Patent Publication Number: US-2010123940-A1

Title: Image forming apparatus and image forming method

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application is based upon and claims the benefit of U.S. Provisional Application No. 61/115,218, filed on Nov. 17, 2008. 
    
    
     TECHNICAL FIELD 
     Described herein relates to an image forming apparatus and an image forming method, and, more particularly to an image forming apparatus and an image forming method with which a user can correctly process duplex printing, stapling, and 2-in-1 printing without performing complicated designation of a direction in which an original document is placed and a direction of a sentence. 
     BACKGROUND 
     As a method for a user to realize intended stapling using an image forming apparatus, there is known a technique with which the user designates a combination of a direction of an original document and a direction of a sentence (JP-A-2003-145879). 
     In the technique disclosed in JP-A-2003-145879, the user designates a document direction and a sentence direction and selects a pattern of stapling that can be realized in the designated document direction and sentence direction. Therefore, the user needs to understand what a screen for selecting directions of an original document and a sentence to be displayed and a pattern screen for realizable stapling mean. 
     SUMMARY 
     Described herein relates to an image forming apparatus including: an image reading unit configured to read a document image; a document-direction detecting unit configured to detect a document direction representing whether a sub-scanning direction in reading the document image is a short side direction or a long side direction of an original document; a copying-function designating unit configured to designate, as a copying function, a form for copying the document image on a sheet; an editing unit configured to edit the read document image as an image corresponding to the designated copying function; a copying unit configured to copy the edited image on the sheet; and a sheet-direction acquiring unit configured to acquire a sheet direction representing whether a conveying direction of the sheet conveyed to the copying unit to copy the image is the short side direction or the long side direction of the sheet, wherein the editing unit executes processing including rotation or reduction on the document image on the basis of the document direction, the sheet direction, and the designated copying function. 
     Described herein relates to an image forming apparatus including: an image reading unit configured to read a document image; a sentence-direction detecting unit configured to detect a sentence direction indicating whether an original document is a portrait document or a landscape document; a document-direction detecting unit configured to detect a document direction representing whether a sub-scanning direction in reading the document image is a short side direction or a long side direction of the original document; a copying-function designating unit configured to designate, as a copying function, a form for copying the document image on a sheet and collectively finishing plural sheets; an editing unit configured to edit the read document image as an image corresponding to the designated copying function; a copying unit configured to copy the edited image on the sheet; a sheet-direction acquiring unit configured to acquire a sheet direction representing whether a conveying direction of the sheet conveyed to the copying unit to copy the image is the short side direction or the long side direction of the sheet; and an output unit configured to convey the copied sheet to a finishing unit to finish the sheet, wherein the editing unit executes processing including rotation on the document image on the basis of the sentence direction, the document direction, the sheet direction, and the designated copying function. 
     Described herein relates to an image forming apparatus including: an image reading unit configured to read a document image; a sentence-direction detecting unit configured to detect a sentence direction indicating whether an original document is a portrait document or a landscape document; a document-direction detecting unit configured to detect a document direction representing whether a sub-scanning direction in reading the document image is a short side direction or a long side direction of the original document; a copying-function designating unit configured to designate, as a copying function, a form for copying the document image on a sheet and a form for collectively finishing copied plural sheets; an editing unit configured to edit the read document image as an image corresponding to the designated copying function; a copying unit configured to copy the edited image on the sheet; a sheet-direction acquiring unit configured to acquire a sheet direction representing whether a conveying direction of the sheet conveyed to the copying unit to copy the image is the short side direction or the long side direction of the sheet; and an output unit configured to convey the copied sheet to a finishing unit to finish the sheet, wherein the editing unit executes processing including rotation or reduction on the document image on the basis of the sentence direction, the document direction, the sheet direction, and the designated copying function. 
     Additional objects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objects and advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out hereinafter. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention, and together with the general description given above and the detailed description of the embodiments given below, serve to explain the principles of the invention. 
