JP6589528B2 - Inkjet recording device - Google Patents

Description

  The present invention relates to an inkjet recording apparatus that records an image on a sheet by ejecting ink droplets from nozzles provided in a recording unit.

  In the ink jet recording apparatus, when so-called borderless printing is performed in which an image is recorded without providing a margin on the sheet, ink droplets are ejected to an outer region of the sheet. As a result, ink droplets that do not land on the sheet adhere to the platen that supports the sheet. Then, the ink may adhere to the back surface of the sheet that is transported next and supported by the platen, and the sheet may become dirty.

  In the image recording apparatus disclosed in Patent Document 1, the platen includes a bottom plate on which ribs for supporting the sheet are formed, and a downstream support portion disposed with a gap from the bottom plate in the conveyance direction. By supporting the sheet by the rib, it is possible to suppress the adhesion of the ink adhered to the bottom plate to the back surface of the sheet. In addition, the bottom plate is formed with an ink flow channel groove through which the ink attached to the bottom plate flows, and the ink attached to the bottom plate passes through the gap between the downstream support unit and the downstream support unit by the ink flow channel groove. It flows downward and is absorbed and captured by the ink absorber disposed below.

  In the image recording apparatus disclosed in Patent Document 1, one of the ribs provided on the bottom plate overlaps the downstream support portion in a side view so that the sheet does not enter the gap. Thereby, it is possible to suppress the sheet from entering the gap.

JP 2009-208245 A

  However, in the configuration as described above, the downstream end portion in the sheet conveyance direction is easily caught by the boundary portion between the bottom plate and the downstream support portion. When the sheet is continuously conveyed while being caught, the sheet is bent and lifted from the platen. As a result, the sheet may come into contact with the nozzles of the recording unit and become dirty, or the sheet may be jammed in the image recording apparatus. Such dirt and clogging of the sheet may occur when the flow direction of the sheet is a direction perpendicular to the sheet conveyance direction or when a large amount of ink droplets permeate the sheet, that is, the sheet floats from the platen. In particular, it tends to occur when it is easily bent.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an ink jet recording apparatus capable of suppressing the sheet supported by the support member that supports the sheet during image recording from being stained or clogged. It is in.

  (1) An inkjet recording apparatus according to the present invention includes a roller that conveys a sheet in the conveyance direction, a support member that is disposed downstream of the roller in the conveyance direction, and that supports the sheet, and above the support member And a recording unit that ejects ink droplets from a plurality of nozzles toward the support member. The support member includes a first rib extending from a landing area where ink droplets ejected by the recording unit land to a downstream side of the landing direction from the landing area, and a first rib in the conveying direction than the first rib. And a downstream support portion disposed with a gap in between the first rib. The first rib includes a first inclined surface formed at a downstream end portion in the transport direction and inclined downward toward the transport direction. The downstream support portion includes a second inclined surface that is inclined upward in the transport direction. The upstream end portion in the transport direction of the downstream support portion is located below the lower end of the first inclined surface. The virtual plane including the first inclined surface intersects the sheet support surface at the upstream end portion of the downstream support portion.

  According to this configuration, the sheet is guided along the first inclined surface toward the sheet support surface at the upstream end portion of the downstream support portion positioned below the lower end of the first inclined surface. As a result, even if the sheet is bent so as to be lifted from the support member, the lift of the sheet from the support member can be suppressed. As a result, it is possible to suppress sheet contamination due to contact of the sheet with the nozzles of the recording unit and clogging of the sheet in the ink jet recording apparatus.

  Moreover, the virtual surface including the first inclined surface intersects the sheet support surface at the upstream end portion of the downstream support portion. For this reason, the sheet guided along the first inclined surface comes into contact with the sheet support surface and is guided along the sheet support surface. Therefore, the possibility that the sheet enters the gap between the first rib and the downstream support portion can be reduced.

  (2) The downstream support portion includes a concave portion that is recessed in the transport direction from a position facing the first rib at an upstream end in the transport direction.

  According to this structure, when a downstream support part is provided with a recessed part, it can prevent that the clearance gap between a 1st rib and a downstream support part becomes narrow too much. As a result, it is possible to reduce the possibility that the ink ejected from the nozzles and attached to the first rib adheres to the downstream support portion.

  (3) The virtual surface intersects the sheet support surface downstream of the concave portion in the transport direction.

  According to this configuration, the possibility that the sheet enters the gap between the first rib and the downstream support portion can be further reduced.

  (4) The first rib has a tapered shape that tapers upward.

  According to this configuration, since the upper end surface of the first rib such as the first inclined surface that is a portion in contact with the sheet in the first rib is reduced, the adhesion of the ink attached to the first rib to the sheet is suppressed. Can do.

  (5) The upstream end of the first inclined surface in the transport direction is located upstream of the nozzles located on the most downstream side in the transport direction among the plurality of nozzles.

  According to this configuration, the distance between the support member and the recording unit is increased at the downstream end in the transport direction in the landing area. Thereby, even if the sheet is curved, it is possible to suppress the sheet from rising from the support member at the downstream end portion in the conveyance direction in the landing area.

  (6) The support member is disposed below the downstream end portion of the first rib, and receives the storage portion from which the ink absorbing member is stored and the downstream end of the first rib in the transport direction. A second rib extending downward toward the portion.

  According to this configuration, the ink attached to the first rib can be easily fed into the ink absorbing member.

  (7) The support member extends from at least the upstream end and the downstream end in the transport direction of the first rib to the upstream in the transport direction from the first rib, and has a width orthogonal to the transport direction. A plurality of third ribs arranged at intervals in the direction are provided. The ink jet recording apparatus is positioned between the third ribs adjacent in the width direction, upstream of the nozzle in the transport direction, and comes into contact with the sheet supported by the support member from above. A contact portion for providing the sheet with a wave shape along the width direction in cooperation with the third rib. The third rib is disposed at a position different from the first rib in the width direction. In the width direction, at least a part of a position range occupied by at least one of the first ribs and the contact portion overlaps.

