JP6477018B2 - 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 a nozzle.

  2. Description of the Related Art Conventionally, an ink jet recording apparatus that records an image on a sheet by discharging ink droplets from nozzles is known. In an ink jet recording apparatus, when ink droplets are ejected onto a sheet such as paper by a recording unit, the sheet into which ink has permeated is deformed so as to warp. Due to the deformation of the sheet, there is a problem that the sheet comes into contact with the recording head or the leading edge of the sheet is not guided to the nip position of the roller pair. In order to solve this problem, it has been devised that the sheet conveyed on the platen is waved in a width direction orthogonal to the conveying direction (Patent Document 1).

  Also, in a sheet conveying device that gives a wave shape to a sheet, it is arranged at a position where a small size sheet passes from the viewpoint that it is not preferable to give a large wave shape to a small size and high rigidity sheet such as a postcard. It has been devised to make the height of the seat guides made lower than the height of the sheet guides arranged at other positions (Patent Document 2).

JP 2000-71532 A JP 2005-41669 A

  There are various types of sheets as image recording media in an inkjet recording apparatus, and only small-sized sheets are not necessarily high in rigidity. Therefore, regardless of the size of the sheet, it is desirable to provide a mechanism that imparts a relatively large wave shape to a sheet having low rigidity, and imparts a relatively small wave shape to a sheet having high rigidity. For example, there is a mechanism capable of imparting a corrugated shape corresponding to the rigidity of the sheet by configuring one of the concavo-convex structure that imparts a corrugated shape, that is, a concave structure or a convex structure to be relatively movable corresponding to the rigidity of the sheet. realizable. However, if one of the concavo-convex structures is configured to be movable, the positioning accuracy of the movable concave structure or convex structure affects the accuracy of the amplitude of the waveform. That is, if the positioning accuracy of the movable concave structure or convex structure is poor, the wave shape becomes unstable.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide an ink jet recording apparatus in which the waveform shape is variable according to the rigidity of the sheet and the waveform can be stably applied. It is to provide.

  (1) An ink jet recording apparatus according to the present invention has a nozzle surface provided with nozzles, and records ink by ejecting ink droplets from the nozzles in order to record an image on a sheet transported in a transport direction in a transport path. And a plurality of discharge rollers disposed downstream of the recording unit in the transport direction, parallel to the nozzle surface and separated from each other in a width direction intersecting the transport direction, and a plurality of the discharges A discharge roller shaft that supports and rotates integrally with the roller; a first spur that is disposed to face each of the plurality of discharge rollers; and that is disposed to face the recording unit in the conveyance path. It is movable to a position and a second position farther from the virtual plane including the nozzle surface than the first position, and a support member that supports the sheet is provided on the support member and is adjacent in the width direction. In the state where the support member is located at the first position, the protruding end that protrudes into the conveyance path is located between the discharge roller and the imaginary plane from the nip position where the discharge roller and the spur pinch the sheet. A first abutting member close to the abutting member, and a supporting portion that abuts on the discharge roller shaft when the supporting member is in the first position, and the supporting member is disposed on the first supporting member. A first urging member that urges toward the position.

  When the support member moves from the first position to the second position against the biasing force of the first biasing member, the relative positional relationship between the nip position and the protruding end of the first contact member varies. Thereby, the wave shape according to the rigidity of a sheet | seat can be provided. On the other hand, since the support member is positioned at the first position with reference to the discharge roller shaft, the nip position at the first position and the protruding end of the first contact member are accurately positioned.

  (2) Preferably, the ink jet recording apparatus further includes a plurality of second spurs arranged downstream of the discharge roller in the transport direction and at the same position as the plurality of the discharge rollers in the width direction. The projecting ends of the plurality of second spurs that project into the conveyance path are farther from the virtual plane than the projecting ends of the first contact member, and the discharge roller and the first spur sandwich the sheet. The shortest distance from the nip position closer to or closer to the virtual plane is the same. In this case, the corrugated trough of the sheet is maintained by the second spur even downstream of the discharge roller in the conveying direction.

  (3) Preferably, the ink jet recording apparatus is disposed upstream of the nozzle in the transport direction and extends toward the support member, and is disposed at the same position as the first spur in the width direction. The second abutting member is disposed between the abutting portions of the second abutting members adjacent to each other in the width direction, and a projecting end projecting into the transport path is formed on the second abutting member. A third abutting member that is closer to the virtual plane than a protruding end that protrudes into the conveyance path. As a result, the second contact member and the third contact member impart a wave shape to the sheet upstream in the transport direction from the nozzle of the recording unit.

  (4) Preferably, the contact portion is provided at a downstream end of the support member in the transport direction. As a result, the downstream end of the support member in the transport direction is positioned as a contact portion with reference to the discharge roller shaft, so that the contact portion is accurately positioned.

  (5) Preferably, the ink jet recording apparatus is disposed upstream of the recording unit in the transport direction, and supports a pair of transport rollers that transport the sheet in the transport direction and one roller of the pair of transport rollers. And a second urging member that urges the support member to abut against the roller holder. As a result, the upstream end of the support member in the conveying direction is accurately positioned with reference to the roller holder.

  (6) Preferably, the ink jet recording apparatus further includes a first support frame that supports the recording unit, and a second support frame that supports the discharge roller shaft, and the second contact member. Is supported by the first support frame, and the first support frame is supported by the second support frame. Thereby, the nozzle surface of the recording unit, the discharge roller shaft, and the second contact member are accurately positioned.

  (7) Preferably, the contact portion of the second contact member and the nip position are the same position in the width direction, and the shortest distance from the virtual plane is substantially the same. As a result, the distance between the corrugated sheet and the nozzle surface is stabilized upstream and downstream in the conveying direction from the nozzles of the recording unit. Note that “substantially the same” means that not only the two shortest distances are exactly the same, but also includes a state in which the two shortest distances are within a predetermined range where the effects of the present invention can be achieved.

  (8) Preferably, the said 1st contact member and the said 3rd contact member are rib shape extended continuously along the said conveyance direction. Thereby, a 1st contact member and a 3rd contact member are easily realizable.

  (9) Preferably, in a state where the support member is in the second position, a protruding end from which the first contact member protrudes into the transport path is farther from the imaginary plane than the nip position, or with the imaginary plane. The shortest distance is substantially the same. Thereby, it is possible to hardly give a wave shape to a highly rigid sheet.

  (10) Preferably, the recording unit is mounted on the carriage supported by the first support frame and movable in a width direction crossing the transport direction and parallel to the nozzle surface, And a recording head having the nozzle.

  According to the present invention, in the ink jet recording apparatus, the size of the wave shape is variable according to the rigidity of the sheet, and the wave shape can be stably applied.

