Abstract: An autoleveller draw frame achieves changes in the draft by changing the supply speed. The can press nevertheless works evenly. A storage device between the sliver calenders and the can press compensates for changes in the amount of supplied sliver. The storage device can be arranged in such a way that it allows a "flying change of cans." In one aspect, between the sliver calenders and the can press, the sliver forms a hanging loop which varies in depth, depending upon any changes in the supply speed of the sliver, while the can press operates relatively evenly and is not required to be accelerated or braked in response to changes in the supply speed. In another aspect, the storage device includes a conveyor belt arrangement between the supply of the sliver and the can press. Sliver loops are formed on an upper conveyor belt strand, whereafter they are deflected to a lower conveyor belt strand and then fed to the can press.

Abstract: A ring spinning machine comprises at least one group of spinning stations or points (11) arranged adjacent each other at equal intervals, a bobbin change device (14) for simultaneous replacement of full bobbins (15 ) spooled with yarn by empty bobbins (16) at each spinning point (11) and an endless conveyor (17) which extends along the spinning points (11) and is led from one end of the spinning point group (12) to the other back on itself and on which at the interval of the spinning points (11) upright bobbin pegs (13) are arranged in such a manner that in a bobbin change position of the endless conveyor (17) each spinning point (11) is exactly aligned with a bobbin peg (13) associated individually therewith. Each bobbin peg (13) is arranged on its own peg support tray (18).

Abstract: A combing head comprises carrying and drive rollers for the lap roll, a cylinder, a detaching roller pair and nippers reciprocable between a drawn-back position and an advanced position. When the trailing end of the lap material runs off the winding tube, the combing machine is stopped at a time after the detaching roller pair have detached a fringe from the lap in the nippers and after the fringe has been separated from the lap. The lap trailing end and the empty winding tube are then removed and a new lap roll is placed on the carrying and drive rollers. Lap material is unwound from the new lap roll until the start of the lap has passed beyond the nip line of the nippers. The combing machine then restarts. The method can, if required, be performed substantially or completely automatically and calls for only a short machine down time.

Abstract: The bearing unit comprises a plurality of bearing elements rotatable relative to each other. A shell encircles the plurality of bearing elements. A body of resiliently compressible material is located between the shell and the plurality of bearing elements and possesses a predetermined compressibility. This body of resiliently compressible material retains the plurality of bearing elements relative to the shell and permits free adjustment of the plurality of bearing elements relative to the shell within limits determined by the predetermined compressibility of the resiliently compressible material.

Abstract: There are formed at the wall of the friction spinning element bores or holes with a predeterminate bore diameter and a coating on their side facing a fiber feed duct, the coating extending over the bore edges into the bores or holes. Each bore or hole thus formed has a diameter at the bore or hole entrance or inlet which is smaller than the bore diameter of the related bore or hole. Each bore or hole has a cross-sectional area of less than 0.283 mm.sup.2, but amounting to at least 0.07 mm.sup.2. In this way, the undesirable penetration of fibers or fiber parts into the bores or holes is prevented as far as possible when air flows through the bores or holes at the side of the coating, while retaining a hole form or configuration which is favorable from the standpoint of airflow and blockage of the bores or holes.

Abstract: The wall of the friction spinning element has bores or holes with a predeterminate bore diameter and a coating on their side facing a fiber feed duct, the coating extending over the bore edges into the bores. Each bore or hole thus formed has a diameter at the bore or hole entrance or inlet which is smaller than the bore diameter of the related bore or hole. Each bore or hole has a cross-sectional area of less than 0.283 mm.sup.2, but amounting to at least 0.07 mm.sup.2. In this way, the undesirable penetration of fibers or fiber parts into the bores or holes is prevented as far as possible when air flows through the bores or holes at the side of the coating, while retaining a hole form or configuration which is favorable from the standpoint of airflow and blockage of the bores or holes.

Abstract: The method of, and apparatus for, producing a yarn uses a friction spinning device comprising a perforated first friction spinning drum and a second friction spinning drum which can also be perforated. Two fiber feed passages project to the first friction spinning drum and are each supplied by opening assemblies which individualize or individually separate the fibers. The fibers are transported toward the first friction spinning drum using a feed air stream in the fiber feed passages. This feed air stream is produced by the first friction spinning drum which is maintained under sub-pressure. Advantageously, the fiber double-feed to the friction spinning drum permits supplying two different fiber types to the same yarn end. Also, different inclinations of the fibers at the friction spinning drum can be obtained by different inclinations of the fiber feed passages in order to produce yarns of different character.

