Patent Publication Number: US-9405253-B2

Title: Image forming system and computer-readable recording medium

Description:
This application is based on Japanese Patent Application No. 2010-280097 filed on Dec. 16, 2010, the contents of which are hereby incorporated by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an image forming system and a technique relevant to the same. 
     2. Description of the Background Art 
     Some of image forming apparatuses are each equipped with a display part (operation panel or the like) and display various screens thereon. In a display part (such as a liquid crystal display part or the like) of an image forming apparatus disclosed in Japanese Patent Application Laid Open Gazette No. 2009-37017, for example, provided are two exclusive partial areas, i.e., one partial area relating to a setting screen for mode setting and the other partial area relating to a job list screen or the like. 
     In the image forming apparatus disclosed in Japanese Patent Application Laid Open Gazette No. 2009-37017, however, the setting screen for mode setting can be displayed only in the one partial area and the job list screen or the like can be displayed only in the other partial area. In other words, the display of the setting screen for mode setting is performed restrictively in the one partial area of the display part and the display of the job list screen or the like is performed restrictively in the other partial area of the display part. Thus, in the technique disclosed in Japanese Patent Application Laid Open Gazette No. 2009-37017, the display part cannot be used efficiently. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to provide an image forming system capable of using a display part efficiently and a technique relevant to the same. 
     The present invention is intended for an image forming system. According to the present invention, the image forming system comprises an input control part for receiving an operation input from a user, and a display control part for selectively displaying a setting screen for mode setting and a job list screen displaying a list of jobs, on a display part in response to the operation input, and in the image forming system of the present invention, the display control part displays the job list screen on the display part when a first instruction which is a display instruction for the job list screen is received during a setting operation period for mode setting, and the display control part hides the job list screen and displays an information display screen relating to an operation which is performed during the setting operation period, on the display part, when a second instruction which is a non-display instruction for the job list screen is received while the job list screen is being displayed. 
     The present invention is also intended for a non-transitory computer-readable recording medium. According to the present invention, the non-transitory computer-readable recording medium records therein a computer program for causing a computer to serve as a device comprising an input control part for receiving an operation input from a user, and a display control part for selectively displaying a setting screen for mode setting in an image forming system and a job list screen displaying a list of jobs of the image forming system, on a display part in response to the operation input, and in the image forming system, the display control part displays the job list screen on the display part when a display instruction for the job list screen is received during a setting operation period for mode setting, and the display control part hides the job list screen and displays an information display screen relating to operation items in a setting operation on the display part when a non-display instruction for the job list screen is received while the job list screen is being displayed. 
     These and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a view showing a schematic configuration of an image forming apparatus in accordance with a first preferred embodiment; 
         FIG. 2  is a functional block diagram showing a schematic constitution of the image forming apparatus; 
         FIG. 3  is a view showing an appearance of an operation panel part; 
         FIG. 4  is a view showing operation history information data; 
         FIGS. 5 and 6  are flowcharts showing an operation of the image forming apparatus; 
         FIG. 7  is a view showing an initial screen; 
         FIGS. 8 to 11  are views each showing a setting screen; 
         FIG. 12  is a view showing a job list screen; 
         FIG. 13  is a flowchart showing an operation of the image forming apparatus in accordance with a second preferred embodiment; 
         FIG. 14  is a view showing a list screen; 
         FIG. 15  is a flowchart showing an operation of the image forming apparatus in accordance with a variation; 
         FIG. 16  is a view showing operation history information data in accordance with the variation; 
         FIG. 17  is a view showing a schematic constitution of an image forming system in accordance with another variation. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Hereinafter, the preferred embodiments of the present invention will be discussed with reference to the accompanying drawings. 
     1. The First Preferred Embodiment 
     1-1. Constitution 
       FIG. 1  is a schematic view showing an appearance of an image forming apparatus  1  in accordance with the present invention. Herein, the image forming apparatus  1  is configured as a Multi Function Peripheral (abbreviated as “MFP”). The MFP is an apparatus (also referred to as a “multifunction machine”) comprising a scanner function, a printer function, a copy function, a facsimile communication function and the like. 
       FIG. 2  is a functional block diagram showing a schematic constitution of the image forming apparatus  1 . 
     As shown in  FIG. 2 , the image forming apparatus  1  comprises an image reading part  2 , a printing part  3 , a communication part  4 , a storage part  5 , an input/output part  6 , a controller  9 , and the like and multiply uses these constituent parts to implement various functions. 
     The image reading part  2  is a processing part which optically reads an original manuscript placed on a predetermined position of the image forming apparatus  1  and generates image data of the original manuscript (referred to also as an “original manuscript image”). 
     The printing part  3  is an output part which prints out an image to various media such as paper on the basis of the image data on an object image. 
     The communication part  4  is a processing part capable of performing facsimile communication via public networks or the like. Further, the communication part  4  is capable of performing network communication via a network NW. The network communication uses various protocols such as TCP/IP (Transmission Control Protocol/Internet Protocol), FTP (File Transfer Protocol), and the like, and by using the network communication, the image forming apparatus  1  can transmit and receive various data to/from desired partners. 
     The storage part  5  is a storage device such as a hard disk drive (HDD), a nonvolatile memory, or/and the like. In the storage part  5 , stored is operation history information data TB 1  shown in  FIG. 4 . In the operation history information data TB 1 , recorded is history information (operation history information) relating to an operation (or operations) which is (are) performed during a setting operation period. 
     Specifically, as shown in  FIG. 4 , in the operation history information data TB 1 , recorded are pieces of information of “Set Item”, “Display”, “Change of Settings”, and “Setting Details”. A set item (item name) to be operated is recorded in the “Set Item”, and whether a setting screen SG corresponding to the set item to be operated has been displayed or not (Yes/No) is recorded in the “Display”. Further, whether the set item to be operated has been changed or not (Yes/No) is recorded in the “Change of Settings”, and a detail of the set item to be operated is recorded in the “Setting Details”. The information recorded in the “Display” is also referred to as “display history information” and the information recorded in the “Change of Settings” is also referred to as “setting change history information”. 
