US3834425A - Double hooks for double-lift open-shed jacquard - Google Patents

Double hooks for double-lift open-shed jacquard Download PDF

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Publication number
US3834425A
US3834425A US00340905A US34090573A US3834425A US 3834425 A US3834425 A US 3834425A US 00340905 A US00340905 A US 00340905A US 34090573 A US34090573 A US 34090573A US 3834425 A US3834425 A US 3834425A
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United States
Prior art keywords
hook
branch
catch
plane
double
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Expired - Lifetime
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US00340905A
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English (en)
Inventor
R Neyraud
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Staeubli Verdol SA
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Verdol SA
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C3/00—Jacquards
    • D03C3/24—Features common to jacquards of different types

Definitions

  • the present invention relates to hooks for the jacquards associated with looms.
  • Modern jacquards generally comprise two movable knife frames or griffes which are reciprocated vertically in opposed directions and each hook is realized under double form with two branches by means of a steel wire folded at 180,the free end of each branch being bent in the form of a downwardly directed beak for cooperation with one of the movable griffes.
  • One of the branches has a catch which is located above a stationary open-shed griffe when the hook is at the raised position. If the hook is to remain raised at the next weft stroke this catch is retained by the stationary griffe. But if on the contrary the hook should be lowered, it is pushed back by the corresponding needle in order that the catch may escape the stationary griffe.
  • the catches are generally welded to one branch of each hook along one of the two generatrices of the wire which are located in the mean longitudinal plane thereof, i.e. in the plane of flexion of the branch.
  • the stationary open-shed griffe is usually situated just below the needles and therefore each catch is welded to the corresponding branch near the point thereof where the bending stresses are at a maximum. This results in a relatively rapid fatigue of the steel in the zone of the weld.
  • the wire becomes brittle and sometimes breaks during operation of the jacquard.
  • the openshed catch is disposed substantially laterally against the corresponding branch of the hook and it is welded thereto substantially along a generatrix situated in a radial plane perpendicular to the plane of flexion of the said branch, i.e. in the neutral plane of the branch with respect to the deflections thereof.
  • FIG. 1 is a side view of a double hook according to the present invention in a double-lift open-shed jacquard of which only the movable bars and the stationary bar which correspond to this hook are illustrated in cross-section.
  • FIG. 2 is an enlarged fragmental perspective view showing the open-shed catch laterally secured to one of downwardly to form beaks, respectively 2a, 3a.
  • the lower portion 4 of the hook which connects branches 2 and 3 with each other is directed obliquely and it supports a cord 5 of the loom harness.
  • Reference numerals 6 and 7 designate the bars of the vertically movable griffes which correspond to hook I. At the position illustrated hook I has been raised by bar 7 acting on beak 3a.
  • An open-shed catch 8 is secured to branch 3 in the central portion thereof. At the raised position of book 1 this catch is situated just above a bar 9 of a stationary open-shed griffe. At the beginning of the descending stroke of bar 7 catch 8 is retained by bar 9 if hook I is to remain raised for the next weft of the loom. If on the contrary hook 1 is to be lowered, the corresponding needle (not illustrated) deflects branch 3 as indicated at F to such an extent as to bring same to the position shown in dash and dot lines, for which catch 8 may pass freely in front of bar 9 without hindering the descending motion of hook I.
  • the open-shed catch 8 is directly welded by its rear edge to the concave side, or in other words along a generatrix situated in the mean longitudinal plane of the hook, i.e. in the plane of flexion. The weld tends to concentrate the stresses and theresulting fatigue may cause breakage of the wire in the vicinity of the catch.
  • the catch 8 if formed of a planar flat member having approximately the shape of a rightangled trapezium with its parallel sides perpendicular to the axis of branch 3.
  • the vertical side is centrally notched to define two lugs 8a, 8b.
  • the lower side which is slightly inclined downwardly starting from the notched vertical side, forms the resting surface adapted to rest on the open-shed bar 9 while the oblique side 8d imparts to the catch the ratchet tooth profile desired.
  • Catch 8 is disposed laterally against branch 3 in a plane parallel to the mean longitudinal plane of the hook and lugs 8a, 8b are point-welded to the said branch at 11 and 12 along a generatrix situated in a plane radial to the branch and perpendicular to the general longitudinal plane of the hook i.e. to the plane of flexion of branch 3. Points 11 and 12 are therefore situated in the neutral plane of the branch, i.e. in the zone unaffected by the bending stresses and they cannot cause any fatigue in the metal of the branch.
  • the catch 18 is more or less S-shaped in horizontal section in order that the portion of its lower edge adapted to bear on bar 9 may be situated in the mean longitudinal plane of the hook.
  • a somewhat similar result may be obtained by disposing catch 28 and its oblique side 28d at a small angle with respect to the said mean longitudinal plane as illustrated in FIG. 5. In such an embodiment points 11 and 12 nevertheless remain close to the neutral plane of the branch.
  • the catch 38 is U-shaped in horizontal section and the two straight portions l3, 14 thus formed, each of which may be similar to the catch of FIG. 2, is laterally point-welded to branch 3.
  • a double hook for a double-lift open-shed jacquard comprising two resilient branches one of which has an open-shed catch welded thereto, said catch having a protruding nose adapted to rest on an open-shed branch, with said one branch being submitted during operation of the jacquard to deflections which determine a neutral plane in said one branch, said neutral plane including two generatrices of said one branch, the improvement which consists in said catch being welded laterally to said one branch substantially along at least one of said two generatrices.
  • said hook having a mean longitudinal plane and said catch being in the form of a substantially flat planar member disposed laterally of said hook against said one branch and extending in a plane spaced from but substantially parallel to the mean longitudinal plane of said hook.
  • said hook having a mean longitudinal plane and said catch being in the form of a substantially flat member folded twice to S- shape in a plane perpendicular to said one branch to determine a first portion disposed laterally of siad hook against said one branch and a second portion extending substantially in the mean longitudinal plane of said hook to form said protruding nose.
  • said hook having a mean longitudinal plane and said catch being in the form of a substantially flat planar member disposed against said one branch at an angle to the mean longitudinal plane of said hook.
  • said catch being in the form of a substantially flat member folded to U- shape in a plane perpendicular to said one branch to form two parallel portions disposed each side of said branch and each welded to said one branch along one of said generatrices.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Looms (AREA)
US00340905A 1972-03-27 1973-03-13 Double hooks for double-lift open-shed jacquard Expired - Lifetime US3834425A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7211156A FR2177565B1 (US20100223739A1-20100909-C00025.png) 1972-03-27 1972-03-27

