US2926393A - Adjustable pressure devices for double endless tape sliver draft units - Google Patents

Adjustable pressure devices for double endless tape sliver draft units Download PDF

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Publication number
US2926393A
US2926393A US646454A US64645457A US2926393A US 2926393 A US2926393 A US 2926393A US 646454 A US646454 A US 646454A US 64645457 A US64645457 A US 64645457A US 2926393 A US2926393 A US 2926393A
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Prior art keywords
tape
arm
sliver
run
endless
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Expired - Lifetime
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US646454A
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English (en)
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Gardella Adriano
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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

Definitions

  • GARDELLA 2,926,393 ADJUSTABLE PRESSURE DEVICES FOR DOUBLE ENDLESS TAPE SLIVER DRAFT UNITS 2 Sheets-Sheet 1 Filed March 15, 1957 A'I'I' RNEY March 1, 1960 A. GARDELLA 2,926,393
  • the present invention has for its object a double endless tape draft unit, particularly for strands or. slivers of long and hard fibres such as hemp, flax, jute, sisal and the like.-
  • the sliver is supported during the whole drafting operation and thus a high and -very high sliver attenuation (high drafting) maybe attained.
  • this end is attained in a very simple and practical manner by mounting the pressure member or members shiftable both in longitudinal direction with respect to the inside or active run of one of the endless tapes and towards and away from said tape.
  • the pressure member or members is or are slidable in longitudinal direction with respect to the tape, on any suitable guide whatsoever which in its turn is mounted either swinging or slidable away and towards the co-acting sections of the tapes, means being provided for controlling both the sliding of the pressure member-carrying parts as well as for controlling the shiftings of the guide.
  • the said pressure member may be constructed either in the form of a convex slide, having its convex part turned towards the co-acting sections of. the tapes, or also may comprise one or a plurality of rotatable rollers, reducing the friction on the tape and enabling more accurate adjustment of the contact point or points thereof with the endless tape.
  • the tape-compressing device comprises a swinging arm carrying the pressure member or members which is or are slidable with regards to the hinge point of said arm, are urged by a spring in one direction and may be pulled by means of a flexible cord or cable in the opposite direction.
  • FIG. 1 shows in elevation a double tape sliver draft unit.
  • Figure 2 is a plan view of the tape-pressing device, viewed from the arrows IIII of Figure 1, and
  • Figure 3 is a section on line IIIIII of Figure 1.
  • 1 and 101 are the feed rollers and 2, 102 the delivery rollers of a drafting unit forming part, for example, of a spinning frame.
  • a pivot 8 is fastened with its axis parallel to the axes of the said pulleys 3, 4.
  • a hub 9 provided with a tubular arm 10 is mounted so as to swing freely.
  • Said arm 10 extends between;the two runs of the tape 6 and terminates with an arcuate bracket-like extension 11 which projects sidewise from the tapes pair 5, 6 and its end, which lies outside of said tapes, is connected by means of a link 12 to a crank 13 fastened on a shaft 14 and the angular position of which may be adjusted by hand by some conventional means (not shown), thus varying the angular position of the arm 10 with respect to the tape run 106.
  • tubular arm 10 is slidably mounted like a telescope a rod 15, which is pushed outwardly by a spring 17 and carries at its free end a pair of rollers 16 rotatably mounted on a pivot 20 the axis of which is parallel to the axis of the pulleys 3, 4.
  • the rollers are pressed more or less against the run 106 of the tape 6 which is thus pressed with a more or less great force against the fibre sliver passing between the tape runs 106 and 105.
  • the slidable rod 15 is held against the force of the spring 17 by two flexible cords or cables 19 attached to a cross member 1'8 at the lower free end of rod 15.
  • the cords 19 pass on two small grooved pulleys 21 rotatably mounted to both sides of the hub 9 and are fastened at 23 to a split sleeve 24 or the like, fastened onto a small shaft 22. By rotating the shaft 22, the cords 19 are pulled more or less, thus varying the amount of projection of the rod 15 from the tubular arm 10 and consequently the position of the rollers on the tape run 106.
  • the just described device permits to vary at will the compression force of the rollers 16 against the tape run 106 in order to adjust same to the requirements of the different fibre kinds, to the different fibre sliver thicknesses and to the drafting ratios, this latter end being attained by adjusting the angular position of the arm 10.
  • the bearing point of the rollers against the tape run 106 may be adjusted by rotating the shaft 22 so as to draw more or less the cords 19 which pull the rod 15 in the direction of the pivot 8 of the tubular arm 10.
  • a sliver draft unit of the kind comprising a pair of endless tapes arranged with their inner runs adjacent and substantially parallel and running in the same direction, between which the sliver to be attenuated passes, the arrangement between the two runs of either of said endless tapes of an arm swinging substantially along the plane of said endless belts and provided with a telescoping part; the corresponding inside belt run carrying at its end pressure means adapted to bear with a certain pressure against spring means urging said telescoping part outwardly; a cord attached by one of its ends to said telescoping means and anchored by its other end to a Patented Mar.
  • control means which is adapted to be operated so-as'to pull said cord and shift said telescoping means in pposition to the said spring means; an extension of the non-telescoping part of said swinging arm'projecting outside of said belt and carrying a pin; a crank pin whose angular position may be adjusted at will and a link hinged by one of its ends to said crank pin and by itsother end to the pin fitted at the end of said arm extension.
  • a sliver draft unit accordingto claim 1 in which the said pressure means comprisea number of rollers rotatably mounted on pivots fitted at the end of said telescoping arm.
  • a sliver draft unit of the type including a pair of endless tapes arranged with their inner runs adjacent and substantially parallel and running in the same direction, the combination of pressure means disposed between the two runs of one of said endless tapes to press the inner run of said one endless tape against the inner run of the other endless tape of the pair, means mounting said pressure means for continuously 'shiftable' movement along the length of said inner tape'run, means supporting said mounting means for movement toward and from said inner tape run for varying the amount of pressure by said pressure means against said inner tape ru'n', said mounting means including carrier means for said pressure means and arm means slidably supporting said carrier means, pivot means mounted between the tape run's and swingably supporting said arm means, means for urging said carrier means relative to said arm means in' one direction, means controlled from the exterior of said unit for moving said carrier means in an opposite direction, and said supporting means comprising control means 3 two runs or one of said endless tapes to press the inner run of said one endless tape against the inner run of the other endless tape of the pair, means mounting

