JP2003035702A - Inspection apparatus for metallic foreign material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspection apparatus which can precisely detect a metallic foreign material mixed with a substance having a lens effect such as a glass fiber or with even an opaque substance. SOLUTION: In the inspection apparatus 10 which detects the metallic foreign material stuck to a specimen or mixed in its inside, a group of magnetic sensors 12 which are arranged so as to face the specimen and which output prescribed detection signals, a holding means which holds the respective magnetic sensors 12, and decision means 16, 17, 18 by which the existence of metallic foreign material are determined by comparing the detection signals to be output from the respective magnetic sensors 12 with a predetermined reference value, are installed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
Alternatively, the present invention relates to an inspection device for detecting metallic foreign substances mixed therein.

[0002]

2. Description of the Related Art Generally, as insulating materials for electric parts, there are inorganic fibers (such as glass fibers), synthetic resins, woven fabrics made of synthetic fibers and natural fibers, nonwoven fabrics and films.
For example, in the case of a glass cloth used as a base material for a printed wiring board, if metallic foreign matter adheres or is mixed in the glass cloth, the insulation of the manufactured printed wiring board is impaired, The circuit formed on the printed wiring board may be short-circuited.

Therefore, conventionally, after weaving a glass cloth and before putting it in the manufacturing process of the printed wiring board, the glass cloth is inspected to confirm the presence of the metallic foreign matter, and the presence of the metallic foreign matter is confirmed. Is being removed.

Conventionally, the glass cloth is inspected by irradiating the glass cloth with inspection light, capturing an image of the transmitted light with a CCD camera, and performing a binarization process on the obtained grayscale image. An optical inspection method such as detecting a metallic foreign matter is adopted. That is, since the glass fibers constituting the glass cloth are transparent, while the metallic foreign matter is opaque, by imaging the transmitted light with a CCD camera or the like, the density corresponding to the metallic foreign matter becomes a high density. The image can be obtained.

[0005]

However, the above-described conventional optical inspection method has the following problems. That is, the cross section of the glass fiber has a circular or elliptical shape, and the transmitted light is refracted or diffracted due to the lens effect caused by this cross section, and the synergistic effect with the texture of the glass cloth causes a captured image to appear. In addition to the metallic foreign matter, moire fringes and shading due to the diffraction grating effect are generated. Therefore, the high-density image generated by the moire fringes and the diffraction grating effect cannot be distinguished from the high-density image corresponding to the metal foreign matter, and as a result, the metal foreign matter cannot be accurately detected.

In addition to this, a search coil type metal detection device and X
Although there is a radiographic metal detection device, a search coil type metal detection device has a drawback that it is difficult to detect a metallic foreign matter of about 1 mm or less, and an X-ray transmissive metal detection device has a drawback. However, there are drawbacks such as safety problems and complicated and expensive equipment.

[0007] Usually, when a metallic foreign substance is detected by the optical inspection, a detailed visual inspection is performed based on the detection result to remove the metallic foreign substance.
Since this visual inspection and removal processing are extremely complicated and time-consuming operations, if the primary inspection by optical inspection is not performed accurately, the subsequent secondary inspection (visual inspection) work is wasted. Therefore, a loss will occur in the entire inspection work.

In addition to the above-mentioned glass cloth, with regard to sewn clothes and the like, there is a possibility that the tips of the sewing needles that are broken during sewing may be mixed in the products. A test method that can be accurately detected is desired. However, the above-mentioned optical inspection method cannot detect the metallic foreign matter mixed in the opaque clothing.

The present invention has been made in view of the above circumstances, and even if the object to be inspected has a lens effect such as glass fiber or is opaque, metallic foreign matter mixed in it is included. An object of the present invention is to provide an inspection device that can be accurately detected.

[0010]

The invention described in claim 1 of the present invention for solving the above-mentioned problems is an inspection apparatus for detecting a metallic foreign substance adhering to an inspection object or mixed therein. That is, the magnetic sensor group that is arranged to face the object to be inspected and outputs a predetermined detection signal, a holding unit that holds each magnetic sensor, and the detection signal output from each magnetic sensor are predetermined. The present invention relates to an apparatus for inspecting metal foreign matter, characterized in that it is provided with a determination means for determining the presence or absence of the metal foreign matter by comparing the determined reference value.

