JP3090262B2 - Film folding device in packaging equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for transporting an object to be packaged, forming the film into a tubular shape while stretching a film drawn from a film roll, covering the film on the object to be packaged, and covering both edges of the film. The bottom of the package is overlapped and sealed at the bottom, and the film formed in a cylindrical shape is cut by the cutter between the objects to be packaged, and the front part and the rear part of the cylindrical film cut by the cutter are the objects to be packaged. The present invention relates to a film folding device that folds along a bottom surface of a film.

[0002]

2. Description of the Related Art Conventionally, a film drawn from a film roll is formed into a tubular shape while being stretched, and the film is placed on a package, and both edges of the film are overlapped at the bottom of the package to seal the bottom. A film fold that cuts a film formed in a cylindrical shape between the objects to be packaged with a cutter, and folds excess films at the front and rear portions of the cylindrical film cut by the cutter along the bottom surface of the object to be packaged. The apparatus is disclosed in, for example, Japanese Utility Model Laid-Open No. 1-168403 and Japanese Utility Model Laid-Open No. 2-318.
No. 01 and other publications.

[0003] The folding device in these packaging devices cuts a film formed in a cylindrical shape between cutters by using a cutter, and removes excess film portions at the front and rear portions of the cut cylindrical film. A suction mechanism provided below the packaged object sucks in, and the packaged product is conveyed while pulling the front and rear portions of the tubular film downward, thereby folding the film at the bottom of the packaged product. And
In the front film, the package is conveyed as it is, so that the front film folds to the bottom in a shape that naturally follows the package, and in the case of the rear film, the transport speed of the package is Is folded along the lower part of the packaged object while entangled with the front film by a chain roller rotating at a high speed.

[0004]

As described above, in the folding device of the conventional packaging device, a large suction mechanism is provided to fold the surplus film. There is a problem that the suction at the front and rear ends of the film is not reliable. Another problem is that the cost required for the suction mechanism and the chain roller having a complicated structure is too high.

[0005] Further, since the front and rear films are folded by the pulling force of the film by the suction mechanism, the film tension is weak, and the film on the surface of the package may be wrinkled. In the case of a package formed by this type of packaging device using a film, poor appearance of the package causes a decrease in consumer confidence, and good packaging quality is also required of the packaging device. It is becoming.

Accordingly, the present invention has a simple structure and a reliable film structure in which a surplus film is sandwiched by a film sandwiching member composed of a pair of rollers without providing a large-scale suction mechanism or a chain roller having a complicated structure. It is an object of the present invention to provide a folding device in a packaging device capable of folding and having a beautiful finish on the surface of a package.

Further, according to the present invention, by improving the sandwiching structure by the pair of rollers, the surplus film can be sandwiched so that the overlapped portion at both ends is not strongly sandwiched at the center of the surplus film to be folded. The air inside the tubular film is degassed through the polymerized portion that is not strongly pinched, so that it is possible to prevent the film from swelling, thereby preventing the folding from being performed well or the packaging appearance from being impaired. It is intended to provide a film folding device in a typical packaging device.

[0008]

The gist of the present invention will be described with reference to the accompanying drawings.

[0009] A loading mechanism 2 for loading the package 1, a film feed mechanism 3 for transporting the film F drawn from the film roll R in the same direction as the package 1, and covering both edges of the film F. A bag making mechanism 4 for guiding the package F below and forming the film F into a cylindrical shape, a bottom sealing mechanism 5 for overlapping and sealing both edges of the film F at the bottom of the packaged object 1, and a cylindrical shape. A cutter mechanism 6 for cutting the formed film F between the articles to be packaged 1; and a front part F1 and a rear part F2 of a cylindrical film F provided before and after the cutter mechanism 6 and cut by the cutter mechanism 6. Film holding bodies 18, 19 each comprising a pair of rollers 17 to be held
And a push plate 20 which is provided before and after the cutter mechanism 6 corresponding to the film holding members 18 and 19 and inserts and guides the front portion F1 and the rear portion F2 of the film F into the film holding members 18 and 19. In the film folding device in the packaging device, the front portion F1 and the rear portion F2 of the film F inserted into the film holding members 18 and 19 by the pushing plate 20 are folded along the bottom surface of the packaged object 1. The rear film pinching mechanism comprising the pair of rollers 17 provided on the rear side of the cutter mechanism 6 with respect to the transport direction of the packaged object 1 and holding the rear part F2 of the cylindrical film F cut by the cutter mechanism 6; In the central portion of the film holding portion of the body 19, the overlapping portion G of the both edges of the film F located at the central portion of the bottom surface of the film F formed in a cylindrical shape is stored. Degassing unit air tubular film in F without pinching strongly edge overlap portion G may degassed communicated 40
The present invention relates to a film folding device in a packaging device, wherein

Further, by forming a small-diameter portion at the center of at least one of the rollers 17 of the rear film sandwiching body 19 composed of the pair of rollers 17, the center of the film sandwiching portion facing the pair of rollers 17 is formed. 2. The film folding device according to claim 1, wherein the deaeration section 40 is formed by providing a void section 40A in the section.

