JPS62110926A - Production apparatus for special spun yarn - Google Patents

Abstract

PURPOSE:To apply arbitrary unevenness of denier to a spun yarn along its length, by driving a front roller or a back roller with a variable speed motor and changing the draft ratio using control data outputted to a device for controlling the rotational speed of the motor. CONSTITUTION:The rotational speed of a servo motor 4 is arbitrarily controlled by an electrical analog signal transmitted from an output device 6 (furnished with a digital-analog converter) outputting control data to a control device 5. The rotational speed of a front roller 1 is controlled by this procedure to change the draft ratio between the front roller 1 and a set of a back roller 10 and middle roller 11 which are rotated at constant speed and to impart the spun yarn with denier unevenness.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides continuous thickness unevenness in the length direction of spun yarn, and can freely produce, for example, slub yarn or special spun yarn with long-period unevenness. The present invention relates to a spun yarn manufacturing apparatus that enables manufacturing of spun yarn.

[Prior art] Conventionally, as a slab yarn manufacturing device, an electromagnetic clutch is provided on the drive side of the Freon 1 to roller, and the switch is repeatedly turned on and off by a signal from an endless tape, that is, the front roller is momentarily stopped to move the slab. However, with this device, the size of the slab can only be selected by selecting several types of stopping time, and there is a problem that periodicity tends to appear in the spacing between the slabs depending on the weaving width. . Furthermore, with this method, there is a problem that the clutch surface wears out over a long period of time and the stopping time gradually changes.Therefore, the length and spacing of the slabs of 1q yarn also gradually change. There is.

Another method is to place a transmission in the transmission system of the front roller and back roller and change the magnification from the driver 71, but this method uses a transmission and therefore suddenly changes the magnification. It is impossible to realize a change in unevenness, and only a very long period of unevenness can be expected.In addition, in terms of equipment, in order to incorporate a transmission into the currently narrow spinning machine gearbox, the entire transmission system must be modified. The disadvantage is that it requires high modification costs.

[Problems to be Solved by the Invention] The purpose of the present invention is to solve the above-mentioned problems and obtain a special spun yarn that has thickness unevenness that can be freely varied from short cycles to long cycles in the length direction of the spun yarn. It is an object of the present invention to provide a spun yarn manufacturing apparatus that enables this.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the special spun yarn manufacturing apparatus of the present invention has the following configuration.

That is, the special spun yarn manufacturing apparatus of the present invention has a variable speed motor that drives at least one roller system of a front roller system or a back roller system of a spinning machine. a drive device for tightening the motor; a control device for controlling the rotation speed of the variable speed motor;
The present invention is characterized in that the control device is provided with an output device for outputting control data, and the draft ratio is changed and tightened based on the control data to impart thickness unevenness to the spun yarn.

[Operations and Examples] Hereinafter, the special spun yarn manufacturing apparatus of the present invention will be described in detail based on one example shown in the drawings.

FIG. 1 shows the production of special spun yarn of the present invention in which only the front roller 1 is driven independently by a variable speed motor 4 in a normal spinning machine equipped with a roller draft section, a winding section, etc. The structure of one example of the device is shown.

In the figure, a drive shaft 9 and a chin pulley 2 are rotated by the rotation of a main motor 7, as is well known, and the spindle 8 is rotated via a belt. Further, the back roller 10 and middle roller 11 of the trough 1 to 1 are rotated by a gear transmission system 12 from a drive shaft 9.

On the other hand, the front roller 1 is separated from the gear transmission system 12 and is driven independently from the main motor 7 by a variable speed motor 4 via a timing pulley 2.3 and a timing belt. Of course, the transmission system in this case is
It may be driven by something other than belt transmission, such as gear or chain transmission.

The variable speed motor 4 is preferably composed of a servo motor,
It is connected to a control device 5 that performs highly accurate control using electrical signals. Further, the servo motor 4 is equipped with a tachometer generator which is a feedback device for detecting and correcting the actual rotation speed relative to the command value.

The electrical signals to the control device 5 are connected to be input by a computer 6 equipped with a digital to analog signal converter.

Therefore, according to the spun yarn manufacturing apparatus having such a configuration, the rotation speed of the servo motor 4 is appropriately changed by an electrical analog signal from the computer 6, which is an output device that outputs control data to the control device 5. By changing the number of rotations of the spinneret 1, the draft ratio determined by the back roller 10 and the middle roller 11, which are rotating at a constant rate, changes, thereby making it possible to impart thick and thin unevenness to the spun yarn to be spun. It is.

