Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
  • G01N21/84—Systems specially adapted for particular applications
  • G01N21/88—Investigating the presence of flaws or contamination
  • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
  • G01N21/8914—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the material examined
  • G01N21/8915—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the material examined non-woven textile material
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
  • G01B11/00—Measuring arrangements characterised by the use of optical techniques
  • G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
  • G01B11/10—Measuring arrangements characterised by the use of optical techniques for measuring diameters of objects while moving
  • G01B11/105—Measuring arrangements characterised by the use of optical techniques for measuring diameters of objects while moving using photoelectric detection means
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
  • G01N33/36—Textiles
  • G01N33/365—Filiform textiles, e.g. yarns

Definitions

• the invention relates to a device for contactless measurement of a linear textile formation such as yarn, thread, textile fibre, sliver, etc. containing a radiation source and a radiation sensor consisting of a system of radiation-sensitive elements.
• the aim of the invention consists in reducing the costs of the device for contactless measurement of a linear textile formation such as yarn, thread, textile fibre, sliver, etc. and in permitting to improve the parameters of the contactless measurement of a linear textile formation such as yarn, thread, textile fibre, sliver, etc.
• the aim of the invention has been reached by a device for contactless measurement of a linear textile formation such as yarn, thread, textile fibre, sliver, etc., whose principle consists in that the radiation sensor consists of a CMOS optical sensor.
• the advantage of this device consists in lower costs of the CMOS optical sensors as compared with the CCD sensors.
• Another advantage of the device consists in the sensing velocity of the CMOS optical sensor, superior to that of the CCD sensor, and in the fact that the output signal can be processed better and simpler than the output signal of the CCD sensor.
• the device according to the invention can be used for determining both the thickness of a moving linear textile formation by evaluating the irradiation state of the elements of the CMOS optical sensor and for determining the homogeneity of a moving linear textile formation by evaluating the irradiation state of the elements of the CMOS optical sensor.
• These two variants can be combined at will for obtaining more exact results of the monitoring of the thickness and/or of homogeneity of a moving linear textile formation, and their use depends especially on the type and the properties of the monitored linear textile formation and on the technological needs and possibilities of the device used for the monitoring.
• the device is intended for mass application in textile machines, in particular in spinning and winding machines.
• CMOS optical sensors over CCD sensors working on the principle of the electric charge coupling consists in the substantially higher resistance of the CMOS optical sensors, as compared with the CCD sensors, to the mutual influence exerted by the neighbouring radiation-sensitive elements. This is due to the fact that in the CCD sensors the electric charge passes to an extent between the neighbouring radiation-sensitive elements and thus impairs the measurement precision.
• the CMOS optical sensor preferably contains at least one row of radiation-sensitive elements situated next to each other.
• the CMOS optical sensor preferably contains at least one row of radiation-sensitive elements whose dimension in the direction of the length of the row of radiation- sensitive elements is inferior to their dimension in the direction perpendicular to the length of the row of radiation-sensitive elements.
• Fig. 1 is an axonometric view of the device with a CMOS optical sensor of radiation
• Fig. 2 is a section of the device of Fig. 1 in the sensing plane
• Fig. 3 is a section of a device comprising a point source of radiation in the sensing plane
• Fig. 4 is a section in the sensing plane of an embodiment in which the plane passing through the axis of the linear textile formation and through the radiation source forms an acute angle with the representation plane.
• the device for contactless measurement of a linear textile formation such as yarn, thread, textile fibre, sliver, etc. will be described in more detail on examples of embodiment for determining the thickness and/or homogeneity of yarn.
• homogeneity is intended to mean mass uniformity. Since the core of yarn 1. is opaque, the yarn homogeneity is monitored in the circumferential part of the yarn 1.
• thickness is intended to mean diameter uniformity.
• the moving linear textile formation consists of the yarn 1 which is in a well-known manner delivered from a well-known spinning device 2.
• the yarn 1 is delivered by a well-known delivery device which in the shown embodiment functions also as a first stabilization means 3 of the path of the yarn 1 consisting in the shown example of embodiment of guiding rollers.
• a second stabilization means 4 Inserted into the path of the yarn ⁇ is in the shown embodiment a second stabilization means 4 consisting in the shown example of embodiment also of guiding rollers out of which the yam 1 is led in the direction of the arrow 0 to well-known not represented means for winding the yarn 1 on a bobbin.
• the stabilization means can consist also of other suitable yarn guiding means, or the stabilization means can be dispensed with altogether.
• the yarn 1 passes through a radiation flux 5 emitted by a radiation source 6 made in the embodiment shown in Fig. 1 as a point radiation source 60.
• a radiation sensor 7 consisting of a CMOS optical sensor 70 fitted with a plurality of radiation-sensitive elements 700 arranged next to each other substantially normal (perpendicular) to the direction of the motion of the measured linear textile formation.
