Abstract: A spinner is disclosed having at least one drawing roller arrangement, the bottom rollers of which are driven by at least one electric motor. For the purpose of identifying specific malfunctions and setting errors, a monitor is allocated to the electric motor, or to at least one of the electric motors, which monitors its power input and/or torque.

Abstract: A drafting mechanism for spinning machines for drafting a staple fiber web, a staple fiber sliver or a staple fiber slubbing has at least an input roller pair, two intermediate roller pairs, and an output roller pair each having a lower roller and a pressure roller, a first group of support elements arranged to receive the lower rollers at their both ends and a second group of support elements arranged to receive the pressure rollers at their both ends, and the support elements receiving the lower rollers and/or the support elements receiving the pressure rollers are connectable to each other on both sides of the rollers by respective connecting elements.

Abstract: Spinning machine in which the upper rollers of the drafting units are arranged at pressure arm assemblies, whereby each pressure arm assembly has a main arm and an operating lever which is positionally arranged above the main arm and radially movable. To each work location of the machine are assigned signal lights for indicating disruptions at the work location. For optimum visibility from distant locations, the indicator lights are provided at the operating levers.

Abstract: A method and apparatus for straightening fibres in a sliver comprises subjecting the sliver to sliding frictional contact with a foraminous surface through which an airflow passes, the sliding contact having the effect of both straightening the fibres in the sliver to orientate them, and straightening the hooked ends of any fibres in the sliver, and the influence of the airflow serving to remove dust and/or trash from the sliver.

Abstract: A drafting roller arrangement for spinning machines is disclosed having at least three pairs of rollers forming successive drafting zones in the conveying direction of the sliver and having a sliver stopping device assigned to the first pair of rollers that can be triggered by a disturbance. In front of the last drafting zone, a sliver condenser having guide surfaces narrowingly tapering in the conveying direction of the sliver is arranged. The sliver condenser is provided with a threading slot extending in the conveying direction of the sliver and is held by means of a holding device in such a way that it can be moved out of the drafting zone transversely to the conveying direction toward the side facing away from the threading slot. This arrangement accommodates restarting of the drafting arrangement without the sliver condenser interfering with the sliver supplied to the last drafting zone.

Abstract: An apparatus used in combination with a yarn spinner has an upstream gripper roller assembly including at least an upstream roller pair gripping the yarn to be stretched, a downstream gripper roller assembly including at least a downstream roller pair spaced from the upstream pair and also gripping the yarn, and respective variable-speed drives connected to the upstream and downstream pairs for rotating same at respective slow downstream and fast upstream speeds and thereby passing the yarn from the downstream to the upstream pair while stretching it. Respective upstream and downstream sensors juxtaposed with the yarn adjacent the upstream and downstream roller pairs measure the yarn size and respective upstream and downstream controllers connected to the respective sensors and drives rotate the respective roller pairs at speeds dependent on the respective detected yarn sizes.

Abstract: The drawing apparatus for textile fibre webs comprises a series of pairs of olls, the peripheral velocity of the rolls of each pair being greater than the peripheral velocity of the preceding pair in the direction of advance of the web.Each roll has a resilient covering constituted by highly flexible steel wires that extend substantially radially. A smaller-diameter smooth roller is interposed between each pair of covered rolls and the following pair, the smaller diameter roller having a peripheral velocity equal to that of the following pair. The disposition of the smooth rollers is such as to impart a sinuous course to the web and keep the web in engagement with the metal wires of the covered rolls over substantial arcs. The drawing apparatus achieves higher drawing ratios with a good quality of the drawn web using a smaller number of pairs of rolls.

Abstract: Fiber slivers must be condensed during the course of a spinning process or their mass must be determined. For this purpose there are employed so-called grooved pairs of rollers, that is to say, profiled rolls which define a sliver throughput groove which is limited or confined at both sides. The sliver is guided through a feed or delivery funnel up to the throughput groove. The danger thus exists that individual fibers can jam between the side surfaces or faces of the rollers which form the lateral boundaries of the groove. This danger is eliminated with the invention in that the fiber outlet opening of the feed funnel is located within the region of a wedge-shaped gap which is bounded by an overlapping zone of the side surfaces or faces of the rollers.

