Patent Publication Number: US-9884735-B2

Title: Sheet tray and sheet conveying apparatus

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     The present application claims priority from Japanese Patent Application No. 2016-016561 filed on Jan. 29, 2016 the disclosure of which is incorporated herein by reference in its entirety. 
     BACKGROUND 
     Field of the Invention 
     The present invention relates to a sheet tray configured to support a sheet, and a sheet conveying apparatus provided with a sheet tray configured to support a sheet to be fed to a main body of the sheet conveying apparatus. 
     Description of the Related Art 
     There is known a sheet tray having a configuration in which a three or more staged-tray including three or more trays is expanded and contracted. For example, there is known a feed tray capable of enlarging a supporting surface for supporting a sheet thereon by drawing (pulling out) a four-staged tray. This feed tray is provided with a lock mechanism for locking the trays at the respective stages so as to prevent a such a situation that a drawn state, wherein the tray(s) is (are) drawn, cannot be maintained due to natural falling of a tray which is arranged at an immediately above the stage of each of the trays by its own weight. Namely, in this feed tray, the locking is performed three times in a process of drawing the four staged-tray completely. 
     SUMMARY 
     In the above-described feed tray, in a process in which the rays are being drawn, the trays are engaged or locked with one another for a plurality of times until all the trays are completely drawn. Due to this, it is hard for a user to grasp whether or not a complete drawn state, in which all the trays are completely drawn, is achieved. 
     The present teaching has been made in view of the above-described situation, and an object of the present teaching is to provide a multiple-staged sheet tray in which the complete drawn state can be grasped easily. 
     According to an aspect of the present teaching, there is provided a sheet tray configured to support a sheet including: 
     a first tray including a first supporting surface configured to support the sheet; 
     a second tray including a second supporting surface configured to support the sheet,
         in a state that at least a portion of the second supporting surface is located on an opposite side in an orthogonal direction orthogonal to the first supporting surface, the second tray being supported by the first tray such that the second tray is slidably movable in a sliding direction, which is along the first supporting surface, between a first position and a second position, wherein the first position is a position at which the second supporting surface is overlapped with the first supporting surface, and the second position is a position at which the second supporting surface is overlapped with the first supporting surface and at which an overlapping area of the second supporting surface with respect to the first supporting surface is smaller than that at the first position; and       

     a third tray including a third supporting surface configured to support the sheet,
         in a state that at least a portion of the third supporting surface is located on an opposite side in an orthogonal direction orthogonal to the second supporting surface, the third tray being supported by the second tray such that the third tray is slidably movable in the sliding direction between a third position and a fourth position, wherein the third position is a position at which the third supporting surface is overlapped with the second supporting surface, and the fourth position is a position at which the third supporting surface is overlapped with the second supporting surface and at which an overlapping area of the third supporting surface with respect to the second supporting surface is smaller than that at the third position,       

     wherein the second tray includes a first engaging section configured to engage with the first tray at the second position; 
     the third tray includes a second engaging section configured to make contact with the second tray, in a drawing direction from the first position toward the second position, under a condition that the third tray is arranged at a fifth position located between the third and fourth positions, the second engaging section being configured to engage with the second tray at the fourth position; 
     the second engaging section is configured to be elastically deformable such that the second engaging section is movable in a releasing direction in which the contact between the second engaging section and the second tray is released; and 
     the second tray and the third tray are configured to be movable integrally in the drawing direction in a state that the second engaging section makes contact with the second tray. 
     According to the above configuration, in a case that the third tray is moved in the drawing direction, the third tray is moved to the fifth position, and the second engaging section of the third tray makes contact with the second tray in the drawing direction. In a case that the third tray is drawn further in the drawing direction, the third tray and the second tray are moved integrally, that is, the third tray is moved together with the second tray in the drawing direction in the state that the second engaging section makes contact with the second tray. In a case that the second tray is moved up to the second position, the first engaging section of the second tray engages with the first tray. Further, in a case that the third tray is moved up to the fourth position, the second engaging section of the third tray engages with the second tray. In such a manner, the first tray, the second tray and the third tray engage with one another in a state that the second tray is moved to the second position and the third tray is moved to the fourth position. 
     According to the present teaching, the user can easily grasp the state that all the trays are completely drawn. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a multi-function peripheral  10 . 
         FIG. 2  is a vertical cross-sectional view schematically depicting the internal structure of a printer section  11 . 
         FIG. 3  is a perspective view depicting a tray body  30  which is in an inclined state and in which a second tray  30 B and a third tray  30 C are each in a stored position. 
         FIG. 4  is a perspective view depicting the tray body  30  which is in the inclined state and in which the second tray  30 B and the third tray  30 C are each in a drawn position. 
         FIG. 5  is a perspective view depicting the tray body  30  which is in an erected state and in which the second tray  30 B and the third tray  30 C are each in the stored position. 
         FIG. 6A  is a vertical cross-sectional view at a center portion of the first tray  30 A in the erected state, and  FIG. 6B  is a vertical cross-sectional view at the center portion of the first tray  30 A in the inclined state. 
         FIG. 7  is a plane view depicting a rear surface  90 B of a first supporting plate  90  in the first tray  30 A. 
         FIG. 8  is a plane view depicting a front surface  101 A of a rear cover  101  in the first tray  30 A. 
         FIG. 9  is a plane view depicting a rear surface  111 B of a second supporting plate  111  in the second tray  30 B. 
         FIG. 10  is a plane view depicting a front surface  131 A of a third supporting plate  131  in the third tray  30 C. 
         FIG. 11  is a plane view of the first supporting plate  90 , the second supporting plate  111  and the third supporting plate  131  of a MP tray  13  in a first state, as seen from a rear side thereof. 
         FIG. 12  is a plane view of the first supporting plate  90 , the second supporting plate  111  and the third supporting plate  131  of the MP tray  13  in a second state, as seen from the rear side thereof. 
         FIG. 13  is a plane view of the first supporting plate  90 , the second supporting plate  111  and the third supporting plate  131  of the MP tray  13  in a third state, as seen from the rear side thereof. 
         FIG. 14  is a plane view of the first supporting plate  90 , the second supporting plate  111  and the third supporting plate  131  of the MP tray  13  in a fourth state, as seen from the rear side thereof. 
         FIG. 15A  is a cross-sectional view depicting a state that an engaging section  134  makes contact with a projection  112 ,  FIG. 15B  is a cross-sectional view depicting a state that an engaging section  116  engages with a projection  93 , and  FIG. 15C  is a cross-sectional view depicting a state that the engaging section  134  engages with the projection  112 . 
     
    
    
     DESCRIPTION OF THE EMBODIMENT 
     In the following, an embodiment of the present teaching will be explained. It is needless to say that the embodiment to be explained below is merely an example of the present teaching, and that it is possible to appropriately change the embodiment of the present teaching without departing from or changing the gist and scope of the present teaching. In the following explanation, an up/down direction  7  is defined with a state that a multi-function peripheral  10  is usably placed (usable state; state depicted in  FIG. 1 ), as the reference; a front/rear direction  8  is defined such that a surface on which an opening  14  of the multi-function peripheral  10  is provided is the frontward side (front side); and a left/right direction  9  is defined as viewing the multi-function peripheral  10  from the front side. In the following explanation of respective parts, components or elements of the multi-function peripheral  10 , it is assumed that the up/down direction  7 , the front/rear direction  8  and the left/right direction  9  are defined in a state that the respective parts, components or elements are incorporated or installed in the multi-function peripheral  10 . Note that the multi-function peripheral  10  is provided with movable parts or components. With respect to those movable parts, the up/down direction  7 , the front/rear direction  8  and the left/right direction  9  are defined with a regular state as depicted in  FIG. 1 , as the reference. 
     &lt;Overall Structure of Multi-Function Peripheral  10 &gt; 
     As depicted in  FIG. 1 , the multi-function peripheral  10  (an example of a sheet conveying apparatus) is formed to have a substantially rectangular parallelepiped shape. The multi-function peripheral  10  has a main body unit  10 A (hereinafter referred to also as the “body unit  10 A”, as appropriate). The body unit  10 A is provided with a scanner section  12  which allows an image sensor to read an image recorded on a manuscript (original) such as a recording paper (paper sheet) so as to acquire image data of the read image. The body unit  10 A is provided with a printer section  11  (an example of an apparatus main body, also referred to as the “apparatus body”, as appropriate) which is arranged on a location below the scanner section  12  and which is configured to record an image on recording sheet  15  (an example of a sheet; recording paper or recording paper sheet  15 ) based on the above-described image data, etc. The multi-function peripheral  10  is provided with a MP tray  13  which is arranged at a rear portion of the body unit  10 A (“MP” is an abbreviation of “Multi-Purpose”). The MP tray  13  has a tray main body  30  (an example of a sheet tray; hereinafter referred to also as the “tray body  30 ”, as appropriate) which is configured to be rotatable or pivotable with respect to the body unit  10 A. 
     &lt;Printer Section  11 &gt; 
     The printer section  11  has a printer casing  11 A in which a feed tray  20  is provided therein. The feed tray  20  A is configured to insertable and removal with respect to the printer casing  11 A via the opening  14  in the front/rear direction  8  and configured to accommodate a recording sheet  15  therein. A lower feed tray  20 A is arranged at a location below the feed tray  20 . Since the function of the lower feed tray  20 A is same as that of the feed tray  20 , the inner configuration of the printer section  11  depicted in  FIG. 2  only depicts the feed tray  20 , while omitting the lower feed tray  20 A. 
