Inkjet printing device

An inkjet printing device includes an inkjet head that ejects ink to paper to be transported, a blocking unit that blocks ink mist on a downstream side of the inkjet head in a transport direction of paper, an ink mist collection mechanism and a belt platen that collect ink mist blocked by the blocking unit.

TECHNICAL FIELD

The present invention relates to an inkjet printing device that performs printing by ejecting ink from an inkjet head.

RELATED ART

An inkjet printing device that performs printing by ejecting ink from an inkjet head to paper, while transporting paper has been known.

In such an inkjet printing device, ink mist is generated around the inkjet head due to ejection of ink from the inkjet head. Ink mist is caused to flow to a downstream side in a transport direction of paper by an air current generated by the transport of the paper, to contaminate a member such as a guide plate that guides the paper. Therefore, there is a possibility that a printed material is contaminated due to contact of the printed material with the member contaminated by ink mist.

Meanwhile, Japanese Patent Application Publication No. 2015-139978 discloses a device that collects ink mist in a suction transport mechanism by using a suction wind in the suction transport mechanism that transports paper while sucking and holding the paper by air suction.

However, even if the suction transport mechanism is used, ink mist cannot be sucked in a region where the paper is adsorbed. Accordingly, ink mist cannot be collected sufficiently. As a result, ink mist may flow to a downstream side. Therefore, according to the device disclosed in Japanese Patent Application Publication No. 2015-139978, there is a possibility that a member such as a guide plate is contaminated by ink mist that is not collected and flows to the downstream side, thereby contaminating the printed material.

The present invention has been achieved in view of the problem described above, and an object of the present invention is to provide an inkjet printing device that can reduce contamination of a printed material.

SUMMARY

In order to achieve the above object, an inkjet printing device according to the present invention comprises: an inkjet head that ejects ink to paper to be transported; a blocking unit that blocks ink mist on a downstream side of the inkjet head in a transport direction of paper; and a collection unit that collects ink mist blocked by the blocking unit.

According to the inkjet printing device of the present invention, it is possible to reduce contamination of a printed material.

DETAILED DESCRIPTION

Embodiments of the present invention will be described below with reference to the drawings. In the descriptions of the drawings explained below, like or similar reference signs are denoted to like or similar parts and constituent elements.

The following embodiments are only examples illustrating a device or the like for realizing the technical ideas of the present invention, and in the technical ideas of the invention, materials, forms, structures, arrangements, and the like of respective component parts are not limited to those in the embodiments described below. The technical ideas of the present invention can be variously modified within the scope of claims.

First Embodiment

FIG. 1is a schematic configuration diagram of an inkjet printing device according to a first embodiment of the present invention.FIG. 2is a plan view of a vicinity of a blocking unit and an ink mist collection mechanism in the inkjet printing device illustrated inFIG. 1.FIG. 3is a partial enlarged sectional view of a vicinity of the blocking unit and the ink mist collection mechanism.FIG. 4is an enlarged view of relevant parts of the ink mist collection mechanism.FIG. 5is a control block diagram of the inkjet printing device illustrated inFIG. 1.

In the following descriptions, a direction orthogonal to the drawing inFIG. 1is a front-rear direction, and a surface direction of the drawing is a front side. Further, up and down and right and left of the drawing inFIG. 1are vertical and horizontal directions, respectively. InFIG. 1, a direction from the left to the right is a transport direction of paper P, which is a printing medium. In the following descriptions, upstream and downstream mean upstream and downstream in the transport direction of the paper P.

As illustrated inFIG. 1andFIG. 5, an inkjet printing device1according to the first embodiment includes a transport unit2, a printing unit3, a blocking unit4, an ink mist collection mechanism (corresponding to a downstream collection unit of a collection unit)5, a guide unit6, and a controller7.

The transport unit2transports the paper P fed from a paper feeder (not illustrated). The transport unit2includes a belt platen (corresponding to an upstream collection unit of the collection unit)11and a plurality of paper pressing rollers12.

The belt platen11transports the paper P while sucking and holding the paper P by air suction. The belt platen11also has a function of sucking and collecting ink mist. The belt platen11includes a transport belt21, a drive roller22, driven rollers23to25, a belt platen motor26, a platen27, a platen plate28, a chamber29, and a paper suction fan30.

