JP2001055665A - Finish-turn inspection tool for circular knitted fabric product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily detect a flaw and a stain by imaging a circular knitted fabric product in a stretched state in which a light-guiding plate is inserted and comparing its binary image obtained through image processing with a binary image of a flawless article of the same product as the above product. SOLUTION: A finish-turn inspection tool 10 for a circular knitted fabric product is fixed on a top plate of a worktable or the like. The circular knitted fabric product such as hosiery is made to board in a stretched state on a light- guiding plate 30 fixed in a case 28 and itself radiating light by outward diffused reflection of incident light passing through a color filter and/or outward irradiation of fluorescence through absorbing light with a fluorescent substance. Multi- gray-scale image obtained by imaging the circular knitted fabric product is treated by binary coded processing and is compared with a binary image obtained by imaging and binary coded processing of a flawless article of the same product as the above detected product to detect defects such as a flaw.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finished inspection tool for circular knitted fabric products, and more particularly to a finished inspection tool for circular knitted fabric products which can easily confirm the presence or absence of scratches or dirt on the circular knitted fabric product.

[0002]

2. Description of the Related Art A circular knitted fabric product such as a sock may have a defect such as a hole in the fabric due to a knitting defect or a sewing defect during a manufacturing process. It was done. Conventionally, to perform this flaw inspection, insert a circular knitted fabric product into a single color flat plate made of synthetic resin or the like, stretch the stitch, and check for scratches,
Alternatively, insert a circular knitted fabric product into an inspection tool with a fluorescent lamp inside a cylinder such as a cylinder, stretch the stitches, and illuminate the interior with a fluorescent lamp to check for flaws and perform a flaw inspection. I was going. Further, with respect to the dirt adhered to the circular knitted fabric product, the dirt was inspected visually using the above-described inspection tool or the like.

[0003]

However, when inspecting for scratches or dirt using a monochromatic flat plate or the like, the inspection cannot be performed reliably because it is not easy to find the scratches and the like. Even when it was done, it took a lot of time and the work efficiency was very poor. In addition, when performing a flaw inspection using a tube equipped with a fluorescent lamp, the flaws can be easily found compared with the case of using a monochromatic flat plate, but dirt attached to the outside of the product is difficult to see due to lighting. Had become. Furthermore, since the outer diameter of the tube becomes large due to the structure of the interior of the fluorescent lamp, it becomes difficult to detach and attach the circular knitted fabric product, so that the overall working time cannot be shortened, and the method described above is used. Similarly, work efficiency was poor.

[0004] Therefore, a main object of the present invention is to provide a circular knitted fabric finish inspection which can easily mount a circular knitted fabric product and can surely confirm the presence or absence of scratches and dirt on the circular knitted fabric product. Is to provide tools.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a finish inspection tool for circular knitted fabric products inserted and used in circular knitted fabric products such as socks, and a light guide plate inserted in the circular knitted fabric products. And a light source for making light incident on the light guide plate. The light guide plate diffusely reflects light incident from the end face closest to the light source in an outward direction and / or absorbs light with a fluorescent substance to emit fluorescence. This is a finish inspection tool for circular knitted fabric products, which emits light by emitting light in the outward direction. Thereby, illumination is given from inside the circular knitted fabric product.

In the present invention, a light guide plate having a size such that the circular knitted fabric product is in a stretched state may be inserted. Thereby, the inspection is performed in a state where the circular knitted fabric product is stretched.

In the present invention, a color filter for changing the color of light may be provided between the light source and the end face of the light guide plate closest to the light source. Thereby, the color of the circular knitted fabric product and the color of the light emitted from the light guide plate can be clearly different.

Further, according to the present invention, an image pickup means for picking up a circular knitted fabric product with a light guide plate inserted therein to obtain a multi-tone image, and an image processing of the multi-tone image for scratching the circular knitted fabric. And a flaw detecting means for detecting the presence or absence of the flaw. As a result, a uniform inspection by image processing is performed instead of a visual inspection by a human.

Still further, according to the present invention, the flaw detecting means includes a binarizing means for binarizing the multi-tone image,
Recording means for recording a binarized image showing a state in which a light guide plate of a circular knitted fabric product of the same type as the object to be inspected and free of scratches and dirt is inserted, and a multi-tone image obtained by the image pickup means.
The image processing apparatus may further include a flaw detection unit that detects a flaw by detecting a difference between the binarized image generated by the binarization processing and the binarized image recorded in the recording unit. This makes it possible to perform an inspection of a single color or a knitted pattern that is not complicated by image processing.