         FIG. 1  is a sectional view of a schematic configuration of an image forming apparatus; 
         FIG. 2  is a diagram of a control panel of an MFP; 
         FIG. 3  is diagram of a setting screen example of a display unit; 
         FIGS. 4A to 4D  are diagrams of directions of original documents and directions of sentences designated by a user when the user sets the original documents on a document table; 
         FIGS. 5A to 5H  are diagrams of directions of original documents for stapling with respect to combinations of sentence directions, document directions, and sheet directions; 
         FIGS. 6A to 6H  are diagrams of directions of original documents for duplex printing with respect to combinations of sentence directions, document directions, and sheet directions; 
         FIGS. 7A to 7H  are diagrams of directions of original documents for 2-in-1 printing with respect to combinations of sentence directions, document directions, and sheet directions; 
         FIG. 8  is a diagram of blocks for controlling image forming operation of an image forming apparatus according to an embodiment of the present invention; and 
         FIG. 9  is a flowchart of schematic copying operation in the image forming apparatus according to the embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     An image forming apparatus according to an embodiment of the present invention is explained below with an MFP (Multi Function Peripheral)  100  as an example. 
     The MFP  100  is a digital multi function peripheral for comprehensively utilizing functions of various kinds of office equipment. The MFP  100  has not only a function of scanning, reading, and copying an image at designated resolution and sheet size but also various functions such as an image transmitting and receiving function by facsimile, an image transmitting and receiving function by email, and a printed image transmitting and receiving function via a network. 
       FIG. 1  is a sectional view of a schematic configuration of the MFP  100 . The MFP  100  includes an image forming apparatus main body  110 , a sheet post-processing apparatus  150 , and an image reading apparatus  200 . 
     The image reading apparatus  200  includes a main body housing  202 , a document table  203 , and a document feeder  205 . The document table  203  is set in an upper part of the main body housing  202 . A document feeder  205  is set on the document table  203 . The document feeder  205  feeds an original document to the document table  203  and also functions as a document pressing plate that presses the original document to set the original document in close contact with the document table  203 . The document feeder  205  is openable and closable. 
     The main body housing  202  includes an exposing and scanning optical system  222  including a first traveling member  217 , a second traveling member  218 , a lens  219 , and an image reading unit  220 . The first traveling member  217  is mounted with a light source  217   a  and a mirror  217   b . The second traveling member  218  is mounted with a mirror  218   a  and a mirror  218   b.    
     The operation of the exposing and scanning optical system  222  in reading an original document placed on the document table  203  is explained. The first traveling member  217  and the second traveling member  218  move in a left-to-right direction (a sub-scanning direction) of the figure. The light source  217   a  on the first traveling member  217  irradiates light on the original document placed on the document table  203 . The light reflected by the original document is sequentially reflected by the mirror  217   b  on the first traveling member  217  and the mirrors  218   a  and  218   b  on the second traveling member  218  and made incident on the lens  219 . 
     The lens  219  condenses the incident light from the second traveling member  218  and irradiates the light on the image reading unit  220 . The image reading unit  220  includes a CCD (Charge Coupled Device) as a photoelectric conversion element and an image processing unit. The image processing unit executes processing such as shading correction on an electric signal photoelectrically converted by the CCD and outputs image data (an image signal). 
     When an original document  400  is placed on a document tray  206  of the document feeder  205 , the first traveling member  217  and the second traveling member  218  maintain a state in which the traveling members are stopped in predetermined reading positions. When the document  400  is conveyed on the document table  203  and passes over the reading positions, an image of the document  400  is read. Since operation after this is the same as the operation explained above, detailed explanation of the operation is omitted. 
     The image forming apparatus main body  110  can form a monochrome image and a color image. The image forming apparatus main body  110  includes a sheet storing unit  112  that stores sheets and an image forming unit  113  that forms an image on a sheet. 
     The image forming unit  113  includes a rotating transfer drum unit  114 . A charging unit  115 , an image exposing unit  116 , a developing unit  117 , a transfer unit  118 A, a charge removing unit  118 B, and a cleaning unit  119  are arranged around the transfer drum unit  114 . 