The transport belt21transports the paper P by sucking and holding the paper P. The transport belt21is an annular belt spanned over the drive roller22and the driven rollers23to25. A large number of belt holes21abeing through-holes are formed in the transport belt21. The transport belt21sucks and holds the paper P on a transport surface21bby a suction force generated in the belt holes21adue to drive of the paper suction fan30. The transport surface21bis an upper surface of a horizontal portion of the transport belt21between the drive roller22and the driven roller23. The transport belt21transports the paper P placed on the transport surface21brightward by being rotated in a clockwise direction inFIG. 1.

The drive roller22rotates the transport belt21in the clockwise direction inFIG. 1.

The driven rollers23to25support the transport belt21together with the drive roller22. The driven rollers23to25are rotated by following the rotation of the drive roller22via the transport belt21. The driven roller23is arranged leftward of the drive roller22at the same height as the drive roller22. The driven rollers24and25are arranged below the drive roller22and the driven roller23and away from each other in the horizontal direction at the same height.

The belt platen motor26rotationally drives the drive roller22.

The platen27is arranged below the transport belt21between the drive roller22and the driven roller23to support the transport belt21slidably. The platen27is formed with a large number of suction holes27a, which are through-holes. The suction holes27aare formed at positions at which the belt holes21apass.

The platen plate28is arranged below the platen27to equalize the amount of suction wind generated by the paper suction fan30with respect to the belt holes21aand the suction holes27ain the platen27. The platen plate28is foamed with a large number of suction holes28aover the whole surface thereof.

The chamber29forms a negative pressure chamber so as to generate a suction force in the belt holes21aof the transport belt21. The chamber29is provided on a rear surface side of the platen27between the drive roller22and the driven roller23.

The paper suction fan30evacuates the chamber29. Accordingly, the paper suction fan30generates a negative pressure in the chamber29to suck air via the suction holes28ain the platen plate28, the suction holes27ain the platen27, and the belt holes21a. Accordingly, the suction force is generated in the belt holes21aand the paper P is sucked to the transport surface21bof the transport belt21. Further, ink mist is sucked from the belt holes21a, which are not blocked by the paper P at a position between pieces of paper, and is collected in the chamber29.

The paper pressing roller12is a member that presses the paper P transported by the transport belt21. The paper pressing roller12is rotated by following the rotation of the transport belt21.

The printing unit3performs printing on the paper P transported by the transport unit2. The printing unit3includes three inkjet heads41, a head holder42, and a lifting drive unit43.

The inkjet head41ejects ink to the paper P to print an image thereon. Three inkjet heads41are arranged in parallel along a sub-scanning direction (horizontal direction), which is a transport direction of the paper P. As illustrated inFIG. 2, the respective inkjet heads41respectively have six head modules46.

The head module46has a plurality of nozzles (not illustrated) that are open in an ejection surface46a, which is a lower surface facing the transport surface21bof the transport belt21, to eject ink from the nozzles. The nozzles are arranged along a main scanning direction (a front-rear direction).

In the inkjet head41, the head modules46are arranged in a staggered manner along the main scanning direction. That is, in the respective inkjet heads41, six head modules46arranged along the main scanning direction are arranged at alternately shifted positions in the sub-scanning direction.

The head holder42holds the inkjet heads41. The head holder42is formed by a hollow box. The head holder42is arranged above the belt platen11. A plurality of openings, to which the respective head modules46of the respective inkjet heads41are attached, are formed on a bottom surface of the head holder42. The head holder42holds the head modules46of the respective inkjet heads41, in such a manner that lower ends of the head modules46project downward from the openings.

The lifting drive unit43moves the belt plate11upward and downward. The lifting drive unit43includes a motor or the like (not illustrated).

The blocking unit4is to block ink mist flowing to the downstream side, on the downstream side of the inkjet head41on the most downstream side. The blocking unit4is arranged at a downstream end (a right end) of the transport surface21bof the belt platen11. The blocking unit4includes four blocking rollers51and a blocking sheet52.

The blocking roller51is a member for blocking ink mist on the transport surface21b. The blocking roller51is arranged at the downstream end (the right end) of the transport surface21bso that a direction of a rotation shaft thereof is parallel to the front-rear direction, and is rotated by following the rotation of the transport belt21. The four blocking rollers51are arranged along the front-rear direction with a predetermined gap (an opening)51atherebetween. That is, in the blocking unit4, three gaps51aare arranged with an interval therebetween along the front-rear direction. An upstream side and a downstream side of the blocking unit4communicate with each other via the gaps51a.