The magnetic sensor has two magnetoresistive elements arranged in parallel, and is arranged to face the magnetoresistive elements.
A permanent magnet that applies a bias magnetic field to the magnetoresistive element, the magnetic field changes when the metal body passes through the magnetic field applied to the magnetoresistive element, and the magnetic field changes according to the change in the magnetic field. The voltage signal (detection signal) output from the resistance element changes. Therefore, when the metallic foreign matter adheres to the inspection object or is mixed therein, the presence of the metallic foreign matter can be grasped as a change in the voltage signal output from the magnetoresistive element.

In the metallic foreign matter inspection apparatus according to the present invention, the magnetic sensor group is made to face the object to be inspected, these are made to scan along the object to be inspected, and the detection signal outputted from each magnetic sensor is judged by the judging means. And when it exceeds a predetermined reference value, it is determined that the foreign matter is mixed in the inspection object. The reference value is determined according to the size and material of the metallic foreign matter that is the detection target.

Thus, according to this metal foreign matter inspection apparatus, even if the inspection object has a lens effect such as glass fiber or is opaque as compared with the above-mentioned optical inspection method, It is possible to accurately detect mixed metallic foreign matter. Moreover, since the predetermined area is inspected by using a plurality of magnetic sensors, the inspection can be efficiently performed.

When the object to be inspected is a long web such as a glass cloth, a conveying means for conveying the long web to be inspected through a predetermined route as in the invention described in claim 2. And a control means for controlling the operation of the conveying means, the magnetic sensor group is arranged such that its detection surface faces the conveyance path of the web and faces the web, and the detection is performed. It is preferable that the region is arranged so as to extend over the entire width direction of the web. According to such a metal foreign matter inspection apparatus, since the long web conveyed by the conveying means can be sequentially inspected by the magnetic sensor, more efficient inspection can be performed.

As a mode of arranging the magnetic sensor group so that the detection region extends over the entire width direction of the web, the magnetic sensors are arranged in a line in the width direction of the web, and further, the web is conveyed. It is arranged in multiple rows in the direction, and the detection areas of the magnetic sensors in each row are arranged such that they are sequentially overlapped between the rows and are displaced at a predetermined pitch in the width direction of the web. An arrangement mode can be mentioned in which the entire width is covered without gaps.

According to a third aspect of the present invention, the determination means in the metal foreign matter inspection apparatus according to the second aspect determines the detection signal width output from each of the magnetic sensors as a predetermined reference. The present invention relates to an apparatus for inspecting metal foreign matter, which is configured to discriminate between a signal for detecting the metal foreign matter and noise as compared with time. According to this metal foreign matter inspection device, noise can be effectively removed from the detection signals output from each magnetic sensor, and the detection accuracy of metal foreign matter can be improved. The reference time is determined according to the size of the metallic foreign matter as the detection target and the web transport speed.

According to a fourth aspect of the present invention, in the metal foreign matter inspection apparatus according to the second or third aspect, the holding means has a position where each of the magnetic sensors faces the web transfer path. The present invention relates to an apparatus for inspecting foreign metal, which is provided with a moving mechanism for moving it to a position away from it. According to this device, by operating the moving mechanism, each magnetic sensor can be moved from a position facing the web transfer path to a position distant therefrom, which facilitates maintenance work such as magnetic sensor replacement work. It becomes possible to do.

According to a fifth aspect of the present invention, in the metal foreign matter inspection device according to any one of the first to fourth aspects, the determination result data by the determination means and the length measurement means are calculated. Map generation means for generating two-dimensional map data relating to the presence or absence of metallic foreign matter on the inspection object based on the transport distance data, and output means for outputting the two-dimensional map data generated by the map generation means are further provided. Related to a metal foreign matter inspection device. According to this device, the visual inspector can immediately recognize the position where the metallic foreign matter exists by checking the two-dimensional map data regarding the presence or absence of the metallic foreign matter on the inspected object, which is more efficient. Inspection and removal work can be performed.

