JP2024008183A - Sealing device and expanding jig used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To propose a new technique for suppressing a folding failure of a flap of a carton, in a sealing device for an A-type corrugated cardboard carton.

SOLUTION: A sealing device 1 for a carton has: a rotary arm 12; a first pressing roller 14 provided on a lower end side of the rotary arm 12; a second pressing roller 16 in which a position of a rotary shaft is fixed; and a pair of folding bars 18, wherein a front flap 21 is folded by the second pressing roller 16, a rear flap 22 is folded by the first pressing roller 14, and a side flap 23 is folded by a pair of folding bars 18. At the rotary arm 12, an expanding jig 3 is provided. After the front flap 21 is slightly folded by the expanding jig 3 coming into contact with the front flap 21 before a corner part 12a of the rotary arm 12, the side flap 23 is pressed in an opening direction from the inside to the outside by the expanding jig 3.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a sealing device for closing and sealing the top plate of a carton made of cardboard or other thick paper, and more particularly to a technique for preventing folded flaps from interfering with each other.

Conventionally, as disclosed in Patent Document 1, for example, a sealing device is known that automatically closes a flap and applies tape while transporting a cardboard box.

Patent Document 1 discloses a flap closing mechanism that includes a front flap folding member, a rear flap folding member, and left and right flap folding members. The carton is placed on the conveyor so that its longitudinal direction is parallel to the conveyance direction, and first, the front flap folding member closes the front flap located at the front side of the opening when viewed from the conveyance direction side. Next, the rear flap folding member closes the rear flap located on the rear side of the opening when viewed from the conveyance direction side. Next, the left and right flap folding members close the left and right flaps located on the left and right sides of the opening when viewed from the conveyance direction side.

JP 2019-147583 Publication

The carton sealed in Patent Document 1 is a so-called A-type cardboard carton, and is transported with the front flap, rear flap, and left and right flaps on the top side up, and the front flap and rear flap are folded in by a flap closing mechanism. After that, the left and right flaps are folded in.

In this folding process, if the opening angle of the left and right flaps is narrow and tilted, the front flap that is folded in first will interfere with the left and right flaps, resulting in a folding failure in which the front flap is pressed by the left and right flaps and becomes taut. This may occur, and transport of the carton may be hindered.

In view of the above, the present invention proposes a new technique for suppressing the folding failure of the carton flap in a type A cardboard carton sealing device.

The problem to be solved by the present invention is as described above, and next, means for solving this problem will be explained.

One form of the present invention includes a rotating arm, a first pressing roller provided on the lower end side of the rotating arm, a second pressing roller whose rotating shaft is fixed in position, and a pair of folding bars. and a carton sealing device that folds a front flap by the second pressing roller, a rear flap by the first pressing roller, and a side flap by the pair of folding bars, An opening jig is provided, and the front flap is first folded in slightly by contacting the front flap with the expansion jig, and then the side flap is opened from the inside to the outside by the expansion jig. This is a pressurized carton sealing device.

Further, in one form of the present invention, the expansion jig includes an arcuate contact portion for contacting the front flap and a pressing end portion for contacting the inner surface of the side flap, and and pressing ends formed at both ends of the arc-shaped abutment part, and the arcuate shape of the abutment part has a tip end located at an intermediate position between the opposing side flaps that is adapted to convey the carton. It shall be constructed so as to protrude most toward the upstream side of the direction.

Further, in one form of the present invention, the expansion jig is constructed by bending a rod-shaped member.

Further, in one form of the present invention, a rotating arm, a first pressing roller provided on the lower end side of the rotating arm, a second pressing roller whose rotating shaft is fixed in position, and a pair of folding bars, The expanding jig used in a carton sealing device has a front flap folded in by the second pressure roller, a rear flap folded in by the first pressure roller, and a side flap folded in by the pair of folding bars. The expansion jig is provided on the rotating arm, and the expansion jig first contacts the front flap to slightly fold the front flap, and then folds the side flaps from the inside to the outside. This is an expanding jig used in a carton sealing device that presses the carton in the opening direction.

