JP7285555B2 - Gusset bag expansion device - Google Patents

Description

Patent Act Article 30, Paragraph 2 applies 1) Sales destination: Kansai Allied Coffee Roasters Co., Ltd. 2) Date of sale: June 22, 2019 3) Seller: Furukawa Seisakusho Co., Ltd. 4) Place of sale: Kansai Allied Coffee Roasters Co., Ltd. Osaka Factory

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gusseted bag expanding device capable of autonomously maintaining the expanded state after the gusseted bag has been expanded.

A gusset bag is known as one type of packaging material. This gusset bag is provided with so-called "gussets" formed by folds on the sides of the bag body for the purpose of increasing the storage capacity. When the gusset bag is filled with the object to be packaged, air is blown into the gusset bag to widen the gusset so that the object can easily enter the gusset bag.

However, if the gusset bag has a crease, even if air is blown in to temporarily widen the so-called gusset on the side of the main body and expand it, when the blowing of air is stopped, the gusset part is folded and has a restoring force. There is a problem in that it tends to return to the folded state again, making it difficult to fill the package.

In order to prevent this, as shown in FIGS. 2(a) to 2(f) of Patent Document 1, after opening the bag opening, a bag opening block is inserted, and when the bag is opened to the bottom, it remains in that state. Suction cups are used to suck and support both outer sides of the bottom of the bag to prevent shrinkage due to refolding and to fill the bag with the items to be packaged.

Japanese Patent Laid-Open No. 5-254517

However, in order to forcibly maintain the expanded state with the suckers after the gusset bag is expanded, as in Patent Document 1, a mechanism such as a sucker must be further provided in the packaging apparatus. There is a problem that it becomes complicated and the cost increases. Furthermore, the position of the suction cups also needs to be adjusted each time the size of the gusset bag changes, which is troublesome.

In order to solve the above-mentioned problems, the present invention, when the gusseted bag is expanded, once expanded, the gusseted bag is automatically expanded and maintained without using a mechanism such as a suction cup, and after that, the gusseted bag is kept expanded. It is an object of the present invention to provide a device for expanding a gusseted bag which facilitates the filling operation.

A gusset bag expanding device according to the present invention is a gusset bag expanding device that expands a gusset bag having gussets for folding formed on the side surfaces thereof. A lifting mechanism for lifting and lowering the opening device main body, a first arm and a second arm that are inserted into the gusset bag to open the gusset of the gusset bag to the left and right, and drive to open and close the first arm and the second arm to the left and right. An actuator and rollers attached to the ends of the first arm and the second arm are provided, and the gusset for folding the bottom of the gusset bag is folded by the first arm and the second arm to which the rollers are attached. It is characterized in that the gusseted bag is spread out to the point where it does not return to its original state due to its habit .

In this gusset bag expanding device, the expansion radii of the first arm and the second arm push the gusset bag to the point where the gusset of the gusset bag expands outward and does not return to its original state due to the crease. When the first arm and the second arm are inserted into the gusset bag and expanded in opposite directions, the gusset of the gusset bag expands and then returns to its original state. do not have.

According to the present invention, the gusset bag is opened in the opposite direction to the point where the folded portion of the gusset does not return to its original state due to the crease prior to the filling of the item to be packaged. The gusset bag does not return to its original position, and means for supporting the expanded state with suction cups from the outside of the gusset bag becomes unnecessary.

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 subsequent filling operation of the objects to be packaged.

FIG. 1 is a schematic plan view of a rotary packaging machine equipped with the gusset bag expanding device of the present invention; 1 is a schematic plan view of a gusset bag expanding device of the present invention; FIG. FIG. 2 is a front view of the gusset bag expansion device of the present invention; FIG. 2 is a partially enlarged view of the gusset bag expanding device main body of the present invention; AA arrow view in FIG. Plan view of FIG. FIG. 2 is a front view of Embodiment 2 of the gusseted bag expanding device main body of the present invention; Fig. 3 is a plan view of Embodiment 3 of the gusset bag expanding device of the present invention;

In the following, the gusseted bag expanding device of the present invention will be described with reference to the above drawings. However, it goes without saying that the present invention is not limited to the best mode for carrying out this invention.

