Patent Publication Number: US-8123421-B2

Title: Medium feeding device with roller cleaning member under sheet tray

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2007-169397, filed on Jun. 27, 2007, the entire contents of which are incorporated herein by reference. 
     TECHNICAL FIELD 
     One aspect of the present invention relates to an image recording apparatus capable of conveying a recording medium such as recording sheet placed on a tray and recording an image on the sheet in the course of conveying the sheet. Another aspect of the invention relates to a medium feeding device capable of feeding a recording medium. 
     BACKGROUND 
     A related-art image recording apparatus may include a roller which is brought into pressing contact with a recording sheet placed on a tray and the roller is driven in the press-contact state. Accordingly, the recording sheet is fed from the tray to a conveying path. Ink or toner is attached to the recording sheet in the course of conveying the recording sheet through the conveying path to form a desired image. As described above, since the roller is pivotally driven in the press-contact state, paper dust or dust on the recording sheet may adhere to the roller. The paper dust or the dust adhering to the roller may cause a jam or a feed failure of the recording sheet. JP-A-5-92641 discloses a cleaning sheet of a feeding roller of a printer for cleaning the roller. 
     The printer described in JP-A-5-92641 includes a cleaning sheet that can be freely attached to and detached from a tray. In the cleaning sheet, a hook and a sponge cleaning cloth are disposed on a base sheet. The cleaning sheet is fixed to the tray by the use of the hook. The tray is fitted into the printer body in a state where the cleaning sheet is fixed to the tray and no recording sheet is placed on the tray. Accordingly, the roller contacts with the cleaning cloth. When a sheet feed button is pushed in this state, the roller is rotationally driven and the surface of the roller is cleaned by the cleaning cloth. 
     However, in the printer of JP-A-5-92641, before the cleaning of the roller, the user is required to remove sheets such as recording sheets from the tray, attach the cleaning sheet to the tray, and fit the tray into the printer. Similarly, after the cleaning of the roller, the user is required to separate the cleaning sheet from the tray, return the removed sheets into the tray, and then fit the tray into the printer. In the printer, a user needs to perform such trouble operations before and after cleaning the roller. 
     In addition, it is necessary to prepare the cleaning sheet depending on the shape of the tray and the arrangement of the roller. Accordingly, the entire configuration of the printer is complicated, thereby increasing the cost of the printer. 
     SUMMARY 
     One aspect of the present invention is conceived in view of the above-mentioned circumstances. An object of one aspect of the invention is to provide an image recording apparatus and a medium feeding device that can clean a feeding member such as a roller with a simple configuration without troublesome operations of installing a cleaning member or separating and retaining the cleaning member. 
     According to a first aspect of the invention, there is provided an image recording apparatus comprising: a main body; a first tray attachable to and capable of being drawn out of the main body, the first tray allowing a sheet to be placed thereon; a first conveying path through which the sheet fed from the first tray is conveyed; a roller that is brought into pressing contact with the sheet placed on the first tray and configured to feed the sheet to the first conveying path; a recording unit configured to record an image on the sheet in a course of conveying the sheet; a frame configured to support the first tray from a downside; and a cleaning member disposed at the frame and configured to clean the roller, wherein the roller is movable relative to the cleaning member, the roller being movable between a first posture in which the roller is supported from the downside by the first tray in a state where the first tray is inserted into the main body and a second posture in which the roller is brought into pressing contact with the cleaning member by drawing out the first tray from the main body to a predetermined position. 
     According to a second aspect of the invention, there is provided a medium feeding device capable of feeding a recording medium placed on a first tray, the medium conveying device comprising: a frame having a first surface and allowing the first tray to be movable along the first surface, the first tray being attached to the medium feeding device at a first position of the first surface; a feeding member configured to feed the recording medium to a first conveying path when the first tray with the recording medium thereon is positioned at the first position, a cleaning member disposed at the first surface of the frame and configured to clean the feeding member when the cleaning member is uncovered by the first tray. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view illustrating an appearance of a multi function device according to an embodiment of the invention; 
         FIG. 2  is a longitudinal sectional view illustrating an inner structure of a printer unit; 
         FIG. 3  is an enlarged sectional view of a path switching section, where a frame is maintained in a horizontal posture; 
         FIG. 4  is a perspective view illustrating a sheet feed cassette, where a feed roller is supported from the downside by a sheet feed tray; 
         FIG. 5  is a perspective view illustrating a configuration of a sheet feed tray; 
         FIG. 6  is a perspective view illustrating a frame, where the sheet feed tray is inserted into a main body; 
         FIG. 7  is an enlarged sectional view illustrating an arm, where the sheet feed tray is inserted into the main body; 
         FIG. 8  is an enlarged sectional view illustrating the frame, where the sheet feed tray is drawn from the main body; 
         FIG. 9  is an enlarged sectional view illustrating the arm, where the sheet feed tray is drawn from the main body; and 
         FIGS. 10A and 10B  are diagrams schematically explaining a state where a cleaning member moves to the feed roller with the drawing of the sheet feed tray. 
     
    
    
     DESCRIPTION 
     Hereinafter, exemplary embodiments of the invention will be described with reference to the accompanying drawings. The embodiments of the invention are only examples of the invention and can be properly modified without departing from the scope of the invention. 
     At first, a configuration and an operation of a multi function device  10  as an example of an image recording apparatus according to an embodiment of the invention will be described. 
     &lt;Configuration of Multi Function Device  10 &gt; 
       FIG. 1  is a perspective view illustrating an appearance of a multi function device (MFD)  10  according to an embodiment of the invention.  FIG. 2  is a longitudinal sectional view illustrating an inner structure of a printer unit  11 . In  FIG. 2 , a part of a sheet feed tray  20  (see also  FIGS. 4 and 5 ) and a sheet discharge tray  21  (see also  FIG. 4 ) are omitted. 
     As shown in  FIG. 1 , the multi function device  10  includes a printer unit  11  and a scanner unit  12  and has a printing function, a scanning function, a copying function, and a facsimile function. An example of the image recording apparatus is embodied as the printer unit  11  of the multi function device  10  in this embodiment. Accordingly, the functions other than the printing function are arbitrary. In this embodiment, the printer unit  11  is an ink jet printer using ink to record an image. The printer unit  11  may be a laser printer using toner to record an image. 
     The multi function device  10  is connectable to an external information device (not shown) such as a computer. The multi function device  10  can receive print data including image data or document data transmitted from the external information device. The multi function device  10  can record an image on a recording sheet as an example of a recording medium on the basis of the print data. The multi function device  10  can also record an image on the printing sheet on the basis of the image data of a document read by the scanner unit  12 . The multi function device  10  may be connectable to a digital camera and may record an image on the recording sheet on the basis of the image data output from the digital camera. The multi function device  10  may support various storage media such as a memory card inserted thereto and records an image on the recording sheet on the basis of image data stored in the storage medium. 
     As shown in  FIG. 1 , the multi function device  10  has a substantially wide-and-thin rectangular parallelepiped shape having a horizontal width and an inner depth grater than the height thereof. The printer unit  11  has an opening  13  on a front surface  36  of a main body  35 . The opening  13  allows a user to take out the recording sheet on which an image is recorded and discharged in a space  135 . The space  135  is provided with a sheet feed cassette  70  (see  FIG. 4 ) storing the recording sheet. The sheet feed cassette  70  includes a sheet feed tray  20  and a sheet discharge tray  21  (see  FIG. 4 ). Recording sheets used to record an image are placed on the sheet feed tray  20 . The recording sheets having an image recorded thereon are discharged to the sheet discharge tray  21 . The sheet feed cassette  70  is omitted in  FIG. 1 . 
