JP3607369B2

JP3607369B2 - Coating method and coating apparatus

Info

Publication number: JP3607369B2
Application number: JP17360895A
Authority: JP
Inventors: 繁栗原
Original assignee: Hitachi High Tech Instruments Co Ltd
Current assignee: Hitachi High Tech Instruments Co Ltd
Priority date: 1995-07-10
Filing date: 1995-07-10
Publication date: 2005-01-05
Anticipated expiration: 2015-07-10
Also published as: JPH0924323A

Description

【０００１】
【産業上の利用分野】
本発明は、塗布剤が充填されたシリンジ内へ圧縮空気を供給する側へ切替弁が切り替わった状態で圧縮空気の供給によりシリンジ先端の吐出ノズルより塗布剤を吐出させた後該切替弁を切替えシリンジを大気に開放させた状態でプリント基板への１塗布動作を行う塗布方法及び塗布装置に関する。
【０００２】
【従来の技術】
この種塗布装置には実開平７−５５１号公報に開示されているようなものがある。この種の塗布装置では、図４に示すように吐出バルブがＯＮである、即ち圧縮空気がシリンジ内に供給される状態の側に切り替わっている場合にはシリンジ内の圧力が上昇してシリンジ内の塗布剤が吐出ノズルより吐出され、その後吐出バルブが大気開放側に切り替わるこにより、シリンジ内の圧力が下がって行き大気に開放されるすなわち大気圧と同じになってから次の１塗布動作のために吐出バルブが圧縮空気を供給する側に切り替えられＯＮとなる。ノズルの先端には圧縮空気の圧力により塗布剤が吐出されその後シリンジ内が大気圧になることにより吐出が停止して所定の量の塗布剤がプリント基板に塗布されるものである。
【０００３】
【発明が解決しようとする課題】
しかし、前記従来技術では、ノズルからの塗布剤の吐出の停止していることが確実である大気圧への収束まで次の塗布動作を行わないため塗布動作のタクトタイムがアップできないという欠点があった。
【０００４】
そこで、本発明は塗布動作のタクトタイムを短くできるようにすることを目的とする。
【０００７】
【課題を解決するための手段】
このため本発明は、塗布剤が充填されたシリンジ内への圧縮空気の供給と大気側への開放を切替弁で切り替えることにより先ず圧縮空気の供給によりシリンジ先端の吐出ノズルより塗布剤を吐出させ所望のタイミングで切替弁を切替え大気側に開放してシリンジ先端の吐出ノズルより所望の量の塗布剤を吐出させてプリント基板への１塗布動作を行う塗布方法において、１塗布動作中の大気側への開放状態にてシリンジ内の圧力が大気圧まで下がる前に次の１塗布動作の塗布剤の吐出のために上昇するが少なくとも該圧力の最下降点では吐出ノズルよりの塗布剤の新たな吐出がなくなるような時点で切替弁を圧縮空気を供給する側に切り替えるようにしたものである。
【０００８】
また本発明は、塗布剤が充填されたシリンジ内へ圧縮空気を供給する側へ切替弁が切り替わった状態で圧縮空気の供給によりシリンジ先端の吐出ノズルより塗布剤を吐出させた後該切替弁を切替えシリンジを大気に開放させた状態でプリント基板への１塗布動作を行う塗布装置において、１塗布動作中の大気側への開放状態にてシリンジ内の圧力が大気圧まで下がる前に次の１塗布動作の塗布剤の吐出のために上昇するが少なくとも該圧力の最下降点で吐出ノズルよりの塗布剤の新たな吐出がなくなるような時点で切替弁を圧縮空気を供給する側に切り替えるよう制御する制御手段を設けたものである。
【０００９】
また本発明は、塗布剤が充填されたシリンジ内へ圧縮空気を供給する側へ切替弁が切り替わった状態で圧縮空気の供給によりシリンジ先端の吐出ノズルより塗布剤を吐出させた後該切替弁を切替えシリンジを大気に開放させた状態でプリント基板への１塗布動作を行う塗布方法において、１塗布動作中の大気側への開放状態にてシリンジ内の圧力が大気圧まで下がる前に次の１塗布動作の塗布剤の吐出のために上昇するよう前記切替弁を圧縮空気を供給する側に切り替える塗布動作を同一のシリンジにて連続して複数回行った後の次の塗布動作のための圧縮空気を供給する側への切替弁の切替はシリンジ内が大気圧まで下降してから行うようにしたものである。
