Concealed woven slide fastener

In a concealed woven slide fastener stringer, a fastener tape is woven of foundation warp yarns and a double-pick foundation weft yarn, and a coiled fastener element is attached to folded inner margin of the tape by anchoring warp yarns and a double-pick anchoring weft yarn with coupling heads facing inwardly and connecting portions facing outwardly. The foundation weft yarn is interlaced with the outer one of two core cords inserted through the fastener element. The anchoring warp yarns cross the foundation weft yarn between the successive legs; one of the anchoring warp yarns is disposed between the coupling heads and the inner core cord, and two of the anchoring warp yarns are disposed between the core cords. The anchoring weft yarn is interlaced at one end with the outer anchoring warp yarn and at the other end with the foundation weft yarn crossing the inner anchoring warp yarn, thereby fixing the fastener element firmly.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
This invention relates to a concealed woven slide fastener in which coiled 
fastener element with core cords inserted therein is woven into a fastener 
tape along its folded inner margin by a needle weaving machine. 
2. Description of the Related Art 
FIG. 8 of the accompanying drawings shows a conventional concealed woven 
slide fastener stringer 3' in which a coiled fastener element 1', with a 
number of core cords 10' inserted therein is woven into a fastener tape 2' 
simultaneously with the weaving of the fastener tape 2', upper and lower 
legs 6', 6' being covered by a tubular weave structure and being tightened 
by tightening yarns 11' arranged at part of the tubular weave, thus fixing 
the coiled fastener element 1' to the fastener tape 2'. This prior art is 
exemplified by Japanese Utility Model Publication No. Sho 50-31131. 
FIG. 9 shows another conventional concealed woven slide fastener stringer 
2" in which a coiled fastener element 1", with legs 6" compressed flatly 
on the fastener tape surface and tightened by a number of tightening warp 
yarns 11" extending over the upper legs 6", is woven into a fastener tape 
2" by double-pick weaving using a needle weaving machine. This prior art 
is disclosed in Japanese Patent Publication No. Sho 46-7018. 
In the concealed woven slide fastener stringer 3' of the first-named prior 
art publication, partly since an increased number of parallel wrap yarns 
11' crossing the legs 6' are required in order to hold the fastener 
element 1' in position on the turnover portion 7' of the folded tape 
margin of the fastener tape 2' against possible transverse pulling forces, 
and partly since an increased number of core cords 10' also have to be 
inserted through the coiled fastener element 1', it is inevitable that the 
fastener element 1' would become rigid so that an adequately flexible 
slide fastener cannot be obtained. 
In the concealed woven slide fastener stringer 3" of the second-named prior 
art publication, since no core cord is inserted through the coiled 
fastener element 1", it is impossible to define the distances between the 
upper and lower legs 6", 6" uniformly and hence impossible to achieve a 
stable coupling-head pitch. Further, since the double-pick weft yarn 9" 
crosses the tightening warp yarns 11" extending over the upper and lower 
legs 6", 6" and simply turns at the turnover portion of the folded tape 
margin, the woven structure of the tape would be slack about the turnover 
portion due to the transverse pulling force so that the inner tape edge 
would be shift inwardly. As a result, the concealing function of the 
fastener element 1" is difficult to achieve. 
SUMMARY OF INVENTION 
A first object of this invention is to provide a concealed woven slide 
fastener stringer in which the distances between successive legs of a 
coiled fastener element are defined uniformly to achieve a stable 
coupling-head pitch and which has an adequate degree of flexibility and is 
stable in woven structure at a turnover portion of the fastener tape to 
resist against possible transverse pulling forces, thus concealing the 
fastener element effectively. 
A second object of the invention is to provide a concealed woven slide 
fastener stringer in which coiled fastener element and core cores are held 
together by arranging a number of anchoring warp warns in a specified 
manner, thus concealing the fastener element ore reliably. 
A third object of the invention is to provide a concealed woven slide 
fastener stringer in which a coiled fastener element and core cords are 
held together by arranging a double-pick weft yarn in a specified pattern, 
thereby concealing the fastener element more reliably. 
