Printing device

Abstract

To effectively dry a medium while suppressing uneven drying.SOLUTION: A printing device 1 comprises: a conveying unit 6; a printing unit 3; and a drying unit 10. The drying unit 10 includes a first contact heating part 131, a first airflow injection part 12A, a second contact heating part 132, and a second airflow injection part 12B. The first contact heating part 131 has a first contact heating surface 131A. The second contact heating part 132 has a second contact heating surface 132A. A first airflow injection port 121 of the first airflow injection part 12A faces the first contact heating surface 131A. A second airflow injection port 122 of the second airflow injection part 12B faces the second contact heating surface 132A. The conveying unit 6 folds a medium P such that a rear surface P2 in contact with the first contact heating surface 131A comes into contact with the second contact heating surface 132A. A first gap G1 which is a distance between the first contact heating surface 131A and the first airflow injection port 121 is larger than a second gap G2 which is a distance between the second contact heating surface 132A and the second airflow injection port 122.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] Conventionally, various printing devices have been used. Among them, there are printing devices that have a drying unit that blows hot air onto the medium or that brings a heating unit into contact with the back surface of the medium opposite the printed surface in order to dry the ink ejected onto the medium. For example, Patent Document 1, Patent Document 2, and Patent Document 3 disclose printing devices with such a configuration. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-34765 [Patent Document 2] JP 2020-199660 A [Patent Document 3] JP 2020-192697 A Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, printing devices are required to print at high speed, and therefore, there is a demand for a faster drying speed of the ink. Patent Document 1, Patent Document 2, and Patent Document 3 are technologies that meet such demands. However, when drying by blowing airflow onto the printing surface, a difference in drying speed may occur between an area where an opening that serves as an airflow outlet is formed and an area where no opening is formed, resulting in uneven drying. In addition, it is possible to suppress uneven drying by drying the medium while moving it little by little, but such a method may reduce the printing speed. In order to suppress the decrease in printing speed, it is possible to provide a buffer area that can slowly dry the medium before transporting it to the drying section. Although the decrease in printing speed can be suppressed by providing a buffer area, providing a buffer area increases the size of the device and the cost, so it may be difficult to provide a buffer area. [Means for solving the problem]

[0005] In order to solve the above problem, a printing device of the present invention includes a transport unit that transports a medium in a transport direction, a printing unit that prints by ejecting liquid onto the medium transported by the transport unit, and a drying unit that dries the medium printed by the printing unit, wherein the drying unit has a first contact heating unit, a first air flow jetting unit arranged at a position facing the first contact heating unit, a second contact heating unit provided downstream in the transport direction from the first contact heating unit, and a second air flow jetting unit arranged at a position facing the second contact heating unit, wherein the first contact heating unit has a first contact heating surface that faces the back side of the medium opposite to the printed side of the medium after printing and is in contact with the back side, and the second contact heating unit has a second air flow jetting unit that dries the medium after printing. The medium has a second contact heating surface that faces the back surface and is in contact with the back surface, a first air flow jetting port of the first air flow jetting unit faces the first contact heating surface and a second air flow jetting port of the second air flow jetting unit faces the second contact heating surface, the transporting unit has a turning portion downstream in the transport direction from the first contact heating unit and upstream in the transport direction from the second contact heating unit, the turning portion turns the medium back so that the back surface that is in contact with the first contact heating surface comes into contact with the second contact heating surface, and a first interval that is the distance between the first contact heating surface and the first air flow jetting port is wider than a second interval that is the distance between the second contact heating surface and the second air flow jetting port.

[0006] Further, a printing device of the present invention for solving the above problem includes a transport unit that transports a medium in a transport direction, a printing unit that ejects liquid onto the medium transported by the transport unit to print, a drying unit that dries the medium printed by the printing unit, a first interval adjustment unit, and a second interval adjustment unit, the drying unit having a first contact heating unit, a first air flow jetting unit arranged at a position facing the first contact heating unit, a second contact heating unit provided downstream in the transport direction from the first contact heating unit, and a second air flow jetting unit arranged at a position facing the second contact heating unit, the first contact heating unit having a first contact heating surface facing a back surface of the medium opposite to the printed surface of the medium after printing and in contact with the back surface, the second contact heating unit having a second contact heating surface facing the back surface of the medium after printing and in contact with the back surface, a first air flow jetting port of the first air flow jetting unit being disposed adjacent to the first contact heating unit, the second airflow injection unit faces the second contact heating surface, the second airflow injection unit faces the second contact heating surface, the transport unit has a turning portion downstream of the first contact heating unit in the transport direction and upstream of the second contact heating unit in the transport direction, the turning portion turns the medium so that the back surface that contacted the first contact heating surface contacts the second contact heating surface, the first contact heating surface and the second contact heating surface face in opposite directions, the first injection unit has a first airflow injection surface on which a plurality of the first airflow injection ports are arranged, the second injection unit has a second airflow injection surface on which a plurality of the second airflow injection ports are arranged, the first interval adjustment unit is capable of adjusting a first interval that is a distance between the first contact heating surface and the first airflow injection port, and the second interval adjustment unit is capable of adjusting a second interval that is a distance between the second contact heating surface and the second airflow injection port. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a side view of a printing device according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a side view showing the periphery of the drying unit of the printing apparatus shown in FIG. [Diagram 3] 2 is a plan view showing a first contact heating surface in the vicinity of the drying section of the printing apparatus shown in FIG. 1. [Figure 4] 2 is a perspective view showing the periphery of a first gap adjustment unit of the drying unit of the printing device in FIG. 1. [Diagram 5] 4 is a schematic side view illustrating a method for adjusting a first gap in the printing apparatus of FIG. 1. [Figure 6] 10 is a schematic side view illustrating a method for adjusting the first gap in a printing device according to a second embodiment of the present invention. FIG. [Figure 7] 7 is a schematic diagram showing the positional relationship between a cam and a cam follower of a first gap adjustment unit of the drying unit of the printing device in FIG. 6. [Figure 8] 7 is a schematic rear view showing the periphery of the first gap adjustment unit of the drying unit of the printing device in FIG. 6. [Figure 9] 11 is a schematic side view illustrating a method for adjusting the first gap in a printing device according to a third embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] First, the present invention will be briefly described. In order to solve the above problem, a printing device of a first aspect of the present invention includes a transport unit that transports a medium in a transport direction, a printing unit that prints by ejecting liquid onto the medium transported by the transport unit, and a drying unit that dries the medium printed by the printing unit, wherein the drying unit has a first contact heating unit, a first air flow jetting unit arranged at a position facing the first contact heating unit, a second contact heating unit provided downstream in the transport direction from the first contact heating unit, and a second air flow jetting unit arranged at a position facing the second contact heating unit, wherein the first contact heating unit has a first contact heating surface that faces the back side of the medium opposite to the printed side of the medium after printing and is in contact with the back side, and the second contact heating unit is configured to jet the medium onto the back side of the medium after printing. The present invention is characterized in that the conveying section has a second contact heating surface that faces the back surface of the medium and is in contact with the back surface, a first air flow jetting port of the first air flow jetting section faces the first contact heating surface and a second air flow jetting port of the second air flow jetting section faces the second contact heating surface, the conveying section has a turning section downstream in the conveying direction from the first contact heating section and upstream in the conveying direction from the second contact heating section, the turning section turns the medium so that the back surface that is in contact with the first contact heating surface comes into contact with the second contact heating surface, and a first interval that is the distance between the first contact heating surface and the first air flow jetting port is wider than a second interval that is the distance between the second contact heating surface and the second air flow jetting port.

