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
  • D03C7/02—Gauze healds

Definitions

• This invention relates to a leno heddle in accordance of the identical preamble of indeperdent patent claims 1 and 15 of this invention.
• leno fabric weaving is realized by a pair of opposite mounted leno heddles, wherein each leno heddle is composed of a plastic lifting heddle, with a pair of lifting shanks and of a metallic doup heddle.
• the leno heddle is described e.g. in the Swiss Patent No.579 161 and in the US Patent No. 3,990,481.
• Its metallic doup heddle features the same thickness along the entire length of lifting shanks, bridge and hanging guide.
• the hanging guide is shaped in the form of longitudinal closed eyes on the outer side of each shank.
• the metallic material of the doup heddle ensures its good function and lifetime.
• the eye of the doup heddle has an optimum shape for guiding of one of warp threads. In case of closed hanging guide of the doup shank the perfect hanging of the metallic doup in the carrying element of the leno frame is assured.
• each of both lifting shanks of the plastic lifting heddle consists of an open upper loop and a lower loop, upper and lower shank and a widened taper.
• the taper is equipped with the guiding orifice, whose lower end adjacent to the lower shank forms a stop.
• each lifting shank is in the widened taper, upper shank and upper loop equipped with several reinforcing metallic elements , which increase the lifetime of lifting shanks, but their manufacture is more expensive.
• each lifting shank of the lifting heddle has a guiding slot formed in the taper contact part, the lower part adjacent to the lower arm of said guiding slot forms a stop, while the through opening is leaded into the guiding orifice.
• the guiding slot of the right shank copies the opposite guiding slot of the left shank of the lifting heddle.
• the advantage resides in the prolonged lifetime of the leno heddle along with the improved resistance against mechanical stress of the plastic shanks of the lifting heddle, reduced wearing of both warp threads and better access by leading the warp thread in the eye of metallic doup heddle, including the less difficult service.
• the guiding slot contributes to more ease leading in of one of warp threads, where below the taper contact part the impair of the plastic material does not occur and the risk of damage of warp threads themselves will be eliminated.
• the combination of both half-circle slots of the right and left lifting shank set gives the optimum circular orifice, which copies the eye of the doup heddle, so that the grip of the two warp threads during the doup heddle striking does not occur.
• the manufacture of these slots composing the orifice is easier.
• Each lifting shank of the lifting heddle can have its own end loop formed in the C-shape hang, with the rounded enlarged termination. The hang increases the mechanical strength of the end loop, and its rounding reduces the specific pressure load of the end loop. If a guiding slot will be formed in the droplet shape, considering an ease manufacture, e.g.
• the set of both half-circle slots of the right and left lifting shank will form together the preponderant circle-shaped orifice, which copies the eye of doup heddle, so that the grip of the two warp threads during the doup heddle striking will not occur.
• the smooth transition part is adapted by its form to the movement of warp threads during the striking, and increases the mechanical resistance of the stop edges against excessivee wearing at the long run.
• the use of the droplet-shaped guiding slot is designed essentially for processing of fine threads, e.g. threads of lower tex numbers.
• the guiding slot of both shanks of the lifting heddle can be triangular-shaped, with identical or different lengths of both guiding edges.
• the triangular-shaped guiding slot of both shanks of the lifting heddle enables the extension of use range for further qualities of input materials with medium or higher tex numbers.
• the triangular- shaped guiding slot between upper guiding edge, adjacent to tapered edge, and lower guiding edge, adjacent to the lower arm, can feature right or acute angle.
• the right angle between both leading edges eliminates the influence of an uneven stress of warp threads.
• the acute angle betweeen both leading edges is suitable for threads with different tex numbers in the same warp.
• the triangular-shaped can have the upper guiding edge shorter than the lower guiding edge, alternatively both these guiding edges can have the same length. If both guiding edges have the identical length, the shanks are suitable for textured yarn. In case the upper guiding edge of the guiding orifice is shorter, than the lower edge, the guiding slot simulates the droplet shape.
