JP2005248333A - Quality control method of fiber bundle in spinning machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a quality control method for a fiber bundle, with which quality data obtained by measuring a fiber bundle after spinning in a spinning machine are used and approximately the same effect as the judgement result obtained by a generally used standard inspection machine is obtained. <P>SOLUTION: In a quality measuring apparatus 1, an operation apparatus 11 successively stores measurement data and calculation data in a memory 13 on the basis of detection signals obtained by photoelectric yarn detectors 7 and 8 in a real time. The standard inspection machine examines the fiber qualities of a bobbin 3 in a full bobbin and the qualities of yarn of the bobbin 3 are judged. Quality item data such as yarn evenness, fluff, etc., in the period of spinning time of the bobbin 3 judged as good are set as standard values of the spinning machine and the qualities of the yarn in spinning operation are controlled by the standard values. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a quality control method for spinning fiber bundles such as yarn or sliver in a spinning machine.

Inspection of quality items represented by the quality of fiber bundles spun in a spinning machine, such as spots, fluff, and strength, is usually performed by using, for example, a part of yarn spun by a plurality of spindles of a ring spinning machine as a sample yarn. Extraction and pass through a reliable standard dedicated inspection machine installed in the spinning factory, and if the yarn quality is good, continue spinning operation of the ring spinning machine. The sample yarn must be inspected periodically to produce a good quality yarn, for example, every time one pipe yarn is spun. Therefore, the quality control of the spun yarn is very complicated and takes man-hours and time.
In addition, if the yarn quality inspection time interval is increased in order to reduce complexity, the risk of generating defective products increases, and the yarn spun during that time may flow to the subsequent process even if it is defective. Therefore, even if the work is complicated, periodic inspections have to be performed in a short cycle.

In order to solve the above problem, various quality control methods for spinning machines such as those disclosed in Patent Documents 1 to 3 have been proposed.

Patent Document 1 discloses that in a pneumatic spinning machine (bundling spinning machine), a slab catcher that detects yarn unevenness of a yarn fed from a delivery roller is disposed in a yarn path, a detection signal from the slab catcher is calculated, and the thickness of the yarn is calculated. Is obtained, and this is compared with a set value to monitor the yarn unevenness.

Patent Document 2 discloses that in a binding spinning machine, a capacitance type sensor is disposed in a path of a yarn drawn by a draw-off roller and a top roller, and a yarn spot obtained by calculating a signal from the sensor is obtained in advance. Compared with the set reference value, the quality of the yarn unevenness is judged. In this case, it is described that the reference value is not set to a value that does not pass the product when the reference value is exceeded, but is set to a value that causes a defective product as a product when left as it is.

Patent Document 3 discloses a tension false twisting machine in which a tension sensor is disposed in a traveling path of a spun yarn, and a tension signal obtained from the tension sensor is detected by an upper and lower detection standard (upper limit) with respect to a preset target value. Value and lower limit value) to determine whether the product is defective.
JP 61-132644 A JP 62-57953 A JP-A-6-322621

In all of the known techniques disclosed in Patent Documents 1 to 3, a yarn detection device is provided in a spinning machine, and the quality of the yarn is monitored and managed by data obtained from the detection signal.
However, no consideration is given to the reference value for determining the quality of the measured data in any known technique. That is, the reference value provided in the yarn detection device of the spinning machine is generally set to a value obtained empirically or experimentally. Further, the yarn detection device also varies, and the yarn detection device provided on one spindle of the spinning machine is different from the standard inspection machine described above in the measurement location and the sensitivity of the detector, and is provided in the standard inspection machine. It is difficult to obtain detection accuracy.

For this reason, the yarn quality data measured by the yarn detection device provided in the spinning machine cannot be expected to be the same as the data obtained from the standard inspection machine, and there is a problem that reliability is lacking. Actually, for example, in a ring spinning machine or the like, there is no adoption of a yarn detection device for yarn quality control. Usually, as described above, it is a fact that complicated quality control is required to take a sample yarn and apply it to a standard inspection machine.

In view of the above problems, the present invention can obtain almost the same effect as the determination result obtained by the standard inspection machine using quality data obtained by measuring the traveling fiber bundle after spinning in the spinning machine. A quality control method for fiber bundles is provided.

