JPH0454892Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to wrapping objects to be packaged, particularly foodstuffs and other products in trays or other containers, using stretchable plastic films such as polyvinylidene chloride. This article relates to a packaging machine that uses Tsuchifilm for packaging.

[Prior Art] Generally, a wrapping machine using a stretch film is used, for example, by pushing up a packaged product supplied to a pedestal toward a film that is supplied to a packaging section and stretched. A method has been proposed in which the film is pressed and held under tension, the film is folded under the rear and right and left sides of the object using a folding tool, and the wrapped package is then transported out.

By the way, in this kind of packaging machine,
As proposed in Publication No. 15192, an endless delivery belt is disposed above the pushing up of the packaged material, and this delivery belt is operated to feed the film in contact with the top surface of the package. A carrying-out device is provided that folds the surrounding front edge while carrying out the carrying-out device. This unloading device must not apply an excessive load to the package, so when the package is large, it is pushed up against the package, floats up, and applies its own weight as a pressing force. .

[Problem to be solved by the invention] In the above-mentioned conventional technology, the carrying-out belt is configured to abut against the upper part of the package and carry out the package while applying a load. It is attached and fixed in position in the front and back, and when carrying out, a part of the carry-out belt, for example, the front end side, applies a load to the package while the carry-out belt rotates and carries out the package. As the carry-out belt moves forward, the abutment position of the carry-out belt moves relatively to the rear of the package, so that the film portion folded into the rear lower side of the package by the folding tool comes into pressure contact with the carry-out belt. The load causes friction between the folding tool and the folding tool, which applies force in the opposite direction to the folding direction to the folded or film portion on the lower rear side of the package and causes it to return, forming wrinkles. This poses the problem of significantly lowering the product value.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a packaging machine that can prevent wrinkles from being formed in the film portion that is folded into the rear lower side of the package during transport.

[Means for Solving the Problems] The present invention provides a film feeding device that feeds a stretch film to a packaging section position, and a film feeding device that feeds a packaged object containing an object stored in a tray to the packaging section position. a feeding device; a film folding device for folding the rear side and width direction of the stretch film onto the underside of the packaged object supplied to the packaging position by the packaged article feeding device; and a film folding device for folding the film into the packaged object from three sides. It has a reciprocating unloading body that abuts against the top surface of the package and transports the package forward in the abutting state, and by forward movement, the front side of the film is folded into the bottom of the package, and the above-mentioned The packaging machine has an unloading device in which the unloading body is formed with a contact portion that comes into contact with at least the front side of the packaging body during the forward transport.

[Function] With the above configuration, the carrying-out body transfers the package forward with its abutting part in contact with the front side of the package, and the rear side of the package receives a local pressure load from the carrying-out body. Things will disappear.

[Example] FIGS. 4 and 5 show an overview of the overall configuration of a stretch film wrapping machine. On the front side of the main body frame 1, there is a lower part of the wrapping section 2, which is approximately in the middle of the main body frame 1. A packaged article supply device A is provided which includes a conveyor 4 for transporting the packaged articles 3 up to the point where the packaged articles 3 are transported.

At the supply end of the conveyor 4, there is disposed 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 driven up and down as appropriate. , and forms a pedestal lifting device B that stretches and holds the stretch film 7 when the pedestal 5 is raised.

A roll body 8 in which a stretch film 7 is wound in a roll shape is rotatably held on the rear side of the main body frame 1. A film feeding device C, which is inserted into the endless belt 9 and transported to the packaging section 2 position, is arranged on both sides of the upper part of the main body frame 1 in the front-rear direction. At the end of the endless belt 9 on the side where the stretch film 7 is inserted, there is a film cutting device D consisting of a cutter 10 for perforating the film 7 in the width direction, and a film presser 11 provided on both sides of the cutter. It is provided.

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 move and is 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 a reciprocating unloading body 14 that moves while pressing against the upper surface of the package 3A, and a transfer body 15 on which the package 3A is placed and transferred. It is being

The packaged items 3 such as trays containing products are shown in Figure 6A,
As shown in FIG. 1B, the conveyor 4 of the packaged article supply device A transports the packaged articles 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 supplies the packaged articles to the pedestal 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 thus a series of packaging films 7 with perforations 16 formed as shown in FIGS. 6A and 6B are It is further transported to the packaging section 2 position.

In this way, as shown in FIG. 6B, the article to be packaged 3 is supplied onto the pedestal 5, and a series of stretch films 7 with perforations 16 are supplied to the packaging section 2. As shown in Figure C, the cradle 5 is raised by the lift 6 of the pedestal lifting device B, and the packaging section 2
The film 7 supplied to the position is pushed up from below and stretched, and then the rear folding body 12 and the left and right folding bodies 13 slide along the bottom surface of the pushed up object 3 to be packaged and are separated from the perforation 16, and The edges of the film 7 are folded to form a package 3A, and this package 3A is carried out by a carry-out body 14 and a transport body 15 as shown in FIG. 6D.

