JP6171690B2 - Liquid ejection device - Google Patents

Description

  The present invention relates to a liquid ejection apparatus that ejects a liquid such as ink.

  In the liquid ejection apparatus, the plurality of liquid ejection heads each having an ejection surface, wherein each ejection surface is arranged in two rows along a paper width direction orthogonal to the transport direction and belongs to different rows However, there are known ones including a plurality of liquid ejection heads arranged at positions different from each other in the paper width direction and the conveyance direction (see Patent Document 1).

  Also, a technique for imparting a wave shape along the main scanning direction to the recording medium for the purpose of giving the recording medium a waist in a liquid ejection apparatus is known (see Patent Document 2). According to this technique, by giving a waist to the recording medium, the posture of the recording medium is stabilized, and problems such as the recording medium contacting the liquid ejection head can be suppressed. In Patent Document 2, a liquid discharge head discharges liquid while scanning in the main scanning direction, and records an image on a recording medium.

JP 2010-208241 A JP-A-9-48161

  The inventor of the present application has studied to give a waist to a recording medium as in Patent Document 2 in a configuration including a plurality of liquid discharge heads as in Patent Document 1. However, in the technique of Patent Document 2, the liquid ejection head ejects liquid while scanning in the main scanning direction on a recording medium to which a wave shape along the main scanning direction is applied. That is, in the recording medium, a wave-shaped concave and convex are mixedly formed in a portion arranged at a position facing the discharge area of the discharge surface. In this case, even if the recording medium can be stiffened, the recording quality is deteriorated because the distance between the recording medium and the ejection surface is not constant at the position facing the ejection area.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid ejecting apparatus capable of suppressing a decrease in recording quality while giving a waist to a recording medium in a configuration including a plurality of liquid ejecting heads.

  In order to achieve the above object, according to an aspect of the present invention, a plurality of liquid discharge heads each having a discharge surface including a discharge region in which a plurality of discharge ports for discharging a liquid are formed, each of the discharge heads Surfaces are arranged in a plurality of rows along the first direction, and the discharge surfaces belonging to different rows are related to the first direction and the second direction perpendicular to the first direction and parallel to the discharge surface. A plurality of liquid ejection heads arranged at different positions, and a conveyance unit configured to convey the recording medium in the second direction so that the recording medium faces each of the plurality of ejection surfaces; A wave shape imparting section configured to impart a wave shape along at least the first direction to the recording medium on the upstream side in the second direction of at least one of the plurality of rows; Comprising The shape imparting unit has a first contact point configured to be in contact with the recording medium, and a third contact unit configured to be in contact with the recording medium and orthogonal to the first direction and the ejection surface. A second contact portion having a second contact point arranged at a position different from the first contact point with respect to a direction, and each of the discharge regions in the plurality of discharge surfaces belonging to the first row. One of the first contact portion and the second contact portion is disposed upstream in the two directions, and the two discharge surfaces adjacent to the first direction among the plurality of discharge surfaces belonging to the one row. The other of the first contact portion and the second contact portion is disposed upstream of the region between the discharge regions in the second direction.

  According to the said viewpoint, a waist can be given to a recording medium by providing the waveform along a 1st direction with respect to a recording medium. In addition, one of the first contact portion and the second contact portion is disposed on the upstream side in the second direction of the discharge region in each of the plurality of discharge surfaces belonging to the first row, and belongs to the first row. The other of the first contact portion and the second contact portion is disposed on the upstream side in the second direction of the region between the discharge regions on the two discharge surfaces adjacent to each other in the first direction among the plurality of discharge surfaces. Thereby, a wave-shaped concave and convex are not mixedly formed in a portion arranged at a position facing the ejection area in the recording medium, and a decrease in recording quality can be suppressed. That is, according to the above configuration, in a configuration including a plurality of liquid ejection heads, it is possible to suppress a decrease in recording quality while giving the recording medium stiffness.

  The one side may have a length greater than or equal to the length of the corresponding ejection region with respect to the first direction. In this case, it is possible to prevent a waveform from being formed in a portion of the recording medium that is disposed at a position facing the ejection region, and to more reliably suppress a decrease in recording quality. In other words, the portion of the recording medium that is disposed at a position facing the ejection area is substantially flat in the main scanning direction, so that deterioration in recording quality can be suppressed.

  The first contact point and the second contact point may be arranged at different positions with respect to the second direction. When the first contact point and the second contact point are arranged at the same position in the second direction, a wave shape is abruptly applied to the recording medium conveyed in the second direction. On the other hand, in the case of the above configuration, a wave shape is gradually given to the recording medium conveyed in the second direction. That is, in the case of the above configuration, the first contact point and the second contact point are corrugated with respect to the recording medium while suppressing the load on the recording medium as compared with the case where the first contact point and the second contact point are arranged at the same position in the second direction. Can be granted.

  The first contact portion includes a first roller pair that sandwiches the recording medium at the first contact point, and the second contact portion includes a second roller pair that sandwiches the recording medium at the second contact point. It's okay. In this case, by sandwiching the recording medium by the first roller pair and the second roller pair, it is possible to accurately give the recording medium a wave shape along the first direction. As a result, the waist of the recording medium can be strengthened and the posture of the recording medium can be further stabilized.

  The first roller pair and the second roller pair may be arranged at different positions with respect to the first direction. In this case, the first roller pair and the second roller pair can positively impart a wave shape along the first direction to the recording medium. Thereby, the waist of the recording medium can be made stronger and the posture of the recording medium can be further stabilized with a relatively simple configuration.

  The first roller pair may be arranged upstream of the second roller pair in the second direction.

  Of the two rollers facing the third direction constituting the second roller pair, the shaft of one roller disposed on the upstream side in the fourth direction, which is the liquid discharge direction from the plurality of discharge ports, You may arrange | position in the said 2nd direction downstream rather than the axis | shaft of the other roller. In this case, the recording medium sandwiched between the second roller pair is conveyed downstream in the second direction and the fourth direction. Accordingly, the front end of the recording medium is located upstream in the fourth direction (that is, in a direction approaching the ejection surface) at a position facing the ejection area of the ejection surface disposed on the downstream side in the second direction of the second roller pair. Floating is suppressed and recording can be performed stably.

  The wave shape imparting portion is disposed between at least two rows adjacent in the second direction, and the two of the two rollers facing the third direction constituting the first roller pair, The shaft of one roller disposed on the upstream side in the fourth direction, which is the direction of liquid ejection from the plurality of ejection ports, may be disposed on the upstream side in the second direction with respect to the shaft of the other roller. In this case, the recording medium sandwiched between the first roller pair is conveyed upstream in the second direction and the fourth direction. Accordingly, the rear end of the recording medium is located upstream in the fourth direction (that is, in a direction approaching the discharge surface) at a position facing the discharge area of the discharge surface disposed on the upstream side in the second direction of the first roller pair. ) Floating is suppressed and recording can be performed stably.