[0009] According to this aspect, the first interval, which is the distance between the first contact heating surface and the first airflow nozzle, is wider than the second interval, which is the distance between the second contact heating surface and the second airflow nozzle. That is, weak air is blown to the medium on the upstream side of the conveying direction, and strong air is blown to the medium on the downstream side of the conveying direction. With this configuration, weak air is blown when the liquid is not yet dry and strong air is blown, which is likely to cause uneven drying, and strong air is blown when the liquid is somewhat dry and is unlikely to cause uneven drying even if strong air is blown. Therefore, the medium can be effectively dried while suppressing uneven drying.

[0010] A printing device according to a second aspect of the present invention is an aspect dependent on the first aspect, and is characterized in that the first interval is at least twice as wide as the second interval.

[0011] According to this aspect, the first interval is at least twice as large as the second interval. With this configuration, uneven drying can be particularly effectively suppressed.

[0012] A printing device according to a third aspect of the present invention is an aspect dependent on the first or second aspect, and is characterized in that the temperature of the first contact heating surface is lower than the temperature of the second contact heating surface.

[0013] According to this aspect, the temperature of the first contact heating surface is lower than the temperature of the second contact heating surface, which makes it possible to particularly effectively suppress uneven drying.

[0014] A printing device of a fourth aspect of the present invention is an aspect dependent on the first or second aspect, characterized in that the first air flow ejection unit has a first air flow ejection surface on which a plurality of the first air flow ejection ports are arranged, the second air flow ejection unit has a second air flow ejection surface on which a plurality of the second air flow ejection ports are arranged, the first contact heating surface and the second contact heating surface face in opposite directions to each other, the first contact heating surface is curved so as to protrude on the side opposite to the second contact heating surface side, the second contact heating surface is curved so as to protrude on the side opposite to the first contact heating surface side, the first air flow ejection surface is curved along the first contact heating surface, and the second air flow ejection surface is curved along the second contact heating surface.

[0015] According to this aspect, the first airflow ejection surface, the second airflow ejection surface, the first contact heating surface, and the second contact heating surface are curved. With this configuration, the ejection area and the heating area can be made wide even in a narrow drying section, and the medium can be dried particularly effectively.

[0016] A printing device of a fifth aspect of the present invention includes a transport unit that transports a medium in a transport direction, a printing unit that ejects liquid onto the medium transported by the transport unit to print, a drying unit that dries the medium printed by the printing unit, a first interval adjustment unit, and a second interval adjustment unit, wherein the drying unit has a first contact heating unit, a first air flow jetting unit arranged at a position facing the first contact heating unit, a second contact heating unit provided downstream in the transport direction from the first contact heating unit, and a second air flow jetting unit arranged at a position facing the second contact heating unit, wherein the first contact heating unit has a first contact heating surface that faces a back surface opposite to a printed surface of the medium after printing and is in contact with the back surface, and the second contact heating unit has a second contact heating surface that faces the back surface of the medium after printing and is in contact with the back surface, and a first air flow jetting port of the first air flow jetting unit faces the first contact heating surface and is in contact with a front surface of the medium. The second air flow injection unit has a second air flow injection port facing the second contact heating surface, the transport unit has a turning portion downstream of the first contact heating unit in the transport direction and upstream of the second contact heating unit in the transport direction, the turning portion turns the medium so that the back surface that contacted the first contact heating surface contacts the second contact heating surface, the first contact heating surface and the second contact heating surface face in opposite directions, the first air flow injection unit has a first air flow injection surface on which a plurality of the first air flow injection ports are arranged, the second air flow injection unit has a second air flow injection surface on which a plurality of the second air flow injection ports are arranged, the first interval adjustment unit is capable of adjusting a first interval that is a distance between the first contact heating surface and the first air flow injection port, and the second interval adjustment unit is capable of adjusting a second interval that is a distance between the second contact heating surface and the second air flow injection port.

[0017] According to this aspect, the first interval and the second interval can be adjusted. That is, depending on the printing conditions, the preferred air blowing force can be set, for example, to weakly blow air to the medium on the upstream side in the transport direction and strongly blow air to the medium on the downstream side in the transport direction. With this configuration, weak air blowing can be set when the liquid is not yet dry and strong air blowing is likely to cause drying unevenness, and strong air blowing can be set when the liquid is somewhat dry and strong air blowing is unlikely to cause drying unevenness. Therefore, the medium can be effectively dried while suppressing drying unevenness.

[0018] A printing device of a sixth aspect of the present invention is an aspect dependent on the fifth aspect, and is equipped with a control unit and a memory unit, wherein the memory unit stores a plurality of correspondence relationships between printing conditions for determining the first interval and the second interval and determined values ​​of the first interval and the second interval corresponding to the printing conditions, and the control unit inputs the printing conditions and controls the first interval adjustment unit and the second interval adjustment unit based on the correspondence relationships so that the first interval and the second interval become the determined values ​​corresponding to the printing conditions.

[0019] According to this aspect, the first interval and the second interval can be determined to be predetermined preferred values ​​according to the printing conditions by the control of the control unit. Therefore, the first interval and the second interval can be automatically determined to be values ​​that can effectively dry the medium while suppressing drying unevenness by the control of the control unit.

[0020] A printing device according to a seventh aspect of the present invention is an aspect dependent on the sixth aspect, and is characterized in that the printing condition is the type of the medium.

[0021] According to this aspect, the printing condition is the type of medium, and therefore, under the control of the control unit, the first interval and the second interval can be automatically determined to be predetermined preferred values ​​in accordance with the type of medium.