The blocking sheet52is a member that blocks ink mist shifting beyond the blocking rollers51. The blocking sheet52is made of a sheet-like member long in the front-rear direction. The blocking sheet52is arranged above the blocking rollers51so as to cover the four blocking rollers51. The blocking sheet52is attached to a duct63of the ink mist collection mechanism5described later.

The ink mist collection mechanism5is for collecting ink mist temporarily blocked by the blocking unit4via the gaps51aof the blocking unit4. The ink mist collection mechanism5is installed near the downstream side of the blocking unit4at a position on an upstream side of the guide plates71and72described later.

The ink mist collection mechanism5includes two ink mist suction fans61, two connecting portions62, the duct63, and three shutters64.

The ink mist suction fan61exhausts air from the connecting portions62and the duct63. Accordingly, the ink mist suction fan61generates a negative pressure in the connecting portions62and the duct63and sucks the air including ink mist from a space above the transport surface21hvia a suction port63aof the duct63described later. The ink mist suction fan61is connected one by one to a front end and a rear end of the duct63via the connecting portions62.

The connecting portion62connects the ink mist suction fan61to the duct63. The connecting portion62is formed by a hollow box. The connecting portion62is connected one by one to the front end and the rear end of the duct63.

The duct63forms a flow channel of air for sucking the air including ink mist from the space above the transport surface21bby the ink mist suction fan61. The duct63is formed in a prismatic hollow shape long in the front-rear direction. The duct63is attached to a lower surface of the head holder42. As illustrated inFIG. 4, the duct63has three suction ports63aformed in a lower part of an upstream-side (left-side) surface thereof.

The suction port63ais an opening for sucking the air including ink mist into the duct63. The three suction ports63aare arranged with an interval therebetween along the front-rear direction. The three suction ports63aare provided respectively correspondingly to the three gaps51aof the blocking unit4. That is, the three suction ports63aare arranged at positions at which the suction ports63aoverlaps on the three gaps51ain the front-rear direction, respectively. The suction ports63aare open in the vicinity of an upper part of the transport surface21bat the downstream end of the transport surface21b.

The shutter64opens and closes the suction port63aof the duct63. The shutter64is configured to be able to adjust an opening area of the suction port63a. Three shutters64are provided respectively correspondingly to the three suction ports63a. The shutter64is driven by a motor (not illustrated).

The guide unit6guides the paper P transported to the downstream side of the transport unit2. The guide unit6includes a pair of guide plates71and72, and a shielding member73.

The guide plates71and72are members that guide the paper P transported from the belt platen11to a transport mechanism (not illustrated) on a downstream side thereof.

The shielding member73is a member that shields between the head holder42and the guide plate71in order to suppress diffusion of ink mist.

The controller7controls operations of the respective units of the inkjet printing device1. The controller7is configured to include a CPU, a RAM, a ROM, a hard disk, and the like.

Next, operations of the inkjet printing device1are explained.

Upon input of a printing job, the controller7controls the lifting drive unit43so as to adjust a height position of the belt platen11according to the type of paper to be used in printing by the printing job. Accordingly, a head gap, which is a distance between the ejection surface46aand the paper P on the transport surface21bat the time of transporting the paper P by the belt platen11, becomes a size corresponding to the paper type.

Subsequently, the controller7starts to drive the belt platen11. Specifically, the controller7starts to drive the drive roller22by the belt platen motor26. Accordingly, the transport belt21is started to drive in a move-around manner. Further, the controller7starts to drive the paper suction fan30. When downward exhaust is performed from the chamber29due to the drive of the paper suction fan30, the air is sucked into the chamber29via the suction holes28aof the platen plate28, the suction holes27aof the platen27, and the belt holes21aof the transport belt21. Accordingly, a negative pressure is generated in the belt holes21ato generate a suction force.

The controller7starts to drive the ink mist collection mechanism5. Specifically, the controller7starts to drive the two ink mist suction fans61and opens the suction ports63aof the duct63by controlling the shutters64.

