Liquid discharge device

Abstract

To reduce the risk of discharge problems occurring even when the fluctuation width of the print duty is large.SOLUTION: A liquid ejection device 1 according to the present invention includes a printing unit 6 that ejects liquid onto a the medium M to print, a transport unit 3 that transports the medium M in a transport direction T, a pair of discharge rollers 4 that discharges the medium M in a discharge direction E, a stiffness imparting member 5 that advances toward the medium M being discharged from the pair of discharge rollers 4 to curve the medium M in the width direction W to impart stiffness to the medium M, and a control unit 7 that determines the amount of advance of stiffness imparting member 5 based on the printing duty.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a liquid ejection device. [Background technology]

[0002] Various liquid ejection devices have been used in the past. Among them, there is a liquid ejection device that includes a pair of ejection rollers that eject a medium, and a stiffening member that advances toward the medium ejected from the pair of ejection rollers to curve and stiffen the medium. For example, Patent Document 1 discloses an image forming device that includes a discharge roller that constitutes the pair of ejection rollers, and a stiffening roller that has the function of bending and deforming the medium into a corrugated shape to stiffen it. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-212925 A Summary of the Invention [Problem to be solved by the invention]

[0004] In a liquid ejection device, the stiffness of a medium changes significantly depending on the print duty of the medium to be printed, so the optimal stiffening conditions differ depending on the print duty. As a result, if the medium is discharged under constant stiffening conditions, the print duty may fluctuate widely depending on the data to be printed, and the optimal stiffening conditions may not be achieved. For this reason, in a conventional liquid ejection device equipped with a discharge roller pair and a stiffening member as shown in Patent Document 1, there is a risk of discharge problems such as a decrease in the alignment of media stacked on the discharge tray. [Means for solving the problem]

[0005] The liquid ejection device of the present invention, which solves the above-mentioned problems, is characterized by comprising a printing unit that ejects liquid onto a medium to print, a transport unit that transports the medium printed by the printing unit in a transport direction, a pair of discharge rollers that eject the medium transported by the transport unit in a discharge direction that is along the transport direction when viewed from the surface direction of the medium, a stiffness enhancing member that advances toward the medium being discharged from the pair of discharge rollers, thereby curving the medium in a width direction that intersects with the transport direction to add stiffness to the medium, and a control unit that determines the amount of advancement of the stiffness enhancing member based on a printing duty corresponding to the amount of the liquid ejected onto the medium.

[0006] Furthermore, another liquid ejection device of the present invention that solves the above-mentioned problems includes a printing unit that ejects liquid onto a medium to print, a transport unit that transports the medium printed by the printing unit in a transport direction, a pair of ejection rollers that eject the medium transported by the transport unit in a discharge direction that is along the transport direction when viewed from the surface direction of the medium, and a control unit capable of controlling the pair of ejection rollers, wherein the pair of ejection rollers is capable of changing the ejection angle of the medium when viewed from a width direction that intersects with the transport direction as the ejection direction, and the control unit changes the ejection angle of the pair of ejection rollers based on a printing duty corresponding to the amount of liquid ejected onto the medium. [Brief description of the drawings]

