BACKGROUND OF THE INVENTION
[0001] The present invention relates to a yarn winder including dancer rolls configured
to reduce the tension fluctuation of yarns.
[0002] When yarns having high stiffness (stiff yarns) are wound in a yarn winder, the tension
of the yarns tends to fluctuate. This is because, when the length of the yarns changes
due to, for example, a change in the production speed of the yarns or the operation
of traversing the yarns, the change of the yarn length is less likely to be absorbed
due to the low flexibility of the yarns. To reduce or minimize such tension fluctuation,
JP H11-301930 A discloses providing dancer rolls. Onto each dancer roll, a yarn is wound. Each dancer
roll is configured so that: when the yarn length is short, the dancer roll moves to
a relaxation side on which the yarn is relaxed; and when the yarn length is long,
the dancer roll moves to a tension side on which the slack of the yarn is removed.
The dancer roll is configured to move to the relaxation side or to the tension side
as needed depending on the yarn length, and this makes it possible to reduce or minimize
the tension fluctuation.
[0003] If the yarn length greatly changes in the above configuration, there is a possibility
that the dancer roll reaches its limit position on the relaxation side or on the tension
side. In this case, the tension fluctuation cannot be reduced any more. In such a
case, control of returning the dancer roll to a predetermined reference position is
performed by adjusting the rotation number of the spindle supporting packages, that
is, by adjusting the winding speed of the yarns.
[0004] JP H02 270774 A discloses a yarn winder according to the preamble of claim 1.
SUMMARY OF THE INVENTION
[0005] In a single-package-per-spindle yarn winder, in which only one package is formed
per spindle, it is possible to return a dancer roll to the reference position as needed
by adjusting the rotation number of the corresponding spindle as described above,
and this allows the tension fluctuation to be reduced or minimized continuously. However,
in a multiple-package-per-spindle yarn winder including one or more common spindles
each configured to support a plurality of packages, the above control of adjusting
the rotation number of the spindle may meet with failure. Now, the following describes
this regard in detail.
[0006] In the multiple-package-per-spindle yarn winder, a plurality of dancer rolls are
provided respectively for a plurality of yarns. In this yarn winder, the position
of each dancer roll changes depending on the length of the corresponding yarn, and
there may be large differences among the positions of the dancer rolls. If, under
this situation, the rotation number of the spindle is adjusted so as to return the
position of one of the dancer rolls to the reference position, all the dancer rolls
corresponding to this spindle uniformly move to the relaxation side or to the tension
side. As a result, even though the one of the dancer rolls is returned back to the
reference position, there is a possibility that one or more other dancer rolls reach
the limit position. Although
JP H11-301930 A describes such a multiple-package-per-spindle yarn winder, the above problem is not
mentioned at all.
[0007] The present invention has been made in view of the above-described problem. An object
of the present invention is to properly control the positions of dancer rolls in a
yarn winder including one or more common spindles each configured to support a plurality
of bobbins (packages).
[0008] According to an aspect of the present invention, a yarn winder including at least
one common spindle each configured to support a plurality of bobbins, the yarn winder
configured to rotate the spindle to wind yarns onto the bobbins respectively to form
packages, includes: traverse units configured to traverse the yarns respectively;
dancer rolls onto which the yarns are respectively wound, each of the dancer rolls
configured to be movable from a predetermined reference position toward a relaxation
side on which a corresponding one of the yarns is relaxed and toward a tension side
on which yarn slack is removed; position detectors configured to detect positions
of the dancer rolls, respectively; and a controller configured to control a position
of at least one of the dancer rolls based on outputs from the position detectors by
adjusting traversal speed of corresponding at least one of the traverse units traversing
the yarn wound onto the at least one of the dancer rolls .
[0009] In the above aspect of the present invention, the traverse units are respectively
provided for the yarns. The position of a desired one of the dancer rolls is controllable
by adjusting the traversal speed of the traverse unit traversing the yarn wound onto
the desired one of the dancer rolls. Thus, the position of each dancer roll is controllable
by adjusting the traversal speed of the corresponding traverse unit. This makes it
possible to control the positions of the dancer rolls individually, and therefore
to properly control the position of each dancer roll.
[0010] Furthermore, in the above aspect of the present invention, when a difference between
positions of freely-selected two of the dancer rolls exceeds a predetermined threshold,
the controller performs positional difference eliminating control of reducing the
difference between the positions of the two dancer rolls to a level equal to or smaller
than the threshold by adjusting the traversal speed of at least one of two traverse
units traversing the yarns wound onto the two dancer rolls.
[0011] When there is a large difference between the positions of the dancer rolls, the difference
is reduced by performing the positional difference eliminating control.
[0012] Furthermore, in the above aspect of the present invention, it is preferable that
in the positional difference eliminating control, the controller is configured to
decrease the traversal speed of a corresponding one of the two traverse units which
traverses the yarn wound onto a relaxation-side dancer roll of the two dancer rolls,
the relaxation-side dancer roll being on the relaxation side relatively to the other
dancer roll.
[0013] This moves the relaxation-side dancer roll to the tension side, and decreases the
difference between the positions of the dancer rolls. A yarn slip may occur as a result
of increasing the traversal speed. However, the position of the dancer roll is controlled
by decreasing the traversal speed as above, and therefore the yarn slip is avoidable.
[0014] Furthermore, in the above aspect of the present invention, it is preferable that
the controller is configured to perform processing of the positional difference eliminating
control within a time period of a single reciprocation cycle in which the traverse
unit reciprocates the yarn once in a traverse direction.
[0015] Long-term execution of the positional difference eliminating control, in which the
traversal speed is changed, may misshape the package. Performing the processing of
the positional difference eliminating control only for the short period of time as
described above ensures good quality of the packages.
[0016] Furthermore, in the above aspect of the present invention, the at least one spindle
includes two spindles, and it is preferable that the yarn winder further includes:
a switching device configured to support the two spindles so that positions of the
two spindles are interchangeable with each other between a winding position at which
the yarns are respectively wound onto the bobbins and a collection position at which
the packages are collected; and a plurality of cutting means configured to respectively
cut the yarns leading to the packages supported by the spindle having been moved from
the winding position to the collection position by the switching device, wherein the
controller is configured to perform the positional difference eliminating control
immediately before interchanging the positions of the two spindles by the switching
device, irrespective of whether or not the difference between the positions of the
two dancer rolls exceeds the threshold.
[0017] When there is a large difference between the positions of the dancer rolls at the
time of cutting the yarns, there is a possibility that variations in the timings of
cutting the yarns occur and/or one or some of the yarns cannot be cut. Forcedly performing
the positional difference eliminating control immediately before the interchanging
the positions of the spindles as above enables cutting the yarns simultaneously.
[0018] Furthermore, in the above aspect of the present invention, it is preferable that
the controller is configured to perform the positional difference eliminating control
immediately after the yarns are cut by the plurality of cutting means, irrespective
of whether or not the difference between the positions of the two dancer rolls exceeds
the threshold.
