KR20000029482A - Film tuck-in device of packaging apparatus - Google Patents

Abstract

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

Description

FILM TUCK-IN DEVICE OF PACKAGING APPARATUS}

Conventionally, while forming the film drawn from the film roll, the film is formed in a cylindrical shape and covered with the packaged object, and both edges of the film are overlapped with each other at the bottom of the packaged object, and the bottom-shaped film is formed between the packages. The cutter is cut by the cutter, and the front film located in front of the package, which is a cylindrical surplus film portion generated outside the cutting by the cutter, and the rear film located behind the package, along the bottom surface of the package. Folding film folding apparatuses are proposed, for example, in Japanese Patent Application Laid-Open No. 1-168403 and Japanese Patent Application Laid-open No. 2-31801.

In this packaging apparatus, the folding apparatus cuts a cylindrical film formed by the cutter between the objects to be packaged, and installs an excess film portion formed from the cylindrical front film and the rear film generated at the time of the cut below the package. The suction film is sucked by a suction mechanism, and the package is conveyed on the lower surface of the package by conveying the package while tensioning in the downward direction of the front film and the rear film. In the front film, the package is transported as it is. The film is folded on the bottom surface in a form naturally following the package, and in the rear film, the film is folded along the bottom of the package while the rear film is wound by a chain roller which rotates at a higher speed than the conveying speed of the package.

As described above, since a large-size suction mechanism is provided for the folding of the excess film in the folding apparatus in the conventional packaging apparatus, the noise problem of the suction mechanism and the problem of unstable suction of the front film and the rear film end are not. have. There is also a problem that the suction roller and the structure of the complex chain roller are too expensive.

In addition, since the front and back film are folded by the tension force of the film by the suction mechanism, the electric field strength of the film is weak, and the film on the surface of the package is wrinkled, or the front and back film are cleanly folded on the lower surface of the package. In particular, in a package formed by this kind of packaging apparatus using a stretch film, the poor appearance of the package causes a decrease in the consumer's desire, and the quality of the quality of the finishing degree of the package is also reduced. Required by the device.

Therefore, the present invention is to provide a folding apparatus in a packaging apparatus with a simple configuration without the installation of a large-scale suction mechanism and a complicated chain roller, and also enables reliable film folding, and the finishing of the package surface is clean. It is aimed.

The present invention forms the film into a cylindrical shape while covering the packaged object by stretching the film drawn out from the film roll by importing the package and covering the packaged object, and the edges of both ends of the film overlap each other at the bottom of the packaged object. A film folding apparatus which seals and cuts a cylindrically formed film with a cutter between the packages, and folds the front and back portions of the cylindrical film cut by the cutter along the bottom surface of the package.

1 is a side view showing the overall configuration of an embodiment of the present invention,

2 is a plan view showing the overall configuration of an embodiment of the present invention,

3 is a perspective view showing a film transfer mechanism of one embodiment of the present invention;

4 is a front view showing a side belt conveyor and a cutter mechanism of one embodiment of the present invention;

5 is a side view showing the main part of an embodiment of the present invention;

6 is a side view showing an essential part of an embodiment of the present invention;

7 is a plan view showing a front film fitting of an embodiment of the present invention,

8 is a plan view showing the rear film fitting of an embodiment of the present invention,

9 is a plan view showing the rear film fitting of an embodiment of the present invention,

10 is a view showing the operation in one embodiment of the present invention,

11 is a view showing the operation in one embodiment of the present invention,

12 is a view showing the operation in one embodiment of the present invention,

13 is a view showing the operation in one embodiment of the present invention,

14 is a view showing the operation in one embodiment of the present invention,

15 is a view showing the operation in one embodiment of the present invention and

16 is a view showing the operation in one embodiment of the present invention.