A fourth object of the invention is to provide a concealed woven slide 
fastener stringer in which a foundation weft yarn of a woven fastener tape 
is interlaced with core cords which are inserted through a coiled fastener 
element, to reinforce a fastener-element-mounting margin of the fastener 
tape, thereby facilitating concealing the fastener element. 
According to a first aspect of the invention, the first object is 
accomplished by a concealed woven slide fastener stringer comprising: a 
fastener tape woven of a plurality of foundation warp yarns and a 
double-pick foundation weft yarn; a coiled fastener element attached to a 
folded inner margin of said fastener tape by a number of anchoring warp 
yarns and a double-pick anchoring weft yarn which are woven in said 
fastener tape simultaneously with weaving of the fastener tape, and having 
a succession of coupling heads facing inwardly, a succession of connecting 
portions, and a succession of upper and lower legs; a plurality of core 
cords inserted through the coiled fastener element at a side toward the 
connecting portions and sandwiched between the upper and lower legs; and 
the anchoring warp yarns extending over said upper legs and being 
interlaced with said foundation weft yarn, said anchoring weft yarn being 
interlaced with some of said anchoring warp yarns which extend between 
said core cords, and extending over one of said core cords which is 
disposed on a side toward said coupling heads, and crossing said 
foundation warp yarns at a turnover portion of the folded inner margin of 
the fastener tape. 
The second object is accomplished by a concealed woven slide fastener 
stringer, in which some of said anchoring warp yarns are arranged between 
said one core cord and said coupling heads and between said core cords, 
extend over said upper legs of the fastener element and cross said 
foundation weft yarn and said anchoring weft yarn, thereby fixing said 
fastener element firmly. 
The third object is accomplished by a concealed woven slide fastener 
stringer having the foregoing feature, in which said anchoring weft yarn 
is interlaced at one end with said anchoring warp and is interlaced at the 
other end with said foundation weft yarn at said turnover portion of said 
folded inner margin of said fastener tape. 
The third object is accomplished alternatively by a concealed slide 
fastener stringer having any of the foregoing features, in which said 
anchoring weft yarn is interlaced at one end with some of said anchoring 
warp yarns which extend between said core cords, extends over said core 
cords, crosses at the other end said foundation warp yarns at said 
turnover portion of said folded inner margin of said fastener tape, and 
extends along with said foundation weft yarn. 
The fourth object is accomplished by a concealed slide fastener having any 
of the foregoing features, in which said foundation weft yarn is 
interlaced at one end with said core cords inserted through said fastener 
element at a side toward said connecting portions.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
Preferred embodiments of a concealed woven slide fastener stringer 
according to this invention will now be described in detail with reference 
to the accompanying drawings. 
As shown in FIGS. 1 through 4, a concealed woven slide fastener stringer 3 
of this invention comprises a woven fastener tape 2, and a coiled fastener 
element 1 in the form of a monofilament, which is made of thermoplastic 
synthetic resin such as polyamide and polyester, woven in the fastener 
tape 2 along its one inner margin. The fastener element 1 has a succession 
of coupling heads 4, a succession of connecting portions 5, and a 
succession of sets of upper and lower legs 6. The coiled fastener element 
1 is woven into the fastener tape 2 so as that the coupling heads 4 face 
inwardly of the fastener tape 2, simultaneously with the weaving of the 
fastener tape 2. The fastener tape 2 is folded at the inner margin to form 
a turnover portion 7 near and along the coupling heads 4 as shown in FIG. 
2, and then is shaped by a heat treatment process, so as to be a fastener 
stringer 3. 
The fastener tape 2 is woven of a plurality of foundation warp yarns 8 and 
a double-pick foundation weft yarn 9 as shown in FIG. 3. The coiled 
fastener element 1, through which two core cords 10 are inserted along the 
inner margin of the fastener tape 2, is woven so as that the connecting 
portions 5 face outwardly of the fastener tape 2. At that time, the 
foundation weft yarn 9 is interlaced with the core cord 10 disposed on a 
side toward the connecting portions 5 of the fastener element 1. 
Further, a single anchoring warp yarn 11, which is disposed between the 
coupling heads 4 and the inner core cord 10, and two anchoring warp yarns 
11, which are disposed between the inner and outer core cords 10,10, are 
arranged so as to extend over the upper legs 6 and cross one of two pairs 
of double-pick foundation weft yarns 9 inlaid twice between the successive 
legs 6, thereby fixing the fastener element 1 firmly. 
