EP0458754B1 - Dispositif pour tendre les fils de chaîne dans un métier à tisser - Google Patents

Dispositif pour tendre les fils de chaîne dans un métier à tisser Download PDF

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Publication number
EP0458754B1
EP0458754B1 EP19910810396 EP91810396A EP0458754B1 EP 0458754 B1 EP0458754 B1 EP 0458754B1 EP 19910810396 EP19910810396 EP 19910810396 EP 91810396 A EP91810396 A EP 91810396A EP 0458754 B1 EP0458754 B1 EP 0458754B1
Authority
EP
European Patent Office
Prior art keywords
tensioning
warp
warp yarn
warp yarns
tension
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.)
Expired - Lifetime
Application number
EP19910810396
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German (de)
English (en)
Other versions
EP0458754A1 (fr
Inventor
Masami C/O K.K. Toyoda Shinbara
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 EP0458754A1 publication Critical patent/EP0458754A1/fr
Application granted granted Critical
Publication of EP0458754B1 publication Critical patent/EP0458754B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D03D49/12—Controlling warp tension by means other than let-off mechanisms

Definitions

  • the present invention relates to a device for applying tension to opposite lateral ends of a sheet of warp yarns in a weaving loom.
  • the tension of warp yarns arranged in a array or a sheet in a weaving loom differs between the center and the opposite lateral ends of the sheet as determined along the sheet width, i.e. the warp yarn tension is lower toward the lateral ends of the sheet.
  • Such loser tension causes poor separation of warp yarns in forming a shed opening by separated upper and lower arrays of warp yarns.
  • a device which is designed to increase the tension of warp yarns at the lateral ends of warp yarn sheet is disclosed e.g. in JP 52-110967, JP 58-169545 and JP 59-43150.
  • the device according JP 58-169545 uses a pair of tensioning members which are positioned in parallel to each other at the lateral ends of warp yarn sheet so as to hold the warp yarns therebetween and which are disposed extending at such an angle with respect to a line along the widthwise direction of the warp yarn sheet that the outer end of each of the tensioning members is positioned closer to cloth fell than the inner end thereof.
  • substantially constant tension can be applied to the lateral ends of warp yarn sheet. If the tension is increased for improvement in separation of warp yarn into upper and lower sheets, however, the warp yarns at the lateral ends will be constantly subjected to a high tension, which may cause the warp yarns to break.
  • the time at which tension is applied depends solely on a predetermined shedding curve, with the result that there is no freedom of adjusting the time of tension application.
  • the warp yarn tension differs between the time of shed opening and shed closing of the warp yarn sheet because each shed opens and closes at a different time, compared to the other.
  • the rate of difference is higher at the lateral ends of the sheet, where the basic tension is lower.
  • the droppers at the lateral ends of the warp yarn sheet will vibrate and possibly even jump more, compared to droppers in the more central parts of the warp yarn sheet.
  • Such increased vibration may cause the warp yarns at the lateral part to be fluffered and even to break and/or the selvage to become irregular.
  • the tensioning member of the device is operated to press on the opposite lateral ends of warp yarn sheet for each weft picking at a time which is selectably adjusted by the tension application time adjusting means according to the invention.
  • the warp yarns at the lateral ends can be tensioned at the right time for weft picking.
  • timed application of tension to warp yarns in accordance with lateral end of warp yarns the time of weft picking provides for smooth separation of warp yarns at the lateral ends, thereby to forming a shed opening without a delay. As a result, failure in weft picking due to inadequate shed opening is prevented successfully.
  • reducing the difference in tension in the warp thread in the open and the closed shed position is achieved by adjusting the time of pressing on the lateral ends of the warp yarn sheet according to the time of the shed is closing of the warp yarn sheet. This measure reduces vibration of droppers and fluffering and consequently warp yarn breaks considerably.
  • the shed is closing provides for increasing the tension of the lateral part of the warp yarn sheet.
  • the difference in tension of the lateral part of the warp yarn sheet is limited between the open shed and the closed shed position of the warp sheet in the weaving cycle.
  • the time at which the tensioning member is operated to apply tension to opposite lateral ends of warp yarn sheet can be adjusted as desired in accordance with the time of weft picking or the time of closing and opening the warp yarn shed.
  • timed application of tension to warp yarns in accordance with the time of picking can make possible smooth separation of warp yarns at the lateral ends thereby to form a shed opening without a delay.