In the present invention, the flaw detecting means includes a color map generating means for generating a color map in which the RGB values of each pixel of the multi-tone image are recorded, and a circular knit which is of the same type as the object to be inspected and has no flaws and dirt. Recording means for recording a color map of a color image showing a state in which the light guide plate of the dough product is inserted,
It may have a flaw detecting means for detecting a flaw by detecting a difference between the color map of the multi-tone image obtained by the imaging means and the color map recorded in the recording means. This makes it possible to inspect even complicated color patterns and knitted patterns by image processing.

Further, in the present invention, incident light blocking means for blocking light from the light source to the light guide plate, and illuminating means for externally illuminating the circular knitted fabric product with the light guide plate inserted therein, An image pickup means for picking up a multi-tone image of the circular knitted fabric product illuminated by the illuminating means, and a stain detecting means for detecting the stain of the circular knitted fabric product by processing the multi-tone image. Is also good. As a result, an inspection by image processing can be performed on the dirt adhered to the outside of the product.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0013]

FIG. 1 is an illustrative view showing one embodiment of a finished inspection tool for a circular knitted fabric product according to the present invention. The circular knitted fabric product finish inspection tool 10 includes a fixture 12 for fixing the circular knitted fabric product finish inspection tool 10 to a work board or the like. The fixing device 12 includes an upper plate 12
a, a middle plate portion 12b and a lower plate portion 12c. As shown in FIG. 1, the top plate and the like are formed in a U-shape so that a top plate or the like can be fitted therein. Lower plate 12c of fixture 12
Is screwed with a pinching screw 14. The clamping screw 14 is formed with a circular pressing plate 14a at the upper part and a handle 14b at the lower part. The fixture 12 includes a handle 14
By rotating b, the screwing position of the pinching screw 14 is displaced upward, and the top plate 12a and the pressing plate 14a clamp the top plate or the like to be fixed.

A substantially rectangular side plate 16a and a side plate 16a are formed on both ends of the upper plate 12a in the longitudinal direction.
b is formed. A support shaft 18 is horizontally installed between the side plates 16a and 16b such that one end is fixed to the inner surface of the side plate 16a and the other end is inserted through the side plate 16b. A screw groove (not shown) is provided in a portion of the support shaft 18 protruding from the side plate 16b, and an adjusting screw 20 is screwed into the groove. The adjusting screw 20 can bend the side plate 16a and the side plate 16b inward by adjusting the screwing position with the screw groove.

A turntable 22 is provided between the side plates 16a and 16b so as to be rotatable about the support shaft 18. The turntable 22 is formed to have a width slightly smaller than the interval between the inner surface of the side plate 16a and the inner surface of the side plate 16b. When the adjustment screw 20 is loosened, the turntable 22 is turned. When the adjusting screw 20 is tightened, the turntable 22 is sandwiched between the side plates 16a and 16b, so that the turntable 22 cannot rotate.

A shaft 24 is formed upward at the center of the upper surface of the turntable 22. The shaft 24 is formed of a cylindrical pipe or the like, and the power cord 26 drawn into the side plate 16b and the turntable 22 can be drawn inside. A case 28 is provided above the shaft 24. The case 28 has a shaft 24 attached thereto via a bearing or the like, and is rotatable about the shaft 24. The case 28 is a hollow rectangular parallelepiped, and includes a box 28 a and a cover 28.
b.

As shown in FIG. 2, a light guide plate 30 is provided at the center of the upper surface of the box portion 28a, and a lower portion of the light guide plate 30 is held by a holding portion 32 formed inside the box portion 28a. Thereby, the light guide plate 30 is fixed.
A reflector 34 having a U-shaped vertical section is attached to the lower end of the light guide plate 30 so as to cover the lower end of the light guide plate 30. The reflecting plate 30 is for making the light emitted from the cold cathode tube 36 described later efficiently enter the lower end of the light guide plate 30,
The inner surface is mirror-finished so that light not irradiated from the cold cathode tube 36 toward the lower end of the light guide plate 34 is reflected by the reflector 34 and is incident on the lower end of the light guide plate 34 without being absorbed. It has been subjected.

