EP0534233A1 - Bringergreifer und Nehmergreifer für schützenlose Webmaschinen, mit Fadentransport in schräger beziehungsweise vertikaler Ebene - Google Patents

Bringergreifer und Nehmergreifer für schützenlose Webmaschinen, mit Fadentransport in schräger beziehungsweise vertikaler Ebene Download PDF

Info

Publication number
EP0534233A1
EP0534233A1 EP92115444A EP92115444A EP0534233A1 EP 0534233 A1 EP0534233 A1 EP 0534233A1 EP 92115444 A EP92115444 A EP 92115444A EP 92115444 A EP92115444 A EP 92115444A EP 0534233 A1 EP0534233 A1 EP 0534233A1
Authority
EP
European Patent Office
Prior art keywords
gripper
weft
pair
grippers
weft yarn
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.)
Granted
Application number
EP92115444A
Other languages
English (en)
French (fr)
Other versions
EP0534233B1 (de
Inventor
Ettore Viscardi
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
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 SOMET Societa Meccanica Tessile SpA filed Critical SOMET Societa Meccanica Tessile SpA
Publication of EP0534233A1 publication Critical patent/EP0534233A1/de
Application granted granted Critical
Publication of EP0534233B1 publication Critical patent/EP0534233B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • D03D47/27—Drive or guide mechanisms for weft inserting
    • D03D47/277—Guide mechanisms
    • 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

