JP2015117038A - Packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a food product in a packaging bag from jumping out by jetting gas from a gas filling tube into the packaging bag.SOLUTION: A packaging machine 10 includes: a chamber 12 housing a packaging bag housing a packaged object on the closing part side of a bottom; a gas filling tube 20 for filling gas from the opening of the packaging bag in the chamber 12; and a sealing device 30 provided in the chamber 12 and sealing the opening part peripheral edge of the packaging bag. The packaging bag is sealed by filling gas from the gas filling tube 20 into the packaging bag, and sealing the opening part peripheral edge of packaging bag with the sealing device 30. The gas filling tube 20 ejects gas toward a side face covering an interval between the closing part and the opening part of the packaging bag.

Description

  The present invention relates to a packaging machine that fills a packaging bag with a gas such as nitrogen gas and seals and seals it with a sealing device.

  Patent Document 1 discloses a packaging machine that seals a packaging bag containing an object to be packaged such as food. This packaging machine includes a chamber for housing a packaging bag, a sealing device that is provided in the chamber and seals the periphery of the opening of the packaging bag, and a vacuum pump that deaerates the inside of the chamber by a vacuum pump and makes the pressure negative. It has. When vacuum packaging the packaging bag, set the packaging bag containing the food in the chamber, deaerate the chamber with a vacuum pump to make it negative pressure, and then seal the periphery of the opening of the packaging bag with a sealing device Seal and seal the packaging bag.

  Further, in this packaging machine, when the pressure in the chamber is reduced to the atmospheric pressure from the negative pressure state, the vacuum-packed packaging bag is pushed to the atmospheric pressure and the packaged items such as food in the packaging bag may be crushed. there were. For this reason, the packaging machine is provided with a gas filling tube that fills the packaging bag accommodated in the chamber with an inert gas such as nitrogen gas, and after the inside of the chamber is made negative pressure, the periphery of the opening of the packaging bag Before sealing the packaging bag, an inert gas such as nitrogen gas is filled into the packaging bag from the gas filling tube. The active gas is not crushed to atmospheric pressure.

JP 2002-019723 A

  In the packaging machine as described above, the gas filling tube is inserted from the opening of the packaging bag set in the chamber to the periphery of the opening of the packaging bag, and the front end opening of the gas filling tube faces the closing portion side of the bottom of the packaging bag. It is like that. When a heavy food is stored in the packaging bag, the food in the packaging bag does not jump out of the packaging bag even if an inert gas is injected from the gas filling tube. On the other hand, when a light food such as shavings, tea leaves or chopped seaweed is accommodated in the packaging bag, the light food may jump out of the packaging bag due to the inert gas sprayed from the gas filling tube. In this case, the inside of the chamber is soiled by food scattered outside the packaging bag, and the inside of the chamber needs to be cleaned. In addition, if the scattered food remains on the periphery of the opening of the packaging bag, the periphery of the opening of the packaging bag may cause a sealing failure that cannot be sealed by the sealing device due to the food being caught. Further, when food comes out of the packaging bag, the weight of the food in the packaging bag weighed in advance changes, and the weight of the food may change for each packaging bag. An object of this invention is to prevent the foodstuff in a packaging bag from jumping out, even if gas is injected into a packaging bag from a gas filling pipe | tube.

  In order to solve the above-described problems, the present invention provides a chamber for storing a packaging bag containing an article to be packaged on the closed side of the bottom portion, and a gas filling tube provided in the chamber and filled with gas from the opening of the packaging bag. And a sealing device that is provided in the chamber and seals the periphery of the opening of the packaging bag, fills the packaging bag with gas from the gas filling tube, and seals the periphery of the opening of the packaging bag by the sealing device. In a packaging machine that stops and seals a packaging bag, the gas filling pipe provides a packaging machine characterized in that gas is discharged toward the side surface covering between the closed portion and the opening portion of the packaging bag. To do.

  In the packaging machine configured as described above, the gas filling tube discharges gas toward the side surface covering the space between the closing portion and the opening portion of the packaging bag. When the packaged item is stored, even if the gas is released from the gas filling tube into the packaging bag, the gas is not released directly toward the packaged item. Due to this, it became impossible to jump out.

