JPH057249B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention relates to packaging objects, especially foodstuffs and other products in trays or other containers, with stretchable plastic films, so-called stretch films. Regarding packaging machines.

[Prior Art] In general, this type of stretch film packaging machine pushes up the packaged product supplied to the pedestal toward the stretch film supplied to the packaging section and stretched. A method has been proposed in which the film is held under tension by being pressed against the film, the film is folded under the object using a folding tool, and then the wrapped object is transported out.

A stationary receiver is installed approximately in the center of the base as a receiver for pushing up the packaged items toward the film that is supplied to the packaging section and stretched, while movable receivers are installed on both sides of the base. The movable receiving pieces are arranged in a line at appropriate intervals to form one row unit, and the movable receiving pieces in row units are arranged in multiple rows inside and outside each side of the base, and the opposite rows are arranged. The movable receiver pieces are arranged in a staggered manner, all the movable receiver pieces are always biased and held in an upright position at approximately the same height as the installed receiver piece, and the movable receiver pieces in each row are placed in the enclosing section. Japanese Patent Publication No. 57-59128 proposed a packaging material that was movably installed on both sides of the base so that the edges of the packaging material could be tilted inward when they came into contact with the bottom of the item with a folding tool. ing.

[Problems to be Solved by the Invention] In the above-mentioned prior art, in order for the movable receiver pieces to operate in a stable state when the folding tool is operated, all the movable receiver pieces are biased and held by a weak biasing force. . For this reason, for example, when a packaged item has a small width and a relatively large height, the bottom can only be supported on a fixed support piece and one row of movable support pieces located on both sides of the fixed support piece. In this case, it is necessary to make the stationary receiver piece narrow so that the folding tool can be inserted as far as possible to the bottom center of the packaged item, and in this case, the placement condition of small packaged items tends to become unstable. Since the stationary receiving piece that supports the small packaged item and the movable receiving piece for one row arranged around this receiving piece are held with a weak biasing force, it is not possible to feed the packaged item to the packaging section position. , and when the packaged item placed on the pedestal is pushed up against the stretched stretch film and pressed against the film, the pressure applied to the packaged item by the tensioned film causes the first row to be The problem is that the movable receiving piece tilts and the item to be packaged is displaced from a predetermined position, making the subsequent film folding operation unstable, resulting in an uncertain packaging form, and resulting in defective packaging.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a packaging machine that can stably supply even small-sized items to a packaging section.

[Means for Solving the Problems] The present invention provides a film supply device that supplies a stretch film to a packaging section position, a placement receiving piece that supports approximately the center of an object to be packaged, and both sides of the placing receiving piece. It has a plurality of rows of retractable receiver pieces that are biased and held in an upright shape and are tiltably provided on one side of the receiver, and the biasing force of the inner foldable receiver adjacent to the above-mentioned receiver is applied. A pedestal elevating device includes a pedestal formed to be stronger than the biasing force of the outer collapsible receiving piece, and the pedestal is movable up and down below the packaging section position; a film folding device that folds a stretch film under the packaged product while the packaged product supplied on the pedestal is lifted up and transferred to a packaging section position; This packaging machine is equipped with a carry-out device for carrying out a packaged article into which a stretch film has been folded by the film folding device.

[Function] When the present invention supplies a packaged article to a packaging section position and wraps the packaged article while pressing it with a stretched stretch film, the present invention provides a loading pedestal and a container adjacent to the loading pedestal. Even when a narrow and small packaged object is placed on a foldable support piece, the foldable support piece adjacent to the placement support piece has a biasing force that can withstand the pressure applied by the film. Since it continues to be held in an upright position, it can be packaged well and stably. Also, large items to be packaged are placed on the placement receiver and multiple rows of foldable receivers for stable packaging. It can be carried out.

[Example] FIGS. 5 and 6 show an overview of the overall configuration of the packaging machine.
A packaged article supply device A is provided with a conveyor 4 for transporting the packaged articles 3 to the lower part of the packaging section 2, which is approximately the middle portion of the packaging section.

