CN101541541B - Liquid ejection device, and image forming apparatus - Google Patents

Liquid ejection device, and image forming apparatus Download PDF

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Publication number
CN101541541B
CN101541541B CN2008800001543A CN200880000154A CN101541541B CN 101541541 B CN101541541 B CN 101541541B CN 2008800001543 A CN2008800001543 A CN 2008800001543A CN 200880000154 A CN200880000154 A CN 200880000154A CN 101541541 B CN101541541 B CN 101541541B
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China
Prior art keywords
liquid
fluid
jetting head
passage
feeding member
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CN2008800001543A
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Chinese (zh)
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CN101541541A (en
Inventor
加藤知己
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Ricoh Co Ltd
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Ricoh Co Ltd
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Priority claimed from JP2007034252A external-priority patent/JP4755120B2/en
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority claimed from PCT/JP2008/052205 external-priority patent/WO2008099790A1/en
Publication of CN101541541A publication Critical patent/CN101541541A/en
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Publication of CN101541541B publication Critical patent/CN101541541B/en
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    • 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
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/12—Embodiments of or processes related to ink-jet heads with ink circulating through the whole print head

Abstract

A liquid ejection device ejects liquid droplets from a liquid ejection head. The liquid ejection device includes a liquid feeding member that feeds liquid to the liquid ejection head. The liquid feeding member is connected to a liquid ejection head to feed liquid to a common liquid chamber of the liquid ejection head, which liquid ejection head includes the common liquid chamber that supplies the liquid to plural individual liquid chambers communicating with plural nozzles that eject liquid droplets. The liquid feeding member includes a liquid circulation path through which the liquid circulates in a direction parallel to a direction in which the nozzles of the liquid ejection head are aligned.

Description

Liquid injection apparatus and image forming apparatus
Technical field
The present invention relates to be used for the liquid feeding member of fluid jetting head, liquid injection apparatus, and image forming apparatus.
Background technology
Known image forming device (printer for example, facsimile machine, duplicator and the Multi Role Aircraft with function of these machines) forms by for example utilizing liquid injection apparatus to implement image to the liquid of medium injection such as ink when transmitting sheet material.Liquid injection apparatus is made of the record shower nozzle that comprises the fluid jetting head (droplet discharging head) that is used for liquid droplets (recording liquid).Notice that term used herein " medium " is also referred to as " sheet material " hereinafter, its material is not limited to paper.Term " medium that is recorded ", " recording medium ", " transfer materials " and " recording sheet " can be used as synonym and use.The synonym that term " record ", " printing " and " formation image " can be used as term " image formation " uses.
Term used herein " image forming apparatus " expression is by to such as paper, tape, and fiber, cloth, leather, metal, plastics, glass, the medium injection liquid of timber and pottery forms the equipment of image.Term used herein " image formation " not only is illustrated in the image with meaning that forms on the medium such as character and figure, also is illustrated in the image that does not have meaning that forms on the medium such as formula.Term used herein " liquid " is not limited to recording liquid and ink, also comprises being used for any liquid that image forms.Term used herein " liquid injection apparatus " expression is not limited to be used to form the liquid injection apparatus of image from the device of fluid jetting head atomizing of liquids.
The fluid jetting head that several types is arranged is such as piezoelectric type and thermal type.The piezoelectric type shower nozzle is equipped with vibrating membrane on the wall of the fluid chamber of storage ink.Vibrating membrane utilizes piezoelectric actuator or similar device to be subjected to displacement.Then, thus the Volume Changes of fluid chamber inside is to increase the pressure liquid droplets.The thermal type shower nozzle is equipped with and responds the heater element that the electric current that applies to fluid chamber produces heat.Because thereby the bubble that the heat of heater element produces increases fluid chamber pressure inside liquid droplets.
In order to improve service speed, utilize nozzle and the shower nozzle of image forming apparatus outfit through accelerating of such liquid injection system.Recently, line formula image forming apparatus comes into operation, and this image forming apparatus can utilize the long shower nozzle that comprises a plurality of short shower nozzles that link together to form image, allows to form image under the situation that need not shower nozzle scanning.
Yet if the length of shower nozzle increases to have more nozzle, the risk of ejection failure increases.A reason of ejection failure is that bubble enters fluid chamber.Bubble in the fluid chamber may stop ink feed and cause not having ink to spray, and perhaps may reduce the pressure of liquid droplets and causes spraying not enough.Even near the very little drop that for example also causes of the bubble the nozzle sprays along the direction of mistake, thereby can not form the image of anticipation.
Bubble enters shower nozzle in many ways.Bubble can or can be introduced from nozzle by the ink feed path flow.Under the situation of the shower nozzle of liquid droplets, the micro-bubble that produces in course of injection may rest in the fluid chamber utilizing heater element boiling ink diaphragm.
Enter at bubble under the situation of fluid chamber, bubble is not the spraying (so-called " the empty injection " or " pilot injection ") that is used to form image or forms negative pressure and attract operation and discharge with ink by covering nozzle face by carrying out.Perhaps, bubble can be discharged by the pressure that utilizes increase ink feed paths such as pump.When utilizing these methods to discharge bubble, though the method that is discharged from ink circulation that makes is arranged, a large amount of inks has been used and has wasted rather than be used to form image usually.Notice that the open communique (patent documentation 1) of 2005-212350 Japan Patent discloses a kind of round-robin method.
Though the bubble in the fluid chamber can only be removed by said method, the bubble in the ink feed path can be removed by making the ink circulation in the ink feed path.Even under the situation of using long shower nozzle, this method can prevent that also bubble from entering fluid chamber and need not discharge ink from the ink feed path.Yet if the bubble in the ink feed path is discharged from by making ink circulation, the meniscus in the nozzle of shower nozzle makes ink generation seepage or bubble be introduced from nozzle owing to the pressure of ink circulation destroys.
No. 2821920 Japanese patent registration (patent documentation 2) discloses a kind of ink vapo(u)r recorder that nozzle face is sealed be arranged in the ink circulation process.This ink vapo(u)r recorder comprises from the ink feed path of ink tank to the public fluid chamber direct ink of record shower nozzle, from the ink discharge path of public fluid chamber to the ink tank direct ink, the outlet containment member of the outlet that is communicated with public fluid chamber of sealing and from the ink pump of ink tank to public fluid chamber pump pumping ink water.Utilization is by the outlet of outlet containment member sealing, make ink by ink pump from ink tank via the ink feed path, public fluid chamber and ink discharge path also return ink tank and circulate.Therefore, the gas in the ink channel enters ink tank with ink.
08-238772 Japanese Patent Application Publication communique (patent documentation 3) discloses a kind of shower nozzle that prevents ink circulation pressure influence meniscus.The ink feed path is divided near the part of the independent fluid chamber of shower nozzle with away from the part of the independent fluid chamber of shower nozzle by the partition wall with a plurality of communication passage.Part away from the independent fluid chamber of shower nozzle is equipped with ink inlet pipe and ink outlet.More particularly, the circulating path that wherein has an ink feed unit is arranged between moving shower nozzle of heat and the ink tank.Public fluid chamber is communicated with a plurality of liquid paths, and these a plurality of liquid paths are communicated with a plurality of ink discharge outlets that are used to spray ink.Public fluid chamber comprises the first public fluid chamber and the second public fluid chamber.The first public fluid chamber directly is communicated with liquid path, and the second public fluid chamber is positioned at a side relative with fluid chamber one side of the first public fluid chamber and is communicated with the first public fluid chamber by a plurality of communication passage.The second public fluid chamber forms the part of circulating path, and is equipped with and is used for import that ink flows from ink tank and the outlet of flowing to ink tank.
As mentioned above, if the bubble in the ink feed path is discharged by ink circulation, then the meniscus in the nozzle of shower nozzle causes ink generation seepage or bubble to be introduced from nozzle owing to the pressure of ink circulation destroys.In order to solve such problem, can utilize disclosed technology in patent documentation 2 and 3.
Yet, when nozzle face is sealed, under the situation of the ink vapo(u)r recorder of the patent documentation 2 of circulating fluid, be difficult to complete sealed-in nozzles face if shower nozzle is grown.In addition, image can not form by atomizing of liquids in circulating fluid.
Under the situation of the shower nozzle of patent documentation 3, the partition wall that has a plurality of communication passage by utilization is divided into the ink feed path near the part of the independent fluid chamber of shower nozzle with away from fluid chamber separately and be equipped with liquid inlet tube and liquid outlet tube prevents the pressure influence meniscus of ink circulation to prevent part that bubble in the ink feed path enters independent fluid chamber.Yet, if separately the bubble that produces in the fluid chamber and the bubble introduced from nozzle since buoyancy upstream carry because the existence of partition wall makes bubble rest near the part of fluid chamber separately and can not discharge by circular flow.
Summary of the invention
Consider content mentioned above, the present invention aims to provide a kind of liquid feeding member that is used for fluid jetting head, this liquid feeding member utilizes circular flow to discharge to comprise in the liquid feed path bubble introduced from shower nozzle and can not prevent the harmful effect such as the meniscus destruction that produces owing to circulating pressure to the outside liquid of overflowing.The present invention also aims to provide a kind of liquid injection apparatus and comprises the image forming apparatus of this liquid feeding member.
A kind of liquid injection apparatus from the fluid jetting head liquid droplets is provided in an embodiment of the present invention.This liquid injection apparatus comprises the liquid feeding member to the fluid jetting head feed liquid, this liquid feeding member is connected with fluid jetting head with the public fluid chamber feed liquid to fluid jetting head, and this fluid jetting head comprises the public fluid chamber that liquid is provided to a plurality of independent fluid chamber that are communicated with the nozzle of a plurality of liquid droplets.This liquid feeding member comprise liquid along and the liquid circulating passage footpath passed through of the parallel direction circulation time of the direction that is in line of the nozzle of fluid jetting head.The outlet that feed port that liquid passes through when liquid circulating passage directly provides and liquid pass through when liquid circulating passage is directly discharged is arranged on the longitudinal relative end in liquid circulating passage footpath.The open communication that is communicated with public fluid chamber is arranged on public fluid chamber one side in the liquid circulating passage footpath.This open communication has than the little width in liquid circulating passage footpath.
A kind of liquid injection apparatus from the fluid jetting head liquid droplets is provided in one embodiment of the invention.This liquid injection apparatus comprises the liquid feeding member to the fluid jetting head feed liquid, this liquid feeding member is connected with fluid jetting head with the public fluid chamber feed liquid to fluid jetting head, and this fluid jetting head comprises the public fluid chamber that liquid is provided to a plurality of independent fluid chamber that are communicated with the nozzle of a plurality of liquid droplets.This liquid feeding member comprise liquid along and the liquid circulating passage footpath passed through of the parallel direction circulation time of the direction that is in line of the nozzle of fluid jetting head.The outlet that feed port that liquid passes through when liquid circulating passage directly provides and liquid pass through when liquid circulating passage is directly discharged is arranged on the longitudinal relative end in liquid circulating passage footpath.The open communication that is communicated with public fluid chamber is arranged on public fluid chamber one side in the liquid circulating passage footpath.A plurality of fins be arranged on open communication around.
A kind of liquid injection apparatus from a plurality of fluid jetting head liquid droplets is provided in an embodiment of the present invention, and this liquid injection apparatus comprises along the longitudinal direction elongation of liquid jet structure spare and along a plurality of fluid jetting heads that vertically depart from arrangement perpendicular to the direction of longitudinal direction mutually; Be connected with a plurality of fluid jetting heads with liquid feeding member to the public fluid chamber feed liquid of fluid jetting head, each fluid jetting head comprises the public fluid chamber that liquid is provided to a plurality of independent fluid chamber that is communicated with the nozzle of a plurality of liquid droplets.The liquid feeding member comprise liquid along and the fluid passage that passes through of the parallel direction of the direction that is in line of the nozzle of each fluid jetting head.The outlet that feed port that liquid passes through when fluid passage provides and liquid pass through when fluid passage is discharged is arranged on the fluid passage.Fluid passage has than the bigger sectional area of part between the adjacent public fluid chamber in the part that is connected to fluid jetting head.
Provide a kind of in an embodiment of the present invention and be connected with fluid jetting head with the liquid feeding member to the public fluid chamber feed liquid of fluid jetting head, this fluid jetting head comprises the public fluid chamber that liquid is provided to a plurality of independent fluid chamber that are communicated with the nozzle of a plurality of liquid droplets.This liquid feeding member comprise liquid along and the liquid circulating passage footpath passed through of the parallel direction circulation time of the direction that is in line of the nozzle of fluid jetting head, wherein the outlet that passes through when liquid circulating passage is directly discharged of the feed port passed through when liquid circulating passage directly provides of liquid and liquid is arranged on the longitudinal relative end in liquid circulating passage footpath; And wherein a plurality of fins are formed on the inwall of public fluid chamber one side in the liquid feeding member.
Provide a kind of in an embodiment of the present invention and be connected with fluid jetting head with the liquid feeding member to the public fluid chamber feed liquid of fluid jetting head, this fluid jetting head comprises the public fluid chamber that liquid is provided to a plurality of independent fluid chamber that are communicated with the nozzle of a plurality of liquid droplets.This liquid feeding member comprise liquid along and the liquid circulating passage footpath passed through of the parallel direction circulation time of the direction that is in line of the nozzle of fluid jetting head, wherein the outlet that passes through when liquid circulating passage is directly discharged of the feed port passed through when liquid circulating passage directly provides of liquid and liquid is arranged on the longitudinal relative end in liquid circulating passage footpath; Wherein narrower and at the end broad from feed port liquid circulating passage footpath on the cross section of flowing of outlet at the cardinal principle pars intermedia perpendicular to liquid; And the open communication of one of them end and public fluid chamber and feed port and outlet are arranged on another end.
Provide a kind of in an embodiment of the present invention and be connected with fluid jetting head with the liquid feeding member to the public fluid chamber feed liquid of fluid jetting head, this fluid jetting head comprises the public fluid chamber that liquid is provided to a plurality of independent fluid chamber that are communicated with the nozzle of a plurality of liquid droplets.This liquid feeding member comprise liquid along and the liquid circulating passage footpath passed through of the parallel direction circulation time of the direction that is in line of the nozzle of fluid jetting head, the outlet that feed port that liquid passes through when liquid circulating passage directly provides and liquid pass through when liquid circulating passage is directly discharged wherein is set; Wherein an openning in feed port and the outlet is arranged on the part place of vertical end of on-liquid circulating path; And wherein the guide of flow member that flows of guiding liquids is arranged between the feed port and the described openning in the outlet at part place of public fluid chamber and non-vertical end.
Other purpose of the present invention, feature and advantage will become clearer by in conjunction with the accompanying drawings detailed description hereinafter.