Further, in the unloading device F, the unloading body 14 is disposed at a rising standby position for the packaged object 3 placed on the pedestal 5, and the package 3A with the film 7 folded on three sides by the folding bodies 12 and 13 is transported into the unloading unit. 14 onto a transfer body 15 containing a heat sealer 17, and during this transfer, the front edge of the film 7 is folded under the tray 18, and then this transfer body 15
After being sealed, it is sent out by a delivery belt 19. In this case, as shown in FIGS. 7 to 9, a frame 22 formed by connecting a pair of left and right rails 20 by horizontal rods 21 in the longitudinal direction of the film is attached to the main body frame by a pivot 23.
A base plate 24 is mounted on the left and right rails 20 and has a soft pressure member 24A, such as a sponge, constituting the unloading body 14 fixed thereon, so as to be movable back and forth. The frame 22 is provided with a motor, the drive shaft 26 of the motor 25 is provided with a pinion 27, and the frame 22 is provided with a rack 28 that can engage the pinion 27 and move back and forth. The above-mentioned substrate 24 is connected. Then, the delivery body 14 and the delivery belt 19 operate to press the upper surface side of the package 3A with its own weight, and the delivery body 14 reciprocates along the rail 20 via the rack 28 and pinion 27 to form the package. 3A is transferred onto the transfer body 15.
As a result, the packaging film 7 on the front side of the tray 18 is also folded into the lower surface of the tray 18, and is sealed on the transfer body 15 by the heat of the heat sealer 17, and is sent out by the delivery belt 19. On the other hand, as an example of the operation of the rear folding body 12 and the left and right folding bodies 13, as shown in this embodiment, a fixing plate 29 installed on the main body frame 1 on the rear side of the packaging section 2 position in the film folding device E is used.
The base ends of the pair of left and right folding bodies 13 are attached to the lower surface side of the pivot 3
Rails 31 are provided in the front and back direction on both sides of the main body frame 1 at the packaging section 2 position, and each of the rails 31 is provided with a movable body 32, and this movable body 32
Both ends of the rear folding body 12 are fixed to the left and right folding bodies 13, and a guide groove 33 whose base side is curved inward in the length direction is formed in the left and right folding body 13.
The guide roller 34 provided on the rear folding body 12 engages, and as 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, thereby opening the cradle 5. Top packaged item 3
It is formed so as to perform a so-called three-way folding action in which the rear and both sides are interlocked with each other.

Furthermore, the rear folding body 1 is attached to one side of the rear folding body 12.
A cam 35 facing in the direction of movement of the carrier 2 is provided so that its position can be adjusted freely by a guide groove 36 and a set screw 37, and an arm 38 is attached to the frame 22 of the carry-out device provided with the carry-out body 14. A roller 39 is provided which runs on the cam 35 and operates. The above cam 35 and roller 3
9 constitute a lift mechanism 40.

The cam 35 has one cam surface 35A that holds the carry-out body 14 at an upper position separated from the packaging body 3A before the carry-out operation of the rear folding body 12, that is, during the folding operation.
and the other cam surface 35B which is brought into contact with the packaging body 3A by lowering the carrying body 14 at or slightly before carrying out. As the rear folding body 12 operates, the film 7 is folded by the mutually synchronized three-way folding action of the rear folding body 12 and the left and right folding bodies 13. At this time, as the rear folding body 12 moves, the film 7 is folded. The cam 35 also moves together, but since the roller 39 continues to engage with one cam surface 35A of the cam 35, the delivery body 14 remains separated from the packaging body 3A, and the rear folding body 12 is finally moved. At or slightly before reaching the cam 3, the roller 39
5, the delivery body 1 engages with the other cam surface 35B of the
4 descends and comes into contact with the top surface of the package 3A, and the unloading body 14
It is carried out by the operation of. Also, the rear folding body 12
As the motor 25 returns backward, the motor 25 rotates in the opposite direction, and the delivery body 14 returns via the rail 20. In that case, the piston 41A is pivotally supported on the main body frame 1 side, the cylinder 41 is pivotally supported on the frame 22,
An adjustment member 42 consisting of a cylinder 41 and a piston 41A applies a resistance force to suppress vertical vibration of the frame 22. By adjusting the position of the cam 35 using the groove 36 and the set screw 37, the roller 39 moves from one cam surface 35A to the other cam surface 35B, and the delivery object 14 moves to the packaging object 3A.
It is possible to adjust the time of contact with the top surface of.

In the above embodiment, the cam 35 was provided on the rear folding body 12 side, and the roller 39 was provided on the carrying-out body 14 side.
A cam 35 may be provided on the side, and although a cam mechanism is shown as the lift mechanism, it may be configured so that the delivery body 14 is pressed against the packaging body 3A and conveyed by the operation of a cylinder.

