Patent Publication Number: US-7722183-B2

Title: Image recording apparatus

Description:
The entire contents of documents cited in this specification are incorporated herein by reference. 
   BACKGROUND OF THE INVENTION 
   The present invention generally relates to an image recording apparatus such as an inkjet printer, and in particular relates to an image recording apparatus having a platen capable of switching ink receiver arrangements, that may suitably be used in borderless printing with a recording medium being transported in a single-row or multiple-row arrangement. 
   In a case of an inkjet recording apparatus in which recording is performed by ejecting ink from a nozzle of a recording head while moving a carriage on which the recording head is mounted, back and forth, the carriage can be retracted from its recording position when pre-ejecting operation (or flushing) is performed to prevent the nozzle of the recording head from ink clogging. 
   In a case of an inkjet recording apparatus in which recording is performed by ejecting ink from a nozzle of a recording head while transporting the recording medium with the recording head being fixed, since it requires more space in the apparatus to retract the head from its recording position, an ink absorbing surface is provided on a platen that faces the head so that flushing can be performed against the ink absorbing surface, as described in JP 2003-341158A. 
   On the other hand, there has been a demand for capability of recording images up to full width of the recording medium to produce a so-called borderless print. In order to achieve such capability, the ink ejecting area of a recording head is required to be wider than the width of the recording medium. Therefore, when using a platen which is configured as described in JP 2003-341158A, in which a recording medium support surface is oriented toward the recording head, ink may be ejected outside the both edges of the recording medium, thus causing the platen to be stained by ink. 
   Moreover, it has been known that, as one option for increasing productivity, in various image recording apparatuses such as inkjet printers, a single apparatus is required to perform image recording onto a plurality of different width size recording media, or is required to transport multiple rows (multiple in a direction perpendicular to the transport direction) of the recording medium for image recording (drawing) or post treatment subsequent to the image recording. In the description, the direction perpendicular to the transport direction will be referred to as the width direction, and transporting multiple rows of recording medium will be referred to as the parallel transportation. 
   SUMMARY OF THE INVENTION 
   However, if a single apparatus performs image recording onto a plurality of different width recording media, as described above, a significant number of countermeasures are needed to prevent the above described ink stain, since a significant number of width sizes and their combinations are available. 
   The present invention has been made in order to solve the problems described above and an object of the present invention is to provide an image recording apparatus with a platen capable of switching ink receiver arrangements, that may suitably be used for borderless printing by ink-jetting, and that enables one single apparatus to perform image recording onto a plurality of different width size recording media, or allows multiple rows of recording medium to be transported in parallel for performing image recording (drawing) or post treatment subsequent to the image recording. 
   Another object of the present invention is to provide an image recording apparatus that is not susceptible to recording method of the recording head used in inkjet printing, in other words, that can easily be applicable to either the line head method, or the shuttle method. 
   In order to achieve the above objective, the present invention provides an image recording apparatus including: a recording head which ejects ink for image recording on one or more recording media; a rotatable platen which faces the recording head, extends in a direction perpendicular to a recording medium transport direction, and includes recording medium support surfaces supporting the one or more recording media during the image recording, respectively; driving means for rotating the rotatable platen; and control means for controlling the driving means so as to rotate the rotatable platen in such a way that a predetermined recording medium support surface selected from the recording medium support surfaces of the rotatable platen is stopped at a position facing the recording head in accordance with a transport pattern of the one or more recording media during the image recording, in which the recording medium support surfaces support the one or more recording media transported in accordance with different transport patterns, respectively and have ink receivers that receive the ink which is ejected from the recording head during the image recording and has reached outside both side edges of each of the supported one or more recording media in the recording medium transport direction and are disposed in positions corresponding to vicinities of both side edges of each of the supported one or more recording media. 
   Preferably, each of the recording medium support surfaces has suction holes for sucking and supporting the one or more recording media. 
   Preferably, the rotatable platen further includes an ink absorbing member surface having an ink absorbing member for receiving ink ejected as a pre-ejecting operation of the recording head prior to start of the image recording, and the control means further controls the driving means so as to rotate the rotatable platen in such a way that the ink absorbing member surface is stopped at a position facing the recording head prior to the start of the image recording in accordance with a recording head driving condition of the recording head. 
   Preferably, the predetermined recording medium support surface corresponds to a predetermined recording medium transport pattern selected from the different recording medium transport patterns and supports the one or more recording media transported in accordance with the predetermined recording medium transport pattern, and the ink receivers are disposed in respective positions corresponding to vicinities of both side edges of each of the one or more recording media transported in accordance with the predetermined recording medium transport pattern. 
   Preferably, each of the predetermined recording medium support surfaces corresponds to different recording medium transport patterns and supports the one or more recording media transported in accordance with each of the different recording medium transport patterns, and the ink receivers of each of the predetermined recording medium support surfaces are disposed in respective positions corresponding to vicinities of both side edges of each of the one or more recording media transported respectively in accordance with the different recording medium transport patterns to which each of the predetermined recording medium support surfaces corresponds. 
   The present invention also provides an image recording apparatus including: a recording head which ejects ink for image recording on one or more recording media; a rotatable platen which faces the recording head, extends in a direction perpendicular to a recording medium transport direction, and has recording medium support surfaces, each of the recording medium support surfaces corresponding to each of different recording medium transport patterns and supporting the one or more recording media transported in accordance with each of different recording medium transport patterns during the image recording; driving means for rotating the rotatable platen; and control means for controlling the driving means so as to rotate the rotatable platen in such a way that a predetermined recording medium support surface corresponding to a predetermined recording medium transport pattern selected from the different recording medium transport patterns is stopped at a position facing the recording head, in which the predetermined recording medium support surface has ink receivers that receive the ink which is ejected from the recording head during the image recording and has reached outside both side edges of each of the one or more recording media in the recording medium transport direction transported in accordance with the selected predetermined recording medium transport pattern and are disposed in positions corresponding to vicinities of both side edges of each of the transported one or more recording media. 
