JPH08109549A - Device for detecting abnormality of warp in weaving machine - Google Patents

Abstract

PURPOSE: To detect abnormality of warp in excellent accuracy and to facilitate repairing operation of end breakage of warp. CONSTITUTION: A warp tension detecting sensor 4 is sandwiched between a guide roller 5 and a back roller 6 between a warp beam 1 and a heddle frame 2, brought into contact with warp 3 and arranged in a forced state by pressing with the warp 3. The strain output signal of the tension detecting sensor 4 is converted into a tension signal by a tension detector 7. When the revolution angle of a main shaft 8 is detected by a shaft encoder 9 and the revolution angle reaches a tension detecting timing, namely, the revolution angle range fat fixed width of approximately the maximum tension value generated in the maximum opening, the encoder outputs the existence of the main shaft in the revolution angle range to a judging device 10. The judging device 10 reads the warp tension value at that time and compares the tension value with a standard value which is preset, has a value not generated in ordinary warp route length and at which the warp is not cut. A stopper 11 suspends a weaving machine when the tension value is larger than the standard value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a warp abnormality detecting device for detecting abnormal tension or cutting of a warp of a loom.

[0002]

2. Description of the Related Art One of many warp yarns in a loom
It is necessary to stop the loom as soon as a book is cut to prevent generation of defective products, repair warp breaks, and restart the operation of the loom. Therefore, conventionally, there has been proposed a device that detects a warp break and automatically stops the operation of the loom. Also, after detecting the warp break and automatically stopping the operation of the loom,
An automatic repair device for automatically repairing a warp break has also been proposed. An example of such a conventional warp yarn abnormality detecting device is disclosed in Japanese Patent Laid-Open No. 62-15360. That is, a warp guide member with an engagement groove that sequentially travels each warp fed from the beam to a fixed position, an optical sensor having a receiving portion corresponding to each engagement groove, and the warp guide member are provided. When the warp is not cut, it consists of a light incident port to the light receiving part which is closed by the warp, and when one of the warp is cut, the closed light incident port is opened and the light receiving part of the optical sensor. The warp breakage is detected by the incidence of light on.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
Since the one that detects the disconnection of one book merely detects the disconnection, the subsequent repair work must be performed manually, and it takes a lot of repair time, resulting in low productivity. There is. In addition, even if the warp is cut, the sensor may not operate and may continue to operate.In that case, the cut warp end may be entangled with other warp yarns, and therefore it must be repaired at the time of restoration. There is a problem that it takes a much longer repair time. Further, since the automatic repairing device needs a device for detecting the cut warp and for taking out the warp and connecting the yarns, the current technology becomes extremely expensive and not realistic. .

The present invention has been made in view of such conventional problems, and a loom that can be easily repaired by detecting an abnormality of a warp before cutting and stopping the loom. An object of the present invention is to provide a warp yarn abnormality detecting device.

[0005]

A sensor for detecting the tension of a weft thread installed between a heald frame and a warp beam, a tension detecting device for converting the output of the sensor into a tension signal, and the tension detecting device. Discriminating means for generating an abnormal signal when the tension signal exceeds the reference value, and a loom stopping means for stopping the loom upon receiving the signal from the discriminating means. And.

[0006]

[Operation] The tension of the warp is measured during operation of the loom, and when the warp tension exceeds a predetermined reference value, it is judged that the possibility of cutting is extremely high and the loom is stopped before the warp is cut, Repair the warp. Thus, the warp breakage can be reliably detected without requiring a complicated device, and the repair is performed before the cutting, so that the repair can be easily performed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the configuration of an embodiment of the present invention. In order to detect the tension of the warp 3 between the warp beam 1 and the heald frame 2, the warp tension detection sensor 4 is provided with a guide roller 5
And the back roller 6 are installed. The strain signal of the warp tension detection sensor 4 is input to the tension detection device 7 and converted into a tension signal. Here, the warp tension detecting sensor 4 and the tension detecting device 7 constitute a warp tension detecting means.

Further, the shaft encoder 9 detects the rotation angle of the main shaft 8 and the rotation angle is around the warp tension detection timing (timing), that is, the detected tension is around the maximum warp tension value which can be used for detecting abnormality of the warp. It is checked whether it is within the range of the spindle rotation angle of a predetermined width, and when it is within the range, it is output to the determination device 10 that it is the warp tension detection timing. The determination device 10 reads the warp tension value at that time by a command from the shaft encoder 9, compares it with a predetermined reference value of the warp tension, and outputs an abnormal signal when the warp tension is larger than the reference value. . This reference value is set to a value that cannot occur when the warp yarn is normal and does not cut. Further, a stop device 11 for stopping the loom upon receiving an abnormal signal from the discrimination circuit 10 is provided.

