JP3700446B2 - Ribbon winding prevention method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ribbon winding prevention method and apparatus for an automatic winder and the like.
[0002]
[Prior art]
In an automatic winder, a spinning bobbin produced by a spinning machine is wound around a package rotating on a traverse drum to form a package having a predetermined yarn amount and shape.
[0003]
When the number of rotations of the traverse drum and the package becomes an integral multiple or a fraction of an integer during winding of this package, the traverse cycle and the winding cycle of the package are synchronized, and the wound yarn is the same. As a result, the so-called ribbon winding occurs.
[0004]
In a package in which ribbon winding has occurred in this way, ribbon winding yarns are entangled with each other, and when the package yarn is unwound in a later process, the ribbon winding is unwound at once from the package. End up.
[0005]
Regarding the ribbon winding of this package, if the winding number of the traverse drum is Dw, the drum diameter is Dd, the winding number of the package is Pw, and the package diameter is Pd, the relationship of the following equation (1) is established.
[0006]
Pw = Dw × Dd / Pd (1)
When the drum rotation speed is Nd and the package rotation speed is Np, the package wind number Pw is expressed by the following equation (2).
[0007]
Pw = Dw * Np / Nd (2)
From the above equation (1), when winding the ribbon, assuming that the drum diameter Dd = 98 mm and the drum wind number Dw = 2.5, the package diameters Pd are 81 mm (3 W), 98 mm (2.5 W), 122 mm (2 W), respectively. It occurs at 163 mm (1.5 W) and 245 mm (1 W).
[0008]
Conventionally, in order to prevent this ribbon winding, as proposed by the present inventor in Japanese Examined Patent Publication No. 2-40577, the disturbance control is performed, that is, the rotation of the traverse drum is increased / decreased near the ribbon winding diameter. Ribbon breakage can be achieved by causing slippage between the package and the drum to disperse and wind the traverse yarn path.
[0009]
That is, even if the drum rotation speed (Nd) is increased or decreased, the package rotates at a substantially constant rotation speed (Np) by its inertial force. Therefore, the package wind number (Pw) shown in the above equation (2) is reduced. You can change the ribbon.
[0010]
[Problems to be solved by the invention]
By the way, as described above, when disturb control is performed by increasing / decreasing the drum rotation speed in the vicinity of the ribbon winding generation diameter, the number of winds wound around the package changes finely. Actually, it has been found that a small ribbon winding occurs other than the ribbon generation diameter, and that a new problem arises that the ribbon yarns are entangled with each other when the package is unwound, causing latching and thread breakage.
[0011]
As a result of unraveling many packages for this latching, the number of winds of the package is prominent in the vicinity of 1 W where a large ribbon is formed. With package diameters such as 2 W and 3 W, latching occurs due to disturb control. It turns out that there are few.
[0012]
Accordingly, an object of the present invention is to provide a ribbon winding prevention method and apparatus capable of solving the above-described problems and performing more complete ribbon winding prevention.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is a method for preventing ribbon winding when winding a yarn while rotating the package on a traverse drum. This is a ribbon winding prevention method in which winding is performed without performing disturb control a certain amount before the winding diameter of the ribbon.
[0014]
According to the second aspect of the present invention, from the beginning of winding of the package to before the winding diameter where a large ribbon is formed, winding is performed by disturb control in which the speed increase / decrease ratio of the traverse drum is reduced, and from a certain extent before the winding diameter where a large ribbon is formed Winding without performing disturb control until just before, and then winding with disturb control with an increased speed reduction ratio of the traverse drum from just before the winding diameter where a large ribbon is formed until passing the winding diameter. It is a ribbon winding prevention method of description.
[0015]
According to a third aspect of the present invention, there is provided a ribbon winding prevention device for winding a yarn while rotating a package on a traverse drum, an inverter device for controlling the rotation of the traverse drum, and a winding diameter to which a large ribbon can be formed. The package diameter sensor that detects the diameter of the package from the front and the detection value of the package diameter sensor are input. Control is performed, and disturb control is not performed until just before the winding diameter where a large ribbon is formed, but immediately before the winding diameter where a large ribbon is formed, and disturbance control is performed by increasing the acceleration / deceleration ratio of the traverse drum. To prevent ribbon winding with a logic circuit that outputs a disturb command signal to the inverter device It is the location.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
[0017]
First, the basic configuration of an automatic winder to which the ribbon winding prevention method and apparatus of the present invention is applied will be described with reference to FIG.
