Patent Publication Number: US-9889998-B2

Title: Recording apparatus with movable feed roller

Description:
BACKGROUND 
     1. Technical Field 
     The present invention relates to a recording apparatus provided with a tray which stores a recording medium, a feed roller which feeds the recording medium from the tray, and a roller support member which supports the feed roller and lifts and lowers the feed roller in relation to the tray. 
     2. Related Art 
     In the recording apparatus which is represented by a facsimile, a printer, or the like, a detachable paper feed cassette in relation to the apparatus main body is widely used in the related art. There are various names, such as “cassette” and “tray”, for a detachable paper storage implement which stores paper in the recording apparatus, and in the present specification, either term will be used according to the situation. 
     A configuration is well known in which a paper feed roller is provided above the paper feed cassette, the paper feed roller is supported by an arm (a support member), and the paper feed roller is lifted and lowered in relation to the recording medium which is stored in the paper feed cassette. Furthermore, a configuration is well known in which a plurality of paper feed cassettes are provided, and a paper feeding operation from any of the paper feed cassettes is selectively performed by one paper feed roller. 
     Incidentally, in a configuration in which the paper feed roller is supported by an arm, a configuration which takes into account the arm coming into contact with the paper feed cassette during the insertion and removal of the paper feed cassette becomes necessary. 
     JP-A-2006-273565 discloses a configuration in which a cam is provided on the paper feed cassette side, a cam follower is provided on a paper feed unit (an arm) side, and through the engagement of the cam and the cam follower, the paper feed roller is lifted and lowered during the insertion and removal of the paper feed cassette. 
     As described in JP-A-2006-273565, in the configuration in which the paper feed unit (the arm) is lifted and lowered by the paper feed cassette, there is a case in which a large operational force becomes necessary depending on the force which the paper feed cassette receives from the paper feed unit (the arm). For example, when the user inserts the paper feed cassette, the user perceives a large resistance force, and operational comfort of the user may be reduced. 
     It is possible to adjust the operational force when lifting and lowering the paper feed unit (the arm) using the paper feed cassette in the configuration described in JP-A-2006-273565 by changing the engagement position between the paper feed cassette and the paper feed unit (the arm); however, since the paper feed cassette in the configuration described in JP-A-2006-273565 is configured to directly push the paper feed unit (the arm) upward, there is a problem in that freedom in adjustment may not be secured due to space concerns. 
     SUMMARY 
     An advantage of some aspects of the invention is to provide a recording apparatus which takes usability into account when inserting and removing a tray which stores paper. 
     According to an aspect of the invention, a recording apparatus includes a recording unit which performs recording on a recording medium, a tray which stores the recording medium, a tray storage portion which stores the tray, a feed roller which feeds the recording medium out from the tray, and a roller support member which supports the feed roller and causes the feed roller to be lifted and lowered in relation to the tray by changing posture, in which a cam shaft capable of rotating is provided in the tray storage portion, in which the cam shaft is provided with a first engaging portion which engages with the tray and a second engaging portion which engages with the roller support member, and in which the roller support member is configured to change posture due to the tray causing the cam shaft to rotate. 
     According to this aspect, the cam shaft which is capable of rotating is provided in the tray storage portion which stores the tray, and the cam shaft is provided with the first engaging portion which engages with the tray, and the second engaging portion which engages with the roller support member which supports the feed roller. Since the roller support member is configured to change posture due to the tray causing the cam shaft to rotate, it is possible to easily adjust the operational force when changing the posture of the roller support member using the tray by adjusting the engagement between the first engaging portion and the tray and the engagement between the second engaging portion and the roller support member. In other words, it is possible to secure freedom in the adjustment. 
     In the recording apparatus, the roller support member may be configured to be provided to be capable of rocking centered on a rocking shaft and to cause the feed roller to be lifted or lowered in relation to the tray by rocking, and the cam shaft may be a separate member from the rocking shaft. 
     According to this aspect, since the cam shaft is a separate member from the rocking shaft, it is possible to secure a greater degree of freedom in the setting of the engagement position between the first engaging portion and the tray, and the engagement position between the second engaging portion and the roller support member, and by extension, it is possible to provide a recording apparatus which further takes usability into account. 
     In the recording apparatus, the cam shaft may be positioned on an insertion direction side of the tray in relation to the rocking shaft in the insertion-removal direction of the tray in relation to the tray storage portion. 
     According to this aspect, since the cam shaft is positioned on an insertion direction side of the tray in relation to the rocking shaft in the insertion-removal direction of the tray in relation to the tray storage portion, it is possible to separate the engagement position of the roller support member and the second engaging portion in the insertion direction of the tray from the rocking shaft, and by extension, it is possible to push the roller support member upward with a smaller operational force. Detailed description will be given below. 
     In the recording apparatus, a distance from an engagement position between the tray and the first engaging portion to a rotational center of the cam shaft may be longer than a distance from an engagement position between the roller support member and the second engaging portion to the rotational center. 
     According to this aspect, since the distance from the engagement position between the tray and the first engaging portion to the rotational center of the cam shaft is longer than the distance from the engagement position between the roller support member and the second engaging portion to the rotational center, it is possible to push the roller support member upward with a smaller operational force using the principle of leverage. Detailed description will be given below. 
     In the recording apparatus, when the tray pushes the roller support member upward, a height direction displacement amount of the engagement position between the roller support member and the second engaging portion per predetermined rotational angle of the cam shaft may be greater than a height direction displacement amount of the engagement position between the tray and the first engaging portion. 
     According to this aspect, since when the tray pushes the roller support member upward, the height direction displacement amount of the engagement position between the roller support member and the second engaging portion per predetermined rotational angle of the cam shaft is greater than the height direction displacement amount of the engagement position between the tray and the first engaging portion, it is possible to increase the posture change amount of the roller support member in relation to the displacement amount of the tray. Detailed description will be given below. 
     In the recording apparatus, a plurality of the trays may be provided. 
     According to this aspect, in the configuration in which the plurality of trays are provided, it is possible to obtain the same effects as any of the aspects described above. 
     According to another aspect of the invention, a recording apparatus includes a recording unit which performs recording on a recording medium, a bottom level side tray which stores the recording medium, a top level side tray which is provided above the bottom level side tray and stores the recording medium, a tray storage portion which stores the bottom level side tray and the top level side tray, a feed roller which feeds the recording medium out from the top level side tray and the bottom level side tray, and a roller support member which supports the feed roller and causes the feed roller to be lifted and lowered in relation to the bottom level side tray and the top level side tray by changing posture, in which a cam shaft capable of rotating is provided in the tray storage portion, in which the cam shaft is provided with a first engaging portion which engages with either or both of the bottom level side tray and the top level side tray and a second engaging portion which engages with the roller support member, and in which the roller support member is configured to change posture due to either or both of the bottom level side tray and the top level side tray causing the cam shaft to rotate. 
