LIQUID EJECTION APPARATUS AND METHOD FOR ADJUSTING POSITION OF MAINTENANCE UNIT

Abstract

To provide a liquid discharge device that facilitates work for adjusting a height to shorten a time required in the work for adjusting, and a position adjustment method of a maintenance unit.SOLUTION: A liquid discharge device (printing device 1) comprises: a conveying roller 23; a maintenance unit 60; a frame member (side frame 10) that extends along a second direction that is opposite to a first direction in which liquid (ink) is discharged from a nozzle to support the conveying roller 23; a mounting part (plate member 50) on which the maintenance unit 60 is mounted; and a position adjustment part 70 (height adjustment part 72) that can adjust a position in the first direction or in the second direction of the plate member 50. In the plate member 50 is arranged at least one protruding part 53 that is inserted and fitted into opening parts 11 opened to the side frame 10.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a liquid ejection apparatus and a method for adjusting the position of a maintenance unit. [Background technology]

[0002] Conventionally, in the liquid ejection device of Patent Document 1, first, height adjustment (position adjustment) is performed at each of a first position and a second position located on the same straight line in the width direction to form a reference height for the plate member that supports the maintenance unit, and then height adjustment (position adjustment) is performed at a third position that is not on the same straight line to achieve positional accuracy of the plate member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-158964 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the liquid ejection device shown in Patent Document 1, an operator is required to establish a height reference using height adjustment units installed at the first and second positions, and this adjustment work is time-consuming and laborious. [Means for solving the problem]

[0005] The liquid ejection device comprises a transport roller for transporting a medium, a head having a nozzle surface with a plurality of nozzles for ejecting liquid onto the medium, a maintenance unit for maintaining the head, a frame member extending along a second direction opposite to a first direction in which the liquid is ejected from the nozzles and supporting the transport roller, a mounting portion to which the maintenance unit is attached, and a position adjustment portion capable of adjusting the position of the mounting portion in the first direction or the second direction, and is characterized in that the mounting portion is provided with at least one protrusion that is inserted into an opening formed in the frame member.

[0006] A method for adjusting the position of a maintenance unit of a liquid ejection device including a transport roller that transports a medium in a transport direction, a head having a nozzle surface with a plurality of nozzles that eject liquid onto the medium, a maintenance unit that maintains the head, a frame member extending along a second direction opposite to a first direction in which the liquid is ejected from the nozzles and supporting the transport roller, a mounting portion to which the maintenance unit is attached, and a position adjustment portion capable of adjusting the position of the mounting portion in the first direction or the second direction, the method for adjusting the position of a maintenance unit is characterized in that it includes the steps of inserting at least one protrusion disposed on the mounting portion into an opening formed in the frame member, and after inserting at least one protrusion into the opening, adjusting the position of the mounting portion in the first direction or the second direction by the position adjustment portion. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a configuration diagram showing a printing apparatus according to a first embodiment. [Diagram 2] FIG. 2 is a perspective view showing a main part of the printing device. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6]FIG. 13 is a perspective view showing the side frame and the position adjustment portion with the plate member removed. [Figure 7] 11 is a schematic side view of the protruding portion of the plate member and the opening of the side frame as viewed from the -X axis direction. FIG. [Figure 8] FIG. [Figure 9] FIG. [Figure 10] 11 is a flowchart showing a position adjustment method. [Figure 11] FIG. 11 is a schematic perspective view showing a position adjustment unit according to a second embodiment. [Figure 12] FIG. [Figure 13] FIG. 4 is a schematic cross-sectional view showing height adjustment by a cam. [Figure 14] FIG. 11 is a schematic cross-sectional view illustrating a first modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, embodiments of the liquid ejection device will be described with reference to the drawings. In addition, in each drawing used in the following description (particularly the drawings relating to the second embodiment), the scale of each component is appropriately changed so that each component is of a recognizable size. In the following embodiments, an ink jet printer (hereinafter simply referred to as a printing device) will be exemplified as a liquid ejection device.

[0009] 1. First embodiment Fig. 1 is a configuration diagram showing a printing device 1 according to the present embodiment, and Fig. 2 is a perspective view showing a main part of the printing device 1. The printing apparatus 1 is a so-called large format printing apparatus (LFP) that handles a relatively large medium M. The medium M in this embodiment is formed of a polyvinyl chloride film having a width of, for example, about 64 inches.

[0010] Note that the XYZ coordinate system is used in FIG. 1 and the subsequent drawings. It is assumed that the printing device 1 is placed on a horizontal plane (XY plane). In this case, the Z axis is an axis perpendicular to the XY plane. Hereinafter, the direction along this Z axis will be referred to as the Z axis direction, the upward direction, the downward direction, or the height direction. Note that the direction in which ink as a liquid is ejected from the head 31, which will be described later, is referred to as the first direction, and the direction opposite to the first direction is referred to as the second direction. In this case, in this embodiment, the first direction corresponds to the downward direction, and the second direction corresponds to the upward direction.

[0011] The X-axis intersects with the Z-axis (orthogonal in this embodiment) and is an axis along the longitudinal direction of the main body frame 100. Hereinafter, the direction along this X-axis will be referred to as the X-axis direction, width direction, or main scanning direction. The Y-axis intersects with both the X-axis and Z-axis (orthogonal in this embodiment). Hereinafter, the direction along this Y-axis will also be referred to as the Y-axis direction, front-rear direction, or sub-scanning direction.

[0012] In the front-to-rear direction, the front side or front face of the printing device 1 is the +Y-axis direction, and the rear side or rear face of the printing device 1 is the -Y-axis direction. In the width direction, when the printing device 1 is viewed from the front side, the left side of the device is the +X-axis direction, and the right side of the device is the -X-axis direction. In the Z-axis direction, the upper side, upper part, top surface, etc. of the device are the +Z-axis direction, and the lower side, lower part, bottom surface, etc. of the device are the -Z-axis direction. The Y-axis direction corresponds to the transport direction F in the recording unit 3. The positional relationship along the transport direction F of the printing medium M is referred to as upstream and downstream.

[0013] In this embodiment, the direction in which ink is ejected is the -Z axis direction, and the direction parallel to the ejection direction is the Z axis direction (height direction). However, this is not limited to this, and there may be an inclination between the ink ejection direction and the -Z axis direction. Furthermore, there may also be an inclination between the direction parallel to the ejection direction (height direction) and the Z axis direction.

[0014] 1, the printing device 1 has a transport unit 2 that transports a medium M by a roll-to-roll method, a recording unit 3 that ejects ink as a liquid onto the medium M to record images, characters, and the like, and a heating unit 4 that heats the medium M. Each of these components is supported by a leg frame 5.

[0015] The transport unit 2 has a roll 21 that feeds out the rolled medium M, and a roll 22 that winds up the fed medium M. The transport unit 2 has a transport roller 23 that transports the medium M on a transport path between the rolls 21 and 22. The transport unit 2 also has a tension roller 25 that applies tension to the medium M. The tension roller 25 is supported by a swingable frame 26 that can swing around a predetermined rotation axis.

