JP2018183977A - Liquid discharge device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid discharge device which can easily adjust inclination of a head holder with high accuracy on an actual machine.SOLUTION: A liquid discharge device includes: one or multiple liquid discharge heads each having multiple nozzles for discharging droplets; a head holder which holds the one or multiple liquid discharge heads; a sub carriage which holds the head holder; and a carriage which holds the sub carriage and may move in a main scanning direction. A reference member extending along the main scanning direction is provided at the carriage, and the sub carriage is supported by the reference member and positioned by the carriage. The head holder and the sub carriage are provided with: rotary reference members for rotating the head holder around the main scanning direction relative to the sub carriage; shaft holes rotatably supporting the rotary reference members; and angle adjustment parts which restrict rotation of the head holder relative to the sub carriage and adjust a rotation angle.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a liquid ejection apparatus.

  As an image forming apparatus such as a printer, a facsimile, a copying apparatus, a plotter, and a complex machine of these, for example, a liquid discharge recording type image forming apparatus (inkjet) that uses a liquid discharge head (droplet discharge head) for discharging droplets as a recording head Recording devices, etc.) are known.

  When an image is formed in a liquid discharge recording type image forming apparatus, the landing accuracy of droplets discharged from nozzles greatly affects the image quality. Since the image quality deteriorates when the droplet landing accuracy is poor, it is necessary to position the recording head with high accuracy (see, for example, Patent Document 1).

  An object of the present invention is to provide a liquid ejection device that can easily and accurately adjust the inclination of a head holder on an actual machine.

  The above-described problems include a liquid discharge head having a plurality of nozzles for discharging liquid droplets, a head holder that holds one or a plurality of the liquid discharge heads, a sub-carriage that holds the head holder, and the sub-carriage And a carriage that is movable in the main scanning direction. The carriage is provided with a reference member that extends along the main scanning direction, and the sub-carriage is supported by the reference member and positioned on the carriage. A rotation reference member for rotating the head holder around the main scanning direction with respect to the sub-carriage in the head holder and the sub-carriage; and a shaft hole that rotatably supports the rotation reference member; An angle adjusting unit for restricting rotation of the head holder relative to the sub-carriage and adjusting a rotation angle; It is solved by in which the liquid discharge device.

  In the liquid ejection apparatus according to the present invention, the rotation of the head holder with respect to the sub-carriage is regulated by the angle adjusting unit, and the rotation angle can be adjusted. Therefore, the inclination of the head holder can be easily and highly accurately adjusted on the actual machine.

It is a typical perspective view which shows an example of the carriage of a liquid discharge apparatus. FIG. 5 is a schematic side view illustrating an example of a carriage of the liquid ejection device. 1 is a perspective view illustrating an overall configuration of a liquid ejection apparatus according to an embodiment of the present invention. It is a perspective view which shows the carriage scanning mechanism part which concerns on one Embodiment of this invention. It is a typical perspective view showing a carriage concerning one embodiment of the present invention. It is a typical front view showing a carriage concerning one embodiment of the present invention. It is a typical side view showing a carriage concerning one embodiment of the present invention. It is an enlarged side view of an adjustment screw part. It is a typical side view which shows the operation | movement of the carriage which concerns on one Embodiment of this invention, (a) is before adjustment, (b) shows the time of adjustment. It is a typical side view (modification) showing a carriage concerning one embodiment of the present invention. It is a typical perspective view which shows the carriage which concerns on another embodiment of this invention. It is a typical front view which shows the carriage which concerns on another embodiment of this invention. It is a perspective view which shows an example of an adjustment cam. It is a schematic diagram which shows the application example of an adjustment cam. It is a perspective view which shows an example of an adjustment wedge member. It is a schematic diagram which shows the application example of an adjustment wedge member. It is a typical side view which shows the carriage which concerns on another embodiment of this invention.

  Hereinafter, before describing the embodiment, a preliminary matter for facilitating understanding of the embodiment will be described.

  The present inventors are examining a liquid discharge apparatus that can adjust the inclination (parallelism between the head holder and the platen) of a head holder that holds a liquid discharge head (recording head) on an actual machine. As shown in FIG. 1, the liquid ejection apparatus includes a recording head 50 having a plurality of nozzles for ejecting liquid droplets, a head holder 52 that holds the recording head 50, a sub-carriage 54 that holds the head holder 52, And a carriage 56 that holds the sub-carriage 54 and is movable in the main scanning direction.

