JP2014227186A - Bag mouth closing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag mouth closing device which dispenses with an auxiliary device provided in a post-process of the mouth closing work for an external packaging bag with an opening force blocked by forming a fold in the periphery of the mouth of the external packaging bag to be closed, and which can secure mouth closure of the external packaging bag and uniform its finish without being affected by the shape of an enclosure or inclusion volume.SOLUTION: The bag mouth closing device is provided so as to be movable forward and backward with a mouth folding expansion and shrink guide plate 2 arranged ahead of a bag mouth closing point 11 and inserted into the mouth of the external packaging bag with an enclosure to expand inside, provided so as to be movable forward and backward with side face folding plates 3, 4 that turn the right and left side faces of the mouth of the external packaging bag inside to fold them, provided so as to be movable forward and backward with an inward folding plate 5 and an outward folding plate 6 that turn one side face of the upper and lower faces of the mouth of the external packaging bag inside to fold it, and provided so as to be movable forward and backward with a folding crimp plate 7 that folds and crimps the other side face of the mouth of the external packaging bag by turning it inside.

Description

  The present invention relates to a bag mouth closing device for closing a mouth of an exterior bag containing a plurality of or one inclusion containing contents, in particular, forming a crease around the mouth to be closed of the exterior bag, By folding and closing along the crease, there is no need for an auxiliary device provided in the post-process of closing the exterior bag mouth, and the exterior bag mouth is closed without being affected by the shape or volume of the internal enclosure. The present invention relates to a bag mouth closing device that ensures a uniform finish.

Transporting inclusions containing contents such as rice, sugar, salt, etc., pet food, pet goods such as cat sand, fertilizer, feed, chemical products, etc. In such a case, for the convenience of handling in transportation, these inclusions are often collected and transported in an outer bag.
A series of operations in which a plurality or one inclusion is put in an outer bag and the mouth is closed is automatically performed by using the device, and a part of the series of devices includes a plurality of or one item. A bag mouth closing device is provided as a device for automatically closing the mouth of the outer bag containing the inclusion.
The exterior bag that puts a plurality or one of the inclusions inside is an opening that is three-dimensionally deformed from a state in which the inside is folded flat to a three-dimensional state having an internal space immediately before the inclusion is put in. A plurality or one of the inclusions are pushed into the interior space from the mouth portion of the outer bag to be closed, and then the mouth of the outer bag to be opened is automatically closed by the bag mouth closing device. The open mouth of the exterior bag that is closed by the bag mouth closing device has a rectangular shape when viewed from the front.
The bag mouth closing device first bends the left and right sides of the square-shaped mouth of the outer bag inward, then bends the upper surface of the outer bag mouth downward, and finally bends the lower surface of the outer bag mouth upward. The mouth of the outer bag is closed. The adhesive is applied in the width direction on the inner side of the lower surface of the lower surface of the mouth of the outer bag that is folded last, or is applied just before the mouth is closed, and the upper surface of the upper surface where the adhesive is folded immediately before the mouth is closed. It adheres to the outer surface and prevents the mouth of the closed outer bag from opening.

JP-A-2005-343513

However, in the conventional bag mouth closing device, when the mouth of the outer bag is folded and closed, the outer bag is folded along the outer shape of the inner enclosure that is in contact with the bent portion. The inclusions containing the contents are generally rounded at the outer corners, so when the upper surface of the rectangular mouth of the outer bag is folded downward, it is put inside the outer bag. It is bent along the roundness of the corner of the inclusion. Therefore, the folded part of the upper surface of the square-shaped mouth of the outer bag is not formed with a creased corner, and the folded upper surface tries to open the restoring force to return to the original state before being folded, that is, upward. The power to do is easy to occur. Similarly, the folded portion of the lower surface of the rectangular mouth of the exterior bag is also folded along the roundness of the corner of the enclosure, so that a corner fold is not formed, and the folded lower surface is the original before being folded. Therefore, a restoring force for returning to the state, that is, a force for opening downward tends to occur.
At this time, as described above, the adhesive is applied to the inner surface of the lower surface of the mouth of the outer bag, and the adhesive surface is in close contact with the outer surface of the upper surface to prevent the closed mouth from opening. However, when a fold with a corner is not formed in the bent portion, there is a reality that a restoring force for returning to the original state before bending, that is, a force for opening, is likely to occur. For this reason, the mouth of the outer bag is pressed several times by a separately provided auxiliary device in the subsequent step of the outer bag closing operation of the outer bag by the bag mouth closing device. Adhesive applied to the surface is sufficiently adhered to the outer surface of the corresponding upper surface so that the mouth of the closed outer bag is not reopened.

  The present invention has been devised in view of the problems as described above, and has been devised to solve the problems. The object of the present invention is to form a crease around the mouth to be closed of the outer bag, and to fold the crease. Bending along the line prevents the opening force from being generated, and makes the adhesive surface applied to the inner surface of one side of the mouth of the outer bag sufficiently adhere to the outer surface of the other side. This eliminates the need for an auxiliary device that is provided in the post-process of closing the mouth of the outer bag, and ensures that the outer bag is closed without being affected by the shape or volume of the inner enclosure, and the finish is uniform. An object of the present invention is to provide a bag closing device that can be used.

  In order to achieve the above object, the present invention provides a bag mouth closing place in which the outer bag is temporarily held during the operation of closing the open mouth of the outer bag containing the inclusion, and the bag mouth is closed. A mouth fold expansion / contraction guide plate that is inserted in the rectangular mouth of the outer bag containing the inclusion and placed in the front side of the place and extends in a vertical plane shape with respect to the inclusion inside the outer bag. It is provided so that it can be moved forward and backward toward the mouth, and after inserting the mouthfold expansion / contraction guide plate into the exterior bag mouth, the mouthfold expansion / contraction guide plate that is expanded inside and the left and right sides of the rectangular mouth of the exterior bag are sandwiched from inside and outside. Side folding plates that bend inward are provided on both sides of the bag mouth closure so that they can move forward and backward toward the mouth of the outer bag, and one of the upper and lower faces of the square mouth is expanded inside after insertion. Inner fold that is folded inward across the inner and outer guide plates And the outer folding plate is provided so as to be movable forward and backward toward the mouth of the outer bag held at the bag mouth closing place, and the other one of the upper and lower surfaces of the square mouth is expanded inside after being inserted. A folding and crimping plate that is folded inward across the guide plate from the inside and outside and that is crimped toward the one side after the mouthfold expansion / contraction guide plate is withdrawn from the inside of the exterior bag mouth is held at the bag mouth closing place. It comprises means provided so as to be able to advance and retreat toward the mouth of the exterior bag.