[0007] [Figure 1] 1 is a schematic cross-sectional view of a liquid ejection device according to an embodiment of the present invention. [Diagram 2] 4 is a schematic cross-sectional view illustrating the vicinity of the discharge port of the liquid ejection device in FIG. 1, illustrating a state in which the amount of advancement of the stiffness enhancing member is small. FIG. [Diagram 3] 4 is a schematic cross-sectional view illustrating the vicinity of the discharge port of the liquid ejection device in FIG. 1, illustrating a state in which the amount of advancement of the stiffness enhancing member is large. FIG. [Figure 4] 2 is a schematic cross-sectional view illustrating the periphery of the discharge port of the liquid discharge device in FIG. 1, illustrating a state in which the discharge angle is small. FIG. [Diagram 5]2 is a schematic cross-sectional view illustrating the periphery of the discharge port of the liquid discharge device in FIG. 1, illustrating a state in which the discharge angle is large. FIG. [Figure 6] 6A and 6B are diagrams for explaining examples of division when dividing print data in accordance with the area of ​​a medium. [Figure 7] 4 is a flowchart showing an example of a printing method using the liquid ejection device of FIG. [Figure 8] Schematic diagram showing a curved state of a medium. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The present invention will first be briefly described below. In order to solve the above problem, a liquid ejection device according to a first aspect of the present invention is characterized in that it comprises a printing unit that ejects liquid onto a medium to print, a transport unit that transports the medium printed by the printing unit in a transport direction, a pair of discharge rollers that discharge the medium transported by the transport unit in a discharge direction that is along the transport direction when viewed from the surface direction of the medium, a stiffness enhancing member that advances toward the medium being discharged from the pair of discharge rollers, thereby curving the medium in a width direction that intersects with the transport direction to add stiffness to the medium, and a control unit that determines the amount of advancement of the stiffness enhancing member based on a printing duty corresponding to the amount of the liquid ejected onto the medium.

[0009] According to this aspect, a stiffening member capable of stiffening the medium is provided, and the amount of advancement of the stiffening member is determined based on the print duty. Therefore, even if the print duty fluctuates widely, the medium can be stiffened appropriately based on the print duty, and the risk of discharge problems such as a decrease in the alignment of the medium in the discharge tray or ink transfer caused by the leading edge of the discharged medium rubbing against the printed image of the medium placed on the discharge tray can be reduced.

[0010] A liquid ejection device according to a second aspect of the present invention is an aspect dependent on the first aspect, and is characterized in that the control unit determines the amount of advancement based on at least one of environmental information in which the liquid ejection device is installed and the type of medium, in addition to the printing duty.

[0011] According to this aspect, the advance amount is determined based on at least one of the environmental information of the liquid ejection device and the type of medium in addition to the printing duty. The optimal stiffening conditions may differ depending on the environmental information of the liquid ejection device and the type of medium, but even in such cases, the advance amount can be appropriately set to give the medium suitable stiffness and reduce the risk of discharge problems.

[0012] A liquid ejection device according to a third aspect of the present invention is an aspect dependent on the second aspect, and is characterized in that when the size of the medium as a type of medium is a second size smaller than a first size, the control unit makes the amount of advance smaller than in the case of the first size.

[0013] According to this aspect, when the size of the medium is small, the amount of advance is reduced. When the size of the medium is small, there is little risk of discharge problems occurring, and there is no need to stiffen excessively. Therefore, when there is little risk of discharge problems occurring and there is no need to stiffen excessively, it is possible to suppress problems that may occur due to the stiffening member coming into strong contact with the medium, such as the stiffening member coming into strong contact with ink that is not yet sufficiently dried.

[0014] A liquid ejection device according to a fourth aspect of the present invention is an aspect dependent on any one of the first to third aspects, characterized in that the control unit determines the amount of advancement based on, in addition to the printing duty, the printing duty of the previous medium that was ejected previously from the ejection roller pair among the media.

[0015] According to this embodiment, the advance amount is determined based on the printing duty of the previous medium in addition to the printing duty. With this configuration, for example, in cases where a large amount of ink is applied to the print image printed on the previous medium and some of the ink is not sufficiently dried, it is possible to adjust the contact conditions with the previous medium when the medium is discharged, and to suppress problems associated with the contact conditions with the previous medium.

[0016] A liquid ejection device according to a fifth aspect of the present invention is an aspect dependent on any one of the first to fourth aspects, characterized in that the pair of ejection rollers is capable of changing the ejection angle of the medium as viewed from the width direction, which is the ejection direction, and the control unit changes the ejection angle based on the printing duty.