  According to this configuration, the corrugated valley portion of the sheet provided by the third rib and the contact portion is supported by the first rib. For this reason, it can suppress that the part of the said valley is located below rather than the 1st rib. As a result, it is possible to suppress ink from adhering to the sheet.

  (8) The sheet support surface includes a plane extending along the transport direction at the upstream end. The second inclined surface is provided downstream of the plane in the transport direction. The virtual plane intersects the plane.

  According to this configuration, since the sheet is guided from the first inclined surface to the second inclined surface through a plane, the sheet is smoother than when the sheet is guided directly from the first inclined surface to the second inclined surface. To the second inclined surface.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that the sheet | seat supported by the supporting member becomes dirty or clogged.

FIG. 1 is a perspective view of a multifunction machine 10 as an example of an embodiment of the present invention. FIG. 2 is a longitudinal sectional view schematically showing the internal structure of the printer unit 11. FIG. 3 is a perspective view showing the platen 42, the contact member 81, and the discharge roller pair 44. FIG. 4 is a perspective view showing the upstream support portion 77, the contact member 81, and the discharge roller pair 44. FIG. 5 is a plan view showing the platen 42, the contact member 81, and the discharge roller pair 44. 6 is a cross-sectional view taken along the line VI-VI in FIG. FIG. 7 is a cross-sectional view schematically showing the platen 42, the contact member 81, and the paper 12.

  Hereinafter, embodiments of the present invention will be described. The embodiment described below is merely an example of the present invention, and it is needless to say that the embodiment of the present invention can be changed as appropriate without departing from the gist of the present invention. Further, in the following description, the upper direction 4 and the lower direction 5 are defined on the basis of the state in which the multifunction machine 10 is installed so as to be usable (state in FIG. 1), and the surface on which the opening 13 is provided is defined as the front surface 14. A forward direction 6 and a backward direction 7 are defined, and when the multifunction machine 10 is viewed in the backward direction 7, a right direction 8 and a left direction 9 are defined. The upward direction 4 and the downward direction 5 are opposite to each other. The forward direction 6 and the backward direction 7 are opposite to each other. The right direction 8 and the left direction 9 are opposite to each other. The upward direction 4, the forward direction 6, and the right direction 8 are orthogonal to each other.

[Overall structure of MFP 10]
As shown in FIG. 1, the multifunction machine 10 (an example of an ink jet recording apparatus) is generally formed in a thin rectangular parallelepiped. A printer unit 11 is provided in the lower part of the multifunction machine 10. The multifunction machine 10 has various functions such as a facsimile function and a print function. The multifunction machine 10 has a function of recording an image on one side of a sheet 12 (see FIG. 2, an example of a sheet) by an inkjet method as a print function. The multifunction machine 10 may record images on both sides of the paper 12.

[Feeding tray 20]
As shown in FIG. 1, an opening 13 is formed in the front of the printer unit 11. The feeding tray 20 can be inserted into and removed from the printer unit 11 through the opening 13 by moving in the forward direction 6 and the backward direction 7. The feeding tray 20 is a box-shaped member that is open at the top. As shown in FIG. 2, the paper 12 is supported in a state of being stacked on the bottom plate 22 of the feeding tray 20. A discharge tray 21 is supported above the front portion of the feeding tray 20. The discharge tray 21 moves in the forward direction 6 and the backward direction 7 together with the feeding tray 20. On the upper surface of the discharge tray 21, the paper 12 on which an image is recorded by the recording unit 24 is discharged.

[Feeding unit 16]
As shown in FIG. 2, the feeding unit 16 is disposed below the recording unit 24. The feeding unit 16 includes a feeding roller 25, a feeding arm 26, a drive transmission mechanism 27, and a shaft 28. The feed roller 25 is rotatably supported at the tip end portion of the feed arm 26. The feeding arm 26 rotates in the directions of arrows 29 and 30 around a shaft 28 provided at the base end. Thereby, the feeding roller 25 can be brought into contact with and separated from the feeding tray 20 or the paper 12 supported by the feeding tray 20.

  The feeding roller 25 is rotated by a driving force of a feeding motor (not shown) transmitted by a drive transmission mechanism 27 in which a plurality of gears are engaged. As a result, among the sheets 12 supported by the bottom plate 22 of the feeding tray 20, the uppermost sheet 12 that is in contact with the feeding roller 25 is fed to the conveyance path 65. The drive transmission mechanism 27 is not limited to a form in which a plurality of gears are meshed, and may be a belt spanned between the shaft 28 and the shaft of the feeding roller 25, for example.

[Conveyance path 65]
As shown in FIG. 2, a conveyance path 65 extends from the rear end portion of the feeding tray 20. The conveyance path 65 includes a curved portion 33 and a straight portion 34. The curved portion 33 extends so as to make a U-turn from the rear direction 7 to the front direction 6 while facing the upward direction 4. The straight portion 34 extends generally along the front direction 6 and the rear direction 7.

  The bending portion 33 is formed by an outer guide member 18 and an inner guide member 19 that face each other with a predetermined interval. Each of the guide members 18 and 19 extends in the right direction 8 (an example of the width direction) and the left direction 9 (an example of the width direction) that are orthogonal to the paper surface in FIG. The straight line portion 34 is formed by the recording portion 24 and the platen 42 facing each other with a predetermined interval at a position where the recording portion 24 is disposed.

