JPH09296331A - Detecting device for yarn cutting of yarn doubling false twister - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject device capable of simply detecting a yarn cutting and cutting all doubled yarns even when only one of plural doubled yarns is cut for preventing an inferior product from generating or the yarn from twining around to a rotating part by setting up so as to cut all doubled yarns when the degree of decrease in a tension for untwisting reaches at a set value. SOLUTION: This detecting device for a yarn cutting of a yarn doubling false twister, is provided by (stretching) false twist processing a filament yarn Y unwound from a yarn supplying package through a cutter 2, between a first feed roller FR1 and a second feed roller with a primary heater H1, a cooling plate L2 and a false twisting device 9, detecting a tension for untwisting by an untwisting tension detecting device 1, and inputting the result to a controlling part 6. The good yarn doubled by an intertwining treatment device IL is wound by a winding device through a detecting device 3 for yarn cutting. When the degree of a decrease in the tension for untwisting reaches at a set value, the controlling part 6 activates the cutter 2 for cutting the yarns Y, Y.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a twisting device for false twisting a plurality of yarns, such as a non-torque yarn by combining an S-twisted yarn and a Z-twisted yarn, and a yarn having different thicknesses and characteristics. There is a case where a composite yarn is manufactured by combining yarns. The present invention provides a composite yarn false twisted yarn having a control device for cutting all the yarns to be combined when one of the plurality of yarns to be combined is cut. The present invention relates to a yarn breakage detection device of a yarn false twisting machine.

[0002]

2. Description of the Related Art Not only a mixed yarn but also a single yarn is forcibly fed by a feed roller in a false twisting machine. Therefore, when a yarn breaks in the middle of a route, the yarn fed from the upstream side of the yarn breakage point. Is entangled in the equipment, so it is necessary to cut it before the upstream feed roller. Generally, the electrostatic type yarn breakage detection device is used to detect whether or not there is a yarn in the detection part. When used for, it will not operate unless all the yarns that make up the composite yarn are broken. That is,
If even one of the constituent yarns is not broken, it will not operate. For this reason, in order to detect yarn breakage, a mechanical yarn breakage detection device is also provided upstream of the first feed roller, which is on the upstream side where the yarns are combined, and which does not affect the propagation of false twist. The thread breakage has been detected for each thread.

FIG. 6 shows a conventional schematic view, and a mechanical yarn breakage detecting device 4 is provided between the cutter 2 and the first feed roller FR1. The supplied yarn Y passes through the cutter 2 and the mechanical yarn breakage detection device 4 and then the first feed roller FR.
1. Primary heater H1, cooling plate L2, false twisting process by false twisting device 9, untwisting tension is detected by untwisting tension detecting device 1, and yarn is detected by entanglement processing device IL, then yarn breakage detecting device The combined yarn is wound up by the winding device W after passing through 3.
In this case, if only one of the yarns forming the composite yarn after the first feed roller FR1 is broken and the shaft of the feed roller is wound, the mechanical yarn breakage detection device 4 There is a yarn Y in the yarn, and the electrostatic yarn breakage detecting device 3 also has one or more yarns that compose the composite yarn, and therefore cannot be detected.

Regarding the yarn breakage detecting device, the yarn breakage detecting device used in the conventional false twisting machine is classified into a mechanical type and an electrostatic type, and an antistatic agent is used for a partially drawn yarn which is a yarn feeding. In an electrostatic yarn breakage detection device that detects the presence or absence of a thread by the amount of static electricity, it is difficult to detect the presence or absence of the thread because the thread is hardly charged, and the presence or absence of the thread can be detected by contacting the thread. A mechanical yarn breakage detecting device for detecting is used. Since this antistatic agent loses its effect immediately by heat, an electrostatic yarn breakage detection device that is gentle to the yarn after it has passed through the primary heater is used.

[0005]

As described above, in the case where the mechanical yarn breakage detecting device is provided on the upstream side of the conventional first feed roller, the problem of yarn breakage occurs first. Means that the defective yarn continues to be manufactured without noticing that the composite yarn is no longer the composite yarn because the yarn is broken at a position downstream of the detection device. Furthermore, the yarn end on the downstream side where the yarn breaks is wound up in the winding package,
The upstream yarn end may be entangled with the rotating portion of the feed roller shaft or the like without being wound up. If the yarn becomes entangled in the rotating part, the yarn will continue to be fed into a lump, but even in this case the yarn breakage detection device cannot detect it, and in the worst case, stop the machine base and remove the entangled yarn lump. It will require work. Therefore, it is preferable that the yarn breakage detection device is provided on the downstream side, which is the winding device side as much as possible. However, as described above, the electrostatic or mechanical yarn breakage detection device is not suitable for detecting the yarn breakage after the yarn is combined. As the electrostatic yarn breakage detection device, a high performance device capable of detecting a single yarn breakage in the combined yarn is provided, but it is too expensive to use.

