JP2000063041A - Thread slackening removing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of kinky threads when thread slackening is removed. SOLUTION: A thread slackening removing device 1 is so designed that compressed air flow along a simplex guiding surface 5 is generated to let a thread ride on the aforesaid air flow for removing the slackness of the thread Y. By this constitution, since the flow of compressed air flows out into the three directions (downstream direction, and both the side directions) over the guiding surface 5 for widening a slackened part, the occurrence of kinky threads can thereby be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yarn slack eliminating device, and more particularly to a yarn slack eliminating device for absorbing slack of a yarn unwound from a package during piecing in a spinning machine or the like.

[0002]

2. Description of the Related Art Generally, in an innovative spinning machine, piecing is performed by joining a yarn spun at the time of yarn breakage and a yarn unwound from a package.

As shown in FIG. 9, when a yarn breakage occurs, the yarn end on the package P side is pulled out from the package P by a yarn end sucking device or the like, and is grasped by a finger roller 51 located at an imaginary line position. Then, the finger roller 51 is moved to the solid line position by the turning operation of the transfer arm 52, and then the yarn end is sucked into the spindle 53. When the yarn end moves, the package P is reversely driven in the unwinding direction, whereby the yarn Y is sequentially paid out from the package P, and the yarn end can be moved. The package P is frictionally rotated by a drive roller 55 driven by a motor 54. When the yarn end is sucked into the spindle 53, the roller 56 of the finger roller 51 is driven to rotate a predetermined number of times,
As a result, the yarn end Y _E is projected to the discharge side of the spindle 53 by a predetermined length. A sliver supplied to a spinning unit (not shown) (air nozzle, front roller, etc.) is entangled with the protrusion by the spinning action, and piecing is performed.

Here, in order to carry out the threading operation to the spindle 53 without any hindrance, the thread must be unwound from the package P more than the moving length of the thread Y. Further, since it is mechanically difficult to synchronize these operation speeds, the yarn Y is usually unwound in a large amount from the package P, and the extra length is absorbed by the yarn slack eliminating device 57 to tension the yarn Y without loosening it. While moving the yarn Y.

The conventional yarn slack eliminating device has a slug tube 58 as shown in the figure. This is a flat cylinder with a rectangular cross section,
The extra length of the yarn is sucked and a U-shaped slack portion 59 is formed inside. In particular, since the surface of the yarn is fluffed, the yarns are easily entangled with each other on the package P, and if the unwound yarn has an extra length, it may be reversely wound. The yarn Y is peeled off from the yarn and absorbed in the tube 58.

[0006]

However, since the conventional slag tube absorbs the excess length by suction, the suction force is weak near the inlet, and the package thread is peeled off unless it enters the tube for a certain length or longer. Does not generate enough pulling force. On the other hand, if the suction length is increased in this way,
As shown in FIG. 10, warp (snarl) C due to the twisting torque of the yarn is likely to occur in the tube 58, and a defect may occur at the yarn splicing portion.

Japanese Patent Publication No. 54-27464 discloses a method in which compressed air is blown into a tube and the ejector effect is used to suck the yarn. However, since this slag tube has a perfect cylindrical shape, eddies and turbulence (indicated by R in FIG. 10) due to separation from the inner wall of the tube are likely to occur on the downstream side, and there is a drawback that chattering is likely to occur.

The present invention was devised to solve the above problems, and an object of the present invention is to provide a yarn slack eliminating device which can prevent the occurrence of chatter during slack elimination.

[0009]

SUMMARY OF THE INVENTION The yarn slack eliminating device according to the present invention is designed to generate a flow of compressed air along a single guide surface, and to slacken the yarn by riding on this air flow. is there.

According to this, the flow of the compressed air flows out in three directions (downstream direction and both side directions) of the guide surface, so that the slack portion is widened and the occurrence of chattering can be prevented.

Here, it is preferable that a rising piece is provided on the upstream side of the guide surface in the air flow direction to prevent outflow of the air out of the surface.

