US2943364A - Drawing mechanisms for textile rovings - Google Patents

Drawing mechanisms for textile rovings Download PDF

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Publication number
US2943364A
US2943364A US660382A US66038257A US2943364A US 2943364 A US2943364 A US 2943364A US 660382 A US660382 A US 660382A US 66038257 A US66038257 A US 66038257A US 2943364 A US2943364 A US 2943364A
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United States
Prior art keywords
roller
rollers
fibres
pressure
small diameter
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Expired - Lifetime
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US660382A
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English (en)
Inventor
Solanas Ramon Balmes
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Estirajes Balmes SA
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Estirajes Balmes SA
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Application filed by Estirajes Balmes SA filed Critical Estirajes Balmes SA
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Publication of US2943364A publication Critical patent/US2943364A/en
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/26—Drafting machines or arrangements without fallers or like pinned bars in which fibres are controlled by one or more endless aprons
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/22—Drafting machines or arrangements without fallers or like pinned bars in which fibres are controlled by rollers only

Definitions

  • the present invention relates to improvements in the mechanisms for the drawing of rovings or slivers of textile fibres, in which there is employed, in a position very close to the final or delivery rollers of the yarn or roving, a pair of rollers consisting of a positively actuated bottom roller and a top roller of small diameter which bears by its own weight upon this bottom roller, in such a way that this pair of rollers permits the slipping of the fibres that are already seized by the final or delivery rollers.
  • the improvements of this invention are similarly applicable to apparatus in which the guidance of the fibres from the middle rollers to the producer or delivery rollers is eiiected by the action of a positively actuated endless belt, upon which there bears by its own weight, at a point very close to the delivery rollers, a roller of small diameter, in such a manner that it likewise permits slipping of the fibres that are seized by the delivery rollers.
  • this roller of small diameter close to the delivery rollers has always been made of metal, synthetic resin or other rigid material, and is arranged in such a manner that it bears upon the fibres solely by its own weight, for the purpose of permitting the fibres to slip.
  • this driving roller should be of small diameter, in order that it may be able to occupy a position very close to the producer or delivery rollers, as a result of which its weight is always relatively very limited, and the pressure or retaining force that it exerts upon the fibres is likewise very limited.
  • this top roller turns solely owing to the frictional impulsion of the bottom roller or belt, slipping or lag is liable to occur between the top roller and the bottom roller, and this, combined with the smallness of the pressure exerted by the top roller, and the smallness of its adhesion to the fibres, results in the fibres not being suitably retained by this roller, but that occasionally it permits the passage, at indeterminate intervals, of fibres that have not yet been engaged by the final drawing rollers, and therefore ought not to be entrained.
  • This fibre-retaining roller preferably consists of a metal shaft of suitable diameter, around which is arranged the body of the roller, made of a rubber composition or ofa sufliciently soft and resilient synthetic material, so that when this roller is applied to the bottom roller or belt and receives the pressure of the loading mechanism, the lower portion of the roller will flatten slightly and apply itself to the bottom roller over an area of appreciable extent. In this way an efiicacious retention will be exerted upon the fibres without impairing them, owing to the pressure being exerted by a pliable and resilient substance.
  • Figure 1 illustrates diagrammaticallyv the rollers of a drawing mechanism consisting of successive pairs of rollers, including a roller of small diameter according to this invention
  • Figure 2 represents, likewise diagrammatically, the arrangement of a drawing mechanism in which there is employed, for the guidance and impulsion of the fibres, an,
  • Figure 3 shows one example of the manner of loading or giving pressure to this roller of small diameter in drawing mechanisms in which a pressure saddle is used;
  • Figure 4 illustrates the manner of loading this roller of small diameter in drawing mechanisms provided with an:
  • the mechanism diagrammatically illustrated in Figure 1 comprises a rear pair of feed or delivery rollers 1, 2, a.
  • the roving 20 passes through in succession, between these pairs of rollers, which revolve with progressively increasing speeds, and issues at 21, diminished in thickness so as to be able to receive the torsion and to be converted into yarn.
  • the distance is likewise greater than the length of the fibres, and between these pairs of rollers there is usually arranged some fibre-conducting member, such as is described in earlier patents of ours.
  • the distance between the line of contact of the rollers 5, 6 and that of the rollers 7, 8 is on the other hand always substantially less than the length of the fibres, so that the fibres that are already engaged by the rollers 7 and 8 have to be able to slip through between the rollers 5 and 6 and these rollers in reality effect a work of retention of the fibres of the roving, so as to prevent the fibres that are not yet engaged by the rollers 7, 8 from being dragged along by contact with the other fibres of the roving, which are already engaged by this pair of rollers.
