JP2021014269A - Self-supporting bag forming seal apparatus - Google Patents

Abstract

To provide a bag presser apparatus to correct a posture of a self-supporting bag before sealing and calibrate an opening portion to a correct opening portion center position in a self-supporting bag forming seal apparatus in which the opening portion of the self-supporting bag having a flexible rigidity is expanded by an expansion bar and a horizontal opening side edge is held between an upper and lower gripper and pulled sideways to make it flat, and the opening portion in a flat state is held vertically to be sealed.SOLUTION: Regarding a self-supporting bag 1 transported to a tight seal position by a belt conveyor 2 in a horizontal placed state, a posture of the self-supporting bag 1 is corrected at the tight seal position before sealing even if a packaged product is unevenly filled. The posture is corrected by a bag presser apparatus that calibrates an opening portion to a correct opening portion center position, and the opening portion of the self-supporting bag 1 is preliminarily flattened by a horizontal expansion bar 4. In the preliminarily flat state, a horizontal side edge of the opening portion is held by an upper and lower gripper 6 and expanded horizontally to make it completely flat, and is tightly sealed by a seal bar (not illustrated).SELECTED DRAWING: Figure 1

Description

The present invention is a self-supporting bag shaping sealing device that seals the opening in a flat state by pulling laterally across the left and right side edges of the self-supporting bag opening having flexible rigidity to flatten the opening. It relates to a bag holding device that corrects the opening and corrects the opening to the correct opening center position.

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, 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 into a flat state by the expansion bar inserted into the opening and wrinkles are formed. Can be sealed without causing.

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 bag shaping operation explanatory view of FIG. 8, when the packaged product filled in the self-supporting bag is biased to the right or left, the opening end is shifted to the left and right by expanding the opening end with the expansion bar. In this state, it became flat (shown by a solid line) and wrinkled on the left and right opening side edges, which caused the inconvenience of causing poor sealing wrinkles.
In order to prevent such poor seal wrinkles, the applicant applies a flattening bag by widening the opening of the self-supporting bag having appropriate rigidity with an expansion bar, sandwiching the left and right opening side edges with upper and lower grippers, and pulling it sideways to flatten it. We have developed a bag mouth shaping and sealing device (see Japanese Patent Application No. 2019-092850) that seals by sandwiching the opening of the state up and down.

However, as shown in the explanatory view of FIG. 4, when the self-supporting bag is unevenly filled with the contents, wrinkles are formed on the uneven side even if the bag is expanded with the expansion bar, and the bag is sandwiched between the upper and lower grippers in that state. As a result, the seal is performed with the wrinkles formed, and defective products are generated.
In order to prevent this, the bag mouth shaping and sealing device (see Japanese Patent Application No. 2019-92850) is provided with a bag holding device that corrects the posture of the self-standing bag before sealing and corrects the opening to the correct opening center position. Is added.

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. It is an object of the self-supporting bag shaping sealing device to be provided with a bag holding device that corrects the posture of the self-standing bag before sealing and corrects the opening to the correct opening center position.

The self-supporting bag shaping seal device of the present invention is a carry-in supply device that transfers a self-supporting bag filled with a packaged product to a horizontal position by a belt conveyor, and a self-supporting bag opening is horizontally widened by an expansion bar at a sealed seal position. The expansion bar 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 be completely flattened. A shaping device that seals the bag by sandwiching the opening of the completely flattened bag up and down with a seal bar, and a self-standing bag that corrects the posture of the self-supporting bag before sealing at the sealing seal position to open the opening. It is equipped with a bag holding device that corrects the center position of the opening.

The self-supporting bag shaping seal device of the present invention corrects the posture of the self-supporting bag before sealing the self-supporting bag that has been transferred in the horizontal position at the sealing seal position, corrects the opening to the correct opening center position, and corrects the self-standing bag to the correct opening center position. The opening of the opening is preliminarily flattened by the expansion bar, and in this preparatory flat state, the left and right side edges of the opening are sandwiched by the upper and lower grippers and expanded to the left and right to be completely flattened, and then the seal bar is completely flattened. Since the self-standing bag is sealed with a seal, the opening of the self-standing bag can be reliably stretched to a flat state and sealed without wrinkles.

It is a top view of the self-supporting bag shaping seal device of this invention. It is a front view of the shaping apparatus of the self-supporting bag shaping sealing apparatus of this invention. 1A-A arrow view of the self-supporting bag shaping seal device of the present invention. It is explanatory drawing of the bag posture correction operation of this invention. It is explanatory drawing of the holding rod of the bag holding device of this invention. It is explanatory drawing of the holding umbrella of the bag holding device of this invention. It is explanatory drawing of the upper and lower grippers of the shaping apparatus of this invention. It is explanatory drawing of the conventional bag shaping operation.