     The input/output part  6  comprises an operation input part  6   a  for receiving an input which is given to the image forming apparatus  1  and a display part  6   b  for displaying various information thereon. In more detail, the image forming apparatus  1  is provided with an operation panel part  60  (see  FIGS. 1 and 3 ) which serves as the input/output part  6 . As shown in  FIG. 3 , the operation panel part  60  is provided with hard keys KY (KY 1 , KY 2 , and the like) and a touch screen  63 . 
     The hard keys KY serve as part of the operation input part  6   a . Specifically, the hard keys KY include a start key KY 1 , a reset key KY 2 , other keys (a ten key and the like), and the like. 
     The touch screen  63  is a liquid crystal display panel in which a piezoelectric sensor or the like is embedded, serving as part of the display part  6   b  and also serving as part of the operation input part  6   a . In more detail, the touch screen  63  is capable of displaying various information on the liquid crystal display panel and detecting a manipulation position of a finger of a user (an operator or the like) on the liquid crystal display panel to receive various inputs. When the finger of the user touches a virtual button displayed on the touch screen  63 , for example, such a manipulation is regarded as a pressing operation on the virtual button. 
     Thus, the input/output part  6  is capable of displaying appropriate information to the user and receiving an input operation of the user. 
     The controller  9  is a control part for generally controlling the image forming apparatus  1  and comprises a CPU and various semiconductor memories (RAM, ROM, and the like). It can be also said that the controller  9  is a computer which is embedded in the image forming apparatus  1 . Various processing parts operate under the control of the controller  9  to implement various functions of the image forming apparatus  1 . The controller  9  causes the CPU to execute a predetermined software program (hereinafter, referred to simply as a “program”) PG (referred to also as “PG 1 ”) stored in the ROM (e.g., EEPROM or the like), to thereby implement various processing parts. Further, the program PG 1  may be acquired via various portable (in other words, non-transitory) computer-readable recording media (a USB memory or the like). Alternatively, the program PG may be downloaded via the network or the like and installed into the image forming apparatus  1 . 
     Specifically, the controller  9  implements various processing parts including an input control part  11 , a display control part  12 , a history recording part  13 , and the like. The input control part  11  is a processing part for receiving an operation input from the user. The display control part  12  is a processing part for controlling a display on the touch screen  63  or the like in the operation panel part  60 . The history recording part  13  is a processing part for recording history information relating to the operation(s) performed during the setting operation period as the operation history information data TB 1 . 
     1-2. Operation 
     As discussed above, in an image forming apparatus provided with two exclusive partial areas in the display part, a setting screen for mode setting can be displayed only in the one partial area among the two partial areas and a job list screen or the like can be displayed only in the other partial area among the two partial areas. 
     In contrast to this, in the image forming apparatus  1  of the first preferred embodiment, as discussed later, a setting screen SG for mode setting (see  FIGS. 8 to 11 ) and a job list screen JG displaying a list of jobs (see  FIG. 12 ) are selectively displayed on the touch screen  63  in response to the operation input form the user. For this reason, it is possible to avoid a situation where the setting screen SG can be displayed only in the one partial area of the touch screen  63  and also possible to avoid another situation where the job list screen JG can be displayed only in the other partial area of the touch screen  63 . Therefore, it is possible to efficiently use the touch screen  63  (accordingly, the display part  6   b ). 
     As a technique for selectively displaying the setting screen SG and the job list screen JG, suggested is, for example, a technique in which only after the setting screen SG is closed by pressing an “OK” button or a “Cancel” button while the setting screen SG is being displayed, the other screen (the job list screen JG) can be displayed. In other words, suggested is a technique in which after the setting screen SG is hid by giving a non-display instruction for the setting screen SG which is being displayed, a display instruction for the job list screen JG is given, to thereby display the job list screen JG. 
     Herein, as to such a technique, a situation will be considered where while a user UA is performing a setting operation for mode setting, a user UB intends to watch the job list screen JG. In this situation, the “OK” button or the “Cancel” button is pressed while the setting screen SG is being displayed, to thereby once hide the setting screen SG, and then the job list screen JG is displayed on the touch screen  63  in response to the display instruction for the job list screen JG. Thus, the setting operation performed by the user UA is interrupted, and the user UB can watch the job list screen JG. After the user UB finishes to watch the job list screen JG, the user UA can call up again the setting screen relating to an item to be set, by his own operation, to thereby resume the setting operation. 
     When the user UA displays the setting screen SG again after the user UB finishes to watch the job list screen JG, however, the user UA who is obliged to suspend the setting operation for mode setting sometimes forgets the detail of the setting operation before the interruption and therefore, it may become hard to resume the setting operation (though it depends on the length of the period while the user UB watches the job list screen JG). 
     Then, in the first preferred embodiment, as discussed later, the image forming apparatus  1  hides the job list screen JG in response to a non-display instruction RC 2  for the job list screen JG (see  FIG. 12 ) and displays the setting screen SG ( FIGS. 8 to 11  and the like) used during a setting operation period TM for mode setting, on the touch screen  63 . In more detail, the image forming apparatus  1  displays the last setting screen (in detail, referred to also as the “last display screen) SG which is displayed last during the setting operation period, on the touch screen  63 . Accordingly, even when the job list screen JG is displayed in response to a display instruction RC 1  for the job list screen JG and the setting operation for mode setting is interrupted, the last setting screen SG in setting operation period TM is displayed after that in response to the non-display instruction RC 2  for the job list screen JG. Therefore, by watching the last setting screen SG, the user can easily recognize the setting operation which is performed last during the setting operation period TM. 
     Hereinafter, with reference to  FIGS. 5 to 12 , detailed discussion will be made on an operation of the image forming apparatus  1 . 
       FIGS. 5 and 6  are flowcharts showing an operation of the image forming apparatus  1  in accordance with the first preferred embodiment.  FIGS. 7 to 12  are views showing screens GA 1  to GA 6 , respectively, displayed on the touch screen  63 . 
