JPS61273467A - Thread unravelling method from winding bobbin - Google Patents

Abstract

PURPOSE:To improve unraveling property and uniform unraveling tension, by ejecting fluid to a ballooning portion so that unraveling ballooning is increased during unraveling a thread from a winding bobbin for positively giving unraveling power to the thread. CONSTITUTION:When a thread is unraveled from a winding bobbin 1, a dead weight and an unraveling speed of the thread caused ballooning due to centrifugal force to be produced between the thread and a unraveling guide 8. There are various types of ballooning as shown in (a) and (b) depending upon a position of the guide 8 and a thread winding method. In particular, the ballooning state in (b) has the thread contact the edge of a thread winder, which causes irregular tension and thread cutting. Thus, fluid such as air, water is ejected from the inside to the outside of the ballooning in the unraveling direction and/or the direction normal to the unraveling direction so that a large bellooning is produced. As a result, the thread is prevented from contacting the thread winder and an unraveling power is positively increased for improving unraveling property and uniforming unraveling tension.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for unwinding a yarn wound around a bobbin from the take-up bobbin in the axial direction of the bobbin, and more specifically relates to a method for unwinding yarn wound around a bobbin in the axial direction of the bobbin. This invention relates to a method for unwinding yarn from a take-up bobbin, which improves efficiency and quality.

(Prior Art) Conventionally, when unwinding yarn from a winding bobbin, the winding bobbin is generally mounted on a spindle of an unwinding stand, and
The thread was being unwound in the axial direction of the bobbin.

At this time, the unwinding tension can be adjusted by: a) making the position of the unwinding guide installed in front of the take-up bobbin freely adjustable and adjusting it according to the yarn speed; or b) using a conical method with respect to the unwinding guide. Those using a stand with a spindle arranged, etc. are known, and each is in practical use.

f) Problems to be Solved by the Invention) Unwinding performance in which the position of the unwinding guide in a) above is freely adjustable, ballooning due to yarn speed is observed, and the position of the unwinding guide is adjusted according to the size of the ballooning. The improvement method does not actively assist in unwinding the yarn, nor does it reduce the variation in unwinding tension caused by the unwinding position (unwinding position).

In addition, the above b) method in which the spindles are arranged in a conical shape with respect to the unwinding guide also allows for perfect centering with respect to the unwinding guide, continuous unwinding of yarn from multiple bobbins, and operation. Although the aim was to improve efficiency, it did not actively improve unwinding performance.

From the above situation, improvement of unwinding performance based on conventional knowledge is
From the user's perspective, the desire is limited to improving unwinding performance by improving the bobbin shape, wind hardness, etc. during winding production, and therefore, a means to actively improve unwinding performance has been desired.

The purpose of the present invention is to solve the above-mentioned conventional problems, and to actively apply unwinding force to the yarn when unwinding the yarn from the bobbin, to improve the unwinding property, to make the unwinding tension uniform, and to improve the unwinding force. It is an object of the present invention to provide a method for unwinding yarn from a take-up bobbin, which can reduce yarn breakage and increase unwinding speed.

(Means for solving problems) The structure of the present invention that achieves the above object is as follows.

That is, in the method of unwinding the yarn from the take-up bobbin in the axial direction of the take-up bobbin, while unwinding the yarn from the take-up bobbin, the ballooning part is unwound in a direction that increases the unwinding ballooning of the yarn. This is a method for unwinding yarn from a winding bobbin, which is characterized by jetting fluid.

Hereinafter, the present invention will be described in detail based on one embodiment shown in the drawings.

FIG. 1 is a schematic diagram of an apparatus for carrying out the method of the invention.

In the figure, 1 is a bobbin, 2 is a thread wound around the bobbin 1, 3 is a hollow spindle on which the bobbin 1 is attached,
4 is an unwinding stand that supports the spindle 3; 5 is a fluid conduit for guiding fluids such as compressed air and water; the fluid conduit 5 is fitted into the hollow part of the hollow spindle 3; A fluid injection conduit 6 having a fluid injection hole 9 is attached to the tip of the fluid introduction tube 5 so as to be slidable with respect to the fluid introduction tube 5 in a state of protruding outside the bobbin. The position between the tip of the injection conduit 6 and the unwinding guide 8 can be freely adjusted.

Reference numeral 7 denotes a flow rate control valve provided in the middle of the fluid introduction pipe 5 for adjusting the amount of fluid ejected.

