JP3117630B2 - Defect detection method and apparatus for laminated plywood - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defect detection method for detecting defects such as cavities, nests, and decay on the back surface of a laminated plywood such as a flooring material, and a defect detection apparatus incorporating the defect detection method. .

[0002]

2. Description of the Related Art A conventional device of this kind is disclosed in Japanese Patent Laid-Open No. 4-69.
No. 557 discloses a defect detection device inside wood and Japanese Patent Application Laid-Open No.
No. 87781 discloses an ultrasonic inspection method for a laminated material. Japanese Patent Application Laid-Open No. Hei 4-69557 discloses an apparatus for detecting defects such as nodes and cracks generated inside wood by seeing through the interior of the wood with X-rays. This is a method of detecting a defect inside the laminated material from the attenuated state of the incident multiple reflection echo.

[0003]

However, Japanese Patent Application Laid-Open No. 4-69 / 1990
In the device for detecting defects in wood disclosed in Japanese Patent No. 557, all the defects in wood are detected, and only the defects on the back surface of the surface material cannot be detected. In addition, the ultrasonic inspection method for laminated materials disclosed in Japanese Patent Application Laid-Open No. 5-87781 is directed to a highly airtight and homogeneous material such as a steel plate or a resin. A method that focuses on the state of attenuation of ultrasonic waves, such as almost reflected light, cannot stably detect defects on the back surface of the surface material of the laminated plywood.

The present invention has been made in view of this point, and an object of the present invention is to provide a method and an apparatus for detecting a defect of a laminated plywood, which can stably detect a defect on the back surface of a surface material of the laminated plywood. Things.

[0005]

According to a first aspect of the present invention, there is provided a method for detecting a defect in a laminated plywood, comprising pressing a surface of the laminated plywood with a pressing roller and relatively moving the laminated plywood and the pressing roller. Detecting a behavior occurring in a pressing direction of the pressing roller, and detecting a defect on a back surface of a surface material of the laminated plywood.

According to a second aspect of the present invention, there is provided a method for detecting a defect in a laminated plywood according to the first aspect, wherein the surface of the laminated plywood which does not include a defective portion is painted with a painting roller. A method for detecting defects in plywood, wherein the roller diameter of the pressing roller is the same as the roller diameter of the coating roller, and the pressing force of the pressing roller is the same as the pressing force of the coating roller. is there.

According to a third aspect of the present invention, there is provided a method for detecting a defect in a laminated plywood, wherein the roller diameter of the pressing roller is smaller than the roller diameter of the coating roller. Is what you do.

According to a fourth aspect of the present invention, there is provided a method for detecting a defect in a laminated plywood according to the first or second aspect, wherein the pressing roller is divided into a plurality in the width direction. Is what you do.

According to a fifth aspect of the present invention, there is provided a method for detecting a defect in a laminated plywood according to the first or second aspect, wherein two pressing rollers having different pressing forces have the same surface of the laminated plywood. Pressing a part, detecting a behavior occurring in the pressing direction of the two pressing rollers, and detecting a defective portion based on a difference in behavior occurring in the pressing direction between the two pressing rollers. .

According to a sixth aspect of the present invention, there is provided a method for detecting a defect in a laminated plywood, the method for detecting a defect in a laminated plywood according to the first aspect, comprising detecting that the moving laminated plywood has been conveyed to a predetermined position. A pressing roller is moved to and brought into contact with the surface of the laminated plywood, a behavior occurring in a pressing direction of the pressing roller is detected, and a defect on the back surface of the surface material of the laminated plywood is detected. .

According to a seventh aspect of the present invention, there is provided a method for detecting a defect in a laminated plywood according to the sixth aspect, wherein the pressing roller moves the surface of the laminated plywood to the surface of the laminated plywood, Until it comes into contact with the plywood, it is performed at a slow speed, a strong pressing force is generated at the moment of contact with the laminated plywood, and the contact between the pressing roller and the laminated plywood is performed smoothly. is there.

According to a eighth aspect of the present invention, there is provided a method for detecting defects in a laminated plywood according to the second aspect, wherein the surface of the laminated plywood is pressed by a pressing roller, and the laminated plywood and the pressing roller are pressed. While relatively moving, the behavior occurring in the pressing direction of the pressing roller is sampled as a deviation, a difference process per unit time of the deviation is performed, the content of the defect is classified from the data, and the defect is further classified.
The degree of defect is quantified from the data and the absolute evaluation
It is characterized by detecting a defect on the back surface of the surface material of the laminated plywood as a constant index .

According to a ninth aspect of the present invention, there is provided a method for detecting a defect in a laminated plywood according to the eighth aspect, wherein defects on the back surface of the surface material of the laminated plywood are classified into three patterns. Detecting the defect on the back surface of the surface material of the laminated plywood by determining which of the three patterns the waveform of the defect candidate belongs to from the deviation signal of the behavior occurring in the pressing direction of the laminated plywood. It is.

According to a tenth aspect of the present invention, there is provided a method for detecting a defect in a laminated plywood according to the ninth aspect, wherein a plurality of pressing rollers are distributed in a width direction and the pressing direction of each pressing roller is changed. From the deviation signal of the behavior that occurs in
It is characterized by determining which of the three patterns the waveform of the defect candidate belongs to, and matching the determination results for each pressing roller to make a comprehensive determination.

[0015] In the method for detecting a defect in a laminated plywood according to claim 11 of the present invention, in the method for detecting a defect in a laminated plywood according to claim 10, the waveform of one defect candidate of the plurality of pressing rollers may be any one of three patterns. Even if it is determined that the pressure roller belongs to
If not, the evaluation index is set to zero and the evaluation
If the number zero continues for a predetermined time or more, it is diagnosed that a problem has occurred in the deflection sensor of the pressing roller, and the subsequent determination excludes the determination result of the pressing roller and determines the content of the diagnosis. It is characterized by notifying.

According to a twelfth aspect of the present invention, there is provided a method for detecting a defect in a laminated plywood according to the eighth aspect of the present invention. Pressing at the start and end of contact
It is characterized by observing a behavior occurring in the pressing direction of the roller and determining whether or not the pressing force of the pressing roller is normal by matching with a normal state.

According to a thirteenth aspect of the present invention, there is provided a method for detecting a defect in a laminated plywood according to the twelfth aspect, wherein a plurality of pressing rollers are distributed in a width direction, and a relative position between the laminated plywood and the pressing roller is determined. pressing roller contact start and contact end of the respective pressure roller of the laminated plywood movement direction
Observing the behavior that occurs in the pressing direction of taking a matching of behavior that occurs in the pressing direction for each press roller, in which the pressing force of the pressing roller, characterized in that to determine normal.

According to a fourteenth aspect of the present invention, there is provided a defect detecting apparatus for laminated plywood, comprising: a conveying means for conveying the laminated plywood at a constant speed; and a pressing roller for pressing the laminated plywood on the conveying means with a constant pressing force. Detecting means for detecting a behavior occurring in the pressing direction of the pressing roller, and a detecting device for detecting a defect on the back surface of the surface material of the laminated plywood from the behavior in the pressing direction of the pressing roller obtained by the detecting means, It is characterized by comprising a control device that sorts the laminated plywood into non-defective non-defective products and defective materials from the detection result of the detection device and transports the same to the next step.

According to a fifteenth aspect of the present invention, there is provided the laminated plywood defect detecting apparatus according to the fourteenth aspect, wherein the detecting means comprises a detecting head, a detecting head mounting base, a pressing roller mounting base, and a pressing roller. One end of the pressing roller mounting base is swingably pivoted to a detecting head mounting base provided in the pressing direction on the pressing roller mounting base, and a detecting head is formed at the other end, and a pressing portion is formed at an intermediate lower portion thereof. Rollers are installed rotatably,
The displacement of the detection head is detected by the displacement sensor.
Thus, a behavior occurring in the pressing direction of the pressing roller is detected.

The defect detecting device for laminated plywood according to claim 16 of the present invention is the defect detecting device for laminated plywood according to claim 14, wherein the surface of the laminated plywood is pressed by a pressing roller, and the laminated plywood and the pressing roller are pressed. By relatively moving, detecting the behavior of the pressing roller that occurs in the pressing direction, and detecting defects on the back surface of the surface material of the laminated plywood, using a pneumatic device to detect the occurrence of the pressing force in the defect detection of the laminated plywood Then, in synchronization with the conveyed laminated plywood, the pressing of the pressing roller against the laminated plywood, freely performing isolation, the pressing roller generated at the time of contact between the pressing roller and the laminated plywood It is characterized in that a region where a defect cannot be detected due to vibration is minimized.

