WO1998054055A1 - Film tuck-in device of packaging apparatus - Google Patents

Abstract

A film tuck-in device comprising a loading mechanism (2) for loading an article (1) to be packaged in the device; a film feeding mechanism (3) for transferring a film (F) drawn out of a film roll (R) in the same direction where the article (1) is moved; a bag-making mechanism (4) for guiding the two edges of the film (F) to underneath the article (1) to form the film (F) into a tube; a bottom sealing mechanism (5) for superposing and sticking the edges one on the other at the bottom of the article (1); a cutter mechanism (6) for cutting the tubular film (F) between the article (1) and another article (1); film pinchers (18, 19) including a pair of rollers (17, 17) provided before and after the cutter mechanism (6) in the transferring direction of the article (1) and adapted to respectively pinch the front end (F1) and the rear end (F2) of the tubular film (F); push-in plates (20) provided before and after the cutter mechanism (6) correspondingly to the film pinchers (18, 19) and adapted to guide and insert the front end (F1) and the rear end (F2) into the respective film pinchers (18, 19); and rotating mechanisms (23, 33) for rotating the rollers (17) of the film pinchers (18, 19) so as to pull the front end (F1) and the rear end (F2) inserted into the film pinchers (18, 19) toward the lower part of the article (1) while tucking in the tubular film (F).

Description

 Description Folding device for packaging equipment Technical field

 According to the present invention, a package is carried in, a film drawn out of a film roll is stretched, a film is formed into a tubular shape while covering the package, and both edges of the film are overlapped on the bottom of the package. At the same time, the bottom is sealed, and the film formed into a cylindrical shape is cut between the objects to be packaged with a cut, and the front and rear portions of the cylindrical film cut by the cut are formed along the bottom surface of the package. The present invention relates to a film folding device that folds together. Background art

 Conventionally, a film drawn from a film roll is stretched and formed into a cylindrical shape, and the film is placed on a package, and both edges of the film are overlapped at the bottom of the package and sealed at the bottom to form a tube. The film that has been cut is cut between the objects to be packaged by a cutting machine, and the front film and the package that are located on the front side of the packaged object are cylindrical excess film portions generated when the film is cut by the cutting machine. A film folding device that folds the rear film located on the rear side of the product along the bottom surface of the package, for example, is disclosed in Japanese Utility Model Laid-Open Publication No. — Proposed in Japanese Patent Publication No. 318001.

The folding device in these packaging devices cuts a cylindrically formed film between the wrapped objects with a cutter, and comprises a cylindrical front film and a rear film generated when the film is cut. The surplus film is sucked by the sucking bow I mechanism provided below the package, and the package is transported while pulling the front film and the rear film downward. In the front film, the package is conveyed as it is, so that the front film is folded on the bottom under the package naturally and along the rear film. Is folded along the lower part of the packaged object while entangled with the rear film by a chain roller rotating at a speed higher than the conveying speed of the packaged object. As described above, in the folding device of the conventional packaging device, since a large suction mechanism is provided for folding the surplus film, there is a problem of noise of the suction mechanism and an end of the front film and the rear film. There is a problem that the suction of the part is not reliable. There is also a problem that the cost required for the suction mechanism and the chain roller having a complicated structure is too high.

 Also, since the front and rear films are folded by the pulling force of the film by the suction mechanism, the film tension is weak, wrinkles are generated on the film on the surface of the package, and the front and rear films are cleanly wrapped. It may not be folded into the lower surface of the product, especially in the case of a package formed by this type of packaging device using a stretch film. Good packaging quality is also required of packaging equipment. Therefore, the present invention provides a folding device in a packaging device which has a simple structure without providing a large-scale suction mechanism and a chain roller having a complicated structure, enables reliable film folding, and has a clean finish on the surface of the package. It is intended for that purpose. Disclosure of the invention