[0006] The present invention has been made by focusing on such problems existing in the prior art. The problem is to provide a simple yarn breakage detection device. Further, another problem is that even if one of a plurality of yarns to be combined on the downstream side of the first feed roller is broken, the yarn breakage is detected and all the combined yarns are cut. is there.

[0007]

In order to achieve the above object, the invention according to claim 1 is based on detection of a decrease in untwisting tension above a certain level by a tension detecting device for detecting untwisting tension. The fact that one of the threads is broken is detected.

According to a second aspect of the present invention, in the first aspect of the invention, the tension detecting device measures the resultant force of the untwisting tensions of a plurality of yarns to be combined, and the management range is limited. Then, when the untwisting tension decreased beyond that range, it was judged that the yarn was broken. According to the third aspect of the invention, the interlocking movement with the cutter for cutting all the yarns to be combined is configured so that it can be freely turned on and off.

Therefore, according to the first aspect of the present invention, the tension detecting device for detecting the untwisting tension is also connected to the control device for activating the cutter by judging the yarn breakage from the change in tension. When the detected untwisting tension falls below the normal fluctuation range based on the change in the yarn properties, it is assumed that the yarn is broken, and the cutter is operated. The tension value that operates the cutter is
When the tension is zero, the value is close to zero in consideration of an error in setting the zero point, or a value obtained by subtracting the fluctuation range from the untwisting tension.

In the invention described in claim 2, since the untwisting tension of the composite yarn is the sum of the untwisting tensions of the respective yarns constituting the composite yarn, when one yarn is broken, , The tension changes by the untwisting tension of the broken yarn. Since the untwisting tension is constantly changing, when only one yarn constituting the composite yarn is broken, it does not necessarily change by the untwisting tension of the broken yarn. For this reason, the control range is limited, and when the untwisting tension decreases beyond that range, the cutter is operated regardless of the presence or absence of the yarn.

According to the third aspect of the present invention, when the single yarn processing is performed by the base of the false twisting twisting machine, the tension detecting device and the cutter are disconnected from each other.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A drawing false twisting machine M, which is a typical example using the yarn breakage detecting device of the present invention, is for subjecting a melt-spun synthetic fiber yarn to a texture process, an example of which is a side view. As shown in FIG. Ps is a yarn supply package, which is held by a creel stand S. L1 is a guide pipe that guides the filament yarn Y released from the yarn supply package Ps to the first feed roller F1. H1
Is a primary heater, and the yarn Y is false twisted by the false twisting device 9.
Heat treatment. 9 is a false twisting device. L2 is a cooling plate for cooling the yarn heat-treated by H1 to fix the characteristics.
IL is an entanglement processing device, and is a yarn Y composed of a plurality of fiber bundles.
Can be entangled with a fluid at substantially regular intervals, and a plurality of single yarns can be entangled to form a composite yarn. Further, when the entanglement treatment is performed, the unwinding property is improved in both the case of the composite yarn and the case of the single yarn. O is an oiling roller for applying oil to the yarn Y. W is a winding device that winds the yarn Y around the package Pw.

As shown in FIG. 2, the draw false twisting machine M is provided with a creel stand S along a machine stand K, and unwinds and guides the filament yarn Y of the yarn supplying package Ps supported by the creel stand S. It is guided to the first feed roller F1 by the pipe L1. A cutter 2 is provided at the yarn outlet of the guide pipe L1. Further, the primary heater H1 for texturing, the cooling plate L2 and the false twisting device 9,
Untwisting tension detecting device 1 provided to obtain various information necessary for quality control of the package such as variation of untwisting tension T
And is guided to the second feed roller F2. In this process, the filament yarn Y is stretched, false-twisted and heat-set, and the filament yarn Y is bulked. Then, after the yarn is combined by the entanglement processing device IL, the third feed roller F3, the fourth feed roller F4, the yarn breakage detection device 3, and the working path L
3. The winding device W takes up the package Pw via the oiling roller O.

