JP5913992B2 - Bag mouth opening method and opening device - Google Patents

Bag mouth opening method and opening device Download PDF

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JP5913992B2
JP5913992B2 JP2012004350A JP2012004350A JP5913992B2 JP 5913992 B2 JP5913992 B2 JP 5913992B2 JP 2012004350 A JP2012004350 A JP 2012004350A JP 2012004350 A JP2012004350 A JP 2012004350A JP 5913992 B2 JP5913992 B2 JP 5913992B2
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bag mouth
pair
mouth
opening device
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暁夫 山根
暁夫 山根
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東洋自動機株式会社
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B43/00—Forming, feeding, opening or setting-up containers or receptacles in association with packaging
    • B65B43/26—Opening or distending bags; Opening, erecting, or setting-up boxes, cartons, or carton blanks
    • B65B43/34—Opening or distending bags; Opening, erecting, or setting-up boxes, cartons, or carton blanks by internal pressure
    • B65B43/36—Opening or distending bags; Opening, erecting, or setting-up boxes, cartons, or carton blanks by internal pressure applied pneumatically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B43/00—Forming, feeding, opening or setting-up containers or receptacles in association with packaging
    • B65B43/26—Opening or distending bags; Opening, erecting, or setting-up boxes, cartons, or carton blanks
    • B65B43/30—Opening or distending bags; Opening, erecting, or setting-up boxes, cartons, or carton blanks by grippers engaging opposed walls, e.g. suction-operated

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Supplying Of Containers To The Packaging Station (AREA)

Description

本願発明は、袋の袋口を開口する開口方法及び開口装置に関する。より具体的には、互いに接離自在な左右一対のグリッパーで袋の両側縁部を把持し、当該袋を水平面内における所定の移動軌跡に沿って移送しながら、袋口の開口、被包装物の充填、袋口のシール等所定の包装処理を順次行う袋詰め包装における袋口の開口方法及び開口装置に関する。   The present invention relates to an opening method and an opening device for opening a bag mouth of a bag. More specifically, gripping both side edges of the bag with a pair of left and right grippers that can be moved toward and away from each other, and transferring the bag along a predetermined movement locus in a horizontal plane, In particular, the present invention relates to a bag mouth opening method and an opening device in bag stuffing and packaging in which predetermined packaging processing such as filling of a bag and sealing of a bag mouth are sequentially performed.

上記の袋詰め包装における袋口を開口する装置としては、特許第２５８７９４６号公報に開示されるような、一対の吸盤を袋の両側面に吸着させ、この吸盤を互いに離反させて袋口を開口し、その際に空気を袋口に向けて噴射して開口を助長する技術が知られている。   As an apparatus for opening the bag mouth in the above-mentioned bagging and packaging, as disclosed in Japanese Patent No. 2587946, a pair of suction cups are adsorbed on both sides of the bag, and the suction mouths are separated from each other to open the bag mouth. In this case, a technique is known in which air is sprayed toward the bag mouth to promote the opening.

ところが、袋の材質、或いは静電気等の要因により、袋を構成する表裏のフィルム同士が強固に密着して、その密着力が吸盤の吸着力より大きい場合には、上記の公知技術では確実且つ安定的に袋口の開口が行えないといった問題があった。   However, when the front and back films constituting the bag are firmly adhered to each other due to factors such as the material of the bag or static electricity, and the adhesion force is greater than the suction force of the suction cup, the above-mentioned known technology is reliable and stable. In particular, there was a problem that the opening of the bag mouth could not be performed.

そのような問題を解決すべく特開平８−３０１２２６号には、開口装置による開口動作に先立ち、上下に振動して容器（袋）の上辺部を打振する打振部を備えた打振装置、或いは回転しながら袋の上辺部に接触しながら移動する摩擦ローラを用いる摩擦装置を備えた開口装置により袋口上辺部を分離させる技術が開示されている。   In order to solve such a problem, Japanese Patent Laid-Open No. 8-301226 discloses a vibration striking device including a vibration striking unit that vibrates up and down and vibrates the upper side of a container (bag) prior to opening operation by the opening device. Alternatively, a technique for separating the upper side portion of the bag mouth by an opening device provided with a friction device using a friction roller that moves while contacting the upper side portion of the bag while rotating is disclosed.

しかしながらこの装置では、打振装置の打振部或いは摩擦装置の摩擦ローラが直接袋口の縁部に接触して当該袋口の密着を解す構成になっているため、袋口を傷つける、あるいは打振部、摩擦ローラに付着した異物が袋内に混入する、さらには打振部、摩擦ローラが磨耗し、その磨耗粉が袋内に混入するといった問題の発生が避けられない。   However, in this device, since the vibration unit of the vibration device or the friction roller of the friction device is in direct contact with the edge of the bag mouth to release the bag mouth, the bag mouth is damaged or hammered. It is inevitable that the foreign matter adhering to the vibration part and the friction roller is mixed in the bag, and the vibration part and the friction roller are worn and the wear powder is mixed in the bag.

また、特開２００４−８３１０２号公報には、予備開口工程に先立ち、袋の片側のシートにエア噴射口を形成し、予備開口工程でそのエア噴射口にノズルを差し込み、エアを吹き込んで袋口を予備開口し、その後の工程で袋口を拡開する構成が示されている。   Further, in Japanese Patent Application Laid-Open No. 2004-83102, prior to the preliminary opening process, an air injection port is formed on one sheet of the bag, a nozzle is inserted into the air injection port in the preliminary opening process, and air is blown to A configuration is shown in which a bag opening is opened in a subsequent process.

しかしながらこの装置では、噴射口を形成したり、或いは袋口をシールした後に噴射口が形成された開口部の上側部分を切断したりすることから、工程数の増加が避けられず、装置が大型化し、複雑化し、コストアップが避けられない。また、予備開口工程でエア噴射ノズルを噴射口に押し当てるため、特開８−３０１２２６号公報記載の装置同様に袋口を傷つけ、或いはエア噴射ノズルに付着した異物が袋内に混入する、さらにはエアー噴射ノズルが磨耗し、その摩耗粉が袋内に混入するといった問題の発生が避けられない。   However, in this apparatus, since the injection port is formed, or the upper part of the opening part where the injection port is formed is cut after the bag port is sealed, an increase in the number of processes is inevitable, and the apparatus is large. , Complexity, and cost increase is inevitable. Further, since the air injection nozzle is pressed against the injection opening in the preliminary opening step, the bag opening is damaged like the apparatus described in JP-A-8-301226, or foreign matter adhering to the air injection nozzle is mixed in the bag. However, the problem is that the air injection nozzle is worn and the wear powder is mixed into the bag.

