JP4718980B2 - Corrugating machine and production management device used therefor - Google Patents

Description

  The present invention relates to a corrugating machine and a production management apparatus used therefor.

In the corrugating machine, a back liner is bonded to a core cored in a wavy shape with a single facer to form a single-sided cardboard, and a liner is bonded to the single-sided cardboard with a double facer to form a double-sided cardboard.
After the double facer passes through the double facer, a slit or ruled line is made in the conveying direction by a slitter scorer, and then cut in the width direction by a cutoff device to form a cardboard sheet, which is stacked on a stacker and sequentially discharged.
The back liner, core and front liner base papers are supplied by rewinding the roll paper, and when one roll paper is used up, it is continuously supplied by splicing to another roll paper. .

Depending on the user's order, the production length per order varies from several pick-up meters to several thousand meters, and the type (size, paper quality) of the corrugated cardboard sheet is different for each order. For this reason, corrugator machines continuously produce several hundreds of different orders of corrugated sheet per day.
The predetermined length and the required number of cardboard sheets to be produced are set in advance in the production management device for each order, and the operation of each part is managed (controlled) so that the production management device produces cardboard sheets corresponding to each order. ing.

Double-sided corrugated cardboard cut by the cut-off device includes, for example, corrugated sheets such as the back liner, center core and front liner paper joints, or a mixed portion such as slits between the current order and the next order when the slitter scorer is reordered. There is a defective part that does not become a product.
The cardboard sheet including the defective portion is discharged as a defective cardboard sheet separately from the product.
Conventionally, this defective portion is cut by so-called cutting length removal that cuts at the same product cutting length Ls as the product, or a cutting length that is different from the product is fixed, and this fixed cutting length Lp is set. So-called fixed length removal that cuts was used.
However, since the cutting length of each of these is determined regardless of the length of the defective part, there is a problem that the product loss is large, for example, the defective corrugated cardboard sheet includes many parts that can be made into products. (See FIGS. 6, 7, 9, and 10)

In order to solve this problem, for example, one disclosed in Patent Document 1 has been proposed.
This means that the length of the defective portion is detected and cut with the product cutting length Ls of the current order or the next order, and the remaining portion is cut with the length of the portion as the removal cutting length Lt. However, when the length of the surplus portion is equal to or less than the cutting limit dimension of the cutoff device at the current line speed, this cutting limit dimension is set as the removal cutting length Lt. (See FIGS. 6, 7, 9, and 10)
As a result, product loss can be greatly reduced.

Japanese Patent No. 2515192

However, in the one shown in Patent Document 1, the cutting length of a defective corrugated cardboard sheet is always equal to or smaller than the product cutting length of the corrugated cardboard sheet that is a product. The cutting length of the sheet is also reduced.
If the cutting length of the defective cardboard sheet is reduced, the number of cut sheets increases, and there is a problem that it cannot be used for other purposes, for example, a laying paper for moving a corrugated cardboard sheet as a product to another place.
Some users demand to reduce the number of defective corrugated cardboard sheets to be cut or to make the cut length of the defective corrugated cardboard sheet a predetermined length and effectively use it. Can not cope with.

  In view of the above problems, an object of the present invention is to provide a production management apparatus including a cut-off length control unit that can greatly reduce product loss and can meet various needs of users, and a corrugating machine using the same. And

In order to solve the above problems, the present invention employs the following means.
That is, the corrugating machine according to the present invention controls a cut-off device that cuts cardboard that is continuously conveyed into a cardboard sheet by cutting it in a direction substantially perpendicular to the conveyance direction, and at least the cutting length of the cut-off device. A corrugating machine having a cut-off length control unit and a production management device that controls the operation of the entire apparatus, the cut-off length control unit being capable of changing the maximum cut length when cutting defective parts The maximum cutting length setting part that can be set, the minimum cutting length setting part that can be set to change the minimum cutting length at the time of cutting a defective part, and the maximum cutting length and the minimum cutting according to the defective part length existing in the cardboard A defective cutting length calculation unit for calculating a defective cutting length and the number of defective cuttings positioned between the two is provided.

In this way, the defective cutting length calculation unit calculates the defective cutting length and the number of defective cuttings positioned between the set maximum cutting length and the minimum cutting length in accordance with the defective portion length existing in the cardboard. By controlling the cutting length of the cut-off device according to the defective cutting length and the number of defective cutting, the defective corrugated cardboard sheet can be cut in accordance with the defective portion.
Therefore, the defective corrugated sheet hardly includes a good portion that becomes a product, so that the product loss can be greatly reduced.
Further, if the set value of the maximum cutting length in the maximum cutting length setting unit is increased, the number of defective corrugated cardboard sheets can be reduced.
In consideration of ease of handling, it is preferable to limit the maximum cutting length to a length that allows the defective cardboard sheet to be discharged well.