     The operation of the image forming unit  113  is explained below. 
     The charging unit  115  charges the surface of the transfer drum unit  114 . The image exposing unit  116  exposes and scans the surface of the transfer drum unit  114  with a laser on the basis of image data sent from the image reading apparatus  200  or image data transmitted via facsimile, email, or a network. The developing unit  117  forms a reversely-developed toner image on the surface of the transfer drum unit  114 . 
     A sheet fed from the sheet storing unit  112  is conveyed to a transfer position of the image forming unit  113 . The transfer unit  118 A transfers the toner image onto the sheet. The charge removing unit  118 B removes charges of the sheet. A fixing unit  120  fixes the toner image on the sheet with heat and pressure. A paper discharge unit  111  discharges the sheet to the sheet post-processing apparatus  150 . The cleaning unit  119  removes a toner remaining on the surface of the transfer drum unit  114 . Consequently, the image forming unit  113  is prepared for the next image forming processing. 
     The operation of duplex printing is explained. 
     Duplex printing in the image forming apparatus main body  110  is designated by an input instruction through an operation panel by a user or a print instruction from an external apparatus such as a PC connected to the MFP  100  via a LAN. When the duplex printing is instructed, the sheet having the toner image transferred thereon and discharged from the fixing unit  120  is sent to a reversal path  122  by a branching member  121 . A traveling direction of the sheet is reversed and the front and rear of the sheet are reversed in the reversal path  122 . The reversed sheet is conveyed to a duplex conveying path  123  and guided to the image forming unit  113  again. An image is formed on the rear side of the sheet in an image forming process same as that for the front side. The sheet having the images formed on both the front and rear sides hereof is discharged from the paper discharge unit  111  and carried into the sheet post-processing apparatus  150 . 
     The sheet post-processing apparatus  150  includes a puncher unit  151 , a sheet separating unit  152 , a second post-processing unit  153 , and a first post-processing unit  154 . The puncher unit  151  performs post-processing such as punching. The sheet separating unit  152  directs sheets to the second post-processing unit  153  or the first post-processing unit  154 . The second post-processing unit  153  performs post-processing such as saddle stapling and saddle folding. The first post-processing unit  154  performs post-processing such as paper discharge from normal print processing, sorting of sheets, and stapling of an end of a sheet bundle. 
     The sheet post-processing apparatus  150  conveys the sheets to the second post-processing unit  153  or the first post-processing unit  154  and applies the post-processing to the sheets according to an input instruction through the operation panel by the user or a print instruction from the external apparatus such as the PC connected to the MFP  100  via the LAN. 
     The first post-processing unit  154  includes a branching member  155 , a roof tray  156 , a processing tray  157 , a stapler  158 , a waiting tray  159 , and a paper discharge tray  160 . 
     The branching member  155  switches a conveying path according to selected post-processing. Normal print sheets are sequentially stacked on the roof tray  156 . A sheet bundle to be stapled is placed on the processing tray  157 . The stapler  158  staples the sheet bundle. The waiting tray  159  temporarily accumulates sheets, which are conveyed thereto, in order to secure time necessary for stapling and sheet carry-out. The stapled or sorted sheet bundle is stacked on the paper discharge tray  160 . 
     The operation of the stapling is explained below. 
     When the stapling for the end of the sheet bundle is performed, the sheet separating unit  152  delivers the sheets to the first processing unit  154 . In the first processing unit  154 , the branching member  155  deflects the sheets in the downward direction and discharges the sheets to the waiting tray  159 . The waiting tray  159  temporarily accumulates the sheets, which are sequentially conveyed thereto, to adjust a flow of sheet conveyance. When a predetermined number of sheets are accumulated in the waiting tray  159 , the sheets are discharged to the processing tray  157 . When a predetermined number of sheets are aligned and accumulated in the processing tray  157 , the stapler  158  executes the stapling. A sheet bundle stapled by the stapler  158  is carried out to and stacked in the paper discharge tray  160 . 
