EP0882822B1 - Removable force-fitting joint for the components of a heald frame for weaving looms - Google Patents

Removable force-fitting joint for the components of a heald frame for weaving looms Download PDF

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Publication number
EP0882822B1
EP0882822B1 EP97122305A EP97122305A EP0882822B1 EP 0882822 B1 EP0882822 B1 EP 0882822B1 EP 97122305 A EP97122305 A EP 97122305A EP 97122305 A EP97122305 A EP 97122305A EP 0882822 B1 EP0882822 B1 EP 0882822B1
Authority
EP
European Patent Office
Prior art keywords
joint
cross
plate element
profile
locating surface
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
EP97122305A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0882822A1 (en
Inventor
Roberto Nani
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.)
Nuova Omv Officine Meccaniche Vilminore Srl
Original Assignee
Nuova Omv Officine Meccaniche Vilminore Srl
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 Nuova Omv Officine Meccaniche Vilminore Srl filed Critical Nuova Omv Officine Meccaniche Vilminore Srl
Publication of EP0882822A1 publication Critical patent/EP0882822A1/en
Application granted granted Critical
Publication of EP0882822B1 publication Critical patent/EP0882822B1/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
    • D03C9/00—Healds; Heald frames
    • D03C9/06—Heald frames
    • D03C9/0666—Connection of frame parts
    • D03C9/0675—Corner connections between horizontal rods and side stays

Definitions

  • the present invention relates to a removable force-fitting joint for fixing together in a fast, stable and precise manner the components of a heald frame.
  • the invention relates to a corner joint for fixing together the side-pieces and the cross-beams of a heald frame.
  • the heald frame is a device used in weaving looms for obtaining the movement of groups of warp yarns by means of its alternating movement in a vertical plane perpendicular to the weaving plane.
  • a certain number of heald frames are arranged in the loom, this number increasing with the greater complexity of the design to be formed in the fabric, and the individual frames are operated by a weave machine for obtaining a predetermined design in the fabric.
  • Each heald frame comprises a rectangular border formed by two lateral elements, called side-pieces, which form the guides for alternate sliding of the frame, and by two horizontal elements, called cross-beams, onto the inner sides of which, a plurality of thin steel rods are fastened, said rods being provided with an intermediate eyelet allowing a warp yarn to pass through.
  • These rods are in fact referred to as healds.
  • the two side-pieces and the two cross-beams must obviously be fixed together at right angles, in the corner positions of the frame, so as to provide a rigid and stable structure which is able to withstand the high stresses to which the frame is subjected during its fast - in some cases extremely fast - alternating movement within the loom.
  • the joints connecting the side-pieces and cross-beams must be able to be disassembled easily and rapidly, even by personnel without any particular knowledge of mechanics, since frequently the weaver must vary the number or the type of healds inside a frame, so as to adapt the frame itself for the processing of a different fabric.
  • the object of the present invention is therefore that of providing a corner joint for heald frames of the general type described above, which is nevertheless able to withstand excessive stressing forces of the flexural type, damping them internally by means of microscopic displacements of the joint connecting components, so as to prevent these excessive stresses from being transmitted instead onto the weaker elements of the frame, i.e. onto the side-pieces, with the consequences described above.
  • said curved profiles are the same.
  • said curved profiles are different and in particular the profile of the edge of the plate element has radii greater than the profile of the locating surface of the cross-beam co-operating therewith.
  • the joint according to the present invention comprises a side-piece 1, from the ends of which two plate elements 2 project laterally (only one is shown in the drawings), said plate elements being rigidly fixed to, or formed integrally, with the side-piece 1.
  • the side-piece 1 and the plate elements 2 are obtained by means of mechanical machining from an extruded metal part consisting of aluminium.
  • Each plate element 2 is housed in a corresponding cavity 3 formed in the end part of the cross-beams 4, which are for example formed by extruded aluminium parts provided with ample longitudinal cavities separated by external ribs 4e and internal ribs 4i.
  • joint structures which have the general configuration described above have been known for some time, closing of the joint being performed by causing an edge of the plate element 2 projecting from the side-piece 1 to co-operate with a locating surface of the cross-beam or an element rigid therewith, by means of a locking screw which is operated from outside the cross-beam and presses the plate element 2 of the side-piece against said locating surface.
  • This locating surface may be formed by the same ribs 4i of the metal structure of the cross-beam, as in the case of IT-u-93000502, and in this case it consists of a substantially horizontal surface; or else this locating surface may consist of a block rigidly fixed to said internal rib 4i and having a flat locating surface inclined towards the inside of the frame, as occurs instead in the patent IT-A-1173519, and in this case a force-fitting joint is formed. In both cases the joint has those rigidity characteristics and those consequent drawbacks which have been already mentioned in the discussion of the documents relating to the prior art.
  • the joint according to the present invention belongs to the second category of joints described above, namely force-fitting joints, whose high level of locking efficiency it aims to maintain, while avoiding at the same time the drawbacks, i.e. essentially the inability to dampen the excessive flexural stresses which are transmitted onto the joint.
  • the Applicants are proposing to construct the locating surfaces of the plate element 2 and of a block 5 co-operating therewith - the latter being rigidly fixed to the cross-beam by means of a rivet seated in the hole 6 - no longer with a straight profile as taught by the prior art, but with a curved variable-radius profile having its concavity directed towards the inside of the frame.
  • the curved profile of the block 5 is such that the height of the block itself increases towards the end of the cross-beam, such that the joint which is formed by the coupling arrangement between block 5 and plate element 2 is a force-fitting joint.
  • the curved profiles of the element 2 and the block 5 are formed by identical circle involutes characterized by radii which are variable within the range of between 40 mm and 80 mm.
  • the screw 7 for locking the joint acts with its end part against a plate 8 which covers the corresponding edge of the element 2 and is made of a metallic material which is sufficiently resilient to allow microscopic oscillations of the plate 8 and hence of the element 2 with respect to the tip of the screw 7.
  • a plate 8 which covers the corresponding edge of the element 2 and is made of a metallic material which is sufficiently resilient to allow microscopic oscillations of the plate 8 and hence of the element 2 with respect to the tip of the screw 7.
  • said tip is rounded and a similar rounded receiving area is formed in the corresponding point of engagement of the screw 7 on the plate 8.
  • the plate 8 also extends at 90°, such that it can be stably fixed to the element 2 by means of screw means 9 which engage on the front edge of the element 2.
  • a joint for heald frames with very special characteristics is obtained.
  • the particular configuration of the locating surfaces of its component parts enables the joint, in the event of excessive flexural stresses exerted on it, to perform mutual microscopic rotations of the surface of the element 2, which has a variable-radius profile, and the corresponding surface of the block 5, passing from the ordinary position P to the microscopically rotated position P', owing also to the resilience of engagement of the screw 7 on the plate 8.
  • These microscopic rotations are so small that they do not create any macroscopically significant misalignment of the frame, but are sufficient to dampen significantly said excessive stresses, thus preventing them from being fully transmitted so as to cause deformation of the side-piece.
  • This possibility of microscopic rotation may be further facilitated by reducing the friction between the co-operating locating surfaces.
  • This result in addition to the normal measures of the known type for reducing the friction between two co-operating surfaces, may be obtained by constructing the two profiles with different curvatures and in particular with the curved profile of the plate element 2 which has wider radii than the corresponding locating surface of the block 5. In this way, in fact, the area of contact between the co-operating surfaces of the element 2 and the block 5 is reduced to a segment with a length equal to the thickness of the element 2 or, in more realistic terms, to a small area in the region of this segment.
  • the curved profile of the locating surface of the block 5 should terminate abruptly, on the side directed towards the side-piece, in a wall 5a which breaks away cleanly from the edge of the plate element 2, substantially at the maximum point of the profile of said element - a maximum point which is determined by the presence of a gentle connection of the element 2 with the wall of the side-piece - and hence at a significant distance d from the end face of the cross-beam.
  • This particular configuration of the block 5 thus enables a first advantage to be obtained, owing to the fact that the free rotation of the two co-operating surfaces with a curved profile is significantly facilitated.
  • the joint according to the present invention also provides considerable advantages during the frequent operations involving opening and closing of the frame in order to replace the healds.
  • the particular configuration of the profiles of the locating surfaces of the plate element 2 and the block 5 in fact makes it possible to achieve self-centring of the side-piece in perfect abutment against the cross-beam by simply tightening the screw 7, since the force exchanged between the two locating surfaces always has a component in the horizontal direction which, on the plate element 2, is directed towards the inside of the frame.
  • the element 2 therefore slides on the block 5 with the gradual tightening of the screws 7, until the side-piece 1 comes into perfect abutment against the cross-beam 4, recovering at the same time all the play existing between the various parts of the joint.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Looms (AREA)
  • Connection Of Plates (AREA)
  • Supports For Pipes And Cables (AREA)
EP97122305A 1996-12-18 1997-12-17 Removable force-fitting joint for the components of a heald frame for weaving looms Expired - Lifetime EP0882822B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT96MI002646A IT1289352B1 (it) 1996-12-18 1996-12-18 Giunto amovibile con incastro per gli elementi di un quadro porta-licci per telai di tessitura
ITMI962646 1996-12-18