   Preferably, each of the recording medium support surfaces has suction holes for sucking and supporting the one or more recording media. 
   Preferably, the rotatable platen further includes an ink absorbing member surface having a ink absorbing member for receiving ink ejected as a pre-ejecting operation of the recording head prior to start of the image recording, and the control means controls the driving means so as to rotate the rotatable platen in such a way that the ink absorbing member surface corresponding is stopped at a position facing the recording head prior to the start of the image recording in accordance with a recording head driving condition of the recording head. 
   Preferably, each of the predetermined recording medium support surfaces has the ink receivers disposed in respective positions corresponding to vicinities of both side edges of each of the one or more recording media transported in accordance with the different recording medium transport patterns. 
   Preferably, the ink receivers disposed on each of the predetermined recording medium support surfaces correspond to two or more different recording medium transport patterns. 
   An embodiment according to the present invention achieves an image recording apparatus with a platen capable of switching ink receiver arrangements, that may suitably be used for borderless printing by ink-jetting, and that enables one single apparatus to perform image recording onto a plurality of different width size recording media, or allows multiple rows of recording medium to be transported in parallel for performing image recording (drawing) or post treatment subsequent to the image recording. 
   The image recording apparatus according to the present invention is not susceptible to the recording method of the recording head used in inkjet printing, in other words, that can easily be applicable to either the line head method, or the shuttle method. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     In the accompanying drawings: 
       FIG. 1  illustrates a schematic view of one example of a (inkjet) printer according to one embodiment of the present invention; 
       FIGS. 2A and 2B  illustrate a detailed configuration (Part 1) of a recording unit, which is a main part of an image recording section of a printer according to the embodiment, and  FIG. 2A  shows a top view, and  FIG. 2B  shows an explanatory view on Arrow Y-Y of  2 A; 
       FIGS. 3A and 3B  illustrate a detailed configuration (Part 2) of a recording unit, which is a main part of the image recording section of a printer according to the embodiment, and  FIG. 3A  shows a top view, and  FIG. 3B  shows an explanatory view on Arrow Y-Y of  3 A; 
       FIGS. 4A and 4B  illustrate a detailed configuration (Part 3) of a recording unit, which is a main part of the image recording section of a printer according to the embodiment, and  FIG. 4A  shows a top view, and  FIG. 4B  shows an explanatory view on Arrow Y-Y of  4 A; 
       FIGS. 5A and 55  illustrate a detailed configuration (Part 4) of a recording unit, which is a main part of the image recording section of a printer according to the embodiment, and  FIG. 5A  shows a top view, and  FIG. 5B  shows an explanatory view on Arrow Y-Y of  5 A; and 
       FIGS. 6A and 6B  illustrate a detailed configuration (Part 5) of a recording unit, which is a main part of the image recording section of a printer according to the embodiment, and  FIG. 6A  shows a top view, and  FIG. 6B  shows an explanatory view on Arrow Z-Z of  6 A. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   An image recording apparatus of the present invention will hereinafter be described in detail on the basis of a preferred embodiment shown in the accompanying drawings. 
     FIG. 1  shows a schematic view of an inkjet printer according to one embodiment of the present invention. 
   The inkjet printer (hereinafter simply referred to as the printer)  10  shown in  FIG. 1 , in order to generate a print, performs not only image recording by ink-jetting onto a recording sheet S as the recording medium, but also performs backprinting or surface processing as needed, so that photography equivalent quality is achieved. The printer  10  basically includes a recording sheet feeding section  12 , a backprinting unit  14 , an image recording section  16 , a surface processing section  18 , a cutting section  20 , and a discharging section  22 . 
   Also, the printer  10  includes a control section  24  for controlling and managing entire operation of the printer  10 , as well as for managing operation histories of the printer  10 . 
   It should be understood that the printer  10  may also include, in addition to those members shown in the drawings, a transport roller pair, a guide roller, a guide member, a sensor for detecting the recording sheet S, and other various members that are employed in known printers, as necessary. 
   The recording sheet feeding section  12  is a section for feeding the recording sheet S as the recording medium to the backprinting unit  14 , and includes a first loading section  30 , a second loading section  32 , a cut sheet loading section  34 , guide rollers  36 ,  38 , a cutter  40 , a sheet feeding roller  44 , and two transport roller pairs  50  ( 50   a ,  50   b ). 
   The first loading section  30  and the second loading section  32  load a recording sheet roll Sr formed of a long recording sheet S rolled around a core member, and feed the recording sheet roll Sr to the backprinting unit  14  (and subsequent sections), through the cutter  40  which will be described later. If the recording sheet S has an ink receiving layer, the ink receiving layer is oriented toward outside when being rolled. 
   Since the first loading section  30  and the second loading section  32  are the same in structure, except that the location in the printer  10  is different, similar components are denoted by same reference numerals, and only the first loading section  30  will be described below as the representative. 
   The first loading section  30  (second loading section  32 ) has two flange rotating rollers  46  and a feed roller pair  52 . The flange rotating rollers  46  are arranged in the transport direction with a predetermined space between them, and their rotating direction is aligned with the feeding direction of the recording sheet S (i.e., their axial direction is perpendicular to the document plane of  FIG. 1 ). 
   The feed roller pair  52  is a known transport roller pair. The flange rotating rollers  46  and the feed roller pair  52  are both engaged to a known rotation driving source (not shown) through which the flange rotating rollers  46  and the feed roller pair  52  are driven to rotate in a forward (feeding) or backward (rewinding) direction. 
