JP2002138332A - Yarn breakage detector of multiple yarn twister - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a yarn breakage detector of a multiple yarn twister, which judges whether a yarn is broken or not on the basis of the changes of detection signals in response to loads received from the yarn and can thereby surely detect the breakage of the single yarn by a simple structure. SOLUTION: This yarn breakage detector 1 of the multiple yarn twister for ballooning and twisting a yarn Y by the rotation of a spindle 3, and simultaneously doubling plural yarns and winding up the doubled yarn, is characterized by having a detector 2 which is brought into contact with the traveling yarn Y to output detection signals in response to loads received from the yarn Y, and a single yarn breakage detection means 21 for judging the breakage of the yarn or not breaking on the basis of changes of the detection signals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting a yarn breakage in a multiple twisting machine which winds and twists a yarn forming a balloon around a yarn supply package.

[0002]

2. Description of the Related Art In a multiple twisting machine that winds a yarn forming a balloon around a yarn supply package while twisting the yarn,
There is a case where one of the plurality of yarns is broken (hereinafter, referred to as a single yarn break) and a case where all of the plurality of yarns are broken (hereinafter, referred to as a yarn break). When such a yarn break occurs, the downstream yarn end is wound up by the winding package, but the upstream yarn end may be entangled with a rotating portion of the feed roller shaft or the like. When the yarn is entangled with the rotating portion, the yarn continues to be fed into a lump, and in the worst case, it is necessary to stop the multiple twisting machine and remove the entangled yarn lump, which is troublesome. Therefore, conventionally,
It has been practiced to detect a single yarn break from a change in the amount of received light using a photoelectric sensor, or to detect a single yarn break from a decrease in the load current of a motor in the case of a single spindle drive type.

[0003]

However, when a single yarn breakage is detected from a change in the amount of received light using a photoelectric sensor, the structure becomes complicated and the cost increases.
The amount of received light may change due to the adhesion of impurities such as yarn stains and fly wool, resulting in erroneous detection. On the other hand, in the case of a single spindle drive type,
Not only when it is used as upper and lower two-stage yarn feeding (Sun cheese) but also as one-stage yarn feeding (hollow spindle), there are variations in load current depending on the type of use, and there is always variation. It was not possible to detect a single yarn break accurately.

[0004]

SUMMARY OF THE INVENTION The present invention has been improved and eliminated in view of the above-mentioned problems, and determines whether a single yarn break has occurred based on a change in a detection signal according to a load received from the yarn. An object of the present invention is to provide a yarn breakage detecting device of a multiple twisting machine that can reliably detect a single yarn breakage with a simple configuration by making a determination.

[0005] In order to solve the above-mentioned problems, the present invention adopts a means according to claim 1, wherein a plurality of yarns are combined and wound while the yarn is ballooned and twisted by rotation of a spindle. In a multiple twisting machine, a detector that contacts a running yarn and outputs a detection signal according to a load received from the yarn,
A yarn breakage detecting device for a multi-twisting machine, comprising: a single yarn breakage determining means for determining whether or not a single yarn breakage occurs based on a change in the detection signal. In the present invention, whether or not a single yarn is broken is determined based on a change in a detection signal according to a load received from the yarn. Even in a multi-twisting machine of a hollow spindle of a stage feeding type, there is a signal level of a detection signal value sufficient for a single yarn breakage determination in a normal twisting state, and it is possible to reliably detect a single yarn breakage.

The means according to the second aspect of the present invention is provided with yarn breakage determining means for determining whether or not a yarn breakage has occurred based on a change in the detection signal. 2. The yarn breakage detecting device for a multi-twisting machine according to claim 1, wherein the single yarn breakage determination is started.
According to the present invention, the yarn break determination can be started from an early stage, and the erroneous determination of a single yarn break during an unstable period at the time of starting can be prevented.

The means according to claim 3 employed in the present invention starts the yarn break determination during acceleration of the spindle and starts the single yarn break determination after the spindle reaches the target speed. Is a yarn breakage detecting device. According to the present invention, the yarn break determination can be performed during acceleration until the target speed is reached, and the single yarn break determination can be reliably performed during the stable period after the target speed is reached.