More specifically, for example, the speed command voltage of the control device 5 is DC (direct current) ±6 V (volt), the maximum rotation speed of the servo motor 4 is 3250 RPH, and the servo motor 4 decelerates the front roller 1. When the ratio is 1/10, when the output voltage from the computer 6 is O, the rotation speed of the front row 51 is ORPM, and when the output voltage is +6V, the rotation speed of the front roller 1 is 325 RP)I, and within this range This means that the rotation speed of the front roller 1 can be controlled within the range. If it is desired to select a wide range of rotational speeds as desired, the speed reduction ratio itself can be changed by means such as changing it.

FIG. 2 is an example diagram illustrating the relationship between the output voltage from the computer 6 and the actual thread thickness under the above conditions, in which (a) is a time chart of the output voltage, and (b) is a time chart of the output voltage at that time. It expresses the relationship between the time and the thickness of the thread.

In Fig. 2 (a), spinning is started with an output voltage of 3■,
After a time of 11 seconds, the voltage is set to O■, and after a time of 12 seconds, the voltage is returned to the original 3V. Next, in the case of a time chart in which the voltage is set to 1.5V after 13 seconds and returned to the original 3V after time t4 seconds, the thickness of the yarn to be spun will be changed after time t1, as shown in Figure 2 (b). becomes thick suddenly because the draft magnification becomes 0 times, and the thickness of the yarn is calculated as the product of the time t2 and the thickness per unit time of the fleece fed from the middle roller, and the thickness of the thick yarn portion is The length is equal to lA11N length of the fiber used regardless of time t2. However, in reality, the fleece is deposited in a bent state near the nip point of the front roller 1, so that the tip of the thread becomes thick and lumpy.

Next, during time t3, the yarn thickness returns to the original thickness at the start of spinning, and the length of that part is calculated by subtracting the fiber length from the product of front roller speed Vf3 at output voltage 3 and time t3. It is a value.

During the next output voltage of 1.5V and time t4, the rotation speed of the front roller 1 becomes half of that of the output voltage of 3V,
The thickness of the thread will be twice when the output voltage is 3V, but in this case,
The thickness does not suddenly double, but gradually doubles over the length of the fiber. After a time of 14 seconds, the length of the fiber is increased in the same way as described above, and the thickness of the yarn returns to that at the output voltage of 3.
The length is the product of the surface speed Vf4 of the front roller 1 at the time and the time t4 plus the fiber length.

Note that the above explanation is based on calculations and may differ slightly from this in reality, but in any case, the above explanation can be approximated.

Above, we have described an example in which a thick thread portion is appropriately added to a thread-like body of normal thickness, but it is of course possible to add smooth thickness unevenness by changing the output voltage in a stepwise manner. Further, by selecting the output voltage to be higher than the output voltage of the normal portion (normal time), it is also possible to provide a thin thread portion. Furthermore, by combining these, special filaments having various unevenness patterns can be obtained.

Further, by randomly generating the output voltage V and the time t within a certain range by a computer, it is also possible to obtain a special filamentous body having an uneven pattern with substantially no periodicity.

In addition, by storing data such as the rate of change in thickness corresponding to the length direction of the yarn in the storage device in advance as control data, it is possible to freely obtain a special filament having a desired thickness unevenness. .

Furthermore, long fiber spun yarn (long spun yarn) such as natural hemp and silk
The yarn is passed through a yarn unevenness tester, and the electric analog signal generated by the yarn unevenness from the yarn unevenness tester is converted into a digital signal and stored in a computer, so that the yarn has the same yarn unevenness. After converting the stored data, inputting it into the control device of the present invention and spinning using the cotton spinning method, the unique uneven pattern of long fiber spun yarns such as natural hemp and silk can be obtained. It becomes possible to obtain a spun yarn having the following properties using a cotton spinning method (short spinning), which has not been possible in the past.

The case where the apparatus configuration is such that the front roller 1 is independently driven by the servo motor 4 has been described above, but in the special spun yarn manufacturing apparatus of the present invention, the back roller 10 may be configured to be independently driven. It is something. In the case of such a device configuration, it is not suitable for obtaining a short period unevenness pattern, but it is suitable for obtaining a long period unevenness pattern, and it has the characteristic that it can obtain one with little fluctuation in the twist coefficient. The specific device configuration may be determined as appropriate in consideration of this and as desired.