   In the printer  10  shown in the drawing, the recording sheet roll Sr is held (in the axial direction) by two disk-shaped flanges F having a cylinder portion Fc therebetween, which will be inserted in the core material. The flanges F are then mounted on the two flange rotating rollers  46  so that the recording sheet roll Sr is loaded in a predetermined position of the printer  10  (the first loading section  30  and the second loading section  32 ). The outer diameter of the flange F is greater than the maximum outer diameter of applicable recording sheet rolls Sr. 
   If printing is performed in a two-row parallel transport mode which will be described later, two recording sheet rolls Sr, while being held by the flanges F, are mounted on the flange rotating rollers  46  in the axial direction (perpendicular to the document plane of  FIG. 1 ). 
   In the first loading section  30  (second loading section  32 ), the flange F is rotated and synchronized with the flange rotating rollers  46 , and the recording sheet S is transported by the feed roller  52  to allow the recording sheet S to be fed out from the recording sheet roll Sr. The flange F also serves as a guide member in feeding the recording sheet S. 
   It should be understood that in the practice of the present invention, the loading method of the recording sheet roll Sr is not limited to the above, and any other method available in various printers may be used. For example, a recording sheet roll Sr with its center being rotatably supported is housed in a magazine and the magazine is loaded to a predetermined loading position. 
   The recording sheet S of the recording sheet roll Sr which is loaded to the first loading section  30  is transported (fed) to the backprinting unit  14  through the cutter  40 , then to the image recording section  16 , while being guided by the guide roller  36 . The recording sheet S of the recording sheet roll Sr which is loaded to the second loading section is conveyed to the backprinting unit  14  through the cutter  40 , then to the image recording section  16 , while being guided by the guide roller  38 . 
   The cutter  40  may be a known Guillotine cutter. The cutter  40  may not be used for cutting the recording sheet S on an each print basis, rather, used for cutting the recording sheet S on an order basis, similar to shutting down the operation of the printer  10  in order to interrupt (abort) printing at a predetermined (preselected) timing. 
   In other words, in the printer  10  shown, when printing is performed onto the recording sheet S of the recording sheet roll Sr, backprinting is performed by the backprinting unit  14 , image recording is performed by the image recording section  16 , and surface treatment (if necessary) is performed by the surface processing section  18  onto the long recording sheet S as it is, and then the long recording sheet S is cut by the cutting section  20  to produce individual prints P. 
   Accordingly, when printing is performed using the recording sheet S of the recording sheet roll Sr, the recording sheet S is fed out from an active loading section of either the first loading section  30  or the second loading section  32  and transported along a predetermined route through the guide roller  36  or  38 , and cutter  40 , until its leading edge is positioned in a predetermined position (for example, a transport roller pair in the most upstream side of the image recording section  16 ), in a similar way as used in other known printers using a rolled recording medium (so called roll sheet). 
   If the recording sheet S is cut by the cutter  40 , and if the remaining recording sheet S is not used in the subsequent printing, the flange rotating rollers  46  and the feed roller pair  52  are inversely rotated so that the recording sheet S is retracted to a predetermined position. In this case, the flange F also serves as a guide for guiding the recording sheet S to allow the recording sheet S to be rewinded appropriately toward the recording sheet roll Sr. 
   The cut sheet loading section  34  is a section for loading cut sheet type recording sheets S, which are produced by cutting the long recording sheet S into a plurality of sheets each having a predetermined size. 
   The cut sheet type recording sheets S are accommodated in a known cassette  48  as used in various printers, and the cassette  48  is loaded in a predetermined position of the cut sheet loading section  34 , so that the cut sheet type recording sheets S are loaded in a predetermined position of the printer  10 . In the example shown in the drawings, it an ink receiving layer is provided, the cut sheet type recording sheets S are accommodated in the cassette  48  with the ink recording layer being oriented downward. 
   Each of the cut sheet type recording sheets S accommodated in the cassette  48  is then pulled out from the cassette  48  by the sheet feeding roller  44  which is a semilunar roller with a side peripheral surface cut into a plane shape. Then the cut sheet type recording sheet S is transported by the transport roller pairs  50   a  and  50   b , and fed to the backprinting unit  14  by, such as, a not-shown guide. 
   In the printer  10  shown in the drawing, there is no limitation on the recording sheet S, and any known recording sheet S (image receiving sheet (image receiving medium)) may be used. For example, a plan sheet, an inkjet recording sheet with a matte or glossy surface having an ink receiving layer, an inkjet recording sheet (refer to JP 2005-35050 A) having an ink receiving layer made of thermal plastic resin particles and a layer for absorbing pigment ink solvent provided underneath the ink receiving layer, and an inkjet recording sheet for photographic image quality printing that has an ink-philic thermal plastic resin layer as an ink receiving layer may be used. 
   Examples of thermal plastic resin that may be used for inkjet recording sheet for photographic image quality printing include poly acrylic ester, polycarbonate, polyacrylonitrile, polystyrene, polybutadiene, poly (meth) acrylic acid, polyvinyl chloride, poly vinylidene chloride, polyvinyl acetate, polyester, polyamide, polyether, and copolymers thereof. Among the copolymers, poly acrylic ester copolymer, styrene-acrylic ester copolymer, polyvinyl chloride-acetic copolymer, polyvinyl chloride-acrylic ester copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic ester copolymer, and SBR latex are preferably exemplified. 
   The printer  10  according to the present invention is not limited to those uses both the roll sheet and the cut sheet as described above, and only the roll sheet or only the cut sheet can be used. 
   In addition, if the roll sheet is used, the recording sheet S may be cut just after being pulled out from the recording sheet roll so that backprinting or image recording is performed on the cut sheet, instead of cutting the roll sheet into individual prints in the last stage. 
   The backprinting unit  14  performs backprinting on a back surface (or non image printing surface in the case of the recording sheet S having an ink receiving layer) of the recording sheet S by using such as a dot impact printer. Backprinting may also be performed by using an inkjet printer or a thermal printer. 