【００１０】
また本発明は、塗布剤が充填されたシリンジ内へ圧縮空気を供給する側へ切替弁が切り替わった状態で圧縮空気の供給によりシリンジ先端の吐出ノズルより塗布剤を吐出させた後該切替弁を切替えシリンジを大気に開放させた状態でプリント基板への１塗布動作を行う塗布装置において、１塗布動作中の大気側への開放状態にてシリンジ内の圧力が大気圧まで下がる前に次の１塗布動作の塗布剤の吐出のために上昇するよう前記切替弁を圧縮空気を供給する側に切り替える塗布動作を同一のシリンジにて連続して行った回数を計数するカウンタと、該カウンタが所定の回数を計数した塗布動作の次の塗布動作のための圧縮空気を供給する側への切替弁の切替はシリンジ内が大気圧まで下降してから行うように制御する制御手段を設けたものである。
【００１３】
【作用】
請求項１の構成によれば、１塗布動作中の大気側への開放状態にてシリンジ内の圧力が大気圧まで下がる前に次の１塗布動作の塗布剤の吐出のために上昇するが少なくとも該圧力の最下降点では吐出ノズルよりの塗布剤の新たな吐出がなくなるような時点で切替弁を圧縮空気を供給する側に切り替えるようする。
【００１４】
請求項２の構成によれば、制御手段は１塗布動作中の大気側への開放状態にてシリンジ内の圧力が大気圧まで下がる前に次の１塗布動作の塗布剤の吐出のために上昇するが少なくとも該圧力の最下降点では吐出ノズルよりの塗布剤の新たな吐出がなくなるような時点で切替弁を圧縮空気を供給する側に切り替えるよう制御する。
【００１５】
請求項３の構成によれば、１塗布動作中の大気側への開放状態にてシリンジ内の圧力が大気圧まで下がる前に次の１塗布動作の塗布剤の吐出のために上昇するよう前記切替弁を圧縮空気を供給する側に切り替える塗布動作を同一のシリンジにて連続して複数回行った後の次の塗布動作のための圧縮空気を供給する側への切替弁の切替はシリンジ内が大気圧まで下降してから行うようにする。
【００１６】
請求項４の構成によれば、カウンタが１塗布動作中の大気側への開放状態にてシリンジ内の圧力が大気圧まで下がる前に次の１塗布動作の塗布剤の吐出のために上昇するよう前記切替弁を圧縮空気を供給する側に切り替える塗布動作を同一のシリンジにて連続して行った所定の回数を計数した時に制御手段は次の塗布動作のための圧縮空気を供給する側への切替弁の切替はシリンジ内が大気圧まで下降してから行うように制御する。
【００１７】
【実施例】
以下本発明の一実施例を図に基づき詳述する。
【００１８】
図２において、１はプリント基板であり、Ｘ軸モータ２及びＹ軸モータ３の駆動によりＸＹ方向に移動するＸＹテーブル４上に載置される。テーブル４の移動により位置決めされる。５は塗布ヘッド部であり、吐出ノズル６を先端に有するシリンジ７が４本上下動可能に設けられている。前記テーブル４の移動により位置決めされたプリント基板の所望の位置に選択された所望のシリンジ７が下降して該シリンジ７内に貯留された塗布剤としての接着剤が吐出ノズル６より吐出されて塗布される。
【００１９】
１１は図示しない上流装置から受け取った基板１を前記ＸＹテーブル４に移送する供給コンベアであり、１２は該テーブル４上で接着剤の塗布（通常複数個所に塗布される。）が終了した基板を下流装置に排出する排出コンベアである。該下流装置は通常はチップ状電子部品をプリント基板１に装着する電子部品装着装置であり、塗布された接着剤の上に電子部品の装着がなされ、接着剤は当該部品を仮止めするものである。
【００２０】
次に、図３に基づき本実施例の塗布装置についての制御回路について説明する。
【００２１】
１４は制御手段としてのＣＰＵであり、ＲＯＭ１５に格納されたプログラムに基づき、操作部１６の操作に応答して、またＲＡＭ１７に格納されたデータに従い塗布動作に係わる種々の動作をを制御する。
【００２２】
該ＣＰＵ１４にはインターフェース１８を介して吐出バルブ１９が接続され、該バルブの切替が制御される。吐出バルブ１９にはエア源２０に連通するレギュレータ２１が接続され、エア源２０から供給される圧縮空気がレギュレータ２１で所定の空気圧になされて吐出バルブを介してシリンジ７内に送り込まれる。
【００２３】
吐出バルブ１９はシリンジ７をレギュレータ２１側に接続するか、図示しない大気開放口に接続して大気に開放するかを切替える働きをする。吐出バルブ１９をレギュレータ２１側に切替えることを吐出バルブ１９をＯＮするまたは開くとも言い、吐出バルブ１９を大気開放側に切り替えることを吐出バルブ１９をＯＦＦするまたは閉じるとも言う。
【００２４】
