JPS6314405Y2 - - Google Patents
Info
- Publication number
- JPS6314405Y2 JPS6314405Y2 JP1982045724U JP4572482U JPS6314405Y2 JP S6314405 Y2 JPS6314405 Y2 JP S6314405Y2 JP 1982045724 U JP1982045724 U JP 1982045724U JP 4572482 U JP4572482 U JP 4572482U JP S6314405 Y2 JPS6314405 Y2 JP S6314405Y2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- magnet
- current
- coils
- switch circuit
- 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
Links
- 238000001514 detection method Methods 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 230000005856 abnormality Effects 0.000 claims 1
- 230000007257 malfunction Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
Landscapes
- Dot-Matrix Printers And Others (AREA)
- Debugging And Monitoring (AREA)
Description
【考案の詳細な説明】
〈分野〉
本考案は、ワイヤドツトプリンタのワイヤ駆動
回路等に採用され得る電磁駆動装置に関し、特
に、駆動回路の動作が検出できる電磁駆動装置の
動作検出回路に関する。[Detailed Description of the Invention] <Field> The present invention relates to an electromagnetic drive device that can be employed in a wire drive circuit of a wire dot printer, and more particularly to an operation detection circuit for an electromagnetic drive device that can detect the operation of the drive circuit.
〈従来技術〉
複数の電磁石が駆動される装置として、各々の
電磁石によつて作動される複数のアーマチユアの
先端にドツトを印字するためのワイヤが取付けら
れたワイヤドツト式プリントヘツドが知られてい
る。<Prior Art> As a device driven by a plurality of electromagnets, a wire dot type print head is known, in which a wire for printing dots is attached to the tip of a plurality of armatures operated by each electromagnet.
こうしたワイヤドツト式プリントヘツドを駆動
する駆動回路においては、通常駆動回路の誤動
作、駆動素子の不良、短絡、等による災害を防止
するために所定の動作をしたか否か検出する動作
検出回路が設けられている。 In the drive circuits for driving such wired printheads, an operation detection circuit is usually provided which detects whether a predetermined operation has been performed in order to prevent disasters due to malfunction of the drive circuit, defects or short circuits in the drive elements, etc.
第１図は、従来の電磁駆動装置の回路図であ
る。図中、d1〜doはドライバ、C1〜Coは電磁石を
作動させるためのコイル、Ｅは電源、OPはオペ
アンプである。 FIG. 1 is a circuit diagram of a conventional electromagnetic drive device. In the figure, d 1 to d o are drivers, C 1 to Co are coils for operating the electromagnets, E is a power supply, and OP is an operational amplifier.
こうした回路においては各コイルC1〜Coに対
応して、ドライバd1〜doが設けられて成り印字す
るべく選択されたドライバ、di、が動作状態にお
かれることにより、コイルdiに電流を流し、電磁
石を作動する。 In such a circuit, drivers d 1 to d o are provided corresponding to each coil C 1 to C o , and when the driver di selected for printing is put into operation, a current is applied to the coil di. flows and activates the electromagnet.
一方、オペアンプOPの基準電圧入力端側には、
電源Ｅの電圧を抵抗分割して電圧が入力されてお
り、オペアンプOPは、各ドライバの端子電圧を
検出し、これを基準電圧とを比較して、駆動中か
否かを判定し、正誤を判断する様にしている。 On the other hand, on the reference voltage input side of the operational amplifier OP,
The voltage is input by dividing the voltage of the power supply E by resistance, and the operational amplifier OP detects the terminal voltage of each driver, compares it with the reference voltage, determines whether it is driving or not, and determines whether it is correct or incorrect. I try to judge.
しかしながらこうした従来の回路であると、マ
グネツト自体がインピーダンスＺを持つて短絡し
た場合、或はドライバであるトランジスタがON
状態を継続し続けて、大電流が流れドライバトラ
ンジスタdiの係数hFEが低下し、これによりコレ
クタエミツタ間電圧が増加した場合には何れもコ
レクタ電圧が高くなり、誤動作検出ができない欠
点を有している。 However, with these conventional circuits, if the magnet itself has an impedance Z and is short-circuited, or the driver transistor turns on.
If the condition continues, a large current flows, the coefficient h FE of the driver transistor di decreases, and the voltage between the collector and emitter increases as a result, the collector voltage increases and there is a drawback that malfunction cannot be detected. are doing.
〈目的〉
本考案の目的は、以上の従来の欠点を取除き、
電流の流路が発生した場合、これを検出し得る電
磁駆動装置の動作検出回路を提供することにあ
る。<Purpose> The purpose of the present invention is to eliminate the above-mentioned conventional drawbacks,
An object of the present invention is to provide an operation detection circuit for an electromagnetic drive device that can detect a current flow path when it occurs.
〈要点〉
本考案においては、上記目的を達成するために
電流検出回路を設け、これにより動作検出を行う
様にしたものである。<Main Points> In the present invention, in order to achieve the above object, a current detection circuit is provided, and the operation is detected using the current detection circuit.
〈実施例〉
第２図は、本考案の一実施例の回路図である。
図中、第１図に示したものと同じものは同一記号
が付して示される。<Embodiment> FIG. 2 is a circuit diagram of an embodiment of the present invention.
In the figure, the same parts as shown in FIG. 1 are designated with the same symbols.
またCDは電流検出部、LCはレベル変換部、
Trは電流検出トランジスタである。 Also, CD is the current detection section, LC is the level conversion section,
Tr is a current detection transistor.