According to this, the direction of the flow can be strengthened and the tensile force of the yarn can be increased.

Further, it is preferable that an auxiliary nozzle for generating a further flow of compressed air is provided at an intermediate portion of the guide surface in the air flow direction.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, the yarn slack eliminating device 1 is provided with a pair of nozzles 3 at one end of a plate member 2 so that a flow of compressed air is formed on a surface 5 of the plate member 2. It is configured. The plate member 2 is formed of a rectangular flat plate having a length of about 300 mm, and the nozzle 3 has a predetermined pressure (for example, 3 kg) from one end (the right end in the drawing) to the other end (the left end in the drawing) of the plate member 2 in the long side direction. / cm ² ) compressed air is blown. The nozzles 3 are separated from each other in the short side direction of the plate member 2,
It is arranged near both ends in the short side direction. The nozzle 3 is made of a pipe material, and is integrally fixed to the surface 5 of the plate member 2 by welding or the like. As shown in FIG. 5, the outlet 9 of the nozzle 3 is crushed so as to extend along the surface 5 as much as possible, and has an elliptical cross section here.

As shown in FIG. 1, a pair of standing pieces 4 are provided at a position slightly downstream (left side in the drawing) from the nozzle outlet 9. The upright pieces 4 are integrally fixed to both side surfaces of the plate member 2 in the short side direction, and are upright on the surface 5 of the plate member 2. The standing piece 4 is also a rectangular flat plate. As shown in FIG. 4, a corner portion 7 formed by the inner side surface 6 of the standing piece 4 and the surface 5 of the plate-shaped member 2 is finished to have a rounded cross-section by welding or the like. A guide pin 8 as a yarn guide means is provided at the upstream end of each standing piece 4. The guide pins 8 are integrally fixed to both side surfaces of the plate member 2 in the short side direction,
And is projected on the surface 5 by a predetermined length. The guide pin 8 may be integrated with the upright piece 4.

Two auxiliary nozzles 1 are provided on the surface of the plate member 2.
0 is provided. The auxiliary nozzles 10 are provided in series in the central portion of the surface 5 so as to be spaced apart in the upstream and downstream sides in the air flow direction, and blow out compressed air toward the downstream side, respectively. As shown in detail in FIG. 6 and FIG. 7, the auxiliary nozzle 10 penetrates the plate-shaped member 2, the outlet portion 11 is projected on the surface 5, the outlet portion 11 is bent along the surface 5, and is flat. It is crushed into a shape and fixed integrally on the surface 5. The outlet portions 11 of these auxiliary nozzles 10 are embedded in the built-up portion 12 made of putty or the like placed on the surface 5. The build-up portion 12 is finished in a flat round shape so as not to disturb the air flow on the surface 5, and also when the thread reciprocates on the build-up portion 12, the thread is not caught. ing. The downstream portion of the built-up portion 12 is cut out in a trumpet shape so that air can be blown from the outlet of the auxiliary nozzle 10. Each of these auxiliary nozzles 10 is arranged at the center position of the plate member 2 in the short side direction.

Next, the operation of this embodiment will be described.

As shown in FIGS. 2 and 3, when compressed air is blown from the nozzle 3, compressed air flows along the surface 5, and the yarn Y is placed on the compressed air to remove the slack of the yarn Y. The extra length of the yarn Y can be absorbed. In particular, when air is blown onto the surface 5 in this manner, a flow of air along the surface 5 is created by the Coanda effect. Therefore, by utilizing this, the yarn Y can be held in a U-shape in a state of being stuck on the surface 5.
The yarn Y is bent from the guide pin 8 to reach the downstream side and is curved in a U shape. In addition to reaching the downstream side, the air flow will also flow out to both sides perpendicular to the air flow direction.
By placing the yarn Y on this flow, the yarns Y can be spread out to prevent entanglement and prevent the occurrence of chattering. According to the surface 5 thus formed, a flow can be formed from the in-plane direction to the out-of-plane outflow direction, so that the occurrence of chattering can be reliably prevented.

