JP7302156B2 - Inkjet recording device - Google Patents

Description

The present invention relates to an inkjet recording apparatus that records an image by ejecting ink from nozzles onto a sheet.

2. Description of the Related Art Conventionally, an inkjet recording apparatus that records an image by ejecting ink onto a sheet is known. 2. Description of the Related Art In an inkjet recording apparatus, a guide member for guiding a conveyed sheet and a contact member for contacting the sheet are arranged inside the apparatus. For example, Patent Document 1 discloses an inkjet printer including a roller holder (guide member) that supports a roller that guides a sheet positioned in a conveying path, and a contact member that imparts a wavy shape to the sheet by coming into contact with the sheet. A recording device is disclosed.

JP 2014-156079 A

In the inkjet recording apparatus disclosed in Patent Document 1, the roller holder and the contact member are individually attached to a guide rail, which is one of the frames of the apparatus. In this case, the variation in assembling the roller holder to the guide rail overlaps with the variation in assembling the contact member to the guide rail. For example, when the roller holder is assembled with the guide rail tilted to the right and the contact member is assembled with the guide rail tilted to the left, the tilt of the contact member with respect to the roller holder increases. end up Then, when the sheet guided by the rollers supported by the roller holder abuts against the abutting member, the sheet is deformed and bent or lifted, which may cause damage to the sheet or deterioration of the image recording result. be.

SUMMARY OF THE INVENTION The present invention has been made in view of the circumstances described above, and its object is to reduce the mounting error between a member for guiding a seat and a member that abuts on the seat, thereby reducing deformation of the seat. To provide means capable of reducing breakage and the like.

An inkjet recording apparatus according to the present invention is positioned in a sheet conveying path, and includes a pair of rollers for nipping and conveying a sheet in the conveying direction, and a pair of rollers positioned downstream in the conveying direction from the pair of rollers in the conveying path. a recording unit having a recording head for ejecting ink from nozzles onto the first surface of the sheet; No. 1 contact portion and the first contact portion are provided upstream in the transport direction from the first contact portion in the transport path with a gap therebetween in the transport direction, and are positioned on the transport path. a guide portion for guiding the sheet. The first contact portion and the guide portion are integrally molded products.

According to this configuration, since the first contact portion and the guide portion are integrally molded, it is possible to eliminate mounting errors between the first contact portion and the guide portion.

According to the present invention, it is possible to reduce deformation and breakage of the sheet.

FIG. 1 is a perspective view of a multifunction machine 10 that is an example of an embodiment of the invention. FIG. 2 is a longitudinal sectional view schematically showing the internal structure of the printer section 11. As shown in FIG. FIG. 3 is a perspective view of the recording section 24 and guide rails 56 and 57 in the internal structure of the printer section 11. As shown in FIG. FIG. 4 is a schematic cross-sectional view of the contact member 41, the platen 42, and the paper 12. As shown in FIG. FIG. 5 is a left side view schematically showing the contact member 41, the pinch roller 61, and the guide rail 56 in Modification 1. As shown in FIG. 6A is a left side view schematically showing the contact member 41, the pinch roller 61, and the guide rail 56 in Modification 2, and FIG. 6B is the contact member 41 in Modification 2. is a plan view schematically showing the. FIG. 7A is a left side view schematically showing the contact member 41, the pinch roller 61 and the guide rail 56 in Modification 3, and FIG. It is a sectional view showing a B section typically. FIG. 8 is a left side view schematically showing the contact member 41, the pinch roller 61, and the guide rail 56 in another embodiment of Modification 3. As shown in FIG. FIG. 9 is a left side view schematically showing the contact member 41, the transport roller pair 59, the guide rail 56, the roller holder 85, and the frame 93 in Modification 4. As shown in FIG.

Embodiments of the present invention will be described below. It should be noted that the embodiment described below is merely an example of the present invention, and it goes without saying that the embodiment of the present invention can be modified as appropriate without changing the gist of the present invention. In the following description, the vertical direction 7 is defined based on the state in which the multifunction device 10 is installed for use (the state in FIG. 1), and the side on which the opening 13 is provided is the front side (front). A direction 8 is defined, and a left-right direction 9 is defined when the MFP 10 is viewed from the front side (front). The up-down direction 7, the front-rear direction 8, and the left-right direction 9 are orthogonal to each other. In this embodiment, the up-down direction 7 corresponds to the vertical direction, and the front-rear direction 8 and the left-right direction 9 correspond to the horizontal direction.

[Overall Structure of MFP 10]
As shown in FIG. 1, the multi-function device 10 includes a housing 14 having a substantially rectangular parallelepiped appearance. The MFP 10 has various functions such as a facsimile function and a print function.

