JP5936261B2 - Corrugated sheet manufacturing equipment - Google Patents

Description

  The present invention relates to a corrugated sheet manufacturing apparatus, and in particular, a corrugated sheet for manufacturing a corrugated sheet for producing a corrugated box by applying a plurality of ruled lines by a box making machine and bending and joining at the positions of these ruled lines. It relates to a manufacturing apparatus.

  A corrugated sheet manufacturing apparatus for manufacturing corrugated cardboard sheets is a single facer that combines a core and a liner to manufacture a single-sided cardboard sheet, and another liner is bonded to this single-sided cardboard sheet to manufacture a double-sided cardboard sheet. A double facer, a slitter scorer device that performs slit processing and ruled line processing along a sheet flow direction on a double-sided cardboard sheet, and a cutter device that cuts the double-sided cardboard sheet to a predetermined cutting length in the sheet flow direction, It has.

  In such a corrugated sheet manufacturing apparatus, when a single-sided corrugated sheet is manufactured with a single facer, the corrugated pitch of the core in which the step (wave shape) is formed is the tension that acts on the paper temperature, moisture content, and liner. As a result, the step pitch changes to cause a phase shift, which causes various problems.

  For example, Patent Document 1 describes a corrugated sheet manufacturing apparatus, and the corrugated sheet manufacturing apparatus includes a first single facer that bonds a first core paper (first core) formed in a corrugated shape to a liner; A second single facer for bonding a second core paper (second core) formed in a predetermined waveform so as to match the waveform of the first core paper is provided. In this corrugated sheet manufacturing apparatus, When the phase shift of the waveform of the core paper and the second core paper occurs, the tension of the single-sided cardboard sheet formed by the first single facer is adjusted so that the phases of the two coincide with each other.

  Patent Document 2 (see paragraph [0005]) describes a corrugated cardboard box making machine, and in this corrugated cardboard box making machine, a position for placing a ruled line is provided between the corrugated sheets of the corrugated cardboard sheet. Or, when folding with folder gluer, depending on whether it is applied to the position of the stepped mountain, the bending method is different and a bending process failure occurs, so a second ruled line different from the existing ruled line giving tool is given Tools are provided, and these ruled line applicators provide ruled lines to the cardboard sheet.

Japanese Patent No. 2786620 JP 2002-36388 A

  In the corrugated cardboard sheet produced by the corrugated cardboard production apparatus, as described above, when producing a single-sided corrugated cardboard sheet using a single facer, the core corrugated pitch varies depending on the paper temperature, moisture content, tension acting on the liner, etc. Since the phase of the corrugated sheet does not match in each corrugated cardboard sheet, the size of the corrugated board sheet is not aligned. There was a large variation in the bending method, and therefore, the bonding accuracy in the box making process was lowered, and the box dimensions were not uniform. This problem has not been solved yet, and there is a demand for a solution to the problem.

  Therefore, the present invention has been made in response to a conventional request, adjusting the phase of the core step pitch when manufacturing a single-sided corrugated cardboard sheet, in a box making process by a box making machine thereafter, Provided is a corrugated sheet manufacturing apparatus capable of improving the joining accuracy of corrugated sheets and making the box dimensions uniform by aligning the phase of the core step pitch at each ruled line position where each corrugated sheet is processed. The purpose is that.

In order to achieve the above object, the present invention provides a corrugated cardboard sheet for producing a corrugated cardboard sheet for producing a corrugated cardboard box by forming a plurality of ruled lines with a box making machine and bending and joining them at the positions of the respective ruled lines. A single facer for manufacturing a single-sided cardboard sheet by bonding a core having a predetermined step pitch and a liner, and a double-sided cardboard sheet by bonding another liner to the single-sided cardboard sheet. A double facer for manufacturing the double-faced cardboard sheet and a cutter device for cutting the double-faced cardboard sheet to a predetermined cutting length along the sheet flow direction. A step pitch calculation device that calculates and sets the step pitch value to be an integral multiple of the pitch, and a single-sided cardboard sheet sent out from a single facer A step pitch detecting device for detecting a step pitch, and a liner fed to the single facer so that the step pitch of the single-sided corrugated cardboard sheet detected by the step pitch detecting device is equal to the step pitch set by the step pitch calculating device. And a tension adjusting device that adjusts the tension.
According to the present invention configured as described above, in the single facer, the step pitch is set so that the cutting length of the double-sided corrugated cardboard sheet is an integral multiple of the center core step pitch. The phase of the corrugated mountain of each corrugated cardboard sheet cut to length can be made uniform. Further, the step pitch of the single-sided cardboard sheet sent out from the single facer is detected, and the tension of the liner fed into the single facer is adjusted so that the detected step pitch of the single-sided cardboard sheet becomes equal to the set step pitch. Like that. Therefore, the phase of the step at the position of each ruled line of the corrugated board sheet in the subsequent folding process by the box making machine can be made uniform, improving the joining accuracy of the corrugated board sheet in the box making process and making the box dimensions uniform. be able to.

