JP4027461B2 - Alternating twisted yarn manufacturing method and twisting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a twisted yarn and a twisting device used therefor, and particularly to a method for producing an alternating twisted yarn in which Z-twisted regions and S-twisted regions are alternately present along the longitudinal direction of the yarn, and the implementation of the method. It relates to a suitable twisting device.
[0002]
[Prior art]
An example of alternating twisted yarns and a method for producing the same is disclosed in Japanese Patent Application Laid-Open No. 8-246280. In the conventional method disclosed in this publication, the original yarn is drawn continuously or intermittently from the stationary feeding bobbin, and the drawn raw yarn is inserted into a twisting device that rotates intermittently in one direction to apply the twist intermittently. Then, this is wound around a winding bobbin and then heat set. As the twisting device, a pin provided with a V groove for winding the yarn in the center of the inside of the rotating cylindrical body was provided in a direction perpendicular to the axis, and a nipper for gripping the yarn using centrifugal force was provided. Things are shown. The yarn is twisted by the rotation of the cylinder 21 as it passes through the cylinder. The twist applied to the yarn is in the opposite direction before and after the twisting device (the entry side and the delivery side).
[0003]
In the above publication, it is shown that a friction resistor and a heater are disposed along the yarn path in order to fix the twists in opposite directions applied to the front and rear of the twisting device. It has been shown that alternating twisted yarns can be obtained without a body or heater.
[0004]
When the yarn is twisted by providing a twisting device between the feeding bobbin and the take-up bobbin, the total number of twists generated before and after the twisting device is the same, so when the yarn on the entry side passes through the twisting device, Since the twist on the entry side for the length that has passed is sent to the sending side, which will untwist the twist applied to the sending side, twisting in some way so that such untwisting does not occur It is conceivable that alternate twisted yarns cannot be produced unless the thread is fixed. In practice, however, the yarn on the sending side is untwisted by being wound on the take-up bobbin, so the number of twists remaining in the untwistable state on the sending yarn is the total twist on the entry side. Less than the number. Therefore, after the twisting device is rotated, the yarn on the sending side and the yarn on the entering side are respectively twisted in the opposite directions, and after the yarn in the twisted state on the sending side is wound around a length take-up bobbin, the twisting device is When the yarn is stopped and the yarn continues to be fed, the twist on the sending side is untwisted by the yarn on the entry side that has passed through the twisting device, and further twisted in the opposite direction and wound around the take-up bobbin and fixed. By repeating the rotation and stop of the device in the same direction, the yarn whose alternating twisting direction is wound on the winding bobbin.
[0005]
[Problems to be solved by the invention]
However, as can be understood from the above explanation, when the twist before and after the twisting device is not fixed with a friction resistor or a heater, the twist on the sending side is unraveled by sending the twist on the entry side together with the yarn to the sending side. The yarn before and after the twisting device because the twisting in the opposite direction is applied to the yarn on the sending side when the twisting device starts to rotate again, and the twist is reduced accordingly. Although it depends on the length of yarn and the yarn feeding speed, it can be twisted at most 2500 times / m, generally about 2000 times / m, and the yarn feeding speed cannot be increased, resulting in low productivity. .
[0006]
In order to produce an alternating twisted yarn that is twisted to some extent at a practical speed, it is necessary to provide a friction resistor and a heater for preventing twisting back along the yarn path. However, if a frictional resistor or a heater is provided, the yarn becomes fuzzy or the running cost increases.
[0007]
In addition, there is a conventional method in which twist is applied to the yarn by a swirl flow, but it is impossible to apply strong twist to the yarn by such a method.
[0008]
Therefore, the present invention provides a method capable of more efficiently producing an alternating twisted yarn having a high number of twists without providing a twist fixing means such as a friction resistor or a heater for preventing twist back before and after the twisting device, and It is an object to obtain a twisting apparatus particularly suitable for the method.
