[Technical Field]
[0001] The present invention mainly relates to a method for
carrying out a yarn discharge spinning in a spinning machine not
including a delivery roller.
[Background Art]
[0002] A pneumatic spinning device that carries out a yarn
discharge spinning is conventionally known, The yarn di.srharge
spinning is a process of producing a yarn by carrying out a spinning
different from a normal spinning at start of the spinning. In the
pneumatic spinning device that carries out the yarn discharge
spinning, a nozzle (first nozzle) is arranged in a nozzle member,
and a nozzle (second nozzle) is also arranged in a hollow guide
shaft body. At the start of the spinning, the pneumatic spinning
device applies twists, to a fiber bundle drafted by a draft device,
by whirling airflow from the first nozzle, and further applies
twists while pulling the fiber bundle downstream by whirling airflow
from the second nozzle. Patent Documents 1 and 2 disclose spinning
machines that carry out this type of yarn discharge spinning.
[0003] In the spinning machines of Patent Documents 1 and 2,
a delivery roller, a nip roller, and a slack tube are arranged
downstream of the pneumatic spinning device. The delivery roller
and the nip roller are arranged facing one another to sandwich and
pull out the yarn produced by the pneumatic spinning device. The
slack tube is arranged downstream of the delivery roller and the
nip roller, and the slack tube sucks and temporarily accumulates
the yarn produced by the yarn discharge spinning.
[0004] Patent Document 1 discloses that the whirling airflow
from an auxiliary nozzle (second nozzle) of the hollow guide shaft
body is stopped after the yarn produced by the yarn discharge
spinning is sandwiched by the delivery roller and the nip roller.
[Prior Art Document]
[Patent Document]
t o n n e i u i T . 1 3 - Q 7 - 2 G 1 5 17 ' i 3
[0005]
[Patent Document 1] Japanese Unexamined Patent Publication No.
2001-146646
[Patent Document 2] Japanese Unexamined Patent Publication No.
2003-278035
[Summary of the Invention]
[Problems to be Solved by the Invention]
[0006] When pulling out the yarn from the pneumatic spinning
device by the delivery roller and the nip roller, the yarn sometimes
slips with respect to the delivery roller due to lack of a
sandwiching force. As a spinning machine that takes the above slip
into consideration, there is known a spinning machine (delivery
roller-less spinning machine) in which the delivery roller is
omitted and a yarn accumulating device is arranged downstream of
the pneumatic spinning device.
[0007] When carrying out the yarn discharge spinning in the
delivery roller-less spinning machine, the yarn produced by the
pneumatic spinning device may not be stably pulled out, and fibers
may get clogged in the pneumatic spinning device.
[0008] In Patent Documents 1 and 2, the spinning machine is
assumed to include the delivery roller, and description on the
delivery roller-less spinning machine is not made.
[0009] A main object of the present invention is to provide
a structure that prevents fibers from getting clogged in a pneumatic
spinning device during a yarn discharge spinning in a delivery
roller-less spinning machine.
[Means for Solving the Problems and Effects]
[0010] According to a first aspect of the present invention,
a spinning machine includes a pneumatic spinning device and a yarn
accumulating device. The pneumatic spinning device includes a
nozzle block and a hollow guide shaft body, the nozzle block
including a first nozzle adapted to generate whirling airflow in
a spinning chamber, and the hollow guide shaft body arranged
downstream of the nozzle block in a fiber travelling direction and
IPO DELHI 15-Q7-2015 I?"S3
including a second nozzle adapted to generate whirling airflow for
sucking a fiber bundle whirled in the spinning chamber. The yarn
accumulating device accumulates the yarn produced by the pneumatic
spinning device while pulling the yarn from the pneumatic spinning
device. The whirling airflow is generated from the first nozzle
and the second nozzle at least, at an instance when the yarn starts
being wound around the yarn accumulating device during a yarn
discharge spinning.
[0011] As the whirling airflow is continuously generated from
the second nozzle until the yarn is wound around the yarn
accumulating device, the pulling-out and assistance of twist arc
carried out by the whirling airflow from the second nozzle, whereby
the clogging of the fibers in the pneumatic spinning device can
be prevented.
[0012] In the spinning machine described above, after the yarn
is wound around the yarn accumulating device, generation of the
whirling airflow from the second nozzle is stopped while generation
of the whirling airflow from the first nozzle is continued.
[0013] After the yarn is wound around the yarn accumulating
device, the yarn is stably pulled out by the yarn accumulating device,
whereby the whirling airflow from the second nozzle is not necessary.
Thus, a structure excelling in energy saving property can be
realized by stopping the generation of the whirling airflow from
the second nozzle.
[0014] In the spinning machine described above, from start of
the yarn discharge spinning until the yarn is wound around the yarn
accumulating device, a condition of at least one of a spinning speed,
a draft ratio, and a yarn count is fixed.