特許第２５８７９４６号公報Japanese Patent No. 2587946 特開平８−３０１２２６号JP-A-8-301226 特開２００４−８３１０２号公報JP 2004-83102 A

本願発明は上記従来技術の問題点に鑑みなされたものであり、簡単な構成で、確実、且つ安定した袋口の開口が行えると共に、袋口を傷つけたり、袋内に異物が混入することのない袋口の開口方法及び開口装置を提供することをその課題とする。 The present invention has been made in view of the above-mentioned problems of the prior art. With a simple configuration, the bag mouth can be opened reliably and stably, and the bag mouth can be damaged or foreign matter can be mixed into the bag. It is an object of the present invention to provide an opening method and an opening device for a bag opening that does not exist.

上記課題を解決するために本願発明は、左右一対のグリッパーで袋の両側縁部を把持し、水平面内の所定の移動軌道に沿って該袋を移送しながら被包装物の袋詰めを行う袋詰め包装における袋の袋口開口方法において、以下の工程を含む袋口開口方法を提供する。
袋口が閉じた状態で両側縁部を前記一対のグリッパーにより把持された袋に対して、一対の板状の袋口倒れ防止部材を、前記袋の袋口を間に挟んでそれぞれ前記袋から所定の僅かな隙間をあけて互いに対向して位置する作用位置に配置し、前記袋の長さ方向において前記袋口の縁部に対して対向配置されたガス噴射ノズルから前記閉じた状態の袋口に向けてガスを噴射する予備開口工程：
一対の吸着部材を前記袋の袋口の両面に吸着させ、前記予備開口工程で前記ガス噴射ノズルからガスの噴射を開始した後に、前記一対の吸着ノズルを前記袋に吸着させたまま互いに離反させと共に、前記一対のグリッパーを互いに接近させる開口工程：
上記方法において、前記袋は円弧軌道に沿って間欠的に移送されるものとすることができる。
上記方法において、前記袋口倒れ防止部材は、前記作用位置と、前記作用位置から退避した退避位置との間で移動自在に構成され、前記予備開口工程において前記作用位置に位置するようにすることができる。
また上記課題を解決するために本願発明は、左右一対のグリッパーで袋の両側縁部を把持し、水平面内の所定の移動軌道に沿って該袋を移送しながら被包装物の袋詰めを行う袋詰め包装機における袋の袋口開口装置において、以下の構成を含む袋口開口装置を提供する。
前記グリッパーに把持された袋の袋口を間に挟み、互いに対向して位置する一対の板状の袋口倒れ防止部材：
前記一対の袋口倒れ防止部材に挟まれた袋の袋口の縁部に対して前記袋の長さ方向において対向して位置するガス噴射ノズル：
前記袋の袋口に両面から吸着する吸着位置と前記袋口の両面から離れた退避位置との間で移動可能な一対の吸着部材：
そしてその袋口開口装置は、
前記一対の袋口倒れ防止部材は、袋口が閉じた状態で両側縁部を前記一対のグリッパーにより把持された袋に対して、前記袋の袋口を間に挟んでそれぞれ前記袋から所定の僅かな隙間をあけて互いに対向して位置する作用位置に配置され、
前記ガス噴射ノズルは、前記閉じた状態にある袋口に向かってガス噴射を開始し、
前記ガス噴射ノズルが前記閉じた状態にある袋口に向かってガス噴射を開始した後に、前記吸着部材が前記吸着位置から前記退避位置へ向かって移動し、前記グリッパーが互いに接近する
ように構成されている。
上記装置において、前記袋は円弧軌道に沿って間欠的に移送されることとすることができる。
上記装置において、前記一対の袋口倒れ防止部材は、前記作用位置と、該作用位置から退避した退避位置との間で移動自在とすることができる。
上記装置において、前記一対の袋口倒れ防止部材はそれぞれ前記一対の吸着部材に連結され、前記一対の吸着部材と一体的に移動するように構成することができる。
上記装置において、前記袋口倒れ防止部材と前記ガス噴射ノズルは、前記袋の移動軌跡に沿って前記一対の吸着部材より上流側に配置するようにできる。
上記装置において、前記袋口倒れ防止部材は、前記袋の長さ方向において、その一端側は前記袋に対して袋口の縁部より袋底側に位置し、他端側は前記袋口の縁部を超えて延びるように構成しても良い。
上記装置において、前記一対の袋口倒れ防止部材は、前記一端側の端縁部から所定の範囲で前記袋の幅方向及び長さ方向で互いに平行に延びる平行平面部と、前記平行平面部に繋がって延び、前記他端側の端縁部に向かうにつれて次第に遠ざかるように逆「ハ」の字型に形成された傾斜面部とを備え、前記袋口の縁部は前記平行平面部の間に位置するようにすることができる。

