JPH05163621A - Method of centrifugal fine spinning and fine spinning machine - Google Patents

Abstract

PURPOSE: To surely switch a rotary pot by imparting a helical force, which rotates around the longitudinal axis of a fiber bundle between an outlet in a drafting mechanism and a broken end of the fiber bundle, to the fiber bundle. CONSTITUTION: A helical force is imparted to the fiber bundle from let off rollers 1, 2 of the drafting mechanism by an air flow from nozzles 8 within a conduit tube of a let off device 4. A thread pretwisted within the conduit tube 5 is introduced from the conduit tube 6 on the open side through a drawing out device 22 to the centrifugal rotary pot 20 which is positioned in an outlet at the end of an expansion tube 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal spinning method and spinning machine.

[0002]

2. Description of the Prior Art In a centrifugal spinning method, a fiber bundle from a draft mechanism is positioned against a side wall of a rotary pot, and the fiber bundle is immediately upstream of the rotary pot as soon as a certain length of yarn accumulates on the side wall. One of the ends, which is the end of the accumulated yarn of a certain length, is guided to the winding bobbin and the other end is directed to the side wall of the second rotary pot. The fiber bundle is cut as soon as a certain length of yarn is accumulated on the side wall of the second rotary pot, and the above steps are repeated.

Centrifugal spinning is a spinning method proposed by Ferranti in 1904. The advantage of this spinning method is that the problem of friction, which is inevitable with the ring-traveler type spinning method, can be avoided. As a result, it is possible to further increase the spinning speed while ensuring good yarn quality. The drawback of centrifugal spinning is that continuous operation is difficult because the rotary pot must be emptied periodically. In order to prevent interruption of the process during the take-out of the yarn generated in the rotary pot and reduction of the production amount, two rotary pots are provided per spinning unit, and while the first rotary pot is emptied. It has been proposed that the second rotary pot is filled with the first rotary pot and the second rotary pot is filled while the second rotary pot is emptied.

US Pat. No. 3,343,358 discloses a spinning machine which realizes this improved spinning system using two rotary pots per spinning unit. In the spinning machine of this patent, the delivery conduit for the fiber bundle comprises two branch pipes terminating in a rotary pot. Each branch has a device for cutting the fiber bundle and an air means for directing its cut end to the other branch, during operation of this air means the other air means is the first. The other stump, which forms the end of a length of yarn formed in the rotary pot, is led to a withdrawal conduit terminating in a winding device.

[0005]

In this spinning method, the twisting of the yarn is imparted in two stages, when entering the rotary pot and when exiting the rotary pot. That is, the twist of the fiber bundle in the rotary pot is about 50-60% of the final twist.
Since the twist imparted in the first stage is less than the twist induced by the ring-traveller spinning method, the twist does not spread through the fiber bundle and the bonding force between the fibers is lacking. Operation is generally not possible. This is one of the reasons why the method is not put to practical use industrially, despite the advantage of the centrifugal spinning method that high quality yarn can be spun with restraint by avoiding the friction problem of the ring-traveler method. ..

Another problem of this spinning system is that the twist of the free end to be guided to the second rotary pot is lost immediately when the fiber bundle is cut due to the switching of the rotary pot. The disappearance of such twist is that the constraint of the fiber bundle on the rotary pot is no longer released at the time of switching,
As well as the well-aligned, post-draft fiber bundles from the drafting mechanism being unable to withstand the pulling forces required to guide their ends to the second rotating pot. As a result, the spinning process is interrupted each time the rotary pot is changed, and the number of interruptions increases as the fiber bundle length to be accumulated in the rotary pot decreases. Again, there is no doubt that this is another reason why this method is not put to practical use industrially, even though the principle of the centrifugal spinning method was proposed nearly 100 years ago.

Pneumatic air jet spinning is a spinning method which has recently been regarded as promising from the viewpoint of production rate detection. The principle of this method is Milland Textilberi
It appears in the article in Figure 4 on page 324 of chte magazine No. 5, 1989. According to this method, the fiber bundles are captured at the exit of the draft mechanism by a first spiral vortex rotating in a first direction and then by a second spiral vortex rotating in the opposite direction. According to the description of FIG. 3 at page 318 and the same page of the same issue of the Milland magazine mentioned above, in the structure of the yarn produced by this method, the twist is applied only to the surface layer of the yarn, The fibers remain parallel and do not appear to contribute to yarn strength.