According to a sixth aspect of the present invention, in the metal foreign matter inspection apparatus according to any of the first to fifth aspects, each detection surface of the magnetic sensor group is covered with a non-magnetic film. The present invention relates to a metal foreign matter inspection device. The magnetic sensor has a higher detection ability as it approaches a metal body. Therefore, in order to detect metal foreign matters with high accuracy, it is necessary to bring the magnetic sensor as close as possible to the object to be inspected. On the other hand, if the magnetic sensor is brought into direct contact with the object to be inspected, the magnetic sensor may be damaged by friction with the object to be inspected. According to this metal foreign matter inspection device, since the detection surface of the magnetic sensor is covered with the non-magnetic film, even if the sensor detection surface is brought into contact with the object to be inspected, the detection surface is protected by the film, While preventing damage to the sensor, the distance (gap) between the magnetic sensor and the object to be inspected can be kept constant, and highly accurate detection of metallic foreign matter becomes possible.

The invention according to claim 7 of the present invention relates to the metal foreign matter inspection device according to the sixth aspect, wherein the film is mixed with an antistatic agent. For example, when the object to be inspected is a glass cloth made of glass fiber, static electricity is easily charged by friction with the film. If the glass cloth is charged, it may adsorb dust in the atmosphere and cause a problem in the subsequent manufacturing process. According to this metal foreign matter inspection apparatus, since the film contains the antistatic agent, the antistatic effect is exhibited, and the object to be inspected can be prevented from being charged due to friction with the film.

According to an eighth aspect of the present invention, the holding means in the metallic foreign matter inspection apparatus according to the sixth or seventh aspect comprises a tension adjusting mechanism for adjusting the tension of the film. Related to inspection equipment.
According to this inspection device, by adjusting the tension applied to the film, the film can be in a state without slack. Then, the object to be inspected is conveyed while being in sliding contact with the film, so that the distance between the detection surface of the magnetic sensor and the object to be inspected can be always kept constant. Thus, according to this inspection device, inspection with stable detection accuracy can be performed.

As the inspection object in the present invention, a representative example is a cloth made of glass cloth, natural fiber or synthetic fiber, but it is clearly identified as metal from the signal output from the magnetic sensor. Any material may be used as long as it can be discriminated.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the accompanying drawings. In the inspection apparatus of this example, a glass cloth is an inspection target as an example of the inspection object.

As shown in FIGS. 1 and 5, a metallic foreign matter inspection apparatus (hereinafter, simply referred to as an inspection apparatus) 1 of the present embodiment has a feeding device 2 for feeding a glass cloth W from a glass cloth roll 4 and a fed glass. A guide roller 9 that guides the cloth W along a predetermined path, a winding device 5 that winds the glass cloth W into a roll shape, a frame 8 that rotatably supports the guide roller 9, and a winding device. The control device 23 for controlling the operation of No. 5 and the fixed detection device 10 and the portable detection device 50 for detecting the metallic foreign matter adhering to the conveyed glass cloth W or mixed therein.

The winding device 5 is configured to support the roll 6 and to transmit rotational power to the roll 6 by an electric motor or the like, and the glass cloth W is driven by the power applied to the roll 6. After being fed out (pulled out) from the glass cloth roll 4, guided by each guide roller 9 and conveyed along a predetermined path, the roll 6
It is wound up into a glass cloth roll 7 and formed. on the other hand,
The feeding device 2 is configured to rotatably support the roller 3 of the glass cloth roll 4 and to apply a braking force to the rotation of the roller 3 in the feeding direction. A predetermined tension is applied to the glass cloth W that is fed and conveyed by power.

As shown in FIG. 5, the fixed detecting device 10 includes a sensor unit 11 having a plurality of magnetic sensors 12.
And a processing device 15 for processing the detection signal output from each magnetic sensor 12.

As shown in FIGS. 3 and 4, the sensor unit 11 is provided with a plurality of magnetic sensors 12 held in the container 13 in a state where the detecting portions 12a are exposed to the outside and aligned in a line. , A plurality of the sensor units 11 are arranged in a line in a direction (width direction of the glass cloth W) orthogonal to the conveying direction of the glass cloth W, and further, the sensor unit 11 rows are arranged along the conveying direction of the glass cloth W. Double row (11a,
11b, 11c, 11d, 11e, 11f), and a group of sensor units 11 arranged in multiple rows in this way is fixedly mounted on the base 31.

