Abstract: A method is provided for adjustment of a textile machine workstation based on yarn parameters measured by an associated yarn quality sensor at the work station. The method generates a first reference value of a selected yarn parameter by measurement of the yarn parameter or by calculation, wherein the first reference value is generated from the yarn parameter for a deliberately defective yarn intentionally produced at the workstation. The method then compares a current value or second reference value of the yarn parameter for yarn produced at the workstation of production quality or higher-than-production quality to the first reference value.

Abstract: The spinning stations of a spinning machine each have a drafting unit and a stopping device for fiber material fed to the drafting unit. A first carriage is movable along the length of the spinning machine, which carriage comprises a sensor for detecting a broken thread at a spinning station. Spatially separated from this first carriage is a second carriage, which is moveable along the length of the spinning machine, which second carriage is provided with an actuator for activating the stopping device of a spinning station in need of maintenance.

Abstract: The spinning stations of a spinning machine each have a drafting unit and a stopping device for fiber material fed to the drafting unit. A first carriage is movable along the length of the spinning machine, which carriage comprises a sensor for detecting a broken thread at a spinning station. Spatially separated from this first carriage is a second carriage, which is movable along the length of the spinning machine, which second carriage is provided with an actuator for activating the stopping device of a spinning station in need of maintenance.

Abstract: Multiple twist spindle to impart two+two twists to textile yarns and threads, whether they be continuous filaments or discontinuous fibres, the spindle comprising a spindle support (16) which supports a support (13) for the feed bobbin (12) maintained substantially stationary and two counter-rotating parts, respectively the inner rotary part (18a) and the outer rotary part (18b), the counter-rotating parts (18a, 18b) being coaxial to each other and substantially coaxial to the axis (19) of the spindle (10), the thread (F) unwinding from the feed bobbin (12) and leaving the inversion element (15) located above the bobbin (12) is induced by the counter-rotating parts (18a, 18b) to follow a path which first descends and then ascends, and then sent to collection means, the paths defining respectively an inner balloon (11a) and an outer balloon (11b) rotating outside the feed bobbin (12), the thread (F) receiving two twists for each revolution of each of the counter-rotating parts (18a, 18b), there being incl

Abstract: An optoelectronic sensor device (S) for detecting a yarn passing through a scanning zone (3) comprises at least one light source (L, L'), at least one photoelectric receiver (R1, R2) which is responsive to light variations and which is connected to an evaluation circuit (C), and a slit aperture (A1, A1) arranged between the yarn and the receiver. In a weft-yarn measuring and storing device (F), the sensor device (S) forms a withdrawal sensor for the yarn which is withdrawn overhead from the storage body (B). According to the invention at least two receivers that are closely adjacent to each other are oriented towards the scanning zone, with the receiving surfaces (4, 5) of the receivers being each covered by an upstream slit aperture (A1, A2), except for a limited area. The slit apertures (A1, A2) are arranged relative to one another at an acute angle of not more than 90.degree..

Abstract: A method and apparatus for producing randomly variegated multiple strand wrapped yarn in twisting together two or more yarns at a plurality of yarn twisting stations. At each station a pneumatic twisting head is disposed in which randomly turbulent air currents are created in a chamber in the twisting head by compressed air flowing into the chamber from a manifold through bores in the twisting head, thereby randomly twisting together two or more yarns in the chamber.

Abstract: A method and apparatus for producing randomly variegated multiple strand yarn in twisting together two or more yarns at a plurality of yarn twisting stations. At each station a pneumatic twisting head is disposed in which randomly turbulent air currents are created in a chamber in the twisting head by compressed air flowing into the chamber from a manifold through bores in the twisting head, thereby randomly twisting together two or more yarns in the chamber. The yarns which have been twisted together are taken up over a plurality of traversing drums commonly mounted on a shaft which is driven by an alternating electric current motor controlled by a control device which operates to start and restart the motor on a predetermined cycle including a variation of the electrical input sufficient to result in randomly unpredictable inertia resistance of the traversing drums to rotational speed variation, thereby creating randomly unpredictable take-up of the yarns to produce non-uniform random twist in the yarns.

Abstract: In the case of a spinning machine comprising several spinning stations, which each contain one drafting unit, and comprising depositing sites for cans containing sliver, transport devices are provided for the transporting of the delivers from the cans to the spinning stations. The transport devices comprise delivery rollers which can be stopped independently of the delivery rollers of other spinning stations and independently of the pertaining drafting unit.