Further, by forming a small-diameter portion at the center of both rollers 17 of the rear film sandwiching body 19 composed of the pair of rollers 17, the central portion of the film sandwiching portion facing the pair of rollers 17 is formed. A void 40A is provided in the deaeration section.
40. A film folding device according to claim 2, wherein the film folding device comprises:

Further, the rear portion F2 of the film F inserted into the rear film holding member 19 by the push-in plate 20 is pulled and driven toward the lower side of the packaged object 1 with the movement of the rear film holding member 19. 4. A film folding device according to claim 1, further comprising a rotation mechanism for rotating said roller of said rear film holding body.

Further, a pair of rollers 17 of the rear film holding body 19 are configured to be able to be separated from each other against the elastic body S so that the rear portion F2 of the film F can be held by the pair of rollers 17 in an elastic pressure state. The push plate 20 is configured to be inserted so as to expand the gap between the pair of rollers 17 against the elastic body S and insert the push plate 20. The present invention relates to a film folding device in the packaging device described above.

Further, the pushing plate for inserting and guiding the rear portion F2 of the film F into the rear film holding member 19 is provided.
6. A film in a packaging apparatus according to claim 1, wherein a notch escape portion 39 is provided at a center portion of a lower edge of the film 20 to escape the overlapped portion G at both ends of the film F stored in the degassing portion 40. It relates to a folding device.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention (how to implement the invention) will be briefly described with reference to the drawings, showing the operational effects thereof.

The packaged object 1 containing the contents W such as food in the tray T is carried in by the carrying-in mechanism 2, and the film F pulled out from the film roll R is spread by the film feeding mechanism 3 while being spread by the film feeding mechanism 3. The film F is transported in the same direction as the object 1, and both edges of the film F are guided below the article to be packaged 1 by the bag making mechanism 4, the film F is formed into a cylindrical shape, and both ends of the film F are The edges are overlapped and sealed at the bottom of the package 1. The tubular film F is cut between the packages 1 by a cutter mechanism 6, and is provided before and after the cutter mechanism 6 and a front portion F1 of the tubular film F cut by the cutter mechanism 6. The rear portion F2 is sandwiched between the film sandwiching members 18 and 19 each composed of a pair of rollers 17 by a pressing plate 20.

The front portion F1 of the film F held by the front film holding member 18 is folded along the bottom surface of the packaged object 1 by being transported by the packaged object 1, and is held by the rear film holding member 19. The rear portion F2 of the formed film F is moved by the rear film sandwiching member 19 in the transport direction so that the packaged object 1 is moved.
Will be folded along the bottom surface.

At this time, since the rear portion F2 of the film F is folded after the front portion F1 of the film F is first folded along the bottom surface of the packaged object 1, the rear portion F2 of the film F is folded at the time of folding. Since the front F1 side of the film F cannot be ventilated, if the film F is folded as it is,
Conventionally, the rear portion F2 of the film F was swollen like a balloon and could not be folded neatly. However, in the present invention, when the rear portion F2 of the folded film F Since the overlapping portion G at the center of F is housed and not strongly pinched by the roller 17, the inside of the film F is prevented from adhering to each other, an air passage is secured, and when the rear portion F2 is folded, the overlapping portion G is interposed. The air in the film F can be expelled, preventing the film F from bulging like a balloon, failing to fold well, and impairing the packaging appearance of the package B.

Further, the rear portion F2 of the film F inserted into the rear film holding member 19 by the push-in plate 20 is pulled and driven toward the lower side of the packaged object 1 as the rear film holding member 19 moves. If the rotation mechanism 33 for rotating the roller 17 of the rear film sandwiching body 19 is provided, the rear portion F2 of the film F is further moved downward by the roller 17 of the rear film sandwiching body 19 by a predetermined amount. Since the folding is performed while pulling the package with force, the package can be formed without causing any wrinkles of the film on the surface of the package.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described with reference to the drawings. 1 to 14 show an embodiment of the present invention.

The packaging device of the present invention generally carries in a loading mechanism 2 for loading a packaged object 1 containing contents W such as foods in a tray T, and stretches a film F made of a stretch film pulled out from a film roll R. Film transport mechanism 3 for transporting the packaged object 1 in the same direction as
And a bottom sealing mechanism 5 for guiding the both edges of the film F below the article 1 to form the film F into a cylindrical shape, and for sealing both the edges of the film F by overlapping them at the bottom of the article 1.
And a guillotine-shaped cutter mechanism 6 for cutting the tubular film F between the packages 1, and a front portion of the tubular film F provided before and after the cutter mechanism 6 and cut by the cutter mechanism 6. The folding mechanism 7 includes a folding mechanism 7 for folding the F1 and the rear portion F2 along the bottom surface of the package 1 and a carrying-out mechanism 8 for film-wrapping the package 1 and carrying out the folded package B.

