JPS61142111A - Film hold-down device for packaging in packaging machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Purpose of the Invention (Industrial Field of Application) This invention is particularly directed to a fruit and vegetable packaging machine for packaging flexible trays, in which a belt-shaped packaging film stretched over the packaging section by a conveyance device is used to wrap products. This invention relates to a packaging film holding device that holds the front, rear, left, and right edges of a packaging film when wrapping an item by folding it from the front, rear, left, and right directions.

(Prior art and problems to be solved by the invention) Conventionally, for example, in the packaging machine described in Japanese Patent Application No. 56-189426, the packaging film stretched in the packaging section is When the tray on the pedestal device is pushed up to the packaging position while being held between both presser members, the packaging film is stretched covering the tray from above, and then the folding device is placed under the tray. The packaging film is folded and the tray is wrapped.

That is, for example, in the folding device of the packaging machine, the rear folding member moves in the front and rear directions with respect to the fixed front folding member, approaches and separates from each other, and as the rear folding member moves back and forth below the rear folding member, both left and right folds are folded. The members open and close with each other, and the article mounting table erected on the pedestal device can be tilted inward by contact with the rear folding member and both left and right folding members.

Then, when the rear folding member moves forward and the left and right folding members are closed together, these folding members push the packaging film toward the bottom of the tray on the mounting table and push it against the mounting table. Touch it and tilt it. When the pedestal device moves downward at the same time as this tilting, the tray is sequentially placed on the rear folding member from the rear side of the lower surface, and the packaging film is folded under the tray from both rear and left and right directions. After that, when the tray is conveyed forward by the rotation of the conveyor belt and transferred from the rear folding member to the front folding member, the packaging film hits the front folding member on the underside of the tray during the transfer and is folded from the front as well. The folding from the rear overlaps with the folding from both left and right directions, and the folding from the front overlaps to form a folded portion at the bottom of the tray. Next, the rear folding member retreats, and as the rear folding member retreats, the left and right folding members also open from each other.

However, if the packaging film stretched in the packaging section is only held between the front and rear pressing members, when the packaging film is pushed up by the tray and the packaging film is stretched while covering the tray from above, , the stretching may become uneven, resulting in wrinkles, which may deteriorate the packaging condition. Therefore, in addition to the front and rear press members, the packaging film is held between the left and right press members.

However, if the packaging film is folded while being held between the front, rear, left and right pressing members, there is a risk that the packaging film will be crushed by the folding force. Therefore, it is necessary to release the clamping by the 8 presser members in consideration of the wrinkles that occur in the packaging film and this crushing.The timing of release is very difficult, and usually the clamping by both the left and right presser members is released first. Ta.

On the other hand, if the packaging film is directly pushed up by the product, especially when packaging flexible or tall trays, the tray may deform and the soft items stored in the tray may be crushed, reducing the product value. It was also the cause of

Therefore, the present applicant has developed a new packaging machine equipped with a push-up member that pushes up the packaging film before covering the product with the packaging film from above during folding.

That is, in this packaging machine, the packaging film stretched in the packaging section is first pushed up by the push-up member, and then the item rises and comes into contact with the packaging film, and the push-up member separates from the packaging film. The item is covered with a packaging film from above. Then, a folding operation of the packaging film is performed. Therefore, since the raising and lowering of the push-up member is related to the pushing up and folding of the packaging film, if the pressing operation of the packaging film is linked to the rise and fall of this push-up member, the timing of clamping or releasing the presser member can be made easier. We focused on the fact that it can be set to .

Structure of the Invention (Means for Solving Problems) The present invention has been made in view of this point, and as shown in the drawings of embodiments to be described later, a conveying device 1 for conveying a band-shaped packaging film F to a packaging section S is provided. and a folding device 76 that wraps the product W by folding the packaging film F stretched in the packaging section S into the product W from the front, back, left and right directions. Pressing member 26.3
7 and both left and right pressing members 177 are disposed in the packaging section S corresponding to the front, left and right edges of the packaging film F, and the packaging film The left and right presser members 177 are linked to the push-up member 171 that pushes up F.

(Function) The packaging film F is first pushed up by the push-up member 171, and then the article W rises and comes into contact with the packaging film F, and the push-up member 171 separates from the packaging film F, and the article W is covered with a packaging film F from above. In conjunction with the vertical movement of the push-up member 171, the left and right pressing members 177 clamp or release the packaging film F.