Abstract: A method and apparatus for monitoring the quality of the yarn processed on a false twist texturing machine is disclosed, and which includes sensing the tension of the advancing yarn at a location immediately downstream of the false twist unit, and determining the coefficient of variation of the sensed tension. An error signal is generated whenever the coefficient of variation exceeds a predetermined upper limit and whenever the coefficient of variation drops below a predetermined lower limit. Also, an alarm signal is generated whenever the error signal exceeds the predetermined upper limit for a predetermined time, and whenever the error signal drops below the predetermined lower limit for a predetermined time, and the alarm signals are counted so as to provide an indication of the quality of the yarn.

Abstract: A process and device for the cleaning of the sensor surface of a yarn monitoring system used on spinning machines to monitor the yarn and/or the yarn quality. The yarn monitoring system is positioned without contact with the running yarn within the traversing area between draw-off roller and friction roller or below the draw-off roller. Cleaning of the sensor surfaces is carried out during the running of the yarn, at the reversal points of the yarn traversing movement, for the period of contact or nearness between the yarn and the limit of the yarn monitoring system until removal of the running yarn.

Abstract: A yarn break detecting device for a spinning machine includes detectors, a feed section and a control section. The detectors each include a pair of electrodes having substantially the same area and adapted to electrically induce a potential depending on static electricity charged on a yarn, a differential amplifier, a waveform shaper and an indicator lamp. The induced potential is then amplified and rectified to turn on the indicator lamp and concurrently fed to a microprocessor in the control section for operation processing, resulting in positions at which yarn break occurs and the number of yarn breaks being indicated.

Abstract: For the monitoring of the lap formation in the case of delivery bottom rollers of drafting units, sensing elements are provided which, when a lap is formed, as a result of the enlarged diameter at the delivery bottom roller, are moved radially away from this delivery bottom roller. The sensing elements are used as switching elements for an electric circuit to which a number of sensing elements, and preferably all sensing elements of the spinning machine, are assigned. When a lap is formed, the assigned electric contact is opened by the shifting movement of the sensing element so that the electric circuit is interrupted. The interruption of the electric circuit causes the triggering of a signal.

Abstract: In the case of a spinning machine with several spinning stations, which each comprise a drafting unit, and with depositing sites for cans containing sliver, transport devices are provided for transporting the slivers from the cans to the drafting units. The transport devices as well as the drafting units comprise devices which can interrupt the transport of an individual sliver.

Abstract: A method and installation (1) for the on-line production of a ply (21) of semblies (20) of threads (30, 40) and the winding thereof on a beam (29). A plurality of rotary devices (2) permitting the production of the assemblies (20) is used to obtain the ply (21); the ply (21) is driven along by pulling elements (23) common to all the assemblies (20); elements (32) which permit the synchronizing of the speeds of the devices (2) and of the elements (23) are used; the ply (21) is wound on the beam (29); elements (33) which permit the detection of a defect (35) in the ply (21) are used. Beams (29) obtained by this method or with this installation.

Abstract: A spinning machine including a yarn treating carrier provided with a yarn piecing mechanism and a yarn package doffing mechanism therein, moving along a rail provided on a frame of a spinning machine so as at least to stop at predetermined spindle for carrying out a yarn piecing operation and a yarn package doffing operation, and a detecting unit for detecting a position of the yarn treating carrier at each spindle portion, the yarn treating carrier controlled so as to perform at least one of a moving operation, a decelerating operation, and a stopping operation in response to a yarn treatment signal and a detection signal of a position of the yarn treating carrier, each of which being output from each of the spindles.

Abstract: Device to check the sensor (of threads on spinning machines (11), which is fitted to a stationary ring rail (15) and cooperates with a traveller (18) set in rotation on a ring (16) by the thread (17), the device (10) at least governing an arresting and cutting means (21) and comprising a microphonic sensor(27) actuated by the shock waves due to the passage of the traveller (18).

Abstract: An apparatus for sensing a parting in any of the strands of sliver fed from a creel to the drafting rolls of a high speed textile draw frame to stop the drawing process in response to a sliver parting. A plurality of sliver guides are mounted on an elongate arm which is compact and readily mounted on the creel. The sliver guides are U-shaped with inturned upper end portions defining a restricted opening at the top portion and a capacitive sensing switch positioned in the bight portion thereof. The sliver guides also include a low coefficient of friction coating to reduce the accumulation of lint. Cylindrical post separators are positioned alongside the path of the slivers to maintain separation and prevent entangling of adjacent slivers. Logic and control electronics are contained within a housing carried by the elongate arm.