The reflection plate 34 has an inner surface formed of the light guide plate 3.
As shown in FIG. 2, it is attached without providing a space without being closely attached to the lower end of the zero. A cold cathode tube 36 is provided below the inside of the reflection plate 34 so as to face the lower end of the light guide plate 30.
Is arranged. The cold cathode tube 36 is, as described above,
A light source for making light incident on the lower end of the light guide plate 30,
The lower end of the light guide plate 30 and the surface of the cold cathode tube 36 are arranged in parallel. This is to ensure that light is uniformly incident toward the lower end of the light guide plate 30. The cold cathode tube 36 can emit light when a driving voltage is applied from a rotating terminal 38 provided inside the box 28a. It should be noted that the rotating terminal 38 is not physically connected to a conducting wire or the like for supplying a driving voltage and a terminal portion by an electric wire or the like, but is electrically connected by surface contact, point contact, or the like. A terminal having a structure in which a drive voltage is always supplied even when rotated, and in this embodiment, the drive voltage supplied from the power cord 26 is electrically connected by surface contact, point contact, or the like, A drive voltage is supplied to the rotation terminal 38.

Here, the light guide plate 30 will be described in detail. As shown in FIG.
Contains 0. The fluorescent sheet 40 is a polyester sheet, a polycarbonate sheet or an acrylic sheet coated with a fluorescent substance. In this embodiment, the fluorescent sheet made of the above-mentioned material is used. However, the present invention is not limited to this, and a sheet made of paper, plastic, or the like may be used as long as the sheet contains or is coated with a fluorescent substance. It is possible.

The transparent acrylic plate 42a and the transparent acrylic plate 42b are laminated so as to cover the front and back surfaces of the fluorescent sheet 40. Transparent acrylic board 42
The transparent acrylic plate 42a and the transparent acrylic plate 42b are formed of a flat plate made of colorless and transparent acrylic having a thickness that does not easily deform. Light is incident on the transparent acrylic plate 42a and the transparent acrylic plate 42b from the lower ends thereof from the cold cathode tubes 36.
The light irradiated at an angle smaller than the obtuse angle with respect to the outward surface of the transparent acrylic plate 42a and the transparent acrylic plate 42b is repeatedly reflected toward the upper ends of the transparent acrylic plate 42a and the transparent acrylic plate 42b without being emitted to the outside. It is configured to move. The reflected light is absorbed by the fluorescent sheet 40 or is irregularly reflected on the way to the upper ends of the transparent acrylic plate 42a and the transparent acrylic plate 42b, so that the outward faces of the transparent acrylic plate 42a and the transparent acrylic plate 42b. That is, the light is emitted toward the surface in contact with the circular knitted fabric product, and as a result, the light guide plate 30 emits light by itself.

Further, on the surfaces of the transparent acrylic plates 42a and 42b facing the fluorescent sheet 40, as shown in FIG. 4 and the like, the fluorescent light emitting portions 44a and 44b are provided with a solution containing a fluorescent substance. The pigment is formed by coating and printing. The fluorescent light emitting section 44a and the fluorescent light emitting section 44b
The light guide plate 30 emits more intense fluorescent light, so that the same brightness can be obtained even on a surface located at a position different from that of the cold-cathode tube 36 as a light source, so that the entire surface of the light guide plate 30 has a uniform brightness. Is what you do.

Therefore, as shown in FIGS. 5, 6, and 7, the fluorescent light emitting section 4 located near the cold cathode tube 36 is provided.
4a and the dots constituting the fluorescent light emitting portion 44b are formed to have a small area, and the dots at distant positions are formed to have a large area so that the same luminance can be obtained even on a surface at a position different from the cold cathode tube 36. ing. In this embodiment, the shape of the dots forming the fluorescent light emitting portions 44a and 44b is circular. However, the present invention is not limited to this, and a uniform luminance can be obtained on the entire surface of the light guide plate 30. For example, other shapes such as a triangle, a square, a star, and a cross may be used.

The outer shape of the light guide plate 30 will be described. In this embodiment, all of the fluorescent sheet 40, the transparent acrylic plate 42a and the transparent acrylic plate 42b are elongated and the upper end is formed in an inverted U-shape. . The surface is formed smoothly. This is because the circular knitted fabric product such as a sock or the like to be inspected can be easily attached to and detached from the light guide plate 30. Further, the outer circumference of the light guide plate 30 is preferably formed to be longer than the inner circumference of the circular knitted fabric product to be inspected. This is because when the circular knitted fabric product is put on the light guide plate 30, the stitches of the circular knitted fabric product are elongated, and the flaw inspection can be easily performed. The length of the fluorescent sheet 40 is shorter than that of the transparent acrylic plate 42a and the transparent acrylic plate 42b, so that the fluorescent sheet 40 is not positioned near the cold cathode tube 36. This is because, when a circular knitted fabric product such as a sock is mounted on the light guide plate 36, light is emitted by the fluorescent sheet 40 in a portion where the circular knitted fabric product does not exist from the outward faces of the transparent acrylic plate 42a and the transparent acrylic plate 42b. This is to prevent the illumination efficiency from being reduced by the radiation.