Description of drawings
Fig. 1 is the perspective view that shows the integrated ejection head unit that comprises fluid jetting head and liquid feeding member of the first embodiment of the present invention;
Fig. 2 is the longitudinal sectional view that shows ejection head unit;
Fig. 3 is the sectional view along the ejection head unit of the line A-A of Fig. 2;
Fig. 4 is the longitudinal sectional drawing of the ejection head unit of explanation second embodiment;
Fig. 5 is the sectional view along the ejection head unit of the line B-B of Fig. 4;
Fig. 6 is the longitudinal sectional drawing that shows the ejection head unit of comparative example 1;
Fig. 7 is the sectional view along the line C-C of Fig. 6;
Fig. 8 is the longitudinal sectional drawing that shows the ejection head unit of comparative example 2;
Fig. 9 is the sectional view along the line D-D of Fig. 8;
Figure 10 A to 10C is the schematic diagram of the liquid circulating passage different cross section shape directly of explanation second embodiment;
Figure 11 is the longitudinal sectional drawing of ejection head unit of the liquid feeding member of the explanation second embodiment of the present invention;
Figure 12 is the sectional view along the ejection head unit of the line E-E of Figure 11;
Figure 13 is the sectional view along the ejection head unit of the line F-F of Figure 11;
Figure 14 is the longitudinal sectional drawing of ejection head unit of the liquid feeding member of the explanation third embodiment of the present invention;
Figure 15 is the sectional view along the ejection head unit of the line G-G of Figure 14;
Figure 16 is the sectional view along the ejection head unit of the line H-H of Figure 14;
Figure 17 is the schematic diagram of ejection head unit of the liquid feeding member of the explanation fourth embodiment of the present invention;
Figure 18 is the sectional view along the ejection head unit of the line I-I of Figure 17;
Figure 19 is the sectional view along the line J-J of Figure 17;
Figure 20 is the profile view of ejection head unit of the liquid feeding member of the explanation fifth embodiment of the present invention;
Figure 21 is the sectional view along the example of the ejection head unit of the line K-K of Figure 20;
Figure 22 is the sectional view along another example of the ejection head unit of the line K-K of Figure 20;
Figure 23 is the transverse cross-sectional view of ejection head unit of the liquid feeding member of the explanation sixth embodiment of the present invention;
Figure 24 is the longitudinal sectional drawing of ejection head unit of the liquid feeding member of the explanation seventh embodiment of the present invention;
Figure 25 is the sectional view along the ejection head unit of the line L-L of Figure 24;
Figure 26 is the longitudinal sectional drawing that shows the ejection head unit of comparative example 3;
Figure 27 is the sectional view along the ejection head unit of the line M-M of Figure 26;
Figure 28 is the longitudinal sectional drawing of ejection head unit of the liquid feeding member of the explanation eighth embodiment of the present invention;
Figure 29 illustrates the longitudinal sectional drawing of the ejection head unit of the 8th embodiment;
Figure 30 is the transverse cross-sectional view that shows the ejection head unit of comparative example 5;
Figure 31 is the longitudinal sectional drawing of ejection head unit of the liquid feeding member of the explanation ninth embodiment of the present invention;
Figure 32 is the sectional view along the ejection head unit of the line N-N of Figure 31;
Figure 33 is the longitudinal sectional drawing of ejection head unit of the liquid feeding member of the explanation tenth embodiment of the present invention;
Figure 34 is the sectional view along the ejection head unit of the line O-O of Figure 33;
Figure 35 is the transverse cross-sectional view of ejection head unit of the liquid feeding member of the explanation 11st embodiment of the present invention;
Figure 36 is the transverse cross-sectional view of ejection head unit of the liquid feeding member of the explanation 12nd embodiment of the present invention;
Figure 37 is the sectional view along the line P-P of Figure 36;
Figure 38 is the schematic diagram of the image forming apparatus of the explanation 13rd embodiment of the present invention;
Figure 39 is the schematic diagram of the maintenance/recovery operation of explanation image forming apparatus;
Figure 40 is the schematic diagram of the liquid feed path of this image forming apparatus of explanation;
Figure 41 is the schematic diagram of the maintenance/recovery operation of explanation image forming apparatus;
Figure 42 is the schematic diagram of the maintenance/recovery operation of explanation image forming apparatus;
Figure 43 is the schematic diagram of liquid feed path of the image forming apparatus of the explanation 15th embodiment of the present invention;
Figure 44 is the perspective view that schematically shows the ejection head unit of the 16th embodiment of the present invention that comprises the liquid feeding member that is used for fluid jetting head;
Figure 45 is the longitudinal sectional drawing that shows ejection head unit;
Figure 46 is the sectional view that schematically shows ejection head unit along the line B-B of Figure 47;
Figure 47 is the amplification sectional view along the ejection head unit of the line A-A of Figure 45;
Figure 48 is the amplification transverse cross-sectional view that schematically shows fluid jetting head;
Figure 49 is the longitudinal sectional drawing that shows the ejection head unit of the 17th embodiment of the present invention;
Figure 50 is the longitudinal sectional drawing that shows the ejection head unit of comparative example 6;
Figure 51 is the longitudinal sectional drawing that shows the ejection head unit of the 18th embodiment of the present invention;
Figure 52 is the longitudinal sectional drawing that schematically shows the ejection head unit of the 19th embodiment of the present invention;
Figure 53 is the sectional view along the line D-D of Figure 54 that schematically shows ejection head unit;
Figure 54 is the amplification sectional view along the ejection head unit of the line C-C of Figure 52;
Figure 55 is the longitudinal sectional drawing that schematically shows the ejection head unit of the 20th embodiment of the present invention;
Figure 56 is the sectional view along the line F-F of Figure 57;
Figure 57 is the amplification sectional view along the ejection head unit of the line E-E of Figure 55;
Figure 58 is the longitudinal sectional drawing that schematically shows the ejection head unit of comparative example 7;
Figure 59 is the sectional view that schematically shows ejection head unit along the line H-H of Figure 60;
Figure 60 is the sectional view along the ejection head unit of the line G-G of Figure 58;
Figure 61 is the vertical schematic diagram that shows the ejection head unit of the 21st embodiment of the present invention;
Figure 62 is the plane that schematically shows ejection head unit;
Figure 63 is the schematic diagram of the image forming apparatus of the explanation 22nd embodiment of the present invention;
Figure 64 is the schematic diagram of the maintenance/recovery operation of explanation image forming apparatus;
Figure 65 is the schematic diagram of the liquid feed path of explanation image forming apparatus;
Figure 66 is the schematic diagram of the maintenance/recovery operation of explanation image forming apparatus;
Figure 67 is the schematic diagram of the maintenance/recovery operation of explanation image forming apparatus; And
Figure 68 is the schematic diagram of liquid feed path of the image forming apparatus of the explanation 23rd embodiment of the present invention.
The specific embodiment
Hereinafter with preferred embodiments of the invention will now be described with reference to the accompanying drawings.The liquid feeding member 10 that is used for the embodiments of the invention of fluid jetting head 1 is described below with reference to Fig. 1 to 3.Fig. 1 is the perspective view that shows the integrated ejection head unit of the fluid jetting head 1 comprise embodiments of the invention and liquid feeding member 10.Fig. 2 is the longitudinal sectional view that shows ejection head unit.Fig. 3 is the sectional view along the ejection head unit of the line A-A of Fig. 2.
Fluid jetting head 1 is for the thermal type shower nozzle and comprise heater element substrate 2 and flow channel substrate 3.The independent fluid chamber 6 that flow channel substrate 3 is equipped with a plurality of nozzles 5 that are used for liquid droplets and is communicated with corresponding nozzle 5.Heater element substrate 2 is equipped with the heater element 4 corresponding with independent fluid chamber 6.Power supply unit (not shown) such as FPC is connected with heater element substrate 2.When pulse voltage when power supply unit is applied to heater element 4, heater element 4 is actuated to cause the film boiling (film boiling) of the liquid in the independent fluid chamber 6, thus from nozzle 5 liquid droplets.As shown in Figure 1, form two row's nozzles in this embodiment, every row's nozzle comprises a plurality of nozzles 5 that are in line along the longitudinal direction of fluid jetting head.With reference to Fig. 3, the liquid that the independent fluid chamber 6 corresponding with nozzle 5 receives from the public fluid chamber 7 that is arranged on heater element substrate 2 centers.
Shown in Fig. 2 and 3, the opening of the public fluid chamber 7 in the heater element substrate 2 of the liquid circulating passage of the liquid feeding member 10 of this embodiment footpath 11 and fluid jetting head 1 is connected.
Liquid feeding member 10 comprises the liquid circulating passage footpath 11 that the liquid circulation time passes through.In liquid circulating passage footpath 11, the zone that is connected to fluid jetting head 1 is limited by the narrow communication passage 11b with relative small bore aperture area (small bore is long-pending), narrow communication passage 11b is defined for from liquid feeding member 10 to fluid jetting head the open communication of the fluid connection of 1 public fluid chamber 7, is limited by the main channel 11a with larger cross-section aperture area with fluid jetting head 1 separated zone.The outlet 13 that passes through when the feed port passed through when liquid is provided 12 is discharged from liquid is formed on the longitudinal relative end (on the parallel direction of the direction that is in line with the nozzle 5 of fluid jetting head 1) of liquid feeding member 10.Feed port 12 and outlet 13 all are communicated with main channel 11a.Term used herein " cross section aperture area " expression shown in the cross sectional side view of Fig. 3 at aperture area perpendicular to the cross section on the direction (horizontal direction of liquid feeding member 10) of the longitudinal direction of liquid feeding member 10 (direction that the nozzle of fluid jetting head 1 is in line produces the direction of circular flow).
As mentioned below, liquid feeding member 10 is arranged on and makes the liquid circulation to flow through the liquid feed path (not shown) in liquid circulating passage footpath 11 to outlet 13 from feed port 12.In Fig. 2 and some other figure, point to the arrow of feed port 12 and the arrows that outwards point to from outlet 13 direction introduced of express liquids and the liquid direction of discharging respectively.
The function of liquid feeding member 10 will compare with the comparative example 2 shown in the comparative example 1 shown in the Figure 4 and 5 and Fig. 8 and 9 hereinafter and be illustrated.
The liquid that provides from feed port 12 is provided fluid jetting head 1.In some cases, bubble 50 enters also from the liquid feed path (not shown) that is connected to feed port 12 and directly is detained and accumulates in 11 top (top board 11d) as liquid circulating passage that Figure 4 and 5 are shown in.As long as the quantity of bubble 50 is few, problem can not produce.Yet if the quantity of bubble 50 increases, bubble 50 enters independent fluid chamber 6 with liquid, causes such as spraying malfunctioning fault.
In order to prevent such problem, liquid feeding member 10 is configured to make liquid to flow to circulate the liquid feed path that does not show to outlet 13 from feed port 12.Therefore, bubble 50 is carried and is discharged from liquid circulating passage footpath 11 by outlet 13 by the circular flow of liquid.In the liquid circulating passage footpath 11 of liquid feeding member 10, have perpendicular to the long-pending main channel 11a in the relative heavy in section of the direction that produces circular flow and be connected with outlet 13 to allow the liquid circulation with feed port 12, simultaneously, have perpendicular to the long-pending narrow communication passage 11b of the relative small bore of the direction that produces circular flow and be arranged between main channel 11a and the fluid jetting head 1.This structure prevents that circular flow from producing fault in fluid jetting head 1.
For example, under the situation of the comparative example shown in Fig. 6 and 71, the liquid circulating passage footpath 11 with the long-pending liquid feeding member 10 of uniform cross-section is arranged near the fluid jetting head 1.When circular flow produced between feed port 12 and outlet 13, bubble 50 was carried by the high-velocity fluid shown in the arrow 60 and discharges from outlet 13 effectively.Yet because the high speed circular flow that is produced is in close proximity to the public fluid chamber 7 of fluid jetting head 1, so the meniscus in the nozzle 5 of fluid jetting head 1 is destroyed, produces the fault of introducing from nozzle 5 from nozzle 5 overflows or opposite bubble such as liquid.
Under the situation of the comparative example shown in Fig. 8 and 92, circular flow with fluid jetting head 1 separated region generating.That is, in this comparative example 2, feed port 12 and outlet 13 are formed on the upside in liquid circulating passage footpath 11.Therefore, the upside of the relative high-velocity fluid shown in the arrow 61 in liquid circulating passage footpath 11 produces, and simultaneously, the downside of the relative low velocity fluid shown in the arrow 62 in liquid circulating passage footpath 11 produces.If the height h from fluid jetting head 1 to the line that connects feed port 12 and outlet 13 increases and circular flow and fluid jetting head 1 are separated, and is then different with comparative example 1, can prevent that meniscus is destroyed.
Yet, utilize the structure of comparative example 2, the speed of circular flow is owing to liquid circulating passage footpath 11 reduces through increased cross-section is long-pending, and the performance that causes discharging bubble descends.Increase the meniscus in the flow velocity negative effect fluid jetting head 1 of circular flow in order to improve the bubble discharging performance, therefore be difficult to produce superior condition.
Under the situation of the liquid feeding member 10 of this embodiment, shown in Figure 4 and 5, liquid circulating passage footpath 11 is included in a side that is connected to fluid jetting head 1 to have the long-pending narrow communication passage 11b of small bore and has the long-pending main channel 11a in heavy in section with fluid jetting head 1 a separated side.Because the liquid among the narrow communication passage 11b flows (flow rate and speed are represented by arrow SB) with low speed because the wall of passage is close to each other, circular flow produces (flow rate and speed are represented by arrow MB) in the 11a of main channel basically.Therefore, can under the situation of the meniscus in not destroying nozzle 5, produce high speed circular flow and 11 discharge bubble 50 effectively from liquid circulating passage footpath.
In addition, in the liquid feeding member 10 of this embodiment, shown in Fig. 2 and 3, the narrow communication passage 11b that limits the open communication of liquid feeding member 10 opens to the whole opening of the public fluid chamber 7 of fluid jetting head 1.Be arranged on without any the element that hinders liquid flow between the top board 11d in public fluid chamber 7 and liquid circulating passage footpath 11 such as partition wall.Therefore, in the independent fluid chamber 6 of fluid jetting head 1, produced or from nozzle 5 introduce and move to the public fluid chamber 7 bubble since buoyancy can rise to the top board 11d in liquid circulating passage footpath 11 and can discharge by circular flow.
Shape perpendicular to the cross section of the liquid flow in the liquid circulating passage of liquid feeding member 10 footpath 11 is not limited to parallel plane shape shown in Figure 3.For example, shown in Figure 10 A, this cross section can have the non-parallel planes shape that narrow communication passage 11b is offset with respect to main channel 11a in a lateral direction.Shown in Figure 10 B, this cross section can have that main channel 11a is connected with narrow communication passage 11b and the shape that forms inclined plane 11g.Shown in Figure 10 C, even this cross section can have the shape that directly still can not rise along the inclined plane 11b1 of narrow communication passage 11b towards the top board bubble of main channel 11a with the junction surface of fluid jetting head 1.Though do not show, each limit and bight can be crooked.Though feed port 12 has identical internal diameter with outlet 13 in this embodiment, also can have different internal diameters.
As mentioned above, liquid feeding member 10 comprise liquid along and the liquid circulating passage footpath 11 passed through of the parallel direction circulation time of the direction that is in line of the nozzle 5 of fluid jetting head 1.The outlet 13 that feed port 12 that liquid passes through when liquid circulating passage footpath 11 provides and liquid pass through when discharge in liquid circulating passage footpath 11 is arranged on the longitudinal relative end in liquid circulating passage footpath 11.The open communication that is communicated with public fluid chamber 7 is formed on public fluid chamber 7 one sides in the liquid circulating passage footpath 11.This open communication has the width littler than liquid circulating passage footpath 11.Utilize this structure, can discharge the bubble that in fluid jetting head 1, produces or introduce fluid jetting head 1 from the upstream of liquid feed path, prevent that simultaneously the meniscus in the fluid jetting head 1 is destroyed by circular flow.