     As depicted in  FIG. 2 , a conveyance path  23  via which the recording sheet  15  is conveyed, and a recording section  24  configured to record an image, etc. on the recording sheet  15  conveyed in the conveyance path  23  are provide in the inside of the printer casing  11 A in the printer section  11 . Arrows  17  indicated in the conveyance path  23  indicate a conveyance direction in which the recording sheet  15  is conveyed. A conveying roller pair  59  is arranged in the conveyance path  23 , on the upstream side in the conveyance direction  17  of the recording section  24 . A discharging roller pair  64  is arranged in the conveyance path  23 , on the downstream side in the conveyance direction  17  of the recording section  24 . 
     A feeding roller  26  is arranged at a location above the feed tray  20  and below the recording section  24 . The feeding roller  26  is axially supported at a forward end portion of a feeding arm  27 . The feeding roller  26  is rotated by the driving force transmitted thereto from a feeding motor (not depicted in the drawings). The feeding arm  27  is rotated in directions indicated by a double-sided arrow  29 , about a shaft  28  which is provided at a basal end portion thereof as the rotating center. 
     The recording sheet  15  having the image recorded thereon in the recording section  24  is discharged to a discharge ray  21  provided on the upper surface of the feed tray  20 , and is supported by the discharge tray  21 . The discharge tray  21  is supported by the feed tray  20 . 
     &lt;Conveyance Path  23 &gt; 
     As depicted in  FIG. 2 , the conveyance path  23  is extended from a rear end portion of the feed tray  20 . The conveyance path  23  is provided with a curved portion  23 A and a linear portion  23 B. The curved portion  23 A extends while being curved, with a rear side thereof as a curvature outer side and a front side thereof as a curvature inner side. The linear portion  23 B is extended from an upper end portion of the curved portion  23 A and extends frontwardly. 
     The curved portion  23 A is defined by a first guide member  18  and a second guide member  19  facing each other with a predetermined spacing distance therebetween. The first guide member  18  defines the curvature outer side of the curved portion  23 A. A guide plate  22 A, having a non-illustrated separating section for preventing any overlapped feeding of the recording sheets  15 , is arranged between the first guide member  18  and a bottom plate  22  constructing the base of the feed tray  20 . The second guide member  19  defines the curvature inner side of the curved portion  23 A. The linear portion  23 B is defined by the recording section  24  and a platen  42  facing each other with a predetermined spacing distance therebetween at a position at which the recording section  24  is arranged. The first guide member  18  and the second guide member  19  are provided to extend in the left/right direction  9  that is a direction perpendicular to the sheet surface of  FIG. 2 . 
     The recording sheet  15  supported by the feed tray  20  is conveyed by the feeding roller  26  in the curved portion  23 A so as to make an upward U-turn from a lower portion toward an upper portion of the curved portion  23 A, and then reaches the conveying roller pair  59 . The recording sheet  15  pinched by the conveying roller pair  59  is conveyed frontwardly in the linear portion  23 B, with an image recording surface of the recording sheet  15  facing toward the recording section  24 . The recording sheet  15  arrived at a location immediately below the recording section  24  is subjected to image recording by which an image, etc. is recorded on the image recording surface of the recording sheet  15  by the recording section  24 . The recording sheet  15  having the image, etc. recorded thereon is conveyed frontwardly in the linear portion  23 B and is discharged to the discharge tray  21 . As described above, the recording sheet  15  is conveyed in the conveyance direction  17  indicated by dash-dot line arrows in  FIG. 2 . 
     &lt;Bypass Route  44 &gt; 
     As depicted in  FIG. 2 , a bypass route  44  is provided as a route or a path for feeding the recording sheet  15  to a location, in the conveyance path  23 , on the upstream side in the conveyance direction  17  of the conveying roller pair  59 , without via the curved portion  23 A. The bypass route  44  is composed of a route defined by a guide section  36  and a guide section  37 , and the linear portion  23 B of the conveyance path  23  in the inside of the printer casing  11 A. The recording sheet  15  supported by a supporting surface  31  of the MP tray  13  is guided by the guide members  36  and  37 , and a forward end portion of the recording sheet  15  (also referred to as an end portion in the feeding direction) makes contact with the conveying roller pair  59  (an example of a feeding section) to thereby subject the recording sheet  15  to the positioning. The positioned recording sheet  15  is fed in a feeding direction  87  and is conveyed in the linear portion  23 B by the conveying roller pair  59 , and the recording sheet  15  is further subjected to the image recording and has an image, etc., recorded thereon by the recording section  24 . The recording sheet  15  having the image, etc. recorded thereon is conveyed by the discharging roller pair  64  and is discharged to the discharge tray  21 . The specific of the guide section  36  will be described later on. 
     &lt;Recording Section  24 &gt; 
     As depicted in  FIG. 2 , the recording section  24  is arranged at a location above the linear portion  23 B and is provided with a carriage  40  and a recording head  38 . The platen  42  is disposed at a location which is below the recording section  24  and at which the platen  42  faces the recording section  24 . The plate  42  is a member configured to support, on an upper portion of the plate  42 , the recording sheet  15  which is being conveyed in the linear portion  23 B by the conveying roller pair  59 . 
     The carriage  40  is configured to be movable in the left/right direction  9  by two guide rails (not depicted in the drawings) which are arranged with a spacing distance therebetween in the front/rear direction  8 . The recording head  38  is mounted on the carriage  40 . An ink is supplied from, for example, an ink cartridge (not depicted in the drawings) to the recording head  24 . Nozzles  39  are formed in the lower surface of the recording head  38 . In a state that the carriage  40  is moving in the left/right direction  9 , the recording head  38  discharges or jets ink droplets of the ink toward the plate  42 . With this, an image, etc. is recorded on the recording sheet  15  in a state that the recording sheet  15  is supported by the plate  42 . 
     &lt;Conveying Roller Pair  59 &gt; 
     The conveying roller pair  59  is provided with a conveyance roller  60  arranged at a location above the linear portion  23 B and a pinch roller  61  arranged at a location below the linear portion  23 B while facing the conveying roller  60 . 
     &lt;Discharging Roller Pair  64 &gt; 
     As depicted in  FIG. 2 , the discharging roller pair  64  is provided with a discharge roller  62  arranged at a location below the linear portion  23 B and a spur  63  arranged at a location above the linear portion  23 B while facing the discharging roller  63 . 
     Each of the conveyance roller  60  and the discharge roller  62  is rotated by a driving force transmitted thereto from a conveyance motor (not shown). In a case that the conveyance roller  60  is rotated in a state that the recording sheet  15  is pinched by the conveying roller pair  59  (nip state), the recording paper  15  is conveyed by the conveying roller pair  59  in the conveyance direction  17 . In a case that the discharge roller  62  is rotated in a state that the recording sheet  15  is pinched by the discharging roller pair  64 , the recording paper  15  is conveyed by the discharging roller pair  64  in the conveyance direction  17 . 
     Note that in this embodiment, the system by which the recording section  24  records the image, etc. on the recording sheet  15  is the ink-jet recording system. Note that, however, the recording system is not limited to the ink-jet recording system. The image recording system may be, for example, the electro-photographic system, etc. 
     &lt;Scanner Section  12 &gt; 
     The scanner section  12  is configured as a so-called flat head scanner, and has a scanner main body  71  (also referred to as the “scanner body  71 ”, as appropriate) disposed on the body unit  10 A, and a manuscript cover  72  arranged on the scanner body  71 , as depicted in  FIG. 1 . A platen glass (not depicted in the drawings) is provided on the upper surface of the scanner body  71 . An image sensor (not depicted in the drawings) which is capable of optically reading an image of a manuscript or a document on the platen glass, is provided at the inside of the scanner body  71 . 
     &lt;MP Tray  13 &gt; 
     As depicted in  FIG. 2 , the MP tray  13  has a function of supplying a recording sheet  15  to the conveyance path  23  via the bypass route  44 . The MP tray  13  has the tray body  30  which is rotatably (pivotably) supported with respect to the body unit  10 A, with a rotary axis line  35  (see  FIG. 3 ) as the rotation center. The tray body  30  has the supporting surface  31  configured to support the recording sheet  15 . The supporting surface  31  supports the recording sheet  15  to be fed to the multi-function peripheral  10 . The tray body  30  is rotatable between an erected state depicted in  FIG. 5  and an inclined state depicted in  FIG. 3 . In the erected state of the tray body  30 , the supporting surface  31  is oriented frontward in a state that the supporting surface  31  is spreading or expanding along the up/down direction  7  and the left/right direction  9 . In the inclined state of the tray body  30 , the supporting surface  31  is in such a state that an upper end portion of the supporting surface  31  is away farther from the body unit  10 A than in the erected state of the tray body  30 . In  FIG. 2 , directions in which the tray body  30  is rotated are indicated by arrows  80  and  82 . 
     In the following explanation of the MP tray  13 , the respective parts or components of the MP tray  13  will be explained with reference to the respective directions regarding the tray body  30  in the erected state, namely the up/down direction  7 , the front/rear direction  8  and the left/right direction  9 . 
     &lt;Tray Body  30 &gt; 
     As depicted in  FIG. 4 , the tray body  30  has a first tray  30 A having a space therein (inner space; see  FIGS. 6A and 6B ); a second tray  30 B which is configured to be storable in the inner space of the first tray  30 A and to be drawnable from the inner space; and a third tray  30 C which is configured to be storable in the inner space of the first tray  30 A and to be drawnable from the inner space. It is possible to change the states of the second and third trays  30 B and  30 C from a stored state in which the second and third trays  30 B and  30 C are stored in the inner space of the first tray  30 A (see  FIG. 3 ) to a drawn state in which the second and third trays  30 B and  30 C are drawn (pulled out) from the inner space of the first tray  30 A (see  FIG. 4 ). With this, the tray body  30  and the supporting surface  31  are extended or elongated in a drawing direction  5  in which the second and third trays  30 B and  30 C are drawn. 
