JPH0333571B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention is used, for example, in a vacuum packaging machine, etc., and seals gas in a bag containing an object to be packaged and heat seals it. The present invention relates to a gas filling device.

(Prior art) This type of gas filling device is, for example,
As described in Publication No. 144581, a hot ray receiving part, a hot ray fixing part that has a hot ray and connects and separates the hot ray from the hot ray receiving part, and a gas is ejected between the hot ray receiving part and the hot ray fixing part. and a nozzle with a gas outlet bent horizontally, and the opening of the bag containing the item to be packaged is placed between the heat ray receiving part and the heat ray fixing part, and is placed over the nozzle, so that the gas jet of the nozzle is Gas is injected directly into the bag from the outlet, gas is sealed inside the bag, the hot wire of the hot wire fixing part is pressed against the hot wire receiving part, and the opening of the bag is welded by applying electricity to the hot wire, and the inside of the bag is sealed. The packaged items are sealed in a gas-filled state.

By the way, when gas is sealed in a bag and sealed by welding, the direction in which the gas is ejected matches the direction in which it escapes from between the heat ray receiver and the heat ray fixing part of the bag.
The bag may move due to the force of the gas jet, and the opening of the bag may fall off from the nozzle or between the heat ray receiving part and the heat ray fixing part, or the gas may come out of the bag opening without entering the inside of the bag. Gas cannot be sufficiently filled into the bag, and furthermore, due to misalignment of the opening of the bag, wrinkles and poor welding are likely to occur at the welded portion of the bag.

Therefore, in the gas filling device of the above-mentioned publication, the opening of the bag placed over the nozzle is held by a clamp mechanism operated by an air cylinder or the like to prevent the bag from moving.

(Problems to be Solved by the Invention) As mentioned above, the conventional gas filling device uses a clamp mechanism operated by an air cylinder or the like to prevent the bag from moving, which is expensive. As the size increases, the structure becomes larger. In addition, since the upper end of the nozzle is bent horizontally to form the gas outlet, it is difficult to manufacture the nozzle, and since it is held by a clamp mechanism, it must be strong, making the nozzle expensive. It was hot. Furthermore, since the gas is directly ejected from the nozzle into the bag, the gas hits the packaged items in the bag with a strong ejection force, causing the packaged items to be displaced or scattered.

The present invention has been made in view of these problems, and it is possible to prevent the opening of the bag from moving due to gas ejection with a simple structure, and the nozzle also has a simple structure, so it can be constructed at low cost. It is an object of the present invention to provide a gas filling device that can reduce displacement and scattering of objects to be packaged in a bag.

[Structure of the invention]

(Means for Solving the Problems) The present invention has a hot wire receiving part 6 and a hot wire 29 which is disposed below the hot wire receiving part 6 so as to be movable up and down and is brought into contact with and away from the hot wire receiving part 6. a hot wire fixing part 8; a nozzle 34 provided with a gas outlet 33 disposed on the side of the hot wire fixing part 8 and ejecting gas upward;
It is provided on the side of the hot wire receiver 6, surrounds the top and side surfaces of the nozzle 34 between the hot wire receiver 6 and the side of the hot wire fixer 8, and connects the nozzle between the heat wire receiver 6 and the hot wire fixer 8. 34 and a bag holding member 15 that presses down the opening 38 of the bag 37 that is placed over the bag 34.

(Function) In the present invention, when the bag 37 is set, the nozzle 3
The opening 38 of the bag 37 placed over the bag 4 is pressed between the side surface of the hot wire fixing part 8 and the side surface of the hot wire fixing part 8 by the bag holding member 15.

Then, when gas is ejected from the gas outlet 33 of the nozzle 34, the gas flows between the bag pressing member 15 and the hot wire fixing part 8, and between the hot wire receiving part 6 and the hot wire fixing part 8.
It flows into the inside of the bag 37 through the gap between the two.

At this time, the bag holding member 15 prevents the opening 38 of the bag 37 from floating upward, and also prevents the tip of the opening 38 of the bag 37 from widening. Further, the gas ejected from the gas outlet 33 of the nozzle 34 is guided along the bag holding member 15 and flows into the inside of the bag 37 through between the heat ray receiver 6 and the heat ray fixing part 8. Furthermore, the gas ejected from the gas ejection port 33 of the nozzle 34
5, the gas flows into the bag 37, and hits the packaged items in the bag 37 while the ejection force of the gas is weakened.

(Example) Hereinafter, the configuration of an example of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a vacuum packaging machine, in which a vacuum container 2 for vacuum packaging an object to be packaged P is arranged at the top, and a vacuum pump (not shown) etc. is located.

