JPH09124007A - Automatic opening device for packaging bag, and automatic bagging method for article therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make proper and certain automatic opening possible for the mouth of a packaging bag made of plastic sheets by a method wherein pairs of rollers constructed for producing sufficient friction force are arranged oppositely, facing the surfaces on both sides of the mouth of the packaging bag. SOLUTION: A plurality of frictional contact members (rubber rollers 22a, 22b, 24a and 24b) rotating in contact with one another for producing appropriate friction are provided oppositely, facing the surfaces on both sides of the mouth of a packaging bag 10 made of flexible plastic sheets, and the surfaces 10a and 10b on both sides of the mouth of the packaging bag are partially drawn respectively toward the outside with the frictional contact members brought into contact with the flexible plastic sheets and driven in rotative motion in the reciprocal direction, and the mouth of the packaging bag is opened with the opposite frictional contact members on both sides separated from each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of automatically packaging an article when a packaging bag made of a flexible plastic sheet is used, and in particular, a packaging bag of this kind is taken out one by one to store the article. The present invention relates to an automatic opening device for a packaging bag that can automatically open a bag mouth as appropriate and a method for automatically packing an article using the same.

[0002]

2. Description of the Related Art Conventionally, when a packaging bag made of a flexible plastic sheet is used for automatic packaging of various articles,
It is necessary and important to automatically open the bag mouth of the packaging bag. In this case, in the conventional automatic device of this type, for example, when opening the bag mouth, a vacuum pad is brought into contact with both side surfaces of the bag mouth, and the opposing pads are separated while sucking the packaging bag by negative pressure. It is known that the bag mouth is opened by opening the bag.

[0003]

However, in the above-described conventional automatic opening device for a packaging bag using the vacuum pad, an appropriate opening state is generated due to static electricity or wrinkles generated in the packaging bag (plastic sheet). There was a problem that it could not be opened, or it could not be opened at all.

Therefore, an object of the present invention is to provide a plurality of friction contact members configured to generate an appropriate frictional force while rotatingly contacting a plastic sheet forming a packaging bag, on both side surfaces of the bag mouth of the packaging bag. The object of the present invention is to provide an automatic opening device for a packaging bag that can always automatically and properly open the opening of the bag mouth by arranging it facing each other, and an automatic bagging method for articles using the same.

[0005]

Therefore, according to the present invention, a plurality of frictional members which generate an appropriate frictional action while rotatingly contacting both side surfaces of a bag mouth of a packaging bag made of a flexible plastic sheet. Contact members (a pair of rubber rollers composed of two rubber rollers adjacent to each other) are arranged to face each other, and the friction contact members are brought into contact with the flexible plastic sheet so as to rotate relative to each other, whereby one side surface of the bag mouth of the packaging bag is closed. It has been found that the above object can be achieved by providing means for pulling the parts outward and separating the opposing frictional contact members to open the bag mouth of the packaging bag.

However, in the automatic opening device for a packaging bag having the above-mentioned structure, the plurality of frictional contact members are each composed of two rubber rollers adjacent to each other, and these rubber roller pairs sandwich the bag mouth of the packaging bag from both side surfaces thereof and mutually hold them. It may be configured such that two rubber rollers adjacent to each other in a slightly pressed state are rotated outwardly with respect to the packaging bag at the adjacent contact portions.

Further, the packaging bag made of a flexible plastic sheet is made of a continuous cylindrical plastic sheet, and a heat seal is formed in advance with a predetermined gap in the longitudinal direction with respect to this sheet, and the heat seal is placed close to the heat seal. It is possible to preferably use a configuration in which a cutting perforation is formed in parallel with this and a position detection marker is provided for appropriately determining the cutting position at the cutting perforation.

Further, the automatic opening device is a packaging bag sheet reel for continuously feeding a packaging bag sheet made of a flexible plastic sheet, and a sheet feeding guide for guiding and feeding the packaging bag sheet in a predetermined direction. Marker detecting means for detecting a position detection marker of the delivered packaging bag sheet, sheet pressing means and sheet cutting means for holding the packaging bag sheet at a predetermined position and separating the packaging bag sheet for each packaging bag. And a packaging bag taking-out means for holding both ends of the bag mouth of the packaging bag supplied to the leading end of the sheet supply guide and positioning it between a plurality of friction contact members.

In this case, the packaging bag take-out means is rotatably supported by a common spline shaft and is moved toward and away from each other to loosen the bag mouth of the packaging bag to perform automatic opening and extend it to close the bag mouth. Can be configured to do so.