The liquid feeding member 10 of the second embodiment of the present invention hereinafter is described with reference to Figure 11 to 13.Figure 11 is the longitudinal sectional drawing that shows according to the ejection head unit of this embodiment.Figure 12 is the sectional view along the ejection head unit of the line E-E of Figure 11.Figure 13 is the sectional view along the ejection head unit of the line F-F of Figure 11.
In the liquid feeding member 10 of this ejection head unit, narrow communication passage 11b has the different degree of depth at end and pars intermedia that feed port 12 and outlet 13 are set.
More particularly, be defined as the end from distance (length) Ls of feed port 12 beginnings interior zone (presenting the territory, lateral areas) and the zone (ejection side zone) in distance (length) Ls of outlet 13 beginnings.Present territory, lateral areas and ejection side zone zone in addition and be defined as pars intermedia.The depth H b of narrow communication passage 11b big in the end (for example in the position shown in the cross section of Figure 13, depth H b=Hb2) and at pars intermedia less (in Figure 12, depth H b=Hb1).Difference between the highest part of pars intermedia and the lowermost portion of end is Yb.Inclined plane 11h is formed the depth H b that makes narrow communication passage 11b to be increased to feed port 12 and outlet 13 gradually from pars intermedia.
This structure prevents that more reliably the meniscus of end of fluid jetting head 1 is destroyed.Because feed port 12 and outlet 13 have the cross section aperture area littler than liquid circulating passage footpath 11, thus liquid at feed port 12 and outlet 13 than in liquid circulating passage footpath 11, flowing soon.Therefore, liquid circulation to the harmful effect of meniscus near the end of feed port 12 and outlet 13 greater than with feed port 12 and outlet 13 separated pars intermedias.Because narrow communication passage 11b has the degree of depth bigger than pars intermedia in the end that feed port 12 and outlet 13 are set, therefore can prevent more reliably that the meniscus of fluid jetting head 1 end is destroyed.
In addition, because shape of cross section gradually changes near the junction surface between the junction surface between feed port 12 and the main channel 11a and outlet 13 and the main channel 11a, promptly, because the degree of depth of narrow communication passage 11b increases to feed port 12 and outlet 13 gradually from pars intermedia as mentioned above, so flowing of liquid stablized in the 11a of main channel.
As mentioned above, liquid feeding member 10 comprise liquid along and the liquid circulating passage footpath 11 passed through of the parallel direction circulation time of the direction that is in line of the nozzle 5 of fluid jetting head 1.The outlet 13 that feed port 12 that liquid passes through when liquid circulating passage footpath 11 provides and liquid pass through when discharge in liquid circulating passage footpath 11 is arranged on the longitudinal relative end in liquid circulating passage footpath 11.The open communication that is communicated with public fluid chamber 7 is formed on public fluid chamber 7 one sides in the liquid circulating passage footpath 11.This open communication has than the little width in liquid circulating passage footpath 11 and in feed port one side or outlet one side and has the degree of depth bigger than remainder.Utilize this structure, can discharge the bubble that in fluid jetting head 1, produces or introduce fluid jetting head 1 from the upstream of liquid feed path, prevent that more reliably the meniscus in the fluid jetting head 1 is destroyed simultaneously by circular flow.
The liquid feeding member 10 of the third embodiment of the present invention hereinafter is described with reference to Figure 14 to 16.Figure 14 is the longitudinal sectional drawing that shows according to the ejection head unit of this embodiment.Figure 15 is the sectional view along the ejection head unit of the line G-G of Figure 14.Figure 16 is the sectional view along the ejection head unit of the line H-H of Figure 14.
In the liquid feeding member 10 of this ejection head unit, the open communication 17 that is communicated with the public fluid chamber 7 of fluid jetting head 1 is formed on public fluid chamber 7 one sides in the liquid circulating passage footpath 11.A plurality of fins of erectting to main channel 11a 16 are set around the open communication.
Being provided with of fin 16 increased the contact area between the wall of public fluid chamber 7 one sides in circulating fluid and the liquid circulating passage footpath 11.Therefore, the liquid circulation time in liquid feeding member 10, public fluid chamber 7 one sides of circular flow in liquid circulating passage footpath 11 slow down, and the result reduces the harmful effect of circular flow to meniscus.
As mentioned above, liquid feeding member 10 comprise liquid along and the liquid circulating passage footpath 11 passed through of the parallel direction circulation time of the direction that is in line of the nozzle 5 of fluid jetting head 1.The outlet 13 that feed port 12 that liquid passes through when liquid circulating passage footpath 11 provides and liquid pass through when discharge in liquid circulating passage footpath 11 is arranged on the longitudinal relative end in liquid circulating passage footpath 11.The open communication 17 that is communicated with public fluid chamber is formed on public fluid chamber 7 one sides in the liquid circulating passage footpath 11.Fin 16 is arranged on around the open communication 17.Utilize this structure, can discharge the bubble that in fluid jetting head 1, produces or introduce fluid jetting head 1 from the upstream of liquid feed path, prevent that simultaneously the meniscus in the fluid jetting head 1 is destroyed by circular flow.
The liquid feeding member 10 of the fourth embodiment of the present invention hereinafter is described with reference to Figure 17 to 19.Figure 17 is the longitudinal sectional drawing that shows according to the ejection head unit of this embodiment.Figure 18 is the sectional view along the ejection head unit of the line I-I of Figure 17.Figure 19 is the sectional view along the ejection head unit of the line J-J of Figure 17.
In the liquid feeding member 10 of this ejection head unit, a plurality of fins 16 are formed on the inwall of public fluid chamber 7 one sides of fluid jetting head 1.Each fin 16 is in the end that feed port 12 and outlet 13 are set and have different height at pars intermedia.
More specifically, be similar to second embodiment, zone (presenting the territory, lateral areas) and the zone (ejection side zone) in the distance L s of outlet 13 beginnings in the distance L s of feed port 12 beginnings are defined as the end.Present territory, lateral areas and ejection side zone zone in addition and be defined as pars intermedia.The height H b of each fin 16 is big and less at pars intermedia in the end.The difference in height of the fin 16 between end and the pars intermedia is Yb.Inclined plane 16h forms at fin 16a and 16b place, and the height of fin 16a and 16b is increased to feed port 12 and outlet 13 gradually from pars intermedia.
This structure prevents that more reliably the meniscus of fluid jetting head 1 end is destroyed.Because feed port 12 and outlet 13 have the cross section aperture area littler than liquid circulating passage footpath 11, liquid at feed port 12 and outlet 13 than in liquid circulating passage footpath 11, flowing soon.Therefore, liquid circulation to the harmful effect of meniscus near the end of feed port 12 and outlet 13 greater than with feed port 12 and outlet 13 separated pars intermedias.Because flowing of public fluid chamber 7 one sides as under the situation of the 3rd embodiment, being slowed down and, therefore can preventing more reliably that the meniscus of fluid jetting head 1 end is destroyed because fin 16 has the height bigger than pars intermedia in the end that feed port 12 and outlet 13 are set.In addition, because the height of fin 16 increases gradually in the end, therefore shape of cross section gradually changes near the junction surface between the junction surface between feed port 12 and the liquid circulating passage footpath 11 and outlet 13 and the liquid circulating passage footpath 11, produces stable liquid stream thus.
As mentioned above, liquid feeding member 10 comprise liquid along and the liquid circulating passage footpath 11 passed through of the parallel direction circulation time of the direction that is in line of the nozzle 5 of fluid jetting head 1.The outlet 13 that feed port 12 that liquid passes through when liquid circulating passage footpath 11 provides and liquid pass through when discharge in liquid circulating passage footpath 11 is arranged on the longitudinal relative end in liquid circulating passage footpath 11.Fin 16 is formed on the inwall of public fluid chamber 7 one sides in the liquid feeding member 10.Utilize this structure, can discharge the bubble that in fluid jetting head 1, produces or introduce fluid jetting head 1 from the upstream of liquid feed path, prevent that simultaneously the meniscus in the fluid jetting head 1 is destroyed by circular flow.
The liquid feeding member 10 of the fifth embodiment of the present invention hereinafter is described with reference to Figure 20 to 22.Figure 20 is the horizontal sectional drawing that shows according to the ejection head unit of this embodiment.Figure 21 is the sectional view along the example of the ejection head unit of the line K-K of Figure 20.Figure 22 is the sectional view along another example of the ejection head unit of the line K-K of Figure 20.
In third and fourth embodiment, fin 16 forms the longitudinal direction (producing the direction of circular flow) that is in substantially parallel relationship to liquid circulating passage footpath 11.On the other hand, in the liquid feeding member 10 of the ejection head unit of this embodiment, fin 16 forms along the direction perpendicular to the longitudinal direction in liquid circulating passage footpath 11.
This structure has not only increased the contact area between the wall of public fluid chamber 7 one sides in circulating fluid and the liquid circulating passage footpath 11, and because the variation along the sectional area of the direction that produces circular flow in liquid circulating passage footpath 11 further reduces the flowing of zone that fin 16 is set.Therefore work as the liquid circulation time in the liquid feeding member 10, circular flow public fluid chamber 7 one sides in liquid circulating passage footpath 11 slow down, and the result reduces the harmful effect of circular flow to meniscus.
Example as shown in figure 22, if make fin 16 have the height bigger than the fin of pars intermedia near feed port 12 and outlet 13 (in the end), then, can prevent more reliably that the meniscus of fluid jetting head 1 end is destroyed based on the reason identical with the situation of the 4th embodiment.In addition, shape of cross section gradually changes near the junction surface between the junction surface between feed port 12 and the liquid circulating passage footpath 11 and outlet 13 and the liquid circulating passage footpath 11, produces stable liquid stream thus.
The liquid feeding member 10 of the sixth embodiment of the present invention hereinafter is described with reference to Figure 23.Figure 23 is the transverse cross-sectional view that shows according to the ejection head unit of this embodiment.
In the liquid feeding member 10 of this ejection head unit, in the cross section perpendicular to the direction that produces circular flow in liquid circulating passage footpath 11, main channel 11a has summit leg-of-mutton shape vertically upward.Because main channel 11a has up the leg-of-mutton cross sectional shape that points to and narrows down towards top board 11d, so the bubble in the liquid circulating passage footpath 11 is collected in the top, is convenient to discharge bubble by circular flow.In addition, minute bubbles are combined into air pocket on top board 11d, also are convenient to discharge bubble.
The liquid feeding member 10 of the seventh embodiment of the present invention hereinafter is described with reference to Figure 24 and 25.Figure 24 is the profilograph that shows according to the ejection head unit of this embodiment.Figure 25 is the sectional view along the ejection head unit of the line L-L of Figure 24.
In the liquid feeding member 10 of this ejection head unit, feed port 12 and outlet 13 are arranged on the position of the top surface 11d (top board) in more close liquid circulating passage footpath 11 in the liquid feeding member 10 of longitudinal end than second embodiment.
More specifically, in a second embodiment, the top board 11d that feed port 12 and outlet 13 are arranged on liquid circulating passage footpath 11 separates on the position of height Yh.In this embodiment, feed port 12 and outlet 13 are arranged on the position that top board 11d with liquid circulating passage footpath 11 separates height Yh1 (Yh1＜Yh).
Because bubble 50 is because buoyancy is floating and rest on the top surface in liquid circulating passage footpath 11, if the circular flow that is produced has the speed through increasing in the position near the top board 11d of liquid circulation channel 11, then bubble 50 is easy to discharge.Therefore, feed port 12 and outlet 13 are arranged on the position near the top board 11d in liquid circulating passage footpath 11, thereby increase the flow velocity near top board 11d.
Situation as the liquid feeding member 10 of first to the 7th embodiment, because it is right that feed port 12 and outlet 13 are set to above the direction that longitudinal direction in liquid circulating passage footpath 11 just produces circular flow, therefore circular flow is tending towards only flowing along a direction, strengthens the effect of discharging bubble thus.
Even be formed on the surperficial facing surfaces that is connected to fluid jetting head 1 (top board 11d) of liquid member 10 with feed port 12 shown in 27 and outlet 13 at Figure 26 under the situation of the comparative example 3 of going up (so that linking to each other with liquid circulating passage footpath 11), circular flow is also produced.Yet circular flow flows shown in arrow 65 to 67, and the velocity component of fluid jetting head 1 direction is undesirably increased.
The liquid feeding member 10 of the eighth embodiment of the present invention hereinafter is described with reference to Figure 28.Figure 28 is the longitudinal sectional drawing that shows according to the ejection head unit of this embodiment.
The liquid feeding member 10 of this ejection head unit is with the different of liquid feeding member 10 of second embodiment, feed port 12 is arranged on the surperficial facing surfaces that is connected to fluid jetting head 1 with liquid feeding member 10 (in top board 11d one side, be also referred to as top plate portion) vertical pars intermedia, outlet 13,13 are arranged on longitudinal end (perhaps, feed port 12,12 can be arranged on the end, and outlet 13 can be arranged on the pars intermedia of top board side).
Be used for being arranged between the public fluid chamber 7 of feed port 12 and fluid jetting head 1 to the guide of flow member 18 that outlet 13,13 guiding liquids flow from feed port 12.Guide of flow member 18 form inclined plane 19 with public fluid chamber 7 facing surfaces, in order to avoid catch the bubble that rises from public fluid chamber 7.
Be arranged under the situation of the vertical pars intermedia in the top plate portion of liquid feeding member 10 in feed port 12 (or outlet 13), guide of flow member 18 the meniscus that can prevent in the circular flow negative effect fluid jetting head 1 is set.
Under the situation of as shown in figure 29 the comparative example that guide of flow member 18 is not set 4, because the short distance between feed port 12 and each outlet 13, bubble can be discharged easily.Yet, because the harmful effect to meniscus more may take place in the velocity component through increasing of the direction of fluid jetting head 1.In addition, liquid may cause borderline flow stagnation and whirlpool along two rightabouts are mobile in a pipeline.Therefore, the performance of discharge bubble is lower than the structure that liquid only flows in one direction.
Therefore, be not arranged at feed port 12 or outlet 13 under the situation on the flow direction of circular flow, guide of flow member 18 is arranged between the public fluid chamber 7 of feed port 12 or outlet 13 and fluid jetting head 1 mobile to guide.Therefore, can prevent meniscus in the circular flow negative effect fluid jetting head 1.
As mentioned above, liquid feeding member 10 comprise liquid along and the liquid circulating passage footpath 11 passed through of the parallel direction circulation time of the direction that is in line of the nozzle 5 of fluid jetting head 1.The outlet 13,13 that feed port 12 that liquid passes through when liquid circulating passage footpath 11 provides and liquid pass through when discharge in liquid circulating passage footpath 11 is set up.Feed port 12 is arranged on the part of longitudinal end of on-liquid circulating path 11.The guide of flow member 18 that guiding liquids flows is arranged between the feed port 12 and public fluid chamber 7 that is provided with on the part of non-longitudinal end.Utilize this structure, can discharge the bubble that in fluid jetting head 1, produces or introduce fluid jetting head 1 from the upstream of liquid feed path, prevent that simultaneously the meniscus in the fluid jetting head 1 is destroyed by circular flow.In addition, even guide of flow member 18 also can change the direction of the liquid flow that produces because of the liquid circulation when feed port 12 or outlet 13 are arranged on the part of longitudinal end of on-liquid feeding member 10, and therefore can prevent the harmful effect to fluid jetting head 1.Therefore, the liquid feeding member can be equipped with a large amount of openings to improve the performance of discharging bubble.