[0015] If the above condition is changed before the yarn is
stably pulled out by the yarn accumulating device, an amount of
fiber bundle to be processed by the pneumatic spinning device
changes. Thus, yarn breakage or the clogging of the fibers in the
pneumatic spinning device may occur. The above condition is fixed
until the yarn is wound around the yarn accumulating device, so
pn DELHI 13-Q7-2Q15 17 §3
that the yarn breakage, the clogging of the fibers, or the like
can be prevented.
[0016] In the spinning machine described above, after the yarn
is wound around the yarn accumulating device, the condition of at
least one of the spinning speed, the draft ratio, and the yarn count
is changed.
[0017] After the yarn is stably pulled out by the yarn
accumulating device, the clogging of the fibers, and the like do
not occur even if the above condition is changed. Therefore, the
yarn may be produced by changing the condition to the condition
complying with demand.
[0018] The spinning machine described above further includes
a guide member adapted to bring the yarn produced by the pneumatic
spinning device close to the yarn accumulating device so that the
yarn is wound around the yarn accumulating device. The generation
of the whirling airflow from the second nozzle is stopped in
accordance with a timing at which the guide member brings the yarn
close to the yarn accumulating device during the yarn discharge
spinning.
[0019] Thus, the generation of the whirling airflow from the
second nozzle can be stopped without providing a dedicated detecting
section for detecting a timing at which the yarn is stably pulled
out by the yarn accumulating device.
[0020] The spinning machine described above further includes
a detecting section adapted to detect the yarn accumulated around
the yarn accumulating device. The generation of the whirling
airflow from the second nozzle is stopped in accordance with a timing
at which the detecting section detects the yarn during the yarn
discharge spinning.
[0021] Thus, the timing at which the yarn is stably pulled out
by the yarn accumulating device can be reliably detected.
[0022] The spinning machine described above further includes
a winding section, a yarn joining device, and a catching and guiding
device. The winding section is adapted to wind the yarn produced
T o n n i= i u T I 3 - 8 7 - 2 O I 5 1 7 - 33
by the pneumatic spinning device into a package. The yarn joining
device is adapted to join the yarn from the winding section and
the yarn from the pneumatic spinning device. The catching and
guiding device is adapted to catch the yarn produced by the pneumatic
spinning device and to guide the caught yarn to the yarn joining
device.
[0023] Thus, the clogging of the fibers, and the like in the
pneumatic spinning device can be prevented even in a structure in
which the spinning machine includes, for example, the catching and
guiding device that does not have a twist applying function.
[0024] According to a second aspect of the present invention,
there is provided a spinning method for performing a yarn discharge
spinning using a pneumatic spinning device including a nozzle block
and a hollow guide shaft body, the nozzle block including a first
nozzle adapted to generate whirling airflow in a spinning chamber,
and the hollow guide shaft body arranged downstream of the nozzle
block in a fiber travelling direction and including a second nozzle
adapted to generate whirling airflow for sucking a fiber bundle
whirled in the spinning chamber. The spinning method includes
generating the whirling airflow from the first nozzle and the second
nozzle at least at an instance when the yarn starts being wound
around a yarn accumulating device adapted to accumulate the yarn
produced by the pneumatic spinning device while pulling the yarn
from the pneumatic spinning device.
[0025] As the whirling airflow is continuously generated from
the second nozzle until the yarn is wound around the yarn
accumulating device, the pulling-out and the assistance of the twist
are carried out by the whirling airflow from the second nozzle,
and the clogging of the fibers in the pneumatic spinning device
can be prevented.
[Brief Description of the Drawings]
[0026]
[FIG. 1] A side view illustrating a configuration of a
spinning unit arranged in a fine spinning machine according to one
XPO DELHI 2 3-07-2015 17-33
embodiment of the present invention.
[FIG. 2] A cross-sectional view illustrating a structure
inside a pneumatic spinning device.
[FIG. 3] An enlarged perspective view illustrating a yarn
accumulating device and a shape of a first guide.
[FIG. 4] A side view illustrating a state where a yarn is caught
by a catching and guiding device.
[FIG. 5] A side view illustrating a state where a spun yarn
is guided to a yarn joining device by the catching and guiding
device.
[FIG. 6] A side view illustrating a state of an instance when
the first guide is moved and the spun yarn starts to be wound around
a yarn accumulating device.
[FIG. 7] A flowchart illustrating stopping of generation of
whirling airflow from a second nozzle and processes of changing
a spinning condition.
[FIG. 8] A timing chart illustrating a timing at which the
generation of the whirling airflow from the second nozzle is stopped
and a timing at which the spinning condition is changed.
[Mode for Carrying out the Invention]
[0027] A fine spinning machine (spinning machine) according
to one embodiment of the present invention will be described below
with reference to the drawings. "Upstream" and "downstream"
respectively refer to upstream and downstream in a travelling
direction of a fiber bundle and a spun yarn at the time of spinning.
[0028] The fine spinning machine includes a plurality of
spinning units arranged in a line, and a machine control device
(not illustrated) that collectively manages the spinning units.
