. 2  is a block diagram showing the configuration of the printing system  1000  ( 1001 ) according to this embodiment. Here, the case of the printing system  1000  will be described, but the printing system  1001  also has a similar configuration. 
     The printing system  1000  has a printing apparatus  100  and a sheet processing apparatus  200 . Here, in this embodiment, a multi function peripheral (MFP) having multiple functions such as a copy function and a printer function will be described as an example of the printing apparatus  100 . However, the printing apparatus  100  may be a single-function printing apparatus having only a copy function or only a printer function. 
     The printing apparatus  100  can be connected to any number of sheet processing apparatuses  200 . The printing system  1000  is configured so that a sheet process on sheets that have been printed by the printing apparatus  100  can be performed by the sheet processing apparatus  200  connected to the printing apparatus  100 . Here, it is also possible for the printing system  1000  to be configured only from the printing apparatus  100 , without being connected to the sheet processing apparatus  200 . The sheet processing apparatus  200  is configured to be capable of communication with the printing apparatus  100 , and can perform a sheet process as described later upon receiving instructions from the printing apparatus  100 . 
     Next, the configuration of the printing apparatus  100  will be described. A scanner unit  201  reads images on documents, converts the images to image data, and then transfers the image data to other units. An external I/F  202  performs data exchanges with other apparatuses connected to the network  101 . A printer unit  203  prints images on sheets based on input image data. An operation unit  204  has a hard key input section (key input section) and a touch panel section (described later), and receives instructions from the user via these sections. The operation unit  204  performs various displays on the touch panel section. 
     A control unit  205  has a CPU  205   a , and comprehensively controls, for example, the processes and operations of the various units included in the printing system  1000 . That is to say, it controls the operations of both the printing apparatus  100  and the sheet processing apparatus  200  connected to the printing apparatus  100 . A ROM  207  stores various computer programs to be executed by the control unit  205 . For example, the ROM  207  stores programs for causing the control unit  205  to execute various processes of flowcharts (described later), and display control programs necessary for displaying various setting screens (described later). Furthermore, the ROM  207  stores a program for executing an operation in which page description language (PDL) code data received from the PC  103 , the PC  104 , or the like is interpreted by the control unit  205  and developed into raster image data. Additionally, the ROM  207  stores a boot sequence, font information, and the like. A RAM  208  stores image data transmitted from the scanner unit  201  and the external I/F  202 , and various programs and setting information loaded from the ROM  207 . Furthermore, the RAM  208  stores information relating to the sheet processing apparatus  200  (information relating to the number (0 to n) of sheet processing apparatuses  200  connected to the printing apparatus  100  and functions of each of the sheet processing apparatuses  200 , the connection sequence of the sheet processing apparatuses  200 , and the like). A hard disk drive (HDD)  209  is configured from a hard disk and drive units or the like reading and writing data from and to the hard disk. The HDD  209  is a large capacity storage device capable of storing image data that has been input from the scanner unit  201  or the external I/F  202  and compressed by a compression-decompression (CODEC) unit  210 . Based on instructions from the user, the control unit  205  can cause the printer unit  203  to print image data stored in the HDD  209 . Furthermore, based on instructions from the user, the control unit  205  can transmit image data stored in the HDD  209  via the external I/F  202  to the PC  103  or other external apparatuses of the printing system  1000 . Furthermore, the control unit  205  can obtain image data from the PC  103  or other external apparatuses of the printing system  1000  via the external I/F  202  in a similar manner. Furthermore, via the external I/F  202 , the control unit  205  can search external apparatuses connected to the network  101 . The compression-decompression unit  210  performs compression and decompression operations on image data and the like stored in the RAM  208  and the HDD  209  using various compression formats such as JBIG and JPEG. 
       FIG. 3  is a cross-sectional view showing the configuration of the printing system  1000  according to this embodiment. 
     An auto document feeder (ADF)  301  sequentially separates a bundle of documents that have been set on a loading face of a document tray, in page order from the first page of document, and transports these documents onto a document platen glass so that a scanner  302  scans the documents. The scanner  302  reads images of the documents that have been transported onto the document platen glass, and converts the images to image data using a CCD. These constituent elements correspond to the scanner unit  201 . 