A scanner unit 17 is provided on the top of the housing 14 . The scanner unit 17 is configured as a so-called flatbed scanner, but detailed description of the internal configuration of the scanner unit 17 is omitted here.

A printer section 11 (an example of an inkjet recording apparatus) is provided in the lower portion of the housing 14 . The printer unit 11 has a print function of recording an image on a sheet 12 (an example of a sheet, see FIG. 2) by an inkjet method.

As shown in FIG. 2, inside the housing 14 are a pair of side frames 55 (see FIG. 3), guide rails 56 and 57, a feeding tray 20, a feeding section 16, an outer guide member 18, and an inner guide member. 19, a recording unit 24, a transport roller pair 59, a discharge roller pair 44, a contact member 41, and the like.

[flame]
As shown in FIG. 3 , at least two types of frames (a pair of side frames 55 and guide rails 56 and 57) are arranged inside the housing 14 . A pair of side frames 55 is an example of a second frame. The guide rail 56 is an example of a frame and an example of a first frame.

The pair of side frames 55 are arranged with an interval in the left-right direction 9 . The side frame 55 is arranged to the right of the transport path 65 and to the left of the transport path 65 . The side frame 55 is a metal frame.

The guide rails 56 and 57 are spaced apart in the front-rear direction 8 . The guide rails 56, 57 are metal frames. The guide rails 56 and 57 are supported by the pair of side frames 55 while being fixed to the pair of side frames 55 . Projections 69 formed on the side frame 55 are inserted into openings 68 formed on the guide rails 56 and 57 . Thereby, the guide rails 56 and 57 are fitted and fixed to the side frame 55 . The side frame 55 and the guide rails 56 and 57 may be fixed by means other than fitting, such as screws. Also, the side frame 55 and the guide rails 56 and 57 may be resin frames containing resin such as polyacetal (POM) as a main component instead of metal.

[Feed tray 20]
As shown in FIG. 1, an opening 13 is formed in the front of the printer section 11 . A feed tray 20 can be inserted into and removed from the printer section 11 through the opening 13 along the front-rear direction 8 . The feed tray 20 is arranged below the housing 14 when inserted into the printer section 11 . The feed tray 20 is a box-shaped member with an open top. A bottom plate 22 (see FIG. 2) of the feed tray 20 supports the sheets 12 in a stacked state.

A discharge tray 21 is supported above the front portion of the feed tray 20 . The paper 12 on which an image has been recorded by the recording unit 24 is discharged onto the upper surface of the discharge tray 21 .

[Feeding unit 16]
As shown in FIG. 2 , the feeding section 16 is provided above the bottom plate 22 of the feeding tray 20 inserted into the printer section 11 . The feeding section 16 includes a feeding roller 25 , a feeding arm 26 and a drive transmission mechanism 27 . The feed roller 25 is pivotally supported by the tip of the feed arm 26 . The feeding arm 26 rotates in the direction of an arrow 29 around a support shaft 28 provided at its proximal end. As a result, the feed roller 25 can contact and separate from the feed tray 20 or the paper 12 supported by the feed tray 20 .

The feed roller 25 is rotated by a driving force of a motor (not shown) transmitted by a drive transmission mechanism 27 formed by meshing a plurality of gears. As a result, of the sheets 12 supported by the bottom plate 22 , the uppermost sheet 12 in contact with the feed roller 25 is fed along the transport path 65 . Note that the drive transmission mechanism 27 is not limited to a form in which a plurality of gears are meshed, and may be a belt that is stretched over the support shaft 28 and the shaft of the feeding roller 25, for example.

[Conveyance path 65]
As shown in FIG. 2 , a transport path 65 extends from the rear end of the feed tray 20 . The transport path 65 consists of the curved portion 33 and the extending portion 34 . The curved portion 33 extends upward and forward from the rear end portion of the feed tray 20 while curving. The extending portion 34 is continuous with the upper end of the curved portion 33 and extends in the front-rear direction 8 .

The curved portion 33 is formed by an outer guide member 18 and an inner guide member 19 facing each other with a predetermined gap. The extending portion 34 is formed by the contact member 41 , the recording section 24 and the platen 42 .

The paper 12 supported by the feed tray 20 is fed by the feed roller 25 to the inclined plate 23 positioned behind the feed tray 20 . The inclined plate 23 changes the advancing direction of the paper 12 so that the paper 12 enters the curved portion 33 . The paper 12 that has entered the curved portion is transported so as to make a U-turn from the bottom to the top of the curved portion 33 and reaches the transport roller pair 59 (an example of a roller pair). The paper 12 nipped between the pair of conveying rollers 59 is conveyed forward with the extended portion 34 directed toward the recording section 24 . An image is recorded by the recording unit 24 on the paper 12 that has reached directly below the recording unit 24 . The paper 12 on which the image recording has been performed is conveyed forward along the extension portion 34 and discharged to the discharge tray 21 . As described above, the paper 12 is transported in the transport direction 15 indicated by the dashed-dotted arrow in FIG.

