JPH0251736B2 - - Google Patents
Info
- Publication number
- JPH0251736B2 JPH0251736B2 JP56073985A JP7398581A JPH0251736B2 JP H0251736 B2 JPH0251736 B2 JP H0251736B2 JP 56073985 A JP56073985 A JP 56073985A JP 7398581 A JP7398581 A JP 7398581A JP H0251736 B2 JPH0251736 B2 JP H0251736B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- head
- voltage
- heater
- ink
- 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.)
- Expired - Lifetime
Links
- 239000007788 liquid Substances 0.000 claims description 15
- 230000007613 environmental effect Effects 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 230000010259 detection of temperature stimulus Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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)
Description
【発明の詳細な説明】
本発明は、ヘツドから噴射するインクの温度を
制御する液温制御装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid temperature control device for controlling the temperature of ink ejected from a head.
従来、インクジエツトプリンタのインクの温度
を制御する液温制御装置は第１図に示したように
構成されている。第１図において、１はヘツド、
２はノズル、３はインク滴であり、ヘツド１に設
けた圧電振動子によつてノズル２から常時インク
滴３が噴出され、このインク滴３を荷電滴または
非荷電滴にすることによつて、この荷電インク滴
または非荷電インク滴を選択し、記録紙に文字ま
たは図形を記録し、記録に供しないインク滴は回
収して再使用している。このノズル２から噴射さ
れるインク滴３は温度によつて粒径が変化するの
で、記録紙に描かれた文字または図形の画質を一
定にするために、ヘツドに供給されるインクの温
度を常に一定にする液温制御装置が設けられてい
る。即ち、４はヘツド１に設けた温度検出器、５
はコントローラ、６はヘツド１に供給するインク
を加熱するヒータ、７はヒータ６で加熱されたイ
ンク７を供給するチユーブである。 Conventionally, a liquid temperature control device for controlling the temperature of ink in an inkjet printer has been constructed as shown in FIG. In Figure 1, 1 is the head;
2 is a nozzle, 3 is an ink droplet, and an ink droplet 3 is constantly ejected from the nozzle 2 by a piezoelectric vibrator provided in the head 1, and the ink droplet 3 is made into a charged droplet or a non-charged droplet. The charged or non-charged ink droplets are selected to record characters or figures on recording paper, and the ink droplets that are not used for recording are collected and reused. Since the particle size of the ink droplets 3 ejected from this nozzle 2 changes depending on the temperature, the temperature of the ink supplied to the head is constantly adjusted to maintain a constant image quality of characters or figures drawn on the recording paper. A liquid temperature control device is provided to keep it constant. That is, 4 is a temperature sensor provided in the head 1;
6 is a controller, 6 is a heater that heats the ink supplied to the head 1, and 7 is a tube that supplies the ink 7 heated by the heater 6.
このように構成した従来の液温制御装置では、
インクがヒータ６で加熱され、ヘツド１に伝わる
までにチユーブ７の長さｌをインクが流れる時間
だけ温度変化の検出が遅れる。またインクの流量
は毎分１c.c.程度であるため、ヒータ６で加熱され
たインクでヘツド１が加熱されるには数10秒もか
かるので、温度検出器４でヘツド１の温度が所定
の温度になつたことを検出するまでの時間は非常
に長く、従つてコントローラ５の応答速度が早い
ときには、ヒータ６内のインクの温度は異常に上
昇し、激しい時には沸騰してしまうことさえある
という欠点があり、更に、ヒータ６が焼損した
り、また高温にさらされるためにインクが劣化し
たりする欠点があつた。また温度検出器４がヘツ
ド１に接しているため、ヘツド１の方向が微妙に
変化し、インクの噴射方向が変化したり、ヘツド
の構造が複雑になるという欠点があつた。 In the conventional liquid temperature control device configured in this way,
The ink is heated by the heater 6, and detection of temperature changes is delayed by the time the ink flows through the length l of the tube 7 before being transmitted to the head 1. Furthermore, since the flow rate of ink is about 1 c.c. per minute, it takes several tens of seconds for the head 1 to be heated by the ink heated by the heater 6. It takes a very long time to detect that the ink has reached the temperature of In addition, there were other drawbacks such as the heater 6 burning out and the ink deteriorating due to exposure to high temperatures. Further, since the temperature detector 4 is in contact with the head 1, there are disadvantages in that the direction of the head 1 changes slightly, the direction of ink jetting changes, and the structure of the head becomes complicated.
このような欠点を除去するために、従来はコン
トローラ５の応答速度を遅くしたり、印加電圧を
制限したりしていたが、ヘツド１から流出するイ
ンクの温度の立上りが非常に遅くなるという欠点
があつた。 In order to eliminate such drawbacks, the response speed of the controller 5 has traditionally been slowed down or the applied voltage has been limited, but the disadvantage is that the temperature of the ink flowing out from the head 1 rises very slowly. It was hot.
