JP2008273080A - Printing device - Google Patents

Abstract

An ink jet printer capable of preventing contamination due to ink adhesion and increasing the flatness of a print area is provided.
A plurality of head units 17 and 18 for ejecting ink in the entire direction intersecting the print medium conveying direction are divided and arranged in a zigzag shape in a plan view.
A feed roller 14 and a pressure roller 15 are provided on the upstream side in the print medium conveyance direction of the inkjet head unit group 6, and the conveyance belt 1 is provided on the downstream side in the print medium conveyance direction of the inkjet head unit group 6. Below the ink tray 1
1 and an intermediate roller 1 between the upstream head unit 17 and the downstream head unit 18.
9 and the intermediate pressure contact roller 20, the intermediate pressure contact roller 20 abuts a portion of the print medium other than the portion where the ink is ejected from the upstream head unit 17, and the conveying belt 1 places the print medium 2 on the outer peripheral surface. Adsorb and transport.
[Selection] Figure 1

Description

The present invention relates to a printing apparatus that prints predetermined characters, images, and the like by ejecting liquid from a plurality of nozzles to form fine particles (dots) on a print medium.

Inkjet printers, which are one of such printing devices, are generally inexpensive and can easily obtain high-quality color printed matter. Therefore, with the spread of personal computers and digital cameras, not only offices but also general users. It has become widespread.
Such an ink jet printer discharges (jets) liquid ink droplets from the nozzles of the ink jet head while relatively moving the print medium and the liquid ejecting head (also referred to as an ink jet head), thereby forming minute ink dots on the print medium. In this way, a desired printed matter is created by drawing predetermined characters and images on the print medium. A device that places an ink jet head on a moving body called a carriage and moves it in a direction crossing the conveyance direction of the print medium is generally called a multipass ink jet printer. On the other hand, a long inkjet head (not necessarily integrated) is arranged in a direction intersecting the print medium conveyance direction to enable printing in a so-called one pass. It is called a “printer”.

In such a line head type ink jet printer, the flatness of the print medium is particularly important in the print region below the ink jet head. This is important not only in that the ink droplets ejected from the inkjet head are properly attached (also called landing) to a predetermined position of the print medium, but also in the sense that the distance between the inkjet head and the print medium is maintained in an appropriate state. It is. Therefore, in the ink jet printer described in the following Patent Document 1, a print medium is mounted on a conveyance belt and passes below the ink jet head, and ink droplets are ejected from the ink jet head when printing is performed. By providing a spur immediately below the downstream side in the print medium conveyance direction and pressing the print medium against the conveyance belt by this spur, the flatness of the print medium in the print region is increased.
Japanese Patent Laid-Open No. 7-178888

However, in the ink jet printer described in Patent Document 1, since the spur comes into contact with the surface printed by ejecting ink droplets from the ink jet head, the ink adheres to the spur itself, or the attached ink is There is a problem in that it adheres to the print medium or the conveyor belt and is damaged.
The present invention has been made paying attention to the above-described problems, and an object of the present invention is to provide a printing apparatus that can prevent contamination due to ink adhesion and can increase the flatness of a printing area. Is.

The printing apparatus according to the present invention includes a plurality of liquid ejecting head units that are dividedly arranged in the print medium conveying direction, a roller conveying unit that is provided upstream of the plurality of liquid ejecting head units in the printing medium conveying direction, and the plurality of liquid ejecting head units. Belt transport means provided on the downstream side of the liquid ejecting head unit in the print medium transport direction, a liquid receiver for receiving liquid ejected below the plurality of liquid ejecting head units, and dividedly arranged in the print medium transport direction An intermediate transport unit disposed between a liquid ejecting head unit upstream in the print medium transport direction and a head unit downstream in the print medium transport direction, wherein the intermediate transport unit is configured to print the print medium. An intermediate pressure contact roller is provided, which is in contact with a portion other than a region where the liquid is ejected from the head unit on the upstream side in the medium conveyance direction.
According to the present invention, the intermediate pressure contact roller of the intermediate conveying means does not contact the printed surface of the print medium, so that it is possible to prevent contamination due to liquid adhesion and to improve the flatness of the print area.