  The wave shape imparting section may be disposed between at least two rows adjacent in the second direction. The recording medium tends to become weak due to the landing of liquid. According to the above configuration, the liquid is landed at a position facing the ejection area of the ejection surface belonging to the upstream row in the second direction of the two rows adjacent in the second direction, and the recording medium is weakened. Then, the wave shape imparting unit imparts the wave shape and gives the waist. Accordingly, it is possible to stably perform recording at a position facing the ejection area of the ejection surface belonging to the downstream row in the second direction of the two rows.

  In the liquid ejection device according to the present invention, the wave shape of the recording medium may be formed on the downstream side of the upstream row of the two adjacent rows and the upstream side of the wave shape imparting unit with respect to the second direction. A wave shape canceling unit configured to cancel may be further included. In this case, with respect to the second direction, by providing a wave shape canceling portion between the discharge surface belonging to the upstream row and the wave shape imparting portion, the discharge area of the discharge surface belonging to the upstream row At the opposing positions, the influence of the waveform imparted by the waveform imparting unit can be suppressed, and recording can be performed stably.

  The corrugated cancellation unit has a plurality of third contact points configured to come into contact with a recording medium, and the plurality of third contact points are arranged along the first direction, and You may arrange | position in the mutually same position regarding 3 directions. In this case, the influence of the corrugation imparted by the corrugation imparting section can be more reliably suppressed at a position facing the ejection region of the ejection surface belonging to the upstream row.

  The wave shape canceling unit may include a third roller pair that sandwiches the recording medium at the plurality of third contact points. In this case, the waveform of the recording medium can be canceled with high accuracy by sandwiching the recording medium by the third roller pair. As a result, the influence of the wave shape can be more reliably suppressed at the position facing the discharge area of the discharge surface belonging to the upstream row.

  The one side may include a spur having a plurality of protrusions on the outer peripheral surface and a roller having no protrusion on the outer peripheral surface. The spur has a smaller contact area with the recording medium than the roller. The roller has a larger contact area with the recording medium and a greater force for holding the recording medium than the spur. Therefore, according to the said structure, the deterioration of the recording quality by contacting a recording medium is suppressed by employ | adopting a spur. In addition, by adopting a roller, stable conveyance can be realized.

  The spur is arranged at a position overlapping with the discharge area on the discharge surface belonging to the row arranged upstream in the second direction of the two adjacent rows with respect to the second direction. The two adjacent rows may be arranged at positions that do not overlap with the ejection region on the ejection surface belonging to the row arranged upstream in the second direction with respect to the second direction. In this case, the spur is a portion of the recording medium that is disposed at a position facing the discharge area of the discharge surface belonging to the upstream row in the second direction of the two rows adjacent in the second direction. Touch the applied part. The roller does not contact the above portion of the recording medium. Thereby, both stable conveyance and suppression of deterioration of recording quality can be realized more reliably.

  According to the present invention, it is possible to give a waist to the recording medium by giving the recording medium a wave shape along the first direction. Further, the concave portion and the convex portion of the wave shape are not formed in the portion arranged at the position facing the ejection area in the recording medium, and the deterioration of the recording quality can be suppressed. That is, according to the present invention, in a configuration including a plurality of liquid ejection heads, it is possible to suppress a decrease in recording quality while giving the recording medium stiffness.

1 is a schematic side view showing the inside of an ink jet printer according to a first embodiment of the present invention. It is a fragmentary sectional view of an inkjet head. (A) is a top view which shows a head unit, a waveform provision part, a waveform cancellation part, etc. FIG. (B) is sectional drawing along the IIIB-IIIB line | wire of (a). FIG. 6 is an explanatory diagram illustrating a state of a sheet viewed from a conveyance direction. FIG. 2 is a block diagram illustrating an electrical configuration of a printer. It is a figure corresponding to Drawing 3 (a) in a 2nd embodiment of the present invention. It is a figure corresponding to Drawing 3 (a) in a 3rd embodiment of the present invention.

  First, an overall configuration of the ink jet printer 1 according to the first embodiment of the present invention will be described mainly with reference to FIG.

  The printer 1 includes a rectangular parallelepiped casing 1a. A paper discharge unit 31 is provided on the top of the casing 1a. A head unit 10X, a platen unit 5, a paper feed unit 1c, a transport unit 20, a paper sensor 32, a controller 1p, and the like are accommodated in the internal space of the housing 1a. In the internal space of the housing 1a, a transport path for transporting the paper P is formed from the paper feed unit 1c toward the paper discharge unit 31 along the thick arrow shown in FIG. In FIG. 1, a wave shape imparting unit 50 and a wave shape canceling unit 60 which will be described later are not shown.

  The head unit 10X includes six inkjet heads 10 (see FIG. 3A). The printer 1 is of a line type that performs recording (image formation) with six heads 10 fixed. The specific configuration of the head unit 10X will be described in detail later.

  The platen unit 5 is disposed below the head unit 10X. The platen unit 5 faces the lower surface (ejection surface) 10a of each head 10 in the vertical direction. The specific configuration of the platen unit 5 will be described in detail later.

  The transport unit 20 is configured to transport the paper P in the transport direction so that the paper P faces the ejection surface 10a of each head 10, and the roller pairs 22, 23, 24, 25, 26, 27, and , Guides 29a, 29b, 29c, 29d, and 29e. The conveyance direction is a direction indicated by a thick arrow in FIG.

  The roller pairs 22 to 27 are arranged in this order from the upstream side in the transport direction so as to form a transport path. One of the roller pairs 22 to 27 is a drive roller, and is connected to the transport motor 20M (see FIG. 5). The drive roller is rotated by driving the carry motor 20M under the control of the controller 1p. Of the roller pairs 22 to 27, the other roller is a driven roller and rotates as the drive roller rotates.

  The guides 29a to 29e are arranged in this order from the upstream side in the transport direction so as to form a transport path. Each guide 29a-29e includes a pair of plates. The pair of plates are arranged to face each other while being separated from each other in a direction perpendicular to the surface of the plate.

  The paper feed unit 1c includes a paper feed tray 1c1 and a paper feed roller 1c2. Among these, the paper feed tray 1c1 is detachable from the housing 1a. The paper feed tray 1c1 is a box whose upper surface is open and can accommodate a plurality of papers P. The paper feed roller 1c2 is rotated by the drive of a paper feed motor 1cM (see FIG. 5) under the control of the controller 1p, and feeds the uppermost paper P in the paper feed tray 1c1.