     Next, the configuration of the printer unit  203  will be described. A light beam such as laser light modulated according to image data is made incident on a rotating multifaceted mirror (polygon mirror, etc.)  303 , and irradiated via a reflection mirror onto a photosensitive drum  304  as a reflected scanning light. An electrostatic latent image formed by this light beam on the photosensitive drum  304  is developed with a toner, and a toner image is transferred to a sheet material sticking onto a transfer drum  305 . A full color image is formed by successively performing this series of image formation processes for toner of yellow (Y), magenta (M), cyan (C), and black (K). After the four times of these image formation processes, the sheet material on the transfer drum  305  on which a full color image has been formed is separated by a separation pawl  306 , and transferred by a pre-fixing transportation unit  307  to a fixing unit  308 . The fixing unit  308  is configured from a combination of rollers and a belt, includes an inbuilt heat source such as a halogen heater, and uses heat and pressure to melt and fix the toner on the sheet material to which the toner image has been transferred. A discharge flapper  309  is configured to be capable of swinging about a swinging shaft to prescribe a transport direction of the sheet material. When the discharge flapper  309  has swung in a clockwise direction in the diagram, the sheet material is transported in a straight line and discharged outside the apparatus by discharge rollers  310 . Through the series of sequences as described above, the control unit  205  controls the printing apparatus  100  so as to perform single-sided printing. 
     Meanwhile, when forming images on both sides of a sheet material, the discharge flapper  309  swings in a counterclockwise direction in the diagram such that the route of the sheet material is altered downward and the sheet material is transported into a double-sided transportation unit. The double-sided transportation unit is provided with a reversing flapper  311 , reversing rollers  312 , a reversing guide  313 , and a double-sided print tray  314 . The reversing flapper  311  swings about a swinging shaft to prescribe a transport direction of the sheet material. When processing a double-sided print job, the control unit  205  performs control such that a sheet on which printing has been performed on a first side thereof is transported via the reversing rollers  312  to the reversing guide  313  by swinging the reversing flapper  311  in a counterclockwise direction in the diagram. Then, the reversing rollers  312  are temporarily stopped in a state where the trailing edge of the sheet material is held between the reversing rollers  312 , and the reversing flapper  311  is then swung in the clockwise direction in the diagram. Moreover, the reversing rollers  312  are rotated in a reverse direction. Accordingly, control is performed such that the sheet is switched back, and guided to the double-sided print tray  314  in a state where the trailing edge and the leading edge of that sheet are swapped. The sheet material is temporarily stacked in the double-sided print tray  314 , and then transported by paper re-feed rollers  315  into registration rollers  316 . At that time, the sheet material is transported in a state where a side opposite the first side in the previous transfer process faces the photosensitive drum  304 . Then, a second image is formed on the second side of the sheet as in the above described process. In this manner, images are formed on both sides of the sheet material, and, after the fixing process, the sheet material is discharged via the discharge rollers  310  from inside the main unit of the printing apparatus  100  to outside the apparatus. Through the series of sequences as described above, the control unit  205  controls the printing apparatus  100  so as to perform double-sided printing. 
     Furthermore, the printing apparatus  100  has paper feed units that accommodate sheets required for a printing process. The paper feed units include paper feed cassettes  317  and  318  (e.g., each of these can accommodate 500 sheets), a paper feed deck  319  (e.g., this can accommodate 5000 sheets), a manual feed tray  320 , and the like. Various sheets of different sizes and materials can be separately set in each paper feed unit of the paper feed cassettes  317  and  318  and the paper feed deck  319 . Furthermore, various sheets including special sheets such as OHP sheets can be set in the manual feed tray  320 . Each of the paper feed cassettes  317  and  318 , the paper feed deck  319 , and the manual feed tray  320  is provided with paper feed rollers, and the sheets are successively transported by the paper feed rollers sheet by sheet. 
     Next, the sheet processing apparatuses  200  shown in  FIG. 3  will be described. As the sheet processing apparatus  200  in the printing system  1000  of this embodiment, any number of any types of apparatuses can be linked as long as sheets can be transported via a sheet transport path from an upstream apparatus to a downstream apparatus. For example, as shown in  FIG. 3 , a large volume stacker  200 - 3   a , an inserter  200 - 3   d , a glue binding apparatus  200 - 3   b , and a saddle stitching apparatus  200 - 3   c  can linked in order of proximity to the printing apparatus  100 , and each of these apparatuses can be used selectively in the printing system  1000 . Furthermore, each of the sheet processing apparatuses  200  is provided with a sheet discharge unit, and the user can take out sheets on which the sheet process has been performed, from the sheet discharge unit of each of the sheet processing apparatuses. 