[Recording unit 24]
As shown in FIG. 2, the recording section 24 is provided above the extension portion 34 . A platen 42 is provided below the recording section 24 and at a position facing the recording section 24 .

As shown in FIG. 3, the platen 42 has a rib 43 (an example of a second contact portion) that stands upward from its upper surface and extends in the front-rear direction 8 . A plurality of ribs 43 are arranged at intervals in the left-right direction 9 (an example of the width direction) intersecting the conveying direction 15 (perpendicular to the conveying direction 15 in this embodiment). The ribs 43 support the paper 12 by coming into contact from below with the lower surface 12B (an example of the second surface) of the paper 12 conveyed along the extending portion 34 of the conveying path 65 (see FIG. 4).

As shown in FIG. 2, the recording section 24 has a carriage 40 and a recording head 38 . The carriage 40 is supported by guide rails 56 and 57 so as to be able to reciprocate in the horizontal direction 9 . The carriage 40 is arranged so as to straddle the guide rails 56 and 57 . A rear end portion of the carriage 40 is supported by a guide rail 56 . A front end portion of the carriage 40 is supported by a guide rail 57 .

A known belt mechanism (not shown) is arranged on the upper surface of the guide rail 57 . The belt mechanism includes pulleys arranged at both left and right ends of the guide rail 57 and a belt stretched over the pulleys. The belt is connected to the carriage 40 and a carriage drive motor (not shown). When the carriage drive motor is driven, a driving force in the left-right direction 9 is transmitted to the carriage 40 via the belt mechanism. As a result, the carriage 40 reciprocates in the left-right direction 9 .

The recording head 38 is mounted on the carriage 40 . Ink is supplied to the recording head 38 from an ink cartridge (not shown) or an ink tank (not shown) in which ink is stored. A plurality of nozzles 39 are formed on the lower surface 32 of the recording head 38 . While the carriage 40 is moving in the horizontal direction 9, the recording head 38 shoots ink droplets from the nozzles 39 toward the upper surface 12A (an example of the first surface, see FIG. 4) of the paper 12 supported by the platen 42. to dispense. An image is thus recorded on the paper 12 .

[Conveyance Roller Pair 59 and Discharge Roller Pair 44]
As shown in FIG. 2 , the transport roller pair 59 is arranged upstream in the transport direction 15 from the recording unit 24 in the extended portion 34 . The discharge roller pair 44 is arranged downstream in the conveying direction 15 from the recording unit 24 in the extended portion 34 .

The conveying roller pair 59 includes a conveying roller 60 (an example of a first roller) arranged below the extending portion 34 and a pinch roller 61 (a first roller) arranged above the extending portion 34 so as to face the conveying roller 60 . An example of two rollers). The conveying roller 60 rotates with the left-right direction 9 as its axial direction. A plurality of pinch rollers 61 are provided at intervals in the left-right direction 9 . Each pinch roller 61 follows the conveying roller 60 .

The transport roller 60 is rotatably supported by a pair of side frames 55 (see FIG. 3). The pinch roller 61 is rotatably supported by a later-described roller holder 85 in the contact member 41 .

The discharge roller pair 44 includes a discharge roller 62 arranged below the extension portion 34 and a spur 63 arranged above the extension portion 34 so as to face the discharge roller 62 . The discharge roller 62 and the spur 63 rotate with the lateral direction 9 as the axial direction. The spur 63 is pressed against the discharge roller 62 by an elastic member (not shown) such as a coil spring. The spur 63 follows the ejection roller 62 .

The conveying roller 60 and the discharge roller 62 are rotated by a driving force transmitted from a motor (not shown). The motor may be the same as or separate from the motor that applies the driving force to the feeding roller 25 . When the transport rollers 60 rotate while the paper 12 is nipped by the transport roller pair 59 , the paper 12 is transported onto the platen 42 in the transport direction 15 by the transport roller pair 59 . When the discharge rollers 62 rotate while the paper 12 is sandwiched between the paper 12 and the paper 12 , the paper 12 is transported onto the paper discharge tray 21 in the transport direction 15 by the paper 12 .

[Contact member 41]
As shown in FIG. 2 , the contact member 41 is arranged upstream in the transport direction 15 from the nozzles 39 of the recording section 24 in the transport path 65 .

The contact member 41 includes a plurality of extending portions 81 (see FIG. 3) and one guide portion 82 . The guide portion 82 extends in the left-right direction 9 , and the plurality of extending portions 81 extend generally forward from the guide portion 82 at intervals in the left-right direction 9 .

In this embodiment, each contact member 41 is an integrally molded product whose main component is a resin such as polyacetal (POM). That is, in this embodiment, the plurality of extending portions 81 and one guide portion 82 are integrally formed.