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 schematic diagram illustrating a configuration of the multifunction machine 10. FIG. 3 is a plan view of the first guide rail 36 and the platen 35. FIG. 4 is a perspective view from the downstream of the sheet conveying direction 6 in FIG. FIG. 5 is a perspective view from the upstream of the sheet conveying direction 6 of FIG. 6A is a cross-sectional view taken along line AA in FIG. 3, and FIG. 6B is an explanatory view showing a state in which the platen 35 has moved downward in the cross section in FIG. 6A. 7A is a cross-sectional view taken along line BB in FIG. 3, and FIG. 7B is an explanatory view showing a state in which the platen 35 has moved downward in the cross-sectional view in FIG. 7A. 8A and 8B are cross-sectional views for explaining the operation of the upstream wave shape imparting mechanism 61, respectively. FIG. 9 is a schematic diagram for explaining the operation of the upstream wave shape imparting mechanism 61 when the postcard 90 is conveyed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. 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. In the following description, an up-down direction 7, a front-rear direction 8, and a left-right direction 9 (hereinafter referred to as “width direction 9”) are defined with reference to the state of FIG. .

[Overall configuration of MFP 10]
A multifunction device 10 (an example of an “inkjet recording apparatus”) illustrated in FIG. 1 has various functions such as a printer function, a facsimile function, and a copy function. The multifunction machine 10 includes an apparatus main body 11 configured in a generally thin rectangular parallelepiped shape, and a feeding tray 13 that is detachable from a lower portion of the apparatus main body 11. As shown in FIG. 1, the feeding tray 13 is attached to the apparatus main body 11, and is pulled out forward with respect to the apparatus main body 11, so that the feeding tray 13 is not attached to the apparatus main body 11.

  As shown in FIG. 2, a recording unit 31 that records an image on a recording medium is provided in the upper part of the apparatus main body 11. The feeding tray 13 attached to the apparatus main body 11 is positioned below the recording unit 31 and can accommodate a plurality of sheets as recording media stacked in a vertical direction. In the present embodiment, a recording sheet 14, which is A4 size plain paper, is accommodated in the feeding tray 13 with the longitudinal direction along the front-rear direction 8 as a sheet. The size of the recording paper 14 accommodated in the feeding tray 13 is merely an example, and other sizes and sheets other than plain paper may be used.

  Inside the apparatus main body 11, the uppermost sheet of recording paper 14 accommodated in the feeding tray 13 is conveyed backward, and is conveyed backward from the feeding tray 13. And a feeding guide member 15 for guiding the recording sheet 14 to the upper side. The feeding guide member 15 is disposed at a position close to the back surface in the apparatus main body 11.

  The feeding unit 16 includes a feeding roller 16A along the width direction 9 and a support arm 16B that supports the feeding roller 16A so as to be movable in the vertical direction 7. The support arm 16B is rotatably supported by a support shaft 16D along the width direction 9, and the feed roller 16A is rotatably supported by the distal end portion of the support arm 16B. When the support arm 16B rotates in the vertical direction 7 about the support shaft 16D, the feed roller 16A is separated from the position where it abuts on the uppermost recording paper 14 in the feeding tray 13 and the recording paper 14 upward. Move to the position you have. The feed roller 16A is rotated by the power of a motor (not shown) being transmitted through a power transmission mechanism 16C.

  When the feeding roller 16 </ b> A is rotated in contact with the uppermost recording paper 14 accommodated in the feeding tray 13, the recording paper 14 is fed backward. The recording sheet 14 fed from the feeding tray 13 is conveyed to the lower end portion of the feeding guide member 15.

  The feeding guide member 15 is provided with a feeding path 15C through which the recording paper 14 passes. The feeding path 15 </ b> C has an arc shape protruding toward the back surface of the apparatus main body 11, and the recording paper 14 guided by the feeding guide member 15 faces forward from the upper end portion of the feeding guide member 15. Are transported.

  The recording paper 14 in the feeding tray 13 is conveyed in a state (central reference) in which the central portion in the width direction 9 is along the central portion in the width direction 9 of the feeding path 15C. Further, the multifunction machine 10 can feed not only the A4 size recording paper 14 but also a smaller size recording paper, for example, a postcard (stiffer than plain paper) in the feeding path 15C with a central reference. It has become. The postcard is merely an example of a small-sized sheet, and may be an L-sized sheet or the like.

  A transport roller pair 21 that transports the recording paper 14 that has passed through the upper end of the feeding guide member 15 to the lower side of the recording unit 31 is provided at a front position close to the upper end of the feeding guide member 15. The recording paper 14 is supported below the recording unit 31 in front of the conveyance roller pair 21, that is, in the conveyance direction of the recording paper 14 by the conveyance roller pair 21 (hereinafter referred to as sheet conveyance direction 6 (see FIG. 2)). A platen 35 (an example of a “support member”) is provided. An upstream wave shape imparting mechanism 61 for imparting a wave shape along the width direction 9 to the recording paper 14 and a downstream wave upstream and downstream in the sheet conveyance direction 6 with respect to the recording head 33 provided below the recording unit 31. A shape imparting mechanism 41 is provided.

  The conveyance roller pair 21 includes a single conveyance roller 22 that contacts the upper surface (first surface) of the recording paper 14 that has passed through the feeding guide member 15 and a plurality of pinches that contact the lower surface (second surface) of the recording paper 14. And a roller 26. The recording sheet 14 that has passed through the feeding guide member 15 is nipped (niped) by the conveying roller 22 and the pinch roller 26 that have been rotated, and is conveyed to a conveying path 29 formed between the platen 35 and the recording unit 31. Be transported. The conveyance path 29 reaches the paper discharge tray 17 via the downstream wave shape imparting mechanism 41.

  The recording unit 31 provided above the platen 35 includes a first guide frame 36 (an example of a “first support frame”) and a second guide frame 36 arranged along the width direction 9 orthogonal to the sheet conveyance direction 6. It is supported by a guide frame 37. The first guide frame 36 and the second guide frame 37 are supported in parallel with each other with a certain predetermined interval in the sheet conveyance direction 6.

  The recording unit 31 includes a carriage 32 slidably provided between the first guide frame 36 and the second guide frame 37, and a recording head 33 is provided below the carriage 32.

  The recording head 33 includes a plurality of nozzles 34 that eject ink downward. Each nozzle 34 is supplied with ink from an ink cartridge (not shown). The plurality of nozzles 34 are arranged in a row along the sheet conveying direction 6 and open to a nozzle surface 34 </ b> A that is the lower surface of the recording head 33. The nozzle surface 34 </ b> A is a plane along the sheet conveyance direction 6 and the width direction 9. In the present embodiment, the nozzle surface 34A is in a horizontal state.

