Classifications

• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01H—SPINNING OR TWISTING
  • D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
  • D01H1/11—Spinning by false-twisting
  • D01H1/115—Spinning by false-twisting using pneumatic means

Definitions

• the present invention relates to an air spinning machine for producing a yarn from a fiber structure, wherein the spinning machine comprises at least one spinning station, the spinning station a vortex chamber with an inlet opening for the fiber structure and at least partially extending into the vortex chamber yarn formation element in the form of an inlet mouth having a spindle in which the swirl chamber is associated with spinnerets oriented towards an outer surface of the spindle, via which air can be conducted into the swirl chamber, in order to impart rotation to the fiber structure after a piecing operation in the area of the inlet mouth of the spindle, and wherein the spindle engages with the Has inlet port adjacent exhaust duct, over which the yarn from the vortex chamber is removable. Further described is a method of piecing a fiber strand to an air-spinning machine used to make a yarn.
• Generic air-jet spinning machines serve to produce a yarn from an elongated fiber structure by means of a vortex air flow generated by the spinnerets within the vortex chamber.
• the outer fibers of the fiber composite are wound around the inner fibers (core) in the region of the inlet mouth of the spindle, so that, as a result, a stable yarn is produced which can finally be removed from the vortex chamber via the withdrawal channel and wound onto a reel.
• the yarn end and with it the end of the fiber strand is moved into the interior of the vortex chamber by switching on the spinnerets and / or starting the Garnaufspulung and exposed there to the fluidized air flow.
• the connecting area between the yarn end and the end of the fiber material finally passes the inlet mouth of the spindle. The spinning process will continue as usual.
• the airflow ratios generated by the spinnerets are usually optimized with respect to the actual spinning process, they are usually less optimally designed for the piecing process, so that said bonding area remains visible in the finished yarn and / or represents a region of reduced strength.
• the object of the present invention is therefore to propose an air-jet spinning machine and a method which ensures particularly reliable piecing. allow a fiber composite, without at the same time the actual spinning process is deteriorated.
• the air-spinning machine is characterized in that the swirl chamber are assigned additional piecing nozzles, which are likewise aligned in the direction of the surface of the spindle, wherein the spinning station has an air supply system by means of which the spinnerets and the piecing nozzles can be supplied separately with air.
• the spinning station thus has two types of air nozzles, so that an individual adjustment of the flow conditions during spinning or during spinning is possible.
• the orientation and / or dimensioning of the spinnerets can in this case be chosen so that as far as possible all outer fiber ends of the fiber composite are wound around the core during spinning.
• an air flow may be advantageous, which allows a partial dissolution of the outer fibers from the fiber structure in order to wrap them immediately thereafter around the remaining core of the fiber structure. This is particularly advantageous because during piecing the connection region between the yarn end and the superimposed end of the fiber composite is passed through the swirl chamber and thus becomes part of the later yarn.
• the connection area again consists in part of already twisted yarn (in the form of its end overlaid with the fiber structure).
• both the spinnerets and the piecing nozzles can be designed specifically for their particular task, without having to take into account a mutual interplay of the individual airflows.
• the switching on and off of the air supply of the respective nozzles can be done for example by means of appropriate valves. Alternatively, however, it is also conceivable to supply both the spinnerets and the piecing nozzles with air during piecing.
• the ratio of the air pressures prevailing in the individual nozzle types or the air volume flows passing through the respective nozzle types can in turn be adjusted and / or monitored individually by the control and / or regulating unit individually for the spinning and the piecing process. For example, it would be advantageous if during the piecing process, between 60% and 95% of the total air supplied to the nozzles is introduced via the piecing nozzles and the remaining amount of air via the spinnerets into the vortex chamber. The same applies analogously to the spinning process, so that it would be advantageous here if between 60% and 95% of the total amount of air supplied to the nozzles via the spinnerets and the remaining amount of air through the piecing nozzles would be introduced.
• this may mean that the ratio between the air pressures prevailing in the spinnerets and the piecing nozzles during the spinning process can be between 1, 1 and 10. Accordingly, the ratio during the piecing operation is preferably between 0.1 and 0.9.
• first air duct and the second air duct can be actuated via a valve which can be actuated by means of a control and / or regulating unit. til communicate with a common air line.
• the valve in this case serves as a kind of flow switch, whereby depending on the position of the switch either the piecing nozzles or alternatively the spinnerets are acted upon with air.
• the respective supply of air can also be done manually or automatically, for example based on measured quality characteristics of the produced yarn.
• the air supply system has a first air duct, which is connected to the spinnerets and with the aid of which the spinnerets are supplied with air, and that the air supply system has a second air duct, which is connected to the piecing nozzles and with the aid of the piecing nozzles be supplied with air.