On the other hand, the anchoring warp yarns 11 are interlaced with or cross 
the double-pick weft yarn 12 as shown in FIGS. 3 and 4. For example, the 
anchoring weft yarn 12 is interlaced at one end with the double-pick 
foundation weft yarn 9, which is inlaid twice between the successive legs 
6 of the fastener element 1, extends an outer surface of the inner core 
cord 10, and is interlaced at the other end with the anchoring warp yarn 
11, which is disposed toward the connecting portions 5 between the inner 
and outer core cords 10. And the anchoring weft yarn 12 extends over the 
upper legs 6, is inlaid again and simply crosses the anchoring warp yarn 
11 extending adjacent to the anchoring warp yarns 11 on the 
connecting-portion side. Thus the fastener element 1 is fixed firmly. 
In the concealed woven slide fastener stringer 3 of the first embodiment, 
the number of the core cords 1 inserted through the coiled fastener 
element 1 is two. Alternatively, the number of core cords 10 may be 
increased depending on the size and shape of the fastener element 1. The 
number of anchoring warp yarns 11 also may be increased as desired. 
Further, it is free to vary the number of the inlaids of the anchoring 
weft yarns 12 according to the size of the fastener element 1. 
The inner core cord 10 which is disposed at a side toward the coupling 
heads 4 is firmly pressed against the fastener tape 2 by the foundation 
warp yarns 8 and the double-pick weft yarn 12 interlaced with the 
anchoring warp yarn 11 disposed between the core cords 10, and at the same 
tie, the fastener element 1 is pressed against the fastener tape 2. The 
outer core cord 10 which is disposed at a side toward the connecting 
portions 5 is interlaced with the double-pick foundation weft yarn 9 and 
is thereby pressed against the fastener tape 2, and at the same time, the 
lower legs 6 of the fastener element 1 are pressed against the fastener 
tape 2. Further, the upper legs 6 are tightened by the anchoring warp and 
weft yarns 11, 12. As a result, the coiled fastener element 1 is firmly 
fixed to the inner margin of the fastener tape 2. 
FIGS. 5 and 6 show a concealed woven slide fastener stringer according to a 
second embodiment of this invention. In the second embodiment, the 
fastener stringer 3 is woven by the same weaving means as in the first 
embodiment; namely, a fastener tape 2 is woven of foundation warp and weft 
yarns 8, 9, and a coiled fastener element 1 is woven in and along an 
folded inner margin of the fastener tape 2. In this embodiment, unlike the 
first embodiment, anchoring weft yarns 12 are interlaced with an outermost 
anchoring warp yarn 11 extending over the legs 6, then cross an adjacent 
anchoring warp yarn 11 which is disposed at a side toward the coupling 
heads 4, extend over the outer surface of the inner core cord 10 between 
the inner and outer core cords 10, 10, and then cross an anchoring warp 
yarn 11 disposed between the coupling heads 4 and the inner core cord 10, 
whereupon the anchoring weft yarns 12 cross the foundation warp yarn 8 at 
a turnover portion 7 of the inner margin of the fastener tape 2 and are 
inlaid in double pick, as a set together with the foundation weft yarns 9, 
to the edge of the fastener tape 2. The remaining woven structure of this 
fastener stringer 3 is identical with that of the foregoing embodiment. 
FIG. 7 shows a concealed woven slide fastener stringer according to a third 
embodiment of this invention. In this fastener stringer 3 of this 
embodiment, a coiled fastener element 1, in which with three core cords 10 
inserted is woven in a woven fastener tape 2. Each anchoring warp yarn 11 
is disposed between the three core cords 10 respectively. An anchoring 
weft yarn 12 is interlaced with one of the anchoring warp yarns 11, which 
is disposed at a side toward the coupling heads 4, and with the other 
anchoring warp yarn 11, which is disposed between the inner core cord 10 
disposed at a side toward the coupling heads 4 and the adjacent 
intermediate core cord 10, while it extends over the outer surface of the 
inner core cord 10. As a result, the fastener element 1 is firmly fixed to 
the fastener tape 2. 