[0017] According to this embodiment, the discharge roller pair changes the discharge angle based on the print duty. For example, in cases where a large amount of ink is applied to the print image printed on the previous medium and the ink is insufficiently dried, it is possible to reduce the risk of discharge problems by changing the discharge angle based on the print duty. Therefore, even if the fluctuation range of the print duty is large, the medium can be discharged at a suitable discharge angle based on the print duty, and the risk of discharge problems can be reduced.

[0018] A liquid ejection device according to a sixth aspect of the present invention is an aspect dependent on any one of the first to fifth aspects, characterized in that the stiffening member has a contact portion that contacts the medium and a cam mechanism connected to the contact portion, and the amount of advancement of the contact portion is changed by displacing the cam mechanism.

[0019] According to this aspect, the stiffness enhancing member has a contact portion and a cam mechanism, and the amount of advancement of the contact portion is changed by displacing the cam mechanism. By adopting such a configuration, the stiffness enhancing member can be configured simply and preferably.

[0020] A liquid ejection device according to a seventh aspect of the present invention comprises a printing unit that ejects liquid onto a medium to print, a transport unit that transports the medium printed by the printing unit in a transport direction, a pair of ejection rollers that eject the medium transported by the transport unit in a discharge direction that is along the transport direction when viewed from the surface direction of the medium, and a control unit capable of controlling the pair of ejection rollers, wherein the pair of ejection rollers are capable of changing the ejection angle of the medium when viewed from a width direction that intersects with the transport direction as the ejection direction, and the control unit changes the ejection angle of the pair of ejection rollers based on a printing duty corresponding to the amount of liquid ejected onto the medium.

[0021] According to this aspect, the discharge roller pair changes the discharge angle based on the print duty. By changing the discharge angle based on the print duty, it is possible to reduce the risk of discharge problems occurring, so even if the print duty fluctuates greatly, the medium can be discharged at a suitable discharge angle based on the print duty regardless of stiffness, thereby reducing the risk of discharge problems occurring.

[0022] A liquid ejection device 1 according to an embodiment of the present invention will be specifically described below with reference to Figures 1 to 8. The liquid ejection device 1 according to this embodiment is an inkjet printer that forms an image by ejecting ink, which is an example of a liquid, onto a transported medium M. First, an overview of the liquid ejection device 1 will be described with reference to Figure 1.

[0023] 1, the liquid ejection device 1 of this embodiment includes a setting unit 9 that can set a plurality of sheets of media M to be printed on in a stacked manner. The liquid ejection device 1 of this embodiment includes a pick roller 2 and a plurality of transport roller pairs 3 that serve as a transport unit. When printing starts, the topmost sheet of media M set in the setting unit 9 is picked up by the pick roller 2 and transported in the transport direction T by the transport roller pair 3.

[0024] A head 6 capable of ejecting ink onto the medium M is provided along the transport path of the medium M. In the liquid ejection device 1 of this embodiment, an ejection outlet 10 and an ejection tray 8 are provided downstream of the head 6 in the transport direction T. The medium M on which an image is formed by ejecting ink from the head 6 is ejected from the ejection outlet 10 and stacked in the ejection tray 8. Near the ejection outlet 10, there are provided a pair of ejection rollers 4 and a stiffening member 5 that bends the medium M ejected from the pair of ejection rollers 4 in a width direction W intersecting with the transport direction T to add stiffness, both of which will be described in detail later.

[0025] As described above, the liquid ejection device 1 of this embodiment includes the head 6 as a printing unit that ejects ink onto the medium M to print, the transport roller pair 3 as a transport unit that transports the medium M printed by the head 6 in the transport direction T, the discharge roller pair 4, and the stiffening member 5. Furthermore, the liquid ejection device 1 of this embodiment includes a control unit 7 having a CPU, a memory unit, and the like. The control unit 7 controls the driving of each of the components of the liquid ejection device 1 of this embodiment, such as the pick roller 2, the transport roller pair 3, the head 6, the discharge roller pair 4, and the stiffening member 5.

