JPH036253B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and device for drafting fiber bundles in a spinning machine, and more particularly to focusing of fiber bundles in a draft area.

[Prior Art] As a drafting device for supplied fiber bundles (hereinafter referred to as slivers), there is a method in which a plurality of bottom rollers with different surface speeds are arranged in parallel, a top roller is pressed against each of them, and the supplied sliver is drafted. is widely used. An example of that method is shown in the first
Shown in Figure 0. The figure is a schematic diagram of a ring spinning machine equipped with a draft device 100 consisting of three pairs of rollers.
1. A back bottom roller 102, an intermediate bottom roller 103, and a top roller 10 for each.
4, 105, 106 are pressed together, and the intermediate roller 10
Aprons 107 and 108 are attached to 3 and 106. In the figure, 109 is a trumpet for introducing the sliver S, and 110 is a collector.

The supplied sliver S is drafted by the difference in surface speed of each roller, and the sliver S is drafted by the front roller 101,
A bobbin 1 is unwound from a spindle 104, twisted by a well-known spindle twisting means 111 by a traveler 114 running on a spindle 112, a ring 113, and a ring 113, and mounted on the spindle.
In the roller/apron type drafting mechanism, which involves repeatedly nipping a pair of parallel rollers, the width of the supplied fleece gradually increases in each draft zone.
It is well known that not only yarn unevenness or fluff occurs, but also the so-called butterfly as described later occurs, which impedes the run-up of the twist by the spindle twisting means following the draft mechanism, and causes yarn breakage.

Conventionally, this solution has been to use collectors to converge the sliver, and to reduce butterflies by adjusting the so-called fleece angle. In addition, as described in "Basic Textile Engineering" published by the Japanese Society of Textile Machinery Engineers in 1966, techniques such as twisted draft, twisted super high draft, and umbra super draft are known. Other methods have also been proposed in which the sliver is falsely twisted by airflow in the draft area (for example, Japanese Patent Laid-Open No. 58-31123).

[Problems to be Solved by the Invention] The method using the collector described above may generate fuzz due to frictional resistance. Other methods, such as twist draft or air flow, have problems such as having a complicated structure and requiring time and effort to thread the thread.

There is no problem with either method at a spinning speed of about 20 to 30 m/min, but recently there has been a demand for a speed several times higher than the above-mentioned spinning speed. When the roller is rotated at high speed, the air current generated thereby affects the sliver being drafted, causing problems such as fluffing and other disturbances, such as winding around the roller. This has a particularly large effect on the front bottom roller, which rotates at the highest speed, and the front top roller, which is disposed opposite thereto.

Furthermore, as shown in FIG. 11, the sliver S is twisted up from below and expanded during drafting to form a triangular portion B from the front roller.
(hereinafter referred to as butterfly). The lower twisted part has high tensile strength, but Butterfly B
is in an open state and has a low tensile strength due to its flatness.
This is the point where thread breakage occurs, but there are problems in that the width cannot be made narrower and therefore the twisting cannot be brought closer to the nip point.

In view of this, an object of the present invention is to make the width of the sliver at the delivery portion from the front roller as narrow as possible. Still another object is to prevent disturbances such as fluffing of the sliver due to air currents generated due to the rotation of the rollers even when the speed of the spinning machine is increased.

[Means for Solving the Problems] A method for drafting fiber bundles in a spinning machine according to a first invention for achieving the above object will be described with reference to FIG. 1 corresponding to the first embodiment. The draft device 1 of the spinning machine includes a plurality of pairs of upper and lower rollers that rotate while nipping the supplied sliver S, such as a front roller FR, a back roller BR, and a first intermediate roller MR.
1 and a second intermediate roller MR2. The method of the present invention described above includes a gas permeable membrane 21 that moves directly to the sliver S running behind the front roller FR, and presses the sliver S against the gas permeable membrane 21 by suction. Then, by running the ventilation membrane 21, the sliver S
It is characterized by rolling and twisting.

The second invention relates to an apparatus for achieving the above method, and includes an adsorption twisting means 20 located behind the front roller FR. This suction twisting means 20 includes a ventilation film 23 that is in contact with the sliver S and moves perpendicular to the sliver running direction, and a suction nozzle 22 that is located below this film and absorbs the sliver S through the ventilation film 23. .

[Function] The running sliver S is sucked into the ventilation membrane 2.
1 and moving the ventilation membrane 21 perpendicularly to the travel of the sliver S, the sliver S is rolled,
This allows the sliver S to be twisted. Accordingly, the width of the butterfly formed at the exit of the front roller FR can be reduced, and the cross section of the sliver can be made circular.

