JPS6338451B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a spinning method, and more particularly to an improvement in a ring spinning process and an apparatus related thereto.

[Conventional technology]

FIG. 7 shows an outline of a conventional ring spinning machine. This ring spinning machine 70 has multiple sets of rollers FR, MR,
Equipped with a draft mechanism 71 made of BR, the supplied roving S (hereinafter referred to as sliver) is drafted by changing the surface speed of each roller, and the fiber bundle F formed thereon (hereinafter referred to as fleece) is drawn on a spindle. The wire passes through a snail wire 73 arranged on the axis of the spindle 72 , is engaged with a traveler 75 on a ring 74 into which the spindle 72 is inserted, and then is wound onto a bobbin 76 on the spindle 72 .

[Problem that the invention seeks to solve]

At this time, a ballooning B1 is formed between the snail wire 73 and the traveler 75, and a secondary ballooning B2 is also formed between the snail wire 73 and the exit nip point 71a of the draft mechanism 71.

Furthermore, the twisting caused by the rotation of the spindle 72 is subject to frictional resistance of the snail wire 73, and therefore the fleece F above the snail wire 73 cannot be twisted sufficiently. The state is shown in FIG. That is, the twist angle T applied to the fleece F (the angle between the center line of the fleece and the twist)
is smaller on the upper side than on the lower spindle side of the snail wire 73, the number of twists per unit length decreases, and this twist angle further decreases as it approaches the nip point 71a, and the triangular portion D formed at the nip point (hereinafter referred to as butterfly) is hardly twisted.

Tension (balloon tension) due to the ballooning B1 and B2 is applied to the fleece F, and this tension increases as the spindle rotation speed increases.In particular, the secondary ballooning B2 directly affects the butterfly D, and the fibers are simply aligned. The butterfly in the stretched state is stretched and the thread breaks. In order to prevent this, the number of twists per unit length above the snail wire 73 should be made close to the number of twists below the snail wire 73, so that the effective twist on the butterfly D should be close to increase the tensile strength. is preferred.

For example, US Pat. No. 2,590,374 is one of the means for this purpose. This is a method in which a rotating roller is disposed between the nip point 71a and the snail wire 73 to abut the fleece, and the rolled out fleece is twisted by the rotating roller. However, the fleece forms secondary ballooning as described above, and the abutment is uncertain.

Other means include, for example, JP-A-57-
There is No. 106728. This uses a vortex flow caused by pressurized fluid (air) to impart false twist to the fleece between the nip point 71a and the snail wire 73. However, when using this method, the fleece must be passed through a false twisting device, which poses a problem when splicing.

In view of this, an object of the present invention is to improve the twisting up to the nip point without causing any hindrance to the yarn splicing operation.

[Means for solving problems]

A first invention for achieving the above object is a first invention.
In the figure, the fleece F is sucked and held close to the feeding point of the draft mechanism 4, and the spindle 5
The aim is to impart twist in the same direction as the twist imparted by the rotation of.

Further, the second invention relates to an apparatus for carrying out the above method, in which the suction twisting mechanism 3 is arranged close to the feeding point of the draft mechanism 4 and facing the fleece F. The suction twisting mechanism 3 includes a suction nozzle 21 that suctions the fleece F through a reticular rotating body 20 that comes into contact with the fleece F. The rotating body 20 rotates in a direction that imparts twist to the fleece F in the same direction as the twist imparted by the rotation of the spindle 5.

[Effect]

By twisting the fleece fed out from the draft mechanism 4, the fleece F is effectively twisted close to the feeding point (nip point 4a). The adsorption also suppresses the formation of secondary ballooning B2.

〔Example〕

1 to 3 relate to a first embodiment of the present invention. The spinning device 1 of the present invention is a well-known ring spinning machine 2.
and a suction twisting mechanism 3 for the fleece F during the spinning process by this ring spinning machine.

