YARN WINDING MACHINE AND WINDING METHOD
BACKGROUND OF THE INVENTION
1. Field of the Invention
5 This invention relates to a yarn winding machine
adapted to wind a yarn while traversing to form a conical
package.
2. Description of the Related Art
10 Conventionally, in a yarn winding machine adaptedto
wind a conical package, a control is carried out such that
atraverse speed in a larger-diameter region ofthe package
becomes smallerthan atraverse speedina smaller-diameter
region. According to sucha control, a shape ofthe package
15 is appropriately formed, and a winding density of the
larger-diameter region is increased to realize a
satisfactory unwinding property of the package. In the
following description, a ratio ofthe traverse speed in the
smaller-diameter region to the traverse speed in the
20 larger-diameter region is referred to as a traverse speed
ratio. German Patent Application Publication No.
102008015907 and Japanese Unexamined Patent PublicationNo.
2012-017205 disclose a yarn winding machine in which the
traverse speed ratio can be set.
25 German Patent Application Publication No.
102008015907 discloses atechniqueofreducingthetraverse
speed ratio according to a progress of a winding stage.
Japanese Unexamined Patent Publication No. 2012-017205
discloses a technique of adjustinga speedprofile for each
30 of the smaller-diameter region and the larger-diameter
region when the traverse speed ratio (lead ratio) is set.
The s p e e d p r o f i l e is informationincludingatraversetime,
a t r a v e r s e speed, a n a c c e l e r a t i o n t i m e o f t h e t r a v e r s e guide,
an a c c e l e r a t i o n of t h e t r a v e r s e guide, and t h e l i k e .
5 BRIEF SUMMARY OF THE INVENTION
When forming a c o n i c a l package, a phenomenon (bulge
winding) inwhichanendfaceofthepackagebulgesmayoccur
p a r t i c u l a r l y on a s m a l l e r - d i a m e t e r s i d e . This phenomenon
occurs when a y a r n l a y e r of an i n t e r m e d i a t e p o r t i o n of t h e
10 package is compressed by a t i g h t e n i n g f o r c e of t h e yarn on
an o u t e r diameter s i d e and a r e p u l s i o n f o r c e from a winding
t u b e , t h u s p r o t r u d i n g out from t h e end f a c e of t h e package.
The occurrence of t h e bulge winding may not b e p r e v e n t e d
by merely s e t t i n g t h e g r a d u a l l y lowering o r c o n s t a n t
15 t r a v e r s e speed r a t i o a s i n t h e conventional a r t .
I n p a r t i c u l a r , when forming a package having high
winding d e n s i t y o r when forming a package by winding a yarn
of t h i c k yarn count (i.e . , when t e n s i o n becomes high) , t h e
bulge winding t e n d s t o e a s i l y occur.
20 Conventionally, i n o r d e r t o prevent t h e occurrence
of t h e bulge winding, a c o n t r o l of a d j u s t i n g a t r a v e r s e
width o r a c o n t r o l of a d j u s t i n g a t r a v e r s e angle is c a r r i e d
o u t . However, i n such a c o n t r o l , s e t t i n g t e n d s t o become
complex. Furthermore, i n t h e c o n t r o l d e s c r i b e d above, t h e
25 t r a v e r s e width and/or t h e t r a v e r s e angle a r e a d j u s t e d
exceeding a n a p p r o p r i a t e amount t o s u p p r e s s t h e occurrence
of t h e bulge winding. As a r e s u l t , problems such a s a
package s i z e becoming l a r g e and t h u s becoming d i f f i c u l t t o
handle and t h e l i k e a r i s e .
30 It i s an o b j e c t of t h e p r e s e n t i n v e n t i o n t o provide
a yarn winding machine capable of s u p p r e s s i n g a n i n c r e a s e
in a package size while preventing occurrence of bulge
winding with a simple setting.
A yarn winding machine comprises a traverse guide
adapted to traverse a yarn to be wound around a conical
5 package; and a control section adapted to control at least
a traverse speed of the traverse guide, and to increase a
traverse speed ratio when a winding stage progresses, the
traverse speed ratio being a ratio of a traverse speed of
a traverse guide in a smaller-diameter region to a traverse
10 speed of the traverse guide in a larger-diameter region.
stage.
A winding method comprises an acquiring step of
acquiring a yarn layer thickness or a package diameter of
a package; a calculating step of obtaining atraverse speed
15 ratio in accordance with the yarn layer thickness or the
package diameter acquired in the acquiring step, the
traverse speed ratio being a ratio of a traverse speed of
atraverse guide in a smaller-diameter region to atraverse
speed of the traverse guide in a larger-diameter region,
20 the traverse guide being adapted to traverse a yarn to be
woundaround the package; and a control step of controlling
the traverse guide by the traverse speed ratio obtained in
the calculating step.
