JP3738226B2 - Bag making and packaging machine and lateral heat sealing control method for bag making and packaging machine - Google Patents

Description

となり、また、その反力Ｒは歪δに反比例した
Ｒ＝Ｅ×ｂ×ｔ×ｔ×ｔ×δ/（Ｄ×Ｄ×Ｄ）…（２）
となる。ここで、Ｅ，Ｉはそれぞれ、支持バネ７１のヤング率と断面２次モーメントである。
【００４５】
したがって、左右の支持バネ７１，７１は、それぞれ変位量δｌ，δｒに比例した反力Ｒｌ，Ｒｒをもって、横シールジョー２０の各支持部分を相手の横シールジョー２０に向け押圧して、これを復帰させる。
いま、一例として、有効長Ｄが４４ｍｍ、板厚ｔが５ｍｍ、板幅ｂが１８ｍｍ、ヤング率が２．１×１０ ｋｇ／ｍｍ2の支持バネ７１に５００ｋｇの荷重が作用して、左右の支持バネ７１，７１がそれぞれ０．５ｍｍと０．４ｍｍ変形したとすると、式（２）から、左側の支持バネ７１は、その反力Ｒｌ＝２７８Ｋｇをもって、また右側の支持バネ７１は、その圧力Ｒｒ＝２２２ｋｇをもって、横シールジョー２０を復帰方向に押圧してその変位を補いつつ、包材Ｓに場所的に均一な横シールを施す。
【００４６】
第１１図は支持バネの変形例を示したものである。同図において、横シールジョー２０Ａの両側にそれぞれ内方に向かうスリット７２，７２を形成し、このスリット７２によって横シールジョー２０Ａの本体から分かれた部分を、片持ち梁状の弾性を有する支持バネ部７３，７３として構成したものである。
【００４７】
また第１２図に示した変形例は、横シールジョー２ＯＢのケース２００を中空弾性体として構成し、上記ケース２００自体の撓み量に比例した反力を付与して、横シールジョー２ＯＢの変位を補うようにしたものであるが、同時に、その中空部分７４に鉛のような低温で溶融する流体７５を封入しておくことにより、横シールジョー２ＯＢに均一な熱バランスを持たせるようにすることもできる。この場合は、上記ケース２００が復帰手段を構成する。
なお、上記バネ部材７１，７３又は中空弾性体２ＯＢは、一方の横シールジョーにのみ適用することもできる。
【００４８】
第１３図は、本発明の第３の実施例を示したものである。
この実施例は、旋回アーム１１の先端に横シールジョー２０としごき板６１を併設し、直線走行区間Ｉ→IIIの前半で、包材Ｓに対するしごき動作をしごき板６１により行わせるとともに、直線走行区間Ｉ→III の後半で、包材Ｓに対する横シール動作を横シールジョー２０により行わせるように構成したものである。 すなわち、この実施例では、横シールジョー２０に直線走行軌跡の長さ（シールのストローク長さ）を異ならせる各種のＤ型軌跡を画かせる手段、つまり旋回アーム１１の軸移動手段として、異なる案内面を持つ２つのアーム軸移動用カム８４Ａ，８４Ｂを、相対的な回転方向位置の調整が可能に同軸上に取付けて回転させる一方、横シール行程II−IIIにおいては、両シールジョー２０，２０に包材Ｓに適した圧接力を付与させることができるよう、一方もしくは双方のカム軸８５（この実施例では右側のカム軸８５）を、エアシリンダ８６によって他方のカム軸８５方向へ付勢するように構成したものである。
【００４９】
そして、エア供給源８７からエアシリンダ８６に至るエア供給管には、横シール行程II−III においてのみ管路を開放する電磁弁８８と、接触圧が設定圧力を越えたときに動作する外部パイロット型シーケンス弁８９とを設けて、一定の圧接力により横シールを行わせる一方、アーム旋回用サーボモータに対しては、しごき行程Ｉ−IIで回転速度が大きくなるような制御を行って、横シール動作の前にしごき動作をいち早く終了させるように構成されている。
この第３実施例では、上述したアーム旋回用サーボモータと、これに連動するアーム軸移動用カム８４Ａ、８４Ｂにより、横シールジョー２０，２０が直線走行区間の前半、つまりしごき行程Ｉ−IIに達したら、アーム軸移動用カム８４Ａ，８４Ｂはエアシリンダ８６の不作動下で旋回アーム１１，１１を離間させ、同時に、アーム旋回用サーボモータの回転速度を高めて、しごき板６１，６１を包材Ｓの搬送速度より速い速度で直線走行させつつ、これらに所要のしごき動作を行わせる。
【００５０】
そしてつぎに、横シールジョー２０，２０が横シール行程II−IIIに入ったら、アーム旋回用サーボモータを定回転に戻すとともに電磁弁８８を開放し、外部パイロット式シーケンス弁８９を介してエアをエアシリンダ８６内に導入し、予め設定された圧力をもってアーム軸移動用カム８４Ａ，８４Ｂを他方のカム８４Ａ，８４Ｂに向けて押圧しつつ、両横シールジョー２０，２０に包材Ｓの膜厚や材質に応じた押庄力を付与して所要のシール動作を行わせる。
上記しごき行程Ｉ−IIは一方のカム８４Ｂで、横シール行程II−IIIは他方のカム８４Ａで制御される。したがって、上記両カム８４Ａ、８４Ｂの相対的な回転方向位置を変えることにより、上記両行程Ｉ−II，II−IIIのストローク長さが変わる。
なお、この第３実施例では、アーム軸移動手段として２つのカム８４Ａ，８４Ｂを用いているが、これをエアシリンダ等を用いた他の軸移動手段に替えることもできる。
【００５１】
第１４図は本発明の第４実施例を示すもので、横シール中に、横シールジョー２０を支持する旋回アーム１１を包材Ｓの移送方向Ａに所定ストロークだけ移動させる移動手段Ｋを設けたものである。すなわち、一対の旋回アーム１１，１１の各基端部を保持する一対の側板９１，９２を、それらの前端と後端に固定した各結合板９３，９４によって結合して、旋回アーム１１，１１を囲むような形状の移動枠９０が構成され、この可動枠９０は、本体フレーム４６上に立設した４本のガイドロッド９５，・・・に案内されて上下に摺動し得るように取付けられている。
【００５２】
符号９６は、横シールジョー２０に所要の楕円軌跡を画かせるべく可動枠９０を昇降動させるための駆動モータ（縦移動用モータ）で、この駆動モータ９６には、所定のタイミングで回転方向を切換えることができるＡＣサーボモータが使用される．上記移動枠９０、ガイドロッド９５及び駆動モータ９６が上記移動手段Ｋを構成している。
【００５３】
そして、横シールジョー２０，２０が互いに接合位置及び最大離間位置近傍に達する都度、後述する制御手段により、上記駆動モータ９６を正転及び反転させ、駆動軸を形成するネジ棒９７と螺合する移動枠９０上のブラケット９８を介して、旋回アーム１１，１１を設定した量のストロークをもって上下に駆動するように構成されている。その他の構成は、第３図に示されたアーム水平移動機構を有しない点以外は、第１図及び第２図に示した第１実施例と同一である。
【００５４】
第１５図は、アーム旋回用駆動モータ２９と、アーム昇降用駆動モータ９６を制御する回路を示したもので、また第１６図は、アーム旋回用駆動モータ２９とアーム昇降用駆動モータ９６の関連動作による旋回アーム１１の動きを示したものである。
【００５５】
第１５図の符号１０１は、ある基準点Ｉからの旋回アーム１１の回転角を、アーム旋回用駆動モータ２９の回転をもとに検出するアーム回転角検出手段で、旋回アーム１１の回転角に比例したパルス信号は、この検出手段１０１に接続したパルス発信器１０２から制御手段１０３に入力される。
【００５６】
１００は、包材Ｓの材質、幅、膜厚等を指定するキーボードのような包材指定手段で、包材幅等を指定すると、読出手段１０４が作動し、メモリ１０５に格納された各プログラムのうちの対応する１つのプログラム信号を制御回路１０３に出力して実行させる。
【００５７】
他方、制御手段１０３は、パルス発信器１０２からのパルス信号と、包材指定手段１００からの信号が入力すると、旋回アーム１１の角速度を横シール行程の領域において変化させるようその制御信号をモータ駆動手段１０６に出力して、アーム旋回用駆動モータ２９の回転を制御するとともに、旋回アーム１１が第１６図の横シール位置II，II´及びその反対側位置IV，IV´に達する都度、制御信号を第１５図のモータ駆動手段１０７に出力して、アーム昇降用駆動モータ９６の切換えタイミングを制御して、このモータ９６を所定のストローク量Ｌに相当する量だけ回転させるように構成されている。上記移動手段Ｋ及び制御手段１０３がストローク調整手段Ｊを構成している。
【００５８】
つぎにこのように構成された装置の動作について説明する。
はじめに、包材指定手段１００によって使用する包材Ｓの材質や膜厚あるいは包材Ｓの幅等を指定する。
これにより、アーム昇降用駆動モータ９６は、予め設定されたプログラムに従って旋回アーム１１が予め定められた第１６図の基準点Iから横シール行程開始点IIへ回転してきた時点で正転を開始し、包材Ｓの材質等によって定められた量のストロークＬだけ移動枠９０を包材Ｓの移送速度に合せて移送方向Ａに下降させる。
【００５９】
このため、各旋回アーム１１，１１の先端に保持された横シールジョー２０，２０は、指定された包材Ｓの幅、材質または膜厚に応じてストロークＬにわたって包材Ｓの面に接して下方へ走行を始め、 また、 アーム旋回用駆動モータ２９は、これに伴って変動するトルクに応じて回転速度を増減させて包材Ｓに所要の横シールを施す。
【００６０】
そして、横シール行程の終了点II´で所要の横シール処理を終えた各横シールジョー２０，２０がさらに旋回し、やがて半周して最も離れた位置IVへ回ってきたら、アーム昇降用駆動モータ９６は、プログラムにしたがって逆方向の回転を開始して、旋回アーム１１，１１の各支点位置を上昇させて元に戻す。
【００６１】
この第４実施例の構成によれば、一対の横シールジョー２０，２０は、上記第１ないし第３実施例におけるＤ形軌跡とは異なり、半円弧と直線を合わせた単純な軌跡を描くので、制御が容易になる利点がある。なお、以上は、旋回アーム１１の昇降機構として、アーム昇降用駆動モータ９６のネジ棒９７による移動枠９０の昇降機構について説明したものであるが、包材Ｓの材質等によって移動枠９０のストロークＬを変えることができる機構であれば、ラックとピニオン等の他の昇降機構を用いることもできる。
【００６２】