As shown in FIGS. 2 and 3, the contact member 41 includes a front projection 83 and a plurality of rear projections 84. As shown in FIGS. The front projection 83 and the rear projection 84 protrude upward from the upper surface of the guide portion 82 . Each tip of the front projection 83 and the rear projection 84 is bent.

The guide rail 56 is formed with openings 66 corresponding to the front projections 83 and openings 67 corresponding to each of the rear projections 84 . The front projection 83 is engaged with the guide rail 56 by inserting the front projection 83 into the opening 66 and supporting the tip of the front projection 83 on the upper surface of the guide rail 56 . Further, the rear projection 84 is engaged with the guide rail 56 by inserting the rear projection 84 into the opening 67 and supporting the tip of the rear projection 84 on the upper surface of the guide rail 56 . Thereby, the contact member 41 is attached to the guide rail 56 .

Note that the opening 66 is larger than the front protrusion 83 and the opening 67 is larger than the rear protrusion 84 . As a result, in a state in which the contact member 41 is assembled to the guide rail 56, the contact member 41 can rotate with respect to the guide rail 56 around the portion where the front projection 83 and the rear projection 84 are provided. is.

The means for assembling the contact member 41 to the guide rail 56 is not limited to engagement by the front projection 83, the rear projection 84, and the openings 66 and 67. For example, the number and positions of the front projections 83 and the rear projections 84 included in the contact member 41 are not limited to those shown in FIG. Further, for example, the attachment of the contact member 41 to the guide rail 56 may be performed by means other than engagement such as adhesion.

[Extension part 81]
As shown in FIGS. 3 and 4 , each extension 81 is arranged between adjacent ribs 43 in the left-right direction 9 . That is, the extending portions 81 and the ribs 43 are alternately arranged along the left-right direction 9 .

Each extension 81 has the same configuration. Therefore, in principle, the configuration of one extending portion 81 will be described in the following description.

As shown in FIG. 2 , the extending portion 81 constitutes the front portion of the contact member 41 . The extending portion 81 extends downward and forward from the guide portion 82 while curving.

The extending portion 81 extends between the conveying roller pair 59 and the nozzle 39 in the extending portion 34 . In other words, the tip portion 81A (an example of the first contact portion) of the extension portion 81 is located between the conveying roller pair 59 and the nozzle 39 in the extension portion 34 . The tip portion 81A extends further downstream in the transport direction 15 than the upstream end of the rib 43 in the transport direction 15 .

As shown in FIG. 4 , the tip portion 81A is positioned below the upper end of the rib 43 . The tip portion 81A abuts on the upper surface 12A of the paper 12 conveyed through the extension portion 34 between the conveying roller pair 59 and the nozzle 39 in the extension portion 34 . Further, the rib 43 contacts the lower surface 12B of the paper 12 conveyed along the extension 34 between the conveying roller pair 59 and the nozzle 39 in the extension 34 . The paper 12 is formed into a wavy shape that continues in the left-right direction 9 by being brought into contact with the tip portion 81A from above and with the rib 43 from below. As described above, the tip portion 81</b>A and the rib 43 cooperate with each other to give the paper 12 a corrugated shape along the left-right direction 9 .

[Guide part 82]
The guide portion 82 defines part of the extension portion 34 of the transport path 65 . In other words, the guide portion 82 is for guiding the paper 12 positioned on the extension portion 34 .

As shown in FIG. 2 , the guide portion 82 constitutes the rear portion of the contact member 41 . That is, the guide portion 82 is positioned upstream in the transport direction 15 from the extension portion 81 . The guide portion 82 is spaced apart from the leading end portion 81A of the extension portion 81 in the conveying direction 15 .

The guide portion 82 includes a roller holder 85 (an example of a roller holder) and a guide surface 86 .

The roller holder 85 constitutes the front portion of the guide portion 82 . A through hole 87 is formed in the roller holder 85 . A shaft 61 A of the pinch roller 61 is inserted into the through hole 87 . Thereby, the roller holder 85 rotatably supports the pinch roller 61 . When the roller holder 85 supports the pinch roller 61 , a portion of the outer peripheral surface of the pinch roller 61 is located below the lower surface of the roller holder 85 .

The guide surface 86 is a portion of the lower surface of the guide portion 82 located upstream in the transport direction 15 from the roller holder 85 in the extension portion 34 . The guide surface 86 is inclined with respect to the front-rear direction 8 so as to extend downward toward the downstream in the transport direction 15 . That is, the position of the guide surface 86 in the vertical direction 7 approaches the position where the pinch roller 61 and the transport roller 60 contact (in other words, the nip position of the transport roller pair 59) as it goes downstream in the transport direction 15 . That is, the guide surface 86 is a surface that guides the paper 12 conveyed in the conveying direction 15 toward the nip position of the conveying roller pair 59 .