2 5 BRIEF DESCRIPTION OF THE DRAWINGS
FIG. lisa front viewof anautomaticwinder according
to one embodiment of the present invention;
FIG. 2 is a front view and a block diagram of a yarn
winding unit;
3 0 FIG. 3A is a flowchart illustrating a process of
changing a traverse speed ratio;
FIG. 3B is an equation for calculating a target
traverse speed ratio;
FIG. 4Ais atable illustrating setting items of when
changing the traverse speed ratio;
5 FIG. 4B is a graph illustrating a change in the
traverse speed ratio accompanying an increase in a yarn
layer thickness;
FIG. 5 is a schematic front view of a winding section
for describing a traverse angle;
10 FIG. 6 is a graph illustrating a set example of the
traverse angle;
FIG. 7 is a view describing a control for changing
a traverse width; and
FIGS. 8A and 8B are graphs illustrating a change in
15 the traverse speed ratio accompanying an increase in a yarn
layer thickness according to an alternative embodiment.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Next, embodiments of the present invention will be
20 described with reference to the drawings. In the present
specification, "upstream" and "downstream" respectively
refer to upstream and downstream in atravelling direction
of a yarn at the time of yarn winding.
As illustrated in FIG. 1, an automatic winder (yarn
25 winding machine) 1 includes a plurality of yarn winding
units10 arrangedin line, adoffingdevice 60, andamachine
control device 90.
Each yarn winding unit 10 is adapted to wind a yarn
20 unwound from a yarn supplying bobbin 21 around a conical
30 winding tube 22 supported by a cradle 23 while traversing
the yarn 20 to form a package 30. The cradle 23 includes
a smaller-diameter supporting section adaptedto rotatably
support a smaller-diameter end of the winding tube 22 and
a larger-diameter supporting section adapted to rotatably
support a larger-diameter end of the winding tube 22.
5 Whenthepackage30is fullywoundineachyarnwinding
unit 10, the doffing device 60 travels to a position of the
relevant yarn winding unit 10. In the yarn winding unit
10, the doffing device 60 removes the fully-wound package
30 from the cradle 23 and supplies a winding tube 22 (empty
10 bobbin) around which the yarn 20 is not wound.
The machine control device 90 includes a machine
setting section (setting section) 91 and a machine display
section 92. The machine setting section 91 enables an
operator to input a predetermined set value or select an
15 appropriate control method to carry out setting with
respect to each yarn winding unit 10. The machine display
section 92 can display winding status of the yarn 20 in each
yarn winding unit 10, content oftrouble that occurred, and
the like.
20 Next, with reference to FIG. 2, a description will
be specificallymade on a configuration ofthe yarn winding
unit 10.
Each of the yarn winding units 10 includes a winding
unit main body 17 and a unit control section 51.
25 The unit control section 51 includes, for example,
a Central Processing Unit (CPU), a Random Access Memory
(RAM), a Read Only Memory (ROM) , an Input-and-Output (I/O)
port, and a communication port. The ROM stores a program
forcontrollingeachcomponentofthewindingunitmainbody
30 17. Each component of the winding unit main body 17 and
the machine control device 90 are connected to the 1/0 port
and the communication port, thus enabling communication of
the control information and the like. The unit control
section 51thus can control the operation of each component
of the winding unit main body 17.
5 The winding unit main body 17 includes a yarn
unwinding assisting device 12, a tension applying device
13, a yarn joining device 14, a yarn lengthdetecting sensor
15, a clearer 16, and a winding section 18 arranged in this
order fromthe yarn supplyingbobbin 21on a yarn travelling
10 path between the yarn supplying bobbin 21 and a contact
roller 29.
The yarn unwinding assisting device 12 assists
unwinding of the yarn 20 from the yarn supplying bobbin 21
by lowering a regulation member 40 covering a core tube of
15 the yarn supplying bobbin 21 accompanying the unwinding of
the yarn 20 from the yarn supplying bobbin 21. The
regulationmember 40 is brought into contact with a balloon
formed at an upper part of the yarn supplying bobbin 21 by
rotationanda centrifugal force ofthe yarn 20 unwound from
20 the yarn supplying bobbin 21 to control the balloon to an
appropriate size, thus assisting the unwinding of the yarn
20. A sensor (not illustrated) for detecting a chase
portion of the yarn supplying bobbin 21 is arranged in
proximity to the regulation member 40. When this sensor
25 detects lowering of the chase portion, the regulation
member 40 is lowered by an air cylinder (not illustrated),
for example.
The tension applying device 13 applies a
predetermined tension on the travelling yarn 20. The
30 tension applying device 13 may be a gate-type tension
applying device in which movable comb teeth are arranged
with r e s p e c t t o f i x e d comb t e e t h . The movable comb t e e t h
a r e swungbya rotarysolenoidsothatthemovable combteeth
a r e engaged with o r r e l e a s e d from t h e f i x e d comb t e e t h . A
d i s c - t y p e t e n s i o n a p p l y i n g d e v i c e , f o r example, may be
5 adopted i n s t e a d of t h e g a t e - t y p e t e n s i o n applying d e v i c e
13 d e s c r i b e d above.
The yarn j o i n i n g device 1 4 j o i n s a lower yarn from
t h e yarn s u p p l y i n g bobbin 21 and an upper yarn from t h e
package 30 a f t e r t h e c l e a r e r 16 d e t e c t s a yarn d e f e c t and
10 c u t s t h e yarn 20, a f t e r yarn breakage during unwinding of
t h e yarn 20 f r o m t h e yarn s u p p l y i n g b o b b i n 21, a n d t h e l i k e .
The yarn j o i n i n g device 1 4 may be a mechanical-type o r a
type t h a t uses f l u i d such a s compressed a i r .