  According to the bag mouth closing device according to the present invention comprising means for solving the problems, the mouth fold expansion / contraction guide plate that expands inside the mouth of the exterior bag is provided so as to be able to advance and retract, so that the mouth can be opened during insertion and withdrawal. Since the folding / reducing guide plate is reduced, it can be inserted without hitting the inner peripheral edge of the mouth of the outer bag, and can be smoothly withdrawn from the inside of the mouth and taken out to the outside. When folding around the mouth of the outer bag, there is a mouth fold expansion / contraction guide plate inside the mouth, so that the inner shape of the inside of the outer bag is not affected by the outside shape of the inclusion. A fold can be formed by being folded from the inside and outside by a mouth fold expansion / contraction guide plate and an outer side fold plate, an inner fold plate, an outer fold plate, and a fold crimp plate, and bend and close along the fold. In order to prevent the force to open, the adhesive applied on the inner surface of one side of the mouth of the outer bag is sufficiently adhered to the outer surface of the corresponding other side, and the mouth of the outer bag Auxiliary equipment provided in the post-closing process is unnecessary, and the mouth of the outer bag can be securely closed and the finish can be made uniform without being affected by the shape or volume of the internal enclosure. Has beneficial effects Than is.

It is a side view of a bag mouth closing device showing a form for carrying out this invention. It is a top view of a bag mouth closing device showing a form for carrying out this invention. (A) is a plan view of the fold-fold expansion / contraction guide plate showing a form for carrying out the present invention when expanded in the left-right direction, (B) is a view as viewed in the direction of the arrow (A), (C) is fold-fold expansion / contraction A plan view when the guide plate is contracted in the left-right direction, (D) is a view on the right side of FIG. (C), (E) is a view on the left side of FIG. It is a side view of an expansion / contraction guide plate. (A) is a front view of an inner folding plate and an outer folding plate showing an embodiment for carrying out the present invention, (B) is a side view of the inner folding plate, and (C) is a side view of the outer folding plate. (A) is a side view of the bag mouth closing device at the lowered position of the folding crimping plate showing the embodiment for carrying out the present invention, (B) is a side view of the bag mouth closing device at the raised position of the folding crimping plate. is there. (A)-(D) are operation | movement explanatory drawing of the bag mouth closing apparatus which shows the form for implementing this invention. (E)-(G) are operation | movement explanatory drawings of the bag mouth closing apparatus which shows the form for implementing this invention.

  Hereinafter, the present invention will be described more specifically based on embodiments for carrying out the invention described in the drawings.

  In the figure, a bag mouth closing device 1 is a device for closing an open rectangular mouth a, for example, a rectangular mouth a, of an outer bag A in which a plurality or one inclusion B is placed in the previous process. By forming a crease around the closed mouth a and folding it along the crease, an auxiliary device provided in the subsequent process of closing the mouth of the outer bag A is not required, and the internal inclusion B There is a feature that the outer bag A can be securely closed and the finish thereof can be made uniform without being influenced by the shape or the enclosed volume.

  This bag mouth closing device 1 includes a bag mouth closing place 11 in which the outer bag A is temporarily held during the operation of closing the opened mouth a of the outer bag A containing a plurality of or one inclusion B. Mouth fold expansion / contraction guide plate 2 that expands inside bag A, placed on the left and right sides of bag mouth closing place 11, and bends inward with the left and right sides of rectangular mouth a, for example, rectangular mouth a, inward. One of the upper and lower surfaces of a rectangular mouth a, for example, a rectangular mouth a, which is disposed on, for example, the upper side of the left and right side folding plates 3, 4 and the bag mouth closing place 11, for example, rectangular An inner folding plate 5 and an outer folding plate 6 that bend the upper surface of the mouth a inward, that is, downward, a rectangular mouth a, for example, a rectangular mouth, which is disposed, for example, on the lower side of the bag mouth closure 11 The other side of the upper and lower surfaces of a, for example, the lower surface of the rectangular mouth a And a like folding cover 7 is crimped toward the upper surface of the mouth a rectangular already bent the lower surface of and rectangular mouth a folded orientation.

  The bag mouth closing place 11 temporarily holds the outer bag A during the operation of closing the opened mouth a of the outer bag A in which a plurality or one of the inclusions B are carried from the previous process. It is a place to be. A roller conveyor is disposed in the lateral direction on the floor portion 11 a of the bag mouth closing place 11. The exterior bag A in which a plurality or one of the inclusions B are put inside is conveyed from the side to the bag mouth closing place 11 by this roller conveyor.

  The floor part 11a of the bag mouth closing place 11 is inclined upward, for example, by about 30 degrees on the front side. The outer bag A temporarily held at the bag mouth closing place 11 is subjected to the bag mouth closing operation in a state where the opened mouth a side is inclined upward. Since the open mouth a side of the exterior bag A is inclined upward, the internal inclusion B does not move to the open mouth a side during the bag mouth closing operation, and the operation is not hindered.

  The floor portion 11a of the bag mouth closing place 11 has a structure in which the front side tilted upward tilts downward with the rear side as the floor tilting fulcrum 11b every time the mouth closing operation of one exterior bag A is completed. Yes. As the floor portion 11a tilts downward, the exterior bag A that has been closed at the bag mouth closing place 11 slides forward with the floor portion 11a inclined downward to open the bag mouth closing place 11. It is carried out from the floor 11a to the next process.

  The mouthfold expansion / contraction guide plate 2 is disposed on the side facing the open mouth “a” of the outer bag A carried into the bag mouth closing place 11, that is, on the front side of the bag mouth closing place 11. Is inserted into the exterior bag A temporarily held in the bag. The fold-fold expansion / contraction guide plate 2 is composed of, for example, four upper and lower and left and right guide pieces 21 that extend in a vertical plane with respect to a plurality of inclusions B stacked inside or one inclusion B inside. Has been. Each guide piece 21 is formed in a plate shape, and the upper two guide pieces 21 are notched obliquely downward toward the inside at the lower side of the outer end portion. On the contrary, the lower two guide pieces 21 are cut out obliquely upward at the upper side of the outer end portion inward.

  That is, the upper and lower guide pieces 21 are horizontally V-shaped with the center of the left and right outer end portions inward, that is, in the groove where the left end portion is cut out as “>” and the right end portion is cut out as “<”. It has become. The horizontal V-shaped groove contacts the side folding plates 3 and 4 that bend the left and right side surfaces of the opening a of the exterior bag A inward when the guide piece 21 is withdrawn from the interior of the exterior bag A. This is so that the outer bag A can be smoothly pulled out without being.