       FIG. 2  is a diagram of a control panel  301  of the MFP  100 . The user gives an instruction to the MFP  100  via the control panel  301 . Hard keys such as function keys and a ten key and a display unit  302  are provided in the control panel  301 . The user performs function inputs for copying, facsimile, and the like using the function keys and performs number input using the ten key. The display unit  302  displays a state of the MFP  100  and also functions as a touch panel. 
       FIG. 3  is a diagram of a setting screen example of the display unit  302 . The user can perform detailed setting for each of functions such as copying on the display unit  302 . On a “basic” tab screen shown in  FIG. 3 , only frequently used settings are displayed for each of the functions. For example, as the frequently used settings, besides setting for cassettes (A4, A4-R, A3, and B5) and setting for colors (full color, black, and auto-color), buttons for selecting “duplex”, “2-in-1”, and “stapling” operations are displayed. 
     Operations executed when “duplex”, “2-in-1”, and “stapling” are selected are explained below. When “duplex” is selected, operation for performing the duplex printing from a one-side document is executed. When “2-in-1” is selected, a two-page document is reduced to a half and output as one page. When “stapling” is selected, the stapling is applied to one place at an upper left corner of a sheet bundle. Since processing can be designated only by button operation in this way, the user can easily realize a frequently used finish without performing complicated setting. 
     In the duplex, 2-in-1, and stapling settings, in some case, detailed setting is required. For example, in the duplex printing, there are plural setting items such as whether an original document is a one-side document or a both-side document. However, in this embodiment, the operations defined by the “basic” tab are treated. Therefore, a user requiring detailed setting performs the detailed setting from an “application” tab screen. 
       FIGS. 4A to 4D  are diagrams of directions of original documents and directions of sentences designated by the user when the user sets the original documents on the document table  203 . A main scanning direction of scanning of the original documents is an up-to-down direction in the figure and a sub-scanning direction of the scanning is a left-to-right direction in the figure. 
     In  FIG. 4A , an original document  401  represents that the original document  401  is a portrait document and is placed sideways when the original document  401  is read. The portrait document is an original document in which a sentence can be correctly shown when the original document is arranged to be long in the vertical direction. “Placing the original document sideways” means that the original document is placed such that a side in the sub-scanning direction is long during scanning or paper feeding. 
     In  FIG. 4B , an original document  402  represents that the original document  402  is a portrait document and is placed lengthwise when the original document  402  is read. “Placing the original document lengthwise” means that the original document is placed such that a side in the sub-scanning direction is short during scanning or paper feeding. In  FIG. 4C , an original document  403  represents that the original document  403  is a landscape document and is placed sideways when the original document  403  is read. The landscape document is an original document in which a sentence is correctly shown when the original document is arranged to be long in the horizontal direction. In  FIG. 4D , an original document  404  represents that the original document  404  is a landscape document and is placed lengthwise when the original document  404  is read. 
     Combinations of sentence directions (a portrait direction and a landscape direction) and document directions (lengthwise and sideways) are the four sets explained above. Further, sheets set in the sheet storing unit  112  are also placed lengthwise and sideways. Sheet directions in the sheet storing unit  112  are only these two sets (lengthwise and sideways). Therefore, combinations of the sentence directions, the document directions, and the sheet directions are eight sets (=4 sets×2 sets) in total. 
       FIGS. 5A to 5H  are diagrams of directions of original documents for stapling with respect to the combinations of the sentence directions, the document directions, and the sheet directions. The original documents  401  to  404  represent the combinations of the sentence directions and the document directions. On the other hand, sheets  501  to  508  represent sheet directions designated when the sheets  501  to  508  are sent to the sheet post-processing apparatus  150  for execution of the stapling. 
     For example, in  FIG. 5A , the original document  401  is the portrait document and is placed sideways when the original document  401  is read. Since a sheet direction is sideways, the sheet  501  is sent to the sheet post-processing apparatus  150  in a sideways state. In this case, the sheet  501  needs to be printed as shown in  FIG. 5A . 