As shown in FIG. 2, the box 28a and the reflecting plate 34 have slits 28c and slits 3 respectively.
4a are formed. The slit 28c and the slit 34a are provided with a color filter 46 from the outer surface of the box 28a.
Are inserted between the lower end of the light guide plate 30 and the cold cathode tubes 36. The color filter 46 is a plate made of a colored transparent or colorless transparent acrylic plate or a glass plate, and has a function of changing the color of light emitted from the cold cathode tube 36 toward the lower end of the light guide plate 30. It is. Thus, the color of the light emitted from the light guide plate 30 can be easily changed only by replacing the color filter 46.

In the embodiment according to the present invention, the circular knitted fabric product such as a sock can be easily attached to and detached from the light guide plate 30 as shown in FIG. In addition, if the circular knitted fabric product has a flaw such as a hole due to emission of light from the light guide plate 30, the flaw can be quickly found because the part is brighter than the peripheral part. Further, in this embodiment, since the color of the light emitted from the light guide plate 30 can be changed by replacing the color filter 46, the color of the circular knitted fabric product and the color of the light emitted by the light guide plate 30 are close to complementary colors. In this case, the boundary between the circular knitted fabric product and the light guide plate 30 can be clearly recognized, and the flaw can be found more quickly.

Next, another embodiment of the circular knitted fabric finishing inspection tool according to the present invention will be described. In addition,
FIG. 9 is a schematic top view showing another embodiment of the circular knitted fabric product finish inspection tool according to the present invention, and FIG.
FIG. 10 is an illustrative side view of the embodiment shown in FIG. 9.

This embodiment 100 includes a circular rotary worktable 50. A rotary table 52 that is rotated by a drive motor (not shown) is formed on the upper part of the rotary worktable 50. A plurality of through holes 54 are formed in the turntable 52 in the same circumference. In each of the through holes 54, a rotatable rotation fixture 56 is installed, and the light guide plate 30 used in the above-described embodiment is fixed to the upper part thereof. The light guide plate 30 is fixed inside the rotary worktable 50 so that its lower end is exposed, and the color filter 46 is attached to the rotation fixture 56 so that the color filter 46 is disposed immediately below the lower end of the light guide plate 30. Is configured to be inserted.

A plurality of lamps 56 are arranged inside the rotary worktable 50 at positions on the same circumference as the through holes 54.
The lamp 56 is installed such that the light irradiation direction is directed upward, and is configured to efficiently irradiate the lower end of the light guide plate 30 with light. The inside of the rotary worktable 50 is provided with a mirror or a mirror-finished metal plate so as to improve the lighting efficiency.

In this embodiment, in addition to the effects obtained in the above-described embodiment, since the work required for the flaw inspection work can be performed by a plurality of persons in a flow operation, the flaw inspection work can be performed more efficiently. It is possible to do.

Next, still another embodiment of the finished inspection tool for circular knitted fabric according to the present invention will be described. FIG. 11 is a schematic top view showing another embodiment of the finished inspection tool for a circular knitted fabric product according to the present invention, and FIG. 12 is a schematic side view of the embodiment shown in FIG.

The embodiment 150 includes a circular rotary worktable 152. On the upper part of the rotary worktable 152, a rotary table 154 is formed which is rotated by a fixed angle manually or automatically by a drive motor (not shown) at regular intervals.
In addition, in this embodiment, it is comprised so that it may rotate every 60 degrees. The rotary table 154 has a plurality of through holes 156 formed at a constant interval on the same circumference around the center of the rotary table 154. Note that, in this embodiment, similar to the angle at which the rotary table 154 rotates, 6
Through holes 156 are provided at 0 degree intervals.

The through hole 156 is provided with a rotatable rotation fixture 158, and the light guide plate 30 used in the above-described embodiment is fixed to an upper portion thereof. The light guide plate 30 is fixed inside the rotary worktable 50 so that its lower end is exposed, and the color filter 46 is attached to the rotation fixture 56 so that the color filter 46 is disposed immediately below the lower end of the light guide plate 30. Is configured to be inserted.