• the thickness range of the upper and/or lower end loop is from one to three times compared with upper or lower arm it is useful or sometimes necessary in case the warp threads are extremely loaded.
• both lifting shanks of the lifting heddle made of polyoxymethylene - POM, which is self-lubricating, and features the necessary mechanical and physical properties for given technology of leno weaving.
• the disadvantages of a metallic doup heddle mentioned will be removed of substantially supressed by using the leno heddle, with properties according to the preamble of independent claim 14 (identical with the preamble of independent claim 1) of this invention.
• the object of the invention is to provide a hanging guides of metallic doup heddle, having each an interruption in the lower outer part.
• This innovative embodiment of the metallic doup heddle can be utilized also for the new above mentioned plastic lifting heddle according this invention.
• the main advantage of the interruption of hanging guide of metallic doup heddle consist in the possibility of damaged part of plastic lifting heddle to be more easily changed, while after the change of new undamaged plastic lifting heddle, the removed original metallic doup heddle with the interruption can be mounted again in the leno frame.
• Fig. 1 shows a front view of the metallic doup heddle
• Fig. 2 shows a side view of the metallic doup heddle from Fig. 1
• Fig. 3 shows a front view of a lifting heddle, composed of a pair of lifting shanks, each having the half-circle formed guiding slot
• Fig. 4 shows a front view of the right lifting shank from Fig. 3
• Fig. 5 shows a side view from Fig. 4 from the side of guiding edge of the shank
• Fig. 6 shows a side view from Fig. 4 from the outer side of the shank
• Fig. 7 shows a front view of the leno heddle, with the half-circular guiding slot of shanks of the lifting heddle, and the doup heddle indicated by dash lines,
• Fig. 8 shows a detail of the upper end loop of the left shank from Fig. 3,
• Fig. 9 shows a detail of the upper end hang loop of the right shank from Fig. 3
• Fig.10 shows a detail of the lower end hang loop of the left shank from Fig. 3
• Fig.11 shows a detail of the lower end hang loop of the right shank from Fig. 3
• Fig.12 shows a detail of the taper of the right lifting shank from Fig. 3
• Fig. 13 shows a detail of the tapered portion of the leno heddle from Fig. 7
• Fig. 14 shows a front view of leno heddle, ith the droplet- shaped guiding slot of shanks of the lifting heddle, and with the doup heddle indicated by dash lines
• Fig. 15 shows a side view of the lifting shank from Fig. 14 from the side of the taper guiding edge
• Fig. 16 shows a side view of the lifting shank from Fig. 14 from the outer side
• Fig. 17 shows a detail of the taper of the right lifting shank from Fig. 14
• Fig. 18 shows a detail of the taper from Fig. 14;
• Fig. 19 shows a front view of leno heddle with the lifting heddle, having each shank equipped with the triangular guiding slot, with the identical lengths of guiding edges, where the metallic doup heddle is indicated by dash lines
• Fig. 20 shows a detail of the taper of the right lifting shank from Fig. 19
• Fig. 21 shows a detail of the taper of leno heddle from Fig. 19;
• Fig. 22 shows a front view od leno heddle, with the lifting heddle having each shank equiped with the triangular guiding slot, with the guiding edges of different lengths, where the metallic doup heddle is indicated by dash lines
• Fig. 23 shows a detail of the taper of the right lifting shank from Fig. 22
• Fig. 24 shows a detail of the taper of leno heddle from Fig. 22.
• the metallic doup heddle 1 (Fig. 1) is formed in the shape of forceps, consisting of two parallel doup arms 1, 2 , while each of which is on the one end connected by a bridge 4. in the perpendicular arrangement to both arms, and is equipped with the outer arranged eye 5.
• Each of both doup arms 2 , 3 has on the free end from its outer side arranged the hanging guide 6, which is formed in the shape of longitudinal eye.
• Each hanging guide 6 is on its outer lower ends equipped with the interruption 7, 8, formed in a narrow interstice or gap. In case the hanging guide 6 of the arms 2 , 3.