An object of the present invention is to provide a centrifugal spinning method which eliminates the above-mentioned drawbacks.

[0009]

A fiber bundle produced by a draft mechanism is accumulated on a side wall of a rotary pot, and the fiber bundle is immediately formed when a yarn of a certain length is accumulated on the wall surface. , One of which forms the end of a length of accumulated yarn, is led to a winding bobbin, the other of which is led to the side wall of a second rotary pot,
The fiber bundle is immediately cut again when a certain length of yarn accumulates on the side wall of the second rotary pot, and in the centrifugal spinning method in which the above steps are continuously repeated, the feature of the present invention is that the draft mechanism exits. And a cut end of the fiber bundle, a helical force rotating about the longitudinal axis of the fiber bundle is applied to the fiber bundle to guide the other end alternately to each wall surface of the rotary pot. At the same time, the fiber bundle is pre-twisted in the axial direction so that the tensile force component applied to the fiber bundle is supported.

Further, a rotary pot for alternately receiving the fiber bundle, a conduit for dividing the fiber bundle into the rotary pot, and a conduit divided into two yarn take-out passages respectively connected to the branch pipes. Means for inducing relative movement between the outlet end of the branch tube and the rotary pot in the axial direction of the rotary pot, means for connection to a fluid source under pressure directed into the conduit for withdrawing the fiber bundle, A cutting means for the fiber bundles arranged at the inlet of each branch pipe, a means for passing the fiber bundles from one branch pipe to the other branch pipe, and a drawing means for drawing the ends of the cut yarns. In the spinning machine described above, the feature of the present invention resides in that the means for guiding the fluid under pressure to the conduit is a nozzle configured to impart a spiral flow to the fiber bundle to simultaneously induce pretwisting and tension. ..

[0011]

In this method, the fiber bundle from the draft mechanism is given a pretwist sufficient to guide it to the rotary pot that causes the original twist. This method allows the fiber bundle to pass from one rotary pot to the lower rotary pot regardless of the yarn cutting that must be done to switch the rotary pot, so that the fiber bundle from the draft mechanism and the fiber The connection between the means for imparting a partial twist to the bundle is eliminated. In this way, the process does not have to be interrupted regardless of the cutting of the yarn and the pretwist imparted to the fiber bundle allows the free end of the yarn to be guided to the other spinning pot during centrifugal spinning. In the first stage, only 60% twist is applied to the yarn, but this pretwisting also replenishes the twist along the fiber bundle from the rotary pot, providing sufficient binding force for the fiber bundle. Then, the fiber bundle is passed through the outlet of the draft mechanism toward the centrifugal rotation pot without breaking.
The yarn is further twisted in the same direction as compared with the air jet type spinning system, and this twist is applied to the fiber aggregate constituting the yarn.

[0012]

EXAMPLE One of the spinning machines shown in FIG. 1 is a centrifugal spinning unit. Only the parts necessary for understanding the present invention are shown, and the structure of the drive mechanism is well known to those skilled in the art, so the illustration thereof is omitted. The device forming part of the spinning machine comprises a pair of delivery rollers 1, 2 for the fiber bundle.
It is equipped with. One of the rollers 2 is connected to a drive shaft 3 which is rotationally driven by the motor mechanism of the spinning machine. Preferably, rollers 1 and 2 form the last roller pair of a draft mechanism (whose overall is not shown).

At the exit of the draft assembly, the fiber bundle enters the delivery device 4. The delivery device 4 is shown in section in FIG. The delivery device 4 comprises a conduit 5, which comprises a conical inlet for receiving the fiber bundle coming from the drafting mechanism, and the conduit 5 is divided into two branches 6 and 7. Four nozzles 8 extend tangentially along the conduit 5. These nozzles 8 communicate with an annular delivery channel 9, which communicates with an opening 10 for connecting the nozzle to an external pressure source (not shown). As shown in FIG. 1, these nozzles have conduits 5
Is inclined with respect to the axis of. The inclination of the nozzle and the radial opening of the nozzle with respect to the conduit 5 allow a helical flow in the conduit 5 to form the conduits 6 and 7.
Is formed to face.