また、この機構において必要がある場合には、アーム昇降用駆動モータ９６が作動している間アーム旋回用駆動モータ２９を停止させ、全シール行程II−II´にわたって横シールジョー２０と包材Ｓとの間の相対的な動きをなくすように制御することもできる。
【００６３】
上記第１ないし第４実施例は、包材Ｓを移送しながらその横シールを行うために、横シールジョーを回転させた回転駆動型であったが、これとは異なり、第１７図の第５実施例では、包材Ｓの移送を間欠的に停止し、停止している閏に包材Ｓの横シールを行う間欠駆動型の横シール機構を用いている。
【００６４】
第１７図に示された横シール機構１０Ａは、外側可動枠３０と内側可動枠３Ａのそれぞれに、旋回アームを介さずに、横シールジョー２０を装着し、シール移動用サーボモータ４０Ａによって、一対の横シールジョー２０，２０を離間、近接させ、近接させた状態で包材Ｓの所定の封止部を挟んで、横シールするものである。その離間、近接させる機構の動作原理は、第３図に示したものと同一である。
【００６５】
上記一対の可動枠３０，３４、ターンバックル３８及びリニアベアリング３２，３６からなる直線・回転変換手段Ｇ、及びシール移動用サーボモータ４０Ａが、圧接力調整手段Ｈ１を構成している。
【００６６】
この第５実施例において、シール移動用サーボモータ４０Ａの速度は、第１８図に示すように、一対の横シールジョー２０，２０が最も離間（後退）した時点ｔ１から包材Ｓに接する時点ｔ２までは正転して、横シールジョー２０，２０を前進させる。この間、上記モータ４０Ａはトルクの如何にかかわらず回転速度が一定となるスピードモードで回転する。
【００６７】
つぎに、上記時点ｔ２から時点ｔ３までのシール行程において、上記サーボモータ４０Ａは一定の設定トルクＴｏとなるように制御される。このとき、第１７図の横シールジョー２０，２０同志の圧接力の反作用によるターンバックル３８の回転トルクが、上記サーボモータ４０Ａに付加されるので、上記ターンバックル３８の回転トルクがサーボモータ４０Ａの上記設定トルクＴｏよりも大きいときはサーボモータ４０Ａが停止し、小さいときはサーボモータ４０Ａが正転または逆転して上記設定トルクＴｏとなるように横シールジョー２０，２０同志を圧接させる。したがって、横シールジョー２０，２０同志の圧接力は、サーボモータ４０Ａの設定トルクＴｏに対応した大きさに制御される。
【００６８】
このように、間欠駆動型の包装機において包材Ｓの停止状態で熱封止を行う際に、上記圧接力調整手段Ｈ１により、上記一対の横シールジョー２０，２０同志の圧接力が所定の大きさに保持されるので、包材Ｓに、その膜厚、材質、膜幅などに応じた適切な横熱封止を施すことができる。しかも、油圧シリンダの代わりにモータ４０Ａを使用しているので、装置が小型化されるうえに、充填物が油で汚れるおそれもなくなる。
なお、この第５実施例における横シールジョー２０にも、第９図〜第１２図に示したのと同様な復帰手段７１，７３，２００を設けることができることはいうまでもない。
【００６９】
また、上記第１〜５実施例では、縦型ピロー包装機に使用される横シール機構について説明したが、本発明の横シール機構は、横型ピロー包装機にも使用できることは自明であるし、さらに、包材を２つに折り畳んで、その合わせ部を縦シールするとともに、２ヶ所の横シールを行う三方シールタイプ、または上記合わせ部と合わせ部の反対側の２ヶ所を縦シールする一方で、２カ所の横シールを行う四方シールタイブのシール装置にも使用できる。本発明は、食品の包装機のほか、工業部品または製品の包装機における横熱封止機構にも利用できる。
【００７０】
【発明の効果】
本発明によれば、包材の移送方向と交差する横方向に封止処理を行う一対の横熱封止手段をサーボモータにより駆動し、包材を一対の横熱封止手段により圧接し、その圧接力を一定となるようにサーボモータのトルクを制御するようにしている。従って、上記一対の横封止手段同志の圧接力が所定の大きさに保持されるので、包材にその膜厚や材質、膜幅などに応じた適切かつ的確な横熱封止を施すことができ、包材に無理な力を加えて破損させたりすることがない。また、上記一対の横熱封止手段をサーボモータにより駆動しているので、油圧シリンダを使用した場合のように充填物を油で汚すことがないので製品の歩留まりが向上する。さらに、油圧シリンダ又はエアシリンダを使用しないのでこれらを駆動するための別機構も必要せず装置自体を小型化することができる。
【図面の簡単な説明】
【図１】第１図は本発明の第１実施例に係る横熱封止手段を備えたピロー包装機を示す斜視図である。
【図２】第２図は同上装置におけるアーム旋回機構の縦断正面図である。
【図３】第３図は同上装置におけるアーム軸移動機構の概要を示した構成図である。
【図４】第４図は同上装置の動作制御回路の一例を示したブロック図である。
【図５】第５ａ図及び第５ｂ図は、同上装置により遂行される「汎横シールモード」での動作タイミングを示した図である。
【図６】第６ａ図及び第６ｂ図は、同上装置により遂行される「両端加減速横シールモード」での動作タイミングを示した図である。
【図７】第７ａ図及び第７ｂ図は、同上装置により遂行される「しごき動作付き横シールモード」での動作タイミングを示した図である。
【図８】第８ａ図及び第８ｂ図は、同上装置により遂行される「しごき動作付き両端加減速横シールモード」での動作タイミングを示した図である。
【図９】第９図は本発明の第２実施例に係る横シール機構の要部を示す縦断正面図である。
【図１０】第１０図は同上装置の原理を示す図である。
【図１１】第１１図は同第２実施例の変形例を示す横シールジョーの概略構成図である。
【図１２】第１２図は同第２実施例の別の変形例を示す横シールジョーの概略構成図である。
【図１３】第１３図は本発明の第３実施例に係る横シール機構を示す概略構成図である。
【図１４】第１４図は本発明の第４実施例に係る横シール機構を備えた包装機を示す斜視図である。
【図１５】第１５図は同上装置の動作制御回路の一例を示すブロック図である。
【図１６】第１６図は同上装置により遂行される動作とタイミングを示した図である。
【図１７】第１７図は本発明の第５実施例に係る装置の要部を示す平面図である。
【図１８】第１８図は同上装置により遂行される動作とタイミングを示した図である。
【符号の説明】
４…プルダウンベルト
１０…横シール機構
１１…旋回アーム
２０…横シールジョー
２９…アーム旋回用サーボモータ
４０…アーム軸移動用サーボモータ
４８…モード指定手段
５３…制御手段[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transverse heat sealing mechanism that is used in a packaging machine that performs packaging in parallel with filling of a filling such as food and performs heat sealing of a packaging material.
[0002]
[Prior art]
A bag making and packaging machine, such as a pillow packaging machine, that fills and packs a food-like filling into the bag while creating the bag, for example, a vertical rim that overlaps while forming a band-like packaging material into a cylindrical shape by a former A pair of transverse heat seals disposed below the outlet end of the filling cylinder that fills the cylindrical packaging material in the process of pulling out the packaging material formed into a cylindrical shape By means, the bottom of the packaging material is sealed, and the device is excellent in workability in that the formation of the packaging material and the filling of the filling material into the packaging material can be performed simultaneously and continuously. Yes.
[0003]
The apparatus disclosed in Japanese Patent Application Laid-Open No. Sho 62-235006 uses a transverse heat sealing means to draw out the packaging material so that a sufficient time can be taken for the transverse heat sealing treatment even when the heat sealing cycle is shortened. It is a so-called rotational drive type in which the heating surface is brought into contact with the packaging material while running linearly along the direction.
[0004]
[Problems to be solved by the invention]