The invention according to claim 1 is characterized in that a fiber bundle quality measurement processing device is installed in the spinning machine to detect a spun fiber bundle and store data relating to the quality of the fiber bundle obtained from the detection signal. The bundle is subjected to quality inspection using a standard inspection machine, and when the fiber bundle inspected by the standard inspection machine is determined to be non-defective, data relating to the spinning quality of the fiber bundle is spun by the spinning machine. It is set in the quality measurement processing apparatus as a reference value for judging the quality of the fiber bundle to be determined, and the quality of the spun fiber bundle is judged based on the reference value during operation.
According to the invention of claim 1, since the relative relationship between the quality-related data of the spinning machine quality measurement processing device and the inspection result of the standard inspection machine is used, the measurement result of the quality measurement processing device is It can be estimated that the result is almost the same as the inspection result of the standard inspection machine, and even the quality measurement processing device provided in the spinning machine can perform highly reliable quality control. As a result, since it is not necessary to perform a regular inspection with a standard inspection machine, the number of inspection processes can be greatly reduced. In addition, the probability of missing a yarn defect can be greatly reduced.

In the invention according to claim 2, since the control limit value of the spinning machine is set at a statistical value or a predetermined ratio regarding the quality of the fiber bundle with respect to the reference value, a highly reliable control limit value is set. It can be set and does not hinder the quality control of the fiber bundle having an allowable range.

The invention according to claim 3 includes a control means provided with a communication means in a quality measurement processing apparatus for a spinning machine, the standard inspection machine is installed in an inspection room and has a control means provided with a communication means, The inspection result of the fiber bundle by the standard inspection machine is transmitted from the control means of the standard inspection machine to the control means of the spinning machine by communication, and the spinning machine control means measures the quality based on the inspection result signal of the fiber bundle determined to be non-defective A reference value or a reference value and a control limit value are set in the processing apparatus.
In the invention of claim 3, for example, when a spinning machine is installed in a separate factory, or in the same factory, the spinning machine installation position and the testing room are located at a large distance. The inspection result of the standard inspection machine is immediately transmitted to the target spinning machine by communication, and based on the signal, the reference value and the control limit value can be set in the spinning machine quality measurement processing device. Preparation man-hours for quality control can be greatly reduced.

According to a fourth aspect of the present invention, the quality measurement of the fiber bundle by the quality measurement processing device is a measurement obtained by detecting the fiber bundle traveling toward the bobbin of the winding unit with a detector and obtaining from the detection signal of the detector. It is characterized in that it is performed based on the quality item data of the fiber bundle calculated based on the data and the measurement data.
According to the fourth aspect of the present invention, it is not necessary to use an expensive and highly accurate measuring instrument such as a standard inspection machine in the previous period, and it can be sufficiently implemented with a simple and inexpensive configuration that can be installed in a spinning machine.

The invention according to claim 5 is characterized in that the quality item of the fiber bundle includes at least fiber bundle spots.
In invention of Claim 5, reliable management can be performed about the most important spot on the quality control of a fiber bundle.

As described above, the present invention is almost the same as the case of using a standard inspection machine that is generally trusted only by using a simple device such as a quality measurement processing device that directly detects a fiber bundle being spun provided in a spinning machine. Equivalent fiber bundle quality control can be performed, and reliable quality control can be performed.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIG.
The figure schematically shows a part of a known ring spinning machine. The ring rail 2 moves up and down with respect to a bobbin 3a that is connected to a driving source (not shown) and rotates to form a tube thread 3. The yarn 4 forming the tube yarn 3 is fed out from a draft portion (not shown), and after passing through the snell wire 5, is wound around the bobbin 3a through the traveler 6 while forming ballooning.

Next, the yarn quality measurement processing apparatus 1 will be described.
In the traveling path of the yarn 4 leading to the snell wire 5, a photoelectric yarn detector composed of a light projector 7 and a light receiver 8 is disposed across the yarn 4. The light receiver 8 is connected to the arithmetic unit 11 via the amplifier 9 and the A / D converter 10. The arithmetic unit 11 is a read-only memory 12 storing a known program for calculating data representing quality items such as yarn spots and yarn fluff based on the light reception signal of the light receiver 8 and the measurement data by the light receiver 8 and after the calculation. This is connected to a writable memory 13 for storing the yarn quality item data and reference values and control limit values described later. The arithmetic device 11 is further connected to a display 14 for displaying the various data and an input device 15 for inputting necessary data by an operator.

