JPS5818450B2 - Draft device in spinning equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a draft device in an air spinning device, and more particularly to a by-draft device that omits the roving step.

Generally, drafting is performed by gradually drafting fiber bundles through two steps of a roving process and a spinning process, and the fiber bundles drafted to a certain thickness are supplied to a spinning device to produce spun yarn.

Among these two-stage drafts, the roving process is omitted and the sliver obtained through the filament process is directly spun to obtain yarn, that is, the sliver is supplied to a five-wire thick-wire drafting device, which is several hundred times more efficient. Attempts have been made to perform drafting, but this has not yet been successful.Also, the sliver obtained through the filament process is a thick fiber bundle made of parallelized fibers bundled into a uniform thickness, and is in an untwisted state. The sliver supplied to the raft device is expanded into a flat shape by the contact pressure of the rollers, and the expansion of the fiber bundle is more likely than that of the sliver, and the draft is how to control the abnormal expansion of the fiber bundle. This is an element that prevents unevenness from occurring.

Therefore, especially when drafting sliver using a three-wire idle draft device that omits the roving process, the control of the fiber bundle in the break draft area between the back roller and the middle roller, which is fed to the main draft area, is controlled by the apron. It greatly affects the control of floating fibers.

That is, the sliver fed from the back roller to the middle roller undergoes a certain break draft and tends to expand, and needs to be fed to the middle roller equipped with an apron in a narrowed state.

An object of the present invention is to provide a draft device suitable for the three-wire draft device as described above.

Therefore, it is particularly effective when a sliver is used as a yarn feeder, but it is of course also applicable when a sliver is used as a yarn feeder.

That is, the draft device according to the embodiment of the present invention has a cylindrical sliver guide arranged between a back roller and a middle roller, and the sliver guide has a sliver inlet and an outlet having a width smaller than that of the inlet. The guide is surrounded by a substantially cylindrical wall between the sliver inlet and the outlet, and the cross-sectional area gradually decreases from the sliver inlet to the outlet, in the left and right middle or in the top and bottom. A groove for passing the sliver can be carved in the sliver, and the sliver inlet has a width and height that can receive all the sliver that has been pressed by the back roller and spread out into a flat shape, and the sliver inlet has a width and height that can receive all the sliver that has been pressed by the back roller and has been spread flatly. It has a cylindrical wall suitable for conveying the fibers of the sliver in parallel without hooking, and the guide outlet is placed as close to the nip point of the middle roller as possible, and the guide inlet is placed as close to the nip of the back roller as possible. This will be explained below with reference to the drawings.

In Fig. 1, a sliver S drawn out from a can 1 is fed to a back roller 3 via a condenser 2, and the sliver spread flat due to the contact pressure of the back roller 3 is kept in a constant amount by a substantially cylindrical guide G. The squeezed product is fed to a middle roller 5 equipped with an apron 4.

The floating fibers are controlled by the apron 4 and fed to the front roller 6 which rotates at high speed, and a main draft is performed between the middle roller and the 70mm roller. The spun yarn Y is supplied to a nozzle 7 and a second air nozzle 8, and is drawn out by a feed roller 9 as a spun yarn Y. While being traversed by a traverse guide 10, it is wound onto a winding bobbin P which is driven in surface contact with a drum 11.

That is, the sliver drawn out from the can 1 is passed through three rollers 3.
, 5 and 6 are gradually drafted according to the difference in circumferential speed, and the spun yarn is obtained by being drafted by draft without going through the roving process.

In the spinning using two air nozzles as described above, the front roller 6 also has a large effect on the triangular portion (Z in FIG. 1) of the fibers being sent out and the yarn being produced.

Therefore, the above-mentioned triangular width is regulated by the width of the sliver supplied to the apron 4, and it is desirable that the sliver sent out from the back roller is appropriately squeezed depending on the spun yarn count before being supplied to the apron. 3,5,
7 nip point air nozzles 7.8 are arranged to be essentially collinear.

Next, an embodiment of the sliver guide G will be described with reference to the drawings.

2 and 3 show a first embodiment of the guide according to the present invention, in which the outlet 12a and the inlet 12b are square, the bottom plate 13,
It has a cylindrical wall whose periphery is closed by the upper plate 14 and side plates 15 and 16, and is formed as a single piece so that the passage cut at right angles to the sliver traveling direction gradually decreases in the sliver traveling direction.

