Textiles: spinning – twisting – and twining – Apparatus and processes – Piecing up
Reexamination Certificate
2001-10-15
2002-09-24
Worrell, Danny (Department: 3765)
Textiles: spinning, twisting, and twining
Apparatus and processes
Piecing up
Reexamination Certificate
active
06453656
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a piecing method and a piecing device for piecing a severed spun yarn on the winding package side and the sliver of a spinning machine for drafting a sliver and then winding to a winding package after spinning by a twisting device of such as a pneumatic type.
BACKGROUND OF THE INVENTION
First, the structure of the relevant part of the spinning machine will be described with reference to FIG.
8
.
Referring to
FIG. 8
,
10
is a draft device, and a back roller
11
, a third roller
12
, a middle roller
13
laid across an apron belt
14
, and a front roller
15
are formed in this order from the upstream side. A sliver S from a first sliver guide
16
on the upstream side of the back roller
11
is drafted in a designated drafting ration between each roller and is supplied to a twisting device
17
. A second sliver guide
16
a
is provided between the third roller
12
and the middle roller
13
.
The twisting device
17
comprises a guide hole (fiber introducing hole)
20
for guiding a fiber bundle F drafted in the draft device
10
to a guide member
18
located opposing to the tip of a hollow guide shaft member
25
to be mentioned later on, a spinning nozzle
22
with a nozzle hole
21
for generating whirling air flow in the tip (spinning point) of the hollow guide shaft member
25
to be mentioned later on, a nozzle block
24
for holding the spinning nozzle
22
and forming an air room
23
, the hollow guide shaft member
25
wherein the tip is provided facing the spinning nozzle
22
, and a holding member
26
for closing the air room
23
by joining to the nozzle block
24
, and which holds on the hollow guide shaft member
25
, and separates the hollow guide shaft member
25
with respect to the spinning nozzle
22
during a yarn breakage.
The fiber bundle F drafted by the draft device
10
is guided along the guide member
18
from the guide hole
20
, and then enters inside the hollow guide shaft member
25
. The end of the fiber, the tip of which is released from the nip at the front roller
15
at the time being, is whirled by the whirling flow injected from the nozzle hole
21
, is wound by reversing on the tip section of the hollow guide shaft member
25
, and is sucked in while winding onto the fiber entering the hollow guide shaft member
25
, to be a spun yarn Y like a true twist of which the most part of the fiber is to be a wrapping fiber. Moreover, the spun yarn Y is wound to the winding package (not shown in the drawings) by passing between a delivery roller
28
and a nip roller
29
contacting with the delivery roller
28
which compose the yarn feeding device on the downstream side of the twisting device
17
.
Between the draft device
10
and the twisting device
17
, an air shower tube
32
for blowing pressurized air to the sliver S during piecing, and a suction pipe
34
for holding the spun yarn at the winding package side and sucking the fiber blown off by the pressurized air from the air shower tube
32
, are provided.
Next, the conventional piecing operation after the yarn breakage will be described in reference to FIG.
9
through FIG.
10
.
When yarn breakage occurs, the back roller
11
and the third roller
12
which are a part of the draft rollers composing the draft device
10
are stopped, and the middle roller
13
and the front roller
15
, which are on the downstream side are maintained in a driving state. At that time, the yarn feeding by the delivery roller
28
and the nip roller
29
is also maintained at a driving state for a while. As a result, as shown in
FIG. 9
, the sliver S is broken by the driving middle roller
13
, and the sliver S stops with the tip section Sa positioned between the third roller
12
and the middle roller
13
. At this time, the tip section Sa of the sliver S is held by the second sliver guide
16
a.
Following the stopping of a part of the draft rollers of the draft device
10
, the driving (compressed air injection from the nozzle hole
21
) of the twisting device
17
is stopped while the hollow guide shaft member
25
is transferred to a state in which it is separated from the nozzle block
24
. Under such condition, preceding the piecing operation, the nip roller
29
is separated from the delivery roller
28
and the yarn feeding is stopped. Subsequently, the spun yarn Y at the winding package side is held by a yarn feeding roller
30
which comprises the yarn delivering member, and is fed back to the yarn discharging side of the twisting device
17
by being passed through the nip roller
29
and the delivery roller
28
. Then, by the rotation of the yarn feeding roller
30
, the spun yarn Y is fed toward the draft device
10
, and in cooperation with the air flow (not shown in the drawings) toward the fiber bundle inlet of the guide hole
20
, as a leading yarn Y (parent yarn), is passed through, in the opposite direction of the spinning direction inside the hollow guide shaft member
25
.
Furthermore, by rotating the yarn feeding roller
30
, the yarn tip of the leading yarn Y, projects from the guide hole
20
of the spinning nozzle
22
in cooperation with the air flow toward the fiber bundle inlet mentioned above, and the yarn tip of the leading yarn Y is held by being sucked by the suction pipe
34
provided between the spinning nozzle
22
and the front roller
15
. Then, as shown in
FIG. 10
, the holding member
26
is joined with the nozzle block
24
again.
Then, the draft rollers (back roller
11
and third roller
12
), which were stopped, are redriven, the sliver S is passed through the middle roller
13
and the front roller
15
and is delivered to the downstream side. At that time, the tip section of the sliver S is blown off by the pressurized air from the air shower tube
32
and is sucked and eliminated by the suction pipe
34
so that the guide hole
20
of the spinning nozzle
22
is not blocked.
Under the state in which the leading yarn (spun yarn) Y is held as in the manner stated above, the yarn feeding roller
30
is released from the yarn path, and starts running in the winding direction of the leading yarn Y by the nip roller
29
and the delivery roller
28
. After redriving the injection of the whirling air flow from the nozzle hole
21
, by stopping the injection of the pressurized air from the air shower tube
32
, the fiber composing the sliver S is wound around the outer periphery of the leading yarn Y, the piecing is carried out and the spinning is recommenced.
However, there were problems in the piecing method and the piecing device of aforementioned conventional spinning machine as to be described in the following.
That is, since the distance between the air shower tube
32
and the sliver S is long, and the pressurized air hits the front roller
15
of the draft device
10
, it was inefficient and there were cases in which the joint is bunched up together without the fiber, of which the fiber length is long and unlikely to be blown off to be eliminated completely.
Moreover, after stopping the injection of the pressurized air from the air shower tube
32
, since the fiber amount of the sliver S, which is to enter the guide hole
20
of the spinning nozzle
22
for piecing, is the normal fiber amount; in other words, a fiber amount that is the same as the leading yarn Y, the joint thickness will be theoretically 2 times that of the leading yarn Y in cross section, and in diameter, 1.4 times.
These were the yarn defects, and there was a problem in that the quality of the spun yarn as a product decreases.
The object of the present invention is to solve the problems mentioned above, and to provide a piecing method and a piecing device of a spinning machine capable of blowing off the sliver effectively during piecing and controlling the joint thickness.
SUMMARY OF THE INVENTION
The present invention to achieve the object mentioned above, relates to a piecing method for blowing pressurized air to a sliver and sucking and guiding by a suction pipe provided between a twisting device and a draft device to carry
Armstrong Westerman & Hattori, LLP
Murata Kikai Kabushiki Kaisha
Worrell Danny
LandOfFree
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