Patent Publication Number: US-8529051-B2

Title: Paper seasoning apparatus and inkjet recording apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority under 35 USC 119 from Japanese Patent Application No. 2010-147953, filed on Jun. 29, 2010 the disclosure of which is incorporated by reference herein. 
     BACKGROUND 
     1. Technical Field 
     The present invention relates to a paper seasoning apparatus and an inkjet recording apparatus. Particularly, the present invention relates to a paper seasoning apparatus for blowing air onto a side face of a stack of paper, and an inkjet recording apparatus including the paper seasoning apparatus. 
     2. Related Art 
     Papers that have been recorded with image by an image recording apparatus, such as inkjet recording apparatus, are configured into paper stacks. Such paper stacks are configured with, for example, separation plates inserted between sheets of paper to separate the paper every specific number of sheets. For example, Japanese Patent Application Laid-Open (JP-A) No. 6-239514 discloses an automatic blanking device in which a sensor detects when the number of sheets of paper stacked on a blanking plate has reached a specific number, and the blanking plate is then lowered by a fixed amount. 
     Sometimes expansion and contraction of paper occurs just after the paper has been recorded with an image by an inkjet recording apparatus. This expansion and contraction of paper are due to the presence of portions within a single sheet of paper, where there is a lot of ink (moisture content) and portions where there is little thereof. Consequently, humidity conditioning (called seasoning) of the paper is preferably performed by supplying air onto the plural sheets of paper (paper stack). However, if this results in the need for an operation to carry the paper stacks from an inkjet recording apparatus to a paper seasoning apparatus then this increases the workload on an operative. 
     SUMMARY 
     The present invention provides a paper seasoning apparatus and an inkjet recording apparatus including the paper seasoning apparatus, capable of both separating paper into paper stacks by introducing separation plates between sheets of the paper, and seasoning the paper configured in the paper stacks. 
     A first aspect of the present invention is a paper seasoning apparatus including: a paper housing section that stacks and houses sheets of paper that have been recorded with an image; a separation plate introduction section that introduces separation plates into the paper housing section for separating stacked paper into paper stacks; a separation plate support section that supports a plurality of the separation plates, and provides intervals between the separation plates greater than the stacked height of the paper stack; and an air blowing section that blows air onto a side face of the paper stacks separated by the separation plates in the paper housing section. 
     Such a paper seasoning apparatus stacks and houses sheets of paper that have been recorded with images in the paper housing section. In order to configure paper stacks, separation plates are then introduced by the separation plate introduction section for separating the sheets of paper into paper stacks with the separation plates. Plural separation plates are supported by a separation plate support section and the interval between the separation plates is made greater than the stacked height of the paper stacks. Seasoning can be efficiently performed to the paper by blowing air with the air blowing section onto the side face of the paper stacks while in this state. Namely, such a paper seasoning apparatus enables both the separation plates to be introduced between sheets of paper to configure paper stacks and also seasoning to be performed to the paper configured in paper stacks. 
     A second aspect of the present invention, in the first aspect, the separation plate support section may lower the separation plate by a lowering amount that matches the increase in height of the stack height of the paper stack. 
     Accordingly, by lowering the separation plates by an amount that matches the increase in stack height of the paper stacks, the paper may be smoothly housed in the paper housing section without the paper colliding with the side face of the already housed paper stack. 
     A third aspect of the present invention, in the second aspect, the air blowing section may blow air onto the side face of the paper stack while the paper stack is being lowered. 
     Accordingly, efficient seasoning may be possible by performing seasoning while the paper stacks are being lowered. 
     A fourth aspect of the present invention, in either the second or the third aspect, the separation plates may be configured by a bottom separation plate on which the paper stack is stacked, and a top separation plate disposed above the bottom separation plate, and the bottom separation plate and the top separation plate may be lowered such that the interval between the bottom separation plate and the top separation plate is provided greater than the stack height of the stacked paper. 
     Consequently, each of the paper stacks can be surrounded below and above by a bottom separation plate and a top separation plate, enabling seasoning to be performed while also suppressing the paper from thrashing around. The interval between the bottom separation plate and the top separation plate is set larger than the stack height of the stacked stack, and hence the separation between sheets of paper can be opened wider, ensuring that air can be blown through between the sheets of paper (passing air through). 
