JPH07125112A - Bag folding machine - Google Patents

Abstract

PURPOSE:To attain the work efficiency improvement and cost reduction of a bag folding means by automating bag folding work by installing a pair of rod members which are inserted from an opening end of a bag and separated from each other at about the center of the bag width. CONSTITUTION:A bag folding mechanism 22 is equipped with a pair of bag extending rods 52, 54 which approach to each other almost to be in contact with each other or separate from each other in the bag width direction. A pair of folding rods 56, 58 are installed which move to contact with each other or to separate from each other vertically to the transfer direction of the rods 52, 54. A support foot 62 which supports these rods to enable their movements and a half-turning apparatus 60 which supports the support foot 62 to be able to turn half reciprocatingly by 90 degree are installed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag folding device capable of automatically folding a pre-made bag along a desired line.

[0002]

2. Description of the Related Art Conventionally, a bag is refolded along a center line in the width direction thereof, and a sealing side end portion of the bag is formed into a bileaflet triangular shape (hereinafter, referred to as "triangular folding", see FIG. 6). Then, the triangular tip portion of each leaf is cut and then the cut end is welded. When the bag folded in this way is opened again along the fold line before the triangle fold, the trapezoidal part of the bilobes at the seal side end of the bag (when the tip of the triangular part is cut, it becomes trapezoidal). Can be remade into a container-shaped one that was originally bag-shaped.

Since such a bag reprocessing method is suitable for accommodating, for example, fish (mainly "eel") together with water by forming the bag into a container shape, it has been conventionally used. It has been widely practiced. Conventionally, the re-folding process of the bag including the triangular folding has been performed manually because there is no apparatus for it.

[0004]

However, performing such folding work of the bag by hand is extremely inefficient in work efficiency, resulting in a decrease in production efficiency and an increase in cost. Then, this invention aims at providing the apparatus which can automate the folding operation of a bag.

[0005]

In order to achieve the above object, a bag folding device according to the present invention has a first accommodating means for accommodating a plurality of bag-manufactured bags and a predetermined accommodating means for each bag. Folding means for folding along a line, first conveying means for conveying the bag from the first accommodating means to the folding means, second accommodating means for accommodating the bag after the folding is completed, and the folding means. Second transporting means for transporting the bag after the folding is completed from the means to the second accommodating means.

A preferred embodiment of the present invention is as follows. The folding means includes a pair of rod-shaped members that are inserted from the open end of the bag and that are separated from each other at approximately the center of the bag in the width direction. Further, the apparatus of the present invention may further have an opening means for opening the front and back surfaces of the bag from the opening end side, and this opening means is provided in the middle of the bag conveying path by the first conveying means. Prepare

The opening means is provided with a pair of suction devices that respectively suction the front and back surfaces of the bag near the opening, and a rotating mechanism that rotates the devices in opposite directions. Further, it has a separating means for taking out the individual bags from the first accommodating means,
The separating means includes an adsorbing device that adsorbs to each of the open side and seal side ends of the bag, and a blowing nozzle that blows static elimination air onto the bag from at least one end side of the open side and the seal side. .

[0008]

As described above, according to the present invention, the bag accommodated in the first accommodating means is conveyed to the folding means for folding the bag along the predetermined line by the first conveying means, and the folding is completed. The formed bag is conveyed to the second accommodating means by the second conveying means. Therefore, it is possible to automate the process from the start of folding the bag to the end thereof.

[0009]

Embodiments of the present invention will now be described with reference to the accompanying drawings. 1 and 2 are schematic plan views of the bag folding device 10 of this embodiment. This bag folding device 10
A bag accommodating mechanism 14 for accommodating a plurality of resin-made bags 12 stacked in advance and accommodating them, and a first bag conveying mechanism 20 for conveying the accommodated bags one by one to a bag folding machine 22 described later.
A bag opening machine 16 (see FIG. 2) for opening the bag 12 from the opening end 18, and a bag folding mechanism 22 for refolding the bag whose front and back surfaces are opened from the opening end 18 along a predetermined line. And a bag stacking mechanism 26 for stacking the folded bags,
A second transport mechanism 64 for transporting the folded bag from the bag folding mechanism 22 to the bag stacking mechanism 26.