[0022] A printing apparatus according to an eighth aspect of the present invention is an aspect dependent on the sixth aspect, and is characterized in that the printing condition is a preset tolerance for uneven drying.

[0023] According to this aspect, the printing condition is a preset tolerance for uneven drying, and therefore, the first interval and the second interval can be automatically determined to be predetermined preferred values ​​according to the preset tolerance for uneven drying by control of the control unit.

[0024] A ninth aspect of the printing device of the present invention is an aspect dependent on the sixth aspect, and is characterized in that the printing conditions are a combination of the type of medium and a preset tolerance for drying unevenness.

[0025] According to this aspect, the printing condition is a combination of the type of medium and a preset tolerance for uneven drying, and therefore, under the control of the control unit, the first interval and the second interval can be automatically determined to be predetermined preferred values ​​according to the combination of the type of medium and the preset tolerance for uneven drying.

[0026] A printing device of a tenth aspect of the present invention is an aspect dependent on the sixth aspect, and the correspondence has a first combination which is a combination of a first printing condition as the printing condition and a first determined value as the determined value, and a second combination which is a combination of a second printing condition as the printing condition and a second determined value as the determined value, and is characterized in that when the same type of medium is dried, if the degree of drying unevenness in the printed image printed on the medium is lower when the first interval and the second interval are dried as the second determined value than when the first interval and the second interval are dried as the first determined value, the first interval in the second combination is wider than the first interval in the first combination, or the second interval in the second combination is wider than the second interval in the first combination and the first interval in the second combination is greater than or equal to the first interval in the first combination.

[0027] According to this aspect, when drying the same type of medium, if the degree of drying unevenness in the printed image printed on the medium is lower when the first interval and the second interval are dried as the second determined value than when the first interval and the second interval are dried as the first determined value, the first interval in the second combination is wider than the first interval in the first combination, or the second interval in the second combination is wider than the second interval in the first combination, and further, the first interval in the second combination is equal to or greater than the first interval in the first combination. With such a configuration, it is possible to particularly effectively dry the medium while particularly effectively suppressing drying unevenness.

[0028] An 11th aspect of the printing device of the present invention is an aspect dependent on the 10th aspect, and is characterized in that the power consumption of the drying unit under the second printing conditions is higher than the power consumption of the drying unit under the first printing conditions.

[0029] According to this aspect, the power consumption of the drying unit under the second printing condition is higher than the power consumption of the drying unit under the first printing condition. By adopting such a configuration, it is possible to achieve the same drying time under the first and second conditions.

[0030] A twelfth aspect of the printing device of the present invention is an aspect dependent on the fifth aspect, and is characterized in that the first contact heating surface and the second contact heating surface face in opposite directions to each other, the first contact heating surface is curved so as to protrude on the side opposite to the second contact heating surface side, the second contact heating surface is curved so as to protrude on the side opposite to the first contact heating surface side, the first air flow ejection surface is curved along the first contact heating surface, and the second air flow ejection surface is curved along the second contact heating surface.

[0031] According to this aspect, the first airflow ejection surface, the second airflow ejection surface, the first contact heating surface, and the second contact heating surface are curved. With this configuration, the ejection area and the heating area can be made wide even in a narrow drying section, and the medium can be dried particularly effectively.

[0032] A printing device of a thirteenth aspect of the present invention is an aspect dependent on the fifth aspect, and is characterized in that it comprises a cam follower, a frame with which the cam follower engages, and a mounting fixture that is attached to the first contact heating section and to which the cam follower is attached, and is configured such that the first interval and the second interval can be adjusted by replacing the mounting fixture to displace the position of the cam follower relative to the frame.

[0033] According to this aspect, the first interval and the second interval are adjustable by changing the position of the cam follower relative to the frame by replacing the mounting fixture. With this configuration, the first interval and the second interval can be easily adjusted.

[0034] A printing device of a 14th aspect of the present invention is an aspect dependent on the 5th aspect, and is characterized in that it comprises a cam follower, a frame with which the cam follower engages, and a mounting fixture attached to the first contact heating section and to the cam follower, wherein the mounting fixture has a cam mechanism, and by displacing the cam mechanism, the position of the cam follower relative to the frame can be displaced, thereby adjusting the first interval and the second interval.

[0035] According to this aspect, the first interval and the second interval can be adjusted by displacing the position of the cam follower relative to the frame by displacing the cam mechanism of the mounting fixture. With this configuration, the first interval and the second interval can be easily adjusted.

[0036] A printing device of a 15th aspect of the present invention is an aspect dependent on the 5th aspect, and comprises a frame attached directly or indirectly to the first contact heating section, a base section provided at a position different from the first contact heating section, the first air flow jetting section, the second contact heating section, and the second air flow jetting section, and a mounting fixture attached to the frame, wherein the mounting fixture has a cam mechanism, and is configured such that the first interval and the second interval can be adjusted by displacing the cam mechanism to displace the position of the frame relative to the base section.

[0037] According to this aspect, the first interval and the second interval can be adjusted by displacing the cam mechanism of the mounting fixture to displace the position of the frame relative to the base. With this configuration, the first interval and the second interval can be easily adjusted.

[0038] [Example 1] Hereinafter, the embodiment of the present invention will be described in detail with reference to the drawings. First, an overview of a printing device 1A of Example 1 as an example of the printing device 1 of the present invention will be described with reference to FIG. 1. As shown in FIG. 1, the printing device 1A of this example includes a setting unit 2 for setting a roll-shaped medium P, a winding unit 5 for winding up the medium P transported from the setting unit 2, and a print head 3 as a printing unit for ejecting liquid ink onto a printing surface P1 of the medium P transported in a transport direction A on a transport path from the setting unit 2 to the winding unit 5 to form an image. In addition, the printing device 1A of this example includes a platen 4 for supporting the medium P in an image forming area where an image is formed by the print head 3, and a plurality of rollers 6 provided on the transport path of the medium P. The printing device 1A of this example includes, as the rollers 6, a driving roller that imparts a transport force to the medium P as a transport unit, and a driven roller that rotates in accordance with the transport of the medium P. Furthermore, the printing device 1A of this example includes a control unit 7 including a CPU 7a, a memory unit 7b, etc., and each component of the printing device 1A of this example is driven by the control of the control unit 7.

[0039] The print head 3 is provided on the side facing the printing surface P1 of the medium P transported in the transport direction A, and ejects ink onto the printing surface P1 to form an image while the back surface P2 of the medium P opposite the printing surface P1 is supported by the platen 4. In more detail, the printing device 1A of this embodiment prints by moving the print head 3 back and forth in a scanning direction C along the transport direction A. In even more detail, the printing device 1A of this embodiment intermittently drives (intermittently transports) the medium P in the transport direction A, and moves the print head 3 back and forth in the scanning direction C to eject ink from the print head 3 to print.

