Abstract: There is described a two-for-one spinning or twisting spindle in which thread drawn from a take-up package is threaded through from the bottom upwards by means of a compressed-air-operated threading arrangement so that it can be connected to thread, coming from a supply package, at the top end of a thread entry tube. In the arrangement shown, a thread storage disc of a two-for-one twisting spindle has therein a thread exit passage 8 the inner end of which opens into a short tube 10 which opens in turn into a hollow shaft 12 of the spindle, leaving an annular gap 11. In operation of the threading arrangement, compressed air is fed into a hollow shank 5 of the spindle from below and flows upwards through the annular gap 11. Because of this the short tube 10 acts as an injector nozzle which sucks the thread into the thread exit passage 8 from the side and transports it upwards through the hollow shaft 12 of the spindle.

Abstract: An apparatus for braking and positioning a spinning or twisting spindle with the spindle rotor in a specified position, having a spindle brake which engages with a rotary part, preferably a wharve, of the spindle, and, separate from said brake, positioning means comprising an additional braking surface which extends over part of the periphery of a rotary part, preferably a wharve, of said spindle and up to which an additional brake member is movable. The apparatus provides a more simply constructed braking and positioning means where it is permissible for the spindle to be stopped within a certain angular range about a prescribed central position. In the illustrated embodiment, a spindle brake proper comprises shoe means 7 engageable with an inside periphery of a skirt 5 of wharve 4, and there is provided positioning means comprising an additional braking surface 9 which preferably extends over an angle from 15.degree. to 30.degree. and which is engageable by an additional brake shoe 12.

Abstract: The improved yarn brake mechanism of this invention is provided with a tubular brake housing having axially spaced apart inlet and outlet openings for passage of a yarn therethrough and an enlarged cavity formed in the tubular brake housing between the inlet and outlet openings. A pair of cooperating brake platelets is mounted in the enlarged cavity of the brake housing, the brake platelets having surface portions positioned in opposing contacting relation for applying tension to a yarn passing therebetween, and having peripheral portions which cooperate with one another to form a V-shaped groove for guiding the yarn between the opposing contacting surface portions.

Abstract: The invention relates to a centering plate for rotatably mounting a yarn carrier tube in a take-up assembly of a textile yarn processing machine. The centering plate is of an improved construction for providing reliable automatic or manual securement of a yarn end during a threadup operation, and comprising a hub extending axially into and supporting one end portion of the carrier tube and an adjoining larger diameter circumferential flange positioned in engagement with the end of the carrier tube. A circumferential yarn securement channel is provided adjacent to the flange and is defined by a pair of opposing surfaces positioned so as to provide a continuously narrowing cross-sectional area in said channel for wedging and securing a yarn therein.

Abstract: The yarn brake of this invention is useful in a textile yarn processing machine, such as a two-for-one twister, and includes a stationary permanent magnet arranged at one end of a brake housing and spaced from a fixed braking surface in the direction of movement of the yarn. A braking body is movably positioned within the housing between the braking surface and the permanent magnet, with the braking body including a permanent magnet having a magnetic polarization oriented in repelling relation to the stationary permanent magnet for thus biasing the braking body toward and into engagement with the braking surface to apply tension to a yarn passing therebetween. The magnetic repelling forces allow the braking body to be reliably moved out of engagement with the braking surface when necessary, as for example by a pneumatic flow applied to thread a yarn through the brake, or to accommodate knots or other variations in thickness in the yarn.

Abstract: A textile yarn processing machine, such as a two-for-one twister, is provided with a pneumatically operated yarn threading mechanism for initially threading a yarn through a hollow spindle of the textile processing machine during a thread-up operation and an improved self-threading yarn brake mechanism for applying tension to the yarn as it passes through the hollow spindle during operation of the machine. The improved yarn brake mechanism is constructed to cooperate with the threading mechanism to facilitate automatic threading of the yarn through the hollow spindle and is characterized in that the compressed air which is supplied to the threading mechanism during the thread-up operation also operates to move the yarn brake mechanism from an engaged position to a released position to thus automatically provide a clear path for threading the yarn through the hollow spindle.