先ず吐出バルブ１９の開閉動作による１塗布動作のタクトタイムを設定する。
【００２５】
１回の塗布動作で基板１に塗布する接着剤の量は、吐出バルブ１９がＯＮとなっている時間により決まり、所定の圧力が所定の時間かかることによりノズル６の先端より所定量の接着剤が吐出され、この吐出された接着剤が基板１に塗布される。
【００２６】
また、吐出バルブ１９がＯＦＦにされてから、シリンジ７内の圧力は除々に減圧し大気圧と同じになるには時間が掛かるが、大気圧まで下降せずとも、ノズル６から接着剤が新たに吐出しなくなる圧力の値がある。このように新たに接着剤が吐出しない状態になった時以後にノズル６の先端に吐出されている接着剤が基板１上に接触して塗布されると、その後上昇するノズル６より塗布した接着剤は分離され、分離されずに糸を引く所謂糸引きの状態になることがない。
【００２７】
この圧力までシリンジ７内の圧力が下がらない間に吐出バルブ１９がＯＮされるとノズル６からの接着剤の吐出が停止することがなくなり、ノズル６が下降して接着剤が基板に接触して、ノズル６が上昇する時にも新たにノズル６から接着剤が吐出され続けられているので、基板１上の接着剤とノズル６が分離されずに糸引きの状態となる。
【００２８】
吐出バルブ１９が閉じられてからこの圧力に下がるまでの時間は一定であるので、この時間を測定すれば、吐出バルブ１９をＯＮにしている時間を加算することにより吐出バルブ１９の１回の開閉動作及び吐出ノズル６の１回の下降、上昇動作で構成する１塗布動作のタクトタイムを決定することができる。
【００２９】
このようにして、決定された吐出バルブ１９のＯＮ時間及びＯＦＦ時間は操作部１６を操作者が操作することにより（キーボード等の操作による。）、ＲＡＭ１７内に設定され記憶される。
【００３０】
以上のような構成により以下動作について説明する。
【００３１】
先ず、供給コンベア１１の搬送によりプリント基板１がＸＹテ−ブル４上に載置され、ＲＡＭ１７等に記憶された図示しない種々の塗布動作に関するデータに従って、ＸＹテ−ブル４が移動され、接着剤を塗布すべき基板１の位置が位置決めされる。ＸＹテ−ブル４の位置決めに並行して、吐出バルブ１９が図１に示すようにＣＰＵ１４の指令信号の立ち上げに応じ、開かれる（レギュレータ２１側に切り替えられる。）。設定されたＯＮ時間開かれると、吐出バルブ１９は指令信号の立ち下がりに応じ閉じられる（大気開放側に切り替えられる。）。
【００３２】
この結果、図１に示すように短い遅れ時間の後にシリンジ７内の圧力は下降して行き、所定の時間（ＲＡＭ１７に記憶されている。）時間ＯＦＦ状態の後に次の１塗布動作のために吐出バルブ１９がＯＮされる。
【００３３】
上記のバルブ１９の開閉動作と並行して塗布動作を行うために選択された該バルブ１９に対応するシリンジ７が下降を開始し（吐出バルブ１９がＯＦＦに切り替わった時には下降している。）、ノズル６の先端より吐出した接着剤が基板１の所定の位置に接触してノズル６が上昇することによりノズル６と接着剤は分離して基板１上に塗布され、１塗布動作が完了する。通常はシリンジ７内の圧力が図１の最下降点に達する前にノズル６は最下降位置まで下降して接着剤が基板１に接触し塗布され、接着剤が吐出すべき量吐出を完了した時点（通常は圧力が最下降点に達するよりも少し前の時点か少なくとも最下降点に達する時点）以降で次の塗布動作のための接着剤の吐出がなされない前にノズル６の上昇がなされる。
【００３４】
尚、ノズル６の上昇時に接着剤の新たな吐出がされていても、糸引きがなけれは、または糸引きがあっても許容できる程度であれば、そのようなタイミングでバルブ１９の開閉がなされていもよい。
【００３５】
図１の塗布（吐出）時間と示されている時間がこの場合のタクトタイムであり、その右隣の矢印の間隔で示す時間を加えたものが大気圧まで下降するまでの時間であり、この矢印の間隔だけ大気圧まで下降するまで待つ場合よりもタクトがアップするものである。
【００３６】
次に、次の１塗布動作のための吐出バルブ１９の指令信号が立ち上がり吐出バルブ１９が開かれ、所定の遅れ時間の後シリンジ７内の圧力が上昇し、接着剤が吐出ノズル６より吐出を開始し、また、ＸＹテ−ブル４がプリント基板１を次の塗布位置に位置決めして、前述と同様に次の１塗布動作が行われる。
【００３７】