Furthermore, since the length of the defective cardboard sheet is always longer than the minimum cutting length, if the set value of the minimum cutting length in the minimum cutting length setting portion is increased, a long defective cardboard sheet can be obtained, For example, it can be effectively used as a laying paper for protecting the cardboard sheet bundle when the cardboard sheet bundle is placed or conveyed.
If the maximum cut length and the minimum cut length are set to the same length, the defective corrugated cardboard sheet is subjected to so-called fixed length removal in which the cardboard sheet is cut at a constant length.
In this way, it is possible to handle both operations that can significantly reduce product loss, operations that simplify the processing of defective corrugated cardboard sheets, and operations that can effectively use defective corrugated cardboard sheets. Can do.

  In the corrugating machine according to the present invention, the defective cutting length calculation unit calculates the temporary defective cutting length by dividing the defective portion length by the number of defective cuttings as one, and calculating the temporary defective cutting length. When the defective cutting length is smaller than the minimum cutting length, the minimum cutting length is the defective cutting length. When the temporary defective cutting length is smaller than the maximum cutting length, the temporary defective cutting length is When the defective cutting length is assumed to be larger than the maximum cutting length, the defective cutting length and the number of defective cutting are determined by repeating the procedure by sequentially increasing the number of defective cutting one by one. It is characterized by calculating.

  As described above, the defective cutting length calculation unit calculates the temporary defective cutting length by dividing the defective portion length by the number of defective cutting as one, and the temporary defective cutting length is smaller than the minimum cutting length. If the minimum cutting length is the defective cutting length and the temporary defective cutting length is less than the maximum cutting length, the temporary defective cutting length is the defective cutting length and the temporary defective cutting length is greater than the maximum cutting length. Since the defective cutting length and the number of defective cutting are calculated by increasing the number of defective cutting one by one and repeating the above procedure, the optimum defective cutting length and the number of defective cutting can be surely calculated.

  A production management device according to the present invention is a production management device that controls the operation of a corrugating machine including a cut-off device that cuts cardboard that is continuously conveyed into a cardboard sheet by cutting the cardboard in a direction substantially perpendicular to the conveyance direction. The maximum cutting length setting part that can be set to change the maximum cutting length at the time of cutting the defective part, the minimum cutting length setting part that can be set to change the minimum cutting length at the time of cutting the defective part, and the defective part that exists in the cardboard A defective cutting length calculation unit that calculates a defective cutting length and the number of defective cuttings positioned between the maximum cutting length and the minimum cutting length according to the length is provided.

In this way, the defective cutting length calculation unit calculates the defective cutting length and the number of defective cuttings positioned between the set maximum cutting length and the minimum cutting length in accordance with the defective portion length existing in the cardboard. By controlling the cutting length of the cut-off device according to the defective cutting length and the number of defective cutting, the defective corrugated cardboard sheet can be cut in accordance with the defective portion.
Therefore, the defective corrugated sheet hardly includes a good portion that becomes a product, so that the product loss can be greatly reduced.
Further, if the set value of the maximum cutting length in the maximum cutting length setting unit is increased, the number of defective corrugated cardboard sheets can be reduced.
In consideration of ease of handling, it is preferable to limit the maximum cutting length to a length that allows the defective cardboard sheet to be discharged well.

Furthermore, since the length of the defective cardboard sheet is always longer than the minimum cutting length, if the set value of the minimum cutting length in the minimum cutting length setting portion is increased, a long defective cardboard sheet can be obtained, For example, it can be effectively used as a laying paper for protecting the cardboard sheet bundle when the cardboard sheet bundle is placed or conveyed.
If the maximum cut length and the minimum cut length are set to the same length, the defective corrugated cardboard sheet is subjected to so-called fixed length removal in which the cardboard sheet is cut at a constant length.
In this way, it is possible to handle both operations that can significantly reduce product loss, operations that simplify the processing of defective corrugated cardboard sheets, and operations that can effectively use defective corrugated cardboard sheets. Can do.

  Further, in the production management device according to the present invention, the defective cutting length calculation unit calculates the temporary defective cutting length by dividing the defective portion length by the number of defective cutting as one, When the temporary defective cutting length is smaller than the minimum cutting length, the minimum cutting length is the defective cutting length, and when the temporary defective cutting length is smaller than the maximum cutting length, the temporary defective cutting length. Is the defective cutting length, and the temporary defective cutting length is larger than the maximum cutting length, the defective cutting length and the defective cutting number of sheets are increased by sequentially increasing the number of defective cuttings one by one and repeating the procedure. Is calculated.

