JP2001328181A - Cardboard sheet processing machine - Google Patents

Abstract

(57) [Problem] To provide a cardboard sheet processing machine capable of processing a ruled line that can be bent accurately without causing the cardboard sheet to be torn. SOLUTION: A pair of upper and lower ruled line creaser shafts each having a creaser ring for performing crease processing at a bent portion of a corrugated cardboard sheet, and a pair of upper and lower slotter shafts each having a cutting blade for performing slotter processing after crease processing are arranged. In the corrugated cardboard sheet processing machine, a groove-shaped concave portion not in contact with the corrugated cardboard sheet is provided at small intervals in the circumferential direction on the convex arcuate surface of the above-mentioned creasing ring for performing the corrugating process of the corrugated cardboard sheet. The concave portion prevents an excessive tension from being generated in the cardboard sheet, and a deep ruled line is processed without causing a break in the cardboard sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing machine for performing a ruled line processing and a slot processing on a corrugated cardboard sheet, and relates to a corrugated cardboard sheet processing machine capable of performing a correct processing without causing breakage in a portion to be bent of the corrugated cardboard sheet. It is.

[0002]

2. Description of the Related Art As shown in FIG. 13, a processing machine for a cardboard sheet A has a pair of upper and lower crushing shafts 30 each of which is provided with a plurality of crushing rollers 31 for crushing a portion of the cardboard sheet A to be bent. A pair of upper and lower ruled line creaser shafts 40, each of which is provided with a creaser ring 41 in front of the crushing rollers 31, and a pair of creases for forming a slot in a predetermined position of the cardboard sheet A in front of the creaser ring 41. A slotter shaft 50 to which the cutting blades 51 and 52 are attached is sequentially arranged, and this processing machine has a folding height parallel to each other, as shown in FIG. Music part 12,
The processing is performed by feeding a cardboard sheet A formed with 13 between both ends.

[0003] That is, the crushing roller 31 is applied to the corrugated cardboard sheet A by the crushing rollers 31 at intervals equal to the width of the four side walls of the body of the cardboard case at the time of manufacture, and to the bent portions 12 and 13 as shown in FIG. After crushing and forming the orthogonal linear groove 7 and further crushing the groove 7 by the creasing ring 41 to form a ruled line 8, the ruled line portion other than the body is cut into the pair of cutting blades 51. , 52 to form a flap a and form a glue margin b at one end of the trunk of the cardboard sheet A.

[0004]

The processing condition of the above-mentioned ruled line 8 has a remarkable effect on the assembling accuracy of the cardboard case by the box making machine in the next step, and when the groove depth is shallow, the part to be bent is not clear. As shown in FIG. 4, when the cardboard sheet A is bent from the ruled lines 8 and 8 and the both ends are abutted, the pasting position of the adhesive margin b becomes There is a problem that accurate setting cannot be performed and assembly with high accuracy cannot be performed.

[0005] Therefore, first, a preload is applied to the portion of the cardboard sheet A to be bent by the crushing roller 31 to crush the portion into a relatively shallow concave groove portion 7, and then the concave groove portion 7 is strongly pressed by the cleaner ring 41. By forming the ruled lines, the groove 7 is machined so that it can be bent accurately from the center of the groove width.

However, when the groove 7 and the ruled line processing on the groove 7 are performed by the crushing roller 31 and the creaser ring 41, the corrugated cardboard sheet between the adjacent crushing rollers 31 and 31 and the creaser rings 41 and 41 is formed. Excessive tension occurs in the sheet portion of A and tears occur in the sheet portions near both sides of the ruled line, which not only lowers the strength of the cardboard case when it is made, but also makes it possible to remove the cardboard from the correct part at the time of making. The sheet cannot be bent.

[0007] Such a problem is caused by first forming two ruled lines 8 forming a diagonal ridge on one diagonal line of a cardboard case at the time of manufacture, and then forming a ridge corner on the other diagonal. If the two ruled lines 8, 8 are processed,
The adjacent crushing rollers for forming these ruled lines 8
This can be solved because the sheet portion of the cardboard sheet between 31 and 31 and between the creasing rings 41 and 41 can be widened to absorb the above-mentioned tension at the time of processing. However, there is a problem that the structure becomes complicated, the cost becomes high and the production efficiency is lowered.