Abstract: A device for interrupting feed of a roving on a drawing frame, having a feed roller pair, e.g., a powered bottom roller and a top roller tensioned against the bottom roller by springs, includes a clamp for lifting the top roller away from the bottom roller and clamping the roving against the circumference of the top roller. The clamp is disposed on a lever pivotable about an axis parallel to the axes of the feed roller pair and is shiftable with respect to a clamping edge, in the feed direction of the roving, toward the circumference of the top roller. The clamp includes a tongue which initially engages in the nip between the rollers and a portion having a toothed profile which cooperates with the clamping edge by engaging the roving.

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: An apparatus used in combination with a yarn spinner has an upstream gripper roller assembly including at least an upstream roller pair gripping the yarn to be stretched, a downstream gripper roller assembly including at least a downstream roller pair spaced from the upstream pair and also gripping the yarn, and respective variable-speed drives connected to the upstream and downstream pairs for rotating same at respective slow downstream and fast upstream speeds and thereby passing the yarn from the downstream to the upstream pair while stretching it. Respective upstream and downstream sensors juxtaposed with the yarn adjacent the upstream and downstream roller pairs measure the yarn size and respective upstream and downstream controllers connected to the respective sensors and drives rotate the respective roller pairs at speeds dependent on the respective detected yarn sizes.

Abstract: A novel fiber drafting system is disclosed, according to which fibers of sliver supplied continuously are passed through a first pair of rotatable cooperating rollers while being pressed and compacted into a reduced section by and between a space formed by a groove and a projection formed respectively in and on the circumferential peripheries of the rollers of said first pair. The sliver thus compacted is then transferred to and held by and between a second pair of rollers rotated at a higher peripheral speed than the first pair of rollers, whereby the fibers of sliver are drafted successively between the two pairs of rollers without use of conventional aprons for guiding and supporting the fibers in the drafting zone.

Abstract: A fiber strand delivered to a draft zone between a pair of back rollers and a pair of front rollers is introduced into a passage formed through a fiber strand guide device. On the way of the passage, floating fibers contained in the fiber strand are controlled by means of a fluid stream jetted to a back surface of the fiber strand to press the fiber strand onto an inner wall of the passage as well as forward it towards the front rollers. A pressing plate may be cooperatively utilized with the fluid stream. Accordingly regular drafting is attained.

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 drawing frame has an electric driving motor (M) and a main shaft (H), which is drivingly connected to several driven rollers (W1-W4, W1'-W4') in the two draw heads (11) of the drawing frame. Between the motor (M) and the main shaft (H) are arranged a belt adjusting gear mechanism (V and HO) and a clutch (K). The transmission ratio of the adjusting gear (V and HO) is automatically gradually reduced from a maximum value to the operating value, so that the main shaft (H) is smoothly accelerated.Cut-off devices are provided for automatically stopping the frame when a disturbance of any kind occurs. The cut-off devices switch off the electric motor (M), release the clutch (K) and actuate a brake (B) which acts upon the main shaft (H), and also an adjusting member of an adjustable disc (V) of the belt-adjusting gear (V and HO). The brake (B) can be relatively small, as it does not have to decelerate the uncoupled motor (M).

Abstract: A drawing frame with a drawing region or with two independent drawing regions includes, as a whole, four or more so-called drawing and control rollers. These latter all comprise pressure rollers with barrel rubbers. The control roller situated immediately upstream of the draw-off or "total" drawing roller is arranged in such a position that its periphery is separated from that of the drawing roller by a narrow gap. The ratios between the diameters and the speeds of rotation of these rollers is selected in such a way that the peripheral velocity of the "total" drawing roller is significantly greater than the peripheral velocity of the adjacent control roller. Consequently, an upwardly directed flow of air is created which removes the floating fibres which would otherwise tend to form windings or so-called "rolls".

Abstract: A high draft apparatus for use in the worsted spinning process. At the gilling or bobinoir step of the worsted spinning process, a porcupine roller and a middle roller are disposed between a front roller and a back roller to prevent an occurrence of unevenness and to obtain a uniform sliver.

