JP3742042B2 - Inert gas filling method in packaging machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an inert gas filling method in a gas filling packaging machine.
[0002]
[Prior art]
Japanese Patent Publication No. 57-29332 discloses an inert gas filling method in a conventional packaging machine according to the present applicant. This “inert gas filling method for a packaging bag” is applied to a gas filling and packaging apparatus in which two of a packaged filling apparatus and an inert gas filling apparatus are connected to a common machine base. Japanese Patent Publication No. 58-52890 discloses a packaging machine in which a packaging bag is supported by a grip pair provided on a rotary table and intermittently transported, and a packaging machine for filling an object to be packaged during the transportation, and packaging. Two devices of a gas filling device including a gas filling nozzle and a bag mouth heat seal means, which are configured to be intermittently transported while being supported by a pair of sandwiching plates provided on a rotary table, An “apparatus for performing gas filling and sealing for wrapping machine linking” that performs adjacent continuation as a delivery process for each stop process is disclosed.
[0003]
[Problems to be solved by the invention]
The above-described conventional method for filling an inert gas into a packaging bag and a gas-filled packaging device to which this method is applied are both composed of a device for filling a package and an inert gas filling device, and each has a grip pair. The rotating table and the rotating table provided with the sandwiching plate and the welding bar have a complicated structure that is intermittently driven by a separate driving mechanism. For this reason, not only the whole apparatus became large, but the manufacturing cost was high. Moreover, in order to install the gas filling packaging apparatus, a large space was required.
[0004]
An object of the present invention is to use a single intermittent rotary table for filling a package bag with an article to be packaged and an inert gas and sealing the bag mouth, and is effective in reducing the size and manufacturing cost. An object of the present invention is to provide an inert gas filling method in a packaging machine.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a rotating body provided with a number of grip pairs in a radial direction is intermittently stopped and moved by a plurality of processes by intermittent drive means, and suspended by each grip pair. In a packaging machine in which a predetermined amount of an article to be packaged is filled in a packaging bag supported in a lowered shape, and then the bag mouth is sealed and then released from the machine.
The rotating body is provided with filling funnels arranged so as to correspond to the respective grip pairs so as to be movable in the vertical direction, gas filling nozzles are respectively provided on the filling funnels, and the filling funnel is provided in a previous step of the filling step. The gas drop nozzle and the gas filling nozzle are inserted into the packaging bag through the opened bag mouth, and the packaging object is charged into the packaging bag in the filling process, and the inert gas is ejected from the filling nozzle for packaging. The bag is shaken by vibration means to promote the replacement action of the inert gas and the air in the bag, the gap between the grip pair is widened in the subsequent step of the filling step, and the bag mouth is linearly tensioned. It is made to escape from a packaging bag in order of the dropping port of a filling funnel, and a gas filling nozzle.
[0006]
In order to achieve the same object, the invention described in claim 2 is the method of filling inert gas in the packaging machine according to claim 1, wherein the lower end of the gas filling nozzle is lower than the dropping port of the filling funnel. Is also provided so as to protrude downward.
[0007]
In order to achieve the same object, the invention described in claim 3 is substantially the same as the inert gas filling method in the packaging machine according to claim 1 or 2, when the gas filling nozzle is inserted into the packaging bag. At the same time, an inert gas is ejected from the nozzle.
[000 8 ]
【The invention's effect】
According to the inert gas filling method in this packaging machine, by using a single intermittent rotary table to fill the packaging bag with the article to be packaged and the inert gas and to seal the bag mouth, It is possible to reduce the size and manufacturing cost of the filling and packaging machine. In addition, the downsizing of the packaging machine has the advantage of requiring less installation space.
[00 09 ]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a gas filling and packaging machine to which an inert gas filling method is applied in the packaging machine of the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is a side view showing a configuration of a rotating body, a filling funnel and its periphery. FIG. 4 is a developed view of the cam rail showing the relative relationship between the filling funnel and gas filling nozzle and the packaging bag in all steps.
[00 10 ]
A gas filling packaging machine P to which the “inert gas filling method in a packaging machine” of the present invention is applied is shown in FIGS. As shown in FIG. 2, the rotary type packaging machine P includes a weighing device (not shown), an inert gas supply device 70, and the like. Detecting process (b), printing process such as expiration date (c), opening process of packaging bag (d), filling process of packaged objects such as butter peanuts (e), vibration process (e) to (g) , The empty bag discharging step (h), the bag mouth seal and the step of detecting the biting of the article to be packaged into the seal portion (re), the sealing portion cooling and the product discharging step (nu). The method for filling an inert gas such as nitrogen gas into the packaging bag is described in detail below, but is performed from the filling step (e) to the vibration steps (e) to (g).
[00 11 ]
On the machine base 1 of the packaging machine P, there is provided a stand 3 that freely supports a longitudinal intermittent rotating shaft 2, and a disk-shaped rotating body 4 attached to the intermittent rotating shaft 2 has a bag mouth b Only 10 grip pairs g (as many as the number of steps) for gripping or releasing the opened packaging bag a are provided so as to protrude radially at equal angular intervals. The bag feeding apparatus 10 arranged in the bag feeding step (A) separates a large number of packaging bags a stacked on the supply table 11 one by one from above by a suction means provided with a suction cup (not shown). It is a known structure that is supplied to the grip pair g in a state of being suspended with the bag mouth b facing up.