The present invention is generally a film transfer consisting of two pairs of endless belts for conveying in the same direction as the package while carrying the film taken out from the film roll, and the carrying-in mechanism for loading the packaged material, for example, food trays Mechanisms, a umbilical mechanism for guiding both edges of the film under the package to form a film in a cylindrical shape, and a bottom seal mechanism for sealing both edges of the film at the bottom of the package. And a pair of guillotine-shaped cutter mechanisms for cutting the tubular film between the packages, and a pair of front and rear portions of the cylindrical film cut before and after the cutter mechanism, respectively. A film fitting body consisting of a roller and a front and rear of the cutter mechanism corresponding to the film fitting body; A push plate for inserting and guiding the front and rear portions of the film into a fitting body, and the front and back portions of the film inserted into the film fitting body by the push plate together with the transport of the package. Since the rotary mechanism for rotationally driving the roller of the film fitting body is provided to tension-drive the downward side of the film fitting body, the front and rear portions of the film are predetermined by the rollers of the front and rear film fitting bodies in the downward direction of the package. Since the folding is performed while pulling with the force of, the package can be formed without causing wrinkles of the film on the surface of the package.

In addition, when the rear film is folded, the rear film insert for rear film folding is provided with a horizontal moving mechanism that moves in the conveying direction of the package, so that the rear film can be easily folded. Moreover, in this structure, since the rotating mechanism which rotationally drives the said roller of the said film fitting body was provided so that the excess film part of the back part may be tension-driven toward the downward side of the to-be-packaged object, Since the folding is performed while pulling with a predetermined force, the package can be formed on the surface of the package without causing wrinkles of the film.

At this time, a rack body is provided on the base of the packaging apparatus, and a gear is provided on one roller shaft of the rear film fitting body, whereby the film rear fitting body is formed by the horizontal moving mechanism. Since the gear meshing with the rack body rotates with the movement of the rear film insert and the rotary mechanism for rotating the roller of the rear film insert is installed, the film is fitted with the horizontal movement of the rear film insert. Since the roller of the sieve rotates so that the film of the rear part is tensioned toward the bottom of the packaged object, the rotational drive of the roller of the film fitting body can be caused by a single driving source for horizontal movement, so that the structure can be simplified.

Further, after the rear film fitting is moved a predetermined distance by the horizontal moving mechanism, an opening device for opening the rear of the rear film fitting is opened at the moving end thereof, and after the folding of the rear film is completed, When the back film is folded by opening the back film by the back film insert, the back film can be freely released from the back film insert when the package is transported. Even when the length of the rear part film is sometimes slightly longer due to the irregularity of the folding state and the cutting position, it is possible to prevent the rear film from being peeled off from the lower surface of the packaged object.

Embodiments of the present invention will be described below based on the drawings. 1-16 show one embodiment of the present invention.

The packaging apparatus of the present invention generally comprises a carrying-in mechanism 2 for carrying in a package 1 containing the contents W such as food in a tray T, and a stretch film drawn from the film roll R. The film transfer mechanism 3 which transfers the film F in the same direction as the packaged object 1 while extending the length of the film F, and the edges of both ends of the film F are guided below the packaged object 1 to pass through the film F. Avoid the umbilical mechanism 4 formed in the shape, the bottom sealing mechanism 5 which overlaps and seals the edges of both ends of the film F at the bottom of the package 1, and the film F formed in a tubular shape. Guillotine-shaped cutter mechanism 6 to cut between packages 1, cylindrical front film F1 and rear film F2 provided before and after cutter mechanism 6 and cut by cutter mechanism 6 are produced. ) Is folded along the bottom surface of the packaged object 1, and the packaged object is film-folded and folded. It is composed of a carrying out mechanism 8 for carrying out the completed package (B).

The carrying-in mechanism 2 is provided with the conveyance convex part 10 which can stand and incline at the predetermined | prescribed interval in the endless-shaped chain conveyor 9, and is rotated to drive this chain conveyor 9, and is avoided in order. The package 1 is sent at equal intervals toward the film transfer mechanism 3. When the conveyance convex part 10 is in a standing state, when the conveyance convex part 10 is located in a conveyance surface, it becomes a state which can convey the packaged object 1, and it moves to the conveyance side terminal part of the chain conveyor 9, When it is inverted and located on the opposite side of the conveying surface, it tilts and falls, and continuous rotation drive is performed.

