U.S. patent application number 15/022059 was filed with the patent office on 2016-08-04 for selvage portion gripping device for loom, loom, and method of manufacturing woven fabric.
This patent application is currently assigned to Toray Industries, Inc.. The applicant listed for this patent is Toray Industries, Inc.. Invention is credited to Koji Shimada, Nobuaki Tanaka, Hiroshi Tsuchikura.
Application Number | 20160222555 15/022059 |
Document ID | / |
Family ID | 52688826 |
Filed Date | 2016-08-04 |
United States Patent
Application |
20160222555 |
Kind Code |
A1 |
Tanaka; Nobuaki ; et
al. |
August 4, 2016 |
SELVAGE PORTION GRIPPING DEVICE FOR LOOM, LOOM, AND METHOD OF
MANUFACTURING WOVEN FABRIC
Abstract
A device is capable of reducing occurrence of cloth fell retreat
at a selvage portion of a woven fabric and warp yarn looseness in a
base cloth selvage portion when a high-density woven fabric is
woven at a high speed. The selvage portion gripping device for a
loom has a space where a selvage portion can pass in which the
selvage portion formed by weaving additional yarns and weft yarns
can pass through in a woven fabric forwarding direction, a small
space where the weft yarn can move in which the weft yarn can move
in the woven fabric forwarding direction, and a means to maintain a
woven condition of the selvage portion even when the weft yarn is
cut with a weft yarn cutter.
Inventors: |
Tanaka; Nobuaki; (Otsu-shi,
JP) ; Tsuchikura; Hiroshi; (Otsu-shi, JP) ;
Shimada; Koji; (Otsu-shi, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Toray Industries, Inc. |
Tokyo |
|
JP |
|
|
Assignee: |
Toray Industries, Inc.
Tokyo
JP
|
Family ID: |
52688826 |
Appl. No.: |
15/022059 |
Filed: |
September 12, 2014 |
PCT Filed: |
September 12, 2014 |
PCT NO: |
PCT/JP2014/074267 |
371 Date: |
March 15, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
D03D 49/70 20130101;
D03D 47/308 20130101; D03D 47/44 20130101 |
International
Class: |
D03D 47/44 20060101
D03D047/44; D03D 49/70 20060101 D03D049/70 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 17, 2013 |
JP |
2013-191624 |
Claims
1-7. (canceled)
8. A loom on which a weft yarn nozzle, a weft yarn cutter, and a
selvage portion gripping device are mounted, wherein the selvage
portion gripping device comprises a space where a selvage portion
can pass in which the selvage portion formed by weaving additional
yarns and weft yarns can pass through in a woven fabric forwarding
direction, a tiny space where the weft yarn can move in which the
weft yarn can pass through, and a device that maintains a woven
condition of the selvage portion even when the weft yarn is cut
with a weft yarn cutter, the selvage portion gripping device is
only disposed at a weft yarn nozzle side of the woven fabric, or
the selvage portion gripping device is disposed both at the weft
yarn nozzle side of the woven fabric and an opposite side of the
weft yarn nozzle, when the selvage portion gripping device is
disposed at the weft yarn nozzle side, the weft yarn cutter is
provided between the weft yarn nozzle and the selvage portion
gripping device, and when the selvage portion gripping device is
disposed at the opposite side of the weft yarn nozzle, the selvage
portion gripping device is provided between the other weft yarn
cutter provided at the opposite side of the weft yarn nozzle and
the woven fabric.
9. The loom according to claim 8, wherein the device that maintains
the woven condition of the selvage portion in the selvage portion
gripping device is an elastic part that catches the selvage portion
existing in the space where the selvage portion can pass.
10. The loom according to claim 9, wherein the elastic part that
catches the selvage portion is a part formed of a plate spring, or
an elastic member and a plate material.
11. A loom on which a weft yarn nozzle, a weft yarn cutter, and a
selvage portion gripping device are mounted, wherein the selvage
portion gripping device comprises a space where a selvage portion
can pass in which the selvage portion formed by weaving additional
yarns and weft yarns can pass through in a woven fabric forwarding
direction, a small space where the weft yarn can move in which the
weft yarn can pass through, and an elastic part which catches the
selvage portion, the selvage portion gripping device is only
disposed at a weft yarn nozzle side of the woven fabric, or the
selvage portion gripping device is disposed both at the weft yarn
nozzle side of the woven fabric and an opposite side of the weft
yarn nozzle, when the selvage portion gripping device is disposed
at the weft yarn nozzle side, the weft yarn cutter is provided
between the weft yarn nozzle and the selvage portion gripping
device, and when the selvage portion gripping device is disposed at
the opposite side of the weft yarn nozzle, the selvage portion
gripping device is provided between the other weft yarn cutter
provided at the opposite side of the weft yarn nozzle and the woven
fabric.
12. A method of manufacturing a woven fabric where a predetermined
number of warp yarns are parallelized, additional yarns are
parallelized on an outside of the parallelized warp yarns, and a
weft yarn is supplied to the warp yarns and the additional yarns,
comprising: by using the loom according to claim 8, gripping a
selvage portion by a selvage portion gripping device for a loom
that exists in the loom at the time of cutting the weft yarn.
13. The method according to claim 12, further comprising gradually
separating the additional yarns from the selvage portion discharged
from the selvage portion gripping device for the loom.
14. A method of manufacturing a woven fabric where a predetermined
number of warp yarns are parallelized, additional yarns are
parallelized on an outside of the parallelized warp yarns, and a
weft yarn is supplied to the warp yarns and the additional yarns,
comprising: after the weft yarn is supplied and the woven fabric is
subjected to reed beating, gripping a selvage portion formed by
weaving the additional yarns and the weft yarns when the weft yarn
is cut between the weft yarn at a side where the weft yarn is
supplied and the selvage portion formed by weaving additional yarns
and weft yarns.
15. The method according to claim 14, wherein when the weft yarn at
the side where the weft yarn is supplied is further cut, the
selvage portion formed by weaving the additional yarns and the weft
yarns is gripped between the woven fabric and the cut portion.
16. The method according to claim 14, wherein the additional yarn
has a total fineness larger than total fineness of the weft
yarn.
17. A selvage portion gripping device for a loom mounted on a loom,
the selvage portion gripping device comprising: a space where a
selvage portion can pass in which the selvage portion formed by
weaving additional yarns and weft yarns can pass through in a woven
fabric forwarding direction; and a small space where the weft yarn
can move in which the weft yarn can pass through, wherein the
selvage portion gripping device is only disposed at a weft yarn
nozzle side of the woven fabric, or the selvage portion gripping
device is disposed both at the weft yarn nozzle side of the woven
fabric and an opposite side of the weft yarn nozzle, when the
selvage portion gripping device is disposed at the weft yarn nozzle
side of the woven fabric, a weft yarn cutter is provided between
the weft yarn nozzle and the selvage portion gripping device, when
the selvage portion gripping device for the loom is disposed at the
opposite side of the weft yarn nozzle, the selvage portion gripping
device is provided between the woven fabric and the weft yarn
cutter which is allocated at the opposite side of the weft yarn
nozzle and, accordingly, the selvage portion gripping device for
the loom comprises a means for maintaining a woven condition of the
selvage portion even when the weft yarn is cut with the weft yarn
cutter of the loom.
