JPS621054Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention automatically and seamlessly performs a series of operations for sealing the bag opening with a flap part extending from the bag opening in a bag containing a target material. The present invention relates to a device in which the parts are properly shaped so that they can be performed all at once without fear of wrinkles, distortions, etc.

A packaging bag for storing various materials, which has a series of extended sealing flaps at the mouth of the bag and is equipped with an adhesive structure such as double-sided adhesive tape or pressure-sensitive adhesive on the flap. There is. The seal at the opening of such a bag is as follows:
The cover or guard member of the adhesive structure applied to the flap part is peeled off, and then the flap part is folded over the bag opening and overlapped, and is fixed to the bag body side by the adhesive structure to seal the bag opening. Sealing is performed, and in order to improve productivity and save labor, it is common to employ automated mechanized means for this series of sealing operations. Unlike manual work, when this is done mechanically, the folding, overlapping, and adhesive fixing of the flap often causes problems such as wrinkles, distortion, and misalignment of the flap, resulting in a uniform and beautiful finish. These bags have the disadvantage of not being able to obtain a good sealing finish, and since these bags are originally made of thin, stiff and soft materials, the above-mentioned trouble is considered unavoidable and is a weak point in mechanized work.

The present invention solves these problems, automates the folding and polymerization bonding of the flap, and also makes it possible to reliably prevent wrinkles, distortions, etc. from occurring in the flap. There is a first conveyor that conveys the bags in one direction with the flap section at the rear, and a first conveyor that is disposed in a continuous manner with and below the conveyor and that transports the bags received from the conveyor at least in the conveying direction of the first conveyor. a second conveyor capable of conveying in the opposite direction; and a second conveyor disposed between the conveying end of the first conveyor and the conveying surface of the second conveyor to support the flap portion of the bag received on the second conveyor. A shaping guide plate is also provided with an air injection means for expanding the flap in the width direction, and a flap folding arm is disposed so as to be movable toward and away from the plate and folds and overlaps the flap over the bag opening. It is at the point of becoming.

The present invention will be described in detail below with reference to the embodiments shown in the drawings. What is shown in FIGS. 1 and 2, a flap part 2 is formed in a continuous manner at the bag opening 1 of the bag body 6, and a double-sided adhesive tape 3 is laid on the flap part 2 in its width direction.
A polymeric coating material 4 is attached to the outer surface of the mold release material 4 as a safeguard. Of course, as an adhesive structure,
As shown in Figure 3A, pressure-sensitive adhesive 5 is laid down and the outer surface is covered with mold release material 4 as a safeguard, or as shown in Figure 3B, pressure-sensitive adhesive 5 is simply laid down. Various adhesive structures are used. After charging and storing the required materials A to be packaged into the bag body 6 from the bag mouth 1, when folding and overlapping the flap portion 2 onto the bag mouth 1 and attaching and fixing it, release material 4, etc. In cases where safeguards are used together, this is first peeled off, and then the flap part is bent and superimposed on the bag opening 1, and the tape 3 or adhesive 5 is used to fix it on the bag opening 1. , the bag opening 1 will be sealed, but if this is done manually, the flap part 2 will be affixed uniformly on the bag opening 1 without wrinkles or distortion by the operator's careful attention and correction. Even if it can be done, it takes a lot of time and effort and takes up a considerable amount of production time. In order to eliminate such inefficiency, this has recently been done by some kind of mechanical means, but it is difficult to handle the work by hand, and the material of the bag 6 is thin and soft. Coupled with the use of the flap, the flap is often applied with wrinkles, or is applied in a distorted or bent state.

In order to eliminate such problems, the present invention proposes a new automatic sealing device as illustrated in Figures 4 to 9 below. This is suitable for folding and pasting the flap part 2 after peeling off the release material 4 for the bag 6 of the type that uses the safeguard release material 4 shown in FIGS. 2 and 3A. This shows the device type, and the present invention can be applied to devices other than this type.

