Patent Publication Number: US-2007097457-A1

Title: Image reader and image forming device

Description:
CROSS REFERENCE TO RELATED APPLICATIONS  
      This application claims priority from Japanese Patent Application No. 2005-317046 filed Oct. 31, 2005. The entire content of priority application is incorporated herein by reference.  
     TECHNICAL FIELD  
      The present invention relates to an image reading device capable of performing a document-feed reading operation for reading an image of a document while feeding the document and a document-fixed reading operation for reading an image of a document fixedly placed on a predetermined region of a flat bed unit and an image forming device having the image reading device.  
     BACKGROUND  
      A conventional image reading device have been provided with a transparent board, an image reading unit, a document conveying unit, and a document pick-up member. The transparent board has a document-feed reading region on which a document is conveyed and a document-fixed reading region on which the document is fixedly placed. The image reading unit is disposed blow the transparent board and selectively performs a document-feed reading operation for reading an image of the document conveyed on the document-feed reading region and a document-fixed reading operation for reading the image of the document placed on the document-fixed reading region. The document conveying unit conveys the document on the document-feed reading region in a document conveying direction from document-feed reading region to the document-fixed reading region. The document pick-up member is provided between the document-feed reading region and the document-fixed reading region. The document conveyed on the document-feed reading region contacts the document pick-up member and picked up by the document pick-up member. This type of image reading device can convey the document on the document-feed reading region of the transparent board by the document conveying unit and perform the document-feed reading operation for reading the image of the conveyed document or perform the document-fixed reading operation for reading the image of the document fixedly placed the document on the document-fixed reading region of the transparent board based on the user&#39;s request, In performing the document-feed reading operation, this type of image reading device conveys the document on the document-feed reading region in the document conveying direction by the document conveying unit. Then, the document is picked up by the document pick-up member and stacked on a upper side of the document-fixed reading region.  
      Here, the document pick-up member needs to be provided on the transparent board so as not to interfere conveyance of the document by the document conveying unit. Therefore, it is considered that the transparent board is divided into the document-feed reading region and the document-fixed reading region and a lower end portion, having a wedge-shaped cross section, of the document pick-up member is interposed between the document-feed reading region and the document-fixed reading region. Thus, the document conveyed on the transparent board is well picked up by an upper surface of the document pick-up member without being caught on the lower end portion of the document pick-up member.  
      However, when the transparent board is divided into two parts as described above, the document-feed reading region is supported by only three edges except an edge on which the document pick-up member is provided, thereby reducing strength of the document-feed reading region. That is, since the image reading unit such as a CIS needs to move lower portions of the document-feed reading region and the document-fixed reading member of the transparent board, the document-fixed reading member, having so large as to place all of predetermined size documents thereon, of the transparent board is supported only by the above-mentioned three edges. Accordingly, when the document such as a book is pressed against the document-fixed reading member, the document-fixed reading region of the transparent board may be bent downward, thereby interfering movement of the image reading unit. Japanese Patent Application Publication No. 2000-50025 discloses that the transparent board is formed with a groove between the document-feed reading region and the document-fixed reading region, and the lower end of the document pick-up member is disposed in the groove. The groove extends over the transparent board in a widthwise direction perpendicular to the document. conveying direction. Further, Japanese Patent Application Publication No. H11-136437 discloses that the transparent board is formed with a plurality of through-holes or recesses between the document-feed reading region and the document-fixed reading region, and a plurality of the pick-up member are provided to the plurality of through-holes or recesses.  
     SUMMARY  
      Forming the groove between the document-feed reading region and the document-fixed reading region, that is better than dividing the transparent board into two parts. However, since strength is reduced, the transparent board may be bent downward. When the plurality of pick-up member is provided on the transparent board, reduction in strength of the transparent board can be suppressed to some extent. However, when the document having a bent corner is conveyed, the bent part of the document comes into contact with a side surface of the document pick-up member and whole of the document cannot be picked up. As a result, the document cannot be conveyed.  
