US3878872A - Warp let-off means - Google Patents

Warp let-off means Download PDF

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Publication number
US3878872A
US3878872A US401277A US40127773A US3878872A US 3878872 A US3878872 A US 3878872A US 401277 A US401277 A US 401277A US 40127773 A US40127773 A US 40127773A US 3878872 A US3878872 A US 3878872A
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United States
Prior art keywords
warp
cloth
feed roller
roller
tension
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Expired - Lifetime
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US401277A
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English (en)
Inventor
Otto Hintsch
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Sulzer AG
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Sulzer AG
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Publication date
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Publication of US3878872A publication Critical patent/US3878872A/en
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/04—Control of the tension in warp or cloth
    • D03D49/06—Warp let-off mechanisms

Definitions

  • the speed of the motor is regu- 139/3041 31] lated by signals obtained from a pressure sensor on the breast beam which sensor measures the pressure of [56] References cued the produced cloth on the breast beam.
  • the control UNITED STATES PATENTS signals can also be obtained from a measurement of 359 13 5 1953 H 139 X the rate of cloth draw-off.
  • a torque 4,072154 M963 Locher v a 11 l39/l 1U pick-off can be used to measure cloth tension in order 1.125.127 3/1964 Locher 1 a i. 139/97 to produce the control signal for the control motor.
  • This invention relates to a warp let-off means and particularly a warp let-off means for a weaving machine.
  • the invention provides a weaving machine having a warp feed roller with a warp let-off means for driving the feed roller.
  • the let-off means includes a warp tension control circuit having a control element for controlling the speed of the feed roller in dependence upon warp tension in the machine.
  • the control element constitutes a motor which drives the feed roller.
  • the capability of being able to control warp tension accurately is particularly important in the weaving of very wide fabrics involving the use of two or more warp beams. for although warp beam radii are never exactly the same. the tensions of the individual warps must be not only constant but also equal to one another.
  • the variable for the control circuit is derived from a pressure sensor which is disposed on the breast beam of the weaving machine and which produces a control signal corresponding to warp tension.
  • the pressure sensor can be a strain gauge which is secured to the breast beam to measure the sag of the beam as a measure of cloth tension and therefore warp tension.
  • Another possibility is for the variable to be produced by a torque pick-off coupled with the cloth draw-off roller.
  • the speed of the cloth draw-off can be used as the variable signal for the control circuit.
  • FIGURE diagrammatically illustrates a weaving machine having a warp let-off means according to the invention.
  • the weaving machine comprises a warp beam 1 having a warp 2.
  • the beam l is braked continuously by means of a brake drum 4 and a cable or rope 5 which extends therearound and which has a weight 6.
  • the warp passes around a deflecting roller 7 and a feed roller 8 associated with a back-up roller 9.
  • the feed roller 8 has a friction-increasing covering and serves to feed the warp yarns into the machine to form a shed 10.
  • the finished cloth ll goes to. and is wound on, a cloth beam (not shown) by way of a breast beam 12, cloth drawoff roller or stepping beam 13 and a deflecting roller 14.
  • the roller I3 is connected to a drive device l5 (shown in diagrammatic form).
  • the feed roller Sis connected to a warp let-off means which includes a drive system comprising a worm 20. wormwheel 21 and. secured to the roller 8, a gear wheel 22.
  • the worm 20 is secured to a drive shaft 23 of a control element or regulating motor 24 whose speed is controlled in dependence upon warp tension by an electronic control circuit to be described hereinafter.
  • a pressure sensor or transducer 30 Disposed on the breast beam 12 is a pressure sensor or transducer 30 which provides a continuous measure ment of the pressure of the cloth H on the breast beam 12. Since such pressure corresponds to the tension of the finished cloth and such tension is identical to the warp tension. the sensor 30 produces a control signal L; which corresponds to warp tension and will therefore be referred to hereinafter as the warp tension signal.
  • Warp tension signal .v,. is compared in a comparator 3
  • the speed of the motor 24 and. therefore. the speed of roller 8 i.e.. the quantity of warp let off the warp beam 1. and therefore warp tension. are controlled in dependence upon the value Y.
  • the sensor 30 can be. e.g.. an electric load cell or a strain gauge secured to the breast beam l2 for measuring a signal corresponding the breast beam sag due to cloth tension.