The present invention generally provides a carry-in mechanism for carrying in a packaged object formed of, for example, a tray containing food, and a pair of right and left endless endless belts for transferring a film drawn from a film roll in the same direction as the packaged object. A film feeding mechanism composed of a belt, a bag making mechanism for guiding both end edges of the film below the article to be packaged and forming the film into a tubular shape, and sealing by overlapping both edges of the film at the bottom of the article to be packaged A bottom seal mechanism, a guillotine-like force mechanism for cutting a tubular film between the objects to be packaged, and a tubular mechanism provided before and after the cut mechanism and cut by the cutter mechanism. A film holding member comprising a pair of rollers for holding a front portion and a rear portion of the film; and a film holding member provided before and after the cutting mechanism corresponding to the film holding member. A pushing plate for inserting and guiding the front and rear portions of the film into the holding body; and a front and rear portion of the film inserted into the film holding body by the pushing plate, and Pull downward Since a rotating mechanism for rotating the rollers of the film holding body is provided so as to be tensioned, the front and rear portions of the film are moved downward by a predetermined amount by the rollers of the front and rear film holding bodies. Since the folding is performed while pulling with force, the package can be formed without wrinkling of the film on the surface of the package. Also, when folding the rear film, the rear film sandwiching body for folding the rear film is provided with a horizontal moving mechanism that moves in the transport direction of the packaged object, so that the rear film can be easily folded. In addition, in this structure, a rotating mechanism for rotating the roller of the film holding body is provided so as to pull and drive the excess film portion at the rear toward the lower side of the article to be packaged. Since the folding is performed while pulling the object downward with a predetermined force, the package can be formed without wrinkling of the film on the surface of the package.

 At this time, a rack body is provided on the machine base of the packaging device, and a gear is provided on one of the roller shafts of the rear film holding body, so that the film rear holding body moves with the rear film holding body by the horizontal moving mechanism. Then, the gear meshing with the rack body rotates, and a rotation mechanism for rotating the roller of the rear film holding body is provided, so that the roller of the film holding body is moved with the horizontal movement of the rear film holding body. Since the rear film rotates so as to be pulled downward from the packaged object, a single drive source for horizontal movement can generate the rotation drive of the rollers of the film holding body, and the structure can be simplified. Is also possible.

Further, an opening device is provided for releasing the holding of the rear film holding body at the moving end after the rear film holding body is moved by a predetermined distance by the horizontal moving mechanism, and the folding of the rear film is completed. By releasing the rear film sandwiching state by the rear film sandwiching body later, when the folding of the rear film is completed and the packaged object is transported, the rear film can freely escape from the rear film sandwiching body. Therefore, even if the rear film is sometimes too long due to the folded state or the variation of the cutting position, it is possible to prevent the rear film from being peeled off from the lower surface of the packaged object. BRIEF DESCRIPTION OF THE FIGURES FIG. 1 is a side view showing the overall configuration of one embodiment of the present invention, FIG. 2 is a plan view showing the overall configuration of one embodiment of the present invention, and FIG. FIG. 4 is a perspective view showing a film feed mechanism according to an embodiment of the present invention. FIG. 4 is a front view showing a side belt conveyor and a cutting mechanism according to an embodiment of the present invention. FIG. FIG. 6 is a side view showing a main part of one embodiment of the present invention, FIG. 6 is a side view showing a main part of one embodiment of the present invention, and FIG. FIG. 8 is a plan view showing a film holding body, FIG. 8 is a plan view showing a rear film holding body according to one embodiment of the present invention, and FIG. FIG. 10 is a plan view showing the operation of the embodiment of the present invention. FIG. 11 is a diagram showing the operation of the embodiment of the present invention. FIG. 12 is a diagram showing an operation in one embodiment of the present invention, and FIG. 13 is a diagram showing an operation in one embodiment of the present invention. FIG. 15 is a diagram showing an operation in one embodiment of the present invention. FIG. 15 is a diagram showing an operation in one embodiment of the present invention. FIG. 16 is a diagram showing an operation in one embodiment of the present invention. It is a figure which shows an effect | action. BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 to FIG. 16 show one embodiment of the present invention.

 The packaging apparatus of the present invention generally includes a loading mechanism 2 for loading a packaged object 1 containing contents W such as food in a tray T, and a film F made of a stretch film drawn out from a film roll R. A film feed mechanism 3 for transporting the package F in the same direction as the package 1, a bag making mechanism 4 for guiding both edges of the film F below the package 1 to form the film F into a cylindrical shape, and both edges of the film F A bottom seal mechanism 5 that overlaps and seals the bottom of the package 1, a guillotine-shaped cut mechanism 6 that cuts the cylindrical film F between the packages 1, and a cut mechanism 6 Folding mechanism 7 that folds front and rear cylindrical films F 1 and F 2 that are cut and cut by cutting mechanism 6 along the bottom surface of package 1 and film packaging 1 And insert the completed package B Composed from the carry-out mechanism 8 which is out.

