JP2017128832A - Woven fabric on-line inspecting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a woven fabric on-line inspecting apparatus which has a simple structure and can be easily installed, and which can highly accurately inspect woven fabrics in all looms even when the number of the looms is increased.SOLUTION: A woven fabric on-line inspecting apparatus 100 comprises: image taking sections 110a-d which are provided respectively on a plurality of looms 300a-d, and which comprise image taking devices 111a-d for taking the images of woven fabrics manufactured in the looms 300a-d and movement mechanisms 113a for moving the image taking devices in a width direction of the woven fabrics; one defect detecting section 120 which receives image data from the image taking devices of the image taking sections 110a-d on the looms 300a-d, and which, on the basis of the image data, detects a defect in each of the woven fabrics; and one control section 130 which, on the basis of information on the width and the weaving speed of each of the woven fabrics in the looms 300a-d and information on the image taking range of each of the image taking devices, controls the movement of each of the image taking devices by each of the movement mechanisms 113a and the image taking timing of each of the image taking devices. The woven fabrics are inspected by the woven fabric on-line inspecting apparatus 100. The image taking range of each of the image taking devices becomes a relatively narrow range, so that all the looms 300a-d are highly accurately inspected by the inspecting apparatus.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an inspection device that inspects online for the presence or absence of defects in a woven fabric produced by each of a plurality of looms.

  Looms for manufacturing industrial woven fabrics such as filter woven fabrics are generally provided with an on-line inspection device for inspecting defects such as thread breaks and holes generated in the manufactured woven fabrics on the spot. Some of these inspection apparatuses inspect the presence or absence of defects in the woven fabric by photographing the surface of the woven fabric sent out from the loom and analyzing the obtained image data.

  Since industrial woven fabrics have a low unit price, the cost of inspection is extremely limited. Patent Document 1 discloses an on-line inspection apparatus that collectively inspects defects of woven fabrics respectively manufactured by a plurality of looms. The inspection apparatus includes a single photographing unit 510 provided above the plurality of looms 520a to 520c, an image processing unit 540 that detects a defect in the woven fabric from image data acquired by the photographing unit 510, and a photographing unit. It has the moving part 530 which moves 510 to the width direction of a woven fabric (FIG. 4).

  In this inspection apparatus, the photographing unit 510 is moved in the width direction of the woven fabric manufactured by the loom 520a, and the surface of the woven fabric is photographed every time the photographing unit 510 moves by the photographing width. Then, the obtained image data is transmitted to the image processing unit 540. The image processing unit 540 performs defect inspection by comparing the image data with image data of a normal woven fabric stored in the image processing unit 540 in advance. Thereafter, the photographing unit 510 is moved onto the next looms 520b and 520c, and the woven fabrics manufactured by these looms are similarly inspected for defects, thereby inspecting a plurality of woven fabrics at once. doing.

Japanese Patent Laid-Open No. 05-186939

  In the inspection apparatus described in Patent Literature 1, a plurality of target looms must be aligned side by side, and the arrangement is limited. In addition, as the number of looms increases, the time (interval) from the end of shooting of the woven fabric at each loom to the start of the next shooting becomes longer, so a wide range must be shot at each loom. Don't be. This leads to a decrease in inspection accuracy.

  The problem to be solved by the present invention is a woven fabric online inspection device that is relatively simple in structure and installation, and that can accurately inspect woven fabrics in all looms even when the number of looms increases. Is to provide.

The woven fabric online inspection device according to the present invention, which has been made to solve the above problems,
a) a photographing unit that is provided in each of the plurality of looms, and that includes a photographing machine that photographs the woven fabric manufactured by the loom, and a moving mechanism that moves the photographing machine in the width direction of the woven cloth;
b) one defect detection unit that receives image data from a photographing machine of each photographing unit of the plurality of looms and detects a defect of the woven fabric based on the image data;
c) Based on information on the width and weaving speed of each of the plurality of looms and information on the photographing range of each photographing machine, the movement of the photographing machine by each moving mechanism and the photographing timing of each photographing machine are controlled. And a control unit.