The ring spinning machine 2 includes a draft mechanism 4 of a well-known structure that drafts the supplied sliver S, and a ring 7 that engages a spindle 5 equipped with a bobbin 6 and a traveler 12 and that moves up and down. A snail wire 8 for guiding the fleece F is attached on the axis. In order to reduce ballooning and increase speed, the spindle 5 of this example has a so-called head twist structure and is directly driven by a motor M.
The ring 7 is a rotating ring, and the fleece F drawn out from the draft mechanism 4 passes through the snail wire 8 and engages with a chrysanthemum-shaped head 10 attached to the upper part of the spindle 5, and then passes through the thread guide shaft several times. 11
is wound onto the bobbin 6 via the traveler 12 running on the ring 7.

As shown in FIGS. 2 and 3, the suction twisting mechanism 3 includes a mesh-like rotating body 20 and a suction nozzle 21 housed within the mesh-like rotating body. The net-like rotating body 20 has flanges 23 and 24 attached to the upper and lower ends of a suction body 22 made of wire mesh, etc., and bearings 25 and 26.
It is rotatably supported by the suction nozzle 21 via a pulley 27 at its lower end, and connected to an appropriate drive means (not shown) via a belt 28.

The suction nozzle 21 is connected to a suitable suction device 31 via a suction duct 30, and
On the opposite side, there is a slit 3 over the entire vertical length.
Open 2. 33 is a mounting bracket for fixing the suction nozzle.

The embodiment of the present invention has the above configuration, and the fleece F drawn out from the draft mechanism 4 is passed through the suction nozzle 2.
1 comes into contact with the net-like rotating body 20, and twisting is performed by the rotation of this rotating body 20.
However, this rotating body rotates in a direction that imparts twist to the fleece F in the same direction as the twist imparted by the spindle 5. As a result, the twisting caused by the rotation of the spindle 5 is obstructed by the snail wire 8, and the upward twisting is not sufficient.
The length of the triangular portion D in the figure can be measured.

However, the rotational speed (surface speed) of the reticulated rotating body 20
In other words, if the number of twists per unit length given to the underside of the fleece is greater than the number of twists by the spindle 5, it becomes false twisting and causes uneven twisting, which is undesirable, and the number of twists should be set as appropriate based on experimental results. .

In addition, this number of twists, that is, the twist angle T in Fig. 6
It is preferable that the number of twists is small (small number of twists per unit length) in the portion leaving the nip point 4a, and gradually increases (large number of twists) as it goes downward. The suction nozzle shown in Figure 4 is designed to achieve this purpose.
The suction nozzle 40 has a slit 4 divided into a plurality of sections.
1a, 41b, . The slit 4 at the bottom becomes longer as it goes to the side.
This is the longest version of 1a. As a result, the part of the fleece F facing the lower slit 41a is strongly attracted to the net-like rotating body 20 and twisted, and the suction force becomes weaker as it reaches the upper part of the fleece F, and even when the rotating body 20 rotates, it does not slip. As a result, the number of twists decreases.

Next, FIGS. 5 and 6 show a second embodiment. In this example, the amount of rolling (twisting) applied to the fleece F to be paid out is gradually increased from the feeding side toward the bottom. That is, the suction twisting mechanism 51 provided in the spinning device 50 of this example has a reticulated rotating body 52 shaped like a truncated cone, and has a suction nozzle 53 inside.
Equipped with. The net-like rotating body 52 has a large diameter portion 52a located on the snail wire 8 side, and has upper and lower flanges 54, 55.
suction nozzle 53 via bearings 56 and 57
A belt 59 is wound around a pulley 58 formed at the bottom and rotated.

The cross-sectional shape of the suction nozzle 53 is substantially the same as that of the previous example, and a slit 60 is bored facing the fleece F side. The rest of the structure is the same as in the previous example, and the same parts are given the same reference numerals and explanations will be omitted.