[0009]
[Means for Solving the Problems]
In the method for producing the alternating twisted yarn according to the present invention, the raw yarn 1 is continuously drawn out from the feeding bobbin 2, and the drawn raw yarn 1 is inserted into a twisting device 6 that repeats forward rotation and reverse rotation at a predetermined time interval. The yarn sent out from the device 6 is taken up on a take-up bobbin 9. In the method of the present invention, as the twisting device, a support shaft 22 is mounted in a cylinder of a cylindrical body 21 that is rotationally driven around a central axis so as to be inclined in the axial direction from the diametrical direction. A twisting device having a structure having a groove 23 around which a yarn is wound is used. The original yarn 1 drawn out from the feeding bobbin 2 is wound once in the direction in which it is drawn obliquely from the groove 23 without contacting the incoming yarn and the fed yarn, and is inserted into the cylindrical body 21 of the twisting device 6. The twist is imparted by the rotation of the cylindrical body.
[0010]
The twisting device having the above structure is suitable for reliably imparting a strong twist. A plurality (practically two) of twisting devices 6a and 6b are provided in series along the yarn path, and the upstream twisting device 6a in the yarn traveling direction is faster than the downstream twisting device 6b. By rotating, a stronger twist can be imparted than when one twisting device is used. The plurality of twisting devices 6a and 6b are simultaneously forward and reverse in the same direction.
[0011]
In the twisting device 6, 6a, 6b of the present invention, a support shaft 22 is mounted in a cylinder of a cylindrical body 21 that is rotationally driven around a central axis so as to be inclined in the axial direction from the diameter direction. A groove wheel 24 having a groove 23 around which a thread is wound is rotatably mounted, and the support shaft 22 has a lead-out end of the thread wound around the groove 23 of the groove wheel on the central axis of the cylindrical body 21. In this way, it is deviated from the center of the cylindrical body 21 by an amount substantially equal to the radius of the grooved wheel 24. The yarn is inserted through the cylindrical body of the twisting device, and is drawn out in a state of being wound around an internal grooved wheel.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 schematically shows an example of an apparatus for producing alternating twisted yarns using the method of the present invention. The feeding bobbin 2 around which the raw yarn 1 is wound is supported in a vertical direction on a support base 3 fixed to a twisting machine frame (not shown) and cannot rotate. A yarn guide 4 and a feed roller 5 are disposed immediately above the bobbin 2, and a twisting device 6 is provided at a position spaced from the feed roller 5 by a distance L ₁ . A guide roller 7 is disposed above the twisting device 6 with a gap L ₂ , and a feed roller 8 and a take-up bobbin 9 are further disposed above.
[0013]
As shown in FIG. 2, the twisting device 6 has a support shaft 22 that is inclined obliquely from the diameter direction to the axial direction inside the cylindrical body 21, and a thread is wound around the periphery of the support shaft. A grooved wheel 24 having U or V grooves 23 is attached to the shaft so as to be freely rotatable. The cylindrical body 21 is pivotally supported by a bearing (not shown) on the outer peripheral side thereof, and is connected to a rotational drive source that can rotate forward and backward. Note that the support shaft 22 is offset from the center of the cylindrical body by an amount substantially equal to the radius of the grooved wheel 24 so that the drawn end of the thread wound around the groove 23 of the grooved wheel is on the central axis of the cylindrical body 21. It has become.
[0014]
The twisting device 6 is arranged on the side closer to the guide roller 7 than the center of the yarn path between the feed roller 5 and the guide roller 7, with the central axis of the cylindrical body coinciding with the yarn path. The thread 1 is inserted into the cylindrical body 21, wound around the groove wheel 24 only once, and pulled out from the opposite side. Since the groove wheel 24 is attached to the inclined support shaft 22, both ends of the yarn wound around the groove wheel 24 are drawn obliquely from the groove 23, and the yarn enters the groove wheel 24. Are not in contact with the thread being fed out. By using such a grooved wheel, when the entry side yarn is strongly twisted and the yarn is unwound when the yarn is fed out of the groove wheel 24, the entry side yarn It is possible to avoid a situation in which the yarn on the sending side rubs against each other to generate fluff or entangles the yarn to cause breakage. In the method of the present invention, it is particularly effective to use a twisting device as shown in FIG. 2 in order to apply strong twisting in opposite directions to the yarns before and after the twisting device 6.