In the present invention, it is preferable that the step pitch detection device detects an image of the surface of the single-sided cardboard sheet provided on the exit side of the single facer, and processes the image detected by the image detection device. And an image processing device for detecting the step pitch of the single-sided cardboard sheet.
According to the present invention configured as described above, an image of the surface of the single-sided cardboard sheet is detected, and the detected image is processed to detect the step pitch. The step pitch can be detected, thereby improving the bonding accuracy of the corrugated board sheet and making the box dimensions uniform in the subsequent box making process.

In the present invention, preferably, the single facer includes a press roll for pressing and bonding the liner to the core, and the image detecting device detects a press mark formed on the liner surface by the press roll .
According to the present invention configured as described above, since the image detection device detects the press mark formed on the liner surface by the press roll , the phase shift of the step pitch can be reliably detected. Thereby, in the subsequent box-making process, the bonding accuracy of the corrugated cardboard sheet can be improved, and the box dimensions can be made uniform.

In the present invention, preferably, the image detecting device detects an image of a corrugated mountain of a single-sided cardboard sheet.
According to the present invention configured as described above, since the image detection device detects the stepped mountain of the single-sided cardboard sheet, it can reliably detect the phase shift of the step pitch, and thereafter In the box making process, the joining accuracy of the corrugated cardboard sheet can be improved, so that in the subsequent box making process, the joining precision of the corrugated cardboard sheet can be improved and the box dimensions can be made uniform.

In the present invention, the image detection device is preferably a CCD camera.
According to the present invention configured as described above, since the CCD camera is used as the image detection device, it is possible to easily and accurately detect the phase shift of the step pitch.

In the present invention, it is preferable that the cutter device detects the phase of the stepped mountain of the double-sided cardboard sheet before cutting the double-sided cardboard sheet, and the double-sided cardboard detected by the stepped phase detection device. A speed control device for controlling the rotational speed of the cutter device and correcting the amount of deviation within a predetermined range when the phase of the step of the sheet is shifted from the phase of the step at the scheduled cutting position; Have.
In the present invention configured as described above, when the phase of the corrugated mountain of the double-sided corrugated cardboard sheet is deviated from the phase of the corrugated mountain at the planned cutting position before cutting the double-sided corrugated cardboard sheet, this deviation amount is set to Therefore, in the subsequent box making process, the joining accuracy of the corrugated cardboard sheet can be further improved, and the box dimensions can be made uniform.

In the present invention, it is preferable that the corrugated phase detection device detects an image on the surface of the double-sided cardboard sheet, and processes the image detected by the image detection device to detect the phase of the corrugated phase of the double-sided cardboard sheet. And an image detection device for detecting.
In the present invention configured as described above, the image detection device detects the image on the surface of the double-sided cardboard sheet, and the image processing device processes the detected image. The phase can be detected accurately, and in the subsequent box-making process, the bonding accuracy of the cardboard sheets can be further improved, and the box dimensions can be made uniform.

  According to the corrugated board manufacturing apparatus of the present invention, the phase of the core corrugated pitch is adjusted when the single-sided corrugated board sheet is manufactured, and in the subsequent box making process, each corrugated board sheet is processed at each ruled line position. By aligning the phase of the core step pitch, the bonding accuracy of the corrugated cardboard sheet can be improved and the box dimensions can be made uniform.