The controller7determines the suction port63ato be opened according to the size of the paper P to be printed. Specifically, when the paper P having a size with a paper width (a length in the front-rear direction of the paper P) being less than a threshold is to be printed, the controller7opens the central suction port63a, and closes the frontmost suction port63aand the rearmost suction port63a. When the paper P having a size with the paper width being equal to or larger than the threshold is to be printed, the controller7opens all the suction ports63a. Here, in the inkjet printing device1, the paper P is transported in such a manner that the center of the transport surface21band the center of the paper P in the front-rear direction are matched with each other on the belt platen11.

Further, the controller7controls the shutter64corresponding to the suction port63ato be opened so that an opening area of the suction port63abecomes a size corresponding to a coverage rate with respect to a first piece of paper P and the head gap.

When the head gap is the same, as the coverage rate becomes lower, the opening area of the suction port63ais set to be smaller. Further, when the coverage rate is the same, as the head gap becomes smaller, the opening area of the suction port63ais set to be smaller. As the coverage rate becomes lower and as the head gap becomes smaller, ink mist to be generated decreases. Therefore, it is possible to suppress degradation in the printing image quality due to the influence of suction wind by reducing the amount of the suction wind generated by the ink mist collection mechanism5.

When the drive of the belt platen11and the ink mist collection mechanism5is started, pieces of paper P for the number of the paper P to be printed in the printing job are fed to the belt platen11sequentially. The fed paper P is sucked and held by the transport belt21of the belt platen11and transported while being pressed by the paper pressing rollers12and the blocking rollers51. In the belt platen11, respective pieces of paper P are transported with a predetermined interval. The controller7causes the inkjet head41to eject ink to the paper P transported below the inkjet head41to print an image.

The printed paper P is transported by a transport mechanism (not illustrated) on the downstream side of the belt platen11, while being guided by the guide plates71and72, and is ejected.

Here, after start of the printing operation, the controller7controls opening and closing of the suction ports63aaccording to the position in the transport direction of the transported paper P on the belt platen11.

Specifically, when a front edge of the paper P has reached the inkjet head41on the most downstream side, as illustrated inFIG. 6, the controller7closes the suction port63ato be opened by controlling the shutter64corresponding to the suction port63a.

Further, when the front edge of the paper P has reached a downstream end of the chamber29, as illustrated inFIG. 7, the controller7opens the suction port63ato be opened by controlling the shutter64corresponding to the suction port63a. The downstream end of the chamber29corresponds to a downstream end of a region in which ink mist can be sucked from the belt holes21aon the transport surface21b.

The controller7determines a timing when the front edge of the paper P reaches the inkjet head41on the most downstream side and a timing When the front edge of the paper P reaches the downstream end of the chamber29, based on a timing when the front edge of the paper P has been detected by a paper sensor (not illustrated) arranged at a predetermined position.

The controller7executes opening/closing control of the suction ports63adescribed above with respect to the respective pieces of paper P sequentially fed to and transported by the belt platen11.

When the front edge of the paper P has reached the downstream end of the chamber29and the controller7opens the suction port63ato be opened, the controller7controls the shutter64so that the opening area of the suction port63abecomes a size corresponding to the coverage rate with respect to the paper P and the head gap.

The amount of suction wind can be adjusted by adjusting the opening area of the suction port63aby the shutter64, with higher responsiveness than that at the time of controlling the amount of wind of the ink mist suction fan61. With this adjustment, it is possible to handle high speed printing.

Collection of ink mist by the ink mist collection mechanism5in which opening/closing control of the suction port63ais executed as described above and by the belt platen11is described.

Ink mist generated by ejection of ink by the inkjet head41flows to the downstream side due to a transport air current generated by transport of the paper P by the belt platen11.

A part of ink mist flowing to the downstream side is collected by the belt platen11by being sucked from the belt holes21athat are not blocked by the paper P at a position between pieces of paper or the like, before reaching the blocking unit4. The ink mist having reached the blocking unit4without being collected by the belt platen11is blocked by the blocking unit4. A part of the ink mist blocked by the blocking unit4is sucked from the belt holes21aand collected by the belt platen11, in a state where the belt holes21ain a region near the upstream side of the blocking unit4are not blocked by the paper P.

In a state where at least one of the suction ports63ais opened, the other part of the ink mist blocked by the blocking unit4passes through the gap51acorresponding to the opened suction port63aand flows to the downstream side of the blocking unit4by the suction wind flowing into the opened suction port63a. The ink mist that has flowed to the downstream side of the blocking unit4is sucked by the duct63via the opened suction port63aand collected by the ink mist collection mechanism5.