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US646454A 1956-03-15 1957-03-15 Adjustable pressure devices for double endless tape sliver draft units Expired - Lifetime US2926393A (en)

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IT2926393X 1956-03-15

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GB (1) GB828638A (en(2012))

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3001241A (en) * 1957-05-21 1961-09-26 Aymerich Juan Comerma Drafting train on continuous spinning machines
US3918127A (en) * 1973-09-17 1975-11-11 Braschler & Cie Apparatus for blending rovings
US8650718B2 (en) * 2009-03-31 2014-02-18 Ozdilek Ev Tekstil Sanayi Ve Ticaret Anonim Sirketi In yarn production, apron cladding mechanism and method to the rollers coated with elastic material and found in the drafting and guiding zone, having shift structure and pre-tensioning mechanism

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US109430A (en) * 1870-11-22 Improvement in drawing-frames
US2239863A (en) * 1937-10-23 1941-04-29 Spinnfaser Akt Ges Draw frame
US2623346A (en) * 1950-01-16 1952-12-30 Lohfert Helmut Drawing mechanism for spinning machines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US109430A (en) * 1870-11-22 Improvement in drawing-frames
US2239863A (en) * 1937-10-23 1941-04-29 Spinnfaser Akt Ges Draw frame
US2623346A (en) * 1950-01-16 1952-12-30 Lohfert Helmut Drawing mechanism for spinning machines

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3001241A (en) * 1957-05-21 1961-09-26 Aymerich Juan Comerma Drafting train on continuous spinning machines
US3918127A (en) * 1973-09-17 1975-11-11 Braschler & Cie Apparatus for blending rovings
US8650718B2 (en) * 2009-03-31 2014-02-18 Ozdilek Ev Tekstil Sanayi Ve Ticaret Anonim Sirketi In yarn production, apron cladding mechanism and method to the rollers coated with elastic material and found in the drafting and guiding zone, having shift structure and pre-tensioning mechanism

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GB828638A (en(2012))

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