Field of the Invention
-
The present invention relates to the configuration of a device that operates
in an automatic winder having a plurality of winding units, to unload a full
package doffed by each winding unit.
Background of the Invention
-
The Examined Japanese Patent Application Publication (Tokkou-Hei) No. 1-46428
(Figure 2; 3rd column, 11th to 28th lines; for the stock bar, 3rd column, 39th line
and below and fifth column, 24th and subsequent lines; for the plurality of
sections, 7-th column, 18-th and subsequent lines) discloses the configuration of
a full package unloading device of this kind. Figure 2 in the Examined Japanese
Patent Application Publication (Tokkou-Hei) No. 1-46428 shows that in an automatic
winder having a large number of winding units arranged in a line, a conveyor is
extended along the winding unit. The figure also shows that a stock bar
(corresponding to a shutter) is provided between the conveyor and a position where
a full package leaves a cradle portion of each winding unit. When a doffing
operation is performed to separate the full package from the cradle portion, the
full package is stopped at the position of the stock bar. The full package is then
remains stocked for a predetermined time. Then, at a predetermined time set in
a timer, the stock bar is opened. All the full packages stocked in the respective
winding units are simultaneously supplied to the conveyor. Consequently, a large
number of full packages can be efficiently conveyed by driving the conveyor once
for a short time.
-
The Examined Japanese Patent Application Publication (Tokkou-Hei) No. 1-46428
also discloses a configuration used for a single automatic winder divided into
sections for respective units and in which different types of yarns are wound in
the respective sections. In this configuration, a stock bar is provided and
operated independently for each section.
-
Moreover, the Examined Japanese Patent Application Publication (Tokkou-Hei)
No. 2-12869 (Figure 6; Claim 1; 8th column, 18th and subsequent lines) discloses
a configuration in which a stock bar is provided for each winding unit group so
that different types of yarn supplying packages are obtained from the respective
groups. In this configuration, each stock bar is opened at specified time
intervals on the basis of a timer provided for each winding unit group. This
allows different types of full packages to be unloaded at the respective times,
while allowing the same type of full packages to be simultaneously unloaded. It
is thus possible to prevent different types of packages from being mixed at an
outlet of the conveyor.
-
However, in both configurations according to the Examined Japanese Patent
Application Publication (Tokkou-Hei) No. 1-46428 and the Examined Japanese Patent
Application Publication (Tokkou-Hei) No. 2-12869, the stock bar (shutter) is
opened on the basis of the timer. Accordingly, it is necessary to set, in the
timer, such time intervals as enable a large number of full packages to be
efficiently conveyed along the conveyor without reducing the operating efficiency
of the winging units. To achieve this, it is necessary to set the optimum shutter
opening time intervals for the average time required to obtain full packages.
However, since the wind-up time varies with certain conditions such as the
thicknesses of wound yarns, it is cumbersome to set or adjust the wind-up time.
-
As described above, since the average wind-up time varies with certain
conditions such as yarn types, the standard wind-up time varies with the unit
groups according to the Examined Japanese Patent Application Publication
(Tokkou-Hei) No. 2-12869. In this connection, in the Examined Japanese Patent
Application Publication (Tokkou-Hei) No. 2-12869, the stock bar opening timing is
varied with the winding unit groups in order to avoid the mixture of different
types of packages. However, the same opening time intervals are used for each unit
group (Figure 8 in the Examined Japanese Patent Application Publication
(Tokkou-Hei) No. 2-12869). Accordingly, in some winding unit groups, the stock
bar is opened before a large number of full packages have been stocked. This
prevents the efficient conveyance of full packages along the conveyor. In other
winding unit groups, a very long time needs to pass before it is possible to start
to unload full packages stocked to the conveyor. This may prevent full packages
around the cradle portions from being doffed, thus reducing operating efficiency.
Summary of the Invention
-
A description has been given of the problems to be solved by the present
invention. Now, a description will be given of means for solving these problems
and the effects of the means.
- (1) According to an aspect of the present invention, there is provided a full
package unloading device for an automatic winder configured as described below.