• the metallic doup heddle 1 is massive enough, so that the interstice or gap 1_, 8 can be substituted by a slot.
• the metallic doup heddle 1 is fabricated as a whole, and features the same thickness along the entire length (Fig. 2).
• the lifting heddle 9 (Fig. 3) consists of two lifting shanks 1O, 11, of the right shank 10 and the left shank 11.
• Each of lifting shanks 10, 11 (Fig. 3, 4, 5, 6) consists on the ends of an upper end hang loop 12, and of an opposite placed lower end hang loop 13..
• the upper end hang loop 12 is linked to the upper arm 14., the lower end hang loop 13 to the lower arm 15. Both, right lifting shank 10. and left lifting shank 11, having their upper arms 14.
• both lower arms 15 are serving as the guiding elements for the lifting shanks 10, 11, and therefore they can be relative thin.
• the enlarged portion of the taper 16 is situated, with the guiding orifice 17.. From the side views of the lifting shank 10 . (Fig. 5, 6) can be seen, that the lifting right shank 10 has the same thickness along its whole length, excepting the medium portion of taper 16., which has the biggest thickness, being exposed to maximum load during operation, or in the moment of impact at the resting point of the metallic doup heddle 1 of the leno heddle 18.
• Each of lifting shanks 10 11 of lifting heddle 9 is formed as one plastic part, made of polyoxymethylene , using e.g. the injection moulding technology.
• the basic functional parts namely the metallic doup heddle 1 and lifting shanks 10., 11 of the lifting heddle 9 (Fig. 7), form the complete arrangement of leno heddle 18.
• the upper and lower end hang loops 12., 13 are on their ends equipped by a hang 19, formed into a rounded enlarged C-shaped termination (Fig. 8, 9, 10, 11).
• Each taper 16 (Fig. 12, 13) of shanks 10., 11 is equipped with the tapered edge 20 for guiding of one of warp threads in the correct direction, and with a half-cirular guiding slot 21 for guiding in the second warp thread.
• the lower portion of guiding slot 21 forms the stop 22, representing the bearing surface for the eye 5, with the bridge 4 of metallic doup heddle 1.
• the half-circle guiding slot 21 is placed approximately in the centre of the contact portion 23 of the taper 16, and has half-circle shape, so that the guiding slots 21 form a circular orifice, when both contact portions 23 . of lifting shanks 10., 11 enter into mutual contact.
• the guiding orifice 17 (Fig.
• a deep long groove (Fig. 5) along the entire length of the inner portion of the taper 16 , adjacent tapered edge 20 . , and its contact portion 23 . including the half-circular guiding slot 21 and the stop 22.
• the guiding orifice 17, from this deep long groove is leaded from the outer side portion of the right lifting shank 10 (Fig. 6 ) in a form of linking groove only to the area of the lower portion of the taper 16, corresponding approximately to the portion, linked to stressed half-circular guiding slot 21 with the stop 22.
• both narrow lower shanks 15 o lifting shanks 10, 11 of the lifting heddle 9, are placed in a parallel position so, that sliding of their adjacent side edges takes place during the lifting phase.
• the metallic doup heddle 1 is inserted into the guiding orifice 17 of the half-circular guiding slot 21 of tapers 16 of both lifting shanks 10., 11, and above their contact portion so, that one of its eyes will enter each lifting heddle 9..
• the doup heddle l is inserted in the guiding orifice 17 of the taper 16 of the lifting heddle 9 so, that in the gap between upper lifting arms 14 of lifting shanks 10, 11 the doup heddle can move freely up and down. If one of both lifting heddles 9 is being lifted, the doup heddle 1 does so in the same moment.
• the standard principle of weaving leno fabrics is based on a system of warp and weft threads sets.
• the pass of warp threads is arranged so, that one of two warp threads is guided into the eye 5 of the metallic doup heddle 1, and subsequently the second warp thread will pass freely between relevant pairs of lifting shanks 10, 11 of the lifting heddle 9.
