JP2007152689A - Corrugating machine and production control device used therein - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control operation by accurately detecting the length of the single-faced corrugated cardboard stagnated in a bridge part. <P>SOLUTION: This corrugating machine has a single facer, the bridge part 7, a double facer 11, a treatment device and a stagnation length calculation part 83 and is equipped with a production control device 21 for controlling the operation of the whole of the corrugation machine. The stagnation length calculation part 83 is equipped with a number-of-corrugation calculation part 93 for calculating the number of the corrugations of the single-faced corrugated cardboard stagnated in the bridge part 7 using an inlet corrugation sensor 75, which detects the corrugations of the single-faced corrugated cardboard entering the bridge part 7, and an outlet corrugation sensor 77 for detecting the corrugations of the single-faced corrugated cardboard issued from the bridge part 7, a corrugation pitch calculation part 95 for dividing feed distance of the double-faced corrugated cardboard in the vicinity of the treatment device by a predetermined number during the period when the predetermined number of corrugations is detected by the outlet corrugation sensor 77 to calculate a corrugation pitch and a stagnation length arithmatic part 97 for magnifying the number of corrugation by the corrugation pitch to operate the stagnation length of the single-faced corrugated cardboard. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

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

The corrugating machine includes at least a single facer that forms a single-sided cardboard and a double facer that forms a double-sided cardboard by bonding a front liner paper to the single-sided cardboard.
In a single facer, a core supplied from a mill roll stand is processed into a corrugated shape, and a back liner supplied from another mill roll stand is bonded to form a single-sided cardboard.
The single-sided cardboard formed by the single facer is sent to the bridge portion provided on the downstream side, and is stored there and sent to the downstream double facer according to its speed.
In the double facer, a double-sided cardboard is formed by laminating a front liner sent from a mill roll stand separately provided on a single-sided cardboard sent from the bridge portion.

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.
Two roll papers can be mounted on each mill roll stand, and cardboard sheets are continuously produced by splicing from one roll paper to the other 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 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.

The corrugating machine is a long facility including various processes from a mill roll stand to a cut-off device, and the timing of order change in each process is naturally different.
For example, when performing paper splicing for the next order in the mill roll stand, the length of the single-sided cardboard, double-sided cardboard, etc. existing from the mill roll stand to the cut-off device is the remaining production length of the current order or the number of remaining production Must be able to secure
For this reason, in order to ensure the number of sheets produced on the order and not to increase the number of sheets produced, it is possible to accurately and reliably grasp the length of single-sided cardboard, double-sided cardboard, etc. existing in the middle of the corrugating machine. Desired.

The length of single-sided cardboard, double-sided cardboard, etc. existing in the corrugating machine can be immediately determined from the equipment dimensions of the corrugating machine, except for those staying in the bridge part. For this reason, conventionally, various methods have been implemented and proposed as described in Patent Document 1, for example, in order to measure this.
In Patent Document 1, in the conventional method 1 in which the number of steps of single-sided corrugated cardboard staying in the bridge portion is detected and the staying length is calculated by multiplying the reference pitch of one pile, the actual pitch always changes. A corresponding error occurs. Further, in the conventional method 2 for calculating the staying length by counting the entering / exiting of the measuring roller that contacts the back liner and the measuring roller that contacts the double-sided cardboard, the error due to thermal expansion or slip increases as the running length increases. Cause a considerable error.

The invention disclosed in Patent Document 1 detects the number of steps of single-sided corrugated cardboard staying in the bridge portion in the same manner as in the conventional method 1, and the number of rollers corresponding to the amount of rotation of the roller rotated in contact with the back liner. A length calculation pulse generator for generating a length calculation pulse having a relatively small pulse pitch is provided. Then, the length calculation pulse generated for each stagnant step is stored, and the number of length calculation pulses corresponding to the total number of single-sided corrugated cardboard staying in the bridge portion is calculated. It is multiplied by the pitch of the length calculation pulse.
Thereby, since the length calculation pulse generated for each step is stored, the rotation amount of the calculation pulse generator for each time is reduced. For this reason, since the accumulation of errors in the calculation pulse generator is reduced, the measurement accuracy is improved.

JP 7-47622 A

However, in the invention shown in Patent Document 1, the movement amount of the back liner supplied to the single facer is measured to calculate the stepped pitch from the single facer. This back liner is a single facer. When being bonded to the center core, moisture is given by glue or the like, and further subjected to processing such as drying at the bridge portion, so that deformation occurs due to the length of the double-sided cardboard as a product.
Moreover, since the corrugated pitch of the single-sided cardboard fed out from the single facer changes at the bridge portion, an error occurs with the length of the double-sided cardboard as a product.
Furthermore, the length calculating pulse generator measures the amount of movement of the back liner corresponding to the stepped pitch. The step pitch is about 8.5 mm for the A flute and about 6 mm for the B flute. It is a real problem and difficult to accurately measure this short distance with a back liner that moves at high speed while vibrating.
Therefore, the invention disclosed in Patent Document 1 has a problem that it is difficult to calculate the length of the single-sided cardboard staying in the bridge portion with sufficient accuracy.