[0019] Although in the present invention, the position of each dancer roll is controllable
by adjusting the traversal speed of the corresponding traverse unit, it is preferable
that the traversal speed is as constant as possible in order to improve the quality
of the packages. Thus, forcedly performing the positional difference eliminating control
immediately after cutting the yarns as described above, i.e., at the time of starting
the winding of the yarns onto empty bobbins, minimizes the necessity to change the
traversal speed during the winding process.
[0020] Furthermore, in the above aspect of the present invention, it is preferable that
the controller is capable of changing traverse widths of the traverse units.
[0021] When the traversal speed of a yarn is changed, the actual winding width of the yarn
may change, which will be described later. Thus, the above arrangement in which the
traverse width of each traverse unit is changeable makes it possible to keep its winding
width constant by adjusting the traverse width depending on the change of the traversal
speed.
[0022] Furthermore, in the above aspect of the present invention, it is preferable that
when decreasing the traversal speeds of one or more of the traverse units, the controller
is configured to decrease the traverse widths of the one or more traverse units.
[0023] As described above, the slip of a yarn is avoidable by decreasing the traversal speed
to control the position of the corresponding dancer roll. However, the decrease of
the traversal speed makes the winding width longer, which may lead to cob-webbing.
To deal with this, the traverse width is decreased at the same time when the traversal
speed is decreased. This makes it possible to maintain the winding width constant
while avoiding the slip of the yarn.
[0024] Furthermore, in the above aspect of the present invention, it is preferable that
the controller is configured to perform winding speed control of moving the positions
of the dancer rolls by adjusting a rotation number of the spindle.
[0025] Performing the winding speed control makes it possible to control the positions of
the dancer rolls not only by adjusting the traversal speed, but also by adjusting
the rotation number of the spindle.
[0026] Furthermore, in the above aspect of the present invention, it is preferable that
in the winding speed control, the controller is configured to adjust the rotation
number of the spindle so that one of the dancer rolls is moved to the reference position.
[0027] With this winding speed control, one of the dancer rolls is moved to the reference
position. Due to this, merely by performing the positional difference eliminating
control for the other dancer roll(s) so as to reduce the difference from the one of
the dancer rolls, it is possible to keep all the dancer rolls at the reference position.
[0028] Furthermore, in the above aspect of the present invention, it is preferable that
in the winding speed control, the controller is configured to adjust the rotation
number of the spindle so that out of the dancer rolls, the dancer roll positioned
farthest on the tension side from the reference position is moved to the reference
position.
[0029] As a result of performing the winding speed control as above so as to move the farthest
dancer roll on the tension side to the reference position, the other dancer roll(s)
is/are positioned on the relaxation side relatively to the reference position. When
performing the positional difference eliminating control to the each of the other
dancer rolls so as to reduce the difference in position from the one of the dancer
rolls, the traversal speed shall be decreased. Accordingly, the slip of the yarn is
avoidable, as described above.
BRIEF DESCRIPTION OF THE DRAWINGS
[0030]
FIG. 1 is a schematic diagram of a yarn winder of a present embodiment.
FIG. 2 is a series of schematic diagrams illustrating the operation of interchanging
the positions of spindles.
FIG. 3 is a flowchart illustrating processing of positional control of dancer rolls.
FIG. 4 is a flowchart illustrating processing of winding speed control.
FIG. 5 is a flowchart illustrating processing of positional difference eliminating
control.
FIG. 6 is a schematic diagram illustrating a change in winding width with a change
in traversal speed.
FIG. 7 is a flowchart illustrating processing of winding speed control in another
embodiment.
FIG. 8 is a flowchart illustrating processing of positional difference eliminating
control in the other embodiment.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
(Structure of Yarn Winder)
[0031] The following will describe an example of embodiments of a yarn winder of the present
invention. FIG. 1 is a schematic diagram of a yarn winder of the present embodiment.
A yarn winder 1 is configured to wind yarns Y produced in a yarn production apparatus
100 onto bobbins B, to form packages P. In the present embodiment, the yarn winder
1 is configured to wind two yarns Y onto two bobbins B to form two packages P.
[0032] As shown in FIG. 1, the yarn winder 1 includes: first rollers 11, dancer roll mechanisms
12, second rollers 13, fulcrum rollers 14, and a winding device 15, in this order
from an upstream side in a yarn running direction. Of these, the first roller 11,
the dancer roll mechanism 12, the second roller 13, and the fulcrum roller 14 are
provided for each of the yarn paths of the two yarns Y. The winding device 15 is provided
to be shared by the two yarns Y.
[0033] The first rollers 11 and the second rollers 13 are fixed. Each dancer roll mechanism
12 includes a dancer roll 31, which is provided between the corresponding first and
second rollers 11 and 13. Each yarn Y is wound around upper portions of the corresponding
first and second rollers 11 and 13, and is wound around a lower portion of the corresponding
dancer roll 31. Due to this, the yarn path extending from the first roller 11 to the
second roller 13 via the dancer roll 31 has a V-shape. The dancer roll mechanisms
12 will be detailed later. The fulcrum rollers 14 are fixed, and function as fulcrums
when the yarns Y are traversed in the winding device 15. The fulcrum rollers 14 may
be omitted when the second rollers 13 are used to function as the fulcrum rollers
14.
[0034] The winding device 15 includes a base 16, a turret 17, spindles 18, traverse units
19, a controller 20, and the like. The turret 17 has a disc-like shape and is attached
to the base 16. The turret 17 is rotated and driven by a turret motor 21. The two
long cylindrical spindles 18 cantilever from the turret 17. The spindles 18 are rotated
and driven by their respective spindle motors 22. Two bobbins B are attached to each
spindle 18 so as to be aligned in the axial direction of the spindle 18. The operations
of the turret motor 21 and the spindle motors 22 are controlled by the controller
20.
[0035] The positions of the two spindles 18 are interchangeable with each other between
a winding position L1 and a collection position L2, by rotating the turret 17 by the
turret motor 21 about a central axis C which is parallel to the axial direction of
the spindles 18. In a winding process of the yarns Y, the yarns Y are wound onto the
bobbins B attached to the spindle 18 at the winding position L1, so that packages
P are formed. When the packages P become full, the positions of the two spindles 18
are interchanged with each other. After the spindle 18 supporting the full packages
P moves to the collection position L2, the packages P are collected.
[0036] Ring-shaped yarn holding portions 18a are fitted around each spindle 18 so as to
be movable in the axial direction. Each yarn holding portion 18a is provided near
a position where the corresponding bobbin B is attached. The yarn holding portion
18a is configured to hold the corresponding yarn Y between the yarn holding portion
18a and the bobbin B in the following manner: a gap is first created between the yarn
holding portion 18a and the bobbin B by moving the yarn holding portion 18a away from
the bobbin B, and then, as soon as the yarn Y enters the gap, the yarn holding portion
18a is moved toward the bobbin B so that the yarn Y is held between them. Cutters
23 are provided in the vicinity of the respective yarn holding portions 18a. Each
cutter 23 is configured to cut the corresponding yarn Y leading to the full package
P. The operations of the yarn holding portions 18a and the cutters 23 are controlled
by the controller 20.
