JPH0735223B2 - Thread winding method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a parn winding method for winding crimped yarn, particularly false twisted yarn, which is suitable for winding.

(Prior Art) When continuously stretching and false twisting a synthetic fiber yarn,
The obtained false twisted yarn is usually bun-wound. That is, using a ring twisting machine, while winding the ring rail loosely, winding the above yarn around a parallel bobbin into a coil of fine pitches, and raising and lowering stroke of the ring rail, in other words, the traverse width of the yarn by a predetermined amount. The conical portions are formed on the upper and lower sides of the winding yarn by decreasing gradually. Then, in the basic type bun winding method in which the traverse width is linearly reduced, the yarn density increases at the boundary between the conical portion and the parallel portion, the yarn layer at the boundary portion rises in a headband shape, and so-called earing occurs, Therefore, when the wound yarn (pan) obtained is set on a knitting machine or the like and is pulled out, when the yarn speed on the knitting machine is high at 800 m / min or more, the unraveling yarn is caught on the edge of the ear and breaks. Was occurring. Therefore, recently, a variwind method as shown in FIG. 3 has been adopted.

In FIG. 3, 1 is a bobbin, 2 is a pan, 2a is a conical portion, and 2b is a parallel portion. The upper and lower alternate long and short dash lines 3 are the first reference lines, and the conventional pan 2 has the first reference line 3 in which the yarn is above and below,
It was wound up and down while traversing between 3 up and down gradually. An alternate long and short dash line 4 inside the first reference line 3
Is the second reference line, and the first reference line 3 and the second reference line 4
The dotted line 5 drawn in a mountain shape between and is the third reference line, and in the variwind method, the yarn was wound while traversing between the upper and lower third reference lines 5 and 5. That is, the solid line 6 shows the traverse locus of the yarn, and when the yarn end is wound around the lower end of the bobbin 1, the winding position of the yarn gradually rises as the ring rail (not shown) rises, and the traverse When reaching the upper end of the width, the winding position turns downward, the traverse width above and below is gradually reduced according to the third reference lines 5 and 5, and when the valley portion 5a is reached, the traverse width is gradually increased next, When it reaches the mountain portion 5b, the traverse width is gradually reduced again, and this is repeated thereafter to form the awn 2.

(Problems to be Solved by the Invention) In the conventional variwind method, since the reverse position of the traverse is simply provided on the zigzag-shaped third reference line 5, the amplitude of the zigzag-shaped third reference line 5, that is, the third reference line 5. 1 reference line 3
If the distance between the second reference line 4 and the second reference line 4 is set to be small, the effect of adopting the variwind method is not obtained, and the cone portion 2a of the pan 2 is not used.
The yarn overlaps at the boundary between the parallel part 2b and the parallel part 2b, which makes it difficult to unravel the yarn. Conversely, if the amplitude is set to a large value, the unraveling of the yarn becomes easier, but the boundary becomes round, It was easy to cause a pan collapse.

The present invention provides a pirn winding method for improving the variwind method so as to easily unravel the yarn and to obtain a pirn which does not cause bun collapse.

(Means for Solving the Problems) In FIG. 1, when the traverse width is linearly reduced by a predetermined width and the yarn is pan-wound, the above straight line is used as a reference line 3 and the reference line 3 is used. By gradually increasing the traverse width, that is, by setting the turning point of the traverse on the straight line 3c-3a, and by parallel winding in which the traverse width is gradually reduced in parallel with respect to the reference line 3, that is, Winding to set the traverse turning point on the straight line 3a-3b and taper winding to gradually decrease the traverse width to the reference line 3 further, that is, set the traverse turning point on the straight line 3b-3c. The winding is repeated by sequentially repeating the setting and winding. However, the difference between the maximum value and the minimum value of the traverse width is 3 to 10 mm on one side, and the moving time is 100 to 500 seconds from the start of the gradually decreasing winding to the end of the gradually increasing winding, and once again. The residence time of parallel winding is
Set each to 1/4 to 3 times.