Further, in the printing apparatus according to the aspect of the invention, the plurality of liquid ejecting head units are arranged in a zigzag shape in a plan view spaced apart in a direction intersecting the print medium conveyance direction, and the intermediate pressure contact roller is arranged in the print medium conveyance direction. You may arrange | position between the head unit of the upstream of a printing medium conveyance direction and the head unit of a printing medium conveyance direction downstream between the adjacent printing medium conveyance direction upstream head units of the direction which cross | intersects.
In the printing apparatus of the present invention, the conveyance belt may adsorb the print medium with electrostatic force.
In the printing apparatus of the present invention, the conveyance belt may adsorb the print medium with negative air pressure.

Next, as an example of the printing apparatus of the present invention, an ink jet printer that discharges ink and prints characters, images, and the like on a print medium will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of an ink jet printer according to the present embodiment, FIG. 1a is a front view of the ink jet printer according to the present embodiment, and FIG. 1b is a plan view. Reference numeral 6 in the figure denotes an inkjet head unit group as a liquid ejecting head that ejects (discharges) a liquid such as ink in a droplet form. Reference numeral 1 in the figure denotes downstream of the inkjet head unit group 6 in the print medium conveyance direction. It is an endless conveying belt for conveying a printing medium 2 such as printing paper on the side. The conveyor belt 1 includes a driving roller 3 disposed at the left end of the figure and a driven roller 4 disposed at the right end of the figure.
And a tension roller 5 disposed below the central portion thereof. The drive roller 3 is rotationally driven in the direction of the arrow in the figure by a conveyance motor (not shown), and the print medium 2 is electrostatically adsorbed to the conveyance belt 1 charged by a charging roller, which will be described later. From left to right, that is, in the direction of the arrow. The driven roller 4 is grounded so as to apply a voltage with the conveying belt 1 being sandwiched between the driven roller 4 and a contact portion of a charging roller described later. The tension roller 5 is disposed inside the conveyor belt 1 and is biased downward by a tension applying mechanism (not shown), thereby applying tension to the conveyor belt 1. This conveyance belt 1 constitutes a belt conveyance means of the present invention.

A charging roller 7 as a charging unit is in contact with the conveyor belt 1 so as to face the driven roller 4, and an AC power supply 8 of about 10 to 50 Hz is connected to the charging roller 7. The arrangement of the charging roller 7 corresponds to the position immediately before the feeding position of the printing medium 2 to the conveying belt 1. The charging roller 7 charges the surface of the conveyance belt 1 made of a medium / high resistance by charging, charges the print medium 2 by the charge, and charges and conveys the print medium 2 by the dielectric polarization. The belt 1 conveys the print medium 2 by electrostatic force due to the electric charge of the dielectric portion on the surface of the belt 1.
Adsorb to the surface of The charging roller 7 is pressed against the transport belt 1 by a spring (not shown).

For example, as illustrated in FIG. 2, the inkjet head unit group 6 is configured by slightly separating the relatively small head units 17 and 18 having a length in the direction intersecting the print medium conveyance direction of about 30 to 40 mm in the print medium conveyance direction. The head units 17 and 18 are arranged in a staggered pattern in a plan view, and four nozzle rows of yellow (Y), magenta (M), cyan (C), and black (K) are formed in each of the head units 17 and 18. Are shifted in the print medium conveyance direction. The nozzles at the ends in the direction intersecting the print medium transport direction of the nozzle rows of the head units 17 and 18 are the nozzles at the print medium transport direction ends of the nozzle rows of the adjacent head units 17 and 18 arranged in a staggered pattern. It arrange | positions so that it may superpose | polymerize in a printing medium conveyance direction. Then, a necessary amount of ink droplets are simultaneously ejected from these nozzles to necessary locations, thereby forming and outputting minute ink dots on the print medium 2. By performing this for each color, it is possible to perform printing by so-called one-pass only by passing the print medium 2 adsorbed on the conveyor belt 1 once. That is, the arrangement area of the inkjet head unit group 6 (head units 17 and 18) corresponds to a printing area. Of the head units 17 and 18 arranged in a staggered manner, the upstream head unit 17 in the print medium conveyance direction is also referred to as an upstream head unit 17, and the downstream head unit 18 is also referred to as a downstream head unit 18.

As a method for ejecting and outputting ink from each nozzle of an ink jet head (head unit), there are an electrostatic method, a piezo method, a film boiling ink jet method, and the like. In the electrostatic method, when a drive pulse is applied to the electrostatic gap, which is an actuator, the diaphragm in the cavity is displaced, causing a pressure change in the cavity, and an ink droplet is ejected from the nozzle by the pressure change. is there. In the piezo method, when a drive pulse is applied to a piezo element that is an actuator, the diaphragm in the cavity is displaced to cause a pressure change in the cavity, and an ink droplet is ejected from the nozzle by the pressure change. In the film boiling ink jet method, there is a micro heater in the cavity, the ink is instantaneously heated to 300 ° C. or more, the ink becomes a film boiling state, bubbles are generated, and the ink droplet is ejected from the nozzle by the pressure change. Is. The present invention can be applied to any ink droplet ejection method.