At the supply end of the conveyor 4, there is provided a pedestal 5 on which the articles 3 to be packaged are fed and placed by the conveyor 4, and this pedestal 5 is connected to a lift 6 which is moved up and down by a drive unit as appropriate. In addition, a pedestal lifting device B is formed which stretches and holds the stretch film 7 when the pedestal 5 is raised.

A roll body 8 in which the stretch film 7 is wound in a roll shape is rotatably held on the rear side of the main body frame 1, and both ends of the stretch film 7 pulled out from the roll body 8 are held rotatably. A film feeding device C, which is sandwiched between a pair of upper and lower endless belts 9 and transported to the packaging section 2 position, is disposed on both sides of the upper part of the main body frame 1 in the front-rear direction. Stretch film 7 of the endless belt 9
A film cutting device D consisting of a cutter 10 for making perforations in the width direction of the stretch film 7 and film pressers 11 provided on both sides of the cutter 10 is provided at the insertion side end of the stretch film 7.

A rear folding body 12 that reciprocates along the length direction of the film 7 and left and right folding bodies 13 that can be mutually opened and closed along the width direction of the film 7 are provided on the packaging section 2 side of the main body frame 1. A film folding device E is provided on the bottom surface of the packaged object 3 which is cut from the perforation position of the film 7 as the bodies 12 and 13 are moved and pushed up by the pedestal lifting device B.

An unloading device F is provided on the upper side of the main body frame 1, and includes an unloading belt 14 that contacts the top surface of the package 3A and moves forward, and a transfer body 15 on which the package 3A is placed and transferred. .

The packaged items 3, such as trays containing products, are shown in Figure 7A~
As shown in C, the packaged articles are transported by the conveyor 4 of the packaged article supplying device A from the front side of the main body frame 1 to the lower part of the packaging section 2 at an approximately middle portion, and are supplied and placed on the receiving table 5. At the same time as the object to be packaged 3 is transferred, the stretch film 7 is pulled out from the roll body 8 by the film supply device C and is sandwiched between a pair of upper and lower endless belts 9 from the rear side of the main body frame 1 toward the packaging section 2 position. During the transfer, perforations 16 are formed by the cutter 10 of the film cutting device D, and in this way, a series of stretch films 7 with perforations 16 formed as shown in FIGS. 7A to 7C are It is further transported to the packaging section 2 position.

In this manner, as shown in FIG. As shown in Figures D to F, the pedestal 5 is raised by the lift 6 of the pedestal elevating device B, pushes up the stretch film 7 supplied to the packaging section 2 position from below and stretches it, and then connects the rear folding body 12 to the left and right sides. The folding body 13 slides along the bottom surface of the pushed up object 3 to be separated from the perforation 16,
Then, the edges of the stretch film 7 are folded to form a package 3A, and this package 3A is carried to the front side of the main body frame 1 by the carry-out belt 14 and the transfer body 15 as shown in FIGS. 7G and 7H. It will be carried out.

More specifically, in the packaging material supply device A, a tray 18 on which foodstuffs and other products 17 are placed
The object to be packaged 3 is transferred from the front side of the main body frame 1 toward the middle side of the main body frame 1, and while the tray 18 is placed on the fixed plate 19, it is transported by the L-shaped projecting plate 20. It is transferred and pushed out onto the pedestal 5. The projecting plate 20 is attached to a pair of endless chains 4A of the conveyor 4 connected by a chain 22 and a motor 21 with a brake that moves at a preset speed so as to supply the objects 3 to be packaged. The projecting plate 20 is fixedly attached and moves along a guide groove 24 formed in the fixed plate 19. A tray 18 is attached to the fixed plate 19.
The switch 25 and the tray 18 that detect the supply of
Switch 2 for transferring onto the pedestal 5 in steps
5A, and when the tray 18 is not fed, the tray 18 stops, and when the tray 18 is fed, it is transferred to the top of the pedestal 5 in two steps.

