Abstract: An apron for a draft apparatus being suitable for use with a pneumatic high speed spinning frame. The apron includes a front side rubber layer, a reverse side rubber layer adhered to the front side rubber layer and core cords interposed between the two rubber layers. The peripheral borders of the apron have such a construction that one of said rubber layers is retracted from the other of the rubber layers.

Abstract: The present invention provides a draft roll arrangement in a spinning frame in which the apron bottom roll is longitudinally divided into two sections at a location along its length selected to be within a range for which torsion of the apron bottom roll does not pose a problem in spinning, and in which the respective bottom rolls are operatively connected to one another in such a manner that one of the ends of the back and front bottom rolls and one apron bottom roll section are connected to a driving source and the drive for the other apron bottom roll section is derived through the back and front bottom rolls. In a preferred embodiment, the respective apron bottom roll sections are associated with rotational angle sensors whose output rotational angle signals are supplied to a control unit. When the difference in the rotational angle has exceeded a preset value, an output signal indicating such state is issued from the control unit.

Abstract: An apron for a draft apparatus being suitable for use with a pneumatic high speed spinning frame. The apron includes a front side rubber layer, a reverse side rubber layer adhered to the front side rubber layer and core cords interposed between the two rubber layers. A ratio of thickness between the front side rubber layer and the reverse side rubber layer is set to a value within a range from 3:7 to 1:9.

Abstract: Draft apparatus for use with a pneumatic high speed spinning frame. At least one pair of sliver compressing member are disposed on the sliver path. One of the sliver compressing members has a circumferential recessed groove for receiving the sliver and the other sliver compressing members has a circumferential rib adapted to be fitted into the recessed groove.

Abstract: A draft device for a spinning machine comprises a plurality of pairs of a top roller and a bottom roller, a draft cradle for supporting shafts of the top roller and a belt tenser. Top roller shafts are supported by a top roller support which is rotatably supported on a frame at one end thereof and side plates for fitting the top roller shafts therein, and spring members for pressing the roller shafts are disposed within the top roller support. A tenser of the belt tenser has an engaging portion wherein the top roller shaft is loosely fitted.

Abstract: The drafting mechanism comprises an entry roller pair, an intermediate roller pair and a delivery roller pair. An apron hair is mounted such that one of the two aprons projects deeper than the other into the converging space of the pair of delivery rollers, so that the fiber sliver is still diverted, and is thus guided, after the exit or delivery opening of the aprons, on the apron projecting more deeply into the converging space. Further, both aprons are guided sufficiently close to their related delivery roller such that the aprons do not contact these rollers but leave open a minimal air gap, so that only a minimal quantity of the circulating air produced by the rotating delivery rollers can penetrate into the converging space.

Abstract: A bottom tenser utilized for a drafting means of a spinning frame, especially for fasciated yarn spinning, in which a fiber bundle is attenuated at a high speed exceeding 100 m/min. The bottom tenser as well as a bottom roller corresponding to the tenser is provided with a free end through which an apron is easily removable from and mountable on the tenser and the roller. The tenser may be constituted by a body and at least a guide wall movable relative to the body. The guide wall prevents lateral movement of the apron in its operative position and, in turn, is displaced or removed from the body in its non-operative position so as not to obstruct an apron exchanging operation.

Abstract: A textile fiber drafting apparatus is disclosed, according to which the drafting bottom rollers in each line along the spinning units of a spinning frame are arranged in such a way that each two adjacently juxtaposed bottom rollers make a single block for each two spinning units, so that each bottom roller has an open, free end through which an apron may be replaced with a new one or fibers entangled on the roller may be removed with extreme ease. Between each such two spinning units is provided an arrangement for driving the bottom rollers thus disposed, including driving and driven mechanisms.

Abstract: A drawing frame for a spinning machine is provided with a blocking mechanism movable into a position between the upper and the lower feed rollers in the event of yarn breakage, to lift the roving from contact with the driven roller. A roving holder facilitating the holding of the tuft end of the roving between the drawing and outlet rollers is provided. This latter apparatus is coupled to the means for actuating the blocking mechanism for synchronous operation and is provided downstream of the inlet roller. It comprises a table extending beneath the roving and a rotatable shaped arm above the roving which arm is movable by the switching mechanism to simultaneously hold the front end of the roving.

Abstract: A drawing frame for a spinning machine is provided with a blocking mechanism movable into a position between the upper and the lower feed rollers, in the event of yarn breakage, to lift the roving from contact with the driven roller. The blocking mechanism holds the roving. A roving holder is coupled to the means for actuating the blocking mechanism for synchronous operation and is provided downstream of the inlet roller. It comprises a table extending beneath the roving and a rotatable shaped arm above the roving which arm is movable by the switching mechanism to simultaneously hold the front end of the roving. The table is provided with a guide lug at its free end extending at an upward angle relative to the rotatable arm and the arm is covered with an inclined member having a slope running toward the guide lug.