18. The selvage portion gripping device according to claim 17,
further having an elastic part that catches the selvage
portion.
19. The method according to claim 12, wherein the additional yarn
has a total fineness larger than total fineness of the weft
yarn.
20. The method according to claim 14 comprising gradually
separating the additional yarns from the selvage portion discharged
from the selvage portion gripping device for the loom.
21. The method according to claim 20, wherein the additional yarn
has a total fineness larger than total fineness of the weft yarn.
Description
TECHNICAL FIELD
[0001] This disclosure relates to a selvage portion gripping device
for a loom. More specifically, the disclosure relates to a selvage
portion gripping device for a loom that effectively suppresses
occurrence of warp yarn looseness in a base cloth selvage portion
that occurs near a selvage portion when a high-density woven fabric
is woven, a loom equipped with the device, and a method of
manufacturing the woven fabric using the device.
BACKGROUND
[0002] Conventionally, there have been proposed a large number of
high-density woven fabrics using a synthetic fiber multifilament
including polyester and nylon. Due to diversification of uses, a
woven fabric that is further made thin or is highly strengthened
accompanying this diversification has been requested.
[0003] Generally, when the high-density woven fabric is woven, as a
cover factor thereof becomes larger, an amount of movement of a
cloth fell from a reed beating portion to a forwarding side of a
warp yarn becomes larger. Because of this, the following
inconveniences occur. [0004] It should be noted that the cover
factor is a value expressed by
(D1.times.0.9).sup.1/2.times.N1+(D2.times.0.9).sup.1/2.times.N2,
wherein total fineness of a warp yarn is D1 (dtex), warp yarn
density is N1 (yarns/2.54 cm), total fineness of a weft yarn is D2
(dtex), and weft yarn density is N2 (yarns/2.54 cm. [0005] (a) The
woven fabric near the reed beating portion undergoes a bumping
phenomenon, and it becomes hard to obtain a woven fabric having a
desirable weft yarn density. [0006] (b) The warp yarn induces fluff
and weaving cannot be stably performed. [0007] (c) When a loom
rotation speed is made high, a phenomenon in which the amount of
movement of the cloth fell of the selvage portion from the reed
beating portion to the forwarding side of the warp yarn becomes
larger appears more conspicuously. Due to warp yarn looseness at
the selvage portion, a cloth length difference between the selvage
portion and a central portion occurs, and a waving phenomenon, that
is, a so-called warp yarn looseness in a base cloth salvage portion
(also referred to as "Mimitarumi" or "Mimitaburi" in Japanese)
appears. The woven fabric is formed into a desirable product by
cutting and sewing. To effectively utilize the woven fabric to the
maximum for a target use, the woven fabric is usually used up to
near an end portion of the woven fabric. Ends of a cut part easily
unravel. Accordingly, when the warp yarn looseness in the base
cloth selvage portion occurs near the selvage portion, poor cutting
occurs, a shape as a product cannot be secured, or a function is
not fulfilled. [0008] (d) The warp yarn looseness in the base cloth
selvage portion in a gray fabric not only hinders each processing
passing property of a roll winding process, a scouring process, and
a heat set process, but also becomes a cause for creating wrinkles
on the obtained woven fabric.
[0009] As a technology to suppress occurrence of warp yarn
looseness in the base cloth selvage portion, a method in which
weaving density of a selvage portion is made higher than weaving
density of a main body part of a woven fabric at the time of
weaving (Japanese Patent Laid-open Publication No. H09-302549), a
method in which additional yarns are beaten up into a selvage
portion formed of ground yarns and binding yarns (Japanese Patent
Laid-open Publication No. H09-302550), a method in which a binding
yarn having a hetero-cross-section is used for a part of a
plurality of additional yarns provided at an outside of the woven
fabric (Japanese Patent Laid-open Publication No. 2001-355143), a
method in which a section shape of a warp yarn at a selvage portion
is made flat (Japanese Patent Laid-open Publication No.
2003-221749), and the like are known. However, it cannot be always
said that these technologies are capable of sufficiently
suppressing occurrence of the warp yarn looseness in the base cloth
selvage portion.
[0010] Apart from the above-described technologies, a method in
which, by an air jet loom or a water jet loom, a pair of grip
rollers is provided at an arrival portion of a running weft yarn,
tension for breaking the weft yarn running is applied to the weft
yarn for a predetermined time until reed beating of a cloth fell is
completed, and spring back of the warp yarn is held down (Japanese
Patent Laid-open Publication No. H10-46445), and a method in which
a device which tightens a weft yarn similarly provided at an
arrival portion of a weft yarn is driven and controlled (Japanese
Patent Laid-open Publication No. H10-298850) are known.
[0011] However, the above-described conventional technologies have
a problem in that complicated control is required to grip the
running weft yarn, which thereby leads to an increase in cost of
manufacturing the woven fabric.
[0012] In consideration of the drawbacks of the above-described
conventional technologies, it could be helpful to provide a selvage
portion gripping device for a loom capable of effectively
suppressing occurrence of cloth fell retreat at a selvage portion
or warp yarn looseness in a base cloth selvage portion when a
high-density woven fabric is woven at a high speed, a loom, and a
method of manufacturing the woven fabric.
SUMMARY
[0013] We thus provide: [0014] (1) A selvage portion gripping
device to be mounted on a loom, the selvage portion gripping device
including: a space where a selvage portion can pass in which the
selvage portion formed by weaving additional yarns and weft yarns
can pass through in a woven fabric forwarding direction; a tiny
space where the weft yarn can move in which the weft yarn can pass
through; and a means for maintaining a woven condition of the
selvage portion even when the weft yarn is cut with a weft yarn
cutter of the loom. [0015] (2) The selvage portion gripping device
for the loom, wherein the means for maintaining the woven condition
of the selvage portion is a flexible part which catches the selvage
portion allocated in the space where the selvage portion can pass.
