JP3143594B2 - Electrostatic printing device - Google Patents
Electrostatic printing deviceInfo
- Publication number
- JP3143594B2 JP3143594B2 JP29962296A JP29962296A JP3143594B2 JP 3143594 B2 JP3143594 B2 JP 3143594B2 JP 29962296 A JP29962296 A JP 29962296A JP 29962296 A JP29962296 A JP 29962296A JP 3143594 B2 JP3143594 B2 JP 3143594B2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- band
- exposed
- holder
- electrostatic printing
- 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 - Fee Related
Links
Landscapes
- Accessory Devices And Overall Control Thereof (AREA)
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、静電印刷装置に関
する。[0001] The present invention relates to an electrostatic printing apparatus.
【０００２】[0002]
【従来の技術】静電気によりインクを転写するようにし
た静電印刷装置では、帯状の紙を金属製の版胴に押し付
けるための圧胴を帯電極にて帯電させることにより、紙
の版胴への吸着と版胴セル（版胴の表面凹所）内のイン
クの帯電による盛り上がりが生じて、インクが紙にスム
ースに転写される。このような静電印刷装置では、次の
ａ〜ｃのような重大な事故を回避する必要があった。2. Description of the Related Art In an electrostatic printing apparatus in which ink is transferred by static electricity, an impression cylinder for pressing a band-shaped paper against a metal plate cylinder is charged by a band electrode, so that the ink is transferred to the paper plate cylinder. And the ink in the plate cylinder cells (surface recesses of the plate cylinder) is charged, causing swelling, and the ink is smoothly transferred to the paper. In such an electrostatic printing apparatus, it is necessary to avoid serious accidents such as the following a to c.
【０００３】ａ．圧胴の電位の上昇（圧胴表面抵抗の増
大による電位差の上昇、または、圧胴が版胴と接触せず
印刷可能位置にない場合に圧胴に電荷が蓄積されて電位
が上昇）による帯電電流の減少と、静電印刷装置として
絶対に回避しなければならない圧胴からの火花放電の発
生。 ｂ．圧胴の電位の下降（圧胴表面抵抗の減少）により帯
電電流が増大して、絶対に回避しなければならない過電
流による爆発性インクの蒸気への引火。 ｃ．帯電極表面の導電性カーボン系による汚れによって
流れる帯電極からの漏洩電流のジュール熱による爆発性
インクの蒸気への引火。A. Charge due to an increase in the potential of the impression cylinder (increase in potential difference due to an increase in the surface resistance of the impression cylinder, or accumulation of electric charge in the impression cylinder when the impression cylinder is not in contact with the plate cylinder and not at a printable position). The reduction of the current and the generation of spark discharges from the impression cylinder which must be avoided as an electrostatic printing device. b. The charging current increases due to a decrease in the potential of the impression cylinder (reduction of the surface resistance of the impression cylinder). c. The explosive ink vapor is ignited by Joule heat of the leakage current flowing from the electrode strip due to contamination of the electrode surface with the conductive carbon.
【０００４】従来の静電印刷装置としては、上述のａ〜
ｃのような事故を回避するために、帯電極への出力電圧
に対する帯電電流を計測して、その帯電電流が増加また
は減少して所定の安全領域から外れたときに、警報を発
するように構成したものが公知であった。また、インク
の転写をさらにスムースとするための除電極を設けた静
電印刷装置が公知であった。[0004] As a conventional electrostatic printing apparatus, the above-mentioned a to
In order to avoid such an accident as in c, the charging current with respect to the output voltage to the band electrode is measured, and an alarm is issued when the charging current increases or decreases and deviates from a predetermined safe area. What was done was known. In addition, an electrostatic printing apparatus provided with a removal electrode for further smoothing the transfer of ink has been known.
【０００５】[0005]
【発明が解決しようとする課題】しかし、上述の帯電電
流の計測によるものでは、帯電電流が増加した場合、そ
れが帯電極の表面の汚れによる漏洩電流の増加によるも
のなのか、あるいは、他の原因によるものなのかを判別
するためには、帯電極を目視により確認するほかなかっ
た。However, according to the above-described measurement of the charging current, if the charging current increases, it is determined whether the increase is due to an increase in leakage current due to contamination of the surface of the band electrode, or other factors. The only way to determine whether this was due to the cause was to visually check the strip electrodes.
