JP2020186041A - Bag mouth shaping and sealing device - Google Patents

Abstract

To provide a bag mouth shaping and sealing device that seals a flat opening that is flattened by sandwiching left and right opening side edges with upper and lower grippers and pulling it sideways while expanding an opening of a self-supporting bag with flexible rigidity with an expansion bar by sandwiching it up and down.SOLUTION: An opening of a self-supporting bag 1, which has been conveyed horizontally by a one-side inclined belt conveyor 2 to a sealing seal stop position, is preliminarily flattened by expanding left and right expansion bars 4, and the preliminarily flattened state remains. Upper and lower grippers 6 sandwich left and right side edges of the opening and expand it to the left and right to make it completely flat, and then a seal bar 8 seals the opening of the self-standing bag 1.SELECTED DRAWING: Figure 1

Description

The present invention relates to a bag mouth shaping and sealing device that sandwiches the left and right side edges of an opening of a self-standing bag having flexible rigidity and pulls it sideways to flatten the opening, and seals the opening in a flat state.

Conventionally, even if you try to seal the opening after filling a thin and weak plastic bag with the package, it is extremely difficult to seal the opening cleanly without wrinkles because the bag is soft and weak. Met.
Therefore, there is known a "packaging method using a bag" that enables the opening end of a thin plastic bag filled with a packaged product to be sealed without wrinkles (see Patent Document 1).

In this known technique, a bag filled with a package is placed horizontally on a transport belt, and air is blown onto the open end of the bag from above to flatten the open end with respect to the transport belt. Open the mouth of the bag, insert two expansion bars into the opened bag, spread it sideways to widen the mouth of the bag sideways, and open the open end of the bag opened up and down. It is a "packaging method using a bag" that is sandwiched and sealed.
According to this packaging method, even if the plastic bag is extremely thin and has a weak waist, the opening is surely opened, and the opening end of the bag is surely stretched flat by the expansion bar inserted into the opening. It can be sealed without wrinkling.

In the case of a thin and weak plastic bag, the opening end of the bag can be reliably stretched flat by the expansion bar and sealed without wrinkles, but in the case of a self-supporting bag with flexible rigidity. As shown in the conventional operation explanatory diagram of FIG. 5, when the packaged product filled in the self-supporting bag is biased to the right or left, the opening end is displaced to the left and right by expanding the opening end with the expansion bar. It became flat (in the state shown by the solid line) and wrinkled on the left and right opening side edges, which caused the inconvenience of causing poor sealing wrinkles.
In the present invention, in order to prevent such poor seal wrinkles, the opening of the self-supporting bag having appropriate rigidity is widened by the expansion bar, and the left and right opening side edges are sandwiched between the upper and lower grippers and pulled sideways to flatten the bag. The opening is sandwiched between the top and bottom to seal.

Japanese Patent No. 39088897

In the present invention, the opening of the self-supporting bag having flexible rigidity is widened by the expansion bar, the left and right opening side edges are sandwiched between the upper and lower grippers and pulled sideways to flatten the bag, and the flat opening is sandwiched and sealed. An object of the present invention is to provide a bag mouth shaping and sealing device.

The bag mouth shaping and sealing device of the present invention is a carry-in supply device that transfers a self-supporting bag filled with a packaged product in a horizontal position by a belt conveyor, and a self-supporting bag opening is horizontally widened by an expansion bar at a sealing seal stop position. The expansion bar flattening device that is preliminarily flattened and the left and right side edges of the bag opening that is preliminarily flattened by the expansion bar are sandwiched between the upper and lower grippers and expanded to the left and right to complete the bag. It consists of a shaping device for flattening a bag and a sealing sealing device for sealing the opening of a completely flattened bag by sandwiching it with a seal bar.

The bag mouth shaping and sealing method of the present invention includes a carry-in and supply process in which a self-supporting bag filled with a package is transferred to a horizontal state by a one-sided inclined belt conveyor, and an expansion bar is inserted into the opening of the self-supporting bag at a sealing seal stop position. Then, the expansion bar flattening step of expanding the expansion bar laterally to make it preliminarily flat, and the left and right side edges of the bag opening preliminarily flattened by the expansion bar are gripped with upper and lower grippers. After sandwiching and escaping the expansion bar, the shaping process of expanding the upper and lower grippers to the left and right to make the bag completely flat, and the opening of the completely flattened bag are sandwiched vertically with the seal bar to seal. It consists of a sealing process.