[0016] (3) The selvage portion gripping device for the loom
according to claim 2, wherein the flexible part which catches the
selvage portion is a part formed of a plate spring or a flexible
member and a plate material. [0017] (4) A loom having any of the
selvage portion gripping devices for the loom, wherein the selvage
portion gripping device exists at a selvage portion of a woven
fabric and at a position where a weft yarn is cut with a weft yarn
cutter. [0018] (5) A method of manufacturing a woven fabric where a
predetermined number of warp yarns are parallelized, additional
yarns are parallelized at an outside of the parallelized warp
yarns, and a weft yarn is supplied to the warp yarns and the
additional yarns, including: by using the loom, gripping a selvage
portion by a selvage portion gripping device for a loom which
exists on the loom at the time of cutting the weft yarn. [0019] (6)
The method of manufacturing the woven fabric, includes: gradually
separating the additional yarns from the selvage portion discharged
from the selvage portion gripping device for the loom. [0020] (7) A
method of manufacturing a woven fabric where a predetermined number
of warp yarns are parallelized, additional yarns are parallelized
at an outside of the parallelized warp yarns, and a weft yarn is
supplied to the warp yarns and the additional yarns, including:
after the weft yarn is supplied and the woven fabric is subjected
to reed beating, gripping a selvage portion formed by weaving the
additional yarns and the weft yarns at the time of cutting the weft
yarn.
[0021] When weaving is performed by using the selvage portion
gripping device for the loom, the selvage portion is disposed
inside the selvage portion gripping device and configured to
maintain the woven condition thereof. Accordingly, occurrence of
crimp of the weft yarn can be prevented, looseness of the warp yarn
can be prevented, and warp yarn looseness in a base cloth selvage
portion can be effectively suppressed. Similarly, when weaving is
performed by using the selvage portion gripping device for the
loom, the selvage portion inside the selvage portion gripping
device for the loom is flexibly caught by the flexible part which
catches the selvage portion. Accordingly, forwarding of the selvage
portion is performed more smoothly, and the woven condition between
the additional yarns and the weft yarns are maintained more
reliably. Consequently, occurrence of the crimp of the weft yarn
can be prevented, the looseness of the warp yarn can be prevented,
and the warp yarn looseness in the base cloth selvage portion can
be effectively suppressed.
[0022] Further, when weaving is performed by using the selvage
portion gripping device for the loom, the flexible part which
catches the selvage portion is a part formed of a plate spring or a
flexible member and a plate material. Accordingly, a structure is
simple and inexpensive, forwarding of the selvage portion is
performed more smoothly, and the woven condition between the
additional yarns and the weft yarns is maintained further reliably.
Consequently, occurrence of cloth fell retreat at the selvage
portion of the woven fabric and the warp yarn looseness in the base
cloth selvage portion can be suppressed more effectively and
inexpensively.
[0023] When weaving is performed by using the loom, weaving can be
performed while occurrence of cloth fell retreat at the selvage
portion of the woven fabric or the warp yarn looseness in the base
cloth selvage portion is suppressed more effectively.
[0024] Further, according to the weaving method, the selvage
portion is disposed inside the selvage portion gripping device and
is configured to maintain the woven condition thereof. Accordingly,
it is possible to obtain a woven fabric in which occurrence of the
crimp of the weft yarn can be prevented, the looseness of the warp
yarn is prevented, and warp yarn looseness in the base cloth
selvage portion is effectively suppressed.
[0025] The additional yarns are separated from the selvage portion
discharged from the selvage portion gripping device together with
the movement of the woven fabric. Accordingly, cutting work of the
selvage portion is not required, and the selvage portion can be
reused by winding the additional yarns separately.
[0026] Further, according to the weaving method, the selvage
portion is configured to maintain the woven condition thereof.
Accordingly, it is possible to obtain a woven fabric in which
occurrence of the crimp of the weft yarn can be prevented, the
looseness of the warp yarn is prevented, and the warp yarn
looseness in the base cloth selvage portion is effectively
suppressed.
[0027] In the weaving method, the weaving is performed by a loom
which uses fluid to insert the weft yarn such as a water jet loom,
the selvage portion gripping device for the loom is installed at a
side of a weft yarn nozzle which is a nozzle for beating the weft
yarn, and even when the weft yarn is cut between the weft yarn
nozzle and the selvage portion gripping device for the loom with a
weft yarn cutter, the selvage portion is disposed inside the
selvage portion gripping device and is configured to maintain the
woven condition thereof. Accordingly, occurrence of the crimp of
the weft yarn can be prevented, the looseness of the warp yarn can
be prevented, and the warp yarn looseness in the base cloth selvage
portion can be effectively suppressed.
BRIEF DESCRIPTION OF THE DRAWINGS
[0028] FIG. 1 is a schematic plan view showing a main part of a
loom which includes a selvage portion gripping device for a
loom.
[0029] FIG. 2 is a schematic perspective view showing the selvage
portion gripping device for the loom.
[0030] FIG. 3 is a schematic sectional view of the selvage portion
gripping device for the loom which uses a pair of plate springs as
a flexible part which catches a selvage portion.
[0031] FIG. 4 is a schematic sectional view of the selvage portion
gripping device for the loom which uses the pair of plate springs
as the flexible part which catches the selvage portion.
[0032] FIG. 5 is a diagram showing an evaluation method of warp
yarn looseness in a base cloth selvage portion.
DESCRIPTION OF REFERENCE SIGNS
[0033] 1: Warp yarn [0034] 2: Additional yarn [0035] 3: Reed [0036]
4: Weft yarn nozzle [0037] 5: Weft yarn [0038] 6: Weft yarn cutter
[0039] 7: Selvage portion gripping device for loom [0040] 8: Fringe
[0041] 9: Edge dent of reed [0042] 10: Woven fabric [0043] 11:
Selvage portion [0044] 71A: Inlet of space where selvage portion
can pass [0045] 71B: Outlet of space where selvage portion can pass
[0046] 72A: Tiny space where weft yarn can move and which is
allocated at weft yarn nozzle side [0047] 72B: Tiny space where
weft yarn can move and which is allocated at woven fabric side
[0048] 73: Bolt [0049] 74A, 74B: Plate springs [0050] 75A, 75B:
Plate spring supporting bodies [0051] 101A: End portion allocated
at weft yarn nozzle side of woven fabric [0052] 101B: End portion
allocated at side which is not weft yarn nozzle side of woven
fabric [0053] 102A, 102B: Marks at central portions of woven fabric
[0054] 103A, 103B: Lines along weft yarn [0055] 104A, 104B: Lines
along warp yarn [0056] L, R: Strips [0057] X: Direction of weft
yarn [0058] Y: Direction of warp yarn
DETAILED DESCRIPTION
[0059] Hereinafter, examples will be described by using drawings
and the like.
[0060] A selvage portion gripping device for a loom is a selvage
portion gripping device for a loom which has a space where a
selvage portion can pass in which the selvage portion formed by
weaving an additional yarn and a weft yarn can pass through in a
woven fabric forwarding direction and a tiny space where a weft
yarn can move in which the weft yarn can move in the woven fabric
forwarding direction. The selvage portion gripping device further
has a means that maintains a woven condition of the selvage portion
even when the weft yarn is cut with a weft yarn cutter.
