JPS59204563A - Control of ink pressure in ink jet recording apparatus - Google Patents

Control of ink pressure in ink jet recording apparatus

Info

Publication number
JPS59204563A
JPS59204563A JP7975983A JP7975983A JPS59204563A JP S59204563 A JPS59204563 A JP S59204563A JP 7975983 A JP7975983 A JP 7975983A JP 7975983 A JP7975983 A JP 7975983A JP S59204563 A JPS59204563 A JP S59204563A
Authority
JP
Japan
Prior art keywords
ink
pressure
nozzle
ink droplet
sensor
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.)
Pending
Application number
JP7975983A
Other languages
Japanese (ja)
Inventor
Arisuke Takeda
有介 武田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP7975983A priority Critical patent/JPS59204563A/en
Publication of JPS59204563A publication Critical patent/JPS59204563A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/195—Ink jet characterised by ink handling for monitoring ink quality

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Ink Jet (AREA)

Abstract

PURPOSE:To eliminate the irregularity in a deflection amount by making a speed constant, by controlling ink supply pressure from the stored length and diameter of a nozzle and the detected temp. and evaporation ratio of an ink liquid. CONSTITUTION:A nozzle diameter, a nozzle length and an ink droplet speed V to be set are preliminarily stored in a pump pressure control part 4 and a temp, an evaporation ratio and supply pressure are detected during printing at every definite time by a temp. sensor ST, an evaporation ratio sensor SE and a pressure sensor SP. By this method, pressure P1 for imparting the ink droplet speed Va is determined from the nozzle diameter, the nozzle length, the ink droplet speed Va, the temp. and the evaporation ratio. In this case, the ink supply pressure P0 in an ink liquid chamber detected by the sensor SP is compared with P1 and P0 is made equal to P1 to obtain the constant ink droplet speed Va.

Description

【発明の詳細な説明】 荻４光１ 本発明は荷電偏向型インクジェット記録装置におけるイ
ンク供給圧力制御方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ink supply pressure control method in a charge deflection type inkjet recording apparatus.

賞米技生 一般に、荷電偏向型インクジェット記録装置においては
、高印字品質を得るために、インク滴の速度を所定の範
囲内に保って偏向量のバラツキをなくすことが重要であ
る。このインク滴の速度は温度、ポンプ圧力等の変動に
よって大きく変わり。In general, in charged deflection type inkjet recording devices, in order to obtain high print quality, it is important to maintain the speed of ink droplets within a predetermined range to eliminate variations in the amount of deflection. The speed of this ink droplet varies greatly depending on changes in temperature, pump pressure, etc.

例えば温度が変化するとインク液の粘度が変化し、その
結果インクがノズルを離れる時の速度が影響を受ける。For example, changes in temperature change the viscosity of the ink fluid, which in turn affects the speed at which the ink leaves the nozzle.

そこでインク滴速度を一定に維持するために、従来 （イ）、インク温度或いはインク供給圧力を検知し、ポ
ンプ圧力を増加又は減少させるようポンプ駆動回路を調
整するもの６ （ロ）、インク滴速度を検知して修正信号を生じさせ、
この修正信号によりポンプ圧力を制御してインク滴速度
を制御するもの。Therefore, in order to maintain a constant ink droplet speed, the conventional method (a) detects the ink temperature or ink supply pressure and adjusts the pump drive circuit to increase or decrease the pump pressure (b). detects and generates a correction signal,
This correction signal controls the pump pressure to control the ink droplet velocity.

（ハ）、インク滴検知器を通常のインク滴偏向領域の直
ぐ外側に配置して最大の偏向を受けたインク滴を検知し
、偏向量が所定範囲内におさまるようにポンプ圧力を増
加又は減少させるもの。(c) An ink drop detector is placed just outside the normal ink drop deflection area to detect the ink drop that has received the maximum deflection, and the pump pressure is increased or decreased until the amount of deflection is within a predetermined range. something that makes you

等が提案されている。しかしながら、インク滴速度はイ
ンク温度、圧力だけでなく、インクの蒸発率、ノズル部
の形状、バラツキ等によっても異なつてくるので、従来
方法ではインク滴速度を高精度に一定にすることはでき
なかった。etc. have been proposed. However, because the ink droplet speed varies not only depending on the ink temperature and pressure, but also on the ink evaporation rate, nozzle shape, variations, etc., it is not possible to keep the ink droplet speed constant with high precision using conventional methods. Ta.

目　　　　　的 本発明は斯様な事情に鑑みなされたもので、インク滴速
度に関与するパラメータの種類を多くしてインク供給圧
力を設定、制御することによりインク滴速度を一定にし
、偏向量のバラツキをなくして印字品質を向上させるこ
とを目的としている。Purpose The present invention has been made in view of the above circumstances, and it is possible to keep the ink droplet velocity constant and eliminate variations in deflection amount by increasing the number of parameters related to the ink droplet velocity and setting and controlling the ink supply pressure. The aim is to eliminate this and improve print quality.