• the friction occures, which will be transited onto the contact places of the leno heddle 18.
• the leno heddles 18 are hanged in the leno frame of weaving machine by means of end hang loops 12., 13..
• end hang loops 12., 13. During the weaving itself the change of harness blades takes place, which is accompanied with considerable stresses of both end hang loops 12 . , 13..
• the specific pressure load, during the striking movement of the metallic doup heddle 1 up and down, will be reduced thanks the broaded hanger 19 of end hang loops 12, 13., and rounding of hanger 19.
• the breaking away of end hang loops often occured.
• the leno heddle 18 . which illustrates Fig.14, corresponds to above described leno heddle embodiment, including its function, with the difference, that the lifting heddle 9 is on both lifting shanks 10./U (Fig- 15,16) equipped with end hang loops 12., 11 formed in such thickness, which ranges approximately from one to three times , when compared with the arms 14,15 of lifting shanks 10., 11. Further difference is, that each taper 16 (Fig. 17, 18) of the lifting shanks 10, 11 is fitted with droplet-shaped guiding slot 24_, with the lower gradual portion for leading in the second warp thread. The lower part of the droplet-shaped guiding slot 24 forms the stop 22, designed as the bearing surface for the eye 5.
• the droplet-shaped guiding slot 24 is situated approximately in the medium portion of the contact portion 23 of the taper 16., and features a half-circular shape with the lower gradual portion.
• the droplet-shaped guiding slots 24. which are arranged mutually reflected so, that at the contact of both contact portions 23. of the lifting shanks 10, 11, form the prevailed circular orifice with the lower gradual portion.
• the droplet-shaped guiding slot 24. has no sharp edges, and the transitions 28 between guiding slot 24 and contact surfaces 23. of the taper 16., are rounded.
• This leno heddle 18 is suitable for the leno weaving of polypropylene fibres.
• the function and construction of the leno heddle 18. which illustrates Fig.19, is identical with preceding type, excepting the triangular guiding slot 25 of the shanks 10., 11.
• This triangular slot 25 is formed as a equilateral triangle so, that the angle between both identical guiding edges 26., 27, namely the upper guiding edge 26 adjacent to the contact portion 23. below the upper arm 14., and the lower guiding edge 27 adjacent to the contact portion 23 over the lower arm 15, is a right angle 90°.
• Both guiding edges 26., 27 are of the same length.
• a rhombus arises having the opposite legs of the same length.
• the leno heddle 18 of this type is suitable for weaving fine fibres with the tex number 34 and less.
• the leno heddle 18 of the type, illustrated by Fig. 22, in this alternative construction is identical with the preceding exemplary design, excepting the triangular guiding slot 29 . of the shanks 10, 11 of the lifting heddle 9 . , which is shaped in the form of irregular triangle (Fig. 23,24) so, that the angle between both guiding edges 26, 27, namely the upper guiding edge 26 adjacent by the contact portion 23 to the tapered edge 20, and the lower guiding edge 27 adjacent to the contact portion 23 . of the lower arm 15, is an acute angle less than 90°.
• an equilateral rhomboid is formed with the opposite sides of identical length.
• This solution of the leno heddle 18 is suitable for weaving textured fibres.
• the exemplary embodiments do not restrict the further variants and possibilities of the leno heddle 18, namely the shaping of guiding slots 21, 24 . , 25, 29., within the scope and thought of claims of this invention.
• the solution is designated for the weaving leno fabrics and their derivations, including the binding of selvages in the manufacture of current fabrics on the weaving machines of pneumatic, needle and gripper types.

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Citations (4)

• 1999
  • 1999-07-13 WO PCT/CZ1999/000023 patent/WO2000004214A1/en active Application Filing
  • 1999-07-13 DE DE19983381T patent/DE19983381T1/de not_active Withdrawn
  • 1999-07-13 SK SK67-2001A patent/SK286841B6/sk not_active IP Right Cessation

Patent Citations (4)

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