However, this device adopts a structure in which the transverse heat sealing means is guided by the D-shaped guide groove while turning the transverse heat sealing means as means for linearly running the transverse heat sealing means. Since the pressure contact force between the heat sealing means and the transverse heat sealing means is constant, depending on the film thickness, material, and film width of the packaging material, it may be damaged by applying excessive force to the packaging material, or reliable lateral sealing treatment. Inconvenience that it cannot be performed.
[0005]
On the other hand, it is inferior in terms of shortening the heat-sealing cycle, but in an intermittent drive type packaging machine with a simple structure, that is, a packaging machine that pulls the packaging material intermittently and performs transverse heat sealing while the drawing is stopped It is known that the lateral heat sealing means are brought into pressure contact with each other by a hydraulic cylinder, and the pressure contact force can be adjusted by adjusting the oil pressure. However, the hydraulic cylinder may increase the size of the entire apparatus and may contaminate the filler with oil.
[0006]
The present invention has been made in view of such a problem, and in a rotary drive type (swirl type) packaging machine, the pressure contact of the transverse heat sealing means according to the film thickness, material, film width, etc. of the packaging material. It is an object of the present invention to provide a transverse heat sealing mechanism capable of adjusting a force to a predetermined level.
Another object of the present invention is to eliminate the hydraulic cylinder in the intermittent drive type packaging machine, thereby preventing the packaging machine from being downsized and soiling of the filler due to oil.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the bag making and packaging machine according to the invention of claim 1 forms a belt-like packaging material into a bag shape, fills the filling, and then transfers the bag-like packaging material to the bag-like packaging material. In a bag making and packaging machine that performs a sealing process in a transverse direction that intersects the direction, a pair of transverse heat sealing means that performs the sealing process, and the pair of transverse heat sealing means intersect a packaging material transfer direction. A servo motor for driving in the lateral direction; and a control means for controlling the drive of the servo motor, wherein the control means controls the servo motor at a timing when the pair of transverse heat sealing means press-contact the bag-shaped packaging material. The pressure contact force of the transverse heat sealing means is kept constant while maintaining a set torque value. According to this configuration, the press contact force of the transverse heat sealing means is appropriately maintained constant by accurately setting the torque value of the servo motor, so that an excessive force is applied to the bag-like packaging material and it is damaged. It is possible to reliably perform the lateral sealing process without any problem. In addition, since a servo motor is used as a drive source for the transverse heat sealing means, the product yield is not lost because the filling material is not soiled with oil as in the case of using a hydraulic cylinder. improves. Also, since the servo motor is held at the set torque value and the pressure contact force of the transverse heat sealing means is kept constant, there is no need to use a hydraulic cylinder or air cylinder, and no separate mechanism is required to drive them. The device itself can be reduced in size.
[0008]
[0009]
[0010]
[0011]
[0012]
The bag making and packaging machine according to the invention of claim 2 further comprises packaging material designating means for designating characteristics such as the material, film thickness and width of the packaging material according to claim 1, wherein the control means designates the packaging material The servo motor is controlled based on the characteristics of the packaging material designated by the means. Thus, in addition to the effect of the first aspect, the pressure contact force of the transverse heat sealing means is appropriately applied according to the type of packaging material having different film thickness, material, film width, etc., by a simple operation of packaging material designation means. So that the packaging material is not damaged.