An embodiment of the self-supporting bag shaping seal device of the present invention will be described below with reference to the accompanying drawings.
As shown in the plan view of FIG. 1, the self-supporting bag shaping seal device of the present invention is self-supporting at the sealing seal position with the carry-in supply device 3 that transfers the self-supporting bag 1 filled with the packaged product to the horizontal state by the belt conveyor 2. The expansion bar device 5 that expands the opening of the bag 1 laterally with the expansion bar 4 to make it preliminarily flat, and the left and right sides of the opening of the bag that is preliminarily flattened by the expansion bar 4. The shaping device 7 (see the front view of FIG. 2) that expands to the left and right to make the bag completely flat while sandwiching the edge with the upper and lower grippers 6, and the opening of the bag that is completely flattened up and down with a seal bar. It is composed of a sealed sealing device (not shown) that sandwiches and seals the bag, and a bag holding device 10 that corrects the posture of the self-standing bag 1 before sealing at the sealed sealing position and corrects the opening to the correct opening center position.

The carry-in / supply device 3 is arranged with an inclination angle of about 5 ° to 7 ° so as to convey the belt conveyor 2 installed in a horizontal state with the opening side of the self-standing bag 1 high and the bottom side low. doing.
As shown in FIG. 1, in the present embodiment, the self-supporting bag 1 transferred by the belt conveyor 2 with the opening on the front side and the bottom on the back side is provided with the expansion bar device 5 so that four bags can be processed at the same time. Four units are arranged, but the present invention is not limited to this.
The expansion bar 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 14 and the right expansion bar 15 are provided. The four pieces are fixed to the left connecting rod 16 and the right connecting rod 17 so as to move horizontally in the left-right direction, and the left connecting rod 16 and the right connecting rod 17 are further attached to the left block body 18 and the right block body 19. It is fixed.

Then, the expansion bar device 5 connects the left lever 21 and the right lever 22 which are connected to the cylinder head 20 at an angle to the left block body 18 and the right block body 19, and moves the expansion cylinder 23 forward and backward. As a result, the left lever 21 and the right lever 22 move along the guide rail 24, and the left expansion bar 14 and the right expansion bar 15 move left and right. As a result, the left and right expansion bars 4 can be expanded to the left and right.
The base moves due to the reciprocating operation of the moving cylinder mounted on the base (not shown), and the expansion cylinder 23 and the guide rail 24 mounted on the base move forward and backward to expand toward the opening of the self-supporting bag 1. The open lever device 5 is moved forward and backward.

The shaping device 7 is provided between the carry-in supply device 3 shown in FIG. 1 and the expansion bar device 5, and as shown in the front view of FIG. 2, the entire shaping device 7 is a self-supporting bag by the upper and lower elevating cylinders 25. It is designed to move up and down toward the opening of 1. In this embodiment, one elevating cylinder 25 is arranged at the upper side and two at the lower side.
The shaping device 7 arranges the upper gripper 26 and the lower gripper 27 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 26 and the lower gripper 27 are paired so as to open to the left and right, and a total of four sets of grippers 6 are provided.
The upper gripper 26 and the lower gripper 27 are fixed to the left moving rod 28 and the right moving rod 29 so as to move horizontally in the left-right direction, and are connected to the vertically moving cylinder head 30 at an angle. It is connected to 28 and the right moving rod 29, and the left moving rod 28 and the right moving rod 29 move by the up / down movement of the vertical movement cylinder 31, and the upper gripper 26 and the lower gripper 27 move left and right. The number 37 is a guide guide rail.

At the sealing seal position shown in FIG. 1, a bag holding device 10 is provided facing the expansion bar device 5 to correct the posture of the self-standing bag before sealing and to correct the opening to the correct opening center position.
The bag pressing device 10 is filled with a pressing rod 11 that presses the bottom left and right edges of the filled self-supporting bag 1 from above as shown in the arrow view AA of FIG. 3, and as shown in FIG. It is composed of a push plate 12 that pushes the bottom surface of the bottom of the self-supporting bag 1 in the lateral direction (in the direction of the expansion bar device 5), and a holding umbrella 13 that presses the upper surface of the filled self-supporting bag 1 from above as shown in FIG. ..
The holding rods 11 are arranged on the left and right sides of the width of the self-supporting bag 1 by a cylindrical body or another rod-shaped body, and press the left and right edges on the bottom side of the self-supporting bag 1 from above. In this embodiment, the self-supporting bag 2 The pieces are fixed to the connecting frame 32 so that the pieces can be pressed at the same time, and the connecting frame 32 is configured to move up and down by the elevating cylinder 33.
As shown in FIG. 1, the push plate 12 is fixed to the connecting bar 34 with a rectangular plate and moves at the same time as the pressing rod 11 or before or after the pressing rod 1 to move the bottom bottom surface of the self-standing bag 1. It is configured to be pushed by the cylinder 38 in the lateral direction (5 directions of the expansion bar device).
The holding umbrella 13 is made of a rectangular plate that is curved upwardly, is fixed to a fixed frame 36 that is raised and lowered by an elevating cylinder 35, and is configured to press the upper surface of the self-standing bag 1 from above.