Therefore, at present, the space between a pair of upper and lower crushing shafts on which the crushing roller 31 and the creasing ring 41 are mounted and the interval between the ruled line creasing shafts are widened to reduce the crushing force on the cardboard sheet A. In this case, however, it is not possible to form a deep ruled line that enables accurate bending at the time of manufacturing, and it is not possible to manufacture an accurate cardboard case.

The present invention has been made in view of such a problem, and an object of the present invention is to form a deep ruled line in a bent portion of a corrugated cardboard sheet reliably and efficiently without causing the corrugated cardboard sheet to break. An object of the present invention is to provide a cardboard sheet processing machine that can perform the processing.

[0010]

According to a first aspect of the present invention, there is provided a corrugated cardboard sheet processing machine, comprising: a corrugated cardboard sheet processing apparatus; A cardboard sheet processing machine in which a mounted creaser ring and a cutting blade mounted on a slotter shaft for performing slotter processing at a predetermined portion of the portion to be bent subjected to crease processing are sequentially arranged. A plurality of recesses not in contact with the cardboard sheet are provided on the outer peripheral surface in contact with the sheet at small intervals in the circumferential direction.

According to a second aspect of the present invention, there is provided a crushing roller mounted on a crushing shaft for crushing a portion to be bent of a corrugated cardboard sheet, and a ruled line cleaner for performing a ruled line processing on the crushed portion to be bent. In a corrugated cardboard sheet processing machine, a creasing ring mounted on a shaft and a cutting blade mounted on a slotter shaft for performing slotter processing at a predetermined portion of the portion to be bent subjected to crease processing are sequentially arranged. A plurality of recesses not in contact with the corrugated cardboard sheet are provided at small intervals in the circumferential direction on the outer peripheral surface of at least one of the corrugated cardboard sheet and the creaser ring.

Further, in the cardboard sheet processing machine according to the second aspect, the invention according to the third aspect is characterized in that a crushing roller mounted on a pair of upper and lower crushing shafts and a pair of upper and lower ruled line creaser shafts are mounted. In the creaser ring, a plurality of recesses are provided at small intervals in the circumferential direction on the outer peripheral surface of the crushing roller mounted on the lower crushing shaft and the creasing ring mounted on the lower ruled line creasing shaft. It has a structure that becomes.

[0013]

When the cardboard sheet is vertically crushed and fed between the shafts, the front and rear end faces of the cardboard sheet are bent by a pair of upper and lower crushing rollers mounted on these crushing shafts into a portion to be bent (hereinafter referred to as a bent portion) of the cardboard sheet. The linear concave groove is continuously processed over the space. A plurality of pairs of upper and lower crushing rollers are mounted on the crushing shaft, and these crushing rollers crush and compress and deform several bent portions of the cardboard sheet, thereby simultaneously processing several grooves. But
When the concave groove is formed by the upper and lower crushing rollers, the cardboard sheet portions on both sides of the crushed and formed groove generate a pulling force attracted toward the groove by the compression and deformation of the portion. A tension toward these left and right groove portions is generated in the cardboard sheet portion between the crushing rollers adjacent to.

This tension increases as the gap between the upper and lower crushing rollers becomes smaller, that is, as the depth of the groove formed in the bent portion of the cardboard sheet becomes deeper. Since a plurality of recesses that do not contact the cardboard sheet are provided at small intervals in the circumferential direction on the outer peripheral surface of the cardboard, the tension is intermittently released by the recesses, and excessive tension acts continuously on the cardboard sheet. Can be prevented, and the groove can be formed in the bent portion of the cardboard sheet without causing the cardboard sheet to be broken by tension.

After the corrugated cardboard sheet passes between the vertically crushed shafts and a bent groove is formed at the bent portion thereof, and subsequently passes between the upper and lower ruled line creaser shafts,
The groove is further compressed by a creaser ring mounted on the creaser creasing shaft to form a crease at each bent portion of the cardboard sheet. Even when the crease lines are formed, tension is generated in the corrugated cardboard portion between the adjacent right and left creaser rings in the same manner as described above. Are provided at small intervals in the circumferential direction, so that the tension is intermittently released by the concave portion to prevent the cardboard sheet from being broken by excessive tension.

