JP2021014275A - Expanding apparatus of gusset bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate filling of a gusset bag with an object to be packaged by autonomously maintaining the gusset bag in an expanded state when filling the gusset bag with an object to be packaged. SOLUTION: The gusset bag 3 is equipped with a rotary packaging device 1 or the like that automatically fills and seals the gusset bag 3 with the gusset bag 3 while rotating intermittently, and fills the gusset bag 3 with the gusset bag 3. The expansion device 20 is an expansion device 20 that moves the gusset bag expansion device main body 20A up and down, and a first arm 23L that is inserted into the gusset bag 3 to open the gusset bag 3 gusset 3B to the left and right. A first arm 23R, an air cylinder 22 for opening and closing the first arm 23L and the second arm 23R to the left and right, and a roller 25 attached to the tips of the first arm 23L and the second arm 23R. The arm 23L and the second arm 23R push the gusset bag 3 out until it exceeds the folding dead point of the folding gusset 3B at the bottom of the gusset bag 3. [Selection diagram] Fig. 3

Description

The present invention relates to a gusset bag expanding device capable of autonomously maintaining the expanded state after expanding the gusset bag.

Gusset bags are known as a type of packaging material. This gusset bag is provided with a so-called "gusset" by folding on the side surface of the bag body for the purpose of increasing the storage volume. When filling the gusset bag with the object to be packaged, air is blown into the gusset bag to expand the gusset of the gusset bag so that the object to be packaged can easily enter.

However, if the gusset bag has a crease, even if air is blown in and the so-called gusset on the side of the main body is temporarily expanded and expanded, when the air blowing is stopped, the gusset part is restored by folding. Therefore, there is a problem that it is difficult to fill the packaged object because it tries to return to the folded state.

In order to prevent this, as shown in FIGS. 2 (a) to 2 (f) of Patent Document 1, after opening the bag mouth, the bag opening block is inserted, and when the bag is opened to the bottom, the state remains as it is. Both outer surfaces of the bottom of the bag are attracted and supported by suction cups to prevent shrinkage due to folding and restoration, and the bag to be packed is filled.

JP-A-5-254517

However, as in Patent Document 1, in order to forcibly maintain the expanded state with a suction cup after expanding the gusset bag, the packaging device must be further provided with a mechanism like a suction cup. There was a problem that it became complicated and costly. Furthermore, the position of the suction cup also needs to be adjusted each time the size of the gusset bag changes, which is troublesome.

In order to solve the above problems, the present invention solves the above problems. When the gusset bag is expanded, once it is expanded, the gusset bag is autonomously expanded and maintained without using a mechanism such as a suction cup, and then to be packaged. It is an object of the present invention to provide a gusset bag expanding device that can easily perform a filling operation of an object.

The gusset bag expanding device of the present invention is a gusset bag expanding device that expands a gusset bag having a gusset for folding on a side surface, and the gusset bag expanding device is a gusset bag expanding device. An elevating mechanism that moves the opening device body up and down, a first arm and a second arm that are inserted into the gusset bag to open the gusset bag gusset to the left and right, and the first arm and the second arm to be opened and closed to the left and right. The gusset for folding the bottom of the gusset bag is folded back by the first arm and the second arm to which the actuator and the rollers attached to the tips of the first arm and the second arm are provided and the rollers are attached. It is characterized by spreading the gusset bag until it exceeds the dead point.

In this gusset bag expanding device, the expanding radius of the first arm and the second arm exceeds the folding dead point of the gusset of the gusset bag, and the first arm and the second arm are the gusset bag. When inserted inside and expanded in opposite directions, the gusset bag gusset does not return to its original state after expanding.

According to the above-described configuration, the gusset bag is expanded in the opposite direction beyond the folding dead center of the so-called gusset prior to filling the packaged object, so that once expanded, the gusset bag returns to its original position. There is no need for a means to support the expanded state with a suction cup from outside the gusset bag.

The structure of the gusset bag expanding device of the present invention is greatly simplified, and at the same time, it has the effect of facilitating the filling work of the object to be packaged later.