   There is no limitation on the content of the backprinting, and various types of information, which are standard in photographic printing, may be exemplified as the content of backprinting. 
   The image recording section  16  is a section for recording an image onto the long recording sheet S, or cut sheet type recording sheet S. The image recording section  16  includes, in the order from upstream side toward downstream side, a regulating guide  54 , a recording unit  56  for recording an image onto the recording sheet S, and a drying means  58  for drying the recording sheet S on which an image is recorded. A transport roller pair  50   c  is arranged upstream of the regulating guide  54 , a transport roller pair  50   d  is arranged between the regulating guide  54  and the recording unit  56 , and a transport roller pair  50   e  is arranged between the recording unit  56  and the drying means  58 , respectively. 
   The regulating guide  54  arranged upstream of the recording unit  56  (between the transport roller pair  50   c  and the transport roller pair  50   d ) regulates the recording sheet S with respect to positions in a direction (i.e., width direction) perpendicular to the transport direction of the recording sheet S fed to the recording unit  56  for recording an image by inkjet so that the recording sheet S is transported to a predetermined position. 
   The recording unit  56  arranged downstream of the regulating guide  54  (transport roller pair  50   d ) includes recording means  100  of known ink-jetting using an inkjet recording head (hereinafter referred to as the recording head), and a platen (rotatable platen, which will be described later in detail)  102  as supporting means for the recording sheet S, which faces the recording head. The recording unit  56  performs known image recording of a full color image by ink-jetting. 
   The method of image recording (drawing) performed by the recording means  100  may be any known method used in inkjet printers, without any particular limitation. 
   For example, a method of image recording based on so called FWA (Full Width Array) technology may be used in the recording means  100 , in which a line head having a nozzle array (an array of nozzles for ejecting ink droplets) which is longer than the maximum width of recording sheet S is used, and image recording is performed by ejecting ink droplets according to the width of the recording sheet S, from an array of nozzles which is equal or slightly longer than the width of the recording sheet S while sequentially transporting (scanning and transporting) the recording sheet S. 
   A method of image recording based on so-called PWA (Partial Width Array) technology may also be used in the recording means  100 , in which a small type of recording head is mounted on a carriage (scanning means) with its nozzle array aligned with the transport direction of the recording sheet S. The recording sheet S is intermittently transported, and while the transportation of the recording sheet S is stopped, image recording is performed by scanning the recording head in the width direction to allow an array of nozzles to eject ink droplets according to the width of the recording sheet S. 
   Accordingly, if the recording means  100  performs image recording based on FWA technology, the transport roller pairs  50   c - 50   e  (and  50   f  which will be described later) transport the recording sheet S in a sequential manner, and if the recording means  100  performs image recording based on PWA technology, the transport roller pairs  50   c - 50   e  (and  50   f  which will be described later) transport the recording sheet S in an intermittent manner. 
   The platen  102 , which will be described later in detail, is of a squire column in this example, and includes, on the surface of the column a plurality of (for example, three) recording medium support surfaces as the surfaces for transporting the recording sheet S, and an ink absorbing member surface for receiving ink pre-ejected (flushed) from the recording head. In each of the recording medium support surfaces, suction holes are provided so that lifting of the recording sheet S is prevented appropriately, for example, by sucking from inside, ensuring the recording sheet S to be regulated to a predetermined position, more reliably and accurately. 
   Moreover, each of the recording medium support surfaces of the platen  102  has an ink receiver of a groove shape for example, which is formed according to the width of applicable recording sheets S so as to prevent contamination with ink during so-called borderless printing in which image is recorded up to the edge of the print. This may be achieved by embedding an ink absorbing member in the groove of the groove shaped ink receiver, or by forming the ink receiver using an ink absorbing member. 
   The drying means  58  is arranged downstream of the recording unit  56  (that is, the platen  102  and the recording means  100 ). 
   The drying means  58  dries ink on the recording sheet S subjected to image recording by ink-jetting. There is no limitation on the drying means  58 , and any known means may be employed, such as, using a heater, or a fan, or using both heater and fan. 
   The transport roller pair  50   e , which is disposed between the platen  102  and the drying means  58 , is detachable, so that a space can be provided as necessary to prevent attachment of ink before being dried. 
   The recording sheet S that has been dried by the drying means  58 , is then transported to the surface treatment section  18  by the transport roller pairs  50   f  and  50   g . Between the transport roller pair  50   f  and the transport roller pair  50   g , a loop forming portion for the recording sheet is provided, which will also be described in detail later. 
   The surface treatment section  18  performs surface treatment on an ink receiving layer (thermal plastic resin), in the case where the inkjet recording sheet for photographic image quality printing having an ink receiving layer made of thermal plastic resin particles or ink-philic thermal plastic resin as described above, is used as the recording sheet S. 
   In the case where a recording sheet S other than those described above is used, surface treatment in the surface treatment section  18  is not necessary in general. Therefore, the recording sheet S is preferably transported toward downstream after no treatment is performed in the surface treatment section  18  by separating the nip roller  66  from the surface treatment belt  60 . 
   It should be understood that even if a recording sheet S other than the inkjet recording sheet for photographic image quality printing is used, the recording sheet S can be subjected to surface treatment as needed, as will be described later. 
   The surface treatment section  18  uses the surface treatment belt  60  to perform surface treatment on the recording sheet S, in such a manner that the surface (ink receiving layer) of the recording sheet S is brought into contact with the surface of the surface treatment belt  60 , and pressed/heated, and then cooled. 
   In the example shown in the drawing, the surface treatment section  18  includes in addition to the surface treatment belt  60 , a heating roller  62 , a roller  64 , the nip roller  66 , and a cooling section  68 . The surface treatment belt  60 , which is an endless belt, is stretched across the heating roller  62  and the roller  64 . 
