EP0882822B1 - Lösbare Kupplungsvorrichtung für die Teile eines Webschaftes - Google Patents
Lösbare Kupplungsvorrichtung für die Teile eines Webschaftes Download PDFInfo
- 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
Links
- 238000009941 weaving Methods 0.000 title description 3
- 239000007769 metal material Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 102100039398 C-X-C motif chemokine 2 Human genes 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 101100061856 Homo sapiens CXCL2 gene Proteins 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910001234 light alloy Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
Images
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)
- Supports For Pipes And Cables (AREA)
- Connection Of Plates (AREA)
- Looms (AREA)
- Treatment Of Fiber Materials (AREA)
Claims (13)
- Lösbare kraftschlüssige Kupplung zum Befestigen der Seitenstücke (1) und der Querstreben (4) eines Webrahmens miteinander, von der Art, bei der jedes Ende des Seitenstückes (1) ein Plattenelement (2) aufweist, das in Richtung auf die Querstrebe (4) weist und von einer Ausnehmung (3) in der Querstrebe (4) aufgenommen wird, wobei ein erster Rand des Plattenelements (2) des Seitenstücks (1) mit einer Lokalisierungsfläche zusammenwirkt, die in der Querstrebe ausgebildet ist, und ein Schraubenmittel (7) zwischen der Querstrebe (4) und einem gegenüberliegenden Rand des Elements angeordnet ist, um so ein Verriegeln des Plattenelement (2) an der Querstrebe (4) gegen die Lokalisierungsfläche zu verursachen, dadurch gekennzeichnet, daß das Profil des ersten Randes des Plattenelements, das mit der Lokalisierungsfläche zusammenwirkt, und das Profil der Lokalisierungsfläche gekrümmte Profile mit einem unterschiedlichen Radius sind, deren Konkavität in Richtung auf das Zentrum des Webrahmens gerichtet ist.
- Kupplung nach Anspruch 1, wobei die Lokalisierungsfläche, die in der Querstrebe ausgebildet ist, auf einem Block (5) ausgebildet ist, der stabil an einem Längselement (4i) der Querstrebe (4) befestigt ist.
- Kupplung nach Anspruch 2, wobei die Höhe des Blocks (5) in Richtung auf das Ende der Querstreben (4) zunimmt.
- Kupplung nach Anspruch 3, wobei die Vorderflächen (5a) des Blocks (5), die zu dem Ende der Querstreben (4) gerichtet ist, bezüglich des Endes zurückgesetzt sind.
- Kupplung nach Anspruch 4, wobei die Vorderflächen (5a) des Blocks (5) an einem Maximalpunkt des Profils mit variablem Radius des Plattenelements (2) angeordnet ist.
- Kupplung nach einem der vorangehenden Ansprüche, wobei die Profile mit variablem Radius gleich sind.
- Kupplung nach einen der vorangehenden Ansprüche, wobei die Profile mit variablem Radius unterschiedlich sind und die Profile des Plattenelements (2) Radien haben, die größer sind als das Profil der Lokalisierungsfläche der Querstrebe.
- Kupplung nach Anspruch 7, wobei die Differenz zwischen den Radien des Profils des Plattenelements (2) und den entsprechenden Radien des Profils der Lokalisierungsfläche der Querstreben (4) geringer als oder gleich 10 mm sind.
- Kupplung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Profile mit variablem Radius in Form von Kreis-Evolventen sind.
- Kupplung nach einem der vorangehenden Ansprüche, wobei die Radien der Profile mit variablem Radius sich in dem Bereich zwischen 40 und 80 mm ändern.
- Kupplung nach einem der vorangehenden Ansprüche, wobei die Schrauben (7) zum Befestigen der Kupplung gegen eine Platte (8) aus einem hochwiderstandsfähigem Material kontaktieren, die an dem Rand des Plattenelements (2) befestigt ist, um mit der Schraube (7) zusammenzuwirken.
- Kupplung nach Anspruch 11, wobei die Schraube (7) einen runden Kopf hat und die Platte (8) eine entsprechend runde Ausnehmung zur Aufnahme des Schraubenkopf hat.
- Kupplung nach einem der vorangehenden Ansprüche, wobei das Plattenelement (8) mit dem Seitenstück (1) einstückig ausgebildet ist.
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 (de) | 1998-12-09 |
EP0882822B1 true EP0882822B1 (de) | 2000-07-19 |
Family
ID=11375414
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97122305A Expired - Lifetime EP0882822B1 (de) | 1996-12-18 | 1997-12-17 | Lösbare Kupplungsvorrichtung für die Teile eines Webschaftes |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0882822B1 (de) |
JP (1) | JP3553780B2 (de) |
KR (1) | KR19980064260A (de) |
DE (1) | DE69702595T2 (de) |
ES (1) | ES2150184T3 (de) |
IT (1) | IT1289352B1 (de) |
TW (1) | TW401472B (de) |
Family Cites Families (4)
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 |
WO1991017291A1 (de) * | 1990-05-10 | 1991-11-14 | Grob & Co. Aktiengesellschaft | Webschaft mit lösbaren eckverbindungen |
US5411061A (en) * | 1993-12-16 | 1995-05-02 | Steel Heddle Mfg. Co. | Heddle frame assembly with releasable end braces |
-
1996
- 1996-12-18 IT IT96MI002646A patent/IT1289352B1/it active IP Right Grant
-
1997
- 1997-12-17 DE DE69702595T patent/DE69702595T2/de not_active Expired - Fee Related
- 1997-12-17 KR KR1019970069940A patent/KR19980064260A/ko not_active Application Discontinuation
- 1997-12-17 EP EP97122305A patent/EP0882822B1/de not_active Expired - Lifetime
- 1997-12-17 ES ES97122305T patent/ES2150184T3/es not_active Expired - Lifetime
- 1997-12-18 TW TW086119194A patent/TW401472B/zh not_active IP Right Cessation
- 1997-12-18 JP JP34960397A patent/JP3553780B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
KR19980064260A (ko) | 1998-10-07 |
JP3553780B2 (ja) | 2004-08-11 |
IT1289352B1 (it) | 1998-10-02 |
TW401472B (en) | 2000-08-11 |
ITMI962646A1 (it) | 1998-06-18 |
DE69702595T2 (de) | 2001-04-19 |
ES2150184T3 (es) | 2000-11-16 |
JPH10244425A (ja) | 1998-09-14 |
ITMI962646A0 (it) | 1996-12-18 |
EP0882822A1 (de) | 1998-12-09 |
DE69702595D1 (de) | 2000-08-24 |
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