According to the present invention, since the opening angle of the side flaps is widened in advance by the expansion jig, folding defects in which the front flaps interfere with the side flaps and are not folded in but are stretched as they are are suppressed, and the conveyance of the carton is stopped. It is possible to prevent problems such as

It is a side view showing an outline of a sealing device. It is a top view showing an outline of a sealing device. (A) is a diagram illustrating how the side flap is opened by the expansion jig. (B) is a diagram showing the configuration of the expansion jig. (A) is a plan view showing a situation where the rotating arm is in a standby position. (B) is a side view showing a situation where the rotating arm is in a standby position. (A) is a plan view showing a state in which the expansion jig is in contact with the front flap. (B) is a side view showing a state in which the expansion jig is in contact with the front flap. (A) is a plan view showing a state in which the rotating arm is raised beyond the rear flap. (B) is a side view showing a state in which the rotating arm is raised beyond the rear flap; (A) is a plan view showing a state in which pressing of the front and rear flaps is started by a first pressing roller and a second pressing roller. (B) is a side view showing a state in which pressing of the front and rear flaps is started by the first pressing roller and the second pressing roller. (A) is a plan view showing a state in which the front and rear flaps are pressed by a first pressing roller and a second pressing roller. (B) is a side view showing a state in which the front and rear flaps are pressed by a first pressing roller and a second pressing roller. (A) is a plan view showing how the side flap is folded in by a folding bar. (B) is a side view showing how the side flap is folded in by the folding bar. (A) is a plan view showing a situation in which all flaps are closed. (B) is a side view showing a situation in which all flaps are closed.

As shown in FIGS. 1 and 2, the sealing device 1 is for closing the top plate side of cartons 20 that are sequentially conveyed by a conveyor 2. As shown in FIGS.

The sealing device 1 includes a rotating arm 12 that is rotated by a drive device such as a motor (not shown), a first pressing roller 14 provided at the lower end of the rotating arm 12, and a first pressing roller 14 whose rotating shaft is fixed in position. It includes two pressing rollers 16 and a pair of folding bars 18 and 19. A tape pasting device (not shown) is provided downstream, and tape is pasted so as to close each flap closed by the sealing device 1.

As shown in FIG. 3(A), the cartons 20 that are sequentially transported by the conveyor 2 have a front flap 21 located downstream in the transport direction and a rear flap 21 located upstream in the transport direction. 22 and the left and right side flaps 23, 24 are transported in an open state. The contents are stored in the carton 20, and each flap is closed by the sealing device 1. The carton 20 is a so-called A-type cardboard carton in which the front flap 21 and the rear flap 22 are folded in first, and then the left and right side flaps 23 and 24 are folded in and sealed.

To explain in detail below, as shown in FIGS. 1 to 3(A), the rotating arm 12 has a substantially L-shape when viewed from the side, and a corner portion 12a thereof is attached to the front flap of the carton 20 being conveyed. Wait at the position facing 21.

As shown in FIGS. 1 to 3(A), the rotating arm 12 is configured to contact the front flap 21 with respect to the carton 20 being conveyed before the corner portion 12a of the rotating arm 12, and the side flap An expansion jig 3 is provided for pressing the openings 23 and 24 in the direction of opening them outward.

In this embodiment, the expansion jig 3 shown in FIGS. 3A and 3B is constructed by bending a bar member, and is shaped like a fan in plan view. The expansion jig 3 is provided so as to protrude in the horizontal direction from the corner portion 12a, and waits at a position facing the front flap 21 of the carton 20. Further, the expanding jig 3 is configured to have a width in a lateral direction Y perpendicular to the transport direction X of the carton 20 in a horizontal plane, and contacts the inside of the side flaps 23 and 24 to open the side flap 23. , 24 in the direction of opening outward.

