JP2024042650A - liquid discharge device - Google Patents

Abstract

To improve printing quality by suppressing striped unevenness of pretreatment liquid.SOLUTION: A liquid discharge device 1 includes: a holding member 15 capable of reciprocating while holding a recording medium; a pretreatment head 11 for discharging pretreatment liquid to a surface of the recording medium that is held by the holding member 15; a leveling member (leveling roller 21) for leveling the pretreatment liquid discharged to the surface of the recording medium along the surface of the recording medium with the movement of the holding member 15; and a print head 12 for discharging printing liquid to the surface of the recording medium at which the pretreatment liquid is leveled.SELECTED DRAWING: Figure 2

Description

The present invention relates to a liquid ejection device.

Depending on the model, liquid ejection devices such as inkjet printers can print not only general paper, but also non-permeable media such as coated paper, non-absorbent media such as plastic films, and fabrics such as woven and knitted fabrics, as well as analog printing. It is possible to form high quality images. Models that can print on sewn garments are sometimes called garment printers or direct-to-garment (DTG) printers.

Patent Document 1 (Japanese Unexamined Patent Publication No. 2019-25668) discloses a platen-moving liquid ejection device that prints on a print medium (media including fabric). When printing with ink on a fabric, a pretreatment liquid may be applied to the fabric in advance. Depending on the type of fabric, it may be necessary to use a pre-treatment liquid to bring out the color more clearly or to make the pattern stand out more.

Furthermore, depending on the media, it is necessary to evenly level the applied pretreatment liquid on the media, mainly for the purpose of suppressing fuzz. The liquid ejection device disclosed in Patent Document 1 includes a pretreatment head that applies a pretreatment liquid and a print head, and forms an image on a fabric by moving these heads in a scanning direction. The pretreatment head has a rotating section, and the rotating section uniformly spreads the pretreatment liquid on the fabric on the fabric as the head moves.

When the pretreatment liquid is leveled in the scanning direction of the pretreatment head as in Patent Document 1, the leveled state is linear or strip-like, which makes it easy for striped unevenness in the pretreatment liquid to occur, making it difficult to improve print quality.

Therefore, an object of the present invention is to improve printing quality by suppressing striped unevenness of the pretreatment liquid.

In order to solve the above problems, a liquid ejecting device of the present invention includes a holding member that is movable back and forth while holding a recording medium, and a pretreatment liquid is ejected onto the surface of the recording medium held by the holding member. a pretreatment head; a leveling member for smoothing the pretreatment liquid discharged onto the surface of the recording medium along the surface of the recording medium by movement of the holding member; It is characterized by comprising a print head that ejects printing liquid onto the surface of the recording medium.

According to the present invention, it is possible to suppress striped unevenness of the pretreatment liquid and improve printing quality.

1 is a perspective view of a liquid ejection device according to an embodiment of the present invention. There are (A) a schematic plan view and (B) a schematic cross-sectional view of the liquid ejection device. FIG. 2 is a side view of the liquid ejection device. FIG. 3 is a perspective view of the leveling member assembly. FIG. 3 is an enlarged perspective view of one end of the leveling member assembly. FIG. FIG. 3 is a front view of the leveling member assembly. FIG. 6 is an explanatory diagram illustrating a state in which a hand is caught between a holding member for holding a recording medium and a leveling member. FIG. 11 is a side view showing a modified example of the liquid ejection device. FIG. 7 is a perspective view showing a first modification of the leveling roller 21. FIG. 7 is a plan view showing a first modification of the leveling roller 21. FIG. 7 is a perspective view showing a second modification of the leveling roller 21. FIG. FIG. 11 is a plan view showing a second modified example of the smoothing roller 21.

(●Schematic configuration of liquid discharge device)
Hereinafter, a liquid ejection device according to the present invention will be explained with reference to the drawings. It should be noted that the present invention is not limited to the embodiments shown below, and can be modified as appropriate, such as other embodiments, additions, modifications, deletions, etc., within the range that can be conceived by those skilled in the art. Any aspect is included within the scope of the present invention as long as it achieves the functions and effects of the present invention.