The defect detecting device for laminated plywood according to claim 17 of the present invention is the defect detecting device for laminated plywood according to claim 14, wherein the surface of the laminated plywood is pressed by a pressing roller, and the laminated plywood and the pressing roller are pressed. By relatively moving, detecting the behavior of the pressing roller that occurs in the pressing direction, in the defect detection of the laminated plywood to detect the defect of the surface material back surface of the laminated plywood, using a magnetic device to generate the pressing force The pressing roller freely presses and separates the laminated plywood in synchronization with the conveyed laminated plywood, and the vibration of the pressing roller generated at the time of contact between the pressing roller and the laminated plywood The region where the defect cannot be detected is minimized.

The defect detecting apparatus for laminated plywood according to claim 18 of the present invention is the defect detecting apparatus for laminated plywood according to claim 14, wherein the surface of the laminated plywood is pressed by a pressing roller, and the laminated plywood and the pressing roller are pressed. By relatively moving, to detect the behavior of the pressing roller that occurs in the pressing direction, in the defect detection of the laminated plywood to detect the defect of the surface layer back surface of the laminated plywood, by the transport of the laminated plywood, from the upper surface of the bottom board product
To transfer the pressing roller smoothly to the upper surface of the plywood
The bottom plate is vertically slidable and vertically movable so that the contact between the pressing roller and the laminated plywood is smoothly performed, and the defect of the defect cannot be detected due to the vibration of the pressing roller generated at the time of the contact between the pressing roller and the laminated plywood. It is characterized in that generation of a region is prevented.

The defect detecting apparatus for laminated plywood according to claim 19 of the present invention is the defect detecting apparatus for laminated plywood according to claim 18, wherein the transport of the laminated plywood is performed on the basis of the upper surface, and the influence of the thickness of the laminated plywood. Without receiving the defect, it is possible to prevent occurrence of a defect undetectable area due to vibration of the pressing roller that occurs when the pressing roller contacts the laminated plywood.

The defect detecting apparatus for laminated plywood according to claim 20 of the present invention is the defect detecting apparatus for laminated plywood according to claim 14, wherein the rollers are arranged in parallel in the width direction of the pressing roller , and the warp in the width direction of the laminated plywood. And press the pressing roller
It is characterized by detecting a stable behavior occurring in a direction .

The defect detecting device for laminated plywood according to claim 21 of the present invention is the defect detecting device for laminated plywood according to claim 14, wherein a warp correcting roller for pressing the laminated plywood is provided separately from the pressing roller. It is characterized by correcting the warpage of the laminated plywood in the longitudinal direction and detecting a stable movement occurring in the pressing direction of the pressing roller .

The defect detecting apparatus for laminated plywood according to claim 22 of the present invention is the defect detecting apparatus for laminated plywood according to claim 21, wherein a roller belt is attached to a warp straightening roller for pressing the laminated plywood and a pressing roller for conveyance. It is characterized in that it detects a defect of the laminated plywood in a stable manner.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front view of a laminated plywood defect detection apparatus used in a laminated plywood defect detection method according to a first embodiment of the present invention. FIG. 2 is a sectional view of the laminated plywood used in the method for detecting a defect of the laminated plywood according to the embodiment. The present invention is a method for detecting defects 21 such as cavities, nests, decay, etc., on the back surface of a surface material 1a of a laminated plywood 1 to be coated by a coating roller, which cannot be found from the surface of the laminated plywood 1. First, an apparatus for detecting a defect of a laminated plywood used in the present invention will be described. As shown in FIG. 1, this device comprises a frame 7 and a detection head mounting base 3 fixed thereto.
And a pressing roller mounting base 2. The pressing roller mounting base 2 has an inverted substantially triangular shape, one end of an upper part thereof forms a detection head 5, and the other end of the upper part swings on the detection head mounting base 3. Attached to. The pressing roller 4 is rotatably attached to a lower portion of the pressing roller mounting base 2. A displacement sensor 6 is provided on the frame 7, and detects a distance between the displacement sensor 6 and the detection head 5. As the deflection sensor 6, a sensor represented by a semiconductor laser analog system, an ultrasonic system, an eddy current system, or the like is used. A spring 9 for pressing the pressing roller mounting base 2 to apply a pressing force to the pressing roller 4 is provided on the frame 7.
Is attached.

Hereinafter, a method for detecting a defect in a laminated plywood will be described. A conveyor 10 is provided below the detection device, and the laminated plywood 1 moves at a constant speed on the conveyor 10. Will push. The displacement sensor 6 always detects the distance between the displacement sensor 6 and the detection head 5. If there is a defect 21 on the back surface of the surface material 1 a of the laminated plywood 1, the surface in the vicinity is pushed by the pressing roller 4. The depression and the height of the pressing roller 4 decrease. As a result, the pressing roller mounting base 2 swings, amplifies the displacement of the height of the pressing roller 4 and transmits it to the detection head 5, which detects this by the deviation sensor 6 and detects a defect on the back surface of the surface material 1 a of the laminated plywood 1. 21 is detected.

FIGS. 3 and 4 are enlarged views of a main part of a laminated plywood defect detecting apparatus used in the laminated plywood defect detecting method according to the first embodiment of the present invention. FIG. 3 shows the case of a non-defective non-defective product, and FIG. 4 shows the case of a defective product. As can be seen from FIGS. 3 and 4, the distance between the deviation sensor 6 and the detection head 5 depends on whether the pressing roller 4
Since the surface L of the surface material 1a is depressed, the distance L when pressing 1 is larger than the distance L1 when pressing a good non-defective product of the surface material 1a. A surface material defect detection height threshold L2 is set between the distance L1 and the distance L, and the distance LL between the deviation sensor 6 and the detection head 5 detected by the deviation sensor 6 is compared with the threshold L2, If the distance LL is greater than or equal to the threshold value L2, it is determined that the defect 21 exists,
If the distance LL is smaller than the threshold value L2, it is determined that there is no defect and there is no defect.

In this case, since the diameter of the pressing roller 4 is the same as the diameter of the coating roller used in the coating process and the pressing force of the pressing roller 4 is the same as the pressing force of the coating roller, the appearance generated in the actual coating process is obtained. Defects that cause defective materials can be detected.

FIG. 5 is an enlarged view of the pressing roller 4 used in the method for detecting a defect of a laminated plywood according to the first embodiment of the present invention. FIG. 6 is an enlarged view of another pressing roller 4 used in the method for detecting a defect of a laminated plywood according to the first embodiment of the present invention. As shown in FIG. 6, the roller diameter of the pressing roller 4 is not limited to the same as the diameter of the coating roller, but may be smaller. In this case, even if it is a small defect 21, only the defect 21 is pressed and a part without defect is not pressed, so that the small defect 21 is detected and the surface material of the laminated plywood 1 is pressed with a smaller pressing force than the painting roller. Defects 21 on the back surface of 1a can be detected.

FIG. 7 is an enlarged view in the width direction of the pressing roller 4 used in the method for detecting a defect of a laminated plywood according to the first embodiment of the present invention. FIG. 8 is an enlarged view in the width direction of the pressing roller 4 used in the method for detecting a defect of a laminated plywood according to the second embodiment of the present invention. FIG. 8 shows a case where the pressing roller 4 shown in FIG. 7 is divided in the width direction of the laminated plywood. That is, in the case of FIG. 8, the same width as the pressing roller 4 shown in FIG. 7 is formed by a set of the pressing rollers 4a divided in the width direction of the laminated plywood. FIG.
In the case of (1), the width of the roller is smaller than that of FIG. 7, so that a more local defect 21 can be detected.

FIG. 9 is a front view of a laminated plywood defect detection apparatus used in the laminated plywood defect detection method according to the third embodiment of the present invention. This is similar to the defect detection device of FIG. 1 except that a detection head 5 is formed on the pressing roller mounting base 2 so that even if the behavior of the pressing roller 4 occurs, it is detected without amplification. The difference is that a spring 9 for applying a pressing force to the pressing roller 4 is included in the pressing roller mounting base 2. Other configurations are the same as those of the defect detection apparatus of FIG. 1 and can be used in substantially the same manner. However, the distance between the deviation sensor 6 and the detection head 5 is the distance L when the pressing roller 4 presses the defect 21 on the back surface of the surface material 1a of the laminated plywood 1 and the distance L1 when pressing the non-defective product of the surface material 1a. Unlike the case of FIG. 1, the surface layer material defect detection height threshold value L2 also needs to be set to a value different from the case of FIG.