     According to this aspect, the cam shaft which is capable of rotating is provided in the tray storage portion which stores the bottom level side tray and the top level side tray (hereinafter shortened to the “top and bottom trays”, as appropriate), and the cam shaft is provided with the first engaging portion which engages with either one of the top and bottom trays, and the second engaging portion which engages with the roller support member which supports the feed roller. Since the roller support member is configured to change posture due to either one of the top and bottom trays causing the cam shaft to rotate, it is possible to easily adjust the operational force when either or both of the top and bottom trays causes the posture of the roller support member to change by adjusting the engagement between the first engaging portion and either one of the top and bottom trays and the engagement between the second engaging portion and the roller support member. 
     In the recording apparatus, the first engaging portion may engage with the top level side tray, the cam shaft may be provided with a third engaging portion which engages with the bottom level side tray, and both the bottom level side tray and the top level side tray may be configured to cause the cam shaft to rotate. 
     According to this aspect, since both the bottom level side tray and the top level side tray are configured to cause the cam shaft to rotate, it is not necessary to provide a dedicated cam shaft for each of the trays, and it is possible to obtain a simplification and a cost reduction in the apparatus configuration. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements. 
         FIG. 1  is an external perspective view of a printer according to the invention. 
         FIG. 2  is an external perspective view of the printer according to the invention. 
         FIG. 3  is an enlarged partial view of an apparatus front surface of the printer according to the invention. 
         FIG. 4  is a perspective view of a bottom level side tray. 
         FIG. 5  is a perspective view of a top level side tray. 
         FIG. 6  is a lateral sectional diagram illustrating a paper transport path of the printer according to the invention. 
         FIG. 7  is a lateral sectional diagram illustrating a paper transport path of the printer according to the invention. 
         FIG. 8  is a perspective view of a holding unit which holds an intermediate position of a feed roller. 
         FIG. 9  is a perspective view of the holding unit, which holds the intermediate position of the feed roller, and the bottom level side tray. 
         FIG. 10  is a diagram illustrating a state change at cross section F-F of  FIG. 9 . 
         FIG. 11  is a perspective view illustrating a relationship between a cam shaft and the top level side tray. 
         FIG. 12  is a perspective view illustrating the relationship between the cam shaft and the top level side tray. 
         FIG. 13  is a perspective view illustrating the relationship between the cam shaft and the top level side tray. 
         FIG. 14  is a perspective view illustrating the relationship between the cam shaft and the top level side tray. 
         FIG. 15  is a diagram comparatively illustrating cross section A-A and cross section B-B of  FIG. 11 . 
         FIG. 16  is a diagram comparatively illustrating cross section A-A and cross section B-B of  FIG. 11 . 
         FIG. 17  is a diagram comparatively illustrating cross section A-A and cross section B-B of  FIG. 11 . 
         FIG. 18  is a diagram comparatively illustrating cross section A-A and cross section B-B of  FIG. 11 . 
         FIG. 19  is a diagram of the cam shaft as viewed from an axial direction. 
         FIG. 20  is a perspective view illustrating a cam shaft and a bottom level side tray according to a second embodiment. 
         FIG. 21  is a perspective view illustrating the cam shaft and the bottom level side tray according to the second embodiment. 
         FIG. 22  is a perspective view illustrating the cam shaft and the bottom level side tray according to the second embodiment. 
         FIG. 23  is a perspective view illustrating the cam shaft, the bottom level side tray, and a top level side tray according to the second embodiment. 
         FIG. 24  is a perspective view illustrating the cam shaft, the bottom level side tray, and a top level side tray according to the second embodiment. 
         FIG. 25  is a perspective view illustrating the cam shaft, the bottom level side tray, and a top level side tray according to the second embodiment. 
         FIG. 26  is a diagram comparatively illustrating arrow C and cross section D-D of  FIG. 20 . 
         FIG. 27  is a diagram comparatively illustrating arrow C and cross section D-D of  FIG. 20 . 
         FIG. 28  is a view from arrow C of  FIG. 20 . 
         FIG. 29  is a diagram comparatively illustrating arrow C and cross section E-E of  FIG. 20 . 
         FIG. 30  is a diagram comparatively illustrating arrow C, cross section E-E and cross section D-D of  FIG. 20 . 
         FIG. 31  is a diagram comparatively illustrating cross section E-E and cross section D-D of  FIG. 20 . 
         FIG. 32  is a perspective view of a leading end portion and a frame material of the top level side tray. 
         FIG. 33  is a sectional diagram of the leading end portion and the frame material of the top level side tray. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Hereinafter, description is given of an embodiment of the invention based on the drawings; however, the invention is not limited to the embodiments described hereinafter, may be modified in various ways within the scope of the invention described in claims, and hereinafter, an embodiment of the invention is described assuming that such modifications are included in the invention. 
       FIGS. 1 and 2  are external perspective views of an ink jet printer  1  (hereinafter referred to as a “printer”) which is an embodiment of a “recording apparatus” according to the invention,  FIG. 3  is an enlarged partial view of (a non-mounted state of the top and bottom trays) of an apparatus front surface of the printer  1 ,  FIG. 4  is a perspective view of a bottom level side tray  50 , and  FIG. 5  is a perspective view of a top level side tray  60 . 
       FIGS. 6 and 7  are lateral sectional diagrams illustrating the paper transport path of the printer  1 ,  FIG. 8  is a perspective view of a holding unit  39  which holds an intermediate position of a feed roller  10 , and  FIG. 9  is a perspective view of the holding unit  39  and the bottom level side tray  50 . 
       FIG. 10  is a diagram illustrating a state change at cross section F-F of  FIG. 9 ,  FIGS. 11 to 14  are perspective views illustrating a relationship between a cam shaft  45  and the top level side tray  60 ,  FIGS. 15 to 18  are diagrams comparatively illustrating cross section A-A and cross section B-B of  FIG. 11 , and  FIG. 19  is a diagram of the cam shaft  45  as viewed from an axial direction. 
       FIGS. 20 to 22  are perspective views illustrating a cam shaft  145  and a bottom level side tray  150  according to the second embodiment, and  FIGS. 23 to 25  are perspective views illustrating the cam shaft  145 , the bottom level side tray  150 , and a top level side tray  60  according to the second embodiment. 