Further, the upright pieces 4 prevent the air just after being blown out from flowing out to both sides, and strengthen the directionality of the flow. The air can also flow along the inner surface of the upright piece 4. Eventually, the yarn Y is driven into the vicinity of the corner portion 7 having a round cross section shown in FIG. As a result, the tensile force of the yarn Y can be increased, and the yarn Y can be reliably placed on the downstream side to maintain a clean U-shape.

The length of the rising piece 4 in the air flow direction is preferably about 5 to 20 times the hole diameter of the nozzle 3. If it is too long, the air flow will be disturbed, and chattering will easily occur, and the yarn Y will not have a clean U-shape.

Here, even if the absorption length becomes long, the flow in the downstream direction can be again applied to the yarn Y by the auxiliary nozzle 10, so that the flow can be stabilized and the occurrence of chattering can be reliably prevented.

Especially, since the yarn Y is positively pushed by compressed air, a higher tensile force can be obtained as compared with the suction method, which is very advantageous for the above-mentioned yarn peeling. This also applies when the absorption length is short. Also, since the air flow rate is small, the power cost can be reduced.

Further, the absorbed slack portion can be easily confirmed from the outside, which is convenient for checking the operation.

As described above, since the compressed air flows along the surface 5 which is a single guide surface to remove the slack of the yarn, the occurrence of chattering can be prevented without causing eddy or turbulence. It can be surely prevented. This is very effective for piecing in a spinning machine or the like.

Here, as shown in FIG. 8, a guide groove 13 may be provided as a yarn guide means instead of the guide pin 8. The guide groove 13 is provided at the end of the guide block 14 on the upstream side in the air flow direction, and the guide block 14 is integrally fixed to the end surface of the upright piece 4 on the upstream side in the air flow direction. However, the guide groove 13 may be provided directly on the upright piece 4. The end portion of the guide block 14 is finished in a round shape, the guide groove 13 is cut out by a predetermined length along the air flow direction, and the bottom surface 15 is flush with the surface 5.
According to this, the yarn Y is put in the guide groove 13 and bent, and can be smoothly guided on or from the surface 5.

Various other embodiments of the present invention are possible. For example, the guide surface may be provided on the surface of the block-shaped member instead of the plate-shaped member. The guide surfaces may be separated from each other in parallel and a flow of compressed air may be formed between them. The guide surface is not limited to a flat surface and may be a curved surface. The number of nozzles may be one, or the auxiliary nozzle may be omitted. Similarly, the standing piece can be omitted.

[0028]

In summary, according to the present invention, it is possible to prevent the occurrence of chattering during slack removal, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a yarn slack eliminating device according to the present invention.

FIG. 2 is a perspective view showing the operation of the present embodiment.

FIG. 3 is a plan view showing the operation of the present embodiment.

FIG. 4 is a vertical sectional front view showing a connecting portion between a plate-shaped member and a standing piece.

FIG. 5 is a perspective view showing an outlet of a nozzle.

FIG. 6 is a plan view showing an auxiliary nozzle.

FIG. 7 is a vertical sectional side view showing an auxiliary nozzle.

FIG. 8 is a perspective view showing a guide groove.

FIG. 9 is a schematic configuration diagram showing a conventional yarn slack eliminating device applied to a spinning machine.

FIG. 10 is a diagram showing a state of occurrence of chattering.

[Explanation of symbols]

4 Standing pieces 5 Surface (guide surface) 10 Auxiliary nozzle Y thread

Claims (3)

[Claims] 1. A yarn slack eliminating device, characterized in that a flow of compressed air along a single guide surface is generated, and the yarn is slackened by the flow of the compressed air. 2. The yarn slack eliminating device according to claim 1, wherein a standing piece is provided on the upstream side of the guide surface in the air flow direction to prevent outflow of the air out of the surface. 3. The yarn slack eliminating device according to claim 1, wherein an auxiliary nozzle for generating a further flow of compressed air is provided at an intermediate portion of the guide surface in the air flow direction.