  • failure in weft picking due to inadequate shed opening can be prevented successfully.
  • Timed application of tension to warp yarns in accordance with the closing of the shed basically reduces the differences of yarn tension in the weaving cycle. This difference makes possible a smooth separation of warp yarns at the lateral ends thereby to form a shed opening without a delay. As a result, failure in weft picking due to inadequate shed opening can be prevented successfully.
  • the device for tensioning the warp yarns allows for tension by operation of the tensioning member to apply tension to opposite lateral ends of warp yarn sheet and can be adjusted as necessary and required in accordance with the time of weft picking.
  • timed application of tension to warp yarns provide for smooth separation of warp yarns at the lateral ends, thereby forming a shed opening without a delay. As a result, failure in weft picking due to inadequate shed opening can be prevented successfully.
  • Fig. 1 to 9 show a first embodiment and Fig. 1A to 4A show another embodiment of the invention and details thereof;
  • Fig. 1 is a schematic side view showing an embodiment of the device according to the present invention as applied to a jet loom
  • warp yarns T unwound from a warp beam 19 are moved over a back roller 1 and a easing roller 2 and further through respective warp break detectors 3 and healds 4, and then woven by a reed 5 into a fabric W which is wound by a take-up roll 6.
  • References W1 designates a cloth fell and N depicts a main picking nozzle which is swingable together with the reed 5.
  • the easing roller 2 is supported by and between a pair of easing levers 7A and 7B which are swingable about pivot shafts 8a and 8b, respectively.
  • the easing levers 7A, 7B have connected thereto at the distal ends thereof a pair of rods 9A, 9B, which are in turn connected to crank mechanism (not shown).
  • the crank mechanism operates in synchronism with the rotation of the loom so that the rods 9A, 9B make one stroke of reciprocating motion for one complete rotation of the loom.
  • Support brackets 10A, 10B are fixed to the proximal ends of the respective easing levers 7A, 7B, and tensioning rollers 11A, 11B are cantilevered at one ends thereof to the support brackets 10A, 10B via connectors 12A, 12B.
  • the tensioning rollers 11A, 11B extend inward of the warp yarn sheet T and positioned at an angle with respect to a plane formed by warp yarn sheet T1 between the back roller 1 and easing roller 2.
  • the support brackets 10A, 10B have formed therein elongated holes 10a through which bolts 13A, 13B extend to be screwed into the connectors 12A, 12B.
  • the connectors 12A, 12B are detachably fixed to the support brackets 10A, 10B by means of the bolts 13A, 13B.
  • the elongated hole 10a extends in a direction across the warp yarn sheet T1 between the back roller 1 and easing roller 2, thus permitting the tensioning rollers 11A, 11B to be positioned adjustably along the hole 10a, hence in a direction across the warp yarn sheet T1.
  • the sketches (a) (b) and (c) of Fig. 4 show the tensioning roller 11A which is positioned on the side adjacent to the main weft picking nozzle N.
  • the tensioning roller 11A is swingable integrally together with the easing roller 2 about the pivotal shaft 8A.
  • the same is true of the other tensioning roller 11B provided on the opposite side of the loom.
  • the curved lines C1, C2 show shedding curves of two alternating upper and lower arrays of warp yarns.
  • the curved line C3 shows a swing curve of the easing roller 2, and the curved line C4 a swing curve of the tensioning roller 11A, respectively.
  • Abscissa X for the swing curve C4 represents the position where the tensioning roller 11A is placed just in contact with the warp yarn sheet T1, and the swing curve C4 represents the angle to which the tensioning roller 11A has swung from the above position X.
  • Abscissa X for the swing curve C4 represents the position where the tensioning roller 11A is placed just in contact with the warp yarn sheet T1
  • the swing curve C4 represents the angle to which the tensioning roller 11A has swung from the above position X.
  • the area which is above the abscissa X shows the area in which the tensioning roller 11A is kept in contact with the warp yarn sheet T1
  • the area below the abscissa X shows the area in which the roller is clear of the warp yarn sheet.
  • the sketch (a) of Fig. 4 shows the position of the easing roller 2 and the tensioning roller 11A, where the warp yarn shed is closed, and the sketsch (c) of the same figure shows the position of the easing roller 2 and the tensioning roller 11A, where the warp yarn shed is wide open.
  • the sketch (b) of Fig. 4 shows the position where the tensioning roller 11A has been just moved into, or it is just about to move away from, contact engagement with the warp yarn sheet T1.
  • position of the tensioning roller 11A between the condition (a) and (b) of Fig. 4 correspond to the curved line C4 in the area below the abscissa X in Fig. 5