According to a fourth aspect of the present invention, at least one guide for regulating a yarn path is provided downstream of the balloon guide, and a detecting unit for detecting a load received from the yarn downstream of the guide contacts the yarn. A yarn breakage detecting device for a multiple twisting machine according to any one of claims 1 to 3, wherein the yarn breakage detecting device performs a yarn breakage detection. According to the present invention, since another guide is provided on the downstream side of the balloon guide, even if the unwinding state in the spindle device changes and the balloon tension slightly changes,
The load detector is not affected by the other guide, and it is not erroneously determined that the yarn is broken.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below with reference to the embodiments of the invention shown in the drawings. 1 to 7 relate to a first embodiment of the present invention. FIG. 1 is an overall configuration diagram showing a yarn breakage detecting device 1 of a multi-twisting machine of a sun cheese feeding system, and FIG. 2A is a perspective view of a tension sensor 2 of the device 1, and FIG.
3 is a longitudinal sectional view of the tension sensor 2. FIG. 3 is a block circuit diagram showing a control system of the yarn breakage detecting device 1, FIG. 4 is a flowchart of the device 1, FIG. 5 is a diagram showing a stable period of the spindle motor 4 at the start of startup, and FIG. FIG. 7 is a drawing showing voltage fluctuations at the time of a power outage.

As shown in FIG. 1, the sun cheese feeding type multiple twisting machine comprises a plurality of upper and lower (two-stage drawing) yarn feeding packages 5 coaxially with a motor 4 for rotating a spindle 3. , 5 are arranged, and the yarns unwound from both packages 5, 5 are both passed through the central axis and simultaneously twisted. The two yarns led to the outside from the bottom side of the spindle 3 through the center axis are combined to form a balloon. Then, it is wound up by a winding package 8 via a balloon guide 6 and a feed roller 7. In the figure,
Reference numeral 9 denotes a winding drum for rotating the winding package 8, and reference numeral 10 denotes a brake thereof. In the present embodiment, the tension sensor 2 that outputs a detection signal (tension) according to the load received from the yarn Y is disposed on the yarn traveling path between the balloon guide 6 and the feed roller 7, Guides 11a and 11b for regulating the yarn path are arranged on the upstream side and the downstream side of the sensor 2, respectively. Also, a cutter 1 is provided between the downstream guide 11b and the feed roller 7 so as to be able to advance and retreat with respect to the yarn Y traveling on the yarn traveling path.
2 is arranged. Incidentally, as the guides 11a and 11b, a freely rotatable guide roller or a non-rotatable guide that rotates as the yarn Y travels can be used.

The tension sensor 2 is of a contact type, and as shown in FIGS. 2A and 2B, a guide portion 13 which comes into contact with the yarn Y, and a guide having the guide portion 13 attached to the distal end. Support 14 and sensor substrate 15 having elasticity
And a circuit board 16. Guide support 14
Is vertically supported at its base end by the sensor board 15, and transmits the displacement of the guide section 13 to the sensor board 15 via the guide support 14. At an appropriate position on the sensor substrate 15, a strain detecting element 17 whose resistance value changes in proportion to the strain amount is attached. The circuit board 16 is electrically connected to the sensor board 15 by a connection portion 18 so that a change in the resistance value of the strain detecting element 17 can be extracted from the circuit board 16 as a change in voltage. The sensor board 15 and the circuit board 16 are
The guide support 14 projects outside through an opening 20 of the case 19. The opening 2
The size of 0 is slightly larger than its diameter so as to allow displacement of the guide support 14.

The tension of the yarn Y engaged with the guide portion 13 is detected while the yarn Y is bent in the shape of a letter using the guide portion 13 as a bent portion. The detected tension is output as a tension detection signal to the external control unit 21 via the circuit board 16 (see FIG. 3). In addition, the guide part 13 which is a thread contact part in the tension sensor 2 is slightly downstream of the balloon guide 6 which is a balloon converging part. As a result, the unwinding state of the spindle 3 fluctuates, which causes fluctuations in the balloon tension, which is susceptible to the fluctuation. Therefore, a guide between the tension sensor 2 and the balloon guide 6 is used to prevent this. 11a is arranged.