【０００６】そこで、本発明は、上述の問題を解決し
て、帯電極又は除電極の汚れを、目視によらずに自動的
かつ正確に検出でき、事故や故障の発生を確実に回避で
きる静電印刷装置を提供することを目的とする。Therefore, the present invention solves the above-mentioned problems, and can automatically and accurately detect dirt on a strip electrode or a removal electrode without visual observation, and can reliably avoid occurrence of accidents and failures. An object of the present invention is to provide an electroprinting apparatus.
【０００７】[0007]
【課題を解決するための手段】上述の目的を達成するた
めに本発明に係る静電印刷装置は、版胴の表面に静電荷
を帯電させるための帯電極を有する静電印刷装置であっ
て、上記帯電極と、該帯電極を先端部が外面に露出する
ように保持する絶縁体製の電極保持体と、上記帯電極か
ら離れた位置にて先端部が外面に露出するように上記電
極保持体に埋め込まれる汚れ検知電極と、を有する帯電
ユニットを備え、さらに、該帯電ユニットの上記電極保
持体の外面にて上記帯電極と汚れ検知電極との間を流れ
る表面リーク電流を検出する電極汚れ検出回路を、設け
たものである。In order to achieve the above-mentioned object, an electrostatic printing apparatus according to the present invention is an electrostatic printing apparatus having a band electrode for charging a surface of a plate cylinder with an electrostatic charge. An electrode holder made of an insulator for holding the band electrode so that the tip is exposed to the outer surface, and the electrode having a tip exposed to the outer surface at a position away from the band electrode. An electrode for detecting a surface leakage current flowing between the band electrode and the stain detection electrode on the outer surface of the electrode holder of the charging unit. A dirt detection circuit is provided.
【０００８】また、被印刷物を除電するための除電極を
有する静電印刷装置であって、上記除電極と、該除電極
を先端部が外面に露出するように保持する絶縁体製の電
極保持体と、上記除電極から離れた位置にて先端部が外
面に露出するように上記電極保持体に埋め込まれる汚れ
検知電極と、を有する除電ユニットを備え、さらに、該
除電ユニットの上記電極保持体の外面にて上記除電極と
汚れ検知電極との間を流れる表面リーク電流を検出する
電極汚れ検出回路を、設けたものである。[0008] An electrostatic printing apparatus having an electrode for removing electricity from an object to be printed, comprising: an electrode holder made of an insulator for holding the electrode and an exposing end of the electrode to be exposed to an outer surface. And a dirt detection electrode embedded in the electrode holder so that a tip portion is exposed to an outer surface at a position away from the electrode, further comprising: a dirt detection electrode, further comprising: an electrode holder of the charge eliminating unit. An electrode contamination detection circuit for detecting a surface leak current flowing between the removal electrode and the contamination detection electrode on the outer surface of the electrode.
【０００９】また、版胴の表面に静電荷を帯電させるた
めの帯電極と被印刷物を除電するための除電極を有する
静電印刷装置であって、上記帯電極と、該帯電極を先端
部が外面に露出するように保持する絶縁体製の電極保持
体と、上記帯電極から離れた位置にて先端部が外面に露
出するように上記電極保持体に埋め込まれる汚れ検知電
極と、を有する帯電ユニットを備え、かつ、上記除電極
と、該除電極を先端部が外面に露出するように保持する
絶縁体製の電極保持体と、上記除電極から離れた位置に
て先端部が外面に露出するように上記電極保持体に埋め
込まれる汚れ検知電極と、を有する除電ユニットを備
え、さらに、上記帯電ユニット及び除電ユニットの上記
電極保持体の外面にて上記帯電極と汚れ検知電極との間
を流れる表面リーク電流、及び、除電極と汚れ検知電極
との間を流れる表面リーク電流を、検出する電極汚れ検
出回路を、設けたものである。An electrostatic printing apparatus having a band electrode for charging a surface of a plate cylinder with an electrostatic charge and a discharging electrode for discharging an object to be printed is provided. An electrode holder made of an insulator that holds the electrode so as to be exposed to the outer surface, and a dirt detection electrode that is embedded in the electrode holder so that the tip end is exposed to the outer surface at a position away from the band electrode. A charging unit is provided, and the removing electrode, an electrode holder made of an insulator that holds the removing electrode so that the tip is exposed to the outer surface, and a tip located on the outer surface at a position away from the removing electrode. A dirt detection electrode embedded in the electrode holder so as to be exposed, and further comprising a charge elimination unit having: an outer surface of the electrode holder of the charging unit and the charge elimination unit between the band electrode and the dirt detection electrode. Flowing surface leak Flow, and, the surface leakage current flowing between the discharging electrode and the dirt sensing electrode, the electrode contamination detection circuit for detecting, those provided.
