JP3944416B2

JP3944416B2 - Bag mouth sealing device

Info

Publication number: JP3944416B2
Application number: JP2002160872A
Authority: JP
Inventors: 純彰黒川
Original assignee: Furukawa Mfg Co Ltd
Current assignee: Furukawa Mfg Co Ltd
Priority date: 2002-06-03
Filing date: 2002-06-03
Publication date: 2007-07-11
Anticipated expiration: 2022-06-03
Also published as: JP2004001855A

Description

【０００１】
【発明の属する技術分野】
本発明は包装用袋の開口縁を加熱溶着するための、ベルトコンベヤ式シール装置に関する。
【０００２】
【発明が解決しようとする課題】
積み重ねた包袋を１枚づつ機械的に取り出し且つ無端軌道に沿って運搬すると共に、運搬中の包袋にオートチェッカーにより被包装物を順次投入しあと、前記各包袋の袋口をシールバーによって次々と加熱溶着する自動機の、包装業界における浸透度は極一般化しているが、例えば漬物葉や粘性のある煮豆のような容積計量に適さず又袋詰め自動化に不向きな被包装物は、作業員の手で袋詰めし、また計量を行なう現状であるので、この種の包袋のシールも一般的にはベルトコンベヤ上に多数の包袋を並列載置し、前記各包袋をベルトコンベヤでもって並列移送しながらシールする装置を使用する。
【０００３】
前記のベルトコンベヤ式シール装置は、エンドレスベルトに設置する棒状シール台を、前記ベルトを支持するロールつまりプーリの軸線と平行配置し、同シール台上に袋口を揃え配置した５、６個程度の包袋を一斉に並列移送し、移送軌道上域に配置したシールバーを前記シール台上の各袋口に押し当てて加熱シールする構成が一般的であるが、例えば沢庵漬けのような棒状物の包袋はそれなりの長さを備えるから、この種包袋のシールを前記の装置で行なうようにすると、ベルト上の各シール台のピッチは必然大きくなるという問題があり、従ってこの種包袋のシールは、ベルトに対しシール台を、プーリの軸線と交差する方向に固定したベルトコンベヤを使用する(実開昭５９−９４００４参照)。
【０００４】
しかしプーリの軸線と交差する方向にシール台を固定するベルトコンベヤでは、図１２に示すごとくベルト１がそれを支えるプーリ２の回りを迂回するとき、前記ベルトに固定したシール台３は、ベルト１に固定された同下面に比べて上面が一方的に延伸して材料疲労が生ずるので、同上面に細かい分割処理４が必要になり、この結果袋口に均等なシール圧を得られないという問題がある。またシール台に包袋から溶け出すプラステイック溶融膜が付着するのを防止するためのテフロン（登録商標）テープを被せるが、上下面に伸び量の差が生ずるシール台に前記のテフロン（登録商標）テープの使用は適正でないという問題もある。
【０００５】
他例としてベルト１とシール台３とを一体化せず、ベルト１と一体に移動する包袋の袋口を、不動のシール台３上に座礁させたあと、上部からのシールバーの下降で前記袋口を加熱シールする技術も開示されるが、ベルト１上に配置する包袋の位置決めは必然不正確になるので、搬入する各包袋の袋口縁とシール台３の端辺とが揃わず、結果として各包袋相互の各シール痕跡が不規則になる欠点がある。
【０００６】
【その解決手段】
本発明は、以上の各問題を解決することを目的とするもので、一対のプーリ１１、１２で支持するエンドレスベルト１０上の、前記プーリ１１の軸線と交差する方向のシール台１６に袋口を載置する包袋１７を、前記ベルト１０と一体に断続移送し、シールバー配置域において前記シール台１６に向けて下降するシールバーにより前記包袋１７の袋口を挟圧して溶融するシール機構であって、フレキシブル材により形成した前記シール台１６の両端局部を前記ベルト１０に固着する一方、前記シール台１６の両端固着部内側領域に、同シール台１６に沿って前記ベルト１０に落し穴３５を形成して構成する。
【０００７】
しかして一般的にはベルト１０をゴムのような可撓性の板によって形成するが、一対のプーリ１１、１２の回りを同ベルト１０と一体に巡回するシール台１６をフレキシブル材により形成しているので、プーリ１１の外側をシール台１６は柔軟に可曲してUターンすることになり、この場合同シール台１６はベルト１０の落し穴３５に沈みながら可曲する。既に説明したように図１２に示す従来技術ではシール台３の内面がベルト１に固着する関係で、同外面が必然的に引き伸ばされ、仮にテフロンテープを貼り付けていると、同テフロンテープを引き剥がすことになったが、シール台１６をベルト１０の落し穴３５に沈ませて同シール台１６の外面の延伸現象をなくしたので、シール台１６の小刻みな分割の必要はなくなり、またテフロンテープの強制剥離を解消することが可能になるのである。
【０００８】
なおシール台１６の高さ方向の厚みの大小によっては、シール台内面に対する同外面の延伸率が拡大するので、この場合はシール台１６をプーリ１１に形成する落し輪溝３６内にも沈めてシール台１６の外面延伸現象を押えることができる。また別例として、図１０のごとくシール台５０の両端局部下にそれぞれ橋脚５３を形成し、これら両橋脚５３間においてシール台下側に退避間隙５２を形成することにより、ベルト５５と一体にプーリの外をUターンするときシール台５０を、前記の退避間隙５２の範囲で沈め、同シール台５０外面の延伸現象を押えることができる。
【０００９】
【発明の実施形態】
図３に示すベルトコンベヤ式のシール機構は、一対の丸棒型プーリ１１、１２の回りにエンドレスベルト１０を張設する一方、前記ベルト１０の上域に箱型の耐圧チャンバー１３を配置して構成するもので、モータ１４の動力で前記ベルト１０を矢印１５に向け設定量だけ移動すると、前記プーリ１１の軸線に交差する方向に向けベルト１０に固定したシール台１６は、前記耐圧チャンバー１３の下に潜りこむので、同耐圧チャンバー１３が下降してベルト１０に密着すると、シール台１６に袋口を揃え配置した所定数の包袋１７は、ベルト１０と耐圧チャンバー１３とが囲む気密室の真空環境下で袋口を溶融密封されるのである。
【００１０】
図４は前図の側面を表し、前記両プーリ１１、１２の両端をそれぞれ軸受１８を介して機台１９に固定する一方、耐圧チャンバー１３の対称部に固定し且つ垂下するラック歯２０を、前記機台１９に立設したブラケット２１が支持するピニオン２２に係合し、該ピニオン２２の回転で前記耐圧チャンバー１３の上下運動を操作する構成で、さらに前記機台１９の前後面中心から突き出る一対のピン２３をそれぞれ軸受２４を介しベース２５に支持すると共に、前記機台１９とベース２５とを連結ねじ２６を介して結合し、図５に示す耐圧チャンバー１３の上面に設置したシリンダ２８により、シールバー２９をシール台１６上の包袋１７の開口縁に押し下げて溶融シールするのである。なお包袋１７の内部に収容する被包装物が粉粒体または液体のごとく袋口から溢れる可能性の高い場合、図４の連結ねじ２６の締込みで、機台１９を、被包装物が包袋１７の外に零れにくい方向に傾むけことができる。
【００１１】
図６に示すごとくフレキシブルシール台１６の両端をビス２７でもっ固定するベルト１０は、前記シール台を沈めるために同シール台１６に沿って落し穴３５を切り抜き形成し、また図２に図示するようにプーリ１１、１２は前記落し穴３５と沿う位置に落し輪溝３６を形成する。この結果、図１に示すようにシール台１６がプーリ１１の回りをUターンするとき、前記落とし穴３５にシール台１６の内面は開放されて可曲時の、前記内面の収縮が容易になるので、同シール台の外面は一方的に延伸することがなくなると共に、前記シール台は落し穴３５内に沈み込み、或いはまた同シール台１６の高さ方向の厚み数値によっては前記落し輪溝３６にも沈み込むのである。
