JPH06135003A - On demand type printer - Google Patents
On demand type printerInfo
- Publication number
- JPH06135003A JPH06135003A JP30786992A JP30786992A JPH06135003A JP H06135003 A JPH06135003 A JP H06135003A JP 30786992 A JP30786992 A JP 30786992A JP 30786992 A JP30786992 A JP 30786992A JP H06135003 A JPH06135003 A JP H06135003A
- Authority
- JP
- Japan
- Prior art keywords
- paint
- nozzle
- discharge nozzle
- control valve
- discharge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003973 paint Substances 0.000 claims abstract description 54
- 239000007788 liquid Substances 0.000 claims abstract description 21
- 238000001816 cooling Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 230000008602 contraction Effects 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 2
- 238000007711 solidification Methods 0.000 abstract description 4
- 230000008023 solidification Effects 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 230000005499 meniscus Effects 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000012459 cleaning agent Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
Landscapes
- Ink Jet (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
- Nozzles (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、オンデマンド型印字装
置、特に鉄鋼材料等の大型物品に大きなドット状印字を
するためのオンデマンド型印字装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-demand type printing apparatus, and more particularly to an on-demand type printing apparatus for printing large dots on large articles such as steel materials.
【０００２】[0002]
【従来の技術】従来のこの種の印字装置は、その先端に
ドット状印字に適した吐出ノズルを有し、この吐出ノズ
ルの内方に弁座と球形弁体からなる吐出制御弁が形成さ
れる。この球形弁体はロッドを介して振動機構の、例え
ば電磁ソレノイドの可動鉄心に一体的に連結される。弁
座と球形弁体の周辺には加圧された塗料が充満する室が
ある。可動鉄心の往復運動により吐出制御弁が開閉して
吐出ノズルよりドット状液体塗料が断続的に吐出され
る。制御弁が閉じた状態において、塗料は吐出ノズル内
に残留し、ノズル先端において塗料は界面張力によって
凸状のメニスカスを形成する。鋼鉄材料等に使用する塗
料は乾燥時間が30秒間以内と速乾性を要求されるので、
制御弁が相当時間（例えば 0.5分間）閉じたままになっ
ていると、このメニスカス部分の塗料が乾燥してノズル
に固着する。すると、これは次に吐出れる塗料の障害と
なり、塗料を真直ぐに吐出することができなくなる。2. Description of the Related Art A conventional printing apparatus of this type has a discharge nozzle suitable for dot-shaped printing at its tip, and a discharge control valve consisting of a valve seat and a spherical valve body is formed inside the discharge nozzle. It The spherical valve element is integrally connected to a movable iron core of a vibration mechanism, for example, an electromagnetic solenoid, via a rod. Around the valve seat and the spherical valve there is a chamber filled with pressurized paint. The reciprocating motion of the movable iron core opens and closes the discharge control valve to intermittently discharge the dot-shaped liquid paint from the discharge nozzle. When the control valve is closed, the paint remains in the discharge nozzle, and the paint forms a convex meniscus at the nozzle tip due to the interfacial tension. The paint used for steel materials, etc. requires a quick drying time of 30 seconds or less,
If the control valve remains closed for a considerable amount of time (eg 0.5 minutes), the paint on this meniscus will dry and stick to the nozzle. Then, this becomes an obstacle to the next paint to be discharged, and the paint cannot be discharged straight.
【０００３】かかるノズル先端付近における塗料凝固を
防止するために、従来は、ノズル先端付近の塗料を洗浄
剤または溶媒によって洗浄して除去したり、溶媒のミス
トを生成して塗料と空気との接触を遮断することが行わ
れていた。In order to prevent the coating material from coagulating near the nozzle tip, conventionally, the coating material near the nozzle tip is cleaned and removed with a cleaning agent or solvent, or a mist of the solvent is generated to bring the coating material into contact with air. Was being cut off.
【０００４】しかしながら、上記のような解決策は、構
造上複雑で大型となり、特に印字ヘッドを可動にする場
合等には不適当である。洗浄剤または溶媒等の循環装置
のような付属装置の設置及び保守等に要する費用、労力
等も無視することはできない。However, the above solution is complicated and large in structure, and is not suitable especially when the print head is movable. The cost and labor required for the installation and maintenance of auxiliary equipment such as circulation equipment for cleaning agents or solvents cannot be ignored.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、上記のよう
な欠点が改善され、極めて簡潔な構成でありながら、ノ
ズル先端における塗料の凝固、並びにそれによる障害を
防止することができる印字装置を提供することを目的と
する。SUMMARY OF THE INVENTION The present invention provides a printing apparatus which is capable of preventing the above-mentioned drawbacks and of preventing the solidification of the coating material at the nozzle tip and the troubles caused by the coating material with a very simple structure. The purpose is to provide.