  As one embodiment of the packaging machine configured as described above, when the tip of the gas filling tube faces the closing portion side of the packaging bag, the tip of the gas filling tube is closed and the circumference of the tip of the gas filling tube is closed. A gas discharge port may be formed on the surface.

  As another embodiment, when the front end opening of the gas filling tube faces the closing part side of the packaging bag, the gas discharged from the front end opening is on the closing part side of the packaging bag. Shielding means may be provided that prevent it from being released towards the surface. Further, when the front end opening of the gas filling tube faces the closing portion side of the packaging bag, the gas released from the front end opening is released toward the closing portion side of the packaging bag at the front end portion of the gas filling tube. When the shielding means is provided, the shielding means is preferably detachably attached to the gas filling tube or the chamber. In such a case, the object to be packaged in the packaging bag is heavy. In addition, when there is no possibility that the packaged item in the packaging bag will jump out due to the release of gas, the shielding means can be removed, and the gas can be efficiently released into the packaging bag without leaking outside from the gas filling tube.

  Furthermore, as another embodiment, the gas filling tube may be curved so that the tip opening faces the side surface of the packaging bag.

It is a perspective view of the vacuum packaging machine which is one Embodiment of the packaging machine of this invention. It is a perspective view of the longitudinal direction cross section along the front-back direction of FIG. It is the schematic which shows the piping which mainly connects a chamber and a vacuum pump of a vacuum packaging machine, a gas filling pipe, and gas supply piping. It is a block diagram which shows a control apparatus. It is sectional drawing in the chamber which shows the state which set the packaging bag. It is drawing equivalent to the enlarged view of FIG. 2 which shows other embodiment of a gas filling pipe | tube. It is drawing equivalent to the enlarged view of FIG. 2 which shows embodiment which attached the adapter pipe | tube part to the front-end | tip part of the horizontal part of a gas filling pipe | tube. It is drawing equivalent to the enlarged view of FIG. 2 which shows embodiment which attached the shielding means to the gas filling pipe | tube. It is a perspective view which shows other embodiment when a shielding means is made removable. It is a perspective view which shows other embodiment when a shielding means is made removable.

  Hereinafter, a vacuum packaging machine according to an embodiment of the packaging machine of the present invention will be described with reference to the accompanying drawings. As shown in FIGS. 1 and 2, the vacuum packaging machine 10 includes a chamber 12 that houses a packaging bag in an upper portion of a housing 11, and a gas that fills nitrogen gas (gas) from the opening of the packaging bag in the chamber 12. The filling tube 20, a heat sealing device (sealing device) 30 that seals the periphery of the opening of the packaging bag in the chamber 12, and the inside of the chamber 12 is degassed at the lower portion of the housing 11 to make negative pressure. And a vacuum pump 40.

  As shown in FIGS. 1 and 2, the chamber 12 has a shallow dish-shaped chamber base 13 having an open top surface, and a chamber cover 14 made of a pressure-resistant acrylic plate that covers the upper surface opening of the chamber base 13 so that it can be opened and closed. It is a pressure vessel composed of The chamber cover 14 is supported by the rear end portion of the housing 11 so as to be rotatable about a horizontal axis so that the front end side can move up and down. A rubber packing 15 is provided as a sealing member around the lower surface of the chamber cover 14, and the packing 15 hermetically seals the chamber cover 14 with respect to the chamber base 13. When the packaging bag is accommodated in the chamber 12, the packaging bag is accommodated so that the opening of the packaging bag is on the front side (so that the closing portion of the bottom of the packaging bag is on the rear side). Although the chamber 12 is a pressure vessel, the present invention is not limited to this, and the chamber 12 accommodates a packaging bag when the packaging machine seals the packaging bag without negative pressure in the chamber 12. A non-pressure-resistant container may be used.