Further, when forming the above-mentioned groove by crushing rollers in the bent portion of the corrugated cardboard sheet and forming a ruled line by creasing in the grooves, the outer periphery of one of the crushing rollers and the creasing ring is formed. Only in the department,
Even if concave portions that are not in contact with the cardboard sheet are provided at small intervals in the circumferential direction, and the bent portions of the cardboard sheet are strongly crushed by crushing rollers or creasing rings provided with the concave portions, breakage of the cardboard sheet may occur. A deep ruled line can be formed without occurrence.

[0017] In a pair of upper and lower crushing rollers mounted on the upper and lower crushing shafts, concave portions which do not contact the cardboard sheet are provided on the outer peripheral surface at small intervals in the circumferential direction. Only one crushing roller receives the cardboard sheet in a planar manner, and the other crushing roller supports the crushing force of the one crushing roller. Such a configuration is the same for a creaser ring mounted on the upper and lower crease line creaser shafts.

Further, the cardboard sheet is fed directly between the upper and lower creaser creaser shafts without providing a crushing shaft on which the crushing rollers are mounted on the cardboard sheet processing machine, and is mounted on these creaser creaser shafts. It may be configured such that a deep ruled line is formed without causing breakage of the bent portion of the cardboard sheet by the creasing.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a simplified side view of a cardboard sheet processing machine. This processing machine includes a crushing roller 1 for forming a concave groove 7 in a bent portion of a cardboard sheet A.
A, a pair of upper and lower crushing shafts 2A, 2B on which the A and 1B are mounted, and a pair of upper and lower ruled line creasing shafts 4A, 4B on which the creaser rings 3A and 3B for applying the ruled line 8 on the concave groove portion 7 are provided. 8 comprises an upper slotter shaft 6A equipped with cutting blades 5A and 5B for applying a slotter 9 to a predetermined portion of the slotter 9 and a lower slotter shaft 6B disposed below the upper slot lock shaft 6A. A pair of upper and lower ruled line creaser shafts 4A and 4B and a pair of upper and lower slotter shafts 6A and 6B are sequentially disposed at a predetermined interval in front of 2B. In addition, a pair of upper and lower feed shafts 10 and 11 are disposed between the ruled line creaser shafts 4A and 4B and the slotter shafts 6A and 6B.

As shown in FIG. 2, the cardboard sheet A processed by this processing machine is a horizontally long rectangular cardboard sheet, and has an interval equal to the height of the trunk of the cardboard case formed by the box making machine. The front and rear two straight bent portions 12 and 13 which are parallel to each other are formed in advance between both short side edges, and the cardboard sheet A is processed by the above-described processing machine as shown in FIG. And the above-mentioned ruled line 8 in which three corners of the body of the cardboard case are bent and the above-mentioned slotter 9 in which the flap a of the cardboard case is formed.

That is, the ruled line 8 is formed between the front and rear straight bent portions 12 and 13 at every horizontal width interval of the wall surface forming the body of the cardboard case from one side edge of the cardboard sheet A. The bent portions A, B, and C of the cardboard sheet A are set by these ruled lines 8. Also,
The slotter 9 has bent portions a at a portion between the front end of the cardboard sheet A and the front straight bent portion 12 and at a portion between the rear end of the cardboard sheet A and the rear straight bent portion 13. It is formed on an extension of each ruled line 8 forming b and c.

Accordingly, in the cardboard sheet processing machine, the crushing rollers 1A and 1B mounted on the pair of upper and lower crushing shafts 2A and 2B and the creaser ring 3A mounted on the pair of upper and lower ruled line creaser shafts 4A and 4B. , 3B, at each width interval of the width of the wall forming the body of the cardboard case on each axis, that is, the position facing one side edge of the cardboard sheet A, and the bent parts a, b, C and the cardboard sheet A are disposed at a position facing the other side edge.

