Abstract: A twist tube for a false twist device is described which is of the type wherein textile yarn being textured passes through a straight tubular part to a transverse pin of hard material round which the yarn is wound once prior to leaving the tube. To avoid ballooning at very high rotational speeds of the twist tube about its axis, the pin is fixed in the tubular part with its axis displaced laterally with respect to the tube axis by a distance which is a fraction of the pin diameter. Between its cylindrical ends the pin is formed with a cylindrical concave surface providing a gap with respect to the tube axis of a width of the order of half the yarn thickness. To aid threading, openings are provided on opposite sides of the tubular part and the one nearest the laterally displaced pin is enlarged to balance the twist tube about its axis.

Abstract: Friction discs for use in driving of guide rollers for twist tubes in false twist devices for texturing synthetic filaments are described in which the disc comprises a support disc of non-resilient material surrounded by a friction ring of synthetic resilient material that is tapered radially outward to the circumferential surface making contact with the twist tube. This enables the friction discs to be spaced more closely together in the roller and shorter twist tubes to be used. Centrifugal force on the friction ring is also reduced. Higher rotation speed are, therefore, achieved. The ratio of the width of the inner circumferential surface of the friction ring to the width of its surface engaging the twist tube is between 1.5:1 and 3:1. The support disc may be of metal alloy or consist of an inner disc of synthetic plastics material with an outer ring of metal alloy. In each case the metal alloy should have a modulus of elasticity of at least 6500 kp/mm.sup.2 and a tensile strength of at least 25 kp/mm.sup.

Abstract: Apparatus for automatically forming a yarn reserve on a wind-up bobbin of a yarn treatment machine, is described in which a slot disc at one end of the bobbin pinches and tears off the yarn prior to causing the yarn to engage a first stationary catching thread guide through which the yarn passes while being wound to form the yarn reserve. However, as the usual reciprocating thread-guide approaches the end of the bobbin, a movable thread-guide element fixed thereto transfers the yarn to a second stationary catching thread-guide. Then, on reversal, the movable-thread-guide element releases the yarn, the second catching thread-guide being positioned so that the yarn then enters the reciprocating thread guide to enable the yarn to be wound up to fill the bobbin in the wind-up range thereof.

Abstract: A textile machine having a line of bobbins to which filaments are fed continuously is provided with bobbin-exchanging device arranged to run along a rail in front of the bobbins. On reaching a bobbin holder on which a full bobbin is to be exchanged for an empty one, the device is stopped and a first arm is swivelled upwards for a holding device thereon to engage the full bobbin. Simultaneously a second arm carrying a power driven friction roller for maintaining the rotation of the full bobbin is swivelled into engagement with the full bobbin, and a third arm having an outwardly extended pivoted terminal portion carrying a device holding an empty bobbin, is swivelled upwards. The first arm is then withdrawn carrying the full bobbin past the empty bobbin while the full bobbin is being driven by the friction roller. The terminal portion of the third arm is pivoted inwards and the third arm raised further to place the empty bobbin in the bobbin holder.

Abstract: The wear due to the filaments on a circulating delivery belt having a surface for receiving thereon a stream of textile filaments and conveying them, for example in a false-twist texturing machine, is reduced by feeding the filaments, just prior to reaching the belt, through a thread-guide that has a reciprocating motion transverse to the filaments imparted thereto which is the resultant of two uniform components of reciprocation of different periods, so that the position of the filaments across the belt is varied in non-uniform cycles repeated in groups thereof. The thread-guide is carried by a rod in which is mounted a journal having eccentric pins at its opposite ends. A basic component of reciprocation is imparted to the rod by a track rotating eccentrically about a fixed axis and acting on one of the two pins to cause the journal and rod to reciprocate along the rod axis.

Abstract: A twist tube for false-twist devices for texturing textile yarns is described wherein the thread guide pin has terminal portions coated with a solderable metal, such as nickel. The terminal portions are mounted in bores on each side of the elongated metal tubular part of the twist tube and at least one of the coated terminal portions is soldered into its associated bore at a temperature which does not modify the crystalline metal structure of the twist tube nor cause thermal deformation of the twist tube. The opposite terminal portion may be similarly soldered into its bore or it may be elastically mounted in its bore. Processes involving soft soldering and hard soldering are described.

Abstract: Devices for false-twist texturing textile filaments are described wherein a twist tube is rotated while magnetically held in a wedge shaped gap between a driven roller and a supporting roller which is rotated by power transmitted thereto predominantly by a rotary driving member in frictional contact with the two rollers. This driving member may be a cylindrical pin in the wedge shaped gap opposite that containing the twist tube and held in the gap by magnetic attraction or repulsion. Alternatively the driving member may be a roller mounted freely to rotate about its axis in frictional contact with roller surfaces on shafts carrying the driving and supporting rollers.

Abstract: A process is described for obtaining finishing effects on textile material consisting, at least partially, of cellulose fibers, without seriously reducing the tensile strength, tearing strength or wearing strength of the fibers. A finishing agent, capable of cross-linking with the hydroxy groups of the cellulose fibers, in a solution or emulsion containing a mixture of water and at least one organic solvent, such as low aliphatic ketones, aliphatic chlorinated hydrocarbons or low aliphatic esters, is applied to the textile material. The stability of the mixture is controlled by a salting-in or salting-out effect so as to induce a phase separation between aqueous and solvent phase, this effect being induced by the use of neutral salts, acid salts, potentially acid salts, organic acids, synthetic resins or reactants. The finishing agent is concentrated in the aqueous phase in the interior of the individual fibers while the surface zones retain the good surface properties of the starting material.

Abstract: Apparatus and processes are described in which a friction twist imparter is used to twist two filaments or filament bundles while passing through a processing zone in which the filaments are textured by imparting a temporary high twist to the filaments and heat-setting the twisted filaments. Variations in twist density due to variations in the co-efficient of friction between the ply-yarn and twist imparter are controlled by separating the ply-yarn into two separate filaments or bundles of filaments at a point beyond the friction imparter and sensing variations in the position of the separation point, the wrap angle or tension, or both, of the ply-yarn leaving the friction twist imparter being adapted to such variations. The means for this particularly described are mechanical and include a spring-loaded lever projecting between the separated filaments at the separation point so as to follow changes in the position of this point.