CA1108510A - Woven tape with a row of connecting elements for a zip fastener and its method of manufacture - Google Patents
Woven tape with a row of connecting elements for a zip fastener and its method of manufactureInfo
- Publication number
- CA1108510A CA1108510A CA331,062A CA331062A CA1108510A CA 1108510 A CA1108510 A CA 1108510A CA 331062 A CA331062 A CA 331062A CA 1108510 A CA1108510 A CA 1108510A
- Authority
- CA
- Canada
- Prior art keywords
- warp
- weft
- base fabric
- threads
- single filament
- 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
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 238000000034 method Methods 0.000 title claims description 11
- 239000004744 fabric Substances 0.000 claims abstract description 40
- 238000003780 insertion Methods 0.000 claims description 12
- 230000037431 insertion Effects 0.000 claims description 12
- 238000009941 weaving Methods 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 239000004753 textile Substances 0.000 claims description 3
- 230000002730 additional effect Effects 0.000 claims 1
- 235000014676 Phragmites communis Nutrition 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 210000002105 tongue Anatomy 0.000 description 3
- 238000010009 beating Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- 230000003935 attention Effects 0.000 description 1
- 230000008859 change Effects 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
- 230000006870 function Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
- A44B19/00—Slide fasteners
- A44B19/42—Making by processes not fully provided for in one other class, e.g. B21D53/50, B21F45/18, B22D17/16, B29D5/00
- A44B19/52—Securing the interlocking members to stringer tapes while making the latter
- A44B19/54—Securing the interlocking members to stringer tapes while making the latter while weaving the stringer tapes
-
- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
- A44B19/00—Slide fasteners
- A44B19/24—Details
- A44B19/40—Connection of separate, or one-piece, interlocking members to stringer tapes; Reinforcing such connections, e.g. by stitching
- A44B19/406—Connection of one-piece interlocking members
Landscapes
- Woven Fabrics (AREA)
- Slide Fasteners (AREA)
- Looms (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The invention relates to the manufacture of a woven tape with a row of connecting elements for zip fasteners consisting in a base fabric having a lower side and an upper side, a synthetic single filament wound so as to take the shape of a spiral fixed to the longitudinal border of the tape.
Each coil of the spiral comprises a shaped end portion, two arms which are superimposed one upon the other in a plane perpendicular to the border of the tape and a connecting portion of the arms of successive coils.
The fixation or securing of the single filament to the base fabric takes place by three warp threads and one additional weft thread, the three warp threads being alternately interwoven with the additional weft thread and with that forming the base fabric so as to form loops binding the shaped single filament to the base fabric.
Fig. 1
The invention relates to the manufacture of a woven tape with a row of connecting elements for zip fasteners consisting in a base fabric having a lower side and an upper side, a synthetic single filament wound so as to take the shape of a spiral fixed to the longitudinal border of the tape.
Each coil of the spiral comprises a shaped end portion, two arms which are superimposed one upon the other in a plane perpendicular to the border of the tape and a connecting portion of the arms of successive coils.
The fixation or securing of the single filament to the base fabric takes place by three warp threads and one additional weft thread, the three warp threads being alternately interwoven with the additional weft thread and with that forming the base fabric so as to form loops binding the shaped single filament to the base fabric.
Fig. 1
Description
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The present invention relates to a woven tape with a row of connecting elements for zip fasteners and also to a method for its mar.ufacture.
It is known that zip fasteners comprise two tapes each having level with a longitudinal border a row of connecting elements intended to be mutually coupled or uncoupled by means of a slider.
i~851~
The invention specifically relates to those tapes for zip fasteners having a row of connecting elements formed by a continuous synthetic single filament wound in a spiral or folded in meander fashion, the preformed meander or spiral being fixed to the border of the tape during the weaving operation o-f the tape itself.
One of the main problems in this type of tape for zip fasteners lies in providing a reliable and strong fastening of said spiral or meander to the border of the tape so as to prevent, during usage of the zip fastener, movement or deformation of the individual coils of the spiral or meander.
Many attempts have been made to solve this problem but the solutions proposed have not been found to be entirely successful in all respects.
Therefore, it is the object of the presènt invention to devise a tape for zip fasteners, wherein the system of fastening the row of connecting elements is improved in such a way as to ensure a reliable and strong attachment and to make possible simple manufacture using ribbon needle looms.
