EP3323918A1 - Device for monitoring the sagging of a roving before a winding device of a preparatory machine for producing a roving - Google Patents

Device for monitoring the sagging of a roving before a winding device of a preparatory machine for producing a roving Download PDF

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Publication number
EP3323918A1
EP3323918A1 EP17201863.2A EP17201863A EP3323918A1 EP 3323918 A1 EP3323918 A1 EP 3323918A1 EP 17201863 A EP17201863 A EP 17201863A EP 3323918 A1 EP3323918 A1 EP 3323918A1
Authority
EP
European Patent Office
Prior art keywords
roving
radiation
sagging
elongated
area
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP17201863.2A
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German (de)
English (en)
French (fr)
Inventor
Miroslav Stusak
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maschinenfabrik Rieter AG
Original Assignee
Maschinenfabrik Rieter AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Maschinenfabrik Rieter AG filed Critical Maschinenfabrik Rieter AG
Publication of EP3323918A1 publication Critical patent/EP3323918A1/en
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
    • D01H1/14—Details
    • D01H1/36—Package-shaping arrangements, e.g. building motions, e.g. control for the traversing stroke of ring rails; Stopping ring rails in a predetermined position
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H7/00—Spinning or twisting arrangements
    • D01H7/92—Spinning or twisting arrangements for imparting transient twist, i.e. false twist
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
    • D01H1/14—Details
    • D01H1/40—Arrangements for connecting continuously-delivered material to bobbins or the like
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H13/00—Other common constructional features, details or accessories
    • D01H13/14—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
    • D01H13/16—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material
    • D01H13/1616—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material characterised by the detector
    • D01H13/1633—Electronic actuators
    • D01H13/165—Photo-electric sensing means