1 is a perspective view of a liquid ejecting device 1 according to the present invention, FIG. 2(A) is a schematic plan view of the device, FIG. 2(B) is a schematic sectional view of the device, and FIG. 3 is a side view of the liquid ejecting device 1. It is a diagram. As shown in FIG. 1, a rectangular plate-shaped holding member (also called a "platen") 15 is provided on the front side of the liquid ejection device 1 for mounting and holding a recording medium (media). . The size etc. of the holding member 15 can be changed as appropriate.

The recording medium is not limited to those used as general recording media (for example, plain paper, glossy paper, special paper, etc.), but also includes wallpaper, flooring, building materials such as tiles, cloth for clothing such as T-shirts, etc. Textiles, leather, etc. can be used as appropriate. Further, by adjusting the configuration of the path for conveying the recording medium, ceramics, glass, metal, etc. can also be used.

In addition, good image formation is possible even when a non-permeable base material is used. The impermeable base material is a base material that has a surface with low water permeability and low absorbency, and also includes materials that have many cavities inside but are not open to the outside. , refers to a base material whose water absorption amount is 10 mL/m2 or less from the start of contact to 30 msec1/2 in the Bristow method. As the impermeable base material, for example, plastic films such as vinyl chloride resin film, polyethylene terephthalate (PET) film, polypropylene, polyethylene, and polycarbonate film can be suitably used.

The center of the lower surface of the holding member 15 is supported by a holding member moving base 17 via a columnar support portion 16 . Inside the holding member moving table 17, as shown in FIG. 2(B), there is built-in driving means as a second elevating means for moving the holding member 15 in the vertical direction (Z direction). The holding member 15 is configured to be movable up and down in the direction of arrow B in FIG. 2(B) by the driving means.

A preprocessing head 11 and a print head 12 are disposed at the center of the apparatus main body 10 in the front-rear direction (Y direction). The pretreatment head 11 has an inkjet nozzle for applying a pretreatment liquid to the surface of the recording medium. The print head 12 has an inkjet nozzle for applying printing ink to the surface of the recording medium. Further, on the front side of the print head 12, a leveling member assembly 20, which will be described later, is provided.

These pre-processing head 11 and print head 12 are movable back and forth in the direction of arrow A, respectively, along guide rails 13 and 14 arranged in the left-right direction (X direction) of the apparatus main body 10, as shown in FIG. ing. In the illustrated example, a guide rail 13 that guides the preprocessing head 11 is arranged at the back of the apparatus main body 10, and a guide rail 14 that guides the print head 12 is arranged closer to the front of the apparatus main body 10 than the guide rail 13. has been done.

Further, the holding member 15 is movable in the direction of arrow C in FIG. 2(A) along a guide rail 19 disposed in the front-rear direction (Y direction, first direction) of the apparatus main body 10. The guide rail 19 extending in the Y direction is arranged at right angles to the guide rails 13 and 14 extending in the X direction. The upper surface of the holding member 15 on which the recording medium is mounted constitutes a plane defined by the X direction and the Y direction.

The direction in which the pretreatment head 11 and the print head 12 move is sometimes referred to as the main scanning direction. The direction in which the holding member 15 moves is sometimes referred to as the sub-scanning direction.

(Leveling member assembly)
Leveling member assembly 20 will be described with reference to FIGS. 4A-4D. The leveling member assembly 20 is disposed on the front side of the print head 12 (on the upstream side in the forward movement direction of the holding member 15), that is, at the front end of the apparatus main body 10 as shown in FIG. Since the leveling member assembly 20 has a long contact time with the recording medium and requires frequent maintenance, it is disposed at the front end where access is relatively easy.

The leveling member assembly 20 includes a machine frame 20a extending in the width direction (X direction, second direction) of the device 1, a leveling roller 21 as a leveling member, and a leveling roller riser as a rise detection member. It has a detection member 22, an interlock switch 23, and a pair of left and right electromagnetic solenoids 24 as a first lifting means. In FIGS. 4A to 4D, a direction perpendicular to the first direction (Y direction) is the second direction (X direction). The shaft portions 21a at both ends of the leveling roller 21 are rotatably supported by a pair of left and right shaft support portions 21b.

