JP2899797B2 - Cardboard box material folding ruler and box making machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a folding ruled line used for folding a box material for manufacturing a cardboard box so as to form a folding line in a stepwise direction, and a mechanism for forming the folding ruled line. And a box making machine having the same.

[0002]

To manufacture a box from corrugated cardboard, the following is usually done.

[0003] First, a cardboard box material 1 shown in FIG. 1 is formed from cardboard paper. That is, punching is performed in the shape of FIG. 1 to form ruled lines 2, 3, 4, 5, 6, and 7. These ruled lines are linearly crushed from the inner surface when bent. While transferring the box material 1 from the top to the bottom in the figure, the box material 1 is folded along the ruled lines 5 and 7 using a twist belt or the like, and the glue margin 8 is adhered. Normally, a box maker determines that a flat state is obtained by simply applying this bonding and that the box is finished, and the box is sold in this state.

In the manufacture of this box, defective products such as the box 9a in FIG. 2 and the box 9b in FIG. 3 occur. The box 9a has a shape in which the rear portion of the box 9a at the time of conveyance during the manufacturing process is widened, and is called a fishtail phenomenon. In the box 9b, the overlapping portion of the glue margin 8 is too large than normal. In addition, there are defective products in which the overlap of the eight portions of the glue margin is too small, or the overlapping portion is shifted back and forth.

[0005] In this box material 1, the corrugations of corrugated cardboard are usually oriented vertically as shown in Fig. 1 in order to withstand the stacking load. The crease lines 5 and 7 are bending crease lines that are bent in this manufacturing process, and their directions match the corrugations of the corrugated paper. In the case of folding along a ruled line matching the corrugation of corrugated paper, the bent line is unstable, cannot be folded normally, and is likely to cause the above-mentioned defective product.

The reason for this instability is considered as follows. That is, when the formed ruled line is bent, the center of the corrugated paper is crushed in a portion inside the ruled line and adjacent to the ruled line, but since the unevenness of the core is often not symmetrical with respect to the ruled line, The crushability becomes asymmetric,
Thereby, the folding line actually formed at the time of folding may move from the position of the ruled line.

For this reason, the folding lines of the ruled lines 5 and 7 are shifted,
Defective products such as the box 9b are generated. In particular, since the bending is performed using a twist belt or the like, the bending is gradually performed from the front at the time of bending, and thus the folding line is gradually shifted and inclined, and the fishtail phenomenon like the box 9a is likely to occur. Further, since the flap is bent while being pressed from the outside, excessive folding like the box 9b is likely to occur.

As a countermeasure, the inventor of the present invention pushed a short straight line extending in a direction perpendicular to the main ruled line portion adjacent to the crushed main ruled line portion into a shape in which many short straight lines were arranged along the main ruled line portion. A folded ruled line provided with a crushed adjacent portion has been proposed (Japanese Patent Application Laid-Open No. 9-70905).

According to this folding ruled line, the core is corrugated with the main ruled line portion as a folding line, and when the cores of the corrugated paper collide with each other and are crushed, the average strength of the core is reduced by the adjacent portions. As a result, it is easily crushed, so that the folding line at the time of folding is prevented from being displaced, and can be bent at an accurate position. In addition, since the adjacent portion has the center core intermittently crushed, it is possible to prevent the main ruled line portion from being unclear and the folding line from being displaced when folded.

However, if the adjacent portions are excessively provided, naturally,
The ruled line portion becomes unclear and the folding line is displaced. For this reason, the amount of the adjacent portion must be minimized.
The optimal amount of this adjacent part depends on the properties of the corrugated paper, the shape of the box,
It is determined by the dimensions, characteristics of the box making machine, and the like, and it is difficult to know in advance.

As a means for providing the adjacent portion, the inventor of the present application has proposed that the box material be formed at the same time as the box material is cut out by the cutting device (the same publication).
Although it is excellent in mass productivity and can reduce the occurrence of defective products, it is difficult to completely prevent the generation of defective products because the setting of the amount of the adjacent portion is not optimal.