Publications (2)

Publication Number Publication Date
EP0882822A1 EP0882822A1 (en) 1998-12-09
EP0882822B1 true EP0882822B1 (en) 2000-07-19

Family

ID=11375414

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97122305A Expired - Lifetime EP0882822B1 (en) 1996-12-18 1997-12-17 Removable force-fitting joint for the components of a heald frame for weaving looms

Country Status (7)

Country Link
EP (1) EP0882822B1 (it)
JP (1) JP3553780B2 (it)
KR (1) KR19980064260A (it)
DE (1) DE69702595T2 (it)
ES (1) ES2150184T3 (it)
IT (1) IT1289352B1 (it)
TW (1) TW401472B (it)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3308371C1 (de) * 1983-03-09 1984-05-30 Grob & Co AG, 8810 Horgen, Zürich Webschaft mit loesbaren Eckverbindungen
JPH0623586Y2 (ja) * 1989-05-22 1994-06-22 ナンカイ工業株式会社 織機のヘルドフレーム
KR920703894A (ko) * 1990-05-10 1992-12-18 베아트 구츨러 · 에두아드 로이 블리 분리가능한 단 연결부를 구비한 헤들프레임
US5411061A (en) * 1993-12-16 1995-05-02 Steel Heddle Mfg. Co. Heddle frame assembly with releasable end braces

Also Published As

Publication number Publication date
JPH10244425A (ja) 1998-09-14
KR19980064260A (ko) 1998-10-07
JP3553780B2 (ja) 2004-08-11
EP0882822A1 (en) 1998-12-09
ITMI962646A1 (it) 1998-06-18
IT1289352B1 (it) 1998-10-02
ES2150184T3 (es) 2000-11-16
DE69702595D1 (de) 2000-08-24
ITMI962646A0 (it) 1996-12-18
DE69702595T2 (de) 2001-04-19
TW401472B (en) 2000-08-11

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