The bag accommodating mechanism 14, as shown in FIG.
A bag accommodating base 28 in which a plurality of bags 12 are stacked and arranged so that the end on the sealing side (the end opposite to the opening end 18) is on the side opposite to the bag folding mechanism 22, and the bag accommodating base 28 is moved up and down. It comprises a support column 30 that is freely supported and a height adjustment mechanism 32 that adjusts the height of the accommodation table 28. The adjusting mechanism 32 penetrates the central portion of the bottom plate 28A and is housed in the casing 29, a driven gear device 33B meshed with one end of the gear device and rotationally driven by a motor 33A, and The screw jack 31 is screwed with the driven gear while penetrating through the center portion of the driven gear, and is moved up and down by the rotation of the gear.

The center of the screw jack 31 is fixed so as to come to the center of gravity of the bottom surface of the storage table 28, and the storage table 28 can be moved up and down by following the elevation of the jack. The height position of the storage table 28 can be adjusted to a height suitable for sending out the bag.

In FIG. 1, reference numeral 28B is a frame for fixing a suction pad 34, which will be described later, and the storage table 28 is vertically movable in a rectangular space near the center of the frame. Reference numeral 34 is a pad that can be adsorbed on the surface of the bag, and the inside of the pad is adjusted to be depressurized by a suction device (not shown). The height adjusting mechanism 32 is used for the bag 12
The height of the bag accommodating base 28 is appropriately adjusted so that the surface of the bag comes into contact with the vacuum pad 34.

The (first) suction pad 34 and the second
The suction pad 36 of the above constitutes a mechanism for separating the bags from the storage table 28 one by one, and the first suction pad 34
Is attached to the end of the bag on the seal side, and the second adsorption pad 36 is installed at a position to adsorb to the opening side of the bag so as to separate (separate) this bag from other bags. Similarly to the first suction pad 34, the second suction pad 36 is also sucked in the inside of the pad toward the vacuum side.

As shown in FIG. 2, as a bag separating mechanism, a static elimination air blowing machine 38 (schematic) for blowing air (static elimination air) for removing static electricity charged in the bag from the end portion on the seal side of the bag. Is displayed), and a pressing machine 40 for pressing the seal side end portion of the bag immediately below the bag to be separated from above is provided. The uppermost bag among the bags accommodated by the static elimination air sprayer 38 and the presser 40 is separated from the bags below it.

As shown in FIGS. 1 and 2, the first suction pad 34 is fixed at the seal side end of the bag of the support arm 44, and the other end of the support arm is vertical at both side ends of the frame 28B. It is fixed to the center of a shaft 43 interposed between a pair of support columns 42 fixed to. The shaft 43 is configured to be reciprocally rotatable with respect to the column 42 by a driving means (not shown).

As described above, the second suction pad 36 adsorbs to the opening side of the bag at the uppermost end of the storage table 28, and as described above, this suction mechanism has the first suction pad. Is the same as. The second suction pad is the support arm 46.
The support arm 46 is fixed so as to face the bag at substantially the end on the bag side, and the support arm 46 is arranged toward the opening side in the longitudinal direction of the bag and is configured to be movable back and forth in the same direction. The support arm 46 is also configured to be movable up and down in a direction (vertical direction) at right angles to the above direction.

The static elimination air blower 38 is provided at a height suitable for blowing the static elimination air substantially horizontally to the seal end side of the bag. In addition, the presser 40 includes a piston 40A that reciprocates in the air cylinder in the longitudinal direction.
A flat plate 40B for pressing the bag from above is provided at the tip of this piston. The air blower itself is installed above the end of the stacked bags 12 on the seal side, and the air blower itself is also configured to be able to move up and down in a direction orthogonal to the storage table.

As shown in FIGS. 1 and 2, the bag folding device 22 of the present embodiment opens the front and back sides from the opening side 18 of the bag (the front and back sides of the bag are adhered to each other by the action of static electricity). The second suction pad 36 and a third suction pad 48 which is arranged at a distance from the suction pad and faces the back side of the bag from the second suction pad 36. And is configured.

The third suction pad 48 faces the support arm 46 from the back surface of the bag at a position slightly separated from the front end of the bag on the opening side. This third suction pad 4
8 also has the same structure as the second suction mechanism. As shown in FIG. 5, the second and third suction pads are configured to be rotatable in opposite directions about a longitudinal axis by a rotation mechanism (not shown).