  The upper, lower, left and right four guide pieces 21 are in a contracted state when waiting outside, when inserted into the exterior bag A, and when leaving the exterior bag A. In the contracted state, the upper two guide pieces 21 are inclined obliquely upward toward the front, and the left and right guide pieces 21 are closer to the center. Similarly, the two lower guide pieces 21 are inclined obliquely downward toward the front, and the left and right guide pieces 21 approach the center. When viewed from the side, the upper and lower guide pieces 21 are formed in a laterally concave V shape, that is, “<” toward the front.

  A horizontal shaft 22a is attached to the center of the front portion of the fold-folding guide plate 2 in the left-right direction. Both ends of the horizontal shaft 22a are pivotally supported on the front end side of the left and right cylinder seats 22 which are provided from the rear to the front of the mouthfold expansion / contraction guide plate 2. A lower portion of the upper guide piece 21 is pivotally supported on the horizontal shaft 22a, and an upper portion of the lower guide piece 21 is pivotally supported.

  With the horizontal shaft 22a as a fulcrum, the upper guide piece 21 opens upward, the lower guide piece 21 opens downward, and the upper and lower guide pieces 21 are formed in a vertical plane with respect to the internal enclosure B. Further, the left and right guide pieces 21 on the upper and lower sides move to the left and right outer sides along the horizontal axis 22a, respectively, and are also expanded in the left and right direction.

  A thin vertical expansion / contraction cylinder 21a is attached to the rear of each of the four guide pieces 21, and a horizontal expansion / contraction cylinder 21c is attached to the rear of the vertical expansion / contraction cylinder 21a. Yes. Since the four vertical expansion / contraction cylinders 21a are inserted into the opening a of the outer bag A, a thin shape is used. The tip of the piston rod of each thin cylinder for longitudinal expansion / contraction 21a is connected to the tip of a connecting shaft 21b attached to the center of the rear surface of each guide piece 21 so as to be rotatable vertically.

  That is, when the piston rod of each longitudinal expansion / contraction cylinder 21a extends forward, the connecting shaft 21b of the upper guide piece 21 turns downward at the tip of the piston rod and bends to connect the lower guide piece 21. The shaft 21b is bent by turning upward at the tip of the piston rod. This is because the lower end of the upper guide piece 21 is pivotally supported by the horizontal shaft 22a, and the upper end of the lower guide piece 21 is pivotally supported by the horizontal shaft 22a.

  Further, when the piston rod of each of the rear lateral expansion / contraction cylinders 21c attached in the lateral direction is extended toward the left and right outer sides, the upper and lower vertical expansion / contraction cylinders 21a, the guide piece 21, and the horizontal shaft 22a are moved to the left side. The upper and lower vertical expansion / contraction cylinders 21a, the guide pieces 21, and the horizontal shafts 22a are slid toward the right side.

  Each guide piece 21 is inclined and contracted when the piston rod of the vertical expansion / contraction cylinder 21a is extended, and is contracted toward the center when the piston rod of the horizontal expansion / contraction cylinder 21c is contracted. On the other hand, each guide piece 21 opens and is in a vertical plane state when the piston rod of the vertical expansion / contraction cylinder 21a contracts, and expands toward the left and right outer sides when the piston rod of the lateral expansion / contraction cylinder 21c extends. It becomes a state.

  That is, the piston rod of the vertical expansion / contraction cylinder 21a is contracted after the four guide pieces 21 are inserted into the exterior bag A, and the piston rod is expanded again when the piston rod is withdrawn from the interior. The piston rod of the lateral expansion / contraction cylinder 21c is expanded after each of the four guide pieces 21 is inserted into the outer bag A, and the piston rod is contracted again when the piston rod is withdrawn from the interior.

  As described above, the four corners of the upper side edge and the lower side edge of the left and right guide pieces 21 that are inserted into the outer bag A and then extended in the left-right direction in the vertical plane state are the outer bag. The opening a of the outer bag A is held in a rectangular shape by the left and right guide pieces 21 extended on the inside, corresponding to corners inside the rectangular mouth A of A.

  Each of the vertical expansion / contraction cylinders 21 a is attached to the left and right cylinder seats 22. The upper expansion / contraction cylinder 21 a of the upper guide piece 21 is attached to the upper surface side of the cylinder seat 22, and the vertical expansion / contraction cylinder 21 a of the lower guide piece 21 is attached to the lower surface side of the cylinder seat 22. As described above, the horizontal shaft 22 a is attached to the front portion of the cylinder seat 22.

  The cylinder seat 22 is divided into left and right, and the left and right cylinder seats 22 are configured to be movable in the left-right direction, and the left and right cylinder seats 22 move left and right, so that the left and right guide pieces 21 are moved in the width direction. It has a structure that can be expanded. The rear side of the left and right cylinder seats 22 is attached to the seat mounting plate 22b.

  The left and right seat mounting plates 22b to which the left and right cylinder seats 22 are mounted are mounted so as to be movable in the left-right direction. Each seat attachment plate 22b is attached to a piston rod of each lateral expansion / contraction cylinder 21c attached laterally to the left and right. As described above, when the piston rod of each lateral expansion / contraction cylinder 21c expands and contracts, the seat mounting plate 22b to which each cylinder seat 22 is mounted is movable in the left-right direction.

  The side surfaces of the left and right horizontal expansion / contraction cylinders 21c are attached to the attachment plate 23a. The left and right ends of the mounting plate 23a mounted sideways in the left-right direction are bent forward and the stoppers 23b are attached to the bent portions, respectively, and the piston rod of the lateral expansion / contraction cylinder 21c is attached. It plays a role to stop unnecessarily stretching.

  The attachment plate 23a to which the left and right lateral expansion / contraction cylinders 21c are attached is attached to the tip of the piston rod of the bag mouth advance / retreat cylinder 23 arranged toward the mouth a of the outer bag A. The bag mouth advancing / retreating cylinder 23 has a function of inserting the guide piece 21 of the mouth fold expansion / contraction guide plate 2 toward the inside of the opening a of the outer bag A and retreating therefrom. The piston rod of the bag mouth advance / retreat cylinder 23 is extended toward the inside of the opening a of the outer bag A, and is retracted from the inside of the mouth a of the outer bag A by contraction of the piston rod.

