US3741258A - Gripper shuttle - Google Patents

Gripper shuttle Download PDF

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Publication number
US3741258A
US3741258A US00177352A US3741258DA US3741258A US 3741258 A US3741258 A US 3741258A US 00177352 A US00177352 A US 00177352A US 3741258D A US3741258D A US 3741258DA US 3741258 A US3741258 A US 3741258A
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US
United States
Prior art keywords
gripper
spur
spring
hollow
flat
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
US00177352A
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English (en)
Inventor
V Svaty
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.)
Elitex Zavody Textilniho
Original Assignee
Elitex Zavody Textilniho
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Elitex Zavody Textilniho filed Critical Elitex Zavody Textilniho
Application granted granted Critical
Publication of US3741258A publication Critical patent/US3741258A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03J—AUXILIARY WEAVING APPARATUS; WEAVERS' TOOLS; SHUTTLES
    • D03J5/00—Shuttles
    • D03J5/06—Dummy shuttles; Gripper shuttles

Definitions

  • ABSTRACT 30 F A u H P i n D
  • This invention relates to a gripper shuttle for the insertion of weft threads. More particularly, the invention relates to a weft shuttle of the gripper type which is guided through the shed by a system of guiding seg ments and reed dents.
  • Known types of grippers shuttles for weft thread insertion particularly those with unilaterally arranged gripping mechanisms generally consist of a hollow body having at least one resilient means disposed in the hollow of the body which grips the weft thread in the course of movement of the shuttle through an intermediate lever or similar means controlled from the gripper per se.
  • the weft thread is generally fed into the gripping mechanism by a guiding needle with or without the use of other opening means. This is normally accomplished before beginning the insertion of the weft thread into the shed.
  • the resilient means are fastened in the hollow of the gripper with fasteners such as rivets, screws or simi lar means or is inserted in the hollow in a shrunken biased condition and then held there only by friction due to their subsequent expansion.
  • One type of known weft gripper or gripper shuttle is provided with a flat spring that is held in the hollow body by means of a stationary spur provided at one end of the body, the spring bearing against the inner side of the spur and all of which elements together constitute the gripping mechanism.
  • a gripper of this type is guided in the course of its movement through the shed by a system of guiding segments which are arranged on the batten and by the reed dents which slide over the sliding surface of the gripper.
  • the weft shuttle is generally guided by a rib arranged on the hollow body, the rib serving also as a bumper absorbing the shock upon ejection or upon braking of the shuttle.
  • FIG. 1 is a plan view of a gripper according to the invention
  • FIG. 2 is an elevational view of the gripper shown in FIG. 1;
  • FIG. 3 is a plan view of the body of the device shown in FIG. 1;
  • FIG. 3a is a sectional view of the body shown in FIG. 3 and taken from the rear;
  • FIG. 4' is a view in elevation and partially in section of the body shown in FIG. 3;
  • FIG. 5 is a view in perspective of the elements inserted in the body hollow, including the flat beam provided with a spur and the flat spring affixed thereto;
  • FIG. 6 is a sectional view in elevation of alternative embodiment of a gripper according to the invention showing in detail the disposition of the elements inserted in the body hollow and a variation of the arrangement of the relationship for affixing the flat beam and flat spring to each other;
  • FIG. 7 is a plan view of the elements shown in FIG. 6 which are inserted in the body hollow;
  • FIG. 8 is a view in perspective of the elements shown in FIG. 7;
  • FIG. 9 is a view in elevation of the elements to be inserted in the body hollow in a one-piece configuration.
  • FIG. 10 is a plan view of the one-piece element shown in FIG. 9.
  • a gripper or gripper inserter in accordance with the invention comprising a plastic body having a hollow portion and elements including a flat beam provided with a spur and reverse tips and having a flat spring fixed thereto, all of which are disposed in the body hollow.
  • a gripper in accordance with the invention comprises a body I made of light weight, structurally firm, non-metallic or plastic, material.
  • the body may be simply moulded in one piece of any suitable plastic which provides a surface having a low coefficient of friction such as, for example, DELRIN.
  • the body is provided with a closed tip 2 and a longitudinal hollow 3 in boatlike fashion.