  As described above, the defective cutting length calculation unit calculates the temporary defective cutting length by dividing the defective portion length by the number of defective cutting as one, and the temporary defective cutting length is smaller than the minimum cutting length. If the minimum cutting length is the defective cutting length and the temporary defective cutting length is less than the maximum cutting length, the temporary defective cutting length is the defective cutting length and the temporary defective cutting length is greater than the maximum cutting length. Since the defective cutting length and the number of defective cutting are calculated by increasing the number of defective cutting one by one and repeating the above procedure, the optimum defective cutting length and the number of defective cutting can be surely calculated.

According to the present invention, the defective cutting length calculation unit calculates the defective cutting length and the number of defective cuttings positioned between the set maximum cutting length and the minimum cutting length in accordance with the defective portion length existing in the cardboard. Therefore, product loss can be greatly reduced.
Further, if the set value of the maximum cutting length in the maximum cutting length setting unit is increased, the number of defective corrugated cardboard sheets can be reduced.
Furthermore, since the length of the defective cardboard sheet is always longer than the minimum cutting length, if the set value of the minimum cutting length in the minimum cutting length setting portion is increased, a long defective cardboard sheet can be obtained, It can be used effectively as laying paper.
In this way, it is possible to handle both operations that can significantly reduce product loss, operations that simplify the processing of defective corrugated cardboard sheets, and operations that can effectively use defective corrugated cardboard sheets. Can do.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
In this embodiment, the present invention is applied to a corrugating machine 1 for producing double-sided cardboard sheets for producing double-sided cardboard sheets.
FIG. 1 is a schematic configuration diagram showing a corrugating machine 1.
The corrugating machine 1 includes a mill roll stand 3, a single facer 5, a bridge unit 7, a glue machine 9, a double facer 11, a rotary shear 13, a slitter scorer 15, a cut-off 17, and a stacker 19. A production management device 21 is provided.
These devices are installed on the same floor surface FL.

The mill roll stand 3 is configured such that roll papers 23 each having a base paper wound in a roll shape are mounted on both sides in the front-rear direction.
On the upper part of the mill roll stand 3, a splicer 25 for performing paper splicing is provided.
When paper is fed from one paper roll 23, the other paper roll 23 is mounted and paper splicing preparation is made. When the remaining base paper on one paper roll 23 is reduced, the splicer 25 joins the base paper on the other paper roll 23. Then, while the base paper is being supplied from the other paper roll 23, one of the paper rolls 23 is mounted to prepare for paper splicing.
In this way, the base paper is sequentially spliced and continuously fed out from the mill roll stand 3 toward the downstream side.

Each base paper is called a back liner, a core, and a front liner depending on the application.
The mill roll stand 3 includes a back liner mill roll stand 3a, a center core mill load stand 3b, and a front liner mill load stand 3c according to the purpose of the paper to be supplied.
The back liner mill roll stand 3 a supplies the back liner 27 to the single facer 5.
The center core mill load stand 3 b supplies a center core 29 that is stepped to the single facer 5.
The front liner mill roll stand 3 c supplies the front liner 31 to the double facer 11.

The single facer 5 is provided with an upper roll 33, a lower roll 35, a gluing device 37, and a pressure belt 39.
Concave portions and convex portions extending in the axial direction are alternately formed on the peripheral surfaces of the upper roll 33 and the lower roll 35.
The upper roll 33 and the lower roll 35 are installed so that the concave portions and the convex portions thereof mesh with each other, and the middle core 29 supplied between the two from the middle mill load stand 3b at both meshing portions. It is comprised so that it may process in a wavy shape.

The gluing device 37 is installed on the peripheral surface of the upper roll 33 on the downstream side in the rotation direction of the meshing portion of the upper roll 33 and the lower roll 35, and has a function of gluing the top of the core 29.
The pressure belt 39 is installed above the upper roll 33 and is provided so as to be in contact with and away from the upper roll 33.
The pressure belt 39 presses the back liner 27 supplied from the back liner mill roll stand 3 a against the wave-processed core 29 carried along the peripheral surface of the upper roll 33, and bonds them to a single-sided cardboard. 41 is formed.
The single-sided cardboard 41 has a shape in which stepped ridges 42 (see FIG. 2) extending in the width direction are arranged in parallel in the transport direction on one side of the back liner 25.

A take-up conveyor 43 is installed obliquely above the single facer 5 on the downstream side in the conveying direction. The take-up conveyor 43 is composed of a pair of endless belts and has a function of sandwiching the single-sided cardboard 41 formed in the single facer 5 and transporting it to the bridge unit 7.
The bridge portion 7 temporarily retains the single-sided cardboard 41 in order to absorb the speed difference between the single facer 5 and the devices following the double facer 11.
The glue machine 9 is interposed between the bridge portion 7 and the duffel facer 11, and is provided with a gluing device 45 that glues the top of the corrugated mountain 42 of the single-sided cardboard 41.

