WO2019064756A1 - Dispositif d'impression à jet d'encre - Google Patents

Dispositif d'impression à jet d'encre Download PDF

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Publication number
WO2019064756A1
WO2019064756A1 PCT/JP2018/023995 JP2018023995W WO2019064756A1 WO 2019064756 A1 WO2019064756 A1 WO 2019064756A1 JP 2018023995 W JP2018023995 W JP 2018023995W WO 2019064756 A1 WO2019064756 A1 WO 2019064756A1
Authority
WO
WIPO (PCT)
Prior art keywords
ink
flow path
print head
recording apparatus
head cover
Prior art date
Application number
PCT/JP2018/023995
Other languages
English (en)
Japanese (ja)
Inventor
孝磨 佐藤
石井　英二
毎明 高岸
加藤　学
原田　信浩
Original Assignee
株式会社日立産機システム
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社日立産機システム filed Critical 株式会社日立産機システム
Publication of WO2019064756A1 publication Critical patent/WO2019064756A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/07—Ink jet characterised by jet control
    • B41J2/075—Ink jet characterised by jet control for many-valued deflection
    • B41J2/08—Ink jet characterised by jet control for many-valued deflection charge-control type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads

Definitions

  • the present invention relates to an ink jet recording apparatus, and more particularly to a technology relating to a print head structure.
  • Patent Document 1 ink is sprayed from an ink jet nozzle disposed around the drum to form a printable on a print medium held on the drum and rotating with the drum, and the drum is generated along with the drum rotation.
  • An ink jet printer has been described which is provided with flow relief means for reducing circumferential air flow.
  • Patent Document 1 In the ink jet printer described in Patent Document 1, it is considered possible to improve the print quality by reducing the air force received by the flying ink particles. However, no mention is made of preventing ink particles from flowing into the print head. Further, in Patent Document 1, since there is a distance between the print head and the flow relaxation plate, it is considered that an air flow in the circumferential direction still exists near the print head, and a high pressure area is generated between the print head and the print target An air flow toward the inside of the head may be generated.
  • An object of the present invention is to provide an ink jet recording apparatus capable of reducing the amount of ink particles flowing into the inside of a print head.
  • a nozzle for separating ink particles, a charging electrode for charging ink particles, a deflection electrode for deflecting charged ink particles, and deflected ink particles An ink jet recording apparatus comprising: a print head cover having an ink particle passage hole for discharging an object to be printed, wherein the flow path reduction portion reduces a flow path formed between a tip of the print head cover and the print object
  • the flow path reduction portion is an ink jet recording apparatus having a projecting shape in which the cross-sectional area closer to the ink particle passage hole is larger than the cross-sectional area farther from the ink particle passage hole.
  • an ink jet recording apparatus capable of reducing the amount of ink particles flowing into the inside of the print head.
  • FIG. 2 is a view showing the concept of behavior of ink particles in an inkjet recording apparatus according to an embodiment.
  • FIG. 2 is a view showing the printing principle in the inkjet recording apparatus. The figure explaining the mechanism of ink mist generation.
  • FIG. 2 is a cross-sectional view of a print head including a flow path reduction unit.
  • FIG. 2 is a view showing a flow path reduction unit of the first embodiment.
  • FIG. 6 is a view showing a flow path reduction unit of a second embodiment.
  • FIG. 16 is a view showing the back surface of the flow path reduction part of the second embodiment.
  • FIG. 7 is a view showing a print head cover of a flow path reduction unit according to a second embodiment.
  • FIG. 7 is a view showing a flow path reduction unit of a third embodiment.
  • FIG. 1 is a schematic view of the internal structure of a print head and the behavior of ink particles in a continuous jet charge control type ink jet recording apparatus according to an embodiment.
  • the ink 101 pressurized by the pressurizing pump is continuously discharged from the nozzle 102.
  • a piezo element is built in the nozzle 102 and excites the ink at a predetermined frequency.
  • the ink column ejected from the nozzle has a periodic initial necking.
  • the constriction grows by surface tension as it goes downstream, and separates into ink particles 103 due to the energy instability of the ink column surface.
  • the potential of the charging electrode 104 is controlled to continuously generate charged particles 105 used for printing indicated by white circles in the drawing and non-charged particles 106 indicated by black circles.
  • the separated ink particles then fly between the deflection electrodes 107a and 107b.
  • a predetermined potential difference is applied between the deflection electrodes 107a and 107b.
  • the charged particles 105 receive an electric force 108 indicated by an arrow in the figure to be deflected by an electric field formed between the deflecting electrodes 107a and 107b, and travel along the trajectory indicated by a dotted curve 109 toward the printing object. .
  • the landing height of the charged particles 105 on the printing object is changed by controlling the potential of the charging electrode 104 in synchronization with the excitation frequency of the piezoelectric element. Can. Further, in the continuous jet type ink jet printer, particles are continuously generated in accordance with the excitation frequency, but printing is not performed using all the generated particles. The particles not used for printing are non-charged particles 106, and the particles are made to go straight and collected by the gutter 110 and reused.
  • FIG. 2 shows the printing principle in the continuous jet charge control type ink jet recording apparatus.
  • the print head cover 201 does not show the front surface of the cover structure on the front side of the drawing for the sake of explanation.
  • the internal structure is also simplified, and only the deflection electrodes 107a and 107b are shown.
  • the charged particles 105 are deflected by the electric field formed by the deflecting electrodes 107 a and 107 b and fly along the charged particle trajectories 109. Thereafter, the ink droplet passes through the ink particle passage holes 202 provided in the print head cover 201 and lands on the print target object 203.