[0040] The print head 3 of this embodiment can complete image formation over the entire image formation area supported by the platen 4 on the printing surface P1 in one scan (one pass), and can also complete image formation by scanning the entire image formation area multiple times (multiple passes). Naturally, when image formation is completed over multiple passes, the transport stop time of the medium P due to intermittent transport is longer than when image formation is completed in one pass.

[0041] The print head 3 in this embodiment is configured to print by moving back and forth in a scanning direction C along the transport direction A. However, there are no particular limitations on the configuration of the print head 3. Instead of the print head 3 that prints by moving back and forth in the scanning direction C along the transport direction A, a print head 3 that prints by moving back and forth in a width direction B that intersects with the transport direction A may be provided, or a so-called line head in which nozzles that eject ink over the entire width direction B of the medium P are arranged along the width direction B and the print head prints while stopped may be provided.

[0042] As shown in FIG. 1, a drying section 10 that dries ink ejected onto the medium P is provided downstream of the print head 3 in the transport direction A in the transport path of the medium P. A plurality of driven rollers 6 are provided in the transport path of the medium P from the print head 3 to the drying section 10 and in the transport path of the medium P from the drying section 10 to the winding section 5. The printing device 1A of this embodiment includes, as the drying section 10, a first drying section 10A where the medium P first arrives from the print head 3, and a second drying section 10B that can further dry the medium P after the medium P is dried by the first drying section 10A. As shown in FIG. 1, in this embodiment, the first drying section 10A and the second drying section 10B are provided above and below. However, the present invention is not limited to such a configuration.

[0043] The drying section 10 will be described in more detail below with reference to FIGS. 2 and 3. As shown in FIG. 2, the drying section 10 includes a plurality of fans 11. As described above, the drying section 10 is divided into a first drying section 10A and a second drying section 10B. In the first drying section 10A, the airflow generated by the fan 11 can be sprayed from the first airflow spraying section 12A on the lower side toward the printing surface P1 of the medium P. In the second drying section 10B, the airflow generated by the fan 11 can be sprayed from the second airflow spraying section 12B on the upper side toward the printing surface P1 of the medium P. The first airflow spraying section 12A and the second airflow spraying section 12B have the same configuration, and the first airflow spraying section 12A is shown in FIG. 3.

[0044] As shown in FIG. 3, the first airflow jetting section 12A has a plurality of first airflow jetting ports 121 arranged alternately in the width direction B and the transport direction A. As described above, since the first airflow jetting section 12A and the second airflow jetting section 12B have the same configuration, the first airflow jetting section 12A can be read as the second airflow jetting section 12B, and the first airflow jetting port 121 can be read as the second airflow jetting port 122. The first drying section 10A includes a first contact heating section 131 having a first contact heating surface 131A that contacts and heats the back surface P2 of the medium P in an area facing the first airflow jetting section 12A in the transport path of the medium P. On the other hand, the second drying section 10B includes a second contact heating section 132 having a second contact heating surface 132A that contacts and heats the back surface P2 of the medium P in an area facing the second airflow jetting section 12B in the transport path of the medium P. The second contact heating section 132 has a similar configuration to the first contact heating section 131 .

[0045] Thus, the printing device 1A of this embodiment includes the roller 6 as a transport unit that transports the medium P in the transport direction A, the print head 3 that ejects ink onto the medium P transported by the roller 6 to print, and the drying unit 10 that dries the medium P printed by the print head 3. The drying unit 10 is divided into a first drying unit 10A and a second drying unit 10B. The first drying unit 10A includes a first contact heating unit 131 and a first airflow jetting unit 12A that is disposed at a position opposite the first contact heating unit 131. The second drying unit 10B includes a second contact heating unit 132 that is provided downstream of the first contact heating unit 131 in the transport direction A, and a second airflow jetting unit 12B that is disposed at a position opposite the second contact heating unit 132.

[0046] The first contact heating section 131 faces the back surface P2 of the medium P after printing and has a first contact heating surface 131A in contact with the back surface P2. The second contact heating section 132 faces the back surface P2 of the medium P after printing and has a second contact heating surface 132A in contact with the back surface P2. The first air flow ejection port 121 of the first air flow ejection section 12A faces the first contact heating surface 131A. The second air flow ejection port 122 of the second air flow ejection section 12B faces the second contact heating surface 132A.

[0047] 1 and 2, the roller 6 disposed between the first drying section 10A and the second drying section 10B in the transport path of the medium P folds back the transport path of the medium P. In other words, the roller 6 disposed between the first drying section 10A and the second drying section 10B is a folding back section 61 located downstream in the transport direction A of the first contact heating section 131 and upstream in the transport direction A of the second contact heating section 132. The folding back section 61 folds back the medium P so that the back surface P2 in contact with the first contact heating surface 131A comes into contact with the second contact heating surface 132A.

[0048] 2, the space between the first contact heating surface 131A and the first air flow ejection section 12A and the space between the second contact heating surface 132A and the second air flow ejection section 12B form a transport path for the medium P. As shown in FIG. 2, in the printing device 1A of this embodiment, a first interval G1, which is the distance between the first contact heating surface 131A and the first air flow ejection port 121, is configured to be wider than a second interval G2, which is the distance between the second contact heating surface 132A and the second air flow ejection port 122.

[0049] Thus, in the printing device 1A of this embodiment, the first interval G1 is wider than the second interval G2. In the drying section 10, the medium P is transported in contact with the first contact heating surface 131A and the second contact heating surface 132A. Therefore, the airflow blown from the first airflow nozzle 121 is weaker than the airflow blown from the second airflow nozzle 122 as the distance from the airflow nozzle to the medium P increases. That is, the printing device 1A of this embodiment blows weak air to the medium P on the upstream side of the transport direction A, and blows strong air to the medium P on the downstream side of the transport direction A. With this configuration, weak air can be blown when the ink is not yet dry and strong air blowing is likely to cause drying unevenness, and strong air can be blown when the ink is somewhat dry and strong air blowing is unlikely to cause drying unevenness. Therefore, the printing device 1A of this embodiment can effectively dry the medium P while suppressing drying unevenness.

[0050] In the printing device 1A of this embodiment, the first interval G1 is 40 mm, and the second interval G2 is 10 mm. Thus, in the printing device 1A of this embodiment, the first interval G1 is four times the second interval G2, but it is preferable that the first interval G1 is at least two times wider than the second interval G2. This is because uneven drying can be particularly effectively suppressed by adopting such a configuration.