Abstract: A yarn brake which may be utilized on a textile yarn processing machine, such as a two-for-one twister, for applying tension to a moving yarn and wherein a movable braking body is held in applied position against a braking surface and is separated therefrom during threading of the yarn through the yarn brake. An intercepting means is provided for receiving and holding the braking body, upon separation thereof from the braking surface during threading, in a position in which the braking body and braking surface remain substantially aligned for easily returning to braking engagement after the yarn threading.

Abstract: A textile yarn processing machine, such as a two-for-one twister or the like, having respective yarn processing stations is provided with an improved yarn monitoring system for stopping the operation of the yarn processing station in response to the absence of a yarn running therethrough, as for example, upon the occurrence of a yarn breakage. The improved yarn monitoring system of the present invention is constructed generally as follows: A yarn sensor is constructed and mounted so as to be held in an operative setting by yarn tension when the yarn is running in normal operating condition and to be released in the event of the release of such tension, as upon a yarn breakage. A switching mechanism is provided for stopping the operation of the yarn processing station, and means is provided for operably connecting the yarn sensor to the switching mechanism for actuating the switching mechanism upon the release of the yarn sensor from its operative setting.

Abstract: A yarn take-up and supply mechanism for selected intermittent use with textile machines, such as a two-for-one twister, utilizing yarn, such as during a threading-up operation of the machine, characterized by a construction for receiving a free end of yarn from the textile machine, taking-up a loop of a predetermined length of the yarn and completely releasing the free end and taken-up length of yarn to the textile machine in a substantially tension-free condition.

Abstract: In a process and apparatus for bulking, more particularly high-bulking, of textile yarns having fibers of different shrinkage characteristics including the step of and apparatus for temporarily heating the yarn sufficiently to obtain differential shrinkage and thus bulking of the yarn; the improvement of the steps of and apparatus for soaking the yarn with water and/or other liquid having dielectric properties similar to water while fully and evenly saturating the yarn throughout with a predetermined amount of such liquid, and applying microwave energy to the saturated yarn for heating of the yarn. With this process and apparatus, heating is uniformly applied throughout the yarn and an energy savings can be realized over conventional yarn bulking processes. This process and apparatus may be utilized in conjunction with a two-for-one yarn twisting apparatus in which the process is carried out and the apparatus is disposed between the steps of and the apparatus for twisting and taking-up of the yarn.

Abstract: Improved pneumatically operated yarn threading mechanisms are provided for textile yarn processing machines, such as a two-for-one twister or the like, having spindle assemblies each including a rotor mechanism with a yarn passageway extending along the axis of the spindle assembly and radially out, a stationary carrier mechanism carrying a hollow yarn supply package and including a hollow hub portion extending through the yarn package with a yarn passageway extending along the axis of the spindle assembly and joining with the rotor mechanism yarn passageway. The threading mechanisms automatically thread yarn withdrawn from the supply package through the passageways and includes air injector nozzle positioned at the juncture of the yarn passageways for selectively creating an air suction and positive air jet through the respective yarn passageways and an air duct for selectively supplying air under pressure to the injector nozzle from an air supply connector moved into and out of connection therewith.

Abstract: In a textile yarn processing machine, such as a two-for-one twister or the like, there is provided a plurality of yarn processing stations each including a spindle assembly carrying a supply package of yarn to be processed and a take-up assembly for forming a take-up package of yarn after processing. A yarn knotter mechanism is selectively positioned in front of the yarn processing stations in the event of yarn breakage for knotting the ends of the broken yarn extending respectively from the spindle assembly and the take-up assembly. Improved yarn transfer mechanisms are provided for withdrawing the broken end of yarn from the take-up assembly and positioning the yarn in the knotter mechanism for being knotted with the broken end of yarn from the spindle assembly.