[0061] It should be noted that a fringe is a weft yarn supplied
from a weft yarn nozzle, and then cut and protruded from the woven
fabric. The additional yarn is a yarn inserted into an outside of
the woven fabric in a warp direction to catch the fringe apart from
a ground yarn of the woven fabric. Since the weft yarns are
weft-inserted into the additional yarns as with the warp yarns, a
condition in which the additional yarns and the weft yarns are
intersected by vertically changing their positions, i.e., a woven
condition, is formed. The selvage portion is a portion where the
fringes and the additional yarns are woven.
[0062] FIG. 1 is a schematic plan view showing an outline of
weaving when the selvage portion gripping device for the loom is
installed at a weft yarn nozzle side. "1" indicates a warp yarn,
"2" indicates an additional yarn, "3" indicates a reed, "4"
indicates a weft yarn nozzle, "5" indicates a weft yarn, "6"
indicates a weft yarn cutter, "7" indicates a selvage portion
gripping device for a loom, "8" indicates a fringe, and "9"
indicates an edge dent of the reed. It should be noted that, in the
weaving, a plurality of warp yarns further exists and the weft yarn
5 and the reed 3 are further extended at a right side in FIG. 1.
However, the illustration is omitted.
[0063] The weft yarn 5 supplied from the weft yarn nozzle 4 is
weft-inserted into the additional yarns 2 supplied from a device
which supplies the additional yarns (not shown) and into the warp
yarns 1 supplied from a device which supplies the warp yarns (not
shown). The weft yarn 5 weft-inserted into the warp yarns 1 is
beaten up by the reed 3 and the edge dent of the reed 9, and a
woven fabric 10 and a selvage portion 11 are formed. It should be
noted that a tip of the beaten weft yarn 5 is normally caught by
catch-cords (not shown) or the like, and weft yarn tension is
maintained for a predetermined time. After that, the tip of the
weft yarn 5 is cut between the woven fabric 10 and the catch-cords
with a cutter allocated at an opposite side of the weft yarn nozzle
(not shown), and the catch-cords are collected.
[0064] The selvage portion 11 where the additional yarns 2 and the
weft yarns 5 are woven is supplied to the selvage portion gripping
device for the loom 7 without being reed-beaten, and is moved
inside the selvage portion gripping device synchronously with
movements of the woven fabric 10 and the fringes 8. At this time,
the weft yarn 5 is cut with the weft yarn cutter 6 immediately
after the reed beating. However, the selvage portion 11 after the
weft yarn is cut is disposed inside the selvage portion gripping
device, and the woven condition is maintained. Accordingly,
occurrence of crimp of the weft yarn or occurrence of looseness of
the warp yarn can be prevented.
[0065] The selvage portion 11 after the weft yarn have been cut is
discharged from the selvage portion gripping device as it is, and
is moved together with the woven fabric 10. However, since the
selvage portion 11 is discharged from the selvage portion gripping
device for the loom, the woven condition of the additional yarns 2
and the fringes 8 is not maintained. The fringes 8 are gradually
separated from the additional yarns 2 and move. The additional
yarns 2 move independently. Further, the woven fabric 10 and the
fringes 8 move together. The additional yarns 2 are collected in
the same route as that of the catch-cords allocated at the opposite
side of the weft yarn nozzle through a guide (not shown) or by
another winding device. With this mechanism, the crimp of the weft
yarn after the weft yarn is cut and looseness of the warp yarn are
not generated, and occurrence of cloth fell retreat at the selvage
of the woven fabric or warp yarn looseness in the base cloth
selvage portion is effectively suppressed.
[0066] To make it difficult to generate the crimp of the weft yarn
and the looseness of the warp yarn, a length for gripping the
selvage portion (i.e., a length in a longitudinal direction of the
woven fabric where the selvage portion is held down by the means
that maintains the woven condition of the selvage portion of the
woven fabric, and hereinafter referred to as "selvage portion
gripping length") is preferably 2 to 15 mm, and more preferably 3
to 10 mm. By having this range, high tension can be maintained even
when the weft yarn is cut after the reed beating, and a woven
fabric structure can be stabilized.
[0067] It is preferable that a width to grip the selvage portion
(i.e., a length in a direction vertical to the longitudinal
direction of the woven fabric where the selvage portion gripping
device for the loom grips the selvage portion (a direction where
the additional yarns which form the selvage portion are arranged),
and hereinafter referred to as "selvage portion gripping width") be
a width capable of gripping the entire selvage portion. However,
the width is not limited to the above-described width as long as
the high tension can be maintained even when the weft yarn is cut
after the reed beating to stabilize the woven fabric structure.
[0068] The selvage portion gripping device for the loom is only
disposed at the weft yarn nozzle side of the woven fabric 10.
However, the device may be disposed at the opposite side of the
weft yarn nozzle. When the selvage portion gripping device for the
loom is disposed at the opposite side of the weft yarn nozzle, it
is preferable that the device be provided between the woven fabric
and the weft yarn cutter allocated at the opposite side of the weft
yarn nozzle. At that time, similarly to the weft yarn nozzle side,
it is preferable that the additional yarns be parallelized at the
opposite side of the weft yarn nozzle of the woven fabric, that the
selvage portion woven with the beaten weft yarns be formed, and
that the selvage portion gripping device for the loom be disposed
near a reed beating portion of the selvage portion. It is more
preferable that the selvage portion gripping device for the loom
allocated at the side of the weft yarn nozzle and the selvage
portion gripping device for the loom allocated at the opposite side
of the weft yarn nozzle be disposed opposite to each other via the
warp yarns of the woven fabric to maintain weft yarn tension.
[0069] FIG. 2 is an enlarged schematic perspective view of when the
selvage portion gripping device for the loom 7 is installed at the
weft yarn nozzle 4 side. "1" indicates the warp yarn, "2" indicates
the additional yarn, "4" indicates the weft yarn nozzle, "5"
indicates the weft yarn, "8" indicates the fringe, "10" indicates
the woven fabric, and "11" indicates the selvage portion. The woven
fabric 10 is forwarded from a right upper side in the drawing to a
left lower side in the drawing. Further, the plurality of warp
yarns further exists and the weft yarn 5 is further extended at a
right upper portion in the drawing. However, the illustration is
omitted.
[0070] It is desirable that the selvage portion gripping device for
the loom 7 be provided at least at the weft yarn nozzle side of the
woven fabric 10. In addition, it is preferable that the device 7 be
further provided at the opposite side of the weft yarn nozzle.
[0071] The selvage portion gripping device for the loom 7 includes
an outlet 71B of the selvage portion of a space where the selvage
portion can pass in which the selvage portion 11 formed by weaving
the additional yarns 2 and the weft yarns 5 can pass through in the
woven fabric forwarding direction and an inlet 71A (not shown) of
the selvage portion of the space where the selvage portion can pass
formed at upper reaches of the additional yarns 2 of the selvage
portion gripping device for the loom 7. An outlet 72B of the
selvage portion is a tiny space portion where the weft yarn can
move and which is at the woven fabric side for which the fringes 8
move parallel to the forwarding direction of the woven fabric 10. A
tiny space where the weft yarn can move and which is allocated at
the weft yarn nozzle side 72A (not shown) is formed at the weft
yarn nozzle side of the selvage portion gripping device for the
loom 7.
