Field of the Invention
[0001] The present invention relates to a yarn winding method for a take-up winder and a
take-up winder, and in particular, to a yarn winding method for a take-up winder and
a take-up winder wherein a traverse device makes a continuously supplied yarn traverse,
and a contact roller contacts a bobbin switched by a turret to a winding position
and the rotating roller causes the bobbin to wind the yarn around the bobbin as a
yarn package and the take-up winder is adapted to prevent the edge shape of the yarn
layers of the package from becoming a "saddle bag shape".
Background of the Invention
[0002] Conventionally, a turret type take-up winder may use a traverse device to make a
continuously supplied yarn traverse, and the turret is rotated to switch the two bobbin
holders attached to the turret between a winding position and a standby position,
and a contact roller contacts a bobbin at the winding position to wind the yarn supplied
and traversed around the bobbin.
[0003] In such a take-up winder wherein a traverse device makes a continuously supplied
yarn traverse while winding it around a bobbin to form packages, the edge shape of
yarn layers of the packages may become the saddle bag shape, thereby preventing good
yarn packages from being obtained.
[0004] The present invention is provided in view of this problem in the conventional technique.
Accordingly, the object of the present invention is to provide a winding method and
a take-up winder that varies the winding width in the axial direction of a bobbin
in order to prevent suddle bag shape from being formed.
Summary of the Invention
[0005] To achieve this object, the present invention provides a winding method for a take-up
winder wherein a traverse device makes a continuously supplied yarn traverse and a
contact roller contacts a bobbin, and the yarn is wound around the bobbin, wherein:
the bobbin and the contact roller which contacts the bobbin, repeatedly contact each
other and separate during winding.
[0006] Furthermore, the present invention provides a winding method for a take-up winder
wherein the time during which the bobbin and the contact roller contact each other
is longer than the time during which they are mutually separated.
[0007] In addition, the present invention provides a take-up winder wherein drive motors
are provided for each bobbin holder holding the bobbin and the contact roller, and
a rotation speed detection means is provided to detect the rotation speed of the bobbin
holder, and in addition, a control means is provided to control the rotation speed
of the bobbin holder based on the value detected by the rotation speed detection means.
[0008] Moreover, the present invention provides a take-up winder wherein the rotation speed
of the bobbin holder immediately before the bobbin leaves the contact roller is input
and wherein after the bobbin leaves the contact roller, the rotation speed of the
bobbin holder is reduced over time based on the input rotation speed.
Brief Description of the Drawing
[0009]
Figure 1 is a schematic front view showing an example of a basic configuration of
a winding method for a take-up winder according to the present invention, and showing
a state at the end of winding in which yarn has been wound around a bobbin located
at a winding position and a control block circuit.
Figure 2 is a schematic side view showing the take-up winder as seen from the side.
Figure 3 shows a specific example of a configuration for varying the free length L
in a winding method for a take-up winder according to the present invention. Figure
3A is a schematic front view showing the integral part in which a contact roller is
contacting a bobbin. Figure 3B is a front view of the integral part in which a long
free length L (a smaller winding width) is obtained by rotating a turret plate supporting
the bobbin, through an angle of θ° counterclockwise to mutually separate the bobbin
and the roller.
Figure 4 shows a specific example of a configuration for varying the free length L
in the winding method for a take-up winder according to the present invention. Figure
4A is a schematic front view showing the integral part in which the contact roller
is contacting the bobbin. Figure 4B is a front view of the integral part in which
a long free length L (a smaller winding width) is obtained by elevating an elevating
box that supports the contact roller to mutually separate the bobbin and the contact
roller.
Figure 5 is a schematic explanatory drawing for the winding method for a take-up winder
according to the present invention. Figure 5 is figure for explaning a principle how
the winding width increases with decreasing free length and decreases with increasing
free length, and also is a summary principle explanation figure which shows the state
of the yarn path established when a yarn is wound at a winding angle θ.
Figure 6 is a graph showing an example of the pattern of changes in free length based
on the relationship between the free length and the winding diameter (winding duration).
Detailed Description of the Preferred Embodiments
[0010] A take-up winder and a winding method for a take-up winder according to the present
invention will be described below in detail based on specific examples shown in the
drawings.
[0011] Figure 1 is a schematic front view showing a specific embodiment of a take-up winder
according to the present invention. The figure shows a state at the end winding in
which a yarn has been wound around a bobbin at a winding position in the take-up winder.
Figure 2 is a schematic side view showing the take-up winder as seen from the side.
[0012] First, the basic structure of a take-up winder U according to the present invention
will be described with reference to Figures 1 and 2.
[0013] In Figure 1, the take-up winder U has a body frame 7 and an elevating box 1 that
can ascend and descend, a rotatable turret plate 2 and a fixed frame 8 having an operation
panel 9 at its front surface end are provided in the body frame 7.
[0014] A contact roller 3 and a traverse device 4 are supported in the elevating box 1.