     In more detail,  FIG. 7  is a view showing an initial screen (referred to also as a “default screen”) GA 1  displayed on the touch screen  63  immediately after the turn-on, the pressing of the reset key KY 2  (see  FIG. 3 ), or the like.  FIG. 8  is a view showing a screen GA 2  having a setting screen SG 12  for setting of a “Color” mode.  FIG. 9  is a view showing a screen GA 3  having a setting screen SG 14  for setting of a “Paper” mode.  FIG. 10  is a view showing a screen GA 4  having a setting screen SG 16  for setting of a “Duplex/Combine” mode.  FIG. 11  is a view showing a screen GA 5  having a setting screen SG 17  for setting of a “Finishing” mode.  FIG. 12  is a view showing a screen GA 6  having the job list screen JG. 
     In the default screen GA 1  of  FIG. 7 , displayed are (virtual) buttons BN 11  to BN 17  corresponding to respective set items, “Original Type”, “Color”, “Density”, “Paper”, “Zoom”, “Duplex/Combine”, and “Finishing”. 
     When any one of the buttons BN 11  to BN 17  is pressed, the display control part  12  pops up the setting screen SG for the set item corresponding to the pressed button, on the touch screen  63 . By using the setting screens SG (see  FIGS. 8 to 11 ), the user can set various modes. 
     Further, in each of the screens GA 1  to GA 2  ( FIGS. 7 to 12 ), a “Job List” button BN 21  is also displayed. When the “Job List” button BN 21  is pressed and the display instruction RC 1  for the job list screen JG (an instruction for displaying the job list screen JG) is received, the display control part  12  pops up the job list screen JG shown in  FIG. 12  on the touch screen  63 . 
     In the job list screen JG of  FIG. 12 , displayed is a list of jobs including a running job (a printing job or the like), a waiting job (a print wait job or the like), and the like. 
     Further, in the job list screen JG, displayed is a “Close” button (a button having the character “Close” surrounded by a heavy circle in  FIG. 12 ) for receiving the non-display instruction RC 2  for the job list screen JG (an instruction for hiding the job list screen JG). When the “Close” button is pressed while the job list screen JG is being displayed, the display control part  12  determined that the non-display instruction RC 2  for the job list screen JG is received and hides the job list screen JG. Also when the reset key KY 2  (see  FIG. 3 ) or the “Job List” button BN 21  is pressed while the job list screen JG is being displayed, the display control part  12  determined that the non-display instruction RC 2  for the job list screen JG is received and hides the job list screen JG. 
     Further, while the job list screen JG is being displayed, the buttons (buttons BN 11  to BN 17  and the like) displayed outside the job list screen JG are disabled as a general rule for the purpose of preventing any wrong operation. The “Job List” button BN 21  is valid exceptionally, however, even when the job list screen JG is being displayed, for the purpose of receiving the non-display instruction RC 2  for the job list screen JG as discussed above. 
     Hereinafter, discussion will be a case where setting operations relating to four kinds of set items ((1) “Color”, (2) “Paper”, (3) “Duplex/Combine”, and (4) “Finishing”) are sequentially performed during the setting operation period TM from a time T 10  to a time T 20 , and then (5) an operation for displaying the job list screen JG and (6) an operation for hiding the job list screen JG are subsequently performed. 
     (1) First, a setting operation relating to the set item “Color” is performed. Specifically, after the setting screen SG 12  corresponding to the set item “Color” is displayed, a default “Auto Color” mode is changed to a “Full Color” mode. 
     In more detail, at the time T 10 , first, when a button BN 12  in the screen GA 1  ( FIG. 7 ) is pressed, it is determined in Step S 11  in  FIG. 5  that the setting operation relating to the set item “Color” is performed (started, in more detail), and the process goes to Step S 12 . 
     In Step S 12 , the display control part  12  pops up the setting screen SG 12  of  FIG. 8  on the touch screen  63 . The history recording part  13  updates the operation history information data TB 1 . Specifically, the history recording part  13  records “Color” into the first “Set Item” in the operation history information data TB 1  and records “Yes” into the “Display” as shown in  FIG. 4 . In other words, it is recorded that the setting screen SG 12  relating to the set item “Color” is displayed. At this point in time, since any setting operation for mode setting of the set item “Color” is not performed yet, the history recording part  13  records “No” into the first “Change of Settings” in the operation history information data TB 1  and records default “Auto Color” into the “Setting Details”. 
     After the operation history information data TB 1  is updated, it is determined in Step S 13  whether or not the start key KY 1  or the “Job List” button BN 21  is pressed. When it is determined that the start key KY 1  or the “Job List” button BN 21  is pressed, the process goes to Step S 14 , and otherwise the process returns to Step S 11 . At this point in time, since neither the start key KY 1  nor the “Job List” button BN 21  is pressed, the process returns to Step S 11 . 
     The process steps S 11  to S 13  are repeatedly performed until it is determined that the start key KY 1  or the “Job List” button BN 21  is pressed. This execution state is also referred to as a state (referred to also as a “standby state WS 1 ”) for waiting for a pressing operation of any operation member. In the standby state WS 1 , not only the start key KY 1  or the “Job List” button BN 21  but also a setting operation relating to the set item can be received. 
     In the standby state WS 1 , a “Full Color” button (a button having the character “Full Color” surrounded by a rectangle in  FIG. 8 ) in the setting screen SG 12  ( FIG. 8 ) is pressed and the “OK” button (a button having the character “OK” surrounded by a heavy circle in this figure) is further pressed. Then, in response to the pressing operation, it is determined again that the setting operation relating to the set item “Color” is performed, and the process goes from Step S 11  to Step S 12 . 
     In Step S 12 , the image forming apparatus  1  changes the mode for the set item “Color” from the default “Auto Color” to the “Full Color”. 
     The history recording part  13  records “Yes” into the first “Change of Settings” in the operation history information data TB 1  and records “Full Color” into the first “Setting Details” as shown in  FIG. 4 . In other words, it is recorded that the setting for the set item “Color” is changed, and further, the detail of the setting is recorded. 