To solve this problem the invention provides a woven tape having a reversible or two-sided base fabric formed by the textile interlacing of warp and weft threads, on one side of which level with a longitudinal border is fastened as the warp, by means of warp and weft threads, a continuous synthetic single filament wound in spiral form, or folded in meander fashion, each coil of the spiral or meander comprising a shaped end portion level with the border of the tape, two arms emerging from the end portion and which are substantially superimposed on one another in ~ 3510 a plane generally perpendicular to said border, and a portion for joining the arrn of one coil and the arm o-f the succeeding coil on the opposite side of the end portion, the tape being characterised in that for attaching the shaped single filament to the base fabric there are provided three warp threads and one additional weft thread in higheT
plane than that of the weft thread forming the base fabric, said three warp threads being alternately interwoven with the additional weft thread and with that which forms the base fabric so as to form loops binding the shaped single filament to the base fabric, the loops of one of said warp threads being arranged overlapping the superimposed arms of each coil, those loops of the second warp thread being arranged between the superimposed pairs of arms of successive coils, and those of the third warp thread being arranged overlapping the portions for connecting the coils, the additional weft thread forming a warp overlapping the upper arms of the coils and adjoining the upper part of the loops of said first warp thread.
It has been found that the binding of the single filament to the base fabric of the tape, effected by means of the warp threads alternately interwoven with the weft forming the base fabric and an additional upper wet, ensures that it is securely locked with the coils firmly held by the loops formed by said warp threads, so as to prevent any displacement or deformation thereof.
The connecting portions of the coils are not covered with binding threads, so that they afford perfect guidance for the slider of the zip fastener. Even the end portions of the coils, which constitute the actual connecting and coupling elements, are completely free and are held in 1~8510 an upright position perpendicular to the border and to the upper side of the support tape, thus ensuring satisfactory operation of the zip fastener.
The method according to the invention, for the manufacture of woven tape with a row of connecting elements, provides ~he weaving of a base fabric with warp and weft threads, the feeding as a warp of a continuous synthetic single filament previously shaped in spiral or meander form in the zone of one longitudinal border of the base fabric above the respective weaving plane, and the simultaneous binding of the shaped single filament to the base fabric by means of warp and weft threads, said method being characterised by the use of three warp threads for the binding of the shaped single filament to the base fabric and of one additional weft thread acting in a weaving plane above that in which the weft for the formation of the base fabric works, said method being further characterised in that, during successive insertions of the wefts, two of said three warp threads are alternately raised and lowered in the shed, while the third one is simultaneously lowered and raised therein, so as to interweave them alternately with the upper weft and with the weft forming the base fabric, in that the shaped single filament is caused to move forward so as to carry out one forward step for every two weft insertions, in that the two of the three warp threads always situated on opposite sides of the shed are fed into a zone above the pairs of superimposed arms of the coils of the shaped single filament, whereas the third warp thread : is fed into a zone displaced towards the connecting portions , . - ~
of the coils, and in that the additional weft is closed in waTp fashion on the opposite side to the insertion side of the weft.
The method according to the invention makes possible reliable operation at high productivity on a ribbon needle loom, which only necessitates a few simple modifica-tions with respect to a conventional loom of this type.
In the following description reference will be essentially made to the case in which the continuous synthetic single filament is spiral-shaped, but it is to be understood that the invention is not restricted to this case and also covers that in which the single filament takes the shape of a meander.
The invention will be illustrated in more detail below with reference to the accompanying drawings, in which Figure 1 shows in plan view on a greatly en-larged scale the border zone of the tape on which the spiral-shaped single filament is fastened ;
Figure 2 is a cross-section along the line II-II in Figure 1 ;
Figure 3 is a side view in elevation, in the direction of the arrow III in Figure 1, of the tape in the process of formation in the weaving zone in one stage thereof ;
Figures 4 to 9 are plan views of the weaving zone in various successive stages of operation, and ., ~ 5 5~LO
Figure 10 shows a detail in elevation viewed in the direction of arrow X in Figure 4.
Referring firstly to Figures l - 3, it is evident that the tape with the row of connecting elements according to the invention comprises a base fabric, generally designated lO, formed by the textile interweaving of a weft thread 11 with a suitable number of warp threads 12. This base fabric 10 has a lower side and an upper side and this latter side (see in particular Figure 2), in a border zone designated 13, has applied to it a spiral 14 formed by a continuous synthethic single filament wound so as to take the shape of a spiral.
Each coil of this spiral 14 comprises a shaped end portion 15 arranged level with the border of the tape, two arms 16, 17 which emerge from said end portion :.;
15 and which are substantially superimposed one upon the other in a plane perpendicular to the border of the tape and to its two sides, and a portion 18 for connecting the upper arm 16 of one coil and the lower arm 17 of the next coil. This connecting portion 18 is situated on the opposite side to the end portion 15.
For binding and attaching the spiral 14 to the border ~one 13 of the base fabric 10 there are provided three warp threads, respectively designated A, B and C, together with an additional weft thread D above the weft thread D above ~he weft thread 11 which forms the base fabric lO.
These warp threads A? B and C are alternately interwoven with the weft thread 11 and with the additional weft D so as to form loops for binding the spiral 14 to the base fabric 10. More particularly, the warp thread A forms loops 20 which are situated between successive coil5 of the spiral 14; the warp thread B forms loops 21 situated over-lapping the pair of arms 16, 17 of each coil ; and the warp thread C forms loops 22 arranged overlapping the portions 18 connecting the coils of the spiral 14. Furthermore, as clearly shown in Figures 1 and 3, the additional weft thread D is fastened so as to form a warp 23 situated over-lapping the upper arms 16 of the coils and adjacent the upper part of the loops 21 of the warp thread B.