The full package unloading device comprises a conveyor extended along a direction
in which a large number of winding units are arranged in a line, a guide path along
which a full package is guided from a cradle portion of each winding unit to the
conveyor, a shutter provided in the guide path and which can be switched between
a closed state in which the full package is inhibited from moving to the conveyor
and an open state in which the full package is allowed to move, and a winding
progress sensor that detects whether or not winding on the winding package at the
cradle portion has progressed to a predetermined level. Each winding unit is
configured to generate a shutter open request signal while the full package in the
guide path is stopped by the shutter closed and when the winding progress sensor
detects that winding on the winding package at the cradle portion has progressed
to the predetermined level. The full package unloading device is further provided
with a control device that controllably switches the shutter from the closed state
to the open state when the winding unit generates the shutter open request signal.
With this configuration, when winding on the winding package at the cradle
portion has progressed to the predetermined level, the winding progress sensor
detects this, and at this time, if the full package in the guide path is stopped
by the shutter, the winding process sensor generates a shutter open request to open
the shutter. This relieves an operator from a cumbersome operation of setting
shutter opening time intervals in a timer as shown in Examined Japanese Patent
Application Publication (Tokkou-Hei) No. 1-46428. Further, even if any condition
such as the type of the yarn is changed to vary a standard wind-up time, the timer
set value need not be changed. Therefore, this effect is particularly marked when
for example, the automatic winder is operated while frequently changing the type
of the yarn.
- (2) The full package unloading device for an automatic winder is preferably
configured as follows. The shutter is provided in association with each of a
plurality of winding unit groups. When one of the winding units generates the
shutter open request signal, the control device controllably switches the shutter
corresponding to the winding unit group to which the winding unit belongs between
the closed state to the open state.
With this configuration, the shutter is opened and closed for each winding
unit group. This prevents the mixture of full packages unloaded from different
winding unit groups.
- (3) The full package unloading device for an automatic winder is preferably
configured to wind different types of yarns in respective the winding unit groups.
This configuration can prevent the mixture of full packages into which
different types of yarns have been wound, while relieving the operator from the
cumbersome operation of setting shutter opening time intervals in the timer as
shown in the Examined Japanese Patent Application Publication (Tokkou-Hei) No.
1-46428 and the Examined Japanese Patent Application Publication (Tokkou-Hei) No.
2-12869. Moreover, since the respective winding unit groups use different yarns,
the average wind-up time often varies with the winding unit groups. However,
according to the present invention, when the shutter needs to be opened in a
certain winding unit group, it is opened regardless of the order of opening or the
time intervals. This improves the operating efficiencies of the winging units and
of the conveyor.
- (4) The full package unloading device for an automatic winder is preferably
configured as follows. The winding unit has a drum that rotates in contact with
the winding package at the cradle portion at a fixed speed. The winding progress
sensor is a rotation sensor that detects rotation of the drum.
With this configuration, the rotation sensor can detect rotation of the drum
while the yarn is being wound. Counting the rotation makes it possible to
determine how the winding has progressed. This eliminates the need for a special
sensor for detecting the progress of the winding. The configuration of the device
can thus be simplified.
- (5) The full package unloading device for an automatic winder is preferably
configured as follows. The winding unit has a control section. The control
section sets a package standby flag when a doffing operation is performed to remove
the full package from the cradle portion, and generates the shutter open request
signal when the winding progress sensor detects that winding on the winding package
at the cradle portion has progressed to the predetermined level while the package
standby flag remains set. The control section further resets the package standby
flag in response to a shutter operation signal from the control device.
With this configuration, it is possible to determine that the full package
is stopped (stocked), on the basis of the package standby flag, provided by
software. This eliminates the need for a special sensor for determining whether
or not there is any full package stocked. The configuration of the device can thus
be simplified.
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Brief Description of the Drawings
-
- Figure 1 is a perspective view showing an automatic winder to which a full
package unloading device according to the present invention is applied.
- Figure 2 is a vertical sectional view of the automatic winder.
- Figure 3 is a schematic plan view of the automatic winder.
- Figure 4 is a block diagram showing the electric configuration of the
automatic winder.
- Figure 5 is a flowchart showing control performed by each winding unit.
- Figure 6 is a flowchart showing control performed by a package shutter
conveyor device in the automatic winder.
-
Detailed Description of the Preferred Embodiments
-
Now, an embodiment of the present invention will be described.
-
In Figures 1 and 3, an automatic winder 1 has a large number of (in the present
embodiment, 60) winding units 2 arranged in a line in a longitudinal direction of
a frame. As shown in Figure 2, each winding unit 2 comprises a cradle portion 4
that supports a winding package 3 and a traversing drum 6 that contacts and rotates
the winding package 3 while traversing a yarn 5 from a yarn supplying package 19.