     From candidates of types of sheet processes that can be performed by the sheet processing apparatus  200  connected to the printing apparatus  100 , the control unit  205  receives an execution request for a type of a sheet process desired by the user together with a printing execution request via the operation unit  204 . Then, in response to receiving from the user via the operation unit  204  the printing execution request for a processing target job, the control unit  205  causes the printer unit  203  to perform a printing process required for that job. Then, the control unit  205  transports sheets for the job on which the printing process has been performed via the sheet transport path to a sheet processing apparatus that can perform the sheet process desired by the user, and causes that sheet processing apparatus to perform the sheet process. 
     For example, it is assumed that, in the case where the printing system  1000  is configured as the system shown in  FIG. 3 , the processing target job for which a printing execution request has been received from the user is a job in which a large volume stacking process is to be performed using the large volume stacker  200 - 3   a . This job is referred to as a “stacker job”. When processing the stacker job using the system configuration in  FIG. 3 , the control unit  205  causes sheets for this job that have been printed by the printing apparatus  100  to pass a point A in  FIG. 3 , and then to be transported into the large volume stacker  200 - 3   a . Subsequently, the control unit  205  causes the large volume stacker  200 - 3   a  to perform a stacking process on the sheets for this job. Then, the control unit  205  causes a discharge destination X inside the large volume stacker  200 - 3   a  to hold the sheets (printed materials) that have been stacked by the large volume stacker  200 - 3   a , without transporting them to other apparatuses (e.g., apparatuses in following stages). The user can directly take out the printed materials for the stacker job that have been held at the discharge destination X, from the discharge destination X. This makes unnecessary a series of apparatus operations and user operations that transport the sheets to a most downstream discharge destination Z in the sheet transport direction of  FIG. 3 , and take out the printed materials from the discharge destination Z. 
     Furthermore, it is assumed that, in the system configuration in  FIG. 3 , the processing target job for which a printing execution request has been received from the user is a job in which a sheet process is instructed to be performed using the glue binding apparatus  200 - 3   b  (e.g., a glue binding process of either a case binding process or a pad binding process). This job is referred to as a “glue binding job”. When processing the glue binding job using the system configuration in  FIG. 3 , the control unit  205  causes the sheets that have been printed by the printing apparatus  100  to be transported via the point A, a point A′, and a point B in  FIG. 3  into the glue binding apparatus  200 - 3   b . Subsequently, the control unit  205  causes the glue binding apparatus  200 - 3   b  to perform a glue binding process in this job. Then, the control unit  205  causes a discharge destination Y inside the glue binding apparatus  200 - 3   b  to hold the printed materials on which the glue binding process has been performed by the glue binding apparatus  200 - 3   b , without transporting them to other apparatuses (e.g., apparatuses in following stages). 
     Moreover, for example, it is assumed that the processing target job for which a printing execution request has been received from the user is a job in which a sheet process is instructed to be performed using the saddle stitching apparatus  200 - 3   c . Examples of the sheet process using the saddle stitching apparatus  200 - 3   c  include saddle stitching, a punching process, a cutting process, a shift discharge process, a folding process, and the like. Here, this job is referred to as a “saddle stitching job”. When processing the saddle stitching job using the system configuration in  FIG. 3 , the control unit  205  causes the sheets for this job that have been printed by the printing apparatus  100  to pass the point A, the point A′, the point B, and a point C, and then to be transported into the saddle stitching apparatus  200 - 3   c . Subsequently, the control unit  205  causes the saddle stitching apparatus  200 - 3   c  to perform a sheet process in this job. Then, the control unit  205  causes the discharge destination Z of the saddle stitching apparatus  200 - 3   c  to hold the printed materials for the saddle stitching job on which the sheet process has been performed by the saddle stitching apparatus  200 - 3   c . Here, the discharge destination Z has a plurality of discharge destination candidates. This enables the saddle stitching apparatus  200 - 3   c  to perform a plurality of types of sheet processes and use different discharge destinations for the respective sheet processes. 