As described above, when the front edge of the paper P reaches the inkjet head41on the most downstream side, the suction port63ais closed. Accordingly, as illustrated inFIG. 6, ink mist blocked by the blocking unit4is collected only by the belt platen11. InFIG. 6, the flow of ink mist is indicated by arrows.

In a state where the belt holes21ain the region near the upstream side of the blocking unit4are not blocked by the paper P, when the suction port63aof the ink mist collection mechanism5is opened, the influence of suction wind by the ink mist collection mechanism5is added to turbulence of the air current due to the suction wind to the belt holes21anear the inkjet head41on the most downstream side, and thus the turbulence of the air current may increase. Accordingly, there is a possibility that ink droplets ejected from the inkjet head41on the most downstream side scatter to cause degradation in the printing image quality. Therefore, the suction port63ais closed when the front edge of the paper P reaches the inkjet head41on the most downstream side and ejection of ink is started from the inkjet head41.

In a state where the front edge of the paper P reaches the downstream end of the chamber29and the belt holes21ain the region near the upstream side of the blocking unit4are blocked by the paper P, as described above, the suction port63ato be opened is opened. Accordingly, as illustrated inFIG. 7, collection of ink mist by the ink mist collection mechanism5is restarted. Accordingly, even in a state where the belt holes21aare blocked by the paper P in a downstream region of the belt platen11and suction of ink mist from the belt holes21ais not performed, ink mist flowing to the downstream side can be collected by the ink mist collection mechanism5. In the example illustrated inFIG. 7, the opening area of the suction port63ais maximum (fully opened).

The collection state of ink mist by the ink mist collection mechanism5as viewed from above is illustrated inFIG. 8. InFIG. 8, the flow of ink mist is indicated by arrows. In the example illustrated inFIG. 8, the central suction port63a(the suction port63aat a position SH2) is opened and the other two suction ports63a(the suction ports63aat positions SH1and SH3) are closed according to the size (paper width) of the paper P.

Here, since the blocking roller51is rotated by following the rotation of the transport belt21during the printing operation, ink mist hardly attaches to the blocking roller51. Therefore, contamination of the paper P by the blocking roller51can be suppressed.

In the period after the front edge of the paper P has reached the downstream end of the chamber29until the front edge of the next paper P reaches the inkjet head41on the most downstream side, the suction port63ato be opened is in an opened state. During this period, collection of ink mist by the ink mist collection mechanism5and collection of ink mist by the belt platen11from the belt holes21athat are not blocked by the paper P are both performed.

As described above, in the inkjet printing device1, ink mist flowing to the downstream side of the inkjet head41is blocked by the blocking unit4, and the blocked ink mist is collected by the ink mist collection mechanism5and the belt platen11. Accordingly, collection of ink mist is performed while suppressing that ink mist flows to the downstream side of the transport unit2. Therefore, ink mist adhering to the guide plates71and72arranged on the downstream side of the transport unit2is reduced. As a result, contamination of the printed material is reduced.

Here, the blocking unit4includes gaps51a, and the ink mist collection mechanism5sucks and collects ink mist blocked by the blocking unit4via the gaps51a. Accordingly, ink mist blocked by the blocking unit4can be easily collected. Further, ink mist can be collected more efficiently by collecting the ink mist blocked by the blocking unit4by the belt platen11on the upstream side of the blocking unit4.

Further, in the inkjet printing device1, the shutter64adjusts the opening area of the suction ports63aaccording to the coverage rate and the head gap. Accordingly, it can be suppressed that the amount of suction wind by the ink mist collection mechanism5increases more than necessary, thereby enabling to decrease degradation in the printing image quality.

Further, in the inkjet printing device1, the shutter64opens and closes the suction port63aaccording to the position in the transport direction of the paper P transported on the belt platen11. Accordingly, it can be suppressed that the influence of suction wind by the ink mist collection mechanism5is added to turbulence of the air current due to the suction wind to the belt holes21ato increase the turbulence of the air current, thereby enabling to decrease degradation in the printing image quality.

Further, in the inkjet printing device1, the respective shutters64open and close the suction port63acorresponding to each of the shutters64according to the size of the paper P. Accordingly, ink mist can be collected efficiently without generating any unnecessary suction wind.