The print medium 2 before being fed is stored in the paper feed unit 12, and auxiliary rollers 10 d and 10 f that feed the print medium 2 of the paper feed unit 12 and a feed are provided in the print medium conveyance direction ahead of the paper feed unit 12. Rollers 13d and 13f are disposed, and a feed roller 14 and a pressure contact roller 15 are disposed ahead of the feed rollers 13d and 13f in the print medium conveyance direction. This feed roller 14
The pressure roller 15 corrects the posture of the printing medium 2 abutted by the feed rollers 13d and 13f, adjusts the conveyance timing of the printing medium 2, and moves the printing medium 2 to the printing area at the adjusted conveyance timing. That is, it is for conveying below the inkjet head unit group 6 (head units 17 and 18). The feed roller 14 may be surface-coated with, for example, urethane or ceramic particles in order to increase the friction coefficient and increase the printing medium conveying force.

A flat plate-shaped regulating body 9 called a platen is disposed between the feed roller 14 and the pressure roller 15 and the conveying belt 1, that is, below the ink jet head unit group 6 (head units 17 and 18). As the name suggests, the plane regulating body 9 regulates the flatness of the print medium 2 conveyed to the printing area below the inkjet head unit group 6 (head units 17 and 18), as in the present embodiment. The line head type inkjet head unit group 6 is particularly important in terms of discharging ink droplets to a predetermined position and securing a gap with the print medium 2. A series of ink receivers 11 that cover at least the ink droplet ejection range from the inkjet head unit group 6 are disposed below the plane regulation body 9. The plane regulation body 9 includes the inkjet head unit group 6. A through hole 16 is formed through which the ejected ink droplet passes and is received by the ink receiver 11. Therefore, each through-hole 1 of the plane regulating body 9
When ink droplets are ejected from the inkjet head unit group 6 without the print medium 1 above 6, the ink droplets pass through the through holes 16 of the plane regulation body 9 and are received by the ink receiver 11.

As is well known, borderless printing in an ink jet printer is performed by ejecting ink droplets slightly outside the outer shape of the printing medium 2. In the present embodiment, the ink droplets ejected outside the outer shape of the printing medium 2 pass through the through hole 16 of the plane regulation body 9 and receive the ink receiver 1.
1, the ink does not adhere to the upper surface of the plane regulation body 9 or the surface opposite to the print surface of the print medium 2, and the surface opposite to the print surface of the print medium 2 does not get dirty. . The through-hole 16 can also allow the ink receiver 11 to receive ink droplets that are ejected in a state where the print medium 2 is not below the inkjet head unit group 6, for example. It can also be used for flushing aimed at nozzle recovery.

In the present embodiment, an intermediate roller 19 serving as an intermediate conveying unit is provided between the upstream head unit 17 and the downstream head unit 18 that constitute the inkjet head unit group 6.
The intermediate pressure roller 20 is disposed below the print medium conveyance line, and the intermediate pressure roller 20 is disposed above the print medium conveyance line. Similar to the feed roller 14 and the pressure roller 15, the intermediate roller 19 and the intermediate pressure roller 20 are for sandwiching and transporting the print medium 2 between them, but the upstream head unit 17 and the downstream side. The reason why it is provided between the head unit 18 is to restrict the flatness of the print medium 2 below the downstream head unit 18 and to secure a gap between the downstream head unit 18 and the print medium 2. .