[0016] The recording unit 3 has an inkjet head (hereinafter referred to as head 31) that ejects ink onto the transported medium M, and a carriage 32 that mounts the head 31 and is capable of reciprocating in the width direction (X-axis direction). The head 31 has a plurality of nozzles (not shown) and a nozzle surface 31a on which the nozzles are provided, and is configured to be able to eject ink that is selected in relation to the medium M and requires penetrative drying or evaporative drying.

[0017] The heating unit 4 is configured to heat the medium M to quickly dry and fix the ink on the medium M, preventing bleeding and blurring and improving image quality. The heating unit 4 has a preheater unit 41 that preheats the medium M upstream in the transport direction F from the position where the recording unit 3 is provided, a platen heater unit 42 that heats the medium M at a position opposite the recording unit 3, and an afterheater unit 43 that heats the medium M downstream in the transport direction F from the position where the recording unit 3 is provided.

[0018] The pre-heater section 41 has a heater 41a, and is configured to gradually raise the temperature of the medium M from room temperature to a target temperature (the temperature at the platen heater section 42), thereby swiftly promoting drying of the ink from the time of landing. The platen heater section 42 has a heater 42a and an infrared heater 42b, and is configured to allow the medium M to receive the ink landing while maintaining the target temperature, thereby swiftly promoting drying of the ink from the time of landing. The after-heater section 43 has a heater 43a, and is configured to raise the temperature of the medium M to a temperature higher than the target temperature, swiftly drying any ink that has landed on the medium M that has not yet dried, and completely dry and fix the landed ink on the medium M at least before it is taken up by the roll 22.

[0019] 2, a support member 35 having a support surface 36 that supports the medium M being transported is provided at a position facing the carriage 32 on which the head 31 is mounted. The support member 35 is a flat metal plate, and is provided extending in a width direction that intersects with the transport direction F of the medium M. In order to support the medium M across the width direction, the support member 35 has a width larger than the width of the medium M, more specifically, a width larger than 64 inches.

[0020] The carriage 32 on which the head 31 is mounted engages with two guide shafts 33, 34 and is configured to be movable along the guide shafts 33, 34 in a width direction intersecting with the transport direction F of the medium M. The two guide shafts 33, 34 are provided on the rear side of the carriage 32, extending in the Z-axis direction and in the width direction. In the width direction, the dimensions of the guide shafts 33, 34 are longer than the dimensions of the support member 35. That is, the guide shafts 33, 34 extend beyond both ends of the support member 35 in the width direction. Therefore, the head 31 is configured to be able to move to an area other than the area facing the support surface 36. The two guide shafts 33, 34 are supported by a guide frame 38.

[0021] A maintenance unit 60 for maintaining the head 31 is provided on the movement path of the head 31. The maintenance unit 60 is disposed adjacent to the support member 35 in the width direction. The maintenance unit 60 in this embodiment has a flushing box 61, a cap member (not shown), and the like. The flushing box 61 receives ink that has been preliminarily ejected from the head 31 in order to adjust the meniscus.

[0022] The capping member keeps the nozzles of the head 31 moist during standby and cleans them by sucking ink from the nozzles. The capping member is open on the upper side facing the head 31, and a rubber member that acts as a seal is provided on the edge of the opening. The capping member is configured to be able to come into contact with the nozzle surface 31a so as to surround the nozzles of the head 31. The capping member is also configured to be able to move in the height direction by a lifting device (not shown).

[0023] The above-mentioned maintenance unit 60 is supported by a main body frame 100. The main body frame 100 functions as a base for mounting parts and is provided extending in the width direction. As shown in FIG. 1, the main body frame 100 has a substantially box-shaped cross section when viewed in the width direction, and a plurality of reinforcing ribs 101 are provided inside to prevent bending due to its own weight. The main body frame 100 is assembled by, for example, laser beam welding. The main body frame 100 of this embodiment is assembled by, for example, laser beam welding at a plurality of locations, but spot welding or other welding may also be used. The main body frame 100 is subject to twisting and distortion due to thermal contraction during welding.

[0024] The printing device 1 of this embodiment is provided with side frames 10 as frame members at both ends of a support member 35 extending in the X-axis direction. The side frames 10 extend along a second direction opposite to a first direction in which ink is ejected from the nozzles, and support the transport roller 23. The side frames 10 are attached to a main frame 100.

[0025] In this embodiment, the guide shafts 33, 34, support member 35, and other elements constituting the printing device 1 are assembled with respect to the transport roller 23. Specifically, the transport roller 23 is set as a reference (origin) for measuring the tolerance of each element. The side frame 10 directly or indirectly supports the transport roller 23 at a position closest to the other elements, thereby suppressing the influence of the tolerance in the height direction of the side frame 10. For example, the guide frame 38 is supported by the side frame 10, which is less influenced by the tolerance in the height direction. Therefore, when the carriage 32 that can move back and forth is installed on the guide shafts 33, 34, the position of the carriage 32 in the height direction is also likely to be within the desired accuracy. In the following, the side frame 10, which is less influenced by the tolerance in the height direction, will be described as a reference member when assembling the printing device 1.

[0026] In this embodiment, the height direction position of the head 31 mounted on the carriage 32 is determined with the side frame 10 as a reference, and the height direction position of the nozzle surface 31a is adjusted with high precision with respect to the side frame 10. Also, in this embodiment, the plate member 50 serving as an attachment part for attaching the maintenance unit 60, which requires positional precision, is inserted into the side frame 10, which serves as the reference for assembly. This allows the position of the plate member 50 in the height direction to be set as the reference position in the height direction. Thereafter, the position adjustment unit 70, as described above, finely adjusts the position of the plate member 50 inserted into the side frame 10 in the first direction or the second direction, thereby adjusting the flatness of the plate member and providing the positional precision of the plate member 50 with respect to the head 31 (nozzle surface 31a).

[0027] Fig. 3 is a perspective view showing the position adjustment unit 70. Fig. 4 is a plan view showing the position adjustment unit 70. Fig. 5 is a perspective view showing the plate member 50. Fig. 6 is a perspective view showing the side frame 10 with the plate member 50 removed and the position adjustment unit 70. Fig. 7 is a schematic side view of the protruding portion 53 of the plate member 50 and the opening 11 of the side frame 10 as viewed from the -X axis direction. Fig. 8 is a perspective view showing the screw fixing portion 55.

[0028] The printing device 1 of this embodiment is configured to adjust the plate member 50 using a side frame 10 that is a reference for assembly, a plate member 50 to which a maintenance unit 60 is attached, and a position adjustment unit 70 that can adjust the position of the plate member 50 in the Z-axis direction. Adjusting the position of the plate member 50 in the Z-axis direction will hereinafter be referred to as height adjustment. As shown in FIG. 3, the printing device 1 of this embodiment includes a height adjustment unit 72 as the position adjustment unit 70 that adjusts the height of the plate member 50. In this embodiment, two height adjustment units 72 are provided, and the position of the plate member 50 is adjusted at two locations corresponding to the locations where the two height adjustment units 72 are provided.