A slide 11 is formed in the recess 12 of the delivery device. This slide 11 has two passages 13 and 14
These passages 13 and 14 are arranged to communicate the conduit 5 with the conduits 6 and 7, respectively, at the two limit positions occupied by the slide 11 in the recess 12. Two openings 15 and 16 are formed at the two ends of the recess 12, respectively, so that the recess 12 can be selectively supplied to a source of pressurized air (not shown) via a control valve 19 by separate supply lines 17, 18. The slide valve 11 is adapted to be movable between two extreme positions connecting the conduit 5 to the conduit 6 or the conduit 7. Slide 1 passage 1
The distance between the inlets of 3 and 14 is small but smaller than the diameter of the conduit 5, so that by moving the slide 11 between its extreme positions, the pressurized air does not flow back into the conduit 5. It can always flow into the conduits 6 and 7. Such backflow could otherwise interrupt the spinning process.

By moving the slide 11 from one extreme position to the other extreme position, the edges of the inlet openings of the passages 13 and 14 are moved with respect to the outlet opening of the conduit 5 and the fiber bundle is cut. On the other hand, on the side of the slide located between the outlets of the passages 13 and 14, the gap 1 and
By forming 1a, it is possible to avoid that the stump of the fiber bundle is sandwiched.

As shown in FIG. 1, each of the branch pipes 6 and 7 passes through a respective drawing device 22 and 23, and a centrifugal rotary pot 20,
21. These rotary pots are rotationally driven by a suitable means (not shown). The respective tubular parts 24, 25 leading to the drawing devices 22, 23 are surrounded by respective telescopic tubes 26, 27. These telescopic tubes 26, 27 are fixed to a support 28, and are vertically moved alternately as indicated by arrow F by a drive mechanism (not shown) of the spinning machine. Telescopic tubes 26, 2
The lower end of 7 is moved along the longitudinal axis of the centrifuge pot and the fibers exiting the base of the telescopic tube are the centrifuge pot 2.
It is distributed along the sidewalls of 0 and 21.

Each expansion tube 26, 27 has its own sleeve 2.
The sleeve is surrounded by 9 and 30, and the purpose of installing this sleeve is to form an expanded contour shape portion 31 as illustrated in FIG. 4 at the lower end thereof, which guides the fiber bundle to the inner wall of the rotary pot 20. It serves to do before the fiber bundle exits the end of the sleeve 29. The expanded contour shape portion 31 is connected to the inner wall surface of the sleeve 29 by a convex contour 32. This end structure of the sleeve 29 is proposed from the viewpoint of preventing the fiber bundle appearing therein from being entangled around the sleeve. This is a particular problem when the fiber bundle forms an acute angle with the inner wall of the sleeve 29 and the telescopic tube 26 is lowered.

The removal conduits 33, 34 are connected to the drawing devices 22, 23.
Extending from and ending in a winding bobbin for the yarn 41 formed in the rotary pot. Each delivery conduit 1
Nozzles 35 and 36, which are selectively connected to a source of pressure air not shown by 8, 17 are open to the respective conduits 6 and 7 and have a tilt angle to direct an air jet to the respective withdrawal conduits 33.34. Is playing. Two shut-off devices 37 and 38 are provided at the branching points of the withdrawal conduits 33 and 34, parallel to the respective conduits 6 and 7, at the withdrawal device 22,
It is attached to 23. These shut-off devices 37 and 38 are respectively associated with pneumatic actuator devices 39, 40.
Mounted as a double-acting piston-cylinder, which is counter-connected to the delivery conduits 17, 18, such that when one of the shut-off valves closes its withdrawal conduit the other shut-off valve The take-off conduit is open, and conversely, when one of the shut-off valves opens the take-out conduit, the other shut-off valve closes the take-out conduit. This is clear from FIG.

FIG. 5 shows a modified structure capable of continuously producing yarn by the centrifugal spinning machine of the present invention.
In FIG. 5, the delivery device 4 is arranged at the exit of the draft mechanism, and the sliver R is drafted and delivered from the rollers 1 and 2 of the draft mechanism. Branch pipes 6 and 7 coming out from the delivery device 4, drawing devices 22 and 23, and a centrifugal rotary pot 2
0, 21 and conduits 33 and 34 are provided.
These conduits enter a known first fiber accumulator 43, where the yarns introduced therein are withdrawn at different speeds. And
The fiber joining device 42 is the EP-A owned by the applicant.
1-0 249 578 and the like. A second known yarn storage and delivery device 43a is provided next to the joining device. These known yarn storage and delivery devices are of the type described in U.S. Pat. No. 3,796,384. This yarn storage and delivery device is capable of receiving yarns at different speeds and, at the same time, delivering the yarns at different speeds by its storage function. The bobbin 44 associated with the spool shaft 45 driven by the drive mechanism of the spinning machine can receive the yarns continuously ejected from the yarn storage-delivery device 43a. The winding speed corresponds to the forward speed of the yarn.