      In view of the foregoing, it is an object of the present invention to provide an image reading device capable of performing a document-feed reading operation and a document-fixed reading operation by providing a document-feed reading region and a document-fixed reading region on a transparent board, and to provide an image forming device having the image reading device capable of suppressing reduction in strength of a transparent board and picking up a document conveyed on the document-feed reading region in a document conveying direction.  
      To achieve the above and other objects, one aspect of the present invention provides an image reading device including a transparent board, a document conveying unit, and a document pick-up member.  
      The transparent board has a document-feed reading region on which a document is conveyed and a document-fixed reading region on which the document is fixedly placed. The transparent board has an upper surface when the transparent board is disposed in an orientation in which the transparent board is intended to be disposed. The document conveying unit conveys the document on the document-feed reading region in a document conveying direction from the document-feed reading region to the document-fixed reading region. A widthwise direction is defined perpendicular to the document conveying direction. The document pick-up member is provided between the document-feed reading region and the document-fixed reading region to pick up the document conveyed on the document-feed reading region upward to the upper surface of the transparent board.  
      The document pick-up member has an one end portion that is located on a document-feed reading region side thereof. The one end portion has a distal end positioned at a most upstream end of the one end portion in the document conveying direction. The distal end is located below the upper surface of the transparent board. The one end portion is inclined with respect to the widthwise direction from the distal end toward the downstream side in the document conveying direction.  
      In another aspect of the invention, there is provided an image forming device including a image reading device described above that reads a document and generates image data, and an image forming unit that forms an image on a recording medium based on the image data. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      In the drawings:  
       FIG. 1  is an perspective view showing configuration of an ink jet recording device according to an embodiment of the present invention;  
       FIG. 2  is a cross-sectional view showing the ink jet recording device according to the embodiment of the present invention;  
       FIG. 3  is a perspective view showing a cover unit of the ink jet recording as viewed from the rear side in  FIG. 1 ;  
       FIG. 4  is a cross-sectional view showing internal configuration of a scanner in the ink jet recording device according to the embodiment of the present invention;  
       FIG. 5  is an cross-sectional view showing a reading head of the scanner according to the embodiment of the present invention;  
       FIG. 6A  is a rear side view showing a platen glass and a document pick-up member of the scanner according to the embodiment of the present invention;  
       FIG. 6B  is a top view showing the platen glass and the document pick-up member of the scanner according to the embodiment of the present invention;  
       FIG. 6C  is a left side view showing the platen glass and the document pick-up member of the scanner according to the embodiment of the present invention;  
       FIG. 7A  is an enlarged cross-sectional view of a vicinity of a distal end taken along a line VIIA-VIIA in  FIG. 6B ;  
       FIG. 7B  is an enlarged cross-sectional view of the vicinity of the distal end taken along a line VIIB-VIIB in  FIG. 6B ;  
       FIG. 8A  is a plan view showing a flat bed unit including the platen glass and the document pick-up member according to the embodiment of the present invention;  
       FIG. 8B  is a perspective view showing the flat bed unit including the platen glass and the document pick-up member according to the embodiment of the present invention;  
       FIG. 9  is a perspective view showing a cover unit of the ink jet recording as viewed from the rear side according to another embodiment of the present invention;  
       FIG. 10A  is a rear side view showing a platen glass and a document pick-up member of the scanner according to another embodiment of the present invention;  
       FIG. 10B  is a top view showing the platen glass and the document pick-up member of the scanner according to another embodiment of the present invention;  
       FIG. 10C  is a left side view showing the platen glass and the document pick-up member of the scanner according to another embodiment of the present invention;  