[0029] As shown in Figs. 3 to 5, the plate member 50 has a substantially rectangular shape in plan view from the +Z-axis direction. The rectangular plate member 50 has side walls 51 extending downward, improving the rigidity of the plate member 50. Each side wall 51 is bent downward from each end of the plate member 50, which is the edge of the plate member 50. The plate member 50 is also provided with mounting holes 56 of various shapes. The maintenance unit 60 (flushing box 61, etc.) shown in Fig. 2 is attached using these mounting holes 56.

[0030] 3, 6, and 7, the side frame 10 is provided with a plurality of openings 11 into which the plate member 50 is inserted so as to serve as a height reference when adjusting the height of the plate member 50. In this embodiment, three openings 11 are provided. The three openings 11 are referred to as a first opening 111, a second opening 112, and a third opening 113 in order from the +Y-axis direction.

[0031] As shown in Figs. 3 and 7, three protrusions 53 for insertion into the three openings 11 protrude from the end of the substantially rectangular plate member 50 on the side frame 10 side toward the side frame 10. The three protrusions 53 have a substantially rectangular shape in a plan view from the +Z axis direction. The protrusion 53 inserted into the first opening 111 is referred to as a first protrusion 531. The protrusion 53 inserted into the second opening 112 is referred to as a second protrusion 532. The protrusion 53 inserted into the third opening 113 is referred to as a third protrusion 533.

[0032] As shown in Fig. 7, each of the three openings 11 of the side frame 10 has an inner peripheral wall 11A formed in a rectangular shape when viewed from the side in the -X axis direction. Each of the three openings 11 has a protrusion 12 that protrudes upward (in the +Z axis direction) from the lower inner peripheral wall 11A and abuts against the inserted protrusion 53 from the downward direction (in the -Z axis direction). Here, the protrusion 12 provided in the first opening 111 is referred to as a first lower protrusion 121. The protrusion 12 provided in the second opening 112 is referred to as a second lower protrusion 122. The protrusion 12 provided in the third opening 113 is referred to as a third lower protrusion 123.

[0033] 7, in this embodiment, protrusions 13 are provided facing protrusion 12 with a slight offset therebetween, protruding downward (−Z axis direction) from upper inner circumferential wall 11A, and approaching protruding portion 53 inserted from above (+Z axis direction). Here, protrusion 13 provided in first opening 111 is referred to as first upper protrusion 131. Protrusion 13 provided in second opening 112 is referred to as second upper protrusion 132. Protrusion 13 provided in third opening 113 is referred to as third upper protrusion 133.

[0034] By configuring the three openings 11 as described above, when the protrusion 53 of the plate member 50 is inserted into the opening 11, it is inserted in a state where it is sandwiched between the downward protrusion 12 and the upward protrusion 13.

[0035] 7, the dimension of opening 11 in the Y-axis direction, which is an example of a cross direction intersecting with the second direction (upward direction), is defined as width dimension A. Furthermore, the dimension of protrusions 12 and 13 in the Y-axis direction, which is an example of a cross direction intersecting with the second direction (upward direction), is defined as width dimension B. Furthermore, the dimension of protrusion 53 in the Y-axis direction, which is an example of a cross direction intersecting with the second direction (upward direction), is defined as width dimension C.

[0036] In this embodiment, the width dimension C of the protruding portion 53 is smaller than the width dimension A of the opening 11. In addition, the width dimension B of the projections 12 and 13 is smaller than the width dimension C of the protruding portion 53.

[0037] When the protrusions 53 are inserted into the corresponding openings 11, in this embodiment, the area of ​​the lower protrusion 12 that contacts the protrusion 53 is reduced so that the contact is not line contact but approximate point contact. As a result, for example, by reducing the area of ​​the contact surface of the first lower protrusion 121 that contacts the first protrusion 531 from below, it is possible to simplify the cross management of the area that affects the height adjustment. Specifically, the higher the parallelism of the contact surface between the first protrusion 531 and the first lower protrusion 121 to the horizontal plane, the higher the positional accuracy of the plate member 50 in the height direction relative to the side frame 10. However, generally, the larger the area of ​​the contact surface, the more complicated the tolerance management of the contact surface becomes. This is because the tolerance needs to be managed at each of the multiple locations that constitute the contact surface, and the larger the area of ​​the contact surface, the more the number of locations where the tolerance needs to be managed increases. In contrast, in this embodiment, the area of ​​the lower protrusion 12 that contacts the protrusion 53 is reduced, thereby suppressing the tolerance management from becoming complicated. The same applies to the second protruding portion 532 and the second lower protrusion 122 that abuts against it from below, and the same applies to the third protruding portion 533 and the third lower protrusion 123 that abuts against it from below.

[0038] 6, the side frame 10 has screw holes 115 for screwing the plate member 50 to the side frame 10 after the height of the plate member 50 is adjusted by the height adjustment unit 72. Opposite the screw holes 115, the end of the plate member 50 on the side frame 10 side has a screw fixing portion 55 that bends upward and extends as a fixing portion, as shown in FIGS. 3, 5 and 8. The screw fixing portion 55 fixes the plate member 50 to the side frame 10.

[0039] In this embodiment, two screw fixing parts 55 are provided. As shown in FIG. 3, FIG. 5, and FIG. 8, the two screw fixing parts 55 are designated as a first screw fixing part 551 and a second screw fixing part 552 in order from the +Y-axis direction. The two screw fixing parts 55 are provided between the first protruding part 531, the second protruding part 532, and the third protruding part 533, one each. In detail, as shown in FIG. 3 and FIG. 5, the first screw fixing part 551 is provided between the first protruding part 531 and the second protruding part 532. Also, the second screw fixing part 552 is provided between the second protruding part 532 and the third protruding part 533. Also, each screw fixing part 55 has a through hole 555 through which the screw S is inserted from the right direction.

[0040] When the plate member 50 is fixed to the side frame 10 with a screw, the screw S is inserted into the through hole 555 from the -X-axis direction and screwed into the corresponding screw hole 115 of the side frame 10. More specifically, the screw hole 115 provided in the side frame 10 has been subjected to burring processing, and the screw S is a so-called tapping screw, which is screwed into the screw hole 115.

[0041] FIG. 9 is a cross-sectional view of the height adjustment unit 72. As shown in FIG. The main body frame 100 is provided with height adjustment units 72 as position adjustment units 70, as shown in Fig. 3, Fig. 4, Fig. 6, and Fig. 9. In this embodiment, two height adjustment units 72 are installed side by side in the Y-axis direction facing the lower side of the end of the plate member 50 in the -X-axis direction. In other words, the two height adjustment units 72 are located upstream and downstream in the conveying direction F. The height adjustment units 72 have a screw member 73 and a screwdriver jig 75.