The control unit 21 has a central processing unit (CPU) 23 connected to a host computer 22. The tension detection signal detected by the tension sensor 2 is supplied to the CPU (central processing unit) 23 by an A / D converter.
The signal is input through the converter 24 and the inverter circuit (IN
V) A voltage detection line 26 for detecting a drop in the drive power supply (AC power supply) supplied to the spindle motor 4 via 25 is connected. The inverter circuit (INV) 25 has a CP
The rotation speed of the spindle motor 4 is controlled based on the command from U23. Further, an external input / output device (I / O circuit) 27 is connected to the CPU 23. The CPU 23
Performs a predetermined process based on the input information as shown in the flowchart of FIG. 4 to operate the package brake 10 or the cutter 12. The AC power, which is the driving power supply for the motor 4, is supplied to an AC / DC converter (AC / DC) 31 and an inverter circuit (IN).
V) 25 to be supplied to the motor 4.

Next, the operation of the thread breakage detecting device 1 according to this embodiment will be described with reference to FIGS. The yarn breakage detecting device 1 detects the breakage of all of a plurality of (two) yarns unwound from the yarn supply packages 5 and 5 and unwinds from the yarn supply packages 5 and 5. Single yarn breakage detection that detects that any one of a plurality of (two) yarns is broken. The detection of these yarn breaks or single yarn breaks is performed by setting the threshold value for determining the tension detection signal output from the tension sensor 2 in two stages. That is, in the case of a single thread break in which one thread breaks, the tension is applied to the tension sensor 2 by the remaining one thread, so that the threshold value is set high as shown in FIG. In the case of the cage (level B), in the case of a yarn breakage in which two yarns are broken, the threshold value is set low (level A) because no tension is applied to the tension sensor 2 at all.

In the initial stage when the operation of the spindle motor 4 is started, there is an unstable period for performing the detection of the yarn breakage detection and the single yarn breakage detection. Therefore, in this embodiment, each detection is performed while eliminating the determination processing during the unstable period. That is, during the start-up of the spindle motor 4 from (Start in Fig. 4) until time T ₁ (approximately 2 seconds) has elapsed since operation of the spindle motor 4 is not stable, during which all the yarn breakage detection And the detection of the breakage of the single yarn is not performed. Then, only after the elapse of a predetermined time (T ₁ ) from the start of the start of the spindle motor 4, only the detection of the thread break is started. Immediately after the rotation speed of the spindle motor 4 reaches the set rotation speed (target rotation speed) (immediately after the end of the acceleration period), the motor rotation speed performs a hunting operation (see FIG. 5). It does not start cutting detection. This is because if the spindle motor 4 has hunting or the like, it affects the fluctuation of the tension of the yarn Y, and it is impossible to accurately detect the tension value of the yarn Y. Thread break detection is performed during this time (T
₂ ). Then, when a predetermined time T ₂ (approximately 10 seconds) elapses after reaching the set number of revolutions, the detection of the single yarn breakage is started. As described above, after the lapse of T ₁ from the start of the start, the time T ₁
Until _two passes, only thread break detection is performed, and after that, both thread break detection and single thread break detection are performed. After the spindle motor 4 reaches the set number of revolutions,
It is rotated at a constant speed so as to maintain the rotation speed.

As described above, during the stable period excluding the unstable period of the spindle motor 4, the yarn breakage detection and / or the single yarn breakage detection are performed. Specific detection judgment
In the case of a single yarn break, the magnitude of the tension detection signal value α during the stable period varies from one weight to another, so that the tension signal value during the stable period is not determined based on a fixed threshold. α
Is determined based on the threshold value. That is, it is determined whether or not the deviation rate between the previous tension detection signal value α (n-1) and the current tension detection signal value α (n) is within a predetermined range. As described above, since the threshold value for determination is set based on the tension detection signal value α during the stable period, accurate determination can always be performed even when the tension value at the time of stability differs depending on the weight or the thread type. When a single yarn break is confirmed, the spindle motor 4 is stopped, and the package brake 10 of the winding drum 9 is operated or the cutter 12 is operated to stop winding and / or cut the yarn Y. Make sure that no defective package is discharged. On the other hand, in the case of detecting a thread break, if the tension detection signal value α falls below a preset threshold level A (fixed value), it is determined that the thread has broken, the spindle motor 4 is stopped, and the package of the winding drum 9 is mounted. By operating the brake 10 or the cutter 12, the winding is stopped and / or the thread Y is cut to prevent the defective package from being discharged.