Abstract: In monitoring the yarn tension at each of a plurality of yarn processing stations, the mean value of the monitored tension is continuously determined at each station, and the differential between the monitored value and the mean value is also continuously determined. In addition, an overall mean value is generated which is representative of an average of the mean value signals from all of the individual stations, and the overall mean value is compared with the individual mean value of each station. In the event the mean value signal at a particular station differs from the overall mean value signal by more than a predetermined tolerance limit, an alarm signal is generated.

Abstract: As yarn travels toward a take-up device after having passed a ballooning area, the travelling course thereof is bent through contact with a pressure sensor. An alarm device generates an alarm when the contact pressure of the yarn, which is monitored by the pressure sensor, is abnormally lowered.

Abstract: A method and apparatus measures the tension of an advancing yarn which is subject to interruptions of the yarn path, resulting for example from the severance of the yarn. During such interruptions, the zero setting of the tension sensor does not always return to zero, thereby providing an erroneous output reading during subsequent yarn advancing cycles. In accordance with the present invention, a circuit is provided which identifies such errors and sounds an alarm when the error exceeds a predetermined limit. Also, the erroneous output signal is input as the zero point signal for the subsequent yarn advancing cycle, and during such subsequent cycle, the tension is determined on the basis of the newly set zero point.

Abstract: A device for detecting a doubled yarn includes a detecting device having photoelectric sensors disposed in a plane perpendicular to a running path of a yarn provided in a housing such that beams of light projected from light projecting elements may reach light receiving elements in a perpendicularly intersecting relationship to each other. A calculating device totals up the sensed amounts individually detected by the light receiving elements of the photoelectric sensors and comparing the added up value with a reference value to detect a break of one or more of the single yarns of the doubled yarn.

Abstract: The invention relates to textile machine control. The run of spinning units is controlled by two busses, a two-way bus, and a reserve one-way bus, the latter being activated, as a rule, by a central electronic system, and possibly, though less often, by the operator. A suitable arrangement of the circuits on the criterion of whether they belong to the two-way bus or to the one-way one, facilitates troubleshooting and permits shorter repair time on vast systems comprising a plurality of work stations of the textile machine.The invention can be used on various types of spinning machines where a predetermined length of wound yarn is required.

Abstract: A monitoring needle (19) is rotatably mounted under spring tension in a housing (18). A light emitter/light receptor device is fixed to the housing (18) in the plane of the thread (5) and in the pivotal region of the monitoring needle (19), this device producing a control signal both in the case of irregularity in the thread and when crossed by the monitoring needle.

Abstract: The method and apparatus for transmitting data are used in a manufacturing machine, particularly a yarn manufacturing machine containing a plurality of production stations, a plurality of associated monitoring locations, a plurality of respective monitoring sensors, and a central control unit. The central control unit applies to the monitoring locations a modulated supply voltage via a conductor common to all of the monitoring locations. The modulated supply voltage contains a plurality of sections each of which is associated with one of the plurality of monitoring locations. The associated section is identified at the monitoring location by counting from a starting point which is marked in the modulated supply voltage. At the occurrence of a predetermined event at respective ones of the plurality of monitoring locations, respective sections of the modulated supply voltage are marked. The marked sections as well as the respective monitoring locations are identified in the central control unit.

Abstract: This invention relates to an improved apparatus and method capable of accurately measuring fixed lengths of moving strand or yarn as it is pulled from an essentially continuous source of supply and wound onto a take-up reel by an appropriately powered winding mechanism. In its preferred embodiment, the invention is used to measure lengths of fiber glass strand unwound from forming packages and onto rotating bobbins carried on a twist-frame. Moving strand is maintained in continuous contact with a metering rim supported on an essentially frictionless layer of pressurized air thereby causing the rim to rotate. In particular, the improvement comprises means for bleeding off a portion of this pressurized air by allowing it to escape through the surface of the rim whereby any broken filaments which may break away from the strand are sloughed off from the surface of the rim before they tend to become wrapped about its circumference.