The operation of the apparatus for carrying out the spinning method of the present invention will be described with reference to FIGS. 1 to 4. The fiber bundles from the draft mechanisms 1 and 2 enter the conduit of the delivery device 4 and are subjected to the helical force caused by the air flow from the nozzle 8. Air under pressure which carries the yarn when it encounters the branch pipes 6 and 7 is led to the open branch pipe, i.e. the branch pipe connected to the conduit 5 by the passages 13 or 14. In the figure, the branch pipe 6 is open. Therefore, the yarn that has been pretwisted in the conduit 5 enters the conduit 6, traverses the drawing device 22 and reaches the centrifugal rotary pot 20 at the outlet of the end of the telescopic tube 26. The telescopic tube 26 has alternating vertical movements that allow the threads to be distributed along the inside surface of the rotating pot.

When a certain amount of yarn accumulates with the addition of a certain twist caused by the rotation of the centrifuge pot 20, the valve 1
9 switches the source of pressurized air from delivery conduit 17 to delivery conduit 18. The slide 11 moves from left to right in the recess 12 and allows the conduit 5 to communicate with the branch pipe 7 at the same time when the thread is cut. The air is no longer guided to the conduit 6, but instead is guided to the rotary pot 21 via the branch pipe 7, the injection device 23, the conduit 25 and the telescopic tube 27.

At the same time, pressurized air is guided through the nozzle 35 into the take-off channel 33, the free end of the yarn is introduced into the take-out channel 33 and the yarn is withdrawn from the rotary pot 20. If the rotary pot continues during the yarn withdrawal operation, additional twist will be induced in the yarn, and twist will occur as it enters and exits the centrifugal rotary pot. During this period, the spinning of the fiber bundle continuously coming from the draft mechanism is continued to the centrifugal rotary pot 21. At the moment the fiber bundle is cut by the movement of the slide 11, the new end of the fiber bundle from the drafting mechanism does not undergo twisting from the centrifuge pot. However, a pre-twist is given to the fiber bundle coming out of the draft mechanism based on the spiral flow given to the pressurized air from the nozzle 8, and this pre-twist causes the fiber bundle to be combined and the fiber bundle is centrifugally rotated. It is introduced into the pot 21.

FIG. 5 shows that an originally discontinuous spinning process is converted into a continuous process from a card sliver like open-end spinning, and the yarn quality is inferior to that of the ring-traveler system. 7 illustrates an example in which what may be provided. The yarn is guided from the rotary pots 20, 21 to the first yarn storage device 43. A length of yarn is stored in the second storage device 43a. The end portion of the yarn of a certain length wound around the yarn accommodating device 43 is directly guided to the joining device 42. The joining device already holds the rear end of the yarn stored in the yarn storage device 43a. These two ends are EP
-A1-0 249 578, the yarns being spliced in the first yarn accommodating device 43 and at the same time being withdrawn into the second yarn accommodating device 43a, so that the bobbin 4
4 will be continuously supplied. As soon as the joining is done, the thread is no longer held by the joining device and the second
Is wound around the yarn accommodating device 43a of the
Is held at the end of a length of yarn drawn from the other rotary pot, and this process is repeated. The rotation speed of the bobbin 44 exactly matches the yarn production speed. The storage speed of the second yarn storage device must be higher than the production speed in consideration of the yarn joining time. The first yarn accommodating device accommodates the yarn during the splicing operation, but it is emptied once the splicing is completed, and at the same time is accommodated in the second yarn accommodating device 43a at the same speed as the yarn. .. Therefore, the storage speed must be greater than the yarn production speed, because the centrifugal spinning pot must be loaded and unloaded while it is being filled.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a spinning machine.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a partially enlarged view of FIG.

FIG. 4 is a partial detailed view of FIG.

FIG. 5 is a perspective view when the spinning machine of FIG. 1 is applied to a continuous yarn forming and winding device.

