US3362436A - Method and apparatus for the production of a fabric free of warp-wise running irregularities at a wave weaving loom - Google Patents

Method and apparatus for the production of a fabric free of warp-wise running irregularities at a wave weaving loom Download PDF

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Publication number
US3362436A
US3362436A US481471A US48147165A US3362436A US 3362436 A US3362436 A US 3362436A US 481471 A US481471 A US 481471A US 48147165 A US48147165 A US 48147165A US 3362436 A US3362436 A US 3362436A
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Prior art keywords
fabric
warp
tension
fell
deflecting
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Expired - Lifetime
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US481471A
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English (en)
Inventor
Fend Heinrich
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OC Oerlikon Corp AG Pfaeffikon
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Oerlikon Buehrle Holding AG
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/12—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick
    • D03D47/26—Travelling-wave-shed looms
    • D03D47/268—Mechanisms for compensating warp tension

Definitions

  • the present invention has reference to an improved method of, and apparatus for, the production of fabrics free of warp-wise running irregularities in a wave weaving loom.
  • the fell line of the departing fabric be permitted to pass over both edges of a trough having a cross-section which widens in trapezoidal manner towards the bottom, and for the fabric to pass between these edges beneath a rod disposed in this trough, the diameter of which is larger than the mutual spacing of the aforementioned edges of the trough.
  • this rod Owing to the increased tension of the fabric during return of the reed, this rod is pulled towards the. walls of the trough which narrows towards the top and is wedged therebetween, whereby the fabric is fixedly clamped so that it cannot move backwards any furthenThe unwoven warp portions, the tension of which again assumes a value controlled by a regulating device, t-hus experience a small elongation during the next beating action of the reed and attain a smaller maximum tension than with free movement of the fell line of the cloth.
  • Another more specific object of this invention is to provide an improved method of, and apparatus for, weaving a fabric at a wave weaving loom which is substantially free of warp-wise running irregularities.
  • the fabric in order to solve the aforementioned problem with which the invention is concerned, it must be possible for the fabric to be advanced forwards in the region of th s small width, and in the remaining portion of the weaving width it must be fixed against displacement in the warp direction.
  • this is achieved by causing the fabric which runs forward from the said fell, to pass in the region immediately adjacent to the fell over at least one stationary surface having a convex curvature in the warp direction of the fabric, whereby the fabric is maintained in frictional engagement with said surface as a result of the warp-wise tension in which it is subjected.
  • those portions of the fell of the fabric on which tension is exerted through the still unwoven portions of the warp threads running towards the fell on one side, and through the adjacent forwardly extending portion of the fabric on the other side, are immobilized by the said frictional engagement against Warp- Wise displacement.
  • such displacement is rendered possible by reduction or temporary suppression or suspension of such frictional engagement for those portions of the fell at which a weft thread is being beaten up by members (hereinafter called reed groups) which at least temporarily prevent the tension of the said unwoven warp thread portions from being transmitted to the fabric which extends forwardly of the fell.
  • FIGURE 1 is a schematic longitudinal sectional view through a wave Weaving loom equipped with a preferred embodiment of the apparatus
  • FIGURE 2 is a fragmentary schematic top plan view of a portion of the wave weaving loom of FIGURE 1 equipped with the inventive apparatus for performing the inventive method;
  • FIGURE 3 is a partial perspective view showing the cloth deflecting members.
  • the illustrated wave weaving loom possesses a warp beam 11 from which travels a chain of warp threads which pass over a tension beam 12 and partially through harnesses 13, partially through harnesses 14, which deflect the warp threads 10 upwardly and downwardly in order to form sheds 29.
  • the chain of warp threads 10 pass from the harnesses 13, 14 towards the fell line 15.
  • the individual harnesses 13, 13, 13", 13", etc. and 14, 14', 14", 14", etc. in each instance, only extend over a small portion of the weaving width.
  • each shed only extends over a few, approximately 3, harness widths and travels in the direction of the arrow 31, from the left to the right, across the weaving width.
  • a weft thread is inserted by a shuttle 28 and behind such shuttle the inserted thread is beaten towards the fell line 15 by means of a group of reeds 27 which extend across a fraction of the harness width.
  • This fell line 15 is formed at each location of the fabric width by a weft thread inserted in the last shed travelling through this location which is beaten and interlaced by the warp threads crossing over this weft thread at the rear of this shed with respect to the weft inserting direction.
  • the fabric continuously produced at such fell line 15 moves over a stationary support surface or rail 16 extending transversely over the full fabric or cloth width.
  • Support or deflecting rail 16 has a deflecting surface 15a which substantially possesses the form of a segment of a cylinder and exhibits grooves or ridges 32 extending obliquely towards the outside from the rear towards the front (FIGURE 2).
  • the fabric 20 is then guided beneath a likewise stationary cylindrical rod 17 extending over the same cloth width and then is guided over a similar stationary rod 18. From the latter the fabric moves further over an indexing or controller roll 21 which rotates continuously during operation of the loom, then between such indexing roll 21 and a cooperating contact roll 22, and over the latter to the cloth beam 23 where it is wound up.
  • Cloth beam 23 is driven with a controlled rotational speed in such a manner that a cloth package is formed thereon, the cloth possessing a uniform tension.
  • the deflecting or support rail 16 is stationarily seated upon a box or housing 24 mounted on the frame 30 of the loom.
  • This box 24 contains the drive mechanism for the reed group 27 and the shuttles 28.
  • Box 24 also supports both of the deflecting rollers or rods 17 and 18 through the agency of lateral support plates 19 connected to the aforesaid box.