• Each of the plurality of the radiation-sensitive elements of the CMOS optical sensor 70 is coupled with an evaluation device 8 of the state and/or degree of its irradiation.
• the evaluation device 8 can be made as an integral part of the CMOS optical sensor 70.
• the evaluation device 8 is able to evaluate the function of the CMOS optical sensor 70 and is fitted with an output 80 of information on the monitored parameters of the yarn 1 measured by the CMOS optical sensor 70, in particular on the thickness, hairiness, etc., of the yarn ⁇ .
• the output 80 of the evaluation device 8 can be connected with means for further processing the data determined by the CMOS optical sensor 70, for instance with the control system of the machine or of the operating unit and/or with a displaying device and/or with a recording device and/or with regulation means of the operating unit of a machine and/or with control means of the operating unit intended to interrupt the motion of the yarn and/or to stop at least some of the functional components of the operating unit of the machine, etc.
• the device for the contactless measurement of a linear textile formation can be fitted with a suitable control device and/or with a feedback control system for controlling the intensity of the radiation emitted by the radiation source 6.
• the point source 60 of radiation emits radiation and generates a radiation flux 5 falling on the radiation-sensitive elements 700 of the CMOS optical sensor 70.
• the path of the yarn ⁇ intersects the radiation flux 5.
• a sensing plane 50 passes through the point source 60 of radiation and through all radiation-sensitive elements 700 of the CMOS optical sensor 70.
• the yarn lying in the radiation flux 5 and moving in the direction of its longitudinal axis overshadows some of the elements 700 of the CMOS optical sensor 70 that receives the radiation, and the state of irradiation of each of the radiation- sensitive elements 700 and/or the degree of their irradiation is suitably used for calculating and/or evaluating the monitored parameters of the yarn 1. such as its thickness and/or hairiness, homogeneity of the sliver, dimension of the core of moving core thread, etc.
• the device for contactless measurement of a linear textile formation such as yarn, thread, textile fibre, sliver, etc. shown in the drawing can be further modified so as to meet the specific needs of some technological processes while maintaining the positioning of the elements 700 in a straight line lying in the sensing plane 50, not parallel with and having no common point with the path of the moving yarn as it is in the section of the sensing plane 50 with the point source 60 of radiation according to Fig. 1 shown in Fig. 2.
• the point source 60 of radiation is situated in a plane passing through the longitudinal axis of the yarn and normal (perpendicular) to the straight line in which the elements 700 of the CMOS optical sensor 70 are located.
• Fig. 3 shows another modification of the device according to Fig. 1 in the section of the sensing plane 50.
• the point source 60 of radiation is replaced by a straight line source source 6_1 of radiation.
• the radiation flux 5 consists of parallel rays so that this embodiment is suitable in particular for considerably thick yarns 1 or other linear textile formations because the picture of the yarn ⁇ appearing on the radiation sensor 7 consisting of a plurality of radiation-sensitive elements 700 is equal to the thickness of the linear formation lying in the radiation flux 5.
• the monitoring of the thickness and/or homogeneity of the yarn 1 by this method is discontinuous even if it permits a higher sampling speed of the linear textile formation in question.
• the distance between the sensing planes 50 is in stabilized state as a rule constant but it can vary, for instance it can decrease in response to the detection of a sudden change in the thickness and/or homogeneity of the yam ⁇ .
• the CMOS optical sensor can be made of rectangular-shaped radiation-sensitive elements 700 so arranged that their smaller dimension is perpendicular to the direction of motion of the measured linear textile formation, i.e., in the direction of the length of the row of the radiation-sensitive elements 700, and that their greater dimension is situated in the direction of motion of the measured linear textile formation, i.e., in the direction normal to the length of the row of the radiation-sensitive elements 700. Due to this, the radiation-sensitive elements 700 are during the measurement of the linear textile formation situated with their smaller dimension in the direction of the thickness of the measured linear textile formation, and with their greater dimension in the direction of the length of the measured linear textile formation.
• the device for contactless measurement of a linear textile formation such as yarn, thread, textile fibre, sliver, etc.
• a control unit of the operating unit which can also evaluate and process the measured values of the parameters of the linear textile formation.
• the evaluation device 8 of the device for contactless measurement of a linear textile formation can in addition to its own function consisting in the measurement of a linear textile formation ensure also the activities of the control unit of the operating unit of a textile machine.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Physics & Mathematics (AREA)
• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• General Physics & Mathematics (AREA)
• Analytical Chemistry (AREA)
• Biochemistry (AREA)
• General Health & Medical Sciences (AREA)
• Immunology (AREA)
• Pathology (AREA)
• Medicinal Chemistry (AREA)
• Food Science & Technology (AREA)
• Spinning Or Twisting Of Yarns (AREA)
• Treatment Of Fiber Materials (AREA)

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Publications (1)

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Citations (4)

• 2000
  • 2000-11-02 CZ CZ20004069A patent/CZ299647B6/cs not_active IP Right Cessation
• 2001
  • 2001-10-31 EP EP20010980150 patent/EP1332333A1/en not_active Withdrawn
  • 2001-10-31 WO PCT/CZ2001/000058 patent/WO2002037056A1/en active Application Filing
  • 2001-10-31 AU AU2002212075A patent/AU2002212075A1/en not_active Abandoned

Patent Citations (4)

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