  In addition to a CPU (Central Processing Unit) which is an arithmetic processing unit, the controller 1p includes a ROM (Read Only Memory), a RAM (Random Access Memory: including a nonvolatile RAM), an ASIC (Application Specific Integrated Circuit), an I / F ( Interface), I / O (Input / Output Port), timer, etc. The ROM stores programs executed by the CPU, various fixed data, and the like. The RAM temporarily stores data (for example, image data) necessary for executing the program. The ASIC performs rewriting and rearrangement of image data (for example, signal processing and image processing). The I / F performs data transmission / reception with an external device (for example, a PC connected to the printer 1). I / O inputs / outputs detection signals of various sensors. Note that the controller 1p may not include the ASIC, and image data may be rewritten or rearranged by a program executed by the CPU.

  The controller 1p, based on a recording command received from an external device, ejects ink in synchronization with the recording preparation operation, paper P supply / conveyance / discharge operation, and paper P conveyance so that an image is recorded on the paper P. Control operations, etc. The paper P is sent out from the paper supply unit 1c and is transported in the transport direction by the roller pairs 22 to 27 and the guides 29a to 29e. When the paper P passes directly under the head 10, ink is ejected from the ejection port 14a (see FIG. 2) under the control of the controller 1p, whereby an image is recorded on the surface. The ink ejection operation from the ejection port 14a is performed based on a paper leading edge detection signal output from the paper sensor 32. The paper P on which the image is recorded is discharged to the paper discharge unit 31 through the opening 30 formed in the upper part of the housing 1a.

  Next, the configuration of the head 10 will be described in detail mainly with reference to FIG. The six heads 10 constituting the head unit 10X have the same configuration.

  The head 10 includes a flow path unit 12, an actuator unit 17, a COF (Chip On Film) (not shown), a driver IC 18 (see FIG. 5), a circuit board (not shown), and the like.

  The flow path unit 12 is a laminated body in which four rectangular metal plates 12a, 12b, 12c, and 12d having substantially the same size are stacked, and a flow path is formed therein. The flow path includes one manifold flow path 13 and a plurality of individual flow paths 14. The individual flow path 14 is provided for each discharge port 14 a and branches from the manifold flow path 13. Each individual flow path 14 extends from the outlet of the manifold flow path 13 to the discharge port 14 a via the pressure chamber 16. The lower surface of the flow path unit 12 is a discharge surface 10a, and a plurality of discharge ports 14a are opened. A plurality of pressure chambers 16 are open on the upper surface of the flow path unit 12. The ink supplied from the cartridge (not shown) to the manifold channel 13 passes through the individual channel 14 and is ejected from the ejection port 14a.

  The actuator unit 17 includes a diaphragm 17a, a piezoelectric layer 17b, and a plurality of individual electrodes 17c. The vibration plate 17 a is fixed to the upper surface of the flow path unit 12 and closes the plurality of pressure chambers 16. The piezoelectric layer 17 b is fixed to the upper surface of the vibration plate 17 a and faces the plurality of pressure chambers 16. The plurality of individual electrodes 17 c are fixed to the upper surface of the piezoelectric layer 17 b and face each of the plurality of pressure chambers 16. The diaphragm 17a is a rectangular plate made of a conductor such as metal. The piezoelectric layer 17b is made of a piezoelectric material mainly composed of lead zirconate titanate (PZT) and is polarized in the thickness direction. The upper surface of the diaphragm 17a also serves as a common electrode by being disposed on the lower surface side of the piezoelectric layer 17b. The diaphragm 17a as a common electrode is connected to the ground wiring of the driver IC 18 and is always held at the ground potential.

  When a predetermined potential is applied to a certain individual electrode 17c from the driver IC 18, a potential difference is generated between the individual electrode 17c and the diaphragm 17a, and a portion of the piezoelectric layer 17b facing the individual electrode 17c in the thickness direction is formed. An electric field acts. Since the direction of the electric field is parallel to the polarization direction of the piezoelectric layer 17b, the portion of the piezoelectric layer 17b contracts in a plane direction perpendicular to the thickness direction. At this time, since the vibration plate 17a is fixed to the plate 12a, the portions of the vibration plate 17a and the piezoelectric layer 17b that face the pressure chamber 16 as the piezoelectric layer 17b contracts in the surface direction are the pressure chambers 16a. Deformation (unimorph deformation) to become convex toward As a result, the volume of the pressure chamber 16 is reduced, pressure (energy) is applied to the ink stored in the pressure chamber 16, and ink is ejected from the ejection port 14 a communicating with the pressure chamber 16.

  In this way, the portion sandwiched between each individual electrode 17 c and each pressure chamber 16 in the actuator unit 17 functions as an individual unimorph actuator for each pressure chamber 16. In other words, the actuator unit 17 includes a plurality of actuators provided corresponding to each of the plurality of pressure chambers 16. Each actuator can be deformed independently.

  The COF is a flat wiring board provided with a plurality of wirings. One end is fixed to the upper surface of the actuator unit 17 and the other end is connected to the circuit board. The COF has a driver IC 18 mounted between the one end and the other end. The plurality of wirings of the COF connect the output terminal of the driver IC 18 and the individual electrode 17c.

  The circuit board adjusts the signal input from the controller 1p, and outputs the adjusted signal to the driver IC 18 via the COF wiring. The driver IC 18 converts this signal into a drive signal and transmits the drive signal to each individual electrode 17c.

  3A and 3B, the head unit 10X and the components provided in the vicinity of the head unit 10X (the wave shape imparting portion 50, the wave shape canceling portion 60, the upper guide 70, the platen unit 5). Etc.) will be explained.

  In the present embodiment, the main scanning direction is the first direction, the conveyance direction of the paper P by the conveyance unit 20 below the head 10 (the direction parallel to the sub-scanning direction) is the second direction, the vertical direction is the third direction, and the vertical direction. The downward direction of the components corresponds to the fourth direction. The second direction is a direction orthogonal to the first direction and parallel to the ejection surface 10a. The third direction is a direction orthogonal to the ejection surface 10a. The fourth direction is the direction of ink ejection from the ejection port 14a.

