JPH0729641B2 - Container opening straightening device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention fills a rectangular box-shaped container made of a sheet material whose base material is paper, plastic or the like with contents and then opens the container opening. TECHNICAL FIELD The present invention relates to a container opening curling device for curling for closing.

[Conventional technology]

Conventionally, for packaging liquid foods such as milk and juice,
Box-shaped containers and bag-shaped containers made of sheet materials such as paper and plastic are often used. As a liquid packaging device using these containers, a strip-shaped sheet material having a heat-adhesive resin coating on both sides is unwound from a raw roll, the strip-shaped sheet material is folded in two in the longitudinal direction, and an appropriate space is provided in the longitudinal direction. A bag-shaped container with one end opened is formed by laterally sealing and then cutting and separating the strip-shaped sheet material in the lateral direction. The bag-shaped container is formed into a box-like shape, and then the container is filled with the contents. Apparatuses for filling and sealing objects are known (Japanese Patent Laid-Open Nos. 60-204424 and 61-8190).
See No. 5).

By the way, in such a device, it is necessary to seal the mouth of the container after filling the contents into the box-shaped container and mold it into a box-shaped container. Therefore, prior to the sealing, a ruled line formed in advance in the container opening ( Folding is performed along the creases. Conventionally, in order to perform this quirky folding, first, the container is stopped at one operating position, the container opening is opened laterally from the inside, and both ends of the container are spread out in a triangular shape, and then the container is moved to the next operation. There was a two-step operation in which it was moved to a position and stopped, and at that position the container opening was closed from both sides by a pair of holding plates.

[Problems to be solved by the invention]

However, as described above, in the configuration in which the container opening is bent in two operating positions, at least two container stopping positions are required, and the length of the container traveling portion for filling and sealing the container is long. There is a problem that the device becomes complicated and expensive because it requires a device for folding each operation device. Further, in the above configuration, even if the container opening is expanded laterally, the container tends to return to its original state due to the restoring force of the container itself while the container is being conveyed to the next operating position. There was also a problem that when the container opening was sandwiched from both sides, both ends of the opening could not be properly folded into a triangular shape.

The present invention has been made in view of the above problems, and the upper opening of the box-shaped container filled with the contents is provided at one stop position.
An object of the present invention is to provide a container opening curling device capable of favorably curling.

[Means for solving problems]

The present invention, which has been made to achieve the above-mentioned object, is a peculiar folding device for peculiarly folding in order to seal the upper end opening of a box-shaped container having an open upper end, and an elevating block capable of moving up and down above the container, A pair of rocking levers held by the lifting block so as to rock, a holding plate held at the lower end of each rocking lever to close the container opening, and a drive means for rocking the rocking levers in opposite directions. , A pair of claws held by the elevating block so as to be swingable in a direction perpendicular to the swing direction of the swing lever and widening the upper end opening of the container in the lateral direction, and the pair of claws are normally retracted inward. A spring that biases the position,
It has an operating lever connected to the pair of pawls, and a pawl operating elevating rod that engages with the operating lever and pivots the pair of pawls outward when the elevating block descends. The gist is the container opening curl folding device.

[Action]

In the straightening device having the above structure, when the container stops below the lifting block, the lifting block descends, and first, a pair of claws are inserted into the container, and at the same time, a lifting rod for manipulating the claws arranged at both ends of the container. Rise to engage the operating lever to pivot the pair of pawls outward, and the pawls open both ends of the container opening to the outside. Next, the pair of rocking levers actuate to move the pair of pressing plates held at the lower ends thereof toward each other, and the upper end of the container opening is sandwiched from both sides to be closed. At this time, the pawl operating lift rod may be moved downward to pivot the pair of pawls to their original positions and to be retracted to a position where they cannot be pinched by the pair of holding plates. After that, the elevating block is further lowered while the container opening is closed by the pair of pressing plates, and the corners of the upper end of the container and the corners of the sealing part are bent and folded. After that, the swing lever swings to open the pair of holding plates, and the lifting block rises to its original position to complete one operation. Thus,
At one container stop position, the container opening can be bent in a single descending and ascending cycle of the lifting block.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 5 is a perspective view schematically showing a liquid packaging device equipped with a container opening curling device according to an embodiment of the present invention. In the figure, 1 is a strip-shaped sheet material having paper as a base material and thermoplastic resin coating on both sides, 2 is a raw roll formed by winding the strip-shaped sheet material, 3 is a guide roller, 4 is a straw punching device, 5
Is a pull tab tape applying device, 6 is a pull tab tape winding device, 7
Is a date printing device, 8 is a ruled line pressing device, 9 is a first constant feed roller for intermittently feeding a predetermined amount of strip-shaped sheet material, 10
Is a dancer roller for adjusting tension, 11 is a germicidal lamp, 12 is a sheet folding device for folding the strip-shaped sheet material in two, and 13 is a laterally sealed strip-shaped sheet material 1 which forms a seal portion 14. A sealing device, 15 is a direction changing roller, 16 is a second constant-size feed drive roller that intermittently conveys a predetermined amount of a strip-shaped sheet material, and 17 is a cutting device that separates the end of the strip-shaped sheet material into a bag-shaped container 18.