Definitions

  • the object of the present invention is a pair of weft carrying and drawing grippers for shuttleless looms.
  • grippers are those members in shuttleless looms, by means of which the single weft yarns are gripped at one end of the loom and conveyed to the opposite end thereof through the warp shed.
  • the carrying gripper grips the weft yarn from a weft feeding device and conveys it to the centre of the shed.
  • the drawing gripper receives the weft yarn from the carrying gripper, at the centre of the shed, and conveys it to the opposite end of the loom.
  • the present invention concerns, in particular, a loom of the type in which weft yarn transport and exchange take place on a vertical plane.
  • the yarn clamping surfaces of the grippers are positioned according to a vertical plane, whereby the hook of the drawing gripper is positioned horizontally, instead of vertically as in more conventional technology.
  • This arrangement is more frequently adopted in high-speed looms and provides - compared to previous technique - some advantages which include, in particular, a reduced height (dimens.ion in a vertical direction) of the grippers and, consequently, a reduced friction due to rubbing between said grippers and the warp yarns, when the shed - in order to reduce the length of the cycle - is closed in advance in respect of the outlet of the grippers from the shed, thereby actually causing the rubbing of the warp yarns against said grippers.
  • the structure of the drawing gripper is simplified, as it no longer requires the presence of the cover to protect the hook from the warp yarns, which often causes difficulties in transferring the weft yarn from the carrying gripper to the drawing gripper.
  • the object of the present invention is therefore to propose a pair of weft carrying and drawing grippers of the general type described heretofore, which however eliminate the above drawbacks, while always guaranteeing a perfect weft yarn exchange at the centre of the shed.
  • an object of the present invention is to supply a pair of weft carrying and drawing grippers of reduced height, so as to notably lessen the rubbing of the gripper onto the warp yarns during the anticipated closing of the shed.
  • a further object of the present invention is to supply a pair of weft carrying and drawing grippers, wherein weft exchange takes place in reliable conditions even if the weft yarn tail carried by the carrying gripper is not perfectly tense.
  • a pair of weft carrying and drawing grippers for shuttleless looms of the type in which the carrying gripper has a free space to house the head of the drawing gripper and weft yarn clamping means apt to hold the weft yarn tail through said space, and in which the drawing gripper has a horizontally positioned hook and a yarn clamping zone lying on a vertical plane - characterized in that the clamping means of the carrying gripper are apt to hold the weft yarn tail along a slanting plane, and in that the hook of the drawing gripper faces the carrying gripper, that is, the side opposite to the reed.
  • the carrying gripper 1 and the drawing gripper 2 move one towards the other along the path 3 formed next to the reed 4.
  • the carrying gripper 1 carries the weft yarn T, the tail T′ of which is held by suitable clamping means through a free space 1a (see fig. 4) of said gripper.
  • the drawing gripper 2 moves into said free space, with its hook 9 beyond the weft yarn tail T′ and, in its subsequent backward movement, it hooks said tail T′ and draws it along therewith.
  • a wide free space is formed inside the carrying gripper and the weft yarn tail T′ is tensioned along a vertical plane outwardly of said free space;
  • the drawing gripper which is meant to move into said free space, is provided with a horizontally positioned hook which faces the reed 4, namely the side opposite to the carrying gripper, so as to grip from the inside the tense weft yarn tail T′.
  • the drawing gripper hook 9 faces the inner part of the carrying gripper 1, and thus the side opposite to the reed 4.
  • Fig. 4 shows in fact the carrying gripper 1 with its free space 1a housing (as shown in dashed lines) the weft yarn tail T′.
  • the drawing gripper 2 first penetrates into said space 1a and then moves out therefrom, drawing along said tail T′ with the hooking end 9a (fig. 2) of its hook 9; the tail T′ then positions itself according to the broken line shown in full in fig. 4.
  • the tail T′ is positioned - while being conveyed by the carrying gripper 1 - on a slanting plane forming an angle of less than 45° in respect of the horizontal plane, whereas - while being conveyed by the drawing gripper - it takes up a substantially vertical position (or a position slightly inclined towards the above slanting plane) shown in full lines in the same fig. 4. It should of course be clear that, when referring - here and elsewhere in the present description - to horizontal and vertical planes, one means, more exactly, the plane coinciding with the sliding plane of the grippers, and the plane perpendicular thereto.
  • the above arrangement allows - according to an advantageous aspect of the present invention and as clearly shown on the drawings - to construct the carrying gripper of considerably reduced height, as compared to the grippers of known technique. Furthermore, the slanting arrangement of the weft tail T′ allows said weft tail - in spite of the modest height of the gripper - to be sufficiently long to have an elasticity such that it can be overtaken without damages by the drawing gripper, as this latter penetrates into the carrying gripper.
  • the gripper 2 also comprises, in correspondence of the hook 9, two bulging ribs 5 and 6 projecting upwards and respectively downwards.
  • the bulging rib 5 is positioned along the centre of the drawing gripper head and slightly backward in respect of its front end, while the bulging rib 6 is positioned along the side of the drawing gripper head closest to the loom reed, just below its front end.
  • Such ribs are actually meant to spread apart the warp yarns which bear onto the gripper body during closing of the shed - as clearly shown in fig. 3 - so as to keep them spaced from the cutting edges of the gripper and hook, and prevent them from possibly being cut off.
  • a further advantage of the slanting arrangement of the weft yarn tail T′, held in the carrying gripper according to the invention, lies in the fact that it allows to weave also with a slightly braked weft yarn, thereby reducing friction on the weft and the need for devices apt to control and keep a perfect tension thereof.
  • the height of the hooking end 9a of the hook 9 - which is at a high level in respect of the gripper sliding plane - and the particular shape of its profile 9b, forwardly inclined towards the gripper head, determine a reliable hooking action in any condition of weft yarn tension.
  • the grippers described and claimed herein are in fact of reduced height and therefore apt to strongly reduce rubbing against the warp yarns, and furthermore, the configuration of the drawing gripper is such as to prevent accidental cutting of the warp yarns during closing of the shed, or of the yarns which may have caught into the shed, and to reliably hook the weft yarn even when the same is not perfectly tense into the carrying gripper.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP92115444A 1991-09-11 1992-09-09 Bringergreifer und Nehmergreifer für schützenlose Webmaschinen, mit Fadentransport in schräger beziehungsweise vertikaler Ebene Expired - Lifetime EP0534233B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI912405A IT1251304B (it) 1991-09-11 1991-09-11 Coppia di pinze portante-traente per telai di tessitura senza navetta con trasporto della trama rispettivamente in un piano obliquo e verticale
ITMI912405 1991-09-11

Publications (2)

Publication Number Publication Date
EP0534233A1 true EP0534233A1 (de) 1993-03-31
EP0534233B1 EP0534233B1 (de) 1996-08-14

Family

ID=11360643

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92115444A Expired - Lifetime EP0534233B1 (de) 1991-09-11 1992-09-09 Bringergreifer und Nehmergreifer für schützenlose Webmaschinen, mit Fadentransport in schräger beziehungsweise vertikaler Ebene

Country Status (4)