  In the woven fabric online inspection apparatus according to the present invention, each of the plurality of looms is provided with a photographing unit, and in each photographing unit, the moving mechanism moves the photographing machine in the width direction of the woven fabric under the control of the control unit. Let The control unit determines the moving speed of the photographing machine in each photographing unit based on the information on the width and weaving speed of the woven fabric produced by each loom and the photographing range information of each photographing machine. The movement is controlled and the shooting timing of each camera is controlled. At this time, control is usually performed so that the entire surface of the woven fabric manufactured by the loom is photographed. However, if the entire surface inspection is not necessary, sampling is performed. When photographing the entire surface, the moving speed of the photographing machine is determined so that the photographing machine moves by the length in the width direction of the woven cloth while the woven cloth is manufactured by the length in the weaving direction of the photographing range. At this time, the time required for the photographing machine to return to the original position in the width direction of the woven fabric is also taken into consideration. The defect detection unit detects a defect in the woven fabric manufactured in each loom based on the image data from each photographing machine. The time required to detect defects based on image data (and the time required to shoot one image) is usually required for the camera to move by the length of the woven fabric in the shooting range. Because it is very short (less than 1/10) compared to the time, image data from multiple looms can be processed by a single defect detector, and weaving produced on all looms The cloth can be inspected online.

  According to the woven fabric on-line inspection apparatus according to the present invention, since the photographing unit may be configured for each loom, the arrangement of each loom is arbitrary and can correspond to a large number of looms arranged in various ways. In addition, since each photographic machine reciprocates by the length in the width direction of the woven fabric manufactured by each loom, each photographic machine only needs to shoot a relatively narrow range of woven fabric. It can be performed.

1 is a schematic configuration diagram of a woven fabric online inspection device and a loom according to the present invention. The figure explaining the relationship between the speed which a woven fabric moves, and the imaging range of an imaging device. The figure which shows the processing content and processing timing of an imaging device and PC. The schematic block diagram of the woven fabric online inspection apparatus which concerns on a prior art.

  A woven fabric online inspection apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a woven fabric online inspection device 100 according to an embodiment of the present invention and a plurality of looms 300a to 300d that manufacture a woven fabric that is an inspection target of the woven fabric online inspection device 100. The woven fabric online inspection apparatus 100 includes imaging units 110a to 110d, a defect detection unit 120, a control unit 130, and an image selection unit 150 provided in each of the plurality of looms 300a to 300d.

  A top view of the photographing unit 110a and the loom 300a is shown in FIG. 1 (b), and a side view thereof is shown in FIG. 1 (c). The imaging unit 110a includes an imaging device 111a, an illumination tool 112a, and a moving mechanism 113a. The photographing machine 111a is a camera disposed above the woven cloth 400a, and includes a light receiving element, a lens, and the like arranged two-dimensionally. In the present embodiment, the light receiving element receives a wavelength band of visible light. Each time the imaging trigger signal is sent from the imaging control unit 131, which will be described later, the imaging device 111a ranges between a predetermined length in the width direction (imaging horizontal width) and a predetermined length in the longitudinal direction (imaging vertical width). Shoot. Around the lens of the photographing machine 111a, an illumination tool 112a for irradiating the woven fabric 400a with visible light is attached. The moving mechanism 113a includes a rail 115a extending in the width direction of the woven fabric 400a and a driving mechanism 114a including a motor, a gear, and the like that move along the rail 115a. The photographing machine 111a is attached to the drive mechanism 114a. The imaging units 110b to 110d have the same configuration as the imaging unit 110a.

  The actual state of the defect detection unit 120 and the control unit 130 is a general-purpose computer (PC) 140, which is a mass storage device including a central processing unit (CPU), a memory, a hard disk drive (HDD), a solid state drive (SSD), and the like. Etc. The large-capacity storage device stores in advance a photographing vertical width and a photographing horizontal width, which are photographing ranges of the photographing device. The PC 140 includes a liquid crystal display and the like, and is connected to a display unit 141 that displays various kinds of information and an input unit 142 that includes a mouse and a keyboard and that allows the user to input various instructions. The defect detection unit 120 and the control unit 130 are functional units realized by software by executing a program installed in the PC 140.

  The image selection unit 150 is connected to each of the photographing devices 111a to 111d and the PC 140. The image selection unit 150 transmits a shooting trigger signal to the camera 111 specified by the shooting control unit 131. Further, the image data transmitted from each of the photographing devices 111 a to 111 d is received, and the image data specified by the control signal transmitted from the image control unit 133 is transmitted to the defect detection unit 120.

  The defect detection unit 120 receives the image data sent from the imaging units 110a to 110d via the image selection unit 150, and applies image processing such as binarization and comparison operation to the image data, so that the fabric 400 Detect defects.