-
As shown in Figure 3, the 60 winding units are sequentially numbered from 1
to 60 starting with the one located at one end of the frame (#1 to #60). The 60
winding units are divided into two winding unit groups G1 and G2 so that the winding
units #1 to #40 belong to the first group G1, while the winding units #41 to #60
belong to the second group G2. Different types of yarn supplying packages 19 are
set for the first group G1 and for the second group G2 so that different types of
yarns 5 can be wound.
-
As shown in Figure 2, a conveyor 7 is provided behind the winding unit 2 (the
yarn 5 runs in front of the winding unit 2). As shown in Figures 1 and 3, the
conveyor 7 is disposed so as to extend along the direction in which the winding
units 2 are arranged in a line. Each winding unit 2 is provided with a guide path
8 along which the full package 3 removed from the cradle portion 4 is guided to
the conveyor 7. As shown in Figure 2, the guide path 8 is composed of a bottom
plate 9 and side plates 10. The bottom plate 9 is slightly inclined so that the
full package 3 having left the cradle portion 4 can roll and move to the conveyor
7 under its own weight.
-
As shown in Figure 3, a lifter 41 is provided at a terminal of the conveyor
7 in a conveying direction. An overhead conveyor 43 with a plurality of hooks 42
is disposed above the lifter 41. With this configuration, the full package 3
unloaded using the conveyor 7 can then be conveyed using the overhead conveyor 43.
-
As shown in Figure 3, the guide path 8 is provided with a shutter device 11
that temporarily stops the full package 8 leaving the cradle portion 4. The
shutter device 11 comprises a shutter 4 extended along the direction in which the
winding units 2 are arranged in a line and a fluid pressure cylinder 13 that
drivingly opens and closes the shutter 12.
-
The shutter 12 is configured to be pivotable around a rotationally moving
shaft 14 parallel to the direction in which the winding units 2 are arranged in
a line. The shutter 12 also comprises a stop surface 15 that abuts against an
outer periphery of the full package 3 rolling along the guide path 8 and a rolling
surface 16 that allows the full package 3 to roll.
-
A cylinder rod of the fluid pressure cylinder 13 is pivoted to an appropriate
position of the shutter 12. The fluid pressure cylinder 13 is normally expanded
to project the stop surface 15 of the shutter 12 above the height of the bottom
plate 9 (closed state). On the other hand, when the fluid pressure cylinder 13
is contracted, the shutter 12 is rotationally moved downward to lower the stop
surface 15 below the height of the bottom plate 9. Further, the rolling surface
16 is joined to the bottom plate 9 so as to form a substantially continuous surface
(as shown by a chain line in Figure 2). In this open state, the full package 3
having rolled on the bottom surface 9 then rolls on the rolling surface 16. The
full package 3 can thus be moved onto the conveyor 7.
-
As shown in Figure 3, the shutter device 11 is configured to be able to open
and close the guide paths 8 for the 10 winding units 2 at a time. Six shutters
11 numbered from 1 to 6 are provided so that the shutter 11 No. 1 corresponds to
the winding units 2 Nos. 1 to 10, the shutter 11 No. 2 corresponds to the winding
units 2 Nos. 11 to 20, and so on. In connection with the winding unit groups G1,
G2, the shutter device 11 Nos. 1 to 4 correspond to the winding units (Nos. 1 to
40) of the first group G1. The shutter device 11 Nos. 5, 6 correspond to the
winding units (Nos. 41 to 60) of the second group G2. These correspondences are
stored in a RAM and so on of a higher control device 31 described later.
-
As shown in Figures 1 and 2, a guide bar 18 is extended alongside the conveyor
7. The guide bar 18 prevents the full package 3 having rolled on the bottom plate
9 and then on the rolling surface 16 from passing beyond and falling from the
conveyor 7.
-
As previously described, the one shutter 12 and the one fluid cylinder 13 are
provided for every 10 of the 60 winding units, and in total, the six shutters 12
and the six fluid cylinders 13 are provided. With this configuration, by placing
one of the shutters 12 in the closed position, it is possible to stock the 10 full
packages 3 at that shutter 12. Opening the shutter 12 enables the 10 full packages
to be simultaneously discharged to the conveyor 7.
