The invention relates to a method for the non-contact detection of imperfections in a running thread (5), wherein imperfections are formed, in particular, by projecting filaments (7) or by filament ruptures or by entrained dirt particles or lint balls, wherein on a textile machine, preferably on a spooling location or on a winder of a textile machine, a geometrical optics sensor unit (1) having at least three light barriers (2, 3) is used, of which a first light barrier (3) referred to as a shading light barrier forms a shading optics through which the running thread (5) traverses and which detects the structures of the running thread (5), and of which at least two further trigger light barriers (2) are arranged at different distances to the thread (5) and/or on different sides of the thread (5) such that only imperfections of the running thread (5) cause shading of the trigger light barriers, wherein the working point of the trigger light barriers is adjusted or tracked continuously or at predetermined times in order to compensate for potential dirt accumulation on the trigger light barriers or to suppress aging symptoms of the components of the geometrical optics sensor unit, and wherein a working point shift that occurred on the trigger light barriers (2) is applied to the shading light barrier (3) such that the working point of the shading light barrier (3) is adjusted or tracked with a predeterminable dependence on the working point shift of the trigger light barriers (2).
The invention relates to a method for determining the instantaneous winding speed (v) of a moving thread (10) being wound onto a spool (1), wherein the thread (10) moves back and forth over a traverse range (11) during winding in successive traversing periods (17), said traverse range extending at least over part of the axial width of the spool (1). The method comprises the following process steps: determining, at least once, a speed profile (15) that indicates the instantaneous winding speed (v) of the thread (10) at least at individual points as a function of the instantaneous axial position (14) of the thread (10) within a traversing period (17), determining the instantaneous axial position (14) of the thread (10) within a traversing period (17) at least at individual points, determining the instantaneous winding speed (v) of the thread (10) from the instantaneous axial position (14) of the thread (10) within a traversing period (17) by way of the functionality established from the speed profile (15). The invention further relates to an apparatus suitable for carrying out this method.
The invention relates to a method for contactlessly determining the instantaneous velocity of a running thread by means of at least one optical detector, wherein the detector generates, according to the laser Doppler anemometry method, measurement signals (1, 1a, 1b, 2, 2a, 2b) in the form of frequencies which depend on at least one laser beam that is influenced and/or reflected by the thread and which are electronically evaluated in order to determine the instantaneous velocity of the running thread, wherein those frequencies which are below a cut-off frequency (3, 3a, 3b) are at least temporarily masked during the electronic evaluation, and wherein the cut-off frequency (3, 3a, 3b) depends on an average velocity of the running thread. The invention also relates to an arrangement which is suitable for carrying out this method.
The invention relates to a method for the contactless determination of the diameter of a running thread (4) by means of an optical sensor unit (6a, 6b) that is positioned in the run of thread of a textile machine. According to the invention: a laser beam (2) is generated by a laser source (1), said beam being split into at least two sub-beams (2a, 2b) by means of an optical splitter and guide unit (3); the two sub-beams (2a, 2b) are directed in such a way that they impinge at least partially on a respective optical detector (6a, 6b); the two sub-beams are directed in such a way that one sub-beam is directed onto the thread (4) as a measuring beam (2a), creating a shadow and the other sub-beam is directed past the thread (4) as a reference beam (2b); the signals (8a, 8b) produced by the two optical detectors (6a, 6b) in accordance with the respective amounts of light received are combined to form a diameter signal (10), which is electronically evaluated to determine the diameter of the thread (4). The invention also relates to an assembly that is suitable for carrying out said method.
The invention relates to a method for determining in a contactless manner the speed and/or length of a running thread (4) by means of an optical sensor device which is arranged in the run of the thread of a textile machine and which comprises at least one optical detector (6b). Said method comprises the following steps: passing the thread (4) through a measurement volume (5), generating a laser beam (2) by means of a laser source (1), collimating the laser beam (2) by means of an optical device (7), splitting the laser beam (2) into at least two partial beams (2a, 2b) by means of an optical splitting and guiding device (3) to split and guide the laser beam (2), guiding the two partial beams in such a manner that a partial beam is guided as a measurement beam (2a) onto the thread (4) in the measurement volume (5) and a shadow is cast thereon by the thread and the other partial beam is guided as a reference beam (2b) past the thread (4) and onto an optical detector (6b), superimposing the light of the measurement beam (2a) that is influenced and/or reflected by the thread (4) with the light of the reference beam (2b), electronically evaluating the measurement signals produced by the optical detector (6b) according to the laser Doppler anemometry method to determine the speed and/or the length of the running thread (4). The invention further relates to an arrangement for carrying out said method.
G01P 3/36 - Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
B65H 61/00 - Applications of devices for metering predetermined lengths of running material
G01B 11/04 - Measuring arrangements characterised by the use of optical techniques for measuring length, width, or thickness specially adapted for measuring length or width of objects while moving
G01S 17/58 - Velocity or trajectory determination systemsSense-of-movement determination systems
6.