In FIG. 4 showing the entire device and FIGS. 5 to 9 showing the structure of each main part, the bag body 6 in which material A has already been stored is placed with the bottom of the bag at the front and the flap part 2 at the rear. A first conveyor 7 is provided so as to be able to circulate freely, and conveys the mold release material 4 (hereinafter referred to as mold release tape because it is tape-shaped) in the direction of arrow a with the mold release material 4 facing upward. 7
A peeling base 8 for peeling off the mold release tape 4 is placed above the conveyance path at a distance suitable for the passage of the bag 6. As shown in FIG. 5, the base 8 has a peeling roller 9 on one side facing the bag body 6.
is mounted on a shaft so that it can rotate freely, and a hook plate 12 is provided behind the roller 9 with a suction port 14 on which the release tape 4 is hooked.
A suction tube 15 is connected to the suction tube 15 to constitute a suction means 13 for removing the peeled release tape 4. In addition, in correspondence with the peeling roller 9 and the hook plate 12, on the side of the first conveyor 1, the flap portion 2 of the bag body 6 is nipped in circumferential contact with the peeling roller 9 when it is lifted, and is bent into a mountain shape. A nip bar 10 that guides the conveyor 7 is disposed so as to be able to move up and down inside and outside the conveyor 7 via the first cylinder 11. In principle, the peeling device for the release tape 4 using the peeling base 8 or lower may be provided at only one location in the center, but in order to ensure the reliability of peeling, it is necessary to It is also possible to provide three locations, one in the center, one on the left and one on the left, so that both sides can be peeled off at the same time. Above the conveyor behind the peeling base 8, a presser belt 16 is provided with a support shaft 17 as a fulcrum in order to lightly press the passing bags 6 to ensure stable and reliable transfer.
The second cylinder 18 is arranged so as to be swingable as shown in the fifth figure, and the first cylinder 11 and the second cylinder 1 are arranged at appropriate locations by sensing the bag body 6.
8. Floodlight 1 as a sensing member that gives a lifting command to 8.
9a and a light receiver 19b are arranged, and the flap part 2
When the bag reaches the nip bar 10, the bottom side of the preceding bag 6 is sensed.

A second conveyor 20 is disposed in a continuous manner with the conveyance end of the first conveyor 7 and below the conveyor 7, as shown in the figure, as a conveyor for receiving the bags 6 conveyed by the first conveyor 7. As shown in FIGS. 6 and 7, the conveyor 20 is capable of transporting the bags 6 in the direction of arrow b, which is the same direction as the direction of arrow a of the first conveyor 7, and also in the direction of arrow c, as shown in FIGS. As shown in FIG. A shaping guide plate 21 is arranged at a position above the conveyance surface and close to the conveyance end of the first conveyor 7. The plate 21 supports the flap portion 2 of the bag body 6 over its entire width, and has a structure capable of applying a force to expand the flap portion 2 across its width. As illustrated in FIGS. 8 and 9, the main portion of the bag 6 is smoothly transferred from the conveying end of the first conveyor 7 onto the conveying surface of the second conveyor 20, and the flap portion 2 of the bag 6 is an inclined guide surface 21a for supporting the guide surface 21a;
Following this, there is a substantially upright guide surface 21b, and a second conveyor 2 that is further bent from the lower end of the guide surface 21b.
The air jet nozzle 30 has a structure that applies a force to expand the flap portion 2 in the width direction across the width direction. 2
It is provided approximately in the center of 1b. The nozzle 30 has a flat housing shape made of, for example, a thin metal plate, and has a ventilation passage 32 provided with jet ports 31, 31 opening parallel to both left and right sides of the guide surface 21b. The central rear part of the path 32 is the guide surface 21b.
A pressurized air pipe 33 protrudes from the back side of the unit, and a pressurized air pipe 33 is connected to the pressurized air through the ventilation path 32 to the jet ports 31 and 3.
1 is ejected as a band-shaped stream toward both left and right sides of the guide surface 21b. Of course, these structures and shapes are just examples,
It is not limited to the illustrated example. Further, although the second conveyor 20 illustrated in FIGS. 6 and 7 is inclined, it may be installed horizontally. Corresponding to the shaping guide plate 21, a flap folding arm 22 that can freely approach and separate from the plate 21 to bend the flap portion 2 is provided with a presser plate 23 at the tip as shown in the first figure.
The presser plate 23 comes into contact with the vicinity of the bag opening 1 of the bag body 6 transferred onto the second conveyor 20, and one end is swingable in the vertical direction by a pivot shaft 24 so as to fold in the flap part 2. It is arranged in such a way that it is pivotally supported.
The third cylinder 25 serves as a driving member for the same arm 22.
connected to. Further, a limit switch 26, for example, is provided above the second conveyor 20 as a sensing member for sensing that the bag 6 has been transferred onto the second conveyor 20. 6 is detected, the second conveyor 20
7, a reverse command is issued from the direction of arrow b in FIG. 6 to the direction of arrow c in FIG. At this time, the command to rotate the second conveyor 20 forward in the direction of arrow b, the command to raise the arm 22 to the third cylinder 25, and the command to stop air jetting to the air jetting nozzle 30 are each controlled by a timer. be made to do.

