JPS622981B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for automatically forming a box by folding a box-making material from a bent part while conveying the material. A simple structure of the box material prevents product loss from unfolding in the direction of the original position due to the restoring force of the bent part during the bending process. This device is related to the bending maintenance device for glue allowance, etc., and is arranged with a slight gap above the automatic box making machine, intersects with the transport direction of the box material 5, and has the upper side inclined toward the transport direction. Box material 5 from fold 51k
A bending guide plate 3 provided with a rise regulating body 4 for the upper end of the box material at a height that almost matches the length to the upper end.
Then, a transport position detector 7 of the box-making material provided on the box-making material feeding side of the bending guide plate 3, and in conjunction with the detection by this detector 7, the tip portion of the box-making material 5 is bent. Folding guide plate 3 that lifts up to guide plate 3
In an automatic box-making machine, the box-making material bending device is comprised of a box-making material leading edge lifting piece 8 provided on the lower side of the box-making material feeding side, above the box-making material leading edge lifting piece 8. Then, on the upper side of the folded part such as the folded glue part of the box material 5 being transported, a glue part presser piece 9 whose tip is swingable is placed so that its tip is pressed against the bending guide plate 3. It is characterized in that it is positioned with a gap between it and the lower end of the box-making material feeding side, and its lower surface is positioned at a height such that there is a slight gap between it and the box-making material 5 being transported.

Generally, in order to automatically form a box by folding the box material from the bending part while transporting it, for example, in the case of a rectangular box with a lid, the folding process is carried out as shown in Figure 1 A to G. will be carried out.

That is, first, the glue allowance portions 5c to 5f are bent 180 degrees inward from the folds 51c to 51f, and then the diagonal bent pieces 5a and 5b, which also serve as glue allowance, are bent.
is bent outward by 180 degrees from the folds 51a and 51b, and then the glue allowance parts 5e and 5f are bent outward by 180 degrees from the diagonal fold 51g of one long side box thick piece 5g.
゜ bent, and then the long side box thick piece 5g is
It is bent 180 degrees inward from the fold 52g, and then both short side box thick pieces 5h and 5i are bent 180 degrees inward from the respective folds 51h and 51i,
Then, the lid portion 5j is bent 180 degrees inward from the inner fold 51k of the folds 51k and 51j of the other long box thick piece 5k, forming a folded box A. .

Here, it goes without saying that a crease groove is formed at each fold so that folding is easy.

Among these folding steps, in the case of folding the lid portion 5j, which is the final folding step, in order to fold the lid portion 5j from the crease 51k, temporarily remove the adhesive portion 5.
c and 5d are released from being held between conveyor belts 1 and 2, which will be described later.

At this time, the adhesive portions 5c and 5d are at the fold 5.
The lid portion 5 has been bent due to the restoring force of the portions 1c and 51d trying to unfold toward the original position.
The adhesive portions 5c and 5d may be crushed by the glue portions 5c and 5d, and the adhesive portions 5c and 5d may be folded in a deformed form, resulting in product loss.

In order to prevent this, conventionally the conveyor belts 1 and 2
At the same time when the adhesive portions 5c and 5d are released from the clamped state, there is a device that blows high-pressure air from the side to the adhesive portions 5c and 5d to prevent them from expanding in the direction of their original positions due to their restoring force. .

However, when using this method, for example, if the box material 5 is made of paper such as cardboard or cardboard that has a large repulsive force at the folded part, and the box is shallow and has narrow glue margins 5c and 5d, high-pressure air is used. In some cases, the restoring force of the folds 51c and 51d cannot be resisted.

In other words, when the box is shallow with narrow glue margins 5c and 5d, high-pressure air will be blown near the folds 51c and 51d;
The closer you get to the glue margin parts 5c, 5d, the weaker the pressing force of the high-pressure air on the glue margin parts 5c, 5d becomes.
It has become difficult to maintain the bent state of 5d, causing product loss.

The present invention solves these unresolved problems with a mechanism that has a simple structure and can be installed on existing automatic box making machines.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the apparatus for maintaining folding, such as glue allowance, for box-making materials according to the present invention will be described below with reference to the drawings, with reference to the case where the rectangular box is folded.

The box material 5 is placed on a lid portion 5j on a pair of upper and lower endless annular box material conveyor belts 1 and 2 that are constantly moving.
is held in front and conveyed from the rear to the front of an automatic box making machine (not shown). During this conveyance, the upper conveyor belt 1 is once returned at the lid bending process position, and the upper conveyor belt 1a is installed again in an endless ring shape at a predetermined interval. Within this interval, above the automatic box making machine on the front upper conveyor belt 1a side, that is, above the lower conveyor belt 2,
Folding guide plates 3 are installed at slight intervals to allow the folded box A to pass through.