  The carriage 56 is provided with a reference shaft 58 extending along the main scanning direction, and the sub-carriage 54 is supported by the reference shaft 58 and positioned on the carriage 56. As shown in FIG. 2, the head holder 52 and the sub-carriage 54 are provided with a rotation shaft 60 of the head holder 52, a long hole 62 that supports the rotation shaft 60 so as to be rotatable and movable in the vertical direction, and the head holder. A fastening portion 64 for fixing 52 to the sub-carriage 54 is provided.

  Since it is configured in this manner, the head holder 52 can be rotated around the rotation shaft 60 and the inclination of the head holder 52 can be adjusted on the actual machine. The vertical position of the liquid ejection surface of the recording head 50 can also be adjusted by the shape of the long hole 62.

  However, in this liquid ejection apparatus, it is necessary to fix the head holder 52 to the sub-carriage 54 with the fastening portion 64 in a state where the head holder 52 is held at a target inclination (parallelism). This requires, for example, a device for holding the posture of the head holder 52 using a jig, and there is a problem that the work is not easy.

  In the following embodiments, a liquid ejection apparatus that can easily and accurately adjust the inclination of the head holder on a real machine will be described.

(Embodiment)
FIG. 3 is a perspective view showing the overall configuration of the liquid ejection apparatus according to one embodiment of the present invention, and FIG. 4 is a perspective view showing a carriage scanning mechanism section according to one embodiment of the present invention.

  As shown in FIG. 3, the liquid ejection apparatus is a serial type ink jet recording apparatus, and includes an apparatus main body 1 and a support base 2 that supports the apparatus main body 1. Inside the apparatus main body 1, guide rods 3 and guide stays 4, which are guide members, are spanned on both side plates, and the carriage 5 moves in the direction of arrow A (main scanning direction) on these guide rods 3 and guide stays 4. Supported as possible.

  On the carriage 5, a recording head 6 including a liquid ejection head that ejects ink droplets of each color of black (K), yellow (Y), magenta (M), and cyan (C) is mounted. Each recording head 6 includes a plurality of nozzles that eject droplets. Each recording head 6 is integrally provided with a head tank that supplies ink to each recording head 6.

  A main scanning mechanism unit 10 that moves and scans the carriage 5 is disposed on one side in the main scanning direction, a driving pulley 12 that is rotationally driven by the driving motor 11, and on the other side in the main scanning direction. A driven pulley 13 and a timing belt 14 that is a pulling member wound between the drive pulley 12 and the driven pulley 13. The driven pulley 13 is tensioned outward (in a direction away from the drive pulley 12) by a tension spring.

  In the main scanning area of the carriage 5, in the recording area, the paper 20 is intermittently conveyed by the suction conveyance unit in the arrow B direction (sub-scanning direction, paper conveyance direction) orthogonal to the main scanning direction of the carriage 5.

  A maintenance / recovery device 8 that performs maintenance / recovery of the recording head 6 is disposed in one end side region of the main scanning region. Further, a main cartridge 9 containing ink of each color to be supplied to the sub tank of the recording head 6 is located outside the carriage movement area in the main scanning direction or in the other end side area of the main scanning area. And is detachably mounted. In addition, roll paper (hereinafter referred to as “paper 20”) is set in the paper supply unit 21, but roll paper having a different size in the width direction can also be set.

  In the liquid ejection apparatus configured as described above, image formation is performed as follows. First, the sheet 20 conveyed from the sheet feeding unit 21 is conveyed from the rear side to the front side of the apparatus main body 1 to the recording area by the conveying unit. Next, by moving the carriage 5 in the main scanning direction and intermittently sending the paper 20 to the platen 7 by the suction conveyance unit, the recording head 6 is driven according to the image information to discharge droplets. A required image is formed on the paper 20. Then, the paper 20 after the image formation is cut to a predetermined length and discharged to a paper discharge tray arranged on the front side of the apparatus main body 1.

  Although the configuration in which the paper 20 is cut and discharged is described here, a configuration in which the paper after image formation without being cut is taken up by the paper discharge unit may be used.

  Next, the configuration of the carriage 5 of the liquid ejection apparatus, which is a characteristic part of the present invention, will be described in detail.