【００１０】なお、電極汚れ検出回路にて検出した表面
リーク電流が所定安全領域から外れると警報を発する警
報発生手段が、設けられているのが好ましい。It is preferable that an alarm generating means for issuing an alarm when the surface leak current detected by the electrode contamination detecting circuit deviates from a predetermined safe area is provided.
【００１１】[0011]
【発明の実施の形態】以下、図示の実施の形態に基き本
発明を詳説する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on the illustrated embodiments.
【００１２】図６は、本発明に係る静電印刷装置の実施
の一形態に於ける簡略図を示し、この静電印刷装置は、
複数の（図例では４つの）印刷部１…と、各印刷部１…
の印刷の制御をする制御手段２と、を備える。FIG. 6 is a simplified view of an embodiment of an electrostatic printing apparatus according to the present invention.
A plurality (four in the illustrated example) of printing units 1 and each printing unit 1.
And control means 2 for controlling the printing of.
【００１３】印刷部１は、図６と図７に示すように、版
胴３と、インク浴４と、版胴３に被印刷物６を押し付け
る圧胴５と、帯電ユニット８と、除電ユニット９, ９
と、その帯電ユニット８と除電ユニット９, ９に電気的
に接続される電源装置７…と、を備える。As shown in FIGS. 6 and 7, the printing unit 1 includes a plate cylinder 3, an ink bath 4, an impression cylinder 5 for pressing a printing material 6 against the plate cylinder 3, a charging unit 8, and a charge removing unit 9. , 9
And a power supply device 7 electrically connected to the charging unit 8 and the charge removing units 9, 9.
【００１４】版胴３は、印刷されるべき型に対応する凹
所（版胴セル）を外周面に有し、その凹所にインク浴４
からインクが供給される。被印刷物６は、供給ローラ30
から巻取ローラ31側へと矢印Ａ方向に送られ、圧胴５と
版胴３の間を走行する。The plate cylinder 3 has a recess (plate cylinder cell) corresponding to the type to be printed on the outer peripheral surface, and the recess has an ink bath 4.
Supplies ink. The printing material 6 is supplied by a supply roller 30.
From the roller to the take-up roller 31 side in the direction of arrow A, and travels between the impression cylinder 5 and the plate cylinder 3.
【００１５】帯電ユニット８は、圧胴５と被印刷物６
（この場合は帯状の紙）を介して版胴３の凹所に貯えら
れたインクをマイナス帯電させる。これにより、インク
分子はマイナス帯電して分子同士が反発しあい、被印刷
物６側に盛り上がって、インクが被印刷物６に転写され
る。また、圧胴５の上流側と下流側に設けられた除電ユ
ニット９，９は、版胴３のインクが確実に帯電するよう
に、被印刷物６の電位を整える。The charging unit 8 includes an impression cylinder 5 and a printing material 6.
The ink stored in the concave portion of the plate cylinder 3 is negatively charged via (in this case, a band-shaped paper). As a result, the ink molecules are negatively charged, and the molecules repel each other, so that the ink molecules are swelled toward the printing substrate 6 and the ink is transferred to the printing substrate 6. In addition, the static elimination units 9 and 9 provided on the upstream side and the downstream side of the impression cylinder 5 adjust the potential of the printing material 6 so that the ink of the plate cylinder 3 is charged reliably.
【００１６】上述の４つの電源装置７ａ，７ｂ，７ｃ，
７ｄは、一本のシリアル通信回線11にて、制御手段２に
接続される。また、各印刷部１…のインク浴４…には、
相互に異なる色（例えば赤、青、黄、黒色等）のインク
が収容される。そして、制御手段２からの命令信号によ
り、各電源装置７ａ，７ｂ，７ｃ，７ｄが独立して制御
され、印刷が行われる。The above four power supplies 7a, 7b, 7c,
7d is connected to the control means 2 by one serial communication line 11. In addition, the ink baths 4 of each printing unit 1 include:
Inks of different colors (for example, red, blue, yellow, black, etc.) are stored. The power supply devices 7a, 7b, 7c, 7d are independently controlled by a command signal from the control means 2, and printing is performed.
【００１７】しかして、図１と図２に示すように、帯電
ユニット８は、帯電極12…と、その帯電極12…を先端部
が外面に露出するように保持する絶縁体製の電極保持体
14と、帯電極12…から離れた位置にて先端部が外面に露
出するように電極保持体14に埋め込まれる汚れ検知電極
15…と、を有する。帯電極12は、版胴３の表面に静電荷
を帯電させるためのものである。Thus, as shown in FIGS. 1 and 2, the charging unit 8 includes a band electrode 12 and an electrode holder made of an insulator for holding the band electrode 12 so that the tip end is exposed to the outer surface. body
14 and a dirt detection electrode embedded in the electrode holder 14 so that the tip is exposed to the outside at a position away from the band electrodes 12.