  As shown in FIG. 3A, the six heads 10 constituting the head unit 10X are staggered in the main scanning direction while being separated from each other. The ejection surface 10a is arranged in two rows 10aR1 and 10aR2 along the main scanning direction. The ejection surfaces 10a belonging to different rows 10aR1 and 10aR2 are arranged at different positions with respect to the main scanning direction and the transport direction. Each discharge surface 10a includes a discharge region 10a1 in which a plurality of discharge ports 14a (see FIG. 2) are formed, and a non-discharge region in which the discharge ports 14a are not formed. In each ejection region 10a1, a plurality of ejection ports 14a are arranged at equal intervals in the main scanning direction. The non-ejection area is provided so as to cover the circumference of the ejection area 10a1.

  Between the two rows 10aR1 and 10aR2 adjacent in the transport direction, the wave shape imparting unit 50, the wave shape canceling unit 60, and the four upper guides 70 are arranged.

  The wave shape imparting section 50 is configured to impart a wave shape along at least the main scanning direction to the paper P on the upstream side in the transport direction of the row 10aR2. The wave shape imparting unit 50 includes three sets of first roller pairs 51 and three sets of second roller pairs 52.

  The three pairs of second rollers 52 are arranged along the main scanning direction and are arranged at the same position in the vertical direction. The three sets of the second roller pair 52 are arranged on the upstream side in the transport direction of the ejection region 10a1 on the three ejection surfaces 10a belonging to the row 10aR2.

  The three first roller pairs 51 are arranged along the main scanning direction and are arranged at the same position in the vertical direction. Of the three sets of first roller pairs 51, two sets convey the areas A1 and A2 between the discharge areas 10a1 on the two discharge faces 10a adjacent to each other in the main scanning direction among the three discharge faces 10a belonging to the row 10aR2. An upstream side in the transport direction of the region A3 on the right side of the discharge surface 10a shown on the rightmost side in FIG. 3A among the three discharge surfaces 10a belonging to the row 10aR2. On the side.

  The first roller pair 51 and the second roller pair 52 are arranged at different positions with respect to the main scanning direction and the transport direction. The first roller pair 51 is disposed upstream of the second roller pair 52 in the transport direction.

  The first roller pair 51 includes one upper roller 51a disposed on the upper side of the transport path and one lower roller 51b disposed on the lower side of the transport path. The shafts of the upper roller 51a and the lower roller 51b both extend in the main scanning direction. As shown in FIG. 3B, the upper roller 51a and the lower roller 51b face each other in the vertical direction and are in contact with each other, and sandwich the paper P at the first contact point 51x. In other words, the first roller pair 51 has the first contact point 51x configured to contact the paper P. Of the upper roller 51a and the lower roller 51b, the upper roller 51a is disposed on the upstream side in the ink discharge direction. The shaft of the upper roller 51a is disposed upstream of the shaft of the lower roller 51b in the transport direction. More specifically, the shaft center of the upper roller 51a is disposed upstream of the shaft center of the lower roller 51b in the transport direction. As a result, the paper P sandwiched between the upper roller 51a and the lower roller 51b is transported upstream in the ink ejection direction (that is, upward) toward the downstream side in the transport direction.

  Each of the second roller pairs 52 includes an upper roller set including five rollers arranged on the upper side of the conveyance path, and one lower roller 52b arranged on the lower side of the conveyance path. The lower roller 52b has a length greater than or equal to the length of the corresponding ejection region 10a1 in the main scanning direction. The upper roller set includes one roller 52a1 and four spurs 52a2. Both the shafts of one roller 52a1 and four spurs 52a2 and the shaft of the lower roller 52b included in the upper roller set extend in the main scanning direction. The roller 52a1 is a roller having no protrusion on the outer peripheral surface. The spur 52a2 is a roller having a plurality of protrusions on the outer peripheral surface. The spur 52a2 is arranged at a position overlapping with the ejection region 10a1 on the ejection surface 10a belonging to the row 10aR1 in the transport direction. The roller 52a1 is adjacent to the ejection area 10a1 on the ejection surface 10a belonging to the row 10aR1 with respect to the transport direction (as shown in FIG. 3A, adjacent to the main scanning direction among the three ejection surfaces 10a belonging to the row 10aR1. It is disposed on the downstream side in the transport direction of the regions B1 and B2 between the discharge regions 10a1 on the two discharge surfaces 10a. Each element (roller 52a1 and spur 52a2) of the upper roller set and the lower roller 52b face each other in the vertical direction and are in contact with each other as shown in FIG. 3B, and hold the paper P at the second contact point 52x. To do. In other words, the second roller pair 52 has a second contact point 52 x configured to contact the paper P. Among the elements of the upper roller set and the lower roller 52b, the elements of the upper roller set are arranged on the upstream side in the ink discharge direction. The axis of each element of the upper roller set is disposed downstream of the axis of the lower roller 52b in the transport direction. More specifically, the shaft centers of one roller 52a1 and four spurs 52a2 included in the upper roller set are arranged on the downstream side in the transport direction from the shaft center of the lower roller 52b. As a result, the paper P sandwiched between the elements of the upper roller set and the lower roller 52b is transported downstream in the ink ejection direction (ie, downward) as it travels downstream in the transport direction.

  The wave canceling unit 60 is configured to cancel the wave shape of the paper P on the downstream side of the row 10aR1 and on the upstream side of the wave shape imparting unit 50 in the transport direction. The wave canceling unit 60 includes three sets of third roller pairs 63.

  The three sets of third roller pairs 63 are arranged along the main scanning direction, and are arranged at the same position in the vertical direction. The three sets of third roller pairs 63 are arranged on the upstream side in the transport direction of the three sets of first roller pairs 51.

  Each of the third roller pairs 63 includes one upper roller 63a disposed on the upper side of the transport path and one lower roller 63b disposed on the lower side of the transport path. As shown in FIG. 3B, the upper roller 63a and the lower roller 63b are opposed to and in contact with each other in the vertical direction, and pinch the paper P at the third contact point 63x. In other words, the third roller pair 63 has a third contact point 63x configured to contact the paper P. The three third contact points 63x are arranged along the main scanning direction and are arranged at the same position in the vertical direction.

  With respect to the main scanning direction, the first contact point 51x and the third contact point 63x are at the same position, and the first contact point 51x, the third contact point 63x, and the second contact point 52x are at different positions.

  In each of the roller pairs 51, 52, 63, the lower rollers 51b, 52b, 63b are drive rollers and are connected to the transport motor 20M (see FIG. 5). The drive roller is rotated by driving the carry motor 20M under the control of the controller 1p. In each of the roller pairs 51, 52, and 63, the upper roller 51a, the roller 52a1, the spur 52a2, and the upper roller 63a are driven rollers and rotate with the rotation of the driving roller.

  The upper rollers 51a and 63a have a plurality of protrusions on the outer peripheral surface, similar to the spur 52a2.