[0037] Now, a description is given to the operation of starting the winding process of the
yarns Y onto the bobbins B attached to the spindle 18 having just moved to the winding
position L1 as a result of interchanging the positions of the two spindles 18. FIG.
2 is a series of schematic diagrams illustrating the operation of interchanging the
positions of the spindles 18. In FIG. 2, the two spindles 18 are viewed from the left
side in FIG. 1.
[0038] When each package P supported by the spindle 18 at the winding position L1 becomes
full as shown in FIG. 2(a), the turret 17 is rotated 180 degrees in a counterclockwise
direction in FIG. 2, so that the positions of the two spindles 18 are interchanged
with each other as shown in FIG. 2(b). In the state of FIG. 2(b), each yarn Y still
leads to the corresponding package P, and the yarn Y is in contact with the outer
circumferential surface of the corresponding bobbin B attached to the spindle 18 which
has just come to the winding position L1. Then, substantially at the same time when
each yarn holding portion 18a provided to the spindle 18 at the winding position L1
is actuated to hold the corresponding yarn Y, the yarn Y is cut by the corresponding
cutter 23, at a point between a portion held by the yarn holding portion 18a and the
package P. Consequently, as shown in FIG. 2(c), the yarn Y is handed over from the
package P at the collection position L2 to the empty bobbin B at the winding position
L1, and then winding of the yarn Y onto the empty bobbin B is started.
[0039] Returning back to FIG. 1, each traverse unit 19 is attached to the base 16 via an
unillustrated supporting member. The traverse units 19 are provided respectively for
the two yarns Y. The traverse units 19 are controlled independently from each other
by the controller 20. A traverse guide 19a provided to each traverse unit 19 is configured
to reciprocate in the axial direction of the spindles 18, i.e., in a "traverse direction".
As each traverse guide 19a to which the corresponding yarn Y is threaded reciprocates
in the traverse direction, the yarn Y is traversed about the corresponding fulcrum
roller 14. While being traversed, the yarn Y is wound onto the corresponding bobbin
B. In the example of FIG. 1, each traverse unit 19 is formed by the combination of
pulleys and a belt, however, the structure of the traverse unit 19 is not limited
to this. For example, the traverse unit may be formed by a ball screw and the like.
[0040] The yarns Y intended herein to be wound by the yarn winder 1 are stiff yarns having
an elastic modulus of 3 GPa or higher, such as carbon fiber yarns or aramid fiber
yarns, for example. Nylon yarns, which are typical synthetic fiber yarns, have a relatively
low stiffness, and therefore even when the tension fluctuation of the yarns occurs,
the tension fluctuation can be absorbed due to the flexibility of the yarns. To the
contrary, the above-mentioned stiff yarns have little flexibility, and therefore the
tension of the yarns may greatly fluctuate. To deal with this, the yarn winder 1 is
provided with the dancer roll mechanisms 12, which make it possible to reduce or minimize
the tension fluctuation of the yarns Y even when the yarns Y have high stiffness.
In the yarn winder 1, the traversal speed is 35 m/min or lower, and the winding speed
is 100 m/min or lower. That is, the yarn winder 1 is structured so that the yarns
Y are wound at a relatively low speed.
[0041] Each dancer roll mechanism 12 includes a dancer roll 31, a dancer arm 32, a shaft
33 and a position sensor 34. As described above, the dancer roll 31 is provided between
the corresponding first roller 11 and second roller 13 with respect to the yarn running
direction. The yarn path extending from the first roller 11 to the second roller 13
via the dancer roll 31 has a V-shape. The dancer roll 31 is rotatably supported at
a leading end portion of the dancer arm 32. A base end portion of the dancer arm 32
is attached to the shaft 33 in a swingable manner, and this allows the dancer roll
31 to move in an up-down direction.
[0042] Each dancer roll mechanism 12 is adjusted so that the dancer roll 31 is basically
at a predetermined reference position. The reference position is indicated with solid
lines in FIG. 1. When the tension of the yarn Y fluctuates due to a change in the
length of the yarn Y, for example, the dancer roll 31 moves in the up-down direction
from the reference position, thereby to reduce or minimize the tension fluctuation.
Specifically, when the length of the portion of the yarn Y between the yarn production
apparatus 100 and the winding device 15 becomes shorter, the dancer roll 31 moves
toward an upper side (equivalent to a "relaxation side" in the present invention)
to relax the yarn Y, with the result that the tension fluctuation of the yarn Y is
reduced or minimized. Meanwhile, when the length of the portion of the yarn Y between
the yarn production apparatus 100 and the winding device 15 becomes longer, the dancer
roll 31 moves toward a lower side (equivalent to a "tension side" in the present invention)
to eliminate the slack of the yarn Y, with the result that the tension fluctuation
of the yarn Y is reduced or minimized. However, there is a limitation to the range
of the movement of the dancer roll 31 in the up-down direction. The dancer roll 31
is movable only between an upper limit position (position indicated with dashed lines
in FIG. 1) and a lower limit position (position indicated with two-dot chain lines
in FIG. 1).
[0043] Each position sensor 34 is configured to detect the swing angle of the corresponding
dancer arm 32. The swing angle indicates the position of the dancer roll 31. The controller
20 is configured to control the rotation number of the spindle 18 and the traversal
speed and traverse width of each traverse unit 19, based on the output from each position
sensor 34.
(Positional Control of Dancer Roll)
[0044] Conventionally, when the length of a part of a yarn Y between the yarn production
apparatus 100 and the winding device 15 greatly changes and therefore the corresponding
dancer roll 31 reaches its upper limit position or lower limit position, the rotation
number of the corresponding spindle 18 is adjusted to adjust the winding speed, so
as to return the dancer roll 31 to the reference position. Now, in the present embodiment,
the plurality of bobbins B are supported by the common spindle 18. In such an arrangement,
the above-described positional control of the dancer rolls 31 through adjusting the
rotation number of the spindle 18 may meet with failure if there is a large difference
between the positions of the dancer rolls 31.
[0045] Specifically, in cases where the two bobbins B are supported by the common spindle
18 as in the present embodiment, adjustment of the rotation number of the spindle
18 to return back one of the dancer rolls 31 to the reference position necessitates
the other of the dancer rolls 31 to move simultaneously. As a result, even though
the one of the dancer rolls 31 is returned back to the reference position, the other
of the dancer rolls 31 may reach the upper limit position or the lower limit position.
