JP6770341B2 - Sealing device for paper bag opening - Google Patents

Description

The present invention relates to a paper bag opening sealing device that seals a paper bag opening.

Conventionally, a paper bag with folds (hereinafter referred to as "paper bag") is attached to the exterior (integrated wrapping) in which a plurality of small bags (individual wrapping) filled with products such as powders and granules are collectively packaged. Is used.

This type of paper bag is described in publicly known documents such as Patent Document 1 below.

In this type of paper bag, usually, the opening of the bag is opened, and a plurality of individual packages to be packaged are put side by side through the opening of the paper bag, loaded into the inside of the paper bag, and then internally packaged. A flap that protrudes toward the opening from the body, and the flap on the side surface with both folds, the flap on one body surface, and the flap on the other body surface are sequentially bent to seal the opening.

In order to seal the opening of the paper bag, the contact surface side of the opening of the paper bag to be sealed in advance, that is, the flap of the side surface with both folds, the flap of one body surface, and the flap of the other body surface Is coated with a pressure-sensitive adhesive.
In this type of sealing work, the following two methods are adopted as the sealing method.
1) A method in which an operator manually performs a series of operations from opening the opening of a paper bag to putting in a plurality of individual packages side by side and bending the openings into close contact with each other. 2) Pre-assembled. A method in which a series of operations until a plurality of individual packages are put into an opening of a paper bag and the openings are bent and brought into close contact with each other are automatically performed by a sealing device.

Further, Patent Document 2 below describes an invention in which the left and right ends of the first bent piece to be bent first in the bag opening are grasped by a clamp mechanism immediately before bending to make the bending position constant. Has been done.

Japanese Patent No. 4248644 JP-A-2009-23691

When the method 1) above, in which the conventional sealing work is manually performed, is adopted, there is a problem that the work efficiency is poor. In addition, since it is a manual operation, if you are not an expert, you may experience poor sealing, such as wrinkles during sealing or adhesion that deviates from the specified position, and it is easily affected by the skill level of the operator, and the accuracy of sealing is stable. There is a problem of not doing it.

When the conventional method 2), which automatically performs the sealing operation, is adopted, there is a problem that the equipment introduction cost becomes high. Further, even with a conventional sealing device, there is a problem that the sealing accuracy is not stable. That is, in the opening of the paper bag, the flaps on the side surfaces with both folds are first folded into a triangle, and then the flap on the one body surface to which the pressure-sensitive adhesive is applied is bent and overlaps the adhesive-coated surface. As described above, the flap of the other body surface to which the same adhesive is applied is bent and sealed by the adhesive force of the adhesive.

At this time, in the prior art (Patent Document 2), the accuracy may not be stable due to the inability to bend at an accurate position or wrinkles at the time of bending. If wrinkles occur during sealing, or if the paper bag is glued out of the specified position, it may look bad, the adhesive surface may peel off due to insufficient adhesive area, or the strength of the paper bag may decrease due to the adhesive surface peeling off. Occurs.

The present invention has been made in view of such circumstances, and can improve work efficiency and workability as compared with the case of adopting the method 1) above in which the sealing work is manually performed, and the sealing work can be performed. Compared to the case of adopting the method of 2) above, which is performed automatically, the problem is to make the equipment installation cost cheaper and to enable high quality sealing without deterioration of sealing accuracy. is there.

The first invention is

A flap that protrudes toward the opening side of the packaged body after the packaged body is loaded into the inside of the paper bag through the opening of the paper bag, and is a flap on the side surface portion with both folds and one body surface portion. In a paper bag opening sealing device that seals the opening by sequentially bending the flap and the flap of the other body surface portion.
A holding plate that bends the flaps of the side surfaces with both folds and presses the flaps of the side surfaces with both folds on the upper surface of the packaged body.

A first roller that bends the flap of one of the body surfaces and presses the flap of the one body surface onto the bent flap of the side surface having both folds.
A second roller that bends the flap of the other body surface portion and presses the flap of the other body surface portion onto the bent flap of the one body surface portion.