In the bag mouth shaping and sealing device and method of the present invention, the opening of the self-standing bag that has been transferred in the horizontal state is preliminarily flattened by the expansion bar, and the opening is preliminarily flattened by the upper and lower grippers while maintaining this preliminary flattened state. After sandwiching the left and right side edges of the bag and expanding it to the left and right to make it completely flat, seal it with a seal bar, so the opening of the self-supporting bag is surely stretched to a flat state and sealed without wrinkles. Can be done.

It is a left side view of the bag mouth shaping and sealing device of this invention. It is a top view which partially omitted the bag mouth shaping and sealing apparatus of this invention. It is a front view of the bag mouth shaping and sealing device of this invention. It is operation explanatory drawing of the bag mouth shaping sealing apparatus of this invention. It is a conventional operation explanatory drawing.

An embodiment of the bag mouth shaping and sealing device of the present invention will be described below with reference to the accompanying drawings.
As shown in the left side view of FIG. 1, the bag mouth shaping and sealing device of the present invention includes a carry-in supply device 3 that transfers a self-supporting bag 1 filled with packages to a horizontal state by a belt conveyor 2, and a sealing seal stop position. The expansion bar flattening device 5 that expands the opening of the self-supporting bag 1 laterally with the expansion bar 4 to make it preliminarily flat, and the opening of the bag that is preliminarily flattened by the expansion bar 4. While sandwiching the left and right side edges of the bag with the upper and lower grippers 6, the shaping device 7 that expands to the left and right to make the bag completely flat, and the opening of the completely flattened bag are sandwiched vertically with the seal bar 8 to seal. It includes a sealing seal device 9.

The carry-in / supply device 3 is arranged horizontally with an inclination angle of about 5 ° to 7 ° so as to convey the one-side inclined belt conveyor 2 with the opening side of the self-supporting bag 1 high and the bottom side low. doing.
As shown in the partially omitted plan view of FIG. 2, in the self-supporting bag 1 transferred by the belt conveyor 2, four expansion bar flattening devices 5 are arranged so that four bags can be processed at the same time in this embodiment. However, it is not limited to this.
The expansion bar flattening device 5 is provided with left and right expansion bars 4 for preliminarily flattening the opening of the self-supporting bag 1, and the left expansion bar 10 and the right expansion bar 11 respectively. The left connecting rod 12 and the right connecting rod 13 are fixed to the left connecting rod 12 and the right connecting rod 13 so as to move horizontally in the left-right direction as a unit, and the left connecting rod 12 and the right connecting rod 13 are the left block body 14 and the right block body 15. It is fixed to.
Then, the expansion bar flattening device 5 connects the left lever 17 and the right lever 18 connected to the cylinder head 16 at an angle to the left block body 14 and the right block body 15, and advances and retreats the expansion cylinder 19. By the operation, the left lever 17 and the right lever 18 move along the guide rail 20, and the left expansion bar 10 and the right expansion bar 11 move left and right. As a result, the left and right expansion bars 4 can be expanded to the left and right.
The base 23 moves by the reciprocating operation of the moving cylinder 22 mounted on the gantry 21, and the expansion cylinder 19 and the guide rail 20 mounted on the base 23 move forward and backward to the opening of the self-supporting bag 1. The expansion lever flattening device 5 is moved forward and backward.

As shown in FIG. 1, the shaping device 7 is provided in a gap between the carry-in supply device 3 and the expansion bar flattening device 5, and as shown in the front view of FIG. 3, the entire shaping device 7 is provided by the upper and lower main cylinders 24. Is designed to move up and down toward the opening of the self-supporting bag 1.
The shaping device 7 arranges the upper gripper 25 and the lower gripper 26 facing each other at the vertical positions corresponding to the left and right side edges of the opening of the self-standing bag 1, respectively. The upper gripper 25 and the lower gripper 26 are paired so as to open to the left and right, and in this embodiment, two sets of two grippers 6 are provided.
The upper gripper 25 and the lower gripper 26 are fixed to the left moving rod 27 and the right moving rod 28 so as to move horizontally in the left-right direction, and the left lever 30 and the left lever 30 connected to the vertically moving cylinder head 29 at an angle. The right lever 31 is connected to the left moving rod 27 and the right moving rod 28, and the left moving rod 27 and the right moving rod 28 move along the guide rail 33 by the up / down movement of the vertical movement cylinder 32 to move the upper gripper 25. And the lower gripper 26 is designed to move left and right.