  The front end side of the bag mouth advancing / retreating cylinder 23 is attached to the bracket 24 so as to be parallel to the inclination of the floor portion 11 a of the bag mouth closing place 11. The bag mouth advancing / retreating cylinder 23 is attached such that its piston rod extends and contracts obliquely downward in parallel with the inclination of the floor portion 11a. The cylinder seat 22 and the vertical expansion / contraction cylinder 21a attached to the tip of the piston rod are also parallel to the inclination of the floor portion 11a of the bag mouth closing place 11. The guide piece 21 is perpendicular to the inclination of the floor portion 11a.

  A slide bar 25 is attached to one side of the bag opening / retreating cylinder 23 attached at an angle in parallel to the inclined cylinder 23. One end side of the slide bar 25 penetrates the cylindrical guide hole 25a and the bracket 24, and the end thereof is connected to the mounting plate 23a. One end of the cylindrical guide hole 25 a is fixed to the bracket 24. The slide rod 25 and the cylindrical guide hole 25a serve as guides when the cylinder seat 22, the cylinder 21a, and the guide piece 21 attached to the tip end side of the piston rod of the cylinder 23 for advancement and retraction of the bag mouth move along the inclination direction. Play a role.

  The bracket 24 to which the bag mouth advancing / retreating cylinder 23 is attached is attached to the lower portion of the upper horizontal mounting frame 12 that is horizontally mounted above the front side of the bag mouth closing place 11 so that the cylinder 23 is attached in an inclined state. It is attached to the suspension plate 12a attached downward in a tilted state. The suspension plate 12a is formed with a long hole in the vertical direction, and the bracket 24 is connected to the long hole with a bolt, and the mounting height can be adjusted in the vertical direction through the long hole. . Both ends of the upper horizontal mounting frame 12 to which the suspension plate 12a is attached are connected and supported by left and right upper vertical mounting frames 13 installed in the front-rear direction above the bag mouth closing place 11.

  Side-folding plates 3 and 4 are provided on the left and right sides of the outer bag A that has been conveyed at the bag mouth closing place 11. When viewed from the side of the mouthfold expansion / contraction guide plate 2, the side folding plate 3 on the left side is located on the passage when the outer bag A is conveyed to the bag mouth closing place 11, so that it is obstructive when the outer bag A is carried in. Therefore, when the left and right side surfaces of the rectangular mouth “a” of the outer bag A are folded inward, they are lowered from the upper side and come to the side surface position of the outer bag A.

  A side upper mounting movable plate 8 is provided that moves up and down on the side and upper side of the outer bag A at the bag mouth closing place 11, and the left side folding plate 3 is provided on the side of the side upper mounting movable plate 8. It is attached to the front end side of the side-folded plate attachment board 31. The side folding plate mounting board 31 is provided to be inclined obliquely upward corresponding to the floor portion 11a inclined obliquely upward at the lowered position.

  On the other hand, the right side folding plate 4 is provided on the side opposite to the carry-in side of the outer bag A when viewed from the side of the mouthfold expansion / contraction guide plate 2. That is, the right side folding plate 4 is provided on the back end side, which is the terminal end side of the roller conveyor disposed in the lateral direction at the bag mouth closing place 11. A side folding plate mounting board 41 to which the right side folding board 4 is attached is provided on the back end side, and the side folding board 4 is attached to the front end side of the side folding board installation board 41. The side folding plate mounting board 41 is provided to be inclined obliquely upward in parallel with the floor portion 11a inclined obliquely upward.

  The left and right side folding plates 3 and 4 are formed in a lateral V-shape, that is, a shape protruding in a wedge shape toward the mouth folding expansion / contraction guide plate 2 side. When the left side folded plate 3 is bent 90 degrees toward the mouth a of the outer bag A, the tip side becomes “>” when viewed from the front side, and the right side folded plate 4 faces the mouth a of the outer bag A. When bent 90 degrees, the tip side becomes “<” when viewed from the front side. The front side side folded plates 3 and 4 are adjusted so that the lateral V-shaped front end is located at the top and bottom center of the side surface of the mouth a of the exterior bag A. Further, the left and right side folded plates 3 and 4 are located at locations where the opening a of the outer bag A can be bent inward from the left and right sides at the bag mouth closing place 11. Therefore, the side folding shafts 32 and 42 that serve as fulcrums for folding the left and right side folding plates 3 and 4 are provided on the front end side of the side folding plate mounting plates 31 and 41 that are the front side of the bag mouth closing place 11. It has been. The side bending shafts 32 and 42 are provided perpendicular to the floor portion 11a of the bag mouth closing place 11 inclined obliquely upward.

  The left and right side folding plate mounting plates 31 and 41 are folded by turning the side folding plates 3 and 4 with the side folding axes 32 and 42 as fulcrums and turning the left and right sides of the mouth a of the outer bag A inward. Side bending cylinders 32a and 42a for bending are attached. When the piston rods of the side bending cylinders 32a and 42a extend, the side folding plates 3 and 4 bend inward with the side bending shafts 32 and 42 as fulcrums, and when the piston rod contracts, the original state is restored.

  In addition, the left and right side folding plate mounting boards 31 and 41 are pressed to hold the left and right side surfaces of the exterior bag A containing a plurality or one of the inclusions B behind the side bending shafts 32 and 42, respectively. Plates 33 and 43 are respectively attached. In order to arrange the left and right side surfaces of the outer bag A containing a plurality or one of the inclusions B, the holding plates 33 and 43 push the left and right side surfaces of the outer bag A from both sides. For this reason, the side folding plate mounting plates 31 and 41 to which the holding plates 33 and 43 are attached have a structure capable of moving forward and backward toward the central exterior bag A.

  The left side folding plate mounting board 31 to which the holding plate 33 is attached is slidably attached to the left side of the outer bag A on the slide girder provided on the side of the side upper mounting movable board 8. It has been. A holding cylinder (not shown) for sliding the side folding plate mounting board 31 is attached to the slide girder.

  The right side folded plate mounting plate 41 to which the holding plate 43 is attached is attached to an outer bag on a slide girder provided toward the right side of the outer bag A at the upper end of the roller conveyor at the bag mouth closing place 11. A is slidably attached to the right side of A. A holding cylinder (not shown) for sliding the side folding plate mounting board 41 is attached to the slide girder.

  The holding plate 43 attached to the right side folding plate attachment board 41 has a buffering function when the outer bag A is carried into the bag mouth closing place 11. When the outer bag A is carried in, the holding plate 43 is moved toward the inside of the bag mouth closing place 11 and waits, and when the right side surface of the outer bag A at the time of loading comes into contact with the surface of the holding plate 43. While being pushed back by this, the moment when the outer bag A is carried in is absorbed, and the outer bag A is prevented from being broken by the enclosed material B. A cushioning cylinder 41 a that moves the retaining plate 43 toward the inside of the bag mouth closing place 11 is attached to the side folding plate attachment board 41.