  The control unit 130 includes a shooting control unit 131 that controls each of the plurality of photographing machines 111a to 111d, a movement control unit 132 that controls each of the plurality of moving mechanisms 113a to 113d, and an image control unit 133 that controls the image selection unit 150. And a speed calculator 134 for calculating the moving speed of each of the photographing machines 111a to 111d.

  The loom 300a includes a weaving device 310a and a woven fabric winder 320a. The weaving device 310a manufactures a woven fabric 400a having a predetermined width at a constant speed (weaving speed). The woven fabric winder 320a moves the woven fabric 400a manufactured by the weaving device 310a in the weaving direction (the direction of the arrow in FIG. 1C) by winding the woven fabric 400a according to the weaving speed. The looms 300b to 300d have the same configuration.

  Next, the operation of the woven fabric online inspection apparatus 100 will be described with reference to FIGS.

Before operating the woven fabric online inspection apparatus 100, the user inputs the respective weaving speeds of the woven fabrics 400a to 400d of the looms 300a to 300d and the respective widths of the woven fabrics 400a to 400d from the input unit 142 of the PC 140. . The speed calculation unit 134 calculates the moving speed of the photographing devices 111 a to 111 d from the input information and the photographing vertical width and photographing horizontal width of each of the photographing devices 111 a to 111 d stored in the PC 140. Specifically, the time until the end of the upstream side in the weaving direction of the woven fabric 400a in the photographing range photographed at a certain time reaches the position of the downstream end of the photographing range (lower end arrival time). Is calculated from the shooting height and weaving speed. Then, the moving speed at which the photographing machine 111a reciprocates by the length in the width direction of the woven fabric 400a in a time shorter than the lower end arrival time is calculated.
Further, the control unit 130 calculates a value obtained by dividing the photographing horizontal width by the moving speed as a time interval (photographing timing in the present invention) at which each of the photographing devices 111a to 111d is photographed.

  When the woven fabric online inspection device 100 is operated, the photographing machines 111a to 111d of the photographing units 110a to 110d are reciprocated at the above moving speed. In parallel with the reciprocal movement, a shooting trigger signal is sent from the shooting control unit 131 to each of the shooting machines 111a to 111d at different timings for each shooting time interval. Simultaneously with the shooting trigger signal, the image control unit 133 sends a control signal to the image selection unit 150 that causes the defect detection unit 120 to transmit image data from the camera to which the trigger signal has been sent. When the photographing machine receives the photographing trigger signal, it captures the woven fabric of the loom provided with the photographing machine, acquires image data, and transmits the image data to the defect detection unit 120 via the image selection unit 150. To do. The imaging range of the image data acquired by these processes will be described below.

  FIG. 2 shows a photographing range when photographing the woven fabric 400a by the above procedure. The shooting range on the forward path of the photographing apparatus 111a is indicated by areas a1 to an (areas shaded with diagonal lines), and the shooting range on the return path is indicated by areas b2 to bn (area surrounded by a dashed line). The photographing device 111a that has photographed the area a1 moves in the width direction of the woven fabric 400a at the above moving speed, and when the photographing lateral width is moved, the photographing of the area a2 is performed as the second photographing. Since the woven fabric 400a moves in the longitudinal direction while the photographing machine 111a moves, the region a1 and the region a2 are shifted in the weaving direction of the woven fabric 400a by ΔL. Every time shooting is performed, the vertical width ΔL is shifted from the previous shooting position, so that the shift amount in the longitudinal direction of the shooting position and the area a1 gradually increases.

In the woven fabric online inspection apparatus 100, since the moving speed of the photographing machine 111a is set as described above, the photographing machine 111a reciprocates in the width direction of the woven cloth 400a in a shorter time than the lower end arrival time. Return to. As a result, a part of the area a1 photographed at the beginning of the forward path and a part of the area bn photographed at the end of the return path are overlapped (the shift amount is smaller than the photographing vertical width), and the weaving direction of the woven fabric 400a is photographed. In addition, since the photographing time interval is set so that the photographing device 111a performs photographing every time the photographing lateral width moves, the photographing is performed without fail in the width direction of the woven fabric 400a. And after image | photographing the area | region bn, the imaging device 111a image | photographs an outward path again similarly to the area | regions a1-an.
The photographed image data is sent to the defect detection unit 120 via the image selection unit 150 every time photographing is performed. The defect detection unit 120 performs image processing on the received image data to determine the presence or absence of a defect in the woven fabric 400a.

