JP2008539338A - Apparatus and method for reading and controlling warp yarns in a loom - Google Patents

Abstract

An object of the present invention is to make it possible to identify a defect that needs to be interrupted and a defect that requires different corrections such as sewing or downgrading of the fabric in a repeatable and reliable manner.
Means for Solving the Problem An apparatus and method for reading and controlling a warp of a loom, the use of equipment (14, 16) for reading and collecting images, and the obtained images. Comparing two or more pre-set samples, at least one of the results of the comparison includes determining defects in the work process and instantaneously stopping the operation of the loom against the determined defects.
[Selection] Figure 5a

Description

  An object of the present invention relates to an apparatus related to warp control when a fabric is manufactured by a loom.

  As is well known, fabrics are made up of one or more warp yarns with a suitable device called a heddle to create a path for warp yarns stretched by a beam and placed parallel to the loom and a shuttle carrying the weft yarns. It is obtained by weaving the weft that is lifted and intersects the warp.

  Weaving is interwoven according to a design called texture. This shows a weaving pattern and further corresponds to repeated lifting of the warp. The formation of the fabric on the loom is the order shown in the weaving pattern; the step of forming the gap by lifting the warp, the step of opening the lead, the step of inserting the weft, and finally closing the lead And a step of driving;

  Currently, there is a known control device called warp and weft stop, which stops the loom when an abnormality occurs due to yarn or weft breakage. Since the defect is made, the quality deteriorates.

Warp yarn control has also been carried out in the past, but this is because the drop wire is placed over the extended warp yarn, crossing the bar formed by two plates and reciprocating in the reverse direction, the yarn breaks When this occurs, the corresponding drop wire falls and is fixed between the teeth of the two plates, thereby informing the yarn defect.

  Recently, mechanical drop wires are being replaced by those that are electrically connected to send an electrical signal to stop the loom.

  More recently, instead of drop wires, laser sensors installed at right angles to the warp are used to determine the control line. The sensor crosses the control line as the thread falls, so it can follow the broken thread.

  However, this solution can only be applied in the case of a hard yarn that actually cuts the control line when the yarn falls.

Such known solutions present weaknesses when using yarns that are not particularly stiff, such as when the yarn falls a little later or not at all.

  A common occurrence is, for example, entangled with an adjacent thread, and the thread does not fall even if it is torn or cut. In such cases, neither the drop wire nor the sensor device is effective.

  As a result, there are several types of weaving fabric products in the type of defective product, and depending on the degree of the defect, they are repaired by stitching or classified as defective products and the final product itself is downgraded.

  Such defects include, for example, yarn defects such as the formation of two or more warp tangles, the formation of knots, the formation of vertical facing damage, thin areas of weft yarn, lead failure, etc. .

  The primary object of the present invention is to overcome the weaknesses of known warp control devices.

  A second object of the present invention is to enable identification of defects that require interrupting cycles and defects that require different corrections, such as sewing or downgrading fabrics, in a repeatable and reliable manner.

  Another object of the present invention is to provide a continuous or periodic report of differences in the quality of the fabric being made compared to the finished product.

  The technical problem and the above-mentioned objects are generally realized by a warp reading and control device and method having the technical characteristics set forth in the appended claims.

Furthermore, the characteristics and advantages of the present invention will become clearer on the basis of the following description of non-limiting embodiments and the accompanying drawings which are preferred, but not limited thereto. The figure
1, 1 a and 2 show a detailed view of a conventional warp-fastening device used as a means of stopping and a conventional warp-fastening device that stops the loom in the event of a warp failure;
FIG. 3 schematically shows a conventional laser device for examining warp yarn defects,
4a / 4b and 5a / 5b schematically show the reading and control device according to the present invention, respectively, when there is no defect in the warp and when there is a defect,
FIG. 6 shows an example of a pattern and weaving report for forming a fabric on a loom,
FIG. 7 shows in detail the yarn lifting and lowering regions in the preferred embodiment of the apparatus of the present invention.

1 and 2 schematically show a known technical solution. The drop wire 1 is disposed across the warp 2 lifted by the lodge 10 of the loom so that the next weft 15 driven by the lead 11 can pass through to form the fabric 12.

  Since the drop wire 1 is hung on the rod made of the double plate 3 and moved so as to reciprocate, the corresponding drop wire falls in the case of a thread defect 2 ', so the double plate Between the teeth 4 and thereby notify the thread breakage. FIG. 2 shows a drop wire 1 ′ that is usually delimited by an insulator 7 and has metal parts 5, 6 that are electrically connected in the event of yarn failure.

FIG. 3 shows the use of the laser sensor 8 positioned at right angles to the side of the warp to determine the control line 9 in the known art. The laser sensor is located upstream of the heddle 10 or between the heddle 10 and the lead 11 and can read the warp thread path across the control line 9 when falling.

  4 (a, b) and FIG. 5 (a, b) are apparatuses according to the present invention schematically shown.

