JPH0687176A - Device for folding corrugated board sheet - Google Patents

Abstract

PURPOSE:To fold accurately a corrugated board sheet along its ruled line while preventing the sheet from being crushed. CONSTITUTION:Cylindrical support members 16, 16 are arranged in parallel at a given interval. More than one holes 16a are bored in the upper surface of the support member 16 at given intervals in the longitudinal direction. On the upper surface of the support member 16, a guide 18 is installed in the longitudinal direction. A channel 18a connected with the hole 16a is formed on the guide 18. An endless belt 20 set on rollers which are installed on the outside of both longitudinal end parts of the support member 16 slides on the guide 18 when the belt leaves and runs inside the support member when it returns. More than one holes 20a are bored in the endless belt 20 at given intervals in the running direction. A suction blower 26 is connected to the support member 16. A corrugated board sheet 10 is transferred stably while being stuck on the surface of the endless belt 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrugated board sheet folding apparatus, and more particularly, to corrugate a corrugated board sheet while adsorbing and holding the corrugated board sheet on an endless belt while accurately bending the corrugated board sheet along a folding ruled line. The present invention relates to a folding device that can be performed.

[0002]

2. Description of the Related Art A corrugated cardboard folding device called a folder gluer is an apparatus for automatically bending and gluing a corrugated cardboard sheet that has undergone required printing and has undergone required creasing and other processing such as slotting. Are known. The folder gluer has a folding mechanism for bending the corrugated cardboard sheet at the vertical creases (creases), a gluing mechanism for gluing the crease margin portion, and a conveying mechanism. Then, while the corrugated cardboard sheet discharged from the preceding process device (for example, printer / slotter) is conveyed to the downstream side by the conveying mechanism, the gluing mechanism performs gluing on the portion of the gluing margin, and the folding mechanism causes the required sheet portion to be cut. It is designed to be bent along vertical lines. The transport mechanism is a pair of transport belts that are spaced apart by a predetermined distance in a direction intersecting the transport direction of the corrugated cardboard and extend in parallel along the transport direction, and above each belt.
A plurality of pressing rollers arranged opposite to each other (when the corrugated cardboard sheet is folded up) is configured to be conveyed while the corrugated cardboard sheet is sandwiched by the belt and the pressing roller.

[0003]

In the conveying mechanism, in order to perform accurate bending of the sheet by the folding mechanism,
It is required to convey the corrugated board sheet in a state where the corrugated board sheet is held in a correct posture, and conventionally, the corrugated board sheet is strongly pressed against the conveying belt by the pressing roller to prevent the positional deviation. However, it is pointed out that if the pressing force of the pressing roller is set to a large value, the corrugated cardboard sheet will be crushed and the strength will be reduced. Therefore, if the pressing force of the pressing roller is set to be small, the corrugated cardboard sheet cannot be reliably sandwiched by the roller and the conveyor belt, and the corrugated cardboard sheet may be slanted with respect to the conveying direction. Accurate bending was not performed at the creases, and the glue margins were often adhered in a misaligned state, resulting in product defects.

When the thickness of the corrugated cardboard sheet is changed due to a change in order or the like, the pressing force of the pressing roller is set to an appropriate value so that the corrugated cardboard sheet can be conveyed while maintaining a correct posture without causing step collapse. It is necessary to set the value. However, it takes skill to set the pressing force of the pressing roller to an appropriate value in a short time, and an unskilled worker takes time to adjust each order change.
It is pointed out that the loss time increases.

Further, in the area where the sheet portion bent by the vertical ruled portion of the corrugated board sheet is bent by 90 ° or more, the pressing roller cannot be provided facing the conveyor belt, and the corrugated board in that area cannot be provided. The conveyance of the sheet becomes unstable, and at this time, the sheet may be misaligned to cause a defective product.

The corrugated cardboard sheet discharged from the printer / slotter is nipped and conveyed between the conveying belt and the pressing roller, so that the belt comes into contact with the undried printing portion to transfer the ink. It is pointed out that this causes the transfer to the subsequent sheet and stains. Then, the corrugated cardboard sheet having such a failure in bending and stains on the printing surface is rejected as a defective product from the viewpoint of product management, resulting in a decrease in production efficiency.

[0007]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems inherent in the above-mentioned prior art, and is proposed in order to solve this problem. Corrugated cardboard sheets are conveyed in a correct posture without being crushed. It is an object of the present invention to provide a folding device that can be bent accurately along a folding ruled line.