  FIG. 5 is a schematic perspective view showing a carriage according to an embodiment of the present invention. As shown in FIG. 5, a head holder 25 is held on the carriage 5 via a sub-carriage 18. Here, in order to make the direction easy to understand, an XYZ Cartesian coordinate system is used below. In FIG. 5, the X direction indicates the sub-scanning direction, and the Y direction indicates the main scanning direction.

  The head holder 25 is mounted with recording heads 6a, 6b, and 6c arranged in a staggered manner in the X direction (sub-scanning direction). When the recording heads are not individually distinguished, they are referred to as “recording head 6”. Further, the number of recording heads 6 mounted on the head holder 25 may be one, two, or more than three.

  The carriage 5 is provided with a reference shaft 15 as a reference member extending in the same direction as the guide rod 3 (Y direction: main scanning direction). A sub-carriage 18 is detachably and rotatably mounted on the reference shaft 15 via an adjustment member 35. Further, the sub-carriage 18 abuts on the carriage 5 in the rotation direction and is held (positioned).

  FIG. 6 is a schematic front view showing a carriage according to an embodiment of the present invention. As shown in FIG. 6, the adjustment member 35 is supported on the subcarriage 18 so as to be rotatable around a subcarriage rotation reference 37. That is, the adjustment member 35 can rotate around the X direction (sub-scanning direction). The sub-carriage rotation reference 37 has a pin shape and is configured to fix the adjustment member 35 by being inserted into the sub-carriage 18. Or it is good also as a structure fastened to the subcarriage 18 as a stepped screw.

  The sub-carriage 18 holds the head holder 25 by holding portions 18 a and 18 b along both ends of the head holder 25. Accordingly, the subcarriage 18 is detachably and rotatably mounted on the reference shaft 15 via the adjustment member 35, and the subcarriage 18 holds the head holder 25. Therefore, the head holder 25 also extends in the direction around the axis of the reference shaft 15. It is held rotatably.

  In this way, by providing the reference shaft 15 in the same direction (parallel) as the guide rod 3 of the carriage 5, the positional accuracy of the inclination of the recording head 6 in the sub-scanning direction, the height direction, the tilt direction, and the main scanning direction can be improved. It can be improved.

  Further, by rotating the adjustment member 35 around the sub-carriage rotation reference 37, the sub-carriage 18 is supported while being inclined with respect to the reference shaft 15. Therefore, the parallelism in the X direction (sub-scanning direction) between the recording head 6 and the platen 7 can be adjusted.

  FIG. 7 is a schematic side view showing a carriage according to an embodiment of the present invention. As shown in FIGS. 5 to 7, the head holder 25 is provided with rotation reference members 31 a and 31 b at both ends in the Y direction (main scanning direction). In addition, the holding portions 18a and 18b along both ends of the head holder 25 are provided with shaft holes 32a and 32b that rotatably support the rotation reference members 31a and 31b. Further, adjustment screws 33a and 33b, which are angle adjusting portions that restrict the rotation of the head holder 25 relative to the sub-carriage 18 and adjust the rotation angle, are provided at both ends in the Y direction (main scanning direction) of the head holder 25. ing. The rotation reference members 31 a and 31 b may be provided on the sub-carriage 18, and the shaft holes 32 a and 32 b may be provided on the head holder 25.

  As shown in an enlarged view in FIG. 8, the adjustment screws 33 a and 33 b have, for example, a screw thread portion that is rotatably supported by the head holder 25 and a screw tip that is rotatably supported by the holding portions 18 a and 18 b of the subcarriage 18. ing. Accordingly, the adjusting screws 33a and 33b regulate the rotation (around the main scanning direction) of the head holder 25 with respect to the sub-carriage 18. Further, the distance between the sub carriage 18 and the head holder 25 can be changed by screwing the adjusting screws 33a and 33b.

  FIG. 9 is a schematic side view showing the operation of the carriage according to the embodiment of the present invention, where (a) shows before adjustment and (b) shows during adjustment. For ease of understanding, some of the parts are omitted.

  As shown in FIG. 9, by adjusting the screwing amount of the adjusting screws 33a and 33b, the rotation angle of the head holder 25 with respect to the sub carriage 18 in the Z direction, that is, the nozzle surface of the recording head 6 and the Y direction of the platen 7 ( Parallelism around (main scanning direction) can be adjusted. If the pitch of the adjusting screws 33a and 33b is made finer, further fine adjustment is possible, and the parallelism between the nozzle surface of the recording head 6 and the platen 7 can be adjusted with higher accuracy.