  A platen 35 provided below the recording unit 31 supports the recording sheet 14 conveyed by the conveying roller pair 21. When the recording paper 14 conveyed by the conveying roller pair 21 reaches a predetermined position on the platen 35, the conveyance of the recording paper 14 is stopped.

  In the recording unit 31, when the recording paper 14 is stopped on the platen 35, ink is selectively selected from the nozzles 34 of the recording head 33 while the carriage 32 is slid in the width direction 9 orthogonal to the sheet conveyance direction 6. A discharging recording process is executed. Thereafter, the recording paper 14 on the platen 35 is conveyed by a predetermined distance by the conveying roller pair 21 and the above recording process is repeatedly executed, whereby an image is recorded on the entire recording paper 14. .

  A downstream wave shape imparting mechanism 41 provided in the sheet conveyance direction 6 with respect to the recording head 33 conveys the recording paper 14 supported on the platen 35 in the sheet conveyance direction 6 and also onto the recording paper 14 on the platen 35. A wave shape along the width direction 9 is given.

  The downstream wave shape imparting mechanism 41 includes a plurality of discharge rollers 42 </ b> A that contact the lower surface (second surface) of the recording paper 14 on which an image is recorded by the recording unit 31, and a plurality of rollers that contact the upper surface (first surface) from above. It has a first spur 43A and a plurality of second spurs 44A. The plurality of discharge rollers 42A are disposed to be separated from each other in the width direction 9, and the plurality of first spurs 43A are respectively disposed above the discharge rollers 42A. Each of the first spurs 43 </ b> A is supported by a spur support member 46. A single discharge roller shaft 42B is inserted through each axial center of the discharge roller 42A.

  The recording paper 14 is nipped by the discharge roller 42 </ b> A and the first spur 43 </ b> A, thereby being waved along the width direction 9 and conveyed downstream in the sheet conveying direction 6. The plurality of second spurs 44A abut on the upper surface of the recording paper 14 conveyed by the discharge roller 42A and the first spur 43A. Thereafter, the recording paper 14 is discharged onto the paper discharge tray 17.

[Conveying roller pair]
As shown in FIG. 4, the conveyance rollers 22 of the conveyance roller pair 21 are respectively supported by subframes 39 (an example of “second support frame”) that support both ends of the first guide frame 36 in the width direction 9. ing. Although not shown in FIGS. 3 and 4, both ends of the second guide frame 37 in the width direction 9 are also supported by the subframes 39. The rotation of a motor (not shown) is transmitted to the transport roller 22 and is rotated in the direction indicated by the arrow D1 in FIG.

  As shown in FIG. 7A, the plurality of pinch rollers 26 are provided below the conveying roller 22, and are supported by the roller holder 28 in a state of being spaced apart in the width direction 9. . The roller holder 28 is movable so that each pinch roller 26 is separated from the state in contact with the conveying roller 22. Each pinch roller 26 in contact with the conveyance roller 22 rotates following the rotation of the conveyance roller 22.

  The position where the conveyance roller 22 and each pinch roller 26 are in contact is a nip position NP1 that sandwiches the recording sheet 14 to be conveyed. The recording sheet 14 that is sandwiched at the nip position NP1 rotates the conveyance roller 22 and the pinch roller 26. Thus, the sheet is conveyed downstream in the sheet conveying direction 6.

[Upstream wave shaping mechanism]
As shown in FIGS. 3 and 4, the upstream wave shape imparting mechanism 61 includes seven upstream contact members 62 (an example of “second contact member”) attached to the lower surface of the first guide frame 36. The upstream wave shape imparting mechanism 61 has end contact members 63 provided at both ends in the width direction 9.

  As shown in FIG. 4, of the seven upstream abutment members 62, three located in the center portion in the width direction 9 constitute the central wave shape imparting portion 61A, and the central wave shape imparting portion 61A Two pieces respectively provided on both outsides in the width direction 9 constitute a set of side wave shape imparting portions 61B. The central upstream contact member 62 in the central wave shape imparting portion 61 </ b> A is disposed at a position corresponding to the center of the platen 35 in the width direction 9.

  The three upstream abutment members 62 constituting the central wave shape imparting portion 61A are arranged at a constant interval G1. As will be described later, these three upstream abutting members 62 are small-sized recording sheets (for example, lengths) along the width direction 9 such that only the three upstream abutting members 62 abut on each other. It is provided to give a wave shape to the A4 size recording paper 14 without giving a wave shape to the postcard.

  As shown in FIG. 3, the two upstream contact members 62 constituting the side corrugation imparting portion 61B are arranged with a gap G2 shorter than the gap G1. The upstream contact members 62 at both ends in the width direction 9 of the central wave shape imparting portion 61A and the upstream contact members 62 adjacent to the central waveform shape imparting portion 61A in the side waveform shape imparting portion 61B are equal to the gap G1. An interval (= G1) is provided. The end contact member 63 and the upstream contact member 62 adjacent to the end contact member 63 in the side corrugation imparting portion 61B are spaced apart from the distance G1 (= G1).

  The seven upstream abutment members 62 have the same shape, and as shown in FIG. 6, the base portion 62A attached to the lower surface of the first guide frame 36 and the base portion 62A suspended from the base portion 62A. It has the connection part 62B and the contact part 62C provided in the lower end part of the connection part 62B. The upstream contact member 62 is integrally formed of a synthetic resin (for example, polyacetal (POM)).

  The base portion 62A is positioned below the first guide frame 36 and has a plurality of locking portions 62D that are locked to the first guide frame 36. Each locking portion 62D protrudes upward from the base portion 62A. The first guide frame 36 is provided with openings 36A (see FIGS. 3 and 4) into which the respective locking portions 62D are inserted.

  The connecting portion 62B is in the form of a strip having a substantially constant length along the width direction 9, and as shown in FIG. 6, the outer periphery of the conveying roller 22 from the downstream end in the sheet conveying direction 6 in the base portion 62A. It is the curved state which protruded ahead so that a part may be met. The downstream end of the connection portion 62B in the sheet conveyance direction 6 is located downstream and below the sheet conveyance direction 6 with respect to the base portion 62A. The connecting portion 62B has flexibility that can move in the vertical direction 7.

  The contact portion 62C provided at the lower end portion of the connection portion 62B has a flat plate shape, and is formed in a triangular shape in which the length along the width direction 9 is sequentially shortened toward the front side in plan view. . The contact portion 62 </ b> C is located upstream of the position of the nozzle 34 in the recording unit 31 in the sheet conveying direction 6 and extends toward the platen 35. The abutting portion 62C is inclined so that the tip portion located downstream in the sheet conveying direction 6 is located at the lowest position. The tip of the contact portion 62C is a contact portion that contacts the upper surface of the recording paper 14 from above.

