JPH11229242A - Drafting apparatus of fine spinning frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the yarn quality of a three-line drafting apparatus. SOLUTION: This three-line drafting apparatus 1 is constructed of a pair of top and bottom front rollers 2,3, top and bottom second rollers 4,5 both having the form of apron rollers and back rollers 6,7 consisting of a top apron roller and a bottom fluted roller. The apparatus is provided with a guide plate 14 contacting with the lower face of the apron 10 of the back bottom roller 7, and the upper face of the guide plate 14 is positioned 1-5 mm above a line connecting the nip points N1 and N2 of the second rollers 4,5 and the back rollers 6,7. The control of the floating fiber of a fiber bundle S becomes effective by this structure to improve the yarn quality.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-line drafting device for a spinning machine suitable for high-draft spinning. More specifically, the top and bottom rollers of a back roller are an apron roller and a streak roller, respectively. The present invention relates to a draft device for a spinning machine provided with a guide plate that is pressed against a lower surface.

[0002]

2. Description of the Related Art A conventional drafting device for a spinning machine is disclosed in Japanese Patent Application Laid-Open No. 8-144134 filed by the present applicant. This means that the top and bottom second rollers are apron rollers, the top and bottom back rollers are apron rollers and streak rollers, respectively, the top and bottom pair of front and bottom rollers are the main draft zone, and the second and back rollers are This is a three-wire draft device in which a back draft zone is provided between rollers. A guide plate is provided between the second bottom roller and the back bottom roller so as to press against the lower surface of the apron of the back top roller. The apron roller of the back roller is directly rotated by the muscle roller, and the fiber bundle (supply fiber) sandwiched between the two is fed at substantially the surface speed of the muscle roller, and the back top roller is used as an apron roller. Also, the total draft with the front roller does not fluctuate, and the thickness of the yarn can be kept constant. In addition, by holding and transporting the fiber bundle between the apron of the back-top roller and the guide plate and suppressing the floating fibers, the draft amount in the back draft zone can be set large, and the distribution of the draft amount is appropriately adjusted. The aim is to improve the yarn quality.

[0003]

As a result of further testing of the above-mentioned prior art, it is found that the floating fibers of the fiber bundle can be effectively obtained simply by simply pressing the guide plate having the guide surface bulging upward on the lower surface of the apron of the back-top roller. It turned out that suppression control was not possible. For this reason, prevention of yarn unevenness and yarn breakage may not be sufficiently exhibited, which may hinder improvement in yarn quality. An object of the present invention is to further improve the yarn quality in the conventional draft device.

[0004]

In order to solve the above-mentioned problems, a pair of top and bottom front rollers, a top roller,
A main draft zone is formed between a second roller and an apron roller at the bottom, a back draft zone is formed between a second roller and a back roller, and a top roller of the back roller is an apron roller and a bottom roller is a streak roller. In a three-line drafting device of a spinning machine provided with a guide plate that presses against the lower surface of the apron of the apron roller of the back roller between the streak roller and the bottom apron roller of the second roller, the nip of the fiber bundle of the second roller and the back roller The upper surface of the guide plate is positioned above the straight line connecting the points within a range of 1 mm to 5 mm (claim 1).

More specifically, the top roller of the back roller is composed of a roller member, an apron, and a cradle which presses the apron together with the guide plate, and the cradle presses the apron against the guide plate via a fiber bundle. A spacer is provided for abutting on the guide plate to adjust the pressing force (claim 2). Further, the spacer is detachably attached to the cradle (claim 3).

In the present application, a main draft zone is formed between a pair of top and bottom front rollers and a second roller in which both the top and bottom are apron rollers.
A back draft zone is defined between the second roller and the back roller, a top roller of the back roller is defined as an apron roller, and a bottom roller thereof is defined as a stripe roller. The apron of the back roller is defined between the stripe roller and the bottom apron roller of the second roller. In a three-line drafting device of a spinning machine provided with a guide plate that presses against the lower surface of the apron of the roller, the upper surface of the guide plate has a first guide surface including a vertex that presses against the lower surface of the apron and a fiber bundle on the back roller side from the vertex. A second guide surface for smoothly guiding toward the apex, wherein the apex of the guide plate is located at an upper part in a range of 1 mm to 5 mm with respect to a straight line connecting a nip point of the fiber bundle of the second roller and the back roller. (Claim 4).