Further, as shown in FIG. 3(B) and FIG. 4(A), the expansion jig 3 has an arcuate contact portion 31 for contacting the front flap 21, and a contact portion 31 for contacting the front flap 21, and the side flaps 23, 24. It has pressing ends 32, 32 for contacting the inner surface, and fixing parts 33, 33 for being fixed to the rotating arm 12. The distance between the pressing ends 32, 32 at both ends, that is, the width Wa of the expansion jig 3 in the lateral direction Y is configured to be wider than the distance Wf between the inner surfaces of the side flaps 23, 24 in an upright state.

As shown in FIGS. 1 to 3(A), a first pressing roller 14 is freely rotatably provided at a position horizontally opposite to the corner portion 12a in the rotating arm 12. As shown in FIGS. The first pressing roller 14 is for pressing and folding the rear flap 22 from above. The first pressing rollers 14 are arranged at the ends of the rotating arm 12 in the transport direction X and on both sides of the rotating arm 12 in the lateral direction Y.

As shown in FIGS. 1 to 3(A), a second pressing roller 16 is arranged at a position downstream of the first pressing roller 14 of the rotating arm 12 in the standby position. The second pressing roller 16 is supported by the bracket 51 so as to be freely rotatable. The second pressing roller 16 is for pressing and folding the front flap 21 from above.

As shown in FIGS. 1 and 2, a pair of folding bars 18 and 19 are provided downstream of the second pressing roller 16 in the conveyance direction of the carton 20. Each folding bar 18, 19 is provided so as to extend in the transport direction of the carton 20, and is configured such that the distance between them becomes narrower from upstream to downstream. The folding bars 18 and 19 are supported by a bracket 52 so as to face each other in a horizontal plane. The folding bars 18 and 19 are for pressing and folding the side flaps 23 and 24 from the outside, respectively.

Sealing in the above configuration will be explained.
FIGS. 4A and 4B show a situation in which the rotating arm 12 is in a standby state, and the carton 20 is being transported.

As shown in FIGS. 5(A) and 5(B), at the same time as the carton 20 approaches, the rotating arm 12 rises, and the tip of the expansion jig 3 contacts the front flap 21, and the front flap 21 moves to the side flap 23. , 24 is slightly folded inside. Next, while the corner portion 12a is in contact with the front flap 21, the rotating arm 12 rises as it is, and passes over the rear flap 22 to reach the state shown in FIGS. 6(A) and 6(B).

Next, as shown in FIGS. 7(A) and 7(B), the rotating arm 12 that has been raised is lowered, and the first pressing force is applied at the timing when the front flap 21 of the moving carton 20 comes into contact with the second pressing roller 16. The roller 14 is brought into contact with the rear flap 22. Then, as shown in FIGS. 8A and 8B, the front flap 21 and the rear flap 22 are folded in parallel by the second pressing roller 16.

Next, as shown in FIGS. 9A and 9B, when the carton 20 moves further, the side flaps 23 and 24 enter between the folding bars 18 and 19, as shown in FIGS. 10A and 10B. Finally, the side flaps 23 and 24 are pressed from the outside by the folding bars 18 and 19 and folded.

As described above, the front flap 21, rear flap 22, and side flaps 23 and 24 on the top plate side of the carton 20 are folded in order and sealed.

As described above, in the present invention, as shown in FIGS. 1 and 2, the rotating arm 12 is rotated by a drive device such as a motor (not shown), and the first rotating arm 12 is provided at the lower end of the rotating arm 12. It has a pressing roller 14, a second pressing roller 16 whose rotating shaft is fixed in position, and a pair of folding bars 18, 19.The second pressing roller 16 folds the front flap 21, and the first pressing roller 14 The carton sealing device 1 is a carton sealing device 1 in which a rear flap 22 is folded in by a pair of folding bars 18 and 19, and side flaps 23 and 24 are folded in by a pair of folding bars 18 and 19. The arm 12 is provided with an expansion jig 3, and after the expansion jig 3 contacts the front flap 21 before the corner portion 12a of the rotating arm 12, the front flap 21 is slightly folded. The side flaps 23 and 24 are pressed by the expansion jig 3 in an opening direction from the inside toward the outside.