The loading mechanism 2 has an endless chain conveyor 9.
The conveyor 1 is provided at a predetermined interval and can be raised and tilted. The chain conveyor 9 is driven to rotate so that the articles to be packaged 1 are sequentially fed to the film feed mechanism 3 at equal intervals. When the transporting convex portion 10 is in a transportable state, it is inverted when it is moved to the transport side end portion of the chain conveyor 9, and when it is located on the opposite side to the transporting surface, it is tilted and continuous rotary driving is performed. I have.

The film feeding mechanism 3 extends the film F pulled out from the film roll R supported on the upper part of the packaging apparatus, and at substantially the same speed in the same direction as the article 1 to be carried in by the carry-in mechanism 2 while spreading the film F. The film feeding mechanism 3 is provided with an endless belt body 11 whose both ends are supported by rotating rolls, and the endless belt body 11 is vertically overlapped and installed. Are provided in contact with each other, and are provided on the left and right sides with respect to the traveling direction of the packaged object 1. The endless belt body 11 is installed so as to be inclined downward in the traveling direction of the packaged object 1. The film F is sandwiched between both end edges in the width direction between the overlapped belt surfaces of the left and right endless belt bodies 11, and is transported in the traveling direction of the package 1, and the film F is conveyed. Film F gradually from the top
It is to cover.

A side belt conveyor 12 is provided on the transfer direction side of the carry-in mechanism 2 to rotate in opposite directions to pinch and convey the side surface of the article 1 to be packaged, and a carry-out mechanism is provided from the rear end of the carry-in mechanism 2. Up to eight positions, the packaged object 1 and the cylindrical film F are conveyed by the side belt conveyor 12.

The bag making mechanism 4 guides and transports the left and right edges of the film F transported by the film feed mechanism 3 gradually toward the center of the bottom of the article 1 to be packaged. And a film guide rod 13 attached to the loading side.

The film guide rod 13 has a vertical portion 13A from the upper side to the lower side on the carry-in side, is bent at a position slightly lower than the carrying surface of the packaged object 1, and is horizontal from the carry-in side to the carry side. The left and right endless belt members 11 of the film feed mechanism 3 are provided with a bottom seal mechanism 5 from both side edges where the film release portions are provided.
The film F is gradually narrowed so as to squeeze the film F toward a central portion having the same. By the bag making mechanism 4 including the film guide rod 13, the film F is
Are guided toward the center of the bottom of the packaged object 1 to form the film F into a cylindrical shape.

The bottom seal mechanism 5 seals the both edges of the film F guided to the center of the bottom of the packaged object 1 by the bag making mechanism 4 by overlapping and sealing the left and right sides arranged in a contact state. It is composed of a pair of seal rolls 14. The film F in which both edges of the film F are superimposed is conveyed between the seal rolls 14 so that the film F
When the film F is made of a self-compression-bonding material, it is not necessary to provide a heater function. In some cases.

The cutter mechanism 6 cuts the film F formed into a cylindrical shape by sealing the film F at the bottom by the bottom sealing mechanism 5 before and after the article 1 to be packaged. A saw-shaped cutting blade 15 is provided on the upper side.
15 is a guillotine-shaped one provided so as to be movable up and down.

A receiving plate is provided below the conveying surface at a position corresponding to the cutting blade 15 so as to be slightly shifted back and forth from the position corresponding to the cutting blade 15 and moves up and down in response to the vertical movement of the cutting blade 15. 16 are provided. That is, when cutting, the cutting blade 15
So that the lower receiving plate 16 rises in response to the
When the cutting blade 15 is raised after cutting, the receiving plate 16 is lowered and retreats. In this way, at the time of cutting, the cutting blade 15 and the receiving plate 16 approach toward the cylindrical film F, and thereafter the cutting blade 15 and the receiving plate 16 overlap in the vertical direction, and the cylindrical film positioned between them. F is cut, so that good and reliable cutting can be performed.

The folding mechanism 7 according to the present invention comprises a front film holding body 18 and a rear film holding body, each comprising a pair of rollers 17 for holding the excess film of the front part F1 and the rear part F2 cut by the cutter mechanism 6. 19, and a push-in plate 20 provided before and after the cutter mechanism 6 and provided corresponding to the front film holding body 18 and the rear film holding body 19 and for inserting and guiding the front part F1 and the rear part F2 of the film. It is.