[0042] 9, the screw member 73 has a bolt 731, a fixing nut 732, an adjustment nut 733, and a post-adjustment fixing nut 734. The bolt 731 is provided on the main body frame 100 with its screw tip protruding upward. The fixing nut 732 is provided to tighten the main body frame 100 between the head of the bolt 731 and the fixing nut 732, thereby fixing the bolt 731 to the main body frame 100. Note that instead of the fixing nut 732, a configuration may be adopted in which the main body frame 100 is burred to form a screw, and the bolt 731 is fixed to the main body frame 100.

[0043] Here, when the portion of the plate member 50 to which the maintenance unit 60 is attached is defined as the upper portion, and the portion opposite to the upper portion in the second direction is defined as the lower portion, the adjustment nut 733 is provided to support the plate member 50 by abutting against the lower portion, and has an outer shape that can be engaged with the back side, which is the lower portion of the plate member 50. The adjustment nut 733 is screwed into the shaft portion of the bolt 731, and is configured to be movable in the height direction by rotation. The post-adjustment fixing nut 734 is attached from the screw tip of the bolt 731 after adjustment by the adjustment nut 733. The post-adjustment fixing nut 734 is configured to tighten the plate member 50 between the adjustment nut 733 and the post-adjustment fixing nut 734, and to fix the plate member 50 whose position has been adjusted.

[0044] The screwdriving jig 75 has an engagement groove 751 that engages with the adjusting nut 733 in the rotational direction. The engagement groove 751 in this embodiment has a hexagonal shape in a plan view that is similar to that of the adjusting nut 733. For this reason, when the screwdriving jig 75 is rotated around the axis of the bolt 731, the adjusting nut 733 that engages with the engagement groove 751 in the rotational direction can be rotated integrally with the screwdriving jig 75.

[0045] 3 and 4, the screw driving jig 75 has a flange portion 752 at least a part of which protrudes from the end of the plate member 50 in the -X axis direction in plan view from the +Z axis direction which is the second direction. The flange portion 752 in this embodiment has a ring shape, and a part of it protrudes from the end of the plate member 50. Therefore, by operating the flange portion 752 protruding from the end of the plate member 50, the worker can rotate the adjustment nut 733 without accessing the back side of the plate member 50.

[0046] As shown in FIG. 6 and FIG. 9, the flange portion 752 has a plurality of holes 753 provided at a predetermined interval in the rotation direction. The holes 753 have a diameter through which the bolts 754 can be inserted. The bolts 754 are provided to screw the screwdriver jig 75 to the main body frame 100. In this embodiment, a total of 12 holes 753 are formed at intervals of 30° around the rotation axis. Furthermore, each of the holes 753 is assigned a number (not shown). Therefore, the worker can measure the number of rotations of the adjustment nut 733 by viewing the plurality of holes 753 as a dial scale. Furthermore, the worker can fine-tune the rotation angle of the adjustment nut 733 at intervals of 30° by viewing the plurality of holes 753 as a dial scale.

[0047] In this embodiment, the height position adjustment is performed by using the side frame 10, which serves as the reference for assembly, as a reference, inserting the three protrusions 53 of the plate member 50 into the three openings 11 of the side frame 10, and positioning the height adjustment parts 72 at two points as shown in Figures 3, 4, and 6, thereby adjusting the height position of the plate member 50 (maintenance unit 60) relative to the side frame 10 (nozzle surface 31a) at two points.

[0048] As described above, in adjusting the position in the height direction, the protrusion 53 of the plate member 50 is inserted into the opening 11 of the side frame 10, which serves as a reference, and thereby the height of the plate member 50 on the side frame 10 side (+X axis direction) is adjusted. In this state, the position in the height direction in the region near the end of the plate member 50 in the -X axis direction is adjusted by each of the two height adjustment units 72 installed opposite the end of the plate member 50 in the -X axis direction, which is the side facing the end of the plate member 50 on the side frame 10 side.

[0049] When attaching the maintenance unit 60 to the plate member 50, the maintenance unit 60 is attached after adjusting its position relative to the nozzle surface 31a using the protrusion 53 of the plate member 50, the opening 11 of the side frame 10, and the height adjustment portion 72.

[0050] 10 is a flowchart showing a position adjustment method, specifically, when adjusting the position of the plate member 50, in other words, when adjusting the position of the maintenance unit 60. Hereinafter, a position adjustment method for adjusting the position of the plate member 50 (adjusting the position of the maintenance unit 60) will be described with reference to FIG.

[0051] First, an insertion step (step S100) is performed. Specifically, the protruding portions 53 of the plate member 50 are inserted into the openings 11 of the side frame 10. As described above, the three protruding portions 53 of the plate member 50 are inserted into the three openings 11 of the side frame 10, respectively. Next, a temporary fixing step (step S101) is performed. In detail, after the protruding portions 53 of the plate member 50 are inserted into the openings 11 of the side frame 10, the plate member 50 is temporarily fixed to the side frame 10 using the screw fixing portions 55 of the plate member 50. As described above, the screws S are inserted into the through holes 555 of the two screw fixing portions 55 from the -X axis direction and screwed into the corresponding screw holes 115 provided in the side frame 10, thereby temporarily fixing the plate member 50. Next, a height adjustment step (step S102) is performed. In detail, the height of the periphery of the end portion in the −X-axis direction, which is the opposite direction to the protruding portion 53 of the plate member 50, is adjusted by using the height adjustment portion 72 as the position adjustment portion .

[0052] Here, a specific example of the height adjusting step (step S102) will be described. The height adjustment near the end of the plate member 50 in the -X-axis direction using the height adjustment part 72 is performed by rotating a flange part 752 of a screw driving jig 75 protruding from the end of the plate member 50 in the -X-axis direction in a plan view from the +Z-axis direction, as shown in Fig. 4. By rotating the flange part 752, the adjustment nut 733 engaged with the engagement groove 751 can be rotated, as shown in Fig. 9. When the adjustment nut 733 rotates, the plate member 50 supported by the adjustment nut 733 moves in the first direction or the second direction. Therefore, the operator can easily adjust the height of the plate member 50 without accessing the back side of the plate member 50.

[0053] When viewed from above in the +Z-axis direction, if the flange portion 752 is rotated counterclockwise, the plate member 50 moves in the second direction (upward). Conversely, if the flange portion 752 is rotated clockwise, the plate member 50 moves in the first direction (downward). At this time, the plate member 50 does not have to move completely along the upward or downward direction. For example, the plate member 50 may rotate around the end of the plate member 50 in the +X direction as the center of rotation. That is, the movement of the plate member 50 accompanying the height adjustment may be a translational movement or a rotational movement.