As shown in FIG. 3, the film transfer mechanism 3 includes the packaged object 1 carried in by the loading mechanism 2 while the film F taken out from the film roll R supported on the upper portion of the packaging apparatus is lengthened. This film transfer mechanism 3 is provided with the endless belt body 11 whose both ends are supported by the rotation roll, and this endless belt body 11 Are installed by polymerizing them up and down, and the belt surfaces are placed in contact with each other to be installed to the left and right with respect to the traveling direction of the package 1. This endless belt body 11 is provided inclined downward toward the advancing direction of the package 1. The film F is supported by the right and left endless belt members 11 overlapping each other in the width direction, and is conveyed toward the traveling direction of the packaged object 1, and the upper surface of the packaged object 1 conveyed. Will gradually cover the film (F).

On the conveying direction side of the loading mechanism 2, a side belt conveyor 12 which rotates in the opposite direction and sandwiches the side of the packaged object 1 is conveyed, and at the rear end of the loading mechanism 2, an unloading mechanism ( 8) Just before, conveyance of the packaged object 1 and the cylindrical film F is performed by this side belt conveyor 12.

The umbilical mechanism 4 gradually guides the left and right edges of the film F transferred by the film transfer mechanism 3 toward the center of the bottom portion of the package 1, and carries in the side belt conveyor 12. It consists of a film guide rod 13 attached to the side.

This film guide rod 13 has a vertical part 13A from the carrying side toward the downward side, and it bends to a position slightly lower than the conveying surface of the to-be-packed object 1, and is horizontal part 13B toward the conveying side from the carrying-in side. The film F is formed toward the center with the bottom seal mechanism 5 at both edges of the film opening part of the left and right endless belt body 11 of the film transfer mechanism 3 formed in the shape having the shape and the left and right endless ends. The width is gradually narrowed so as to tighten. 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 by the umbilical device 4 which consists of this film guide rod 13, and the film F Is formed in a cylindrical shape.

The bottom seal mechanism 5 seals the edges of both ends of the film F guided by the umbilical mechanism 4 at the bottom center portion of the package 1, and is a pair of left and right seals arranged in abutment state. It consists of the roll 14. The bottom seal of the film F is performed by sandwiching and conveying the film F in which the both edges of the film F overlapped between these seal rolls 14, The material of the film F is self-compressive In this case, the heater function is not particularly required. However, in some cases, the seal roll 14 may be provided with a heater function to increase adhesion.

The cutter mechanism 6 cuts the film F formed by the bottom sealing mechanism 5 at the bottom portion and formed into a cylindrical shape before and after the packaged object 1, and the packaged object 1 The saw blade-shaped cutting blade 15 is provided above the conveyance surface, and this cutting blade 15 is a guillotine-shaped thing provided so that it could be moved.

In addition, the lower side of the conveying surface of the cutting edge 15 corresponding position is provided by shifting back and forth slightly from the corresponding position of the cutting edge 15, and is a receiving plate which responds to the shanghai dong of the cutting edge 15 and moves up and down. (16) is installed. That is, when cutting, the lower receiving plate 16 is raised in response to the lowering of the cutting blade 15, and when the cutting blade 15 is raised after cutting, the receiving plate 16 is lowered to move back and forth. Doing. By doing so, at the time of cutting, the cutting blade 15 and the receiving plate 16 approach toward the cylindrical film F, and then the cutting blade 15 and the receiving plate 16 overlap each other in the vertical direction. The cylindrical film F positioned in between is cut | disconnected, and it is possible to perform favorable and reliable cutting | disconnection.

The folding mechanism 7 is a front film fitting composed of a pair of rollers 17, respectively, for fitting the front film F1 and the rear film F1, which are excess films generated when cut by the cutter mechanism 6, 18) and the rear film fitting body 19, at the same time, are installed before and after the cutter mechanism 6, corresponding to the front film fitting body 18 and the rear film fitting body 19, and the front film F1. And it is composed of a push plate 20 for guiding the back film (F2).

In addition, in description, the conveyance direction of the to-be-packaged object 1 was carried out in front of the film F1 and the conveyance direction immediately with respect to the cylindrical film F of the packaged object 1 cut | disconnected by the cutter mechanism 6. It shall be defined as the back film F2, and shall be demonstrated as unified in this way below.

The pushing plate 20 is integrally attached to the cutting blade 15 of the cutter mechanism 6, and is a plate-shaped member that hangs in correspondence with the positions of the front film fitting body 18 and the rear film fitting body 19. Is attached at regular intervals before and after the cutting blade 15, and when the film F is cut, it is lowered dynamically with the lowering operation of the cutting blade 15, and the excess film generated by the cutting The front film F1 and the back film F2, which are (F), are inserted and guided toward the film fitting bodies 18 and 19.

