US3682204A - Weaving looms with external weft reserve - Google Patents

Weaving looms with external weft reserve Download PDF

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Publication number
US3682204A
US3682204A US41269A US3682204DA US3682204A US 3682204 A US3682204 A US 3682204A US 41269 A US41269 A US 41269A US 3682204D A US3682204D A US 3682204DA US 3682204 A US3682204 A US 3682204A
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United States
Prior art keywords
tape
strips
guide
toothed
guides
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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
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US41269A
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English (en)
Inventor
Raymond Dewas
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Individual
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Individual
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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
    • 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
    • D03D47/27—Drive or guide mechanisms for weft inserting
    • D03D47/275—Drive mechanisms
    • D03D47/276—Details or arrangement of sprocket wheels

Definitions

  • R. D e was MuJ-svQ ATTO rLN 5%5
  • This invention relates to looms with weft feed by means of bobbins located outside the shed and comprising at least one weft-inserter at one extremity of a flexible ribbon or tape formed by at least two superposed bands or strips and guided in its path outside the shed usually by an upper guide and a lower guide which are connected to each other by means ofv an intermediate curved guide commonly referred-to as a bow, said tape being provided with a reciprocating movement by means of a toothed rotary system which engages perforations forrned in said tape.
  • the superposed formed by the inner. strip has a distinctly greater development than the bottom of the bow and the outermost strip has a development which is-distinctly smaller than the cover of the bow, assuming that the bow is provided with a cover.
  • An object of this invention is to provide a weaving loom comprising a tape transfer device which eliminates the band-brake effect produced by said tape on the bow.
  • At least the tape strip or strips of the tape other than the inner strip are engaged with the toothed rotary system solely in the zones of the upper and lower guides in order that each of said strips should form between the outer extremities of said guides at a distance from said toothed rotary system a loop which floats within the bow unit, the successive strips being engaged over the teeth of the rotary drive system in such manner as to ensure that the perforations formed in the loops of successive strips as considered from the interior towards the exterior should increase in number between two teeth which belong respectively to the two zones.
  • all the strips of the tape are engaged with the toothed rotary system only in the zones of the upper and lower guides and are mounted so that each strip forms between the outer extremities of said guides and at a distance from said toothed rotary system a loop which progresses within the bow unit, the loop formed by the inner strip being located at a distance from the bottom of the bow and the loop of each other strip being located at a distance from the loop of the strip which is located immediately within the interior of the strip due to the fact that the perforations formed in the loops of successive strips as considered from the interior towards the exterior increase in number between two teeth which are located respectively in the two zones.
  • the toothed rotary system is constituted by a single toothed wheel disposed in the plane of the upper and lower guides and of the tape loop.
  • the toothed rotary system is constituted by two synchronized toothed wheels which are in meshing engagement with those portions of the tape which are located respectively in the upper and lower guides.
  • said tape is disposed insofar as the inner strip is concerned in meshing engagement with the toothed wheel over the entire length of the arc of contact.
  • FIG. 1 is a front view showing one of the tapes of a weaving loom with weft feed by means of bobbins located outside the shed as well as the guides and a first form of construction of means for displacing said tape in a reciprocating movement, the front side (with respect to the observer) having been removed
  • FIG. 2 is a partial sectional view on a larger scale and taken along line lI-II of FIG. 1
  • FIG. 3 illustratesa first alternative form of construction
  • FIG. 4 is a view which is similar to that of FIG. 1 and showing another form of construction
  • FIG. 5 shows an alternative fonn of FIG. 1
  • FIG. 6 is a sectional view on a larger scale and taken along line VI-VI of FIG. 5.
  • the weft-insertion control tape 1 as shown in FIG. 1 is made up of two superposed strips 2 and 3 (shown also in FIG. 2) which are joined together only at the front end on which is mounted the weft inserter (not shown).
  • said tape passes through an upper rectilineal and horizontal guide 4 carried by the slay 5, then forms at the exterior a loop extending approximately over a half-circumference and finally passes into a lower rectilineal and horizontal guide 6 so as to be brought back beneath the machine towards the interior of this latter.
  • the tape slides within guide-blocks 7 which are placed immediately after the upper horizontal guide 4.
  • the toothed rotary system for displacing the tape is constituted in this example by a single wheel 8 provided with teeth 9, said wheel being located in the plane of the two guides, namely the upper guide 4 and lower guide 6, and being tangent to these latter.
  • the two strips which constitute the tape are provided with perforations-lo, the dimensions and pitch of which correspond to those of the teeth 9.
  • the wheel 8 is carried by a shaft 11 to which is imparted a reciprocating movement of rotation.
  • An intermediate curved guide or. bow 12 is located in the zoneof that portion of the tape which forrm a loop.
  • Said bow has theshape-of a half-circumference which has the same mean diameter as that of. the toothed wheel 8 but the center of which is displaced horizontally towards the exterior with respect to the axis of the wheel 8 in order that the said bow should be clear of the teeth 9 of said wheel.
  • Said bow has a U-shaped cross-section which can be closed by a detachable cover 13.
  • the progress of the two strips 2 and 3 within the bow unit which is thus formed takes place in a very special manner;
  • the inner strip 2 is located at a distance from the bottom of the bow in'order' to ensure 4 which are identical 'and coupled respectively with the two wheels l4, 15 for displacing the tape.
  • One of the three wheels 16, 17 or 18 is driven in a reciprocating movement of rotation by any suitable means.
  • said strip is displaced with respect to the inner strip by either one or a number of perforations, also in said lower portion of the wheel, in order that said outer strip should be separated from said inner strip as it passes through the bow unit.
  • the radial depth of the bow unit must be sufficient to ensure that the outer strip 3 cannot be forcibly applied against the eccentric cover 13 of said bow unit.
  • the upper and lower portions of the toothed driving wheel 8 which are engaged in the corresponding upper guide 4 and lower guide 6 are in mesh with the perforations 10 of the tape and impart a reciprocating movement to this latter.
  • the rectilineal portions of the'two superposed strips are not in rubbing or frictional contact with each other since they move exactly atthe same speed; in addition, the looped 'portions of the strips which are located within the bow unit are not in frictional contact since they are well between said wheel'and the bow 12 is greater with the result that the radius of the bow can remain sufficiently long, thereby obviating the need for a radius of curvature of the strips which might proveunsuitable for their particular structure.
  • the lower guide 6 is accordingly inclined upwards and towards the interior of the machine in order to remain tangent to the wheel 8 and the bow 12.
  • the portion l9 of-the lower guide 6 which immediately follows the wheel 8's not rectilineal but has a very substantial radius of curvature, with the result that friction between the strips as'well as friction between the strips and said guide are negligible, particularly due to the fact-that portion'of the tape is not subjected to the influence of inertia of theweft-insetter.
  • the inner strip 20f the tape which, in this example, is constituted by two superposed strips 2 and 3, is engaged with the toothedwheel 8 not only in the zone of the upper guide4 and in the zone of the lower guide 6 but over the entire lenghtv of the arc of-contact' between said wheel and said tape, namely over a half-circumference in this example.
  • the outer strip 3 is engaged with the toothed wheel 8 only in the zones of said guides (see also FIG. 6).
  • the number of perforations between two 3 wheel teeth located respectively, in the zones of the upper guide 4 and lower guide 6 is greater in the case of the strip 3 than in the case of the band 2.
  • Reference 0 designates the center of the bow 12
  • reference 01 designates the center of the outer strip 3 of the tape
  • 02 designates the center of the cover 13.
  • a guide for a weft inserting control tape said tape consisting of at least two flexible super imposed perforated strips, all perforations being equally spaced longitudinally said strips, an upper guide for said tape having an outer end, a lower guide for said tape located under said upper guide and having an outer end, said tape extending through the lower guide, beyond the outer end thereof, into and through the upper guide, forming an outwardly flexed loop composed of an inner strip portion and an outer strip portion between said guides, a toothed rotary system having teeth in engagement with the perforations of each of said strips and located in the vicinity of the outer ends of said guides for reciprocating the tape, the outer strip portion having at least one more perforation in the loop portion thereof than does the inner strip portion.
  • toothed rotary system is constituted by two toothed wheels which are respectively engaged with those portions of the tape which are located respectively within the upper and lower guides, said two wheels being coupled with each other, by positive transmission means.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US41269A 1969-06-02 1970-05-28 Weaving looms with external weft reserve Expired - Lifetime US3682204A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU58761 1969-06-02
LU59329 1969-08-21