FIG. 10 is a front view of a laminated plywood defect detecting apparatus used in the laminated plywood defect detecting method according to the fourth embodiment of the present invention. This is similar to the defect detection device of FIG. 1, except that the fixed detection head mounting base 3 and the pressing roller mounting base 2 are mounted in two places on the frame 7 in series in the traveling direction of the conveyor 10. Has been
The two pressing rollers 4a and 4b apply different pressing forces to the laminated plywood 1, and the distance LLa between the deflection sensor 6a and the detection head 5a is determined by the deflection sensor 6a, and the deflection sensor 6b is determined by the deflection sensor 6b. The point at which the distance LLb between the detection head 6b and the detection head 5b is detected is different. According to this apparatus, the same portion of the surface material 1a of the laminated plywood 1 is pressed by two pressing rollers 4a and 4b having different pressing forces. Hereinafter, a method for detecting a defect in a laminated plywood using this apparatus will be described. The laminated plywood 1 is moved at a constant speed on the conveyor 10, and the pressing roller 4 a having a larger pressing force in the forward direction of the conveyor 10 pushes the surface of a non-defective non-defective product, and the displacement sensor 6 a Is the displacement sensor 6a
And a distance T1 between the head and the detection head 5a. Next, first, the pressing roller 4b having a smaller pressing force at the back in the traveling direction of the conveyor 10 pushes the surface of a non-defective product having no defect, and the displacement sensor 6b determines the distance T2 between the displacement sensor 6b and the detection head 5b. To detect. Similarly, the distance between the deviation sensor 6a and the detection head 5a when the surface of the defect 21 is first pressed by the pressing roller 4a having the larger pressing force in front is T11,
The distance between the displacement sensor 6b and the detection head 5b when pressed by the pressing roller 4b with the smaller pressing force at the back is defined as T21. A method for processing these data will be described below. FIG. 11 is a graph showing the relationship between the distance between the deviation sensor detected by the deviation sensor and the detection head and the pressing force of the pressing roller. The vertical axis indicates the distance between the deviation sensors 6a, 6b detected by the deviation sensors 6a, 6b and the detection heads 5a, 5b, and the horizontal axis indicates the pressing force of the pressing rollers 4a, b. F1 is the case where the pressing roller 4a with the larger pressing force is pressed, and F2 is the case where the pressing roller 4b with the smaller pressing force is pressed.
It is when it is pushed with. In FIG. 11, the solid circles represent actual data, and the lines are data links. According to FIG. 11, the distance between the displacement sensor 6 and the detection head 5 is larger when the pressing force is large than when the pressing force is small, but the tendency is more remarkable for the defect 21 than for a non-defective non-defective product. That is, it can be seen that the depression of the defect 21 is more remarkable when the pressing force is large than when the pressing force is small.

FIG. 12 is a graph showing the relationship between the distance between the displacement sensor detected by the displacement sensor and the detection head and the position of the laminated plywood. The vertical axis is the displacement sensors 6a, 6b
Sensors 6a and 6b and detection head 5 detected by
The horizontal axis indicates the position of the laminated plywood 1. This is a graph in which the distance between the displacement sensors 6a, 6b detected by the displacement sensors 6a, 6b and the detection heads 5a, 5b is continuously detected. According to FIG.
It can be seen that (T11-T21) is much larger than (T2). This indicates that the difference in the behavior of the pressing rollers 4a and 4b due to the different pressing forces F1 and F2 appears remarkably in the defect 21.

FIG. 13 shows the relationship between the difference between the distance between the displacement sensor detected by the displacement sensor and the position of the detection head when pressed by the pressing roller 4a and when pressed by the pressing roller 4b, and the position of the laminated plywood. FIG. The vertical axis indicates the difference between the distance between the deviation sensor 6 and the detection head 5 detected by the deviation sensor 6 when pressed by the pressing roller 4a and when pressed by the pressing roller 4b, and the horizontal axis indicates the distance of the laminated plywood 1. Indicates the position. This is the case where the pressing roller 4a presses the pressing roller 4a.
It is the graph which detected continuously the difference of the distance of the deflection sensor and the detection head which are detected by the deflection sensor at the time of pushing with b. As shown in FIG. 13, (T11-T21) and (T11
1-T2), a surface material defect detection height threshold value T3 is set. The surface material defect detection height threshold value T3 is indicated by a dashed line in FIG. The distance LLa detected by the displacement sensor 6a and the distance LLb detected by the displacement sensor 6b
Is compared with the threshold value T3, and if TT is greater than or equal to the threshold value T3, it is determined to be a defect 21, and if TT is smaller than the threshold value T3, it is determined to be a defect-free product. I do.

As described above, the defects 21 on the back surface of the surface material 1a at the same location on the surface of the laminated plywood 1 are detected by the plurality of pressing rollers 4a and 4b having different pressing forces, and the data processing as described above is performed. In this case, noise caused by dust and dirt on the surface of the laminated plywood 1 and the influence of warpage of the laminated plywood 1 can be removed, and more reliable detection can be performed. By this method, the defect 21 on the back surface of the surface material 1a of the laminated plywood 1 can be stably detected.

FIG. 14 is a block diagram of a laminated plywood defect detecting apparatus according to a first embodiment of the present invention. This incorporates the defect detecting device for laminated plywood shown in FIG. 1, and the method for detecting defects in laminated plywood is the same as that in FIG. Hereinafter, this device will be described. As shown in FIG. 14, this apparatus places the laminated plywood 1 on the conveyors 10a, 10b, and 10c and transports the laminated plywood at a constant speed. 21 is detected, those containing the defect 21 are regarded as defective materials, and those not containing the defect 21 are regarded as non-defective non-defective products. What to send. The width of the pressing roller 4 is slightly larger than that of the laminated plywood 1 and pushes the entire portion of the laminated plywood 1. The roller diameter of the pressing roller 4 is the coating roller 1 in the coating process.
2, the laminated plywood 1 can be pressed with the same pressing force as the coating roller 12, so that the defect 21 which is a cause of a defective appearance material occurring in the subsequent coating process can be detected.

First, the laminated plywood 1 on the conveyor 10a is pressed by the pressing roller 4 with a constant pressing force.
Is measured in the pressing direction. That is, the distance L between the deviation sensor 6 and the detection head 5 is measured by the deviation sensor 6 and transmitted to the defect detection device 15, where the distance L and the surface material defect detection height threshold L2 are set. The defect 21 is detected by comparing the defect number with the defect number, and the determination result of the defect material and the non-defective non-defective product is transmitted to the non-defective non-defective and defective material selection control device 17. At the same time, the laminated plywood 1 is transported onto the transport conveyor 10b. A material detection sensor 13 is provided above the conveyor 10b. The material detection sensor 13 detects that the laminated plywood 1 has arrived on the conveyor 10b, and sends the detected signal to the material transport controller 16
And stop the laminated plywood 1 here. On the other hand, if the non-defective non-defective and defective material selection control device 17 obtains the result of the determination that there is no defect, it sends a signal to the material conveyance control device 16 to move the laminated plywood 1 from the upper side of the conveyor 10b to the upper side of the conveyor 10c. , And is coated by the coating roller 12.

The coating roller 12 and the conveyor 10
c, the coating material is applied to the surface of the laminated plywood 1 by sandwiching the laminated plywood 1 between them. The roller diameter of the coating roller 12 is the same as that of the pressing roller 4, and the surface of the laminated plywood 1 is coated with the same pressing force as that of the coating roller 12 by sandwiching the laminated plywood 1.

On the other hand, the non-defective non-defective / defective material sorting control device 17 sends a signal to the take-out robot 14 to take out the laminated plywood 1 when the judgment result that the laminated plywood 1 on the conveyor 10b is a defective material. . The robot 14 includes an arm 18 and a suction plate 19, and moves the arm 18 three-dimensionally to form the arm 1
The adsorbing plate 19 provided at the tip of 8 is moved to a predetermined position, and the laminated plywood 1 is adsorbed on the adsorbing plate 19 and moved. According to the signal, the robot 14 takes out the laminated plywood 1 on the conveyor 10b.
9 and is moved to a defective material stocker 20 installed in another place. The same displacement sensor 6 as that in FIG. 1 was used. With this apparatus, the defect 21 on the back surface of the surface material 1a of the laminated plywood 1 can be stably detected, and a non-defective non-defective product and a defective material are selected.
Only non-defective non-defective products can be reliably sent to the next process.