In order to solve the above-mentioned problem, the present invention is a bag that holds both side edges of a bag with a pair of left and right grippers and packs an object to be packaged while transferring the bag along a predetermined movement track in a horizontal plane. In the bag mouth opening method in stuffing and packaging, a bag mouth opening method including the following steps is provided.
With the bag mouth closed, a pair of plate-shaped bag mouth fall-preventing members are respectively sandwiched between the bag mouths of the bag, with the edges gripped by the pair of grippers. The bag in the closed state is disposed from a gas injection nozzle disposed at a working position that is opposed to each other with a predetermined slight gap, and is opposed to the edge of the bag mouth in the length direction of the bag. Pre-opening process for injecting gas towards the mouth :
A pair of adsorption members are adsorbed on both sides of the bag mouth of the bag , and after injecting gas from the gas injection nozzle in the preliminary opening step, the pair of adsorption nozzles are separated from each other while being adsorbed on the bag. And an opening step of bringing the pair of grippers close to each other:
In the above method, the bag may be intermittently transferred along an arcuate track.
In the above method, the bag mouth falling prevention member, said operating position, said movably configured between a retracted position retracted from the action position, to ensure that at the operating position in the preliminary opening step Can do.
In order to solve the above problems, the present invention grips both side edges of a bag with a pair of left and right grippers, and packs a packaged item while transferring the bag along a predetermined movement trajectory in a horizontal plane. In a bag opening device for a bag in a bag filling and packaging machine, a bag opening device including the following configuration is provided.
A pair of plate-shaped bag mouth fall prevention members sandwiched between the bag mouths held by the grippers and positioned opposite to each other :
A gas injection nozzle located opposite to the edge of the bag mouth of the bag sandwiched between the pair of bag mouth fall prevention members in the length direction of the bag:
A pair of adsorbing members movable between an adsorbing position adsorbing from both sides to the bag mouth of the bag and a retreating position away from both sides of the bag mouth:
And the bag mouth opening device is
The pair of bag mouth fall-preventing members are provided in a state in which the bag mouth is closed with respect to a bag gripped by the pair of grippers on both side edges from the bag. It is arranged at the working position that is located opposite to each other with a slight gap,
The gas injection nozzle starts gas injection toward the bag mouth in the closed state,
After the gas injection nozzle starts gas injection toward the closed bag mouth, the adsorption member moves from the adsorption position toward the retracted position, and the grippers approach each other.
It is configured as follows.
In the above apparatus, the bag may be intermittently transferred along an arcuate track.
In the above apparatus, the pair of bag mouth fall-preventing members can be freely moved between the operating position and a retracted position retracted from the operating position .
In the above apparatus, the pair of bag mouth fall-preventing members may be connected to the pair of suction members, respectively, and may move integrally with the pair of suction members.
In the above apparatus, the bag mouth fall prevention member and the gas injection nozzle may be arranged upstream of the pair of adsorption members along the movement trajectory of the bag.
In the above device, the bag mouth fall-preventing member has one end side positioned on the bag bottom side from the edge of the bag mouth with respect to the bag, and the other end side of the bag mouth in the length direction of the bag. You may comprise so that it may extend beyond an edge.
In the above-described apparatus, the pair of bag mouth fall prevention members include a parallel plane portion extending in parallel with each other in a width direction and a length direction of the bag within a predetermined range from an edge portion on the one end side, and the parallel plane portion. And an inclined surface portion formed in an inverted “C” shape so as to gradually move away toward the end edge on the other end side, and the edge of the bag mouth is between the parallel plane portions Can be positioned.

上記のとおり、本願発明によれば、一対の吸着部材による袋口の開口を行うに先立ち、袋口にガスを吹付けてその力により袋口の密着状態を解すが、その際に一対の袋口倒れ防止部材を備えているので、ガスの力で袋口がばたついたり、折れ曲がって倒れてしまうことが防止されるので、ガスが確実に袋口に吹付けられ、その解し効果が確実に得られる。また、袋の長さ方向において、一対の袋口倒れ防止部材の一端側が袋に対して袋口の縁部より袋底側に位置する一方、他端側が袋口の縁部を越えて延びるようにすることにより、さらにはその他端側において逆「ハ」の字形に形成した場合には、ノズルから噴射されるガスを袋口へ集中して吹き付ける効果を有し、袋口を解す効果をさらに高めることができる。さらに、ノズルによってガスを吹き付けるだけであるので、従来技術に関連して説明した問題点、すなわち袋口を傷つけたり、袋内に異物が混入することなどもない。 As described above, according to the present invention, prior to opening the bag mouth by the pair of adsorbing members, gas is blown to the bag mouth to release the close contact state of the bag mouth. Since it is equipped with a mouth-fall prevention member, it prevents the bag mouth from flapping by the force of gas or bending and falling down, so that the gas is surely sprayed on the bag mouth, and its unwinding effect It is definitely obtained. Further, in the length direction of the bag, one end side of the pair of bag mouth fall prevention members is positioned on the bag bottom side with respect to the bag from the edge of the bag mouth, and the other end side extends beyond the edge of the bag mouth. In addition, when formed in a reverse “C” shape on the other end side, it has the effect of concentrating and blowing the gas injected from the nozzle to the bag mouth, and further the effect of unraveling the bag mouth Can be increased. Furthermore, since the gas is merely blown by the nozzle, there is no problem described in connection with the prior art, that is, the bag mouth is not damaged, or foreign matter is not mixed into the bag.

本願の第１の実施の形態に係る袋口開口装置を使用した間欠回転式ロータリ型袋詰め包装機の全体構成を示す模式的斜視図である。It is a typical perspective view which shows the whole structure of the intermittent rotation type rotary type bagging and packaging machine using the bag opening apparatus which concerns on 1st Embodiment of this application. 第１の実施形態に係る予備開口工程と開口工程の動作説明図である。It is operation | movement explanatory drawing of the preliminary | backup opening process and opening process which concern on 1st Embodiment. 本願の第２の実施の形態に係る袋口開口装置を使用した間欠回転式ロータリ型袋詰め包装機の全体構成を示す模式的斜視図である。It is a typical perspective view which shows the whole structure of the intermittent rotation type rotary type bag filling packaging machine using the bag mouth opening device which concerns on 2nd Embodiment of this application. 第２の実施の形態に係る予備開口工程の動作説明図である。It is operation | movement explanatory drawing of the preliminary | backup opening process which concerns on 2nd Embodiment.

以下図面を参照して本願発明の実施の形態に係る袋口開口方法及び装置について説明する。 A bag mouth opening method and apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

図1は本願発明の第１の実施の形態に係る袋口開口装置６を使用した間欠回転式ロータリー型袋詰め包装機（以下、単に「包装機」という。）１の全体構成を示す模式的斜視図である。なお、以下においては間欠回転式ロータリー型袋詰め包装機を例として説明するが、本願発明が適用されるのはそれに限定されない。すなわち、グリッパーに把持される袋の姿勢は垂直姿勢、或いは水平姿勢のいずれでも良い。また、袋の移送は間欠移送に限定されず、連続的移送でも良い。また、袋の移送軌道は円弧状、直線状或いはレーストラック状などいずれでも良い。 FIG. 1 is a schematic diagram showing an overall configuration of an intermittent rotary type bag filling and packaging machine (hereinafter simply referred to as “packaging machine”) 1 using a bag mouth opening device 6 according to a first embodiment of the present invention. It is a perspective view. In the following, an intermittent rotation type rotary bag filling and packaging machine will be described as an example, but the present invention is not limited thereto. That is, the posture of the bag held by the gripper may be either a vertical posture or a horizontal posture. Further, the bag transfer is not limited to intermittent transfer, and may be continuous transfer. Further, the bag transfer trajectory may be any of an arc shape, a straight line shape, a race track shape, and the like.