【００１２】
図５に示すように耐圧チャンバー１３の下域には、場合によっては前記耐圧チャンバーの下降圧を支える架橋型定盤３７の設置が必要であるが、シールバー２９はその下降圧によってフレキシブルシール台１６を、落し穴３５を通して定盤３７の上面まで押し下げるので、包袋に対するシール圧の不足現象が生ずることになり得る。そこで、かかる現象防止のため図７は、シール台１６の下面に、ベルト１０の厚み、つまり落し穴３５の深さ分に相当する高さのフレキシブル下駄歯３８を一体形成する(図８をも参照)。結果的に前記下駄歯３８は定盤３７に接地してシールバーの下降圧に対抗する。
【００１３】
図９は、ベルト１０とシール台１６とが一体に横移動する間、下降退避する定盤３７の、落し穴３５との対向位置に支持台３９を突出形成した例であり、前記ベルト１０が停止すると定盤３７は上昇し、支持台３９でシール台１６を支持するのである。この場合定盤３７と仮想枠４０の部分とを別構成すると共に、定盤３７を常時ベルト１０に接触させ、仮想枠４０の部分のみをベルト１０の移動に対応して上下動させるものを設計することもできる。
【００１４】
図１０はフレキシブル材により形成したシール台５０の両端局部をビス５４でもってベルト５５に固定する一方、前記シール台の両端局部下にそれぞれ橋脚５３を形成し、該両橋脚間においてシール台下側に退避間隙５２を形成した機構で、ベルト５５が停止するたびに支持台５７を前記ベルトの落し穴５６を通して押上げ、上からのシールバーの下降圧を支えるのであり、当該装置の場合、シール台５０がプーリの外をUターンするとき該シール台５０は前記退避間隙５７の厚み分だけベルト５５方向に沈み、場合のよっては落し穴５６及びプーリの落し輪溝にも沈むのである。
【００１５】
１１図はシール台１６に沿って断面三角形の可撓性支持台６０を設置(図２をも参照)する一方、ベルト１０に上下揺動可能に支持する一対の支持リンク６１の間に弾性棒６２を架設し、この弾性棒６２により包袋１７の開口部近傍を、前記可撓性支持台６０の押えて支持する構成であり、U形可曲可能なように前記弾性棒６２として長手方向に延伸可能なコイルスプリング、ゴム製棒を使用する。前記のシール台１６と可撓性支持台６０とは別個構成であるから、Uターン時シール台１６のみが落し穴３５に沈没する。ただしシール台１６と可撓性支持台６０とを一体形成し、これら両者を一体に落し穴３５及びプーリの落し輪溝３６に沈めることは可能である。
【図面の簡単な説明】
【図１】ベルト支持プーリ部分の側視断面図
【図２】前図の正面図
【図３】装置全体の平面図
【図４】前図の側面図
【図５】耐圧チャンバーの部分説明図
【図６】ベルトコンベヤの部分平面図
【図７】シール台の拡大断面図ただし次図のVII−VII断面
【図８】前図の正面図
【図９】シール台の拡大断面図
【図１０】シール台の正面図
【図１１】袋口押え棒の説明平面図
【図１２】従来技術の説明図
【符号の説明】
１０…ベルト
１１、１２…プーリ
１３…耐圧チャンバー
１６…シール台
１７…包袋
３５…落し穴
３６…落し輪溝
３７…定盤
３８…下駄歯
３９…支持台
５３…架橋
５２…退避間隙
６０…可撓性支持棒
６１…揺動リンク
６２…弾性棒[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a belt conveyor type sealing device for heat-welding the opening edge of a packaging bag.
[0002]
[Problems to be solved by the invention]
The stacked bags are mechanically taken out one by one and transported along an endless track, and the packages to be packed are sequentially put into the transported bags by an automatic checker. However, for example, pickled leaves and viscous boiled beans that are not suitable for volumetric measurements and are not suitable for automated bagging. Since the present situation is that the bag is packed by the hand of the worker and the weighing is performed, the seal of this type of bag is generally placed on a belt conveyor in parallel, A device that seals the belt conveyor while transferring in parallel is used.
[0003]
In the belt conveyor type sealing device, about 5 or 6 rod-shaped sealing stands installed on the endless belt are arranged in parallel with the roll supporting the belt, that is, the axis of the pulley, and the bag mouths are arranged on the sealing stand. It is common to transfer the wrapping bags all at once, and heat seal by pressing the seal bar placed in the upper region of the transfer track against each bag mouth on the seal stand. Since the packing bag of the object has a certain length, there is a problem that the pitch of each sealing stand on the belt becomes inevitably large when the sealing of the packing bag is performed by the above-mentioned apparatus. For the bag seal, a belt conveyor is used in which a seal base is fixed to the belt in a direction crossing the axis of the pulley (see Japanese Utility Model Publication No. 59-94004).
[0004]