       FIG. 11A  is an enlarged cross-sectional view of a vicinity of a distal end taken along the line XIA-XIA in  FIG. 10B ;  
       FIG. 11B  is an enlarged cross-sectional view of the vicinity of the distal end taken along the line XIB-XIB in  FIG. 10B ;  
       FIG. 12A  is a plan view showing a flat bed unit including the platen glass and the document pick-up member according to another embodiment of the present invention;  
       FIG. 12B  is a perspective view showing the flat bed unit including the platen glass and the document pick-up member according to another embodiment of the present invention;  
       FIG. 13A  is a rear side view showing a platen glass and a document pick-up member of the scanner according to another embodiment of the present invention;  
       FIG. 13B  is a top view showing the platen glass and the document pick-up member of the scanner according to another embodiment of the present invention;  
       FIG. 13C  is a left side view showing the platen glass and the document pick-up member of the scanner according to another embodiment of the present invention;  
       FIG. 14A  is an enlarged cross-sectional view of a vicinity of a distal end taken along the line XIVA-XIVA in  FIG. 13B ;  
       FIG. 14B  is an enlarged cross-sectional view of the vicinity of the distal end taken along the line XIVB-XIVB in  FIG. 13B ;  
       FIG. 15A  is a plan view showing a flat bed unit including the platen glass and the document pick-up member according to another embodiment of the present invention; and  
       FIG. 15B  is a perspective view showing the flat bed unit including the platen glass and the document pick-up member according to another embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION  
      Next, an image scanner and an image forming device according to an embodiment of the present invention will be described while referring to the accompanying drawings.  FIG. 1  is a perspective view showing of an ink jet recording device  1  according to the embodiment of the present invention.  FIG. 2  is a cross-sectional view of the ink jet recording device  1 . A document feeding unit  41  described later is omitted in  FIG. 2 .  
      The ink jet recorder  1  is a so-called Multi Function Device (MFD) having printing, copying, scanning and faxing functions. Sheet-like materials made of paper, plastic film and the like are used as recording mediums.  
      As shown in  FIGS. 1 and 2 , the ink jet recording device  1  has a case  1   a , a scanner  2 , and a recording unit  7 . The scanner  2  is disposed above the case  1   a . The recording unit  7  is disposed below the scanner  2  (in an upper section of the case  1   a ) The recording unit  7  forms an image on a recording sheet  20 , which is a recording medium, in above functions. A sheet feeder  30  is provided in a lower section of the case  1   a.    
      [Configuration of Recording Unit  7 ] 
      A box-like metal frame  5  is disposed above the sheet feeder  30  and in a rear section of the case  1   a . The frame  5  is a rectangular parallelepiped shape that is long in the left-to-right direction and that is short in the front-to-rear direction, and fixed in the case  1   a.    
      The recording unit  7  is disposed in an upper section of the frame  5 . The recording unit  7  includes a carriage  4   a  which mounts a recording head  4  that performs printing operation on the recording sheet  20 , and another mechanism. The carriage  4   a  can move reciprocally in the left-to-light direction (a scanning direction). In the recording unit  7 , the carriage  4   a  reciprocates in the left-to-light direction in  FIG. 1  (in a vertical direction with respect to the sheet of  FIG. 2 ), thereby performing scanning movement of the recording head  4 . During this scanning movement, the recording head  4  emits ink from a nozzle to record an image on the recording sheet  20  disposed below the recording head  4 .  
      A maintenance unit (not shown) is mounted at a position corresponding to a waiting position of the carriage  4   a  in the recording unit  7 . In the maintenance unit, various maintenance operations, such as a wiping operation for wiping a nozzle surface of the recording head  4  by a blade or the like, a purge operation for forcibly removing contaminant, air and solidified ink from the nozzle and a flushing operation, are carried out.  
      Four ink cartridges (not shown) are disposed in the front section of the case  1   a . The four ink cartridges store four colors (black, cyan, magenta, and yellow) of ink for forming a full-color image on the recording sheet  20 , respectively. These ink cartridges are detachably disposed in the case  1   a . When ink in the ink cartridges is empty, the ink cartridges are replaced.  