     A fifth aspect of the present invention, in the fourth aspect, the separation plate support section may support and lower the bottom separation plate and the top separation plate, and at a specific lowering position, support of the top separation plate may be released before support of the bottom separation plate is released. 
     The above release of support for the top separation plate is, for example, implemented at the point in time when air blowing by the air blowing section has been completed. The top separation plate approaches the bottom separation plate under its own weight due to release of support to the top separation plate, and the interval between the bottom separation plate and the top separation plate can be narrowed. 
     A sixth aspect of the present invention, in the fifth aspect, leg portions may be provided at the top separation plate for supporting the top separation plate on the bottom separation plate when support of the top separation plate from the separation plate support section has been released. 
     Consequently, even though support of the top separation plate by the separation plate support section has been released, the leg portions provided to the top separation plate make contact with the bottom separation plate and the top separation plate is thereby supported. A specific interval can thereby be configured between the bottom separation plate and the top separation plate. 
     A seventh aspect of the present invention, in the sixth aspect, the leg portions may be positioned at the outside of a side face of the paper stack and suppress the paper from thrashing about when air is blown from the air blowing section. 
     Due to the leg portions suppressing the paper from thrashing around, even more efficient seasoning may be performed while also suppressing deformation of the paper. 
     An eighth aspect of the present invention, in the first to the seventh aspects, the separation plates may be formed with a curve so as to protrude upwards when viewed from the air blowing section along the direction of air blow. 
     Accordingly, air is blown by the air blowing section onto the side face of the paper stack in a direction orthogonal to the curved direction of the bottom separation plate. Hence even if the paper has a curl initially, air can be passed between the sheets of paper and humidity conditioning achieved while the curl is being corrected. 
     A ninth aspect of the present invention, in the first to the eighth aspects, may further include, a cover member that surrounds the separation plate support section on four sides, wherein the cover member may be formed with an air blowing opening for introducing air blown from the air blowing section, and with an air discharge outlet for discharging air from inside the cover member. 
     By surrounding the separation plate support section by the cover member on four sides in this manner, the paper on the separation plate supported by the separation plate support section is not readily externally affected during air blowing by the air blowing section. The cover member is formed with the air blowing openings and the air discharge outlets and hence the cover member can be suppressed from impeding air blowing from the air blowing section (seasoning). 
     A tenth aspect of the present invention is an inkjet recording apparatus including: an inkjet recording apparatus main body that ejects ink droplets onto paper and records images; and the paper seasoning apparatus of the first aspect, provided at a discharge section for paper that has been recorded with images by the inkjet recording apparatus main body. 
     An image can be recorded on the paper with the inkjet recording apparatus main body. By then providing the paper seasoning apparatus of one of the first to the ninth aspects, paper stacks can be configured by introducing the separation plates between the sheets of paper, and also paper seasoning can be performed to the paper stacks configured by the paper. In addition the paper seasoning apparatus is provided at the discharge section of the inkjet recording apparatus main body, and so there is no requirement for an operation to carry the paper stacks from the inkjet recording apparatus main body to the paper seasoning apparatus. 
     According to the above aspects, the present invention may provide a paper seasoning apparatus and an inkjet recording apparatus including the paper seasoning apparatus, capable of both separating paper into paper stacks by introducing separation plates between sheets of the paper, and seasoning the paper configured in the paper stacks. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       An exemplary embodiment of the present invention will be described in detail based on the following figures, wherein: 
         FIG. 1A  is a front view illustrating an overall configuration of a paper seasoning apparatus of a first exemplary embodiment of the present invention; 
         FIG. 1B  is a partial enlargement of a paper seasoning apparatus of the first exemplary embodiment of the present invention; 
         FIG. 2  is a perspective view illustrating a housing and the interior of a paper seasoning apparatus of the first exemplary embodiment of the present invention; 
         FIG. 3A  to  FIG. 3D  are explanatory diagrams showing processing sequences for seasoning paper in a paper seasoning apparatus of the first exemplary embodiment of the present invention; and 
         FIG. 4  is a front view illustrating an outline configuration of an inkjet recording apparatus including a paper seasoning apparatus of the first exemplary embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     Explanation follows regarding a paper seasoning apparatus  12  of a first exemplary embodiment of the present invention, and an inkjet recording apparatus  112  including the paper seasoning apparatus  12 . 