[00 12 ]
As shown in FIG. 3, a pair of guide bars 15, 15 are erected in parallel on the outer peripheral edge 4 a of the rotating body 4 so as to correspond to the center position of each grip pair g. The upper ends of the guide bars 15 are attached to the ring plate 16. Reference numeral 17 denotes a slide plate in which rollers 18 are arranged at four positions, up, down, left, and right. The slide plate 17 is mounted on the guide bars 15 and 15 from the outside so that the rollers 18 can move in the vertical direction. A bracket 19 provided on the filling funnel 21 is attached to the front surface of the slide plate 17. Further, a cam roller 20 is provided to project freely at the center of the back surface of the slide plate 17.
[00 13 ]
About the said filling funnel 21, the same number as the number of processes is provided. Further, gas filling nozzles 23 are provided on the side surfaces 21a of the filling funnels 21 respectively. The gas filling nozzles 23 are arranged so that the lower end 24 protrudes below the dropping port 22 of the filling funnel 21 by an appropriate size.
[00 14 ]
A boss 7 is rotatably provided at the upper end of the intermittent rotation shaft 2 by a bearing 6. A drum 25 is fixed to the boss 7 directly above the rotating body 4 and concentrically with the intermittent rotating shaft 2. On the outer surface of the drum 25, as shown in FIG. 4, the cam surfaces of the lower cam rails 26, 27 and the upper cam rails 29, 30 are formed so as to form cam grooves 31 with a predetermined interval. It is arranged to face each other. The cam roller 20 of the slide plate 17 is inserted into the cam groove 31 so that the slide plate 17 is supported by the lower cam rails 26 and 27. Thus, the cam roller 20 of each slide plate 17 rolls on the lower cam rails 26 and 27 by the intermittent rotation of the rotating body 4 so that the filling funnel 21 and the gas filling nozzle 23 move in the vertical direction. Configured.
[00 15 ]
A rectangular guide bar 34 is erected at the position of the packaging bag opening step (d) inside the drum 25 so that the slider 35 is freely movably fitted. It can be moved up and down by lifting means (not shown). A support piece 36 for receiving the cam roller 20 of the slide plate 17 is provided on the front surface of the slider 35.
[00 16 ]
Note that a mechanism for raising and lowering the above-mentioned many filling funnels by a cam rail provided around a fixed drum and a slider mechanism for raising and lowering the filling funnel in a specific process are disclosed in Japanese Patent No. 2884064 owned by the present applicant. It is configured according to the contents.
[00 17 ]
Reference numeral 40 denotes a rotary valve disposed on the drum 25. The rotary valve 40 includes a central valve shaft 40a that is fixed to the drum 25 side, and a ring-shaped valve body 41 that is rotatably mounted on the valve shaft 40a. The valve body 41 is provided with the same number of steps, that is, ten gas supply holes (not shown) so as to communicate with the gas passage of the valve shaft. The valve body 41 is connected to the ring plate 16 by stays 43, 43 and is provided so as to rotate together with the rotating body 4.
[00 18 ]
The gas supply hole and the gas filling nozzle 23 are connected to each other by a flexible tube 44. Further, an inert gas such as nitrogen gas and carbon dioxide gas adjusted to a predetermined pressure (0.1 to 0.3 MPa) is supplied from the inert gas supply device 70 to the valve shaft 40a of the rotary valve 40 by the hose 51. It is provided to do.
[00 19 ]
The inert gas supply system is configured in accordance with the contents disclosed in Japanese Patent No. 2619795 owned by the present applicant.
The gas filling packaging machine P is comprised by the above.
[00 20 ]
Next, the “inert gas filling method in the packaging machine” of the present invention will be described in detail in connection with the operation of the gas filling packaging machine P.
(1) In the bag supply step (A), the packaging bag a is supplied to the grip pair g in a state of being suspended with the bag mouth b facing up. Whether or not the packaging bag a is gripped at a predetermined height by the grip pair g is checked in the step (b) of detecting the gripping and gripping height of the packaging bag, and the printing step (c) In Fig. 2, the expiration date and the like are printed by a known printing device 50.
(2) In the packaging bag opening step (d), the packaging bag a has its front and back surfaces adsorbed by a suction cup by a known opening device 55 to open the bag mouth b, and keeps the bag mouth b open. A pair of opening and closing pieces 56 are inserted and opened in a substantially C shape.
(3) On the other hand, when the cam roller 20 of the slide plate 17 is transferred from the lower cam rail 26 to the support piece 36 of the slider 35 that is waiting at the raised position, the slider 35 is lowered. Thereby, the drop port 22 of the filling funnel 21 and the lower end 24 of the gas filling nozzle 23 are inserted into the packaging bag a.
The opening / closing piece 56 of the opening device 55 is moved up after the filling funnel 21 is inserted and returned to the original V-shaped closed state.