For the sake of explanation, for the tubular film F containing the packaged object 1 cut by the cutter mechanism 6, the surplus portion of the packaged object 1 on the transport direction side is set to the front part F1, the front side in the transport direction. The surplus part is defined as the rear part F2, and will be described in the following in a unified manner.

The pushing plate 20 is provided with the cutting blade 15 of the cutter mechanism 6.
A plate-shaped member that hangs down corresponding to the positions of the front film holding body 18 and the rear film holding body 19 is attached at predetermined intervals before and after the cutting blade 15, and the film is attached. When cutting the film F, the cutting blade 15 descends in unison with the lowering operation of the cutting blade 15, and the front part F1 and the rear part F2 of the cut film F are held by the film holding members 18, 19.
It is intended to guide the user towards.

The front and rear film holding members 18 and 19 have the same configuration, and a pair of rollers 17 are provided in opposition to each other.
The axis of one roller 17 is fixed to the holding frame 21, the axis of the other roller 17 is pivotally supported by a moving frame 22 that can move toward and away from the holding frame, and the holding frame 21 and the moving frame 22 are The roller 17 supported by the moving frame 22 is locked by the spring S.
Is pressed against the roller 17 of the holding frame 21 in a resiliently pressed state, and the end of the front portion F1 or the rear portion F2 of the film F is sandwiched between the roller 17 together with the pressing plate 20 and then pressed. Only the plate 20 comes out of the roller 17 with the raising of the cutting blade 15, and holds the front part F1 and the rear part F2 between the film F left between the rollers 17. The front film sandwiching body 18 and the rear film sandwiching body 19 are arranged such that the upper end of the roller 17 is substantially the same height as or slightly below the bottom surface (conveying surface) of the article 1 to be packaged.

When folding the front portion F1 of the film F, the front film holding member 18 holds only the packaged object 1 while holding the front portion F1 of the film F on the front film holding member 18 without providing a moving mechanism. Film F naturally
Is bent along the bottom surface of the article to be packaged 1.

In the front film holding body 18, the front portion F1 of the film F inserted into the front film holding body 18 by the pushing plate 20 is transferred together with the object 1 to be packaged. A rotating mechanism 23 is provided for rotating and driving the roller 17 of the front film holding body 18 so as to be pulled toward the lower report side of the object 1.

In this case, the rotating mechanism 23 of the front film holding body 18 is provided with a driven pulley section 24 at the end of the roller 17 on the holding frame 21 side, which is a fixed side, and a driving mechanism provided on a predetermined power shaft 25. An endless string-shaped belt 27 is stretched between the pulley 26 and the pulley 26. The power shaft 25 rotates along with the transfer of the packaged object 1 by the side belt conveyor 12, thereby rotating the driven pulley portion 24 via the string-shaped belt 27, and rotating the roller 17 coaxial with the driven pulley portion 24. The front portion F1 of the film F is held by the frictional force with the surface of the front portion F1 of the film F held between the rollers 17 that are rotationally driven and opposed to each other with the predetermined pulling force. The folding is performed while pulling the package 1 downward. Therefore, the roller 17 of the film F
In addition to the pinching of the package F, the front portion F1 of the film F is folded while exerting an expanding tension by the pulling force, so that the package B having good appearance quality can be obtained without wrinkling of the film F on the surface of the package B. Can be formed.

In this embodiment, the front film holding member 18 including the pair of rollers 17 is provided at the center of the film holding portion.
A storage portion 37 is provided for storing the overlapped portion G at both ends of the film F located at the center of the bottom surface of the cylindrical film F.

More specifically, a small-diameter portion is formed at the center of both rollers 17 of the front film-clamping body 18 comprising the pair of rollers 17 so that the pair of rollers 17 face the film-clamping portion. A space 37A is provided at the center of the
37.

Therefore, as described above, the bottom seal mechanism 5
Since the left and right edges of the film F are overlap-sealed at the bottom center and formed into a tubular shape and packaged in the packaged object 1, the film F is cut by the cutter mechanism 6 and folded along the bottom surface of the packaged object 1. At the center of the front portion F1 of the film F, there is a superposed portion G where a number of films overlap and are thick. However, the overlapping portion G at both ends of the film at the center of the front portion F1 of the film F to be folded is formed by the front film holding member 18.
The storage portion 37 provided at the center of the holding portion of the pair of rollers 17
Therefore, the film sandwiched by the pair of rollers 17 is less likely to be deviated, and even if there is the thick overlapping portion G at the center of the film, the front portion F1 of the film F to be folded can be evenly sandwiched. . Therefore, the tension caused by the film clamping and the tension by the rotating mechanism 23 are reliably applied evenly to the front F1 of the film F clamped by the rollers 17 while the front F1 of the film F is clamped.
Can be folded into the bottom surface of the packaged object 1 without causing wrinkles.