The film fitting bodies 18 and 19 of the front part and the back part consist of the same structure, and install a pair of roller 17 in opposition state, fix the shaft center of one roller 17 with the holding frame 21, and the other The shaft center of the side roller 17 is detached from the holding frame, and is supported by the moving frame 22 which is movable, and the holding frame 21 and the moving frame 22 are hung with each other by a spring S. The roller 17 supported by the 22 is attached to the roller 17 of the holding frame 21 in a suppressed state, and the edge part of the front film F1 and the back film F2 is pushed. It is sandwiched between the rollers 17 together with the loading plate 20, and then only the pushing plate 20 exits the rollers 17 with the raising of the cutting edge 15 and the remaining front film between the rollers 17. (F1) and the back film (F2) are sandwiched. The front film fitting body 18 and the rear film fitting body 19 are positioned such that the upper end of the roller 17 is disposed almost equal to, or slightly below, the bottom surface (conveying surface) of the package 1. .

When the front film F1 is folded, the front film fitting body 18 is arranged in a fixed state without installing a moving mechanism, and the front film fitting body 18 is inserted while the front film F1 is sandwiched. The front part F1 of the film F is naturally folded along the bottom surface of the packaged object 1 by conveying only the package 1.

In this front part film fitting body 18, the front part film F1 inserted into the front part film fitting body 18 by the said pushing plate 20 is transported together with the conveyance of the to-be-packed object 1, The rotating mechanism 23 which rotates and drives the roller 17 of the front film fitting body 18 is provided so that it may tension-drive down below 1).

In this case, the rotating mechanism 23 of the front film fitting body 18 is provided with the driven pulley part 24 in the edge part of the roller 17 of the holding frame 21 side which is a fixed side, and predetermined | prescribed, It is comprised across the endless threaded belt 27 between the drive pulleys 26 provided in the power shaft 25. As shown in FIG. The power shaft 25 rotates with the conveyance of the packaged object by the side belt conveyor 12 to rotate the drive pulley 26. As this drive pulley 26 rotates, the actual belt 27 is rotated. The front film F1 surface interposed between the driven pulley portion 24 and the driven pulley portion 24 and the coaxial roller 17, which is sandwiched between the rotationally opposed opposing rollers 17. The folding force is performed while pulling the front film F1 toward the bottom of the package 1 with the transfer of the package 1 with a predetermined tensile force by the frictional force with the frictional force. Therefore, by this tension force, the front film F1 is folded along the bottom surface from the front of the package while exerting the electric field force, and the appearance quality is not caused to wrinkle the film F on the surface of the package B. This good package B can be formed.

At this time, the roller 17 of the front film fitting body 18 is made of a urethane rubber, for example, is made of a material hard to adhere to the film F, and the front film F1 is rotated by a roller ( 17) The entire front film F1 which is pulled out between the rollers 17 when the front film F1 is sandwiched and the front film F1 is slid downward while being pulled by this frictional force to fold. The folding is carried out while sufficiently stretching the front film F1 while always giving the electric force to the film.

On the other hand, when folding the rear film F2, unlike the simple folding of the front film F1, the rear film fitting body 19 for folding the rear film F2 is transferred to the packaged object 1. You need to move it in the direction. In this embodiment, the horizontal moving mechanism 28 for moving the rear film fitting body 19 toward the transport direction of the package 1 is provided independently of the conveyance of the package.

The horizontal moving mechanism 28 is provided with a slide shaft 29 provided in parallel with the conveying direction of the packaged object 1, and penetrates the slide shaft 29 to be slidably moved along the slide shaft 29. The cam plate which installs the installed slide body 30, attaches the said rear film fitting body 19 to this slide body 30, connects one end part to this slide body 30, and rotates the other end part ( 31. An actuating lever 32 is provided by a cam plate 31 which is pressed against the circumferential surface 31 and is provided with an actuating lever 32 having the center portion as a pivot point, and which rotates in conjunction with the raising and lowering operation of the cutting blade 15. Through 32, the rear film fitting body 19 is provided so as to be movable in a horizontal direction, that is, in parallel with the conveying direction of the packaged object 1.