The bending guide plate 3 is perpendicular to the conveyance direction of the box material 5, has its upper side inclined toward the conveyance direction, and has a height that almost matches the length from the upper end of the lid portion 5j to the fold line 51k. A rise regulating body 4 at the upper end of the box material is attached.

On the back side of the folding guide plate 3, that is, on the front side of the upper conveyor belt 1a, there is a folded box A sent from between the lower end of the folding guide plate 3 and the lower conveyor belt 2. A retraction roller 6 is attached to be pressed against the lower conveyor belt 2.

At the center of the bending guide plate 3 on the box material feeding side and below the lower conveyor belt 2, there is a transport position detector 7 for detecting when the leading edge of the box material 5 passes;
A known box-making material whose tip is driven up and down by an air cylinder or solenoid, which lifts the lid portion 5j of the box-making material 5 up to the bending guide plate 3 in conjunction with the detection by the detector 7. Tip piece 8
will be installed.

Above the folding piece 8 of the leading edge of the box material 5, above the folded glue portions 5c to 5f of the box material 5 being conveyed, that is, above the lower conveyor belt 2, there is a tip. A glue margin pressing piece 9 that is configured to be swingable is provided.

As for this adhesive section holding piece 9, the rear end of the swinging piece 9a is pivotally attached to the holding piece 9, and a spring 9b is stretched on the rear end so that its tip is always positioned downward. The one that is supported is used.

Here, the strength of the spring is such that it has enough elasticity to allow the lid portion 5j of the box material 5 to be lifted up to the bending guide plate 3 by the lifting piece 8 at the tip of the box material, and has enough elasticity to The material used is elastic enough to prevent the folded portions 5a to 5i from unfolding due to their restoring force.

If this condition is satisfied, the rocking piece 9
a can be replaced with a leaf spring.

The glue margin holding piece 9 is located at a position where the tip of the swinging piece 9a is spaced slightly apart from the lower end of the bending guide plate 3 on the box material feeding side, that is, the box material 5 is placed between the two. It is positioned with a gap that allows it to pass through, and the lower surface is at a height where there is a slight gap with the box material 5 to be transported, that is, the height where there is no hindrance to the transportation of the box material 5, and the glue allowance. The other bent portions 5a to 5i are placed at a height where they cannot be unfolded due to their restoring force.

In the figure, 10 is a guide roller of the lower box material conveyance belt 2, 11 is a pinch roller of the upper box material conveyance belt 1, 1a that can be raised and lowered according to the thickness of the box material 5, and 12 is one side. Between the upper box material conveyor belt 1 and the glue margin presser piece 9, the lower conveyor belt 2
A pinch roller is shown for preventing expansion of the folded piece of the box material 5 disposed above, the adhesive portions 5a to 5i, etc. due to the restoring force.

In this embodiment, the bent portion of the box material 5 is 1
Although it is shown being held between a pair of conveyor belts 1 and 2, this folded portion is spaced at such an interval that the unfolding due to the restoring force of the folded piece and the adhesive portions 5a to 5i is prevented. set and fixed upper and lower 1
The box material 5 may be moved between a pair of metal belts, and the center portion of the box material 5 may be held between the upper and lower pair of conveyor belts 1 and 2 and transported. is self-evident.

Next, an example of how the device of this embodiment is used will be explained.

The box-making material 5 is transferred from the rear of an automatic box-making machine (not shown) to the upper and lower conveyor belts 1 and 2 with the lid portion 5j facing forward.
If the first
As shown in Figures A to F, each bent portion 5a
5i to 5i are bent according to the conventional method from each of the folds 51a to 51i and 52g, and in this state the box material 5 is conveyed to the final folding step of the lid portion 5j.

When the box material 5 is transported to this final step and its tip reaches the transport position detector 7, the detector 7
detects this, and in conjunction with the detection signal, the tip of the box material tip lifting piece 8 is lifted at a predetermined timing, as shown in the sixth figure.
After the tip of the transported box material 5 is lifted up to the bending guide plate 3, it is returned to its original position.

At this time, the tip of the swinging piece 9a of the glue margin holding piece 9 comes into contact with the top surface of the box material 5, but since the elasticity of the swinging piece 9a is weak, there is no problem in lifting the tip of the box material 5. do not have.