[0054] The flange portion 752 is provided with a plurality of holes 753 arranged at a predetermined interval in the rotation direction. Therefore, the worker can finely adjust the number of rotations and the rotation angle of the screw member 73 by using the holes 753 as a scale. When the flange portion 752 is operated to adjust the height to a predetermined position, a bolt 754 is inserted into one of the plurality of holes 753 to fix the screw driving jig 75 to the main body frame 100. This series of operations makes it possible to restrict the rotation of the adjustment nut 733 after adjustment. Then, after the screw driving jig 75 is fixed, the post-adjustment fixing nut 734 is attached and the plate member 50 is sandwiched and fixed.

[0055] When the height adjustment step (step S102) is completed, a permanent fixing step (step S103) is performed next. In detail, the state where the screw fixing parts 55 are temporarily fixed to the side frame 10 is shifted to a state where the screw fixing parts 55 are permanently fixed to the side frame 10. Specifically, in the temporary fixing step (step S101), the screws S are inserted into the through holes 555 of the two screw fixing parts 55, and the screws S are temporarily fixed by being screwed into the screw holes 115 of the side frame 10, and the screws S are further screwed into the screw holes 115 to fix the screw fixing parts 55 to the side frame 10.

[0056] Next, a maintenance unit mounting step (step S104) is performed. In detail, the maintenance unit 60, which is a flushing box 61 in this embodiment, is mounted on the upper surface 50a of the plate member 50 whose height has been adjusted, using various mounting holes 56. By the above adjustment method, the position of the plate member 50 (the position of the maintenance unit 60) can be adjusted.

[0057] According to the above adjustment method, by performing the insertion step (step S100), the protrusion 53 of the plate member 50 is inserted into the opening 11 of the side frame 10, which serves as the assembly reference and ensures dimensional accuracy, and the region of the plate member 50 on the side frame 10 side can be set as the reference position in the height direction. After that, the position adjustment unit 70 finely adjusts the height direction of the end region of the plate member 50 in the opposite direction (-X axis direction) from the side frame 10 side, thereby adjusting the height and flatness of the plate member 50. Thus, it is possible to prevent the flushing box 61 from being displaced relative to the nozzle surface 31a, and to appropriately receive ink that has been preliminarily ejected from the head 31, etc.

[0058] Moreover, the positions of one height adjustment section 72 and the third protrusion 533 installed upstream in the conveying direction F are arranged upstream of the flushing box 61 in the conveying direction. Therefore, height adjustment can be performed based on the upstream of the flushing box 61 in the conveying direction. Furthermore, the positions of one height adjustment section 72 and the first protrusion 531 installed downstream in the conveying direction F are arranged downstream of the flushing box 61 in the conveying direction. Therefore, height adjustment can be performed based on the upstream and downstream of the flushing box 61 in the conveying direction.

[0059] Furthermore, when viewed in a plane from the +Z axis direction of the plate member 50, the area of ​​the plate member 50 surrounded by the protrusion 53 and the two height adjustment parts 72 includes the area directly below the carriage 32 carrying the head 31, so the required position of the maintenance unit 60 can be adjusted with high precision.

[0060] According to this embodiment, the following effects can be obtained.

[0061] The printing device 1 of this embodiment includes a transport roller 23 that transports a medium M, a head 31 having a nozzle surface 31a with a plurality of nozzles that eject liquid (ink) onto the medium M, and a maintenance unit 60. The printing device 1 also includes a frame member (side frame 10) that extends along a second direction opposite to a first direction in which ink is ejected from the nozzles and supports the transport roller 23, a mounting portion (plate member 50) to which the maintenance unit 60 is attached, and a position adjustment portion 70 (height adjustment portion 72) that can adjust the position of the plate member 50 in the first direction or the second direction. The plate member 50 is provided with a protrusion 53 that is inserted into an opening 11 formed in the side frame 10. With this configuration, the nozzle surface 31a is positioned with reference to the side frame 10, which serves as a reference when assembling the device. The side frame 10 supports the transport roller 23, and the plate member 50 is positioned by inserting the protruding portion 53 into the opening 11 of the side frame 10. In other words, both the nozzle surface 31a and the plate member 50 are positioned with reference to the same side frame 10. Therefore, the opening 11 of the side frame 10 is ensured with positional accuracy relative to the nozzle surface 31a to such an extent that position adjustment is not required, and the protruding portion 53 of the plate member 50 can be inserted into the opening 11 to form a height reference. This simplifies and facilitates the operator's work of adjusting the height of the plate member 50, and the time required for the adjustment work can be shortened.

[0062] In the printing device 1 of this embodiment, when the portion of the plate member 50 to which the maintenance unit 60 is attached is defined as the upper portion and the portion opposite the upper portion in the second direction is defined as the lower portion, the position adjustment portion 70 (height adjustment portion 72) has a screw member 73 having an adjustment nut 733 that supports the plate member 50 by abutting against the lower portion of the plate member 50. In addition, the height adjustment portion 72 has a screw driving jig 75 having an engagement portion (engagement groove 751) that engages with the adjustment nut 733 and a flange portion 752 that partially protrudes from the edge (end portion) of the plate member 50 in a plan view from the second direction. With this configuration, an operator can rotate the adjustment nut 733 by manipulating the flange portion 752 protruding from the end of the plate member 50 without accessing the back side, which is the lower part of the plate member 50, thereby easily adjusting the height of the maintenance unit 60.

[0063] In the printing device 1 of this embodiment, the flange portion 752 has a plurality of holes 753 provided at predetermined intervals in the rotational direction. With this configuration, the worker can view the multiple holes 753 as a dial scale, and can measure the number of rotations of the adjustment nut 733 and fine-tune the rotation angle of the adjustment nut 733. After adjustment, the worker can fix the screwdriver jig 75 at any position using one of the multiple holes 753, thereby restricting the rotation of the screw member 73.

[0064] In the printing device 1 of this embodiment, the side frame 10 is provided with a protrusion 12 that protrudes upward in the second direction from the inner peripheral wall 11A of the opening 11 and abuts against the protruding portion 53 from below in the second direction. The dimension (width dimension B) of the protrusion 12 in a direction intersecting the second direction is smaller than the dimension (width dimension C) of the protruding portion 53 in the intersecting direction. According to this configuration, by providing a protrusion 12 with a width dimension B that is smaller than the width dimension C of the protrusion 53, the area of ​​the protrusion 12 that comes into contact with the protrusion 53 is reduced, making it easier to manage tolerances and therefore easier to ensure the flatness of the plate member 50.

[0065] In the printing device 1 of this embodiment, the protruding portion 53 has a first protruding portion 531 and a second protruding portion 532. The plate member 50 has a screw fixing portion 55 (first screw fixing portion 551) between the first protruding portion 531 and the second protruding portion 532 as a fixing portion for fixing the plate member 50 to the side frame 10. In this embodiment, the protruding portion 53 also has a third protruding portion 533, and has a second screw fixing portion 552 between the second protruding portion 532 and the third protruding portion 533. According to this configuration, by arranging the screw fixing portion 55 (first screw fixing portion 551) between the first protruding portion 531 and the second protruding portion 532, it is possible to suppress rotation of the plate member 50 when the first screw fixing portion 551 is screwed, and it is possible to suppress fluctuation in the position of the plate member 50. Furthermore, by arranging the second screw fixing portion 552 between the second protruding portion 532 and the third protruding portion 533, it is possible to further suppress rotation of the plate member 50. As a result, when the screw S is turned to screw the second screw fixing portion 552 after the first screw fixing portion 551 is screwed, it is possible to suppress deformation of the plate member 50 due to the plate member 50 rotating in the same direction as the rotation direction of the screw S.