     Further, the display control part  12  hides the setting screen SG 12 . 
     Then, the process returns through Step S 13  to Step S 11 , and the image forming apparatus  1  goes into the standby state WS 1  again. 
     When the “Cancel” button (a button having the character “Cancel” surrounded by a heavy circle in this figure) in the setting screen SG 12  of  FIG. 8 , instead of the “OK” button, is pressed, the image forming apparatus  1  does not change the mode for the set item “Color” and the hides the setting screen SG 12 . For example, when the “Full Color” button in the setting screen SG 12  is pressed and then the “Cancel” button is pressed, the image forming apparatus  1  does not change the mode for the set item “Color” from the “Auto Color” to the “Full Color” and hides the setting screen SG 12 . 
     (2) Subsequently, a setting operation relating to the set item “Paper” is performed. Specifically, after the setting screen SG 14  corresponding to the set item “Paper” is displayed, a default “Auto” mode is not changed and the setting screen SG 14  is hid. 
     In more detail, first, when a button BN 14  in the screen GA 1  is pressed, it is determined in Step S 11  in  FIG. 5  that the setting operation relating to the set item “Paper” is performed, and the process goes to Step S 12 . 
     In Step S 12 , the display control part  12  pops up the setting screen SG 14  of  FIG. 9  on the touch screen  63 . The history recording part  13  records “Paper” into the second “Set Item” in the operation history information data TB 1  and records “Yes” into the “Display” as shown in  FIG. 4 . In other words, it is recorded that the setting screen SG 14  relating to the set item “Paper” is displayed. At this point in time, since any setting operation for mode setting of the set item “Paper” is not performed yet, the history recording part  13  records “No” into the second “Change of Settings” in the operation history information data TB 1  and records default “Auto” into the “Setting Details”. 
     Then, the process returns through Step S 13  to Step S 11 , and the image forming apparatus  1  goes into the standby state WS 1  again. 
     After that, in the standby state WS 1 , without performing any setting change operation for mode setting, the “OK” button or the “Cancel” button in the setting screen SG 14  ( FIG. 9 ) is pressed. In response to the pressing of this button, the display control part  12  hides the setting screen SG 14 . 
     (3) Subsequently, a setting operation relating to the set item “Duplex/Combine” is performed. Specifically, after the setting screen SG 16  corresponding to the set item “Duplex/Combine” is displayed, a default “1-Sided&gt;1-Sided/Off” mode is changed to a “1-Sided&gt;1-Sided/2 in 1” mode. 
     In more detail, first, when a button BN 16  in the screen GA 1  is pressed, it is determined in Step S 11  in  FIG. 5  that the setting operation relating to the set item “Duplex/Combine” is performed, and the process goes to Step S 12 . 
     In Step S 12 , the display control part  12  pops up the setting screen SG 16  of  FIG. 10  on the touch screen  63 . The history recording part  13  records “Duplex/Combine” into the third “Set Item” in the operation history information data TB 1  and records “Yes” into the “Display” as shown in  FIG. 4 . In other words, it is recorded that the setting screen SG 16  relating to the set item “Duplex/Combine” is displayed. At this point in time, since any setting operation for mode setting of the set item “Duplex/Combine” is not performed yet, the history recording part  13  records “No” into the third “Change of Settings” in the operation history information data TB 1  and records default “1-Sided&gt;1-Sided/Off” into the “Setting Details”. 
     Then, the process returns through Step S 13  to Step S 11 , and the image forming apparatus  1  goes into the standby state WS 1  again. 
     After that, in the standby state WS 1 , a “2 in 1” button in the setting screen SG 16  ( FIG. 10 ) is pressed and the “OK” button is further pressed. Then, in response to the pressing operation, it is determined in Step S 11  that the setting operation relating to the set item “Duplex/Combine” is performed, and the process goes to Step S 12 . 
     In Step S 12 , the image forming apparatus  1  changes the mode for the set item “Duplex/Combine” from the default “1-Sided&gt;1-Sided/Off” to the “1-Sided&gt;1-Sided/2 in 1”. The history recording part  13  records “Yes” into the third “Change of Settings” in the operation history information data TB 1  and records “1-Sided&gt;1-Sided/2 in 1” into the “Setting Details” as shown in  FIG. 4 . Further, the display control part  12  hides the setting screen SG 16 . 
     The image forming apparatus  1  goes into the standby state WS 1  again. 
     Finally, a setting operation relating to the set item “Finishing” is performed. Specifically, after the setting screen SG 17  corresponding to the set item “Finishing” is displayed. As discussed later, while the setting screen SG 17  is being displayed (in other words, at some midpoint in the last setting operation), the display instruction RC 1  for the job list screen JG is received. 
     In more detail, first, when a button BN 17  in the screen GA 1  is pressed, it is determined that the setting operation relating to the set item “Finishing” is performed, and the process goes from Step S 11  to Step S 12 . 
     In Step S 12 , the display control part  12  pops up the setting screen SG 17  of FIG.  11  on the touch screen  63 . The history recording part  13  records “Finishing” into the fourth “Set Item” in the operation history information data TB 1  and records “Yes” into the “Display” as shown in  FIG. 4 . In other words, it is recorded that the setting screen SG 17  relating to the set item “Finishing” is displayed. At this point in time, since any setting operation for mode setting of the set item “Finishing” is not performed yet, the history recording part  13  records “No” into the fourth “Change of Settings” in the operation history information data TB 1  and records default “Staple Off” into the “Setting Details”. 
     Then, the image forming apparatus  1  goes into the standby state WS 1  again. 
     Thus, while the setting operations relating to the set items (“Color”, “Paper”, “Duplex/Combine”, “Finishing” and the like) are performed, the history information on the operations performed during the setting operation period TM is recorded as the operation history information data TB 1 . 
     (5) Subsequently, the display instruction RC 1  for the job list screen JG is received at the time T 20  while the setting screen SG 17  is being displayed, and then in response to the display instruction RC 1 , the operation for displaying the job list screen JG is performed. 