It is inadvisable in the liquid circulating passage footpath 11 of liquid feeding member 10 filter 14 to be set in the comparative example 5 as shown in figure 30.Being arranged on of filter 14 reduced flowing to the influence of fluid jetting head one side and preventing that bubble 50 in the 11a of main channel from entering fluid jetting head 1 aspect is effective of circular flow.Yet, when the bubble 51 of introducing or in fluid chamber 6 separately, producing from nozzle 5 by public fluid chamber 7 when the main channel 11a in liquid circulating passage footpath 11 moves, bubble 51 is filtered device 14 obstructions and can not discharges by circular flow.Bubble 51 can not be discharged and can only discharge from nozzle 5 together with liquid by circular flow.Therefore, it is inadvisable in fluid jetting head 1 and liquid circulating passage footpath 11 filter 14 to be set.
The liquid feeding member 10 of the ninth embodiment of the present invention hereinafter is described with reference to Figure 31 and 32.Figure 31 is the profilograph that shows according to the ejection head unit of this embodiment.Figure 32 is the sectional view along the ejection head unit of the line N-N of Figure 31.
The declarative description of preamble second embodiment that directly is connected such as the narrow communication passage 11b in liquid circulating passage footpath 11 with the public fluid chamber 7 of fluid jetting head 1 liquid feeding member 10 and be formed on the directly liquid feeding member 10 of the 3rd embodiment of public fluid chamber 7 one sides in 11 of liquid circulating passage such as fin 16.
In the liquid feeding member 10 of the ejection head unit of the 9th embodiment, fluid cushion passage 11c is arranged between the narrow communication passage 11b and fluid jetting head 1 in liquid circulating passage footpath 11.More specifically, perpendicular to from feed port 12 on the cross section of the liquid flow of outlet 13, liquid circulating passage footpath 11 at cardinal principle mid portion (on narrow communication passage 11b) narrower and in the end (at main channel 11a and fluid cushion passage 11c) broad.The fluid cushion passage 11c that forms a wider part is communicated with public fluid chamber 7 by open communication 17.Feed port 12 and outlet 13 are arranged on main channel 11a one side that forms another wider part.
Utilize this structure, the bubble in fluid jetting head 1 and the liquid circulating passage footpath 11 can utilize the circular flow discharge and not destroy meniscus.In addition, fluid cushion passage 11c weakens pressure wave owing to drop sprays, thereby strengthens the stability that drop sprays.
On the cross section perpendicular to longitudinal direction, the top board 11d of the main channel 11a in liquid circulating passage footpath 11 has the convex curve surface shape that is bent upwards.Main channel 11a is by inclined plane 11e and feed port 12 and outlet 13 smooth connections.This structure prevents the generation of eddy flow and separated flow among the 11a of main channel, and can effectively discharge bubble.
As mentioned above, liquid feeding member 10 comprise liquid along and the liquid circulating passage footpath 11 passed through of the parallel direction circulation time of the direction that is in line of the nozzle 5 of fluid jetting head 1.The outlet 13 that feed port 12 that liquid passes through when liquid circulating passage footpath 11 provides and liquid pass through when discharge in liquid circulating passage footpath 11 is arranged on the longitudinal relative end in liquid circulating passage footpath 11.Perpendicular to liquid from feed port 12 on the cross section that flows of outlet 13, liquid circulating passage footpath 11 is narrower and at the end broad at the cardinal principle pars intermedia.The open communication of end and public fluid chamber 7.Feed port 12 and outlet 13 are arranged on another end.Utilize this structure, can discharge the bubble that in fluid jetting head 1, produces or introduce fluid jetting head 1 from the upstream of liquid feed path, prevent that simultaneously the meniscus in the fluid jetting head 1 is destroyed by circular flow.
In addition, the zone with feed port 12 and outlet 13 that produces circular flow has area through reduction to increase the flow velocity of circular flow, keeps the common flow of feed liquid simultaneously, thereby further improves the performance of discharging bubble.The zone of close fluid jetting head 1 has the space of broad, as the cushion space of the fault that prevents to cause owing to the expulsion pressure transmission, thereby further increases jetting stability.
The liquid feeding member 10 of the tenth embodiment of the present invention hereinafter is described with reference to Figure 33 and 34.Figure 33 is the profilograph that shows according to the ejection head unit of this embodiment.Figure 34 is the sectional view along the ejection head unit of the line O-O of Figure 33.
The 3rd embodiment and the 9th embodiment are used to this embodiment, and wherein fin 16 is arranged on the centre in liquid circulating passage footpath 11, and fluid cushion passage 11c is arranged on the top of public fluid chamber 7 simultaneously.
Utilize this structure, the bubble in fluid jetting head 1 and the liquid circulating passage footpath 11 can utilize the circular flow discharge and not destroy meniscus.In addition, fluid cushion passage 11c weakens pressure wave because drop sprays, thereby strengthens the stability that drop sprays.
The liquid feeding member 10 of the 11st embodiment of the present invention hereinafter is described with reference to Figure 35.Figure 35 is the transverse cross-sectional view that shows according to the ejection head unit of this embodiment.
According to the liquid feeding member 10 of this ejection head unit, limiting the 10a of main channel portion of main channel 11a and the narrow communication passage 10b of portion of the narrow communication passage 11b of qualification is the separating member of being made by different materials (element).The narrow communication passage 10b of portion is made by the material with thermal conductivity higher than the material of the 10a of main channel portion.Having more, the preferred embodiment of the material of high-termal conductivity comprises metal material and contains such as silica alumina, boron nitride, magnesia, the resin material of the hot conductive fillers of aluminium nitride and silicon nitride.
When the injection frequency of fluid jetting head 1 increased, the temperature of fluid jetting head 1 was owing to the heat that himself produces increases.Especially, use heater element to show that by the thermal type fluid jetting head of film boiling liquid droplets significant temperature raises.The temperature rise of fluid jetting head 1 improves the temperature of its internal liquid.The temperature fluctuation of injected liquid causes the injection volume of drop and the fluctuation of jet velocity.
In this embodiment, made by the material with high-termal conductivity if the narrow communication passage 10b of portion of liquid feeding member 10 of the narrowest part of the passage of the liquid that will provide to fluid jetting head 1 is provided, then the heat that is produced by fluid jetting head 1 is delivered to the narrow communication passage 10b of portion effectively and is raise to prevent temperature.Help like this to offer fluid jetting head 1 liquid temperature stabilization and obtain the stability that drop sprays.
The liquid feeding member 10 of the 12nd embodiment of the present invention hereinafter is described with reference to Figure 36 and 37.Figure 36 is the drawing in side sectional elevation that shows according to the ejection head unit of this embodiment.Figure 37 is the sectional view along the ejection head unit of the line P-P of Figure 36.
According to the liquid feeding member 10 of this ejection head unit,, comprise the 10a of main channel portion of main channel 11a and comprise that the narrow communication passage 10b of portion of narrow communication passage 11b is the separating member of being made by different materials (element) as the situation of the 11 embodiment.In order further to increase the heat transfer effect of the narrow communication passage 10b of portion, interior fin 15a and exterior piece 15b are separately positioned on the inboard and the outside in liquid circulating passage footpath 11.
This structure has increased and the liquid of 11 inside, liquid circulating passage footpath and the contact area of extraneous air, thereby further helps the stable of temperature.
Be similar to the fin 16 of the 5th embodiment, interior fin 15a is used to reduce the harmful effect of circular flow to fluid jetting head 1.About the orientation of interior fin 15a, on narrow communication passage 11b, as shown in figure 36, the longitudinal direction of interior fin 15a is preferably with parallel to the direction of fluid jetting head 1 from main channel 11a, and is just vertical with circular flow at least.This structure can further reduce the circular flow among the narrow communication passage 11b and need not prevent that bubble from rising from public fluid chamber 7.
The image forming apparatus that hereinafter explanation is comprised the liquid injection apparatus of embodiments of the invention.In the example hereinafter, the liquid injection apparatus of embodiments of the invention is applied to ink jet printer, and this ink jet printer sprays as the ink of liquid and can be applicable to facsimile machine, duplicator and the Multi Role Aircraft with fax and copy function.Yet, it is not ink but DNA sample for example that this liquid injection apparatus can be applied to institute's atomizing of liquids, resist, the fluid jetting head of pattern material or liquid injection apparatus perhaps can be applicable to comprise the such fluid jetting head or the image forming apparatus of liquid injection apparatus.
The image forming apparatus of the 13rd embodiment of the present invention hereinafter is described with reference to Figure 38 to 40.Figure 38 is the schematic diagram of this image forming apparatus.Figure 39 is the schematic diagram of the maintenance/recovery operation of explanation image forming apparatus.Figure 40 is the schematic diagram of explanation liquid feed path.
This image forming apparatus is to comprise that four record shower nozzles 1 (1K, 1C, 1M and 1Y) of the ink that is used for four kinds of different colours (black, dark green, magenta and yellow) are the line printer of fluid jetting head.Each record shower nozzle 1 has the corresponding elongated shape of width of length and maximum sized record-paper.Four record shower nozzles 1 are fixed on the head cartridge 36, so that move up and down together by shower nozzle hoisting mechanism (not shown).
Recording sheet directly transmits so that image is recorded on the recording sheet for 1 time at the record shower nozzle.Recording sheet is stacked in the feedboard 38, is presented one by one by sheet separation/feed mechanism (not shown), is transmitted by sheet material conveyer belt 30, and enter catch tray 39 after finishing record.
Sheet material conveyer belt 30 stretches between band transfer roller 31 and idler roller 32.Sheet material conveyer belt 30 has the double-decker that comprises the resistant layer of making as the high-drag layer of being made by resin material of positive layer with as the resin material by having the carbon that is used for resistance control of back layer.Sheet material conveyer belt 30 contacts with charging roller 33.This charging roller comprises the metal roll body, as the outer field middle resistant layer of metal roll body with as outermost thin high-drag layer.
When high voltage is applied to charging roller 33, discharge near the air gap between sheet material conveyer belt 30 and the charging roller 33 roll gap, so that electric charge is attached on the sheet material conveyer belt 30.If alternating current is applied on the charging roller 33, then sheet material conveyer belt 30 is by alternately positive negative sense charging.When recording sheet was on the sheet material conveyer belt 30 of charging, recording sheet was because electrostatic interaction is attached to sheet material conveyer belt 30.Therefore, recording sheet firmly is attached to sheet material conveyer belt 30 when implementing printing.Therefore, print even also can obtain stable high-quality under the situation of when transmitting sheet material at a high speed, implementing to print.
Each record shower nozzle 1 is such as the described thermal type shower nozzle of second embodiment, and this shower nozzle utilizes heater element 4 to produce expulsion pressure by the ink film boiling described in second embodiment.Record shower nozzle 1 has the side emitter construction, and wherein the central axis that flows to the opening of the direction of spraying energy applying units (heater element portion) and corresponding nozzle 5 in each independent fluid chamber 6 ink inside meets at right angles.
The advantage of this structure not only is to convert the energy efficient that heater element 4 produces to form ink droplet and advance ink droplet energy, and is by presenting the fast quick-recovery meniscus of ink.In addition, this side emitter construction prevents to produce and damage gradually owing to the impact of bubble collapse the so-called cavitation of heater element 4 in the edge emitter construction.This be because in the side emitter construction bubble growth and arrive at nozzle 5 and is communicated with atmosphere, prevent that bubble is owing to temperature decline is shunk.Therefore, the record shower nozzle 1 of side emitter construction has longer service life.
For example, record shower nozzle 1 can utilize following processing step manufacturing.The first, in order to form heater element substrate 2, preparation has the SiO that forms by thermal oxide 2The silicon chip of film.By RF magnetron sputtering deposit HfB 2Film is to form the heat layer that has a resistance on silicon chip.Then, utilize EB evaporation coating technique deposit A1 layer to form electrode layer.Then, adopt photoetching technique nitrate phosphate etching solution etching A1 layer.The heat layer that has a resistance utilizes the RIE etching.In order to expose heater element 4, on other parts outside the part that will be exposed, form the resist film.Do not cover Al on the part of resist film by the etching solution etching.Therefore, heater element 4 is formed between the pair of electrodes.SiO as passivating film 2Layer 2 is formed on the electrothermal transducer.At last, polyimide layer is formed on the part that does not have heater element 4, thereby forms heater element substrate 2.
Then, the dry film of the preparation of the PET by baking coated poly-methyl isopropenyl ketone (ODUR-1010, Tokyo Oka Kogyo Co.Ltd) is by lamination with transfer on the heater element substrate 2.After prebake conditions, implement the pattern exposure of independent fluid chamber 6.Then, utilize methyl iso-butyl ketone (MIBK)/dimethylbenzene=2/1 to implement to develop.Then, contain epoxy resin, the resin compound of sensitization cationic polymerization initiators and silane coupler is dissolved in methyl iso-butyl ketone (MIBK)/xylene solvent mixture with the concentration of 50wt%.This solution is rotated coating to form photosensitive material layer.Thereafter, pattern exposure and the back baking of implementing nozzle 5 handled.Then, utilize methyl iso-butyl ketone (MIBK) to implement to develop to form nozzle 5.
This product immerses methyl iso-butyl ketone (MIBK) with the soluble resin of dissolving residue by applying ultrasonic wave.Then, photosensitive material layer heated 1 hour so that it solidifies fully down at 150 ℃.At last, utilize TMAH (tetramethylammoniumhydroxide (tetramethylammonium hydroxide)) solution to form public fluid chamber 7 by anisotropic etching silicon.In order to prevent to damage acquired fluid chamber member, the passivation layer of being made by thermoprene forms the silicon substrate of nozzle 5 one sides with protection surface is set.
By above-mentioned steps, linear pattern record shower nozzle 1 can create has 600dpi/ row, 2400CH/ row (2400 nozzles 5 of expression one row), the nozzle row of 240 μ m at interval, maximum public fluid chamber 7 A/Fs of about 18mm and the length of about 110mm.
The liquid feeding member 10 that liquid feeding member 10 used herein is second embodiment.Have the cross sectional shape shown in Figure 11 to 13 path (liquid circulating passage footpath 11) parts by cut transparent polycarbonate resin and thereon gluing form, then it is adhered on the fluid jetting head 1.With reference to Figure 11 to 13, the inside dimension of liquid feeding member 10 for example is, Wa:5mm, Wb:2.4mm, Ha:6mm, Hb:4mm, Yb:1.5mm and Ls:5mm.Feed port 12 and outlet 13 locate to be arranged on the opposite end of liquid feeding member 10 in the cross-section center (in the position of Yh:3mm) of main channel 11a, and are connected with ink feed system in the liquid feed path as shown in figure 40.