The rubber roller pairs forming the plurality of frictional contact members may be supported by a supporting member provided with a moving unit that moves toward and away from each other.

Further, in a positional relationship similar to that of the supporting members which respectively support the rubber roller pairs constituting the plurality of friction contact members, a seal pressing member and a heater means for heat sealing the bag mouth of the opened packaging bag are provided. Facing each other,
The seal pressing member and the heater means may be configured to come into contact with and separate from each other.

Further, in the present invention, the above-mentioned automatic opening device is used to automatically open the packaging bag, and in this state, after the required articles are put into or filled in the packaging bag, the packaging bag is further opened. By sealing the opening edge portion by heat sealing, the automatic bagging operation of the packaging bag can be smoothly and quickly achieved.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an automatic opening device for a packaging bag and an automatic bagging method for articles using the same according to the present invention will be described below in detail with reference to the accompanying drawings.

First, the principle of operation of the automatic opening device for a packaging bag according to the present invention will be described with reference to FIGS.

FIG. 1 is a plan view seen from the upper part of the bag mouth of the packaging bag 10, and the plastic sheet is sandwiched between the opposing outer surfaces of the flexible plastic sheets 10a and 10b forming the bag mouth. , Two adjacent rubber rollers 22a, 22b and 24a, 24b are arranged facing each other as shown in the figure. That is, two adjacent rubber rollers 22a, 22b (or 24)
a, 24b) adjacent to the other two adjacent rubber rollers 24a, 24b (or 22a, 22b)
One of the rubber rollers 24a (or 22b) is arranged to face each other.

Therefore, as shown in FIG. 2, the rubber roller pair 20 having the above-described structure sandwiches the bag mouth of the packaging bag 10 to be opened and slightly presses each other, and the rubber roller pair 20 is set in a predetermined manner. Rotate in the direction. In this case, each rubber roller 22a, 22b and 24a, 24
The rotation direction of b is set as shown in FIG. That is, the two adjacent rubber rollers 22a and 22b (or 24a and 24b) contact each other, and the sheet 10a (or 10) on one side of the packaging bag 10 is provided between the contact portions.
Each of b) is rotated in the direction of pulling outward.

Therefore, as described above, the rubber roller pair 2
By rotating 0, as shown in FIG. 3, a part of the opposing flexible plastic sheets 10a and 10b forming the bag mouth of the packaging bag 10 is formed by two adjacent rubber rollers 22a, 22b and 24a. It is sandwiched between 24b and pulled out slightly to the outside.

In this state, the rubber roller pair 20
As shown in FIG. 4, they move away from each other in the direction of opening the bag mouth of the packaging bag 10. As a result, the bag mouth of the packaging bag 10 is sufficiently opened, and in this state, desired articles can be put or filled in the bag.

Packaging Bag Used Next, an embodiment of the packaging bag 10 which can be preferably used in the automatic opening device according to the present invention will be described.

FIG. 5 is a continuous cylindrical plastic sheet manufactured by blow molding or the like. The heat seal 12 is formed in advance with a predetermined gap in the longitudinal direction with respect to this sheet, and is placed close to the heat seal 12. The perforation 14 for cutting is formed in parallel with this. Therefore, by cutting the plastic sheet at the perforations 14 for cutting, the packaging bag 10 having the cut portion as the bag mouth can be configured. In the present embodiment, position detection for properly determining the cutting position of the perforation 14 for cutting when sequentially supplying the continuous cylindrical plastic sheet to a predetermined position forming each packaging bag 10. A marker 16 for use is provided. In addition, by providing perforation perforations 18 that are continuous in parallel with the longitudinal direction of the continuous tubular plastic sheet, it is convenient for the end user to open the packaging bag 10 in which the article is finally enclosed. Can be offered.

FIG. 6 shows a packaging bag 10 obtained by cutting the perforations 14 for cutting.

Next, the packaging bag 10 having the above structure.
The automatic opening device and the automatic bagging method for articles according to the present invention in the case of using the will be described. That is, FIG.
~ Fig. 9 shows the automatic supply process of the packaging bag, and Figs.
Shows the automatic opening process of the packaging bag, and FIGS.
Shows the automatic sealing process of the packaging bag. Hereinafter, these steps will be sequentially described.