The yarn l e n g t h d e t e c t i n g s e n s o r 15 d e t e c t s a yarn
15 l e n g t h of t h e yarn 20 wound i n t o t h e package 30 i n a
non-contacting manner. The yarn l e n g t h d e t e c t i n g s e n s o r
1 5 d e t e c t s a n a m o u n t o f h a i r i n e s s o f t h e y a r n 2 0 t o c a l c u l a t e
a m o v e m e n t a m o u n t o f t h e y a r n 2 0 , a n d d e t e c t s t h e y a r n l e n g t h .
S p e c i f i c a l l y , t h e yarn l e n g t h d e t e c t i n g sensor 15 i n c l u d e s
20 a p l u r a l i t y of o p t i c a l h a i r i n e s s d e t e c t i n g s e c t i o n s , each
having a l i g h - t r e c e i v i n g element and a l i g h t s o u r c e ,
a r r a n g e d a l o n g a yarn t r a v e l l i n g d i r e c t i o n . The yarn
l e n g t h d e t e c t i n g s e n s o r 15 d e t e c t s a t r a v e l l e d l e n g t h of
t h e yarn 20 i n accordance with a change i n an output s i g n a l
25 of t h e p l u r a l i t y of h a i r i n e s s d e t e c t i n g s e c t i o n s l o c a t e d
a t d i f f e r e n t p o s i t i o n s i n t h e yarn t r a v e l l i n g d i r e c t i o n .
The u n i t c o n t r o l s e c t i o n ( a c q u i r i n g s e c t i o n ) 5 1 c a n
o b t a i n a yarn l a y e r t h i c k n e s s of t h e package 30 using t h e
t r a v e l l e d l e n g t h of t h e yarn 20 d e t e c t e d by t h e yarn l e n g t h
30 d e t e c t i n g s e n s o r 15. S p e c i f i c a l l y , t h e u n i t c o n t r o l
s e c t i o n 51 can c a l c u l a t e t h e t r a v e r s e angle i n accordance
with the yarn travelling speed calculated from the
travelled length detected by the yarn length detecting
sensor15, andthetraverse speed. Theunit control section
51 then calculates a package diameter in accordance with
5 the traverse angle, a peripheral speed of the package 30,
and a number of rotations of the package 30. The unit
control section 51 can obtain the yarn layer thickness by
subtracting a diameter of the winding tube 22 from the
package diameter.
10 The clearer 16 includes a clearer head 49 provided
with a sensor (not illustrated) for detecting a thickness
of the yarn 20, and an analyzer 52 for processing a yarn
thickness signal from the sensor. The clearer 16 detects
a yarn defect such as slub by monitoring the yarn thickness
15 signal from the sensor. A cutter (not illustrated) is
provided in proximity to the clearer head 49, and
immediately cuts the yarn 20 when the clearer 16 detects
the yarn defect.
A lower yarn catching member 25 adapted to catch a
20 yarn end of the lower yarn from the yarn supplying bobbin
21 and guide the yarn end to the yarn joining device 14 is
arranged below the yarn joining device 14. The lower yarn
catching member 25 includes a lower yarn pipe arm 33, and
a lower yarn suction mouth 32 formed at a distal end of the
25 lower yarn pipe arm 33.
An upper yarn catching member 26 adapted to catch a
yarn end of the upper yarn from the package 30 and guide
the yarn end tothe yarn joining device 14 is arrangedabove
the yarn joining device 14. The upper yarn catching member
30 26 includes an upper yarn pipe arm 36, and an upper yarn
suction mouth 35 formed at a distal end of the upper yarn
p i p e arm 36.
The lower yarn pipe arm 33 and t h e upper yarn pipe
arm 36 can r e s p e c t i v e l y swing with s h a f t s 34 and 37 a s a
c e n t e r . An a p p r o p r i a t e n e g a t i v e p r e s s u r e source ( n o t
5 i l l u s t r a t e d ) is connected t o t h e lower yarn p i p e arm 33 and
t h e upper yarn p i p e arm 36. Thus, a s u c t i o n a i r flow can
b e g e n e r a t e d a t t h e l o w e r y a r n s u c t i o n m o u t h 3 2 a n d t h e u p p e r
yarn s u c t i o n mouth 35, and t h e yarn ends of t h e upper yarn
and t h e lower yarn can be sucked and caught by t h e lower
10 yarn p i p e arm 33 and t h e upper yarn p i p e arm 36,
r e s p e c t i v e l y .
Thewinding s e c t i o n 1 8 i n c l u d e s t h e c r a d l e 23 adapted
t o r e m o v a b l y s u p p o r t t h e w i n d i n g t u b e 2 2 , t h e c o n t a c t r o l l e r
29 a d a p t e d t o r o t a t e w h e n b r o u g h t i n t o c o n t a c t w i t h a n o u t e r
15 p e r i p h e r a l s u r f a c e of t h e winding tube 22 o r an o u t e r
p e r i p h e r a l s u r f a c e of t h e package 30, a t r a v e r s e arm
( t r a v e r s e g u i d e ) 71, and a t r a v e r s e d r i v i n g motor 72.
The c r a d l e 23 can swing with a swing s h a f t 48 a s t h e
c e n t e r . Anincreaseinayarnlayerthickness accompanying
20 t h e winding of t h e yarn 20 around t h e winding tube 22 can
be absorbed by t h e swinging of t h e c r a d l e 23.