The automatic sealing of the flap portion 2 to the bag body 6 in the device according to the present invention according to the above embodiment is performed as follows. That is, as shown in the fourth diagram, material A
The bag body 6 containing the
The mold is placed on the first conveyor 7 with the mold facing backward and the release tape 4 facing upward, and conveyed in the direction of arrow a. At this time, the nip bar 10 is lowered into the conveyor 7 as shown by the solid line in FIG. and
Since the presser belt 16 is also in the raised position as shown by the solid line, the bag body 6 passes through the nip bar 10 position,
The bag body side enters the lower side of the presser belt 16. In this way, the forward end of the bag 6 becomes the emitter 19a and the receiver 1.
is sensed by the sensing member 9b, and
A rising command is sent to the first cylinder 11 and the second cylinder 18, and the presser belt 16 swings downward about the support shaft 17 to transport the bag body 6 while being held between it and the first conveyor 7. The nip bar 10 also rises and clamps the flap part 2, which is just passing over the nip bar installation position, between the peeling rollers 9 on the peeling base 8, so that the flap part 2 moves along the bar 10 as shown in the fifth figure. It progresses in a mountain shape,
When passing the apex of the nip bar 10, a slight peeling part is generated at the tip of the release tape 4, and the tip of the hook plate 12 engages with this peeling part.
The release tape 4 is attached to the plate 1 as the bag body 6 moves.
2, it is completely peeled off. The peeled tape 4 is removed and recovered to the outside by a suction means using a suction port 14 and a suction pipe 15. When the bag opening 1 of the bag 6 passes through the light emitters and receivers 19a and 19b, the nip bar 10 and presser belt 16 return to their original positions.

The bag body 6 that has reached the conveyance end of the first conveyor 7 is
As shown in FIG. 6, the bag 6 is smoothly transferred onto the second conveyor 20 via the support guide surface 21a of the shaping guide plate 21, and the conveyor 20 is moving in the direction of the arrow b in FIG. The bag 6 travels in the same direction and is received on the second conveyor 20, and the forward end of the bag 6 is sensed by the limit switch 26, and the arrow c in FIG.
A command to reverse the direction, a command to lower the arm to the third cylinder 25, and a command to eject air to the air jet nozzle 30 are issued. As a result, the flap folding arm 22 is moved to the third cylinder 25 as shown in FIG.
The presser plate 23 at the tip contacts the upper surface of the bag 6 near the bag opening 1, and the bag 6 advances in the direction of arrow c, and the shaping guide plate 21 The flap part 2 is folded over the bag opening 1 in an overlapping manner through the guidance of the flap part 2 from the supporting guide surface 21a to the guide surfaces 21b and 21c. When folding the bag, the bag may be folded double over the flap part 2 to the bag fabric on the bag opening 1 side, or it may be folded to the end of the material A stored in the bag body 6. However, it goes without saying that all of these fall within the scope of the folding operation of the guide plate 21 and the flap folding arm 22 of the present invention. Along with this folding, the bag body 6
As the whole bag moves in the direction of arrow c, the folded and overlapped bag opening 1 side of the flap part 2 moves forward in a pinched state between the guide surface 21c of the guide plate 21 and the conveying surface of the conveyor 20, and is reversed. flap part 2
Due to the adhesive structure of the double-sided adhesive tape 3, pressure-sensitive adhesive 5, etc. exposed by peeling off the release tape 4, the flap part 2 and the bag opening 1 are completely adhered, and the bag opening 1 is sealed. It will be discharged to the next process by the conveyor 20. Prior to such reversal and folding of the flap portion 2, when the flap portion 2 passes through the guide surface 21b of the shaping guide plate 21, the flap portion 2 extends from the jet ports 31, 31 of the air jet nozzle 30 over its entire length in the width direction. Moreover, by ejecting pressurized air in the direction of the outer extension, a tendency is given to the flap part to expand in the width direction over the entire width of the flap part, and the flap part 2 is folded over the bag opening 1. Because it is shaped into a tensioned shape immediately beforehand, there is no risk of wrinkles, deviation, distortion, or bending on the bag opening 1, and it is polymerized in a suitable spread shape, resulting in a uniform and beautiful adhesive shape and finish. be. Also, as illustrated in FIG. 7, the plate 2 of the conveyor 20
1 Unlike the bending side with arm 22, there is a spring 29 at one end.
If you use this together with a structure that swings freely,
Smooth pressing of the bag body 6 and securing of the passing posture can be achieved.