The loading mechanism 2 can be raised and tilted at predetermined intervals on an endless chain conveyor 9 By providing a convex portion 10 and rotating the chain conveyor 9, the packaged objects 1 are sequentially fed toward the film feed mechanism 3 at equal intervals. When the transport convex portion 10 is located on the transport surface, the transport convex portion 10 stands up and becomes capable of transporting the packaged object 1, and is inverted when the transport convex portion 10 moves to the transport-side end portion of the chain conveyor 9. However, when it is located on the opposite side of the transport surface, it is tilted so that continuous rotary drive is performed.

 As shown in FIG. 3, the film feed mechanism 3 extends the film F drawn from the film roll R supported on the upper part of the packaging apparatus, and extends almost in the same direction as the packaged object 1 carried in by the carry-in mechanism 2 while spreading the film F. The film feed mechanism 3 is provided with an endless belt 11 whose both ends are supported by rotating rolls. The belt surfaces 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 transported in the traveling direction of the package 1 with both widthwise edges sandwiched between the 11 superposed belt surfaces of the left and right endless belts, and is conveyed. The film F is gradually covered from the upper surface of the object 1.

 A side belt conveyor 12 is provided on the transporting direction side of the loading mechanism 2 to rotate in opposite directions to pinch and transport the side surface of the package 1, and the loading mechanism 2 is provided at the rear end of the loading mechanism 8 from the rear end. Up to this point, the packaged object 1 and the cylindrical film F are conveyed by the side belt conveyor 12.

 The bag making mechanism 4 guides and transfers the left and right edges of the film F transferred by the film feed mechanism 3 gradually toward the center of the bottom of the packaged object 1. It consists of a film guide rod 13 attached to the side.

The film guide rod 13 has a vertical portion 13 A from the upper side to the lower side on the carry-in side, and is bent at a position slightly lower than the carrying surface of the packaged object 1 to be horizontal from the carry-in side to the carry side. The left and right endless belt bodies 11 of the film feed mechanism 3 are provided on the left and right sides in a shape having a portion 13B. The film F is gradually narrowed so as to squeeze the film F toward the center part where the mechanism 5 is located. By the bag-making apparatus 4 composed of the film guide rods 13, the left and right edges of the film F are guided toward the center of the bottom of the package 1 with respect to the package 1, thereby forming the film F into a cylindrical shape. Things.

 The bottom sealing mechanism 5 seals both end edges of the film F guided to the center of the bottom of the article to be packaged 1 by the bag making mechanism 4, and a pair of left and right arranged in a contact state. It consists of a seal roll 14. This is to seal the bottom of the film F by sandwiching and transporting the film F with the both edges of the film F superposed between the seal rolls 14, and when the material of the film F is made of a self-pressing material, It is not necessary to provide a heat-and-water function, but in some cases, the seal port 14 may be made to have a heat-and-water function to increase the adhesion.

 The force cutter mechanism 6 cuts the film F formed into a cylindrical shape with the film F sealed at the bottom by the bottom sealing mechanism 5 before and after the packaged object 1, and above the transport surface of the packaged object 1. A guillotine-shaped cutting blade 15 is provided with a saw-shaped cutting blade 15 so as to be vertically movable. ·

 In addition, below the conveying surface at the position corresponding to the cutting blade 15, it is installed 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. A receiving plate 16 is provided. That is, the lower receiving plate 16 is raised in response to the lowering of the cutting blade 15 at the time of cutting, and when the cutting blade 15 is raised after cutting, the receiving plate 16 is lowered and retracted. ing. Thus, at the time of cutting, the cutting blade 15 and the receiving plate 16 approach the cylindrical film F, and then the cutting blade 15 and the receiving plate 16 overlap in the vertical direction, and are located therebetween. The tubular film F is cut, so that good and reliable cutting can be performed.