  • the amount of deflection of the charged particles 105 changes in accordance with the given amount of charge. Therefore, by changing the amount of charge applied to the charged particles 105, it is possible to change the charged particle trajectory 109 two-dimensionally and control the impact position on the printing object 203.
  • FIG. 2 shows an example of printing the letter "A”. Further, the moving direction of the printing object may be opposite to that of the arrow 204.
  • the hatched oval 206 indicates the landed ink particle position, and the dotted oval 207 indicates the not landed ink particle landing position.
  • FIG. 3 shows the mechanism of ink mist generation, and is a cross-sectional view across the deflecting electrodes 107a and 107b and the ink particle passage hole 202 from the alternate long and short dash line AA in FIG.
  • mist group 302 Since a part of the ink mist group 302 has a velocity component in the direction from the print object 203 toward the print head cover 201 as indicated by the arrow 301, the mist group 302a attached to the outer surface of the print head cover 201 A mist group 302 b is generated which passes through 202 and enters the inside of the print head. Since the mist group 302b adheres to the internal structure of the print head and the deflection electrodes 107a and 107b and the like and is dried, it is necessary to frequently perform maintenance such as cleaning of the print head.
  • FIG. 4 is a view schematically showing the results of airflow analysis around the print head cover 201 and the printing object 203 in FIG. 2, and is shown as a cross section across the ink particle passage hole 202 from the dashed dotted line BB in FIG. ing. Note that the deflection electrodes 107a and 107b are omitted, a velocity wall boundary having a direction indicated by the arrow 204 is given to the surface of the print object 203, and a non-slip velocity 0 boundary is given to the surface of the print head 201 to create an analytical model. The analysis was done.
  • a flow velocity distribution 402 similar to Couette flow is formed in the vicinity of the dotted line area 401 formed between the tip end portion 201a of the print head cover 201 and the surface of the printing object 203.
  • the arrows in the flow velocity distribution 402 indicate the flow direction of the air flow, and the length of the arrow 402 indicates the size of the air flow velocity.
  • the air flow collides with the upstream side surface 201 b of the print head cover 201 and stagnates, and a high pressure area 403 is generated.
  • the high pressure area 403 extends to the vicinity of the ink particle passage hole 202, and the inside of the print head 404 is substantially atmospheric pressure and lower in pressure than the high pressure area 403, so the components in the direction 405 from the high pressure area 403 toward the inside of the print head 404 An air flow is generated. Therefore, the ink mist group 302 described with reference to FIG. 3 is in a state in which the ink mist can easily enter the inside of the print head 404 as it travels toward the inside.
  • Example 1 to Example 3 will be described based on the drawings.
  • FIG. 5 shows a cross section across the ink particle passage hole 202 from the alternate long and short dash line BB in FIG.
  • a flow path reduction portion 501 is provided on the front end portion 201 a of the print head cover 201 located on the upstream side of the print object moving direction 204 and in the region on the upstream side of the ink particle passage hole 202. It is characterized in that the area formed between the print head cover front end portion 201 a and the surface of the print object 203, that is, the flow path is reduced. With this configuration, by reducing the pressure in the downstream region of the flow path reduction portion 501, the air flow flowing into the inside of the print head through the ink particle passage hole 202 is reduced.
  • the principle of reducing the pressure by the flow path reduction unit 501 will be described with reference to the two-dimensional cross section of FIG. 5.
  • the fluid around the print head may be regarded as air, and the moving speed of the printing object 203 is at most several tens of m / s, so as an incompressible fluid You can think about it.
  • the cross-sectional area of the flow channel contraction start cross section 502 of the flow channel contraction portion 501 is A1
  • the pressure is P1
  • the flow velocity is V1
  • the cross sectional area of the flow channel contraction end cross section 503 is A2
  • the pressure is P2
  • the flow velocity is V2.
  • the flow channel is rapidly expanded, so that the flow is separated, and the low pressure region is further expanded. Therefore, if the pressure in this low pressure region is lower than the atmospheric pressure which is the pressure in the print head interior 404, an air flow can be generated which flows out from the print head interior 404 through the ink particle passage holes 202.
  • FIG. 6 schematically shows the result of air flow analysis similar to that of FIG. 4 performed on the structure provided by the present embodiment.
  • the air flow collides against the upstream side surface 201b of the print head cover 201 and stagnates, and a high pressure area 601 is generated.
  • the area 602 on the downstream side of the flow path reduction section 501 is reduced in pressure by the effect of installing the flow path reduction section 501.
  • the pressure in the low pressure region 602 is lower than the atmospheric pressure which is the pressure in the print head interior 404, an air flow having a component in the direction 603 from the print head interior 404 toward the low pressure region 602 is generated.
  • FIG. 7 shows the pressure distribution obtained by the airflow analysis results of each of the conventional structure without the flow path reduction portion shown in FIG. 4 and the structure provided by this embodiment having the flow path reduction portion shown in FIG. .
  • This pressure distribution is the same as the structure shown in FIG. 4 in the conventional structure without the flow path reduction portion, and the structure of Example 1 having the flow path reduction portion shown in FIG. It is acquired above.
  • the pressure is equal to atmospheric pressure.
  • the pressure rises from before the print head cover outer surface position, and the pressure becomes higher than the atmospheric pressure until it reaches the print object surface position C '.
  • the pressure drops sharply from before the print head cover outer surface position, and becomes lower than the atmospheric pressure until reaching the print object surface position D '. Therefore, by providing the flow path contraction portion, it is possible to reduce the air flow flowing into the inside of the print head and to suppress the internal contamination due to the ink mist.
