Abstract: A yarn withdrawal apparatus for continuously withdrawing a yarn from a feed yarn package and then from a reserve package, where the trailing yarn end on the feed package is knotted to the leading end of the yarn on the reserve package. The transition of the yarn from the feed yarn package to the reserve yarn package is detected by a sensor, which includes a movable yarn guide, which moves during the transition from an inactive position to a signaling position in a first degree of freedom of movement. To prevent the movable yarn guide from rebounding when it reaches the signaling position, the yarn guide or an element connected thereto defines a second degree of freedom of movement which is different from the first degree of freedom of movement, and such that after the rebound the movement is of such a kind that a departure from the signaling position back toward the inactive position is geometrically not possible.

Abstract: A yarn withdrawal apparatus for continuously withdrawing a yarn from a feed yarn package and then from a reserve package, where the trailing yarn end on the feed package is knotted to the leading end of the yarn on the reserve package. The transition of the yarn from the feed yarn package to the reserve yarn package is detected by a sensor, which includes a movable yarn guide, which moves during the transition from an inactive position to a signaling position in a first degree of freedom of movement. To prevent the movable yarn guide from rebounding when it reaches the signaling position, the yarn guide or an element connected thereto defines a second degree of freedom of movement which is different from the first degree of freedom of movement, and such that after the rebound the movement is of such a kind that a departure from the signaling position back toward the inactive position is geometrically not possible.

Abstract: A method and an apparatus for continuously unwinding a yarn from a yarn package which may be associated with a method and apparatus for texturing the withdrawn yarn. The yarn is withdrawn from a feed yarn package supported in a creel, and the trailing yarn end of the feed yarn package connects to a leading yarn end of a second feed yarn package (reserve package) by a knot-type piecing to achieve a continuous advance of the yarn for its treatment or processing. A sensor is provided which detects and signals the yarn change from the feed yarn package to the reserve package after the feed yarn package is unwound, and the signal may be used to control the texturing process.

Abstract: A method and an apparatus for continuously unwinding a yarn from a yarn package which may be associated with a method and apparatus for texturing the withdrawn yarn. The yarn is withdrawn from a feed yarn package supported in a creel, and the trailing yarn end of the feed yarn package connects to a leading yarn end of a second feed yarn package (reserve package) by a knot-type piecing to achieve a continuous advance of the yarn for its treatment or processing. A sensor is provided which detects and signals the yarn change from the feed yarn package to the reserve package after the feed yarn package is unwound, and the signal may be used to control the texturing process.

Abstract: A method of storing in a memory having a predetermined number of storage spaces signals representative of deviations in the tension continuously monitored in a plurality of strands of yarn running in a textile machine. The signals from the individual strands are sequentially fed into a memory and are initially stored in the available spaces. Once the memory is filled, the highest number of earlier stored signals is reduced by later signals being written over them.

Abstract: In monitoring the yarn tension at each of a plurality of yarn processing stations, the mean value of the monitored tension is continuously determined at each station, and the differential between the monitored value and the mean value is also continuously determined. In addition, an overall mean value is generated which is representative of an average of the mean value signals from all of the individual stations, and the overall mean value is compared with the individual mean value of each station. In the event the mean value signal at a particular station differs from the overall mean value signal by more than a predetermined tolerance limit, an alarm signal is generated.

Abstract: A method and apparatus measures the tension of an advancing yarn which is subject to interruptions of the yarn path, resulting for example from the severance of the yarn. During such interruptions, the zero setting of the tension sensor does not always return to zero, thereby providing an erroneous output reading during subsequent yarn advancing cycles. In accordance with the present invention, a circuit is provided which identifies such errors and sounds an alarm when the error exceeds a predetermined limit. Also, the erroneous output signal is input as the zero point signal for the subsequent yarn advancing cycle, and during such subsequent cycle, the tension is determined on the basis of the newly set zero point.