A package d r i v i n g motor 4 1 is a t t a c h e d t o t h e c r a d l e
23. The winding t u b e 22 is r o t a t i o n a l l y d r i v e n by t h e
package d r i v i n g motor 4 1 t o wind t h e yarn 20 around t h e
25 w i n d i n g t u b e 2 2 . Amotor shaftofthepackagedrivingmotor
4 1 i s c o u p l e d w i t h t h e w i n d i n g t u b e 22 so a s t o b e r e l a t i v e l y
n o n - r o t a t a b l e when t h e winding tube 22 is supported by t h e
c r a d l e 23 ( s o - c a l l e d d i r e c t d r i v e t y p e ) . An o p e r a t i o n of
t h e package d r i v i n g motor 4 1 is c o n t r o l l e d by a package
30 d r i v e c o n t r o l s e c t i o n 42. The package d r i v e c o n t r o l
s e c t i o n 42 a d j u s t s a r o t a t i o n s p e e d o f t h e package d r i v i n g
motor 41 (or acceleration thereof) upon receiving an
instruction from the unit control section 51.
The traverse arm 71 traverses the yarn 20 while
guiding the yarn 20. The traverse arm 71 is driven by the
5 traverse drivingmotor 72. Specifically, the traverse arm
71 is arranged to continuously reciprocate accompanying
forward/reverse rotation of a rotor ofthe traverse driving
motor 72. An operation of the traverse driving motor 72
is controlled by the unit control section 51 through a
10 traverse drive control section 73. A hook-shaped yarn
guide section, for example, is formed at a distal end of
the traverse arm 71. The traverse arm 71 is reciprocated
with the yarn 20 held (guided) by the yarn guide section,
and the yarn 20 is traversed. A guide plate 28 is arranged
15 slightly upstream of a traverse area. The guide plate 28
guides the yarn 20 located upstream to the traverse area.
Next, with reference to FIG. 3A to FIG. 4B, a
description will be made on a control of changing the
traverse speed ratio in accordance with the increase in the
20 yarn layer thickness by the unit control section 51. The
traverse speed ratio is a ratio of the traverse speed in
the smaller-diameter region to the traverse speed in the
larger-diameter region. A traverse time of the
larger-diameter region to a traverse time in the
25 smaller-diameter region of the package also indicates the
same value, and thus such a value also corresponds to the
traverse speed ratio.
First, a description will be made on contents of the
present control. As illustrated in FIG. 4B, the present
30 control gradually increases the traverse speed ratio from
a startofa winding operation to apredeterminedtimepoint.
After passing the predeterminedtime point (switching yarn
layer thickness), the traverse speed ratio is maintained
constant.
As described in German Patent Application
5 Publication No. 102008015907 and Japanese Unexamined
Patent Publication No. 2012-017205, the traverse speed
ratio is constant or is gradually reduced in the
conventional art, and hence the winding density of the
smaller-diameter region is greatly increased accompanying
10 the increase in the yarn layer thickness (initial winding
density and winding density of the yarn layer in the
intermediate portion are low). As a result, the bulge
winding occurred. On the other hand, the traverse speed
ratio is graduallyincreasedinthepresent embodiment, and
15 thus the increase in the winding density of the
smaller-diameter region accompanying the increase in the
yarn layer thickness can be suppressed (or can be made
constant or smaller). Therefore, the occurrence of the
bulge winding can be prevented.
20 When carrying out the present control, the operator
sets a startingtraverse speed ratio, a final traverse speed
ratio, and a switching yarn layer thickness with respect
to the mac'hine setting section 91 before starting the
winding operation (see FIG. 4A). The starting traverse
25 speed ratio is the traverse speed ratio applied at a start
of winding of the package 30. If the starting traverse
speed ratio is small, the occurrence of the bulge winding
can be easily prevented, but stitching on the
larger-diameter side tend sto easilyoccur. Therefore, in
30 view of the above, a value of the starting traverse speed
ratio needs to be defined. The final traverse speed ratio
i s a n u p p e r l i m i t o f t h e t r a v e r s e speed r a t i o t o b e a p p l i e d .
The s w i t c h i n g yarn l a y e r t h i c k n e s s ( s w i t c h i n g t h r e s h o l d )
i s a v a l u e ( y a r n l a y e r t h i c k n e s s ) d e f i n i n g a timing t o
switch t o t h e f i n a l t r a v e r s e speed r a t i o . The machine
5 c o n t r o l device 9 0 t r a n s m i t s t h e i n s t r u c t i o n o f t h e o p e r a t o r
t o t h e u n i t c o n t r o l s e c t i o n 51 o f e a c h yarn winding u n i t
10. T h e u n i t c o n t r o l s e c t i o n 5 1 a c c e p t s s e t v a l u e s r e c e i v e d
from t h e machine c o n t r o l device 90 ( s t e p S101).
T h e r e a f t e r , winding o f t h e package 30 is s t a r t e d , and
10 t h e u n i t c o n t r o l s e c t i o n 51 c o n t r o l s t h e t r a v e r s e d r i v i n g
motor 72 so t h a t t h e t r a v e r s e arm 71 t r a v e r s e s t h e yarn 20
by t h e s t a r t i n g t r a v e r s e speed r a t i o . T h e r e a f t e r , when
d e t e r m i n i n g t h a t t h e package 30 i s beingwound ( s t e p S102),
t h e u n i t c o n t r o l s e c t i o n 51 determines whether o r not t h e
15 c u r r e n t yarn l a y e r t h i c k n e s s i s s m a l l e r t h a n t h e s w i t c h i n g
yarn l a y e r t h i c k n e s s ( s t e p S103) . The c u r r e n t yarn l a y e r
t h i c k n e s s can be c a l c u l a t e d ( a c q u i r e d ) i n accordance with
a d e t e c t i o n r e s u l t of t h e yarn l e n g t h d e t e c t i n g sensor 15
a s d e s c r i b e d above.