       FIGS. 26 and 27  are diagrams comparatively illustrating arrow C and cross section D-D of  FIG. 20 ,  FIG. 28  is a view from arrow C of  FIG. 20 ,  FIG. 29  is a diagram comparatively illustrating arrow C and cross section E-E of  FIG. 20 ,  FIG. 30  is a diagram comparatively illustrating arrow C, cross section E-E and cross section D-D of  FIG. 20 , and  FIG. 31  is a diagram comparatively illustrating cross section E-E and cross section D-D of  FIG. 20 . 
       FIG. 32  is a perspective view of a leading end portion and a frame material  9  of the top level side tray  60 , and  FIG. 33  is a sectional diagram of the leading end portion and the frame material  9  of the top level side tray  60 . 
     In the X-Y-Z coordinate system illustrated in the drawings, an X direction indicates an apparatus width direction and a paper width direction, a Y direction indicates an apparatus depth direction and a paper transport direction, and a Z direction indicates a vertical direction and an apparatus height direction. In the drawings, the +Y direction side is the apparatus front surface side, and the −Y direction side is the apparatus rear surface side. 
     1. Overall Configuration of Printer 
     Hereinafter, description will be given of the overall configuration of the printer  1  with reference to  FIGS. 1 to 7 . The printer  1  is provided with a scanner unit  3  on a top portion of an apparatus main body  2  (a recording unit) which performs ink jet recording on recording paper, which is an example of a recording medium, that is, the printer  1  is configured as a multifunction printer which is provided with a scanner function in addition to an ink jet recording function. 
     The scanner unit  3  is provided to be capable of rotating relative to the apparatus main body  2 , and is capable of assuming a closed state ( FIG. 1 ), and an open state (not illustrated) by rotating. 
     In the scanner unit  3 , a cover  4  is a cover capable of opening and closing, and a document stand  3   a  ( FIGS. 6 and 7 ) of the scanner unit  3  is made visible by opening the cover  4 . 
     On the apparatus front surface, sign  5  is an operation panel which is formed by providing a power button, operation buttons which perform various print settings and recording execution, a display unit which performs preview display or the like of print setting content and a print image, and the like. 
     On the apparatus front surface, sign  59  is a cover capable of opening and closing which is provided on the bottom level side tray  50 , and in  FIG. 1 , a state in which the cover  59  is closed is illustrated, and in  FIG. 2 , a state in which the cover  59  is open is illustrated. The cover  59  is configured such that, by opening the cover  59 , the bottom level side tray  50 , the top level side tray  60 , and a output paper receiving tray  8  are exposed. 
     The output paper receiving tray  8  is provided to be capable of assuming a state of being stored in the apparatus main body  2  by a motor which is not illustrated, ( FIGS. 1 and 2 ), and a state of protruding to the front side of the apparatus main body  2  ( FIGS. 6 and 7 ), and by assuming the state of protruding to the front side of the apparatus main body  2 , is capable of receiving the recording paper which is subjected to recording and is output. 
     The bottom level side tray  50  and the top level side tray  60  which is provided above the bottom level side tray  50  are capable of storing a plurality of sheets of recording paper, and each is independently attached to the apparatus main body  2  in a detachable manner. Even in a state in which one side is in the non-mounted state, as long as the other side is mounted, it is possible to feed the recording paper out from the mounted tray (described later in detail). In  FIG. 3 , sign  36  is a bottom portion guide rail which guides the bottom level side tray  50  in the attachment and detachment direction and supports the bottom level side tray  50 , and sign  35  is a top portion guide rail which guides the top level side tray  60  in the attachment and detachment direction and supports the top level side tray  60 . In  FIG. 3 , sign  49  indicates a tray storage portion which is provided in the apparatus main body  2  and stores the bottom level side tray  50  and the top level side tray  60 . 
     In this manner, the bottom level side tray  50  and the top level side tray  60  are capable of being attached and detached independently in relation to the apparatus main body  2 , and in a recording apparatus which is provided with a plurality of levels of trays in which it is not necessary to pull out a tray of another side when paper is set in a tray of one side, it is possible to improve the task efficiency during a paper setting task. 
     Although described in detail later, in a state of being mounted to the apparatus main body  2 , the top level side tray  60  is provided so as to undergo sliding displacement between a withdrawn position ( FIG. 6 ) and an abutting position ( FIG. 7 ), and whichever position of the withdrawn position and the abutting position the top level side tray  60  is in, and, even if the top level side tray  60  is between the two positions, this is the “mounted state”. In a case in which the top level side tray  60  is positioned further to the front side than the withdrawn position (further to the right side than the position of  FIG. 6 ), the incomplete mounting state, that is, the “non-mounted state” of the top level side tray  60  is assumed. 
     A state in which the bottom level side tray  50  is completely pushed in to the abutting position ( FIGS. 6 and 7 ) is the “mounted state”, and other states are the “non-mounted state”. Hereinafter, a “top and bottom tray non-mounted state” refers to a state in which both the bottom level side tray  50  and the top level side tray  60  are removed from the apparatus main body  2 . 
     Next, on the top rear portion of the apparatus main body  2 , sign  6  is a manual insert cover  6  capable of opening and closing, and by opening the manual insert cover  6 , it is possible to perform manual insertion paper feeding of the recording paper which uses a manual insert tray  7  ( FIGS. 6 and 7 ). 
     Next, description will be given of the paper transport path of the printer  1  with reference to  FIGS. 6  and  7 . The printer  1  according to the present embodiment is provided with the bottom level side tray  50  and the top level side tray  60  on the apparatus base portion, and the recording paper is fed one sheet at a time from the bottom level side tray  50  or the top level side tray  60 . 
     The top level side tray  60  is provided to be capable of sliding (being displaced) between a feed-capable position ( FIG. 7 ) and a withdrawn position ( FIG. 6 ), and is configured to receive motive force of a motor (not illustrated) to be displaced between the feed-capable position ( FIG. 7 ) and the withdrawn position ( FIG. 6 ). 
     In  FIGS. 6 and 7 , the paper which is stored in the bottom level side tray  50  is indicated by sign P 1 , and the paper which is stored in the top level side tray  60  is indicated by sign P 2  (hereinafter, in a case in which the two are not particularly distinguished, the paper will be referred to as “paper P”). 
