US3688807A - Weft drawing gripper for looms - Google Patents

Weft drawing gripper for looms Download PDF

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Publication number
US3688807A
US3688807A US33286A US3688807DA US3688807A US 3688807 A US3688807 A US 3688807A US 33286 A US33286 A US 33286A US 3688807D A US3688807D A US 3688807DA US 3688807 A US3688807 A US 3688807A
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US
United States
Prior art keywords
gripper
lower branch
weft
end portion
covering
Prior art date
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
Application number
US33286A
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English (en)
Inventor
Andrea Parolini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Promatech SpA
Original Assignee
SOMET Societa Meccanica Tessile SpA
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Filing date
Publication date
Application filed by SOMET Societa Meccanica Tessile SpA filed Critical SOMET Societa Meccanica Tessile SpA
Application granted granted Critical
Publication of US3688807A publication Critical patent/US3688807A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • D03D47/20—Constructional features of the thread-engaging device on the inserters
    • D03D47/23—Thread grippers
    • D03D47/236—Drawing grippers

Definitions

  • Jaudon Attorney-Young & Thompson ABSTRACT In a continuous weft supply loom wherein a pair of reciprocating weft-carrying grippers-one feeding and one drawing gripper-insert the weft in the warp shed, exchanging weft yarns at the center of the shed, the drawing gripper has a branch with a small raised end portion engaged by an oscillating arm for locking the weft, and a thin metal covering is applied to the surface of said raised end portion of the branch, said covering extending in the shape of a cantilever lamina for a short length along and above the non-raised portion of the branch.
  • This invention relates to an improved drawing gripper for such looms, namely to a gripper which grasps the weft yarn at the center of the shed, taking it away from the feeding gripper which has carried the thread thereto, and draws the thread outside the shed leaving it there.
  • the gripper according to this invention is of the type comprising a stiff gripper body provided with an elongated lower branch having a small raised end portion onto which is urged in elastic engagement, for locking the weft yarn, an oscillating metallic arm which is also stiff and has a hook end for grasping the weft yarn.
  • the invention provides for a drawing gripper of the type described above, characterized in that to the small raised end portion of the gripper lower branch is applied a thin metal covering on its surface of engagement with the oscillating hook arm, said covering extending in the shape of a cantilever lamina for a short length along and above the non-raised portion of the branch.
  • the metal covering is provided at one end with a square tailpiece for its connection to the end of the gripper lower branch.
  • FIG. 1 is a general side view of the drawing gripper according to the invention
  • FIG. 2 is an enlarged side view of the end of the same gripper with the oscillating element raised, of which FIG. 3 is an enlarged partial view from the top with the oscillating element broken away;
  • FIG. 4 is a perspective view, according to the arrow IV of FIG. 3, of the end portion of the lower branch of the drawing gripper according to the invention and of its metal covering.
  • the drawing gripper comprises a gripper body 1 of known configuration comprising a horizontal base portion 1' and an upright portion 2 at the far side of the base portion 1 as seen in FIG. 1.
  • Base portion 1' is extended forwardly by a horizontally extending portion 1" that terminates forwardly in a horizontal lower branch 3.
  • Branch 3 at its end which appears as the left end in FIGS. 1 and 2, terminates in a small raised end portion 7 whose upper surface is above the level of the rest of the upper surface of lower branch 3.
  • Upright portion 2 is forwardly extended by a further upright portion 2 and a still further upright portion 2" that terminates forwardly in a protecting member 8 (see FIG. 3).
  • a generally horizontally extending metal arm 5 Pivoted at its rear end to the rear of portion 2, for vertical swinging movement about a horizontal axle 4, is a generally horizontally extending metal arm 5.
  • Arm 5 terminates at its free end, which is the left end seen in FIGS. 1 and 2, in a hook 6 comprising a portion that rises from the end of arm 5 and then extends laterally as seen in FIG. 3 and then rearwardly above branch 3 to the rear or right end of the hook as seen in FIGS. 1 and 2.
  • the portion of hook 6 that thus extends rearwardly above branch 3 receives between itself and branch 3 the weft yarn as seen in FIG. 2.
  • Spring means acts on arm 5 continuously to urge arm 5 toward lower branch 3 thereby releasably to engage arm 5 with lower branch 3 to hold the weft yarn between them.
  • Cam means (not shown) are provided in the path of the drawing gripper to swing arm 5 from the FIG. 1 position to the FIG. 2 position to release the yarn at an appropriate point in the path of movement of the gripper.
  • the end of the branch 3 is formed with its small raised portion 7 provided with a metal covering 9 having a portion thereof extending in the shape of a cantilever lamina 10 for a short length along and above the non-raised portion of the branch 3.
  • the covering 9 comprises a flat, thin covering, being applied on the engaging surface of the small raised portion 7 of the branch 3, so as to project with its lamina l0, and a square tailpiece 11. The weft yarn is thus grasped between hook 6 and lamina 10, as will be evident from a comparison of FIGS. 1, 2 and 3.
  • the lamina 10 of the covering 9 according to the invention is slightly arch-shaped on its side facing the protecting member 8, thereby to have reduced thickness compared to the widest portion of the covering itself (see FIG. 3).
  • the tailpiece 11 contacts the inner side 12 of the end of branch 3 and serves to fix the covering 9 by means of protuberances or further bent portions of the tailpiece 1 1 itself incorporated into the plastic material forming the branch.
  • the lamina 10 terminates in a tip portion 13 bent towards the protecting member 8 and slanting towards the branch 3, which can be provided, in correspondence of the tip 13 itself, with a notch 14 for housing the same in the event of severe stress and deformation of the lamina 10.
  • the drawing gripper can handle, even at a high loom speed, yarns with very low counts and delicate yarns in general, without having to reduce the speed of the loom on which the gripper is mounted and without frequent breaking of the threads taking place.
  • the reason for this is to be found in the fact that with this arrangement a very smooth and progressive engagement of the thread grasped by the drawing gripper is obtained, this engagement being fovored by the invitation offered by the bent slanting tip 13.
  • a drawing gripper for carrying weft yarns in stationary weft supply looms, comprising a rigid gripper body having an elongated lower branch having a small raised end portion, a rigid oscillating arm, means mounting said arm for oscillation into and out of engagement with said raised portion, said arm being resiliently urged into engagement with said raised end portion, said oscillating arm having a hook end for receiving a weft yarn; the improvement comprising a thin metal covering on the surface of engagement of said raised end portion with said oscillating arm, said covering having a portion thereof extending in the shape of a cantilever lamina beyond said raised portion for a short distance along and above said lower branch.
  • a drawing gripper as claimed in claim 1 said metal covering having at one end a square tail piece of greater thickness than the rest of said covering for connecting said covering to said lower branch.
  • a drawing gripper as claimed in claim 3 and a recess in said lower branch in registry with said inclined end portion to receive said inclined end portion.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US33286A 1969-04-30 1970-04-30 Weft drawing gripper for looms Expired - Lifetime US3688807A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1626269 1969-04-30