More specifically, as shown in FIG.
A roller 1A 'for pressing the upper surface of one side edge of the cardboard sheet A is attached to one side end in the length direction.
While the crushing rollers 1A are respectively mounted at the bent portions A, B, and C at the predetermined intervals from 1A 'and the position pressing the upper surface of the other side edge of the cardboard sheet A, the lower crushing is performed. Each of the above-mentioned rollers 1A 'attached to the upper crushing shaft 2A is attached to the shaft 2B.
, 1A, a plurality of pairs of upper and lower rollers are provided by mounting rollers 1B 'and 1B opposed to each other with a small interval.

Similarly, a pair of upper and lower ruled line creaser shafts 4A and 4B
As shown in FIG. 6, the upper creaser shaft 4A has the upper creaser ring at the positions of the bent portions A, B, and C and at the position where the upper surface of the other side edge of the cardboard sheet A is pressed.
While the 3A is mounted, the lower creasing ring 3B is mounted on the lower ruled line creasing shaft 4B at predetermined intervals so as to form a pair with the upper and lower creasing rings 3A.
A support ring 3B 'for supporting one side edge of the cardboard sheet A is attached to only one end of the lower ruled line creaser shaft 4B in the longitudinal direction.

Further, all the rollers 1A ', 1A and the creaser ring 3A mounted on the upper crushing shaft 2A and the upper ruled line creaser shaft 4A, and one end of the lower crushing shaft 2B, The outer peripheral surfaces of the roller 1B 'and the creasing ring 3B' attached to one end of the lower ruled line creaser shaft 4B are formed on flat pressing surfaces 14 and 15 which are flatly pressed against the cardboard sheet A. On the other hand, the roller 1 on one side end side attached to the lower crushing shaft 2B and the lower ruled line creaser shaft 4B
Attached to the other crushing rollers 1B and the creasing ring 3B except for B 'and the creasing ring 3B', that is, the positions corresponding to the bent portions A, B, and C of the cardboard sheet A and the other end of these shafts. As shown in FIGS. 7 and 8, the outer peripheral surfaces of the crushed roller 1B and the creasing ring 3B are formed on convex arcuate surfaces 16 and 17 on which the above-described concave grooves 7 and ruled lines 8 are formed in the cardboard sheet A, respectively. A plurality of groove-shaped concave portions 18 and 19 which do not contact the cardboard sheet A are provided at small intervals in the circumferential direction on the convex arc-shaped outer peripheral surface.

Although the shapes of the recesses 18 and 19 are not particularly limited, in the crushing roller 1B and the creaser ring 3B shown in FIGS. 7 and 8, these crushing rollers 1B orthogonal to the crushing shaft 2B and the creaser creasing shaft 4B are shown. Convex arc-shaped surface 1 with the creasing ring 3B
The virtual center line d passing through the vertices of 6 and 17 is formed in semicircular recesses 18 and 19 that gradually become wider and gradually deeper toward the outer surface of the crushing roller 1B and the creasing ring 3B from the e. ing. These concave portions 18 and 19 are provided on both side surfaces of the convex arcuate surfaces 16 and 17 divided by the imaginary center line d and e, respectively, at small intervals in the circumferential direction and on one side surface side. And the recesses 18 and 19 provided on the other side are provided in a staggered arrangement in the circumferential direction, so that the recesses 18 on one side pressing the cardboard sheet A are provided.
Concave portions 18 and 19 on the other side face are disposed so as to face the pressing contact portions 16a and 17a between 18 and 19 and 19, respectively.

On the other hand, the structure of the upper and lower slotter shafts 6A and 6B on which the above-mentioned cutting blades 5A and 5B for applying the flap a forming slotter 9 to the cardboard sheet A are circularly connected to the upper slotter shaft 6A, as is well known. Each creaser ring 3B in which a plate-shaped support member 20 is mounted on the upper ruled line creaser shaft 4A
Are fixed at predetermined intervals so as to face the front of the cardboard sheet A, and at predetermined intervals in the circumferential direction on the outer peripheral portion of each of the support members 20, that is, the interval between the two front and rear straight bent portions 12 and 13 of the cardboard sheet A. The cutting blades 5A and 5B are installed. Further, a disc-shaped lower blade holder 21 for receiving the cutting blades 5A and 5B mounted on the support member 20 facing the respective support members 20 of the upper slotter shaft 6A is fixed to the lower slotter shaft 6B. I have. The supporting member 20 on the other end of the upper slotter shaft 6A.
The cutting blades 5A and 5B are formed so as to cut and form the adhesive margin b at the other end of the cardboard sheet A.