      The ink stored in each ink cartridge is supplied to the recording head  4  through four ink supply tubes  11  connecting the ink cartridges to the recording head  4 . The ink supply tubes  11  are supported so as to move following the reciprocating movement of the carriage  4   a.    
      A conveying path  5   a  for guiding the recording sheet  20  from the rear side of the sheet feeder  30  to the recording unit  7  is formed in the rear side of the frame  5 . The recording unit  7  has a conveying roller  7   a  and an ejecting roller  7   b . The conveying roller  7   a  is located at a position adjacent to an exit of the conveying path  5   a . The ejecting roller  7   b  is located at a position where the recording sheet  20  that an image is recorded thereon is emitted from the recording unit  7 . The conveying roller  7   a  is rotated by a rotational driving force of a sheet conveying motor (not shown).  
      A long arm  10  is disposed rear and bottom section of the case  1   a . The arm is pivotably supported about a driving shaft  9 . A sheet feed roller  8  is rotatably supported on the rear end of the arm  10 . When the driving shaft  9  is rotated by a rotational driving force of a sheet feeding motor (not shown), the rotational driving force is transmitted to the sheet feeding roller  8 , thereby rotating the sheet feeding roller  8 .  
      The sheet feeder  30  has a sheet feeding cassette  3  which is inserted from an opening  1   b  of the case  1   a . The sheet feeding cassette  3  is provided with a sheet storage unit  3   a  for storing stacked recording sheets  20  therein. When the sheet feeding cassette  3  is inserted into the case  1   a , the recording sheets  20  in the sheet storage unit  3   a  are located in the rear section of the case  1   a.    
      The topmost sheet of the recording sheets  20  stacked in the sheet storage unit  3   a  is sent to the recording unit  7  through the conveying path  5   a  by rotation of a sheet feeding roller  8 .  
      An operation panel  6  including various operation buttons and a liquid crystal panel is provided on the upper front surface of the ink jet recording device  1 . By using the operation panel  6 , the user can select any of a printing mode, a copying mode, a scanning mode and a faxing mode in the ink jet recording device  1 , set various setting items in the modes, input necessary information such as a facsimile number and the like, and confirm operating state, communications history and the like.  
      [Configuration of Scanner  2 ] 
      The scanner  2  can perform reading according to both the flat bed (FB) method and automatic document feeding (ADF) method. As shown in  FIG. 1 , the scanner  2  includes a cover unit  2   b , which has a clamshell configuration, provided on a flat bed unit  2   a  integral with the operation panel  6 . The cover unit  2   b  is capable of opening and closing over the flat bed unit  2   a . The document feeding unit  41  is provided at the left section of the cover unit  2   b  so as to protrude upward from the cover unit  2   b . A document feeding tray  42  is provided on the upper section of the document feeding unit  41 . The document feeding tray  42  is capable rotating about a right end of the document feeding unit  41 .  
       FIG. 3  is a perspective view showing the cover unit  2   b  as viewed from the rear side in  FIG. 1 . As shown in  FIG. 3 , the document feeding tray  42  can be opened. When the document feeding tray  42  is opened, a pair of document guides  43  (only one is shown in  FIG. 3 ) is exposed. The pair of document guides  43  are coupled to each other by a link (not shown) and move along document guide grooves  43   a  symmetrically about a center of the document feeding unit  41  in a direction (hereinafter referred to as the widthwise direction) perpendicular to a document conveying direction of the document feeding tray  42 . That is, the pair of document guides  43  move toward and away from each other in the widthwise direction for adjusting both a distance therebetween.  