It is evident that in this way the spiral 14 is entirely secured and held firmly in its position above ;~ the border zone 13 of the support tape. Its single coils are thoroughly and securely locked against any displacement ; or deformation and, moreover, are kept at a constant distance apart.
It is possible to use a suitably modified ribbon needle loom for the manufacture of the tape and the ~: simultaneous binding of the shaped spiral 14 to its border zone 13.
Since the loom itself does not form part of the present invention, in the examples only those members of the loom are illustrated which are indispensable for understanding the mode of operation. It is understood, however, that it is a question of a conventional ribbon loom well known in the art.
The loom comprises a double needle having a lower leg 25 and an upper leg 26 shorter than the former ;
the lower leg 25 of the double needle serves to insert the weft thread 11, passing through an eye provided at its end, for the formation of the base fabric, whereas the shorter upper leg 26 serves to insert the additional weft thread D, passing through an eye provided at its end (see Figures 4 to 9). It is evident that the weft thread 11 works in a lower weaving plane and the thread D works in ; an upper plane. For the formation of the closing warps with the weft threads 1l and D ,on the opposite side with respect to the side for inserting the wefts ~on the right as shown ; in Figures 4 - 9), there are provided in different planes two needles 27, 28 with tongues, both needles being mounted on a carriage 29 which is capable of reciprocating motion in the direction of the arrows in Figures 4 - 9 above a : cross member 30 of the loom. This cross member has a passage 31 (see Figure 10) for the tape produced and in the area where the border zone 13 of the tape is formed this passage 31 is increased in height and is surmounted by a plate 32 which is adjustably mounted by means of a screw 33 and which ;~ 20 has at the front a vee-shaped edge.
A tube 34 feeding the spiral l4 performed from a continuous synthethic single filament terminates in front of this plate 32 and at the highest part 35 of the passage 31. The tube 34 is situated in the same vertical plane as the part 35 of the passage 31 and is slightly inclined with its end portion (see Figure 3) which is suitably spaced apart from the plate 32.
The usual reed 36 is also provided for beating up the weft, the movements of which are synchronised with 1~8~i~0 the movements of the double needle 25-26 and of the carriage 29. Of course, the movements of the warp threads for forming the shed are controlled in the normal manner by healds or heddles (not shown) in the same way as the advance of the tape produced is controlled, likewise in perfect coordination with the movements of the other members of the loom.
The method for the manufacture of the tape according to the invention, with simultaneous binding of the spiral-shaped single filament 14 to the border zone 13, using the ribbon needle loom briefly described above takes ; place in the following manner.
It has to be taken into account that the rate of advance of the tape produced and, therefore, of the single filament spiral 14 is so adjusted that said spiral advances by one step (i.e. by a distance equal to that ~ between the centre lines of two successive coils) for every ; two weft insertions.
The formation of the base fabric 10 of the tape takes place conventionally by interweaving the weft 11 with a suitable number of warp threads 12.
In the following description particular atten-tion is paid to the binding of the spiral 14 on to the upper side of the border zone 13 of the tape being produced.
As already mentioned, this binding is effected using three warp threads A, B and C and one additional weft thread D inserted by means of the upper leg 26 of the double needle and bound to warp 23 by means of the needle 28 with a tongue.
In a first weft-inserting opera~ion (figures 3 to 6), the weft thread D is situated at the bottom of the 85~
shed in which the additional weft D is inserted.
At this point it is to be noted that all these warp threads A, B, C, independently of their position in the shed, always pass above the feeding tube 34 for the spiral 14~ which tube has on its upper front edge a notch 37 for guiding these warp threads. Moreower, it is also to be noted that the warp threads A and B always arrive slightly from the left (as evident from Figures 4 to 9) and the warp thread C slightly from the right of the tube 34, this posi-tioning being determined by the passage of said warp threads between corresponding teeth of the reed 36 and by the posi-tioning of the associated control healds.
Figure 4 shows the insertion stage of the wefts 11 and D in this first operation. It will be noted that the weft D passes between the raised warp threads~A, C
; and the warp thread B resting on the tube 34. The double needle 25-26 advances until the wefts 11, D are hooked by the respective needles 27, 28 with tongues, after which the double needle starts its return travel, while the carriage 29 with the needles 27, 28 and the reed commence the;r forward movement downwards, as shown in Figure 5.
During this movement, the needle 28,which withdraws the weft D, effects the insertion of the warp thread B into the space between two successive coils of the spiral.
The warp thread B, which originates from a preceding connection with the upper weft D and in the mean-time the spiral 14 having moved ahead, has to surmount the advanced coil by overlapping said coil and forming the upper part of a loop 21.
