WO2018235378A1

WO2018235378A1 - Ink jet recording apparatus

Info

Publication number: WO2018235378A1
Application number: PCT/JP2018/013557
Authority: WO
Inventors: 崇博有馬; 光雄猪狩; 岡野　守; 宮尾　明
Original assignee: 株式会社日立産機システム
Priority date: 2017-06-20
Filing date: 2018-03-30
Publication date: 2018-12-27
Also published as: CN110382242B; CN110382242A; JPWO2018235378A1; JP7013461B2

Abstract

An ink jet recording apparatus comprises: a nozzle for forming ink particles; a charging electrode for charging the ink particles; a deflecting electrode for deflecting the charged ink particles; a printing head for causing the deflected ink particles to be ejected and printed on a print object; and a collecting member for collecting floating ink, the collecting member being arranged between the printing head and the print object and having an opening part for causing the ink particles ejected from the printing head to pass therethrough.

Description

Ink jet recording device

The present invention relates to an inkjet recording apparatus that ejects ink continuously from a nozzle and performs printing on a print target.

Since the ink jet recording apparatus performs printing by causing the ink to fly from the ink discharge port of the print head, printing can be performed without contact with the medium to be printed. However, when the distance between the print head and the medium to be printed is close, when the ink collides with the medium to be printed, the ink may bounce back to the side of the print head and the surface of the print head may be soiled.

In addition, since the ink that has bounced is charged, it may be attracted to the deflecting electrode inside the print head, which may contaminate the electrode, and the printing quality may be degraded.

As background art for solving this, there exists Unexamined-Japanese-Patent No. 2017-1275 (patent document 1). In this publication, "an ink jet recording apparatus containing a nozzle for discharging ink and performing printing on a medium to be printed, an ink recovery apparatus for recovering floating ink by electrostatic force, the side surface of the print head It is described as “an inkjet recording apparatus characterized by being provided in

JP, 2017-1275, A

In patent document 1, in order to install an ink collection | recovery apparatus in the side surface of a print head, the subject that the installation space of an ink collection | recovery apparatus is needed in the print head side surface occurs.

Therefore, an object of the present invention is to provide an ink jet recording apparatus capable of suppressing the contamination of the print head by the floating ink in a small space.

In order to solve the above problems, as a preferable example of the present invention, a nozzle for forming ink particles, a charging electrode for charging the ink particles, a deflection electrode for deflecting the charged ink particles, and the deflected ink An inkjet recording apparatus comprising a print head for discharging particles to print on a print target, wherein a collecting member for collecting floating ink is disposed between the print head and the print target, and The collection member is an inkjet recording apparatus having an opening through which the ink particles discharged from the print head pass.

According to the present invention, it is possible to obtain an ink jet recording apparatus capable of suppressing the contamination of the print head by the floating ink in a small space.

FIG. 1 is a perspective view showing an appearance of a print head in Embodiment 1. FIG. 2 is a partial cross-sectional view showing an internal configuration of a print head in Embodiment 1. FIG. 6 is a perspective view showing the print head in the first embodiment with the print head cover removed. FIG. 2 is a perspective view showing a print head cover in Embodiment 1. FIG. 6 is a perspective view showing an ink mist collecting member in Example 1; FIG. 1 shows an external perspective view of an inkjet recording apparatus. FIG. 2 is a perspective view showing a use state of the inkjet recording apparatus. It is a conceptual diagram which shows the operation principle of an inkjet recording device. It is a figure explaining the ink mist generating state at the time of printing with an ink jet recording device. 5 is a perspective view showing a positive deflection electrode in Embodiment 1. FIG. FIG. 10 is a perspective view showing a modification of the positive deflection electrode in Embodiment 1. FIG. 7 is a view showing the appearance of a print head in Example 2; FIG. 10 is a partial cross-sectional view showing the configuration and usage of a print head in Example 3; FIG. 14 is a partial cross-sectional view showing the configuration of a print head in Embodiment 4.

Embodiments will be described below with reference to the drawings.