  • the flow channel contraction start cross section 502 of the flow channel contraction portion 501 in FIG. 5 is set on the upstream side of the print object moving direction 204 from the ink particle passage holes 202 and the channel contraction completion cross section 503, and the flow channel contraction completion cross section It is assumed that 503 is set upstream of the ink particle passage hole 202. Further, the shape of the flow path contraction portion 501 can be arbitrarily designed as long as the pressure in the low pressure region 602 in FIG. 6 is lower than the atmospheric pressure and an air flow in the direction of arrow 603 flowing through the ink particle passage hole 202 is generated.
  • the cross-sectional shape of the flow path reduction portion 501 in the depth direction of the drawing may be constant or may be changed.
  • reduction part 501 may be comprised not with a single member but with multiple members.
  • the flow path reduction unit 501 is disposed downstream of the ink particle passage hole 202 in the print object moving direction 204 so as to exert an effect even when the print object moving direction 204 in FIG. 5 is reversed. It may be removable by using a magnet, a slider or the like as required.
  • the reduction start position of the flow path reduction portion 801 is the print head cover tip end portion 201a upstream of the print object moving direction 204, and the reduction end position is the position of the longitudinal wall 202c of the ink particle passage hole 202.
  • the start position 801a of the flow passage contraction portion 801 is set as the end surface 202a of the ink particle passage hole 202, and the end position 801b of the flow passage contraction portion 801 as the end surface 202b of the ink particle passage hole 202 It is an embodiment configured.
  • the flow path reduction portion 801 has a width equal to or greater than the length of the wall surface in the longitudinal direction of the ink particle passage hole 202, and reduces the air flow flowing into the print head through the ink particle passage hole 202.
  • the shape of the flow path contraction portion 801 has a projecting shape in which the cross section of the flow path contraction portion 801 becomes larger as the ink particle passage hole 202 is approached.
  • all are formed in a plane and become a triangular prism, but the constituent surface may be a curved surface.
  • the flow path reduction portion 801 can be configured integrally with the print head cover 201, but the height 802 in the direction perpendicular to the print head cover 201 of the flow path reduction portion 801 is the length of the ink particle passage hole 202.
  • the desired low-pressure reduction effect is obtained by designing the length to be greater than the length of the short direction perpendicular to the direction (in the direction of the shorter side of the sides configuring the ink particle passage hole 202, the moving direction of the printing object). I can expect it.
  • FIG. 9 shows an embodiment in which the flow path reduction section 901 is fixed to the print head cover 201 using a slider type structure.
  • the flow path reduction portion 901 is formed in a curved shape, and the end face 901 a is printed on the upper surface 201 c of the print head cover 201 and the end face 901 b is printed in the longitudinal direction of the ink particle passage hole 202. It is matched with the lower surface 201 d of the head cover 201.
  • both the flow path reduction start position 901c and the flow path reduction end position 901d are provided between the print head cover end 201a on the upstream side in the print object moving direction 204 and the longitudinal wall 202c of the ink particle passage hole. There is.
  • a slider-type fixing member 902a provided on the print head cover 201 and upstream of the print object moving direction 204 and a slider provided on the downstream side of the print object moving direction 204 as viewed from the ink particle passage hole 202 It is an example which installed the type
  • FIG. 10 shows the flow path reduction portion 901 when the surface 1001 in contact with the print head cover 201 is viewed from the front surface.
  • the flow path reduction unit 901 has a claw structure 1002 for fitting into the slider-type fasteners 902 a and 902 b on the print head cover 201.
  • FIG. 11 is an explanatory view of slider-type fasteners 902 a and 902 b provided on the print head cover 201.
  • the slider-type fixture 902a has a gap 1101 for fitting the claw structure 1002 of the flow path reduction portion 901 described in FIG.
  • the flow path reduction unit 901 having these structures and the print head cover 201 can form a removable flow path reduction depending on the case.
  • the removed flow path contraction portion 901 can be attached to the slider type fixing tool 902b in the reverse direction. Therefore, the same effect can be obtained even when the print object moving direction 204 moves.
  • a magnet is provided on the print head cover 201, and the flow path reduction unit 901 is made of iron or the like to fix the print head cover 201 and the flow path reduction unit 901.
  • a magnet may be provided in the flow path reduction portion 901, and the print head cover 201 may be made of iron.
  • FIG. 12 shows an embodiment in which the flow path reduction portion 1201 is integrated with the print head cover 201.
  • the shape of the print head cover 201 so as to constitute the flow path contraction portion 1201a on the upstream side and the flow path contraction portion 1201b on the downstream side as viewed from the ink particle passage hole 202 in the print object moving direction 204.
  • the effect of the present embodiment can be obtained even when the print object moving direction 204 is reversed.
  • any one of the upstream flow path contraction portion 1201a and the downstream flow path contraction portion 1201b may be integrated with the print head cover 201.
  • reduction part 1201 may be a curved surface.
  • the structure of the present embodiment by generating an air flow which flows out from the inside of the print head to the outside, the ink mist generated by the collision of the ink particles against the object to be printed is suppressed from flowing into the inside of the print head.
  • the internal structure resistant to contamination, it is possible to provide a continuous jet type ink jet recording apparatus capable of reducing the number of times of maintenance such as cleaning.