  As shown in FIG. 6, the contact portion of the contact portion 62C of the upstream contact member 62 with the upper surface of the recording paper 14 is downstream from the nip position NP1 of the recording paper 14 by the transport roller pair 21 in the sheet transport direction 6. Is separated by a distance L1. The contact portion 62 </ b> C is movable in the vertical direction 7 orthogonal to the sheet conveying direction 6.

  As shown in FIG. 4, end contact members 63 provided on both outer sides in the width direction 9 of all upstream contact members 62 are connected to the base portion 63 </ b> A in the same manner as the upstream contact members 62. It has a portion 63B and a contact portion 63C. The contact portion 63C has a quadrangular shape in plan view. Other configurations of the end contact member 63 are substantially the same as those of the upstream contact member 62. The contact portion 63 </ b> C of the end contact member 63 presses both ends in the width direction 9 of the recording paper 14 conveyed by the conveyance roller pair 21 downward.

[Platen]
As shown in FIG. 5, the platen 35 includes a platen main body portion 35A located below the recording unit 31 and a downstream support portion 35B provided continuously downstream of the platen main body portion 35A in the sheet conveying direction 6. Have. The platen main body portion 35A is configured in a flat plate shape having a constant length along the width direction 9. Both ends of the platen main body portion 35 </ b> A in the width direction 9 are close to the sub-frames 39.

  The downstream support portion 35B is configured in a band plate shape along the width direction 9, and both ends of the width direction 9 are located in the center of the width direction 9 rather than both ends of the width direction 9 in the platen main body portion 35A. . The downstream support portion 35B is provided continuously downstream of the platen main body portion 35A in the sheet conveyance direction 6 and continuously downstream of the first guide portion 35C and in the first guide portion 35C of the sheet conveyance direction 6 downstream. And a discharge main body 35D.

  As shown in FIG. 7A, the first guide portion 35C is provided with a first guide surface 35R that is continuous downstream from the upper surface of the platen main body portion 35A in the sheet conveying direction 6. The first guide surface 35R is inclined so that the distance from the virtual plane VS1 including the nozzle surface 34A becomes shorter as it goes downstream in the sheet conveyance direction 6. Accordingly, the distance between the discharge main body 35D and the virtual plane VS1 including the nozzle surface 34A is shorter than the distance between the platen main body 35A and the virtual plane VS1.

  As shown in FIG. 5, the downstream support portion 35B is provided with a central opening 35E provided at the central portion in the width direction 9 and at a distance from both sides in the width direction 9 with respect to the central opening 35E. Side opening 35F. The central opening 35 </ b> E is provided at a position corresponding to the downstream of the sheet conveyance direction 6 with respect to the central wave shape imparting part 61 </ b> A in the upstream wave shape imparting mechanism 61. Each of the side opening portions 35F is provided at a position corresponding to the downstream side of the sheet conveying direction 6 with respect to each side wave shape imparting portion 61B. The central opening 35E and the side openings 35F are located between the discharge main body 35D and the platen main body 35A, and the discharge roller shaft 42B is inserted below the central opening 35E and the side opening 35F. doing.

  As shown in FIGS. 4 and 5, the upper portions of the five discharge rollers 42 </ b> A provided in the central portion of the discharge roller shaft 42 </ b> B in the width direction 9 are positioned in the central opening 35 </ b> E. The five discharge rollers 42 </ b> A are arranged at a constant interval in the width direction 9. Out of the five discharge rollers 42A, the discharge roller 42A located at the center in the width direction 9 corresponds to the downstream side of the sheet conveyance direction 6 of the upstream contact member 62 located at the center in the width direction 9 in the central wave shape imparting portion 61A. It is provided in the position to do. Further, among the five discharge rollers 42A, the discharge rollers 42A positioned at both ends in the width direction 9 are in the sheet conveyance direction 6 of the upstream contact members 62 positioned at both ends in the width direction 9 in the central wave shape imparting portion 61A. It is provided in the position corresponding to the downstream of this.

  As shown in FIGS. 4 and 5, the upper portions of the two discharge rollers 42 </ b> A provided at both ends of the discharge roller shaft 42 </ b> B in the width direction 9 are positioned in the side opening 35 </ b> F. The two discharge rollers 42A are provided at positions corresponding to the downstream side of the sheet conveying direction 6 of the two upstream contact members 62 constituting each side wave shape imparting portion 61B.

  As shown in FIG. 5, the platen main body portion 35 </ b> A is provided with second guide portions 35 </ b> S at positions upstream of the nine discharge rollers 42 </ b> A in the sheet conveying direction 6. As shown in FIG. 6B, each of the second guide portions 35S has a second guide surface 35T extending continuously from the upper surface of the platen main body portion 35A and downstream in the sheet conveying direction 6. . Similarly to the first guide surface 35R (see FIGS. 7A and 7B) of the first guide portion 35C, the second guide surface 35T has a distance from the virtual plane VS1 as it becomes downstream in the sheet conveyance direction 6. Inclined to be shorter.

  As shown in FIG. 7A, the first guide portion 35C of the downstream support portion 35B provided at the downstream end of the platen 35 in the sheet conveying direction 6 is engaged with the discharge roller shaft 42B. 35U is provided. Each of the engaging members 35U extends from the upstream end of the first guide portion 35C in the sheet conveying direction 6 to the lower side and the lower end portion of the extending portion 35V toward the downstream side of the sheet conveying direction 6. And an extended contact portion 35W. The contact portion 35W is located below the discharge roller shaft 42B.

  On the lower surface of the discharge main body portion 35D facing the discharge roller shaft 42B, a restricting portion 35X that contacts the discharge roller shaft 42B and restricts the movement of the platen 35 is provided. The interval between the restricting portion 35X and the abutting portion 35W of the engaging member 35U is larger than the diameter of the discharge roller shaft 42B.

  As shown in FIG. 6A, a plurality of first coil springs 51 arranged at intervals in the width direction 9 are provided at the downstream end of the platen main body 35A. The first coil springs 51 are respectively provided at positions corresponding to the upstream of the sheet conveyance direction 6 with respect to the central opening 35E and the side opening 35F in the discharge main body 35D, and the downstream end of the platen main body 35A is provided. It is biased toward the virtual plane VS1 (upward). In the state where the recording paper 14 is not conveyed, the platen 35 is in contact with the discharge roller shaft 42B at the contact portion 35W of the engagement member 35U as shown in FIG. 7A. Thereby, the downstream end of the platen 35 in the sheet conveyance direction 6 is positioned by restricting the upward movement.