FIG. 15 is a front view of the laminated plywood defect detecting apparatus used in the laminated plywood defect detecting method according to the first embodiment of the present invention, and shows a state where the pressing roller 4 and the laminated plywood 1 are in contact with each other. Things. As shown in FIG. 15, the detection head 5 vibrates due to a shock when the end face of the laminated plywood 1 conveyed on the conveyor 10 and the pressing roller 4 come into contact with each other. In a certain range, an area where a defect cannot be detected occurs.

FIG. 16 is a graph showing the relationship between the distance between the displacement sensor detected by the displacement sensor and the detection head and the detection time. The vertical axis indicates the distance between the deflection sensor detected by the deflection sensor and the detection head, and the horizontal axis indicates the detection time. t1 is a point in time when the pressing roller 4 contacts the end face of the laminated plywood 1, and t2 is a point in time when the vibration of the detection head 5 is converged and the operation of the detection head 5 is stabilized. As shown in FIG. 16, since the detection head 5 vibrates between t1 and t2, the defect 21 of the laminated plywood 1 cannot be detected.

FIG. 17 is a structural view showing a region where a defect cannot be detected in the laminated plywood 1. As shown in FIG. The arrow shown in FIG. 17 is the transport direction, and the hatched portion is the defect undetectable area.

FIG. 18 is a front view of a laminated plywood defect detecting apparatus used in the laminated plywood defect detecting method according to the fifth embodiment of the present invention. This defect detection device is similar to the case of FIG. 1, but includes a pneumatic device such as an air cylinder 22 instead of the spring 9, and generates a pressing force using the air cylinder 22. The difference is that a laminated plywood detection sensor 33 is provided on the conveyor 10. Other configurations are the same as those in FIG. In this case, the pressing roller 4 is moved up and down in synchronization with the conveyed laminated plywood 1 with the air cylinder 22 to freely press and isolate the pressing roller 4 against the laminated plywood 1, and the pressing roller 4 and the laminated plywood 1 are separated from each other. By reducing the shock generated at the time of contact, the area where a defect cannot be detected is minimized. The air cylinder 2
By using a pneumatic device such as 2, the adjustment and change of the pressing force can be easily performed by adjusting the inflow air pressure.
In addition, by detecting the inflowing air pressure with a pressure sensor, it is possible to manage whether or not an appropriate pressure is maintained, and a highly reliable defect detection method for the laminated plywood 1 can be provided.

Hereinafter, a method for detecting a defect in the laminated plywood will be described. FIGS. 19A, 19B and 19C are front views of a laminated plywood defect detection apparatus used in the laminated plywood defect detection method according to the fifth embodiment of the present invention.
19B shows a state immediately before the end surface of the laminated plywood 1 comes into contact with the pressing roller 4, FIG. 19B shows a state immediately after the end surface of the laminated plywood 1 comes into contact with the pressing roller 4, and FIG.
And a state immediately after the end face of the laminated plywood 1 is separated.

As shown in FIGS. 19A, 19B and 19C,
When the conveyed laminated plywood 1 is detected by the laminated plywood detection sensor, the detection head 5 is lowered by the air cylinder 22. At this time, by appropriately controlling the air pressure flowing into the air cylinder 22, the contact between the pressing roller 4 and the laminated plywood 1 is made soft and the end face of the laminated plywood 1 is brought into contact with the pressing roller 4 and the laminated plywood 1. The region where a defect cannot be detected due to the vibration of the detection head 5 generated at the time of the contact 1 is minimized.

As a method of controlling the air pressure when the pressing roller 4 is brought into contact with the laminated plywood 1, first, the detection head 5 is lowered with a relatively small air pressure. Next, the lowering state is sensed by the displacement sensor 6, and the contact point between the pressing roller 4 and the laminated plywood 1 is detected. After the contact, the laminated plywood 1 is pressed with a relatively large air pressure for a certain period of time. Next, the laminated plywood 1 is pressed with an appropriate air pressure, that is, a pressing force, and the defects 21
Is detected.

The contact between the pressing roller 4 and the laminated plywood 1 with a relatively small air pressure as described above relieves and absorbs the shock at the time of the contact. At the point of contact, the detection is performed by pressing with a relatively large air pressure. The vibration of the head 5 is suppressed, and thereafter the head 5 is pressed with an appropriate air pressure to detect the defect 21 of the laminated plywood 1.

Next, when the end of the laminated plywood 1 conveyed by the laminated plywood detection sensor 33 is detected, the detection head 5
To rise.

FIG. 20 is a graph showing the relationship between the distance between the deflection sensor detected by the deflection sensor and the detection head and the detection time. The vertical axis indicates the distance between the deflection sensor detected by the deflection sensor and the detection head, and the horizontal axis indicates the detection time. tt1 is the time when the detection head 5 starts to descend,
tt2 is the point of contact between the pressing roller 4 and the laminated plywood 1,
This is the time when the change in the distance detected by the displacement sensor 6 becomes zero. Therefore, in this case, there is almost no defect undetectable area.

FIG. 21 is a front view of a laminated plywood defect detection apparatus used in the laminated plywood defect detection method according to the sixth embodiment of the present invention. This defect detection device is similar to the case of FIG. 18 except that a magnetic force device such as a voice coil motor 23 is provided instead of the air cylinder 22 and the voice coil motor 23 is used to generate a pressing force. Are different. Other configurations are the same as those in FIG.

In this case, similarly to the case where pneumatic equipment such as the air cylinder 22 is used, the pressing roller 4 and the laminated plywood 1 are used.
The structure is such that a shock generated at the time of contact is reduced, and the defect undetectable region is minimized. By using a magnetic device such as the voice coil motor 23, it is possible to easily adjust or change the pressing force by appropriately controlling the current for controlling the magnetic device.

In this case, the cost for detecting the defect 21 is increased by using a magnetic device as compared with the case where a pneumatic device such as the air cylinder 22 is used. The control of the lowering of the detection head 5 and the control of the pressing force when the laminated plywood 1 is brought into contact with the laminated plywood 1 can be performed finely and at high speed, and the defect detection due to the vibration of the detection head 5 generated when the pressing roller 4 contacts the laminated plywood 1 The area can be further minimized.

Hereinafter, a method for detecting a defect in the laminated plywood will be described. FIGS. 22 (a), 22 (b) and 22 (c) are front views of a laminated plywood defect detection apparatus used in the laminated plywood defect detection method according to the sixth embodiment of the present invention.
22B shows a state immediately before the end surface of the laminated plywood 1 comes into contact with the pressing roller 4, FIG. 22B shows a state immediately after the end surface of the laminated plywood 1 comes into contact with the pressing roller 4, and FIG.
And a state immediately after the end face of the laminated plywood 1 is separated.

As shown in FIGS. 22 (a), (b) and (c),
Laminated plywood 1 conveyed by the laminated plywood detection sensor 33
Is detected, the detection head 5 is lowered by the voice coil motor 23. At this time, by appropriately controlling the current to the voice coil motor 23 and making the contact between the pressing roller 4 and the laminated plywood 1 soft and in contact with the end face of the laminated plywood 1, the pressing roller 4 and the laminated plywood 1 The region where the defect cannot be detected due to the vibration of the detection head 5 generated at the time of the contact is minimized.

Next, a defect 21 of the laminated plywood 1 is detected at an appropriate current value, that is, a pressing force. Next, the detection head 5 is raised when the end of the conveyed laminated plywood 1 is detected by the laminated plywood detection sensor. FIG. 23 is a front view of a laminated plywood defect detection device used in the laminated plywood defect detection method according to the seventh embodiment of the present invention. This defect detection device is similar to the case of FIG. 1, except that the pressing plate 4 is provided with a floor plate 24, and the floor plate 24 is slid by transporting the laminated plywood 1. 1 in that the contact 1 is performed smoothly. Other configurations are the same as those in FIG.