-
A doffing operation for each winding unit 2 is performed by a doffing vehicle
21 shown in Figure 2. The doffing vehicle 21 is provided so as to hang from an
overhead rail 22 extended along the direction in which the winding units 2 are
arranged in a line. The doffing vehicle 21 can run along the overhead rail 22.
When the package at the cradle portion 4 of the winding unit 2 becomes full, a
control section 24 provides a doffing request signal. This causes the doffing
vehicle 21 to run to and stop in front of the winding unit 2. Then, a doffing
mechanism (not shown in the drawings) provided in the doffing vehicle 21 removes
the full package 3 from the cradle portion 4. The doffing mechanism further takes
one of the empty bobbins 17 stocked on a shelf 26 provided above the winding unit
2 and installs the empty bobbin 17 at the cradle portion 4. The doffing mechanism
further draws the yarn 5 out of the yarn supplying package 19. Then, a bunch
winding device (not shown in the drawings) is used to execute bunch winding on the
empty bobbin 17. This enables the winding unit 2 to restart winding.
-
The traversing drum 6 of the winding unit 2 comprises a driving motor 6a
containing a drum rotation sensor 23 serving as a winding progress sensor. The
rotation sensor 23 is configured to provide a pulse signal every time the drum 6
rotates. The control section 24 is electrically connected to the rotation sensor
23 and can count the pulse signals (rotation pulses) transmitted by the rotation
sensor 23.
-
Now, the electric configuration of the automatic winder 1 will be described
with reference to Figure 4. The control section 24 of the winding unit 2 is
composed of a well-known microcomputer. The control section 24 comprises a CPU
(arithmetic means), a ROM, a RAM, an EPROM and the like (storage means). The
control section 24 of each winding unit 2 stores, in the RAM, EPROM or the like,
one of the unit number 1, 2, ... which is assigned to the winding unit 2 and
information as to whether the winding unit belongs to the group G1 or the group
G2.
-
The control section 24 pre-stores the number of rotation pulses (hereinafter
referred to as a "full package count value") corresponding to the full package,
in the RAM, EPROM or the like as a set value. When the count value for pulse
signals from the rotation sensor 23 reaches the full package count value, the
control section 24 determines that the package in the winding unit has become full.
The control section 24 also pre-stores the number of rotation pulses (hereinafter
referred to as an "about-to-become-full package count value") corresponding to a
time when the winding has progressed to a certain level (for example, the winding
has been completed to about 90%), so that a few more windings make the package full.
The control section 24 can thus recognize this state as in the case of the full
package.
-
Moreover, as shown in Figure 4, the automatic winder 1 comprises a higher
control device 31 that generally controls the whole full package unloading device.
The higher control device 31 is also configured as a well-known microcomputer and
comprises a CPU (arithmetic means) a ROM, and a RAM (storage means) and the like.
The higher control device 31 is connected to the winding units 2 Nos. 1 to 60 via
signal lines to transmit and receive various signals. The RAM or the like of the
higher control device 31 pre-stores information as to whether each winding unit
2 belongs to the winding unit group G1 or the winding unit group G2 (group
assignment information).
-
The higher control device 31 is further connected to the six shutter devices
11, the conveyor 7, the doffing vehicle 21, and a yarn supplying package supplying
device 32. The higher control device 31 controllably causes the shutter 12 of the
shutter device 11 to be drivingly opened and closed, causes the doffing vehicle
21 to perform the above doffing operation, and causes the full package 3 on the
conveyor 7 to be unloaded.
-
Now, with reference to Figure 5, a description will be given of a flow for
the control section 24 of each of the winding units 2. The flow starts when the
package standby flag is off (S101). The package standby flag is a flag variable
for which a storage area is provided in the RAM or the like of the control section
24. The package standby variable can take two values, ON and OFF. The package
standby variable of ON indicates that the shutter device 11 has a full package 3
in stock. The package standby variable of OFF indicates that the shutter device
11 has no full package 3.
-
Then, in step S102, the traversing drum 6 is driven to unwind the yarn 5 from
the yarn supplying package 19. As previously described, during winding, the
control section 24 uses the rotation sensor 23 to detect rotation of the traversing
drum 6. Every time the control section 24 receives a pulse signal from the
rotation sensor 23, it counts up the value of a counter variable stored in the RAM
or the like. At a branch of step S103, the control section 24 checks whether or
not the winding has been completed to about 90%, that is, the counter variable has
reached the about-to-become-full package count value. If in step S103, the
control section 24 determines that the winding has not been completed to about 90%,
it executes processing following step S112, described later.
