JPH0311963B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention provides packaging materials, particularly foodstuffs and other products contained in trays or other containers, by means of a stretchable plastic film, such as polypinylidene chloride, so-called stretch material. This invention relates to an unloading device for a packaging machine that wraps with Tsuchifilm.

[Related technologies and their problems]

In general, a packaging machine using stretch film is used to press the packaged item against the film by pushing up the packaged item supplied to the pedestal toward the film that is supplied to the packaging section and stretched, thereby keeping the film in a tensioned state. It has been proposed to wrap the film by folding the film under the packaged object using a folding tool while holding the package, and then transporting the packaged object. By the way, in such a packaging machine, an endless delivery belt is disposed above the pushing up of the material to be packaged, and by operating this delivery belt and sending it in contact with the top surface of the material to be packaged, the surrounding area of the film is removed. A carrying-out device is provided which allows the carrying-out device to be carried out while folding one edge. Since this unloading device must not apply an excessive load to the packaged item, it is constructed so that when the packaged item is large, it floats up and applies its own weight as a pressing force.
However, when the packaged items supplied to the pedestal are pushed up, pressure is applied to the packaged items due to the weight of the carry-out belt, and the film is folded while this pressure continues to be applied. There is a risk of damaging the lower part of the tray or damaging the film.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a delivery device for a packaging machine that can apply pressure due to the weight of the delivery belt only when necessary for delivery.

[Summary of the invention]

The unloading device in the packaging machine of the present invention includes a frame pivotably supported on the main body frame side so as to be vertically rotatable, an unloading member provided on the frame so as to be movable back and forth, an actuating device for the unloading member, and a film. The unpacking device is equipped with a lift mechanism that lowers the unpacking member via a motion converting mechanism to contact the packaged items in response to the final folding operation of the folding device. It is controlled so that pressure contact force is applied to the package.

〔Example〕

4 and 5 show an overview of the overall configuration of a stretch film wrapping machine, in which the front side of the main body frame 1 is provided with objects to be packaged up to the lower part of the packaging section 2, which is approximately the middle part of the main body frame 1. A packaged article supply device A is provided with a conveyor 4 for conveying the packaged articles 3.

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 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 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 that is inserted into the endless belt 9 and transported to the packaging section 2 is disposed on both sides of the upper part of the main body frame 1 in the front-rear direction. A film cutting device D consisting of a cutter 10 for making perforations in the width direction of the film 7 at the end of the endless belt 9 on the insertion side of the stretch film 7, and a film presser 11 provided on both sides of the cutter 10. 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.

A carry-out device F is provided on the upper side of the main body frame 1, and includes a carry-out member 14 that moves in contact with the upper surface of the package 3a, 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 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 manner, 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 in to form a package 3a, and this package 3a is carried out by a carry-out member 14 and a transfer body 15 as shown in FIG. 6D.

In the present invention, in the carry-out device F, a carry-out member 14 is disposed at a rising standby position for the packaged object 3 placed on the pedestal 5, and the packaged object 3a with the film 7 folded on three sides by the folding bodies 12 and 13 is The film 7 is transferred by the transfer member 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 sealed by the transfer body 15 before being sent out. It is sent out by belt 19. The unloading device F of the present invention is the first to
As shown in FIG. 3, a frame 22 formed by connecting a pair of left and right rails 20 in the longitudinal direction of the film by a horizontal rod 21 is pivoted to the main body frame 1 side by a pivot 23 so as to be vertically rotatable. A substrate 24 is provided on the left and right rails 20 to which a carry-out member 14, which is a soft pressure member such as a sponge, is fixed and is movable back and forth. The above frame 22
is provided with a motor 25, a pinion 27 is provided on the drive shaft 26 of the motor 25, and the pinion 27
A rack 28 is provided on the frame 22 and is capable of reciprocating movement by engaging with the frame 22, and the front end side of this rack 28 is connected to the substrate 24.

Therefore, the delivery member 14 and the delivery belt 1
9 is activated and the upper surface side of the package 3a is transferred to the carrying out member 14.
The unloading member 14 reciprocates along the rail 20 via the rack 28 and pinion 27 while being pressed by its own weight to transport the package 3a onto the transport body 15. As a result, the packaging film 7 on the front side of the tray 18
The tray 18 is also folded into the lower side of the tray 18 and sealed on the transfer body 15 by the heat of the heat sealer 17, and then transported out by the delivery belt 19. Further, 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,
In the film folding device E, the base ends of a pair of left and right folding bodies 13 are supported by pivots 30 on the lower surface side of a fixed plate 29 installed on the main body frame 1 on the rear side of the packaging section 2 position, so as to be rotatable in the horizontal direction. Part 2
Rails 31 are provided in the front-rear direction on both sides of the main body frame 1 at the position, and a movable body 32 is provided on each of the rails 31. Both ends of the rear folding body 12 are fixed to the movable body 32, and the above-mentioned Left and right folding body 1
3 is formed with a guide groove 33 whose base side is curved inward in the length direction, and a guide roller 34 provided on the rear folding body 12 engages in this guide groove 33 to operate the rear folding body 12. As the rear folding body 12 and the left and right folding bodies 13 advance and close in synchronization with each other, a so-called three-way folding action is performed on the packaged object 3 on the pedestal 5 in which the rear and both sides are interlocked with each other. is formed.