  Further, as shown in FIGS. 5 and 6, since the adjustment screws 33a and 33b are provided on the left and right of the head holder 25, the adjustment amount can be changed on the left and right. Accordingly, the parallelism between the nozzle surface of the recording head 6 and the platen 7 can be adjusted including the twist of the head holder 25 and / or the distortion of the sub-carriage 18.

  Further, since the rotation of the head holder 25 around the rotation reference members 31a and 31b is restricted by the adjusting screws 33a and 33b, the head holder 25 rotates greatly and the nozzle surface of the recording head 6 comes into contact with the platen 7. Accidents can be prevented. Therefore, it is not necessary to use a jig or the like, and it can be easily adjusted while actually measuring and checking on an actual machine.

  5 to 7, the rotation reference member 31 is provided in the head holder 25 and the shaft hole 32 is provided in the sub-carriage 18. However, the present invention is not limited to this. Instead, the head holder 25 may be provided with a shaft hole, and the sub carriage 18 may be provided with a rotation reference member. Moreover, the rotation reference member 31 may be configured to insert a pin-shaped member, or may be configured to tighten a stepped screw.

  Further, fixing means for fixing the sub-carriage 18 and the adjustment member 35 and / or fixing means for fixing the sub-carriage 18 and the head holder 25 may be provided.

  5 and 6, the sub-carriage 18 is sandwiched and held between the reference shaft 15 and the carriage 5. However, the present invention is not limited to this. Alternatively, as shown in FIG. 10, the sub-carriage 18 may be hooked and held on the reference shaft 15 from the front. Further, the sub carriage 18 may be held on the reference shaft 15 without using the adjustment member 35 (without using the adjustment member 35).

  Subsequently, another embodiment of the present invention and an advantageous configuration will be described.

  FIG. 11 is a schematic perspective view showing a carriage according to another embodiment of the present invention, and FIG. 12 is a schematic front view showing a carriage according to another embodiment of the present invention. 11 and 12, the same components as those in FIGS. 5 and 6 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIGS. 11 and 12, adjustment cams 40 a and 40 b may be provided as angle adjustment units. The adjustment cams 40a and 40b are advantageous in that the adjustment resolution can be improved as compared with the adjustment screws 33a and 33b.

  FIG. 13 is a perspective view showing an example of the adjustment cam, and FIG. 14 is a schematic view showing an application example of the adjustment cam. As shown in FIG. 13, the adjustment cams 40 a and 40 b include a cam portion 41 and a shaft 42 attached eccentrically to the cam portion 41. Further, the cam portion 41 has a minus groove 43 for screwing. As shown in FIG. 14, the cam portions 41 of the adjustment cams 40 a and 40 b are rotatably attached to the holding portions 18 a and 18 b of the subcarriage 18. The head holder 25 can be lifted (or lowered) by the shaft 42 by rotating the cam portions 41 of the adjustment cams 40a and 40b. Thereby, the rotation angle of the head holder 25 relative to the sub-carriage 18 can be adjusted.

  Moreover, you may use an adjustment wedge member as an angle adjustment part. FIG. 15 is a perspective view showing an example of the adjusting wedge member, and FIG. 16 is a schematic view showing an application example of the adjusting wedge member. As shown in FIG. 15, the adjusting wedge members 44 a and 44 b have a wedge shape having a sloped surface 45. Further, as shown in FIG. 16, the screws 46a and 46b attached to the holding portions 18a and 18b of the subcarriage 18 are rotated, and the adjustment wedge members 44a and 44b are pushed in, whereby the head holder 25 rotates with respect to the subcarriage 18. The angle can be adjusted.

  The angle adjustment unit is not limited to the adjustment screw 33, the adjustment cam 40, and the like. Any means capable of regulating the rotation of the head holder 25 relative to the sub-carriage 18 and adjusting the rotation angle can be used. For example, a piezoelectric actuator can be used.

  Further, the reference shaft 15 may be fixed to the carriage 5 via adjustment plates 36 a and 36 b that can adjust the position with respect to the carriage 5. By adjusting the position of the reference shaft 15, the posture of the head holder 25 (height direction, rotation direction, and inclination in the main scanning direction) can be adjusted, and the mounting position accuracy of the recording head 6 can be improved.