In this liquid feed path (liquid feeder system), shower nozzle groove 70 is set to have to record shower nozzle 1 and presents ink and receive bubble and it is discharged to outside function.Shower nozzle groove 70 comprises that first inking chamber 71 and top have second inking chamber 72 of atmosphere opening 73.Pump P2 can send ink to first inking chamber 71 from second inking chamber 72.Ink cartridge 76 is connected with second inking chamber 72, makes the ink that has been filtered by filter 75 can be provided to second inking chamber 72 of shower nozzle groove 70 by pump P1.
In the bottom of second inking chamber 72 of shower nozzle groove 70 are the ink ports that are connected with the outlet 13 of the liquid feeding member 10 of record shower nozzle 1 by normally open valve V2.The volume of the ink in second inking chamber 72 makes the difference in height Sh between ink level and the record shower nozzle 1 remain definite value (10-150mm) by liquid level sensor 74 controls.
Form operating period at common image, pump P1 and P2 stop, and only valve V2 opens.Ink offers record shower nozzle 1 by outlet 13 from second inking chamber 72.Ink level in second inking chamber 72 is owing to using ink to drop under the precalculated position, and this descends and is detected by liquid level sensor 74.In response, valve V1 opens, and pump P1 is actuated to provide ink from ink cartridge 76 to second inking chamber 72.This provides the detection signal according to liquid level sensor 74 to stop.
The recovery operation of under the situation that record shower nozzle 1 gets clogged, writing down shower nozzle 1.Record shower nozzle 1 moves from position shown in Figure 38, and maintenance unit 35 moves horizontally (right side from position shown in Figure 38 to Figure 38) to the position that is located immediately at record shower nozzle 1 below.Write down shower nozzle 1 then and move down slightly, as shown in figure 41, the nozzle face 5a of the nozzle 5 of record shower nozzle 1 is closely contacted with cap 40 by maintaining part 43 maintenances of maintenance unit 35.Then, valve V1 and V2 close, and only pump P2 is actuated the preset time cycle.
Therefore, the ink in first inking chamber 71 is pressurized to flow into record shower nozzle 1.Because valve V2 is closed, ink is discharged from the nozzle 5 of record shower nozzle 1.With ink, the impurity of bubble and obstruction record shower nozzle 1 is removed.After pump P2 stopped, record shower nozzle 1 moved up to disengage with cap 40.Then, maintenance unit moves horizontally (from right side to Figure 39, position shown in Figure 39) to utilize the nozzle face 5a of scraping blade 41 wipings record shower nozzle 1 as shown in figure 41.After forming meniscus because of wiping in nozzle 5, valve V2 opens so that write down shower nozzle 1 and keep having difference in height Sh under negative pressure.
Cap 40, collect and aspirate to enter waste liquid cabinet 44 from the ink that record shower nozzle 1 is discharged by pump 45.In alternate embodiment, the ink in the cap 40 can utilize filter to filter but be not transported to waste liquid cabinet 44 and second inking chamber 72 that returns shower nozzle groove 70 to utilize again.
Then, record shower nozzle 1 and maintenance unit 35 vertical respectively with move horizontally and return position shown in Figure 38 to write down operation.Perhaps, record shower nozzle 1 and maintenance unit 35 can be parked in position shown in Figure 39 and wait for recording instruction.It is in good condition with the shower nozzle 1 of holding the record that recovery operation removes deoppilation.
In liquid feeder system as shown in figure 40, the runner 80 and 81 that connects shower nozzle groove 70 and liquid feeding member 10 is generally pitch tube, and bubble entered inside because of the gas permeability of tubing along with past of time.If a large amount of bubbles are accumulated in liquid feeding member 10 inside, then bubble by the mobile record shower nozzle 1 of bringing into of ink, causes the ink droplet jet fault in the record operating process.With reference to Figure 40, in order to remove bubble from liquid feeding member 10, valve V2 opens, and only pump P2 is actuated to present ink from second inking chamber 72 to first inking chamber 71.Then, second inking chamber 72 discharged and be back to ink with bubble from outlet 13 from the feed port 12 of first inking chamber, 71 influent feeding members 10.In second inking chamber 72, the bubble in the ink rises to discharge from atmosphere opening 73.
For the performance of the discharge bubble of the liquid feeding member 10 of evaluate image forming device, bubble is introduced pipeline by the triple valve of liquid feeding member 10 upstream sides, introduces liquid feeding member 10 by pump P2 then, observes the inside of liquid feeding member 10 simultaneously.Pump P2 stops and waiting for mobile the stopping of liquid feeding member 10 inside.Then, pump P2 restarts and makes ink circulation with 60ml/ minute flow rate.As a result, though the corner stops a small amount of bubble on liquid feeding member 10, most of bubble can be discharged.In addition, do not observe such as the fault of ink from nozzle 5 seepages in the nozzle face of record shower nozzle 1, image forms and can ideally carry out under the situation of ejection failure not having.
Then, after bubble was introduced liquid in the same way and presented chamber 10, ink was with 90ml/ minute flow rate circulation.As a result, under these conditions, the discharge of bubble can normally be carried out, and bubble once stopped on the corner do not have bubble.Yet finding has ink from nozzle 5 seepages.
Then, utilize liquid feeding member 10 to carry out bubble in the same way and discharge experiment, this liquid feeding member 10 has the make progress vertically disposed feed port 12 and the outlet 13 (Yh1:1mm) of shown in the 7th embodiment (Figure 24 and 25).As a result, though ink with the situation of 90ml/ minute flow rate circulation under the discharge of bubble also can normally carry out and not have the fault of ink from nozzle 5 seepages.
Another experiment is carried out on liquid feeding member 10, this liquid feeding member 10 comprises the main channel 11a (Wa:5mm with the triangular cross-sectional shape that makes progress through the last corner and the summit of chamfering shown in the 6th embodiment (Figure 23), Wb:2.4mm, Ha:6mm, Hb:4mm, Yh:3mm, Yc:1.5mm and Wc:1mm).As a result, though ink with the situation of 60ml/ minute flow rate circulation under the discharge of bubble also can normally carry out and not have the fault of ink from nozzle 5 seepages.
In contrast test, bubble is discharged experiment and is carried out on the liquid feeding member shown in comparative example 1 (Fig. 6 and 7) (Wc:5mm, Hc:6mm and Yh:3mm), and this liquid feeding member comprises liquid circulating passage footpath 11 and do not have narrow communication passage 11b.As a result, though bubble can be discharged from ink circulation by the flow rate with 60ml/ minute, find that ink is from nozzle 5 seepages.Even by reducing circulation flow-rate or the position of move up feed port 12 and outlet 13 also can have ink to discharge bubble under the situation of nozzle 5 seepages.
In another contrast experiment, the bubble discharging performance of liquid feeding member is assessed in the same way, this liquid feeding member comprises liquid circulating passage footpath 11 (Wd:5mm, Hd:12mm and the Yh:3mm) with the height through increasing shown in comparative example 2 (Fig. 8 and 9).As a result, obtaining the satisfied required flow rate of bubble discharging performance is 120ml/ minute or bigger.In addition, under the situation that second inking chamber, the 72 ink inside liquid levels of shower nozzle groove 70 are low in bubble discharging operation process, though uncommon, some nozzles 5 can not spray because of ruined meniscus.
Have at needs under the situation in such liquid circulating passage footpath 11 of height through increasing, the structure shown in the 9th embodiment (Figure 31 and 32) is effective.In the liquid feeding member 10 of the 9th embodiment, the fluid cushion passage 11c with large space limit liquid circulating passage footpath 11 near the part of shower nozzle 1.Narrow communication passage 11b and main channel 11a are set on fluid cushion passage 11c.The bubble that has produced and flowed into public fluid chamber 7 in shower nozzle 1 rises to the top board 11d of main channel 11a because of buoyancy.Because the upper surface of fluid cushion passage 11c is the inclined plane, so bubble can shift out from fluid cushion passage 11c easily.In addition, because the top board 11d of main channel 11a has the protruding shape of cross section that is bent upwards, so bubble is collected in top and can discharging easily.
Utilize this structure, because the position of circular flow separates with record shower nozzle 1, so circular flow can be lowered the influence of record shower nozzle 1.In addition, main channel 11a can be too narrow to have and can obtain to write down the speed of the smallest cross-section area of required flow with the increase circular flow, thereby improves the bubble discharging performance.In addition, because the expulsion pressure of record shower nozzle 1 weakens because of the large volume buffer part (fluid cushion passage 11c) that qualification approaches to write down the part of shower nozzle 1, so this structure reduces to write down the influence that the expulsion pressure of shower nozzle 1 causes effectively.In this, this structure is for especially effective from the piezo-electric type shower nozzle of a nozzle ejection different size drop.
Liquid feeding member shown in Figure 31 and 32 is produced, and this liquid feeding member is of a size of Wia:5mm, Wic:2.4mm, and Hia:4mm, Hib:4mm, Hie:6mm and Yh:2mm, its bubble discharging performance is to assess with above-mentioned same mode.As a result, can discharge all bubbles with 60ml/ minute flow rate and do not destroy the meniscus of nozzle 5.In addition, can be in the ink circulation operation of carrying out discharging when image forms bubble.
In the above-described embodiments, because in liquid feeding member 10, filter is not set, though therefore when the result as the duplicate record operation produces bubble in record shower nozzle 1 bubble also be moved upwards up to main channel 11a and discharge by the circulation ink by narrow communication passage 11b.On the contrary, be arranged under the situation of the liquid feeding member 10 between narrow communication passage 11b and the main channel 11a at filter 14 as shown in figure 30, may do not accumulate by filter 14 and in narrow communication passage 11b as the bubble that the result of duplicate record operation produces in record shower nozzle 1.Aforesaid recovery operation is the unique method of discharging bubble.
As mentioned above, in an embodiment of the present invention, the part of the liquid feeding member that is communicated with fluid jetting head 1 is narrowed down, to prevent the harmful effect of circular flow to nozzle meniscus.Therefore, in the record operating process, can have circular flow.Because can in the circulation ink, write down operation, therefore can prevent accumulating of bubble.That is, needn't end record and remove to carry out the bubble discharging operation, consequently increase record quantity.
The image forming apparatus of the 14th embodiment of the present invention hereinafter will be described.
Use the liquid feeding member (Figure 17 to 19) of the 4th embodiment in this embodiment.Have the cross section shown in Figure 18 and 19 path (liquid circulating passage footpath 11) parts by cutting clear polycarbonate resin and thereon gluing make and it be adhered on the fluid jetting head 1.With reference to Figure 19, the inside dimension of this liquid feeding member 10 is, for example Wa:7mm, Ha:6mm, Hb:4mm, Yb:1.5mm and Ls:5mm.As fin 16, each thickness be three fin 16a of 0.4mm be arranged on the opening that leads to public fluid chamber 7 with the spacing of 0.9mm each vertically on the end, each thickness is two fin 16b of 0.5mm are arranged on this opening with the spacing of 0.9mm each cross side.
Feed port 12 and outlet 13 are arranged on the longitudinal relative end of liquid feeding member 10.As under the situation of the image forming apparatus of the 13 embodiment, liquid feeding member 10 is connected to ink feed system (in the liquid feed path) as shown in figure 40.The performance of the discharge bubble of the liquid feeding member 10 of this embodiment is evaluated.As a result, the bubble of specially introducing liquid feeding member 10 can normally be discharged ink circulation by the flow rate with 70ml/ minute.In addition, do not observe such as the fault of ink from nozzle 5 seepages, image forms and can ideally carry out and do not have an ejection failure.
The image forming apparatus of the 15th embodiment of the present invention hereinafter also is described with reference to Figure 43.
In this embodiment, the liquid feeding member of the image forming apparatus of the 14 embodiment is connected to the ink feed system in as shown in figure 41 the liquid feed path.This ink feed system is arranged on the downstream of the outlet 13 of liquid feeding member 10 with the different flow regulator V3 that are of ink feed system shown in Figure 40.
Being provided with of the flow regulator V3 in outlet 13 downstreams allows the flow rate (Qc) of adjusting from the ink of outlet 13 discharges.This ink can be pressed into fluid jetting head 1 from liquid circulating passage footpath 11 by reducing flow rate Qc.Therefore, can discharge bubble from liquid circulating passage footpath and fluid jetting head 1 simultaneously.
The instantiation of the liquid feeding member 10 of the 11 embodiment shown in Figure 35 and the 12 embodiment shown in Figure 36 and 37 hereinafter will be described.
Though the inside dimension of the liquid feeding member 10 of this instantiation is identical with the liquid feeding member 10 of the image forming apparatus of the 13 embodiment, liquid feeding member 10 is made by two kinds of different materials.More particularly, comprise that the 10a of main channel portion of main channel 11a is made by polycarbonate resin, and comprise that the 10b of narrow passage portion of narrow communication passage 11b is made by SUS.Fluid jetting head 1 used herein is the thermal type shower nozzle that uses in the image forming apparatus of the 13 embodiment.
Under the situation of thermal type shower nozzle, because the temperature of fluid jetting head 1 significantly increases, therefore the driving frequency of end fluid jetting head 1 falls usually, supspend record, or reduce the quantity that is driven nozzle.Under the situation of this liquid feeding member 10, because the narrow communication passage 10b of portion of fluid jetting head 1 one sides is made by the material with high-termal conductivity, if therefore be arranged to directly contact with fluid jetting head 1, the then narrow communication passage 10b of portion can directly transmit heat and prevent that the temperature of fluid jetting head 1 from raising from fluid jetting head 1.In addition, owing to the narrow portion of stream is made by the material of high thermal conductivity, even therefore when writing down operation continuously, also can transmit heat and keep stable image to form performance from ink effectively.
Be arranged at a plurality of fin 15a and 15b shown in the 12 embodiment (Figure 36 and 37) under the situation in the inboard of the narrow communication passage 10b of portion of liquid feeding member 10 and the outside, heat transfer efficiency is further improved, and allows the image of the high print quality of flying print.Therefore in addition, in this liquid feeding member 10,, heat transfer efficiency can be improved and the bubble 51 that do not interrupt moving up from fluid jetting head 1 because the vertical direction of the fin 15a of stream inside limits its longitudinal direction.And, because the fin 15a of stream inside, therefore can prevent the mobile and minimizing that causes because of the circular flow among the narrow communication passage 11b effectively perpendicular to the flow direction of circular flow and because fin 15a also is set at the bottom of main channel 11a and destroy because of the meniscus that circular flow causes.
The instantiation of the liquid feeding member 10 of the 8th embodiment as shown in figure 28 hereinafter will be described.
In this liquid feeding member 10, as mentioned above, feed port 12 is arranged on the longitudinal center portion of liquid feeding member 10, and outlet 13 is arranged on longitudinal end.Guide of flow member 18 be arranged on feed port 12 in the liquid circulating passage footpath 11 below.Guide of flow member 18 has curved upper surface so that the liquid stream towards two outlets 13 on different directional smoothing ground the ink stream that is provided is provided, and following (end) surface 19 with inclination stops thereon from the bubble that fluid jetting head 1 moves up preventing.
This liquid feeding member 10 is connected to as Figure 40 or ink feed system shown in Figure 30, and the bubble discharging performance is with identical circulation flow-rate assessment.As a result, can in situation less time, discharge bubble than the image forming apparatus of the 13 embodiment.In the contrast experiment, the liquid feeding member that does not have the guide of flow member as shown in figure 29 prepares in the same way and assesses.As a result, a small amount of bubble often rests on the regional Q of Figure 29.Meniscus in central authorities in the nozzle 5 is often destroyed.
