Abstract: Core/shell particles comprising a core comprising an elastomer having a T.sub.G value of <0.degree. C., onto which a shell of a crosslinked copolymer is grafted, where the proportion of the crosslinking component in the copolymer of the shell is from greater than 5 to 90% by weight, based on the total amount of the comonomers of the shell copolymer, are suitable as toughening agents for epoxy resins, with which they have good compatibility.

Abstract: An apparatus is provided for the transfer of a thread (1) carried in a low pressure air stream being delivered to a rotating spool (7) with which a capture apparatus (4) runs in synchronism for the pick-up of the thread (1) which is set before it by a thread dispensing unit for this purpose. This thread dispensing unit exhibits two thread guides (31, 30) which hold the thread (1) at right angles to the travel path of the capture apparatus (4). Respectively, the first thread guide (31) forms a hold-back element which acts to restrain the thread (1) during the formation of a reserve winding in the spool border and to release the thread (1) for the formation of the normal winding. This first thread guide (31) is governed by a controllable drive (33), with the help of which, the open side of a thread guide groove (312) of this first thread guide (31) is pivotable out of a thread restraining position (S.sub.1) into a thread release position (S.sub.2).

Abstract: A method for producing a yarn reserve, in particular on a cross wound package carried on a bobbin former which has an end which projects beyond the package. A groove is provided in the end portion for securing the yarn as the yarn is wrapped therearound before being brought back over the surface of the package for producing a yarn end reserve.

Abstract: A method and apparatus for producing a yarn reserve, in particular on a cross wound package carried on a former which has an end which projects beyond the package. A groove is provided in the end portion for securing the yarn as the yarn is wrapped therearound before being brought back over the surface of the package for producing a yarn end reserve.

Abstract: A method of stopping a spool which is driven by a continuously rotating spool roller on an open-end spinning machine. The spool is lifted off the spool roller and a braking roller is placed on the peripheral surface of the spool, after which the braking roller is braked to a stop. In this case, the roller is driven substantially at the peripheral speed of the spool roller before being placed on the spool. In order to perform the method, the braking roller has associated with it a braking device which is connected for control purposes to a spool-changing device. The braking device is constructed as a direct-current machine with a resetter.

Abstract: In order to form parallel windings in the longitudinal end region of the empty tube, a drive roller, which is driven at a peripheral speed adapted to the constant thread withdrawal speed provided for the subsequent formation of the crosswinding, is placed onto the peripheral surface of the empty tube, which has been lifted from the winding cylinder, and the thread, which is delivered at a constant speed, is passed to the then driven empty tube. After formation of the reserve winding, the empty tube is lowered onto the winding cylinder. The thread is displaced towards the middle of the bobbin and, by way of adaptation to the shortening of the thread run occasioned thereby and to a change in diameter possibly then brought into effect, the peripheral speed of the drive roller is altered to maintain a constant thread wind-on tension. The thread is passed to the cross-winding device, and the drive roller is lifted from the empty tube.

Abstract: A process and device is provided to handle the yarn after piecing or bobbin replacement where conical bobbins are used. According to the process and with the apparatus, the yarn is transferred to the yarn guide in such a manner that the yarn is first guided in direction of the smaller diameter of the bobbin or former before the winding of the yarn over the entire bobbin width of the bobbin takes place.

Abstract: A process for the piecing of a yarn end on a open-end spinning machine. The yarn is backfed a first time from a cross-wound package, the backfeeding is interrupted and the yarn is clamped at a predetermined distance from the package and the free end is cut. The backfeeding is then resumed for a predetermined period of time and the yarn is temporarily stored between the clamping point and the package. The stored yarn is then wound onto the package in a plurality of parallel windings upon a predetermined generating line. The yarn clamp is released to backfeed the yarn remaining in the temporary storage device and to stretch or tension the yarn between the package and the backfeeding means. The yarn is reclamped and the excess yarn is cut to a predetermined length. The yarn is backfed to the spinning rotor of the open-end spinning machine to combine with fibers in the rotor to piece up the yarn, which is then drawn off the rotor and wound onto the package.

Abstract: The instant invention relates to a travelling mechanism of automatic service carriages for spinning or twisting machines. The invention includes a travelling mechanism having a supporting wheel mounted in a pivot bearing, the guiding axis of the pivot bearing coinciding with the central vertical axis of the supporting wheel. The pivot bearing is connected via a connecting link to a swivel bearing installed on the travelling gear. The connecting link is arrested on either side by a fixed stop and a swivelling latch.

Abstract: A device and process for piecing yarn on an open-end spinning device where a yarn is fed back either from the winding bobbin on which it had been wound previously, during the spinning process, or from a special piecing bobbin via a common back-feeding path to the spinning device. The piecing yarn, drawn off from the piecing bobbin, as well as the yarn drawn off from the winding bobbin is first subjected to the effect of a controllable draw-off action at the beginning of this common back-feeding path upon completion of the piecing process. The yarn, which continues to be delivered by the spinning device, is subjected to the effect of normal spinning draw-off only upon reaching the full draw-off speed and is transferred to an empty tube located in the winding device, whereby the excess yarn segment with the piecing joint is severed and removed when replacing the winding bobbin.

Abstract: The tubes to be conveyed to the pirn heads are stacked up within each other in columnar fashion, are held in readiness at a supply location and are separated to be taken away. The separated tube is brought into a conveying position and, while maintaining this conveying position, is transferred to a conveyor extending across all of the pirn heads of the machine. For this purpose a tube-conveying device is installed between a tube magazine (4) and a conveyor belt (2) extending alongside all of the pirn heads, containing means (51) to position the tube (50) into the conveying position and means (71, 6, 8) for the transfer of the tube (5) in its conveying position to the conveyor belt (2).

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: 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: 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: To provide for reliable starting of lamps under cold or warm condition, by pulse superimposition circuitry, an auxiliary capacitor (11) and a serially connected damping resistor (12) are integrated in the starter or igniter circuit. The series circuit of the auxiliary capacitor (11) and the damping resistor (12) forms, together with a choke or ballast (2) a series oscillatory circuit which is directly connected to act on the primary (8) of the pulse transformer (4, 13) and increases the lamp supply voltage during ignition. A semiconductor switching element (9), such as a four-layer diode, disconnects the oscillatory circuit after ignition, also interrupting the supply for the series oscillatory circuit, so that the lamp, after ignition, will receive only normal network supply power.

Abstract: The method and apparatus for removing irregularities in a thread being produced on a machine as the thread is traveling to a takeup device. A thread reserve having a suction applied thereto causing a loop to be formed therein which contains said irregularity. An additional pair of loops are formed in said thread, one above and one below the thread reserve. The loop formed in the end of the thread reserve is severed from the thread and the two remaining loops are inserted into a thread joining device. A thread suction extractor associated with the thread joining device pulls the end portions of the pair of loops taut permitting the joining operation to take place and, after joining of the thread, removing the separated ends.The thread reserve is provided with mechanism for maintaining the loop of thread extending therein separated and for severing and removing the portion of the loop containing the irregularity from the thread.

Abstract: The present invention relates to a controllable thread extractor with an air passage connected to a vacuum source which includes a shaft passageway perpendicular to the air passage dividing the air passage into two sections, a ball is received in the shaft and means for actuating the ball to selectively open and close the air passage.