本発明は、上記従来例の欠点を解消するため
に、記録液滴を飛翔させる為のヘツド１と、該ヘ
ツドに記録液を供給する為の流路７と、該流路の
一部に設けられた前記記録液体を加熱する為のヒ
ータ６とを有するインクジエツトプリンタにおい
て、前記ヘツドに非接触状態で設けられ、環境温
度を検出する為の第１の温度検出器８と、前記ヒ
ータに設けられ、前記第１の温度検出器と等しい
温度係数を有する前記ヒータの温度を検出する為
の第２の温度検出器９と、前記第１の温度検出器
の出力電圧と前記第２の温度検出器の出力電圧と
を加算する為の電圧加算手段１０と、予め設定さ
れた基準電圧と前記電圧加算手段の出力電圧との
差分電圧を発生させる為のコントローラ５と、該
コントローラの出力電圧を前記ヒータに供給する
為の電圧供給手段とを有することを特徴とし、そ
の目的はヘツドから流出する液温を環境温度の変
化にかかわらず一定に制御するようにした液温制
御装置を提供するものである。以下、図面により
実施例を詳細に説明する。 In order to eliminate the drawbacks of the conventional example, the present invention provides a head 1 for flying recording droplets, a flow path 7 for supplying recording liquid to the head, and a head 1 provided in a part of the flow path. The inkjet printer includes a heater 6 for heating the recording liquid, which is provided in the head in a non-contact state, and a first temperature detector 8 for detecting environmental temperature, and a first temperature detector 8 provided in the heater. a second temperature detector 9 for detecting the temperature of the heater, which has a temperature coefficient equal to that of the first temperature detector, and detects the output voltage of the first temperature detector and the second temperature detector. a controller 5 for generating a differential voltage between a preset reference voltage and the output voltage of the voltage adding means; The object of the present invention is to provide a liquid temperature control device which is characterized by having a voltage supply means for supplying voltage to the heater, and whose purpose is to control the temperature of the liquid flowing out from the head to be constant regardless of changes in the environmental temperature. be. Hereinafter, embodiments will be described in detail with reference to the drawings.
第２図は、本発明の一実施例のブロツク図を示
したもので、１はヘツド、２はノズル、３はイン
ク滴、５はコントローラ、６はヒータ、７はチユ
ーブ、８はヘツドに非接触で設けた第１の温度検
出器、９はヒータ６に設けた第２の温度検出器で
あり、第１、第２の温度検出器８，９の出力は加
算器１０に入力され、加算器１０の出力と基準電
圧Vrefとの差電圧によりコントローラ５でヒータ
６を制御している。また温度検出器８，９の温度
係数を同一にする。 FIG. 2 shows a block diagram of an embodiment of the present invention, in which 1 is a head, 2 is a nozzle, 3 is an ink droplet, 5 is a controller, 6 is a heater, 7 is a tube, and 8 is a non-head part. A first temperature sensor 9 is provided by contact, and a second temperature sensor 9 is provided on the heater 6. The outputs of the first and second temperature detectors 8 and 9 are input to an adder 10 and added. The heater 6 is controlled by the controller 5 based on the voltage difference between the output of the heater 10 and the reference voltage V ref . Furthermore, the temperature coefficients of the temperature detectors 8 and 9 are made the same.
次に、本実施例の液温制御装置の動作を第３図
により説明する。まず、環境温度がTaがａ℃の
とき、ヘツド１から流出するインクの温度をＡ℃
とする。この時、第１の温度検出器８の検出電圧
をVS1、第２の温度検出器９の検出電圧をVS2、
コントローラ５の温度設定電圧をVrefとすれば、
VS1＋VS2≒Vref
Vref−（VS1＋VS2）≒０
となるようにヒータ６に電圧が印加される。環境
温度Taが変化してｂ℃に上昇したとすると、環
境温度Taの変化分ΔTaは、
ΔTa（ｂ−ａ）℃
となり、この温度変化分ΔTaは第１の温度検出
器８で検出され、ΔTaに相当する電圧が上昇す
る。従つて、コントローラ５は第２の温度検出器
９の出力電圧をΔTaに相当する分だけ下げるよ
うにヒータ６の電圧VHを下げる。このように、
ヘツド１から流出するインクの温度Tiは一定の
温度Tioに保たれる。更に環境温度が上昇してｃ
℃になつた時も、同様に第２の温度検出器９の出
力電圧を、環境温度が上がつた分だけ下げるよう
に動作する。また環境温度が下がつた時には、ヒ
ータ６の印加電圧VHが増加してヘツド１から流
出するインクの温度Tiが一定温度Tioに保たれ
る。 Next, the operation of the liquid temperature control device of this embodiment will be explained with reference to FIG. First, when the environmental temperature Ta is a degree Celsius, the temperature of the ink flowing out from head 1 is A degree Celsius.