     On the other hand, in  FIG. 5E , as in  FIG. 5A , the original document  401  is also a portrait document and is placed sideways when the original document  401  is read. However, a sheet direction is lengthwise. Therefore, the sheet  505  is sent to the sheet post-processing apparatus  150  in a lengthwise state. In this case, the sheet  505  needs to be printed as shown in  FIG. 5E . 
     In  FIGS. 5B and 5F ,  FIGS. 5C and 5G , and  FIGS. 5D and 5H , sheet directions are different from each other. 
     In this embodiment, standard stapling finish is stapling at one place at an upper left corner with respect to a document direction. Because of a mechanism of the stapler  158  in the sheet post-processing apparatus  150 , sheets  501  to  508  need to be sent to the sheet post-processing apparatus  150  such that stapling positions are set on the right sides of the sheets  501  to  508  shown in the figures. 
     Referring to  FIGS. 5A to 5H , it is seen that, in order to realize the stapling according to this embodiment, images only have to be respectively formed as indicated by the sheets  501  to  508  with respect to combinations of sentence directions, document directions, and sheet directions. 
     Specifically, when document directions and sheet directions are the same ( FIGS. 5A and 5B  and  FIGS. 5C and 5D ), read images are rotated 180 degrees and printed. When document directions and sheet directions are different, sentence directions and the document directions are checked. 
     When a sentence direction is portrait and a document direction is sideways ( FIG. 5E ), a read image is rotated 90 degrees to the left and printed on a portrait sheet. When a sentence direction is portrait and a document direction is lengthwise ( FIG. 5G ), a read image is rotated 90 degrees to the right and printed on a landscape sheet. 
     When a document direction is landscape and a document direction is sideways ( FIG. 5F ), a read image is rotated 90 degrees to the right and printed on a portrait sheet. When a sentence direction is landscape and a document direction is lengthwise ( FIG. 5H ), a read image is rotated 90 degrees to the left and printed on a landscape sheet. 
     In this way, in the stapling, a printing method depends on a combination of a sentence direction, a document direction, and a sheet direction. 
     The operation of the duplex printing is explained below. 
       FIGS. 6A to 6H  are diagrams of directions of original documents for the duplex printing with respect to combinations of sentence directions, document directions, and sheet directions. The original documents  401  to  404  represent the combinations of the sentence directions and the document directions. Sheets  601  to  608  represent results obtained by performing the duplex printing. 
     In the sheets  601  to  608  shown in the figure, the left side represents printing results on front sides and the right side represents printing results on rear sides. A state in which sheets are superimposed symmetrically along a dotted line in the center represents a sheet actually subjected to the duplex printing. 
     For example, in  FIG. 6A , the original document  401  is a portrait document and is placed sideways when the original document  401  is read. After the front side of the sheet  601  is printed in a sideways state, a traveling direction of the sheet is reversed and the front and rear of the sheet  601  is reversed in the reversal path  122 . The sheet  601  is conveyed to the image forming unit  113  via the duplex conveying path  123  and the rear side of the sheet is printed. The front and rear sides of the sheet  601  have to be printed as shown in  FIG. 6A . 
     On the other hand, in  FIG. 6E , as in  FIG. 6A , the original document  401  is a portrait document and is placed sideways when the original document  401  is read. However, a sheet direction is lengthwise. Therefore, the sheet  605  is sent to the image forming unit  113  in a lengthwise state and printing is executed. Thereafter, a traveling direction of the sheet  605  is reversed and the front and rear of the sheet  605  reversed in the reversal path  122 . The sheet  605  is conveyed to the image forming unit  113  again via the duplex conveying path  123  and the rear side of the sheet  605  is printed. The front and rear sides of the sheet  605  have to be printed as shown in  FIG. 6E . 
     In  FIGS. 6B and 6F ,  FIGS. 6C and 6G , and  FIGS. 6D and 6H , sheet directions are also different. 
     Referring to  FIGS. 6A to 6H , it is seen that, in order to realize the duplex printing according to this embodiment, images only have to be respectively formed as indicated by sheets  601  to  608  with respect to combinations of document directions and sheet directions. 