[Coil spring 88]
A coil spring 88 (an example of a biasing member) is provided between the roller holder 85 and the guide rail 56 . A lower end of the coil spring 88 is connected to the upper surface of the roller holder 85 . A top end of the coil spring 88 is connected to the bottom surface of the guide rail 56 .

When the pinch roller 61 is in contact with the conveying roller 60, the coil spring 88 is shorter than its natural length. In this state, the coil spring 88 urges the contact member 41 downward. That is, the coil spring 88 urges the pinch roller 61 toward the conveying roller 60 via the roller holder 85 . When the coil spring 88 contracts, an upward biasing force acts on the contact member 41 . At this time, the biasing force of the pinch roller 61 against the conveying roller 60 is reduced. When the coil spring 88 is further compressed, the contact member 41 rotates so that the pinch roller 61 moves upward. As a result, the pinch roller 61 is separated from the conveying roller 60 .

The member that urges the pinch roller 61 toward the conveying roller 60 may be a member other than the coil spring 88, such as a plate spring.

[Effects of Embodiment]
According to this embodiment, since the extension part 81 and the guide part 82 are integrally molded, mounting errors of the extension part 81 and the guide part 82 can be eliminated.

Further, according to the present embodiment, the extending portion 81 and the guide portion 82 can be positioned by the guide rails 56 .

Also, if the position of the extending portion 81 is fixed, when a thick sheet of paper is nipped by the conveying roller pair 59, the thick sheet of paper will be positioned closer to the leading end portion 81A of the extending portion 81 than the thin sheet of paper. . Therefore, the pressing force of the leading end portion 81A on thick paper is greater than the pressing force of the leading end portion 81A on thin paper. As a result, the transport resistance of the leading end portion 81A to the thick paper increases.

Therefore, in this embodiment, when a thick paper is nipped by the conveying roller pair 59, the pinch roller 61, the roller holder 85, and the extending portion 81 are urged in the direction (downward) against the urging force of the coil spring 88. ) and in the opposite direction (upward). As a result, when a thick sheet of paper is conveyed, the conveying resistance of the leading end portion 81A of the extension portion 81 against the thick sheet of paper can be weakened.

Further, according to this embodiment, the guide surface 86 can guide the paper 12 to the nip position between the transport roller pair 59 .

Further, according to the present embodiment, by making the paper 12 wavy along the left-right direction 9, the rigidity of the paper 12 can be improved, and deformation such as bending and lifting of the paper 12 can be suppressed.

In addition, according to the present embodiment, the guide rail 56 to which at least one of the extension portion 81 and the guide portion 82 is assembled serves to move one of the two rollers (the transport roller 60 in the present embodiment) constituting the transport roller pair 59. It is fixed to a pair of supporting side frames 55 . Accordingly, the positional accuracy of at least one of the extension portion 81 and the guide portion 82 with respect to one of the two rollers forming the conveying roller pair 59 can be maintained satisfactorily.

[Modification 1]
In the above-described embodiment, the contact member 41 is rotatable with respect to the guide rail 56 when assembled to the guide rail 56 , and the rotation of the contact member 41 causes the pinch roller 61 to move. However, the contact member 41 may be fixed to the guide rail 56 as shown in FIG. Although FIG. 5 omits a specific configuration for fixing the contact member 41 to the guide rail 56, this configuration can be realized by known means such as fitting and bonding.

5, the roller holder 85 of the guide portion 82 of the contact member 41 is formed with an elongated hole 89 which is a through hole extending in the vertical direction 7 . A shaft 61 A of the pinch roller 61 is inserted into the long hole 89 . Thereby, the roller holder 85 supports the pinch roller 61 so as to be rotatable and movable in the vertical direction 7 .

5, a coil spring 90 (an example of a biasing member) is provided between the pinch roller 61 and the guide rail 56. As shown in FIG. A lower end of the coil spring 90 is connected to the upper surface of the pinch roller 61 . The upper end of the coil spring 90 is connected to the lower surface of the guide rail 56 .

When the pinch roller 61 is in contact with the conveying roller 60, the coil spring 88 is shorter than its natural length. In this state, the coil spring 88 urges the pinch roller 61 downward. That is, the coil spring 88 urges the pinch roller 61 toward the conveying roller 60 . When the coil spring 88 contracts, an upward biasing force acts on the pinch roller 61 . As a result, the biasing force of the pinch roller 61 against the conveying roller 60 is reduced. Further contraction of the coil spring 88 causes the pinch roller 61 to move upward. As a result, the pinch roller 61 is separated from the conveying roller 60 .