  • the advantage of placing the pressure sensor 30 on the breast beam I2 is that if more than one warp beam is used. warp tension can be detected at the same place.
  • the control circuit also comprises a deviation sensor 33 which is directly coupled with the cloth draw-off roller drive device 15.
  • the reason for detecting the deviation of the cloth take off speed in this way is as follows:
  • Warp consumption per unit oftime i.e.. the length of warp let offa warp beam per unit of time. of a weaving machine is determined with reference to cloth parameters. such as the fineness of the warp yarns and the material of which they are made. and can be considered to be constant for a given cloth density (number of wefts per centimeter (cm) of cloth length). Consequently. the rate of cloth draw-off determines feed roller speed and hence warp consumption and hence warp tension, assuming that the warp is worked in a particular way [warp working depends upon warp density (number of warp yarns per centimeter) cloth texture. warp tension and yarn number].
  • the speed of cloth draw off can therefore be supplied to the control circuit as the control value i.e. disturbance variable. for warp tension.
  • the sensor 33 emits a constant variable signal Z which corresponds to warp tension. After processing in a deviation sensor 34. the signal Z is supplied to the controller 32 and contributes. according to its value. to determining the final control value Y for the motor 24.
  • the command variable i.e.. the set value for a particular setting. is cloth tension.
  • the set value can be ad justed to the selected cloth tension by means of a potentiometer.
  • a torque pick-off 35 coupled with the cloth draw-off roller 13 can be used.
  • the pick-off 35 produces a signal .t',. corresponding to the cloth tension (which is the same as the warp tension such signal going via line 36 to the comparator 31.
  • the motor 24 is a stepping motor ensuring accurate speed control of feed roller 8. If required, however. the motor 24 can be a steplessly variable threephase motor.
  • the warp let-off means according to the invention although described herein for use with a weaving machine, is, of course. capable of use for other textile machinery having one or more warp beams. Also. a control circuit of some other kind than the electronic control circuit herein described. cg. a pneumatic or hydraulic control circuit. can be used.
  • a warp let off means for driving said feed roller including an electronic warp tension control circuit having a control element for controiling the speed of said feed roller in dependence upon warp tension in said machine and a pressure sensor disposed on said breast beam for producing a control signal corresponding to warp tension in response to the pressure of the cloth on said breast beam for emission to said control element.
  • a weaving machine as set forth in claim I further having a cloth take-off roller wherein said control circuit includes means for determining the speed of said dravv off roller as a measure of warp tension for com trolling said control element.
  • a weaving machine having a feed roller for feeding warp yarns into a shed. a breast beam downstream of said shed for passage of a produced cloth thereover and a cloth draw-off roller; :1 warp let-off means for driving said feed roller including an electronic warp tension control circuit having a control element for controlling the speed of said feed roller in dependence upon warp tension in said machine and a torque pickoff coupled to said draw-off roller to emit a control signal corresponding to warp tension to said control element.
  • Warp let-off apparatus for a weaving machine comprising a feed roller for feeding warp yarn from a warp beam into a shed;
  • driving means for driving said feed roller
  • a pressure transducer disposed on said breast beam to cause said control circuit to produce a control signal corresponding to warp tension in response to pressure of the cloth on said breast beam for controlling said drive means.
  • Warp let-off apparatus as set forth in claim 7 wherein said pressure transducer is a strain gauge secured to said breast beam.
  • Warp let-off apparatus for a weaving machine comprising a feed roller for feeding warp yarn from a warp beam into a shed;
  • driving means for driving said feed roller
  • a torque pick-off coupled to said draw-off roller to cause said control circuit to produce a control signal corresponding to warp tension for controlling said drive means.
  • Warp let-off apparatus as set forth in claim 9 wherein said control circuit further includes means for sensing the speed of said draw-off roller to emit a signal representing the disturbance variable for the warp tension for introduction into said control circuit.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US401277A 1972-09-29 1973-09-27 Warp let-off means Expired - Lifetime US3878872A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1429472A CH556416A (de) 1972-09-29 1972-09-29 Kettablassvorrichtung.