[0015]
FIG. 3A shows an apparatus for producing the alternating twisted yarn as shown in FIG. 1, wherein the distance L ₁ between the feed roller 5 and the twisting device 6 is ₁ m, and the distance L ₂ between the twisting device 6 and the guide roller 7. = 0.25 m, guide yarn when the twisting device is rotated in the same direction for 4 seconds and stopped for 4 seconds at a feed speed V of 0.25 m / s and a rotational speed of 2000 rps (conventional method). 7 is a diagram showing a change in the number of twists (unit: times / m) given to a yarn passing through No. 7. FIG. The twist 26 in the plus direction in the figure is generated when the twisted one on the entry side of the twisting device 6 passes through the twisting device 6 together with the yarn and is sent to the sending side.
[0016]
FIG. 3B shows a yarn that passes through the guide roller 7 when the twisting device 6 is alternately rotated at +2000 rps for 4 seconds and -2000 rps for 4 seconds under the same conditions as described above. It shows the result of calculating the number of twists imparted to. FIG. 3C shows the guide roller 7 when the twisting device 6 is rotated alternately with a stop period of 1 second between the rotation of +2000 rps for 3 seconds and the rotation of −2000 rps for 3 seconds. The number of twists per meter that occur in the passing yarn is calculated. Here, the stop period of 1 second is provided to approximately show the influence of the rise time necessary for the twisting device to reverse.
[0017]
4A, the distance L ₂ between the twisting device 6 and the guide roller 7 is 0.5 m, and other conditions are applied to the yarn passing through the guide roller 7 portion in the same manner as in FIG. 3C. The result of calculating the number of twists is shown.
[0018]
FIG. 4 (b) shows that the interval L ₂ between the twisting device 6 and the guide roller 7 is 0.9 m, and that 1 second is obtained between the rotation of +2000 rps for 6 seconds and the rotation of −2000 rps for 6 seconds. This shows the result of calculating the number of twists per meter generated in the yarn passing through the guide roller 7 portion when the twisting device 6 is rotated alternately with the stop period of.
[0019]
(C) in FIG. 4 shows that the interval L ₂ between the twisting device 6 and the guide roller 7 is 1.5 m, and 1 second in the above-described manner between the rotation of +2000 rps for 6 seconds and the rotation of −2000 rps for 6 seconds. 6 shows the result of calculating the number of twists per 1 m generated in the yarn passing through the guide roller 7 portion when the twisting device 6 is rotated alternately with the stop period of.
[0020]
As can be understood from the above figures, by adopting the method of the present invention, the number of twists in the positive direction and the negative direction applied to the yarn passing through the guide roller 7 portion, that is, the yarn wound around the winding bobbin 9. Is much larger than the conventional method of FIG. 3A in which rotation and stop in one direction are intermittently performed. This is because when the yarn on the entry side twisted in the opposite direction moves to the delivery side, the twist is promoted on the delivery side by reversal of the rotation direction of the twisting device 6.
[0021]
Further, when the distance L ₂ between the twisting device 6 and the guide roller 7 is increased, the number of twists per 1 m in the portion tends to be reduced, and FIGS. 4A, 4B, and 4C show this. Is shown.
