JPH0655975B2 - Overfeed method for heat setting device in double twisting machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method of overfeeding a heat setting device in a double twisting machine, and more specifically, when feeding a twisted yarn to a heat setting device. The present invention relates to an overfeed method in which a yarn is intermittently brought into contact with the peripheral surface of a feed roller a plurality of times to feed the yarn to a heat setting device with an arbitrary tension according to the type and fineness of the yarn.

(Prior Art and Problems Thereof) The applicant of the present invention discloses a double-twisted yarn in which heat is immediately applied to a yarn twisted by a heating device incorporated in a double-twisting machine in JP-A-60-162821 to stop the twisting. An on-board heat setting method was proposed. In this method, the package wound by the double twisting machine up to that point is omitted in order to perform twisting, and the thing which has been through the batch type team process of another process is omitted, which can contribute to the rationalization of process shortening and twisting. There was an effect that an extremely stable yarn was obtained in terms of quality of the produced yarn.

However, a new problem has occurred when heat-setting onboard the machine by this method. The problem is the problem of tension control applied to the yarn during heat setting.

In general, when heat setting a yarn, the physical properties of the obtained yarn are extremely sensitive to the heating temperature and the tension applied to the yarn at that time depending on the type and fineness of the yarn. Detailed control of the temperature of the heating device for heat setting and the tension conditions of the yarn is required. However, in the conventional double twisting machine, temperature control can be appropriately controlled according to the type and fineness of the yarn, but there is a major limitation in terms of tension control. That is, to explain this in detail, in the conventional double twisting machine, when the twisted yarn is wound by the winding device, the yarn passing through the balloon guide is rotated at a peripheral speed higher than the winding speed. When the friction roller comes into frictional contact with the surface of the feeding roller, so-called overfeeding occurs while the yarn is slipping on this friction surface, and the high tension of the yarn caused by the balloon generated by the rotation of the double twist yarn spindle is reduced. Then, it is wound on the winding device. In this way, the take-up device of the double-twisting machine uses a slip-type over-feed method that does not use the over-feed method using a nip roller in the winding device, but uses the contact of the circumferential surface of the feed roller. The method of winding the yarn by the surface friction force between the yarn and the package is adopted, and the yarn is wound as a package on the take-up tube while traversing by the traverse guide. There is a slight speed difference between the center and both ends of the package due to this traversing motion. Therefore, in the slip method of frictionally contacting the peripheral surface of the overfeed roller, this speed difference is covered by slip. Therefore, there is an advantage that winding can be performed without changing the yarn tension between the overfeed roller and the winding device. If the overfeed method using the nip roller method does not occur, tension fluctuations will occur and this will adversely affect the winding shape and yarn quality of the winding package. However, with the conventional slip-type overfeed method of frictionally contacting the circumferential surface of the feed roller, the winding tension applied to the yarn can be reduced to only about 0.1 g / d, no matter how much the overfeed ratio is increased. No control of tension was possible at all. The reason is that when the yarn is brought into contact with the circumferential surface of the conventional feed roller, the winding angle is limited. Here, the winding angle means the angle formed by the center of the feed roller from the point where the yarn starts to contact the circumferential surface of the feed roller to the point where it separates. To reduce the winding tension, increase this winding angle. It is good to let

However, if the winding angle is increased, the winding starts when the machine is started, and the yarn winds around the feed roller, making it impossible to wind. However, when performing on-machine heat setting with a double twisting machine, low tension of about 0.05 g / d has recently been required due to the requirement for low shrinkage yarn, but as described above, it is a conventional overfeed method. The yarn tension is up to 0.1 g / d. If the tension is less than 0.1 g / d, the yarn is wound around the feed roller and cannot be wound up.

(Purpose) Therefore, the present invention is intended to solve the above-mentioned drawbacks, and it is an object of the present invention to utilize the advantages of the slip-type overfeed method while sending a twisted yarn to a heat setting device. In order to obtain a heat-set yarn with the above-mentioned physical properties, it is intended to provide an overfeed method for a heat-setting device incorporated in a double twisting machine, which can give an optimum tension according to the type and fineness of the yarn.

(Structure) The present invention takes the following means in order to achieve the above object.