In the packaging machine configured in this way, the delivery body 14 is connected to the substrate 2 as shown in FIGS. 1 and 2 A and B.
4, a soft pressure member 24A having a triangular side surface is removably fixed to the front side with a thick wall on the front side and a thin wall on the rear side. In this case, the front thick portion of the soft pressure member 24A is used as the contact portion 14A. Then, when the carry-out body 14 descends when the movement of the rear folding body 12 reaches its final stage or a little before that, the abutment portion 14, which is the front thick part of the soft pressure member 24A having a triangular side surface,
A is pressed against the front upper surface of the package 3A, and the rear part of the package 3A is slightly raised, and the package 3A is transferred to the transfer body 15 by the operation of the carry-out body 14.
For this reason, when carrying out the carry-out body 14 by pressure contact, it is difficult to apply a pressure load to the rear side of the package 3A, and therefore, the film portion 7A folded into the rear lower side of the package 3A is folded into the rear part. Since there is no friction between the film portion 12 and the body 12, and the film portion 7A is not pulled back in the direction opposite to the folding direction, wrinkles can be prevented. In this case, a pressing load is applied to the front part of the package 3A, but since the folding direction of the film portion 7A folded into the lower front part of the package 3A and the unloading direction of the package 3A are the same direction, the press contact is applied during unloading. The film portion 7A folded into the lower front side of the package 3A by
There is no need to worry about wrinkles forming.

3A, B, and C show embodiments of the present invention, and in FIG. 3A, the delivery body 14 is a substrate 24
A soft pressure member 24A having a rectangular side surface shape is fixed to the front side of the soft pressure member 24A. In this case, the soft pressure member 24A
is defined as the contact portion 14A. And the unloading body 14
is lowered and the soft pressure member 24A, which is the contact portion 14A, comes into pressure contact with the front upper surface of the packaging body 3A, and the package is removed by the operation of the unloading body 14 without applying a large load to the rear part of the packaging body 3A. Body 3A is transport body 15
will be transferred to. For this reason, when carrying out by press-contacting the carrying-out body 14, it becomes difficult to apply pressure load to the rear side of the package 3A.
The film portion 7A folded to the rear lower side of A does not cause friction with the rear folding body 12,
Formation of wrinkles on the film portion 7A can be prevented.

In FIG. 3B, the delivery body 14 is configured with a soft pressure member 24A having a rectangular portion consisting of a thick wall portion on the front side and a rectangular portion consisting of a thick wall portion on the rear side. This is referred to as a contact portion 14A. Also, Figure 3C
The carrying body 1 is equipped with a soft pressure member 24A having a thick wall on the front side and a thin wall on the rear side to form a curved surface.
4, and the thick part on the front side serves as an abutment part 14A. Also in FIGS. 3B and 3C, the same actions and effects as in the above embodiment can be obtained.

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, the soft pressure member may be one that presses against the rear side of the package so as to reduce the load applied to the rear side of the package.

[Effects of the invention] The present invention includes a film supply device that supplies a stretch film to a packaging section position, a packaged article supply device that supplies a packaged article containing items stored in a tray to the packaging section position, and A film folding device that folds the rear side and the width direction of the stretch film onto the underside of the packaged item supplied to the packaging position by the packaged item supply device, and the top surface of the package in which the film is folded into the packaged item from three sides. It has a reciprocating unloading body that abuts on the body and transports the package forward in the abutting state, and the front side of the film is folded under the packaging body by the forward movement, and the unloading body has the and an unloading device having an abutting part formed on at least the front side of the package to be in contact during the forward transport, to prevent wrinkles from being formed in the film portion folded to the rear lower side of the packaged item during unloading. It is possible to provide a packaging machine that allows preventive measures.

[Brief explanation of the drawing]

1 to 9 show an embodiment of the present invention.
Fig. 1 is a perspective view, Fig. 2A and Fig. 2B are cross-sectional views showing the contact state between the discharge body and the package, Fig. 3A, B and Fig. 3C are perspective views showing an embodiment of the present invention, Fig. 4 is a vertical cross-sectional view of the entire packaging machine, Fig. 5 is a plan view of the same, Fig. 6A, B, C and D are operation diagrams showing the packaging state, Fig. 7 is a plan view of the main part, Fig. 8 is a side view and Fig. 9 is a cross-sectional view. 2...packaging section, 3...packaged item, 3A...packaged body, 7...stretch film, 14...discharge body, 14A...contact section, A, B...packaged item supply device, C...film supply device, E...film folding device, F...discharge device.

Claims (1)

[Scope of utility model registration request] A film supply device that supplies a stretch film to a packaging section position; a packaged article supply device that supplies a packaged article containing items stored in a tray to the packaging section position; A film folding device that folds the rear side and the width direction of the stretch film into the lower side of an object supplied to the object to be packaged; The transporting body has a reciprocating transporting body that transports the package forward, and the front side of the film is folded into the lower side of the packaging by the forward transport. 1. A packaging machine comprising: a carrying-out device formed with a contact portion that contacts during transfer.