     As shown in  FIG. 1A  and  FIG. 1B , the paper seasoning apparatus  12  of the present exemplary embodiment includes a box shaped housing  14  that is open to the top and bottom, and a plate feeding apparatus  16  disposed adjacent to the housing  14 . Bottom separation plates  18 B and top separation plates  18 A, which together configure separation plates  18  of the present invention, are disposed between plural sheets of paper  154  inside the housing  14 . Namely, plural sheets of the paper  154  are separated by the bottom separation plates  18 B and the top separation plates  18 A into paper stacks  152  that are each configured from a specific number of sheets (for example 100 sheets) of the paper  154 . Accordingly, in each of the paper stacks  152 , the specific number of sheets of paper  154  are supported in a stacked state configuring a paper stack  152  on a bottom separation plate  18 B, with a top separation plate  18 A also disposed above the paper stack  152 . Namely, the paper stack  152  is housed in a paper housing space  20  configured between the bottom separation plate  18 B and the top separation plate  18 A. Hereinafter, one of the paper stacks  152  together with its bottom separation plate  18 B below and top separation plate  18 A above, will be referred to below as a paper stack unit  156 . 
     As shown in  FIG. 3A  and  FIG. 3D , when viewed from the arrow A 1  direction (the same direction as the air blowing direction from air blowing devices  56 , described later), each of the bottom separation plates  18 B has a shape with a raised width direction central portion and lowered at both width direction edge portions. In other words, each of the bottom separation plates  18 B has an upwards facing convex shape. Curving the bottom separation plate  18 B in this shape enables, for example, curl correction to be performed by bending the paper in a direction orthogonal to a curl direction, when the paper  154  that has been recorded with an image in the inkjet recording apparatus  112  adopted a curl in a particular direction. The radius of curvature of the top face of the bottom separation plate  18 B is not necessarily be constant across the width direction (the arrow W 1  direction), and there may be a different radius of curvature at each location on the bottom separation plate  18 B. 
     Spacers  22  are formed, as examples of the leg portions of the present invention, protruding downwards from the bottom face of each of the top separation plates  18 A near to the four corners. The spacers  22  are formed with a specific height H 2 , and act to ensure a specific separation (the vertical separation D 1 ) to house the paper stack  152  between the top face of the bottom separation plate  18 B and the bottom face of the top separation plate  18 A. The top separation plates  18 A are also configured with a similar curve to that of the bottom separation plates  18 B, such that the vertical separation D 1  is substantially constant across the width direction (arrow W 1  direction). 
     As shown in detail in  FIG. 2 , the housing  14  is formed from a front plate  24 , a rear plate  26  and two side plates  28 , serving as cover members of the present invention, in a frame shape as viewed from above. The housing  14  to provide a paper housing section  30  inside the frame. Sheets of the paper  154  that have been recorded with images by the inkjet recording apparatus  112  are housed in the paper housing section  30  in a stacked state. The rear plate  26  and the side plates  28  of the housing  14  have the same height as each other. However the height of the upper portion of the front plate  24  is lower than that of the rear plate  26  and the side plates  28 , so as to configure a plate insertion indented portion  32 . 
     The bottom face of housing  14  is open. A pallet support table  34  is disposed below the housing  14 , as shown in  FIG. 1A , and a pallet  38  with castors  36  is supported on the pallet support table  34 . The paper stack units  156  are mounted on the pallet  38  when they have completed seasoning, described later. 
     The plate feeding apparatus  16  includes a separation plate support table  40 . Plural separation plates  18  are stacked on the separation plate support table  40 , alternating the bottom separation plates  18 B and the top separation plates  18 A. The separation plate support table  40  is raised or lowered to a height, such that the uppermost two of the separation plates  18  (a bottom separation plate  18 B and a top separation plate  18 A) are aligned with the plate insertion indented portion  32  of the housing  14 . The uppermost two of the separation plates  18  are then each pushed in the arrow A 1  direction by insertion rods  42 A,  42 B, such that the separation plates  18  are inserted into the housing  14  through the plate insertion indented portion  32 . Note that the plate feeding apparatus  16  also includes guide members (not shown in the drawings) to prevent the separation plates  18  from unintentionally tipping or falling out, and to smoothly introduce the separation plates  18  into the housing  14 . 
