EP0657569A1 - Griffe d'amenée pour métiers à tisser - Google Patents

Griffe d'amenée pour métiers à tisser Download PDF

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Publication number
EP0657569A1
EP0657569A1 EP94116850A EP94116850A EP0657569A1 EP 0657569 A1 EP0657569 A1 EP 0657569A1 EP 94116850 A EP94116850 A EP 94116850A EP 94116850 A EP94116850 A EP 94116850A EP 0657569 A1 EP0657569 A1 EP 0657569A1
Authority
EP
European Patent Office
Prior art keywords
gripper
yarn
carrying
seat
carrying gripper
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.)
Withdrawn
Application number
EP94116850A
Other languages
German (de)
English (en)
Inventor
Carlo Bonacina
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.)
Interpatents Ltd
INTERPATENT Ltd
Original Assignee
Interpatents Ltd
INTERPATENT Ltd
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 Interpatents Ltd, INTERPATENT Ltd filed Critical Interpatents Ltd
Publication of EP0657569A1 publication Critical patent/EP0657569A1/fr
Withdrawn legal-status Critical Current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
    • D03D47/233—Carrying grippers

Definitions

  • the present invention relates to a carrying gripper for looms.
  • the weft yarn is inserted inside the shed, formed by the heddles, using a carrying and a drawing gripper, which travel back and forth inside the shed in a crosswise direction to the warp yarns; the carrying gripper picking up the weft yarn from the reel and carrying it roughly halfway along the shed to the so-called "exchange point", and a hook portion of the drawing gripper picking up the yarn from the carrying gripper at the exchange point and drawing it to the end of the shed where it is released from the drawing gripper.
  • the carrying gripper is elongated in shape and presents, on one longitudinal side, a seat for deflecting the yarn wound off the reel, and, on the other longitudinal side, a gripping element for retaining the yarn as the carrying gripper travels from one end of the loom to the exchange point.
  • the yarn therefore extends crosswise to the carrying gripper, and, as the gripper travels along the shed, the yarn extends substantially lengthwise of the gripper between this and the reel, and is deflected by said seat to the gripping element in a crosswise direction to the gripper to enable it to be picked up by the drawing gripper at the exchange point.
  • the yarn portion between the deflecting seat and the gripping element must be maintained sufficiently straight and taut at all times.
  • the tension of the yarn slackens, however, due to inversion of the carrying gripper or other reasons, the yarn slips out of the seat and normally assumes a compressed, e.g. coiled, configuration.
  • the yarn portion between the reel and the gripper continues traveling by force of inertia, thus impairing the straightness and hence correct engagement by the drawing gripper of the crosswise portion of the yarn.
  • Yarn exchange is especially critical on modern looms in view of the high output rates and operating speeds involved.
  • a brake is currently provided downstream from the reel, for tensioning and keeping the yarn taut in the correct exchange position.
  • Such constant tensioning of the yarn results in added stress and increases the likelihood of the yarn breaking.
  • a carrying gripper for looms comprising a gripper body in turn presenting, on one side, a seat for a weft yarn, and, on the opposite side, a gripping element for maintaining crosswise to said gripper body the weft yarn portion extending between said seat and said gripping element; characterized in that said seat is defined, in the traveling direction of said carrying gripper, by an edge having a tangent crosswise to the direction of the yarn upstream from the carrying gripper.
  • the edge defining the seat is perpendicular to the direction of the yarn upstream from the carrying gripper, so as to form a stop for arresting the yarn as it increases in length by force of inertia upon sharp deceleration of the carrying gripper and in particular when the yarn is exchanged.
  • the seat is located at the end of a shaped recess in a tab on the gripper body, the recess presenting an inlet portion and a curved portion narrowing from the inlet portion towards the yarn deflecting seat.
  • the tab is formed by a projecting sheet metal portion of the gripper body, which is so bent that a guide portion, whose bottom edge defines the curved portion of the recess, projects downwards and outwards of the carrying gripper.
  • the bottom edge of the guide portion is so oriented as to feed the yarn towards the inlet of the hook portion of the drawing gripper even in the event of the yarn so increasing in length as to slip out of the deflecting seat and along the guide portion.
  • Number 1 in Figures 1 to 3 indicates a carrying gripper for a known loom (not shown) and designed to cooperate with a drawing gripper 2.
  • Carrying gripper 1 comprises an elongated gripper body 3 formed by blanking and bending sheet metal and which, close to one end 4, presents a yarn deflecting seat 5 and a gripping element 6.
  • gripper body 3 presents a curved tab 7 projecting from bottom 15 of the gripper and bent upwards at roughly a right angle (Figure 5 section).
  • Tab 7 presents a recess 8 forming seat 5, and, according to the present invention, recess 8 is so shaped as to define a wide lead-in portion 9 for assisting initial pickup of yarn 11 close to the end of the loom (not shown).
  • Blending with lead-in portion 9, recess 8 presents a curved portion 12 narrowing as of lead-in portion 9 and with its convexity facing bottom 15 of gripper body 3.
  • Curved portion 12 terminates at seat 5 where it forms two opposite edges 17a and 17b which, as shown particularly in Figure 4, present a tangent substantially perpendicular to the longitudinal direction of gripper body 3 and hence to the direction of yarn 11 upstream from gripper 1.
  • tab 7 is so bent as to form a curved first portion 18 extending from bottom 15 of gripper 1 and oppositely curved in relation to hook portion 19 of drawing gripper 2 so as to correctly guide gripper 2 during exchange; and a top portion 21 bent upwards in relation to curved portion 18.
  • curved portion 12 of recess 8 defines the bottom of a portion 22 of curved portion 18, so that portion 22 is substantially semicircular and extends from top portion 21 towards bottom 15 and outwards of carrying gripper 1 so as to appropriately orient its bottom edge 23 as explained in more detail later on.
  • Gripping element 6 of carrying gripper 1 is formed in known manner on the opposite longitudinal side of the gripper to that presenting tab 7, and more specifically on the underside with respect to bottom 15 of gripper body 3.
  • Gripping element 6 substantially comprises a locating wall 24, and an elastic element 25 fitted to gripper body 3 and pressing elastically against locating wall 24.
  • An appropriately shaped lead-in element 27 is provided in known manner for assisting insertion of the yarn between wall 24 and elastic element 25.
  • gripper 1 therefore picks up yarn 11 at one end of the loom by means of lead-in portion 9 of recess 8 and lead-in element 27; and, as gripper 1 moves forward, yarn 11 is guided inside recess 8 into the correct position inside seat 5.
  • edge 17a is bent crosswise through gripper body 3 ( Figure 4) up to gripping element 6; and even if the yarn continues moving forward by force of inertia when gripper 1 is decelerated sharply to a halt during exchange, the yarn portion between seat 5 and gripping element 6 remains correctly positioned.
  • edge 17b being substantially perpendicular to the portion of yarn 11 extending upstream from seat 5, so that, on edge 17b first being contacted, the extra length of yarn is absorbed predominantly upstream from seat 5 as shown in Figure 2, so that the yarn portion between seat 5 and gripping element 6 remains substantially unaffected, and yarn 11 is correctly positioned for pickup by hook portion 19 of drawing gripper 2.
  • the loom may be operated with a very low tension of yarn 11, thus reducing the probability of the yarn breaking, and also eliminating the need for painstaking, time-consuming adjustment of brake 29.
  • edge 17b is no longer capable of retaining it inside seat 5
  • shape and orientation of edge 23 are such as to guide the yarn into a position adjacent to the inlet of hook portion 19 of drawing gripper 2 and so still assist exchange by preventing an increase in the length of the yarn portion between recess 8 and gripping element 6 ( Figure 3).