Publications (1)

Publication Number Publication Date
US3834425A true US3834425A (en) 1974-09-10

Family

ID=9096052

Family Applications (1)

Application Number Title Priority Date Filing Date
US00340905A Expired - Lifetime US3834425A (en) 1972-03-27 1973-03-13 Double hooks for double-lift open-shed jacquard

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Country Link
US (1) US3834425A (US20100223739A1-20100909-C00025.png)
JP (1) JPS5723010B2 (US20100223739A1-20100909-C00025.png)
DE (1) DE2314603C3 (US20100223739A1-20100909-C00025.png)
FR (1) FR2177565B1 (US20100223739A1-20100909-C00025.png)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2700986C2 (de) * 1977-01-12 1978-10-19 Maschinenfabrik Carl Zangs Ag, 4150 Krefeld Ganzoffenfach-Fachbildemaschine für Webmaschinen

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US838279A (en) * 1905-06-19 1906-12-11 Rueti Ag Maschf Double-lift open-shed jacquard-machine.
US900948A (en) * 1907-11-20 1908-10-13 Marie Antoinette Perrin Jacquard mechanism.
CH44204A (fr) * 1908-06-26 1909-07-16 Marie Antoinette Perrin Mécanique Jacquaerd
US2701585A (en) * 1953-01-30 1955-02-08 Mecaniques Verdol Soc D Jacquard for weaving looms
FR1517985A (fr) * 1967-01-31 1968-03-22 Mecaniques Verdol Soc D Perfectionnements aux crochets à trois becs pour les mécaniques jacquard des métiers à tisser
CH460658A (de) * 1966-07-08 1968-07-31 Zangs Ag Maschf Einrichtung zum Führen der Platinen einer Jacquardmaschine
US3480044A (en) * 1967-02-28 1969-11-25 Mecaniques Verdol Soc Double-lift jacquards operating with reverse selection

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1122037A (fr) * 1955-02-10 1956-08-30 Samuel Dracup And Sons Ltd Mécanique jacquard perfectionnée
JPS5320856B2 (US20100223739A1-20100909-C00025.png) * 1971-08-27 1978-06-29

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US838279A (en) * 1905-06-19 1906-12-11 Rueti Ag Maschf Double-lift open-shed jacquard-machine.
US900948A (en) * 1907-11-20 1908-10-13 Marie Antoinette Perrin Jacquard mechanism.
CH44204A (fr) * 1908-06-26 1909-07-16 Marie Antoinette Perrin Mécanique Jacquaerd
US2701585A (en) * 1953-01-30 1955-02-08 Mecaniques Verdol Soc D Jacquard for weaving looms
CH460658A (de) * 1966-07-08 1968-07-31 Zangs Ag Maschf Einrichtung zum Führen der Platinen einer Jacquardmaschine
FR1517985A (fr) * 1967-01-31 1968-03-22 Mecaniques Verdol Soc D Perfectionnements aux crochets à trois becs pour les mécaniques jacquard des métiers à tisser
US3480044A (en) * 1967-02-28 1969-11-25 Mecaniques Verdol Soc Double-lift jacquards operating with reverse selection

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
1,909,333, 10 10 1970, Ger. Application (Kenk). *

Also Published As

Publication number Publication date
DE2314603B2 (de) 1981-07-02
FR2177565B1 (US20100223739A1-20100909-C00025.png) 1976-06-11
JPS5723010B2 (US20100223739A1-20100909-C00025.png) 1982-05-17
DE2314603C3 (de) 1982-03-04
DE2314603A1 (de) 1973-10-11
JPS496246A (US20100223739A1-20100909-C00025.png) 1974-01-19
FR2177565A1 (US20100223739A1-20100909-C00025.png) 1973-11-09

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