Although not particularly shown in the structure, the magnetic sensor 12 is provided with two magnetoresistive elements arranged in parallel with each other, and is disposed so as to face the magnetoresistive elements, and a permanent magnetic field is applied to the magnetoresistive elements. Equipped with a magnet,
When the metal body passes through the magnetic field applied to the magnetoresistive element, the magnetic field changes, and the voltage signal (detection signal) output from the magnetoresistive element changes according to the change in the magnetic field. There is.

Further, as shown in FIG. 4, the detection area of the single magnetic sensor 12 has a width of d in the width direction of the glass cloth W, and each row (11a, 11b, 11c, 11d, 1
1e, 11f), the detection width area d of the magnetic sensor 12 is shifted at a predetermined pitch in the width direction of the glass cloth W while the rows are sequentially overlapped between the rows as shown in the figure. A detection region having a width D is formed without a gap in the width direction. Then, the glass cloth W is conveyed so as to pass through the detection area width D.

As shown in FIG. 3, the base 31 is fixed to a support frame 32. In addition, the support frame 32 has a pair of opposed plates 37 and 40 arranged at predetermined intervals.
Is erected, and the base 31 is the facing plate 3
It is arranged between 7 and 40.

A fixing metal fitting 39 is fixedly provided on one of the facing plates 37, and the fixing metal fitting 3 is further fixed to the fixing metal fitting 39.
8 is fixed. In addition, the opposite plate 4 on the other side
Similarly, a fixing metal fitting 42 is fixedly mounted on 0, and a fixing metal fitting 41 is provided so as to face the fixing metal fitting 42. Fixing bracket 42,
41 is provided with an adjusting bolt 43 penetrating them, a nut 44 screwed into the adjusting bolt 43, and a compression coil spring 45 arranged between the fixing fittings 42 and 41 while being inserted by the adjusting bolt 43. The fittings 41 are engaged with each other, and the fastening fittings 41 approach the fastening fittings 42 by tightening the nuts 44, and the fastening fittings 41 separate from the fastening fittings 42 by loosening the nuts 44.

Further, one end of the non-magnetic resin film 46 is adhered to the fixing metal fitting 38 with an adhesive tape or the like, while the other end of the resin film 46 is similarly adhered to the fixing metal fitting 41. Thus, the resin film 46 is in a state of being bridged between the pair of opposed plates 37 and 40. Then, by appropriately tightening the nut 44, tension is applied to the resin film 46, and the detection surface of each magnetic sensor 12 is made into the resin film 46.
It is in the state of being covered by this.

As shown in FIG. 2, the support frame 32 is
Is swingably attached via a hinge 33 to a horizontal frame 35 that is horizontally spanned between the vertical frames 8a and 8a that form the gantry 8. In the standing state shown by the solid line in FIG. Is fixed to the fixing plate 34 so that the detection surface of the magnetic sensor 12 faces the conveyance path of the glass cloth W, that is, the resin film 46 covering the detection surface of the magnetic sensor 12 is the glass cloth. In a state of sliding contact with W, on the other hand, as shown by the chain double-dashed line, when it is released from the fixing plate 34 and is laid down sideways, it is supported by the column 36 standing on the pedestal 8. Has become.

As can be easily understood from the above description,
The resin film 46 is provided on the detection surface of the magnetic sensor 12,
Although it plays a role of protecting the glass cloth W from abrasion and damage due to sliding contact with the glass cloth W, it is preferable that its material does not interfere with the detection of the metal body of the magnetic sensor 12, and its thickness is 0. It is preferably in the range of 05 mm to 0.15 mm. If the thickness is less than 0.05 mm, the wear durability is extremely poor. On the contrary, if the thickness is more than 0.15 mm, the distance between the detection surface of the magnetic sensor 12 and the glass cloth W is too large, and the magnetic sensor 12 is too large. This is because the detection sensitivity of is reduced. Further, the glass cloth W is easily charged by friction with other objects. Therefore, the resin film 46
Preferably has an antistatic effect in which an antistatic agent (for example, a surfactant) is kneaded.

As shown in FIG. 5, the processing device 15 has
It comprises an amplifier 16, a comparator 17, a defect detection unit 18, an inspection control unit 19, a map generation unit 20 and a length measurement unit 21. The amplifier 16 and the comparator 17 are the base 3
1 is stored in the defect detection unit 18 and the inspection control unit 1
9. The map generation unit 20 and the length measurement unit 21 are appropriately installed separately from them.