     In more detail, the “Job List” button BN 21  is pressed and the display instruction RC 1  for the job list screen JG is received while the setting screen SG 17  of  FIG. 11  is being displayed. When the display instruction RC 1  is received, the process goes through Steps S 13  and  14  to Step S 15 . 
     In Step S 15 , it is determined whether or not the setting screen SG 17  which is displayed last during the setting operation period TM (from the time T 10  to the time T 20 ) is being displayed on the touch screen  63 . When the setting screen SG 17  which is displayed last is being displayed, the process goes to Step S 16 , and otherwise the process goes to Step S 17 . In this case, since the “Job List” button BN 21  is pressed while the setting screen SG 17  is being displayed, the process goes to Step S 16 . 
     In Step S 16 , the display control part  12  hides the setting screen SG 17  which is displayed last during the setting operation period TM. After the setting screen SG 17  is hid, the display control part  12  displays the job list screen JG on the touch screen  63  as shown in  FIG. 12  in Step S 17 . 
     Then, the process goes from Step S 17  to Step S 18 . In Step S 18 , it is determined whether or not the non-display instruction RC 2  for the job list screen JG is received. The operation of Step S 18  continues until the non-display instruction RC 2  for the job list screen JG is received. It can be also said that the state where the operation of Step S 18  is performed is a state (referred to also as a “standby state WS 2 ”) for waiting for the non-display instruction RC 2 . 
     (6) After that, while the job list screen JG is being displayed (in other words, in the standby state WS 2  (for the non-display instruction RC 2 )), the non-display instruction RC 2  for the job list screen JG is received and an operation of hiding the job list screen JG, and the like, are performed in response to the non-display instruction RC 2 . 
     In more detail, when the “Close” button, for example, is pressed and the non-display instruction RC 2  for the job list screen JG is received while the job list screen JG is being displayed, the process goes from Step S 18  to Step S 19 . 
     In Step S 19 , in response to the non-display instruction RC 2 , the display control part  12  hides the job list screen JG and displays a display screen (hereinafter, referred to as an “information display screen IG”) relating to the operation performed during the setting operation period TM on the basis of the operation history information data TB 1  (see  FIG. 4 ). 
     More specifically, first, the display control part  12  determines the setting screen SG which is displayed last during the setting operation period TM as the information display screen IG on the basis of the information of the “Display” (display history information) recorded in the operation history information data TB 1 . In this case, as shown in  FIG. 4 , since the set item “Finishing” is recorded last (fourth) and “Yes” is recorded in the “Display” (display history information), the display control part  12  determines the setting screen SG 17  corresponding to the set item “Finishing” as the information display screen IG. Then, the display control part  12  hides the job list screen JG and displays the setting screen SG 17  which is displayed last during the setting operation period TM, on the touch screen  63 . 
     After the operation of Step S 19  is completed, the process goes to Step S 11  again, and the image forming apparatus  1  goes into the standby state WS 1 . 
     After that, when the start key KY 1  is pressed in the standby state WS 1 , the process goes from Step S 14  to Step S 20 . In Step S 20 , the image forming apparatus  1  performs a target job (e.g., a target copy job). Further, the image forming apparatus  1  deletes (initializes) the pieces of information recorded in the operation history information data TB 1 . 
     Further, the pieces of information recorded in the operation history information data TB 1  are initialized also when the reset key KY 2  (see  FIG. 3 ) is pressed, as a general rule. The pressing of the reset key KY 2  performed while the job list screen JG is being displayed is, however, received as the non-display instruction RC 2  for the job list screen JG as discussed above. For this reason, when the reset key KY 2  is pressed while the job list screen JG is being displayed, the pieces of information recorded in the operation history information data TB 1  are not initialized exceptionally. In other words, depending on whether or not the job list screen JG is being displayed on the touch screen  63 , an operation to be performed when the reset key KY 2  is pressed varies.  FIG. 6  is a flowchart showing the above-discussed operation to be performed when the reset key KY 2  is pressed. 
     When it is determined that the reset key KY 2  is pressed, the operation shown in  FIG. 6  is performed. First, in Step S 32  of  FIG. 6 , it is determined whether or not the job list screen JG is being displayed on the touch screen  63 . When the job list screen JG is being displayed, the process goes to Step S 33 . In Step S 33 , the pressing of the reset key KY 2  (performed while the job list screen JG is being displayed) is received as the non-display instruction RC 2  for the job list screen JG, and the display control part  12  hides the job list screen JG. On the other hand, when the job list screen JG is not being displayed, the process goes to Step S 34 . In Step S 34 , the history recording part  13  initializes the pieces of information recorded in the operation history information data TB 1 . 
     Thus, in the operation of the first preferred embodiment, the setting screens SG (see  FIGS. 8 to 11 ) and the job list screen JG (see  FIG. 12 ) are selectively displayed on the touch screen  63  in response to the operation input from the user. For this reason, it is possible to avoid a situation where the setting screen SG can be displayed only in a restrictive partial area of the touch screen  63  and also possible to avoid another situation where the job list screen JG can be displayed only in the other partial area of the touch screen  63 . Therefore, it is possible to efficiently use the touch screen  63  (accordingly, the display part  6   b ). 
     Further, when the display instruction RC 1  for the job list screen JG (see  FIG. 12 ) is received while the setting screen SG 17  (see  FIG. 11 ), for example, is being displayed, the display control part  12  hides the setting screen SG 17  which has been displayed until then and displays the job list screen JG on the touch screen  63  in place of the setting screen SG 17 . 
     After that, when the non-display instruction RC 2  for the job list screen JG is received while the job list screen JG is being displayed, the display control part  12  hides the job list screen JG and displays the setting screen SG 17  as the information display screen IG. In more detail, in response to the non-display instruction RC 2 , the job list screen JG (see  FIG. 12 ) is hid and the setting screen SG 17  (see  FIG. 11 ) which is displayed last during the setting operation period TM is displayed as the information display screen IG on the touch screen  63 . 