[0051] As shown in Figs. 2 and 3, in the printing device 1A of this embodiment, the first airflow ejection section 12A has a first airflow ejection surface 120A on which a plurality of first airflow ejection ports 121 are arranged, and the second airflow ejection section 12B has a second airflow ejection surface 120B on which a plurality of second airflow ejection ports 122 are arranged. As shown in Fig. 2, the first contact heating surface 131A facing downward and the second contact heating surface 132A facing upward are directed in opposite directions. The first contact heating surface 131A is curved so as to protrude downward on the side opposite to the second contact heating surface 132A side, and the second contact heating surface 132A is curved so as to protrude upward on the side opposite to the first contact heating surface 131A side. The first airflow ejection surface 120A is curved along the first contact heating surface 131A, and the second airflow ejection surface 120B is curved along the second contact heating surface 132A. In this way, by configuring the first airflow ejection surface 120A, the second airflow ejection surface 120B, the first contact heating surface 131A, and the second contact heating surface 132A to be curved, the ejection area and the heating area can be made wide even in the narrow drying section 10, and the medium P can be dried particularly effectively. In addition, by configuring the first contact heating surface 131A and the second contact heating surface 132A to be curved, the medium P can be brought into close contact with the first contact heating surface 131A and the second contact heating surface 132A, and the transfer rate of heat from the first contact heating surface 131A and the second contact heating surface 132A to the medium P can be further increased.

[0052] There is no particular limitation on the temperature of the first contact heating surface 131A and the temperature of the second contact heating surface 132A. However, it is preferable that the temperature of the first contact heating surface 131A is lower than the temperature of the second contact heating surface 132A. This is because such a configuration can effectively suppress uneven drying.

[0053] As described above, the printing device 1A of this embodiment has a first interval G1 of 40 mm and a second interval G2 of 10 mm. On the other hand, the printing device 1A of this embodiment is capable of changing the first interval G1 and the second interval G2. As shown in FIG. 2, the printing device 1A of this embodiment is provided with two first interval adjustment units 21 that can adjust the first interval G1, namely, the first interval adjustment unit 21A and the first interval adjustment unit 21B. Also, the printing device 1A of this embodiment is provided with two second interval adjustment units 22 that can adjust the second interval G2, namely, the second interval adjustment unit 22A and the second interval adjustment unit 22B. The first interval adjustment unit 21A, the first interval adjustment unit 21B, the second interval adjustment unit 22A, and the second interval adjustment unit 22B all have the same configuration.

[0054] 4 shows the periphery of first gap adjustment part 21A, and as shown in Fig. 4, first gap adjustment part 21A includes a fixture 202 fixed to first contact heating part 131, a cam follower 201 attached to the fixture 202, and a frame 200 on which a movement path 200A of cam follower 201 is provided. As described above, first gap adjustment part 21B, second gap adjustment part 22A, and second gap adjustment part 22B, which have the same configuration as first gap adjustment part 21A, are also similar.

[0055] 2, the first contact heating part 131 and the second contact heating part 132 are provided with a grip part 30, and the user can pull out the first contact heating part 131 and the second contact heating part 132 by gripping the grip part 30 and pulling it out in approximately the width direction B. Pulling out the first contact heating part 131 and the second contact heating part 132 makes it possible to easily clean the first contact heating part 131 and the second contact heating part 132.

[0056] When the first contact heating unit 131 and the second contact heating unit 132 are pulled out, the cam follower 201 moves along the movement path 200A. In the printing apparatus 1A of this embodiment, it is possible to replace the fixture 202 to which the cam follower 201 is attached. By replacing the fixture 202, it is possible to change the fixture 202 to a fixture 202 with a different height H. For example, as shown by the displacement from the upper state to the lower state in FIG. 5, the fixture 202A with a high height H can be replaced with the fixture 202B with a low height H. By replacing the fixture 202A with a high height H with the fixture 202B with a low height H, the first interval G1 can be changed from a narrow state to a wide state. In the printing apparatus 1A of this embodiment, the second interval G2 can be changed by replacing the fixture 202 with a fixture with a different height H.

[0057] That is, the printing device 1A of this embodiment includes a first interval adjustment unit 21A and a second interval adjustment unit 22A. The first interval adjustment unit 21 can adjust the first interval G1, which is the distance between the first contact heating surface 131A and the first air flow nozzle 121, and the second interval adjustment unit 22 can adjust the second interval G2, which is the distance between the second contact heating surface 132A and the second air flow nozzle 122. In this way, by configuring the device to be able to adjust the first interval G1 and the second interval G2, it is possible to blow air weakly to the medium P on the upstream side of the transport direction A and blow air strongly to the medium P on the downstream side of the transport direction A with a preferable air blowing force according to the printing conditions. By configuring the device in this way, it is possible to blow air weakly when the ink is not yet dry and strong air blowing is likely to cause drying unevenness, and blow air strongly when the ink is somewhat dry and strong air blowing is unlikely to cause drying unevenness. Therefore, it is possible to effectively dry the medium P while suppressing drying unevenness.

[0058] As described above, in the printing device 1A of this embodiment, the first contact heating surface 131A and the second contact heating surface 132A face in opposite directions. The first contact heating surface 131A is curved so as to protrude on the side opposite to the second contact heating surface 132A. The second contact heating surface 132A is curved so as to protrude on the side opposite to the first contact heating surface 131A. The first airflow ejection surface 120A is curved along the first contact heating surface 131A, and the second airflow ejection surface 120B is curved along the second contact heating surface 132A. With this configuration, the printing device 1A of this embodiment can provide a wide ejection area and heating area even in the narrow drying section 10, and can dry the medium P particularly effectively.

[0059] As described above, the printing device 1A of this embodiment includes the cam follower 201, the frame 200 with which the cam follower 201 engages, and the attachment 202 that is attached to the first contact heating unit 131 and to which the cam follower 201 is attached. The printing device 1A of this embodiment is configured such that the first interval G1 and the second interval G2 can be adjusted by replacing the attachment 202 to displace the position of the first contact heating unit 131 relative to the frame 200. With this configuration, the printing device 1A of this embodiment can easily adjust the first interval G1 and the second interval G2.

[0060] [Example 2] Next, the printing device 1B of the second embodiment will be described with reference to Figures 6, 7, and 8. Note that Figure 6 is a view corresponding to Figure 5 of the printing device 1A of the first embodiment. In Figures 6 to 8, components common to the above-mentioned first embodiment are indicated by the same reference numerals, and detailed description will be omitted. Here, the printing device 1B of this embodiment has the same configuration as the printing device 1A of the first embodiment, except for the configuration of the first interval adjustment unit 21 and the second interval adjustment unit 22. Therefore, except for the parts described below, the printing device 1B of this embodiment has the same characteristics as the printing device 1A of the first embodiment.