  • the roller 6 is not solid, of metal or other hard material, but consists of a shaft or core 16 of metal or other suitable material, which is extended at the end of the roller to form journals for this roller, and a covering 26 of a resilient composition having a basis of india rubber or of a resilient plastic rubber substitute, and this roller is furthermore loaded by the same pressure mechanism as the other rollers; with a pressure which is always several times asgreatas the actual weight of a completely metallic roller;
  • This pressure may be as much as 1000 grams or more, or may be ten or more times the pressure that would be exerted by the intrinsic weight of the roller 6; and owing to the roller being of soft material it flattens slightly in contact with the bottom roller 5 or with the belt 9, so thatinstead of there being only line contact between the roller 6 and the bottom roller 5 or belt 9 there is a surface or small zone of contact between the roving 20 and the bottom roller or belt.
  • the pressure of the roller 6 can be calculated in such a way that the force or tension to which the fibres are subjected will be less than the force necessary to break them, and this force constrains the fibres to straighten energetically at the same time as the resilient contact strip permits them to slip following the velocity of the rollers 7, 8, which contributes decidedly to bringing it about that the fibres that have to form the yarn on issuing from the rollers 7, 8 remain very straight, and therefore completely parallel to one another, a condition which likewise contributes towards imparting to the yarns an appearance of regularity considerably superior to that of yarns obtained with the usual mechanisms.
  • roller 6 is covered with a soft and resilient material, and is subjected to'a pressure up to ten times as great as the pressure of the intrinsic weight of the roller, imparts a security of rotation to the roller 6, so that the slightest risk of pernicious slipping of this roller 6 upon the bottom roller 5 is eliminated, thereby providing a certainty and a greater uniformity of the fibres delivered by these rollers to the front rollers 7, 8.
  • Figures 3 and 4 mechanical devices suitable for loading this roller 6 with the necessary pression are illustrated.
  • Figure 3 represents the case of a drawing mechanism in which an ordinary pressure mechanism with a pressure saddle 12 of a type already known is employed for loading the top rollers 2, 4 and 8, actuated by a tractive element 13.
  • Figure 4 illustrates the application to a drawing mechanism which comprises an upper arm 19, which carries the bearings of the top rollers 2, 4 and 8, and suitably loads these rollers.
  • a drawing mechanism which comprises an upper arm 19, which carries the bearings of the top rollers 2, 4 and 8, and suitably loads these rollers.
  • the bearing 22 of the top roller 8 has been shown, which is the only one that is of interest for the comprehension of the mechanism.
  • each side of the bearing 22 there is mounted on each side of the bearing 22 an angular bracket 23, 24, the arm 23 of which is fixed in an adjustable position to the' bearing 22 by means of a clamping screw 25, while the arm 24 is formedwith a notch which embraces the journals 16 of the roller 6 of a small diameter, and has a bore enclosing a piston-like push-piece 28, which is actuated by a spring 27, and which bears upon the journals 16, and thus loads the small roller 6.
  • a drawing mechanism for textile rovings comprising a pair of delivery rollers, and a small diameter, undriven roller preceding said delivery rollers and spaced therefrom a distance less than the length of the fibers of the roving said small diameter, undriven roller having a center of rigid material and a peripheral layer of soft, resilient material, a driven roving conveying means against which said small diameter roller bears for conveying the roving between said small diameter roller and said roving conveying means, and delivery roller pres sure applying means bearing on one of said delivery rollers and further pressure applying means mounted on said delivery roller pressure applying means and bearing on said small diameter roller and pressing on said small diameter roller with a force several times the weight of said small diameter roller and sulficient to cause said small diameter roller to contact said roving conveying means over an area having a dimension in the direction of movement of the roving substantially greater than the area of a line contact.
  • a drawing mechanism as claimed in claim 1 in which said pressure applying means applies pressure on said small diameter roller at least ten times the weight of said small diameter roller.
  • a drawing mechanism as claimed in claim 1 in which said further pressure applying means comprise a lever having one end pivotally mounted on said delivery roller pressure applying means, said small diameter roller having journals on which the other end of said lever bears, and spring means on said delivery roller pressure applying means and bearing on said lever and urgingsaicl lever against the journals of said small diameterroller.
  • said further pressure applying means comprise an angular bracket having one arm slidably mounted on said delivery roller pressure applying means, and having a slot in the end of the other arm, said small diameter roller having journals thereon, said slot receiving said journals therein, and spring loaded piston members in 5 said other arm of said bracket and bearing on said journals and urging said roller against said roving conveying means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Treatment Of Fiber Materials (AREA)
US660382A 1956-06-13 1957-05-20 Drawing mechanisms for textile rovings Expired - Lifetime US2943364A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES340743X 1956-06-13
ES2943364X 1956-06-13