15 ... The band electrode 12 charges the surface of the plate cylinder 3 with an electrostatic charge.
【００１８】帯電ユニット８の電極保持体14は、角柱状
の内部材18と、その内部材18に外嵌される外部材19と、
から成り、複数本の針状の帯電極12…と汚れ検知電極15
…とが内部材18に埋入される。電極保持体14の材質とし
ては、例えばエポキシ系樹脂があげられる。汚れ検知電
極15には、帯板状の汚れ検知電極15ａと針状の汚れ検知
電極15ｂとの２種類があり、内部材18の外面16側から見
て幅方向一端部近傍に帯板状の汚れ検知電極15ａが電極
保持体14の長手方向に平行に配設され、かつ、幅方向他
端部近傍に針状の汚れ検知電極15ｂ…が電極保持体14の
長手方向に所定ピッチにて配設される。さらに、内部材
18の幅方向中間部に、針状の帯電極12…が電極保持体14
の長手方向に所定ピッチにて配設される。汚れ検知電極
15の種類を、帯板状の汚れ検知電極15ａと針状の汚れ検
知電極15ｂとの何れか一方のみとしてもよい。The electrode holder 14 of the charging unit 8 includes a prismatic inner member 18, an outer member 19 fitted on the inner member 18,
And a plurality of needle-shaped strip electrodes 12 and a dirt detection electrode 15.
Are embedded in the inner member 18. Examples of the material of the electrode holder 14 include an epoxy resin. There are two types of dirt detection electrodes 15, a strip-shaped dirt detection electrode 15a and a needle-shaped dirt detection electrode 15b. The stain detection electrodes 15a are arranged in parallel with the longitudinal direction of the electrode holder 14, and needle-like stain detection electrodes 15b are arranged at a predetermined pitch in the longitudinal direction of the electrode holder 14 near the other end in the width direction. Is established. Furthermore, the inner member
In the widthwise middle portion of 18, a needle-shaped strip electrode 12 is provided with an electrode holder 14.
Are arranged at a predetermined pitch in the longitudinal direction. Dirt detection electrode
The 15 types may be only one of the strip-shaped dirt detection electrode 15a and the needle-shaped dirt detection electrode 15b.
【００１９】また、除電ユニット９は、上記帯電ユニッ
ト８と同様の構造とされる。即ち、除電ユニット９は、
除電極13と、その除電極13を先端部が外面に露出するよ
うに保持する絶縁体製の電極保持体14と、除電極13から
離れた位置にて先端部が外面に露出するように上記電極
保持体14に埋め込まれる汚れ検知電極15と、を有する。The charge removing unit 9 has the same structure as the charging unit 8 described above. That is, the static elimination unit 9
The removal electrode 13, an electrode holder 14 made of an insulator that holds the removal electrode 13 so that the tip portion is exposed to the outer surface, and the above-described configuration in which the tip portion is exposed to the exterior surface at a position away from the removal electrode 13. And a dirt detection electrode 15 embedded in the electrode holder 14.
【００２０】しかして、図３に示すように、帯電ユニッ
ト８又は除電ユニット９を含む電極汚れ警報システム20
を構成する。その警報システム20は、帯電ユニット８又
は除電ユニット９と、帯電極12又は除電極13に高電圧を
印加する高電圧発生手段21と、帯電ユニット８又は除電
ユニット９の汚れを検出する電極汚れ検出回路17と、電
極汚れ検出回路17にて検出した表面リーク電流Ｉが所定
安全領域から外れると警報を発する警報発生手段22と、
インターロックリレー29と、を備える。23は一次電源で
ある。警報発生手段22は、ブザー24と、パトライト25
と、電極汚れ検出回路17からの命令信号を受けてブザー
24とパトライト25を作動させる警報回路26と、を有す
る。Thus, as shown in FIG. 3, the electrode contamination alarm system 20 including the charging unit 8 or the static elimination unit 9 is used.
Is configured. The alarm system 20 includes a charging unit 8 or a static elimination unit 9, a high voltage generating means 21 for applying a high voltage to the band electrode 12 or the static elimination electrode 13, and an electrode contamination detection for detecting contamination of the charging unit 8 or the static elimination unit 9. A circuit 17, an alarm generating means 22 for issuing an alarm when the surface leak current I detected by the electrode contamination detection circuit 17 is out of a predetermined safe area,
And an interlock relay 29. 23 is a primary power supply. The alarm generating means 22 includes a buzzer 24 and a patrol light 25.