  Furthermore, as shown in FIG. 12 (FIG. 17 as a side view), a cam member 38 may be provided on the reference shaft 15. The cam member 38 contacts the adjustment member 35 at the contact surface 39 and positions the sub carriage 18 in the vertical direction. By rotating the cam member 38, the sub-carriage 18 can be raised and lowered, and the distance between the recording head 6 and the platen 7 can be changed. Therefore, the height of the recording head 6 can be adjusted according to the sheet thickness or the like.

  As a method of rotating the cam member 38, the cam member 38 can be rotated by fixing the cam member 38 to the reference shaft 15 and rotating the reference shaft 15. The means for rotating the reference shaft 15 may be manual, or a drive source may be arranged, and the recording shaft 6 may be moved up and down by automatically rotating the reference shaft 15. This method allows the head 5 of the carriage 5 to be operated from the outside.

  By moving the head up and down by the cam member 38, the distance between the recording head 6 and the platen 7 can be arbitrarily adjusted on the actual machine according to the print medium, and the types of print media that can be handled can be expanded.

  Next, clear definitions will be given for terms used in the present application.

  The “liquid ejecting apparatus” is an apparatus that includes a liquid ejecting head or a liquid ejecting unit and that ejects liquid by driving the liquid ejecting head. The apparatus for ejecting liquid includes not only an apparatus capable of ejecting liquid to an object to which liquid can adhere, but also an apparatus for ejecting liquid toward the air or liquid.

  The “liquid ejecting apparatus” can include means for feeding, transporting, and ejecting a liquid to which liquid can adhere, and a pre-processing apparatus and a post-processing apparatus.

  “Liquid ejection device” includes, for example, an image forming device that forms an image on paper by ejecting ink, or a powder layered to form a three-dimensional model (three-dimensional model) There is a three-dimensional modeling apparatus (three-dimensional modeling apparatus) that discharges a modeling liquid onto the powder layer.

  Further, the “liquid ejecting apparatus” is not limited to the one in which significant images such as characters and figures are visualized by the ejected liquid. For example, it includes a pattern forming a pattern that has no meaning per se, and a pattern forming a three-dimensional image.

  The above-mentioned “applicable liquid” means that the liquid can be attached at least temporarily and adheres and adheres, or adheres and penetrates. Specific examples include recording media such as paper, recording paper, recording paper, film, and cloth, electronic parts such as electronic substrates and piezoelectric elements, powder layers (powder layers), organ models, and test cells. Yes, unless specifically limited, includes everything that the liquid adheres to.

  The material of the above-mentioned “applicable liquid” is temporary liquid such as paper, thread, fiber, fabric, leather, metal, plastic, glass, wood, ceramics, building materials such as wallpaper and flooring, textiles for clothing, etc. However, it only needs to be attached.

  The “liquid” is not particularly limited as long as it has a viscosity and surface tension that can be ejected from the head, and the viscosity becomes 30 mPa · s or less at room temperature, normal pressure, or by heating and cooling. Preferably there is. More specifically, solvents such as water and organic solvents, colorants such as dyes and pigments, functional materials such as polymerizable compounds, resins and surfactants, and biocompatible materials such as DNA, amino acids, proteins and calcium. And edible materials such as natural pigments, solutions, suspensions, emulsions and the like. These can be used, for example, in applications such as inkjet inks, surface treatment liquids, components for electronic elements and light-emitting elements, liquids for forming electronic circuit resist patterns, and three-dimensional modeling material liquids.

  In addition, the “liquid ejecting apparatus” includes an apparatus in which a liquid ejecting head and an apparatus capable of adhering liquid move relatively, but the present invention is not limited to this. Specific examples include a serial type apparatus that moves the liquid discharge head, a line type apparatus that does not move the liquid discharge head, and the like.

  As another example of the “liquid ejecting apparatus”, there is a processing liquid coating apparatus that ejects a processing liquid onto a sheet in order to apply the processing liquid to the surface of the sheet for the purpose of modifying the surface of the sheet. In addition, there is an injection granulation apparatus that granulates fine particles of raw materials by spraying a composition liquid in which raw materials are dispersed in a solution through a nozzle.

  A “liquid ejection unit” is a unit in which functional parts and mechanisms are integrated with a liquid ejection head, and is an assembly of parts related to liquid ejection. For example, the “liquid discharge unit” includes a combination of at least one of a head tank, a carriage, a supply mechanism, a maintenance / recovery mechanism, and a main scanning movement mechanism with a liquid discharge head.