  In view of the above problems, an object of the present invention is to provide a production management device capable of accurately detecting the length of a single-sided cardboard staying in a bridge portion and controlling the operation accordingly, 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 stores at least one single facer for manufacturing a single-sided cardboard by bonding a back liner to a stepped core, and stores the single-sided cardboard from the single facer. A bridge part to be supplied to the next process, a double facer for producing at least a double-faced cardboard by bonding a front liner to the core side of the single-sided cardboard supplied from the bridge part, and the double-faced cardboard conveyed from the double facer Corrugating machine comprising: a processing device that cuts a cardboard sheet into a corrugated cardboard sheet; and a production management device that has at least a staying length calculating section that calculates the staying length of single-sided corrugated cardboard that stays in the bridge portion and controls the operation of the entire device The stay length calculation unit includes an inlet stage that detects a step of a single-sided cardboard entering the bridge part. A step number calculating unit for calculating the number of steps of the single-sided cardboard staying in the bridge unit using an sensor and an exit stepping sensor for detecting a stepped mountain of the single-sided cardboard coming out of the bridge unit; and A stepped pitch calculation unit that detects a distance by which the double-sided cardboard is transported in the vicinity of the processing device while detecting a predetermined number of steps and divides the distance by the predetermined number to calculate the stepped pitch. And a stay length calculator that calculates the stay length by multiplying the number of steps calculated by the step number calculator by the step pitch calculated by the step pitch calculator. It is characterized by.

According to the present invention, in the step number calculation unit, for example, every time a predetermined point of a single-sided cardboard passes through the entrance step sensor, the increment is counted every time the entrance step sensor detects the step. Further, the entrance mountain sensor may count, for example, the number of cores that are stepped or the number corresponding thereto.
For example, from the point when a predetermined point on the single-sided cardboard passes through the exit step sensor, the count is incremented every time the entrance step sensor detects the step, and subtracted every time the exit step sensor detects the step. .
In addition, the addition count start timing of the inlet step sensor is at an arbitrary position until the single-sided cardboard reaches the bridge portion, and the subtraction count start timing of the exit step sensor is an arbitrary position between the bridge portion and the double facer. Can be set to position.
As a result, the number of steps of the single-sided cardboard that is between the entrance step sensor and the exit step sensor at any time, that is, stays in the bridge portion, is accurately calculated.
The step pitch calculator detects the distance that the double-sided cardboard is transported in the vicinity of the processing apparatus while the exit step sensor detects a predetermined number of steps, and divides this distance by the predetermined number. Calculate the mountain pitch.
The staying length calculation unit calculates the staying length of the single-sided cardboard that stays in the bridge portion by multiplying the calculated step number by the step pitch.

As described above, since the distance at which the double-sided cardboard is transported in the vicinity of the processing apparatus is used to calculate the corrugated pitch, the length of the product itself is used.
In addition, since the distance through which the predetermined number of terraces passes is detected, the detected distance has a certain length, and the detection can be performed with high accuracy.
Furthermore, since the double-sided cardboard has a high strength and is stably conveyed, it can be detected with higher accuracy than the detection with the back liner.
The predetermined number is preferably several tens to several hundreds from the viewpoints of detection accuracy, influence of accumulated error, detection timing, and the like.
Also, since the stepped pitch is calculated for the single-sided corrugated cardboard at the location where the exit corrugated sensor is installed, i.e., where it exits from the bridge, the single-sided cardboard drying process is almost completed, It will be calculated in a portion with less fluctuation.
As a result, the staying length of the single-sided cardboard staying in the bridge portion can be accurately calculated.

When the stay length is accurately determined, the total length of the sheets existing in the corrugating machine is accurately determined. Therefore, the control operation controlled based on this, for example, the paper splicing timing can be accurately performed. .
When the paper splicing timing is accurate, it is possible to improve the accuracy of synchronization of the paper splicing positions of the back liner, the center core, and the front liner and to improve the accuracy of the number of finished sheets.
If the synchronization accuracy of the paper splicing position and the accuracy of the number of finished sheets are improved, the defective portion length at the paper splicing portion is reduced, so that the amount discarded as a defective is reduced, and the manufacturing cost of the corrugated cardboard sheet can be reduced.
In addition, the exit step sensor is used for both the calculation of the step number in the step number calculation unit and the step step pitch calculation in the step step pitch calculation unit. Can be reduced.