The device has one or more television cameras 14 (or other image recognition devices) and, if used, can be placed on a loom lead 11 that is part or all of the working height.

  The television camera 14 is arranged to take a series of warp movements lifted by the loom 10 of the loom moved according to a predetermined weaving pattern (FIG. 6), and further to control the television image an electronic assist device 16, connected to a video board or processing device 17, for example, the latter comprising a PC or other data processing device.

  In another embodiment, data transfer from the TV camera 14 to the electronic support device 16 and from the electronic support device 16 to the processing device 17 is performed by a cable 18 or a wireless method (infrared, optical communication, radio frequency, or other medium). Furthermore, the TV camera 14, the video board 16, and the processing device 17 can be unified into the same device according to the application.

  A television camera 14 with a suitable visual device associated with lifting of at least all warp yarns is preferably warp yarns associated with the L1 region near the upstream of the lead 11 or the L2 region near the downstream of the lead 11, One or more images (19 in the drawing) controlled by the support device 16 are taken. The obtained image is sent to the processing device 17 and converted into a code 24, preferably in the form of a bar code, and a target warp cord corresponding to one or more preset sample codes and To be compared.

  Preferably, the warp yarns that differ in the sample code but correspond to the appropriate configuration are stored after being authenticated (eg in the form of a bar code) at the beginning of the fabric formation process. This is done at the beginning of the work after all lifts to the weaving pattern (4 in the case of the weaving pattern in FIG. 6) are selected and stored in the electronic support device 16, each creating a different code 24. To do.

  Furthermore, the reading of the warp during the yarn lifting process may be performed using a solid light flash (not shown) or the like, which occurs at the same time as the continuous lifting of the yarn and the image taking. .

  Advantageously, the device can also provide a dual indicator on the final reading and starting readings 20, 21 which are arranged at the end of the fabric, such as the upper bar 22 of the lead 11.

  Preferably, a millimeter scale can be applied to the upper bar 22 to facilitate the system to detect and directly identify defects in the formed roll.

  While the device is in operation, a complete analysis of the inner and outer warp ends and yarn patterns can be performed on all image codes by looking for locations that appear to be local differences. Image processing is based on a tolerance that can be set in advance for any defect type and allows the perceived defect to be deciphered, preferably during monitoring as the thread is lifted, and repeated in the reading area. As a result, the position of the defect is specified to find all the defects of the fabric being created.

  FIGS. 4a and 5b and FIGS. 5a and b each show a defect-free code in which the image obtained by the television camera 14 has determined the appropriate code 24, ie, a first example (FIG. 4a). Then, the read image is a second example (FIG. 5 a) in which the code 24 ′ is determined to be an error due to a defect defect of the warp 2 ′.

In the present invention, in response to the determination of the code 24 ', the processor 17 can be programmed to stop the loom, for example, by stopping the work cycle.

Advantageously, depending on, for example, the desired final quality of the fabric, whether the perceived defect size or type (defective, frayed, entangled, etc.) is allowed or not, it is not stopped and the work continues as it is. It is possible to set in advance to be aware of the presence and location of the defect that may need to be patched or downgraded.

  Sensing the difference to a pre-set sample can be done with any weaving pattern for each yarn lift or periodically for a predetermined number of lifts.

  It is also possible to provide a display (continuously or periodically) for reading from outside the image and / or issuing an alarm signal for one or more sensed defects.

  In a preferred embodiment, a central server is provided for controlling a plurality of writing devices associated with the fabric being manufactured.

  In this embodiment, if there is a difference compared to the sample, the device determines the coordinates of the fabric being created and the position in the millimeter bar 22 to be corrected by stitching and preset. Connected to a server that determines possible modifications based on tolerances and conditions.

  FIG. 7 shows a preferred solution of the device according to the invention. In the present embodiment, the bar 25 can be inserted in advance behind and parallel to the lead 11, and when the warp 2 is lifted, one support plane can be formed.

  In this way, it is possible to avoid weaknesses that can occur due to insufficient reading near the reading area. In this reading area, without the bar 25, the thread that is lifted high up will conceal all or part of the thread underneath, so it is determined that there is a superficial error and the server stops working. It will be decided.

  The above-mentioned weakness is caused by the fact that the TV camera 14 is at a certain distance from the upper thread and is located in the center with respect to the width.

  In this arrangement, the television camera 14 takes an image in a conical shape that spreads downward, and some of the lower thread widths are excluded because they differ in width from the upper thread.

  The bar 25 brings all the yarns to the same height as the reading area of the TV camera 14, thus overcoming the above-mentioned weaknesses.

  Therefore, as described above, the advantages of the present invention are, in particular, the suppression or reduction of the conventional warp stoppage in the loom, the simple and quick installation on the loom, and the continuous and real-time control of the fabric making process. There is no or few elements in direct contact with the warp (wire drops in conventional warp clamps) and a complete picture of the defects in the fabric produced can be formed.