[0013]
According to a third aspect of the present invention, there is provided a lateral heat sealing control method for a bag making and packaging machine, in which a band-shaped packaging material is formed into a bag shape and filled with a filling, and then the transfer direction of the bag-shaped packaging material is transferred. A sealing method for a bag making and packaging machine that performs a sealing process in a transverse direction intersecting with a servo motor as a drive source of a pair of lateral heat sealing means for performing the sealing process, The servo motor is switched to torque control at a timing when the pair of transverse heat sealing means presses the band-shaped packaging material, and the pressure contact force of the transverse heat sealing means is maintained constant.
Thereby, the press-contact force of a transverse heat sealing means can be maintained appropriately constant, and appropriate transverse heat sealing can be performed without damaging the packaging material. In addition, since a servo motor is used as a drive source for the transverse heat sealing means, the production yield is improved without causing the product to be wasted by fouling the filler with oil as in the case of using a hydraulic cylinder. To do. Furthermore, since it is not necessary to drive a hydraulic cylinder or an air cylinder, the control is simplified and the apparatus itself can be miniaturized.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a pillow packaging machine having a transverse heat sealing mechanism according to an embodiment of the present invention.
[0015]
This packaging machine is configured as a type of apparatus that does not use a filling cylinder. The former 2 attached below the hopper 1 is used to bend the belt-like packaging material S into a bag to form a bag. While holding the outer surface so that the cylindrical shape is maintained by a pair of pull-down belts 3 and 3 with suction chambers 4 facing downward, a vertical seal by vertical seal jaws 5 is applied to the vertical joint a at the same time. Thus, it is configured to be sent out to a lateral seal mechanism 10 to be described later.
[0016]
On the other hand, the lateral seal mechanism 10 disposed below the pull-down belts 3 and 3 is to seal the packaging material S in the lateral direction intersecting the transport direction, and is opposed to the packaging material S across the transfer path. A pair of front and rear swivel arms (swing drive means) 11 and 11 for rotating the pair of horizontal seal jaws 20 and 20 in a constant direction while being synchronously rotated, and a D-shaped rotation trajectory on the horizontal seal jaws 20 and 20. In order to draw, a pair of left and right outer movable frames 30 and 30 and inner movable frames 34 and 34 for moving the base ends of the respective swing arms 11 and 11 to approach and separate are provided. The swivel arms 11 and 11 swivel so that the transfer direction A of the packaging material S and the swivel direction R coincide when the lateral seal jaws 20 and 20 approach each other.
[0017]
FIG. 2 is a cross-sectional view showing one of the swivel arms 11 and 11 in detail. The swivel arm 11 is formed in a U shape by a coupling shaft 13 that couples the left and right arms 12 and 12. Further, one base end portion of each of the arms 12 and 12 has one movable frame 30, 34, that is, a support shaft 14 projecting inwardly from the distal end of the movable frame 30, 34 located on the left side in the drawing. Further, the base end portion of the other arm 12 is fixed to the input shaft 15 projecting inwardly from the distal ends of the movable frames 30 and 34 located on the right side in the drawing, and the driving force transmitted to the input shaft 15 is fixed. Thus, the shafts 14 and 15 are configured to rotate.
[0018]
Reference numeral 17 denotes a sleeve for supporting a sealing jaw that is loosely fitted to the coupling shaft 13. A lateral sealing jaw 20 for heat-sealing the cylindrical packaging material S in the lateral direction is fixed to the sleeve 17. A planetary gear 21 having the same number of teeth as that of the sun gear 24 is integrally attached to the end, and the sun gear 24 fixed to the end of the fixed shaft 23 that penetrates the support shaft 14 and the idler 22 Meshing.
[0019]
25 and 25 are a well-known pair of Schmitt coupling mechanisms comprising three discs 25a, 25b and 25c coupled via a link 26 (FIG. 1). The first circle of each Schmitt coupling mechanism 25 The plate 25a is coupled to the drive shaft 27 driven by the arm turning servo motor 29, and the third disc 25c is coupled to the input shaft 15 described above, so that the axial center deviation between them is determined. Regardless, the rotation of the drive shaft 27 is transmitted to the input shaft 15 without causing a shift in the rotation angle or a change in the transmission torque. The pair of swivel arms 11 and 11 are configured to rotate in opposite directions with the gears 28 and 28 shown in FIG.
[0020]
On the other hand, the outer movable frame 30 and the inner movable frame 34 that hold the base end portions of the pair of revolving arms 11 and 11 and drive them to approach and separate from each other are respectively connected to the coupling plates fixed to the rear ends. Further, the outer movable frame 30 can be slid back and forth on the main body frame 46, and the inner movable frame 34 can be slid back and forth on the main body frame 46. The outer movable frame 30 is attached so that it can slide back and forth.
[0021]
38 is a turnbuckle for moving the two movable frames 30 and 34 back and forth in relation to each other so that the horizontal seal jaw 20 can draw a required D-shape, that is, a rotation trajectory including a linear trajectory. The turnbuckle 38 is pivotally supported by a frame body 45 provided between the movable frames 30 and 34 as shown in FIG. The turnbuckle 38 is screwed to the right screw portion 38a and the left screw portion 38b via the coupling plates 31 and 35 of the outer movable frame 30 and the inner movable frame 34 or linear bearings 32 and 36, respectively. Then, by the normal rotation and inversion of the turnbuckle 38, the movable frames 30 and 34 are driven in the opposite directions to move the swivel arms 11 and 11 of FIG.
[0022]
The linear bearings 32 and 36 are known ones having a large number of balls meshing with the screw portions 38a and 38b. When the force in the front-rear direction X acts on the movable frames 30 and 34 due to the reaction of the seal pressure, The buckle 38 is rotated, that is, torque is applied to the arm shaft moving motor 40.
The turnbuckle 38 and the linear bearings 32 and 36 convert the relative movement of the pair of movable frames 30 and 34 based on the reaction force of the seal pressure, that is, the reaction force of the pressure contact force of the pair of seal jaws 20 and 20, into a rotational motion. The linear / rotational conversion means G is configured.
[0023]
On the other hand, an AC servo motor that can freely switch between torque control and speed control is used for the arm shaft moving motor 40 coupled to the turnbuckle 38 via the timing belt 39 in FIG. The motor torque can be maintained at a constant set torque regardless of the speed, and the set torque can be appropriately changed. In the speed mode, the rotation speed can be made constant regardless of the torque. It is like that.
[0024]
The arm shaft moving motor 40 is set in conjunction with the arm turning servo motor so that the lateral seal jaws 20 and 20 can draw a linear locus of the set length L (FIG. 5). It is controlled by a control circuit, which will be described later, so that the normal rotation and the reverse rotation can be performed at the same timing.
In FIG. 1, reference numeral 47 denotes a partition plate.
[0025]
FIG. 4 shows a circuit for controlling the arm turning servo motor 29 and the arm shaft moving servo motor 40. FIGS. 5 to 8 show turning in each specified transverse seal mode. The movement of the arm 11 and each operation of the arm turning servo motor 29 and the arm moving servo motor 40 are shown.
Reference numeral 51 in FIG. 4 is an arm rotation angle detecting means for detecting the rotation angle of the turning arm 11 from a certain reference point I based on the rotation of the servo motor 29 for turning the arm, and is proportional to the rotation angle of the turning arm 11. The pulse signal is input to the control means 53 from the pulse transmitter 52 connected to the detection means 51.