図において二点鎖線で示され符号２を付された部材は図中の矢印方向に回転する回転テーブルであり、図示しないインデックスユニット及びモータに連結され、モータの回転角に応じて移動と停止を間欠的に繰返す。回転テーブル２には円周方向所定の間隔で、包装袋（以下「袋」という。）Ｂの上部両側縁部を把持する把持装置すなわち左右一対のグリッパー３、３が複数組取付けられている。回転テーブル２の周囲に沿って付されたアラビア数字は回転テーブル２の周囲に沿って設定された各種包装処理を行うためのステーションを示し、ステーションIではマガジン４から袋Ｂが一枚ずつ取り出されて順次グリッパー３、３に供給され、グリッパー３、３によって上部両側縁部を把持され、垂直状態に保持される。ステーションIIでは印字器５により袋Ｂに製造日等が印刷される。ステーションIIIには袋Ｂの袋口を開口する開口装置６が配置されている。これについては後述する。ステーションＩＶには昇降ホッパ７が配置され、被包装物の袋Ｂへの充填が行われ、ステーションＶには脱気ノズル８が配置され、袋Ｂ内の脱気が行われる。ステーションＶＩ，ＶＩＩにはそれぞれ一対の第１及び第２の熱板９，９，１０，１０が配置され、袋Ｂの袋口の第１シール処理、第２シール処理を行い、ステーションＶＩＩＩには一対の冷却板１１、１１が配置され、これにより袋口を冷却し、その後にグリッパー３、３を開いて製品としての袋Ｂを製品放出シュート１２へ放出する。 In the figure, a member indicated by a two-dot chain line and denoted by reference numeral 2 is a rotary table that rotates in the direction of the arrow in the figure. Repeat intermittently. A plurality of sets of gripping devices, that is, a pair of left and right grippers 3, 3 are attached to the turntable 2 at predetermined intervals in the circumferential direction to grip upper side edges of a packaging bag (hereinafter referred to as “bag”) B. The Arabic numerals attached along the periphery of the turntable 2 indicate stations for performing various packaging processes set along the periphery of the turntable 2. In the station I, the bags B are taken out from the magazine 4 one by one. Are sequentially supplied to the grippers 3 and 3, the upper side edges are gripped by the grippers 3 and 3, and are held in a vertical state. In the station II, the date of manufacture is printed on the bag B by the printer 5. In the station III, an opening device 6 for opening the bag mouth of the bag B is arranged. This will be described later. In the station IV, the lifting hopper 7 is disposed, and the bag B is filled with the article to be packaged. In the station V, the deaeration nozzle 8 is disposed, and the bag B is deaerated. A pair of first and second hot plates 9, 9, 10, and 10 are arranged in the stations VI and VII, respectively, and the first sealing process and the second sealing process of the bag mouth of the bag B are performed. In the station VIII, A pair of cooling plates 11, 11 are arranged, thereby cooling the bag mouth, and then opening the grippers 3, 3 to discharge the bag B as a product to the product discharge chute 12.

次に図２を参照して袋口開口装置（以下「開口装置」という。）６について詳述する。図２は前述のとおり開口装置６による予備開口工程とそれに続く開口工程の動作説明図であり、（Ａ）は袋ＢがステーションＩＩＩに移送されてきた直後の状態を示し、（Ｂ）は後述する予備開口を行っている状態を示し、（Ｃ）は開口工程の終期の状態を示す図である。以下、順に説明する。   Next, the bag opening device (hereinafter referred to as “opening device”) 6 will be described in detail with reference to FIG. FIG. 2 is an operation explanatory view of the preliminary opening process by the opening device 6 and the subsequent opening process as described above. FIG. 2A shows a state immediately after the bag B is transferred to the station III, and FIG. The state which performs the preliminary opening to perform is shown, (C) is a figure which shows the state of the last stage of an opening process. Hereinafter, it demonstrates in order.

先ず図２（Ａ）を参照して開口装置６の構成を説明する。開口装置６は、予備開口工程を実施するための一対の袋口倒れ防止部材２１、２１、エアーすなわち空気を噴出するノズル２７と、開口工程を実施するための一対の吸盤３１，３１を供えている。本実施の形態ではノズル２７からはエアーすなわち空気が噴出されるとして説明するが、それに限定されず例えば窒素などでもよく、害のない気体すなわちガスであればよい。また、必要に応じてそのガスは加圧された状態で噴射されるようにしてもよい。   First, the configuration of the opening device 6 will be described with reference to FIG. The opening device 6 includes a pair of bag mouth fall prevention members 21 and 21 for performing the preliminary opening process, a nozzle 27 for ejecting air, that is, air, and a pair of suction cups 31 and 31 for performing the opening process. Yes. In the present embodiment, description will be made on the assumption that air, that is, air is ejected from the nozzle 27, but the present invention is not limited to this. Moreover, you may make it inject the gas in the pressurized state as needed.