  As shown in FIGS. 1 to 3, a pair of left and right gas filling pipes 20 are provided at the front portion of the chamber 12. The gas filling pipe 20 is made of a substantially L-shaped pipe member, and bends backward from the vertical portion 20a (shown in FIGS. 3 and 5) that rises vertically at the front portion in the housing 11 and from the upper end of the vertical portion 20a. And a horizontal portion 20b extending rearward through the front wall of the chamber base 13. As shown in FIGS. 3 and 5, one end of the gas supply pipe 22 is connected to the lower end of the vertical portion 20 a of the gas filling pipe 20, and the other end of the gas supply pipe 22 is connected to the housing 11. A nitrogen gas cylinder (not shown) provided outside is connected. The gas supply pipe 22 is provided with a gas opening / closing valve 23 made of an electromagnetic valve. The nitrogen gas in the nitrogen gas cylinder opens the gas opening / closing valve 23 to open the gas filling pipe 20. Is injected from. The horizontal portion 20b of the gas filling tube 20 extends backward in the chamber 12 so that the tip is on the rear side. The front end of the horizontal portion 20b of the gas filling tube 20 is closed, and gas discharge ports 21 for releasing nitrogen gas are formed on the left and right side surfaces (peripheral surfaces) of the front end portion of the horizontal portion 20b. When the horizontal portion 20b of the gas filling tube 20 is inserted into the periphery of the opening in the packaging bag, the gas discharge port 21 is a side surface of the opening periphery of the packaging bag (a side surface that covers the space between the closing portion and the opening of the packaging bag). ) Facing side.

  As shown in FIGS. 1 to 3, a heat sealing device 30 is provided at the rear of the gas filling pipe 20 at the front of the chamber 12. The heat sealing device 30 seals the opening peripheral edge portion of the packaging bag accommodated in the chamber 12 and capable of being thermally welded. Note that the packaging bag uses a thermoplastic resin film having a two-layer structure that employs a material having a low melting point on the inside. The heat sealing device 30 includes lower and upper narrow pressure blocks 31 and 32 that hold the periphery of the opening of the packaging bag with a narrow pressure. The lower narrow pressure block 31 is made of an aluminum square pipe member, and is detachably attached to the front portion of the chamber base 13 and is movable up and down. On the upper surface of the lower narrow pressure block 31, a belt-like heater 33 made of a nichrome material is provided. The upper narrow pressure block 32 is made of an elastically deformable silicon block, and is provided on the lower surface front portion of the chamber cover 14 at a position facing the upper side of the lower narrow pressure block 31.

  As shown in FIGS. 2 and 3, a pair of left and right lifting mechanisms 34 (only the right side is shown in the figure) are provided at the front of the chamber base 13 to raise and lower the lower narrow pressure block 31 up and down. The elevating mechanism 34 includes a pair of left and right support shafts 35 that penetrate the bottom wall of the front portion of the chamber base 13. These support shafts 35 support the lower narrow pressure block 31 at the front portion of the chamber base 13 so as to be movable up and down. The support shafts 35 are inserted at the lower ends of the lower narrow pressure blocks 31, and the support shafts 35 are vertically moved by a pair of right and left lifting cylinders 36 whose middle portion in the vertical direction is provided at the front lower surface of the chamber base 13. Is supported so as to be movable. A flange portion 36a is provided in the lift cylinder 36 at an intermediate portion of the support shaft 35. The flange portion 36a partitions the lift cylinder 36 into an upper space 36b and a lower space 36c in an airtight manner. In the upper space 36b of the elevating cylinder 36, a spring 36d is interposed on the outer periphery of the support shaft 35, and the spring 36d urges the support shaft 35 downward via the flange 36a.

  As shown in FIGS. 2 and 3, an oil circulation type vacuum pump 40 is provided in the housing 11. As shown in FIG. 3, a suction pipe (suction path) 41 for connecting the vacuum pump 40 and the chamber 12 is provided in the housing 11, and a vacuum valve 42 for opening and closing the suction pipe 41 is provided in the housing 11. It has been. The suction pipe 41 is connected to an atmosphere introduction pipe 43 for introducing the atmosphere between the chamber 12 and the vacuum valve 42. The air introduction pipe 43 includes a first pipe part 43a and a second pipe part 43b branched from the first pipe part 43a. The first and second pipe parts 43a and 43b are opened and closed by first and second parts. Atmospheric introduction valves 44 and 45 are provided. The first pipe portion 43a is formed to have a diameter larger than that of the second pipe portion 43b. When the first atmosphere introduction valve 44 is opened, the atmosphere is quickly introduced into the chamber 12, and when the second atmosphere introduction valve 45 is opened. The atmosphere is slowly introduced into the chamber 12.