FIG. 3 shows details of the intermediate pressure roller 20. This intermediate pressure contact roller 20 is, for example, shown in FIG.
As shown to a, with respect to one roller axis | shaft, it is attached so that it may jump only between the upstream head units 17 adjacent to the direction which cross | intersects a printing medium conveyance direction. This intermediate pressure roller 2
As described above, the 0 and the intermediate rollers 19 are connected to the print medium 2 before the downstream head unit 18.
However, as will be described later, when the ink droplets are ejected from the upstream head unit 17, the ink adheres to the intermediate pressure contact roller 20 itself, as will be described later. Or the adhering ink adheres to the next print medium 2 and is soiled. Therefore, the intermediate pressure contact roller 20 that contacts the printing surface side of the printing medium 2 is disposed only between the upstream head units 17 adjacent to each other in the direction intersecting the printing medium conveyance direction. In addition, the nozzles at the ends in the direction intersecting the print medium transport direction of the nozzle rows of the head units 17 and 18 are at the print medium transport direction end portions of the nozzle rows of the adjacent head units 17 and 18 arranged in a staggered pattern. Strictly speaking, the upstream head unit 1 adjacent to the direction intersecting the print medium conveyance direction is arranged so as to overlap the nozzle in the print medium conveyance direction.
7, the ink discharged from the upstream head unit 17 is not touched. That is, the intermediate pressure roller 20 needs to abut on a portion other than the portion where the liquid is ejected from the head unit on the upstream side in the print medium conveyance direction. The intermediate roller 19 may be a so-called straight roller, or may be disposed only between the adjacent upstream head units 17 like the intermediate pressure roller 20. The intermediate pressure roller 20 may be chamfered as shown in FIG. 3b. Further, the plane regulating body 9 is removed from the intermediate roller 19 portion.

Therefore, according to this inkjet printer, the auxiliary rollers 10d, 1d,
One print medium 2 is taken out by 0f, transferred to the feed rollers 13d and 13f, and fed to the nip portion of the transport roller 14 and the pressure roller 15. Even after the front end of the print medium 2 in the conveyance direction comes into contact with the nip portion of the conveyance roller 14 and the pressure roller 15, the feed roller 1
When the print medium 2 is fed by a predetermined amount by 3d and 13f, the print medium 2 is bent. After the bending occurs in this way, when the conveyance force of the print medium 2 by the feed rollers 13 d and 13 f, specifically, the clamping force is released, the front end portion of the print medium 2 in the conveyance direction becomes the nip between the conveyance roller 14 and the pressure roller 15. The posture of the print medium 2 is corrected in a state where it hits the part.

When the posture of the print medium 2 is corrected, the transport roller 14 and the pressure roller 15 are rotated to feed the print medium 2 above the plane regulation body 9. Since the upper portion of the plane regulation body 9 in the upstream portion in the print medium conveyance direction is a print area below the upstream head unit 17, ink droplets are ejected from the necessary nozzles of the upstream head unit 17 to print on the print medium 2. I do. At this time, even if borderless printing is performed, the ink droplets ejected outside the outer shape of the printing medium 2 are received by the ink receiver 11 through the through hole 16 of the plane regulating body 9. And print media 2
Ink does not adhere to the surface opposite to the printed surface, and they are not soiled.

The print medium 2 on which printing has been performed by the upstream head unit 17 is sandwiched between the intermediate roller 19 and the intermediate pressure contact roller 20 and is fed above the plane regulation body 9 in the downstream portion in the print medium conveyance direction. Since the upper portion of the plane regulating body 9 in the downstream portion in the print medium conveying direction is a print area below the downstream head unit 18, ink droplets are ejected from the necessary nozzles of the downstream head unit 18 and printed on the print medium 2. I do. Also in this case, since the ink droplets ejected outside the outer shape of the printing medium 2 by borderless printing are received by the ink receiver 11 through the through hole 16 of the plane regulating body 9, the upper surface of the plane regulating body 9 and the printing medium Ink does not adhere to the surface opposite to the printing surface 2 and they are not soiled.

The print medium 2 on which printing has been performed by the upstream head unit 17 and the downstream head unit 18 in this manner is slid on the upper surface of the plane regulating body 9 and fed to the upper surface of the transport belt 1. Since the conveyance belt 1 is alternately charged with the reverse polarity by the AC power supply 8 and the charging roller 7 in the printing medium conveyance direction, when the printing medium 2 is sent to the upper surface thereof, the above-described dielectric polarization acts. The print medium 2 is attracted to the upper surface of the transport belt 1 by electrostatic force. In this state, when the drive roller 3 is rotationally driven by an electric motor (not shown), the rotational driving force is transmitted to the driven roller 4 via the transport belt 1, and the print medium 2 is transported toward the paper discharge unit. When the print medium 2 reaches the paper discharge unit, for example, the print medium 2 is transferred to the conveyor belt 1 by a separation device (not shown).
The paper is discharged to the paper discharge unit while being separated from the surface of the paper. In this case, the conveyance belt 1 only electrostatically adsorbs the surface opposite to the printing surface of the printing medium 2, and there is nothing to touch the printing surface of the printing medium 2, so that contamination due to ink adhesion can be avoided. .