【０００６】[0006]
【課題を解決するための手段】本発明者は、温度変化に
よる塗料の膨脹収縮を利用して、上記目的を達成した。The present inventor has achieved the above-mentioned object by utilizing the expansion and contraction of the coating material due to the temperature change.
【０００７】すなわち本発明は、ドット状液体塗料を吐
出するための吐出ノズルと、この吐出ノズルの流路に設
けられた弁座および弁体からなる吐出制御弁と、この吐
出制御弁を開閉させてドット状液体塗料を吐出するため
の機構を有するオンデマンド型印字装置において、上記
制御弁を閉じた後に吐出ノズル内に残留した液体塗料の
体積収縮を行う手段を備え、それによって、吐出ノズル
先端における液体塗料界面が後退することを特徴とする
オンデマンド型印字装置である。That is, according to the present invention, a discharge nozzle for discharging the dot-shaped liquid paint, a discharge control valve including a valve seat and a valve body provided in the flow path of the discharge nozzle, and the discharge control valve opened and closed. An on-demand type printer having a mechanism for ejecting dot-shaped liquid coating material is provided with means for performing volumetric contraction of the liquid coating material remaining in the ejection nozzle after closing the control valve, and thereby the ejection nozzle tip. The on-demand type printing apparatus is characterized in that the interface of the liquid paint in (1) is set back.
【０００８】ノズル内に残留した液体塗料の体積収縮を
行う手段としては、(1) 吐出ノズルを冷却する機構、
(2) 制御弁より後方（吐出ノズルと反対側）において吐
出前の液体塗料を加熱する機構、または (3)上記の (1)
と(2) の組み合わせが挙げられる。Means for shrinking the volume of the liquid paint remaining in the nozzle include (1) a mechanism for cooling the discharge nozzle,
(2) A mechanism that heats the liquid paint before the discharge, behind the control valve (on the side opposite to the discharge nozzle), or (3) above (1)
And the combination of (2).
【０００９】紙への印字を行うオフィス用の印字装置と
違って、特に鋼管などへの印字を行うオンデマンド型印
字装置においては、吐出ノズルの内容積が比較的大きい
（好ましくは１mm3 以上）ので、本発明の効果が特に顕
著に奏される。Unlike the office printer for printing on paper, the internal volume of the discharge nozzle is relatively large (preferably 1 mm 3 or more) particularly in the on-demand printer for printing on steel pipes. Therefore, the effect of the present invention is particularly remarkable.
【００１０】以下、本発明を図面に示す実施態様により
詳細に説明する。The present invention will be described in detail below with reference to the embodiments shown in the drawings.
【００１１】図１は、印字装置の吐出ノズル付近の部分
断面図である。この印字装置は、本体１の先端に固定さ
れたヘッド２を有し、このヘッド２の孔の底部には弁座
３が装着され、この弁座３に隣接して吐出ノズル４を有
するノズルホルダ５が装着され、次いで本発明により吐
出ノズル４の回りに環状の冷却空気通路６を形成する同
心の孔を有する冷却空気ガイド７がヘッド２にねじこま
れている。吐出ノズル４の先端が冷却空気通路６の出口
６' より、たとえば１〜５mmだけ突出していることが好
ましい。冷却空気通路６は、冷却空気ガイド７の半径方
向孔８、ヘッド２の半径方向孔９を介して冷却空気接続
口10に接続されている。一方、弁座３には、球形弁体11
がロッド12を介して振動機構の、例えば電磁ソレノイド
の可動鉄心13に一体に連結され、この可動鉄心13には固
定鉄心15が隣接し、これらの鉄心の回りにはソレノイド
コイル16が配置されている。弁座３、球形弁体11の周辺
の室14には、加圧された塗料が塗料接続口15より圧送さ
れて来て加圧下で充満している。FIG. 1 is a partial sectional view of the vicinity of a discharge nozzle of a printing apparatus. This printing apparatus has a head 2 fixed to the tip of a main body 1, a valve seat 3 is attached to the bottom of the hole of the head 2, and a nozzle holder having a discharge nozzle 4 adjacent to the valve seat 3. 5, a cooling air guide 7 is screwed into the head 2 with concentric holes forming an annular cooling air passage 6 around the discharge nozzle 4 according to the invention. It is preferable that the tip of the discharge nozzle 4 projects from the outlet 6'of the cooling air passage 6 by, for example, 1 to 5 mm. The cooling air passage 6 is connected to the cooling air connection port 10 via a radial hole 8 of the cooling air guide 7 and a radial hole 9 of the head 2. On the other hand, the valve seat 3 has a spherical valve body 11
Of the vibration mechanism, for example, is integrally connected to a movable iron core 13 of an electromagnetic solenoid via a rod 12, a fixed iron core 15 is adjacent to the movable iron core 13, and a solenoid coil 16 is arranged around these iron cores. There is. The chamber 14 around the valve seat 3 and the spherical valve body 11 is filled with pressurized paint by being sent under pressure from the paint connection port 15.