このように同一のシリンジ７を連続して使用して接着剤の塗布を行う場合には、シリンジ７内を大気圧まで下降させずに次の吐出のためにシリンジ７内の圧力を上げるため、シリンジ７内が加熱され温度が上昇するので、同一のシリンジ７で塗布動作を連続して行った回数をカウントして所定の回数（任意に設定可能としておけばよい。）塗布動作を行った場合には、その後の同一シリンジ７を用いた塗布動作のための吐出バルブ１９のＯＮは大気圧まで下降してから行うようにすればよい。大気圧まで下降してから吐出バルブ１９をＯＮするようにする塗布動作は１回でも複数回でもよく、任意に設定可能としておけばよく、その設定値はＲＡＭ１７内に格納して、カウンタはＣＰＵ１４、ＲＡＭ１７及びＲＯＭ１５により構成され、ＲＡＭ１７の設定値に達した場合に次の塗布動作の吐出バルブ１９の開動作のタイミングを大気圧まで下降した後に行うよう制御すればよい。この回数はＲＯＭ１５内に記憶することもできるが、任意の設定はできなくなる。大気圧まで下降するまで待つ制御は大気圧まで下降する時間をＲＡＭ１７またはＲＯＭ１５に記憶しておくことで達成できる。
【００３８】
従って、大気圧まで下降させずに、連続して同一のシリンジ７より接着剤の塗布動作を行ってから他のシリンジ７より接着剤の塗布動作を行う場合には、前記回数のカウント値はクリアされ、次に、当該シリンジ７より接着剤の塗布動作を行うときのカウントは１よりスタートされることになる。
【００３９】
また、シリンジ７内の温度の検出センサを設けておき、大気圧まで下降させないで次の塗布動作のバルブ１９のＯＮを行っていて、所定の温度（設定可能とする。）に上昇したことを検出した場合に、次の塗布動作の吐出バルブ１９のＯＮはシリンジ内７が大気圧に下がってから（そのような時間がたってから、）、行うようにして、このようにしてシリンジ７内の温度が所定の温度（設定可能）に下降してからは、次の塗布動作のためのバルブ１９のＯＮタイミングは大気圧まで下降しない時間で行うようにしてもよい。
【００４０】
または、大気圧迄下降しない前にバルブ１９をＯＮすることによるシリンジ７の温度上昇を防ぐためにシリンジ７の外側にファンで送風して空冷するなどの処置をしてもよい。
【００４１】
以上のようにして、データに示す塗布すべき全ての位置に接着剤の塗布がなされると、当該基板１はＸＹテ−ブル４より排出コンベア１２に移載され、下流装置に排出搬送される。
【００４２】
【発明の効果】
以上のように本発明は、次の１塗布動作の吐出のために切替弁の圧縮空気の供給側への切替をシリンジ内の圧力が大気圧まで下がらない間に上昇するように行うので、大気圧まで下がってから上げるようにする場合に比較して早いタイミングで塗布剤の吐出を開始させることができ、塗布動作のタクトタイムを短縮することができる。
【００４３】
また、シリンジ内の圧力の最下降点で塗布剤の新たな吐出がないようにしておけばノズルの下降により塗布剤が基板に塗布された後に塗布剤が糸引きを起こす恐れがなくなる。
【００４４】
また、連続して大気圧まで下がらない前に次の吐出バルブの切替を行った後に大気圧まで下降してから次の吐出バルブの切替を行うようにするので、シリンジの温度の上昇を抑えることができる。
【図面の簡単な説明】
【図１】シリンジ内の圧力変化及び吐出バルブ指令信号の状態を示す図である。
【図２】塗布装置の正面図である。
【図３】塗布装置の制御回路を示す図である。
【図４】従来例のシリンジ内の圧力及び吐出バルブ指令信号の状態を示す図である。
【符号の説明】
１プリント基板
６吐出ノズル
７シリンジ
１４ＣＰＵ（制御手段、カウンタ）
１７ＲＡＭ（カウンタ）
１９吐出バルブ（切替弁）[0001]
[Industrial application fields]
The present invention switches the switching valve after discharging the coating agent from the discharge nozzle at the tip of the syringe by supplying compressed air in a state where the switching valve is switched to the side supplying the compressed air into the syringe filled with the coating agent. The present invention relates to a coating method and a coating apparatus that perform one coating operation on a printed circuit board with a syringe open to the atmosphere.
