EP1215152A2 - Verbesserter Bremskörper für selbstgesteuerte Fadenbremse in Schussfadenliefervorrichtungen und Verfahren zu seiner Herstellung - Google Patents

Verbesserter Bremskörper für selbstgesteuerte Fadenbremse in Schussfadenliefervorrichtungen und Verfahren zu seiner Herstellung Download PDF

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Publication number
EP1215152A2
EP1215152A2 EP01204339A EP01204339A EP1215152A2 EP 1215152 A2 EP1215152 A2 EP 1215152A2 EP 01204339 A EP01204339 A EP 01204339A EP 01204339 A EP01204339 A EP 01204339A EP 1215152 A2 EP1215152 A2 EP 1215152A2
Authority
EP
European Patent Office
Prior art keywords
foil
frusto
planar
conical ring
braking body
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
EP01204339A
Other languages
English (en)
French (fr)
Other versions
EP1215152A3 (de
EP1215152B1 (de
Inventor
Giovanni Pedrini
Rosario Castelli
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.)
LGL Electronics SpA
Original Assignee
LGL Electronics 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 LGL Electronics SpA filed Critical LGL Electronics SpA
Publication of EP1215152A2 publication Critical patent/EP1215152A2/de
Publication of EP1215152A3 publication Critical patent/EP1215152A3/de
Application granted granted Critical
Publication of EP1215152B1 publication Critical patent/EP1215152B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H57/00—Guides for filamentary materials; Supports therefor
    • B65H57/24—Guides for filamentary materials; Supports therefor with wear-resistant surfaces
    • 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
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • 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
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/364—Yarn braking means acting on the drum
    • D03D47/366—Conical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • This invention is concerned with a braking body for self-governing thread-braking devices in weft feeder apparatus for weaving machines and more particularly for gripper-type or projectile-type looms, and with a process for the manufacture of said braking body.
  • the invention is concerned with self-governing thread-braking devices of the kind disclosed in prior IT-A-1 251 209 and IT-A-1 259 567, and referred to below as known devices.
  • Weft feeders are apparatuses typically comprising a cylindrical stationary drum, around which a swivelling arm winds a plurality of loops of thread constituting a weft stock, means for causing the loops that are being wound to shift forward from the base to the end of the drum, and a braking device for braking the thread unwinding from the drum on request of the loom and for imparting it the appropriate mechanical tension, as necessary for proper unwinding of the thread.
  • the braking member typically comprises a frusto-conical braking body which is elastically and frontally suspended with respect to the stationary drum of the feeder, and which is pushed against the drum by its elastic suspension, or by equivalent elastic means, and is tangent to the drum at an output circle slightly smaller than the maximum circumference of the drum.
  • the thread runs between the drum and the braking body and transfers the axial component of its own tension on the latter. Whenever the tension is increased -- due to an increase of the the running speed of the weft -- said axial component of the tension tends to shift the braking body against the elastic action of the elastic means and causes it, or tends to cause it, to move away from the drum, with an attendant decrease of the braking action.
  • Braking is therefore self-governed according to the running speed, and therefore to the mechanical tension, of the thread.
  • the braking body has appropriate mechanical characteristics, among which a high radial elasticity and a substantial axial rigidity are particularly important, as well as a low inertia and a high resistance to wear, at least in the area of the braking body which is tangent to the feeder drum.
  • the braking body from a tissue that is impregnated with a synthetic, preferably two-component resin, or, alternatively, from a rolled or calendered sheet of a typically thermosetting polymeric material.
  • the braking body is then provided with a wear-resistant metal coating on its inner side and substantially in a limited area straddling the drum contact circle, the coating being intended for directly contacting the thread that is to be braked by the body.
  • the above metal coating typically comprises a flat foil of stainless steel, preferably AISI 301 or 11R51, the former having a 400 HV hardness and the latter 600 HV.
  • Said foil which is advantageously cut by photoetching from a flat plate, is applied on the frusto-conical body, possibly cement, and possibly after shaping a shallow housing recess, so that the active surface of the foil is level with the inner surface of the braking body.
  • the known metal coating is effective and substantially adequate as far as its wear-resistance is concerned, it does have the drawback that the joint area at the opposite ends of the foil shows a notable discontinuity.
  • the discontinuous area is typically a line lying parallel to a generatrix of the frusto-conical braking body, and it causes considerable irregularities in the braking action imparted by said body. In fact, such discontinuity, as it becomes more pronounced due to wear, may in time give rise to peaks of mechanical tension in the thread, of sufficient intensity to cause its rupture.
