Abstract: When a thread is joined in an open-end spinning device, the thread is fed back into the open-end spinning device as a result of reverse rotation of a bobbin and a pair of auxiliary rollers. After the feedback has ended, the thread is released by the pair of auxiliary rollers and, until normal spinning draw-off is started, the thread is subjected to an auxiliary draw-off at a greater distance from the open-end spinning device than the normal spinning draw-off. This auxiliary draw-off can be carried out exclusively by means of the bobbin or also independently of it. An auxiliary draw-off device serves for generating this drawing force and is located at a greater distance from the open-end spinning device than the pair of draw-off rollers.

Abstract: A slide gate valve having a flangeless housing clamped between the ends of two pipelines which housing has an inner chamber, enlarged between the ends of the pipelines, for accommodating a stationary valve plate. An associated displaceable valve plate is provided with an annular insert having approximately the same inside diameter as the adjacent pipeline on the discharge side in the housing, against which insert the stationary valve plate is supported as a seal in a small annular area opposite the sealing surface between the insert and the pipeline. The remaining area of the stationary valve plate is free of support from both the insert and the housing.

Abstract: To stop and restart and open-end spinning machine with a plurality of spinning devices, all the spinning devices are stopped together, while the vacuum is maintained. The thread end resulting from this interruption in the spinning process is then prepared successively at each spinning unit for joining and is fed to the spinning device in a thread-joining position, whereupon the vacuum is then cut off. When the open-end spinning machine is started, after the vacuum has first been applied, the threads are fed together, on all the spinning devices to the fiber-collecting surfaces of the spinning devices. The open-end spinning machine has a service device movable along the machine for preparing the threads to be joined and for feeding them to the individual spinning cells, as well as a central control device which has a stoppig device and a starting device for the open-end spinning machine. The stopping device is connected in control terms to a switch-on device and to a switch-off device for the service device.

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 process for rejoining the thread on an open-end friction-spinning device, in which fibers are fed into a V-shaped nip subjected to suction, and the thread formed in the V-shaped nip is drawn off from this and wound onto a bobbin. For rejoining, the fiber feed into the V-shaped nip is interrupted and a thread end drawn off from the bobbin is guided towards the V-shaped nip counter to the spinning direction. This thread end is paid out in front of the V-shaped nip and is stored in a joinable length in a storage station at the end of the V-shaped nip facing away from the bobbin. The bobbin is then advanced towards its drive roller and the thread is drawn off from the storage station. After a predetermined time after the start of the thread draw-off, the fibers are fed again into the V-shaped nip, where they come up against the thread end running through the V-shaped nip and are twisted together with this.

Abstract: A method and apparatus for slipping tubes on pegs carried on a transport belt which extends along a spinning machine or twisting machine. A slipping-on apparatus for said tubes is located above the transport belt and inserts the tubes on the pegs. A sensing device monitors the seating of the tubes on the pegs and a lifting off device removes the tubes that are improperly seated on the pegs. After an improperly seated tube is removed from the peg, another tube is inserted thereon.

Abstract: A mobile supply station (7) is connected by flexible supply lines (10, 11) to a stationary connection point (1). The flexible supply lines (10, 11) are supported by a guide chain (2), the surplus length of which is taken up and laid down in a loop (21) during the movement of the supply station (7). The curvature of the loop (21) is dictated by a return wheel which rolls freely upon that part of the guide chain (2) connected to the stationary connection point (1).

Abstract: In a textile machine, roller cleaning is carried out by means of a stripping knife, the front edge of which is pressed against the surface of the roller in the working position. The stripping knife, while maintaining its contact with the roller, is moved intermittently from this working position into a second working position in which the knife body touches the roller and the front edge of the knife is spaced apart from the roller. Fibers and impurities which have accumulated at the front edge as well as fibers jammed between the front edge and the roller are released as a result and are conveyed away by the roller thereby providing uninterrupted roller cleaning.

Abstract: The yarn (31) is fed substantially tangentially from a feed station (30) to the feed end (101) of an accumulator roller (10) of a yarn accumulator (1), drivable by a rotary drive means (120). The yarn is dischargeable from an exit end (103) of this accumulator roller (10) counter to the action of a restraining element (14) through a yarn guide means (4) arranged in prolongation of the axis (122) of the accumulator roller. The restraining element (14) is of radially outwardly open construction and is formed by a yarn restraining ring drivable relative to the accumulator roller (10). The ring includes a radially outwardly open yarn restrainer (141). The yarn guide means (4) consists of two mutually separable yarn guide components (40, 41) and is constructed as a yarn conveyor which deflects the yarn (31) out of a prescribed yarn path (32) into a yarn path intersecting the path of the revolving yarn restrainer (141).