In this case, between the conveyor 10 and the pressing roller 4, there is provided a floor plate 24 which can slide in the conveying direction of the laminated plywood 1 and can move up and down in the vertical direction.
The pressing plate 4 is smoothly transferred from the floor plate 24 to the laminated plywood 1 by the configuration in which the floor plate 24 is slid by the conveyance of the sheet. The occurrence of the undetectable area is prevented and the pressure roller 4 is prevented from being damaged.

The floor plate 24 can be moved up and down, and the pressing force can be easily set by providing a pressing sensor for detecting the pressing force of the pressing roller 4 on the floor plate 24 itself.

Hereinafter, a method for detecting a defect in the laminated plywood will be described. FIGS. 24 to 29 are configuration diagrams of a laminated plywood defect detection apparatus used in the laminated plywood defect detection method according to the seventh embodiment of the present invention.

First, by transporting the laminated plywood 1, the floor board 24 slides in the transport direction. This state is shown in FIG. Next, the pressing roller 4 moves from the floor board 24 to the laminated plywood 1. This state is shown in FIG. Next, when the pressing roller 4 completely moves onto the laminated plywood 1 and the floor plate 24 reaches the slide limit, the floor plate slide limit sensor 25 is input. This state is shown in FIG. Next, the floor plate 24 is lowered by the floor plate vertical cylinder 26 according to the input of the floor plate limit sensor 25. With the lowering of the floor plate 24, the floor plate 24 starts to return to the initial position by the floor plate spring 27 attached to the floor plate 24. This state is shown in FIG. Then, the conveyance of the laminated plywood 1 is completed, and the pressing roller 4 is moved by the deviation sensor 6 to the conveyance conveyor 10.
When it is detected that the ground has contacted the ground, the floor plate 24 is raised by the floor plate vertical cylinder 26, the pressing roller 4 is lifted and returned to the initial position, and the conveyance of the next laminated plywood 1 is awaited. This state is shown in FIGS. 28 and 29.

FIG. 30 is a graph showing the relationship between the distance between the deflection sensor detected by the deflection sensor and the detection head and the detection time. The vertical axis indicates the distance between the deflection sensor detected by the deflection sensor and the detection head, and the horizontal axis indicates the detection time. t1 is the time when the pressing roller 4 is grounded to the conveyor 10 and the distance detected by the deviation sensor 6 is the thickness of the laminated plywood 1, so that it is detected that the pressing roller 4 is grounded to the conveyor 10 Then, the end of the conveyance of the laminated plywood 1 is determined.

FIG. 31 is a front view of a laminated plywood defect detecting apparatus used in the laminated plywood defect detecting method according to the eighth embodiment of the present invention. This defect detection device is similar to the case of FIG. 23, except that the transport of the laminated plywood 1 is performed with reference to the upper surface so that the thickness of the laminated plywood 1 is different, and the plywood 24 of the pressing roller 4 varies from the plywood 1 to the laminated plywood 1. By eliminating the step at the time of the transfer and smooth transition, the shock at the time of the contact between the pressing roller 4 and the laminated plywood 1 is eliminated, preventing the occurrence of a defect undetectable area and preventing the roller of the pressing roller 4 from being damaged. doing. The floor plate 24 is vertically movable. In this case, the laminated plywood 1 is lifted by the laminated plywood lifting spring 28 and is transported by the transport roller 29 so that the upper surface reference of the laminated plywood 1 with the upper surface reference guide rail 30 as a reference surface is performed.

Hereinafter, a method for detecting a defect in the laminated plywood will be described. FIG. 31 is a front view of a laminated plywood defect detection apparatus used in the laminated plywood defect detection method according to the eighth embodiment of the present invention. 32 to 37 are configuration diagrams of a laminated plywood defect detection device used in the laminated plywood defect detection method according to the same embodiment.

First, when the laminated plywood 1 is transported, the floor board 24 slides in the transport direction. This state is shown in FIG. Next, the pressing roller 4 moves from the floor board 24 to the laminated plywood 1. This state is shown in FIG. Next, when the pressing roller 4 completely moves onto the laminated plywood 1 and the floor plate 24 reaches the slide limit, the floor plate slide limit sensor 25 is input. This state is shown in FIG. Next, the floor plate 24 is lowered by the floor plate vertical cylinder 26 according to the input of the floor plate limit sensor 25. With the lowering of the floor plate 24, the floor plate 24 starts to return to the initial position by the floor plate spring 27 attached to the floor plate 24. This state is shown in FIG. Then, the conveyance of the laminated plywood 1 is completed, and the pressing roller 4 is moved by the deviation sensor 6 to the conveyance conveyor 10.
When it is detected that the ground has contacted the ground, the floor plate 24 is raised by the floor plate vertical cylinder 26, the pressing roller 4 is lifted and returned to the initial position, and the conveyance of the next laminated plywood 1 is awaited. This state is shown in FIGS. 36 and 37.

FIG. 38 is a front view of a laminated plywood defect detection apparatus used in the laminated plywood defect detection method according to the ninth embodiment of the present invention. FIG. 39 is a side view of a laminated plywood defect detection apparatus used in the laminated plywood defect detection method according to the same embodiment. This defect detection device is similar to the case of FIG. 1, except that a plurality of rollers having different roller diameters are attached to the pressing roller 4 in parallel. Other configurations are the same as those in FIG.

In this case, as shown in FIG. 39, the laminated plywood 1 having a larger roller diameter is provided in parallel with both sides of the pressing roller 4 used for detecting the defect 21 disposed at the center.
A pressing roller 4 used for correcting the warpage is disposed.
The defects 21 can be detected while correcting the warp of the laminated plywood 1 by the plurality of pressing rollers 4.

FIG. 40 is a graph showing the relationship between the deviation of the pressing roller and the detection time (when warpage is not corrected). The vertical axis shows the deviation of the pressing roller, and the horizontal axis shows the detection time. As shown in FIG. 40, due to the influence of the deviation 31 due to the warpage of the laminated plywood 1, the deviation 3 due to the defect 21 of the laminated plywood 1 is obtained.
2 cannot be detected accurately.

FIG. 41 is a graph showing the relationship between the deviation of the pressing roller and the detection time (when warpage is corrected).
The vertical axis shows the deviation of the pressing roller, and the horizontal axis shows the detection time. As shown in FIG. 41, in this case, the deviation 32 due to the defect 21 of the laminated plywood 1 can be accurately detected.

Next, a method for detecting defects in laminated plywood according to a tenth embodiment of the present invention will be described. FIG. 42 shows a waveform obtained by sampling a behavior occurring in a pressing direction of a pressing roller used in the method for detecting a defect of a laminated plywood according to the first embodiment of the present invention as a deviation. FIGS. 43 (a) and (b)
(C) shows a defect pattern. 42 and 43, the vertical axis indicates the deviation of the pressing roller, and the horizontal axis indicates the detection time. FIG. 44 shows a table (for evaluation evaluation index calculation).

In this defect detection method, as shown in FIG. 42, first, the surface of the laminated plywood 1 is pressed by the pressing roller 4 and the pressing roller 4 is moved while the laminated plywood 1 and the pressing roller 4 are relatively moved. The behavior occurring in the pressing direction is sampled as a deviation, and the deviation is subjected to difference processing per time to extract a waveform and a characteristic of a defect candidate.

Next, h, h / t, t shown in FIG.
The degree of defect is quantified using parameters such as
An evaluation judgment index is calculated using the table of (1). In this case, when the evaluation judgment index is 5 or more, it is a defective material, and when the evaluation judgment index is 4 or less, it is a good product having no defect 21.
Note that h in FIG. 44 does not necessarily have to be at regular intervals,
The setting may be made in consideration of the frequency. Thus, the defect 21 can be quantitatively detected.

Further, as shown in FIG. 43, defects are classified into three patterns. FIG. 43A shows a pattern A, and the feature of the pattern A is a protruding signal. FIG. 43B shows a pattern B, and the feature of the pattern B is a concave signal. FIG. 43C shows a pattern C, and the feature of the pattern C is an abnormal vibration (unevenness) signal. Then, it is determined to which of the three patterns the waveform of the defect candidate belongs. If the waveform belongs to any of the three patterns, it is determined that the defect material is defective. By patterning the waveform of the defect candidate in this manner, the defect 21 can be easily detected.