     Moreover, for example, it is assumed that, in this system, the processing target job for which a printing execution request has been received from the user is a job in which a sheet process is instructed to be performed using the inserter  200 - 3   d . This job is referred to as an “inserter paper feed job”. This inserter paper feed job can also use sheet processing apparatuses that are connected downstream thereof. Here, a case will be considered in which the inserter paper feed job is processed using the system in  FIG. 3 . In this case, the control unit  205  inserts sheets fed from the inserter  200 - 3   d  into the sheets for this job that have been printed by the printing apparatus  100 , and then transports the sheets to the sheet processing apparatus according to a designated sheet process. Then, the sheet process is performed. In  FIG. 3 , the glue binding apparatus  200 - 3   b  and the saddle stitching apparatus  200 - 3   c  are connected downstream of the inserter  200 - 3   d . Thus, a glue binding job and a saddle stitching job can be performed on sheets into which the sheets fed from the inserter  200 - 3   d  have been inserted. Furthermore, the inserter paper feed job does not necessarily require printing in the printing apparatus  100 . That is to say, it is possible to transport only the sheets fed from the inserter  200 - 3   d  to the downstream, and perform a sheet process thereon using a designated sheet processing apparatus. 
     As described above, the printing system  1000  of this embodiment enables a plurality of sheet processing apparatuses to be connected to the printing apparatus  100 . These plurality of sheet processing apparatuses can be connected to the printing apparatus  100  in any combination. The connection sequence of these plurality of sheet processing apparatuses can be freely changed as long as the sheet transport paths between the apparatuses are linked. Furthermore, there are a plurality of types of candidate sheet processing apparatuses that can be connected to the printing apparatus  100 . 
       FIG. 4  is an external view of the operation unit  204  of the printing apparatus  100 . 
     The operation unit  204  is provided with a touch panel section  401  and a key input section  402 . The touch panel section  401  is provided with a liquid crystal display and a transparent electrode attached thereon, and displays various setting screens for receiving instructions from the user. The touch panel section  401  is provided with both a function of displaying various screens and an instruction input function of receiving instructions from the user. The key input section  402  is provided with an on/off key  501 , a start key  503 , a stop key  502 , a user mode key  505 , and a numeric keypad  506 . The start key  503  is used when causing the printing apparatus  100  to start a copying job or a transmission job. The numeric keypad  506  is used when performing settings of numerical input of the number of prints or the like. Here,  604  denotes a key for instructing an off-line process. Furthermore,  609  denotes a key for performing settings of a sheet process. The control unit  205  controls the printing system  1000  such that various processes are performed based on user instructions received via the various screens displayed on the touch panel section  401  and user instructions received via the key input section  402 . 
       FIG. 5  is a view showing a display example of a setting screen for enabling the user to select the type of a sheet process to be performed on the sheets that have been printed by the printing apparatus  100 . This screen is displayed on the touch panel section  401  when the sheet process setting key  609  displayed on the touch panel section  401  is pressed by the user. 
     The screen in  FIG. 5  is a setting screen configured so that the user can select the type of a sheet process that can be performed using the sheet processing apparatus  200  included in the printing system  1000 . Upon receiving from the user via this screen the settings of the sheet process to be performed for the processing target job, the control unit  205  can cause the sheet processing apparatus  200  to perform the sheet process according to these settings. Here, in the case where the sheet processing apparatuses  200  are connected to the printing apparatus  100 , a configuration may be adopted in which an operator can register information for specifying, for example, how many and what type of sheet processing apparatuses are to be connected in which sequence. For example, a case will be considered in which the printing system  1000  is configured as shown in  FIG. 3 . At that time, registration information is set indicating that the four sheet processing apparatuses consisting of the large volume stacker  200 - 3   a , the inserter  200 - 3   d , the glue binding apparatus  200 - 3   b , and the saddle stitching apparatus  200 - 3   c  are connected to the printing apparatus  100  in the order as shown in the drawing. The control unit  205  holds information relating to the sheet processing apparatuses  200  set by the operator in the RAM  208  as system configuration information, and reads out and references the information as required. Accordingly, the control unit  205  can see how many and what type of sheet processing apparatuses are to be connected in which connection sequence to the printing apparatus  100 . 
     Here, it is assumed that the user has performed a setting in which a saddle stitching apparatus  200 - 3   c  not having a straight path is connected among a plurality of sheet processing apparatuses. In this case, the control unit  205  causes an error display to be displayed on the touch panel section  401  in order to give notification to the effect that this setting is invalid. Furthermore, the control unit  205  may also cause guidance information to be displayed notifying the operator to connect the saddle stitching apparatus  200 - 3   c  at the endmost of the sequence without performing such a setting. 