FIGS. 4 and 5 show a second embodiment, in which the outlet 17a is an ellipse similar to the inlet 17b, and a cylindrical wall whose periphery is closed by a circumferential plate 18 is formed, forming an elliptical passage; The outlet 17a is narrower than the inlet 17b, and the width of the outlet is regulated.

FIGS. 6 and 7 show a third embodiment, in which the guide 19 has an inlet 19a and an outlet 19b which are circular, and a truncated conical wall 20 in the middle, which is formed into a cylindrical shape.

Furthermore, FIG. 8 shows a fourth embodiment of the guide 2 in which a slit 22 for passing the sliver is formed on the upper surface of a square cylindrical wall 121.
3, it is carved parallel to the sliver traveling direction,
FIG. 9 shows a guide 25 in which a slit 24 is cut diagonally.

Furthermore, in FIG. 10, a part of the guide 26 formed by bending is not overlapped, but a gap 27 is provided to form a sliver passage slit, and the outlet and inlet have the same relationship as in the above embodiment.

FIG. 11 shows a hinge 3 that allows the upper surface 29 of the guide 28 to be opened and closed.
It is fixed at 0, etc., and is convenient for removing if it gets stuck inside the sliver guide.

Further, in FIG. 12, a parallel portion 35 is formed in the vicinity of the exit of the guide 34 to reduce the spread of the sliver coming out from the exit.

Such approximately cylindrical guides 12, 17, 19°23.25
．． 26.28.34 back roller 3 and middle low 25
However, if the exit width of the guide is too wide, the fiber bundle will spread out too much in the draft area, worsening the uniformity of the spun yarn, and if it is too narrow, the fibers will become densely packed. As a result, the number of contact points between fibers increases, and the rate at which floating fibers removed by the draft are accelerated by the surrounding high-speed fibers increases, leading to the risk of uneven drafting.

For this reason, it is necessary to change the exit width depending on the spun yarn count.

That is, it is necessary to change the degree of narrowing of the guide, and therefore, for example, the side plates 15 and 16 of the rectangular guide shown in the second figure are
It is necessary to use a guide with a changed zero inclination angle.

Therefore, when the supplied sliver is kept constant, changing the degree of narrowing of the guide 12 means changing the inclination angle of the cylindrical wall, and if the inclination angle is too large, the ends of the single fibers in the sliver sent out from the back roller will There is a risk that the fibers will hit the cylindrical wall and become hooked, disrupting the direction of the fibers.

Therefore, the inclination angle of the guide of the present invention is within the range shown in FIG.

That is, in Fig. 13, BR is the nip point of the back roller, MR is the nip point of the middle roller, and NP is the nip point of the tip of the apron, and the sliver spread flat by the back roller can be sufficiently received at the entrance of the guide. If the amount of sliver to be supplied and the contact pressure of the back roller are constant, the width at the entrance of the guide may be constant, as shown in FIG.
The angles of b, 15 c t 16 c are set so that the intersection points A, B, and C of the extensions of the straight line connecting the entrance and exit are located between the nip point MR of the middle roller and the nip point NP of the tip of the apron. .

Note that the aperture angle is the same as above for guides with an elliptical or circular cross section, so that the extension of the straight line connecting the inlet inner circumferential surface and the outlet inner circumferential surface is between the middle roller nip point MR and the apron tip nirup point NP. It is formed.

Furthermore, the mounting position of the above guide is guide 3 as shown in Figure 13.
The inlet 31a of the guide 31 is as close as possible to the nip point 3a of the back roller 3, and the outlet 31b of the guide 31 is as close as possible to the nip point 3a of the back roller 3.
It is arranged as close as possible to the nip point 5a of.

That is, in order to make it easier for the short fibers in the sliver sent out from the back roller 3 to be received by the guide and to prevent the fibers from falling, the guide entrance is moved close to the nip point 3a of the back roller. The squeezed sliver tends to spread out immediately after coming out of the guide 31 exit, and if there is a distance between the guide exit and the nip point 5a of the middle roller, the squeezed sliver will spread out before it is nipped by the middle roller. As a result, the fiber bundle spreads too much in the draft area of the apron, resulting in fibers that do not contribute to yarn production, resulting in loss of sliver or yarn with low strength.

Therefore, in order to feed the fiber bundle squeezed by the guide to the middle roller in a squeezed state, the outlet of the guide is arranged as close as possible to the nip point 5a of the middle roller.

For the above reason, the inlet and outlet ends of the guide 31 are formed into arcuate portions 31c in accordance with the curvature of the outer circumferential surface of the roller.