[0002]
[Prior art]
This type of coating device is disclosed in Japanese Utility Model Laid-Open No. 7-551. In this type of coating apparatus, as shown in FIG. 4, when the discharge valve is ON, that is, when the compressed air is switched to the side where the compressed air is supplied into the syringe, the pressure in the syringe rises and Is discharged from the discharge nozzle, and then the discharge valve is switched to the atmosphere opening side, so that the pressure in the syringe is lowered and released to the atmosphere, that is, the same as the atmospheric pressure. Therefore, the discharge valve is switched to the compressed air supply side and turned ON. The coating agent is discharged to the tip of the nozzle by the pressure of compressed air, and then the discharge is stopped when the pressure in the syringe becomes atmospheric pressure, and a predetermined amount of the coating agent is applied to the printed circuit board.
[0003]
[Problems to be solved by the invention]
However, the conventional technique has a drawback in that the tatting time of the coating operation cannot be increased because the next coating operation is not performed until the convergence to the atmospheric pressure where it is certain that the discharge of the coating agent from the nozzle has stopped. It was.
[0004]
Accordingly, an object of the present invention is to shorten the takt time of the coating operation.
[0007]
[Means for Solving the Problems]
Therefore, in the present invention, the supply of compressed air into the syringe filled with the coating agent and the opening to the atmosphere side are switched by a switching valve so that the coating agent is first discharged from the discharge nozzle at the tip of the syringe by the supply of compressed air. In an application method for performing one application operation on a printed circuit board by switching the switching valve at a desired timing and opening it to the atmosphere side to discharge a desired amount of coating agent from the discharge nozzle at the tip of the syringe, the atmosphere side during one application operation In the open state, the pressure in the syringe rises to discharge the coating agent in the next one application operation before dropping to the atmospheric pressure, but at least at the lowest point of the pressure, a new coating agent is discharged from the discharge nozzle. The switching valve is switched to the compressed air supply side at the time when the discharge is stopped.
[0008]
In the present invention, the switching valve is discharged from the discharge nozzle at the tip of the syringe by supplying compressed air in a state where the switching valve is switched to the side where compressed air is supplied into the syringe filled with the coating agent. In the coating apparatus that performs one coating operation on the printed circuit board with the switching syringe opened to the atmosphere, the following 1 is performed before the pressure in the syringe is reduced to atmospheric pressure in the opened state to the atmosphere side during the one coating operation. Control to switch the switching valve to the supply side of compressed air at the point when it rises for the discharge of the coating agent in the coating operation but there is no new discharge of the coating agent from the discharge nozzle at least at the lowest point of the pressure The control means to provide is provided.
[0009]
In the present invention, the switching valve is discharged from the discharge nozzle at the tip of the syringe by supplying compressed air in a state where the switching valve is switched to the side where compressed air is supplied into the syringe filled with the coating agent. In an application method in which one application operation to the printed circuit board is performed with the switching syringe open to the atmosphere, the following 1 is performed before the pressure in the syringe drops to atmospheric pressure in the open state to the atmosphere side during the one application operation. Compression for the next application operation after the application operation for switching the switching valve to the side where compressed air is supplied so as to rise for the discharge of the application agent in the application operation is continuously performed a plurality of times with the same syringe. The switching of the switching valve to the air supply side is performed after the inside of the syringe is lowered to the atmospheric pressure.
[0010]
In the present invention, the switching valve is discharged from the discharge nozzle at the tip of the syringe by supplying compressed air in a state where the switching valve is switched to the side where compressed air is supplied into the syringe filled with the coating agent. In the coating apparatus that performs one coating operation on the printed circuit board with the switching syringe opened to the atmosphere, the following 1 is performed before the pressure in the syringe is reduced to atmospheric pressure in the opened state to the atmosphere side during the one coating operation. A counter that counts the number of times that the application operation for switching the switching valve to the side that supplies compressed air so as to rise for discharging the application agent in the application operation is continuously performed with the same syringe; The switching of the switching valve to the compressed air supply side for the coating operation next to the coating operation after counting the number of times is provided with a control means for performing control after the inside of the syringe is lowered to the atmospheric pressure. That.
[0013]
[Action]
According to the configuration of claim 1 , the pressure in the syringe rises to discharge the coating agent in the next one application operation before the pressure in the syringe decreases to the atmospheric pressure in the open state to the atmosphere side during one application operation. At the lowest point of the pressure, the switching valve is switched to the compressed air supply side at the time when there is no more new discharge of the coating agent from the discharge nozzle.
[0014]
According to the configuration of the second aspect , the control means rises to discharge the coating agent in the next one application operation before the pressure in the syringe drops to the atmospheric pressure in the open state to the atmosphere side during the one application operation. However, at least at the lowest point of the pressure, control is performed so that the switching valve is switched to the compressed air supply side at the time when there is no new discharge of the coating agent from the discharge nozzle.