In FIG. 1, reference numeral 1 denotes the rotary packaging machine. Adjacent to the rotary packaging machine 1, a bagging machine 2 for inserting the articles to be packaged into bags is arranged.

The rotary packaging machine 1 has a structure capable of performing some kind of packaging operation every 45 degrees. For example, at the position (A) on the outer periphery of the octagonal rotating rotor, the gusseted bag 3 is transferred from the bag feeder 4 to the chuck 6 via the suction device 5 rotated by 90°.

At the position (B), the chuck 6 sucks and opens the gusset bag mouth 3A only with the suction cup 6C, and air is blown from the nozzle 7 to inflate the gusset bag 3. However, the nozzle 7 is not necessarily required.

At the position (C), the gusset folds of the gusset bag 3 are spread by the gusset bag 3 spreading device of the present invention. Immediately after that, while the gusset bag 3 is moving from position (C) to position (D), the actuating portion 6A of the chuck 6 bends downward at the hinge portion 6B, transforming the gusset bag 3 from vertical to horizontal, and gusseting. The bag opening 3A is turned laterally. In order to keep the entire gusset bag 3 in a horizontal state, the gusset bag 3 is supported from below by a comb-like support (not shown).

At the position (D), the main pusher 8 of the bagging device 2 is used to fill the gusseted bag 3 horizontally supported by the supporting member with the articles 9 to be packaged. In the bagging device 2 , a boat-shaped support base 12 is suspended between two parallel chains 16 and 17 that span sprockets 14 and 15 as caterpillar-shaped conveyors 13 . An operator places the articles 9 to be packaged on the support table 12 , and the plurality of support tables 12 rotate like a conveyor to convey the articles 9 to be packaged.

At the position (E), the operating portion 6A is rotated horizontally by 90° from the hinge portion 6B, and the gusset bag 3 sucked by the suction cup 6C of the chuck 6 is suspended vertically.

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

At the position (G), the bag body of the gusset bag 3 with the gusset bag opening 3A sealed is discharged by the conveyor 11 for discharge.
Next, the gusset bag expanding device 20 of the present invention will be described in detail. As mentioned above, the gusset bag expanding device 20 is located in section (C) of the rotary packaging machine 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 top of a pole 18 erected on the outer periphery of the section (C) of the rotary packaging machine 1. there is As shown in FIG. 3, a lifting shaft 18A of the pole 18 is moved up and down by a crank mechanism (not shown) that constitutes a lifting mechanism housed in the base 1A. , the main body 20A of the gusseted bag expanding device can be lowered 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. As shown in FIGS. The mounting plate 21 is composed of a substantially tapered body portion 21A on the support rod 19 side and a substantially C-shaped tip portion 21B on the tip side of the body portion 21A. A bent attachment piece 21C is formed, and this attachment piece 21C is fixed to the upper surface of the support rod 19. As shown in FIG. Therefore, the up-and-down motion 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.

An actuator 22 such as an air cylinder is horizontally attached to the upper portion of the main body portion 21A of the mounting plate 21. As shown in FIG. A first arm 23L and a second arm 23R, which are driven to open and close by an actuator 22, are attached to the tip portion 21B of the mounting plate 21. As shown in FIG. As shown in FIG. 4, the first arm 23L and the second arm 23R are arranged in a figure-of-eight shape as indicated 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 protrudes laterally. expand.

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

Further, rollers 25, 25 are provided at the lower ends of the first and second arms 23L, 23R. The centers of the rollers 25, 25 are located outside the center axes 23C of the first and second arms 23L, 23R (see FIG. 4). It is preferable that the rollers 25, 25 have wheel-shaped outer peripheries located outside the center axes 23C of the first and second arms 23L, 23R.