(Function) Compared with the basic type bun winding method in which the traverse turning point is placed on the reference line 3, the amount of yarn is small and the coil is roughly wound by the amount obtained by connecting the three points 3b, 3c and 3a. And
In the next stage, the traverse is turned back on a part of the reference line 3 and a straight line connecting the two points 3a and 3b. That is, a portion where the turn-back points of the yarn are coarsely dispersed is overlapped with a portion where the turn-back points are dense and a prominence is generated, and as a result, the density is about the same as the other portions, and when the obtained pan is wound, the yarn is folded. It can be pulled out easily and the occurrence of collapse is prevented.

In this case, according to the experiment, the entanglement of the threads in the upper and lower layers does not occur when the overlapping of the threads in the folded back portion is about several times,
Although there is no hindrance to the drawing at the time of rewinding, if there are a dozen or more overlaps, the yarns in the upper and lower layers are entangled and the drawing is affected. That is, when the depth h is less than 3 mm, there is a large amount of overlapping yarns, making it difficult to unravel the yarns. Further, if the movement time Ta is less than 100 seconds, it is too short as compared with the ascending / descending speed of the ring rail, so that there is no effect. On the contrary, if it exceeds 500 seconds, it is too long and the shape collapses. Further, when the residence time Tb is less than 1/4 of Ta during movement, the amount of raised edges is small and the shape collapses. On the contrary, when it exceeds 3 times, the yarn overlaps more and the releasability deteriorates.

(Example) In FIG. 2, 10 is a ring rail, 11 is a ring, and 12 is a traveler. The ring 11 moves up and down as the ring rail 10 moves up and down, and a spindle (not shown) is formed at the center of the ring 11. ), The yarn (false twisted yarn) Y supplied from above to the surface of the bobbin 1 which is supported and rotated by the yarn guide 13
And, it is wound while being twisted through the traveler 12 on the ring 11 to form the pan 2.

A swingable L-shaped lever 15 having a shaft 14 as a fulcrum is located above the ring rail 10, and a horizontal end of the L-shaped lever 15 is connected to an upper protrusion 10a of the ring rail 10 by a pin 15a. The vertical end of the L-shaped lever 15 is connected to the front end of the piston rod 16a of the hydraulic cylinder 16 by a pin 15b, and the descending pipe 17a and the ascending pipe 17b connected to the front and rear ends of the hydraulic cylinder 16 are electromagnetic switching valves. When the hydraulic oil is supplied to the descending pipe 17a by an electric signal input to the solenoid operated directional control valve 18, the piston rod 16a retracts and the ring rail 10 descends. When hydraulic oil is supplied to the ascending pipe 17b by the electric signal, the piston rod 16a is pushed out and the ring rail 10 ascends.

20 is a screw shaft provided vertically on a stationary frame on the side (not shown), and this screw shaft 20 is
Lower threaded portion 20a and upper threaded portion 20b in different directions
And is connected to a reversible motor (not shown) to rotate alternately in forward and reverse directions. The lower screw portion 20a and the upper screw portion 20b are respectively screwed with a lower nut 21 and an upper nut 22 which are freely rotatable and whose rotation is restricted. The lower nut 21 and the upper nut 22 are provided with ring-shaped non-contact switches 21a and 22a, respectively, which are connected to the signal input terminal of the electromagnetic switching valve 18 by the descending circuit 23a and the ascending circuit 23b, respectively. When the contactless switch 21a of 21 is closed, the supply of hydraulic oil is switched from the ascending pipe 17b to the descending pipe 17a. Conversely, when the contactless switch 22a of the upper nut 22 is closed, the supply of hydraulic oil is decreased. The for-use pipe 17a is switched to the ascending pipe 17b.