     A door  38  (see  FIG. 1 ) is disposed on the lower right side of the front surface  36  of the main body  35  so as to be freely opened and closed. A cartridge mounting section  66  is disposed inside the door  38 . As shown in  FIG. 1 , when the door  38  is opened, the cartridge mounting section  66  is exposed from the front surface  36  of the main body  35 . Accordingly, ink cartridges  68  can be inserted into and drawn out of the cartridge mounting section  66 . The ink cartridges  68  are mounted on the cartridge mounting section  66  and are thus connected to an ink jet recording head  41  (see  FIG. 2 ) through ink tubes. The ink jet recording head  41  records an image on the recording sheet by ejecting ink supplied from the ink cartridges  68 . 
     The scanner unit  12  is provided at the upper portion of the multi function device  10 . The scanner unit  12  includes a flat bed scanner (FBS) and an automatic document feeder (ADF). As shown in  FIG. 1 , a document cover  30  is disposed as the top plate of the multi function device  10  so as to be freely opened and closed. The ADF is disposed in the document cover  30 . Although not shown in the drawings, a platen glass and an image sensor are disposed in the lower portion of the document cover  30 . In the scanner unit  12 , an image of a document placed on the platen glass or a document fed by the ADF is read by the image sensor. 
     An operation panel  14  is disposed in the upper portion of the front surface of the multi function device  10  (see  FIG. 1 ). The operation panel  14  includes a liquid crystal display configured to display various information and input keys configured to accept information from an external input such as user&#39;s input. The liquid crystal display and the input keys are omitted in  FIG. 1 . The multi function device  10  operates on the basis of information input from the operation panel  14  or transmitted from the external information apparatus. 
     &lt;Printer Unit  11 &gt; 
     The configuration of the printer unit  11  will be described in detail now. 
     As shown in  FIG. 1 , the opening  13  is disposed at the center of the front surface  36  of the printer unit  11 . The sheet feed cassette  70  (see  FIG. 5 ) can be inserted into and drawn out of the main body  35  through the opening  13 . That is, the sheet feed cassette  70  can be inserted into the main body  35  in an insertion direction  90  and can be drawn out of the main body  35  in the drawing direction  92 . The insertion direction  90  is a direction in which the sheet feed tray  20  (sheet feed cassette  70 ) is inserted into the main body  35  through the opening  13 . The drawing direction  92  is a direction in which the sheet feed tray  20  (sheet feed cassette  70 ) is drawn out of the main body  35 . 
     As shown in  FIG. 2 , the printer unit  11  includes a sheet feed tray  20 , a feed roller  25  as an example of a feeding member, an arm  26 , and a power transmitting mechanism  27 . 
     As shown in  FIG. 2 , the feed roller  25  is disposed above the sheet feed tray  20 . The feed roller  25  is configured to feed a recording sheet on the sheet feed tray  20  to a first conveying path  22 . The arm  26  is disposed above the sheet feed tray  20 . The feed roller  25  is rotatably disposed at an end of the arm  26 . The feed roller  25  uses a motor (not shown) as a drive source and rotates with the power transmitted through the power transmitting mechanism  27 . The power transmitting mechanism  27  includes plural gears which engage with each other in series. 
     The arm  26  is supported by a base shaft  28  (see also  FIG. 4 ). The base end of the arm  26  is supported by the base shaft  28 . Accordingly, the arm  26  can pivot about the base shaft  28  in a direction such that the arm  26  moves to and moves away from the sheet feed tray  20 . The arm  26  is urged toward the sheet feed tray  20  by the weight of the arm  26  or the feed roller  25  or by a spring. 
     By urging the arm  26  downward, the feed roller  25  comes in pressing contact with the recording sheet placed on the sheet feed tray  20 . When the feed roller  25  is rotationally driven in this state, the uppermost recording sheet on the sheet feed tray  20  is sent to a slope plate  32  with a frictional force occurring between the roller surface of the feed roller  25  and the recording sheet. When the end of the recording sheet contacts with the slope plate  32 , the uppermost sheet of the stack of recording sheets is separated and guided upward. In this way, the recording sheets are fed from the sheet feed tray  20  to the first conveying path  22  sheet by sheet. 
     The first conveying path  22  is disposed above the slope plate  32 . The first conveying path  22  extends upward from the slope plate  32  and is bent in a lateral U shape toward the front surface  36  (to the right side of  FIG. 2 ). The first conveying path  22  extends from the rear surface of the multi function device  10  (from the left side of  FIG. 2 ) to the front surface  36  and extends to the sheet discharge tray  21  (see  FIG. 4 ) through the recording section  24 . The recording sheet fed from the sheet feed tray  20  is conveyed along the first conveying path  22 . The recording sheet is guided along the first conveying path  22  in a U shape from the downside to the upside, and reaches the recording section  24 . An image is recorded on the recording sheet by the recording section  24 . The recording sheet having an image recorded thereon in the course of conveying the recording sheet along the first conveying path  22  is discharged to the sheet discharge tray  21 . 
     As shown in  FIG. 2 , the recording section  24  is discharged in the middle way of the first conveying path  22  extending from the rear surface of the multi function device  10  to the front surface  36  (to the right side of  FIG. 2 ; see  FIG. 1 ). The recording section  24  is configured to record an image on the recording sheet in the course of conveying the recording sheet along the first conveying path  22 . The recording section  24  includes a carriage  40 , an ink jet recording head  41 , and a platen  42 . The ink jet recording head  41  is mounted on the carriage  40 . The carriage  40  reciprocates in the width direction of the recording sheet (in the direction perpendicular to the paper surface in  FIG. 2 ) along guide rails  43  and  44 . Although not shown in  FIG. 2 , the guide rail  44  is provided with a belt driving mechanism using a motor as a driving source. As an example of the belt driving mechanism, a driving pulley and a driven pulley are disposed at both ends in the width direction of the guide rail  44  and an endless driving belt is suspended on the driving pulley and the driven pulley. By connecting the carriage  40  to the driving belt of the belt driving mechanism, the driving force of the motor is transmitted to the carriage  40  through the belt driving mechanism and thus the carriage  40  reciprocates. 
     The first conveying path  22  is provided with the platen  42  facing the ink jet recording head  41 . The platen  42  supports the recording sheet conveyed through the first conveying path  22  from the downside. The recording sheet and the ink jet recording head  41  are supported with a predetermined head gap by the platen  42 . Color ink stored in the ink cartridges  68  (see  FIG. 1 ) are supplied to the ink jet recording head  41  through the ink tube. While the carriage  40  is reciprocating, the color ink is selectively ejected as minute ink droplets to the platen  42  from the ink jet recording head  41 . An image is recorded on the recording sheet conveyed over the platen  42  by the recording section  24  in the course of conveying the recording sheet. 