  An inner folding plate 5 and an outer folding plate 6 are provided, for example, which are arranged on the upper side of the bag mouth closing place 11 and bend the upper surface of the rectangular mouth a, for example, the rectangular mouth a, inward, that is, downward. ing. The inner folding plate 5 and the outer folding plate 6 are front ends of an upper folding plate mounting plate 81 provided on the upper side of the side upper mounting movable plate 8 that moves up and down at the side and above the outer bag A of the bag mouth closing place 11. Is attached to the side. The upper surface folding plate mounting board 81 is provided so as to be inclined obliquely upward parallel to the floor portion 11a inclined obliquely upward at the lowered position.

  The inner folding plate 5 and the outer folding plate 6 can be bent approximately 90 degrees inward from the upper surface of the opening a of the outer bag A at the bag mouth closing place 11 at the lowered position of the upper surface folding plate mounting plate 81. Is located. For this reason, the upper surface bending shafts 51 and 61 that serve as fulcrums for bending the inner folded plate 5 and the outer folded plate 6 are provided on the front end side of the upper folded plate mounting plate 81 on the front side of the bag mouth closing place 11. Yes.

  The inner folded plate 5 and the outer folded plate 6 are attached so as to overlap. Among these, the inner folding plate 5 forms a fold on the upper surface side of the opening a of the outer bag A, and is smaller than the outer folding plate 6 and forms a fold on the upper surface side of the outer bag A. It is provided in the vicinity to be located when bent. The inner folding plate 5 continues to bend the upper surface side of the mouth a of the outer bag A at a right angle even when the mouth folding expansion / contraction guide plate 2 is withdrawn from the inside of the outer bag A. The distance from the upper side to the lower side of the folded inner folding plate 5 is small so that 2 does not hit.

  The outer folding plate 6 is configured to completely bend the upper surface side of the opening a of the outer bag A in which the fold is formed by the inner folding plate 5 along the fold, and from above the inner folding plate 5. The distance to the lower side is large, and the entire upper surface side of the mouth a of the outer bag A can be bent. The outer folding plate 6 can be bent up to an angle of about 60% even when the mouthfold expansion / contraction guide plate 2 is inserted into the exterior bag A. The lower side of the outer folding plate 6 is partly cut off so as not to hit the vertical expansion / contraction cylinder 21a of the mouth folding expansion / contraction guide plate 2 inserted in.

  On the front end side of the upper surface folding plate mounting board 81, an upper inner folding cylinder 52 and an upper outer folding cylinder 62 for folding the inner folding plate 5 and the outer folding plate 6 with the upper folding shafts 51 and 61 as fulcrums are vertically oriented. Are attached to each. Both cylinders 52 and 62 are mounted downward on a mounting plate 82 that is mounted vertically on the front end side of the upper surface folding plate mounting board 81.

  A mounting plate 82 to which the inner folding plate 5 and the outer folding plate 6 are attached via the cylinders 52 and 62 is supported by an inner / outer folding plate lifting / lowering cylinder 82a that moves up and down in the vertical direction. The cylinder 82a can be moved up and down. That is, the inner folded plate 5 and the outer folded plate 6 are moved up and down by the inner and outer folded plate lifting cylinder 82a. The inner / outer folded plate raising / lowering cylinder 82a is mounted vertically on the front side of the upper surface folded plate mounting board 81.

  The inner / outer folded plate raising / lowering cylinder 82a is configured to fold the inner folded plate 5 and the outer folded plate 6 through the mounting plate 82 when the inner folding plate 5 and the outer folded plate 6 fold the upper opening a of the outer packaging bag A downward. After descending directly above the mouth A of the A and folding the upper side of the mouth a of the outer bag A with the inner folded plate 5 and the outer folded plate 6, the inner folded plate 5 and the outer folded plate are attached via the mounting plate 82. 6 is raised toward the upper side of the mouth a of the outer bag A.

  The upper inner folding cylinder 52 has a mechanism for releasing the folding by bending the inner folding plate 5 downward by contracting the piston rod downward and contracting the piston rod upward. Similarly, the upper surface outer folding cylinder 62 has a mechanism for releasing the folding by bending the outer folding plate 6 downward by contracting the piston rod downward and contracting the piston rod upward.

  The side upper mounting movable plate 8 provided with the side surface folding plate mounting plate 31 and the upper surface folding plate mounting plate 81 is suspended from the movable plate supporting frame 83 disposed above the side plate mounting plate 83 via the mounting plate 82. . A movable frame 83 a is provided on the base end side of the movable plate support frame 83, and the movable frame 83 a is connected at both ends to the left and right upper vertical mounting frames 13 installed above the bag mouth closing place 11. The rotating shaft 84a is fixedly supported by a bearing 84 attached to the supported upper lateral mounting frame 14. One end of an elevating drive lever 85 is fixed to the rotating shaft 84a.

  An elevating cylinder 86 for moving the side upper mounting movable plate 8 is provided on the upper horizontal mounting frame 15 whose both ends are connected and supported by the left and right upper vertical mounting frames 13 installed above the bag mouth closing place 11. It is attached downward. The other end of the lifting drive lever 85 is fixed to the tip end side of the piston rod of the lifting cylinder 86.

  The downward raising / lowering cylinder 86 has the piston rod extending downward, so that the upper side movable mounting plate 8 is moved via the raising / lowering drive lever 85, the rotation shaft 84a, the movable frame 83a, and the movable plate support frame 83. The side upper mounting movable platen 8 is lifted by lowering and the piston rod contracting upward.

  For example, a rectangular mouth a which is disposed on the lower side of the bag mouth closing place 11 and is opened on the outer bag A, for example, the lower surface of the rectangular mouth a is folded inward, that is, upward, and the upper portion of the lower surface is already folded. A folding and crimping plate 7 that crimps toward the outer surface of the upper surface of the bag A is provided. The folding crimping plate 7 is arranged on the side facing the open mouth a of the outer bag A carried into the bag mouth closing place 11, that is, on the front side of the bag mouth closing place 11. The folding and crimping plate 7 waits at a position below the mouthfold expansion / contraction guide plate 2 and closes the mouth a of the outer bag A so that the mouthfold expansion / contraction guide plate 2 does not get in the way during operation. It has a rising structure.