Therefore, the needle 28 releases preceding stitch formed with the weft thread D. Shortly before the reed 36 effects beating up ~Figure 6), the warp threads A, B, C are acted upon by the associated healds so as to close the shed.
Subsequently, the position of the wa~p threads A, B, C in the shed is reversed, the threads A and C
move downwards and the thread B moves upwards, thus causing the interweaving of warp threads A and C with the upper weft D, and of warp thread B with the lower weft 11 which forms the base fabric.
There now commences a second weft-inserting operation (Figures 7 to 9). The weft D is inserted between the raised warp thread B and those A and C resting on the tube 3~ ~Figure 7) until it is hooked by the needle 28. The double needle 25-26 then starts its return travel and the carriage 29 with the needles 27-28, which carriage has in the meantime been returned together with the reed 36, resumes its forward movement. During this movement, the weft D pulled by the advancing needle 28, effects the insertion of the warp thread A into the space between two coils of the spiral 14 (Figure 8). It is to be noted that, since the spiral 14 has only moved forwards by half a step in the meantime, the warp thread A originating from the previous connection with the weft D is inserted in the same space between two coils in which, during the preceding opera-tion, the warp thread B has been inserted. Therefore, the warp thread A does not have to surmount any coils, but its connection point with the upper weft D is stabilised in the space between the two successive coils in a position deter-~33853.!C~
mined automatically by the tensions of the weft D and of the warp thread A.
Simultaneously the weft thread D pulled by the needle 28 causes the warp thread C to overlap a connecting portion 18 of the coils of the spiral.
Thereafter, the needle 28 releases the stitch located thereon and , just before the reed 36 effects tightening of the weft threads (Figure 9), while the warp threads A, B and C are acted upon so as to close the shed.
The position of the warp threads A, B and C
in the shed is thus once again reversed, so that the ~` :
threads A and C are raised while thread B is lowered. This determines the connection of the lower weft ll by the warp threads A and C and of the upper weft D by the warp thread B.
The conditions prevailing at the start of the first stage of insertion of the weft threads, as described above, are thus again reached.
The preceding explanations show that the method of the invention is applicable with extremely simple means and without complicating operations of the ribbon needle loom the productivity of which can be substantially increased.
The invention has been described with refe-rence to an embodiment which can be modified in many aspects without leaving the scope of the invention.
Thus, as already mentioned, the spiral shape of winding or curving of the synthethic single filament, can be modified so that the latter may to assume a shape 11~385~0 similar to a meander. Moreaover, if desired, the internal space of the spiral may be occupied in per se known manner by a continuous filling or reinforcing thread.
In the case of a meander-shaped single fila-ment, said meander may be folded up into a U and the connecting portions are alternately located at the top and at the bottom so as to join together respectively the upper arms of two successive coils and the lower arms of two successive coils. In this case it may be advantageous to bind to the base fabric of the support tape, using loops formed by the third warp thread C, the pairs of lower arms in the vicinity of the associated connecting portion, whereas the other two warp threads A and B fulfil the same function as described above for the case in which the single filament is spiral-shaped. For the purpose of obtaining this type of binding of the warp threadC, it is necessary to act on it so that every four insertions of weft it is brought only once into the upper position of the shed, rather than cause it to change position alternately, as occurs in the case of the warp thread A. If desired, it is even possible to use the warp thread C to bind the pairs of upper arms in the vicinity of the associated connecting portion to the case fabric, but in this case, in order avoid folding these upper arms towards the upper side of the base fabric, it may be advisable to fill the space enclosed by the meander folded into a U with a suitable filling core.
It is clear to the expert that numerous further modifications may be made according to the specific design of folding of the synthethic single filament, but still using for its fastening only three warp threads and one additional weft th~ead.
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The present invention relates to a woven tape with a row of connecting elements for zip fasteners and also to a method for its mar.ufacture.
It is known that zip fasteners comprise two tapes each having level with a longitudinal border a row of connecting elements intended to be mutually coupled or uncoupled by means of a slider.
i~851~
The invention specifically relates to those tapes for zip fasteners having a row of connecting elements formed by a continuous synthetic single filament wound in a spiral or folded in meander fashion, the preformed meander or spiral being fixed to the border of the tape during the weaving operation o-f the tape itself.
One of the main problems in this type of tape for zip fasteners lies in providing a reliable and strong fastening of said spiral or meander to the border of the tape so as to prevent, during usage of the zip fastener, movement or deformation of the individual coils of the spiral or meander.
Many attempts have been made to solve this problem but the solutions proposed have not been found to be entirely successful in all respects.
Therefore, it is the object of the presènt invention to devise a tape for zip fasteners, wherein the system of fastening the row of connecting elements is improved in such a way as to ensure a reliable and strong attachment and to make possible simple manufacture using ribbon needle looms.