     The feed roller  10  (also referred to as a pickup roller) which is rotationally driven by a motor (not illustrated) is provided in a roller support member  11  (also referred to as a pickup arm or a rocking member) which rocks centered on a rotating shaft  12 , and in a state in which the top level side tray  60  slides to the frontmost side of the apparatus (the right direction in  FIGS. 6 and 7 : the pulling out direction side of the top level side tray  60 ), that is, when the top level side tray  60  is in the withdrawn position (the state of  FIG. 6 ), the topmost sheet of the paper P 1  is fed from the bottom level side tray  50  through the feed roller  10  coming into contact with the topmost sheet of the paper P 1  which is stored in the bottom level side tray  50 . 
     When the top level side tray  60  is in the abutting position in which the top level side tray  60  is slid to the rearmost side of the apparatus (the left direction in  FIGS. 6 and 7 : the mounting direction side of the top level side tray  60 , and the paper feed-out direction side), that is, in the feed-capable position of the top level side tray  60  (the state of  FIG. 7 ), the topmost sheet of the paper P 2  is fed out from the top level side tray  60  due to the feed roller  10  coming into contact with the topmost sheet of the paper P 2  which is stored in the top level side tray  60  and rotating. 
     Even in a case in which either one of the bottom level side tray  50  and the top level side tray  60  is not mounted, it is possible to feed the paper from the other side, and thus, freedom is secured in the paper feeding, and an improvement in the ease of handling of the apparatus is obtained. 
     In the present embodiment, as illustrated in  FIG. 8 , the rotating shaft  12  forms a rocking shaft of the roller support member  11 , and receives the motive force of a motor (not illustrated) to rotate, and thus, the rotating shaft  12  transmits the motive force from a transmission gear  13  to a transmission-target gear  15  via a gear train  14 . The transmission gear  13  is provided in a position corresponding to the center in the width direction (the X direction) of the top level side tray  60  and the bottom level side tray  50 , and the transmission-target gear  15  is provided integrally with the feed roller  10 . In the present embodiment, the feed roller  10  is provided on both sides to interpose the transmission-target gear  15 . 
     Next, returning to  FIGS. 6 and 7 , in the apparatus main body  2 , a separation inclined surface  16  is provided in a position which faces the leading ends of the bottom level side tray  50  and the top level side tray  60 , in a state in which the bottom level side tray  50  is mounted, a stopper  50   d  (refer to  FIG. 4 ) which is provided on the leading end of the bottom level side tray  50  enters deeper than the separation inclined surface  16  (the left side in  FIG. 6 ), and the leading end of the paper which is stored in the bottom level side tray  50  enters a state of being able to come into contact with the separation inclined surface  16 . 
     In the top level side tray  60 , in a state in which the top level side tray  60  is positioned at the feed-capable position (the abutting position:  FIG. 7 ), a stopper  60   c  which is provided on the leading end of the top level side tray  60  enters deeper than the separation inclined surface  16 , and the leading end of the paper which is stored in the top level side tray  60  enters a state of being able to come into contact with the separation inclined surface  16 . 
     The state described above is also illustrated in  FIG. 32 . In  FIG. 32 , sign  9  is the frame material, and as illustrated in  FIG. 33 , receiving portions  9   a  and  9   a  which receive stoppers  60   c  and  60   c  are provided on the frame material  9 . As illustrated in  FIG. 33 , in a state in which the top level side tray  60  is positioned at the feed-capable position, the top level side tray  60  (the stopper  60   c ) is not in contact with a base surface  9   b  of the receiving portion  9   a , and a gap is formed between the top level side tray  60  and the base surface  9   b.    
     This is due to the following reasons. In other words, in a case in which the top level side tray  60  (the stopper  60   c ) is in contact with the base surface  9   b  of the receiving portion  9   a , friction arises therebetween, and depending on the friction state, the set state (for example, the up-down direction position) of the top level side tray  60  changes, and the paper feeding performance of the final sheet (the single last sheet) may be negatively influenced. Therefore, as described above, by configuring the top level side tray  60  (the stopper  60   c ) not to come into contact with the base surface  9   b  of the receiving portion  9   a , it is possible to avoid the negative influence described above. In  FIG. 33 , sign  64  is a reinforcing frame which is shaped to extend in the paper width direction (the X direction). The reinforcing frame  64  is framed by bending a metal plate material so as to form a cross-sectional C-shape as illustrated, and suppresses vertical downward warping across the X direction of the top level side tray  60  which is formed of a resin material. 
     Next, returning to  FIGS. 6 and 7 , the paper P which is fed out from the bottom level side tray  50  or the top level side tray  60  is separated into the topmost sheet of the paper P to be fed and the next sheet onward of the paper P due to the leading end of the paper P proceeding downstream while abutting the separation inclined surface  16 . 
     An intermediate roller  17  which is rotationally driven by a motor (not illustrated) is provided ahead of the separation inclined surface  16  on the downstream side in the transport path, the paper P is curved and inverted by the intermediate roller  17  and heads toward the front side of the apparatus. Signs  19 ,  20 , and  21  are follower rollers, the paper P is nipped by at least the follower roller  19  and the intermediate roller  17 , or by the follower roller  20  and the intermediate roller  17 , and is fed to the downstream side. 
     A transport drive roller  24  which is rotationally driven by a motor (not illustrated), and a transport follower roller  25  which is in contact with the transport drive roller  24  to follow the rotation thereof are provided beyond the intermediate roller  17 , and the paper P is fed under a recording head  30  by the rollers  24  and  25 . 
     Next, the recording head  30  which ejects an ink is provided on a base portion of a carriage  29 , and the carriage  29  is driven to move reciprocally in a main scanning direction (the obverse-reverse direction of the paper surface in  FIGS. 6 and 7 ) by a motor (not illustrated). 
     A support member  28  which supports the paper P is provided in a position facing the recording head  30 , and the interval between the paper P and the recording head  30  is defined by the support member  28 . An output drive roller  31  which is rotationally driven by a motor (not illustrated), and an output follower roller  32  which is in contact with the output drive roller  31  to follow the rotation thereof are provided on the downstream side of the support member  28 . The paper which is subjected to recording by the recording head  30  is output toward the output paper receiving tray  8  described above by the rollers  31  and  32 . 
     In a case in which both surfaces of the paper P are subjected to recording, after the obverse surface of the paper P is subjected to recording by the recording head  30 , by causing the paper P to switch back, the paper P is caused to enter the feed path from the bottom side of the intermediate roller  17  and to be curved and inverted, and thus, it is possible to subject the reverse surface of the paper P to recording. 
     2. Outline of Paper Feed Unit 
     Hereinabove, description is given of the overall configuration of the printer  1 , and hereinafter, detailed description will be given of a paper feed unit which is provided with the feed roller  10 . 