When the corrugated cardboard sheet A before processing is supplied to the corrugated cardboard sheet processing machine configured as described above, first, as shown in FIG. 5, the corrugated cardboard sheet A is mounted on one end side of the vertical crushing shafts 2A and 2B. A pair of upper and lower rollers 1A 'and 1B' hold one end of the cardboard sheet A at the same time as other crushing rollers mounted on these vertically crushing shafts 2A and 2B.
1A, 1B by the bent part of the cardboard sheet A, b,
The upper and lower surfaces of c and the other end are pressed, and the upper crushing roller 1A
With the flat outer peripheral surface as the receiving surface, the lower surface of the above-mentioned bent portion A, B, C and the other side end is crushed by the convex arc-shaped outer peripheral surface 16 of the lower crushing roller 1B to form a concave arc cross section. Is formed.

At the time of forming the concave groove portion 7, the folded portion A of the corrugated cardboard sheet A is formed by the upper and lower crushing rollers 1A and 1B.
When the b and c and the other end are crushed,
In accordance with the amount of crushing by the convex arcuate surface 16 of 1B, the virtual center line d of the convex arcuate surface 16 is centered on the portion of the cardboard sheet A on both sides of the concave groove 7 formed by the convex arcuate surface 16. A tension is generated in a direction in which the cardboard sheet A is drawn toward the arcuate surface portions on both sides, and the portion of the cardboard sheet A between the adjacent crushing rollers 1B, 1B is pulled in a direction in which the width is increased.

However, the convex arc-shaped surface 16 of the crushing roller 1B
As described above, since a plurality of groove-shaped concave portions 18 that are not in contact with the cardboard sheet A are provided at small intervals in the circumferential direction,
The tension is generated by pressing the corrugated cardboard sheet A when the press contact surface portion 16a between the adjacent concave portions 18 and 18 presses against the corrugated cardboard sheet A. When the concave portion 18 passes through the corrugated cardboard sheet surface, the tension is generated. Are absorbed and dispersed in the concave portions 18 and become small, so that the groove portions 7 having desired depths can be formed in the bent portions A, B and C without breaking the cardboard sheet A by tension.

The cardboard sheet A is slid vertically 2A,
2B, the concave groove portion 7 is formed over the entire length from the rear end to the front end of the cardboard sheet A at the above-mentioned bent portions A, B, and C, and subsequently, the upper and lower ruled line creaser shafts 4A, 4B
The grooves 7 are further crushed by the creasing rings 3A and 3B mounted on the upper and lower creaser shafts 4A and 4B, and the grooves 7 are further crushed.
Formed.

As shown in FIG. 6, when forming the ruled line 8, the flat outer peripheral surface of the upper creaser ring 3A is formed on the upper receiving surface of the cardboard sheet A as shown in FIG. As the convex arcuate surface 17 of the lower creasing ring 3B, the lower surface of the bent part A, B, C and the other side end,
That is, the groove 7 formed by the lower crushing roller 1B is processed and formed into a ruled line 8.

At this time, the convex arc-shaped portions are formed on the cardboard sheet A on both sides of the ruled line 8 formed by the convex arc-shaped surfaces 17 in accordance with the amount of crushing by the convex arc-shaped surfaces 17 of the lower cleaner ring 3B. Tension is generated in a direction to be drawn toward the arcuate surface portions on both sides of the virtual center line E on the surface 17, and the portion of the cardboard sheet A between the left and right adjacent creaser rings 3B, 3B is pulled in a direction in which the width is increased, Like the crushing roller 1B, the convex arcuate surface 17 is provided with a plurality of groove-shaped concave portions 19 that are not in contact with the cardboard sheet A at small intervals in the circumferential direction, so that tension is generated by pressing the cardboard sheet A. This is done when the pressing surface portion 17a between the adjacent concave portions 19, 19 is pressed against the cardboard sheet A. When the concave portion 19 passes through the cardboard sheet surface, the above-mentioned tension is absorbed by the concave portion 19,
The cardboard sheet A is dispersed and becomes small, and the deep ruled line 8 can be formed at the bent portions A, B, and C without damaging the cardboard sheet A by tension.