When the yarn twisted by the double twisting spindle is brought into contact with the surface of an overfeed roller that rotates at a peripheral speed higher than the winding speed, the yarn is sent to a heating device for heat setting. A twisted yarn is wound between a roller and a guide roller which is arranged with an appropriate gap from the overfeed roller, and the yarn is intermittently provided on the peripheral surface of the overfeed roller. It is characterized in that it is brought into contact with the heating device a plurality of times and compared with the overfeed roller entrance tension of the running yarn by the frictional resistance, and the exit tension is gradually reduced and sent out to the heating device.

(Function) An example of a double twisting machine equipped with a device for carrying out the method of the present invention will be specifically described with reference to the drawings. In FIGS. 1 and 2, 1 is a double twisting spindle, 2 is a balloon guide, 3 is an overfeed roller whose peripheral speed rotates at a speed faster than the winding speed. The overfeed roller has a plurality of grooves (2 in FIG. 2) along which the yarn Y runs on its circumferential surface.
(Showing the case where there are three grooves 3a3b),
It is attached to the drive shaft 4.

Reference numeral 5 is a first guide roller for guiding the yarn Y to intermittently contact the overfeed roller.
The guide roller is rotatably supported by a bracket 7 fixed to the machine frame 6 with an appropriate distance from the overfeed roller 3. Reference numeral 8 is a second guide roller for adjusting the contact angle of the yarn Y with respect to the circumferential surface of the overfeed roller 3 by the change of the position, and the guide roller is an elongated hole 7a formed in the bracket 7. Installed on. Reference numerals 9 and 11 are guide rollers for guiding the yarn to a heating device 10 for twisting the twisted yarn Y, and 12 is a guide for maintaining a constant angle at which the yarn Y is introduced into the winding device. The guide rod is fixed to the machine frame 6 with a rod. 13
Is a traverse guide, 14 is a winding drum, 15 is a winding tube, and 16 is a package.

An example of the double twisting machine equipped with the apparatus for carrying out the method of the present invention is constructed as described above. Next, the traveling route of the yarn will be described with reference to FIGS. 1 and 2. The yarn Y twisted by the twisting spindle 1 passes through the balloon guide 2 and comes into contact with the first groove 3a on the circumferential surface of the overfeed roller 3, and then the first guide roller 5 is wound.
After coming into contact with the second groove 3b on the circumferential surface of the overfeed roller again, it is guided by the guide roller 9 to the heating device 10 via the second guide roller 8. Here, the yarn is heated and untwisted, and then wound around a winding tube 15 pressed against a winding drum 14 while being traversed by a traverse guide 13 via a guide roller 11 and a fixed guide 12. Formed as a package 16.

By the way, now the overfeed roller 3 and the guide roller 5,
The running state of the yarn of No. 8 will be described in more detail with reference to FIG. 2. First, when the traveling yarn Y passing through the balloon guide 2 comes into contact with the first groove 3a of the overfeed roller 3, the circle of the overfeed roller 3 is circled. Since the speed of the peripheral surface is faster than the yarn running speed, the yarn Y receives the overfeed and the outlet tension becomes smaller than the inlet tension.

Then, the yarn Y passes through the guide roller 5 and again comes into contact with the second groove 3b of the overfeed roller. Here too, the peripheral speed of the overfeed roller 3 is faster than the speed of the running yarn, so that the yarn receives the overfeed and the outlet tension becomes smaller than the inlet tension.

For this reason, the exit tension from the final second groove 3b is significantly smaller than the exit tension from the first first groove 3a. Since the running tension of the yarn can be gradually reduced in this manner, the yarn is wound around the overfeed roller 3 as compared with the conventional case where the running tension of the yarn is reduced by only one contact. Instead, it is possible to reduce the tension of the yarn.

Further, since the second guide roller 8 is attached to the elongated hole 7a of the bracket 7 so that its position can be changed, the wrapping angle which comes into contact with the circumferential surface of the overfeed roller 3b is determined by the second guide roller 8. Since it can be freely changed by adjusting the roller 8, the final exit tension of the overfeed roller can be adjusted correspondingly.

