EP0547003A1 - Système pour la détection de tension de fils de trame dans un métier à tisser - Google Patents

Système pour la détection de tension de fils de trame dans un métier à tisser Download PDF

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Publication number
EP0547003A1
EP0547003A1 EP92811001A EP92811001A EP0547003A1 EP 0547003 A1 EP0547003 A1 EP 0547003A1 EP 92811001 A EP92811001 A EP 92811001A EP 92811001 A EP92811001 A EP 92811001A EP 0547003 A1 EP0547003 A1 EP 0547003A1
Authority
EP
European Patent Office
Prior art keywords
tension
lever
warp
easing
displacement
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Withdrawn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
EP92811001A
Other languages
German (de)
English (en)
Inventor
Hiroshi C/O Kabushiki Kaisha Toyoda Honda
Osamu c/o KABUSHIKI KAISHA TOYODA Fukumura
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.)
Toyota Industries Corp
Original Assignee
Toyoda Jidoshokki Seisakusho KK
Toyoda Automatic Loom Works Ltd
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 Toyoda Jidoshokki Seisakusho KK, Toyoda Automatic Loom Works Ltd filed Critical Toyoda Jidoshokki Seisakusho KK
Publication of EP0547003A1 publication Critical patent/EP0547003A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • D03D49/12—Controlling warp tension by means other than let-off mechanisms
    • 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
    • D03D49/18—Devices for indicating warp tension