(Example) Hereinafter, an outline of a packaging machine equipped with a packaging film pushing device according to an example of the present invention will be described with reference to the drawings.

Figures 1 to 4 show a round belt type conveying device 1 arranged at the top of the machine frame, and its film supply port P is shown in Figure 2.
The starting end of the packaging film F is guided and set from the opening, and from this set state, the packaging film F is stretched into the packaging section S shown in FIG. 1 by driving the transport device 1.

Fig. 1.3.4 shows the packaging film folding device 76 disposed above the conveying device 1, and includes a fixed front folding member 89 and a folding film folding device 76 that moves toward and away from the front folding member 89 in the front and rear direction. The rear folding member 77 is movable to the rear folding member 77, and the left and right folding members 82 are supported on both left and right sides below the rear folding member 77 so as to be rotatable in the left and right direction.
7 moves back and forth, the left and right folding members 82 are linked to each other so that they can be opened and closed, and these front and rear, left and right folding members 89
, 77.82 is a folding portion R in which each folding member 89, 77°82 approaches each other and folds the packaging film F into the article W on the lower side thereof. This folding section R corresponds to the packaging section S of the conveying device 1, as shown in FIG.

Reference numeral 151 denotes a pair of mounting members supported above the rear folding member 77 so as to be rotatable in the left and right directions corresponding to both the left and right folding members 82, and are normally urged to open each other. As the folding member 77 moves back and forth, the placement member 151 is restricted from opening. 161 is both device members 151
The push-out member is supported above the folding member so as to be movable in the front-rear direction, and is configured to reciprocate from the rear position to the vicinity of the front folding member 89. 104 is a belt conveyor supported above this extrusion member 161 so as to be able to move in parallel in the vertical direction, and is a belt conveyor that is
is supported.

As shown by the white frame in FIGS. 1 and 2, 46 is a pedestal device that is moved up and down between the inner end of the supply device 45 and the packaging section S and the folding section R, and is biased to be tiltable. The supply device 45 is provided with a plurality of mounting tables (not shown) with
The article W is transferred from and placed thereon.

(See Japanese Patent Application No. 58-41304.) In Figures 1 to 4, 26 is a front presser member attached to the front side of the packaging section S of the packaging film conveying device 1, and 37 is a rear presser member also attached to the rear side. These pressing members 26 and 37 are designed to hold both front and rear edges of the packaging film F stretched in the packaging section S.

Reference numeral 43 denotes a saw blade mounted near the film supply port P of the packaging film conveyance device 1, and is configured to form perforations at intervals of a certain length of the packaging film F during conveyance.

As shown in FIGS. 1.2.5 to 10, reference numeral 171 is a push-up member connected by a shaft 173a to the tip of a lever 173 fixed to a rotating wheel 172 on both left and right sides of the pedestal device 46. , consists of both upright rods 171a extending upward from this shaft 173a, and a frame 171b that is removably inserted between the upper ends of both of these upright rods 171a, and a lever 174 is located in the middle of both of these upright rods 171a. axis 174
A is rotatably connected to form a horizontal rank mechanism. Reference numeral 175 denotes a lever plate rotatably supported on the upper end of the link 176 with a shaft 176a on both left and right sides of the frame body 171b, and 177 denotes this lever plate 17.
5, both left and right pressing members are tiltably supported on 1;
Reference numeral 78 denotes a guide elongated hole formed along the longitudinal direction of the link 176, into which a guide piece 179 fixed to the lever 174 is inserted. 180 is the lever 173
A spring connected to the lever 173, which is always connected to the lever 173.
is biased to tilt downward.

Reference numeral 181 denotes a spring connected to the lever plate 175, which always urges the lever plate 175 to tilt upward. Reference numeral 182 denotes a pressure receiving plate fixed to the machine frame above and facing the left and right presser members 177.