Abstract: Yarn guiding and threading mechanisms for use with textile machines processing yarn, such as during a threading-up operation of the textile machine, are characterized by a construction adapted for receiving a free end of yarn from a first location in the machine, for guiding the yarn from such first location and for conveying the yarn to a desired second location in the machine, as follows. An elongate tube has an air passageway therethrough, a source of suction connected to one end thereof for creating a suction therethrough for receiving at the other end of the yarn from the first location in the textile machine and for guiding the yarn through the tube, and a slot extending from the outside to the passageway along the length thereof and positioned on the side adapted to face the textile machine for subsequent removal of the yarn from the tube.

Abstract: An improved spindle assembly construction for a textile yarn processing machine, such as a two-for-one twister and the like, which normally includes a rotatably driven rotor mechanism having a horizontally-extending reserve yarn storage disc and a generally vertically-extending hollow axle defining therewithin a yarn passageway extending therethrough and radially out of the storage disc, a stationary yarn supply package carrier mechanism rotatably mounted on the rotor mechanism so that the rotor mechanism rotates relative thereto, a yarn guide eyelet positioned above and in axial alignment with the hollow axle, and a driven yarn take-up winding mechanism, so that the yarn may be withdrawn from the supply package by the winding mechanism and pass through the passageway and through the eyelet to form a rotating balloon of yarn between the eyelet and the storage disc and around the carrier mechanism and the supply package as a result of the rotation of the rotor mechanism.

Abstract: A pneumatic yarn injection mechanism is provided for being operatively associated with textile machines and particularly pneumatic threading mechanisms of spindle assemblies of textile yarn processing machines, such as two-for-one twisters. The pneumatic yarn injection mechanism is characterized by a construction for creating a suction therein for grasping a free end of yarn extending outwardly from a supply package of yarn in the spindle assembly of the textile machine and for creating a positive air stream therein for conveying the free end of yarn therefrom to a desired location in the spindle assembly of the textile machine for receipt by a suction air stream created by the pneumatic threading mechanisms for effecting threading-up of the spindle assembly and to eliminate manual handling of the free end of yarn during such pneumatic threading-up of the spindle assembly.

Abstract: A yarn take-up and supply mechanism for use with textile machines processing yarn, such as during a threading-up operation of the machine, characterized by a construction for coiling a given length of yarn into a single-layer winding to produce a yarn storage and for releasing the stored yarn to the textile machine in a substantially tension-free condition, including the following. A selectively-rotatable elongate drum is operatively mounted at one end on a frame portion of the mechanism and defines an outwardly-extending overhanging free other end for winding of a given length of the yarn on the outside surface thereof. Selectively-operable clamping devices are mounted on and positioned generally at the free end of the drum for receiving a free end of the yarn and for clamping the free end of the yarn during winding of the yarn on the drum and for releasing the free end of the yarn after winding for supplying of the yarn to the textile machine from the surface of the drum by unwinding.

Abstract: A textile yarn processing machine, such as a two-for-one twister and the like, having spindle assemblies for the processing of yarn and each including a carrier mechanism for carrying a pacakge of yarn to be withdrawn and processed and defining a passageway therethrough for yarn withdrawn from the package and an enlarged cavity forming a part of the passageway, includes the combination therewith of an improved, self-threading, yarn brake mechanism positioned in the cavity, as follows. A stationary braking member forms an inclined braking surface generally around the passageway at the entrance to the cavity and a movable braking plate cooperates therewith and generally covers the passageway at the entrance to the cavity and is adjustably biased toward the inclined braking surface for applying a desired tension to the yarn passing therebetween.

Abstract: In a textile yarn processing machine, such as a twister, spinning frame or the like, having a plurality of spindle assemblies positioned in side-by-side relationship thereon for the processing of yarn, control devices operatively connected with each of the spindle assemblies for selectively stopping and starting operation of the respective spindle assemblies, and a yarn knotter mechanism for being selectively positioned in front of each spindle assembly in the event of a broken or otherwise separated yarn therein for knotting together the two ends of the separated yarn when the spindle is stopped by the control devices and including selectively actuatable mechanisms for operating the knotter mechanism for the knotting operation, the following improvement is provided.