JPH05270522A - Lift in packaging machine - Google Patents

Abstract

PURPOSE:To make it possible to raise stably trays different in size from each other and perform the packaging satisfactorily in the use of a lift which raises trays filled with an object of packaging to a packaging position. CONSTITUTION:This lift is composed of a main lifter 8 and a sublifter 9. A driving lever 18 for the raising and lowering is connected to the main lifter 8 and a hook 28 is attached on the side of the main lifter 8; a sliding member 21 to engage with the hook 28 is provided on the side of the sublifter 9; when engaged, both the main lifter 8 and the sublifter 9 rise or descend simultaneously.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging machine for packaging a tray filled with articles to be packaged with a packaging film, and more particularly to a lifting device for pushing the tray to a packaging position.

[0002]

2. Description of the Related Art In a packaging machine for packaging a packaged product such as a fresh food product together with a tray, a packaged film previously cut into a predetermined length and tensioned and held by clamp means is used. After the tray filled with is pushed up to wrap the packaging film on the tray, the front, rear, left and right side edge portions of the packaging film are folded by the folding plates to the lower surface of the tray for packaging.

Therefore, the above packaging machine is equipped with a lift device for receiving the tray and pushing it up. The tray used for packaging varies in size depending on the size of the package and the type of the product to be packaged. Therefore, if the size of the lift device is configured to be able to push up the largest tray, the folding of the film by the folding plate will be obstructed when a small tray is used. Become.

Therefore, for example, Japanese Unexamined Patent Publication No. 63-2486.
In Japanese Unexamined Patent Application Publication No. 12-32, the above-mentioned lift device is composed of a main lifter and a sub lifter, and it is possible to select whether to lift the tray only by the main lifter or by both the main lifter and the sub lifter depending on the size of the tray used. This technology is disclosed. According to this, it is possible to carry out packaging by handling trays of various sizes in spite of being one packaging machine.

[0005]

By the way, in the technique of the above publication, since the main lifter and the sub lifter are combined and operated, the rotating shaft is rotated by the cam mechanism and the main lifter is always operated by the lever connected to the rotating shaft. When the electromagnetic clutch equipped on the rotary shaft is turned on, the driving force is transmitted to the sub lifter via the lever, and both the main and sub lifters are activated. I try to move up and down at the same time.

However, in the structure in which the sub-lifter is actuated by the rotational force via the electromagnetic clutch, there is a possibility that a slight deviation of the ON timing of the electromagnetic clutch may act in a state where the upper surfaces of both lifters are not aligned to push up the tray. Therefore, the trays on the main lifter and the sub lifter become unstable in posture, which may hinder the packaging, and the packaging state may not be nicely arranged.

[0007] Therefore, an object of the present invention is to provide a lifting device for a packaging machine capable of operating the main lifter and the sub lifter at the same time by aligning the upper surfaces of both lifters securely.

[0008]

That is, the present invention is a lift device of a packaging machine for supporting a tray filled with articles to be packaged from below by a lifter and pushing it up to a packaging position to wrap a packaging film on the tray. The lifter is composed of a main lifter and a sub lifter arranged in the vicinity of the main lifter, and a lifting drive means is connected to the main lifter. In addition to engaging and disengaging the lifters, the engaging means is provided so that the upper surfaces of the main lifter and the sub lifter are aligned and engaged at the time of engagement so that both lifters can be raised simultaneously.

[0009]

According to the above structure, since the main lifter and the sub lifter are simultaneously operated, the engaging means for engaging the sub lifter with the main lifter is provided between the both lifters. The relative posture of the lifter is determined by the shape of the engaging portion, which allows the upper surfaces of both lifters to be reliably aligned and moved up and down during the engagement.

[0010]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 shows a schematic structure of the packaging machine 1.
A weighing-in mechanism including a belt conveyor 3 is provided on the side of the lifter device 2, the tray X is supplied to the weighing-in mechanism, and the weight of the articles W to be packed in the tray X is not shown. After being weighed by the means, the tray X is loaded on the lift device 2 in the descending state.

A packaging station 4 is located above the lifting device 2, a packaging film Y cut according to the shape and size of the tray X to be packaged is supplied to the packaging station 4, and a clamping member is provided. It is adapted to be held in a state in which a predetermined tension force is applied by the members 5 and 5.

Further, a folding plate 6, which wraps the tray X with the wrapping film Y on the upper part of the wrapping station 4,
6 is arranged, and a seal mechanism 7 for heat-sealing the packaging film Y folded on the bottom surface side of the tray X is provided on the side portion thereof.