     Next, various types of control performed by the control unit  205  according to this embodiment for the printing system  1000  will be described below. Here, the printing system  1000  is provided with the printing apparatus  100  having the printer unit  203  capable of performing a printing process of data in the HDD  209  that can store data of a plurality of jobs. Furthermore, the printing system  1000  is configured so that the printing apparatus  100  and a plurality of sheet processing apparatuses  200  can be connected. Each of these sheet processing apparatuses  200  is configured so that the operator can take out printed materials on which a sheet process has been performed by that apparatus, from the apparatus. Furthermore, the configuration is adopted in which sheets that have been set in the paper feed deck of the inserter  200 - 3   d , which is one of the sheet processing apparatuses  200 , can be selectively supplied from the inserter  200 - 3   d  to a plurality of sheet processing apparatuses  200 . Furthermore, the printing system  1000  of this embodiment is configured so that sheets for a job on which printing has been performed by the printer unit  203  can be selectively supplied from the printer unit  203  to the plurality of sheet processing apparatuses  200 . Meanwhile, the printing system  1000  has a function of processing a job using only the sheet processing apparatus  200  without using the printing apparatus  100  (a post-processing function for an off-line job). 
       FIG. 6  is a view showing a display example of a setting screen for enabling the user to select the type of a sheet process to be performed on supplied sheets using only the sheet processing apparatus  200  without using the printing apparatus  100 . 
     This screen is displayed on the touch panel section  401  when the off-line process key  604  shown in  FIG. 6  on the screen displayed on the touch panel section  401  is pressed by the user. This display process is controlled by the control unit  205 . This screen is a setting screen configured so that the user can select the type of a sheet process that can be performed using the sheet processing apparatus  200  included in the printing system  1000 . Upon receiving from the user via this screen the settings of the sheet process to be performed for the processing target job, the control unit  205  causes the sheet processing apparatus  200  to perform the sheet process according to these settings. Here, a paper feed key  601  is a soft key for performing settings of a paper feed unit that feeds sheets to be processed and/or the number of sheets that are to be fed. In the off-line process, printed sheets are not transmitted from the printing apparatus  100 , and, thus, it is necessary to designate a paper feed unit that feeds sheets for the sheet process and the number of sheets. 
       FIG. 7  is a view showing an example of a user interface provided in the saddle stitching apparatus  200 - 3   c  according to this embodiment. In this user interface, the number of items that can be selected is smaller than the number of items in the user interface of the printing apparatus shown in  FIG. 6 . 
     In this diagram,  702 ,  703 , and  704  denote keys for respectively designating punching, cutting, and folding as the off-line sheet processing mode of the saddle stitching apparatus  200 - 3   c . Furthermore, each of  705  to  707  denotes an indicator for clearly indicating the off-line mode set in the saddle stitching apparatus  200 - 3   c , and this indicator is lit when the corresponding mode is set. A start key  708  is a key for instructing start of an off-line process of the saddle stitching apparatus  200 - 3   c  in the designated sheet processing mode. A stop key  709  is a key for stopping a currently performed off-line process. Here, in this embodiment, the operation unit provided on the saddle stitching apparatus  200 - 3   c  will be described as an example of the second user interface, but the same can be applied to the case in which an operation unit is provided on other sheet processing apparatuses  200 . 
       FIG. 8  is a block diagram showing the configuration of the saddle stitching apparatus  200 - 3   c  according to this embodiment. 
     An operation unit  801  constitutes part of the second user interface according to this embodiment. The operation unit  801  is provided on the saddle stitching apparatus  200 - 3   c , and is used for giving an instruction relating to an off-line sheet process. A control unit  802  comprehensively controls the saddle stitching apparatus  200 - 3   c . A ROM  803  stores programs to be executed by a CPU of the control unit  802 . A RAM  804  is used as a work area when the CPU of the control unit  802  executes a control process, and used for storing various types of data. An external I/F  805  is an interface for performing communication with external apparatuses such as the printing apparatus  100 . A mechanism drive unit  806  is a drive unit having a motor driver, a motor, and the like, and drives mechanism units of the saddle stitching apparatus  200 - 3   c  in response to instructions from the control unit  802 . A sensor unit  807  plays a role of transmitting sensor information according to the status of the saddle stitching apparatus  200 - 3   c  to the control unit  802 . 
       FIG. 9  is a flowchart illustrating an operation of a sheet process in the in-line job according to this embodiment. 