In However conveyor belt to secure the seal base in a direction crossing the axis of the pulley, when bypass around the pulley 2 supporting it the belt 1 as shown in FIG. 12, the seal base 3 fixed to the belt, the belt 1 Since the upper surface is unilaterally stretched compared to the lower surface fixed to the material and material fatigue occurs, a fine division process 4 is required on the upper surface , and as a result, a uniform sealing pressure cannot be obtained at the bag mouth. There is. Moreover, the Teflon (registered trademark) tape for preventing the plastic melt film that melts from the sachet from adhering to the sealing table is covered. There is also the problem that the use of tape is not appropriate.
[0005]
As another example, the belt mouth of the bag that moves integrally with the belt 1 is not integrated with the belt 1 and the bag 1 that is moved together with the belt 1 is stranded on the stationary seal table 3, and then the seal bar descends from the top. Although a technique for heat-sealing the bag mouth is also disclosed, the positioning of the bag placed on the belt 1 is inevitably inaccurate, so the bag mouth edge of each bag to be carried in and the edge of the seal base 3 are As a result, there is a disadvantage that the seal marks between the respective sachets become irregular as a result.
[0006]
[Solution]
An object of the present invention is to solve each of the problems described above, and a bag mouth is formed on a seal base 16 in a direction crossing the axis of the pulley 11 on an endless belt 10 supported by a pair of pulleys 11 and 12. The bag 17 for carrying the bag is intermittently transferred integrally with the belt 10, and the bag opening of the bag 17 is clamped and melted by the seal bar descending toward the seal base 16 in the seal bar arrangement area. The mechanism is a mechanism in which both end portions of the sealing base 16 formed of a flexible material are fixed to the belt 10, and a hole dropped into the belt 10 along the sealing base 16 in an inner area of the both ends fixing portion of the sealing base 16. 35 is formed.
[0007]
In general, however, the belt 10 is formed of a flexible plate such as rubber, but a sealing base 16 that circulates around the pair of pulleys 11 and 12 together with the belt 10 is formed of a flexible material. Therefore, the seal base 16 is flexibly bent outside the pulley 11 and makes a U-turn. In this case, the seal base 16 is bent while sinking into the drop hole 35 of the belt 10. As already explained, in the prior art shown in FIG. 12, the inner surface of the sealing base 3 is fixed to the belt 1, and the outer surface is inevitably stretched. If the Teflon tape is temporarily attached, the Teflon tape is pulled. Although the seal table 16 was submerged in the drop hole 35 of the belt 10 to eliminate the stretching phenomenon of the outer surface of the seal table 16, it was not necessary to divide the seal table 16 every minute. It is possible to eliminate forced peeling.
[0008]
Depending on the thickness of the sealing base 16 in the height direction, the extension ratio of the outer surface with respect to the inner surface of the sealing base increases. In this case, the sealing base 16 is also submerged in the drop ring groove 36 formed on the pulley 11. The phenomenon of extending the outer surface of the sealing table 16 can be suppressed. As another example, as shown in FIG. 10, bridge piers 53 are respectively formed below both ends of the seal pedestal 50, and a clearance gap 52 is formed between the two piers 53 below the seal pedestal so that the pulley 55 is integrated with the belt 55. When making a U-turn outside, the seal base 50 can be sunk in the range of the retraction gap 52, and the stretching phenomenon of the outer surface of the seal base 50 can be suppressed.