JPH042874A - Sensor for pulled yarn - Google Patents

Abstract

PURPOSE:To accurately and quantitatively sense pulled yarn by bringing a tension sensor into contact with a fabric, simultaneously arranging a flat plate on the opposite side through the aforementioned fabric, sensing variation in tension in the running direction of the fabric and discriminating the pulled yarn present in the fabric from modulation at the signal level thereof. CONSTITUTION:A cloth 5 is brought into contact with a linear gauge sensor 1 in the central part between two feed rollers 4 for running the cloth 5 and a flat plate 6 is simultaneously provided and constructed on the side opposite to the above-mentioned cloth 5 to enable sensing of variation in thickness of the cloth 5. The variation in tension based on variation in thickness caused by pulled yarn present in the aforementioned cloth 5 is sensed to afford an output signal, which is then inputted to a signal processing circuit 2 and processed to display a modulation state at the signal level thereof on a display device 3.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hanging line detection device. More specifically, "hanging thread" is a type of defect inherent in textiles.
The present invention relates to a device for detecting.

(Prior Art) A "hanging thread" is a type of defect inherent in textiles. In other words, in a textile structure formed by warp and weft threads crossing each other, threads with abnormally high tension may be mixed into some of the warp threads or weft threads, and these are called "hanging threads".
This is called a defect and is treated as a defect.

Traditionally, inspection of defects inherent in textiles has relied solely on the visual or tactile sense of an expert. In recent years, in order to automatically detect defects in these textiles using machines,
Several proposals have been made. However, detection of the "hanging thread" still relies heavily on the visual sense and tactile sense of an expert, and no method or device for automatically detecting this has been proposed. Even in its normal state, textiles have extremely complex structures.

Even for experienced canes, the information obtained from vision, especially when it comes to detecting ``hanging threads,'' is supplemented by information obtained from the tactile sensation of directly touching the fabric with the fingers.

(Problems to be Solved by the Invention) These inspections using human vision and tactile sense require skill on the part of the person performing the inspection, and are not always sufficient in terms of efficiency and accuracy. These problems are fatal when inspecting fabrics produced in large quantities using multiple looms. That is, as mentioned above, even in its normal portion, a woven fabric has an extremely complicated structure, and there is no small variation in the tension of the warp and weft yarns. Detection of hanging threads is the process of extracting particularly large deviations from this variation, and a certain standard should originally be set for this. However, even with the eyes and hands of an expert, it is virtually impossible to constantly inspect many fabrics with a constant standard.

In recent years, it has become possible to stabilize the quality of industrial products at a high level through QC, that is, thorough quality control.In recent years, it has become possible to stabilize the quality of industrial products at a high level through thorough quality control. It is amazing how much quality control has been carried out.

In view of this situation, the present inventors have conducted extensive research, and as a result,
The following invention has been achieved regarding a method and device for detecting hanging threads with good reproducibility and with a certain standard.

(Means for Solving the Problems) That is, the present invention provides a transport unit that runs a fabric in a belt shape, a sensor that senses tension fluctuations in the running direction of the fabric by contacting the fabric, and a sensor that moves the fabric through the fabric. This is a hanging thread detection device provided with a fabric support plate on the opposite side.

In the present invention, for example, a load cell, a magnetic sensor, an optical sensor, etc. can be used to measure the displacement of a movable object.

It is difficult to easily specify the load for pressing a movable object against a fabric, as it depends on the characteristics of each fabric, the degree of hanging thread to be detected, etc., but it is approximately 1g to 1k.
g weight, preferably in the range of 5 g weight to 100 g weight.

The shape of the part of the movable object that comes into direct contact with the fabric is also difficult to specify because it depends on the characteristics of each individual fabric, the extent of the hanging thread to be detected, etc., but it is difficult to specify the shape of the part of the movable object that directly contacts the fabric, but it is difficult to specify the shape of the part of the movable object that directly contacts the fabric. For this purpose, a hemispherical shape is preferable as much as possible.