Publications (1)

Publication Number Publication Date
US3682204A true US3682204A (en) 1972-08-08

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US41269A Expired - Lifetime US3682204A (en) 1969-06-02 1970-05-28 Weaving looms with external weft reserve

Country Status (8)

Country Link
US (1) US3682204A (enrdf_load_stackoverflow)
JP (1) JPS4828030B1 (enrdf_load_stackoverflow)
AT (1) AT308021B (enrdf_load_stackoverflow)
CH (1) CH514009A (enrdf_load_stackoverflow)
ES (1) ES380955A1 (enrdf_load_stackoverflow)
FR (1) FR2048986A5 (enrdf_load_stackoverflow)
GB (1) GB1267003A (enrdf_load_stackoverflow)
NL (1) NL147199B (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3916957A (en) * 1973-08-13 1975-11-04 Raymond Dewas Tape drive in weaving machines
US4771815A (en) * 1986-07-15 1988-09-20 Sulzer Brothers Limited Apparatus for weft insertion in a ribbon gripper loom
US4977932A (en) * 1988-09-08 1990-12-18 Vamatex S.P.A. Edge guide for weft gripper belt

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3328889A1 (de) * 1983-08-10 1985-02-28 Hörmann KG Antriebs- und Steuerungstechnik, 4834 Harsewinkel Geraet zur ueberfuehrung einer rotatorischen in eine translatorische bewegung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2548662A (en) * 1946-03-01 1951-04-10 Crompton & Knowles Loom Works Weft needle mechanism for axminster looms
US3402746A (en) * 1966-06-02 1968-09-24 Dewas Raymond Weft insertion needles in weaving machines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2548662A (en) * 1946-03-01 1951-04-10 Crompton & Knowles Loom Works Weft needle mechanism for axminster looms
US3402746A (en) * 1966-06-02 1968-09-24 Dewas Raymond Weft insertion needles in weaving machines

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3916957A (en) * 1973-08-13 1975-11-04 Raymond Dewas Tape drive in weaving machines
US4771815A (en) * 1986-07-15 1988-09-20 Sulzer Brothers Limited Apparatus for weft insertion in a ribbon gripper loom
US4977932A (en) * 1988-09-08 1990-12-18 Vamatex S.P.A. Edge guide for weft gripper belt

Also Published As

Publication number Publication date
ES380955A1 (es) 1973-04-01
NL7007972A (enrdf_load_stackoverflow) 1970-12-04
GB1267003A (enrdf_load_stackoverflow) 1972-03-15
FR2048986A5 (enrdf_load_stackoverflow) 1971-03-19
JPS4828030B1 (enrdf_load_stackoverflow) 1973-08-28
NL147199B (nl) 1975-09-15
CH514009A (fr) 1971-10-15
DE2027000A1 (de) 1970-12-17
AT308021B (de) 1973-06-25

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