  In the corrugating machine according to the present invention, the distance that the double-sided cardboard is conveyed is detected by using a measuring wheel that measures the production length of the double-sided cardboard.

  In this way, the distance that the double-sided cardboard is transported is detected using a measuring vehicle that measures the production length of the double-sided cardboard, so there is no need to provide a separate distance measurement detector for calculating the mountain pitch. Therefore, it can be made cheaper.

  In the corrugating machine according to the present invention, when the step pitch used for the calculation is out of a predetermined range, the stay length calculation unit uses the step pitch or the reference step pitch previously used for the calculation. And calculating the staying amount.

For example, if there is a bonding failure in a part of the single-sided cardboard, the stepped core can move freely in that part, so the corrugated pitch varies greatly.
In the present invention, it is checked whether or not the step pitch used in the calculation is within the predetermined range. If it is out of the predetermined range, it is determined as abnormal, and the step pitch is not used for the calculation. The dwell amount is calculated using the step pitch or the reference step pitch used in the calculation.
Thereby, it can prevent that a big error generate | occur | produces by bonding failure etc.

  The production management device according to the present invention stores at least one single facer for producing a single-sided cardboard by bonding a back liner to a stepped core, and stores the single-sided cardboard from the single facer. A bridge part to be supplied to the next process, a double facer for producing at least a double-sided cardboard by bonding a surface liner to the core side of the single-sided cardboard supplied from the bridge part, and the double-sided cardboard conveyed from the double facer. A production management device for controlling the operation of a corrugating machine comprising a processing device for cutting a corrugated cardboard sheet, an inlet step sensor for detecting a step of a single-sided corrugated cardboard entering the bridge unit, and a single side exiting from the bridge unit The number of steps of single-sided corrugated cardboard staying in the bridge section is determined using an exit corrugated sensor that detects the corrugated cardboard. Detecting the distance by which the double-sided cardboard is transported in the vicinity of the processing apparatus while the exit step sensor detects the predetermined number of steps and the exit step sensor detects the predetermined number of steps. A step mountain pitch calculating unit that calculates a step mountain pitch by dividing, and multiplying the step mountain number calculated by the step mountain number calculating unit by the step mountain pitch calculating unit by the step mountain pitch calculating unit. A residence length calculation unit that calculates the residence length of the single-sided cardboard that stays in the bridge portion.

According to the present invention, the step number calculation unit adds and counts every time the entrance step sensor detects a step from the point when the predetermined point of the single-sided cardboard passes, for example, the entrance step sensor. For example, from the point when a predetermined point on the single-sided cardboard passes through the exit step sensor, the count is incremented every time the entrance step sensor detects the step, and subtracted every time the exit step sensor detects the step. .
As a result, the number of steps of the single-sided cardboard that is between the entrance step sensor and the exit step sensor at any time, that is, stays in the bridge portion, is accurately calculated.
It should be noted that the addition count start timing of the inlet step sensor is an arbitrary position between the single facer and the bridge portion, and the subtraction count start timing of the exit step sensor is between the bridge portion and the double facer. It can be set to any position between.
The step pitch calculator detects the distance that the double-sided cardboard is transported in the vicinity of the processing apparatus while the exit step sensor detects a predetermined number of steps, and divides this distance by the predetermined number. Calculate the mountain pitch.
The staying length calculation unit calculates the staying length of the single-sided cardboard that stays in the bridge portion by multiplying the calculated step number by the step pitch.

Thus, since the distance between the double-sided cardboards in the vicinity of the processing apparatus is used to calculate the corrugated pitch, the length of the product itself is used.
In addition, since the distance through which the predetermined number of terraces passes is detected, the detected distance has a certain length, and the detection can be performed with high accuracy.
The predetermined number is preferably several tens to several hundreds from the viewpoints of detection accuracy, influence of accumulated error, detection timing, and the like.
Furthermore, since the corrugated pitch is calculated for the corrugated mountain of the single-sided cardboard at the location where the exit corrugated sensor is installed, i.e., where it exits from the bridge, the drying process for the single-sided cardboard is almost completed, It will be calculated in a portion with less fluctuation.
As a result, the staying length of the single-sided cardboard staying in the bridge portion can be accurately calculated.

When the stay length is accurately determined, the total length of the sheets existing in the corrugating machine is accurately determined. Therefore, the control operation controlled based on this, for example, the paper splicing timing can be accurately performed. .
When the paper splicing timing is accurate, it is possible to improve the accuracy of synchronization of the paper splicing positions of the back liner, the center core, and the front liner and to improve the accuracy of the number of finished sheets.
If the synchronization accuracy of the paper splicing position and the accuracy of the number of finished sheets are improved, the defective portion length at the paper splicing portion is reduced, so that the amount discarded as a defective is reduced, and the manufacturing cost of the corrugated cardboard sheet can be reduced.
In addition, the exit step sensor is used for both the calculation of the step number in the step number calculation unit and the step step pitch calculation in the step step pitch calculation unit. Can be reduced.