According to Modification 1, since the pinch rollers 61 move individually with respect to the extending portion 81, the position of the leading end portion 81A of the extending portion 81 can be kept constant regardless of the thickness of the paper 12. .

[Modification 2]
Although the contact member 41 is an integrally molded product in the above-described embodiment, the contact member 41 may be composed of a plurality of members.

For example, as shown in FIG. 6, the extending portion 81 and the guide portion 82 may be separate members. In the configuration of FIG. 6, the guide portion 82 is attached to the guide rail 56 by known means such as fitting or adhesion. The extending portion 81 is detachably attached to the guide portion 82 by known means such as fitting and fastening. 6, a concave portion 91 is formed in the front upper end portion of the guide portion 82, and the extending portion 81 is attached to the guide portion 82 by fitting the base end portion 81B of the extending portion 81 into the concave portion 91. be done.

When the extension 81 is attached to the guide 82 , a right surface 811 , a left surface 812 , a rear surface 813 , a bottom surface 814 and a front surface 815 of the extension 81 are in contact with inner surfaces defining the recess 91 . Thereby, the extending portion 81 is positioned in the vertical direction 7 , the front-rear direction 8 , and the left-right direction 9 with respect to the guide portion 82 .

6 and later-described configurations of FIGS. 7 and 8 are similar to the configuration of FIG. 61 is rotatably and vertically movably supported. However, the configurations of FIGS. 6 to 8 are not limited to such a configuration. For example, similar to the configuration of FIG. The roller 61 may be rotatably supported, and the pinch roller 61 may be moved by the movement of the guide portion 82 .

According to Modification 2, since the extension 81 is attached to the guide 82, the attachment error between the extension 81 and the guide 82 can be reduced. Also, the extending portion 81 and the guide portion 82 can be individually replaced.

[Modification 3]
Although the contact member 41 is an integrally molded product in the above-described embodiment, the contact member 41 may be composed of a plurality of members. Further, in Modification 2, only the guide portion 82 of the extension portion 81 and the guide portion 82 is attached to the guide rail 56, but each of the extension portion 81 and the guide portion 82 is attached to the guide rail 56. may have been

For example, as shown in FIG. 7, the base end portion 81B of the extension portion 81 may be inserted between the guide rail 56 and the guide portion 82 in the vertical direction 7 . In the configuration shown in FIG. 7, the extension 81 has projections 101 and the guide portion 82 has projections 102 . Note that the number of protrusions 101 and 102 is arbitrary. Each tip of the projections 101 and 102 is bent. The guide rail 56 has an opening 103 corresponding to each projection 101 and an opening 104 corresponding to each projection 102 .

The protrusion 101 is engaged with the guide rail 56 by inserting the protrusion 101 into the opening 103 and supporting the tip of the protrusion 101 on the upper surface of the guide rail 56 . Thereby, the extending portion 81 is assembled to the guide rail 56 . Further, the protrusion 102 is engaged with the guide rail 56 by inserting the protrusion 102 into the opening 104 and supporting the tip of the protrusion 102 on the upper surface of the guide rail 56 . Thereby, the guide portion 82 is assembled to the guide rail 56 . An opening 109 is formed in the extending portion 81 at a position corresponding to the protrusion 102 . This allows the projection 102 to pass through the opening 104 of the guide rail 56 without interfering with the extension 81 .

The extending portion 81 has a convex portion 105 . The convex portion 105 protrudes downward from the lower surface of the base end portion 81B of the extension portion 81 . The projection 105 has a length in the left-right direction 9 that is longer than a length in the front-rear direction 8 and extends in the left-right direction 9 .

A concave portion 106 is formed in the guide portion 82 . The recessed portion 106 is recessed downward from the upper surface 82A of the guide portion 82 . The concave portion 106 is formed at a position corresponding to the convex portion 105 . The concave portion 106 is formed in a shape corresponding to the convex portion 105 . That is, similarly to the convex portion 105 , the concave portion 106 extends in the horizontal direction 9 with the length in the horizontal direction 9 being longer than the length in the front-rear direction 8 . That is, a front inner surface 106A that defines the front end of the recess 106 and a rear inner surface 106B that defines the rear end of the recess 106 are surfaces extending in the left-right direction 9 . The front inner surface 106A and the rear inner surface 106B are surfaces facing each other with a space therebetween in the front-rear direction 8 . The front inner surface 106A and the rear inner surface 106B are examples of a pair of surfaces.

The projection 105 is inserted into the recess 106 when the extension 81 and the guide 82 are assembled to the guide rail 56 . In this state, the front inner surface 106A contacts the front surface of the projection 105 from the front, and the rear inner surface 106B contacts the rear surface of the projection 105 from the rear. That is, in this state, the front inner surface 106A and the rear inner surface 106B are in contact with the convex portion 105 with the convex portion 105 sandwiched therebetween. Thereby, the extending portion 81 and the guide portion 82 are positioned relative to each other.

