JP7185362B1 - Film packaging machine and film packaging method - Google Patents

Abstract

To provide a film packaging machine and a film packaging method capable of packaging each package without causing collapse of the package, even when packaging a stack of packages in which a plurality of packages are stacked in the vertical direction. do. SOLUTION: In step S3, a carriage 9 is raised while supplying a packaging film F to the side surface of a laminated body P to be packaged, and a turntable 5 is rotated, so that the packaging film F is wrapped in an upward spiral shape. It is wound around the side surface of the product laminate P. In step S4, the packaging film F is supplied while the carriage 9 is raised to a predetermined position Ht higher than the laminated body P of the objects to be packaged, and at least a part of the upper surface of the laminated body P of the objects to be packaged is covered with the packaging film F. Let In step S5, the turntable 5 is rotated while the carriage 9 is lowered from the predetermined position Ht, thereby winding the packaging film F downward spirally around the side surface of the laminated body P of the package. [Selection drawing] Fig. 4

Description

Article 30, Paragraph 2 of the Patent Act applies ・Sales date: July 30, 2021

The present invention relates to a film packaging machine and a film packaging method for packaging an object, such as a cardboard box stacked on a pallet, with a belt-shaped packaging material, such as a film.

When a large number of cargo such as containers, cardboard boxes, or bags containing goods are stacked on pallets and stored in a warehouse, a strip of wrapping film is applied to each of the cargo to prevent the cargo from collapsing or becoming dirty. It is wrapped around luggage and wrapped.

When the work of wrapping each load (item to be wrapped) with a wrapping film is performed manually, the burden on the worker who performs the wrapping work is heavy. In addition, it takes a long time to manually wrap an object. Therefore, a film packaging machine has been proposed that can automate the operation of wrapping a package with a packaging film. A conventional film packaging machine includes a turntable on which a package is placed, a support that extends vertically, and a carriage that is vertically movable along the support.

The carriage is a film supply mechanism that supplies the packaging film. and a guide mechanism for approaching. The packaging film is wound around the side of the package by rotating the turntable on which the package is placed while the guide mechanism brings the packaging film close to the side of the package. ing.

If the length of the package in the vertical direction (the height of the package) is longer than the width of the packaging film, the carriage is moved from bottom to top (or from top to bottom) while the packaging film is applied to the sides of the package. By feeding, the packaging film is helically wrapped around the side of the package for packaging. By winding the packaging film in a spiral shape directed from bottom to top (or from top to bottom), the entire side surface of a vertically long package can be wrapped (eg, Patent Document 1).

JP 2009-126557 A

However, the above conventional method has the following problems. That is, in the case where a stacked body of packaged objects in which a plurality of unaligned packages are stacked in the vertical direction is to be packaged, there is a concern that the stacked body of packaged objects is likely to collapse despite being packaged. . In other words, it may be difficult to fix the package on the topmost layer of the stack of items to be packaged with high precision using the packaging film, and as a result, the package on the topmost layer tends to collapse. be done.

As a specific example of a stack of items to be packaged, a relatively small second package containing articles related to the first package is mounted on a relatively large first package. A configuration in which In this case, since the articles contained in the first package and the articles contained in the second package are related, rather than individually wrapping the first package and the second package, It is desirable to pack the first package and the second package together. In other words, it is desirable to form a laminate of packaged items by mounting a second package on top of a first package, and to wrap the laminate of packaged items with a packaging film. However, when the first package and the second package are packed together by the conventional film packaging machine, the second package, which is stacked on the upper side, is smaller than the first package. It is difficult to sufficiently fix the second load from the side, and there is concern that the second load may collapse and fall.

The present invention has been made in view of such circumstances, and even when packaging a stack of packages in which a plurality of packages are stacked in the vertical direction, each package can be packed without collapsing. It is a main object of the present invention to provide a film packaging machine and a film packaging method capable of packaging all together.

In order to achieve these objects, the present invention has the following configuration.
That is, the film packaging machine according to the present invention includes a turntable on which a stacked article to be packaged in which a plurality of packages are vertically stacked is placed,
a post erected at a position separated from the turntable by a predetermined distance;
A roll holding mechanism that is configured to be movable up and down along the support and rotatably holds an original roll of a belt-shaped packaging film wound in a roll, and a roll holding mechanism that holds the packaging film fed from the original roll. a film supply mechanism having a guide mechanism for approaching the laminated body of packaged objects placed on the turntable;
a control unit that integrally controls operations of the film supply mechanism and the turntable;
with
The control unit
The film supply mechanism is raised while supplying the packaging film to the side surface of the laminated object to be packaged , and the turntable on which the laminated object to be packaged is placed is rotated to thereby remove the packaging film. a first step of winding around the side surface of the stacked object to be packaged so as to form an upward spiral;
By rotating the turntable while the film supply mechanism is raised to a predetermined position higher than the stacked object to be packaged, at least part of the top surface of the stacked object to be packaged is covered with the packaging film. a second step;
By lowering the film supply mechanism from the predetermined position while supplying the packaging film to the side surface of the stacked object to be packaged , and rotating the turntable on which the stacked object to be packaged is mounted, a third step of winding the packaging film around the side surface of the laminated object to be packaged so as to form a downward spiral;
and controlling the operations of the film supply mechanism and the turntable so as to execute in that order,
In the third step, the control unit controls the portion of the packaging film covering the upper surface of the laminate of objects to be packaged to be wound spirally downward on the side surface of the laminate of objects to be packaged. When the packaging film covering the upper surface of the laminated body of packaged goods is pulled downward by the package, a downward force acts on the laminated body of packaged goods to fix each of the packages in the vertical direction. It is characterized by controlling the operation of the film supply mechanism as described above .

(Function and Effect) According to this configuration, the control unit for integrally controlling the turntable on which the object to be packaged is placed and the film supply mechanism for supplying the packaging film to the object to be packaged operates in the first step and the first step. The operations of the film supply mechanism and the turntable are controlled so that the second step and the third step are executed in that order.

In the first step, the turntable on which the object to be packaged is placed is rotated, and the film supply mechanism is raised while supplying the packaging film to the side surface of the object to be packaged, thereby causing the packaging film to spiral upward. Wrap it around the side of the item to be packaged. By raising the film supply mechanism while rotating the turntable, the entire side surface of the object can be wrapped with the packaging film even if the object is tall. Since the upward spirally wound packaging film exerts a force toward the center of the package evenly over the entire laminate, it is possible to suitably prevent the package from collapsing in the horizontal direction.

In the second step, the film supply mechanism is raised to a predetermined position higher than the item to be packaged, and the turntable is rotated to cover at least a portion of the upper surface of the item to be packaged with the packaging film. By performing the second step following the first step, even when the height of the object to be packaged is high, the packaging film wound around the side surface of the object to be packaged in an upward spiral can be continuously wound. can be guided to the upper surface of the item to be packaged. By raising the film supply mechanism and guiding the packaging film to the upper surface of the object to be packaged, the upper surface of the object to be packaged can be wrapped with the packaging film.

In the third step, the film supply mechanism is lowered from a predetermined position to wind the packaging film downward spirally around the side surface of the object to be packaged. By carrying out the third step following the second step, the packaging film wrapped around the upper surface of the article to be packaged is continuously guided to the side surface of the article to be packaged, and the article to be packaged is wound downward in a spiral shape. can be wrapped around the sides of Further, by performing the third step following the second step, the packaging film wrapped around the upper surface of the item to be packaged is pulled downward by the descending film supply mechanism. Therefore, a downward force acts on the item to be packaged from the packaging film wrapped around the upper surface of the item to be packaged. Therefore, even if the object to be packaged is high, the packaging film exerts a fixing force in the vertical direction, so that the collapse of the cargo in the vertical direction can be reliably prevented. In other words, it is possible to suitably prevent both horizontal collapse and vertical collapse of the items to be packaged.