And a buzzer upon receiving a command signal from the electrode contamination detection circuit 17.
24 and an alarm circuit 26 for activating the patrol light 25.
【００２１】また、図４に略示するように、帯電ユニッ
ト８の電極保持体14の外面にて帯電極12又は除電極13と
汚れ検知電極15との間を流れる表面リーク電流Ｉを検出
するように構成する。即ち、帯電ユニット８の電極保持
体14の外面にて帯電極12又は除電極13と汚れ検知電極15
との間を流れる表面リーク電流Ｉを検出する電極汚れ検
出回路17を、設ける。As shown schematically in FIG. 4, a surface leak current I flowing between the band electrode 12 or the removal electrode 13 and the stain detection electrode 15 is detected on the outer surface of the electrode holder 14 of the charging unit 8. The configuration is as follows. That is, on the outer surface of the electrode holder 14 of the charging unit 8, the band electrode 12 or the removal electrode 13 and the stain detection electrode 15
And an electrode contamination detection circuit 17 for detecting a surface leak current I flowing between the electrodes.
【００２２】その原理と作用を説明すると、帯電ユニッ
ト８の電極保持体14は絶縁性を有するので、電極保持体
14の外面に汚れがないときは、帯電極12又は除電極13と
汚れ検知電極15との間には電流が流れない。これに対
し、電極保持体14の外面に塵等が付着して汚れると、
（−20ｋＶ程度の電圧が印加される）帯電極12又は除電
極13と汚れ検知電極15との間に、表面リーク電流Ｉが流
れる程度の電気抵抗Ｒが生じる。そして、汚れがひどく
なるほど、電気抵抗Ｒが小さくなり、それに反比例して
表面リーク電流Ｉが大きくなる。The principle and operation will be described. Since the electrode holder 14 of the charging unit 8 has an insulating property, the electrode holder 14 has an insulating property.
When there is no stain on the outer surface of 14, no current flows between the strip electrode 12 or the removal electrode 13 and the stain detection electrode 15. On the other hand, if dust or the like adheres to the outer surface of the electrode holder 14 and becomes dirty,
An electric resistance R is generated between the band electrode 12 or the removal electrode 13 (to which a voltage of about -20 kV is applied) and the stain detection electrode 15 such that the surface leak current I flows. Then, as the dirt gets worse, the electric resistance R decreases, and the surface leak current I increases in inverse proportion thereto.
【００２３】しかして、電極汚れ検出回路17は、その表
面リーク電流Ｉを検出する。即ち、図５に示すように、
電極汚れ検出回路17は、直列に接続される第１・第２抵
抗Ｒ1 ，Ｒ2 と、第２抵抗Ｒ2 に並列接続されるダイオ
ード27及びアンプ28と、を有し、微量の表面リーク電流
Ｉを検出できると共に、その表面リーク電流Ｉが予め設
定された所定安全領域から外れる───即ち表面リーク
電流Ｉが所定安全領域を越える───と、警報発生手段
22に警報を発すべき命令信号を送り、警報発生手段22か
ら警報が音や光の形で発せられる。Thus, the electrode contamination detection circuit 17 detects the surface leakage current I. That is, as shown in FIG.
The electrode contamination detection circuit 17 has first and second resistors R 1 and R 2 connected in series, and a diode 27 and an amplifier 28 connected in parallel to the second resistor R 2 , and has a small amount of surface leakage. When the current I can be detected, and the surface leak current I deviates from a predetermined safety region set in advance {that is, when the surface leak current I exceeds the predetermined safety region}, an alarm generating means
A command signal for generating an alarm is sent to the alarm 22 and an alarm is issued from the alarm generating means 22 in the form of sound or light.
【００２４】なお、帯電ユニット８（帯電極12）と除電
ユニット９（除電極13）について、別々の独立した電極
汚れ警報システム20が形成される。これにより、どの帯
電ユニット８又は除電ユニット９が汚れているのかを容
易に判別できる。A separate and independent electrode contamination alarm system 20 is formed for the charging unit 8 (band electrode 12) and the static elimination unit 9 (electrode 13). This makes it easy to determine which charging unit 8 or static elimination unit 9 is dirty.