Reference numeral 24 denotes an elevating frame that moves up and down in conjunction with the lifting movement of the ring rail 10, and is provided near the screw shaft 20. A ratchet 26 is fixed to one end of a horizontal shaft 25 provided on the elevating frame 24, and is intermittently fed by a feed claw 27 that reciprocates in conjunction with the lifting movement for the ring rail, and the ring rail 10 reciprocates nine times. Thus, the ratchet 26 and the horizontal shaft 25 rotate once. Two plate cams 27a and 27b having the same shape are fixed to the other end of the horizontal shaft 25 with their phases shifted by 180 degrees. A roller 28a at the upper end of a vertically movable first elevating shaft 28 biased upward is pressed against the lower surface of the first plate cam 27a on the left side, and a horizontal arm 28b is projectingly provided at the lower end of the first elevating shaft 28. A lower adjusting rod 29a that can be inserted into the ring-shaped endless switch 21a of the lower nut 21 is fixed upward at the tip of the horizontal arm 28b. On the other hand, the roller 30a at the lower end of the vertically movable second elevating shaft 30 urged downward is pressed against the upper surface of the second plate cam 27b on the right side, and the horizontal arm 30b is projectingly provided at the upper end of the second elevating shaft 30. An upper adjusting rod 29b that can be inserted into the ring-shaped endless switch 22a of the upper nut 22 is fixed downward to the tip of the horizontal arm 30b. When the lower adjusting rod 29a enters the hole of the lower contactless switch 21a, the lower contactless switch 21a closes, and when the upper adjusting rod 29b enters the hole of the upper contactless switch 22a, the upper contactless switch The contact switch 22a is closed.

In the above structure, when the machine base is driven, the ring rail 10 starts moving up and down, the screw shaft 20 starts rotating in one direction, and the lower nut 21 and the upper nut 22 are respectively moved to the reference line 3 in FIG. 3, the distance between the two is gradually narrowed to control the traverse width of the ring 11. Further, along with the start of the drive, the elevating frame 24 starts ascending / descending movement at the same speed as the ring rail 10, and as the ring rail 10 rises, the lower adjusting rod 29a is inserted into the hole of the lower contactless switch 21a. When entering, the oil passage of the electromagnetic switching valve 18 is switched, the ring rail 10 starts to descend, and the ring rail
When the elevating frame 24 starts descending together with 10, the upper adjusting rod 29b enters the hole of the upper contactless switch 22a, the oil passage of the electromagnetic switching valve 18 is switched again, and the ring rail 10 and the elevating frame 24 Turns to rise again. In this way, the traverse width of the ring 11 is set to the reference lines 3 and 3.
However, the horizontal axis 25 on the lifting frame 24 starts to rotate during this time, and the vertical distance from the horizontal axis 25 to the lower adjusting rod 29a and the upper adjusting rod 29b follows the profile of the plate cams 27a, 27b. When the rollers 28a, 30a are in contact with the reduced diameter portions of the plate cams 27a, 27b, the traverse width becomes the first
It becomes narrower along the line connecting the two points 3b and 3c in the figure, and the plate cam 27
When the rollers 28a, 30a are in contact with the increased diameter portions of a, 27b, the traverse width increases along the straight line connecting the two points 3c, 3a in FIG. 1, and the large diameter stationary portions of the plate cams 27a, 27b. On rollers 28a, 3
When 0a is in contact, the traverse width is 2 points 3a and 3b in Fig. 1.
According to the reference line 3, that is, according to the reference line 3.

A false twisting machine having the above structure was used to perform false twisting of a nylon 6 multifilament yarn (30 denier, 10 filament). However, the false twist speed is 800 m /
The heater temperature to 180 ° C, the disk surface speed to false twist speed ratio D / Y to 1.75, the draw ratio DR to 3.10, and the false twist zone feed ratio F ₁ to -2%. The rail lifting speed is set to 25 seconds / reciprocation, and the depth h, the moving time Ta and the dwell time Tb in FIG. 1 are variously changed to relate to the collapse of the shape of the pan and the resolvability at the time of rewinding. The filament cracks were compared. The results are shown in the table below. However, shape collapse, filament cracking and comprehensive evaluation were evaluated by the following methods.