[0015]
According to the configuration of the third aspect , the pressure in the syringe rises for discharging the coating agent in the next one application operation before the pressure in the syringe is lowered to the atmospheric pressure in the open state to the atmosphere side during the one application operation. Switching the switching valve to the side that supplies compressed air The switching operation of the switching valve to the side that supplies compressed air for the next coating operation after performing the coating operation continuously several times with the same syringe is in the syringe Do this after the pressure has decreased to atmospheric pressure.
[0016]
According to the configuration of the fourth aspect , the counter rises for the discharge of the coating agent in the next one application operation before the pressure in the syringe decreases to the atmospheric pressure in the open state to the atmosphere side during the one application operation. When the application operation for switching the switching valve to the compressed air supply side is continuously performed with the same syringe, the control means counts the compressed air for the next application operation. The switching of the switching valve is controlled to be performed after the inside of the syringe is lowered to the atmospheric pressure.
[0017]
【Example】
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
[0018]
In FIG. 2, reference numeral 1 denotes a printed circuit board, which is placed on an XY table 4 that moves in the XY directions by driving an X-axis motor 2 and a Y-axis motor 3. Positioning is performed by moving the table 4. Reference numeral 5 denotes an application head portion, and four syringes 7 each having a discharge nozzle 6 at the tip are provided so as to be movable up and down. The desired syringe 7 selected at a desired position on the printed circuit board positioned by the movement of the table 4 is lowered, and the adhesive as the coating agent stored in the syringe 7 is discharged from the discharge nozzle 6 and applied. Is done.
[0019]
Reference numeral 11 denotes a supply conveyor for transferring the substrate 1 received from an upstream apparatus (not shown) to the XY table 4, and 12 denotes a substrate on which application of adhesive (usually applied to a plurality of locations) has been completed on the table 4. It is a discharge conveyor which discharges to a downstream device. The downstream device is usually an electronic component mounting device for mounting a chip-shaped electronic component on the printed circuit board 1, and the electronic component is mounted on the applied adhesive, and the adhesive temporarily fixes the component. is there.
[0020]
Next, a control circuit for the coating apparatus of this embodiment will be described with reference to FIG.
[0021]
Reference numeral 14 denotes a CPU as control means, which controls various operations related to the coating operation in response to an operation of the operation unit 16 based on a program stored in the ROM 15 and according to data stored in the RAM 17.
[0022]
A discharge valve 19 is connected to the CPU 14 via an interface 18, and switching of the valve is controlled. A regulator 21 communicating with the air source 20 is connected to the discharge valve 19, and compressed air supplied from the air source 20 is made into a predetermined air pressure by the regulator 21 and sent into the syringe 7 through the discharge valve.
[0023]
The discharge valve 19 functions to switch whether the syringe 7 is connected to the regulator 21 side or connected to an air opening (not shown) to be opened to the atmosphere. Switching the discharge valve 19 to the regulator 21 side is also referred to as turning on or opening the discharge valve 19, and switching the discharge valve 19 to the atmosphere release side is also referred to as turning off or closing the discharge valve 19.
[0024]
First, the takt time for one application operation by the opening / closing operation of the discharge valve 19 is set.
[0025]
The amount of adhesive applied to the substrate 1 in one application operation is determined by the time during which the discharge valve 19 is ON, and a predetermined amount of adhesive is applied from the tip of the nozzle 6 by applying a predetermined pressure for a predetermined time. Is discharged, and the discharged adhesive is applied to the substrate 1.
[0026]
Further, after the discharge valve 19 is turned off, it takes time for the pressure in the syringe 7 to gradually decrease to the same pressure as the atmospheric pressure, but the adhesive is newly discharged from the nozzle 6 without lowering to the atmospheric pressure. There is a pressure value that stops. When the adhesive discharged to the tip of the nozzle 6 is applied on the substrate 1 after the state where the adhesive is no longer discharged in this way, the adhesive applied from the nozzle 6 that rises thereafter is applied. The agent is separated and does not become a so-called stringing state in which the yarn is pulled without being separated.
[0027]
If the discharge valve 19 is turned on while the pressure in the syringe 7 does not drop to this pressure, the discharge of the adhesive from the nozzle 6 will not stop, and the nozzle 6 will descend and the adhesive will contact the substrate. Since the adhesive is continuously being discharged from the nozzle 6 even when the nozzle 6 is raised, the adhesive on the substrate 1 and the nozzle 6 are not separated but are in a stringing state.
[0028]
Since the time from when the discharge valve 19 is closed to when the pressure drops to this pressure is constant, if this time is measured, the discharge valve 19 is opened and closed once by adding the time during which the discharge valve 19 is turned on. It is possible to determine the takt time of one application operation composed of the operation and the single lowering and raising operation of the discharge nozzle 6.