  The present invention is therefore also subject to various modifications and improvements within the scope of the invention, and further, parts of the apparatus can be replaced with technically equivalent elements.

FIG. 1 is a detailed view of a conventional warp fixing device that stops a loom in the event of a defective warp and a conventional drop wire used as a stopping means. FIG. 1a is an enlarged view of a detailed view of a conventional warp-fastening device that stops the loom in the event of a defective warp and a conventional drop wire used as a stop means. FIG. 2 is a detailed view of a conventional warp fixing device that stops the loom in the event of a defective warp and a conventional drop wire used as a stop means. FIG. 3 is a diagram schematically showing a conventional laser device for examining warp yarn defects. FIG. 4A is a diagram schematically showing a case where there is no defect in the warp of the reading device and the control device according to the present invention. FIG. 4b is a diagram schematically showing a case where there is no defect in the warp of the reading device and the control device according to the present invention. FIG. 5a is a diagram schematically showing a case where there is a defect in the warp of the reading device and the control device according to the present invention. FIG. 5b is a diagram schematically showing a case where there is a defect in the warp yarns of the reading device and the control device according to the present invention. FIG. 6 is a diagram showing an example of a pattern and weaving report for forming a fabric in a loom. FIG. 7 shows in detail the lifting and lowering areas of the intention in a preferred embodiment of the device according to the invention.

Claims (26)

A device for reading and controlling the warp of a loom,
At least one read acquisition means (14, 16) for reading and acquiring images of a plurality of warp yarns (2, 2 ′) during a work cycle in the loom;
Means (17) for comparing the obtained image with one or more predetermined samples and determining at least one defect state for defects in the work cycle based on the comparison;
Means for instantaneously stopping operation in the loom in response to the discovery of a defect or to inform of a detected defect.   2. An apparatus according to claim 1, comprising means for processing the obtained image and means for converting the image into a code (24, 24 ') that can correspond to a sample code.   2. An apparatus according to claim 1, comprising means for synchronizing the images obtained in succession with the lifting of the warp in accordance with the work cycle.   Apparatus according to claims 1 to 3, comprising illumination means for illuminating the image area to be read and collected.   5. A device according to claim 4, wherein the illumination means comprises a solid light flash which is synchronized with the lifting of the warp.   The apparatus according to claims 1 to 5, wherein the reading and acquiring means for reading and acquiring the image (24) comprises one or more television cameras.   Apparatus according to claims 1 to 6, wherein the reading acquisition means comprises an electronic board (16) interfaced to a processing unit (17). Said means for comparing the obtained image with one or more current samples to determine at least one defect state in a work cycle;
It includes a processing unit (17) that can compare the obtained image with one or more sample codes and extract relevant defect information, and further detect the detected defects in the work cycle in the loom. 8. Apparatus according to claims 1 to 7 including means to be associated with one or more adjustments to be made.   9. A device according to claim 1, comprising elements (20, 21) defining the beginning and end of the reading range.   10. The apparatus according to claim 1, further comprising means for projecting the obtained image.   11. The apparatus according to claim 1, further comprising means for sounding an alarm when the defect is determined.   12. A device according to claim 1, comprising means for outputting in one or more reports the difference between the fabric being created (12) and a preset fabric sample to be created.   Device according to claims 1 to 12, wherein at least one of the samples consists of an image obtained with respect to an initial length of the fabric (12) being created on the loom.   A loom having at least one device according to claim 1. A method for reading and controlling warp yarns in a loom,
At least one step of reading and acquiring an image associated with the warp while lifting a plurality of warp (2, 2 ');
Comparing the obtained image with one or more preset samples;
Determining at least one defect state in the work cycle as a result of the comparison;
A method comprising a step of interrupting and correcting the operation of the loom based on the determined defect.   The method according to claim 15, wherein the obtained image is converted into a code (24, 24 ') and the converted code is compared with a sample code.   The method according to claim 15 or 16, wherein the code is a bar code.   18. A method according to any one of claims 15 to 17, wherein successive image acquisition is performed in synchronism with the warp lifting in the work cycle.   19. A method according to any one of claims 15 to 18 comprising the step of associating a sensed defect with one or more adjustments to be made in a work cycle.   20. A method according to any one of claims 15 to 19, wherein the difference between one or more preset samples and the fabric being created is output in one or more reports.   21. A method according to any of claims 15 to 20, wherein the at least one sample is obtained from an image of an initial length of a fabric being created on a loom.   21. A method according to any one of claims 15 to 20, wherein the reading is performed over a length defined by the area of warp (L1) between the heddle and the lead.   22. A method according to any one of claims 15 to 21, wherein the reading is taken over a length defined by a warp yarn area (L2) existing between the lead and the created fabric.   24. A computer program comprising steps incorporating the method of claims 15-23.   25. The program of claim 24, incorporating an electronic chart for associating detected defects with appropriate and beneficial adjustments.   An electronic or optical recording medium for storing the program according to claim 24 or 25.

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