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: A transport belt for transporting a fiber strand to be condensed through a suctioned condensing zone of a spinning machine, an air-permeable, woven transport belt is provided. This transport belt is driven on the one hand by means of a friction drive of a nipping roll and on the other hand slides at the same time over a stationary sliding surface. The transport belt is woven from fine threads in such a way that, despite a small mesh width, a good flow rate of air is achieved. At regular intervals, coarser threads are woven in transversely to the transport direction, whose structure is such that the friction between a nipping roller, which effects the friction drive, and the transport belt is increased.

Abstract: A condensing zone for condensing a drafted fiber strand is disposed downstream of a front roller pair of a drafting unit of a ring spinning machine. The condensing zone comprises a stationary sliding surface having a suction slit, over which the fiber strand is transported by an air-permeable transport belt. The condensing zone is bordered on its exit side by a nipping roller disposed on the transport belt. The nipping roller drives the transport belt and is in turn driven by the front pressure roller of the drafting unit. The front pressure roller is, for this purpose, connected with the nipping roller via a drive belt, preferably a toothed belt. The nipping roller and the front pressure roller are arranged on supporting arms which can be spread apart and which tension the drive belt.

Abstract: Spindles of spinning and twisting machines have a rotatable shaft supported in a bearing housing. The bearing housing comprises a neck bearing, a step bearing as well as a radially movable step bearing tube, which is arranged in an oil bath. The diameter of the shaft at the step bearing tube measures at the most six times the diameter at the neck bearing. Preferably, the diameter at the step bearing tube measures no more than between 3 and 3.5 mm. Thus the absolute bearing clearance in the step bearing tube can be significantly reduced, which results in a quieter running of the spindle and to a reduction in power consumption for the drive.

Abstract: A step bearing is provided to axially support a shaft of an open-end spinning rotor, having a step bearing housing with a freely rotatable supporting ball, against which the end of the shaft is supported. The step bearing housing has a take-up space in the form of a lubricating grease reservoir in which the supporting ball is located. A lubricant distributor is arranged at the take-up space and is movable relative thereto.

Abstract: A ring spindle assembly and process for re-lubricating a ring spindle having a vertically arranged bearing housing with a closed bottom. A step bearing is arranged in an oil-bath of the bearing housing for a rotating shaft. In the bearing housing, at least two lubricating channels are provided above the desired oil level of the oil-bath. When the shaft remains in the bearing housing, oil is filled into one lubricating channel until oil comes out of the other lubricating channel. A certain amount of oil is subsequently sucked out through the lubricating channel, so that the oil reaches the desired level.

Abstract: For piecing a yarn end at a spinning station of an open-end rotor spinning machine, the previously stopped feed roller is re-activated for a short pre-feeding period. The fiber beard, which has been thinned out by the still rotating open roller, can thus renew itself. The fibers which are combed during this pre-feeding period are removed as waste when the spinning rotor is at a standstill. After completion of the pre-feeding period, the feed roller is rotated in reverse so far back until the fiber beard leaves the area of effect of the opening roller. The feed roller is activated again for the actual piecing process.

Abstract: An arrangement is provided for sealing the opening of a rotor housing under a low pressure, through which opening a shaft for a spinning rotor extends, which shaft is supported outside of the rotor housing. This arrangement comprises a sealing disk, which is supported floating relative to the opening and which is pressed against a bearing surface by means of a spring element. The floating sealing disk comprises a through bore hole having a narrow tolerance relative to the shaft. The spring element presses against the effect of the low pressure.

Abstract: A condensing zone lies downstream of the front roller pair of a drafting unit of a spinning machine, in which condensing zone a drafted fiber strand is condensed. The condensing zone comprises a sliding surface having a suction slit, which sliding surface serves as a guide for a circulating, perforated transport belt. The transport belt transports the fiber strand to a nipping roller, which presses the fiber strand and the transport belt against the sliding surface. The nipping roller is connected to a drive, from which drive said nipping roller can be cut off in age the case of a break in the transport belt.

Abstract: A procedure is described in which an open-end rotor spinning machine already in operation can be modernized by means of re-equipping it with new parts. This machine comprises device means for interrupting the spinning process at a spinning station for the purpose of a doffing operation. The machine comprises a doffing arrangement which is movable relative to the spinning stations, which doffing arrangement comprises devices for exchanging a full bobbin for an empty yarn-winding tube. The machine comprises further at least one piecing arrangement movable in relation to the spinning stations, which is designed to restart spinning at the spinning station with a starting winding already connected to the yarn-winding tube. It is an object of the modernization that the piecing arrangement is replaced with a new piecing arrangement, which is designed to restart spinning with a starting yarn which is not connected to the yarn-winding tube, and subsequently to attach a newly spun yarn to the yarn-winding tube.

