JPH0747315B2 - Impact printer - Google Patents
Impact printerInfo
- Publication number
- JPH0747315B2 JPH0747315B2 JP61243088A JP24308886A JPH0747315B2 JP H0747315 B2 JPH0747315 B2 JP H0747315B2 JP 61243088 A JP61243088 A JP 61243088A JP 24308886 A JP24308886 A JP 24308886A JP H0747315 B2 JPH0747315 B2 JP H0747315B2
- Authority
- JP
- Japan
- Prior art keywords
- print head
- power supply
- drive
- time
- supply voltage
- 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
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
- B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
- B41J2/23—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using print wires
- B41J2/30—Control circuits for actuators
Landscapes
- Dot-Matrix Printers And Others (AREA)
- Impact Printers (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明はインパクトプリンタに関し、特に小型インパク
トプリンタにおけるプリントヘッドの駆動時間の制御方
法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impact printer, and more particularly to a method for controlling a print head drive time in a small impact printer.
（従来の技術） 第４図はインパクトプリンタの構成を示すブロック図で
ある。同図において、41は後述するプリントヘッド44に
電力を供給する電源回路、42は電源回路41を介した電源
電圧を監視し、適切な電源電圧に相当するように後述す
るプリントヘッド駆動回路43に対して制御信号を出力す
る制御回路、43は制御回路42からの制御信号の基づいて
設定された時間で後述するプリントヘッド44を駆動させ
るプリントヘッド駆動回路、44は印字媒体に対して適切
な衝撃力を与え、印字を行うプリントヘッドである。(Prior Art) FIG. 4 is a block diagram showing a configuration of an impact printer. In the figure, 41 is a power supply circuit for supplying electric power to a print head 44 described later, 42 is a power supply voltage via the power supply circuit 41, and a print head drive circuit 43 described later is arranged so as to correspond to an appropriate power supply voltage. A control circuit that outputs a control signal to the control circuit 43 is a print head drive circuit that drives a print head 44 described later at a time set based on the control signal from the control circuit 42, and 44 is an appropriate impact on the print medium. A print head that applies force to perform printing.
次に、第４図に示したインパクトプリンタの動作を説明
する。Next, the operation of the impact printer shown in FIG. 4 will be described.
プリントヘッド44を駆動するためには一回の印字毎に一
定量以上のエネルギー供給を要する。そのため、図示し
ていない駆動用電源装置にはプリントヘッド44に対して
十分なエネルギー供給が可能な大型のものが必要とな
る。これに反して図示していない駆動用電源装置を小型
にした場合、プリントヘッド44の駆動に伴って電源電圧
が降下してプリントヘッド44の駆動電流も減少し、プリ
ントヘッド44へ供給される電力は大幅に減少する。この
ため、プリントヘッド44の駆動時間を一定とする場合、
駆動エネルギーが大幅に減少して必要な印字力を得るこ
とが困難となる。In order to drive the print head 44, it is necessary to supply a certain amount of energy or more for each printing. For this reason, a driving power supply device (not shown) is required to be large in size and capable of supplying sufficient energy to the print head 44. On the other hand, when the driving power supply device (not shown) is downsized, the power supply voltage drops as the print head 44 is driven, the drive current of the print head 44 also decreases, and the power supplied to the print head 44 decreases. Is greatly reduced. Therefore, when the drive time of the print head 44 is constant,
The driving energy is greatly reduced and it becomes difficult to obtain the required printing force.
そこで、制御回路42は電源電圧を監視し、電源電圧が降
下した場合駆動エネルギーの減少を補うためにプリント
ヘッド44の駆動時間を伸長させる制御を行う。すなわ
ち、図示していない駆動用電源装置の電源電圧と所望の
印字力を確保するための駆動時間の関係を示す第５図の
特性図からわかるように、電源電圧に対応してプリント
ヘッド44の駆動時間を調節して、図示していない駆動用
電源装置の小型化が図られてきた。Therefore, the control circuit 42 monitors the power supply voltage and, when the power supply voltage drops, performs control to extend the drive time of the print head 44 in order to compensate for the decrease in drive energy. That is, as can be seen from the characteristic diagram of FIG. 5 showing the relationship between the power supply voltage of the drive power supply device (not shown) and the drive time for ensuring the desired printing power, the print head 44 corresponding to the power supply voltage The drive time has been adjusted to reduce the size of a drive power supply device (not shown).