Publications (1)

Publication Number Publication Date
US3878872A true US3878872A (en) 1975-04-22

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Family Applications (1)

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US401277A Expired - Lifetime US3878872A (en) 1972-09-29 1973-09-27 Warp let-off means

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US (1) US3878872A (US06653308-20031125-C00199.png)
JP (1) JPS5133222B2 (US06653308-20031125-C00199.png)
AT (1) AT322467B (US06653308-20031125-C00199.png)
CH (1) CH556416A (US06653308-20031125-C00199.png)
CS (1) CS175464B2 (US06653308-20031125-C00199.png)
DE (1) DE2248558A1 (US06653308-20031125-C00199.png)
FR (1) FR2201361B1 (US06653308-20031125-C00199.png)
GB (1) GB1446573A (US06653308-20031125-C00199.png)
IT (1) IT995516B (US06653308-20031125-C00199.png)
SU (1) SU485604A3 (US06653308-20031125-C00199.png)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2365647A1 (fr) * 1976-09-27 1978-04-21 Sulzer Ag Dispositif de commande du deroulement de la chaine d'une machine a tisser
US4125131A (en) * 1976-09-21 1978-11-14 Adolph Saurer Fixed driving connection between a guide roller and delivery roller of a loom
US4129154A (en) * 1975-08-08 1978-12-12 Bennelli Dore D Electronic device for controlling the winding off of material wound up on a core by tensiometric control
US4402347A (en) * 1980-04-03 1983-09-06 Vyzkumny A Vyvojovy Ustav Zavodu Vseobecneho Strojirenstvi Warp let-off and its drive in a loom
US4513790A (en) * 1983-02-25 1985-04-30 Tsudakoma Corp. Method and apparatus for controlling motor-driven let-off motion for looms
US4529012A (en) * 1983-02-16 1985-07-16 Tsudakoma Corp. Apparatus for controlling motor-driven let-off motion for looms
US4572243A (en) * 1982-07-13 1986-02-25 Zellweger Uster Ltd. System and apparatus for the measurement of the tension of textile fabrics in textile machines
US4619294A (en) * 1984-01-20 1986-10-28 Tsudakoma Corp. Method of and apparatus for controlling motor-driven let-off and take-up system for looms
US4628967A (en) * 1984-08-24 1986-12-16 Aktiengesellschaft Adolph Saurer Cloth draw-off apparatus for a weaving machine
EP0208366A2 (en) * 1985-07-12 1987-01-14 Picanol N.V. Process for regulation of the location of the so-called cloth line, breast beam, and breast beam drive used with it, in weaving machines
US4817677A (en) * 1986-08-22 1989-04-04 Picanol N.V. Method for controlling the warp let-off and cloth take-up on weaving machines
US5025837A (en) * 1989-02-25 1991-06-25 Lindauer Dornier Gesellschaft Mbh Apparatus for measuring loom warp tension
US5355912A (en) * 1992-10-01 1994-10-18 Nuovopignone-Industrie Meccaniche E Fonderia Spa Elastic deformation device for automatically controlling the warp tension in a loom
US5386855A (en) * 1992-10-23 1995-02-07 Nuovopignone-Industrie Meccaniche E Fonderia Spa Device for automatically varying the position of the shed vertex in a loom
US5628346A (en) * 1994-02-18 1997-05-13 Nuovo Pignone S.P.A. Device for measuring the warp yarn tension in a loom by use of a deviation bar
US20110000576A1 (en) * 2007-09-05 2011-01-06 Toshiba Kikai Kabushiki Kaisha Loom and drive device of loom
CN102251340A (zh) * 2010-05-21 2011-11-23 津田驹工业株式会社 具备具有边撑位置自动切换机构的边撑装置的织机的送出控制方法及装置
CN102277677A (zh) * 2011-07-14 2011-12-14 西安工程大学 送经自适应变速调速装置及其调速方法
US20160281278A1 (en) * 2013-11-07 2016-09-29 Lindauer Dornier Gesellschaft Mit Beschränkter Haftung Method and Device for Measuring the Fabric Tension in a Weaving Machine
WO2022011320A1 (en) * 2020-07-09 2022-01-13 University Of Hawai'i Continuous production of nanoforests
CN117328200A (zh) * 2023-11-30 2024-01-02 江苏友诚数控科技有限公司 一种平绒喷气织机机构

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH609386A5 (US06653308-20031125-C00199.png) * 1976-01-20 1979-02-28 Rueti Ag Maschf
JPS5410525U (US06653308-20031125-C00199.png) * 1977-06-24 1979-01-24
JPS551329A (en) * 1978-06-16 1980-01-08 Nissan Motor Weaving density controlling apparatus of loom
JPS5841271B2 (ja) * 1978-11-29 1983-09-10 宗一 鳥居 糸の張力調整送り装置
JPS59157355A (ja) * 1983-02-28 1984-09-06 株式会社豊田自動織機製作所 織機の運転開始方法
CH661754A5 (de) * 1983-10-04 1987-08-14 Saurer Ag Adolph Regeleinrichtung fuer den drehantrieb einer abwickelvorrichtung.
JPS60181349A (ja) * 1984-02-24 1985-09-17 津田駒工業株式会社 織機の巻取り制御装置
EP0717135B1 (de) * 1994-12-13 2010-06-16 ITEMA (Switzerland) Ltd. Vorrichtung zur Messung der Kettspannung an einer Webmaschine
JPH0967739A (ja) * 1995-08-24 1997-03-11 Urase:Kk たて糸送出装置
CN102493107A (zh) * 2011-12-13 2012-06-13 武汉纺织大学 一种经纱分层的织造方法
CN112481775A (zh) * 2020-12-07 2021-03-12 中国科学院宁波材料技术与工程研究所 一种三维织机的主动送经装置及方法