The double facer 11 forms a double-sided cardboard 47 by bonding a single-sided cardboard 41 and a front liner 31 together.
The double facer 11 includes a hot plate 49, a weight roll 51, an upper conveyor 53, and a lower conveyor 55.
The hot plate 49 is a metal hollow box, and the upper surface is maintained at a high temperature by an internal heating source.
A plurality of the hot plates 49 are juxtaposed in the conveying direction of the double-sided cardboard 47, and their upper surfaces are configured to guide and heat the lower surface of the double-sided cardboard 47.

The weight roll 51 is installed above the hot plate 49 so that the axis is orthogonal to the transport direction.
A plurality of weight rolls 51 are juxtaposed in the conveying direction of the double-sided cardboard 47 and presses the double-sided cardboard 47 toward the hot plate 49 from above.
The upper conveyor 53 and the lower conveyor 55 convey the double-sided cardboard 47 from above and below.

The rotary 13 is installed on the downstream side of the double facer 11 and cuts the double-sided cardboard 47 in the width direction in full width or partially.
The rotary shaft 13 includes, for example, a knife cylinder 57 and an anvil cylinder 59 that are arranged opposite to each other with their axes extending in the width direction.
The peripheral surface of the knife cylinder 57 is provided with a knife extending in the width direction.
The anvil cylinder 59 receives the knife of the knife cylinder 57. For example, the receiving part of the knife is divided in the axial direction so that a portion required for cutting can be selectively engaged with the knife. .

The slitter scorer 15 cuts a wide double-sided cardboard 47 so as to have a predetermined width in the transport direction, and processes a ruled line extending in the transport direction.
The slitter scorer 15 includes a first slitter scorer unit 15a and a second slitter scorer unit 15b arranged along the conveying direction of the double-sided cardboard 47.
Since the first slitter scorer unit 15a and the second slitter scorer unit 15b are configured similarly, the same members are distinguished by adding suffixes “a” and “b” after the reference numerals. In the following description, when distinguishing the first slitter scorer unit 15a and the second slitter scorer unit 15b, a and b are added after the reference, but a and b are omitted unless otherwise distinguished. And each part and member shall be shown only by a code.

.
One of the first slitter scorer unit 15a and the second slitter scorer unit 15b is in operation, and the other is configured to perform preparatory work such as setting change for order change. FIG. 1 shows a state in which the second slitter scorer unit 15b is operating.
In the first slitter scorer unit 15a and the second slitter scorer unit 15b, a plurality of sets of upper ruled line rolls 61 and lower ruled line rolls 63 arranged opposite to each other with the double-sided cardboard 47 interposed therebetween on the upstream side in the conveying direction are set in the width direction. Is provided. The upper ruled line roll 61 and the lower ruled line roll 63 are configured to be movable in the width direction and the vertical direction, respectively.

A convex portion that is continuous in the circumferential direction is formed at a substantially central portion of the circumferential surface of the upper ruled line roll 61. A concave portion that is continuous in the circumferential direction is formed at a substantially central portion of the circumferential surface of the lower ruled line roll 9.
On the downstream side of the upper ruled line roll 61 and the lower ruled line roll 63, a plurality of sets of upper slitter knives 65 and lower slitter knives 67 that are arranged to face each other with the double-sided cardboard 47 interposed therebetween are provided in the width direction. The upper slitter knife 65 and the lower slitter knife 67 are movable in the width direction and the vertical direction, respectively.
The upper slitter knife 65 and the lower slitter knife 67 are each a disc-shaped blade having a sharp outer periphery, and is configured to be rotated at a high speed.

The cut-off device 17 cuts the double-sided cardboard 47 cut in the transport direction by the slitter scorer 15 in the width direction to form a plate-like cardboard sheet 71.
The cut-off device 17 is provided with an upper knife cylinder 68 and a lower knife cylinder 69 which are arranged to face each other with the double-sided cardboard 47 interposed therebetween and are rotated in opposite directions.
A knife 70 extending in the width direction is provided on the peripheral surface of the upper knife cylinder 68, and a knife 72 extending in the width direction is provided on the peripheral surface of the lower knife cylinder 69. (See Figure 2)
When the upper knife cylinder 68 and the lower knife cylinder 69 are rotated and the knives 70 and 72 are engaged with each other, the double-sided cardboard 47 is configured to be cut in the width direction.

On the downstream side of the cut-off device 17, it swings in the vertical direction with the downstream side as a fulcrum, protrudes to the conveyance path of the corrugated cardboard sheet 71 when moving upward, and, for example, a conveyance path switching member 75 that guides the defective cardboard sheet 77 downward. Is provided.
Below the transport path switching member 75, a box 79 for storing the defective cardboard sheet 77 is installed.
The stacker 19 stacks the corrugated cardboard sheets 71 conveyed by the conveyance conveyor 73 and discharges them as products to the outside of the machine.