The contact roller 3 applies pressure against the surface layer of yarn on a bobbin
B at a winding position P1, and a driving source 10 comprising a motor M3, as shown
in Figures 1 and 2, drives the contact roller 3 so that the bobbin around which a
yarn is being wound rotates counterclockwise.
[0015] In addition, a traverse device 4 has a traverse guide 5 so that the guide 5 engages
a yarn Y to travel through the traversing range for performing traverse.
[0016] A rotational driving apparatus (not shown in the drawings) can rotate the turret
plate 2 around a rotating shaft 6. A first bobbin holder 11 and a second bobbin holder
12 are mounted on the turret plate 2 in such a way as to protrude therefrom. A plurality
of (in Figure 1, six) bobbins are installed on each of the bobbin holders 11 and 12.
One 11 of the bobbin holders 11, 12 is located at the winding position P1, while the
other bobbin holder 12 is located at a standby position P2.
[0017] As shown in Figures 1 and 2, a driving source 13 comprising a motor M1 drives the
first bobbin holder 11, while a driving source 14 comprising a motor M2 drives the
second bobbin holder 12.
[0018] The yarn Y is wound around the bobbin B on the bobbin holder 11 located at the winding
position P1. Each time the bobbin B becomes a full bobbin FB, the turret plate 2 rotates
180° to move the full bobbin FB at the winding position P1 to the standby position
P2 while moving the empty bobbin EB prepared at the standby position P2 to the winding
position P1. Then, a yarn transferring mechanism transfers the yarn from the full
bobbin FB to the empty bobbin EB to provide continuous winding.
[0019] The plurality of (in the example shown in Figure 3, six) bobbins B are installed
on each of the bobbin holders 11 and 12. During winding, one 11 of the bobbin holders
11, 12 is located at the winding position P1, while the other bobbin holder 12 is
located at the standby position P2.
[0020] In the take-up winder U, the yarn Y passes through the traverse guide 5 of the traverse
device 4, around the contact roller 3, and onto the bobbin B at the winding position
P1.
[0021] According to the present invention, the contact controller 3 is configured to guide
the traversing yarn Y by the traverse guide 5 of the traverse device 4 and to repeatedly
contact and separate from the bobbin during winding. The yarn Y is guided to the bobbin
B at the winding position at a distance of given free length L measured from the point
at which the yarn Y leaves the contact roller 3 to the contact point of the winding
yarn at the bobbin.
[0022] Figures 3 and 4 show a specific example of a configuration for varying the free length
L in the winding method for the take-up winder according to the present invention.
Figure 3 shows a configuration in which the contact roller 3 is contacting the bobbin
B (Figure 3A), and in this configuration, the turret plate 2 supporting the bobbin
B rotates θ ° counterclockwise to mutually separate the bobbin B and the contact roller
3, thereby providing a long free length L (smaller winding width).
[0023] By contrast, Figure 4 shows a configuration in which the contact roller 3 is contacting
the bobbin B (Figure 4A), and in this configuration, the elevating box 1 supporting
the contact roller 3 ascends so as to mutually separate the bobbin B and the contact
roller 3, thereby providing a long free length L (a smaller winding width).
[0024] An important characteristic of the present invention is that the rotations of the
first and second bobbin holders 11 and 12 and the contact roller 3 must be controlled
due to the configuration in which the contact roller 3 is separated from the bobbin
B.
[0025] According to the present invention, the drive motor 13 (M1) is provided for the first
bobbin holder 11 holding the bobbin B, the second drive motor 14 (M2) is provided
for the second bobbin holder 12, and the third drive motor 10 (M3) is provided for
the contact roller 3.
[0026] A controlling system for the take-up winder according to the present invention will
be explained based on the specific embodiment shown in Figure 1.
[0027] First, if the yarn is being wound while the contact roller 3 is contacting the bobbin
B, a contact roller rotation speed detection means 16 comprising a contact roller
rotation speed detection sensor 15 provided for the contact roller 3 detects the rotation
speed of the contact roller 3 to control the rotation speed of the motor 13 (M1) for
the bobbin holder 11 at the winding position P1 on the basis of the detected value.
If the bobbin holder 12 is at the winding position P1, the rotation speed of the motor
14 (M2) for the bobbin holder 12 is controlled.
[0028] On the other hand, according to the present invention, the control executed when
the roller 3 separates from the bobbin B is important. The take-up winder U shown
in Figure 1 comprises a contact/leave switching control means 17. The contact/leave
switching control means 17 outputs control signals to an elevation control means 18
for controlling the elevating box 1 as well as to a rotation control means 19 for
controlling the rotation of the turret plate 2. The contact/leave switching control
means 17 also outputs control signals to a contact roller drive motor control means
20 for controlling the contact roller drive motor 10 (M3), a first bobbin holder drive
motor control means 21 for controlling the first bobbin holder drive motor 13 (M1),
and a second bobbin holder drive motor control means 22 for controlling the second
bobbin holder drive motor 14 (M2).