     In the following explanation of the tray body  30 , the shape, etc., of the tray body  30  will be explained by using the respective directions regarding the tray body  30  in the erected state. 
     &lt;Guide Section  36 &gt; 
     As depicted in  FIGS. 6A and 6B , the MP tray  13  is provided with the guide section  36 . The guide section  36  is positioned at a location in front of a first supporting surface  90 A (to be described later on) of the first tray  30 A. The guide section  36  guides, to the bypass route  44 , a recording sheet  15  which is fed while being supported by the first supporting surface  90 A of the first tray  30 A. The guide section  36  has an upper surface  36 A and a guide surface  36 B. A portion of the bypass route  44  is defined by the guide surface  36 B of the guide section  36  and a guide surface  37 A of the guide section  37  described below which are opposite to each other in the up/down direction  7 . 
     The upper surface  36 A is expanding along the front/rear direction  8  and the left/right direction  9  and faces (is oriented) upwardly. In the erected state of the tray body  30  as depicted in  FIG. 6A , a rear end portion of the upper surface  36 A is arranged closely to the first supporting surface  90 A and covers an upper portion of the bypass route  44 . With this, the guide section  36  functions as a lid of the bypass route  44 . On the other hand, in the inclined state of the tray body  30  as depicted in  FIG. 6B , a spacing distance or a gap between an upper end portion of the guide surface  36 B and the first supporting surface  90 A becomes large. With this, the spacing distance between the guide surface  36 B of the guide section  36  and the guide surface  37 A of the guide section  37  becomes large, thereby forming a portion of the bypass route  44 . 
     The guide section  36  is formed with a cutout portion, at a central portion in the left/right direction  9  in the rear end portion of the upper surface  36 A, such that the cutout portion has a shape recessing frontwardly. In conformity with this, a central portion in the left/right direction  9  in an upper end portion of the guide surface  36 B is expanding substantially along the up/down direction  7  and left/right direction  9 . With this, in a case that a recording sheet  15  having a small size (for example, an L-sized recording sheet  15  used in the photographic recording) is supported by the MP tray  13 , a user can easily take out the recording sheet  15  from the MP tray  13 . 
     &lt;First Tray  30 A&gt; 
     As depicted in  FIGS. 3 and 8 , the first tray  30 A has the first supporting plate  90  and a rear cover  101  (also see  FIGS. 6A and 6B ). The first supporting plate  90  has a plate portion  91  (see  FIG. 7 ) which is a plate-shaped member expanding in the up/down direction  7  and the left/right direction  9 , and an extended portion  92  (also see  FIGS. 6A and 6B  and  FIG. 7 ) which is extended rearwardly from a peripheral edge portion in the up/down direction  7  and left/right direction  9  of the plate portion  91 . The rear cover  101  is arranged on the rear side of the first supporting plate  90 , with a spacing distance from the plate portion  91 . 
     The plate portion  91  has a rectangular shape expanding along the up/down direction  7  and the left/right direction  9 . The extended portion  92  has a cylindrical (tubular) shape extending in the front/rear direction  8 . The rear cover  101  has a shape substantially same as that of the plate portion  91 . 
     As depicted in  FIGS. 6A and 6B , the extended portion  92  has a through hole  92 A formed in an upper portion thereof while penetrating through the upper portion in the up/down direction  7 . The through hole  92 A is located at an upper end portion of the first tray  30 A. The size in the left/right direction  9  of the through hole  92 A is greater than the size in the left/right direction  9  of the second tray  30 B. 
     &lt;Side Guide  32 &gt; 
     As depicted in  FIG. 3 , a pair of side guides  32  are disposed in the first supporting surface  90 A of the first tray  30 , respectively at locations on the left and right sides relative to the center in the left/right direction  9  of the first supporting surface  90 A. The side guides  32  extend parallel to the first supporting surface  90 A and along the up/down direction  7 , and are configured to movable in the first supporting surface  90 A along the left/right direction  9 . The side guides  32 A are connected by a publicly known connecting mechanism such that when one of the side guides  32  is moved leftwardly, the other of the side guides  32  is moved rightwardly, and that one of the side guides  32  is moved rightwardly, the other of the side guides  32  is moved leftwardly. The side guides  32  are arranged respectively on the left and right sides, with a central recessed portion  33  (see  FIG. 3 ; to be described later on) located on the central portion in the left/right direction  9  of the first tray  30 A being interposed between the sides guides  32 . By allowing surfaces, of the pair of side guides  32 , facing each other to make contact with both end portions in the left/right direction of the recording sheet  15 , respectively, the recording sheet  15  is positioned or aligned, with the center position in the left/right direction  9  in the first tray  30 A as the reference. 
     &lt;Central Recessed Portion  33 &gt; 
     As depicted in  FIG. 3 , the central recessed portion  33  is formed in the first supporting surface  90 A. The L-size which is used for the photographic recording is the smallest size usable in the multi-function peripheral  10 . The lower end of the central recessed portion  33  is located at a position lower than an upper end of a recording sheet  15  having the L-size and placed in the portrait (vertical) orientation. The upper end of the central recessed portion  33  is located at a position higher than an upper end of a recording sheet  15  having A4 size of Japanese Industrial Standard and supportable by the MP tray  30 , and placed in the landscape (horizontal) orientation, in a state that the second tray  30 B and the third tray  30 C are not drawn. 
     The central recessed portion  33  is formed to be recessed rearwardly in the first supporting surface  90 A, as depicted in  FIGS. 6A and 6B . Accordingly, in a state that the recording sheet  15  is supported on the first supporting surface  90 A, a spacing distance or a gap is generated between a surface, of the recording sheet  15  facing the first supporting surface  90 A and the central recessed portion  33 . When the recording sheet  15  is supported by the MP tray  13 , the recording sheet  15  is placed such that the forward end portion (end portion in the feeding direction) of the recording sheet  15  makes contact with the conveying roller pair  59 . Therefore, when a L-sized recording sheet  15  is placed in the MP tray  13 , the upper end of the L-sized recording sheet  15  is located at a low position as indicated by broken lines in  FIG. 3 . Also in this case, the spacing distance is generated between the upper end portion of the L-sized recording sheet  15  and the central recessed portion  33 , and thus a user can easily take out the L-sized recording sheet  15  supported by the MP tray  13 . 
     &lt;First Supporting Plate  90 &gt; 
     As depicted in  FIG. 3 , the first supporting plate  90  constructing the first tray  30 A has the first supporting surface  90 A expanding along the up/down direction  7  and the left/right direction  9  while facing frontwardly. The first supporting surface  90 A forms the supporting surface  31  in a state that the second tray  30 B and the third tray  30 C are stored in the first tray  30 A in the tray body  30  (see  FIG. 3 ). Further, the first supporting surface  90 A forms a portion of the supporting surface  31  in a state that the second tray  30 B and the third tray  30 C are drawn from the first tray  30 A in the tray body  30  (see  FIG. 4 ). 
     As depicted in  FIG. 7 , the first supporting plate  90  has a rear surface  90 B (an example of a projection supporting surface) expanding along the up/down direction  7  and the left/right direction  9  while facing rearwardly (the direction toward the front side of the sheet surface in  FIG. 7 ). The rear surface  90 B is provided with a pair of left and right projections  93 , a pair of left and right projection  94 , a pair of left and right projections  95 , a pair of left and right guide rails  96 . The projections  93 ,  94  and  95  and the guide rails  96  are integrally formed with the first supporting plate  90 . The first supporting plate  90  is formed, for example, of a resin. 
     The projections  95  are projected rearwardly from a lower end portion in the rear surface  90 B of the first supporting plate  90 . The projections  95  each have a shape in which a central portion thereof in the up/down direction  7  is raised in a mountain-like shape projecting outwardly in the left/right direction  9 . Each of the projections  95  has an upwardly inclined surface  95 A which is inclined downwardly from the upper end of the projection  95  and outwardly in the left/right direction  9  and which faces upwardly, and a downwardly inclined surface  95 B which is inclined upwardly from the lower end of the projection  95  and outwardly in the left/right direction  9  and which faces downwardly. The projections  95  are configured to correspond to engaging sections  133  in a third supporting plate  131  of the third tray  30 C (to be described later on). Each of the projections  95  is located at a position at which at least a portion of each of the projections  95  is overlapped with one of the engaging sections  133  in the third supporting surface  131  of the third tray  30 C in the front/rear direction  8  and the left/right direction  9 . 
     The projections  94  are projected rearwardly from a lower end portion in the rear surface  90 B of the first supporting plate  90 . The projections  94  are each formed to have a cylindrical shape or a tubular shape. Each of the projections  94  has a square cylindrical shape extending in the front/rear direction  8 . The projections  94  are located at the outer side in the left/right direction  9  relative to the projections  95 . Each of the projections  94  has a contact surface  94 A expanding in the front/rear direction  8  and the left/right direction  9  while facing upwardly. The projections  94  are configured to correspond to second cutout portions  114  in a second supporting plate  111  of the second tray  30 B (to be described later on). Each of the projections  94  is located at a position at which at least a portion of each of the projections  95  is overlapped with one of the second cutout portions  114  in the second supporting surface  111  of the second tray  30 B in the front/rear direction  8  and the left/right direction  9 . 
