JP7281803B2 - Bag opening shaping and sealing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag opening shaping and sealing device that clamps the left and right side edges of the opening of a self-supporting bag having flexibility and rigidity to flatten the bag and seals the opening in the flattened state.

Conventionally, even if you try to seal the opening of a thin and weak plastic bag after filling it with a package product, it is extremely difficult to seal the opening cleanly without wrinkles because the bag is soft and weak. Met.
For this reason, there is known a "bag packaging method" that makes it possible to seal the open end of a thin plastic bag filled with packaged goods in a wrinkle-free state (see Patent Document 1).

In this known technique, a bag filled with packaged goods is placed horizontally on a conveyor belt, and air is blown from above to the open end of the bag to flatten the open end with respect to the conveyor belt. The mouth of the bag is opened, two expansion bars are inserted into the opened bag, the bars are spread horizontally to widen the mouth of the bag, and the open ends of the opened bag are moved up and down. It is a "packaging method using a bag" that sandwiches and seals.
According to this packaging method, the opening of even a very thin and weak plastic bag can be reliably opened, and the opening end of the bag can be reliably flattened 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 expansion bar ensures that the open end of the bag is flattened and sealed without wrinkles. In this case, as shown in FIG. 5, which is an explanatory view of the conventional operation, when the self-supporting bag is filled with products that are biased to the right or left, the opening end is widened with an expansion bar to the left and right. It became flattened (indicated by the solid line) and wrinkled at the left and right opening side edges, which caused the inconvenience of causing wrinkles due to poor sealing.
In order to prevent such wrinkles due to poor sealing, the present invention expands the opening of a self-supporting bag having moderate rigidity with an expansion bar, pinches the left and right opening side edges with upper and lower grippers, and pulls it sideways to flatten it. The opening is sandwiched between the top and bottom to seal.

Japanese Patent No. 3908897

According to the present invention, the opening of a self-supporting bag having flexible rigidity is widened by an expansion bar, and the side edges of the left and right openings are sandwiched between upper and lower grippers to flatten the bag, and the flattened opening is sandwiched vertically to seal. An object of the present invention is to provide a bag opening shaping and sealing device.

The bag opening shaping and sealing device of the present invention comprises a carrying-in supply device that transfers a self- supporting bag filled with articles to be packaged in a horizontal position by a one-side inclined belt conveyor, and an opening of the self-supporting bag that is expanded by an expansion bar at the sealing stop position. An expanding bar flattening device for horizontally expanding and preliminarily flattening the bag, and expanding the bag horizontally while holding the left and right side edges of the opening of the bag preliminarily flattened by the expanding bar with the upper and lower grippers. and a sealing device that seals the opening of the completely flattened bag by sandwiching it between upper and lower seal bars.

The method of shaping and sealing the bag opening of the present invention comprises a step of carrying in and supplying a self- supporting bag filled with items to be packaged in a laterally placed state on a one-side inclined belt conveyor, and moving an expansion bar to the opening of the self-supporting bag at a sealing stop position. an expansion bar flattening step in which the expansion bar is inserted and spread laterally to preliminarily flatten the bag; After the expansion bar is released, the upper and lower grippers are expanded to the left and right to form a completely flattened bag, and the opening of the completely flattened bag is sandwiched between the upper and lower seal bars. and a hermetic sealing step to seal with.

In the bag mouth shaping and sealing apparatus and method of the present invention, the opening of a self-supporting bag that has been transported in a horizontal position is preliminarily flattened by an expansion bar, and in this pre-flattened state, the opening is opened by upper and lower grippers. After holding the left and right side edges of the self-supporting bag and expanding it to the left and right to make it completely flat, the opening of the self-supporting bag is surely stretched flat and sealed without wrinkles because it is sealed with a seal bar. can be done.

Fig. 2 is a left side view of the bag mouth shaping and sealing device of the present invention; 1 is a partially omitted plan view of a bag mouth shaping and sealing device of the present invention; FIG. 1 is a front view of a bag mouth shaping and sealing device of the present invention; FIG. FIG. 4 is an operation explanatory view of the bag mouth shaping and sealing device of the present invention; FIG. 10 is an explanatory diagram of a conventional operation;

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 comprises a carry-in supply device 3 for transporting a self- supporting bag 1 filled with items to be packaged in a horizontal position on a one-sided inclined belt conveyor 2, and a sealing device. An expansion bar flattening device 5 for horizontally widening the opening of the self-supporting bag 1 at the sealing stop position by the expansion bar 4 to preliminarily flatten the bag, and the bag preliminarily flattened by the expansion bar 4. While holding the left and right side edges of the opening of the bag with the upper and lower grippers 6, the shaping device 7 expands left and right to make it completely flat, and the completely flat opening of the bag is held vertically by the seal bar 8. and a hermetic sealing device 9 for sealing with.