FIG. 2 (A>(B) is a diagram showing an embodiment of the fluid injection conduit 6 attached to the tip of the fluid introduction pipe that can be applied to the present invention, and FIG. 2(B) is a side view showing an embodiment in which a large number of fluid injection holes 9 are formed on the outer periphery in the direction of enlarging the diameter of the ballooning, and FIG. 2(B) is an embodiment in which the fluid injection holes 9' are formed in a spiral groove. FIG.

FIG. 3 is a diagram showing the state in which ballooning occurs when the yarn is unwound from the winding bobbin.

When unwinding the yarn from the winding bobbin, ballooning occurs due to centrifugal force between the yarn and the unwinding guide 8 due to the weight of the yarn and the unwinding speed of the yarn.

This ballooning appears as a variable speed movement as shown in (a) and (b) in Figure 3 depending on the position of the unwinding guide and the winding form, but in particular, the ballooning state shown in (b) The thread came into contact with the end surface of the thread body, causing tension unevenness and thread breakage.

The present invention solves the problem of ballooning by injecting fluid such as air or water from the inside of the balloon to the outside of the balloon in the unwinding direction of the yarn and/or in the direction orthogonal to the balloon. This system actively prevents the ballooning from coming into contact with the end surface of the winding body, and actively applies unwinding force to improve unwinding performance and equalize the unwinding tension.

Example Using a winding bobbin wound with a 75-denier polyester yarn and a 36-filament yarn, the polyester yarn was unwound at a speed of 1000 m/min and a compressed air of 2 kq/cm2 was applied to the yarn using the apparatus shown in FIG. A comparative experiment was conducted between the method of the present invention in which compressed air was injected in the unwinding direction, and the conventional method in which compressed air was not injected. Note that a winding bobbin with a winding width of 210 mm was used.

As shown in FIG. 3, the position of the bobbin end on the unwinding side is set to O, and the results of measuring the number of yarn breaks with respect to the position of the winding bobbin in the width direction are shown in the graph of FIG. Moreover, FIG. 5 shows fluctuations in the unwinding tension for both.

FIG. 4 is a graph in which the horizontal axis shows the bobbin position in the winding width direction, and the vertical axis shows the number of thread breaks.

In FIG. 4, the thin line indicates the conventional method, and the thick line indicates the method of the present invention. In contrast to the conventional method in which no fluid is injected into the ballooning portion, the number of yarn breakages was 225, the method of the present invention significantly reduced the number of yarn breakages to 53.

In addition, in the conventional method, the unwinding tension was 9.9CHj, and the tension fluctuation σ
was 4.0, whereas in the method of the present invention, the unwinding tension was 9.200 and the tension variation was extremely small, 9.200 and 1.03.

(Effects) As explained above, the present invention has the above-mentioned configuration, that is, the ballooning portion is directed in the direction of increasing the unwinding ballooning of the yarn while unwinding the yarn from the take-up bobbin. By spraying fluid, it actively applies unwinding force to the yarn, improving unwinding performance, equalizing the unwinding tension, reducing the number of yarn breaks, and increasing the unwinding speed. Productivity will be improved.

Therefore, the present invention provides 1000
It can be applied to weft unwinding in a high-speed water jet loom that requires unwinding at a speed of m/min or higher.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an apparatus for carrying out the method of the invention. FIG. 2 (A>(B) is a diagram showing an embodiment of the fluid injection conduit 6 attached to the tip of the fluid introduction tube that can be applied to the present invention, and FIG. 2 (A) shows the outer periphery of the hollow circular tube. FIG. 2B is a side view showing an embodiment in which a large number of fluid injection holes 9 are formed in the direction of expanding the diameter of the ballooning, and FIG. 2(B) shows an embodiment in which the fluid injection holes 9 are formed in a spiral groove. This is a plan view. Figure 3 is a diagram showing the occurrence of ballooning when unwinding the yarn from the winding bobbin. Figure 4 shows the relationship between the position in the winding width direction and the number of yarn breakages. Brief explanation of the drawings 1...Bobbin 2...Wound layer 3...
Bobbin mounting spindle

Claims (1)

[Claims] In the method of unwinding the yarn from the take-up bobbin in the axial direction of the take-up bobbin, fluid is supplied to the ballooning portion in a direction that increases the unwinding ballooning of the yarn while unwinding the yarn from the take-up bobbin. A method for unwinding a yarn from a take-up bobbin, which comprises a method of unwinding a yarn from a winding bobbin.