Country Link
EP (1) EP0534233B1 (de)
DE (1) DE69212752T2 (de)
ES (1) ES2090437T3 (de)
IT (1) IT1251304B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998044180A1 (de) * 1997-04-02 1998-10-08 Picanol N.V. Greiferwebmaschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH502461A (de) * 1969-11-27 1971-01-31 Fischer Ag Brugg Georg Greiferpaar für den Schusseintrag in einer Webmaschine
DE2644505A1 (de) * 1975-10-03 1977-04-07 Nuovo Pignone Spa Nadelpaar fuer webstuehle mit stationaerem schussfadenvorrat
AT377540B (de) * 1982-11-05 1985-03-25 Saurer Ag Adolph Schussfadengreifer fuer eine webmaschine
EP0248486A1 (de) * 1986-06-03 1987-12-09 Picanol N.V. Bringergreifer für Greiferwebmaschinen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH502461A (de) * 1969-11-27 1971-01-31 Fischer Ag Brugg Georg Greiferpaar für den Schusseintrag in einer Webmaschine
DE2644505A1 (de) * 1975-10-03 1977-04-07 Nuovo Pignone Spa Nadelpaar fuer webstuehle mit stationaerem schussfadenvorrat
AT377540B (de) * 1982-11-05 1985-03-25 Saurer Ag Adolph Schussfadengreifer fuer eine webmaschine
EP0248486A1 (de) * 1986-06-03 1987-12-09 Picanol N.V. Bringergreifer für Greiferwebmaschinen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998044180A1 (de) * 1997-04-02 1998-10-08 Picanol N.V. Greiferwebmaschine

Also Published As

Publication number Publication date
ES2090437T3 (es) 1996-10-16
DE69212752D1 (de) 1996-09-19
EP0534233B1 (de) 1996-08-14
IT1251304B (it) 1995-05-08
ITMI912405A0 (it) 1991-09-11
ITMI912405A1 (it) 1993-03-12
DE69212752T2 (de) 1996-12-19

Similar Documents

Publication Publication Date Title
US4417606A (en) Weft propelling grippers for textile looms
US4957145A (en) Pneumatic weft thread holder for a selvage device
US7128098B2 (en) Transfer gripper for a rapier weaving loom
EP0576074B1 (de) Nehmergreifer für Webmaschinen
EP0534233B1 (de) Bringergreifer und Nehmergreifer für schützenlose Webmaschinen, mit Fadentransport in schräger beziehungsweise vertikaler Ebene
US3580291A (en) Filling carrier for use in shuttleless looms
US4913195A (en) Gripper loom
US4062382A (en) Extending carrier for looms with removal of the filling yarn from stationary bobbins
US3927699A (en) Weft carrier control apparatus
US3874420A (en) Weft inserting carrier
US3934621A (en) Carrier for shuttleless looms
EP0571025B1 (de) Nehmergreifer für Webmaschinen
US3978897A (en) Weft extending carrier
EP0161014A1 (de) Schussannullierungsvorrichtung für Greiferwebmaschinen
US4505305A (en) Carrying gripper for looms
US3779288A (en) Weft carrier guide
CA1135594A (en) Weft carrier
EP1052318B1 (de) Schussannulierungsvorrichtung für Webmaschinen
US4194539A (en) Loom shuttle
US4147187A (en) Shuttle
CS201008B2 (en) Weft inserting needle pair for shuttleless weaving loom
EP0822279B1 (de) Mitnehmergreifer für Webmaschinen
GB2058853A (en) Weft inserting device for shuttleless loom
US3119416A (en) Filling carriers for shuttleless looms
US3921678A (en) Device for selecting a weft thread in a shuttleless loom supplied by external spools

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE CH DE ES FR IT LI

17P Request for examination filed

Effective date: 19930824

17Q First examination report despatched

Effective date: 19950302

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE CH DE ES FR IT LI

REF Corresponds to:

Ref document number: 69212752

Country of ref document: DE

Date of ref document: 19960919

ITF It: translation for a ep patent filed

Owner name: FUMERO BREVETTI S.N.C.

ET Fr: translation filed
REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2090437

Country of ref document: ES

Kind code of ref document: T3

REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: PATENTANWAELTE SCHAAD, BALASS, MENZL & PARTNER AG

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2090437

Country of ref document: ES

Kind code of ref document: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20050912

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20060915

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20060920

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20060927

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20060930

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20061006

Year of fee payment: 15

BERE Be: lapsed

Owner name: SOCIETA' MECCANICA TESSILE S.P.A. *SOMET

Effective date: 20070930

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070930

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080401

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070930

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070930

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20080531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20071001

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20070910

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070910

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070909