• the first and the second air duct may, for example, extend annularly in a wall surrounding the vortex chamber.
• said channels can be connected via a single or two separate air lines with a corresponding source of compressed air.
• the air channels can be placed at the level of the inlet mouth of the flue or between the inlet mouth and the inlet opening of the swirl chamber. The same applies to the spinnerets and / or piecing or their opening into the vortex chamber openings.
• the piecing nozzles are aligned such that air streams generated by the piecing nozzles enter the vortex chamber tangentially in a plan view of the inlet mouth.
• the air streams also impinge with a tangential component of motion on the fiber structure entering into the inlet mouth of the spindle, thereby causing the desired rotation.
• the air flows generated by the piecing nozzles should also exert a suction effect on the yarn end, the connection point between the yarn end and fiber structure and finally the subsequent fiber structure, the air flow should also have a directional component which extends in the spinning direction. As a result, the piecing nozzles should therefore generate an air flow.
• the piecing nozzles are arranged between the inlet opening of the vortex chamber and the inlet mouth of the spindle or open into the vortex chamber in this area. This allows alignment of the piecing nozzles according to the invention without significant modifications of the remaining spinning station being required.
• the spinnerets are also preferably arranged in said region, and these are usually likewise oriented such that the generated air flow strikes mainly the outer surface of the spindle in order to produce the desired rotation of the yarn in this region.
• the piecing nozzles can also be arranged between the spinnerets and the inlet mouth of the spindle (again viewed in the axial direction of the withdrawal channel).
• the spinnerets are located between the inlet opening of the vortex chamber and the piecing nozzles.
• the piecing nozzles are arranged at least partially in a wall section surrounding the vortex chamber.
• the piecing nozzles can be precisely placed and precisely aligned with the outer surface of the spindle (preferably on its frontal area having the inlet mouth).
• the piecing nozzles can be drilled in the wall or also connected to it, in particular releasably in the form of inserts.
• the number of piecing nozzles (preferably a number between two and six) is freely selectable, and it has proven to be advantageous to distribute the piecing nozzles uniformly around the inlet mouth in the circumferential direction.
• the angle is less than 90 ° and smaller than the angle ß.
• the imaginary extension of the respective piecing nozzle hits in this case at a steeper angle to the outer surface than the corresponding extension of the spinnerets. In this way, on the one hand, the suction effect during piecing can be intensified. At the same time, however, the partial removal of individual fibers described above and subsequent rewinding of the inner fibers is favored.
• a central axis of at least one of the spinnerets has a minimum distance A to a center axis of the spindle in a plan view of the inlet opening of the spindle and a center axis of at least one piecing nozzles in plan view of the inlet opening a minimum distance B to the central axis of the spindle where A is not equal to B.
• the respective nozzles are preferably arranged so that their center axes are skewed to each other and each to the central axis of the spindle.
• the minimum distance B is smaller than the minimum distance A.
• the connection area thus, unlike the majority of the known air spinning machines, no longer any weak point of the yarn. This is especially true for the piecing of particularly rigid fibers, in which a relatively high counterforce must be overcome during the Umwindevorgangs.
• the inventive method for piecing a fiber dressing is finally characterized by the fact that an air spinning machine with spinnerets and separate piecing nozzles and possibly one or more of the features already described is used.
• the fiber structure (together with the hereby preferably brought outside the vortex chamber in contact yarn end) by means of a piecing generated by the air flow, in particular in a linear motion, through the vortex chamber and finally into the flue, wherein the fiber strand with Help the air flow in addition to the said movement is given a rotation about its longitudinal axis.
• the piecing nozzles can be switched off again (ie their air supply is stopped).
• the inventive method is thus characterized characterized in that from the spinnerets independently operable Anspinndüsen are used, which - comparable to the spinnerets - produce a directed onto the outer surface of the spindle air flow.
• the air flow finally differs from the air flow generated by the spinnerets in their orientation and / or their intensity and can be adjusted independently of the air flow during the spinning process to the material to be spun.
• the piecing nozzles are subjected to air during the piecing process, and that after completion of the piecing process, only the spinnerets are exposed to air.
• the respective nozzles can be optimally designed in this way for their respective task (piecing a fiber composite to produce a yarn). A mutual influence of the respective air flows, however, does not take place.
• FIG. 1 shows a schematic and partially sectioned section of an air-spinning machine
• FIG. 2 shows a sectional side view of a selected region of the spinning station of an air-jet spinning machine according to the invention
• Figure 3 is a sectional side view of a selected portion of the spinning position of another air-spinning machine according to the invention.
• Figure 4 is a sectional plan view of a selected portion of the spinning station of an air-spinning machine according to the invention.
• FIG. 1 shows a schematic and partially sectioned section of an air-jet spinning machine.
• the air-spinning machine comprises a drafting system 20, which is supplied with a fiber structure 2, for example in the form of a doubled sliver 2.