Next, the operation operation of the self-supporting bag shaping seal 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 sealed seal position by the tilted belt conveyor 2 and stopped, one of the self-supporting bags 1 is shown in the explanatory view of FIG. When the packaged product is unevenly filled (the state shown by the solid line in FIG. 1), the lowering of the holding rod 11 presses the uneven side of the bottom side left and right edges of the self-standing bag 1 from above (in FIG. 4, the right side is pressed. The opening of the self-standing bag 1 that was slightly closed on the diagonal side from the side pressed by the pressing rod 11 was completely opened, and the central portion was convex as shown in the explanatory view of FIG. It is corrected to the open state. If the bag is not unevenly filled (shown by a chain line in FIG. 1), the holding rod 11 is adjusted so that the self-supporting bag 1 does not touch the holding rod 11. In this state, the central portion of the opening is convex. It has a shaped opening.
Around this time, the push plate 12 pushes the bottom surface of the self-standing bag 1 in the lateral direction (direction of the expansion bar device 5) to correct the posture, and as shown in the explanatory view of FIG. 6, from above. The holding umbrella 13 holds the upper surface of the self-standing bag 1 and temporarily holds it.

In this state, the expansion bar 4 in the closed state advances and is inserted into the opening of the self-supporting bag 1, and as shown in FIG. 6, the left expansion bar 14 and the right expansion bar 15 of the expansion bar 4 are inserted. It can be expanded in the left-right direction. At this time, the left expansion bar 14 and the right expansion bar 15 of the expansion bar 4 preliminarily expand the opening of the self-standing bag 1 to a flat state of about 90%.

As shown in the explanatory view of FIG. 7, the upper gripper 26 and the lower gripper 27 are operated up and down in a preliminary flat state to sandwich the left and right side edges of the self-supporting bag 1, and after the expansion bar 4 is pulled out, the upper gripper is used. With the left and right side edges of the self-supporting bag 1 sandwiched between the 26 and the lower gripper 27, the self-supporting bag 1 is horizontally moved 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-supporting bag 1 that has been completely flattened is sandwiched vertically with a seal bar (not shown) to seal the bag 1.

In this way, the self-supporting bag 1 that has been transferred in the horizontal position corrects the posture of the self-supporting bag 1 before sealing at the sealing seal position even if the packaged product is unevenly filled, and the opening is centered on the correct opening. The posture is corrected by the bag pressing device 10 that corrects the position, the opening of the self-supporting bag 1 is preliminarily flattened by the expansion bar 4, and the left and right sides of the opening are preliminarily flattened by the upper and lower grippers 6 while maintaining this preparatory flat state. After expanding to the left and right while sandwiching the edge to make it completely flat, the opening of the self-supporting bag 1 is surely extended to the flat state and sealed without wrinkles because it is sealed with a seal bar (not shown). can do.

1 Self-supporting bag 2 Belt conveyor 3 Carry-in supply device 4 Expansion bar 5 Expansion bar device 6 Vertical gripper 7 Shaping device 10 Bag holding device 11 Holding rod 12 Push plate 13 Holding umbrella 14 Left expansion bar 15 Right expansion bar 16 Left Connecting rod 17 Right connecting rod 18 Left block body 19 Right block body 20 Cylinder head 21 Left lever 22 Right lever 23 Expansion cylinder 24 Guide rail 25 Lifting cylinder 26 Upper gripper 27 Lower gripper 28 Left moving rod 29 Right moving rod 30 Vertical movement Cylinder head 31 Vertical movement cylinder 32 Connecting frame 33 Elevating cylinder 34 Connecting bar 35 Elevating cylinder 36 Fixed frame 37 Guide guard rail 38 Cylinder

Claims (2)

A carry-in supply device that transfers a self-supporting bag filled with packages to a horizontal position on a belt conveyor, and an expansion bar that expands the opening of the self-supporting bag sideways with an expansion bar at the sealed seal position to make it preliminarily flat. The device and the shaping device that expands to the left and right to make the bag completely flat while sandwiching the left and right side edges of the bag opening that was preliminarily flattened by the expansion bar with the upper and lower grippers, and the completely flat state. A sealing device that seals the opening of the bag by sandwiching it with a seal bar, and a bag retainer that corrects the posture of the self-standing bag before sealing at the sealing sealing position and corrects the opening to the correct opening center position. A self-supporting bag shaping seal device characterized by being equipped with a device. The bag holding device consists of a holding rod that presses the left and right side edges of the bottom of the self-supporting bag from above, a push plate that pushes the bottom position of the self-supporting bag from the side to correct the posture, and a holding umbrella that presses the upper surface of the self-supporting bag from above. The self-supporting bag shaping seal device according to claim 1, wherein the bag is shaped and sealed.

Images