After forming the ruled line 8 by the upper and lower creaser rings 3A and 3B, the corrugated cardboard sheet A is immediately sent between the upper and lower slotter shafts 6A and 6B by the feed shafts 10 and 11 to form the above-mentioned straight line forming the trunk of the cardboard case. The cardboard sheet A is formed by the cutting blades 5A and 5B while leaving the ruled line 8 between the folding curves 12 and 13.
The slot 9 is cut and formed in a ruled line between the front end and the front straight fold curve 12 and a ruled line between the rear end of the cardboard sheet A and the rear straight fold curve 13. Is formed as a lid portion and a flap a serving as a bottom when assembled into a cardboard case, and a glue margin b is formed at the other end of the cardboard sheet A.

The corrugated cardboard sheet A on which the ruled line 8 and the slotter 9 have been processed in this manner is continuously fed to a gluing / bending machine (gluwer machine) in the next step, and is bent from the ruled line 8 as shown in FIG. The adhesive margin piece b on the other side is adhered to one side edge to produce a cardboard case.

In the above embodiment, the outer peripheral surfaces of the crushing roller 1B and the creasing ring 3B mounted on the lower crushing shaft 2B and the lower ruled line creaser shaft 4B respectively are formed by forming the recess 1
The outer peripheral surfaces of the crushing rollers 1A and the creasing ring 3A which are formed on the convex arcuate surfaces 16 and 17 having 8, 19, respectively, but are respectively mounted on the upper crushing shaft 2A and the upper ruled line creaser shaft 4A side. Are formed on the convex arcuate surfaces 16 and 17 having the concave portions 18 and 19, and the outer peripheral surfaces of the crushing roller 1B and the creasing ring 3B mounted on the lower crushing shaft 2B and the lower ruled line creaser shaft 4B, respectively. May be formed on a flat surface that receives the lower surface of the cardboard sheet A.

In the crushing rollers and the creaser ring, whose outer peripheral surfaces are formed on the convex arcuate surfaces 16 and 17, the concave portions 18 and
The shape and arrangement of 19 are as described above, with the crushed rollers, the respective imaginary center lines d and e of the creaser rings, i.e., the arcuate surfaces on both sides of the convex arcuate surfaces 16 and 17 except for the top surfaces. Although it is formed, as shown in FIGS.
The concave portions 18 and 19 may be provided on the top surfaces of the parts 6 and 17 so that a part of the concave parts 18 and 19 may intersect or be inclined, respectively. Further, as shown in FIGS. The convex arcuate surfaces 16 and 17 with, the oblong concave oval shape 18,
The longitudinal center portions of these concave portions 18 and 19 are located at the virtual center line D and E, and the longitudinal end portions of these concave portions 18 and 19 are not arranged in a staggered circumferential direction. May be arranged in a state of being aligned in the circumferential direction. Further, the width, depth, angle, number of the recesses 18 and 19, and the number of the recesses 18 and 19 may be appropriately set.

Further, in the present invention, the tension generated in the corrugated cardboard sheet A during processing is dispersed and reduced by the concave portions 18 and 19 provided on the convex arcuate surfaces 16 and 17 of the crushing roller and the cleaner ring, respectively. Therefore, the concave portion is provided on one of the convex arc-shaped surfaces of the crushed roller and the creaser ring, and the corrugated cardboard sheet A is damaged by the crushed roller having no concave portion or the convex arc-shaped surface of the creaser ring. The cardboard sheet A may be processed by a crushing roller having a concave portion or by a crusher ring with a large crushing force to form a deep ruled line.

Further, the cardboard sheet A is directly fed between the upper and lower ruled line creaser shafts 4A, 4B without providing the vertical crushing shafts 2A, 2B having the crushing rollers 1A, 1B mounted on the processing machine. In this case, one of the creaser rings 3A and 3B attached to the upper and lower ruled line creaser shafts 4A and 4B may be formed in a convex arcuate surface having the above-mentioned concave portion.