In view of the above, the present invention provides a new ruled line and a new ruled line forming means which further improve the above-mentioned folded ruled line and facilitates setting the amount of the adjacent portion optimally. It is intended.

[0013]

The folded ruled line according to the present invention comprises the above-mentioned ruled line portion and an adjacent portion, and the adjacent portion is asymmetrical in a part or the whole of the entire length of the ruled line portion. In this manner, the folding line is effectively prevented from being displaced and bent in a specific direction during folding. You
In other words, the adjacent portion is provided only on the side opposite to the direction in which the folding line at the time of folding is likely to be displaced.

More specifically, in the present invention, in order to prevent the fishtail phenomenon, in the transport direction of the cardboard box material, the front portion is outside the main ruled portion and the rear portion is inside the main ruled portion. Is formed with an adjacent portion.

In order to prevent excessive folding,
An adjacent portion is formed outside the main ruled line portion in the transport direction of the cardboard box material.

With such a configuration, in the folded ruled line, the displacement of the folding line at the time of folding can be more effectively prevented, and the setting of the amount of the adjacent portion can be easily performed.
That is, even if the amount of the adjacent portion is not strictly set, it is possible to surely prevent the folding line from being displaced.

Further, in the box making machine of the present invention, an adjacent portion forming means is provided between the sheet feeding step and the folding step, and the shape and amount of the adjacent portion formed here can be adjusted.

More specifically, the present invention relates to a timing conveyor provided between a paper feeding step and a folding step, for conveying a cardboard box material at a predetermined timing, and an upper portion of the cardboard box material sent from the timing conveyor. And an adjacent forming roller that rotates in synchronization with the timing conveyor, and is detachably attached to a peripheral end of the adjacent forming roller, is formed on the upper surface of the cardboard box material, and is formed in At a position adjacent to the main ruled line portion formed by being crushed from the upper surface so as to extend in the eye direction, a number of short straight lines extending in a direction perpendicular to the main ruled line portion are arranged along the main ruled line portion in a shape. A projection that is crushed to form an adjacent portion, and the projection is bent in accordance with any of the above-described bent portions.
It is a box-making machine arranged to form a ruled line .

As a structure for providing a projection, for example, an adjacent portion forming roller is detachably attached to a groove formed at the peripheral end and is formed in this groove to form a projection having one or more shapes. Alternatively, it may have two or more types of projection pieces.

With this configuration, in this box making machine, a box can be manufactured from a box material, and the shape and amount of the protrusion can be adjusted in accordance with the state of the box. Can be easily realized.

[0021]

FIG. 4 shows an embodiment of a folding ruled line according to the present invention.

The cardboard box material 10 is for preventing the fishtail phenomenon. In this box material 10, the folding ruled lines 11 and 12 are both configured as shown in FIGS. 5 and 6, and the other ruled lines 13, 14, 15, and 16 are formed into the same linear shape as that of the related art, and become the inner surface at the time of bending. It is crushed from. Each of the folding ruled lines 11 and 12 includes the main ruled line portions 11a and 12a and the adjacent portions 11b and 11b.
b ', 12b and 12b'. This ruled line portion 11a,
12a extends linearly in the direction of the corrugation 17 of the corrugated cardboard, and is crushed from the inner surface when folded. Adjacent part 1
Each of 1b, 11b ', 12b, and 12b' is formed by crushing a large number of short straight lines perpendicular to the main ruled lines 11a and 12a along the main ruled line from the inner surface at the time of bending. The adjacent parts 11b and 12b are
With respect to the transport direction (downward direction in the figure), it is located on the front side, outside the main ruled lines 11a and 12a, that is, on the side of the flap lifted in the folding step. The adjacent portions 11b 'and 12b' are located at the rear portion with respect to the transport direction (downward direction in the figure) of the box material 10, and are formed inside the main ruled portions 11a and 12a, that is, on the side opposite to the flap lifted in the bending step. Have been.