In the film supply device C, the main body frame 1
The stretch film 7 pulled out from a roll body 8 rotatably held on the rear side of the main body frame 1 is guided to the upper side of the main body frame 1 by two guide rollers 27 and 28, and is rotatably installed on the main body frame 1. A pair of upper and lower film feeding rubber rollers 2
Guided between 9 and 30. In front of the film feeding rubber rollers 29, 30, a pair of upper and lower endless belts 9 are driven, and film feeding rubber rollers 31, 32 are spaced apart from each other at the same height as the film feeding rubber rollers 29, 30. 1, and a pair of upper and lower rollers 33, 3 for the conveyor 4 are installed on both sides of the front side of the main body frame 1.
4 supports it rotatably. The rubber roller 3
Belt guide parts on both sides of 1 and 32 and the above roller 3
A pair of upper and lower endless belt conveyors 35 and 36 are spanned between the conveyors 3 and 34, respectively. A plurality of shafts 37 that press the upper belt conveyor 35 from above are supported on the side surfaces of the main body frame 1, and a pair of upper and lower endless belt conveyors 35, 36
A plurality of upper and lower rollers 38 for guiding the film feeding traveling sections 35A and 36A are pivotally supported on the side surface of the main body frame 1. A motor 39 with a clutch brake is provided at the bottom of the main body frame 1. The motor 39 is equipped with a clutch brake for determining the length of film feed by using a clutch by counting the sine waveform of a pulse generator (not shown) attached to the rear of the motor. Drive gear 40 and the film feeding rubber roller 2
A timing belt 45 connects gears 41 and 42 provided coaxially to the rollers 9 and 30 and gears 43 and 44 provided coaxially to the rubber rollers 31 and 32 for driving the conveyor 4 and feeding the film. 45 is the upper gear 41, 43
The drive gear 40 is sequentially connected to the outside of the drive gear 40, the inside of the lower gears 42 and 44, and the drive gear 40. The motor 39 rotates intermittently at the film feed length pitch set in advance by adjusting the pulse generator. Film feeding rubber rollers 29, 30 and conveyor drive, film feeding rubber roller 3
1 and 32 rotate, and the endless belt 9 is driven. For this reason, the series of stretch films 7 pulled out from the roll body 8 remain in a continuous state until they reach the guide roller 2.
A pair of upper and lower rubber rollers 2 are guided by 7 and 28.
9 and 30 and between rubber rollers 31 and 32, both ends of the stretch film 7 are sandwiched between film feeding running portions 35A and 36A of a pair of upper and lower endless belt conveyors 35 and 36, and are intermittently fed. to be transported.

In the pedestal lifting device B, a pedestal 5 is arranged below the packaging section 2 of the main body frame 1, and the pedestal 5
A guide rod 46 vertically disposed is supported by a bearing 47 fixed to the main body frame 1 so as to be able to move up and down, and the drive shaft of a motor 48 and the pedestal 5 are connected via a crank 49. Driven by the motor 48, the cradle 5 moves up and down while being guided by the guide rod 46 via the crank 49. When the article 3 to be packaged is supplied and placed on the pedestal 5 and the pedestal 5 is pushed up by the drive of the motor 48, the stretch film 7 supplied to the packaging section 2 is tensed and expanded. The pedestal 5 is formed by a central placement receiving piece 50 and multiple rows of retractable receiving pieces 50A, 50B arranged on the left and right sides of this placing receiving piece 50. It is pivotably supported so as to be rotatable toward the user, and is always biased and held in an upright position to form a placement section for the packaged object 3.