As already mentioned, the illustrated embodiment is an example of an adhesive structure having a release tape 4 as a safeguard, and if it does not have such a release tape 4, a third When the present invention is applied to a bag 6 of the type using only the pressure-sensitive adhesive 5 as exemplified in FIG. Needless to say, only the devices shown in FIGS. 6 to 9 are sufficient, and the second conveyor 20 also has a forward and reverse moving structure shown in FIGS. However, as mentioned earlier, this is due to the second conveyor 2.
0 is rotatable only in the direction of arrow c, and the first
The same effect can be achieved even if the bag body 6 conveyed from the conveyor 7 is received while the second conveyor 20 is stationary, the bag body 6 is detected by the limit switch 26 or other means, and the conveyor 20 is started only in the direction of arrow c. .
Further, the shaping guide plate 21 and its air ejection structure are not necessarily limited to the form shown in the figures, and design changes are free and belong to the present invention.

According to the device of the present invention, when bending and pasting the flap portion 2 on the bag opening 1, which is the biggest weak point in conventional mechanized sealing devices for the flap portion 2, the flap portion 2 can be manually sealed by the operator. Shaping and maintaining tension to properly tension the shape and prevent wrinkles or distortions are performed completely mechanically and automatically on the shaping guide plate 21, the flap folding arm 22, and the second conveyor 20, As a result, it is possible to stably obtain a uniform and beautiful finish on the flap seal appearance at the bag opening 1, and the series of operations can be performed extremely smoothly, which is a great advantage. It has great versatility as a sealing device,
It has excellent effects.

[Brief explanation of the drawing]

1 to 3 are explanatory diagrams of a bag to which the present invention is applied, and FIG. 4 is an overall side view of an embodiment of the present invention.
Figure 5 is a side view of the main part of the flap seal, Figures 6 and 7 are side views of the main part of the flap seal, Figure 8 is a slope view of an example of the shaping guide plate, and Figure 9 is a cutaway plan view of the same part. be. 1...Bag opening, 2...Flap part, 6...Bag body,
7...First conveyor, 20...Second conveyor, 2
DESCRIPTION OF SYMBOLS 1... Shaping guide plate, 22... Flap folding arm, 23... Pressing plate, 30... Air jet nozzle, 31... Spout nozzle.

Claims (1)

[Scope of utility model registration request] A first conveyor that conveys bags in one direction with the flap portion at the rear, and a first conveyor that is disposed continuously with and below the conveyor and conveys bags received from the conveyor in at least a direction opposite to the conveying direction of the first conveyor. a second conveyor disposed between the conveying end of the first conveyor and the conveying surface of the second conveyor, supporting the flap portion of the bag body received on the second conveyor, and supporting the flap portion of the bag body received on the second conveyor; It is characterized by comprising a shaping guide plate equipped with an air injection means for expanding in the width direction, and a flap folding arm that is disposed so as to be able to move toward and away from the plate and fold and overlap the flap portion onto the bag opening. Automatic bag sealing device.