JPH04194047A - Control of reeling tension of yarn - Google Patents

Abstract

PURPOSE:To prevent increase in reeling tension resulting from reduction in yarn winding diameter of a package by moving each yarn guide member in front of each package in the direction separating from the package with reduction in the yarn winding diameter of the package. CONSTITUTION:Distance L between each package 4 and each yarn guide member 5a is gradually enlarged with reduction in yarn winding diameter D of the package 4 and increase in reeling resistance of yarn Y reeling from each package is canceled with enlargement of the distance between the package and the yarn guide member.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a method for controlling the unwinding tension of yarn unwinding from a package.

[Prior Art] Conventionally, when unwinding yarn from each package set on the warping creel of a warping machine and winding it onto a warping beam, the warping speed, that is, the unwinding yarn speed from the package, is kept constant. ,
In addition, the warping work was performed while keeping the distance between the package and the tension device constant.

[Problems to be Solved by the Invention] When the yarn is unwound from the package at a constant speed and wound around the warping beam while the distance between the package and the yarn guide member is kept constant, the winding diameter of the package is When the unwinding resistance of the yarn is large, the unwinding resistance of the yarn is small, so the yarn is unwound with low tension. However, as the diameter of the winding yarn in the package decreases, the unwinding resistance of the yarn gradually increases and the yarn unwinds. The tension increases gradually, and at the end of winding the package, the unwinding tension of the yarn reaches its maximum.

Therefore, when the winding diameter of each package decreases, the winding tension of the yarn increases and the residual elongation decreases, resulting in yarn breakage during the warping process, or during the sizing process or weaving process. However, since each warp of the warp beam is wound together with a group of yarns with significantly different residual elongation and wound onto the loom beam, the woven fabric has no warp lines or warps. There is a problem that streaks occur and the quality of the fabric deteriorates.

The present invention aims to solve the above problems.

[Means for Solving the Problems] The present invention provides a means for guiding the yarn unwound from the package by adjusting each yarn guide member disposed at the front end of each package as the yarn diameter of the package decreases. The gist of the present invention is to provide a method for controlling the unwinding tension of yarn, in which the yarn is unraveled from each package while being gradually retracted in a direction away from the package.

[Function] When unwinding yarn from each package, the distance between each package and each yarn guide member disposed at the front of each package is gradually adjusted as the diameter of the wound yarn of the package decreases. The increase in the unwinding resistance of the yarn unwound from each package is offset by increasing the distance between the yarn guiding member and the package.

[Effects of the Invention] Since the present invention is configured as described above, as the diameter of the wound yarn in each package decreases, the distance between the package and the yarn guide member is gradually increased, thereby reducing the unwinding resistance of the yarn. The unwinding tension of the yarn can be kept constant from the beginning of unwinding to the entire unwinding path, and the unwinding tension can be prevented from increasing due to the decrease in the winding diameter of the package. This can be offset by increasing the distance between the two.

Therefore, it is possible to reduce yarn breakage in the warping process, sizing process, and weaving process, and also to wind each yarn around the warping beam with even tension. The difference in residual elongation between and within the taken yarns can be reduced, and the quality of the woven fabric can be improved.

[Example] Next, an example of a device used to carry out the present invention and a method of controlling the unwinding tension of yarn using this device will be described.

The warping creel 3 of the warping machine has a large number of packages 4 (one group each on the left and right) each wrapped with warp threads Y which are arranged in a sheet shape and wound around the warping beam 1 through the reed 2. It is set up to set up ~4.

On the warping creel 3, two rows of package mounting columns 3a are arranged in parallel at equal intervals, and are arranged in a horizontal row, and on each package mounting column 3a, package mounting columns 3a are arranged in a vertical row at equal intervals. A plurality of packages 4 are supported horizontally via package holders 20, respectively.

A pair of front and rear guide rails 21 are horizontally suspended at the front and rear ends of a pair of left and right upper frames 3b connected to the upper end of each row of package mounting columns 3a, respectively, with the vicinity of both ends protruding to both sides. are connected orthogonally.

A pair of left and right unwinding tension control mechanisms are installed in the warping creel 3 in order to control the unwinding tension of each yarn Y unwound from one group of left and right packages. Since both the unwinding tension control mechanisms are configured in the same manner on the left and right sides, the unwinding tension control mechanism on one side will be explained.

A servo motor type control motor 11 that can control speed is mounted on the front guide rail 21 at the frontmost package mounting column 3a.
A sprocket wheel 12A is fitted onto the output shaft of the control motor 11.

A transmission shaft 14 rotatably supported by a pair of front and rear bearings is horizontally mounted on both guide rails 21 in parallel with the upper frame 3b, and a sprocket wheel 12B is fitted to the front end of this transmission shaft 14. A pair of front and rear pinions 15 are fitted to the front and rear ends of the transmission shaft 14, and the control motor 1
1 rotation is transmitted to the transmission shaft 14 via the chain 13 that is hung between both sprocket wheels 12A and 12B.

An encoder 23 to which the rotation of the transmission shaft 14 is transmitted is attached to the front guide rail 21.
A pulse signal transmitted by the encoder 23 is input to a controller (not shown), and the speed of the control motor II is controlled over time based on the number of pulses transmitted by the encoder 23 according to commands from the controller.