     A second conveying path  23  is configured to guide to the sheet feed tray  20  the recording sheet  65  with an image recorded on one surface thereof (recording surface  64 ; see  FIG. 3 ) and conveyed in a switch-back manner. That is, the second conveying path  23  is a path through which the recording sheet  65  having been conveyed through the first conveying path  22  is conveyed in the switch-back manner. As shown in  FIG. 2 , the second conveying path  23  connects the first conveying path  22  and the sheet feed tray  20 . One end of the second conveying path  23  is connected to the downstream side (downstream portion  45 ) of the recording section  24  in the first conveying path  22 . The other end of the second conveying path  23  is connected to the upstream side (right side in  FIG. 2 ) of the sheet feed tray  20  from the feed roller  25 . The downstream side (left side in  FIG. 2 ) of the sheet feed tray  20  from the feed roller  25  is connected to the first conveying path  22  through the slope plate  32 . Accordingly, the second conveying path  23  is connected to the upstream side (upstream portion  46 ) of the recording section  24  in the first conveying path  22  through the sheet feed tray  20 . 
     The second conveying path  23  is defined by a pair of upper guide member  47  and lower guide member  48  disposed to face each other with a predetermined gap. The upper guide member  47  and the lower guide member  48  extend obliquely downward to the upstream side of the feed roller  25  from the downstream portion  45  of the first conveying path  22 . 
     A conveying section  15  is configured to convey the recording sheet along the first conveying path  22  and the second conveying path  23 . The conveying section  15  includes the feed roller  25 , a conveying roller  50 , a discharge roller  51 , and a path switching section  72 . 
     As shown in  FIG. 2 , the conveying roller  50  is disposed on the upstream side (left side in  FIG. 2 ) in the recording sheet conveying direction from the recording section  24  in the first conveying path  22 . Although not shown in the drawing, a pinch roller pressed on the conveying roller  50  is disposed on the downstream side of the conveying roller  50 . The conveying roller  50  is disposed to extend in the width direction (direction perpendicular to the paper surface in  FIG. 2 ) of the first conveying path  22 . Plural pinch rollers are disposed with a predetermined gap in the width direction of the first conveying path  22 . The recording sheet conveyed through the first conveying path  22  is interposed by the conveying roller  50  and the pinch roller and is conveyed onto the platen  42 . 
     As shown in  FIG. 2 , the discharge roller  51  and a spur  52  are disposed on the downstream side from the recording section  24  in the first conveying path  22 . The spur  52  is disposed above the discharge roller  51  and is brought into pressing contact with the discharge roller  51 . The discharge roller  51  is disposed in the width direction of the first conveying path  22 . Plural spurs  52  are disposed with a predetermined gap in the width direction of the first conveying path  22 . The recording sheet with an image recorded thereon is interposed by the discharge roller  51  and the spurs  52  and is conveyed to the downstream portion  45  of the first conveying path  22 . The conveying roller  50  and the discharge roller  51  are driven using a motor (not shown) as a driving source. 
     As shown in  FIG. 2 , the path switching section  72  is disposed in the downstream portion  45  of the first conveying path  22 . The path switching section  72  is configured to select one of the sheet discharge tray  21  (see  FIG. 4 ) the second conveying path  23  (see  FIGS. 2 and 3 ), to which the recording sheet having been conveyed through the first conveying path  22  is to be sent. The path switching section  72  includes a switch-back roller  53 , a spur  54 , a frame  55 , and a spur  56 . 
     As shown in  FIG. 2 , the switching-back roller  53  and the spur  54  are disposed just below of the downstream portion  45  of the first conveying path  22 . The spur  54  is disposed above the switch-back roller  53  and is pressed on the switch-back roller  53 . The switch-back roller  53  is disposed in the width direction of the first conveying path  22 . Plural spurs  54  are disposed with a predetermined gap in the width direction of the first conveying path  22 . The recording sheet having been conveyed through the first conveying path  22  is discharged to the sheet discharge tray  21  by the switch-back roller  53  and the spurs  54 . The recording sheet having been conveyed through the first conveying path  22  is conveyed through the second conveying path  23  by the switch-back roller  53  and the spurs  54  in the switch-back manner. 
     The switch-back roller  53  is driven using a motor (not shown) as a driving source. The switch-back roller  53  can rotate in the forward and backward directions. The rotation direction of the switch-back roller  53  is controlled by means of the forward and backward rotation of the motor. The “forward rotation” and the “backward rotation” of the switch-back roller  53  are relative. In this embodiment, the rotation for sending the recording sheet to the sheet discharge tray  21  is called the “forward rotation” and the rotation for sending the recording sheet to the second conveying path  23  is called the “backward rotation”. 
     The spurs  54  are supported by the frame  55  and slidable to move to and move away from the switch-back roller  53 . Although not shown in detail in  FIG. 2 , the rotation shaft of the spurs  54  is elastically urged by a coil spring to always be pressed on the switch-back roller  53 . Accordingly, when the switch-back roller  53  rotates, the spurs  54  also rotate with the rotation thereof. 
       FIG. 3  is an enlarged sectional view illustrating the path switching section  72 , where the frame  55  is maintained in a horizontal posture. 
     The path switching section  72  includes the frame  55  and the spur  56 . The switch-back roller  53  is rotatably supported by the frame  55 . The frame  55  extends from the switch-back roller  53  to the upstream side in the conveying direction (to the left side in  FIG. 3 ) and reaches to the downstream portion  45 . The spur  56  is rotatably supported by the extension end of the frame  55  and the spur  56  is disposed in the downstream portion  45 . The frame  55  extends in the width direction (direction perpendicular to the paper surface of  FIG. 3 ) of the first conveying path  22 . Plural spurs  56  are disposed with a predetermined gap in the width direction of the first conveying path  22 . 
     The extension end of the frame  55  is rotatable about the rotation shaft of the switch-back roller  53 . The driving force of a motor (not shown) is transmitted to the frame  55 . Accordingly, the frame  55  enters into the rotation posture in which the frame rotates in the direction indicated by an arrow  85  from the state shown in  FIG. 3 . The spurs  54  supported by the base end of the frame  55  and the spurs  56  supported by the extension end of the frame  55  rotate around the rotation shaft of the switch-back roller  53  along with the frame  55 . The recording sheet  65  is guided and discharged to the sheet discharge tray  21  by the frame  55  having the horizontal posture. The recording sheet  65  is guided to pass through the second conveying path  23  by the frame  55  having the rotation posture. 
     &lt;Sheet Feed Cassette  70 &gt; 
       FIG. 4  is a perspective view illustrating the sheet feed cassette  70 , where the feed roller  25  is supported from the downside by the sheet feed tray  20 .  FIG. 5  is a perspective view illustrating a configuration of the sheet feed tray  20 . 
     As shown in  FIG. 4 , the sheet feed cassette  70  is formed in a thin rectangular shape as a whole in plan view and includes the sheet feed tray  20  and the sheet discharge tray  21 . The sheet feed tray  20  and the sheet discharge tray  21  are disposed to form two vertical stages in which the sheet discharge tray  21  is disposed above the sheet feed tray  20 . The sheet feed cassette  70  can be inserted into the main body  35  and can be drawn out of the main body  35  through the opening  13  (see  FIG. 1 ). The sheet feed tray  20  and the sheet discharge tray  21  are incorporated into the sheet feed cassette  70 . Accordingly, the sheet discharge tray  21  is inserted to and drawn out of the main body  35  with the insertion and drawing of the sheet feed tray  20 . 
