Note: Descriptions are shown in the official language in which they were submitted.
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The present invention relates to a warp-knitted
stringer tape for slide fasteners which is formed with
synthetic fiber yarnsO
There have been devised various warp-knitted stringer
tapes for slide fasteners which are formed with synthetic
fiber yarns. Since the stretch of such stringer tapes must
be minimized, it is necessary to select those yarns which
are highly resistant to stretchabilityO Accordingly, the
stitches in such knitted tapes are taut and tight, and the
faces and backs of the tapes are relatively hard and slippery~
The prior stringer tapes therefore tend to slip rela-
tively to garments while they are fed and sewn together by
the sewing machine, with the results that the tapes can be
skewed or displaced when attached, and the sewn tapes are
prone to become wrinkled or puckered, a condition that is
harmful in appearance and function to the slide fasteners.
Further, the stringer tape when shifted while being sewn
causes the sewing machine needle to fail to penetrate at a
selected interwale groove of the knit structure and to hit
an adjacent wale, resulting in a curved line of stitching
and a breakage of the sewing needle.
It has been known to lay textured yarn as weft threads
in the warp-knitted tape in an attempt to prevent the pucker-
ing of the tape. However, since the inlaid textured yarn
does not project from the waled face of the tape, such laid-
in tape has a limitation in choosing its surface to be applied
against the garment and thus has only met with a partial
success.
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109G189
An object of the present invention is to provide a
warp-knitted stringer tape for slide fasteners which has a
face and a back t~at are relatively rugged and are applicable
against the garment for sewing operation.
Another object of the present invention is to provide
a warp-knitted stringer tape for slide fasteners which has
a central web region that impose no positional limitation
on the sewin~ needle when it penetrates the web region.
Still another object of the present invention is to
provide a warp-knitted stringer tape for slidefasteners
which has a central web region that is elastic enough to
allow smooth sliding movement of the slider along the tape.
In general terms, the present invention provides a
stringer tape for slide fasteners, comprising a warp-
knitted structure made of synthetic fiber yarns including
textured yarn and non-textured yarn, said warp-knitted structure
being composed of a plurality of different patterns of stitches
forming wales, at least one of said different stitch patterns
being formed with said textured yarn, the stitch patterns other
than said at least one stitch pattern being formed with said
non-textured yarn, said warp-knitted structure including a pair
of spaced edge region and a web region extending between said
spaced edge regions, said web region comprising at least two
of said different stitch patterns, said two stitch patterns in
said web region consisting of tricot stitches formed with non-
textured yarn and single cord stitches formed with textured
yarn to render said wales relatively soft, flexible, and
penetratable by a sewing needle, the majority of said different
stitch patterns in said edge regions being formed with said
non-textured yarn, and the stitches of said textured yarn having
portions bulging on both surfaces of said warp-knitted structure
over said wales.
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In accordance with another aspect of the invention,
the warp-kn~tted structure comprises a double-faced fabric
made on two needle bars, at least one stitch pattern being
preferably formed on one of said two needle bars.
According to a further feature of the present invention,
stitch patterns in the edge regions are formed solely with
said non-textured yarn. The non-textured yarn stitch patterns
may include chain stitches and tricot stitches disposed
in said edge regions of said web region. According to a yet
another feature of the present invention, said web region
further includes a stitch pattern consisting of chain stitches
formed with textured yarn. In accordance with a still further
feature of the present invention, said web region further
includes a stitch pattern consisting of chain stitches formed
with non-textured yarn.
The above and other objectq and advantage~ of the
present invention will become apparent from the following
description when taken in conjunction with the accompanying
drawings.
Fig. 1 is an enlarged grap~ic represen~ation of a
warp-knitted atringer tape constructed in accordance with
the present invention, the stringer tape supporting coil
fastener elements;
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FigO 2 is an enlarged cross-sectional view taken
along line II - II of Fig. l;
Fig. 3 is a diagrammatic view of a stringer tape of
the invention;
S Fig. 4 is a diagrammatic view of a stringer tape
according to a first modification;
FigO 5 is a diagrammatic view showing a second modified
stxinger tape;
FigO 6 is a diagrammatic view of a t~ird modification;
FigO 7 is a diagrammatic view showing a stringer tape
of a fourth modification; and
FigO 8 is a diagrammatic view of a fifth modificationO
In Figs. 1 and 2, a stringer tape 10 for slide fasteners
which is constructed in accordance with the present invention
is of a warp-knitted structure made of synthetic fiber yarns
; including textured yarn 11 that i9 mechanically bulky, crimp-
ed, soft, and stretchy, The stitches 12 which are formed
with the textured yarn 11 thus project from or bulge on both
the face 13 and the back 14 of the warp-knitted structure.
The synthetic fiber yarns also include non-textured, normal
yarn 15 that cooperates with the textured yarn 11 in making
up the stringer tape 10.
; A stringer tape 16 as shown in Fig. 3 includes a pair
of spaced element-supporting edge regions 17,18 and a central
web region 19 extending between the edge regions 17,18.
The stringer tape 16 is formed with chain stitches 20 having
a stitch pattern of 1-0/0-1, tricot stitches 21 having a
stitch pattern of 1-2/1-0 (under 1 over 1), and single cord
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stitches 22 having a stitch pattern of 0-1/4-3 (under 3 over
1). Additionally, reinforcing warp threads 23 and 24 are
laid in two interwale grooves defined along one of the edge
regions 17,18 of the stringer tape, the inlaid warp threads
23,24 having a stitch pattern of 0-0/0-0. The tricot stitches
21 disposed in the edge regions 17,18 and the web region 19,
and the chain and single cord stitches 20,22 in the edge
regions 17,18 are formed with non-textured yarn 25, and the
, .
chain and single cord stitches 20,22 in the web region 19
are formed with textured yarn 26.