Schematic plan view of a rotary packaging device equipped with a gusset bag expanding device of the present invention. Schematic plan view of the gusset bag expanding device of the present invention Front view of the gusset bag expanding device of the present invention Partial enlarged view of the main body of the gusset bag expanding device of the present invention AA arrow view of FIG. Top view of FIG. Front view of Example 2 of the gusset bag expanding device main body of the present invention Top view of Example 3 of the gusset bag expanding device of the present invention

Hereinafter, the gusset bag expanding device of the present invention will be described based on the above drawings. However, it goes without saying that the present invention is not limited to the best mode for carrying out the present invention.

In FIG. 1, reference numeral 1 denotes a rotary wrapping device, and a bagging device 2 for inserting an object to be packaged into a bag is arranged adjacent to the rotary wrapping device 1.

The rotary packaging device 1 has a structure capable of performing some packaging work every 45 degrees. For example, at the position (A) on the outer circumference of the octagonal rotating rotor, the gusset bag 3 is delivered to the chuck 6 from the bag feeding device 4 via a suction device 5 that rotates 90 °.

At the position (B), the gusset bag mouth 3A is sucked and opened only by the suction cup 6C by the chuck 6, and air is blown from the nozzle 7 to inflate the gusset bag 3. However, the nozzle 7 is not always necessary.

At the position (C), the gusset fold of the gusset bag 3 is widened by the expanding device of the gusset bag 3 of the present invention. Immediately after that, while the gusset bag 3 is shifting from the position (C) to the position (D), the operating portion 6A of the chuck 6 bends downward at the hinge portion 6B, and the gusset bag 3 is converted from the vertical to the horizontal posture to perform the gusset. Turn the bag mouth 3A sideways. In order to keep the entire gusset bag 3 in a horizontal state, it is supported from under the gusset bag 3 with a comb-shaped support (not shown).

At the position (D), the main pusher 8 of the bagging device 2 is used to fill the gusset bag 3 horizontally supported by the support tool with the packaged object 9. The bagging device 2 is installed between two parallel chains 16 and 17 in which a boat-shaped support base 12 is bridged to sprockets 14 and 15 as a caterpillar type conveyor 13. The object to be packaged 9 is placed on the support table 12 by an operator, and the plurality of the support tables 12 rotate like a conveyor to convey the object to be packaged 9.

At the position (E), the operating portion 6A rotates 90 ° horizontally from the hinge portion 6B, and the gusset bag 3 attracted to the suction cup 6C of the chuck 6 is suspended in a vertical state.

At the position (F), the gusset bag opening 3A vertically suspended by the chuck 6 is sealed by the sealing device 10.

At the position (G), the bag body of the gusset bag 3 with the gusset bag opening 3A sealed is discharged by the discharge conveyor 11.
Next, the gusset bag expanding device 20 of the present invention will be described in detail. As described above, the gusset bag expanding device 20 is arranged in the section (C) of the rotary packaging device 1 of FIG.

As shown in FIG. 2, the gusset bag expanding device 20 is supported by a horizontal support rod 19 attached to the upper part of a pole 18 erected on the outer peripheral portion of the section (C) of the rotary packaging device 1. There is. As shown in FIG. 3, the crank mechanism (not shown) constituting the elevating mechanism housed in the base 1A is configured to move the elevating shaft 18A of the pole 18 up and down, and at the same time as the gusset bag 3 is intermittently stopped. , The gusset bag expanding device main body 20A is arranged so as to be able to descend in the direction indicated by the arrow W in FIG.

As shown in FIGS. 3 and 4, a mounting plate 21 is attached to the tip of the support rod 19. The mounting plate 21 is composed of a substantially tapered main body portion 21A on the support rod 19 side and a substantially C-shaped tip portion 21B on the tip end side of the main body portion 21A, and is perpendicular to the upper edge of the main body portion 21A. A bent mounting piece 21C is formed, and the mounting piece 21C is fixed to the upper surface of the support rod 19. Therefore, the elevating movement of the elevating shaft 18A is transmitted to the mounting plate 21 via the support rod 19, and the gusset bag expanding device main body 20A moves up and down in the vertical direction.