By the way, in the present invention, as shown in FIGS. 1 to 3, a cam 35 facing in the direction of movement of the rear folding body 12 is provided on one side of the rear folding body 12 so that its position can be adjusted freely by a guide groove 36 and a set screw 37. , and unloading member 1
The frame 22 of the unloading device equipped with the arm 3
8 is attached, and a roller 39 that rides on the cam 35 and operates is provided at the tip of this arm 38. The cam 35 and roller 39 constitute a lift mechanism 40 having a motion conversion mechanism.

The cam 35 has one cam surface 35 that holds the carry-out member 14 at an upper position separated from the packaged object 3 before the carry-out operation of the rear folding body 12, that is, during the folding operation.
a and the other cam surface 35a' which lowers the carry-out member 14 and brings it into contact with the packaged object 3 during or slightly before carrying out. Therefore, the rear folding body 12
As the rear folding body 12 and the left and right folding bodies 13 are operated,
The film 7 is folded by the mutually synchronized three-way folding action of the rear folding body 1.
2 moves, the cam 35 also moves together, but since the roller 39 continues to engage with one cam surface 35a of the cam 35, the carry-out member 14 remains separated from the packaged object 3, and the rear folding body At or slightly before the final movement of 12, roller 3
9 engages with the other cam surface 35a' of the cam 35, the carry-out member 14 descends, comes into contact with the upper surface of the packaged object 3, and is carried out by the operation of the carry-out member 14. Also, as the rear folding body 12 returns to the rear, the motor 2
5 rotates in the opposite direction, and the unloading member 14 returns via the rail 20. In that case, the piston 41' is pivotally supported on the main body frame 1 side, the cylinder 41 is pivotally supported on the frame 22, and the piston 41 of the cylinder 41 is
The buffer member 42 consisting of 1' provides 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 35a', and the delivery member 14 comes into contact with the upper surface of the object to be packaged 3. It is possible to adjust the time.

In the above embodiment, the cam 35 was provided on the rear folding body 12 side, and the roller 39 was provided on the delivery member 14 side.
A roller 39 is provided on the side of the rear folding body 12 and the carrying out member 1
A cam 35 may be provided on the 4 side, and although a cam mechanism is shown as the lift mechanism, it may be configured such that the carrying out member is pressed against the packaged object and conveyed by the operation of a cylinder.

An example of the overall configuration of the packaging machine is shown in Fig. 4 and Fig. 5, but a film feeding device that clamps and feeds the film as in Japanese Patent Publication No. 56-35578 or Japanese Utility Model Publication No. 55-47992 may also be used. Publication No., Tokukosho
The film folding device disclosed in Japanese Patent No. 56-34484 may be used, and other configurations of the unloading device may be selected as appropriate.

〔Effect of the invention〕

The unloading device in the packaging machine of the present invention includes a frame pivotally supported on the main frame side so as to be vertically rotatable, an unloading member provided on the frame so as to be movable back and forth, an actuating device for the unloading member, and a film. It is equipped with a lift mechanism that lowers the unloading member via a motion conversion mechanism in response to the final folding operation of the folding device and brings it into contact with the packaged item. Since the pressure contact force is controlled to be applied to the packaged items, unnecessary pressure contact force is not continuously applied to the packaged items, and the operation of the device can be improved.In addition, the unloading member can be reciprocated. This eliminates the need for a complicated link mechanism, which has a great effect.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the present invention, FIG. 2 is a side view of the same,
Figure 3 is a sectional view of the same, Figure 4 is a longitudinal sectional view of the packaging machine,
FIG. 5 is a plan view of the same, and FIGS. 6A, B, C, and D are operation diagrams showing the packaging state. 2... Packaging department, 3... Item to be packaged, 3a... Packaged item, 14... Carrying out member, 20... Rail, 22...
... Frame, 40... Lift mechanism, A... Packaging object supply device, B... Pedestal lifting device, C... Film supply device, D... Film cutting device, E... Film folding device, F... ...Unloading device.

Claims (1)

[Claims] 1. A film supply device that unwinds a roll of stretch film and transfers it to a packaging section position, a packaged article supply device that transfers the packaged item onto a pedestal, and a device that moves the pedestal up and down at a position below the packaging section. and a film folding device that folds the stretch film onto the underside of the packaged object.
In a packaging machine equipped with a package unloading device for unpacking the packaged items folded by a film folding device, the unpacking device includes a frame pivotably supported on the main body frame side so as to be vertically rotatable, and the frame. an unloading member provided to be reciprocally movable;
A packaging machine characterized by comprising an actuating device for the unloading member and a lift mechanism that lowers the unloading member into contact with the packaged object via a motion conversion mechanism in accordance with the final folding operation of the film folding device. Device.