  A pressure detection pipe 46 is connected to the suction pipe 41 via a first pipe portion 43 a of the atmosphere introduction pipe 43, and a vacuum gauge 47 for detecting the pressure of the chamber 12 is provided in the pressure detection pipe 46. When the inside of the chamber 12 is not deaerated by the vacuum pump 40, the pressure in the chamber 12 detected by the vacuum gauge 47 is 101 kPa (abs), which is the same as the atmospheric pressure, and the degree of vacuum at this time is 0%. When the inside of the chamber 12 is degassed by the vacuum pump 40 to make it negative pressure, and the pressure in the chamber detected by the vacuum gauge 47 is 0 kPa (abs), the degree of vacuum is 100%. In the following description, when the pressure is displayed, the description of (abs) is omitted.

  A cylinder pipe 48 branches from the vacuum pump 40 and the vacuum valve 42 to the suction pipe 41, and the cylinder pipe 48 is connected to the upper space 36 b of the elevating cylinder 36. The cylinder pipe 48 includes a first pipe part 48a branched from the suction pipe 41 and a second pipe part 48b connected to the upper space 36b of the elevating cylinder 36. Between the first and second pipe parts 48a and 48b, the cylinder pipe 48 is provided. Is provided with a cylinder valve 49 comprising a three-way valve. An air introduction pipe 49 a is further connected to the cylinder valve 49. The cylinder valve 49 is in a state where the first and second pipe portions 48a and 48b are in communication with each other, or in a state in which the tip of the first pipe portion 48a is closed and the second pipe portion 48b and the atmosphere introduction pipe 49a are in communication connection. .

  The vacuum packaging machine 10 includes a control device 50. As shown in FIG. 4, the control device 50 includes a gas on-off valve 23, a heater 33, a vacuum pump 40, a vacuum valve 42, a first and a first valve. 2 Connected to the atmosphere introduction valves 44 and 45, the vacuum gauge 47, the cylinder valve 49, and the operation panel 51. The control device 50 includes a microcomputer (not shown), and the microcomputer includes a CPU, a RAM, a ROM, and a timer (all not shown) connected via a bus. The control device 50 is provided with various packaging programs for packaging an object to be packaged in the chamber 12 in the ROM. When the packaging program selected by the operation panel 51 is executed, the gas opening / closing is performed based on the detection of the vacuum gauge 47. The operation of the valve 23, the heater 33, the vacuum pump 40, the vacuum valve 42, the first atmosphere introduction valve 44 (and the second atmosphere introduction valve 45 if necessary), and the cylinder valve 49 are controlled, and the chamber 12 to be packaged.

  In the vacuum packaging machine 10 configured as described above, when the packaging bag is sealed in a state where the packaging bag is filled with nitrogen gas, as shown in FIG. The packaging bag is inserted from the opening of the packaging bag B to the periphery of the opening of the packaging bag B, and the opening periphery of the packaging bag B is placed on the upper side of the lower narrow pressure block 31 on the rear side of the gas filling tube 20. B is placed on the chamber base 13 and set. At this time, the opening of the packaging bag B is set at the front portion of the chamber 12, and the closing portion at the bottom is set at the rear portion of the chamber 12. Further, the tip of the horizontal portion 20b of the gas filling tube 20 faces the closing portion of the bottom portion of the packaging bag B, and the gas discharge port 21 formed on the peripheral surface of the horizontal portion 20b is the side surface of the periphery of the opening portion of the packaging bag B. Facing.