     The guide rails  96  are projecting rearwardly from a central portion in the up/down direction  7  in the rear surface  90 B of the first supporting plate  90 , while extending in the up/down direction  7 . The guide rails  96  are located at the outer side in the left/right direction  9  relative to the projections  94 . Each of the guide rails  96  is projected rearwardly, then is bent toward the inner side in the left/right direction  9 , and is extending in the up/down direction  7 . Each of the guide rails  96  has a sliding surface (not depicted in the drawings) which faces frontwardly and extends along the up/down direction  7  and the front/rear direction  8 . The guide rails  96  are configured to correspond to guide rails  119  in the second supporting plate  111  of the second tray  30 B (to be described later on). Each of the guide rails  96  is located at a position at which at least a portion of each of the guide rails  96  is overlapped with one of the guide rails  119  in the second supporting surface  111  of the second tray  30 B in the front/rear direction  8  and the left/right direction  9 . In a case that each of the guide rails  119  is allowed to enter a location in front of the sliding surface of one of the guide rails  96  from the inner side in the left-right direction  9 , the guide rails  96  and the guide rails  119  become slidably movable with respect to each other in the up/down direction  7 . 
     As depicted in  FIG. 7  (also see  FIG. 15B ), the projections  93  (an example of a second projection) are projected rearwardly from a central portion in the up/down direction  7  in the rear surface  90 B of the first supporting plate  90 . Each of the projections  93  is formed as three ribs extending in the up/down direction  7 . The projections  93  are located at the outer side in the left/right direction  9  relative to the guide rails  96 . Each of the projections  93  has an upwardly inclined surface  93 A which is inclined downwardly (in the down direction) and rearwardly from the upper end of the projection  93  and which faces upwardly (an example of an inclined surface), and a downwardly inclined surface  93 B which is inclined upwardly (in the up direction) and rearwardly from the lower end of the projection  95  and which faces downwardly (also see  FIG. 15B ). The projections  93  are configured to correspond to engaging sections  116  in the second supporting plate  111  of the second tray  30 B (to be described later on). Each of the projections  93  is located at a position at which at least a portion of each of the projections  93  is overlapped with one of the engaging sections  116  in the second supporting surface  111  of the second tray  30 B in the front/rear direction  8  and the left/right direction  9 . 
     &lt;Rear Cover  101 &gt; 
     As depicted in  FIG. 8 , the rear cover  101  (an example of a cover) has a front surface  101 A which faces frontwardly and expands entirely in the rear cover  101  along the up/down direction  7  and the left/right direction  9 . The front surface  101 A is provided with a pair of left and right projections  102 , a pair of left and right projection  103 , and a pair of left and right projections  104 , a pair of left and right projection  106 . The projections  102 ,  103 ,  104  and  106  are integrally formed with the rear cover  101 . The rear cover  101  is formed, for example, of a resin. 
     The projections  102  are projected frontwardly from a upper end portion which also forms end portions in the left/right direction  9  in the front surface  101 A of the rear cover  101 . The projections  102  each have a cylindrical shape. Each of the projections  102  has a contact surface  102 A expanding in the front/rear direction  8  and the left/right direction  9  while facing downwardly. The projections  102  are configured to correspond to upper contact surfaces  117 A of extended portions  117  in the second supporting plate  111  of the second tray  30 B (to be described later on). Each of the projections  102  is located at a position at which at least a portion of each of the projections  102  is overlapped with the upper contact surface  117 A of one of the extended portions  117  in the second supporting plate  111  of the second tray  30 B in the front/rear direction  8  and the left/right direction  9 . 
     The projections  103  are projected frontwardly from a lower end portion which also forms an end portion in the left/right direction  9  in the front surface  101 A of the rear cover  101 . Each of the projections  103  is formed as a rib which is H-shaped as seen from the front/rear direction  8 . Each of the projections  103  has a contact surface  103 A expanding in the front/rear direction  8  and the left/right direction  9  while facing upwardly. The projections  103  are configured to correspond to lower contact surfaces  117 B of the extended portions  117  in the second supporting plate  111  of the second tray  30 B (to be described later on). Each of the projections  103  is located at a position at which at least a portion of each of the projections  103  is overlapped with the lower contact surface  117 B of one of the extended portions  117  in the second supporting plate  111  of the second tray  30 B in the front/rear direction  8  and the left/right direction  9 . 
     The projections  104  are projected frontwardly from a lower end portion which also forms a central portion in the left/right direction  9  in the front surface  101 A of the rear cover  101 . Each of the projections  104  is a rib extending in the up/down direction  7 . Each of the projections  104  has a contact surface  104 A expanding in the front/rear direction  8  and the left/right direction  9  while facing upwardly. The projections  104  are configured to correspond to first cutout portions  115  in the second supporting plate  111  of the second tray  30 B (to be described later on). Each of the projections  104  is located at a position at which at least a portion of each of the projections  104  is overlapped with one of the cutout portions  115  in the second supporting plate  111  of the second tray  30 B in the front/rear direction  8  and the left/right direction  9 . 
     The projections  106  are projected frontwardly from outer end portions in the left/right direction  9  which also form a central portion in the up/down direction  7  in the front surface  101 A of the rear cover  101 . Each of the projections  106  is formed to have a cubic shape. The projections  106  are located at the outer side in the left/right direction  9  relative to the projections  103 . Each of the projections  106  has a threaded hole (not depicted in the drawings) recessed inwardly from the outer surface of the projection  96  in the left/right direction  9 . The position in the left/right direction  9  of the outer surface of each of the projections  96  corresponds to an inner surface in the left/right direction  9  in the extended portion  92  of the first supporting plate  90 . The position of the threaded hole of each of the projections  106  corresponds to one of through holes  97  in the extended portion  92  of the first supporting plate  90 . 
     The rear cover  101  has a cutout portion  105  recessed downwardly from the upper edge of the rear cover  101  at a central portion in the left/right direction  9  of the rear cover  101 . The cutout  105  has a rectangular shape elongated in the left/right direction  9 . The cutout portion  105  is located at a location above the projections  104 . Further, the cutout portion  105  is located at the inner side in the left/right direction  9  relative to the projections  103 . The width in the left/right direction  9  of the cutout portion  105  is substantially same as the width in the left/right direction  9  of the third tray  30  (to be described later on). 
     &lt;Second Tray  30 B&gt; 
     As depicted in  FIG. 9 , the second tray  30 B has the second supporting plate  111  which is a plate-shaped member expanding along the up/down direction  7  and the left/right direction  9 . 
     The second supporting plate  111  has a second supporting surface  111 A (also see  FIG. 4 ) expanding entirely in the second supporting plate  111  along the up/down direction  7  and the left/right direction  9 , while facing frontwardly, and a rear surface  111 B expanding along the up/down direction  7  and the left/right direction  9 , while facing rearwardly. 
     The rear surface  111 B is provided with a pair of left and right projections  112 , a pair of left and right projection  113 , a pair of left and right second cutout portions  114 , a pair of left and right first cutout portions  115 , a pair of left and right engaging sections  116 , a pair of left and right extended portions  117 , a pair of left and right guide rails  118 , a pair of left and right guide rails  119 , a pair of left and right projections  120 , and a pair of left and right projections  121 . The projections  112 , the projections  113 , the second cutout portions  114 , the first cutout portions  115 , the engaging sections  116 , the extended portions  117 , the guide rails  118 , the guide rails  119 , the projections  120  and the projections  121  are integrally formed with the second supporting plate  111 . The second supporting plate  111  is formed, for example, of a resin. 
     The first cutout portions  115  are recessed upwardly from a lower end edge of the second supporting plate  111  at a central portion in the left/right direction  9  of the second supporting plate  111 . Each of the first cutout portions  115  has a rectangular shape. Each of the first cutout portions  115  has a contact surface  115 A expanding in the front/rear direction  8  and the left/right direction  9  while facing downwardly. The first cutout portions  115  are configured to correspond to the projections  104  in the rear cover  101  of the first tray  30 A. Each of the first cutout portions  115  is located at a position at which at least a portion of each of the first cutout portions  115  is overlapped with one of the projections  104  in the rear cover  101  of the first tray  30 A in the front/rear direction  8  and the left/right direction  9 . 
     The projections  112  are projected rearwardly from an upper end portion in the rear surface  111 B of the second supporting plate  111 . Each of the projections  112  is a rib extending in the left/right direction  9 . The projections  112  are located at the outer side in the left/right direction  9  relative to the first cutout portions  115 . Each of the projections  112  has an upper surface  112 A which is expanding in the front/rear direction  8  and the left/right direction  9  and which faces upwardly, and a lower surface  112 B which is expanding in the front/rear direction  8  and the left/right direction  9  and which faces downwardly. The projections  112  are configured to correspond to engaging sections  134  in the third supporting plate  131  of the third tray  30 C (to be described later on). Each of the projections  112  is located at a position at which at least a portion of each of the projections  112  is overlapped with one of the engaging sections  134  in the third supporting plate  131  of the third tray  30 C in the front/rear direction  8  and the left/right direction  9 . 
     The projections  120  are projected rearwardly from a lower end portion in the rear surface  111 B of the second supporting plate  111 . The projections  120  each have a cylindrical (tubular) shape. The projections  120  are located in the left/right direction  9  at positions which are substantially same as those of the projections  112 , respectively. Each of the projections  120  has a contact surface  120 A expanding in the front/rear direction  8  and the left/right direction  9  while facing upwardly. The projections  120  are configured to correspond to contact walls  137  in the third supporting plate  131  of the third tray  30 C (to be described later on). Each of the projections  120  is located at a position at which at least a portion of each of the projections  120  is overlapped with one of the contact walls  137  in the third supporting plate  131  of the third tray  30 C in the front/rear direction  8  and the left/right direction  9 . 