As for the construction of the main part of the false twisting machine M of the present invention, referring to FIG. 1 which is a schematic view, 3 is a yarn breakage detecting device, and when the yarn breakage is detected, the cutter 2 is actuated. Y
Disconnect. Reference numeral 1 denotes an untwisting tension detecting device which also functions as a yarn breakage detecting device. The built-in sensor 5 obtains various information necessary for quality control of the package such as fluctuation of the untwisting tension T and sends a signal to the controller 6. The untwisting tension T of the yarn Y is controlled based on an appropriate signal sent from the control unit 6 to a contact pressure control means such as a cylinder (not shown) for adjusting the contact pressure of the false twisting device 9. In addition, when the untwisting tension T shows a fluctuation exceeding the control range, it is set that the yarn is broken, and the cutter 2 is operated by the signal of the control unit 6.

In the case of normal winding, the supplied yarn Y
Is false twisted by the first feed roller FR1, the primary heater H1, the cooling plate L2, and the false twisting device 9 through the cutter 2, and the untwisting tension detecting device 1 detects the untwisting tension T and inputs it to the control unit 6. To be done. The untwisting tension T from the sensor 5 is input to the control unit 6 in advance by inputting the target value of the untwisting tension, and at the same time, the upper limit value Tu and the lower limit value Td of the tension, which are control ranges for the target value To. Based on the above, the untwisting tension T of the false twisting device 9 is controlled to the target value To through the contact pressure control means. Then, the high-quality yarn Y whose untwisting tension T is controlled to fall within the target range is combined by the entanglement processing device IL, and then combined by the winding device W through the yarn breakage detection device 3. Take up the composite yarn.

As a first embodiment in which the untwisting tension detecting device 1 incorporates a plurality of sensors 5, the sensors 5 are shown in FIG.
Shown with two built-in. The composite yarn is formed by combining two yarns, and the yarn paths are separate and two moving guide rollers 8 and two sensors 5 are provided so that the untwisting tension T can be detected for each yarn Y. .

In the untwisting tension detecting device 1 provided with a plurality of sensors, as the untwisting tension T of the composite yarn,
For example, even if it is 100 g, the untwisting tension of one yarn may be 70 g and the untwisting tension of the other yarn may be 30 g. This is because it is possible to manufacture a yarn in which it is better to control each tension.

As shown in FIG. 3, the untwisting tension detecting device 1 is
A yarn path is created by a guide 7 having a fixed shaft and a guide 8 that moves in accordance with the tension of the yarn in association with the sensor 5, and the untwisting tension of the yarn Y passing through the yarn passage is measured. One yarn Y falsely twisted by the false twisting device 9 passes through the yarn path. If the untwisting tension detecting device 1 is normally fluctuated, if necessary, the untwisting tension of the yarn Y is controlled by controlling the cylinder 6 that adjusts the pressing force of the false twisting device T to increase the untwisting tension. Produces quality yarn. Here, for example, a single yarn 1 having two composite yarns YC
It is composed of YA of 50 denier and YB of 75 denier, and the untwisting tension T of the yarn YA is 70 g and the untwisting tension T of the yarn YB.
Considering the yarn breakage when the weight is 30 g, assuming that the yarn YB breaks, the untwisting tension T of YB
The untwisting tension T of the sensor 5 for detecting the yarn becomes a value near 0, and the cutter 2 is operated by judging that the yarn is broken, and the yarn YA, Y
Cut B.

In this case, one sensor 5 detects the untwisting tension T of one yarn Y. When the untwisting tension T becomes 0, it should be considered that the yarn is broken. Although it is not impossible to do this, as can be understood by actual experimentation, there are errors, etc., and the untwisting tension T does not easily reach 0 even if yarn breakage occurs. In consideration of the error and the fluctuation range of the untwisting tension T, it may be determined that the yarn breaks when the untwisting tension T is close to zero. Further, it is possible to judge that the yarn breaks when the untwisting tension T of the single yarn is largely changed, for example, about half or more of the untwisting tension T is changed.

In the first embodiment, the description has been made assuming that the number of yarns forming the composite yarn is two, but the number of yarns forming the composite yarn is not necessarily limited to two, and therefore one untwisting tension detecting device 1 is used. Needless to say, the cutter 2 to be operated in accordance with (4) can be freely set according to the number of yarns forming the composite yarn. The number of sensors 5 incorporated in the untwisting tension detecting device 1 is not limited to two, and it is preferable that the number of sensors 5 be the number that composes the composite yarn.