In the above-described invention, the control unit controls the film supply mechanism in the second step so that the packaging film covers the top surface of the package stacked on the topmost layer of the package stack. and preferably to control the operation of the turntable.

(Function and Effect) According to this configuration, the object to be packaged is the object to be packaged, in which a plurality of packages are vertically stacked, and the packaging film is used in the second step. The operation of the film supply mechanism and the turntable is controlled so as to cover the upper surface of the packages stacked on the top layer. By executing the first step, the second step, and the third step in sequence, the side surface of the laminate of items to be packaged is wrapped with the packaging film in an upward spiral and a downward spiral. That is, a plurality of multi-layered packages constituting a stack of items to be packaged are integrally fixed in each of the horizontal direction and the vertical direction. In the above, it is possible to more reliably prevent collapse of cargo due to horizontal or vertical misalignment between the cargo on the lower stage and the cargo on the upper stage.

Further, in the above invention, the control unit is configured to repeat the first step to the third step two or more times, and the upper surface of one end side of the stack of items to be packaged in the horizontal direction is the first step. Covered with the packaging film in the second step so that the top surface of the other end side of the laminate of items to be packaged in the horizontal direction is covered with the packaging film in any of the second and subsequent steps, Preferably, the operation of the film feeding mechanism and the turntable are controlled.

(Function and Effect) According to this configuration, the control section controls the operations of the film supply mechanism and the turntable so that the first to third steps are repeated two or more times. Then, the upper surface of the one end side of the item to be packaged in the horizontal direction is covered with the packaging film in the first second step, and the upper surface of the other end side of the item to be packaged in the horizontal direction is any of the second steps after the second time covered with a packaging film in In this case, a downward force can be applied while covering the upper surface of the item to be packaged with the packaging film on both the one end side of the item to be packaged and the other end side of the item to be packaged. Therefore, it is possible to prevent collapse of the package due to downward force acting only on one end of the package.

Further, by dividing the process of covering the upper surface of the object to be packaged into a plurality of times, the upper surface of the object to be packaged is covered with the packaging film over a wider range, and the upper surface of the object to be packaged is covered in each of the second steps performed multiple times. The length of the packaging film that covers the Therefore, compared to the case where the entire upper surface of the object to be packaged is covered by one second step, the magnitude of the downward force acting on the upper surface of the object to be packaged can be increased per unit area. Therefore, by dividing the process of covering the upper surface of the item to be packaged into a plurality of times, it is possible to more reliably prevent the collapse of the package in the vertical direction.

Further, in the above-described invention, a rotation sensor is provided for detecting the rotation angle of the turntable at any time, the control unit is configured to repeat the first step to the third step two or more times, and the control unit , in the second step after the second time, the packaging film is brought into contact with at least one of the corners of the upper surface of the laminate of objects to be packaged that is not covered by the packaging film; It is preferable to control the ascending speed of the film supply mechanism or the rotation speed of the turntable according to the rotation angle of the turntable detected by the rotation sensor.

(Function and Effect) According to this configuration, the control section controls the ascending speed of the film supply mechanism or the rotation speed of the turntable in accordance with the rotation angle of the turntable detected by the rotation sensor. In this case, the packaging film can be brought into contact with a desired position on the object to be packaged in accordance with the timing when the film supply mechanism rises to a predetermined position higher than the object to be packaged in the second step. In particular, when performing the second step for the second time, the orientation of the object to be wrapped can be adjusted so that the packaging film contacts a portion of the upper surface of the object that has not yet been wrapped with the packaging film. Therefore, it is possible to avoid a decrease in packaging efficiency caused by packaging the packaging film in duplicate at the same position on the upper surface of the object to be packaged.

In order to achieve such an object, the present invention may take the following configuration.
That is, the present invention
A film packaging method for packaging a stacked object to be packaged in which a plurality of packages are vertically stacked using a packaging film supplied from a film supply mechanism configured to be able to move up and down along a support,
While supplying the packaging film to the side surface of the laminated object to be packaged, the film supply mechanism is raised, and the laminated object to be packaged and the film supply mechanism are relatively rotated to obtain the packaging film. a first step of winding the film around the side surface of the laminate of packaged objects so as to form an upward spiral;
By relatively rotating the laminate of objects to be packaged and the film supply mechanism in a state in which the film supply mechanism is raised to a predetermined position higher than the laminate of objects to be packaged, the upper surface of the laminate of objects to be packaged is removed. a second step in which the packaging film covers at least a portion of
By lowering the film supply mechanism from the predetermined position while supplying the packaging film to the side surface of the laminated object to be packaged, and rotating the laminated object to be packaged and the film supply mechanism relative to each other. a third step of winding the packaging film around the side surface of the laminate of packaged objects so as to form a downward spiral;
with
In the third step, the portion of the packaging film covering the upper surface of the laminate of objects to be packaged is pulled downward by the portion of the packaging film wound spirally downward on the side surface of the laminate of objects to be packaged. Thus, a downward force acts on the laminated body of packaged objects from the packaging film in the portion covering the upper surface of the laminated body of packaged objects so that each of the packages is fixed in the vertical direction, Operation of the film feeding mechanism is controlled
It is characterized by

(Function and Effect) According to this configuration, in the case of packaging a laminate of objects to be packaged using the packaging film supplied from the film supply mechanism configured to be able to move up and down along the support, the first step and the The second step and the third step are executed in that order.

In the first step, the laminate of objects to be packaged and the film supply mechanism are rotated relatively, and the film supply mechanism is raised while supplying the packaging film to the side surface of the laminate of objects to be packaged, so that the packaging film is directed upward. spirally around the side surface of the laminated body of packaged items. By raising the film supply mechanism, the entire side surface of the stacked object to be packaged can be wrapped with the packaging film even when the stacked object to be packaged is tall. Since the upward spirally wound packaging film exerts a force in the direction toward the center of the laminated body of packaged objects, it is possible to suitably prevent the luggage from collapsing in the horizontal direction.

In the second step, while the film supply mechanism is raised to a predetermined position higher than the stack of items to be packaged, the stack of items to be packaged and the film supply mechanism are rotated relative to each other so that the upper surface of the stack of items to be packaged is lifted. At least part of it is covered with the packaging film. By performing the second step following the first step, even when the height of the stacked object to be packaged is high, the packaging is wrapped around the side surface of the stacked object to form an upward spiral. The film for packaging can be continuously guided to the upper surface of the laminate of packaged items. By raising the film supply mechanism and guiding the packaging film to the upper surface of the laminate of objects to be packaged, the upper surface of the laminate of objects to be packaged can be wrapped with the packaging film.

In the third step, the film supply mechanism is lowered from a predetermined position to wind the packaging film downward spirally around the side surface of the stack of articles to be packaged. By carrying out the third step following the second step, the packaging film wrapped around the upper surface of the laminate of objects to be packaged is continuously guided to the side surface of the laminate of objects to be packaged, so that it forms a downward spiral. It can be wrapped around the side of the item to be packaged. Further, by performing the third step following the second step, the packaging film wrapped around the upper surface of the stack of articles to be packaged is pulled downward by the descending film supply mechanism. Therefore, a downward force acts on the laminate from the packaging film wrapped around the upper surface of the laminate. Therefore, even if the stack of articles to be packaged is high, the packaging film exerts a fixing force in the vertical direction, so that it is possible to reliably prevent the cargo from collapsing in the vertical direction. That is, it is possible to suitably prevent both horizontal collapse and vertical collapse of the stack of articles to be packaged.