The vacuum container 2 includes a lower container 3 having a peripheral wall 3a at the peripheral edge and an open upper surface, and a lower container 3 which is provided on the upper surface of the lower container 3 so as to be openable and closable, and the peripheral edge is crimped to the upper end of the peripheral wall 3a in an airtight state. The inside of the vacuum container 2 is composed of a lid 4, and the lid 4 closes the upper surface of the lower container 3. The inside of the vacuum container 2 is suctioned to a substantially vacuum state by a vacuum pump.
Note that the lid body 4 is made of, for example, a transparent material,
A raised portion 4a is provided at the center.

Further, 5 is a bag sealing device provided along one edge of the vacuum container 2, and this bag sealing device 5 is provided on the lower surface of the lid 4, as shown in FIGS. 2 and 3. A hot wire receiving part 6 and a hot wire fixing part 8 provided on the lower container 3 and supported by an elevating mechanism 7 are provided.

The heat ray receiving portion 6 is made of a rubber material and is provided in an elongated manner, and includes a holding frame 9 and a spacer 10 having a substantially U-shaped cross section.
It is fixed along one edge of the lid body 4 via. Furthermore, a base 12 of a bag presser metal fitting 11 is fixed between the holding frame 9 and the spacer 10, and a bag presser piece 13 is inclined downwardly inside the vacuum container 2 from the base 12 of the bag presser metal fitting 11. The tip of the bag presser piece 13 is located below the lower surface of the heat ray receiver 6. Further, a base 16 of a bag presser member 15 made of a transparent resin material is fixed to the side surface of the holding frame 9 facing the peripheral wall 3a of the lower container 3 by a set screw 14. base 1
A horizontal part 17 provided horizontally from 6 to the hot wire receiving part 6
and a vertical part 18 located on the side of the hot wire fixing part 8 via a nozzle 34 which will be described later.

The lifting mechanism 7 includes an annular O on the lower surface of the lower container 3.
It has a cylindrical container body 20 that is airtightly fixed via a ring 19, and a cylinder shaft 21 that penetrates the upper surface of the bottom plate 3b of the lower container 3 is arranged in the center of this container body 20 so as to be movable up and down. A piston 22 is fixed to the lower end of this cylinder shaft 21, and this piston 22
An O-ring 23 fitted around the outer periphery of the piston 22 is hermetically pressed against the inner peripheral surface of the container body 20, and a cylinder chamber 24 is formed between the upper surface of the piston 22 and the inside of the container body 20. Further, the piston 22 is urged downward by a spring 25 disposed within the cylinder chamber 24, and a stopper 26
downward movement is restricted by contacting with. Further, a cylinder suction port 27 communicating with the cylinder chamber 24 is provided on the outer side of the container body 20, and a vacuum pump is piped to the cylinder suction port 27 via a valve mechanism (not shown). Note that two lifting mechanisms 7 are provided along the length direction of the hot wire fixing part 8.

The hot wire fixing part 8 is formed of a non-conductive material into a flat plate shape and elongated, and is placed on the upper end of each cylinder shaft 21, 21 protruding from the bottom plate 3b of the lower container 3, and is attached to one edge of the lower container 3. A fitting hole 28 into which the cylinder shaft 21 is inserted is provided on the lower surface of the hot wire fixing portion 8 .

Further, an elongated strip-shaped hot wire 29 is arranged along the upper surface of the hot wire fixing part 8, and both ends of the hot wire 29 are fixed to approximately the center of the end surface of the hot wire fixing part 8 by fixing screws 30. Further, tension is applied to the hot wire 29 in the length direction by a tension mechanism 31 provided at the top of both end faces of the hot wire fixing part 8, and furthermore, a tension mechanism 31 provided at the top of both end faces of the hot wire fixing part 8 is applied to A lead wire 32 that is electrically connected to the end of the hot wire 29 is fixed, and current is applied to the hot wire 29 from the lead wire 32 .

A nozzle 34 having a flat gas outlet 33 at the upper end parallel to the hot wire fixing portion 8 is disposed between the side of the hot wire fixing portion 8 and the vertical portion 18 of the bag holding member 15. 34 has its lower end fixed to the bottom plate 3b of the lower container 3 by a connecting member 35, and a gas cylinder outside the vacuum packaging machine 1 is connected to this connecting member 35 via piping inside the body of the vacuum packaging machine 1.

In addition, on the bottom plate 3b of the lower container 3, there is a mounting table 3 on which the object to be packaged is placed when the object to be packaged is small.
6 is placed.

Next, the operation of this embodiment will be explained.

The item to be packaged is stored in a synthetic resin bag 37 with one end closed, placed on the mounting table 36 of the lower container 3 with the lid 4 open, and the opening 38 of the bag 37 is placed on the heat ray fixing part 8. and cover the nozzle 34, and cover the upper surface of the lower container 3 with the lid 4. With the lid 4 covered, the opening 38 of the bag 37 is pressed between the heat ray receiver 6 and the heat ray fixing part 8, and between the bag holding member 15 and the side of the heat ray fixing part 8. pressed down.