  • Rods 17 and 18 engage by means of rectangular shaped end studs or lugs 17a and 18a respectively, with appropriate recesses 19a and 1% respectively provided at the plates 19, and specifically, in such a manner that they cannot rotate about their corresponding lengthwise axis, yet are easily demountable.
  • Slides 25 capable of moving to and fro between a forward and rear terminal position are guided in the box 24 and extend rearwardly beneath the region in front of the harnesses 13 and 14 traversed by the travelling sheds 29.
  • each slide member 25 carries one of the reed groups 27, the individual beat-up reeds of which, during each position of the slide, piercingly extend upwards between the warp threads 10 and during movement of the slide 25 move to and fro between a rear terminal position neighboring the harnesses 13 and 14 and a forward terminal position directly neighboring the support rail 16 and determining the position of the fell line 15.
  • a bifurcated 0r forked member 26 is seated upon each slide 25 in front of the reed group 27 and which together with the slide 25 neighboring the corresponding bifurcated member 26 receives a rib-shaped, bent, lower projection of the momentarily passing shuttle 31, whereby this shuttle in known manner, and for such reason not explained more fully, is forwardly driven due to the relative movement of the neighboring slides 25.
  • Ser. No. 294,971 and Ser. No. 294,980 both filed July 15, 1963, there is disclosed mechanism for driving the shuttles across the weaving width at a wave weaving loom, and reference may be readily had thereto. However, since details of the physical structure of such mechanism are not believed necessary for understanding the teachings of the present invention no further description thereof is here given.
  • the indexing roll or beam 21 is driven at a speed proportional to the travelling speed of the shuttles 28 and reciprocal to the desired weft thread density.
  • This indexing roll 21 strives to withdraw the warp chain 10 from the warp beam 11 via the fabric 20.
  • This warp beam 11 is uniformly braked in known manner and, thus, maintains the tension of the unwoven portion of the warp chain 10 constant.
  • the fabric 20 extending forwardly from the fell line 15 is guided with such a deflection over the support rail 16 and the rods 17 and 18 disposed directly in front of the fell line 15, that it is pulled with a certain pressure against the corresponding surfaces of such deflecting elements 16, 17 and 18, on the one hand, by the tension of the u'nwoven portion of the warp threads 10 and, on the other hand, by the tension in'iparted to it by the indexing roll 21. Due to the friction of the fabric 20 at such surfaces and caused by such pressure the fabric is fixedly held against displacement in the direction of the warp, so that the tension of the indexing roll 21 upon the fabric 20, without anything further, will not bring about any displacement in the warp direction.
  • this weft thread is displaced by the reed group 27 to the same location previously occupied by the last weft thread beaten by it, and since further movement of the fabric 20 at the side of the indexing roll 21 is prevented by the defiecting members 16, 17 and 18, the newly inserted weft thread is only displaced forwardly through a weft thread division of the fabric 20.
  • This feed is not hindered on account of its minuteness by the fact that at both neighboring regions of the fabric width, at which other reed groups are effective, at the same moment there does not appear any feed of the fabric 20.
  • This difference in feed is momentarily compensated due to the mutual displaceability of the threads also in the finished fabric and due to its elasticity; moreover, it only occurs at the forward flank of the relevant reed group 27 with respect to the direction of travel of the shuttles 28, since the reed groups in this direction of travel successively perform a beating action and each thus forwardly displaces the Weft thread to the same extent as it has been forwardly displaced in the previous moment by the reed group located at its rear flank.
  • the elasticity of the fabric 20 also makes it possible to continuously rotate the indexing or controller roll 21 notwithstanding the fact that the feed movement of the fabric 20 is intermittent a each location of its width.
  • these rods 17 and 18 are preferably manufactured so as to have a slight longitudinal curvature in the absence of external forces as shown in FIGURE 3, in such manner that when they will be subjected to the action of the expected tension of the fabric, their axes will be deflected to extend approximately straight from one side plate 19 to the other. As shown in FIGURE 3,
  • the rods 17 and 18 are provided at their ends with flat extensions 17a, 18a, respectively, which engage corresponding guide slots 19a, 19b, in the side plates 19.
  • each rod extension 17a, 18a in the respective slot 19a, 19b is determined by an adjustment screw 40 screwed through an abutment 190 formed on the side plate 19.
  • the fluting or notching 32 0f the support rail 16 extending obliquely or at an inclination from the inside to the outside in the direction of travel of the fabric 29 causes a traction or tension to be exerted in transverse direction i.e. across the width, upon the fabric directly at the fell line 15, so that such tends to pull together as little as possible after insertion and beating of the weft thread.
  • a corresponding fluting could also be provided at the lower portion of the deflecting roller 17, and, if desired, at the rear and upper sides of the deflecting roller 18, although it is hardly there necessary.
  • the deflecting or sup-port rail 16 provides the further advantage with regard to shed formation that due to it the elevational position of the fell line 15 is fixed.
  • Method according to claim 1 including the step of exerting a transverse extending pulling force on the fabric extending forwardly of the fell line in the region of said stationary convex surface.
  • Method according to claim 1 including the step of additionally deflecting the fabric extending forwardly of the fell line over a second convex guiding surface.
  • an apparatus to control the movement of the fell line to form said fabric free of warp-wise extending irregnlarities comprising at least one stationary segment shaped deflecting member positioned to cooperate with the woven fabric formed at the fell line and extending forwardly of the fell line, said deflecting member including a sup-port convex guiding surface extending in the direction of the warp of said fabric.
  • said deflecting member is constructed in the form of a rail which extends substantially across the full fabric width.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US481471A 1964-10-09 1965-08-23 Method and apparatus for the production of a fabric free of warp-wise running irregularities at a wave weaving loom Expired - Lifetime US3362436A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1314564A CH421014A (de) 1964-10-09 1964-10-09 Verfahren und Einrichtung zur Erzeugung kettstreifenfreien Gewebes auf einer Wellenwebmaschine