To solve this problem the invention provides a woven tape having a reversible or two-sided base fabric formed by the textile interlacing of warp and weft threads, on one side of which level with a longitudinal border is fastened as the warp, by means of warp and weft threads, a continuous synthetic single filament wound in spiral form, or folded in meander fashion, each coil of the spiral or meander comprising a shaped end portion level with the border of the tape, two arms emerging from the end portion and which are substantially superimposed on one another in ~ 3510 a plane generally perpendicular to said border, and a portion for joining the arrn of one coil and the arm o-f the succeeding coil on the opposite side of the end portion, the tape being characterised in that for attaching the shaped single filament to the base fabric there are provided three warp threads and one additional weft thread in higheT
plane than that of the weft thread forming the base fabric, said three warp threads being alternately interwoven with the additional weft thread and with that which forms the base fabric so as to form loops binding the shaped single filament to the base fabric, the loops of one of said warp threads being arranged overlapping the superimposed arms of each coil, those loops of the second warp thread being arranged between the superimposed pairs of arms of successive coils, and those of the third warp thread being arranged overlapping the portions for connecting the coils, the additional weft thread forming a warp overlapping the upper arms of the coils and adjoining the upper part of the loops of said first warp thread.
It has been found that the binding of the single filament to the base fabric of the tape, effected by means of the warp threads alternately interwoven with the weft forming the base fabric and an additional upper wet, ensures that it is securely locked with the coils firmly held by the loops formed by said warp threads, so as to prevent any displacement or deformation thereof.
The connecting portions of the coils are not covered with binding threads, so that they afford perfect guidance for the slider of the zip fastener. Even the end portions of the coils, which constitute the actual connecting and coupling elements, are completely free and are held in 1~8510 an upright position perpendicular to the border and to the upper side of the support tape, thus ensuring satisfactory operation of the zip fastener.
The method according to the invention, for the manufacture of woven tape with a row of connecting elements, provides ~he weaving of a base fabric with warp and weft threads, the feeding as a warp of a continuous synthetic single filament previously shaped in spiral or meander form in the zone of one longitudinal border of the base fabric above the respective weaving plane, and the simultaneous binding of the shaped single filament to the base fabric by means of warp and weft threads, said method being characterised by the use of three warp threads for the binding of the shaped single filament to the base fabric and of one additional weft thread acting in a weaving plane above that in which the weft for the formation of the base fabric works, said method being further characterised in that, during successive insertions of the wefts, two of said three warp threads are alternately raised and lowered in the shed, while the third one is simultaneously lowered and raised therein, so as to interweave them alternately with the upper weft and with the weft forming the base fabric, in that the shaped single filament is caused to move forward so as to carry out one forward step for every two weft insertions, in that the two of the three warp threads always situated on opposite sides of the shed are fed into a zone above the pairs of superimposed arms of the coils of the shaped single filament, whereas the third warp thread : is fed into a zone displaced towards the connecting portions , . - ~
of the coils, and in that the additional weft is closed in waTp fashion on the opposite side to the insertion side of the weft.
The method according to the invention makes possible reliable operation at high productivity on a ribbon needle loom, which only necessitates a few simple modifica-tions with respect to a conventional loom of this type.
In the following description reference will be essentially made to the case in which the continuous synthetic single filament is spiral-shaped, but it is to be understood that the invention is not restricted to this case and also covers that in which the single filament takes the shape of a meander.
The invention will be illustrated in more detail below with reference to the accompanying drawings, in which Figure 1 shows in plan view on a greatly en-larged scale the border zone of the tape on which the spiral-shaped single filament is fastened ;
Figure 2 is a cross-section along the line II-II in Figure 1 ;
Figure 3 is a side view in elevation, in the direction of the arrow III in Figure 1, of the tape in the process of formation in the weaving zone in one stage thereof ;
Figures 4 to 9 are plan views of the weaving zone in various successive stages of operation, and ., ~ 5 5~LO
Figure 10 shows a detail in elevation viewed in the direction of arrow X in Figure 4.
Referring firstly to Figures l - 3, it is evident that the tape with the row of connecting elements according to the invention comprises a base fabric, generally designated lO, formed by the textile interweaving of a weft thread 11 with a suitable number of warp threads 12. This base fabric 10 has a lower side and an upper side and this latter side (see in particular Figure 2), in a border zone designated 13, has applied to it a spiral 14 formed by a continuous synthethic single filament wound so as to take the shape of a spiral.
Each coil of this spiral 14 comprises a shaped end portion 15 arranged level with the border of the tape, two arms 16, 17 which emerge from said end portion :.;
15 and which are substantially superimposed one upon the other in a plane perpendicular to the border of the tape and to its two sides, and a portion 18 for connecting the upper arm 16 of one coil and the lower arm 17 of the next coil. This connecting portion 18 is situated on the opposite side to the end portion 15.
For binding and attaching the spiral 14 to the border ~one 13 of the base fabric 10 there are provided three warp threads, respectively designated A, B and C, together with an additional weft thread D above the weft thread D above ~he weft thread 11 which forms the base fabric lO.