When the lever 173 is tilted downward by the bias of the spring 180 as shown in FIG.
The upright rod 171a of the push-up member 171 moves downward and its frame 171b also moves downward, and along with this downward movement, the lever 174 tilts downward and pulls down the link 176. It tilts downward against the bias, and both the left and right pressing members 177 also move downward and away from the pressure receiving plate 182. From this state, as shown in FIG. 7, when the lever 173 is tilted upward against the bias of the spring 180 by rotating the rotation axis 1°72, the upright rod 171a of the push-up member 171 moves upward. Then, the frame body 171b moves upward toward the packaging section S and the folding section R. When the lever 174 tilts upward with this upward movement, the guide piece 179 moves upward along the guide elongated hole 178 of the link 176. Following this, the lever plate 175 tilts upward under the bias of the spring 181 and pulls up the link 176, and when the frame 171b reaches the vicinity of the pressure receiving plate 182, both the left and right presser members 177 are pressed against the pressure receiving plate 182. On the other hand, they are pressed together by the urging force of the spring 181. Left and right presser members 1
When the lever 173 is tilted upward as shown in FIG. 8 while the lever 77 maintains this pressed state, the frame 171b further moves upward and the guide piece 179 of the lever 174
moves upward l\ along the guide elongated hole 178 of the link 176, and when this guide piece 179 is locked to the upper end of the guide elongated hole 178, the lever 174 stops tilting and the frame 171b also stops. Conversely, when the lever 173 tilts downward, the upright rod 171a of the push-up member 171 and the frame 1
71b moves downward, the lever 174 tilts downward, and the kite piece 179 engages the guide elongated hole 1 of the link 176.
78 and move downward. Accordingly, as shown in FIG. 10, when the link 176 is pulled down when the guide piece 179 is locked to the lower end of the guide slot 178, the lever plate 175 is tilted downward by the bias of the spring 181. Both the left and right pressing members 177 move downward and separate from the pressure receiving plate 182.

In addition, 47 is a heater device on which the equipment constituted by the front folding member 89 is placed.

Next, an outline of the actual packaging operation will be explained.

When the article W (the tray W1 containing the article) is placed on the supply device 45, the article W is transferred and placed on the pedestal device 46 that has moved downward.

At this time, the push-up member 171 is already at the lowest movement position,
Also, the rear folding member 77 retreats.

When the conveyance device 1 is driven in synchronization with this feeding, the starting end of the packaging film F located at the supply port P is conveyed toward the packaging section S in the center of the conveyance device 1. On the way, the saw blade 43 forms perforations in the width direction of the packaging film F at every fixed length, and an instantaneous brake is applied at the supply port P, and the packaging film F is pulled.
Due to this tensile force, it is cut at the perforations and conveyed to the top of the packaging section S.

The packaging film F on the packaging section S is held by both the front and rear pressing members 26.
It is clamped by the upward movement of 37.

When the push-up member 171 is moved upward from this packaging film set state, when the frame 171b reaches the packaging film F as shown in FIG.
7 comes into contact with the pressure receiving plate 182 and also clamps both left and right edges of the packaging film F. Thereafter, as shown in FIGS. 2 and 8, the packaging film F is pushed up and stretched by the frame 171b. In this way, when not only the front and rear edges but also the right and left edges of the packaging film F are clamped, the packaging film F is uniformly stretched and wrinkle-free when pushed up by the frame 171b.

Next, as shown in FIG. 9, the pedestal device 46 moves upward and the article W comes into contact with the packaging film F, and as shown in FIG. The article W is then covered with the packaging film F from above.

At this time, the article W is pressed down from above by the stretching of the packaging film F, but the packaging film F is usually held by the frame 171.
Since the product W does not shrink much in a short period of time after it is stretched by the upward movement of b and until the end of packaging, not much pressing force is applied to the product W. The left and right pressing members 177 separate from the pressure receiving plate 182 as the frame 171b moves downward, and the left and right edges of the packaging film F are released from being held. By this release, the pressing force on the item W is further reduced. In this way, the packaging film F is not pushed up directly by the item W, but the dedicated push-up member 171 is used, so even when packaging a flexible tray W1 or a tall tray W1. , tray W1
There is no possibility that the soft items stored in the tray W1 will be crushed due to deformation. Also, in conjunction with the vertical movement of the push-up member 171, both the left and right press members 177 move toward and away from the pressure receiving plate 182, so that the frame 17 against the packaging film F
1b is pushed up or separated, the timing of clamping or releasing the left and right presser members 177 can be easily set with a simple structure, and the functions of the left and right presser members 177 can be controlled in relation to the frame 171b. It can be fully fulfilled.