[0008]

In order to overcome the above-mentioned problems and to achieve the intended purpose, the present invention is to convey a corrugated cardboard sheet in a developed state, which has been slot-processed and ruled-line processed,
And a folding device capable of folding the sheet along the ruled line, the tube extending along the conveyance direction of the corrugated cardboard sheet at least from the folding start position to the folding completion position of the corrugated board sheet. -Shaped support member, a plurality of through holes formed at required intervals in the longitudinal direction of the support member, suction means that is connected to the support member and is capable of holding a negative pressure in the member, and the support. The endless belt is wound around a pair of rollers that are rotatably supported at both ends in the longitudinal direction of the member so as to be rotatable, and has a plurality of through holes formed at required intervals in the longitudinal direction. At the outer side of the support member along the perforated surface of the through hole,
On the return path, the inside of the support member is traveled, and the corrugated cardboard sheet is sucked and held on the surface of the endless belt traveling on the outward path and conveyed under the action of the internal suction of the support member.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a corrugated board folding device according to the present invention will be described below with reference to the accompanying drawings with reference to preferred embodiments. FIG. 1 is a vertical sectional front view of a folding device according to a preferred embodiment of the present invention, and FIG. 2 is a schematic side view showing the entire structure of the folding device.

As shown in the figure, a folding device 14 called a folder gluer is arranged downstream of a printer slotter 12 that performs required printing and creasing and other processes such as slotting on a corrugated cardboard sheet 10.
The folding device 14 is provided with a pair of support members 16 and 16 which are spaced apart from each other by a predetermined distance in a direction intersecting the sheet conveying direction and extend in parallel over the entire length thereof. The support member 16 is formed in a tubular shape that is open at the upstream end and the downstream end, and has a plurality of through holes 16a formed in the upper surface at predetermined intervals in the longitudinal direction. A guide 18 is provided on the upper surface of the support member 16 over the entire length in the longitudinal direction thereof, and the guide 18 has a groove portion 18a communicating with the through hole 16a of the support member 16 as shown in FIG. It is formed over the entire length. A pair of protrusions 18b, 18b are formed on the upper surface of the guide 18 so as to be slightly spaced apart from the width dimension of the endless belt 20 described later and face each other.
The endless belt 20 is configured to stably travel between the portions 18b without meandering. It is recommended that the guide 18 on which the endless belt 20 slides is made of a material having a small friction coefficient in order to achieve smooth running of the belt 20.

A plurality (two in the embodiment) of suction blowers 26 are connected to each of the support members 16 so as to communicate with each other, so that the inside of the support members 16 can be maintained at a negative pressure.
Then, the corrugated cardboard sheet 10 is configured to be suction-held on the surface of the endless belt 20 running on the upper surface of the guide 18 under the suction action inside the support member 16.

As shown in FIG. 2, a driving roller 22 and a driven roller 24 are rotatably supported outside the both ends of the supporting member 16 in the sheet conveying direction, and an endless belt 20 is provided between the rollers 22 and 24. It is wrapped around. Drive roller 22
Is connected to a drive source (not shown) via a transmission means such as a gear train and a belt, and the endless belt 20 runs by rotating the roller 22 in a predetermined direction.

The endless belt 20 is configured to run along the upper surface of the guide 18 on the outward path and to run inside the support member 16 on the return path. Further, as shown in FIG. 3, the endless belt 20 is provided with a plurality of through holes 20a at predetermined intervals in the traveling direction at a position corresponding to the groove portion 18a of the guide 18 and travels forward (travels along the guide 18). Between), the support member 1
6 is configured to communicate with the inside. That is, when the suction blower 26 is operated to form a negative pressure inside the supporting member 16, the negative pressure is generated through the through hole 16a of the supporting member 16, the groove portion 18a of the guide 18 and the through hole 20a of the endless belt 20. The suction force acts on the surface side. As a result, the corrugated board sheet 10 transferred from the printer / slotter 12 to the endless belt 20 is attracted to the endless belt 2 by suction.
It is surely adsorbed and held on the surface of 0.

Since the guide 18 having the groove 18a is interposed between the support member 16 and the endless belt 20, the endless belt 20 is strongly attracted to the upper surface of the guide 18 under suction. Is being prevented. This allows
It is possible to prevent the driving efficiency of the endless belt 20 from being lowered, and it is possible to use a driving unit having a small output.