  Here, the term “integrated” refers to, for example, a liquid discharge head, a functional component, and a mechanism that are fixed to each other by fastening, adhesion, engagement, etc., and one that is held movably with respect to the other. Including. Further, the liquid discharge head, the functional component, and the mechanism may be configured to be detachable from each other.

  The main scanning movement mechanism includes a guide member alone. The supply mechanism includes a single tube and a single loading unit.

  A “liquid ejection head” is a functional device that ejects and ejects liquid from a nozzle. As an energy generation source for discharging liquid, a piezoelectric actuator (laminated piezoelectric element or thin film piezoelectric element), a thermal actuator using an electrothermal transducer such as a heating resistor, an electrostatic actuator composed of a diaphragm and a counter electrode, etc. are used. It is done.

  In this specification, “paper” does not limit the material to paper, but includes OHP, cloth, glass, a substrate, and the like, and means that ink droplets, other liquids, and the like can adhere to the recording medium. , Recording media, recording paper, recording paper, and the like. In addition, image formation, recording, printing, printing, and printing are all synonymous.

  “Ink” is a generic term for all liquids capable of image formation, such as recording liquids, fixing processing liquids, liquids, and the like, unless otherwise specified. For example, DNA samples, resists, pattern materials, resins and the like are also included.

  The “image” is not limited to a flat image, but also includes an image given to a three-dimensionally formed image and an image formed by three-dimensionally modeling a solid itself.

  The present invention has been described in detail above using the embodiment. This embodiment is an example, and can be used with various modifications within a range not departing from the gist.

DESCRIPTION OF SYMBOLS 1 Apparatus main body 2 Support stand 3 Guide rod 4 Guide stay 5, 56 Carriage 6a, 6b, 6c, 50 Recording head 7 Platen 8 Maintenance recovery device 9 Main cartridge 10 Main scanning mechanism part 11 Drive motor 12 Drive pulley 13 Driven pulley 14 Timing Belt 15, 58 Reference shaft 18, 54 Subcarriage 18a, 18b Holding section 20 Paper 21 Paper feed means 25, 52 Head holder 31, 31a, 31b Rotation reference member 32, 32a, 32b Shaft hole 33, 33a, 33b Adjustment screw 35 Adjustment member 36a, 36b Adjustment plate 37 Subcarriage rotation reference 38 Cam member 39 Contact surface 40, 40a, 40b Adjustment cam 41 Cam portion 42 Shaft 43 Minus groove 44a, 44b Adjustment wedge member 45 Gradient surface 46a, 46b Screw 60 Rotating shaft 62 Long hole 64 clasp

Japanese Patent Application Laid-Open No. 2006-087873

Claims (8)

A liquid discharge head having a plurality of nozzles for discharging droplets;
A head holder for holding one or more liquid ejection heads;
A sub-carriage for holding the head holder;
A carriage that holds the sub-carriage and is movable in the main scanning direction;
A reference member extending along the main scanning direction is provided on the carriage,
The sub-carriage is supported by the reference member and positioned on the carriage,
Provided on either the head holder or the sub-carriage,
A rotation reference member for rotating the head holder around the main scanning direction with respect to the sub-carriage;
Provided on the other of the head holder and the sub-carriage,
A shaft hole that rotatably supports the rotation reference member;
A liquid ejection apparatus provided with an angle adjustment unit that regulates rotation of the head holder relative to the sub-carriage and adjusts a rotation angle.   The liquid ejecting apparatus according to claim 1, wherein the angle adjusting unit is provided at both ends of the head holder in the main scanning direction.   The liquid ejection apparatus according to claim 1, wherein the angle adjustment unit is an adjustment screw.   The liquid ejection apparatus according to claim 1, wherein the angle adjustment unit is an adjustment cam.   The liquid ejection apparatus according to claim 1, wherein the angle adjustment unit is an adjustment wedge member. The sub-carriage is supported by the reference member via an adjustment member,
6. The adjustment member according to claim 1, wherein the adjustment member is rotatably supported around the sub-carriage in a sub-scanning direction, and can adjust an inclination of the sub-carriage with respect to the reference member. Liquid discharge device.   The liquid ejecting apparatus according to claim 1, wherein the reference member is fixed to the carriage via an adjustment plate that adjusts a position of the reference member with respect to the carriage.   The liquid ejecting apparatus according to claim 1, wherein the reference member is provided with a cam member that contacts the sub carriage and positions the sub carriage in a vertical direction.

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