It is a side view showing the whole corrugated cardboard manufacturing device by the embodiment of the present invention. It is a side view which shows the single facer of the corrugated-cardboard sheet manufacturing apparatus by embodiment of this invention, the base paper hook for liners, and a splicer. It is an enlarged step view showing a part of the single-sided cardboard sheet. It is a side view which shows the cutter apparatus of the cardboard sheet manufacturing apparatus by embodiment of this invention. It is a flowchart which shows the control flow in the single facer of the corrugated board sheet manufacturing apparatus by embodiment of this invention. It is a flowchart which shows the control flow in the cutter apparatus of the cardboard sheet manufacturing apparatus by embodiment of this invention. FIG. 7A is a plan view showing a double-sided cardboard sheet manufactured by the cardboard sheet manufacturing apparatus according to the embodiment of the present invention, and FIG. 7B is manufactured by the cardboard sheet manufacturing apparatus according to the embodiment of the present invention. It is a side view of each cardboard sheet. FIG. 8A is a plan view showing a double-sided corrugated cardboard sheet manufactured by the corrugated board machine after being manufactured by the corrugated cardboard manufacturing apparatus according to the embodiment of the present invention, and viewed along the line AA of this plan view. FIG. 8B is a partial cross-sectional view at each ruled line position in each double-sided cardboard sheet. It is a top view which shows the bonding part of the cardboard sheet | seat bonded together in the box making process. It is a diagram which shows the dispersion | variation in the gap amount of the bonding part in each corrugated cardboard sheet | seat manufactured with the conventional corrugated cardboard sheet manufacturing apparatus and the corrugated cardboard sheet manufacturing apparatus by embodiment of this invention, respectively.

Next, a cardboard sheet manufacturing apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings.
First, referring to FIG. 1, the overall structure of a corrugated board manufacturing apparatus according to an embodiment of the present invention will be described. Reference numeral 1 denotes a corrugated sheet manufacturing apparatus (corrugator machine). The corrugated sheet manufacturing apparatus 1 is a single-sided corrugated sheet 6 formed by laminating a core 2 and a liner 4 on which a step having a predetermined step pitch P is formed. A single facer 8 for manufacturing the double-sided cardboard sheet 12 by bonding another liner 10 to the single-sided cardboard sheet 6 and the double-sided cardboard sheet 12 along the flow direction F1 (ie, the corrugated board). A slitter scorer 13 for performing slit processing (see slit 9 in FIG. 7A) and ruled line (see ruled line 11a in FIG. 7A), and double-sided corrugated cardboard sheet 12 Cutter device 14 for cutting to a predetermined cutting length L in the sheet flow direction F1, and a stacker for stacking the cut double-sided cardboard sheets It is equipped with a device 18.

  As shown in FIG. 1, the corrugated board manufacturing apparatus 1 further includes a core base paper holder 20 for supplying the core 2 to the single facer 8, and a liner base paper holder 22 for supplying the liner 4. The take-up conveyor 24 for feeding the single-sided cardboard sheet 6 produced by the single facer 8 to the double facer 14, the liner base paper rack 26 for supplying another liner 10 to the double facer 14, and the like. Each base paper handle 20, 22, 26 includes splicing splicers 28, 30, 32, respectively.

  Next, the single facer 8 and its peripheral devices will be described with reference to FIGS. The single facer 8 includes a step roll 34 for forming a corrugated step on the core 2. The corrugated roll 34 includes an upper roll 34a having a corrugated step formed on the surface thereof, and a lower roll 34b disposed directly below the upper roll 34a so as to mesh with the upper roll 34a, and the upper roll 34a and the lower roll 34b. Between the two, the core 2 is supplied to form a corrugated step.

  Under the upper right side of the upper roll 34 a, a gluing roller 36 is disposed so as to apply the glue to the steps of the core 2. In the upper region of the upper roll 34a, a press roll 38 is disposed on the upstream side where the liner 4 is supplied, and a support roll 40 is disposed on the downstream side. This press roll 38 joins the stepped mountain of the core 2 and the liner 4 by gluing by the action of a predetermined pressure. As shown in FIG. 3, the surface of the liner 4 (single-sided corrugated cardboard sheet 6) by the pressing force of the press roll 38, more specifically, the portion joined to the stepped portion of the core 2 of the surface of the liner 4 is shown. In addition, a relatively thin press mark M is formed.

  Further, as shown in FIG. 2, a brake device (not shown) is connected to the rotating shaft 42 for holding the liner base paper of the liner base paper hook 22 in order to apply a tension T to the liner 4. A tension T acts on the liner 4 when the core 2 and the liner 4 are bonded to each other around the 34a. The brake force by the brake device can be adjusted by the brake controller 44.

  On the exit side of the single facer 8, a CCD camera 46, which is an image detection device for detecting the press mark M formed on the surface of the single-sided cardboard sheet 6, and an image of the press mark M detected by the CCD camera 46 are displayed. An image processing device 48 for processing is provided. The image processing device 48 measures the interval between the press marks M detected by the CCD camera 46 to obtain the value (length) of the step pitch P of the single-sided cardboard sheet (see FIG. 3). Note that the image processing device 48 may determine the value (length) of the step pitch of the single-sided cardboard sheet 6 by detecting the number of press marks per 300 mm along the flow direction F1, for example. As described above, in this embodiment, the corrugated sheet of the single-sided cardboard sheet 6 is formed by the image detection device (CCD camera 46) for detecting the press mark M and the image processing device 48 for processing the image of the detected press mark M. A step pitch detecting device for detecting the pitch P is configured.