  Of the four upper guides 70, three are arranged on the upstream side in the transport direction of each of the three sets of second roller pairs 52, and one of the three sets of first rollers 51 is shown in FIG. 3. The first roller pair 51 shown on the rightmost side in (a) is disposed at a position sandwiched between the other three upper guides 70. In other words, the upper guides 70 are disposed on both sides of each first roller pair 51 in the main scanning direction. The four upper guides 70 are arranged along the main scanning direction and are arranged at the same position in the vertical direction.

  As shown in FIG. 3B, the platen unit 5 includes a platen 5x that faces the ejection surface 10a belonging to the row 10aR1 in the vertical direction and a platen 5y that faces the ejection surface 10a belonging to the row 10aR2 in the vertical direction. . The upper surfaces of the platens 5x and 5y are uneven, and the first regions 5xa and 5ya and the second regions located below the first regions 5xa and 5ya by a distance D (that is, downstream in the ink ejection direction). Regions 5xb and 5yb are included. In the platen 5x, the first region 5xa is disposed at a portion facing the ejection surface 10a in the vertical direction, and the second region 5xb is disposed at portions corresponding to the regions B1 and B2. In the platen 5y, the second region 5yb is disposed at a portion facing the ejection surface 10a in the vertical direction, and the first region 5ya is disposed at a portion corresponding to the regions A1, A2, and A3. Vertical distance between the upper surface of each of the platens 5x and 5y and the discharge surface 10a (that is, the distance between the first region 5xa and the discharge surface 10a in the platen 5x; the interval between the second region 5yb and the discharge surface 10a in the platen 5y). G is equal to each other and is a predetermined value suitable for recording.

  Here, the positional relationship in the vertical direction among the elements of the areas 5xa, 5yb, the contact points 51x, 52x, 63x, and the upper guide 70 will be described. The first region 5xa and the third contact point 63x are at the same position (ie, the same height) with respect to the vertical direction. The first contact point 51x is above the third contact point 63x. The second contact point 52x is at the same position as the lower surface 70x of the downstream portion in the transport direction of the upper guide 70 with respect to the vertical direction, and is below the third contact point 63x. The second region 5yb is below the second contact point 52x. If the positional relationship in the vertical direction of each of the above elements is larger as the position is higher, ““ second region 5yb ”<“ lower surface 70x ”=“ second contact point 52x ”<“ first region 5xa ”=“ third contact ” The point 63x "<" the first contact point 51x "". Further, the separation distance in the vertical direction of the contact points 51x and 52x is equal to the distance D. Here, the first contact point 51x is from the second contact point 52x. Since the lower roller 51b is larger in diameter than the lower roller 52b, the lower rollers 51b and 52b have shafts lower than the lower roller 52b. They may be at the same position in the vertical direction.

  The sheet P is supported on the region 5xa of the platen 5x at a position facing the ejection surface 10a belonging to the row 10aR1, and is conveyed in a flat state in the main scanning direction. Thereafter, the sheet P is held between the third roller pair 63 at the third contact point 63x, and this portion is also flat in the main scanning direction. Thereafter, a wave shape along the main scanning direction is imparted to the paper P by the guide by the lower surface 70 x of the upper guide 70 and the nipping at the first contact point 51 x by the first roller pair 51. At this time, the sheet P is convex in the ink ejection direction at the portion guided by the lower surface 70x of the upper guide 70, and is concave in the ink ejection direction at the first contact point 51x. Further, as shown in FIG. 4, the portion of the paper P guided by the lower surface 70 x of the upper guide 70 is sandwiched by the second roller pair 52 at the second contact point 52 x. When the paper P is sandwiched by the second roller pair 52 at the second contact point 52x, the wave shape along the main scanning direction is more reliably formed on the paper P. In FIG. 4, the third roller pair 63 and the upper guide 70 are not shown. Then, the sheet P is conveyed to a position facing the ejection surface 10a belonging to the row 10aR2 while maintaining a state in which the wave shape along the main scanning direction is given. The paper P is supported on the respective regions 5ya and yb of the platen 5y at a position facing the ejection surface 10a belonging to the row 10aR2, and is conveyed in a state where a wave shape along the main scanning direction is given. At this time, the paper P is convex in the ink ejection direction in the region 5yb of the platen 5y, and concave in the ink ejection direction in the region 5ya.

  As described above, according to the present embodiment, it is possible to give the paper P a waist by giving the paper P a wave shape along the main scanning direction. In addition, the second roller pair 52 is arranged on the upstream side in the transport direction of the ejection region 10a1 in each of the plurality of ejection surfaces 10a belonging to the row 10aR2, and the main scanning is performed among the plurality of ejection surfaces 10a belonging to the row 10aR2. The first roller pair 51 is arranged on the upstream side in the transport direction of the regions A1 and A2 between the discharge regions 10a1 on the two discharge surfaces 10a adjacent to each other in the direction. As a result, the concave portion and the convex portion of the wave shape are not formed in the portion of the paper P that is disposed at the position facing the ejection region 10a1, and the deterioration of the recording quality can be suppressed. That is, according to the present embodiment, in a configuration including a plurality of heads 10, it is possible to suppress a decrease in recording quality while giving back to the paper P.

  In addition, according to the present embodiment, in the paper P, deformations (concave or convex) in the same direction are formed in portions of the plurality of ejection surfaces 10a belonging to the row 10aR2 that are disposed at positions facing the ejection regions 10a1. Is done. In this case, unlike the case where the concave portions are formed or the convex portions are formed in the respective portions, the interval between the paper P and the discharge surface 10a is substantially constant at the position facing the discharge regions 10a1. Therefore, the ejection control of the head 10 corresponding to the row 10aR2 can be performed relatively easily.

  The second roller pair 52 has a length greater than or equal to the length of the corresponding ejection region 10a1 in the main scanning direction. In this case, it is possible to prevent a waveform from being formed in a portion of the paper P that is disposed at a position facing the ejection area 10a1, and to more reliably suppress a decrease in recording quality. In other words, the portion of the paper P that is disposed at a position facing the ejection area 10a1 is substantially flat in the main scanning direction, so that deterioration in recording quality can be suppressed.

  The first contact point 51x and the second contact point 52x are arranged at different positions with respect to the transport direction. When the first contact point 51x and the second contact point 52x are arranged at the same position in the transport direction, the wave shape is abruptly applied to the paper P transported in the transport direction. On the other hand, in the case of the above configuration, a wave shape is gradually given to the paper P conveyed in the conveyance direction. That is, in the case of the above-described configuration, compared with the case where the first contact point 51x and the second contact point 52x are arranged at the same position in the transport direction, the wave on the paper P is suppressed while suppressing the load on the paper P. A shape can be imparted.