[0007]

Next, an embodiment of the present invention will be described with reference to FIGS. Reference numeral 1 denotes a three-line drafting device of a spinning machine, which is configured in substantially the same manner as that disclosed in JP-A-8-144134. Between a plurality of roller stands (not shown) arranged at an equal pitch in the machine base longitudinal direction,
A pair of top and bottom front rollers 2 and 3, second rollers 4 and 5, and back rollers 6 and 7 are disposed in this order from the front of the machine. The front top roller 2 is a rubber roller whose outer periphery is covered with rubber, and the front bottom roller 3 is an iron strip roller. The second rollers 4, 5 are apron rollers in which aprons 8, 9 are wound around roller members (rotating rollers) 4a, 5a.
The back top roller 6 is an apron roller in which an apron 10 is wound around a roller member 6a, like the second rollers 4 and 5, and the back bottom roller 7 is an iron strip roller. The space between the front rollers 2, 3 and the second rollers 4, 5 is in the main draft zone 11,
A back draft zone 12 is provided between the second rollers 4 and 5 and the back rollers 6 and 7.

The bottom front roller 3, the second roller 5, and the back roller 7 are rotatably supported by a front portion of a roller stand (not shown), a second slide, and a back slide, respectively, and are connected to a drive transmission system (not shown). And the second roller 5 and the back roller 7 are
The rotation of the drive transmission system can be changed by changing gears and the like, and the draft amount of the draft zones 11 and 12 can be changed. In addition, each draft zone 11, 1
The roller gauge in 2 is adjusted by adjusting the position of the second and back slides in the front-rear direction.

A top front roller 2, a second roller 4 and a back roller 6 are rotatably supported by a well-known top arm (not shown), and each of the top rollers 2, 4, and 6 corresponds to a corresponding bottom roller. It can be pressed into and out of 3, 5, and 7. The apron 10 of the back-top roller 6 is wound around a cradle 13 and
a is formed at an acute angle. The tip curved portion 10a is brought as close as possible to the second rollers 4 and 5 so that the distance from the nip point between the back-top roller 6 and a guide plate 14 to be described later to the nip point N1 of the second rollers 4 and 5 is made as small as possible. In addition, the fiber bundle (for example, sliver or roving) S is surely transported without floating between the nip point N1 between the back-top roller 6 and the guide plate 14, and the second roller 4 , 5 and the back rollers 6, 7, the distance by which the fiber bundle S is clamped and conveyed between the guide plate 14 can be increased. This back top roller 6
The distance between the back top roller 6 and the back bottom roller 7 to the nip point N2 is slightly shorter than the length of the fiber constituting the fiber bundle S, and the nip point N1 is the nip point N2. Is preferably set to be slightly longer than the length of the fiber constituting the fiber bundle S.

The cradle 13 is provided between adjacent roller members 6a, 6a, and is guided by a spring member (not shown) between the guide portion 15 and the apron roller 6 on the left and right sides. Extending towards
The roller member 6a presses against the inner peripheral surface of the apron 10 and applies a proper tension to the apron 10 to form a tensioner 16. The guide part 15 of the cradle 13 is provided with a distance clip 17 as a spacer disposed between the guide part 14 and the guide plate 14. The distance clip 17 is detachably attached to the lower end of the guide portion 15, and comes into contact with the contact surface 14 b on the upper surface of the guide plate 14 to press the apron 10 against the guide plate 14 via the fiber bundle S. Adjust the force.

The guide plate 14 is disposed below the apron 10 between the second bottom roller 5 and the back bottom roller 7 in the back draft zone 12. The upper surface of the guide plate 14 has a shape that bulges upward, and includes a first guide surface 14 a having an apex 14 </ b> A pressed against the lower surface near the tip of the apron 10, and an apex 14.
A contact surface 14b against which the distance clips 17 of the second rollers 4 and 5 can abut against
The fiber bundle S on the back rollers 6 and 7 side to the vertex 14A
And a second guide surface 14c for guiding smoothly toward. The vertical position of the back top roller 6 is determined by the contact between the contact surface 14b and the distance clip 17, and the holding pressure suitable for the fiber bundle S on which the apron 10 of the back top roller 6 is drafted is applied to the first guide surface 14a. The first guide surface 1 is pressed with a predetermined pressing force so that
The fiber bundle S is sandwiched between the apron 4a and the apron 10. With this distance clip 17, the pressing force of the apron 10 against the guide plate 14 can be adjusted, the holding pressure of the drafted fiber bundle S becomes an appropriate pressure, and the floating fiber of the fiber bundle S can be suppressed and controlled, and a high quality yarn can be obtained. Can be spun. The guide plate 14 extends in the machine base longitudinal direction, and both ends are attached to a back slide (not shown) by a suitable method so that the height position of the vertex 14A of the first guide surface 14a can be adjusted. Guide plate 14
May be made of metal or synthetic resin. Reference numeral 18 denotes a trumpet that converges the fiber bundles S one by one, and 19 denotes a collector disposed between the front rollers 2 and 3 and the second rollers 4 and 5.