Further, in this embodiment, the storage portion 37 exhibiting the above-described functions and effects is obtained by improving the roller 17 as described above.
In addition, by providing a small diameter portion on both of the pair of opposed rollers 17, it is possible to easily form the storage portion 37 having a sufficient size, and it is excellent in mass productivity without production cost, and is extremely practical Excellent in sex.

On the other hand, unlike the simple folding of the front portion F1 of the film F, the folding of the rear portion F2 of the film F is different from the simple folding of the front portion F1 of the film F.
Must be moved in the direction of transport of the packaged object 1.

In this embodiment, the rear film holding member 19 is used.
A horizontal moving mechanism 28 is provided for independently moving the object to the package 1 in the transfer direction.

The horizontal moving mechanism 28 is provided with a slide shaft 29 provided in parallel with the transport direction of the article 1 to be packaged, and penetrated by the slide shaft 29 so as to be slidable along the slide shaft 29. The rear film holding body 19 is attached to the slide body 30, and one end of the slide body 30 is connected to the slide body 30, and the other end of the slide body 30 is resiliently attached to the peripheral surface of the rotating cam plate 31. The rear film sandwiching body 19 is provided so as to be in contact with and move in the horizontal direction, that is, in parallel with the transport direction of the packaged object 1 via an operating rod 32 having a central portion as a rotation fulcrum.

More specifically, the cutting blade 15 and the pushing plate 20 of the cutter mechanism 6 descend, and the front portion F of the cut film F
1 and the rear portion F2 are inserted into and guided by the front film holding member 18 and the rear film holding member 19 so that the front film holding member
18 and the rear film holding body 19,
The shape of the cam plate 31 is set so that the rear film sandwiching body 19 horizontally moves in the transport direction after the cutting blade 15 is raised.

At this time, the packaged object 1 is stopped, and only the rear film holding body 19 holding the rear portion F2 of the film F moves in the transport direction of the packaged product 1, so that the rear portion F2 of the film F is unwrapped. The object 1 is folded along the bottom surface.

In this case, in the apparatus of the present invention, the rear film holding member 19 is rotated by the horizontal moving mechanism 28 to rotate the roller 17 of the rear film holding member 19. A mechanism 33 is provided.

The rotation mechanism 33 of the roller 17 of the rear film holding body 19 meshes with the gear 34 provided at the end of the roller 17 on the holding frame 21 side, which is the fixed side, and the machine base 35 of the packaging apparatus.
And a rack body 36 having a predetermined length substantially parallel to the transport direction of the packaged object 1. By doing so, the gear 34 of the roller 17 meshes with the rack 36 with the horizontal movement of the rear film sandwiching body 19 in the transport direction of the packaged object 1 necessary for the folding operation of the rear part F2 of the film F. By rotating the roller 17, the film F sandwiched between the rollers 17 that are rotationally driven and opposed to each other is rotated.
Folding is performed while pulling the rear portion F2 of the film F toward the lower side of the packaged object 1 with a predetermined pulling force by the frictional force with the surface of the rear portion F2.

In this way, the rear portion F2 of the film F can be easily folded, and the rear portion F2 of the film F is folded under a predetermined force while being pulled downward by a predetermined force. The package B can be formed without generating wrinkles.

Also, with the horizontal movement of the rear film holding member 19, the roller 17 of the rear film holding member 19 rotates so as to pull the rear portion F2 of the film F downwardly of the article 1 to be packaged. A single drive source can produce a rotational drive of the roller 17 of the rear film sandwiching body 19, and the structure can be simplified.

Incidentally, the rear portion F2 of the film F sandwiched by forming a number of concave stripes 38 in a state of being juxtaposed in the rotation direction on one circumferential surface of the pair of rollers 17 of the rear film sandwiching member 19 is good. And

In this embodiment, the overlapped portion G at both ends of the film F located at the center of the bottom surface of the cylindrical film F is provided at the center of the film holding portion of the rear film holding body 19. There is provided a deaeration section 40 which allows the air in the tubular film F to communicate and deaerate without strongly sandwiching the overlapped portion G at both ends of the film F to be housed.

Specifically, by forming a small-diameter portion at the center of both rollers 17 of the rear film sandwiching member 19, the small-diameter portion is formed at the center of the film sandwiching portion where the pair of rollers 17 face each other. The deaeration section 40 is formed by providing a void section 40A made of

Therefore, when the rear portion F2 of the film F is clamped by the roller 17, the overlapped portion G at the center of the film F is housed in the deaeration section 40 and is not strongly clamped by the roller 17, so that the inside of the film F The air in the film F can be expelled through the overlapped portion G when the rear portion F2 is folded in, so that the film F swells like a balloon and the folding can be performed well. Or the appearance of the package is not impaired.