Reference numeral 20 denotes a molding device for expanding the bag-shaped container 18 and molding it into a box-shaped container, and a rotary table 22 radially provided with a mandrel 21 that holds the bag-shaped container 18 and can be opened and closed. When,
Forming means (not shown) and the like arranged around it are provided. Reference numeral 24 denotes a container transporting device in which a U-shaped carrier 25 holding the box-shaped container 18 is connected endlessly, and is configured to be intermittently driven in the arrow direction. S1 to S12 indicate stations for performing a predetermined process on the container held in the carrier 25 of the container transporting device 24, and each station is provided with a means for performing a predetermined process. Illustration is omitted. The details of the processing will be described later. 26 is a discharge conveyor.

The container opening peculiar folding device according to the embodiment of the present invention is arranged at the station S4, and its details are shown in FIGS. 1A and 1B.
This is shown in Figures 2A and 2B. In the figure, reference numeral 30 indicates the entire container opening curling device. Reference numeral 31 is an elevating block, which can be moved up and down by a driving device (not shown).
Reference numeral 34 denotes a pair of rocking levers provided on the lifting block 31 so as to be rockable by pins 33, and a pressing plate 35 is fixed to the lower end of the rocking levers. Pin 33 is a container 18 held in a carrier 25
Are arranged at right angles to the traveling direction of the container, and therefore the pair of holding plates 35 swing parallel to the traveling direction of the container 18 and sandwich the upper edges (front and rear in the container advancing direction) on both sides of the container opening. Can be brought into contact with each other. Reference numeral 37 denotes a drive rod connected to a drive mechanism such as an air cylinder, which reciprocates vertically with respect to the elevating block 31 and swings a pair of swing levers 34 in opposite directions via a link 38. Open and close the holding plate 35.

Reference numeral 40 denotes a bracket fixed to the lifting block 31 and rotatably holds a pair of shafts 41 parallel to the traveling direction of the container. A thin claw 42 is fixed to each shaft 41 at a position to be inserted inside the container 18, and an operation lever 43 is fixed to the outside. Furthermore,
A spring (not shown) that biases the pawl 42 to the inwardly retracted position shown in FIG. 1A on any of the shaft 41, the pawl 42, and the operating lever 43.
The claw 42 is normally in a position retracted inward, but can be swung outward by pushing up the operation lever 43. Reference numeral 45 is a lifting rod for manipulating the claws arranged on both sides of the traveling position of the carrier 25.
Is arranged at a position to push up from below. The lifting rod 45 is a lifting rod 45A that is lifted and lowered by a driving device (not shown), a connecting member 45B attached to the upper end thereof, and a connecting member.
Head 45C movably held with respect to 45B, and the head 45C
It consists of a spring 45D that pushes C upward, and when it goes up, the head 45C pushes up the operating lever 43 and acts so as to pivot the pair of claws 42 outward. At this time, the head 45
Since C can be retracted against the force of the spring 45D, it is possible to prevent damage to both ends of the container due to an excessive force acting on the claw 42 when the both ends of the container opening are opened outward by the claw 42.

Reference numerals 50 are guide plates arranged on both sides of the traveling position of the carrier 25 and near the upper end of the carrier.

Reference numeral 51 is an opening prevention device disposed downstream of the container opening curl folding device 30, and a presser bar 53 having a fork 52 at its lower end is connected to an elevating air cylinder 54. As shown in FIG. 3, the holding bar 53 is arranged above the guide plates 50 arranged on both sides of the carrier traveling position.

Next, the operation of the container opening curl folding device 30 and the opening prevention device 51 having the above-described configurations will be described.