     The sheet feed cassette  70  is inserted into the opening  13  of the main body  35  and is mounted on the main body  35 . Accordingly, as shown in  FIG. 4 , the sheet feed tray  20  is disposed below the arm  26  and the feed roller  25 . The base shaft  28  of the arm  26  is rotatably disposed in the main body  35 , where the axial direction thereof is parallel to a first direction  94 . Here, the first direction  94  is substantially horizontal and substantially perpendicular to the drawing direction  92  of the sheet feed tray  20 . As shown in  FIG. 4 , the base shaft  28  extends from the center portion in the width direction (the first direction  94 ) of the sheet feed tray  20  over a side wall  123 . The base shaft  28  rotates around the axial direction using a motor (not shown) as a driving source. The rotation of the base shaft  28  is transmitted to the feed roller  25  through the power transmitting mechanism  27  and thus the feed roller  25  rotates. 
     The sheet discharge tray  21  is rotatable upward relative to the sheet feed tray  20 , where the axial direction is the width direction (the first direction  94 ) of the sheet feed cassette  70 . When the sheet discharge tray  21  rises up relative to the sheet feed tray  20 , the top surface of the sheet feed tray  20  is opened and thus recording sheets can be placed on the sheet feed tray  20 . When the sheet discharge tray  21  falls down relative to the sheet feed tray  20 , the top surface of the sheet feed tray  20  is covered with the sheet discharge tray  21  (see  FIG. 4 ). In this state, the sheet discharge tray  21  receives the recording sheet from the first conveying path  22  (see  FIG. 2 ) and serves as a cover of the sheet feed tray  20 . As shown in  FIG. 4 , the upper portion in a deep side (the side of the insertion direction  90 ) of the sheet feed tray  20  is opened to receive the feed roller  25  or the arm  26 . 
     &lt;Sheet Feed Tray  20 &gt; 
     As shown in  FIG. 5 , the sheet feed tray  20  is formed substantially in a tray shape which is longitudinal in the insertion direction  90  and the drawing direction  92  in plan view. The sheet feed tray  20  includes a tray body  102  and an extension tray  114  (see  FIG. 3 ). In the sheet feed tray  20 , the extension tray  114  can slide in the insertion direction  90  and the drawing direction  92  relative to the tray body  102 . The extension tray  114  slides in the insertion direction  90  or the drawing direction  92  relative to the tray body  102  as needed. Accordingly, the sheet placing surface of the sheet feed tray  20  is expanded or reduced depending on the position of the extension tray  114 , thereby the sheet feed tray  20  can support various sizes of recording sheets. 
     As shown in  FIG. 5 , the tray body  102  is formed in a rectangular shape which is longitudinal in the insertion direction  90  and the drawing direction  92 . The tray body  102  includes a bottom plate  84 . The recording sheets are placed on the bottom plate  84 . The slope plate  32  is disposed at the end  74  of the tray body  102 . The slope plate  32  is a plate-like member longitudinal in the width direction (the first direction  94 ) of the tray body  102 . The slope plate  32  is tilted toward the rear surface (in the insertion direction  90 ). Accordingly, when the end of the recording sheet contacts with the slope plate  32 , the end is guided obliquely upward along the inner side surface  77  of the slope plate  32 . That is, the inner side surface  77  serves as a guide surface guiding the recording sheet to the first conveying path  22  (see  FIG. 2 ). 
     As shown in  FIG. 5 , a frictional member  104  is disposed at the center portion of the tray body  102  in the first direction  94 . The frictional member  104  is made of cork or rubber having a high friction constant with the recording sheet. In this embodiment, two feed rollers  25  are disposed on both sides in the first direction  94  of the end of the arm  26  (see  FIG. 4 ). Two feed rollers  25  move to the sheet feed tray  20  with the rotation of the arm  26 . Accordingly, the feed rollers  25  are disposed just above the frictional member  104 . When the sheet feed tray  20  with the recording sheets placed thereon is inserted into the main body  35 , the feed roller  25  is brought into pressing contact with the recording sheet on the sheet feed tray  20 . Accordingly, the recording sheets are interposed between the frictional member  104  and the feed roller  25 . A frictional force in the insertion direction  90  is applied to the uppermost recording sheet of plural recording sheets interposed between the frictional member  104  and the feed roller  25  from the feed roller  25 . On the contrary, a frictional force in the drawing direction  92  is applied to the lower recording sheets from the feed roller  25 . The number of the feed rollers  25  is not limited to two. For example, one feed roller  25  may be disposed at the end of the arm  26 . 
     A pair of side guides  80  and  81  is disposed in the tray body  102 . The side guides  80  and  81  are configured to regulate the position in the width direction of the recording sheets placed on the sheet feed tray  20  to correspond to the center in the width direction of the sheet feed tray  20 . One of the side guides  80  and  81  slides in the first direction  94 . Then, the other of the side guides  80  and  81  slides in the opposite direction. Accordingly, when the width of the recording sheets placed on the sheet feed tray  20  is smaller than the separation gap between the side guides  80  and  81 , one of the side guides  80  and  81  is made to slide, whereby the side guides  80  and  81  simultaneously move. As a result, the center position in the width direction of the recording sheets substantially corresponds to the center in the width direction of the sheet feed tray  20 . 
     A rear guide  120  is disposed at the center portion of the tray body  102  in the first direction  94 . The rear guide  120  is configured to regulate the movement of the recording sheets placed on the sheet feed tray  20  to the rear end (in the drawing direction  92 ) of the tray body  102 . The rear guide  120  is slidable along the insertion direction  90  in a state where the recording sheets are placed on the sheet feed tray  20 . Then, the rear guide  120  contacts with the rear ends of the recording sheets. As a result, the rear ends of the recording sheets can be arranged and are regulated at the position corresponding to the size of the recording sheets. The ends of the recording sheets are positioned at a predetermined position in the sheet feed tray  20  close to the slope plate  32 , regardless of the size of the recording sheets. 
     &lt;Cam  125  and Cam Follower  58 &gt; 
     As shown in  FIG. 4 , a cam follower  58  is disposed below the base shaft  28 . The cam follower  58  is configured to transmit to the arm  26  the motion of a cam  125  resulting from the insertion or drawing of the sheet feed tray  20  (sheet feed cassette  70 ) relative to the main body  35 . The cam follower  58  is fixed to the base shaft  28  and the arm  26 . The cam follower  58  extends from the arm  26  to above the cam  125  in the first direction  94 . The cam follower  58  extends from the base shaft  28  to be substantially parallel to the arm  26 . The cam follower  58  has a plane  91  substantially parallel to the longitudinal direction of the arm  26 . The plane  91  is a surface to be contact with the cam  125 . 
     As shown in  FIG. 4 , side walls  122  and  123  facing to each other and in the first direction  94  are disposed in the tray body  102 . The side walls  122  and  123  rise up vertically from the bottom plate  84  of the tray body  102 . The cam  125  is formed on a side of the side wall  123  along the insertion direction  90 . The cam  125  is configured to transmit to the cam follower  58  the motion of the sheet feed tray  20  resulting from the insertion or drawing of the sheet feed tray  20  relative to the main body  35 . In other words, the cam  125  is configured to transmit to the cam follower  58  the motion of the sheet feed tray  20  in the insertion direction  90  or the drawing direction  92 . 