   The surface treatment belt  60  has a surface (outer surface) having an extremely high smoothness. The heating roller  62  is a known heating roller that emits heat of a temperature applicable to heating treatment of the recording sheet S. The cooling section  68  cools the surface treatment belt  60  by abutting it from its inside, to allow the recording sheet S which is transported by the surface treatment belt  60  to be cooled. The nip roller  66  abuts and presses the surface treatment belt  60  at a position corresponding to the heating roller  62 , so as to press the recording sheet S against the surface treatment belt  60  and to nip and transport the recording sheet S along with the surface treatment belt  60 . 
   There is no limitation on the heating means in the heating roller  62 , as well as cooling means in the cooling section  68 , and any known means can be used. The nip roller  66  may also have heating means. 
   As apparent from  FIG. 1 , the recording sheet S on which an image has been recorded by ink-jetting is transported to the surface treatment section  18  with its image forming surface oriented toward the surface treatment belt  60 . 
   In the surface treatment section  18 , firstly, the recording sheet S is held and transported by the surface treatment belt  60  (heating roller  62 ) and the nip roller  66 . Then the recording sheet S is heated by the heating roller  62 , while the surface (ink receiving layer) of the recording sheet is abutted against the surface of the surface treatment belt  60 . 
   Through the heating/pressing, the recording sheet S becomes slightly adhesive to the surface treatment belt  60  due to melt of the ink receiving layer made of thermal plastic resin. The recording sheet S is transported by the surface treatment belt  60 , while slightly adhering thereto. During the transportation, in the surface treatment section  18 , the recording sheet S is cooled by the cooling section  68  to set the melted ink receiving layer. 
   The recording sheet S that has been cooled is separated from the surface treatment belt  60  at a fold back part of the roller  64  and then fed to the transport roller pair  50   h  in the downstream. 
   The ink receiving layer (thermal plastic resin) of the recording sheet S is thus pressed against the surface treatment belt  60  and heated/melted into an adhesive status. The ink receiving layer is then cooled/set so that the surface property of the surface treatment belt  60  is transferred to the ink receiving layer. As already described above, the surface treatment belt  60  has an extremely high surface smoothness. Therefore, the recording sheet S on which the surface property of the surface treatment belt  60  has been transferred will have a high surface smoothness and good glossiness, which allows production of a high quality print comparative to the silver halide photograph. 
   Moreover, the surface treatment of the recording sheet S allows not only imparting of glossiness, but also providing various other surface treatments such as matting (roughing), by selecting a desired surface property of the surface treatment belt  60 . 
   The printer  10  may have a feature for controlling the heating condition and/or cooling condition in the surface treatment section  18  so as to control the glossiness to be imparted to the surface of the recording sheet S (print). 
   Moreover, in the example shown in the drawings, stiffness inherent in the recording sheet S is utilized to separate the recording sheet S from the surface treatment belt  60 . Therefore, if reducing the diameter of the roller  64  that stretches the surface treatment belt  60  at a position where the recording sheet S is discharged from the surface treatment section  18  as shown in  FIG. 1 , the separation property in separating the recording sheet S from the surface treatment belt  60  can be improved. 
   The recording sheet S that has been subjected to surface treatment in the surface treatment section  18 , or has passed through the surface treatment section  18  is then transported to the cutting section  20  by the transport roller pair  50   h  and  50   i . Between the transport roller pair  50   h  and transport roller pair  50   i , a loop forming portion for the recording sheet is provided, which will also be described in detail later. 
   The cutting section  20  uses a cutter  42  of a known Guillotine cutter to cut, in the width direction, a long recording sheet S that has been supplied from the first loading section  30  or the second loading section  32 , recorded an image by ink-jetting in the image recording section  16 , and, if necessary, subjected to surface treatment in the surface treatment section  18 , so that individual prints are obtained (the recording sheet is cut into prints one by one). 
   It should be noted that the cutting section  20  of the printer  10  is not limited to cutting a long recording sheet S (rolled sheet). The cutting section  20  may be used, for example, in the case where a cut sheet type recording sheet S supplied from the cut sheet loading section  34  is used, to cut the leading/trailing edge (in the transport direction) of the cut sheet type recording sheet S in order to adjust the size for outputting, or to cut the leading/trailing edge of a so-called borderless print in which an image is recorded up to the edges. 
   While, in the printer  10  shown in the drawings, the cutting section  20  includes only the cutter  42  to cut the recording sheet S in the width direction, the present invention is not limited to this. 
   For example, if the recording unit  56  performs a so-called multi-imposition printing in the width direction, in which two or more images are recorded in the width direction, cutting means such as a slitter may be provided in the cutting section  20  to cut the recording sheet S in the transport direction. 
   As described above, each loop forming portion for forming a loop of the recording sheet S (a slack in the recording sheet S) is provided between the transport roller pair  50   f  and the transport roller pair  50   g , where the recording sheet S is transported from the image recording section  16  to the surface treatment section  18 , and between the transport roller pair  50   h  and the transport roller pair  50   i , where the recording sheet S is transported from the surface treatment section  18  to the cutting section  20 . 
   The surface treatment section  18  performs surface treatment by heating/melting the ink receiving layer of the recording sheet S and transporting/cooling the recording sheet S with the recording sheet S slightly adhering to the surface treatment belt  60 . 
   Therefore, in the surface treatment section  18 , if the transport of the recording sheet S is stopped, over-heating or over-cooling may occur to cause unevenness in the surface treatment, resulting in uneven glossiness. For this reason, the transport of the recording sheet S is not allowed to stop during the process in the surface treatment section  18 . 
   Also, if load fluctuation occurs during the treatment in the surface treatment section  18 , for example, in the event the recording sheet S is forcedly pushed into the surface treatment section  18 , or pulled from the surface treatment section  18 , the recording sheet S which is adhered to the surface treatment belt  60  can be out of sync with the belt, which also causes uneven glossiness. 