     This in-line job execution process is started when a copy key on the touch panel section  401  of the operation unit  204 , which is the first user interface, of the printing apparatus  100  is pressed to set a copy mode. First, in S 1 , if the sheet process setting key  609  on the touch panel section  401  of the operation unit  204  ( FIG. 4 ) is pressed, the procedure advances to S 2 . In S 2 , a screen for selecting a sheet process as shown in  FIG. 5  is displayed. Here, if the user selects a desired sheet process and presses an “OK” button, the procedure advances from S 3  to S 4 . In S 4 , if the start key  503  of the operation unit  204  is pressed, the procedure advances to S 5 . In S 5 , a document image is scanned by the scanner unit  201 , and image data obtained by that scanning is transmitted to the printer unit  203  to perform a printing process. Sheets that have been printed by the printer unit  203  in this manner are transmitted to the sheet processing apparatus  200  under the control of the control unit  205 , and the sheet process designated by the user in S 2  is performed (S 6 ). Then, in S 7 , it is determined whether or not the designated printing process and sheet process have been completed, and, if it is determined that the printing process has not been completed, the procedure returns to S 5 , and the above-described process is repeated. If it is determined in S 7  that the sheet process for the print job has been completed, this process ends. 
       FIG. 10  is a flowchart illustrating a process in the off-line job according to this embodiment. Here, an operation of a sheet process in the off-line job instructed by the operation unit  204 , which is the first user interface, of the printing apparatus  100  will be described. 
     Before starting this off-line job execution process, the user sets printed sheets on which the sheet process is to be performed, in the paper feed unit of the saddle stitching apparatus  200 - 3   c . First, in S 11 , the procedure waits for the off-line process key  604  displayed on the touch panel section  401  of the operation unit  204  is to be pressed. If the off-line process key  604  is pressed, the procedure advances to S 12  where the off-line process selecting screen shown in  FIG. 6  is displayed on the touch panel section  401 . The user operates this screen to select the type of a sheet process to be performed for the off-line job. Then, in S 13 , if the “paper feed” button  601  in  FIG. 6  is pressed, the procedure advances from S 13  to S 14 . In S 14 , a UI screen (not shown) is displayed. The user operates the UI screen to designate a paper feed unit. Moreover, in S 15 , the user can also operate the UI screen to designate the number of sheets that are to be fed. Here, if the user does not designate the number of sheets that are to be fed, it is desirable that the sheet process is performed until there is no more sheet in the paper feed unit designated in S 14 . If the settings of the sheet process in the off-line job have been completed in this manner, the user presses the “OK” button ( FIG. 6 ) to definitely determine the type of a process in the off-line job. 
     Next, the procedure advances to S 16 , and, if the start key  503  of the operation unit  204  is pressed, start of the sheet process in the off-line job is instructed. The control unit  205  recognizes this instruction, and controls the operation of the sheet processing apparatus  200 . In S 17 , the control unit  205  causes the paper feed unit designated in S 14  to feed sheets. Then, the procedure advances to S 18  where the off-line process designated in S 12  is performed. Next, in S 19 , it is determined whether or not the sheet process has been completed for the number of sheets that are to be fed designated in S 15 , and, if it is determined that the sheet process for the designated number of sheets has not been completed, the procedure returns to S 17 , and the above-described process is repeated. Then, if it is determined in S 19  that the sheet process for the designated number of sheets has been completed, the sheet process in the off-line job ends. 
     As described above, according to this embodiment, the sheet process together with the printing process (in-line job) and the sheet process in the off-line job can be set respectively using different UI screens of the first user interface. When the user presses the start button of the operation unit  204  of the printing apparatus  100 , the designated in-line job or off-line job is performed. 
     Furthermore, the sheet process in the off-line job can also be performed using the user interface (the second user interface ( FIG. 7 )) provided on the saddle stitching apparatus  200 - 3   c.    
       FIG. 11  is a flowchart illustrating a process using the saddle stitching apparatus  200 - 3   c  according to this embodiment. 
     Before performing this process, first, the user sets printed sheets in the paper feed unit. In this embodiment, constituent elements of the second user interface are limited to minimum necessary keys in order to reduce the cost, and, thus, there is no UI for designating a paper feed stage. Thus, the configuration is adopted in which the user sets printed sheets in an inserter provided on the saddle stitching apparatus  200 - 3   c , but the present invention is not limited to this. 