[0072] The selvage portion 11 enters the space portion where the
selvage portion can pass from the inlet 71A of the space where the
selvage portion can pass along the forwarding direction of the
woven fabric 10. The fringes 8 are gripped by a gripping means
provided between the tiny space where the weft yarn can move and
which is allocated at the weft yarn nozzle side 72A and the tiny
space where the selvage portion can move and which is allocated at
the woven fabric side 72B. The fringes 8 move inside the space
where the selvage portion can pass parallel to the forwarding
direction of the woven fabric 10. Even when the weft yarn 5 is cut
with the weft yarn cutter between the weft yarn nozzle 4 and the
selvage portion gripping device for the loom 7, the woven condition
of the selvage portion is maintained.
[0073] As the means to maintain the woven condition of the selvage
portion 11 within the selvage portion gripping device for the loom,
a sliding member which does not prevent movement of the selvage
portion in the space where the selvage portion can pass can be
cited. A method in which a dimension of the space where the selvage
portion can pass is appropriately set according to a dimension of
the selvage portion to be capable of gripping the selvage portion
11 can be employed. However, a method in which a flexible part
which catches a selvage portion which flexibly catches the selvage
portion is arranged in the space where selvage portion can pass of
the selvage portion gripping device for the loom is simpler and
more reliable.
[0074] In this case, the flexible part which catches the selvage
portion is provided inside the space where selvage portion can
pass. As the flexible part which catches the selvage portion, a
rubber plate or a resin plate can be used, or a member formed of a
flexible member such as a coil spring or a rubber, and a plate
material made of a metal or the like can be used. Further, it is
advantageous to use a fixed plate spring in the space where the
selvage portion can pass in terms of a structure and simplicity,
i.e., cost. Also, it is preferable that a portion of the flexible
part which catches the selvage portion which is in contact with the
selvage portion have a surface having a low abrasion property.
[0075] FIG. 3 is a schematic sectional view of the selvage portion
gripping device for the loom which uses a pair of plate springs
74A, 74B as the flexible part which catches the selvage portion.
FIG. 3 corresponds to a case where the device is taken along a
surface orthogonal to the weft yarns 5 in FIG. 2.
[0076] The woven fabric is forcibly taken off by a winding roll in
the weaving. Accordingly, in a condition where the additional yarns
2 and the weft yarns 5 are woven, the selvage portion 11 is moved
from a right side to a left side in the drawing, i.e., from the
inlet 71A of the space where the selvage portion can pass to the
outlet 71B of the space where the selvage portion can pass. "74A"
and "74B" indicate a pair of carbon steel catching parts such as
plate springs, provided inside the space portion where the selvage
portion can pass, and are respectively fixed to upper and lower
wall surfaces of the space portion where the selvage portion can
pass by two bolts 73. There, the selvage portion 11 provided in the
space portion where the selvage portion can pass is caught by the
plate springs 74A, 74B serving as the flexible selvage portion
parts from the upper and lower surfaces. Even when the weft yarn 5
is cut between the weft yarn nozzle 4 and the selvage portion
gripping device for the loom 7, the cut weft yarn 5 is prevented
from slipping out from the selvage portion 11 or from loosening,
and the woven condition of the selvage portion 11 is maintained
inside the selvage portion gripping device for the loom 7. The
selvage portion 11 is moved inside the space portion where the
selvage portion can pass and discharged from the selvage portion
gripping device for the loom 7. The woven fabric 10 is moved
together with the fringes 8. At this time, as described above, the
woven condition between the additional yarns 2 and the cut fringes
8 are loosened, the cut fringes 8 are gradually separated from the
additional yarns 2, and the additional yarns 2 move independently
and are separated from the woven fabric 10 and the fringes 8.
[0077] It is not always necessary that the flexible part which
catches the selvage portion is formed in a pair. One plate spring
disposed on the upper (or the lower) wall surface and a lower side
(or an upper side) thereof inside the selvage portion passage
section may be provided. The plate spring can employ various
shapes. However, to catch the selvage portion by uniform stress
over a constant length, as in FIG. 3, it is preferable to use the
pair of plate springs 74A, 74B which respectively has a planar
shape and two arc shapes at both ends thereof. By considering the
number of the additional yarns which configures the selvage portion
and a thickness of each additional yarn, a thickness of the selvage
portion, and the like, a length or a width of a portion having the
planar shape, a thickness of the plate spring, and the like may be
appropriately set. Accordingly, the woven condition of the selvage
portion can be maintained in a degree that the crimp of the weft
yarn after the weft yarn is cut or the looseness of the warp yarn
is not generated at the selvage portion discharged from the selvage
portion gripping device 7. Further, as the material, stainless
steel, phosphor bronze, beryllium copper, resin, or the like can be
employed as well as the carbon steel.
[0078] FIG. 4 is a schematic sectional view of the selvage portion
gripping device for the loom 7 shown in FIG. 3 which is taken along
a surface orthogonal to a forwarding direction of the additional
yarns 2. In this drawing, "72A" indicates the tiny space where the
weft yarn can move for the weft yarn at the weft yarn nozzle side
(before cutting and after cutting) to move together with the
selvage portion, and "72B" indicates the tiny space where the weft
yarn can move for the weft-inserted weft yarn 5 to move in the
forwarding direction of the woven fabric 10. These tiny space where
the weft yarn can move 72A, 72B can adjust a clearance so that the
weft yarn can pass through and a woven portion between the
additional yarns and the weft yarns in the woven condition (i.e.,
the selvage portion) cannot pass through. Accordingly, even when
the weft yarn is cut at the weft yarn nozzle side, the woven
condition is maintained, and there is no occurrence of a crimp of
the weft yarn caused by slipping-out or looseness of the cut weft
yarn or no occurrence of a loosen fringe caused by the looseness of
the warp yarn. Therefore, it is preferable that a height of the
tiny space where the weft yarn can move be smaller than heights of
the inlet and the outlet of the space portion where the selvage
portion can pass.
[0079] Typically, the woven fabric woven by using the selvage
portion gripping device for the loom is particularly useful when
weaving a high-density woven fabric used for sportswear, industrial
materials or the like. However, this disclosure is not limited to
this.
[0080] The yarn for the warp yarn or the weft yarn used for weaving
is not particularly limited, and a chemical fiber, a natural fiber
or the like can be used. As the chemical fiber, for example, a
polyamide-based fiber, a polyester-based fiber, an aramid-based
fiber, a rayon-based fiber, a polysulfone-based fiber, a super high
molecular weight polyethylene-based fiber or the like can be used.