The leveling roller 21 has a cylindrical elastic body integrally assembled around a core metal that is integral with the shaft portion 21a. By moving the holding member 15 in the direction C in FIG. 2(A) with the leveling roller 21 in contact with the surface of the fabric, etc. as a recording medium (printing target) set on the holding member 15, , the pretreatment liquid applied to the surface of the recording medium by the pretreatment head 11 can be leveled in the Y direction. It is also possible to use a leveling member such as a leveling blade instead of the leveling roller 21.

As shown in FIG. 4C, the shaft support portion 21b of the leveling roller 21 is integrated with the spring receiver 21c and the support plate 21d. The support plate 21d is attached to a machine frame plate 25, which is a part of the machine frame 20a, so as to be slidable in the vertical direction.

The spring receiver 21c is disposed so as to be movable in the vertical direction while being biased upward by the compression spring 26. The upper end of the lifting shaft 24a of the electromagnetic solenoid 24 is connected to the shaft support portion 21b of the leveling roller 21.

When the electromagnetic solenoid 24 is turned ON, the elevating shaft 24a is pulled downward against the compression spring 26, and the outer peripheral surface of the leveling roller 21 comes into contact with the surface of the recording medium on the holding member 15 (at the leveling position). ). At this time, since the electromagnetic solenoids 24 are arranged as a pair on the left and right, even if the surface of the recording medium is inclined in the X direction due to changes in the thickness of the recording medium, the outer peripheral surface of the leveling roller 21 Follows the slope and makes contact without any gaps. When the electromagnetic solenoid 24 is turned off, the pulling force of the lifting shaft 24a is released, and the spring receiver 21c and the shaft support portion 21b move upward due to the biasing force of the compression spring 26, and the outer circumferential surface of the leveling roller 21 is recorded. away from the medium (non-leveling position).

A leveling roller elevation detection member 22 is disposed along the length of the leveling roller 21 . This leveling roller rise detection member 22 is made of a long and thin sheet metal, and both ends in the longitudinal direction are rotatably supported by a support shaft 28 serving as a rotation shaft.

Detection portions 22a are formed at both ends of the leveling roller elevation detection member 22 to abut on the shaft portions 21a at both ends of the leveling roller 21. As the detection portion 22a is pushed up, the leveling roller elevation detection member 22 rotates clockwise in FIG. 4B around the support shaft 28.

On the other hand, an interlock switch 23 is disposed at one end of the leveling roller elevation detection member 22. This interlock switch 23 is for stopping the operation of the driving means for moving the above-mentioned holding member 15 in the vertical direction (Z direction).

A pressing portion 22b formed at one end of the leveling roller elevation detection member 22 is in contact with the tip of the actuating plate 29 that activates the interlock switch 23. When the leveling roller rise detection member 22 rotates clockwise about the spindle 28 in FIG. configured to operate.

(●Operation of liquid discharge device)
The operation of the liquid ejection device 1 will be explained with reference to FIG. First, a recording medium is set on the holding member 15 located at the chain line position (standby position) in FIG. 2(A). Then, the holding member 15 is moved in the direction (1) (inner side) in FIG. 2(A).

When the end (inner end) of the recording medium reaches the scanning range of the preprocessing head 11, the holding member 15 is temporarily stopped. In this stopped state, the pretreatment head 11 is scanned along the X direction to apply the pretreatment liquid onto the edge of the recording medium.

While intermittently moving the holding member 15 toward the back, the above-described scanning movement of the pretreatment head 11 and application of the pretreatment liquid are repeated. Thereby, the pretreatment liquid can be applied to the entire print area of the recording medium.

Next, the holding member 15 is moved in the direction (2) (toward the near side) in FIG. 2(A). When the front end of the recording medium on the holding member 15 reaches below the leveling member assembly 20, the holding member 15 is temporarily stopped.

Thereafter, the electromagnetic solenoid 24 is turned on. As a result, the leveling roller 21 descends against the compression spring 26, and its outer peripheral surface contacts the surface of the recording medium on the holding member 15.

(● Leveling roller operation)
In this state, the holding member 15 is moved again in the direction (2) (toward the near side) in FIG. 2(A), and the holding member 15 is moved to the standby position shown by the chain line in FIG. 2(A). During this movement process, the pretreatment liquid applied to the surface of the recording medium by the pretreatment head 11 can be uniformly leveled in the Y direction.