  The production management apparatus according to the present invention is characterized in that the distance by which the double-sided cardboard is transported is detected using a measuring vehicle that measures the production length of the double-sided cardboard.

  In this way, the distance that the double-sided cardboard is transported is detected using a measuring vehicle that measures the production length of the double-sided cardboard, so there is no need to provide a separate distance measurement detector for calculating the mountain pitch. Therefore, it can be made cheaper.

  Further, in the production management device according to the present invention, the stay length calculation unit, when the step pitch used for the calculation is out of a predetermined range, determines the step pitch or reference step pitch previously used for the calculation. And calculating the retention amount.

For example, if there is a bonding failure in a part of the single-sided cardboard, the stepped core can move freely in that part, so the corrugated pitch varies greatly.
In the present invention, it is checked whether or not the step pitch used in the calculation is within the predetermined range. If it is out of the predetermined range, it is determined as abnormal, and the step pitch is not used for the calculation. The dwell amount is calculated using the step pitch or the reference step pitch used in the calculation.
Thereby, it can prevent that a big error generate | occur | produces by bonding failure etc.

According to the present invention, since the distance to which the double-sided cardboard is transported in the vicinity of the processing apparatus is used to calculate the corrugated pitch, it is possible to accurately calculate the residence length of the single-sided cardboard that stays in the bridge portion. it can.
As a result, it is possible to improve the synchronization accuracy of the paper splice positions of the back liner, the center core, and the front liner and to improve the accuracy of the number of finished sheets, so that defective portions can be reduced and the manufacturing cost of the cardboard sheet can be reduced.

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 shaft 13, a slitter scorer (processing device) 15, and a cutoff (processing). Device) 17, stacker 19, and production management device 21.
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 having substantially the same structure arranged along the conveyance direction of the double-sided cardboard 47. Hereinafter, the structure of the first slitter scorer unit 15a will be described.
The first slitter scorer unit 15a is provided with a plurality of sets of upper ruled line rolls 61 and lower ruled line rolls 63 arranged in the width direction so as to face each other with the double-sided cardboard 47 interposed therebetween on the upstream side in the transport direction. The upper ruled line roll 61 and the lower ruled line roll 63 are 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 a pair of knife cylinders 69 and 69 which are opposed to each other with the double-sided cardboard 47 interposed therebetween and are rotated in opposite directions.
A knife extending in the width direction is provided on the peripheral surface of the knife cylinder 69.
When the pair of knife cylinders 69 and 69 are rotated and the knives are engaged, the double-faced cardboard 47 is configured to be cut in the width direction.
Discharge means for discharging the defective corrugated cardboard sheet 71 downward is provided on the downstream side of the cutoff device 17.
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.
As related to the present invention, as shown in FIG. 2, an entrance step sensor 75, an exit step sensor 77, a measuring wheel 79, and a measuring wheel encoder 81 are provided.

The inlet terrace sensor 75 is installed at a position between the single facer 5 and the bridge portion 7 so as to face the terrace 42 of the single-sided cardboard 41.
The exit corrugation sensor 77 is installed at a position between the bridge portion 7 and the glue machine 9 so as to face the corrugation 42 of the single-sided cardboard 41.
The entrance terrace sensor 75 and the exit terrace sensor 77, for example, emit laser light toward the single-sided cardboard 41 and detect the top of the terrace 42 by the reflected light.
The inlet hill sensor 75 and the outlet hill sensor 77 are configured to transmit detection signals (an inlet hill signal and an outlet hill signal) when the top of the hill 42 is detected.
The inlet corrugation sensor 75 is an electromagnetic proximity switch disposed facing the corrugated roll gear that rotates in mesh with the upper roll 33 of the single facer 5, and the corrugated stage switch (in the concave portion of the circumferential surface of the upper roll 33). The detection signal may be transmitted by detecting the number of convex portions engaged. This counts the number of cores 29 that are stepped and processed into a wave shape (or equivalent).

The measuring wheel 79 is rotatably mounted on the double facer side of the rotary 13.
The measuring wheel 79 is installed so that its axis is orthogonal to the conveying direction of the double-sided cardboard 47 and so as to come into contact with the double-sided cardboard 47 and rotate along with its conveyance.
The measurement vehicle encoder 81 is configured to transmit a pulse (measurement vehicle pulse) every time the measurement vehicle 79 rotates by a predetermined amount.
The circumference of the measuring wheel 79 corresponding to a predetermined amount of rotation of the measuring wheel 79 is a rate, and indicates the distance of the double-sided cardboard 47 that moves between pulses.