  Next, the cutter device 16 and peripheral devices will be described with reference to FIG. The cutter device 14 includes a pair of cutters 16a arranged in a vertical direction for cutting a double-sided corrugated cardboard sheet with a predetermined length L, and an electric motor 16b for driving the cutters 16a. The rotational speed of the cutter 16a of the cutter device 14 is controlled to be constant by the electric motor 16b when cutting the double-sided corrugated cardboard sheet (constant speed region). When not cutting, the speed changes as will be described later. (Variable speed range).

  Further, on the upstream side of the cutter device 16, a CCD camera 50, which is a second image detecting device for detecting a press mark on the surface of the double-sided corrugated cardboard sheet 12, and an image of the press mark detected by the CCD camera 50. A second image processing device 52 is provided. The CCD camera 50 detects the press mark M at the position of the CCD camera 50, and obtains the position of the press mark M (stepped mountain position) by the second image processing device 52.

  Further, a controller 54 is provided, and when the position of the press mark M is deviated from the cutting position (corrugated mountain position) set by the cutter device 16 of the double-sided corrugated cardboard sheet 12 by the controller 54, the cutter device. By adjusting the rotational speed of the electric motor 16b that drives the 16 cutters 16a, the amount of deviation is corrected, and the double-sided cardboard sheet is cut at a predetermined cutting length L at the position of the step of each double-sided cardboard sheet. (See FIG. 7B). The correction amount of the deviation amount is performed within the cutting accuracy range of the cutter 16a of the cutter device 16.

  Thus, in the present embodiment, the second image detection device (CCD camera 50) that detects the press mark M and the second image processing device 52 that processes the image of the detected press mark M, A stepped phase detector for detecting the stepped phase of the double-sided cardboard sheet 12 is configured.

Next, a control flow in the single facer 8 (see FIG. 2) will be described with reference to FIG. In FIG. 5, S represents each step.
First, in S1, the cutting length L in the flow direction F1 of the corrugated cardboard sheet (double-sided corrugated cardboard sheet 12) to be produced is set (see FIG. 7A). Note that the corrugated cardboard sheet has a corrugated direction perpendicular to the flow direction F1. Next, in S2, the step pitch P is calculated and set so that the cutting length L is an integral multiple of the center step pitch P.

  Next, the process proceeds to S3, and the value of the step pitch P obtained by the calculation is input to the controller of the single facer 8. In step S4, the press mark M on the surface of the single-sided cardboard sheet is detected by the CCD camera 46. Proceeding to S5, the detected image of the press mark M is processed. Proceeding to S6, the interval between the press marks M (= detected step pitch) is measured from the processed image of the press mark M.

  Next, the process proceeds to S7, in which it is determined whether or not the interval between the press marks M (= detected step pitch) is equal to the value of the step pitch P set in S2. If YES, the process proceeds to S11. If NO, the process proceeds to S8, and it is determined whether or not the interval between the press marks M is larger than the value of the step pitch P. In the case of YES, the process proceeds to S9, where the brake controller 44 increases the brake force of the liner base paper hook 22 and increases the tension T of the liner fed to the single facer. By increasing the tension T of the liner, the step pitch value becomes smaller and becomes equal to the set step pitch P value.

  On the contrary, in the case of NO, the process proceeds to S10, where the brake controller 44 decreases the brake force of the liner base paper hook 22 and decreases the tension T of the liner fed into the single facer 8. When the liner tension T is decreased, the step pitch value increases and becomes equal to the set step pitch P value. After S9 and S10, the process proceeds to S11, where it is determined whether or not the production of the corrugated cardboard sheet has been completed. If not, the process returns to S1.