The third suction pad 48 is near the opening-side end of the transported bag 12 (the bag 12 is transported to the third suction pad 48 while being sucked by the first suction pad 36). It is fixed by a fixed arm 50 arranged in the longitudinal direction of the bag at a position where it is adsorbed from the back surface of the bag. The bag folding device according to the present embodiment is provided with the first transport mechanism 20.
The first transport mechanism includes the second suction pad 36 and the support arm 46 that holds the suction pad 36 so as to move back and forth. Second suction pad 3
6 moves to a position facing the third suction pad 48 while adsorbing to the bag.

As shown in FIGS. 1 and 2 and FIG. 6 which is a detailed view thereof, the bag folding mechanism 22 is a pair of bag pulling rods that are so close to each other that they are in contact with each other or that are separated from each other in the width direction of the bag. 52 and 54, and a pair of folding rods 56 and 58 that come into contact with or separate from each other in a direction perpendicular to the moving direction of the bag extending rods 52 and 54.
And a supporting leg 62 that supports these rods so that they can contact or separate from each other, and a half-rotating device 60 that supports the supporting leg 62 so that it can reciprocate 90 degrees in half.

The support leg 62 is the rod 5 for extending the bag.
2, 54 and the folding rods 56, 58 are opened and closed like a pantograph, that is, as shown in FIG.
When the bag extending rods 52 and 54 are separated from each other, the folding rods 56 and 58 are in contact with each other,
When the bag pulling rods 52 and 54 are in contact with each other, the folding rods 56 and 58 are adjusted so as to be separated from each other.

These rods are contained in a bag 12 whose open end 1
By inserting from 8 and then expanding, the bag is refolded on the folding rods 56 and 58 along the expanding direction. The distance between the rods of each of these groups is slightly larger than the width of the bag when the rods are completely separated (in this state, the rods of any one of the above groups are inserted into the bag). After that, the bag can be supported while being tensioned when expanded. Also,
When the rods 52 and 54 are separated from each other, the folding rod 5
6, 58 are installed so as to come into contact with each other at the position of the center line 100 between the bag extending rods 52, 54. In addition, the folding rods 56 and 58 are the stretching rods 5.
It is formed shorter than 2,54. Therefore, the rods 56 and 58 are separated in the bag and at the same time the rods 52 and 54 are
When the two are close to each other, the above-mentioned "triangular folding" is achieved in which the seal side of the bag has a two-leaf triangular shape (Figs. 6 (3) and 6 (4)).
reference).

Reference numeral 64 shown in FIGS. 1 and 2 indicates a second transfer mechanism for moving the bag folding mechanism in the X and Y directions to transfer the folded bag to a bag stacking mechanism 26 described later. The back plate 63 supports the bag folding mechanism 22 so that the bag folding mechanism 22 can move back and forth in the width direction (X direction) of the bag, for example, by a rack and pinion mechanism, and the back and top of the back plate are folded by the back plate. The mechanism 22 includes a pair of upper and lower support rails 65 that support the mechanism 22 so as to be movable back and forth in a direction (Y direction) orthogonal to the X stroke. These moving mechanisms correspond to the rods 52, 54, 5
6, 58 (see (1) in FIG. 6) supports the bag folding mechanism 22 so that the height is approximately equal to the height of the surface where the second and third suction pads 36, 48 are mated. .

As shown in FIGS. 1, 3, and 7, the bag stacking mechanism 26 includes a stacking stand 66 on which the bags 24 that are folded in a triangular shape are stacked in order, and a support column 68 that supports the stacking stand 66 so that the stacking stand 66 can move up and down. And an adjusting mechanism 70 for adjusting the height of the stacking base 66, and the bag 24 for folding the triangularly folded bag 24.
Additional transport mechanism 72 for transporting from 2 to the stacking table 66
And a pressing mechanism 74 for pressing the seal side end of the bag 24 conveyed to the stacking table 66 from above, and an ironing mechanism 76 for fixing the fold line to the bag 24. The additional transport mechanism 72 constitutes a part of the second transport mechanism 64, and the adjuster 70 has substantially the same configuration as the bag storage table adjustment mechanism 32 (see FIG. 2). (In FIG. 3, the adjuster 70 is only shown schematically.). Due to the presence of this adjusting mechanism, the stacking base 66 can be adjusted to a height at which the upper end of the bag stacked on the base 66 abuts on the ironing mechanism 76.