Each spinning unit 2 is adapted to spin a fiber bundle 8 fed from
a draft device 7 by a pneumatic spinning device 9 to produce a spun
yarn 10, and wind the spun yarn 10 into a package 50 by a winding
section 26.
[0029] As illustrated in FIG. 1, each spinning unit 2 includes
the draft device 7, the pneumatic spinning device 9, a yarn
EJ Ft rt P i w T i z - a 7 - "> Ft i c 1 7 : 53
accumulating device 22, a yarn joining device 23, a yarn monitoring
device 25, and a winding section 26 arranged in this order from
upstream to downstream. Each section of the spinning unit 2 is
controlled by a unit controller (not illustrated) provided for each
spinning unit 2. Each section of the spinning unit 2 may be
controlled by the machine control device.
[0030] The draft device 7 includes four draft rollers, i.e.,
a back roller 16, a third roller 17, a middle roller 19 provided
with a rubber apron belt 18, and a front roller 20 in this order
from the upstream. Each draft roller is rotatably driven at a
predetermined rotation speed. The draft device 7 also includes
opposing rollers arranged to face the draft rollers. In the present
embodiment, the front roller 20 can be controlled independently
from the other draft rollers. The front roller 20 of each spinning
unit 2 may be individually driven, or the front rollers 20 of the
plurality of spinning units 2 may be driven by a common drive motor.
[0031] The draft device 7 sandwiches and transports a sliver
15, which is supplied from a sliver case (not illustrated) through
a sliver guide, between the rotating draft rollers and the opposing
rollers opposing thereto, and the sliver 15 is stretched (drafted)
to a predetermined fiber amount (or thickness) to obtain the fiber
bundle 8.
[0032] The pneumatic spinning device 9 is arranged immediately
downstream of the front roller 20. The pneumatic spinning device
9 applies twists to the fiber bundle 8 supplied from the draft device
7 to produce the spun yarn 10. In the present embodiment, a
pneumatic type spinning device which uses whirling airflow to apply
twists to the fiber bundle 8 is adopted. As illustrated in FIG.
2, the pneumatic spinning device 9 includes a nozzle block (nozzle
member) 30 and a hollow guide shaft body 34. The nozzle block 30
includes a fiber guide 31, a spinning chamber 32, and a first nozzle
33. The hollow guide shaft body 34 includes a yarn passage 35 and
a second nozzle 36. Each section of the pneumatic spinning device
9 is controlled by the unit controller.
[0033] The fiber guide 31 is a member adapted to guide the fiber
bundle 8 drafted by the draft device 7 into the pneumatic spinning
device 9. The fiber guide 31 is provided with a fiber introducing
port 31a and a guide needle 31b. The fiber bundle 8 drafted by the
draft device 7 is introduced from the fiber introducing port 31a,
and guided into the spinning chamber 32 so as to be wound around
the guide needle 31b. The first nozzle 33 injects air into the
spinning chamber 32 to generate whirling airflow in the spinning
chamber 32. The whirling airflow thereby acts on the fiber bundle
8 in the spinning chamber 32.
[0034] The hollow guide shaft body 34 is a cylindrical member,
and the yarn passage 35 is formed inside the hollow guide shaft
body 34. The second nozzle 36 injects air into the yarn passage
35 to generate whirling airflow in the yarn passage 35. A direction
of the whirling airflow generated from the second nozzle 36 is
opposite to a direction of the whirling airflow generated from the
first nozzle 33.
[0035] When carrying out the yarn discharge spinning, the
whirling airflow is generated by injecting the air from both the
first nozzle 33 and the second nozzle 36. The fiber bundle 8 drafted
by the draft device 7 is guided into the pneumatic spinning device
9 by the fiber guide 31. The air injected from the first nozzle
33 flows in a feeding direction of the fiber bundle 8 while whirling.
The fiber bundle 8 is thereby fed to the hollow guide shaft body
34 in a loose false-twisted state.
[0036] Since the yarn passage 35 is formed such that a
downstream cross-sectional area is greater than an upstream
cross-sectional area, the whirling airflow flows towards the
downstream in the yarn passage 35. The fiber bundle 8 is thereby
fed towards the downstream of the yarn passage 35. A direction of
the whirling airflow generated in the yarn passage 35 is opposite
to a direction of the whirling airflow in the spinning chamber 32,
and hence the fiber bundle 8 is discharged from the hollow guide
shaft body 34 while being spun into a fasciated yarn by a known
8
pn DELHI I3-0 7-2Q15 1 7 33
spinning method described in Japanese Unexamined Patent Publication
No. 2011-38210 and the like.
[0037] The normal spinning is carried out after the yarn
discharge spinning. The whirling airflow is generated only from
the first nozzle 33 when carrying out the normal spinning. Back
ends of the fibers of the fiber bundle 8 supplied from the draft
device 7 are swung around a periphery of a distal end of the hollow
guide shaft body 34 by the whirling airflow generated from the first
nozzle 33. Accordingly, twists are applied to the fiber bundle 8
to produce the spun yarn 10. The spun yarn 10 is passed through
the yarn passage 35 of the hollow guide shaft body 34, and fed to
an outside of the pneumatic spinning device 9 from a downstream
yarn exit (not illustrated).