Automatic Supplying Process of Packaging Bag In FIGS. 7 to 9, reference numeral 30 indicates a packaging bag sheet reel in which the sheet 31 obtained by continuously molding the packaging bag described above is loaded on the winding reel. Thirty
A marker detection means 33 for detecting the position detection marker 16 (FIG. 5) provided for each packaging bag is provided in the drawer portion 32 of FIG. A sheet feeding guide 34 for guiding the leading end of the packaging bag sheet 31 in a predetermined direction is provided at a position separated from the installation position of the marker detecting means 33 by a predetermined distance.
Is provided, and the sheet pressing means 3 is provided at one end (upstream side) thereof.
5 and sheet cutting means 36 are provided. Further, at the other end (downstream side) of the sheet supply guide 34, approximately 90
A packaging bag chuck means 38 supported by a packaging bag taking-out arm 37 that swings and swings in an angle range of ° is provided so as to be appropriately positioned. The reference numeral 39 indicates a fulcrum fulcrum of the packaging bag taking-out arm 37.

In the automatic supplying process of the packaging bag thus constructed, the pulling portion 32 is pulled out from the packaging bag sheet reel 30.
The packaging bag sheet 31 that is sent through the above is intermittently carried out by the marker detecting means 33 for each bag. That is, in the state shown in FIG. 7, when one packaging bag sheet 31 is supplied from the packaging bag sheet reel 30 along the sheet supply guide 34, as shown in FIG. The packaging bag chuck means 38 grips the sheet, and at the same time, the sheet pressing means 35 operates to press and hold a part of the packaging bag sheet 31, and then the sheet cutting means 36 operates to hold the packaging bag sheet 31 at a predetermined position ( Perforation for cutting 14)
To separate. The packaging bag 10 thus separated
As shown in FIG. 9, it is prepared to be moved by the turning operation of the take-out arm 37 to move the bag mouth upward and to proceed to the next automatic opening step.

In the present embodiment, the marker detecting means 33 may be an optical detecting device using an optical fiber or the like. A fluid pressure cylinder can be used as the operating means of the sheet pressing means 35 and the sheet cutting means 36.

Automatic opening process of packaging bag FIGS. 10 to 14 show the packaging bag chuck means 3 of the packaging bag take-out arm 37 with the bag mouth of the packaging bag 10 shown in FIG. 9 facing upward.
8 shows a case where the state held by 8 is viewed from above.

That is, in FIG. 10, the packaging bag 10
Has a pair of packaging bag take-out arms 3 whose both ends are supported on a spline shaft 39a forming a swivel fulcrum 39.
7a, 37b packing bag chuck means 38, 38, respectively
Is held by However, the rubber rollers 22a and 22b are provided on both side surfaces of the packaging bag 10 on the bag mouth side, respectively.
And a pair of rubber rollers 20 and 20 composed of 24a and 24b
Are arranged facing each other. In this case, the rubber roller pair 20, 2
0 is supported by support members 40 and 41, respectively, and these support members 40 and 41 are configured to move toward and away from each other by moving means 42 and 43. Also,
The rubber roller pair 20, 20 is provided with a rubber roller 22a, 22b on one side through gears 44a, 44b.
Is set to rotate in a predetermined arrow direction. Similarly, each of the rubber rollers 24a and 24b on one side is also set to rotate in a predetermined arrow direction via gears 45a and 45b, respectively.

In this embodiment, the one moving means 4 is used.
2, the fluid pressure cylinder 46 and the spring 47 may be combined, and the other moving means 43 may be configured by combining the fluid pressure cylinder 48 and the displacement rod 49.

Therefore, in this embodiment, first, the moving means 42 and 43 are driven. As a result, FIG.
As shown in FIG. 5, the rubber roller pairs 20, 20 are brought into close contact with each other on both sides of the packaging bag 10 on the bag mouth side.
Pinch. Next, as shown in FIG. 12, the packaging bag take-out arms 37a and 37b holding both ends of the packaging bag 10 are moved parallel to each other on the spline shaft 39a, as shown in FIG. As a result, the packaging bag 10 is in a loosened state on the bag mouth side.

In the above state, the rubber roller pair 2
When 0 and 20 are respectively driven to rotate in predetermined directions, the automatic opening operation of the bag mouth of the packaging bag 10 can be performed according to the principle based on FIGS. 1 to 4 described above (see FIG. 13). With this automatic opening operation, the moving means 42, 43
By driving the rubber rollers 20 and 20 away from each other, the bag mouth of the packaging bag 10 can be automatically opened to an appropriate state as shown in FIG.

In this way, according to the automatic opening device for the packaging bag 10 of this embodiment, the required articles are immediately inserted or filled into the packaging bag 10 in the state where the packaging bag 10 is automatically opened. be able to.

By immediately sealing the bag mouth of the packaging bag 10 into which the articles have been added or filled, the automatic packaging of the articles, that is, the automatic bagging operation can be achieved.