     As shown in  FIG. 5 , the cam  125  includes a first inclined surface  111 , a second inclined surface  112 , and a horizontal surface  113 . The first inclined surface  111 , the second inclined surface  112 , and the horizontal surface  113  are continuously formed from the top surface  109  of the side wall  123  to the end  74  of the tray body  102  in the insertion direction  90 . The top surface  109  and the horizontal surface  113  have substantially the same height from the bottom plate  84 . The first inclined surface  111  and the second inclined surface  112  are disposed between the top surface  109  and the horizontal surface  113 . The first inclined surface  111  is inclined downward in the insertion direction  90  between the top surface  109  and the second inclined surface  112 . The second inclined surface  112  is inclined upward in the insertion direction  90  between the first inclined surface  111  and the horizontal surface  113 . The horizontal surface  113  is disposed between the second inclined surface  112  and the end  74  of the tray body  102  so as to be substantially parallel to the top surface  109 . In this way, the cam  125  is formed at the side wall  123  so that the height from the bottom plate  84  (see  FIG. 5 ) varies in the insertion direction  90  and the drawing direction  92 . 
     In this embodiment, the cam  125  is formed in one side wall  123  of the side walls  122  and  123  facing the first direction  94 . The cam  125  may be formed at the side wall  122 , not in the side wall  123 . In this case, the base shaft  28  and the cam follower  58  extend from the base end of the arm  26  to the side wall  122 . The cam  125  may be formed at both the side walls  122  and  123 . In this case, the base shaft  28  and the cam follower  58  are made to extend from the base end of the arm  26  to the side wall  122  and the side wall  123 . 
     &lt;Frame  133 &gt; 
       FIG. 6  is a perspective view illustrating the frame  133 , where the sheet feed tray  20  is inserted into the main body  35 .  FIG. 7  is an enlarged sectional view of the arm  26 , where the sheet feed tray  20  is inserted into the main body  35 .  FIG. 8  is a perspective view of the frame  133 , where the sheet feed tray  20  is drawn out of the main body  35 .  FIG. 9  is an enlarged sectional view of the arm  26 , where the sheet feed tray  20  is drawn out of the main body  35 . The base shaft  28  is omitted in  FIGS. 6 and 8 . 
     The main body  35  is constructed by attaching the cover  108  (see  FIG. 1 ) to the frame  133  (see  FIGS. 6 and 8 ). The frame  133  maintains elements of the multi function device  10 . As shown in  FIGS. 6 and 8 , the frame  133  includes a separation plate  117  at a position close to the front surface  36  (in the drawing direction  92 ) of the main body  35  and at the center in the width direction (the first direction  94 ). The separation plate  117  is mounted with the operation panel  14  (see  FIG. 1 ) or a control board (not shown) of the multi function device  10 . As shown in  FIGS. 6 and 8 , walls  86  and  87  are disposed on both edges of the separation plate  117 . The walls  86  and  87  extend vertically downward from the ends of the separation plate  117  in the width direction (the first direction  94 ). The space  135  (see  FIG. 1 ) is defined below the separation plate  117  by the separation plate  117  and the walls  86  and  87 . The sheet feed tray  20  is inserted into the main body  35  through the opening  13  and is disposed in the space  135 . 
     As shown in  FIGS. 6 and 8 , the frame  133  includes a shaft  136  at a position close to the front surface  36  (a side in the insertion direction  92 ) of the main body  35  and on the right side in the width direction (the first direction  94 ). The door  38  is supported by the shaft  136  to be rotatable relative to the frame  133 . The right space in the width direction of the frame  133  with the wall  86  interposed therebetween serves as a storing section  139 . The cartridge mounting section  66  (see  FIG. 1 ) is disposed in the storing section  139 . 
     As shown in  FIGS. 6 and 8 , the frame  133  includes a bottom plate  127  close to the rear surface (a side in the insertion direction  90 ) of the main body  35 . The bottom plate  127  constitutes the bottom surface of the frame  133 . The bottom plate  127  is a plate-like member having a longitudinal direction parallel to the first direction  94  and is disposed to connect the lower edge of the wall  86  to the lower edge of the wall  87 . As shown in  FIG. 8 , a recess portion  147  is formed at the center of the bottom plate  127  in the first direction  94 . The recess portion  147  is formed downward from the opposed surface  145  (see  FIG. 8 ) facing the sheet feed tray  20  disposed on the bottom plate  127  (see  FIG. 9 ). The cleaning member  130  is disposed in the recess portion  147  (see  FIGS. 7 and 9 ). 
     The cleaning member  130  is configured to remove paper dust, ink, dust, and the like adhering to the feed roller  25  from the feed roller  25 . A material which can be elastically deformed is properly used as the cleaning member  130 . The material of the cleaning member  130  can include rubber, brush, felt, and the like and can be properly modified in consideration of the material of the roller surface of the feed roller  25 . The recess portion  147  is provided at a position at which the fee roller  25  moving to the bottom plate  127  can contact with the cleaning member  130  in a state where the feed tray  20  is not disposed on the bottom plate  127 . The width of the recess portion  147  in the first direction  94  is greater than the axial length (in the first direction  94 ) of two feed rollers  25 . The width of the recess portion  147  in the insertion direction  90  is set so that the roller surface of the feed roller  25  can contact with the cleaning member  130 . 
     The change in posture of the arm  26  accompanied with the drawing of the feed tray  20  from the main body  35  will be described now. 
     As shown in  FIG. 2 , the feed roller  25  is disposed at the end of the arm  26 . The arm  26  can rotate about the base shaft  28  in directions such that the arm  26  moves to and moves away from the bottom plate  127  of the frame  133  (see  FIG. 9 ). In this embodiment, the feed roller  25  changes its posture relative to the cleaning member  130  between the first posture (see  FIGS. 6 and 7 ) and the second posture (see  FIGS. 8  and  9 ) with the rotation of the arm  26 . In the state where the feed roller  25  is maintained in the first posture relative to the cleaning member  130 , the feed roller  25  is supported from the downside by the sheet feed tray  20  (see  FIG. 6 ). In the state where the feed roller  25  is maintained in the second posture relative to the cleaning member  130 , the feed roller  25  is brought into pressing contact with the cleaning member  130  (see  FIG. 8 ). 
     The recording operation of an image in the printer unit  11  is performed in a state where the sheet feed tray  20  is inserted into the main body  35 . In other words, the recording operation of an image in the printer unit  11  is performed in a state where the sheet feed tray  20  is inserted into the deep side of the main body  35 . In still other words, the sheet feed tray  20  is attached to main body  35  when the sheet feed tray  20  is positioned at a first position of the opposed surface  145 . The cleaning member  130  is covered with the sheet feed tray  20  when the sheet feed tray  20  is positioned at the first position. By inserting the sheet feed tray  20  into the main body  35 , the slope plate  32  is brought into contact with the lower end of the first conveying path  22  (see  FIG. 2 ). In this state, as shown in  FIG. 4 , the plane  91  of the cam follower  58  contacts with the first inclined surface  111  of the cam  125 . Accordingly, the rotation of the cam follower  58  to the sheet feed tray  20  is regulated, and the arm  26  is inclined downward at the same angle as the first inclined surface  111 . 
     The cam follower  58  is urged to the sheet feed tray  20  by means of the weight of the cam follower  58 , the arm  26 , and the feed roller  25 . That is, the roller is urged toward the surface by a gravitational force acting on at least one of the cam follower  50 , the arm  26  and the feed roller  25 . When the recording sheets are not placed on the sheet feed tray  20 , the feed roller  25  contacts with the frictional member  104  (see  FIG. 5 ) of the bottom plate  84 . When the recording sheets are placed on the sheet feed tray  20 , the feed roller  25  moves upward by the thickness of the recording sheets. Accordingly, the cam follower  58  is separated from the first inclined surface  111 . Since the feed roller  25  is supported from the downside by the recording sheets placed on the sheet feed tray  20 , the feed roller  25  contacts with the recording sheets placed on the sheet feed tray  20 . By rotationally driving the feed roller  25  in this state, the recording sheet on the sheet feed tray  20  is fed to the first conveying path  22 . In this way, in the state where the sheet feed tray  20  is inserted into the main body  35 , the sheet feed roller  25  is maintained in the first posture (see  FIGS. 7 and 8 ) where it is supported from the downside by the sheet feed tray  20 . 