[0029]
In this way, the determined ON time and OFF time of the discharge valve 19 are set and stored in the RAM 17 when the operator operates the operation unit 16 (by operation of the keyboard or the like).
[0030]
The operation will be described below with the above configuration.
[0031]
First, the printed circuit board 1 is placed on the XY table 4 by the conveyance of the supply conveyor 11, and the XY table 4 is moved in accordance with data relating to various coating operations (not shown) stored in the RAM 17 or the like. The position of the substrate 1 to be coated is positioned. In parallel with the positioning of the XY table 4, the discharge valve 19 is opened (switched to the regulator 21 side) in response to the start of the command signal of the CPU 14, as shown in FIG. When the set ON time is opened, the discharge valve 19 is closed in response to the fall of the command signal (switched to the atmosphere release side).
[0032]
As a result, as shown in FIG. 1, the pressure in the syringe 7 decreases after a short delay time, and for the next one application operation after a predetermined time (stored in the RAM 17) time OFF state. The discharge valve 19 is turned on.
[0033]
The syringe 7 corresponding to the valve 19 selected to perform the coating operation in parallel with the opening / closing operation of the valve 19 starts to descend (lowers when the discharge valve 19 is switched OFF). When the adhesive discharged from the tip of the nozzle 6 comes into contact with a predetermined position of the substrate 1 and the nozzle 6 moves up, the nozzle 6 and the adhesive are separated and applied onto the substrate 1 to complete one application operation. Normally, before the pressure in the syringe 7 reaches the lowest point in FIG. 1, the nozzle 6 is lowered to the lowest position, the adhesive contacts the substrate 1 and is applied, and the discharge of the amount that the adhesive should discharge is completed. After the time point (usually at a time slightly before the pressure reaches the lowest point or at least when the pressure reaches the lowest point), the nozzle 6 is raised before the adhesive is not discharged for the next coating operation. The
[0034]
Even if the adhesive is newly discharged when the nozzle 6 is lifted, the valve 19 is opened and closed at such timing as long as the stringing is not permitted or even if the stringing is acceptable. May be.
[0035]
The time indicated as the application (discharge) time in FIG. 1 is the tact time in this case, and the time until the pressure falls to the atmospheric pressure is the time indicated by the interval indicated by the arrow next to the right. The tact time is higher than when waiting until the pressure decreases to the atmospheric pressure by the interval of the arrows.
[0036]
Next, the command signal of the discharge valve 19 for the next one application operation rises and the discharge valve 19 is opened. After a predetermined delay time, the pressure in the syringe 7 rises and the adhesive is discharged from the discharge nozzle 6. The XY table 4 positions the printed circuit board 1 at the next application position, and the next application operation is performed in the same manner as described above.
[0037]
In this way, when applying the adhesive using the same syringe 7 continuously, in order to increase the pressure in the syringe 7 for the next discharge without lowering the inside of the syringe 7 to atmospheric pressure, When the inside of the syringe 7 is heated and the temperature rises, the number of times that the application operation is continuously performed with the same syringe 7 is counted and the application operation is performed a predetermined number of times (can be arbitrarily set). In this case, the discharge valve 19 for the subsequent application operation using the same syringe 7 may be turned on after the pressure is lowered to the atmospheric pressure. The application operation for turning on the discharge valve 19 after dropping to the atmospheric pressure may be performed once or plural times, and may be arbitrarily set. The set value is stored in the RAM 17, and the counter is the CPU 14. It is configured by the RAM 17 and the ROM 15, and when the set value of the RAM 17 is reached, the timing of the opening operation of the discharge valve 19 of the next coating operation may be controlled after being lowered to the atmospheric pressure. This number of times can be stored in the ROM 15 but cannot be arbitrarily set. Control for waiting until the pressure falls to the atmospheric pressure can be achieved by storing the time for the pressure to fall to the atmospheric pressure in the RAM 17 or the ROM 15.
[0038]
Therefore, when the adhesive application operation is continuously performed from the same syringe 7 without lowering the pressure to the atmospheric pressure, the count value of the number of times is cleared. Next, the count when the adhesive is applied from the syringe 7 is started from 1.
[0039]
Further, a detection sensor for the temperature in the syringe 7 is provided, and the valve 19 for the next application operation is turned on without being lowered to atmospheric pressure, and the temperature has risen to a predetermined temperature (can be set). When detected, the discharge valve 19 for the next application operation is turned on after the syringe inner 7 has been reduced to atmospheric pressure (after such time has elapsed), and in this manner, After the temperature has dropped to a predetermined temperature (which can be set), the ON timing of the valve 19 for the next coating operation may be performed in a time that does not drop to atmospheric pressure.