That is, because the adjustment of the rotation number of the spindle 18 disadvantageously
moves all the dancer rolls 31 uniformly, there has been a limitation in the positional
control of each individual dancer roll 31. Taking the above into consideration, in
the present embodiment, in addition to the "winding speed control" of adjusting the
rotation number of the spindle 18, there is performed "positional difference eliminating
control" of adjusting the traversal speed of each traverse unit 19 individually. This
enables versatile control.
[0046] One of factors for causing a large difference between the positions of the two dancer
rolls 31 is a difference between the production speeds of the two yarns Y. For example,
reference is made to a case where carbon fiber yarns Y are produced in the yarn production
apparatus 100. In this case, the yarns Y are produced by baking material precursors.
A large difference between the production speeds of the two yarns Y may be caused
by a difference between the degrees of shrinkage at the time of baking, a difference
between the gripping forces of rollers feeding the yarns Y, and/or the like. The positional
difference eliminating control of the present embodiment is particularly effective
in such a case.
[0047] FIG. 3 is a flowchart illustrating processing of the positional control of the dancer
rolls 31. FIG. 4 is a flowchart illustrating processing of the winding speed control.
FIG. 5 is a flowchart illustrating processing of the positional difference eliminating
control. While the yarns Y are wound, the processing of the winding speed control
(Step S10) and the processing of the positional difference eliminating control (Step
S11) are performed at appropriate timings (for example, at predetermined time intervals).
While in the present embodiment, the processing of the positional difference eliminating
control is performed subsequently to the processing of the winding speed control,
both the control processes may be performed simultaneously. In the following description,
directions with respect to the position of the dancer roll 31 are defined as follows:
the direction toward the upper side (relaxation side) is a positive direction of a
coordinate, and the direction toward the lower side (tension side) is a negative direction
of the coordinate.
[0048] Now, the winding speed control is described with reference to FIG. 4. In the winding
speed control of the present embodiment, the rotation number of the spindle 18 is
adjusted so that the lower dancer roll 31, positioned lower than the other, is returned
to a reference position PO. Hereinafter, for the sake of differentiation, "A" is affixed
to reference sings for elements related to one of the yarns Y, and "B" is affixed
to reference signs for elements related to the other of the yarns Y, as needed.
[0049] First of all, the controller 20 obtains positions PA and PB of the dancer rolls 31A
and 31B, which are respectively detected by the position sensors 34A and 34B (Step
S20). Then, the controller 20 determines whether the position PA of the dancer roll
31A is lower than the position PB of the dancer roll 31B (Step S21). When the position
PA of the dancer roll 31A is lower than the position PB of the dancer roll 31B (Step
S21: YES), the controller 20 determines whether the position PA of the dancer roll
31A is higher than the reference position PO (Step S22). When the position PA of the
dancer roll 31A is higher than the reference position PO (Step S22: YES), the controller
20 reduces the rotation number of the spindle 18 (Step S23), so as to lower the position
PA of the dancer roll 31A to the reference position PO, and then the processing of
the winding speed control ends.
[0050] Meanwhile, when the position PA of the dancer roll 31A is not higher than the reference
position PO (Step S22: NO), the controller 20 determines whether the position PA of
the dancer roll 31A is lower than the reference position PO (Step S24). When the result
of the above determination shows that the position PA of the dancer roll 31A is lower
than the reference position PO (Step S24: YES), the controller 20 increases the rotation
number of the spindle 18 (Step S25) so as to raise the position PA of the dancer roll
31A to the reference position PO, and then the processing of the winding speed control
ends. When the position PA of the dancer roll 31A is not lower than the reference
position PO (Step S24: NO), it is indicated that the position PA of the dancer roll
31A is level with the reference position PO, and therefore the processing of the winding
speed control ends without changing the rotation number of the spindle 18.
[0051] When the result of the determination in Step S21 is NO, the controller 20 determines
whether the position PB of the dancer roll 31B is higher than the reference position
PO (Step S26). When the result of the above determination shows that the position
PB of the dancer roll 31B is higher than the reference position PO (Step S26: YES),
the controller 20 decreased the rotation number of the spindle 18 (Step S27) so as
to lower the position PB of the dancer roll 31B to the reference position PO, and
then the processing of the winding speed control ends.
[0052] Meanwhile, when the position PB of the dancer roll 31B is not higher than the reference
position PO (Step S26: NO), the controller 20 determines whether the position PB of
the dancer roll 31B is lower than the reference position PO (Step S28). When the result
of the above determination shows that the position PB of the dancer roll 31B is lower
than the reference position PO (Step S28: YES), the controller 20 increases the rotation
number of the spindle 18 (Step S29) so as to raise the position PB of the dancer roll
31B to the reference position PO, and then the processing of the winding speed control
ends. When the position PB of the dancer roll 31B is not lower than the reference
position PO (Step S28: NO), it is indicated that the position PB of the dancer roll
31B is level with the reference position PO, and therefore the processing of the winding
speed control ends without changing the rotation number of the spindle 18.
[0053] Next, the processing of the positional difference eliminating control is described
with reference to FIG. 5. In the positional difference eliminating control of the
present embodiment, when there is a large difference between the position PA of the
dancer roll 31A and the position PB of the dancer roll 31B, the traversal speed of
the traverse unit 19 traversing the yarn Y wound onto the dancer roll 31 higher than
the other is adjusted so as to move only the higher dancer roll 31 to the reference
position PO.
[0054] First of all, the controller 20 obtains the positions PA and PB of the dancer rolls
31A and 31B, which are respectively detected by the position sensors 34A and 34B (Step
S30). Then, the controller 20 determines whether the difference between the position
PA of the dancer roll 31A and the position PB of the dancer roll 31B is within (equal
to or smaller than) a predetermined threshold PX (Step S31). When the difference between
the position PA of the dancer roll 31A and the position PB of the dancer roll 31B
is equal to or smaller than the threshold PX (Step S31: YES), the processing of the
positional difference eliminating control ends without changing the traversal speed
of any of the traverse units 19A and 19B.
[0055] Meanwhile, when the difference between the position PA of the dancer roll 31A and
the position PB of the dancer roll 31B exceeds the threshold PX (Step S31: NO), the
controller 20 determines whether the position PA of the dancer roll 31A is lower than
the position PB of the dancer roll 31B (Step S32). When the result of the above determination
shows that the position PA of the dancer roll 31A is lower than the position PB of
the dancer roll 31B (Step S32: YES), the controller 20 decreases the traversal speed
of the traverse unit 19B for a predetermined period of time so as to lower the position
PB of the dancer roll 31B, which is positioned higher, to the reference position PO
(Step S33). Then, the controller 20 returns the traversal speed of the traverse unit
19B back to its original speed (Step S34), and the processing of the positional difference
eliminating control ends.