Abstract: The supporting disks for supporting disk bearings of open-end spinning rotors comprise a tire or ring with damping properties, as well as an essentially cylindrical running surface. In order to avoid heat build-up, the running surface is interrupted by two grooves, thus dividing the running surface into one inner and two outer sectional surfaces. The outer sectional surfaces are each wider than the inner sectional surface by 20 to 40%.

Abstract: In the case of a rotor cup for an open-end spinning aggregate comprising a rough-surfaced fiber collecting groove and a smooth fiber sliding surface it is provided that hard particles are rolled into the fiber collecting groove. The fiber collecting groove is preferably provided with a soft nickel plating before the particles are rolled in, after which the nickel plating is then hardened.

Abstract: Traversing rods for a yarn traversing device on textile machines producing cross-wound packages extend over a plurality of winding stations and are subjected alternately to tension and compression. The traversing rod is driven at one end by a traversing drive, and at a distance therefrom, for example at its other end, is driven by an auxiliary traversing device for accelerating its return of motion. This auxiliary traversing device is effective in both directions of motion of the traversing rod, and operates synchronous with a signal given by the traverse drive such that the length changes of long traversing rods are taken into account.

Abstract: A flexible sealing ring is arranged at an opening roller of an open-end spinning machine which rotates in a chamber of a housing connected to a vacuum source, which sealing ring is supported concentrically to the opening roller in the housing. In order to seal the chamber against the open atmosphere, the sealing ring comprises a sealing lip, to which a sealing surface of a collar of the opening roller is arranged. The sealing ring is disposed, under the action of the pressure drop present between the open atmosphere and the chamber, on a stopping surface which determines the operational position of the sealing ring, which stopping surface is itself arranged preferably at the housing, while, however, in some embodiments, it is arranged at the opening roller itself. The sealing lip defines the smallest diameter of the sealing ring, which is larger than the diameter of the combing structure of the opening roller.

Abstract: The adjacently arranged spinning aggregates of an open-end spinning machine are each provided with an opening device, which includes a removal opening for trash particles. A channel extending in the machine longitudinal direction takes up the trash particles. A sliding carriage traverses in the channel, which sliding carriage is coupled to a belt-like traction mechanism and which pushes the gathered trash particles ahead of itself to a suction point. The channel is wider than the distribution area of the trash particles in this direction. A clearance area occurs hereby in the channel, in which the traction mechanism extends.

Abstract: Traversing rods for yarn traversing devices on textile machines producing cross-wound packages extend over a plurality of winding points and are subjected alternately to tension and compression. The traversing rod is driven at one end by a traversing drive, and at the other end is connected to an energy storer for aiding its return of motion, which energy storer is effective in both directions of movement. As long traversing rods are continually subjected to length changes, which impede the correct build up of the packages, the return motion points of the traversing rods relative to the position of the energy storer are continuously monitored by a measuring device. The energy storer is connected to an adjusting device coupled with the measuring device and thus automatically adjustable.

Abstract: In the case of a spindle for spinning or twisting machines, two housings, separated by an annular gap, are provided, namely an outer housing, secured to a spindle rail, and an inner housing which takes up the neck bearing and the step bearing for the shaft by means of supporting parts. The inner housing is connected to a supporting portion by a flexible joining piece, which supporting portion is adjustable and clampable onto the bottom surface of the outer housing. The bottom surface takes at least approximately the shape of a ball cup, whose center point is at most 30 mm away from the upper edge of the outer housing in vertical direction.

Abstract: Supporting disks are provided for a supporting disk bearing for open-end spinning rotors, which supporting disks have an essentially cylindrical running surface defined by encircling border edges. The running surface is provided with a helically shaped groove comprising at least two turns. The starting point of the groove as well as the end thereof have an eased runout which is at a distance to the respective border edge.

Abstract: An upper spindle part of a textile spindle for spinning or twisting machines comprises a sleeve made of a thin-walled metal tube and produced by cold press molding. A spindle shaft is inserted into the sleeve. The sleeve comprises a drive wharve formed in one piece therewith. The sleeve is produced by stretch forming and provided with at least one take-up surface for the insertable spindle shaft. The upper part of a spindle can thus be produced cost-effectively and with a high level of precision.

Abstract: In the case of an open-end spinning aggregate, an opening roller rotates in a housing which comprises a device for cleaning fiber material. A trash removal opening is provided between a sliver feed point and a fiber delivery point in the circumferential wall which surrounds the opening roller, which trash removal opening opens out into the atmosphere. Directly downstream of the trash removal opening, but at a distance upstream of the fiber delivery point, there is a second opening which opens out into the atmosphere and which is purely an air inlet opening. By means of this air inlet opening, the speed of the air flow entering the trash removal opening is reduced, so that even small trash particles, to which fibers may adhere, are removed.