     As shown in detail in  FIG. 2 , a separation plate lowering device  44  is provided at the inside faces of each of the respective two side plates  28  of the housing  14 . The separation plate lowering device  44  serves as a separation plate support section of the present invention. Namely, the separation plate lowering device  44  is surrounded in four directions by the front plate  24 , the rear plate  26  and the two side plates  28 . 
     The separation plate lowering device  44  has a pair of bottom separation plate lowering belts  46 B disposed at the inside of each of the side plates  28  (a total of four of the bottom separation plate lowering belts  46 B). The bottom separation plate lowering belts  46 B are endless shaped belts entrained around upper drive pulleys  48  and lower following pulleys  50 . Support fingers  52 B for supporting the bottom separation plates  18 B project out at fixed vertical intervals from the bottom separation plate lowering belts  46 B. The support fingers  52 B are capable of supporting the bottom separation plates  18 B so as to be positioned in the vicinity of the corner portions of the bottom separation plate  18 B introduced into the housing  14 . 
     The separation plate lowering device  44  has a pair of top separation plate lowering belts  46 A disposed at each of the side plates  28  (a total of four of the top separation plate lowering belts  46 A). The top separation plate lowering belts  46 A are endless shaped belts entrained around upper drive pulleys  48  and lower following pulleys  50 . Support fingers  52 A for supporting the top separation plates  18 A project out at fixed vertical intervals from the top separation plate lowering belts  46 A. The support fingers  52 A are positioned in the vicinity of the corner portions of the top separation plate  18 A introduced into the housing  14  and can support the top separation plates  18 A. 
     The relative position of the support fingers  52 B,  52 A is set to give a vertical separation D 2  between the bottom separation plates  18 B and the top separation plates  18 A. The vertical separation D 2  is wider than the height H 2  between the spacers  22  when the bottom separation plates  18 B and the top separation plates  18 A are in a supported state by the support fingers  52 B and the support fingers  52 A, respectively (the bottom ends of the spacers  22  are hence separated from the bottom separation plates  18 B). The fixed vertical separation D 2 , wider than the height H 2  of the spacers  22 , configured between the top faces of the bottom separation plates  18 B and the bottom faces of the top separation plates  18 A in the state in which the bottom separation plates  18 B and the top separation plates  18 A, are supported by the support fingers  52 B,  52 A, respectively. This state is then maintained while the bottom separation plates  18 B and the top separation plates  18 A are lowered. 
     The drive pulleys  48  are coupled together by dive shafts  55 , so as to be rotated as one in the arrow R 1  direction by drive motors  54 . The bottom separation plates  18 B and the top separation plates  18 A are maintained with the above specific vertical separation D 2  while they are being lowered at a constant lowering speed by rotation driving the drive pulleys  48 . The lowering amount here (lowering speed) is set to match the increase in height of the paper  154 , as the sheets of the paper  154  are successively housed in the paper housing section  30 . Namely, a lowering amount of the height of one sheet of the paper  154  is made during the period (time separation) from feeding in one sheet of the paper  154  to feeding in the next sheet of the paper  154 . 
     The following pulleys  50  of the top separation plate lowering belts  46 A are set higher than the following pulleys  50  of the bottom separation plate lowering belts  46 B. Accordingly, when the bottom separation plates  18 B and the top separation plates  18 A are being lowered while maintaining the above vertical separation D 2 , the support fingers  52 A first reach the following pulleys  50  and from then onwards separate from the respective top separation plate  18 A, releasing support of the top separation plate  18 A. The top separation plate  18 A is consequently lowered under their own weight, until the bottom ends of the spacers  22  make contact with the top face of the respective bottom separation plate  18 B. The bottom separation plate  18 B and the top separation plate  18 A thereby adopt a vertical separation H 1  that is substantially equivalent to that of the height H 2  of the spacers  22  (see  FIG. 1B ). Then, when the support fingers  52 B reach the following pulleys  50  the support fingers  52 B from then onwards separated from the bottom separation plates  18 B, releasing the support of the bottom separation plate  18 B. The paper stack units  156  are accordingly mounted onto the pallet  38  (namely mounted above a paper stack unit  156  when there is already a paper stack unit  156  mounted on the pallet  38 ). 