In the film folding device E, the base ends of the pair of left and right folding bodies 13 are attached to a pivot 53 on the lower surface side of a fixed plate 52 installed on the main body frame 1 on the rear side of the packaging section 2 position.
Rails 54 are provided in the front-rear direction on both sides of the main body frame 1 at the packaging section 2 position, and a moving body 55 is provided on each of the rails 54. Both ends of the rear folding body 12 are fixed, and a guide groove 56 is formed in the left and right folding body 13 with the base side curved inward in the length direction. Guide roller 57
When the rear folding body 12 enters and the rear folding body 12 operates, the rear folding body 12 and the left and right folding bodies 13 move forward and close in synchronization with each other, so that the object 3 on the holder 5 is moved rearward and on both sides. They are formed so as to perform a so-called three-way folding action in conjunction with each other. Furthermore, a torque motor 58 is provided below the main body frame 1, and the movable body 55 is connected to the drive shaft of the torque motor 58 via a crank 59. is pressed against the stretch film 7 supplied to the packaging section 2 position, the rear folding body 12 is moved to the moving body 5 via the crank 59 by the drive of the torque motor 58.
5. Move forward guided by the rails 54. As the rear folding body 12 moves, the stretch film 7 is separated from the perforation 16, and the left and right folding bodies 13 are rotated toward the center around the pivot 53 and pushed up while being guided by the guide grooves 56 and guide rollers 57. The stretch film 7 is slid along the bottom surface of the wrapped object 3, and the edges of the stretch film 7 are folded in from three sides to form a package 3A. In this case, the plurality of collapsible receiving pieces 50A and 50B forming the pedestal 5 are pressed by the left and right folding bodies 13 and rotate toward the center, thereby allowing the folding bodies 12 and 13 to move.

In the film fixing device G, a receiving rod 61 is installed on the main body frame 1 at a position slightly above the stretch film 7 on the front end side of the film feeding running sections 35A and 36A. A fixing plate 62 to which rubber or the like is attached is disposed below the stretch film 7 to clamp and fix the tip side of the stretch film 7. One end of a link 64 is fixed to the pivot shaft 63, and the other end of the link 64 is connected to a torque motor 65.
The drive shaft is connected via a link 66, an engagement groove 67, and an engagement roller 68 provided on the drive shaft. Then, when the link 66 is rotated by the drive of the torque motor 65, the link 64 rotates through the engagement roller 68 and the engagement groove 67, and the pivot shaft 63 is rotated. rotates to clamp and fix the front end of the stretch film 7 to the receiving rod 61.

In the unloading device F, the unloading belt 14 is disposed at a rising standby position for the packaged object 3 placed on the pedestal 5,
The package 3A with the film 7 folded on three sides by the folding bodies 12 and 13 is transferred by the carry-out belt 14 onto the transfer body 15 which has a built-in heat sealer 69, and during this transfer, the front end of the film 7 is placed on the tray. 18 , and then sealed by this transport body 15 and sent out by a delivery belt 70 .

Therefore, when the tray 18 carrying the products 17 is fed manually or automatically onto the fixing plate 19, the switch 25 is turned on, thereby operating the conveyor 4 and fixing it to the endless chain 4A of the conveyor 4. The projecting plate 20 pushes the tray 18, and the tray 18 is slid onto the fixing plate 19 and transferred toward the lower position of the packaging section 2. Simultaneously with the operation of the conveyor 4, the pair of rubber rollers 29 and 30 for feeding the film and the conveyor 4 are operated at a preset feed amount by adjusting the pulse generator, and the stretch film 7 is pulled out from the roll body 8 in one step. Sent. Here, a pair of rubber rollers 29 and 30 for film feeding are provided.
The cutter 10 cuts into the stretch film 7 which is stretched between the rubber rollers 31 and 32 for driving the endless belt 9 and feeding the film to form perforation 1.
6 is formed. Next, the rubber rollers 29, 3
0 and the endless belt 9 actuate the series of stretch films 7 in which the perforations 16 are formed.
The stretch film 7 is fed to the packaging section 2 position by step transfer. In this case, the stretch film 7 is sandwiched between the pair of rubber rollers 29, 30 and 31, 32, and its both side edges are sandwiched between the film feeding running portions 35A, 36A of the pair of upper and lower endless belt conveyors 35, 36. It is supplied to the packaging section 2 position in a state in which it is packed. After that, packaged item 3
is transferred from the end of the conveyor 4 onto the pedestal 5.