[0026]
Reference numeral 48 denotes a mode designation means such as a keyboard for designating a desired horizontal seal mode, and 49 denotes packaging material designation means such as a keyboard for designating the material, film thickness, film width and the like of the packaging material S. By the above-mentioned mode designating means 48, “pan horizontal seal mode” (FIG. 5), “both end acceleration / deceleration horizontal seal mode” (FIG. 6), “lateral seal mode with squeezing operation” (FIG. 7) and “squeezing operation” When one of the horizontal sealing modes such as “Both-end acceleration / deceleration horizontal sealing mode” (FIG. 8) is designated and the packaging material designating means 49 designates the material and width of the packaging material, the reading means 54 From the memory 55, one designated program is read out from each program, which is created for each mode and divided according to the pressure contact force at the time of heat sealing and the difference in stroke length described later. The program signal is output to the control circuit 53 and executed.
[0027]
On the other hand, when the pulse signal from the pulse transmitter 52 and the mode-specific program from the memory 55 are input to the control means 53, the general-purpose mode setting means 53a, the acceleration / deceleration mode setting means 53b, and the ironing are selected according to the mode. The mode setting means 53c and the like operate. Thereby, the control means 53 outputs the control signal to the motor drive means 56 so as to change the angular velocity of the turning arm 11 in the region of the lateral seal stroke, and controls the rotation of the arm turning servomotor 29, and The control signal is output to the motor driving means 57 so as to change the rotation center position of the swivel arm 11 in the region of the horizontal seal stroke, and the switching timing of the arm shaft moving servo motor 40 is controlled.
[0028]
The movable frames 30 and 34, the linear / rotation conversion means G, the arm shaft moving servo motor 40, and the control means 53 constitute a locus / pressure contact force adjusting means H.
Further, since the length (stroke length) of the horizontal seal stroke is changed by moving the rotation center of the swivel arm 11, the movable frames 30, 34, arm axis movements, excluding the linear / rotation conversion means G, are changed. The servo motor 40 and the control means 53 also constitute a stroke adjusting means J.
[0029]
Next, the operation of the apparatus configured as described above will be described.
First, for example, the “wide transverse seal mode” in which the length of the transverse seal process as shown in FIG. 5a is LI is designated by the mode designating means 48 in FIG. The material and film thickness of the material S are designated.
[0030]
As a result, among the many programs stored in the memory 55, the pan-lateral seal mode program corresponding to the material and film thickness of the packaging material S is read by the reading means 54. In accordance with the read program, the general-purpose mode setting means 53a is operated, and the arm axis moving servo motor 40 is rotated when the swivel arm 11 of FIG. 5a rotates from the reference point I to the lateral seal stroke start point II. First, the forward rotation operation is performed, and then the reverse rotation operation is performed from the middle point III to the lateral seal stroke end point IV, and the pair of revolving arms 11 are interposed via the outer movable frame 30 and the inner movable frame 34 that are screwed into the turnbuckle 38. , 11 are separated and brought close to each other. At this time, the packaging material S is sandwiched between the pair of horizontal seal jaws 20 and 20 and moves at the same speed as the transfer speed.
[0031]
For this reason, the lateral seal jaws 20 and 20 held at the tips of the revolving arms 11 and 11 start to run in contact with the packaging material S surface, that is, along a linear locus. At this time, the arm shaft moving servo motor 40 is torque-controlled, and as shown in FIG. 5b, a constant set torque To is maintained. The pressure contact force of 20 is kept as constant as possible. On the other hand, the arm turning servo motor 29 moves the horizontal seal jaws 20 and 20 along the packaging material S while increasing or decreasing the rotational speed of the turning arm 11 according to the applied torque, and is required for the packaging material S. Apply the horizontal seal. At this time, the rotational center of the swivel arm 11 of the lateral seal jaw 20 in FIG. 5a is balanced with the rotational torque of the turnbuckle 38 due to the reaction of the pressure contact force and the set torque To of the servo motor 40, that is, the pressure contact. It moves in the front-rear direction X while keeping the force constant. By changing the set torque To of the servo motor 40, the constant value of the pressure contact force changes.
[0032]
In this “pan-lateral seal mode”, for example, when the second pan-lateral seal mode having a short length (L2) of the horizontal seal stroke, that is, the stroke length is designated, is shown in FIGS. 5a and 5b. As indicated by the two-dot chain line, at the beginning of the operation of the apparatus, the arm shaft moving motor 40 rotates forward in accordance with the program, moves the rotation center of the swivel arm 11 to O ′, and then, the lateral seal stroke start point II And the end seal IV, the side seal jaw 20 is caused to make a short straight run.
[0033]
When the “both-end acceleration / deceleration horizontal seal mode” is specified in which the horizontal seal jaw 20 is accelerated before the start position of the horizontal seal and decelerated after the end position, the acceleration / deceleration mode setting means 53b is activated. Then, as shown in FIG. 6, before reaching the lateral seal start point II, the arm shaft moving servo motor 40 is gradually accelerated so that the respective rotation center positions of the swivel arms 11 and 11 are set to 0 from O in advance. ′ Is gradually separated, and after reaching the speed at the horizontal seal start point II and reaching the end point IV, the motor 40 is gradually decelerated, so that the acceleration region II′-II and the deceleration respectively. The operation is performed according to a program capable of creating the region IV-IV ′.
Thereby, the rapid separation at the lateral seal start point II and the rapid approach at the lateral seal end point IV between the pair of swing arms 11 and 11 are eliminated, and the operation of the lateral seal mechanism 10 becomes smooth.
[0034]
On the other hand, a “lateral seal mode with a squeezing operation” as shown in FIG. 7 is performed so that the filler in the packaging material S is not caught in the lateral seal portion prior to the lateral seal. "Is designated, the ironing mode setting means 53c operates. As a result, the control means 53 applies the ironing plate 61 to the packaging material S by the spring 60 at the ironing start point II ′ slightly earlier than the horizontal seal starting point II, with the swivel arms 11 and 11 being separated from each other. After squeezing the packaging material S by running it faster than the transfer speed of the packaging material S to the position III, the rotational center of the swivel arm 11 is moved from B to C, and the lateral seal jaws 20, 20 are pressed against each other. Thereafter, the apparatus is operated in accordance with a program for moving the lateral seal jaws 20 and 20 at the same speed as the transfer speed of the packaging material S while controlling the torque of the arm shaft moving servo motor 40 to the lateral seal end point IV. . As a result, the filling material is prevented from biting into the lateral seal portion, and the lateral seal is ensured.
[0035]
Furthermore, when “both-side acceleration / deceleration lateral seal mode with squeezing operation” as shown in FIG. 8 is designated, the acceleration region is set before the start point II of the ironing stroke and after the end point IV of the horizontal seal stroke. The apparatus is operated according to a program that can have II′-II and deceleration region IV-IV ′.
[0036]
As described above, in the embodiment shown in FIGS. 1 to 8, the pair of lateral sealing jaws (lateral thermal sealing means) 20, 20 is provided in the transfer path of the packaging material S by the locus / pressure contact adjusting means H. Since a straight locus along the line is drawn, transverse heat sealing can be applied to the packaging material S that is continuously transferred. Further, the pressure contact force between the pair of lateral seal jaws 20 and 20 is maintained at a magnitude corresponding to the set torque To of the arm shaft moving motor (approaching / separating moving motor) 40, so , Appropriate transverse heat sealing according to the film thickness and material can be applied.