     As shown in  FIG. 1A  and  FIG. 1B , plural air blowing devices  56  are disposed at the housing  14  in positions further outside than the front plate  24 . Air blowing openings  24 H are formed in the front plate  24  for introducing air blown from the air blowing devices  56  into the housing  14 . Air discharge outlets  26 H are also formed in the rear plate  26  for externally discharging air. As an example of the air blowing openings  24 H in the present exemplary embodiment, there are about 5 to 7 rows of air blowing openings  24 H formed along the horizontal direction, and the vertical direction is disposed with 3 rows of the air blowing devices  56 . The air discharge outlets  26 H are, for example, formed by dividing into many slits on progression along the width direction, positioned so as to substantially align with the air blowing openings  24 H. 
     The air blowing openings  24 H may be formed to correspond to individual air blowing devices  56 . However, the air blowing openings  24 H of the present exemplary embodiment are configured with elongated shapes along the horizontal direction, divided for each of the air blowing devices  56  along the height direction but common to all of the air blowing devices  56  along a given horizontal direction (resulting in 3 rows of the air blowing openings  24 H being formed along the height direction). The air discharge outlets  26 H are divided for each of the air blowing devices  56  along the height direction. Forming the air blowing openings  24 H and the air discharge outlets  26 H in this manner, enables air similar to that of in the peripheral atmosphere (similar temperature and humidity) to be blown from the air blowing devices  56  against a side face of the paper stacks  152 , as the separation plates  18  (the paper stack units  156 ) are being lowered by the separation plate lowering device  44 . This provides an action that acclimatizes (seasons) the paper configuring the paper stacks  152  to the peripheral environment. 
       FIG. 4  illustrates the inkjet recording apparatus  112  as an example of an application of the paper seasoning apparatus  12  of the present invention. The inkjet recording apparatus  112  includes a paper feeder  114 , a processing liquid coating section  116 , an image recording section  118 , a drying section  120 , a fixing section  122  and a paper discharge section  124 . The inkjet recording apparatus  112  records an image on the paper  154  as the paper  154  is being conveyed along sequentially to the position of each of the above. 
     The paper  154  is stacked in the paper feeder  114  and the paper feeder  114  feeds out the paper  154  one sheet at a time. The paper  154  that has been fed out is conveyed via a paper feed tray  125  and a paper feed drum  126  to the processing liquid coating section  116 . A processing liquid coating drum  128  is rotatably disposed in the processing liquid coating section  116 . The paper  154  is conveyed downstream by rotation of the processing liquid coating drum  128 , with the leading edge of the paper  154  in a retained state by a retaining member  130 . Processing liquid is coated onto the paper  154  by a processing liquid coating device  132  disposed above the processing liquid coating drum  128 . Configuration may, as required, include a processing liquid drying apparatus to actively dry the processing liquid. The processing liquid reacts with ink, thereby acting to aggregate coloring matter (pigment) and promote separation of coloring matter (pigment) from the liquid medium. 
     The paper  154  is then fed via a conveying drum  134  to the image recording section  118 . In the image recording section  118 , the paper  154  is conveyed while retained on an image recording drum  136 , and an image is recorded on a face of the paper  154  by impacting ink droplets ejected from an inkjet recording head  138  disposed above the image recording drum  136 . More precisely, there are four colors of inkjet recording heads  138  in the present exemplary embodiment, for the basic colors of yellow (Y), magenta (M), cyan (C) and black (K), disposed along the circumferential direction of the image recording drum  136 . Each of the inkjet recording heads  138  has an ink jetting range corresponding to the maximum width of the paper  154 , namely they are full-line heads. 
