Abstract: As an alternative to an expensive bus system commonly utilized in multi-station automatically operating textile machines for exchange of data between a central control device and local control devices at the individual work stations, the present invention provides a central control device disposed on a traveling service unit which can be positioned sequentially at each work station, particularly in the course of a restart of the textile machine, for transmitting data between the central control device and the individual control device of each work station, e.g., for supplying control data to the work stations, for collecting event data, production data and yarn quality data from the work stations, and for assimilating the collected data when the service unit is positioned in front of a work station.

Abstract: An open-end spinning device with a forwardly open suctioned rotor housing, a high speed spinning rotor rotatably disposed in the rotor housing, and a fiber conduit plate for closing the forward opening in the rotor housing. The fiber conduit plate has an interchangeably disposed conduit plate adapter defining an opening from a fiber guide conduit into the rotor and a yarn take-off nozzle. The conduit plate adapter can be releasably fixed securely in place in a receptacle area of the fiber conduit plate by means of a central fastening arrangement comprising a threaded connection and a magnetic coupling between the fiber conduit plate and the conduit plate adapter.

Abstract: At each work station of a textile machine producing wound bobbins, the yarn package on which yarn is wound is driven by a friction roller. In contrast to the conventional driving of the roller by a gear motor flanged to the housing of the work station, which has the disadvantage of requiring space and difficulty in removing and replacing the friction roller for maintenance, the present invention simplifies the friction roller drive by configuring the housing of the work station for the direct reception of the stator windings of the drive motor for the friction roller and mounting the friction roller and the rotor of the drive motor together on a continuous shaft.

Abstract: An electric circuit for the conversion of a multiplicity of commercial power voltages to a predetermined supply voltage which is independent of the respective commercial power voltage, for a device with high electrical power requirements of high output, in the range up to 40 kW, such as a bobbin winding machine. The circuit contains a rectifier stage for generating a primary intermediate circuit DC voltage, a converter stage with power switches for generating a rectangular AC voltage, a high-power transformer with a connected secondary control circuit and a control stage which triggers the power switches at zero voltage in a phase-shift mode with a variable frequency and pulse width of the rectangular AC voltage as a function of the input voltage of the rectifier stage, the transformer primary winding current and both the voltage and the current in the secondary intermediate circuit.

Abstract: A sliver can with improved coupling elements for raising and lowering the bottom wall of the can during filling and otherwise manipulating the cans by can transport vehicles wherein the coupling elements are disposed within the laterally outermost contour of the can and are configured in conjunction with the width of associated guide slits in the side wall of the can to receive laterally movable can manipulators, e.g. on a can transport vehicle, for interlocking connection for transmitting upward movement of the manipulators to the bottom wall of the can and, optionally, lateral movement of the manipulators to the can for pushing and pulling movements.

Abstract: A method used in conjunction with a yarn splicing device having a pneumatic splicing chamber, a compressed air line connecting the splicing chamber to a source of compressed air, an electromagnetic splicing valve disposed within the compressed air line and having two transitional positions (open and closed) for controlling delivery of the compressed air to the splicing chamber, and a control unit connected to the valve for initiating a transitional signal to the valve for opening and closing of the valve, the method including, after initiating the transitional signal to the valve, the steps of determining a value representing a characteristic of the changing air pressure prevailing in the compressed air line resulting from a transition of the valve from the open position to the closed position, comparing the determined value with a reference value, and generating an error signal if the difference between the determined value and the reference value is greater than a predetermined variance value.

Abstract: A pot spinning method and apparatus wherein a spinning pot rotates during spinning about a vertical axis while an associated yarn guide tube delivers fiber material through an exit mouth of the yarn guide tube onto the rotating inside surface of the spinning pot in the form of a revolving extent of the yarn which also rotates about the axis of the spinning pot. A yarn break or unacceptable changes in quality of the spun yarn can be ascertained extraordinarily quickly if deviations in the duration of the revolution of the yarn extent at the mouth of the yarn guide tube are monitored.