The ejection head unit 9100 that hereinafter comprises the 16th embodiment of the present invention of the liquid feeding member 920 that is used for fluid jetting head 91 with reference to Figure 44 to 48 explanation.Figure 44 is the perspective view that shows the integrated ejection head unit 9100 that comprises fluid jetting head 91 and liquid feeding member 920.Figure 45 is the longitudinal sectional drawing that shows ejection head unit 9100.Figure 46 is the sectional view along the line B-B of Figure 47 that schematically shows ejection head unit 9100.Figure 47 is the sectional view along the ejection head unit 9100 of the line A-A of Figure 45.Figure 48 is the amplification transverse cross-sectional view of fluid jetting head 91.In Figure 46 and some other accompanying drawing, fluid jetting head 91 is shown by dotted line for illustrative purposes.
Ejection head unit 9100 is the long shower nozzles such as the line style shower nozzle, and as integrated unit, this ejection head unit comprises a plurality of short fluid jetting heads 91 (91a-91f) (in this example, the quantity of fluid jetting head 91 is 6, but is not limited thereto).Fluid jetting head 91 is in the elongation of the longitudinal direction of ejection head unit 9100, and on perpendicular to the direction of longitudinal direction each other vertical misalignment ground arrange i.e. setting with being staggered.
Each fluid jetting head 91 is thermal type shower nozzles and comprises heater element substrate 92 and flow channel substrate 93.The independent fluid chamber 96 that flow channel substrate 93 is equipped with a plurality of nozzles 95 that are used for liquid droplets and is communicated with corresponding nozzle 95.Heater element substrate 92 is equipped with the heater element 94 corresponding with independent fluid chamber 96.Power supply unit (not shown) such as FPC is connected with heater element substrate 92.When pulse voltage when power supply unit is applied to heater element 94, heater element 94 is driven, and causes the liquid film boiling in the independent fluid chamber 96, thus from nozzle 5 liquid droplets.With reference to Figure 47 and 48, form two row's nozzles in this embodiment, every row's nozzle comprises a plurality of nozzles 95 that are in line along the longitudinal direction of fluid jetting head 91.With reference to Figure 45 to 47, the independent fluid chamber 96 corresponding with nozzle 95 receives from the liquid that is arranged on the public fluid chamber 97 in the middle of the heater element substrate 92.
Shown in Figure 45 and 46, liquid feeding member 920 is connected with the opening of the public fluid chamber 97 of the heater element substrate 92 that forms fluid jetting head 91.Though liquid feeding member 920 is connected with fluid jetting head 91 among this embodiment, can be arranged between the two such as the parts of demarcation strip.
Liquid feeding member 920 comprises two independently fluid passages (liquid circulating passage footpath), and promptly the main channel 921,921, and liquid flows along the longitudinal direction by this passage.A main channel (fluid passage) 921 and a discharge opeing body shower nozzle 91a, 91b and 91c correspondence, another main channel (fluid passage) 921 and discharge opeing body shower nozzle 91d, 91e and a 91f correspondence.The outlet 913 that feed port 912 that liquid passes through when fluid passage 921 provides and liquid pass through when fluid passage 921 is discharged is arranged on the longitudinal relative end of each fluid passage 921.
As mentioned below, liquid feeding member 920 be arranged on make liquid from feed port 912 to outlet 913 circular flows cross the liquid feed path (not shown) of each main channel 921.In Figure 45 and some other figure, point to the arrow of feed port 912 and the arrows that outwards point to from outlet 913 direction introduced of express liquids and the liquid direction of discharging respectively.
The narrow communication passage 922 that each all has the cross section aperture area (small bore long-pending) littler relatively than main channel 921 is set between each public fluid chamber 97 and the corresponding main channel 921.Each narrow communication passage 922 limits the open communication that liquid leads to the public fluid chamber 97 of corresponding fluid jetting head 91.Term used herein " cross section aperture area " expression shown in the cross sectional side view of Figure 46 at aperture area perpendicular to the cross section on the direction (horizontal direction of liquid feeding member 920) of the longitudinal direction of liquid feeding member 920 (direction that the nozzle 95 of each fluid jetting head 91 is in line produces the direction of circular flow).
That is, in order to arrive at fluid jetting head 91, liquid flows into main channel 921 from feed port 912, by narrow communication passage 922, and is provided to public fluid chamber 97.If bubble is introduced liquid feeding member 920 from the upstream of fluid jetting head 91 or the upstream of feed port 912, then bubble is because buoyancy is accumulated in the top (top board 921d) of main channel 921.In order to prevent such the accumulating of bubble, in main channel 921, produce from feed port 912 to the flowing of outlet 913, thereby discharge bubbles from outlet 913.As shown in figure 47, the narrow communication passage 922 of each that is communicated with fluid jetting head 91 has the width littler than main channel 921, thus prevent from narrow communication passage 922, to produce with main channel 921 in produce mobile identical mobile.Therefore, can prevent to be used to discharge the circular flow negative effect fluid jetting head 91 of bubble.
Each main channel 921 has the sectional area bigger than the part 921b between the adjacent fluid jetting head 91 at the part 921a above the fluid jetting head 91.In other words, each main channel 921 as fluid passage has than the bigger cross section aperture area in the zone between the adjacent public fluid chamber 97 (middle public fluid chamber part 921b) at the zone that is connected with public fluid chamber 97 (public fluid chamber coupling part 921a).More particularly, the height H g of each public fluid chamber coupling part 921a and width W g respectively greater than the height H h of public fluid chamber part 921b in the middle of each and width W h (Hg〉Hh, Wg〉Wh).
In the main channel 921 with such structure, the flow velocity of circular flow is relatively low near fluid jetting head 91, and the result prevents that the meniscus of nozzle 95 of fluid jetting head 91 is destroyed.In addition, the flow velocity of circular flow is higher relatively between fluid jetting head 91, and the result strengthens the performance of discharging bubble.In this embodiment, main channel 921 has the height of variation and the width of variation, makes public fluid chamber coupling part 921a have different cross section aperture areas with middle public fluid chamber part 921b.Yet, even under main channel 921 has any one situation in the width of the height of variation and variation, also can obtain identical advantage.
In addition, in this embodiment, with fluid jetting head 91a, the liquid in the main channel 921 of 91b and 91c correspondence and with fluid jetting head 91d, the liquid in the main channel 921 of 91e and 91f correspondence flows with opposite direction.Yet they can flow with identical direction.Liquid feeding member 920 can comprise a plurality of parts.Especially, under the situation that the parts that limit narrow communication passage 922 are made by the material with high-termal conductivity, fluid jetting head 91 and liquid wherein can carry out heat transmission effectively, and the result strengthens the stability that drop sprays.
As mentioned above, liquid feeding member 920 comprise liquid along and the fluid passage 921 that passes through of the parallel direction of the direction that is in line of the nozzle 95 of fluid jetting head 91.The outlet 913 that feed port 912 that liquid passes through when fluid passage 921 provides and liquid pass through when fluid passage 921 is discharged is arranged on the longitudinal relative end of fluid passage 921.Fluid passage 921 has than the regional big cross section aperture area between the adjacent public fluid chamber 97 in the zone that is connected to public fluid chamber 97.Utilize this structure, can discharge the bubble that produces in the fluid jetting head 91 or introduce fluid jetting head 91 from the upstream of liquid feed path, prevent that simultaneously the meniscus in the fluid jetting head 91 is destroyed by circular flow.
The ejection head unit 9100 of the 17th embodiment of the present invention hereinafter is described with reference to Figure 49.Figure 49 is the longitudinal sectional drawing that shows according to the ejection head unit of this embodiment.
In this embodiment, feed port 912 is arranged on the cardinal principle central authorities of each main channel 921 of liquid feeding member 920, and outlet 913,913 is arranged on longitudinal relative end.Utilize this structure, even the physical length of peripheral passage (main channel 921) still can be because of 921 the feed port 912 that is provided with reduces along the main channel under the situation that the length (length of liquid feeding member 920) of main channel 921 increases midway.Therefore, discharge the time decreased that bubble spent, the result strengthens the efficient of discharging bubble.
In this embodiment, because feed port 912 is positioned at the top of fluid jetting head 91, therefore being used for guiding liquids is arranged between feed port 912 and the narrow communication passage 922 (the public fluid chamber 97 of fluid jetting head 91) to the guide of flow member 918 that outlet 913,913 flows from feed port 912.Guide of flow member 918 form inclined plane 919 with public fluid chamber 97 facing surfaces, in order to avoid catch the bubble that rises from public fluid chamber 97.
Utilize this structure, the liquid of introducing from feed port 912 flow that 921 longitudinal direction is crooked smoothly along the main channel as shown by arrows.Can prevent from so directly to flow to fluid jetting head 91, thereby prevent harmful effect the meniscus of the nozzle 95 of fluid jetting head 91 from the liquid that feed port 912 high flow rates are introduced.
In comparative example 6 as shown in figure 50, guide of flow member 918 is not set.In this case, the liquid of introducing from feed port 912 directly flows to narrow communication passage 922 as shown by arrows and the public fluid chamber 97 of fluid jetting head 91 is produced harmful effects.On the other hand, in this embodiment, the setting of guide of flow member 918 has prevented such problem.
As mentioned above, liquid feeding member 920 comprise liquid along and the fluid passage 921 that passes through of the parallel direction of the direction that is in line of the nozzle 95 of fluid jetting head 91.Each outlet 913,913 that feed port 912 that liquid passes through when fluid passage 921 provides and liquid pass through when fluid passage 921 is discharged is set up.Feed port 912 is arranged on the part of on-liquid passage 921 vertical ends.The guide of flow member 918 that guiding liquids flows is arranged between the feed port 912 that is provided with on the part of public fluid chamber 97 and this non-vertical end.Fluid passage 921 has than the regional big cross section aperture area between the adjacent public fluid chamber 97 in the zone that is connected to public fluid chamber 97.Utilize this structure, can discharge the bubble of introducing fluid jetting head 91 from the upstream of liquid feed path, prevent that simultaneously the meniscus in the fluid jetting head 91 is destroyed by circular flow.In addition, in the dysgenic while that prevents the meniscus of the nozzle 95 of fluid jetting head 91,, can strengthen the efficient of discharging bubble because of the physical length of liquid feeding member 920 through reducing.
In this embodiment, feed port 912 is not arranged on vertical end of liquid feeding member 920 and is arranged on towards the position of public fluid chamber 97.Perhaps, outlet 913 can be arranged on towards the position of public fluid chamber 97, and feed port 912,912 can be arranged on vertical end.Perhaps in addition, feed port 912 and outlet 913 all can be arranged on towards the position of public fluid chamber 97.
Hereinafter the 18th embodiment of the present invention is described with reference to Figure 51.Figure 51 is the longitudinal sectional drawing that shows according to the ejection head unit of this embodiment.
In this embodiment, feed port 912 and outlet 913 are not arranged on the longitudinal relative end of main channel 921 and are arranged on the position (promptly being arranged on the position of the public fluid chamber part 921b towards the centre) of non-public fluid chamber 7 towards fluid jetting head 91.In addition, another feed port 912 and another outlet 913 are arranged on longitudinal relative end.Utilize this structure, though under the situation that the length (length of liquid feeding member 920) of main channel 921 increases feed port 912 and outlet 913 921 setting midway also can reduce the physical length of peripheral passage (main channel 921) along the main channel.Therefore, discharge the time decreased that bubble spent, the result has strengthened the efficient of discharging bubble.
Because be not arranged on the feed port 912 of longitudinal relative end of main channel 921 and position that outlet 913 is arranged on the public fluid chamber part 921b towards the centre and separate with fluid jetting head 91, therefore though not have to be provided with guide of flow member 918 as shown in figure 17, but still can prevent the liquid stream introduced from feed port 912 and flow harmful effect to the meniscus of the nozzle 95 of fluid jetting head 91 from the liquid that outlet 913 is discharged.
As mentioned above, liquid feeding member 920 comprise liquid along and the fluid passage 921 that passes through of the parallel direction of the direction that is in line of the nozzle 95 of fluid jetting head 91.The outlet 913 that feed port 912 that fluid passage 921 outfit liquid pass through when fluid passage 921 provides and liquid pass through when fluid passage 921 is discharged.At least any one in feed port 912 and the outlet 913 be not arranged on fluid passage 921 vertically end go up and be arranged on the position in a zone in the zone between the adjacent public fluid chamber 97.Fluid passage 921 has than the regional big cross section aperture area between the adjacent public fluid chamber 97 in the zone that is connected to public fluid chamber 97.Utilize this structure, can discharge the bubble of introducing fluid jetting head 91 from the upstream of liquid feed path, prevent that simultaneously the meniscus in the fluid jetting head 91 is destroyed by circular flow.In addition, in the dysgenic while that prevents the meniscus of the nozzle 95 of fluid jetting head 91,, can strengthen the efficient of discharging bubble because of the physical length of liquid feeding member 920 through reducing.
In this embodiment, feed port 912 and outlet 913 all are not arranged on longitudinal relative end and are arranged on the position of the public fluid chamber part 921b towards the centre.Perhaps, any one in feed port 912 and the outlet 913 can not be arranged on longitudinal relative end and be arranged on the position of the public fluid chamber part 921b towards the centre.
Hereinafter with reference to Figure 52 to 54 explanation 19th embodiment of the present invention.Figure 52 is the longitudinal sectional drawing that shows according to the ejection head unit of this embodiment.Figure 53 is the sectional view along the line D-D of Figure 54.Figure 54 is the sectional view along the ejection head unit of the line C-C of Figure 52.
In this embodiment, different with previous embodiment, liquid feeding member 920 does not comprise narrow communication passage 922.As an alternative, fin 916 liquid feeding member 920 be formed on the wall of the public fluid chamber 97 of fluid jetting head 91 each open communication 917 around.
If bubble is introduced liquid feeding member 920 from the upstream of fluid jetting head 91 or the upstream of feed port 912, then bubble is because buoyancy is accumulated in the top (top board 921d) of each main channel 921.In order to prevent such the accumulating of bubble, in main channel 921, produce from the liquid stream of feed port 912, thereby discharge bubble from outlet 913 to outlet 913.
Because the contact area between the liquid at the 921a place, public fluid chamber coupling part of the main channel 921 of main channel 921 and fluid jetting head 91 1 sides increases, so liquid is because its viscosity resistance is difficult for mobile.As a result, similar to the 16th embodiment of the present invention, liquid is side flow on main channel 921 only basically.Therefore, the liquid flow of the public fluid chamber coupling part 921a of main channel 921 does not influence near the liquid flow the open communication 917, and the circular flow of discharging bubble can be reduced the harmful effect of the meniscus of the nozzle 95 of fluid jetting head 91.In this embodiment, the first type surface of fin 916 is parallel with the direction of circular flow.In alternate embodiment, the first type surface of fin 916 can be vertical with the direction of circular flow.
In this embodiment, each main channel 921 has the sectional area bigger than the part 921b between the adjacent fluid jetting head 91 at the part 921a above the fluid jetting head 91.In other words, each main channel 921 as fluid passage has than the bigger cross section aperture area in the zone between the adjacent public fluid chamber 97 (regional 921b) in the zone (part 921a) that is connected with public fluid chamber 97.Utilize this structure, the flow velocity of circular flow is relatively low near fluid jetting head 91, and the result prevents that the meniscus of nozzle 95 of fluid jetting head 91 is destroyed.In addition, the flow velocity of circular flow is higher relatively between fluid jetting head 91, and the result strengthens the performance of discharging bubble.