  As shown in FIG. 7A, a plurality of spring receiving portions 35Y are provided at intervals in the width direction 9 at the upstream end portion of the platen main body portion 35A in the sheet conveyance direction 6. Each spring receiving portion 35 </ b> Y is disposed at a position corresponding to the upstream of the sheet conveying direction 6 with respect to the first coil spring 51. The spring receiving portion 35Y protrudes upstream in the sheet conveying direction 6 at a position farther from the virtual plane VS1 than the platen main body portion 35A. A second coil spring 52 that urges the downstream end portion of the platen main body portion 35A in the conveying direction 6 upward (virtual plane VS1) is engaged with the lower portion of each spring receiving portion 35Y.

  In a state where the spring receiving portion 35Y is urged by the second coil spring 52, the spring receiving portion 35Y comes into contact with an engaging portion 28A (see FIG. 6) provided on the roller holder 28 of the pinch roller 26 constituting the conveying roller pair 21. As a result, the upstream end of the platen 35 in the sheet conveying direction 6 is positioned with its upward movement restricted.

  As shown in FIGS. 4 and 5, the flat platen main body 35 </ b> A has a sheet conveyance direction between the central wave shape imparting portion 61 </ b> A and each of the side wave shape imparting portions 61 </ b> B in the width direction 9. 6, one first main rib 35 </ b> G (an example of “first contact member”) is provided. The first main rib 35G protrudes from the upper surface of the platen main body portion 35A to the upper conveyance path 29. Similarly, one first main rib 35 </ b> G protruding to the upper conveyance path 29 is also provided between each of the side waveform imparting portions 61 </ b> B and the end contact member 63. Each of the first main ribs 35G has the same configuration, and is provided from the upstream end portion of the platen main body portion 35A in the sheet conveyance direction 6 to the entire area of the platen main body portion 35A in the sheet conveyance direction 6.

  In the downstream support portion 35B of the platen 35, second main ribs 35K (an example of “third contact member”) arranged along the sheet conveying direction 6 continuously to the first main ribs 35G of the platen main body portion 35A. Each is provided. The second main rib 35K is configured integrally with the continuous first main rib 35G, and projects from the upper surface of the discharge main body 35D in the downstream support portion 35B to the upper conveyance path 29. The protruding ends of the first main rib 35G and the second main rib 35K are located in the same plane. Each of the second main ribs 35K extends further downstream from the downstream end in the sheet conveying direction 6 in the downstream support portion 35B.

  In a state where the recording paper 14 is not conveyed, the platen 35 is urged by the first coil spring 51 and the second coil spring 52 as shown in FIG. 7A, and the contact portion 35W of the engagement member 35U is discharged. The roller bearing 42 </ b> Y contacts the roller shaft 42 </ b> B, and the spring receiving portion 35 </ b> Y contacts the engaging portion 28 </ b> A of the roller holder 28. Thereby, the whole platen 35 including the downstream support portion 35B is positioned at a position (first position) closest to the virtual plane VS1. In this case, the distance between the first main rib 35G of the platen main body portion 35A and the second main rib 35K of the downstream support portion 35B is the shortest with the virtual plane VS1 including the nozzle surface 34A. Further, the shortest distance between each of the first main rib 35G and the second main rib 35K and the virtual plane VS1 is substantially the same.

  The platen main body portion 35A is provided with one sub-rib 35H at a position corresponding to the lower side of the central upstream contact member 62 in the central wave shape imparting portion 61A. The sub ribs 35H extend along the sheet conveying direction 6 and protrude upward from the upper surface of the platen main body 35A. The protruding end of the sub rib 35H is located farther from the virtual plane VS1 than the protruding end of the first main rib 35G. The downstream end of the sub-rib 35H in the sheet conveyance direction 6 is disposed at a position closer to the downstream support portion 35B than the center in the front-rear direction 8 of the platen main body portion 35A.

  When the platen 35 is in the first position, as shown in FIG. 6A, the protruding end of the first main rib 35G is in contact with the upstream contact member 62 when the recording paper 14 is not conveyed. It is located closer to the virtual plane VS1 than the contact portion with the recording paper 14 at 62C. In this case, the contact portion 62C of the upstream contact member 62 located at the center in the width direction 9 in the upstream wave shape imparting mechanism 61 has a contact portion with the recording paper 14 positioned below the contact portion 62C. It contacts the protruding end of the sub-rib 35H.

  When a force is applied in a direction away from the virtual plane VS1, the platen 35 is moved to a second position far from the virtual plane VS1 against the urging force of the first coil spring 51 and the second coil spring 52. At this time, the projecting ends from which the first main ribs 35G and the second main ribs 35K project to the transport path 29 are far from the virtual plane VF1 than the nip position NP1 by the transport roller pair 21 or the shortest distance from the virtual plane VF1 is substantially the same. .

[Downstream wave shaping mechanism]
As shown in FIG. 6, the downstream wave shape imparting mechanism 41 including a plurality of discharge rollers 42A includes a spur support member 46 that supports the first spur 43A and the second spur 44A above the discharge rollers 42A.

  Each discharge roller 42A is formed in a cylindrical shape by an elastic member such as rubber, and is fitted coaxially to the discharge roller shaft 42B. The discharge roller shaft 42B is rotated in the direction indicated by the arrow D2 in FIG. 2 when the rotational force of the motor is transmitted through a transmission mechanism (not shown). Thereby, all the discharge rollers 42 </ b> A rotate integrally.

  As shown in FIG. 6A, the upstream end of the spur support member 46 in the sheet conveyance direction 6 is located above the discharge roller 42A. As shown in FIGS. A first spur 43A is supported above the discharge roller 42A. The first spur 43A is provided with two disc-shaped spur portions 43C with an interval in the width direction 9. On each outer peripheral surface of the spur portion 43C, an uneven portion is provided along the circumferential direction. A shaft body 43B along the width direction 9 is inserted through the axial center portion of the first spur 43A. The shaft body 43B is rotatably supported by a spur support portion 46C (see FIG. 6A) provided along the sheet conveying direction 6 on both sides in the width direction 9 with respect to the spur portion 43C.

  As shown in FIG. 6A, each spur portion 43C in the first spur 43A is in contact with each discharge roller 42A located below the recording paper 14, and each discharge roller 42A. Rotate following the rotation. A position where each spur portion 43C of the first spur 43A and the discharge roller 42A are in contact is a nip position NP2 for sandwiching the recording paper 14 to be conveyed, and the recording paper 14 sandwiched at the nip position NP2 is The sheet is conveyed downstream in the sheet conveying direction 6 by the rotation of the discharge roller 42A and the spur unit 43C.