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 F1 and the back film F2 are the front film fitting bodies ( 18) and guided by being inserted into the rear film insert (19) and inserted into the front film insert (18) and the rear film insert (19), and then the rear film insert after the push plate (20) and the cutting blade (15) are raised. The shape of the cam plate 31 is set so that the sieve 19 may move horizontally in a conveyance direction.

At this time, the packaged object 1 is in a stationary state, and only the rear film fitting body 19 in which the rear film F2 is sandwiched is moved in the conveying direction of the packaged object 1 so that the rear film F2 is packed. It is folded along the bottom surface of (1).

In this case, in the embodiment, the rear film fitting body 19 rotates the roller 17 of the rear film fitting body 19 with the movement of the rear film fitting body 19 by the horizontal moving mechanism 28. The rotating mechanism 33 is provided.

The rotary mechanism 33 of the roller 17 of the rear film fitting body 19 is packaged in accordance with the tooth 34 and the gear 34 provided at the end of the roller 17 on the holding frame 21 side on the fixed side. It is comprised by the rack body 36 provided in the base 35 of the apparatus with the predetermined length substantially parallel to the conveyance direction of the to-be-packed object 1. As a result, the gear 34 of the roller 17 is accompanied by the horizontal movement in the conveying direction of the package 1 of the rear film fitting body 19 necessary for the folding operation of the rear portion F2 of the film F. Is rotated while fitting the rack body 36, the roller 17 is rotated and the rear film F2 is subjected to a predetermined tension by frictional force with the surface of the rear film F2 sandwiched between the oppositely arranged rollers 17 which are driven to rotate. Folding is carried out while tensioning (1) toward the bottom of the package (1).

At this time, the roller 17 of the rear film fitting body 19 is made of urethane rubber, for example, like the roller 17 of the front film fitting body 18, and is made of a material that is hard to adhere to the film F. Fold the rear film F2 by tensioning by the frictional force while the rear film F2 is sandwiched by this rotationally driven roller 17 and the rear film F2 is slid downward. The folding is carried out while sufficiently stretching the rear film F2 while always giving the electric field force to the entire rear film F2 exiting between the rollers 17 when the roller 17 is applied.

In this way, the folding of the rear film F2 can be easily performed, and the rear film F2 is folded along the bottom from the back of the package while pulling the rear film F2 with a predetermined force in the downward direction of the package 1. Since is performed, the package B can be formed on the surface of the package B without causing wrinkles of the film F.

In addition, with the horizontal movement of the rear film fitting body 19, the roller 17 of the rear film fitting body 19 rotates so that the rear part F2 of the film F may be tensioned toward the lower side of the packaged object 1. Therefore, the rotational drive of the roller 17 of the rear film fitting body 19 can be caused by a single drive source for horizontal movement, and the structure can be simplified.

Further, the rear film fitting body 19 folds the rear film F2 to the conveying direction of the packaged object 1 by horizontally moving the conveying direction with respect to the packaged object 1 by the horizontal moving mechanism 28. Although folding is carried out on the lower surface of the to-be-packed object 1, in this invention, the release mechanism 37 which opens the clamping of the said back film fitting body 19 after completion | finish of this folding operation is provided.

The release mechanism 37 opens the fitting of the rear film F2 by separating the pair of rollers 17 of the rear film fitting body 19 to which the rear film F2 is to be separated from each other.

That is, as shown in FIG. 5 and FIG. 6 or FIG. 8 and FIG. 9, the movable frame 22 with respect to the roller 17 on the fixed side axially supported by the retaining frame 21 of the rear film fitting body 19 is shown. The upper end is rotatably mounted on the support shaft 38 provided on the movable frame 22 by the shaft 17 of the movable side 22, and the movable frame 22 of the roller 17 on the movable side 17 is rotated. Moving end part which horizontally moves to the conveyance side of the back film fitting body 19 by installing the fixed receiving body 40 on the base 35 side of a packaging apparatus, while providing the press-contacting part 39 integrally. The pressing contact portions 39 respectively provided on the moving frames 22 on both sides supporting the roller 17 on the movable side hit the fixed receiving body 40 to counter the elastic force of the spring S to move the moving frames 22. Rotating the upper part of the movable frame 22 on which the roller 17 is supported starting from this support shaft 38, and separating the pair of rollers 17 which oppose. Into the back of the film (F2) by attaching to the opening. According to this configuration, after the rear film fitting body 19 moves a predetermined distance in the conveying direction by the horizontal moving mechanism 28, the rear film F2 is sandwiched by the rear film fitting body 19 at its moving end. To open.