     Accordingly, even when the job list screen JG is displayed in response to the display instruction RC 1  (Step S 17  in  FIG. 5 ) and the setting operation for mode setting is interrupted, the setting screen SG 17  is displayed as the information display screen IG after that in response to the non-display instruction RC 2  (Steps S 18  and S 19 ). Therefore, by watching the setting screen SG 17  after the non-display instruction RC 2 , the user can easily recognize the setting operation which is performed last during the setting operation period TM. Especially, since the setting screen SG 17  is displayed on the touch screen  63  without requiring any labor (the pressing of the button BN 17  or the like) of the user, the labor of the user can be reduced. Further, it is possible for the user to easily resume the mode setting operation relating to the set item “Finishing” by using the corresponding setting screen SG 17 . 
     Though the display instruction RC 1  for the job list screen JG is received while the setting screen SG (in detail, SG 17 ) is being displayed in the above-discussed case, this is only one exemplary case. The display instruction RC 1  for the job list screen JG may be received after the setting screen SG is hid. 
     There may be a case, for example, where the display instruction RC 1  for the job list screen JG is received after the setting screen SG 16  is hid and before the setting screen SG 17  is displayed. In this case, when the non-display instruction RC 2  for the job list screen JG is received after that, the display control part  12  has only to hide the job list screen JG and display the setting screen SG 16  displayed last during the setting operation period TM on the touch screen  63  in Step S 19 . 
     2. The Second Preferred Embodiment 
     The second preferred embodiment is a variation of the first preferred embodiment. 
     In the second preferred embodiment, as the above-discussed information display screen IG (a screen relating to the operation performed during the setting operation period TM), a list screen of operation history on a setting operation (or setting operations) is displayed. 
     Hereinafter, with reference to the flowchart of  FIG. 13 , discussion will be made on the second preferred embodiment, centering on the difference from the first preferred embodiment. 
     In the second preferred embodiment, the operation of Step S 59  in  FIG. 13  is different from the operation of corresponding Step S 19  (see  FIG. 5 ) in the first preferred embodiment. In Steps S 51  to S 58  and S 60  of  FIG. 13 , the same operations are performed as those in Steps S 11  to S 18  and S 20  of  FIG. 5 , respectively. 
     Specifically, in Step S 59 , in response to the non-display instruction RC 2 , the display control part  12  hides the job list screen JG and pops up a list screen LG of operation history on a setting operation (or setting operations) (see  FIG. 14 ) on the touch screen  63  on the basis of the operation history information data TB 1 . 
     In the list screen LG, one or a plurality of setting details which are operated during the setting operation period TM are displayed. Specifically, as shown in  FIG. 14 , in the list screen LG, a set item and the detail of the set item are displayed in each of boxes BX 1  to BX 4 . The set item “Color” and the detail “Full Color” are displayed in the box BX 1 , and the set item “Paper” and the detail “Auto” are displayed in the box BX 2 . The set item “Duplex/Combine” and the detail “1-Sided&gt;1-Sided/2 in 1” are displayed in the box BX 3 , and the set item “Finishing” and the detail “Staple Off” are displayed in the box BX 4 . These boxes BX 1  to BX 4  also serve as “(virtual) buttons” which can be selectively operated (pressed) by the user. 
     When one of these boxes BX 1  to BX 4  is selected and pressed by the user, in response to the pressing operation, the display control part  12  hides the list screen LG and displays a specific setting screen SG corresponding to the specific set item which is selected by the user on the touch screen  63 . When the box BX 1  is selected, for example, the display control part  12  displays the setting screen SG 12  (see  FIG. 8 ) corresponding to the set item “Color” on the touch screen  63 . 
     In the above-discussed operation, in response to the non-display instruction RC 2 , the job list screen JG is hid and the list screen LG on a plurality of set items which are operated during the setting operation period TM is displayed on the touch screen  63 . Therefore, even when the job list screen JG is displayed and the setting operation for mode setting is interrupted, the user can easily recognize the operation(s) before the interruption of the setting operation, in the list screen LG. Further, by watching the list screen LG after the non-display instruction RC 2 , the user can look down at the operations to grasp the whole thereof. 
     Further, when one of these boxes BX 1  to BX 4  in the list screen LG is selected by the user, a specific setting screen SG corresponding to the specific set item which is selected by the user is displayed. With this operation, the user can easily call up the specific setting screen SG (SG 12  or the like) relating to the operation performed during the setting operation period TM and easily resume the setting operation by using the specific setting screen SG. 
     3. Variations 
     Though the preferred embodiments of the present invention have been discussed above, the present invention is not limited to the above-discussed preferred embodiments, but allows various variations. 
     For example, though the setting screen SG 17  (see  FIG. 11 ) which is displayed last during the setting operation period TM is displayed as the information display screen IG (see Step S 19  in  FIG. 5 ) in the first preferred embodiment, this is only one exemplary case. 
     Specifically, the setting screen SG 12  (see  FIG. 8 ) which is displayed first during the setting operation period TM may be displayed as the information display screen IG in Step S 19  of  FIG. 5 . In more detail, first, the display control part  12  determines the setting screen SG which is displayed first during the setting operation period TM as the information display screen IG on the basis of the information of the “Display” (display history information) recorded in the operation history information data TB 1 . When the set item “Color” is first recorded and “Yes” is recorded in the “Display” (display history information) as shown in  FIG. 4 , the display control part  12  determines the setting screen SG 12  corresponding to the set item “Color” as the information display screen IG. Then, the display control part  12  hides the job list screen JG and displays the setting screen SG 12  which is displayed first during the setting operation period TM as the information display screen IG on the touch screen  63 . 