     The paper  154  is then conveyed via a conveying drum  140  to the drying section  120 . The paper  154  is conveyed in the drying section  120  while retained on a drying drum  142 . Halogen heaters  144  and warm air nozzle  146  are disposed above the drying drum  142 . The ink on the paper  154  is dried by heat from the halogen heaters  144  and warm air from the warm air nozzles  146  as being conveyed by the drying drum  142 . 
     The paper  154  is then fed via a conveying drum  148  to a fixing section  122 . In the fixing section  122 , the image (ink) is fixed by being heated by a halogen heater  162  (preparatory heating) and pressed by a fixing roller  164 , as the paper  154  is being conveyed while retained on a fixing drum  150 . A check pattern on the paper  154  and the moisture content, surface temperature and glossiness are then measured by an in-line sensor  166 . 
     The paper  154  that has been recorded with an image in the manner described above is then conveyed by a discharge roller  168 , and is discharged from the inkjet recording apparatus  112  via the paper discharge section  124 . The paper seasoning apparatus  12  is provided at the paper discharge section  124 , and the image recorded paper is then seasoned in the paper seasoning apparatus  12 . 
     Configuration is made such that the paper  154  is fed one sheet at a time into the paper housing space  20  of the paper seasoning apparatus  12 , with the paper stack  152  formed by stacking the plural sheets of the paper  154  when they are in the paper housing space  20 . 
     Explanation now follows regarding a method of seasoning the paper  154  by blowing air at a side face of the paper stack  152  using the paper seasoning apparatus  12  of the present exemplary embodiment, and regarding operation of the paper seasoning apparatus  12 . 
     In the paper seasoning apparatus  12 , in order to separate the paper  154  into specific numbers of sheets with the separation plates  18  (the bottom separation plates  18 B and the top separation plates  18 A), first a sufficient number of the bottom separation plates  18 B and the top separation plates  18 A are stacked alternately on the separation plate support table  40 . 
     Then prior to housing the sheets of the paper  154  that have completed image recording in the paper housing section  30 , as shown in  FIG. 3A , one of the bottom separation plates  18 B is set in the housing  14 . The drive motors  54  are then driven, circulating the bottom separation plate lowering belts  46 B and the top separation plate lowering belts  46 A, and moving the support fingers  52 B,  52 A downwards. When the bottom separation plate  18 B is supported on the support fingers  52 B, the bottom separation plate  18 B is lowered at a lowing speed of the height of a single sheet of the paper  154  during the cycle (time separation) for feeding in successive sheets of the paper  154 . 
     In this state, as shown in  FIG. 3B , the sheets of the paper  154  that have been recorded with images by the inkjet recording apparatus  112  are fed successively into the paper housing section  30  and stacked. An operative does not need to carry the image recording completed paper to the paper seasoning apparatus  12  due to provision of the paper seasoning apparatus  12  at the paper discharge section  124  in the inkjet recording apparatus  112 . 
     Furthermore, due to the bottom separation plate  18 B being lowered at the specific lowering speed, the sheets of the paper  154  newly fed in do not unintentionally collide with the side face of the sheets of the paper  154  that have already been stacked on the bottom separation plate  18 B, and the sheets of the paper  154  can be smoothly housed in the paper housing section  30 . 
     When the number of the sheets of the paper  154  reaches a specific number for configuring one of the paper stacks  152 , the insertion rods  42 A,  42 B of the plate feeding apparatus  16  are driven. Then, as shown in  FIG. 3C , the top separation plate  18 A and the bottom separation plate  18 B are inserted into the paper housing section  30 . The top separation plate  18 A and bottom separation plate  18 B are supported by the support fingers  52 A and the support fingers  52 B, respectively. The top separation plate  18 A is accordingly positioned above the paper stack  152 , and the paper stack unit  156  is configured with the paper stack  152  in a housed state between the bottom separation plate  18 B and the top separation plate  18 A in the paper housing space  20 . 