Further, since the degassing is performed using the superposed portion G, the packaging process is not hindered, and the roller 17 of the rear film sandwiching member 19 is simply subjected to the simple improvement. Because it can be folded while degassing, it is excellent in mass productivity without production cost.Moreover, by providing a small diameter portion on both of the pair of rollers 17, a sufficiently large degassing portion 40 can be easily formed. It is extremely practical. In addition, by providing the deaeration section 40 at the center between the rollers 17,
Has an effect that it can be applied as it is even when the width dimension of the 変 化 changes.

In this embodiment, the rear film holding member is used.
At the center of the lower edge of the push plate 20 for inserting and guiding the rear portion F2 of the film F into the notch 19, there is provided a cutout escape portion 39 for escaping the overlapping portion G of the both edges of the film F stored in the degassing portion 40. . That is, the notch groove 39 having a width substantially matching the width of the overlap portion G (the width of the degassing portion 40) is formed on the pressing plate 20 to form the notch escape portion 39, so that the pressing plate 20 is
When the rear portion F2 of the film F is inserted between the rollers 17 and 17 of the rear film holding member 19 to be pushed and guided, the overlapped portion G at both ends of the film F is not pressed down by the lower edge of the pushing plate 20 and the air is not pressed. Only the left and right films F of the overlapped portion G are pressed down and guided between the rollers 17 of the rear film holding member 19 while securing a passage.

Therefore, since the overlapped portion G is not pressed during the push-in guide by the push-in plate 20, an excessive portion of the rear portion F of the film F is also provided in the push-in guide.
2 is configured to be deaerated from the polymerization portion G.

The operation of the apparatus according to the present invention will be described below with reference to FIGS. 9 to 14.

The package 1 is carried in, and a film F conveyed in the same direction as the package 1 is formed into a cylindrical shape. When the film F is transferred to the position of the mechanism 6 and the film F is transported between the packages 1, the side belt conveyor 12 stops, and the cutter mechanism 6 operates. The film F carried in at this time is the front side F1 of the film F of the front packaged object 1.
Has already been folded.

When the cutting blade 15 and the pushing plate 20 are lowered in unison, the cutting blade 15 first comes into contact with the film F, the film F is cut, and then the front and rear pushing plates 20 come into contact with the film F by further descending. The front portion F1 and the rear portion F2 of the cut film F are guided between the rollers 17 of the front film holding member 18 and the rear film holding member 19, and are pushed against the pressing force of the spring S ( FIG.
reference).

After that, the cutting blade 15 and the front and rear push plates 20
Rises congruently, and the front F1 and the rear F2 of the film F
Only the front film holding member 18 and the rear film holding member 19 are left (see FIG. 10). At this time,
The storage portion 37 provided on the roller 17 of the front film holding body 18 stores the overlapped portion G at the center of the film F. In addition, the overlap portion G is similarly stored in the deaeration section 40 provided on the roller 17 of the rear film holding body 19.

Next, only the rear film sandwiching body 19 moves in the transport direction with respect to the packaged object 1 in the stopped state by the operation of the horizontal moving mechanism 28. At this time, the rear film clamp 19
The roller 17 rotates with the movement of the rear film holding member 19 by the rotation mechanism 33 provided in the
Folding is performed along the bottom surface of the packaged object 1 while pulling the rear portion F2 downward of the packaged object 1 (FIGS. 11 and 1).
2). At this time, the rear portion F2 of the film F is sandwiched by the rollers 17 of the rear film sandwiching member 19 and tension is given, but the overlapped portion G of the film F is housed in the deaeration section 40 and is not strongly clamped. Therefore, the inside of the film F is prevented from sticking to each other, and an air passage is secured, so that the film F
Since the air inside is expelled, the film F does not bulge like a balloon.

In this way, the rear portion F2 of the film F can be easily folded, and the rear portion F2 of the film F is folded under a predetermined force while being pulled downward by a predetermined force. The package B can be formed without further generation of wrinkles.

Subsequently, when the side belt conveyor 12 is driven to convey the packaged object 1 together with the film F, the subsequent packaged object 1 is held on the front film holding body 18 with the front portion F1 of the film F held therebetween. Is transported, the packaged object 1 is transported to the fixedly provided front film holding body 18, so that the front portion F1 of the film F is naturally folded along the bottom surface of the packaged object 1. At this time, the front film clamp
The rotation of the rotating mechanism 23 provided in the
The roller 17 rotates along with the transport of the film F, and the folding is performed along the bottom surface of the package 1 while pulling the front portion F1 of the film F downwardly of the package 1. The front package 1 is transferred toward the unloading mechanism 8 as a completed package B in which the front portion F1 and the rear portion F2 of the film F are folded (see FIGS. 13 and 14).

In this manner, folding is performed while pulling the front portion F1 of the film F downward with a predetermined force with the predetermined force, so that the package B is formed without wrinkling of the film F on the surface of the package B. can do. At this time, the overlapping portion G of the thick film F is
Because it is stored in the storage part 37 provided in the roller 17 of 18,
Since the film F can be uniformly held and tension can be uniformly applied, good folding can be performed without wrinkles.