     A base surface  50   a  of the bottom level side tray  50  is provided with an edge guide  52  ( FIGS. 6 and 7 ) capable of sliding in the paper feed-out direction, and the position of the rear end edge is restricted by the edge guide  52 . In the present specification, the paper feed-out direction from the bottom level side tray  50  or the top level side tray  60  is the left direction in  FIGS. 6 and 7 , that is, a direction heading toward the separation inclined surface  16 , and the paper length direction and the slide direction of the top level side tray  60  is the left-right direction (the Y direction) in  FIGS. 6 and 7 . The paper width direction is a direction which is parallel to the obverse-reverse direction (the X direction) of the paper surface in  FIGS. 6 and 7 , that is, which is parallel to the paper surface, and is perpendicular to the paper feed-out direction. 
     Edge guides  51 A and  51 B capable of sliding in the paper width direction are also provided on the bottom level side tray  50  ( FIG. 4 ), and the positions of the side edges of the paper are restricted by the edge guides  51 A and  51 B. In the present embodiment, the two edge guides  51 A and  51 B which restrict the side edges of the paper are configured to be capable of being displaced simultaneously so as to be positioned symmetrically centered on the center position in the paper width direction. In other words, the printer  1  according to the present embodiment treats the center position in the paper width direction as a feed reference position (the same applies to the top level side tray  60 ). 
     A high friction material  53  is disposed in the vicinity of a location corresponding to a position of contact between the feed roller  10  and the paper P 1  on the base surface  50   a  of the bottom level side tray  50 , and the stack of paper is held by the high friction material  53  so that the whole paper stack is not fed to the downstream side during the paper feeding by the feed roller  10 . 
     The stopper  50   d  which restricts the position of the leading end of the paper is provided on the paper leading end side (the left side in  FIG. 4 ) in the bottom level side tray  50 , and due to the stopper  50   d , the bottom level side tray  50  is configured such that the paper does not leave the confines of the bottom level side tray  50  when the paper is set in the bottom level side tray  50 . In a case in which the bottom level side tray  50  is mounted to the apparatus main body  2  as described above, the stopper  50   d  enters deeper into the apparatus than the separation inclined surface  16  and does not come into contact with the paper which is fed. In other words, the stopper  50   d  does not impede the feeding of the paper during the paper feeding. 
     Meanwhile, in the same manner as with the bottom level side tray  50 , as illustrated in  FIG. 5 , a base surface  60   a  of the top level side tray  60  is provided with an edge guide  62  capable of sliding in the paper length direction, edge guides  61 A and  61 B capable of sliding in the paper width direction, and the stoppers  60   c  and  60   c . A high friction material  63  is disposed in the vicinity of a location corresponding to the position of contact between the feed roller  10  and the paper P 2 . 
     The top level side tray  60  is provided to be capable of sliding in the paper feed-out direction as described above in a state of being mounted to the apparatus main body  2 . 
     A rack portion  60   b  is formed along the sliding direction of the top level side tray  60  on the top surface of the end portion of one side of the top level side tray  60 , a rack and pinion mechanism is configured by a pinion gear (not illustrated) meshing with the rack portion  60   b , and the top level side tray  60  is subjected to sliding displacement between the feed-capable position (the abutting position:  FIG. 7 ) and the withdrawn position ( FIG. 6 ) due to the pinion gear rotating through the drive force of a motor (not illustrated). 
     3. Intermediate Position Holding of Roller Support Member 
     Next, description will be given of intermediate position holding of the roller support member  11 . The printer  1  is provided with the holding unit  39  which holds the roller support member  11  in an intermediate position (described later,  FIGS. 8 and 9 ). In a state in which both the bottom level side tray  50  and the top level side tray  60  are removed from the apparatus main body  2  (hereinafter, referred to as a “top and bottom tray non-mounted state”), the feed roller  10  is held by the holding unit  39 . The position (hereinafter referred to as the “intermediate position”) at which the feed roller  10  is held is lower than the height position of the feed roller  10  when the feed roller  10  is in contact with the base surface  60   a  onto which the paper P 2  is placed in the top level side tray  60 , and is higher than the height position of the feed roller  10  when the feed roller  10  is in contact with the topmost sheet of the paper P 1  in a state in which the maximum number of sheets of the paper P 1  is stored in the bottom level side tray  50 . 
     The holding unit  39  is provided with a slider  43 , a rotating shaft  40 , a first lever  41 , and a second lever  42 . The slider  43  is provided to be capable of sliding in the mounting direction of the bottom level side tray  50  and in the opposite direction, and is provided to be capable of engaging with the bottom level side tray  50 , the rotating shaft  40  is capable of rotating, the first lever  41  is provided on the one end side of the rotating shaft  40  and engages with the roller support member  11 , and the second lever  42  is provided on the other end side of the rotating shaft  40  and is capable of engaging with the slider  43 . The holding unit  39  is provided with a coil spring  44  as a shaft biasing unit which biases the rotating shaft  40  in a direction in which the first lever  41  pushes the roller support member  11  upward. 
     The slider  43 , the rotating shaft  40 , and the rotating shaft  12  are provided on a frame (not illustrated). 
     The coil spring  44  exerts a biasing force between the frame and the second lever  42  biases the roller support member  11  (a lever engaging portion  11   c  of the roller support member  11 :  FIG. 10 ) via the second lever  42 , the rotating shaft  40 , and the first lever  41  in a direction in which the roller support member  11  is pushed upward. Therefore, in a case in which the slider  43  is in a state of not engaging with the bottom level side tray  50  (a pressing portion  50   e ), that is, when the bottom level side tray  50  is in the non-mounted state, the feed roller  10  is held in the intermediate position. At this time, the position (the intermediate position) of the feed roller  10  is a position slightly lower than the position of the feed roller  10  in the F-F- 1  sectional diagram of  FIG. 10 . 
     In this state, the second lever  42  pushes a second engaging portion  43   b  of the slider  43  in a tray pull-out direction, and thus, the slider  43  is positioned in the tray pull-out direction in the sliding range. 
     When the bottom level side tray  50  is mounted from the top and bottom tray non-mounted state, a first engaging portion  43   a  of the slider  43  is engaged with the pressing portion  50   e  of the leading end of the bottom level side tray  50 , and the slider  43  is pushed in the tray mounting direction. Accordingly, the second engaging portion  43   b  of the slider  43  causes the rotating shaft  40  to rotate via the second lever  42  against the biasing force of the coil spring  44 , the leading end of the first lever  41  drops, and the roller support member  11  becomes capable of rocking downward. In other words, the holding of the feed roller  10  in the intermediate position is released, the feed roller  10  drops under its own weight, and it is possible to come into contact with the paper P 1  which is stored in the bottom level side tray  50  (the cross section F-F- 2  of  FIG. 10 ). 