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The belt conveyor type sealing mechanism shown in FIG. 3 has an endless belt 10 stretched around a pair of round bar pulleys 11 and 12, while a box-shaped pressure-resistant chamber 13 is disposed above the belt 10. When the belt 10 is moved by the power of the motor 14 by a set amount toward the arrow 15, the seal base 16 fixed to the belt 10 in a direction intersecting the axis of the pulley 11 is connected to the pressure chamber 13. When the pressure-resistant chamber 13 descends and comes into close contact with the belt 10, the predetermined number of wrapping bags 17 with the bag mouths aligned with the sealing base 16 are in the airtight chamber surrounded by the belt 10 and the pressure-resistant chamber 13. The bag mouth is melt-sealed in a vacuum environment.
[0010]
FIG. 4 shows the side of the previous figure, and both ends of the pulleys 11 and 12 are fixed to the machine base 19 via bearings 18 respectively, while the rack teeth 20 are fixed to the symmetrical portion of the pressure-resistant chamber 13 and suspended. It is configured to engage with a pinion 22 supported by a bracket 21 erected on the machine base 19, and to operate the vertical movement of the pressure-resistant chamber 13 by the rotation of the pinion 22, and further protrudes from the front and rear surface center of the machine base 19. A pair of pins 23 are supported on a base 25 via bearings 24, and the machine base 19 and the base 25 are coupled via a connecting screw 26, and are installed by a cylinder 28 installed on the upper surface of the pressure-resistant chamber 13 shown in FIG. Then, the seal bar 29 is pushed down to the opening edge of the wrapping bag 17 on the seal base 16 and melt-sealed. If there is a high possibility that the object to be packaged contained in the bag 17 overflows from the bag mouth like a granular material or liquid, the machine screw 19 is attached to the machine base 19 by tightening the connecting screw 26 in FIG. It can be tilted in a direction that is difficult to spill out of the bag 17.
[0011]
As shown in FIG. 6, the belt 10 for fixing both ends of the flexible seal base 16 with screws 27 is formed by cutting out a drop hole 35 along the seal base 16 to sink the seal base, and as shown in FIG. The pulleys 11 and 12 form a drop groove 36 at a position along the drop hole 35. As a result, as shown in FIG. 1, when the seal base 16 makes a U-turn around the pulley 11, the inner surface of the seal base 16 is opened to the drop hole 35, and the inner surface can be easily contracted when bent. The outer surface of the sealing base does not extend unilaterally, and the sealing base sinks into the drop hole 35. Alternatively, depending on the thickness value in the height direction of the seal base 16, the outer surface of the drop ring groove 36 is also removed. It sinks.
[0012]
As shown in FIG. 5, in the lower region of the pressure-resistant chamber 13, a bridge-type surface plate 37 that supports the lower pressure-lowering of the pressure-resistant chamber may be necessary depending on the case. Since 16 is pushed down to the upper surface of the surface plate 37 through the drop hole 35 , a phenomenon of insufficient seal pressure with respect to the wrapping bag may occur. Therefore, in order to prevent such a phenomenon, in FIG. 7, a flexible clog tooth 38 having a height corresponding to the thickness of the belt 10, that is, the depth of the drop hole 35 is integrally formed on the lower surface of the seal base 16 (see also FIG. 8). ). As a result, the clog tooth 38 contacts the surface plate 37 and opposes the lower pressure drop of the seal bar.