Next, the operation operation of the bag mouth shaping and sealing device of the present invention will be described below based on the attached drawings.
As shown in FIG. 1, when the self-supporting bag 1 filled with the package is transferred to the sealing seal stop position by the one-side inclined belt conveyor 2 and stopped, the expansion bar 4 in the closed state moves forward and the self-supporting bag 1 It is inserted into the opening of the conveyor and spreads in the left-right direction. At this time, the expansion bar 4 preliminarily expands the opening of the self-standing bag 1 to a flat state of about 90%.

As shown in the operation explanatory view of FIG. 4, after the upper gripper 25 and the lower gripper 26 are operated up and down in the above-mentioned preliminary flat state to sandwich the left and right side edges of the self-supporting bag 1 and the expansion bar 4 is pulled out. The upper gripper 25 and the lower gripper 26 sandwich the left and right side edges of the self-supporting bag 1 and horizontally move the self-supporting bag 1 in the left-right direction so that the opening of the self-supporting bag 1 is completely flattened by about 100%.
Then, the opening of the self-standing bag 1 which has been completely flattened is sandwiched between the seal bars 8 and sealed.

In this way, the opening of the self-standing bag 1 that has been transferred in the horizontal state is preliminarily flattened by the expansion bar 4, and the left and right side edges of the opening are preliminarily flattened by the upper and lower grippers 6 while maintaining this preparatory flat state. The opening of the self-standing bag 1 is surely stretched to a flat state and can be sealed without wrinkles because the seal bar 8 seals and seals the bag 1 after expanding it to the left and right while sandwiching it to make it completely flat.

1 Self-supporting bag 2 Belt conveyor 3 Carry-in supply device 4 Expansion bar 5 Expansion bar flattening device 6 Vertical gripper 7 Shaping device 8 Seal bar 9 Sealing seal device 10 Left expansion bar 11 Right expansion bar 12 Left connection rod 13 Right connection杆 14 Left block body 15 Right block body 16 Cylinder head 17 Left lever 18 Right lever 19 Expanding cylinder 20 Guide rail 21 Stand 22 Moving cylinder 23 Base 24 Main cylinder 25 Upper gripper 26 Lower gripper 27 Left moving 杆 28 Right moving 杆29 Vertical movement cylinder head 30 Left lever 31 Right lever 32 Vertical movement cylinder 33 Guide rail

Claims (2)

A carry-in supply device that transfers the self-supporting bag filled with the package to the horizontal position by a one-sided inclined belt conveyor, and the opening of the self-supporting bag is horizontally widened by the expansion bar at the sealing seal stop position to make it preliminarily flat. An expansion bar flattening device and a shaping device that expands left and right to make the bag completely flat while sandwiching the left and right side edges of the bag opening that has been preliminarily flattened by the expansion bar with upper and lower grippers. A bag mouth shaping and sealing device characterized by comprising a sealing and sealing device that seals a completely flattened bag opening by sandwiching it up and down with a sealing bar. The carry-in / supply process in which the self-supporting bag filled with the package is transferred to the horizontal position by a one-sided inclined belt conveyor, and the expansion bar is inserted into the opening of the self-supporting bag at the sealed seal stop position, and the expansion bar is spread horizontally. The expansion bar flattening step of preliminarily flattening the bag and the left and right side edges of the opening of the bag preliminarily flattened by the expansion bar are sandwiched between the upper and lower grippers to escape the expansion bar. After that, it is characterized by a shaping process of expanding the upper and lower grippers to the left and right to make the bag completely flat, and a sealing process of sandwiching the opening of the completely flat bag up and down with a seal bar to seal the bag. Bag mouth shaping and sealing method.

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