Furthermore, in the present invention, both the front roller 11 and the back roller 10 may be configured to be driven by a servo motor, which is a variable speed motor. In this case, a more complicated yarn uneven pattern can be obtained, and the thickness can be reduced. You can also control the number of twists to suit your needs. In addition,
It is also possible to consider a device configuration in which the middle roller 11 is driven independently by a variable speed motor, but in this case it is not very effective, and when the middle roller 11 is also driven by a variable speed motor, the back roller 10 and the middle roller 1
It is preferable that the configuration is made of a combination of the two.

The servo motor used in the present invention is preferably a print motor or coreless motor that has little inertia.

Furthermore, in the device of the present invention, the rotational conditions such as the number of rotations and rotational speed of the main drive motor are constantly detected and fed back to the aforementioned control device.
: It also stops the roller system drive mechanism of the device of the present invention when starting or stopping a spinning machine, and also corrects the average count when the rotation speed changes due to load fluctuations.
: It can be done.

Although the present invention has been described above with reference to the drawings of a ring spinning machine, the present invention is also applicable to various spinning methods such as roller trut type open-end spinning and bundle spinning.

[Effects of the present invention] Below, the effects of the special spinning machine of the present invention are listed.

(1) If the front roller is configured to be directly driven by a servo motor with a fast response speed, it is possible to provide various thickness unevenness patterns from short cycle thickness unevenness to long cycle thickness unevenness, and It is possible to easily and freely design a pattern with uneven thickness.

(2) Various thickness unevenness patterns can be recorded on a desk or tape recorder and taken out as needed, making it easy to switch between a wide variety of products.

(3) It is possible to use the random number generation function of a computer, and in this case, it is possible to randomly generate the cycle of the thickness unevenness and the thickness ratio, so that there is no periodicity and a natural unevenness is created. It becomes possible to produce special spun yarns that are difficult to obtain in the past.

(4) The complex and unique unevenness patterns of long fiber spun yarns such as natural hemp and silk (sun-spun yarns) can be detected by subjecting the yarns to a yarn unevenness tester and using the yarn unevenness data obtained through a computer control device. By inputting the following information, it is possible to obtain a spun yarn having a similar unevenness pattern even when the short yarn is spun.

(5) In one embodiment of the present invention shown in FIG.
Since only the front roller is directly driven by a servo motor, it can be installed on a conventional spinning machine at a low modification cost. This is the same even when the device of the present invention is configured with a back roller and, if necessary, a middle roller.

[Brief explanation of drawings]

FIG. 1 shows an apparatus for manufacturing special spun yarn of the present invention, which is configured so that only the front roller is independently driven by a variable speed motor in a normal spinning machine equipped with a roller draft section, a winding section, etc. This is an example. Figure 2 is an example diagram illustrating the relationship between the output voltage from the computer and the actual thread thickness under the conditions explained in the main text, and (a) is a time chart of the output voltage.
~ and (b) represent the relationship between the time and the thickness of the thread. 1: Front roller 4: Servo motor which is a variable speed motor 5: Control device 6: Computer 7: Main Tanabata 8 Nissin spindle 10: Back roller 11
: Middle roller 12: Transmission system

Claims (5)

[Claims] (1) For a roller system drive mechanism of at least one of a front roller system or a back roller system of a spinning machine, a drive device that drives said at least one roller system by a variable speed motor, and a rotation speed of said variable speed motor. A control device for controlling the yarn and an output device for outputting control data to the control device are provided, and the draft ratio is changed based on the control data to impart thickness unevenness to the spun yarn. Special spun yarn manufacturing equipment. (2) The special spun yarn manufacturing apparatus according to claim (1), further comprising a storage device for storing control data. (3) The special spun yarn manufacturing apparatus according to claim (1) or (2), wherein the variable speed motor is constituted by a servo motor provided with a feedback device. (4) Claims (1), (2) or (3) The special spun yarn manufacturing apparatus described in item (3). (5) The special spinning according to claim (2), wherein the control data is stored in a storage device, and the data is input to the control device at the time of spinning. Yarn manufacturing equipment.