  When the packaging bag B is set in the chamber 12 and then the upper surface opening of the chamber base 13 is closed by the chamber cover 14, the packaging program selected by the operation panel 51 is started. The control device 50 opens the vacuum valve 42 from a state in which all the valves 23, 42, 44, 45 are closed and a state in which the cylinder valve 49 communicates and connects the second pipe portion 48b and the atmosphere introduction pipe 49a. The vacuum pump 40 is operated to evacuate the inside of the chamber 12 to make it a negative pressure. When the pressure in the chamber 12 detected by the vacuum gauge 47 reaches 0.5 kPa (the degree of vacuum is 99.5%) as a predetermined pressure, the vacuum valve 42 is closed and the gas on-off valve 23 is opened for a predetermined time. Then, nitrogen gas is injected into the packaging bag B from the discharge port 21 of the gas filling tube 20 and filled.

  After filling the packaging bag B with nitrogen gas, the controller 50 causes the first and second pipe portions 48a and 48b to communicate with each other so that the cylinder valve 49 communicates with the upper space 36b of the left and right lifting cylinders 36. By causing pressure, the left and right support shafts 35 are raised, the lower narrow pressure block 31 is raised to the raised position, and the upper narrow pressure block 32 is pressed. In this state, when the control device 50 energizes the heater 33 to generate heat, the peripheral edge of the opening of the packaging bag held tightly by the lower and upper narrow pressure blocks 31 and 32 is thermally welded and sealed. The Thereafter, the control device 50 stops the operation of the vacuum pump 40 and opens the first atmosphere introduction valve 44 (and the second atmosphere introduction valve 45 as necessary) to introduce the atmosphere into the chamber 12. The inside of the chamber 12 is returned to atmospheric pressure, and the cylinder valve 49 is supported by introducing the atmosphere into the upper space 36b of the elevating cylinder 36 so that the second pipe portion 48b and the atmosphere introduction pipe 49a are connected in communication. The shaft 35 is lowered by the spring 36d, and the lower narrow pressure block 31 is returned to the lowered position.

  The vacuum packaging machine 10 configured as described above includes a chamber 12 that houses a packaging bag containing food and other items to be packaged on the closed side of the bottom, and nitrogen gas is filled in the chamber 12 from the opening of the packaging bag. A gas filling tube 20 for heating, and a heat sealing device 30 provided in the chamber 12 for sealing the periphery of the opening of the packaging bag. The vacuum packaging machine 10 was filled with nitrogen gas into the packaging bag from the gas filling tube 20, and the opening peripheral edge of the packaging bag was sealed by the heat sealing device 30 to seal the packaging bag. In this vacuum packaging machine 10, the gas filling tube 20 discharges gas toward the side surface (the side surface covering the space between the closing portion and the opening portion) of the opening portion of the packaging bag. Specifically, the tip of the horizontal portion 20b of the gas filling tube 20 faces the closing portion side of the bottom of the packaging bag, but the tip of the horizontal portion 20b of the gas filling tube 20 is closed, and the gas filling tube 20 A nitrogen gas discharge port 21 is formed on the peripheral surface of the tip of the horizontal portion 20b. As a result, even when nitrogen gas is released from the gas filling tube 20 when lightweight food such as shavings, tea leaves or chopped seaweed is stored in the packaging bag, nitrogen gas is not directly released toward the lightweight food. The lightweight food in the packaging bag is no longer popped out by the released gas. As described above, even when nitrogen gas is released into the packaging bag, the food does not jump out of the packaging bag, so that the chamber 12 is not contaminated by the food scattered outside the packaging bag. Further, since the food does not scatter to the periphery of the opening of the packaging bag due to the release of nitrogen gas, it was possible to prevent the periphery of the opening of the packaging bag from becoming a seal failure that cannot be sealed due to the food being caught. Furthermore, since the food no longer scatters from the packaging bag, the weight of the food in the packaging bag weighed in advance can be prevented from changing for each packaging bag.