The apex 14A of the guide plate 14, which is pressed against the lower surface of the apron 10, is located above the straight line connecting the nip point N1 of the second rollers 4, 5 and the nip point N2 of the back rollers 6, 7 by 1 mm to 5 mm. positioned. The range in which the vertex 14A of the guide plate 14 is located has been obtained from a test. 4 and 6 show the fiber bundle S
Height of the guide plate 14 with respect to a straight line connecting the nip points N1 and N2 of the second rollers 4 and 5 and the back rollers 6 and 7 under different spinning conditions with different weights and total drafts, respectively. Dimension L (mm)
Is a graph showing the average deviation U (%) of the yarn when the value is changed (representing the variation in the thickness unevenness of the yarn, the smaller the value, the smaller the unevenness of the thickness and the better the yarn quality). The spinning conditions in FIG. 4 are such that a fiber bundle having a weight of 375 gr / 30 yd is spun as a spun yarn having a total draft of 75 times and a weight of 20 gr / 120 yd and having a yarn count of 50. The spinning conditions in FIG. 6 are such that a fiber bundle having a weight of 600 gr / 30 yd is spun as a 50th spun yarn having a weight of 20 gr / 120 yd with a total draft of 120 times. FIG. 5 is a graph showing the number of broken yarns (length / 1000 weight / hour) when the height L (mm) is changed under the same spinning conditions as in FIG. 4, and FIG. 7 is the same as FIG. It is a graph which shows the number of thread breakage (line / 1000 weight / hour) when height dimension L (mm) was changed under spinning conditions. 4 and 6, the average deviation U of the yarn is relatively stably small when the height L is about 1 mm to about 7 mm.
It can be seen that when it is smaller than mm, it becomes larger rapidly.
In FIGS. 5 and 7, the number of thread breaks is 5 mm in height L.
It can be seen that it is small in the following cases and increases rapidly when it exceeds 5 mm. From this, it was found that if the height L was in the range of 1 mm to 5 mm, the yarn quality could be improved. The height L is selected as a suitable value according to the fiber bundle S to be drafted within a range of 1 mm to 5 mm.

[0013]

As described above, according to the present invention, the height position of the upper surface of the guide plate is located above the straight line connecting the respective nip points of the second roller and the back roller in the range of 1 mm to 5 mm. Further, the suppression of floating fibers can be effectively controlled, and the yarn quality can be improved.

[Brief description of the drawings]

FIG. 1 is a side view of a draft device of a spinning machine of the present invention.

FIG. 2 is a front view of a back roller.

FIG. 3 is a side sectional view showing a shape of a guide plate.

FIG. 4 is a graph showing the relationship between the height dimension and the average deviation of the yarn.

FIG. 5 is a graph showing the relationship between the height dimension and the number of thread breaks.

FIG. 6 is a graph showing the relationship between other height dimensions and the average deviation of yarn.

FIG. 7 is a graph showing the relationship between other height dimensions and the number of thread breaks.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Draft device 2, 3 Front roller 4, 5 Second roller 6, 7 Back roller 6a Roller member 10 Apron 11 Main draft zone 12 Back draft zone 13 Cradle 14 Guide plate 14A Apex 14A First guide surface 14c Second guide surface 17 Distance Clip (spacer) N1, N2 Nip point S Fiber bundle

Claims (4)

[Claims] 1. A main draft zone is formed between a pair of top and bottom front rollers and a second roller having both top and bottom apron rollers, and a back draft zone is formed between the second roller and the back roller. A three-line spinning machine in which a roller is an apron roller and a bottom roller is a streak roller, and a guide plate is provided between the streak roller and the bottom apron roller of the second roller to press the apron under the apron roller of the back roller. A drafting device for a spinning machine, wherein an upper surface of a guide plate is located above a straight line connecting a nip point of a fiber bundle of a second roller and a back roller in a range of 1 mm to 5 mm. 2. The top roller of the back roller is composed of a roller member, an apron, and a cradle which presses the apron together with the guide plate. The cradle exerts a pressing force for pressing the apron against the guide plate via the fiber bundle. 2. A drafting device for a spinning machine according to claim 1, further comprising a spacer which abuts on a guide plate for adjustment. 3. The drafting device for a spinning machine according to claim 2, wherein the spacer is detachably attached to the cradle. 4. A main draft zone between a pair of top and bottom front rollers and a second roller having both top and bottom apron rollers, and a back draft zone between a second roller and a back roller. A three-line spinning machine in which a roller is an apron roller and a bottom roller is a streak roller, and a guide plate is provided between the streak roller and the bottom apron roller of the second roller to press the apron under the apron roller of the back roller. In the drafting device of the formula, the upper surface of the guide plate has a first guide surface including an apex pressed against the apron lower surface and a second guide surface for smoothly guiding the fiber bundle on the back roller side from the apex toward the apex. And the straight line connecting the nip points of the fiber bundles of the second roller and the back roller. And wherein the apex of the guide plate is located above in a range of 1 mm to 5 mm.