     Specifically, when both a document direction and a sheet direction are sideways ( FIGS. 6A and 6B ), during front side printing, a read image is directly printed and, during rear side printing, the image is rotated 180 degrees and printed. When both a document direction and a sheet direction are lengthwise ( FIGS. 6C and 6D ), a read image is directly printed both during front side printing and during rear side printing. 
     When a document direction is sideways and a sheet direction is lengthwise ( FIGS. 6E and 6F ), a read image is rotated 90 degrees to the right and printed both during front side printing and during rear side printing. When a document direction is lengthwise and a sheet direction is sideways ( FIGS. 6G and 6H ), during front side printing, a read image is rotated 90 degrees to the left and printed and, during rear side printing, the read image is rotated 90 degrees to the right and printed. 
     In this way, in the duplex printing, a printing method depends on a combination of a document direction and a sheet direction without depending on a sentence direction. 
     The operation of the 2-in-1 printing is explained below. 
       FIGS. 7A to 7H  are diagrams of directions of original documents for the 2-in-1 printing with respect to combinations of sentence directions, document directions, and sheet directions. The original documents  401  to  404  represent the combinations of the sentence directions and the document directions. On the other hand, sheets  701  to  708  represent results obtained by performing the 2-in-1 printing. 
     For example, in  FIG. 7A , the original document  401  is a portrait document and is placed sideways when the original document  401  is read. Since a sheet direction of the sheet  701  is sideways, a read image is rotated 90 degrees to the right and reduced and a pair of the reduced images are joined and printed on the sheet  701 . 
     On the other hand, in  FIG. 7E , as in  FIG. 7A , the original document  401  is a portrait document and is placed sideways when the original document  401  is read. 
     However, a sheet direction of the sheet  705  is lengthwise. Therefore, a read image is directly reduced and a pair of the reduced images are joint and printed on the sheet  701 . 
     In  FIGS. 7B and 7F ,  FIGS. 7C and 7G , and  FIGS. 7D and 7H , sheet directions are also different. 
     Referring to  FIGS. 7A to 7H , it is seen that, in order to realize the 2-in-1 printing according to this embodiment, images only have to be respectively formed as indicated by the sheets  701  to  708  with respect to combinations of document directions and sheet directions. 
     Specifically, when both a document direction and a sheet direction are sideways ( FIGS. 7A and 7B ), a read image is rotated 90 degrees to the right and reduced and a pair of the reduced images are joined and printed. When both a document direction and a sheet direction are lengthwise ( FIGS. 7C and 7D ), a read image is rotated 90 degrees to the left and reduced and a pair of the reduced images are joint and printed. When a document direction and a sheet direction are different ( FIGS. 7E ,  7 F,  7 G, and  7 H), a read image is directly reduced without being rotated and a pair of the reduced images are joined and printed. 
     In this way, in the 2-in-1 printing, a printing method depends on a combination of a document direction and a sheet direction without depending on a sentence direction. 
     As explained above, concerning the standard duplex, stapling, and 2-in-1 setting, if a document direction, a sentence direction, and a sheet direction are determined, a control method is uniquely determined. The same holds true when duplex printing, stapling, and 2-in-1 printing are combined. When the duplex printing and the 2-in-1 printing are combined, for example, the control method explained above only has to be executed in order of, for example, the 2-in-1 printing and the duplex printing. When the duplex printing and the stapling are combined or when the 2-in-1 printing and the stapling are combined, as explained with reference to  FIG. 5 , it is sufficient to control printing such that a stapling position is in the predetermined position and send a sheet to the sheet post-processing apparatus  150 . 
     Therefore, if a document direction, a sentence direction, and a sheet direction are automatically detected, the user can obtain a desired output without inputting a document direction and a sentence direction and inputting details of finish setting as in the past. 
       FIG. 8  is a diagram of blocks for controlling image forming operation of the MFP  100  according to this embodiment. 