[0061] As described above, the printing device 1A of the first embodiment is configured to be able to adjust the first gap G1 and the second gap G2 by displacing the position of the cam follower 201 relative to the frame 200 by replacing the mounting fixture 202. On the other hand, the printing device 1B of the present embodiment is provided with the first gap adjustment unit 21 and the second gap adjustment unit 22 that are configured differently from the first gap adjustment unit 21 and the second gap adjustment unit 22 of the printing device 1A of the first embodiment.

[0062] Specifically, as shown in Fig. 6, the printing device 1B of this embodiment is common to the printing device 1A of the first embodiment in that it includes a cam follower 201, a frame 200 with which the cam follower 201 engages, and a fixture 202 that is attached to the first contact heating unit 131 and to which the cam follower 201 (cam follower 201A) is attached. On the other hand, the configuration of the fixture 202 (fixture 202C) is different from the configuration of the fixture 202 of the printing device 1A of the first embodiment.

[0063] 6 and 8, the mounting fixture 202C of the printing device 1B of this embodiment includes a motor 208, a motor fixing part 209, a cam mechanism consisting of a cam follower 201 (cam follower 201B) and a cam 207, a moving part 203 on which the cam follower 201 is provided, a moving shaft 205 of the moving part 203, a linear bushing 204 attached to the moving shaft 205, and a holder 206 that is provided on the first contact heating part 131 and fixes the moving shaft 205. The printing device 1B of this embodiment is configured to be able to adjust the first interval G1 by driving the motor 208 and rotating the cam 207 in a rotation direction R1 based on the motor shaft 208A of the motor 208 as shown in FIG. 7 to displace the cam mechanism, thereby displacing the position of the first contact heating part 131 in the vertical direction relative to the frame 200. 7, the cam 207 is provided with a movement path 207A for the rectangular cam follower 201, with the center position shifted from that of the motor shaft 208A. The position of the movement path 207A relative to the cam follower 201 can be changed by driving the motor 208, thereby displacing the positions in the vertical direction of the motor shaft 208A, the motor fixing part 209 to which the motor 208 is fixed, and the first contact heating part 131 to which the motor fixing part 209 is fixed.

[0064] The printing device 1B of this embodiment includes a second interval adjustment unit 22 that is configured similarly to the first interval adjustment unit 21, and is configured to be able to adjust the first interval G2 as well. With this configuration, the printing device 1B of this embodiment can easily adjust the first interval G1 and the second interval G2.

[0065] The printing device 1B of this embodiment is configured to be able to automatically change the first interval G1 and the second interval G2 in accordance with the printing conditions under the control of the control unit 7. In other words, the printing device 1B of this embodiment stores in the memory unit 7b a plurality of printing modes (interval adjustment modes) that result in the first interval G1 and the second interval G2 in accordance with the printing conditions.

[0066] In other words, the memory unit 7b stores a plurality of correspondences between printing conditions for determining the first interval G1 and the second interval G2 and the determined values ​​of the first interval G1 and the second interval G2 corresponding to the printing conditions. The control unit 7 inputs the printing conditions and can control the first interval adjustment unit 21 and the second interval adjustment unit 22 based on the correspondences so that the first interval G1 and the second interval G2 become determined values ​​corresponding to the printing conditions. Therefore, in the printing device 1B of this embodiment, the control unit 7 controls the driving of the motor 208, so that the first interval G1 and the second interval G2 can be determined to predetermined preferable values ​​according to the printing conditions. Therefore, in the printing device 1B of this embodiment, the control unit 7 can automatically set the first interval G1 and the second interval G2 to be capable of effectively drying the medium P while suppressing drying unevenness.

[0067] Specifically, the printing device 1B of this embodiment stores the table shown in Table 1 below in the storage unit 7b, and can automatically select printing modes A to F corresponding to the printing conditions shown in Table 1. The first interval G1 and second interval G2 for printing modes A to F, as well as the temperature (first contact heating surface temperature) of the first contact heating surface 131A and the temperature (second contact heating surface temperature) of the second contact heating surface 132A are as shown in Table 1. The numbers for the likelihood of unevenness are divided into six ranks from 1 to 6 corresponding to the likelihood of unevenness, and the larger the value from 1 to 6, the more likely unevenness is to occur. That is, printing mode A is most likely to cause unevenness, and printing mode F is least likely to cause unevenness. On the other hand, power consumption increases as the value increases from 1 to 6. That is, power consumption is the lowest for printing mode A and the highest for printing mode F.

[0068] [Table 1]

[0069] In the printing device 1B of this embodiment, the table shown in Table 2 below is stored in the storage unit 7b, and gap adjustment mode A to gap adjustment mode F can be automatically selected in accordance with the medium type as a printing condition and the user's subjective tolerance for unevenness as a printing condition. The user can input the medium type and the tolerance for unevenness to the control unit 7 via an operation unit (not shown). Medium types a, b, c, and d in Table 2 are film-based media, and medium types e and f in Table 2 are paper-based media.

[0070] [Table 2]

[0071] As described above, the printing conditions in the printing device 1B of this embodiment include the type of medium P. Although the occurrence state of unevenness varies greatly depending on the type of medium P, the printing device 1B of this embodiment includes the type of medium P as a printing condition, and thus can automatically determine the first interval G1 and the second interval G2 to predetermined preferred values ​​according to the type of medium P under the control of the control unit 7.

[0072] As described above, in the printing device 1B of this embodiment, the printing conditions include a tolerance for drying unevenness that is preset by, for example, a user. Although the tolerance for drying unevenness varies depending on the intended use of the printed matter, the printing device 1B of this embodiment includes the tolerance for drying unevenness as a printing condition, and therefore, under the control of the control unit 7, can automatically determine the first interval G1 and the second interval G2 to predetermined preferred values ​​according to the preset tolerance for drying unevenness.

[0073] As described above, in the printer 1B of this embodiment, the printing conditions are a combination of the type of medium P and a preset tolerance for drying unevenness. Therefore, under the control of the control unit 7, the first interval G1 and the second interval G2 can be automatically determined to be predetermined preferred values ​​in accordance with the combination of the type of medium P and the preset tolerance for drying unevenness.