The production management device 21 controls each part of the corrugating machine 1 in order to perform production quantity management for producing the production quantity according to the order, order change corresponding to the order change, and quality management.
Various parts of the corrugating machine 1 are provided with various sensors in order to provide the production management apparatus 21 with information such as production status.

The production management device 21 is provided with a cut-off length control unit 81.
The cut-off length control unit 81 includes a defect length calculation unit 83, a defect cut length calculation unit 85, a maximum cut length setting unit 87, a minimum cut length setting unit 89, a cut length control unit 91, and a product cut. A length setting unit 93 is provided.
The defect length calculation unit 83 receives the defect portion detection information from the defect detection unit 95 and calculates a defect portion length Lw (length of the defect portion) according to the defect content.

The maximum cutting length setting unit 87 sets a maximum cutting length Lmax at the time of cutting a defective part, and this maximum cutting length Lmax can be set to an arbitrary value.
The minimum cutting length setting unit 89 can set a minimum cutting length Lmin at the time of cutting a defective portion, and this minimum cutting length Lmin is set to an arbitrary value longer than the cutting limit dimension of the cutoff device 17.
The defective cutting length calculation unit 85 introduces the defective part length Lw from the defective length calculation unit 83, the maximum cutting length Lmax from the maximum cutting length setting unit 87, and the minimum cutting length Lmin from the minimum cutting length setting unit 89. The defective cutting length Lwo and the number Nw of defective cutting are calculated.

The product cutting length setting unit 93 obtains the length of the corrugated cardboard sheet 71 as the product of each order from the production order setting unit 97, and sets the product cutting length Ls in the cutoff device 17.
The cut-off length control unit 91 controls the cut length of the cut-off device 17. The cut-off length control unit 91 controls the rotation of the upper knife cylinder 68 and the lower knife cylinder 69 of the cut-off device 17 so that the cut along the product cut length Ls introduced from the product cut length setting unit 93 is normally performed. To do.
When the defective portion reaches the cutoff device 17, the cutoff length control unit 91 controls the operation of the cutoff device 17 based on the defective cutting length Lwo and the defective cutting number Nw introduced from the defective cutting length calculation unit 85. Is configured to do.

The operation of the corrugating machine 1 according to this embodiment described above will be described.
First, the manufacturing operation of the cardboard sheet 71 will be described with reference to FIG.
The center core 29 is supplied between the upper roll 33 and the lower roll 35 of the single facer 5 from the mill roll stand 3b for the center core.
The back liner 27 is supplied from the back liner mill roll stand 3 a between the upper roll 33 and the pressure belt 39.
The supplied core 29 is stepped into a wave shape at the meshing portion between the upper roll 33 and the lower roll 35.
The corrugated core 29 is glued to the top of the step by the gluing device 37 while being conveyed along the peripheral surface of the upper roll 33.

When the center core 29 conveyed in this state reaches the engaging portion with the pressure belt 39, the pressure belt 39 presses the back liner 27 toward the center core 29, and the step top portion of the center core 29 and the back liner 27 are pressed. Are laminated to form a single-sided cardboard 41.
The single-sided cardboard 41 formed in this way is picked up by the pick-up conveyor 43 and conveyed to the bridge unit 7.
The single-sided cardboard 41 is conveyed from the bridge portion 7 to the double facer 11, but since the conveyance speed to the doublefacer is lower than the conveyance speed from the single facer 5, the single-sided cardboard 41 forms a plurality of curved shapes in the bridge portion 7. Will stay.
While the single-sided cardboard 41 stays in the bridge portion 7, the glue sufficiently permeates the back liner 27 and the center core 29 and further dries, so that the single-sided cardboard 41 is firmly bonded.

The single-sided cardboard 41 supplied from the bridge unit 7 to the double facer 11 is glued to the top of the step by the gluing device 45 of the glue machine 9.
The glued single-sided cardboard 41 is bonded to the front liner 31 supplied from the front liner mill roll stand 3 c and introduced into the double facer 11.

The single-sided corrugated board 41 and the front liner 31 introduced into the double facer 11 are joined via glue attached to the step top of the core 29 and are pressed against the hot plate 49 by the weight rolls 51. It runs while sliding on 49.
At this time, the front liner 31 in contact with the hot plate 49 is heated by receiving heat from the hot plate 49, and the glue between the single-sided cardboard 41 and the front liner 31 is dried and solidified to form the double-sided cardboard 47.
Even if the double-sided cardboard 47 passes through the hot plate 49, it is sandwiched and conveyed by the upper conveyor 53 and the lower conveyor 55 for a while, and is cooled during this time.