   However, if the recording means  100  performs image recording based on PWA technology, the recording sheet S is transported in an intermittent manner. Also, even if the recording means  100  performs image recording based on FWA technology, the transport speed (scan transport speed) corresponding to the image recording by the recording means  100  may be different from the transport speed corresponding to the surface treatment by the surface treatment section  18 . 
   On the other hand, since the cutting section  20  uses Guillotine cutter  42 , it is necessary to stop the transport of the recording sheet S, when cutting. 
   Accordingly, in the printer  10 , when a print is produced using a long recording sheet S (rolled sheet) supplied from the first loading section  30  or the second loading section  32 , the edge of the recording sheet S is stopped by the transport roller pair  50   g , without stopping the recording sheet S in the surface treatment section  18 . After a loop of the recording sheet S of a length sufficient to prevent any load fluctuation on the transport of the recording sheet S in the surface treatment section  18  is formed between the transport roller pairs  50   f  and  50   g , the transport by the roller pair  50   g  is started to transport the recording sheet S to the surface treatment section  18 . 
   Also, when a print is produced using a long recording sheet S, similarly to the above, the edge of the recording sheet S is stopped by the transport roller pair  50   i , without stopping the recording sheet S in the surface treatment section  18 . After a loop of the recording sheet S of a length sufficient to prevent any load fluctuation on the transport of the recording sheet S in the surface treatment section  18  is formed between the transport roller pairs  50   i  and  50   h , the transport by the roller pair  50   i  is started to transport the recording sheet S to the cutting section  20  (Guillotine cutter  42 ). 
   The transport speed of the transport roller pairs  50   g  and  50   h  is controlled to synchronize to the transport speed of the recording sheet in the surface treatment section  18  so as to prevent any load fluctuation on the transport of the recording sheet in the surface treatment section  18 . 
   The transport by the transport roller pairs  50   i  and  50   g  may be performed in an intermittent manner so as to correspond to the operation of the Guillotine cutter  42 . 
   The recording sheet S, i.e., the print, which has been cut by the cutting section  20  (Guillotine cutter  42 ) is discharged by the transport roller pairs  50   j  and  50   k  to the discharging section  22 . 
   The discharging section  22  uses an orthogonal transport belt (belt conveyor)  70  traveling in the depth direction in the document surface of  FIG. 1 , to sort the prints on an each order basis. The prints are discharged by the transport roller pair  50   k  onto the orthogonal transport belt  70  of the discharging section  22 , and stacked thereon. When the prints for one order are stacked, the stacked prints are transported by the orthogonal transport belt  70  by a distance corresponding to the size of one print (a length in the width direction) in the depth direction so that a portion of the belt on which no prints are stacked will be used as a discharge position from the transport roller pair  50   k . The orthogonal transport belt  70  repeats the stacking/transporting so that the prints are sorted on an each order basis. 
   Referring now to  FIGS. 2A ,  2 B,  3 A,  3 B,  4 A,  4 B,  5 A, and  5 A, in which examples of detailed configuration of the recording unit  56  which is a main part of the recording section  16  the printer  10  according to this embodiment, description will be given on the specific configuration of the recording means  100  based on known ink-jetting, and a rotatable platen  102  that supports the recording sheet S being transported in a direction shown by Arrow F. 
   In the examples shown below, as the recording means  100 , an image recording apparatus based on the above described FWA technology is used. However, it is shown as an example, and of course an image recording apparatus based on PWA technology may also be used. 
   As shown in  FIGS. 2B ,  3 B,  4 B, and  5 B, the recording unit  56  of the printer  10  according to the present invention, includes a recording head  100   a  that constitutes the recording means  100 , and a rotatable platen  102  that is arranged so as to face the recording head  100   a.    
   The recording head  100   a  is configured so as to allow ink to be ejected toward only a desired region in the recording sheet transport direction, through the control section  24  (in other words, ink ejection can be controlled so that only a desired region is printed as necessary). This configuration is effective when performing borderless printing onto recording sheets S being transported in parallel, allowing only desired regions of each recording sheet S to be printed efficiently. It is needless to say that, in borderless printing, the recording head  100   a  is controlled by the control section  24  to allow only nozzles corresponding to the width of the recording sheet to eject ink according to the width of the recording sheet, in the width direction of the recording sheet. 
   Next, the rotatable platen  102  will be described in detail by referring to  FIGS. 2A ,  2 B,  3 A,  3 B,  4 A,  4 B,  5 A, and  5 B. 
   As already described, the rotatable platen  102  basically includes a plurality of (three, in the drawings) recording medium support surfaces. In the examples shown, the rotatable platen  102  of a squire column includes in addition to the three recording medium support surfaces (A, B, C), one ink absorbing member surface (D) formed of an ink absorbing member for receiving ink ejected as pre-ejection operation of the recording head  100   a.    
   Examples of specific configuration shown in  FIGS. 2A ,  2 B,  3 A,  3 B,  4 A,  4 B,  5 A, and  5 B, illustrate each status in which each of the three recording medium support surfaces (A-C;  FIGS. 2A ,  2 B,  3 A,  3 B,  4 A, and  4 B), or the ink absorbing member surface (D;  FIGS. 5A and 5B ) of the rotatable platen  102  is positioned on the surface facing the recording head  100   a .  FIGS. 2A ,  3 A,  4 A, and  5 A are top views of the recording medium support surfaces or the ink absorbing member surface in that status, and the vicinity thereof.  FIGS. 2B ,  3 B,  4 B, and  5 B are views on Arrow Y-Y (showing only main parts) respectively corresponding to  FIGS. 2A ,  3 A,  4 A, and  5 A, as well as showing each positional relationship with respect to the recording head  100   a.    