2 0 When d e t e r m i n i n g t h a t t h e c u r r e n t yarn l a y e r
t h i c k n e s s is s m a l l e r than t h e s w i t c h i n g yarn l a y e r
t h i c k n e s s , t h e u n i t c o n t r o l s e c t i o n 51 c a l c u l a t e s a t a r g e t
t r a v e r s e speed r a t i o ( s t e p S104). The t a r g e t t r a v e r s e
speed r a t i o i s calculatedusingequationillustratedin FIG.
25 3B. I n t h e p r e s e n t embodiment, s i n c e t h e t a r g e t t r a v e r s e
speed r a t i o is l i n e a r , a s l o p e c a n b e c a l c u l a t e d b y d i v i d i n g
a v a l u e o b t a i n e d b y s u b t r a c t i n g t h e s t a r t i n g t r a v e r s e speed
r a t i o from t h e f i n a l t r a v e r s e speed r a t i o by t h e switching
yarn l a y e r t h i c k n e s s . The t a r g e t t r a v e r s e speed r a t i o can
30 be c a l c u l a t e d by m u l t i p l y i n g t h e c u r r e n t yarn l a y e r
t h i c k n e s s t o t h e s l o p e , and then adding t h e s t a r t i n g
traverse speed ratio, which is an initial value, thereto.
The unit control section 51 controls the traverse
driving motor 72 so that the traverse arm 71 traverses the
yarn 20 by the target traverse speed ratio calculated in
5 the above manner (step S105). Then, the unit control
section 51 again carries out a process of step S102. When
the unit control section 51 again calculates the target
traverse speed ratio, the target traverse speed ratio is
increased since the current yarn layer thickness is
10 increased. The unit control section 51 thus carries out
the control of gradually increasing the traverse speed
ratio in accordance with the increase in the yarn layer
thickness.
Thereafter, whenthewinding stage progresses andthe
15 current yarn layer thickness becomes greater than or equal
to the switching yarn layer thickness (when determined as
No in step S103), the unit control section 51 controls the
traverse driving motor 72, assuming that the target
traverse speedratio is the final traverse speedratio (step
20 S106), and the traverse arm71traversesthe yarn 20 by such
a traverse speed ratio (step S105). The unit control
section 51 terminates the control of gradually increasing
the traverse speed ratio in accordance with the increase
in the yarn layer thickness, and proceeds to the control
25 of operating the traverse arm 71 by the constant traverse
speed ratio.
The unit control section 51 carries out the process
of controlling the traverse driving motor 72 so that the
traverse arm 71 traverses the yarn 20 by the final traverse
30 speed ratio until the termination of the winding of the
package 30 (until determined as No in step S102).
Thus, the yarn winding unit 10 can carry out the
control of changing the traverse speed ratio by having the
operator simply set three setting items. Therefore, the
occurrence of the bulge winding can be prevented with a
5 simple process. In particular, in the present embodiment,
since the traverse speedratiois changedinaccordancewith
the yarn layer thickness, which does not depend on a
position in a winding width direction, the measurement can
be easily and accurately carried out. Therefore, the
10 traverse speed ratio can be controlled with high accuracy.
The occurrence of the bulge winding can be prevented
by simply changing the traverse speed ratio in the above
manner. However, when forming the package 30 of high
winding density, or when forming the package 30 with the
15 yarn 20 of thick yarn count, the bulge winding tends to
easily occur. Therefore, to reliably prevent the
occurrence ofthe bulge winding, a control of adjustingthe
traverse angle and/or a control of adjusting the traverse
width may be simultaneously carried out in addition to the
20 control of changing the traverse speed ratio.
The control of adjusting the traverse angle will be
described with reference to F I G . 5 and F I G . 6. As
illustrated in F I G . 5, a traverse angle @ is an inclined
angle of the yarn 20 on the package 30 with respect to a
25 perpendicular line of an axis of the winding tube 22. The
process can be carried out assuming an intersecting angle
of the yarn 20 and the yarn 20 as the traverse angle.
Although a method for setting the traverse angle is
arbitrary, for example, there is a method of associating
30 the yarn layer thickness and the traverse angle and
specifying a few points (black circle of FIG. 6), and
connecting a plurality of the specified points. As
described above, the bulge winding is a phenomenon in which
the yarn layer at the intermediate portion bulges out from
the end face of the package 30 upon receiving pressure from
5 an outer yarn layer, and thus the occurrence of the bulge
winding can be prevented by increasing the traverse angle
at a portion corresponding to the yarn layer of the
intermediate portion.
Next, a description will be made on the control of
10 adjusting the traverse width with reference to FIG. 7.
Although the method for setting a correction width
(correction length) ofthe traverse width is arbitrary, for
example, there is a method of associating the yarn layer
thickness and the correction width and specifying a few
15 points (blackcircle of FIG. 7), andconnectingaplurality
of the specified points. The occurrence of the bulge
winding canbepreventedbyincreasingthe correctionwidth
at the portion corresponding to the yarn layer of the
intermediate portion.