The production management device 21 includes a stay length calculation unit 83, a production length calculation unit 85, a base paper set length storage unit 87, a remaining supply length calculation unit 89, and an operation control unit 91.
The staying length calculation unit 83 calculates the length (staying length L) of the single-sided cardboard 41 staying between the inlet step sensor 75 and the outlet step sensor 77, that is, in the bridge unit 7.
The stay length calculation unit 83 includes a step number calculation unit 93, a step mountain pitch calculation unit 95, and a stay length calculation unit 97.
The step number calculation unit 93 outputs the inlet step signal of the inlet step sensor 75 via the inlet step signal distributor 99 and the outlet step of the outlet step sensor 77 via the outlet step signal distributor 101. Each of the mountain signals is received, and the number N of steps of the single-sided cardboard 41 staying in the bridge portion is calculated based on these signals.

A step mountain pitch calculation unit 95 outputs an exit step mountain signal from the exit step mountain sensor 77 via the exit step mountain signal distributor 101, and a measurement vehicle pulse from the measurement vehicle encoder 81 via the measurement vehicle pulse distributor 103. Each is received and the stepped pitch P (see FIG. 2) is calculated based on these.
The stay length calculation unit 97 calculates the stay length L by multiplying the step number N calculated by the step number calculation unit 93 by the step pitch P calculated by the step pitch calculation unit 95. .
The stay length calculation unit 97 has a function of sequentially overwriting and storing the stepped pitch P used for the calculation.

The production length calculation unit 85 is configured to receive the measurement vehicle pulse of the measurement vehicle encoder 81 via the measurement vehicle pulse distributor 103.
For example, the production length calculation unit 85 adds and counts the measurement vehicle pulses received at the timing when the start end of the current order passes through the measurement vehicle 79, and multiplies the counted measurement vehicle pulse number by the rate to pass through the measurement vehicle 79. The length (production length S) of the double-sided cardboard 47 in the current order is calculated.
The production length S may be calculated by, for example, multiplying the rotation speed of the knife cylinder 69 of the cutoff device 17 by the length of the cardboard sheet 71.
The base paper set length storage unit 87 obtains, for example, information about the length and the number of sheets of the corrugated cardboard sheet 71 produced in the current order, and calculates and stores the base paper length S0 necessary for manufacturing the information. .

  The supply remaining length calculating unit 89 receives the staying length L from the staying length calculating unit 97, and calculates the lengths (total staying length La) of the base paper, single-sided cardboard, double-sided cardboard, etc. existing from the mill roll stand 3 to the measuring wheel 79. The production length S from the production length calculation unit 85 is added to this, and the length fed from the mill roll stand 3 for the production of the current order is calculated. Then, the remaining supply length calculation unit 89 divides this already fed length from the base paper length S0 required to manufacture the current order received from the base paper set length storage unit 87, thereby producing the current order. Therefore, the length (feed remaining length Lz) to be fed from the mill roll stand 3 required in the future is calculated.

The operation control unit 91 controls the operation of each unit of the corrugating machine 1.
The operation control unit 91 receives, for example, the remaining supply length Lz calculated by the remaining supply length calculation unit 89, prepares the sheet joining before the remaining supply length Lz reaches a predetermined value, and the remaining supply length Lz becomes zero. The splicer 25 is instructed to splice at the specified timing, and the splicing is performed.

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 66 and the front liner 64 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 cardboard 47 is processed with a ruled line for easy folding by the upper ruled line roll 61 and the lower ruled line roll 63 in the first slitter scorer unit 15a along the conveying direction, and then conveyed by the upper slitter knife 65 and the lower slitter knife 67. Cut along the direction.
At this time, the second slitter scorer unit 15b is set in a standby state according to an instruction from the operation control section 91, and the width direction positions of the upper ruled line roll 61, the lower ruled line roll 63, the upper slitter knife 65, and the lower slitter knife 67 are set 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 cut in the width direction by knife cylinders 69 and 69 of a cut-off device to form a cardboard sheet 71 having a predetermined length.
The cardboard sheets 71 are transported by the transport conveyor 73, stacked on the stacker 19, and discharged outside the apparatus.

Next, the order change will be described with an example of order change in which the type of base paper changes.
In such an order change, paper splicing is performed at the order switching position in the back liner mill roll stand 3a, the center core mill roll stand 3b, and the front liner mill roll stand.
In this way, the splicing when the type of base paper changes is particularly called “paper replacement”, distinguishing it from the fact that one normal roll paper disappears and the other base paper from the same type of roll paper “paper splicing”. Yes.
Since the corrugated cardboard sheet 71 including the paper joint portion is not a product and is discarded as a defective corrugated cardboard sheet 71, in order to reduce defects, in the case of paper replacement, the back liner 27, the core 29, and the front liner 31 It is important that the splicing positions are synchronized.