The fixed receiver 40 is made of a threaded member such as a bolt and screwed to the base 35, and adjusts the position of the bolt tip of the fixed receiver 40 which abuts against the pressing portion 39. The opening interval of the roller 17 of the rear film clamping body 19 is adjusted so that adjustment is possible.

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

The cutter 1 into which the packaged object 1 is carried in, and the film F to be conveyed in the same direction as the packaged object 1 is formed in a cylindrical shape and the bottom seal is placed. When the film F is transported to the position of the mechanism 6 and the film F is transferred 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 in the state in which the front film F1 of the front packaged object 1 was already folded (refer FIG. 10).

When the cutting blade 15 and the pushing plate 20 are lowered dynamically, the cutting blade 15 abuts on the film F first, the film F is cut, and after that, the cutting blade 15 is moved back and forth. The push plate 20 abuts the film, and the front film F1 and the back film F2 made of the cut film F are rollers of the front film insert 18 and the rear film insert 19. It guides toward 17 and is pushed against the pressure contact force of the spring S (refer FIG. 11).

Thereafter, the cutting blade 15 and the front and rear push plate 20 are lifted up dynamically, and only the front film F1 and the rear film F2 are the front film insert 18 and the rear film insert 19 Is left in the state (see Fig. 12).

Next, only the rear film fitting body 19 moves in the conveying direction with respect to the packaged object 1 in a stationary state by the operation of the horizontal moving mechanism 28. At this time, the roller 17 rotates with the horizontal movement of the rear film fitting body 19 by the rotating mechanism 33 provided in the rear film fitting body 19, and the back film F2 is packaged. Folding is performed along the bottom surface of the packaged object 1 while pulling downward (1) (refer FIG. 13).

In this way, the back film F2 can be easily folded and at the same time, the back film F2 is stretched while pulling the back film F2 with a predetermined force in the downward direction of the packaged object 1, so that the back film F2 is carried out. ) Can form the package B without causing wrinkles of the film F on the surface of the package B because folding is performed along the bottom surface at the rear of the package 1.

Moreover, after completion | finish of folding, after moving the back film fitting body 19 by the horizontal movement mechanism 28 a predetermined distance, it is a back part by the release mechanism 37 at the conveyance side end position of the back film fitting body 19. When the roller 17 which opposes the film fitting body 19 spaces apart, the clamping of the back part film F2 is opened (refer FIG. 14).

Subsequently, when the side belt conveyor 12 drives and conveys the to-be-packed object 1 with the film F, the next to-be-packed object 1 is conveyed in the state which inserted the front film F1 in the front film fitting body 18. Then, as shown in FIG. When the package 1 is conveyed with respect to the fixed front film fitting body 18, the front film F1 is naturally folded along the bottom surface of the package 1. At this time, the roller 17 rotates with the conveyance of the packaged object 1 by the rotating mechanism 23 provided in the front film fitting body 18, and the front film F1 of the packaged object 1 is rotated. Since the folding is carried out along the bottom surface of the package 1 while pulling downward, the package B can be formed on the surface of the package B without causing wrinkles of the film F. . Moreover, the front package 1 is conveyed toward the carrying out mechanism 8 as the completed package B by which the front film F1 and the back film F2 were folded. (Refer FIG. 15, FIG. 16).

And at the time of this conveyance, in the to-be-packed object 1 located in front, even if the back part film inserted in the back film fitting body becomes a little longer at some time by the folding state and the irregularity of a cutting position, this conveyance side end position In the back film F2, the back film F2 is open at the back film attaching body 19 and can be freely pulled out between the rollers 17 so that the back film F2 once folded into the bottom surface of the package 1 is avoided. It is possible to prevent the end portion of the rear film F2 from being partially flipped up, without falling off the lower surface of the package 1, and to maintain a good folded state of the rear film, thereby forming a package having a clean finish. .