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

The shaping device 7 is provided in a gap between the carry-in supply device 3 and the spreading bar flattening device 5 as shown in FIG. 1. As shown in the front view of FIG. moves up and down toward the opening of the self-supporting bag 1.
The shaping device 7 arranges an upper gripper 25 and a lower gripper 26 facing each other at upper and lower positions corresponding to the left and right side edges of the opening of the self-supporting bag 1 . Each of the upper gripper 25 and the lower gripper 26 is paired so as to open to the left and right, and in this embodiment, a total of four sets of grippers 6, two sets of two sets, are provided.
The upper gripper 25 and the lower gripper 26 are fixed to a left moving rod 27 and a right moving rod 28 so as to horizontally move in the horizontal direction, and are connected to a vertical 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 are moved along the guide rail 33 by the forward and backward movement of the vertical movement cylinder 32 to move the upper gripper 25. And the lower gripper 26 is moved left and right.

Next, the operation 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 FIG. 1, the self -supporting bag 1 filled with the items to be packaged is transported by the one-sided inclined belt conveyor 2 to the hermetic sealing stop position and stopped, and then the expansion bar 4 in the closed state advances to open the self-supporting bag. It is inserted into the opening of 1 and expanded in the left-right direction. At this time, the expansion bar 4 preliminarily expands the opening of the self-supporting bag 1 to a flat state of about 90%.

As shown in the operation explanatory diagram of FIG. 4, the upper gripper 25 and the lower gripper 26 are moved up and down in the preliminary flattened state to grip the left and right side edges of the self-supporting bag 1, and after the expansion bar 4 is pulled out. , the upper gripper 25 and the lower gripper 26 hold the left and right side edges of the self-supporting bag 1 and move it horizontally to make the opening of the self-supporting bag 1 completely flat about 100%.
Then, the opening of the self-supporting bag 1 completely flattened is sandwiched between upper and lower sealing bars 8 to seal.

In this way, the opening of the self-supporting bag 1, which has been transported horizontally, is preliminarily flattened by the expanding bar 4, and in this preliminarily flattened state, the left and right side edges of the opening are gripped by the upper and lower grippers 6. Since the self-supporting bag 1 is completely flattened by spreading it to the left and right while being sandwiched, and then hermetically sealed by the seal bar 8, the opening of the self-supporting bag 1 can be reliably stretched in a flattened state and sealed without wrinkles.

1 self-supporting bag 2 belt conveyor 3 carry-in supply device 4 expansion bar 5 expansion bar flattening device 6 upper and lower gripper 7 shaping device 8 seal bar 9 sealing device 10 left expansion bar 11 right expansion bar 12 left connecting rod 13 right connection Rod 14 Left block body 15 Right block body 16 Cylinder head 17 Left lever 18 Right lever 19 Expanding cylinder 20 Guide rail 21 Base 22 Moving cylinder 23 Base 24 Main cylinder 25 Upper gripper 26 Lower gripper 27 Left moving rod 28 Right moving rod 29 vertical movement cylinder head 30 left lever 31 right lever 32 vertical movement cylinder 33 guide rail

Claims (1)

A self- supporting bag filled with items to be packaged is placed horizontally on a one-side inclined belt conveyor that is set horizontally with an inclination of 5° to 7° so that the opening side is high and the bottom side is low. At the sealing stop position, the opening of the self-supporting bag is moved forward and backward by the reciprocating motion of the expansion cylinder and the guide rail mounted on the base, and the cylinder of the expansion cylinder is moved. The left lever and the right lever, which are connected to the head at an angle, are connected to the left block body and the right block body. an expansion bar flattening device in which the opening bar and the right expansion bar are horizontally moved to laterally spread and preliminarily flattened by the expansion bar; The left and right side edges of the opening of the bag are vertically moved by the reciprocating motion of the main cylinder, and the vertical movement cylinder and the guide rail are moved up and down, and the left and right levers connected at an angle to the vertical movement cylinder head of the vertical movement cylinder are operated. The left and right movement rods are connected to the left movement rod and the right movement rod, and the left movement rod and the right movement rod are moved along the guide rail by the forward and backward movement of the vertical movement cylinder to horizontally move the upper gripper and the lower gripper. It is characterized by being composed of a shaping device that expands left and right while holding it with a gripper to make it completely flattened, and a sealing device that seals the opening of the completely flattened bag by holding it up and down with a seal bar. A device for shaping and sealing the bag mouth.

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