A plurality of guide rollers 28 are rotatably supported inside the support member 16 as shown in FIG. 2, and the guide rollers 28 cause the endless belt 20 to travel along a desired route. To be done. And the blower 26
At the connecting portion between the supporting member 16 and the supporting member 16, the endless belt 20 running inside the supporting member 16 is set to face below the connecting portion (see FIG. 1), and the endless belt running on the upper surface of the guide 18 is set. It does not interfere with the suction action on 20.

The supporting members 16 and 16 are respectively supported by the carriage 32 at a plurality of positions in the longitudinal direction,
As shown in FIG. 4, the carriages 32, 32 are movably mounted on a rail 30 intersecting the sheet conveying direction.
The carts 32, 32 facing each other are configured so that they can be moved toward and away from each other by an adjusting means 34 such as a screw shaft. That is, the corrugated cardboard sheet 1 due to order changes etc.
When the outer dimension of 0 is changed, the support members 16 and 16 can be positioned at appropriate positions on the corrugated board sheet 10 by operating the adjusting means 34. The reference numeral 36 indicates the left and right sheet portions 1 of the corrugated board sheet 10.
Reference numeral 38 indicates a guide bar for bending 0a and 10a, and reference numeral 38 indicates a gluing device.

[0017]

Next, the operation of the folding device according to the embodiment will be described.

By operating the plurality of suction blowers 26, the endless belt 20 is driven to run while a negative pressure is formed inside each of the support members 16. The cardboard sheet 10 discharged from the printer / slotter 12 is
The sheet 10 is transferred to the pair of endless belts 20 and 20 running along the guides 18 and 18, and the sheet 10 is attached to the support member 1.
Endless belts 20 and 2 under the negative pressure action inside 6, 16
It is adsorbed and held on the upper surface of 0.

The corrugated cardboard sheet 10 conveyed to the downstream side as the endless belts 20, 20 travel is brought into pressure contact with the lower surfaces of the left and right sheet portions 10a, 10a against the upper holding belts or guide bars 36, 36. Bending force is applied upwards, and it is gradually bent along the ruled line.
(See Figure 1). At this time, an external force generated at the time of bending acts on the corrugated cardboard sheet 10, but since the sheet 10 is adsorbed and held by the endless belts 20 and 20, it can be bent at an accurate position without causing a positional deviation. This allows
The gluing margin portion (not shown) glued by the gluing device 38 is glued in a correct position. That is, the corrugated cardboard sheet 10 is attracted to the endless belts 20 and 20 from before the required bending of the sheet portions 10a, 10a of the corrugated cardboard sheet 10 is started to the completion of the bending of the sheet portions 10a, 10a. Since it is held, it is possible to achieve accurate folding at the folding ruled line and adhesion to the correct position of the glue margin.

Each endless belt 20 which has conveyed the corrugated cardboard sheet 10 in which the above-mentioned sheet portions 10a, 10a are folded to the discharge position is inverted by the driving roller 22 and is supported by the supporting member 16
Be introduced inside. The inside of the support member 16 has a movement of air due to the suction action of the suction blower 26, and the drying of the ink adhering to the endless belt 20 running there is promoted. Therefore, it is effective that the ink is transferred from the endless belt 20 which passes through the support member 16 and is reversed by the driven roller 24 and travels along the upper surface of the guide 18 to the corrugated paperboard sheet 10 which is newly conveyed to be contaminated. Can be prevented. In addition, from the corrugated cardboard sheet 10 to the endless belt 2
Paper dust and the like transferred to 0 are also removed when the belt 20 passes through the inside of the support member 16.

Here, when the thickness of the corrugated board sheet 10 is changed due to an order change or the like, it is possible to omit the conventional work of adjusting the pressing roller, and to shorten the cycle time required for the order change. it can. Further, the endless belt 20 has the support member 1 on the return path.
Since the vehicle runs inside 6, the drive unit is not exposed below the device, and the danger to workers in the vicinity can be eliminated. Further, since the exposure of the movable part can be suppressed, the external appearance of the mechanical device is refreshed, and there is a secondary effect that the design is improved.

[0022]

[Other Embodiments] FIGS. 5 and 6 show another embodiment of the folding device according to the present invention, which is opposed to the supporting member 16 over a required region on the upstream side. A pressure roller 38 is provided. That is, the support member 1
A supporting plate 40 is disposed above the member 6 in parallel with the member 16, and a plurality of pressing rollers 42 are rotatably supported on the supporting plate 40 at predetermined intervals. The support plate 40 is configured to be adjustable up and down via an adjusting mechanism (not shown).

