JP2537016B2 - Fabric detection device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for detecting the condition of a cloth, and is particularly suitable for detecting the condition of the cloth during running in a production process.

[0002]

BACKGROUND OF THE INVENTION Cloths are uniform and excellent in quality by satisfying various requirements such as the presence or absence of twisted portions of threads, the presence or absence of flaws on the thread surface, in addition to the cloth density. Whether or not these requirements are satisfied is empirically determined based on, for example, the state of moire fringes formed according to the density of the slits and the cloth of the divided slit group. That is, in the above-mentioned moire fringes, defects caused by twisting or scratches of the thread are in a striped state (for example, a uniform and beautiful striped pattern is disturbed at locations where there are scratches or twists).
Appears. The operator visually judges this change empirically and takes appropriate measures. The state of moire fringes as described above is an extremely important judgment factor in the quality control of cloth. However, in the past, since the cloth was running in the production process, it was not possible to visually grasp the state change represented by the moire fringes as described above. A device having a function of allowing the operator to visually check the state has been developed. Such a device is disclosed in, for example, Japanese Patent Publication No. 4-5780. That is, the device disclosed in the above publication basically captures and captures a still image of moire fringes with a camera and displays it on a CRT screen. However, such a detection device requires various devices such as a camera, a CRT, and an image processing device, which complicates the configuration and inevitably increases the cost. Therefore, when the present invention is intended is more under the simple structure, weft detection DeSo location that can be an operator to easily visually recognized while still moire fringes varies with the state of the yarn constituting the running cloth Is to provide.

[0003]

To achieve the above object, according to the solution to ## weft detection DeSo location according to the present invention is deployed in close proximity to traveling fabric comprises a slit which changes progressively divided Density Moire generating means and 1000 for the running cloth
Strobe means for irradiating intermittent flash of PPM to 5000 PPM to generate flash light rays passing through the moire generating means, and the moire generating means for the warp or weft of the running cloth.
The main point is that it is provided with a driving means that tilts in an arbitrary direction .

[0004]

[Action] with respect to the traveling cloth 1 000ppm (pulse / min)
When a flash light having an appropriate frequency within a range of from 5,000 to 5,000 ppm is irradiated, moire fringes are generated by the flash light when the cloth density of the running cloth and the division density of the slits substantially match, and it remains as an afterimage on the eyes of the operator. This state is 1000p
An appropriate number of pm to 5000 ppm continues intermittently to form an afterimage as a stationary moire fringe for the operator. And
This makes it possible to visually detect the texture density or texture state. Therefore, normally, it is not necessary to strictly synchronize the frequency with the cloth density, and it is possible to set an appropriate value within the above range. However, 1000p
At pm or less, the image tends to be interrupted due to the increase in the moire fringe generation interval, and at 5000 ppm or more, it is equivalent to continuous irradiation of light due to the influence of flash light other than the opportunity to generate moire fringes, and in each stationary state. It has been confirmed by an experiment that it is difficult to observe the moire fringes of. Operation
While observing the moire fringes described above, the
The moire generating means is tilted in the direction of the tilt of the moire fringes.
This tilt angle indicates the tilt of the fabric due to the warp and weft of the fabric.
You. As a result, the defects of the texture are extracted.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the accompanying drawings for the understanding of the present invention. The following embodiments are examples of embodying the present invention and are not intended to limit the technical scope of the present invention. Here, FIG. 1 is a block diagram showing a schematic structure of a cloth detecting device according to an embodiment of the present invention, and FIG. 2 is a plan view of a moire generating means constituting the cloth detecting device. As shown in FIGS. 1 and 2, a cloth detection device 1 according to this embodiment includes a moire generating means 3, a strobe means 4, a driving means 5, an enlarging means 6, and a control device 7. It is configured. The moire generating means 3 is provided with slits whose division density gradually changes from one end side to the other end side on the transparent substrate. In this case, due to the interference between the light rays from the cloth 2 that has passed through the moire generating means 3 and the slits, moire fringes are formed in accordance with the density of, for example, the weft threads and the warp threads constituting the running cloth 2. The moire fringes formed when the yarn direction and the slit direction are parallel are shown in FIG.
FIG. 2B shows moire fringes formed when the slit direction is inclined with respect to the yarn direction.

In the moire fringes formed as described above, light does not interfere at the portion where the thread density and the slit density match (no moire fringes occur), and the amount of light transmission in this portion is the moiré fringes. Contrary to the part that occurred, it becomes the maximum. Therefore, a scale corresponding to the thread density is provided in advance along the direction perpendicular to the slit, and the scale corresponding to the center point of the space portion where the amount of light transmission without causing optical interference is maximum as described above is provided. By reading, it is possible to detect the density of the warp or weft. Further, it is possible to judge a defect caused by a twist or a flaw of the yarn based on the change of the state of the moire fringe. The strobe means 4 intermittently irradiates the cloth 2 with a flash of light, and intermittently and periodically generates a flash of light passing through the moire generating means 3. The irradiation direction of the cloth 2 by the strobe means 4 is preferably a direction substantially perpendicular to the direction of the slit in the moire generating means 3, that is, a direction substantially perpendicular to the direction of the yarn to be detected. As a result, the shadow of the thread is favorably formed by the flash light from the flash unit 4, and a good moire fringe can be formed. Further, when the cloth 2 is thin, the strobe means 4 may be arranged so as to irradiate it from the back side of the cloth 2. Instead of the lamp type shown in FIG. It is also possible to use. When using the above-mentioned circle, it is more effective to cover the portion of the circle in the direction of the yarn to be detected. In the strobe means 4 as described above, the control device 7
The flash frequency is adjusted accordingly.

