JPS63154588A - Method for winding yarn - Google Patents

Abstract

PURPOSE:To wind a yarn under constant tension by constituting the system wherein the tension of a yarn released from a yarn feed passage is detected, and the tension of the yarn due to a tenser is changed depending upon the result of tension detection, thereby winding the yarn about a yarn take up package. CONSTITUTION:If a signal of yarn tension rise has been outputted from a yarn voltage sensor 7 due to some causes, an instruction for reducing a power supply to an electromagnetic coil 20 is outputted from a control circuit 40 to an oscillator 21, corresponding to an increment in said tension and the tensioning of a yarn Y at a tenser 6 is thereby weakened. On the contrary, if a signal for reducing yarn tension has been outputted from a yarn pressure sensitive sensor 7, an instruction for increasing a power supply to the electromagnetic coil 20 is outputted, corresponding to a decrease in tension, and the tensioning of the yarn Y at the tenser 6 is thereby intensified. As a result, the tension of the yarn Y under winding becomes free from fluctuation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a yarn winding method in a yarn winding machine or the like.

[Conventional technology]

2. Description of the Related Art Conventionally, yarn winding machines are known for winding packages of filament yarns or various processed yarns into pancakes of desired shapes for subsequent processing. In such a yarn winding machine, by winding the yarn, it is possible to change the size of the pancage, change the shape of the package, obtain a composite yarn using two or more yarns as a supply system, etc. is being carried out.

In the above yarn winding machine, the yarn is wound while being traversed by a rotating winding package, and the supply system of the supply package is unraveled by the winding force. A tensioner is usually installed between the supply package and the winding package to apply a constant tension to the running yarn.

[Problem that the invention seeks to solve]

However, in the above-mentioned yarn winding machine, the tension of the yarn to be wound fluctuates, and as a result (1) when winding for a certain period of time, the winding package has a yarn amount different from the desired fixed length winding amount, and the loom When used for warp yarns, the amount of yarn to be discarded increases due to the difference in the amount of yarn. (2) Non-uniform thread density of the wind-up package has caused problems such as poor winding shape of the wind-up package.

The causes of the fluctuation in the tension of the winding yarn mentioned above are that the yarn speed increases as the winding diameter of the winding package increases, and as the winding diameter of the yarn feeding package decreases, the winding of the yarn on the yarn feeding package increases. It is thought that the thread tension increases as the number of threads increases, making it difficult for the thread to unravel, and that the tension of the thread fluctuates due to variations in the processing accuracy of the tensor, thread guide, etc., and variations in the coefficient of friction.

[Means for solving problems]

This invention detects the tension of the yarn unwound from the yarn supply package, changes the force of applying tension to the yarn by a tensor according to the detected tension, and winds the yarn into a winding package. This is what I did.

[Effect]

By the means described above, it is possible to always wind up the yarn with a constant tension.

〔Example〕

FIG. 5 shows the configuration of a yarn winding machine to which the present invention is applied. This winding machine uses a cheese-like yarn feeding package (Pa
) is wound up into a burn-shaped winding package (Pb).

The above yarn feeding package (Pa) is on the package mounting table (1)
The winding-up bathocket (Pb) is mounted on the spindle (2). The spindle (2) is attached to a belt (3) running perpendicularly to the front and back direction of the paper in FIG.
) and can be rotated. Reference numeral (4) denotes a traverser, which moves up and down in the vertical direction by a mechanism (not shown) to traverse the winding yarn (Y) while holding the yarn (Y) with a traverse guide (5) at its tip. (6) is the above 2
A tensor is installed between the two packages (Pa) and (Pb), and (7) is a thread pressure sensor, the configurations of which will be described in detail later. The thread (Y) is passed through the traverser (4) to the winding package (Pa) which is rotating as the belt (3) runs.
), the yarn (Y) is wound up while being traversed, and the yarn (Y) is unraveled from the yarn supply package (Pa) by this winding.

The configurations of the tensioner (6) and yarn pressure sensor (7) will be explained next. As shown in Fig. 1.2, the tensor (6) is a gate tensor body (12) formed by connecting the proximal and distal ends of three roughly U-shaped gate fingers (10) with connecting pieces (11). Arrange two of each to face each other, and place the gate tensor bodies (12a) (12a) on one side.
is a fixed plate) (13) and the plate (13) is fixed to the plate (13).
) on the machine base, and then attach the tensor body (12b) on the other side.
(12b) is fixed to the movable plate (14) and the rotating plate (15) (
15) is fixed. The rotating plate (15) (1
5) is inserted into a shaft (7) whose upper and lower ends are supported by bearings (16) (16), and is rotatable about the shaft (17). Upward turning play) (15
One end of a string (18) is fixed to one end of the string (
A metal disc body (19) is suspended from the other end of 18). An electromagnetic coil (20) is located below the disk body (19).
are provided so that their end surfaces face each other. (21) indicates the oscillator of the coil (20).