The squeezing mechanism 76 is disposed above the stacking base 66 and squeezes the upper surface of the bag 24 over substantially the entire surface to squeeze the fold line formed by the folding mechanism 22 into the bag. 78 (see FIGS. 3 and 7), a width direction movement support mechanism 80 (see FIG. 1) that supports the ironing plate 78 so as to be movable back and forth in the width direction of the bag 24, and the movement mechanism 80 in the longitudinal direction of the bag 24. And a longitudinal movement mechanism 82 (see FIG. 1) that supports it so that it can move back and forth. These moving mechanisms 80 and 82 are ironing boards 78.
Is configured to be movable back and forth with respect to the bag stacking base 66. Further, as shown in FIG. 7, the additional transporter 72 includes a pair of sandwiching mechanisms 84 that sandwiches the ends of the triangularly folded bag 24.
The support mechanism 86 that supports the sandwiching mechanism 84 and the guide mechanism 88 that supports the support mechanism so as to move back and forth toward the bag side, and the additional transport mechanism 72 is also installed above the stacking table.

Further, the pressing device 74 is constructed so as to face the bag near the end portion of the bag 24, more specifically, above the apex of a triangularly folded triangle.
It has the same structure as the upper bag pressing device 40.

The longitudinal movement mechanism 82 is formed in a pair of plate-shaped members on both sides in the width direction of the bag 24, which are opposed to each other. The rack and pinion mechanism supports it so that it can move back and forth. The guide mechanism 88 is also provided in the lower portion of the mechanism 82 (on the side of the plane perpendicular to the plane of FIG. 1) having the same structure as the longitudinal movement mechanism 82, and a supporting mechanism 86 (width direction movement mechanism) by a similar well-known mechanism. (Structure similar to 80) is supported so that it can move back and forth.

The bag folding apparatus according to the present embodiment has a sequence controller in which the movement timing, movement amount, movement order, etc. of each element are predetermined, or various controllers such as a microcomputer for feedback controlling each element. The processes from the accommodation of the bag to the completion of stacking the bags after being folded are interrelated with each other and are controlled by the controller.

Next, the operation of this embodiment will be described based on the execution procedure (FIG. 8) of the storage program previously stored in the control device. When the main switch is turned “on”, the routine of FIG. 8 starts, and in step (hereinafter, simply referred to as “S”) 10, as shown in FIGS.
The height of the storage table 28 is adjusted by the height adjusting mechanism 32 until the upper ends of the plurality of bags 12 stacked on each other 8 come into contact with the first suction pad 34 and the second suction pad 36. The height adjustment amount is determined based on the number or weight of the stored bags and a storage program preset in the storage device of the controller.

Next, in S12, the first suction pad 3
By depressurizing the fourth and second suction pads 36, the upper surface of the bag 12 is sucked by both suction pads.
In the initial state of starting the program, the first suction pad 34 is in parallel with the upper surface of the bag as shown by the chain line in FIG.

Next, in S14, the support arm 44 pivots about the shaft 43 in the clockwise direction, so that the first suction pad 34, as shown in FIG. Is rotated above the storage table 28, and then the vicinity of the end portion 33A of the bag 12A immediately below the bag 12 to which the first suction pad 34 has been sucked is pressed by the pressing device 40, and at the same time, from the static elimination air blower 38. Static elimination air is blown from the end of the bag 12 on the seal side. By blowing this static elimination air onto the bag, it is possible to prevent static electricity from being regenerated when the bags are folded in a triangular shape and then the stacked bags are taken out, or when the openings of the bags are opened again. After the presser 40 is lowered toward the bag, the presser piston 40A presses the flat plate 40B toward the bag to press the bag.

This air is supplied between the uppermost bag 12 and the bag 12A immediately below it from the sealing side of the bag, and this air is blown from between these bags toward the opening of the bag, Static electricity between the bags 12 and 12A can be removed. These steps separate the topmost bag from the bag immediately below. After the end of S14, the first suction pad 34 and the presser 40 are connected to the next bag 12A.
Is returned to its original position so that the separation of

Next, in S16, the vacuum state in the first suction pad 34 is released, and the end of the bag 12 on the seal side is separated from the suction pad 34. At this time, the second
The adsorption pad 36 of No. 3 is adsorbed on the bag as it is. Next, the support arm 4 forming a part of the first transport mechanism 20.
The second suction pad 36 is moved in a direction away from the opening end 18 of the bag to a position facing the third suction pad 48 (the bag 12 is also moved at the same time). At this time, the bag 12A immediately below the bag 12 conveyed by the presser 40 may be pressed down, so that the bag 12 and the bag 12 may be pressed together.
It is possible to prevent A from moving. The above operation completes the first conveyance of the bag.