As the natural fiber, cotton, hemp, silk, wool, or the like can be
used. In weaving the high-density woven fabric, the chemical fiber
is preferable. Among these, the polyamide-based fiber and the
polyester-based fiber which are excellent in mass productivity and
economy are preferable. The polyamide-based fiber is further
preferable from a viewpoint of heat resistance and less fluff of
the fiber.
[0081] As the polyamide-based fiber, for example, fibers made of
Nylon 6, Nylon 66, Nylon 12, Nylon 46, a copolymerized polyamide of
the Nylon 6 and the Nylon 66, copolymerized polyamides formed by
copolymerizing the Nylon 6 with polyalkylene glycol, dicarboxylic
acid, amine and the like can be cited. Further, as the
polyester-based fiber, for example, fibers made of polyethylene
terephthalate, polybutylene terephthalate, polytrimethylene
terephthalate and the like can be cited. A fiber formed by
copolymerizing the polyethylene terephthalate or the polybutylene
terephthalate with isophthalic acid, or 5-sodium sulfoisophthalic
acid as an aromatic dicarboxylic acid component, or a fiber formed
by copolymerizing the polyethylene terephthalate or the
polybutylene terephthalate with aliphatic dicarboxylic acid such as
adipic acid, may be used as well.
[0082] Further, to improve productivity in a spinning and
stretching process and a processing process or to improve
characteristics, these synthetic fibers may contain an additive
such as a heat stabilizer, an antioxidant, a light stabilizer, a
smoothing agent, an antistatic agent, a plasticizer, a thickener, a
pigment, a flame retardant and the like.
[0083] Further, as a form of the fiber, a multifilament yarn is
preferably used from a point of significantly achieving the desired
effects.
[0084] Further, a sectional shape of a single yarn is not limited
to a round shape and may be formed in any shape. For example,
needless to say, the sectional shape may be a laterally symmetrical
shape such as a flat shape, a rectangular shape, a rhomboid, or a
cocoon shape, or a laterally asymmetrical shape. Alternatively, the
sectional shape may be a shape combining any of these. Further, the
sectional shape may have a protrusion or unevenness. The yarn may
be a hollow yarn.
[0085] A plain weave, a twill weave, a satin weave, a variation of
these weaves, and the like can be used for the woven fabric
manufactured by using the selvage portion gripping device for the
loom. However, this disclosure is not particularly limited to these
weaves.
[0086] The woven fabric manufactured by using the selvage portion
gripping device for the loom is woven using the warp yarn, the weft
yarn, and the additional yarn as basic yarns. The additional yarn
catches the weft yarn by utilizing its rigidity and prevents
looseness of the weft yarn. The additional yarn forms the selvage
portion by weaving with the weft yarn.
[0087] A predetermined number of the warp yarns are parallelized,
and the additional yarns are further parallelized at the outside of
the parallelized warp yarns. The weft yarn is supplied and beaten
up, and the woven fabric is manufactured. As described above, after
the woven condition between the supplied weft yarns and the
additional yarns is maintained near the reed beating portion of the
selvage portion by the selvage portion gripping device for the
loom, the selvage portion is discharged from the selvage portion
gripping device for the loom of the woven fabric. In other words,
near the reed beating portion of the selvage portion, the selvage
portion gripped by the selvage portion gripping device for the loom
is moved synchronously with the movement of the woven fabric inside
the selvage portion gripping device for the loom, and discharged
thereafter.
[0088] The discharged selvage portion is moved together with the
movement of the woven fabric. As mentioned above, since the
additional yarns are gradually separated from the portion of the
selvage portion where the weft yarn is cut, the finished woven
fabric does not include the additional yarns. In other words, the
additional yarn is supplied from a supply device different from the
warp yarn. While the warp yarns are passed through healds and
reeds, the additional yarns are not passed through the reeds. The
additional yarns form the selvage portion together with the weft
yarns woven by opening movements similar to the warp yarns, and are
passed through the selvage portion gripping device for the loom.
The additional yarns are supplied from the vicinity of a warp yarn
beam, a load is applied to the additional yarns by a spring type
tensioner, and the additional yarns are passed through the opened
healds. After the weft yarn is run by high-pressure water or
pressured air and the warp yarn and the weft yarn are beaten up by
the reed, the weft yarn is cut with the weft yarn cutter. Since the
selvage portion gripping device for the loom grips the selvage
portion to maintain the woven condition of the selvage portion,
slipping-out of the cut weft yarn from the selvage portion or
looseness thereof is suppressed. With this configuration, compared
with a case where the selvage portion gripping device for the loom
is not installed, the crimp of the weft yarn of the selvage portion
becomes small, and the crimp of the warp yarn becomes large. Due to
this, warp yarn tension becomes high, gripping force for the weft
yarn increases, and the cloth fell retreat at the selvage portion
becomes small. Hence, since a cloth length difference between the
selvage portion and a central portion of the woven fabric becomes
small, an amount of a bow becomes small, and the warp yarn
looseness in the base cloth selvage portion can improve.
[0089] When weaving is performed according to the conventional
method, the cloth fell is expressed by a distance from a top of a
temple to the cloth fell. When the weft yarn is run by the
high-pressure water or the pressured air, high tension acts on the
weft yarn. When the weft yarn is cut with the cutter after the weft
yarn is beaten up by the reed, the free end portion of the weft
yarn returns to a ground side of the woven fabric. Due to the
decline in the weft yarn tension at the selvage portion of the
woven fabric, the crimp of the weft yarn increases, and conversely
the crimp of the warp yarn at the selvage portion decreases.
Accordingly, the warp yarn tension at the selvage portion becomes
low. As a result, the gripping force exerted on the weft yarn by
the warp yarns disappears, and the cloth fell retreat becomes
large. Also, the amount of a bow of the woven fabric increases,
which thereby leads to occurrence of the warp yarn looseness in the
base cloth selvage portion or deterioration of physical properties
of the woven fabric. However, by performing weaving by using the
selvage portion gripping device for the loom, the above-described
problems are solved.
[0090] When weaving is performed by using the selvage portion
gripping device for the loom, the additional yarns are normally
supplied from a cone or a paper tube without using a leno yarn
device or a bobbin. Particularly, it is preferable to use a spring
washer to manage the tension when the additional yarns are
supplied.
[0091] Since moderate crimping lessens fluctuations in tension of
the additional yarns during weaving, it is preferable that the
additional yarn be a multifilament and a crimped yarn. A material
of the additional yarn is not particularly limited. However,
polyester or nylon is easily available in general. It is preferable
to select the material of the additional yarn similar in yarn
characteristics to the warp yarn.
[0092] It is preferable that total fineness of the additional yarns
be larger than total fineness of the weft yarns. By keeping woven
strength between the additional yarns and the weft yarns at the
selvage portion larger than woven strength between the warp yarns
and the weft yarns, slipping-out of the cut weft yarn from the
selvage portion or loosening thereof is prevented.