     The sheet feed tray  20  is drawn in the drawing direction  92  from the state where it is inserted into the main body  35  (i.e., from the first position). Then, the surface of the cam  125  contacting with the plane  91  of the cam follower  58  moves from the first inclined surface  111  to the second inclined surface  112 . The second inclined surface  112  of the cam  125  is formed so that the height of the bottom plate  84  (see  FIG. 5 ) increases in the insertion direction  90 . Accordingly, the cam follower  58  and the arm  26  rotate upward with the drawing of the sheet feed tray  20  from the main body  35 . As a result, the sheet feed roller  25  moves upward with respect to the sheet feed tray  20 . 
     When the sheet feed tray  20  is further drawn out of the main body  35  in the drawing direction  92 , the cam follower  58  is supported by the horizontal surface  113 . In this state, the cam follower  58  and the arm  26  are maintained in the horizontal posture and the feed roller  25  is disposed higher than the slope plate  32 . By further drawing the sheet feed tray  20  in the drawing direction  92 , the end  74  of the tray body  102  moves downstream of the arm  26  in the drawing direction  92  and thus the support of the cam follower  58  by the cam  125  is released. The arm  26  rotates toward the bottom plate  127  of the frame  133  by means of the weight of the arm  26 , the feed roller  25 , and the cam follower  58 . In this way, by drawing the sheet feed tray  20  from the main body  35  to a second position in the drawing direction  92 , the feed roller  25  changes its posture to the second posture where the feed roller comes in contact with the cleaning member  130  (see  FIGS. 8 and 9 ). Here, the second position is a position where the support of the cam follower  58  by the cam  125  is released with the drawing of the sheet feed tray  20 . When the sheet feed tray  20  is positioned at the second position or downstream of the second position in the drawing direction  92 , the cleaning member  130  is uncovered by the sheet feed tray  20  such that the feed roller  25  can be cleaned by the cleaning member  130 . In this way, since the motion of the sheet feed tray  20  is transmitted to the arm  26  through the cam  125  and the cam follower  58 , the arm  26  and the feed roller  25  can change their posture with a simple configuration. 
     Although  FIGS. 8 and 9  shows a state where the sheet feed tray  20  is completely drawn out of the main body  35 , the feed roller  25  can change its posture from the first posture to the second posture without completely drawing the sheet feed tray  20  out of the main body  35 . That is, the feed roller  25  changes its posture from the first posture to the second posture by drawing the sheet feed tray  20  with respect to the main body  35  to the second position where the support of the cam follower  58  by the cam  125  is released. The second position may be a position of the sheet feed tray  20  having been completely drawn out of the space  135  of the main body  35 . 
     In recording an image, the sheet feed tray  20  with recording sheets placed thereon is inserted into the main body  35  and positioned at the first position. Accordingly, the feed roller  25  becomes the first posture where the feed roller  25  is supported from the downside by the sheet feed tray  20  and the feed roller  25  contacts with the recording sheet on the sheet feed tray  20 . When a print command is given on the basis of a user&#39;s predetermined operation from the operation panel  14 , the feed roller  25  is rotationally driven. Accordingly, the recording sheet on the sheet feed tray  20  is fed to the first conveying path  22  in the direction indicated by the arrow  17  (see  FIG. 2 ). An image is recorded on one surface (recording surface  64 ) of the recording sheet by the recording section  24  in the course of conveying the recording sheet through the first conveying path  22 . 
     When a print mode is set to the one-sided recording operation, the switch-back roller  53  rotates forward in a state where the frame  55  is maintained in the horizontal posture (see  FIG. 3 ). Accordingly, the recording sheet  65  (see  FIG. 3 ) with an image recorded on the recording surface  64  is discharged from the first conveying path  22  to the sheet discharge tray  21 . 
     When the print mode is set to the double-sided recording operation, the switch-back roller  53  rotates forward in a state where the frame  55  is maintained in the horizontal posture. Accordingly, the recording sheet  65  with an image recorded on the recording surface  64  as described above is sent toward the sheet discharge tray  21  (to the right side in FIG.  3 ). Then, when the rear end  62  of the recording sheet  65  reaches to a predetermined position on the more upstream side than the spurs  56  (the state shown in  FIG. 3 ), the frame  55  changes its posture from the horizontal posture and the rotation posture. With this change in posture, the rear end  62  of the recording sheet  65  is pressed downward by the spurs  56  and is sent to the second conveying path  23 . 
     The switch-back roller  53  rotates backward in the state where the frame  55  is maintained in the rotation posture. Then, the recording sheet  65  changes its conveying direction, is conveyed through the second conveying path  23  in the switch-back manner, and is sent to the sheet feed tray  20 . Specifically, the recording sheet  65  is sent between the uppermost recording sheet placed on the sheet feed tray  20  and the feed roller  25  (hereinafter, referred to as “contact position”). When the rear end  62  of the recording sheet  65  reaches the contact position, the feed roller  25  is rotationally driven and the recording sheet  65  is sent to the upstream side (upstream portion  46 ) of the recording section  24 . The recording sheet  65  is turned over in the conveyance course. That is, when the recording sheet  65  is conveyed onto the platen  42 , the opposite surface of the recording surface  64  faces the ink jet recording head  41 . When the recording sheet  65  passes through the platen  42 , an image is recorded on the other surface (the opposite surface of the recording surface  64 ). When the recording sheet  65  is sent from the second conveying path  23  to the first conveying path  22 , the arm  55  changes its posture from the rotation posture to the horizontal posture. The recording sheet  65  with images recorded on both surfaces thereof is discharged to the sheet discharge tray  21  from the first conveying path  22  by the switch-back roller  53  which rotates forward. 
     In the printer unit  11 , the feed roller  25  is rotationally driven in the state where the feed roller contacts with the recording sheet placed on the sheet feed tray  20 . Accordingly, the paper dust or dust on the recording sheet may be attached to the feed roller  25 . When the double-sided recording operation is performed by the printer unit  11 , the feed roller  25  is rotationally driven in the state where the feed roller  25  contacts with the recording surface  64  (see  FIG. 3 ) of the recording sheet  65 . Ink ejected from the ink jet recording head  41  (see  FIG. 2 ) is attached to the recording surface  64 . When the recording sheet  65  is sent from the second conveying path  23  to the sheet feed tray  20  in a state where the ink attached to the recording surface  64  is not sufficiently dried, the ink of the recording sheet  65  may adhere to the feed roller  25 . In this way, paper dust, dust, and ink may adhere to the feed roller  25 . As a result, a feed failure may occur in feeding a recording sheet from the sheet feed tray  20  to the first conveying path  22 . 
     An operation of cleaning the feed roller  25  is performed as follows. 