According to this embodiment, the circumferential speed of the mesh-like rotating body 52 is different between the upper and lower parts, and accordingly, the fleece F
The rolling speed is different. Therefore, the twist angle T2 on the snail wire 8 side is set larger than the twist angle T1 on the side where the fleece F is fed out. In other words, the number of twists of the fleece F gradually increases as it goes downwards, approaching the number of twists caused by the spindle, and the number of twists does not occur due to the sequential increase in the number of twists.
Moreover, the twist up to the butterfly B can be performed effectively.

〔Effect of the invention〕

According to the present invention, since the fleece drawn out from the draft mechanism is attracted to the fleece and twisted in the same direction as the twisting from the spindle side, the necessary twisting can be performed up to the nip point of the draft mechanism. At the same time, secondary ballooning above the snail wire, which occurs when the spindle rotates at high speed, is also suppressed by suction, thereby making it possible to prevent yarn breakage. Further, since the suction twisting mechanism in the second aspect of the invention is only provided to face the fleece fed out from the draft mechanism, it has the advantage that it does not interfere with the yarn splicing operation.

[Brief explanation of the drawing]

1 to 4 relate to the first embodiment of the present invention, FIG. 1 is an overall explanatory diagram of the spinning apparatus of the present invention, and FIG.
The figure is a longitudinal sectional view of the suction twisting mechanism, Figure 3 is a sectional view taken along the line X-X in Figure 2, Figure 4 is a front view showing a modified example of the suction nozzle, and Figures 5 and 6 are Regarding the second embodiment, Fig. 5 is an overall explanatory diagram of the spinning device, Fig. 6 is an explanatory diagram of the operation of the suction twisting mechanism, Fig. 7 is an explanatory diagram of a conventional ring spinning machine, and Fig. 8 is an illustration of the draft mechanism. It is an explanatory view showing the twisting situation of the fleece which is let out. 1,50 is a spinning device, 2 is a ring spinning machine, 3,
51 is an adsorption twisting mechanism, 4 is a draft mechanism, 5 is a spindle, 6 is a bobbin, 8 is a snail wire, 2
0 and 52 are mesh-like rotating bodies, and 21 and 53 are suction nozzles.

Claims (1)

[Scope of Claims] 1. A ring spinning machine in which a supplied sliver is drafted by a draft mechanism to form a predetermined fleece, twisted by a rotating spindle, and then wound onto a bobbin attached to this spindle. A spinning method characterized in that the fleece being paid out is adsorbed close to a point where the fleece is being paid out, and the fleece is given a twist in the same direction as the twist from the spindle side. 2. The spinning method according to claim 1, wherein the twisting angle of the fleece is gradually increased from the feeding side to the spindle side of the draft mechanism. 3. In a ring spinning machine in which the supplied sliver is drafted by a draft mechanism to form a predetermined fleece, twisted by a rotating spindle, and then wound onto a bobbin attached to this spindle, A suction twisting mechanism is disposed opposite to the fleece, and the suction twisting mechanism includes a net-like rotating body that contacts the fleece, and a suction nozzle that is housed in the rotating body and sucks the fleece through the rotating body. A spinning device characterized in that the rotating body imparts twist to the fleece it comes into contact with in the same direction as the twist from the spindle side. 4. The spinning device according to claim 3, wherein the suction twisting mechanism is arranged between the draft mechanism and the snail wire arranged on the spindle axis. 5. The spinning device according to claim 3, wherein the suction nozzle faces the fleece and is provided with a suction slit in the longitudinal direction of the fleece. 6. The spinning device according to claim 5, wherein the slit provided in the suction nozzle is divided into a plurality of sections in the longitudinal direction, and the suction pressure of each section is varied according to the twisting angle. 7 The net-like rotating body has a truncated conical shape, and the large diameter part is located on the spindle side and the small diameter part is located on the feeding side of the draft mechanism, so that the rolling speed against the fleece is slow on the feeding side and reaches the lower spindle side. The spinning device according to claim 3, wherein the spinning device is sequentially increased in speed according to the following.