  In this embodiment, the discharge ports 21 are formed on the left and right side surfaces of the distal end portion of the horizontal portion 20b of the gas filling tube 20. However, as shown in FIG. In addition to the left and right side surfaces of the tip of the unit, the discharge ports 21 may be formed on the top and bottom surfaces. Further, as shown in FIG. 7, the tip of the horizontal portion 20b of the gas filling tube 20 is opened, and the adapter tube portion 20c whose tip is closed is detachably fitted and fixed to the tip of the horizontal portion 20b. In addition, the discharge port 21 may be formed on the left and right side surfaces (peripheral surfaces) of the adapter pipe portion 20c instead of the tip portion of the horizontal portion 20b. In such a case, when heavy food is stored in the packaging bag, the adapter tube portion 20c is removed, and nitrogen gas is released vigorously and efficiently from the front end opening of the horizontal portion 20b toward the bottom portion of the packaging bag. Thus, when lightweight food is stored in the packaging bag, the adapter tube portion 20c may be attached, and nitrogen gas may be released from the discharge port 21 of the adapter tube portion 20c.

  As another embodiment, as shown in FIG. 8, when the front end opening of the horizontal portion 20b of the gas filling tube 20 faces the closing portion side of the bottom of the packaging bag, the horizontal portion 20b of the gas filling tube 20 A shield plate (shielding means) 24 that prevents the nitrogen gas from being released toward the closed portion side of the bottom of the packaging bag is provided at the tip, and the nitrogen gas released from the tip opening of the gas filling tube 20 is You may make it guide toward the side surface of an opening part periphery. Furthermore, the front end portion of the horizontal portion 20b of the gas filling tube 20 may be curved in the left-right direction so that the front end opening of the gas filling tube 20 is guided toward the side surface of the opening portion periphery of the packaging bag.

  Further, as shown in FIG. 8, when the front end opening of the horizontal portion 20b of the gas filling tube 20 faces the closing portion side of the bottom portion of the packaging bag, the front end portion of the horizontal portion 20b of the gas filling tube 20 is When the shielding plate 24 that prevents the release of nitrogen gas toward the closing portion side of the bottom of the packaging bag is provided, the nitrogen gas injected from the front end opening of the horizontal portion 20b of the gas filling tube 20 is caused by the shielding plate 24. Since the momentum is weakened and flows in the lateral direction (the side of the peripheral edge of the opening of the packaging bag), the lightweight food in the packaging bag does not pop out. However, in order to sufficiently fill the packaging bag with nitrogen gas, the packaging bag needs to be greatly inflated. However, by providing the shielding plate 24 at the tip of the gas filling tube 20, the packaging bag is injected into the packaging bag. Nitrogen gas must be released in order to weaken the momentum of nitrogen gas and expand the packaging bag. Therefore, when the food in the packaging bag is not lightweight and the food in the packaging bag does not scatter even when nitrogen gas is injected from the gas filling tube 20 toward the closing portion of the bottom of the packaging bag, FIG. 9 and FIG. As described above, it is preferable that the shielding means is detachable from the gas filling tube 20 or the chamber 12.

  The shielding means 24A shown in FIG. 9 (a) inserts the gas filling pipe 20 into the mounting holes 24Aa1 made of two through holes formed on the left and right sides of the mounting plate portion 24Aa, and from the upper edge of the mounting plate portion 24Aa. A shielding portion 24Ab that extends rearward from the upper side of the horizontal portion 20b of the gas filling tube 20 and guides the gas injected from the tip opening in the lateral direction behind the tip opening of the horizontal portion 20b of the gas filling tube 20. I have. When this shielding means 24A is attached to the gas filling tube 20, the gas filling tube 20 is inserted through the through hole 24Aa1 of the attachment plate portion 24Aa until the attachment plate portion 24Aa comes into contact with the front wall of the chamber base 13. On the other hand, when removing the shielding means 24A from the gas filling tube 20, the mounting plate portion 24Aa is pulled out from the gas filling tube 20.

  Further, the shielding means 24B shown in FIG. 9B is provided with a rubber bush 25B around the mounting hole 24Aa1 in FIG. 9A, and is attached to and detached from the gas filling tube 20 via the bush 25B. I tried to attach it as possible. Further, the shielding means 24C shown in FIG. 9 (c) has the same configuration as the shielding means 24A shown mainly in FIG. 9 (a), and in the vertical direction at the base end portion of the horizontal portion 20b of the gas filling tube 20. An extending mounting slit 20d is provided, and both left and right ends of the mounting plate portion 24Ca are detachably engaged with the mounting slit 20d. Further, the shielding means 24D shown in FIG. 9D has the same configuration as the shielding means 24A mainly shown in FIG. 9A and is installed at the front portion of the chamber base 13.