Furthermore, in the present invention, the detection rate of "hanging thread" can be improved by adding a mechanism to the hanging thread detection section to apply tension in the transport direction of the fabric and in a direction perpendicular to the transport direction, as necessary. is also possible.

EXAMPLES The present invention will be explained in more detail by way of Examples below, but the present invention is not limited thereto.

(Example) Example 1 FIG. 1 is a schematic explanatory diagram showing the detection part of the "hanging line detection device" in the present invention. As shown in the figure, two feed rollers are installed as part of the roller system that continuously conveys the fabric to be inspected, and a linear gauge sensor is pressed against the fabric at the center of the two rollers. A metal flat plate is installed on the back side to detect changes in the thickness of the fabric due to the "hanging thread".

That is, in this case, the detection end of the linear gauge sensor corresponds to the "movable object provided in contact with the textile" in the present invention, and the linear gauge sensor body corresponds to "the displacement of the movable object in the direction perpendicular to the textile". sensor that detects
This corresponds to

The roller width is 190cm, and the feeding speed of the fabric is 0 to 75m by controlling the drive motor of the conveyance system with an inverter.
It was made variable over a period of 7 minutes.

The signal obtained from the linear gauge sensor is converted from the conveying speed into the moving distance of the detection end of the linear gauge sensor on the fabric and displayed on the display.

FIG. 3 is an example of a signal obtained from a normal part without a hanging line. The low frequency components seen in the figure are noise components caused by eccentricity of the rollers, natural vibrations of the mechanical system, etc.

FIG. 4 is an example of a signal obtained when the detection end of the load cell passes through a certain part of the hanging string. As shown in the figure, it has been shown that the variation in the thickness of the fabric caused by the hanging thread can be detected as a ``displacement in the direction perpendicular to the fabric'' of the detection end of the linear gauge sensor.

Embodiment 2 FIG. 2 is a schematic explanatory diagram showing the detection portion of the "hanging line detection device" according to the present invention. As shown in the figure, a fixed roller is installed in a part of the roller system that continuously conveys the fabric to be inspected, and a load cell is installed in the perpendicular direction of the fixed roller to detect the effects caused by the "hanging thread" inherent in the fabric. This detects changes in the thickness of textiles.

The width of the roller is 100 cm, and the feed speed of one fabric is controlled from 0 to 1 by inverter control of the drive motor of the conveyance system.
It was made variable over a period of 75 m and 7 minutes. The load with which the load cell was pressed against the fabric was 20 g.

In addition, four load cells are installed in parallel at intervals of 20 cm, and each load cell is placed in a direction perpendicular to the transport direction of the fabric (
: Traverse at 60 m/min (in the lateral direction of the fabric) (effective traverse length of each load cell: 20 cm, effective detection width: 80 cm)
m).

In this device as well, it was possible to detect hanging threads in the same manner as in Example 1. It was also possible to detect hanging threads contained in the warp threads of the fabric by traversing the load cell.

(Effects) According to the present invention, compared to human visual and tactile inspections, it requires no skill and is superior in terms of efficiency and accuracy.
Furthermore, it has become possible to quantitatively determine the criteria for judgment.

[Brief explanation of drawings]

Figures 1 and 2 are schematic diagrams showing the detection part of the detection device of the present invention, Figure 3 is an example of a signal of a normal fabric without a hanging thread, and Figure 4 is an example of a signal when a hanging thread is detected. shows. 1: Linear gauge sensor 2: Signal processing circuit 3: Display 4: Feed roller 5: Fabric 6: Flat plate

Claims (1)

[Claims] (1) A suspension system comprising: a conveying unit that runs the fabric in a belt shape; a sensor that detects tension fluctuations in the running direction of the fabric by contacting the fabric; and a fabric support plate provided on the opposite side of the sensor across the fabric. Thread detection device.