     First, in S 21 , the user operates the operation unit  801  ( FIG. 7 ), which is the second user interface, to select the type of a sheet process in the off-line job. Here, if the user desires a punching process, the punching key  702  is pressed. Accordingly, the indicator  705  is lit (S 22 ) to indicate that the punching function is selected for the sheet process. Next, the procedure advances to S 23  where it is determined whether or not the user has pressed the start key  708  of the operation unit  801 , and, if the start key  708  is pressed, a command to perform the sheet process in the off-line job is given. If this command is recognized by the control unit  802 , the procedure advances to S 24  where the control unit  802  transmits packets via the external I/F  805  to the control unit  205  of the printing apparatus  100 . The packets are transmitted in order to see whether or not the command of the operation unit  204 , which is the first user interface, is given priority. Next, the procedure advances to S 25  where it is determined whether or not a response has been received from the control unit  205  of the printing apparatus  100 . If a response has been received, it can be determined that the command of first user interface is given priority. In this case, the procedure advances to S 26  where the control unit  802  ignores the command to perform the sheet process input from the second user interface, and notifies the user that the off-line process cannot be performed. This notification is given, for example, by flashing the currently lit indicator  705  for a given length of time. 
     On the other hand, in S 25 , if no response has been received from the control unit  205  of the printing apparatus  100 , the procedure advances to S 27 , and it is determined that the command of the second user interface can be performed. This state corresponds to, for example, a state in which use of the printing apparatus  100  is restricted due to power constraint of the printing apparatus  100  or other troubles. That is to say, in this case, even when the second interface instructs a post-process different from that instructed by the first interface, the post-process instructed by the second interface can be performed without any conflict. In S 27 , the control unit  802  performs the paper feed process. The paper feed process is performed when the control unit  802  issues a drive command to the mechanism drive unit  806 , and the sensor unit  807  sequentially notifies information on the position of the sheets, the drive status of the motor, and the like. Next, the procedure advances to S 28  where the control unit  802  performs a sheet process according to the type of the sheet process selected in S 21 . Next, in S 29 , it is determined whether or not any sheets remain in the paper feed unit of the saddle stitching apparatus  200 - 3   c , and, if it is determined that a sheet remains, the procedure returns to S 27 , and the sheet process is repeated. On the other hand, if it is determined in S 29  that no sheet remains, the sheet process in the off-line job ends. 
     As described above, according to this embodiment, a sheet process in the off-line job can be instructed using either the first user interface or the second user interface. However, usually, the operation unit of the second user interface of the sheet processing apparatus is simple, and, thus, the user uses UIs in different manners according to the purposes. 
     Furthermore, in this embodiment, the operation of the first user interface is given priority such that instructions from the first user interface and the second user interface do not conflict each other. Thus, when the user wants to use the second user interface in view of the operation efficiency, a power saving key of the key input section  402  may be pressed to put the printing apparatus  100  in a power constrained state. However, it will be appreciated that other methods may be used to cause the control unit  205  and the control unit  802  to communicate with each other, thereby performing operation control for controlling the operations thereof so as to prevent conflict therebetween. 
     Accordingly, the effects as described below are obtained. 
     (1) When an operator wants to use detailed operations or user support functions, it is possible to instruct a post-process in the off-line job using the first user interface that is a richer user interface. On the other hand, when the operator wants to perform more efficient operations with the minimum movement distance, it is possible to instruct a post-process in the off-line job using the second user interface provided on the post-processing apparatus. 
     (2) Even when use of the printing apparatus is restricted due to power constraint or other troubles, it is possible to instruct a post-process in the off-line job using the second user interface, and to perform the post-process. 
     (3) When use of the printing apparatus is not restricted, even if different post-processes in the off-line job are instructed by the first user interface and the second user interface, it is possible to perform the post-process without any conflict. 
     OTHER EMBODIMENTS 
     Aspects of the present invention can also be realized by a computer of a system or apparatus (or devices such as a CPU or MPU) that reads out and executes a program recorded on a memory device to perform the functions of the above-described embodiment, and by a method, the steps of which are performed by a computer of a system or apparatus by, for example, reading out and executing a program recorded on a memory device to perform the functions of the above-described embodiment. For this purpose, the program is provided to the computer for example via a network or from a recording medium of various types serving as the memory device (e.g., computer-readable medium). 
     While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions. 
     This application claims the benefit of Japanese Patent Application No. 2009-278942, filed Dec. 8, 2009, which is hereby incorporated by reference herein in its entirety.