     In the intermediate position, the roller support member  11  is in a position which interferes with the top level side tray  60 ; however, when the top level side tray  60  is mounted, the roller support member  11  is pushed upward by a cam mechanism (described later), and the top level side tray  60  does not collide with the roller support member  11 . 
     In the mounted state of the top level side tray  60 , as illustrated in the cross section F-F- 1  of  FIG. 10 , the lever engaging portion  11   c  of the roller support member  11  and the first lever  41  assume a separated state, and the first lever  41  does not impede the rocking operation of the roller support member  11  during the paper feeding from the top level side tray  60 . 
     4. Posture Switching of Roller Support Member by Top Level Side Tray 
     Next, description will be given of the posture switching of the roller support member  11  by the top level side tray  60 . 
     As illustrated in  FIGS. 8, 9, and 11  onward, the cam shaft  45  is provided in the tray storage portion  49  ( FIGS. 3, 6, and 7 ) which stores the top and bottom trays. The cam shaft  45  extends in the same direction as the extending direction (the X direction) of the rotating shaft  12 , a cam follower portion  46  which forms a “first engaging portion” is provided on one end side of the cam shaft  45 , and a cam portion  47  which forms a “second engaging portion” is provided on the other end side of the cam shaft  45 . 
     In the same manner as the rotating shaft  40 , the rotating shaft  12 , and the like described above, the cam shaft  45  is provided on a frame (not illustrated). 
     The cam follower portion  46  which is provided on the cam shaft  45  is provided in a position to be capable of engaging with a leading end portion  60   d  of the top level side tray  60 . The leading end portion  60   d  of the top level side tray  60  is the leading end portion of one side among both sides (both sides in the X direction, or both side end portions) of the top level side tray  60 . 
     The cam portion  47  which is provided on the cam shaft  45  is in a position capable of engaging with a lever engaging portion  11   d  which is formed on the inside of a hold which is formed in the side surface of the roller support member  11 . In other words, the cam portion  47  is inserted into the hole which forms the lever engaging portion  11   d.    
       FIG. 11  and  FIG. 15  which corresponds to  FIG. 11  illustrate a state in which the bottom level side tray  50  is mounted and the top level side tray  60  is in the withdrawn position. In this state, as illustrated in  FIG. 15 , although the cam follower portion  46  is in a state in which contact with the leading end portion  60   d  of the top level side tray  60  is started, the cam portion  47  is not pushing the roller support member  11  (the lever engaging portion  11   d ) upward, and the roller support member  11  is in a posture which interferes with the top level side tray  60 . 
     When the top level side tray  60  moves from this state toward the feed-capable position (toward the right direction in  FIG. 15 ), as illustrated in  FIG. 12  and  FIG. 16  which is a sectional diagram corresponding to  FIG. 12 , the cam follower portion  46  is pushed up onto the leading end portion  60   d  of the top level side tray  60  and assumes a state of being in contact with the top surface of the top level side tray  60 . In this process, the cam shaft  45  rotates, the cam portion  47  pushes the roller support member  11  (the lever engaging portion  11   d ) upward, and the roller support member  11  withdraws upward from a proceeding-withdrawing region of the top level side tray  60 . 
     In this state, the roller support member  11  is apt to drop downward under its own weight; however, the actions of the cam portion  47 , the cam shaft  45 , and the cam follower portion  46  cause a posture in which the roller support member  11  is rocked upward to be maintained. In this posture, the feed roller  10  which is supported by the roller support member  11  is in a position in which the feed roller  10  does not come into contact with the paper P 2  which is stored in the top level side tray  60  (a position in which there is no contact even if the maximum number of sheets are present). 
     Here, as illustrated in  FIG. 13 , a recessed portion  60   e  and an inclined surface  60   f  are formed in the top level side tray  60 . When the top level side tray  60  moves further from the position illustrated in  FIGS. 12 and 16  toward the feed-capable position, as illustrated in  FIG. 13  and  FIG. 17  which is a sectional diagram corresponding to  FIG. 13 , the cam follower portion  46  is guided from the top surface of the top level side tray  60  to the inclined surface  60   f  and enters the recessed portion  60   e . Due to the cam follower portion  46  entering the recessed portion  60   e , the supporting of the roller support member  11  by the cam portion  47  is released, and it becomes possible for the roller support member  11  to rock downward. In other words, the feed roller  10  which is supported by the roller support member  11  becomes capable of coming into contact with the paper P 2  which is stored in the top level side tray  60 , and it becomes possible to feed paper out from the top level side tray  60 . 
     Next, in the process in which the top level side tray  60  moves from the feed-capable position ( FIGS. 13 and 17 ) to the withdrawn position, as illustrated in  FIG. 14  and  FIG. 18  which is a sectional diagram corresponding to  FIG. 14 , the cam follower portion  46  is guided onto the top surface of the top level side tray  60  by the inclined surface  60   f . Accordingly, the roller support member  11  is pushed upward again, and the feed roller  10  separates from the paper P 2  which is stored in the top level side tray  60 . 
     Here, description will be given of the positional relationship between the cam follower portion  46  and the cam portion  47  which are formed on the cam shaft  45 , with reference to  FIG. 19 .  FIG. 19  illustrates the posture of the cam follower portion  46  and the cam portion  47  in the state illustrated in  FIGS. 11 and 15 . 
     In the present embodiment, when the top level side tray  60  pushes the roller support member  11  upward via the cam follower portion  46 , the cam shaft  45  and the cam portion  47 , a height direction displacement amount Y 2  of an engagement position T 2  between the roller support member  11  and the cam portion  47  (the second engaging portion) per predetermined rotational angle α of the cam shaft  45  is set to be greater than a height direction displacement amount Y 1  of an engagement position T 1  between the top level side tray  60  and the cam follower portion  46  (the first engaging portion). 
     The setting described above may be changed by adjusting the phase between the cam follower portion  46  and the cam portion  47  in the cam shaft  45  in  FIG. 19 . As described above, by setting the height direction displacement amount Y 2  of the engagement position T 2  between the roller support member  11  and the cam portion  47  (the second engaging portion) per the predetermined rotational angle α of the cam shaft  45  to be greater than the height direction displacement amount Y 1  of the engagement position T 1  between the top level side tray  60  and the cam follower portion  46  (the first engaging portion), it is possible to increase the vertical direction displacement amount of the roller support member  11  in relation to the horizontal direction displacement amount of the top level side tray  60 . 