<Configuration of device appearance>
FIG. 6 is an external perspective view of the inkjet recording apparatus 400 according to the first embodiment.
In FIG. 6, 1 is an ink jet recording apparatus main body, 2 is a print head, 3 is an operation display unit, and 4 is a conduit. The inkjet recording apparatus 400 includes the operation display unit 3 in the inkjet recording apparatus main body 1 and the print head 2 outside, and the inkjet recording apparatus main body 1 and the print head 2 are connected by a conduit 4.

<Use form of device>
Next, the usage state of the ink jet recording apparatus 400 will be described with reference to FIG.
In FIG. 7, 1 is an inkjet recording apparatus main body, 2 is a print head, 4 is a conduit, 13 is a print object on which numbers and characters are printed, 15 is a belt conveyor for transporting the

print object

13 and 16 is a belt conveyor 15 And 17, a print sensor.

The inkjet recording apparatus 400 is installed on a production line in a factory where, for example, food and beverages are produced, the main body 1 is installed at a position where the user can operate, and the print head 2 is on a production line such as a belt conveyor 15 Is placed at a position where it can be close to the print target 13 to be fed.

In order to print on the production line such as the belt conveyor 15 with the same width regardless of the feeding speed, the rotary encoder 16 which outputs a signal corresponding to the feeding speed to the ink jet recording apparatus or the printing object 13 is detected. A print sensor 17 for outputting a signal instructing printing to the ink jet printing apparatus is installed, and each is connected to a control unit (not shown) in the main body 1.

The control unit controls the charge amount and charge timing of the ink particles 7C discharged from the nozzle 8 according to the signals from the rotary encoder 16 and the print sensor 17, while the print object 13 passes near the print head 2. Printing is performed by causing the charged and deflected ink particles 7C to adhere to the printing object 13.

<Operation principle of device>
Next, the operation principle of the ink jet recording apparatus will be described with reference to FIG.
In FIG. 8, 18 is a main ink container, 7A is an ink, 24 is a pump (for supply) which pressurizes and discharges the ink, 9 is an electrostrictive element vibrating at a predetermined frequency when a voltage is applied, and 8 discharges the ink. The nozzle 7B is an ink column. 10 is a charging electrode for charging ink particles, 7C is an ink particle, 11 is a ground deflection electrode, 12 is a positive deflection electrode, 13 is a printing object to be printed, and 14 is a gutter for recovering ink particles not to be printed.

The ink 7A in the main ink container 18 is sucked and pressurized by a pump (for supply) 24 and is ejected from the nozzle 8 as an ink column 7B. The nozzle 8 is provided with an electrostrictive element 9, and the ink is vibrated at a predetermined frequency to make the ink column 7B discharged from the nozzle 8 into particles. The number of ink particles 7C generated thereby is determined by the frequency of the excitation voltage applied to the electrostrictive element 9, and is the same as the frequency. The ink particles 7 </ b> C can be charged by applying a voltage of a magnitude corresponding to printing information to the charging electrode 10.

The ink particles 7 C charged by the charging electrode 10 fly in the electric field between the ground deflection electrode 11 and the plus deflection electrode 12. A deflection electric field is formed between the plus deflection electrode 12 to which a high voltage of 1 to 7 kV is applied and the ground deflection electrode 11 installed, and the charged ink particles 7C have a force proportional to their charge amount. It receives and deflects, flies toward the print target 13, and lands.

At this time, the landing position of the ink particles 7C changes in accordance with the amount of charge, and the production line moves the printing object 13 in the direction orthogonal to the deflection direction, thereby making the ink particles 7C orthogonal to the deflection direction. The particles can be made to land, and characters are formed by the plurality of landed ink particles 7D to perform printing. The ink particles 7C not used for printing fly linearly between the positive deflection electrodes 12, are captured by the gutter 14, and then are sucked by the pump (for recovery) 25 and recovered into the main ink container 18.

<Print Head Configuration of Example 1>
The configuration of the print head 2 of the ink jet recording apparatus 400 according to the first embodiment will be described with reference to FIGS. 1 (a) is an external perspective view of the print head 2 of the present embodiment, and FIG. 1 (b) is an external perspective view of the print head 2 with the collecting member holder 41 removed. 2 (a) shows a partial cross-sectional view of the print head 2 of this embodiment, FIG. 2 (b) shows an enlarged view of a portion D of FIG. 2 (a), and FIG. 3 removes the head cover 60 of this embodiment. The perspective view of the print head 2 of a state is shown.

