Abstract: In a device for opening fiber bales with a plucking device capable of travelling on rails alongside a row of bales and of being lowered upon the bales, as well as with a suction channel, suction nozzles (72, 73, 82, 83) which suck away fiber material having fallen into the travel path of the plucking devices are connected.

Abstract: A device for the control of an open-end spinning element, including a pivoted control lever (4) is provided which is capable of assuming three different working positions. In a production position the control lever brings a first drive, running at production speed, into driving contact in the operation of the open-end spinning element. In a braking position the control lever brings a brake to act upon the spinning element. The control lever in a piecing position brings a second drive which runs at a lower speed than the first drive into driving contact with the open-end spinning element. At least the positions determining the production and the piecing position of the control lever are provided with a common control element, capable of being moved back and forth in the direction of movement of the free end of the control lever between at least two switching positions.

Abstract: To piece with a spinning device having a pneumatic twisting unit, a yarn end is back-fed from an output side, through the twisting unit, to drawing equipment, and then inserted laterally into a pair of drawing unit output rollers, from where it is drawn off through the twisting unit in the form of a continuous yarn with a rove being incorporated into it. During the back-feeding of the yarn end to the twisting unit input side, the yarn end is conveyed to a grasping device located at the side of the drawing equipment. The grasping device pulls the yarn end for subsequent insertion into the pair of output rollers past such rollers until such end is alongside the drawing equipment. A yarn presenting device is provided to convey to the grasping device the yarn end leaving the twisting unit input side.

Abstract: In an open-end spinning device with a spinning rotor a compressed air conduit is provided for directing an air current upon the inner surface of the spinning rotor. This compressed air conduit is connected through a stop valve to a source of compressed air. The compressed air conduit is provided with a pressure control device which can be pre-set to at least two pressure levels. The pressure control device has parallel conduits of which one conduit is provided with a pressure reduction device for the low pressure.During the preparation of the piecing operation, compressed air, at high pressure, is fed into the spinning rotor to clean said spinning rotor. Subsequently, but before the start of fiber feeding into the spinning rotor, the compressed air is reduced to a lower pressure value and is finally switched off before the yarn is fed back into the spinning rotor.The invention includes the process for restarting the open-end spinning device.

Abstract: For a device for opening fiber bales, with an opening device capable of traveling on traveling rails along fiber bales set up in rows. A supporting wall is provided which is capable of being shifted in the direction of bale set-up. Orderly setting up of the fiber bales is ensured in a simple manner by means of the supporting wall.

Abstract: A spinning machine with unit to service spinning and winding stations, which is capable of travelling alongside the spinning machine and contains control and drive elements in a housing. The housing is enclosed by covers and is equipped with an anti-collision device taking effect in a direction opposite to the direction of travel. The anti-collision device of each direction of travel comprises two elements, of which the first element is attached to the lateral cover of the housing so as to be capable of pivoting. The first element is made to act as an actuating mechanism of the second element which acts upon the control elements.

Abstract: In a plucking device, capable of travelling back and forth, for the plucking of fibers from bales of fiber two toothed rollers are provided. One is located before, and the other after, the toothed plucking roller, their axes being parallel to the axis of the latter. The arc of the base diameter at the bases of the teeth of these toothed rollers is tangent to a plane which lies within or below the plane tangent to the arc of the outside diameter of the plucking roller. The device makes it possible to limit the plucking action securely without using grates and to maintain it constant over the entire surface of the bale.

Abstract: Apparatus for the removal by suction of fiber material on a movable bale opener which includes a suction channel with a fixed connection opening and a movable connection opening. The movable connection opening is part of a longitudinal slit in the suction channel, capable of being sealed by means of a covering band.In a space-saving arrangement which does not hinder the laying down of bales and makes it possible to remove the fiber material by suction in a pneumatically advantageous manner, the suction channel 3 is located in a plane above the bales B and the covering band 4, attached to the two ends of the longitudinal slit, 31 is held in sealing position by magnetic force.

Abstract: When a thread (10) supplied at a constant speed is wound onto a cross-wound bobbin (11), the variations in thread tension are compensated, and in addition predetermined thread-tension limiting values are prevented from being exceeded as a result of a change in the winding-on speed. A first regulating system (96) is provided for compensating periodic variations in the thread tension, while a second regulating system (51) is provided for compensating shifts in the range of thread tensions. The second regulating system is designed as a variable step-up gear (5), the drive part (60) of which is connected to a drive shaft (4) extending over several spooling stations. The output part (62) of this step-up gear (5) is connected to the spooling roller (3), the drive part (60) being connected to the output part (62) by means of a transmission member (61) which determines the gear ratio at any particular time and which is adjustable as a function of the thread tension.

Abstract: A fiber carding web emerging from a pair of crush rollers is taken off and is gathered into a fiber sliver by at least one endless conveyor belt which is guided by means of a first and a second guide roll and is tangent to the pair of rollers across their feeding width. In order to ensure that the carding web is taken off correctly when the relative axial position of the rollers to each other changes, the axis of the guide rolls is supported so that it can be locked in the changed axial position of the rollers and the conveyor belt is guided over a driving roll removed from the plane connecting the axes of the guide rolls.