Since the folding ruled lines 11 and 12 have the above-described structure, they operate as follows. When the sheet is folded along the folding ruled line, first, similarly to the conventional ruled line, it can be normally folded with the main ruled line portions 11a and 12a as folding lines. Further, when the cores of the corrugated paper are folded and collided with each other and are crushed, the bent cores are intermittently crushed by the adjacent portions 11b, 11b ', 12b and 12b' in the direction along the main ruled line. The average strength of the core is reduced and is easily crushed. Therefore, the folding line at the time of folding is prevented from being shifted, and the folding can be performed at an accurate position.

In addition, in the front portion in the transport direction where it is first bent, the folding line at the time of folding tends to be shifted inward, but in this ruled line, in this portion, the adjacent portions 11b and 12b are provided only outside the main ruled line portion. Therefore, inward displacement is effectively prevented. Also, in the rear part in the transport direction that is folded later, the folding line at the time of folding tends to shift outward, but in this ruled line, the adjacent part 11b ′,
Since 12b 'is provided only inside the main ruled line portion,
Outward displacement is effectively prevented. Thus, the fishtail phenomenon is prevented.

The width of the adjacent portion (the length in the left-right direction in FIG. 5), the interval (the interval between short straight lines in FIG. 5), the existing ratio (the ratio of the width of the short straight line to the interval between the short straight lines in FIG. 5), Crushing depth (in Fig. 6, the thickness reduction)
Can be variously set. Further, the crushing depth of the ruled line portion may be set to be equal to or less than the thickness of the paper, or may be set to protrude beyond the thickness of the paper, that is, to the opposite side of the paper.

FIG. 7 shows another form of the folding ruled line according to the present invention.

The cardboard box material 20 prevents excessive folding. In this box material 20, the folded ruled lines 21 and 22 are both the main ruled line portions 21a and 22a.
And adjacent portions 21b and 22b, and other ruled lines 23 and 2
Nos. 4, 25, and 26 are crushed in a line shape similar to that of the related art from a surface that is inside when folded. The ruled line portions 21a and 22a extend linearly in the direction of the steps of the corrugated paper and are crushed from the inner surface during folding. Adjacent portions 21b and 22b are both ruled line portions 21a and 22a.
Is formed by arranging a large number of short straight lines perpendicular to the main ruled line portion from the inner surface at the time of bending.
The adjacent portions 21b and 22b are arranged in the main ruled line portions 21a and 22a with respect to the transport direction (the downward direction in the drawing) of the box material 20.
, That is, on the side of the flap that is lifted in the folding process.

Since the folded ruled lines 21 and 22 have the above-described structure, they operate in the same manner as in the above-described embodiment, and the average strength of the center of the portion adjacent to the main ruled line portion is reduced, so that they are easily crushed. Therefore, the folding line at the time of folding is prevented from being shifted, and the folding can be performed at an accurate position.

Moreover, since the flap is pushed inward during bending, the folding line at the time of folding tends to shift inward. However, in this ruled line, the adjacent portions 21b and 22b are provided only outside the main ruled line portion. , That is, excessive folding is effectively prevented.

Although each of the above embodiments is for preventing the fishtail phenomenon and excessive folding, there are various modes in which defective products are likely to occur depending on the properties of the corrugated paper, the shape and dimensions of the box, and the like. Various modes other than those described above can be used in accordance with this mode.

8 to 10 show one embodiment of the box making machine of the present invention.

In the box making machine 30, an adjacent portion forming step portion 31 shown is provided between a sheet feeding step and a bending step (both not shown). Box machines are usually
Various auxiliary processes can be added between the paper feeding process and the folding process, and the adjacent portion forming process portion 31 can be easily provided in an existing box making machine.

In the adjacent portion forming step portion 31, the timing conveyor 32 is formed of a chain with a claw or the like, and is supplied with the cardboard box material 3 supplied one by one from the sheet feeding step.
3 at a predetermined timing.