The other body surface portion is inserted into the mouth of the other body surface portion formed when the flap of the other body surface portion is bent, and the mouth of the other body surface portion is opened to the outside of the side surface of the paper bag. Equipped with an opening device that adjusts the bending shape of the flap on the body surface

With the opening device inserted into the mouth of the other body surface portion, the second roller is operated to put the flap of the one body surface portion bent onto the flap of the other body surface portion. It is characterized by pressing the flap.
The second invention is the first invention.
The opening device is characterized in that it is configured to include two arms.

Compared to the method 2) above, which automatically performs a series of sealing operations from individual packaging to sealing, the flaps on the side surface with both folds, the flap on one body surface, and the flap on the other body surface. Since it is a sealing device specialized in automating the work of sequentially bending (folding) and, the equipment introduction cost can be suppressed at low cost.
Further, since the device automatically bends and seals each flap, workability and work efficiency can be improved as compared with the method 1) above in which a series of sealing operations are manually performed.

The present inventor has analyzed the cause of not breaking at an accurate position in a conventional sealing device. The flaps on the side surface with both folds that are bent earlier and the flaps on one body surface pull the flaps on the other body surface that are bent later, and the left and right sides of the flaps on the other body surface are curved. .. If the flap of the other body surface is bent while being curved, the flap of the other body surface may be adhered or wrinkles may occur in the curved state.

According to the present invention, the opening device is inserted into the mouth of the other body surface portion so that the bent shape of the flap of the other body surface portion is adjusted. That is, by forcibly opening both the left and right sides where the flap of the other body surface portion is curved, the mouth of the other body surface portion is stretched, and the bent shape of the flap of the other body surface portion is adjusted.

With the folded shape of the flap of the other body surface that is bent later adjusted in this way, the flap of the other body surface is pressed onto the flap of one body that was bent earlier to open the opening. Since the part is sealed, it is possible to seal with high quality without wrinkles or deterioration of the sealing accuracy such as adhesion deviating from the specified position at the time of sealing.

FIG. 1 is a plan view of a paper bag used in the examples. FIG. 2 is a perspective view illustrating a procedure for sealing an opening of a paper bag. FIG. 3 is a perspective view illustrating a procedure for sealing the opening of the paper bag. FIG. 4 is a view of the sealing device of the embodiment as viewed from the left side. FIG. 5A is a diagram illustrating the operation of the sealing device. FIG. 5B is a diagram illustrating the operation of the sealing device. FIG. 6A is a diagram illustrating the operation of the sealing device. FIG. 6B is a diagram illustrating the operation of the sealing device. FIG. 7A is a diagram illustrating the operation of the sealing device. FIG. 7B is a diagram illustrating the operation of the sealing device. FIG. 8A is a diagram illustrating the operation of the sealing device. FIG. 8B is a diagram illustrating the operation of the sealing device. FIG. 9A is a diagram illustrating the operation of the sealing device. FIG. 9B is a diagram illustrating the operation of the sealing device. FIG. 10A is a diagram illustrating the operation of the sealing device. FIG. 10B is a diagram illustrating the operation of the sealing device. FIG. 11A is a diagram illustrating the operation of the sealing device. FIG. 11B is a diagram illustrating the operation of the sealing device.

Hereinafter, embodiments of the paper bag opening sealing device according to the present invention will be described with reference to the drawings.
(Paper bag structure)
FIG. 1 is a plan view of the paper bag 10 used in the embodiment.
The paper bag 10 includes a bag main body 18 in which one opening on the lower side in the drawing of a tubular body with folds is sealed and the other opening 10a on the upper side in the drawing is opened.

The open opening 10a of the bag body 18 is accommodated and loaded by inserting a plurality of (for example, 5) individual packages 20 to be packaged into the bag body 18 from the opening 10a. When it is done, it will be sealed. In the figure, the broken line is a virtual line indicating the upper end 20a of the loading position of the individual package 20.

The bag body 18 is connected to one body surface portion 13 located on the front surface side in the drawing, the other body surface portion 15 located on the back surface side in the drawing, and one body surface portion 13 (front surface) and the other body surface portion 15. It is composed of both left and right pleated side surface portions 11L and 11R (collectively indicated by reference numeral 11).
The opening 10a is formed in a staircase cut, and the upper end of one body surface portion 13 is lower than the upper end of the other body surface portion 15.
The portion above the individual package 20 loaded inside the bag body 18 and protruding toward the opening 10a is referred to as a flap.