-
If in step S103, the control section 24 determines that the winding has been
completed to about 90%, it checks the contents of the package standby flag (S104).
If the content of the package standby flag is ON (that is, the shutter device 11
has a full package 3 in stock), the control section 24 sends a shutter open request
signal to the higher control device 31 (S105). Then, upon receiving a signal
indicating that the shutter is open (shutter operation signal), from the higher
control device 31 (S106), the control section 24 resets the package standby flag
to OFF (S107). If in step S104, the content of the package standby flag is OFF
(that is, the shutter device 11 has no full package 3 in stock), the processing
in steps S105 to S107 is skipped.
-
Then, the winding is continued until a full package is detected in step S108
(that is, the count value of the counter variable reaches the full package count
value). Once the package has become full, the rotation of the traversing drum 6
is immediately stopped to end the winding (S109). The control section 24 causes
the doffing vehicle 21 to perform a doffing operation (S110), and the package
standby flag is set to ON (S111). Subsequently, the control section 24 returns
to step S102 to cause the yarn 5 to be wound around a new bobbin.
-
If in step S103, the control section 24 determines that the winding has not
been completed to about 90%, it checks whether or not a shutter operation signal
has been received from the higher control device 31 (S112). If the shutter
operation signal has not been received, the control section 24 returns to step
S103. If the shutter operation signal has been received, the control section 24
checks the content of the package standby flag (S113). If the content of the
package standby flag is OFF, the control section 24 returns to step S112. If the
content of the package standby flag is ON, the control section 24 resets the flag
to OFF (S114), and the control section 24 then returns to step S103.
-
Now, control by the higher control device 31 will be described with reference
to the flowchart in Figure 6. The higher control device 31 is configured to
perform various types of control such as the control of the doffing vehicle 21 and
the control of the yarn supplying package supplying device 32. However, Figure
6 shows only the control relating to the unloading of the full package 3.
-
A description will be given with reference to Figure 6. First, in step S201,
the higher control device 31 checks whether or not the shutter open request signal
(signal transmitted by the winding unit 2 during the processing in step S105 in
Figure 5) has not been received. If the signal has not been received, the higher
control device 31 stands by until the signal is received.
-
If the shutter open request signal has been received, the higher control
device 31 checks whether or not the conveyor 7 is being driven (S202). If the
conveyor 7 is being driven, the higher control device 31 stands by until the
driving of the conveyor 7 has been finished (S203).
-
Then, in step S204, the higher control device 31 analyzes the shutter open
request signal to check the number of the winding unit 2 having transmitted the
signal. The higher control device 31 then checks whether the source winding unit
2 determined belongs to the winding unit group G1 or the winding unit group G2.
The higher control device 31 thus opens the shutter 12 of the shutter device 11
corresponding to the winding unit group G1 or the winding unit group G2 to which
the winding unit 2 belongs. Specifically, the above fluid pressure cylinder 13
is driven so that the shutter 12 remains open for a predetermined time (for
example, about several seconds) and is then closed. Thus, the full package 3
stocked by the shutter 12 is moved onto the conveyor 7.
-
Then, in step S205, the higher control device 31 transmits a shutter operation
signal to all the winding units 2 Nos. 1 to 60, indicating that the shutter
corresponding to the winding unit group has been driven. Then, the higher control
device 31 drives the conveyor 7 for a predetermined time to unload all the full
packages 3 on the conveyor 7 to the overhead conveyor 43 (S206). The series of
processes for the shutter open request signal are thus completed. The higher
control device 31 then returns to step S201 to stand by until a new shutter open
request signal is received.
-
The effects of the above control will be described below. It is assumed that
when the automatic winder 1 starts to be controlled, the shutters 12 of the six
shutter devices 11 are closed, with no full package 3 stocked at the position of
each shutter 12. It is further assumed that no full package 3 has been unloaded
to the conveyor 7, which is at a stop.
-
First, the processing in step S101 in Figure 5 is executed on the 60 winding
units 2 of each of the groups G1, G2. The package standby flag is set to OFF in
all of the 60 winding units 2.
-
Then, the 60 winding units 2 concurrently carry out winding (S102). Each
winding unit 2 counts signals from the rotation sensor 23 to monitor the progress
of yarn winding (S103). If the yarn winding has not been completed to 90%, the
control section 24 monitors whether or not a shutter operation signal has been
received (S112). When in step S103, the control section 24 senses that the yarn
winding has been completed to about 90%, it checks the content of the package
standby flag (S104). However, since the content of the package standby flag is
OFF at the start of the flow, the processing in steps S105 to S107 is not executed.