  The sheet 12 supported by the feeding tray 20 is conveyed through the curved portion 33 by the feeding roller 25 and reaches a conveying roller pair 59 described later. The sheet 12 held between the pair of transport rollers 59 is transported in the forward direction 6 with the straight line portion 34 directed toward the recording unit 24. An image is recorded by the recording unit 24 on the sheet 12 that has arrived immediately below the recording unit 24. The sheet 12 on which the image is recorded is conveyed in the forward direction 6 through the linear portion 34 and discharged to the discharge tray 21. As described above, the sheet 12 is transported along the transport direction 15 indicated by the one-dot chain line arrow in FIG.

[Recording unit 24]
As shown in FIG. 2, the recording unit 24 is disposed above the linear part 34. A platen 42 (an example of a support member) that supports the sheet 12 conveyed in the conveyance direction 15 along the linear portion 34 of the conveyance path 65 is disposed below the linear portion 34 and at a position facing the recording unit 24. The platen 42 will be described in detail later.

  The recording unit 24 includes a carriage 40 and a recording head 38. The carriage 40 is supported so as to be movable along the right direction 8 and the left direction 9 by two guide rails 56 and 57 that are spaced apart in the front direction 6 and the rear direction 7. The guide rail 56 is disposed upstream of the recording head 38 in the transport direction 15. The guide rail 57 is disposed downstream of the recording head 38 in the transport direction 15. The guide rails 56 and 57 are supported by a pair of side frames (not shown) arranged outside the straight portion 34 of the conveyance path 65 in the right direction 8 and the left direction 9. The carriage 40 moves when a driving force is applied from a carriage drive motor (not shown).

  The recording head 38 is mounted on the carriage 40. Ink is supplied to the recording head 38 from an ink cartridge (not shown). A plurality of nozzles 39 are formed on the lower surface of the recording head 38. When the carriage 40 moves in the right direction 8 and the left direction 9, the recording head 38 ejects ink droplets from the nozzles 39 toward the platen 42. As a result, the linear portion 34 is conveyed in the conveyance direction 15 and an image is recorded on the paper 12 supported by the platen 42.

[Conveying roller pair 59 and discharging roller pair 44]
As shown in FIG. 2, a conveying roller pair 59 is disposed upstream of the recording head 38 and the platen 42 in the linear portion 34 in the conveying direction 15. A discharge roller pair 44 is disposed downstream of the recording head 38 in the linear portion 34 in the transport direction 15.

  The conveyance roller pair 59 includes a conveyance roller 60 (an example of a roller) and a pinch roller 61 disposed below the conveyance roller 60 and facing the conveyance roller 60. The conveyance roller 60 is a hollow and cylindrical member extending in the right direction 8 and the left direction 9. The transport roller 60 is rotatably supported by a pair of side frames (not shown). A plurality of pinch rollers 61 are provided at intervals in the right direction 8 and the left direction 9. The pinch roller 61 is pressed against the transport roller 60 by an elastic member (not shown) such as a coil spring. The transport roller pair 59 can sandwich the paper 12.

  The discharge roller pair 44 includes a discharge roller 62 and a spur roller 63 disposed above the discharge roller 62 so as to face the discharge roller 62. As shown in FIG. 4, the discharge roller 62 includes a shaft 64 extending in the right direction 8 and the left direction 9, and a roller portion attached so as to cover the shaft 64 with an interval in the right direction 8 and the left direction 9. 58. The discharge roller 62 is rotatably supported by a pair of side frames. A plurality of spur rollers 63 shown in FIG. 2 are provided at intervals in the right direction 8 and the left direction 9. The spur roller 63 is pressed toward the discharge roller 62 by an elastic member (not shown) such as a coil spring. 3 to 6, illustration of the spur roller 63 is omitted. The discharge roller pair 44 can sandwich the paper 12.

  The conveyance roller 60 and the discharge roller 62 are rotated by a driving force applied from the conveyance motor. When the transport roller 60 rotates while the paper 12 is sandwiched between the transport roller pair 59, the paper 12 is transported in the transport direction 15 by the transport roller pair 59 and transported onto the platen 42. When the discharge roller 62 rotates in a state where the paper 12 is sandwiched between the discharge roller pair 44, the paper 12 is conveyed in the conveyance direction 15 by the discharge roller pair 44 and is discharged onto the discharge tray 21.

[Abutting member 81]
As shown in FIG. 2, a plurality of contact members 81 are disposed upstream of the nozzles 39 formed in the recording head 38 in the transport direction 15. The contact member 81 is formed of a synthetic resin (for example, polyacetal (POM)). The contact member 81 may be a combination of a plurality of members by fitting or the like.

  As shown in FIG. 3, a plurality of contact members 81 are arranged at intervals in the right direction 8 and the left direction 9. In the present embodiment, the number of contact members 81 is nine, but may be a number other than nine. Moreover, in this embodiment, although the three contact members 81 are connected, each contact member 81 may be independent.

  Each contact member 81 is attached to the guide rail 56 by a known means such as fitting at the upstream end 81B in the transport direction 15.

  Each contact member 81 is curved downward and forward from the upstream end portion 81B. Thereby, each contact member 81 is extended to the upstream vicinity of the conveyance direction 15 of the nozzle 39 arrange | positioned most upstream among the some nozzles 39. FIG. Each contact member 81 is extended toward the platen 42 in the upper direction 4 and the lower direction 5. The downstream end portion 81 </ b> A (an example of the contact portion, see FIG. 2) of each contact member 81 in the transport direction 15 can contact the upper surface of the paper 12 supported by the platen 42.

[Platen 42]
As shown in FIGS. 3 and 4, the platen 42 includes an upstream support portion 77, a downstream support portion 78, and a storage portion 79.

[Upstream support part 77]
The upstream support portion 77 is disposed upstream of the downstream support portion 78 in the transport direction 15.

  As shown in FIG. 3, the upstream support portion 77 is a plate-shaped member in which the right direction 8 and the left direction 9 and the front direction 6 and the rear direction 7 are longer than the lengths of the upper direction 4 and the lower direction 5. The lengths of the upstream support portion 77 in the right direction 8 and the left direction 9 are longer than the lengths of the front direction 6 and the rear direction 7. The upstream support portion 77 is disposed to face the nozzles 39 formed in the recording head 38.