[0040]

As described above, according to the corrugated cardboard sheet processing machine of the present invention, the corrugated cardboard sheet is mounted on the outer peripheral surface of the crushing roller mounted on the crushing shaft forming the concave groove portion or on the ruled line creaser shaft. Since a plurality of recesses that do not contact the cardboard sheet are provided at small intervals in the circumferential direction on the outer peripheral surface of the creaser ring, when forming a groove or a ruled line on this groove at the bent portion of the cardboard sheet. The concave portion releases the tension generated in the cardboard sheet, thereby reliably preventing the excessive tension from being generated in the cardboard sheet. Therefore, the cardboard sheet has excellent strength without causing the cardboard sheet to be torn. Sheets can be manufactured.

Further, since the deep groove or the ruled line can be accurately and efficiently formed in one process by the crushing roller or the creaser provided with the concave portion on the outer peripheral surface, the productivity can be improved only. Rather, it is possible to accurately bend from a ruled line and to manufacture a highly accurate cardboard case.

[Brief description of the drawings]

FIG. 1 is a simplified side view of a cardboard sheet processing machine,

FIG. 2 is a simplified perspective view of a cardboard sheet before processing;

FIG. 3 is a simplified perspective view of a cardboard sheet on which ruled lines and a slotter are formed.

FIG. 4 is a simplified perspective view showing a state of being bent from a ruled line;

FIG. 5 is a simplified vertical sectional front view showing a concave groove processing state by crushing rollers;

FIG. 6 is a simplified perspective view showing a crease processing state by creaser ring;

7A is a front view of a crushing roller, FIG. 7B is a side view thereof,

8 (A) is a front view of the creaser ring, FIG. 8 (B) is a side view thereof,

FIG. 9A is a front view showing another structure of the crushing roller,
(B) is a side view thereof,

10A is a front view showing another structure of the creaser ring, FIG. 10B is a side view thereof,

11A is a front view showing another structure of a crushing roller, FIG. 11B is a side view thereof,

12A is a front view showing still another structure of the creaser ring, and FIG. 12B is a side view thereof.

FIG. 13 is a simplified side view of a cardboard sheet processing machine showing a conventional example.

[Explanation of symbols]

 A Corrugated cardboard sheet 1A, 1B Crush roller 2A, 2B Crush shaft 3A, 3B Creaser ring 4A, 4B Creaser creaser shaft 5A, 5B Cutting blade 6A, 6B Slotter shaft 7 Concave groove 8 Ruler line 9 Slotter, B, C , 19 recess

Claims (3)

[Claims] 1. A creaser ring mounted on a creaser creaser shaft for performing crease processing on a portion to be bent of a corrugated cardboard sheet, and a cutting blade mounted on a slotter shaft for performing slotter processing on a predetermined portion of the creased portion on which crease processing is performed. In the cardboard sheet processing machine, which is sequentially arranged, a plurality of recesses not in contact with the cardboard sheet are provided at small intervals in the circumferential direction on the outer peripheral surface in contact with the cardboard sheet in the creasing ring. Cardboard sheet processing machine. 2. A crushing roller mounted on a crushing shaft for crushing a portion to be bent of a corrugated cardboard sheet, a creaser ring mounted on a creaser creasing shaft for forming a crease on the crushed portion to be bent. In a corrugated cardboard sheet processing machine in which a cutting blade mounted on a slotter shaft for performing slotter processing at a predetermined position of the part to be bent subjected to crease processing is sequentially disposed, at least one of the crushing roller and the creasing ring is provided. A cardboard sheet processing machine characterized in that a plurality of recesses not in contact with the cardboard sheet are provided on the outer peripheral surface in contact with the cardboard sheet at small intervals in the circumferential direction. 3. A crushing roller mounted on a crushing shaft and a pair of upper and lower creaser rings mounted on a ruled line creaser shaft are disposed so as to sandwich a cardboard sheet to be processed. 3. A plurality of recesses are provided at small intervals in the circumferential direction on an outer peripheral surface of a crushing roller mounted on the lower surface and a creaser ring mounted on a lower ruled line creaser shaft. A cardboard sheet processing machine as described.