An actuator 22 such as an air cylinder is horizontally mounted on the upper side of the main body portion 21A of the mounting plate 21. The first arm 23L and the second arm 23R, which are driven to open and close by the actuator 22, are attached to the tip portion 21B of the mounting plate 21. As shown in FIG. 4, the first arm 23L and the second arm 23R have a figure eight shape as shown by an arrow Q from a parallel state to a state in which a so-called gusset at the bottom of the gusset bag 3 projects laterally. Expand.

The first arm 23L is connected to the first rotation shaft 24L via the bracket 23l, and the second arm 23R is connected to the second rotation shaft 24R via the bracket 23r. As shown in FIG. 5, in the second rotating shaft 24R, the bearing 24r is horizontally fixed to the mounting plate 21, and the rotating shaft 241r is pivotally supported in the bearing 24r. The first rotating shaft 24L is structurally the same as the second rotating shaft 24R.

Rollers 25 and 25 are provided at the lower ends of the first and second arms 23L and 23R. The centers of the rollers 25 and 25 are located outside the central axes 23C of the first and second arms 23L and 23R (see FIG. 4). It is preferable that the outer peripheral portions of the rollers 25 and 25 are located outside the central axes 23C of the first and second arms 23L and 23R.

With the above configuration, when the arms 23L and 23R are expanded, the tip protrudes until it exceeds the folding dead center of the gusset bag 3 without damaging both sides of the bottom of the gusset bag 3, and pushes the gusset bag 3 gusset 3B. spread. Therefore, unlike the conventional gusset bag 3, the gusset 3B does not return to its original position due to the folding habit.

The roller 25 is made of synthetic resin, has a larger diameter on both sides than the center as shown in FIG. 5, and is rotatably supported by an inverted L-shaped bracket. The roller 25 is not limited to the synthetic resin. Further, the roller 25 is not limited to the roller 25 having the above-mentioned shape, and may have a columnar shape having the same diameter, or may have a shape with a bulging center or a spherical shape. Further, the roller 25 is rotatably supported by an inverted L-shaped brat with a shaft, but may not rotate.

A link mechanism 26 is provided between the actuator 22, the first arm 23L, and the second arm 23R to convert the reciprocating motion of the actuator 22 into a rotational motion and transmit it. That is, one end of a substantially V-shaped lever arm 26A is connected to the tip of the piston rod 22A protruding from the actuator 22 by a pin 26B. The V-shaped bent portion of the lever arm 26A is rotatably supported by the first rotation shaft 24L, and rotates about the first rotation shaft 24L by moving the piston rod 22A back and forth. When the first rotation shaft 24L is rotated by the rotation of the lever arm 26A, the first arm 23L is also rotated accordingly.

One end of the connecting rod 26D is connected to the other end of the lever arm 26A by a pin 26C, and the other end of the connecting rod 26D is connected to the lower portion of the substantially triangular rotating arm 26F via the pin 26E. The upper part of the rotary arm 26F is rotatably supported by the second rotary shaft 24R, and rotates around the second rotary shaft 24R.

With the above configuration, when the piston rod 22A moves back and forth, the lever arm 26A rotates and the first arm 23L rotates. Further, the rotation of the lever arm 26A is transmitted to the rotating arm 26F via the connecting rod 26D to rotate the second rotating shaft 24R, and the second arm 23R also rotates in the opposite direction to the first arm 23L. To do.

A stroke adjusting mechanism for adjusting the stroke of the piston rod 22A of the actuator 22 is provided at the upper tip portion of the mounting plate 21 having a substantially C shape. Reference numeral 27 denotes an adjusting screw of the stroke adjusting mechanism for adjusting the rotation range. Further, an adjusting screw 26e for adjusting the rotation range of the arm 23R is provided on the connecting rod 26D, and the rotation angle of the second arm 23R can be adjusted to be appropriate.

Next, the operation of the gusset bag expanding device will be described.
First, when the gusset bag 3 in which the gusset bag opening 3A is opened in the section (B) in FIG. 1 stops at the section (C), the elevating shaft 18A of the pole 18 is lowered and closed from the upper part of the opening of the gusset bag 3. The first arm 23L and the second arm 23R of the above are inserted into the gusset bag 3.