These warp threads A? B and C are alternately interwoven with the weft thread 11 and with the additional weft D so as to form loops for binding the spiral 14 to the base fabric 10. More particularly, the warp thread A forms loops 20 which are situated between successive coil5 of the spiral 14; the warp thread B forms loops 21 situated over-lapping the pair of arms 16, 17 of each coil ; and the warp thread C forms loops 22 arranged overlapping the portions 18 connecting the coils of the spiral 14. Furthermore, as clearly shown in Figures 1 and 3, the additional weft thread D is fastened so as to form a warp 23 situated over-lapping the upper arms 16 of the coils and adjacent the upper part of the loops 21 of the warp thread B.
It is evident that in this way the spiral 14 is entirely secured and held firmly in its position above ;~ the border zone 13 of the support tape. Its single coils are thoroughly and securely locked against any displacement ; or deformation and, moreover, are kept at a constant distance apart.
It is possible to use a suitably modified ribbon needle loom for the manufacture of the tape and the ~: simultaneous binding of the shaped spiral 14 to its border zone 13.
Since the loom itself does not form part of the present invention, in the examples only those members of the loom are illustrated which are indispensable for understanding the mode of operation. It is understood, however, that it is a question of a conventional ribbon loom well known in the art.
The loom comprises a double needle having a lower leg 25 and an upper leg 26 shorter than the former ;
the lower leg 25 of the double needle serves to insert the weft thread 11, passing through an eye provided at its end, for the formation of the base fabric, whereas the shorter upper leg 26 serves to insert the additional weft thread D, passing through an eye provided at its end (see Figures 4 to 9). It is evident that the weft thread 11 works in a lower weaving plane and the thread D works in ; an upper plane. For the formation of the closing warps with the weft threads 1l and D ,on the opposite side with respect to the side for inserting the wefts ~on the right as shown ; in Figures 4 - 9), there are provided in different planes two needles 27, 28 with tongues, both needles being mounted on a carriage 29 which is capable of reciprocating motion in the direction of the arrows in Figures 4 - 9 above a : cross member 30 of the loom. This cross member has a passage 31 (see Figure 10) for the tape produced and in the area where the border zone 13 of the tape is formed this passage 31 is increased in height and is surmounted by a plate 32 which is adjustably mounted by means of a screw 33 and which ;~ 20 has at the front a vee-shaped edge.
A tube 34 feeding the spiral l4 performed from a continuous synthethic single filament terminates in front of this plate 32 and at the highest part 35 of the passage 31. The tube 34 is situated in the same vertical plane as the part 35 of the passage 31 and is slightly inclined with its end portion (see Figure 3) which is suitably spaced apart from the plate 32.
The usual reed 36 is also provided for beating up the weft, the movements of which are synchronised with 1~8~i~0 the movements of the double needle 25-26 and of the carriage 29. Of course, the movements of the warp threads for forming the shed are controlled in the normal manner by healds or heddles (not shown) in the same way as the advance of the tape produced is controlled, likewise in perfect coordination with the movements of the other members of the loom.
The method for the manufacture of the tape according to the invention, with simultaneous binding of the spiral-shaped single filament 14 to the border zone 13, using the ribbon needle loom briefly described above takes ; place in the following manner.
It has to be taken into account that the rate of advance of the tape produced and, therefore, of the single filament spiral 14 is so adjusted that said spiral advances by one step (i.e. by a distance equal to that ~ between the centre lines of two successive coils) for every ; two weft insertions.
The formation of the base fabric 10 of the tape takes place conventionally by interweaving the weft 11 with a suitable number of warp threads 12.
In the following description particular atten-tion is paid to the binding of the spiral 14 on to the upper side of the border zone 13 of the tape being produced.
As already mentioned, this binding is effected using three warp threads A, B and C and one additional weft thread D inserted by means of the upper leg 26 of the double needle and bound to warp 23 by means of the needle 28 with a tongue.
In a first weft-inserting opera~ion (figures 3 to 6), the weft thread D is situated at the bottom of the 85~
shed in which the additional weft D is inserted.
At this point it is to be noted that all these warp threads A, B, C, independently of their position in the shed, always pass above the feeding tube 34 for the spiral 14~ which tube has on its upper front edge a notch 37 for guiding these warp threads. Moreower, it is also to be noted that the warp threads A and B always arrive slightly from the left (as evident from Figures 4 to 9) and the warp thread C slightly from the right of the tube 34, this posi-tioning being determined by the passage of said warp threads between corresponding teeth of the reed 36 and by the posi-tioning of the associated control healds.
Figure 4 shows the insertion stage of the wefts 11 and D in this first operation. It will be noted that the weft D passes between the raised warp threads~A, C
; and the warp thread B resting on the tube 34. The double needle 25-26 advances until the wefts 11, D are hooked by the respective needles 27, 28 with tongues, after which the double needle starts its return travel, while the carriage 29 with the needles 27, 28 and the reed commence the;r forward movement downwards, as shown in Figure 5.