For this reason, it is necessary to accurately grasp the end position of the current order.
A method for grasping the end position of the current order will be described.
The remaining supply length Lz that needs to be supplied by the end of the current order is from the base paper length S0 required to produce the current order to the production length S that has already been produced and the mill roll stand 3 to the measuring vehicle 79. The total stay length La staying is divided.
The base paper length S0 is calculated by the base paper set length storage unit 87 based on, for example, information on the length and the number of sheets of the corrugated cardboard sheets 71 produced in the current order, and stored in the base paper set length storage unit 87.

The production length S is calculated by the production length calculation unit 85.
In the production length calculation unit 85, for example, the measurement vehicle pulse received from the measurement vehicle encoder 81 from the time when the starting end portion of the current order passes through the measurement vehicle 79 is added and counted, and the counted number of measurement vehicle pulses is multiplied by the rate. The
In this way, the length of the double-sided cardboard 47 that has passed the measuring wheel 79 is calculated as the production length S.

Next, calculation of the total residence length La will be described. The total residence length La includes a portion that can be immediately recognized from the device dimensions and a portion that cannot be recognized.
A method of calculating the length of the single-sided cardboard 41 staying in the bridge portion 7 that is not known from the device dimensions will be described.
The step number calculation unit 93 is configured such that a predetermined point of the single-sided cardboard 41 conveyed from the single facer 5, for example, a start end portion of the current order passes through a first predetermined position between the single facer 5 and the bridge unit 7. From this point in time, the addition count (first count) of the inlet terrace signal received from the inlet terrace sensor 75 is started.
The step number calculation unit 93 receives from the exit step sensor 77 from the time when the starting end portion of the current order of the single-sided cardboard 41 conveyed from the bridge 7 passes the second predetermined position between the bridge portion 7 and the double facer. Addition count (second count) of the exit mountain signal is started.
The step count calculation unit 93 calculates the step count N by subtracting the second count from the first count.

These start timings are measured, for example, by marking a predetermined point on the single-sided cardboard 41 and detecting the mark with detectors installed at the first predetermined position and the second predetermined position.
The first count counts the stepped mountain where the predetermined point of the single-sided cardboard 41 has passed the first predetermined position.
In the second count, the stepped mountain where the predetermined point of the single-sided cardboard 41 has passed the second predetermined position is counted.
Therefore, when the second count is subtracted from the first count, the number N of all corrugations of the single-sided cardboard 41 existing from the first predetermined position to the second predetermined position, that is, staying in the bridge portion, is calculated. Become.

The calculation of the terrace mountain pitch P in the terrace mountain pitch calculation unit 95 will be described with reference to FIG.
The terrace mountain pitch calculation unit 95 starts calculating the terrace mountain pitch P according to the calculation instruction (step S1).
The step mountain pitch calculation unit 95 starts counting the exit step mountain signal sent from the exit step mountain sensor 77 with a predetermined counter (step S2). Since the exit mountain signal is transmitted every time the mountain 42 passes through the exit mountain sensor 77, the number of mountains passing through the exit mountain sensor 77 is counted in step S2.

At the same time, counting of the measurement vehicle pulse sent from the measurement vehicle encoder 81 is started by another counter (step S3). Since the measuring wheel pulse is transmitted every time the measuring wheel rotates by a predetermined angle, that is, each time the double-sided cardboard 47 moves by a predetermined distance, it counts the amount corresponding to the movement amount of the double-sided cardboard 47 from the start of counting. .
It is determined whether the number of steps that started counting in step S2 has reached a predetermined number, for example, 100 (step S4).
The predetermined number is appropriately selected within the range of several tens to several hundreds from the viewpoint of detection accuracy, the influence of accumulated error, detection timing, and the like.

When the number of steps does not reach 100 (NO), the count of the exit step signal and the measurement vehicle pulse is continued.
When the number of steps reaches 100 (YES), the step pitch calculation unit 95 multiplies the counted number of measured vehicle pulses by the rate (movement distance of the double-sided cardboard 47 per measured vehicle pulse). The moving distance (traveling length) of the double-sided cardboard 47 during this period is calculated (step S5).
Thereafter, the travel length is divided by 100, which is the corresponding step number, to calculate the step pitch P (step S6).