When the lower ends of the first arm 23L and the second arm 23R are lowered to near the bottom of the gusset bag 3, the piston rod 22A of the actuator 22 is projected. Due to the movement of the piston rod 22A, the lever arm 26A rotates clockwise around the first rotation shaft 24L, and the first arm 23L also rotates in the same direction.

At the same time, the rotating arm 26F also rotates counterclockwise via the connecting rod 26D connected to the tip of the lever arm 26A, and the second rotating shaft 24R connected to the rotating arm 26F rotates and the second rotation. The second arm 23R connected to the moving shaft 24R also rotates counterclockwise in FIG.

As described above, as the first arm 23L and the second arm 23R expand to the left and right, the rollers 25 and 25 provided at the lower ends of the first arm 23L and the second arm 23R form the so-called gusset bag 3 so-called gusset 3B. Expand the polygonal line outward. Therefore, as shown in FIG. 4, both fold line portions of the gusset 3B of the gusset bag 3 are expanded outward beyond the dead center of the fold where the gusset 3B does not return to the original state due to the folding habit. When the gusset 3B expands to the dead center of the fold, the fold line of the gusset 3B cannot be restored, so that the expanded state of the bottom of the gusset bag 3 is maintained.

In the process of transitioning from the section (C) to (D) shown in FIG. 1 in the above state, the gusset bag 3 is changed from the vertical posture to the horizontal posture, and the gusset bag mouth 3A is turned laterally. Even if the posture of the gusset bag 3 is changed in this way, the expanded state of the bottom of the gusset bag 3 is maintained. Therefore, in the position (D), the main pusher 8 of the bagging device 2 is used to smoothly fill the gusset bag 3 horizontally held by the support tool with the packaged object 9.

After the object to be packaged is filled in the section (D), the gusset bag 3 is returned vertically in the section (E), and the gusset bag mouth 3A is sealed by the sealing device 10 in the section (F). Further, in the section (G), the bag body in which the gusset bag opening 3A is sealed and the object to be packaged 9 is packaged is discharged by the discharge conveyor 11.

Although the case where the gusset bag expanding device 20 is equipped in the rotary packaging device 1 is shown, the present invention is not limited to this, and the linear packaging device may be equipped. Further, the rotary packaging device 1 has a configuration in which the gusset bag 3 is changed from the vertical position to the horizontal posture and the gusset bag mouth 3A is directed in the lateral direction, but the gusset bag 3 is filled with the object to be packaged 9 in a vertical state. It may be.

FIG. 7 is a front view showing a part of the gusset bag expanding device main body 20A of the second embodiment. The same reference numerals are used for the members having the same functions as those in the first embodiment, and the description thereof will be omitted. The difference between the first embodiment and the second embodiment is that a pair of fan-shaped gears 28 are used instead of the link mechanism 26. One sector gear 28A is attached to the first rotating shaft 24L, the other fan gear 28B is attached to the second rotating shaft 24R, and one and the other fan gears 28A and 28B are meshed with each other.

When the piston rod 22A of the actuator 22 moves back and forth, the lever arm 26A rotates about the first rotation shaft 24L, and the first arm 23L attached to the first rotation shaft 24L via a bracket rotates. To do.

When the lever arm 26A rotates, one fan-shaped gear 28A integrated with the lever arm 26A rotates about the first rotation shaft 24L. At the same time, the other sector gear 28B, which meshes with one sector gear 28A, rotates about the second rotation shaft 24R, and the second arm 23R attached to the second rotation shaft 24R via a bracket It rotates in the direction opposite to that of the first arm 23L.

As described above, the first rotation shaft 24L and the second rotation shaft 24R rotate in opposite directions, so that the first arm 23L attached to the first rotation shaft 24L and the second rotation shaft 24R And the second arm 23R open and close in the opposite direction, and the rollers 25 and 25 widen the so-called gusset 3B fold line of the gusset bag 3 outward in the same manner as in the first embodiment, based on the gusset 3B fold line. I can't go back.