Then, the air inside the vacuum container 2 and the bag 37 is sucked into a vacuum using a vacuum pump, and then,
Gas is ejected from the gas ejection port 33 of the nozzle 34. This ejected gas flows into the inside of the bag 37 through between the bag holding member 15 and the hot wire fixing part 8 and between the heat wire receiving part 6 and the hot wire fixing part 8.

At this time, the bag holding member 15 prevents the opening 38 of the bag 37 from floating upward and also prevents the tip of the opening 38 of the bag 37 from widening. Further, the gas ejected from the gas spout 33 of the nozzle 34 is guided along the bag holding member 15 and passes between the heat ray receiver 6 and the heat ray fixing part 8 to the bag 3.
Furthermore, since the gas outlet 33 of the nozzle 34 is provided flatly, the gas flows smoothly into the interior of the bag 37. Further, the gas ejected from the gas ejection port 33 of the nozzle 34 hits the bag holding member 15 and then flows into the bag 37, and hits the packaged items in the bag 37 with the gas ejection force weakened. Misalignment and scattering of the packaged items can be reduced.

Next, by suctioning the air in the cylinder chamber 24 of the lifting mechanism 7 from the cylinder suction port, the piston 22 is pulled up against the spring 25, and the cylinder shaft 21 and the hot wire fixing part 8 are raised, and the hot wire fixing part The hot wire 29 of No. 8 is pressed against the hot wire receiving part 6 through the opening 38 of the bag 37, and the hot wire 29
By energizing 9, the surface temperature of the hot wire 29 rises and the opening 8 of the bag 37 is thermally welded.
The packaged items inside are sealed with gas inside.

When this gas is filled and sealed, the bag 37 expands inside the vacuum container 2 due to the gas jetting force, but the bag presser 11 suppresses the expansion of the opening 38 of the bag 37, so the bag presser 15 described above Along with this action, the displacement of the upper and lower edges of the welded portion of the opening 8 of the bag 37 can be reduced, and the occurrence of wrinkles and poor welding of the welded portion can be prevented.

Moreover, after welding is completed, inside the cylinder chamber 24,
By switching the valve mechanism, atmospheric air is sent from the cylinder suction port 27, and the piston 22 is pushed down by the elasticity of the spring 25, returning to its pre-operation state.
The cylinder shaft 21 and the hot wire fixing part 8 are lowered,
The hot wire 29 separates from the hot wire receiving portion 6.

Note that the ejection force of the gas ejected from the nozzle 34 is determined by the outflow pressure of the gas adjusted by the pressure regulator of the gas cylinder installed outside the vacuum packaging machine 1, and also by the pressure inside the vacuum packaging machine 1. It is determined by the diameter of the pipe, the diameter of the nozzle 34, and the shape of the gas outlet 33, and the degree of gas filling into the inside of the bag 37 can be adjusted. In the experiment, when the gas outflow pressure was 1 kg/cm ² , the diameter of the nozzle 34 was 10 mm and the width l (shown in Figure 2) of the gas outlet 33 was 2 mm.
It is possible to improve the degree of gas filling into the interior of the tube.

In addition, the piston 22
The vertical movement time can be adjusted as desired.

〔Effect of the invention〕

According to the present invention, a nozzle provided with a gas spout for ejecting gas upward is disposed on the side of the hot wire fixing part, and a nozzle with a gas spout for blowing gas upward is disposed on the side of the hot wire receiving part, and the upper surface of the nozzle and A bag holding member surrounding the side surface is provided, and the bag holding member prevents the opening of the bag from moving when gas is ejected from the gas outlet of the nozzle. Movement can be prevented with a simple configuration, and the nozzle can also be configured at a simple cost, making it possible to configure the device at low cost. Since the gas flows into the bag, the gas hits the packaged items in the bag in a state where the ejection force is weakened, and it is possible to reduce displacement and scattering of the packaged items in the bag.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the gas filling device of the present invention, FIG. 2 is a cross-sectional view of FIG.
The figure is a - sectional view of FIG. 1. 6... Heat wire receiving part, 8... Heat wire fixing part, 15...
Bag holding member, 29...heat wire, 33...gas outlet, 34...nozzle, 37...bag, 38...opening.

Claims (1)

[Scope of Claims] 1. A hot wire receiver, which is disposed below the hot wire receiver so as to be movable up and down,
A hot wire fixing part having a hot wire that is brought into contact with and separating from the heat wire receiving part; A nozzle that is disposed on a side of the hot wire fixing part and provided with a gas spout that spouts gas upward; and a side of the hot wire receiving part. a bag presser that is provided in the section, surrounds the top and side surfaces of the nozzle between the side surface of the heat wire fixing section, and presses the opening of the bag that is placed over the nozzle through the space between the heat wire receiving section and the heat wire fixing section; A gas filling device characterized by comprising a member. 2. The gas filling device according to claim 1, wherein the gas ejection port of the nozzle is formed flat in parallel with the hot wire fixing part.