Abstract: A spinning frame of the type having a main drafting zone through which two fiber bands move in spaced parallel relation for subsequent twisting into a single yarn is provided with a first pair of rollers located at the entrance to the main drafting zone, a second pair of rollers located at the exit of the main drafting zone, a pair of endless leather tapes extending about a roller in each of the first and second pair of rollers, and a third pair of rollers for delivering two fiber bands from the main drafting zone to a suitable twisting device.

Abstract: A drafting device in a spinning machine including a cylindrical sliver guide and an adjusting guide for reshaping and controlling the sliver, and a traverse mechanism for an apron supported on the middle roller. The sliver guide is disposed in front of the back rollers and the adjusting guide is arranged between the back rollers and the middle rollers.

Abstract: A method and apparatus for transmitting a driving power in a drafting device of a spinning frame. In the drafting device comprising a pair of back rollers, middle rollers and front rollers arranged in order, the driving power for the middle rollers is transmitted through a transmission passage different from a transmission passage for transmitting the driving power for the back rollers and front rollers.

Abstract: A drive system for a drawframe for a rove drawing process in which the drawframe includes at least one pair of feed rollers, at least one pair of sleeves, at least one pair of drawing rollers, and at least one swinging arm on which one feed roller, one sleeve and one drawing roller of each pair is supported, the swinging arm being displaceable between an inoperative position and an operative position where the pair of feed rollers, pair of sleeves and pair of drawing rollers are engaged under pressure for rove drawing. The drive system includes a drive shaft and at least one displaceable friction clutch roller which is displaceable between an operative position to engage both the drive shaft and one of the feed rollers for transmitting drive from the drive shaft to the feed roller, and an inoperative position where it is disengaged from the feed roller, the friction clutch roller being displaceable into its operative position to allow progressive engagement of the drawframe at start up.

Abstract: A drive for the rolls defining a main drafting zone of drafting arrangements of long spinning machines, wherein in order to prevent drafting defects caused by distortion movement of the rolls, the latter are driven from one end by a first gear arrangement and from the other end are interconnected rigidly drivewise or slippage-free, respectively, during the standstill of the spinning machine via a second gear arrangement and via a freewheel clutch.

Abstract: A method of improving the outer portion of a rotatable textile fiber processing component is provided, the method comprising the steps of making the outer portion substantially of butadiene copolymer rubber, subjecting the outer portion to the action of a halogen to define the desired properties of minimum compression set for the outer portion and a working surface which has a comparatively low coefficient of friction, mounting the component on a rotatable support means of a textile processing equipment, then operating the equipment whereby the outer portion of the component is worked, and applying additional halogen on the outer portion with the component in a stationary position in its working environment in the equipment while supported on the rotatable support means therefor after the outer portion has been worn from the working thereof whereby the outer portion is rejuvenated so that further operation of the equipment can take place with the component again having the desired properties.

Abstract: Device for aligning and attenuating soft or brittle fiber mats employing a rotating vacuum roller for gently grasping the fiber mats under sufficient compressive force to hold the same without breaking or otherwise damaging the fiber mats.

Abstract: A method for converting a multifilament bundle of a synthetic material into a sliver and an apparatus for effecting the method. The apparatus comprises: a feed roller device for feeding the bundle; a draft roller device consisting of a pair of draft rollers, the peripheral speed of which draft roller device is higher than that of the feed roller device, for stretch breaking the filaments in the bundle between the feed roller device and the draft roller device; and an apron belt, belted between one roller of the draft roller device and the intermediate portion of the feed roller device and the draft roller device, which is wound around the other draft roller. The broken filaments are smoothed between the apron belt and the other draft roller so that the evenness of the sliver thickness is improved and the uniformity in quality of the spun yarn obtained from the sliver is also improved.

Abstract: In a drawing frame having a fibre-control system composed by two confrontingly and superposedly mounted closed-lap belts, the improvement consisting in that the upper-belt driving cylinder has a barrel-like sleeve of an elastomeric material of an appropriate hardness mounted thereon, so as to improve the fibre tow control and to adapt said cylinder to the processing requirements of tows or webs of variable bulk. It is preferred that the barrel-like sleeve is thinner at the middle section than at the end sections.

Abstract: A textile drawing machine has interchangeable drawing heads mounted between the feed rollers and the drawing rollers, to enable it to treat different types of textile fibres. The heads are readily replaceable in a frame of the machine and have support and drive members engaging support and drive members on the frame.