Abstract: In a spinning machine having a plurality of spinning units for producing packages used as feeding packages for twisting which have two prestrengthend yarn components, a combined quality value of two yarn components is monitored and, in the case of a quality defect, the spinning operation is interrupted, the time of the interruption of the spinning operation being coordinated with the time of the stopping of the partially wound spool in such a manner that a yarn end, which is connected with the stopped partially wound spool, is located at a given position.

Abstract: According to the method, an end part of a roving is first introduced into the main drafting zone of a drafting frame of a textile machine after a reference point at a clamping device. Thereafter, a middle part of the roving is drawn laterally into the preliminary drafting zone solely by the tension of the main drafting zone. The apparatus comprises a gripper which is connected via a pivotable arm or a telescopic arm to a mobile or stationary robot which can cooperate either with a pusher, a spacer or a fixed slider.

Abstract: A device used to feed fiber slivers to a processing machine with at least one sliver guide. The sliver guide is provided with a guiding surface over which the fiber sliver is guided. The guiding surface also serves as a sliver monitoring device.The sliver guide is produced in a process in which the housing of the sliver guide, standing on its head, together with its guiding surface, is clamped over a die. A sensor is inserted into the housing from the side opposite the guiding surface and is embedded therein in a casting compound.

Abstract: Successive groups of thread paths in multi-spindle textile apparatus are equipped with individual monitoring systems. In each system, a joint monitoring element (S,E,L) is provided which has a bundle of rays (L). The latter is moved transversely to the thread running direction, passes thereby over the production points (1-8) arranged in rows and is interrupted or attenuated at each production point by the respective thread. The shading of the bundle of rays caused thereby is assessed as criterion for the presence of the thread concerned.The process makes possible an on-line production and quality monitoring on multi-spindle textile machines, for example ring spinning frames, with a reasonable expenditure.

Abstract: An apparatus for controlling a drive of each one of spinning frames forming a group, to which a conventional roving bobbin exchange operation for exchanging almost exhausted roving bobbins of the spinning frame with full packaged roving bobbins of a bobbin carrier on a supply rail arranged at a position close to and above the corresponding spinning frame by a known automatic apparatus mounted on a carrier which is capable of displacing along a track arranged on a floor of a spinning factory along an alignment of out-end frames of said spinning frames, is applied, wherein during the spinning operation, a residual roving quantity of the roving bobbins of each spinning frame is measured, while detecting a quantity of yarn wound on cops in each spinning frame, and when the above-mentioned measurement of a residual quantity of roving bobbins reaches a predetermined value, a first signal indicating this condition is issued, while the quantity of yarn wound on the cops is measured to detect a suitable condition to s

Abstract: A method for quality control of yarn for false twisters having a plurality of take-up motions, consisting of conducting quality measurement of yarn upon doffing by the take-up motions at a first point where the yarn is being twisted and at a second point where the yarn is being untwisted to provide readings of quality measurement by means of a quality measuring device.

Abstract: A common monitoring system with a light beam is provided for a group of two or more production units arranged in a row. The beam passes through the thread balloon formed by the moving thread of each of these production units and is intermittently interrupted or attenuated by the moving thread in each balloon. The resulting shading is converted into an electric signal in a receiver of the monitoring system.The threads of the individual production units can be identified by evaluating the relationships of amplitude, time and phase between the individual shading impulses.The process enables on-line production and quality control to be carried out on multi-spindle textile machines such as ring spinning machines at an acceptable cost.

Abstract: In a yarn splicing operation on a ring spinning machine wherein a broken end of yarn is drawn into a suction tube in position for splicing, the suction is reduced after the yarn is in position to avoid damage or destruction of the yarn as it is being held by suction. The reduction in suction is accomplished by the opening of a bypass, the restriction of the tube or a reduction in the speed in the motor of the suction pump.

Abstract: A device for switching off and switching on the operation of a spindle of a textile twisting or spinning machine having a rumming thread is provided which includes the following elements. A pneumatic switching device is adapted to be operatively connected to a spindle stop mechanism of the textile machine for actuation and de-actuation thereof. A movable running thread sensor device is held in a first normal operating position by the running thread in the textile machine and moves to a second switching position upon breakage of the running thread. A movable breaking sensor device is adapted to be operatively connected to a spindle breaking mechanism of the textile machine for moving between a first position during normal operation of the spindle to a second position upon actuation of the spindle breaking mechanism after thread breakage.