  The wave shape imparting unit 50 includes a first roller pair 51 that sandwiches the sheet P at the first contact point 51x and a second roller pair 52 that sandwiches the sheet P at the second contact point 52x. In this case, by sandwiching the paper P by the first roller pair 51 and the second roller pair 52, a wave shape along the main scanning direction can be given to the paper P with high accuracy. As a result, the waist of the paper P can be strengthened and the posture of the paper P can be further stabilized.

  The first roller pair 51 and the second roller pair 52 are arranged at different positions with respect to the main scanning direction. In this case, the first roller pair 51 and the second roller pair 52 can positively impart a wave shape along the main scanning direction to the paper P. Thereby, the waist of the paper P can be made stronger and the posture of the paper P can be further stabilized with a relatively simple configuration.

  Among the first roller pair 51 and the second roller pair 52, in the second roller pair 52 disposed on the downstream side in the conveying direction, the axis of each element (the roller 52a1 and the spur 52a2) of the upper roller set is the same as that of the lower roller 52b. It is arrange | positioned rather than the axis | shaft in the conveyance direction downstream. In this case, the paper P sandwiched between the second roller pair 52 is transported downstream in the transport direction and the ink discharge direction. As a result, at the position facing the discharge area 10a1 of the discharge surface 10a disposed on the downstream side in the transport direction of the second roller pair 52, the leading edge of the paper P is upstream in the ink discharge direction (that is, approaches the discharge surface 10a). (In the direction) is suppressed, and recording can be performed stably.

  The wave shape imparting unit 50 is disposed between two rows 10aR1 and 10aR2 adjacent in the transport direction. In this configuration, of the first roller pair 51 and the second roller pair 52, in the first roller pair 51 disposed on the upstream side in the transport direction, the axis of the upper roller 51a is more in the transport direction than the shaft of the lower roller 51b. Arranged upstream. In this case, the paper P sandwiched between the first roller pair 51 is transported upstream in the transport direction and the ink discharge direction. As a result, the rear end of the sheet P is located upstream in the ink ejection direction (that is, on the ejection surface 10a) at a position facing the ejection area 10a1 of the ejection surface 10a disposed on the upstream side in the transport direction of the first roller pair 51. Floating (in the approaching direction) is suppressed, and recording can be performed stably.

  The wave shape imparting unit 50 is disposed between two rows 10aR1 and 10aR2 adjacent in the transport direction. The paper P tends to become weak due to the landing of liquid. According to the above configuration, the liquid is landed at the position facing the discharge region 10a1 of the discharge surface 10a belonging to the row 10aR1 upstream in the transport direction among the two rows 10aR1 and 10aR2 adjacent in the transport direction, and the waist is weakened. The wave shape imparting unit 50 imparts a wave shape to the paper P to give the waist. Thereby, recording can be stably performed at a position facing the ejection region 10a1 of the ejection surface 10a belonging to the row 10aR2 on the downstream side in the transport direction among the two rows 10aR1 and 10aR2.

  The printer 1 is configured to cancel the wave shape of the paper P on the downstream side of the upstream row 10aR1 and the upstream side of the wave shape imparting unit 50 in the adjacent two rows 10aR1 and 10aR2 in the transport direction. The wave shape canceling unit 60 is included. In this case, with respect to the transport direction, the discharge surface belonging to the upstream row 10aR1 is provided by providing the corrugation canceling portion 60 between the discharge surface 10a belonging to the upstream row 10aR1 and the corrugation imparting portion 50. At the position facing the ejection area 10a1 of 10a, the influence of the waveform imparted by the waveform imparting section 50 can be suppressed, and recording can be performed stably.

  In the waveform canceling unit 60, the plurality of third contact points 63x are arranged along the main scanning direction and are arranged at the same position in the vertical direction. In this case, the influence of the corrugation imparted by the corrugation imparting section 50 can be more reliably suppressed at a position facing the ejection region 10a1 of the ejection surface 10a belonging to the upstream row 10aR1.

  The wave canceling unit 60 includes a third roller pair 63 that holds the paper P at a plurality of third contact points 63x. In this case, the wave shape of the paper P can be canceled with high accuracy by sandwiching the paper P by the third roller pair 63. As a result, the influence of the wave shape can be more reliably suppressed at the position facing the discharge region 10a1 of the discharge surface 10a belonging to the upstream row 10aR1.

  The second roller pair 52 includes a spur 52a2 having a plurality of protrusions on the outer peripheral surface and a roller 52a1 having no protrusion on the outer peripheral surface. The spur 52a2 has a smaller contact area with the paper P than the roller 52a1. The roller 52a1 has a larger contact area with the paper P and a larger force for holding the paper P than the spur 52a2. Therefore, according to the above configuration, the use of the spur 52a2 suppresses the deterioration of the recording quality due to the contact with the paper P. Further, by adopting the roller 52a1, stable conveyance can be realized.

  The spur 52a2 is arranged at a position overlapping with the ejection region 10a1 on the ejection surface 10a belonging to the row 10aR1 arranged on the upstream side in the carrying direction among the two rows 10aR1 and 10aR2 adjacent in the carrying direction with respect to the carrying direction. The roller 52a1 is disposed at a position that does not overlap with the ejection region 10a1 on the ejection surface 10a belonging to the row 10aR1 in the transport direction. In this case, the spur 52a2 is a portion of the paper P that is disposed at a position facing the discharge region 10a1 of the discharge surface 10a belonging to the row 10aR1, and is in contact with the portion where recording has been performed. The roller 52a1 does not contact the portion of the paper P. Thereby, both stable conveyance and suppression of deterioration of recording quality can be realized more reliably.

  Next, an ink jet printer according to a second embodiment of the present invention will be described with reference to FIG.

  The printer according to the second embodiment has the same configuration as the printer 1 according to the first embodiment except for the configurations of the head unit 10X and the platen unit 5.

  In the second embodiment, the head unit 10 </ b> X includes 12 heads 10. The ejection surface 10a is arranged in four rows 10aR1x, 10aR1, 10aR2, and 10aR2x along the main scanning direction. That is, in the second embodiment, the row 10aR1x is added on the upstream side in the transport direction of the row 10aR1 in the first embodiment, and the row 10aR2x is added on the downstream side in the transport direction of the row 10aR2 in the first embodiment. The three ejection surfaces 10a belonging to the row 10aR1x are arranged at the same position as the three ejection surfaces 10a belonging to the row 10aR1 in the main scanning direction. The three ejection surfaces 10a belonging to the row 10aR2x are arranged at the same position as the three ejection surfaces 10a belonging to the row 10aR2 in the main scanning direction.