20 For the setting of the correction width of the
traverse width, different values can be set for the
smaller-diameter side and the larger-diameter side as
illustrated in FIG. 7. Since the bulge winding tends to
easily occur on the smaller-diameter side, the occurrence
25 of the bulge winding can be more reliably prevented by
making the correction width of the smaller-diameter side
to be greater than that of the larger-diameter side.
As described above, the automatic winder 1 of the
p r e s e n t e m b o d i m e n t i n c l u d e s t h e t r a v e r s e a r m 7 1 a n d t h e u n i t
30 control section 51. The traverse arm 71traversesthe yarn
20 wound around the conical package 30. The unit control
section 51 increases the traverse speed ratio when the
winding stage progresses.
In the control of adjusting the traverse width or the
traverse angle of the conventional art, the winding width
5 (traverse width) is directlyreducedorthewindingdensity
is reduced. In the control of the present embodiment, the
balance between the winding densities of the
smaller-diameter region and the larger-diameter region is
merely changed. Therefore, the increase in the package
10 size canbe suppressed. Furthermore, the occurrence ofthe
bulge winding can be prevented with a simple process
compared to the conventional control.
The automatic winder 1 of the present embodiment
includes the machine setting section 91 adapted to set the
15 starting traverse speed ratio, the final traverse speed
ratio, and the switching threshold.
Thus, since the setting is simple compared to the
controlofchangingthetraversewidthorthetraverse angle,
the trouble of the operator can be reduced.
2 0 Next, a description will be made on alternative
embodiments of the above-described embodiment with
reference to FIGS. 8A and 8B.
In the embodiment described above, there is applied
apatternof continuouslychangingthetraverse speed ratio
25 in accordance with the yarn layer thickness, and thereafter,
making the traverse speed ratio constant. However, an
arbitrary pattern can be used as long as the traverse speed
ratio is increased by the increase in the yarn layer
thickness.
30 For example, as illustrated in FIG. 8A, the traverse
speed ratio may be changed in a step wise manner. In this
case, the unit control section 51 increases the traverse
speed ratio by one stage when the yarn layer thickness
becomes greaterthan or equal to a predetermined reference
value. In this case, the target traverse speed ratio does
5 not need to be always calculated, and thus the processing
amount of the unit control section 51 can be suppressed.
As illustrated in FIG. 8B, the traverse speed ratio
may be continuously changed without providing a region
where the traverse speed ratio becomes constant. A
10 changingmodeofthetraverse speedratio is alsoarbitrary,
and is not limited to the mode of changing linearly or in
a step wise manner, and may be changed in a curved line.
Preferredembodiments andalternativeembodimentsof
the present invention have been described above, but the
15 above-described configurations may be modified as below.
In the embodiment described above, the control of
changingthetraverse speed ratio is carried out by the unit
control section 51, but the control may be partially or
entirely carried out by the machine control device 90 or
20 the traverse drive control section 73.
The traverse guide is not limited to the arm-type
traverse guide as in the embodiment described above, and
may be a belt-type traverse guide, for example.
Instead of directly driving and rotatingthe package
25 30 by the package driving motor 41, the package 30 may be
rotatedaccompanyingthe rotation ofthe contact roller29.
For the configuration of obtaining the yarn layer
thickness of the package 30, an angle sensor for detecting
an angle ofthe cradle 23 (swing angle about the swing shaft
30 48) maybeused. The angle sensor includes a rotaryencoder,
for example, and transmits an angle signal corresponding
to the angle of the cradle 23 to the unit control section
51. Since the angle ofthe cradle 23 changes as thewinding
operation of the package 30 progresses, the package
diameter can be detected by detecting the angle with the
5 angle sensor. The yarn layer thickness of the package 30
canbe calculatedbysubtractingthediameterofthewinding
tube 22 from the package diameter. For the method for
detecting the yarn layer thickness, an appropriate
configuration other than the angle sensor such as an analog
10 sensor, an absolute-type sensor, and the like may be used.
As a configuration for obtaining the yarn layer
thickness of the package 30, a timer capable of measuring
an elapsed time can be used. In this case, the time change
of the yarn layer thickness can be defined in advance
15 through calculation or an empirical value in accordance
with a winding condition. Then, the yarn layer thickness
is obtained in accordance with a defined value and a
measured elapsed time. The timer can measure the elapsed
timetakingintoconsiderationthetimeinwhichthewinding
20 has been interrupted by yarn cut or yarn breakage.
In the embodiment described above, the configuration
of changingthetraverse speed ratio in accordance with the
yarn layer thickness is adopted, but a configuration using
a reference other than the yarn layer thickness can be used
25 as long as the traverse speed ratio is changed according
to the winding stage. For example, the package diameter,
the length (yarn length) of the wound yarn 20, the winding
time, or the like can be used in place of the yarn layer
thickness. In this case, the switching threshold also
30 becomes the package diameter, the yarn length, or the
winding time instead of the yarn layer thickness.