[0018]
The unit body 10 is provided with a traverse drum 11, and a cradle 13 that is rotatable around a shaft 12 is provided behind the unit 10. The package P is rotatably held by the cradle 13 and rotated in contact with the traverse drum 11, and the yarn Y from the spinning bobbin is guided by the groove 14 of the traverse drum 11 and wound around the package P while being traversed. It is supposed to be.
[0019]
The traverse drum 11 is connected to a drive motor 16 via a transmission device 15, and the drive motor 16 can be driven by an inverter device 18 so that the number of rotations can be varied.
[0020]
The shaft 12 of the cradle 13 is provided with a package diameter transmission member 19 that rotates together with the cradle 13, and the unit body 10 has a diameter of the package P, particularly the package P, from the rotation position of the package diameter transmission member 19. A package diameter sensor 20 is provided for detecting the diameter of one wind (1 W) from a certain distance, and a detection value of the sensor 20 is input to a programmable logic circuit 21.
[0021]
The inverter device 18 converts the alternating current from the commercial power supply 22 into a direct current once, and converts the direct current into a variable frequency alternating current power supply by ON / OFF control of the transistor.
[0022]
The logic circuit 21 outputs a frequency command signal 23 to the inverter device 18 based on a control program for the rotational speed of the traverse drum 11 from the start to the end of winding of the package P.
[0023]
The control program of the logic circuit 21 performs disturb control with a small acceleration / deceleration ratio of the traverse drum 11 from the beginning of winding of the package P to a certain extent before the winding diameter at which a large ribbon can be formed, and then a large ribbon is formed to some extent before. The disturbance control is performed by increasing the speed reduction ratio of the traverse drum 11 until the traverse drum 11 is rotated at a constant speed without performing the disturb control immediately before the possible winding diameter and then passes through the winding diameter where a large ribbon is formed. To do.
[0024]
FIG. 1 shows an example in which the number of rotations of the traverse drum 11 is controlled to increase / decrease by the logic circuit 21 in response to a change in the number of package winds relative to the package diameter.
[0025]
In this case, the drum wind number Dw of the traverse drum 11 is 2.5 W, the drum diameter Dd is 98 mm, and the package diameter Dp of 1 W (number of package winds) that can form a large ribbon is obtained from the above-described equation (1). 244 mm.
[0026]
Therefore, in the present invention, as shown in FIG. 1, from the start of winding (T0) to the package diameter of 232 mm (Ta), for example, winding is performed with a disturbance control of ± 5%, 2/2 sec, and the package Disturbance control is not performed between 232 and 240 mm in diameter (Tb to Tc) (increase / deceleration 0% = constant speed rotation), and winding is performed while package diameter Dp is 240 to 248 mm (Tc to Td) ± 15% Winding is performed with a large disturbance control of 2/2 sec. From the package diameter Dp of 248 mm (Td) or more to the end of winding, winding is performed with a disturbance control of ± 5%, 2/2 sec or constant speed rotation. This is a package that eliminates ribbon winding more completely.
[0027]
First, the present inventor unwinds the wound package by performing disturb control as in the prior art to some extent before the 1 W package diameter (244 mm, Tr) where a large ribbon is generated, and latching occurs at any package diameter. As a result of an experiment to determine whether the frequency is high, it was found that latching occurred even at a package diameter of 240 mm or less before reaching 1 W. Therefore, when the diameter of the package having a diameter of 230 to 250 mm was further examined, it was found that there was a latching peak at the package diameter of 238 mm.
[0028]
Therefore, in order to obtain this cause, the deviation amount when the disturb control is performed is analyzed, and the results of obtaining the influence of the ribbon winding by the disturb control are shown in FIGS.
[0029]
4 to 6 show the amount of deviation with respect to the number of turns.
[0030]
Here, the shift and the number of turns will be described with reference to FIG.