[0040]
Alternatively, in order to prevent the temperature of the syringe 7 from rising due to turning on the valve 19 before the pressure falls to the atmospheric pressure, a measure such as air cooling by blowing with a fan outside the syringe 7 may be performed.
[0041]
As described above, when the adhesive is applied to all the positions to be applied shown in the data, the substrate 1 is transferred from the XY table 4 to the discharge conveyor 12 and discharged to the downstream apparatus. .
[0042]
【The invention's effect】
As described above, the present invention switches the switching valve to the compressed air supply side for discharging the next one application operation so that the pressure in the syringe rises while it does not drop to atmospheric pressure. Compared with the case where the pressure is lowered to the atmospheric pressure and then raised, the discharge of the coating agent can be started at an earlier timing, and the tact time of the coating operation can be shortened.
[0043]
Further, if the discharge of the coating agent is not performed at the lowest point of the pressure in the syringe, there is no possibility that the coating agent may cause stringing after the coating agent is applied to the substrate by lowering the nozzle.
[0044]
Also, since the next discharge valve is switched before the atmospheric pressure does not drop continuously, the next discharge valve is switched after the pressure drops to the atmospheric pressure. Can do.
[Brief description of the drawings]
FIG. 1 is a diagram showing a pressure change in a syringe and a state of a discharge valve command signal.
FIG. 2 is a front view of the coating apparatus.
FIG. 3 is a diagram showing a control circuit of a coating apparatus.
FIG. 4 is a diagram showing the pressure in a syringe and the state of a discharge valve command signal in a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Printed circuit board 6 Discharge nozzle 7 Syringe 14 CPU (control means, counter)
17 RAM (counter)
19 Discharge valve (switching valve)

Claims

By switching the supply of compressed air into the syringe filled with the coating agent and opening to the atmosphere with the switching valve, the coating agent is first discharged from the discharge nozzle at the tip of the syringe by the supply of compressed air, and the switching valve at a desired timing. In a coating method in which a desired amount of coating agent is ejected from the discharge nozzle at the tip of the syringe and one coating operation is performed on the printed circuit board in an open state to the atmosphere side during one coating operation Before the pressure in the syringe drops to atmospheric pressure, it rises for the discharge of the coating agent in the next one application operation, but at the time when there is no new discharge of the coating agent from the discharge nozzle at least at the lowest point of the pressure And switching the switching valve to the compressed air supply side.

After the switching valve is switched to the side where compressed air is supplied into the syringe filled with the coating agent, the coating agent is discharged from the discharge nozzle at the tip of the syringe by supplying compressed air, and then the switching valve is switched to the atmosphere. In a coating apparatus that performs one coating operation on a printed circuit board in an open state, the coating agent for the next one coating operation before the pressure in the syringe drops to atmospheric pressure in the open state to the atmosphere during the one coating operation. There is provided a control means for controlling the switching valve to switch to the compressed air supply side at a point in time when there is no new discharge of the coating agent from the discharge nozzle at least at the lowest point of the pressure. An applicator characterized by that.

After the switching valve is switched to the side where compressed air is supplied into the syringe filled with the coating agent, the coating agent is discharged from the discharge nozzle at the tip of the syringe by supplying compressed air, and then the switching valve is switched to the atmosphere. In a coating method for performing one coating operation on a printed circuit board in an opened state, the coating agent for the next one coating operation is performed before the pressure in the syringe is reduced to atmospheric pressure in the opened state to the atmosphere during the one coating operation. The side which supplies the compressed air for the next application | coating operation | movement after performing the application | coating operation | movement which switches the said switching valve to the side which supplies a compressed air so that it may rise for discharge of the multiple times continuously with the same syringe The switching method of switching to is performed after the inside of the syringe is lowered to atmospheric pressure .

In a state where the switching valve is switched to the side where compressed air is supplied into the syringe filled with the coating agent, the coating agent is discharged from the discharge nozzle at the tip of the syringe by supplying compressed air, and then the switching valve is switched to the atmosphere. In a coating apparatus that performs one coating operation on a printed circuit board in an open state, the coating agent for the next one coating operation before the pressure in the syringe drops to atmospheric pressure in the open state to the atmosphere during the one coating operation. A counter that counts the number of times that the application operation for switching the switching valve to the side that supplies compressed air so as to rise for the discharge of the same syringe is performed continuously, and the application that the counter counts a predetermined number of times coating, characterized in that the switching of the switching valve to the side for supplying compressed air for the next coating operation behavior provided with control means for controlling to perform the lowered within the syringe to atmospheric pressure Location.