The left and right pleated side surface portions 11L and 11R have left and right flaps 12L and 12R (collectively indicated by reference numeral 12), one body surface portion 13 has flaps 14, and the other body surface portion 15 has flaps 14. , Has a flap 16.
A pressure-sensitive adhesive is applied to the parts (indicated by diagonal lines) of the flaps 12, 14 and 16 that should be attached to each other in close contact with each other at the time of sealing.
(Paper bag sealing procedure)
2 and 3 are perspective views illustrating a procedure for sealing the opening 10a of the paper bag 10.

FIG. 2 is an enlarged view showing a main part in the vicinity of the opening 10a of the paper bag 10 before being bent, and FIG. 3 shows a flap 12 of a side surface portion 11 with both folds and a flap 14 of one body surface portion 13. Indicates a folded state. In FIGS. 2 and 3, the right side of the same configuration is omitted and the left side is shown.

First, the flaps 12L and 12R of the left and right pleated side surfaces 11L and 11R are bent inward of the opening 10a as shown by the arrow A (only the left side is shown in the drawing). In the figure, it is folded along the triangular bending line indicated by the alternate long and short dash line. Therefore, as will be described later, the triangular holding plate 120 is used when bending the flap 12 of the side surface portion 11 having both folds.

Next, the flap 14 of one of the body surface portions 13 is bent inward of the opening 10a as shown by an arrow B. As will be described later, the first roller 130 is used when bending the flap 14 of one of the body surface portions 13.

Finally, the flap 16 of the other body surface portion 15 is bent inward of the opening 10a as shown by the arrow C. As will be described later, the second roller 140 is used when bending the flap 16 of the other body surface portion 15. When the flap 16 of the other body surface portion 15 is bent, the mouth 15a is formed in the other body surface portion 15. If the fold of the mouth 15a is bent, there is a possibility that wrinkles may occur at the time of sealing, or problems such as deviation from the specified position and adhesion may occur. Therefore, as will be described later, the opening device 150 is used to open the mouth 15a of the other body surface portion 15 to the outside of the side surface of the paper bag 10 and to arrange the bent shape of the flap 16 of the other body surface portion 15.
(Structure of sealing device for paper bag opening)

FIG. 4 is a view of the sealing device 300 of the embodiment as viewed from the left side surface, and is largely composed of an automatic sealing unit 100 and a packing assisting unit 200. In FIG. 4, the direction of arrow D in the drawing is the front, the direction toward the front surface of the drawing is the left direction, and the direction toward the back surface of the drawing is the right direction.

The automatic sealing portion 100 includes a frame 190, a bag frame 110, a holding plate 120, a first roller 130, a second roller 140, an opening device 150, and a product discharge conveyor 160. There is.
The packing assisting portion 200 includes a pedestal 290, a rail 280, and a hopper 210.

The bag frame 110 is rotatably supported by the frame 190. The bag frame 110 has an opening 111 (see FIG. 5B), and is a housing that serves as an outer frame of the paper bag 10 when the individual wrapping 20 is packed with the empty paper bag 10 set. The bag frame 110 accommodates a portion of the paper bag 10 loaded with at least the individual wrapping 20, and the flap 12 of the side surface portion 11 with both folds, the flap 14 of one body surface portion 13, and the flap 16 of the other body surface portion 15 It is formed so as to protrude from the opening 111.
The bag frame 110 is driven and controlled by a control sequencer and actuator (not shown).

The holding plate 120 (showing the holding plate 120L on the left side in the drawing) is formed in a triangular shape in order to bend the flap 12 of the side surface portion 11 having both folds into a triangular shape as described with reference to FIGS. 2 and 3. It is a board member. The pressing plate 120 is composed of left and right pressing plates 120L and 120R, and is rotatable so as to press the left and right side surface portions 11L and 11R of the paper bag 10 at a position where the opening 111 of the bag frame 110 faces the top surface in the upward direction in the drawing. It is supported by the frame 190. The holding plate 120 is driven and controlled by a control sequencer and an actuator (not shown). The holding plates 120L and 120R are formed by bending the left and right flaps 12L and 12R of the left and right pleated side surfaces 11L and 11R, respectively, and bending the left and right pleated side surfaces 11L and 11R on the upper surface of the individual package 20 which is the packaged body. It operates to hold down the left and right flaps 12L and 12R (see FIG. 7A).