[0066] In the position adjustment method of the maintenance unit 60 of this embodiment, the printing device 1 includes a transport roller 23, a head 31 having a nozzle surface 31a, a maintenance unit 60, and a side frame 10 extending along a second direction opposite to a first direction in which liquid is ejected from the nozzles and supporting the transport roller 23. The printing device 1 also includes a plate member 50 and a height adjustment unit 72 capable of adjusting the position of the plate member 50 in the first direction or the second direction. The position adjustment method includes a step of inserting a protrusion 53 disposed on the plate member 50 into an opening 11 opened in the side frame 10 (insertion step: step S100), and a step of adjusting the position of the plate member in the first direction or the second direction by the height adjustment unit 72 after inserting the protrusion 53 into the opening 11 (height adjustment step: step S102). According to this adjustment method, first, in an insertion step (step S100), a height reference is formed by inserting the protrusion 53 of the plate member 50 into the opening 11 of the side frame 10, where the positional accuracy with respect to the nozzle surface 31a is ensured to the extent that position adjustment is not necessary. Next, in a height adjustment step (step S102), the position of the plate member 50 in the first direction or the second direction is adjusted using the height adjustment unit 72. This position adjustment method makes it easier for the worker to perform the adjustment work, and can shorten the time required for the adjustment work.

[0067] 2. Second embodiment FIG. 11 is a schematic perspective view showing the position adjustment unit 90 in the second embodiment. FIG. 12 is a schematic cross-sectional view showing the position adjustment unit 90. FIG. 12 is a cross-sectional view of the state in which the rotation shaft 921 shown in FIG. 11 is cut in the YZ plane with the axis as the center. FIG. 13 is a schematic cross-sectional view showing the height adjustment by the cam 922. FIG. 13 is a cross-sectional view of the state in which the cam 922 is cut in the XZ plane, and shows the state of the lowest position and the highest position in the Z-axis direction of the plate member 50A when adjusted. The plate member 50A is configured in substantially the same manner as the plate member 50 in the first embodiment that fixes the maintenance unit 60, and has the same function.

[0068] Specifically, the position adjustment unit 90 of this embodiment includes a height adjustment unit 92 and a fixed frame 200. The height adjustment unit 92 includes a rotating shaft 921, a cam 922, and an operation unit 923. The height adjustment unit 92 also includes a fixing nut 924 and a post-adjustment fixing nut 925.

[0069] Here, the portion of the plate member 50A to which the maintenance unit 60 is attached is defined as the upper portion, and the portion opposite to the upper portion in the second direction is defined as the lower portion. The rotating shaft 921 extends in a direction intersecting with the second direction. In detail, the rotating shaft 921 extends in the Y-axis direction and is rotatable about the Y-axis direction. The cam 922 is disposed rotatably together with the rotating shaft 921, and supports the plate member 50A by abutting against the lower portion. The operating part 923 is disposed so as to cover one end of the rotating shaft 921 in the axial direction, and is provided to rotate the rotating shaft 921.

[0070] The fixed frame 200 is a plate-like member that rotatably holds the height adjustment unit 92. The fixed frame 200 extends in the width direction and is L-shaped when viewed from the side from the -X-axis direction. In this embodiment, a pair of fixed frames 200 is provided. The pair of fixed frames 200 are installed so as to sandwich the plate member 50A from the +Y-axis direction and the -Y-axis direction. The fixed frames 200 are fixed to the main frame 100.

[0071] Two protrusions 210 formed similarly to and having a similar function as protrusion 53 of the first embodiment protrude in the +X-axis direction from an end portion that is an edge of fixing frame 200 in the +X-axis direction. In addition, one screw fixing portion 211 formed similarly to screw fixing portion 55 of the first embodiment and having a similar function is formed in the +X-axis direction between the two protrusions 210 from the end portion of fixing frame 200 in the +X-axis direction.

[0072] In this embodiment, the side frame 10A is configured in a manner similar to that of the side frame 10 of the first embodiment and has the same functions. The side frame 10A has two openings 15 in the +Y-axis direction and the -Y-axis direction in addition to the opening 11 in the first embodiment. The two fixing frames 200 installed in the Y-axis direction are assembled by inserting the protrusions 210 into the openings 15. This determines the reference position of the height adjustment unit 92. The plate member 50A is fixed to the side frame 10 by inserting the screws S into the through holes 212 of the screw fixing parts 211.

[0073] In addition, since the fixed frame 200 is connected to the side frame 10A, which ensures positional accuracy, the positional accuracy of the height adjustment unit 92 is also likely to fall within a desired range. Therefore, even with the height adjustment unit 92 of this embodiment, which adjusts all at once, rather than individually as in the height adjustment units 72 of the first embodiment, the flatness of the plate member 50A is likely to fall within a desired range.

[0074] Each of the pair of fixed frames 200 has an insertion hole 220 that rotatably supports the rotation shaft 921. The insertion hole 220 formed in one of the pair of fixed frames 200 faces the insertion hole 220 formed in the other. This allows the rotation shaft 921 to rotate, for example, around the Y-axis direction. The insertion hole 220 is located below the plate member 50A.

[0075] The cams 922 are disposed below the plate member 50A, one on each side of the rotation shaft 921. The rotation shaft 921 passes through the cams 922. The cams 922 rotate about the rotation shaft 921 in conjunction with the rotation of the rotation shaft 921. The cams 922 are disposed rotatably around the rotation shaft 921, and support the plate member 50A by abutting against the lower part of the plate member 50A.

[0076] The rotating shaft 921 is rotatably supported while its movement in the Y-axis direction is restricted by two fixing nuts 924 installed inside the two fixed frames 200. An operating unit 923 for rotating the rotating shaft 921 is disposed in a disk shape at one end in the axial direction of the rotating shaft 921 (in this embodiment, the end in the +Y-axis direction).

[0077] With this configuration, the dimension of the rotating shaft 921 in the axial direction is equal to or greater than the dimension of the upper part in the axial direction. In other words, the length of the rotating shaft 921 is equal to or greater than the length of the plate member 50A corresponding to the axial direction of the rotating shaft 921. The operating portion 923 protrudes from the edge (end portion) of the plate member 50A in a plan view from the second direction (+Z axis direction). Note that a post-adjustment fixing nut 925 movable in the rotation axis direction is screwed onto the rotating shaft 921 between the operating portion 923 and the fixed frame 200.