(Example) Twisting and winding were carried out under the following conditions using an overfeed device having a grooved overfeed roller as shown in FIG. 2, and the results are summarized in Table 1. Here for comparison,
Although the case of the conventional example is also listed, this conventional example is a case where the yarn simply contacts the overfeed roller once. Also,
When the overfeed roller of the present invention is wound three times, the overfeed roller 3 has three grooves, and in this case, the second guide roller 5 is additionally provided.

Setting conditions of double twisting machine ・ Supply yarn: Polyester stretched yarn 75d / 36f ・ Twisting number: 2500T / m ・ Spindle speed: 12000rpm ・ Overfeed roller contact part outer diameter: 60mm ・ Overfeed ratio (overfeed) Roller peripheral speed / winding drum peripheral speed) 1.12 As is apparent from Table 1, when the yarn is intermittently contacted with the overfeed roller according to the present invention a plurality of times, the final exit tension after passing through the overfeed (though this tension is the tension to be sent to the heat setting device) Can be made as small as 0.05 g / d or less.

Further, in FIG. 3, the total winding angle of the winding angles when the yarn comes in contact with the circumferential surface of the overfeed roller a plurality of times intermittently is shown on the horizontal axis, while the vertical axis shows the overfeed angle. It is a graph showing the relationship between the two when the final outlet tension after passing is taken. In this case, the yarn winding angle of 240 ° or more indicates a region where the yarn comes into contact with the overfeed roller a plurality of times. (Note that the region above 240 ° and below 360 ° is the region where the yarn is wound around the overfeed roller and cannot be wound when the machine base is started if it is only once contacted with the overfeed roller.) Here, since the yarn tension curve with respect to the wrapping angle of the overfeed roller is intermittently in contact with the circumferential surface of the overfeed roller, the position of the guide roller is originally fixed. Since the wrapping angle is determined, it becomes a discontinuous curve.

However, since the position of the second guide roller 8 can be freely changed, the winding angle of this discontinuous portion changes depending on the position of the second guide roller, and as a result, a continuous curve can be obtained. Therefore, it can be seen from this graph that when the yarn is brought into contact with the overfeed roller a plurality of times, the feeding tension to the heat setting device can be arbitrarily selected even if it is as small as 0.05 g / d or less. I understand.

(Effect) As described above, according to the present invention, the twisted yarn is wound between the overfeed roller and the guide roller arranged with the overfeed roller at an appropriate interval. Since the yarn makes contact with the circumferential surface of the overfeed roller a plurality of times intermittently, the tension of the running yarn is gradually increased by the intermittent contact with the overfeed roller as compared with the conventional method. It can be sent to the heat-setting device by making it small, and therefore, tension control can be performed in an optimal state according to the type and fineness of the yarn, and the yarn caused by the rotation delay of the take-up tube when the machine stand is started. Since the looseness of the yarn can be dispersed and absorbed between the overfeed roller and the guide roller, the yarn is not wound around the outer surface of the overfeed roller. Tension is 0.05g /
Since it is possible to control a low tension of d or less, an effect that can be sufficiently applied even in a normal double twisting machine without a heating device even in the case of soft winding having a very small package winding hardness.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a double twisting machine equipped with an overfeed device for carrying out the method of the present invention, FIG. 2 is a perspective view of an essential part of FIG. 1, and FIG. 3 is a yarn overfeed roller winding. It is a graph which shows the relation between the attachment angle and the final exit tension of the overfeed roller. 1 ... Double twist yarn spindle 3 ... Overfeed roller 5,8 ... Guide roller, 10 ... Heating device 15 ... Winding tube, 16 ... Package

Claims (2)

[Claims] 1. A yarn twisted by a double twisting spindle is brought into contact with the surface of an overfeed roller rotating at a peripheral speed higher than a winding speed, and then sent to a heating device for heat setting. At this time, the twisted yarn is wound between the overfeed roller and the guide roller arranged with an appropriate interval from the overfeed roller, and the yarn is removed from the overfeed roller. It is characterized in that it is brought into contact with the peripheral surface several times intermittently, and its frictional resistance is compared with the inlet tension of the overfeed roller of the running yarn, and the outlet tension is gradually reduced and sent out to the heating device. Overfeed method for heat setting device in double twisting machine. 2. The overfeed roller has a plurality of grooves on which a yarn runs on a circumferential surface thereof.
A method for overfeeding a heat-setting device in a double twisting machine according to the item.