(4) Next, due to the intermittent rotational movement of the rotating body 4, the cam roller 20 of the slide plate 17 is transferred from the support piece 36 of the slider 35 in the lowered state to the cam rail 27, and the packaging bag a is filled with a package ( E) is intermittently transferred. Thus, a predetermined amount of the object to be packaged is discharged into the filling funnel 21 and filled in the packaging bag a by a weighing device (not shown). At the same time, the ejection of the inert gas from the gas filling nozzle 23 is started, and the inert gas which is continuously supplied and diffused while shaking the packaging bag a back and forth by the vibration means (not shown) and the inside of the bag. Promotes the replacement action with air.
(4) In the vibration step (f), the gap between the grip pair g is widened and the bag mouth b is tensioned linearly to prevent outside air from entering the packaging bag a. On the other hand, the sliding plate 17 is gradually raised by the intermittent rotation of the rotating body 4, and only the drop port 22 of the filling funnel 21 escapes from the packaging bag a while leaving the lower end 24 of the gas filling nozzle 23 in the packaging bag a. To do.
In addition, about the shaking operation | movement of the packaging bag a, it performs in three processes, a filling process (e), a vibration process (f), and a vibration process (g).
(5) In the empty bag discharging step (h), the packaging bag a that has not been filled with the packaged object in the previous step or the packaging bag a that has a poor gripping height or gripping height is operated by releasing the grip pair g. Discharged outside. On the other hand, at the end of this step, the gas filling nozzle 23 completely escapes the lower end 24 from the packaging bag a while injecting an inert gas.
(6) In the step (i) of detecting the bite of the package into the bag mouth seal and the seal part, it is detected whether or not there is the bite of the package into the seal part of the packaging bag a. About the packaging bag a without a dent, the sealing device 60 heat-seals the bag mouth b.
(7) Next, in the cooling of the seal portion and the product discharge step (No.), after the cooling of the heat seal portion applied in the previous step is performed by the seal cooling device 65, the packaging bag a is released by releasing the grip pair g. Released outside the aircraft.
In addition, about the packaging bag a by which the biting of the to-be-packaged object to the seal part was detected at the front process, it discharge | releases to the path | routes different from the normal packaging bag a at this process, without performing a heat seal.
[00 21 ]
In the above embodiment, the inert gas is ejected into the packaging bag in the filling step (e). When the gas filling nozzle 23 is inserted into the packaging bag a in the opening step (d), the inert gas is injected. It is also possible to control to eject.
In addition, about the residual oxygen amount in the packaging bag by the inert gas filling method of this invention, it was 0.1 to 1 percent (medium substitution rate).
[00 22 ]
As described above, since the inert gas filling method in this packaging machine is configured to perform filling of the packaging bag and the inert gas into the packaging bag and sealing the bag mouth using one intermittent rotary table, There is an advantage that the gas filling and packaging machine can be downsized and the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a side view of a gas filling and packaging machine to which an inert gas filling method is applied in the packaging machine of the present invention. FIG. 2 is a plan view of the same. FIG. 3 shows a configuration of a rotating body, a filling funnel and its surroundings. Side view [Figure 4] Cam rail development showing the relative relationship between the filling funnel and gas filling nozzle and the packaging bag throughout the entire process [Explanation of symbols]
P ... Gas filling packaging machine g ... Grip pair a ... Packaging bag b ... Bag opening 4 ... Rotating body 15 ... Guide bar 17 ... Slide plate 20 ... Cam roller 21 ... Filling funnel 22 ... Falling port 23 ... Gas filling nozzle 24 ... Lower end 25 ... Drums 26, 27 ... Lower cam rails 29,30 ... Upper cam rails 35 ... Slider 36 ... support piece 70 ... inert gas supply device

Claims (3)

A rotating body provided with a large number of grip pairs in the radial direction is intermittently stopped and moved at intervals of a plurality of steps by intermittent drive means, and a predetermined amount of objects to be packaged is placed on a packaging bag supported in a suspended manner by each grip pair. In a packaging machine that, after filling, seals the bag mouth and then discharges the packaging bag outside the machine,
The rotating body is provided with a filling funnel arranged to correspond to each grip pair so as to be movable in the vertical direction, and a gas filling nozzle is provided on each of the filling funnels,
Insert the dropping port of the filling funnel and the gas filling nozzle into the packaging bag from the opened bag mouth in the previous step of the filling step,
In the filling process, the material to be packaged is charged and filled in the packaging bag, and the inert gas and the air in the bag are promoted by shaking the packaging bag by vibrating means while injecting the inert gas from the filling nozzle. Let
In the subsequent process of the filling process, the gap between the grip pairs is expanded and the bag mouth is tensioned in a straight line, and then the drop port of the filling funnel and the gas filling nozzle are allowed to escape from the packaging bag in this order. An inert gas filling method in a packaging machine.   The inert gas filling method in the packaging machine according to claim 1, wherein the gas filling nozzle is provided so that a lower end thereof protrudes downward from a dropping port of the filling funnel. 3. An inert gas filling method in a packaging machine according to claim 1, wherein the inert gas is ejected from the nozzle almost simultaneously with the insertion of the gas filling nozzle into the packaging bag. .

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