[0056] Meanwhile, when the result of the determination in Step S32 is NO, the controller
20 decreases the traversal speed of the traverse unit 19A for the predetermined period
of time so as to lower the position PA of the dancer roll 31A, which is positioned
higher, to the reference position PO (Step S35). Then, the controller 20 returns the
traversal speed of the traverse unit 19A back to its original speed (Step S36), and
the processing of the positional difference eliminating control ends. The above-mentioned
"predetermined period of time" during which the traversal speed is adjusted in each
Step S33, S35 may be freely set as needed. In the present embodiment, the predetermined
period of time is equal to a time period of a single reciprocation cycle in which
the traverse guide 19a reciprocates once in the traverse direction.
[0057] As described above, in the positional control of the dancer rolls 31 of the present
embodiment, the processing of the winding speed control is performed first. With this,
both of the dancer rolls 31A and 31B move uniformly toward the upper or lower side
so that the lower one of the dancer rolls 31A and 31B, which is positioned lower than
the other, returns back to the reference position PO. In the processing of the positional
difference eliminating control performed subsequently, only the upper dancer roll
31, which is positioned higher than the other, is moved to the reference position
PO when there is a large difference between the position PA of the dancer roll 31A
and the position PB of the dancer roll 31B. In this case, the difference in position
between this dancer roll 31 and the other dancer roll 31, which has already moved
to the reference position PO in the winding speed control, is reduced. That is, by
performing the processing of the winding speed control in Step S10 and subsequently
performing the processing of the positional difference eliminating control in Step
S11, both the dancer rolls 31A and 31B are kept at or close to the reference position
PO.
[0058] Returning back to FIG. 3, after Steps S10 and S11 are performed, the controller 20
determines whether the formation of the packages P has been completed, that is, whether
the packages P have become full, based on outputs from unillustrated sensors or the
like (Step S12). When the formation of the packages P has not been completed (Step
S12: NO), the processing of the winding speed control and the processing of the positional
difference eliminating control are repeated.
[0059] Meanwhile, when the formation of the packages P has been completed (Step S12: YES),
processing of forced positional difference eliminating control is performed (Step
S13). The forced positional difference eliminating control is the same as the positional
difference eliminating control except that it is forcedly performed regardless of
whether the difference between the position PA of the dancer roll 31A and the position
PB of the dancer roll 31B exceeds the threshold PX. Specifically, in this processing,
Step S31 is skipped in the flowchart of FIG. 5, and Step S32 is performed after Step
S30. Immediately after the processing of the forced positional difference eliminating
control is performed, the turret 17 is rotated to interchange the positions of the
two spindles 18 with each other, and then the yarn holding portions 18a are controlled
so that the yarns Y are held by the respective bobbins B, and simultaneously with
this, the yarns Y leading to the respective packages P are cut by the respective cutters
23 (Step S14). With this, winding of the yarns Y onto the respective empty bobbins
B is started. Immediately after the start of the winding, the processing of the forced
positional difference eliminating control is performed again (Step S15), and the series
of steps are repeatedly performed from Step S10.
(Advantageous Effects)
[0060] In the present embodiment, the position of a desired one of the dancer rolls 31 is
controllable by adjusting the traversal speed of the traverse unit (19A or 19B) traversing
the yarn Y wound onto the desired one of the dancer rolls 31. Thus, the position PA,
PB of each dancer roll 31A, 31B is individually controllable by adjusting the traversal
speed of the corresponding traverse unit. This makes it possible to properly control
the position PA, PB of the dancer roll 31A, 31B.
[0061] Furthermore, in the present embodiment, when the difference between the positions
PA and PB of the two dancer rolls 31A and 31B exceeds the predetermined threshold
PX, the controller 20 performs the positional difference eliminating control of reducing
the difference between the positions PA and PB of the two dancer rolls 31A and 31B
to a level equal to or smaller than the threshold PX by adjusting the traversal speed
of at least one of the two traverse units 19A and 19B traversing the yarns Y wound
onto the two dancer rolls 31A and 31B. When there is a large difference between the
positions PA and PB of the dancer rolls 31A and 31B, the difference is reduced by
performing the positional difference eliminating control.
[0062] Furthermore, in the positional difference eliminating control in the present embodiment,
the controller 20 is configured to decrease the traversal speed of the traverse unit
19 which traverses the yarn Y wound onto the upper dancer roll 31, which is positioned
on the upper side (relaxation side) relatively to the other, out of the two dancer
rolls 31A and 31B. This moves the upper dancer roll 31 to the lower side (tension
side), and decreases the difference between the positions PA and PB the dancer rolls
31A and 31B. A slip of the yarn Y may occur as a result of increasing the traversal
speed. However, the position of the dancer roll 31 is controlled by decreasing the
traversal speed as above, and therefore the slip of the yarn Y is avoidable.
[0063] Furthermore, in the present embodiment, the controller 20 is configured to perform
processing of the positional difference eliminating control within the time period
of a single reciprocation cycle in which the traverse unit 19 reciprocates the yarn
Y once in the traverse direction. Long-term execution of the positional difference
eliminating control, in which the traversal speed is changed, may misshape the package
P. Performing the processing of the positional difference eliminating control only
for the short period of time as described above ensures good quality of the packages
P.
[0064] Furthermore, in the present embodiment, the controller 20 is configured to perform
the positional difference eliminating control irrespective of whether or not the difference
of the positions PA and PB of the two dancer rolls 31A and 31B exceeds the threshold
PX (the controller 20 is configured to perform the forced positional difference eliminating
control) immediately before interchanging the positions of the two spindles 18 by
the turret 17 (switching device). When there is a large difference between the positions
PA and PB of the dancer rolls 31A and 31B at the time of cutting the yarns Y, there
is a possibility that variations in the timings of cutting the yarns Y occur, and/or
one or some of the yarns Y cannot be cut. Forcedly performing the positional difference
eliminating control immediately before the interchanging the positions of the spindles
18 as above enables cutting the yarns Y simultaneously.
[0065] Furthermore, in the present embodiment, the controller 20 is configured to perform
the positional difference eliminating control irrespective of whether or not the difference
between the positions PA and PB of the two dancer rolls 31A and 31B exceeds the threshold
PX (the controller 20 is configured to perform the forced positional difference eliminating
control) immediately after the yarns Y are cut by the cutters 23 (cutting means).
Although in the present embodiment, the position PA, PB of the dancer roll 31A, 31B
is controllable by adjusting the traversal speed of the corresponding traverse unit,
it is preferable that the traversal speed is as constant as possible in order to improve
the quality of the packages P. Thus, forcedly performing the positional difference
eliminating control immediately after cutting the yarns Y as described above, i.e.,
at the time of starting the winding of the yarns Y onto empty bobbins B, minimizes
the necessity to change the traversal speed during the winding process.