Next, a control flow in the cutter device 16 (see FIG. 4) will be described with reference to FIG. In FIG. 6, S indicates each step.
First, in S <b> 11, the press mark M is detected by the CCD camera 50 on the upstream side of the cutter device 16. Next, in S12, the image of the press mark M detected by the image processing device 52 is processed. Next, in step S13, the corrugated phase of the corrugated cardboard sheet is calculated even at the position of the CCD camera 50. Next, in S14, it is determined whether or not there is a phase lag at the planned cutting position of the cardboard sheet with respect to the stepped phase at the position of the CCD camera 50. If there is a phase delay, the process proceeds to S15, and acceleration control is performed to increase the rotational speed of the cutter device so that the phase delay is eliminated in the above-described variable speed region of the cutter device 16. By this acceleration control, the phase delay at the planned cutting position of the cardboard sheet is eliminated, and each cardboard sheet (double-sided cardboard sheet 12) is cut at the same cardboard phase position (cardboard position).

Next, in S16, it is determined whether or not there is a phase advance at the planned cutting position of the corrugated cardboard sheet with respect to the stepped phase at the position of the CCD camera 50. If YES, the process proceeds to S17 and the cutter device 16 is reached. In this variable speed region, deceleration control is performed to reduce the rotational speed of the cutter device so as to eliminate the phase advance. By this deceleration control, the phase advance at the planned cutting position of the corrugated cardboard sheet is eliminated, and each corrugated cardboard sheet (double-sided cardboard sheet) is cut at the same corrugated phase position (corrugated board position).
Next, it progresses to S18 and it is determined whether the order was complete | finished.

According to the corrugated board manufacturing apparatus according to the above-described embodiment of the present invention, the following excellent operational effects are exhibited.
In the corrugated sheet manufacturing apparatus according to the embodiment of the present invention, first, the corrugated sheet pitch P is calculated and set so that the cutting length L in the flow direction F1 of the corrugated cardboard sheet is an integral multiple of the core pitch. Corrugated phases of the corrugated cardboard sheets (double-faced corrugated cardboard sheet 12) cut to a predetermined cutting length in the flow direction F1 can be made uniform.

  Further, the press mark M on the surface of the single-sided cardboard sheet 6 is detected by the CCD camera 46, and the interval between the press marks M is measured. The interval (= step pitch) is larger than the set step pitch P value. When it is large, the brake force of the liner base 22 is increased, thereby increasing the tension T of the liner 4 fed to the single facer and decreasing the amount of supply of the liner 4, thereby reducing the interval between the press marks M. Is equal to the set step pitch P. Conversely, when the interval between the press marks M is smaller than the set step pitch P, the tension T of the liner 4 is decreased and the supply amount of the liner 4 is reduced. Is increased so that the interval between the press marks M becomes equal to the set step pitch P. As a result, the phase of the cut corrugated cardboard sheets (double-sided corrugated cardboard sheet 12) can be reliably aligned.

Further, since the press mark M formed on the liner surface by the press roll 38 is detected using the CCD camera 46, the phase shift of the step pitch can be reliably detected.

  In the corrugated cardboard sheet manufacturing apparatus 1 according to the present embodiment described above, the press mark M generated on the surface of the corrugated cardboard sheet is detected by the CCD camera 46. You may make it image | photograph a mountain and detect the step of a single-sided cardboard sheet. In this case, similarly, the tension T of the liner is adjusted so that the distance between the steps of the single-sided corrugated cardboard sheet becomes equal to the set step pitch.

  Further, since the CCD camera 46 is used as the image detection device, it is possible to easily and accurately detect the phase shift of the stage.

  More specifically, first, according to the corrugated cardboard manufacturing apparatus according to the embodiment of the present invention, as shown in FIGS. 7A and 7B, each double-sided corrugated cardboard sheet 12 (1 In the second sheet, the second sheet,..., The n-th sheet), the step phases of the core 2 in which the steps are formed in the direction orthogonal to the flow direction F1 are the same.

  Here, as shown in FIG. 8A, each double-sided corrugated cardboard sheet cut to length L by the cutter device 16 is a crease slotter device (not shown) of a box making machine (not shown). (Not shown), the ruled line 11b and the groove 15 are provided along the flow direction F2 orthogonal to the flow direction F1 in the above-described corrugated board sheet manufacturing apparatus. The positions of these ruled lines 11b, that is, the first to third ruled lines (each ruled line position) are the same in each double-sided cardboard sheet (first sheet, second sheet,..., N-th sheet) ( That is, they have the same phase). Therefore, the variation in the folding method at the position of each ruled line 11b in the folding process by the box making machine is reduced.

  As a result, the variation in the gap amount G (for example, the predetermined dimension 6 mm) of the bonding portion H shown in FIG. Thus, in the case of producing a cardboard box by using the double-sided cardboard sheet produced by the cardboard production apparatus according to the present embodiment, each double-sided cardboard sheet is cut into a predetermined length L by the cutter device, and then the box making process. In this case, the bonding accuracy of the corrugated cardboard sheet can be improved, and the box dimensions are made uniform.