【００２５】しかして、この静電印刷装置によれば、汚
れによる表面リーク電流Ｉは、それ以外の放電条件（室
温、湿度、気圧等）に左右されないので、帯電ユニット
８（帯電極12）と除電ユニット９（除電極13）の汚れを
自動的かつ確実に検出できる。さらに、帯電ユニット８
（帯電極12）と除電ユニット９（除電極13）を目視しな
くても、どの電極が汚れているのかを正確に判別でき
る。従って、メンテナンスが容易となり、かつ、誤って
電極が汚れたまま使用し続けてしまうことが無い。これ
により、装置の故障、印刷不良、火花放電の発生、爆発
性インクの蒸気への引火等を防止できる。According to this electrostatic printing apparatus, however, the surface leakage current I due to dirt is not affected by other discharge conditions (room temperature, humidity, atmospheric pressure, etc.). Dirt on the static elimination unit 9 (electrode 13) can be automatically and reliably detected. Further, the charging unit 8
It is possible to accurately determine which electrode is dirty without visually observing the (band electrode 12) and the static elimination unit 9 (electrode 13). Therefore, maintenance becomes easy, and there is no possibility that the electrode is continuously used while being dirty by mistake. As a result, it is possible to prevent failure of the apparatus, poor printing, generation of spark discharge, ignition of explosive ink to vapor, and the like.
【００２６】なお、電極汚れ検出回路17に、表面リーク
電流の値を記憶する記憶手段を接続して、表面リーク電
流の変化の履歴を時系列で記憶するように構成するも好
ましい。また、警報発生手段22に記憶手段を接続し、警
報が発せられた時刻の履歴を残すように構成するも望ま
しい。また、電極汚れ検出回路17にて検出した表面リー
ク電流Ｉが所定安全領域から外れると、自動的に電源が
切れるように構成するも好ましい。It is also preferable to connect a storage means for storing the value of the surface leak current to the electrode contamination detecting circuit 17 so as to store the history of the change of the surface leak current in time series. It is also desirable to connect a storage unit to the alarm generation unit 22 so as to leave a history of the time at which the alarm was generated. Further, it is also preferable that the power is automatically turned off when the surface leak current I detected by the electrode contamination detection circuit 17 is out of the predetermined safe area.
【００２７】[0027]
【発明の効果】本発明は上述の構成により、次のような
著大な効果を奏する。The present invention has the following remarkable effects by the above-mentioned structure.
【００２８】請求項１記載の静電印刷装置によれば、帯
電ユニット８（帯電極12）の汚れを、表面リーク電流Ｉ
の監視により、自動的にかつ正確に検出できる。従っ
て、静電印刷装置の故障、印刷不良、火花放電の発生、
爆発性インクの蒸気への引火等を防止できる。また、汚
れたユニット（帯電ユニット８）を容易かつ確実に特定
でき、メンテナンスや修復に要する時間を短縮できる。According to the electrostatic printing apparatus of the first aspect, the contamination of the charging unit 8 (band electrode 12) is reduced by the surface leakage current I.
Monitoring automatically and accurately. Therefore, failure of the electrostatic printing device, poor printing, occurrence of spark discharge,
It is possible to prevent the explosive ink from igniting the vapor. Further, a dirty unit (charging unit 8) can be easily and reliably specified, and the time required for maintenance and restoration can be reduced.
【００２９】請求項２記載の静電印刷装置によれば、除
電ユニット９（除電極13）の汚れを、表面リーク電流Ｉ
の監視により、自動的にかつ正確に検出できる。従っ
て、静電印刷装置の故障、印刷不良、火花放電の発生、
爆発性インクの蒸気への引火等を防止できる。また、汚
れたユニット（除電ユニット９）を容易かつ確実に特定
でき、メンテナンスや修復に要する時間を短縮できる。According to the second aspect of the present invention, the dirt on the static elimination unit 9 (electrode 13) is removed by the surface leakage current I.
Monitoring automatically and accurately. Therefore, failure of the electrostatic printing device, poor printing, occurrence of spark discharge,
It is possible to prevent the explosive ink from igniting the vapor. Further, a dirty unit (static elimination unit 9) can be easily and reliably specified, and the time required for maintenance and restoration can be reduced.
【００３０】請求項３記載の静電印刷装置によれば、帯
電ユニット８（帯電極12）の汚れ、及び、除電ユニット
９（除電極13）の汚れを、表面リーク電流Ｉの監視によ
り、自動的にかつ正確に検出できる。従って、静電印刷
装置の故障、印刷不良、火花放電の発生、爆発性インク
の蒸気への引火等を防止できる。また、汚れたユニット
を容易かつ確実に特定でき、メンテナンスや修復に要す
る時間を短縮できる。According to the electrostatic printing apparatus of the third aspect, the contamination of the charging unit 8 (band electrode 12) and the contamination of the charge removing unit 9 (removal electrode 13) are automatically monitored by monitoring the surface leak current I. Can be accurately and accurately detected. Accordingly, failure of the electrostatic printing apparatus, poor printing, occurrence of spark discharge, ignition of explosive ink to vapor, and the like can be prevented. In addition, a dirty unit can be easily and reliably specified, and the time required for maintenance and repair can be reduced.