【００１２】振動機構のソレノイドコイルに通電してい
ない状態では、球形弁体11は、スプリングによって弁座
３に押圧されている。通電すると、可動鉄心13が吐出ノ
ズル４と反対方向に吸引されて球形弁体11が弁座３から
離れて開弁し、加圧された塗料がドット状液体微粒子と
なって吐出ノズルより吐出される。ソレノイドコイルへ
の電流を切ると弁が閉じられ、図２の(a) に示すように
ノズル４内に塗料21が残留し、ノズル先端では塗料が凸
状のメニスカス22を形成する。When the solenoid coil of the vibration mechanism is not energized, the spherical valve element 11 is pressed against the valve seat 3 by the spring. When energized, the movable iron core 13 is attracted in the direction opposite to the discharge nozzle 4, the spherical valve element 11 separates from the valve seat 3 and opens the valve, and the pressurized paint becomes dot-shaped liquid fine particles and is discharged from the discharge nozzle. It When the current to the solenoid coil is cut off, the valve is closed, the paint 21 remains in the nozzle 4 as shown in FIG. 2 (a), and the paint forms a convex meniscus 22 at the tip of the nozzle.
【００１３】弁が相当時間閉じられる場合には、本発明
に従い冷却空気を吐出ノズル４の周囲に流して、残留塗
料21を冷却する（あるいは、冷却空気を常時流しても良
い）。すると残留塗料21が収縮して、図２の(b) に示す
ように吐出ノズル先端における塗料界面が後退する。こ
の状態においては、塗料の界面での乾燥固化が遅い。仮
に乾燥固化が生じたとしても、次に弁が開けられて吐出
圧力がかかると塗料皮膜は容易に液体塗料と共に吐出さ
れ、ノズル先端には異物（固着した塗料）がないので、
塗料の吐出方向が曲げられたりすることがない。When the valve is closed for a considerable time, cooling air is flown around the discharge nozzle 4 according to the invention to cool the residual paint 21 (or cooling air may be flowed at all times). Then, the residual paint 21 contracts, and the paint interface at the tip of the discharge nozzle recedes as shown in FIG. In this state, the drying and solidification at the interface of the paint is slow. Even if dry solidification occurs, the paint film is easily discharged together with the liquid paint when the valve is opened next and the discharge pressure is applied, and there is no foreign matter (fixed paint) at the nozzle tip.
The paint discharge direction will not be bent.
【００１４】本発明において吐出ノズルは、内容積
（Ｖ）が大きく、先端部の断面積（Ｓ）が小さいほど、
塗料がノズル内に引き込まれる効果が大きいので好まし
い。従って、図３に示すように、ノズルの先端のみを所
定のノズル口径ｌ1 とし、ノズル先端から距離ｌ3 以後
では、より大きい内径ｌ2 とし、そして、この内径ｌ2
を有しかつ冷却される部分の長さｌ4 を可及的長くする
ことが好ましい。In the present invention, the discharge nozzle has a larger internal volume (V) and a smaller cross-sectional area (S) at the tip,
It is preferable because the paint has a great effect of being drawn into the nozzle. Therefore, as shown in FIG. 3, only the tip of the nozzle has a predetermined nozzle diameter l 1, and after the distance l 3 from the nozzle tip, has a larger inner diameter l 2 , and this inner diameter l 2
It is preferable to make the length l 4 of the portion having the above-mentioned temperature and cooled as long as possible.