The amplifier 16 includes the magnetic sensors 12
It is a processor that amplifies and outputs a detection signal output from. The comparator 17 is a comparator, and compares a preset reference value with each detection signal output from the amplifier 16, and when the detection signal exceeds the reference value,
A rectangular wave (pulse signal) is generated only for that time and transmitted to the defect detection unit 18. The reference value is a threshold value for detecting a metallic foreign substance, and when the magnetic sensor 12 detects a metallic foreign substance, the magnetic sensor 12 outputs a detection signal having a value larger than the reference value.

The defect detecting unit 18 receives each signal transmitted from the comparator 17, and when the pulse width included in these signals exceeds a preset reference time, determines that there is a metallic foreign matter, The presence information (address information) of the magnetic sensor 12 corresponding to the detection signal is transmitted to the detection control unit 19 and the map generation unit 20 along with a signal to confirm the presence of the foreign metal. The detection signal output from the magnetic sensor 12 also includes noise, and the comparator 17
Although the rectangular wave generated by will also contain a noise component, this noise component is removed by the processing of the defect detection unit 18. That is, since the rectangular wave of the noise component has a short pulse width, the pulse width of the rectangular wave can be compared with the reference time, and a rectangular wave having a pulse width shorter than the reference time can be regarded as noise. The noise is removed by the above processing. The reference time is determined according to the size of the metallic foreign matter to be detected and the speed of conveyance of the glass cloth.

The length measuring unit 21 is a processing unit for calculating the transport distance of the glass cloth W. As shown in FIG. 2, the length measuring unit 21 receives a rotational position signal from a rotary encoder 47 attached to the guide roller 9 and receives it. The transport distance of the glass cloth W is calculated based on the rotation position signal. The guide roller 9 is in contact with the glass cloth W conveyed in the direction of the arrow, and rotates with the movement of the glass cloth W. Therefore, the conveyance distance of the glass cloth W can be calculated by multiplying the circumference of the guide roller 9 by the number of rotations detected by the rotary encoder 47. Then, the length measurement unit 21 sequentially transmits the transport distance of the glass cloth W calculated in this way to the inspection control unit 19 and the map generation unit 20.

The inspection control section 19 is provided with the defect detection section 1
When the signal is received from the signal No. 8, and this signal is a signal recognizing the presence of the metallic foreign matter, the deceleration signal is immediately transmitted to the control device 23 and the glass cloth W is conveyed from the length measuring unit 21. Based on the distance data, the magnetic sensor 12
The transport distance of the glass cloth W from the time when the metallic foreign matter is detected is calculated, and based on this, the portion of the glass cloth W having the metallic foreign matter reaches a predetermined visual inspection position (position M in FIG. 1). It is checked whether or not it has reached the visual inspection position, and a stop signal is transmitted to the control device 23. The detection control unit 19 receives the address information of the magnetic sensor 12 that has detected the metallic foreign matter from the defect detection unit 18, and determines which magnetic sensor 1
2 recognizes whether or not a metal foreign object is detected, and the distance from each magnetic sensor 12 to the visual inspection position can be calculated in advance. Therefore, as described above, the length measuring unit 2
Based on the transport distance data of the glass cloth W transmitted from 1,
It is possible to confirm whether or not the portion of the glass cloth W having the foreign metal has reached a predetermined visual inspection position.

The control device 23 receives the deceleration signal from the inspection control unit 19 to reduce the winding speed of the winding device 5, and at the same time, sends a signal to the alarm means 24 to sound an alarm buzzer or An appropriate alarm provided in the alarm means 24 such as turning on an alarm lamp is activated. Also, the stop signal is received from the inspection control unit 19 to stop the drive of the winding device 5.