Next, the second embodiment is shown in FIG.
The untwisting tension detecting device 1 has one sensor 5, the fixed guide roller 7 associated with it has one thread groove, and the moving guide roller 8 has one, so that a single yarn constituting a composite yarn is formed. The difference is that the number is less than the number of, but other basic configurations are the same. In the example shown in FIG. 4, the number of single yarns forming the composite yarn is two, and the number of the sensor 5 is one. Therefore, in the sensor 5, two yarns Y that have been falsely twisted by the false twisting device 9 pass, and the untwisting tension T of the entire composite yarn is measured. The yarn Y is falsely twisted by the false twisting device 9 in the yarn path.
One passes. When the untwisting tension detecting device 1 has a normal fluctuation, the target range is set so as to reach the target value To of the untwisting tension, and the control lower limit value is set as the control lower limit value within the allowable limit range.
Is input to The contact pressure and the untwisting tension T of the false twisting device 9 have the following relationship because the false twisting device 9 is a belt type in the present embodiment. When the contact pressure of the contact pressure control means increases, the yarn delivery speed increases in proportion to the belt contact pressure, and the untwisting tension T decreases. On the contrary, when the contact pressure of the contact pressure control means is decreased, the slip between the yarn and the belt is increased, the feeding amount is decreased, and the untwisting tension T is increased.

The control of the contact pressure of the belt of the false twisting device 9 will be described with reference to FIG. When the untwisting tension T is on the vertical axis and the horizontal axis is time, the contact pressure of the belt is controlled by controlling the contact pressure control means by a signal from the control unit 6. When the value of the untwisting tension T detected by the untwisting tension detection device 1 and sent to the control unit 6 becomes higher and exceeds the upper limit value Tu, a signal is sent from the control unit 6 to the contact pressure control means and the false twisting device. The contact pressure between 9 and the yarn Y is increased, that is, the contact pressure of the belt is increased. Then, the untwisting tension T that had risen begins to fall, and the upper limit Tu
It becomes the following. Then, the controller 6 continues to send a signal to the contact pressure control means toward the target value To to increase the contact pressure of the belt and decrease the untwisting tension T. On the contrary, when the value of the untwisting tension T sent to the control unit 6 becomes lower and the lower limit value Td is exceeded, a signal is sent from the control unit 6 to lower the contact pressure of the contact pressure control means to reduce the contact pressure of the belt. Lower. Then, the untwisting tension T, which has been decreasing, begins to increase and becomes equal to or higher than the lower limit Td. Then, the contact pressure of the belt is further lowered toward the target value To and the untwisting tension T is increased. By repeating this series of control of the contact pressure control means, the untwisting tension T is controlled to reach the target value To. Since the untwisting tension T of the entire composite yarn is the sum of the individual single yarns that make up the composite yarn, when yarn breakage occurs, it is the sum of the untwisting tensions excluding the broken yarns. Become. That is, the target value To is set for the entire composite yarn, and the upper limit value Tu, the lower limit value Td, and the control lower limit value Tmin are further set. If one single yarn breaks, the untwisting tension value of the broken yarn decreases. Therefore, it may be determined that the yarn breaks when the value falls below the control lower limit value Tmin.

Suppose now that the composite yarn YC is composed of two single yarns of 150 denier YA and 75 denier YB, the yarn YA has an untwisting tension of 70 g, and the yarn YB has an untwisting tension of 30 g. Consider a case where YB causes yarn breakage and the yarn end is entangled with the shaft of the first feed roller FR1. The untwisting tension T of the composite yarn YC is 100 g, which is the sum of the untwisting tensions of the yarn YA and the yarn YB. Therefore, the target value To is 100
g, and when the untwisting tension T is about 100 g, the fluctuation range is about 3 g to 5 g at the upper and lower sides, and assuming that it is 5 g, the upper limit Tu is 1
The false twisting device 9 is controlled so that the lower limit Td becomes 05 g and the lower limit Td becomes 95 g so that the untwisting tension T falls within the target range. When the yarn breakage occurs, the untwisting tension detecting device 1
A value of 75g from which the fluctuation range was changed from 00g to 70g
To about 65 g. Control lower limit value Tmin
Is set to about 90 g, the control lower limit value Tm
Since it is less than in, it is judged as a thread break and the cutter 2
To cut the yarns YA and YB. As can be understood from the above, when the other yarn YA is broken, a detection value as shown by the dotted line in FIG. 5 is obtained.