Next, in S18, when the second suction pad 36 and the third suction pad 38 face each other, the second suction pad 36 is moved toward the third suction pad 48 side at the same time. 3 suction pad 48 to the second suction pad 3
6 and the bag 12 is sandwiched between the pads (see FIG. 5 (1)).

After that, the second suction pad 36 and the third suction pad 48 are rotated in opposite directions or in the same direction while the third suction pad 48 is decompressed and the lower surface of the bag is suctioned (see FIG. 5 (2)). By doing this,
Both the front surface 120 and the back surface 122 in the bag are separated from each other (the two surfaces in the bag are initially adhered to each other by the action of static electricity).

Next, when the second suction pad 36 and the third suction pad 48 are moved in the directions away from each other,
While the front and back surfaces 120 and 122 of the bag 12 are sucked,
The bag is opened from the open end 18 toward the inside of the bag (Fig. 5).
(3)). These steps complete the opening of the bag.

Next, in S20, the bag folding mechanism 22 is moved to the opened bag. This movement is performed on the back plate 6
3 is advanced along the support rail 65 toward the bag 12 side. Bag extending rods 52 and 54 and bag folding rods 56 and 5 that constitute the bag folding mechanism 22.
8 is initially on the same plane (see FIG. 6 (1)), and the folding mechanism 22 is further moved to the bag side until these rods are inserted into the opened bag.

At this time, the bag extending rod 52,
The distance between 54 is slightly shorter than the width of the bag 12 so that the rods 52, 54 can be easily inserted into the bag. After the rods 52, 54 are inserted into the bag, The rods are further separated by a distance slightly longer than the distance between the both side edges of the bag, and the rods 52,
While abutting 56 to apply tension in the width direction to the bag 12,
This is supported (see FIG. 8 (2)). After this, the second
The decompression of the suction pad 36 and the third suction pad 48 is released and the atmosphere is opened to end the suction between the bag and these pads.

Next, the folding mechanism 22 is retracted in the direction in which the back plate 63 is separated from the storage base 28 along the support rails to return to the initial position, and further, the link mechanism (support leg) which performs the pantograph-like movement described above. 62) by the rod 5
2 and 54 are moved in the direction of approaching each other, and the bag folding rods 56, 58 are expanded in the direction of moving away from each other (FIG. 8 (3)). As a result, the bag 12 becomes the rods 56, 5
8 will be refolded at a new folding line.
The rods 56 and 58 are in the central position between the rods 52 and 54, and when the rods 56 and 58 expand,
Since both side edges 12Z of the bag accurately abut the rods 52 and 54, the bag can be accurately refolded along the center line 100 in the width direction of the bag 12. Next, the reversing device 60 rotates the plurality of rods by 90 ° to rotate the bag after folding so as to be horizontal with the storage table 28.
(See FIG. 8 (4)). The above process completes the folding of the bag.

Next, in S22, the bag folding mechanism 22 moves along the back plate 63 in the width direction of the bag to the side where the bag stacking base 66 is present and stops. Next, the support mechanism 86 moves in the direction of the bag folding mechanism 22 along the guide mechanism 88, and the sandwiching mechanism 84 protruding from the support mechanism 86 reaches the folded bag. As shown in FIG. 7, this pinching mechanism 86
The pair of clips abut each other and sandwich the triangular base portion 124 of the bag 24 folded in a triangular shape between these clips.

Immediately after this, the folding rods 56 and 58 of the bag folding device 22 move so as to be slightly closer to each other to release the tension applied to the bag. Then, when the support mechanism 86 retracts in the opposite direction and the sandwiching mechanism 84 is positioned such that the triangular top portion 126 of the bag comes to the rear end position of the bag stacking base, the retracting operation is completed (FIG. 1).