[0066] Furthermore, in the present embodiment, the controller 20 is capable of changing
the traverse widths of the traverse units 19. This advantageous feature is described
with reference to FIG. 6. FIG. 6 is a schematic diagram illustrating the change in
the winding width with a change in the traversal speed. FIG. 6 shows a development
view of a package P on a sheet. At normal winding times during which no positional
difference eliminating control is performed, the traverse guide 19a reciprocates at
a traversal speed V1 and a traverse width W1, and draws a trajectory S1, which is
indicated with a dashed line. Between the traverse guide 19a and the outer circumferential
surface of the package P, the yarn Y has a part which does not follow the traverse
guide 19a at the time of turnaround of the traverse guide 19a, the part being so called
"free length". Due to this, when the traverse guide 19a turns around, the wound yarn
Y turns back at a point inward of the trajectory of the traverse guide 19a, as indicated
with bold solid lines in FIG. 6. That is to say, the actual winding width X1 is shorter
than the traverse width W1. Taking the above phenomenon into consideration, the traversal
speed V1 and the traverse width W1 are determined beforehand so that the winding width
X1 is equal to a desired value.
[0067] Now, when the traversal speed is decreased to V2 while keeping the traverse width
at W1 in the positional difference eliminating control, the trajectory of the traverse
guide 19a changes to S2, as indicated with two-dot chain line. The decrease of the
traversal speed makes it easier for the yarn Y to follow the traverse guide 19a at
the time of turnaround of the traverse guide 19a, and therefore the winding width
X2 in this situation is longer than the winding width X1 of the normal winding times.
To the contrary, when the traversal speed is increased, the winding width becomes
shorter than the winding width X1 of the normal winding times, though it is not illustrated.
Thus, the actual winding width changes with the change of the traversal speed. Accordingly,
in the above-described arrangement in which the traverse width of each traverse unit
19 is changeable, it is possible to keep the winding width constant by adjusting the
traverse width depending on the change of the traversal speed.
[0068] For example, in the present embodiment, it is preferable that when decreasing the
traversal speed of one or more of the traverse units 19, the controller 20 decreases
the traverse widths of the one or more traverse units 19. As described above, the
slip of the yarn Y is avoidable by decreasing the traversal speed to control the position
of the dancer roll 31. However, the decrease of the traversal speed makes the actual
winding width longer, which may lead to cob-webbing. To deal with this, the traverse
width is decreased to be shorter than W1 at the same time when the traversal speed
is decreased. This makes it possible to maintain the winding width constant at X1,
while avoiding the slip of the yarn Y.
[0069] Furthermore, in the present embodiment, the controller 20 is configured to perform
the winding speed control of moving the positions of the dancer rolls 31A and 31B
by adjusting the rotation number of the spindle 18. Performing the winding speed control
makes it possible to control the position of the dancer roll 31A, 31B not only by
adjusting the traversal speed, but also by adjusting the rotation number of the spindle
18.
[0070] Furthermore, in the present embodiment, the controller 20 is configured to adjust
the rotation number of the spindle 18 so that one of the dancer rolls 31A and 31B
moves to the reference position PO in the winding speed control. With this winding
speed control, one of the dancer rolls (dancer roll 31A or 31B) is moved to the reference
position PO. Due to this, merely by performing the positional difference eliminating
control for the other of the dancer rolls (dancer roll 31B or 31A) so as to reduce
the difference between the positions PA and PB of the dancer rolls 31A and 31B, it
is possible to keep all the dancer rolls 31A and 31B at the reference position PO.
[0071] Furthermore, in the present embodiment, the controller 20 adjusts, in the winding
speed control, the rotation number of the spindle 18 so that the lowest one of the
dancer rolls 31A and 31B moves to the reference position PO. When the winding speed
control is performed so that the lowest one of the dancer rolls (dancer roll 31A or
31B) moves to the reference position PO, the other one of the dancer rolls (dancer
roll 31B or 31A) shall be positioned higher than the reference position PO. When performing
the positional difference eliminating control to the other one of the dancer rolls
(dancer roll 31B or 31A) so as to reduce the difference from the position (PA or PB)
of the one of the dancer rolls (dancer roll 31A or 31B), the traversal speed shall
be decreased. Accordingly, the slip of the yarn Y is avoidable, as described above.
(Other Embodiments)
[0072] While the above-described embodiment deals with an example of the positional control
of the dancer rolls 31, the specific contents of the control are not limited to those
described in the above embodiment. For example, in the winding speed control, one
of the dancer rolls 31 which has been selected beforehand may be moved to the reference
position PO, or the rotation number of the spindle 18 may be adjusted so that the
average position of the plurality of dancer rolls 31 is level with the reference position
PO. Furthermore, in the positional difference eliminating control, the dancer roll(s)
31 to be moved is changeable as needed, and two or more dancer rolls 31 may be moved
at the same time, that is, the traversal speeds of two or more traverse units 19 may
be changed at the same time.
[0073] The winding speed control and the positional difference eliminating control in another
embodiment are described with reference to FIG. 7 and FIG. 8. In the winding speed
control of the other embodiment, the rotation number of the spindle 18 is adjusted
so that the dancer roll 31A is returned to the reference position PO. First of all,
the controller 20 obtains the position PA of the dancer roll 31A, which is detected
by the position sensor 34A (Step S40). Then, the controller 20 determines whether
the position PA of the dancer roll 31A is higher than the reference position PO (Step
S41). When the position PA of the dancer roll 31A is higher than the position PO (Step
S41: YES), the controller 20 reduces the rotation number of the spindle 18 so as to
lower the position PA of the dancer roll 31A to the reference position PO (Step S42),
and the processing of the winding speed control ends. When the result of the determination
in Step S41 is NO, the controller 20 determines whether the position PA of the dancer
roll 31A is lower than the reference position PO (Step S43). When the result of the
above determination shows that the position PA of the dancer roll 31A is lower than
the reference position PO (Step S43: YES), the controller 20 increases the rotation
number of the spindle 18 so as to raise the position PA of the dancer roll 31A to
the reference position PO (Step S44), and the processing of the winding speed control
ends. When the result of the above determination in Step S43 is NO, the result shows
that the position PA of the dancer roll 31A is level with the reference position PO,
and therefore the processing of the winding speed control ends without changing the
rotation number of the spindle 18.
[0074] In the positional difference eliminating control of the other embodiment, when there
is a large difference between the position PA of the dancer roll 31A and the position
PB of the dancer roll 31B, the traversal speed of the traverse unit 19B is adjusted
so as to move the dancer roll 31B to the reference position PO. First of all, the
controller 20 obtains the positions PA and PB of the dancer rolls 31A and 31B, which
are respectively detected by the position sensors 34A and 34B (Step S50). Then, the
controller 20 determines whether the difference between the position PA of the dancer
roll 31A and the position PB of the dancer roll 31B is within (equal to or smaller
than) a predetermined threshold PX (Step S51). When the difference between the position
PA of the dancer roll 31A and the position PB of the dancer roll 31B is equal to or
smaller than the threshold PX (Step S51: YES), the processing of the positional difference
eliminating control ends without changing the traversal speed of any of the traverse
units 19A and 19B.