FIG. 45 is a sectional view of a pressing roller used in a method for detecting a defect of a laminated plywood according to an eleventh embodiment of the present invention. In this defect detection method, nine pressing rollers 4 are distributed in the width direction, and NO. 1 to NO. Nine pressing rollers 4 are determined, and from the deviation signal of the behavior of each pressing roller 4, it is determined which of the three patterns the waveform of the defect candidate belongs to, and matching of the determination results for each pressing roller 4 is performed. To make a more accurate overall judgment. Specific examples are shown below.

[0075]

[Table 1]

[0076]

[Table 2]

Table 1 shows an example of the defect 21 of the pattern A.
In this case, NO. Pattern A is recognized except for the pressing roller 4 of No. 5, and each evaluation judgment index is 5 or more. The pressing roller 4 of No. 5 determines that noise is present, and determines that the laminated plywood 1 is a defective material.

Table 2 shows NO. 3, NO. 5, NO. Since the evaluation judgment index is 0 except for No. 9, NO. 3, NO. 5,
NO. 9 is determined to be noise, and the laminated plywood 1 has a defect 21
It is determined that there is no defective product.

Further, in this defect detection method, N
O. 1 to NO. Even when the waveform of one defect candidate among the nine pressing rollers 4 is determined to belong to any of the three patterns, the pressing roller 4 continuously showed the evaluation determination index of 0. In such a case, it is diagnosed that a problem has occurred in the deviation sensor 6 of the pressing roller 4, and the subsequent determination excludes the determination result of the pressing roller 4 and notifies the content of the diagnosis. Specific examples are shown below.

[0080]

[Table 3]

[0081]

[Table 4]

[0082]

[Table 5]

Table 3 shows the defect 21 of the pattern A, Table 4 shows the defect 21 of the pattern B, and Table 5 shows the defect 21 of the pattern C. Since only the pressing roller 4 of No. 3 continuously shows the evaluation judgment index of 0, NO. 3 pressing rollers 4
Is diagnosed as having a problem, and the contents of the diagnosis are notified.

Next, a method for detecting defects in laminated plywood according to a twelfth embodiment of the present invention will be described. This defect detection method observes the behavior of the pressing roller 4 and the laminated plywood 1 at the start and end of the contact in the relative movement direction of the laminated plywood 1 and the pressing roller 4, and matches the pressing roller 4 with the normal state. It is determined whether or not the pressing force is normal.

FIG. 46 shows a waveform obtained by sampling the behavior occurring in the pressing direction of the pressing roller used in this defect detection method as deviation. The left end in FIG. 46 indicates a contact start point, and whether or not the pressing force of the pressing roller 4 is normal can be determined mainly by the value of ho in FIG.

FIG. 47 is a conceptual diagram showing a method for detecting defects in laminated plywood according to a thirteenth embodiment of the present invention. As shown in FIG. 47, in this defect detection method, a plurality of pressing rollers 4 are distributed in the width direction, and the contact between each pressing roller 4 and the laminated plywood 1 in the relative movement direction of the laminated plywood 1 and the pressing roller 4. The behavior at the start and at the end of the contact was observed, and each pressing roller 4
46 is compared with ho in FIG. 46, matching is achieved, and it can be more accurately determined whether or not the pressing force of the pressing roller 4 is normal.

Table 6 shows a series of flows of the method for detecting defects in laminated plywood according to the tenth to thirteenth embodiments of the present invention.

[0088]

[Table 6]

FIGS. 48 (a), (b) and (c) are cross-sectional views of a defect detecting apparatus for laminated plywood according to a fourteenth embodiment of the present invention. FIG. 48A shows a state in which the laminated plywood 1 is located before the pressing roller 4. FIG. 48B shows a state in which the laminated plywood 1 has started to contact the pressing roller 4. FIG. 48 (c)
Indicates a state in which the laminated plywood 1 is pressed by the pressing roller 4. The rollers at the left and right ends in FIGS. 48 (a), (b), and (c) are drive rollers.

FIGS. 48 (a), (b) and (c) show the defect detection apparatus shown in FIG. 14 in which a warp correcting roller 34 for holding the laminated plywood 1 is provided separately from the pressing roller 4. The other configuration is the same as that of the defect detection apparatus shown in FIG. The warp correcting roller 34 corrects the warpage of the laminated plywood 1 in the longitudinal direction, and detects a stable behavior of the defect 21 of the laminated plywood 1. The number of the correction rollers 34 may be one or plural.

FIG. 49 is a sectional view of a laminated plywood defect detecting apparatus according to a fifteenth embodiment of the present invention. This defect detection device is similar to the defect detection device of FIG. 48 except that a roller belt 35 is attached to the correction roller 34 and the pressing roller 4 to form a transport belt, and the laminated plywood 1 is held down by the roller belt 35. Is different. In this case, since noise-like vibration is unlikely to occur, the defect 21 of the laminated plywood 1 can be stably detected while the warpage of the laminated plywood 1 is more reliably corrected.

[0092]

According to the method for detecting a defect of a laminated plywood according to the first aspect of the present invention, it is possible to continuously and stably detect a defect on the back surface of a surface material of a laminated plywood on a production line.

The method for detecting a defect in a laminated plywood according to the second aspect of the present invention is the same as the method for applying a coating to the surface of the laminated plywood using a coating roller, in addition to the effect of the method for detecting a defect in a laminated plywood according to the first aspect. Under the above conditions, a defect on the back surface of the surface material of the laminated plywood can be detected.

The defect detecting method for laminated plywood according to the third aspect of the present invention can detect small defects in addition to the effect of the defect detecting method for a laminated plywood according to the first aspect. Further, it is possible to detect a defect on the back surface of the surface material of the laminated plywood with a smaller pressing force than the painting roller.

The defect detecting method for laminated plywood according to the fourth aspect of the present invention can detect more localized defects in addition to the effect of the defect detecting method for a laminated plywood according to the first aspect.

According to the fifth aspect of the present invention, in addition to the effect of the first aspect of the present invention, there is provided a method for detecting a defect of a surface material of a laminated plywood. Can be raised.

The defect detecting method for laminated plywood according to claim 6 of the present invention has the effect of reducing the shock generated at the time of contact between the pressing roller and the laminated plywood in addition to the effect of the defect detecting method for laminated plywood according to claim 1. In addition, the area where a defect cannot be detected can be minimized.

According to a seventh aspect of the present invention, there is provided a method for detecting a defect in a laminated plywood, in addition to the effect of the method for detecting a defect in a laminated plywood according to the sixth aspect. The shock generated at the time of contact can be alleviated, and the region where a defect cannot be detected can be minimized.

The defect detection method for laminated plywood according to the eighth aspect of the present invention provides a method for detecting defects on the surface material of a laminated plywood quantitatively, in addition to the effect of the defect detection method for a laminated plywood according to the second aspect. It can be carried out.

The defect detection method for laminated plywood according to the ninth aspect of the present invention provides the effect of the defect detection method for a laminated plywood according to the eighth aspect, and further facilitates lamination by patterning the waveform of the defect candidate. Defects on the back surface of the surface material of the plywood can be detected.

According to the tenth aspect of the present invention, in addition to the effect of the plywood defect detecting method according to the ninth aspect, in addition to the effect of the plywood defect detecting method according to the ninth aspect, a plurality of pressing rollers in the width direction can be used to more accurately laminate plywood. Can be detected on the back surface of the surface material.

The defect detecting method for laminated plywood according to the eleventh aspect of the present invention, in addition to the effect of the defect detecting method for a laminated plywood according to the tenth aspect, eliminates the result of judging a defective pressing roller. Can be detected on the back surface of the surface material.

According to the defect detecting method for laminated plywood according to the twelfth aspect of the present invention, in addition to the effect of the defect detecting method for laminated plywood according to the eighth aspect, it is determined whether or not the pressing force of the pressing roller is normal. Can be.

According to the thirteenth aspect of the present invention, in addition to the effect of the laminated plywood defect detecting method according to the twelfth aspect, in addition to the effect of the laminated plywood defect detecting method according to the twelfth aspect, a plurality of pressing rollers in the width direction can be used for the pressing roller more accurately. It can be determined whether or not the pressing force is normal.

The defect detecting apparatus for laminated plywood according to the fourteenth aspect of the present invention can continuously and stably detect defects on the back surface of the surface material of laminated plywood on a production line, and waste only non-defective non-defective products. It can be painted without.

The defect detecting device for laminated plywood according to claim 15 of the present invention, in addition to the effect of the defect detecting device for laminated plywood according to claim 14, when the behavior of the pressing roller occurs, it is amplified and detected. . Therefore, even a small defect can be detected.