In the packaging machine 1 having such a structure, the tray X filled with the articles to be packaged W is supplied to the above-described weighing and conveying mechanism, whereby the articles to be packaged W are weighed and the belt conveyor. The tray X is lifted by the 3
Will be carried over. Then, the tray X is pushed up by the lift device 2 and pressed against the packaging film Y held in the packaging station 4 from below as shown by the chain line, and then the folding plates 6 and 6 are wrapped in the tray X. The side edges of the film Y are folded into the bottom surface of the tray, and after this folding, the tray X is pushed out onto the sealing mechanism 7 by means not shown, and the folded film portion is heat-sealed by the mechanism 7 to wrap it. Is completed.

The above-described lift device 2 used in this packaging machine 1 has a main lifter 8 as shown in FIGS. 2 and 3.
And a sub lifter 9 arranged by taking in the main lifter 8 in a substantially U-shape. In that case, the main lifter 8 includes the main lifter base 10 and the main lifter base 1
0, and a large number of support rods 11 to 11 standing upright, while the sub lifter 9 is the main lifter base 10 described above.
It has a sub lifter base 12 surrounding it and a large number of support rods 14 to 14 which are erected on the sub lifter base 12 via auxiliary plates 13 to 13.

The base block 15 is fixed to the lower surface of the main lifter base 10, the upper end of the lift rod 16 is connected to the back surface of the base block 15, and the lift rod 16 is connected via a connecting pin 17. One end of the drive lever 18 is pivotally attached. The drive lever 18 is connected to a drive means (not shown), and is rotated from the chain line state in FIG.
A lifting force is exerted on 6 to lift the lifting device 2 toward the packaging station 4 described above.

Further, in the base block 15 of the main lift table 10, a step-in portion 19 is formed in the central portion of the opposite surface to which the lift rod 16 is fixed, as shown in FIG. Left and right two guide rods 2
0 and 20 are mounted in the vertical direction, and a slide member 21 is fitted so as to be able to move up and down over these guide rods. 2 and 3, the slide member 21 is a bar-shaped member that is long in the left and right, and both ends of the slide member 21 extend below the sub-lift base 12 and the sub-lift base 12.
Is stuck to. Therefore, the sub lift base 12 (that is, the sub lifter 9) moves up and down together with the slide member 21.

Further, between the slide member 21 and the lift rod 16, the two guide rods 20,
Two tension springs 22 on both sides sandwiching 20,
22 is attached. In that case, a recess 23 is formed on the slide member 21 on the base block 15 side as shown in FIG. 5, and a stopper 24 attached to the recess 23 and a support plate 25 attached to a lower position of the lift rod 16 are provided. The tension springs 22 and 22 are stretched over the stoppers 26, and downward tension is applied to the slide member 21 by the tension springs 22 and 22.

A bracket 27 is fixed to the base block 15 at the upper position of the stepped-in portion 19, and a hook member 28 is attached to the bracket 27 so as to be vertically rotatable around a horizontal axis 29 (see FIG. 4). .. The hook member 28 is in a state in which the above-mentioned slide member 21 is at the upper position in the step-in portion 19 as shown in FIGS. 4 and 6.
The hook member 28 and the bracket 2 are engaged with and disengaged from the slide member 21 by the above rotation.
A tension spring 30 that applies a spring force to the hook member 28 in a direction of separating from the slide member 21 is attached to the hook member 28.

Further, in the lift device 2, when the device 2 is descending from the packaging station 4,
Further, as shown in FIG. 5, stopper means 31, 31 with which the above-mentioned slide member 21 abuts from above are provided, and the abutment position is set to the lowered position. In this state, as described above, the slide member 21 is located in the upper portion of the stepped-in portion 19 so that the hook member 28 can be engaged with the support rod 1 in the main lifter 8.
1 to 11 and the support rod 1 in the sub lifter 9
The upper ends of 4 to 14 are at the same height, and both lifters 8 and 9 are
The upper surface of the is substantially flush with the surface.

Further, with respect to the lift device 2 in the lowered state, both ends are supported by fixed members (not shown) outside the hook member 28 by the bearing members 32, 32 shown in FIG. The rotary shaft 33 is provided with one end of the plunger 34a of the solenoid 34.
Is connected to the solenoid 3 by a link mechanism 35.
The rotating shaft 33 is rotated by the excitation of No. 4. Then, by the rotation, the lever 36 attached to the rotary shaft 33 pulls the hook member 28 and pulls the spring 30.
The hook member 28 against the spring force of the slide member 2
It is configured to rotate in the direction of engaging with 1.