Abstract: A yarn storing device (1) comprises a storage drum (2) and a sensor (5) arranged at the withdrawal end (3) of the storage drum (2). The sensor (5) has the form of an eyelet (6) for guiding the yarn (4) and generates a signal during the withdrawal of yarn (4) having a frequency corresponding to the number of turns of yarn withdrawn per time unit. For enhancing the reliability of detecting the withdrawal of yarn on the basis of the sensor signal, the eyelet (6) of the sensor (5) is movably mounted on a housing (7) of the sensor (5) and comprises a light-reflecting surface (11) wherein a light-emitting element (8) and a light-receiving element (9) are fixed to the housing (7) such that the light generated by the light-emitting element (8) falls on the light reflecting surface (11) and is directed towards the light-receiving element (9) when the eyelet (6) has a predetermined relative position with respect to the housing (7).

Abstract: The process and apparatus of our invention reduces the breakdown quota of stopping devices in a spinning or twisting machine which stop the roving, e.g. when a roving break occurs. A simulated signal for "Yarn Running" is conductable to a stopping device for test purposes and/or the yarn break sensing device can be disconnected from the stopping device and from time to time a connecting signal is produced which reconnects the yarn break device to the associated stop device.

Abstract: A yarn monitoring device comprises in association with each doubling spindle (1) a sensing arm (7) monitoring the upwardly directed yarn run between yarn guide eye (3) and feed roller (V), which arm is mounted by means of a mounting bush (9) for limited swinging on a rocker shaft (6). The mounting bush (9) comprises a slot (12) extending in its circumferential direction, in which engages a stop pin (11) extending radial to the rocker shaft (6) and fixed relative thereto. In the slot (12) is a lining in the form of a substantially U-shaped clip (13) of spring steel, whose semi-circular connecting part (13b) lies at the end surface (12b) of the slot (12) directed away from the spindle and whose U-arms (13a) extend parallel to the side walls (12a) of the slot (12), abut thereagainst and are inwardly bent at their free ends (13c) so that they grip on to the stop pin (11) in the swung up position of the sensing arm (7).

Abstract: A method and apparatus for stopping and subsequently restarting an open end spinning machine wherein, upon an electrical power interruption exceeding a predetermined duration, the spinning rotor, sliver feed roller, yarn take-up roller, and yarn winding drum are deactuated, the yarn take-up roller and winding drum are braked to a standstill, and the length of withdrawn yarn during braking is measured and stored, and, upon restarting of the machine, the sliver feed roller is briefly operated to initially deliver a start-up sliver length to the rotor and yarn take-up roller and yarn winding drum are operated in reverse to feed back to the rotor a length of withdrawn yarn corresponding to the measured and stored yarn length in advance of reactuation of the spinning operation.

Abstract: The invention provides for the spinning units of a multi-position rotor spinning machine to be driven by a common AC drive motor powered by a static inverter enabling the power supply frequency to the AC motor to be controlled for controlling the rate of acceleration and the operating speed and the rate of deceleration of the AC drive motor. This facilitates a method of mass stopping.

Abstract: A clamp is disclosed to be mounted on a yarn spinning machine and, if a roving of the yarn should break, serves to clamp the roving preventing it from further unravelling. The clamp comprises a housing body including a member for defining a passage guide for the roving and a blocking element mounted by the housing body to be moved by a biasing spring from a detained position to a roving clamping position. A sensor is provided to sense the breakage of the roving for actuating an electromagnet for releasing a lever that normally engages and holds the blocking member in its retained position, whereby the blocking element is moved by the spring to it's clamping position to thereby retain and clamp the roving against the member. A guide channel is attached to the housing body and further supports a fastening mechanism for mounting the clamp to the spinning machine.

Abstract: A piecing process is provided for an open-end friction spinning apparatus of the type including movable friction surface members forming a yarn-forming zone therebetween. A friction surface driving device for moving the friction surface members during operation and for interrupting the movement of the friction surface members is also included in the apparatus. The spinning apparatus further includes a yarn end orientation member for orienting a yarn end during the piecing process. The process includes placing a yarn end into the yarn-forming zone when the rollers are stopped. The friction surface members are started such that the yarn end is prevented from being pulled too deeply into the yarn-forming zone by the yarn end orientation device. An apparatus for carrying out this process is also provided.