As a result, when the rotating arm 12 rises and the front flap 21 is slightly folded in by the corner portion 12a, or when the front flap 21 is folded in by the second pressing roller 16, the front flap 21 is folded into the side flap. This prevents the front flap 21 from being folded incorrectly due to interference with the front flaps 23 and 24. In other words, since the opening angle of the side flaps 23 and 24 is widened in advance by the expansion jig 3, it is possible to prevent the front flap 21 from interfering with the side flaps 23 and 24 and causing a folding failure in which the front flap 21 is not folded in but remains stretched. , it is possible to prevent problems such as transportation of the carton 20 being stopped.

Further, as shown in FIGS. 3(A) and 4(A), the expansion jig 3 has an arcuate contact portion 31 for contacting the front flap 21, and an inner surface of the side flaps 23, 24. The pressing end portions 32, 32 are formed at both ends of the arcuate contact portion 31, and the arcuate shape of the contact portion 31 is configured such that the tip portion 31a located at an intermediate position between the opposing side flaps 23 and 24 protrudes most toward the upstream side in the transport direction of the carton 20.

As a result, the expansion jig 3 first contacts the front flap 21 at the tip 31a of the contact portion 31, and then gradually extends the side flaps 23, 24 while lightly contacting the inner surfaces of the side flaps 23, 24. It can be expanded and the movement of the carton 20 can be prevented.

Further, as shown in FIGS. 4A and 4B, the expansion jig 3 is constructed by bending a rod-shaped member.

Thereby, the expansion jig 3 can be implemented with a simple configuration. The expansion jig 3 is provided on the rotating arm 12, and first contacts the front flap 21 to slightly fold the front flap 21, and then opens the side flaps 23 and 24 from the inside to the outside. It is something that puts pressure on people.

1 Sealing device 2 Conveyor 3 Expanding jig 12 Rotating arm 12a Corner part 14 First pressing roller 16 Second pressing roller 18 Folding bar 19 Folding bar 20 Carton 21 Front flap 22 Back flap 23 Side flap 24 Side flap 31 Contact Part 31a Tip part 32 Pressing end part 51 Bracket 52 Bracket

Claims (4)

a rotating arm;
a first pressing roller provided on the lower end side of the rotating arm;
a second pressing roller in which the position of the rotating shaft is fixed;
It has a pair of folding bars;
Folding the front flap by the second pressing roller,
Folding the rear flap by the first pressing roller,
A carton sealing device that folds side flaps using a pair of folding bars,
The rotation arm is provided with an expansion jig, and after the front flap is slightly folded by contacting the front flap with the expansion jig, the side flap is folded in from the inside by the expansion jig. A carton sealing device that is pressed in the outward opening direction. The expansion jig includes an arcuate contact portion for contacting the front flap;
a pressing end for contacting the inner surface of the side flap, the pressing end being formed at both ends of the arc-shaped contact portion;
The configuration has the following:
The arcuate shape of the abutment part is configured such that the tip part positioned at an intermediate position between the opposing side flaps protrudes most toward the upstream side in the conveyance direction of the carton.
The carton sealing device according to claim 1, characterized in that: The expansion jig is constructed by bending a rod-shaped member.
The carton sealing device according to claim 2, characterized in that: a rotating arm;
a first pressing roller provided on the lower end side of the rotating arm;
a second pressing roller in which the position of the rotating shaft is fixed;
It has a pair of folding bars;
Folding the front flap by the second pressing roller,
Folding the rear flap by the first pressing roller,
An expanding jig used in a carton sealing device that folds side flaps using a pair of folding bars,
The expansion jig is provided on the rotating arm,
The expansion jig first contacts the front flap and folds the front flap slightly, and then
An expansion jig used in carton sealing devices that presses the side flaps in the opening direction from the inside to the outside.