According to the film packaging machine and the film packaging method according to the present invention, the control unit that performs integrated control of the turntable on which the object to be packaged is placed and the film supply mechanism that supplies the packaging film to the object to be packaged includes: The operations of the film supply mechanism and the turntable are controlled so that the first step, the second step and the third step are executed in that order.

In the first step, the turntable on which the object to be packaged is placed is rotated, and the film supply mechanism is raised while supplying the packaging film to the side surface of the object to be packaged, thereby causing the packaging film to spiral upward. Wrap it around the side of the item to be packaged. By raising the film supply mechanism while rotating the turntable, the entire side surface of the object can be wrapped with the packaging film even if the object is tall. Since the upward spirally wound packaging film exerts a force in the direction toward the center of the item to be packaged, it is possible to suitably prevent the collapse of the item in the horizontal direction.

In the second step, the film supply mechanism is raised to a predetermined position higher than the item to be packaged, and the turntable is rotated to cover at least a portion of the upper surface of the item to be packaged with the packaging film. By performing the second step following the first step, even when the height of the object to be packaged is high, the packaging film wound around the side surface of the object to be packaged in an upward spiral can be continuously wound. can be guided to the upper surface of the item to be packaged. By raising the film supply mechanism and guiding the packaging film to the upper surface of the object to be packaged, the upper surface of the object to be packaged can be wrapped with the packaging film.

In the third step, the film supply mechanism is lowered from a predetermined position to wind the packaging film downward spirally around the side surface of the object to be packaged. By carrying out the third step following the second step, the packaging film wrapped around the upper surface of the article to be packaged is continuously guided to the side surface of the article to be packaged, and the article to be packaged is wound downward in a spiral shape. can be wrapped around the sides of Further, by performing the third step following the second step, the packaging film wrapped around the upper surface of the item to be packaged is pulled downward by the descending film supply mechanism. Therefore, a downward force acts on the item to be packaged from the packaging film wrapped around the upper surface of the item to be packaged. Therefore, even if the object to be packaged is high, the packaging film exerts a fixing force in the vertical direction, so that the collapse of the cargo in the vertical direction can be reliably prevented. In other words, it is possible to suitably prevent both horizontal collapse and vertical collapse of the items to be packaged.

1 is a plan view illustrating a schematic configuration of a film packaging machine according to an embodiment; FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a front view explaining schematic structure of the film packaging machine which concerns on an Example. 1 is a perspective view of a laminated body of packaged objects according to an example; FIG. 4 is a flow chart for explaining the operation of the film packaging machine according to the embodiment; It is a top view explaining step S2 and step S3 which concern on an Example. (a) is a diagram showing a state after step S2 is completed and before step S3 is started; (b) is a diagram showing a state in which the turntable is rotated 180° after step S3 is started; ) shows a state in which the turntable has rotated 360° after the start of step S3. It is a front view explaining step S3 which concerns on an Example. It is a front view explaining the state immediately after the start about step S4 which concerns on an Example. It is the perspective view seen from the back direction explaining the state immediately after the start about step S4 which concerns on an Example. It is a front view explaining the state which rotated the turntable 90 degrees and packed about step S4 which concerns on an Example. It is the perspective view seen from the back direction explaining the state which rotated 90 degrees and packed the turntable about step S4 which concerns on an Example. It is a front view explaining step S5 which concerns on an Example. It is the perspective view seen from the back direction explaining step S5 which concerns on an Example. It is a front view explaining step S5 which concerns on an Example. In the example, it is a front view explaining the state where step S3 is being performed for the second time. In the example, it is a perspective view seen from the back for explaining a state in which step S4 is being executed for the second time. It is a longitudinal cross-sectional view explaining step S4 and step S5 which concern on an Example. 10, (b) is a BB cross-sectional view in FIG. 12, and (c) is a CC cross-sectional view in FIG. FIG. 10 is a vertical cross-sectional view for explaining problems associated with a conventional example; (a) is a diagram showing the range to be wrapped when the height of the object to be wrapped is high, (b) is a diagram showing the range to be wrapped when the object mounted on the top is small, (c ) is a diagram showing the range to be wrapped when the film is spirally wound while the carriage is moved in one direction. FIG. 4 is a perspective view showing a trajectory along which the packaging film is wound in steps S3 to S5; (a) is a diagram showing a trajectory according to an example, (b) is a diagram showing a trajectory according to a modification in which the packaging film is wrapped around the four sides of the upper surface of the second package, and (c) is a diagram showing the trajectory. FIG. 10 is a diagram showing a trajectory according to a modified example of wrapping the packaging film so as to cross one of the corners of the second packaged object;

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of the film packaging machine 1 according to the embodiment, and FIG. 2 is a front view of the film packaging machine 1 according to the embodiment. In the following figures, the horizontal direction of the film packaging machine 1 is defined as the x direction. Further, the front-rear direction of the film packaging machine 1 is defined as the y-direction, and the up-down direction (vertical direction) of the film packaging machine 1 is defined as the z-direction. Further, in each figure, the direction of the film packaging machine 1 when viewed from the front is indicated by a symbol Wa.

A film packaging machine 1 according to the present invention includes a base portion 3 , a turntable 5 , a post 7 and a carriage 9 . The turntable 5 is arranged on one end side of the base portion 3 , and the post 7 is erected on the other end side of the base portion 3 . That is, the post 7 is erected at a position separated from the turntable 5 by a predetermined distance. A driving device 21 and an operating device 23 are arranged on the other end side of the base portion 3 .

The turntable 5 is for placing a laminated body of packaged objects P to be packaged by the film packaging machine 1, and is configured to be rotatable about an axis in the z direction. In this embodiment, the direction of rotation of the turntable 5 is indicated using reference symbol R1 in FIG. 1 and the like. A mounting table 11 and a chucking device 13 are arranged on the turntable 5 .

The carriage 9 supplies the packaging film F, and is configured to move up and down along the struts 7 . The carriage 9 includes a roll holding mechanism 15 , a stretching mechanism 17 and guide rollers 19 . 1 and 5, the carriage 9 is shown in cross section. The carriage 9 corresponds to the film supply mechanism in the invention.

A mounting table 11 is arranged on the upper surface of the turntable 5 , and the laminated body P of the package to be packaged is mounted on the mounting table 11 . In this embodiment, as an example, the stacked object to be packaged P mounted on a flat pallet 14 having approximately the same size as the stacked object to be packaged P is carried in from the direction indicated by the reference character J in FIG. Place it on top. The mounting table 11 is configured to be smaller than each of the turntable 5 and the laminated body P of packaged items in a plan view. Therefore, a gap 12 is formed in a portion corresponding to the side surface of the mounting table 11 between the laminate P and the turntable 5 . That is, by inserting a fork of a forklift or the like into the gap 12 , the stacked body P of packaged objects wrapped with the packaging film F can be carried out together with the pallet 14 .

The chucking device 13 is arranged between the mounting table 11 and the carriage 9 in the initial state. The chucking device 13 is configured to be movable forward and backward with respect to the package stack P placed on the turntable 5 . When the chucking device 13 moves closer to the laminated body P while the packaging film F is guided to the side surface of the laminated body P, the chucking device 13 clamps the packaging film F to the side of the laminated body P. The downstream end portion of the packaging film F is fixed to the side surface of the laminated body P to be packaged. The chucking device 13 corresponds to the film fixing mechanism of the invention.