Abstract: Roving or sliver clamping device at the drafting unit of a spinning machine, with a clamp segment which enters in the operative position between the upper inlet roller and the lower inlet roller of the drafting unit, and which clamp segment raises the upper inlet roller from the lower inlet roller, and clamps the roving or sliver against the upper inlet roller, whereby the clamp segment is acted upon by an actuating element which causes its roving or sliver-clamping position, and the clamp segment is maintained in the position in which the roving or sliver clamping device is at rest by a holding element. The holding element includes means for storing energy and it positively counteracts the actuating element.

Abstract: A method of piecing yarn in the operation of an open end rotor spinning machine that includes applying the suction that picks up the yarn end from the bobbin package for an extended predetermined length of time longer than the optimal minimum length for a normal piecing operation, with the extended suction being of a time sufficient to remove an estimated extended length of defective yarn, either determined by sensing the absence of sliver or after two or three sequential unsuccessful piecing attempts.

Abstract: The yarn tension at each of a plurality of yarn processing stations is continuously monitored, while continuously determining the mean value of the monitored tension at each station, and while also continuously determining the differential between the monitored value and the mean value. Also, an alarm signal is generated whenever the mean value leaves a predetermined tolerance range, and whenever the differential value leaves a second predetermined tolerance range. An alarm signal may serve to actuate a visual error indicator, or to shut down the associated processing station.

Abstract: An open-end rotor spinning machine includes a plurality of spinning stations each including a first thread monitor monitoring a thread course and a rotor spinning device receiving a fiber supply and having a spinning element; an automatic thread joining device for joining a thread to be conducted to the rotor element, and a second thread monitor disposed on the automatic thread joining device for monitoring the thread course without placing a load on the thread when the first thread monitor is inoperative and the automatic thread joining device is operative, the automatic device delivering the second thread monitor and a thread to a location directly adjacent the spinning element, and the second thread monitor including a device for immediately interrupting the fiber supply to the rotor spinning device if the second thread monitor detects the absence of the thread.

Abstract: The invention relates to a thread movement sensor comprising an arm with at least one thread guide. The invention solves the problem of sensitivity of the sensor to the vibrations of the machine by making a part of the arm an element of a magnetic circuit of coil, the latter being connected to the control circuit of a knitting machine.

Abstract: Each of the operating stations is provided with a locating element while the service tender carries a sensor for aligning the service tender with a selected operating stations. The sensor includes a rotatable member on which a pair of rollers is mounted and from which a leaf extends to cooperate with various photodetectors. With the sensor in an operative position, the rollers sequentially contact the locating element of a selected operating station and by pivoting cause the leaf to cooperate with the photodetectors to generate a sequence of signals. This sequence of signals is used to slow the service tender and to thereafter brake the service tender to a halt in alignment with the selected operating station.Should the service tender overrun the locating element, signals are also generated to reverse the direction of movement of the service tender in order to effect alignment.

Abstract: For compensation of changes in rotational speeds, for example, occurring because of varying loads on the motors, the drive mechanisms for at least two kinds of working units have a common synchronizing mechanism and are connected operably by a torque transfer device. The torque transfer device comprises, for example, a drive belt and two drive pulleys, each of which is attached to a different drive mechanism. The common synchronizing mechanism can comprise either a common rotational speed control or an adjustable current supply for the motors of the drive mechanisms.

Abstract: The starting or re-piecing of a yarn in an open end spinning machine is accomplished during full speed rotation of the spinning unit. A travelling piecer provides a fixed length of yarn to be back-fed into the spinning unit. A control which is responsive to the speed of rotation of the spinning unit causes the nip rolls to close together in order to deliver the new yarn from the spinning unit at the operating speed of the spinning unit.

Abstract: Each of the spinning stations is provided with a profile locating element or marker as well as a signal lamp for indicating a disturbance in a spinning unit. The service tender carries a locating device which includes a spring biased body which is capable of moving perpendicularly to the direction of movement of the service tender towards a spinning unit to which the service tender has been called. The body carries a pair of rollers which are mounted on a pivotable turntable so as to be pivoted when passing over a locating element of a spinning station.The locating device serves to generate signals for braking the service tender to a halt in alignment with a selected spinning station.The service tender also carries an anchoring system which uses a plate coated with a layer of friction material for engaging a rail on which the service tender moves for securing the tender in an aligned position with a spinning station.