     The sheet feed tray  20  is supported from the downside by the bottom plate  127  of the frame  133  in the state where the sheet feed tray  20  is inserted into the main body  35  (see  FIGS. 6 and 7 ). Accordingly, the feed roller  25  is maintained in the first posture where it is supported from the downside by the sheet feed tray  20 . When the recording sheet is not correctly conveyed from the sheet feed tray  20  to the first conveying path  22 , the sheet feed tray  20  is drawn out to a predetermined position from the main body  35  by the user. For example, the sheet feed tray  20  is drawn out of the main body  35  using a mark recorded on the sheet feed tray  20  as a reference. Then, the motion of the sheet feed tray  20  is transmitted to the arm  26  through the cam  125  and the cam follower  58  and the feed roller  25  moves upward above the sheet feed tray  20 . When the sheet feed tray  20  is further drawn out relative to the main body  35 , the support of the cam follower  58  by the cam  125  is released. Accordingly, the feed roller  25  can changes its posture from the first posture (see  FIGS. 6 and 7 ) to the second posture (see  FIGS. 8 and 9 ) relative to the cleaning member  130 . That is, the feed roller  25  having come in pressing contact with the recording sheet on the sheet feed tray  20  once moves upward and then contacts with the cleaning member  130  of the bottom plate  127 . Accordingly, the feed roller  25  can be cleaned. By rotationally driving the feed roller  25  in this state, the feed roller  25  is cleaned by the cleaning member  130 . Here, the cleaning is an operation of rotationally driving the feed roller  25  in a state where the cleaning member  130  is brought into contact with the feed roller  25 . Accordingly, the paper dust, ink, and dust attached to the feed roller  25  is removed from the feed roller  25 . 
     As described above, the feed roller  25  can be cleaned by means of a simple operation, e.g., by simply drawing out the sheet feed tray  20  from the main body  35  to the predetermined position. Accordingly, it is possible to clean the feed roller  25  with a simple structure without allowing a user to perform a troublesome operation of installing the cleaning member or separating and retaining the cleaning member. Since the cleaning member  130  is disposed on the bottom plate  127  located below the sheet feed tray  20 , the recording sheets on the sheet feed tray  20  are prevented from the contamination due to the cleaning member  130 . 
     In the printer unit  11 , the feed roller  25  is brought into pressing contact with the cleaning member  130  by drawing out the sheet feed tray  20  from the main body  35  to the predetermined position in the drawing direction  92 . The predetermined position is a position where the cam follower  58  is separated from the cam  125 . Accordingly, it is possible to clean the feed roller  25  without completely drawing out the sheet feed tray  20  from the main body  35 . That is, the feed roller  25  is cleaned in the state where a part of the sheet feed tray  20  is disposed in the space  135  of the main body  35 . Accordingly, since a user&#39;s hand does not contact with the feed roller  25  during the cleaning of the feed roller  25 , it is possible to safely clean the feed roller  25 . 
     The feed roller  25  changes its posture from the first posture to the second posture without taking out the recording sheets from the sheet feed tray  20 . Accordingly, it is possible to clean the feed roller  25  during the recording operation in the printer unit  11 . 
     In this embodiment, the cleaning member  130  is formed of rubber which can be elastically deformed. Accordingly, when the feed roller  25  is brought into pressing contact with the cleaning member  130 , the cleaning member  130  is brought into close contact with the feed roller  25 . Therefore, it is possible to enhance the cleaning effect, compared with a case where the cleaning member  130  cannot be elastically deformed. However, the cleaning member  130  may be formed of a material which cannot be elastically deformed. In this case, the roller surface of the feed roller  25  may be formed of an elastically deformable material, which can absorb the damage of the feed roller  25  due to the cleaning operation. 
     In this embodiment, it has been described that the image recording apparatus is of a double-sided recording type which can record images on both surfaces of the recording sheet  65 . The image recording apparatus according to the embodiment is not limited to the double-sided recording apparatus. That is, the image recording apparatus according to the embodiment may be a one-sided recording apparatus which can record an image on only one surface of the recording sheet  65 . However, when the image recording apparatus according to the embodiment is applied to the double-sided recording apparatus, the ink attached to the feed roller  25  can be removed from the feed roller  25 . 
     In this embodiment, the cleaning member  130  is disposed in the recess portion  147 . Accordingly, when the feed roller  25  is rotational driven in the state where the feed roller is maintained in the second posture (see  FIGS. 8 and 9 ), it is possible to prevent the cleaning member  130  from moving in the rotation direction of the feed roller  25 . As shown in  FIG. 9 , by providing the cleaning member  130  in the recess portion  147  so as not to protrude from the top surface of the opposed surface  145 , it is possible to prevent paper dust, ink, dust, and the like removed from the feed roller  25  by the cleaning member  130  from adhering to the sheet feed tray  20  or the frame  133 . 
     As long as the feed roller can move in the directions toward and away from the bottom plate  127  of the frame  133 , the feed roller  25  need not be supported by the arm  26 . For example, the feed roller  25  may be rotatably supported by a shaft that is slidable in the vertical direction. 
     Another Embodiment 
       FIGS. 10A and 10B  are diagrams schematically explaining a state where the cleaning member  130  is moving to the feed roller  25  with the drawing of the sheet feed tray  20 . 
     The cleaning member  130  may be elastically urged to the feed roller  25  so that the feed roller  25  changes its posture from the first posture to the second posture. In a modified example of the embodiment, the feed roller  25  is rotatably supported by a shaft  144  fixed to the main body  35  (see  FIGS. 10A and 10B ). Here, a plate  138  is disposed on the bottom plate  84  of the tray body  102  with a coil spring  137  interposed therebetween. The downstream portion of the plate  138  in the insertion direction  90  is elastically urged upward by the coil spring  137  (see  FIG. 10A ). The recording sheet is placed on the plate  138  and is placed on the sheet feed tray  20 . 
     As shown in  FIGS. 10A and 10B , a storing portion  149  is formed at the bottom plate  127  below the feed roller  25 . A support member  142  is disposed at the storing portion  149 , for example, with an urging member such as a coil spring  141  interposed therebetween. The cleaning member  130  is disposed on the support member  142 . Accordingly, the cleaning member  130  is elastically urged to the feed roller  25  relative to the bottom plate  127 . 
     When the sheet feed tray  20  is inserted into the main body  35  in the insertion direction  90 , the bottom plate  84  of the tray body  102  rides on the support member  142 . Accordingly, the support member  142  is pushed down by the bottom plate  84  of the sheet feed tray  20  (see  FIG. 10A ). Then, the coil spring  141  is compressed and the coil spring  141  thus accumulates the spring force for pushing up the support member  142  to the feed roller  25 . Since the plate  138  is elastically urged upward, the recording sheets on the sheet feed tray  20  is brought into pressing contact with the feed roller  25 . Accordingly, the feed roller  25  is maintained in the first posture where it is supported from the downside by the sheet feed tray  20  (see  FIG. 10A ). 
     The sheet feed tray  20  is drawn out from the main body  35  to a second position in the drawing direction  92  (see  FIGS. 10A and 10B ). Accordingly, the pressing force on the cleaning member  130  from the bottom plate  84  disappears and the support member  142  moves to the feed roller  25  with the spring force accumulated by the coil spring  141 . As a result, the feed roller  25  is brought into contact with the cleaning member  130  disposed in the support member  142  (see  FIG. 10B ). By rotationally driving the feed roller  25  in this state, the feed roller  25  is cleaned by the cleaning member  130 . 
