Abstract: The process is carried out on a spinning system that has a driven spindle (13) and a balloon limiter (14) concentric with it, driven in the same direction as the spindle (13) an provided with an inner work surface (44). For the purpose of reaching the high operating speed, the yarn (P) entrained by the work surface (44) and running toward the tube (23) on the spindle (13) is first always given by the centrifugal process the shape of a rotating, open loop (48), from which the yarn (P) is subsequently drawn off and coiled directly onto the tube (23). In this connection, this rotating, open loop (48) can be radially delimited by a rotating or stationary limit ring (28).

Abstract: A belt tightening device is provided for open-end spinning machines which is capable of ensuring good belt thrust, eliminating vibrations, and reducing the noise level of the machine. Each bearing box of a belt tightening roll is attached to the end of a pair of flat legs extending in spaced apart relationship to each other along the endless driving belt. The legs are connected to the bearing box either by spring elements, or are formed themselves by leaf springs.

Abstract: A travelling service unit prevents full bobbins removed from bobbin holders from assuming an unwanted position when being laid onto a conveyor belt. According to the invention, the travelling service unit is provided with bobbin gripping means attached to conveying means. The latter is arranged on the frame of the travelling unit for swinging about a longitudinal pivot extending in parallel to the conveyor belt, together with the gripping means and a full bobbin, transversely to the space above the conveyor belt, by driving means.

Abstract: A device for automatically spinning-in yarn in spinning units of open-end rotor spinning machines improves the process of leading the spinning-in head of the device onto the take-off tube of the spinning unit by using simple means.According to the invention the spinning-in head is attached to a swing lever by attaching means kinematically firmly in the plane of its swing motion but resiliently in the direction perpendicular to said plane, in order to allow the spinning-in head to move across the mouth of said take-off tube while being lead by a lead-on cone.

Abstract: An easy and simple transport of cop tubes to a travelling automatic service unit for exchanging wound packages for empty tubes has a conveyor in the form of a flat belt supported by upper slide surfaces of supporting walls fixed onto beams of the machine frame. The walls, together with the belt are inclined to the horizontal plane at an angle of at least 10 degrees, and at most 45 degrees.

Abstract: The invention solves the problem of ejecting impurities out of a cleaning aperture in the fiber separating device of an open-end rotor spinning unit, particularly when there are various contaminations of fibrous slivers and of different kinds of textile fibers being processed. For this purpose an air flow regulator is provided in the separating device in an air supply duct communicating with the cleaning aperture. According to the invention, the air flow regulator is provided with an air directing wall near the outlet of the air supply duct and thus directs air flow into the cleaning aperture toward the fiber opening cylinder.

Abstract: The invention relates to an open-end rotor spinning unit and particularly solves the problem of the relationship between a fiber defining stud of a separator, a fiber supply duct and a yarn take-off duct passing through the separator and the stud.According to the invention, there is established a dimensional relationship of the defining stud to the mean staple length of fibers, and the orientation of the supply duct at an acute angle to the front wall of a cylindrical projection partially engaging into the spinning rotor.In inner section of the peripheral wall of the defining stud is curved in the direction of a natural fiber flow trajectory into the direction of the spinning rotor rotation while the outer section is either in contact with or radially set back from the cylindrical wall of the projection at a distance of up to 4 millimeters from the edge of the wall.

Abstract: This invention relates to an apparatus for emergency fiber supply to a spinning unit in an open-end spinning machine. According to the invention, a sensing unit controls an electromagnetic coupling and fiber supply device, such that a break in the yarn is rapidly detected and the fiber supply is immediately disengaged, even if the conventional thread breakage detector fails.A sensing unit is disposed in that portion of the wall of a cover that extends into the spinning rotor interior. It is adapted to respond to the excess accumulation of unspun fibers and/or an undue increase in temperature by disconnecting the electromagnetic fiber supply coupling via the thread breakage detector circuit to which it is connected. The sensing unit can be a pressure sensitive microswitch, a bimetallic relay, a thermistor, or a combination of these elements.

Abstract: Method of and apparatus for spinning yarns from staple fibers in an air vortex in a stationary spinning tube axially coupled by one of its ends to a stationary air chamber, and by its other end to a sub-atmospheric pressure source. A flow of discrete fibers is supplied into the air chamber onto the wall of an air vortex which entrains, doubles and densifies the fibers before they are taken onto an open end of yarn which is given an additional twist while being withdrawn in the region between the air chamber and a take-off device. A fiber supply duct which opens into the air chamber is oriented toward the wall of the air vortex, an additional twisting device being provided between said twisting device and said air chamber.

Abstract: Method of and apparatus for a continuous monitoring and analysis of spinning units operation in multiple unit open-end spinning machine. The invention permits the obtaining of reliable data about the operation of open-end spinning units in the machine, and of immediately processing them in the form of an analysis of the total performance of one or a plurality of machines. The active or inactive state of operation of the individual spinning unit is detected by a continuous monitoring of the spinning units at predetermined intervals consisting in emitting checking signals by a timing pulse generator of the monitor to those units. The signals thus obtained are used for analyzing the active state of the spinning units, the inactive state of the spinning units, the analysis of the active or inactive state of spinning units on each side of the machine, and an analysis of the production rate of the machine.