In the embodiment described above, only the production of the composite yarn is described, but in some cases not only the processing of the composite yarn with one machine but also the false twisting of the single yarn is desired. In the case of such single yarn processing, if the yarn breakage is detected on the basis of the detection value of the untwisting tension detection device 1, the cutter 2 may be operated unnecessarily and the operating efficiency may be reduced. . For example, as shown in FIG. 3, in the case of the untwisting tension detecting device 1 which detects the untwisting tension of one yarn with one sensor, since only a single yarn is present, a particularly thin yarn is false twisted. The reference value itself of the untwisting tension T detected in this case is low. This is erroneously recognized as a thread break. In order to prevent this erroneous recognition, a structure for turning on and off the interlocking with the cutter 2 is provided in the control device, so that a false twisting twisting machine that can be used for single yarn processing can be obtained. The yarn breakage in this case is detected by the electrostatic yarn breakage detection device 3 as in the conventional case.

The present invention may be embodied as follows. (1) The thickness and the untwisting tension T of the composite yarn are not limited to the numerical values described in the embodiments, and can be applied to various cases of the composite yarn. Further, the false-twisting machine M is not limited to the one described in the embodiment, and can be applied to all false-twisting machines. Of course, since the number and types of the yarns Y constituting the composite yarn to be manufactured are various, the untwisting tension T for performing the yarn cutting can be set freely, and the cutter 2 to be operated can also be selected.

[0026]

Since the present invention is configured as described above, it has the following effects.

According to the first aspect of the present invention, the structure of the existing false twisting twisting machine can be utilized only by changing the program for controlling the untwisting tension and the cutter, and the false twisting machine currently in operation can be used. Can be changed at low cost. Further, the mechanical yarn breakage detecting device, which is conventionally provided for each yarn near the first feed roller, can be eliminated, and the number of parts and the assembling labor at the time of assembling can be reduced. The cost can be reduced. When a yarn breakage occurs and the yarn end is entangled between the first feed roller and the untwisting tension detection device, it is detected because the electrostatic yarn breakage detection device has one or more yarns forming the composite yarn. It was impossible,
There is a large variation in the untwisting tension detected by the untwisting tension detecting device, and by detecting this variation, it is possible to detect the yarn breakage that could not be detected by the conventional method. This makes it possible to prevent continuous production of defective products without noticing that the composite yarn is no longer the composite yarn. Further, the downstream side of the cut yarn is wound up by the winding device, but the upstream yarn end is entangled with the rotating portion such as the shaft of the feed roller, and the machine base is stopped to remove the entangled yarn lump. No work required.

According to the invention described in claim 2, according to claim 1,
In addition to the effect of the invention described in (1), even if the specification of measuring the untwisting tension of a plurality of yarns with one sensor of the untwisting tension detecting device, the cutter can be operated by detecting the yarn breakage.

According to the third aspect of the invention, the false twisting machine for a single yarn can be formed by freely connecting and disconnecting the plurality of cutters depending on whether or not the yarn breakage is detected by the untwisting tension detecting device. It is possible to prevent unnecessary thread cutting when used as. In this case, only the conventional electrostatic yarn breakage detecting device is used.

[Brief description of drawings]

FIG. 1 is a schematic view of a false twisting machine of the present invention.

FIG. 2 is a side view of the false twisting machine of the present invention.

FIG. 3 is a schematic view of an untwisting tension detecting device and a false twisting device used in the first embodiment of the present invention.

FIG. 4 is a schematic view of an untwisting tension detecting device and a false twisting device used in a second embodiment of the present invention.

FIG. 5 is a graph showing the relationship between untwisting tension and yarn breakage.

FIG. 6 is a schematic view of a conventional false twisting machine.

[Explanation of symbols]

 Y yarn M yarn false twisting machine 1 Untwisting tension detector 2 Cutter

Claims (3)

[Claims] Claim: What is claimed is: 1. A false twisted textured yarn is produced which has a control device for cutting all the yarns to be combined when one of the plurality of yarns to be combined is cut. In the false twisting twister, the yarn breakage of the false twisting twister that detects that one of the yarns has been broken based on the detection of a decrease in the untwisting tension above a certain level by the tension detection device that detects the untwisting tension Detection device. 2. The tension detecting device measures the resultant force of the untwisting tensions of a plurality of yarns to be combined, and the management range is limited, and when the untwisting tension decreases beyond the range, the yarn is detected. The yarn breakage detecting device of the false twisting machine according to claim 1, which judges that the yarn breaks. 3. The yarn breakage detecting device for a false twisting and twisting machine according to claim 2, wherein the interlocking with a cutter for cutting all the yarns to be combined is configured so that it can be freely turned on and off.