[0093] From a viewpoint of exhibiting the desired effects to the
maximum, it is preferable that the number of additional yarns be
four to eight yarns.
[0094] Since the woven fabric using the selvage portion gripping
device for the loom can be subjected to high-speed operation, it is
preferable that the woven fabric be woven by a jet loom.
Particularly, a water jet loom is preferable from a point of
conspicuously exhibiting the desired effects. The water jet loom
runs the weft yarns by the high-pressure water, beats up the weft
yarns, and then cuts the weft yarns at the weft yarn nozzle side.
Because of this, compared to an air jet loom or a rapier loom, the
water jet loom tends to have high running tension of the weft
yarns, and further improvement of gripping force of the weft yarn
at the selvage portion is requested. Accordingly, at the time of
high-speed operation or a wide woven fabric in particular, the
effect obtained by use of the added yarns (additional yarns) and by
the selvage portion gripping device for the loom becomes more
conspicuous.
[0095] When the high-density woven fabric is woven by using the
selvage portion gripping device for the loom, it is preferable
that, after the weaving by the water jet loom, scouring/heat set
processing be performed to dry and/or remove an oil agent adhered
to original yarns and remove wrinkles.
[0096] A width of the woven fabric is not particularly limited.
However, since the warp yarn looseness in the base cloth selvage
portion easily occurs as the woven fabric is wider, the device is
particularly useful for the woven fabric having a region where only
the warp yarns exist of 140 cm or more, and particularly of 180 cm
or more. It is preferable that an upper limit of the width be 280
cm or less in manufacturing.
[0097] Next, a method of weaving using the selvage portion gripping
device for the loom will be described.
[0098] The above-described yarns are used for the warp yarns, the
additional yarns, and the weft yarns. The warp yarns and the
additional yarns whose fineness is in proportion to woven fabric
design are arranged for the warp and set in the loom. The weft
yarns are prepared in the same manner. The additional yarn to be
used is normally thicker than the warp yarn. As for the loom, it is
preferable to use the water jet loom from a point of reducing
occurrence of warp yarn fluff or improving productivity.
[0099] The tension of the warp yarn and the additional yarn is
preferably 10 to 250 cN/yarn, and more preferably 20 to 200
cN/yarn. By setting the tension in such a range, a tiny space
between single fibers in a yarn bundle of the yarns that configures
the woven fabric can be reduced, and a dense woven fabric can be
obtained. Further, after the weft yarn is inserted, the warp yarns
tensioned as described above force the weft yarn to bend so that
structure-restraining force of the woven fabric in the weft yarn
direction is enhanced, an anti-yarn slippage property of the woven
fabric improves, and a seam portion of a sewn product can be
strengthened. If the warp yarn tension is small, a contact area
between the warp yarns and the weft yarns in the woven fabric
cannot be increased, and edge comb resistance cannot be obtained to
a desirable extent. Further, an effect of reducing the tiny space
between the single fibers is small. If the warp yarn tension is
excessively great, the warp yarns tend to produce fluff due to
abrasion at heald mails.
[0100] As a concrete method of adjusting the warp yarn tension
within the above-described range, a method in which an inserting
speed of the weft yarn is adjusted besides adjusting a forwarding
speed of the warp yarn of the loom can be cited. Whether the warp
yarn tension is actually within the above-described range during
weaving can be checked by, for example, measuring the tension that
acts per warp yarn at an intermediate point between the warp yarn
beam and a back roller during operation of the loom. Further, it is
preferable to provide a difference between tension of an upper
sheet of the warp yarn and tension of a lower sheet of the warp
yarn at the warp yarn opening.
[0101] As an adjustment method, there is, for example, a method in
which a difference in a running line length between the upper yarns
and the lower yarns is provided by installing a back roller level
to, for example, about 10 to 30 mm higher than a horizontal
position and the like. Further, as another method of providing a
difference between the tension of the upper yarns and the tension
of the lower yarns, there is, for example, a method in which a cam
drive system is adopted in an opening device, and a dwell angle for
the other side of the upper yarns/the lower yarns is made 100
degrees greater than that of the other. The tension of the warp
yarn with the increased dwell angle is higher.
[0102] Next, if necessary, processing such as scouring, heat set,
or the like is performed after the weaving process.
[0103] In the woven fabric woven by using the selvage portion
gripping device for the loom, occurrence of cloth fell retreat at
the selvage portion or occurrence of the warp yarn looseness in the
base cloth selvage portion can be effectively prevented even in the
high-speed weaving. For example, even when the loom is operated at
high-speed rotation of about 400 to 900 rpm, occurrence of the warp
yarn looseness in the base cloth selvage portion is extremely
suppressed. Accordingly, the woven fabric can be cut into a shape
as designed and also easy to sew. Further, since occurrence of the
warp yarn looseness in the base cloth selvage portion is
suppressed, waste of the woven fabric is small, and the woven
fabric is advantageous in terms of cost.
Example
[0104] Hereinafter, a configuration and a desired effect will be
described in detail by using the following examples.
Measurement Method
(1) Total Fineness
[0105] Total fineness was obtained by measuring fineness based on
corrected mass with a predetermined load of 0.045 cN/dtex according
to a JIS L 1013:2010 8.3.1 A method.
(2) Number of Single Fibers
[0106] Calculation was performed according to a method of JIS L
1013:2010 8.4.
(3) Fineness of Single Fiber
[0107] Calculation was performed by dividing the total fineness by
the number of single fibers.
(4) Weaving Density of Warp Yarns/Weft Yarns
[0108] Measurement was performed based on JIS L 1096:2010 8.6.1.
Each sample was placed on a flat table, and unnatural wrinkles and
tension were removed. Then, at five different locations, the
numbers of warp yarns and weft yarns in sections of 2.54 cm were
counted, and average values for the warp yarn and the weft yarn
were calculated.
(5) Strength/Elongation
[0109] Measurement was performed under a constant speed elongation
condition shown in a JIS L 1013:2010 8.5.1 standard time test.
Using "TENSILON" UCT-100 made by ORIENTEC Co., LTD, each sample was
performed at a grip interval of 25 cm and a pulling speed of 30
cm/min. Elongation was obtained from elongation of a point showing
the ultimate strength in an S-S curve.
(6) Warp Yarn Tension During Weaving
[0110] Using a "Check Master" (registered trademark) (type:
CM-200FR) made by Kanai Kouki K.K., tension acting per warp yarn in
an intermediate portion between the warp yarn beam and the back
roller during operation of the loom was measured.