（発明が解決しようとする問題点） しかしながら、上記従来の構成では電源電圧が大幅に降
下した場合、プリントヘッドの駆動時間の伸長によって
所望の印字力は確保できる反面、印字の高速化を図るこ
とができない。また、極端に低い電源電圧のときには駆
動時間を増してもプリントヘッドの発熱が増すのみで印
字力の向上にはあまり寄与しないという欠点があった。(Problems to be Solved by the Invention) However, in the above-described conventional configuration, when the power supply voltage is drastically lowered, the desired printing power can be secured by extending the driving time of the print head, but the printing speed is increased. I can't. Further, when the power supply voltage is extremely low, even if the driving time is increased, the heat generated by the print head is increased, but it does not contribute much to the improvement of the printing power.
本発明はこれらの問題点を解決するためのもので、小型
化及び印字動作の高速化を図れるインパクトプリンタを
提供することを目的とする。The present invention is intended to solve these problems, and an object of the present invention is to provide an impact printer that can be downsized and the printing operation can be speeded up.
（問題点を解決するための手段） 本発明は前記問題点を解決するために、印字媒体に対し
て活字又はドットを機械的あるいは電磁的に圧すること
によって印字するプリントヘッドと、このプリントヘッ
ドに駆動電力を供給する駆動回路と、電源電圧を監視し
て印字に必要な駆動電力を確保する駆動時間を設定する
制御回路とを具備するインパクトプリンタであって、こ
の制御回路に更に、もし電源電圧が所定値より低下した
ときの駆動時間を予め設定した所定の限界値とする手段
を設けたことに特徴がある。(Means for Solving Problems) In order to solve the above problems, the present invention provides a print head that prints by mechanically or electromagnetically pressing a character or a dot on a print medium, and a print head. An impact printer comprising a drive circuit that supplies drive power and a control circuit that monitors the power supply voltage and sets a drive time that secures the drive power necessary for printing. Is provided with a means for setting the driving time when is lower than a predetermined value to a preset predetermined limit value.
（作用） 以上のような構成を有する本発明によれば、プリントヘ
ッドを駆動させる電源電圧が装置の小型化に伴って大幅
に低下したとき、所望の印字力を確保するために駆動時
間を伸長されるわけであるが、この際制御回路は駆動時
間を単に増加させるのではなく最低限の印字力を維持で
きる所定の限界値以上に止どめておくように駆動時間を
調整する。(Operation) According to the present invention having the above-described configuration, when the power supply voltage for driving the print head is significantly reduced due to the downsizing of the apparatus, the driving time is extended to secure a desired printing force. However, at this time, the control circuit does not simply increase the driving time, but adjusts the driving time so that the driving time is kept above a predetermined limit value capable of maintaining the minimum printing force.
したがって、本発明は前記問題点を解決することがで
き、低電源電圧時のプリントヘッドの駆動時間の過大な
伸長と、これにより生ずるプリントヘッドの電力損失、
発熱を押え、小型化及び印字動作の高速化を図れるイン
パクトプリンタを提供できる。Therefore, the present invention can solve the above problems, and excessively prolongs the drive time of the print head at a low power supply voltage, resulting in the power loss of the print head.
It is possible to provide an impact printer that can suppress heat generation, can be downsized, and can speed up printing operation.
（実施例） 以下、本発明の一実施例を図面に基づいて説明する。(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.