Abstract: Fiber separating device of an open-end spinning unit wherein the wall facing the fiber separating cylinder is provided with an impurity separating duct and with one or more air supply apertures. The air supply apertures are oriented symmetrically with respect to a plane substantially passing through the axis of the impurity separating duct and perpendicular to the axis of the fiber separating cylinder, the axes of said apertures including the same angles with the opposite walls of the impurity separating duct. The fiber separating device of the invention solves the problem of withdrawing impurities from fibrous materials supplied to the fiber separating device of open-end spinning unit, while reducing losses of the fibrous material.

Abstract: Apparatus for separating fibers in open-end spinning units having a fiber separating cylinder in a cavity of a housing in which on a cylindrical surface there is provided a cleaning aperture with an impurity separating duct which latter opens by its impurity rebounding wall into a cylindrical impurity collecting chamber communicating, on the one hand, with an air supply aperture and, on the other hand, with an impurity sucking-off duct. In accordance with the invention at least one of the walls of the impurity sucking-off duct tangentially merges into the cylindrical wall of the cylindrical impurity collecting chamber, and the height of said sucking-off duct in the region of joining said collecting chamber is the same as or larger than the height of the outlet from said impurity separating duct into said collecting chamber.

Abstract: An open-end spinning machine having an open-end spinning unit with novel apparatus for withdrawing impurities released in the spinning unit. An impurity releasing duct outlet of the sliver separation housing of the open-end spinning unit extends from said housing and has substantially the same cross-sectional inner height dimensions as those of the cleaning aperture, while a connecting tube inlet joined to said outlet is substantially conically flared, a gap being provided between said outlet and said inlet for the sucking-in of additional air.

Abstract: The invention relates to a method of and a system for controlling the operation of open-end spinning machines comprising a plurality of spinning units, which method is based upon a permanent cyclic communication of a central unit of the system with the individual spinning units. According to the invention, at a given instant, a single spinning unit only is connected to the central unit of the control system, said central unit being supplied with information data about the condition of the spinning unit connected thereto while said central unit simultaneously transmits instructions for said spinning unit, the other spinning units operating automatically on the basis of the stored instruction the validity of which lasts for the time of one control cycle.

Abstract: Improved yarn spinning-in process and apparatus in open-end rotor spinning units which raises the quality of the spun-in point in the yarn to a level comparable with the quality of the entire yarn length. The yarn open end is pieced on to high-quality fibers while low-grade fibers are separated from the high-quality fibers and do not participate in the spinning-in process.

Abstract: The invention relates to an apparatus for the spinning-in of yarns in an open-end rotor spinning unit. The apparatus includes a spinning-in device for returning yarn end through a take-off duct into the spinning rotor, a severing device for shortening the yarn end to a predetermined length, and a withdrawing duct which communicates with the take-off duct and which is designed, on the one hand, for holding the yarn end by the action of a vacuum which, in the contact region of the two ducts, exceeds the working vacuum in the take-off duct, and, on the other hand, for withdrawing the severed yarn end. In accordance with an essential feature of the invention, at least one air nozzle opens into the withdrawing duct which during both spinning and spinning-in processes is connected to a subatmospheric pressure source, which nozzle is designed for introducing a fresh yarn end into the take-off duct by a controlled air outflow in a particular phase of the spinning-in process.

Abstract: Method of and apparatus for operating an open end spinning machine having a plurality of spinning units each including a sliver feeding device, a fiber separating device, a twist forming element, a yarn taking-off device, yarn winding device and a reversing mechanism for returning the yarn end back into the twist forming element. The twist forming element and the fiber separating device are set in operation; thereafter the fiber feeding is started simultaneously with the yarn end reverse travel to return same into the twist forming element in which a fibrous ribbon is formed of the fibers supplied. After spinning-in said yarn end with said fibrous ribbon the yarn is again set into a forward operative travel.

Abstract: An open-end spinning method and an apparatus wherein a flow of discrete fibers is supplied to a fiber spreading element by which they are spread over the entire periphery of an inner fiber deposit surface of a drum where a fibrous layer is continuously created. Fibers are successively withdrawn from the fibrous layer by taking off the open end of yarn and rotating it about its axis, due to a twisting moment acting on the yarn, such twisting moment being created in a region beyond the drum axis. The yarn can be given an additional twist by causing its open end to revolve about the axis of the drum. The invention enables the attainment of a high degree of the so-called cyclic fiber doubling in the spinning process, a high productivity at a relative low peripheral velocity of the operating elements of the spinning device, and the possibility of manufacturing yarns of various parameters and characteristics in one and the same spinning unit.

Abstract: Method of and apparatus for exchanging full bobbins for empty ones in textile machines, particularly open-end spinning machines with take-up and winding rollers for taking-off and winding yarn on a bobbin. An end of yarn severed between said take-up rollers and said winding rollers is introduced into the tube of an empty bobbin in three phases. In the first phase, a preparation step for gripping the yarn between the take-up rollers and the winding rollers takes place; in the second phase the delivery yarn is gripped and severed; and in the third phase the gripped yarn end is introduced into the interior of the bobbin tube at least over its entire length, and is simultaneously prevented from being untwisted at the tube edge.

Abstract: Multi-component yarn comprising as one component an open end yarn core formed in an open end spinning chamber from staple fibers, and at least a further component consisting of a longitudinal formation which is wrapped on this yarn core in said spinning chamber, advantageously along a helix in the direction of the twist of the yarn core while maintaining the original character of the formation wrapped on the yarn core. The invention also includes the method of and the apparatus for forming such multi-component yarn.