[0022]
The calculation results shown in FIGS. 3 and 4 are based on the assumption that twisting is completely prevented at the positions of the feed roller 5 and the guide roller 7 and the rotation of the twisting device 6 is instantaneously stopped. The result shows that the actual number of twists is lower than the above calculation result, but the conventional method (corresponding to (a) in FIG. 3) has a limit of feasible twists of up to 2000 times / m. According to the method of the present invention, it is possible to produce a yarn twisted alternately at a twist number of about 4000 times / m at a practical production rate.
[0023]
FIG. 5 shows a second embodiment of the present invention. The arrangement of the bobbin 2, the yarn guide 4, the feed roller 5, the guide roller 7, the delivery roller 8 and the take-up bobbin 9 is the same as that of the first embodiment, but there are two between the feed roller 5 and the guide roller 7. Twisting devices 6a and 6b are arranged in series. The yarn 1 is inserted through the two twisting devices 6a and 6b in order. The two twisting devices 6a and 6b simultaneously rotate forward and backward in the same direction, but rotate the yarn 6a on the upstream side in the running direction of the yarn faster (for example, at twice the speed) than the one 6b on the downstream side. Thereby, the alternating twist stronger than the method of 1st Example which provided only one twist apparatus can be provided to the thread | yarn 1.
[0024]
The alternate twisted yarn obtained by the present invention alternately includes regions twisted in opposite directions and untwisted regions at predetermined intervals (yarn speed × rotation time of the twisting device) along the longitudinal direction of the yarn. Therefore, a fabric knitted and woven using alternating twisted yarns has a variety of polymerized states (for example, the upper yarn is overlapped in the S twist region and the lower yarn is overlapped in the non-twisted region or the Z twist region). It is possible to generate irregular fringes and easily manufacture soccer grounds, wrinkled grounds, and the like.
[0025]
And according to the method of the present invention, a strong twist can be imparted to the yarn in the alternating direction, and it becomes possible to manufacture with a device that does not include a friction resistor or heater for preventing twist back, There exists an effect that the more suitable thread | yarn for manufacturing a soccer ground and a wrinkle processed place can be efficiently manufactured with an inexpensive apparatus.
[Brief description of the drawings]
FIG. 1 is a side view schematically showing an example of an apparatus for carrying out the method of the present invention. FIG. 2 is an enlarged cross-sectional view of an essential part showing an embodiment of a twisting apparatus of the present invention. FIG. 4 is a diagram showing the change in the number of twists of the alternating twisted yarn obtained by the method of the present invention. FIG. 4 is a diagram showing the change in the number of twists of the alternating twisted yarn obtained by the method of the present invention. Side view schematically showing a second example of the above [Explanation of symbols]
1 Raw yarn 2 Feeding bobbins 6, 6a, 6b Twisting device
21 Cylindrical body
22 spindle
23 V groove
24 ditch wheel

Claims (2)

The raw yarn (1) is continuously pulled out from the feeding bobbin (2), and the drawn raw yarn (1) is inserted through a twisting device (6, 6a, 6b) that repeats forward rotation and reverse rotation at predetermined time intervals. In the method for producing an alternating twisted yarn in which the yarn fed from the twisting device (6, 6a, 6b) is wound around the winding bobbin (9) ,
In the cylinder of the cylinder (21) that is driven to rotate around the central axis, a groove (23) is provided for threading around the center of the support shaft (22) mounted so as to be inclined in the axial direction from the diameter direction. Using the twisting device
Alternately, the yarn is inserted into the cylindrical body of the twisting device in a state of being wound so as to be pulled out obliquely from the groove so that the entering yarn and the fed yarn do not come into contact with each other. A method for producing twisted yarn. A support shaft (22) is installed in the cylinder of the cylindrical body (21) that is rotationally driven around the central axis so as to be inclined in the axial direction from the diametrical direction, and a groove (23 ), And the support shaft (22) is arranged so that the drawn-out end of the thread wound around the groove of the groove is on the central axis of the cylindrical body. The twisting device is characterized in that the twisting device is deviated from the center of the cylindrical body by an amount substantially equal to the radius of the grooved wheel .

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