[Embodiment] FIGS. 1 to 3 show a first embodiment of the present invention. A draft device 1 of a spinning machine includes a front bottom roller 2, a back bottom roller 3, first and second intermediate bottom rollers 4, 5, which are in pressure contact with top rollers 6, 7, 8, 9, and a second intermediate bottom roller. 5 and the corresponding top roller 9 are provided with aprons 10 and 11, respectively. Hereinafter, the front bottom roller 2 and the top roller 6 corresponding thereto will be collectively referred to as the front roller FR, hereinafter similarly referred to as the back roller BR, the first intermediate roller MR1, and the second intermediate roller MR1.
It is called intermediate roller MR2. In the figure, 12 is a trumpet for receiving the sliver, and 13 is a collector.

The draft device 1 of the present invention is a front roller FR.
Adsorption twisting means 2 on the rear side, that is, on the supply side of the sliver S
Deploy 0. The suction twisting means 20 includes a rotating body 21 that is in contact with the sliver S and rotates perpendicularly to the running direction of the sliver S, and a suction nozzle 22 housed within the rotating body 21. The rotating body 21 has flanges 24 and 25 attached to both ends of a cylindrical ventilation membrane 23 such as a wire mesh, is rotatably supported by the suction nozzle 22 via bearings 26 and 27, and has a pulley 28 at one end. , are connected to appropriate driving means (not shown) via a belt 29.

The suction nozzle 22 is connected to an appropriate suction device (not shown) via a suction duct 30, and the sliver S
The opposite side is adjacent to the ventilation membrane 23 and has a slit 31 formed therein. 32 is a bracket for fixing the suction nozzle.

In the figure, 33 is a well-known spindle twisting mechanism mainly consisting of a spindle 34, and the fleece F drawn to a predetermined thickness and fed out from the front roller FR is passed through a snail wire 38 to a traveler running on a ring 35. 36, and is twisted and wound onto a bobbin 37 fitted into a spindle 34.

The present embodiment has the above-described configuration, and the sliver S sent out from the first intermediate roller MR1 is tension-drafted between the front roller FR rotating at high speed, and is sucked by the suction nozzle 22 to cause ventilation to run in the right angle direction. It comes into contact with the membrane 23 and is adsorbed and twisted. Although the twisting is generally false twisting, the sliver S is rotated and focused into a nearly circular shape. Therefore, even if an air current is generated due to the rotation of the roller, it is possible to prevent the occurrence of fuzz, etc. Further, by providing the suction twisting means 20, the air current generated due to the rotation of the bottom roller 2 and the top roller 6 is absorbed by the suction twisting means 20 and does not reach the sliver S.

Since the sliver S is fed out from the front roller FR in a focused state by adsorption and false twisting, the sliver S is
The width of the butterfly B shown in the figure is narrow, so it is possible to measure the twist up close to the nip point.

Note that the sliver S due to the rotation of the ventilation membrane 23
The twisting direction is the same as the twisting direction by the spindle 34.

Next, FIGS. 4 to 6 show a second embodiment. Similar to the first embodiment, the draft device 40 of this embodiment uses a four-wire roller system including a front roller FR.
1 will be deployed. This suction twisting means 41 includes a ventilation film 42 such as a wire mesh that is in contact with the sliver S and moves perpendicularly to the running direction of the sliver S, and a suction nozzle 43 arranged below the ventilation film 42 . This suction nozzle 43
is connected to a suitable suction means (not shown), and a slit 44 is bored in the upper surface.

The ventilation membrane 42 may have an endless shape, and may be laid and run over the entire length of the machine. Alternatively, it may be provided separately for each staff (4 to 8 staffs) and run each. In this case as well, the running direction of the ventilation membrane 42 is the direction in which the sliver S is rolled in the same direction as the direction in which the yarn is twisted by the rotation of the spindle.

In addition, the suction nozzle 43 provided for each plow is as follows.
If necessary, they may be connected to each other by connecting rods 45 and moved back and forth to the left and right in conjunction with the left and right traverse of the sliver S.

In the figure, 46 is a support roller that supports the gas permeable membrane 42, and other parts that are the same as those of the first embodiment are given the same reference numerals and explanations will be omitted.

FIG. 7 shows a modification of the suction nozzle. Each slit 3 of each of the above-mentioned suction nozzles 22 and 43
Reference numerals 1 and 44 indicate suction nozzles 5 shown in FIG.
The 0 slit 51 is provided at an angle with respect to the running of the sliver S. By appropriately selecting this inclination angle α, the sliver S rolls due to the running of the ventilation membrane 52 in the direction of the arrow, and a pushing force is generated against the sliver S in the direction of the arrow.

Next, FIGS. 8 and 9 show a third embodiment. In this embodiment, a part of the sliver twisted by the suction twisting means is fed out through the nip point of the front roller. That is, the suction twisting means has, for example, the structure of the first embodiment, and the front roller FRa consists of a normal bottom roller 55 and a top roller 56 having a soft pressure structure. As for the soft pressure structure, for example, as shown in the figure, the outer cylinder part 57 is made of soft rubber and has a hollow part 58 formed therein. This applies soft pressure to the sliver S, allowing part of the twist to come out.