As shown in Fig. 1.3, the yarn pressure sensor (7) has a pair of upper and lower fixed pins (30) (31), and a movable pin (32) provided between the fixed pins (30) (31). ), and the three pins (30) (31) (3
2) are installed in a staggered manner, and the movable pins (32) are located in the elongated holes (3).
3) can be moved along.

The movable bin (32) is connected to the core (34),
A primary coil (35) and two
Two secondary coils (36) (37) are provided. The primary coil (35) is connected to an oscillator (38),
The two secondary coils (36) and (37) have exactly the same number of turns, reverse the winding direction left and right, and output to the control circuit (41) via the amplifier (39) and rectifier (40). There is. The running yarn (Y) is attached to the three pins (30) (
31) The movement of the movable pins (32) that are wound around (32) and run in the direction of the arrow (42) due to the tension of the threads (Y), and the movement of the core (34), cause the secondary coil to move. (36) The tension of the thread (Y) is detected by changing the combined generated voltage from (37). That is, in Fig. 1, if the voltage generated by the right secondary coil (36) is (el) and the voltage generated by the left coil (37) is (e2), the combined voltage (1e) of both is 2. Since the coils are differential, e=el-e2. When the core is at the center, the magnetic fluxes given to the two coils are exactly equal, so e-el-e2=0.

However, for example, if the core (34) is moved slightly to the left in FIG. 1, el decreases and e2 increases, so e=el
-e2 becomes unbalanced, and a composite voltage e is gradually generated.

In the yarn winding machine configured as above, the yarn (Y)
is wound up with tension applied to it by a tensioner (6). As shown in FIG.
14) The tension applied to the thread (Y) changes depending on the turning angle. That is, compared to the gate finger (1o) position shown by the solid line, at the gate finger (10a) position shown by the two-dot chain line, the contact surface between the yarn and each gate finger (10) (10a) increases, so that the traveling yarn ( A larger tension is applied to Y).

The rotation angle of the above movable play (14) is the disc body (19)
) is determined by the vertical position of the disk body (19
) is determined by the magnetic attraction force of the electromagnetic coil (20), that is, the amount of electricity flowing through the coil.

Therefore, if a signal indicating an increase in yarn tension is output from the yarn pressure sensor (7) for some reason, the control circuit (40) sends the electromagnetic coil (20) to the oscillator (21) in accordance with the amount of increase in the tension. ) is output a command to reduce the amount of power supplied to
The tensioning force applied to the thread (Y) in the tensor (6) is weakened. Conversely, if the yarn pressure sensor (7) outputs a signal to decrease the yarn tension, a command to increase the amount of power supplied to the electromagnetic coil (20) is output in accordance with the amount of decrease in the tension, and the tensor Strengthen the tensioning force applied to the thread (Y) in (6).

Note that a desired yarn tension value is input in advance to the control circuit (4o) from an input board (not shown) according to the yarn type, winding speed, or winding diameter of the winding package, and the input value and yarn pressure sensor (7) The detected values from the electromagnetic coil (20) may be compared, and the amount of power supplied to the electromagnetic coil (20) may be controlled based on the comparison result. Further, by inputting an input value having a width within a certain range, it may be determined that the desired yarn tension is within the range, and the tension applying force by the tensor (6) may not be changed. In other words, there is some variation in the thread travel distance depending on the position of the traverser (4), and due to this variation, the thread tension also varies in small cycles with each traverse reciprocation.
By making the input value include the traverse variation, minute variations can be ignored.

Note that the present invention may be applied to other types of tensors other than the tensor (6) of the above embodiment, and other types of sensors may be applied to the yarn pressure sensor (7) of the above embodiment. For example, it is also possible to use a pressure sensor that measures the displacement of an object based on changes in the pressure of a thread.

〔Effect of the invention〕

As explained above, according to the present invention, there is no fluctuation in the tension of the yarn being wound, all of the above-mentioned problems are solved, and a high-quality wound package can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing a tensioner and a thread pressure sensor to which the present invention is applied, Fig. 2 is a plan view of the tensioner, Fig. 3 is a perspective view of the thread pressure sensor, and Fig. 4 shows the thread tension due to the tensioner. FIG. 5 is a schematic diagram showing the principle of application, and is a front view showing a yarn winding machine to which the present invention is applied. (6)... Tenser (7) -... Yarn pressure sensor (Pa)... Yarn feeding package (Pb)... Winding package Figure 3 Figure 2

Claims (1)

[Claims] Detects the tension of the yarn unraveled from the yarn supply package,
A yarn winding method characterized in that the yarn is wound into a winding package by changing the tension applied to the yarn by a tensor in accordance with the result of the tension detection.