[0038] In the above manner, the twists can be applied to the
fiber bundle 8 during the yarn discharge spinning and the normal
spinning to produce the spun yarn 10.
[0039] A first guide 61 (guide member, FIG. 3) adapted to guide
the spun yarn 10 is arranged downstream of the pneumatic spinning
device 9. The first guide 61 guides the spun yarn 10 to the yarn
accumulating device 22. The first guide 61 is movable to guide the
spun yarn 10 towards the yarn accumulating device 22 when performing
a yarn joining operation and the like.
[004 0] The yarn accumulating device 22 is arranged downstream
of the first guide 61. The yarn accumulating device 22 includes
a yarn accumulating roller 41, an electric motor 42 for rotatably
driving the yarn accumulating roller 41, a yarn hooking member 43,
and a yarn amount detecting sensor 44. The spun yarn 10 is
temporarily accumulated by being wound around an outer peripheral
surface of the yarn accumulating roller 41.
[0041] The yarn hooking member 43 is attached to a downstream
end of the yarn accumulating roller 41. The yarn hooking member
43 is supported in a relatively rotatable manner with respect to
the yarn accumulating roller 41. A permanent magnet is attached
to one of the yarn hooking member 43 and the yarn accumulating roller
9
T B n n != » w T i •at - m ? - -> n i c i 7 • s. z
41, and a magnetic hysteresis material is attached to the other
of the yarn hooking member 4 3 and the yarn accumulating roller 41.
Such magnetic means generates a torque against the relative rotation
of the yarn hooking member 43 with respect to the yarn accumulating
roller 41. Therefore, only when a force greater than the torque
is applied to the yarn hookinq member 43 (when a yarn tension greater
than or equal to a predetermined value is applied) , the yarn hooking
member 43 relatively rotates with respect to the yarn accumulating
roller 41, and the spun yarn 10 wound around the yarn accumulating
roller 41 can be unwound. When a force greater than the torque is
not applied to the yarn hooking member 43, the yarn hooking member
43 integrally rotates with the yarn accumulating roller 41, and
the spun yarn 10 is accumulated on the yarn accumulating roller
41.
[0042] Thus, the yarn accumulating device 22 operates to
unwind the spun yarn 10 when the yarn tension at the downstream
is increased, and stop the unwinding of the spun yarn 10 when the
yarn tension is decreased (when the spun yarn 10 starts to slacken) .
Thus, the yarn accumulating device 22 can resolve the slackening
of the spun yarn 10 and apply an appropriate tension to the spun
yarn 10 . Furthermore, the yarn hooking member 43 operates to absorb
fluctuation in the tension applied to the spun yarn 10 between the
yarn accumulating device 22 and the winding section 26, and the
fluctuation in the tension can be prevented from affecting the spun
yarn 10 from the pneumatic spinning device 9 to the yarn accumulating
device 22.
[0043] The yarn amount detecting sensor 44 is an optical sensor,
and is adapted to detect whether or not an accumulated amount of
the spun yarn 10 on the yarn accumulating device 22 is greater than
or equal to a predetermined amount.
[0044] The yarn travelling direction on the upstream of the
yarn accumulating device 22 is substantially horizontal whereas
the yarn travelling direction on the downstream of the yarn
accumulating device 22 is diagonally upward, with respect to an
IPO DELHI I 5 - 07 - 2QI S I 7 "- W%
installation surface of the fine spinning machine. Therefore, a
yarn path is bent largely (90° or more) by the yarn accumulating
device 22 during the winding of the spun yarn 10.
[0045] A second guide 62 adapted to restrict movement of the
spun yarn 10 unwound from the yarn accumulating roller 41 is arranged
downstream of the yarn accumulating roller 41. The yarn joining
device 23 is arranged downstream of the second guide 62. The yarn
joining device 23 carries out the yarn joining operation of a spun
yarn 10 (first yarn) from the. pneumatic spinning device 9 and a
spun yarn 10 (second yarn) from the package 50 when the spun yarn
10 between the pneumatic spinning device 9 and the package 50 is
disconnected for some reason. In the present embodiment, the yarn
joining device 23 is a splicer device adapted to twist yarn ends
with whirling airflow generated by compressed air. However, the
yarn joining device 23 is not limited to the splicer device, and
for example, a mechanical knotter and the like may be adopted.
[0046] The spinning unit 2 includes a catching and guiding
device adapted to guide the spun yarn 10 to the yarn joining device
23. The catching and guiding device is configured by a first
catching and guiding device 27 adapted to guide the first yarn,
and a second catching and guiding device 28 adapted to guide the
second yarn to the yarn joining device 23.