FIG. 2 shows an example of how the warp tension detecting sensor is used. Since there are thousands of warp threads, the comparison between the tension of these warp threads and the reference value was carried out sequentially for all warp threads at one warp tension detection time. It is impossible to make a comparison at (1) because the processing time becomes long. In addition, when all warps are compared at the same time, a large number of comparison circuits must be provided, which causes a problem of high cost. Therefore, in this embodiment, the warp yarns 3 are divided into sets according to the number of warp yarns in which the tension signal and the reference value can be compared within the angular range of the detection timing, and a predetermined number of sets are provided. That is, as shown in FIG. 2, the warp tension detection sensors 4, the tension detection devices 7, and the determination devices 8 corresponding to the number of warps 3 that can be measured within the main shaft angle range of the warp tension detection timing. Form one group. This set is provided in the required number depending on the number of warp yarns. The output of the discriminating device 10 of each set is input to the stopping device 11.

FIG. 3 is a perspective view of the tension sensor 4 (showing the inside by cutting), and FIG. 4 is an enlarged cross-sectional view of the main part of the tension sensor 4. The tension sensor 4 has a structure in which a warp guide member 22 having a strain measuring body 21 housed therein is held by a mounting case 23. The warp guide member 22 is a long member, and a large number of guide grooves 24 for guiding the warp are continuously arranged on the upper surface thereof. A through hole 25 is vertically formed below each guide groove 24 so as to penetrate therethrough. Through hole 2
The upper part of 5 is narrowed and formed in a convex shape having a shoulder portion 25a, the upper end of the through hole 25 communicates with the guide groove 24, and the lower end of the through hole 25 is open.

The strain measuring body 21 housed in the through hole 25 is
A convex contact piece 26 whose upper surface comes into contact with the warp threads 3 guided in the guide groove 24 during operation of the loom, supports the convex contact piece 26, and has a U-shaped leaf spring 28 having a strain gauge 27 mounted thereon. The contact piece 26 and the support plate 29 that supports the U-shaped plate spring 28 are included. Convex contact piece 26
Moves up and down in balance with the elastic force of the leaf spring 28 in accordance with the magnitude of the tension of the warp yarn 3 to change the bending state of the U-shaped leaf spring 28. The strain gauge 27 emits a strain signal according to the deflection of the leaf spring 28. The convex contact piece 26
Indicates the upward movement range of the locking piece 2 of the convex contact piece 26.
6a is regulated until it comes into contact with the shoulder portion 25a of the through hole 25.

The warp guide member 22 and the support plate 29 are integrally assembled by engaging with a groove 30 formed in the mounting case 23, and the conductor wire 31 of the strain gauge 27 is supported by the support plate 2.
It is led to the outside through a hole 32 formed in the through hole 9 and a space 33 formed in a part of the groove 30 of the mounting housing 3 below the supporting plate 29.

In the embodiment described above, the warp 3
The strain of the U-shaped leaf spring 28 is controlled by the strain gauge 27
However, the structure is not limited to this structure. For example, a piezoelectric element is installed below the convex contact piece 26 to detect the pressure due to the tension applied to the convex contact piece 26. It is sufficient if the tension can be detected.

Next, the operation will be described. First, a device for feeding and winding the warp 3 will be described. As shown in FIG. 1, the warp yarns 3 sent from the warp beam 1 are guided to the heald frame 2 via a guide roller 5 and a back roller 6. At this time, the warp tension sensor 4 measures the tension of the warp 3 between the guide roller 5 and the back roller 6. The wefted weft yarns are beaten by the reeds 12 onto the cloth fell 13 to weave a woven fabric 18, pass through the breast beams 14, and reach the surface roller 15 and the press roller 16. The surface roller 15 is interlocked with the loom main shaft 8 and rotates at a predetermined speed to pull the woven fabric 18. The woven fabric 18 is then wound around the cross roller 17.

FIG. 5 shows the relationship between a general spindle rotation angle and warp tension. The tension of the warp increases rapidly and becomes the largest when the opening is rapid as shown in the cycle A part, and then gradually decreases and becomes the smallest when the opening is closed.

In the case of a filament yarn such as a nylon yarn in which several tens of filaments are combined to form one thread, if one of the constituent filaments is cut, the cut filament is cut off. May be released from the filament yarn and may be rebounded by the warp yarn that opens and closes to make a complicated motion, and may be entangled with the adjacent yarn and form a pill-shaped mass 35 as shown in FIG. 7. Then, the path length of the warp yarns increases, and the tension of the warp yarns 3 becomes abnormally large (abnormal value) when the warp yarns are opened up to the maximum opening amount as indicated by the alternate long and short dash line in cycle B of FIG. At that time, if weaving is continued, the tension of the warp yarns becomes larger and exceeds the cutting strength, so that the yarn is cut.