In t h e d e s c r i p t i o n made above, t h e operator s e t s the
s t a r t i n g t r a v e r s e speed r a t i o , t h e f i n a l t r a v e r s e speed
r a t i o , and t h e switching yarn l a y e r t h i c k n e s s , but t h e
operator may s e t t h e slope, f o r example. The
5 correspondencerelationshipoftheyarnlayerthicknessand
t h e t r a v e r s e speed r a t i o may be s p e c i f i e d by a few p o i n t s ,
and a p l u r a l i t y of t h e s p e c i f i e d p o i n t s may be connected.
I n o t h e r words, a p l u r a l i t y of switching t r a v e r s e speed
r a t i o s may be providedbetweenthe s t a r t i n g t r a v e r s e speed
10 r a t i o and t h e f i n a l t r a v e r s e speed r a t i o .
The present invention is not l i m i t e d t o t h e automatic
winder, and can be applied t o o t h e r yarn winding machines
such as a rewinding machine, a f i n e spinning machine ( e . g. ,
a n a i r - j e t s p i n n i n g m a c h i n e , anopen-endspinningmachine),
15 and t h e l i k e .
According t o a f i r s t aspect o f t h e present invention,
a yarn winding machine i n c l u d e s a t r a v e r s e guide and a
c o n t r o l s e c t i o n . The t r a v e r s e guide i s a d a p t e d t o t r a v e r s e
a yarn t o be wound around a conical package. The c o n t r o l
20 s e c t i o n i s adapted t o c o n t r o l a t l e a s t a t r a v e r s e speed of
t h e t r a v e r s e guide. A r a t i o of a t r a v e r s e speed of the
t r a v e r s e guide i n a smaller-diameter region t o a t r a v e r s e
speed of t h e t r a v e r s e guide i n a l a r g e r - d i a m e t e r r e g i o n is
r e f e r r e d t o as a t r a v e r s e speed r a t i o . The c o n t r o l s e c t i o n
25 i n c r e a s e s t h e t r a v e r s e speed r a t i o when a winding stage
progresses.
In t h e c o n t r o l of a d j u s t i n g t h e t r a v e r s e width of the
conventional a r t , t h e t r a v e r s e width is d i r e c t l y reduced.
In the c o n t r o l of a d j u s t i n g t h e t r a v e r s e angle, t h e winding
30 d e n s i t y is lowered. In t h e c o n t r o l ' of t h e present
embodiment, balance between t h e winding d e n s i t i e s of the
smaller-diameter region and the larger-diameter region is
changed. Therefore, the increase in the package size can
be suppressed. Furthermore, the occurrence of the bulge
winding can be prevented with a simple process compared to
5 the conventional control.
In the yarn winding machine described above, the
control section preferably continuously increases the
traverse speed ratio according to progress of the winding
stage.
10 Thus, since an initial winding density of the
smaller-diameter region and a winding density of a yarn
layer in an intermediate portion can be made particularly
high, the occurrence ofthe bulge winding can be accurately
prevented.
15 In the yarn winding machine described above, the
control section preferably increases the traverse speed
ratio according to an increase in a yarn layer thickness
or a package diameter of the package.
Thus, since the traverse speed ratio is closely
20 relatedtothe yarn layer thickness or thepackagediameter,
the occurrence of the bulge winding can be appropriately
prevented.
The yarn windingmachine furtherpreferablyincludes
a setting section adapted to set a starting traverse speed
25 ratio, a final traverse speed ratio, and a switching
threshold. The starting traverse speed ratio is the
traverse speed ratio applied at start of winding of the
package. The final traverse speed ratio is an upper limit
of the traverse speed ratio to be applied. The switching
30 threshold defines a timing to switch to the final traverse
speed ratio.
Thus, s i n c e t h e s e t t i n g i s simple compared t o t h e
controlofchangingthetraversewidthorthetraverse a n g l e ,
t r o u b l e of t h e o p e r a t o r can be a l l e v i a t e d .
The yarn winding machine d e s c r i b e d above f u r t h e r
5 p r e f e r a b l y i n c l u d e s anacquiringsectionadaptedtoacquire
t h e yarn l a y e r t h i c k n e s s o r t h e package d i a m e t e r . The
c o n t r o l s e c t i o n is adapted t o c o n t r o l t h e t r a v e r s e guide
by a t a r g e t t r a v e r s e speed r a t i o when t h e yarn l a y e r
t h i c k n e s s orthepackagediameteracquiredbytheacquiring
10 s e c t i o n is s m a l l e r t h a n t h e s w i t c h i n g t h r e s h o l d , t h e t a r g e t
t r a v e r s e speed r a t i o being o b t a i n e d i n accordance with a t
l e a s t t h e s t a r t i n g t r a v e r s e speed r a t i o and t h e f i n a l
t r a v e r s e speed r a t i o .
Thus, s i n c e t h e winding d e n s i t y of t h e
15 s m a l l e r - d i a m e t e r r e g i o n atabeginningofthewinding s t a g e
can be i n c r e a s e d , t h e occurrence of t h e bulge winding can
be p r e v e n t e d .
In t h e yarn winding machine d e s c r i b e d above, t h e
c o n t r o l s e c t i o n p r e f e r a b l y c o n t r o l s t h e t r a v e r s e guide by
20 t h e f i n a l t r a v e r s e s p e e d r a t i o w h e n t h e yarn l a y e r t h i c k n e s s
o r t h e package diameter a c q u i r e d by t h e a c q u i r i n g s e c t i o n
is l a r g e r than t h e s w i t c h i n g t h r e s h o l d .