[0047 ] A basal portion of the first catching and guiding device
27 is swingably supported, and the first catching and guiding device
27 can be swung vertically with this base portion as a center of
swing. The first catching and guiding device 27 is formed in a
hollow form, and is connected to a blower (not illustrated) so as
to be able to generate suction airflow. The first catching and
guiding device 27 is swung downward to catch a yarn end of the first
yarn (see FIG. 4) . After catching the first yarn, the first catching
and guiding device 27 is swung upward to guide the first yarn to
the yarn joining device 23. If the first catching and guiding device
27 has a sucking function, the first catching and guiding device
27 can catch and guide the yarn end of the first yarn fed from the
IPO DELHI 13-97-2015 17 -¥3
pneumatic spinning device 9. The first catching and guiding device
27 may not have a twist applying function. In the present embodiment,
the second nozzle 36 functions to apply twists to the fiber bundle
8 during the yarn discharge spinning. However, the first catching
and guiding device 27 may have the twist applying function.
[0048] A basal portion of the second catching and guiding
device 28 is swingably supported, and the second catching and
guiding device 28 can be swung vertically with this base portion
as a center of swing. The second catching and guiding device 20
is also formed in a hollow form, and is connected to a blower (not
illustrated) so as to be able to generate suction airflow. The
second catching and guiding device 28 is swung upward to catch a
yarn end of the second yarn (see a chain line in FIG. 1). After
catching the second yarn, the second catching and guiding device
28 is swung downward to guide the second yarn to the yarn joining
device 23.
[0049] The yarn joining device 23 is driven while the first
yarn and the second yarn are being guided to the yarn joining device
23, so that the first yarn and the second yarn are joined and the
spun yarn 10 is connected between the pneumatic spinning device
9 and the package 50. The winding of the spun yarn 10 into the
package 50 thus can be resumed.
[0050] The yarn monitoring device 25 is arranged downstream
of the yarn joining device 23. The yarn monitoring device 25
monitors a thickness of the travelling spun yarn 10 with a
capacitance sensor (not illustrated). When a yarn defect of the
spun yarn 10 (area where abnormality is found in thickness or the
like of the spun yarn 10) is detected, the yarn monitoring device
25 transmits a yarn defect detection signal to a unit controller.
Upon receiving the yarn defect detection signal, the unit controller
drives a cutter 24 (yarn cutting device) arranged in proximity to
the yarn monitoring device 25 to cut the spun yarn 10. The yarn
monitoring device 25 is not limited to the capacitance sensor and
may be a light transmissive sensor to monitor the thickness of the
IPO DELHI 13-Q7-2015 17 "-^ 3
spun yarn 10. Foreign substances contained in the spun yarn 10 may
be monitored as the yarn defect.
[0051] The winding section 26 is arranged downstream of the
yarn accumulating device 22. The winding section 26 includes a
cradle arm 52 and a winding drum 53. A yarn path from the yarn
accumulating device 22 to the winding section 2 6 is bent and guided
by a downstream guide 63.
[0052] The cradle arm 52 can rotatably support a winding tube
51 for winding the spun yarn 10. The cradle arm 52 is swingable
with a basal portion thereof as the center of swing. Thus, even
if the spun yarn 10 is wound around the winding tube 51 and a diameter
of the package 50 is increased, the winding of the spun yarn 10
can be appropriately continued.
[0053] When a drive force of the winding drum drive motor (not
illustrated) is transmitted to the winding drum 53, the winding
drum 53 rotates while making contact with an outer peripheral
surface of the winding tube 51 or an outer peripheral surface of
the package 50. A traverse groove (not illustrated) is formed on
an outer peripheral surface of the winding drum 53, and the spun
yarn 10 is traversed by the traverse groove at a predetermined width.
Accordingly, the winding section 26 can wind the spun yarn 10 around
the winding tube 51 while traversing the spun yarn 10 to form the
package 50.
[0054] Next, a process carried out by the spinning unit 2 when
starting the spinning to carry out the yarn joining operation will
be briefly described. In FIGS. 4 to 6, the next process is
illustrated to be carried out after one process is completed to
facilitate the understanding of the drawings, but the next process
may be started before one process is completed. Note that a similar
process is carried out also in a case of starting the spinning to
start the winding of the spun yarn 10 around a new winding tube
51 without carrying out the yarn joining operation.
[0055] The spun yarn 10 becomes disconnected after yarn
breakage occurs during the winding of the package 50, or after the
Ten nci UT 13-Q7-2Q15 i 7 "-¥s
spun yarn 10 is cut by the cutter 24. In this case, the winding
section 26 stops the winding of the package 50, the draft device
7 stops the drafting of the fiber bundle 8, and the pneumatic
spinning device 9 stops the spinning. The first guide 61 moves to
a position away from the yarn accumulating device 22.
[0056] Next, the second catching and gui d.i ng device 28 is swung
upward to catch the second yarn. Thereafter, the second catching
and. guiding device 28 is swung downward while keeping the caught
second yarn to guide the second yarn to a position where the yarn
joining operation can be carried out by the yarn joining device
23.