Definitions

  • the present invention relates to a warp tension detecting system for a loom.
  • Warp tension detecting systems for a loom, with which the present invention is concerned, are disclosed in Japanese Utility Model Laid-open (Kokai) No. Sho 59-123180 and Japanese Patent Laid-open (Kokai) No. Sho 61-186553.
  • the prior art warp tension detecting system disclosed in Japanese Utility Model Laid-open (Kokai) No. Sho 59-123180 has a tension roller for guiding warp yarns unwound from a warp beam is supported for swing motion on the frame of a loom by easing springs.
  • the displacement of the tension roller causes the strain of the easing spring to change, and the change of the strain of the easing spring is detected by a load detector connected to the easing spring in a tandem arrangement.
  • a modification of the warp tension detecting system disclosed in the above gazette employs a displacement transmitting lever having one end on which a tension roller is supported and the other end connected through an easing spring and a load detector to a fixed member. In this modification, the displacement of the tension roller causes the strain of the easing spring to change, and the change of the strain of the easing spring is detected by the load detector.
  • the easing spring of the prior art warp tension detecting system disclosed in Japanese Utility Model Laid-open (Kokai) No. Sho 59-123180 undergoes the direct action of the warp tension. Therefore, the easing spring must have a large spring constant to deal with the variable tension of the warp yarns that varies in a wide tension range during weaving operation.
  • An easing spring having a large spring constant is not satisfactory in characteristics for responding to the variation of the warp tension, particularly, when the warp tension varies in a low tension range. Since the overall length of the tandem arrangement of the easing spring and the load detector connected to the easing spring is relatively large, it is difficult to accommodate the easing spring and the load detector in a limited space.
  • the prior art warp tension detecting system employing the displacement transmitting lever disclosed in Japanese Utility Model Laid-open (Kokai) No. Sho.59-123180 is able to employ an easing spring having a relatively small spring constant if the leverage of the displacement transmitting lever, namely, the ratio of the length of one of the arms, connected to the easing spring to the length of the other arm supporting the tension roller, is relatively large.
  • Increase in the leverage of the displacement transmitting lever entails necessarily increase in the size of the displacement transmitting lever.
  • increase in the size of the displacement transmitting lever is limited by the space for accommodating the displacement transmitting lever. Even if a displacement transmitting lever of a large leverage is employed, it is difficult to connect the easing spring and the load detector in a tandem arrangement. Such an improvement requires inevitably the projection of a portion of the displacement transmitting lever, the easing spring or the load detector from the frame of a cover of the loom entailing increase in the overall size of the loom.
  • the present invention has been made in view of the foregoing problems and it is therefore an object of the present invention to provide a warp tension detecting system capable of employing a large displacement multiplying lever having a large leverage without increasing the size of the loom and of surely operating for easing motion even if the warp tension varies in a low tension range.
  • the present invention provides a warp tension detecting system for a loom, comprising: a tension roller for guiding warp yarn unwound from a warp beam and for detecting the tension of the warp yarns; displacement multiplying levers supporting the tension roller so as to multiply the displacement of the tension roller; loading levers extended respectively along the displacement multiplying levers; easing springs each disposed between the displacement multiplying lever and the corresponding loading lever so as to be strained by the displacement multiplying lever and to apply a load corresponding to the strain thereof to the loading lever; and load detectors each disposed in parallel to the easing spring and connected to the loading lever to detect a load corresponding to the strain of the easing spring. (O 0 1 01
  • the easing spring and the load detector are connected to the loading lever in a parallel arrangement, the easing spring and the load detector can be disposed in a relatively small space smaller than that necessary for disposing the easing spring and the load detector connected to the easing spring in a tandem arrangement. Therefore, the relatively large displacement multiplying lever can be used without increasing the overall size of the loom, and the relatively large displacement multiplying lever ensures satisfactory easing motion when the warp tension varies in a low tension range.
  • FIG. 1 to 3 illustrate the following:
  • a warp tension detecting system in a preferred embodiment according to the present invention will be described hereinafter with reference to Figs. 1 and 2.
  • a pair of side frames 1A and 1B are covered, respectively, with covers 2A and 2B.
  • Beam support frames 3A and 3B fixedly provided with holding members 4A and 4B are attached to the respective lower portions of the side frames 1A and 1B respectively.
  • a warp beam 5 formed by winding warp yarns T on a beam 5a is extended across and supported for rotation on the holding members 4A and 4B.
  • the warp yarns T unwound from the warp beam 5 are guided toward the front of the loom through a back roller 6 and a tension roller 7, which serves as a tension detecting roller.
  • a pair of back brackets 8A and 8B are attached to the respective rear upper portions of the side frames 1A and 1B, respectively.
  • Second back brackets 9A and 9B are joined to the respective inner surfaces of the back brackets 8A and 8B so as to be vertically slidable along the inner surfaces of the back brackets 8A and 8B, respectively.
  • the respective vertical positions of the second back brackets 9A and 9B are adjustable. Adjusting bolts 11A and 11B are screwed through threaded holes formed in the upper flanges 10A and 10B of the second back brackets 9A and 9B so that the extremities thereof are in contact with the back brackets 8A and 8B, and locked in place with locking nuts 12A and 12B, respectively.
  • the respective vertical positions of the second back brackets 9A and 9B are adjusted by turning the adjusting bolts 11A and 11B, respectively.
  • the shaft 6a of the back roller 6 is journaled at a fixed position on the second back brackets 9A and 9B.
  • a pair of tension levers 13A and 13B are fixed to the shaft 6a, and the shaft 7a of the tension roller 7 is journaled on the tension levers 13A and 13B
  • the tension levers 13A and 13B supporting the tension roller 7 is swingable together with the shaft 6a about the axis of the shaft 6a.
  • the shaft 7a is supported for rotation in bearings 20A and 20B on the tension levers 13A and 13B, so that the tension roller 7 is able to rotate on the tension levers 13A and 13B.
  • the shaft 6a is supported in bearings 19A and 19B fitted in the back roller 6, so that the back roller 6 is able to rotate on the shaft 6a.
  • Displacement multiplying levers 14A and 14B are fixedly suspended from the opposite ends of the shaft 6a within the second back brackets 9A and 9B, respectively.
  • Detecting levers 15A and 15B are pivoted on the inner surface of the second back brackets 9A and 9B so as to extend along the displacement multiplying levers 14A and 14B, respectively.
  • Easing springs 16A and 16B are extended between the respective free ends of the displacement multiplying lever 14A and the loading lever 15A and between the displacement multiplying lever 14B and the loading lever 15B, respectively.
  • a load cell support bracket 17A is fixed to the lower surface of the second back bracket 9A, and a load cell 18A, i.e., a load detector, is disposed between the load cell support bracket 17A and a portion of the loading lever 15A between the opposite ends of the same in parallel to the easing spring 16A.
  • the load cell 18A has one end fastened to the load cell support bracket 17A with a bolt 21A and the other end fastened to the loading lever 15A with a bolt 21A.