[Explanation of symbols]

 1, 2 ... Delivery roller 4 ... Delivery device 6, 7 ... Branch pipe 8 ... Nozzle 11 ... Slide 12 ... Recess 19 ... Control valve 20, 21 ... Centrifuge rotary pot 22, 23 ... Withdrawal device 26, 27 ... Telescopic tube 28 ... Supports 33, 34 ... Extraction conduits 37, 38 ... Breaker 39, 40 ... Pneumatic actuator 42 ... Thread joining device 43 ... First storage device 43a ... Second storage device 44 ... Bobbin

Claims (8)

[Claims] 1. A fiber bundle produced by a draft mechanism is accumulated on a side wall of a rotary pot, and the fiber bundle is cut immediately upstream of the rotary pot as soon as a certain length of yarn is accumulated on a wall surface. One of the cutting ends, which forms the end of the accumulated yarn of a certain length, is guided to the winding bobbin, the other cutting end is guided to the side wall of the second rotary pot, and the fiber bundle is In the centrifugal spinning method in which the length of yarn accumulates on the side wall of the second rotary pot, it is immediately cut again, and in the centrifugal spinning method in which the above steps are continuously repeated, between the outlet of the draft mechanism and the cut end of the fiber bundle, A helical force rotating about the longitudinal axis of the fiber bundle is imparted to the fiber bundle to guide the other end alternately to each wall surface of the rotary pot and at the same time to pre-twist the fiber bundle in the axial direction. A tensile force component that is applied and thereby applied to the fiber bundle A method for centrifugal spinning, characterized in that 2. A rotary pot (2) for alternately receiving fiber bundles.
0, 21) and two branch pipes (6, 7) for guiding the fiber bundle to the rotary pot and two conduits (33, 34) respectively connected to the branch pipes (33, 34). 5) and
Means (28) for inducing relative movement between the outlet end of the branch tube and the rotary pot (20, 21) in the axial direction of said rotary pot, and under pressure directed to conduit (5) to draw in the fiber bundle. Means for connection to a fluid source (8);
Cutting means (11, 13, 14) for the fiber bundles arranged at the entrance of each branch pipe (6, 7) and means (11) for passing the fiber bundle from one branch pipe to the other branch pipe. , 13, 1
In a spinning machine equipped with 4) and withdrawing means (35, 36) for the ends of the cut threads, the fluid under pressure is introduced into the conduit (5).
The above-mentioned means (8) for guiding to (1) is a fine spinning machine characterized in that it is a nozzle configured to impart a spiral flow to simultaneously induce pretwisting and tension in the fiber bundle. 3. Cutting means (11, 13, 14) are arranged to alternately open and close each branch pipe (6, 7) at its connection point, passing one branch pipe through another branch pipe. The spinning machine according to claim 2, which functions as a means. 4. The withdrawal means (35, 36) has withdrawal conduits (33, 3) with outlets terminating in a yarn storage device (43).
4), wherein the yarn accommodating device (43) allows the yarn to be conveyed and taken out at different speeds, and the outlet of the device is connected to the yarn joining device, and A second yarn accommodating device (43a) is located downstream, and the yarn can be supplied and taken out at different speeds in the device (43a), and the outlet of the second yarn accommodating device (43a) is wound. Spinning machine according to claim 2, characterized in that it is connected to a take-up bobbin (44). 5. Movable closing means (37, 38) are provided at the respective intersections between the branch pipes (6, 7) and the withdrawal conduits (33, 34), these closing means being provided for the energy source. They are connected to double-acting actuators which are connected in opposition to one another, so that when one of the closing means has its withdrawal conduit in the closed position, the other closing means is in the open position and vice versa. The spinning machine according to claim 2, wherein when the drawing conduit is in the open position, the other closing means is in the closed position. 6. The means (11, 13, 14) for passing the fiber bundle from one branch pipe to the other branch pipe comprises a slide (11) slidably mounted in the recess (12), Both ends of the recess (12) are selectively connected to a fluid source under pressure so that the slide valve can move between two extreme positions, the slide valve comprising the two extreme positions of the slide (11). At the two passages (13, 1) that allow the conduit (5) to alternately communicate with the two branch pipes (6, 7) in
The spinning machine according to claim 2, further comprising 4). 7. The distance between the inlet openings of the passages (13, 14) is smaller than the diameter of the conduit (5).
The spinning machine described in 1. 8. The two branch tubes are telescopic members (2) fixed to a drive means (28) for imparting alternating axial movement.
6), these outlets forming a flared portion (31) surrounded by an annular wall (32), for which the annular wall (32) is relative to the axis of the telescopic member (26). The spinning machine according to claim 5, wherein the inclination is reversed with respect to the expanding portion.