     As a result, it is possible to swiftly push the roller support member  11  upward, that is, it is possible to swiftly cause the feed roller  10  to withdraw upward. Accordingly, it is possible to suppress the displacement of the top level side tray  60  while maintaining the state in which the feed roller  10  is in contact with the paper which is stored in the top level side tray  60 . 
     As a result, it is possible to avoid or suppress a problem in which, when the top level side tray  60  is displaced, the feed roller  10  pulls the paper which is stored in the top level side tray  60  out from within the tray. 
     As another embodiment, a distance L 1  from the engagement position T 1  (the engagement position between the top level side tray  60  and the cam follower portion  46 ) in  FIG. 19  to a rotational center C 1  of the cam shaft  45  is set to be longer than a distance L 2  from the engagement position T 2  (the engagement position between the roller support member  11  and the cam portion  47 ) to the rotational center C 1  of the cam shaft  45 , and thus, it is possible to obtain the following effects. 
     In other words, in  FIG. 19 , since the engagement position T 1  is a force application point, the cam shaft  45  is a fulcrum, and the engagement position T 2  is a point of action, due to the distance L 1  being longer than the distance L 2 , it is possible to push the roller support member  11  upward with a smaller operational force using the principle of leverage. 
     A summary of the configuration of the invention described is given hereinafter. In other words, the printer  1  according to the present embodiment is provided with the recording head  30 , the top level side tray  60 , the tray storage portion  49 , the feed roller  10 , and the roller support member  11 . The recording head  30  forms a recording unit which performs recording on paper, which is an example of a recording medium, the top level side tray  60  stores the paper, the tray storage portion  49  stores the top level side tray  60 , the feed roller  10  feeds the paper out from the top level side tray  60 , and the roller support member  11  supports the feed roller  10  and causes the feed roller  10  to proceed or withdraw in relation to the top level side tray  60  through a change in posture. The cam shaft  45  which is capable of rotating is provided in the tray storage portion  49 , and the cam shaft  45  is provided with the cam follower portion  46  and the cam portion  47 . The cam follower portion  46  serves as the first engaging portion which engages with the top level side tray  60 , the cam portion  47  serves as the second engaging portion which engages with the roller support member  11 , and the roller support member  11  is configured to change posture due to the top level side tray  60  causing the cam shaft  45  to rotate. 
     According to the configuration described above, as described with reference to  FIG. 19 , by adjusting the engagement between the cam follower portion  46  and the top level side tray  60  and the engagement between the cam portion  47  and the roller support member  11 , it is possible to easily adjust the operational force when changing the posture of the roller support member  11  using the top level side tray  60 . 
     In the present embodiment, the roller support member  11  is configured to be provided to be capable of rocking centered on the rotating shaft  12  (the rocking shaft) and to cause the feed roller  10  to proceed or withdraw in relation to the top level side tray  60  by rocking, and the cam shaft  45  is a separate member from the rotating shaft  12 . Therefore, it is possible to secure a greater degree of freedom in the setting of the engagement position T 1  between the cam follower portion  46  and the top level side tray  60 , and the engagement position T 2  between the cam portion  47  and the roller support member  11 , and by extension, it is possible to provide a recording apparatus which further takes usability into account. 
     In the present embodiment, in the insertion-removal direction of the top level side tray  60  (the Y direction), the cam shaft  45  is positioned on the insertion direction side (the tray leading end side) of the top level side tray  60  in relation to the rotating shaft  12 . Therefore, it is possible to separate the engagement position T 2  ( FIG. 19 ) between the roller support member  11  and the cam portion  47  from the rotating shaft  12  in the tray insertion direction (the right direction in  FIG. 19 ), and by extension, it is possible to push the roller support member  11  upward with a smaller operational force. In other words, since the roller support member  11  is provided to be capable of rocking centered on the rotating shaft  12 , it is possible to push the roller support member  11  upward with a smaller force by pushing the roller support member  11  upward at a further position from the rotating shaft  12 . 
     However, unlike in the present embodiment, the cam shaft  45  may be provided on the opposite side from the insertion direction side (the tray leading end side) of the top level side tray  60  in relation to the rotating shaft  12 . 
     The embodiment described above is configured such that the two trays, the bottom level side tray  50  and the top level side tray  60 , are provided, and of these, at least the top level side tray  60  causes the cam shaft  45  to rotate; however, a configuration may be adopted in which instead of the top level side tray  60 , the bottom level side tray  50  causes the cam shaft  45  to rotate. In this case, it is preferable that the top level side tray  60  is provided with a separate unit which causes the roller support member  11  to rock. 
     The embodiment described above is configured such that the two trays, the bottom level side tray  50  and the top level side tray  60 , are provided; however, the configuration is not limited thereto, and a configuration may be adopted in which only one tray is provided, or conversely, a greater number of trays may be provided, naturally. At this time, there may be one or a plurality of trays which cause the cam shaft  45  to rotate. 
     5. Second Embodiment 
     Hereinafter, description will be given of the second embodiment of the invention with reference to  FIG. 20  onward. 
     The second embodiment differs from the first embodiment in that the cam shaft  45  of the first embodiment described above is caused to rock by the bottom level side tray  50  in addition to the top level side tray  60 . In the second embodiment, the holding unit  39 , which is described with reference to the first embodiment, is not provided. 
     In  FIG. 20 , sign  145  is a cam shaft corresponding to the cam shaft  45  of the first embodiment. Sign  146  is a cam follower portion corresponding to the cam follower portion  46  of the first embodiment. Sign  147  is a cam follower portion corresponding to the cam portion  47  of the first embodiment. The functions of the cam shaft  145 , the cam follower portion  146 , and the cam portion  147  are the same as in the corresponding configuration already described in the first embodiment. 
     The second embodiment differs from the first embodiment in that the cam shaft  145  is provided with a second cam follower portion  148  which forms a “third engaging portion”. 
     The second cam follower portion  148  is provided in a position at which it is possible to engage with a leading end portion  150   a  of the bottom level side tray  150 . The leading end portion  150   a  of the bottom level side tray  150  is the leading end portion of one side among both sides (both sides in the X direction) of the bottom level side tray  150 . 
       FIG. 20  and  FIG. 26  which corresponds to  FIG. 20  illustrate a process in which the bottom level side tray  150  is mounted. In this state, although the second cam follower portion  148  is in a state in which the contact with the leading end portion  150   a  of the bottom level side tray  150  is started, the cam portion  147  is not pushing the roller support member  11  (the lever engaging portion  11   d ) upward. 
