CZ302815B6 - Method of spinning fibers in spinning rotor by associated twist member and apparatus for making the same - Google Patents

Abstract

When spinning separated fibers /35/ associated within a spinning rotor /22/, a fiber band /2/ is formed on a collecting periphery /1/. A twist member, added to the spinning rotor /22/, such as a pneumatic spinning nozzle /7/ carries out twisting of said fiber band /2/. The fiber band /2/ is supplied to a magnetically conducting body, such as a roller /11/, wherein said pressure roller /11/ is pressed to the collecting periphery /1/ by a magnet /15/ that is located outside the spinning rotor /22/. The fiber band /2/ is sucked in the pneumatic spinning nozzle /7/. The position of the roller /11/ is adjustable relative to the spinning nozzle /7/ according to the sort of the fibers being spun and to a required structure of the fibers in a yarn /20/, by sliding a segment /18/ with the magnet /15/ attached thereto, round the collecting periphery /1/.

Description

Technical field

The invention provides a method of spinning staple fibers loose from a fiber strand, for example a sliver, and subsequently bundled into a fiber ribbon by cycling to increase uniformity on the collector circuit of the spinning rotor. The fiber ribbon is twisted by a spinning nozzle. The spinning rotor only rotates at a peripheral speed such as the yarn withdrawal speed.

BACKGROUND OF THE INVENTION

Known methods of spinning staple fibers, such as annular fibers, are widespread throughout the world, with hundreds of millions of spindles and millions of spinning rotors running in production countries. The spindles have a production speed of about 10 to 15 thousand turns per minute, new machines have 20 to 25 thousand turns per minute. On these machines the product is a spiral, which is necessary for further technological processing of the yarn to rewind to a greater winding.

Spinning rotors typically have 50 to 80 thousand turns per minute and new machines have 100 to 150 thousand turns per minute. These machines are equipped with various degrees of automation means up to the complex automation of yarn production in the spinning mill, where the individual technological stages are interconnected by robot technology.

In the last decade, jet spinning technology has been successfully developed in which a pneumatic nozzle twists the fibers through an air vortex. The yarn winding speed is 400 to 500 meters per minute and the machines are equipped with automation for breaking the break and for changing spools of 3 kg or more. The air swirl can twist the yarn in three ways. Either by winding the fiber ends around the continuous fiber ribbon by a true twist or by winding, or by winding the fibers with the principle of twisting so-called false twists. In this method of spinning, the rotating vortex imparts a high twist to the continuous strand of filaments and additional filaments or filament portions, most commonly the rear ends, are fed to the rotating portion of the ribbon. After passing the ribbon through the nozzle, the false twist is nullified (twisted), and the filaments that are fed in are formed during the backward rotation around the ribbon of the winding and cause yarn strength. Both of these methods are applied industrially. Right-hand twist pneumatic spinning is a developmentally younger principle that has been applied industrially over the past eight years.

In the case of jet spinning, a continuous ribbon of fibers produced by a prestretch device made of a linear fiber pattern - a strand or a strand - is twisted. The high production speed heats and extremely stresses the components and accessories of the prestretch device, especially the stretch tapes and rollers, which have a very low lifetime, causing manufacturing difficulties and losses. Attempts to create a fiber ribbon with a combing roller have not yet been brought to industrial use.

The third pneumatic principle consists in supplying a uniform flow of loose fibers to the rotating vortex in the spinning nozzle where it is sucked in and where a more complex fiber structure is created which is the source of yarn strength. The implementation of this principle has less dynamics than the first two principles.

SUMMARY OF THE INVENTION

The invention solves the downforce of the fiber ribbon in the spinning rotor on the collecting circuit as it is twisted by an associated cutting member, preferably by a spinning nozzle.

- 1 GB 302815 B6

It is an object of the invention that the associated torsion member exerts a torque on the fiber ribbon beyond the sensing point from the collecting circuit of the spinning rotor. This torque and twist penetrates back into the fiber ribbon to the collector circuit and must be stopped to prevent yarn breakage. The distance of the twist stopping point from the torsion member depends on the operating factors, in particular the length of the spun fibers and the manner of twisting the fiber ribbon.

The solution of the twist stopping task is carried out by a control thrust which acts on the fiber ribbon in the set position on the collecting circuit. The thrust is performed by a magnetic force acting on the magnetically conductive thrust piece. Its downforce is provided by a magnet or a permanent magnet, which is located near the outer wall of the spinning rotor in a stable adjustable position. A rotary member, for example a ring, ball or preferably a pressure roller of magnetically conductive material, is used as the thrust member. The position of the magnet can be easily adjusted to the optimum distance between the pressure roller and the spinning nozzle.

The principle of twisting the fiber ribbon on the collector circuit by the associated torsion organ divides the formation of the ribbon and its twisting into two separate technological operations, similarly as the spinning rotor divided the functions of twisting and winding the yarn.

Therefore, in the solution according to the invention, the twist function is not limited in terms of performance by technological dependence, for example fiber length or rotor diameter, but only by physical laws and technological expediency. The peripheral speed of the rotor is identical to that of the yarn draw-off. This opens up new possibilities for further development of the spinning technology.

Overview of the drawings

1, there is a schematic representation of a collector 1 with fibers 35 associated in a ribbon 2 towards which the spinning nozzle 7 is directed to twist the fibers 35. The twist from the spinning nozzle 7 penetrates the torsion section 10 and stopped by a roller 11 pressed by . The fibers 35 are fed in the direction 3 by the arms 4, which rotate in the direction 5 and the filaments 35 are fed into them by an axial inlet 6.