4 (a) shows a perspective view of the head cover 60 of the present embodiment, FIG. 4 (b) shows a perspective view in which the angle is changed so that the inside of the head cover 60 can be seen, and FIG. The perspective view of the collection member holder 41 of an Example is shown, FIG.5 (b) shows the perspective view of the state which isolate | separated the collection member holder 41 and the collection member 42. FIG.

1 to 3, in the print head 2, a nozzle 8 for discharging ink, a charging electrode 10 disposed in parallel and symmetrically with the ink particle 7C discharged from the nozzle 8 as a center, and an ink particle 7C. A gutter 14 is provided coaxially with the ink particles 7C and having a hole 14a for capturing ink particles 7c not used for printing.

The nozzle 8, the charging electrode 10, the ground deflection electrode 11 and the plus deflection electrode 12, and the gutter 14 are disposed on the head base 50. Further, the head base 50 is assembled with a proximity sensor 71 that reacts when the magnet 61 is nearby. The ink mist suction unit 51 is attached to the head base 50.

The ink mist suction portion 51 is connected to the positive deflection electrode 12 through the connection portion 51A, and is the same component in this embodiment. Therefore, a high voltage of 1 to 7 kV is applied to the ink mist suction portion 51 in the same manner as the positive deflection electrode 12. In the present embodiment, the positive deflection electrode 12 and the ink mist suction unit 51 are described using the same components and the same power supply. However, different components may be used and the separate power supplies may be used.

Next, in FIGS. 1 to 4, the print head 2 is assembled with a protective cover 70 for the purpose of protecting internal components of the print head 2 (not shown). When the protective cover 70 is assembled, the space enclosed by the head base 50 and the protective cover 70 is protected from an impact or the like during maintenance. The parts enclosed by the protective cover 70 are areas for maintenance by so-called service personnel. Further, a head cover fixing screw 72 for fixing the head cover 60 is assembled to the protective cover 70.

Further, in the print head 2, a head cover 60 is assembled for the purpose of protecting the nozzle 8, the charging electrode 10, the ground deflection electrode 11, the positive deflection electrode 12, and the gutter 14. The head cover 60 is made of stainless steel, and in a state of being assembled to the print head 2, is in a state of being electrically grounded. Such a head cover 60 is formed with a cutout so as to be fitted with the head cover fixing screw 72 of the protective cover 70, and a slit 60A through which the ink particles 7C used for printing pass. The head cover 60 is fixed to the head base 50 using a head cover fixing screw 72, and the head cover 60 can be detached from the print head 2 by loosening the head cover fixing screw 72.

Further, the magnet 61 is assembled to the head cover 60, and the proximity sensor 71 responds when the magnet 61 approaches and can determine whether the head cover 60 is assembled at a proper position. When the head cover 60 is removed from the print head 2, control is performed to turn off the high voltage (1 to 7 kV) applied to the positive deflection electrode 12 and the ink mist suction portion 51 for safety.

An insulating cover 62 is attached to the head cover 60 in order to prevent the ink mist suction portion 51 from being exposed to the outside of the print head 2. The insulating cover 62 protrudes from the head cover 60, and the ink mist suction portion 51 is inserted into the recess inside the insulating cover 62. As a result, the tip of the ink mist suction portion 51 protrudes near the outer wall of the head cover 60 or outside of the outer wall, and the electric field generated by the ink mist suction portion 51 affects the print head 2 to the outside.

The concave portions on the inner side of the ink mist suction portion 51 and the insulating cover 62 are not in contact with each other, and the insulating property is enhanced through a certain space. The material of the insulating cover 62 is a fluorocarbon resin (e.g., PTFE) to improve water repellency.

As a result, even when used in a high humidity environment, the surface of the insulating cover 62 is unlikely to be connected by the condensation liquid, and the insulation can be maintained. The material of the insulating cover 62 is a fluorine-containing resin, even when a surface treatment such as coating with a fluorine resin is performed using a resin such as polyphenylene sulfide resin (PPS) or polybutylene terephthalate resin (PBT) as a material. It becomes possible to acquire the same effect as the case where system resin is used for material.