The double-sided cardboard 47 carried out from the double facer 11 is introduced into the slitter scorer 15.
The double-sided corrugated cardboard 47 is processed with a ruled line for easy folding by an upper ruled line roll 61b and a lower ruled line roll 63b in the second slitter scorer unit 15b along the conveying direction, and then conveyed by an upper slitter knife 65b and a lower slitter knife 67b. Cut along the direction.
At this time, the first slitter scorer unit 15a is set in a standby state according to an instruction from the production management device 21, and the width direction positions of the upper ruled line roll 61a and the lower ruled line roll 63a, the upper slitter knife 65a, and the lower slitter knife 67a are in the next order. We are preparing to change orders such as moving to a processing position.

The double-sided cardboard 47 that has passed through the slitter scorer 15 is such that the upper knife cylinder 68 and the lower knife cylinder 69 of the cutoff device 17 have the product cutting length Ls set by the product cutting length setting unit 93 by the cutoff length control unit 91. The sheet is cut in the width direction by being rotated at a rotation speed controlled to be a cardboard sheet 71 having a product cutting length Ls.
The cardboard sheets 71 are transported by the transport conveyor 73, stacked on the stacker 19, and discharged outside the apparatus.

Next, the defect removal operation in the cutoff device 17 will be described.
The cut-off control unit 81 calculates a defective cutting length Lwo and the number of defective cuttings for removing this defective portion.
This calculation method will be described with reference to FIG.
The maximum cutting length Lmax is set in the maximum cutting length setting unit 87. The maximum cutting length Lmax is set to 1500 mm, for example.
The minimum cutting length Lmin is set in the minimum cutting length setting unit 89. The minimum cutting length Lmin is set to 700 mm, for example.

First, the occurrence of a defective part is detected by the defect detection unit 95 (step S1).
Examples of the defective portion include a paper splicing portion at the time of paper replacement and insufficient paper splicing, an overlapping portion at the time of changing the order of the slitter scorer 15, and the like.
The missing paper splicing part is detected by a detector (not shown) installed at a predetermined position because it is provided with a mark M such as aluminum.
Further, the occurrence of the overlapping portion at the time of changing the order of the paper splicing portion and the slitter scorer 15 at the time of changing the paper is detected from the control information of the production management device 21.

The defect length calculation unit 83 receives the defect occurrence information from the defect detection unit 95 and calculates the defect part length Lw as follows (step 2).
In the case of paper replacement, the length from the most downstream side of the base paper to the upstreammost side of the base paper and the part that has a predetermined length added upstream and downstream of this part is defined as a defective part. The length from the final cutting position Cl of the current order in the cutoff device 17 to the uppermost stream side position of the defective portion is calculated as the defective portion length Lw.
In the case of insufficient paper splicing, for example, a mark M such as an aluminum piece attached to the splicing portion is detected, a predetermined length on the upstream side and downstream side of the portion is defined as a defective portion, and the downstream side of the detection position is detected. The length from the planned cutting position C to the most upstream position of the defective portion is calculated as the defective portion length Lw. (See Figure 5)

In the case of slitter change, the cutting overlap portion of the old and new orders when the upper slitter knife 61 and the lower slitter knife 63 are moved up and down due to the order change becomes a defective portion. This is due to the conveyance speed of the double-sided cardboard 47 and the upper slitter knife 61 and lower The length from the final cutting position Cl of the current order to the most upstream position of the defective portion is calculated as the defective portion length Lw. (See Figure 8)
In the case of paper change and order change by the slitter scorer 15, since the production amount is controlled by the production management device 21, the positional relationship with the final cutting position Cl of the current order is known.

Next, the defective cutting length calculation unit 85 temporarily sets the defective cutting number Nw as 1 (step S3).
Then, the defective part length Lw (for example, 2400 mm) introduced from the defective length calculation unit 83 is divided by the number Nw of defective cutting to calculate a temporary defective cutting length Lwo (Lw / Nw, for example 2400 mm). It is determined whether the defective cutting length Lwo is smaller than the minimum cutting length Lmin (step S4).
If the provisional defective cutting length Lwo is smaller than the minimum cutting length Lmin (YES), the minimum cutting length Lmin is set as the defective cutting length Lwo (step S5). The minimum cutting length Lmin is set as the defective cutting length Lwo, and the number of defective cutting sheets Nw is set to one, which is a temporary defective cutting number (step S7).

If the temporary defective cutting length Lwo is larger than the minimum cutting length Lmin (YES), it is determined whether the temporary defective cutting length Lwo is larger than the maximum cutting length Lmax (step S6).
When the temporary defective cutting length Lwo is smaller than the maximum cutting length Lmax (NO), the temporary defective cutting length Lwo is set as the defective cutting length Lwo, and one temporary defective number is set as the defective cutting number Nw. (Step S7).
When the temporary defective cutting length Lwo corresponding to the illustrated case is larger than the maximum cutting length Lmax (YES), the temporary defective cutting number Nw is increased by one (step 8).