     The guide rails  118  are projecting rearwardly from substantially the entire area in the up/down direction  7  in the rear surface  111 B of the second supporting plate  111 , while extending in the up/down direction  7 . The guide rails  118  are located at substantially same positions as the outer edges in the left/right direction  9  of the projections  120 . Each of the guide rails  118  is projected rearwardly, then is bent toward the inner side in the left/right direction  9 , and is extending in the up/down direction  7 . Each of the guide rails  118  has a sliding surface (not depicted in the drawings) which faces frontwardly and extends along the up/down direction  7  and the front/rear direction  8 . The guide rails  118  are configured to correspond to guide rails  135  in the third supporting plate  131  of the third tray  30 C (to be described later on). Each of the guide rails  118  is located at a position at which at least a portion of each of the guide rails  118  is overlapped with one of the guide rails  135  in the third supporting surface  131  of the third tray  30 C in the front/rear direction  8  and the left/right direction  9 . In a case that each of the guide rails  135  is allowed to enter a location in front of the sliding surface of one of the guide rails  118  from the inner side in the left-right direction  9 , the guide rails  118  and the guide rails  135  become slidably movable with respect to each other in the up/down direction  7 . 
     The projections  113  (an example of a first projection) are projected rearwardly from an upper end portion in the rear surface  111 B of the second supporting plate  111 . Each of the projections  113  is a rib having a T-shape. The projections  113  are located at the outer side in the left/right direction  9  relative to the guide rails  118 . Each of the projections  113  has a contact surface  113 A which is expanding in the front/rear direction  8  and the left/right direction  9  and which faces downwardly. The projections  113  are configured to correspond to projections  132  in the third supporting plate  131  of the third tray  30 C (to be described later on). Each of the projections  113  is located at a position at which at least a portion of each of the projections  113  is overlapped with one of the projections  132  in the third supporting surface  131  of the third tray  30 C in the front/rear direction  8  and the left/right direction  9 . 
     The second cutout portions  114  are recessed upwardly from the lower end edge of the second supporting plate  111 . Each of the second cutout portions  114  has a rectangular shape. The second cutout portions  114  are arranged at positions which are substantially same in the left/right direction  9  relative to the projections  113 . Each of the second cutout portions  114  has a contact surface  114 A expanding in the front/rear direction  8  and the left/right direction  9  while facing downwardly. The second cutout portions  114  are configured to correspond to the projections  94  in the first supporting plate  90  of the first tray  30 A. Each of the second cutout portions  114  is located at a position at which at least a portion of each of the second cutout portion  114  is overlapped with one of the projections  94  in the first supporting plate  90  of the first tray  30 A in the front/rear direction  8  and the left/right direction  9 . 
     The projections  121  are projected from the upper end portion of the second supporting plate  111 , respectively toward the inner sides in the left/right direction  9 . Each of the projections  121  is formed to have a cubic shape. The projections  121  are located at the outer side in the left/right direction  9  relative to the second cutout portions  114 . Each of the projections  121  has a contact surface  121 A which is expanding in the front/rear direction  8  and the left/right direction  9  and which faces upwardly. The projections  121  are configured to correspond to an operation section  136  in the third supporting plate  131  of the third tray  30 C (to be described later on). Each of the projections  121  is located at a position at which at least a portion of each of the projections  113  is overlapped with the operating section  136  in the third supporting surface  131  of the third tray  30 C in the front/rear direction  8  and the left/right direction  9 . 
     The guide rails  119  are projecting frontwardly from a central portion in the up/down direction  7  in the second supporting surface  111 A of the second supporting plate  111 , while extending in the up/down direction  7 . The guide rails  119  are located at the outer side in the left/right direction  9  relative to the second cutout portions  114 . Each of the guide rails  119  is projected frontwardly, then is bent toward the outer side in the left/right direction  9 , and is extending in the up/down direction  7 . Each of the guide rails  119  has a sliding surface  119 A (see  FIG. 11 ) which faces rearwardly and extends along the up/down direction  7  and the front/rear direction  8 . The guide rails  119  are configured to correspond to the guide rails  96  in the first supporting plate  90  of the first tray  30 A. Each of the guide rails  119  is located at a position at which at least a portion of each of the guide rails  119  is overlapped with one of the guide rails  96  in the first supporting plate  90  of the first tray  30 A in the front/rear direction  8  and the left/right direction  9 . In a case that each of the guide rails  96  is allowed to enter a location behind (on the rear side of) the sliding surface  119 A of one of the guide rails  119  from the outer side in the left-right direction  9 , the guide rails  119  and the guide rails  96  become slidably movable with respect to each other in the up/down direction  7 . 
     The engaging sections  116  (an example of a first engaging section) are located at a lower end portion of the second supporting plate  111 . The engaging sections  116  are located at the outer side in the left/right direction  9  relative to the guide rails  119 . As depicted in  FIG. 15B , each of the engaging sections  116  has an elastic portion  116 C configured to be elastically deformable and a projecting portion  116 D which projects frontwardly at a lower end portion of the elastic portion  116 C. The projecting portion  116 D has a downwardly inclined surface  116 A which is inclined frontwardly and upwardly (in the up direction) from the lower end of the projecting portion  116 D and which faces (is oriented) downwardly, and an upwardly inclined surface  116 B which is inclined frontwardly and downwardly (in the down direction) from the upper end of the projecting portion  116 D and which faces (is oriented) upwardly. The downwardly inclined surface  116 A and the upwardly inclined surface  116 B are located in front of the second supporting surface  111 A. Each of the engaging sections  116  is formed such that the projecting portion  116 D is movable in the front/rear direction  8  by the elastic deformation of the elastic portion  116 C. In other words, Each of the engaging sections  116  is formed such that the elastic portion  116 C is elastically deformed to thereby allow the projecting portion  116 D to be movable in the front/rear direction  8 . The engaging sections  116  are configured to correspond to the projections  93  in the first supporting plate  90  of the first tray  30 A. Each of the engaging sections  116  is located at a position at which at least a portion of each of the engaging sections  116  is overlapped with one of the projections  93  in the first supporting surface  90  of the first tray  30 A in the front/rear direction  8  and the left/right direction  9 . 
     The extended portions  117  (an example of a third projection) are projected outwardly in the left/right direction  9  from a lower end portion of the second supporting plate  111 . The extended portion  117  each have a rectangular planar shape. Each of the extended portions  117  has an upper contact surface  117 A expanding in the front/rear direction  8  and the left/right direction  9  while facing upwardly, and a lower contact surface  117 B expanding in the front/rear direction  8  and the left/right direction  9  while facing downwardly. The upper contact surface  117 A of each of the extended portions  117  is configured to correspond to one of the projections  102  in the rear cover  101  of the first tray  30 A. The lower contact surface  117 B of each of the extended portions  117  is configured to correspond to one of the projections  103  in the rear cover  101  of the first tray  30 A. The upper contact surface  117 A of each of the extended portions  117  is located at a position at which at least a portion of the upper contact surface  117 A is overlapped with one of the projections  102  in the rear cover  101  of the first tray  30 A in the front/rear direction  8  and the left/right direction  9 . 
     &lt;Third Tray  30 C&gt; 
     As depicted in  FIG. 10 , the third tray  30 C has the third supporting plate  131  which is a plate-shaped member expanding along the up/down direction  7  and the left/right direction  9 . 
     The third supporting plate  131  has a third supporting surface  131 A expanding entirely in the third supporting plate  131  along the up/down direction  7  and the left/right direction  9 , while facing frontwardly. 
     The third supporting surface  131 A is provided with a pair of left and right projections  132 , a pair of left and right engaging sections  133 , a pair of left and right engaging sections  134  and a pair of left and right guide rails  135 . The projections  132 , the engaging sections  133 , the engaging sections  134  and the guide rails  135  are integrally formed with the third supporting plate  131 . The third supporting plate  131  is formed, for example, of a resin. 
     The engaging sections  134  (an example of a second engaging section) are located at a lower end portion of the third supporting plate  131 . As depicted in  FIGS. 15A and 15C , each of the engaging sections  134  has an elastic portion  134 C configured to be elastically deformable and a projecting portion  134 D which projects frontwardly at a lower end portion of the elastic portion  134 C. The projecting portion  134 D has a downwardly inclined surface  134 A which is inclined frontwardly and upwardly (in the up direction) from the lower end of the projecting portion  134 D and which faces (is oriented) downwardly, and an upwardly inclined surface  134 B which is inclined frontwardly and downwardly (in the down direction) from the upper end of the projecting portion  134 D and which faces (is oriented) upwardly. The downwardly inclined surface  134 A and the upwardly inclined surface  134 B are located in front of the third supporting surface  131 A. Each of the engaging sections  134  is formed such that the projecting portion  134 D is movable in the front/rear direction  8  by the elastic deformation of the elastic portion  134 C. In other words, Each of the engaging sections  134  is formed such that the elastic portion  134 C is elastically deformed to thereby allow the projecting portion  134 D to be movable in the front/rear direction  8 . The engaging sections  134  are configured to correspond to the projections  112  in the second supporting plate  111  of the second tray  30 B. Each of the engaging sections  134  is located at a position at which at least a portion of each of the engaging sections  134  is overlapped with one of the projections  112  in the second supporting surface  112  of the second tray  30 B in the front/rear direction  8  and the left/right direction  9 . 