The belt conveyors 34, 34 receive the box material 33 from the timing conveyor 32, convey it from above and below, and send it to the next bending step. Along the belt conveyors 34, 34, an adjacent portion forming roller 35
A receiving roller 36 is provided at a lower portion.

The adjacent portion forming roller 35 rotates in synchronization with the timing conveyor 32, and is formed by crushing the cardboard box material 33 to be conveyed from the upper surface so as to extend in the conveying direction and in the stepwise direction. The main ruled line portion 37 is located at the center of the width. It should be noted that the main ruled line portion 37 becomes the main ruled line portion of the above-described ruled line of the present invention after passing through the adjacent portion forming step portion 31, and is provided in a normal form on a normal box material. The ruled line itself. The receiving roller 36 is installed directly below the adjacent portion forming roller 35, supports the lower surface of the box material 33,
The box material 33 is crushed by the adjacent portion forming roller 35.

A number of grooves 38 are formed at the peripheral end of the adjacent portion forming roller 35. Separately, protrusions 39,... Are prepared. These protrusions 39,.
The pressing plates 40, 40 are fixed to both sides of the roller 35 by screwing, and the front end protrudes to form a projection 41. The protruding piece 39 is formed to have a shape in which the tip is only half of the entire width, and can be fitted in the groove 38 by inverting left and right.

Adjacent part forming part 31 of this box making machine 30
Is configured as described above, if the projections 39 are attached to appropriate grooves 38 in appropriate directions,
On the box material 33, the adjacent portion 42 can be formed by crushing a short straight line extending in a direction perpendicular to the main ruled line portion into a large number of lines along the main ruled line portion on one side of the main ruled line portion 37.

Therefore, the folding ruled lines 11, 12, 21, and 22 shown in FIGS. 4 and 7 can be formed by selecting the mounting position and the orientation of the projecting pieces 39,. Further, the amount of the adjacent portion of the folding ruled line can be adjusted. In the above example, normal ruled lines are formed on the box material to be supplied. However, it is assumed that the ruled lines of the box material to be supplied already include the main ruled line portion and the adjacent portion, and the box forming machine is further new. May be added.

In the above example, only one type of projection piece is used, the tip of which has only one half of the entire width. It is also possible to use. Further, a concave groove or the like may be formed on the peripheral end of the receiving roller so that the crushing by the protrusion is more effectively performed. In addition, the protrusions
Needless to say, it may be formed by other means.

[0038]

As described above, since the folding ruled line of the present invention has an adjacent portion adjacent to the ruled line portion, the folded ruled line is folded, and when the cores of the corrugated paper collide with each other and are crushed. The average strength of the core is reduced by the adjacent portions, and the core is easily crushed. For this reason, the folding line at the time of folding is prevented from shifting, and the folding can be performed at an accurate position. Further, since the center of the adjacent portion is intermittently crushed, the ruled line portion is not clear and the folding line at the time of folding does not shift.

Further, since the folded ruled line of the present invention is formed so that the adjacent portion is asymmetrical in the right and left over part or the entire length of the ruled line portion, the position of the folding line in a specific direction at the time of folding, bending, for example, The tail phenomenon and excessive folding can be prevented very effectively. Therefore, it is easy to set the amount of the adjacent portion so as not to be excessive or excessive.

Further, in the box making machine of the present invention, an adjacent portion forming means is provided between the sheet feeding step and the folding step so that the shape and amount of the adjacent portion formed here can be adjusted, so that the test is conducted on a trial basis. Then, the corrugated box material is processed to check the occurrence of defective products, and then the shape of the adjacent portion can be set. Therefore, the properties of the cardboard, the shape and dimensions of the box,
According to the characteristics of the box making machine and the like, it is possible to realize an adjacent portion having an optimal form.

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a plan view of a normal box material having a surface facing inside when bent. The corrugated paper surface is partially peeled off to expose the corrugations.

FIG. 2 is a plan view of a defective box completed by bending the box material of the preceding figure.