The U-shaped carrier 25 has a box-shaped container 18 having the shape shown in FIG. 4B.
However, it is held in an upright state with the upper end opening facing upward, and after being filled with contents on the way, it moves directly below the curly folding device 30. At this time, the elevating block 31 is in the raised position, and the holding plate 35 and the claws 42 do not come into contact with the container 18. When the container 18 reaches a predetermined position and stops in this state, the elevating block 31 descends to the position shown in FIGS. 1A and 2A, and the pair of claws 42 is inserted into the opening of the container 18. Then lift rod
45 rises and pushes up the operation lever 43, and opens the pair of claws 42 outward. As a result, as shown in FIG.
Pushes both ends of the container opening outward. Next, the lifting rod
45 descends to release the operation lever 43, restore the pair of pawls 42 to their original positions by the force of the spring, and drive rod 37
Lowers and closes the pair of pressing plates 35 via the link 38 and the swing lever 34. As a result, as shown in FIG. 2B, the holding plate 3 closes the upper edge of the container opening by sandwiching it and folds the container opening. At this time, since the pair of claws 42 have returned to the original position shown by the chain double-dashed line in FIG. 1B, they are not sandwiched by the holding plate 35 and only the upper edge of the container is pinched by the holding plate 35. . Next, while the container opening is sandwiched by the holding plate 35, the elevating block 31 is further lowered, the folds of the container opening are bent more reliably, and the triangular flaps 18C (4th side) on both sides are folded.
(See Fig. C) and press it against the guide plate 50, and also fold it. By this operation, the opening of the container 18 is bent as shown in FIG. 4C. That is, the container opening is widened on both sides to form a triangular flap 18C, and the folds 18D and 18E that form the corners of the upper end of the container and the folds that define the sealing portion.
The fold line 18G, which is the outer circumference of the 18F and triangular flap 18C, is bent and foldable.

In the above-described embodiment, after the pair of claws 42 that spread the container opening on both sides are retracted, the container opening is sandwiched by the pair of holding plates 35. This configuration is suitable because it can be folded easily because only the container is sandwiched by the holding plate. However, the present invention is not limited to this case, and the pair of claws 42 can be used.
It may be configured such that the holding plate 35 is operated and the container opening is sandwiched with the container open. In this case, presser plate 35
When the upper edge of the container is pinched with the claw 42, the claw 42 may be clamped together, or the pressing plate 35 corresponding to the claw 42 may be used.
It is also possible to cut out the portion of and to prevent the claw 42 from being pinched.

As shown in FIG. 2B, the curling device 30 of the station S4
The container 18 that has been folded at is sent to the sealing station (not shown) downstream thereof by the carrier 25, but the opening that is closed due to the restoring force of the container material tends to open greatly during the process. is there. Opening prevention device 51
Is to prevent this, the presser bar 53 is lowered by the air cylinder 54, and as shown in FIG. 3, the triangular flap 18C at the upper end of the container is pressed against the upper surface of the guide plate 50 and folded again at the container opening. Attach. Instead of independently driving the presser bar 53 by the air cylinder 54, the presser bar 53 may be held by the adjoining elevating block 31 of the peculiar folding device 30, and the elevating block 31 may be elevated and lowered. The opening prevention device 51 may be omitted when the container is not restored so much.

Next, the operation of the entire liquid packaging device including the container opening curling device 30 having the above structure will be described. In FIG. 5, the strip-shaped sheet material 1 is fed from the original roll 2 and is intermittently fed by the fixed-dimension feed drive roller 9 to a fixed dimension. On the way, various processes are applied while the strip-shaped sheet material 1 is stopped. That is, first, a straw hole is formed in the band-shaped sheet material 1 from the inner surface side of the band-shaped sheet material 1 by the straw hole punching device 4, and a puller tape is applied to the outer surface of the straw hole by the pull tab tape applying device 5. Thereafter, the date is printed by the date printing device 7 on the strip-shaped sheet material 1 to which the pull tab tape is attached, and the ruled lines are formed by the ruled line pushing device 8. These ruled lines form folds when molding into a box-shaped container.

