Abstract: The apparatus comprises a stretching unit (S) delivering two stretched fiber rovings (4, 5). One fiber roving (4) serves as the core for the wrapped yarn to be produced and runs to a twist-imparting device (6, 7). The fibers of the other fiber roving (5) are transferred to a moving fiber feeding and holding surface (9) constituted by a perforated peripheral surface of a hollow disk (10). This surface (9) comes into contact with the core (4) at a point (C) in front of the twist-imparting device (6, 7). At this contact point (C), the fibers fed on the surface (9) are seized by the rotating core (4) and wound up. At the contact point (C), a fiber catching device (12) is likewise arranged, having an air-permeable surface (11) behind which a vacuum is maintained.
Abstract: A twist generator for a running fiber aggregate possesses two friction discs rotating in opposite directions and having end faces turned towards one another for the twisting of the fiber aggregate running between the friction discs. One friction disc is made flexible and is pressed by pressure rollers towards the end face of the other friction disc and consequently against the fiber aggregate. To allow defined conditions to be obtained as regards pressing force, there are two pressure rollers, of which one is arranged shortly before and the other shortly after the thread contact point of the friction discs in the direction of movement of the flexible friction disc. The two pressure rollers are mounted next to one another, but preferably offset in the direction of movement of the fiber aggregate, on a carrier which is pivotably fastened to a spring-loaded lever. The distribution of the pressing force to the two pressure rollers can be changed by adjusting the carrier relative to this lever.
Abstract: A twist is imparted to fiber slubbing (1) exiting from drawing rollers (2) by means of twister (4). Oriented, parallelized fibers (F) are applied to rotating fiber slubbing (1) in front of or within twister (4), the fibers (F) wrapping themselves around core thread (1). Because of these fibers (F), the twist of fiber slubbing (1) no longer unravels completely after twister (4), so that a spun thread (12) of great strength is obtained. The feed of fiber (F) to fiber slubbing (1) occurs by means of rotating feed element (8). It has a circular perforated surface (9), behind which a negative pressure is maintained to keep fibers (F) on the surface. The oriented, parallelized fibers (F) exit from drawing rollers (10) and are conveyed to perforated surface (9). The rotating fiber slubbing (1) comes into contact with surface (9) and then draws fibers (F) from surface (9).
Abstract: The apparatus is usable with a funnel wheel and a tube which undergoes tumbling movements for receiving a rope-like strand of fibers from a card or drawing frame and piling the strand of fibers in cycloidal loops in a ramp, through which the rope-like strand is moved to be loaded into cans, typically known as spinning cans. The ramp may be tubular, and may be vibrated. The ramp leads to a first support which is provided with clamps for holding a can. The first support is tiltable, and means are provided for severing the rope-like strand between the ramp and the can when the can is filled to a predetermined extent. A tiltable twin support is provided with clamps for receiving and holding a filled can from the first support, and for receiving, holding and transferring to the first support an empty can to be filled. The twin support can be tilted and moved transversely for receiving a loaded can from the first can support and transferring an empty can to the first support.
Abstract: Apparatus for surveying the condition of roving is mounted on an automatic yarn knotting device movable along a spindle row in a textile machine having a drafting device for roving allocated to each spindle. When a roving breakage is indicated, the knotting device stops at the appropriate position and a first detecting device on a pivoted lever is moved to a position in which it checks the presence of roving passing through the drafting device. If there is no roving due to exhaustion of supply, no knotting is effected, but if roving is present the knotting device is prepared and a second lever moves a second detecting device to two output rollers for delivery of roving from the drafting device. If this second device detects no wrapping of roving on one of the two output rollers, the knotting process is initiated.