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2597136A (en) * 1947-02-21 1952-05-20 Westinghouse Electric Corp Electronic motor control
US3072154A (en) * 1958-10-22 1963-01-08 Zellweger Uster Ag Method and device for electrically controlling the warp tension in looms for weaving
US3125127A (en) * 1964-03-17 Locher
US3308854A (en) * 1963-01-22 1967-03-14 Sulzer Ag Loom for weaving
US3364403A (en) * 1963-11-07 1968-01-16 Jean Gusken Maschinenfabrik Ei Motor control for maintaining the tension of positively pulled warp threads in warp looms
US3417791A (en) * 1966-03-28 1968-12-24 Saurer Ag Adolph Warp beam take-off drive
US3706328A (en) * 1969-09-05 1972-12-19 Elitex Zavody Textilniho Device for the continuous and automatically controlled driving of warp beams and similar devices bearing a yarn supply
US3753452A (en) * 1971-04-22 1973-08-21 United Merchants & Mfg Potential-energy torque-generating mechanism for operating a take-up roll
US3828827A (en) * 1972-07-31 1974-08-13 Uniroyal Inc Manufacture of woven wire tire cord fabric

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CS148506B1 (US06653308-20031125-C00199.png) * 1970-04-28 1973-02-22
FR2119285A5 (US06653308-20031125-C00199.png) * 1970-12-24 1972-08-04 Fatex
BE768521R (nl) * 1971-02-26 1971-11-03 Weefautomaten Picanol N V Meti Kettingafwinder voor
BE763488A (nl) * 1971-02-26 1971-07-16 Picanol Nv Kettingafwinder voor weefgetouwen.
FR2155852A1 (en) * 1971-10-11 1973-05-25 Inst Textile De France Loom cylinder speed control system - uses electronically driven stepping motor

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125127A (en) * 1964-03-17 Locher
US2597136A (en) * 1947-02-21 1952-05-20 Westinghouse Electric Corp Electronic motor control
US3072154A (en) * 1958-10-22 1963-01-08 Zellweger Uster Ag Method and device for electrically controlling the warp tension in looms for weaving
US3308854A (en) * 1963-01-22 1967-03-14 Sulzer Ag Loom for weaving
US3364403A (en) * 1963-11-07 1968-01-16 Jean Gusken Maschinenfabrik Ei Motor control for maintaining the tension of positively pulled warp threads in warp looms
US3417791A (en) * 1966-03-28 1968-12-24 Saurer Ag Adolph Warp beam take-off drive
US3706328A (en) * 1969-09-05 1972-12-19 Elitex Zavody Textilniho Device for the continuous and automatically controlled driving of warp beams and similar devices bearing a yarn supply
US3753452A (en) * 1971-04-22 1973-08-21 United Merchants & Mfg Potential-energy torque-generating mechanism for operating a take-up roll
US3828827A (en) * 1972-07-31 1974-08-13 Uniroyal Inc Manufacture of woven wire tire cord fabric