  • the displacement multiplying levers 14A and 14B are biased toward the rear end of the loom, namely, counterclockwise as viewed in Fig. 2, by the pulling action of the easing springs 16A and 16B.
  • the resilient forces of the easing springs 16A and 16B are applied through the tension roller 7 to the warp yarns T.
  • the tension of the warp yarns T varies regularly in each weaving cycle due to shedding motion and beating motion.
  • the regular variation of the tension of the warp yarns T is absorbed by the easing springs 16A and 16B.
  • the tension roller 7 is pulled toward the front of the loom by the warp yarns T when the tension of the warp yarns T increases, and the tension roller 7 is allowed to move away from the rear end of the loom.
  • the displacement of the tension roller 7 according to the variation of the tension of the warp yarns T causes the tension levers 13A and 13B to swing accordingly, and the swing motion of the tension levers 14A and 14B are transmitted, respectively, to the displacement multiplying levers 14A and 14B.
  • the strain of the easing spring 16A changes according to the swing motion of the displacement multiplying lever 14A and a load proportional to the strain of the easing spring 16A is applied through the loading lever 15A to the load cell 18A.
  • a let-off motor is controlled according to the tension of the warp yarns T detected by the load cell 18A to regulate the rate of unwinding the warp yarns T from the warp beam so as to maintain the warp yarns T substantially at constant tension.
  • the easing springs 16A and 16B may be such as having a relatively small spring constant.
  • the easing springs 16A and 16B having a relatively small spring constant have excellent response characteristics in responding to the variation of the tension of the warp yarns T and are capable of surely absorbing tension variation when the tension of the warp yarns T is relatively low as well as when the tension of the same is relatively high. Accordingly, a fabric of fine yarns requiring easing action on a low tension level, such as delicate fine filament yarns, can be woven in a high quality on the loom.
  • the space necessary for disposing the easing springs 16A and 16B and the load cell 18A is smaller than that necessary for disposing the easing spring and the load cell connected in a tandem arrangement of the prior art warp tension detecting system, and the easing spring 16A and the load cell 18A, and the easing spring 16B can be accommodated in a space between the lower surface of the second back bracket 9A and the upper surface of the beam support frame 3A, and a space between the lower surface of the second back bracket 9B and the upper surface of the beam support frame 3B, respectively.
  • the easing springs 16A and 16B, the load cell 18A, and the displacement multiplying levers 14B and 14B do not touch the side frames 1A and 1B of the loom and do not project from the covers 2A and 2B, so that the overall size of the loom is not increased and the appearance of the loom is not spoiled.
  • the load f on the load cell is dependent on the ratio S1/S2, namely, the leverage of the displacement multiplying lever.
  • the distance between the center axis of the shaft supporting the loading lever 15A and the position on the loading lever 15A at which the load cell 18A is joined to the loading lever 15A is Ll
  • the distance between the center axis of the shaft supporting the loading lever 15A (15B) and the position on the loading lever 15A (15B) at which the easing spring 16A (16B) is joined to the loading lever 15A (15B) is L2
  • the load f on the load cell 18A can be adjusted by changing either the leverage S1/S2 Of the displacement multiplying lever 14A or the leverage L1/L2 of the loading lever 15A; that is, since the positions on the displacement multiplying levers 14A and 14B where the easing springs 16A and 16B are joined to the displacement multiplying levers 14A and 14B, and the position on the loading lever 15A where the load cell 18A is joined to the loading lever 15A can be independently be determined, the load f to be applied to the load cell 18A can be adjusted by properly changing either the positions on the displacement multiplying levers 14A and 14B where the easing springs 16A and 16B are joined to the displacement multiplying levers 14A and 14B or the position on the loading lever 15A where the load cell 18A is joined to the loading lever 15A.
  • the geometry of the warp tension detecting system can be easily determined so that the load f to be applied to the load cell 18A will vary within the range of rated characteristics of the load cell 18A, namely, the range in which the output of the load cell 18A varies linearly with the load. Even if the warp tension is increased greatly when a fabric of a design being woven on the loom is changed for another fabric of another design, for example, when a fabric of a plane weave being woven on the loom is changed for a fabric of a satin weave, the geometry of the warp tension detecting system can be readily changed so that the range of variation of the load f on the load cell 18A will remain unchanged.
  • the rating of the load cell must be equal to a possible maximum load, to enable appropriate easing motion. For example, when the warp tension is increased greatly when changing a fabric of a design being woven on the loom for another fabric of another design, for example, when changing a fabric of a plane weave being woven on the loom for a fabric of a satin weave, it is possible that the load on the load cell is increased several times. Therefore, the rating of the load cell must be determined on the basis of the expected range of variation of the warp tension. The change of the rating of the load cell is troublesome, which is an impediment to the application of the load cell to general purposes.
  • the rating of the load cell 18A need not be changed and the load cell 18A can be used under various different weaving conditions.
  • Figs 3 shows another mechanism for adjusting the load f to be applied to the load cell 18A.
  • the loading lever 15A is provided with a vertical positioning slot 30, the bolt 21A is slidable in the positioning slot 30, one end of the load cell 18A is fastened by the bolt 21A and a nut, not shown, to the loading lever 15A, and the other end of the load cell 18A is fastened by the bolt 21A and a nut, not shown, to the load cell support bracket 17A.
  • the position of the bolt 21A in the positioning slot 30 is changed to adjust the load f to be applied to the load cell 18A.
  • the load cell may be disposed beside or under the easing spring 16A.
  • the warp tension detecting system in the foregoing embodiment provided with the pair of easing springs 16A and 16B is suitable particularly for application to broad looms.
  • the warp tension detecting system may be provided with only a single easing spring.
  • the present invention provides a warp tension detecting system capable of employing displacement multiplying levers having a relatively large size and a relatively large leverage without increasing the size of the associated loom and of ensuring satisfactory easing motion.
  • a warp tension detecting system comprises: a tension roller 7 for guiding warp yarns T and for detecting the tension of the warp yarns T; displacement multiplying levers 14A, 14B supporting the tension roller 7; loading levers 15A, 15B extended respectively along the displacement multiplying levers 14A, 14B; easing springs 16A, 16B each disposed between the displacement multiplying lever and the corresponding loading lever so as to be strained by the displacement multiplying lever and to apply a load corresponding to the strain thereof to the loading lever; and a load cell 18A disposed in parallel to the easing spring 16A, 16B. The load applied to the loading lever 15A is detected by the load cell 18A.
  • the displacement multiplying lever can be disposed without increasing the overall size of the loom even if the displacement multiplying lever is of a relatively large size.
  • the displacement multiplying lever having a relatively large size and a relatively large leverage ensures satisfactory easing motion even if the warp tension is relatively low.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
EP92811001A 1991-12-13 1992-12-14 Système pour la détection de tension de fils de trame dans un métier à tisser Withdrawn EP0547003A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP103187/91U 1991-12-13
JP1991103187U JP2534202Y2 (ja) 1991-12-13 1991-12-13 織機における経糸張力検出装置