At this time, since the direction in which the pretreatment liquid is applied by the pretreatment head 11 (X direction) and the direction in which the holding member 15 or the recording medium moves (Y direction) are at right angles, the leveled state of the pretreatment liquid is in the X direction. It is made uniform in the Y direction, and printing quality can be improved. Improving print quality specifically refers to the effects of a pre-treatment liquid that brings out colors evenly and neatly and makes patterns stand out evenly during printing by the print head 12, which will be described later. It can be applied uniformly over the entire area.

After moving the holding member 15 to the standby position shown by the chain line in Fig. 2(A) and finishing leveling the pretreatment liquid, move the holding member 15 in the direction (3) (toward the back) in Fig. 2(A). Move again. When the end (inner end) of the recording medium reaches the scanning range of the print head 12, the holding member 15 is temporarily stopped. In this stopped state, the print head 12 is scanned along the X direction to apply ink onto the edge of the recording medium.

While intermittently moving the holding member 15 to the back side, the above-described scanning movement of the print head 12 and ink application are repeated. Thereby, ink can be applied to the entire print area of the recording medium.

Since the pretreatment liquid is made uniform in the X direction and the Y direction in the print area of the recording medium by the leveling roller 21, the print quality during ink application can be improved. When printing by the print head 12 is completed, the recording medium can be removed from the holding member 15 by returning the holding member 15 to the standby position indicated by the chain line in FIG. 2(A).

(●Maintenance of liquid discharge device)
In order to maintain good print quality of the liquid ejection device 1, it is desirable to perform regular maintenance. This periodic maintenance includes manual cleaning of the preprocessing head 11, print head 12, leveling roller 21, and the like by the user.

During maintenance, the holding member 15 is moved to the standby position shown by the chain line in FIG. 2(A), and from this standby position, the holding member 15 is lowered to the lowered position as shown by the chain line in FIG. 2(B). In this state, the hand H is inserted in the Y direction as shown in FIG. 5 to clean the inside of the device 1.

During this cleaning work, if the driving means of the holding member 15 is unexpectedly activated and the holding member 15 rises as shown by the arrow in FIG. It is caught between 21 and 21. The same applies when the electromagnetic solenoid 24 is turned on insufficiently and the leveling roller 21 is lowered. In this embodiment, when the user's hand H is about to be caught between the holding member 15 and the leveling roller 21, the driving means for the holding member 15 is immediately stopped by the interlock switch 23, or the electromagnetic solenoid is activated. 24 is forcibly turned off. The same applies even if the object to be caught is a cleaning tool or the like.

That is, when the holding member 15 rises and the user's hand H touches the leveling roller 21, the leveling roller 21 is pushed up as shown by the arrow in FIG. 4B. Then, the shaft portion 21a of the leveling roller 21 pushes up the detection portion 22a of the leveling roller rise detection member 22, and the leveling roller rise detection member 22 rotates clockwise in FIG. 4B around the support shaft 28. . Conversely, the same applies when the leveling roller 21 is lowered.

This rotation of the leveling roller rise detection member 22 causes the operating plate 29 to be pushed downward by the pressing portion 22b and rotate counterclockwise, activating the interlock switch 23. This interlock switch 23 then stops the drive means of the holding member 15 and forcibly turns off the electromagnetic solenoid 24. The interlock switch 23 directly cuts off the power supply to the motor of the drive means of the holding member 15 and forcibly turns off the electromagnetic solenoid 24, and as no software is involved, there is no need to consider software runaway, and the machine can be stopped safely.

It is impossible to predict where the user's hand H will be inserted in the left-right direction between the holding member 15 and the leveling roller 21. The interlock switch 23 must operate reliably no matter where the user's hand H is inserted in the left-right direction.

Therefore, in this embodiment, both ends of the leveling roller rise detection member 22 are supported by the support shaft 28, so that even if either the left or right shaft portion 21a of the leveling roller 21 is pushed up, either the left or right detection portion 22a is pushed up and the leveling roller rise detection member 22 is made to rotate without fail. Therefore, the interlock switch 23 operates reliably.