  • the hollow has a cross-section in the form of a flat T as shown more precisely in FIG. 3a.
  • the body is also provided with a sliding upper surface 4 which slides on the dents of a reed of a loom in a conventional manner.
  • the body also has a rib 5 along its lower surface which guides it through the shed in cooperation with guiding segments mounted on a conventional batten.
  • Inserted in the hollow 3 of the body is an assembly of elements generally made of metal such as steel including a flat beam 6 provided with a vertical spur 7 and a flat spring 8 fixed to the beam by connecting elements 9, such as rivets or other suitable fastening means at the end opposite the spur, as illustrated more fully in FIG. 5.
  • a flat member 10 is fixedly interposed between the beam 6 and the spring 8 so that the spring can be moved or deviated when inserting a weft thread (not shown) between the spur 7 and the free end 11 of the flat spring.
  • Member 10 also allows adjustment of the space between flat spring and flat beam so'that, when assembled, the whole unit snugly fits into and fills the front part of the hollow 3 of the body as shown in FIG 6.
  • the assembled elements are secured, after insertion in the hollow 3, by providing reverse tips or barbs 12 located on both lateral edges of the beam 6.
  • the barbs 12 press against the inner walls of the body 1. Insertion of the assembled elements into the hollow of the barbs is possible since, being made of plastic, the body is somewhat elastic. On the other hand, removal from the hollow requires force and cannot be done without seriously damaging the body. In view of the negligible cost of the plastic body, damage to the body on removing the assembly from the hollow is not serious, and it can be easily replaced. If desirable, the assembly can also be fixed in the hollow with fasteners such as screws, rivets and similar means (not shown).
  • An alternative embodiment of the gripper of this invention involves modification of the beam, spring and spur as shown more particularly in FIGS. 7 and 8 at the point where the spring contacts the spur of the beam.
  • the gripper of this invention presents many advantages.
  • the light weight, structurally strong plastic body having surfaces exhibiting a low coefficient of friction is easily manufactured by known plastic moulding processes and does not readily damage the reed dents of looms on which it is employed.
  • it is relatively inexpensive to make and the assembly of elements to be inserted in the hollow of the body can be easily placed therein without the use of additional fastening means and removed therefrom for use in replacement bodies of plastic.
  • a gripper shuttle for the insertion of weft threads in a loom comprising a plastic body having a longitudinal hollow therein and a thread holding assembly inserted within said hollow said assembly comprising a flat beam provided with a spur at one end, a flat spring fixed to said beam at the end opposite said spur,extending therealong and spaced in part from said beam, said spur and the open end of said spring forming a gripping surface for weft threads to be guided through the shed of said weaving loom, the spring being resiliently movable with respect to said beam to permit said spring to separate from said spur to permit entry of a thread therein.
  • the gripper according to claim 1 including means for securing said beam to the body.
  • said securing means comprises a plurality of barbs arranged along the edges of said beam, said barbs being engageable with the plastic body.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US00177352A 1970-09-04 1971-09-02 Gripper shuttle Expired - Lifetime US3741258A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS6076A CS149355B1 (cs) 1970-09-04 1970-09-04

Publications (1)

Publication Number Publication Date
US3741258A true US3741258A (en) 1973-06-26

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ID=5406978

Family Applications (1)

Application Number Title Priority Date Filing Date
US00177352A Expired - Lifetime US3741258A (en) 1970-09-04 1971-09-02 Gripper shuttle

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US (1) US3741258A (cs)
CS (1) CS149355B1 (cs)
DE (1) DE2135593A1 (cs)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3853152A (en) * 1972-07-10 1974-12-10 Sulzer Ag Gripper shuttle for weft threads in a loom
US4029130A (en) * 1974-09-23 1977-06-14 Albatex A.G. Weft yarn gripping element for looms

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3853152A (en) * 1972-07-10 1974-12-10 Sulzer Ag Gripper shuttle for weft threads in a loom
US4029130A (en) * 1974-09-23 1977-06-14 Albatex A.G. Weft yarn gripping element for looms

Also Published As

Publication number Publication date
DE2135593A1 (de) 1972-03-09
CS149355B1 (cs) 1973-07-05

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