The map generation section 20 receives the address information of the magnetic sensor 12 which has detected the metallic foreign matter and the presence confirmation signal of the metallic foreign matter from the defect detection section 18, and also the length measuring section 2
Data regarding the transport distance of the glass cloth W is received from 1 and two-dimensional map data having the width direction and the longitudinal direction (transport direction) of the glass cloth W as coordinate axes are generated based on these data. That is, the position information of the metallic foreign matter in the width direction of the glass cloth W is specified from the arrangement information of the magnetic sensor 12 group and the address information of the detected magnetic sensor 12 shown in FIG. 4, and similarly, the arrangement information of the magnetic sensor 12 group. The position information of the metallic foreign matter in the conveyance direction of the glass cloth W is specified from the address information of the detection magnetic sensor 12 and the conveying distance data of the glass cloth W, and the position of the metallic foreign matter in the glass cloth W is indicated from these positional information. Two-dimensional map data is generated. A display 22 is connected to the processing device 15, and the two-dimensional map data generated by the map generation unit 20 is displayed on the display 22. In addition to this, the two-dimensional map data may be printed by a printer as appropriate, or may be saved in a recording medium as appropriate.

As shown in FIGS. 6 to 8, the portable detection device 50 includes a sensor unit 51 having a plurality of magnetic sensors 52, and a processing device 56 for processing detection signals output from the magnetic sensors 52. And these sensor units 51
And a container 54 for holding the processing device 56.

As shown in FIGS. 6 and 7, the sensor unit 51 has a structure similar to that of the sensor unit 11, and the detection unit 52a is exposed to the outside and arranged in a line in a container. It comprises a plurality of magnetic sensors 52 held by 53. Further, as shown in FIG. 7, the container 54 has a handle 55, which holds the sensor unit 51 and houses the processing device 56 therein, as described above.

The processing unit 56, as shown in FIG.
It comprises an amplifier 57, a comparator 58, a defect detection section 59 and an alarm means 60. Like the amplifier 16, the amplifier 57 is a processor that amplifies and outputs a detection signal output from each magnetic sensor 52, and the comparator 58, like the comparator 17, also has a preset reference value. It is a comparator that compares each detection signal output from the amplifier 57, and when the detection signal exceeds a reference value, generates a rectangular wave (pulse signal) for that time and transmits it to the defect detection unit 59. .

The defect detecting section 59 is a processing section which performs substantially the same processing as that of the defect detecting section 19, receives each signal transmitted from the comparator 58, and determines the pulse width included in these signals in advance. When the set reference time is exceeded, it is determined that there is a metallic foreign substance, and a process of transmitting a metal foreign substance presence confirmation signal to the alarm means 60 is performed. Then, the alarm means 60 receives the signal from the defect detecting section 59 and activates an appropriate alarm provided in the alarm means 60, such as sounding an alarm buzzer or lighting an alarm lamp.

It should be noted that the comparator 17 and the defect detection unit 18 which form the fixed detection device 10, and the comparator 58 and the defect detection unit 5 which form the portable detection device 50.
9 corresponds to the determination means in the present invention (claims 1, 3 and 5).

According to the inspection apparatus 1 of the present example having the above configuration, the inspection of the glass cloth W as the inspection object is performed as follows. It is assumed that the front end of the glass cloth W is pulled out from the glass cloth roll 4 and is wound around the roll 6 via the guide rollers 9 in sequence.

First, the winding device 5 is driven and controlled by the control device 23, whereby the glass cloth W is sequentially pulled out from the glass cloth roll 4 and guided by the respective guide rollers 9 along a predetermined path. After traveling, it is wound up by a roll 6 and formed into a glass cloth roll 7. Then, while traveling, the glass cloth W is inspected by the fixation detection device 10 for the presence of metallic foreign matter.

That is, in the fixed inspection device 10, the magnetic sensor 1 which is in sliding contact with the running glass cloth W through the resin film.
2 outputs a detection signal, which is amplified by an amplifier 16 and then compared by a comparator 17 with a predetermined reference value. When the detection signal exceeds the reference value, a rectangular wave is generated for that time, which is a drawback. It is transmitted to the detection unit 18. Then, the defect detection unit 18 uses the comparator 17
When the pulse width included in the signal transmitted from the signal exceeds a preset reference time, it is determined that a metal foreign object exists, and the presence information of the metal foreign object is confirmed together with the address information of the magnetic sensor 12 corresponding to the detection signal. Is transmitted to the inspection control unit 19 and the map generation unit 20.