• the air-spinning machine comprises a spinning station 3 which is at a distance from the drafting system 20 and has an inlet 19 for the fiber structure 2 and an internal vortex. chamber 4.
• the fiber composite 2 is introduced into the spinning station 3 by means of a delivery device 21 designed as a delivery roller pair, which in turn can be part of the drafting system 20.
• a delivery device 21 designed as a delivery roller pair, which in turn can be part of the drafting system 20.
• the fiber structure 2 or at least part of the fibers of the fiber structure 2 is provided with a rotation after passing through the inlet opening 5 for producing the desired yarn 1.
• the spinning machine shown comprises a pull-out device 25 formed by a pair of draw-off rollers 24 and a winding device 28 connected downstream of the take-off roller pair 24 for winding up the yarn 1 drawn from the spinning station 3 via the inlet mouth 6 of the spindle 7, the subsequent take-off channel 10 and finally via the outlet 23 a coil 27.
• the spinning machine may be equipped with a yarn monitoring unit 26 which monitors previously defined parameters of the yarn 1 (eg, yarn thickness, yarn tenacity or other parameters representative of the quality of the yarn 1).
• the yarn monitoring unit 26 preferably operates without contact.
• the device according to the invention need not necessarily have a drafting device 20, as shown in FIG. Also, the take-off roller pair 24 is not absolutely necessary.
• the regular spinning process is stopped. If this process is to be resumed, a piecing Operation necessary, in which the end of the already produced yarn 1 with the fiber structure 2 must be brought into contact or connected.
• the yarn 1 is usually moved by means of a service robot, a spinning station's own yarn handling device or manually against the actual spinning direction through the discharge channel 10 until the vortex chamber 4 passing end of the yarn 1 between the input 19 of the spinning station 3 and the Delivery device 21 or between the delivery device 21 and an adjacent pair of rollers 22 of the drafting system 20 is placed.
• the vortex chamber 4 are assigned additional piecing nozzles 11, which, like the spinnerets 9, are aligned in the direction of the outer surface 8 of the spindle 7.
• the spinning station 3 also has a Air supply system 12, by means of which the spinnerets 9 and the spinning nozzles 1 1 individually, ie preferably independently or alternately, are supplied with air.
• the illustrations shown in FIGS. 2 and 3 represent sectional illustrations.
• the cut does not run as a vertical plane but in such a way through the individual components, that the spinneret 9 and the piecing 1 1 are recognizable (even if these, as shown in Figure 4, only offset by about 90 ° to each other).
• a possible spatial arrangement of the spinnerets 9 and piecing nozzles 1 1 results finally from the synopsis of Figure 2 (or 3) and Figure 4 (the cut also does not exactly along a horizontally extending cutting surface).
• the spinning station 3 now has several (usually between two and six) spinnerets 9, which are preferably evenly distributed in the circumferential direction in a surrounding the vortex chamber 4 wall portion 15 are arranged.
• the spinnerets 9 are in turn connected to a first air duct 13 which extends, for example, annularly around or in said wall section 15 and together with a corresponding supply line 29 is part of the air supply system 12 of the spinning station 3.
• the piecing nozzles 1 1 (of which preferably also between two and six are present) in the preferred embodiment in which the vortex chamber 4 surrounding wall portion 15 is arranged and distributed, for example uniformly in the circumferential direction.
• the piecing nozzles 1 1 are also connected to a second air channel 14 (which may also be annular), so that the piecing nozzles 1 1 are supplied with air separately from the spinnerets 9.
• the two supply lines 29 are connected via a valve 17 to a common air line 18.
• the valve 17 in this case, either the spinneret 9 (during the regular spinning process) or the piecing 1 1 (during the piecing process described) with air is applied (whereby the air pressure generated by the respective nozzles 1 1, 13 the corresponding air volume flow during the piecing process can be selected to be higher than during the spinning process).
• an intermediate position in which a large part of the air flows through the spinnerets 9 and the remaining portion via the piecing nozzles 1 1 in the swirl chamber 4 (or vice versa).
• a central axis 16 of at least one of the piecing nozzles 11 with a central axis 16 the spindle 7 in a direction perpendicular to the common solder (other name: minimum transversal) of the said central axes 16 extending side view of an angle and a central axis 16 at least one of the spinnerets 9 with the central axis 16 of the spindle 7 in a direction perpendicular to the common solder of the two latter central axes 16 a Includes angle ⁇ , where ⁇ is smaller.
• a central axis 16 of at least one of the spinnerets 9 in a plan view of the inlet mouth 6 of the spindle 7, a minimum distance A to a central axis 16 of the spindle 7 and a central axis 16 at least one piecing nozzles 1 1 in plan view on the inlet mouth 6 has a minimum distance B to the central axis 16 of the spindle 7, wherein A is preferably greater than B. It should be noted, however, that it is not excluded that B is greater than A, if there is a positive influence on the spinning - And piecing the corresponding material to be spun.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Spinning Or Twisting Of Yarns (AREA)
• Looms (AREA)

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• 2012
  • 2012-02-09 DE DE201210101039 patent/DE102012101039A1/de not_active Ceased
• 2013
  • 2013-02-01 CN CN201380008342.1A patent/CN104169477B/zh active Active
  • 2013-02-01 WO PCT/EP2013/051987 patent/WO2013117493A1/fr not_active Ceased

Patent Citations (4)

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