The chucking device 13 has a cutter guide plate 18 and a cutter 20 . The cutter guide plate 18 is arranged to extend in the z direction. The cutter 20 is configured to be reciprocally movable in the z-direction along the cutter guide plate 18, and cuts the packaging film F in the width direction by moving in the z-direction.

The roll holding mechanism 15 has a supply bobbin. The supply bobbin is configured so that a raw roll around which the packaging film F is wound can be loaded. The packaging film F is unwound from a supply bobbin arranged in the roll holding mechanism 15 . The direction in which the packaging film F is paid out is indicated by Ta in each figure. The supply bobbin provided in the roll holding mechanism 15 is interlocked with an electromagnetic brake (not shown) to apply an appropriate rotational resistance. Therefore, excessive feeding of the packaging film F from the supply bobbin is prevented.

The stretching mechanism 17 stretches the packaging film F in the delivery direction Ta and the width direction, and includes, for example, a pair of adjacent stretching rollers 17a and 17b. Each of the drawing rollers 17a and 17b has an uneven surface and each axis extends in the z-direction. The stretching mechanism 17 is configured such that the projections and depressions of the stretching rollers 17a and 17b enter into each other. The packaging film F is preferably made of a film-like material that stretches in both the delivery direction Ta and the width direction, and a preferred material for the packaging film F is polyethylene film.

An electric motor (not shown) is interlocked with the upper end of the stretching roller 17b positioned on the downstream side in the delivery direction Ta of the packaging film F. As shown in FIG. Further, the lower ends of the drawing rollers 17a and 17b are interlocked with each other through a chain type reduction mechanism (not shown) at a predetermined reduction ratio so that the upstream rotation of the packaging film F in the supply direction is slowed down. With such a configuration, as the packaging film F fed out from the roll holding mechanism 15 is passed between the stretching rollers 17a and 17b, the packaging film F is stretched in the width direction and stretched by the stretching roller 17b. It is configured to be stretched by being pulled in the feed-out direction Ta.

The guide roller 19 is arranged outside the housing portion 9 a of the carriage 9 . Further, the guide roller 19 is arranged so that the axis of the guide roller 19 extends in the z direction. The housing portion 9a of the carriage 9 is provided with an opening K, and the packaging film F stretched by the stretching mechanism 17 is guided to the outside of the housing of the carriage 9 via the opening K, and guided. It is wound around the roller 19 .

The unwinding direction Ta of the packaging film F is adjusted so that the packaging film F wound around the guide roller 19 is guided to the laminated body P placed on the turntable 5 . By being wound around the guide roller 19, the packaging film F is given tension in the feed-out direction Ta, and is adjusted so as not to generate wrinkles. The guide roller 19 corresponds to the film guide mechanism in the invention.

The driving device 21 accommodates a table rotating motor and a carriage lifting motor. By driving the table rotation motor, the turntable 5 rotates around the axis in the z direction. Further, the carriage 9 moves up and down along the column 7 by driving the carriage lifting motor. The driving device 21 also includes a driving motor (not shown) for moving the chucking device 13 forward and backward.

The operation device 23 includes an operation panel 23a for inputting an operator's instruction regarding the operation of the film packaging machine 1 . The operation device 23 also includes information processing means such as a central processing unit (CPU), and houses a control unit, which is a processor that executes various types of arithmetic processing. The control unit integrally controls various components of the film packaging machine 1, such as the turntable 5 and the carriage 9. FIG.

<Structure of Laminated Object to be Packaged>
FIG. 3 shows the configuration of a laminate P to be packaged by the film packaging machine 1 in this embodiment. The package P has a configuration in which a plurality of packages are stacked one above the other. Specifically, the second package item Lb is mounted on the upper surface of the first package item La, and the configuration as a whole corresponds to a two-stage laminate.

The first package La is larger than the second package Lb, and an example thereof is a container or a cardboard box. In this embodiment, the first package La is assumed to be a container. The container contains the main and large items.

The second package item Lb is smaller than the first package item La, and examples thereof include a cardboard box or a storage bag. In this embodiment, as shown in FIG. 3, the second package Lb is assumed to be four corrugated cardboard boxes arranged in front, back, left, and right. The four cardboard boxes that constitute the second package Lb are distinguished from each other as cardboard boxes Lb1 to Lb4. Cardboard boxes Lb1 to Lb4 contain small-sized items that could not be contained in the first package La. Each of the first package item La and the second package item Lb corresponds to a package in the present invention.

In addition, FIG. 3 shows the position of the package P in the initial state. That is, in the initial state, the cardboard box Lb1 is positioned on the left front side of the second package Lb, and the cardboard box Lb2 is positioned on the right front side of the second package Lb. The cardboard box Lb3 is positioned on the left rear side of the second package Lb, and the cardboard box Lb4 is positioned on the right rear side of the second package Lb.

<Outline of operation>
Here, the operation of the film packaging machine 1 according to the embodiment will be described. FIG. 4 is a flow chart for explaining a series of processes for packaging a laminated body of packaged objects P, which is an object to be packaged, with a packaging film F using the film packaging machine 1 .

Step S1 (carrying in the packaging object)
First, using a forklift or the like, the laminated body P of the objects to be packaged mounted on the pallet 14 is carried into the film packaging machine 1 . The direction in which the laminated body P to be packaged is carried into the film packaging machine 1 is indicated by J in FIG. By placing the pallet 14 on the mounting table 11 together with the laminated body P to be packaged, the laminated body P to be packaged is carried into the film packaging machine 1 . When the laminated body P of the objects to be packaged is brought in, the carriage lifting motor of the driving device 21 is operated to move the carriage 9 to the initial position Hs. The carriage 9 positioned at the initial position Hs is indicated by solid lines in FIG. Further, the height of the initial position Hs of the carriage 9 corresponds to the height of the lower part of the first package La which is stacked in the lowest stage of the package P. As shown in FIG.

Step S2 (guide of film)
When the laminated body P of the objects to be packaged is carried into the film packaging machine 1, the packaging film F is guided to the laminated body P of the objects to be packaged. After being unwound from the roll holding mechanism 15 , the packaging film F is stretched in both the width direction and the unwinding direction by the stretching mechanism 17 and wound around the guide roller 19 via the opening K of the carriage 9 .

The packaging film F wound around the guide rollers 19 in a stretched state is fed out in the feeding direction Ta and guided toward the side surface of the laminated body P of the objects to be packaged, as shown in FIG. 5(a). The downstream end of the packaging film F is guided between the side surface of the laminate P and the chucking mechanism 13 . In this embodiment, the packaging film F is guided to the side lower part of the first package La in the package P of the package P. As shown in FIG.

When the packaging film F is guided to the side surface of the laminated body P of the objects to be packaged, the chucking mechanism 13 starts moving closer to the laminated body P of the objects to be packaged as shown in FIG. 5(a). As the chucking mechanism 13 moves closer, the chucking mechanism 13 comes into contact with the side surface of the laminated body P with the packaging film F interposed therebetween. The packaging film F is fixed to the side surface of the laminated body P by the chucking mechanism 13 by contacting the chucking mechanism 13 .

Step S3 (upward winding process)
When the packaging film F is fixed to the side surface of the laminate P of objects to be packaged using the chucking mechanism 13, the turntable 5 and the carriage 9 are operated to perform the operation of winding the packaging film F around the laminate P of objects to be packaged. Start. That is, the turntable 5 is rotated in the rotation direction R1 while newly feeding the packaging film F from the carriage 9 . Then, the upward movement of the carriage 9 is started in synchronization with the rotation of the turntable 5 .