【００３１】請求項４記載の静電印刷装置によれば、請
求項１，２又は３記載のものと同様の効果を奏すると共
に、帯電ユニット８又は除電ユニット９の汚れが許容範
囲を越えると同時に警報を発することができるので、装
置の故障、印刷不良、火花放電の発生、爆発性インクの
蒸気への引火等を、一層確実に防止できる。According to the electrostatic printing apparatus of the fourth aspect, the same effect as that of the first, second, or third aspect is obtained, and the contamination of the charging unit 8 or the static elimination unit 9 exceeds the allowable range. Since an alarm can be issued, failure of the apparatus, poor printing, occurrence of spark discharge, ignition of explosive ink vapor, and the like can be more reliably prevented.
【図１】本発明の実施の一形態の要部拡大断面図であ
る。FIG. 1 is an enlarged sectional view of a main part according to an embodiment of the present invention.
【図２】要部拡大断面図である。FIG. 2 is an enlarged sectional view of a main part.
【図３】電極汚れ警報システムのブロック図である。FIG. 3 is a block diagram of an electrode contamination warning system.
【図４】原理と作用の説明図である。FIG. 4 is an explanatory diagram of the principle and operation.
【図５】原理と作用の説明図である。FIG. 5 is an explanatory diagram of the principle and operation.
【図６】静電印刷装置全体の簡略説明図である。FIG. 6 is a simplified explanatory diagram of the entire electrostatic printing apparatus.
【図７】印刷部の簡略説明図である。FIG. 7 is a simplified explanatory diagram of a printing unit.
３ 版胴 ６ 被印刷物 ８ 帯電ユニット ９ 除電ユニット 12 帯電極 13 除電極 14 電極保持体 15 汚れ検知電極 16 外面 17 電極汚れ検出回路 22 警報発生手段 Ｉ 表面リーク電流 3 Plate cylinder 6 Printed object 8 Charging unit 9 Static elimination unit 12 Band electrode 13 Removal electrode 14 Electrode holder 15 Dirt detection electrode 16 Outer surface 17 Electrode dirt detection circuit 22 Alarm generation means I Surface leak current
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭59−214665（ＪＰ，Ａ) 特開 昭57−129756（ＪＰ，Ａ) 特開 昭54−62827（ＪＰ，Ａ) 特開 昭55−39347（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B41J 2/39 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-214665 (JP, A) JP-A-57-129756 (JP, A) JP-A-54-62827 (JP, A) JP-A 55-129 39347 (JP, A) (58) Field surveyed (Int. Cl. 7 , DB name) B41J 2/39
Claims (4)
の帯電極12を有する静電印刷装置であって、上記帯電極
12と、該帯電極12を先端部が外面16に露出するように保
持する絶縁体製の電極保持体14と、上記帯電極12から離
れた位置にて先端部が外面16に露出するように上記電極
保持体14に埋め込まれる汚れ検知電極15と、を有する帯
電ユニット８を備え、さらに、該帯電ユニット８の上記
電極保持体14の外面16にて上記帯電極12と汚れ検知電極
15との間を流れる表面リーク電流Ｉを検出する電極汚れ
検出回路17を、設けたことを特徴とする静電印刷装置。1. An electrostatic printing apparatus having a band electrode 12 for charging a surface of a plate cylinder 3 with an electrostatic charge.
12, an electrode holder 14 made of an insulator for holding the band electrode 12 so that the front end is exposed on the outer surface 16, and a front end exposed on the outer surface 16 at a position away from the band electrode 12. And a stain detection electrode 15 embedded in the electrode holder 14. The charging unit 8 further includes a band electrode 12 and a stain detection electrode on an outer surface 16 of the electrode holder 14 of the charging unit 8.
An electrostatic printing apparatus comprising an electrode contamination detection circuit 17 for detecting a surface leakage current I flowing between the electrode printing device and the electrode printing device.
