Abstract: The invention concerns both a method for controlling a traversing device driven by a stepping motor and a traversing device, in which the position of a traversing thread guide which is moved to and fro within a traversing stroke is determined by the position of a rotor of the stepping motor, the rotor moving within a stator of the stepping motor with several windings. The movement of the rotor is controlled, according to the invention, by a stator flux which is determined by a stator voltage generated by means of a flux control device.

Abstract: A godet for heating an advancing synthetic filament yarn is provided, the godet comprising a plurality of stationary primary windings and, with respect thereto, a magnetically conductive, rotatably supported godet jacket. The godet jacket is coupled with the primary windings via a defined radial clearance extending between same and the side walls of the primary winding carrier for generating induced currents. The carriers are constructed such that their transformer sheets radially overlie each other in the region of their channel bottom, thereby shielding the magnetic flux outward, in particular toward the coil support.

Abstract: A lubrication system for supplying lubricant to a plurality of antifriction bearings, and which has a lubricant supply tank and a closed circuit lubricant supply line having two ends which communicate with the tank. A pump circulates the lubricant through the line, and a pressure regulating valve in the downstream end portion of the line maintains a desired pressure in the line. A plurality of tap lines lead from the closed circuit supply line to respective bearings via a metering or controllable valve.

Abstract: A filtering method and apparatus for continuously filtering a polymeric melt, which includes a plurality of filter chambers which are arranged in a melt flow path parallel to one another. Also, an intermediate filter is arranged parallel to the filter chambers. When one of the filter chambers is disconnected for the purpose of cleaning or replacing the filter element therein, the intermediate filter is connected synchronously in the melt flow path and, after the filter chamber is cleaned, or the filter element is exchanged, the flow is switched back through the filter chamber, and the intermediate filter is again disconnected.

Abstract: A godet for guiding and advancing a yarn with a rotating godet jacket. The godet jacket is mounted to a rotor shaft, which is driven by means of a three-phase motor. The three-phase motor is controlled via a frequency inverter, which is mounted in a housing, whose interior accommodates the electronic subassemblies of the frequency inverter in a stationary and heat transferring manner. The housing of the frequency inverter is firmly connected to the housing of the three-phase motor.

Abstract: A yarn winding bobbin having a tubular wall and which includes a yarn catching slot so that the bobbin is able to catch a continuously advancing yarn during a bobbin changing operation on a continuous winding machine. The yarn catching slot is configured to catch the yarn as the yarn and surface of the bobbin move in the same direction, and it includes a tongue for initially engaging the yarn and a clamping slot into which the yarn is guided by the tongue.

Abstract: A yarn winding apparatus for winding a plurality of continuously advancing yarns into cross wound packages, and which includes a rotatable revolver which mounts a pair of winding spindles which are alternately moved between a winding position and a doffing position. A beam-like carrier supports a yarn traversing mechanism and a sensor roll for each package being formed, and the drive electronics and the control electronics are combined in a control unit which is mounted on the outer end portion of the length of the carrier.

Abstract: An apparatus and method for melt spinning a plurality of downwardly advancing multifilament polymeric yarns, and winding the advancing yarns into respective packages. Each of the advancing yarns is brought into contact with a separate yarn delivery mechanism which acts to control the yarn tension before the yarn is wound into a package. Thus, the yarn tension of all of the yarns can be made substantially the same when they are wound into packages, which permits all of the packages to have the same winding structure and the same packing density.

Abstract: A process and apparatus for cooling freshly spun polymeric filaments as part of the formation of a multi-filament yarn, wherein the filaments are passed serially through a first cooling zone, a heating zone, and a second cooling zone. The resulting filaments have an improved elongation at break and an improved stretchability.

Abstract: A filtering method and apparatus for continuously filtering a polymeric melt, which includes a plurality of filter chambers which are arranged in a melt flow path parallel to one another. Also, an intermediate filter is arranged parallel to the filter chambers. When one of the filter chambers is disconnected for the purpose of cleaning or replacing the filter element therein, the intermediate filter is connected synchronously in the melt flow path and, after the filter chamber is cleaned, or the filter element is exchanged, the flow is switched back through the filter chamber, and the intermediate filter is again disconnected.

Abstract: The invention relates to a spin beam for spinning a plurality of synthetic filament yarns, and which has the shape of an elongate, hollow parallelepiped block formed by two side walls, a lower wall, an upper wall and end walls. The spin beam comprises a number of pressure-tight spin heads with downwardly extending spinnerets arranged in at least one row on a lower support. An upper support mounts at least one multiple pump which is connected, via distribution lines, to the spin heads. A pump connection plate is joined to the upper support for each multiple pump. Each of the distribution lines is connected on the one hand to the pump connection plate and on the other hand to one of the spin heads, the distributing lines forming together with the pump connection plate, the spin heads, and the lower support, form a self-supporting distributor unit. The lower support forms a portion of the lower wall of the spin beam, and the side walls are mounted on the lower support of the self-supporting unit.