5(b) and 5(c) show plan views of the film packaging machine 1 in step S3. By rotating the laminate P of objects to be packaged together with the turntable 5 in the rotation direction R1, as shown in FIGS. The packaging film F is wound around the side surface of the laminated body P of the objects to be packaged by feeding. After rotating the stacked object P to be packaged more than a certain amount, the chucking mechanism 13 is moved backward to separate from the stacked object P to be packaged as shown in FIG. 5(c). By separating the chucking mechanism 13 from the laminated body P of the package, the fixing of the packaging film F by the chucking mechanism 13 is released.

FIG. 6 shows a front view of the film packaging machine 1 in step S3. For convenience of explanation, the chucking mechanism 13 is omitted from FIG. 6 and subsequent drawings. In step S3, the turntable 5 is rotated in the rotation direction R1, and the carriage 9 is lifted along the post 7 while feeding the packaging film F from the carriage 9. As shown in FIG. By unwinding the packaging film F while raising the carriage 9, the packaging film F is guided to the side surface of the laminate P of packaged objects via the guide rolls 19, as shown in FIG. It is obliquely upward from the product stack P toward the carriage 9 .

Therefore, while raising the carriage 9 from the initial position Hs, the packaging film F is drawn out and supplied to the side surface of the rotating laminated body P, so that the packaging film F spirals upward. It is wound around the side surface of the laminated body P of the package. Specifically, the packaging film F is wound around the side surface of the first item to be wrapped La so as to form an upward spiral starting from the lower portion of the side surface of the first item to be packaged La. The direction in which the packaging film F is spirally wound upward is indicated by D1. The process of step S3, that is, the process of winding the packaging film F upward spirally around the side surface of the laminated body P of the objects to be packaged corresponds to the first step in the present invention.

Step S4 (top packaging process)
Following the process of step S3 in which the packaging film F is wrapped around the side surface of the laminate P to form an upward spiral for packaging, the upper surface of the laminate P is wrapped with the packaging film F. carry out the process. That is, while the turntable 5 continues to rotate, the carriage 9 is further raised while feeding out the packaging film F, and moved to a predetermined position indicated by symbol Ht in FIG. The predetermined position Ht is a position higher than the height of the stacked body P of the objects to be packaged. Further, when the packaging film F is supplied while the carriage 9 is moved to the predetermined position Ht, the predetermined position Ht is set so that at least a part of the packaging film F is supplied to the upper surface of the laminated body P of the objects to be packaged. is predetermined.

When the carriage 9 rises to the predetermined position Ht, the vertical movement of the carriage 9 is interrupted. Then, while continuing to rotate the turntable 5, the packaging film F is delivered from the carriage 9 positioned at the predetermined position Ht. By continuing to supply the packaging film F from the predetermined position Ht, one end side (upper end side in FIG. 7) of the packaging film F in the width direction wraps the upper surface of the laminate P of the objects to be packaged. In the case of this embodiment, as shown in FIGS. 7 and 8, the packaging film F contacts the corner Kd1 of the second packaged item Lb, and the packaging film F starts from the corner Kd1 and its neighboring area. covers the top and side surfaces of the second package Lb.

7 and 8, the carriage 9 rises to the predetermined position Ht at the timing when the cardboard boxes Lb1 and Lb2 of the second package Lb are positioned in front of the stack of packages P, and step S4 is completed. The case where it is started is exemplified. In this case, the packaging film F contacts the corner of the corrugated cardboard box Lb4 located on the right rear side of the stack of items to be packaged P, and the top surface of the second item to be packaged Lb starts from the top surface of the cardboard box Lb4. The packaging of the packaging film F for is started.

After the packaging film F contacts the corner Kd1 of the second package item Lb, the turntable 5 is rotated while the carriage 9 is positioned at the predetermined position Ht, and the second package item is removed from the carriage 9. The packaging film F is supplied to Lb. 9 and 10 show the state in which the turntable 5 is rotated 90° from the state shown in FIGS. 7 and 8. FIG. In step S4, the packaging film F is fed out while the height of the carriage 9 is maintained. Therefore, as shown in FIGS. It is wound approximately horizontally. The substantially horizontal direction in which the packaging film F is wound in step S4 is indicated by D2 in FIG. 9 and the like.

By feeding out and supplying the packaging film F while rotating the turntable 5 by 90°, the packaging film F extends from the corner Kd1 of the second package Lb to the corner Kd2 adjacent to the corner Kd1. is wrapped around the top and side surfaces of the package Lb. In this embodiment, the packaging film F is wrapped around the upper and side surfaces of the second package Lb from the corner Kd1 of the cardboard box Lb4 to the corner Kd2 of the cardboard box Lb2. . In other words, the upper surface of the one end side G1 of the second package Lb in the horizontal direction is wrapped with the packaging film F. As shown in FIG.

FIG. 16(a) shows the AA section of FIG. At one end side G1 of the second item to be packaged Lb in the horizontal direction, the upper surface and side surfaces of the second item to be packaged Lb are wrapped by one end side of the packaging film F in the width direction. In step S4 in this embodiment, one end of the packaging film F in the width direction is wrapped around the top and side surfaces of the second package Lb, and the other end of the packaging film F in the width direction is wrapped around the first end. It is wrapped around the side surface of the item to be packaged La.

By simultaneously winding the packaging film F around the first item La and the second item Lb, the first item La and the second item Lb are fixed. It is possible to prevent the position of the second package item Lb from shifting in the horizontal direction with respect to the first package item La. With the carriage 9 raised to the predetermined position Ht, the turntable 5 is rotated by a predetermined rotation angle, and the upper surface of the second package Lb is wrapped in a predetermined area, thereby completing the step S4. terminate. In this embodiment, the carriage 9 is rotated 90° in the rotational direction R1 in a state where it is lifted to the predetermined position Ht, and the upper surface of the second package Lb is wrapped along one side from the corner Kd1 to the adjacent corner Kd2. By doing so, step S4 is terminated and the process proceeds to step S5. The process of step S4, that is, the process of winding the packaging film F around the upper surface of the laminate P of the objects to be packaged corresponds to the second step in the present invention.

Step S5 (downward winding process)
When a predetermined area of the upper surface of the second package Lb is wrapped, step S5 is started. That is, the rotation of the turntable 5 is continued, and the packaging film F is fed out while the carriage 9 is lowered from the predetermined position Ht. By lowering the carriage 9 and letting out the packaging film F, the packaging film F is guided to the side surface of the laminated body P of the objects to be packaged via the guide rolls 19, as shown in FIG. It is obliquely downward from the product stack P toward the carriage 9 .

Therefore, while the carriage 9 is lowered from the predetermined position Ht, the packaging film F is drawn out and supplied to the side surface of the rotating laminated body P of packaged objects, as shown in FIGS. 11 and 12. F is wound around the side surface of the laminated body P of packaged items so as to form a downward spiral. Specifically, the packaging film F is wound around the side surface of the first package La so as to form a downward spiral starting from the corner Kd2 of the second package Lb. The direction in which the packaging film F is wound in a downward spiral is indicated by D3.

FIG. 16(b) shows the BB cross section of the package stack P in FIG. In step S4, the packaging film F is wound in the direction D2, which is substantially horizontal with respect to the upper surface of the second package Lb. By being wound, a downward force Md acts on the second package Lb from the packaging film F wrapping the upper surface of the second package Lb. Since the second package Lb is fixed in the vertical direction by the downward force Md, it is possible to reliably avoid the situation in which the second package Lb collapses in the vertical direction.