FIG. 8 is a front view showing the gusset bag expanding device 20 of the third embodiment. The same reference numerals are used for members having the same function, and the description thereof will be omitted. In the third embodiment, the support rod 30 is attached downward to the tip of the mounting plate 29, and the gusset bag expanding device main body 20A of the third embodiment is provided at the lower end of the support rod 30.

The existing air chuck 31 is used for the gusset bag expanding device main body 20A of the third embodiment. There are various types of air chucks 31, but any type may be used as long as the first arm 23L and the second arm 23R open and close to the left and right. Specifically, a cam type air chuck, a toggle type air chuck, a gear type air chuck, or the like may be used. The opening and closing of the finger portion 31A of the chuck is ideally 180 °, but is not limited to 180 °.

The first arm 23L and the second arm 23R with rollers 25 and 25, which are the same as those in the first and second embodiments, are attached to the finger portion 31A of the air chuck. If the bag size is different, the first arm 23L and the second arm 23R are replaced.

The air chuck 31 introduces squeezed air into the air chuck 31 through the air tube 31B, opens the finger portion 31A, and opens the first arm 23L and the second arm 23R.

It can be widely used in devices such as rotary packaging devices that automatically expand the gusset bag and fill the bag in that state with the object to be packaged.

1 Rotary packaging device, 1A base, 2 bagging device, 3 gusset bag, 3A gusset bag mouth, 3B gusset, 4 bag supply device, 5 suction device, 6 chuck, 6A actuator, 6B hinge, 6C suction machine, 7 Nozzle, 8 Main pusher, 9 Packaged object, 10 Sealing device, 11 Discharge conveyor, 12 Boat-shaped support, 13 Caterpillar-shaped conveyor, 14,15 Sprocket, 16,17 chain, 18 pole, 18A lifting shaft, 19 Support rod, 20 gusset bag expansion device, 20A gusset bag expansion device main body, 21 mounting plate, 21A main body part, 21B tip part, 21C mounting piece, 22 actuator (air cylinder), 22A piston rod, 23L 1st Arm, 23l bracket, 23R 2nd arm, 23r bracket, 23C center axis, 24L 1st rotation shaft, 24R 2nd rotation shaft, 24r bearing, 25 rollers, 26 link mechanism, 26A lever arm, 26B pin, 26C pin , 26D connecting rod, 26E pin, 26e adjust screw, 26F rotary arm, 27 adjust screw, 28 fan-shaped gear, 28A one fan-shaped gear, 28B other fan-shaped gear, 29 mounting plate, 30 support rod, 31 actuator (air chuck) ), 31A finger part, 31B air tube

Claims (4)

A gusset bag expansion device that expands a gusset bag with a gusset for folding on the side surface.
The gusset bag expanding device includes an elevating mechanism that moves the gusset bag expanding device body up and down, a first arm and a second arm that are inserted into the gusset bag and open the gusset bag gusset to the left and right, and the above. An actuator for opening and closing the first arm and the second arm to the left and right, and a roller attached to the tips of the first arm and the second arm are provided.
A gusset bag expanding device characterized in that the first arm and the second arm to which the roller is attached pushes the gusset bag until it exceeds the folding dead center of the gusset for folding the bottom of the gusset bag. .. The actuator that opens and closes the first arm and the second arm to the left and right is an air cylinder, and the driving force of the air cylinder is transmitted to the first arm and the second arm via a crank mechanism or a fan-shaped gear. The gusset bag expanding device according to claim 1, wherein the gusset bag is opened and closed from side to side. The actuator that drives the opening and closing of the first arm and the second arm to the left and right is an air chuck, and the first arm and the second arm attached to the finger portion of the air chuck are directly opened and closed by the air chuck. The gusset bag expanding device according to claim 1. The rollers of the first arm and the second arm are wheel-shaped, the wheel-shaped rollers rotate or do not rotate, and the center of the rollers is the central axes of the first arm and the second arm. The gusset bag expanding device according to claim 1, or 2, or 3, wherein the gusset bag is located outside.