In addition, in this embodiment, the cutting blade 15 and the pushing plate 20 are provided in the upper part, and the receiving plate 16 is provided in the lower position corresponding to the cutting blade 15, and the cutter mechanism 6 is installed. Although the structure is comprised, a support plate may be provided in the upper part, and a cutting blade may be provided in the lower position corresponding to this support plate position, and the said support plate may be provided in the front-back direction of a cutting blade.

Moreover, the elastic force of the spring S which hung the contact force of the roller 17 of each film fitting body 18 and 19 between the holding frame 21 which supports the roller 17, and the moving frame 22. Can be appropriately selected and adjusted. By doing in this way, the tension | tensile force of the film F at the time of folding can be adjusted, for example, adjusting the pulling degree of the film F according to the material of the tray T and the kind of the content W accommodated. It is also possible. That is, in the case where it is desired to form the tight package body B by strengthening the tensile force of the film F, the elastic force of the spring S is strongly applied to the pressing force between the rollers 17 of the film fitting bodies 18 and 19. It makes it hard to slip the film F sandwiched between the rollers 17, strengthens the pull-in below the film F, and performs folding. On the contrary, in the case where the packaged contents W and the tray T are fragile and fragile, it is necessary to form a soft package B. In this case, the elastic force of the spring S is weakened so that the film fitting body is weak. The pressure of the rollers 17 of the rollers 18 and 19 is weakened to make the film F sandwiched between the rollers 17 slippery to weaken the input force to the bottom of the film F so that the film F is folded. To execute.

In this embodiment, both of the front portion F1 and the rear portion F2 of the film F are sandwiched by the front and rear film fitting bodies 18 and 19, each of which is composed of a pair of rollers 17, and the rotary drive is performed. The example in which the folding is carried out while the film F is pulled down by the roller 17 shown in Fig. 1 is carried out. May be configured to perform folding by another folding method (for example, a conventional chain belt and a suction mechanism). In this case, the push plate may be provided only at the front or the rear of the cutter mechanism in correspondence with the film fitting body.

In addition, when folding the film F back part F2, in this Example, only the back film fitting body 19 is horizontal in the conveyance direction of the to-be-packed object 1 in the state which stopped conveyance of the to-be-packed object 1 in the present Example. It moves and makes the back part F2 of the film F along the bottom surface of the to-be-packed object 1, and performs folding, but conveys the to-be-packed object 1 at a higher speed than this conveyance speed, 19 ) May be horizontally moved in the conveying direction of the package 1, or the package 1 may be temporarily reversed to fold the film F back portion F2.

Moreover, although the drive system of the horizontal movement mechanism 28 is performed by the cam plate 31 and the operation lever 32, you may use a reciprocating movement mechanism, such as a cylinder apparatus.

In addition, the release mechanism 37 of the present embodiment is provided on the pressing contact portion 39 integrally provided in the moving frame 22 of the rear film fitting body 19 and the fixed receiving body 40 provided on the base 35. The roller 17 of the rear film fitting body 19 is opened by using the driving force of the horizontal movement mechanism 28, and it is individual with respect to the rear film fitting body 19, for example, a cylinder. The driving means may be provided so that the driving means is operated when the rear film fitting body 19 comes to the end of the conveying side so as to be spaced apart from the rollers 17 to open.

In addition, the position where the roller 17 of the rear film fitting body 19 spaces apart may not be a conveyance side end position in particular, and may open at once near an edge part after tension-moving a predetermined distance in the movement process near an end side. Alternatively, the roller 17 may be configured to relieve the tension of the spring in the course of the movement, and open the roller 17 little by little by opening the roller 17 little by little.

In addition, the rear film fitting body 19 of the present embodiment was shown by a pair of rollers 17. For example, a spring is interposed between two sheet members and elastically fitted and opened freely. The rear film F2 may be sandwiched between the plate members.

The present invention is particularly applied to a packaging device for wrapping a packaged object while stretching the film (F) made of stretch film, and it is possible to reliably fold the film at a low cost without having to install a large-scale suction mechanism and a chain roller having a complicated structure. It is possible to provide a folding device in a packaging device which enables a clean and finish of the package surface.