[0013]
FIG. 9 is an example in which a support base 39 is formed to project at a position facing the drop hole 35 of the surface plate 37 that descends and retreats while the belt 10 and the seal base 16 move laterally integrally, and the belt 10 stops. Then, the surface plate 37 rises and supports the seal table 16 by the support table 39. In this case, the surface plate 37 and the virtual frame 40 are configured separately, and the surface plate 37 is always in contact with the belt 10 and only the portion of the virtual frame 40 is moved up and down corresponding to the movement of the belt 10. You can also
[0014]
FIG. 10 shows that both ends of a sealing base 50 formed of a flexible material are fixed to a belt 55 with screws 54, and a pier 53 is formed below both ends of the sealing base. With the mechanism in which the retraction gap 52 is formed, the support base 57 is pushed up through the belt drop hole 56 every time the belt 55 stops to support the lower pressure drop of the seal bar from above. When 50 makes a U-turn out of the pulley, the seal base 50 sinks in the direction of the belt 55 by the thickness of the retraction gap 57 and, depending on the case, sinks in the drop hole 56 and the drop ring groove of the pulley.
[0015]
11 shows that a flexible support base 60 having a triangular cross section is installed along the seal base 16 (see also FIG. 2), while an elastic bar is interposed between a pair of support links 61 that are supported on the belt 10 so as to be swingable up and down. 62 is constructed, and the elastic bar 62 supports the vicinity of the opening of the wrapping bag 17 by the flexible support base 60. The elastic bar 62 can be bent in the longitudinal direction so as to be U-shaped. Use a coil spring and rubber rod that can be stretched. Since the sealing table 16 and the flexible support table 60 are configured separately, only the sealing table 16 is dropped into the hole 35 during the U-turn. However, it is possible to integrally form the seal base 16 and the flexible support base 60 and drop them together into the hole 35 and the drop ring groove 36 of the pulley.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a belt support pulley portion. FIG. 2 is a front view of the previous view. FIG. 3 is a plan view of the entire apparatus. FIG. 4 is a side view of the previous view. [Fig. 6] Partial plan view of the belt conveyor [Fig. 7] Enlarged cross-sectional view of the seal pedestal, but the VII-VII cross section of the following figure [Fig. 8] Front view of the previous diagram [Fig. 9] Enlarged cross-sectional view of the seal pedestal [Fig. ] Front view of the seal stand [Fig. 11] Plan view of the bag mouth presser bar [Fig.
DESCRIPTION OF SYMBOLS 10 ... Belt 11, 12 ... Pulley 13 ... Pressure-resistant chamber 16 ... Seal stand 17 ... Bag 35 ... Drop hole 36 ... Drop ring groove 37 ... Surface plate 38 ... Clog tooth 39 ... Support stand 53 ... Bridge 52 ... Retraction gap 60 ... Possible Flexible support bar 61 ... Oscillating link 62 ... elastic bar