[0078] Here, the height adjustment by the height adjustment unit 92 will be described, focusing on the operation of the cam 922. The cams 922 are eccentric cams. The relationship between the rotation angle and the displacement of the cams 922 is linear. The displacement of the cams 922 is proportional to the rotation angle. The two cams 922 are disposed so as to have the same posture with respect to the rotation shaft 921.

[0079] The operator holds the operating portion 923 and rotates the rotating shaft 921 to adjust the height. When the operator rotates the rotating shaft 921, the cam 922 rotates in contact with the lower surface 50b of the plate member 50A, as shown in FIG. 13, to move the plate member 50A in the vertical direction. However, as with the plate member 50 of the first embodiment, the region on the end side in the +X-axis direction of the plate member 50A is initially positioned by inserting the protruding portion 53 into the opening 11 of the side frame 10A, which is the reference for assembly. Therefore, in detail, the rotation of the cam 922 moves (rotates) the end region of the plate member 50A corresponding to the -X-axis direction where the cam 922 is installed in the vertical direction with the upper surface 50a maintaining flatness, based on the end in the +X-axis direction.

[0080] 13, when the height of the plate member 50A is adjusted by rotating the cam 922, the position of the plate member 50A in the Z-axis direction is indicated by a solid line, and the position of the plate member 50A in the Z-axis direction is indicated by a two-dot chain line, and the position of the plate member 50A in the Z-axis direction is indicated by a two-dot chain line. By this adjustment, the height of the plate member 50A relative to the nozzle surface 31a of the head 31 is adjusted.

[0081] After adjusting the height, the worker moves the post-adjustment fixing nut 925 screwed onto the rotating shaft 921 toward the fixed frame 200 and tightens the fixed frame 200 between the fixing nut 924 and the rotating shaft 921 to fix the rotating shaft 921 to the fixed frame 200. Note that in this embodiment, two cams 922 are provided, but this is not limited thereto, and one cam or three or more cams may be provided. Also, the cam 922 may be molded integrally with the rotating shaft 921.

[0082] Here, the position adjustment method will be described with reference to the flowchart shown in FIG. The inserting step (step S100) and temporary fixing step (step S101) of the plate member 50A and the side frame 10A are the same as those in the first embodiment. In detail, inserting the protruding portion 53 of the plate member 50A into the opening 11 of the side frame 10A corresponds to the inserting step (step S100). Also, temporarily fixing the plate member 50A to the side frame 10A with the screw S using the screw fixing portion 55 of the plate member 50A (not shown in FIG. 11) corresponds to the temporary fixing step (step S101).

[0083] The height adjustment step (step S102) corresponds to operating (rotating) the operating portion 923 to rotate the cam 922. Note that after the adjustment, fixing the rotating shaft 921 to the fixed frame 200 with the post-adjustment fixing nut 925 is also included. Thereafter, as in the first embodiment, the screw fixing portion 55 is finally fixed to the side frame 10A, which corresponds to the final fixing step (step S103). The maintenance unit attachment step (step S104) is the same as in the first embodiment.

[0084] According to the present embodiment, in addition to the same effects as those of the first embodiment, the following effects can be obtained.

[0085] In the printing device 1 of this embodiment, the position adjustment section 90 (height adjustment section 92) has a rotating shaft 921, a cam 922, and an operating section 923. Here, the portion of the plate member 50A to which the maintenance unit 60 is attached is defined as the upper portion, and the portion opposite the upper portion in the second direction is defined as the lower portion. In this case, the cam 922 is disposed rotatably around the rotating shaft, and supports the plate member 50A by abutting against the lower portion of the plate member 50A. The operating section 923 is disposed at one end of the rotating shaft 921 in the axial direction, and rotates and operates the rotating shaft 921. The dimension of the rotating shaft 921 in the axial direction is equal to or greater than the dimension of the upper portion in the axial direction. With this configuration, the position of the plate member 50A in the first direction and the second direction can be adjusted by the rotation angle of the cam 922. Furthermore, for example, even when the size of the maintenance unit 60 and the plate member 50A increases due to an increase in size of the head 31, the height of the maintenance unit 60 can be adjusted without increasing the number of position adjustment parts 90.

[0086] In the printing device 1 of this embodiment, the dimension of the rotation shaft 921 in the axial direction is configured to be larger than the dimension of the upper part of the plate member 50A in the axial direction. The operation unit 923 protrudes from the edge (end portion) of the plate member 50A in a plan view from the second direction (+Z axis direction). With this configuration, an operator can rotate the rotating shaft 921 by operating the operating portion 923 protruding from the end of the plate member 50A without accessing the back side (lower surface 50b) of the plate member 50A, thereby easily adjusting the height of the maintenance unit 60.

[0087] 3. Variation 1 14 is a cross-sectional view illustrating Modification 1. In detail, FIG. 14 is a cross-sectional view illustrating a state in which protrusion 53 is inserted into opening 11.

[0088] In the first embodiment, the protruding portion 53 of the plate member 50 is inserted into the opening 11 of the side frame 10. Here, as shown in FIG. 14, the protruding portion 53 includes a base portion 53A and a tip portion 53B. The tip portion 53B is located on the opposite side of the plate member 50 (50A) to the base portion 53A in the protruding direction of the protruding portion 53. The protruding direction of the protruding portion 53 is, for example, the X-axis direction. In this case, the tip portion 53B may be bent downward as shown in FIG. 14 so that the dimension D of the tip portion 53B in the second direction is larger than the dimension of the base portion 53A in the second direction (in this case, the thickness E of the base portion 53A).

[0089] In this manner, by configuring dimension D of tip portion 53B to be larger than the dimension (thickness E) of base portion 53A, it is possible to prevent protrusion 53 from falling out of opening 11. Meanwhile, dimension D of tip portion 53B only needs to be equal to or larger than the gap dimension between protrusion 12 formed on inner circumferential wall 11A of opening 11 and protruding upward, and protrusion 13 protruding downward.

[0090] In this modification, the tip portion 53B does not only refer to the tip portion of the plate-shaped protruding portion 53, but also includes, for example, a state in which a member such as a cap is attached to the tip portion of the plate-shaped protruding portion 53. Therefore, by attaching a member such as a cap to the tip portion of the plate-shaped protruding portion 53 extending in the X-axis direction, the dimension of the tip portion may be configured to be larger than the dimension (thickness E) of the base portion 53A.

[0091] 4. Variation 2 The screw driving jig 75 having the flange portion 752 in the first embodiment protrudes partially from the end of the plate member 50, but depending on the shape of the end of the plate member 50, it may be configured so that multiple points protrude.

[0092] 5. Variation 3 In this embodiment, the protrusions 12 that abut against the three protrusions 53 from below in the second direction are provided on each of the three protrusions 53. However, it is sufficient that the protrusions 12 that abut against the three protrusions 53 from below in the second direction are provided on at least one protrusion 53.