In FIGS. 1 to 5, the collecting member holder 41 is fixed to the head cover 60 using the collecting member holder fixing screw 73. The collecting member holder 41 has a fixing portion 41B cut out so as to fit with the collecting member holder fixing screw 73, a slit 41A for passing the ink particles 7C used for printing, and a convex portion of the insulating cover 62. A recess 41C is formed to be fitted to fit. The slit 41A is assembled so as to be at the same position as the slit 60A of the head cover 60.

Then, the collecting member holder 41 can fix the collecting member 42 on the outer side in the traveling direction of the ink particles 7C. Like the head cover 60 and the collection member holder 41, the collection member 42 forms a slit 42A through which the ink particles 7C used for printing pass. The collection member 42 is assembled to the collection member holder 41 such that the slit 42A of the collection member 42 is at the same position as the slit 41A of the collection member holder 41.

One side of the collection member 42 is a sealed sheet that is glued, and the glued surface is attached to the collection member holder 41 so as to be fixed. Further, the collection member 42 does not have to be stuck to the seal paper, and the collection member 42 may be fixed to the collection member holder 41 by pinching or screwing. The material of the collection member 42 is not particularly limited as long as the ink adheres, such as paper, a resin plate, or metal.

<Configuration of Ink Mist Suction Unit of First Embodiment>
The configuration of the ink mist suction unit 51 and the positive deflection electrode 12 of the first embodiment will be described with reference to FIG. In FIG. 10, the positive deflection electrode 12 has a connecting portion 51A at a portion which does not affect the deflection electric field for deflecting the ink particles 7C formed together with the ground deflection electrode 11 in the assembled state to the print head 2. The connection portion 51A is connected to the ink mist suction portion 51. The ink mist suction portion 51 protrudes toward the gutter 14 side more than the tip end of the plus deflection electrode 12 in the assembled state to the print head 2. This makes it possible to form an electric field for collecting the ink mist 31 outside the print head 2.

Such a surface of the ink mist suction portion 51 may be covered with an insulator in the range of E shown by a dotted oval in FIG. For example, the surface of the ink mist suction portion 51 is coated with an insulator. For example, a fluorocarbon resin is applied to the surface of the ink mist suction portion 51 and dried and fixed, or a thermoplastic insulator is injected and filled around the ink mist suction portion 51 by insert molding and cooled and solidified.

With this configuration, the electric field between the head cover 60 and a portion near the tip of the ink mist suction portion 51 becomes large, and the electric field between the head cover 60 is increased. When a large electric field is generated, generation of corona discharge can be suppressed by replacing the air in the vicinity of the surface with an insulator. As a result, even if the insulating cover 62 is eliminated, for example, there is no concern that the high voltage portion may be exposed to the outside of the print head 2 to cause an electric shock.

The tip of the positive deflection electrode 12 may be extended to the recess of the insulating cover 62 in the ink discharge direction of the nozzle 8, and the ink mist suction portion 51 may be formed there.

A modification of the ink mist suction unit 51 will be described with reference to FIG. In FIG. 11, the positive deflection electrode 12 is connected to the ink mist suction unit 52 via the connection unit 52A. The ink mist suction unit 52 is provided with a cut-out opening 52B. If a part of the floating ink mist 31 intrudes into the inside of the print head 2, the ink mist 31 may adhere to the ink mist suction portion 52 due to the influence of the electric field. By providing them, it is possible to prevent the ink mist 31 from being concentrated and deposited in one place, and to prevent the deflection electric field of the ink particles 7C from being affected.

<Operation of Embodiment 1>
The usage of the ink jet recording apparatus 400 according to the first embodiment will be described with reference to FIG. FIG. 9 is a view showing a state of ink mist generation when printing is performed by the inkjet recording apparatus 400, and illustrates a state in which printing is performed on the surface of the printing object 13 by the inkjet recording apparatus. The print object 13 is transported in the B direction at a position facing the fixed print head 2, whereby characters, symbols, etc. are printed on the upper side of the print object 13.