一対の袋口倒れ防止部材（以下「倒れ防止部材」という。）２１，２１は板状の部材であり、二つの部材は同じ形状をしていて、後述するようにステーションＩＩＩに移送されてくる袋Ｂの上部の袋口側を間に挟んで互いに対向するように配置されている。倒れ防止部材２１，２１の幅は特に限定されないが、袋Ｂの幅と同等、或いはそれより長く形成するのが望ましい。倒れ防止部材２１，２１は、袋Ｂの袋口の部分を挟んで互いに平行に、袋Ｂの幅方向に延びる平行平面部２２，２２と、平行平面部２２，２２の上端から上に伸びるにつれて互いに遠ざかる、すなわち逆「ハ」の字形になる傾斜面部２３，２３とを備えている。そして、平行平面部２２，２２の幅方向略中央においてその下縁側に略方形の切欠２４が形成されている。倒れ防止部材２１，２１の上方には、図示しないエアー源に繋がるノズル２７が配置されている。ノズル２７の位置は二つの倒れ防止部材２１，２１の幅方向及び離間距離の中央部、すなわちステーションＩＩＩに移送されてくる袋Ｂの幅方向中央で袋Ｂの真上に位置し、その噴射口が袋口に向かう姿勢で配置されている。換言すれば、ノズル２７は、袋Ｂの長さ方向（袋口縁部に略直交し、袋口縁部から袋底へ延びる線の方向）において袋口の縁部に対して対向するように配置されている。なお、倒れ防止部材２１，２１の高さ方向の位置は、グリッパー３に把持された袋Ｂの袋口縁部が平行平面部２２，２２の高さ方向略中央に位置する高さとなっている。   A pair of bag mouth fall-preventing members (hereinafter referred to as “fall-prevention members”) 21 and 21 are plate-like members, and the two members have the same shape and are transferred to station III as will be described later. It arrange | positions so that it may mutually oppose on both sides of the bag mouth side of the upper part of the bag B. The width of the fall-preventing members 21 and 21 is not particularly limited, but it is desirable to form the same as or longer than the width of the bag B. The fall prevention members 21, 21 are parallel to each other across the bag mouth portion of the bag B, and extend upward from the parallel flat portions 22, 22 extending in the width direction of the bag B and the upper ends of the parallel flat portions 22, 22. Inclined surface portions 23, 23 that are separated from each other, that is, have an inverted “C” shape. A substantially rectangular notch 24 is formed on the lower edge side of the parallel plane portions 22 and 22 at the substantially center in the width direction. Above the fall prevention members 21 and 21, a nozzle 27 connected to an air source (not shown) is arranged. The nozzle 27 is positioned directly above the bag B at the center of the width direction of the two fall prevention members 21 and 21, and the center of the separation distance, that is, the center of the width of the bag B transferred to the station III. Is arranged in a posture toward the bag mouth. In other words, the nozzle 27 faces the edge of the bag mouth in the length direction of the bag B (the direction of the line that is substantially orthogonal to the bag mouth edge and extends from the bag mouth edge to the bag bottom). Has been placed. The position in the height direction of the fall prevention members 21 and 21 is a height at which the bag mouth edge of the bag B gripped by the gripper 3 is positioned approximately at the center in the height direction of the parallel flat portions 22 and 22. .

一対の吸盤３１，３１は従来の袋口開口装置に使用されていた吸盤と同様のものでよく、それぞれアーム３２，３２に取付けられ、互いに接離可能な構成になっている。この吸盤を互いに接離させる構成は公知であるのでその説明は省略する。前述の倒れ防止部材２１，２１はそれぞれ取付け板３３，３３によってアーム３２，３２に取付けられ、吸盤３１，３１と一体的に、後述する待機位置と作用位置との間で移動するようになっている。 The pair of suction cups 31 and 31 may be the same as the suction cups used in the conventional bag mouth opening device, and are attached to the arms 32 and 32, respectively, so that they can be brought into contact with and separated from each other. Since the structure for bringing the suction cups into and out of contact with each other is well known, a description thereof will be omitted. The above-described collapse prevention members 21 and 21 are attached to the arms 32 and 32 by attachment plates 33 and 33, respectively, and move integrally between the suction cups 31 and 31 between a standby position and an action position described later. Yes.

次に予備開口工程及び開口工程での動作について順に説明する。図２（Ａ）においてグリッパー３，３，に把持されて袋ＢがステーションＩＩＩに移送されて停止する。この時倒れ防止部材２１，２１は互いに所定の間隔だけ離れた退避位置におり、袋Ｂの移動の妨げにはならず、袋Ｂはその二つの倒れ防止部材２１，２１の間に進入する。吸盤３１，３１の先端はそれぞれの倒れ防止部材２１，２１の対面する内側の面より若干突出しているが、これも袋Ｂの移動の妨げはしない。ノズル２７からのエアーの噴出は未だ始まっていない。   Next, operations in the preliminary opening process and the opening process will be described in order. In FIG. 2A, the bag B is held by the grippers 3 and 3 and transferred to the station III to stop. At this time, the fall prevention members 21 and 21 are at a retracted position separated from each other by a predetermined distance, and do not hinder the movement of the bag B, but the bag B enters between the two fall prevention members 21 and 21. The tips of the suction cups 31 and 31 slightly protrude from the inner surfaces of the respective fall prevention members 21 and 21 that face each other, but this also does not hinder the movement of the bag B. The ejection of air from the nozzle 27 has not yet started.

袋ＢがステーションＩＩＩに到達して停止すると、或いは袋Ｂの移動の妨げにならない限りにおいてその到達前のある時点において、一対の吸盤３１，３１と一対の倒れ防止部材２１，２１とはそれぞれ互いに接近動作を開始する。そして倒れ防止部材２１，２１が袋Ｂの両側でそれぞれ作用位置に到達すると停止する（図２（Ｂ））。この作用位置において、倒れ防止部材２１，２１の平行平面部２２，２２は袋Ｂとの間に僅かな隙間を残して、すなわち後述するように袋口に向けてエアーが吹き付けられても袋口が倒れるのを防止できる間隔で位置している。この時、吸盤３１、３１も作用位置に位置して袋Ｂの両面に当接している。また、倒れ防止部材２１，２１及び吸盤３１，３１がそれぞれ作用位置に到達する前或いは到達後の所定のタイミングでノズル２７からエアーの噴出が開始され、袋口へエアーを吹きつける。これにより密着した袋口が解される。以上が予備開口工程である。 When the bag B reaches the station III and stops, or at a certain point before the bag B moves, the pair of suction cups 31 and 31 and the pair of fall prevention members 21 and 21 are mutually connected. Start approaching. Then, when the fall prevention members 21 and 21 reach the operating positions on both sides of the bag B, they stop (FIG. 2B). At this working position, the parallel flat portions 22 and 22 of the fall prevention members 21 and 21 leave a slight gap between the bag B, that is, even if air is blown toward the bag mouth as will be described later. It is located at an interval that can prevent falling. At this time, the suction cups 31, 31 are also in the working position and are in contact with both surfaces of the bag B. In addition, before the falling prevention members 21 and 21 and the suction cups 31 and 31 reach the operating positions, or at a predetermined timing after reaching, the nozzle 27 starts to blow air and blows air to the bag mouth. Thereby, the tightly closed bag mouth is unraveled. The above is the preliminary opening process.