Abstract: A yarn false twist texturing machine having a vertically adjustable device for threading and guiding the advancing yarn at a location between the heater and the cooling plate of the machine. The threading and guiding device comprises a tubular casing having a rodless magnetic piston mounted for sliding movement therein, and a magnetic sliding element and a yarn guide mounted for sliding movement on the outside of the tubular casing. The polarity of the magnetic sliding element is opposite that of the rodless magnetic piston so that the magnetic sliding element follows the movement of the magnetic piston, and the magnetic piston is moved by compressed air delivered into either one or both ends of the tubular casing.

Abstract: The invention relates to a spin beam (1) for spinning a plurality of synthetic filament yarns and a spinning machine comprising a spin beam (1) of this type. The spin beam (1) consists of an elongate rectangular solid, which is filled with a heating medium, and the underside of which mounts two parallel rows of connections (20), each connection accommodating a spin pot (17) with a spinneret (18). From a melt supply line (23), melt is distributed to a multiple spin pump (12) for each row of connections (20), and supplied therefrom via melt distribution lines (14) to the spin pots (17) of each row. The filaments emerging from spinnerets (18) are cooled and solidified below the spinnerets (18) by directing thereto a transverse flow of cooling air. The cooling air exits from a permeable wall (33) of an air distribution chamber, the permeable wall facing one row of spinnerets, and the chambers defining a common rectangular solid.

Abstract: An apparatus and method for melt spinning polymeric yarns, wherein a main melt flow is generated by an extruder and supplied to a spin head. The spin head is enclosed in a heated spinning beam and comprises a mixer, a distributor pump and a plurality of spinnerets. A feed device generates a secondary flow which is supplied to the main melt flow for the purpose of additive admixture. The secondary flow and the main melt flow are combined inside the spinning beam.

Abstract: A yarn false twist texturing machine in which an advancing yarn is deflected by a feed yarn guide at a deflection position which is between a heater and a cooling member, and which is at an elevation outside the reach of the machine operator. The feed yarn guide is height adjustable, and it is disposed on a sliding element, which is movable upwards and downwards on a guide rail by means of a linear drive. In the event the electrical energy supply of the machine fails, the linear drive is activated by means of a control device in such a way that the sliding element and the yarn guide move downwardly to a predetermined parking position just below the yarn deflection position, so as to automatically remove the yarn from the heater and thereby prevent yarn damage.

Abstract: An apparatus and method for the production of a multicomponent yarn which is composed of several multifilament strands with differing characteristics, such as color. The individual strands are drawn in parallel and simultaneously by a pair of godets following spinning, and then crimped by compression in an air jet crimping device. According to the invention, the individual strands are spread apart from one another prior to run-off from the drawing godet in such a way that the distance in the axial direction between the run-off points of the individual strands on the godet surface is increased. This spreading of the strands assures that the strands do not intermix prior to entering the air jet crimping device.

Abstract: An extruder for melting plastic granules which is designed as a two-stage system in an integrated structural unit with an extruder chamber having an extruder screw in a heatable housing, as well as with a drying chamber having a heated conveying screw with displacement elements which dry the plastic granules and axially convey them to the extruder chamber without compression. In a preferred embodiment, the conveying screw has a larger diameter than the extruder screw, and displacement elements of greater depth than the extruder screw.

Abstract: Method of diagnosing failures in a production process of a synthetic filament yarn, in which a first process parameter dependent on the process control is continuously measured and evaluated, and in which as a function of the evaluation or course derived therefrom an indication signal is generated, there being continuously measured and evaluated at least a second reference parameter dependent on the process control, and the indication signal being generated, when an error-typical behavior is found in the first and in at least one additional parameter.

Abstract: A heating apparatus for an advancing thermoplastic yarn, which is guided along a heated surface over heating ridges. Essential is that the heat flow to the yarn is variable, in particular by a change in height, a change in width of the heating ridges, and/or a change in the contact length with the yarn. In this connection, the heating ridges may be adjustable, and/or the path of the yarn may be made variable by yarn guides.

Abstract: A yarn takeup apparatus for winding a continuously advancing yarn into yarn packages and which has a rotatable winding turret which supports for rotation two winding spindles. By the rotation of the winding turret, the winding spindles are moved alternately to a winding range and a doffing range. To this end, the winding spindles are mounted on the winding turret such that the spindles are movable relative to the winding turret respectively between a radially outer position and a radially inner position by a moveable spindle mount. At the beginning of the winding operation, the winding spindles are in the outer position, and during the build of the package, an evasive movement of the winding spindle is performed by movement of its mount and/or rotation of the winding turret.