At this time, depending on the speed of the ink particles discharged from the slit 60A of the print head 2 and the distance between the print head 2 and the surface of the print object 13, some of the landed ink particles 7D that land on the print object 13 may bounce off. is there. In addition, the ink which bounces is in the form of mist, and the ink mist 31 which is the floating ink is generated. The amount of the ink mist 31 lands so that the landed ink particles 7D overlap with each other before drying as the distance between the landed ink particles 7D decreases, and the amount of ink rebounding increases, so the amount of the ink mist 31 The generation amount also increases.

When the distance between the print head 2 and the print object 13 is short, the ink mist 31 charged in the print head 2 is affected by the air flow at the time of ink rebound and the electric field by the ink mist suction unit 51. It easily adheres to the collection member 42 held by the Dirt adheres to the surface of the collection member 42 due to the ink mist 31 rebounded from the landed ink particles 7 D, but the stain is biased toward the transport direction of the printing object 13. With such a configuration, it is possible to prevent or reduce the contamination of the print head 2 by the floating ink mist 31.

Since the collection member 42 used in the present embodiment gradually becomes contaminated with the ink by capturing the ink mist 31, it needs to be periodically replaced or cleaned. The collection member 42 to which the ink mist 31 adheres loosens the collection member holder fixing screw 73 and removes the collection member holder 41 from the print head 2, and in that state, collects the collection member 42 which is a seal sheet. It can be removed from 41 and replaced with a new collection member 42. Thereafter, by fixing the collecting member holder 41 to which the new collecting member 42 is attached to the print head 2, it is possible to reduce the contamination of the print head 2 with the ink mist 31.

<Effect of Example 1>
As described above, according to the present embodiment, by causing the floating ink mist 31 to adhere to the collection member 42, it is possible to suppress the inside and the outside of the print head 2 from being soiled by the ink. In addition, since the configuration for collecting the ink mist 31 can be installed integrally with the print head 2, it can be realized in a smaller and smaller installation space. Furthermore, it is possible to provide an inkjet recording apparatus 400 capable of easily replacing the collection member 42 that needs periodic replacement.

The invention according to the second embodiment will be described below with reference to the drawings. The description of the parts common to the first embodiment is omitted, and the parts different from the first embodiment will be mainly described.

<Print Head Configuration of Example 2>
An embodiment of an ink jet recording apparatus 400 according to a second embodiment of the present invention will be described with reference to FIG. 12 (a) shows an external perspective view of the print head 2A of this embodiment, FIG. 12 (b) shows a front view of the print head 2A of this embodiment, and FIG. 12 (c) shows this embodiment. Fig. 3 shows a side view of an example print head 2A.

In FIG. 12, the extended collection member holder 44 is fixed to the head cover 60 using the collection member holder fixing screw 73. The extended collecting member holder 44 has a plurality of fixing portions 44B cut out so as to fit with the collecting member holder fixing screw 73, a slit 44A through which the ink particles 7C used for printing pass, and an insulating cover 62 The recess 44C is formed so as to be fitted to the projection of the The slit 44A is assembled so as to be at the same position as the slit 60A of the head cover 60. Further, the extended collection member holder 44 is configured to include an alignment portion 44D for pressing the side surface of the head cover 60 to fix an angle in order to stabilize the fixed position.

<Operation of Embodiment 2>
The extended collecting member holder 44 used in the present embodiment loosens the collecting member holder fixing screw 73, removes the extended collecting member holder 44 from the print head 2, and changes it to another alignment portion 44D to print It is possible to adjust the distance between the object 13 and the extended collection member holder 44 over a plurality of pieces. As the distance between the print object 13 and the extended collection member holder 44 is shorter, more ink mist 31 can be attached to the extended collection member holder 44, so the area around the print head 2A is contaminated with the ink mist 31. Can be reduced.

The contamination due to the ink mist 31 attached to the extended collection member holder 44 can be easily cleaned with a solvent such as methyl ethyl ketone (MEK) or ethanol, so the same one can be used any number of times.

Further, the extended collecting member holder 44 attaches the collecting member 42 to the extended collecting member holder 44 in the same manner as the first embodiment, so that the ink mist 31 is adsorbed by the collecting member 42 and the ink mist 31 is formed. By periodically replacing the dirty collection member 42, it is also possible to adopt a method of reducing the contamination of the print head 2A and the ink mist 31 around it.