     With such an operation, in response to the non-display instruction RC 2 , the job list screen JG is hid and the setting screen SG 12  which is displayed first during the setting operation period TM is displayed as the information display screen IG on the touch screen  63 . Especially, even when the job list screen JG is displayed in response to the display instruction RC 1  and the setting operation for mode setting is interrupted, the setting screen SG 12  is displayed after that in response to the non-display instruction RC 2 . Therefore, by watching the setting screen SG 12  after the non-display instruction RC 2 , the user can easily recognize the setting operation which is performed first during the setting operation period TM. Especially, since the setting screen SG 12  is displayed on the touch screen  63  without requiring any labor (the pressing of the button BN 12  or the like) of the user, the labor of the user can be reduced. Further, especially for the user who wants to perform the setting operations for mode setting in accordance with a predetermined procedure, this operation is very useful since the screen for the setting operation to be operated first during the setting operation period TM is automatically displayed. 
     Alternatively, in Step S 19  of  FIG. 5  or the like, two or more setting screens SG which are displayed during the setting operation period TM may be displayed in the order of operation during the setting operation period TM. 
     For example, all the setting screens (specifically, four setting screens) from the setting screen SG 12  which is displayed first during the setting operation period TM to the setting screen SG 17  which is displayed last, i.e., SG 12  (see  FIG. 8 ), SG 14  (see  FIG. 9 ), SG 16  (see  FIG. 10 ), and SG 17  (see  FIG. 11 ), may be displayed on the touch screen  63  in the order of display during the setting operation period TM. 
     In more detail, first, the display control part  12  determines the order of display of the setting screens SG during the setting operation period TM with reference to the operation history information data TB 1 . As shown in  FIG. 4 , the pieces of information are recorded in the operation history information data TB 1  in the order of set items “Color”, “Paper”, “Duplex/Combine”, and “Finishing”, and “Yes” is recorded in each “Display” (display history information). The display control part  12  determines the order of the “setting screens SG 12 , SG 14 , SG 16 , and SG 17 ” as the order of display during the setting operation period TM on the basis of the operation history information data TB 1 . Then, the display control part  12  sequentially displays the setting screens SG 12 , SG 14 , and SG 16  in accordance with the order of display each for a certain time period (e.g., for 1 second) on the touch screen  63 , and after that, the display control part  12  displays the setting screen SG 17  (see  FIG. 11 ) which is displayed last, on the touch screen  63 . 
     With such an operation, since all the setting screens SG 12  to SG 17  from the setting screen SG 12  which is displayed first during the setting operation period TM to the setting screen SG 17  which is displayed last are displayed on the touch screen  63  in response to the non-display instruction RC 2  in the order of display during the setting operation period TM, the user can recognize the setting screens SG 12  to SG 17  which are displayed during the setting operation period TM in the order of display. 
     Alternatively, some (two or more) setting screens among all the setting screens displayed during the setting operation period TM may be sequentially displayed. Specifically, individual setting screens SG (e.g., SG 14 , SG 16 , and SG 17 ) from the setting screen SG (e.g., SG 14 ) which is displayed a predetermined number (e.g., two) before the setting screen SG 17  which is displayed last during the setting operation period TM to the setting screen SG 17  which is displayed last may be sequentially displayed on the touch screen  63 . 
     Further alternatively, the information display screen IG to be displayed after the job list screen JG is hid may be determined in accordance with whether or not any setting screen SG is being displayed on the touch screen  63  when the display instruction RC 1  for the job list screen JG is received. Hereinafter, this variation will be discussed with reference to  FIG. 15 . 
     In this variation, especially, the operations of Steps S 79  to S 81  of  FIG. 15  are different from the operation of corresponding Step S 19  (see  FIG. 5 ) in the first preferred embodiment. In Steps S 71  to S 78  and Step S 82  of  FIG. 15 , the same operations are performed as those in Steps S 11  to S 18  and Step S 20  of  FIG. 5 , respectively. 
     Specifically, in Step S 79 , it is determined whether or not any setting screen SG is being displayed on the touch screen  63  when the display instruction RC 1  for the job list screen JG is received. When the display instruction RC 1  is received while the setting screen SG is being displayed, the process goes to Step S 80 , and when the display instruction RC 1  is received while no setting screen SG is being displayed, the process goes to Step S 81 . 
     In Step S 80 , in response to the non-display instruction RC 2 , the display control part  12  hides the job list screen JG and displays the setting screen SG 17  (see  FIG. 11 ) which is displayed last during the setting operation period TM, as the information display screen IG on the touch screen  63 . 
     Thus, in the case where the display instruction RC 1  for the job list screen JG is received while the setting screen SG (SG 17 ) is being displayed on the touch screen  63 , when the non-display instruction RC 2  for the job list screen JG is received while the job list screen JG is being displayed, the job list screen JG is hid and the setting screen SG (SG 17 ) is displayed in response to the non-display instruction RC 2 . 
     On the other hand, in Step S 81 , in response to the non-display instruction RC 2 , the display control part  12  hides the job list screen JG and displays the list screen LG of operation history on the setting operation(s) (see  FIG. 14 ) as the information display screen IG on the touch screen  63 . 
     Thus, in the case where the display instruction RC 1  for the job list screen JG is received while no setting screen SG is being displayed on the touch screen  63 , when the non-display instruction RC 2  for the job list screen JG is received while the job list screen JG is being displayed, the job list screen JG is hid and the list screen LG of operation history of the setting operation(s) is displayed in response to the non-display instruction RC 2 . 
     In such an aspect of the variation, since the setting screen SG (SG 17 ) which was being displayed is displayed again in response to the non-display instruction RC 2  in the case where the display instruction RC 1  is received while the setting screen SG (SG 17 ) is being displayed, it is possible to easily resume the setting operation using the setting screen SG On the other hand, since the list screen LG is displayed in response to the non-display instruction RC 2  in the case where the display instruction RC 1  is received while no setting screen SG is being displayed, the user can easily grasp the operations performed during the setting operation period TM. Further, it is also possible to easily call up the setting screen relating to the operation performed during the setting operation period TM, by using the list screen LG. 
     Further, though the operation history information data TB (TB 1 ) is updated both in the cases where the setting screen SG is displayed and where the setting of mode is changed in the setting screen SG in the above-discussed preferred embodiments, this is only one exemplary case. 