     The vertical separation D 2  between the top separation plate  18 A and the bottom separation plate  18 B above and below the paper stack  152  is set wider than the stack height H 1  of the paper stack  152  when in its natural state (see  FIG. 1B ). The paper stack unit  156  is lowered while this state is maintained, and air from the air blowing devices  56  is blown against the side face of the paper stack  152 . As shown in  FIG. 1A ,  FIG. 1B  and  FIG. 3D , the air is caused to pass between the sheets of the paper  154 , and the paper  154  can be acclimatized to the peripheral environment (seasoned). More specifically, seasoning in the present exemplary embodiment is performed while the paper stack  152  is being lowered. Namely, continuous seasoning may be performed in turn to plural successive paper stacks  152 . 
     Furthermore, due to the top separation plate  18 A facing the top of the paper stack  152 , seasoning may be performed while suppressing the paper  154  from thrashing around unintentionally. However, since the spacers  22  of the top separation plate  18 A are disposed at the side of the paper stack  152 , movement in the horizontal direction and thrashing about of the sheets of the paper  154  may also be suppressed. Accordingly, this enables seasoning to be performed more efficiently than is the case in configurations not provided with the spacers  22 . Deformation of the paper  154  caused by such movement and thrashing about may also be suppressed. 
     The paper  154  that has been image recorded by the inkjet recording apparatus  112  is then similarly fed in onto the next bottom separation plate  18 B, as shown in  FIG. 3D . This is followed by repetition of the above operations, with the paper  154  being seasoned by air blown form the air blowing device  56  as the paper stack unit  156  is being lowered. 
     When the paper stack unit  156  is lowered further and the support fingers  52 A reach the position of the following pulleys  50 , support of the top separation plate  18 A from the support fingers  52 A is released. As can be seen from  FIG. 1A  and  FIG. 1B , the top separation plate  18 A is then lowered under its own weight, and the bottom ends of the spacers  22  make contact with the top face of the bottom separation plate  18 B. At this stage the support fingers  52 B support the paper stack unit  156 . 
     When the paper stack unit  156  is lowered still further to a specific position, namely the position where the support fingers  52 B reach the following pulleys  50 , due to support of the paper stack unit  156  from the support fingers  52 B being released, the paper stack unit  156  is then placed on the pallet  38 . When a specific number of the paper stack units  156  have been mounted on the pallet  38 , the pallet  38  supporting the paper stack units  156  and the pallet support table  34  are moved as a single unit, the pallet and the paper stack units  156  are removed from the pallet support table  34 , and a new pallet  38  is set on the pallet support table  34 . 
     Accordingly, the paper seasoning apparatus  12  of the present exemplary embodiment configures a portion of the inkjet recording apparatus  112 . Further, in the present exemplary embodiment, the paper  154  is discharged from the paper discharge section  124  of the inkjet recording apparatus  112  is fed into the paper housing section  30  without being carried by an operative. Accordingly, present exemplary embodiment enables both seasoning and separation to be performed by the separation plates  18 . More specifically, when the sheets of the paper  154  are fed in, lowering the bottom separation plate  18 B at a specific lowering speed enables newly fed sheets of the paper  154  not to impinge on the paper  154  already supported on the bottom separation plate  18 B, and the paper stacks  152  may be smoothly made. 
     However, in the paper seasoning apparatus  12  of the present exemplary embodiment, due to employing the top separation plates  18 A in addition to the bottom separation plates  18 B as the separation plates  18 , the paper stack  152  can be housed in the paper housing space  20  during paper seasoning. Consequently, the air flow blown from the air blowing devices  56  may be made to better impact the side face of the paper stack  152  without being wasted and more efficient seasoning may be performed than would be the case were the paper housing space  20  to be configured without the top separation plate  18 A. More specifically, in the present exemplary embodiment, the vertical separation D 2  between the bottom separation plates  18 B and the top separation plates  18 A is set higher than the stack height H 1  of the paper stack  152  in its natural state, permitting the spacing between the sheets of the paper  154  being blown by the air from the air blowing device  56  to open out wider, enabling sufficient volume of air to be blown between the sheets of the paper  154  and achieving even more efficient seasoning. 
     In the paper seasoning apparatus  12  of the present invention, since the top face of the bottom separation plate  18 B, mounted with the paper stack  152 , is also curved so as to protrude upwards, this also enables the shape of the paper to be corrected such that the paper  154  is made to be parallel to the direction of air blowing even when the paper  154  has a curl initially.