  • position of the tensioning roller 11A between the conditions (b) and (c) correspond to the curved line C4 in the area above the abscissa X.
  • a basic difference of the embodiments of the invention displayed in Fig. 1A, 2A, 3A and 4A (a), (b) and (c) is that the tensioning rollers 11A is moving the warp yarn sheet T away from the back roller 1 and the easing roller 2 and not against back roller 1 and easing roller 2 when the warp yarn sheet must be tensioned
  • the curved line C5 indicates the distrubution of warp yarn tension without use of the tensioning rollers 11A, 11B, as measured in the widthwise direction of the warp yarn sheet when the shed is open.
  • the curved line C6 shows the distribution of warp yarn tension when tension is applied by the tensioning rollers 11A, 11B. It is apparent from the diagram that smoothness in separation of warp yarns into upper and lower sheets at the lateral ends T L and T R can be improved by increasing the tension at such ends of the warp yarn sheet.
  • the time at which the tension is applied to the ends T L and T R by the tensioning rollers 11A, 11B can be adjusted so as to form the shed opening at the right time for weft picking. This is accomplished by adjusting the mounting position of the tensioning rollers 11A, 11B along the elongated holes 10a in the support brackets 10A, 10B with respect to the easing levers 7A, 7B in accordance with the weft picking time.
  • the warp yarn sheet at its lateral ends T L and T R will not be subjected constantly to high tension, there is no fear of warp yarn break due to constant application of high tension, as was observed in pior art device.
  • the adjustment of the mounting position of the tensioning rollers 11A, 11B can be performed easily merely by moving the connectors 12A, 12B along the holes 10a in the support brackets 10A, 10B with the bolts 13A, 13B loosened. This adjustment will displace the curved line C4 in Fig. 5 in upward or downward direction with reference to the abscissa X.
  • an air cylinder 14 having a movable rod at the distal end of which is mounted a tensioning member 14a.
  • the tensioning member 14a is moved by the air cylinder 14 to press on a lateral end of warp yarn sheet T1 between the back roller 1 and easing roller 2.
  • Operation of the air cylinder 14 is controlled by an electromagnetically operated valve (not shown) which is operable to be energized or deenergized at controlled times in response to the time of each weft picking.
  • an electromagnetically operated valve (not shown) which is operable to be energized or deenergized at controlled times in response to the time of each weft picking.
  • FIG. 8 which is applied to a weaving loom having no back roller, there is porvided an air cylinder 14 carrying a tensioning menber 14a which is movable to press on a lateral end of warp yarn sheet T between the easing roller 2 and warp stop bar 15.
  • the air cylinder 14 may be substituted with any suitable means such as electromagnetic solenoid.
  • a lever 16 swingably supported by a pivotal shaft 20 and having at one end thereof a tensioning member 16a which is engageable with a lateral end of warp yarn sheet.
  • the lever 16 is connected at the other end thereof via a rod 18 to a crank disk 17 which is in turn coupled to a drive of the loom.
  • the end of the rod 18 remote from its connection with the lever 16 is adjustably connected to the crank disk 17 through an elongated hole 17 formed in the disk. Adjustment of the connecting position of the rod 18 to the crank disk 17 can permit timed application of tension by the tensioning member 16a to the lateral end of warp yarn sheet T.
  • the time at which the tensioning member is operated to apply tension to opposite lateral ends of warp yarn sheet can be adjusted as desired in accordance with the time of weft picking.
  • timed application of tension to warp yarns can make possible smooth separation of warp yarns at the lateral ends thereby to form a shed opening without a delay.
  • failure in weft picking due to inadequate shed opening can be prevented successfully.
  • Tensioning rollers 11A, 11B Tensioning time adjusting means including elongated holes 10a, connectors 12A, 12B and bolts 13A, 13B; warp yarn sheet T; Lateral ends of warp yarn sheet T L , T R .
  • the device (9A,7A,10a,10b,11A) for tensioning the warp yarns (T) allows for tension by operation of the tensioning members (11A,11B) to apply tension to opposite lateral ends of warp yarn sheet and can be adjusted as necessary and required in accordance with the time of weft picking and/or the time of shed closing.
  • timed application of tension to warp yarns at the time of picking provides for smooth separation of warp yarns at the lateral ends, thereby forming a shed opening without a delay.
  • failure in weft picking due to inadequate and improper shed opening can be prevented successfully.
  • the decrease of difference of tension in the open shed and the closed shed points in the weaving cycle reduces vibration of droppers and as a consequence also fluffering and even the number of breaks of warp threads (T).