[0074] In Table 1, the correspondence between the printing conditions in the printing device 1B of this embodiment and the determined values ​​of the first interval G1 and the second interval G2 is such that, when a first combination is a combination of a first printing condition as a printing condition and a first determined value as a determined value, and a second combination is a combination of a second printing condition as a printing condition and a second determined value as a determined value, if the degree of drying unevenness in the printed image printed on the medium P is lower when the first interval G1 and the second interval G2 are dried as the second determined values ​​(e.g., printing mode B) than when the first interval G1 and the second interval G2 are dried as the first determined values ​​(e.g., printing mode A), then the correspondence between the printing conditions and the determined values ​​of the first interval G1 and the second interval G2 satisfies both the first and second conditions below. As the first condition, for example, when the first combination is print mode A and the second combination is print mode B, at least the first interval G1 (e.g., 10 mm) in the second combination (e.g., print mode B) is wider than the first interval G1 (e.g., 5 mm) in the first combination (e.g., print mode A), or the second interval G2 (e.g., 10 mm) in the second combination (e.g., print mode B) is wider than the second interval G2 (e.g., 5 mm) in the first combination (e.g., print mode A). As the second condition, the first interval G1 (e.g., 10 mm) in the second combination (e.g., print mode B) is equal to or larger than the first interval G1 (e.g., 5 mm) in the first combination (e.g., print mode A).

[0075] This relationship holds true not only when the first combination is printing mode A and the second combination is printing mode B, but also when the first combination is printing mode B and the second combination is printing mode C. It holds true when the first combination is printing mode C and the second combination is printing mode D. It holds true when the first combination is printing mode D and the second combination is printing mode E. It holds true when the first combination is printing mode E and the second combination is printing mode F. By setting such a relationship, when the same type of medium P is dried, the degree of drying unevenness in the printed image printed on the medium P is lower when the first interval G1 and the second interval G2 are dried as the second determined value than when the first interval G1 and the second interval G2 are dried as the first determined value. By using such a configuration, it is possible to dry the medium particularly effectively while particularly effectively suppressing drying unevenness.

[0076] As shown in Table 1, the temperature of the first contact heating surface 131A and the temperature of the second contact heating surface 132A are higher under the second condition (e.g., printing mode B) than under the first condition (e.g., printing mode A), and therefore, in the printing device 1B of this embodiment, the power consumption of the drying unit 10 under the second printing condition is higher than the power consumption of the drying unit 10 under the first printing condition. With this configuration, even if the first interval G1 and the second interval G2 under the second condition are wider than those under the first condition, the drying times when drying the same type of medium P under the first condition and the second condition can be made equivalent.

[0077] [Example 3] Next, a printing device 1C of Example 3 will be described with reference to FIG. 9. FIG. 9 corresponds to FIG. 5 showing the printing device 1 of Example 1. In FIG. 9, components common to Examples 1 and 2 are indicated with the same reference numerals, and detailed description will be omitted. Here, the printing device 1C of this example has the same configuration as the printing device 1 of Examples 1 and 2, except for the configuration of the first interval adjustment unit 21 and the second interval adjustment unit 22. Therefore, except for the parts described below, the printing device 1C of this example has the same characteristics as the printing device 1 of Examples 1 and 2.

[0078] As described above, in the printing apparatus 1B of the second embodiment, the holder 206 is provided, for example, in the first contact heating section 131. On the other hand, as shown in Fig. 9, in the printing apparatus 1C of the present embodiment, the holder 206 is provided in the base section 210. The base section 210 is provided and fixed in a position different from the first contact heating section 131, the first air current ejection section 12A, the second contact heating section 132, and the second air current ejection section 12B.

[0079] In detail, in the printing apparatus 1C of this embodiment, the frame 200 is indirectly attached to the first contact heating unit 131 via the cam follower 201A and the attachment 202A. However, the frame 200 may be directly attached to the first contact heating unit 131. The printing apparatus 1C of this embodiment includes an attachment 202D attached to the base 210 and the frame 200. The attachment 202D has a cam mechanism consisting of a cam follower 201B and a cam 207, and is configured such that the first interval G1 and the second interval G2 can be adjusted by displacing the cam mechanism to displace the position of the frame 200 relative to the base 210. The printing apparatus 1C of this embodiment is configured in this way, so that the first interval G1 and the second interval G2 can be easily adjusted.

[0080] The configurations of the cam follower 201A and the attachment 202A of the printing apparatus 1C of this embodiment are similar to those of the cam follower 201 and the attachment 202A of the printing apparatus 1A of embodiment 1. The configurations of the cam follower 201B, the motor 208, the motor fixing part 209, the cam mechanism consisting of the cam follower 201B and the cam 207, the moving part 203, the moving shaft 205, the linear bushing 204, and the holder 206 of the printing apparatus 1C of this embodiment are similar to those of the cam follower 201B, the motor 208, the motor fixing part 209, the cam mechanism, the moving part 203, the moving shaft 205, the linear bushing 204, and the holder 206 of the printing apparatus 1B of embodiment 2. However, the configurations are not limited to these.

[0081] 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. For example, the technical features in the embodiments corresponding to the technical features in each aspect described in the Summary of the Invention column 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. [Explanation of symbols]

[0082] 1...printing device, 1A...printing device, 1B...printing device, 1C...printing device, 2...setting section, 3...print head (printing section), 4...platen, 5...winding section, 6...roller (transport section), 7...control section, 7a...CPU, 7b...storage section, 10...drying section, 10A...first drying section, 10B...second drying section, 11...fan, 12A...first air flow ejection section, 12B...second air flow ejection section, 21...first gap adjustment section, 21A...first gap adjustment section, 21B...first gap adjustment section, 22...second gap adjustment section, 22A...second gap adjustment section, 22B...second gap adjustment section, 30...gripping section, 61...folding section, 120A...first air flow ejection surface, 120B...second air flow ejection surface, 121...first air flow ejection port, 122...second Air flow nozzle, 131...first contact heating section, 131A...first contact heating surface, 132...second contact heating section, 132A...second contact heating surface, 200...frame, 200A...moving path, 201...cam follower, 201A...cam follower, 201B...cam follower, 202...mounting fixture, 202A...mounting fixture, 202B...mounting fixture, 202C...mounting fixture, 202D...mounting fixture, 203...moving section, 204...linear bushing, 205...moving shaft, 206...holder, 207...cam, 207A...moving path, 208...motor, 208A...motor shaft, 209...motor fixing section, 210...base, G1...first interval, G2...second interval, P...medium, P1...printing surface, P2...rear surface

Claims

1. a transport unit that transports a medium in a transport direction, a printing unit that ejects a liquid onto the medium transported by the transport unit to print, and a drying unit that dries the medium printed by the printing unit, The drying section includes a first contact heating section, a first air flow jetting section disposed at a position opposite to the first contact heating section, a second contact heating section provided downstream in the transport direction from the first contact heating section, and a second air flow jetting section disposed at a position opposite to the second contact heating section, the first contact heating unit has a first contact heating surface that faces a back surface of the medium opposite to the printed surface after printing and that contacts the back surface; the second contact heating unit has a second contact heating surface that faces the back surface of the medium after printing and that contacts the back surface; The first airflow injection port of the first airflow injection unit faces the first contact heating surface, The second airflow injection port of the second airflow injection unit faces the second contact heating surface, The transport section has a turn-back section downstream of the first contact heating section in the transport direction and upstream of the second contact heating section in the transport direction, the folding portion folds the medium so that the back surface that contacts the first contact heating surface contacts the second contact heating surface; A printing device characterized in that a first interval, which is a distance between the first contact heating surface and the first air flow nozzle, is wider than a second interval, which is a distance between the second contact heating surface and the second air flow nozzle.