  In the second embodiment, the platen unit 5 includes, in addition to the platens 5x and 5y of the first embodiment, two platens that face the discharge surfaces 10a belonging to the rows 10aR1x and 10aR2x in the vertical direction. The platen that faces the ejection surface 10a belonging to the row 10aR1x in the vertical direction has the same configuration as the platen 5x. The platen that faces the ejection surface 10a belonging to the row 10aR2x in the vertical direction has the same configuration as the platen 5y.

  The sheet P is transported at a position facing the ejection surface 10a belonging to the row 10aR1x in a flat state in the main scanning direction, like the position facing the ejection surface 10a belonging to the row 10aR1. Thereafter, as described in the first embodiment, the sheet P passes through a position facing the ejection surface 10a belonging to the row 10aR1 in a flat state in the main scanning direction. Then, as described in the first embodiment, the paper P has a wave shape along the main scanning direction by the guide by the lower surface 70x of the upper guide 70 and the nipping at the first contact point 51x by the first roller pair 51. Is granted. Further, the portion of the paper P that is guided by the lower surface 70 x of the upper guide 70 is sandwiched by the second roller pair 52 at the second contact point 52 x. When the paper P is sandwiched by the second roller pair 52 at the second contact point 52x, the wave shape along the main scanning direction is more reliably formed on the paper P. Then, the sheet P is conveyed to a position facing the ejection surface 10a belonging to the row 10aR2 while maintaining a state in which the wave shape along the main scanning direction is given. As described in the first embodiment, the sheet P is transported at a position facing the ejection surface 10a belonging to the row 10aR2 with a wave shape along the main scanning direction. Further, the paper P is transported in a state where a wave shape along the main scanning direction is applied even at a position facing the ejection surface 10a belonging to the row 10aR2x.

  Next, an ink jet printer according to a third embodiment of the present invention will be described with reference to FIG.

  The printer according to the third embodiment has the same configuration as the printer 1 according to the first embodiment, except for the configuration of the head unit 10X, the platen unit 5, the wave shape imparting unit 50, the wave shape canceling unit 60, and the upper guide 70. It is.

  In the third embodiment, the head unit 10 </ b> X includes 12 heads 10. The ejection surface 10a is arranged in four rows 10aR1, 10aR2, 10aR3, and 10aR4 along the main scanning direction. The columns 10aR3 and 10aR4 have the same configuration as the columns 10aR1 and 10aR2, respectively. That is, in the third embodiment, two sets of the rows 10aR1 and 10aR2 of the first embodiment are provided along the transport direction. The ejection surfaces 10a belonging to different rows 10aR3 and 10aR4 are arranged at different positions with respect to the main scanning direction and the transport direction. The three ejection surfaces 10a belonging to the row 10aR3 are arranged at the same position as the three ejection surfaces 10a belonging to the row 10aR1 in the main scanning direction. The three ejection surfaces 10a belonging to the row 10aR4 are arranged at the same position as the three ejection surfaces 10a belonging to the row 10aR2 in the main scanning direction.

  In the third embodiment, the platen unit 5 includes, in addition to the platens 5x and 5y of the first embodiment, two platens that face the ejection surfaces 10a belonging to the rows 10aR3 and 10aR4 in the vertical direction. The platen that faces the ejection surface 10a belonging to the row 10aR3 in the vertical direction has the same configuration as the platen 5x. The platen that faces the ejection surface 10a belonging to the row 10aR4 in the vertical direction has the same configuration as the platen 5y.

  Between the rows 10aR2 and 10aR3 and between the rows 10aR3 and 10aR4, as in the rows 10aR1 and 10aR2, the wave shape imparting portion 50, the wave shape canceling portion 60, and the upper guide 70 are disposed.

  As described in the first embodiment, the paper P sequentially passes through the positions facing the ejection surfaces 10a belonging to the rows 10aR1 and 10aR2. Thereafter, the sheet P sequentially passes through positions facing the ejection surfaces 10a belonging to the rows 10aR3 and 10aR4 while maintaining a state in which the wave shape along the main scanning direction is applied. In the present embodiment, the paper P has a wave along the main scanning direction at a position facing each of the ejection surface 10a belonging to the row 10aR2, the ejection surface 10a belonging to the row 10aR3, and the ejection surface 10a belonging to the row 10aR4. It is conveyed while maintaining the state to which the shape is given. Since the portion of the paper P that is disposed at a position facing each ejection region 10a1 is substantially flat in the main scanning direction, it is possible to suppress a decrease in recording quality.

  According to the second and third embodiments, since the number of heads 10 is larger than that in the first embodiment, the ink dot density can be increased.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various design changes can be made as long as they are described in the claims.

About the wave shape imparting part:
-A wave shape provision part is not limited to a roller pair, A plate-shaped guide etc. may be included.
The wave shape imparting unit may be disposed not only between two rows adjacent in the second direction but also in the second direction upstream side of the row that is most upstream with respect to the second direction. For example, in the first embodiment, the wave shape imparting unit 50 may be further provided on the upstream side in the transport direction of the row 10aR1. In the second embodiment, a wave shape imparting unit 50 may be further provided on the upstream side in the transport direction of the row 10aR1x. In 3rd Embodiment, you may further provide the waveform assignment | providing part 50 in the conveyance direction upstream of row | line | column 10aR1.
In the second embodiment, the wave shape imparting unit 50 may be further provided between the rows 10aR1x and 10aR1 and / or between the rows 10aR2 and 10aR2x.
One of the first contact portion and the second contact portion may have a length that is less than the length of the corresponding discharge region in the first direction.
One of the first contact portion and the second contact portion may not include a spur having a plurality of protrusions on the outer peripheral surface and a roller having no protrusion on the outer peripheral surface. For example, the one side may include only a roller or may include only a spur.
-A 1st contact point and a 2nd contact point may be arrange | positioned in the mutually same position regarding the 2nd direction. For example, the following configuration may be adopted. In this configuration, the first roller pair 51 and the second roller pair 52 are disposed at the same position in the second direction. The lower roller 51b and the lower roller 52b are rotatably supported on a common shaft extending in the first direction, and the diameter of the lower roller 51b is larger than the diameter of the lower roller 52b. An upper roller 51a is disposed above the lower roller 51b so as to sandwich the sheet P at the first contact point 51x, and an upper roller is disposed above the lower roller 52b so as to sandwich the sheet P at the second contact point 52x. A set is placed. In the above configuration, the lower roller 52b may be omitted. When the lower roller 52b is omitted in the above configuration, the contact point between the upper roller set and the paper P becomes the second contact point 52x.
The first roller pair and the second roller pair may be arranged at the same position with respect to the first direction.
-The axis | shaft of the two rollers which oppose the 3rd direction which comprises a 1st roller pair may be arrange | positioned in the mutually same position regarding the 2nd direction.
-The axis | shaft of the two rollers which oppose the 3rd direction which comprises a 2nd roller pair may be arrange | positioned in the mutually same position regarding the 2nd direction.