The folding mechanism 7 includes a front film holding member 18 including a pair of rollers 17 for holding the front film F1 and the rear film F1, which are surplus films generated when the cutter mechanism 6 cuts the film. And the rear film sandwicher 19 are provided. The front film F1 and the rear film F are provided before and after the cut-off mechanism 6, and are provided corresponding to the front film sandwicher 18 and the rear film clamp 19. And a push-in plate 20 for inserting and guiding 2. For the sake of explanation, for the cylindrical film F containing the packaged material 1 cut by the cutting mechanism 6, the transport direction side of the packaged material 1 is the front film F1, and the transport direction front side is the rear portion. It is defined as film F2, and will be described below in a unified manner.

 The pushing plate 20 is integrally attached to the cutting blade 15 of the cutting mechanism 6, and cuts 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. It is attached at a predetermined interval before and after the blade 15, and when cutting the film F, it descends in unison with the descending operation of the cutting blade 15, and the excess film F generated by cutting This is to insert and guide a certain front film F1 and rear film F2 toward the film holding members 18 and 19.

 The front and rear film sandwiching members 18 and 19 have the same configuration, a pair of mouth rollers 17 are provided facing each other, and the axis of one roller 17 is fixed to the holding frame 21. The axis of the other roller 17 is 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 hooked to each other by a spring S. Roller 17 supported by 2 is pressed against roller 17 of holding frame 2 1 in a resiliently pressed state, and the ends of front film F 1 and rear film F 2 are pushed in. 20 and between the rollers 17, and then only the pushing plate 20 comes out of the rollers 17 as the cutting blade 15 rises and the front film F 1 and the rear film F 2 left between the rollers 17. Is sandwiched. The front film holding member 18 and the rear film holding member 19 are positioned so that the upper end of the roller 17 is located substantially equal to or below the bottom surface (transport surface) of the package 1. ing. When folding the front film F 1, the front film holding body 18 is fixedly arranged without any particular moving mechanism, and is held while holding the front film F 1 on the front film holding body 18. By transporting only the package 1, the front portion F 1 of the film F is naturally bent along the bottom surface of the package 1.

Then, in the front film holding body 18, the front film F 1 inserted into the front film holding body 18 by the pushing plate 20 is packed together with the transfer of the package 1. A rotating mechanism 23 for rotating and driving the rollers 17 of the front film sandwiching member 18 is provided so as to be pulled and driven toward the lower side of the object 1. In this case, the rotating mechanism 23 of the front film sandwiching 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 is provided on a predetermined power shaft 25. An endless string belt 27 is stretched between the driving pulley 26 and the driving pulley 26. The power shaft 25 rotates to rotate the drive pulley 26 in accordance with the transfer of the articles to be packaged by the side belt conveyor 12. The rotation of the drive pulley 26 causes the string belt 27 to rotate. The driven pulley part 24 is rotated through the roller, and the roller 17 coaxial with the driven pulley part 24 is rotated, so that the driven pulley part 24 is held between the opposing rollers 17 that are rotationally driven. The folding operation is performed while the front film F 1 is being transported with the predetermined tensile force toward the lower side of the packaged object 1 by a predetermined tensile force due to the frictional force with the surface of the packaged film F 1. Accordingly, the front film F1 is folded along the bottom surface from the front side of the packaged object while applying a stretching force by the tensile force, and the appearance quality is improved without wrinkling of the film F on the surface of the package B. It is possible to form a package B having good quality.

 At this time, the rollers 17 and 17 of the front film holding body 18 are made of, for example, urethane rubber and are made of a material that is difficult to adhere to the film F. The front film F 1 is sandwiched between 7, 17 and is pulled by the frictional force while sliding the front film F 1 downward, so that the front film is coming out of the rollers 17 and 17 at the time of folding. Folding is performed while the front film F 1 is sufficiently stretched while constantly applying tension to the entire F 1.

 On the other hand, when folding the rear film F2, unlike the simple folding of the front film F1, the rear film clamp 19 for folding the rear film F2 is moved in the transfer direction of the packaged object 1. There is a need. In this embodiment, a horizontal moving mechanism 28 for moving the rear film sandwiching body 19 in the transport direction of the package 1 is provided independently of the transport of the package.

The horizontal movement mechanism 28 has a slide shaft 29 provided in parallel with the transport direction of the packaged object 1, and is penetrated by the slide shaft 29 so as to be slidable along the slide shaft 29. The slide body 30 provided is provided, the rear film sandwiching body 19 is attached to the slide body 30, and one end is connected to the slide body 30. The other end is provided with an operating rod 32 that resiliently contacts the peripheral surface of the rotating cam plate 31 and has a central portion as a rotation fulcrum, and rotates as the cutting blade 15 moves up and down. The rear film holding body 19 is provided so as to be movable in the horizontal direction, that is, in parallel with the transfer direction of the packaged object 1, via the operating rod 32 by the cam plate 31 that is moved.