  As shown in FIG. 4, the upstream support portion 77 includes a convex portion 73 protruding in the transport direction 15 at the downstream end in the transport direction 15. A plurality of the convex portions 73 are provided at intervals in the right direction 8 and the left direction 9. Each of the convex portions 73 is in contact with the shaft 64 of the discharge roller 62 from three positions on the right in the right direction 8 and the left direction 9, obliquely above the transport direction 15, downstream in the transport direction 15, and below. . Here, as described above, the discharge roller 62 is rotatably supported by the pair of side frames, that is, the frame of the multifunction machine 10. Accordingly, the upstream support portion 77 is positioned by the frame of the multifunction machine 10 via the discharge roller 62 at the downstream end portion in the transport direction 15.

  Further, the upstream support portion 77 includes a convex portion 72 that protrudes in the direction opposite to the transport direction 15 at the upstream end in the transport direction 15. A plurality of convex portions 72 are provided in the right direction 8 and the left direction 9 with an interval therebetween. One end of a coil spring (not shown) is in contact with the lower surface of each convex portion 72. The other end of the coil spring is connected to a frame (not shown) of the multifunction machine 10. On the other hand, protrusions (not shown) protruding from the frame of the multifunction machine 10 are arranged above the protrusions 72 located at both ends of the right direction 8 and the left direction 9 among the protrusions 72. And the convex part 72 located in the both ends of the right direction 8 and the left direction 9 is contact | abutted by the protrusion from the downward direction by being urged | biased by a coil spring. Thus, the upstream support portion 77 is positioned by the frame of the multifunction machine 10 at the upstream end portion in the transport direction 15.

  As shown in FIGS. 3 and 4, the upper surface 80 of the upstream support portion 77 is a surface that extends in the front direction 6 and the rear direction 7, and in the right direction 8 and the left direction 9. The upper surface 80 includes a first region 80A, a second region 80B, and a third region 80C. The first area 80 </ b> A is an area located directly below the periphery of the end of the sheet 12 in the transport direction 15 when so-called borderless printing is performed in which the recording unit 24 ejects ink droplets to the end of the sheet 12. The second area 80B is an area located immediately below the right edge and the left edge of the paper 12 of various sizes that are set to be printable in the multifunction machine 10 when borderless printing is executed. The third area 80 </ b> C is an area that is located at a position other than the end of the sheet 12 in the transport direction 15 and the position immediately below the right end and the left end when printing is executed. When borderless printing is executed, ink droplets are landed and attached to a part of the first region 80A and the second region 80B (portion where the paper 12 is not supported). The position of the second region 80B is a position that is one step lower than the first region 80A and the third region 80C. In other words, the second region 80B is located below the first region 80A and the third region 80C.

  The first area 80A is an area downstream of the third area 80C in the transport direction 15. The upstream end of the first area 80 </ b> A in the transport direction 15 is located between the nozzle 39 located on the most upstream side in the transport direction 15 and the nozzle 39 located on the most downstream side among the plurality of nozzles 39 of the recording head 38. Yes. The downstream end of the first area 80 </ b> A in the transport direction 15 is substantially the same position as the nozzle 39 located most downstream in the transport direction 15 among the plurality of nozzles 39 of the recording head 38. In FIG. 6, the position of the nozzle 39 located on the most downstream side in the transport direction 15 is shown as a position 71.

  The upstream end of the second area 80 </ b> B in the transport direction 15 is located upstream of the nozzles 39 of the recording head 38 in the transport direction 15. The downstream end of the second region 80 </ b> B in the transport direction 15 is substantially the same position as the position 71 of the nozzle 39 located most downstream in the transport direction 15 among the plurality of nozzles 39 of the recording head 38.

  The upstream end of the third region 80 </ b> C in the transport direction 15 is located upstream of the nozzle 39 of the recording head 38 in the transport direction 15. The downstream end of the third region 80C in the transport direction 15 is located between the nozzle 39 located at the most upstream position in the transport direction 15 and the nozzle 39 at the most downstream position 71 among the plurality of nozzles 39 of the recording head 38. ing.

  A plurality of upstream ribs 76 (an example of third ribs) and a plurality of downstream ribs 75 (an example of first ribs) are formed on the upper surface 80 of the upstream support portion 77. The plurality of upstream ribs 76 and the plurality of downstream ribs 75 support the paper 12 by their upper end surfaces. As a result, the adhesion of the ink attached to the first region 80A and the second region 80B of the upper surface 80 to the lower surface of the paper 12 is reduced. The upstream rib 76 and the downstream rib 75 will be described in detail later.

  As shown in FIG. 6, the accommodating portion 79 extends from the downstream end of the upper surface 80 in the transport direction 15. The accommodating portion 79 is arranged from below the downstream end portion of the downstream rib 75 in the transport direction 15 to below the downstream support portion 78. The accommodating portion 79 includes a side surface 79A extending downward 5 from the downstream end in the transport direction 15 of the upper surface 80, a bottom surface 79B extending from the lower end of the side surface 79A in the transport direction 15, and a downstream end of the bottom surface 79B in the transport direction 15. It is a recess defined by a side surface 79 </ b> C extending in the upward direction 4. The side surfaces 79 </ b> A and 79 </ b> C are surfaces that expand in the upward direction 4 and the downward direction 5, and in the right direction 8 and the left direction 9. The bottom surface 79 </ b> B is a surface that extends in the front direction 6 and the rear direction 7, and in the right direction 8 and the left direction 9.

  As shown in FIGS. 4 and 6, the ink absorbing member 82 is accommodated in the accommodating portion 79. The ink absorbing member 82 is made of a porous material such as foamed polyurethane.