[0026] 1, the liquid ejection device 1 of this embodiment is capable of printing on both sides of the medium M, and is equipped with a document reading unit that reads the document, although this is not shown in the figure because it is simplified. However, the present invention is not limited to such a configuration.

[0027] Next, the discharge roller pair 4 and stiffening member 5, which are essential parts of the liquid discharge device 1 of this embodiment, will be described with reference to Figures 2 to 5. In the liquid discharge device 1 of this embodiment, the discharge roller pair 4 is provided near the center in the width direction W, and stiffening members 5 are provided on both sides of the discharge roller pair 4 in the width direction W. The discharge roller pair 4 discharges the medium M transported by the transport roller pair 3 in a discharge direction E along the transport direction T when viewed from the surface direction of the medium M. The stiffening member 5 is configured to advance from above to below toward the medium M discharged from the discharge roller pair 4, thereby bending the medium M in the width direction W to stiffen the medium M.

[0028] 2 and 3, the stiffness enhancing member 5 of this embodiment has a contact portion 51 having a jagged roller 51a, a cam mechanism 53, and a spring 55, which is an example of an elastic member, connected to the contact portion 51 and the cam mechanism 53. The stiffness enhancing member 5 is configured so that the jagged roller 51a contacts the medium M. For this reason, the contact area of ​​the stiffness enhancing member 5 with the medium M is small, and the stiffness enhancing member 5 contacts the medium M over a wide area, thereby preventing the stiffness enhancing member from contacting ink that is not sufficiently dried. However, the stiffness enhancing member 5 is not limited to this configuration, and for example, the jagged roller 51a may not be provided, and the lower surface of the contact portion 51 may contact the medium M.

[0029] 2 and 3, cam mechanism 53 is configured to be rotatable around rotation axis 54. When cam mechanism 53 is rotated in rotation direction R1 from the state in FIG. 2 to the state in FIG. 3, spring 55 is pressed toward contact portion 51. As shown in FIG. 2 and 3, contact portion 51 is configured to be rotatable around rotation axis 52. When contact portion 51 is pressed downward by spring 55 from the state in FIG. 2, and thus contact portion 51 rotates in rotation direction R2 to the state in FIG. 3, medium M is pressed by jagged roller 51a and pressed further downward.

[0030] Here, in FIG. 2 and FIG. 3, the medium M is shown in cross section at the position where it contacts the notched roller 51a. As is clear from a comparison of FIG. 2 and FIG. 3, in the state of FIG. 3, the medium M is pushed further downward at the position where it contacts the notched roller 51a compared to the state of FIG. 2, and therefore, it can be seen that the medium M is in a state where it is curved more when viewed from the discharge direction E. In this way, the stiffening member 5 of this embodiment is configured to be able to change the curved state of the medium M discharged from the discharge roller pair 4. Note that FIG. 8 is a schematic diagram showing the curved state of the medium M when viewed from the discharge direction E, and the notched roller 51a and the medium M represented by the dashed line correspond to the state of FIG. 2, and the notched roller 51a and the medium M represented by the solid line correspond to the state of FIG. 3. As shown in FIG. 8, in the state of FIG. 3, the medium M is pushed further downward at the position where it contacts the notched roller 51a compared to the state of FIG. 2, and therefore, it can be seen that the medium M is in a state where it is curved more when viewed from the discharge direction E.

[0031] 4 and 5, the discharge roller pair 4 of this embodiment includes a drive roller 4A that is driven to rotate by a motor (not shown), and a driven roller 4B that rotates in response to the rotation of the drive roller 4A at a position opposite the drive roller 4A. The discharge roller pair 4 of this embodiment is configured to be able to discharge the medium M in the discharge direction E from the discharge port 10 by nipping the medium M between the drive roller 4A and the driven roller 4B and driving the drive roller 4A to rotate.