shall be. At this time, the detection voltage of the first temperature detector 8 is VS 1 , the detection voltage of the second temperature detector 9 is VS 2 ,
If the temperature setting voltage of the controller 5 is Vref , a voltage is applied to the heater 6 so that VS 1 +VS 2 ≒V ref V ref −(VS 1 +VS 2 )≒0. Assuming that the environmental temperature Ta changes and rises to b°C, the change ΔTa in the environmental temperature Ta becomes ΔTa(ba-a)°C, and this temperature change ΔTa is detected by the first temperature detector 8, The voltage corresponding to ΔTa increases. Therefore, the controller 5 lowers the voltage V H of the heater 6 so as to lower the output voltage of the second temperature detector 9 by an amount corresponding to ΔTa. in this way,
The temperature Ti of the ink flowing out from the head 1 is kept at a constant temperature Tio. Furthermore, as the environmental temperature rises, c
℃, the output voltage of the second temperature detector 9 is similarly lowered by the amount that the environmental temperature has increased. Furthermore, when the environmental temperature drops, the voltage V H applied to the heater 6 increases, and the temperature Ti of the ink flowing out from the head 1 is maintained at a constant temperature Tio.
このように、ヘツド１に非接触で第１の温度検
出器８を設けたので、環境温度の変化にかかわら
ず、ヘツド１から流出する液体温度を一定に保つ
ことができる。また第２の温度検出器９によつて
最高温度が抑えられるので、インクを過熱した
り、ヒータ６を焼損することもなく、安全な装置
を提供することができる。 In this way, since the first temperature detector 8 is provided in the head 1 in a non-contact manner, the temperature of the liquid flowing out from the head 1 can be kept constant regardless of changes in the environmental temperature. Furthermore, since the maximum temperature is suppressed by the second temperature detector 9, the ink does not overheat or the heater 6 burns out, making it possible to provide a safe apparatus.
なお、第１、第２の温度検出器８，９は感温抵
抗に一定の電流を流し、この抵抗の両端の電圧を
取り出すようにしてもよいし、またトランジスタ
のベース・エミツタの電圧Vbeの温度特性を利用
してもよい。更に、第１、第２の温度検出器８，
９の温度係数を同一とし、ヒータ６はできるだけ
熱的応答が早いことが望ましい。また第１の温度
検出器８はヘツド１から離した方が良いが、イン
クの噴射方向に影響を与えず、ヘツド周囲の構造
が複雑にならなければ、第１の温度検出器８をヘ
ツド１に取り付けてもよい。 Note that the first and second temperature detectors 8 and 9 may be arranged so that a constant current is passed through a temperature-sensitive resistor and the voltage across the resistor is taken out, or the voltage Vbe between the base and emitter of the transistor is detected. Temperature characteristics may also be used. Furthermore, first and second temperature detectors 8,
It is desirable that the temperature coefficients of the heaters 9 and 9 be the same, and that the heater 6 has as fast a thermal response as possible. Also, it is better to place the first temperature sensor 8 away from the head 1, but if it does not affect the ink ejection direction and the structure around the head does not become complicated, the first temperature sensor 8 should be placed away from the head 1. It may be attached to.
以上説明したように、本発明によれば、第１の
温度検出器で環境温度を検出し、第２の温度検出
器でヒータの温度を検出し、第１、第２の温度検
出器の出力電圧の和と、所定の温度を与える基準
電圧との差電圧により、ヘツドから噴射するイン
クの温度を制御するようにしたので、環境温度の
変化にもかかわらず、ヘツドから流出するインク
の温度を一定に制御することができ、またヒータ
６の最高温度が第２の温度検出器によつて抑えら
れるので、インクが過熱したり、ヒータが焼損す
ることがないという利点がある。 As explained above, according to the present invention, the first temperature detector detects the environmental temperature, the second temperature detector detects the temperature of the heater, and the outputs of the first and second temperature detectors are The temperature of the ink ejected from the head is controlled by the voltage difference between the sum of the voltages and the reference voltage that gives a predetermined temperature, so the temperature of the ink flowing out from the head can be controlled regardless of changes in the environmental temperature. Since the temperature can be controlled to be constant and the maximum temperature of the heater 6 is suppressed by the second temperature detector, there is an advantage that the ink does not overheat or the heater burns out.