As mentioned above, liquid feeding member 920 comprise liquid along and the fluid passage 921 that passes through of the parallel direction of the direction that is in line of the nozzle 95 of fluid jetting head 91.The outlet 913 that feed port 912 that liquid passes through when fluid passage 921 provides and liquid pass through when fluid passage 921 is discharged is arranged on the longitudinal relative end of fluid passage 921.In fluid passage 921, fin 916 be formed on each open communication 917 of connecting with corresponding public fluid chamber 97 around.Utilize this structure, can discharge the bubble that produces in the fluid jetting head 91 or introduce fluid jetting head 91 from the upstream of liquid feed path, prevent that simultaneously the meniscus in the fluid jetting head 91 is destroyed by circular flow.
Hereinafter with reference to Figure 55 to 57 explanation 20th embodiment of the present invention.Figure 55 is the longitudinal sectional drawing that shows according to the ejection head unit of this embodiment.Figure 56 is the sectional view along the line D-D of Figure 57.Figure 57 is the sectional view along the ejection head unit of the line C-C of Figure 55.
The liquid feeding member 920 of this embodiment comprises a main channel 921 that is communicated with all six fluid jetting heads 91.This structure increases the inner space of main channel 921, so that parts portion's formation within it easily as required.
Utilize the advantage of this structure, the narrow communication passage 922 that allows to be communicated with between main channel 921 and the fluid jetting head 91 is formed in the main channel 921 outstanding.This structure allows the size of liquid feeding member 920 to reduce.In addition, narrow communication passage 922 can reduce the harmful effect of circular flow to the meniscus in the nozzle 95 of fluid jetting head 91.
In this embodiment, because the opening of narrow communication passage 922 is positioned at the center of the high main channel of the flow rate of circular flow 921, therefore the fin 916 that has than narrow communication passage 922 bigger height is set.Each fin 916 comprises that the opening with respect to the narrow communication passage 922 of correspondence is arranged on the fin 916a of upstream and downstream, 916a.Each fin 916 also comprises opening one side that is arranged on narrow communication passage 922 and the fin 916b that is parallel to liquid flow direction, 916b.Fin 916 slows down the open communication place to the flowing of the circular flow of public fluid chamber 97, thereby more effectively reduces the harmful effect to fluid jetting head 91.
Under the situation of the structure of the comparative example that does not possess fin 916 7 shown in Figure 58 to 60, because the opening of narrow communication passage 922 is positioned at the center of the high main channel of the flow rate of circular flow 921, therefore the 922 pairs of public fluid chamber 97 of narrow communication passage that flow through of main channel 921 produce harmful effect and destroy meniscus, may cause liquid from nozzle 95 seepages.The setting of fin 916 has reduced near the flow velocity of the liquid of opening, prevents such fault.
In this embodiment, has the gap between each fin 916 and the narrow communication passage 922.In alternate embodiment, fin 916 can form with the part that limits opening is whole.
As mentioned above, liquid feeding member 920 comprise liquid along and the fluid passage 921 that passes through of the parallel direction of the direction that is in line of the nozzle 95 of fluid jetting head 91.The outlet 913 that feed port 912 that liquid passes through when fluid passage 921 provides and liquid pass through when fluid passage 921 is discharged is arranged on the longitudinal relative end of fluid passage 921.In fluid passage 921, fin 916 be formed on each open communication 917 of connecting with corresponding public fluid chamber 97 around.Utilize this structure, can discharge the bubble that produces in the fluid jetting head 91 or introduce fluid jetting head 91 from the upstream of liquid feed path, prevent that simultaneously the meniscus in the fluid jetting head 91 is destroyed by circular flow.
Hereinafter with reference to the Figure 61 and the 62 explanation 21st embodiment of the present invention.Figure 61 is the vertical schematic diagram that shows according to the ejection head unit of this embodiment.Figure 62 is the plane of ejection head unit.
In the liquid feeding member 920 of this embodiment, except the feed port 912 and outlet 913 of vertical end, also have two feed port 912 and two outlets 913 be arranged on main channel 921 midway not towards the position of fluid jetting head 91.All feed port 912 and outlet 913 can utilize simultaneously, perhaps can optionally utilize the combination of needed a plurality of opennings.The setting of a plurality of opennings can be discharged bubble from fat pipe in many ways effectively.
In this embodiment, the outlet of introducing the feed port 912 of liquid and discharging liquid is arranged on not the position towards fluid jetting head 91.In addition, the fin 916 with height bigger than narrow communication passage 922 is set around the narrow communication passage 922 that is communicated with fluid jetting head 91.Therefore, can prevent the harmful effect of the circular flow that forms according to multiple bubble discharge mode to the meniscus of the nozzle 95 of fluid jetting head 91.Therefore, can when discharging bubble, discharge drop from fluid jetting head 91.
As mentioned above, liquid feeding member 920 comprise liquid along and the fluid passage 921 that passes through of the parallel direction of the direction that is in line of the nozzle 95 of fluid jetting head 91.The outlet 913 that feed port 912 that fluid passage 921 outfit liquid pass through when fluid passage 921 provides and liquid pass through when fluid passage 921 is discharged.In feed port 912 and the outlet 913 any one is not arranged in the part of public fluid chamber 97.In fluid passage 921, fin 916 is arranged on around each open communication that is connected with public fluid chamber 97.Utilize this structure, can discharge the bubble of introducing fluid jetting head 91 from the upstream of liquid feed path, prevent that simultaneously the meniscus in the fluid jetting head 91 is destroyed by circular flow.In addition, in the dysgenic while that prevents the meniscus of the nozzle 95 of fluid jetting head 91, can strengthen the efficient of discharging bubble because of the physical length through reducing of liquid feeding member 920.
In this embodiment, if any one in feed port 912 and the outlet 913 is positioned at towards the position of public fluid chamber 97, then can guide of flow member 918 be set as the 18 embodiment.Utilize this structure, the physical length that can reduce liquid feeding member 920 prevents the harmful effect to the meniscus in the fluid jetting head 91 simultaneously to strengthen the efficient of discharging bubble.
The image forming apparatus that hereinafter explanation is comprised the liquid injection apparatus of embodiments of the invention.In the example hereinafter, the liquid injection apparatus of embodiments of the invention is applied to the ink jet printer of injection as the ink of liquid, and can be applicable to facsimile machine, duplicator and the Multi Role Aircraft with fax and copy function.Yet, the liquid that this liquid injection apparatus can be applied to spray is not ink but DNA sample for example, resist, the fluid jetting head of pattern material or liquid injection apparatus perhaps can be applicable to comprise the such fluid jetting head or the image forming apparatus of liquid injection apparatus.
The image forming apparatus of the 22nd embodiment of the present invention hereinafter is described with reference to Figure 63 to 65.Figure 63 is the schematic diagram of this image forming apparatus.Figure 64 is the schematic diagram of the maintenance/recovery operation of this image forming apparatus of explanation.Figure 65 is the schematic diagram of explanation liquid feed path.
This image forming apparatus is to comprise that four record shower nozzles (9100K, 9100C, 9100M and 9100Y) promptly are used for the line printer of ejection head unit of the ink of four kinds of different colours (black, blue or green rate look, pinkish red and yellow).Each record shower nozzle 9100 has and the corresponding length of the width of maximum sized record-paper.Four record shower nozzles 9100 are fixed on the head cartridge 936, so that move up and down together by shower nozzle hoisting mechanism (not shown).
Recording sheet is directly writing down shower nozzle 9100K, 9100C, and 9100M and 9100Y below are transmitted and image are recorded on this recording sheet.Recording sheet is stacked in the feedboard 938, is presented one by one by sheet separation/feed mechanism (not shown), is transmitted by sheet material conveyer belt 930, is discharged into catch tray 939 after finishing record.
Sheet material conveyer belt 30 stretches between band transfer roller 931 and idler roller 932.Sheet material conveyer belt 930 has the double-decker that comprises the resistant layer of making as the high-drag layer of being made by resin material of positive layer with as the resin material of the carbon that is used for resistance control having of back layer.Sheet material conveyer belt 930 contacts with charging roller 933.Charging roller comprises the metal roll body, as the outer field middle resistant layer of metal roll body with as outermost thin high-drag layer.
When high voltage is applied to charging roller 933, discharge near the air gap the roll gap between sheet material conveyer belt 930 and the charging roller 933, so that electric charge is attached on the sheet material conveyer belt 930.If alternating current is applied on the charging roller 933, then sheet material conveyer belt 930 is by alternately positive and negative charging.When recording sheet was on the sheet material conveyer belt 930 of charging, recording sheet was because electrostatic interaction is attached to sheet material conveyer belt 930.Therefore, recording sheet firmly is attached to sheet material conveyer belt 630 when implementing printing.Therefore, print even also can obtain stable high-quality under the situation of when transmitting sheet material at a high speed, implementing to print.
Each record shower nozzle 9100 ( record shower nozzle 9100K, 9100C, 9100M and 9100Y) comprises a plurality of fluid jetting heads 91.Each fluid jetting head 91 is such as the described thermal type shower nozzle of second embodiment, and this shower nozzle utilizes heater element 94 to produce expulsion pressure by the film boiling of ink described in the 16 embodiment.Fluid jetting head 91 has the side emitter construction, wherein flows to the direction of spraying energy applying units (heater element portion) in each independent fluid chamber 6 ink inside and meets at right angles with the central axis of the opening of corresponding nozzle 95.
The advantage of this structure not only is to convert the energy efficient that heater element 94 produces to form ink droplet and advance ink droplet energy, and is by presenting the fast quick-recovery meniscus of ink.In addition, the side emitter construction prevents so-called cavitation, and this phenomenon produces in the edge emitter construction and damages heater element 94 gradually owing to the impact of bubble collapse.This be because in the side emitter construction bubble growth and arrive at nozzle 95 and is communicated with atmosphere, prevent that bubble is owing to temperature decline is shunk.Therefore, the record shower nozzle 91 of side emitter construction has longer service life.
Fluid jetting head 91 for example can utilize and be used to make the processing step manufacturing of writing down shower nozzle 1 in the 13rd embodiment of the present invention.
Utilize above-mentioned steps, short fluid jetting head 91 can manufacture has 600dpi/ row, and the nozzle row of 1200CH/ row (1200 nozzles 95 among expression one row) and 240 μ m at interval.
Liquid feeding member 920 used herein is liquid feeding members 920 of the ejection head unit of the 16 embodiment.Parts with path (main channel 921 and narrow communication passage 922) of the cross sectional shape shown in Figure 45 to 47 reach thereon by cutting clear polycarbonate resin, and gluing forms.As shown in figure 44, six fluid jetting heads 91 are attached on the liquid feeding member 920 forming ejection head unit 9100, and this ejection head unit can cover six times of print areas of being wider than the zone that the ejection head unit that only has a fluid jetting head 91 can cover.
This liquid feeding member 920 has feed port 912 and outlet 913 in the opposite end, and comprises two passages 921,921 as shown in figure 46.Each passage 921,921 comprises main channel 921 and the narrow communication passage 922 that is communicated with fluid jetting head 91.Narrow communication passage 922 limits the opening of the public fluid chamber 97 of leading to fluid jetting head 91 and has the width littler than main channel 921.
Each main channel 921 has than not towards the bigger width of the regional 921b of narrow communication passage 922 and the bigger degree of depth at the regional 921a towards narrow communication passage 922.With reference to Figure 45 to 47, specifically be of a size of Wg:5mm, Wf:2.4mm, Wh:3mm, Hg:6mm, Hf:4mm, Hh:4mm and Yh:2mm.
This liquid feeding member 920 is connected with ink feed system in the liquid feed path shown in Figure 65.In this liquid feed path (liquid feeder system), shower nozzle groove 970 is set to have to ejection head unit 9100 and presents ink and receive bubble and it is discharged to outside function.Shower nozzle groove 970 comprises that first inking chamber 971 and top have second inking chamber 972 of atmosphere opening 973.Pump P2 can send ink to first inking chamber 971 from second inking chamber 972.Ink cartridge 976 is connected with second inking chamber 972, makes the ink that has filtered by filter 975 can be provided to second inking chamber 972 of shower nozzle groove 970 by pump P1.
Bottom at second inking chamber 972 of shower nozzle groove 970 is the ink port that is connected with the outlet 913 of the liquid feeding member 920 of ejection head unit 9100 by normally open valve V2.The volume of the ink in second inking chamber 972 makes the difference in height Sh between ink level and the shower nozzle 91 remain definite value (10-150mm) by liquid level sensor 974 controls.
Form operating period at common image, pump P1 and P2 stop, and only valve V2 opens.Ink is provided to ejection head unit 9100 by outlet 913 from second inking chamber 972.Ink level in second inking chamber 972 is owing to the use of ink drops under the precalculated position, and this descends and is detected by liquid level sensor 974.In response, valve V1 opens, and pump P1 is actuated to provide ink from ink cartridge 976 to second inking chamber 972.This provides the detection signal according to liquid level sensor 974 to stop.
Under the situation that the fluid jetting head 91 of ejection head unit 9100 gets clogged, implement the recovery operation of fluid jetting head 91.Ejection head unit 9100 moves from the position shown in Figure 63, and maintenance unit 935 moves horizontally (right side from the position shown in Figure 63 to Figure 63) to the position that is located immediately at fluid jetting head 91 belows.Fluid jetting head 91 moves down slightly then, and the nozzle face 95a of the nozzle 95 of fluid jetting head 91 is closely contacted with the cap 940 that maintaining part 943 by maintenance unit 935 keeps.Then, valve V1 and V2 (Figure 65) close, and only pump P2 is actuated the preset time cycle.
Therefore, the ink in first inking chamber 971 is pressurized to flow into ejection head unit 9100.Because valve V2 closes, ink is discharged from the nozzle 95 of fluid jetting head 91.With ink, the impurity of bubble and block liquid shower nozzle 91 is removed.After pump P2 stopped, ejection head unit 9100 moved up to disengage with cap 940.Then, maintenance unit 935 moves horizontally (from the right side of the position shown in Figure 66 to Figure 66) to utilize the nozzle face 95a of the scraping blade 941 wiping fluid jetting heads 91 shown in Figure 67.After forming meniscus because of wiping in nozzle 95, valve V2 opens so that each fluid jetting head 91 remains under negative pressure has difference in height Sh.
Cap 940, collect and aspirate to enter waste liquid cabinet 944 from the ink that fluid jetting head 91 is discharged by pump 945.In alternate embodiment, the ink in the cap 940 can utilize filter to filter but be not transported to waste liquid cabinet 944 but second inking chamber 972 that returns shower nozzle groove 970 to utilize again.
Then, ejection head unit 9100 and maintenance unit 935 are vertical respectively and move horizontally, and return the position shown in Figure 63 to write down operation.Perhaps, ejection head unit 9100 and maintenance unit 935 can be parked in the position shown in Figure 64 and wait for recording instruction.It is in good condition with the fluid jetting head 91 that keeps ejection head unit 9100 that this recovery operation removes deoppilation.
