JPS6323287Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is used in a vacuum packaging machine for plastic packaging film to be packaged, and is capable of lifting and lowering the vacuum box, which is equipped with a heat source for heating and softening the packaging film, without relying on power from a power cylinder or the like. The present invention relates to a vacuum packaging machine that is capable of properly performing vertical vacuum packaging operations on items to be packaged by manually operating an operating handle to properly move up and down in the vertical direction via a lifting mechanism.

Conventionally, in vacuum packaging of items to be packaged using plastic packaging films, the upper packaging film is held between upper and lower support frames and raised to the lower level of an electric heater installed above to heat and soften it.
By lowering the upper and lower support frames, this softened packaging film is lowered onto the object to be packaged on the vacuum pulling board installed below, and at the same time, the object to be packaged is tightly wrapped by the vacuum action. It is known that the vacuum packaging is completed by covering the container.

However, according to this vacuum packaging machine, the upper and lower support frames that clamp and lower the packaging film are moved by an arm lever that is an interlocking mechanism, so the upper and lower support frames move forward while descending together with the packaging film. I'm starting to do that. For this reason, stationary packaged items placed on a vacuum platform with a breathable mount, etc., especially relatively lightweight and easy-to-move items, are moved forward and downward. There was a drawback that the packaging could not be properly packaged because it would be displaced or deformed due to pressure and movement.

Therefore, the upper packaging film, which has been softened by heating, is held between the upper and lower support frames, and is lowered and moved forward via the arm lever mechanism.The slide for placing the packaged item on the upper surface of the negative pressure chamber is synchronized with the lowering operation. The member is slid forward, and at the end of the lowering of the packaging film on the negative pressure chamber and the end of the forward sliding of the slide member, the air intake hole in the upper wall of the negative pressure chamber and the air intake hole in the slide member are connected. Vacuum-tight packaging that prevents shifting and sliding pressure of the packaged items and properly vacuum-packs them by connecting them and simultaneously enveloping the packaged items with the suction action from inside the negative pressure chamber. This machine was developed by the present applicant and has already been filed as Publication of Utility Model Publication No. 16806/1983 and is well known.

However, even in the vacuum tight packaging machine mentioned above, the upper and lower support frames do not descend vertically, so the perforated plate slides on the negative pressure chamber in synchronization with the movement of the support frames downward and forward. In addition to requiring a slide member consisting of a slide member, an interlocking mechanism between the slide and the support frame is required, resulting in a complicated structure and increased manufacturing costs.

This invention eliminates the drawbacks of the conventional vacuum packaging machine, allows the vacuum box, which is equipped with a heat source for heating and softening the packaging film inside, to be steadily and easily vertically raised and lowered by manual operation, and the slide member and its sliding It is possible to prevent displacement or pressure deformation of the packaged object with a simple structure without requiring a moving mechanism.

The embodiment of this invention shown in the drawings will be described below.A negative pressure chamber 3, from which internal air is sucked by a vacuum pump (not shown) through an intake pipe 2, projects upward from the upper part of the vacuum table board 1. A porous wall 4 is provided on the upper surface of the vacuum chamber for vacuum suction through a large number of small holes.

Above the negative pressure chamber 3, a lower support frame 5 that can be tightly fitted to the outer circumference of the perforated plate 4 is installed so as to be vertically movable, and on the front left and right outer sides of the lower support frame 5, operating handles 6 for raising and lowering the frame are provided. It is attached.

Above the lower support frame 5, a vacuum box 7 with an open bottom surface is installed so as to be vertically movable, and at the lower periphery of the opening is an upper support that faces the lower support frame 5 and can overlap with it in close contact. A frame 8 is attached, and operating handles 9 for raising and lowering the vacuum box 7 together with the vacuum box 7 are attached to the front left and right outer sides of the upper support frame 8.

In the upper part of the vacuum box 7, there is a heat source H that radiates thermal energy downward from an electric heater such as a sheathed heater or a quartz tube heater, and there are gaps 1 on both sides of the heat source H.
A predetermined gap 11 is maintained below this heat source H, and a metal heat reflecting plate 12 such as aluminum foil maintains a gap on the circumferential side, and the inner wall of the vacuum box 7 is connected to the inner wall of the vacuum box 7 by a stay ST. This heat reflecting plate 12 is installed almost horizontally on the sixth,
As shown in FIG. 7, the peripheral edge portion is bent inside the reinforcing outer frame 13 and held by the fitting inner frame 14 to maintain a tensioned state at all times.

The vacuum box 7 has an inlet opening 1 in its top wall that communicates with an air supply device F such as an air compressor or an air supply fan that pumps air at room temperature or high temperature into the interior.
5, through which the air introduced under pressure from the air supply device F into the upper chamber R is heated to a high temperature by a heat source H and sent downward. This air supply device F is installed on the top wall 16 of the vacuum box 7, or installed outside the machine via a flexible high-pressure pipe connected to the inlet opening.

The vacuum box 7, the upper support frame 8 attached thereto, and the lower support frame 5 are adapted to be moved up and down by a lifting mechanism which will be described below.