Thereafter, as the pedestal device 46 moves upward, the rear folding member 77, which is in the retracted position, moves forward. Along with this forward movement, the remounting members 151 approach each other. This reloading member 151 pushes the packaging film F toward the lower side of the item W on the mounting table of the cradle device 46, and also pushes the packaging film F onto the same loading table at a position slightly spaced downward from the bottom surface of the tray W1. It makes contact and tilts, enters below the item W, and places it thereon. At this time, as the rear folding member 77 moves forward, the left and right folding members 82 also approach each other with a slight delay. Next, the rear folding member 77 and the left and right folding members 82 are used to place the item W in the same way as the remounting member 151.
When the rear folding member 77 enters sufficiently below the article W, the remounting members 151 are separated from each other and separated from the article W, and the article W is placed on the rear folding member 77. Then, when the pedestal device 46 moves down again,
While the item W is placed on the rear folding member 77, the packaging film F is folded under the item W from both rear and left and right directions. In synchronization with this folding operation, the clamping by the rear presser member 37 is released, and only the clamping by the front presser member 26 is maintained.

At the time of folding, the pushing member 161 moves forward and approaches the article W, and then, when the pushing member 161 roughly advances and pushes out the article W, the clamping by the front presser member 26 is released and the belt conveyor 104 is rotated. The article W is conveyed forward by the advancement of the push-out member 161 while being separated from or in contact with the belt conveyor 104, and is supported from above by the belt conveyor 104 to prevent swinging while being held by the rear folding member 7.
7 and onto the front folding member 89.

During the transfer, the packaging film F hits the front folding member 89 on the lower side of the item W and is folded in from the front, and the folding from the rear is overlapped with the folding from both left and right directions, and the folding from the front is further overlapped. The folding part is on the bottom side.

Next, the rear folding member 77 retreats, and as the rear folding member 77 retreats, the left and right folding members 82 open each other, and the extrusion member 1
61 also retreats.

The article W to be packaged is carried out to the heater device 47, where the folded portion is brought into close contact, and one process is completed.

Effects of the Invention In short, according to the present invention, the packaging film F is not pushed up directly by the item W, but the dedicated push-up member 171 is used, so that the packaging film F is not pushed up directly by the product W, so that it can be used in a flexible tray W1 or a tall tray W1.
Even when packaging items, there is no risk that the tray W1 will deform and the soft items stored in the tray W1 will be crushed. This not only helps maintain and improve the product value, but also allows the push-up member 171 to Double presser member 1
77 is interlocked with each other, both the left and right presser members 1 are moved as the presser member 171 is pushed up or separated from the packaging film F.
The timing for clamping or releasing 77 can be easily set, and the functions of both left and right pressing members 177 can be sufficiently performed in conjunction with push-up member 171.

[Brief explanation of the drawing]

FIG. 1 is a schematic side sectional view of a fruit and vegetable packaging machine using a packaging film pushing device according to an embodiment of the present invention;
The figure is a schematic cross-sectional view of the packaging machine taken along the line x-X in Figure 1.
Figure 3 is a schematic enlarged side sectional view of the folding device and the unloading device;
FIG. 4 is a schematic enlarged sectional view of the screen display device taken along the line X-X in FIG. , and FIGS. 7 to 10 are schematic side views showing the vertical movement of these and the positional relationship between them and the pedestal device. Packaging film transport device 1, front press member 26, rear press member 37, supply device 45, pedestal device 46, folding device 76,
Rear folding member 77, left and right folding member 82, front folding member 89
, belt conveyor 104, placing member 151, pushing member 161, pushing up member 171, upright rod 171a, frame 17
1b, levers 173, 174, links 176, left and right pressing members 177, guide elongated holes 178, guide pieces 179,
Pressure receiving plate 182, packaging film F, packaging section S, folding section R
1 item W0 Patent applicant Fujiback System Co., Ltd. Agent Patent attorney On 1) Hironobu Figure 5 Figure 6 182'ji 175 Figure 7 ↓ Figure 8 Figure 9 F j ↓ Figure 10/F ↓

Claims (1)

[Claims] 1. A conveyance device (1) that conveys a band-shaped packaging film (F) to a packaging section (S), and a conveyance device (1) that conveys a band-shaped packaging film (F) to a packaging section (S), and a conveyor device (1) that conveys a band-shaped packaging film (F) to a packaging section (S); The product (W) is folded in from the front, back, left and right directions of W).
In a packaging machine equipped with a folding device (76) for wrapping a packaging film (F), both front and rear pressing members (26) clamp a packaging film (F).
) (37) and both left and right pressing members (177) are arranged in the packaging part (S) corresponding to the front, left and right edges of the packaging film (F), and the product (W) is held from above when folded. Packaging film (F) before covering with packaging film (F)
A packaging film pressing device for a packaging machine, characterized in that both the left and right pressing members (177) are linked to a pushing up member (171) that pushes up the film.