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Claims (7)

  1. Dispositif pour la mise sous tension de fils de chaîne dans un métier à tisser, comportant un mécanisme de mise sous tension d'un fil de chaîne (9A, 7A, 8A) comprenant un organe de mise sous tension (11A) pour appliquer une tension sur les extrémités latérales opposées (TL, TR) d'une nappe de fils de chaîne (T) par pression sur lesdites parties d'extrémité latérale, caractérisé en ce qu'il possède un moyen d'ajustement dans le temps, pour ajuster le moment de la poussée par ledit organe de mise sous tension (11A) sur lesdites extrémités latérales (TL, TR) de la nappe de fils de chaîne (T) en accord avec un moment voulu, pour réduire la différence de tension des fils de chaîne sur la largeur de la nappe de fils de chaîne (T) dans un cycle de tissage.
  2. Dispositif pour la mise sous tension de fils de chaîne selon la revendication 1, dans lequel le moment voulu de mise sous tension dans le cycle de tissage est relié au temps d'introduction de la duite et est situé à l'intérieur de celui-ci.
  3. Dispositif pour la mise sous tension de fils de chaîne selon la revendication 1, dans lequel le moment voulu pour la mise sous tension dans le cycle de tissage est lié au temps de la fermeture de la foule de la nappe de fils de chaîne (T) et tombe à l'intérieur de celui-ci.
  4. Dispositif pour la mise sous tension de fils de chaîne selon l'une quelconque des revendications 1 à 3, comprenant un organe de mise sous tension (11A, 11B) s'étendant à l'intérieur de la chaîne et positionné suivant un angle par rapport au plan défini par la nappe de fils de chaîne (T₁) de manière telle que l'augmentation de la tension est la plus haute sur la partie la plus latérale de la partie d'extrémité latérale de la nappe de fils de chaîne (T₁).
  5. Dispositif pour la mise sous tension de fils de chaîne selon l'une quelconque des revendications 1 à 4, comprenant des moyens d'actionnement entraînés en fonction de l'angle de rotation de l'arbre principal du métier à tisser.
  6. Dispositif pour la mise sous tension de fils de chaîne selon l'une quelconque des revendications 1 à 5, comprenant un entraînement pneumatique ou hydraulique (14) pour actionner l'organe de mise sous tension (14a).
  7. Dispositif pour la mise sous tension de fils de chaîne selon l'une quelconque des revendications 1 à 5, comprenant un levier (16) supporté en va-et-vient par un arbre de pivotement (20), l'organe de mise sous tension (16a) étant fixé d'un côté dudit levier (16).
EP19910810396 1990-05-24 1991-05-24 Dispositif pour tendre les fils de chaîne dans un métier à tisser Expired - Lifetime EP0458754B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP134520/90 1990-05-24
JP2134520A JP2987881B2 (ja) 1990-05-24 1990-05-24 織機における経糸張力付与装置

Publications (2)

Publication Number Publication Date
EP0458754A1 EP0458754A1 (fr) 1991-11-27
EP0458754B1 true EP0458754B1 (fr) 1995-11-29

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EP19910810396 Expired - Lifetime EP0458754B1 (fr) 1990-05-24 1991-05-24 Dispositif pour tendre les fils de chaîne dans un métier à tisser

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EP (1) EP0458754B1 (fr)
JP (1) JP2987881B2 (fr)
DE (1) DE69114912T2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5358351A (en) * 1992-09-30 1994-10-25 Casio Computer Co., Ltd. Printing apparatus and printing tape cassette used therefor
JP5464172B2 (ja) * 2011-05-27 2014-04-09 株式会社豊田自動織機 パイル織機のパイル経糸張力調整装置
CN102817164A (zh) * 2012-07-23 2012-12-12 苏州迪盛织造整理有限公司 喷水织机布边张力控制装置
JP6344411B2 (ja) * 2016-02-25 2018-06-20 株式会社豊田自動織機 織機における経糸開口装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH250056A (fr) * 1944-12-29 1947-08-15 Dewas Raymond Dispositif pour tendre les fils de chaînes des lisières se déroulant d'une ensouple.
CH378808A (de) * 1960-05-11 1964-06-15 Sulzer Ag Webmaschine und zugehöriges Betriebsverfahren
NL7600568A (nl) * 1976-01-20 1977-07-22 Rueti Te Strake Bv Weefmachine.

Also Published As

Publication number Publication date
DE69114912D1 (de) 1996-01-11
JP2987881B2 (ja) 1999-12-06
EP0458754A1 (fr) 1991-11-27
JPH0434047A (ja) 1992-02-05
DE69114912T2 (de) 1996-08-01

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