     The image reading apparatus  200  includes an image reading unit  220 , a sentence-direction detecting unit  803 , and a document size and direction detecting unit  804 . The image reading unit  220  executes processing such as shading correction on an electric signal photoelectrically converted by a CCD and outputs image data (an image signal). 
     The sentence-direction detecting unit  803  detects a sentence direction using a layout analysis technique for an image. The sentence-direction detecting unit  803  divides image data into belt-like areas in vertical and horizontal two directions and counts the number of pixels present in the respective belt-like areas. The sentence-direction detecting unit  803  recognizes a character direction from a difference between the number of pixels in the belt-like area in the vertical direction and the number of pixels in the belt-like area in the horizontal direction and detects a direction of a sentence. 
     When an original document is set on the document table  203 , the document size and direction detecting unit  804  detects an image size and an image direction using an optical sensor. When the document feeder  205  is used, the document size and direction detecting unit  804  detects paper feeding direction size from paper passing time, detects paper width from a width detection sensor (an optical sensor), and detects a document size and a document direction from these kinds of information. The document size and direction detecting unit  804  may specify an image size and an image direction from a read image. 
     The image forming apparatus main body  110  includes an image editing unit  812 , an image memory  813 , the image forming unit  113 , a copying-function designating unit  815 , a sheet size and direction setting unit  816 , and a sheet size and direction detecting unit  817 . 
     The copying-function designating unit  815  acquires information concerning which of the copying functions “duplex”, “2-in-1”, and “stapling” is selected on the “basic” tab screen of the control panel  301 . Not only one copying function but also plural copying functions can be collectively selected. The sheet size and direction setting unit  816  acquires a sheet size and a sheet direction designated by the user on the control panel  301 . The sheet size and direction detecting unit  817  automatically acquires a sheet size and a sheet direction for each of the cassettes of the sheet storing unit  112  selected on the control panel  301 . For example, the sheet size and direction detecting unit  817  detects a sheet size and a sheet direction from a position of a guide that holds sheets, which are stored in the cassette, from sides such that the sheets are stabilized. 
     The image editing unit  812  applies processing such as rotation or reduction to the read image data according to the selected copying function and the detected sentence direction, document direction, and sheet direction and edits an image for exposing and scanning a transfer drum surface. The image memory  813  is a buffer memory that stores the image data processed by the image reading apparatus  200  and the image editing unit  812 . The image forming unit  113  forms a toner image on the transfer drum surface and transfers the toner image onto a sheet. The image forming unit  113  delivers the sheet having the toner image transferred thereon to the sheet post-processing apparatus  150 . 
       FIG. 9  is a flowchart of schematic copying operation in the image forming apparatus according to this embodiment. 
     A flow of control is explained with reference to the flowchart shown in  FIG. 9 . In Act  901 , the image forming apparatus stays on standby until simplified copying is selected from the “basic” tab screen of the control panel  301 . If the simplified copying is selected in Act  901  (Yes in Act  901 ), in Act  902 , the copying-function designating unit  815  decides presence or absence of setting of duplex printing, stapling, or 2-in-1 printing. 
     When reading of an image is started according to operation by the user, in Act  903 , the document-direction detecting unit  803  and the document size and direction detecting unit  804  specify a document direction and a sentence direction. In Act  904 , the image editing unit  812  decides a combination of rotation and reduction of the image from setting information of duplex printing, stapling, and 2-in-1 printing and the document direction, the sentence direction, and a sheet direction and performs image editing operation. Since the image editing method is already explained with reference to  FIGS. 5A to 5H ,  FIGS. 6A to 6H  and  FIGS. 7A to 7H , redundant explanation of the method is omitted. 
     In Act  905 , the image forming unit  113  performs image forming operation on the basis of edited image data and executes processing such as duplex printing or stapling according to the setting. 
     As explained above, according to this embodiment, the user can surely perform a desired copying function without performing complicated designation of a document direction and a sentence direction and without performing detailed setting of a copying function. 
     The present invention is explained above with reference to the specific embodiment. However, it would be obvious to those skilled in the art that various alterations and modifications can be made without departing from the spirit and the scope of the present invention. 
     Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiment shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.