Even if the glue margin portion 5c advances beyond the gap between the lower conveyor belt 2 and the pinch roller 12 and the pinching state is released, the gap between the lower surface of the swinging piece 9a of the glue margin portion pressing piece 9 and the lower conveyor belt 2 is a gap that prevents the expansion of the glue allowance portion 5c, so the expansion of the glue allowance portion 5c does not occur at this portion, and even if the box material 5 is further conveyed and reaches the bending guide plate 3. As shown in FIG. 7, the swinging piece 9a is pressed against the glue portion 5c, so that the bent state of the glue portion 5 is maintained.

When the box material 5 is further conveyed, its tip rises along the bending guide plate 3, but the long side box thick piece 5
When the inner fold 51k of the box material 5 is conveyed to just below the folding guide plate 3, the tip of the box material 5 hits the rise regulating body 4, and further rise is prevented, as shown in Figure 8. At the same time, as the box material 5 is further conveyed, the lid portion 5j is bent from the fold line 51k, and its upper end is reversed along the rise regulating body 4 in the bending direction.

At this time, since the swinging piece 9a has returned to its original position, the folded portion of the fold 51k and the glue portion 5c are
Although it is slightly separated from the tip, the fold 51c of the adhesive portion 5c has already been bent toward the folded piece 5a, so the restoring force of the fold 51c prevents it from unfolding.

When the box material 5 is further conveyed, as shown in FIGS. 9 and 10, the box material 5 is conveyed forward from between the bending guide plate 3 and the lower conveyor belt 2 with the fold 51k as the tip. Ru.

Box material 5 transported forward from the bending guide plate 3
is conveyed further forward by the pull-in roller 6 and the lower conveyor belt 2 that is constantly moving, and is again held between the upper and lower conveyor belts 1a and 2, and the folded box A is conveyed forward. be done.

As described above, according to the device of the present invention, the glue margin presser piece whose tip is swingable is simply disposed on the upper surface of the glue margin and other bent parts of the box material being conveyed. This allows you to maintain the bent state of the glue allowance, etc.
Not only can the structure of this part of an automatic box making machine be extremely simple, but it can also be easily installed in existing automatic box making machines, and the folding condition can be reliably maintained due to glue allowance, etc., and the folding box can be produced at high speed. It has various excellent effects as a bending maintenance device for gluing, etc. of box-making materials, such as not causing product loss during molding.

[Brief explanation of the drawing]

The drawings show an embodiment of the apparatus for maintaining folding, such as glue allowance, for box-making materials according to the present invention. A plan view of the main parts, FIG. 3 is a side view thereof, FIG. 4 is a partial cross-sectional view of the adhesive holding piece, FIG. 5 is an enlarged view of the top piece of the box material, and FIG. 6 10 to 10 are explanatory diagrams showing the process of bending the box material. DESCRIPTION OF SYMBOLS 1, 2...Box material conveyor belt, 1a...Upper conveyor belt, 3...Folding guide plate, 4...Rise regulator, 5...Box material, A...Folded state Box, 5c...Glue allowance, 5d...Glue allowance, 5j
...Lid part, 51k...Inner fold of box thick piece on the other long side, 7...Transportation position detector, 8...Boxing material tip lifting piece, 9...Gluing margin presser piece , 9a... rocking piece, 9b... spring.

Claims (1)

[Claims] 1 A slight gap is arranged above the automatic box making machine, the upper side is inclined in the conveying direction so as to intersect with the conveying direction of the box making material 5, and the box making material 5 is placed from the fold 51k of the box making material.
A bending guide plate 3 provided with a rise regulating body 4 for the upper end of the box material at a height that almost matches the length to the upper end.
Then, a transport position detector 7 of the box-making material provided on the box-making material feeding side of the bending guide plate 3, and in conjunction with the detection by this detector 7, the tip portion of the box-making material 5 is bent. Folding guide plate 3 that lifts up to guide plate 3
In an automatic box making machine, the box material bending device is comprised of a box material leading edge lifting piece 8 provided on the lower side of the box material feeding side of the box material feeding side. Then, on the upper side of the folded part such as the folded glue part of the box material 5 being conveyed, a glue part presser piece 9 whose tip is swingable is placed so that its tip is pressed against the bending guide plate 3. The box material 5 is positioned with a gap between it and the lower end of the box material feeding side, and the lower surface is positioned at a height such that there is a slight gap between the box material 5 and the transported box material 5. A device for maintaining the bending of box materials, such as glue allowance.