Abstract: In the manufacture of friction spinning drums, in order to be able to select the size of the holes or perforations, on the one hand, to oppose technological fiber loss and jamming of sucked in foreign particles and, on the other hand, to provide airflow advantages, it is proposed to manufacture the friction spinning drum from a thick-walled support and a thin-walled perforated body. As a result, holes or perforations having a sufficiently small cross-section to counteract the above-mentioned fiber loss can be formed in the thin-walled perforated body. On the other hand, holes or perforations having a large enough cross-section to prevent jamming of sucked in foreign particles or other contaminants can be provided in the thick-walled support.

Abstract: A tube-supporting cradle mechanism for a filament, especially a yarn or thread take-up system is provided with a resiliently deformable body enabling relative adjustment of relatively rigid parts which adjoin the resiliently deformable body in order to permit line contact between a bobbin tube or its package wound thereupon, which is supported by the cradle, and a friction drive roll.

Abstract: A package holder for use in winding yarn packages comprises at least one arm adapted to support a bobbin tube and pivotable about a first axis as a yarn package is formed on the tube. The arm is also pivotable about a second axis extending transversely to the first axis to make it possible to install or remove the bobbin tubes or packages. A first member is provided which is movable with the arm during the pivoting movement thereof about the first axis. A second member is engaged by the first member and is so mounted that relative movement of the first and second members occurs during the pivoting movement of the arm about the first axis.

Abstract: The method of, and apparatus for, producing a yarn uses a friction spinning device comprising a perforated first friction spinning drum and a second friction spinning drum which can also be perforated. Two fiber feed passages project to the first friction spinning drum and are each supplied by opening assemblies which individualize or individually separate the fibers. The fibers are transported toward the first friction spinning drum using a feed air stream in the fiber feed passages. This feed air stream is produced by the first friction spinning drum which is maintained under sub-pressure. Advantageously, the fiber double-feed to the friction spinning drum permits supplying two different fiber types to the same yarn end. Also, different inclinations of the fibers at the friction spinning drum can be obtained by different inclinations of the fiber feed passages in order to produce yarns of different character.

Abstract: The method of, and apparatus for, producing a yarn using a friction spinning device comprising a perforated first friction spinning drum and a second friction spinning drum which can also be perforated. Two fiber feed passages project to the first friction spinning drum and are each supplied by opening assemblies which individualize or individually separate the fibers. The fibers are transported toward the first friction spinning drum using a feed air stream in the fiber feed passages. This feed air stream is produced by the first friction spinning drum which is maintained under sub-pressure. Advantageously, the fiber double-feed to the friction spinning drum permits supplying two different fiber types to the same yarn end. Also, different inclinations of the fibers at the friction spinning drum can be obtained by different inclinations of the fiber feed passages in order to produce yarns of different character.

Abstract: A package holder for use in winding yarn packages comprises at least one arm adapted to support a bobbin tube and pivotable about a first axis as a yarn package is formed on the tube. The arm is also pivotable about a second axis extending transversely to the first axis to make it possible to install or remove the bobbin tubes or packages. A first member is provided which is movable with the arm during the pivoting movement thereof about the first axis. A second member is engaged by the first member and is so mounted that relative movement of the first and second members occurs during the pivoting movement of the arm about the first axis.

Abstract: In a false twist spinning unit a fiber sliver is removed from a fiber sliver can and fed into a drafting mechanism. The fiber aggregation delivered by the drafting mechanism is received by a suction portion of a spinning unit and is passed to a twist-imparting element which produces a spun yarn. The spun yarn is withdrawn by a roller pair and passes via a yarn monitoring device to a winding unit. The suction pressure required for the suction portion is produced by a suction device. In the event of blockage of the suction portion, a cleaning element or device is activated. After cleaning of the suction portion is completed, spinning is restarted.

Abstract: To piece up a yarn in a friction spinning device, fibers supplied to a yarn formation position of a friction spinning drum are twisted to form a twisted fiber structure until the latter has sufficient strength for grasping by a suction device moved towards the twisted fiber structure end opposite to yarn withdrawal. The suction device grasps this end and stops such twisted fiber structure. Further fibers wound about the now substantially stationary twisted fiber structure strengthen the so it can be withdrawn by the suction device. Due to such withdrawal and constant further supply of fibers, a yarn-like structure is formed adjoining the twisted fiber structure and such yarn-like structure is also withdrawn. To subsequently again form the actual yarn, withdrawal rollers are engaged so the yarn produced at the yarn formation position is withdrawn at production speed or with a reduced speed still sufficient for forming a yarn.

Abstract: A process for the production of methoxyanthraquinones of high purity by reaction of nitroanthraquinones with methanol and alkali, in the presence of alkali-resistant nitrous acid inhibitors.