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP94116850A 1993-10-27 1994-10-25 Griffe d'amenée pour métiers à tisser Withdrawn EP0657569A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO930236 IT231509Y1 (it) 1993-10-27 1993-10-27 Pinza portante per macchine per tessitura.
ITTO930236U 1993-10-27

Publications (1)

Publication Number Publication Date
EP0657569A1 true EP0657569A1 (fr) 1995-06-14

Family

ID=11411356

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94116850A Withdrawn EP0657569A1 (fr) 1993-10-27 1994-10-25 Griffe d'amenée pour métiers à tisser

Country Status (2)

Country Link
EP (1) EP0657569A1 (fr)
IT (1) IT231509Y1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3081796A (en) * 1961-04-20 1963-03-19 Draper Corp Filling carrier for shuttleless looms
CH370721A (fr) * 1960-03-28 1963-07-15 Draper Corp Support d'introduction de la trame dans un métier à tisser sans navettes
FR2222467A1 (fr) * 1973-03-22 1974-10-18 Rockwell International Corp
US3874420A (en) * 1973-10-23 1975-04-01 Rockwell International Corp Weft inserting carrier
FR2278815A1 (fr) * 1974-07-18 1976-02-13 Etcoma Sarl Passe-trame amenee a couvercle basculant
DE2827354A1 (de) * 1978-06-22 1980-01-03 Mertens & Frowein Gmbh & Co Kg Greiferkopf fuer webmaschine
EP0441099A1 (fr) * 1990-02-05 1991-08-14 Sulzer RàœTi Ag Griffe porteuse pour métiers à tisser à griffes

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH370721A (fr) * 1960-03-28 1963-07-15 Draper Corp Support d'introduction de la trame dans un métier à tisser sans navettes
US3081796A (en) * 1961-04-20 1963-03-19 Draper Corp Filling carrier for shuttleless looms
FR2222467A1 (fr) * 1973-03-22 1974-10-18 Rockwell International Corp
US3874420A (en) * 1973-10-23 1975-04-01 Rockwell International Corp Weft inserting carrier
FR2278815A1 (fr) * 1974-07-18 1976-02-13 Etcoma Sarl Passe-trame amenee a couvercle basculant
DE2827354A1 (de) * 1978-06-22 1980-01-03 Mertens & Frowein Gmbh & Co Kg Greiferkopf fuer webmaschine
EP0441099A1 (fr) * 1990-02-05 1991-08-14 Sulzer RàœTi Ag Griffe porteuse pour métiers à tisser à griffes

Also Published As

Publication number Publication date
IT231509Y1 (it) 1999-08-03
ITTO930236U1 (it) 1995-04-27
ITTO930236V0 (it) 1993-10-27

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