【００１５】一例として、ｌ1 ＝0.15mm、ｌ2 ＝ 0.3m
m、ｌ3 ＝５mm、ｌ4 ＝50mmの吐出ノズルにおいて、塗
料を成す液体としてエタノール（20℃での体積膨脹率β
t ＝1.08×10-3）を用いた塗料がノズル内で10℃冷却さ
れる場合を例にとり、液面が温度変化によって引き込ま
れる長さを計算する。 βt ×Ｖ×10／Ｓ＝（1.08×10-3）×{5×π×(0.15/2)
2 ＋50×π×（0.3/2)2｝×10／｛π×(0.15/2)2 ｝＝
2.21 すなわち、塗料はノズル先端から約 2.2mm引き込まれる
計算となる。実際にテストすると、塗料がノズル中に引
き込まれる長さは 0.5〜１mm程度であった。この理論値
との乖離は、弁座と弁体との間のシールが完全ではない
こと及び当初存在したメニスカス部分の故であると考え
られる。いずれにせよ、テストにおける 0.5〜１mmの後
退は、本発明の効果を得るために十分であった。上記で
は10℃冷却される例を述べたが、一般に５〜20℃の温度
差で十分である。As an example, l 1 = 0.15 mm, l 2 = 0.3 m
In a discharge nozzle of m, l 3 = 5 mm, l 4 = 50 mm, ethanol (volume expansion coefficient at 20 ° C.
Take the case where the paint using t = 1.08 × 10 -3 ) is cooled in the nozzle by 10 ° C, and calculate the length that the liquid surface is pulled in due to the temperature change. β t × V × 10 / S = (1.08 × 10 −3 ) × {5 × π × (0.15 / 2)
2 + 50 x π x (0.3 / 2) 2 } x 10 / {π x (0.15 / 2) 2 } =
2.21 That is, the paint is calculated to be drawn about 2.2 mm from the nozzle tip. In actual tests, the length of the paint drawn into the nozzle was about 0.5 to 1 mm. It is considered that the deviation from the theoretical value is due to the incomplete seal between the valve seat and the valve body and the initially existing meniscus portion. In any case, a recession of 0.5 to 1 mm in the test was sufficient to obtain the effect of the present invention. Although an example of cooling by 10 ° C has been described above, a temperature difference of 5 to 20 ° C is generally sufficient.
【００１６】吐出ノズル内に残留した液体塗料の体積収
縮を行う手段の別の態様は、制御弁より後方（吐出ノズ
ルと反対側）において吐出前の液体塗料を加熱する機構
である。これは、図１において、ソレノイドコイル16
に、可動鉄心13を動かさない程度の電流を流す機構によ
り、可動鉄心13の温度を上げることにより行い得る。可
動鉄心13は、塗料の室14に続いているので、ここで塗料
が温められる。上述したように、弁が閉じてから塗料の
温度が下がる温度差は５〜20℃で十分であるから、この
態様において室14中の塗料は室温より５〜20℃高ければ
十分である。あるいは、塗料タンク（図示せず）と接続
口15の間に慣用の熱交換手段、例えばホットホースを備
えて塗料を加熱することができる。この場合、室14にお
いて塗料の温度が下がることを考慮に入れて、室14内の
塗料温度が室温より例えば５〜20℃高くなるように塗料
を十分加熱する。室14を断熱材で保温することが好まし
い。Another mode of the means for performing volumetric contraction of the liquid paint remaining in the discharge nozzle is a mechanism for heating the liquid paint before the discharge, behind the control valve (on the side opposite to the discharge nozzle). This is the solenoid coil 16 in FIG.
In addition, it can be performed by raising the temperature of the movable iron core 13 by a mechanism for supplying a current that does not move the movable iron core 13. Since the movable iron core 13 continues to the paint chamber 14, the paint is warmed here. As mentioned above, a temperature difference of 5 to 20 ° C. in which the temperature of the paint decreases after the valve is closed is sufficient. Therefore, in this embodiment, the temperature of the paint in the chamber 14 is 5 to 20 ° C. higher than room temperature. Alternatively, a conventional heat exchange means such as a hot hose may be provided between the paint tank (not shown) and the connection port 15 to heat the paint. In this case, taking into consideration that the temperature of the paint in the chamber 14 is lowered, the paint is sufficiently heated so that the temperature of the paint in the chamber 14 is higher than room temperature by, for example, 5 to 20 ° C. It is preferable to keep the chamber 14 warm with a heat insulating material.
【００１７】あるいは、上記した二つの態様、すなわち
(1)吐出ノズルの冷却及び (2)塗料の加熱を組み合わせ
ることができる。それによって、冷却及び加熱の夫々の
負荷を軽減し、所定の温度を容易に実現できる。Alternatively, the above two modes, that is,
It is possible to combine (1) cooling of the discharge nozzle and (2) heating of the paint. Thereby, the respective loads of cooling and heating can be reduced, and the predetermined temperature can be easily realized.