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US3362436A true US3362436A (en) 1968-01-09

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US481471A Expired - Lifetime US3362436A (en) 1964-10-09 1965-08-23 Method and apparatus for the production of a fabric free of warp-wise running irregularities at a wave weaving loom

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US (1) US3362436A (es)
AT (1) AT265163B (es)
BE (1) BE670643A (es)
CH (1) CH421014A (es)
DE (1) DE1291295B (es)
ES (1) ES318610A1 (es)
GB (1) GB1128032A (es)
NL (1) NL6512229A (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3952780A (en) * 1973-10-24 1976-04-27 Vyzkumny Ustav Bavlsnarsky Fabric stabilizing apparatus disposable at the input of the weft beat-up zone of travelling-wave shedding looms
US3967655A (en) * 1972-06-12 1976-07-06 Vyzkumny Ustav Bavlnarsky Apparatus for stabilizing the fabric within the weft beat-up area in wave weaving looms

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH252997A (de) * 1945-07-21 1948-02-15 Bechter Ludwig Stoffspannvorrichtung an Webstühlen.
US2756781A (en) * 1950-11-14 1956-07-31 Deering Milliken Res Corp Method and means for eliminating set marks
US2884015A (en) * 1953-10-22 1959-04-28 Bechter Hermann Tensioning roller for weaving looms
GB944231A (en) * 1959-01-10 1963-12-11 Wool Ind Res Association Improvements relating to temples for weaving looms

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR705177A (fr) * 1930-11-06 1931-06-02 Diederichs Atel Poitrinière de métier à tisser
CH255870A (de) * 1947-12-24 1948-07-15 Bechter Hermann Vorrichtung zum Strecken der Stoffbahn in der Schussrichtung an Webstühlen.
CH307597A (fr) * 1953-01-27 1955-06-15 Juillard Yves Procédé de tissage et métier rectiligne pour sa mise en oeuvre.
GB787995A (en) * 1953-10-22 1957-12-18 Hermann Bechter Improvements in or relating to tensioning rollers for stretching webs of material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH252997A (de) * 1945-07-21 1948-02-15 Bechter Ludwig Stoffspannvorrichtung an Webstühlen.
US2756781A (en) * 1950-11-14 1956-07-31 Deering Milliken Res Corp Method and means for eliminating set marks
US2884015A (en) * 1953-10-22 1959-04-28 Bechter Hermann Tensioning roller for weaving looms
GB944231A (en) * 1959-01-10 1963-12-11 Wool Ind Res Association Improvements relating to temples for weaving looms

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967655A (en) * 1972-06-12 1976-07-06 Vyzkumny Ustav Bavlnarsky Apparatus for stabilizing the fabric within the weft beat-up area in wave weaving looms
US3952780A (en) * 1973-10-24 1976-04-27 Vyzkumny Ustav Bavlsnarsky Fabric stabilizing apparatus disposable at the input of the weft beat-up zone of travelling-wave shedding looms

Also Published As

Publication number Publication date
AT265163B (de) 1968-09-25
GB1128032A (en) 1968-09-25
BE670643A (es) 1966-01-31
DE1291295B (de) 1969-03-20
ES318610A1 (es) 1966-05-16
CH421014A (de) 1966-09-15
NL6512229A (es) 1966-04-12

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