     For example, the operation history information data TB (TB 2 ) may be updated only in the case where the setting of mode is changed in the setting screen SG. Specifically, among the four set items (“Color”, “Paper”, “Duplex/Combine”, and “Finishing”), only the two set items (“Color” and “Duplex/Combine”) on which the setting details are changed during the setting operation period TM may be recorded into the operation history information data TB 2 . In this case, the history recording part  13  has only to record information of the “Set Item”, the “Change of Settings” (setting change history information), and the “Setting Details” into the operation history information data TB 2  and does not have to record any information of the “Display”, as shown in  FIG. 16 . 
     Furthermore, the display control part  12  displays the setting screen SG 17  which is displayed last during the setting operation period TM as the information display screen IG on the basis of the information of the “Display” (display history information) (see  FIG. 4 ) recorded in the operation history information data TB 1  in Step S 19  of  FIG. 5  in the first preferred embodiment, this is only one exemplary case. 
     For example, the display control part  12  may display the setting screen (referred to also as the last setting screen (in more detail, the setting screen relating to the set item changed last)) SG 16  relating to the set item which is changed last during the setting operation period TM, as information display screen IG on the touch screen  63 . The setting screen relating to the set item changed last may be determined and displayed on the basis of the setting change history information (information recorded in “Change of Settings”, or the like) recorded in the operation history information data TB 1  (see  FIG. 4 ) or the operation history information data TB 2  (see  FIG. 16 ). With this operation, the user can easily resume the setting operation by using the setting screen SG 16  relating to the set item which is changed last. 
     Alternatively, the display control part  12  may display the setting screen (referred to also as the first setting screen (in more detail, the setting screen relating to the set item changed first)) SG 12  relating to the set item which is changed first during the setting operation period TM, as information display screen IG on the touch screen  63 . The setting screen relating to the set item changed first may be determined and displayed on the basis of the setting change history information recorded in the operation history information data TB 1  (see  FIG. 4 ) or the operation history information data TB 2  (see  FIG. 16 ). With this operation, the user can easily recognize the change of setting which is performed first during the setting operation period TM by using the setting screen SG 12  relating to the set item which is changed first. 
     Similarly, the display control part  12  may sequentially display two or more setting screens SG 12  and SG 16  (the setting screen S 12  relating to the set item changed first and the setting screen SG 16  relating to the set item changed last) relating to the set items which are changed during the setting operation period TM, on the touch screen  63  in the order of change of setting. The order of change of settings may be determined on the basis of the setting change history information recorded in the operation history information data TB 1  (see  FIG. 4 ) or the operation history information data TB 2  (see  FIG. 16 ). With this operation, the user can sequentially recognize the changes of settings which are performed during the setting operation period TM in the order of change of settings. 
     Further, though the idea of the present invention is applied to an image forming system formed of a single image forming apparatus  1  in the above-discussed preferred embodiments, this is only one exemplary case. The idea of the present invention may be applied to, for example, an image forming system formed of a plurality of apparatuses (e.g., a computer and a printer) as show in  FIG. 17 . 
       FIG. 17  is a schematic view showing a constitution of an image forming system  100  in accordance with this variation. The image forming system  100  comprises a printer  70  and a computer  90 . 
     The printer  70  is connected to the computer  90  through the network NW and can transmit and receive data to/from the computer  90 . The network NW includes a LAN (Local Area Network) and various networks such as the internet. 
     The printer  70 , especially, serves as a printing device for performing a print job from the computer  90 . Specifically, the computer  90  sends a print job to the printer  70  through a printer driver (software program) PG 2  or the like which is installed therein. On the other hand, the printer  70  receives the print job sent from the computer  90  and executes the print job. With this operation, the printer  70  performs a printing process. 
     Specifically, as shown in  FIG. 17 , the printer  70  comprises a printing part  73 , a communication part  74 , and the like. The printing part  73  and the communication part  74  are processing parts which perform the same operations as the printing part  3  and the communication part  4  of  FIG. 2  do, respectively. 
     the computer  90  is a personal computer and comprises an input/output part  96 , a communication part  94 , and the like. The input/output part  96  has an operation input part  96   a  for receiving an input which is given to the computer  90  and a display part  96   b  for displaying various information thereon. For example, a keyboard, a mouse, and the like are provided as the operation input part  96   a , and a liquid crystal display and the like are provided as the display part  96   b . The communication part  94  is a processing part which performs the same operation as the communication part  4  of  FIG. 2  does. 
     In the image forming system  100 , the computer  90  implements the above idea by using the printer driver PG 2 . Specifically, the computer  90  can display a setting screen SG for mode setting relevant to the printer  70  on the display part  96   b  and display a job list screen JG on running jobs of the printer  70  on the display part  96   b , by executing the printer driver PG 2 . In more detail, by executing the printer driver PG 2 , processing parts which are the same as the input control part  11 , the display control part  12 , the history recording part  13 , and the like are implemented in the computer  90 , and by using the processing parts  11 ,  12 ,  13 , and the like, the same operations relating to the display on the display part  96   b , and the like, as discussed in the preferred embodiments and the like are performed. The printer driver PG 2  may be acquired via various portable (in other words, non-transitory) computer-readable recording media (a USB memory, a CD-ROM, or the like). Alternatively, the printer driver PG 2  may be downloaded via the network or the like and installed into the computer  90 . 
     In more detail, the computer  90  selectively displays the setting screen SG for various modes and the job list screen JG on the display part  96   b.    
     When the non-display instruction RC 2  for the job list screen JG is received while the job list screen JG is being displayed on the display part  96   b , the computer  90  hides the job list screen JG and displays the information display screen IG on the display part  96   b.    
     The same applies to the other operations. Relating to the display on the display part  96   b , performed are the same operations as the above-discussed operations relating to the display on the touch screen  63 . 
     In such an aspect of the variation, the same effect as that of the above-discussed preferred embodiments and the like can be produced. 
     While the invention has been shown and described in detail, the foregoing description is in all aspects illustrative and not restrictive. It is therefore understood that numerous modifications and variations can be devised without departing from the scope of the invention.