31d is advantageously formed.

Furthermore, when drafting the sliver between the back roller 3 and the middle roller 5, it is desirable that the sliver is not brought into contact with other objects.While both sides of the guide inevitably come into contact during squeezing, the bottom and top surfaces of the guide are in a non-contact state with the sliver. It is located in

That is, the bottom surface 32 is positioned at a certain distance below the sliver feeding surface SL, and the top surface 33 is set at a height so as not to come into contact with the sliver.

In addition, the guide inner wall surface is designed to have a mirror-like surface roughness that provides little resistance to the sliver feeding, or to prevent fiber adhesion such as a satin finish, in order to prevent circular feeding of the sliver and the occurrence of draft unevenness.

Therefore, as the material of the guide, a metal plate processed and surface-treated, a wear-resistant plastic molded product, a titanium molded product, etc. can be selected as appropriate.

Therefore, by disposing the substantially cylindrical sliver guide shown in each of the above embodiments in the sliver transfer path between the back roller and the middle roller, the sliver spread by the back roller 3 is squeezed into a constant state. can be held and fed to the middle roller, thereby reducing draft unevenness due to fiber expansion in the apron and contributing to improving the uniformity of the yarn produced.

Moreover, the sliver squeezed from the left and right by the guide G spreads in the vertical direction of the guide, and there is a risk of overflowing from the guide when there is no upper surface of the guide, but this is prevented by making the guide cylindrical.

Furthermore, the sliver supply when spinning is restarted can be automated. That is, if the back roller is stopped first when spinning is stopped, the sliver end will be between the back roller and the middle and middle rollers, and when spinning will be restarted, it will be guided by the cylindrical guide and placed in the middle. The sliver can be automatically supplied to the roller.

Now, when the yarn was spun under the conditions shown in Table 1 using a sliver or a sliver as a yarn feeder and an air-spinning device using an air injection nozzle, a good quality spun yarn could be obtained.

It is also possible to apply the draft device provided with the guide to a ring spinning machine.

[Brief explanation of drawings]

゛Figure 3 is a cross-sectional view taken along the line A-A in Figure 2, Figure 4 is a perspective view showing the second embodiment of the guide, Figure 5 is a cross-sectional view taken along the line B-B in Figure 4, and Figure 6 is a cross-sectional view taken along the line B-B in Figure 4. FIG. 7 is a sectional view taken along line C-C in FIG. 6, FIG. 8 is a perspective view of the fourth embodiment, and FIG. 9 is a perspective view of the third embodiment. 10 is a perspective view showing the eighth embodiment, FIG. 11 is a perspective view showing the seventh embodiment, FIG. 12 is a perspective view showing the eighth embodiment, and FIG. 13 is a perspective view showing the eighth embodiment. FIG. 14 is an explanatory plan view showing the aperture angle of one side of each sliver, and a longitudinal side view showing the arrangement position of the sliver guide. 3...Back roller, 4...Apron, 5...Middle roller, 6...Front roller, 12,17°19.23,25,2 '6,2
B... Sliver guide, S... Sliver, 31a... Sliver guide entrance (rear end),
31b...Sliver guide exit (tip), I.
...First air nozzle, 8...Second air nozzle, 15 a, , 16 a to 15c, 16c...
... Cylindrical wall of the sliver guide, 31 ... Sliver guide, 32 ... Bottom surface of the guide, 33 ...
...Top surface of guide, A, B, C...Intersection of virtual extension lines of inner wall of cylindrical wall, nip point of dollar roller, N-R
...Nip point at the tip of the apron, SL...
・Sliver running surface.

Claims (1)

[Claims] 1 In a three-wire draft device consisting of a back roller, a middle roller having an apron, and a front roller, which feeds the sliver to an air heating nozzle consisting of two air nozzles, a first air nozzle and a second air nozzle, the back roller and A cylindrical sliver guide whose internal passage gradually decreases in the sliver traveling direction is arranged between the middle rollers, and the sliver guide has a sliver guide whose slanted inner wall intersects with the nip point of the middle roller. The sliver guide has an inclination angle such that it is located between the nip point at the outer end of the apron, and the bottom surface of the sliver guide is positioned at a certain distance below the running surface of the sliver, and the top surface of the sliver guide is positioned between the sliver and the nip point. The sliver guide is positioned at a non-contact height, and further characterized in that the tip of the sliver guide is brought as close as possible to the middle roller, and the rear end is brought as close as possible to the bank roller. A draft device in a spinning machine.