[0031]
FIG. 3 shows a large-diameter side yarn path wound around the package P at a certain diameter, and the thread path 27 wound in the next turn (traverse swing) with respect to the dotted line thread path 26 is a solid line. If it is wound as shown, corners 26a and 27a are formed on the large-diameter side by turning back the yarn paths 26 and 27, and the circumferential position thereof is set to “deviation”. In this case, with respect to the rotation direction of the corner 26a, the shift for each turn can be analyzed as positive if the corner 27a formed in the next turn shifts in the rotation direction and negative if it shifts in the reverse direction.
[0032]
Therefore, the number of turns is different from the number of turns when a large disturb control is performed by alternately repeating the 3-second deceleration after increasing the acceleration / deceleration ratio ± 15% for 3 seconds with respect to various package diameters of some 1W before. And asked.
[0033]
FIG. 4 shows a wind pattern of deviation with respect to the number of turns when the disturb control is performed from the package diameter of 242 mm, and FIG. 5 shows a wind pattern of deviation with respect to the number of turns when the disturb control is performed from the package diameter of 238 mm. ing.
[0034]
4 and 5, when the deviation is 0 mm, the ribbon winding is generated, and ribbon winding does not occur unless the area of 0 mm is crossed.
[0035]
Therefore, comparing FIG. 4 with FIG. 5, it can be seen that the center of deviation in FIG. 4 is 0 mm and the center of deviation in FIG. 5 is −80 mm.
[0036]
Here, when disturb control is performed from 242 mm immediately before the diameter (244 mm) where the ribbon of 1 W is generated, if disturb control with a small acceleration / deceleration ratio (for example, acceleration / deceleration ratio ± 3%, 3/3 sec) is performed, The winding pattern passes through the center of deviation (0 mm) many times, and the number of ribbon windings in the number of turns becomes large and is not effective. As shown in FIG. 4, large disturbance control of ± 15% is performed. Thus, the number of crossing the deviation of 0 mm can be reduced as much as possible to eliminate the generation of a large ribbon.
[0037]
However, as shown in FIG. 5, when a large disturbance control of ± 15% is performed from the package diameter 238 mm, which is a certain amount before the diameter (244 mm) where the 1 W ribbon is generated, the wind pattern is a pattern that crosses a deviation of 0 mm. It became clear that this was the cause of latching.
[0038]
Accordingly, as shown in FIG. 6, when the drum is rotated at a constant speed without performing disturb control from the package diameter of 238 mm to the package diameter of 240 mm, the deviation is constant at −80 mm, and no ribbon winding occurs at all. It turned out that.
[0039]
In other words, from the package diameter of 238 mm in FIG. 6, it was found that performing ± 15% disturb control causes ribbon winding to occur in reverse, which is wasteful control.
[0040]
However, since a fine ribbon is generated up to a package diameter of 238 mm, which is a certain amount before the winding diameter (244 mm) at which a large ribbon of 1 W is generated from the start of winding of the package, disturb control is necessary.
[0041]
Therefore, the present invention, as shown in FIG. 1, is ± several% from the beginning of winding of the package (T0) to a certain distance (238 mm, Ta) from the diameter (244 mm) where a large ribbon of 1 W is generated. A small disturbance control is performed, and from a certain amount before (Ta) to the previous time (238 to 242 mm, Ta to Tb), the winding of the package and the drum is eliminated by winding at a constant speed without performing the disturbance control. The diameter at which large ribbon winding occurs becomes accurate, and the ribbon winding generation is reduced as much as possible by performing a large disturbance control of 10% or more immediately before (242 mm, Tb) immediately before the diameter at which ribbon winding occurs (244 mm, Tr). Thereafter, after a diameter (250 mm, Tc) at which the “deviation” increases after passing the ribbon winding diameter, a small disturbance control or derating of several percent is performed. Can be a more complete ribbon winding-free package by winding not attempt to starve control.
[0042]
The ribbon winding prevention control of FIG. 1 is programmed in the logic circuit 21 of FIG. 2 by programming a pattern in which the change in the command frequency of the frequency command signal 24 to the inverter device 18 based on the disturb control is a disturb command signal. The control timing is determined by the diameter of the package P detected by the diameter sensor 20.