[0029] The contact/leave switching control means 17 supplies an instruction to the rotation
control means 19 for the turret plate or the elevation control means 18 for the elevating
box, and if the contact roller 3 separates from the bobbin B, the contact/leave switching
control means 17 changes, via the bobbin holder drive motor control means, the control
of the drive motor for the bobbin holder at the winding position P1. The bobbin holder
drive motor control means has a motor instruction value calculating means 23, a motor
instruction value output means 24, and a motor instruction value input means 25, and
while the bobbin B is contacting the contact roller 3, the motor instruction value
calculating means 23 calculates a motor instruction value based on a detection signal
from the contact roller rotation speed detection means 16, and the motor instruction
value output means 24 outputs a control signal to the bobbin holder drive motor.
[0030] While, however, the bobbin B is separate from the contact roller 3, the motor instruction
value calculating means 23 calculates a subsequent motor instruction value based on
a detection signal (a motor instruction value) from the motor instruciton value input
means 25 provided when the bobbin B leaves the contact roller 3, and the motor instruction
value output means 24 outputs a control signal to the bobbin holder drive motor.
[0031] Specifically, the rotation speed (an instruction value for the bobbin holder drive
motor) of the bobbin holder immediately before the bobbin B separates from the contact
roller 3 is input, and after the bobbin B has left the contact roller 3, the rotation
speed of the bobbin holder is reduced over time based on the input rotation speed.
[0032] Then, the relationship between the free length L and the axial winding width W in
the axial direction of the bobbin B associated with the displacement of the contact
roller 3 will be described with reference to Figures 5 and 6.
[0033] Figure 5 is a schematic explanatory drawing for the winding method for a take-up
winder according to the present invention. Figure 5 is figure for explaning a principle
how the winding width increases with decreasing free length and decreases with increasing
free length, and also is a summary principle explanation figure which shows the state
of the yarn path established when a yarn is wound at a winding angle θ. Figure 6 is
a graph showing an example of the pattern of changes in free length based on the relationship
between the free length and the winding diameter (winding duration).
[0034] The contact roller 3 is a driving roller and is driven by the driving source 10 comprising
the motor M3, and is located between the traverse guide 5 and the bobbin B to guide
the traversing yarn Y to the bobbin B. In this case, while that yarn is traveling,
the contact roller 3 contacts and supports the yarn Y over a contact distance Lx.
[0035] The distance between the guide 5 and a contact start point CP
1 of a contact distance Lx on the contact roller 3 is defined as the first free length
portion L
0 (fixed), and the distance between a contact end point CP
2 of the contact distance Lx on the contact roller 3 and a winding contact point WP
of the bobbin B at the winding position is defined as the second free length portion
(variable) which varies between free length L
1 and L
2. In this case, the winding width W1 is a winding width at the free length L
1 and the winding width W2 is a winding width at the free length L
2.
[0036] According to the illustrated take-up winder U, the winding angle θ is determined
by the traversing speed of the traverse guide 5 of the traverse device 4 and the peripheral
speed of the bobbin B, as shown in the vector diagram in Figure 5. The yarn path established
while the yarn Y is being wound around the bobbin B at the winding angle θ is as shown
in Figure 5. As shown in this figure, when the traverse guide 5 reaches the traverse
end, the yarn Y follows a yarn path YA, and after the traverse guide 5 makes a turn,
the yarn Y shifts to yarn path YB. In this case, if the free length varies between
L
1 and L
2, the winding width increases to W
2 when the free length is short L
2, and decreases to W1 when the free length is long L
1. While the bobbin B is contacting the contact roller 3, the free length L becomes
zero (0) and the winding width W is at a maximum.
[0037] A variety of winding methods can be applied to the take-up winder according to the
present invention. In one method, the free length is switched between L
1 and 0 at specified times to allow the bobbin and the contact roller to contact and
separate and thereby wind the yarn, as shown by pattern A in Figure 6. In another
method, the free length L is aperiodically varied between L
1 and 0 to allow the bobbin and the contact roller to contact and separate and thereby
wind the yarn. However, the per time during which the bobbin and the contact roller
are mutually separated is preferably short, and within the overall winding time period,
the total bobbin/contact roller separation time is preferably shorter than the total
time during which they contact each other.
[0038] In a take-up winder to which the winding method according to the present invention
is applied, the traverse device is not limited to the illustrated cam traverse device,
and may comprise a blade type traverse device. The present invention can then be applied
to, for example, the winding of elastic yarns etc..
[0039] The winding method for a take-up winder according to the present invention configured
as described above repeatedly causes a contact roller to contact and separate from
a bobbin. This enables the free length to vary during yarn winding, and thus helps
vary the winding width in the axial direction of the bobbin, thereby providing good
yarn packages in which the edge shape of a yarn layer of a package are prevented from
becoming a saddle bag shape. Therefore, this method is very effective in achieving
the object of the present invention.