Abstract: The combing and drawing frame having a comber cylinder provided with sawtooth clothing, which is surrounded over part of its circumference by a fixed comber bed with sawtooth clothing and which is mounted in front of at least one pair of drawing rolls and mounted behind at least one pair of drawing rolls, comprises a feed device or guide for the sliver which is to be processed, this feed device being capable of being adapted to fit closely against the comber cylinder so as to improve the quality of the sliver which is processed. The feed device may be in the form of a lap plate or a feed roll, each being associated with an upper feed roll.

Abstract: A control roll is provided for use in the processing of staple fibers and comprises a plurality of radially and circumferentially spaced projections on the surface of a roll. The control roll is placed in the path of a strand of fibers and the individual fibers in the strand are physically oriented into parallel relation with one another and maintained in that relation until the fibers are processed as by drawing and twisting.

Abstract: The present invention concerns a method for processing a fiber sliver in a drafting arrangement, and a drafting arrangement for implementing the method. The objective for a drafting arrangement, which can be adapted to a wide range of staple lengths, to draft a fiber sliver at high speeds, has led to the following features of the invention:(a) The fiber sliver is deflected simultaneously in the drafting process systematically in such a manner that, the fiber sliver can be inserted into the subsequently arranged funnel and the subsequently arranged pair of calender rolls without further deflection.(b) All bottom rolls are fixedly arranged.(c) The first pressure rolls limiting the pre-drafting zone and the main drafting zone, respectively, are arranged to be shiftable along an arc about the rotational axis of the corresponding bottom roll in such a manner that the drafting zones are adaptable to the fiber length.

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: The present invention concerns an apparatus for severing a fibre layer (3) composed of mutually slidable staple fibres, and containing two driven pairs of rolls (9/10; 11/12) forming two nip lines for the fibre layer (3) guided therebetween. Severing is achieved in that the two pairs of rolls (9/10; 11/12) are kinematically coupled using a flexible power transmitting element (19) in such a manner that by moving a roll tandem (26) contained in the path of movement of the power transmitting element (19) one pair of rolls (11/12) is rotated relative to the other one (9/10). Owing to this relative rotation of the pairs of rolls the fibre layer clamped between the nip lines is severed. This apparatus presents the advantage that its design is simple and reliable and that, in particular, no clutch is required.

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: An apparatus for drafting and parallelizing strands of fiber comprising three side-by-side rolls nested in three side-by-side troughs which conform to and are adjacent the bottoms of the three rolls. The rolls are rotated in the same direction at sequentially greater speeds. The first two rolls include fiber-combing teeth, and the third roll is composed of a smooth, rubber-like surface. The fibers pass sequentially around the bottoms of the three rolls through a very narrow gap between the rolls and troughs to emerge in a parallelized, drafted condition. The unit may be incorporated into a no-twist yarn system as the sole mechanism for drafting and parallelizing the fiber, to form no-twist yarn in a continuous manner; or be used in place of conventional drafting system.

Abstract: A pressure roll of a drafting device comprises a cylindrical casing and a sleeve of an elastic material having flanges. The sleeve is mounted in a spaced relationship to the casing, the flanges of the sleeve are bent toward one another and each flange has two portions of which one portion extends at an angle to the generatrix of the cylindrical casing and the other portion extends in parallel with the generatrix of the cylindrical casing and is secured to the cylindrical casing so that a satisfactory elasticity of the roll along the entire length of its working surface is ensured.

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: The invention contemplates a method for separating fibers fed in the form of fibrous material, wherein the material is pinched in the cross-section in such a manner that the pinching action is applied to fibers spaced from one another at a certain distance. Simultaneously, the velocity of fibrous material is substantially increased so that individual fibers are pulled out. An apparatus for carrying out the method comprises an outlet pair of rolls having an appropriately profiled cylindrical roll.

Abstract: A nonwoven fabric is produced by forming a batt of fibers which are oriented primarily transverse relative to the direction of movement of the batt, stretching said batt longitudinally relative to the direction of movement of the batt, and needling the stretched batt. Also apparatus suitable for the production of the novel fabric is disclosed.