       FIG. 4  is a cross-sectional view showing an internal configuration of the scanner  2 . As shown in  FIG. 4 , the document feeding unit  41  has a separating pad  44 , a separating roller  45 , a preliminary feeding roller  46 , and a document feeding roller  47 . The separating roller  45  is disposed above and in confrontation with separating pad  44 . The separating roller  45  pinches a document with the separating pad  44  and separates the documents stacked on the document feeding tray  42  one sheet at a time. The preliminary feeding roller  46  is disposed right side of the separating roller  45 . The preliminary feeding roller  46  conveys a front end of the document disposed between the pair of document guides  43  to between the separating pad  44  and the separating roller  45 . The document feeder  47  is provided at a downstream side of the separating roller  45  in the document conveying direction. The document feeder  47  conveys the document on a platen glass  51  described later while changing a conveying direction of the document by  180  degrees. Thus, the document disposed on the document feeding tray  42  opened as described above is separated one by one by the preliminary feeding roller  46  and the separating roller  45  and then sent to the document feeding roller  47 .  
      The cover unit  2   b  includes a document pick-up member  52 , a guide  53 , a document ejecting roller  54 , and a document ejecting tray  55 . The document pick-up member  52  is disposed the downstream side of the document feeder  47  in the document conveying direction. The guide  53  slants upward from the left side toward the right side. A left end of the guide  53  is located adjacent to the document pick-up member  52 . The document ejecting roller  54  is disposed adjacent to a right end of the guide  53 . The document ejecting tray  55  is positioned at an upper surface of the cover unit  2   b . The document ejecting tray  55  has a document receiver  55   a  provided at the right end of the document ejecting tray  55 . The document receiver  55   a  prevents the document from falling off the document ejecting tray  55 .  
      The document is conveyed on the document-feed reading region  51   a  described later of the platen glass  51  by the document feeding roller  47  and further conveyed to the sheet ejecting roller  54  via the document pick-up member  52  and the guide  53 . The conveyed document is further conveyed by the sheet ejecting roller  54  and ejected to the document ejecting tray  55 .  
      The platen glass  51  includes the document-feed reading region  51   a  and a document-fixed reading region  51   b . In the document-feed reading region  51   a , the document is read by the document feeding unit  41  and a reading head  61  described later according to the automatic document feeding method. In the document-fixed reading region  51   b , the document is scanned according to the flat bed method. As shown in  FIGS. 7A and 7B , the platen glass  51  is formed with a recess  51   c . The recess  51   c  is formed between the document-feed reading region  51   a  and the document-fixed reading region  51   b  and at the center of the platen glass  51  in the widthwise direction. The recess  51   c  is shaped like a cylinder with a constant depth.  
      As shown in  FIG. 4 , the document pick-up member  52  is provided between the document-feed reading region  51   a  and the document-fixed reading region  51   b . Furthermore, the reading head  61  is located under the platen glass  51 . The reading head  61  can move over the document-feed reading region  51   a  and the document-fixed reading region  51   b  along a guide  60 . As shown in  FIG. 5 , the reading head  61  has an image device  63 , a selfoc lens  64  and a light source  65 . The reading head  61  is configured so that the light source  65  irradiates light to the document on the platen glass  51 , the selfoc lens  64  receives reflected light from the document and forms an image on the image device  63 , and image device  63  scans the image.  
      [Configuration and Effects of Document Pick-Up Member] 
       FIGS. 6A through 6C  are three sides view showing configuration of the platen glass  51  and the document pick-up member  52 .  FIGS. 6A through 6C  shows a rear side view, a top view and a left side view of the platen glass  51  and the document pick-up member  52 , respectively.  FIG. 7A  is an enlarged cross-sectional view of a vicinity of a distal end  52   a  described later taken along a line VIIA-VIIA in  FIG. 6B .  FIG. 7B  is an enlarged cross-sectional view of a vicinity of the distal end  52   a  taken along a line VIIB-VIIB in  FIG. 6B .  
      The document pick-up member  52  has a left end portion  52   b , and a right end portion  52   c . The left end portion  52   b  has the distal end  52   a  at a most upstream end of the left end portion  52   b . The distal end  52   a  is located at the center of the document pick-up member  52  in the widthwise direction. As shown in  FIGS. 7A , and  7 B, the distal end  52   a  is located in the recess  51   c . That is, the distal end  52   a  is located below an upper surface  51   d  of the platen glass  51 . The left end portion  52   b  of the document pick-up member  52  is inclined with respect to the widthwise direction from the distal end  52   a  toward the right side (the downstream side in the document conveying direction). The left end portion  52   b  is inclined symmetrically about the distal end  52   a  in the widthwise direction.  
