EP0893522B1 - Device to control the slotted leno heald weave mechanism in looms - Google Patents

Device to control the slotted leno heald weave mechanism in looms Download PDF

Info

Publication number
EP0893522B1
EP0893522B1 EP19980112069 EP98112069A EP0893522B1 EP 0893522 B1 EP0893522 B1 EP 0893522B1 EP 19980112069 EP19980112069 EP 19980112069 EP 98112069 A EP98112069 A EP 98112069A EP 0893522 B1 EP0893522 B1 EP 0893522B1
Authority
EP
European Patent Office
Prior art keywords
sliders
control device
line guide
guide mechanism
leno heald
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
EP19980112069
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0893522A1 (en
Inventor
Giuseppe Casarotto
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
Promatech SpA
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Filing date
Publication date
Application filed by Promatech SpA filed Critical Promatech SpA
Publication of EP0893522A1 publication Critical patent/EP0893522A1/en
Application granted granted Critical
Publication of EP0893522B1 publication Critical patent/EP0893522B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C7/00—Leno or similar shedding mechanisms
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C11/00—Selvedge shedding mechanisms not forming part of main shedding mechanism

Definitions

  • the present invention concerns a control device for a slotted leno heald weave mechanism, to form selvedges and split selvedges of fabrics in looms.
  • the slotted leno heald weave is commonly carried out in correspondence of the selvedges and/or split selvedges, at the sides of the fabric being formed.
  • slotted leno heald weave mechanisms substantially consisting of three sliders - a fixed one and two movable ones - carrying as many slotted healds to let the warp yarns through.
  • the movable sliders have to perform a straightaway reciprocating motion, so as to draw along the respective healds with the warp yarns therein, and form, together with the weft yarn, the typical slotted leno heald weave.
  • slotted leno heald weave The actual operation of the slotted leno heald weave shall not be described herein, as it is well known in this technical field, but a study shall be made on the requirements which the slotted leno heald weave mechanism has to satisfy and, in particular, on the device to control said mechanism.
  • the two sliders to which the slotted healds are connected have to perform a straightaway motion, in opposite directions, along axes substantially orthogonal to the weaving plane.
  • slotted leno heald weave mechanism and thus various pairs of sliders, on the same loom.
  • slotted leno heald weave can be carried out either at the weft yarn outlet end, both for the selvedge and for the split selvedge, or at the weft yarn inlet end, or even half way along the shed if the fabric is subsequently split in two parts.
  • the opening and closing of the shed in correspondence of said mechanisms will have to be synchronized with the passage of the weft yarn, so that said yarn may be tied and locked as promptly as possible, and may thus be prevented from moving or accidentally sliding out.
  • the closing of the shed takes place close to the drawing gripper while this latter is still not fully out of the shed, so as to promptly block the weft yarn, while on the yarn inlet side, and eventually in the middle, the warp shed may be closed only after full insertion of the weft yarn. It can thus be understood why it is necessary to shift the working phases of the different leno heald weave mechanisms.
  • the Italian Patent No. 1.185.389 in the name of the Applicant, or the EP-B1-393.467, in the name of SOMET S.p.A., illustrate different solutions adopted on devices to control the leno heald weave mechanism.
  • a cam synchronized with the working motion of the loom controls the movement of a cord sliding horizontally above the loom and connected, by means of secondary cords, to pairs of sliders forming part of corresponding mechanisms distributed along the loom width.
  • the secondary cords cause the reciprocating motion of said pairs of sliders in opposition to return springs.
  • leno heald weave mechanisms have been proposed, which are individually controlled by electric motors.
  • the International Patent publication WO96/38608 in the name of PICANOL N.V., discloses a device to control a leno heald weave mechanism, wherein an electric motor operates a double link rod-crank system which allows to obtain the required reciprocating motion of the two sliders.
  • each device can be individually controlled by restoring, with an "electrical axis", the synchronism between the motion of the electric motors and the motion of the loom.
  • the link rod-crank mechanism is itself labile, as it must forcedly be guided in order to perform the required straightaway motion.
  • the sliders to which the ends of the cranks are connected are guided in their straightaway reciprocating motion by guide elements which make the mechanism more complex and produce undesired sliding frictions. Such frictions, besides causing more wear to the sliders, involve the requirement to use a more powerful motor.
  • the motor rotation can be continuous; it is however necessary to support, with suitable supports, the crankshaft which would otherwise be overhanging on the motor shaft.
  • BE 1007897A3 discloses a drive mechanism transferring the motion from a drive shaft continuously rotating in the same direction, to reciprocating weave healds.
  • the drive mechanism consist of a linkage including two turning pairs couplings and one sliding pair coupling.
  • the object of the present invention is to fully overcome the above drawbacks, by supplying a device to control the slotted leno heald weave mechanism - to form selvedges and split selvedges of fabrics in looms - which can be easily and indipendently adjusted and operated, which involves low working frictions, which covers a reduced space towards the loom depth, and which is of simple and reliable structure.
  • control device is clearly illustrated in figs. 2A and 2B, wherein it is shown combined with the respective slotted leno heald weave mechanism.
  • a support plate S carrying:
  • the motor M preferably consists of an electric step-by-step motor which controls the drive mechanism 1. Said mechanism reproduces an exact straight-line guide of the conventional type.
  • the mechanism 1 is preferably that shown in detail in figs. 3A and 3B.
  • a casing 11, on which the motor M is mounted, houses the elements forming the exact straight-line guide.
  • a rotor 12, mounted rotating on a bearing 13, is connected to the driving shaft 14 of the electric motor M.
  • a planetary gear 15 is mounted rotating on the rotor 12 by way of a supporting spindle 15a positioned parallel to, but eccentric in respect of the rotation axis of the shaft 14.
  • the gear 15 comprises an outer toothing 16 meshing with an internal gear 17, fixed to or formed in one piece with the casing 11.
  • Said drive mechanism 1 allows to change the rotary motion of the driving shaft 14 into a straightaway reciprocating motion of the pin 18a - as shown in figs. 4A and 4B - which follows a perfectly sinusoidal law in time, if the rotation of the electric motor M is continuous and constant, but which may follow different motion laws by suitably operating the electric motor M.
  • This mechanism 1 is to be able to obtain a straightaway reciprocating motion without the help of guide elements which inevitably produce sliding frictions, but simply making use of gearings which keep an overall high driving efficiency, thereby achieving a first object of the present invention.
  • the reciprocating motion system 2 is meant to transmit the reciprocating straightaway motion of the pin 18a onto two sliders C1 and C2.
  • the system 2 comprises a pair of idle pulleys P1 and P2 (with their axis fixed onto the casing 11), around which winds an endless belt 21.
  • the upper ends of the two sliders C1 and C2 are respectively blocked on the two opposite lengths of the belt 21.
  • the end of one of the two sliders - for instance, the end of the slider C1 - extends into a lateral projection, so as to form a seat 22 into which is inserted the head of the pin 18a.
  • the device of the present invention allows a coplanar arrangement of the two sliders C1 and C2, which leads to a drastic reduction in size towards the loom depth, thereby accomplishing another important object of the present invention.
  • control device is easy to assemble and disassemble, to the full advantage of its maintenance.
  • the drive mechanism 1, together with the reciprocating motion system 2 are mounted on the support plate S, which is in turn fixed onto the cross member T by means of dog spikes D.
  • Said dog spikes D are screwed onto the support plate S, so as to facilitate their removal and, thus, the disassembly of the whole device from the cross member T.
  • a position sensor (not shown) detects the angular position of the driving shaft 14, timing it with the working of the loom.
  • the operator may shift at will the working phase of the motor M, in respect of the motion of the loom, by manually acting onto a suitable control (for instance a manually controlled electronic encoder) positioned close to the loom; the operator thereby anticipates or delays the final step of the slotted leno heald weave, so as to visually and empirically preset the optimal working of the device.
  • a suitable control for instance a manually controlled electronic encoder
  • the electronic control of the electric step-by-step motor M also allows to obtain time motion laws for the sliders C1 and C2, which are not simply sinusoidal but are apt to advantageously provide alternate idle and active steps.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP19980112069 1997-07-17 1998-06-30 Device to control the slotted leno heald weave mechanism in looms Expired - Lifetime EP0893522B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI971691 1997-07-17
IT97MI001691 IT1293618B1 (it) 1997-07-17 1997-07-17 Dispositivo di comando per la legatura a giro inglese in telai di tessitura