Abstract: Disclosed is a drive apparatus for a device for applying paraffin wax to yarn. In the device, a solid block of paraffin is mounted on a polyhedral bolt which is driven by a whorl or drive pulley. The whorl, in turn, is driven by a continuous drive belt. Advantageously, a plurality of similar devices are mounted on the same open-end spinning machine so adjacent devices may be driven from the same drive belt. Bracing elements hold the yarn against the rotating face of the paraffin block of each device to ensure uniform application of paraffin.

Abstract: A thread-reserve winding is formed on a bobbin tube of a spinning machine in which the thread is drawn off continuously from the spinning machine by means of a pair of draw-off rollers and, to form the thread-reserve winding, is grasped and wound onto the bobbin tube. According to the invention, immediately after the thread has been grasped, the spinning tension is put into effect to wind on the thread-reserve winding and, after the thread-reserve winding has been applied, the thread is wound on under the normal winding-on tension. In this way, the thread is drawn off by the bobbin tube under a thread tension sufficient to ensure a taut winding.

Abstract: A thread (3) paraffining device employing a paraffin element (2) which is resiliently biased against a stop rail (6). The stop rail 6 extends transversely to the thread path direction and is arranged on one half of the end face (20) of the paraffin element (2) remote from the thread contact side. The paraffin element (2) has a diameter of at least 50 mm.

Abstract: To end or start the spinning operation on an open-end spinning unit by means of a switching device with which the connection to a spinning element or a delivery channel is alternately unblocked and blocked during the reversal of a switching device, the fiber flow is taken out of the region of the particular fiber path to be blocked, and only then is this region blocked. To influence the fiber flow, the volumetric flow rates of suction air flowing through the switching device are controlled. The switching device (6) has at least one closing member (60) with a first orifice (61) which leads to the spinning element (1) and the cross-section of which is enlarged geometrically in a discontinuous manner in the direction of the orifice opening, and with a second orifice which leads into the delivery channel (51) and the cross-section of which is reduced geometrically in a gradual way in the direction of the orifice closure.

Abstract: In a pivotable suction tube (3) for taking up a yarn from a bobbin, there is provided for transfer of the yarn to an operating element, on its side facing the bobbin, an elongate slot (32), with which is associated a controllable closure piece (33, 35) extending over at least a substantial portion of it. The suction tube (3) possesses a tubular section (30) having a shape being symmetric to its axis with which is associated as a closure piece a rotatable slider (33) provided with an axial slot (330). The closure piece (33, 35) carries a stop (333, 352) with which is associated a counter-stop (20, 410) which becomes effective in dependence on the pivoting motion of the suction tube (3).

Abstract: An overhung mounted rotatable centering spindle (5) for centering a yarn (1) at an open-end spinning location is disclosed having a central groove (52) into which threaded grooves (500, 510) run together oppositely from both sides. The direction of rotation of the centering spindle (5) is reversible. Both threaded grooves have different core diameters (d.sub.1, d.sub.2), the smaller core diameter (d.sub.2) being towards the free end of the centering spindle (5) so that the yarn is immediately and with certainty ejected from the free end of the spindle during reverse rotation.

Abstract: Apparatus for sealing a rotor housing of an open-end spinning machine is disclosed wherein the housing is under a reduced-pressure and includes a bore through which a rotor shaft of the spinning rotor extends. The apparatus includes a mounting carried by the rotor housing for floatingly mounting a sealing washer relative to the bore of the housing and a counter-surface carried adjacent the reduced-pressure side of the housing against which the sealing washer is abutted and maintained by the reduced pressure in the housing.

Abstract: An apparatus for opening bales of fibers using a gripper which detaches a layer of fibers from the top of a bale and then moves upwardly. A hold-back device is provided for grasping a web of fibers hanging down from said gripper device after the gripper device has been raised with the detached fiber material.

Abstract: A method an apparatus for opening and mixing the fibers from a plurality of bales according to a predetermined mixture. The device includes tongs-like gripper means which press into the fiber bales for removing fibers therefrom. A measuring means and a control means determine the width of opening of the gripper means. A control circuit is provided for receiving a signal representing the weight of the first pick-up from a particular bale and the weight of the fibers deposited in a receiver container. When the sum of these signals is equal to the preset desired weight of the fibers that are to be deposited in the receiver container, a compared signal is produced causing the tongs on successive pick-ups to be opened to a lesser degree. As a result, a high degree of accuracy is obtained when mixing to a predetermined ratio while maintaining a high production output.

Abstract: A core thread is combined with staple fiber in a spinning rotor by feeding the core thread to form a loop in the fiber collection surface while feeding and withdrawing the core thread in a manner to maintain it substantially linear, and the stable fiber is spun into an outer yarn shroud twisted about the axis of the core thread. The core thread feed tube is located at one side of and spaced from a diametral plane through the fiber collection surface, and the fiber feed tube is located at the opposite side of and spaced from such plane through the fiber collection surface. A loop is formed in the core thread by delaying startup of drawoff rollers for a predetermined interval after startup of core thread supply rollers, and the loop is laid on the circumference of the fiber collection surface by rotation of the spinning rotor.