When the signal received from the defect detection unit 18 is a signal that recognizes the presence of a metallic foreign matter, the inspection control unit 19 immediately transmits a deceleration signal to the control device 23,
Then, based on the transport distance data of the glass cloth W transmitted from the length measuring unit 21, it is confirmed whether or not the portion of the glass cloth W having the foreign metal has reached the visual inspection position, which reaches the visual inspection position. At that time, a stop signal is transmitted to the control device 23. Further, the map generation unit 20 receives the address information of the magnetic sensor 12 that has detected the metallic foreign matter and the presence confirmation signal of the metallic foreign matter from the defect detection unit 18, and the data regarding the transport distance of the glass cloth W from the length measurement unit 21. Then, based on these data, the two-dimensional map data showing the existing position of the metallic foreign matter on the glass cloth W is generated and displayed on the display 22.

On the other hand, the control device 23 receives the deceleration signal from the detection detection control section 19 to reduce the winding speed of the winding device 5, and at the same time, sends a signal to the alarm means 24 to sound an alarm. Upon receiving a stop signal from the inspection control unit 19, the drive of the winding device 5 is stopped.

When an alarm sound is emitted from the alarm means 24, the inspector confirms the position where the metallic foreign matter exists from the map information displayed on the display 22, and then the portable detecting device 50 as shown in FIG. And moves to the visual inspection position, and the vicinity of the position of the metallic foreign matter specified by the map information is precisely inspected using the portable detection device 50. That is, the inspector uses the magnetic sensor detection unit 5 of the portable detection device 50.
While the 2a is in contact with the glass cloth W, the glass cloth W is scanned along the glass cloth W to detect the metallic foreign matter, and when an alarm sound is emitted from the alarm means 60, the inspection unit is further precisely viewed to detect the metallic foreign matter, Get rid of this.

Then, after the removal of the metallic foreign matter is completed in this way, the winding device 5 is again controlled by the control device 23.
Is driven, and thereafter the entire glass cloth W is inspected in the same manner.

As described in detail above, according to the inspection apparatus 1 of the present example, the magnetic sensors 12 and 52 are used to detect the metallic foreign matter, so that compared with the conventional optical inspection method,
Even if the object to be inspected has a lens effect such as glass fiber or is opaque, it is possible to accurately detect metallic foreign matter mixed in the object, and use a plurality of magnetic sensors 12 and 52. Since the predetermined region is inspected, the inspection can be performed efficiently. Also,
Since the long glass cloth W is inspected while traveling along the predetermined route, the long inspection object can be efficiently inspected.

When it is determined that the metallic foreign matter is present, the portion where the metallic foreign matter is present is automatically conveyed to the visual inspection position, and the two-dimensional map information indicating the position of the metallic foreign matter on the glass cloth W is displayed. Since the information is displayed on the display 22, it is possible to efficiently perform the visual inspection after the primary inspection by the fixing detection device 10 and the removal work of the metallic foreign matter.

In order to detect metallic foreign matters with high accuracy, it is necessary to bring the magnetic sensor 12 as close as possible to the glass cloth W. On the other hand, when the magnetic sensor 12 is brought into direct contact with the glass cloth W, the magnetic sensor 12 is rubbed by the friction with the glass cloth W.
May be damaged. According to the inspection apparatus 1 of the present example, the detection surface of the magnetic sensor 12 is covered with the non-magnetic resin film 46, so the detection surface of the magnetic sensor 12 is protected by this resin film 46. This makes it possible to detect the metallic foreign matter with high accuracy while preventing damage to the magnetic sensor 12.

When the glass cloth W is charged, dust in the atmosphere may be adsorbed, which may cause a problem in the subsequent manufacturing process. However, since a surfactant is mixed in the resin film 46, this interface The activator exerts an antistatic effect and prevents the glass cloth W from being charged due to friction with the resin film 46. In addition, the inspection device 1 of this example
Since the tension applied to the resin film 46 can be adjusted and the resin film 46 can be kept in a slack state, the distance between the detection surface of the magnetic sensor 12 and the glass cloth W can always be kept constant. Yes, this allows
It is possible to maintain stable detection accuracy.

Further, the fixed detecting device 10 can be swung between the position where each magnetic sensor 12 thereof faces the transfer path of the glass cloth W and the position (retracted position) apart from this position. Therefore, by swinging the fixed detection device 10 to the retracted position, it is possible to easily perform the replacement work of the resin film 46 and the magnetic sensor 12.