The shutter open request signal is not transmitted.
-
When the counter variable reaches the full package count value in one winding
unit 2 (for example, the winding unit 2 No. 42) (S108), the winding unit 2 No. 42
immediately stops winding (S109). The doffing vehicle 21 performs a doffing
operation (S110). The doffing causes the full package 3 to leave the cradle
portion 4 and then fall onto the guide path 8. The fallen full package 3 rolls
on the guide path 8, inclined as previously described, under its own weight.
However, since the higher control device 31 controllably places the shutter 12 of
the shutter device 11 in the closed position, the shutter 12 inhibits the full
package 3 from moving to the conveyor 7. The full package 3 is thus stopped.
After the doffing operation has been completed, the winding unit 2 No. 42 sets the
package standby flag to ON. That is, the package standby flag is set (S111).
Subsequently, the winding unit 2 No.42 executes winding on a new bobbin 17 (S102
and subsequent steps).
-
Similarly, when a full package is sensed in other winding units (for example,
Nos. 52, 15, ...) (S108), these winding units 2 stops winding. The doffing
operation is then performed on the winding units 2 (S109, S110). The shutter 12
closed stocks the full package 3. Subsequently, the winding units 2 Nos. 52, 15,
... set the package standby flag to ON (S111) and execute winding on a new bobbin
17 (S102 and subsequent steps).
-
Then, in the winding unit 2 No. 15, the winding on the new bobbin 17 is
completed to about 90%. In this case, the control section 24 of the winding unit
2 No. 15 detects that the counter variable has reached the about-to-become-full
package count value (S103). The control section 24 then checks the content of the
package standby flag (S104). The package standby flag has been ON since the
package in the last winding became full. Accordingly, the winding unit 2 No. 15
transmits a shutter open request signal to the higher control device 31 (S105).
The shutter open control signal contains information on the unit number of the
signal source (in this example, the winding unit 2 No. 15).
-
Upon receiving the shutter open request signal (S201 in Figure 6), the higher
control device 31 checks whether or not the conveyor 7 is being driven (S202).
Since the conveyor 7 is stopped at the start of operation, the higher control
device 31 shifts to the processing in step S204.
-
In step S204, the higher control device 31 analyzes the content of the shutter
open request signal to acquire the unit number of the source of the shutter open
request signal (that is, the shutter open requesting unit). This process enables
the higher control device 31 to recognize that the winding unit 2 No. 15 is
requesting that the shutter be opened. Then, the higher control device 31 checks
group assignment information pre-stored in the higher control device 31 to
determine whether the winding unit 2 No. 15 belongs to the winding unit group G1
or the winding unit group G2. The higher control device 31 can thus determine that
the winding unit 2 No. 15 belongs to the first group G1.
-
Then, the higher control device 31 controllably opens the shutter 12 of the
shutter device 11 belonging to the first group G1, and several seconds layer,
closes it again. In this case, only the target shutters 12 Nos. 1 to 4 remain open
for several seconds, while the shutters 12 Nos. 5, 6 remain closed. As a result,
the full packages 3 roll simultaneously onto the conveyor 7, and the full packages
3 have been removed from the cradle portions 4 of the winding units 2 Nos. 1 to
40 and then stocked by the shutters 12.
-
Then, the higher control device 31 transmits a shutter operation signal to
all the winding units 2 Nos. 1 to 60, indicating "that the shutters 12 in the first
group G1 have been completely driven" (S205). Upon receiving this signal (S112
in Figure 5), each winding unit 2 determines whether or not it belongs to the group
number (in this example, the first group G1) contained in the shutter operation
signal. If the winding unit 2 belongs to that group number, the winding unit 2
checks the content of the package standby flag (S113). If the content of the
package standby flag is ON, it is reset to OFF (S114). In this example, for all
the winding units 2 Nos 1 to 40 belonging to the first group G1, if the package
standby flag is ON, it is reset to OFF.
-
Moreover, the higher control device 31 drives the conveyor 7 for a specified
time in step S206 in Figure 6 to unload all the full packages 3, which have been
doffed by the winding units 2 belonging to the first group G1, to the overhead
conveyor 43 side.