In addition, in the configuration shown in FIG. 7 , the length of the projection 105 and the recess 106 in the left-right direction 9 is longer than the length in the front-rear direction 8 and extends in the left-right direction 9 . However, the configuration of the convex portion 105 and the concave portion 106 is not limited to this. For example, the convex portion 105 and the concave portion 106 may be longer in the front-rear direction 8 than in the left-right direction 9 and extend in the front-rear direction 8 .

Further, contrary to the configuration shown in FIG. 7, the guide portion 82 may be provided with the convex portion 105 and the extending portion 81 may be formed with the concave portion 106 .

Further, as shown in FIG. 8, in a state where the extension portion 81 and the guide portion 82 are assembled to the guide rail 56, the two projections 107 and 108 provided instead of the recess 106 are aligned with the projection 105. can be inserted. In this case, the rear surface 107A of the projection 107 and the front surface 108A of the projection 108 are in contact with the projection 105 with the projection 105 sandwiched therebetween. In this case, the rear surface 107A and the front surface 108A correspond to a pair of surfaces. In this case, the extending portion 81 may include two convex portions 107 and the guide portion 82 may include the convex portion 105, contrary to the configuration shown in FIG.

According to Modification 3, since the extending portion 81 is in contact with the guide portion 82 while being attached to the guide rail 56, the mounting error between the extending portion 81 and the guide portion 82 can be reduced. can. Also, the extending portion 81 and the guide portion 82 can be individually replaced.

Further, according to Modification Example 3, since the front inner surface 106A and the rear inner surface 106B of the concave portion 106 sandwich the convex portion 105, in the direction in which the front inner surface 106A and the rear inner surface 106B face each other (the front-rear direction 8), the A mounting error between the projecting portion 81 and the guide portion 82 can be reduced.

Further, according to Modification 3, since the convex portion 105, the front inner surface 106A, and the rear inner surface 106B extend in the left-right direction 9 orthogonal to the conveying direction 15, the extending portion The mounting error between the 81 and the guide portion 82 can be reduced.

[Modification 4]
In the embodiment described above, the pinch roller 61 was positioned above the transport roller 60 . However, as shown in FIG. 9, the pinch rollers 61 may be positioned below the transport rollers 60 .

In the configuration shown in FIG. 9 , the guide portion 82 of the contact member 41 does not support the transport roller 60 . The conveying roller 60 is rotatably supported by the pair of side frames 55 . Also, the contact member 41 does not support the pinch roller 61 . That is, in the configuration shown in FIG. 9, the guide portion 82 does not have the roller holder 85 . A roller holder 85 that rotatably supports the pinch roller 61 is provided as a separate member from the contact member 41 . The roller holder 85 is provided below the contact member 41 so as to face the contact member 41 . The roller holder 85 has a guide surface 92 .

The guide surface 92 is a portion of the upper surface of the roller holder 85 located upstream in the transport direction 15 from the pinch roller 61 in the extension portion 34 . The guide surface 92 is inclined with respect to the front-rear direction 8 so as to go upward as it goes downstream in the transport direction 15 . The guide surface 92 is a surface that guides the paper 12 conveyed in the conveying direction 15 toward the nip position of the conveying roller pair 59 .

The configuration of the roller holder 85 shown in FIG. 9 is vertically symmetrical with the roller holder 85 shown in FIG. It has substantially the same configuration as the roller holder 85 shown in FIG. Therefore, further detailed description is omitted here.

In addition, in the configuration shown in FIG. 9 , the contact member 41 may rotatably support the transport roller 60 .

[Other Modifications]
In the above-described embodiment, the contact member 41 includes a plurality of extending portions 81 and one guide portion 82 , and the plurality of extending portions 81 extend from one guide portion 82 . However, the contact member 41 is not limited to the configuration described above. For example, the printer section 11 may include a plurality of contact members 41 and each of the plurality of contact members 41 may include one extension portion 81 and one guide portion 82 .

In the above-described embodiment, the contact member 41 is attached to the guide rail 56 , but the contact member 41 may be attached to a frame other than the guide rail 56 arranged inside the printer section 11 .

In the above-described embodiment, the extending portion 81 functions in cooperation with the rib 43 to give the paper 12 a corrugated shape along the left-right direction 9 . However, the extending portion 81 does not have to function to give the paper 12 a corrugated shape. For example, the extending portion 81 may simply function as something that contacts the paper 12 from above and pushes it downward. In this case, the platen 42 may not have ribs 43 .

In embodiments other than Modification 4, the guide portion 82 of the contact member 41 includes the roller holder 85 and the guide surface 86 . However, the guide portion 82 may have only one of the roller holder 85 and the guide surface 86 .