【００１８】本発明に従うオンデマンド型印字装置を複
数配置して、マトリックス印字を行う装置とすることが
できる。A plurality of on-demand type printing devices according to the present invention may be arranged to form a matrix printing device.
【００１９】[0019]
【発明の効果】本発明に従う印字装置においては、ノズ
ル先端において塗料が乾燥固化することがない。従っ
て、塗料が真直ぐ吐出され、印字を迅速確実に行うこと
ができる。In the printing apparatus according to the present invention, the paint does not dry and solidify at the nozzle tip. Therefore, the paint is discharged straight, and printing can be performed quickly and reliably.
【図１】本発明に従うオンデマンド型印字装置の一例の
断面図。FIG. 1 is a sectional view of an example of an on-demand type printer according to the present invention.
【図２】ノズル先端部における塗料の状態を示す断面
図。FIG. 2 is a cross-sectional view showing a state of paint at a nozzle tip portion.
【図３】本発明の印字装置において使用し得る、好まし
いノズルの一例の断面図。FIG. 3 is a sectional view of an example of a preferable nozzle that can be used in the printing apparatus of the present invention.
４ 吐出ノズル ３ 弁座 ６ 冷却空気通路 ７ 冷却空気ガイド 11 球形弁体 13 可動鉄心 14 室（加圧された塗料が充満している） 16 ソレノイドコイル 21 塗料 22 凸状のメニスカス 4 Discharge nozzle 3 Valve seat 6 Cooling air passage 7 Cooling air guide 11 Spherical valve body 13 Movable core 14 Chamber (filled with pressurized paint) 16 Solenoid coil 21 Paint 22 Convex meniscus
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ４１Ｊ 2/055 9012−2Ｃ Ｂ４１Ｊ 3/04 １０３ Ａ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI technical display location B41J 2/055 9012-2C B41J 3/04 103 A
Claims (4)
ノズルと、この吐出ノズルの流路に設けられた弁座およ
び弁体からなる吐出制御弁と、この吐出制御弁を開閉さ
せてドット状液体塗料を吐出するための機構を有するオ
ンデマンド型印字装置において、上記制御弁を閉じた後
に吐出ノズル内に残留した液体塗料の体積収縮を行う手
段を備え、それによって、吐出ノズル先端における液体
塗料界面が後退することを特徴とするオンデマンド型印
字装置。1. A discharge nozzle for discharging a dot-shaped liquid coating material, a discharge control valve including a valve seat and a valve body provided in a flow path of the discharge nozzle, and a dot-shaped discharge control valve opened and closed. An on-demand type printer having a mechanism for ejecting liquid paint is provided with means for performing volume contraction of the liquid paint remaining in the discharge nozzle after closing the control valve, whereby the liquid paint at the tip of the discharge nozzle is provided. An on-demand type printer characterized in that the interface recedes.
求項１記載の装置。2. The apparatus according to claim 1, comprising a mechanism for cooling the discharge nozzle.
において吐出前の液体塗料を加熱する機構を備える、請
求項１または２記載の装置。3. Behind the control valve (on the side opposite to the discharge nozzle)
The apparatus according to claim 1 or 2, further comprising a mechanism for heating the liquid coating material before being discharged.
である、請求項１〜３のいずれか一つに記載の装置。4. The inner volume of the discharge nozzle is at least 1 mm 3
The device according to any one of claims 1 to 3, wherein
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30786992A JP3262864B2 (en) | 1992-10-23 | 1992-10-23 | On-demand printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30786992A JP3262864B2 (en) | 1992-10-23 | 1992-10-23 | On-demand printer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06135003A true JPH06135003A (en) | 1994-05-17 |
| JP3262864B2 JP3262864B2 (en) | 2002-03-04 |
Family
ID=17974141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30786992A Expired - Lifetime JP3262864B2 (en) | 1992-10-23 | 1992-10-23 | On-demand printer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3262864B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7195345B2 (en) | 1998-11-11 | 2007-03-27 | Seiko Epson Corporation | Ink-jet printing apparatus and ink cartridge |
-
1992
- 1992-10-23 JP JP30786992A patent/JP3262864B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7195345B2 (en) | 1998-11-11 | 2007-03-27 | Seiko Epson Corporation | Ink-jet printing apparatus and ink cartridge |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3262864B2 (en) | 2002-03-04 |
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