A light source unit 160 is installed inside the rotary worktable 50. The light source unit 160 is a unit that emits light having an arbitrary wavelength. The light emitted from the light source unit 160 is transmitted through the optical fiber 162 every time the rotary table 154 rotates.
The light guide plate 3 is irradiated to only one of the portions where the light guide plate 6 is disposed.
0 is incident on the lower end. Thus, the light guide plate 30 is configured to emit light only when it is arranged at an arbitrary position by being rotated by the turntable 154.
The light source unit 160 is provided with a light-shielding device (not shown), and can arbitrarily shut off the supply of light.

A color CCD camera 1 is provided before and after the light guide plate 30 disposed at the position where the light guide plate 30 emits light.
64 are installed. The color CCD camera 164 is
A multi-tone image of the circular knitted fabric product with the light guide plate 30 inserted is captured. The color CCD camera 164 is installed so as to only move up and down by a vertically moving unit (not shown) without interlocking with the rotation of the turntable 154. The color CCD camera 164 performs one of upward and downward operations by the vertical movement unit at the time of imaging, and captures a multi-tone image of the entire circular knitted fabric product. When the light guide plate 30 is disposed at a position where the light guide plate 30 emits light, the rotation fixture 158 is operated by a lock mechanism (not shown) so that the front and back surfaces of the light guide plate 30 always face the color CCD camera 164 at the same angle. The rotation is locked.

An illuminator 165 is provided near the color CCD camera 164. The lighting fixture 166 is
The circular knitted fabric product into which the light guide plate 30 is inserted is illuminated from outside. When illuminated by the lighting fixture 166, the light from the light source unit 160 is blocked by the light shielding device, and the lighting is performed only by the lighting fixture 166.

An image processing device 166 is connected to the color CCD camera 164. The image processing device 166 includes:
The multi-tone image of the circular knitted fabric product imaged by the color CCD camera 164 is appropriately processed to determine whether the circular knitted fabric product has scratches or dirt. Hereinafter, each processing unit included in the image processing device 166 will be described with reference to FIG.

The image processing device 166 has a smoothing processing section 166a for smoothing a multi-tone image. Smoothing processing unit 1
Reference numeral 66a has a function of removing noise included in the multi-tone image captured by the color CCD camera 164, and converting the image into an image in which fine fluctuation of density gradation for each pixel is eliminated.

The smoothing section 166a is connected to a binarizing section 166b. The binarization processing unit 166b
It has a function of subjecting the smoothed multi-tone image to binarization processing and converting it to binary image data using an appropriate binarization threshold value.

Further, a color map generator 166a is connected to the smoothing processor 166a. Color map generator 1
66a is the RG of each pixel of the smoothed multi-tone image.
It has a function of recording the B value and generating color map data.

A standard data recording unit 166d is connected to the binarization processing unit 166b and the color map generation unit 166a. The standard data recording unit 166d includes the binarization processing unit 1
It has a function of recording the binary image data or the color map data generated by being processed by the color map generation unit 66b or the color map generation unit 166a. The data recorded in the standard data recording unit 166d is binary image data or color map data of a circular knitted fabric product having no scratches or dirt, and this data is read out by a scratch / dirt determining unit 166e described later as appropriate. The circular knitted fabric product to be inspected is used as reference data for judging whether or not the product has no scratches or dirt.

Binarization processing section 166b, color map generation section 1
The flaw / dirt determination unit 166e is connected to the reference data recording unit 66a and the standard data recording unit 166d. The scratch / dirt determining unit 166e stores the binary image data or color map data of the circular knitted fabric product having no scratches and dirt stored in the standard data recording unit 166d, and the binary image data of the inspected circular knitted fabric product. It has a function of detecting a difference from the data or the color map data and determining whether or not the inspected circular knitted fabric product has any scratches or dirt.

A display unit 166f is connected to the scratch / dirt determination unit 166e. The display unit 166f is
The result of the presence / absence of scratches / dirt is determined by the dirt determining unit.

The operation of the circular knitted fabric finishing inspection tool 150 will be described below.

First, as shown in the flowchart of FIG. 14, a circular knitted fabric product of the same type as the circular knitted fabric product to be inspected and free from scratches and dirt is mounted on an arbitrary light guide plate 30. When mounting, the cloth is mounted in a stretched state so as not to cause slack (Step S1).

Next, the turntable 154 is manually or automatically rotated so that the light guide plate 30 on which the circular knitted fabric product is mounted is positioned to a position where the light guide plate 30 emits light. Then, in a state where the light guide plate 30 emits light, while the color CCD camera 164 is lowered by the vertical movement unit, as shown in FIG. 15, the multi-tone images of the front and back surfaces of the circular knitted fabric product are captured (step S2). ).