１−一腹 本発明の構成について、以下、実施例に基づき説明する
。1-One Latch The structure of the present invention will be described below based on Examples.

前述したように荷電制御型インクジェット記録装置にお
いて、インク滴の偏向量はインク滴の速度が大きく寄与
する。そしてインク滴速度は、インク液温度、圧力、イ
ンク蒸発率、ノズル径、ノズル長さにより決定される。As described above, in the charge control type inkjet recording apparatus, the speed of the ink droplet greatly contributes to the amount of deflection of the ink droplet. The ink droplet velocity is determined by the ink liquid temperature, pressure, ink evaporation rate, nozzle diameter, and nozzle length.

これらのパラメータを変化させたときのインク滴速度と
インク滴質量の関係は第１図、第２図の様になる。第１
図はインク蒸発率０％の場合、第２図はインク蒸発率２
５％の場合であり、圧力ＰＯは３．０．４．０．５．０
゜６．０の４段階の値、ノズル径Ｄｏは３Ｌ、０．３１
．５゜３２．０．ノズル長さＬｓは１５．２０．２５の
３段階の値、温度ＴＥは５段階の値がとっである。いま
第１図、第２図に於いて、インク蒸発率（ＥＲ）。The relationship between the ink droplet velocity and the ink droplet mass when these parameters are changed is as shown in FIGS. 1 and 2. 1st
The figure shows an ink evaporation rate of 0%, and the second figure shows an ink evaporation rate of 2.
In the case of 5%, the pressure PO is 3.0.4.0.5.0
4-step value of ゜6.0, nozzle diameter Do is 3L, 0.31
．． 5゜32.0. The nozzle length Ls has three values of 15, 20, and 25, and the temperature TE has five values. Now in Figures 1 and 2, the ink evaporation rate (ER).

温度（ＴＥ）、ノズル長さくＬｓ）、ノズル径（Ｄｏ）
を一定にし、インク滴速度■と圧力Ｐの関係を読み取る
と第３図の様になる。ここでＰａ。Temperature (TE), nozzle length Ls), nozzle diameter (Do)
If the relationship between the ink droplet velocity (■) and the pressure P is read while keeping it constant, the result will be as shown in Fig. 3. Here Pa.

Ｐｂは流量をある一定の範囲内に制限したときのインク
供給圧力の最小値、最大値である。第３図において、偏
向量の関係で設定すべきインク滴速度Ｖａが与えられた
とき、これを満たす圧力Ｐは一点Ｐ１に決まる。この圧
力Ｐ１はインク液温度。Pb is the minimum value and maximum value of the ink supply pressure when the flow rate is restricted within a certain range. In FIG. 3, when an ink droplet velocity Va to be set in relation to the amount of deflection is given, the pressure P that satisfies this is determined at one point P1. This pressure P1 is the ink liquid temperature.

インク蒸発率、ノズル径、ノズル長さの関数であり、Ｐ
ｌ　＝ｆ　　（ＴＥ、ＥＲ，Ｄｏ、Ｌｓ）　　と表現で
き、関数ｆは既知であるのでインク液温度、インク蒸発
率、ノズル径、ノズル長さが与えられれば圧力Ｐ１が決
まり、この圧力に制御することにより一定のインク滴速
度にすることができ、偏向量が一定になり高印字品質を
得ることができる。It is a function of ink evaporation rate, nozzle diameter, and nozzle length, and P
It can be expressed as l = f (TE, ER, Do, Ls), and since the function f is known, if the ink liquid temperature, ink evaporation rate, nozzle diameter, and nozzle length are given, the pressure P1 is determined, and this pressure is controlled. By doing so, it is possible to maintain a constant ink droplet velocity, the amount of deflection is constant, and high print quality can be obtained.