In this embodiment, the cutting blade is provided on the upper part.
15 and the pushing plate 20 were provided, and the receiving mechanism 16 was provided at a lower position corresponding to the cutting blade 15 to constitute the cutter mechanism 6.
A receiving plate may be provided at an upper portion, and a cutting blade may be provided at a lower position corresponding to the receiving plate position, or the receiving plate may be provided both before and after the cutting blade.

The rollers 17 of the film holding members 18 and 19
Can be adjusted by appropriately selecting the elastic force of the spring S hooked between the holding frame 21 supporting the roller 17 and the moving frame 22. This makes it possible to adjust the pulling force of the film F at the time of folding, for example, the tray T
Film F according to the type of material W and contents W to be stored.
It is also possible to adjust the tension. That is, when a tight package B is formed by increasing the pulling force of the film F, the elastic force of the spring S is increased to increase the pressing force of the rollers 17 of the film sandwiching members 18 and 19. The film F sandwiched between the rollers 17 is hardly slipped, and the force of pulling the film F downward is increased to perform folding. In this case, the effects of the storage section 37 and the deaeration section 40 become particularly important.

Conversely, when the contents W or the tray T to be packaged are made of a material that is weak and easily crushed, it is necessary to form a soft package B. In this case, the elastic force of the spring S is weakened to reduce the film thickness. The pressing force of the rollers 17 of the holding members 18 and 19 is weakened to make the film F held between the rollers 17 slippery, and the force of pulling the film F downward is weakened to perform folding.

In the present embodiment, when the rear portion F2 of the film F is folded, in the state where the conveyance of the packaged object 1 is stopped, only the rear film holding member 19 is horizontally moved in the conveying direction of the packaged object 1. The folding of the film F is performed with the rear portion F2 of the film F along the bottom surface of the package 1.
Is transported at a higher speed than the transport speed, the rear film holding body 19 is horizontally moved in the transport direction of the packaged object 1 or the packaged object 1 is temporarily moved in the reverse direction so that the rear portion F2 of the film F is moved. May be configured to be inserted.

Although the horizontal moving mechanism 28 is driven by the cam plate 31 and the operating rod 32, a reciprocating moving mechanism such as a cylinder device may be used.

The storage capacity of the storage section 37 and the deaeration section 40 (the size of the gaps 37A and 40A) is desirably large enough to completely store the overlapped portion G, but not so large. The design is made in consideration of the possibility that the roller holding force is reduced if the amount is excessively taken. Even if the overlapped portion G cannot be completely stored and the roller is partially held by the roller 17, the above operation and effect can be sufficiently exhibited.

[0071]

According to the present invention, as described above, the surplus film is sandwiched by the film sandwiching member composed of a pair of rollers, so that a simple structure and reliable film folding can be achieved. It is possible to provide a folding device in a packaging device with a beautiful finish on the body surface.

Moreover, the sandwiched structure of the pair of rollers is merely provided with a deaeration section for accommodating the overlapped portions at both ends of the film, and the overlapped portions at both ends at the center of the film to be folded are not strongly sandwiched by the rollers. Since the air passage is secured through the overlapped portion that is not sandwiched and the air in the cylindrical film is degassed, it is possible to prevent the film from swelling, thereby making it impossible to fold well or impairing the packaging appearance. It is a film folding device in an innovative packaging device.

The invention according to claim 2 and claim 3
According to the invention described in the description and the fifth aspect, a film folding device in an epoch-making packaging device capable of realizing a film folding device in a packaging device exhibiting the above-described functions and effects with an extremely simple configuration is provided.

In particular, according to the third aspect of the present invention, a sufficiently large deaeration portion can be easily formed.

Further, in the invention according to the fourth aspect, furthermore, the folding is performed while pulling the rear portion of the film inserted into the rear film holding body by the pushing plate downward by a predetermined force with a predetermined force. The film folding device in a more revolutionary packaging device that can form a package without causing wrinkles of the film on the body surface.

According to the sixth aspect of the present invention, since the overlapping portions at both ends of the film to be housed in the deaeration section are not directly pressed and pushed by the pushing plate, the air passage is ensured while securing the air passage. The film can be evenly held between the holding portions on both sides of the film in an appropriate holding state. Further, even at the time of this pushing guide, the air can be evacuated satisfactorily through the overlapping portion which is not held, and the film swells more reliably. As a result, a film folding device in an epoch-making packaging device that can prevent the folding from being performed well and the packaging appearance from being impaired can be prevented.

[Brief description of the drawings]

FIG. 1 is a side view showing the overall configuration of the present embodiment.

FIG. 2 is a plan view showing the overall configuration of the present embodiment.