FIG. 4 shows the printing area (ink area) ejected from the upstream head unit 17 by hatching and the printing area (ink area) ejected from the downstream head unit 18 by cross hatching. Obviously, the intermediate pressure contact roller 20 is located between the upstream head unit 17 and the downstream head unit 18 at a position corresponding to the upstream head unit 17 adjacent in the direction intersecting the print medium conveyance direction. Since the intermediate pressure contact roller 20 does not touch the ink ejected from the upstream head unit 17,
Therefore, contamination due to ink adhesion can be avoided.

It is practically difficult to form a large number of nozzles at accurate positions over the entire nozzle surface of a long inkjet head corresponding to the width of the print medium. Therefore, even when a line head type ink jet head that covers the width of the print medium is configured, there is no choice but to arrange relatively short head units side by side. However, it is difficult to form the nozzles up to the end of the nozzle surface of the head unit. For example, as shown in FIG. 2 described above, the nozzles at the ends in the direction intersecting the print medium conveyance direction of the nozzle row of each head unit Must be arranged to overlap in the print medium transport direction with the nozzles in the print medium transport direction end of the nozzle row of the adjacent head units arranged in a staggered pattern, and the head units must be aligned in the print medium transport direction. Therefore, the length of the inkjet head in the print medium conveyance direction becomes long. In other words, the length of the print area in the print medium conveyance direction becomes long, and when the print medium in the print area is in a so-called free state, the flatness of the print medium cannot be regulated and the distance from the inkjet head cannot be secured. . Therefore, in the present embodiment, the upstream head unit 17 and the downstream head unit 18 are arranged in a staggered manner slightly apart in the print medium transport direction, and the intermediate roller 1 serving as an intermediate transport unit therebetween.
9 and an intermediate pressure roller 20 were disposed.

As described above, according to the ink jet printer of the present embodiment, the ink jet head unit group (liquid ejecting head unit group) that ejects ink (liquid) over the entire direction intersecting the print medium transport direction with respect to the transported print medium 2. ) A plurality of head units 17 constituting 6
, 18 are divided in the print medium conveyance direction, and a feed roller 14 and a pressure roller 15 (roller conveyance means) are provided on the upstream side in the print medium conveyance direction of the inkjet head unit group 6 composed of the plurality of head units 17, 18. Similarly, an inkjet head unit group 6 including a plurality of head units 17 and 18 is provided with a conveyor belt (belt conveying means) 1 on the downstream side in the print medium conveying direction of the inkjet head unit group 6 including a plurality of head units 17 and 18. An ink receiver (liquid receiver) 11 that receives ink (liquid) ejected below
The intermediate roller 19 and the intermediate pressure roller 20 (intermediate conveyance means) are provided between the upstream head unit 17 and the downstream head unit 18 that are divided and arranged in the print medium conveyance direction. Since the print belt 2 is configured to abut the print medium 2 by adsorbing the print medium 2 to the outer peripheral surface, the print belt 2 is in contact with a portion other than the portion where the ink is ejected from the upstream head unit 17. There is nothing that abuts the finished surface, so that contamination due to ink adhesion can be prevented, and the flatness of the printing area can be increased by the intermediate pressure contact roller 20.

In addition, a plurality of head units 17, 18 constituting the inkjet head unit group 6.
Are arranged in a zigzag shape in plan view apart from each other in the print medium conveyance direction, and the intermediate pressure contact roller 20 is located at a position corresponding to and between the upstream head units 17 adjacent to each other in the direction intersecting the print medium conveyance direction. By being disposed between the head unit 17 and the downstream head unit 18, the invention can be easily implemented, and the balance of conveyance and printing can be improved.

Next, a second embodiment of an ink jet printer to which the printing apparatus of the present invention is applied will be described with reference to FIG. FIG. 5A is a schematic front view of the ink jet printer of the present embodiment, and FIG. 3B is a plan view of the ink jet printer. In addition, the same code | symbol is attached | subjected to the component requirements equivalent to 1st Embodiment, and the detailed description is abbreviate | omitted. The conveyance belt 1 of the first embodiment sucks and conveys the print medium 2 by electrostatic force. In this embodiment, the print medium 2 is sucked and conveyed by the conveyance belt 1 using negative air pressure.