The first roller 130 is rotatably supported by the frame 190 so as to roll and move along the upper surface of the individual wrapping 20 loaded in the paper bag 10 in the bag frame 110. The first roller 130 is driven and controlled by a control sequencer and an actuator (not shown). The first roller 130 operates so as to bend the flap 14 of one body surface portion 13 and press the flap 14 of one body surface portion 13 onto the flap 12 of the folded side surface portion 11 with both folds ( See FIG. 7 (b)).

The second roller 140 is rotatably supported by the frame 190 so as to roll and move along the upper surface of the individual wrapping 20 loaded in the paper bag 10 in the bag frame 110. The second roller 140 is driven and controlled by a control sequencer and actuator (not shown). The second roller 140 operates so as to bend the flap 16 of the other body surface portion 15 and press the flap 16 of the other body surface portion 15 onto the flap 14 of the one body surface portion 13 that has been bent (FIG. FIG. 8 (a)).

The opening device 150 includes two arms 150L and 150R. The opening device 150 is driven and controlled by a control sequencer and an actuator (not shown). As described with reference to FIG. 3, the opening device 150 inserts two arms 150L and 150R into the mouth 15a of the other body surface portion 15 formed when the flap 16 of the other body surface portion 15 is bent. The mouth 15a of the other body surface portion 15 is supported by the frame 190 so that it can be opened to the left and right outside the side surface of the paper bag (see FIGS. 9A and 9B). ).

The product discharge conveyor 160 is configured as a free roller conveyor including a slope 161 attached to the frame 190 so as to incline from above to downward, and a free roller 162 provided along the slope 161. In the product discharge conveyor 160, when the opening 111 of the bag frame 110 is located on the product discharge conveyor 160 side and the paper bag 10 loaded with the individual packaging 20 drops due to its own weight, the paper bag 10 loaded with the individual packaging 20 is loaded. It is installed in a position where it can be received (see FIG. 11 (a)).

A start button (not shown) is attached to the automatic sealing unit 100. This start button is an operation button for activating the operation of the control sequencer and each actuator (not shown), and activates the operation of the control sequencer and each actuator when operated by an operator. When the control sequencer is activated, each actuator is driven and controlled, and the bag frame 110, the holding plate 120, the first roller 130, the second roller 140, and the opening device 150 are sequentially operated in a predetermined procedure.
On the other hand, the stuffing auxiliary unit 200 is provided so that the worker can efficiently stuff the individual wrapping 20 in conjunction with the bag frame 110.

Rails 280 are provided on the gantry 290 along the left-right direction in the drawing. On the rail 280, a hopper 210 is slidably arranged along the rail 280.

The hopper 210 has a bottom plate 211 and left and right side plates 212L and 212R for setting a plurality of individual packages 20 to be packed in the paper bag 10 side by side, and has an upper top surface side in the drawing and a left bag in the drawing. The frame 110 side is open so that the operator can arrange the individual wrappings 20 in the hopper 210 and pack them in the paper bag 10 in the bag frame 110. The width between the left and right side plates 212L and 212R is adjusted so that the left and right side plates 212L and 212R can be inserted into the opening 10a of the paper bag 10 set in the bag frame 110.
(Operation of the sealing device for the opening of the paper bag)
Hereinafter, the operation of the sealing device 300 will be described with reference to FIGS. 5 to 11.
1) The operator arranges a plurality of (for example, 5) individual packages 20 in the hopper 210 according to the width between the left and right side plates 212L and 212R (FIG. 5A).

2) The bag frame 110 is set at an initial position where the opening 111 faces the hopper 210 side. An empty paper bag 10 is set in the bag frame 110 by an operator (FIG. 5 (b)).

