Abstract: A method and device are provided for removing a faulty yarn portion at a work station of an open-end spinning machine after the work station is stopped in a controlled manner, particularly after a defect of the spun yarn is detected by a quality sensor. Prior to a request to connect a suction nozzle of the work station for sucking off of the faulty yarn portion, the value of a vacuum in a central channel of the vacuum system of the open-end spinning machine is determined and evaluated. The suction nozzle is connected to the central vacuum channel only after the current capacity of the vacuum source detected is sufficient, or only after a sufficiently high vacuum is achieved.

Abstract: The invention relates to a method for removing the faulty yarn portion at a work station of an open-end spinning machine after the work station is stopped in a controlled manner, particularly after a defect of the spun yarn is detected by a sensor (1) of yarn quality, whereby prior to the request to connect a suction nozzle (2) of a work station for sucking off of the faulty yarn portion the value of the vacuum in the central channel (3) of the vacuum system of an open-end spinning machine is found out and evaluated and the suction nozzle (2) of a work station is connected to the central vacuum channel (3) only after the current capacity of the vacuum source detected is sufficient or only after a is sufficiently high vacuum is achieved. The invention also relates to a device for removing the faulty yarn portion at a work station of an open-end spinning machine.

Abstract: A CMOS optical detector includes a plurality of optical elements for a device for detecting parameters of moving yarn or another linear textile formation on textile machines by means of a perpendicular projection of yarn onto individual optical elements of a sensor with the aid of one source of radiation. The optical elements are arranged in two parallel rows perpendicular to the direction of the movement of the projection of yarn. Each optical element produces an output analog signal corresponding to the intensity of its irradiation. The individual optical elements of the first row are oriented to have their longer sides in the direction of the movement of the projection of yarn, whereas the optical elements of the second row are oriented to have their longer sides perpendicular to the direction of the movement of the projection of yarn.