第１図は、温度制御装置を設けた従来のインク
ジエツトプリンタの一部の構成図、第２図は、本
発明の１実施例の液温制御装置を有するインクジ
エツトプリンタの一部の構成図、第３図は、第２
図の動作を説明するための各部の出力電圧の変化
を示した図である。
１……ヘツド、２……ノズル、３……インク
滴、４……温度検出器、５……コントローラ、６
……ヒータ、７……チユーブ、８……第１の温度
検出器、９……第２の温度検出器、１０……加算
器。
FIG. 1 is a partial configuration diagram of a conventional inkjet printer equipped with a temperature control device, and FIG. 2 is a partial configuration diagram of an inkjet printer equipped with a liquid temperature control device according to an embodiment of the present invention. , Figure 3 shows the second
FIG. 3 is a diagram showing changes in output voltage of each part for explaining the operation of the diagram. 1...Head, 2...Nozzle, 3...Ink droplet, 4...Temperature detector, 5...Controller, 6
... Heater, 7 ... Tube, 8 ... First temperature detector, 9 ... Second temperature detector, 10 ... Adder.
Claims (1)
ドに記録液を供給する為の流路と、該流路の一部
に設けられた前記記録液体を加熱する為のヒータ
とを有するインクジエツトプリンタにおいて、前
記ヘツドに非接触状態で設けられ、環境温度を検
出する為の第１の温度検出器と、前記ヒータに設
けられ、前記第１の温度検出器と等しい温度係数
を有する前記ヒータの温度を検出する為の第２の
温度検出器と、前記第１の温度検出器の出力電圧
と前記第２の温度検出器の出力電圧とを加算する
為の電圧加算手段と、予め設定された基準電圧と
前記電圧加算手段の出力電圧との差分電圧を発生
させる為のコントローラと、該コントローラの出
力電圧を前記ヒータに供給する為の電圧供給手段
とを有することを特徴とする液温制御装置。1. An ink jet having a head for ejecting recording liquid droplets, a flow path for supplying recording liquid to the head, and a heater provided in a part of the flow path for heating the recording liquid. In the printer, a first temperature sensor is provided in the head in a non-contact state for detecting environmental temperature, and a first temperature sensor is provided in the heater and has a temperature coefficient equal to that of the first temperature sensor. a second temperature detector for detecting temperature; a voltage adding means for adding the output voltage of the first temperature detector and the output voltage of the second temperature detector; A liquid temperature control device comprising: a controller for generating a differential voltage between a reference voltage and an output voltage of the voltage adding means; and a voltage supply means for supplying the output voltage of the controller to the heater. .
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7398581A JPS57188363A (en) | 1981-05-15 | 1981-05-15 | Liquid temperature controller |
| US06/374,531 US4459469A (en) | 1981-05-15 | 1982-05-03 | Ink temperature control apparatus for ink jet printing apparatus |
| DE19823218263 DE3218263A1 (en) | 1981-05-15 | 1982-05-14 | Ink temperature control device for an ink jet printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7398581A JPS57188363A (en) | 1981-05-15 | 1981-05-15 | Liquid temperature controller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57188363A JPS57188363A (en) | 1982-11-19 |
| JPH0251736B2 true JPH0251736B2 (en) | 1990-11-08 |
Family
ID=13533902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7398581A Granted JPS57188363A (en) | 1981-05-15 | 1981-05-15 | Liquid temperature controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57188363A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59123263A (en) * | 1982-12-28 | 1984-07-17 | Toshiba Corp | Light-driven type semiconductor device |
| JPS59133062A (en) * | 1983-01-21 | 1984-07-31 | Konishiroku Photo Ind Co Ltd | Heating power controller for inkjet printer |
| JPS59171191A (en) * | 1983-03-17 | 1984-09-27 | 松下電器産業株式会社 | Method of printing thick film circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49101473A (en) * | 1972-12-27 | 1974-09-25 | ||
| JPS5129840A (en) * | 1974-09-06 | 1976-03-13 | Nippon Telegraph & Telephone | |
| JPS5197933A (en) * | 1975-02-26 | 1976-08-28 | ||
| JPS55152065A (en) * | 1979-05-17 | 1980-11-27 | Ricoh Co Ltd | Ink jet recorder |
| JPS5673986A (en) * | 1979-11-21 | 1981-06-19 | Toshiba Corp | Magnetic recording and rerproducing device |
-
1981
- 1981-05-15 JP JP7398581A patent/JPS57188363A/en active Granted
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49101473A (en) * | 1972-12-27 | 1974-09-25 | ||
| JPS5129840A (en) * | 1974-09-06 | 1976-03-13 | Nippon Telegraph & Telephone | |
| JPS5197933A (en) * | 1975-02-26 | 1976-08-28 | ||
| JPS55152065A (en) * | 1979-05-17 | 1980-11-27 | Ricoh Co Ltd | Ink jet recorder |
| JPS5673986A (en) * | 1979-11-21 | 1981-06-19 | Toshiba Corp | Magnetic recording and rerproducing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57188363A (en) | 1982-11-19 |
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