(Modified example of liquid discharge device)
A modification of the liquid ejection device 1 is shown in FIG. In this modification, the position of the leveling member assembly 20 is changed. That is, in the liquid ejection apparatus 1 shown in FIG. 3, the leveling member assembly 20 is disposed on the front side of the apparatus, which is convenient for maintenance, but in the modified example shown in FIG. It is located between 12.

By arranging the leveling member assembly 20 in this manner, it is possible to reduce the number of times (1 to 3) the movement of the holding member 15 is changed as shown in FIG. 2(A). That is, in FIG. 2A, it was necessary to move the holding member 15 three times from the back side to the front side to the back side, but in the modified example of FIG. 6, the holding member 15 was moved twice from the back side to the front side. It is efficient because pre-treatment liquid application, pre-treatment liquid leveling, and printing can be completed just by doing this.

When the holding member 15 is moved toward the rear, it moves until the front end of the recording medium reaches the scanning range of the pre-treatment head 11. After that, the holding member 15 is intermittently moved toward the front, and the following steps are performed in order: scanning and coating by the pre-treatment head 11 ⇒ smoothing by the smoothing roller 21 ⇒ printing by the print head 12.

(●Height detection components and others)
In FIGS. 3 and 6, 28 is a height detection member. This height detection member 28 detects whether the surface of the recording medium is at a height that does not interfere with the preprocessing head 11 or the print head 12 when the recording medium is moved to the back side. Printing is stopped if the surface of the recording medium exceeds a specified height.

Further, in FIGS. 3 and 6, 40 is a cover member of the liquid ejecting device 1. As shown in FIG. By opening the cover member 40 as shown in FIG. 1, internal maintenance can be performed.

(Modification example 1 of leveling roller)
7A and 7B show a first modification of the leveling roller 21. FIG. In this first modification, the leveling roller 21 is arranged in a direction (second direction) that is inclined with respect to the Y direction (first direction). That is, the leveling roller 21 is arranged in a direction inclined with respect to the guide rails 13, 14, 19 in the XY plane. Further, both ends of the guide rails 13 and 14 that movably support the preprocessing head 11 and the print head 12 are supported by a pair of left and right side plates 30 and 31.

Both ends of the leveling roller 21 are supported by a pair of leveling roller holders 32 and 33 arranged in the second direction. The leveling roller holding parts 32 and 33 can be constructed of plate-like members parallel to each other.

The leveling roller holding parts 32, 33 have guide vertical holes 32a, 33a that guide both ends of the leveling roller 21 so that it can be raised and lowered. The leveling roller 21 can be raised and lowered in the direction of arrow D along the guide vertical holes 32a, 33a. By moving the holding member 15 in the direction of arrow C with the leveling roller 21 lowered, the pretreatment liquid applied by the pretreatment head 11 to the surface of the recording medium on the holding member 15 can be uniformly leveled in the Y direction.

(Modification example 2 of leveling roller)
8A and 8B show a second modification of the leveling roller 21. FIG. In this second modification, the leveling roller 21 is arranged in a direction (second direction) parallel to the Y direction (first direction). Further, both ends of the guide rails 13 and 14 that movably support the preprocessing head 11 and the print head 12 are supported by a pair of left and right side plates 30 and 31.

Both ends of the leveling roller 21 are supported by leveling roller holding parts 34 and 35 arranged as a pair in the Y direction. The leveling roller holding parts 34 and 35 can be constructed from mutually parallel plate-like members.

The leveling roller holding parts 34 and 35 have guide horizontal holes 34a and 35a that guide both ends of the leveling roller 21 so as to be horizontally movable. The leveling roller 21 is capable of reciprocating in the direction of arrow E (direction parallel to the X direction) along the guide horizontal holes 34a, 35a.

By moving the leveling roller 21 in the direction of arrow E, the pretreatment liquid applied by the pretreatment head 11 to the surface of the recording medium on the holding member 15 can be uniformly leveled in the X direction. As shown in variants 1 and 2, the leveling roller 21 can also be arranged along a direction other than the X direction (second direction) perpendicular to the Y direction (first direction).