With concealed woven slide fastener stringer of this invention, it is 
possible to obtain the following advantageous results. 
According to a first aspect of the invention, the coiled fastener element 1 
with a number of core cords inserted at a side toward the connection 
portions is woven into the fastener tape 2, simultaneously while the 
fastener tape 2 is woven of foundation warp yarns 8 and a double-pick 
foundation weft yarn 9. Further, a number of core cords 10 are inserted in 
the fastener element 1 at a side toward the connecting portions 5. 
Furthermore, the fastener element 1 is tightened by anchoring warp end 
weft yarns 11, 12 woven into the fastener tape 2. Accordingly, it requires 
only a simple weaving means, and it is possible to fix the fastener 
element 1 firmly. 
More specifically, partly since the anchoring warp yarns 11 extend over the 
upper legs 6 of the fastener element 1 and is interlaced with the 
foundation weft yarn 9, partly since the core cords 10 are sandwiched 
between the upper and lower legs 6, 6, and partly since the anchoring weft 
yarn 12 is interlaced with the anchoring warp yarn 11 disposed between the 
core cords 10, 10, extends over the outer surface of the inner core cord 
10 at a side toward the coupling heads 4 and cross the remaining weaving 
yarns at the turnover tape portion 7, it is possible to stabilize the 
fastener element pitch, to tighten the inserted core cords 10 firmly by 
the anchoring weft yarn 12 to fix the fastener element 1 firmly and 
reliably by the combination of the anchoring warp and weft yarns 11, 12 
and the core cords 10, and to conceal the fastener element 1 reliably. 
Further, if the turnover portion 7 of the fastener tape 2 is processed by 
heat treatment, it is possible to maintain a function of concealing the 
fastener element for a long period of time. 
According to a second aspect of the invention, since a number of anchoring 
warp yarns 11 are disposed between the inner core cord 10 and the coupling 
heads 4 and between the inner and outer core cords 10, 10, extend over the 
upper legs 6 and cross the foundation weft yarn 9 and the anchoring weft 
yarn 11, it is possible to hold the fastener element 1 and the core cords 
10 together by the anchoring weft yarn so that the fastener element 1 can 
fixed firmly, thus causing a reliable concealing function. 
According to a third aspect of the invention, since the anchoring weft yarn 
12 is interlaced at one end with the anchoring warp yarns 11 which are 
disposed between the core cords 10, 10, extends over the core cords 10, 10 
and is interlaced at the other end with the foundation weft yarn 9 at the 
turnover portion 7 of the fastener tape 2, it is possible to tighten the 
core cords 10 firmly on the fastener tape surface by the anchoring weft 
yarn 12 so that the fastener element 1 and the core cords 10 can be held 
together reliably, thus concealing the fastener element 1 effectively. 
Further, since the anchoring weft yarn 12 extends between the anchoring 
warp yarns 11, 11, it is possible to finish the fastener tape 2 adequately 
flexible. 
According to a fourth aspect of the invention, since the anchoring weft 
yarn 12 is interlaced at one end with the anchoring warp yarns 11, which 
are disposed between the core cords 10, extends over the core cords 10, 
cross the foundation warp yarns 8 at the turnover tape portion 7 and then 
extend along with the foundation weft yarn 9, it is possible to tighten 
the core cords 10 firmly on the fastener tape surface by the anchoring 
weft yarn 12 so that the fastener element 1 and the core cords 10 are held 
together reliably, thus concealing the fastener element 1 effectively. 
Further, since anchoring weft yarn 12 is inlaid in the outer anchoring 
warp yarn 11 and the outer edge of the fastener tape 2 via the outer 
anchoring warp yarn 11 and the turnover tape portion 7, it is possible to 
increase the thickness of the fastener tape portion, thus finishing the 
fastener tape 2 adequately tough. 
According to the fifth aspect of the invention, since the foundation weft 
yarn 9 is interlaced at one end with the outer core cord which is disposed 
at a side toward the connecting portions 5 of the fastener element 1, it 
is possible to hold the core cords 10 firmly against the fastener tape 
surface also by the foundation weft yarn 9, thus facilitating fixing the 
fastener element 1 firmly.