Abstract: Yarn processing system for simultaneously processing a plurality of yarns in a processing machine, such as a twisting machine, a texturizing machine, or a dyeing machine. A yarn tensioning assembly is provided and has, for each yarn entering the processing machine, at least an individual controlled tensioner and an individual tensiometer. The controlled tensioner and the tensiometer are integrated into a closed yarn tension feedback regulation loop for regulating and maintaining a set yarn tension. The tensiometer is connected in parallel to one superimposed common tension monitoring and setting system for centrally setting and monitoring the yarn tension.

Abstract: A yarn braking device includes a braking body with the shape of a frustocone coat. The braking body is put over a rounded withdrawal end of a storage body and is pressed from the small diameter end by a resilient axial force against the withdrawal end. The axial force defines the braking effect between the braking body and the withdrawal end. Between a stationary holder and the braking body an axial force generator and a centering device acting in radial direction are provided. The axial force generator is formed by at least one pair of permanent magnets. The permanent magnets are axially aligned by the centering devices with an intermediate gap. The centering device neither is an axial sliding guiding system structurally and functionally separated from the pair of permanent magnets, or is formed free of contact directly by the pair of permanent magnets, respectively.

Abstract: Tensiometer for measuring the force imparted by a yarn on a bending element which is secured in a fixation, having a unitary oscillation-damping element made of an intrinsically damping material like rubber or an elastomer, the unitary damping element including a base body secured to the bending element and at least one oscillation body which can oscillate, at least substantially in the direction of the deflection of the bending element, in relation to the base body and to the bending element, and further having an energy dissipation zone between the base body and the oscillation body.

Abstract: The invention relates to a thread tensioner comprising tensioning elements that define a thread tensioning zone. In said tensioner, the first tensioning element rests on a stop and the second tensioning element can be pressed against the first tensioning element by means of an adjustable magnet contact force produced by a magnet armature and a repelling magnet actuator. The stop is located on the opposite side of the thread tensioning zone from the first tensioning element. The first tensioning element is stressed by a spring force in the direction of the second tensioning element against the stop. Said spring force is greater in the thread tensioning zone than the respectively adjusted maximum magnetic contact force. The mass of the first tensioning element is smaller than the mass of the magnet armature.

Abstract: A tensiometer for measuring thread tension, provided with a bending element fixed at one end and tensioned at the other end by the thread, at least one sensor element and damping device for oscillating the bending element. The damping device has at least one mass damper fixed to the bending element by means of a spring body.

Abstract: The invention relates to a yarn tensioning device (B) comprising a braking body (K) embodied in the form of a truncated conical jacket (3) which is coaxially positioned on the rounded discharge end (2) of a storage body (1) and is pushed to a small diameter end (5) by the elastic axial force defining a braking effect between the braking body and the discharge end (2), an axial force generator (P) disposed between a fixed holding element (10) and the braking body and a centering device (C) provided with a radial working direction and disposed between the holding element (10) and the braking body, wherein said axial force generator (P) consists of at least one pair of axially superimposed permanent magnets, an intermediate slit is arranged between said permanent magnets and the centering device (C) which is embodied in the form of a axial slide guideway (9, 12, 24, 23) which is structurally and functionally separated from the permanent magnet pair or contactlessly formed thereby.

Abstract: In order to monitor/adjust production in a circular knitting machine including several knitting systems and several yarn feeder devices, yarn is fed to active knitting systems from several supply devices operating according to at least two different yarn feeding principles, and in a non-positive manner. The individually fed amounts of yarn are continuously measured by means of scanned real rotation signals of the feeder devices. In order to obtain monitoring information and/or adjustment measures, comparisons are made with corresponding set amounts of yarn within at least one range of tolerance, the extent of which is adapted at least to yarn quality and/or yarn path parameters.