Further, the turntable 5 continues to rotate, and the carriage 9 is lowered from the predetermined position Ht to the initial position Hs while wrapping the packaging film F around the side surface of the laminated product P in the downward spiral direction D3. FIG. 13 shows a state in which the carriage 9 has returned from the predetermined position Ht to the initial position Hs. By supplying the packaging film F while lowering the carriage 9 toward the side surface of the rotating laminate P, the packaging film F moves downward along the spiral direction D3 along the first package La. wrapped around the sides of the

In FIG. 13, of the packaging film F, the packaging film F wound in the upward spiral direction D1 in step S3 is denoted by reference numeral F1. The packaging film F wound in the substantially horizontal direction D2 in step S4 is denoted by F1, and the packaging film F wound in the downward spiral direction D3 in step S5 is denoted by F3. to distinguish between them.

That is, in step S5, as shown in FIG. 13, the packaging film F3 is wound so as to further cover the packaging film F1 that covers the side surface of the laminated body P of packaged items. The process of step S5 is completed when the carriage 9 returns to the initial position Hs while the packaging film F is wound downward spirally around the side surface of the laminated body P of the package. The process of step S5, that is, the process of winding the packaging film F downward spirally around the side surface of the laminated body P of the package P corresponds to the third step in the present invention.

The packaging film F is wound around the laminated body P of the objects to be packaged in a woven pattern as a whole by the processes from step S3 to step S5. That is, in step S3, the packaging film F is spirally wound upward on the side surface of the laminate P of the objects to be packaged, and in step S4, the packaging film F is substantially horizontally wrapped around at least a part of the upper surface of the laminate P of the objects to be packaged. , and in step S5, the packaging film F is wound downward spirally around the side surface of the laminated body P of the objects to be packaged.

After that, the process branches depending on whether or not the packaging of the laminated body P of the objects to be packaged has been completed. In this embodiment, it is determined that the packaging of the laminated body P is completed when one end and the other end of the upper surface of the laminated body P are wrapped with the packaging film F. In the state where step S4 has been executed once, as shown in FIG. 2, the packaging film F is not wound on the other end side G2 of the item to be packaged Lb. Therefore, it is determined that the packaging of the laminated body P of objects to be packaged is not completed here, and the processes from step S3 to step S5 are executed again.

When the second step S3 is started, the carriage 9 moves up again from the initial position Hs to the predetermined position Ht as shown in FIG. Feed out F. The carriage 9 feeds out the packaging film F while ascending along the pillars 7, so the fed-out packaging film F spirals upward so as to cover the packaging film F3 wound in a downward spiral in the first step S5. wrapped in a shape. The packaging film F wound around the laminated body of packaged objects P in the second step S3 is indicated by reference numeral F4 in FIG.

When the carriage 9 rises again to the predetermined position Ht, the second step S4 is started. FIG. 15 shows the state in which step S4 is executed for the second time. In this embodiment, in the first step S4, the packaging film F is wound from the corner Kd1 to the adjacent corner Kd2 of the second package Lb. Therefore, in this embodiment, in the second step S4, the packaging film F is wound from the corner Kd3 to the corner Kd4 of the second package Lb. The corner Kd3 is located opposite the corner Kd1 across the center of the upper surface of the second package Lb. The corner Kd4 is a corner facing the corner Kd2 across the center of the upper surface of the second package Lb.

In performing step S4 for the second time, the ascending speed of the carriage 9 or the rotational speed of the turntable 5 is adjusted so that the wrapping film F contacts the corner Kd3 that has not yet been wrapped with the wrapping film F. As an example, a rotation sensor for detecting the rotation angle of the turntable 5 at any time is arranged in the film packaging machine 1, and the ascending speed of the carriage 9 or the rotation speed of the turntable 5 is controlled according to the rotation angle of the turntable 5. Thus, the packaging film F can be brought into contact with the corner Kd3 when the carriage 9 rises again to the predetermined position Ht.

While the packaging film F is in contact with the corner Kd3 of the second package Lb, the turntable 5 continues to rotate, and the packaging film is removed from the carriage 9, which has stopped moving up and down at a predetermined position Ht. F is fed out. While rotating the turntable 5 by 90°, the packaging film F is continuously fed from the predetermined position Ht, so that the upper surface and side surfaces of the second package Lb are wrapped along one side from the corner Kd3 to the corner Kd4. It is covered with one end side of the film F in the width direction. In other words, the packaging film F wraps the top and side surfaces of the other end G2 of the second package Lb in the horizontal direction. At this time, the other end of the packaging film F in the width direction covers the upper side surface of the first package La.

When the packaging film F is wrapped around the upper surface of the other end G2 of the second package Lb, the process proceeds from step S4 to step S5. That is, the turntable 5 continues to rotate, and the carriage 9 is lowered from the predetermined position Ht to the initial position Hs while the packaging film F is fed out. The packaging film F unwound from the descending carriage 9 is wound around the side surface of the laminated body P in a downward spiral starting from the corner Kd4. The second step S5 is completed when the carriage 9 returns to the initial position Hs.

FIG. 16(c) shows a CC section of FIG. One end side G1 of the second item to be packaged Lb is covered with the packaging film F in the first step S4, and the other end side G2 of the second item to be packaged Lb is covered with the packaging film F in the second step S4. covered. In step S5, the packaging film F is wound downward spirally starting from the corner Kd4, so that the part of the packaging film F wound on the upper surface of the second package Lb is wound downward spirally. It is pulled downward by the packaging film F. Especially around the corner Kd4, it is pulled downward relatively strongly.

Therefore, not only the one end side G1 of the second package Lb but also the other end side G2 of the second package Lb from the packaging film F packaging the upper surface of the second package Lb to the second package Lb. A downward force Md acts. The downward force Md fixes the second package Lb in the vertical direction. Therefore, it is possible to reliably avoid the situation where the second package Lb collapses in the vertical direction at the other end side G2 of the second package Lb. In addition, by generating the downward force Md in good balance on both the one end side G1 and the other end side G2 of the second package Lb, the downward force Md acts unevenly on the upper surface of the second package Lb. It is possible to avoid the collapse of the second package Lb due to this.

Also, in step S4 of the first time, the packaging film F is wound around the side surface of the one end side G1 of the second item to be packaged Lb and the side surface of the one end side G1 of the first item to be packaged La, starting from the one end side G1. A horizontal force Mk1 directed toward the center of the product stack P is generated. Then, in the second step S4, the packaging film F is wound around the side surface of the other end side G2 of the second item to be packaged Lb and the side surface of the other end side G2 of the first item to be packaged La, and from the other end side G2 A horizontal force Mk2 directed toward the center of the package P is generated. By performing steps S3 to S5 twice to generate both horizontal forces Mk1 and Mk2, the position of the stack of packaged items P in the horizontal direction can be fixed. As an example, it is possible to prevent the position of the second packaged item Lb from shifting toward the other end side G2 due to the application of only the horizontal force Mk1.

By the completion of the second step S5, the packaging material is placed on the upper surface of the second package Lb stacked on the topmost level for the one end side G1 and the other end side G2 of the package stack P in the horizontal direction. A film F is wound. Since the downward force Md and the horizontal forces Mk1 and Mk2 act on the laminate P, the first package La and the second package Lb constituting the laminate P are is stably fixed. Therefore, it is determined that the packaging of the laminated body P to be packaged has been completed, and the process proceeds from step S5 to step S6.