-
Then, for example, for the winding unit 2 No. 42 (belonging to the second
group G2), if the winding on the empty bobbin 17 has been completed to about 90%
(S103 in Figure 5), then since the content of the package standby flag is ON (S104),
the winding unit 2 transmits a shutter open request signal as described above
(S105). Then, if the conveyor 7 has not been completely driven yet, the higher
control device 31 waits for the driving to be finished (S202, S203 in Figure 6).
The higher control device 31 then opens the shutter devices 11 Nos. 5, 6
corresponding to the second group G2 (S204). Thus, the full packages 3 doffed by
the winding units 2 Nos. 41 to 60 and then stocked by the shutters 12 are
simultaneously unloaded to the conveyor 7. The higher control device 31 then
transmits a shutter operation signal to all the winding units 2 Nos. 1 to 60,
indicating that "the shutters 12 in the second group G2 have been completely
driven" (S205). As a result, for all the winding units 2 Nos 1 to 60, if the
package standby flag is ON, it is reset to OFF.
-
The control has been specifically described. However, in each winding unit
2, the time at which the package becomes full may vary depending on various
conditions such as the number of times that yarn breakage occurs. Accordingly,
the timing for doffing may vary with the units even though the units simultaneously
start winding. However, in the present embodiment, the full packages 3 doffed are
once stopped and stocked by the shutters 12 closed. If any of the winding units
2 meets the above predetermined conditions (that is, the full package 3 in the
guide path 8 is stopped by the shutter 12 closed, that is, the package standby flag
is ON and the winding on the winding package 3 at the cradle portion 4 has been
completed to about 90%), the shutter 12 is opened. Consequently, the full
packages 3 can be simultaneously discharged from the winding unit group to which
the winding unit 2 belongs, to the conveyor 7.
-
If the full packages 3 are discharged directly to the conveyor 7 every time
a doffing operation is performed using a rough timing, packages rolling on the
guide path 8 after being doffed may collide against full packages 3 being conveyed
on the conveyor 7. The present embodiment can prevent such a trouble.
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Further, only the shutters 12 are opened which correspond to the winding unit
group to which the winding unit 2 belongs. This avoids the mixture of winding
packages 3 with different types of yarns.
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Moreover, with the configuration of the present embodiment, the rotation
sensor 23 detects the progress of winding. When the winding on the winding package
3 caused by the shutter 12 to stand by has been completed to about 90%, the control
section controllably transmits a shutter open request signal to open the shutter
12. That is, when a single doffing operation has been preformed to stock a full
package 3 at the shutter 12 and a package 3 at the cradle portion 4 is about to
become full (the winding has been completed to about 90%), a doffing operation may
have already been performed on almost all the other winding units 2 belonging to
the same winding unit group, with the full packages 3 stocked by the shutters 12.
Accordingly, by driving the shutter device 11 and the conveyor 7 once, it is
possible to efficiently convey a large number of full packages 3.
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Further, in contrast to the Examined Japanese Patent Application Publication
(Tokkou-Hei) No. 1-46428 and the Examined Japanese Patent Application Publication
(Tokkou-Hei) No. 2-12869, in which a timer is used to repeat an operation of
opening the shutter at predetermined time intervals, the present embodiment
eliminates the need for setting the timer so that optimum time intervals are
obtained. In particular, the recent need for more types and smaller quantity
makes it necessary to frequently change, for example, the type of the yarn 5 wound
in the automatic winder 1. This may correspondingly vary the average wind-up
time. However, even in this case, the present invention can omit a cumbersome
operation of changing the set value for the timer as required.
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The above control is suitable in the case where the winding units 2 are
divided into a plurality of groups (winding unit groups G1, G2) and where different
types of yarns 5 are wound in the winding unit groups G1, G2. That is, when
conditions such as the thickness of the yarn 5 wound vary with the groups, there
may be a difference in average wind-up time between the winding unit groups G1,
G2. The configuration in the Examined Japanese Patent Application Publication
(Tokkou-Hei) No. 2-12869 can only alternately discharge the winding unit groups
G1, G2 once. Consequently, depending on timings, the shutters 12 may be forcibly
opened with few full packages stocked at the shutters 12 or a delay may occur in
the opening of the shutters 12 to preclude the doffing operation, thus reducing
the serviceability ratio of the winding units 2. In contrast, in the present
embodiment, for the winding unit group to which the winding unit 2 on which winding
has been completed belongs, the shutters 12 are opened at any time regardless of
the order or time intervals. For example, if one G1 of the winding unit groups
is winding a thicker yarn 5 and requires a shorter wind-up time than the other
winding unit group G2, it is possible to controllably consecutively open the
shutters 12 corresponding to the winding unit group G1 twice. This makes it
possible to improve the conveying efficiency of the conveyor 7 and the
serviceability ratio of the winding units 2.