With the above structure, when the arms 23L and 23R are expanded, the tips of the arms 23L and 23R do not damage both sides of the bottom of the gusset bag 3, and the folded portion of the gusset 3B is protruded to the point where it does not return to its original state due to the crease. , the gusset 3B of the gusset bag 3 is expanded. Therefore, unlike the conventional gusset bag 3, the gusset 3B does not return to its original shape due to the crease.

The roller 25 is made of a synthetic resin, and as shown in FIG. 5, has a larger diameter on both sides than the center, and is rotatably supported by an inverted L-shaped bracket. The roller 25 is not limited to synthetic resin. Further, the roller 25 is not limited to the roller 25 having the shape described above, and may be cylindrical with the same diameter, or may have a shape with a swollen center or a spherical shape. Furthermore, although the roller 25 is rotatably supported by the inverted L-shaped bracket, it may not be rotatable.

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

One end of a 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 bottom of a substantially triangular rotating arm 26F via a pin 26E. The rotating arm 26F has an upper portion rotatably supported by the second rotating shaft 24R, and rotates about the second rotating shaft 24R.

With the above configuration, when the piston rod 22A moves forward and backward, the lever arm 26A rotates and the first arm 23L rotates. Further, the rotation of the lever arm 26A is transmitted to the rotation arm 26F via the connecting rod 26D, and the second rotation shaft 24R rotates. do.

A stroke adjusting mechanism for adjusting the stroke of the piston rod 22A of the actuator 22 is provided at the upper end portion of the substantially C-shaped mounting plate 21. As shown in FIG. Reference numeral 27 denotes an adjusting screw of a 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 so that the rotation angle of the second arm 23R can be adjusted appropriately.

Next, the operation of the expansion device for the gusset bag will be described. First, the gusset bag 3 with the gusset bag mouth 3A opened in section (B) in FIG. The first arm 23L and the second arm 23R are inserted into the gusset bag 3.

When the lower ends of the first arm 23L and the second arm 23R descend near the bottom of the gusset bag 3, the piston rod 22A of the actuator 22 protrudes. Due to this movement of the piston rod 22A, the lever arm 26A rotates clockwise in FIG. 4 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 through 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. The second arm 23R connected to the drive shaft 24R also rotates counterclockwise in FIG.

As described above, the first arm 23L and the second arm 23R spread laterally so that the rollers 25, 25 provided at the lower ends of the first arm 23L and the second arm 23R move the so-called gusset 3B of the gusset bag 3. Expand the fold line of the to the outside. For this reason, as shown in FIG. 4, both folding line portions of the gusset 3B of the gusset bag 3 are expanded outward until the gusset 3B does not return to its original state due to the crease. If the gusset 3B is expanded to the point where it cannot return to its original state , the folding line of the gusset 3B will not return to its original state, so the expanded state of the bottom of the gusset bag 3 is maintained.

During the transition from section (C) to section (D) shown in FIG. 1 in the above state, the gusset bag 3 is changed from vertical to horizontal, and the gusset bag opening 3A is oriented laterally. Even if the posture of the gusset bag 3 is changed in this way, the expanded state of the bottom portion of the gusset bag 3 is maintained. Therefore, at the position (D), the main pusher 8 of the bagging device 2 is used to smoothly fill the gusseted bag 3 horizontally held by the supporting member with the items 9 to be packaged.

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

Although the gusset bag expanding device 20 is installed in the rotary packaging machine 1, it is not limited to this, and may be installed in a linear packaging machine. In addition, the rotary type packaging apparatus 1 is configured such that the gusset bag 3 is converted from a vertical posture to a horizontal posture, and the gusset bag opening 3A is oriented in the horizontal direction, but the gusset bag 3 is in a vertical state, and the object to be packaged 9 is filled. may be of

FIG. 7 is a front view showing a part of the main body 20A of the gusset bag expanding device according to the second embodiment. Members having the same functions as those in the first embodiment are denoted by the same reference numerals, and descriptions thereof are omitted. A difference between the first embodiment and this second embodiment is that a pair of sector gears 28 are used in place of the link mechanism 26 . One sector gear 28A is attached to the first rotation shaft 24L, the other sector gear 28B is attached to the second rotation shaft 24R, and the one and the other sector gears 28A and 28B mesh with each other.