Publications (2)

Publication Number Publication Date
EP0893522A1 EP0893522A1 (en) 1999-01-27
EP0893522B1 true EP0893522B1 (en) 2003-09-10

Family

ID=11377570

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980112069 Expired - Lifetime EP0893522B1 (en) 1997-07-17 1998-06-30 Device to control the slotted leno heald weave mechanism in looms

Country Status (4)

Country Link
EP (1) EP0893522B1 (it)
DE (1) DE69817940T2 (it)
ES (1) ES2206796T3 (it)
IT (1) IT1293618B1 (it)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2794141B1 (fr) * 1999-05-27 2001-07-13 Staubli Gmbh Dispositif de formation de la foule pour la realisation d'une lisiere et metier a tisser equipe d'un tel dispositif
ITMI991221A1 (it) * 1999-05-31 1999-08-31 Somet Soc Mec Tessile Dispositivo e metodo per la formazione della cimosa in un telaio di te ssitura
ITMI20022044A1 (it) * 2002-09-26 2004-03-27 Promatech Spa Dispositivo di legatura della falsa cimosa in telai tessili
ITMI20030293U1 (it) * 2003-06-26 2004-12-27 Promatech Spa Apripinza motorizzato perfezionato
JP4718248B2 (ja) * 2005-06-06 2011-07-06 津田駒工業株式会社 耳織成装置
DE602005020150D1 (de) 2005-11-04 2010-05-06 Promatech Spa Kettfädenwebvorrichtung zur Webkantenbildung in Webmaschinen
CN109252267B (zh) * 2018-11-26 2023-06-27 山东日发纺织机械有限公司 一种纱罗组织的开口机构

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1230002B (it) * 1989-04-21 1991-09-20 Somet Soc Mec Tessile Dispositivo mobile per eseguire la legatura a giro inglese dei bordi di tessuti in formazione su telai di tessitura senza navette.
BE1007897A3 (nl) * 1993-12-22 1995-11-14 Picanol Nv Zelfkantinrichting voor weefmachines.
BE1009375A6 (nl) * 1995-05-29 1997-02-04 Picanol Nv Kanteninrichting voor weefmachines.
FR2735795B1 (fr) * 1995-06-20 1997-07-18 Icbt Diederichs Sa Dispositif pour la realisation d'une fausse lisiere a pas de gaze sur une machine a tisser

Also Published As

Publication number Publication date
EP0893522A1 (en) 1999-01-27
ES2206796T3 (es) 2004-05-16
ITMI971691A1 (it) 1999-01-17
DE69817940D1 (de) 2003-10-16
DE69817940T2 (de) 2004-07-15
IT1293618B1 (it) 1999-03-08

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