The defect detecting device for laminated plywood according to claim 16 of the present invention has the effect of generating a pressing force by using a pneumatic device in addition to the effect of the defect detecting device for laminated plywood according to claim 14. The adjustment and change of the pressing force can be easily performed, and the area where the defect cannot be detected can be minimized.

The defect detecting apparatus for laminated plywood according to the seventeenth aspect of the present invention has the same effect as the defect detecting apparatus for laminated plywood according to the fourteenth aspect, and furthermore, generates a pressing force by using a magnetic force device. Adjustment and change of the pressure can be performed more easily, and the region where the defect cannot be detected can be further minimized.

The defect detecting apparatus for laminated plywood according to the eighteenth aspect of the present invention has the same effect as the defect detecting apparatus for laminated plywood according to the fourteenth aspect, and furthermore, by sliding the plywood by transporting the laminated plywood, and pressing the pressing roller. By making the transition from the floorboard to the laminated plywood, it is possible to prevent the occurrence of a defect undetectable region.

The defect detecting device for laminated plywood according to the nineteenth aspect of the present invention has the same effect as that of the defect detecting device for laminated plywood according to the eighteenth aspect, and further comprises the step of transporting the laminated plywood on the basis of the upper surface. By removing the step when transferring the plywood from the floorboard to the laminated plywood, and smoothly transferring the plywood, it is possible to prevent generation of a defect undetectable region.

The defect detecting device for laminated plywood according to claim 20 of the present invention can detect defects while correcting warpage of laminated plywood in addition to the effect of the defect detecting device for laminated plywood according to claim 14. it can.

The defect detecting apparatus for laminated plywood according to claim 21 of the present invention can detect defects while correcting warpage of laminated plywood in addition to the effect of the defect detecting apparatus for laminated plywood according to claim 14. it can.

The defect detecting device for laminated plywood according to claim 22 of the present invention has the same effect as the defect detecting device for laminated plywood according to claim 21, and further reliably corrects the warpage of the laminated plywood by a roller belt. Defects can be detected.

[Brief description of the drawings]

FIG. 1 is a front view of a defect detection device used in a method for detecting a defect of a laminated plywood according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the laminated plywood used in the method for detecting a defect of the laminated plywood.

FIG. 3 is an enlarged view of a main part of the defect detection apparatus used in the method for detecting a defect of a laminated plywood according to the first embodiment.

FIG. 4 is an enlarged view of a main part of the defect detection device used in the defect detection method for laminated plywood according to the first embodiment.

FIG. 5 is an enlarged view of a pressing roller used in the method for detecting a defect of a laminated plywood according to the first embodiment.

FIG. 6 is an enlarged view of another pressing roller used in the method for detecting a defect of a laminated plywood according to the first embodiment.

FIG. 7 is an enlarged view in the width direction of a pressing roller used in the method for detecting a defect of a laminated plywood according to the first embodiment.

FIG. 8 is an enlarged view in the width direction of a pressing roller used in a method for detecting a defect of a laminated plywood according to a second embodiment of the present invention.

FIG. 9 is a front view of a laminated plywood defect detection apparatus used in the laminated plywood defect detection method according to the third embodiment of the present invention.

FIG. 10 is a front view of a laminated plywood defect detection device used in a laminated plywood defect detection method according to a fourth embodiment of the present invention.

FIG. 11 is a graph showing a relationship between a distance between a deflection sensor and a detection head and a pressing force of a pressing roller.

FIG. 12 is a graph showing a relationship between a distance between a deflection sensor and a detection head and a position of a laminated plywood.

FIG. 13 is a graph showing a relationship between a difference between a distance between a deflection sensor and a detection head and a position of a laminated plywood.

FIG. 14 is a configuration diagram of a laminated plywood defect detection apparatus according to the first embodiment of the present invention.

FIG. 15 is a front view of a defect detection device used for the defect detection method for laminated plywood according to the first embodiment of the present invention.

FIG. 16 is a graph showing the relationship between the distance between the deflection sensor detected by the deflection sensor and the detection head and the detection time.

FIG. 17 is a configuration diagram showing a defect undetectable region of the laminated plywood.

FIG. 18 is a front view of a defect detection device used in a method for detecting a defect in a laminated plywood according to a fifth embodiment of the present invention.

FIG. 19 is a front view of a defect detection device used in the method for detecting a defect of a laminated plywood according to the embodiment.

FIG. 20 is a graph showing the relationship between the distance between the displacement sensor detected by the displacement sensor and the detection head and the detection time.

FIG. 21 is a front view of a defect detection device used in a method for detecting defects in laminated plywood according to a sixth embodiment of the present invention.

FIG. 22 is a front view of a defect detection device used in the method for detecting a defect of a laminated plywood according to the embodiment.

FIG. 23 is a front view of a defect detection device used in a method for detecting defects in laminated plywood according to a seventh embodiment of the present invention.

FIG. 24 is a configuration diagram of a defect detection device used in the defect detection method for laminated plywood according to the embodiment.

FIG. 25 is a configuration diagram of a defect detection device used in the defect detection method for a laminated plywood according to the embodiment.

FIG. 26 is a configuration diagram of a defect detection device used in the defect detection method for laminated plywood according to the embodiment.

FIG. 27 is a configuration diagram of a defect detection device used in the defect detection method for laminated plywood according to the embodiment.

FIG. 28 is a configuration diagram of a defect detection apparatus used in the method for detecting a defect of a laminated plywood according to the embodiment.

FIG. 29 is a configuration diagram of a defect detection apparatus used in the defect detection method for laminated plywood according to the embodiment.

FIG. 30 is a graph showing the relationship between the distance between the deflection sensor detected by the deflection sensor and the detection head and the detection time.

FIG. 31 is a front view of a defect detection device used in the method for detecting defects in laminated plywood according to the eighth embodiment of the present invention.

FIG. 32 is a configuration diagram of a defect detection device used in the defect detection method for a laminated plywood according to the embodiment.

FIG. 33 is a configuration diagram of a defect detection apparatus used in the defect detection method for a laminated plywood according to the embodiment.

FIG. 34 is a configuration diagram of a defect detection device used in the defect detection method for laminated plywood according to the embodiment.

FIG. 35 is a configuration diagram of a defect detection apparatus used in the defect detection method for a laminated plywood according to the embodiment.

FIG. 36 is a configuration diagram of a defect detection device used in the defect detection method for a laminated plywood according to the embodiment.

FIG. 37 is a configuration diagram of a defect detection device used in the laminated plywood defect detection method according to the embodiment.

FIG. 38 is a front view of a defect detection device used in the defect detection method for laminated plywood according to the ninth embodiment of the present invention.

FIG. 39 is a side view of a defect detection apparatus used in the method for detecting a defect of a laminated plywood according to the embodiment.

FIG. 40 is a graph showing the relationship between the displacement of the pressing roller and the detection time (when warpage is not corrected).

FIG. 41 is a graph showing the relationship between the displacement of the pressing roller and the detection time (when correcting warpage).

FIG. 42 is a waveform obtained by sampling the behavior of the pressing roller used in the defect detection method for laminated plywood according to the ninth embodiment of the present invention.

FIG. 43 is a graph showing a defect pattern.

FIG. 44 is a table (for evaluation evaluation index calculation).

FIG. 45 is a cross-sectional view of a pressing roller used in a method for detecting a defect in a laminated plywood according to an eleventh embodiment of the present invention.

FIG. 46 is a waveform sampled from the behavior of the pressing roller used in the method for detecting defects in laminated plywood according to the twelfth embodiment of the present invention.

FIG. 47 is a conceptual diagram of a defect detection method for laminated plywood according to a thirteenth embodiment of the present invention.

FIG. 48 is a sectional view of a laminated plywood defect detection apparatus according to a fourteenth embodiment of the present invention.