[0037]
Furthermore, since the stroke adjusting means J sets the stroke length according to the film thickness and material of the packaging material S, that is, the heat sealing treatment time, the packaging material S can be subjected to more appropriate transverse heat sealing. it can.
[0038]
The trajectory / pressing force adjusting means H has a function of forming a predetermined trajectory of the pair of lateral seal jaws 20 and 20, and a function of holding the press contact force of the pair of lateral seal jaws 20 and 20 constant. Therefore, the entire apparatus is simplified as compared with the case where these functions are performed by separate mechanisms. In addition, since the motor 40 is used instead of the hydraulic cylinder, the apparatus is miniaturized and there is no possibility that the filler is contaminated with oil.
[0039]
Further, the pair of movable frames 30 and 34, the arm shaft moving motor 40, and the control means 53 that form a part of the locus / pressure contact adjusting means H also serve as the stroke adjusting means J. Therefore, the apparatus is simplified.
The linear / rotation conversion means G can be constituted by a link mechanism or a groove cam in addition to the mechanism using the linear bearings 32 and 36 and the turnbuckle 38.
[0040]
FIG. 9 shows a second embodiment in which the support structure of the lateral seal jaw 20 is improved and a return means is added. In the figure, the base ends of the support springs 71 and 71 (return means) are fixed to the inner ends of the pair of sleeps 17 and 17 loosely fitted to the coupling shaft 13 that couples the left and right arms 12 and 12, respectively. ing. The support springs 71 and 71 are for applying a uniform pressing force to the entire width direction W of the packaging material S. The support springs 71 and 71 are configured as cantilever beams and are arranged so as to face each other. A lateral seal jaw 20 for performing lateral seal on the packaging material S is fixed to these free ends extending toward the direction.
[0041]
As a result, when the horizontal seal jaws 20 are in pressure contact with each other in the sealing process, even if the horizontal seal jaws 20 are tilted in a seesaw shape due to the vertical seal portion of the intervening packaging material S, the respective support While the springs 71 and 71 are independently bent, the transverse seal jaw 20 is returned toward the opposite transverse seal jaw 20 by a reaction force proportional to the amount of strain, and a uniform pressing force is applied to the packaging material S.
[0042]
In the apparatus configured as described above, the pair of lateral seal jaws 20 and 20 is swung in a D-shape by the rotation of the arm 12 of the revolving arm 11 and the advance and retreat of the two movable frames 30 and 34 synchronized therewith. When the horizontal seal region is reached while moving and joined together so as to sandwich the wrapping material S fed there, the horizontal seal jaws 20 and 20 are displaced with the vertical seal portion as a fulcrum. Force acts.
[0043]
When such a force is applied to the lateral seal jaw 20, the left and right support springs 71 and 71 that support the flexure are deflected according to the displacement amount of the lateral seal jaw 20, and at the same time, the reaction is proportional to the deflection amount. While applying a force in the return direction to the horizontal seal jaw 20 with force, a uniform pressing force is applied to the packaging material S to perform a horizontal seal.
[0044]
This will be described in more detail with reference to FIG. 10. Now, when the packaging material S with the central vertical seal portion a having three layers and four layers is sandwiched between the pair of horizontal seal jaws 20 and 20, at least one of the horizontal seal jaws. 20 is inclined in a seesaw shape with the vertical seal portion a as a fulcrum, or this inclination appears as a deformation of the left and right support springs 71, 71.
The amount of deformation (strain) δ is as follows. The effective length of the support spring 71 forming the cantilever is D, the plate thickness is t, the plate width is b, and the applied load is 2p.

The reaction force R is inversely proportional to the strain δ.
R = E × b × t × t × t × δ / (D × D × D) (2)
It becomes. Here, E and I are the Young's modulus and the moment of inertia of the support spring 71, respectively.
[0045]
Accordingly, the left and right support springs 71 and 71 press the respective support portions of the lateral seal jaw 20 toward the counterpart lateral seal jaw 20 with reaction forces Rl and Rr proportional to the displacement amounts δl and δr, respectively. Return.
Now, as an example, a load of 500 kg acts on the support spring 71 having an effective length D of 44 mm, a plate thickness t of 5 mm, a plate width b of 18 mm, and a Young's modulus of 2.1 × 10 kg / mm 2, thereby supporting the left and right supports. Assuming that the springs 71 and 71 are deformed by 0.5 mm and 0.4 mm, respectively, from the equation (2), the left support spring 71 has its reaction force Rl = 278 Kg, and the right support spring 71 has its pressure Rr. = 222 kg, the lateral seal jaw 20 is pressed in the return direction to compensate for the displacement, and the packaging material S is subjected to a laterally uniform lateral seal.
[0046]
FIG. 11 shows a modification of the support spring. In the figure, slits 72, 72 directed inwardly are formed on both sides of the lateral seal jaw 20A, and a portion separated from the main body of the lateral seal jaw 20A by this slit 72 is a support spring having cantilever-like elasticity. The parts 73 and 73 are configured.
[0047]
Further, in the modification shown in FIG. 12, the case 200 of the lateral seal jaw 2OB is configured as a hollow elastic body, and a reaction force proportional to the amount of bending of the case 200 itself is applied so that the displacement of the lateral seal jaw 2OB is reduced. At the same time, a fluid 75 that melts at a low temperature such as lead is sealed in the hollow portion 74 so that the horizontal sealing jaw 2OB has a uniform thermal balance. You can also. In this case, the case 200 constitutes a return means.
The spring members 71 and 73 or the hollow elastic body 2OB can be applied only to one side seal jaw.
[0048]
FIG. 13 shows a third embodiment of the present invention.
In this embodiment, a horizontal seal jaw 20 and a squeezing plate 61 are provided at the tip of the revolving arm 11, and the squeezing operation is performed on the packaging material S by the squeezing plate 61 in the first half of the straight traveling section I → III. In the latter half of the section I → III, the lateral seal operation for the packaging material S is performed by the lateral seal jaw 20. That is, in this embodiment, different guides are used as means for drawing various D-shaped trajectories that cause the horizontal seal jaw 20 to vary the length of the linear travel trajectory (the stroke length of the seal), that is, the axis moving means of the swivel arm 11. The two arm shaft moving cams 84A and 84B having a face are coaxially mounted so that the relative rotational direction position can be adjusted and rotated. On the other hand, in the lateral seal stroke II-III, both the seal jaws 20 and 20 are rotated. One or both of the camshafts 85 (right camshaft 85 in this embodiment) is urged toward the other camshaft 85 by the air cylinder 86 so that the pressure contact force suitable for the packaging material S can be applied to the camshaft 85. It is comprised so that it may do.
[0049]
An air supply pipe from the air supply source 87 to the air cylinder 86 includes an electromagnetic valve 88 that opens the pipe only in the lateral seal stroke II-III, and an external pilot that operates when the contact pressure exceeds the set pressure. A type sequence valve 89 is provided to perform horizontal sealing with a constant pressure contact force, while the arm turning servo motor is controlled to increase the rotational speed in the ironing process I-II. The squeezing operation is quickly finished before the sealing operation.