Automatic Sealing Process of Packaging Bag FIGS. 15 to 17 show the case where the required articles are put into or filled into the inside of the packaging bag 10 that has been automatically opened by the automatic opening device of the packaging bag 10 described above (see FIGS. 15), which is a process of automatically sealing the bag mouth.

That is, in this case, as shown in FIG. 16, in the same positional relationship as the rubber roller pairs 20, 20, the seal pressing member 50 for heat sealing and the heater means 52 are arranged to face each other. . And
The seal pressing member 50 and the heater means 52 are provided with moving means such as a fluid pressure cylinder, respectively, and are configured to approach and separate from each other.

Therefore, in the packaging bag 10 in which the articles M have been added or filled, the packaging bag take-out arms 37a and 37b holding both ends thereof are respectively attached to the spline shaft 39.
On the a, the packaging bag 10 is moved in parallel in a direction in which the packaging bag 10 is appropriately separated from each other, and the bag mouth is extended to an appropriate closed state, and then the seal pressing member 50 and the heater means 52 are brought into contact with each other and separated from each other. Heat seal 19
Can be achieved. Then, the packaging bag 10 that has completed the heat seal 19 can be recovered as it is by opening the chuck means 38, 38.
The packaging bag 10 thus obtained can complete the automatic bagging operation for the article M as shown in FIG.

The preferred embodiment of the present invention has been described above. However, the present invention is not limited to the above-mentioned embodiment, and for performing automatic opening of the bag mouth of a packaging bag made of, for example, a flexible plastic sheet. Two adjacent rubber rollers have been illustrated as the members, but other than that, members having a function of mutually rotating and in contact with each other and having an appropriate frictional action with the flexible plastic sheet to pull it out If so, not only can frictional contact members having various materials, shapes, and structures be adopted, but also with other configurations, various design changes can be made without departing from the spirit of the present invention. Of course.

[0037]

As is apparent from the above-described embodiments, according to the automatic opening device for a packaging bag according to the present invention, the packaging bag 10 made of a flexible plastic sheet is provided on each side of the bag mouth. A plurality of frictional contact members (adjacent two rubber rollers 22) that generate an appropriate frictional action while rotatingly contacting each other.
A pair of rubber rollers 20, 20b consisting of a, 22b and 24a, 24b are arranged so as to face each other, and the frictional contact members are brought into contact with the flexible plastic sheet and driven to rotate mutually, so that both side surfaces of the bag mouth of the packaging bag. (10a, 10b)
By providing a means for opening the bag mouth of the packaging bag by pulling a part of each of them outward and separating the friction contact members facing each other, the opening of the bag mouth of the packaging bag is always maintained. Proper and reliable automatic opening is possible.

Further, in the present invention, the automatic opening device having the above construction is used to automatically open the packaging bag, and in this state, after the required articles are put into or filled in the packaging bag, the packaging bag is further packaged. By sealing the opening edge of the bag by heat sealing, the automatic bagging operation of the packaging bag can be accomplished smoothly and quickly.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing an operating principle of an automatic opening device for a packaging bag according to the present invention.

FIG. 2 is a schematic explanatory diagram showing a state at the time of starting the operation of the packaging bag and the rubber roller pair shown in FIG.

FIG. 3 is a schematic explanatory view showing a state in which an opening operation progresses by the packaging bag and the rubber roller pair shown in FIG.

FIG. 4 is a schematic explanatory view showing a substantially completed state of the opening operation by the pair of packaging bags and the rubber roller shown in FIG.

FIG. 5 is a schematic explanatory view showing an embodiment of a continuously formed packaging bag sheet used in the automatic opening device according to the present invention.

6 is a schematic explanatory view showing a configuration of a packaging bag separated from the packaging bag sheet shown in FIG.

FIG. 7 is an explanatory view showing an embodiment of an automatic packaging bag supplying step in the automatic packaging bag opening device according to the present invention.

FIG. 8 is an explanatory diagram showing an operating state in the automatic supply process of the packaging bag shown in FIG. 7.

9 is an explanatory diagram showing the next operation state in the automatic supply process of the packaging bag shown in FIG.

FIG. 10 is an explanatory view showing an example of an automatic opening process of a packaging bag in the automatic packaging bag opening device according to the present invention.

FIG. 11 is an explanatory diagram showing an operating state in the automatic opening step of the packaging bag shown in FIG.

12 is an explanatory diagram showing a next operation state in an automatic opening step of the packaging bag shown in FIG.