     The engaging sections  133  (an example of a third engaging section) are projected downwardly from a lower end edge at a portion located closely to a central portion in the left/right direction  9  of the third supporting plate  131 . The projections  133  are located on the inner side in the left/right direction  9  relative to the engaging sections  134 . As depicted in  FIG. 10 , each of the projections  133  has an elastic portion  133 C configured to be elastically deformable and a projecting portion  133 D which projects inwardly in the left/right direction  9  at a lower end portion of the elastic portion  133 C. The projecting portion  133 D has a downwardly inclined surface  133 A which is inclined inwardly in the left/right direction  9  and upwardly from a lower end of the projecting portion  133 D and which is oriented downwardly, and an upwardly inclined surface  133 B which is inclined inwardly in the left/right direction  9  and downwardly (in the down direction) from the upper end of the projecting portion  133 D and which is oriented upwardly. Each of the engaging sections  133  is formed such that the projecting portion  133 D is movable in the left/right direction  9  by the elastic deformation of the elastic portion  133 C. In other words, Each of the engaging sections  133  is formed such that the elastic portion  133 C is elastically deformed to thereby allow the projecting portion  133 D to be movable in the left/right direction  9 . The engaging sections  133  are configured to correspond to the projections  95  in the first supporting plate  90  of the first tray  30 A. 
     The contact walls  137  are projected frontwardly from a lower end edge in the third supporting surface  131 A of the third supporting plate  131 . The contact walls  137  are each formed as a rib extending in the left/right direction  9 . The contact walls  137  are located at the outer side in the left/right direction  9  relative to the engaging sections  134 . Each of the contact walls  137  has a contact surface  137 A expanding in the front/rear direction  8  and the left/right direction  9  while facing upwardly. The contact walls  137  are configured to correspond to projections  120  in the second supporting plate  111  of the second tray  30 B. Each of the contact walls  137  is located at a position at which at least a portion of each of the contact walls  137  is overlapped with one of the projections  120  in the second supporting plate  111  of the second tray  30 B in the front/rear direction  8  and the left/right direction  9 . 
     The guide rails  135  are projecting frontwardly from a lower end portion in the third supporting surface  131 A of the third supporting plate  131 , while extending in the up/down direction  7 . The guide rails  135  are located at substantially same positions as the outer edges in the left/right direction  9  of the contact walls  137 . Each of the guide rails  135  is projected frontwardly, then is bent toward the outer side in the left/right direction  9 , and is extending in the up/down direction  7 . Each of the guide rails  135  has a sliding surface (not depicted in the drawings) which faces rearwardly and extends along the up/down direction  7  and the front/rear direction  8 . The guide rails  135  are configured to correspond to the guide rails  118  in the second supporting plate  111  of the second tray  30 B. Each of the guide rails  135  is located at a position at which at least a portion of each of the guide rails  135  is overlapped with one of the guide rails  118  in the second supporting plate  111  of the second tray  30 B in the front/rear direction  8  and the left/right direction  9 . In a case that each of the guide rails  118  is allowed to enter a location behind the sliding surface of one of the guide rails  135  from the outer side in the left-right direction  9 , the guide rails  135  and the guide rails  118  become slidably movable with respect to each other in the up/down direction  7 . 
     The projections  132  are projected frontwardly from an lower end portion in the third supporting surface  131 A of the third supporting plate  131 . Each of the projections  132  is a rib which is an inverted T-shaped as seen from the front/rear direction  8 . The projections  132  are located at the outer side in the left/right direction  9  relative to the guide rails  135 . Each of the projections  132  has a contact surface  132 A which is expanding in the front/rear direction  8  and the left/right direction  9  and which faces upwardly. The projections  132  are configured to correspond to the projections  113  in the second supporting plate  111  of the second tray  30 B. Each of the projections  132  is located at a position at which at least a portion of each of the projections  132  is overlapped with one of the projections  113  in the second supporting surface  111  of the second tray  30 B in the front/rear direction  8  and the left/right direction  9 . 
     The third supporting plate  131  has an operating section  136  which is plate-shaped and formed at an upper end edge of the third supporting surface  131 , projecting frontwardly from the supporting surface  131 A and expanding along the front/rear direction  8  and the left/right direction  9 . The operating section  136  has a rectangular planar shape. As depicted in  FIG. 11 , the operating section  136  is provided with a lower surface  136 A formed in a rear end portion of the operating section  136 , expanding along the front/rear direction  8  and the left/right direction  9  while facing downwardly. The lower surface  136 A is configured to correspond to the projections  121  of the second supporting plate  111 . 
     &lt;Assembly of First Tray  30 A, Second Tray  30 B and Third Tray  30 C&gt; 
     As depicted in  FIGS. 11 to 14 , the first supporting plate  90  of the first tray  30 A and the second supporting plate  111  of the second tray  30 B are assembled to each other such that the sliding surfaces (not depicted in the drawings) in the guide rails  96  of the first supporting plate  90  and the sliding surfaces  119 A in the guide rails  119  of the second supporting plate  111  are opposite to each other. With this, the first supporting plate  90  and the second supporting plate  111  are allowed to be slidable (slidably movable) with respect to each other in the up/down direction  7  (an example of a sliding direction). 
     The second supporting plate  111  of the second tray  30 B and the third supporting plate  131  of the third tray  30 C are assembled to each other such that the sliding surfaces (not depicted in the drawings) in the guide rails  118  of the second supporting plate  111  and the sliding surfaces (not depicted in the drawings) in the guide rails  135  of the third supporting plate  131  are opposite to each other. With this, the second supporting plate  111  and the third supporting plate  131  are allowed to be slidable with respect to each other in the up/down direction  7  (an example of the sliding direction). 
     The rear cover  101  of the first tray  30 A is assembled to the first cover  30 A such that the peripheral edge portion of the front surface  101 A of the rear cover  101  makes contact with the rear end portion of the extended portion  92  of the first supporting plate  90 . Then, the screw holes of the projections  106  in the rear cover  101  are positioned and screwed with the through holes  97  of the extended portion  92  in the first supporting plate  90 . 
     &lt;Drawing Operation&gt; 
     &lt;First State&gt; 
     A first state depicted in  FIG. 11  is a such a state that the second tray  30 B and the third tray  30 C are stored in the inside of the first tray  30 A. In the first state, the second tray  30 B is located at a stored position with respect to the first tray  30 A (an example of a first position, hereinafter simply referred to as the “stored position of the second tray  30 B”). Further, in the first state, the third tray  30 C is at a stored position with respect to the second tray  30 B (an example of a third position, hereinafter simply referred to as the “stored position of the third tray  30 C”). Note the rear cover  101  is omitted in  FIGS. 11 to 14  for convenience of explanation. 
     At the stored position of the second tray  30 B, the contact surface  94 A of each of the projections  94  in the first supporting plate  90  makes contact, in the up/down direction, with the contact surface  114 A of one of the second cutout portions  114  in the second supporting plate  111 . Further, the contact surface  103 A of each of the projections  103  in the rear cover  101  makes contact, in the up/down direction  7 , with the lower surface  117 B of one of the extended portions  117  in the second supporting plate  111 . With this, downward movement of the second tray  30 B to a position below (lower than) the stored position of the second tray  30 B with respect to the first tray  30 A is regulated or restricted. At the stored position of the second tray  30 B, the second supporting plate  111  is overlapped with the first supporting plate  90  in the front/rear direction  8 , in a state that the second supporting plate  111  is located on the rear side of the first supporting plate  90 . 
     At the stored position of the third tray  30 C, the contact surface  120 A of each of the projections  120  in the second supporting plate  111  makes contact, in the up/down direction  7 , with the contact surface  137 A of one of the contact walls  137  in the third supporting plate  131  (see  FIG. 15A ). Further, the contact surface  121 A of each of the projections  121  in the second supporting plate  111  makes contact, in the up/down direction  7 , with one of the end portions in the left/right direction  9  of the lower surface  136 A in the operating section  136  (see  FIG. 11 ). With this, downward movement of the third tray  30 C to a position lower than the stored position of the third tray  30 C with respect to the second tray  30 B is regulated or restricted. At the stored position of the third tray  30 C, the third supporting plate  131  is overlapped with the second supporting plate  111  in the front/rear direction  8 , in a state that the third supporting plate  131  is located on the rear side of the second supporting plate  111 . 
     Furthermore, in the first state, the upwardly inclined surface  133 B of each of the engaging sections  133  in the third supporting plate  131  makes contact with the downwardly inclined surface  95 B of one of the projections  95  in the first supporting plate  90 , and thus the engaging sections  133  engage with the projections  95 . With this, in a state that any force sufficient for releasing the engagement of the engaging sections  133  with respect to the projections  95  is not applied to the third tray  30  in the up direction (an example of a drawing direction), upward movement of the third tray  30 C to a position above the stored position of the third tray  30 C with respect to the second tray  30 B is prevented. 
     In the first state, the second tray  30 B and the third tray  30 C are positioned in a space defined between the first supporting plate  90  and the rear cover  101  of the first tray  30 A. 
     In a case that a user operates the operating section  136  of the third tray  30 C in the first state so as to lift (draw or pull) the third tray  30 C from the first state upwardly, the tray body  30  is eventually changed to have an elongated state depicted in  FIG. 14 . 
     In a case that the third tray  30 C is moved from the first state upwardly via the through holes  97 , the engagement of the engaging sections  133  with respect to the projections  95  is released. Specifically, at first, the projecting portion  133 D of each of the engaging sections  133  slidably moves in the downwardly inclined surface  95 B and moves upwardly. Accompanying with this, the elastic portion  133 C of each of the engaging sections  133  is elastically deformed, thereby allowing the projecting portion  133 D to move outwardly in the left/right direction  9  along the downwardly inclined surface  95 B. Then, after the projecting portion  133 D climbs over the downwardly inclined surface  95 B to be a position above the downwardly inclined surface  95 B, the projecting portion  133 D moves upwardly while moving to the inner side in the left/right direction  9  along the upwardly inclined surface  95 A. 
     Afterwards, the third tray  30 C moves upwardly, while the second tray  30 C is remaining in a stopped state (non-moving state). Then, the tray body  30  reaches a second state as depicted in  FIG. 12 . 