Publications (1)

Publication Number Publication Date
EP0547003A1 true EP0547003A1 (fr) 1993-06-16

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EP92811001A Withdrawn EP0547003A1 (fr) 1991-12-13 1992-12-14 Système pour la détection de tension de fils de trame dans un métier à tisser

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0707103A3 (fr) * 1994-07-30 1996-07-24 Dornier Gmbh Lindauer Dispositif de tension de la chaîne pour metier à tisser
EP0771896A1 (fr) * 1995-10-13 1997-05-07 Lindauer Dornier Gesellschaft M.B.H Dispositif non commandé de tension de la chaîne d'un métier à tisser
EP0789097A1 (fr) * 1996-02-05 1997-08-13 Sulzer RàœTi Ag Procédé et dispositif pour mesurer la tension de la chaîne dans un métier à tisser
US6135162A (en) * 1997-09-13 2000-10-24 Lindauer Dornier Gesellschaft Mbh Method and device for regulating a back rest and/or a drop wire position of a weaving machine
EP1445363A3 (fr) * 2003-02-04 2005-01-12 Promatech S.p.A. Arrangement du porte-fils dans un métier à tisser
EP1544338A3 (fr) * 2003-02-19 2006-04-05 Kabushiki Kaisha Toyota Jidoshokki Dispositif de détection de tension de la chaîne pour métier à tisser
EP1878821A1 (fr) * 2006-07-11 2008-01-16 Tsudakoma Kogyo Kabushiki Kaisha Dispositif de soutien de cylindre d'un métier à tisser
EP2184390A1 (fr) * 2008-11-10 2010-05-12 Tsudakoma Kogyo Kabushiki Kaisha Dispositif de déroulage de fils de chaîne d'un métier à tisser utilisant un mécanisme positive de support pour le porte-fils
CN103061011A (zh) * 2011-10-19 2013-04-24 津田驹工业株式会社 织机的张力检测装置
WO2018073386A1 (fr) * 2016-10-20 2018-04-26 Lindauer Dornier Gesellschaft Mit Beschränkter Haftung Dispositif de mesure de la tension de chaine dans une machine à tisser et machine a tisser équipé d'un tel dispositif
CN120967574A (zh) * 2025-10-16 2025-11-18 苏州工学院 一种挠性剑杆织机送经传动机构

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3526252A (en) * 1968-09-04 1970-09-01 Hindle Son & Co Ltd Loom warp letting-off mechanism
EP0038025A2 (fr) * 1980-04-12 1981-10-21 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Dispositif pour le réglage de la tension des fils de chaîne dans un métier à tisser
DE3601279A1 (de) * 1985-02-14 1986-08-14 Aktiengesellschaft Adolph Saurer, Arbon Streichbaumanordnung an einer webmaschine
US4942908A (en) * 1988-03-29 1990-07-24 Nissan Motor Co., Ltd. Warp transfer control system of loom for filling density change
EP0456274A1 (fr) * 1990-05-11 1991-11-13 Tsudakoma Corporation Dispositif de contrôle de la tension de la chaîne