  • the metal coating of the braking body from a continuous foil of malleable material which is shaped by drawing.
  • the drawable material for a coating of this known type is a copper-beryllium alloy, and the foil, after being drawn, is subjected to treatments of annealing and hardening under vacuum.
  • stainless steel AISI 304 as a drawable material and to subject the drawn foil to chrome-plating in order to increase its resistance to wear.
  • Both of the above described coatings made from continuous drawn foils have some disadvantages, mainly a high manufacturing cost and also an excessive liability to warping, which is inherent to the malleability of the metal support -- whether it is copper-beryllium or stainless steel AISI 304 -- and which makes the braking body liable to damage in case of bumps or other accidental causes. Furthermore, the surface hardness achieved by such foils after the above mentioned expensive treatments is still poor, being in the range 370 to 380 HV in the case of copper-beryllium and 240 to 250 HV in the case of stainless steel.
  • the present invention aims at eliminating the drawbacks mentioned above, and, more particularly, to provide an improved braking body exhibiting a high mechanical resistance and a high surface hardness with attendant high resistance to wear, while having, at the same time, a thread running surface which is substantially free from any discontinuities which might alter the proper operation of the braking body.
  • the invention provides a braking body wherein the wear-resistant metal coating comprises a planar foil, cut by photoetching from a planar stainless steel sheet exhibiting a high surface hardness, and having its ends joined to each other along a welding strip produced by a laser beam, so that a continuous frusto-conical ring is formed.
  • the stainless steel of said foil is chosen fron the group comprising the following steels: 11R51 - AISI 301 and highly tempered steels having a surface hardness higher than or equal to 600 HV.
  • a weft feeder 10 of a known type comprises a stationary drum 11 and a hollow swiveling arm, integral with a turning disc 12 located at the base of the drum, for winding a plurality of loops of thread SF around the drum to form a weft stock.
  • thread F unwinds from the drum, as called for by the loom or other weaving machine (not shown), by passing through a thread guide coaxial to the drum, and while unwinding it is subjected to a self-governing braking device, generally referenced with 14, and having the task of maintaining the tension of the thread by automatically adjusting the braking action as the running speed of the thread varies.
  • device 14 placed between thread guide 13 and drum 11, includes a braking member comprising a frusto-conical braking body 15, made of a synthetic tissue or foil impregnated with typically two-component polymeric resins and arranged facing drum 11, being tangent to it along an output circle slightly smaller than the maximum circumference.
  • Body 15 is pressed against drum 11 by am annular holder 16 and an elastic suspension 17, so that it brakes the thread unwinding from the drum with a predetermined elastic force, so-called static tension.
  • Holder 16 is supported on a carriage 18 which can be displaced axially with respect to drum 11 by a screw mechanism 19, in order to adjust said static tension.
  • the inner surface of braking body 15 is provided with a wear-resistant metal coating 20, for direct contact with the thread upon which said body applies its braking action.
  • coating 20 consists in a planar foil 20' (Fig. 3) cut by photoetching from a planar sheet of a stainless steeel having a high surface hardness.
  • the etched planar foil 20' has a substantially annulus-shaped profile interrupted by a segment T of a length depending on the taper i of frusto-conical ring 20" obtained from said foil when its ends 20a-20b are connected together.
  • the stainless steel constituting said foil is chosen from the group comprising the following steels: 11R51 - AISI301 and highly tempered steels having a surface hardness higher than or equal to 600 HV.
  • ring 20" is obtained by abutting the ends 20a-20b of the photoetched planar foil 20' to each other and by welding such ends to each other by laser-beam welding.
  • the strip ZS (Fig. 2) defining the joining weld of said ends is substantially rectilinear and has a width of 2 to 3 tenths of one millimeter, so that it is substantially imperceptible to the touch.
  • the strip may lie parallel to the generatrices of ring 20" or it may be oblique to said generatrices in the direction of unwinding of thread F from drum 11 of weft feeder 10.
  • Ring 20 obtained as specified above, or at least its inner frusto-conical surface which will contact thread F, may then be chrome-plated in order to further increase its surface hardness.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Braking Arrangements (AREA)
  • Storage Of Web-Like Or Filamentary Materials (AREA)
  • Unwinding Of Filamentary Materials (AREA)
EP01204339A 2000-12-01 2001-11-13 Verbesserter Bremskörper für selbstgesteuerte Fadenbremse in Schussfadenliefervorrichtungen und Verfahren zu seiner Herstellung Expired - Lifetime EP1215152B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2000TO001119A ITTO20001119A1 (it) 2000-12-01 2000-12-01 Corpo frenante perfezionato per dispositivi di frenatura autoregolante del filato di apparecchi alimentatori di trama e suo procedimento di
ITTO001119 2000-12-01