第４図は本発明の一実施例を示す構成ブロック３− 図で、インクジェットへラド１へはポンプ２から加圧イ
ンク液が供給され、インク滴３が噴射されている。４は
ポンプ圧力制御部で、あらかじめノズル径、ノズル長さ
、設定すべきインク滴速度■ａを記憶させておく。そし
て印字中、一定時間毎に温度センサＳＴ、蒸発率センサ
ＳＥ、圧力センサＳＰによりインク液温度、インク蒸発
率、インク供給圧力を検知する。こうして記憶されたノ
ズル径、ノズル長さ、インク滴速度Ｖ　ａ　、検知した
温度、蒸発率から第３図で示すようなインク滴速度Ｖａ
を与える圧力Ｐ１を決定する。そしてセンサＳＰにより
検知した液室内のインク供給圧力ＰＯとＰｌとを比較し
、ＰＩ＞ＰＯであれば減圧の方向へ、ＰＩ＜ＰＯであれ
ば増圧の方向へポンプを駆動制御し、ＰＩ　＝Ｐｏとな
るようにして一定のインク滴速度Ｖａを得る。なお、蒸
発率センサＳＥは、液の比重を検出し、蒸発率０％の状
態の比重と比較して液の蒸発率を決定する機能をもつセ
ンサである。なお、第５図に第４図に示した実施例のフ
ローチャートを示す。FIG. 4 is a block 3 diagram showing an embodiment of the present invention, in which pressurized ink liquid is supplied from a pump 2 to an ink jet heater 1, and ink droplets 3 are ejected. Reference numeral 4 denotes a pump pressure control section in which the nozzle diameter, nozzle length, and ink droplet velocity (a) to be set are stored in advance. During printing, the temperature sensor ST, evaporation rate sensor SE, and pressure sensor SP detect the ink liquid temperature, ink evaporation rate, and ink supply pressure at regular intervals. From the nozzle diameter, nozzle length, ink droplet velocity Va, detected temperature, and evaporation rate thus stored, the ink droplet velocity Va as shown in FIG.
Determine the pressure P1 that gives . Then, the ink supply pressure PO in the liquid chamber detected by the sensor SP is compared with Pl, and if PI>PO, the pump is driven and controlled in the direction of pressure reduction, and if PI<PO, the pump is driven and controlled in the direction of pressure increase, and PI = Po, thereby obtaining a constant ink droplet velocity Va. The evaporation rate sensor SE is a sensor that has a function of detecting the specific gravity of the liquid and comparing it with the specific gravity in a state where the evaporation rate is 0% to determine the evaporation rate of the liquid. Incidentally, FIG. 5 shows a flowchart of the embodiment shown in FIG. 4.

４− 勤一一二果 以上のように本発明によればインク滴速度に関与するパ
ラメータを従来より広げてポンプ圧力を設定するように
したので、高精度にインク滴速度を一定にすることがで
き、偏向量のバラツキをなくすことができるので高印字
品質を達成することができる。4-Kin 112 As described above, according to the present invention, the pump pressure is set by expanding the parameters related to the ink droplet velocity than before, making it possible to keep the ink droplet velocity constant with high precision. Since it is possible to eliminate variations in the amount of deflection, high print quality can be achieved.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図、第２図はインク滴速度とインク滴質量の関係を
示す図、第３図は圧力とインク滴速度の関係を示す図、
第４図は本発明の実施例のブロック構成図、第５図はフ
ローチャートである。 ■・・・インクジェットヘッド、２・・・ポンプ、３・
・・インク滴、４・・・制御部、ＳＴ・・・温度センサ
、ＳＥ・・・蒸発率センサ、ＳＰ・・圧力センサ。Figures 1 and 2 are diagrams showing the relationship between ink droplet velocity and ink droplet mass, and Figure 3 is a diagram showing the relationship between pressure and ink droplet velocity.
FIG. 4 is a block diagram of an embodiment of the present invention, and FIG. 5 is a flowchart. ■...Inkjet head, 2...Pump, 3.
...Ink droplet, 4...Control unit, ST...Temperature sensor, SE...Evaporation rate sensor, SP...Pressure sensor.

Claims (1)

【特許請求の範囲】[Claims] インク液を噴出するノズルの長さ及び径を予め記憶する
と共に印字中の一定時間間隔毎にインク液温度、インク
液蒸発率を検出し、前記記憶されているノズルの長さ及
び径と検出したインク液温度、インク液蒸発率からイン
ク供給圧力を設定し、該設定した圧力にインク供給圧力
を制御するようにしたことを特徴とするインクジェット
記録装置におけるインク圧力制御方法。The length and diameter of the nozzle that ejects ink liquid is memorized in advance, and the ink liquid temperature and ink liquid evaporation rate are detected at fixed time intervals during printing, and the length and diameter of the nozzle are detected as the stored nozzle length and diameter. An ink pressure control method for an inkjet recording apparatus, characterized in that the ink supply pressure is set based on the ink liquid temperature and the ink liquid evaporation rate, and the ink supply pressure is controlled to the set pressure.
JP7975983A 1983-05-07 1983-05-07 Control of ink pressure in ink jet recording apparatus Pending JPS59204563A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7975983A JPS59204563A (en) 1983-05-07 1983-05-07 Control of ink pressure in ink jet recording apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7975983A JPS59204563A (en) 1983-05-07 1983-05-07 Control of ink pressure in ink jet recording apparatus

Publications (1)

Publication Number Publication Date
JPS59204563A true JPS59204563A (en) 1984-11-19

Family

ID=13699143

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7975983A Pending JPS59204563A (en) 1983-05-07 1983-05-07 Control of ink pressure in ink jet recording apparatus

Country Status (1)

Country Link
JP (1) JPS59204563A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1048470A1 (en) * 1999-04-28 2000-11-02 Imaje S.A. Ink jet printer and method for controlling the ink quality in such a printer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1048470A1 (en) * 1999-04-28 2000-11-02 Imaje S.A. Ink jet printer and method for controlling the ink quality in such a printer
FR2792874A1 (en) * 1999-04-28 2000-11-03 Imaje Sa INK-JET PRINTER AND METHOD FOR MANAGING THE QUALITY OF THE INK OF SUCH A PRINTER

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