[0075] Meanwhile, when the difference between the position PA of the dancer roll 31A and
the position PB of the dancer roll 31B exceeds the threshold PX (Step S51: NO), the
controller 20 determines whether the position PB of the dancer roll 31B is higher
than the reference position PO (Step S52). When the result of the above determination
shows that the position PB of the dancer roll 31B is higher than the reference position
PO (Step S52: YES), the controller 20 decreases the traversal speed of the traverse
unit 19B for a predetermined period of time so as to lower the position PB of the
dancer roll 31B to the reference position PO (Step S53). Then, the controller 20 returns
the traversal speed of the traverse unit 19B back to its original speed (Step S54),
and the processing of the positional difference eliminating control ends. Meanwhile,
when the result of the determination in Step S52 is NO, the controller 20 increases
the traversal speed of the traverse unit 19B for a predetermined period of time so
as to raise the position PB of the dancer roll 31B to the reference position PO (Step
S55). Then, the controller 20 returns the traversal speed of the traverse unit 19B
back to its original speed (Step S56), and the processing of the positional difference
eliminating control ends.
[0076] Thus, the positional control of the dancer rolls 31 of the other embodiment is arranged
such that: the winding speed control is made so as to move the dancer roll 31A to
the reference position PO; and the positional difference eliminating control is made
so as to move the dancer roll 31B to the reference position PO. That is, the dancer
roll to be controlled is fixed in each control processing, and this simplifies the
positional control.
[0077] In the above-described embodiment, the yarn winder 1 is configured so that each common
spindle 18 supports two bobbins (packages P). In this regard, however, three or more
bobbins B (packages P) may be supported by one spindle 18.
[0078] Furthermore, while in the above-described embodiments, the reference position PO
of the dancer rolls 31 is defined as a predetermined position, the reference position
PO may be defined as a predetermined range.
1. Fadenwickler (1), einschließlich mindestens einer gemeinsamen Spindel (18), jeweils
konfiguriert, um eine Vielzahl von Spulen (B) zu stützen, wobei der Fadenwickler (1)
konfiguriert ist, um die Spindel zum Aufwickeln von Fäden (Y) auf die jeweiligen Spulen
(B) zu drehen, um Packungen (P) zu bilden, wobei der Fadenwickler (1) umfasst:
Changiereinheiten (19), die konfiguriert sind, um die jeweiligen Fäden (Y) zu changieren;
Tänzerwalzen (31), auf welche die Fäden (Y) jeweils gewickelt werden, wobei jede der
Tänzerwalzen (31) konfiguriert ist, um von einer vorbestimmten Referenzposition zu
einer Entspannungsseite beweglich zu sein, auf der ein entsprechender der Fäden (Y)
entspannt wird und in Richtung einer Spannungsseite, auf der Fadenlockerungen entfernt
werden;
Positionsdetektoren (34), die konfiguriert sind, um jeweilige Positionen der Tänzerwalzen
(31) zu erkennen; und
eine Steuereinheit (20), die konfiguriert ist, um eine Position von mindestens einer
der Tänzerwalzen (31) basierend auf Ausgaben von den Positionsdetektoren (34) durch
Einstellen der Changiergeschwindigkeit von mindestens einer entsprechenden der Changiereinheiten
(19), die den Faden changieren, der auf die mindestens eine der Tänzerwalzen (31)
gewickelt ist, zu steuern,
dadurch gekennzeichnet, dass,
wenn eine Differenz zwischen Positionen von frei ausgewählten zwei der Tänzerwalzen
(31) einen vorbestimmten Schwellenwert überschreitet, die Steuereinheit (20) eine
Positionsdifferenz-Beseitigungssteuerung des Reduzierens der Differenz zwischen den
Positionen der zwei Tänzerwalzen (31) auf ein Niveau gleich oder kleiner als dem Schwellenwert
durch Einstellen der Changiergeschwindigkeit von mindestens einer von zwei Changiereinheiten
(19) durchführt, welche die Fäden (Y), die auf die zwei Tänzerwalzen (31) gewickelt
sind, changieren.
2. Fadenwickler (1) nach Anspruch 1, wobei in der Positionsdifferenz-Beseitigungssteuerung
die Steuereinheit (20) konfiguriert ist, um die Changiergeschwindigkeit einer entsprechenden
der zwei Changiereinheiten (19) zu verringern, die den Faden changiert, der auf eine
entspannungsseitige Tänzerwalze der zwei Tänzerwalzen (31) gewickelt ist, wobei sich
die entspannungsseitige Tänzerwalze auf der Entspannungsseite bezüglich der anderen
Tänzerwalze befindet.
3. Fadenwickler (1) nach Anspruch 1 oder 2, wobei die Steuereinheit (20) konfiguriert
ist, um eine Verarbeitung der Positionsdifferenz-Beseitigungssteuerung innerhalb einer
Zeitperiode eines einzelnen Hin- und Herbewegungszyklus durchzuführen, in dem die
Changiereinheit (19) den Faden in eine Changierrichtung einmal hin- und herbewegt.
4. Fadenwickler (1) nach einem der Ansprüche 1 bis 3, bei dem die mindestens eine Spindel
zwei Spindeln einschließt, wobei der Fadenwickler (1) weiter umfasst:
eine Schaltvorrichtung (17), die konfiguriert ist, um die zwei Spindeln zu stützen,
so dass Positionen der zwei Spindeln zwischen einer Wickelposition, in der die Fäden
(Y) jeweils auf die Spulen (B) gewickelt werden, und einer Sammelposition, in der
die Packungen (P) gesammelt werden, untereinander austauschbar sind; und
eine Vielzahl von Schneidemitteln (23), die konfiguriert ist, um jeweils die Fäden
(Y) zu schneiden, die zu den Packungen (P) führen, die von der Spindel gestützt werden,
die durch die Schaltvorrichtung (17) von der Wickelposition in die Sammelposition
bewegt wurde, wobei
die Steuereinheit (20) konfiguriert ist, um die Positionsdifferenz-Beseitigungssteuerung
unmittelbar vor einem Austauschen der Positionen der zwei Spindeln durch die Schalteinrichtung
(17) durchzuführen, unabhängig davon, ob die Differenz zwischen den Positionen der
zwei Tänzerwalzen (31) den Schwellenwert überschreitet oder nicht.
5. Fadenwickler (1) nach Anspruch 4, wobei die Steuereinheit (20) konfiguriert ist, um
die Positionsdifferenz-Beseitigungssteuerung unmittelbar nach einem Schneiden der
Fäden (Y) durch die Vielzahl von Schneidemitteln (23) durchzuführen, unabhängig davon,
ob die Differenz zwischen den Positionen der zwei Tänzerwalzen (31) den Schwellenwert
überschreitet oder nicht.