  The photographing machines 111b to 111d also photograph the woven fabrics 400b to 400d, respectively, in the same manner as the photographing machine 111a. FIG. 3 is a timing chart showing the relationship among the photographing in each of the photographing machines 111a to 111d, the transfer of image data from each photographing machine to the defect detection unit 120, and the image processing time by the defect detection unit 120. The imaging control unit 133 transmits imaging trigger signals to the imaging machines 111a to 111d with different timings for each imaging machine. As a result, the image data of each of the photographing devices 111a to 111d is input to the PC 140 in order, and the defect detection unit 120 processes the image data in order. Each time the photographing time interval elapses, the photographing machines 111a to 111d perform processing such as photographing and image transfer to inspect the woven fabric.

  Note that the above embodiment is merely an example, and it is apparent that appropriate modifications and corrections can be made in accordance with the spirit of the present invention. For example, although there are four photographing units and looms, the number may be more or less than this.

  In the above-described embodiment, the image is taken with the image taking device while the image taking device is moved. However, the image taking device may be stopped for each image taking width. By shooting after stopping, image blurring can be prevented and clearer image data can be acquired. In order to perform a full inspection in this configuration, it is necessary to increase the moving speed in accordance with the stop time of the photographing machine. Therefore, the speed calculation unit takes a photograph from the time obtained by subtracting the stop time from the bottom end arrival time and the width of the woven fabric. Calculate the moving speed of the machine. Further, in this configuration, while one photographing machine is stopped and photographing is performed, the movement control unit controls the moving mechanism so that the other photographing machine moves to the next photographing position. Time loss can be minimized and the increase in the moving speed can be suppressed.

  In addition, although shooting is performed on both the forward path and the return path in the movement of the photographing machine, a configuration may be adopted in which shooting is performed only on the forward path. In this configuration, the time required for the round trip can be shortened by setting the moving speed of the return path without photographing to be higher than that of the forward path.

  When the entire inspection of the woven fabric is not necessary, the photographing timing may be made longer than the calculated value or the moving speed may be made slower. By doing so, the amount of image data to be acquired is reduced, and the load on the defect detection unit can be reduced.

  In the above embodiment, each loom and each photographing unit have the same configuration, but the weaving speed of the loom, the length in the width direction of the woven fabric, the photographing range of the photographing machine, etc. differ for each loom or photographing unit. It is good. Even in this case, the woven fabric can be inspected by calculating and controlling the movement speed for each loom or photographing unit in the control unit.

DESCRIPTION OF SYMBOLS 100 ... Woven cloth online inspection apparatus 110 ... Image pick-up part 111 ... Image pick-up machine 112 ... Illuminating tool 113 ... Movement mechanism 120 ... Defect detection part 130 ... Control part 131 ... Image pick-up control part 132 ... Movement control part 133 ... Image control part 134 ... Speed Calculation unit 300 ... loom 310 ... woven fabric manufacturing unit 320 ... woven fabric winding unit 400 ... woven fabric

Claims (3)

a) a photographing unit that is provided in each of the plurality of looms, and that includes a photographing machine that photographs the woven fabric manufactured by the loom, and a moving mechanism that moves the photographing machine in the width direction of the woven cloth;
b) one defect detection unit that receives image data from a photographing machine of each photographing unit of the plurality of looms and detects a defect of the woven fabric based on the image data;
c) Based on information on the width and weaving speed of each of the plurality of looms and information on the photographing range of each photographing machine, the movement of the photographing machine by each moving mechanism and the photographing timing of each photographing machine are controlled. A woven fabric on-line inspection apparatus, comprising: The photographing unit is configured such that the photographing machine photographs the woven fabric in a state where the moving mechanism stops the movement of the photographing machine,
The control unit moves the plurality of movements so that a moving mechanism of another photographing unit moves the photographing device to the next photographing position while the photographing device of one photographing unit among the plurality of photographing units performs photographing. The woven fabric on-line inspection apparatus according to claim 1, wherein the mechanism is controlled. The moving mechanism is configured to reciprocate the photographing machine in the width direction of the woven fabric,
The woven fabric online inspection apparatus according to claim 1 or 2, wherein the photographing machine performs photographing of the woven fabric in both an outward path and a return path.

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