For this reason, in this embodiment, the AC power supply and the charging roller of the first embodiment, which are conveying belt charging means, are removed. Instead, a thin box-shaped duct 22 whose upper surface is made of a mesh, for example, is disposed immediately below the upper side surface of the inner circumferential surface of the conveying belt 1 that conveys the print medium 2. A suction fan 23 is connected to the. In this embodiment,
A large number of small holes are formed in an area of the conveying belt 1 where at least the print medium 2 must be sucked. In addition, it may replace with opening of a small hole and may make a relevant part mesh shape.
Therefore, when the suction fan 23 is driven to suck the air in the duct 22, negative air pressure is generated on the outer peripheral surface of the transport belt 1 through the small holes, and the print medium 2 fed to the outer peripheral surface of the transport belt 1 is air. It is sucked by the conveyor belt 1 by negative pressure. Accordingly, the print medium 2 printed on the printing surface is sucked by the transport belt 1 without being soiled and discharged to the paper discharge unit.

Next, a third embodiment of an ink jet printer to which the printing apparatus of the present invention is applied will be described with reference to FIG. FIG. 6 is a schematic front view of the ink jet printer according to the present embodiment. The configuration upstream of the feed rollers 13d and 13f in the print medium conveying direction is the first configuration shown in FIG.
Since it is the same as the embodiment, the illustration is omitted. In addition, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In the first embodiment, the intermediate conveying means is an intermediate roller, whereas in the present embodiment, the intermediate conveying belt 21 is used.
Further, since the transport belt is long in the print medium transport direction, the intermediate pressure contact rollers 20 are disposed at both ends of the intermediate transport belt 21 in the print medium transport direction, and the ink receiver 11 and the plane regulating body 9 are connected to the intermediate transport belt 21. Was divided into an upstream side and a downstream side in the print medium conveying direction.
The intermediate pressure contact roller may be spurred.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram which shows one Embodiment of the line head type inkjet printer to which this invention is applied, (a) is a top view, (b) is a front view. It is explanatory drawing of the head unit which comprises the inkjet head unit group of the inkjet printer of FIG. It is explanatory drawing of the intermediate pressure contact roller of the inkjet printer of FIG. FIG. 2 is an explanatory diagram showing a relationship between a printing area of the inkjet printer of FIG. 1 and a position of an intermediate pressure roller. It is a schematic block diagram which shows 2nd Embodiment of the line head type inkjet printer to which this invention is applied, (a) is a top view, (b) is a front view. It is a schematic front view which shows 3rd Embodiment of the line head type inkjet printer to which this invention is applied.

Explanation of symbols

1 is a conveying belt, 2 is a printing medium, 3 is a driving roller, 4 is a driven roller, 5 is a tension roller, 6 is an inkjet head unit group, 7 is a charging roller, 8 is an AC power source, 9 is a plane regulator, 10f, 10d is an auxiliary roller, 11 is an ink receiver, 12 is a paper feed unit, 13f and 13
d is a feed roller, 14 is a transport roller, 15 is a pressure roller, 16 is a through hole, 17 is an upstream head unit, 18 is a downstream head unit, 19 is an intermediate roller, 20 is an intermediate pressure roller, and 21 is an intermediate transport belt , 22 is a duct, 23 is a suction fan

Claims (5)

A plurality of liquid jet head units divided and arranged in the print medium conveyance direction;
Roller transport means provided on the upstream side in the print medium transport direction of the plurality of liquid jet head units;
Belt conveying means provided on the downstream side in the print medium conveying direction of the plurality of liquid ejecting head units;
A liquid receiver for receiving liquid ejected below the plurality of liquid ejecting head units;
An intermediate transport unit disposed between the liquid jet head unit upstream in the print medium transport direction and divided into the print medium transport direction and the liquid jet head unit downstream in the print medium transport direction. Characteristic printing device. The said intermediate conveyance means is provided with the intermediate pressure contact roller contact | abutted to parts other than the area | region where a liquid is ejected from the liquid ejecting head unit upstream of the said printing medium conveyance direction of the said printing medium. Printing device. The plurality of liquid ejecting head units are arranged in a zigzag shape in a plan view spaced apart in a direction intersecting the print medium conveyance direction,
The intermediate pressure roller includes a head unit on the upstream side in the printing medium conveyance direction and a head on the downstream side in the printing medium conveyance direction between adjacent head units on the upstream side in the printing medium conveyance direction in the direction intersecting the printing medium conveyance direction. The printing apparatus according to claim 2, wherein the printing apparatus is disposed between the units. The printing apparatus according to claim 1, wherein the conveyance belt attracts the print medium with electrostatic force. The printing apparatus according to claim 1, wherein the conveyance belt adsorbs a print medium with negative air pressure.

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