第１図は本発明の一実施例を示す回路図である。同図に
おいて、１は入力端子、２は出力レベルとして高レベ
ル、低レベル、さらにオフ状態の三つの状態があるトラ
イステート回路、３は抵抗、４はコンデンサ、５はコン
パレータ、６はNAND単安定マルチバイブレータである。
また、同図において、A,Bは測定点である。FIG. 1 is a circuit diagram showing an embodiment of the present invention. In the figure, 1 is an input terminal, 2 is a tri-state circuit that has three levels of high level, low level, and off state as output level, 3 is a resistor, 4 is a capacitor, 5 is a comparator, 6 is NAND monostable. It is a multivibrator.
In the figure, A and B are measurement points.
次に、本実施例の動作について、第１図及び第１図にお
ける測定点での信号波形を示す第２図を用いて説明す
る。Next, the operation of this embodiment will be described with reference to FIG. 1 and FIG. 2 showing signal waveforms at measurement points in FIG.
先ず、プリントヘッドの駆動開始を指令する負極性の信
号が入力端子１に印加される。この信号はトライステー
ト回路２を低レベル状態にし、コンデンサ４に充電され
ていた電荷が第２図の測定点Ｂの波形からわかるように
時刻t0で急速に放電する。これに伴う測定点Ｂの電圧低
下をコンパレータ５で検出し、図示していないプリント
ヘッドに駆動時間制御信号が供給される。First, a negative signal for instructing to start driving the print head is applied to the input terminal 1. This signal puts the tri-state circuit 2 into a low level state, and the electric charge stored in the capacitor 4 is rapidly discharged at time t 0 as can be seen from the waveform at the measurement point B in FIG. The comparator 5 detects the accompanying voltage drop at the measurement point B, and a drive time control signal is supplied to a print head (not shown).
そして、入力端子１に印加された信号がＨレベルになる
と、トライステート回路２は高インピーダンス、すなわ
ちオフ状態となる。よって、コンデンサ４には抵抗３な
どから決まる時定数で電荷が第２図の測定点Ｂの波形か
らわかるように時刻t1から充電されていく。Then, when the signal applied to the input terminal 1 becomes H level, the tri-state circuit 2 is in a high impedance state, that is, in an off state. Therefore, the capacitor 4 is charged with electric charge at a time constant determined by the resistor 3 and the like from time t 1 as can be seen from the waveform at the measurement point B in FIG.
一方、先のプリントヘッドの駆動開始を指令する負極性
の信号の立ち下がりエッジにより、NAND単安定マルチバ
イブレータ６をトリガし、測定点Ａは第２図に示すよう
にＬレベルになる。プリントヘッドの駆動電圧が低い状
態にあり、測定点Ｂの電圧がコンパレータ５の検出電圧
に達するまでの時間が長くなってNAND単安定マルチバイ
ブレータ６により定まる時間Ｔより大きくなると、第２
図で時刻t2においてトライステート回路２はオフ状態か
ら高レベル状態へと移行する。この時、コンデンサ４に
は急速に充電されてプリントヘッドの駆動を終了させ
る。したがって、本実施例における図示していない駆動
用電源装置の電源電圧と所望の印字力を確保するための
プリントヘッドの駆動時間の関係を示す第３図の特性図
からわかるように、電源電圧が低くなっても第１図のNA
ND単安定マルチバイブレータ６によって設定された時間
Ｔ以上の駆動時間にはならない。On the other hand, the NAND monostable multivibrator 6 is triggered by the falling edge of the negative signal that commands the start of driving of the preceding printhead, and the measurement point A becomes the L level as shown in FIG. If the drive voltage of the print head is low and the time until the voltage at the measurement point B reaches the detection voltage of the comparator 5 becomes longer and becomes longer than the time T determined by the NAND monostable multivibrator 6, the second
In the figure, at time t 2 , the tri-state circuit 2 shifts from the off state to the high level state. At this time, the capacitor 4 is rapidly charged to end the driving of the print head. Therefore, as can be seen from the characteristic diagram of FIG. 3 showing the relationship between the power supply voltage of the drive power supply device (not shown) and the drive time of the print head for ensuring the desired printing power in this embodiment, the power supply voltage is NA of Fig. 1 even if it becomes lower
The drive time does not exceed the time T set by the ND monostable multivibrator 6.