吸盤３１，３１にはそれらが作用位置に到達する直前から真空が作用し、作用位置に到達した吸盤３１，３１は袋Ｂの両側に吸着する。次いで、それぞれ一対の倒れ防止部材２１，２１と吸盤３１，３１が同時にそれぞれ互いに遠ざかる離反動作を開始し、それと共にグリッパー３，３が互いに接近し始める。これにより袋口が開き始める。なお、袋口が開き始めるとノズル２７から噴射されるエアーが袋Ｂの中へ吹き込まれ、袋口の開口が促進される。吸盤３１，３１が退避位置に向かって移動する途中で袋口が十分に開口され（図２（Ｃ））、その時点においてグリッパー３，３は停止され、ノズル２７からのエアーの噴射も停止され、また吸盤３１，３１への真空の作用も停止されて吸盤３１，３１は袋Ｂから離れる。倒れ防止部材２１，２１と吸盤３１，３１はさらに移動を続け、退避位置に到達すると停止する。以上が開口工程である。そして倒れ防止部材２１，２１及び吸盤３１，３１の停止と前後して、袋口が開口した状態で袋Ｂは次のステーションＩＶに移送される。 A vacuum acts on the suction cups 31 and 31 immediately before they reach the operating position, and the suction cups 31 and 31 that have reached the operating position are adsorbed on both sides of the bag B. Next, the pair of falling prevention members 21 and 21 and the suction cups 31 and 31 start to move away from each other at the same time, and the grippers 3 and 3 start to approach each other at the same time. As a result, the bag mouth begins to open. When the bag mouth starts to open, air blown from the nozzle 27 is blown into the bag B, and the opening of the bag mouth is promoted. While the suction cups 31 and 31 are moving toward the retracted position, the bag mouth is sufficiently opened (FIG. 2C). At that time, the grippers 3 and 3 are stopped, and the injection of air from the nozzle 27 is also stopped. Also, the vacuum action on the suction cups 31 and 31 is stopped and the suction cups 31 and 31 are separated from the bag B. The fall prevention members 21 and 21 and the suction cups 31 and 31 continue to move and stop when they reach the retracted position. The above is the opening process. Then, the bag B is transferred to the next station IV with the bag mouth opened before and after the fall prevention members 21 and 21 and the suction cups 31 and 31 are stopped.

上述のとおり、予備開口工程において、倒れ防止部材によって袋口がばたついたり、倒れるのを防止しながら、（必要あれば加圧した）ガスを袋口に向けて吹き付けるので、袋口において袋の両側シートが密着していても、その密着状態が十分に解され、次に行う吸盤を用いての開口を確実且つ安定的に行うことができる。なお、袋口倒れ防止部材の上側の部分は上記のとおり袋口の縁部を越えて延びており、さらには逆「ハ」の字形になっているので、ノズルから噴射されるエアーを袋口縁部に集中して作用させることができ、解しの効果はさらに高まる。 As described above, in the preliminary opening step, the bag opening is blown toward the bag opening (pressurized if necessary) while preventing the bag opening from flapping or falling down by the falling prevention member. Even if the both side sheets are in close contact with each other, the contact state is sufficiently solved, and the next opening using the suction cup can be performed reliably and stably. Note that the upper part of the bag mouth fall prevention member extends beyond the edge of the bag mouth as described above, and has a reverse “C” shape. The action can be concentrated on the edge, and the effect of unraveling is further enhanced.

次に図３、４を参照して第２の実施の形態について説明する。図３は第１の実施の形態の図１に対応する図であり、第２の実施の形態に係る開口装置４０を使用した間欠回転式ロータリー型袋詰め包装機５１を示している。その構成は大半において図１に示された包装機１の構成と同じであるので、同じ部材或いは装置については同じ番号を付し、その説明は省略する。以下、図１と異なる構成についてのみ説明する。 Next, a second embodiment will be described with reference to FIGS. FIG. 3 is a view corresponding to FIG. 1 of the first embodiment, and shows an intermittent rotary type rotary bag filling and packaging machine 51 using the opening device 40 according to the second embodiment. Since the configuration is almost the same as the configuration of the packaging machine 1 shown in FIG. 1, the same members or apparatuses are denoted by the same reference numerals, and the description thereof is omitted. Only the configuration different from FIG. 1 will be described below.

すなわちこの実施の形態では、開口装置４０のうち、予備開口工程を実施する一対の倒れ防止部材４１，４１とエアーを噴射するノズル（第１ノズル）２７は印字工程が実行されるステーションＩＩに配置されている。そして開口工程を実施する一対の吸盤３１，３１は追加のノズル（第２ノズル）４４とともにステーションＩＩＩに配置されている。一対の倒れ防止部材４１，４１と一対の吸盤３１，３１とは図２のアーム３２，３２と同様のアーム（図示せず）にそれぞれ取付けられて、それぞれの退避位置と作用位置との間で移動するようになっている。なお、倒れ防止部材４１，４１の構成は第１の実施の形態での倒れ防止部材２１，２１と同様に平行平面部４２，４２と傾斜部４３，４３を備えているが、方形の切欠２４，２４に相当するものは設けられていない。   That is, in this embodiment, in the opening device 40, the pair of fall prevention members 41 and 41 for performing the preliminary opening process and the nozzle (first nozzle) 27 for injecting air are arranged at the station II where the printing process is performed. Has been. And a pair of suction cups 31 and 31 which implement an opening process are arrange | positioned in the station III with the additional nozzle (2nd nozzle) 44. FIG. The pair of fall prevention members 41 and 41 and the pair of suction cups 31 and 31 are respectively attached to arms (not shown) similar to the arms 32 and 32 of FIG. It is supposed to move. The structure of the fall prevention members 41 and 41 includes the parallel plane parts 42 and 42 and the inclined parts 43 and 43 as in the fall prevention members 21 and 21 in the first embodiment. , 24 is not provided.

次に図４を参照してステーションＩＩでの予備開口工程における動作について説明する。図４（Ａ）は袋ＢがステーションＩＩに移送された直後の状態を示しており、（Ｂ）は予備開口を行っている状態を示している。 Next, the operation in the preliminary opening process at the station II will be described with reference to FIG. 4A shows a state immediately after the bag B is transferred to the station II, and FIG. 4B shows a state where a preliminary opening is performed.