(7) Evaluation of Warp Yarn Looseness in Base Cloth Selvage
Portion
[0111] As shown in FIG. 5, two marks (102A, 102B) are put on a
central portion in a width direction of the woven fabric 10 at an
interval of 500 mm. Two lines (103A, 103B) are drawn along the weft
yarns from the marks 102A, 102B at the respective central portions
of the woven fabric in a direction of an end portion 101A at the
weft yarn nozzle side of the woven fabric and in a direction of an
end portion 102B at the opposite side of the weft yarn nozzle of
the woven fabric. The end portions 101A, 102B are width direction
both ends. In this case, the woven condition of the woven fabric 10
tends to be loose at both the sides as compared with the central
portion. Accordingly, as shown in FIG. 5, the two lines bend toward
the cloth fell on both the sides, and an interval between the two
lines, i.e., the lines 103A, 103B in the direction of the weft
yarn, tends to be wider at peripheral portions than the central
portion. Therefore, while a distance between the two lines 103A,
103B in the weft yarn direction at the central portion of the woven
fabric is 500 mm, when the warp yarn looseness in the base cloth
selvage portion becomes large, an interval between the two lines
103A and 103B in the direction of the weft yarn becomes wider at
the end portion 101A allocated at the weft yarn nozzle side of the
woven fabric and the end portion 101B allocated at a side which is
not the weft yarn nozzle side of the woven fabric. The end portions
101A, 101B are the both sides.
[0112] Next, lines, i.e., lines 104A, 104B in the warp yarn
direction, are drawn between the two lines 103A, 103B in the
direction of the weft yarn at an interval of 20 mm from the end
portion 101A allocated at the weft yarn nozzle side of the woven
fabric and from the end portion 101B allocated at the opposite side
of the weft yarn nozzle of the woven fabric. The end portions are
the both sides of the woven fabric. The woven fabric is cut along
the lines 103A, 103B in the direction of the weft yarn and the
lines 104A, 104B in the direction of the warp yarn, thereby
obtaining two strip-shaped bodies generated at the end portions of
the woven fabric and having shapes close to rectangles. Lengths in
the warp direction, (i.e., a length direction) of the strip-shaped
bodies were measured, and the warp yarn looseness in the base cloth
selvage portion was evaluated.
Example
Warp Yarns/Weft Yarns
[0113] Multifilament yarns formed of polyester and having a
circular sectional shape, with single fiber fineness of 2.33 dtex,
the number of filaments being 36, total fineness of 84 dtex, no
twist provided, strength of 4.21 cN/dtex, and elongation of 40%
were prepared.
Weaving
[0114] Employing the above-described yarns for warp yarns and weft
yarns and by a water jet loom equipped with a selvage portion
gripping device for a loom, which will be described below, a plain
weave fabric was woven with warp yarn tension during weaving being
20 cN/yarn, loom rotation speed being 500 rpm, warp yarn density
being 133 yarns/2.54 cm, weft yarn density being 133 yarns/2.54 cm,
and a width (a width of a portion where the warp yarns exist) being
200 cm.
[0115] As for additional yarns, 3 ply textured yarns formed of
polyester and having a circular sectional shape, with single fiber
fineness of 3.44 dtex, the number of filaments being 96 f, and
total fineness of 330 dtex were used. Four additional yarns were
supplied and parallelized to each of the two outsides of the warp
yarns where a predetermined number of yarns were parallelized, and
supplied by setting additional yarn tension to 130 cN/yarn. A
clearance of 5 mm was provided between the warp yarn and the
additional yarn as a fringe. The fringes of the discharged selvage
portion were gradually separated from the additional yarns, and the
additional yarns were collected in the same route as the
catch-cords at the opposite side of the weft yarn nozzle through a
guide.
Selvage Portion Gripping Device for Loom
[0116] The selvage portion gripping device for the loom in FIG. 3
includes the space portion where the selvage portion can pass in
which the selvage portion formed by weaving the additional yarns
and the weft yarns can pass through in the woven fabric forwarding
direction and the tiny space portion where the weft yarn can move
in which the weft yarn can move in the woven fabric forwarding
direction, and further includes a pair of plate springs arranged at
the space portion where the selvage portion can pass. The two
selvage portion gripping devices for the loom were respectively
installed at the end allocated at the weft yarn nozzle side and at
the end allocated at the opposite side of the weft yarn nozzle near
the reed beating portion of the loom.
[0117] A main body of the selvage portion gripping device for the
loom 7 is made of stainless steel and has a rectangular
parallelepiped shape (6 mm in width, 30 mm in height, 25 mm in
length). As shown in FIG. 3, the selvage portion gripping device
for the loom 7 includes the inlet 71A of the space where the
selvage portion can pass which has a width of 4 mm and a height of
10 mm and the outlet 72A of the space where the selvage portion can
pass. Also, the two flexible parts which catch the selvage portion
are vertically provided in the space where the selvage portion can
pass. The two flexible parts that catch the selvage portion are
respectively configured by the plate springs 74A, 74B and plate
spring supporting bodies 75A, 75B. The plate springs 74A, 74B are
respectively made of stainless steel having a thickness of 0.3 mm,
have the arc-shaped portions at both ends of the flat plate portion
having a length of 20 mm, and are fixed to the plate spring
supporting bodies 75A, 75B by bolts. As a result, a selvage portion
gripping length was set to 20 mm, and a selvage portion gripping
width was set to 4 mm. The selvage portion was configured to be
caught so that the selvage portion passes between the flat plate
portions of the pair of plate springs synchronizing with a flow of
the woven fabric. Further, as shown in FIG. 4, the tiny space where
the weft yarn can move and which is allocated at the weft yarn
nozzle side 72A and the tiny space portion where the selvage
portion can move and which is allocated at the woven fabric side
72B are formed on both the side surfaces of the selvage portion
gripping device for the loom 7. A widths of these tiny spaces are
formed slightly larger than a diameter of the weft yarn and smaller
than a thickness of the selvage portion where the weft yarns and
the additional yarns are woven. As a result, the weft yarn moves
parallel along the flow of the woven fabric, and the selvage
portion is not slipped out from the tiny space where the weft yarn
can move to the woven fabric side even after the weft yarn is cut
with the weft yarn cutter.
Comparative Example
[0118] Except that the selvage portion gripping device for the loom
and the additional yarns are not used, the weaving was performed
according to a method similar to the method in Example.
Evaluation of Warp Yarn Looseness in Base Cloth Selvage Portion
[0119] Hereinafter, the woven fabrics obtained in the Example and
Comparative Example were evaluated according to the above-described
evaluation method of the warp yarn looseness in the base cloth
selvage portion. Lengths of the strip-shaped bodies are shown. As
is evident from this, occurrence of cloth fell retreat at the
selvage portion of the woven fabric and the warp yarn looseness in
the base cloth selvage portion were decreased in the woven fabric
woven by using the selvage portion gripping device for the
loom.
Warp Yarn Looseness at Base Cloth Selvage Portion in Example
[0120] L side: 510.5 mm
[0121] R side: 512.5 mm
Warp Yarn Looseness at Base Cloth Selvage Portion in Comparative
Example
[0122] L side: 518.0 mm
[0123] R side: 520.0 mm
* * * * *