Publications (1)

Publication Number Publication Date
US2943364A true US2943364A (en) 1960-07-05

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Application Number Title Priority Date Filing Date
US660382A Expired - Lifetime US2943364A (en) 1956-06-13 1957-05-20 Drawing mechanisms for textile rovings

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US (1) US2943364A (fr)
CH (1) CH340743A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190360128A1 (en) * 2018-05-24 2019-11-28 Saurer Spinning Solutions Gmbh & Co. Kg Drafting system and drafting system unit for a spinning machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1144368B (it) * 1981-05-20 1986-10-29 Gaudino Di P Gaudino & C Sas O Perfezionamenti nei laminatoi con almeno un campo di stiro per la filatura diretta di pettinato e semipettinato
US6250060B1 (en) * 1997-04-18 2001-06-26 Wellman, Inc. Method of producing improved knit fabrics from blended fibers

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1696553A (en) * 1926-11-26 1928-12-25 Whiting Machine Works Drafting system
US1839772A (en) * 1930-01-06 1932-01-05 Pflimlin Jules Spinning frame and the like
US2422444A (en) * 1944-04-14 1947-06-17 Solanas Ramon Balmes Drawing mechanism for textile slivers
US2610362A (en) * 1948-11-17 1952-09-16 Collins & Aikman Corp Rotary roll clearer for draft frames
US2771639A (en) * 1950-07-03 1956-11-27 Aymerich Jose Maria Bosch System for drafting fibrous materials

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1696553A (en) * 1926-11-26 1928-12-25 Whiting Machine Works Drafting system
US1839772A (en) * 1930-01-06 1932-01-05 Pflimlin Jules Spinning frame and the like
US2422444A (en) * 1944-04-14 1947-06-17 Solanas Ramon Balmes Drawing mechanism for textile slivers
US2610362A (en) * 1948-11-17 1952-09-16 Collins & Aikman Corp Rotary roll clearer for draft frames
US2771639A (en) * 1950-07-03 1956-11-27 Aymerich Jose Maria Bosch System for drafting fibrous materials

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190360128A1 (en) * 2018-05-24 2019-11-28 Saurer Spinning Solutions Gmbh & Co. Kg Drafting system and drafting system unit for a spinning machine
US11879186B2 (en) * 2018-05-24 2024-01-23 Saurer Spinning Solutions Gmbh & Co. Kg Drafting system and drafting system unit for a spinning machine

Also Published As

Publication number Publication date
CH340743A (fr) 1959-08-31

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