At the same time that the packaged object 3 is placed on the pedestal 5 in this manner, the fixing plate 62 rotates around the pivot 63 and clamps and fixes the tip side of the stretch film 7 between it and the holder 61. At the same time, the lift 6 operates, and the pedestal 5 is guided by the guide rod 46 and rises, pushing up the stretch film 7 supplied to the packaging section 2 from the lower side to stretch the stretch film 7, and then the rear folding body 12 is opened. The stretch film 7 is separated from the perforation 16 by moving forward guided by the rail 54, and in conjunction with this rear folding body 12, the left and right folding bodies 13 form the folding receiving piece 5 which forms a mounting part for the receiving base 5.
0A and 50B rotate toward the center while tilting toward the center, and the stretch film 7 is folded into the bottom of the tray 18 from three sides, so that the package 3A is placed on the rear folding body 13. After that, pedestal 5
At the same time as the stretch film 7 is lowered, the fixing plate 62 that fixes the front end side of the stretch film 7 also returns to release the fixation. At the same time, the upper surface side of the package 3A is
The lower surface side is transferred by the unloading roller 71 to the package 3A.
is transferred onto the carry-out belt 15. As a result, the packaging film 7 on the front side of the tray 18 is also attached to the tray 18.
The unloading belt 15 is folded into the lower side of the
It is sealed by heat from a heat sealer 69 at the top, and then transported out by a delivery belt 70. Thereafter, the folded bodies 12 and 13 return to their original positions.

In the packaging machine configured in this way, the pedestal 5
As shown in FIGS. 1 to 3, the guide rod 46
A substantially L-shaped mounting plate 50 is fixed to the center of a receiving plate 72 horizontally fixed to the upper end with screws 51, and a pair of collapsible receiving pieces 50A are provided on both left and right sides of the mounting plate 50. It is pivoted adjacent to and parallel to the mounting piece 50. This collapsible receiving piece 50A has both ends connected to the front and rear leg rods 73 fixed to the receiving plate 72 with pivots 74.
The collapsible receiving piece 50A is urged by a spring 75 so as to rotate outward, and is supported by a stopper 7 protruding from the leg rod 73.
6 and held in an upright state at approximately the same height as the mounting receiving piece 50. Further, a pair of collapsible receiving pieces 50B are further pivoted in parallel on both left and right sides of the collapsible receiving piece 50A. Like the collapsible receiver piece 50A, the collapsible receiver piece 50B is pivotally supported at both ends of the leg rod 73 by a pivot 74, and is urged by a spring 77 to rotate outwardly. 73
The placement receiving piece 5 is engaged with a stopper 76 protruding from the
It is held in an upright state at almost the same height as 0.
In this case, the spring 7 that biases the foldable support piece 50A
5 is strong enough to prevent it from tilting due to the pressing force when the object to be packaged 3 is pressed against the stretch film 7 as the pedestal 5 rises, and the collapsible holder 5
The spring 77 that biases 0B has a relatively weak biasing force that allows it to be easily tilted when folding the film. Further, a receiving plate 78 with which the left and right folding bodies 13 engage is attached to the outer surface of each of the collapsible receiving pieces 50A, 50B.

A small-sized cover with a small width and a relatively high height is supported only by the mounting receiving piece 50 and the collapsible receiving piece 50A disposed adjacent to the mounting receiving piece 50. When the package 3 is fed to the packaging section 2 position by the rise of the pedestal 5 and is pressed against the stretched stretch film 7, the placement receiving piece 50 is fixed to the receiving plate 72 and The pair of retractable receiving pieces 50A arranged adjacent to the placing receiving piece 50 are kept biased in an upright state by the spring 75 with a strength capable of withstanding the pressing force of the film 7, so that they are small and relatively inexpensive. Stable objects 3 to be packaged can be stably supplied to the packaging section 2 position. Moreover, since the foldable receiver pieces 50B located outside of the foldable receiver pieces 50A arranged adjacent to the placement receiver pieces 50 are biased by a relatively weak spring 77, the left and right folding bodies 13 The foldable receiving piece 50B located on the outside during the folding operation.
is easily tilted and folded smoothly, and the foldable receiving piece 50A adjacent to the placement receiving piece 50 is also inclined at the final stage of the left and right folding bodies 13, so even if the packaged object 3 is small, the bottom part It can be folded well to the center. In this case, since the angle of inclination of the foldable receiver piece 50A adjacent to the placement receiver piece 50 may be small, even if the biasing force of the spring 75 of the foldable receiver piece 50A is relatively strong, the film folding operation can be performed well. It will be done. Moreover, the large-sized object 3 can be placed on the receiving piece 5.
0 and a plurality of rows of foldable receiving pieces 50B, stable packaging can be performed.