Thus, since the running pitch of the double-sided cardboard detected by the measuring wheel 79 is used to calculate the stepped pitch P, it is calculated using the length of the product itself.
Further, since the distance that 100 terraces pass through is detected, the running length during this period is about 85 cm for the A flute and about 60 cm for the B flute. Further, the double-sided cardboard 47 has a high strength and may be stably conveyed, and can be detected with high accuracy even by a normal measuring vehicle 79.
Further, since the exit corrugation sensor 77 is installed between the bridge portion 7 and the double facer 11, the drying process of the single-sided cardboard 41 is substantially completed, and the exit corrugation sensor 77 is calculated at a portion where the fluctuation of the corrugation pitch P is less. It will be.

Accordingly, the corrugated pitch P can be calculated with high accuracy in accordance with the double-sided cardboard 47 that is an actual product.
Further, in the calculation of the number of steps and the calculation of the travel length in the step number calculation unit 95, the signal from the exit step sensor 77 used in the step number calculation unit 93 and the measurement vehicle 79 used in the production length calculation unit 85 are used. Therefore, it is not necessary to provide a separate detector for calculating the terrace pitch, and the cost can be reduced accordingly.

The step number calculation unit 95 calculates the step step pitch P shown in FIG. 3 while shifting, for example, ten steps, and averages the step step pitch P calculated by each step. The stepped pitch P may be provided to the stay length calculator 97.
In this way, even when the fluctuation of the terrace mountain pitch is large, a more accurate terrace mountain pitch P can be provided to the stay length calculator 97.

The calculation of the stay length L in the stay length calculation unit 97 will be described with reference to FIG.
The stay length calculator 97 starts to calculate the stay length L according to the calculation instruction (step S11).
The stay length calculator 97 receives and inputs the number N of hills calculated by the hill number calculator 93 (step S12).
Next, the staying length calculation unit 97 receives and inputs the step mountain pitch P calculated by the step mountain pitch calculation unit 93 (step S13).

The stay length calculator 97 determines whether or not the input step pitch P is within a predetermined range (step S14).
Note that the predetermined range is, for example, ± 1% of the reference terrace pitch (theoretical terrace pitch).
If the step pitch P is within the predetermined range (YES), the stay length calculation unit 97 calculates the stay length L by multiplying the input step number P by the input step number P. (Step S15).
The terrace pitch P used for this calculation is stored. This storage is performed so as to be overwritten sequentially. Therefore, the latest terrace pitch P used for calculation is stored.

If the stepped pitch P is not within the predetermined range (NO), it is determined that it includes a defective portion such as a bonding failure, and instead of the input stepped pitch, the stored previous calculation is used. The used terrace pitch P is supplied to the calculation unit (step S16), and the residence length L is calculated by multiplying the terrace pitch P by the terrace number N.
In this case, the reference step pitch may be used instead of the step pitch P used in the previous calculation.

In this way, the stay length L is calculated using the stepped pitch P that is accurately calculated according to the actual product, so that the stay length L can be accurately calculated with little error.
Moreover, since the stepped pitch P of the portion including a defective portion such as a bonding failure with many errors is not used for the calculation, it is possible to prevent a large error from being generated due to a bonding failure or the like.

The remaining supply length calculation unit 89 receives the stay length L from the stay length calculation unit 97, and determines the length (total stay length La) of the base paper, single-sided cardboard, double-sided cardboard, etc. existing from the mill roll stand 3 to the measuring wheel 79. calculate.
The production length S from the production length calculation unit 85 is added to this to calculate the length already fed from the mill roll stand 3 for the production of the current order.
Then, the remaining supply length calculation unit 89 calculates the remaining supply length Lz by dividing the already fed length from the base paper length S0 received from the base paper set length storage unit 87.
This is done for the backing liner, core, and front liner base paper.

The operation control unit 91 receives the supply remaining length Lz of each base paper calculated by the supply remaining length calculation unit 89, and when the supply remaining length Lz of each base paper becomes smaller than the remaining paper length of the paper roll 23 in use, A paper roll 23 of each base paper used in the order is mounted on each mill roll stand 3 to prepare for paper splicing.
The operation control unit 91 instructs the splicer 25 to perform paper splicing at the timing when the remaining supply length Lz becomes 0−α for each base paper, and performs paper splicing.
α takes into account the calculation error of the remaining supply length Lz and errors due to other factors, and has a margin to ensure the production length of the current order.

FIG. 5 shows a state in which the paper spliced portion that has been replaced is a double-sided cardboard 47.
On the upstream side of the final cutting position 105 in the current order, there are a back liner paper splicing position 107, a center core paper splicing position 109, and a front liner paper splicing position 111.
The distance from the downstream end to the upstream end of the back liner splice position 107, the center core splice position 109, and the front liner splice position 111 is referred to as a splice synchronization length 113. The defect removal length 115 is removed as follows.
The part following the defect removal length 115 becomes the product of the next order.