Step S6 (carrying out packaging object)
Steps S3 to S5 are repeated a predetermined number of times, and when the packaging of the stacked object P is completed, the step of unloading the stacked object P to be packaged is started. First, the cutter 20 provided in the chucking device 13 is moved in the z-direction along the cutter guide plate 18 to cut the packaging film F fed out from the carriage 9 in the width direction. Then, the fork portion of the forklift is inserted into the gap portion 12 and the lower surface of the pallet 14 is supported to hold the stack of articles P to be packaged. Then, by moving the forklift truck in the direction opposite to the carry-in direction J, the stack of packaged objects P wrapped with the packaging film F is carried out together with the pallet 14 . A series of processes is completed by unloading the laminated body P of the packaged object wrapped with the packaging film F.

<Effects of Configuration of Example>
In the film packaging machine 1 according to the embodiment, the packaging film F is wrapped around the laminated body P of the packaged objects in the configuration in which the laminated body P of the packaged objects to be packaged is rotated and the packaging film F fed out from the carriage 9 is wrapped around the laminated body P. While being extended, the carriage 9 is reciprocated between the initial position Hs and the predetermined position Ht. That is, by continuously executing steps S3 to S5, the packaging film F as a whole is wound in a crimped manner to package the laminate P of items to be packaged.

The initial position Hs is a position corresponding to the side of the first package La that is stacked on the bottom of the stack P of packaged items, and the predetermined position Ht is the top of the stack of packaged items P. This position is higher than the stacked second package Lb. In step S3, the carriage 9 is lifted from the initial position Hs to the predetermined position Ht, and the packaging film F is supplied to the laminated body P of the objects to be packaged. The packaging film F can be spirally wound upward on the side surface of the laminated body P of the objects to be packaged. In other words, even when the laminate P of objects to be packaged is tall, the side surfaces of the laminate P of objects to be packaged can be wrapped from the lower portion to the upper portion with the packaging film. Therefore, it is possible to stably fix the stacked body of packaged items P in the horizontal direction.

In step S4, the carriage 9 is lifted to a predetermined position Ht higher than the stack of items to be packaged P, and the stack of items to be packaged is removed from the carriage 9 while rotating the turntable 5 on which the stack of items to be packaged P is mounted. Supply the packaging film F to P. By performing step S4 following step S3, the packaging film F (packaging film F1) wound around the side surface of the laminated body of packaged objects P in an upward spiral shape is continuously stacked. It can be guided to the upper surface of the body P, and the upper surface of the laminated body P of the items to be packaged can be covered with the packaging film F.

In step S5, the carriage 9 is lowered from the predetermined position Ht to the initial position Hs, and the packaging film F is supplied to the laminated body P to be packaged so that the packaging film F faces downward on the side surface of the laminated body P. Wrap in a spiral. By carrying out Step S5 following Step S4, the packaging film F (packaging film F2) wound on the upper surface of the laminate P of packaged items is replaced with the packaging film F (packaging film F2) wound downward spirally. It is pulled downwards by the film F3).

Therefore, as shown in FIG. 16(b), a downward force Md acts on the laminate P from the packaging film F wrapping the upper surface of the laminate P. As shown in FIG. The downward force Md fixes the stacked body of packaged objects P in the vertical direction, so that the situation in which the stacked body of packaged objects P collapses in the vertical direction can be reliably avoided. That is, the carriage 9 for supplying the packaging film F is vertically reciprocated from the initial position Hs via the predetermined position Ht and then returned to the initial position Hs, thereby stabilizing both the horizontal direction and the vertical direction. It is possible to wrap the laminated body P of the package to be wrapped with the wrapping film F so that it can be fixed by

Further, in this embodiment, in step S4, the packaging film F is wound substantially horizontally not only on the upper surface of the second item to be packaged Lb but also on the side surface of the second item to be packaged Lb. Therefore, as shown in FIG. 16(b), the horizontal force Ms is applied to the second package Lb from the packaging film F wrapping the side surface of the second package Lb. It acts toward the center of the object Lb. The second package Lb is also fixed in the horizontal direction by the inward force Ms in the horizontal direction. Therefore, it is possible to reliably avoid the situation in which the second package Lb collapses in the horizontal direction.

In step S4, one widthwise end of the packaging film F is wrapped around the second package Lb, and the other widthwise end of the packaging film F is wrapped around the first package Lb. Therefore, the horizontal force Ms acts on the second package Lb, and the horizontal force Mp acts toward the center of the first package La. That is, since the force Mp in the horizontal direction acts, it is possible to avoid the situation in which the first package La is collapsed in the horizontal direction. In step S4, since the first package La and the second package Lb are packaged integrally with the strip-shaped packaging film F, the first package La is wrapped by the second package. It is possible to reliably avoid a situation in which the packaged item Lb is displaced in the horizontal direction.

In a conventional film packaging machine, a carriage that supplies a film is moved upward in one direction to wrap the film spirally around the side surface of the object to be packaged. However, in such a conventional configuration, when the packaging object Q of the film Fm has a configuration in which a plurality of objects Q1 and Q2 are vertically stacked as shown in each figure of FIG. It is difficult to fix to

As an example, when the object Q to be wrapped is tall, the film Fm does not reach the object Q2 stacked thereon as shown in FIG. 17(a), and the object Q2 cannot be stably fixed. In addition, when the object Q2 stacked in the upper part is smaller than the object Q1 stacked in the lower part, as shown in FIG. There is concern that it will not reach

Even when the film Fm reaches the object Q2, the carriage is moved in one direction to spirally wind the film Fm, as shown in FIG. 17(c). It remains to wrap with. At least, since the film Fm cannot exert a downward force on the object Q to be wrapped, the film Fm can fix the object Q horizontally, but it is not possible to fix it vertically. Can not. Therefore, it is difficult to reliably prevent collapse of the package Q.

In contrast to such a conventional configuration, in the film packaging machine 1 according to the present invention, the packaging film F is vertically reciprocated between the initial position Hs and the predetermined position Ht higher than the laminated body P of the package. Since it is wound, the packaging film F can be wound around the upper surface of the laminated body P of the objects to be packaged, and a downward force can be applied from the packaging film F to the upper surface of the laminated body P of the objects to be packaged. Therefore, the stacked body P of the objects to be packaged can be stably fixed in the vertical direction, so that the stacked body P of the objects to be packaged can be prevented from collapsing more reliably.

<Other embodiments>
It should be noted that the embodiments disclosed this time are illustrative in all respects and are not restrictive. The scope of the present invention is indicated by the scope of the claims rather than the description of the above-described embodiments, and includes all modifications (modifications) within the meaning and scope equivalent to the scope of the claims. As an example, the present invention can be modified and implemented as follows.

(1) In the embodiment, as shown in FIG. 18(a), in step S3, the packaging film F is wound upward spirally along the path N1, and then in step S4, the turntable 5 is rotated 90°, and the second The packaging film F is wound over one side from the corner Kd1 to the adjacent corner Kd2 of the item to be packaged Lb (see locus N2). Then, in step S5, the packaging film F is wound downward spirally (see locus N3). Here, the range to be wrapped with the packaging film F in step S4 according to the embodiment is not limited to one side of the second package Lb.

As an example, as shown in FIG. 18(b), after wrapping the packaging film F in an upward spiral in step S3, the turntable 5 is rotated 360°, and the corner Kd1 of the second package Lb is rotated from the corner Kd1 to the corner Kd1. The packaging film F is wound so as to go around the four sides of the second package Lb via Kd2, Kd3, and Kd4 (see locus N4), and in step S5, the corner Kd1 is the starting point and spirals downward. A configuration in which the packaging film F is wound is exemplified. In this case, by performing step S4 once, the packaging film F can be wrapped around the entire circumference of the upper and side surfaces of the second package Lb. The first package La and the second package Lb can be stably packaged. Therefore, the time required for packaging the laminate P of objects to be packaged can be shortened.