   In the following description, the configuration of the recording medium support surfaces and ink absorbing member surface will be described, using a first recording medium support surface shown in  FIG. 2B  as an example. Hereinafter, a first recording medium support surface shown in  FIG. 2B  will be referred to as Surface A of the rotatable platen  102 . Similarly, second and third recording medium support surfaces shown in  FIGS. 3B and 4B  in detail, will be referred to as Surfaces B and C, respectively. The ink absorbing member surface shown in  FIG. 5B  will be referred to as Surface D. 
   As shown in  FIG. 2A , in Surface A of the rotatable platen  102 , there provided are ink receivers  104   a - 104   f  having patterns different from those on Surfaces B, C, which will be described later, as well as a plurality of suction holes  106  for sucking the recording sheet S, which are arranged without overlapping with the ink receivers  104   a - 104   f.    
   The ink receivers  104   a - 104   f  formed on Surface A of the rotatable platen  102  will be described, as to performing borderless printing by ink-jetting onto the recording sheet S in three different width sizes (P, Q, and R) using center alignment. The ink receivers  104   c ,  104   d  are provided as a first ink receiver pair corresponding to both edges of a recording sheet S having a width size of P. The ink receivers  104   b ,  104   e  are provided as a second ink receiver pair corresponding to both edges of a recording sheet S having a width size of Q. The ink receivers  104   a ,  104   f  are provided as a third ink receiver pair corresponding to both edges of a recording sheet S having a width size of R. 
   In the description, the rotatable platen  102  is configured in a squire pole having three recording medium support surfaces and one ink absorbing member surface. However, it should be noted that the number of surfaces on the circumference of the rotatable platen  102  is not limited to this, and the rotatable platen  102  may be of a regular polygonal column having any number of surfaces. 
   Inside the rotatable platen  102 , an air suction duct  110  is provided for sucking the recording sheet S through the suction holes  106  as shown in  FIGS. 6A and 6B . The air suction duct  110  is connected to air suction means  108 , such as a vacuum pump. The squire column rotatable portion  102   a  (rotatable portion of the rotatable platen  102 ) which has three recording medium support surfaces and one ink absorbing member surface is configured to be rotatable around the air suction duct  110 . Under the control of the control section  24 , the rotatable portion  102   a  rotates around the air suction duct  110  in order for a predetermined recording medium support surface or ink absorbing member surface to be aligned in a position facing the recording head  100   a.    
   In  FIGS. 6A and 6B , the air suction duct  110  has a slit  110   a . The slit  110   a  is arranged in a position facing the recording head  100   a  and made in contact with the inner surface of the ink absorbing member surfaces A-C that perform air suction (and also made in contact with the ink absorbing member surface D actually). 
   As shown in  FIGS. 2A ,  2 B,  3 A,  3 B,  4 A,  4 B,  5 A,  5 B,  6 A, and  6 B, a driving mechanism is provided for rotating the rotatable portion  102   a  of the rotatable platen  102 . The driving mechanism, in this embodiment, consists of, a driving means  112  including a bearing  114  for rotatably supporting a hollow rotation axis portion (of rotatable portion)  102   b , and gears  112   b ,  112   c  for connecting between the hollow rotation axis portion  102   b  and the shaft of the motor  112   a.    
   In this embodiment, in the rotatable portion  102   a  of the rotatable platen  102 , corner portions of the squire pole are cut, for example, as shown in  FIG. 2B , so that when the rotatable portion  102   a  rotates, its outer most circumference travels a rotation truck shown by a chain double-dashed line in the drawing, which prevents the rotatable portion  102   a  from abutting against the recording head  100   a , while reducing the distance between the recording head  100   a  and the rotatable platen  102  to a minimum distance. 
   Next, the second recording medium support surface (Surface B) shown in  FIG. 3B , and the third recording medium support surface (Surface C) shown in  FIG. 4B  will be described. 
   The second recording medium support surface (Surface B) shown in  FIG. 3B , and the third recording medium support surface (Surface C) shown in  FIG. 4B  are basically the same in configuration as the first recording medium support surface (Surface A) shown in  FIG. 2B  as described above, with a difference in positions where the ink receivers  104   g - 104   k ,  104   m - 104   r  are arranged. 
   Accordingly, the second recording medium support surface (Surface B) shown in  FIG. 3B  allows each recording sheet S to pass through each side of the ink receiver  104   i , so that a borderless image can be printed onto each recording sheet S by ink-jetting. In this case, each recording sheet S can be of two different width sizes (paper widths: P 1 , P 2  and Q 1 , Q 2  (corresponding ink receivers provided on opposite side:  104   j ,  104   k ,  104   h ,  104   g )). On the other hand, the third recording medium support surface (Surface C) shown in  FIG. 4B  allows each recording sheet S to pass through each side of the ink receiver  104   i , so that a borderless image can be printed onto each recording sheet S by ink-jetting. In this case, the recording sheet S to be passed through one side of the ink receiver  104   q  is of one width size P (corresponding ink receivers provided on opposite side:  104   r ) and the recording sheet S to be passed through the other side of the ink receiver  104   q  can be of three different width sizes Q (Q 1 , Q 2 , Q 3 , (corresponding ink receivers provided on opposite side:  104   p ,  104   n ,  104   m )). 
   Next, the ink absorbing member surface (Surface D) shown in  FIG. 5B  will be described. 
   The ink absorbing member surface (Surface D) having an ink receiver  104   s  formed of an ink absorbing member, across the full width in the width direction as shown in  FIG. 5A , is used for receiving the ink ejected during a so-called pre-ejection operation (flushing) which is performed prior to the start of the borderless image recording by ink-jetting, in which ink is ejected from an array of nozzles for removing any ink clogging in order to prevent the platen from being stained by ink. 