A pair of front and rear racks are respectively attached to the upper surfaces of both guide rails 21, and a pair of front and rear rack gears I6 respectively meshed with front and rear pinions 15 are inserted into the ID 17 so as to be horizontally slidable in the axial direction of the package 4. A pair of front and rear brackets 19, each of which has a downwardly protruding central portion, is attached to the outer ends of both rack gears 16, and the upper ends of both brackets 19 are capable of rolling on guide rails 21, respectively. A pair of front and rear rollers 18 placed on the shaft are rotatably supported. control motor 11
When rotates, the transmission shaft I4 and both pinions 15 rotate, and both rack gears 16 move horizontally in synchronization with both brackets 19.

The front and rear ends of an upper moving frame 6A, which is suspended horizontally in parallel with the transmission shaft 14, are connected to the lower ends of both brackets 19, respectively. The upper ends of a large number of tension device mounting rods 7 arranged in a horizontal row are connected to each other, and the lower ends of each tension device mounting rod 7 are connected to the upper moving frame 6A, which is horizontally suspended below the upper moving frame 6A. 6B, respectively. A plurality of tension devices 5 are attached to each tension device mounting rod 7, respectively, and are arranged in a single vertical row, arranged in front of each package 4 in each column, and through which the unwound yarn Y passes. Each tension device 5 includes a yarn guide member 5a having a guide hole through which the yarn Y is inserted, and a pair of dish-shaped tensors 5b, 5b.

At the front ends of the vertically movable frames 6A and 6B, a plurality of extensions 22a extend horizontally to the sides and are arranged in the vertical direction.
A yarn guide base 22 is attached to each extending portion 22a of the yarn guide base 22, and a yarn guide 8 is provided on each extending portion 22a of the yarn guide base 22 to align the yarn groups unwound from the package groups in each stage in a horizontal row. Each is installed horizontally.

During the warping operation, the control motor 1 is driven to rotate at the time when yarn is unwound from each full package 4 and warping is started, and each tension device 5 is rotated as shown in FIG. 5, for example. control movement all at once. That is, control motor 1
1 holds the yarn guiding member 5a of each tension device 5 at the starting position closest to the package 4 at the beginning of unwinding when the yarn diameter of each package 4 becomes maximum, and
As the winding yarn diameter of the package 4 decreases, the winding yarn diameter of the package 4 is gradually retracted in a direction away from the package 4, and when the winding yarn diameter of the package 4 becomes the minimum, the winding yarn diameter of the package 4 is moved to the farthest position from the package 4. The distance between each package 4 and each yarn guide member 5a is gradually increased as the winding yarn diameter decreases, and each tension device 5 is returned to the starting position all at once after replacing the old and new packages 4.

When controlling the movement of the yarn guide member 5a of each tension device 5, the length from the maximum yarn diameter to the minimum yarn diameter of the package 4 is divided into an appropriate number of yarn diameter sections, for example, AO to A.
I, Al-A2...A4 to A5, and the speed of the control motor 11 is changed for each winding diameter section based on the number of pulses transmitted by the encoder 23, so that each thread guiding member 5a is moved to each winding thread diameter section. Move at an appropriate speed. However, in the early to middle stages of the transfer stroke of each yarn guide member 5a, the length of the winding thread diameter section is long and the speed change rate is small, and at the end of the transfer stroke, the length of the winding thread diameter section is short and the speed change rate is small. Set it to be larger.

Further, when controlling the movement of each yarn guide member 5a, the control motor 11 may be controlled to change the speed by directly detecting a change in the diameter of the wound yarn in the package 4, or by measuring the length of the unwound yarn from the package.

Next, the operation and effects of the embodiment having the above configuration will be explained.

In this example, in order to guide the yarn Y unwound from the package 4, the yarn guiding member 5a of each tension device 5 disposed at the front end of each package 4 is adjusted as the diameter of the winding yarn of the package 4 decreases. The yarn Y is unwound from the package 4 while being gradually moved away from the package 4 all at once.

Therefore, as the winding diameter of each package 4 decreases, the distance between the package 4 and the yarn guide member 5a is gradually increased to prevent an increase in the unwinding resistance of the yarn Y. The unwinding tension can be kept constant from the beginning of unwinding to the entire unwinding path, and the increase in unwinding tension due to the decrease in the diameter of the wound yarn in the package 4 can be suppressed by changing the distance between the package 4 and the yarn guiding member 5a. This can be offset by expanding the

Therefore, it is possible to reduce yarn breakage in the warping process, sizing process, and weaving process, and also to wind each yarn around the warping beam with even tension. The difference in residual elongation between and within the taken yarns can be reduced, and the quality of the woven fabric can be improved.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the apparatus used in the present invention. Figure 1 is a side view of the main parts of a warping creel,
Figure 3 is a plan view of the warping machine, Figure 3 is a plan view of the main parts, Figure 4 is an enlarged plan view of the package and tension device, and Figure 5 shows the diameter of the wound yarn of the package and the moving distance of the yarn guiding member. It is a diagram illustrating the relationship. 3...Warping creel 400. Package 5 - Tension device 5a... Thread guide member D... Thread diameter Y... Thread

Claims (1)

[Claims] In order to guide the yarn being unwound from the package, each yarn guide member disposed at the front of each package is gradually retracted in the direction away from the package as the yarn diameter of the package decreases. A method for controlling yarn unwinding tension, which comprises unwinding yarn from each package.