      Furthermore, as shown in  FIG. 7B , the left end portion  52   b  have a tapered face  52   d  slanting upward from the left side toward the right side. That is, the tapered face  52   d  slants gradually upwardly toward the downstream side in the document conveying direction. The left portion of the tapered face  52   d  is located inside the recess  51   c  and below the upper surface  51   d  of the platen glass  51 . The right end portion  52   c  of the document pick-up member  52  has a rectangular surface which is parallel to the widthwise direction and perpendicular to the platen glass  51 , and a top surface  52   e  which is parallel to the upper surface  51   d  of the platen glass  51 .  
      Refer to  FIGS. 8A and 8B  as a plan view and a perspective view, respectively, of the flat bed unit  2   a  including the platen glass  51  and the document pick-up member  52  in the state that the cover unit  2   b  is removed.  
      In the cover unit  2   b  of the scanner  2 , a document conveyed on the document-feed reading region  51   a  by the document feeding roller  47  as described above can be well picked up by the document pick-up member  52  as follows. That is, since the left end portion  52   b  is inclined with respect to the widthwise direction from the distal end  52   a  toward the right side and is inclined symmetrically about the distal end  52   a  in the widthwise direction, even when the document conveyed on the document-feed reading region  51   a  by the document feeding roller  47  is conveyed tilting a little with respect to a direction from the document-feed reading region to the document-fixed reading direction or has a bent corner, the document first comes into contact with the distal end  52   a . As described above, since the distal end  52   a  is located below the upper surface  51   d  of the platen glass  51  and the left side of the tapered face  52   d  is located inside the recess  51   c , the document can be picked up without being caught on the document pick-up member  52 .  
      Then, whole of the document is picked up along the tapered face  52   d  and the top surface  52   e  of the right end portion  52   c . Furthermore, since the top surface  52   e  of the right end portion  52   c  is parallel to the upper surface  51   d  of the platen glass  51 , the leading edge of the picked up document is also parallel to the upper surface  51   d  of the platen glass  51 . Accordingly, the document can be smoothly guided to the guide  53  and document ejecting roller  54 .  
      In the preferred embodiment, since the platen glass  51  is formed with the recess  51   a , the document pick-up member  52  having the distal end  52   a  can be attached as described above. It is unnecessary to divide the platen glass  51  into two parts or form a groove extending over the platen glass  51  in the widthwise direction. Thus, strength of the platen glass  51  can be ensured and production cost of the platen glass  51  can be reduced. Accordingly, even when a book or the like is pressed against the document-fixed reading region  51   b , the reading head  61  can be smoothly moved. The recess  51   c  is formed in the platen glass  51  in the preferred embodiment described above, but a though hole may be formed in the platen glass  51 .  
      While the invention has been described in detail with reference to specific embodiments thereof, it would be apparent to those skilled in the art that many modifications and variations may be made therein without departing from the spirit of the invention, the scope of which is defined by the attached claims.  
      While the distal end  52   a  is located at the center of the document pick-up member  52  in the widthwise direction in the preferred embodiment described above, for example, the distal end  52   a  may be provided on the document pick-up member  52  within a region corresponding to a minimum width of a document which is capable of being guided by the document guides  43  (preferably, any position other than the both ends of the minimum-width document in the widthwise direction). The minimum width of the document is a distance that the pair of document guide  43  move toward most each other. In this configuration, various documents can be well picked up as described above. Since the distal end  52   a  is located into the recess  51   c , a position of the recess Sic is also determined by determining the position of the distal end  52   a . Accordingly, it is preferable that the recess  51   c  is also disposed within a range corresponding to the minimum width of the document which is capable of being guided by the document guides  43  (preferably, any position other than the both ends of the minimum-width document in the widthwise direction).  