FIG. 3 is a perspective view showing a film feeding mechanism of the present embodiment.

FIG. 4 is a front view showing a side belt conveyor, a cutter mechanism, and a bottom seal mechanism of the embodiment.

FIG. 5 is a side view showing a main part of the embodiment.

FIG. 6 is a perspective view showing a main part of the embodiment.

FIG. 7 is a rear view showing a side belt conveyor, a cutter mechanism, and a rear film sandwiching body of the embodiment.

FIG. 8 is an enlarged plan view of a main part of the present embodiment.

FIG. 9 is an operation explanatory side view showing a state in which the front and rear portions of the film are pushed into the front film sandwiching body and the rear film sandwiching body and guided by the pushing plate of the present embodiment.

FIG. 10 is an operation explanatory side view of a state where a front portion and a rear portion of the film are sandwiched between the front film sandwiching member and the rear film sandwiching member of the present embodiment.

FIG. 11 is an operation explanatory side view showing an operation of moving a rear film holding body of the present embodiment and folding a rear portion of the film.

FIG. 12 is an operation explanatory side view showing a state at the time of completion of the folding operation of the rear portion of the film of the present embodiment.

FIG. 13 is an operation explanatory side view showing an operation in which an object to be packaged is conveyed above the front film sandwiching body of this embodiment and the front part of the film is folded.

FIG. 14 is an operation explanatory side view showing a state where the folding operation of the front portion of the film of the present embodiment is completed.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Packaged material 2 Loading mechanism 3 Film feed mechanism 4 Bag making mechanism 5 Bottom seal mechanism 6 Cutter mechanism 17 Roller 18 Front film sandwiching body 19 Rear film sandwiching body 20 Push-in plate 33 Rotating mechanism 39 Notch escape section 40 Deaeration section 40A Void F Film F1 Front F2 Back G Gap R Film Roll S Elastic

Claims (6)

(57) [Claims] 1. A loading mechanism for loading an article to be packaged, a film feeding mechanism for transporting a film drawn from a film roll in the same direction as the article to be packaged, and moving both edges of the film downward under the article to be packaged. A bag making mechanism for guiding and forming a film into a tubular shape, a bottom sealing mechanism for overlapping and sealing both edges of the film at the bottom of the packaged product, and a tubular film formed between the packaged products. A cutter mechanism for cutting, and a film sandwiching body including a pair of rollers each sandwiching a front portion and a rear portion of the cylindrical film cut by the cutter mechanism provided before and after the cutter mechanism,
A push plate is provided in front of and behind the cutter mechanism corresponding to the film sandwiching body, and a push plate for inserting and guiding the front and rear portions of the film is provided on the film sandwich, and the push plate is inserted into the film sandwich body. In a film folding device in a packaging device configured to fold a front portion and a rear portion of the film along a bottom surface of the packaged object, the cutter mechanism provided on a rear side of the cutter mechanism with respect to a transport direction of the packaged product. At the center of the film-clamping portion of the rear film-clamping body composed of the pair of rollers that clamps the rear portion of the tubular film cut by, the film located at the center of the bottom surface of the film formed in the cylindrical shape The overlapping portion at both ends is housed, and the air inside the tubular film communicates and can be degassed without strongly sandwiching the overlapping portion at both ends of the film. Film folding device in the packaging apparatus characterized in that a part. 2. A small-diameter portion is formed at a central portion of at least one of the rear film sandwiching members formed of the pair of rollers, so that a gap portion is formed at a central portion of the film sandwiching portion opposed by the pair of rollers. 2. The film folding device in the packaging device according to claim 1, wherein the deaeration unit is configured by providing a deaeration unit. 3. A small-diameter portion is formed at the center of both rollers of the rear film sandwiching body composed of the pair of rollers, so that a gap is formed at the center of the film sandwiching portion facing the pair of rollers. 3. A film folding device in a packaging device according to claim 2, wherein said degassing section is provided. 4. The rear film holding body such that the rear part of the film inserted into the rear film holding body by the pushing plate is pulled toward the lower side of the packaged object along with the movement of the rear film holding body. 4. A film folding device according to claim 1, further comprising a rotating mechanism for rotating said roller. 5. A pair of rollers of said rear film sandwiching member are configured to be able to be separated from each other against an elastic body, and a rear portion of said film is configured to be held by said pair of rollers in an elastic pressure state. The film folding device according to any one of claims 1 to 4, wherein the plate is configured to push and widen a gap between the pair of rollers against the elastic body so as to be inserted. 6. A notch escape portion is provided at a central portion of a lower edge of the pushing plate for inserting and guiding a rear portion of the film into the rear film sandwiching body, and for escaping an overlapped portion of both edges of the film housed in the degassing portion. Claim 1 characterized by the above-mentioned.
6. A film folding device in the packaging device according to 5.