The multi-tone image picked up by the color CCD camera 164 is subjected to smoothing processing by removing noise by the smoothing processing section 166a (step S3).

The multi-tone image subjected to the smoothing process is binarized by a binarization processing section 166b to generate binarized image data as shown in FIG. 16 (step S4).

The binarized image data obtained in step S4 is stored in the standard data recording section 166d (step S5).

Next, the light is blocked by the light shielding device, and the light guide plate 30 stops emitting light. Then, it is illuminated by the illumination tool 166 so that light is applied from the outside. In a state where the circular knitted fabric product is illuminated from the outside, the color CCD camera 164 is raised by the vertical movement unit, and multi-tone images on both front and back surfaces of the circular knitted fabric product are captured (step S6).

The multi-tone image picked up by the color CCD camera 164 is subjected to smoothing processing by removing noises by the smoothing processing section 166a (step S7).

The smoothed multi-tone image is binarized by a binarization processing section 166b to generate binarized image data (step S8).

The binarized image data obtained in step S4 is stored in the standard data recording section 166d (step S9).

The steps from step S1 to step S9 are steps for creating standard data for making the judgment of the finish of the circular knitted fabric product to be inspected by the scratch / dirt judgment section 166e. This step may be performed in advance for all circular knitted fabric products to be inspected by the circular knitted fabric finish inspection tool 150, and all the standard data may be recorded in the standard data recording unit 166d.

Next, as shown in the flowchart of FIG. 17, a circular knitted fabric product to be inspected is mounted on an arbitrary light guide plate 30 in the same manner as when the standard data was previously obtained (step S10).

In the same manner as in step S2, the light guide plate 30 on which the circular knitted fabric product is mounted up to the position where the light guide plate 30 emits light.
Is rotated manually or automatically so that is positioned. When the light guide plate 30 emits light, the color CCD camera 1 is moved by the vertical movement unit.
As shown in FIG. 18, a multi-tone image is captured while the number 64 is lowered (step S11).

The multi-tone image picked up by the color CCD camera 164 is subjected to smoothing processing by removing noise by the smoothing processing section 166a (step S12).

The smoothed multi-tone image is binarized by a binarization processing section 166b to generate binarized image data as shown in FIG. 19 (step S1).
3).

The generated binarized image data is sent to the scratch / dirt determining section 166f. Scratch and dirt judgment part 1
At 66f, the binarized image data received at step S13 is compared with the standard data generated at step S4 recorded in the standard data recording unit 166d, and the circular knitted fabric to be inspected is determined based on the difference. It is determined whether or not the product is flawed (step S14). Step S
13 and the standard data recording unit 1
The difference from the standard data recorded in 66d fluctuates depending on the state of attachment to the light guide plate 30 and the illumination environment. Is desirable.

Next, as in step S6, the light is blocked by the light blocking device, and the light guide plate 30 stops emitting light. Then, it is illuminated by the illumination tool 166 so that light is applied from the outside. While the circular knitted fabric product is illuminated from the outside, the color CCD camera 164 is raised by the vertical movement unit, and multi-gradation images on both the front and back surfaces of the circular knitted fabric product are captured (step S15).

The multi-tone image picked up by the color CCD camera 164 is subjected to smoothing processing by removing noises by the smoothing processing section 166a (step S16).

The smoothed multi-tone image is binarized by a binarization processing section 166b to generate binarized image data (step S17).

The binarized image data generated in step S18 is sent to the scratch / dirt determining section 166f. In the scratch / dirt determination unit 166f, the binarized image data received in step S18 and the standard data recording unit 166d
Is compared with the standard data generated in step S8, and the presence or absence of dirt in the circular knitted fabric product to be inspected is determined from the difference (step S18).
When there are a plurality of circular knitted fabric products to be inspected, the processes from step S10 to step S18 are repeated by the number of circular knitted fabric products to be inspected. Further, the binarized image data received in step S18 and the standard data recording unit 166d
Is different from the standard data recorded in step S1.
As in the case of No. 4, it varies depending on the state of attachment to the light guide plate 30 and the lighting environment, but it is desirable that the presence or absence of dirt is determined with an appropriate width based on the results of experiments and the like.