In the third embodiment, the transverse seal jaws 20 and 20 are moved to the first half of the straight traveling section, that is, the ironing process I-II by the arm turning servo motor and the arm shaft moving cams 84A and 84B interlocked therewith. Then, the arm shaft moving cams 84A and 84B separate the swivel arms 11 and 11 while the air cylinder 86 is inoperative, and at the same time increase the rotation speed of the arm swiveling servo motor to wrap the ironing plates 61 and 61. While traveling linearly at a speed faster than the conveying speed of the material S, the necessary ironing operation is performed on them.
[0050]
Next, when the lateral seal jaws 20 and 20 enter the lateral seal stroke II-III, the servo motor for turning the arm is returned to a constant rotation and the electromagnetic valve 88 is opened, and air is supplied via the external pilot type sequence valve 89. Introduced into the air cylinder 86, the arm shaft moving cams 84A and 84B are pressed toward the other cams 84A and 84B with a preset pressure, and the film thickness of the packaging material S is applied to the lateral seal jaws 20 and 20. A pressing force corresponding to the material and the material is applied to perform a required sealing operation.
The ironing stroke I-II is controlled by one cam 84B, and the lateral sealing stroke II-III is controlled by the other cam 84A. Therefore, the stroke lengths of the two strokes I-II and II-III are changed by changing the relative rotational direction positions of the cams 84A and 84B.
In this third embodiment, the two cams 84A and 84B are used as the arm shaft moving means, but this can be replaced with other shaft moving means using an air cylinder or the like.
[0051]
FIG. 14 shows a fourth embodiment of the present invention, in which a moving means K for moving the swivel arm 11 supporting the horizontal seal jaw 20 in the transfer direction A of the packaging material S by a predetermined stroke is provided during the horizontal seal. It is a thing. That is, the pair of side plates 91 and 92 holding the base ends of the pair of swivel arms 11 and 11 are coupled by the coupling plates 93 and 94 fixed to the front end and the rear end thereof, and the swivel arms 11 and 11 are combined. The movable frame 90 is configured so as to be slid up and down while being guided by four guide rods 95 erected on the main body frame 46. It has been.
[0052]
Reference numeral 96 denotes a drive motor (for moving the movable frame 90 up and down to draw a required elliptical locus on the horizontal seal jaw 20).Motor for vertical movementThe drive motor 96 is an AC servo motor that can switch the rotation direction at a predetermined timing. The moving frame 90, the guide rod 95, and the drive motor 96 constitute the moving means K.
[0053]
Whenever the lateral seal jaws 20 and 20 reach the vicinity of the joining position and the maximum separation position, the drive motor 96 is rotated forward and reverse by the control means described later, and screwed with the screw rod 97 forming the drive shaft. Via the bracket 98 on the moving frame 90, the swivel arms 11, 11 are configured to be driven up and down with a set amount of stroke. Other structures are the same as those of the first embodiment shown in FIGS. 1 and 2 except that the arm horizontal movement mechanism shown in FIG. 3 is not provided.
[0054]
FIG. 15 shows a circuit for controlling the arm turning drive motor 29 and the arm raising / lowering drive motor 96, and FIG. 16 shows the relationship between the arm turning drive motor 29 and the arm raising / lowering drive motor 96. The movement of the swivel arm 11 by operation is shown.
[0055]
Reference numeral 101 in FIG. 15 is an arm rotation angle detection means for detecting the rotation angle of the swing arm 11 from a certain reference point I based on the rotation of the arm rotation drive motor 29. A proportional pulse signal is input to the control means 103 from a pulse transmitter 102 connected to the detection means 101.
[0056]
Reference numeral 100 denotes a packaging material designating means such as a keyboard for designating the material, width, film thickness, etc. of the packaging material S. When the packaging material width is designated, the reading means 104 is activated and each program stored in the memory 105 is designated. One of the corresponding program signals is output to the control circuit 103 and executed.
[0057]
On the other hand, when the pulse signal from the pulse transmitter 102 and the signal from the packaging material specifying means 100 are input, the control means 103 drives the control signal to change the angular velocity of the swivel arm 11 in the region of the lateral seal stroke. Output to the means 106 to control the rotation of the arm turning drive motor 29, and each time the turning arm 11 reaches the transverse seal positions II and II 'and the opposite positions IV and IV' in FIG. 15 is output to the motor drive means 107 in FIG. 15 to control the switching timing of the arm raising / lowering drive motor 96 and rotate the motor 96 by an amount corresponding to a predetermined stroke amount L. . The moving means K and the control means 103 constitute a stroke adjusting means J.
[0058]
Next, the operation of the apparatus configured as described above will be described.
First, the material and film thickness of the packaging material S to be used or the width of the packaging material S is designated by the packaging material designating means 100.
As a result, the arm raising / lowering drive motor 96 starts normal rotation when the swivel arm 11 rotates from the predetermined reference point I in FIG. 16 to the lateral seal stroke start point II in accordance with a preset program. The moving frame 90 is lowered in the transfer direction A in accordance with the transfer speed of the packaging material S by an amount of stroke L determined by the material of the packaging material S and the like.
[0059]
For this reason, the horizontal sealing jaws 20 and 20 held at the tips of the swivel arms 11 and 11 are in contact with the surface of the packaging material S over the stroke L according to the width, material, or film thickness of the designated packaging material S. The arm turning drive motor 29 starts running downward and increases or decreases the rotational speed in accordance with the torque that fluctuates therewith, and applies the required lateral seal to the packaging material S.
[0060]
Then, at the end point II ′ of the horizontal seal stroke, the horizontal seal jaws 20 and 20 that have finished the required horizontal seal processing are further swung, and eventually turn halfway around to the most distant position IV. 96 starts rotation in the reverse direction according to the program, and raises and returns the respective fulcrum positions of the swing arms 11, 11.
[0061]
According to the configuration of the fourth embodiment, the pair of lateral seal jaws 20 and 20 draws a simple trajectory combining a semicircular arc and a straight line, unlike the D-shaped trajectory in the first to third embodiments. There is an advantage that the control becomes easy. In addition, the above is a lifting mechanism of the swivel arm 11.Arm lift drive motorAlthough the lifting mechanism of the moving frame 90 by the 96 screw rods 97 has been described, other mechanisms such as a rack and a pinion can be used as long as the mechanism can change the stroke L of the moving frame 90 depending on the material of the packaging material S or the like. An elevating mechanism can also be used.
[0062]
Further, when necessary in this mechanism, the arm turning drive motor 29 is stopped while the arm raising / lowering drive motor 96 is operating, and the transverse seal jaw 20 and the packaging material S are used over the entire sealing process II-II ′. It is also possible to control so as to eliminate relative movement between the two.
[0063]
In the first to fourth embodiments, the lateral seal jaws are rotated in order to perform the lateral seal while the packaging material S is being transferred. In the fifth embodiment, an intermittent drive type lateral seal mechanism is used in which the transport of the packaging material S is intermittently stopped, and the lateral sealing of the packaging material S is performed on the stopped saddle.
[0064]
In the lateral seal mechanism 10A shown in FIG. 17, a lateral seal jaw 20 is attached to each of the outer movable frame 30 and the inner movable frame 3A without using a swivel arm, and a pair of servomotors 40A for moving the seal are used. The horizontal sealing jaws 20 and 20 are separated and brought close to each other, and in a state of being brought close to each other, a predetermined sealing portion of the packaging material S is sandwiched between them to perform horizontal sealing. The operating principle of the mechanism for separating and approaching is the same as that shown in FIG.