グリッパー３３に把持されて袋ＢがステーションＩＩに移送されてきて停止する（図４（Ａ））。袋ＢがステーションＩＩに到達して停止すると、或いは袋Ｂの移動の妨げにならない限りにおいてその到達前のある時点において、退避位置にあった倒れ防止部材４１，４１が作用位置への移動を開始する。そして倒れ防止部材４１，４１が袋Ｂの両側でそれぞれ作用位置に到達すると停止する（図２（Ｂ））。その際、倒れ防止部材４１，４１がそれぞれ作用位置に到達する前或いは到達後に所定のタイミングで第１ノズル２７からエアーの噴射が開始され、袋口へエアーを吹き付け、これにより密着した袋口を解す。そして倒れ防止部材４１，４１が所定の時間だけ作用位置に留まる間、第１ノズルでのエアーの噴射を継続し、さらに袋口の密着状態をさらに解す（図２（Ｂ））。そして倒れ防止部材４１，４１が退避位置への移動を開始すると、第１ノズルはエアーの噴射を停止する。倒れ防止部材４１，４１が退避位置へ到達して停止するのに前後して、袋Ｂは次のステーションＩＩＩに移送される。以上が予備開口工程である。 The bag B is gripped by the gripper 33 and transferred to the station II to stop (FIG. 4A). When the bag B reaches the station II and stops, or as long as it does not hinder the movement of the bag B, the fall prevention members 41, 41 at the retracted position start moving to the working position at a certain point before the arrival. To do. Then, when the fall prevention members 41 and 41 reach the operating positions on both sides of the bag B, they stop (FIG. 2B). At that time, before or after the fall prevention members 41 and 41 reach the working position, air injection is started from the first nozzle 27 at a predetermined timing, and air is blown to the bag mouth, thereby closing the bag mouth tightly contacted. To understand. Then, while the fall prevention members 41 and 41 remain in the operating position for a predetermined time, the air injection from the first nozzle is continued, and the contact state of the bag mouth is further solved (FIG. 2B). And if the fall prevention members 41 and 41 start the movement to a retracted position, a 1st nozzle will stop the injection of air. The bag B is transferred to the next station III before and after the fall prevention members 41, 41 reach the retracted position and stop. The above is the preliminary opening process.

一対の吸盤３１，３１による開口工程は先の第１の実施形態での説明から明らかであるが、以下に簡単に説明する。袋がステーションＩＩＩに移送されて停止するのに前後して、退避位置にあった一対の吸盤３１，３１は作用位置への移動を開始する。吸盤３１，３１が作用位置に到達すると到達するのに前後して吸盤３１，３１には真空が作用し、作用位置に停止した吸盤３１，３１は袋Ｂの両側に吸着する。次いで吸盤３１，３１が退避位置への移動を開始し、それに伴ってグリッパー３，３が互いに接近し始め、袋口を開口し始める。その際に、第２ノズル４４からエアーが袋Ｂ内へ吹き込まれ、袋口の開口を促進する。そして吸盤３１，３１が退避位置に向かって移動する途中で袋口が十分に開口され、その時点においてグリッパー３，３が停止され、第２ノズル４４からのエアーの噴射も停止され、また吸盤３１，３１への真空の作用も停止されて吸盤３１，３１は袋Ｂから離れる。吸盤３１，３１はさらに移動を続け、退避位置に到達すると停止する。以上が開口工程である。そして、袋口が開口した状態で袋Ｂは次のステーションに移送される。 The opening process by the pair of suction cups 31, 31 is clear from the description in the first embodiment, but will be briefly described below. Before and after the bag was transferred to the station III and stopped, the pair of suction cups 31 and 31 in the retracted position start moving to the working position. A vacuum is applied to the suction cups 31 and 31 before and after the suction cups 31 and 31 reach the operating position, and the suction cups 31 and 31 stopped at the operating position are adsorbed on both sides of the bag B. Next, the suction cups 31 and 31 start moving to the retracted position, and accordingly, the grippers 3 and 3 start to approach each other and start opening the bag mouth. At that time, air is blown into the bag B from the second nozzle 44 to promote opening of the bag mouth. The bag mouth is sufficiently opened while the suction cups 31 and 31 are moving toward the retracted position. At that time, the grippers 3 and 3 are stopped, the injection of air from the second nozzle 44 is also stopped, and the suction cup 31 is also stopped. , 31 is also stopped, and the suction cups 31, 31 are separated from the bag B. The suction cups 31, 31 continue to move and stop when they reach the retracted position. The above is the opening process. Then, the bag B is transferred to the next station with the bag mouth opened.

なお、上記の各実施の形態では一対の倒れ防止部材、２１，２１，４１，４１は互いに接離することにより作用位置と退避位置との間を移動したが、これに限定されない。例えば、作用位置から両者の間隔はそのままで上方へ退避してもよい。その際に、ノズルとの干渉が生じないようにノズルが２７が倒れ防止部材２１，２１，４１，４１と一緒に上下動するようにしてもよい。   In each of the above-described embodiments, the pair of fall prevention members 21, 21, 41, 41 move between the operating position and the retracted position by moving toward and away from each other, but the present invention is not limited to this. For example, the distance between the two may be retreated upward from the operating position. At that time, the nozzle 27 may fall down and move together with the prevention members 21, 21, 41, 41 so that interference with the nozzle does not occur.

Claims (10)