Definitions

  • the invention relates to a device for monitoring the sagging of a roving before a winding device of a preparatory machine for producing a roving.
  • Fine textile yarns are usually produced on spinning machines, for example on ring spinning machines.
  • the technology of fibrous material preparation for this production includes preparatory spinning in which a relatively soft roving, strengthened by a small amount of twist, is formed from a strand of staple fibers.
  • the roving is wound on a roving bobbin, which serves as a supply package for a ring spinning machine.
  • the roving In terms of dimensions and weight, the roving must be a uniform linear textile formation, which allows at the same time further processing, and so the imparted protective twist provides the roving with only low strength.
  • EP 2 112 258 discloses a device in which the resulting roving contains substantially parallelized fibers across the entire cross-section and only a few fibers on the outer surface of the roving are wound around the roving body. Consequently, the roving is sufficiently held together, which substantially replaces the protective twist of the roving formed on flyers.
  • This effect is achieved by using a pneumatic device arranged downstream of a drafting arrangement of sliver.
  • the pneumatic device comprises a vortex chamber in which the individual fibers of the sliver are wound around core fibers.
  • the roving is drawn off from the pneumatic device by draw-off rollers.
  • a winding apparatus for winding a roving which comprises a rotatable spindle for a bobbin, which is associated with a driven pair of feeding rollers which are arranged directly in front of the roving bobbin and which have a nip line through which the roving to be wound is guided.
  • the roving between the draw-off rollers and the winding device of roving freely sags to eliminate the changes in the tension of the roving when being wound, since the changes might lead to its break.
  • the sagging of the roving must be monitored so that the roving tension before the winding device of the preparatory machine for producing a roving is maintained within predetermined limits needed for the optimal winding of the roving.
  • the goal of the invention is to provide a device for monitoring the sagging of a roving which would be reliable, inexpensive and easy to produce due to its simple design.
  • the goal of the invention is achieved by a device for monitoring the sagging of a roving, whose principle consists in that in the area of the maximum sagging of the roving is arranged a sensor of the sagging of the roving, which comprises an elongated source of modulated radiation, which is oriented towards the roving, and an elongated sensor of radiation for monitoring the radiation reflected from the roving, arranged parallel to the elongated source of radiation, whereby the length of the elongated source of radiation and the length of the elongated sensor of radiation is greater than the presumed maximum sagging of the roving.
  • a device for monitoring the sagging of a roving whose principle consists in that in the area of the maximum sagging of the roving is arranged a sensor of the sagging of the roving, which comprises an elongated source of modulated radiation, which is oriented towards the roving, and an elongated sensor of radiation for monitoring the radiation reflected from
  • the elongated source of radiation comprises at least one row of radiators and the elongated sensor of radiation comprises at least one row of sensing elements, each of which having a selective amplifier assigned to it.
  • This arrangement allows evaluation of each sensing element separately and enables to obtain information about the specific position of the roving in front of the sensor.
  • each selective amplifier contains a resonant circuit with a synthetic inductance to selectively evaluate only the modulated radiation of the respective elongated source.
  • this arrangement eliminates the saturation of the sensing elements by strong light (radiation) while maintaining their sensitivity and dynamics.
  • the selective amplifiers are connected via a derivatively integrating detector and evaluation members to a control system.
  • the control system enables to regulate the speed of the roving entering the area of the sagging of the roving, leaving the area of the sagging of the roving or simultaneously both on the side of the roving entering the area of the sagging of the roving and on the side of leaving the area of the sagging of the roving.
  • FIG. 1 shows the location of the sensor of the sagging of the roving between the draw-off rollers of the pneumatic device and the winding device
  • Fig. 2 shows the device according to the invention with the roving shown in front of the sensor and the control system
  • 3a represents a diagram of a resonant circuit with real inductance
  • Fig. 3b is a schematic diagram of a resonant circuit with synthetic inductance.
  • a preparatory machine for producing a roving it is important to secure the sagging of the roving 1 between the draw-off rollers 2 of a pneumatic device 3 for winding outer fibers around the roving 1 body and a winding device 4 of the roving 1 on a bobbin 41 to eliminate the changes in the tension of the roving 1 which could lead to its break.
  • the ratio of the speed of the draw-off rollers 2 of the pneumatic device 3 and the winding device 4 of the roving is regulated according to the size of the sagging.
  • the device for monitoring the sagging of the roving 1 before the winding device 4 comprises an elongated source 5 of radiation, which is positioned adjacent to the path of the roving 1 in the area of the maximum sagging of the roving 1 and is oriented towards the roving 1.
  • the length of the elongated source 5 of radiation is greater than the presumed maximum sagging of the roving 1 and in an exemplary embodiment it is about 30 cm.
  • the elongated source 5 of radiation comprises a plurality of radiators 51 arranged in at least one row, which in the exemplary embodiment are formed by LED diodes emitting infrared radiation.
  • the radiators 51 are connected to a means 6 for generating modulated radiation with a selectable but predetermined pulse frequency.
  • An elongated sensor 7 of radiation which serves to monitor the radiation reflected from the roving 1, is mounted parallel to the elongated source 5 of radiation and next to it in the area of the lowest sagging of the roving 1 and is oriented towards the roving.
  • the length of the elongated sensor 7 is the same as the length of the elongated source 5 of radiation.
  • the elongated sensor 7 of radiation comprises sensing elements 71 arranged in at least one row, each of which being aligned with a selective amplifier 72, which comprises a parallel resonant circuit with synthetic inductance L s , which makes it highly resistant to the ambient DC and alternating light.
  • the sensing element 71 thus connected selectively evaluates only the modulated light of its own source 5 of radiation, eliminating the saturation of the sensing elements 71 by strong light due to the principle of impedance characteristics of the resonant circuit, while preserving their reception characteristics such as sensitivity and dynamics.
  • the outputs of the selective amplifiers 72 are connected via a derivatively integrating detector 73 to the evaluation member 74 for processing the signal into information before which sensing elements 71 the roving is situated.
  • the evaluation member 74 is composed of a microprocessor.
  • the evaluation member 74 and the superior control system 9 are bi-directionally interconnected by a CAN bus 8, whereby the superior control system 9 can be connected at least to the drive of the draw-off rollers of the roving 1 from the pneumatic device for regulating the speed of the roving 1 withdrawal to ensure the optimal sagging of the roving 1.
  • control system 9 is connected to the winding device 4 of the roving 1 onto a bobbin 41 for regulating the speed of the roving 1 leaving the area of the sagging of the roving 1 to optimize the sagging of the roving 1 .
  • control system 9 is connected to the drive of the draw-off rollers of the roving 1 from the pneumatic device for the regulation of the speed of the roving 1 withdrawal, as well as to the winding device 4 of the roving 1 on a bobbin 41 for the regulation of the speed of both the roving 1 entering the area of the sagging of the roving 1 and the roving 1 leaving the area of the sagging of the roving 1 to optimize the sagging of the roving 1.
  • the sensing element 71 is formed by a phototransistor 710, on which the modulated radiation 500 falls and which is powered through inductance, which may be composed of real inductance L, as shown in Fig. 3a , or synthetic inductance L s , as shown in Fig. 3b .
  • the synthetic inductance L s comprising an operational amplifier 70 from whose output the phototransistor 710 is powered.
  • the synthetic inductance L s C1xR1xR2/2.
  • the method for monitoring the sagging of a roving 1 consists in that modulated radiation 500 having two different intensities is emitted towards the plane of the sagging of the roving from the elongated source 5 of radiation arranged vertically adjacent to the path of the roving 1 at the point of the lowest sagging, the length of the source 5 of radiation being greater than the presumed maximum sagging of the roving 1.
  • Parallel to the elongated source 5 of radiation is mounted the elongated sensor 7 of radiation comprising radiation-sensitive sensing elements 71 arranged in a row for sensing the modulated radiation 500 reflected from the roving 1. Due to the thickness of the roving the reflected radiation is usually sensed by one to three sensing elements 71.
  • the irradiated sensing element 71 converts the radiation into an electrical signal, which is further processed in the selective amplifier 72 with synthetic inductance L s , whose selectivity corresponds to the frequency of the radiation modulation, thus ensuring ambient light resistance. Subsequently, this signal is rectified by a derivatively integrating detector 73 and processed by the evaluation member 74 into the information before which radiation-sensitive element 71 the roving is situated.
  • This information is subsequently transmitted through the CAN bus 8 by using another suitable method to the superior control system 9, which afterwards regulates the speed of the roving 1 withdrawal from the pneumatic device 3 or regulates the speed of the roving 1 leaving the area of the sagging of the roving 1 or simultaneously regulates the speed of the roving withdrawal from the pneumatic device 3 as well as the speed of the roving 1 leaving the area of the sagging of the roving 1 , all that being always done with the aim of optimizing the sagging of the roving 1.
  • the invention can be used in high-performance preparatory machines for producing a roving in which the resultant roving contains substantially parallelized fibers across the entire cross-section and only a few fibers on the outer surface of the roving are wound around the roving body, whereby winding takes place in a pneumatic device.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Structural Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
EP17201863.2A 2016-11-21 2017-11-15 Device for monitoring the sagging of a roving before a winding device of a preparatory machine for producing a roving Withdrawn EP3323918A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CZ2016-721A CZ2016721A3 (cs) 2016-11-21 2016-11-21 Zařízení pro sledování průvěsu přástu před navíjecím zařízením přípravárenského stroje pro výrobu přástu