6. Fadenwickler (1) nach einem der Ansprüche 1 bis 5, wobei die Steuereinheit (20) imstande
ist, die Changierbreiten der Changiereinheiten (19) zu ändern.
7. Fadenwickler (1) nach Anspruch 6, wobei beim Verringern der Changiergeschwindigkeiten
einer oder mehrerer der Changiereinheiten (19) die Steuereinheit (20) konfiguriert
ist, um die Changierbreiten der einen oder mehreren Changiereinheiten (19) zu verringern.
8. Fadenwickler (1) nach einem der Ansprüche 1 bis 7, wobei die Steuereinheit (20) konfiguriert
ist, um eine Wickelgeschwindigkeitssteuerung des Bewegens der Positionen der Tänzerwalzen
(31) durch Einstellen einer Drehzahl der Spindel durchzuführen.
9. Fadenwickler (1) nach Anspruch 8, wobei bei der Wickelgeschwindigkeitssteuerung die
Steuereinheit (20) konfiguriert ist, um die Drehzahl der Spindel einzustellen, so
dass eine der Tänzerwalzen (31) zur Referenzposition bewegt wird.
10. Fadenwickler (1) nach Anspruch 9, wobei bei der Wickelgeschwindigkeitssteuerung die
Steuereinheit (20) konfiguriert ist, um die Drehzahl der Spindel einzustellen, so
dass von den Tänzerwalzen (31) die Tänzerwalze (31), die von der Referenzposition
am weitesten entfernt auf der Spannungsseite positioniert ist, zur Referenzposition
bewegt wird.
1. Enrouleur de fils (1) incluant au moins une broche commune (18) configurée chacune
pour supporter une pluralité de bobines (B), l'enrouleur de fils (1) étant configuré
pour faire tourner la broche afin d'enrouler des fils (Y) sur les bobines (B) respectivement
pour former des paquets (P), l'enrouleur de fils (1) comprenant :
des unités de traversée (19) configurées pour traverser les fils (Y) respectivement
;
des rouleaux danseurs (31) sur lesquels les fils (Y) sont respectivement enroulés,
chacun des rouleaux danseurs (31) étant configuré pour être mobile depuis une position
de référence prédéterminée vers un côté relâchement sur lequel un correspondant des
fils (Y) est relâché et vers un côté tension sur lequel un mou de fil est éliminé
;
des détecteurs de position (34) configurés pour détecter des positions des rouleaux
danseurs (31), respectivement ; et
un dispositif de commande (20) configuré pour commander une position d'au moins un
des rouleaux danseurs (31) sur la base de sorties des détecteurs de position (34)
en ajustant une vitesse de traversée d'au moins une correspondante des unités de traversée
(19) traversant le fil enroulé sur l'au moins un des rouleaux danseurs (31),
caractérisé en ce que
quand une différence entre des positions de deux des rouleaux danseurs (31) librement
sélectionnés dépasse un seuil prédéterminé, le dispositif de commande (20) effectue
une commande d'élimination de différence positionnelle de réduction de la différence
entre les positions des deux rouleaux danseurs (31) à un niveau égal ou inférieur
au seuil en ajustant la vitesse de traversée d'au moins une de deux unités de traversée
(19) traversant les fils (Y) enroulés sur les deux rouleaux danseurs (31).
2. Enrouleur de fils (1) selon la revendication 1, dans lequel, lors de la commande d'élimination
de différence positionnelle, le dispositif de commande (20) est configuré pour diminuer
la vitesse de traversée d'une correspondante des deux unités de traversée (19) qui
traverse le fil enroulé sur un rouleau danseur côté relâchement des deux rouleaux
danseurs (31), le rouleau danseur côté relâchement étant sur le côté relâchement par
rapport à l'autre rouleau danseur.
3. Enrouleur de fils (1) selon la revendication 1 ou 2, dans lequel le dispositif de
commande (20) est configuré pour effectuer un traitement de la commande d'élimination
de différence positionnelle dans une période de temps d'un unique cycle de va-et-vient
dans lequel l'unité de traversée (19) anime le fil d'un mouvement de va-et-vient une
fois dans une direction de traversée.
4. Enrouleur de fils (1) selon l'une quelconque des revendications 1 à 3, dans lequel
l'au moins une broche inclut deux broches, l'enrouleur de fils (1) comprenant en outre
:
un dispositif de commutation (17) configuré pour supporter les deux broches de telle
sorte que des positions des deux broches sont interchangeables l'une avec l'autre
entre une position d'enroulement dans laquelle les fils (Y) sont respectivement enroulés
sur les bobines (B) et une position de collecte dans laquelle les paquets (P) sont
collectés ; et
une pluralité de moyens de coupe (23) configurés pour respectivement couper les fils
(Y) menant aux paquets (P) supportés par la broche ayant été déplacés de la position
d'enrouement à la position de collecte par le dispositif de commutation (17), dans
lequel
le dispositif de commande (20) est configuré pour effectuer la commande d'élimination
de différence positionnelle juste avant le changement des positions des deux broches
par le dispositif de commutation (17), que la différence entre les positions des deux
rouleaux danseurs (31) dépasse le seuil ou non.
5. Enrouleur de fils (1) selon la revendication 4, dans lequel le dispositif de commande
(20) est configuré pour effectuer la commande d'élimination de différence positionnelle
juste après que les fils (Y) ont été coupés par la pluralité de moyens de coupe (23),
que la différence entre les positions des deux rouleaux danseurs (31) dépasse le seuil
ou non.
6. Enrouleur de fils (1) selon l'une quelconque des revendications 1 à 5, dans lequel
le dispositif de commande (20) est capable de changer des largeurs de traversée des
unités de traversée (19).
7. Enrouleur de fils (1) selon la revendication 6, dans lequel lors de la diminution
des vitesses de traversée d'une ou de plusieurs des unités de traversée (19), le dispositif
de commande (20) est configuré pour diminuer les largeurs de traversée des une ou
plusieurs unités de traversée (19).
8. Enrouleur de fils (1) selon l'une quelconque des revendications 1 à 7, dans lequel
le dispositif de commande (20) est configuré pour effectuer une commande de vitesse
d'enroulement de déplacement des positions des rouleaux danseurs (31) en ajustant
un nombre de rotations de la broche.
9. Enrouleur de fils (1) selon la revendication 8, dans lequel lors de la commande de
vitesse d'enroulement, le dispositif de commande (20) est configuré pour ajuster le
nombre de rotations de la broche de telle sorte que l'un des rouleaux danseurs (31)
est déplacé jusqu'à la position de référence.
10. Enrouleur de fils (1) selon la revendication 9, dans lequel lors de la commande de
vitesse d'enroulement, le dispositif de commande (20) est configuré pour ajuster le
nombre de rotations de la broche de telle sorte que parmi les rouleaux danseurs (31),
le rouleau danseur (31) positionné le plus loin sur le côté tension par rapport à
la position de référence est déplacé jusqu'à la position de référence.