有する静電印刷装置であって、上記除電極13と、該除電
極13を先端部が外面16に露出するように保持する絶縁体
製の電極保持体14と、上記除電極13から離れた位置にて
先端部が外面16に露出するように上記電極保持体14に埋
め込まれる汚れ検知電極15と、を有する除電ユニット９
を備え、さらに、該除電ユニット９の上記電極保持体14
の外面16にて上記除電極13と汚れ検知電極15との間を流
れる表面リーク電流Ｉを検出する電極汚れ検出回路17
を、設けたことを特徴とする静電印刷装置。2. An electrostatic printing apparatus having a neutralizing electrode 13 for neutralizing a printing material 6, comprising an insulating electrode for holding the neutralizing electrode 13 and a distal end of the neutralizing electrode 13 to be exposed on an outer surface 16. A static elimination unit 9 comprising: a body-made electrode holder 14; and a dirt detection electrode 15 embedded in the electrode holder 14 so that the distal end is exposed on the outer surface 16 at a position distant from the electrode 13.
And the electrode holder 14 of the static elimination unit 9.
An electrode contamination detection circuit 17 for detecting a surface leak current I flowing between the removal electrode 13 and the contamination detection electrode 15 on the outer surface 16 of the electrode 17
And an electrostatic printing device.
の帯電極12と被印刷物６を除電するための除電極13を有
する静電印刷装置であって、上記帯電極12と、該帯電極
12を先端部が外面に露出するように保持する絶縁体製の
電極保持体14と、上記帯電極12から離れた位置にて先端
部が外面16に露出するように上記電極保持体14に埋め込
まれる汚れ検知電極15と、を有する帯電ユニット８を備
え、かつ、上記除電極13と、該除電極13を先端部が外面
16に露出するように保持する絶縁体製の電極保持体14
と、上記除電極13から離れた位置にて先端部が外面16に
露出するように上記電極保持体14に埋め込まれる汚れ検
知電極15と、を有する除電ユニット９を備え、さらに、
上記帯電ユニット８及び除電ユニット９の上記電極保持
体14の外面16にて上記帯電極12と汚れ検知電極15との間
を流れる表面リーク電流Ｉ、及び、除電極13と汚れ検知
電極15との間を流れる表面リーク電流Ｉを、検出する電
極汚れ検出回路17を、設けたことを特徴とする静電印刷
装置。3. An electrostatic printing apparatus comprising: a band electrode 12 for charging a surface of a plate cylinder 3 with an electrostatic charge; and a discharging electrode 13 for discharging a printing material 6; Band electrode
An electrode holder 14 made of an insulator that holds the tip 12 to be exposed to the outer surface, and embedded in the electrode holder 14 so that the tip is exposed to the outer surface 16 at a position away from the band electrode 12. And a dirt detecting electrode 15 to be removed.
An electrode holder 14 made of an insulator that is held so as to be exposed at 16
And a dirt detection electrode 15 that is embedded in the electrode holder 14 so that a tip portion is exposed to the outer surface 16 at a position away from the discharge electrode 13.
A surface leak current I flowing between the band electrode 12 and the stain detection electrode 15 on the outer surface 16 of the electrode holder 14 of the charging unit 8 and the charge removal unit 9, and a difference between the surface leakage current I and the stain detection electrode 15. An electrostatic printing apparatus comprising an electrode contamination detection circuit 17 for detecting a surface leak current I flowing between the electrodes.
ーク電流Ｉが所定安全領域から外れると警報を発する警
報発生手段22が、設けられている請求項１，２又は３記
載の静電印刷装置。4. The electrostatic printing according to claim 1, further comprising an alarm generating means for generating an alarm when a surface leak current detected by the electrode contamination detecting circuit deviates from a predetermined safe area. apparatus.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29962296A JP3143594B2 (en) | 1996-10-23 | 1996-10-23 | Electrostatic printing device |
| EP97112236A EP0850759A1 (en) | 1996-10-11 | 1997-07-17 | Electrostatic assist system and method for monitoring the same |
| TW086110136A TW345544B (en) | 1996-10-11 | 1997-07-17 | Electrostatic printing apparatus and method for monitoring the same |
| KR1019970046662A KR100269581B1 (en) | 1996-10-11 | 1997-09-11 | Electrostatic assist system and method for monitoring the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29962296A JP3143594B2 (en) | 1996-10-23 | 1996-10-23 | Electrostatic printing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10119340A JPH10119340A (en) | 1998-05-12 |
| JP3143594B2 true JP3143594B2 (en) | 2001-03-07 |
Family
ID=17874998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29962296A Expired - Fee Related JP3143594B2 (en) | 1996-10-11 | 1996-10-23 | Electrostatic printing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3143594B2 (en) |
-
1996
- 1996-10-23 JP JP29962296A patent/JP3143594B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10119340A (en) | 1998-05-12 |
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