METHOD AND ARRANGEMENT FOR MONITORING AND OPTIMIZING A WINDING PROCESS
The invention relates to a method for determining, in a contactless manner, parameters of a running thread (2) and/or monitoring and/or optimizing a winding process of a running thread (2), especially when forming a bobbin (3) wound from a running thread (2). In said method, a sensor device (5) is used at a winding point of a textile machine, said sensor comprising at least two sensors (6a, 6b) that operate in a contactless manner and are disposed one behind another at a fixed distance (d) in the direction of travel of the thread (2). The disclosed method encompasses the following steps: thread signals (xn, yn) that depend upon the structure and/or the speed of the running thread (2) are detected continuously or at predefined intervals by means of two sensors (6a, 6b); the thread signals (xn, yn) are fed to an evaluation unit (7); each thread signal (xn, yn) detected by the two sensors (6a, 6b) is initially transformed into two complex signal spectra (X(j쳱), Y(j쳱)) by means of Fourier transformation; a common complex data field (Z(j쳱)) is formed at least from parts of the two complex signal spectra (X(j쳱), Y(j쳱)) by means of a complex conjugated multiplication process; the common complex data field (Z(j쳱)) is inverse-transformed into the time domain by means of inverse Fourier transformation; a maximum of the data field z(t) that has been inverse-transformed into the time domain is determined; and the speed (v) of the running thread (2) is determined from the delay corresponding to the position of the determined maximum and the distance (d) between the two sensors (6a, 6b). The invention further relates to an arrangement that is suitable for carrying out said method.
B65H 61/00 - Applications of devices for metering predetermined lengths of running material
G01P 3/80 - Devices characterised by the determination of the time taken to traverse a fixed distance using auto-correlation or cross-correlation detection means
7.
METHOD AND ARRANGEMENT FOR DETERMINING THE YARN QUALITY AND/OR SPOOL QUALITY OF A RUNNING THREAD BASED ON LASER-DOPPLER ANEMOMETRY
The invention relates to a method for non-contacting determination and/or increasing the yarn quality of a running thread (8) or the quality of a spool (20) which is obtained by winding up a running thread (8), or for a non-contacting determination of a possible breakage and/or jamming of a running thread (8), by means of a sensor device which is arranged at a spool point (6) in a textile machine, with a laser beam (3) being produced by a light source (2) and being split by means of an optical splitting and guidance device (4) for splitting and guidance of the laser beam (3) into at least two beam elements (5a, 5b), which are then guided such that they are joined together again at the thread (8), with the laser-doppler anemometry method being used to produce measurement signals from the light which is reflected from the thread (8), which measurement signals are evaluated electronically in order to determine the yarn quality of the running thread (8), with respect to its hairiness or in order to determine the spool quality or to determine thread breakage and/or thread jamming. The invention also relates to an arrangement which is suitable for carrying out this method.
G01P 3/36 - Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
B65H 61/00 - Applications of devices for metering predetermined lengths of running material
B65H 63/00 - Warning or safety devices for use when unwinding, paying-out, forwarding, winding, coiling, or depositing filamentary material, e.g. automatic fault detectors or stop-motions
B65H 63/08 - Warning or safety devices for use when unwinding, paying-out, forwarding, winding, coiling, or depositing filamentary material, e.g. automatic fault detectors or stop-motions responsive to delivery of a measured length of material, completion of winding of a package, or filling of a receptacle
B65H 63/032 - Warning or safety devices for use when unwinding, paying-out, forwarding, winding, coiling, or depositing filamentary material, e.g. automatic fault detectors or stop-motions responsive to reduction in tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic
8.
METHOD AND ARRANGEMENT FOR PRODUCING AN ENLARGED MEASUREMENT VOLUME FOR THE PURPOSE OF DETERMINING THE STRUCTURE AND/OR WINDING SPEED OF TEXTILE FIBRES ON THE BASIS OF LASER DOPPLER ANEMOMETRY
The invention relates to a method and an apparatus for contactlessly determining the structure and/or speed of a thread (8) running in the thread run (6) of a textile machine using a sensor device, wherein a laser beam (3) is produced by a light source (1, 2) and is divided into at least two partial beams (5a, 5b), which meet again at the thread (8), using a device (4) for dividing and guiding the laser beam (3), wherein the laser beam (3) which is produced by the light source (1, 2) is divided into a reference beam (5a) and a scattering beam (5b) by the dividing and guiding device (4), wherein the intensity of the scattering beam (5b) is at least twice as high as the intensity of the reference beam (5a), wherein the beams are oriented at an angle (ß) with respect to one another, even when emerging from the dividing and guiding device (4), such that they cross at the thread (8), and wherein the transverse dimension of the reference beam (5a) is greater than the transverse dimension of the running thread (8), wherein that portion of the reference beam (5a) which passes the thread (8) is guided into the optical sensor device (9, 10, 11) which is provided for carrying out the laser Doppler anemometry method.
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