The processing shown in steps S1 to S18 can be applied to the case where the circular knitted fabric product is a single-colored product or a knitted pattern is not complicated. In the case of an object that has been knitted or has a complicated knitted pattern, it is desirable to determine the presence or absence of scratches and dirt by the processing shown in FIGS. In the processing shown in FIGS. 20 and 21, the step of generating the binarized image data by the binarization processing section 166b in the processing shown in FIGS. 14 and 17 is performed by the color map data generation section 166c. This is replaced by the step of generating color map data as shown in FIG. 22, and the standard data recorded in the standard data recording unit 166e is replaced by color map data. This makes it possible to determine the presence or absence of scratches and dirt on the multi-tone image, even for items for which it was difficult to determine the presence or absence of scratches and dirt due to the effect of the color tone of the color thread. The presence or absence can be determined.

In the embodiment described above, the light guide plate 30 having a flat plate shape and the upper end formed in an inverted U-shape is used. However, the present invention is not limited to this, and is suitable for the shape of a circular knitted fabric product to be subjected to a flaw inspection. 23, a light guide plate 30a simply formed in a flat plate shape as shown in FIG. 23, a light guide plate 30b formed in an arc-shaped cross section as shown in FIG.
Light guide plate 30c having a rounded top end
Alternatively, a light guide plate 30d obtained by branching a light guide plate into two branches as shown in FIG. 26, or a light guide plate 30e formed in a cylindrical shape as shown in FIG. 27 may be used. Further, as shown in FIG. 28, a light guide plate 30f shaped so that the sock is flattened from the side direction, or as shown in FIG. 29, a substantially semicircular part of the edge of the light guide plate shown in FIG. Light guide plate 3 provided with projections
0 g may be used. That is, when the circular knitted fabric product to be inspected is mounted on the light guide plate 30, the light guide plate 30 may have a shape that does not loosen a part of the fabric.

In the two embodiments described above, the fluorescent sheet 40, the fluorescent light emitting portion 44a, and the fluorescent light emitting portion 44b are formed as the light emitting portion of the light guide plate 30, but the brightness differs depending on the light emitting portion. If glare occurs, sheets may be laminated on the surface of the light guide plate 30 to diffuse light.

Further, in the above two embodiments, the fluorescent sheet 40, the fluorescent light emitting portion 44a and the fluorescent light emitting portion 44b are formed as the light emitting portions of the light guide plate 30, but the transparent acrylic plate 42a and the transparent acrylic Board 4
If the surface of the light guide plate 30 is configured to emit light with uniform luminance by incorporating a fluorescent substance or a substance that diffusely reflects light inside 2b, the fluorescent sheet 40,
It is not necessary to form the fluorescent light emitting portions 44a and 44b.

Further, as a light source for irradiating light to the lower end of the light guide plate 30, a linear light source such as a cold cathode tube is preferably used so as to face the lower end of the light guide plate 30,
The invention is not limited thereto, and a non-linear light source such as an incandescent lamp may be used as long as the light guide plate 30 can emit light with sufficient luminance. Further, as shown in FIG. 30, a plurality of light guide plates may be configured to emit light using a plurality of light source units.

In this embodiment, no image processing is performed on the binarized image data, but the thickness of the line segment included in the binarized image data is reduced to one pixel. May be used to determine whether or not there is a flaw or dirt on the basis of only line features included in the binary image data.

[0069]

According to the circular knitted fabric finishing inspection tool of the present invention, circular knitted fabric products such as socks can be easily attached and detached, and scratches and dirt can be easily found. A finish inspection tool for dough products can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a circular knitted fabric product finish inspection tool according to the present invention.

FIG. 2 is an illustrative sectional view showing the inside of a case.

FIG. 3 is an illustrative sectional view showing a light guide plate.

FIG. 4 is a front view showing a light guide plate.

FIG. 5 is a partially enlarged view of an arrow AB portion shown in FIG. 4;

FIG. 6 is a partially enlarged view of an arrow AC portion shown in FIG. 4;

FIG. 7 is a partially enlarged view in which an arrow AD part shown in FIG. 4 is enlarged.

FIG. 8 is a schematic perspective view showing a use state of the circular knitted fabric product finish inspection tool according to the present invention.

FIG. 9 is a schematic top view showing another embodiment of the finished inspection tool for a circular knitted fabric product according to the present invention.

FIG. 10 is an illustrative side view of the embodiment shown in FIG. 9;

FIG. 11 is a schematic top view showing still another embodiment of the circular knitted fabric product finish inspection tool according to the present invention.

FIG. 12 is an illustrative side view of the embodiment shown in FIG. 11;

FIG. 13 is a block diagram illustrating an image processing apparatus.

FIG. 14 is a flowchart illustrating an example of an operation for generating standard data of a circular knitted fabric product having a simple monochrome or a knitted pattern with a circular knitted fabric finish inspection tool.