Second Embodiment

A second embodiment in which the blocking unit in the first embodiment described above is modified is described next.FIG. 9is a partial enlarged sectional view of a vicinity of a blocking unit and an ink mist collection mechanism according to the second embodiment.

As illustrated inFIG. 9, a blocking unit4A according to the second embodiment has a configuration in which the blocking sheet52of the blocking unit4according to the first embodiment described above is replaced by an upper blocking roller81.

The upper blocking roller81is a roller that blocks ink mist shifting beyond the blocking rollers51. The upper blocking roller81is arranged above the blocking rollers51and is in contact with the blocking rollers51. The upper blocking roller81is a roller that extends from a front end of the frontmost blocking roller51to a rear end of the rearmost blocking roller51. The upper blocking roller81is rotated by following the rotation of the blocking rollers51.

The blocking unit4A according to the second embodiment blocks ink mist flowing to the downstream side of the inkjet head41during the printing operation, in the same manner as the blocking unit4according to the first embodiment. Ink mist blocked by the blocking unit4A is collected by the ink mist collection mechanism5and the belt platen11.

Accordingly, as in the first embodiment, since collection of ink mist is performed while suppressing that ink mist flows to the downstream side of the transport unit2, ink mist adhering to the guide plates71and72arranged on the downstream side of the transport unit2decreases. As a result, contamination of the printed material can be reduced.

Further, in the second embodiment, since the upper blocking roller81is also rotated together with the blocking rollers51, ink mist hardly adheres to the blocking unit4A. Therefore, contamination of the paper P due to transfer of ink from the blocking unit4A to the paper P can be suppressed.

Other Embodiments

Although the present invention has been described above by reference to the first and second embodiments, it should not be construed that the present invention is limited to the descriptions and the drawings that constitute a part of the present disclosure. On the basis of the present disclosure, various alternative embodiments, practical examples, and operating techniques will be apparent to those skilled in the art.

In the first and second embodiments described above, ink mist blocked by the blocking unit4,4A is collected by the ink mist collection mechanism5and the belt platen11. However, a configuration of collecting ink mist blocked by the blocking unit4,4A is not limited thereto.

For example, the configuration can be such that the transport unit2is of an electrostatic suction type in which the transport unit does not collect ink mist, and ink mist blocked by the blocking unit4,4A is collected only by the ink mist collection mechanism5.

Further, the configuration can be such that, for example, the ink mist collection mechanism5is omitted, and ink mist blocked by the blocking unit4,4A is collected only by the belt platen11. In this case, the blocking unit has a configuration of having no opening (no gap).

Further, a configuration of collecting ink mist on an upstream side of the blocking unit can be provided separately from the transport unit.

In the first and second embodiments described above, the coverage rate and the head gap are used for the adjustment of the opening area of the suction port63a. However, any of these can be omitted. Further, the opening area of the suction port63acan be a fixed value.

Further, in the first and second embodiments described above, when the front edge of the paper P reaches the inkjet head41on the most downstream side, the suction port63ais closed, and when the front edge of the paper P reaches the downstream end of the chamber29, the suction port63ais opened. However, the timing to open or close the suction port63ais not limited thereto. For example, the suction port63acan be closed when the front edge of the paper P reaches the inkjet head41on an upstream side of the inkjet head41on the most downstream side according to a distance between the ink mist collection mechanism5and the respective inkjet heads41.

Further, in the first and second embodiments described above, the blocking unit4,4A is provided with three gaps51a. However, the number of openings (gaps) of the blocking unit is not limited thereto. It suffices that the number of openings of the blocking unit is set to the number corresponding to the length in the main scanning direction of the inkjet head.

Further, in the first embodiment described above, the blocking unit4is configured by the blocking rollers51and the blocking sheet52. In the second embodiment, the blocking unit4A is configured by the blocking rollers51and the upper blocking roller81. However, the configuration of the blocking unit is not limited thereto. It suffices that the blocking unit blocks ink mist.

In is needless to mention that the present invention also includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is to be defined only by the invention specifying mailers according to the scope of claims appropriately obtained from the above descriptions.

This application claims priority based on Japanese Patent Application No. 2018-219354 filed on Nov. 22, 2018, and the entire content of this application is incorporated herein by reference.

REFERENCE SIGNS LIST

1inkjet printing device

5ink mist collection mechanism

61ink mist suction fan