[0093] 6. Variation 4 In this embodiment, the protrusion 53 has three protrusions 53: a first protrusion 531, a second protrusion 532, and a third protrusion 533, but it may also have a structure that has two protrusions 53 (a first protrusion 531 and a second protrusion 532) and has a screw fixing portion 55 between the two protrusions 53.

[0094] 7. Variation 5 The protrusion 53 of this embodiment is provided with three protrusions 53, namely, a first protrusion 531, a second protrusion 532, and a third protrusion 533, and performs the insertion process. However, the protrusion 53 may be provided with one protrusion 53, two protrusions 53, or four or more protrusions 53, and perform the insertion process.

[0095] 8. Variation 6 In this embodiment, the protruding portion 53 is integrally formed with the plate member 50 (50A). However, the protruding portion 53 may be a separate body from the plate member 50 (50A). For example, the plate member 50 (50A) may be made of stainless steel such as SUS, while the protruding portion 53 may be made of aluminum, and the protruding portion 53 may be welded or screwed to the plate member 50 (50A).

[0096] 9. Variation 7 The opening 11 in this embodiment includes three openings 11, namely, a first opening 111, a second opening 112, and a third opening 113, but a single opening 11 may be provided and three protrusions 53 may be inserted therein. In this case, it is preferable that protrusions 12 are provided that protrude upward (in the +Z-axis direction) from the inner peripheral wall 11A of one opening 11 and abut against the three inserted protrusions 53 from below (in the -Z-axis direction). Even in this configuration, the positional accuracy of the plate member 50 in the height direction relative to the side frame 10 is likely to fall within a desired range.

[0097] 10. Variation 8 In this embodiment, the plate member 50 is provided with three protrusions 53 that are inserted into the opening 11, but another protrusion may be provided on the plate member 50, and the other protrusion may be provided with the three protrusions 53. Even in this configuration, the positional accuracy of the plate member 50 in the height direction relative to the side frame 10 tends to fall within a desired range. [Explanation of symbols]

[0098] 1...printing device, 10, 10A...side frame constituting a frame member, 11...opening, 11A...inner peripheral wall, 12, 13...projection, 23...transport roller, 31...head, 31a...nozzle surface, 50, 50A...plate member constituting a mounting portion, 50a...upper surface, 53...projection, 53A...base, 53B...tip, 55...screw fixing portion constituting a fixing portion, 60...maintenance unit, 70...position adjustment portion, 72...height adjustment portion, 73...screw member, 75...screw driving jig, 90...position adjustment portion, 92...height adjustment portion, 121...first Lower protrusion, 122...second lower protrusion, 531...first protrusion, 532...second protrusion, 551...first screw fixing portion, 731...bolt, 732...fixing nut, 733...adjusting nut, 734...adjusted fixing nut, 751...engagement groove, 752...flange portion, 753...hole portion, 754...bolt, 921...rotating shaft, 922...cam, 923...operating portion, 924...fixing nut, 925...adjusted fixing nut, A...width dimension of opening, B...width dimension of protrusion, C...width dimension of protrusion, D...dimension of tip, E...thickness of base, M...medium, S...screw.

Claims

1. A transport roller for transporting the medium; a head having a nozzle surface provided with a plurality of nozzles for ejecting liquid onto the medium; a maintenance unit for performing maintenance on the head; When a direction including a first direction in which the liquid is ejected from the nozzle and a second direction opposite to the first direction is defined as a height direction, a frame member extending along the height direction and supporting the transport roller; a mounting portion to which the maintenance unit is attached; a position adjustment unit capable of adjusting a position of the mounting unit in the height direction; Equipped with The liquid ejection device according to claim 1, wherein the mounting portion is provided with at least one protrusion that is inserted into an opening formed in the frame member.

2. The liquid ejection device according to claim 1 , When a portion of the mounting portion to which the maintenance unit is attached is defined as an upper portion, and a portion opposite to the upper portion and disposed on the back side of the upper portion in the first orientation is defined as a lower portion, The position adjustment unit is a screw member having an adjustment nut that supports the mounting portion by contacting the lower portion of the mounting portion; a screwdriver jig including an engagement portion that engages with the adjustment nut and a flange portion at least a part of which protrudes from an edge of the mounting portion in a plan view from the height direction; A liquid ejection device comprising:

3. The liquid ejection device according to claim 2, The liquid ejection device according to claim 1, wherein the flange portion has a plurality of holes provided at predetermined intervals in a rotational direction.

4. The liquid ejection device according to claim 1 , When a portion of the mounting portion to which the maintenance unit is attached is defined as an upper portion, and a portion opposite to the upper portion and disposed on the back side of the upper portion in the first orientation is defined as a lower portion, The position adjustment unit is A rotation axis extending in a direction intersecting the height direction; a cam that is rotatably disposed about the rotation axis and supports the mounting portion by contacting the lower portion; an operating portion disposed at one end of the rotating shaft in an axial direction for rotating the rotating shaft; having A liquid ejection device, wherein a dimension of the rotation shaft in the axial direction is equal to or greater than a dimension of the upper portion in the axial direction.

5. The liquid ejection device according to claim 4, a dimension of the rotation shaft in the axial direction is greater than a dimension of the upper portion in the axial direction; The liquid ejection device according to claim 1, wherein the operation portion protrudes from an edge of the attachment portion when viewed from above in the height direction.

6. The liquid ejection device according to any one of claims 1 to 5, a protrusion is disposed on the frame member, the protrusion protruding from an inner peripheral wall of the opening toward a rear side in the second direction and abutting against at least one of the protruding portions from a front side in the second direction; A liquid ejection device, wherein a dimension of the protrusion in a direction intersecting the height direction is smaller than a dimension of the opening in the intersecting direction.

7. The liquid ejection device according to any one of claims 1 to 6, At least one of the projections has a base and a tip; A liquid ejection device, wherein a dimension of the tip portion in the height direction is greater than a dimension of the base portion in the height direction.

8. The liquid ejection device according to any one of claims 1 to 7, At least one of the protrusions includes a first protrusion and a second protrusion, The liquid ejection device according to claim 1, wherein the mounting portion has a fixing portion between the first protrusion and the second protrusion for fixing the mounting portion to the frame member.

9. A transport roller that transports the medium in a transport direction; a head having a nozzle surface provided with a plurality of nozzles for ejecting liquid onto the medium; a maintenance unit for performing maintenance on the head; When a direction including a first direction in which the liquid is ejected from the nozzle and a second direction opposite to the first direction is defined as a height direction, a frame member extending along the height direction and supporting the transport roller; a mounting portion to which the maintenance unit is attached; a position adjustment unit capable of adjusting a position of the mounting portion in the height direction; A method for adjusting the position of a maintenance unit of a liquid ejection device, comprising: inserting at least one protrusion disposed on the mounting portion into an opening formed in the frame member; After inserting at least one of the protrusions into the opening, adjusting the position of the mounting portion in the height direction by the position adjustment portion; 13. A method for adjusting a position of a maintenance unit, comprising:

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