     When the bottom level side tray  150  moves from this state toward the mounted position (toward the right direction in  FIG. 26 ), as illustrated in  FIG. 21  and  FIG. 27  which is a sectional diagram corresponding to  FIG. 21 , the second cam follower portion  148  is pushed up onto the leading end portion  150   a  of the bottom level side tray  150  and assumes a state of being in contact with the top surfaces of the side walls of the bottom level side tray  150 . In this process, the cam shaft  145  rotates, the cam portion  147  pushes the roller support member  11  (the lever engaging portion  11   d ) upward, and the roller support member  11  withdraws upward from a proceeding-withdrawing region of the bottom level side tray  150 . 
     In this state, the roller support member  11  is apt to drop downward under its own weight; however, the actions of the cam portion  147 , the cam shaft  145 , and the second cam follower portion  148  cause a posture in which the roller support member  11  is rocked upward to be maintained. In this posture, the feed roller  10  which is supported by the roller support member  11  is in a position in which the feed roller  10  does not come into contact with the paper which is stored in the bottom level side tray  150  (a position in which there is no contact even if the maximum number of sheets are present). 
     Here, as illustrated in  FIG. 22 , a recessed portion  150   b  and an inclined surface  150   c  are formed in the top level side tray  60 . When the bottom level side tray  150  moves further from the position illustrated in  FIGS. 21 and 27  toward the mounted position, as illustrated in  FIG. 22  and  FIG. 28  which is a sectional diagram corresponding to  FIG. 22 , the second cam follower portion  148  is guided from the top surface of the side walls of the bottom level side tray  150  to the inclined surface  150   c  and enters the recessed portion  150   b . Due to the second cam follower portion  148  entering the recessed portion  150   b , the supporting of the roller support member  11  by the cam portion  147  is released, and it becomes possible for the roller support member  11  to rock downward. In other words, the feed roller  10  which is supported by the roller support member  11  becomes capable of coming into contact with the paper which is stored in the bottom level side tray  150 , and it becomes possible to feed paper out from the bottom level side tray  150 . 
     In the process of removing the bottom level side tray  150  from the mounted position ( FIGS. 22 and 28 ), although not depicted in the drawings, the second cam follower portion  148  is guided by the inclined surface  150   c  to the top surface of the side walls of the bottom level side tray  150 . Accordingly, the roller support member  11  is pushed upward again, and the feed roller  10  separates from the paper P 1  which is stored in the bottom level side tray  150 . 
     When the top level side tray  60  moves from the withdrawn position toward the feed-capable position in a state in which the bottom level side tray  150  is mounted, as illustrated in  FIGS. 23 and 29  which is a sectional diagram corresponding to  FIG. 23 , the leading end portion  60   d  of the top level side tray  60  starts coming into contact with the cam follower portion  146 . When the top level side tray  60  moves further toward the feed-capable position, as illustrated in  FIG. 24  and  FIG. 30  which is a sectional diagram corresponding to  FIG. 24 , the cam follower portion  146  is pushed up onto the leading end portion  60   d  of the top level side tray  60  and assumes a state of being in contact with the top surface of the top level side tray  60 . In this process, the cam shaft  145  rotates, the cam portion  147  further pushes the roller support member  11  (the lever engaging portion  11   d ) upward, and the roller support member  11  withdraws upward from the proceeding-withdrawing region of the top level side tray  60 . 
     In this state, the roller support member  11  is apt to drop downward under its own weight; however, the actions of the cam portion  147 , the cam shaft  145 , and the cam follower portion  146  cause a posture in which the roller support member  11  is rocked upward to be maintained. In this posture, the feed roller  10  which is supported by the roller support member  11  is in a position in which the feed roller  10  does not come into contact with the paper which is stored in the top level side tray  60  (a position in which there is no contact even if the maximum number of sheets are present). 
     Here, as illustrated in the first embodiment described above, the recessed portion  60   e  and the inclined surface  60   f  are formed in the top level side tray  60 . When the top level side tray  60  moves further from the position illustrated in  FIGS. 24 and 30  toward the feed-capable position, as illustrated in  FIG. 25  and  FIG. 31  which is a sectional diagram corresponding to  FIG. 25 , the cam follower portion  146  is guided from the top surface of the top level side tray  60  to the inclined surface  60   f  and enters the recessed portion  60   e . Due to the cam follower portion  146  entering the recessed portion  60   e , the supporting of the roller support member  11  by the cam portion  147  is released, and it becomes possible for the roller support member  11  to rock downward. In other words, the feed roller  10  which is supported by the roller support member  11  becomes capable of coming into contact with the paper which is stored in the top level side tray  60 , and it becomes possible to feed paper out from the top level side tray  60 . 
     In the process in which the top level side tray  60  moves from the feed-capable position ( FIGS. 25 and 31 ) to the withdrawn position, the cam follower portion  146  is guided onto the top surface of the top level side tray  60  by the inclined surface  60   f . Accordingly, the roller support member  11  is pushed upward again, and the feed roller  10  separates from the paper P 2  which is stored in the top level side tray  60 . 
     As described above, in the present embodiment, since both the bottom level side tray  150  and the top level side tray  60  are configured to cause the cam shaft  145  to rotate, it is not necessary to provide a dedicated cam shaft for each of the top and bottom trays, and it is possible to obtain a simplification and a cost reduction in the apparatus configuration. 
     The second embodiment described above is configured such that the two trays, the bottom level side tray  150  and the top level side tray  60 , are provided, and the cam shaft  145  is caused to rotate by these two trays; however, the configuration is not limited thereto, and a configuration may be adopted in which still more trays are provided, and each of the trays causes the cam shaft  145  to rotate, and a configuration may be adopted in which, of the trays, an arbitrary tray (singular or plural) causes the cam shaft  145  to rotate. 
     The respective cam portion ( 47 ,  147 ) and cam follower portion ( 46 ,  146 ,  148 ) of the first embodiment and the second embodiment are provided on only one side in the axial direction of the cam shaft ( 45 ,  145 ) in the present embodiment; however, the cam portion and the cam follower portion may additionally be provided on the other side, that is, may be provided as pairs symmetrically on the left and right. 
     The invention is not limited to the embodiments described above or the modification examples described as appropriate, and may be modified in various ways within the scope of the invention described in the claims, and the modifications should be construed as being included in the invention. 
     The entire disclosure of Japanese Patent Application No. 2015-206995, filed Oct. 21, 2015 is expressly incorporated by reference herein.