     According to the embodiments of the invention, there is provided: an image recording apparatus according to an aspect of the invention includes: a main body; a first tray attachable to and capable of being drawn out of the main body, the first tray allowing a sheet to be placed thereon; a first conveying path through which the sheet fed from the first tray is conveyed; a roller that is brought into pressing contact with the sheet placed on the first tray and configured to feed the sheet to the first conveying path; a recording unit configured to record an image on the sheet in a course of conveying the sheet; a frame configured to support the first tray from a downside; and a cleaning member disposed at the frame to clean the roller. Here, the roller is changeable its posture relative to the cleaning member between a first posture in which the roller is supported from the downside by the first tray in a state where the first tray is inserted into the main body and a second posture in which the roller is brought into pressing contact with the cleaning member by drawing out the first tray from the main body to a predetermined position. 
     A sheet is allowed to be placed on the first tray. The first tray can be drawn from the main body. A printing start is instructed in a state where the first tray is inserted into the main body. Then, the roller press-contacting with the sheet on the first tray is rotationally driven and the sheet is fed from the first tray to the first conveying path. An image is recorded on the sheet by a recording section in the course of conveying the sheet through the first conveying path. The image is recorded by attaching ink or toner to the sheet. 
     The first tray is supported from the downside by the frame disposed in the main body. The cleaning member is disposed at the frame. In the image recording apparatus, the roller is cleaned by the cleaning member. The cleaning is performed by rotationally driving the roller in a state where the cleaning member is brought into contact with the roller. By this operation, paper dust, ink, toner, dust, and the like adhering to the roller are removed from the roller. The cleaning member used in this operation may be made of rubber, brush, or felt. 
     The roller can change its posture relative to the cleaning member between the first posture and the second posture. That is, the roller moves relative to the cleaning member disposed at a predetermined position, or the cleaning member moves relative to the roller disposed at a predetermined position. Accordingly, the roller changes its posture relative to the cleaning member between the first posture and the second posture. When the first tray is inserted into the main body, the change in posture from the first posture to the second posture is regulated and the roller is thus kept in the first posture. In the first posture, the roller is supported from the downside by the first tray. That is, in the first posture, the first tray is interposed between the roller and the cleaning member and thus the roller is separated from the cleaning member. By drawing out the first tray from the main body to a predetermined position, the regulation by the first tray is released and the roller changes its posture from the first posture to the second posture. An example of the predetermined position is a position where the first tray is not drawn out completely from the main body. In the second posture, the roller moves in the direction in which it gets close to the cleaning member, and brought into pressing contact with the cleaning member. This change in posture may be executed, for example, by allowing the cleaning member to move toward the roller rotatably attached to the main body. 
     As described above, the roller can be cleaned by simply drawing out the first tray from the main body to the predetermined position. Accordingly, it is possible to clean the roller with a simple configuration without allowing a user to perform troublesome operations of installing the cleaning member or separating and retaining the cleaning member. Since the cleaning member is disposed in the frame located below the first tray, it is possible to prevent the sheets on the first tray from being contaminated by the cleaning member. At the time of cleaning the roller, it is not necessary to perform operations of taking out the sheets from the tray or returning the taken-out sheets to the tray. 
     The image recording apparatus may further include an arm that can rotate or pivot about a predetermined axis in a direction toward and away from the frame. Here, the roller may be rotatably disposed at an end of the arm. 
     The roller is rotatably disposed at an end of the arm. The arm can pivot or rotate about a predetermined pivot in the direction such that the arm moves to and moves away from the frame. The first tray is inserted into the main body. Then, the arm is made to rotate by the first tray, the roller is separated from the cleaning member, and the roller is brought into pressing contact with the sheet on the first tray. That is, the sheet can be fed from the first tray to the first conveying path. The first tray is drawn out of the main body to a predetermined position. Accordingly, the arm moves to the frame, for example, by the weight of the arm and the roller. As a result, the roller is brought into pressing contact with the cleaning member and thus the roller can be cleaned. 
     The image recording apparatus may further include: a cam formed in at least one side wall of the first tray facing a first horizontal direction substantially perpendicular to a drawing direction of the first tray; and a cam follower that extends along the first direction from the arm and configured to transmit a motion of the cam accompanied with the movement of the first tray to the arm. 
     The motion of the cam accompanied with the movement of the first tray is transmitted to the arm through the cam follower. As a result, the roller disposed at the end portion of the arm changes its posture relative to the cleaning member between the first posture and the second posture. According to the above-mentioned configuration, the roller can change its posture with a simple structure. 
     The frame may have a recess portion at a surface facing the first tray, and the cleaning member may be disposed in the recess portion. 
     The cleaning member is disposed in the recess portion formed at the frame. Accordingly, it is possible to prevent paper dust, ink, toner, dust, and the like removed from the roller by the cleaning member from being adhering to the first tray or the frame. 
     The cleaning member may be elastically urged toward the roller so that the roller relatively changes its posture from the first posture to the second posture. 
     The cleaning member is elastically urged toward the roller, for example, by a coil spring. When the first tray is inserted into the main body, the cleaning member is pushed down by the first tray. Accordingly, the coil spring is compressed and thus the coil spring accumulates a spring force for pushing up the cleaning member toward the roller. When the first tray is drawn out from the main body to a predetermined position, the pressing force from the first tray to the cleaning member disappears and the cleaning member moves toward the roller with the spring force accumulated in the coil spring. As a result, the roller is brought into pressing contact with the cleaning member. 
     The cleaning member may be elastically deformable. 
     According to this configuration, when the roller changes its posture from the first posture to the second posture, the cleaning member is brought into close contact with the roller, thereby enhancing the cleaning effect. 
     The image recording apparatus may further include: a second conveying path that connects the first conveying path and the first tray and through which the sheet conveyed through the first conveying path is conveyed in a switch-back manner; a second tray to which the sheet conveyed through the first conveying path is discharged; and a path switching section configured to select one of the second tray and the second conveying path, to which the sheet conveyed through the first conveying path is sent. 
     An image is recorded on one surface of the sheet fed to the first conveying path by the recording section in the course of conveying the sheet. When a one-sided recording operation is set, the sheet is discharged to the second tray by the path switching section. When a double-sided recording operation is set, the sheet is sent to the second conveying path by the path switching section. The sheet is switched back and conveyed through the second conveying path and is fed to the first tray. The sheet is sent to the first conveying path again by rotationally driving the roller in the first posture. The sheet is turned over in the course of conveying the sheet and an image is recorded on the other surface by the recording section. In this way, the images are recorded on both sides of the sheet and the sheet is discharged from the first conveying path to the second tray by the path switching section. 
     When the sheet in which an image is recorded on one surface thereof is sent to the first conveying path again, the roller is brought into pressing contact with the recording surface of the sheet. The recording surface is a surface of the sheet to which ink or toner is attached by the recording section. When the sheet is sent to the first conveying path again in a state where the ink or toner is not sufficiently dried, the ink or toner on the sheet may adhere to the roller. However, by changing the posture of the roller from the first posture to the second posture and rotationally driving the roller, the roller is cleaned and the ink or toner adhering to the roller is removed from the roller. 
     According to the embodiments of the invention, the roller can be cleaned by drawing out the first tray from the main body to the predetermined position. Accordingly, it is possible to clean the roller with a simple configuration without troublesome operations of installing the cleaning member or separating and retaining the cleaning member. Since the cleaning member is disposed at the frame located below the first tray, it is possible to prevent the sheets on the first tray from being contaminated by the cleaning member. At the time of cleaning the roller, it is not necessary to perform operations of taking out the sheets from the tray or returning the taken-out sheets to the tray.