When the piston rod 22A of the actuator 22 moves forward and backward, the lever arm 26A rotates about the first rotation shaft 24L, and the first arm 23L attached to the first rotation shaft 24L via the bracket 23l rotates. move.

When the lever arm 26A rotates, one sector gear 28A integrated with the lever arm 26A rotates around the first rotation shaft 24L. At the same time, the sector gear 28B meshing with the sector gear 28A rotates about the second rotation shaft 24R, and the second arm 23R attached to the second rotation shaft 24R via the bracket 23r rotates. rotates in a direction opposite to that of the first arm 23L.

As described above, by rotating the first rotating shaft 24L and the second rotating shaft 24R in opposite directions, the first arm 23L attached to the first rotating shaft 24L and the second rotating shaft 24R is rotated. , the second arm 23R opens and closes in the opposite direction, and the rollers 25, 25 expand the fold line of the gusset 3B of the gusset bag 3 toward the outside in the same manner as in the first embodiment. won't go back.

FIG. 8 is a front view showing the gusset bag expanding device 20 of the third embodiment. Members having the same functions are denoted by the same reference numerals, and descriptions thereof are omitted. In the third embodiment, a supporting 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 supporting rod 30. As shown in FIG.

An existing air chuck 31 is used for the main body 20A of the gusset bag expanding device of the third embodiment. Although there are various types of the air chuck 31, any type may be used as long as the first arm 23L and the second arm 23R can be opened and closed from side to side. 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°.

A first arm 23L and a second arm 23R with rollers 25, 25 similar to 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 exchanged.

Compressed air is introduced into the air chuck 31 through an air tube 31B to open the finger portions 31A, thereby opening the first arm 23L and the second arm 23R.

It can be widely used in a device such as a rotary type packaging device that automatically expands a gusseted bag and fills the bag in that state with an item to be packaged.

1 rotary packaging device 1A base 2 bagging device 3 gusset bag 3A gusset bag opening 3B gusset 4 bag feeding device 5 suction device 6 chuck 6A operation part 6B hinge part 6C suction cup 7 nozzle, 8 main pusher, 9 object to be packaged, 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 Attachment plate 21A Main body portion 21B Tip portion 21C Attachment piece 22 Actuator (air cylinder) 22A Piston rod 23L First Arm, 23l Bracket, 23R Second Arm, 23r Bracket, 23C Center Axis, 24L First Rotational Axis, 24R Second Rotational Axis, 24r Bearing, 25 Roller, 26 Link Mechanism, 26A Lever Arm, 26B Pin, 26C Pin , 26D connecting rod, 26E pin, 26e adjusting screw, 26F rotating arm, 27 adjusting screw, 28 sector gear, 28A one sector gear, 28B other sector gear, 29 mounting plate, 30 support rod, 31 actuator (air chuck ), 31A finger part, 31B air tube

Claims (4)

A gusset bag expanding device for expanding a gusset bag having gussets for folding formed on the side surface,
The gusset bag expanding device includes an elevating mechanism that moves up and down a gusset bag expanding device main body, first and second arms that are inserted into the gusset bag to open the gusset of the gusset bag to the left and right, and An actuator that opens and closes the first arm and the second arm to the left and right, and a roller attached to the tip of the first arm and the second arm,
A gusset bag characterized in that the first arm and the second arm to which the rollers are attached spread the gusset bag to the point where the gusset for folding the gusset bag does not return to its original state due to the crease. expansion device. An actuator for opening and closing 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 sector gear. 2. The gusseted bag expanding device according to claim 1, wherein the gusseted bag is opened and closed from side to side. The actuator for opening and closing 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 portions of the air chuck are directly opened and closed by the air chuck. The expanding device for a gusseted bag according to claim 1. The rollers of the first and second arms are wheel-shaped, and the wheel-shaped rollers rotate or do not rotate, and the centers of the rollers are center axes of the first and second arms. 4. The gusseted bag expanding device according to claim 1, wherein the expanding device is positioned further outward.

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