Claims (7)

A carrying-in mechanism for carrying a packaged object, a film transfer mechanism for transferring the film taken out of the film roll in the same direction as the packaged object, guides both edges of the film to the lower side of the package, and forms the film in a cylindrical shape A umbilical mechanism, a bottom seal mechanism which overlaps the edges of both ends of the film at the bottom of the packaged object, a cutter mechanism for cutting the cylindrical formed film between the packaged object, and is provided before and after the cutter mechanism A film fitting body consisting of a pair of rollers each sandwiching a front portion and a rear portion of the cylindrical film cut by the cutter mechanism, and installed in front of and behind the cutter mechanism in correspondence with the film fitting body and mounted on the film fitting body. A push plate which guides the front part and the rear part of the part and guides it to the film fitting body by the push plate. The film packaging device, characterized in that the rotating mechanism for rotating the roller of the film fitting to drive the front portion and the rear portion of the film to the lower side of the package with the folding operation of the film. Folding device. A carrying-in mechanism for carrying a packaged object, a film transfer mechanism for transferring the film taken out of the film roll in the same direction as the packaged object, and guiding both edges of the film under the packaged object to form a film in a cylindrical shape; A umbilical mechanism, a bottom sealing mechanism that overlaps the edges of the film at the bottom of the package, and a cutter mechanism for cutting the cylindrical formed film between the packaged object, and the cutter in the conveying direction of the package. A front film insert made up of a pair of rollers installed just before the mechanism and sandwiching the front portion of the cylindrical film cut by the cutter mechanism, and installed just before the cutter mechanism in correspondence with the front film insert and The push plate which guides the front part of the film by inserting it into the front film insert, and the push plate And a rotating mechanism for rotating the roller of the front film insert so that the front portion of the film sandwiched in the front film insert is tension-driven toward the bottom of the package with the transfer of the packaged article. A film fold device, characterized in that the packaging device. An introduction mechanism for carrying the packaged object, a film transfer mechanism for transferring the film taken out of the film roll in the same direction as the packaged object, a umbilical guide for guiding both edges of the film under the packaged object and forming the film in a cylindrical shape A mechanism, a bottom sealing mechanism that overlaps the edges of the film at the bottom of the package, and a cutter mechanism for cutting a cylindrical film between the package, and the cutter mechanism with respect to the transport direction of the package. A rear film fitting body consisting of a pair of rollers mounted on the conveying side of the cutter and sandwiching the rear part of the cylindrical film cut by the cutter mechanism, and installed on the conveying side of the cutter mechanism corresponding to the rear film fitting member By the push plate which guides the back part of the film to a film fitting body, and by the push plate And a rotating mechanism for rotationally driving the roller of the rear film fitting body so that the rear part of the film sandwiched in the film fitting body is tension-driven toward the bottom of the package together with the folding operation of the film. The film folding device in a packaging apparatus. The method of claim 3, wherein The film folding device of the packaging device, characterized in that the rear film fitting is provided with a horizontal moving mechanism for moving in the conveying direction of the package. The method of claim 4, wherein The rear film insert is a film wrapping device, characterized in that the rotating mechanism for rotating the roller of the rear film insert in accordance with the movement of the rear film insert by the horizontal moving mechanism Device. An introduction mechanism for carrying the packaged object, a film transfer mechanism for transferring the film taken out of the film roll in the same direction as the packaged object, a umbilical guide for guiding both edges of the film under the packaged object and forming the film in a cylindrical shape A mechanism, a bottom seal mechanism that overlaps the edges of the film at the bottom of the package, and a cutter mechanism for cutting the cylindrical film between the package, and the cutter mechanism with respect to the transport direction of the package. A rear film fitting body which is installed on the conveying side of the cutter and holds the cylindrical rear film cut by the cutter mechanism, and is installed on the conveying side of the cutter mechanism corresponding to the rear film fitting body, and the rear part is attached to the rear film fitting body. The push plate for inserting and guiding the film, and the push plate to the rear film fitting body. A horizontal moving mechanism for moving the rear film insert in the conveying direction of the package by inserting the inserted rear film, and moving the rear film fitting by a predetermined distance by the horizontal moving mechanism, and then inserting the rear film An apparatus for folding a film according to claim 1, wherein an opening mechanism is provided for opening the catch of said rear film of the sieve. The method of claim 6, The film folding device in the packaging device, characterized in that the rear film fitting body consists of a pair of rollers.