<Additional notes>
Hereinafter, preferred embodiments of the present invention will be additionally described.
<First aspect>
a holding member that can reciprocate while holding a recording medium; a pretreatment head that discharges a pretreatment liquid onto the surface of the recording medium held by the holding member; and a pretreatment head that discharges a pretreatment liquid onto the surface of the recording medium. a leveling member for leveling the treatment liquid along the surface of the recording medium by movement of the holding member; a print head for discharging printing liquid onto the surface of the recording medium with the pretreatment liquid leveled; A liquid ejection device characterized by having:
<Second aspect>
The leveling member is arranged to be movable up and down by a first elevating means between a leveling position where the surface of the recording medium is in contact with the pretreatment liquid and a non-leveling position where it is not in contact with the pretreatment liquid. A liquid ejecting device according to a first aspect.
<Third aspect>
A raised position when the holding member discharges the pretreatment liquid or the printing liquid onto the surface of the recording medium, and a lowered position when the holding member does not discharge the pretreatment liquid or the printing liquid onto the surface of the recording medium. The liquid ejecting device according to the first aspect or the second aspect, characterized in that the liquid ejecting device is arranged to be movable up and down between the two positions by a second elevating means.
<Fourth aspect>
When the holding member is raised by the second elevating means with the object held between the holding member and the leveling member, the leveling member is pushed up by the object to be held, and the leveling member is The liquid discharging device according to the third aspect, wherein an interlock switch of the second elevating means is actuated by pushing up the leveling member to stop the holding member.
<Fifth aspect>
The liquid ejecting device according to any one of the second to fourth aspects, wherein both longitudinal ends of the leveling member are arranged to be movable up and down by the first lifting means.
<Sixth aspect>
A rise detection member is disposed above the leveling member, and when the leveling member is pushed up by the object to be pinched, the interlock switch is configured to operate via the rise detection member. A liquid ejection device according to a fourth aspect.
<Seventh aspect>
The holding member is arranged to be reciprocally movable in a first direction, and the leveling member is arranged along a second direction perpendicular to the first direction. A liquid ejection device according to any one of the first to sixth aspects.
<Eighth aspect>
The holding member is arranged to be reciprocally movable in a first direction, and the leveling member is arranged along a second direction inclined to the first direction. A liquid ejection device according to any one of the first to sixth aspects.
<9th aspect>
The holding member is arranged to be reciprocally movable in a first direction, and the leveling member is arranged along a second direction parallel to the first direction and perpendicular to the first direction. The liquid ejection device according to any one of the first to sixth aspects, wherein the liquid ejection device is disposed so as to be movable back and forth in a direction.
<10th aspect>
The rise detection member is arranged along the second direction, and the detection portions at both longitudinal ends of the rise detection member are in contact with the upper surfaces of both longitudinal ends of the leveling member. A liquid ejection device according to a seventh aspect.
<Eleventh aspect>
Both longitudinal ends of the rise detection member are supported by a rotating shaft, and when the leveling member is pushed up by the object to be pinched, the interlock switch is actuated through the rotational movement of the rise detection member. A liquid ejection device according to a seventh aspect, characterized in that the liquid ejection device is configured as follows.
<Twelfth aspect>
In the first to eleventh aspects, the leveling member, the printing head, and the pretreatment head are sequentially arranged from the upstream side in the forward movement direction of the holding member in the first direction. A liquid ejection device according to any one of the aspects.
<13th aspect>
The liquid ejecting apparatus according to the twelfth aspect, wherein a height detection sensor for detecting the surface height of the recording medium is disposed between the leveling member and the print head.
<Fourteenth aspect>
In the first to eleventh aspects, the printing head, the leveling member, and the pretreatment head are sequentially arranged from the upstream side in the forward movement direction of the holding member in the first direction. A liquid ejection device according to any one of the aspects.
<15th aspect>
The liquid ejecting apparatus according to the fourteenth aspect, wherein a height detection sensor for detecting the surface height of the recording medium is disposed upstream of the print head.