About wave shape cancellation part:
-A wave shape cancellation part is not limited to a roller pair, A plate-shaped guide etc. may be included.
-You may abbreviate | omit a wave shape cancellation part.
-In above-mentioned embodiment, although the 3rd roller pair 63 which comprises the waveform cancellation part 60 is arrange | positioned only in the same position as the 1st roller pair 51 regarding 1st direction, it is 2nd regarding 1st direction. It may be arranged at the same position as the roller pair 52. That is, the third roller pair 63 may be disposed at the same position as both the first roller pair 51 and the second roller pair 52 in the first direction.

Other:
The upper guide 70 may be omitted.
-The energy applying unit that discharges the liquid from the discharge port is not limited to a piezo method using a piezoelectric element, but other methods (for example, a thermal method using a heating element, an electrostatic method using an electrostatic force, etc.) ).
The number of liquid discharge heads included in the liquid discharge apparatus may be an arbitrary number as long as it is plural. The plurality of liquid ejection heads is not limited to being arranged in a staggered manner.
The liquid discharged from the discharge port of the liquid discharge head may be an arbitrary liquid (for example, a pretreatment liquid). Further, the types of liquid ejected from the ejection ports may be different among a plurality of heads, and a plurality of types of liquids may be ejected from the ejection ports of one head.
The recording medium is not limited to the paper P, and may be any recordable medium.
The liquid ejection device is not limited to a printer, and may be a facsimile, a copier, or the like.

1 Inkjet printer (liquid ejection device)
10 Inkjet head (liquid discharge head)
DESCRIPTION OF SYMBOLS 10a Discharge surface 10a1 Discharge area | region 10aR1, 10aR2 row | line | column 10X Head unit 14a Discharge port 20 Conveyance part 50 Waveform provision part 51 1st roller pair (1st contact part)
51x 1st contact point 52 2nd roller pair (2nd contact part)
52a1 roller 52a2 spur 52x second contact point 60 wave shape cancellation part 63 third roller pair 63x third contact point

Claims (14)

A plurality of liquid ejection heads each having an ejection surface including an ejection region in which a plurality of ejection ports for ejecting liquid are formed, wherein the ejection surfaces are arranged in a plurality of rows along a first direction. A plurality of liquid ejection heads, wherein the ejection surfaces belonging to different rows are arranged at different positions with respect to the first direction and a second direction perpendicular to the first direction and parallel to the ejection surface; ,
A transport unit configured to transport the recording medium in the second direction so that the recording medium faces each of the plurality of ejection surfaces;
A wave shape imparting section configured to impart a wave shape along at least the first direction to the recording medium on the upstream side in the second direction of at least one of the plurality of rows; With
The wave shape imparting section is
A first contact portion having a first contact point configured to contact the recording medium;
A second contact portion configured to contact a recording medium and having a second contact point disposed at a position different from the first contact point in the first direction and a third direction orthogonal to the ejection surface. Including
One of the first contact portion and the second contact portion is arranged on the upstream side in the second direction of each of the discharge regions on the plurality of discharge surfaces belonging to the one row,
Of the plurality of discharge surfaces belonging to the one row, on the upstream side in the second direction of the region between the discharge regions of two discharge surfaces adjacent in the first direction, the first contact portion and the first A liquid ejection apparatus, wherein the other of the two contact portions is arranged.   2. The liquid ejection apparatus according to claim 1, wherein the one has a length greater than or equal to a length of the corresponding ejection region with respect to the first direction.   The liquid ejecting apparatus according to claim 1, wherein the first contact point and the second contact point are arranged at different positions with respect to the second direction. The first contact portion includes a first roller pair that sandwiches the recording medium at the first contact point,
The liquid ejecting apparatus according to claim 1, wherein the second contact portion includes a second roller pair that sandwiches a recording medium at the second contact point.   The liquid ejecting apparatus according to claim 4, wherein the first roller pair and the second roller pair are arranged at different positions with respect to the first direction.   6. The liquid ejection apparatus according to claim 4, wherein the first roller pair is disposed upstream of the second roller pair in the second direction.   Of the two rollers facing the third direction constituting the second roller pair, the shaft of one roller disposed on the upstream side in the fourth direction, which is the liquid discharge direction from the plurality of discharge ports, The liquid ejecting apparatus according to claim 6, wherein the liquid ejecting apparatus is disposed on the downstream side in the second direction with respect to the shaft of the other roller. The wave shape imparting section is disposed between at least two rows adjacent in the second direction,
Of the two rollers facing the third direction constituting the first roller pair, the shaft of one roller arranged on the upstream side in the fourth direction, which is the liquid discharge direction from the plurality of discharge ports, The liquid ejecting apparatus according to claim 4 , wherein the liquid ejecting apparatus is disposed upstream of the other roller shaft in the second direction.   The liquid ejecting apparatus according to claim 1, wherein the wave shape imparting unit is disposed between at least two rows adjacent in the second direction.   A wave shape configured to cancel the wave shape of the recording medium on the downstream side of the upstream row of the two adjacent rows and on the upstream side of the wave shape imparting unit with respect to the second direction. The liquid ejecting apparatus according to claim 9, further comprising a canceling unit. The wave canceling unit has a plurality of third contact points configured to come into contact with the recording medium,
The liquid ejecting apparatus according to claim 10, wherein the plurality of third contact points are arranged along the first direction and are arranged at the same position with respect to the third direction.   The liquid ejecting apparatus according to claim 11, wherein the wave canceling unit includes a third roller pair that sandwiches a recording medium at the plurality of third contact points.   The liquid ejecting apparatus according to any one of claims 9 to 12, wherein the one includes a spur having a plurality of protrusions on an outer peripheral surface and a roller having no protrusion on the outer peripheral surface. . The spur is arranged at a position overlapping with the ejection region on the ejection surface belonging to the row arranged upstream in the second direction of the two adjacent rows with respect to the second direction,
The roller is arranged at a position that does not overlap with the ejection region on the ejection surface belonging to the row arranged upstream in the second direction of the two adjacent rows with respect to the second direction. The liquid ejection device according to claim 13.

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