  The nip position NP2 by the first spur 43A and the discharge roller 42A is the same position in the width direction 9 as the position where the contact portion 62C of each upstream contact member 62 of the upstream wave shape imparting mechanism 61 contacts the recording paper 14. . Further, the nip position NP2 is separated from the virtual plane VS1 by a predetermined distance, and the shortest distance from the virtual plane VS1 is the leading end portion (the contact with the recording paper 14) of the contact portion 62C of the upstream contact member 62. This is substantially the same as the shortest distance between the contact portion) and the virtual plane VS1.

  When the platen 35 is in the first position, the protruding end of the second main rib 35K provided in the downstream support portion 35B is closer to the virtual plane VS1 than the nip position NP2 by the first spur 43A and the discharge roller 42A. Accordingly, the first spur 43A contacts the upper surface of the recording paper 14 from above, similarly to the contact portion 62C of the upstream contact member 62, between the adjacent second main ribs 35K.

  As shown in FIGS. 4 and 5, one end spur 45 </ b> A is provided at each outer position in the width direction 9 with respect to all the first spurs 43 </ b> A. The end spur 45A has the same configuration as the first spur 43A, and has two spurs 45C. A shaft body 45B along the width direction 9 is inserted through each axial center portion of the end spur 45A. The shaft body 45B is also rotatably supported by spur support portions (not shown) provided on both outer sides in the width direction 9 of the two spur portions 45C.

  The second spur 44A is supported at a position corresponding to the downstream of the sheet conveying direction 6 with respect to each of the first spurs 43A. Each of the second spurs 44A has the same configuration as that of the first spur 43A, and has two spur parts 44C. A shaft body 44B is inserted along the width direction 9 in each axial center portion of the second spur 44A. The shaft body 44B is rotatably supported by a spur support portion 46C (see FIG. 6A) provided on both outer sides in the width direction 9 of the two spur portions 44C.

  The lowermost part of each spur portion 44C of the second spur 44A is a projecting end that projects to the conveyance path 29, and the projecting end is from the virtual plane VS1 from the nip position NP2 by the first spur 43A and the discharge roller 42A. It ’s close.

[Upstream wave shaping mechanism, platen, downstream wave shaping mechanism]
In the MFP 10 having such a configuration, the A4 size recording paper 14 in the feeding tray 13 is centered on the feeding path 15C in the feeding guide member 15 with the longitudinal direction being along the sheet conveying direction 6. Conveyed by reference. Thereafter, the recording paper 14 is nipped by the conveyance roller 22 and the pinch roller 26 in the conveyance roller pair 21 and conveyed onto the platen 35. The platen 35 is at the first position closest to the virtual plane VS1 when the recording paper 14 is not conveyed.

  In this state, when the recording paper 14 is transported to the upstream wave shape imparting mechanism 61, the tip portions of the contact portions 62C and 63C of the seven upstream contact members 62 and the end contact member 63 are The first conveying roller pair 21 contacts the upper surface of the recording paper 14 at a position separated from the nip position NP1 of the recording paper 14 by a distance L1. As a result, the recording paper 14 is pushed down in the direction away from the virtual plane VS1 by the respective contact portions 62C and 63C. Further, both end portions of the recording paper 14 in the width direction 9 are respectively pushed down by the end contact members 63.

  In this case, since the first main rib 35G is provided in the platen main body portion 35A, as shown in FIG. 8A, the portions of the recording paper 14 that are in contact with the first main ribs 35G are not pushed down. A recess is formed in the portion where the contact portion 62C contacts between the first main ribs 35G. As a result, the recording paper 14 is given a wave shape along the width direction 9.

  The recording paper 14 is not swollen because an ink is not infiltrated before an image is recorded in the recording unit 31. From this, the recording paper 14 is pushed down at a portion where the contact portion 62 </ b> C comes into contact with a relatively small pressing amount corresponding to the rigidity of the recording paper 14. That is, the central portion of the recording paper 14 in the width direction 9 has higher rigidity than that of both ends in the width direction 9, and therefore, the three upstream abutments constituting the central wave shape imparting portion 61 </ b> A. The amount of pressing of the member 62 by the abutting portion 62C is smaller than the amount of pressing by the abutting portions 62C of the two upstream abutting members 62 that constitute each side waveform imparting portion 61B.

  Further, in the central portion of the recording paper 14 in the width direction 9, the portion lifted by the first main rib 35 </ b> G has higher rigidity than the central portion in the width direction 9. For this reason, of the three upstream contact members 62 constituting the central wave shape imparting portion 61A, the contact portions 62C of the two upstream contact members 62 adjacent to the first main ribs 35G are the virtual plane VF1. Move in a direction approaching. In such a state, the platen 35 is hardly pushed down in the direction away from the virtual plane VF1 by the urging force of the first coil spring 51 and the second coil spring 52.

  An image is recorded at a predetermined position below the recording unit 31 on the recording paper 14 to which the waveform shape along the width direction 9 is given by the upstream wave shape imparting mechanism 61. The recording paper 14 is infiltrated and swollen by recording an image, so that the rigidity is lowered and the recording paper 14 can be deformed relatively easily. In this case, not only the portion of the recording paper 14 to which the ink has adhered but also the upstream of the sheet conveyance direction 6, the rigidity is lowered and the state can be relatively easily deformed. For this reason, as shown in FIG. 8B, the recording paper 14 has an image recorded on the portion where the contact portion 62C of each upstream contact member 62 contacts in the upstream wave shape imparting mechanism 61. It is pushed down to a position farther from the virtual plane VF1 than before.

  Of the three upstream contact members 62 constituting the central wave shape imparting portion 61 </ b> A, the contact portion 62 </ b> C of the upstream contact member 62 located at the center portion in the width direction 9 is the width direction 9 on the recording paper 14. Is pushed down until it contacts the upper surface of the sub-rib 35H. On the other hand, the contact portions 62C of the upstream contact members 62 on both sides in the width direction 9 push the recording paper 14 down to a position lower than the upper surface of the sub-rib 35H. As a result, the recording paper 14 is waved in a relatively large uneven shape along the width direction 9.

  The recording sheet 14 on which the image is recorded is conveyed onto the downstream support portion 35B by being guided by the first guide portion 35C and the second guide portion 35S at the downstream end in the sheet conveyance direction 6. The recording sheet 14 conveyed onto the downstream support portion 35B is nipped and conveyed at the nip position NP2 between the first spur 43A and the discharge roller 42A, which are in a rotating state.

  At this time, the five first spurs 43A provided at positions corresponding to the downstream of the sheet conveyance direction 6 with respect to the central wave shape imparting portion 61A in the upstream wave shape imparting mechanism 61 are respectively in the width direction of the recording paper 14 9 is sandwiched with the discharge roller 42A.