Thereafter, Step 4 to Step 8 are repeated until the defective cutting length Lwo and the number of defective cutting sheets Nw can be set in Step 7.
In the illustrated case, when the temporary cutting number Nw is 2 in step 8, the temporary defective cutting length Lwo (Lw / Nw) is 1200 mm.
In Step 4, since the temporary defective cutting length Lwo is larger than the minimum cutting length Lmin, the process proceeds to Step 5.
In step 5, since the temporary defective cutting length Lwo is larger than the maximum cutting length Lmax, in step 7, the defective cutting length Lwo is set to 1200 mm, and the defective cutting number Nw is set to two.

In this way, the defective cutting length Lwo and the defective cutting number Nw calculated by the defective cutting length calculation unit 85 are transmitted to the cutoff length control unit 91.
The cut-off length control unit 91 controls the rotational speeds of the upper knife cylinder 68 and the lower knife cylinder 69 to be cut with the defective cutting length Lwo at the timing when the defective portion reaches the cutoff device 17.
Thus, in the illustrated case, the defective portion length Lw is all included in the two defective corrugated cardboard sheets 75, and the defective cardboard sheet 75 does not include a product portion.
The defective corrugated cardboard sheet 77 cut by the cut-off device 17 is guided downward by the conveyance path switching member 75 swinging upward at the timing, and is accumulated in the box 79.

6 and 7 show a cutting state of the defective corrugated cardboard sheet 75 in the shortage sheet joining.
FIG. 6 shows a case where the product cutting length Ls is long. In the case of the former, product loss occurs in the case of cutting length removal cut by the product cutting length Ls and fixed length removal cutting by the fixed cutting length Lp. Product loss increases.
FIG. 7 shows a case in which the product cutting length Ls is short and slightly shorter than the defective part length Lw. In this case as well, the cutting length is removed with the product cutting length Ls and the fixing is performed with the fixed cutting length Lp. In the case of long removal, there is a product loss.
Further, in this case, the removal cutting length Lt becomes the cutting limit size of the cutoff device 17, so that a product loss occurs in the one shown in Patent Document 1.
The defective cutting length Lwo of the present embodiment matches the defective part length Lw in either case.

9 and 10 show a cutting state of the defective corrugated cardboard sheet 75 in the slitter change.
FIG. 9 shows the case where the conveyance speed of the double-sided cardboard 47 is low and the defective portion length Lw is short. In the case of cutting length removal cut by the product cutting length Ls and fixed length removal cutting by the fixed cutting length Lp. Product loss has come out.
FIG. 10 shows a case where the conveyance speed of the double-sided cardboard 47 is fast, the defective part length Lw is long, and the defective part length Lw is longer than the product cutting length Ls. In the case of cutting length removal to be performed and fixed length removal to be cut at the fixed cutting length Lp, a product loss has occurred.
Further, in this case, the removal cutting length Lt (shown in Patent Document 1) becomes the cutting limit size of the cut-off device 17, so that a product loss occurs.
Moreover, in both cases, the number of defective cuts is two.
In either case, the defective cutting length Lwo of the present embodiment coincides with the defective part length Lw, and the number Nw of defective cutting is within one.

In the corrugating machine 1 according to the present embodiment, the defective cutting length calculation unit 85 is positioned between the set maximum cutting length Lmax and the minimum cutting length Lmin according to the defective portion length Lw present on the double-sided cardboard 47. Since the defective cutting length Lwo and the defective cutting number Nw are calculated, the cutting of the defective corrugated cardboard sheet 75 in accordance with the defective portion is performed by controlling the cutting length of the cutoff device 17 based on the defective cutting length Lwo and the defective cutting number Nw. Can be done.
Therefore, since the defective corrugated cardboard sheet 75 hardly includes a good portion that becomes a product, the product loss can be greatly reduced.

In the illustrated case, if the maximum cutting length Lmax is set to 2450 mm, for example, the number of defective cuts can be one.
Thus, if the set value of the maximum cutting length Lmax in the maximum cutting length setting unit 87 is increased, the number of defective cuts Nw of the defective corrugated cardboard sheet 75 can be reduced.
When the maximum cutting length Lmax is increased, the length of the defective corrugated cardboard sheet 75 may be increased. If the length of the defective cardboard sheet 75 increases, the defective cardboard sheet 75 cannot fit in the box 79 at the time of discharge, and may hinder the flow of the product. Therefore, the maximum cutting length Lmax is set to a length that allows the defective cardboard sheet 75 to be discharged properly. It is preferred to limit.