  Therefore, the light projected from the projector 7 is partially shielded by the thread 4, but the other light that is not shielded reaches the light receiver 8. Change. The light reception signal of the light receiver 8 is amplified by the amplifier 9, converted into a digital signal by the OLE_LINK 2 and further A / D converter 10 OLE_LINK 2, and then sent to the arithmetic unit 11.

The arithmetic unit 11 stores the digital signal in the memory 13 as measurement data representing the state of the yarn 4 in real time as it is or after processing the digital signal. In addition, the arithmetic unit 11 calculates quality item data representing the state of occurrence of yarn unevenness and fluff based on the measurement data by the arithmetic program read from the memory 12 and stores the quality item data in the memory 13. In this example, the yarn unevenness data is represented by U% indicating the variation in thickness, and the data on the fluff is represented by the number of fibers protruding from the yarn per unit length.

  The display unit 14 can display the measurement data in real time, and can read out and display the calculated yarn spot and fluff data. Further, the input device 15 can input reference values and control limit values for comparing and evaluating measurement data and quality item data, and other necessary data.

Next, a quality control method of the spun yarn in the ring spinning machine configured as described above will be described with reference to FIG.
First, when the bobbin 3a is set on a spindle (not shown) by a known method and the spinning operation of the ring spinning machine is started, the yarn 4 drafted in the draft section is sent out from the draft section, and the snell wire 5 is It is wound around the bobbin 3 a while forming ballooning with the street traveler 6. Also, the operator adjusts the operation of the ring spinning machine so as to obtain a certain level of yarn quality.

During this spinning operation, the photoelectric yarn detector is operated, and the light projected from the projector 7 is received by the light receiver 8 while being partially blocked by the traveling yarn 4. This received light signal is amplified by the amplifier 9, converted into a digital signal by the A / D converter 10, and sent to the arithmetic unit 11 as described above. The arithmetic unit 11 sequentially stores measurement data and yarn quality item data in the memory 13 every predetermined spinning period based on the yarn detection signal sent in real time.
When the spinning operation is further continued and the tube yarn 3 reaches the full winding state, the ring spinning machine is stopped and the tube yarn 3 is replaced.

The operator takes out a plurality of pipe yarns 3 as samples, and carries them to the inspection room with a standard inspection machine (not shown) to receive a yarn quality inspection of the sample pipe yarns 3. . In the inspection room, the inspector performs a yarn quality inspection of the tube yarn 3 by a standard inspection machine using a conventional method, and obtains various inspection data relating to yarn spots and fluff. This inspection data is printed and used as necessary. Further, the inspector determines the quality of the sample tube yarn 3 based on the inspection data.

If the yarn quality of the sample tube yarn 3 is determined to be good as a result of the above inspection, the operator brings back this determination result, and the yarn quality during the subsequent spinning operation of the ring spinning machine that spun the sample tube yarn 3 is returned. Perform management operations.
That is, the measurement data and quality item data in the spinning time zone of the yarn determined to be good by the standard inspection machine differ in the structure and accuracy of both devices when compared with the inspection data obtained by the standard inspection machine. Therefore, although the absolute values are different, since the results are the results of measuring the same yarn, the meanings of the data obtained by both apparatuses can be considered to be substantially the same.

Therefore, the operator sends the measurement data of the spinning time zone of the yarn subjected to the inspection of the sample tube yarn 3 and the quality item data such as yarn spots and fluff calculated based on the measurement data from the memory 13 via the input device 15. Read out and store it in the memory 13 as a reference value.
In addition, the operator inputs a control value relative to the reference value to the input device 15 based on a statistical value related to variation in data of the yarn quality item or a predetermined ratio, and stores it in the memory 13. .

After setting the reference value and the control limit value, the operator starts spinning operation of the ring spinning machine.
Thereafter, during spinning operation, the ring spinning machine continuously receives a signal from the light receiver 8 of the photoelectric yarn detector, and the arithmetic unit 11 performs measurement data based on this signal and yarn quality item data calculated from the measurement data. Is stored in the memory 13 and compared with the set reference value or control limit value to monitor the occurrence of spun yarn quality abnormality in real time.