FIG. 49 is a cross-sectional view of a laminated plywood defect detection apparatus according to a fifteenth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminated plywood 1a Surface layer material 2 Pressing roller mounting base 3 Detection head mounting base 4 Pressing roller 5 Detection head 6 Deflection sensor 10 Conveyor 12 Painting roller 21 Defect 22 Pneumatic device 23 Magnetic force device 24 Floor plate 34 Warp correcting roller 35 Roller belt

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-135206 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B27D 1/00

Claims (22)

(57) [Claims] 1. The surface of the laminated plywood is pressed by a pressing roller,
By moving the laminated plywood and the pressing roller relatively,
A defect detection method for a laminated plywood, comprising detecting a behavior occurring in a pressing direction of the pressing roller and detecting a defect on a back surface of a surface material of the laminated plywood. 2. A method for detecting defects in a laminated plywood, comprising coating a surface of the laminated plywood containing no defective portion with a coating roller, wherein the roller diameter of the pressing roller is the same as the roller diameter of the coating roller. 2. The method according to claim 1, wherein the pressing force of the pressing roller is equal to the pressing force of the coating roller. 3. The method according to claim 2, wherein the diameter of the pressing roller is smaller than the diameter of the coating roller. 4. The method for detecting defects in a laminated plywood according to claim 1, wherein the pressing roller is divided into a plurality in the width direction. 5. The same portion of the surface of the laminated plywood is pressed by two pressing rollers having different pressing forces, a behavior occurring in the pressing direction of the two pressing rollers is detected, and the behavior in the pressing direction between the two pressing rollers is detected. 3. The method for detecting defects in a laminated plywood according to claim 1, wherein a defect portion is detected based on a difference in generated behavior. 6. Detecting that the moving laminated plywood has been conveyed to a predetermined position, moving a pressing roller on the surface of the laminated plywood and bringing the same into contact therewith, the behavior occurring in the pressing direction of the pressing roller is determined. The method for detecting a defect in a laminated plywood according to claim 1, wherein the defect is detected to detect a defect on a back surface of a surface material of the laminated plywood. 7. The movement of the pressing roller to the surface of the laminated plywood,
Until the pressing roller contacts the laminated plywood, the pressing is performed at a slow speed, and a strong pressing force is generated at the moment of contact with the laminated plywood, so that the pressing roller and the laminated plywood are smoothly contacted. 7. The method for detecting defects in laminated plywood according to claim 6, wherein: 8. While pressing the surface of the laminated plywood with a pressing roller, and while relatively moving the laminated plywood and the pressing roller, a behavior occurring in a pressing direction of the pressing roller is sampled as a deviation, and the deviation is sampled. Performs differential processing per unit time , classifies the content of defects from the data,
In addition, the degree of the defect is quantified from the data ,
The method for detecting a defect in a laminated plywood according to claim 2 , wherein a defect on the back surface of the surface material of the laminated plywood is detected as an appropriate evaluation judgment index . 9. The defect on the back surface of the surface material of the laminated plywood is classified into three patterns, and from the deviation signal of the behavior occurring in the pressing direction of the pressing roller, it is determined which of the three patterns the waveform of the defect candidate belongs to. 9. The method for detecting a defect in a laminated plywood according to claim 8, wherein a defect on a back surface of a surface material of the laminated plywood is detected by the determination. 10. A plurality of pressing rollers are distributed in the width direction, and it is determined which of the three patterns the waveform of the defect candidate belongs to from a deviation signal of a behavior occurring in a pressing direction of each pressing roller, 10. The method for detecting defects in a laminated plywood according to claim 9, wherein the judgment results of each pressing roller are matched to make a comprehensive judgment. 11. Even when it is determined that the waveform of one defect candidate of a plurality of pressing rollers belongs to one of three patterns, the pressing roller detects abnormal fluctuation.
If not, the evaluation judgment index is set to zero and the evaluation
If the constant index zero continues for a predetermined time or more, it is diagnosed that a problem has occurred in the deviation sensor of the pressing roller,
11. The method for detecting a defect in a laminated plywood according to claim 10, wherein the subsequent determination excludes the determination result of the pressing roller and notifies the diagnosis content. 12. A behavior occurring in the pressing direction of the pressing roller at the start and end of contact between the pressing roller and the laminated plywood in the relative movement direction of the laminated plywood and the pressing roller, and matching with a normal state is performed. 9. The method according to claim 8, wherein it is determined whether or not the pressing force of the pressing roller is normal. 13. is a plurality distributed the pressing roller in the width direction, the contact start and contact end of the push and each of the pressing roller and laminated plywood relative movement direction of the laminated plywood and the pressure roller
The method according to claim 1, further comprising: observing a behavior occurring in a pressing direction of the pressure roller, matching a behavior occurring in the pressing direction with respect to each of the pressing rollers, and determining whether the pressing force of the pressing roller is normal. 13. The method for detecting defects in laminated plywood according to 12. 14. A conveying means for conveying the laminated plywood at a constant speed, a pressing roller for pressing the laminated plywood on the conveying means with a constant pressing force, and detecting a behavior occurring in a pressing direction of the pressing roller. Detecting means, a detecting device for detecting a defect on the back surface of the surface material of the laminated plywood from the behavior in the pressing direction of the pressing roller obtained by the detecting means, and a non-defective product having no defect in the laminated plywood from the detection result of the detecting device. And a control device for selecting a defective material and transporting it to the next process. 15. A detecting head mounting base, wherein the detecting means includes a detecting head, a detecting head mounting base, a pressing roller mounting base, a pressing roller, and a displacement sensor, and one end of the pressing roller mounting base is provided in the pressing direction. A detection head is formed at the other end, and a pressing roller is rotatably installed in the lower middle part of the detection head, and the deviation of the detection head is detected by the deviation sensor.
The defect detecting device for a laminated plywood according to claim 14, wherein a behavior occurring in a pressing direction of the pressing roller is detected by the detection. 16. The laminated plywood surface is pressed by a pressing roller,
By moving the laminated plywood and the pressing roller relatively,
Detecting the behavior of the pressing roller that occurs in the pressing direction, in the detection of the defect of the laminated plywood to detect the defect of the surface layer back surface of the laminated plywood, performing the generation of the pressing force using a pneumatic device, conveyed In synchronization with the coming laminated plywood, the pressing of the pressing roller against the laminated plywood, freely perform isolation,
15. The defect detecting device for laminated plywood according to claim 14, wherein a region where a defect cannot be detected due to vibration of the pressing roller generated at the time of contact between the pressing roller and the laminated plywood is minimized. 17. The laminated plywood surface is pressed by a pressing roller,
By moving the laminated plywood and the pressing roller relatively,
In the detection of the defect of the laminated plywood, which detects the behavior of the pressing roller generated in the pressing direction and detects the defect of the back surface material of the laminated plywood, the generation of the pressing force is performed using a magnetic force device, and the conveyed paper is conveyed. Synchronously with the laminated plywood, the pressing of the pressing roller against the laminated plywood, freely performed,
15. The defect detecting device for laminated plywood according to claim 14, wherein a region where a defect cannot be detected due to vibration of the pressing roller generated at the time of contact between the pressing roller and the laminated plywood is minimized. 18. Pressing the surface of the laminated plywood with a pressing roller,
By moving the laminated plywood and the pressing roller relatively,
Detecting the behavior of the pressing roller which occurs in the pressing direction, in the defect detection of laminated plywood that detects the surface layer material the back surface of the defect of the laminated plywood, the conveyance of the laminated plywood, floor plate top surface
Transfer the pressing roller smoothly from the top of the laminated plywood
And a vertically movable sliding plate for smooth contact between the pressing roller and the laminated plywood, and a defect caused by vibration of the pressing roller generated at the time of contact between the pressing roller and the laminated plywood. The defect detection device for laminated plywood according to claim 14, wherein the occurrence of an undetectable region is prevented. 19. A region in which the conveyance of the laminated plywood is performed with reference to the upper surface, and a defect detection area due to the vibration of the pressing roller generated at the time of contact between the pressing roller and the laminated plywood without being affected by the thickness of the laminated plywood. 19. The defect detecting device for laminated plywood according to claim 18, wherein occurrence of cracks is prevented. 20. A pressure roller , comprising : a pair of rollers arranged in parallel in a width direction of a pressing roller to correct a warp in a width direction of the laminated plywood;
The defect detecting device for laminated plywood according to claim 14, wherein a behavior occurring in a pressing direction of the laminated plywood is detected. 21. A warp correcting roller for pressing a laminated plywood is provided separately from a pressing roller , a warp in the longitudinal direction of the laminated plywood is corrected, and a behavior occurring in a pressing direction of the pressing roller is detected. The apparatus for detecting defects in laminated plywood according to claim 14. 22. The laminated plywood according to claim 21, wherein a roller belt is attached to a warp correcting roller for pressing the laminated plywood and a pressing roller to form a transport belt, and defects in the laminated plywood are stably detected. Defect detection equipment.