 Specifically, the cutting blade 15 and the pushing plate 20 of the cutter mechanism 6 are lowered, the film F is cut, and the front film F 1 and the rear film F 2 are turned into the front film holding body 18 and the rear film. After being inserted into the film holding body 19 and guided by the front film holding body 18 and the rear film holding body 19, the push-in plate 20 and the cutting blade 15 are raised, and then the rear film holding body 19 is moved. The shape of the cam plate 31 is set so as to move horizontally in the transport direction.

 At this time, the packaged object 1 is in the stopped state, and only the rear film sandwiching body 19 holding the rear film F2 moves in the transport direction of the packaged product 1, so that the rear film F2 is placed on the bottom surface of the packaged product 1. Will be folded along.

 In this case, in the embodiment, the rear film holding member 19 rotates the roller 17 of the rear film holding member 19 with the movement of the rear film holding member 19 by the horizontal movement mechanism 28. A rotation mechanism 33 is provided.

The rotation mechanism 33 of the roller 17 of the rear film holding body 19 is provided with a gear 3 4 provided at the end of the opening 17 of the holding frame 21 on the fixed side, and meshes with the gear 3 4. The rack body 36 is provided on the machine base 35 of the packaging device with a predetermined length substantially in parallel with the transport direction of the packaged object 1. In this way, the gears 34 of the rollers 17 are moved to the rack by the horizontal movement of the rear film holding 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. 36, while rotating, rotating the roller 17 with a predetermined tensile force by the frictional force with the surface of the rear film F2 sandwiched between the rollers 17 that are rotationally driven and opposed to each other. At this time _c, which will be folded is performed while pulling toward the rear fill beam F 2 on the lower side of the packed material 1, roller 1 7, 1 7 of the rear film clamping member 1 9 is the front film sandwiched body 1 Like the rollers 17 and 17, the rear film F2 is made of a material that is difficult to adhere to the film F, such as urethane rubber, and the rear film F2 is rotated by the rollers 17 and 17 that are driven to rotate. 2 and slide the rear film F 2 downward. By pulling with this frictional force while folding, the folding is performed while the rear film F 2 is sufficiently stretched while always applying the extension tension to the entire rear film F 2 that is coming out of the gap between the rollers 17 and 17 at the time of folding. .

 In this way, the rear film F2 can be easily folded, and the rear film F2 is folded along the bottom surface from the rear side of the packaged object while pulling the rear film F2 downward with a predetermined force with a predetermined force. The package B can be formed without wrinkling of the film F on the surface of B.

 Also, with the horizontal movement of the rear film holding body 19, the rollers 17 of the rear film holding body 19 rotate so as to pull the rear part F2 of the film F downwardly of the packaged object 1, so that the horizontal movement is performed. Thus, a single drive source can be used to generate the rotational drive of the roller 17 of the rear film holding member 19, and the structure can be simplified.

 In addition, the rear film holding body 19 is horizontally moved in the transport direction with respect to the packaged object 1 by the horizontal movement mechanism 28 so that the rear film F 2 is bent toward the transport direction side of the packaged object 1 to be folded. Although the folding is performed on the lower surface of 1, the present invention is provided with a release mechanism 37 for releasing the holding of the rear film sandwiching body 19 after the folding operation is completed.

 The release mechanism 37 releases the holding of the rear film F2 by separating a pair of rollers 17 and 17 of the rear film holding body 19 that holds the rear film F2 from each other.

That is, as shown in FIG. 5 and FIG. 6 or FIG. 8 and FIG. 9, the fixed frame roller 17 supported by the holding frame 21 of the rear film sandwiching body 19 is moved by the moving frame. The movable roller 17 supported on the movable frame 22 is rotatably provided at the upper end with a support shaft 38 provided on the movable frame 22 as a base point. The horizontal movement of the rear film sandwiching body 19 to the transport side is completed by providing the fixed receiving member 40 on the machine base 35 side of the packaging device while providing the pressing part 39 integrally from 2 At the moving end position, the pressing portions 39 provided on the moving frames 22 on both sides supporting the movable roller 17 at the moving end position abut against the fixed receiving body 40, thereby moving against the force of the spring S. Moving frame 2 on which frame 2 2 is supported by rollers 17 with support shaft 3 8 as the base point By rotating the upper part of 2 and separating a pair of opposed rollers 17, 17, the sandwiching of the rear film F 2 is released. According to this configuration, the rear film holding body 19 is moved by a predetermined distance in the transport direction by the horizontal moving mechanism 28, and then releases the rear film F2 held by the rear film holding body 19 at the moving end. You.