Although one embodiment of the present invention has been described above, the specific mode of the present invention is not limited to this. In particular, the object to be inspected is not limited to the glass cloth W described above, and the object to be inspected may be of a short length. When the inspection object is short, it is convenient and efficient to inspect using the portable detection device 50.

[Brief description of drawings]

FIG. 1 is a front view showing a schematic configuration of a metal foreign matter inspection apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged view showing a portion where a fixation detecting device according to the present embodiment is disposed in an enlarged manner.

FIG. 3 is an enlarged view showing a portion A in FIG. 2 in an enlarged manner.

FIG. 4 is a view showing an arrangement state of magnetic sensors according to the present embodiment, and is a side view in the direction of arrow B in FIG.

FIG. 5 is a block diagram showing a schematic configuration of a fixed inspection device according to the present embodiment.

FIG. 6 is a front view showing a portable detection device according to the present embodiment.

FIG. 7 is a bottom view of FIG.

FIG. 8 is a block diagram showing a schematic configuration of a portable inspection device according to the present embodiment.

[Explanation of symbols]

1 (Metallic foreign substance) inspection device 2 Feeding device 4 glass cloth roll 5 Winding device 7 glass cloth roll 10 Fixed detection device 11 Sensor unit 12 Magnetic sensor 15 Processor 16 amplifier 17 Comparator 18 Defect detection section 19 Inspection control section 20 Map generator 21 Measuring unit 23 Control device 24 Warning means 46 Resin film 50 Portable detection device 51 sensor unit 56 processor 57 Amplifier 58 Comparator 59 Defect detection unit 60 Alarm means

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shinichi Inaba             1204 Yoshida, Oita, Oizumi-cho, Gunma Prefecture             Within Nebo Corporation (72) Inventor Hiroyuki Uosumi             2-4-12 Nakazaki-nishi, Kita-ku, Osaka-shi, Osaka Prefecture             Kanebo Corporation (72) Inventor Kouji Ueda             Osaka Prefecture Osaka City Kita-ku Minamimorimachi 1-4-19             Kanebo Engineering Co., Ltd. F term (reference) 2G053 AA13 AB19 BB03 BB11 BC20                       CB20 CB24 DB03 DB06 DB09

Claims (8)

[Claims] 1. An inspection apparatus for detecting metallic foreign matter adhering to or mixed with an object to be inspected, comprising: a magnetic sensor group arranged to face the object to be inspected and outputting a predetermined detection signal; Holding means for holding each magnetic sensor, the detection signal output from each of the magnetic sensor, a determination means for comparing the detection signal output from each magnetic sensor with a predetermined reference value to determine the presence or absence of the metallic foreign matter is configured. Characteristic foreign metal inspection device. 2. The magnetic sensor group further comprises: a transport means for transporting a long web as an inspection object along a predetermined path; and a control means for controlling the operation of the transport means. 2. The apparatus for inspecting metallic foreign matter according to claim 1, wherein is arranged so as to face a conveyance path of the web and to be opposed to the web, and the detection area thereof is arranged so as to extend over the entire width direction of the web. . 3. The determination means is configured to compare the detection signal width output from each of the magnetic sensors with a predetermined reference time to determine a signal detecting the metallic foreign matter and noise. The inspection device for metallic foreign matter according to claim 2, wherein 4. The holding means holds the magnetic sensors,
4. The metal foreign matter inspection device according to claim 2, further comprising a moving mechanism that moves the web between a position facing the web transfer path and a position away from the web transfer path. 5. Map generating means for generating two-dimensional map data regarding presence / absence of metallic foreign matter on the object to be inspected, based on the determination result data by the determining means and the transport distance data calculated by the length measuring means. 5. The apparatus for inspecting metallic foreign matter according to claim 1, further comprising: an output unit that outputs the two-dimensional map data generated by the map generating unit. 6. The detection surface of each of the magnetic sensor groups is covered with a non-magnetic film.
Inspection device for any of the metal foreign matters described. 7. The apparatus for inspecting metallic foreign matters according to claim 6, wherein the film contains an antistatic agent. 8. The apparatus for inspecting metallic foreign matters according to claim 6, wherein the holding means includes a tension adjusting mechanism for adjusting the tension of the film.