A downwardly bent portion 17 provided at the rear end of the arm lever 16 horizontally protruding from both sides of the rear end of the upper support frame 8.
is pivotally connected via a pivot 19 to an arm bracket 18 that projects horizontally from the rear end of the lower support frame 5;
The vacuum box 7 is configured to be able to stand up from a horizontal position using the pivot shaft 19 as a fulcrum. A tension coil spring 21 is connected between the respective spring hooks protruding from the upwardly bent portion 20 at the rear end.

When the vacuum box 7 is on its back, the upper film F ₁ fed out from a belt-shaped thermoplastic plastic flat film roll supported by a bracket 22 provided at the rear of the vacuum platform 1 is placed between the upper support frame 8 and the lower support frame 5. This is done in order to pull it out almost horizontally in between, and it is stopped when the downward bent part 17 of the arm bracket 16 is engaged with the stoppers 23 protruding from both sides of the vacuum pulling table board 1 and turned upside down at a predetermined angle. It's getting old.

The lower support frame 5 is X-shaped on both sides of the vacuum table 1.
The link 24 and 26 are supported by two diagonal links 24 and 26 which are pivotally connected at the central intersection by a pivot 27 so as to be capable of being raised and lowered vertically.

One link 24 has its upper end attached to the shaft of the operating handle 6 at both ends of the lower support frame 5, and its lower end has a hook shape and connects the corner of the bent part 28 to a vacuum via a slider or a wheel. It is movably fitted into horizontal groove-shaped guide rails 29 with upward openings provided below both rear sides of the platform board 1.

The other link 26 has an upper end 30 connected to a horizontal groove-shaped guide rail 3 with a downward opening, which is provided above both rear sides of the vacuum pulling board 1 via slides or wheels.
1 so as to be movable, and its lower end is pivotally connected to the bottom of both sides of the middle part of the vacuum pulling table board 1 by means of a pivot 25.

Therefore, when the lower support frame 5 is lifted by grasping the operation handle 6, each link 24, 26 has its lower end connected to the pivot 2.
5 and the guide rail 29, it rotates upright about the pivot 27 at the intersection while being guided in the horizontal direction along the guide rails 29, 31, and the upper support together with the lower support frame 5. Frame 8
and the vacuum box 7 can be raised vertically, and when the lower support frame 5 is pushed down with the operation handle 6 from this raised position, each link 24, 2
6 rotates so as to lie down in the opposite direction to the above, and can lower the upper support frame 8 and the vacuum box 7 together with the lower support frame 5 in the vertical direction.

In this case, since the lower support frame 5, the upper support frame 8, and the vacuum box 7 have to lift considerably large weights during the lifting operation, the latch pin 32 protruding from the lower end of the link 24 and the pivot at the lower end of the link 26 25
A tension coil spring 33 is connected between the links 24 and 26, which applies a tension force to the links 24 and 26 to draw them together, and causes the lower support frame 5 to rise vertically in balance with the above weight via the link 24. It is configured so that it can apply force and easily perform vertical lifting operations with a small amount of force.

Note that the latch pin 32 at the lower end of the link 24
is a guide groove 34 provided on the rear wall of the guide rail 29.
By sliding inside, the lower end of the link 24 can be smoothly moved while preventing it from falling off.

Further, a stopper 35 is provided on the side surface of the vacuum platform board 1 to lock the link 26 at its rising limit in order to regulate the upper limit position when the lower support frame 5 is raised. A micro switch 36 is provided nearby, which is turned ON when the link 26 rises at the highest position of the lower support frame 5, and heats the heat source H by energizing it.

When performing packaging work using the vacuum seal packaging machine of this invention configured as described above, first, the eighth
As shown in the figure, in the lowered state where the lower support frame 5 is fitted around the perforated plate 4, by lifting the upper support frame 8 with the operation handle 9, the front side of the vacuum box 7 is opened as shown in FIG. After raising the film slightly above the perforated plate 4 to open the lower part, the upper film _F1 fed out from the film roll is placed on the upper supporting frame 8.
Then, a lower film made of a plastic flat film or _the like is placed on the perforated plate 4.

Next, as shown in FIG. 10, push down the operation handle 9 of the upper support frame 8, hold the upper film _F1 between the front and rear frames of the upper support frame 8 and the lower support frame 5, and hold the operation handle 9. The lower support frame 5 is slightly lifted together with the upper support frame 8 and the vacuum box 7, and the article to be packaged S is placed on the lower film _F2 placed on the perforated plate 4.

Further, when the vacuum box 7 is raised to the highest position, the heat source H starts heating, and the inside of the vacuum box 7 is heated, and the upper film F ₁ held between the lower support frame 5 and the upper support frame 8 is heated to some extent. It softens.
In this heated state, the lower support frame 5 is
At the same time, the upper support frame 8 and the vacuum box 7 are lowered,
As shown in FIG. 10, the lower support frame 5 is tightly surrounded around the perforated plate 4 to seal the vacuum box 7, and at the same time, the air supply device F is activated to introduce heated air into the upper chamber R of the vacuum box 7. Then, the heated air is passed through a heated atmosphere by a heat source H and applied to the upper film _F1 as heated air of a higher temperature to soften it by heating and bring it into close contact with the article S to be packaged.