Claims

Of the endless belt on surface for supporting at both ends a pair of pulleys, the direction of the seal base intersecting the axis of the pulley, intermittently transfer the wrapper for placing a bag mouth on the belt integral with said at seal bar placement area A sealing mechanism that presses and melts the bag mouth of the wrapping bag by a sealing bar that descends toward the sealing table and the sealing table, and has both end portions of the sealing table formed of a flexible material on the belt On the other hand, a device in which a drop hole is formed in the belt along the seal table in the inner region of the both-end fixed part of the seal table.

Of the endless belt on surface supporting a pair of pulleys, a wrapper for placing a bag mouth in the direction seal stand intersecting the axis of the pulley, intermittently transferred to the belt integral with the seal at seal bar placement area A sealing mechanism that melts the bag mouth of the wrapping bag by a seal bar that descends toward the table and the seal table, and fixes both ends of the seal table formed of a flexible material to the belt, each end station subordinate sealing stage to form a pier were formed evacuation gap seal his honor side between the both piers device.

Consistent with passage region pitfalls, according to claim 1 or 2 to form a ring groove dropped a pair of pulleys.

The apparatus of Claim 1 or 2 which presses the bag mouth on the flexible support stand arrange | positioned along a seal stand to the said support stand by the elastic bar which exists along the said support stand.

2. A seal bar that descends toward the seal base is mounted in a pressure-resistant chamber that descends toward the belt and forms an airtight space for forming a vacuum environment therein, and seals the bag mouth in the airtight space. Or the apparatus of 2.