<Effect of Example 2>
According to the present embodiment, in addition to the effect of the first embodiment, the distance between the extended collection member holder 44 and the collection member 42 attached to the print head 2A and the printing object 13 is adjusted over a plurality of objects. Accordingly, it is possible to provide the inkjet recording apparatus 400 capable of further reducing the contamination of the print head 2A with the ink mist 31 and the contamination to peripheral equipment.

The invention according to the third embodiment will be described below with reference to the drawings. The description of the parts common to the first and second embodiments will be omitted, and the parts different from the first and second embodiments will be mainly described.

<Print Head Configuration of Example 3>
An embodiment of an ink jet recording apparatus 400 according to a third embodiment of the present invention will be described with reference to FIG. FIG. 13 is a partial cross-sectional view showing the configuration and usage of the print head in the third embodiment.

13, the print head 2B includes a head cover 64, a tapered collecting member holder A46 fixed to the head cover 64 using a head cover fixing screw 72, and a collecting member 47 fixed to the tapered collecting member holder A46. ing. The head cover 64 is diagonally connected in a direction that reduces the space inside the print head 2B at a slit 64A through which the ink particles 7C used for printing pass and a plane perpendicular to the deflection direction of the ink particles 7C used for printing. A taper B portion 64C connected in the direction of the head base 50 and a taper A portion 64B connected in the opposite direction to the head base 50 are formed.

Then, the tapered collection member holder A 46 is engaged with the taper B portion 64C of the head cover 64 at a plane perpendicular to the slit 46A through which the ink particles 7C used for printing pass and the deflection direction of the ink particles 7C used for printing. A taper D portion 46C and a taper C portion 46B fitted with the taper A portion 64B of the head cover 64 are formed.

The collecting member 47 is made of a material such as sealing paper and is assembled in conformity with the shapes of the slit 46A, the tapered C portion 46B and the tapered D portion 46C of the tapered collecting member holder A46. Therefore, in the present embodiment, the passing position of the ink particles 7C used for printing of the print head 2B is the position closest to the printing object 13.

<Operation of Embodiment 3>
Next, the usage mode and operation of the print head 2B will be described. In FIG. 13, the belt conveyor 15 carrying the print object 13 flows in the direction of the arrow of the conveyor flow 101. Thereby, the print object 13 is flowing in the direction of the print object moving direction 102. Therefore, an air flow 103 is generated around the print head 2B due to the movement of the belt conveyor 15 and the print object 13.

The air flow 103 is a flow that reduces the inflow of the ink mist 31 into the inside of the print head 2B, so that the ink contamination of the print head 2B can be reduced.

<Effect of Example 3>
According to the present embodiment, in addition to the effects of the first embodiment, the printing object is provided by providing a taper portion in the shape of the head cover 64 attached to the print head 2B, the taper collecting member holder A46, and the collecting member 47. It is possible to provide the inkjet recording apparatus 400 capable of reducing the ink contamination of the print head 2B due to the ink mist 31 by the air flow 103 by the flow of 13.

The invention according to the fourth embodiment will be described below with reference to the drawings. The description of the parts common to the first to third embodiments is omitted, and the parts different from the first to third embodiments will be mainly described.

<Print Head Configuration of Example 4>
An embodiment of an ink jet recording apparatus 400 according to the fourth embodiment of the present invention will be described with reference to FIG. FIG. 14 is a partial cross-sectional view showing the configuration of the print head in the fourth embodiment.

In FIG. 14, the print head 2 </ b> C includes a head cover 66, a tapered collecting member holder B 48 fixed to the head cover 66, and a collecting member 49 fixed to the tapered collecting member holder B 48. The head cover 66 includes a slit 66A through which the ink particles 7C used for printing pass, a taper F portion 66C obliquely connected to the ground deflection electrode 11 side to reduce a space inside the print head 2B, and an inner portion of the print head 2B. A taper E portion 66B obliquely connected to the positive deflection electrode 12 side is formed so as to reduce the space.