  In such a case, when there is no possibility that the food in the packaging bag jumps out by the injection (release) of nitrogen gas, such as when heavy food is stored in the packaging bag, the shielding means 24A to 24D are removed. The gas can be efficiently discharged into the packaging bag without leaking outside from the opening at the front end of the horizontal portion 20b of the gas filling tube 20. Further, when there is a possibility that the food in the packaging bag may pop out due to the injection (release) of nitrogen gas, such as when a lightweight food is stored in the packaging bag, the shielding means 24A to 24D are attached and the gas filling tube 20 is attached. The nitrogen gas injected (released) from the opening at the front end of the horizontal portion 20b toward the closing portion at the bottom of the packaging bag is caused to flow in the lateral direction (the side of the peripheral edge of the opening of the packaging bag) so that the food in the packaging bag It can be prevented from jumping out. Further, since the shielding means 24A to 24D can be attached to and detached from the gas filling tube 20 or the chamber 12, the shielding means 24A to 24D are removed even if foreign matter adheres to the front end opening of the horizontal portion 20b of the gas filling tube 20. As a result, it was possible to easily remove the foreign matter at the front end opening of the horizontal portion 20b of the gas filling tube 20.

  In addition, although embodiment which attaches a shielding means to the front-end | tip part of the gas filling pipe | tube 20 detachably in FIG. 9 was illustrated, it is not restricted to this, As shown in FIG. 10, the horizontal part of the gas filling pipe | tube 20 is shown. An adapter tube portion 24Ea that is detachably fitted and fixed to the tip portion of 20b, and a nitrogen gas that is fixed to the tip portion of the adapter tube portion 24Ea and released from the gas filling tube 20 through the adapter tube portion 24Ea in the lateral direction The shielding means 24E composed of the shielding plate portion 24Eb that guides the light may be used, and the same function and effect can be obtained even when this is done.

  Although the vacuum packaging machine 10 has been described as an embodiment of the packaging machine of the present invention, the present invention is not limited to this and the packaging bag is sealed by the sealing device 30 without negative pressure in the chamber 12. The present invention is also applied to a packaging machine that seals the same, and similar effects can be obtained even in such a case.

 DESCRIPTION OF SYMBOLS 10 ... Packaging machine (vacuum packaging machine), 12 ... Chamber, 20 ... Gas filling pipe, 21 ... Release port, 24-24E ... Shielding means, 30 ... Sealing device (heating sealing device).

Claims (5)

A chamber for storing a packaging bag storing an article to be packaged on the closed side of the bottom,
A gas filling tube provided in the chamber and filled with gas from the opening of the packaging bag;
A sealing device provided in the chamber for sealing the periphery of the opening of the packaging bag;
In the packaging machine for filling the gas into the packaging bag from the gas filling tube, sealing the periphery of the opening of the packaging bag by the sealing device, and sealing the packaging bag,
The packaging machine according to claim 1, wherein the gas filling tube discharges gas toward a side surface covering a space between the closing portion and the opening portion of the packaging bag. The packaging machine according to claim 1,
When the front end of the gas filling tube faces the closing portion side of the packaging bag, the front end of the gas filling tube is closed to form a gas discharge port on the peripheral surface of the front end portion of the gas filling tube. A packaging machine featuring. The packaging machine according to claim 1,
When the front end opening of the gas filling tube faces the closing portion side of the packaging bag, the gas released from the front end opening is released toward the closing portion side of the packaging bag at the front end portion of the gas filling tube. A wrapping machine provided with shielding means for preventing it from being done. In the packaging machine according to claim 3,
A packaging machine, wherein the shielding means is detachably attached to the gas filling tube or the chamber. The packaging machine according to claim 1,
The packaging machine characterized in that the gas filling pipe is curved so that a front end opening faces a side surface of the packaging bag.

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