11 Printer unit (inkjet recording device)
12 Paper (sheet)
12A... Top surface (first surface)
15 Conveyance direction 24 Recording unit 38 Recording head 39 Nozzle 59 Conveying roller pair (roller pair)
65... Conveyance path 81... Extension part 81A... Tip part (first contact part)
82... Guide part

Claims (11)

a pair of rollers located in a sheet conveying path, which nips the sheet and conveys the sheet in the conveying direction;
a recording unit located downstream of the pair of rollers in the conveying path in the conveying direction and having a recording head that ejects ink from nozzles onto the first surface of the sheet;
a platen disposed at a position facing the recording unit and supporting a second surface, which is the back surface of the first surface of the sheet;
a first contact portion facing the platen between the roller pair and the nozzle in the conveying path and contacting the first surface of the sheet;
The first surface of the sheet positioned in the transport path is provided upstream in the transport direction from the first contact part in the transport path and is spaced apart from the first contact part in the transport direction. and a guide portion for guiding the
The inkjet recording apparatus, wherein the first contact portion and the guide portion are integrally molded. 2. The inkjet recording apparatus according to claim 1, further comprising a frame to which the first contact portion and the guide portion are assembled. a pair of rollers located in a sheet conveying path, which nips the sheet and conveys the sheet in the conveying direction;
a recording unit located downstream of the pair of rollers in the conveying path in the conveying direction and having a recording head that ejects ink from nozzles onto the first surface of the sheet;
a platen disposed at a position facing the recording unit and supporting a second surface, which is the back surface of the first surface of the sheet;
a first contact portion facing the platen between the roller pair and the nozzle in the conveying path and contacting the first surface of the sheet;
The first surface of the sheet positioned in the transport path is provided upstream in the transport direction from the first contact part in the transport path and is spaced apart from the first contact part in the transport direction. a guide section for guiding the
comprising a frame and
The guide portion is attached to the frame,
The inkjet recording apparatus, wherein the first contact portion is detachably attached to the guide portion. a pair of rollers located in a sheet conveying path, which nips the sheet and conveys the sheet in the conveying direction;
a recording unit located downstream of the pair of rollers in the conveying path in the conveying direction and having a recording head that ejects ink from nozzles onto the first surface of the sheet;
a platen disposed at a position facing the recording unit and supporting a second surface, which is the back surface of the first surface of the sheet;
a first contact portion facing the platen between the roller pair and the nozzle in the conveying path and contacting the first surface of the sheet;
The first surface of the sheet positioned in the transport path is provided upstream in the transport direction from the first contact part in the transport path and is spaced apart from the first contact part in the transport direction. a guide section for guiding the
comprising a frame and
The guide portion is attached to the frame,
The inkjet recording apparatus, wherein the first contact portion is attached to the frame while being in contact with the guide portion. One of the first contact portion and the guide portion includes a convex portion,
5. The inkjet recording apparatus according to claim 4, wherein the other of the first contact portion and the guide portion has a pair of surfaces that contact the convex portion with the convex portion sandwiched therebetween. 6. The inkjet recording apparatus according to claim 5, wherein the convex portion and the pair of surfaces extend in a width direction that intersects with the conveying direction. The roller pair is
a first roller;
a second roller that sandwiches the sheet between itself and the first roller and conveys the sheet in the conveying direction;
The guide section includes a roller holder that rotatably supports the second roller,
The inkjet recording apparatus according to any one of claims 1 to 6, further comprising a biasing member that biases the roller holder toward the first roller. The roller pair is
a first roller;
a second roller that sandwiches the sheet between itself and the first roller and conveys the sheet in the conveying direction;
The guide section includes a roller holder that supports the second roller so as to be rotatable and capable of contacting and separating from the first roller,
7. The inkjet recording apparatus according to any one of claims 1 to 6, further comprising a biasing member that biases the second roller toward the first roller. 9. Any one of claims 1 to 8, wherein the guide portion includes a guide surface located upstream of the roller pair in the transport direction in the transport path and guiding the sheet toward a nip position of the sheet by the roller pair. The inkjet recording apparatus described. further comprising a plurality of second contact portions that contact the second surface of the sheet between the roller pair and the nozzle in the conveying path and are spaced apart in a width direction that intersects with the conveying direction;
A plurality of the first contact portions are provided,
Each of the plurality of first abutting portions contacts the sheet between the plurality of second abutting portions in the width direction, so that the sheet moves in cooperation with the plurality of second abutting portions. 10. The ink jet recording apparatus according to any one of claims 1 to 9, which imparts a wave shape along the width direction. a first frame to which at least one of the first contact portion and the guide portion is assembled;
a second frame in which one of the two rollers constituting the roller pair is rotatably supported;
The inkjet recording apparatus according to any one of claims 1 to 10, wherein the first frame is fixed to the second frame.

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