Thus, s i n c e t h e occurrence of t h e bulge winding can
be p r e v e n t e d without a d j u s t i n g t h e winding d e n s i t y of t h e
25 s m a l l e r - d i a m e t e r region when t h e winding s t a g e p r o g r e s s e s
t o a c e r t a i n e x t e n t , t h e winding d e n s i t y of t h e
smaller-diameterregioncanbepreventedfrombeingreduced
more than n e c e s s a r y .
In t h e yarn winding machine d e s c r i b e d above, t h e
30 c o n t r o l s e c t i o n p r e f e r a b l y changes t h e t r a v e r s e angle
a c c o r d i n g t o t h e winding s t a g e .
Thus, t h e occurrence of t h e bulge winding can be more
r e l i a b l y p r e v e n t e d .
In t h e yarn winding machine d e s c r i b e d above, t h e
c o n t r o l s e c t i o n p r e f e r a b l y changes a t r a v e r s e width o f t h e
5 t r a v e r s e guide a c c o r d i n g t o t h e winding s t a g e .
Thus, t h e occurrence of t h e bulge winding can be more
r e l i a b l y p r e v e n t e d .
According t o a s e c o n d a s p e c t o f t h e p r e s e n t i n v e n t i o n ,
a f o l l o w i n g winding method i s provided. In o t h e r words,
10 t h e winding method i n c l u d e s an a c q u i r i n g s t e p , a
c a l c u l a t i n g s t e p , a n d a c o n t r o l s t e p . I n t h e a c q u i r i n g s t e p ,
a yarn l a y e r t h i c k n e s s o r a package diameter of a package
is a c q u i r e d . I n t h e c a l c u l a t i n g s t e p , a t r a v e r s e speed
r a t i o i s o b t a i n e d i n accordance with t h e yarn l a y e r
15 t h i c k n e s s o r t h e package diameter a c q u i r e d i n t h e a c q u i r i n g
s t e p , t h e t r a v e r s e speed r a t i o being a r a t i o of a t r a v e r s e
s p e e d o f a t r a v e r s e guide i n a s m a l l e r - d i a m e t e r region t o
a t r a v e r s e speed o f t h e t r a v e r s e guide i n a l a r g e r - d i a m e t e r
r e g i o n . In t h e c o n t r o l s t e p , t h e t r a v e r s e guide i s
20 c o n t r o l l e d by t h e t r a v e r s e speed r a t i o o b t a i n e d i n t h e
c a l c u l a t i n g s t e p .
Thus, t h e i n c r e a s e i n t h e package s i z e can be
suppressed.
WE CLAIM:
1. A yarn winding machine comprising:
atraverseguideadaptedtotraverseayarntobewound
around a conical package; and
5 a control section adapted to control at least a
traverse speed of the traverse guide, and to increase a
traverse speed ratio when a winding stage progresses, the
traverse speed ratio being a ratio of a traverse speed of
atraverse guide in a smaller-diameter region to atraverse
10 speed of the traverse guide in a larger-diameter region.
2. The yarn winding machine according to claim 1,
wherein the control section is adapted to continuously
increase the traverse speed ratio according to progress in
15 the winding stage.
3 . The yarn winding machine according to claim 1 or
claim 2, wherein the control section is adaptedto increase
the traverse speed ratio according to an increase in a yarn
20 layer thickness or a package diameter of the package.
4. The yarn winding machine according to claim 3,
further comprising a setting section adapted to set a
startingtraverse speed ratio, a final traverse speed ratio,
25 and a switching threshold, the starting traverse speed
ratio being the traverse speed ratio applied at start of
windingofthepackage, the final traverse speedratiobeing
an upper limit of the traverse speed ratio to be applied,
and the switching threshold being provided to define a
30 timing to switch to the final traverse speed ratio.
5. The yarn winding machine according to claim 4,
further comprising an acquiring section adaptedto acquire
the yarn layer thickness or the package diameter,
wherein the control section is adaptedto control the
5 traverse guide by a target traverse speed ratio when the
yarn layer thickness or the package diameter acquired by
the acquiring section is smaller than the switching
threshold, the target traverse speed ratio being obtained
in accordance with at least the starting traverse speed
10 ratio and the final traverse speed ratio.
6. The yarn winding machine according to claim 5,
wherein the control section is adapted to control the
traverse guide by the final traverse speed ratio when the
15 yarn layer thickness or the package diameter acquired by
the acquiring section is larger than the switching
threshold.
7. The yarn winding machine according to any one of
20 claim 1 through claim 6, wherein the control section is
adaptedto change a traverse angle according tothe winding
stage.
8. The yarn winding machine according to any one of
25 claim 1 through claim 7, wherein the control section is
adapted to change a traverse width of the traverse guide
according to the winding stage.
9. A winding method comprising:
an acquiring step of acquiring a yarn layer thickness
or a package diameter of a package;
a calculating step of obtaining a traverse speed
ratio in accordance with the yarn layer thickness or the
package diameter acquired in the acquiring step, the
traverse speed ratio being a ratio of a traverse speed of
5 atraverse guide in a smaller-diameter region to atraverse
speed of the traverse guide in a larger-diameter region,
the traverse guide being adapted to traverse a yarn to be
wound around the package; and
a control step of controlling the traverse guide by
10 the traverse speed ratio obtained in the calculating step.