FIG. 15 is a diagram showing a multi-tone image of a circular knitted fabric product without scratches and dirt.

FIG. 16 is an illustrative view showing binarized image data of a circular knitted fabric product without scratches and dirt;

FIG. 17 is a flowchart illustrating an example of an operation of inspecting a circular knitted fabric product.

FIG. 18 is a diagram showing a multi-tone image of a circular knitted fabric product to be inspected.

FIG. 19 is an illustrative view showing binarized image data of a circular knitted fabric product to be inspected;

FIG. 20 is a flowchart illustrating an example of an operation of generating standard data of a circular knitted fabric product having a complicated colored pattern or knitted pattern using the circular knitted fabric finish inspection tool.

FIG. 21 is a flowchart illustrating an example of an operation of inspecting a circular knitted fabric product having a complicated colored pattern or knitted pattern.

FIG. 22 is an illustrative view showing a data structure of color map data;

FIG. 23 is a perspective view showing a flat light guide plate.

FIG. 24 is a perspective view showing a light guide plate having a circular arc cross section.

25 is a perspective view showing a light guide plate in which an upper end of the light guide plate shown in FIG. 24 is rounded.

FIG. 26 is a perspective view showing a forked light guide plate.

FIG. 27 is a perspective view showing a cylindrical light guide plate.

FIG. 28 is a perspective view showing a light guide plate having a shape in which a sock is flattened from a side direction.

FIG. 29 is a perspective view showing a light guide plate in which a substantially semicircular protrusion is provided at a part of an edge of the light guide plate shown in FIG. 4;

FIG. 30 is an illustrative side view of an embodiment in which a plurality of light source units are provided.

[Explanation of symbols]

 10, 100, 150 Finish inspection tool for circular knitted fabric product 30 Light guide plate 36 Cold cathode tube 40 Fluorescent sheet 42a, 42b Transparent acrylic plate 44a, 44b Fluorescent light emitting section 165 Color CCD camera 166 Image processing device

Claims (7)

[Claims] 1. A finish inspection tool for a circular knitted fabric product inserted and used in a circular knitted fabric product such as a sock or the like, comprising: a light guide plate inserted into the circular knitted fabric product; The light guide plate emits fluorescent light in an outward direction by diffusely reflecting light incident from an end face closest to the light source in an outward direction and / or absorbing the light into a fluorescent substance. By letting
A finish inspection tool for circular knitted fabric products that emits light by itself. 2. The circular knitted fabric product finish inspection tool according to claim 1, wherein the light guide plate is inserted into the circular knitted fabric product to expand the circular knitted fabric product. 3. The circular knitted fabric product finish inspection according to claim 1, further comprising a color filter that changes the color of light between the light source and the end face of the light guide plate closest to the light source. Tools. 4. An imaging means for imaging a circular knitted fabric product in which the light guide plate is inserted to obtain a multi-tone image, and performing image processing on the multi-tone image to determine whether or not the circular knitted fabric is flawed. The finish inspection tool for a circular knitted fabric product according to any one of claims 1 to 3, further comprising a flaw detection means for detecting a flaw. 5. The flaw detection means includes: a binarization means for binarizing a multi-tone image; and the light guide plate of a circular knitted fabric product of the same type as the object to be inspected and free from scratches and dirt. Recording means for recording a binarized image indicating a state; a binarized image generated by performing binarization processing on a multi-tone image obtained by the imaging means; and a binarized image recorded in the recording means 5. The finish inspection tool for circular knitted fabric products according to claim 4, further comprising a flaw detecting means for detecting a flaw by detecting a difference from the flaw detection. 6. The flaw detecting means includes: a color map generating means for generating a color map in which RGB values of each pixel of a multi-tone image are recorded; and a circular knitted fabric product of the same type as the inspection object and free from scratches and dirt. Recording means for recording a color map of a color image indicating a state in which the light guide plate is inserted, and a difference between a color map of a multi-tone image obtained by the imaging means and a color map recorded in the recording means. The finished inspection tool for circular knitted fabric products according to claim 4, further comprising: a scratch detection unit configured to detect a scratch by detecting a crack. 7. An incident light blocking unit for blocking light from entering the light guide plate from the light source, an illuminating unit for externally illuminating a circular knitted fabric product in which the light guide plate is inserted, and the illumination Imaging means for capturing a multi-tone image of the circular knitted fabric product illuminated by means, and dirt detection means for performing image processing on the multi-tone image to detect dirt on the circular knitted fabric product. A finish inspection tool for a circular knitted fabric product according to any one of claims 4 to 6.