Abstract: The housing (1) of a opening device for an open-end spinning apparatus is lined by a thin-walled insert (3) which exhibits a perforation for the discharge of material (dirt, fibers) from the interior space of the housing (1). For the protection of the edge (310) bounding this perforation downstream relative to the fiber flow, an edge protector (4) is provided which is slidable onto the edge (310) engaging over the latter. For sliding the edge protector (4) onto the edge (310) to be protected, or for stripping it therefrom, a combined insertion and ejection tool (5) is provided which is introducible into the insert (3) and movable with a contact surface (51) along the peripheral wall (33) of the insert (3). The combined insertion and ejection tool (5) has a receiving throat (6) for the temporary reception of the edge protector (4) with a step (60) overhanging the contact surface (51) and in turn exhibiting a stripping edge (67).

Abstract: An open-end spinning rotor located on a rotor shaft (20) having a collar (3). The open-end spinning rotor (1) is pressed against the collar (3) by means of a clamping disk (4). The collar (3) is designed as a second clamping disk (31) which is attached to the rotor shaft (20) in an opposite arrangement to that of the first clamping disk (4).

Abstract: In order to wind a newly joined thread onto a tube newly inserted on a spooling device on an open-end spinning mechanism, the newly joined thread, together with a thread portion containing a leader, is guided away before the start of the bobbin build-up. Thereupon, the thread portion containing the leader is severed from the thread, and subsequently, the thread supplied by the open-end spinning mechanism is transferred to the newly inserted tube. To exchange a full bobbin for a new tube, a thread break is produced, the open-end spinning mechanism is cleaned and the thread is thereupon joined anew. To carry out this process, there are, on an open-end spinning mechanism, provided with a thread-joining device and a spooling device, a thread-suction device (4), a thread feeder (42) transferring the thread (35) supplied to the thread-suction device (4) to a newly inserted tube, and a thread-severing device (41) assigned to the thread-suction device (4).

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: A sliding gate valve includes a valve body (1) and a valve plate (5) which can slide transversely to the direction (108) of flow of the medium and exhibits narrow slot passages (50, 51) running transversely to the direction of the stroke, and which cooperates with a counterpart (4). The counterpart (4) is composed of a valve seat (40) which, like valve plate (5), consists completely of ceramic, and further includes a metallic supporting part (41) which supports the valve seat (40) across the whole area of the side of it opposite valve plate (5). The counterpart (4) includes passages which may be opened or closed by the valve plate (5) and are formed by slotted passages (400, 410; 401, 411; 402, 412)in alignment in the valve seat (4) and in supporting part (41). The valve plate (5) is connected via a screw connection (6, 61, 610; 8, 61, 615) to a driving unit which includes a part (33) acted upon by a control medium. This driving unit is, in turn, connected via a connecting part (2) to the valve body (1).

Abstract: A suction duct for textile machines such as bale-openers which is provided for receiving fibers removed from a bale through a flexible tube. The flexible tube 30 is moved with a carriage 21 over a row of bales when removing fibers therefrom. The fibers passing through the flexible tube 30 are deposited into the suction duct 1 which has a longitudinally extending opening 10 provided in the top thereof. In order to maintain the suction duct closed except for the opening 10' communicating with the flexible tube 30, a flexible cover-strip 4 is moved with the connection-opening 3. The remote end of the cover-strip 4 is fixed.

Abstract: On a spinning machine, especially an open-end spinning machine, which has a plurality of spinning units (10) each with a plurality of elements (4, 41) to be controlled electrically, there is a maintenance device (2) which is movable along the machine and which can be coupled electrically to the elements (4, 41) to be controlled of the particular spinning unit (10) located in its working range. One bus line (51, 52) is provided for identical elements (4, 41) to be controlled electrically of each of a plurality of spinning units (10). Furthermore, each spinning unit (10) has a switching device (55) which can be actuated as a function of the posiiton of the maintenance device (2) and which connects the various elements (4, 41) to be controlled electrically of a spinning unit (10) to the bus lines (51, 52) which are assigned to them and to which the maintenance device (2) is constantly connected.

Abstract: In a pneumatic gripper for bobbin changer devices with an elastically deformable collar in the gripper housing, the gripper housing (2) and the collar (3) are of bell-shaped construction. The collar (3) is inserted into the gripper housing (2). The collar (3) overlaps the edge (20) of the gripper housing (2) and is pressed airtightly against the edge (20) by means of a screw collar ring (4). The gripper can be produced with a simple construction and cheaply and retains the cop with directional stability.

Abstract: The present invention relates to a device for forming a reserve winding on a bobbin tube outside the traversing path of a main thread guide which moves to and fro along the bobbin tube wherein a thread holding device is disposed in the vicinity of a thread path between a thread delivery point and the bobbin tube. The device includes an auxiliary thread guide arranged in the region of the reserve winding between the bobbin tube and the thread holding device having two deflecting guides between which the thread can be guided parallel to the surface of the bobbin tube whereby a thread catching projection disposed on the bobbin tube and rotating therewith projects between the two deflecting guides for catching the thread, and a movable thread guide arranged on the side of the auxiliary guide away from the bobbin for transferring the thread to the main traversing thread guide after the reserve is formed.

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).