左右一対のグリッパーで袋の両側縁部を把持し、水平面内の所定の移動軌道に沿って該袋を移送しながら被包装物の袋詰めを行う袋詰め包装における袋の袋口開口方法において、
袋口が閉じた状態で両側縁部を前記一対のグリッパーにより把持された袋に対して、一対の板状の袋口倒れ防止部材を、前記袋の袋口を間に挟んでそれぞれ前記袋から所定の僅かな隙間をあけて互いに対向して位置する作用位置に配置し、前記袋の長さ方向において前記袋口の縁部に対して対向配置されたガス噴射ノズルから前記閉じた状態の袋口に向けてガスを噴射する予備開口工程と、
一対の吸着部材を前記袋の袋口の両面に吸着させ、前記予備開口工程で前記ガス噴射ノズルからガスの噴射を開始した後に、前記一対の吸着ノズルを前記袋に吸着させたまま互いに離反させと共に、前記一対のグリッパーを互いに接近させる開口工程と、
を含んでいることを特徴とする、袋口開口方法。 In the bag opening method of the bag in the stuffing packaging, which grips both side edges of the bag with a pair of left and right grippers, and stuffs the package while carrying the bag along a predetermined movement trajectory in a horizontal plane,
With the bag mouth closed, a pair of plate-shaped bag mouth fall-preventing members are respectively sandwiched between the bag mouths of the bag, with the edges gripped by the pair of grippers. The bag in the closed state is disposed from a gas injection nozzle disposed at a working position that is opposed to each other with a predetermined slight gap, and is opposed to the edge of the bag mouth in the length direction of the bag. A preliminary opening step of injecting gas toward the mouth ;
A pair of adsorption members are adsorbed on both sides of the bag mouth of the bag , and after injecting gas from the gas injection nozzle in the preliminary opening step, the pair of adsorption nozzles are separated from each other while being adsorbed on the bag. And an opening step for bringing the pair of grippers closer to each other;
The bag mouth opening method characterized by including. 請求項１記載の袋口開口方法において、前記袋は円弧軌道に沿って間欠的に移送されることを特徴とする、袋口開口方法。 2. The bag mouth opening method according to claim 1, wherein the bag is intermittently transferred along an arc orbit. 請求項１または２記載の袋口開口方法において、前記袋口倒れ防止部材は、前記作用位置と、前記作用位置から退避した退避位置との間で移動自在に構成されていることを特徴とする、袋口開口方法。 According to claim 1 or 2 the bag mouth opening method described, the bag mouth falling prevention member is characterized by being freely configured moved between said operative position, and a retracted position retracted from the operating position , Bag mouth opening method. 左右一対のグリッパーで袋の両側縁部を把持し、水平面内の所定の移動軌道に沿って該袋を移送しながら被包装物の袋詰めを行う袋詰め包装機における袋の袋口開口装置において、前記袋口開口装置は、
前記グリッパーに把持された袋の袋口を間に挟み、互いに対向して位置する一対の板状の袋口倒れ防止部材と、
前記一対の袋口倒れ防止部材に挟まれた袋の袋口の縁部に対して前記袋の長さ方向において対向して位置するガス噴射ノズルと、
前記袋の袋口に両面から吸着する吸着位置と前記袋口の両面から離れた退避位置との間で移動可能な一対の吸着部材とを備え、
前記一対の袋口倒れ防止部材は、袋口が閉じた状態で両側縁部を前記一対のグリッパーにより把持された袋に対して、前記袋の袋口を間に挟んでそれぞれ前記袋から所定の僅かな隙間をあけて互いに対向して位置する作用位置に配置され、
前記ガス噴射ノズルは、前記閉じた状態にある袋口に向かってガス噴射を開始し、
前記ガス噴射ノズルが前記閉じた状態にある袋口に向かってガス噴射を開始した後に、前記吸着部材が前記吸着位置から前記退避位置へ向かって移動し、前記グリッパーが互いに接近する
ように構成されていることを特徴とする、袋口開口装置。 In a bag mouth opening device in a bagging and packaging machine that holds a bag on both sides of a bag with a pair of left and right grippers, and packs a packaged item while transferring the bag along a predetermined movement trajectory in a horizontal plane The bag mouth opening device is:
A pair of plate-shaped bag mouth fall prevention members sandwiching the bag mouth of the bag gripped by the gripper and facing each other ;
A gas injection nozzle positioned opposite to the edge of the bag mouth of the bag sandwiched between the pair of bag mouth fall prevention members;
A pair of adsorbing members movable between an adsorbing position adsorbing from both sides to the bag mouth of the bag and a retreating position away from both sides of the bag mouth ;
The pair of bag mouth fall-preventing members are provided in a state in which the bag mouth is closed with respect to a bag gripped by the pair of grippers on both side edges from the bag. It is arranged at the working position that is located opposite to each other with a slight gap,
The gas injection nozzle starts gas injection toward the bag mouth in the closed state,
After the gas injection nozzle starts gas injection toward the closed bag mouth, the adsorption member moves from the adsorption position toward the retracted position, and the grippers approach each other.
It is comprised as follows, The bag opening apparatus characterized by the above-mentioned. 請求項４記載の袋口開口装置において、前記袋は円弧軌道に沿って間欠的に移送されることを特徴とする、袋口開口装置。   The bag mouth opening device according to claim 4, wherein the bag is intermittently transferred along an arcuate track. 請求項４または５に記載の袋口開口装置において、前記一対の袋口倒れ防止部材は、前記作用位置と、前記作用位置から退避した退避位置との間で移動自在になっていることを特徴とする、袋口開口装置。 6. The bag mouth opening device according to claim 4 or 5, wherein the pair of bag mouth fall-preventing members are movable between the operating position and a retracted position retracted from the operating position. A bag mouth opening device. 請求項６記載の袋口開口装置において、前記一対の袋口倒れ防止部材はそれぞれ前記一対の吸着部材に連結され、前記一対の吸着部材と一体的に移動することを特徴とする、袋口開口装置。   The bag mouth opening device according to claim 6, wherein the pair of bag mouth fall-preventing members are respectively connected to the pair of suction members and move integrally with the pair of suction members. apparatus. 請求項４乃至６のいずれか１に記載の袋口開口装置において、前記袋口倒れ防止部材と前記ガス噴射ノズルは、前記袋の移動軌跡に沿って前記一対の吸着部材より上流側に配置されていることを特徴とする、袋口開口装置。   The bag mouth opening device according to any one of claims 4 to 6, wherein the bag mouth fall-preventing member and the gas injection nozzle are arranged upstream of the pair of adsorbing members along a movement locus of the bag. A bag mouth opening device characterized by comprising: 請求項４乃至８のいずれか１に記載の袋口開口装置において、前記袋口倒れ防止部材は、前記袋の長さ方向において、その一端側は前記袋に対して袋口の縁部より袋底側に位置し、他端側は前記袋口の縁部を超えて延びていることを特徴とする、袋口開口装置。   The bag mouth opening device according to any one of claims 4 to 8, wherein the bag mouth fall-preventing member has one end side of the bag from the edge of the bag mouth in the length direction of the bag. The bag mouth opening device, wherein the bag mouth opening device is located on the bottom side, and the other end side extends beyond the edge of the bag mouth. 請求項９記載の袋口開口装置において、前記一対の袋口倒れ防止部材は、前記一端側の端縁部から所定の範囲で前記袋の幅方向及び長さ方向で互いに平行に延びる平行平面部と、前記平行平面部に繋がって前記他端側へ延び、前記他端側の端縁部に向かうにつれて次第に遠ざかるように逆「ハ」の字型に形成された傾斜面部とを備え、前記袋口の縁部は前記平行平面部の間に位置することを特徴とする、袋口開口装置。 10. The bag mouth opening device according to claim 9, wherein the pair of bag mouth fall-preventing members are parallel flat portions extending in parallel with each other in a width direction and a length direction of the bag within a predetermined range from an edge portion on the one end side. And an inclined surface portion formed in an inverted “C” shape so as to be connected to the parallel plane portion and extend to the other end side and gradually move away toward the end edge portion on the other end side, The bag mouth opening device, wherein an edge of the mouth is located between the parallel flat portions.
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