Since the textured yarn 26 has a greater stretchability
and bulkiness, the stitches 27 of the textured yarn 26 are
loose relatively to those of the non-textured yarn 25 just
after the warp-knitting has been completed. Further, since
the degree of shrinkage due to finishing processes such as
heat-setting and dyeing is greater for the non-textured yarn
25 than for the textured yarn 26, the stitches 28 of the non-
textured yarn 25 become additionally tight and the stitches
27 of the textured yarn 26 remain relatively loose after such
finishing processesO The finished stringer tape 16 has the
textured yarn stitches 27 bulging on its face and back due
partly to such loosely looped stitches 27 and due partly to
the bulkiness of the textured yarn 26. Accordingly, the
surfaces of the stringer tape 16 are rugged and have a
relatively large coefficient of friction, and the tape 16
can be prevented from slipping on the garment during sewing
operation, no matter which surface of the tape 16 is held
against the garment.
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The longitudinal and transverse stretch of the edge
regions 17,18 is held at a minimum by the chain stitches 20,
tricot stitches 21, and single cord stitches 22, all const-
ructed with the non-textured yarn 25. With the inlaid warp
threads 23,24, the edge region 17 is particularly stable
dimensionally to provide rigid support for fastener elements.
The web region 19, however, is relatively stretchable warpwise
andcoursewise because of inclusion therein of the textured
yarn 26 as the chain stitches 20 and the single cord stitches
22~ The stretchability of the web region 19 makes the stringer
tape 16 elastic enought to allow the fastener elements to
;~ be smoothly introduced into the slider as it moves for closing
the slide fastener. Further, with the textured yarn 26 thus
knitted in the web region 19, the web region 19 is uniformly
~` 15 soft and flexible, so that there will be only a small degreeof resistance to the passage therethrough of the sewing machine
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needle, and hence a line of stitching can be made as straight
as possible.
Fig. 4 shows a modified stringer tape 29 in which
chain stitches 30, tricot stitches 31, and single cord stitches
~` 32 in the web region 19 are all formed with textured yarn 33O
With this structure, the web region 19 has its both surfaces
more roughened by the textured yarn stitches for an increased
coefficient of friction, and the web region 19 is more
flexible for less resistance to the penetration therethrough
of the sewing needle.
According to Fig. 5, the web region 19 is devoid of
any chain stitches, and is formed only with tricot stitches
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34 and single cord stitches 35, both of textured yarn 36.
Therefore, the web region 19 is much more flexible, and
contraction or shrinkage thereof due to shifting by the
sewing threads of the stitches can be substantially done
away witho
In Fig. 6, the web region 19 comprises only single
` cord stitches 37 of textured yarn 38 and tricot stitches 39of non-textured yarn 400 Further, each edge region 17,18
,i,
-~ is formed with chain stitches 41 and tricot stitches 42, both
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made of non-textured yarn 43, and the single cord stitches
37 of the textured yarn 38. According to this modification,
the textured yarn stitches project from the stringer tape
,~ over its entire width, so that the stringer tape can be pre-
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~;~ vented from slipping on the garment more effectively. In
addition, the web region 19 is coarse and permits smooth
penetration of the sewing needle therethrough, and shrinkage
,~ thereof due to sewing operation is substantially eliminated.
....
Fig. 7 illustrates a stringer tape 44 of a double-faaed
structure knitted on a two needle bar knitting machine, the
tape comprising an element-supporting edge region 45 construct-
ed of a first group of single cord stitches 46,47 having
a stitch pattern of 2-0, 4-6/2-0, 4-6, a second group of
single cord stitches 48,49 having a stitch pattern of 4-6,
2-0/4-6, 2-0, and a reinforcing cord 50 laid as a warp thread
in the edge region 45 in a stitch pattern of 0-0, 0-0/0-0,
0-00 The single cord stitches 46,47,48 and 49 are formed with
non-textured yarn 510 The stringer tape 44 also comprises
a web region 52 and another edge region 53, both including
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chain stitches 54 made of non-textured yarn 51 and having
a stitch pattern of 0-2, 2-0/2-0, 0-2, tricot stitches 55
made of the non-textured yarn 51 and having a stitch pattern
of 2-0, 2-4/2-0, 2-4, and single cord stitches 56 made of
textured yarn 57 and having a stitch pattern of 8-6, 4-4/0-2,
4-4, the single cord stitches 56 being formed on either a
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front or a back needle bar of the knitting machine (the back
needle bar in the illustrated embodiment)O The single cord
stitches 56 may be knitted on both the front and back needle
barsO The single cord stitches 56 bulge on the face of the
tape 44 which is produced on the back needle barO Further,
by selecting a suitable thickness or denier for the textured
yarn 57, the sinker loops of the single cord stitch pattern
bulge on the tape face which is formed on the front needle
bar. Accordingly, both surfaces of the tape 44 have a
sufficient coefficient of frictionO The textured yarn 57
- is uniformly distributed over the web region 52 and thus
presents no areas where resistance to the pas~age of the ~`
sewing needle is locally increased.
In Fig. 8, the web region S2 is composed mainly of
ticot stitches 58 of non-textured yarn 59 and single cord
stitches 60 of textured yarn 61~ With this arrangement, the
web region 52 is relatively coarse so that it permits of smooth
.
penetration therethrough of the sewing needle, and will not
shrink under the influence of the sewing threads.
Although several preferred embodiments have been
described and illustrated, it should be understood that
various changes and modifications may be made therein without
departing from the scope of the appended claims.
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