This embodiment utilizes this property to make the reference value of the tension of the warp 3 a value that cannot be generated under normal conditions and the warp does not cut, for example, the path length of the warp 3 is a normal length. In this case, the value is preset to a value that cannot occur, and the loom is stopped when the measured tension becomes an abnormal value exceeding the reference value as shown in cycle B of FIG. As a result, the loom is stopped in advance before the warp is actually cut, so that the warp is not cut. As a result, the work of repairing the warp breakage becomes easy, and the repair can be automated with a relatively simple structure.

The control operation of this embodiment will be described with reference to the flowchart of FIG. First, in step 41, the shaft encoder 9 checks whether or not the rotation angle of the main shaft 8 is the timing for detecting the warp tension. As described above, the measurement value of the warp tension is effective for predicting the warp cutting at the detection timing between the front and rear spindle phase angles when the warp is rapidly opened to the maximum. Therefore, if it is the detection timing, the shaft encoder 9 outputs it to the discriminating device 10 and proceeds to step 42. If it is not the detection timing, it returns to the original state. In step 42, the determination device 10 reads the warp tension value at that time from the tension detection device 7, and proceeds to step 43.

In step 43, it is checked whether or not the warp tension value exceeds the reference value. If the warp tension value does not exceed the reference value, the process proceeds to step 44, and if it exceeds the reference value and proceeds to step 45. In step 44, it is determined that the warp has no trouble, and the procedure from step 41 to step 43 described above is repeated for the next warp.
In step 45, the stopping device 11 determines that the possibility of cutting the warp yarns is high and stops the loom.

8 to 9 show examples of usage of the warp tension detection sensor when the number of warp yarns 3 is large and the warp yarn density is high. Since there are an extremely large number of warp yarns 3, two warp yarn tension detecting sensors 4 are installed in parallel, and as shown in FIG.
Are alternately arranged, that is, the peaks and valleys are shifted, and the two warp tension detection sensors 4 arrange the peaks and valleys in reverse. Then, the warp yarns 3 are alternately delivered to the respective warp yarn tension detecting sensors 4 to measure the tension (in FIG. 9, the warp yarn tension detecting sensors 4 are vertically shifted for convenience of explanation).

[0021]

As described above, according to the present invention, the warp yarn abnormality can be accurately detected without using a complicated and expensive device. In addition, since it is possible to accurately detect a state in which there is a high possibility of cutting the warp, it is possible to easily repair the warp without cutting the warp and improve the productivity.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of a usage mode of the warp yarn abnormality detection device according to the embodiment.

FIG. 3 is a perspective view showing a warp tension detection sensor according to an embodiment.

FIG. 4 is an enlarged cross-sectional view showing a main part of a warp tension detecting sensor according to an embodiment.

FIG. 5 is a diagram illustrating a relationship between a spindle rotation angle and a warp tension.

FIG. 6 is a flowchart showing the control operation of the embodiment.

FIG. 7 is a diagram illustrating a change in warp path length.

FIG. 8 is a view showing a state where two warp tension detection sensors are used in parallel.

FIG. 9 is a diagram for explaining the relationship between peaks and valleys when two warp tension detection sensors are used in a row.

[Explanation of symbols]

 1 Warp Beam 2 Held Frame 3 Warp 4 Warp Tension Detecting Sensor 7 Tension Detecting Device 8 Main Spindle 9 Shaft Encoder 10 Discriminating Device 11 Stopping Device 12 Reed 13 Woven Fabric 21 Strain Measuring Body 22 Warp Guide Member 23 Mounting Case 24 Guide Groove 25 Through Hole 25a Through-hole shoulder portion 26 Convex contact piece 26a Convex contact piece locking portion 27 Strain gauge 28 U-shaped leaf spring 29 Support plate 30 Groove 35 Ball-shaped mass

Claims (3)

[Claims] 1. A sensor installed between a heald frame and a warp beam for detecting the tension of a warp, a tension detecting device for converting the output of the sensor into a tension signal, and a tension signal from the tension detecting device. And a loom stopping means for comparing the preset reference value with each other and generating an abnormal signal when the tension signal exceeds the reference value, and a loom stopping means for receiving the signal from the judging means and stopping the loom. A warp yarn abnormality detection device for a loom. 2. A warp guide member having a guide groove for guiding each warp thread fed from a warp beam to a fixed position, and a sensor for detecting the tension of the warp thread, and a sensor provided for each guide groove in the warp thread guide member. 2. The warp yarn abnormality detecting device for a loom according to claim 1, wherein the warp yarn abnormality detecting device comprises a warp yarn guide member and a mounting housing that holds the warp yarn guide member and the strain gauge member. 3. The strain measuring body comprises a convex contact piece with which each warp thread comes into contact, a U-shaped leaf spring that supports the convex contact piece, and an elastic strain such as a strain gauge attached to the leaf spring. The warp yarn abnormality detecting device for a loom according to claim 2, further comprising: a detecting unit.