The strip-shaped sheet material 1 that has passed the first drive roller 9 is intermittently fed by the second drive roller 16 at a constant size. At this time, the constant-size feed by the first drive roller 9 and the constant-size feed by the second drive roller 16 are theoretically performed at the same timing. Since the dancer roller 10 is interposed between the two, the vertical movement of the dancer roller 10 absorbs the error in intermittent feeding by both drive rollers. Dancer roller 10
The strip-shaped sheet material 1 that has passed through is first sterilized on the inner surface side by a sterilization lamp 11, and then the sheet folding device 12
It is folded in two by means of a seal device 13 and laterally sealed by a sealing device 13 at a predetermined interval. The direction is changed by the direction changing roller 15 in the horizontal direction. The cutting device 17 cuts the center of the seal portion 14 to separate it. As a result, as shown in FIG. 4A, the bag-shaped container 18 having the seal portions 18A at both ends and having the straw hole 60 and the pull tab tape 61 attached thereon is formed.

Next, the bag-shaped container 18 is put on the mandrel 21 of the forming device 20, expanded while rotating with the mandrel 21, the end opposite to the opening is formed flat, and then the body is rectangular. It is shaped into a box-shaped container 18 as shown in FIG. 4B. The molded box-shaped container 18 is transferred from the mandrel 21 to the carrier 25 located at the station S1.

While the box-shaped container 18 held by the carrier 25 is held by the carrier 25 and intermittently travels, the box-shaped container 18 is pushed into a predetermined position with respect to the carrier 25 in the station S2, filled with the contents in the station S3, and then in the station S4. As described above, it is molded into the shape for closing the upper opening (see Fig. 4C), that is, it is folded at each fold, and the upper opening is sealed at stations S5 and S6 to form the shape shown in Fig. 4D. . Next, at stations S7 and S8, the upper end is formed flat and the upper and lower triangular flaps are bent upward, and at station S9, the resin on the inner surface of the triangular flap and the outer surface of the container to be joined to it is heated and melted, and station S1
At 0, each triangular flap is pressed and adhered to the outer surface of the container, the upper surface and both side surfaces of the container 18 are pressed at the station S11, and the entire container is molded into the state shown in FIG. 4E. Is discharged.

The container placed on the discharge conveyor 26 is sent to a post process, and is put into a product through a process such as packaging.

In the above embodiment, the container opening curling device 30 of the present invention is used.
Is provided in a liquid packaging device that manufactures a box-shaped container from a band-shaped sheet material having paper as a base material, and fills and seals the liquid, but the present invention is not limited to this case, and the box-shaped container is formed in advance. Needless to say, it may be applied to a device that supplies this box-shaped container, fills it, and seals it.

〔The invention's effect〕

As described above, in the container opening curl folding device of the present invention, since the elevating block is provided with the pair of pawls that open the container opening laterally outward and the pair of holding plates that close the container opening. , At the same position, the container opening can be opened laterally to form a triangular flap, and then the container opening can be closed to give the necessary folds to the container opening, simplifying the device and filling, sealing and shaping. This has the effect of shortening the required length of the container traveling portion for performing the steps such as.

[Brief description of drawings]

1A and 1B are cross-sectional views of a container opening curling device according to an embodiment of the present invention as seen from the direction of travel of the container. FIGS. 2A and 2B show the container opening curling. FIG. 3 is a cross-sectional view of the folding device viewed from a direction perpendicular to the container traveling direction, showing different operating states. FIG. 3 is a view of the opening prevention device disposed adjacent to the container opening curl folding device viewed from the container traveling direction. FIG. 4A to FIG. 4E are perspective views showing an intermediate state of a container manufactured by the liquid packaging device described later, and FIG. 5 is a schematic view showing a liquid packaging device equipped with the container opening curling device. It is a perspective view. 18 …… Box-shaped container (bag-shaped container) 30 …… Container opening curl folding device 31 …… Lifting block, 33 …… Pin 34 …… Swing lever, 35 …… Holding plate 41 …… Shaft, 42 …… Claw 43 …… Actuating lever, 45 …… Claw operating lift rod 50 …… Guide plate

Claims (1)

[Claims] 1. A peculiar folding device for peculiarly folding to close an upper opening of a box-shaped container having an open upper end,
An elevating block capable of ascending and descending above the container, a pair of rocking levers held so as to rock on the elevating block, a holding plate for closing the container opening held at the lower end of each rocking lever,
A pair of drive means for swinging the swing levers in opposite directions and a pair of a pair of lift blocks that are swingably held at right angles to the swing direction of the swing levers and that widen the upper end opening of the container in the lateral direction. A claw, a spring for urging the pair of claws to a position that is normally retracted inward, an operation lever connected to the pair of claws, and an engagement lever that engages with the operation lever when the lifting block descends. And an elevating rod for operating a claw that pivots a pair of claws outwardly.