Textiles: weaving – Weft manipulation – Shuttle motions
Reexamination Certificate
2001-01-24
2001-08-07
Falik, Andy (Department: 3765)
Textiles: weaving
Weft manipulation
Shuttle motions
C139S192000
Reexamination Certificate
active
06269842
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a weaving loom, more particular to a weaving loom, which is provided with a circulating magnetic shuttle that circulates along an endless loop.
2. Description of the Related Art
In a conventional weaving loom, a reciprocating shuttle reciprocates along a straight race rail. When in a picking motion, the flying speed of the reciprocating shuttle is accelerated from 0 to a high constant speed, and is then braked and decelerated to 0. Subsequently, the same picking motion is repeated in the opposite direction, thereby increasing largely the weft picking time.
To overcome the time-consuming problem, the applicant heretofore proposed an improved weaving loom, which is provided with a circulating magnetic shuttle. Referring to
FIG. 1
, the improved weaving loom
1
is shown to include a driving wheel
111
that drives a driving belt
113
to circulate. A series of magnets
114
is secured to the belt
113
for attracting and driving a magnetic shuttle
13
to circulate along an endless loop. The shuttle
13
picks a weft with the assistance of a weft swinging rod
16
, and then moves the weft over a reed assembly
20
, which is held on a swing arm
221
that is fixed on a rotating shaft
222
. When the rotating shaft
222
rotates, the reed assembly
20
beats the weft
16
. Two series of guiding rollers
12
are disposed respectively around a driving wheel
111
and a driven wheel
112
so that, when moving along two curved portions of a race rail
101
, the shuttle
13
does not take off and deviate from the race rail
101
because of the centrifugal force that is generated. The conventional weaving loom
1
suffers from the following disadvantages:
1. The structure of the weaving loom
1
is relatively complicated. For example, a relatively long race rail
101
is needed to be disposed around the driving belt
113
, thereby serving as a passage of the shuttle
13
. In addition, a large number of guiding rollers
12
are disposed around the driving wheel
111
and the driven wheel
112
so as to guide the shuttle
13
to move along a curved path, thereby preventing the deviation of the shuttle
13
from an endless loop. As a result, it is difficult to manufacture the weaving loom
1
, thereby increasing the manufacturing costs.
2. The shuttle
13
cannot move smoothly on the race rail
101
. Ideally, the portion of the belt
113
between the driving wheel
111
and the driven wheel
112
should be in a horizontal position. However, during the movement of the magnets
114
between the driving wheel
111
and the driven wheel
112
, the portion of the belt
113
, to which the magnets
114
are attached, is slightly lower than the remaining portion of the belt
113
, which is located between the driving wheel
111
and the driven wheel
112
due to the weight of the magnets
114
. The larger the distance between the wheels
111
,
112
, the more serious the deviation of the magnets
114
from their predetermined circulating path. It is unavoidable, when weaving wider fabrics, to increase the distance between the wheels
111
,
112
. As a result, the belt
113
and magnets
114
cannot circulate smoothly at a high speed. Furthermore, because the shuttle
13
moves on the race rail
101
, and contacts frequently the guiding rollers
12
, it cannot fly smoothly along the endless loop, thereby reducing the weaving efficiency.
3. It is difficult to maintain and repair the weaving loom
1
. To descend the gravity center of the weaving loom
1
and reduce the vibration of the same, the race rail
101
and the guiding rollers
12
are disposed on a lower portion of the weaving loom
1
along with the swinging arm
221
and the rotating shaft
222
. Because they are disposed relatively close to each other, it is difficult to maintain and repair the weaving loom
1
.
SUMMARY OF THE INVENTION
The object of this invention is to provide an improved weaving loom, which is provided with a circulating magnetic shuttle and which has a simple structure that can be easily maintained and repaired and that can be operated smoothly, thereby increasing the weaving efficiency.
According to this invention, a weaving loom includes a transmission. The transmission includes a driving wheel, a driven wheel, an endless driving belt that extends around the driving wheel and the driven wheel, and at least one magnet unit, which is secured to an inside surface of the belt for attracting and driving a shuttle to circulate on a machine frame inside the belt.
REFERENCES:
patent: 4762153 (1988-08-01), Chuang et al.
patent: 2211491 (1972-03-01), None
patent: 1074646 (1999-07-01), None
patent: 2128661 (1972-10-01), None
Cheng Cheng-Hsiung
Falik Andy
Ladas & Parry
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