Abstract: A yarn feeding device having a storage body defining a frontal withdrawal rim which forms a yarn braking zone of a yarn brake in co-operation with a circumferentially continuous braking band in the shape of a frustocone jacket and made of a material which is elastically deformable perpendicular to the generatrix of the frustocone. The yarn brake includes a stationary support for the braking band carrier which presses the braking band substantially axially and resiliently against the withdrawal rim. The braking band is held in a floating manner in relation to the withdrawal rim and in relation to the braking band carrier.

Abstract: An axial disc brake, particularly for a yarn feeding device, having braking surfaces which are axially pressed against each other with a predetermined yieldable contact pressure. One of said braking surfaces has a spherical convex shape, and the other braking surface is conical with a cone axis lying at least approximately along the axis of the disc brake. The axial disc brake can be provided at the front end of a storage drum of a yarn feeding device of a projectile or gripper weaving machine, such that the yarn withdrawn from the storage drum rotates like the pointer of a clock along a yarn guiding surface and directly enters into the contact zone of the braking surfaces without deflection, and is deflected after having passed the contact zone gently in the axial direction.

Abstract: A yarn feeder having a stationary storage drum defining at least one cylindrical and circumferentially closed circumferential section, and a stationarily held ring-shaped yarn control element surrounding the circumferential section. The yarn control element is a finite band having a generally planar cross-section and is positioned on the circumferential section with mutually aligned, neighboring ends. The band is resistant against extension in the circumferential direction and is yieldable in the radial direction of the storage drum. Further, the band is preloaded against the circumferential section by means of an elastic tensioning device.

Abstract: A measuring feeding device for an air or water jet weaving machine having a stationary storage body for a yarn store consisting of yarn windings wound on tangentially in a predetermined winding direction, from which yarn store the yarn can be withdrawn overhead of the storage body. The device includes a stop element associated with the storage body which can be moved by means of a control unit between a stop position blocking withdrawal of the yarn and a release position allowing withdrawal of the yarn, and a yarn clamping device having a displacement drive and a brake shoe which is adjustable between a lifted position and a yarn clamping position. The braking shoe, in the yarn clamping position is positioned behind the stop element in the winding direction and is maintained in the yarn clamping position after a stroke of the stop element into the release position.

Abstract: A yarn feeding device having a yarn brake including a wear-proof, radially deformable and frustoconical braking band supported in a braking band carrier. The carrier is held substantially coaxially relative to the axis of a storage body of the yarn feeding device and against a circumferentially continuous withdrawal rim of the storage body. A stationary support and a spring assembly are provided, which spring assembly imparts an essentially axial pre-loading force onto the braking band carrier. The braking band carrier is centered in an axially displaceable fashion at the support by means of a universal joint having at least two mechanically and positively cooperating joint elements. The joint center of the universal joint coincides with the axis of the storage body.

Abstract: A device for braking a yarn and a yarn feeding apparatus having a stationary storage body for a yarn store with an annular withdrawal surface. The braking device includes a frustoconical flexible braking band which is arranged approximately coaxially relative to the withdrawal surface and to which pressure is applied in the axial direction to press the braking band against the withdrawal surface. A ring-shaped membrane made of an elastomeric or rubber material is joined in a force transmitting manner to the braking band and is supported in an outer ring holder. An end region of the annular membrane is bent back inwardly in a direction towards the withdrawal surface and is joined to the braking band thereat.

Abstract: In order to control a digital sensor S, which by means of a sensor element H responds at least to a variation of a magnetic field M and emits different output signals Y, which are sampled or detected at predetermined points in time t1, t2, t3, the analogue response signal W of the sensor element H being converted by means of a digitising hysteresis switching device T into the output signals Y, the sensor S is switched off and on again at least before the respective output signal Y is detected. The sensor S comprises a clocked interrupter U for switching the sensor S on and off alternately, the clock frequency of the sensor being adapted to the detecting frequency such that the output signal Y can only be detected if the sensor S is switched on before detection.