     &lt;Second State&gt; 
     In the second state depicted in  FIG. 12 , the second tray  30 B is at the stored position with respect to the first tray  30 A. Further, in the second state, the third tray  30 C is located at a first contact position (an example of a fifth position). The first contact position in a position at which the lower surface  112 B of each of the projections  112  in the second supporting plate  111  makes contact, in the up/down direction  7 , with the upwardly inclined surface  134 B of one of the engaging sections  134  in the third supporting plate  131  (see  FIG. 15A ). 
     Namely, in a drawing process for drawing the third tray  30 C from the first state up to the second state, the state in which the projections  112  and the engaging sections  134  are apart (separated) from each other is changed to the contact state, as depicted in  FIG. 15A , in which the projections  112  and the engaging sections  134  make contact with each other. 
     In a case that the third tray  30 C is further moved upwardly from the second state, the engaging sections  134  of the third supporting plate  131  pull the projections  112  of the second supporting plate  111 , without climbing over the projections  112 . A force required for elastically deforming the elastic portion  134 C of each of the engaging sections  134  in a direction separating the projecting portion  134 D of each of the engaging sections  134  away from one of the projections  112  is greater than the force for pulling the second tray  30 B upwardly (for example, the weight of the second tray  30 B). Accordingly, the second tray  30  is moved upwardly via the through holes  97 , following the movement of the third tray  30 C. Then, the second tray  30 B is moved up to a second contact position with respect to the first tray  30 A. The second contact position is a position at which the downwardly inclined surface  93 B of each of the projections  93  in the first supporting plate  90  makes contact, in the up/down direction  7 , with the upwardly inclined surface  116 B of one of the engaging sections  116  in the second supporting plate  111 . 
     In a case that the third tray  30 C is moved further upwardly from a state that the third tray  30 C is located at the first contact position and the second tray  30 B is located at the second contact position, a rearward force is applied, by the downwardly inclined surface  93 B of each of the projecting portions  93 , to the upwardly inclined surface  116 B of one of the engaging sections  116  in the second supporting plate  111 . A force for elastically deforming the elastic portion  116 C in a direction separating the projecting portion  116 D of each of the engaging sections  116  away from one of the projections  93  (namely, in a rearward direction) is weaker than the force applied to the upwardly inclined surface  116 B by the downwardly inclined surface  93 B when the third tray  30 C located at the first contact position with respect to the second tray  30 B is pulled upwardly (for example, the elastic deformation force of the elastic portion  134 C of each of the engaging sections  134 ). Accordingly, the elastic portion  116 C of each of the engaging sections  116  is elastically deformed so as to allow the upwardly inclined surface  116 B to move in a direction for separating the upwardly inclined surface  116 B away from the projection  93  (in a rearward direction). With this, the contact between the downwardly inclined surface  93 B of each of the projections  93  and the upwardly inclined surface  116 B of one of the engaging sections  116  is released, thereby allowing the third tray  30  to move further upwardly with respect to the second tray  30 B. Then, the state of the tray body  30  reaches a third stated as depicted in  FIG. 13 . 
     &lt;Third State&gt; 
     In the third state depicted in  FIG. 13 , the second tray  30 B is at a drawn position with respect to the first tray  30 A (an example of a second position; hereinafter referred to simply as the “drawn position of the second tray  30 B). Further, in the third state, the second tray  30 B is located at the first contact position. 
     At the drawn position of the second tray  30 B, the contact surface  102 A of each of the projections  102  in the rear cover  101  of the first tray  30 A makes contact, in the up/down direction  7 , with the upper contact surface  117 A of one of the extended portions  117  in the second supporting surface  111  of the second tray  30 B. With this, upward movement of the second tray  30 B up to a position above the drawn position of the second tray  30 B with respect to the first tray  30 A is regulated. Also at the drawn position of the second tray  30 B, the second supporting plate  111  is overlapped with the first supporting plate  90  in the front/rear direction  8 , in a state that the second supporting plate  111  is located behind (located on the rear side of) the first supporting plate  90 , with an overlapping area smaller than that in the case that the second tray  30 B is located at the first position. 
     Further, at the drawn position of the second tray  30 B with respect to the first tray  30 A, the downwardly inclined surface  116 A in each of the engaging sections  116  in the second supporting plate  111  of the second tray  30 B makes contact, in the up/down direction  7 , with the upwardly inclined surface  93 A of one of the projections  93  in the first supporting plate  90  of the first tray  30 A, and thus the engaging sections  116  engage with the projections  93  (see  FIG. 15B ). With this, in a state that the user is not pressing the second tray  30 B and the third tray  30 B in a direction opposite to the drawing direction  5  so as to store the second tray  30 B and the third tray  30 C in the first tray  30 A, downward movement of the second tray  30 B to a position below the stored position of the second tray  30 B with respect to the first tray  30 A is prevented. 
     Since the upwardly inclined surface  93 A and the downwardly inclined surface  93 B of each of the projections  93  are inclined as depicted in  FIG. 15B , the projecting portion  116 D of one of the engaging sections  116  is gradually moved rearwardly, and then is gradually moved frontwardly during a process that the engaging sections  116  are engaging with the projection  93 . Further, at the drawn position of the third tray  30 C, the elastic deformation in the rear direction of the elastic portion  134 C of each of the engaging sections  134  is in a state of being returned in the front direction to a small extent, and the projecting portion  116 D does not make contact with the rear surface  90 B of the first supporting plate  90  in the engagement. Therefore, any vibration which would be otherwise occurred by the engagement hardly occurs. In addition to this, the moving speed of the projecting portion  116 D of each of the engaging sections  116  in the front/rear direction  8  is small due to the presence of the upwardly inclined surface  93 A and the downwardly inclined surface  93 B of each of the projections  93 , which in turn causes the user to hardly feel any click feeling. 
     Further, since the elastic deformation of the elastic portion  134 C of each of the engaging sections  134  is in the state of being returned in the front direction by a small extent, the projecting portion  116 D of each of the engaging sections  116  is in a state of being urged toward the upwardly inclined surface  93 A of one of the projections  93 . This urging force is converted by the inclination of the upwardly inclined surface  93 A to a force urging the second tray  30 B upwardly. With this, the second tray  30 B is urged upwardly in a state that the contact surface  102 A of each of the projections  102  of the first tray  30 A makes contact, in the up/down direction  7 , with the upper contact surface  117 A of one of the extended portions  117  of the second tray  30 B. Accordingly, this suppresses any movement in the up/down direction  7  (unsteadiness, rattling) of the second tray  30 B. 
     Since the upward movement of the second supporting plate  111  is regulated, in a case that the third tray  30 C is moved further upwardly from the third state, a rearward force is applied by each of the projections  112  to the upwardly inclined surface  134 B of one of the engaging sections  134  of the third supporting plate  131 . The engaging sections  134  are formed such the force elastically deforming the engaging sections  134  rearwardly is weaker than this force applied to the upwardly inclined surface  134 B. Accordingly, each of the engaging sections  134  is elastically deformed to thereby allow the upwardly inclined surface  134 B to move rearwardly. With this, the contact between the lower surface  112 B of each of the projections  112  and the upwardly inclined surface  134 B of one of the engaging sections  134  is released, and thus the third tray  30 C is allowed to move further upwardly. Then, the state of the third tray  30 C reaches a fourth state as depicted in  FIG. 14 . 
     &lt;Fourth State&gt; 
     In the fourth state, the second tray  30 B is at the drawn position with respect to the first tray  30 A. Further, in the fourth state, the third tray  30 C is located at a drawn position with respect to the second tray  30 B (an example of a fourth position; hereinafter referred to simply as the “drawn position of the third tray  30 C). 
     At the drawn position of the third tray  30 C, the contact surface  113 A of each of the projections  113  in the second supporting plate  111  of the second tray  30 B makes contact, in the up/down direction  7 , with the contact surface  132 A of one of the projections  132  in the third supporting surface  131  of the third tray  30 C. With this, upward movement of the third tray  30 C up to a position above the drawn position of the third tray  30 C with respect to the second tray  30 B is regulated. Also at the drawn position of the third tray  30 C, the third supporting plate  131  is overlapped with the second supporting plate  111  in the front/rear direction  8 , in a state that the third supporting plate  131  is located behind (located on the rear side of) the second supporting plate  111 , with an overlapping area smaller than that in the case that the third tray  30 C is located at the third position. 
     Further, at the drawn position of the third tray  30 C with respect to the second tray  30 B, the upper surface  112 A of each of the projections  112  in the second supporting plate  111  of the second tray  30 B makes contact, in the up/down direction  7 , with the downwardly inclined surface  134 A in one of the engaging sections  134  in the third supporting plate  131  of the third tray  30 C, and thus the engaging sections  134  engage with the projections  112  (see  FIG. 15C ). With this, in a state that the user is not pressing the third tray  30 C downwardly so as to store the third tray  30 C in the first tray  30 A, downward movement of the third tray  30 C to a position below the drawn position of the third tray  30 C with respect to the second tray  30 B is prevented. 
     The upper surface  112 A and the lower surface  112 B of each of the projections  112  are expanding along the front/rear direction  8  and the left/right direction  9  but are not inclined in the up/down direction  7 . Therefore, in a process (operation) in which the third tray  30 C is being moved upwardly and when the engaging sections  134  are engaging with the projections  112 , the projecting portion  134 D of each of the engaging sections  134  is moved rabidly rearwardly, and then climbs over the projection  112 , and then is moved rapidly frontwardly. Further, the elastic deformation in the rear direction of the elastic portion  134 C of each of the engaging sections  134  is in a state of being fully returned in the front direction, which in turn causes the user to feel a strong (large) click feeling. 