As described above, since the residence length L can be calculated accurately, the remaining supply length Lz can be calculated accurately. If the supply length Lz can be calculated accurately, the accuracy of the number of finished sheets in the current order can be improved, the margin α can be reduced, and the splicing timing of each base paper can be made accurate.
When the paper splicing timing becomes accurate, the synchronization accuracy of the paper splicing positions of the back liner, the center core, and the front liner is improved, so that the paper splicing synchronization length 113 can be shortened.
When the paper splicing synchronization length 113 is shortened, the defect removal length 115 is decreased, so that the amount discarded as a defect is decreased, and the manufacturing cost of the corrugated cardboard sheet 71 can be reduced.

  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.

It is a front view which shows the whole schematic structure of the corrugating machine 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 stepped pitch calculation method concerning one Embodiment of this invention. It is a flowchart which shows the residence length calculation method concerning one Embodiment of this invention. It is sectional drawing which shows the paper splicing part which changed the paper concerning one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Corrugated machine 5 Single facer 7 Bridge part 11 Double facer 15 Slitter scorer 17 Cut-off device 21 Production control device 27 Back liner 29 Center core 31 Front liner 41 Single-sided cardboard 47 Double-sided cardboard 75 Inlet corrugated sensor 77 Outlet corrugated sensor 79 Measurement Car 83 Residence length calculation unit 93 Step number calculation unit 95 Step mountain pitch calculation unit 97 Residence length calculation unit

Claims (6)

At least one single facer that manufactures single-sided cardboard by bonding a back liner to a stepped core;
A bridge portion for supplying the next process while storing single-sided cardboard from the single facer;
A double facer for producing at least a double-sided cardboard by laminating a front liner on the center side of the single-sided cardboard supplied from the bridge part;
A processing apparatus for cutting the double-sided cardboard conveyed from the double facer into cardboard sheets;
A corrugating machine comprising a production management device that has at least a residence length calculation unit that calculates the residence length of the single-sided cardboard that stays in the bridge unit, and controls the operation of the entire device,
The stay length calculation unit uses an inlet step sensor for detecting a step of a single-sided cardboard entering the bridge unit and an exit step sensor for detecting a step of a single-sided cardboard exiting the bridge unit. A step number calculator for calculating the number of steps of the single-sided corrugated cardboard,
While the exit step sensor detects a predetermined number of steps, the distance to which the double-sided cardboard is conveyed in the vicinity of the processing device is detected, and the step is calculated by dividing the distance by the predetermined number. A stepped pitch calculation unit,
A stay length calculating unit that calculates the stay length by multiplying the step number calculated by the step number calculating unit by the step number calculated by the step pitch calculating unit. Corrugating machine characterized by   The corrugating machine according to claim 1, wherein the distance by which the double-sided cardboard is conveyed is detected by using a measuring wheel that measures the production length of the double-sided cardboard.   The staying length calculating unit calculates the staying amount using the stepped pitch or the reference stepped pitch previously used for the calculation when the stepped pitch used for the calculation is out of a predetermined range. The corrugating machine according to claim 1 or 2. At least one single facer that manufactures single-sided cardboard by bonding a back liner to a stepped core;
A bridge portion for supplying the next process while storing single-sided cardboard from the single facer;
A double facer for producing at least a double-sided cardboard by laminating a front liner on the center side of the single-sided cardboard supplied from the bridge part;
A production management device for controlling the operation of a corrugating machine, comprising a processing device for cutting the double-sided cardboard conveyed from the double facer into a cardboard sheet,
The number of steps of single-sided corrugated cardboard staying in the bridge portion using an inlet stepping sensor that detects the stepped amount of single-sided cardboard entering the bridge portion and the exit stepping sensor that detects the stepped amount of single-sided cardboard coming out of the bridge portion. A step number calculator for calculating
While the exit step sensor detects a predetermined number of steps, the distance by which the double-sided cardboard is transported in the vicinity of the processing device is detected, and the step is calculated by dividing the distance by the predetermined number. A stepped pitch calculator,
Residence length calculation for calculating the residence length of single-sided cardboard that stays in the bridge portion by multiplying the number of terraces calculated by the terrace number calculation unit by the terrace pitch calculated by the terrace pitch calculation unit. And a production management device.   6. The production management apparatus according to claim 5, wherein the distance by which the double-sided cardboard is conveyed is detected by using a measuring wheel that measures the production length of the double-sided cardboard. The staying length calculating unit calculates the staying amount using the stepped pitch or the reference stepped pitch previously used for the calculation when the stepped pitch used for the calculation is out of a predetermined range. The production management device according to claim 4 or 5, wherein

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