 The fixed receiving member 40 is made of a screw-like member such as a bolt and is fixed to the machine base 35 with screws, and the position of the tip of the bolt of the fixed receiving member 40 abutting on the pressing portion 39 is adjusted. By doing so, the opening interval between the rollers 17 and 17 of the rear film sandwiching body 19 can be adjusted.

 Hereinafter, the operation of the device of the present invention will be described with reference to the drawings of FIGS. 10 to 16.

 The package 1 is carried in, and the film F conveyed in the same direction as the package 1 is formed into a cylindrical shape and the bottom is sealed. When the film F is conveyed to the position and the film F is transferred between the packages 1, the side belt conveyor 12 stops, and the cutting mechanism 6 operates. At this time, the incoming film F is in a state in which the front film F1 of the front package 1 has already been folded (see FIG. 10).

 When the cutting blade 15 and the pushing plate 20 descend in unison, the cutting blade 15 first comes into contact with the film F, and the film F is cut. The front film F1 and the rear film F2 made of the cut film F are brought into contact with the film, and the front film F1 and the rear film F2 are directed between the rollers 17 and 17 of the front film holding member 18 and the rear film holding member 19. It is guided and pushed in against the pressing force of the spring S. (See Figure 11).

 Thereafter, the cutting blade 15 and the front and rear push plates 20 are raised as a unit, and only the front film F 1 and the rear film F 2 are sandwiched by the front film sandwiching body 18 and the rear film sandwiching body 19. (See Figure 12).

Next, only the rear film sandwiching body 19 moves in the transport direction with respect to the packaged object 1 stopped by the operation of the horizontal movement mechanism 28. At this time, the rotating mechanism 33 provided on the rear film-clamping body 19 moves the rear film-clamping body 19 horizontally. The roller 17 rotates with the movement, and the rear film F 2 is folded along the bottom surface of the package 1 while pulling the rear film F 2 downward (see FIG. 13). In this way, the rear film F 2 can be easily folded, and the rear film F 2 is folded while pulling the rear film F 2 downward with a predetermined force with a predetermined force. Since the folding is performed from the side along the bottom surface, the package B can be formed without wrinkling of the film F on the surface of the package B. Further, after the folding is completed, after moving the rear film holding body 19 by the horizontal movement mechanism 28 by a predetermined distance, the release mechanism 37 moves the rear film holding body 19 to the rear end position at the transport side end position of the rear film holding body 19. When the opposed rollers 17 and 17 of the film holding body 19 are separated from each other, the holding of the rear film F2 is released (see FIG. 14).

 Subsequently, when the side belt conveyor 1 2 is driven to convey the package 1 with the film F, the subsequent package 1 is conveyed while the front film F 1 is sandwiched between the front film clamps 18. Then, the packaged object 1 is conveyed to the fixedly provided front film holding body 18, so that the front film F 1 is naturally folded along the bottom surface of the packaged object 1. At this time, the rollers 17 are rotated by the above-described rotating mechanism 23 provided on the front film sandwiching body 18 along with the transport of the packaged object 1, and the front film F1 is moved below the packaged object 1. Since the folding is performed along the bottom surface of the packaged object 1 while being pulled toward the package 1, the package B can be formed without wrinkling of the film F on the surface of the package B. The front package 1 is transferred to the unloading mechanism 8 as a completed package B in which the front film F 1 and the rear film F 2 are folded. (See Fig. 15 and Fig. 16)

In this case, when the rear film held by the rear film holding body is sometimes slightly longer due to the folded state or the variation in the cutting position, in the packaged object 1 located at the front during the transport. However, at this transport side end position, the rear film F2 is released from the rear film sandwiching body 19 and can be freely pulled out from between the rollers 17 and 17, so that the packaged object 1 The rear film F 2 once folded into the lower surface of the package 1 is not separated from the lower surface of the packaged object 1, and the end of the rear film F 2 can be prevented from being partially turned up, and the rear film F 2 A beautifully finished package can be formed while maintaining a favorable folded state. In the present embodiment, the cutting mechanism 15 is provided by providing a cutting blade 15 and a push plate 20 at the upper part and a receiving plate 16 at a lower position corresponding to the cutting blade 15. However, a receiving plate may be provided at the upper part, 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.