   Various known methods are available for controlling the rotatable portion  102   a  of the rotatable platen  102  having various functions as described above. For example, a photoelectric encoder is provided between the inner surface of the fixed part of the rotatable platen  102  and the side edge part of the rotatable portion  102   a , through which rotation amount is calculated, or a servomotor is used to drive the rotatable platen  102 . 
   The printer (inkjet printer)  10  according to this embodiment is basically configured as described heretofore. 
   Next, characteristic operations of the printer  10  will be described. 
   For instance, in order to perform borderless printing by ink-jetting onto recording sheets S (paper width sizes: P 2 , Q 2 ) that are transported in a two row transport pattern as shown in  FIGS. 3A and 3B , first after a certain period of blank, the control section  24  drives the driving means  112  to arrange the ink absorbing member surface (Surface D) of the rotatable platen  102  in a position (angle) facing the recording head  100   a.    
   The control section  24 , then allows the recording head  100   a  to perform pre-ejection operation (flushing) prior to the start of the image recording. In this case, all the ejected ink is absorbed by the ink absorbing member surface (Surface D) so that the platen surface is free from being stained by ink. 
   Upon completion of a predetermined pre-ejection operation, the control section  24  drives the driving means  112  to arrange the second recording medium support surface (Surface B) of the rotatable platen  102  in a position (angle) facing the recording head  100   a , in replace of the ink absorbing member surface (Surface D) of the rotatable platen  102 . 
   In this status, the control section  24  then starts transportation of the recording sheets S in a two-row transport pattern, and at almost the same time, starts borderless printing with the recording head  100   a.    
   In this embodiment, since the ink receivers  104   k ,  104   i ,  104   g  are arranged in positions corresponding to the width sizes (P 2 , Q 2 ) of the recording sheets S, borderless printing can favorably be performed onto the recording sheets. 
   In other words, after a leading edge of a rolled recording sheet S reaches the rotatable platen  102  (recording head  100   a ), the ink absorbing member surface (Surface D) of the rotatable platen  102  becomes unnecessary, and then the recording medium support surface (Surface B) of the rotatable platen  102  is arranged in a position facing the recording head  100   a  so that owing to ink absorbing action to be provided by the ink receivers  104   g - 104   k  that are arranged outside of the both edges of each recording sheet S, ink stain is prevented and borderless printing can be performed favorably. 
   Then, printing is performed continuously. When a trailing edge of the recording sheet S reaches a point close to the rotatable platen  102  (recording head  100   a ), the control section  24  uses an end of printing as a timing to drive the driving means  112  to rotate the rotatable platen  102  to arrange, in replace of the recording medium support surface (Surface B), the ink absorbing member surface (Surface D) of the rotatable platen  102  in a position (angle) facing the recording head  100   a . This eliminates possibility of staining the platen with ink, even if, due to some reason, ink is ejected from the recording head  100   a  toward the platen where the trailing edge of the recording sheet S has already passed through. 
   Next, in order to perform borderless printing by ink-jetting onto recording sheets S that are transported in a transport pattern different from that used in the above described case, the control section  24  allows the recording head  100   a  to perform, prior to the start of the image recording, pre-ejection operation (flushing) with the ink absorbing member surface (Surface D) of the rotatable platen  102  being arranged in a position (angle) facing the recording head  100   a . It should be noted that such pre-ejection operation (flushing) can be omitted depending on the time elapsed from the last printing. 
   Upon completion of a predetermined pre-ejection operation, the control section  24  drives the driving means  112  to arrange the first recording medium support surface (Surface A) of the rotatable platen  102  corresponding to a new transport pattern (in the description, a case shown in  FIGS. 2A and 2B  in which borderless recording is performed using center alignment by ink-jetting on recording sheets S having three different width sizes (P, Q, and R) is exemplified) in a position (angle) facing the recording head  100   a.    
   The control section  24  in this status then starts the transportation of a recording sheet S having a predetermined width size (for example, Q out of the above P, Q, and R), and almost at the same time, starts borderless printing with the recording head  100   a.    
   Subsequent operations are the same as the case described above. 
   As described heretofore, in the above embodiment, borderless printing can be performed onto recording sheets S, in which each recording sheet S is transported in a different transport mode, by selecting, under the control of the control section  24 , a recording medium support surface suitable for each transport pattern, and rotating the rotatable platen  102  so that the selected recording medium support surface is stopped in a position facing the recording head  100   a . In addition, under the control of the control section  24 , the rotatable platen  102  is rotated to allow the ink absorbing member surface (D) to stop at a position facing the recording head  100   a , according to various driving conditions of the recording head  100   a , for example, if this operation first after the apparatus is powered on or not, if this operation first after any maintenance or not, how many hours have elapsed after the last operation, and the like. Accordingly, pre-ejection operation can easily be performed, and a recording medium support surface of the rotatable platen  102  suitable for a desired transporting pattern as described above can be selected, and therefore image recording for preparing a borderless print can easily be performed. 
   According to the embodiment, an image recording apparatus with a platen capable of switching ink receiver arrangements is achieved, that may suitably be used for borderless printing by ink-jetting, and that enables one single apparatus to perform image recording onto a plurality of different width size recording media, or allows multiple rows of recording medium to be transported in parallel for performing image recording (drawing) or post treatment subsequent to the image recording. 
   It should be noted that, if the image recording is performed based on PWA technology, there are following effects in addition to the above. 
   That is, when changing the recording medium support surface of the rotatable platen  102 , the carriage on which the recording head is mounted can be retracted, in a transport direction of the recording sheet S, from the rotatable portion  102   a  of the rotatable platen  102 . This allows the recording medium support surface to be changed without interfering with the recording head, which in turn leads to a possibility of reduction in distance between the recording head and the recording medium. 
   The image recording apparatus of the present invention has been described heretofore in detail. However, the prevent invention is not limited to the embodiments described above and it is of course possible to make various modifications and changes without departing from the gist of the present invention.