For example, when the cloth 2 is irradiated with a flashing light having an appropriate frequency within the range of 1000 ppm to 5000 ppm, the moire fringes are generated by the flashing light when the cloth density of the running cloth 2 and the division density of the slits substantially match each other. Occurs and remains as an afterimage in the eyes of the operator. This state is 1000
An appropriate number of ppm to 5000 ppm continues intermittently to form an afterimage as a stationary moire fringe for the operator. Then, by this, the texture density and texture state can be visually detected. Therefore, normally, it is not necessary to strictly synchronize the frequency with the cloth density, and it is possible to set an appropriate value within the above range. However, 100
At 0 ppm or less, the image tends to be interrupted due to the increase in the moire fringe generation interval, and at 5000 ppm or more, it is equivalent to continuous irradiation of light due to the influence of the flash light other than the opportunity to generate moire fringes, and in each stationary state. It has been confirmed by an experiment that it is difficult to observe the moire fringes of. The drive means 5 uses the support mechanism (not shown) to drive the cloth 2
A gear 8 for rotatably driving the moire generating means 3 rotatably supported in a plane parallel to the gear 8 formed on the outer peripheral surface of a support member 8 supporting the moire generating means 3.
a and a spur gear 10 attached to the motor 9 mesh with each other. Then, the motor 9 is driven and controlled by a command signal from the control device 7 until the direction of the yarn to be detected matches the direction of the slit of the moire generating means 3. In this case, for simplification of the apparatus, the motor 9 and the spur gear 10 may be omitted and the moire generating means 3 may be manually rotated. The expansion means 6 is
It is mainly composed of a convex lens and is provided for the convenience of the operator when visually observing the moire fringes. The cloth detection device 1 according to the present embodiment is configured as described above.

Next, the procedure for using the cloth detection means 1 will be described. First, by controlling the drive of the motor 9, the direction of the yarn of the running cloth 2 to be detected and the direction of the slit of the moire generating means 3 are made to substantially coincide with each other. Operet
The tilt of the moire generating means depends on the drive amount of the motor.
Can be read. This inclination represents the inclination of the cloth
However, if this slope is large, it means that the quality is deteriorated. Subsequently, the flash light frequency in the flash unit 4 is set to an appropriate value between 1000 ppm and 5000 ppm by using the control device 7. Then, the operator visually observes the moire generating means 3 through the enlarging means 6 to observe the moire fringes in a stationary state (FIG. 2).
(A)). Then, in this state, the value of the scale corresponding to the position of the center point of the portion where the optical interference does not occur in a relatively wide range, that is, the area in which the slit density and the thread density are almost the same and represented in white is The thread density in the cloth 2 can be known by reading.
Further, from the state of the moire fringes, it is possible to determine a defect caused by twisting or scratching of the yarn based on the empirical judgment of the operator, and it is possible to take appropriate measures promptly and appropriately according to the defect state. . Therefore, the quality control system for cloth can be greatly improved with a very simple structure. The strobe means 4 in the above embodiment
Alternatively, a normal light source may be installed, and a disc having slits may be provided between the discs, and the disc may be rotated to intermittently shield the light source to generate flash light.

[0009]

Since the cloth-texturing method and device according to the present invention are configured as described above , the inclination of the moire fringes , that is, the cloth-texture , which changes depending on the state of the yarns that make up the running cloth, has a relatively simple structure. The operator can easily visually recognize the inclination of the stationary state. As a result, the operator can easily check the texture density and texture condition of the running cloth.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a cloth detection device according to an embodiment of the present invention.

FIG. 2 is a plan view of a moire generating unit that constitutes the cloth detection device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cloth detection device 2 ... Cloth 3 ... Moire generating means 4 ... Strobe means 5 ... Drive means 6 ... Enlarging means 7 ... Control device 8 ... Support member 8a ... Gear 9 ... Motor 10 ... Spur gear

Claims (1)

(57) [Claims] 1. A moire generating means, which is provided in the vicinity of a running cloth and is provided with a slit whose division density gradually changes, and 1000 PPM to 5000 PPM for the running cloth.
Strobe means for irradiating intermittent flash light and generating flash light rays passing through the moire generating means and the moire generating means are assigned to the warp or weft of the running cloth.
A cloth detection device comprising: a driving unit that tilts in a desired direction .