Abstract: A textile machine includes a cheese or cross-wound bobbin winder with winding stations each having a creel for holding a cheese, a reversible rotary cheese drive, a suction nozzle and a swivel drive for swivelling the suction nozzle to the jacket surface of the cheese. A method for grasping a yarn end resting on the cheese includes adjusting a search time during which the inward-swivelled suction nozzle is positioned at the reverse-rotating cheese, in dependence on the instantaneous diameter of the cheese, and on the reverse speed of the rotary cheese drive, which is kept constant over the entire search time.

Abstract: A traverse mechanism for a cheese producing textile machine includes a traverse housing having a longitudinal slit formed therein, a drive drum rotatably disposed within the housing, two yarn guides respectively disposed to move along the slit adjacent one another, with one of the yarn guides having a shuttle element disposed within the housing in driven connection with the drum, and a compound sealing slit covering element extending between and connecting two adjacent yarn guides for coupling the two yarn guides to be moved in unison upon driving of the shuttle element by the drum, the compound sealing slit covering element thereby also covering the slit to prevent dust and debris from entering the housing.

Abstract: In order to regulate the thread tension force of a traveling thread to a predeterminable set value, a comb tensioner with stationary thread guide elements and displaceable thread guide elements is provided, wherein the displaceable thread guide elements can be displaced by means of an electrodynamic drive mechanism which has a current-force-proportional characteristic curve and whose current supply is changed by a thread tension force regulating device, whereby the comb tensioner is employed both in a function as a thread tension force sensor and in a function as a thread tensioner.

Abstract: An automatic package doffer of a textile winding machine includes a yarn engaging device and a travel limiting device. The yarn engaging device includes a pivot housing and a movably hinged yarn lifter head and is seated on a pivot and bearing shaft in a partially rotatable and axially displaceable disposition. A yarn catcher plate, clamping shears, and a yarn guide plate are disposed on the yarn lifter head. The yarn engaging device also includes a stop element for engaging the housing of a respective winding station for stopping movement of the yarn engaging device at a first predefined position with respect to the winding station housing. The travel limiting device includes a clamp assembly that is clampable to the yarn engaging device when at the first predefined position and guide rails attached to the doffer upon which the clamp assembly is slidably disposed. A pneumatic cylinder selectively causes the clamp assembly to clamp onto a braking tube that is part of the yarn engaging device.

Abstract: A method for avoiding ribbon windings in the winding of a cross-wound bobbin or cheese includes driving the cheese with a drive drum having reversing thread grooves for yarn guidance. A circumferential speed of the drive drum is continuously varied. The cheese is accelerated with the drive drum so that the cheese follows a course of motion of the drive drum with slip. A rotary speed of a drive motor is monitored with a winding station computer. The drive drum is driven with the motor acting as a moment adjuster in terms of control technology. A command value specification of a current is fed to a current regulator through the winding station computer for accelerating the drive drum with a constant preselectable moment and for braking the drive drum with another constant preselectable moment, for generating the slip between the cheese and the drive drum being varied for preventing a match in a rotary speed ratio between the drive drum and the cheese that causes ribbon windings.

Abstract: A pneumatic cleaning device (10) for the spinning stations of an open-end spinning machine (1) is disposed on the sliver draw-in arm (22) of a traveling service unit (16) for unitary movement with the draw-in arm between a resting position (I) and an operating position (II). In the operating position (II), two suction nozzles of the cleaning device are positioned in the area of the sliver opening device of a spinning station at which the service unit is positioned. One suction nozzle is pivotable by an electric motor drive acting through a lever linkage arrangement to cover the area below the dirt outlet opening of the sliver opening device.