  Further, according to the corrugated cardboard manufacturing apparatus of the embodiment of the present invention, before cutting the double-sided cardboard sheet 12, when the phase of the stepped mountain of the double-sided cardboard sheet 12 is deviated from the phase of the stepped mountain at the planned cutting position. Since this deviation amount is corrected within a predetermined range (within the cutting accuracy range of the cutter device 16), when each of the double-sided corrugated cardboard sheets 12 is cut at the cutting length L by the cutter device 16, the cutting portion Since the corrugated sheet has the same corrugation phase (corrugated mountain position), the corrugated sheets can be aligned at the same cutting position (see FIG. 7B). As a result, the bonding accuracy of the corrugated cardboard sheet can be further improved in the subsequent box making process.

  Furthermore, if the phase of the cut portion of the corrugated cardboard sheet cut by the cutter device 16 deviates greatly from the position of the ridge or valley portion (bonding location) of the step, the beard-like cutting waste hangs down from the cut portion. (See paragraph [0003] and FIG. 9 of JP-A-6-339894). According to the corrugated cardboard sheet manufacturing apparatus of the embodiment of the present invention, the cutting position by the cutter device can be aligned with the crest portion or trough portion of the step, so that it is possible to effectively prevent the occurrence of “beard”. Become.

DESCRIPTION OF SYMBOLS 1 Corrugated cardboard manufacturing apparatus 2 Core 4,10 Liner 6 Single-sided cardboard sheet 8 Single facer 9 Slit 11a, 11b Ruled line
12 Double-sided corrugated cardboard sheet 14 Double facer 15 Groove 16 Cutter device 16a Cutter 16b Electric motor 22 Liner base 38 Press roll 42 Rotating shaft 44 Brake controller 46, 50 CCD camera 48, 52 Image processor 54 Controller L Cutting length M Press mark P Step pitch T Tension F1 Sheet flow direction in corrugated board manufacturing equipment F2 Sheet flow direction in box making machine

Claims (7)

A cardboard sheet manufacturing apparatus for manufacturing a cardboard sheet for manufacturing a cardboard box by making a plurality of ruled lines by a box making machine and bending and joining at the positions of these ruled lines,
A single facer for producing a single-sided corrugated cardboard sheet by laminating a core and a liner on which steps of a predetermined step pitch are formed;
A double facer that produces a double-sided cardboard sheet by bonding another liner to a single-sided cardboard sheet;
A cutter device for cutting a double-sided cardboard sheet to a predetermined cutting length in the sheet flow direction,
The single facer calculates a step pitch value so that the cut length of the double-sided corrugated cardboard sheet is an integral multiple of the core step pitch, and a single-sided cardboard fed from the single facer. A step pitch detection device for detecting the step pitch of the sheet, and the step pitch of the single-sided corrugated cardboard sheet detected by the step pitch detection device is fed to the single facer so as to be equal to the step pitch set by the step pitch calculation device. And a tension adjusting device for adjusting the tension of the liner.   The above-mentioned corrugated pitch detection device is provided on the exit side of the single facer and detects an image of the surface of the single-sided cardboard sheet, and the image detected by the image detection device is processed to process the single-sided corrugated sheet sheet pitch And a cardboard sheet manufacturing apparatus according to claim 1. 3. The cardboard according to claim 2, wherein the single facer includes a press roll for pressing and bonding the liner to the core, and the image detecting device detects a press mark formed on the liner surface by the press roll. Sheet manufacturing equipment.   The cardboard sheet manufacturing apparatus according to claim 2, wherein the image detection device detects an image of a stepped mountain of a single-sided cardboard sheet.   The cardboard sheet manufacturing apparatus according to claim 2, wherein the image detection apparatus is a CCD camera.   Before the cutter device cuts the double-sided cardboard sheet, the phase of the double-sided cardboard sheet is detected, and the phase of the double-sided cardboard sheet is detected by the phase-phase detecting device. And a speed control device that controls the rotational speed of the cutter device and corrects the amount of deviation within a predetermined range when the phase is shifted from the phase of the stepped mountain. The cardboard sheet manufacturing apparatus according to any one of 5.   An image detection device for detecting an image of the surface of a double-sided corrugated cardboard sheet, and an image processing device for processing the image detected by the image detection device to detect the phase of the double-sided cardboard sheet And the corrugated board manufacturing apparatus according to claim 6.

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