（発明の効果） 以上説明したように、本発明によれば、駆動用電源装置
の電源電圧が大幅に低下したときのプリントヘッドの駆
動時間の伸長を印字力の許容範囲で一定値以内と制限し
たことにより、電源装置の小型化と同時に印字動作の高
速化を図れるインパクトプリンタを提供できる。(Effect of the Invention) As described above, according to the present invention, the extension of the driving time of the print head when the power supply voltage of the driving power supply device is significantly reduced is limited to a certain value within the allowable range of the printing power. As a result, it is possible to provide an impact printer that can speed up the printing operation while reducing the size of the power supply device.
第１図は本発明の一実施例を示す回路図、第２図は第１
図の回路における各測定点の信号波形を示すタイムチャ
ート、第３図は本実施例のプリントヘッドの駆動時間と
駆動用電源装置の電源電圧との関係を示す特性図、第４
図はインパクトプリンタの構成を示すブロック図、第５
図は従来例のプリントヘッドの駆動時間と駆動用電源装
置の電源電圧との関係を示す特性図である。 １……入力端子、２……トライステート回路、 ３……抵抗、４……コンデンサ、 ５……コンパレータ、 ６……NAND単安定マルチバイブレータ、 41……電源回路、42……制御回路、 43……プリントヘッド駆動回路、 44……プリントヘッド。FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG.
FIG. 4 is a time chart showing the signal waveform at each measurement point in the circuit of the figure, FIG. 3 is a characteristic diagram showing the relationship between the drive time of the print head of this embodiment and the power supply voltage of the drive power supply device,
FIG. 5 is a block diagram showing the configuration of an impact printer, fifth.
The figure is a characteristic diagram showing the relationship between the drive time of the conventional print head and the power supply voltage of the drive power supply device. 1 ... input terminal, 2 ... tristate circuit, 3 ... resistor, 4 ... capacitor, 5 ... comparator, 6 ... NAND monostable multivibrator, 41 ... power supply circuit, 42 ... control circuit, 43 …… Print head drive circuit, 44 …… Print head.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 9/38 Ａ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location 9/38 A
Claims (1)
あるいは電磁的に圧することによって印字するプリント
ヘッドと、 該プリントヘッドに駆動電力を供給する駆動回路と、 電源電圧を監視して印字に必要な駆動電力を確保する駆
動時間を設定する制御回路とを具備するインパクトプリ
ンタにおいて、 前記制御回路に、前記電源電圧が所定値より低下しても
前記駆動時間を予め設定した所定の限界値とする手段を
設けたことを特徴とするインパクトプリンタ。1. A print head that prints by mechanically or electromagnetically pressing characters or dots on a print medium, a drive circuit that supplies drive power to the print head, and a power supply voltage is monitored to perform printing. In an impact printer including a control circuit that sets a drive time for securing a necessary drive power, the control circuit may set a predetermined limit value for the drive time even if the power supply voltage is lower than a predetermined value. An impact printer characterized in that it is provided with a means for performing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61243088A JPH0747315B2 (en) | 1986-10-15 | 1986-10-15 | Impact printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61243088A JPH0747315B2 (en) | 1986-10-15 | 1986-10-15 | Impact printer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6398446A JPS6398446A (en) | 1988-04-28 |
| JPH0747315B2 true JPH0747315B2 (en) | 1995-05-24 |
Family
ID=17098605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61243088A Expired - Lifetime JPH0747315B2 (en) | 1986-10-15 | 1986-10-15 | Impact printer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0747315B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2738786B2 (en) * | 1991-10-25 | 1998-04-08 | 沖電気工業株式会社 | Drive device for wire dot head |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59156759A (en) * | 1983-02-25 | 1984-09-06 | Canon Inc | Drive control apparatus of wire-dot printer |
-
1986
- 1986-10-15 JP JP61243088A patent/JPH0747315B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59156759A (en) * | 1983-02-25 | 1984-09-06 | Canon Inc | Drive control apparatus of wire-dot printer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6398446A (en) | 1988-04-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |