Abstract: A method of needling a web comprises the steps of continuously supplying the web to needles, reciprocating the needles to stitch the web supplied to the needles and to release the stitched web, moving the released stitched web step by step by subjecting the released stitched web to a weight load, and then continuously withdrawing the released stitched web. An apparatus for carrying out this method comprises a dancing roller arranged to exert the weight load between a stitch base and means for continuously withdrawing the stitched web.

Abstract: A device for needling a web (9), comprising at least one needle board (2) reciprocatingly movable in stitching direction, a stitch base (6) opposite the needle board (2) and a stripper (10) disposed between the stitch base (6) and the needle board (2), which stripper has through holes (11) for the needles (3) of the needle board (2). To create advantageous constructional conditions it is proposed that the stripper (10) should define a compressed-air space (13), which is disposed subsequent to the stripper (10) on the side opposite the stitch base (6) and can be connected with a compressed-air source (16).

Abstract: A device for needling a prebonded web (1), comprises at least one needle board (3) reciprocatingly movable in a stitching direction, a stitch base (2) between a feed roller (6) and a discharge roller (7), which stitch base is located directly opposite the needle board (3) and forms a web guide that is convex in a direction of web movement. The stitch base (2) consists of blades (9) extending transversely to the direction of web movement and having end faces (10) defining a continuously curved enveloping surface. The end faces (10) constituting a web support, and between which blades there engage at least two needle rows extending tranversely to the direction of web movement engage between adjacent blades during their reciprocation.

Abstract: A device for needling a prebonded web (1), comprises at least one needle board (3) reciprocatingly movable in a needling direction, and a web support (2) disposed opposite the needle board (3) between a feed roller (7) and a discharge roller (8). To avoid a stripper it is proposed that the needle board (3) be disposed directly opposite the web support (2), that the web support be provided with a continuous convex curvature in direction of web movement (6), and that the discharge rate of the discharge roller (8) exceed the feed rate of the feed roller (7).

Abstract: In an apparatus for needling a fibrous web passing through the apparatus in one direction, which comprises a needle board driven back and forth in a needling direction, and a support opposite the needle board and having a surface facing the needle board, the support surface comprises surface sections inclined in different directions with respect to the needling direction transversely to the one direction and further surface sections following the surface sections in the one direction and inclined in opposite directions.

Abstract: A device for dividing a card web comprised of a loose structure of fibers into successive longitudinal sections, comprises an air-permeable conveyor belt having a conveyor strand carrying the card web on one side thereof for conveying the card web in a conveying direction, a suction box arranged on a side of the conveyor strand opposite the one side, the suction box defining a suction slot extending transversely to the conveyor strand and facing the opposite side of the conveyor strand, and a screen arranged to close the suction slot and to open it periodically whereby suction is applied to the card web through the air-permeable conveyor belt and a respective one of the longitudinal sections is separated from the card web by sucking the fibers in alignment with the suction slot out of the card web.

Abstract: An apparatus for needling a fibrous web passing through the apparatus in one direction, which comprises a needle board driven back and forth in a needling direction, needles carried by the needle board and extending in the needling direction, and a stationary support opposite the needle board in the needling direction. The stationary support comprises in the range of the needles two support sections inclined in opposite directions in the one direction and a transitional support section between the two support sections and smoothly merging into the two oppositely inclined support sections.

Abstract: A method of layering a fibrous web in overlapping layers on a draw-off conveyor along a predetermined layering distance comprises the steps of sub-dividing the fibrous web into layer sections corresponding in length to the layering distance, sequentially aspirating the layer sections by suction force against the force of gravity onto a lower strand of a continuously revolving layering conveyor extending over the layering distance and conveying the layers in a conveying direction, subsequently detaching the layer sections from the lower layering conveyor strand conveying the layer sections by interrupting the suction force, and depositing the detached layer sections only in a layering direction of the draw-off conveyor.

Abstract: A drafting unit for a ring spinning device is described for use on a ring spinning device, comprising two delivery rollers (1, 2) defining between them a delivery nip (3) for at least one drawframe-treated roving (4), one of them forming a deflection length (5) with a slot-shaped suction zone (6) for the roving (4) exiting the exit nip (3), which extends between the delivery nip (3) and a pressure roller (7) arranged downstream in the sense of deflection, and having an air nozzle (8) offset sidewards with respect to the suction zone (6) for a blast of air directed towards the delivery roller (1) with a flow component transverse to the suction zone (6) which extends in an arc-shaped path between its feed end and its discharge end with the air nozzle (9) on the inside of the arc.

Abstract: The described apparatus for needling a nonwoven web comprises a slider-crank mechanism, which is connected to a rocker and serves to actuate at least one needle board, which is secured to the rocker, and web-guiding means comprising a web support, which is opposite to the needle board, and a stripper, which extends between the web support and the needle board. To provide a high needle density it is proposed that the needle board is arranged to extend at right angles to the direction of the mean inclination of the penetration paths of the needles of the needle board when the slider-crank mechanism is in a midstroke position in the middle of its stroke.

Abstract: An apparatus is described which serves to needle a nonwoven web and comprises a slider-crank mechanism, which is coupled to a rocker pivoted on a pivotal axis that is perpendicular to the direction of travel of the web, and at least one needle board, which is secured to the rocker and carries needles, each of which comprises a shank and a working portion. To ensure a satisfactory penetration of the needles, the working portion of each of needle is curved in a plane that is perpendicular to the pivotal axis of the rocker at least approximately along an arc of a circle that is centered adjacent to the pivotal axis of the rocker.