  The upper surface 80 of the upstream support part 77 is slightly inclined downward 5 toward the transport direction 15. As a result, the ink attached to the upper surface 80 (the first region 80A and the second region 80B) flows in the transport direction 15. Thereafter, the ink flows along the side surface 79 </ b> A and is guided to the ink absorbing member 82. The ink is absorbed by the ink absorbing member 82 by entering the holes formed in the porous material.

  A plurality of extension ribs 74 (an example of second ribs) are formed on the front surface of the upstream support portion 77, that is, on the side surface 79 </ b> A of the housing portion 79. The extension rib 74 will be described in detail later.

[Downstream support part 78]
As shown in FIG. 3, the downstream support portion 78 is a plate-shaped member in which the right direction 8 and the left direction 9 and the front direction 6 and the rear direction 7 are longer than the lengths of the upper direction 4 and the lower direction 5. The lengths of the downstream support portion 78 in the right direction 8 and the left direction 9 are longer than the lengths of the front direction 6 and the rear direction 7. The downstream support portion 78 is supported by a pair of side frames at the right end portion and the left end portion.

  As shown in FIG. 6, the downstream support portion 78 is disposed downstream of the downstream rib 75 and the extension rib 74 provided in the upstream support portion 77 in the transport direction 15.

  The downstream support part 78 is disposed with a gap between the downstream support part 77 and the upstream support part 77. Specifically, a gap is formed along the transport direction 15 between the upstream end portion 83 of the downstream support portion 78 in the transport direction 15 and the downstream end portion 85 of the upstream support portion 77 in the transport direction 15. .

  The upstream end portion 83 in the transport direction 15 of the downstream support portion 78 is positioned below the lower end of the inclined surface 86 of the downstream rib 75 described later. Further, the upstream end 83 is located above the accommodating portion 79.

  As shown in FIGS. 3 and 6, the upper surface 84 (an example of a sheet support surface) of the downstream support portion 78 is a surface that supports the paper 12, and includes a flat surface 84 </ b> A and an inclined surface 84 </ b> B (an example of a second inclined surface). And a plane 84C.

  The flat surface 84 </ b> A is a surface formed upstream of the discharge roller pair 44 in the transport direction 15. The flat surface 84 </ b> A is formed at the upstream end portion 83 of the downstream support portion 78. The plane 84A is a surface that extends in the front direction 6 and the rear direction 7, and the right direction 8 and the left direction 9. That is, the flat surface 84 </ b> A is a surface extending along the transport direction 15. The flat surface 84 </ b> A is located below the lower end of the inclined surface 86 of the downstream rib 75.

  The inclined surface 84B is a surface formed upstream of the discharge roller pair 44 in the transport direction 15. The inclined surface 84B is formed downstream of the plane 84A in the transport direction 15. In the present embodiment, the inclined surface 84B is a surface that is continuous with the downstream end in the transport direction 15 of the flat surface 84A. The inclined surface 84B may not be continuous with the downstream end of the flat surface 84A in the transport direction 15. The inclined surface 84B is inclined upward in the transport direction 15. The inclined surface 84B is a surface that extends in the direction of the inclination and the right direction 8 and the left direction 9.

  The flat surface 84 </ b> C is a surface formed downstream of the discharge roller pair 44 in the transport direction 15 and supports the paper 12 that has passed through the discharge roller pair 44. The plane 84 </ b> C is a surface that extends in the front direction 6 and the rear direction 7, and in the right direction 8 and the left direction 9.

  As shown in FIGS. 3 and 5, the downstream support portion 78 has a recess 70. The recess 70 is recessed in the transport direction 15 from the upstream end of the downstream support portion 78 in the transport direction 15. The recess 70 is formed on the flat surface 84 </ b> A when the downstream support portion 78 is viewed from above, that is, when the downstream support portion 78 is viewed in the downward direction 5. A plurality of the recesses 70 are formed at intervals in the right direction 8 and the left direction 9. The recess 70 faces the downstream rib 75 in the transport direction 15. The downstream rib 75 is located between the right end and the left end of the recess 70 in the right direction 8 and the left direction 9.

  As shown in FIG. 3, the recess 70 divides the right side 70 </ b> A that defines the right end, the left side 70 </ b> B that defines the left end, and the downstream end in the transport direction 15, and connects the right side 70 </ b> A and the left side 70 </ b> B. It is partitioned by the back side surface 70C. In this embodiment, the distance along the right direction 8 and the left direction 9 between the right end of the downstream rib 75 and the right side surface 70A, and the distance along the right direction 8 and the left direction 9 between the left end of the downstream rib 75 and the left side surface 70B. And the distance along the transport direction 15 between the downstream end of the downstream rib 75 in the transport direction 15 and the rear side surface 70C is the front surface of the upstream support portion 77, that is, the side surface 79A of the accommodating portion 79 (see FIG. 6). And the distance along the transport direction 15 between the downstream support portion 78 and the upstream end in the transport direction 15. Thereby, it is possible to prevent the gap between the downstream rib 75 and the downstream support portion 78 from becoming too narrow at the position where the downstream rib 75 protrudes from the side surface 79A in the transport direction 15.

[Upstream rib 76]
As shown in FIG. 3, the upstream rib 76 is formed on the upper surface 80 of the upstream support portion 77. The upstream rib 76 extends along the transport direction 15 from the upstream end in the transport direction 15 of the third region 80C to the downstream end of the transport direction 15 of the third region 80C. In other words, the upstream rib 76 extends from the downstream in the transport direction 15 to the downstream end of the contact member 81 in the transport direction 15 (the downstream end of the downstream end portion 81 </ b> A in the transport direction 15). Extends along the conveying direction 15.

  As shown in FIGS. 3 and 5, a plurality of upstream ribs 76 are formed at intervals in the right direction 8 and the left direction 9. The upstream rib 76 is formed between the downstream end portions 81 </ b> A of the plurality of contact members 81 adjacent in the right direction 8 and the left direction 9. The upper end surface of the upstream rib 76 is located above the location where the downstream end portion 81 </ b> A of the contact member 81 contacts the upper surface of the paper 12.

  Since the upstream rib 76 is configured as described above, as shown in FIG. 7, the sheet is supported by the upper end surface of each upstream rib 76 and is in contact with the downstream end portion 81 </ b> A of each contact member 81. Reference numeral 12 denotes a wave shape continuous in the right direction 8 and the left direction 9. That is, the upstream rib 76 supports the paper 12 and cooperates with the downstream end 81 </ b> A of the contact member 81 to give the paper 12 a wave shape along the right direction 8 and the left direction 9.

[Downstream rib 75]
As shown in FIG. 3, the downstream rib 75 is formed on the upper surface 80 of the upstream support portion 77. The downstream rib 75 extends along the transport direction 15. As shown in FIGS. 3 and 5, a plurality of downstream ribs 75 are formed at intervals in the right direction 8 and the left direction 9. The protruding length of the downstream rib 75 in the upward direction 4 is shorter than the protruding length of the upstream rib 76 in the upward direction 4. That is, the upper end surface of the downstream rib 75 is positioned below the upper end surface of the upstream rib 76.

  Each downstream rib 75 is located between the right end and the left end of the downstream end portion 81 </ b> A of the contact member 81. In other words, the positions of the downstream ribs 75 in the right direction 8 and the left direction 9 correspond to the positions in the right direction 8 and the left direction 9 of the downstream end portion 81 </ b> A of the contact member 81. In other words, in the right direction 8 and the left direction 9, the position range occupied by each downstream rib 75 is included in the position range occupied by the downstream end portion 81 </ b> A of each contact member 81. As described above, the downstream rib 75 is arranged at a position different from the upstream rib 76 in the right direction 8 and the left direction 9.

  A part of the plurality of downstream ribs 75 (downstream ribs 75A and 75B in this embodiment) is between the upstream end and the downstream end in the transport direction 15 of the third region 80C, and the downstream end in the transport direction 15 of the first region 80A. It extends along the conveyance direction 15 further downstream. Specifically, the downstream ribs 75A and 75B are downstream of the contact member 81 in the transport direction 15 and upstream of the downstream end of the transport direction 15 of the third region 80C in the transport direction 15 of the first region 80A. It extends along the transport direction 15 from the downstream end to the downstream.

  Further, the downstream ribs 75 other than the downstream ribs 75A and 75B are transported from the upstream end of the first region 80A in the transport direction 15 to the downstream of the downstream end of the transport direction 15 in the first region 80A and the second region 80B. 15 extends.

  In this embodiment, 11 downstream ribs 75 are formed as shown in FIGS. 3, 4, and 5, but the number of downstream ribs 75 is not limited to 11. For example, only one downstream rib 75 may be formed at the center in the right direction 8 and the left direction 9 on the upper surface 80 of the upstream support portion 77.

  In addition, since the downstream rib 75 is configured as described above, the upstream rib 76 described above is at least between the upstream end and the downstream end in the transport direction 15 of the downstream rib 75, and more in the transport direction 15 than the downstream rib 75. It will extend to the upstream.

  In the present embodiment, all the downstream ribs 75 protrude in the transport direction 15 from the downstream end in the transport direction 15 in the first region 80A. Here, as described above, the downstream end of the first region 80 </ b> A in the transport direction 15 is substantially the same position as the nozzle 39 at the most downstream position 71 in the transport direction 15 among the plurality of nozzles 39. Therefore, the downstream rib 75 extends further downstream in the transport direction 15 than the nozzle 39. Here, since the nozzle 39 discharges ink droplets in the downward direction 5, the region immediately below the nozzle 39 in the transport direction 15 is a landing region where the ink droplets land. Therefore, the downstream rib 75 is extended to the downstream of the conveyance direction 15 rather than the landing area | region.

  As shown in FIGS. 3 and 6, an inclined surface 86 (an example of a first inclined surface) is formed at the downstream end portion 85 of the downstream rib 75 in the conveying direction 15. The inclined surface 86 is inclined downward in the transport direction 15.

  As shown in FIG. 6, the upstream end of the inclined surface 86 in the transport direction 15 is located upstream of the nozzles 39 at the most downstream position 71 in the transport direction 15 among the plurality of nozzles 39. Since the inclined surface 86 is inclined downward in the conveying direction 15, the upstream end of the inclined surface 86 in the conveying direction 15 corresponds to the upper end of the inclined surface 86.

  The downstream end of the inclined surface 86 in the transport direction 15 is located downstream of the nozzles 39 at the most downstream position 71 in the transport direction 15 among the plurality of nozzles 39. Since the inclined surface 86 is inclined downward in the conveying direction 15, the downstream end of the inclined surface 86 in the conveying direction 15 corresponds to the lower end of the inclined surface 86. Further, the downstream end of the inclined surface 86 in the transport direction 15 corresponds to the downstream end of the downstream rib 75 in the transport direction 15.

  The downstream end of the inclined surface 86 in the transport direction 15 is located above the upstream end 83 of the downstream support portion 78 in the transport direction 15.

  The virtual surface 87 including the inclined surface 86 intersects the upper surface 84 at the upstream end 83 of the downstream support portion 78, in this embodiment, the flat surface 84 </ b> A of the downstream support portion 78. In the present embodiment, the virtual surface 87 passes through the recess 70 of the downstream support portion 78. That is, the virtual surface 87 intersects the flat surface 84 </ b> A upstream of the rear side surface 70 </ b> C of the recess 70 in the transport direction 15.