Therefore, the corrugated cardboard sheet 10 discharged from the printer / slotter 12 is stably conveyed to the downstream side while being sandwiched by the pressing roller 42 and the endless belt 20. In this case, since the corrugated cardboard sheet 10 is adsorbed and held by the endless belt 20, the pressing roller 42
It is sufficient to set the pressing force of (1) to be small, and the corrugated cardboard sheet 10 is not crushed. Then, in the area where the pressing roller 42 is not provided, as described above, the corrugated board sheet 10 is stably conveyed while being attracted and held by the endless belts 20, 20.

In the embodiment, the folding device having the upper folding structure in which the required sheet portion of the corrugated cardboard sheet is folded upward has been described, but the present invention is not limited to this, and the required sheet portion of the corrugated cardboard sheet is not limited to this. It can be suitably used for a folding device having a downward folding structure that is folded downward. In the case of downward folding, it is recommended to arrange a guide bar below the corrugated cardboard sheet that is sucked and conveyed by the endless belt to prevent the sheet from falling.

In the embodiment, the corrugated cardboard sheet discharged from the pre-process apparatus has been described as being folded along the folding ruled lines, but the corrugated cardboard sheet discharged from the pre-process apparatus is in a developed state. Even when the sheet is conveyed to the post-process apparatus without being bent, the sheet can be surely conveyed without being displaced, and thus the sheet can be suitably used.

[0026]

As described above, according to the folding apparatus for corrugated cardboard sheets according to the present invention, the inside of the supporting member disposed over substantially the entire length of the folding apparatus is set to a negative pressure and the outside of the supporting member is run. Since the corrugated cardboard sheet is configured to be sucked and held by the endless belt, it is possible to prevent the sheet from being displaced and achieve accurate bending along the folding ruled line.
Further, since the corrugated cardboard sheet can be conveyed in a correct posture without using the pressing roller, when the thickness dimension of the corrugated cardboard sheet is changed due to order change or the like, it is not necessary to adjust the position of the pressing roller, and the cycle time is reduced. Can be shortened.

Further, since the endless belt runs inside the support member in which a negative pressure is formed on the return path, it is possible to accelerate the drying of the ink adhering to the belt during this time, and the endless belt is converted into a corrugated cardboard sheet. It has an advantage that ink can be prevented from being transferred and stained. Furthermore, since the traveling endless belt is not exposed below the device, it is possible to eliminate the danger to workers in the vicinity.

[Brief description of drawings]

FIG. 1 is a vertical front view showing a folding device according to an embodiment of the present invention.

FIG. 2 is a schematic side view showing an overall configuration of a folding device.

FIG. 3 is a schematic perspective view showing a main part of the folding device.

FIG. 4 is a vertical sectional front view showing a main part of the folding device.

FIG. 5 is a schematic side view showing the overall configuration of a folding device according to another embodiment of the present invention.

FIG. 6 is a vertical sectional front view of a main part of a folding device according to another embodiment shown in FIG.

[Explanation of symbols]

 10 Corrugated Cardboard Sheet 16 Supporting Member 16a Through Hole 20 Endless Belt 20a Through Hole 22 Drive Roller 24 Driven Roller 26 Suction Blower

Claims (1)

[Claims] 1. A conveyance of a corrugated cardboard sheet (10) in a developed state, which has been subjected to slot processing and ruled line processing, and the sheet
In a folding device capable of folding (10) along the ruled line, along the conveyance direction of the corrugated cardboard sheet (10), at least between the folding start position and the folding completion position of the corrugated cardboard sheet (10). A cylindrical supporting member (16) extending over the plurality of through holes, a plurality of through holes (16a) formed at required intervals in the longitudinal direction of the supporting member (16), and communicating with the supporting member (16). And a suction means (26) capable of holding the inside of the member at a negative pressure, and a pair of rollers (22, 24) which are rotatably pivoted outward at both longitudinal ends of the support member (16). And an endless belt (20) having a plurality of through holes (20a) formed at required intervals in the longitudinal direction, wherein the endless belt (20) has a support member (16) in its outward path.
In the end of the support member (16), while traveling outside along the perforated surface of the through hole (16a), inside the support member (16) on its return path, and under the action of internal suction in the support member (16). A corrugated board sheet folding device, characterized in that the corrugated board sheet (10) is sucked and held on the surface of the belt (20) and conveyed.