同図において、各ドライバd1〜doが非動作状態
にある時（但し、短絡等生じていない時）には、
トランジスタTrは動作せず、従つて、レベル変
換回路LCの電源VCCが検出回路CDの出力端子に
現出する。 In the same figure, when each driver d 1 to d o is in a non-operating state (provided that no short circuit etc. has occurred),
The transistor Tr does not operate, and therefore, the power supply VCC of the level conversion circuit LC appears at the output terminal of the detection circuit CD.
一方ドライバd1〜doを動作状態におく場合、或
は何らかの原因によつて、コイルに電流が流れる
場合、検出回路CDから、即ち、トランジスタTr
からベース電流ｉが流れ、トランジスタTrはON
状態となる。これにより、レベル変換回路LC内
のトランジスタのベース電圧は高レベルとなり、
検出回路CDの出力端子には接地電圧が現出する。 On the other hand, when the drivers d 1 to d o are put into operation, or when current flows through the coils for some reason, the detection circuit CD, that is, the transistor Tr
The base current i flows from , and the transistor Tr is turned on.
state. As a result, the base voltage of the transistor in the level conversion circuit LC becomes high level,
A ground voltage appears at the output terminal of the detection circuit CD.
この検出信号により、タイマ（図示されない）
で、所定時間以上、接地電圧となつている事を検
出し、或は、ドライバd1〜doを駆動しない非駆動
タイミング中に接地レベルとなつている事を比較
回路で検出して、誤動作を判定する。 This detection signal causes a timer (not shown) to
If the comparison circuit detects that the voltage has been at the ground voltage for a predetermined time or longer, or that the voltage has been at the ground level during the non-drive timing when the drivers d 1 to d o are not driven, the malfunction will occur. Determine.
尚、レベル変換回路LCは、第２図図示の回路
を使用しても良いが、公知のコンパレータを用い
ても良い。 Note that the level conversion circuit LC may use the circuit shown in FIG. 2, but may also use a known comparator.
〈効果〉
以上記載した様に本考案によれば、動作状態を
確実に検出できる動作検出回路が得られる。<Effects> As described above, according to the present invention, an operation detection circuit that can reliably detect the operation state can be obtained.
第１図は従来の電磁駆動装置の動作検出回路、
第２図は本考案の一実施例の回路を示す。
図中、d1〜doはドライバ、C1〜Coはコイル、
CDは電流検出回路、LCはレベル変換回路であ
る。
Figure 1 shows the operation detection circuit of a conventional electromagnetic drive device.
FIG. 2 shows a circuit of an embodiment of the present invention. In the figure, d 1 to d o are drivers, C 1 to Co are coils,
CD is a current detection circuit, and LC is a level conversion circuit.
Claims (1)
Coと、 該各コイルとアース間にあり、電源Ｅからの電
流をコイルに断続的に供給する複数のスイツチ回
路d1〜doとを有し、 各スイツチ回路を選択的に開閉して、対応する
マグネツトのコイルに電流を供給する電磁駆動装
置において、 各マグネツトのコイルとスイツチ回路との接続
点および前記共通電源間に設けられ、 少なくとも一つのマグネツトに電流が流れた時
に、前記接続点に電源から電流を供給する唯一つ
のスイツチ回路Trと、 該スイツチ回路Trを介して前記接続点に流れ
る電流を増幅するレベル変換回路LCとよりなり、 該レベル変換回路からの検出信号によりマグネ
ツトの異常動作を検出することを特徴とする電磁
駆動装置の動作検出回路。[Scope of claims for utility model registration] A plurality of coils C 1 to constitute an electromagnetic magnet
C o , and a plurality of switch circuits d 1 to d o that are located between each coil and the ground and intermittently supply current from the power source E to the coils, and each switch circuit is selectively opened and closed. , in an electromagnetic drive device that supplies current to the coils of the corresponding magnets, is provided between the connection point between the coil of each magnet and the switch circuit and the common power supply, and when current flows through at least one magnet, the connection point It consists of a single switch circuit Tr that supplies current from the power supply to the magnet, and a level conversion circuit LC that amplifies the current flowing to the connection point via the switch circuit Tr.The detection signal from the level conversion circuit detects abnormalities in the magnet. A motion detection circuit for an electromagnetic drive device characterized by detecting motion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4572482U JPS58150156U (en) | 1982-03-31 | 1982-03-31 | Electromagnetic drive device motion detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4572482U JPS58150156U (en) | 1982-03-31 | 1982-03-31 | Electromagnetic drive device motion detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58150156U JPS58150156U (en) | 1983-10-07 |
| JPS6314405Y2 true JPS6314405Y2 (en) | 1988-04-22 |
Family
ID=30056734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4572482U Granted JPS58150156U (en) | 1982-03-31 | 1982-03-31 | Electromagnetic drive device motion detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58150156U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2998436B2 (en) * | 1992-07-31 | 2000-01-11 | 富士通株式会社 | Impact printer |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5472457A (en) * | 1977-11-21 | 1979-06-09 | Suwa Seikosha Kk | Magnet drive circuit |
-
1982
- 1982-03-31 JP JP4572482U patent/JPS58150156U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5472457A (en) * | 1977-11-21 | 1979-06-09 | Suwa Seikosha Kk | Magnet drive circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58150156U (en) | 1983-10-07 |
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