  In addition, each of the two first spurs 43A provided at a position corresponding to the downstream side of the sheet conveyance direction 6 with respect to the side waveform imparting unit 61B in the upstream waveform imparting mechanism 61 includes the side waveform shaping unit 61B. Is provided at a position corresponding to the downstream side of the sheet conveying direction 6. For this purpose, each of the two first spurs 43A sandwiches a concave portion located outside the center of the recording paper 14 in the width direction 9 together with the lower discharge roller 42A.

  Accordingly, the recording paper 14 provided with the uneven shape along the width direction 9 in the upstream wave shape imparting mechanism 61 maintains the uneven shape also in the downstream wave shape imparting mechanism 41. As a result, even when ink infiltrates into the recording paper 14 and a part of the recording paper 14 swells on the platen main body portion 35A, the phenomenon of the sheet floating from the platen (cockling) can be suppressed.

  Next, the second spurs 44A arranged downstream of the sheet conveying direction 6 are brought into contact with the nip position NP2 of the recording paper 14 formed by all the first spurs 43A and the discharge rollers 42A. As a result, the recording paper 14 is more likely to be maintained in a wavy state along the width direction 9 even downstream of the discharge roller 42A and the first spur 43A in the conveyance direction 6. Thereafter, the recording paper 14 is discharged onto the paper discharge tray 17.

  Next, a case where an image is recorded on a postcard having a smaller size than the A4 size recording paper 14 will be described. The postcard is conveyed on the center reference along the feeding path 15 </ b> C in the feeding guide member 15 with the longitudinal direction along the sheet conveyance direction 6. Thereafter, the postcard is nipped at the nip position NP <b> 1 between the conveyance roller 22 and the pinch roller 26 in the conveyance roller pair 21 and conveyed onto the platen 35. At this time, as shown in FIG. 9, in the upstream wave shape imparting mechanism 61, the tips of the contact portions 62 </ b> C of the three upstream contact members 62 constituting the central wave shape imparting portion 61 </ b> A are the upper surfaces of the postcards 90. Abut.

  In this case, the center portion in the width direction 9 of the postcard 90 abuts on the protruding end of the sub-rib 35H located at the center portion in the width direction 9 of the platen main body portion 35A. Thereby, the contact portion 62C of the upstream contact member 62 pushes down the platen 35 in the direction away from the virtual plane VF1. As a result, the platen 35 is in the state shown in FIGS. 6 (B) and 7 (B).

  When the platen 35 is pushed down in a direction away from the virtual plane VS1, as shown in FIG. 7B, the restricting portion 35X provided in the downstream support portion 35B comes into contact with the discharge roller shaft 42B, so that the platen 35 is separated from the virtual plane VS1. Movement in the direction of leaving is restricted. Thereby, the platen 35 becomes a second position farther from the virtual plane VS1 than the first position.

  In such a state, the postcard 90 on the platen main body portion 35A is moved in the width direction 9 even if the respective contact portions 62C of the three upstream contact members 62 constituting the central wave shape imparting portion 61A are contacted. There is no risk of being wavy along.

  Even when the sheet having high rigidity is sized so as to abut each of the first main ribs 35G located on both outer sides in the width direction 9 with respect to the central wave shape imparting portion 61A, the central wave shape imparting portion 61A is provided. When the three upstream abutting members 62 constituting the abutment come into contact with each other, the platen 35 becomes a second position farther from the virtual plane VS1 than the first position. In this case, the projecting end of the first main rib 35G that protrudes to the conveyance path 29 has a shortest distance from the virtual plane VF1 that is farther from the nip position NP1 or substantially the same as the virtual plane VF1. Thereby, there is no possibility that a waveform will be given to a sheet with high rigidity.

  Thereafter, the postcard 90 records an image at a predetermined position below the recording unit 31. In addition, the postcard 90 is prevented from swelling of ink when it is coated.

  In this case, the contact portion 62C of the upstream contact member 62 located in the center portion in the width direction 9 contacts the center portion in the width direction 9 of the postcard 90 on the sub-rib 35H, and the platen 35 is separated from the virtual plane VS1. Move away. For this reason, the pressing force by the contact portion 62C is smaller than when the postcard 90 is placed on the main rib 35G. Thereby, the pressure applied to the postcard 90 by the contact portion 62C and the sub-rib 35H is reduced, and the postcard 90 is smoothly conveyed.

  The postcard 90 on which the image is recorded is conveyed onto the downstream support portion 35B. The postcard 90 transported onto the downstream support portion 35B is sandwiched and transported at the nip position NP2 between the first spur 43A and the discharge roller 42A that are in a rotating state. Thereafter, the second spur 44A comes into contact with the postcard 90, but the postcard 90 is discharged onto the paper discharge tray 17 without being waved.

[Effects of Embodiment]
In the present embodiment, the platen 35 is movable to the first position and the second position farther from the virtual plane VF1 than the first position, and the second main ribs 35K provided on the platen 35 are adjacent to the discharge rollers 42A. Arranged between. The protruding end of the second main rib 35K is closer to the virtual plane VF1 than the nip position NP2 of the first spur 43A and the discharge roller 42A, and the platen 35 is urged to the first position by the first coil spring 51 so that the platen 35 abuts. The part 35X contacts the discharge roller 42A.

  In this case, when the platen 35 moves from the first position to the second position against the urging force of the first coil spring 51, the nip position NP2 and the second main rib 35K project by the first spur 43A and the discharge roller 42A. The relative positional relationship with the edge varies. Thereby, a wave shape corresponding to the rigidity of the recording paper 14 can be provided. On the other hand, since the platen 35 is positioned at the first position with reference to the discharge roller shaft 42B, the nip position NP2 at the first position and the protruding end of the second main rib 35K are accurately positioned.

  Further, the plurality of second spurs 44A have projecting ends projecting toward the conveyance path 29 farther from the virtual plane VF1 than the projecting ends of the second main ribs 35K, and the virtual plane from the nip position NP1 in the discharge roller 42A and the first spur 43A. Close to VF1. Accordingly, the wave-shaped valley (concave portion) of the recording paper 14 is held by the second spur 44 </ b> A also downstream of the discharge roller 42 </ b> A in the conveyance direction 6.

  Further, the upstream contact member 62 is disposed at the same position as the first spur 43 </ b> A in the width direction 9, and is a first main rib disposed between contact portions of the adjacent upstream contact members 62 in the width direction 9. In 35G, the protruding end protruding to the conveyance path 29 is closer to the virtual plane VF1 than the protruding end of the upstream contact member 62 protruding to the conveyance path 29. As a result, the upstream contact member 62 and the first main rib 35G give a waveform to the recording paper 14 upstream of the nozzle 34 of the recording unit 31 in the transport direction 6.

  The contact portion 35 </ b> X provided on the platen 35 is provided at the downstream end of the platen 35 in the conveyance direction 6. As a result, the downstream end of the platen 35 in the transport direction 6 is accurately positioned by the contact portion 35X with reference to the discharge roller shaft 42B.

  Upstream of the recording unit 31 in the conveyance direction 6, a conveyance roller pair 22 that conveys the recording paper 14 in the conveyance direction 6, a roller holder 28 that supports the pinch roller 26 of the conveyance roller pair 22, and a platen 35 are urged. And a second coil spring 52 to be brought into contact with the roller holder 28. As a result, the upstream end of the platen 35 in the conveying direction 6 is accurately positioned with reference to the roller holder 28.

  The recording unit 31 and the upstream contact member 62 are supported by the first guide rail 36, and the first guide rail 36 and the discharge roller shaft 42 </ b> B are supported by the subframe 39. Thereby, the nozzle surface 34A of the recording unit 31, the discharge roller shaft 42B, and the upstream contact member 62 are accurately positioned.

  The contact portion of the upstream contact member 62 and the nip position NP1 are the same position in the width direction 9, and the shortest distance from the virtual plane VF1 is substantially the same. As a result, the distance between the recording sheet 14 and the nozzle surface 34 </ b> A that are waved upstream and downstream in the transport direction 6 from the nozzle 34 of the recording unit 31 is stabilized.

  The second main ribs 35 </ b> K and the upper first main ribs 35 </ b> G are continuously extended along the transport direction 6. Thereby, the 2nd main rib 35K and the upper 1st main rib 35G are simply realizable.

  When the platen 35 is in the second position, the projecting end of the first main rib 35G that protrudes to the conveyance path 29 has a shortest distance from the imaginary plane VF1 that is farther from the nip position NP1 or substantially the same as the imaginary plane VF1. Thereby, it is possible to hardly give a waveform to a sheet having high rigidity.

  The carriage 34 of the recording unit 31 is supported by the first guide rail 36 and is movable in the width direction 9 orthogonal to the transport direction 6 and parallel to the nozzle surface 34A. The recording head 33 mounted on the carriage 34 is a nozzle. 34. This facilitates positioning of the upstream contact member 62 and the like with respect to the nozzle 34.

[Modification]
The configuration of the recording unit 31 and the platen 35 is not limited to the configuration of the above embodiment. Further, the upstream contact member 62, the first main rib 35G, and the second spur 44A may not be provided. Furthermore, it is possible to adopt a configuration in which the conveyance roller pair 21 and the second coil spring 52 are not provided.

10 .... Machine 11 ...... Main body 14 ... Recording paper 21 ... Conveying roller pair 31 ... Recording unit 34 ... Nozzle 35 ... Platen (support) Element)
35G ... 1st main rib (1st contact member)
35K ... 2nd main rib (3rd contact member)
35X: abutting portion 36: first guide rail (first support frame)
39... Sub-frame (second support frame)
41 ... downstream wave shape imparting mechanism 42A ... discharge roller 42B ... discharge roller shaft 43A ... first spur 44A ... second spur 51 ...... first coil spring (first bias) Element)
52... Second coil spring (second biasing member)
61... Upstream wave shape imparting mechanism 62... Upstream contact member (second contact member)

Claims (10)

A recording unit that has a nozzle surface provided with nozzles and ejects ink droplets from the nozzles in order to record an image on a sheet that is conveyed in a conveying direction along a conveying path;
A plurality of discharge rollers disposed downstream of the recording unit in the transport direction, parallel to the nozzle surface and separated from each other in a width direction intersecting the transport direction;
A discharge roller shaft that supports and rotates the plurality of discharge rollers integrally;
A first spur disposed opposite to each of the plurality of discharge rollers;
A support member that is disposed to face the recording unit in the conveyance path and is movable to a first position and a second position farther from the virtual plane including the nozzle surface than the first position, and supports the sheet. When,
Provided on the support member, disposed between the adjacent discharge rollers in the width direction, and in a state where the support member is in the first position, a protruding end protruding into the conveyance path is A first abutting member closer to the imaginary plane than a nip position where the discharge roller and the spur pinch the sheet; and
A contact portion that is provided on the support member and contacts the discharge roller shaft in a state where the support member is in the first position;
An ink jet recording apparatus comprising: a first biasing member that biases the support member toward the first position. Further comprising a plurality of second spurs disposed downstream of the discharge roller in the transport direction and at the same position as the plurality of discharge rollers in the width direction;
The projecting ends of the plurality of second spurs projecting into the conveyance path are farther from the virtual plane than the projecting ends of the first contact member, and from the nip position where the discharge roller and the first spur sandwich the sheet. The ink jet recording apparatus according to claim 1, wherein the shortest distance to or near the virtual plane is the same. A second contact member disposed upstream of the nozzle in the transport direction and extending toward the support member, and disposed at the same position as the first spur in the width direction;
In the width direction, the protruding end that is disposed between the contact portions of the adjacent second contact members adjacent to each other, and the protruding end that protrudes to the transport path protrudes to the transport path of the second contact member. The inkjet recording apparatus according to claim 1, further comprising a third contact member closer to the virtual plane.   The ink jet recording apparatus according to claim 1, wherein the contact portion is provided at a downstream end of the support member in the transport direction. A pair of transport rollers that are disposed upstream of the recording unit in the transport direction and transport the sheet in the transport direction;
A roller holder for supporting one roller of the pair of conveying rollers;
The ink jet recording apparatus according to claim 1, further comprising a second urging member that urges the support member to abut against the roller holder. A first support frame that supports the recording unit; and a second support frame that supports the discharge roller shaft;
The second contact member is supported by the first support frame,
The inkjet recording apparatus according to claim 3, wherein the first support frame is supported by the second support frame.   The ink jet recording apparatus according to claim 3 or 6, wherein the contact portion of the second contact member and the nip position are the same position in the width direction, and the shortest distance from the virtual plane is substantially the same. .   The ink jet recording apparatus according to claim 3, 6 or 7, wherein the first contact member and the third contact member have a rib shape continuously extended along the transport direction.   In the state where the support member is in the second position, the projecting end from which the first contact member projects into the transport path is farther from the imaginary plane than the nip position, or the shortest distance from the imaginary plane is substantially the same. The ink jet recording apparatus according to claim 1, wherein: The recording part
A carriage supported by the first support frame and movable in a width direction that intersects the transport direction and is parallel to the nozzle surface;
The inkjet recording apparatus according to claim 6, further comprising: a recording head mounted on the carriage and having the nozzle.

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