Further, if there is an instantaneous voltage change due to a power failure due to a lightning strike or the like, this may cause a change in the number of revolutions of the spindle motor 4, and there is a possibility that accurate detection of the thread tension cannot be performed. Therefore, in the present embodiment, when the power failure signal P-Fail is output from the voltage detector 26 to the CPU 23, the thread breakage detection and the single yarn breakage detection are not performed during the output. after T ₃ hours has elapsed since the end of the power failure signal, so as to resume the yarn breakage detection and single yarn breakage detection. As a result, it is possible to prevent erroneous detection during an unstable period of the rotational speed after the recovery from the instantaneous stop.
In addition, after such an instantaneous stop, it is preferable to restart the yarn breakage detection and the single yarn breakage detection at the same time.

FIG. 8 relates to a second embodiment of the present invention, and is an overall configuration diagram showing a yarn breakage detecting device 28 of a hollow yarn feeding type multiple twisting machine. FIG.
The same reference numerals as in the case of (1) denote the same members. This hollow spindle type multiple twisting machine twists the yarn unwound from one yarn supply package 29 through the central axis and twists the yarn unwound from the external yarn supply package 30 into the spindle from below. The thread is inserted and ballooned in a state where the two threads are combined to be combined. There is no difference from the case of the above-described first embodiment other than the difference of the joining method.

Incidentally, the present invention is not limited to the above-described embodiment, but can be appropriately changed. For example, in the multi-twisting machine of the sun cheese feeding system shown in FIG. 1 and the multi-twisting machine of the hollow spindle feeding system shown in FIG. 8, the yarn unwound from one yarn supply package can be twisted. In this case, the determination of the yarn breakage may be made in the same manner as the yarn breakage detection in the above-described embodiment. Further, the magnitude of the threshold value, the parameter for determination, and the set times T _{1 to} T ₃ can be arbitrarily set according to the purpose. Further, the information of the yarn breakage and the single yarn breakage is transmitted to the host computer 22 and stored in the data, and the statistics are taken and compared with a specific parameter.
It is possible to determine whether the maintenance of a specific weight is necessary, and there is an advantage that the maintenance and management of the entire multi-twist system can be performed. Furthermore, a DC brushless motor is used as the spindle motor 4, and the control unit 21 performs feedback control of the spindle motor 4 based on the number of rotations detected by a rotation detector (not shown) to reduce load fluctuations during normal twisting. It is possible to reduce the size and to perform high-precision yarn breakage detection and single yarn breakage detection.

In addition, in the present invention, a plurality of control units 21 are connected to a host computer 22 via a common communication line, and each control unit 21
Thread break and / or single thread break information may be transmitted to the host computer 22 via a communication line. By doing so, the host computer 2
2, the operator can easily determine the necessity of maintenance by comparing and displaying the thread breakage information (number of times) and / or the single thread breakage information (number of times) for the plurality of spindles 3. . The host computer 22
In the above, a reference value for determination is set based on the distribution state of the thread breakage information and / or single thread breakage information for the plurality of spindles 3, and a pass / fail determination is made for each spindle 3 based on the reference value for determination. In particular, it is possible to automatically specify the spindle 3 having a particularly large number of thread breaks and / or single thread breaks.