If the yarn quality item data deviates from the control limit value during monitoring of the spun yarn, an abnormality signal is displayed on the display 14 or other display device to warn the operator that a quality abnormality has occurred. Also, the operator can take necessary measures for the target ring spinning machine upon receiving this warning.

In addition, the operator can operate the input device 15 to display the transition of the yarn quality item data in the pipe yarn 3 during the spinning operation on the display unit 14 and check the yarn state at an arbitrary time.
If the sample pipe yarn 3 is determined to be defective in the inspection by the standard inspection machine, the spinning operation of the ring spinning machine is adjusted again, and the pipe yarn obtained after the adjustment is adjusted as described above. Work to receive the inspection.

The first embodiment has the following effects in addition to the effects of the invention.
(1) Since the measurement data is real-time data obtained over a long period of time, standard variations in the target machine can be statistically calculated with high accuracy, and highly accurate control limit values can be easily calculated from the calculated values. Can be set.
(2) During the spinning operation of the ring spinning machine, the transition of measurement data and quality item data can be displayed on the display at any timing and confirmed, so the changes in data and future trends can be read immediately. You can know the possibility of a problem in advance.

(Second Embodiment)
Next, a second embodiment will be described based on FIG. The second embodiment is obtained by adding a partially different configuration to the first embodiment, and the same reference numerals are given to the same configurations as the first embodiment.
The arithmetic unit 11 of the quality measurement processing apparatus 1 installed in the ring spinning machine further includes a communication unit 16 and constitutes a control unit 17 together with the memory 12 and the memory 13.

On the other hand, the standard inspection machine 18 is installed in an inspection room 19 located away from the installation place of the ring spinning machine. The inspection data of the yarn applied to the inspection machine 18 is processed and stored in the control unit 20. The control unit 20 includes a communication unit 21 and constitutes a control unit 22. The communication means 21 is connected to the communication means 16 of the quality measurement processing apparatus 1 by a cable 23 and can communicate data held by the control means 17 and 22 with each other.

The sample tube yarn 3 formed in the ring spinning machine is transported to the inspection room 19 and is inspected by the inspection machine 18 as in the first embodiment. The inspection machine 18 processes and stores the yarn inspection data of the sample tube yarn 3 into predetermined data relating to the quality of the yarn, such as quality items, as known in the control unit 20. Further, it is determined whether or not the sample tube yarn 3 is a non-defective product based on the quality-related data, and the determination result and the quality-related data are stored in the control unit together with the identification symbol of the target ring spinning machine.

The control unit 20 transmits the determination result of the sample tube yarn 3 from the communication unit 21 to the communication unit 16 on the ring spinning machine side via the cable 23. The arithmetic unit 11 reads the quality item data of the yarn in the time zone in which the sample tube yarn 3 was spun from the memory 13 only when the received determination result signal is good, and spun the sample tube yarn. It is automatically set as the reference value for the ring spinning machine.
The management limit value can be automatically set at the time of setting the reference value by storing in the memory 13 a statistical value related to variation or fluff or a predetermined ratio in advance.

The second embodiment has the following effects in addition to the effects of the invention.
(1) Inspection results from the inspection machine are automatically communicated, and upon receiving this inspection result signal, the quality measurement processing device on the ring spinning machine side automatically sets the reference value and control limit value for yarn quality control. Therefore, the worker only needs to confirm the quality of the inspection result signal, and the burden on the worker can be greatly reduced.