Note that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the gist of the present invention. For example, in the configuration of the pedestal, the shape, fixing, pivoting, and biasing means of each receiving piece may be appropriately selected within the scope of the gist, and coil springs, leaf springs, etc. may be used instead of springs, and relatively weak force may be used. Although one pair of supported collapsible receiving pieces is shown, two or more pairs may be used.

Furthermore, in the above-described embodiment, a plurality of rows of foldable receivers are arranged on both sides of the mounting receiver, that is, in the width direction of the film. It is also possible to install an invertable support piece and fold the rear end side of the film into the bottom of the packaged object while tilting the invertable support piece using the rear folding body.

Further, although the mounting receiving piece is shown as being fixed with screws, it may be biased and held by a strong spring or the like. In addition, as the overall configuration of the packaging machine,
A device that clamps and feeds the film like No. 35578, or Utility Model No. 47992 (1983), and Special Publication No. 56 (1983).
Of course, it can be applied to the film folding device of No. 34484.

[Effects of the Invention] The present invention includes a film supply device that supplies a stretch film to a packaging section position, a placement receiving piece that supports approximately the center of an object to be packaged, and a device that is biased in an upright manner on both sides of the placement receiving piece. It has a plurality of rows of retractable receivers that are held and tiltably provided on one side of the receiver, and the biasing force of the inner retractable receiver adjacent to the above-mentioned receiver is transferred to the outer retractable receiver. A pedestal elevating device includes a pedestal formed to be stronger than the biasing force of the piece, and the pedestal is movable up and down below the packaging section position; a package supply device; a film folding device for folding a stretch film under the packaged article after the packaged article fed onto the pedestal is lifted up and transferred to a packaging section position; and the film folding device The device is equipped with an unloading device for unpacking the packaged item with the stretch film folded in, and a narrow and small container placed on a loading pedestal and a collapsible holder adjacent to the loading pedestal. Even for items to be packaged, the foldable receiving piece adjacent to the placing receiving piece continues to be held in an upright position by a biasing force that can withstand the pressure applied by the film, so that it can be packaged well and stably. Furthermore, it is possible to provide a packaging machine that can stably package a large-sized object by placing it on the placement receiving piece and the plurality of rows of foldable receiving pieces.

[Brief explanation of the drawing]

1 to 8 show one embodiment of the present invention, and FIG. 1 is a partially cutaway front view of the pedestal, and FIG.
The figure is the same plan view, Figure 3 is the same side view, Figure 4 A,
B and C are cross-sectional views showing the operating state, Figure 5 is a longitudinal cross-sectional view of the entire packaging machine, Figure 6 is a plan view of the same, and Figures 7A,
B, C, D, E, F, G, H and Figure 8 A, B,
C is an operational state diagram showing a packaged state. 2... Packaging department, 3... Item to be packaged, 5... cradle,
50, 50A, 50B...Socket piece, 75, 77...
Spring, A...Packaged object supply device, B...Pedestal lifting device, C...Film supply device, D...Film cutting device, E...Film folding device, F...
...Unloading device, G...Film fixing device.

Claims (1)

[Claims] 1. A film supply device that supplies the stretch film to the packaging section position, a placement receiving piece that supports approximately the center of the object to be packaged, and a holding piece that is biased and held in an upright position by both sides of the placement receiving piece; It has a plurality of rows of retractable receiving pieces that are tiltably provided on the receiving side, and the urging force of the inner retractable receiving piece adjacent to the above-mentioned placement receiving piece is made stronger than the urging force of the outer retractable receiving piece. a pedestal elevating device comprising a pedestal formed of a pedestal, the pedestal being movable up and down below the packaging unit position; A film folding device folds the stretch film onto the underside of the packaged article while the packaged article is lifted up onto a pedestal and transferred to the packaging section position, and the stretch film is folded by this film folding device. 1. A packaging machine comprising: a transport device for transporting a packaged article;