[0021]

As described above, in the present invention,
In a multiple twisting machine in which a plurality of yarns are combined and wound while the yarn is ballooned and twisted by rotation of a spindle, whether or not a single yarn breaks based on a change in a detection signal according to a load received from the yarn. Whether it is a multi-threading machine of sun cheese of the upper and lower two-stage feeding system or a multi-threading machine of the hollow spindle of the single-stage feeding system, it is determined that the single yarn breaks in a normal twisting state. Has a sufficient signal level of the detection signal value, and it is possible to reliably detect breakage of a single thread. That is, as in the case of the detection based on the load current in the single-spindle drive type, the detection of the single yarn break can always be accurately performed without depending on the usage mode.

In the present invention, there is further provided a yarn breakage judging means for judging whether or not the yarn breakage has occurred based on a change in the detection signal. Since the determination is started, the yarn break determination can be started from an early stage, and the erroneous determination of a single yarn break during the unstable period at the time of starting can be prevented.

Further, in the present invention, the thread break determination is started during acceleration of the spindle, and the single thread break determination is started after the spindle reaches the target speed. The yarn breakage determination can be performed during acceleration, and the single yarn breakage can be reliably determined during the stable period after the target speed is reached.

Further, in the present invention, at least one guide is provided on the downstream side of the balloon guide, and the detection unit of the load received from the yarn downstream of the guide comes into contact with the yarn. The state of unwinding in the fluctuates, even if the balloon tension fluctuates somewhat, the load detection unit is not affected by the another guide,
There is no erroneous determination that the yarn is broken.

[Brief description of the drawings]

FIG. 1 relates to a first embodiment of the present invention,
BRIEF DESCRIPTION OF THE DRAWINGS It is a whole block diagram which shows the thread breakage detection apparatus of the multiple twisting machine of a sun cheese supply system.

2A and 2B show a yarn breakage detecting device according to a first embodiment of the present invention, wherein FIG. 2A is a perspective view of a tension sensor of the device, and FIG. 2B is a longitudinal section of the tension sensor. FIG.

FIG. 3 is a block circuit diagram showing a control system of the yarn breakage detecting device according to the first embodiment of the present invention.

FIG. 4 is a flowchart of the thread breakage detecting device according to the first embodiment of the present invention.

FIG. 5 is a drawing showing a stable period of the spindle motor at the start of starting of the thread breakage detecting device according to the first embodiment of the present invention.

FIG. 6 is a drawing showing detection signal values of a tension sensor of the yarn breakage detecting device according to the first embodiment of the present invention.

FIG. 7 is a diagram showing a voltage fluctuation at the time of a power failure of the yarn breakage detecting device according to the first embodiment of the present invention.

FIG. 8 relates to a second embodiment of the present invention,
BRIEF DESCRIPTION OF THE DRAWINGS It is a whole block diagram which shows the thread breakage detection apparatus of the multiple splicing machine of a hollow spindle feeding system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Yarn breakage detecting device, 2 ... Tension sensor, 3 ... Spindle, 4 ... Spindle motor, 5 ... Yarn supply package,
Reference numeral 6: balloon guide, 7: feed roller, 8: winding package, 9: winding drum, 10: package brake, 11a: upstream guide, 11b: downstream guide, 12: cutter, 28: thread breakage detection apparatus

Claims (4)

[Claims] In a multi-twisting machine for winding and twisting a plurality of yarns while twisting and twisting the yarn by spinning a spindle, detection according to a load received from the yarn in contact with a running yarn. A yarn breakage detecting device for a multi-twisting machine, comprising: a detector that outputs a signal; and a single yarn breakage determination unit that determines whether or not a single yarn is broken based on a change in the detection signal. 2. A thread breakage judging means for judging a thread breakage based on a change in a detection signal.
2. The yarn breakage detecting device for a multiple twisting machine according to claim 1, wherein the single yarn breakage determination is started later than the start timing of the yarn breakage determination. 3. The yarn breakage detecting device of a multi-twisting machine according to claim 2, wherein the yarn breakage determination is started during acceleration of the spindle, and the single yarn breakage determination is started after the spindle reaches the target speed. 4. The apparatus according to claim 1, wherein at least one guide for regulating a yarn path is provided downstream of the balloon guide, and a detection unit for detecting a load received from the yarn downstream of the guide contacts the yarn. A yarn breakage detecting device for a multiple twisting machine according to any one of the preceding claims.