Almost simultaneously with the operation of the air supply device F, the inside of the negative pressure chamber 3 is vacuum-suctioned, and air is taken in from the perforated plate 4.
The air between the upper and lower films F ₁ and F ₂ is sucked, and the air inside the vacuum box 7 is also sucked through the gaps on both sides of the films F ₁ and F ₂ , and in this state, the air supply device F stops operating. In order to seal the inside of the vacuum box 7, the inside of the vacuum box 7 becomes a vacuum state.
The films F ₁ and F ₂ are vacuum-adhered to the packaged object S, and the softened upper film F ₁ is welded to the lower film, completing the vacuum packaging as shown in FIG.

In this case, the upper film F ₁ is placed in the vacuum box 7
Since the package S is moved vertically along with the package S, the packaged article S is brought into close contact with the packaged product S smoothly from vertically upward without being moved or applying excessive pressing force, resulting in extremely appropriate vacuum close packaging.

As described above, according to this invention, the lower support frame 5 is supported by two links 24 and 26 which intersect with each other in an X shape and are pivoted by a pivot 27 at the central intersection, and one of the links 24 is connected to the upper end thereof. is pivotally attached to the side surface of the lower support frame 5, and is slidably fitted back and forth to a guide rail 29 whose lower end is horizontally fixed to the lower side of the vacuum table board 1, and the other link 26 is Its upper end is fitted into the guide rail 31 which is horizontally fixed to the lower support frame 5 so as to be slidable back and forth, and its lower end is pivotally connected to the side surface of the vacuum pulling table board 1, so that the lower support frame 5 By raising and lowering it with its operating handle 6, it is possible to raise and lower it only in the vertical direction without moving it in the front-back direction.As a result, the lower support frame 5 and the upper support frame 8
The upper film F ₁ held therebetween falls vertically to the packaged object S at the time of its descent,
The object to be packaged S is firmly adhered to the object S from vertically upward without being displaced or subjected to sliding pressure.
It becomes possible to perform vacuum packaging appropriately.

Further, the horizontally movable ends of the links 24 and 26 are fitted to guide rails 29 and 31 horizontally fixed to the vacuum tension board 1 so as to be slidable back and forth. and 2
6. The mutual expansion and contraction operation is smooth and light, and since the link 24 is connected with a tension spring 33 that applies a tensile force to rotate it in the rising direction, this By applying an operating force in the direction of raising the lower support frame 5, the weight of the lower support frame 5, the vacuum box 7, and the upper support frame 8 can be reduced, and the lower support frame 5 can be easily raised with a slight force.

Furthermore, since the vertical movement of the vacuum box 5 is performed by manual operation of the operating handle, there is no need for equipment and power costs required for automatic operation using a power cylinder or electric power, and there is also no cost for security, adjustment, etc. There is no need for this, and the vacuum packaging machine can be manufactured at low cost and provided at a relatively low price.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the vacuum box in a lowered state, Fig. 2 is a perspective view showing the vacuum box in a supine state, Fig. 3 is a perspective view showing the vacuum box in a raised state; Fig. 4 is a partial perspective view showing the elevating mechanism of the vacuum box, Fig. 5 is a longitudinal sectional front view of the main part showing the internal structure, Fig. 6 is a plan view of the heat reflector, and Fig. 7 is a longitudinal sectional front view of the same part. 8 to 12 are schematic front views showing the packaging process using the vacuum tight packaging machine of this invention. DESCRIPTION OF SYMBOLS 1...Vacuum tension board, 3...Negative pressure chamber, 4...Porous plate, 5...Lower supporting frame, 6...Operation handle, 7...
...Vacuum box, 8...Upper support frame, 9...Operation handle, 24, 26...Link, 25, 27...
Pivot, 29, 31...guide rail, 33...tension spring.

Claims (1)

[Scope of utility model registration request] A porous wall 4 in which a negative pressure chamber 3 is formed on the vacuum platform board 1
A lower support frame 5 with an operating handle 6 is provided on the outer periphery of the porous wall 4 and can be placed closely on the vacuum platform board 1.
The rear part of a vacuum box 7 with an open lower part is pivoted so that it can be raised and lowered freely, and an upper support frame 8 with an operating handle 9 is attached to the lower circumference of the vacuum box 7. Links 24 and 26 are disposed between the side surface and the left and right side surfaces of the lower support frame 5, intersecting each other in an X-shape and pivotally connected by a pin 27 at the central intersection.
4 has its upper end pivotally connected to the side surface of the lower support frame 5, and its lower end fitted into a guide rail 29 horizontally fixed to the lower side of the vacuum tensioning table 1 so as to be slidable back and forth. The upper end of the link 26 is fitted into the guide rail 31 horizontally fixed to the lower support frame 5 so as to be slidable back and forth, and the lower end is pivotally connected to the side surface of the vacuum pulling board 1. A vacuum packaging machine characterized by being connected to a tension spring 33 that applies a tension force to rotate the vacuum packaging machine in a rising direction.