     &lt;Storing Operation&gt; 
     In a case that a downward force is applied to the operating section  136  of the third tray  30 C in the tray body  30  in the fourth state, at first, the engagement of the engaging sections  116  of the second tray  30 B with respect to the projections  93  in the first supporting plate  90  of the first tray  30 A is released. During this process, the force applied to the downwardly inclined surface  116 A of each of the engaging sections  116  by the upwardly inclined surface  93 A of one of the projections  93 , the elastic portion  116 C of each of the engaging sections  116  is elastically deformed such that the projecting portion  116 D of each of the engaging sections  116  is moved rearwardly. After that, the projecting portion  116 D of each of the engaging sections  116  climbs over one of the projections  93 , thereby allowing the elastic portion  116 C to be elastically returned (restored). This is caused because the engaging force of the engaging sections  116  of the second tray  30 B with respect to the projections  93  in the first supporting plate  90  of the first tray  30 A is weaker than the engaging force of the engaging sections  134  in the third supporting plate  131  of the third tray  30 C with respect to the projections  112  of the second tray  30 B. With this, the second tray  30 B is moved downwardly. Then, the state of the tray body  30  is changed to a state that the second tray  30 B is located at the stored position and the third tray  30 C is located at the drawn position. 
     In a case that the downward force is further applied to the operating section  136  of the third tray  30 C in the tray body  30  in this state, the engagement of the engaging sections  134  of the third tray  30 C with respect to the projections  112  of the second tray  30 B is released. During this process, the force applied to the downwardly inclined surface  134 A of each of the engaging sections  134  by the upper surface  112 A of one of the projections  112 , the elastic portion  134 C of each of the engaging sections  134  is elastically deformed such that the projecting portion  134 D of each of the engaging sections  134  is moved rearwardly. After that, the projecting portion  134 D of each of the engaging sections  134  climbs over one of the projections  112 , thereby allowing the elastic portion  134 C to be elastically returned. With this, the third tray  30 C is moved downwardly. Then, the third tray  30 C is moved up to a third contact position with respect to the first tray  30 A. At the third contact position, the upwardly inclined surface  95 A of each of the projections  95  in the first supporting plate  90  makes contact, in the up/down direction  7 , with the downwardly inclined surface  133 A of one of the engaging sections  133  in the third supporting plate  131 . 
     In a case that the third tray  30 C is further moved downwardly from this position, a force outwardly in the left/right direction  9  is applied to the downwardly inclined surface  133 A of each of the engaging sections  133  in the third supporting plate  131 , by one of the projections  95 . In a case that a force stronger than the force elastically deforming the engaging sections  133  outwardly in the left/right direction  9  is applied to the operating section  136 , the engaging sections  133  are thereby elastically deformed so as to move the downwardly inclined surfaces  133 A outwardly in the left/right direction  9 . With this, the projecting portion  133 D of each of the engaging sections  133  is guided by the upwardly inclined surface  95 A of one of the projections  95 , and the elastic portion  133 C is elastically deformed such that the projecting portion  133 D is moved outwardly in the left/right direction  9 . Afterwards, when the projecting portion  133 D climbs over a ridge defined between the upwardly inclined surface  95 A and the downward inclined surface  95 B, the projecting portion  133 D is guided by the downwardly inclined surface  95 B, and the elastic portion  133 C is elastically deformed such that the projecting portion  133 D is moved inwardly in the left/right direction  9 . With this, the third tray  30 C is moved downwardly, and the state of the third tray  30 C is returned to the first state. 
     Effects of Embodiment 
     As described above, in a case that the third tray  30 C is moved upwardly, the third tray  30 C is moved to the contact position with respect to the second tray  30 B, and the engaging sections  134  of the third tray  30 C make contact, in the up direction, with the projections  112  of the second tray  30 B. In a case that the third tray  30 C is moved further upwardly, the second tray  30 B and the third tray  30 C are integrally moved (the second tray  30 B is moved together with the third tray  30 C) upwardly in a state that the engaging sections  134  are making contact with the projections  112  of the second tray  30 B. In a case that the second tray  30 B is moved up to the drawn position of the second tray  30 B, the engaging sections  116  of the second tray  30 B engage with the projections  93  of the first tray  30 A. Further, in a case that the third tray  30 C is moved up to the drawn position of the third tray  30 C, the engaging sections  134  of the third tray  30 C engage with the projections  112  of the second tray  30 B. In such a manner, in a state that the second tray  30 B is moved up to the drawn position of the second tray  30 B and that the third tray  30 C is moved up to the drawn position of the third tray  30 C, the first tray  30 A, the second tray  30 B and the third tray  30 C engage with one another. 
     Before the engaging sections  134  of the third tray  30 C engage with the projections  112  of the second tray  30 B, the engaging sections  116  of the second tray  30 B engage with the projections  93  of the first tray  30 A. Accordingly, it is possible to suppress such a situation that the sheet tray is used only the third tray  30 C is drawn. 
     By moving the third tray  30 C from the contact position with respect to the second tray  30 B toward the drawn position of the third tray  30 C in the state that the engaging sections  116  of the second tray  30 B engage with the projections  93  of the first tray  30 A, the engaging sections  134  of the third tray  30 C are thereby elastically deformed so as to release the contact with respect to the projections  112  of the second tray  30 B, and the third tray  30 C is easily moved to the drawn position of the third tray  30 C. 
     The click feeling perceived by the user with respect to the engagement of the engaging sections  116  of the second tray  30 B is made to be small. Accordingly, when the user perceives a large click feeling, namely, when the engaging sections  134  of the third tray  30 C engage with the projections  112  of the second tray  30 B, the state is achieved wherein the engaging sections  116  and the engaging sections  134  are both in the engaged states thereof, respectively. Accordingly, it is possible to easily grasp the state that the second tray  30 B is located at the drawn position of the second tray  30 B and that the third tray  30 C is located at the drawn position of the third tray  30 C, namely the state that the second tray  30 B and the third tray  30 C are both in a fully drawn state thereof. 
     Further, the second tray  30 B receives the force in the up direction, due to the urging force brought about by each of the engaging sections  116  with respect to the upwardly inclined surface  93 A of one of the projections  93 . Namely, the second tray  30 B at the drawn position of the second tray  30 B receives the force in the up direction in a state that the movement of the second tray  30 B in the up direction is restricted (regulated). Accordingly, the movement of the second tray  30 B in both directions in the up/down direction  7  is suppressed. 
     The drawing direction for each of the second and third trays  30 B and  30 C is the up direction. Accordingly, in a case that the movements of the second and third trays  30 B and  30 C are stopped (aborted) in a state that the second tray  30 B has not moved up to the drawn position of the second tray  30 B and that the third tray  30 C has not moved up to the drawn position of the third tray  30 C, the second and the third trays  30 B and  30 C easily return to the stored positions thereof, respectively, due to the gravity. Accordingly, the user can easily grasp the state that all the trays are completely drawn. 
     The third tray  30 C is provided with the engaging sections  133  configured to engage with the first tray  30 A under a condition that the second tray  30 B is located at the stored position of the second tray  30 B and that the third tray  30 C is located at the stored position of the third tray  30 C. Accordingly, the MP tray  13  is maintained in the state that the second tray  30 B and the third tray  30 C are both at the stored positions, respectively. 
     The rear surface  111 B of the second supporting plate  111  of the second tray  30 B and the rear surface  131 B of the third supporting plate  131  of the third tray  30 C are covered (hidden) by the rear cover  101 . Accordingly, the outer appearance of the MP tray  13  can be improved. Further, the second and third trays  30 B and  30 C can be protected by the rear cover  101 . 
     In the state that both of the second tray  30 B and the third tray  30 C are located at the stored positions thereof, respectively, the second and third trays  30 B and  30 C are in a state of being covered (hidden) by the first tray  30 A. Accordingly, in this state, the outer appearance of the MP tray  13  can be improved. Further, the MP tray  13  can be made compact. 
     MODIFICATIONS 
     In the above-described embodiment, the engaging sections  116  are formed integrally with the second supporting plate  111  of the second tray  30 B, and the second supporting plate  111  is formed of a resin. Accordingly, the elastic deformation of the engaging sections  116  is elastic deformation of the resin forming the engaging sections  116 . In contrast to this, for example, it is allowable that the engaging sections  116  are configured to be movable relative to the second supporting plate  111  such that the downwardly inclined surface  116 A of each of the engaging sections  116  is movable in the front/rear direction  8 , and that each of the engaging sections  116  is urged by an elastic member, such as a spring, in a direction of allowing the downwardly inclined surface  116 A of each of the engaging sections  116  to make contact with the downwardly inclined surface  93 B of one of the projections  93 . This is similarly applicable also to the engaging sections  134  and  133 . 
     Further, in the engagements regarding the engaging sections  116 ,  133  and  134 , the engaging sections  116 ,  133  and  134  are each an elastically deformable member, and the projections  93 ,  95  and  112  each are not an elastically deformable member. However, it is allowable to adopt a configuration wherein the engaging sections  116 ,  133  and  134  each are not an elastically deformable member, and the projections  93 ,  95  and  112  are each an elastically deformable member. Furthermore, it is also allowable to adopt a configuration wherein both of the engaging sections  116 ,  133  and  134  and the projections  93 ,  95  and  112  are elastically deformable. 
     Moreover, provided that the engaging sections  116 ,  133  and  134  are engageable with the projections  93 ,  95  and  112 , respectively, the direction in which the engaging sections  116 ,  133  and  134  are elastically deformed and the direction in which the projections  93 ,  95  and  112  are projected can be changed in any way. Further, the direction in which other projection(s) regarding the engagement are projected can be changed in any way, as well.