[0032] 4 and 5, the discharge roller pair 4 of this embodiment is configured so that the drive roller 4A can be moved from the position shown in FIG. 4 to the direction D and placed at the position shown in FIG. 5. By moving the drive roller 4A from the position shown in FIG. 4 to the position shown in FIG. 5, the nip position of the medium M between the drive roller 4A and the driven roller 4B moves, and the discharge direction E can be changed from the discharge direction E1 shown in FIG. 4 to the discharge direction E2 shown in FIG. 5. By moving the drive roller 4A to change the discharge direction E from the discharge direction E1 shown in FIG. 4 to the discharge direction E2 shown in FIG. 5, the contact angle of the leading end of the medium M discharged from the discharge port 10 with respect to the medium M stacked on the discharge tray 8 can be reduced.

[0033] In the liquid ejection device 1 of this embodiment, the control unit 7 can determine how far the stiffness imparting member 5 should advance toward the medium M as shown in the state of FIG. 2 and the state of FIG. 3 based on the printing duty corresponding to the amount of ink ejected onto the medium M. In other words, the control unit 7 can determine how far the stiffness imparting member 5 should advance based on the printing duty corresponding to the amount of ink ejected onto the medium M. In this way, by determining the advancement amount of the stiffness imparting member 5 based on the printing duty, even if the fluctuation range of the printing duty is large, it is possible to impart suitable stiffness to the medium M based on the printing duty. By imparting suitable stiffness to the medium M, it is possible to reduce the risk of discharge problems such as a decrease in the alignment of the medium M when multiple sheets of the medium M are stacked on the discharge tray 8, or the transfer of ink due to the tip of the medium M discharged from the discharge port 10 rubbing the printed image of the medium M placed on the discharge tray 8. In other words, the printing duty here is a value indicating the weight of ink applied to a specified area on the printing surface of the medium M.

[0034] 4 and 5, in the liquid ejection device 1 of this embodiment, the ejection roller pair 4 can change the ejection angle of the medium M as viewed from the width direction W as the ejection direction E, and the control unit 7 can change the ejection angle of the ejection roller pair 4 based on the printing duty. In this way, by changing the ejection angle based on the printing duty, it is possible to reduce the risk of ejection problems occurring. Therefore, even when the fluctuation width of the printing duty is large, the liquid ejection device 1 of this embodiment can eject the medium M at a suitable ejection angle based on the printing duty regardless of stiffness, and can reduce the risk of ejection problems occurring.

[0035] In the liquid ejection device 1 of this embodiment, the print duty corresponding to the amount of ink ejected onto the medium M can be determined for one sheet of medium M as a whole, and it is also possible to divide one sheet of medium M into a plurality of regions and determine the print duty for each of these regions. Furthermore, it is also possible to determine the print duty for both sides of the medium M when printing on both sides of the medium M, and for both sides as a whole. FIG. 6 shows an example of a state in which one sheet of medium M is divided into a plurality of regions, region S1, region S2, region S3, region S4, region S5, and region S6. The control unit 7 determines the print duty for each of the regions S1, S2, S3, S4, S5, and S6, for example, based on the print data for each of the regions S1, S2, S3, S4, S5, and S6.

[0036] Next, an example of a printing method using the liquid ejection device 1 of this embodiment will be described with reference to the flowchart of Fig. 7. When the printing method of this embodiment is started, first, in step S110, print data is sent to the liquid ejection device 1 via a computer (not shown) or the like. Next, in step S120, the print data input to the liquid ejection device 1 in step S110 is divided into, for example, areas S1, S2, S3, S4, S5, and S6, and the ink amounts are calculated for each of areas S1, S2, S3, S4, S5, and S6.

[0037] Next, in step S130, print data is obtained for the medium M (the previous medium) on which printing was performed immediately before the medium M on which printing is to be performed. The liquid ejection device 1 of this embodiment is provided with a memory unit in the control unit 7, and the previous print data is stored in the memory unit. Then, a correction amount is calculated based on the previous print data. However, in cases where the previous print data was printed more than a predetermined time ago, it is possible that the ink ejected onto the previous medium has sufficiently dried, and therefore step S130 can be omitted.