Publications (1)

Publication Number Publication Date
US3688807A true US3688807A (en) 1972-09-05

Family

ID=11148656

Family Applications (1)

Application Number Title Priority Date Filing Date
US33286A Expired - Lifetime US3688807A (en) 1969-04-30 1970-04-30 Weft drawing gripper for looms

Country Status (8)

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US (1) US3688807A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
BE (1) BE749719A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CA (1) CA918541A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CH (1) CH502460A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
ES (1) ES186800Y (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2040443A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1314086A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (1) NL167739C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3776281A (en) * 1972-05-24 1973-12-04 Rockwell International Corp Weft carrier for shuttleless looms
US4708174A (en) * 1985-04-09 1987-11-24 N.V. Weefautomaten Picanol Weft gripper for weaving machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1447861A (en) * 1972-08-31 1976-09-02 Mackie & Sons Ltd J Looms and weft inserters therefor
FR2510622A1 (fr) * 1981-07-28 1983-02-04 Alsacienne Constr Meca Pince de sortie pour l'insertion de la trame dans la foule d'une machine a tisser sans navette

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2813548A (en) * 1954-06-16 1957-11-19 Dewas Raymond Weft-inserting devices for weaving looms
US3137321A (en) * 1962-02-12 1964-06-16 Seydoux Et Michau Ets Weft end tucking means
US3390707A (en) * 1965-05-20 1968-07-02 Nuovo Pignone Spa Weft-carrying mechanism for weaving looms having a continuous weftsupply mechanism
CH482852A (it) * 1967-09-19 1969-12-15 Somet Soc Mec Tessile Coppia di pinze di trasporto della trama per telai di tessitura ad alimentazione continua della trama

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2813548A (en) * 1954-06-16 1957-11-19 Dewas Raymond Weft-inserting devices for weaving looms
US3137321A (en) * 1962-02-12 1964-06-16 Seydoux Et Michau Ets Weft end tucking means
US3390707A (en) * 1965-05-20 1968-07-02 Nuovo Pignone Spa Weft-carrying mechanism for weaving looms having a continuous weftsupply mechanism
CH482852A (it) * 1967-09-19 1969-12-15 Somet Soc Mec Tessile Coppia di pinze di trasporto della trama per telai di tessitura ad alimentazione continua della trama

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3776281A (en) * 1972-05-24 1973-12-04 Rockwell International Corp Weft carrier for shuttleless looms
US4708174A (en) * 1985-04-09 1987-11-24 N.V. Weefautomaten Picanol Weft gripper for weaving machine

Also Published As

Publication number Publication date
DE2020879B2 (de) 1976-04-22
DE2020879A1 (de) 1970-11-05
NL167739C (nl) 1982-01-18
FR2040443A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1971-01-22
GB1314086A (en) 1973-04-18
CH502460A (it) 1971-01-31
NL167739B (nl) 1981-08-17
CA918541A (en) 1973-01-09
NL7006303A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1970-11-03
BE749719A (fr) 1970-10-01
ES186800Y (es) 1974-08-01
ES186800U (es) 1973-11-16

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