During this movement, the needle 28,which withdraws the weft D, effects the insertion of the warp thread B into the space between two successive coils of the spiral.
The warp thread B, which originates from a preceding connection with the upper weft D and in the mean-time the spiral 14 having moved ahead, has to surmount the advanced coil by overlapping said coil and forming the upper part of a loop 21.
Therefore, the needle 28 releases preceding stitch formed with the weft thread D. Shortly before the reed 36 effects beating up ~Figure 6), the warp threads A, B, C are acted upon by the associated healds so as to close the shed.
Subsequently, the position of the wa~p threads A, B, C in the shed is reversed, the threads A and C
move downwards and the thread B moves upwards, thus causing the interweaving of warp threads A and C with the upper weft D, and of warp thread B with the lower weft 11 which forms the base fabric.
There now commences a second weft-inserting operation (Figures 7 to 9). The weft D is inserted between the raised warp thread B and those A and C resting on the tube 3~ ~Figure 7) until it is hooked by the needle 28. The double needle 25-26 then starts its return travel and the carriage 29 with the needles 27-28, which carriage has in the meantime been returned together with the reed 36, resumes its forward movement. During this movement, the weft D pulled by the advancing needle 28, effects the insertion of the warp thread A into the space between two coils of the spiral 14 (Figure 8). It is to be noted that, since the spiral 14 has only moved forwards by half a step in the meantime, the warp thread A originating from the previous connection with the weft D is inserted in the same space between two coils in which, during the preceding opera-tion, the warp thread B has been inserted. Therefore, the warp thread A does not have to surmount any coils, but its connection point with the upper weft D is stabilised in the space between the two successive coils in a position deter-~33853.!C~
mined automatically by the tensions of the weft D and of the warp thread A.
Simultaneously the weft thread D pulled by the needle 28 causes the warp thread C to overlap a connecting portion 18 of the coils of the spiral.
Thereafter, the needle 28 releases the stitch located thereon and , just before the reed 36 effects tightening of the weft threads (Figure 9), while the warp threads A, B and C are acted upon so as to close the shed.
The position of the warp threads A, B and C
in the shed is thus once again reversed, so that the ~` :
threads A and C are raised while thread B is lowered. This determines the connection of the lower weft ll by the warp threads A and C and of the upper weft D by the warp thread B.
The conditions prevailing at the start of the first stage of insertion of the weft threads, as described above, are thus again reached.
The preceding explanations show that the method of the invention is applicable with extremely simple means and without complicating operations of the ribbon needle loom the productivity of which can be substantially increased.
The invention has been described with refe-rence to an embodiment which can be modified in many aspects without leaving the scope of the invention.
Thus, as already mentioned, the spiral shape of winding or curving of the synthethic single filament, can be modified so that the latter may to assume a shape 11~385~0 similar to a meander. Moreaover, if desired, the internal space of the spiral may be occupied in per se known manner by a continuous filling or reinforcing thread.
In the case of a meander-shaped single fila-ment, said meander may be folded up into a U and the connecting portions are alternately located at the top and at the bottom so as to join together respectively the upper arms of two successive coils and the lower arms of two successive coils. In this case it may be advantageous to bind to the base fabric of the support tape, using loops formed by the third warp thread C, the pairs of lower arms in the vicinity of the associated connecting portion, whereas the other two warp threads A and B fulfil the same function as described above for the case in which the single filament is spiral-shaped. For the purpose of obtaining this type of binding of the warp threadC, it is necessary to act on it so that every four insertions of weft it is brought only once into the upper position of the shed, rather than cause it to change position alternately, as occurs in the case of the warp thread A. If desired, it is even possible to use the warp thread C to bind the pairs of upper arms in the vicinity of the associated connecting portion to the case fabric, but in this case, in order avoid folding these upper arms towards the upper side of the base fabric, it may be advisable to fill the space enclosed by the meander folded into a U with a suitable filling core.
It is clear to the expert that numerous further modifications may be made according to the specific design of folding of the synthethic single filament, but still using for its fastening only three warp threads and one additional weft th~ead.
.~
.
Claims (2)
1. A woven tape with a row of connecting elements for zip fasteners having a two-sided base fabric formed by the textile interweaving of warp and weft threads, on one of the sides of the base fabric level with a longi-tudinal border there being fastened as the warp, by means of warp and weft threads, a continuous synthetic single filamend shaped in the form of a spiral or meander forming said row of connecting elements, each coil of the spiral or meander comprising a shaped end portion level with the border of the tape, two arms emerging from the end portion and which are substantially superimposed on one another in a plane generally perpendicular to said border, and a portion for joining the arm of one coil and the arm of the succeeding coil on the opposite side of the end portion, characterised by the following features :
A/ for attaching the shaped single filament to the base fabric there are provided three warp threads and one additional weft thread in a higher plane than that of the weft thread forming the-base fabric;
B/ the three warp threads are alternately interwoven with the additional weft thread and with that forming the base fabric so as to form loops binding the shaped single filament to the base fabric, the loops of one of said warp threads being arranged to overlap the superimposed arms of each coil, those loops of the second warp thread being arranged between the superimposed pairs of arms of successive coils, and those of the third warp thread being arranged to overlap the portions for connecting the coils, the additional left forming a warp overlapping the upper arms of the coils and adjoining the upper part of the loops of said first warp thread.