  The folding and crimping plate 7 includes a folding plate 71 that bends the lower surface of the open mouth a of the outer bag A inward, that is, upward, and an outer bag A that has already been folded on the upper side of the lower surface of the mouth port a of the folded outer bag A. And a crimping plate 72 that crimps toward the outer surface of the upper surface. A folding plate 71 is provided on the lower half side of the folding crimping plate 7, and a crimping plate 72 is provided on the upper half side. The folding plate 71 and the crimping plate 72 have a horizontally long rectangular plate shape. The folding plate 71 and the crimping plate 72 of the folding crimping plate 7 are provided so as to be perpendicular to the surface of the mouth a of the outer bag A inclined obliquely upward at the bag mouth closing place 11 when folded and crimped. .

  On the rear surface side of the crimping plate 72, a crimping cylinder 72a for moving the crimping plate 72 toward the folded mouth a of the outer bag A is disposed. The pressure-bonding cylinder 72a is attached such that its piston rod expands and contracts diagonally downward so as to be parallel to the inclination of the floor portion 11a. A thin cylinder is used as the crimping cylinder 72a.

  The crimping plate 72 of the outer bag A that has already been folded on the upper side of the lower surface that has been moved and folded toward the folded mouth a of the outer bag A as the piston rod of the crimping cylinder 72a extends. Crimp toward the outer surface of the top surface. After the outer bag A is folded, an adhesive is applied to the inner tip side on the lower surface side, which is the upper side, and when the upper side of the lower surface bent by the crimping plate 72 is pressed toward the outer bag A, the lower surface side The adhesive on the tip side on the inside can be bonded and crimped to the outer surface of the upper surface of the outer package A.

  The front side of the crimping cylinder 72a is attached to the attachment plate 72b. The lower part of the mounting plate 72b is inclined so that the piston rod of the crimping cylinder 72a is parallel to the inclination of the floor portion 11a, and the connecting plate 71a is attached to the upper part on the rear surface side of the lower folding plate 71. It is connected. The folding plate 71 and the crimping plate 72 are interlocked and connected through a crimping cylinder 72a, a mounting plate 72b, and a connecting plate 71a, and move up and down integrally.

  The upper end of the lower folding cylinder 73 is pin-connected to the connecting plate 71a on the rear surface side of the folding plate 71. The upper end side of the support plate 71b is pin-connected to the lower side of the connection plate 71a of the folded plate 71. When the piston rod of the bottom folding cylinder 73 is extended, the folding plate 71 and the crimping plate 72 are bent toward the mouth a of the outer bag A, and the folding plate 71 bends the lower surface of the mouth a of the outer bag A upward. The folding plate 71 and the crimping plate 72 that have been bent by the contraction of the piston rod of the lower surface folding cylinder 73 are separated from the mouth a of the outer bag A.

  The lower end of the bottom folding cylinder 73 is pin-connected to the movable frame 74. The movable frame 74 is pin-connected to the lower end side of the support plate 71b. The base end side of the movable frame 74 is fixed to a rotating shaft 75a that is supported by a bearing 75 that is attached to the lower vertical mounting plate 16 that is disposed vertically below the front side of the bag mouth closure 11. ing. One end of an elevating drive lever 76 is fixed to the rotating shaft 75a.

An elevating cylinder 77 for moving the folding crimping plate 7, that is, the folding plate 71 and the crimping plate 72, is mounted upward on the lower vertical mounting plate 16 below the front side of the bag mouth closing place 11. On the tip end side of the piston rod of the lifting cylinder 77, the other end of the lifting drive lever 76 is fixed. The upward raising / lowering cylinder 77 extends upward with its piston rod extending upward, so that the folding and crimping plate 7, that is, via the raising / lowering drive lever 76, the rotating shaft 75 a, the movable frame 74, the crimping cylinder 72 a and the support plate 71 b. The folding plate 71 and the crimping plate 72 are raised, and the piston rod is contracted downward so that the folding crimping plate 7 is lowered.

Next, the operation according to the configuration of the embodiment for carrying out the invention will be described below with reference to FIGS.
The outer bag A in which a plurality or one of the inclusions B is packed in the previous step is carried into the bag mouth closing place 11 of the bag mouth closing device 1. The outer bag A to be carried in moves laterally on a plurality of roller conveyors arranged on the floor portion 11a of the bag mouth closing place 11. The outer bag A moves while being pressed by a carry-in plate (not shown) on one side surface.

  At this time, the holding plate 43 of the right side folding plate 4 provided on the side opposite to the carry-in side of the outer bag A moves toward the carry-in side of the bag mouth closing place 11 by extension of the buffer cylinder 41b. Located inside it. The outer bag A carried in by the carry-in plate comes into contact with the holding plate 43 whose right side surface is located inside the bag mouth closing place 11. The retaining plate 43 that has come into contact with the right side surface of the outer bag A moves backward to the contact state and moves to the right end of the bag mouth closing place 11. The right side surface of the outer bag A is in contact with the surface of the retaining plate 43.

  A carry-in plate (not shown) retracts to the outside on the left side of the bag mouth closing place 11 when the outer bag A packed with a plurality or one of the inclusions B is carried into the bag mouth closing place 11. When the carry-in plate retreats away from the bag mouth closing place 11, the elevating cylinder 86 of the side upper mounting movable board 8 is operated, and the piston rod extends downward. The tip end side of the piston rod extending downward rotates the elevating drive lever 85 downward.

  When the elevating drive lever 85 rotates downward, the rotation shaft 84a to which one end of the elevating drive lever 85 is connected also rotates in the same direction. The movable frame 83a fixed to the rotating shaft 84a rotates downward. The base end side of the movable plate support frame 83 is connected to the movable frame 83a that rotates downward, and the movable plate support frame 83 rotates downward and descends. The descending movable platen support frame 83 descends just above the outer bag A.

  Further, in conjunction with the lowering of the side upper mounting movable plate 8, the bag mouth advancing / retreating cylinder 23 is also operated, and the piston rod is extended obliquely downward to open the mouth folding expansion / contraction guide plate 2 of the outer bag A. Move toward the mouth a. Four guide pieces 21 of the mouthfold expansion / contraction guide plate 2 are attached to the distal end side of the piston rod of the extending bag opening / retreating cylinder 23 via a lateral expansion / contraction cylinder 21c and a vertical expansion / contraction cylinder 21a. The four guide pieces 21 are inserted into the mouth a of the outer bag A in a contracted state in the vertical and horizontal directions. The insertion of the fold-fold expansion / contraction guide plate 2 and the lowering of the movable plate support frame 83 to the position just above the exterior bag A are performed in parallel.