Next, when the pair of clips of the sandwiching mechanism 84 are separated from each other and the supporting mechanism 86 is slightly retracted in the same direction, the bag is separated from the space between the clips and the bag after folding is placed on the stacking stand 66. Placed. Then, the pressing mechanism 74 descends to press the triangular top 126 of the bag,
The pair of ironing plates 78 are moved downward from the upper position of the bag while being adjacent to each other. Next, each ironing plate 78 is moved in the width direction of the bag by the width direction moving mechanism 80 while being moved in the length direction of the bag by the above-mentioned longitudinal direction moving mechanism 82. Therefore, the ironing plate 78 presses the bag while moving diagonally toward the side end of the opening-side tip of the bag. As a result, the fold line formed on the center line 100 of the bag can be fixed. By these processes, the second conveyance of the folded bag and the accommodation of the folded bag are completed.

Thereafter, the bag folding mechanism 22 and the supporting mechanism 8
Each of the mechanisms such as 6 and the ironing plate 78 returns to the initial state in order to prepare for the next conveyance, folding, storage, etc. of the bag,
Then, the process returns to S1.

In this way, the bags that have been completed of the triangular folding are collectively taken out from the accommodating table 66, and when the cutting mechanism (not shown) cuts out the vicinity of the triangular tip into a straight line, the cut-out portion is welded. When such a bag is expanded so that the folding lines before being folded by the bag folding mechanism 22 are separated from each other, it becomes a container shape having a bottom surface.

As described above, according to the present embodiment, it is possible to provide a folding device that can automatically and quickly perform triangular folding which has been conventionally performed manually. Also,
Since it is possible to prevent the generation of static electricity when supplying the bag, the bag can be quickly supplied, and when opening the opening of the bag, the front and back surfaces of the opening are offset from each other, so It becomes easy to open the bag from the opening, and the triangular folding of the bag proceeds smoothly. Still further, according to the present invention, static electricity can be prevented from being regenerated after the bag is triangularly folded by static elimination air, so that the work after the triangular folding such as opening the bag again is prevented by the static electricity. There is no. In the above embodiments, the triangular folding is described as an example, but the present invention is not limited to this, and the present invention can of course be applied to any folding method of folding a bag on a predetermined line.

[0046]

As described above, according to the present invention, it is possible to provide a bag folding device which can improve the work efficiency and hence the cost by automatically performing the work of folding the bag. .

[Brief description of drawings]

FIG. 1 is a plan view of an apparatus according to an embodiment of the present invention.

FIG. 2 is a side view thereof.

FIG. 3 is a partial side view thereof.

FIG. 4 is a detailed configuration diagram of the first suction pad.

FIG. 5 is a perspective view showing operating states of second and third suction pads.

FIG. 6 is a perspective view showing an operating state of the bag folding mechanism.

FIG. 7 is a perspective view showing an operating state of a bag clamping mechanism and an operating state of an ironing plate.

FIG. 8 is a flowchart of a processing routine of an operation program of a controller of the apparatus of this embodiment.

[Explanation of symbols]

 10 bag folding device 12 bags 14 bag accommodating mechanism 16 bag opening mechanism 20 bag conveying mechanism 22 bag folding mechanism 26 bag stacking mechanism

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiromi Emoto 556-10 Hayashinogo, Ueda-shi, Nagano Prefecture Shinano Engineering Co., Ltd.

Claims (5)

[Claims] 1. A first accommodating means for accommodating a plurality of manufactured bags, a folding means for folding an individual bag along a predetermined line, and a bag from the first accommodating means to the folding means. A first conveying means for conveying the bag, a second accommodating means for accommodating the bag after the folding is completed, and a second conveying means for conveying the bag after the folding from the folding means to the second accommodating means. And a bag folding device. 2. The folding device according to claim 1, wherein the folding means includes a pair of bar-shaped members that are inserted from an opening end of the bag and are separated from each other at substantially the center of the width direction of the bag. 3. The bag folding device according to claim 1, wherein opening means for opening the front and back surfaces of the bag from the opening end side is provided in the bag conveying path by the first conveying means. 4. The bag folding device according to claim 3, wherein the opening means includes a pair of suction devices that respectively suction the front and back surfaces near the opening of the bag, and a rotating mechanism that rotates the devices in opposite directions. . 5. A separating means for taking out the individual bags from the first accommodating means, the separating means adsorbing the adsorbing device for adsorbing to each of the open side and seal side ends of the bag, and the static elimination air as described above. A blowing nozzle that blows onto the bag from at least one of the open side and the seal side.
5. The bag folding device according to at least one of items 4 to 4.