In each of the above embodiments, the draft device is a four-wire roller type, and the aprons 10 and 11 are provided with second intermediate rollers.
Although an example has been shown in which an adsorption twisting means is provided in MR2 and between the first intermediate roller MR1 and the front roller FR, for example, a three-wire roller type shown in FIG. 10, etc.
When the apron is provided at the rear of the front roller, the suction twisting means may be provided between the free gauge between the tensioner 14 for tensioning the apron and the nip point of the front roller. Of course, changes can be made as appropriate without departing from the spirit of the invention.

[Effects of the Invention] According to the present invention, since the supplied sliver is focused during drafting, fluffing and turbulence due to airflow caused by the rotation of the rollers does not occur. In addition, since the yarn is fed to the front roller in a concentrated manner, the width of the butterfly formed when it is sent out from the front roller is narrow, and the twisting by the balloon can be measured up to the nip point, thereby preventing yarn breakage. It has the following effects.

[Brief explanation of drawings]

1 to 3 relate to the first embodiment, FIG. 1 is an overall explanatory diagram, FIG. 2 is a vertical sectional view of the suction twisting means, and FIG. 3 is a sectional view taken along the - line in FIG. 4 to 6 relate to the second embodiment, and the fourth embodiment
The figure is an overall explanatory diagram, and Figure 5 is the same as Figure 4.
A cross-sectional view along the line, Fig. 6 is - in Fig. 4.
A plan view of the suction twisting means along a line, FIG. 7 is an explanatory diagram showing a modified example of the suction nozzle, FIGS. 8 and 9 are related to the third embodiment, and FIG. 8 is a longitudinal cross-sectional diagram of the main part.
FIG. 9 is a sectional view taken along the - line in FIG.
FIG. 10 is an overall explanatory diagram of a conventional draft device;
FIG. 11 is an explanatory diagram of the procedure for feeding out the sliver from the front roller. 1 and 40 are draft devices, 20 and 41 are suction twisting means, 28, 42 and 52 are ventilation membranes, 22 and 4
3 and 50 are suction nozzles, FR and FRa are front rollers, and S is a sliver.

Claims (1)

[Scope of Claims] 1. A method for drafting a fiber bundle in a spinning machine in which a supplied sliver is drafted by two or more pairs of upper and lower rollers that rotate while nipping the sliver,
Features include a ventilation film that moves perpendicularly to the running sliver from the apron onwards, the sliver is pressed against the ventilation film by suction, and the running of the ventilation film causes the sliver to roll, false-twist, converge, and send out to the front roller. A method for drafting fiber bundles in a spinning machine. 2. A fiber bundle in a spinning machine according to claim 1, characterized in that the gas permeable membrane is disposed in a free gauge between the front roller and the apron, and false twists the sliver fed out from the apron. Draft method. 3 The ventilation membrane is placed behind the front roller,
A method for drafting a fiber bundle in a spinning machine according to claim 1, characterized in that the sliver fed out from the front rollers is false-twisted. 4. The method of drafting a fiber bundle in a spinning machine according to claim 3, wherein the direction of false twisting of the sliver by the ventilation membrane is the same direction as the direction of twisting by the main twisting means on the front roller side. 5. The method of drafting a fiber bundle in a spinning machine according to claim 3, wherein a part of the false twist of the sliver due to the running of the gas permeable membrane passes through the nip point of the front roller and is fed out. 6. A fiber bundle drafting device in a spinning machine that drafts a supplied sliver with two or more pairs of upper and lower rollers that rotate while nipping the supplied sliver,
An adsorption false-twisting means is provided after the apron, and the adsorption false-twisting means suctions a gas permeable film that moves perpendicularly to the sliver travel, and the sliver that runs on this gas permeable film, presses it against the gas permeable film, and presses the sliver against the gas permeable film. 1. A drafting device for a fiber bundle in a spinning machine, comprising a suction nozzle disposed close to the bottom of a gas permeable membrane to impart rolling false twist to the sliver. 7 The suction twisting means is equipped with a cylindrical rotating body whose body is covered with a ventilation membrane, and a nozzle housed in the body. 7. The fiber bundle drafting device in a spinning machine according to claim 6, wherein a suction action is applied to the sliver through the fiber bundle. 8. A fiber bundle draft device in a spinning machine according to claim 6, wherein the ventilation membrane is an endless band running along the longitudinal direction of the machine frame. 9. A fiber bundle draft device in a spinning machine according to claim 6, 7, or 8, wherein the suction twisting means is disposed in a free gauge between the front roller and the apron. 10. A fiber bundle drafting device in a spinning machine according to claim 6, 7, or 8, wherein the suction twisting means is provided after the front roller. 11. Claim 10, characterized in that the top roller of the front roller has a soft pressure structure, and a part of the twist of the sliver falsely twisted by the suction twisting means passes through the nip point of the front roller and is fed out. A drafting device for a fiber bundle in a spinning machine as described in 2.