  When the guide piece 21 of the fold-folding expansion / contraction guide plate 2 is inserted into the opening a of the outer bag A, each vertical expansion / contraction cylinder 21a and lateral expansion / contraction cylinder provided on the rear side of each guide piece 21 21c operates. Each vertical expansion / contraction cylinder 21a contracts its piston rod, and each horizontal expansion / contraction cylinder 21c expands its piston rod. When the piston rod of each longitudinal expansion / contraction cylinder 21a contracts, the upper left and right guide pieces 21 rotate upward with the lower end horizontal shaft 22a as a fulcrum, and are stacked inside the opening a of the outer bag A. It becomes a vertical surface with respect to a plurality of inclusions B or one inclusion B inside. Similarly, the lower left and right guide pieces 21 turn downward with the horizontal shaft 22a at the upper end as a fulcrum to form a plurality or one of the inclusions B stacked inside the opening a of the outer bag A. On the other hand, it becomes a vertical plane.

  When the upper, lower, left, and right guide pieces 21 are perpendicular to the plurality or one of the inclusions B stacked in the opening a of the outer bag A, the piston rods of the left and right lateral expansion / contraction cylinders 21c are By extending, the left and right guide pieces 21 move in the direction of expansion inside the mouth a of the exterior bag A. That is, the left upper guide piece 21 moves to the left inside the mouth a of the outer bag A, and the upper left corner of the upper guide piece 21 is the upper left corner inside the mouth a of the outer bag A. The lower end corner of the left end of the lower guide piece 21 contacts the lower left corner of the mouth a of the outer bag A. Similarly, the upper and lower guide pieces 21 on the right side move to the right inside the mouth a of the outer bag A, and the upper end corner of the right end of the upper guide piece 21 is the upper right corner inside the mouth a of the outer bag A. The lower end corner of the right end of the lower guide piece 21 is in contact with the corner, and the lower right corner of the inside of the mouth a of the outer bag A is in contact. During this time, the upper, lower, left, and right guide pieces 21 that are perpendicular to the plurality or one of the inclusions B do not come into contact with the plurality or one of the inclusions B, and damage the surface of the inclusion B. There is no.

  When the guide pieces 21 of the fold-fold expansion / contraction guide plate 2 are expanded inside the mouth a of the outer bag A, the left and right holding plates 33 and 43 move toward and contact the left and right side surfaces of the outer bag A, respectively. After contact, it retracts and contacts again. After the abutting and retreating operations are repeated several times, both side surfaces of the exterior bag A are sandwiched between the left and right holding plates 33 and 43.

  When both side surfaces of the outer bag A are sandwiched between the retaining plates 33 and 43, the upper folding plate mounting plate 81 that is separated from the upper surface of the outer bag A with a slight gap is further lowered to slightly lower the upper surface of the outer bag A. Contact with. Accordingly, the upper and lower surfaces of the outer bag A are sandwiched from above and below by the upper folding plate mounting plate 81 and the floor portion 11a, and the left and right side surfaces of the outer bag A are sandwiched from the left and right by the left and right holding plates 33 and 43. The bag A is held on both upper and lower sides and both left and right sides.

  In a state where the outer bag A is held, the left and right side folded plates 3 and 4 are operated. When the piston rods of the side bending cylinders 32a and 42a are extended, the side folding plates 3 and 4 are bent toward the mouth a of the outer bag A with the side bending shafts 32 and 42 as fulcrums. This bending operation is repeated several times.

  The side folding plates 3 and 4 are bent toward the mouth a of the outer bag A, and at the same time, the inner folding plate 5 and the outer folding plate 6 attached to the upper surface folding plate mounting plate 81 are operated to open the mouth a of the outer bag A. Bend the top surface down. Similarly, the folding crimping plate 7 is actuated to bend the lower surface of the mouth a of the outer bag A upward.

  When the piston rod of the upper inner folding cylinder 52 extends downward, the inner folding plate 5 bends toward the mouth a of the outer bag A with the upper folding shaft 51 as a fulcrum. Similarly, when the piston rod of the upper outer folding cylinder 62 extends downward, the outer folding plate 6 bends toward the mouth a of the outer bag A with the upper folding shaft 61 as a fulcrum.

  When the piston rod of the lifting cylinder 77 extends upward, the tip end side of the piston rod extending upward rotates the lifting drive lever 76 upward. When the elevating drive lever 76 rotates upward, the rotation shaft 75a to which one end of the elevating drive lever 76 is connected also rotates in the same direction. The movable frame 74 fixed to the rotating shaft 75a is rotated upward. The support frame 71b and the lower end side of the lower folding cylinder 73 are pin-connected to the movable frame 74 that rotates upward. The upper end side of the support plate 71b is connected to the folding plate 71 of the folding crimping plate 7, and the folding crimping plate 7 composed of the folding plate 71 and the crimping plate 72 rises upward, and is connected to the mouth a of the outer bag A. Bend the bottom side upwards.

  The outer folded plate 6 once bends and then returns to its original state. That is, the bending is released. Similarly, the folding crimping plate 7 once rises, bends the lower surface of the mouth a of the outer bag A upward, and then descends to the original position. On the other hand, the inner folded plate 5 continues to bend the upper surface of the mouth a of the outer bag A. Similarly, the left and right side folded plates 3 and 4 are continuously maintained in a state where both side surfaces of the mouth a of the outer bag A are folded.

  Once the outer folding plate 6 and the folding crimping plate 7 return to the original state before being folded, the mouth folding expansion / contraction guide plate 2 that has been expanded inside the mouth a of the exterior bag A is reduced and exits from the inside of the mouth a. To do. The left and right guide pieces 21 are expanded to the left and right, and the lateral expansion / contraction cylinder 21c contracts to move toward the center, and the bag mouth advancing / retreating cylinder 23 starts to retract due to the contraction of the piston rod. The piston rod extends in each longitudinal expansion / contraction cylinder 21a in conjunction with the retreat of the bag mouth advance / retreat cylinder 23.

  With the extension of the piston rod of each vertical expansion / contraction cylinder 21a, the upper left and right guide pieces 21 rotate upward with the horizontal shaft 22a at the lower end as a fulcrum, and the lower left and right guide pieces 21 are at the upper end. The outer bag is rotated forward with the horizontal shaft 22a as a fulcrum, the upper and lower guide pieces 21 are reduced to a "<" shape, and the upper surface and the left and right side surfaces of the outer bag A are folded. Exit from A's mouth a toward the outside.