In the liquid feeder system shown in Figure 65, the runner 980 and 981 that connects shower nozzle groove 970 and liquid feeding member 920 is generally pitch tube, and bubble enters inside because of the gas permeability of tubing in the past along with the time.If a large amount of bubbles are accumulated in liquid feeding member 920 inside, then bubble by the mobile fluid jetting head 91 of bringing into of ink, causes the ink droplet jet fault in the record operating process.With reference to Figure 65, in order to remove bubble from liquid feeding member 920, valve V2 opens, and only pump P2 is actuated to present ink from second inking chamber 972 to first inking chamber 971.Then, ink is discharged from outlet 913 with bubble, and is back to second inking chamber 972 from the feed port 912 of first inking chamber, 971 influent feeding members 920.In second inking chamber 972, the bubble in the ink rises to discharge from atmosphere opening 973.
Performance for the discharge bubble of the liquid feeding member 920 of evaluate image forming device, bubble is introduced pipeline by the triple valve of liquid feeding member 920 upstream sides, introduce liquid feeding member 920 by pump P2 then, observe the inside of liquid feeding member 920 simultaneously.Pump P2 stops waiting for mobile the stopping of liquid feeding member 920 inside.Then, pump P2 restarts and makes ink circulation with 60ml/ minute flow rate.As a result, though the corner stops a small amount of bubble on liquid feeding member 920, most of bubble can be discharged from.In addition, do not observe such as the fault of ink from nozzle 95 seepages on the nozzle face of each fluid jetting head 91 of ejection head unit 9100, image forms can not have under the situation of ejection failure perfection carry out.
As a comparative example, the liquid feeding member that is produced comprises respectively having uniform sectional area and Wg:5mm, Wf:2.4mm, Wh:5mm, Hg:6mm, Hf:4mm, the main channel 921 of the size of Hh:6mm and Yh:2mm.Then, the ejection head unit that comprises this liquid feeding member prepare in the same manner as described above and the bubble discharging performance evaluated.The result, though bubble can be discharged from, but compare the cost more time with above-mentioned liquid feeding member 920 with main channel 921 and discharge bubble, described each main channel 921 does not have the bigger width and the degree of depth towards the regional 921b of narrow communication passage 922 at the regional 921a ratio towards narrow communication passage 922.
Next, for this image forming apparatus prepares liquid feeding member 920, wherein, as comparative example 6 (Figure 50), feed port 912 is arranged on the top of fluid jetting head 91, and outlet 913,913 is arranged on longitudinal relative end.The bubble discharging performance is evaluated then.As a result, discharge the required time decreased of bubble, the efficient of discharging bubble improves.Yet, be connected to the liquid level height in the shower nozzle groove 970 of liquid feeding member 920, make ink at the nozzle face 95a of ejection head unit 9100 with overflowed meniscus in the difference in height Sh between the liquid level hour.
Then, the liquid feeding member 920 (Figure 49) shown in the 17 embodiment is produced, and wherein guide of flow member 918 is arranged in each main channel 921 position towards feed port 912.Guide of flow member 918 have curved upper surface with on different directions smoothly with the ink stream that provided towards two outlets 913,913 are divided into two strands of liquid stream, and following (end) surface 919 with inclination stops thereon from the bubble that fluid jetting head 91 moves up preventing.Utilize the bubble discharging performance of this liquid feeding member 920 to assess in the same manner as described above.As a result, different with above-mentioned experiment, can discharge bubble and not have ink to overflow meniscus with the less time.
Next, be the feeding member 920 of this image forming apparatus preparation as shown in liquid feeding member 920 relatively, wherein, as comparative example 6 (Figure 50), feed port 912 is arranged on the top of fluid jetting head 91, and outlet 913,913 is arranged on vertical end.The bubble discharging performance is evaluated then.Liquid feeding member 920 has the structure that is suitable for flying print, wherein the narrow communication passage 922 that is communicated with fluid jetting head 91 forms to main channel 921 and gives prominence to, so main channel 921 has the height ratio of open space with respect to the external dimensions of liquid feeding member 920.With reference to Figure 58 to 60, concrete size is Wa:8mm, Wf:1.6mm, Ha:6mm, Hi:2mm and Yh:1.5mm.
The liquid feeding member 920 of comparative example 7 be connected with the ink feed system shown in Figure 65 and the bubble discharging performance evaluated.Found that in order normally to discharge bubbles from liquid feeding member 920, ink need be with 200ml/ minute or higher flow rate circulation.Yet when ink circulation time under such condition, ejection failure takes place in follow-up ink spraying.
Then, preparation ejection head unit 9100, this unit comprises the liquid feeding member 920 (Figure 55 to 57) shown in the 20 embodiment, wherein, have the height higher than narrow communication passage 922 fin 916 (916a, 916b) be arranged on narrow communication passage 922 opening around.As fin 916, each thickness be three fin 916a of 0.4mm be arranged on each narrow communication passage 922 with the spacing of 0.9mm each vertically on the end, thickness is that the fin 916b of 0.6mm is arranged on each cross side of narrow communication passage 922.Fin 916a and 916b are than the high 2mm of opening (Hr:4mm) of narrow communication passage 922.The bubble discharging performance that comprises the ejection head unit 9100 of this liquid feeding member 920 is assessed in the same manner as described above.As a result, even with 200ml/ minute or bigger flow rate circulation ink the time, also can normally discharge bubble and not have the ink ejection failure.
Next, in order to obtain to discharge efficient than the higher bubble that the 20 embodiment is obtained, ejection head unit 9100 is produced, this ejection head unit 9100 comprises the liquid feeding member 920 (Figure 61 and 62) as the 21 embodiment, this liquid feeding member 920 has four additional port on its top board 921d, i.e. two additional feed port 912 and two additional outlets 913.The feed port 912 and the outlet 913 that are arranged on the top board 921d are positioned at the not position above the open communication of leading to fluid jetting head 91 (narrow communication passage 922).Feed port 912 and outlet 913 are arranged alternately.
Because the distance between adjacent mouthful is owing to the setting of a plurality of opennings reduces, therefore can discharge bubble with situation less time than the liquid feeding member 920 that uses the 20 embodiment.And the setting of a plurality of opennings can realize the liquid circulation in the specific region.When print image on the small size sheet material, not that all short fluid jetting heads 91 (91a-91f) of long ejection head unit 9100 are driven.For example, only three of the right side in Figure 55 and 56 shower nozzles (91a, 91d and 91e) are actuated to print image.In this case, there is not the shower nozzle (1b, 1c and 1f) of use not need the bubble discharging operation.That is, can discharge bubble by only utilizing near the openning circulation ink of shower nozzle (1b, 1c and 1f) that is used.
As the ink circulation that can realize in the specific region that is provided with of a plurality of opennings, can discharge bubble effectively and do not waste electric energy.That is, being provided with of a plurality of opennings can utilize required in the various combinations of these an opennings combination to realize ink circulation according to situation, thereby improves the stability of the long ejection head unit 9100 that comprises this liquid feeding member 920 and the stability of image recorder.
The image forming apparatus of the 23rd embodiment of the present invention hereinafter is described with reference to Figure 68.
The liquid feed path of this image forming apparatus (ink feed system) is arranged on the downstream of the outlet 913,913 of liquid feeding member 920 with the different flow control valve V3 that are of the ink feed system of Figure 65.In this embodiment, feed port 912 is arranged on the part of non-vertical end, and outlet 913,913 is arranged on longitudinal relative end.
Being provided with of the flow regulator V3 in outlet 913 downstreams allows the flow rate (Qc) of adjusting from the ink of outlet 913 discharges.This ink can 921 be pressed into shower nozzle 91 from the main channel by reducing flow rate Qc.Therefore, can be simultaneously from the main channel 921 and fluid jetting head 91 discharge bubbles.
As mentioned above, in an embodiment of the present invention, circular flow can not produce harmful effect to the meniscus of nozzle.Therefore, can operating period have circular flow at record.Since can be when writing down operation the circulation ink, can prevent that therefore bubble from accumulating.That is, needn't end the record and remove to carry out the bubble discharging operation, the result has increased record quantity.
Though the present invention is applicable to the fluid jetting head of various types, because the temperature of thermal type shower nozzle rises easily with the temperature of ink, so the present invention is particularly useful for the thermal type shower nozzle described in the previous embodiment.In the thermal type shower nozzle, because the bubble that bubble might produce in shower nozzle and be produced may move into public fluid chamber, so the present invention is particularly useful for above-mentioned side injector head.
2007-033986 number and the application of 2007-034252 Japanese priority that the application submitted to Japan Patent office based on February 14th, 2007 and on February 15th, 2007, the full content of this priority application is incorporated by reference herein.

Claims (15)

1. the liquid injection apparatus from the fluid jetting head liquid droplets is characterized in that, described liquid injection apparatus comprises:
Liquid feeding member to described fluid jetting head feed liquid, described liquid feeding member is connected with fluid jetting head with the public fluid chamber feed liquid to described fluid jetting head, described fluid jetting head comprises the described public fluid chamber that liquid is provided to a plurality of independent fluid chamber that are communicated with the nozzle of a plurality of liquid droplets, and described liquid feeding member comprises:
The liquid circulating passage footpath that the liquid edge direction circulation time parallel with the direction of the nozzle arrangement of described fluid jetting head passes through;
Wherein, the outlet that passes through when described liquid circulating passage is directly discharged of the feed port passed through when described liquid circulating passage directly provides of described liquid and described liquid is set at the longitudinal relative end in described liquid circulating passage footpath;
The open communication that is communicated with described public fluid chamber is set at the described public fluid chamber side in the described liquid circulating passage footpath; And
Described open communication has the little width of width than described liquid circulating passage footpath.
2. liquid injection apparatus as claimed in claim 1 is characterized in that, wherein, described open communication has the degree of depth darker than the remainder of described open communication being arranged on described part of presenting oral-lateral or described discharge oral-lateral at least.
3. liquid injection apparatus as claimed in claim 1 is characterized in that, wherein, the top in described liquid circulating passage footpath is perpendicular to having the convex curve surface shape that is bent upwards from described feed port to the cross section of the direction of the liquid flow of described outlet.
4. liquid injection apparatus as claimed in claim 1 is characterized in that, wherein, the parts that flow without any barrier liquid are set between the upper shed and described liquid circulating passage top board directly of described public fluid chamber.
5. liquid injection apparatus as claimed in claim 1 is characterized in that, wherein, the part that limits the open communication that is arranged on the described public fluid chamber side in the described liquid circulating passage footpath is made by high conductivity material.
6. the liquid injection apparatus from the fluid jetting head liquid droplets is characterized in that, described liquid injection apparatus comprises:
Liquid feeding member to described fluid jetting head feed liquid, described liquid feeding member is connected with described fluid jetting head with the public fluid chamber feed liquid to described fluid jetting head, described fluid jetting head comprises the described public fluid chamber that liquid is provided to a plurality of independent fluid chamber that are communicated with the nozzle of a plurality of liquid droplets, and described liquid feeding member comprises:
The liquid circulating passage footpath that the liquid edge direction circulation time parallel with the direction of the nozzle arrangement of described fluid jetting head passes through;
Wherein, the outlet that passes through when described liquid circulating passage is directly discharged of the feed port passed through when described liquid circulating passage directly provides of described liquid and described liquid is set at the longitudinal relative end in described liquid circulating passage footpath;
The open communication that is communicated with described public fluid chamber is set at the described public fluid chamber side in the described liquid circulating passage footpath; And
A plurality of fins be arranged on described open communication around;
Described a plurality of fin is set to be parallel to the longitudinal direction in described liquid circulating passage footpath or prolongs direction setting perpendicular to the longitudinal direction in described liquid circulating passage footpath.
7. liquid injection apparatus as claimed in claim 6, it is characterized in that, wherein, each described fin described in being arranged on described liquid circulating passage footpath presented the part of oral-lateral and the part of described discharge oral-lateral has the height higher than the remainder of described fin.
8. liquid injection apparatus as claimed in claim 6 is characterized in that wherein said fin is made by high conductivity material.
9. the liquid injection apparatus from a plurality of fluid jetting head liquid droplets is characterized in that, described liquid injection apparatus comprises:
Described a plurality of fluid jetting head is along the longitudinal direction elongation of liquid jet structure spare, also along arranging perpendicular to the mutual vertical misalignment of the direction of described longitudinal direction;
The liquid feeding member is connected with described a plurality of fluid jetting heads with the public fluid chamber feed liquid to described fluid jetting head, each fluid jetting head comprises the public fluid chamber that liquid is provided to a plurality of independent fluid chamber that is communicated with the nozzle of a plurality of liquid droplets, and described liquid feeding member comprises:
The fluid passage that the described liquid edge direction parallel with the direction of the nozzle arrangement of each fluid jetting head passed through;
Wherein, the outlet that passes through when described fluid passage is discharged of the feed port passed through when described fluid passage provides of described liquid and described liquid is set at the described fluid passage; And
Described fluid passage has than its bigger sectional area of part between adjacent public fluid chamber in the part that is connected to described fluid jetting head, and described feed port and described outlet are arranged on the longitudinal relative end of described fluid passage.
10. liquid injection apparatus as claimed in claim 9 is characterized in that, wherein
In described feed port and the described outlet at least one is set at the vertically part of end of on-liquid passage; And
The flow guide member that guiding liquids flows is set between the described feed port and/or described outlet that is provided with on the part of described public fluid chamber and the vertical end of on-liquid passage.
11. liquid injection apparatus as claimed in claim 9, it is characterized in that, in wherein said feed port and the described outlet at least one is not set at vertical end of described fluid passage, but is set at towards the position of the part of described fluid passage between adjacent public fluid chamber.
12. liquid injection apparatus as claimed in claim 9 is characterized in that, fin be arranged on each open communication of being connected with described public fluid chamber in the described fluid passage around.
13. liquid injection apparatus as claimed in claim 12 is characterized in that, wherein, at least one in described feed port and the described outlet is set at the vertically part of end of on-liquid passage; And
The flow guide member that guiding liquids flows is set between the described feed port and/or described outlet that is provided with on the part of public fluid chamber and the vertical end of on-liquid passage.
14. liquid injection apparatus as claimed in claim 12, it is characterized in that, wherein, at least one in described feed port and the described outlet is not set at vertical end of fluid passage, but is set at towards the position of the part of described fluid passage between adjacent public fluid chamber; And
Fin be arranged on each open communication of being connected with public fluid chamber in the fluid passage around.
15. an image forming apparatus that passes through to form from the fluid jetting head liquid droplets image is characterized in that described image forming apparatus comprises:
As each described liquid injection apparatus in the claim 1,6 and 9.
CN2008800001543A 2007-02-14 2008-02-04 Liquid ejection device, and image forming apparatus Active CN101541541B (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP033986/2007 2007-02-14
JP2007033986A JP4755119B2 (en) 2007-02-14 2007-02-14 Liquid supply member for liquid discharge head, liquid discharge apparatus, and image forming apparatus
JP034252/2007 2007-02-15
JP2007034252A JP4755120B2 (en) 2007-02-15 2007-02-15 Liquid supply member for liquid discharge head, head unit, liquid discharge apparatus, and image forming apparatus
PCT/JP2008/052205 WO2008099790A1 (en) 2007-02-14 2008-02-04 Liquid feeding member for liquid ejection head, liquid ejection device, and image forming apparatus

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