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3526252A (en) * 1968-09-04 1970-09-01 Hindle Son & Co Ltd Loom warp letting-off mechanism
EP0038025A2 (fr) * 1980-04-12 1981-10-21 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Dispositif pour le réglage de la tension des fils de chaîne dans un métier à tisser
DE3601279A1 (de) * 1985-02-14 1986-08-14 Aktiengesellschaft Adolph Saurer, Arbon Streichbaumanordnung an einer webmaschine
US4942908A (en) * 1988-03-29 1990-07-24 Nissan Motor Co., Ltd. Warp transfer control system of loom for filling density change
EP0456274A1 (fr) * 1990-05-11 1991-11-13 Tsudakoma Corporation Dispositif de contrôle de la tension de la chaîne

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0707103A3 (fr) * 1994-07-30 1996-07-24 Dornier Gmbh Lindauer Dispositif de tension de la chaîne pour metier à tisser
EP0771896A1 (fr) * 1995-10-13 1997-05-07 Lindauer Dornier Gesellschaft M.B.H Dispositif non commandé de tension de la chaîne d'un métier à tisser
US5755268A (en) * 1995-10-13 1998-05-26 Lindauer Dornier Gesellschaft Mbh Loom warp tensioning device with torque moment compensation
EP0789097A1 (fr) * 1996-02-05 1997-08-13 Sulzer RàœTi Ag Procédé et dispositif pour mesurer la tension de la chaîne dans un métier à tisser
US5827975A (en) * 1996-02-05 1998-10-27 Sulzer Rueti Ag Method and apparatus for measuring the tension of the warp in a weaving machine
US6135162A (en) * 1997-09-13 2000-10-24 Lindauer Dornier Gesellschaft Mbh Method and device for regulating a back rest and/or a drop wire position of a weaving machine
EP1445363A3 (fr) * 2003-02-04 2005-01-12 Promatech S.p.A. Arrangement du porte-fils dans un métier à tisser
EP1544338A3 (fr) * 2003-02-19 2006-04-05 Kabushiki Kaisha Toyota Jidoshokki Dispositif de détection de tension de la chaîne pour métier à tisser
CN1306088C (zh) * 2003-02-19 2007-03-21 株式会社丰田自动织机 一种织机的经纱张力检测机构
CN101104976B (zh) * 2006-07-11 2012-05-30 津田驹工业株式会社 织机滚筒支撑装置
EP1878821A1 (fr) * 2006-07-11 2008-01-16 Tsudakoma Kogyo Kabushiki Kaisha Dispositif de soutien de cylindre d'un métier à tisser
EP2184390A1 (fr) * 2008-11-10 2010-05-12 Tsudakoma Kogyo Kabushiki Kaisha Dispositif de déroulage de fils de chaîne d'un métier à tisser utilisant un mécanisme positive de support pour le porte-fils
CN101736497B (zh) * 2008-11-10 2014-02-19 津田驹工业株式会社 具有积极松经机构的织机的送经装置
CN103061011A (zh) * 2011-10-19 2013-04-24 津田驹工业株式会社 织机的张力检测装置
EP2584079A3 (fr) * 2011-10-19 2013-11-13 Tsudakoma Kogyo Kabushiki Kaisha Appareil de détection de tension pour métier à tisser
CN103061011B (zh) * 2011-10-19 2015-05-27 津田驹工业株式会社 织机的张力检测装置
WO2018073386A1 (fr) * 2016-10-20 2018-04-26 Lindauer Dornier Gesellschaft Mit Beschränkter Haftung Dispositif de mesure de la tension de chaine dans une machine à tisser et machine a tisser équipé d'un tel dispositif
CN109844198A (zh) * 2016-10-20 2019-06-04 林道尔·多尼尔有限责任公司 用于测量织机中经纱张力的设备和带有这种设备的织机
CN109844198B (zh) * 2016-10-20 2020-10-23 林道尔·多尼尔有限责任公司 用于测量织机中经纱张力的测量设备和带有这种测量设备的织机
CN120967574A (zh) * 2025-10-16 2025-11-18 苏州工学院 一种挠性剑杆织机送经传动机构

Also Published As

Publication number Publication date
JPH0551988U (ja) 1993-07-09
JP2534202Y2 (ja) 1997-04-30

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