 In addition, the contact force of the rollers 17 of the film sandwiching bodies 18 and 19 is adjusted appropriately by the elastic force of the spring S locked between the holding frame 21 supporting the rollers 17 and the moving frame 22. Can be adjusted by selecting. By doing so, the tensile force of the film F at the time of folding can be adjusted, and for example, the tension of the film F can be adjusted according to the material of the tray T and the type of the contents W to be stored. In other words, when it is desired to form a tight package B by increasing the tensile force of the film F, the elastic force of the spring S is increased and the pressing force of the rollers 17 of the film clamps 18 and 19 is increased. This makes the film F sandwiched between the rollers 17 less slippery and increases the pulling force of the film F to the lower side to perform folding. Conversely, if 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, and the film holding body is reduced. Rollers 17 of 18 and 19 are folded by weakening the pressure contact force between rollers 17 and making the film F sandwiched between rollers 17 slippery and weakening the pulling force of film F to the lower side. is there.

 Further, in this embodiment, both the front part F1 and the rear part F2 of the film F are held by the front and rear film holding bodies 18 and 19, each of which comprises a pair of rollers 17, respectively. An example is shown in which folding is performed while the film F is pulled downward by the lever 17 that is driven to rotate by lever, but one of the front and rear films is folded by the film holding member, and the other is folded. The folding may be performed by another folding method (for example, a conventional chain belt or a suction mechanism). In this case, the pushing plate may be provided only on the front side or the rear side of the cutting mechanism corresponding to the film holding body.

In the present embodiment, when the rear part F2 of the film F is folded, in the state where the conveyance of the packaged object 1 is stopped, only the rear film sandwiching body 19 is horizontally moved in the conveyance direction of the packaged object 1. The rear end F2 of the film F was moved to be folded along the bottom surface of the packaged object 1.However, while the packaged object 1 was being conveyed, the rear film holding body 1 was moved at a speed higher than this conveyance speed. The rear portion F2 of the film F may be folded by moving the package 9 horizontally in the transport direction of the package 1 or temporarily moving the package 1 reversely.

 Further, the driving method of the horizontal moving mechanism 28 is performed by the cam plate 31 and the operating rod 32, but a reciprocating moving mechanism such as a cylinder device may be used.

 The release mechanism 37 of the present embodiment includes a pressing portion 39 provided integrally with the moving frame 22 of the rear film holding member 19 and a fixed receiving member 40 provided on the machine base 35. And the rollers 17 and 17 of the rear film sandwiching body 19 are separated and opened by using the driving force of the horizontal moving mechanism 28. For example, a separate driving means such as a cylinder is provided, and when the rear film sandwiching member 19 comes to the transfer-side terminal end, this driving means is operated to separate the rollers 17 and 17 to open them. You may.

 In addition, the position where the rollers 17 and 17 of the rear film sandwiching body 19 are separated from each other may not be particularly the end position on the transport side, but may be pulled a predetermined distance in the process of moving toward the end side and then close to the end. The roller may be released at a stroke, or the tension of the spring may be loosened in the moving process, and the rollers 17 and 17 may be released little by little to maintain the film tension slightly. , 17 may be opened.

 In addition, the rear film sandwiching body 19 of the present embodiment is shown as being constituted by a pair of rollers 17 and 17. For example, a spring is interposed between two plate-like members to elastically sandwich the same. The rear film F2 may be provided so as to be freely opened, and the rear film F2 is sandwiched between the plate members. Industrial applicability

The present invention is applied to a packaging device for packaging an object to be packaged while stretching a film F made of a stretch film, and can be simplified without providing a large suction mechanism or a chain roller having a complicated structure. Low cost and reliable film This is effective in providing a folding device in a packaging device which enables folding and has a clean surface of the package.