The tapered collecting member holder B48 has a slit 48A through which the ink particles 7C used for printing pass, a tapered H portion 48C fitted with the tapered F portion 66C of the head cover 66 on the side of the ground deflection electrode 11, and a positive deflection electrode A tapered G portion 48B fitted with the tapered E portion 66B of the head cover 66 is formed on the 12 side. The collection member 49 forms a slit 49A and is made of a material such as sealing paper and assembled in conformity with the shapes of the slit 48A, taper G portion 48B and taper H portion 48C of the tapered collection member holder B48. It is supposed to be. Therefore, in the present embodiment, the passing position of the ink particle 7C used for printing of the print head 2C is the position closest to the printing object 13.

In addition, the print head 2C includes an ink mist suction unit 54. The ink mist suction portion 54 forms a tip portion 54 B accommodated in the head cover 66 and a connection portion 54 A for connecting to the plus deflection electrode 12. The tip portion 54 B of such an ink mist suction portion 54 protrudes in the direction of the gutter 14 from the tip of the plus deflection electrode 12.

<Operation of Embodiment 4>
In the print head 2C, the ink mist 31 may intrude into the head cover 66 through the slits 66A. In the head cover 66, there are the ground deflection electrode 11, the positive deflection electrode 12, and the ink mist suction portion 54, and there is an electrostatic field formed by these. Since the charged ink mist 31 is attracted to the ink mist suction unit 54, it can be prevented from adhering to or depositing on the tip end portion of the positive deflection electrode 12 and the like to prevent the ink particle 7C used for printing from flying.

In addition, by making the gutter 14 side of the print head 2C tapered so as to be thin, it becomes possible to get closer to the print object 13, which makes it possible to improve the printing quality and print small characters. .

<Effect of Example 4>
According to this embodiment, in addition to the effects of Embodiments 1 to 3, the tip of the print head 2C can be miniaturized by attaching the ink mist suction unit 54 to the inside of the print head 2C. Thus, it is possible to provide an inkjet recording apparatus 400 capable of bringing the print head 2C closer to the print object 13.

The present invention is not limited to the embodiments described above, but includes various modifications. Further, the above-described embodiments are described in detail to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described.

Reference Signs List 1 main body 2 print head 41 collecting member holder 42 collecting member 44 extended collecting member holder 46 taper collecting member holder A 48 taper collecting member holder B 51 Ink mist suction unit, 51A ... connection unit, 400 ... ink jet recording apparatus

Claims

It has a nozzle for forming ink particles, a charging electrode for charging the ink particles, a deflection electrode for deflecting the charged ink particles, and a print head for discharging the deflected ink particles to print on an object to be printed In the inkjet recording device,
A collection member for collecting floating ink is disposed between the print head and the print target, and
The said recording member has an opening part which lets the said ink particle discharged from the said printing head pass, The inkjet recording device characterized by the above-mentioned.
The inkjet recording apparatus according to claim 1, wherein the collecting member supporting portion for supporting the collecting member is removed from the print head, and the distance between the collecting member supporting portion and the printing object can be adjusted. An inkjet recording apparatus characterized in that
The inkjet recording apparatus according to claim 1, wherein the collection member is a seal sheet, and is replaced by replacing the collection member supporting portion supporting the collection member.
The inkjet recording apparatus according to claim 1, wherein the collection member support portion supporting the collection member has a taper, and the collection member support portion is an opening of the print head discharging the ink particles. An inkjet recording apparatus characterized in that the periphery of a hole is closest to the object to be printed.
The ink jet recording apparatus according to claim 1, wherein the collection member and the collection member supporting portion for supporting the collection member have a taper, and the ink for suctioning the floating ink to the print head An inkjet recording apparatus having a suction unit.
The ink jet recording apparatus according to claim 1, wherein the print head includes an ink suction unit that suctions the floating ink connected to the deflection electrode.
7. The ink jet recording apparatus according to claim 6, wherein the ink suction unit has an opening.
7. The ink jet recording apparatus according to claim 6, wherein the ink suction unit covers an end portion in proximity to the print head with an insulating cover.
The ink jet recording apparatus according to claim 8, wherein the ink suction unit is not in contact with the insulating cover.
9. The ink jet recording apparatus according to claim 8, wherein the surface of the insulating cover is covered with a fluorine-based resin in order to enhance water repellency.