Abstract: An opto-electronic device (S) for detecting the movement of yarn (Y) (10) passing transversely through a detection zone (11) on the storage drum (3) of a yarn feeder (F), has at least one light source (L) directed on the detection zone (11), at least one reflector (B) fitted on the storage drum (3) a short distance away on the side of the detection zone (11) away from the light source (L) and at least one signal-generating receiver (R) directed towards the detection zone. The opto-electronic device also has a reflector which includes (B) at least one narrow and approximately flat reflection area (15, 15', 15") extending essentially parallel to the longitudinal direction of the yarn and in the circumferential direction of the storage drum (3). The reflection area is bounded at its longitudinal sides by either a strip diaphragm fitted between the reflector (B) and the yarn passage plane (13), or diaphragmed regions (17) arranged approximately in the reflector plane.

Abstract: A yarn feeder having a storage drum, a bracket fixed to the housing and a controlled yarn withdrawal brake axially displaceably held in the bracket. The yarn withdrawal brake includes a ring-shaped braking body co-operating with a yarn withdrawal region of the storage drum and further includes an outer carrier ring which is displaceable in the axial direction within a predetermined axial clearance defined in a ring-shaped holder. The predetermined axial clearance is defined by axial counter stops, and the holder includes at least one pair of shift drives which act on the carrier ring from opposite directions. At least one side surface of the carrier ring is provided with at least one group of travel stroke adjustment ramps of different axial heights, each of which ramps can be selectively aligned with an axial counter stop of the holder.

Abstract: A device for controlling the tension of a yarn includes a gauge measuring tension of the yarn and optionally a brake driven by the tension gauge to vary braking of the yarn. The gauge comprises electromagnetic control means having a moveable control element subject to a force dependent on the tension of the yarn, and a control circuit. The latter circuit supplies the electromagnetic control means with a current so that the moveable control element remains virtually still in a given position, during variations of the yarn tension. This current is indicative of the tension of the yarn and is measured to obtain a measure of the yarn tension. The device can be associated with a yarn feeder having a drum and moveable eyelet coaxial with the drum.

Abstract: A yarn feeder (F) including a holding device (H) for holding a yarn braking body in an extension arm (2, 2a) of a housing, a support body (6a) for a holder (5) of the yarn braking body (4) and a moving drive including a cylindrical piston (6b) which is movable in a cylinder (7) to move the yarn braking body (4) between a braking position and a gap position relative to a storage body (3) of the yarn feeder (F). The piston (6b) is arranged as an integrated guide element of the support body (6a) on the support body (6a). At least one guide nose (9) which engages into a guide track (10) fixed onto the extension arm is provided as a rotation preventing member on the piston and/or on the support body at a transverse distance from the piston axis (X).

Abstract: In a method of scanning, with the aid of a sensor device, a yarn of a predetermined length which is intermittently withdrawn from a winding reservoir provided on the storage drum of a yarn feeding device for weaving machines, the yarn pulse acceptance for exclusively at least one first yarn pulse is changed at an increasing yarn speed and/or upon generation of at least one first or each winding signal to a yarn pulse acceptance for further faster yarn pulses and non-acceptance of interference pulses that are slower than the second yarn pulses. A yarn withdrawal sensor which is suited for said method is characterized in that a filtering device is provided with two different selective filtering modes that differ from each other by their acceptance of yarn pulses generated at different yarn withdrawal speeds, and that the filtering device is switchable at an increasing yarn withdrawal speed from a first filtering mode to at least one further filtering mode.

Abstract: A proximity sensor H with a feeler element 16, 17 which is provided in a holder 22 and is directed towards the motion range of a magnet 28 which is movable in relation to Hall element 16 and can be caused to respond to said magnet 28 has at least one metal trimming body T, 27 in the vicinity of the sensor element such that said trimming body can be adjusted in its distance from said sensor element. The response sensitivity of said proximity sensor H can be varied by a distance adjustment of said trimming body. The proximity sensor H equipped with said trimming body T. 27 suitably is provide in a yarn feeder as a yarn sensor G or a speed- or counting sensor D and is adjustable with respect to its response sensitivity by means of said trimming body.