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Moreover, when the doffing device removes the full package 3 from the cradle
portion 4, the control section 24 of the winding unit 2 sets the package standby
flag to ON. Once the winding on the winding package 3 in the cradle portion 4 has
been completed to about 90% with the package standby flag set, the control section
24 generates the shutter open request signal. Then, upon receiving a shutter
operation signal from the higher control device 31, the control section 24 sets
the package standby flag to OFF (reset).
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This eliminates the need for providing the winding unit 2 with a sensor for
detecting whether or not any full package 3 is stocked at the position of the
shutter 12. The package standby flag provided by software can be used to determine
whether or not any full package 3 is in stock.
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The preferred embodiment of the present invention has been described.
However, the above configuration may be changed as described below.
- (1) The shutter 12 may be arbitrarily configured as long as it can switch the
state of the full package 3 passing through the guide path 8 between the one where
the movement of the full package 3 is inhibited and the one where the movement is
allowed. For example, it is possible to use shutters based on a stock bar system
such as the one disclosed in the Examined Japanese Patent Application Publication
(Tokkou-Hei) No. 2-12869.
- (2) In the above embodiment, the rotation sensor 23 is employed as a winding
progress sensor. Instead, it is possible to use a sensor that detects that the
diameter of the full package 3 has reached at least a predetermined value.
Alternatively, the sensor may be configured to detect the rotation of the full
package 3 per unit time. Alternatively, the control section may determine that
the package has become full or is about to become full when the rotation speed of
the winding package 3 decreases to a predetermined value. - (3) A sensor may be provided which detects the full package 3 stopped by the
shutter 12. However, it is more advantageous to use the package standby flag
provided by software to determine whether or not any full package 3 is in stock
as in the above embodiment. This configuration is simpler because it enables the
sensor to be omitted.
- (4) It is possible to arbitrarily determine the level of progress of the
winding on the package 3 in the cradle section 4 to be detected by the winding
process sensor (rotation sensor 23) (that is, the "predetermined level").
However, in view of an increase in the conveying efficiency of the conveyor 7, it
is not preferable to transmit a shutter open request signal in an earlier stage
of the winding. The winding progress sensor should detect that the winding has
been completed to at least about 50%. Moreover, if the sensor generates the
shutter open request signal upon sensing that the package is about to become full
(for example, the winding has been completed to 80 or 90%), more full packages 3
can preferably be simultaneously unloaded to the conveyor 7 by a performing single
operation of opening the shutters 12. - (5) In the example shown in the above embodiment, the winding units Nos. 1
to 60 are divided into the two winding unit groups G1, G2. However, more or less
winding units 2 may be used and the manner of the division may be appropriately
determined in accordance with the application of the automatic winder 1 or the
like. For example, the winding units 2 may be divided into three or more winding
unit groups.
- (6) Alternatively, all the 60 winding units 2 may simultaneously open and
close the shutters 12 rather than being divided into winding unit groups. This
configuration can also advantageously eliminate the need for a cumbersome
operation of setting the timer, in contrast to the configuration in the Examined
Japanese Patent Application Publication (Tokkou-Hei) No. 1-46428.
- (7) In the above embodiment, the shutter 12 is provided for every 10 winding
units 2, and the shutter 12 can simultaneously open and close the guide paths 8
in the 10 winding units 2. However, the present invention is not limited to the
10 winding units. For example, one shutter 12 may be provided for the 40 winding
units 2 Nos. 1 to 40, while one shutter 12 may be provided for the 20 winding units
2 Nos. 41 to 60. In short, it is only necessary to be able to substantially
simultaneously open and close the guide paths 8 in the winding units 2 belonging
to the same winding unit group and to independently open and close the guide paths
8 of the respective winding unit groups.
- (8) Control may be switched between an operation of opening the shutter 12
in response to a shutter open request signal from the winding unit 2 (first control
mode) and an operation of opening the shutter 12 using such a timer as shown in
Patent Document 1 or 2 (second control mode).
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