3) The arranged individual wrappings 20 are inserted together with the hopper 210 by sliding them into the empty paper bag 10 along the rail 280 in the direction indicated by the arrow E (FIGS. 5 (b) and 6 (a)). After confirming that the plurality of individual wrappings 20 are loaded side by side in the paper bag 10, the original positions of only the hopper 210 are indicated by the arrow F on the opposite side by pressing the plurality of individual wrappings 20 by hand. Slide along rail 280 to remove (FIG. 6 (a)).
4) The automatic sealing is started by operating the start button (not shown) of the automatic sealing unit 100.
5) The bag frame 110 rotates from the initial position to the position where the opening 111 of the bag frame 110 faces the upper top surface in the drawing as indicated by an arrow G (FIG. 6B).

6) The pressing plates 120L and 120R rotate as indicated by the arrows H, and the flaps 12L and 12R of the left and right pleated side surfaces 11L and 11R of the paper bag 10 are bent. As a result, on the upper surface of the individual package 20 which is the object to be packaged, the flaps 12L and 12R of the folded side surface portions 11L and 11R with both folds are pressed by the pressing plates 120L and 120R (FIG. 7A).

7) As shown by the arrow I, the first roller 130 rolls and moves along the upper surface of the individual wrapping 20 loaded in the paper bag 10 in the bag frame 110, and one body surface portion 13 to be bent first. Flap 14 is bent. As a result, the flap 14 of one of the body surface portions 13 is pressed by the first roller 130 onto the flap 12 of the side surface portion 11 with both folds that has already been bent (FIG. 7 (b)).

8) As shown by the arrow J, the second roller 140 rolls and moves along the upper surface of the individual wrapping 20 loaded in the paper bag 10 in the bag frame 110, and the other body surface portion 15 to be bent later. Flap 16 is bent. As a result, the flap 16 of the other body surface portion 15 is pressed by the second roller 140 onto the flap 14 of the one body surface portion 13 that has already been bent (FIG. 8A).

9) In order to correct the bending position of the flap 16 of the other body surface portion 15 (considering the possibility that the bending position is bent at this stage), the second roller 140 is placed on the opposite side as shown by the arrow K. It is moved so as to escape to (Fig. 8 (b)).

10) The other body surface portion 15 formed when the opening device 150 moves as indicated by arrows L and M (translational movement and rotation) and bends the flap 16 of the other body surface portion 15 to be bent later. The two arms 150L and 150R of the opening device 150 are inserted into the mouth 15a (see FIG. 8B) (FIG. 9A). Then, as further indicated by an arrow M, the two arms 150L and 150R rotate laterally to the left and right of each other to open the mouth 15a of the other body surface portion 15 to the outside of the side surface of the paper bag 10. By forcibly opening the mouth 15a of the other body surface portion 15, the mouth 15a of the other body surface portion 15 is stretched, and the bent shape of the flap 16 of the other body surface portion 15 is adjusted (FIG. 9 (b)).

11) With the opening device 150 inserted into the mouth 15a of the other body surface portion 15, as shown by the arrow N, the second roller 140 is again loaded into the paper bag 10 in the bag frame 110. Rolls and moves along the upper surface of the (FIG. 9 (b)). As a result, the flap 16 of the other body surface portion 15 is pressed by the second roller 140 onto the flap 14 of the one body surface portion 13 that has already been bent. The second roller 140 is shown by arrows O and P so that the opening device 150 and the first roller 130 do not interfere with the second roller 140 in response to the rolling movement of the second roller 140 (indicated by the arrow N). The roller 140 is retracted to the side opposite to the moving direction of the roller 140 (FIG. 10A). The flap 14 of one body surface portion 13 coated with the pressure-sensitive adhesive is bent, and the flap 16 of the other body surface portion 15 coated with the same adhesive is bent, so that the paper bag 10 is bent by the adhesive force of the adhesive. The opening 10a is sealed (FIG. 10B).

12) The bottom surface 19 is formed by sealing the paper bag 10. After sealing the opening 10a of the paper bag 10, the pressing plates 120L, 120R, the first roller 130, the second roller 140, and the opening device 150 are retracted from the vicinity above the opening 111 of the bag frame 110 to their original positions. The pressing plates 120L and 120R translate as shown by arrow Q1 and then return to their original positions by rotational movement as shown by arrow Q2 (FIGS. 10B and 4).