[0065]
The linear / rotational conversion means G including the pair of movable frames 30 and 34, the turnbuckle 38 and the linear bearings 32 and 36, and the seal moving servo motor 40A constitute a pressure contact force adjusting means H1.
[0066]
In this fifth embodiment, the speed of the servo motor 40A for moving the seal is such that the pair of lateral seal jaws 20 and 20 come in contact with the packaging material S2 from the time t1 when the pair of lateral seal jaws 20 and 20 are most separated (retracted), as shown in FIG. Until then, the transverse seal jaws 20, 20 are moved forward. During this time, the motor 40A rotates in a speed mode in which the rotation speed is constant regardless of the torque.
[0067]
Next, in the sealing process from the time point t2 to the time point t3, the servo motor 40A is controlled to have a constant set torque To. At this time, the rotational torque of the turnbuckle 38 due to the reaction of the pressure contact force between the horizontal seal jaws 20 and 20 shown in FIG. 17 is applied to the servomotor 40A, so that the rotational torque of the turnbuckle 38 is applied to the servomotor 40A. When the set torque To is greater than the set torque To, the servo motor 40A is stopped. When the set torque To is smaller, the servo motor 40A is rotated forward or reverse to bring the lateral seal jaws 20 and 20 into pressure contact so that the set torque To is reached. Accordingly, the pressure contact force between the lateral seal jaws 20 and 20 is controlled to a magnitude corresponding to the set torque To of the servo motor 40A.
[0068]
Thus, when heat sealing is performed with the packaging material S stopped in the intermittent drive type packaging machine, the pressure contact force adjusting means H1 causes the pressure contact force between the pair of lateral seal jaws 20 and 20 to be a predetermined value. Since the size is maintained, the packaging material S can be subjected to appropriate transverse heat sealing according to its film thickness, material, film width, and the like. In addition, since the motor 40A is used instead of the hydraulic cylinder, the apparatus is miniaturized and there is no possibility that the filler is contaminated with oil.
Needless to say, return means 71, 73, and 200 similar to those shown in FIGS. 9 to 12 can also be provided in the lateral seal jaw 20 in the fifth embodiment.
[0069]
Moreover, in the said 1st-5th Example, although the horizontal seal mechanism used for a vertical pillow packaging machine was demonstrated, it is obvious that the horizontal seal mechanism of this invention can be used also for a horizontal pillow packaging machine, Furthermore, the packaging material is folded in two and the mating part is vertically sealed, and the three-way seal type that performs two horizontal seals, or the two parts on the opposite side of the mating part and the mating part are vertically sealed. It can also be used in a four-way seal type sealing device that performs two horizontal seals. The present invention can be used not only for food packaging machines but also for transverse heat sealing mechanisms in industrial parts or product packaging machines.
[0070]
【The invention's effect】
According to the present invention, a pair of transverse heat sealing means for performing a sealing process in the transverse direction intersecting with the packaging material transfer direction is driven by a servo motor, and the packaging material is pressed by the pair of transverse heat sealing means, The torque of the servo motor is controlled so that the pressure contact force is constant. Accordingly, since the pressure contact force between the pair of lateral sealing means is maintained at a predetermined magnitude, the packaging material is subjected to appropriate and accurate lateral heat sealing according to the film thickness, material, film width, etc. It does not damage the packaging material by applying excessive force.In addition, since the pair of transverse heat sealing means is driven by a servo motor, the filling material is not soiled with oil as in the case of using a hydraulic cylinder, so that the yield of products is improved. Furthermore, since a hydraulic cylinder or an air cylinder is not used, a separate mechanism for driving them is not required, and the apparatus itself can be miniaturized.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a pillow packaging machine equipped with a transverse heat sealing means according to a first embodiment of the present invention.
FIG. 2 is a longitudinal sectional front view of an arm turning mechanism in the apparatus.
FIG. 3 is a block diagram showing an outline of an arm shaft moving mechanism in the apparatus.
FIG. 4 is a block diagram showing an example of an operation control circuit of the apparatus.
FIGS. 5a and 5b are diagrams showing the operation timing in the “pan-lateral seal mode” performed by the apparatus.
FIGS. 6a and 6b are diagrams showing operation timings in a “both-end acceleration / deceleration lateral seal mode” performed by the apparatus.
FIGS. 7a and 7b are diagrams showing the operation timing in the “lateral seal mode with squeezing operation” performed by the apparatus.
FIGS. 8a and 8b are diagrams showing operation timings in the “both end acceleration / deceleration horizontal seal mode with squeezing operation” performed by the apparatus.
FIG. 9 is a longitudinal front view showing a main part of a horizontal seal mechanism according to a second embodiment of the present invention.
FIG. 10 is a view showing the principle of the apparatus.
FIG. 11 is a schematic configuration diagram of a lateral seal jaw showing a modification of the second embodiment.
FIG. 12 is a schematic configuration diagram of a lateral seal jaw showing another modification of the second embodiment.
FIG. 13 is a schematic configuration diagram showing a lateral seal mechanism according to a third embodiment of the present invention.
FIG. 14 is a perspective view showing a packaging machine provided with a lateral seal mechanism according to a fourth embodiment of the present invention.
FIG. 15 is a block diagram showing an example of an operation control circuit of the apparatus.
FIG. 16 is a view showing operations and timings performed by the apparatus.
FIG. 17 is a plan view showing an essential part of an apparatus according to a fifth embodiment of the present invention.
FIG. 18 is a diagram showing operations and timings performed by the apparatus.
[Explanation of symbols]
4 ... Pull-down belt
10 ... Horizontal seal mechanism
11 ... Swivel arm
20 ... Horizontal seal jaw
29 ... Servo motor for arm rotation
40 ... Servo motor for arm axis movement
48 ... Mode designation means
53. Control means

Claims (3)

After the strip of packaging material filled with filler by forming a bag shape, the bag making and packaging machine that performs a sealing process in the transverse direction intersecting the transport direction against the said bag-shaped packaging material, the sealing A pair of transverse heat sealing means for processing;
A servo motor that drives the pair of transverse heat sealing means in a transverse direction intersecting with the direction of transport of the packaging material;
Control means for controlling the drive of the servo motor,
The control means maintains the pressure contact force of the transverse heat sealing means constant by holding the servo motor at a set torque value at a timing when the pair of transverse heat sealing means presses the bag-shaped packaging material. Characteristic bag making and packaging machine. 2. The packaging material designating means for designating characteristics such as the material, film thickness and width of the packaging material according to claim 1, wherein the control means controls the servo motor based on the characteristics of the packaging material designated by the packaging material designating means. A packaging machine characterized by controlling . After forming a band-shaped packaging material into a bag shape and filling the filling material, the bag-shaped packaging material is sealed in a transverse direction intersecting the transfer direction. Stop method,
A servo motor is used as a drive source of the pair of transverse heat sealing means for performing the sealing process, and the servo motor is switched to torque control at a timing when the pair of transverse heat sealing means presses the band-shaped packaging material. A transverse heat sealing control method for a bag making and packaging machine, wherein the pressure contact force of the transverse heat sealing means is maintained constant.

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