Further, since the length of the defective cardboard sheet 75 is always longer than the minimum cutting length Lmin, if the set value of the minimum cutting length Lmin in the minimum cutting length setting unit 89 is increased, the defective cardboard sheet 75 having a long length is reduced. For example, it can be effectively used as a laying paper for protecting the bundle of cardboard sheets 71 when the bundle of cardboard sheets 71 is placed or transported.
If the maximum cutting length Lmax and the minimum cutting length Lmin are set to the same length, the defective corrugated cardboard sheet 75 performs so-called fixed (preset) length removal in which the defective corrugated cardboard sheet 75 is cut at a constant length.
As described above, the corrugating machine 1 according to the present embodiment is compatible with any of the operation that can significantly reduce the product loss, the operation that simplifies the processing of the defective cardboard sheet 75, and the operation that can effectively use the defective cardboard sheet 75. Since it can, it can respond to various needs of users.

  In addition, although this embodiment demonstrated the corrugated machine 1 which manufactures a double-sided cardboard sheet, this invention is applicable to the other corrugated machine 1, for example, the corrugated machine 1 which manufactures a double-sided cardboard sheet.

1 is a front view showing an overall schematic configuration of a corrugating machine according to an embodiment of the present invention. It is a front view which shows the condition in the cut-off apparatus 17 part concerning one Embodiment of this invention. It is a block diagram which shows schematic structure of the production management apparatus concerning one Embodiment of this invention. It is a flowchart which shows the defective cutting length calculation method concerning one Embodiment of this invention. It is sectional drawing which shows the insufficient paper splicing part concerning one Embodiment of this invention. It is a top view which shows the cutting condition of the insufficient paper splicing part concerning one Embodiment of this invention. It is a top view which shows the cutting condition of the insufficient paper splicing part concerning one Embodiment of this invention. It is a top view which shows the processing condition at the time of order change in the slitter scorer concerning one Embodiment of this invention. It is a top view which shows the cutting condition of the slitter change part concerning one Embodiment of this invention. It is a top view which shows the cutting condition of the slitter change part concerning one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Corrugating machine 17 Cut-off apparatus 21 Production management apparatus 71 Corrugated cardboard sheet 81 Cut-off length control part 85 Defective cutting length calculation part 87 Maximum cutting length setting part 89 Minimum cutting length setting part Lwo Defective cutting length Nw Defective cutting number

Claims (4)

A cut-off device that cuts cardboard that is continuously conveyed into a cardboard sheet by cutting it in a direction substantially perpendicular to the conveyance direction;
A corrugating machine comprising at least a cut-off length control unit for controlling the cut-off length of the cut-off device, and a production management device for controlling the operation of the entire device,
In the cut-off length control unit, a maximum cutting length setting unit that can be set to change the maximum cutting length at the time of defective part cutting,
A minimum cutting length setting section that can be set to change the minimum cutting length at the time of cutting a defective part,
A defective cutting length calculation unit that calculates a defective cutting length and a number of defective cuttings positioned between the maximum cutting length and the minimum cutting length in accordance with a defective part length existing in the cardboard is provided. And corrugating machine. The defective cutting length calculation unit
Dividing the defective portion length by the number of defective cuts as 1, and calculating the temporary defective cut length,
If the temporary defective cutting length is smaller than the minimum cutting length, the minimum cutting length is the defective cutting length,
If the temporary defective cutting length is smaller than the maximum cutting length, the temporary defective cutting length is the defective cutting length,
If the temporary defective cutting length is larger than the maximum cutting length, the defective cutting length and the number of defective cutting are calculated by repeating the procedure by sequentially increasing the number of defective cutting one by one. The corrugating machine according to claim 1. A production management device that controls the operation of a corrugating machine including a cut-off device that cuts cardboard that is continuously conveyed in a direction substantially perpendicular to the conveyance direction into a cardboard sheet,
Maximum cutting length setting part that can be set to change the maximum cutting length at the time of defective part cutting,
A minimum cutting length setting section that can be set to change the minimum cutting length at the time of cutting a defective part,
A defective cutting length calculation unit that calculates a defective cutting length and a number of defective cuttings positioned between the maximum cutting length and the minimum cutting length according to the defective portion length existing in the cardboard is provided. Production management device characterized by The defective cutting length calculation unit
Dividing the defective portion length by the number of defective cuts as 1, and calculating the temporary defective cut length,
If the temporary defective cutting length is smaller than the minimum cutting length, the minimum cutting length is the defective cutting length,
If the temporary defective cutting length is smaller than the maximum cutting length, the temporary defective cutting length is the defective cutting length,
If the temporary defective cutting length is larger than the maximum cutting length, the defective cutting length and the number of defective cutting are calculated by repeating the procedure by sequentially increasing the number of defective cutting one by one. The production management device according to claim 3.

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