[0057] The first catching and guiding device 27 is swung
downward to move to a position where the first yarn can be caught.
The drafting of the fiber bundle 8 by the draft device 7 is then
resumed and the yarn discharge spinning by the pneumatic spinning
device 9 is carried out. Thus, the first yarn is sucked and caught
by the first catching and guiding device 27. Thereafter, the first
catching and guiding device 27 is swung upward continuing sucking
of the first yarn to guide the first yarn to a position where the
yarn joining operation can be carried out by the yarn joining device
23. The first yarn and the second yarn are thereby guided to the
yarn joining device 23, as illustrated in FIG. 5. The pneumatic
spinning device 9 of the present embodiment continues to generate
the whirling airflow from the second nozzle 36 until the spun yarn
10 is wound by the yarn accumulating device 22 (detailed control
will be described later).
[0058] After the first catching and guiding device 27 and the
second catching and guiding device 28 guide the first yarn and the
second yarn to the yarn joining device 23, respectively, the first
guide 61 moves to approach the yarn accumulating device 22 (see
FIG. 6) . The first guide 61 thus guides the spun yarn 10 to proximity
of the yarn accumulating device 22 while catching the spun yarn
10.
[0059] The spun yarn 10 thus can be hooked to the yarn hooking
ron npt ut 1 3 - Q 7 - 2 Q I 5 17 - "^3
,_•».. p. ^^ Eta*" OmiB. *•"• B. S B G V •*» "•"• ^ • "—'
member 43 of the yarn accumulating device 22. Therefore, the spun
yarn 10 can be started to be wound around the yarn accumulating
roller 41. After the spun yarn 10 is wound around the yarn
accumulating roller 41, the pneumatic spinning device 9 stops the
injection of the air from the second nozzle 36 and stops the
generation of the whirling airflow from the second nozzle 36'.
Thereafter, when the yarn joining operation is completed, the
stopped winding drum 53 and the like are again driven. The winding
of the package 50 thus can be resumed.
[0060] Next, with reference to FIGS. 7 and 8, a description
will be made on the control of the pneumatic spinning device 9
carried out at the start of the spinning. Generally, a spinning
condition in which the yarn breakage and the clogging of the fibers
in the pneumatic spinning device 9 are less likely to occur is set
for the yarn discharge spinning, and the pneumatic spinning device
9 carries out the yarn discharge spinning under such a spinning
condition.
[0061] After starting the yarn discharge spinning as described
above (S101 of FIG. 7), the unit controller determines whether or
not the spun yarn 10 is wound around the yarn accumulating device
22 (yarn accumulating roller 41) (S102). This determination is
made, for example, based on a timing at which a process of causing
the first guide 61 to approach the yarn accumulating device 22 is
carried out or a timing at which the yarn amount detecting sensor
44 detected the spun yarn 10 greater than or equal to the
predetermined amount.
[0062] At an instance when the first guide 61 starts to approach
the yarn accumulating device 22, the spun yarn 10 is not yet wound
around the yarn accumulating device 22. Therefore, after a
predetermined time has elapsed from such an instance, the unit
controller determines that the spun yarn 10 is wound around the
yarn accumulating device 22. The spun yarn 10 may be assumed as
being wound around the yarn accumulating device 22 when a
predetermined time or more has elapsed from the start of the yarn
Ton n e t u x 1 3 - Q 7 - 2 0 1 5 1 7 - ^S
discharge spinning.
[0063] When determining that the spun yarn 10 is wound around
the yarn accumulating device 22, the unit controller stops the
injection of the air from the second nozzle 36 and starts the normal
spinning (S103, time T2 of FIG. 8) . In other words, at an instance
(time Tl of FIG. 8) when the spun yarn 10 starts to be wound around
the yarn accumulating device 22, the whirling airflow is still
generated from the second nozzle 36. As the spun yarn 10 is wound
(mechanically pulled) around the yarn accumulating devico 22/ the
spun yarn 10 is stably pulled out from the pneumatic spinning device
9, and hence the generation of the whirling airflow from the second
nozzle 36 may be stopped.
[0064] The unit controller then changes the spinning condition
(at least one of spinning speed, draft ratio, and yarn count) after
the termination of the yarn discharge spinning in accordance with
the requested package 50 (S104, time T2 of FIG. 8) . If the spinning
condition is not required to be changed for the yarn discharge
spinning and for the normal spinning, the normal spinning is
continued under the condition for the yarn discharge spinning.
While the yarn discharge spinning is being carried out, the spinning
condition is not changed. The above condition is fixed until the
spun yarn 10 is wound around the yarn accumulating device 22, and
thus the yarn breakage, the clogging of the fibers, or the like
can be prevented.
[0065] The delivery roller is arranged immediately downstream
of the pneumatic spinning device in Patent Documents 1 and 2.
Therefore, the spun yarn is pulled out from the pneumatic spinning
device by the delivery roller immediately after the yarn discharge
spinning is started. In other words, the spun yarn is mechanically
pulled out even during the yarn discharge spinning. Thus, the
clogging of the fibers in the pneumatic spinning device, and the
like are less likely to occur even if the spinning condition is
changed in a middle of the yarn discharge spinning. The fine
spinning machine of the present embodiment is a delivery roller-less
IPO DELHI 13-07-2015 17 "-^3
spinning machine, and thus the spun yarn 10 pulled out from the
pneumatic spinning device 9 is not mechanically pulled out at first
and is merely sucked and caught by the first catching and guiding
device 27. Therefore, the clogging of the fibers in the pneumatic
spinning device 9 may occur by merely changing the spinning
condition during the yarn discharge spinning, for example.
Properties of the spun yarn to be handled during the yarn discharge
spinning thus differ between Patent Documents 1 and 2, and the
present application.
[0066] As described above, the spinning machine of the present
embodiment includes the pneumatic spinning device 9 and the yarn
accumulating device 22. The pneumatic spinning device 9 includes
the nozzle block 30 and the hollow guide shaft body 34, the nozzle
block 30 including the first nozzle 33 adapted to generate whirling
airflow in the spinning chamber 32, and the hollow guide shaft body
34 arranged downstream of the nozzle block 30 in a fiber travelling
direction and including the second nozzle 36 adapted to generate
whirling airflow for sucking a fiber bundle 8 whirled in the spinning
chamber 32. The yarn accumulating device 22 accumulates the spun
yarn 10 produced by the pneumatic spinning device 9 while pulling
out the spun yarn 10. The whirling airflow is generated from the
first nozzle 33 and the second nozzle 36 at least at an instance
when the spun yarn 10 starts being wound around the yarn accumulating
device 22 during the yarn discharge spinning.
[0067] As the whirling airflow is continuously generated from
the second nozzle 36 until the spun yarn 10 is wound around the
yarn accumulating device 22, the pulling-out and the assistance
of the twist are carried out by the whirling airflow generated from
the second nozzle 36, whereby the clogging of the fibers in the
pneumatic spinning device 9 can be prevented. Furthermore, since
the generation of the whirling airflow from the second nozzle 36
is continued, the first catching and guiding device 27 may not have
the twist applying function.
[0068] In the spinning machine of the present embodiment,
Dn r*ci WT i z - R7 - > o i c 1 7 : t75
» \ i ^ &&• Sou E n B. a. <*&,, nOr. «=*- *W tf »m %«•• -a* W •** * ™* ™"r
after the spun yarn 10 is wound around the yarn accumulating device
22, the generation of the whirling airflow from the second nozzle
36 is stopped while the generation of the whirling airflow from
the first nozzle 33 is continued.
[0069] After the spun yarn 10 is wound around the yarn
accumulating device 22, the spun yarn 10 is stably pulled out by
the yarn accumulating device 22, and thus, the whirling airflow
from the second nozzle 36 is not necessary. Thus, a structure
excellent in energy saving property can be realized by stopping
the generation of the whirling airflow from the second nozzle 36.
[0070] In the spinning machine of the present embodiment, from
start of the yarn discharge spinning until the spun yarn 10 is wound
around the yarn accumulating device 22, a condition of at least
one of a spinning speed, a draft ratio, and a yarn count is fixed.
[0071] If the above condition is changed before the spun yarn
10 is stably pulled out by the yarn accumulating device 22, the
amount of fiber bundle 8 to be processed by the pneumatic spinning
device 9 changes. Thus, the yarn breakage or the clogging of the
fibers in the pneumatic spinning device 9 may occur. The above
condition is fixed until the spun yarn 10 is wound around the yarn
accumulating device 22, so that the yarn breakage, the clogging
of the fibers, or the like can be prevented.
[0072] In the spinning machine of the present embodiment,
after the spun yarn 10 is wound around the yarn accumulating device
22, the condition of at least one of the spinning speed, the draft
ratio, and the yarn count is changed.
[0073] After the spun yarn 10 is stably pulled out by the yarn
accumulating device 22, the clogging of the fiber, and the like
do not occur even if the above condition is changed. Therefore,
the spun yarn 10 may be produced by changing the condition to the
condition complying with the demand.
[0074] The spinning machine of the present embodiment may
further include the first guide 61 adapted to bring the spun yarn
10 produced by the pneumatic spinning device 9 close to the yarn
IPO DELHI 1 3 - 9 7 - 2 Q15 1 7 - i ll
accumulating device 22 so that the spun yarn 10 is wound around
the yarn accumulating device 22. The generation of the whirling
airflow from the second nozzle 36 is stopped in accordance with
a timing at which the first guide 61 brings the spun yarn 10 close
to the yarn accumulating device 22 during the yarn discharge
spinning.
[0075] Thus, the generation of the whirling airflow from the
second nozzle 36 can be stopped without providing a dedicated
detecting section for detecting a timing at which the spun yarn
10 is stably pulled out by the yarn accumulating device 22.
[007 6] The spinning machine of the present embodiment further
includes the yarn amount detecting sensor 44 adapted to detect the
spun yarn 10 accumulated around the yarn accumulating device 22.
The generation of the whirling airflow from the second nozzle 36
is stopped in accordance with a timing at which the yarn amount
detecting sensor 44 detected the spun yarn 10 during the yarn
discharge spinning.
[0077] Thus, the timing at which the spun yarn 10 is stably
pulled out by the yarn accumulating device 22 can be reliably
detected.
[0078] The preferred embodiment of the present invention has
been described above, but the structure described above may be
modified as below.
[0079] The guide needle 31b may be omitted, and a downstream
end of the fiber guide 31 may function as the guide needle 31b.
[0080] Instead of arranging the yarn joining device 23 for each
spinning unit 2, a operation cart that can move among the spinning
units 2 may be arranged and the operation cart may carry out the
yarn joining operation.
[Description of Reference Numerals and Signs]
[0081]
9: pneumatic spinning device
10: spun yarn
22: yarn accumulating device
IPQ DELHI 1 3 - 0 7 - 2 8 1 5 1 7 "- 3^3
27: first catching and guiding device (catching and guiding
device)
28: second catching and guiding device
30: nozzle block
33: first nozzle
34: hollow guide shaft body
36: second nozzle
41: yarn accumulating roller
61: first guide (guide member)

[Document Name] Scope of Claims for Patent
[Claim 1]
A spinning machine comprising:
a pneumatic spinning device including a nozzle block and a
hollow guide shaft body, the nozzle block including a first nozzle
adapted to generate whirling airflow in a spinning chamber, and
the hollow guide shaft body arranged downstream of the nozzle block
in a fiber travelling direction and including a second nozzle
adapted to generate whirling airflow for suckinq a fiber bundle
whirled in the spinning chamber; and
a yarn accumulating device adapted to accumulate the yarn
produced by the pneumatic spinning device while pulling the yarn
from the pneumatic spinning device,
wherein the whirling airflow is generated from the first
nozzle and the second nozzle at least at an instance when the yarn
starts being wound around the yarn accumulating device during a
yarn discharge spinning.
[Claim 2]
The spinning machine according to claim 1, wherein after the
yarn is wound around the yarn accumulating device, generation of
the whirling airflow from the second nozzle is stopped while
generation of the whirling airflow from the first nozzle is
continued.
[Claim 3]
The spinning machine according to claim 1 or claim 2, wherein
from start of the yarn discharge spinning until the yarn is wound
around the yarn accumulating device, a condition of at least one
of a spinning speed, a draft ratio, and a yarn count is fixed.
[Claim 4]
The spinning machine according to claim 3, wherein after the
yarn is wound around the yarn accumulating device, the condition
of at least one of the spinning speed, the draft ratio, and the
yarn count is changed.
[Claim 5]
IPO DELHI 13-87-2015 17:i^
The spinning machine according to any one of claim 1 through
claim 4, further comprising a guide member adapted to bring the
yarn produced by the pneumatic spinning device close to the yarn
accumulating device so that the yarn is wound around the yarn
accumulating device,
wherein the generation of the whirling airflow from the second
nozzle is stopped in accordance with a timing at which the guide
member brings the yarn close to the yarn accumulating device during
the yarn discharge spinning.
[Claim 6]
The spinning machine according to any one of claim 1 through
claim 4, further comprising a detecting section adapted to detect
the yarn accumulated around the yarn accumulating device,
wherein the generation of the whirling airflow from the second
nozzle is stopped in accordance with a timing at which the detecting
section detects the yarn during the yarn discharge spinning.
[Claim 7]
The spinning machine according to any one of claim 1 through
claim 6, further comprising:
a winding section adapted to wind the yarn produced by the
pneumatic spinning device into a package;
a yarn joining device adapted to join the yarn from the winding
section and the yarn from the pneumatic spinning device; and
a catching and guiding device adapted to catch the yarn
produced by the pneumatic spinning device and to guide the caught
yarn to the yarn joining device.
[Claim 8]
A spinning method for performing a yarn discharge spinning
using a pneumatic spinning device including a nozzle block and a
hollow guide shaft body, the nozzle block including a first nozzle
adapted to generate whirling airflow in a spinning chamber, and
the hollow guide shaft body arranged downstream of the nozzle block
in a fiber travelling direction and including a second nozzle
adapted to generate whirling airflow for sucking a fiber bundle
IPO DELHI 1 5 - 9 ? - 2 8 1 5 1 7 : ??3
whirled in the spinning chamber, the spinning method comprising:
generating the whirling airflow from the first nozzle and the
second nozzle at least at an instance when the yarn starts being
wound around a yarn accumulating device adapted to accumulate the
yarn produced by the pneumatic spinning device while pulling the
yarn from the pneumatic spinning device.