In FIG. 2, an axial section of the device for disengaging the fibers 35 through the combing roller 37 and guiding the fibers 35 through the axial lead 6 and the arms 4 to the coaxial spinning rotor 22 is shown. located outside the spinning rotor 22.

DETAILED DESCRIPTION OF THE INVENTION

The supply strand 40 of the fibers 35 with a disintegrating device comprising a feed roller 41, a densifier 39 and a combing roller 37 transforms into a stream of disintegrated fibers 35, which is fed by an axial inlet 6 and arms 4 to a collector 1 into a fiber ribbon 2 to a pressure roller 11 pressed against the collecting circuit 1 by a magnet 15. The twist of the ribbon 2 penetrates from the spinning nozzle 7 through the torsion section 10 to the pressure roller 10. As the arms 4 are rotated, further fibers 35 are fed to the torsion section 10. In the torsion section 10, false spinning occurs. It is nullified behind the spinning nozzle 7 when the yarn draw-off 20 is withdrawn, and when the yarn is reversed at the exit of the spinning nozzle 7, it is wound in the opposite direction of the fiber which has been subsequently fed to the torsion section. the suction effect required to start the spinning process. The spinning nozzle 7 can also be adapted to suck up the fibers 35 released sequentially from the clamp by the pressure roller 11 to twist in the spinning nozzle 7, where the fibers 35 are connected to the forming yarn section 20 by a right twist. 1 for uniformly releasing fibers 35 for spinning. Compressed air is supplied to the spinning nozzle 7 by the inlet 8 in the direction 9. The position of the pressure roller 11 on the collecting circuit 1 influences the way the rotating air stream acts on the fibers. 35 ^{in the} spinning nozzle 7. By changing the position of the pressure roller ϋ the conditions of the treated fibers 35 are influenced, in particular when they change their length or or if they intend to influence the fiber structure and the yarn strength.

To control the pressure of the roller 11, the magnet 15 is displaced in the direction 13. The distance of the pressure roller 11 from the spinning nozzle 7 in the direction L9 is adjusted by moving the segment 18 around the collecting circuit 1.

The pressure of the roller 11 is adjustable in both the direction 12 and the direction 13. In the axis 14 a permanent magnet 15 and an insert are fixed as a magnetic flux damper 16 and adjoined by a magnetic conductor 17 which concentrates the magnetic flux by constriction. The inlet 6 is mounted on ball bearings 28 and is provided with a pulley 29 driven by a belt 30.

The preparation of the fibers 35 from the fringe 38 for spinning is accomplished by disengagement from the strand 40 pressed in the direction 42, which is fed by the densifier 39 and the feed roller 41 to the combing roller 37. 4, the filament stream 35 is rotated onto the collector 1 of the spinning rotor 22, the shaft 26 of which is mounted on a roller bearing 23 and driven by a tangential belt 25 and a pulley 24. The spinning rotor space 22 is closed by a front cover 32 in which the process air outlet openings 31 in the direction 33 and a through hole for receiving the spinning nozzle 7 in the direction of the collecting circuit 1. The front cover 32 is slidably mounted on the axial inlet 6 for cleaning the collecting circuit 1 when the spinning process is interrupted.

Claims (7)

PATENT CLAIMS A method of spinning fibers (35) associated in a ribbon (2) on a collector circuit (1) of a spinning rotor (22) and twisted by an associated spinning nozzle (7) to which the ribbon (2) is fed by a collector circuit (1). in that the ribbon (2) of the fibers (35) in front of the spinning nozzle (7) is pressed by a magnetic force against the collecting circuit (1) of the spinning rotor (22) with a pressure roller preferably in the adjustable position relative to the spinning nozzle (7) according to the selected fiber spinning conditions (35), a magnet (15) acting on the roller (11) by a magnetic force on the outside of the spinning rotor (22), Method according to claim 1, characterized in that the ribbon (2) of the fibers (35) is twisted by a spinning nozzle (7) over the whole cross section by a false twist which penetrates from the spinning nozzle (7) to the collecting circuit (1) up to at the thrust point of the ribbon (2) by a roller (11), the loose fibers (35) fed to the spinning rotor (22) being connected to the rotating twisted section (10) of the ribbon (2). Method according to claim 1, characterized in that the ribbon (2) of the fibers (35) is released from the pressure point by a roller (11) by rotation of the collector circuit (1) and is fed to the spinning nozzle (7). whose flow releases the fibers (35) from the untwisted state of the ribbons (2) and the top filaments wrap the yarn core with a right twist. Method according to claims 1 to 3, characterized in that the position of the roller (11) is moved from the start position to the operating position when starting the spinning process according to the set program. -3 CZ 302815 B6 5. The apparatus for carrying out the method comprises a spinning rotor (22) and a loose fiber supply (35) at a collector circuit (1) to which a spinning nozzle (7) is attached, characterized in that a device is provided for the collector circuit (1). to disassemble the fibers (35) from the sliver (40) and the inlet (6) to couple the fibers (35) by the rotating arms (4) on the collecting circuit (1) on which 5, there is a presser, preferably a pulley (11) of magnetically conductive material in front of the spinning nozzle (7), and a magnet (15) which is adjustably displaceable with segment (18) around the collector circuit (1). Device according to claim 5, characterized in that a magnetic conductor (17) and / or a magnetically damping conductor is connected between the magnet (15) and the spinning rotor (22) for transferring the magnetic flux 10 from the magnet (15) to the roller (11). element / 16 /. Device according to claims 5 and 6, characterized in that the magnet (15) is designed as a permanent magnet.