Filament cracking: A gap is created between yarns on the surface of the bun, and the filaments of the loosening yarn fall into this gap, resulting in poor loosening and a single yarn breakage. Insert the pan into a horizontal spindle peg to rotatably support it, unravel the yarn on the pan with a load of 0.001 g / d,
100 times each, counting the number of filament hooks that occurred during the total 100m of unraveling. In this case, there is a close relationship between the number of cracks in filament (pieces / 100m) and the occurrence rate of user defective yarns when using the yarn of this pan, and the number of cracks in filament is 50 pieces / 100m or less. , 51 to 80 /
At 100 m and 80 yarns / 100 m or more, the user defective yarn occurrence rates are 0.2% or less, 0.2 to 2% and 2% or more, respectively.

Shape collapse: Fix the pan horizontally, form a loop with 840 denier thread, hang this loop on the shoulder of the pan, hang 40 g weight on the lower end of the loop, slide the above loop 5 times, The degree of collapse was evaluated by classifying it into 5 grades. Those with no collapse were grade 1, grades with almost no grade were grade 2, slight presence was grade 3, grades with grade 4 and grades with severe grade 5.

Comprehensive evaluation: Evaluated by the user of the pan, very good without problems, marked with ◎, and with problems but usable
And the unusable ones were marked with x.

As is clear from this table, Comparative Example 1 of the basic type bun winding method is favorable in that the shape collapse is small, but the filament cracking is the most. In Comparative Examples 2 and 3 of the conventional variwind method in which the residence time was set to 0 and Comparative Example 4 in which the depth h (mm) was excessively large, the filament cracking was improved, but the shape collapsed frequently. Comparative Example 5 in which the moving time Ta is small
In Comparative Example 6, there are many filament cracks, and in Comparative Example 6 in which the moving time Ta is excessively large, the shape collapses frequently. Further, Comparative Example 7 in which the depth h was too shallow and Comparative Example 8 in which the retention time Tb was too long had many filament cracks, and Comparative Example 9 in which the retention time was short had many deformations. On the other hand, in Examples 1 to 4 in which the moving time Ta, the residence time Tb, and the depth h were appropriate, the shape evaluation and the filament cracking were small, and the comprehensive evaluation was excellent.

(Effect of the Invention) According to the present invention, it is possible to suppress the raised edges at the boundary portion between the conical portion and the parallel portion of the pan, improve the resolving property at the time of rewinding, and prevent the shape collapse. Moreover,
This bun winding method is possible by providing a valley in the traverse width setting reference line for forming the basic bun, so it is only necessary to slightly modify the profile of the plate cam in the winder. The purpose can be achieved.

[Brief description of drawings]

FIG. 1 is an explanatory view of a traverse locus showing an embodiment of the present invention, FIG. 2 is an explanatory view showing an example of an apparatus used in the present invention, and FIG. 3 is an explanatory view of a traverse locus in a conventional variwind. 1: Bobbin, 2: Pan, 3: Reference line, 6: Traverse locus, 1
0: Ring rail, 11: Ring, h: Depth, Ta: Travel time, T
b: Residence time.

Claims (2)

[Claims] 1. When the traverse width is linearly reduced by a predetermined width and the yarn is pan-wound, the straight line is used as a reference line, and the traverse width is gradually increased with respect to the reference line. The maximum value and the minimum value of the traverse width are sequentially repeated by parallel winding in which the traverse width is gradually reduced in parallel to the reference line and winding, and gradual winding in which the traverse width is gradually reduced to the steep angle with respect to the reference line. The difference with 3-10mm on one side
The moving time from the start of the gradually decreasing winding to the end of the gradually increasing winding is 100 to 500 seconds, and the residence time of one parallel winding is 1/4 to 3 times the moving time. A parn winding method of thread, which is characterized by being set. 2. The yarn is a crimped yarn and has a winding speed of 200 to 1
The yarn panicling method according to claim 1, which is 000 m / min.