Publications (1)

Publication Number Publication Date
EP3323918A1 true EP3323918A1 (en) 2018-05-23

Family

ID=60327213

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17201863.2A Withdrawn EP3323918A1 (en) 2016-11-21 2017-11-15 Device for monitoring the sagging of a roving before a winding device of a preparatory machine for producing a roving

Country Status (3)

Country Link
EP (1) EP3323918A1 (cs)
CN (1) CN108085797A (cs)
CZ (1) CZ2016721A3 (cs)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB946240A (en) * 1960-06-01 1964-01-08 Tmm Research Ltd Improvements in speed frames and like textile machines
EP0134195A1 (en) * 1983-08-02 1985-03-13 Howa Kogyo Kabushiki Kaisha Apparatus for controlling the winding speed of roving in roving frame
JPS6285036A (ja) * 1985-10-09 1987-04-18 Toyoda Autom Loom Works Ltd 粗紡機の粗糸巻取り張力の制御方法
JPS62299521A (ja) * 1987-05-29 1987-12-26 Toyota Autom Loom Works Ltd 粗紡機の粗糸巻取張力制御装置
US5774940A (en) * 1996-07-19 1998-07-07 North Carolina State University Draftless sliver coiler packaging system for automated textile drafting system
EP1009870A1 (de) * 1997-09-01 2000-06-21 Maschinenfabrik Rieter Ag Reguliertes streckwerk
US20080070772A1 (en) * 2004-06-22 2008-03-20 Yasuhisa Mizuno Folding Device and Printing System

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0672332B2 (ja) * 1986-05-23 1994-09-14 豊和工業株式会社 粗紡機における粗糸巻取速度の制御方法
DE29825169U1 (de) * 1997-09-01 2005-10-06 Maschinenfabrik Rieter Ag Streckwerk
DE20101126U1 (de) * 2001-01-23 2001-04-19 Dietze & Schell Maschinenfabrik GmbH, 96450 Coburg Vorrichtung an einem Direkt-Rovingwickler zum berührungslosen Erfassen des Istdurchmessers der Rovingspule und Direkt-Rovingwickler mit einer solchen Vorrichtung
CN1882728B (zh) * 2003-09-12 2010-09-01 里特机械公司 并条-头道粗纱联合机和用于从纤维组中制造粗纱的方法
EP2112258B1 (de) * 2008-04-25 2016-05-11 Maschinenfabrik Rieter Ag Vorrichtung und Verfahren zum Aufwinden eines Vorgarnes auf eine Spule
JP5797116B2 (ja) * 2012-01-05 2015-10-21 日特エンジニアリング株式会社 スプールに巻回された線材の緩み防止装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB946240A (en) * 1960-06-01 1964-01-08 Tmm Research Ltd Improvements in speed frames and like textile machines
EP0134195A1 (en) * 1983-08-02 1985-03-13 Howa Kogyo Kabushiki Kaisha Apparatus for controlling the winding speed of roving in roving frame
JPS6285036A (ja) * 1985-10-09 1987-04-18 Toyoda Autom Loom Works Ltd 粗紡機の粗糸巻取り張力の制御方法
JPS62299521A (ja) * 1987-05-29 1987-12-26 Toyota Autom Loom Works Ltd 粗紡機の粗糸巻取張力制御装置
US5774940A (en) * 1996-07-19 1998-07-07 North Carolina State University Draftless sliver coiler packaging system for automated textile drafting system
EP1009870A1 (de) * 1997-09-01 2000-06-21 Maschinenfabrik Rieter Ag Reguliertes streckwerk
US20080070772A1 (en) * 2004-06-22 2008-03-20 Yasuhisa Mizuno Folding Device and Printing System

Also Published As

Publication number Publication date
CN108085797A (zh) 2018-05-29
CZ307263B6 (cs) 2018-05-02
CZ2016721A3 (cs) 2018-05-02

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