The present invention is not limited to the first and second embodiments described above, and various modifications are possible within the scope of the gist of the invention. For example, the following modifications may be made.
In the first and second embodiments, the data collection regarding the quality of the yarn during the spinning operation may be individual weights or the average value of the weights.
In the first and second embodiments, the arithmetic device, the display, the input device, and the like may be shared with the ring spinning machine control device.
In the first and second embodiments, the method for determining whether or not the yarn quality in the quality measurement processing apparatus is abnormal is determined based on whether or not the reference value or the control limit value has been exceeded as in the embodiment. The determination is not limited to that, and the determination may be based on the magnitude of the differential value with respect to the time of the data.
○ In the first and second embodiments, the data related to the yarn quality measured by the quality measurement processing device is changed due to the change of the roving yarn set in the ring spinning machine or the wear of the traveler or other parts, Even when an abnormality is judged, the spun yarn spun at that time is inspected by the standard inspection machine, and if the result is judged to be good, it is stored in the quality measurement processing device at the time of spun yarn. Can be reset as a new reference value.
This method lowers the level of yarn quality control, but even at that level, the quality of the spun yarn passes the standard inspection machine, which is used on ring spinning machines of the same quality control level. This means that the range of possible thread types can be expanded.
○ The yarn detection device used in the quality measurement processing device may be a capacitance type detector capable of detecting yarn unevenness.
○ The length of the yarn applied to the standard inspection machine is not limited to the tube yarn unit as in the first and second embodiments, but may be a split ball unit.
The reference value regarding the yarn unevenness can be set by a histogram in addition to U% indicating variation, or can be set by combining these with the yarn count.
○ In addition to the number of fluff, the reference value for the fluff can be set by the length and number of fluff or the total length of the fluff, or can be set by these histograms.
○ Regarding the second embodiment, the inspection result from the standard inspection machine is transmitted to the quality measurement processing device of the ring spinning machine by communication, and the operator confirms the inspection result on the display of the quality measurement processing device and then the reference value It is also possible to implement by a modified method of manually inputting and setting the control limit value.
○ In addition to the ring spinning machine exemplified in the first and second embodiments, the present invention is applicable to each spinning machine such as a ring twisting machine, an open-end spinning machine, a binding spinning machine, a winder, a roving machine, and a drawing machine. Can also be implemented.

It is the schematic of the weight of a ring spinning machine and a quality measurement processing apparatus which shows 1st Embodiment. It is a flowchart which shows the quality control method in 1st Embodiment. It is the schematic of the weight of a ring spinning machine and a quality measurement processing apparatus which shows 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Quality measurement processing apparatus 7, 8 Photoelectric yarn detector 11 Arithmetic apparatus 14 Display 15 Input apparatus 16, 21 Communication means 17, 22 Control means 18 Standard inspection machine 19 Inspection room 20 Control part

Claims (5)

In a spinning machine equipped with a number of winding portions for winding a spun fiber bundle around a bobbin,
A fiber bundle quality measurement processing device is installed in the spinning machine to detect the spun fiber bundle and store data relating to the quality of the fiber bundle obtained from the detection signal,
Quality inspection of the fiber bundle using a standard inspection machine,
When the fiber bundle inspected by the standard inspection machine is determined to be a non-defective product, the data on the spinning quality of the fiber bundle is used as a reference value for judging the quality of the fiber bundle spun by the spinning machine. A quality control method for a fiber bundle in a spinning machine, which is set in a quality measurement processing apparatus and determines the quality of a spun fiber bundle based on the reference value during operation. The quality control of the fiber bundle in the spinning machine according to claim 1, wherein the control limit value of the spinning machine is set at a statistical value related to the quality of the fiber bundle or a predetermined ratio with respect to the reference value. Method. The spinning machine quality measurement processing apparatus includes a control means having a communication means, and the standard inspection machine is installed in an inspection room and has a control means having a communication means, and the fiber bundle is inspected by the standard inspection machine. The result is transmitted from the control unit of the standard inspection machine to the control unit of the spinning machine by communication, and the control unit of the spinning machine sends the reference value or the reference value to the quality measurement processing device based on the inspection result signal of the fiber bundle determined to be good. 3. A quality control method for a fiber bundle in a spinning machine according to claim 1, wherein a control limit value is set. The data relating to the quality of the fiber bundle by the quality measurement processing device is the same as the real-time measurement data and the measurement data obtained from the detection signal of the detector by detecting the fiber bundle traveling toward the bobbin of the winding unit by the detector. The quality control method of the fiber bundle in the spinning machine according to any one of claims 1 to 3, wherein the quality item data of the fiber bundle is calculated based on The quality control method of the fiber bundle in the spinning machine according to claim 4, wherein the quality item of the fiber bundle includes at least a fiber bundle spot.

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