[0038] Next, in step S140, the printing conditions are acquired, and the correction amount is calculated based on the printing conditions. Here, the printing conditions correspond to, for example, the type of medium M, such as the material and size of the medium M used, and the conditions of the installation environment of the liquid ejection device 1. Depending on the material of the medium M, there are cases where discharge problems are likely to occur, such as those that are prone to curling, those that are difficult to dry the ejected ink, and those that have a large coefficient of friction. Therefore, the correction amount is made different depending on the material of the medium M. Also, generally, a medium M with a small size is less likely to cause discharge problems than a medium M with a large size. Also, when the temperature or humidity of the installation environment of the liquid ejection device 1 is high, the medium M may be prone to curling and discharge problems may occur. Therefore, in step S140, a suitable correction amount is calculated according to the printing conditions.

[0039] Next, in step S150, specific medium discharge conditions are determined. The discharge conditions are determined based on the correction amounts in steps S130 and S140. Specifically, the discharge conditions correspond to the extent to which the stiffness imparting member 5 should advance and the discharge angle. Only the advance amount of the stiffness imparting member 5 may be changed from the initial state without changing the discharge angle from the initial state, only the discharge angle may be changed from the initial state without changing the advance amount of the stiffness imparting member 5 from the initial state, or both the advance amount of the stiffness imparting member 5 and the discharge angle may be changed from the initial state. Then, after step S150 is completed, the discharge conditions determined in step S150 are set, and printing is performed in step S160.

[0040] In this way, in the liquid ejection device 1 of this embodiment, the control unit 7 can determine the amount of advancement based on the printing duty as well as on at least one of environmental information about the environment in which the liquid ejection device 1 is installed and the type of medium M. As described above, the optimal stiffening conditions may differ depending on the environmental information about the environment in which the liquid ejection device 1 is installed and the type of medium M, but even in such cases, the liquid ejection device 1 of this embodiment can appropriately set the amount of advancement to give the medium M suitable stiffness and reduce the risk of discharge problems.

[0041] As described above, the liquid ejection device 1 of this embodiment can determine the advance amount according to the size of the medium M. In other words, in the liquid ejection device 1 of this embodiment, when the size of the medium M as a type of the medium M is a second size smaller than the first size, the advance amount can be made smaller than that in the case of the first size by the control of the control unit 7. As described above, when the size of the medium M is small, there is little risk of discharge problems occurring, and there is no need to stiffen the medium excessively. Therefore, in the liquid ejection device 1 of this embodiment, when there is little risk of discharge problems occurring and there is no need to stiffen the medium excessively, it is possible to suppress problems that may occur due to the stiffening member 5 coming into strong contact with the medium M, such as the stiffening member coming into strong contact with insufficiently dried ink. Note that, when the size of the medium M is smaller than the desired size, the stiffening member 5 may not come into contact with the medium M discharged from the discharge port 10.

[0042] As described above, the liquid ejection device 1 of this embodiment can determine the advance amount based on the printing duty, as well as the printing duty of the previous medium M (the previous medium) that was discharged from the discharge roller pair 4 before among the media M, under the control of the control unit 7. With this configuration, for example, in cases where a lot of ink has been applied to the print image printed on the previous medium and some of the ink has not dried sufficiently, it is possible to adjust the contact conditions with the previous medium when discharging the medium and to suppress problems associated with the contact conditions with the previous medium.

[0043] As described above, in the liquid ejection device 1 of this embodiment, the stiffness enhancing member 5 has the contact portion 51 that comes into contact with the medium and the cam mechanism 53 that is connected to the contact portion 51, and the amount of advancement of the contact portion 51 can be changed by displacing the cam mechanism 53. With this configuration, the stiffness enhancing member 5 can be configured simply and favorably.