  The downstream rib 75 is configured such that the length in the right direction 8 and the left direction 9 decreases from the projecting base end to the projecting tip from the upstream end to the downstream end in the transport direction 15. That is, the downstream rib 75 has a tapered shape that tapers upward including a portion where the inclined surface 86 is formed.

[Extension rib 74]
As shown in FIGS. 4 and 6, the extension rib 74 is formed on the front surface of the upstream support portion 77, that is, on the side surface 79 </ b> A of the accommodating portion 79. The extension rib 74 protrudes in the transport direction 15 from the side surface 79A. The extension rib 74 extends along the upper direction 4 and the lower direction 5. A plurality of extension ribs 74 are formed at intervals in the right direction 8 and the left direction 9. The upstream end of the extension rib 74 in the transport direction 15 is connected to the downstream end of the downstream rib 75 in the transport direction 15. The extension rib 74 extends downward from the downstream end of the downstream rib 75 in the transport direction 15 toward the bottom surface 79 </ b> B of the housing portion 79. The extension rib 74 has a tapered shape that tapers toward the protruding tip, that is, toward the front.

[Effect of the embodiment]
According to the present embodiment, the sheet 12 is guided along the inclined surface 86 toward the upper surface 84 of the upstream end portion 83 of the downstream support portion 78 positioned below the lower end of the inclined surface 86. Thereby, even if the paper 12 is curved so as to be lifted from the platen 42, the lift of the paper 12 from the platen 42 can be suppressed. As a result, it is possible to suppress the contamination of the paper 12 due to the paper 12 coming into contact with the nozzles 39 of the recording unit 24 and the jamming of the paper 12 in the multifunction machine 10.

  Further, the virtual surface 87 including the inclined surface 86 intersects the upper surface 84 (the flat surface 84A in the present embodiment) of the upstream end portion 83 of the downstream support portion 78. For this reason, the sheet 12 guided along the inclined surface 86 abuts on the upper surface 84 and is guided along the upper surface 84. Therefore, the possibility that the paper 12 enters the gap between the downstream rib 75 and the downstream support portion 78 can be reduced.

  Moreover, according to this embodiment, the downstream support part 78 is provided with the recessed part 70, and it can prevent that the clearance gap between the downstream rib 75 and the downstream support part 78 becomes too narrow. As a result, the possibility that the ink ejected from the nozzle 39 and attached to the downstream rib 75 will adhere to the downstream support portion 78 can be reduced.

  Further, according to the present embodiment, the downstream rib 75 has a tapered shape that tapers upward. For this reason, the upper end surface of the downstream rib 75 that is a portion in contact with the paper 12 in the downstream rib 75 becomes small, so that the adhesion of the ink attached to the downstream rib 75 to the paper 12 can be suppressed.

  In addition, according to the present embodiment, the upstream end of the inclined surface 86 in the transport direction 15 is located upstream of the nozzle 39 located on the most downstream side of the transport direction 15 among the plurality of nozzles 39. For this reason, the distance between the platen 42 and the recording unit 24 is increased at the downstream end in the transport direction 15 in the landing area. Thereby, even if the sheet 12 is curved, the sheet 12 can be prevented from floating from the platen 42 at the downstream end portion in the conveyance direction 15 in the landing area.

  Further, according to the present embodiment, since the platen 42 includes the extension rib 74, the ink attached to the downstream rib 75 can be easily fed into the ink absorbing member 82.

  Further, according to the present embodiment, the position range occupied by each downstream rib 75 in the right direction 8 and the left direction 9 is included in the position range occupied by the downstream end portion 81 </ b> A of each contact member 81. Therefore, the corrugated valley portion of the paper 12 provided by the upstream rib 76 and the downstream end 81 </ b> A of the contact member 81 is supported by the downstream rib 75. For this reason, it can suppress that the part of the said trough is located below rather than the downstream rib 75. FIG. As a result, it is possible to prevent ink from adhering to the paper 12.

  Further, according to the present embodiment, since the paper 12 is guided from the inclined surface 86 to the inclined surface 84B via the flat surface 84A, the paper 12 is more than the case where the paper 12 is guided directly from the inclined surface 86 to the inclined surface 84B. 12 can be smoothly guided to the inclined surface 86.

[Modification]
In the above embodiment, the virtual surface 87 intersects the plane 84A upstream of the back side surface 70C of the recess 70 in the transport direction 15, but the virtual surface 87 is closer to the transport direction 15 than the back side surface 70C of the recess 70. It may intersect with the plane 84A downstream. That is, the virtual surface 87 does not have to pass through the recess 70. According to this configuration, the possibility that the paper 12 enters the gap between the downstream rib 75 and the downstream support portion 78 can be made lower than in the above embodiment.

  In the above embodiment, in the right direction 8 and the left direction 9, the position range occupied by the downstream rib 75 is included in the position range occupied by the downstream end 81 </ b> A of the contact member 81. However, in the right direction 8 and the left direction 9, the position range occupied by the downstream rib 75 only needs to overlap at least partly with the position range occupied by the downstream end 81 </ b> A of the contact member 81. For example, the right end of the downstream rib 75 is positioned to the right of the right end of the downstream end 81A of the contact member 81, and the left end of the downstream rib 75 is between the right end and the left end of the downstream end 81A of the contact member 81. May be located.

  Further, in the configuration of the above embodiment and the previous paragraph, the position range occupied by each downstream rib 75 in the right direction 8 and the left direction 9 overlapped with the position range occupied by the downstream end portion 81 </ b> A of each contact member 81. . However, in the right direction 8 and the left direction 9, the position range occupied by a part of the plurality of downstream ribs 75 overlaps with the position range occupied by the downstream end 81 </ b> A of the contact member 81. The position range occupied by the downstream ribs 75 other than the portion may not overlap the position range occupied by the downstream end portion 81 </ b> A of the contact member 81.