Publications (3)

Publication Number Publication Date
EP1215152A2 true EP1215152A2 (de) 2002-06-19
EP1215152A3 EP1215152A3 (de) 2003-10-22
EP1215152B1 EP1215152B1 (de) 2006-08-16

Family

ID=11458252

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01204339A Expired - Lifetime EP1215152B1 (de) 2000-12-01 2001-11-13 Verbesserter Bremskörper für selbstgesteuerte Fadenbremse in Schussfadenliefervorrichtungen und Verfahren zu seiner Herstellung

Country Status (4)

Country Link
EP (1) EP1215152B1 (de)
CN (1) CN1358891A (de)
DE (1) DE60122271T2 (de)
IT (1) ITTO20001119A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1512781A2 (de) * 2003-09-04 2005-03-09 L.G.L. Electronics S.p.A. Selbsteinstellende Fadenbremsvorrichtung für Fadenliefervorrichtungen für Webmaschinen

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20030833A1 (it) * 2003-10-23 2005-04-24 Lgl Electronics Spa Perfezionamento ai dispositivi di frenatura modulata degli apparecchi alimentatori di trama a macchine tessili.
ITTO20040105U1 (it) * 2004-08-05 2004-11-05 Lgl Electronics Spa Alimentatore di trama per telai di tessitura provvisto di dispositivo di frenatura auto-regolante
DE102016117616A1 (de) * 2016-09-19 2018-03-22 Saurer Germany Gmbh & Co. Kg Bremsring und Bremsanordnung für eine Spulenbremse, Spulenbremse und Verfahren zum Herstellen eines Bremsringes

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0957058A2 (de) * 1998-05-13 1999-11-17 L.G.L. Electronics S.p.A. Selbsteinstellende Fadenbremsvorrichtung für Fadenliefervorrichtungen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0957058A2 (de) * 1998-05-13 1999-11-17 L.G.L. Electronics S.p.A. Selbsteinstellende Fadenbremsvorrichtung für Fadenliefervorrichtungen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1512781A2 (de) * 2003-09-04 2005-03-09 L.G.L. Electronics S.p.A. Selbsteinstellende Fadenbremsvorrichtung für Fadenliefervorrichtungen für Webmaschinen
EP1512781A3 (de) * 2003-09-04 2006-05-17 L.G.L. Electronics S.p.A. Selbsteinstellende Fadenbremsvorrichtung für Fadenliefervorrichtungen für Webmaschinen

Also Published As

Publication number Publication date
DE60122271D1 (de) 2006-09-28
ITTO20001119A0 (it) 2000-12-01
EP1215152A3 (de) 2003-10-22
CN1358891A (zh) 2002-07-17
ITTO20001119A1 (it) 2002-06-01
DE60122271T2 (de) 2007-08-23
EP1215152B1 (de) 2006-08-16

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