Landscapes

  • Ink Jet (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Abstract

L'invention concerne un dispositif d'impression à jet d'encre, lequel dispositif comporte : une buse pour la séparation en particules d'encre ; une électrode de charge pour charger les particules d'encre ; une électrode de déviation pour dévier les particules d'encre chargées ; et un capot de tête d'impression qui a un trou de passage de particules d'encre à travers lequel les particules d'encre déviées sont éjectées sur un objet à imprimer. Le dispositif d'impression à jet d'encre comporte une partie de réduction de trajectoire d'écoulement qui réduit une trajectoire d'écoulement formée entre une partie de pointe du capot de tête d'impression et l'objet à imprimer, la partie de réduction de trajectoire d'écoulement ayant une forme de saillie dans laquelle la surface de section transversale la plus proche du trou de passage de particules d'encre est supérieure à la surface de section transversale éloignée du trou de passage de particules d'encre.
PCT/JP2018/023995 2017-09-28 2018-06-25 Dispositif d'impression à jet d'encre WO2019064756A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-187609 2017-09-28
JP2017187609A JP6892117B2 (ja) 2017-09-28 2017-09-28 インクジェット記録装置

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WO2019064756A1 true WO2019064756A1 (fr) 2019-04-04

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11186086B2 (en) 2019-04-19 2021-11-30 Markem-Imaje Corporation Systems and techniques to reduce debris buildup around print head nozzles
US11872815B2 (en) 2019-04-19 2024-01-16 Markem-Imaje Corporation Purged ink removal from print head

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7328862B2 (ja) 2019-10-10 2023-08-17 株式会社日立製作所 インクジェット記録装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030197752A1 (en) * 2000-05-15 2003-10-23 Mceltresh David Inkjet printing with air movement system

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
JPH02286342A (ja) * 1989-04-28 1990-11-26 Matsushita Electric Ind Co Ltd インク記録装置
JP6213001B2 (ja) * 2013-07-18 2017-10-18 コニカミノルタ株式会社 インクジェット記録装置
JP6459414B2 (ja) * 2014-11-12 2019-01-30 セイコーエプソン株式会社 液体噴射ヘッドおよび液体噴射装置
JP2016175367A (ja) * 2015-03-23 2016-10-06 セイコーエプソン株式会社 液体噴射ヘッドおよび液体噴射装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030197752A1 (en) * 2000-05-15 2003-10-23 Mceltresh David Inkjet printing with air movement system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11186086B2 (en) 2019-04-19 2021-11-30 Markem-Imaje Corporation Systems and techniques to reduce debris buildup around print head nozzles
US11872815B2 (en) 2019-04-19 2024-01-16 Markem-Imaje Corporation Purged ink removal from print head

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JP6892117B2 (ja) 2021-06-18
JP2019059199A (ja) 2019-04-18

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