  Moreover, in the said embodiment, although the upper surface 84 of the downstream support part 78 was comprised by the plane 84A and the inclined surface 84B, you may be comprised only by the plane 84A or only the inclined surface 84B. When the upper surface 84 is configured only by the inclined surface 84B, the virtual surface 87 intersects the inclined surface 84B.

  Moreover, in the said embodiment, although the downstream rib 75 and the extension rib 74 were the taper shape which tapers toward the protrusion front-end | tip, it does not need to be a taper shape.

10: Multifunction machine (inkjet recording device)
12 ... paper (sheet)
15 ... transport direction 24 ... recording unit 39 ... nozzle 42 ... platen (support member)
60 ... Conveying roller (roller)
75 ... Downstream rib (rib)
78 ... downstream support part 83 ... upstream end part 84B ... inclined surface (second inclined surface)
85: downstream end 86: inclined surface (first inclined surface)
87 ... Virtual plane

Claims (6)

A roller for conveying the sheet in the conveying direction;
A support member that is disposed downstream of the roller in the transport direction and supports the sheet;
A recording unit that is disposed above the support member and that ejects ink droplets from a plurality of nozzles toward the support member;
The support member is
A first rib extending from a landing area where ink droplets ejected by the recording unit land to the downstream in the transport direction from the landing area;
A downstream support portion disposed with a gap from the first rib downstream of the first rib in the transport direction,
The first rib includes a first inclined surface formed at a downstream end in the transport direction and inclined downward toward the transport direction,
The downstream support portion includes a second inclined surface inclined upward in the transport direction, and a concave portion recessed in the transport direction from a position facing the first rib at an upstream end in the transport direction,
The upstream end portion in the transport direction in the downstream support portion is located below the lower end of the first inclined surface,
The virtual recording surface including the first inclined surface is an inkjet recording apparatus that intersects with the sheet support surface of the upstream end portion downstream of the concave portion of the downstream support portion in the transport direction . A roller for conveying the sheet in the conveying direction;
A support member that is disposed downstream of the roller in the transport direction and supports the sheet;
A recording unit that is disposed above the support member and that ejects ink droplets from a plurality of nozzles toward the support member;
The support member is
A first rib extending from a landing area where ink droplets ejected by the recording unit land to the downstream in the transport direction from the landing area;
A downstream support portion disposed with a gap from the first rib downstream of the first rib in the transport direction;
A storage portion that is disposed below a downstream end portion of the first rib in the transport direction, and that stores an ink absorbing member;
A second rib extending downward from the downstream end of the first rib in the transport direction toward the housing portion ,
It said first rib is provided with a first inclined surface which is inclined downwardly toward and above the conveying direction are formed in the downstream end portion,
The downstream support portion includes a second inclined surface inclined upward in the transport direction,
The upstream end portion in the transport direction in the downstream support portion is located below the lower end of the first inclined surface,
An imaginary plane including the first inclined surface is an ink jet recording apparatus that intersects a sheet support surface of the upstream end portion of the downstream support portion. A roller for conveying the sheet in the conveying direction;
A support member that is disposed downstream of the roller in the transport direction and supports the sheet;
A recording unit that is disposed above the support member and that ejects ink droplets from a plurality of nozzles toward the support member;
The support member is
A first rib extending from a landing area where ink droplets ejected by the recording unit land to the downstream in the transport direction from the landing area;
A downstream support portion disposed with a gap from the first rib downstream of the first rib in the transport direction;
It extends from at least the upstream end and the downstream end of the first rib in the transport direction to the upstream of the transport direction from the first rib, and is arranged at an interval in the width direction orthogonal to the transport direction. A plurality of third ribs ,
The inkjet recording apparatus is positioned between the third ribs adjacent in the width direction, upstream of the nozzle in the transport direction, and abuts from above on the sheet supported by the support member. In contact with the third rib, the sheet is provided with a contact portion that gives the sheet a wave shape along the width direction,
The first rib includes a first inclined surface formed at a downstream end in the transport direction and inclined downward toward the transport direction,
The downstream support portion includes a second inclined surface inclined upward in the transport direction,
The upstream end portion in the transport direction in the downstream support portion is located below the lower end of the first inclined surface,
The virtual plane including the first inclined surface intersects the sheet support surface of the upstream end portion of the downstream support portion ,
The third rib is arranged at a position different from the first rib in the width direction,
An inkjet recording apparatus in which at least a part of a position range occupied by at least one of the first ribs and the contact portion overlaps in the width direction . A roller for conveying the sheet in the conveying direction;
A support member that is disposed downstream of the roller in the transport direction and supports the sheet;
A recording unit that is disposed above the support member and that ejects ink droplets from a plurality of nozzles toward the support member;
The support member is
A first rib extending from a landing area where ink droplets ejected by the recording unit land to the downstream in the transport direction from the landing area;
A downstream support portion disposed with a gap from the first rib downstream of the first rib in the transport direction,
The first rib includes a first inclined surface formed at a downstream end in the transport direction and inclined downward toward the transport direction,
The downstream support portion includes a second inclined surface inclined upward in the transport direction,
The upstream end portion in the transport direction in the downstream support portion is located below the lower end of the first inclined surface,
The virtual plane including the first inclined surface intersects the sheet support surface of the upstream end portion of the downstream support portion ,
The sheet support surface includes a plane extending along the transport direction at the upstream end,
The second inclined surface is provided downstream in the transport direction from the plane,
An ink jet recording apparatus in which the virtual plane intersects the plane . The ink jet recording apparatus according to claim 1 , wherein the first rib has a tapered shape that tapers upward. Said the conveying direction of the upstream end of the first inclined surface, according to any of claims 1-5 positioned upstream of the conveying direction than the nozzle located most downstream of the transport direction among the plurality of nozzles Inkjet recording apparatus.

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