[0044] The present invention is not limited to the above-mentioned embodiments, and can be realized in various configurations without departing from the spirit of the present invention. The technical features in the embodiments corresponding to the technical features in each aspect described in the Summary of the Invention can be appropriately replaced or combined in order to solve some or all of the above-mentioned problems or to achieve some or all of the above-mentioned effects. Furthermore, if a technical feature is not described as essential in this specification, it can be appropriately deleted.

[0045] For example, in the above-described embodiment, stiffening members 5 are provided on both sides of the discharge roller pair 4 in the width direction W, and the medium M discharged from the discharge opening 10 is stiffened so that it has an upward convex shape as shown in Fig. 8. On the other hand, as a modified example, a stiffening member 5 may be provided in the center of the two discharge roller pairs 4 in the width direction W, and the medium M discharged from the discharge opening 10 may be stiffened so that it has a downward convex shape. Also, a configuration in which the stiffening members 5 and the discharge roller pairs 4 are alternately arranged may be used. [Explanation of symbols]

[0046] Reference Signs List 1...liquid ejection device, 2...pick roller, 3...pair of transport rollers (transport section), 4...pair of discharge rollers, 4A...driving roller, 4B...driven roller, 5...stiffening member, 6...head (printing section), 7...control section, 8...discharge tray, 9...setting section, 10...discharge port, 51...contact section, 51a...serrated roller, 52...rotating shaft, 53...cam mechanism, 54...rotating shaft, 55...spring, M...medium, S1...area, S2...area, S3...area, S4...area, S5...area, S6...area

Claims

1. A printing unit that ejects liquid onto a medium to print; a transport unit that transports the medium printed by the printing unit in a transport direction; a pair of discharge rollers that discharge the medium transported by the transport unit in a discharge direction that is along the transport direction when viewed from a surface direction of the medium; a stiffening member that advances toward the medium discharged from the discharge roller pair to curve the medium in a width direction intersecting with the transport direction to stiffen the medium; a control unit that determines an amount of advancement of the stiffness enhancing member based on a print duty corresponding to the amount of the liquid ejected onto the medium; A liquid ejection device comprising:

2. The liquid ejection device according to claim 1 , The liquid ejection device according to claim 1, wherein the control unit determines the advance amount based on at least one of information about an environment in which the liquid ejection device is installed and a type of the medium, in addition to the print duty.

3. The liquid ejection device according to claim 2, The liquid ejection device is characterized in that, when the size of the medium as the type of medium is a second size smaller than a first size, the control unit makes the advancement amount smaller than in the case of the first size.

4. 3. The liquid ejection device according to claim 1, The liquid ejection device is characterized in that the control unit determines the advance amount based on, in addition to the printing duty, the printing duty of the previous medium that was ejected from the ejection roller pair before among the media.

5. 3. The liquid ejection device according to claim 1, The discharge roller pair is capable of changing a discharge angle of the medium as viewed from the width direction, which is the discharge direction, The liquid ejection device according to claim 1, wherein the control unit changes the discharge angle based on the print duty.

6. 3. The liquid ejection device according to claim 1, The stiffening member is A contact portion that contacts the medium and a cam mechanism that is connected to the contact portion, A liquid ejection device, comprising: a cam mechanism for changing the advancement amount of the contact portion.

7. A printing unit that ejects liquid onto a medium to print; a transport unit that transports the medium printed by the printing unit in a transport direction; a pair of discharge rollers that discharge the medium transported by the transport unit in a discharge direction that is along the transport direction when viewed from a surface direction of the medium; A control unit capable of controlling the pair of discharge rollers; Equipped with the discharge roller pair is capable of changing a discharge angle of the medium as viewed from a width direction intersecting with the transport direction as the discharge direction, The liquid ejection device according to claim 1, wherein the control unit changes the ejection angle of the ejection roller pair based on a print duty that corresponds to an amount of the liquid ejected onto the medium.

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