Abstract: In the automatic transport of rectangular spinning cans between a can filling station and the work stations of textile machines which process sliver, it is known to arrange a can storage device in association with the can filling station, with a section of the can storage device for receiving empty cans from a traveling can transport vehicle and a section for storing and transferring full cans to the can transport vehicle, and with the can filling station between these two sections. The present invention contemplates the ordered and positionally exact transfer of the cans to and from the can transport vehicle by transferring of empty cans from the can transport vehicle to the empty can storage section such that the transferred empty cans immediately follow the empty cans already stored thereat. In the transfer of full cans to the can transport vehicle, a leading one of the full cans to be transferred is transferred into a corresponding leading one of the occupyable parking spaces on the can transport vehicle.

Abstract: A method for monitoring a traveling yarn at a winding station of an automatic winding machine having an electronic slub catcher which produces an AC voltage signal proportional to a dynamic yarn signal responsive to yarn movement and a yarn cutting signal responsive to a fluctuation in yarn dimension outside a predetermined tolerance range includes the steps of producing a static yarn signal responsive to the presence of yarn in the electronic slub catcher, monitoring and evaluating the static yarn signal, producing a separating signal responsive to the absence of static yarn signal due to the absence of yarn from the slub catcher and monitoring and evaluating the separating signal.

Abstract: A sliver-processing system has at least one sliver-processing textile machine with at least one work station, at least one discharge station for filled sliver cans and a discharge station for empty cans. A sliver can assembly includes a sliver can with a round cross section commuting back and forth between the at least one discharge station for filled sliver cans and the discharge station for empty sliver cans. A polygonal pallet is connected to the can and has a position for a starting sliver end being definitively fixed relative to the can and relative to the pallet for automatic insertion at the at least one work station.

Abstract: There are dynamic sensors whose plunger is seated in the center of at least one diaphragm. In certain instances of use it is not possible to protect the sensitive diaphragms against inappropriate handling. For example, dynamic sensors are employed in the textile industry as yarn tensile force sensors. The diaphragm in which the yarn feeler is seated, which faces the yarn travel path, cannot be protected by means of a cover against unintentional touching, since dust accumulations between the cover and the diaphragm can hamper its function. For protecting the diaphragm it is therefore proposed in accordance with the invention that a support body is disposed a short distance behind the diaphragm and that the side of the support body facing the diaphragm has a support contour which is essentially matched to the contour on the side of the diaphragm facing the support body.

Abstract: A pot-spinning machine is equipped with a rewinding tube mounted on each yarn guide and with a central, common shogging drive of the yarn guides at one side of the machine. After a yarn break or similar interruption in spinning, in order to be able to initiate the rewinding operation immediately at the affected spinning station while simultaneously continuing the spinning process unchanged at the neighboring spinning stations, the shogging motion of the yarn guide is separated from the motion of the rewinding tube supported on the yarn guide, so that the rewinding tube is then moved only at the forward indexing speed of the yarn guide which is relatively slow compared with the shogging speed and which does not affect the rewinding of yarn onto the rewinding tube.

Abstract: A pot spinning machine holds a yarn rewinding tube in ready position during the spinning operation for immediate movement to an operative rewinding position in the event of a yarn break so that the broken end of yarn is not lost by winding onto the yarn cake already formed in the spinning pot and the yarn cake may then be properly rewound. The yarn break is detected with the aid of a yarn sensor which then emits a signal for immediately moving the rewinding tube into the rewinding position and clamping the yarn end. The rewinding operation can begin, even in the absence of a loose end of the yarn, if the yarn has assumed the form of a chord-like yarn segment extending substantially in the circumferential direction against the inner face of the yarn cake deposited onto the inside wall of the pot, which can be grasped and utilized to initiate the rewinding operation.

Abstract: A creel relief device (1) for exerting a relatively constant pressure of a cheese (24) on a yarn guide drum (6) in a textile cheese producing machine over the course of building the wound diameter of the cheese. The creel relief device (1) has two meshing toothed segments (10 or 14) respectively disposed on lever elements (8 or 15), one lever element (8) being connected with the creel shaft (7) securely against rotation relative thereto, while the other lever element (15) is pivotably mounted to be acted upon by a prestressed tension spring (19) extending between the lever element (15) and a setting lever (21), which can be locked in different positions for predetermining torque to be applied to the creel.