JPS6354809B2 - - Google Patents

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 installed on the drive side of the front roller, and the switch is turned ON and OFF repeatedly by a signal from an endless tape, that is, the front roller is momentarily stopped to form a 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, this method has the problem that the clutch surface wears out over a long period of use, causing the stop time to gradually vary.As a result, the length and spacing of the resulting yarn slabs also gradually vary. There is a problem.

Another method is to arrange a transmission in the transmission system of the front roller and back roller to change the draft magnification.
Since this method uses a transmission, it is impossible to achieve rapid variations in unevenness, and only very long periods of unevenness can be expected. The disadvantage is that it requires modification of the entire transmission system, resulting in 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,
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 for driving said at least one roller system by a variable speed motor and a rotation speed of said variable speed motor are controlled. The present invention is characterized in that it includes a control device and an output device that outputs control data to the control device, and is configured to change the draft ratio based on the control data to impart thickness unevenness to the spun yarn. be.

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

Figure 1 shows the front roller 1 of a normal spinning machine equipped with a roller draft section, a rolling section, etc.
This figure shows the structure of an example of the special spun yarn manufacturing apparatus of the present invention, which is constructed so that only the spun yarn is driven independently by a variable speed motor 4.

In the figure, the spindle 8 is driven by a drive shaft 9 by the rotation of the main motor 7, as is well known.
Then, the chimney pulley 2 is rotated, and the spindle 8 is rotated via the belt. Further, the back roller 10 and middle roller 11 of the draft section 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 timing pulleys 2 and 3 and a timing belt. Of course, the transmission system in this case may be something other than belt transmission, such as gears or chain transmission.

The variable speed motor 4 is preferably a servo motor, and 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.

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

Therefore, according to the spun yarn manufacturing apparatus having such a configuration, the rotational 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 revolutions of the roller 1, the draft ratio determined by the back roller 10 and the middle roller 11, which are rotating at a constant rate, changes, and it is possible to impart thick and thin unevenness to the spun yarn to be spun. be.

More specifically, for example, the control device 5
The speed command voltage of is DC (direct current) ±6V (volt), the maximum rotation speed of servo motor 4 is 3250RPM,
When the reduction ratio from the servo motor 4 to the front roller 1 is 1/10, and when the output voltage from the computer 6 is 0, the rotation speed of the front roller 1 is
When the output voltage is +6V at 0 RPM, the rotation speed of the front roller 1 is 325 RPM, and the rotation speed of the front roller 1 can be controlled within this range. If it is desired to select a wider range of rotational speeds as desired, the speed reduction ratio itself may be changed.

FIG. 2 shows the computer 6 under the above conditions.
This is an example diagram illustrating the relationship between the output voltage and the actual thread thickness, in which A is a time chart of the output voltage, and B is a diagram showing the relationship between the time and the thread thickness.

In Fig. 2 A, spinning is started with an output voltage of 3V, then reduced to 0V after time t ₁ second, and returned to the original 3V after time t ₂ seconds.
Return to Next, in the case of a time chart that increases to 1.5V after time t ₃ seconds and returns to the original 3V after time t ₄ seconds,
As shown in Figure 2 (b), the thickness of the spun yarn increases rapidly after time t ₁ because the draft magnification becomes 0x, and the thickness of the yarn is calculated from the time t ₂ and the middle roller. The length of the thick yarn portion is equal to the fiber length L 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 forms a thick lump.

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 calculating the fiber length L from the product of front roller speed _Vf3 at an output voltage of 3V and time _t3 . This is the value after subtracting the value.

During the next output voltage of 1.5V and time _t4 , the number of revolutions of the front roller 1 will be half of that of the output voltage of 3V, and the thickness of the thread will be twice that of the output voltage of 3V, but in this case, The thickness does not suddenly double, but gradually doubles over the length of the fiber length L.
After time t ₄ seconds, the same fiber length L is required as described above to return to the yarn thickness at the output voltage of 3V,
The length of the thick yarn portion at this time is the product of the surface speed V _f4 of the front roller 1 at an output voltage of 1.5 V and the time t ₄ plus the fiber length L.

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 explained 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 a smooth thickness unevenness by changing the output voltage in a stepwise manner. By selecting the voltage to be higher than the output voltage of the normal part (normal time), it is also possible to provide a thin thread part. Furthermore, by combining these, special filaments having various unevenness patterns can be obtained.

Moreover, 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 or silk is passed through a yarn unevenness tester, and the electrical analog signal generated by the yarn unevenness is converted into a digital signal by the yarn unevenness tester. After converting the data and storing it in a computer, converting the stored data so that the yarn has the same unevenness as this, inputting it into the control device of the present invention, and spinning it using the cotton spinning method, it is possible to create a natural yarn. It is possible to obtain spun yarn with the unique uneven pattern of long fiber spun yarn (long spun yarn) such as hemp or silk using the cotton spinning method (short spun yarn), which could not be obtained conventionally. It becomes like this.

Above, the case of the device configuration in which the front roller 1 is independently driven by the servo motor 4 has been described, but in the special spun yarn manufacturing device of the present invention,
The back crawler 10 may be configured to be driven independently. Although such a device configuration is not suitable for obtaining short-period unevenness patterns, it is suitable for obtaining long-period unevenness patterns, and has the characteristic that it can obtain a pattern with little variation in 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, it is possible to obtain a more complicated yarn uneven pattern, and also to It can also be controlled to an appropriate number of twists. 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 less effective, and when the middle roller 11 is also driven by a variable speed motor, the back roller 10 and the middle roller are It is preferable that this configuration is made of 11 two-way combinations.

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

Furthermore, in the apparatus 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 feedback is provided to the above-mentioned control device. It is also possible to stop the roller system drive mechanism and to correct the average number when the rotational speed changes due to load fluctuations.

Although the present invention has been described above using the diagram of a ring spinning machine, the present invention is also applicable to various spinning methods such as roller draft 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 computer's random number generation function, and in this case, it is possible to randomly generate the cycle of the thick/thin ratio and thickness unevenness, creating a natural sense of unevenness without periodicity. 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 (long spun yarns) such as natural hemp and silk can be detected by subjecting the yarns to a yarn unevenness tester and using the yarn unevenness data obtained through a computer to control the unevenness. By inputting , it is possible to obtain a spun yarn having a similar unevenness pattern even with short spun yarn.

(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 apparatus of the present invention is configured with a back roller and, if necessary, a middle roller.

[Brief explanation of the drawing]

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. 1
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, where A is the time chart of the output voltage and B is the time chart at that time. It expresses the relationship between time and thread thickness. 1: Front roller, 4: Servo motor which is a variable speed motor, 5: Control device, 6: Computer, 7: Main motor, 8: Spindle, 10:
Cross roller, 11: Middle roller, 12: Transmission system.

Claims (1)

[Claims] 1. A drive device for driving at least one roller system of a front roller system or a back roller system of a spinning machine by a variable speed motor, and controlling the rotation speed of the variable speed motor. and an output device that outputs control data to the control device, and the draft ratio is changed based on the control data to impart thickness unevenness to the spun yarn. Spun yarn manufacturing equipment.