Abstract: The invention relates to a method of respinning-in in open-end spinning machines after a bobbin removal from the swinging arms (51, 52) of the bobbin holder (5) or at the beginning of spinning at an empty spinning station, and to a device for carrying out the method. During the fixing of the empty tube (8) between the swinging arms (51, 52) of the bobbin holder (5) at a spinning station at rest, an ancillary yarn (15) is inserted between a swinging arm (51) and the edge of the tube (8) and then gripped the swinging arm (51), then its opposite end is adapted for one spinning-in in an attending device (9) and spun-in, then is this ancillary yarn (15) together with the beginning of the newly spun yarn wound onto the tube (8) as yarn reserve, whereupon the yarn is handed over to the distributing mechanism of the machine for producing a cross-wound bobbin.

Abstract: In an open-end spinning machine, an empty tube is placed between the holder swinging arms of a bobbin holder of a spinning station at rest. An ancillary yarn is inserted and gripped at one end between one of the swinging arms and the edge of the tube. The opposite end of the ancillary yarn is adapted for spinning-in by cutting and shaping the opposite end which is in turn fed into a spinning unit. The ancillary yarn together with newly spun yarn is wound onto the tube through the spinning unit for making a yarn reserve. This yarn reserve is used by the open-end spinning machine for producing a cross-wound bobbin.

Abstract: A device for handling wound bobbins which are wound on a spinning machine includes an attending device which is moveable along the spinning machine from one wound bobbin to another. A tending device includes a lever which carries a gripping mechanism, for swinging the gripping mechanism toward and away from a wound bobbin. The gripping mechanism has gripping arms which can be spread for receiving a wound bobbin and then brought together for grasping a wound bobbin. The gripping mechanism can then rotate the arms through 180.degree. and the lever can move the mechanism over a conveyor to deposit the wound bobbin onto the conveyor in the same orientation, whether the bobbin was removed from the spinning machine from one side or from an opposite side.

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 device is provided which solves the problem of feeding cop tubes in a textile machine from a supply container to a withdrawing station by means of a conveyor disposed in a conveying channel extending along the machine above the spinning units. The conveying channel has a side wall and a lower horizontal support wall on the upper slide surface of which there is disposed an endless belt of the conveyor. Above the belt there is provided, on the one hand, at the beginning of the conveying channel, an outlet for the supply container for cop tubes to be deposited onto the endless belt, and, on the other hand, in a cop withdrawing station, a retaining unit for arresting the movement of the tube being supplied. The retaining unit comprises a catch which has a blocking arm with an abutting front end provided at the tube supply side and oriented across the endless belt of the conveyor, and a lifting arm with a contacting surface for engaging a tube traveling along the belt.

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: A fiber opening device of the spinning unit of an openend rotor spinning machine, for avoiding misalignments in the connection between the front end of the sucking tube of a travelling automatic service unit and the inlet port of the spinning unit, in order to prevent false air from being sucked in at this contact point. According to the invention, a sucking tube is provided with a self-adjustable sealing head having a front sealing surface to be fitted onto the front wall of the spinning unit. In the inner space of the sealing head a partially spherical concave surface fitted onto a mating, partially spherical convex surface provided at the end of the said sucking tube.

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: A process of automatic yarn spinning-in in the spinning unit of an open-end rotor spinning machine of an automatic service device provided with a control unit having a programmable microprocessor control system for controlling the spinning-in cycle and the automatic adjustment of spinning-in parameters modified according to successive verifying tests which are performed by the automatic service device which is either arranged in the individual spinning units, or as a unit traveling along the machine. By successive tests, spinning-in parameters are adjusted for an interval for yarn return to the spinning rotor as well as for determining the start of fiber feeding. The spinning-in parameters can be corrected by further verifying tests in spinning units with various dynamic characteristics.

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 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: A method of and an apparatus for piecing yarn in open end rotor spinning units. The returning of the yarn end into the spinning rotor for piecing is performed in two stages, in the first of which the yarn is stopped immediately upon breakage within the sucking range of the spinning rotor, and is brought immediately thereafter into a withdrawal chamber in which the yarn end is retained. In the second stage the yarn end is separated and deposited in said withdrawal chamber, and the new yarn end is introduced by further reverse motion into the spinning rotor. The apparatus has a withdrawal chamber interposed between the inlet of the withdrawing channel and a cutting mechanism. In one embodiment said chamber is connected to the withdrawing channel, opposite which there is mounted a nozzle connected to a controlled pressure air source. In another embodiment there is provided a nozzle communicating with the withdrawal chamber, said nozzle being connected to a controlled source of underpressure.

Abstract: An improved technique for stopping the advance of spun yarn through the draw-off rollers and distributing cylinder of an open-end spinning machine in response to a detected yarn breakage condition is described. A reversible clutch is selectively interposed between first and second oppositely rotating drive shafts and the cylinder, which in turn is coupled to the draw-off rollers. The clutch is operated from a normal forward advance condition to an operated reverse condition for a duration corresponding to a variable-duration control pulse generated in response to a yarn breakage condition upstream of the discharge end of the machine withdrawal tube. The duration of the control pulse is adjusted to dynamically brake the forward motion of the advancing yarn to a stop. The control pulse is removed soon enough to prevent reverse movement of the yarn.

Abstract: An arrangement for timing the initiation of a spinning-in operation of an open-end textile machine is described. A sequencer is coupled to the take-up bobbin to provide an indication proportional to the increase in diameter of the yarn package during the take-up operation. The sequencer converts changes in such indication to a variable delay of signals to be applied to at least the take-up rollers and yarn-distributing rollers of the machine. The thus-delayed signals, whose delay is continually updated as the diameter of the yarn package increases, are applied to the appropriate rollers upon the detection of yarn breakage or other suitable initiation signal for the spinning-in mode.

Abstract: A method and an apparatus for conveying empty bobbin tubes through a channel member which extends longitudinally along a plurality of working units of an open-end spinning, winding, yarn texturing or similar machine. The apparatus of the invention includes a transporting member which is operatively mounted on the machine so as to move in a stepwise manner along the plurality of working units of the machine. The machine includes a bobbin supply and withdrawing station opposite each working unit. The transporting member is adapted to move in a stepwise manner from one bobbin withdrawing and supply station to the next adjacent one. The apparatus further includes a channel member extending longitudinally along the plurality of working units. A plurality of empty bobbin tubes are disposed in the channel member end-to-end so as to form a column. The transporting member has a carrier member extending therefrom towards the channel member.

Abstract: Cop tube holder for winding yarns or threads on textile machines, and more particularly on open-end spinning machines with an automatic cop exchange, provided with a pair of bent levers adapted to swing in the holder and carrying rotatable dishes for placing the front portions of the tube while the operating pressure necessary for clamping a tube between the dishes is exerted by a spring. The bent levers are motion-coupled to each other by means of a kinematic pair.

Abstract: An open-end spinning machine, is operated by continuously advancing a yarn towards a take-up station at which it is wound onto a bobbin rotating at a predetermined speed, so that a yarn package forms on the bobbin and the latter eventually becomes full. As the bobbin approaches a condition of fullness, an empty bobbin is rotated adjacent to it and is accelerated until it reaches the speed at which the full bobbin rotates. The yarn which advances onto the full bobbin is then severed from the yarn package on the latter, to provide a free yarn end which is inserted into one axial end of the rotating empty bobbin, to be engaged and entrained by the latter whereby winding of the free yarn end onto the empty bobbin commences. The full bobbin is now removed from the station and is replaced with the rotating empty bobbin.