[0043]
Further, in the above-described embodiment, as an example of performing ± 5% disturb control from the beginning of winding of the package (T0) to a certain amount before the diameter (Ta) where a large ribbon of 1 W is generated, ± 5% Although an example of 2 second speed increase and 2 second speed reduction has been shown, the control is not limited to this value as long as fine ribbon break can be controlled. Disturbance control may be performed by changing. Further, ± 15% as a large disturbance control between the diameter (Tb) immediately before the diameter at which a large ribbon of 1 W is generated and the diameter (Tc) through which the ribbon winding generation diameter (Tr) passes and the "deviation" increases. Although an example in which the speed is increased by 2 seconds and decelerated by 2 seconds has been shown, the present invention is not limited to this value as long as the control can perform a 1 W ribbon break.
[0044]
Although the description has been given mainly with the drum 11 having 2.5 W, it is needless to say that the present invention can be applied to drums having 3 W, 2 W, and 1.5 W. In this case, the package diameter for generating 1 W ribbon winding is 300 mm for the 3 W drum, 200 mm for the 2 W drum, and 150 mm for the 1.5 W drum, assuming that the drum diameter is 100 mm. , Tc change, but the front Ta to some extent with respect to the package diameter (Tr) where a large ribbon of 1 W is generated may be a stable region where the deviation is sufficiently away from “0 mm”, and the immediately preceding Tb is 1 W This is performed when the deviation immediately before the ribbon winding is within 20 mm, for example, and Tc is set when the diameter is in a stable region that does not require disturb control.
[0045]
【The invention's effect】
In short, according to the present invention, by rotating at a constant speed without performing disturb control to some extent before a large ribbon is generated, the ribbon winding generation diameter becomes accurate, and by performing large disturb control immediately before that, Ribbon breaks can be done more effectively and reliably and more complete packages without ribbons can be taken up.
[Brief description of the drawings]
FIG. 1 is a diagram showing disturb control in the package diameter and the number of package winds in preventing ribbon winding in the present invention.
FIG. 2 is a diagram showing an outline of a ribbon winding preventing device in the present invention.
FIG. 3 is a diagram illustrating a yarn path wound around a package in the present invention.
FIG. 4 is a diagram showing the relationship between the number of turns and deviation when winding is performed by performing disturb control with a package diameter of 242 mm.
FIG. 5 is a diagram showing the relationship between the number of turns and deviation when winding is performed by performing disturb control with a package diameter of 238 mm.
FIG. 6 is a diagram showing the relationship between the number of turns and deviation when winding is performed without performing disturb control with a package diameter of 238 mm.
[Explanation of symbols]
11 Traverse drum T0 Winding start Tb Some before Tc Just before P Package

Claims (3)

In the ribbon winding prevention method when winding the yarn while rotating the package on the traverse drum, winding is performed while performing disturbance control from the beginning of winding of the package, and disturbance control is performed to some extent before the winding diameter where a large ribbon can be formed. A method for preventing ribbon winding, wherein the ribbon is wound without being wound. From the beginning of winding of the package to a certain diameter before the winding diameter where a large ribbon can be made, winding is performed with disturb control with a reduced speed increase / decrease ratio of the traverse drum. 2. The ribbon winding prevention method according to claim 1, wherein the winding is performed without disturbing, and thereafter winding is performed under a disturb control with an increased acceleration / deceleration ratio of the traverse drum from just before the winding diameter where a large ribbon is formed until the winding diameter is passed. . In the ribbon winding prevention device when winding the yarn while rotating the package on the traverse drum, the inverter device that controls the rotation of the traverse drum and the diameter of the package is detected to some extent before the winding diameter that allows a large ribbon The package diameter sensor and the detection value of the package diameter sensor are input, and the disturbance control with a small increase / decrease ratio of the traverse drum is performed until the winding diameter of the large ribbon from the beginning of winding of the package to some extent before the large ribbon is formed. Disturbance command to the inverter device so that the disturbance control is performed with the increasing / decreasing ratio of the traverse drum until the winding diameter of a large ribbon is passed, without disturb control until just before the possible winding diameter. Ribbon winding prevention device comprising a logic circuit for outputting a signal .

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