In the lift device 2 described above, the rotary shaft 33 and the hook member 36 are rotated by the solenoid 34 from the state where the lift device 2 is lowered, and the hook member 36 is moved to the slide member 21 as shown in FIG. When the lift rod 16 is lifted by the drive lever 18 from the engaged state, the base block 15 in the main lifter 8 and
The main lifter 8 and the sub lifter 9 are integrally lifted by the connection with the slide member 21 in the sub lifter 9. Therefore, the tray X described above can be supported and pushed up by the wide surfaces of the main lifter 8 and the sub lifter 9, and in this case, it is suitable for pushing up a large tray X. When the lift device 2 rises, the hook member 28 is separated from the lever 36, but the force of the spring 22 pulling the slide member 21 downward is reduced by the hook member 2.
8 for pulling 8 in the direction to come off the slide member 21
By making the force stronger than 0, the strong spring force enhances the frictional force acting between the slide member 21 and the hook member 28, and the ascending state is maintained while the engagement state is maintained. .

On the other hand, in the lift device 2 in the lowered state, if the hook member 28 is raised without engaging the slide member 21, the spring force of the tension spring 22 causes the slide member 21 to rise. Base block 15
Since it comes into contact with the above-mentioned stopper means 31, 31 while descending relatively toward the lower part of the step-in portion 19, as shown in FIG. 7, the upper ends of the main lifter 8 and the sub-reata 9 are connected. A step L occurs between them, and thereafter, both lifters 8 and 9 rise while maintaining this step L. In other words, the main lifter 8 moves up by the amount corresponding to the step L.

Therefore, since the tray X is supported and pushed up only by the main lifter 8, this case is suitable for pushing up a relatively small tray X.

As described above, the lifters 8 and 9 of the lift device 2 can be selectively used according to the size of the tray X, but especially the main lifter 8 when pushing up the large tray X.
The sub-lifter 9 and the sub-lifter 9 are locked by engaging the hook member 28 provided on the base block 15 on the main lifter 8 side with the slide member 21 on the sub-lifter 9 side. Therefore, if the engagement is performed, it is easy to ensure that the upper surfaces of the support rods 11 to 11 and 14 to 14 of the main lifter 8 and the sub lifter 9 are flush with each other. Therefore, the posture of the tray X on the support rods 11 to 11 and 14 to 14 is stable, the film can be reliably packaged in the packaging station 4, and the packaging state looks good.

Although the sub lifter 9 is arranged so as to surround the main lifter 8 as shown in the drawings in the above-described embodiment, the combination of the main lifter 8 and the sub lifter 9 is not limited to this.

[0027]

As is apparent from the above description, according to the present invention, the engaging means for engaging the sub lifter with respect to the main lifter is provided between the both lifters for the simultaneous operation of the main lifter and the sub lifter. Since it is provided, the relative postures of both lifters at the time of engagement are determined by the shape of the engaging portion, and thus the upper surfaces of both lifters can be reliably aligned and moved up and down at the time of the above engagement. .. Therefore, the posture of the tray on the lifter at the time of pushing up is stable, the packaging with the packaging film can be stably performed, and the packaging state looks good.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a packaging machine according to an embodiment of the present invention.

FIG. 2 is a plan view of a lift device in the packaging machine.

FIG. 3 is a front view of a lift device.

FIG. 4 is a cross-sectional view of a lift device.

FIG. 5 is a cross-sectional view of a main part of the lift device.

FIG. 6 is an explanatory diagram of an operating state of the lift device.

FIG. 7 is a diagram illustrating another operation state of the lift device.

[Explanation of symbols]

 1 Wrapping Machine 2 Lifting Device 4 Wrapping Station 8 Main Lifter 9 Sub Lifter 18 Drive Lever 21 Slide Member 28 Hook Member 36 Lever W Wrapped Item X Tray

Claims (1)

[Claims] 1. A lift device of a packaging machine for supporting a tray filled with an article to be packed from below by a lifter and pushing it up to a packaging position to wrap a packaging film on the tray, wherein the lifter is a main lifter, It is composed of a sub lifter arranged in the vicinity of the main lifter, and a lifting drive means is connected to the main lifter, and between the main lifter and the sub lifter, these lifters are disengaged from each other in a lowered state of both lifters, A lifting device for a packaging machine, comprising: an engaging means for aligning the upper surfaces of the main lifter and the sub lifter at the time of engagement so that both lifters can be simultaneously raised.