Abstract: An apparatus is described which serves to needle a nonwoven web and comprises a slider crank mechanism, which is pivoted to a rocker and serves to actuate at least one needle board, which is secured to the rocker. The apparatus also comprises a web guide consisting of a web support, which is opposite to the needle board, and a stripper, which extends between the web support and the needle board. To permit an influence to be exerted on the result of the needling operation it is proposed that the mean inclination of the paths on which the needles of the needle board penetrate the nonwoven web relative to the direction of travel of the nonwoven web is adjustable.

Abstract: An apparatus for making a nonwoven web comprises a carding drum and a continuously movable, air-permeable collecting surface member, which is arranged to collect the fibers which have been discharged from the carding drum and are entrained by an entraining air stream, through a suction duct, which extends between the carding drum and the collecting surface member. Passages for supplying air to the suction duct are provided throughout a predetermined working width of the drum and disposed adjacent to the duct at leading and trailing boundaries thereof with respect to the direction of rotation of the carding drum.

Abstract: For use with a ring spinning apparatus, a drawing frame is described, which comprises two delivery rollers, which define between them an exit nip for a drawn fibrous roving and one of which defines on its air-permeable peripheral surface a deflecting path for the fibrous roving being delivered and a suction zone, which extends along the deflecting path between the exit nip and a pressure, applying roller, which is peripherally spaced from said nip, and the suction zone comprises two juxtaposed and laterally spaced apart branch suction zones, and a blast nozzle is disposed between said branch suction zones and is operable to direct an air blast against the suction-free area which is disposed between the branch zones, whereby the drawn fibrous roving is divided into two branch rovings. The two branch suction zones merge in the suction zone upstream of the pressure-applying roller into a peripherally extending common suction zone portion.

Abstract: An apparatus for making a yarn comprises two pairs of conveying rollers for defibrating at least one fibrous roving, two juxtaposed, closely spaced twisting drums, which succeed the conveying rollers and define a generally triangular twisting space, to which suction is applied and withdrawing rollers for withdrawing the yarn made from the fibers twisted in the triangular twisting space. To ensure desirable spinning conditions in such an apparatus, it is proposed that the two pairs of conveying rollers, which pairs immediately succeed each other, the conveying rollers of the receiving pair, which are remote from the triangular twisting space, define a clamping nip, form a delivering pair of rollers are nearer to the triangular twisting space and defining a guiding nip of rollers permits a slip relative to the fibers, and delivering pair are arranged to be driven at a higher peripheral velocity than the conveying rollers of the receiving pair but not in excess of the velocity of yarn formation.

Abstract: A ring spinning apparatus, which comprises a rotatably drivable spindle, which is adapted to carry and to be non-rotatably connected to a bobbin, a guide ring, which is coaxial to the axis of the spindle and serves to guide a traveler, which is adapted to revolve on the guide ring and constitutes a yarn guide, and an annular deflecting guide, which surrounds the bobbin and serves to deflect adjacent to the guide ring the yarn which is approaching the traveler. That ring spinning apparatus is characterized in that the projections of that yarn portion which is approaching the traveler from the deflecting guide and that yarn portion which is departing from the traveler in a plane that extends through the axis of the spindle include an angle that is smaller than 90.degree. and the projections of said approaching and departing yarn portions in a plane that is at right angles to the axis of the spindle include an angle that is larger than 90.degree..

Abstract: To make a bulky nonwoven web of low density and high uniformity with an apparatus comprising a toothed opening roller rotatable at a sufficient speed to throw off a stream of fibers centrifugally and deposit them on a revolving air-permeable collecting surface member which has a fiber-receiving portion and a suction box having an opening underneath this portion, a guide roller is spaced vertically from the fiber-receiving portion. The guide roller is rotated in a direction opposite to that of the opening roller and has a leading peripheral surface portion facing the opening roller and projecting into the stream of fibers to deflect a part of the fibers, and a trailing peripheral portion constituting a suction zone facing the fiber-receiving portion. A guide wall in the suction box opening controls the air stream sucked through the fiber-receiving portion in the direction of the movement of the collecting surface member.

Abstract: An apparatus for making a nonwoven web has a carding drum (1), a continuously moving, air-permeable collecting surface member (2) for collecting fibers which fly in an entraining air stream from the carding drum (1), a suction box (4), connected to the collecting surface member (2), and a suction duct (3) extending between the collecting surface member and a peripheral portion of the carding drum (1) which is directly opposite to the collecting surface member (2).

Abstract: In order to produce a needled nonwoven web having an improved surface quality, the needle board (1) of an apparatus for needling a nonwoven web should be provided with needles in a higher needle density. To that end the needles (2) of the needle board (1) are arranged in groups having a higher needle density and a perforated plate (5) of the stripper (4) and a perforated plate of the backing member (3) are provided in association with each group of needles with a common receiving hole (7). The needles (2) of each group are arranged in a longitudinal row generally extending in the direction of travel of the nonwoven web and are transversely offset from each other.

Abstract: For the production of a nonwoven web from a primary nonwoven web a conventional carding drum is used as well as a collecting surface, on which a vacuum is applied and which is continuously moved and serves to collect the fibers flying from the carding drum. In order to ensure desirable conditions for the entrainment of the fibers flying off, the fibrous covering on the carding drum is sucked from consecutive layers on consecutive portions of the surface of the drum so as to from partial streams of fibers in suction passages between the carding drum and the collecting surface.