As another example, as shown in FIG. 18(c), in step S3, after wrapping the packaging film F in an upward spiral along the locus N1, the corner Kd1 of the second package Lb is traversed. As above, the packaging film F is wound on the upper surface of the second package Lb (see locus N5), and in step S5, the packaging film F is spirally wound downward along the locus N3. In this case, the packaging film F is wound around the corner Kd1 of the upper surface of the second package Lb. That is, since the range in which the packaging film F is wound in one step S4 can be made relatively narrow, by winding the packaging film F in a downward spiral in step S5, the packaging film F can be wound in a second direction. It is possible to improve the magnitude of the downward force Md acting from the packaging film F per unit area of the upper surface of the item to be packaged Lb. Therefore, it is possible to further stabilize the stacked body P of items to be packaged in the vertical direction.

(2) At step S4 according to the embodiment, as shown in FIG. The other end of the packaging film F is wound around the upper side surface of the first package La. However, step S4 is not limited to winding the packaging film F around the upper side surface of the first package item La and the upper surface of the second package item Lb at the same time. As an example, first, the turntable 5 is rotated once while wrapping the packaging film F around the upper side surface of the first package item La and the side surface of the second package item Lb. 2 may be wrapped around the side surface and upper surface of the package Lb.

(3) The configuration of the film packaging machine 1 according to the embodiment is not limited to the configuration including the chucking mechanism 13 . That is, instead of using the chucking mechanism 13 to automatically fix the end portion of the packaging film F to the side surface of the laminate P, the operator manually clamps the end portion of the packaging film F in step S2. The side surface of the laminate P of packages may be lashed.

(4) In the embodiment, the steps S3 to S5 are repeated twice, but the number of times the steps S3 to S5 are performed is not limited to this, and may be performed once, three times or more. It may be configured to perform.

(5) In the embodiment, the turntable 5 is rotated to rotate the laminated body P to be packaged. is not limited to As an example, while rotating the post 7 together with the carriage 9 along a circumferential trajectory centered on the stack of items to be packaged P, the carriage 9 is moved between the height of the initial position Hs and the height of the predetermined position Ht in the z direction. may be moved back and forth to

(6) In the embodiments, a structure in which the first packaged item La and the second packaged item Lb are laminated as the laminated body P of the packaged item was exemplified. It is not limited to a structure laminated in two stages. The package P may be a structure consisting of one package, or may be a structure in which three or more packages are stacked one above the other.

DESCRIPTION OF SYMBOLS 1... Film packaging machine 3... Base part 5... Turntable 7... Support column 9... Carriage (film supply mechanism)
REFERENCE SIGNS LIST 11: Mounting table 13: Chucking device (film fixing mechanism)
DESCRIPTION OF SYMBOLS 15... Roll holding mechanism 17... Stretching mechanism 19... Guide roller (guide mechanism)
DESCRIPTION OF SYMBOLS 21... Driving device 23... Operating device P... Laminated object to be packaged La... First object to be packaged (luggage)
Lb … Second packaged item (package stacked on top)
Ta … Feeding direction

Claims (5)

a turntable on which a stacked body of packaged items in which a plurality of packages are vertically stacked is placed;
a post erected at a position separated from the turntable by a predetermined distance;
A roll holding mechanism that is configured to be movable up and down along the support and rotatably holds an original roll of a belt-shaped packaging film wound in a roll, and a roll holding mechanism that holds the packaging film fed from the original roll. a film supply mechanism having a guide mechanism for approaching the laminated body of packaged objects placed on the turntable;
a control unit that integrally controls operations of the film supply mechanism and the turntable;
with
The control unit
The film supply mechanism is raised while supplying the packaging film to the side surface of the laminated object to be packaged , and the turntable on which the laminated object to be packaged is placed is rotated to thereby remove the packaging film. a first step of winding around the side surface of the stacked object to be packaged so as to form an upward spiral;
By rotating the turntable while the film supply mechanism is raised to a predetermined position higher than the stacked object to be packaged, at least part of the top surface of the stacked object to be packaged is covered with the packaging film. a second step;
By lowering the film supply mechanism from the predetermined position while supplying the packaging film to the side surface of the stacked object to be packaged , and rotating the turntable on which the stacked object to be packaged is mounted, a third step of winding the packaging film around the side surface of the laminated object to be packaged so as to form a downward spiral;
and controlling the operations of the film supply mechanism and the turntable so as to execute in that order,
In the third step, the control unit controls the portion of the packaging film covering the upper surface of the laminate of objects to be packaged to be wound spirally downward on the side surface of the laminate of objects to be packaged. When the packaging film covering the upper surface of the laminated body of packaged goods is pulled downward by the package, a downward force acts on the laminated body of packaged goods to fix each of the packages in the vertical direction. controlling the operation of the film feeding mechanism so that
A film wrapping machine characterized by: In the film packaging machine according to claim 1 ,
The control unit controls the operation of the film supply mechanism and the turntable so that the packaging film covers the upper surface of the package stacked on the topmost layer of the package stack in the second step. A film packaging machine characterized by: In the film packaging machine according to claim 1 or claim 2,
The control unit is configured to repeat the first step to the third step two or more times,
The upper surface of one end side of the laminate of objects to be packaged in the horizontal direction is covered with the packaging film in the first second step, and the upper surface of the other end of the laminate of objects to be packaged in the horizontal direction is covered for the second and subsequent times. 2. A film packaging machine, wherein the operations of the film supply mechanism and the turntable are controlled so as to be covered with the packaging film in any of the second steps of 1. above. In the film packaging machine according to claim 1 or claim 2,
A rotation sensor that detects the rotation angle of the turntable at any time,
The control unit is configured to repeat the first step to the third step two or more times,
In the second step after the second time, the control unit causes the packaging film to come into contact with at least one of the corners of the upper surface of the laminated object to be packaged that is not covered by the packaging film. A film packaging machine , wherein the ascending speed of the film supply mechanism or the rotation speed of the turntable is controlled according to the rotation angle of the turntable detected by the rotation sensor. A film packaging method for packaging a stacked object to be packaged in which a plurality of packages are vertically stacked using a packaging film supplied from a film supply mechanism configured to be able to move up and down along a support,
While supplying the packaging film to the side surface of the laminated object to be packaged, the film supply mechanism is raised, and the laminated object to be packaged and the film supply mechanism are relatively rotated to obtain the packaging film. a first step of winding the film around the side surface of the laminate of packaged objects so as to form an upward spiral;
By relatively rotating the laminate of objects to be packaged and the film supply mechanism in a state in which the film supply mechanism is raised to a predetermined position higher than the laminate of objects to be packaged, the upper surface of the laminate of objects to be packaged is removed. a second step in which the packaging film covers at least a portion of
By lowering the film supply mechanism from the predetermined position while supplying the packaging film to the side surface of the laminated object to be packaged, and rotating the laminated object to be packaged and the film supply mechanism relative to each other. a third step of winding the packaging film around the side surface of the laminate of packaged objects so as to form a downward spiral;
with
In the third step, the portion of the packaging film covering the upper surface of the laminate of objects to be packaged is pulled downward by the portion of the packaging film wound spirally downward on the side surface of the laminate of objects to be packaged. Thus, a downward force acts on the laminated body of packaged objects from the packaging film in the portion covering the upper surface of the laminated body of packaged objects so that each of the packages is fixed in the vertical direction, Operation of the film feeding mechanism is controlled
A film packaging method characterized by:

Images