Textiles: weaving – Special-type looms – Irregular warp feed
Reexamination Certificate
2000-06-27
2001-05-15
Falik, Andy (Department: 3741)
Textiles: weaving
Special-type looms
Irregular warp feed
Reexamination Certificate
active
06230754
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for applying tension to ground warp yams in a cloth movable type pile loom by the displacement of a ground warp tension roller.
2. Prior Art
A cloth movable type pile loom is provided with a terry motion mechanism. The terry motion mechanism moves a ground warp tension roller in the same direction as a woven cloth so as to move a cloth fell of a woven cloth back and forth. Accordingly, the terry motion mechanism is associated with a supporting mechanism of a ground warp tension roller to move the ground warp tension roller back and forth. The ground warp tension roller is naturally biased in the direction to apply tension to the ground warp yarns.
FIG. 1
shows a schematic view of a ground warp let-off tension device
1
of a conventional typical cloth movable type pile loom as disclosed in Japanese Patent Laid-Open Publication No. 9-111597. In
FIG. 1
, ground warp yarns
2
are unwound from a ground warp let-off beam
3
, and they contact a ground warp tension roller
4
, then they form a shedding
8
by a vertical movement of heddles
5
, and finally they reach a cloth fell
7
of a woven cloth
6
. Meanwhile, pile warp yarns
9
are unwound from a pile warp let-off beam
10
and contact a pile warp tension roller
11
, then they reach the cloth fell
7
of the woven cloth
6
. A weft yarn
12
inserted in the position of the shedding
8
is beaten up against the cloth fell
7
by a reed
13
to form the woven cloth
6
, then the woven cloth
6
passes through a cloth moving roller
14
and is wound around a cloth winding roller
15
.
Since both the cloth moving roller
14
and ground warp tension roller
4
move the woven cloth
6
and ground warp yarns
2
back and forth, they are supported by the terry motion mechanism
16
and a mechanism interlocked therewith. In this example, the terry motion mechanism
16
comprises brackets
18
,
19
respectively attached to the right and left frames
17
, L-shaped terry motion levers
20
,
21
respectively rotatably supported by shafts
23
,
24
relative to the brackets
18
,
19
, and links
22
, and shafts
25
,
26
for connecting the end portions of the terry motion levers
20
,
21
.
The terry motion levers
20
are biased clockwise by extension springs
27
, and they are supported by a cam
28
and a cam roller
30
that contacts the outer periphery of a cam
28
so as to swing back and forth in synchronization with the rotation of a main shaft
32
of the loom. Meanwhile, the cam
28
is integrated with a camshaft
29
and is driven while interlocked with the rotation of the main shaft
32
of the loom. The cam roller
30
is rotatably supported by the roller shaft
31
of the terry motion levers
20
.
The swingable motion of the terry motion levers
20
is transmitted to each one end of a pair of right and left swing levers
36
by way of a shaft
34
, interlocking links
33
and a shaft
35
. The swing levers
36
are swingably supported by a bracket
37
and a shaft
38
respectively fixed to the frames
17
, and they swingably support a pair of right and left levers
41
by an intermediate shaft
39
.
The pair of right and left levers
41
are connected to and integrated with each other by a roller shaft
40
serving as a shaft fully extending to the right and left thereof (hereinafter referred to as simply the through shaft) whereby the ground warp tension roller
4
is rotatably supported by the levers
41
at respective first ends while they are biased by an extension spring
42
in the direction to apply tension to the ground warp yarns
2
by way of the ground warp tension roller
4
at respective second ends. When the pair of right and left levers
41
are connected to and integrated with each other, a biasing force of the extension spring
42
acts on the right and left sides of the ground warp tension roller
4
uniformly to the right and left so as to apply a uniform tension to the ground warp yarns
2
.
During the weaving operation, the cam
28
is synchronized with the rotation of the main shaft
32
to swing the terry motion levers
20
back and forth. Accordingly, respective terry motion levers
20
move the cloth moving roller
14
back and forth by way of respective links
22
and levers
21
while they move the ground warp tension roller
4
back and forth by way of the respective interlocking links
33
and swing levers
36
. As a result, when the ground warp yarns
2
and woven cloth
6
are moved back and forth, the cloth fell
7
is set to a first pick position and a loose pick position corresponding to the weaving texture.
Meanwhile, as looms have lately been operating at higher speeds and becoming large in width, the looms are required to increase in rigidity, so that respective components of the loom become heavy, Accordingly, a load applied to the terry motion mechanism
16
increases so that a breakage in the terry motion
16
mechanism occurs. Further, since the extension spring
42
is repeatedly moved back and forth when the device is moved back and forth, a desired elasticity is not obtained due to the fatigue of the extension spring
42
so that the extension spring
42
has become broken at an early stage. Since the roller shaft
40
of the ground warp tension roller
4
is a through shaft for connecting and integrating the pair of right and left levers
41
with each other, it is heavy so that inertia of the ground warp tension roller
4
becomes large. Accordingly, it is difficult for the ground warp tension roller
4
to move quickly to follow the change of tension of the ground warp yarns
2
so that the tension is kept constant.
SUMMARY OF THE INVENTION
It is an object of the invention to reduce a load to be applied to a terry motion mechanism when a ground warp tension roller is moved in a cloth movable type pile loom, and to prevent parts associated with the application of tension to the ground warp yarns from being broken in advance, and to enhance the response of the ground warp tension roller
4
that follows the change of tension of the ground warp yarns.
To achieve the above object, the cloth movable type pile loom capable of moving a ground warp tension roller back and forth via a terry motion mechanism
16
comprises a pair of first right and left swing levers
43
rotatably supporting the ground warp tension roller
4
, at least one of the first right and left swing levers
43
are connected to the terry motion mechanism
16
, pair of second right and left swing levers
45
are respectively swingably supported by right and left frames
17
and rotatably connected to the first right and left swing levers
43
. A tension application mechanism
48
applies a biasing force to the second right and left swing levers
45
in the turning direction thereof to press ground warp yarns
2
by way of the ground warp tension roller
4
.
The second right and left swing levers
45
are connected to and integrated with each other by a connection and integration member, and the second right and left swing levers
45
are swingably supported by the right and left frames
17
by way of a fulcrum shaft
46
which constitutes the connection and integration member.
The tension application mechanism
48
can be formed of an extension spring
49
for passively applying the biasing force to the second swing levers
45
in the turning direction thereof by elasticity of the extension spring
49
. The tension application mechanism
48
can also comprise motion conversion mechanisms (
53
,
54
,
55
,
56
,
57
), are synchronized with the rotation of a main shaft
32
of the loom to positively apply a reciprocation motion to the second swing levers
45
.
According to the invention, the second swing levers swingably support the first swing levers which are driven by the terry motion mechanism, however, the second swing levers, the second shaft serving as the fulcrum shaft of the second swing levers, and the first shaft for connecting between the first and second swing levers are not driven by the terry motion mecha
Falik Andy
Tsudakoma Kogyo Kabushiki Kaisha
Wenderoth , Lind & Ponack, L.L.P.
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