2. 2. The printing device according to claim 1, A printing device, wherein the first interval is at least twice as large as the second interval.

3. 3. The printing device according to claim 1, A printing apparatus, characterized in that the temperature of the first contact heating surface is lower than the temperature of the second contact heating surface.

4. 3. The printing device according to claim 1, The first airflow injection unit has a first airflow injection surface on which a plurality of the first airflow injection ports are arranged, The second airflow injection unit has a second airflow injection surface on which a plurality of the second airflow injection ports are arranged, The first contact heating surface and the second contact heating surface face in opposite directions to each other, The first contact heating surface is curved so as to protrude toward the opposite side to the second contact heating surface, The second contact heating surface is curved so as to protrude toward the opposite side to the first contact heating surface, The first airflow injection surface is curved along the first contact heating surface, A printing device, wherein the second airflow ejection surface is curved along the second contact heating surface.

5. a conveying unit that conveys a medium in a conveying direction, a printing unit that ejects a liquid onto the medium conveyed by the conveying unit to print on the medium, a drying unit that dries the medium printed by the printing unit, a first interval adjustment unit, and a second interval adjustment unit, The drying section includes a first contact heating section, a first air flow jetting section disposed at a position opposite to the first contact heating section, a second contact heating section provided downstream in the transport direction from the first contact heating section, and a second air flow jetting section disposed at a position opposite to the second contact heating section, the first contact heating unit has a first contact heating surface that faces a back surface of the medium opposite to the printed surface after printing and that contacts the back surface; the second contact heating unit has a second contact heating surface that faces the back surface of the medium after printing and that contacts the back surface; The first airflow injection port of the first airflow injection unit faces the first contact heating surface, The second airflow injection port of the second airflow injection unit faces the second contact heating surface, The transport section has a turn-back section downstream of the first contact heating section in the transport direction and upstream of the second contact heating section in the transport direction, the folding portion folds the medium so that the back surface that contacts the first contact heating surface contacts the second contact heating surface; The first contact heating surface and the second contact heating surface face in opposite directions to each other, The first airflow injection unit has a first airflow injection surface on which a plurality of the first airflow injection ports are arranged, The second airflow injection unit has a second airflow injection surface on which a plurality of the second airflow injection ports are arranged, The first gap adjustment unit is capable of adjusting a first gap, which is a distance between the first contact heating surface and the first airflow injection port, A printing device, characterized in that the second gap adjustment unit is capable of adjusting a second gap, which is a distance between the second contact heating surface and the second airflow ejection port.

6. 6. The printing device according to claim 5, A control unit and a storage unit are provided, the storage unit stores a plurality of correspondence relationships between printing conditions for determining the first interval and the second interval and determined values ​​of the first interval and the second interval corresponding to the printing conditions; A printing device characterized in that the control unit inputs the printing conditions and controls the first interval adjustment unit and the second interval adjustment unit based on the correspondence relationship so that the first interval and the second interval become the determined values ​​corresponding to the printing conditions.

7. 7. The printing device according to claim 6, The printing device, wherein the printing condition is a type of the medium.

8. 7. The printing device according to claim 6, The printing device according to claim 1, wherein the printing condition is a preset tolerance for uneven drying.

9. 7. The printing device according to claim 6, The printing device according to claim 1, wherein the printing conditions are a combination of the type of the medium and a preset tolerance for uneven drying.

10. 7. The printing device according to claim 6, the correspondence relationship includes a first combination that is a combination of a first printing condition as the printing condition and a first determination value as the determination value, and a second combination that is a combination of a second printing condition as the printing condition and a second determination value as the determination value, When the same type of medium is dried, a degree of drying unevenness in a print image printed on the medium is lower when the first interval and the second interval are dried using the second determined value than when the medium is dried using the first interval and the second determined value. the first interval in the second combination is wider than the first interval in the first combination, or the second interval in the second combination is wider than the second interval in the first combination, and a printing device in which the first interval in the second combination is equal to or greater than the first interval in the first combination.

11. 11. The printing device according to claim 10, A printing apparatus, characterized in that power consumption of the drying unit under the second printing condition is higher than power consumption of the drying unit under the first printing condition.

12. 6. The printing device according to claim 5, The first contact heating surface and the second contact heating surface face in opposite directions to each other, The first contact heating surface is curved so as to protrude toward the opposite side to the second contact heating surface, The second contact heating surface is curved so as to protrude toward the opposite side to the first contact heating surface, The first airflow injection surface is curved along the first contact heating surface, A printing device, wherein the second airflow ejection surface is curved along the second contact heating surface.

13. 6. The printing device according to claim 5, Cam follower and a frame with which the cam follower engages; a mounting fixture that is attached to the first contact heating portion and to which the cam follower is attached; Equipped with A printing device characterized in that the first gap and the second gap are adjustable by replacing the mounting fixture to displace the position of the first contact heating portion relative to the frame.

14. 6. The printing device according to claim 5, Cam follower and a frame with which the cam follower engages; a mounting fixture attached to the first contact heating portion and to the cam follower; Equipped with The mounting fixture has a cam mechanism, A printing device characterized in that the first gap and the second gap can be adjusted by displacing the cam mechanism to displace the position of the first contact heating portion relative to the frame.

15. 6. The printing device according to claim 5, A frame attached directly or indirectly to the first contact heating portion; A mounting fixture is attached to a base portion provided at a position different from the first contact heating portion, the first air flow jetting portion, the second contact heating portion, and the second air flow jetting portion, and to the frame; Equipped with The mounting fixture has a cam mechanism, A printing device characterized in that the first gap and the second gap are adjustable by displacing the cam mechanism to displace the position of the frame relative to the base portion.

Images