1: Liquid ejection device 10: Device main body 11: Pre-processing head 12: Print heads 13, 14: Guide rail 15: Holding member 16: Support portion 17: Holding member moving table 19: Guide rail 20: Leveling member assembly 20a : Machine frame 21: Leveling roller (leveling member)
21a: Shaft portion 21b: Shaft support portion 21c: Spring receiver 21d: Support plate 22: Roller elevation detection member 22a: Detection portion 22b: Pressing portion 23: Interlock switch 24: Electromagnetic solenoid 24a: Lifting shaft 25: Machine frame plate 26 : Compression spring 28: Support shaft 28: Detection member 29: Operating plate 30, 31: Side plates 32, 33: Leveling roller holding section 32a, 33a: Guide vertical holes 34, 35: Leveling roller holding section 34a, 35a: Guide Lateral hole 40: Cover member H: Hand (caught object)

JP2019-25668A

Claims (15)

a holding member capable of reciprocating while holding a recording medium;
a pre-processing head that discharges a pre-processing liquid onto the surface of the recording medium held by the holding member;
a leveling member that smoothes the pretreatment liquid discharged onto the surface of the recording medium along the surface of the recording medium by moving the holding member;
a print head that discharges a printing liquid onto the surface of the recording medium on which the pretreatment liquid is leveled;
A liquid ejection device characterized by having: The leveling member is arranged to be movable up and down by a first elevating means between a leveling position where the surface of the recording medium is in contact with the pretreatment liquid and a non-leveling position where it is not in contact with the pretreatment liquid. 2. The liquid ejecting device according to claim 1, further comprising a liquid ejecting device. A raised position when the holding member discharges the pretreatment liquid or the printing liquid onto the surface of the recording medium, and a lowered position when the holding member does not discharge the pretreatment liquid or the printing liquid onto the surface of the recording medium. 2. The liquid ejecting device according to claim 1, wherein the liquid ejecting device is arranged to be movable up and down between the two positions by a second elevating means. When the holding member is raised by the second elevating means with the object held between the holding member and the leveling member, the leveling member is pushed up by the object to be held, and the leveling member is 4. The liquid discharging device according to claim 3, wherein an interlock switch of the second elevating means is actuated by pushing up the leveling member to stop the holding member. 3. The liquid ejecting device according to claim 2, wherein both longitudinal ends of the leveling member are arranged to be movable up and down by the first elevating means. A rise detection member is disposed above the leveling member, and when the leveling member is pushed up by the object to be pinched, the interlock switch is configured to operate via the rise detection member. 5. The liquid ejecting device according to claim 4. A claim characterized in that the holding member is arranged to be reciprocally movable in a first direction, and the leveling member is arranged along a second direction perpendicular to the first direction. Item 1. Liquid ejection device. A claim characterized in that the holding member is arranged to be reciprocally movable in a first direction, and the leveling member is arranged along a second direction inclined to the first direction. Item 1. Liquid ejection device. The holding member is arranged to be reciprocally movable in a first direction, and the leveling member is arranged along a second direction parallel to the first direction and perpendicular to the first direction. 2. The liquid ejecting device according to claim 1, wherein the liquid ejecting device is disposed so as to be movable back and forth in a direction. The rise detection member is arranged along the second direction, and the detection portions at both longitudinal ends of the rise detection member are in contact with the upper surfaces of both longitudinal ends of the leveling member. The liquid ejection device according to claim 7. Both longitudinal ends of the rise detection member are supported by a rotating shaft, and when the leveling member is pushed up by the object to be pinched, the interlock switch is actuated through the rotational movement of the rise detection member. 8. The liquid ejecting device according to claim 7, wherein the liquid ejecting device is configured as follows. The liquid ejection device according to claim 7, characterized in that the leveling member, the print head, and the pretreatment head are arranged in this order from the upstream side of the forward movement direction of the first direction of the holding member. 13. The liquid ejection apparatus according to claim 12, further comprising a height detection sensor for detecting the surface height of the recording medium, provided between the leveling member and the print head. 8. The liquid ejecting apparatus according to claim 7, wherein the printing head, the leveling member, and the pretreatment head are sequentially arranged from an upstream side in the forward movement direction of the holding member in the first direction. 15. The liquid ejection apparatus according to claim 14, further comprising a height detection sensor for detecting the surface height of the recording medium provided upstream of the print head.