FIG. 3 is a plan view of another defective box completed by bending the box material of FIG. 1;

FIG. 4 is a plan view of a box material showing an embodiment of a folding ruled line according to the present invention, the surface of which is an inner side at the time of bending being a surface;

FIG. 5 is an enlarged plan view of a folding ruled line portion in the preceding figure.

FIG. 6 is an end view taken along the line AA of the preceding figure.

FIG. 7 is a plan view of a box material showing another embodiment of the folding ruled line according to the present invention, with a surface facing inside when folded, as a surface;

FIG. 8 is a side view showing an embodiment of the box making machine of the present invention, showing an adjacent portion forming step.

FIG. 9 is an enlarged side view of an adjacent portion forming roller portion of the preceding figure.

FIG. 10 is an enlarged sectional view of an adjacent portion forming roller portion of FIG. 8;

[Explanation of symbols]

10: Corrugated cardboard box material, 11, 12: Bending ruled line, 1
1a, 12a ... regular ruled line portions, 11b, 11b ', 12b,
12b '... adjacent part. 20 ... cardboard box material, 21, 22
... bending ruled line, 21a, 22a ... this ruled line portion, 21b,
22b ... adjacent part. Reference numeral 30: box making machine, 31: adjacent portion forming step portion, 32: timing conveyor, 33: cardboard box material, 35: adjacent portion forming roller, 36: receiving roller, 37
... this ruled line portion, 38 ... groove, 39 ... projection piece, 41 ... projection body,
42 ... adjacent part.

Claims (5)

(57) [Claims] 1. A main ruled line portion extending in a step direction of a cardboard box material and squashed from a surface which is inside when folded,
A number of short straight lines adjacent to the main ruled line portion and extending in a direction perpendicular to the main ruled line portion are arranged along the main ruled line portion,
An adjacent portion that is crushed from a surface that is inwardly folded, and the adjacent portion is in a direction in which a folding line at the time of folding is likely to be displaced in part or the entire length of the main ruled line portion
Located only on the side opposite to
Effectively prevent misalignment and bending of the folding line during folding.
Folded ruled line of cardboard box material stopped . 2. A main ruled line portion extending in a step direction of the cardboard box material and crushed from a surface which is inside when folded,
A number of short straight lines adjacent to the main ruled line portion and extending in a direction perpendicular to the main ruled line portion are arranged along the main ruled line portion,
It consists of an adjacent portion that is crushed from the inside surface at the time of folding, and this adjacent portion is outside the main ruled line portion in the front portion with respect to the conveying direction of the cardboard box material,
In the rear part, a folded ruled line of cardboard box material that is formed inside the main ruled line portion and prevents the fishtail phenomenon. 3. A ruled line portion extending in the direction of the corrugation of the cardboard box material and crushed from a surface which is inside when folded,
A number of short straight lines adjacent to the main ruled line portion and extending in a direction perpendicular to the main ruled line portion are arranged along the main ruled line portion,
It consists of an adjacent portion that is crushed from the inside surface at the time of bending, and this adjacent portion is formed outside the ruled line portion in the conveying direction of the cardboard box material, and the cardboard box material that is prevented from being excessively folded is formed. Fold rule. 4. A timing conveyor provided between a paper feeding step and a folding step, for transporting a cardboard box material at a predetermined timing; and a timing conveyor provided on an upper part of the cardboard box material sent from the timing conveyor. The adjacent portion forming roller rotating in synchronization with the adjacent portion forming roller is detachably attached to the peripheral end thereof, is formed on the upper surface of the cardboard box material, extends in the transport direction, and extends in the step direction.
At a position adjacent to the main ruled line portion formed by crushing from the upper surface, a number of short straight lines extending in a direction perpendicular to the main ruled line portion are arranged along the main ruled line portion to form an adjacent portion by crushing. Claims 1 to 3
Are arranged to form one of the folding rules
That made box machine. 5. The at least one adjacent roller according to claim 4, wherein the adjacent portion forming roller has a groove formed at a peripheral end thereof and is detachably attached to the groove to form one or more protrusions having one or more shapes. A box-making machine characterized by having projections of the following types.