Abstract: A machine for blending, matting, shortening or sizing natural or artificial fibers, in which the work is performed by groups or trains of three rollers. A first working stage has a single head delivering two slivers and in which the twin bearing rollers are of large size, the two slivers emerging from the single head being fed axially or perpendicularly by directional and juxtaposing members towards a second working stage in a single lap, the width of which is at least 50% less than the width of an individual sliver. The second working stage has a reducing head which comprises a plurality of trains with twin lower retaining and traction rollers, respectively, mounted overhung on frames, adjustably spaced from one another.

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.

Abstract: A series of roller pairs in the drafting zone of sliver drafting apparatus have toothed or needlelike projections. The projections are spaced circumferentially and axially of the rollers so that projections of cooperating rollers either within a pair or between rollers of adjacent pairs are periodically interdigitated, as seen axially of the rollers, in spaced relationship as the rollers rotate at constant angular velocity. The rollers carry toothed wheels engageable for positive drive without backlash by a toothed belt. The upper rollers of the pairs are driven by a common endless loop belt and the lower rollers by a second belt. Each belt passes over a spring-loaded jockey roller which tensions the belt and which can be moved against the spring force in response to overloading tension on the belt caused by retardation of roller rotation in response to excessive fibres between a roller pair. Such movement of the jockey roller actuates a limit switch to shut off the belt drive motor.

Abstract: Herein disclosed is an improved tooth structure adapted for those paired control rollers of a rotary drafting apparatus, which are positioned adjacent to the paired front or drafting rollers of the drafting apparatus. The tooth structure has each of its teeth so contoured that the angle contained in the back or trailing side between the front or leading-side face of the tooth and the tangent, which is taken in the backward direction from the leading edge of the particular tooth to the dedendum circle of the control roller where the tooth is formed, is preset equal to or larger than a right angle.

Abstract: The invention relates to devices for supplying fibers to a unit for spinning loose or free fibers. Such a device according to the invention comprises a feeding device including means for holding back a sliver of fibers and a fiber-separating device disposed in a hollow enclosure and constituted by a rotary drum, the surface of which is made up by elements of narrow fiber-separating ridges which each extend in a circumferential direction in a plane perpendicular to the drum axis over only a part of the drum periphery; two of said elements successive in the axial direction are angularly staggered while narrow and deep grooves separate in the axial direction at least a part of said ridge elements from one another; the invention is generally applicable to feeding devices of spinning units of free or loosened fibers of all kinds.

Abstract: A rotary drafting apparatus for use in a spinning machine, which apparatus comprises a pair of back rollers coactively rotatable for guiding therethrough sliver to be drafted, and a pair of front rollers coactively rotatable for drafting the guided sliver. A sliver control mechanism is interposed between the back rollers and the front rollers and includes plural pairs of control rollers, which are rotatably supported through their respective support shafts and which are formed with numerous needles, so that the guided sliver may be combed when it is passed therethrough. A rotation regulating mechanism is also incorporated in the drafting apparatus so as to regulate rotation of that pair of the control rollers, which is positioned closer to the front rollers, substantially at a predetermined constant angular velocity in a manner to be free from being affected by any possible variation in the drafting force of the front rollers, thereby minimizing unevenness in thickness of the sliver obtainable.

Abstract: An unpredictable random distribution of segments of supplemental strands of fiber are produced in a base strand by pulling segments from the supplemental strands and adding them to the base strand. The segments are pulled from free extents of the supplemental strands that have a free length longer than the length of the fibers of the supplemental strands, and the supplemental strands advance slower than the base strand, with the result that the size and occurrence of the pulled segments in the base strand are unpredictably random. Preferably, a draw frame is used, to which is added a feed unit having a pair of rotating feed rolls for feeding the supplemental strands to the next-to-last pair of drafting rolls that have a surface speed greater than the feed rolls and are spaced therefrom a distance greater than the length of fibers in the supplemental strands.

Abstract: This invention relates to a staple draft device comprising a pair of feed rollers and a pair of drawing-off rollers, said pairs determining therebetween the course of a staple lap to be drawn off, there being at one side of said course a feed roller with needle-like projections and a control roller also with such projections, and at the other side of said course a supplementary needled-surface roller which co-operates solely with said needled-surface feed roller, and a single levelling-down roller which is smooth, co-operates solely with said needled-surface control roller, and is preferably positively driven at an angular speed such that the peripheral speeds of said levelling-down and control rollers with needle-like projections are equal.