Claims

The scope of the claims 1. A loading mechanism for loading the package, a film feed mechanism for transporting the film drawn from the film roll in the same direction as the package, and a film that guides both edges of the film below the package. A bag-forming mechanism for forming a cylindrical film, a bottom sealing mechanism for overlapping and sealing both edges of the film at the bottom of the packaged object, and cutting the cylindrically formed film between the packaged objects. A cut-off mechanism, a film holding body that is provided before and after the cut-off mechanism, and that includes a pair of rollers each holding a front part and a rear part of a cylindrical film cut by the cut-off mechanism; A push plate provided in front of and behind the cutting mechanism corresponding to the body to insert and guide the front and rear portions of the film into the film holding body; A rotating mechanism that rotationally drives the rollers of the film holding body so as to pull the front and rear portions of the film inserted into the film holding body toward the lower side of the packaged object together with the folding operation of the film. A film folding device in a packaging device, which is provided. 2. A loading mechanism for loading the package, a film feeding mechanism for transporting the film drawn from the film roll in the same direction as the package, and a film that guides both edges of the film below the package. A bag-forming mechanism for forming a cylindrical film, a bottom sealing mechanism for overlapping and sealing both edges of the film at the bottom of the packaged object, and cutting the cylindrically formed film between the packaged objects. A front film nipping mechanism comprising a cutting mechanism and a pair of rollers provided on the front side of the cutting mechanism with respect to the transfer direction of the packaged object and nipping a front part of a cylindrical film cut by the cutting mechanism; A push plate provided on the front side of the cutting mechanism corresponding to the front film holding member, for inserting and guiding the front portion of the film into the front film holding member; and Therefore, the roller of the front film holding body is rotated so as to pull the front part of the film inserted into the front film holding body toward the lower side of the packaged object while transferring the packaged object. A film folding device in a packaging device, comprising a rotating mechanism for driving. 3. A loading mechanism for loading the package, a film feed mechanism for transporting the film drawn from the film roll in the same direction as the package, and a film that guides both edges of the film below the package. A bag-forming mechanism for forming a cylindrical film, a bottom sealing mechanism for overlapping and sealing both edges of the film at the bottom of the packaged object, and cutting the cylindrically formed film between the packaged objects. A cut-off mechanism, and a rear film holding body comprising a pair of rollers provided on the transfer side of the cut-off mechanism with respect to the transfer direction of the packaged object and holding a rear portion of the tubular film cut by the cut-off mechanism. A push plate provided on the transfer side of the cutting mechanism corresponding to the rear film holding body for inserting and guiding a rear portion of the film into the rear film holding body; Therefore, a rotating mechanism for rotating and driving the rollers of the rear film holding body so as to pull the rear portion of the film inserted into the film holding body toward the lower side of the packaged object together with the folding operation of the film. A film folding device in a packaging device characterized by being provided. 4. The film folding device according to claim 3, wherein the rear film sandwiching body is provided with a horizontal moving mechanism that moves in a direction in which the packaged object is transported. 5. The rear film sandwiching body is provided with a rotating mechanism for rotating the roller of the rear film sandwiching body in accordance with the movement of the rear film sandwiching body by the horizontal moving mechanism. A film folding device in the packaging device according to item 4. 6. A loading mechanism for loading the package, a film feeding mechanism for transporting the film drawn from the film roll in the same direction as the package, and a film that guides both edges of the film below the package. A bag-forming mechanism for forming a cylindrical film, a bottom sealing mechanism for overlapping and sealing both edges of the film at the bottom of the packaged object, and cutting the cylindrically formed film between the packaged objects. Cut-off mechanism and transfer of packaged items A rear film sandwiching body provided on the transfer side of the cutting mechanism with respect to a direction and sandwiching a cylindrical rear film cut by the cutting mechanism; and a transfer of the cutting mechanism corresponding to the rear film holding body. A push plate provided on the side and guiding the rear film into the rear film clamp, and the rear film clamped by clamping the rear film inserted into the rear film clamp by the push plate. A horizontal moving mechanism for moving the packaged object in the transfer direction, and an opening mechanism for releasing the rear film holding of the rear film holding body after moving the rear film holding body by a predetermined distance by the horizontal moving mechanism. A film folding device in a packaging device, characterized in that:  7. The film folding device according to claim 6, wherein the rear film sandwiching body comprises a pair of rollers.