  When the guide piece 21 of the mouthfold expansion / contraction guide plate 2 is withdrawn from the inside of the mouth a of the outer bag A, the outer folding plate 6 and the folding crimping plate 7 are operated again. The outer folding plate 6 is bent downward with the upper surface bending shaft 61 as a fulcrum, and the upper surface of the mouth a of the outer bag A is bent downward. The folding crimping plate 7 rising upward rises along the circular orbit. Since the folding crimping plate 7 that rises in the circular orbit rises while continuing to contact the crease on the lower surface of the mouth a of the outer bag A, a fold is formed.

  At this time, as described above, the outer folding plate 6 bends downward with the upper surface folding shaft 61 as a fulcrum, and the one folding crimping plate 7 ascends along the circular orbit as described above. When rising from the fold of the lower surface of the mouth A of the A to the upper side, the outer folding plate 6 and the folding press plate 7 can be prevented from coming into contact with each other because they move away from the mouth a of the outer bag A as they rise.

  When the folding crimping plate 7 rises to the top and the lower end of the folding plate 71 on the lower side of the folding crimping plate 7 reaches the height of the crease on the lower surface of the mouth a of the exterior bag A, the folding crimping plate 7 rises. From the position, the lower surface of the mouth a of the outer bag A is bent toward the outer surface of the upper surface of the mouth a of the outer bag A which is bent by the outer folding plate 6. When the piston rod of the bottom folding cylinder 73 extends, the folding crimping plate 7 bends around the fold on the bottom surface of the mouth a of the exterior bag A, and bends the bottom surface of the mouth a of the exterior bag A.

  At the same time that the folding crimping plate 7 starts to bend the lower surface of the mouth a of the outer bag A, the inner folded plate 5 and the outer folded plate 6 that have folded the upper surface of the outer bag A are left in a bent state. The folded and crimped plate 7 does not come into contact with the inner folded plate 5 and the outer folded plate 6.

  When the piston rod of the crimping cylinder 72a is extended with the folding plate 71 and the crimping plate 72 bent 90 degrees on the lower surface of the mouth a of the outer bag A, the upper crimping plate 72 is moved to the outer bag A. The upper side of the lower surface of the bent mouth a is pressed toward the outer surface of the upper surface of the already-folded mouth a. By pressing, the adhesive applied to the tip side inside the lower surface of the mouth a of the outer bag A is not sufficiently adhered to and peeled off from the outer surface of the upper surface of the mouth a that has already been folded.

  In this way, when the mouth closing operation of the outer bag A is completed, the piston rod of the extending crimping cylinder 72a contracts and the crimping plate 72 returns to the original position. After that, the floor portion 11a of the bag mouth closing place 11 on which the outer bag A is placed tilts downward about the floor tilting fulcrum 11b, and the outer bag A which has finished closing the mouth has a floor portion whose front side is inclined downward. It slides toward the front from 11a, and it carries out toward the next process from the bag mouth closing place 11.

  After carrying out the outer bag A whose mouth has been closed, the floor portion 11a that has been tilted downward returns to its original state. When the floor portion 11a returns to the original state, the folding crimping plate 7 is also lowered and returned to the standby position, a new exterior bag A is carried into the bag mouth closing place 11, and the same operation is repeated thereafter. .

  The present invention is not limited to the embodiment for carrying out the invention, and it goes without saying that various modifications can be made without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 Bag mouth closing device 11 Bag mouth closing place 11a Floor part 11b Floor tilting fulcrum 12 Upper horizontal mounting frame 12a Suspension plate 13 Upper vertical mounting frame 14 Upper horizontal mounting frame 15 Upper horizontal mounting frame 16 Lower vertical mounting plate 2 Guide plate 21 Guide piece 21a Vertical expansion / contraction cylinder 21b Connecting shaft 21c Horizontal expansion / contraction cylinder 22 Cylinder seat 22a Horizontal shaft 22b Seat mounting plate 23 Bag port advance / retreat cylinder 23a Mounting plate 23b Stopper 24 Bracket 25 Slide rod 25a Cylindrical guide hole 3 Side-folded plate 31 Side-folded plate mounting plate 32 Side-folded shaft 32a Side-folded cylinder 33 Holding plate 4 Side-folded plate 41 Side-folded plate mounting plate 41a Buffer cylinder 42 Side-folded shaft 42a Side-folded cylinder 43 Pressed Plate 5 Inner folding plate 51 Upper surface bending shaft 52 Upper surface inward folding series 6 outer folding plate 61 upper surface bending shaft 62 upper surface outer folding cylinder 7 folding crimping plate 71 folding plate 71a connecting plate 71b support plate 72 crimping plate 72a crimping cylinder 72b mounting plate 73 bottom folding cylinder 74 movable frame 75 bearing 75a times Moving shaft 76 Elevating drive lever 77 Elevating cylinder 8 Side upper mounting movable plate 81 Upper folding plate mounting plate 82 Mounting plate 82a Inner / outer folding plate lifting cylinder 83 Movable plate support frame 83a Movable frame 84 Bearing 84a Rotating shaft 85 Elevating Drive lever 86 Cylinder for elevating and lowering A A exterior bag a port B inclusion

Claims (2)

During the operation of closing the open mouth of the outer bag containing the inclusion, a bag mouth closing place is provided in which the outer bag is temporarily held, and the opening is placed on the front side of the bag mouth closing place. A mouth fold expansion / contraction guide plate that is inserted into the rectangular mouth of the exterior bag and expands in a vertical plane with respect to the enclosed material inside the exterior bag is provided so as to be able to advance and retract toward the mouth of the exterior bag. After inserting the plate into the exterior bag mouth, close the bag mouth with the mouthfold expansion / contraction guide plate that expands inside and the side folding plate that is sandwiched from inside and outside and bends the left and right sides of the exterior bag square inward. It is provided on both sides of the bag so that it can be moved forward and backward toward the mouth of the outer bag, and one side of the upper and lower sides of the square mouth is extended inside and inside from the inside and outside with a mouth folding expansion / contraction guide plate The inner folded plate and outer folded plate that are bent toward the A mouth fold expansion / contraction guide plate that is provided so as to be able to advance and retreat toward the mouth of the exterior bag, and that the other one of the upper and lower surfaces of the square mouth is expanded inside after insertion, and is folded inward by sandwiching from inside and outside. A folding and crimping plate for crimping toward the one side after the folding expansion / contraction guide plate exits from the inside of the exterior bag mouth is provided so as to be movable forward and backward toward the mouth of the exterior bag held at the bag mouth closing place. The bag mouth closing device characterized. The bag mouth closing device according to claim 1, wherein the inner folding plate and the outer folding plate are provided on the upper side of the mouth of the outer bag, and the folding crimping plate is provided on the lower side of the mouth of the outer bag.

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