13) The bag frame 110 rotates as shown by the arrow R until the sealed bottom surface 19 of the paper bag 10 faces the product discharge conveyor 160 side. As a result, the individual wrapping 20 is loaded, the paper bag 10 in which the opening 10a is sealed and the bottom surface 19 is formed falls on the slope 161 by its own weight, and is guided by the free roller 162 provided on the inclined surface as shown by the arrow S. It is moved and discharged to the carry-out position at the lower end of the slope 161 (FIG. 11 (a)).

14) As shown by the arrow T, the bag frame 110 rotates to the initial position where the opening 111 faces the hopper 210 side and waits for the next automatic sealing (FIG. 11). After that, the process returns to 1) and the packing work and automatic sealing are performed in the same procedure.

As described above, according to the present embodiment, compared with the method of 2) above, in which a series of sealing operations from individual packaging loading to sealing are all performed automatically, the packing is not fully automatic from the beginning to the end. Regarding the work, it was decided to efficiently assist the work of the operator by using the packing assisting portion 200, and the flap 12 of the side surface portion 11 with both folds, the flap 14 of one body surface portion 13 and the other body surface portion 15 Since it is a sealing device specialized in automating only the work of sequentially bending (folding) the flap 16 by the automatic sealing unit 100, the equipment introduction cost can be suppressed at low cost.
Further, since the device automatically bends and seals each flap, workability and work efficiency can be improved as compared with the method 1) above in which a series of sealing operations are manually performed.

According to this embodiment, the opening device 150 is inserted into the mouth 15a of the other body surface portion 15 so that the flap 16 of the other body surface portion 15 has a bent shape. That is, by forcibly opening both the left and right sides of the flap 16 of the other body surface portion 15 which may be curved, the mouth 15a of the other body surface portion 15 is stretched, and the flap 16 of the other body surface portion 15 is bent. The shape is adjusted. In this way, the flap 16 of the other body surface portion 15 that is bent later is in a state of being arranged in a bent shape, and the flap 16 of the other body surface portion 15 is placed on the flap 14 of the one body surface portion 13 that is bent earlier. Since the opening 10a is sealed by pressing the seal, it is possible to seal the opening with high quality without wrinkles or deterioration of the sealing accuracy such as the adhesive being displaced from the specified position. Can be done.

In this embodiment, the automatic sealing unit 100 is configured by a fully automatic device, the packing auxiliary unit 200 is configured by a manual device, and the whole is configured as a semi-automatic sealing device 300, but manually. By automating the packing work to be performed, it is possible to configure the sealing device 300 with a fully automatic device.

Further, in this embodiment, the opening device 150 is composed of two arms 150L and 150R, but this is an example, in which the mouth 15a of the other body surface portion 15 is stretched and the flap 16 of the other body surface portion 15 is stretched. The shape and number of arms, the operation of the arms, and the configuration of the opening device are arbitrary as long as the bent shape of the arm can be adjusted.

10 Paper bag, 10a opening, side surface with double folds 11 (11L, 11R), 13 one body surface, 15 other body surface, 12, 14, 16 flaps, 120 (120L, 120R) holding plate, 130 first Roller, 140, 2nd roller, 150 opening device, 150L, 150R arm

Claims (2)

A flap that protrudes toward the opening side of the packaged body after the packaged object is loaded into the inside of the paper bag through the opening of the paper bag, and is a flap on the side surface portion with both folds and one body surface portion. In a paper bag opening sealing device that seals the opening by sequentially bending the flap and the flap of the other body surface portion.
A holding plate that bends the flaps of the side surfaces with both folds and presses the flaps of the side surfaces with both folds on the upper surface of the packaged body.
A first roller that bends the flap of the one body surface portion and presses the flap of the one body surface portion onto the bent flap of the side surface portion having both folds.
A second roller that bends the flap of the other body surface portion and presses the flap of the other body surface portion onto the bent flap of the one body surface portion.
The other body surface portion is inserted into the mouth of the other body surface portion formed when the flap of the other body surface portion is bent, and the mouth of the other body surface portion is opened to the outside of the side surface of the paper bag. Equipped with an opening device that adjusts the bending shape of the flap on the body surface
With the opening device inserted into the mouth of the other body surface portion, the second roller is operated to put the flap of the one body surface portion bent onto the flap of the other body surface portion. A paper bag opening sealing device characterized by pressing a flap. The paper bag opening sealing device according to claim 1, wherein the opening device includes two arms.