Abstract: The process of an apparatus for asymmetrically heat treating chemical yarns by applying different temperatures on either side of a plane passing through two generatrices of a peripheral surface of each orifice through which the yarns are extruded during production. One side of the plane is preferably at a temperature slightly higher than the melting point of the material and the other side of the plane is preferably at a temperature slightly lower than the decomposition point of the material.

Abstract: In a process and apparatus for manufacturing drawn and twisted multifilament synthetic yarn an extruded and partially drawn filamentary synthetic yarn is subjected to a supplementary, simultaneous, drawing and twisting operation using a double twist spindle rotated such that the tension in the yarn causes drawing. After the spinning and drawing, the yarn is subjected to heat treatment under controlled tension and is then wound up.

Abstract: A yarn throwing and twisting machine has at each of a number of working positions two or more throwing spindles, a twisting spindle, a manually disengageable yarn feeder, and yarn break detectors. Pneumatic jacks are provided to disengage the spindles and feeder upon yarn breakage and are controlled by air supplied through a solenoid valve responsive to the yarn break detectors and by a manually operable valve between the throwing and twisting spindles. The solenoid valve is closed, however, upon manually disengagement of the yarn feeder for the purpose of allowing starting up at an individual working position after yarn breakage.

Abstract: A friction disc for use in false twisting has a convex, yarn contacting, peripheral surface and a recess on one or both faces adjacent the periphery, there being a sharp edge between the peripheral surface and recess.

Abstract: The invention concerns a device for up-twisting directly a spinning package having the shape of the cake. According to the invention, the device comprises a vertical spindle driven in rotation at constant or variable speed. Centering and positioning means are provided for the cake on the spindle, said means preferably comprising two cones placed in opposition and fitted at each extremity of the cake. The cones are characterized by the lower cone being secured to the spindle axle and the package being positioned between the two cones by means of a locking element which connects the lower cone to the upper cone. Preferably, the upper cone is associated with a cap flyer which projects beyond the outer edge of the package. The invention applies itself particularly well to up-twisting.

Abstract: Mechanism for selecting and controlling needles of circular knitting machine wherein, at each feed of the knitting machine, there is provided a cam path in which is engageable an outwardly projecting butt on an axially reciprocable needle to reciprocate the needle. An activating swing jack is pivoted to the bottom of the needles and a selector jack is pivoted to the unit and is operatively associated with the activating swing jack. A selector butt and a complementary eraser butt on the selector jack are respectively positively engaged by a selector lever and an eraser lever, the selector lever moving the jacks and hence the needles whereby the needle butts engage in the cam path while the eraser lever move the jacks and hence the needles, whereby the needle butts are disengaged from the cam path, respectively to bring the needle into its operative and inoperative condition. The selector and eraser levers cooperate with the selector and eraser butts of the selector jack over the entire length of the feed.

Abstract: A method and apparatus for the thermal treatment of textile articles in which a moving yarn is delivered from a yarn supply and a main thermal treatment is carried out in a conventional manner by contact with a heated oven, the yarn is cooled and a false twist is applied which feeds back to the main thermal treatment zone. The yarn is then subjected to a further heat treatment and the untwisted yarn is rewound. The yarn is subjected to a complementary heat treatment before and/or after the main thermal treatment by wetting the yarn and then heating it by high frequency heating.

Abstract: A yarn heating device comprising a lower vessel containing a heat transfer liquid and a heating device passing through said vessel over its entire length and intended to vaporize the heat transfer liquid, and an upper vessel connected to the lower vessel by a plurality of vertical conduits, through which pass treatment tubes of stainless steel or the like intended for the passage of the moving yarn, the upper part of the or each treatment tube being surrounded by a metal part which is a very good heat conductor.

Abstract: A circular knitting machine has needle beds; a cylinder and a dial, and means to drive the cylinder and dial including three assemblies symmetrically arranged about three planes which intersect on a line substantially coincident with the machine axis, the assemblies thereby acting to center the cylinder and dial. It is preferred for the assemblies to include shafts and intermediate gears connecting the shafts to crown gears on the cylinder and dial, and for the cylinder to be axially adjustable by means in each assembly relative to the dial.

Abstract: The circular knitting machine comprises at least one sinking cam and one movable cam enabling a selection of knitting elements to occupy several positions. The sinking cam is rotatably biased into a working position in which its working ramp cooperates with the butts of the knitting elements selected for knitting and can be moved to a rest position in which the working ramp cooperates with the knitting elements which are welting. The sinking cam is held in its rest position by a surface thereon which engageingly cooperates with a locking means on the movable cam when the movable cam is in a position to cause the knitting elements to welt.

Abstract: A device for reducing the otherwise minimum unthreading distance between the end of a bobbin and an unthreading guide in a textile yarn unthreading machine. The device comprises a member which defines a formed edge surface, preferably in the form of a circular disc, mounted substantially perpendicular to the axis of the bobbin and concentric with this axis. The disc is positioned between the bobbin and the unthreading guide to define a specially shaped, yarn supporting edge. The positioning of the disc is such that, as the yarn passes over the edge of the disc while being unwound, the angle formed by the straight line which joins the edge of the disc and the facing edge of the bobbin relative to said axis is equal to the half-angle of unthreading. Further the angle formed by the straight line which joins the edge of the disc to the unthreading guide, relative to the said axis, is markedly greater than the half-angle of unthreading.

Abstract: A false-twist texturing spindle in which the yarn to be twisted may be automatically threaded in the spindle through a retractable tube that is longitudinally movable between the rollers or discs of the spindle, on an axis coincident with the axis of thread travel. The retractable tube is movable from an inoperative spindle mode, allowing yarn threading, to an operative spindle mode after threading, for yarn twisting.

Abstract: A yarn texturizing machine in which there are provided a plurality of treatment positions, each position having therein a substantially T-shaped framework having a vertical portion and a horizontal portion. Each framework has associated therewith, two false twisting arrangements, each including, in operational sequence, a yarn supply device, a first yarn feeder, a yarn heating device, a cooling zone for the heated yarn, a false twist spindle, a second yarn feeder and a wind-up device. The two false-twist spindles, the two second feeders and the two wind-up devices are each mounted on the vertical portion of the T-shaped framework and the remaining components, that is to say the first feeder, the heating device and the cooling device for each spindle are mounted on one of the horizontal portions.

Abstract: A spindle adapted for mounting on the framework of a false twist texturizing machine. The spindle includes a platen having three bosses mounted perpendicularly thereon, the bosses being positioned on the platen to form a triangle. Friction discs are carried on the bosses and overlap one another to define a zig-zag path for the yarn. A two-piece fixed guide tube aligned with the center of the triangle formed by the bosses feeds the yarn into and out from the spindle. A motor pulley is mounted on a lever which pivotally attaches to the platen, the motor pulley being adapted to engage a tangential belt disposed adjacent the platen to impart rotary motion to the pulley. A belt drive interconnects the motor pulley with the bosses to rotate the same. A rod pivots the lever to engage or disengage the motor pulley with the tangential belt and control rotation of the bosses.