FIG. 13 is an explanatory diagram showing the next operation state in the automatic opening step of the packaging bag shown in FIG.

FIG. 14 is an explanatory diagram showing the next operation state in the automatic opening step of the packaging bag shown in FIG.

FIG. 15 is an explanatory view showing an example of an automatic sealing process of a packaging bag in the method for automatically packaging a packaging bag according to the present invention.

16 is an explanatory diagram showing an operating state in the automatic sealing process of the packaging bag shown in FIG.

17 is an explanatory view showing a packaging bag in which articles are stored and sealed by the packaging bag automatic sealing process shown in FIG. 16. FIG.

[Explanation of symbols]

 10 Packaging Bags 10a, 10b Plastic Sheet 12 Heat Seal 14 Cutting Perforation 16 Position Detection Marker 18 Opening Perforation 19 Heat Seal 20 Rubber Roller Pair 22a, 22b Rubber Roller 24a, 24b Rubber Roller 30 Packaging Bag Sheet Reel 31 Packaging Bag Sheet 32 Drawer 33 Marker detecting means 34 Sheet feeding guide 35 Sheet pressing means 36 Sheet cutting means 37 (37a, 37b) Packaging bag take-out arm 38 Packaging bag chucking means 39 Swiveling fulcrum 39a Spline shafts 40, 41 Supporting members 42, 43 Moving means 44a, 44b Gears 45a, 45b Gears 46 Fluid pressure cylinders 47 Springs 48 Fluid pressure cylinders 49 Displacement levers 50 Seal holding members 52 Heater means M Articles

Claims (8)

[Claims] 1. A plurality of frictional contact members that generate an appropriate frictional action while rotatingly contacting each other on both sides of a bag mouth of a packaging bag made of a flexible plastic sheet, and these frictional contact members are arranged. By abutting against the flexible plastic sheet and mutually rotatingly driving, a part of both side surfaces of the bag mouth of the packaging bag is pulled out respectively, and the friction contact members facing each other are separated from each other, and thus the packaging bag. A device for automatically opening a packaging bag, which is provided with means for opening the bag mouth. 2. The plurality of frictional contact members each comprise two rubber rollers adjacent to each other, and the pair of rubber rollers sandwiches the bag mouth of the packaging bag from both side surfaces thereof and slightly presses each other so that the two rubber rollers are adjacent to each other. 2. The automatic opening device for a packaging bag according to claim 1, wherein the rubber roller is configured to rotate outwardly with respect to the packaging bag at its adjacent contact portion. 3. A packaging bag made of a flexible plastic sheet is made of a continuous tubular plastic sheet, and a heat seal is formed on the sheet in advance with a predetermined gap in the longitudinal direction, and the heat seal is placed close to the heat seal. The automatic opening device for a packaging bag according to claim 1, wherein a perforation for cutting is formed in parallel therewith, and a position detection marker for appropriately determining a cutting position at the perforation for cutting is provided. 4. A packaging bag sheet reel for continuously delivering a packaging bag sheet made of a flexible plastic sheet, a sheet supply guide for guiding and feeding the packaging bag sheet in a predetermined direction, and a package to be delivered. Marker detecting means for detecting the position detection marker of the bag sheet, sheet holding means and sheet cutting means for holding the packaging bag sheet at a predetermined position and separating the packaging bag sheet, the sheet supply The packaging bag take-out means for holding both ends of the bag mouth of the packaging bag supplied to the tip end portion of the guide and positioning it between a plurality of friction contact members. Automatic opening device for packaging bags. 5. The packaging bag taking-out means is rotatably supported by a common spline shaft, and is moved toward and away from each other to loosen the bag mouth of the packaging bag to perform automatic opening and extend the bag to close the bag mouth. The automatic opening device for a packaging bag according to claim 4, which is configured as described above. 6. The automatic opening device for a packaging bag according to claim 2, wherein each of the rubber roller pairs forming the plurality of frictional contact members is supported by a supporting member having a moving unit that moves toward and away from each other. 7. A seal holding member and a heater means for heat-sealing the bag mouth of the opened packaging bag in the same positional relationship as the supporting members respectively supporting the rubber roller pairs constituting the plurality of friction contact members. 7. The automatic opening device for a packaging bag according to claim 6, wherein the seal pressing member and the heater means are arranged so as to face each other and come into contact with and separate from each other. 8. The automatic opening device according to claim 1, wherein the packaging bag is automatically opened, and in this state, after the required articles are loaded or filled into the packaging bag, Furthermore, an automatic bagging method for a packaging bag is characterized in that the opening edge of the packaging bag is closed by heat sealing.