      While the pair of the document guides  43  is provided on the document feeding unit  41  in the preferred embodiment described above, as shown in  FIG. 9 , only one document guide  43  moving along the document guide groove  43   a  may be provided on the document feeding unit  41 . A document passes between the document guide  43  and a rear side wall  48  of the document feeding unit  41 . In this case, as shown in  FIGS. 10A through 12B , a distal end  152   a  may be located on the rear side of a document pick-up member  152  corresponding to the rear side wall  48  side of the document feeding unit  41  (a side where the document guide  43  does not provided). The distal end  152   a  and the document pick-up member  152  correspond to the distal end  52   a  and the document pick-up member  52  in the preferred embodiment described above. Since the rear edge of the document constantly passes the rear side wall  48  side of the document feeding unit  41  and the distal end  152   a  is located at the rear side of the document pick-up member  152 , similar effects as those in the preferred embodiment described above can be obtained. As shown in  FIGS. 10A through 12B , in this case, a left end portion  152   b  extends in a straight line and is inclined with respect to the widthwise direction. The left end portion  152   b  corresponds to the left end portion  52   b  in the preferred embodiment described above.  
       FIG. 10A  to  FIG. 12B  correspond to  FIG. 6A  to  FIG. 8B  in the preferred embodiment described above, respectively.  FIGS. 10A through 10C  shows a rear side view, a top view and a left side view of the platen glass  51  and the document pick-up member  152 , respectively.  FIG. 11A  is an enlarged cross-sectional view of a vicinity of the distal end  152   a  taken along the line XIA-XIA in  FIG. 10B . FIG.,  11 B is an enlarged cross-sectional view of a vicinity of the distal end  152   a  taken along the line XIB-XIB in  FIG. 10B .  FIGS. 12A and 12B  as a plan view and a perspective view, respectively, of the flat bed unit  2   a  including the platen glass  51  and the document pick-up member  152  in the state that the cover unit  2   b  is removed.  
      While the distal end  52   a  is provided on the document pick-up member  52  at the center in the widthwise direction in the preferred embodiment described above, as shown in  FIGS. 13A through 15B , a distal end  252   a  may be located on a document pick-up member  252  at a position corresponding to any position other than both ends of the minimum-width document in the widthwise direction (preferably, in a vicinity of the center of the minimum-width document in the widthwise direction). The distal end  252   a  and the document pick-up member  252  correspond to the distal end  52   a  and the document pick-up member  52  in the preferred embodiment described above.  
      In this case, as compared with the case where the distal end  152   a  is located at the rear side of the document pick-up member  152  as described above, a document conveyed on the document-feed reading region  51   a  can be well picked up by the document pick-up member  252 , even when the document conveyed on the document-feed reading region  51   a  by the document feeding roller  47  is conveyed tilting a little with respect to the direction from the document-feed reading region to the document-fixed reading direction or has a bent corner.  
       FIG. 13A  to  FIG. 15B  correspond to  FIG. 6A  to  FIG. 8B  in the preferred embodiment described above, respectively.  FIGS. 13A through 13C  shows a rear side view, a top view and a left side view of the platen glass  51  and the document pick-up member  252 , respectively.  FIG. 14A  is an enlarged cross-sectional view of a vicinity of the distal end  252   a  taken along the line XIVA-XIVA in  FIG. 13B .  FIG. 14B  is an enlarged cross-sectional view of a vicinity of the distal end  252   a  taken along the line XIVB-XIVB in  FIG. 13B .  FIGS. 15A and 15B  as a plan view and a perspective view, respectively, of the flat bed unit  2   a  including the platen glass  51  and the document pick-up member  252  in the state that the cover unit  2   b  is removed.  
      In the above embodiments, the present invention is applied to the multi function device having the copying function of forming an image by the recording unit  7  based on the image of the document read by the scanner  2 . However, the present invention can be also applied to a scanner without the image forming unit.