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4129154A (en) * 1975-08-08 1978-12-12 Bennelli Dore D Electronic device for controlling the winding off of material wound up on a core by tensiometric control
US4125131A (en) * 1976-09-21 1978-11-14 Adolph Saurer Fixed driving connection between a guide roller and delivery roller of a loom
FR2365647A1 (fr) * 1976-09-27 1978-04-21 Sulzer Ag Dispositif de commande du deroulement de la chaine d'une machine a tisser
US4122873A (en) * 1976-09-27 1978-10-31 Sulzer Brothers Limited Control means for controlling the warp let-off of a weaving machine
US4402347A (en) * 1980-04-03 1983-09-06 Vyzkumny A Vyvojovy Ustav Zavodu Vseobecneho Strojirenstvi Warp let-off and its drive in a loom
US4572243A (en) * 1982-07-13 1986-02-25 Zellweger Uster Ltd. System and apparatus for the measurement of the tension of textile fabrics in textile machines
US4529012A (en) * 1983-02-16 1985-07-16 Tsudakoma Corp. Apparatus for controlling motor-driven let-off motion for looms
US4513790A (en) * 1983-02-25 1985-04-30 Tsudakoma Corp. Method and apparatus for controlling motor-driven let-off motion for looms
US4619294A (en) * 1984-01-20 1986-10-28 Tsudakoma Corp. Method of and apparatus for controlling motor-driven let-off and take-up system for looms
US4628967A (en) * 1984-08-24 1986-12-16 Aktiengesellschaft Adolph Saurer Cloth draw-off apparatus for a weaving machine
EP0208366A2 (en) * 1985-07-12 1987-01-14 Picanol N.V. Process for regulation of the location of the so-called cloth line, breast beam, and breast beam drive used with it, in weaving machines
EP0208366A3 (en) * 1985-07-12 1989-02-08 Picanol N.V. Process for regulation of the location of the so-called cloth line, breast beam, and breast beam drive used with it, in weaving machines
US4817677A (en) * 1986-08-22 1989-04-04 Picanol N.V. Method for controlling the warp let-off and cloth take-up on weaving machines
US5025837A (en) * 1989-02-25 1991-06-25 Lindauer Dornier Gesellschaft Mbh Apparatus for measuring loom warp tension
US5355912A (en) * 1992-10-01 1994-10-18 Nuovopignone-Industrie Meccaniche E Fonderia Spa Elastic deformation device for automatically controlling the warp tension in a loom
US5386855A (en) * 1992-10-23 1995-02-07 Nuovopignone-Industrie Meccaniche E Fonderia Spa Device for automatically varying the position of the shed vertex in a loom
US5628346A (en) * 1994-02-18 1997-05-13 Nuovo Pignone S.P.A. Device for measuring the warp yarn tension in a loom by use of a deviation bar
CN1041951C (zh) * 1994-02-18 1999-02-03 新齿轮股份公司 测量织机经纱张力的改进装置
US8091589B2 (en) * 2007-09-05 2012-01-10 Toshiba Kikai Kabushiki Kaisha Loom and drive device of loom
US20110000576A1 (en) * 2007-09-05 2011-01-06 Toshiba Kikai Kabushiki Kaisha Loom and drive device of loom
CN102251340A (zh) * 2010-05-21 2011-11-23 津田驹工业株式会社 具备具有边撑位置自动切换机构的边撑装置的织机的送出控制方法及装置
CN102251340B (zh) * 2010-05-21 2014-04-02 津田驹工业株式会社 具备具有边撑位置自动切换机构的边撑装置的织机的送出控制方法及装置
CN102277677A (zh) * 2011-07-14 2011-12-14 西安工程大学 送经自适应变速调速装置及其调速方法
US20160281278A1 (en) * 2013-11-07 2016-09-29 Lindauer Dornier Gesellschaft Mit Beschränkter Haftung Method and Device for Measuring the Fabric Tension in a Weaving Machine
US9725834B2 (en) * 2013-11-07 2017-08-08 Lindauer Dornier Gmbh Method and device for measuring the fabric tension in a weaving machine
WO2022011320A1 (en) * 2020-07-09 2022-01-13 University Of Hawai'i Continuous production of nanoforests
US12060271B2 (en) 2020-07-09 2024-08-13 University Of Hawai'i Continuous production of nanoforests
CN117328200A (zh) * 2023-11-30 2024-01-02 江苏友诚数控科技有限公司 一种平绒喷气织机机构
CN117328200B (zh) * 2023-11-30 2024-03-01 江苏友诚数控科技有限公司 一种平绒喷气织机机构

Also Published As

Publication number Publication date
IT995516B (it) 1975-11-20
CS175464B2 (US06653308-20031125-C00199.png) 1977-05-31
DE2248558A1 (de) 1974-04-11
GB1446573A (en) 1976-08-18
CH556416A (de) 1974-11-29
AT322467B (de) 1975-05-26
SU485604A3 (ru) 1975-09-25
FR2201361A1 (US06653308-20031125-C00199.png) 1974-04-26
FR2201361B1 (US06653308-20031125-C00199.png) 1977-05-13
JPS5133222B2 (US06653308-20031125-C00199.png) 1976-09-18
JPS4971254A (US06653308-20031125-C00199.png) 1974-07-10

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