A/ for attaching the shaped single filament to the base fabric there are provided three warp threads and one additional weft thread in a higher plane than that of the weft thread forming the-base fabric;
B/ the three warp threads are alternately interwoven with the additional weft thread and with that forming the base fabric so as to form loops binding the shaped single filament to the base fabric, the loops of one of said warp threads being arranged to overlap the superimposed arms of each coil, those loops of the second warp thread being arranged between the superimposed pairs of arms of successive coils, and those of the third warp thread being arranged to overlap the portions for connecting the coils, the additional left forming a warp overlapping the upper arms of the coils and adjoining the upper part of the loops of said first warp thread.
2. A method for the manufacture of a tape with a row of connecting elements for zip fasteners according to claim 1, the said method providing the weaving of a base fabric with warp and weft threads, the feeding as a warp of a continuous synthetic single filament previously shaped in spiral or meander form in the zone of one longitu-dinal border of the fabric above the respective weaving plane, and the simultaneous binding of the shaped single filament to the base fabric by means of warp and weft threads, there being used for binding the shaped single filament to the base fabric of three warp threads and one additional weft thread acting in a weaving plane above that in which works the weft for the formation of the base fabric ; during successive insertions of the wefts, two of said three warp threads are alternately raised and lowered in the shed, while the third one is simultaneously lowered and raised therein, so as to interweave them alternately with the upper weft and with the weft forming the base fabric ; the shaped single filament is caused to move forward so as to carry out one forwardstep for every two weft insertions ; the two of three warp threads always situated on opposite sides of the shed are fed into a zone above the pairs of super-imposed arms of the coils of the shaped single filament, whereas the third warp thread is fed into a zone displaced towards the connecting portions of the coils ; the addi-tional weft is closed in warp fashion on the opposite side to the insertion side of the weft.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT25362A/78 | 1978-07-05 | ||
| IT25362/78A IT1097459B (en) | 1978-07-05 | 1978-07-05 | FABRIC TAPE WITH ROW OF CONNECTION ELEMENTS FOR ZIP CLOSURE AND METHOD FOR ITS MANUFACTURE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1108510A true CA1108510A (en) | 1981-09-08 |
Family
ID=11216473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA331,062A Expired CA1108510A (en) | 1978-07-05 | 1979-06-29 | Woven tape with a row of connecting elements for a zip fastener and its method of manufacture |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS5536380A (en) |
| BE (1) | BE877335A (en) |
| BR (1) | BR7904222A (en) |
| CA (1) | CA1108510A (en) |
| DE (1) | DE2856734A1 (en) |
| ES (1) | ES482217A1 (en) |
| FR (1) | FR2430467A1 (en) |
| GB (1) | GB2029465A (en) |
| IT (1) | IT1097459B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3708088A1 (en) * | 1986-04-15 | 1987-10-22 | Naegele Feinmaschinenbau | Slide fastener consisting of woven stringer tapes and inwoven, prefabricated rows of fastener members |
-
1978
- 1978-07-05 IT IT25362/78A patent/IT1097459B/en active
- 1978-12-29 DE DE19782856734 patent/DE2856734A1/en not_active Withdrawn
-
1979
- 1979-06-28 GB GB7922447A patent/GB2029465A/en not_active Withdrawn
- 1979-06-28 BE BE0/196013A patent/BE877335A/en unknown
- 1979-06-29 CA CA331,062A patent/CA1108510A/en not_active Expired
- 1979-07-04 JP JP8407179A patent/JPS5536380A/en active Pending
- 1979-07-04 BR BR7904222A patent/BR7904222A/en unknown
- 1979-07-04 ES ES482217A patent/ES482217A1/en not_active Expired
- 1979-07-05 FR FR7917936A patent/FR2430467A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5536380A (en) | 1980-03-13 |
| BR7904222A (en) | 1980-03-18 |
| BE877335A (en) | 1979-10-15 |
| IT1097459B (en) | 1985-08-31 |
| FR2430467A1 (en) | 1980-02-01 |
| FR2430467B3 (en) | 1981-04-30 |
| IT7825362A0 (en) | 1978-07-05 |
| ES482217A1 (en) | 1980-08-16 |
| DE2856734A1 (en) | 1980-01-17 |
| GB2029465A (en) | 1980-03-19 |
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| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |