TEXTILE MACHINERY AND
PERIODIC UNEVENNESS DETECTING METHOD THEREIN
BACKGROUND OF THE INVENTION
5 1. Field of the Invention
The present invention relates to a textile machinery and a
periodic unevenness detecting method therein.
2. Description of the Related Art
10 Conventionally, there is known a spinning machine (a textile
machinery) described in Japanese Unexamined Patent Publication No.
62-53430 (Patent Document 1) as an art in such a field. The spinning
machine includes a draft device adapted to draft a fiber bundle. The
draft device includes a back roller, a middle roller, and a front
15 roller as a plurality of draft rollers arranged along a feeding
direction of the fiber bundle at a prescribed interval. An apron,
which is an endless elastic belt, is wound around the middle roller.
Each of the draft rollers is arranged by pair with the fiber bundle
therebetween. example, the front roller includes a front top roller
20 arranged above the fiber bundle and a front bottom roller arranged
below the fiber bundle.
The spinning machine includes a sensor arranged downstream of
the draft device and adapted to detect a variation in a yarn thickness,
and detects an unevenness of the yarn thickness by collecting data
25 from the sensor. The spinning machine according to Patent Document
1, by performing frequency analysis on the data from the sensor,
specifies that "a periodic unevenness caused by the front top roller
is an abnormality in the front top roller", "a periodic unevenness
caused by the front bottom roller is an abnormali ty in the front bottom
30 roller", "a periodic unevenness not caused by the front roller is
an abnormality in the apron", and that "an aperiodic unevenness is
an abnormality in the apron or the fiber bundle".
SUMMARY OF THE INVENTION
In the art described in Patent Document 1, an abnormality is
specified by performing the frequency analysis on the data output It from the sensor. However, depending on positions of the periodic
unevenness, a plurality of causes may be overlapping. In such a
case, the plurality of the causes could not be specified even if the
5 frequency analysis is performed.
An object of the present invention is to improve accuracy of
detecting the generation cause of the periodic unevenness, and to
provide a textile machinery and a periodic unevenness detecting method
in the textile machinery that can reduce trouble in specifying the
10 generation cause of the periodic unevenness.
A textile machinery comprises a draft device including a
plurali ty of pairs of draft rollers arranged along a feeding direction
of a fiber bundle and adapted to draft the fiber bundle using the
pairs of the draft rollers; a draft control section adapted to change
15 a peripheral speed of at least one of the pairs of the draft rollers
to control a draft ratio of the draft device; a detecting section
adapted to detect a periodic unevenne's s generated in the drafted fiber
bundle; and a periodic unevenness inspecting section adapted to
transmit a signal to the draft control section so as to draft by
20 changing the draft ratio, to acquire a detection resul t of the periodic
unevenness under a plurali ty of different draft ratios, and to inspect
a change in the detection result.
A periodic unevenness detecting method in a textile machinery
for detecting a periodic unevenness that generates in the textile
25 machinery comprising a draft device adapted to draft a fiber bundle,
the draft device including a plurality of pairs of draft rollers
arranged along a feeding direction of the fiber bundle and adapted
to draft the fiber bundle using the pairs of the draft rollers, the
method comprises: a draft control step of controlling a draft ratio
30 of the draft device by changing a peripheral speed of at least one
of the pairs of the draft rollers; a detecting step of detecting a
periodic unevenness generated in the drafted fiber bundle; and a
periodic unevenness inspecting step of acquiring a detection result
of the periodic unevenness under a plurali ty of different draft ratios,
35 and inspecting a change in the detection result.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front view of a spinning machine relating to one
5 embodiment of the present invention.
FIG. 2 is a vertical sectional view of the spinning machine
illustrated in FIG. 1.
FIG. 3 is a block diagram illustrating a unit controller of a
spinning unit relating to the embodiment of the present invention.
10 FIG. 4 is a schematic view illustrating an arrangement of draft
rollers.
FIG. 5 is a flowchart illustrating processing procedure
executed in a periodic unevenness automatic inspection mode.
FIG. 6 is a table indicating whether or not there is a change
15 in a periodic unevenness generation frequency.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Next, a spinning machine (a textile machinery) according to one
embodiment of the present invention will be described wi th reference
20 to the drawings. "Upstream" and "downstream" in the present
specification respectively indicate upstream and downstream in a
travelling direction of a yarn at the time of spinning.
A spinning machine 1 illustrated in FIG. 1 and FIG. 2 includes
a plurality of spinning units 2 arranged next to each other. The
25 spinning machine 1 includes a yarn joining cart 3 arranged so as to
freely travel along a direction in which the spinning units 2 are
arranged next to each other, a motor box 5, a central control section,
which is not illustrated, adapted to control the spinning machine
1, and a unit controller 60 adapted to control the spinning unit 2
ao (refe r to FIG. 3).
The central control section is arranged in the motor box 5, for
example. The central control section is electrically connected to
a plurality of the unit controllers 60 and adapted to control the
plurality of the unit controllers 60 in an integrated manner. The
a5 unit controller 60 is arranged in each of the spinning units 2 and
adapted to individually control each of the spinning units 2 (its
It details will be described later) .
Each of the spinning units 2 (the spinning machine) includes
a draft device 7, a spinning section 9 (an air-jet spinning device),
5 a yarn clearer 52, a yarn slack eliminating device 12 (a yarn
accumulating device), and a winding device 13 in this order from
upstream towards downstream. In the spinning uni t 2, the draft device
7 is arranged in proximi ty to an upper end of a housing 6 of the spinning
machine 1. A fiber bundle 8 fed from the draft device 7 is introduced
10 to the spinning section 9 and spun. After passing through the yarn
clearer 52, a spun yarn 10 that has been spun in the spinning section
9 is fed by the yarn slack eliminating device 12 and wound by the
winding device 13, and thereby a package 45 is formed.
The draft device 7 drafts the fiber bundle 8. The draft device
15 7 has a plurali ty of pairs of draft rollers 16, 17, 19, and 20 arranged
along a feeding direction (a transporting direction) of the fiber
bundle 8, and drafts the fiber bundle 8 using the draft rollers 16,
17, 19, and 20. The draft device 7 includes, as illustrated in FIG.
2, a back roller 16, a third roller 17, a second roller 19 around
20 which an apron belt 18 is wound, and a front roller 20 as the plurality
of draft rollers 16, 17, 19, and 20. The draft rollers 16, 17, 19,
and 20 respectively have a pair of a top roller and a bottom roller.
The top roller and the bottom roller are arranged so as to sandwich
the fiber bundle 8 therebetween. In the present specification, where
25 the back roller 16, the third roller 17, the second roller 19 and
the front roller 20 are not differentiated from each other, the back
roller 16, the third roller 17, the second roller 19, and the front
roller 20 may be described as the draft rollers 16, 17, 19, and 20.
The draft device 7 includes motors 31 to 34 to drive the
:30 bottom rollers of the plurality of the draft rollers 16, 17, 19, and
20. The motor 31 rotates the back roller 16. The motor 32 rotates
the third roller 17. The motor 33 rotates the second roller 19. The
motor 34 rotates the front roller 20. In the present embodiment, one
motor rotates one draft roller, but one motor may rotate a plurali ty
35 of draft rollers. For example, one motor may rotate both the back
roller 16 and the third roller 17, which are draft rollers located It at a low speed side.
The top rollers of the plurality of the draft rollers 16, 17,
19, and 20 are arranged to be rotated by the bottom rollers that is
5 rotated by the motors 31 to 34.
The spinning uni t 2 includes a motor control section 30 adapted
to control rotation of each of the motors 31 to 34. The motor control
section 30 is electrically connected to each of the motors 31 to 34.
The motor control section 30 can detect a load torque that is applied
10 to each of the motors 31 to 34. The motor control section 30 can detect
a rotation speed of an output shaft of each of the motors 31 to 34.
The motor control section 30 is merely required to be capable of
detecting at least either of the torque or the rotation speed.
Although a detailed configuration of the spinning section 9 is
15 not illustrated, in the present embodiment, an air-j et type is
employed, in which twists are added to the fiber bundle 8 using
whirling airflow to produce the spun yarn 10.
The yarn slack eliminating device 12 draws the spun yarn 10 from
the spinning section 9 by adding a prescribed tension to the spun
20 yarn 10. The yarn slack eliminating device 12 prevents the spun yarn
10 from slackening by accumulating the spun yarn 10 that is fed from
the spinning section 9 at the time 0 f yarn joining by the yarn joining
cart 3, or the like. Furthermore, the yarn slack eliminating device
12 adjusts the tension such that a variation in the tension of the
25 spun yarn 10 in the winding device 13 is not propagated to the spinning
section 9.
The yarn slack eliminating device 12 includes a slack
eliminating roller (a yarn accumulating roller) 21, a yarn hooking
member 22, an upstream guide 23, an electric motor 25, a downstream
30 guide 26, and a yarn accumulation amount sensor 27.
The yarn hooking member 22 is configured capable of engaging
with the spun yarn 10, and adapted, by integrally rotating with the
slack eliminating roller 21 while being engaged with the spun yarn
10, to wind the spun yarn 10 around an outer periphery of the relevant
35 slack eliminating roller 21.
The slack eliminating roller 21 accumulates the spun yarn 10
tit by winding a prescribed amount of the spun yarn 10 around the outer
periphery thereof. The slack eliminating roller 21 is rotated by the
electric motor 25. The spun yarn 10 that has been wound around the
5 outer periphery of the slack eliminating roller 21, is wound by the
rotating slack eliminating roller 21, tightening the relevant slack
eliminating roller 21, and pulls the spun yarn 10 upstream of the
yarn slack eliminating device 12. That is, since the slack
eliminating roller 21 with the spun yarn 10 wound around the outer
10 periphery thereof is rotated at a prescribed rotation speed, the yarn
slack eliminating device 12 can draw the spun yarn 10 from the spinning
section 9 at a prescribed speed while applying the prescribed tension,
and transport the spun yarn 10 to downstream at a prescribed speed.
By winding the prescribed amount of the spun yarn 10 around the
15 outer periphery of the slack eliminating roller 21, a prescribed
contact area can be secured between the slack eliminating roller 21
and the spun yarn 10. Accordingly, the slack eliminating roller 21
becomes capable of pulling the spun yarn 10 while maintaining the
spun yarn 10 with sufficient force. As a result, the yarn slack
20 eliminating device 12 can draw the spun yarn 10 from the spinning
section 9 at a stable speed without generating a slip and the like.
The yarn accumulation amount sensor 27 detects in a non-contact
manner an accumulation amount of the spun yarn 10 that is accumulated
on the slack eliminating roller 21, and transmits the accumulation
25 amount of the spun yarn 10 to the unit controller 60.
The upstream guide 23 is arranged slightly upstream of the slack
eliminating roller 21. The upstream guide 23 appropriately guides
the spun yarn 10 with regard to the outer periphery of the slack
eliminating roller 21. The upstream guide 23 prevents twists of the
ao spun yarn 10 that is propagated from the spinning section 9 from being
propagated to downstream of the relevant upstream guide 23.
The yarn clearer 52 is arranged at a posi tion on a front surface
of the housing 6 of the spinning machine 1 and between the spinning
section 9 and the yarn slack eliminating device 12. The "front surface
a5 of the housing 6" indicates a surface of a side where a yarn path
1
is formed. The spun yarn 10 spun from the spinning section 9 passes It through the yarn clearer 52 before being wound by the yarn slack
eliminating device 12. The yarn clearer 52 monitors a thickness of
the travelling spun yarn 10 and transmits a yarn defect detection
5 signal to the uni t controller 60 when detecting a yarn defect of the
spun yarn 10. The yarn clearer 52 is arranged downstream of the draft
device 7 and adapted to detect a thickness unevenness (hereinafter
simply referred to as an "unevenness") and/or a periodic thickness
unevenness (hereinafter simply referred to as a "periodic
10 unevenness") of the fiber bundle 8 drafted by the draft device 7.
The yarn clearer 52 transmits a detection result to a periodic
unevenness inspecting section 61 that will be described later.
When the yarn defect is detected, the uni t controller 60 stops
the draft device 7, the spinning section 9, or the like at a prescribed
15 timing. At this time, the unit controller 60 cuts the spun yarn 10
by stopping inj ection of compressed air from a nozzle of the spinning
section 9 that generates whirling airflow.
The unit controller 60 transmits a control signal to the yarn
joining cart 3, and the yarn joining cart 3 travels to a front of
20 the relevant spinning unit 2. Then, the unit controller 60 drives
the spinning section 9 or the like again to cause the yarn joining
cart 3 to perform the yarn joining, and the winding device 13 to resume
winding the package 45. Between when the spinning section 9 resumes
spinning and when winding is resumed, the yarn slack eliminating
25 device 12 eliminates the slackening of the spun yarn 10 that is
continuously fed from the spinning section 9 by accumulating the spun
yarn 10 around the slack eliminating roller 21.
The yarn joining cart 3 includes a splicer (a yarn joining
device) 43, a suction pipe 44, and a suction mouth 46. When a yarn
:30 breakage or a yarn cut occurs in a spinning uni t 2, the yarn joining
cart 3 travels on a rail 41 to the relevant spinning uni t 2 and stops.
While swinging vertically around an axis, the suction pipe 44 sucks
and catches a yarn end fed from the spinning section 9, and guides
the yarn end to the splicer 43. While swinging vertically around an
:35 axis, the suction mouth 46 sucks and catches a yarn end from the package
45 supported by the winding device 13, and guides the yarn end to tt the splicer 43. The splicer 43 joins the guided yarn ends.
The winding device 13 includes a cradle arm 71 swingably
supported around a support shaft 70. The cradle arm 71 rotatably
5 supports a bobbin 48 around which the spun yarn 10 is wound.
The winding device 13 includes a winding drum 72 and a traverse
device 75. The winding drum 72 is driven while being in contact wi th
an outer peripheral surface of the bobbin 48 or an outer peripheral
surface of the package 45 that is formed by winding the spun yarn
10 10 around the bobbin 48. The traverse device 75 includes a traverse
guide 76 that is capable of engaging with the spun yarn 10. By driving
the winding drum 72 using an electric motor (not illustrated) while
causing the traverse guide 76 to reciprocate by a drive means (not
illustrated), the winding device 13 rotates the package 45 being in
15 contact with the winding drum 72 and winds the spun yarn 10 while
traversing the spun yarn 10. In FIG. 1, the winding device 13 is
illustrated to wind the cheese-shaped package 45. However, the
winding device 13 may be configured to wind a cone-shaped package.
The unit controller 60 can detect an periodic abnormality in
20 the draft rollers 16, 17, 19, and 20. As illustrated in FIG. 3, the
unit controller (a control section) 60 is configured of a Central
Processing Unit (CPU) for performing arithmetic processing, a Read
Only Memory (ROM) and a Random Access Memory (RAM) for functioning
as a storage section, an input signal circuit, an output signal circuit,
25 a power circui t, or the like. In the uni t controller 60, by performing
a program stored in the storage section, the periodic unevenness
inspecting section 61 (a specifying section), a spinning condition
setting section 62, and a draft control section 63 are established.
The periodic unevenness inspecting section 61 is electrically
80 connected to the yarn clearer 52 and acquires information relating
to the periodic unevenness output from the yarn clearer 52. When
executing a periodic unevenness automatic inspection mode that will
be described later, the periodic unevenness inspecting section 61
acquires the information output from the yarn clearer 52 and transmi ts
85 a control signal to the draft control section 63 so as to automatically
9
change a draft ratio. When manually inspecting a generation cause e of the periodic unevenness, the periodic unevenness inspecting
section 61 displays the information acquired from the yarn clearer
52 in a display section 66 that will be described later. An operator
5 checks displayed contents of the display section 66 and determines
whether or not to inspect the generation cause of the periodic
unevenness. When inspecting the generation cause of the periodic
unevenness, the operator inputs an instruction for inspecting from
the display section 66, and a command for executing the inspection
10 mode is transmitted from the display section 66 to the periodic
unevenness inspecting section 61. The periodic unevenness
inspecting section 61, in accordance with the command received from
the display section 66, transmits the control signal to the control
section 63 so as to automatically change the draft ratio.
15 The spinning condition setting section 62 sets a spinning
condition required for controlling the draft ratio. The spinning
condition is set in accordance with a condition on the fiber bundle
15 before being introduced to the draft device 7. The condition on
the fiber bundle 15 before being introduced to the draft device 7
20 may be, for example, a grain (Gr/yd) of the fiber bundle 8, a material
type of the fiber bundle 8, or the like. Another spinning condi tion,
may be, for example, a spinning speed, a yarn count of the spun yarn
10 to be produced, draft ratio (TDR, BDR, IDR and/or MDR) , or the
like.
25 The draft control section 63 controls the draft ratio in
accordance with a command signal from the periodic unevenness
inspecting section 61 and/or the spinning condition setting section
62. The draft control section 63 outputs the command signal to the
motor control section 30.
30 FIG. 4 is a schematic view illustrating an arrangement of the
draft rollers, and is a view for describing a draft ratio. The draft
ratio is a ratio of the amount of fibers or the number of fibers of
a fiber bundle before and after the fiber bundle is processed by the
draft rollers. By changing the peripheral speed of the draft roller,
35 the draft ratio can be changed.
Examples of the draft ratio are the TDR (Total Draft Ratio) , e the BDR (Brake Draft Ratio), the IDR (Intermediate Draft Ratio), and
the MDR (Main Draft Ratio) .
The TDR can be described by the following equation (1).
5 TDR=BDRx IDRxMDR ... (1)
The TDR is a ratio of the amount of fibers or the number of fibers
of the fiber bundle 8 after having been processed by the front roller
20 with respect to the amount of fibers or the number of fibers of
the fiber bundle 8 before being introduced to the back roller 16.
10 By changing a peripheral speed of at least one of the plurality of
the draft rollers 16, 17, 19, and 20, the TDR can be changed.
The BDR is a ratio of the amount of fibers or the number of fibers
of the fiber bundle 8 after having been processed by the third roller
17 with respect to the amount of fibers or the number of the fibers
15 of the fiber bundle 8 before being introduced to the back roller 16.
By changing a peripheral speed of at least one of the plurality of
the draft rollers 16 and 17, the BDR can be changed.
The IDR is a ratio of the amount of fibers or the number of fibers
of the fiber bundle 8 after having been processed by the second roller
20 19 with respect to the amount of fibers or the number of fibers of
the fiber bundle 8 before being introduced to the third roller 17.
By changing a peripheral speed of at least one of the plurality of
the draft rollers 17 and 19, the IDR can be changed.
The MDR is a ratio of the amount of fibers or the number of fibers
25 of the fiber bundle 8 after having been processed by the front roller
20 with respect to the amount of fibers or the number of fibers of
the fiber bundle 8 before being introduced to the second roller 19.
By changing a peripheral speed of at least one of the plurality of
the draft rollers 19 and 20, the MDR can be changed.
:30 The spinning machine 1 includes the display section (a noti fying
section) 66 for displaying an inspection result of the periodic
unevenness inspecting section 61. The display section 66 is arranged
in a housing of the motor box 5 of the spinning machine 1, for example.
For example, the display section 66 may be a liquid crystal display.
:35 The display section 66 is electrically connected to the uni t
controller 60 and is capable of displaying information relating to
tD the generation cause of the periodic unevenness in accordance with
a signal from the unit controller 60. The operator can easily check
the information relating to the generation cause of the periodic
5 unevenness by seeing the displayed contents of the display section
66. The display section 66 can also display other information in
addition to the information relating to the generation cause of the
periodic unevenness.
Instead of or in addition to the display section 66, a voice
10 output section may be arranged in the spinning machine 1. Accordingly,
the spinning machine 1 can notify using voice and/or warning sound
whether or not there is an abnormality. As the display section 66,
a warning light also may be used.
The spinning machine 1 may include an operation button (an input
15 section) , which is not illustrated, for selecting the inspection mode
to execute the inspection by the periodic unevenness inspecting
section 61. The periodic unevenness inspecting section 61 starts to
inspect the generation cause of the periodic unevenness in accordance
with a signal from the operation button. The draft control section
20 63 changes the draft ratio by changing the peripheral speed of a
reference draft roller (16, 17, 19, or 20). The input section is not
limi ted to the operation button, but a liquid crystal display to which
input is possible by touching, may be used.
For example, the unit controller 60 may display in the display
25 section 66 information for guiding operation related to the inspection
mode. In accordance with the information displayed in the display
section 66, the operator can enter inputs from the input section,
and select the inspection mode.
Next, a periodic unevenness detection processing will be
30 described with reference to FIG. 5.
The periodic unevenness inspecting section 61 of the unit
controller 60 firstly determines whether or not a periodic unevenness
has been detected (step S1). When detecting a yarn unevenness signal
output from the yarn clearer 52, the periodic unevenness inspecting
35 section 61 determines that a periodic unevenness has been detected
1'2-
(step Sl: YES), and proceeds to step S2. When not detecting the yarn
tit unevenness signal (step Sl: NO), the periodic unevenness inspecting
section 61 continues the processing in step Sl.
In step S2, the unit controller 60, by changing the peripheral
5 speed of the front roller 20, controls the draft ratio such that the
TDR and the MDR are changed. At this time, the unit controller 60,
by making constant the peripheral speed of the draft rollers (16,
17, and 19) other than the front roller 20, controls the draft ratio
such that the IDR and the BDR are constant. The periodic unevenness
10 inspecting section 61 transmits the command signal to the draft
control section 63 to change the draft ratio.
Next, the periodic unevenness inspecting section 61 determines
(inspects) whether or not detection period (cycle, frequency) of the
periodic unevenness (a periodic unevenness length, a detection
15 result) has changed (step S3). The periodic unevenness inspecting
section 61 detects the yarn unevenness signal output from the yarn
clearer 52 and determines whether or not the detection period has
changed before and after the change of the draft ratio. When
determining that the detection period of the periodic unevenness has
20 not changed (step S3: NO), the periodic unevenness inspecting section
61 proceeds to step S4. When determining that the detection period
of the periodic unevenness has changed (step S3: YES), the periodic
unevenness inspecting section 61 proceeds to step S5. When the change
in the detection period of the periodic unevenness before and after
25 the change of the draft ratio is a prescribed level or within the
prescribed level (when the change is smaller than a determination
threshold value), the periodic unevenness inspecting section 61
determines that the detection period of the periodic unevenness has
not changed.
30 In step S4, the periodic unevenness inspecting section 61
specifies that the generation cause of the periodic unevenness is
related to the front controller 20 or is located downstream of the
front roller 20. Examples of the generation cause located downstream
of the front roller 20 may be an abnormality (e.g., a scratch,
35 vibration) in a delivery roller that is not illustrated, an
\~
abnormality (e.g., a scratch, vibration) in the yarn accumulating
• roller 21, or the like. "The abnormali ty in the delivery roller" can
be inspected when the yarn clearer 52 is arranged downstream of the
delivery roller. "The abnormality in the yarn accumulating roller
5 21" can be inspected when the yarn clearer 52 is arranged downstream
of the yarn accumulating roller 21. In the present embodiment, the
spun yarn 10 is drawn from the spinning section 9 by the yarn
accumulating roller 21. However, by arranging a delivery roller and
a nip roller, which are publicly- known, between the spinning section
10 9 and the yarn accumulating roller 21, the spun yarn 10 may be drawn
from the spinning section 9 by the deli very roller and the nip roller.
After performing the processing in step S4, the unit controller 60
proceeds to step S12.
In step S5, the unit controller 60, by changing the peripheral
15 speed of the second roller 19, controls the draft ratio such that
the MDR and the IDR are changed. At this time, the unit controller
60, by making constant the peripheral speed of the draft rollers (16,
17, and 20) other than the second roller 19, controls the draft ratio
such that the TDR and the BDR are constant. The periodic unevenness
20 inspecting section 61 transmits the command signal to the draft
control section 63 to change the draft ratio.
Next, the periodic unevenness inspecting section 61 determines
whether or not the detection period of the periodic unevenness (the
periodic unevenness length) has changed (step S6). The periodic
25 unevenness inspecting section 61 detects the yarn unevenness signal
output from the yarn clearer 52 and determines whether or not the
detection period has changed before and after the change of the draft
ratio. When determining that the detection period of the periodic
unevenness has changed (step S6: YES), the periodic unevenness
ao inspecting section 61 proceeds to step S7. When determining that the
detection period of the periodic unevenness has not changed (step
S6: NO), the periodic unevenness inspecting section 61 proceeds to
step S8. When the change in the detection period of the periodic
unevenness before and after the change of the draft ratio is greater
a5 than a prescribed level (when the change is greater than a
l'i
determination threshold value), the periodic unevenness inspecting
It section 61 determines that the detection period of the periodic
unevenness has changed.
In step S7, the periodic unevenness inspecting section 61
5 specifies that the generation cause of the periodic unevenness is
related to the second roller 19 (or the apron belt 18) (an element
related to the reference draft roller). After performing the
processing in step S7, the unit controller 60 proceeds to step S12.
In step S8, the uni t controller 60, by changing the peripheral
10 speed of the third roller 17, controls the draft ratio such that the
IDR and the BDR are changed. At this time, the unit controller 60,
by making constant the peripheral speed of the draft rollers (16,
19, and 20) other than the third roller 17, controls the draft ratio
such that the MDR and the TDR are constant. The periodic unevenness
15 inspecting section 61 transmits the command signal to the draft
control section 63 to change the draft ratio.
Next, the periodic unevenness inspecting section 61 determines
whether or not the detection period of the periodic unevenness (the
periodic unevenness length) has changed (step S9). The periodic
20 unevenness inspecting section 61 detects the yarn unevenness signal
output from the yarn clearer 52 and determines whether or not the
detection period has changed before and after the change of the draft
ratio. When determining that the detection period of the periodic
unevenness has changed (step S9: YES), the periodic unevenness
25 inspecting section 61 proceeds to step S10. When determining that
the detection period of the periodic unevenness has not changed (step
S9: NO), the periodic unevenness inspecting section 61 proceeds to
step Sll.
In step S10, the periodic unevenness inspecting section 61
30 specifies that the generation cause of the periodic unevenness is
related to the third roller 17. After performing the processing in
step Sll, the periodic unevenness inspecting section 61 proceeds to
step S12.
In step Sll, the periodic unevenness inspecting section 61
35 specifies that the generation cause of the periodic unevenness is
\1)
5
20
:35
related to the back roller 16 or the fiber bundle 8 before being
It inserted into the back roller 16 (a preceding process). After
performing the processing in step Sll, the uni t controller 60 proceeds
to step S12.
When further specifying that the generation cause of the
periodic unevenness is located at the back roller 16, the operator
sets in another draft device, the fiber bundle 8 that is currently
being used. When the same fiber bundle 8 is drafted by the relevant
another draft device and a similar periodic unevenness is not detected,
10 the generation cause of the periodic unevenness can be specified to
be located at the back roller 16 of the previous draft device 7.
When further specifying that the generation cause of the
periodic unevenness is located in the preceding process, the operator
sets in the draft device 7, another fiber bundle that is different
15 from the fiber bundle 8 currently being used. When the relevant
another fiber bundle is drafted by the draft device 7 and a similar
periodic unevenness is not detected by the periodic unevenness
inspecting section 61, the generation cause of the periodic unevenness
can be specified to be located at the previous fiber bundle 8.
In step S12, the periodic unevenness inspecting section 61
displays the information relating to the generation cause of the
periodic unevenness (the inspection result) in the display section
66. The display section 66 displays the information relating to a
specification result of the generation cause of the periodic
25 unevenness in accordance with the signal output from the unit
controller 60. For example, the display unit 66 displays that the
generation cause of the periodic unevenness that is being generated
in the spun yarn 10 is located at the front roller 20. The display
section 66 may display as character information the draft rollers
:30 16, 17, 19, or 20 that is the generation cause of the periodic
unevenness. For example, the display section 66 may display a layout
drawing of the draft rollers 16,17,19, and 20 and highlight (e.g.,
display in red or by flashing) only a draft roller, which is the
generation cause.
When the periodic abnormality is determined to exist in the
I")
1I
}{
i:Jdraft
rollers 16, 17, 19, or 20, the unit controller 60 may stop
" operation of the spinning uni t 2 instead of or in addi tion to a resul t
display in step S12. When the uni t controller 60 stops the operation
of the spinning uni t 2, the unit controller 60 may cause the display
5 section 66 to display that the draft ratio and/or a gauge distance
(a distance between the draft rollers) is inappropriate and/or that
the draft rollers 16, 17, 19, and/or 20 are required to be replaced.
When the draft ratio and/or the gauge distance are inappropriate,
the draft unevenness is generated.
10 In this manner, according to the spinning machine 1 of the
present embodiment, when the periodic unevenness of the drafted fiber
bundle 8 is detected, the draft ratio in the draft device 7 can be
changed. Since a generated position (the generation period) of the
periodic unevenness in the fiber bundle 8 varies according to the
15 change of the draft ratio, the spinning machine 1, by detecting the
periodic unevenness under a plurality of different draft ratios, can
accurately specify the generation cause of the periodic unevenness
in accordance wi th the detection result. Depending on the generated
posi tion of the periodic unevenness in the fiber bundle 8, the periodic
20 unevenness may be generated by a plurali ty of overlapped causes. In
such a case, by changing the draft ratio and inspecting the generation
cause of the periodic unevenness, a range where the generation cause
of the periodic unevenness may exist can be limited. As a result,
trouble in specifying the generation cause of the periodic unevenness
25 can be reduced.
In the spinning machine 1 of the present embodiment, since the
generation cause of the periodic unevenness can be specified, an
abnormal portion (the periodic unevenness) in the yarn 10 can be
detected. The spinning machine 1 is also capable of compensating
:30 accuracy of detection by the yarn clearer 52. For example, even when
the accuracy of the detection by the yarn clearer 52 is low, the
periodic unevenness can be detected by executing the periodic
unevenness automatic inspection mode.
When changing the draft ratio, the spinning machine 1 firstly
:35 changes the downstream draft ratio (the TDR and the MDR) by changing
11
the peripheral speed of the front roller 20 (step S2). The spinning
tD machine 1 can firstly specify the generation cause located at the
front roller 20 or downstream of the front roller 20 by changing the
TDR and the MDR. Since the periodic unevenness of which generation
5 cause is located at the front roller 20 or downstream of the front
roller 20 generates more frequently than the periodic unevenness of
which generation cause is located in the preceding process or at the
back roller 16, the generation cause is more likely to be immediately
specified by changing the downstream draft ratio (the TDR and the
10 MDR) first than by changing the upstream draft ratio (the BDR and
the TDR) first.
Next, with reference to FIG. 6, a description will be made on
how the changing of the peripheral speed of each one of the draft
rollers 16, 17, 19, and 20 relates to specification of the generation
15 cause of the periodic unevenness (whether or not there is a change
in a frequency). A verification has been performed as to whether the
generation cause of which periodic unevenness can be specified by
changing the peripheral speed of which one of the draft rollers 16,
17, 19, and 20. In a table of FIG. 6, a left column indicates the
20 peripheral speed of which one of the draft rollers 16, 17, 19, and
20 is changed, and an upper row indicates the generation causes of
the periodic unevenness.
In FIG. 6, "Y" indicates that the frequency always changes. In
FIG. 6, "N" indicates that the frequency does not change. The change
25 in the frequency indicates that the change in the generation period
of the periodic unevenness (the periodic unevenness length) before
and after the change of the draft ratio is greater than a prescribed
level. No change in the frequency indicates that the change in the
generation period of the periodic unevenness is the prescribed level
30 or within the prescribed level.
When changing the peripheral speed of the front roller 20 and
making constant the peripheral speed of the draft rollers (16, 17,
and 19) other than the front roller 20, the frequency always changes
in a case where the generation cause of the periodic unevenness is
35 located at the back roller 16 or upstream of the back roller 16 (in
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the precedent process or at the back roller 16), in a case where the
lit generation cause of the periodic unevenness is located at the third
roller 17, and in a case where the generation cause of the periodic
unevenness is located at the second roller 19 (the apron belt 18) .
5 When changing the peripheral speed of the front roller 20 and making
constant the peripheral speed of the draft rollers (16, 17, and 19)
other than the front roller 20, the frequency does not change in a
case where the generation cause of the periodic unevenness is located
at the front roller 20 or downstream of the front roller 20.
When changing the peripheral speed of the second roller 19 and
making constant the peripheral speed of the draft rollers (16, 17,
and 20) other than the second roller 19, the frequency always changes
in the case where the generation cause of the periodic unevenness
is located at the second roller 19 (the apron belt 18). When changing
15 the peripheral speed of the second roller 19 and making constant the
peripheral speed of the draft rollers (16, 17, and 20) other than
the second roller 19, the frequency does not change in the case where
the generation cause of the periodic unevenness is located at the
back roller 16 or upstream of the back roller 16 (in the precedent
20 process or at the back roller 16), in the case where the generation
cause of the periodic unevenness is located at the third roller 17,
and in the case where the generation cause of the periodic unevenness
is located at the front roller 20 or downstream of the front roller
20.
When changing the peripheral speed of the third roller 17 and
making constant the peripheral speed of the draft rollers (16, 19,
and 20) other than the third roller 17, the frequency always changes
in the case where the generation cause of the periodic unevenness
is located at the third roller 17. When changing the peripheral speed
30 of the third roller 17 and making constant the peripheral speed of
the draft rollers (16, 19, and 20) other than the third roller 17,
the frequency does not change in the case where the generation cause
of the periodic unevenness is located at the back roller 16 or upstream
of the back roller 16 (in the precedent process or at the back roller
35 16), in the case where the generation cause of the periodic unevenness
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is located at the second roller 19 (the apron belt 18), and in the e case where the generation cause of the periodic unevenness is located
at the front roller 20 or downstream of the front roller 20.
When changing the peripheral speed of the back roller 16 and
5 making constant the peripheral speed of the draft rollers (17, 19,
and 20) other than the back roller 16, the frequency always changes
in the case where the generation cause of the periodic unevenness
is located at the back roller 16 or upstream of the back roller 16
(in the precedent process or at the back roller 16). When changing
10 the peripheral speed of the back roller 16 and making constant the
peripheral speed of the draft rollers (17, 19, and 20) other than
the back roller 16, the frequency does not change in the case where
the generation cause of the periodic unevenness is located at the
third roller 17, in the case where the generation cause of the periodic
15 unevenness is located at the second roller 19 (the apron belt 18),
and in the case where the generation cause of the periodic unevenness
is located at the front roller 20 or downstream of the front roller
20.
The present invention is specifically described based on its
20 embodiment as above, but the present invention is not limi ted to the
above-described embodiment.
According to the above-described embodiment, the spinning
machine 1 (an air-jet spinning machine) does not include a delivery
roller and a nip roller, but the spinning machine of the present
25 invention may be, without limited thereto, provided with the delivery
roller and the nip roller. The delivery roller and the nip roller
are, for example, arranged downstream of the spinning section 9. The
spun yarn 10 spun from the spinning section 9 is sandwiched and
transported between the delivery roller and the nip roller, and wound
30 by the winding device 13.
The textile machinery is not limited to the air-jet spinning
machine, but may be another textile machinery provided wi th the draft
device. The textile machinery may be a ring spinning machine and a
drawing frame.
35 In the above-described embodiment, when the yarn defect is
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detected, the spun yarn 10 is cut by stopping the injection of the tt compressed air from the whirling airflow generating nozzle of the
spinning device 9. However, the spun yarn 10 may be cut by another
method. For example, the spun yarn 10 can be cut using a cutter, which
5 is not illustrated, arranged between the spinning section 9 and the
yarn clearer 52.
In the spinning machine 1 according to the above-described
embodiment, the yarn path is arranged downward from above in a
direction of machine height. However, the yarn path may be arranged
10 upward from below.
Al though the spinning section 9 preferably has a configuration
in which a needle (a needle-like member) is provided for preventing
the interior twists from propagating to the front roller 20, the
spinning section 9 may not be provided with the needle.
The air-jet spinning machine may be configured such that a
bottom roller of the draft device and/or a traverse mechanism of the
winding device are commonly driven in the plurali ty of spinning uni ts
2 (line shaft). The air-jet spinning machine may have a configuration
in which the draft device and/or the winding device are independently
20 arranged in each winding unit.
The spinning machine 1 according to the above-described
embodiment includes the unit controller 60 for individually
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controlling each of the spinning uni ts 2. However, the unit
25
controller 60 for controlling a prescribed number of the spinning
units 2 may be arranged in every prescribed number of the spinning
units 2.
The spinning machine 1 according to the above-described
embodiment includes the plurali ty of the uni t controllers 60 and each
uni t controller 60 controls each spinning uni t 2. However, one uni t
:30 controller 60 may control the plurality of the spinning uni ts 2, or
the central control section may collectively control all of the
spinning units 2 provided in the spinning machine 1.
In the spinning machine 1 according to the above-described
embodiment, when the yarn clearer 52 detects the periodic unevenness,
35 the unit controller 60 executes the periodic unevenness automatic
'2--inspection mode (see FIG. 5) for automatically specifying the e generation cause of the periodic unevenness. However, the inspection
mode may be executed in accordance with an input operation by the
operator. For example, in a flowchart illustrated in FIG. 5, step
5 81 may not be performed and when button operation (the input operation
by the operator) is detected, the change of the draft ratio (the TDR
and the MDR) may be started by changing the peripheral speed of the
front roller 20 in step 82. Furthermore, the spinning machine may
select the draft roller 16, 17, 19, or 20, of which the peripheral
10 speed is to be changed, in accordance with the input operation by
the operator.
For example, in the flowchart illustrated in FIG. 5, as the
change of the peripheral speed of the draft rollers 16, 17, 19, and
20, the change of the peripheral speed of the front roller 20 (step
15 82), the second roller 19 (step 85), the third roller 17 (step 88),
and the back roller 16 (step 811) can be performed. The change of
the peripheral speed of the draft rollers 16, 17, 19, and 20 is not
limited thereto. For example, the spinning machine may change the
peripheral speed of the front roller 20 (step 82) as the change of
20 the peripheral speed of the draft roller, and automatically specify
only the generation cause that is located at the front roller 20 or
downstream of the front roller 20.
In the flowchart illustrated in FIG. 5, the change of the
peripheral speed of the front roller 20 (step 82), the second roller
25 19 (step 85), the third roller 17 (step 88), and the back roller 16
(step 811) can be performed in this order. The change 0 f the
per ipheral speed of the draft rollers 16, 17, 19, and 20 is not limi ted
thereto. For example, the change of the peripheral speed of the back
roller 16, the third roller 17, the second roller 19, and the front
30 roller 20 may be performed in this order.
For example, a case where the change of the peripheral speed
of the third roller 17 (step 88), the back roller 16 (step 811), the
front roller 20 (step 82), and the second roller 19 (step 85) is
performed in this order will be described. When determining that the
35 periodic unevenness is detected in the processing of step 81, the
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unit controller 60 proceeds to step 58. In the following step 59, e when determining that the detection period of the periodic unevenness
has not changed, the unit controller 60 changes the peripheral speed
of the back roller 16. Then, the uni t controller 60 determines whether
5 or not the detection period has been changed before and after the
change of the peripheral speed of the back roller 16. At this point,
when determining that the detection period has' changed, the periodic
unevenness inspecting section 61 proceeds to step 511 and determines
that the generation cause of the periodic unevenness is related to
10 the back roller 16. On the other hand, when determining that the
detection period has not changed, the periodic unevenness inspecting
section 61 proceeds to step 52 and changes the peripheral speed of
the front roller 20. Then, the subsequent processing illustrated in
FIG. 5 is executed.
As a first al ternative embodiment, the spinning machine may have
a configuration in which the nip roller and the delivery roller (the
draft roller) are further provided downstream of the spinning section
9. In the case of the spinning machine having this configuration,
the draft ratio between the nip roller downstream of the spinning
20 section 9 and the back roller 16 arranged most upstream may be an
overall draft ratio (TDR2), and the draft ratio between the nip roller
and the front roller 20 may be MDR2. In such a case, the TDR2 and
the MDR2 may be changed by changing the peripheral speed of the nip
roller. In a case where there is no change in the periodic unevenness
25 length when the TDR2 and the MDR2 are changed, the generation cause
can be specified to be located at the nip roller or downstream of
the nip roller.
As a second alternative embodiment, the draft ratio between the
slack eliminating roller 21 (the yarn accumulating roller) of the
ao yarn slack eliminating device 12 (the yarn accumulating device) and
the back roller 16 arranged most upstream may be an overall draft
ratio (TDR3), and the draft ratio between the slack eliminating roller
21 and the front roller 20 may be MDR3. In such a case, the TDR3 and
the MDR3 may be changed by changing the peripheral speed of the slack
a5 eliminating roller 21. In a case where there is no change in the
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periodic unevenness length when the TDR3 and the MDR3 are changed, tD the generation cause can be specified to be located at the slack
eliminating roller 21 or downstream of the slack eliminating roller
21.
In the above-described embodiments, the peripheral speed of the
draft rollers 16, 17, 19, and 20 is changed by changing the output
of the motor 31 to 34. The change of the peripheral speed, without
limi ted thereto, may be performed by another method. The peripheral
speed of the draft rollers 16, 17, 19, and 20 may be changed to change
10 the draft ratio by changing a gear ratio, a transmission ratio, or
the like of a transmission mechanism that transmits the output of
the motor 31 to 34.
In the above-described embodiments, although the spinning
machine includes four draft rollers 16, 17, 19, and 20, the number
15 of the draft rollers is not limited to four, but for example, may
be three, or five or more. Any number of the draft rollers between
the most upstream draft roller 16 and the most downstream draft roller
20 may be arranged.
A textile machinery according to the present invention includes
20 a draft device having a plurali ty of pairs of draft rollers arranged
along a feeding direction of a fiber bundle and adapted to draft the
fiber bundle using the draft rollers, a draft control section adapted
to change a peripheral speed of the draft roller to control a draft
ratio of the draft device, a detecting section adapted to detect a
25 periodic unevenness generated in the drafted fiber bundle, and a
periodic unevenness inspecting section adapted to transmit a signal
to the draft control section so as to draft by changing the draft
ratio, to acquire a detection result of the periodic unevenness under
a plurality of different draft ratios, and to inspect a change in
30 the detection result.
A generation period (a frequency) of the periodic unevenness
in the fiber bundle varies according to a change of the draft ratio.
The textile machinery can accurately specify the generation cause
of the periodic unevenness by detecting the periodic unevenness under
35 the plurality of different draft ratios and inspecting the change
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in the detection result. Depending on generated positions of the e periodic unevenness on the fiber bundle, the periodic unevenness may
be generated by a plurality of overlapped factors. In such a case,
by changing the draft ratio and inspecting the change in the detection
5 result, a range (a position) where the generation cause of the periodic
unevenness may exist can be limited. As a result, trouble in
20
specifying the generation cause of the periodic unevenness can be
reduced.
The periodic unevenness inspecting section includes a
10 specifying section adapted to specify the generation cause of the
periodic unevenness from the inspection result of the periodic
unevenness inspecting section. The draft control section changes the
draft ratio by changing the peripheral speed of a reference draft
roller, which is at least one of the draft rollers, and maintaining
15 the peripheral speed of the draft rollers other than the reference
draft roller. The specifying section can specify the generation
cause of the periodic unevenness in accordance with the detection
resul t of the periodic unevenness before and after the change of the
draft ratio.
The draft control section changes the draft ratio by changing
the peripheral speed of the draft roller located most downstream in
the feeding direction as the reference draft roller and maintaining
the peripheral speed of the draft rollers other than the reference
draft roller. When the change in the detection resul t of the periodic
25 unevenness before and after the change of the draft ratio is a
prescribed level or within the prescribed level, the specifying
section can specify that the generation cause of the periodic
unevenness is located at the reference draft roller or downstream
of the reference draft roller. In this case, as the generation cause
ao located at the reference draft roller or downstream of the reference
draft roller, there may be a front roller that is the most downstream
draft roller, a nip roller, a delivery roller, and a slack eliminating
roller.
The draft control section changes the draft ratio by changing
:35 the peripheral speed of the reference draft roller, which is a draft
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roller other than the most downstream draft roller and the most
tit upstream draft roller in the feeding direction, and maintaining the
peripheral speed of the draft rollers other than the reference draft
roller. When the change in the detection result of the periodic
5 unevenness before and after the change of the draft ratio is greater
than a prescribed level, the specifying section can specify that the
generation cause of the periodic unevenness is located at the
reference draft roller or an element related to the reference draft
roller. An example of the element related to the reference draft
roller is an apron belt wound around the draft roller.
The draft control section changes the draft ratio by changing
the peripheral speed of the draft roller located most upstream in
the feeding direction as the reference draft roller and maintaining
the peripheral speed of the draft rollers other than the reference
15 draft roller. When the change in the detection resul t of the periodic
unevenness before and after the change of the draft ratio is greater
than a prescribed level, the specifying section can specify that the
generation cause of the periodic unevenness is located at the
reference draft roller or upstream of the reference draft roller.
The textile machinery may further include a notifying section
adapted to notify information relating to the generation cause.
Since an operator can easily check the generation cause of the periodic
unevenness in accordance with the information notified by the
notifying section, an appropriate countermeasure can be promptly
25 taken. An example of the notifying section may be a display section,
a voice output section, or the like. When the notifying section is
the display section, the operator can easily check the generation
cause of the periodic unevenness by seeing the display section of
the spinning machine.
The textile machinery may include an input section for selecting
an inspection mode in which inspection by the periodic unevenness
inspecting section is executed, and the periodic unevenness
inspecting section may start the inspection in accordance with a
signal from the input section. When an input operation by the operator
:35 is detected by the input section, the inspection mode can be executed.
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The operator can easily switch to the inspection mode by performing
It the input operation as required.
The textile machinery further includes a spinning section
adapted to spin by airflow, the fiber bundle drafted by the draft
5 device to produce a spun yarn. The detecting section may be a clearer
arranged downstream of the spinning section in the feeding direction
of the fiber bundle and adapted to detect the periodic unevenness
of the spun yarn. The periodic unevenness is detected using the
clearer that is typically provided in the spinning machine, and the
10 periodic unevenness inspecting section can execute inspection on the
periodic unevenness in accordance with the detection. Since the
detecting section for detecting the periodic unevenness is not
required to be newly arranged, a configuration can be simple.
A periodic unevenness detecting method in a textile machinery
15 according to the present invention is a method for detecting a periodic
unevenness that generates in the textile machinery including a draft
device adapted to draft a fiber bundle. The draft device has a
plurali ty of pairs of draft rollers arranged along a feeding direction
of the fiber bundle and is adapted to draft the fiber bundle using
20 the draft rollers. The periodic unevenness detecting method includes
a draft control step of controlling a draft ratio in the draft device
by changing a peripheral speed of the draft roller, a detecting step
of detecting the periodic unevenness generated in the drafted fiber
bundle, and a periodic unevenness inspecting step of acquiring a
25 detection result of the periodic unevenness under a plurality of
different draft ratios and inspecting a change in the detection
result.
Since a generation period of the periodic unevenness in the
fiber bundle varies according to a change of the draft ratio, a
ao generation cause of the periodic unevenness can be accurately
specified by detecting the periodic unevenness under the plurality
of different draft ratios and inspecting the change in the detection
resul t. Depending on generated posi tions of the periodic unevenness
on the fiber bundle, the periodic unevenness may be generated by a
:35 p l urali ty of overlapped causes. In such a case, by changing the draft
I
ratio and inspecting the change in the detection result, a range (a
~ position) where the generation cause of the periodic unevenness may
exist can be limited. As a result, trouble in specifying the
5
generation cause of the periodic unevenness can be reduced.
The periodic unevenness inspecting step includes a specifying
step of specifying the generation cause of the periodic unevenness
from the inspection resul t of the periodic unevenness inspecting step.
In the draft control step, control of changing the draft ratio is
performed by changing the peripheral speed of a reference draft roller,
10 which is at least one of the draft rollers, and maintaining the
peripheral speed of the draft rollers other than the reference draft
roller. In the specifying step, the generation cause of the periodic
unevenness can be specified in accordance with the detection result
of the periodic unevenness before and after the change of the draft
15 ratio.
In the draft control step, control of changing the draft ratio
is performed by changing the peripheral speed of the draft roller
located most downstream in the feeding direction as the reference
draft roller and maintaining the peripheral speed of the draft rollers
20 other than the reference draft roller. In the specifying step, when
the change in the detection resul t of the periodic unevenness before
and after the change of the draft ratio is a prescribed level or wi thin
the prescribed level, the generation cause of the periodic unevenness
can be specified to be located at the reference draft roller or
25 downstream of the reference draft roller.
In the draft control step, the draft ratio is changed by changing
the peripheral speed of the reference draft roller, which is the draft
roller other than the most downstream draft roller and the most
upstream draft roller in the feeding direction, and maintaining the
:30 peripheral speed of the draft rollers other than the reference draft
roller. In the specifying step, when the change in the detection
resul t of the periodic unevenness before and after the change of the
draft ratio is greater than a prescribed level, the generation cause
of the periodic unevenness can be specified to be located at the
35 reference draft roller or an element related to the reference draft
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roller. e In the draft control step, the draft ratio is changed by changing
the peripheral speed of the draft roller located most upstream in
the feeding direction as the reference draft roller and maintaining
5 the peripheral speed of the draft rollers other than the reference
draft roller. In the specifying step, when the change in the detection
resul t of the periodic unevenness before and after the change of the
draft ratio is greater than a prescribed level, the generation cause
of the periodic unevenness can be specified to be located at the
10 reference draft roller or upstream of the reference draft roller.
1

WE CLAIM:
tit 1. A textile machinery comprising:
a draft device including a plurali ty of pairs of draft rollers
arranged along a feeding direction of a fiber bundle and adapted to
5 draft the fiber bundle using the pairs of the draft rollers;
a draft control section adapted to change a peripheral speed
of at least one of the pairs of the draft rollers to control a draft
ratio of the draft device;
a detecting section adapted to detect a periodic unevenness
10 generated in the drafted fiber bundle; and
a periodic unevenness inspecting section adapted to transmit
a signal to the draft control section so as to draft by changing the
draft ratio, to acquire a detection resul t of the periodic unevenness
under a plurality of different draft ratios, and to inspect a change
15 in the detection result.
2. The textile machinery according to claim 1, wherein the
periodic unevenness inspecting section includes a specifying section
adapted to specify a generation cause of the periodic unevenness from
20 an inspection resul t of the periodic unevenness inspecting section;
the draft control section is adapted to change the draft ratio
by changing the peripheral speed of a reference draft roller, which
is at least one of the draft rollers, and maintaining the peripheral
speed of the draft rollers other than the reference draft roller;
25 and
the specifying section is adapted to specify the generation
cause of the periodic unevenness in accordance with the detection
resul t of the periodic unevenness before and after the change of the
draft ratio.
3. The textile machinery according to claim 2, wherein the
draft control section is adapted to change the draft ratio by changing
the peripheral speed of the draft roller located most downstream in
the feeding direction as the reference draft roller and maintaining
35 the peripheral speed of the draft rollers other than the reference
draft roller; and e when the change in the detection result of the periodic
unevenness before and after the change of the draft ratio is a
prescribed level or within the prescribed level, the specifying
5 section is adapted to specify that the generation cause of the periodic
unevenness is located at the reference draft roller or downstream
of the reference draft roller.
4. The textile machinery according to claim 2, wherein the
10 draft control section is adapted to change the draft ratio by changing
the peripheral speed of the reference draft roller, which is a draft
roller other than the most downstream draft roller and the most
upstream draft roller in the feeding direction, and maintaining the
peripheral speed of the draft roller other than the reference draft
15 roller; and
when the change in the detection result of the periodic
unevenness before and after the change of the draft ratio is greater
than a prescribed level, the specifying section is adapted to specify
that the generation cause of the periodic unevenness is located at
20 the reference draft roller or an element related to the reference
draft roller.
5. The textile machinery according to claim 2, wherein the
draft control section is adapted to change the draft ratio by changing
25 the peripheral speed of the draft roller located most upstream in
the feeding direction as the reference draft roller and maintaining
the peripheral speed of the draft rollers other than the reference
draft roller; and
when the change in the detection resul t of the periodic
ao unevenness before and after the change of the draft ratio is greater
than a prescribed level, the specifying section is adapted to specify
that the generation cause of the periodic unevenness is located at
the reference draft roller or upstream of the reference draft roller.
:35 6. The textile machinery according to anyone of claim 2 through
claim 5, further comprising a notifying section adapted to notify
It information relating to the generation cause.
7. The textile machinery according to anyone of claim 1 through
5 claim 6, further comprising an input section adapted to select an
inspection mode to execute the inspection by the periodic unevenness
inspecting section;
wherein the periodic unevenness inspecting section is adapted
to start the inspection in accordance with a signal from the input
10 section.
8. The textile machinery according to anyone of claim 1 through
claim 7, further comprising a spinning section adapted to spin by
airflow, the fiber bundle drafted by the draft device, to produce
15 a spun yarn;
wherein the detecting section is a clearer arranged downstream
of the spinning section in the feeding direction of the fiber bundle
and adapted to detect the periodic unevenness of the spun yarn.
20 9. A periodic unevenness detecting method in a textile
machinery for detecting a periodic unevenness that generates in the
textile machinery comprising a draft device adapted to draft a fiber
bundle, the draft device including a plurality of pairs of draft
rollers arranged along a feeding direction of the fiber bundle and
25 adapted to draft the fiber bundle using the pairs of the draft rollers,
the method comprising:
a draft control step of controlling a draft ratio of the draft
device by changing a peripheral speed of at least one of the pairs
of the draft rollers;
30 a detecting step of detecting a periodic unevenness generated
in the drafted fiber bundle; and
a periodic unevenness inspecting step of acquiring a detection
resul t of the periodic unevenness under a plurali ty of different draft
ratios, and inspecting a change in the detection result.
:35
10. The periodic unevenness detecting method in the textile
It machinery according to claim 9, wherein the periodic unevenness
inspecting step includes a specifying step of specifying a generation
cause of the periodic unevenness from an inspection result of the
5 periodic unevenness inspecting step;
in the draft control step, control of changing the draft ratio
is performed by changing the peripheral speed of a reference draft
roller, which is at least one of the draft rollers, and maintaining
the peripheral speed of the draft rollers other than the reference
10 draft roller; and
in the specifying step, the generation cause of the periodic
unevenness is specified in accordance with the detection result of
the periodic unevenness before and after the change of the draft ratio.
15 11. The periodic unevenness detecting method in the textile
machinery according to claim 10, wherein in the draft control step,
control of changing the draft ratio is performed by changing the
peripheral speed of the draft rollers located most downstream in the
feeding direction as the reference draft roller and maintaining the
20 peripheral speed of the draft rollers other than the reference draft
roller; and
in the specifying step, when the change in the detection resul t
of the periodic unevenness before and after the change or the draft
ratio is a prescribed level or within the prescribed level, the
25 generation cause of the periodic unevenness is specified to be located
at the reference draft roller or downstream of the reference draft
roller.
12. The periodic unevenness detecting method in the textile
ao machinery according to claim 10, wherein in the draft control step,
the draft ratio is changed by changing the peripheral speed of the
reference draft roller, which is the draft roller other than the most
downstream draft roller and the most upstream draft roller in the
feeding direction, and maintaining the peripheral speed of the draft
a5 rollers other than the reference draft roller; and
in the specifying step, when the change in the detection resul t
tit of the periodic unevenness before and after the change of the draft
ratio is greater than a prescribed level, the generation cause of
the periodic unevenness is specified to be located at the reference
5 draft roller or an element related to the reference draft roller.
13. The periodic unevenness detecting method in the textile
machinery according to claim 10, wherein in the draft control step,
the draft ratio is changed by changing the peripheral speed of the
10 draft roller located most upstream in the feeding direction as the
reference draft roller and maintaining the peripheral speed of the
draft rollers other than the reference draft roller; and
in the specifying step, when the change in the detection resul t
of the periodic unevenness before and after the change of the draft
15 ratio is greater than a prescribed level, the generation cause of
the periodic unevenness is specified to be located at the reference
draft roller or upstream of the reference draft roller.
14. A textile machinery, substantially as herein described
20 with reference to accompanying drawings and examples.
15. A periodic unevenness detecting method in a textile
machinery, substantially as herein described wi th reference to
accompanying drawings and examples.
25
:30
Dated this 19t h day of June 2013 Q. B~
Of Anand and Anand Advocates
Agent for the Applicant