EP3567141A1

EP3567141A1 - Roving system and roving machine

Info

Publication number: EP3567141A1
Application number: EP19172442.6A
Authority: EP
Inventors: Takashi Hattori; Atsushi Kitamura
Original assignee: Toyota Industries Corp
Current assignee: Toyota Industries Corp
Priority date: 2018-05-11
Filing date: 2019-05-03
Publication date: 2019-11-13
Also published as: CN110468473A; JP2019196573A

Abstract

A roving system (100) contains a first roving machine (1A) and a second roving machine (1B, 1C). The first roving machine (1A) includes a first roving winding mechanism (40A), a tension sensor (37A), and a first control section (41A) that controls the operation of the first roving winding mechanism (40A) based on tension control data. The second roving machine (1B, 1C) includes a second roving winding mechanism (40B, 40C) having the same machine specification as the first roving winding mechanism (40A) to spin the same type of the roving (R), and a second control section (41B, 41C), but not the tension sensor (37A). A plurality of roving machines (1A, 1B, 1C) is connected through a network (42). The first roving machine (1A) further includes a transmission section (44A) whereas the second roving machine (1B, 1C) further includes a reception section (46B, 46C). The tension control data is sent from the transmission section (44A) to the reception section (46B, 46C) so that the second control section (41B, 41C) controls the operation of the second roving winding mechanism (40B, 40C) based on the tension control data.

Description

BACKGROUND ART

The present disclosure relates to a roving system and a roving machine.
In general, in a roving machine, a roving drawn out of a draft device is twisted with help of rotation of a flyer and rotation of a bobbin and wound on the bobbin. The bobbin is attached to a bobbin wheel so as to integrally rotate. The bobbin wheel and the bobbin are disposed on a bobbin rail so as to ascend and descend integrally with the bobbin rail. In this way, the roving is wound on the bobbin into a given form.
In the roving machine, the roving wound on the bobbin is relatively thick and soft. For this reason, if a great tension is applied to the roving drawn out of the draft device and fed into the flyer, the roving may easily be broken. On the other hand, if the tension applied to the roving is insufficient, the above given wound form of the roving may easily collapse while the roving is wound on the bobbin. To prevent this problem, some of the roving machines are equipped with tension sensors for detecting the tension of the roving. (Refer to Japanese Patent Application Publication No. 2008-274460 .) The roving machine equipped with the tension sensor is capable of spinning a roving in fine quality by controlling the winding operation of the roving based on tension data output from the tension sensor.
Tension sensors are costly because those sensors detect the tension of the roving with extremely high accuracy. In the case that a plurality of the roving machines having the same machine specification spins the same type of the roving, if the tension sensor is provided to each of the roving machines, the price of each of the roving machines is increased by addition of the price of the tension sensor.
The present disclosure has been made in view of the above circumstances and is directed to providing a roving system and roving machines for spinning a roving in fine quality at each of a plurality of roving machines having the same machine specification so as to spin the same type of the roving without providing a tension sensor to each roving machine.

SUMMARY

In accordance with an aspect of the present disclosure, there is provided a roving system including a first roving machine and a second roving machine. The first roving machine contains a first roving winding mechanism twisting a roving to wind the roving on a bobbin, a tension sensor detecting tension of the roving wound on the bobbin, and a first control section generating tension control data based on the tension data output from the tension sensor and controlling the operation of the first roving winding mechanism based on the tension control data. The second roving machine contains a second roving winding mechanism spinning the same type of the roving spun by the first roving machine and having the same machine specification as the first roving winding mechanism, and a second control section controlling the operation of the second roving winding mechanism. The second roving machine has no tension sensor. A plurality of the roving machines including the first roving machine and the second roving machine is connected to one another through a network. The first roving machine further contains a transmission section sending the tension data or the tension control data through the network. The second roving machine further contains a reception section receiving the tension data or the tension control data sent from the first roving machine through the network. The second control section controls operation of the second roving winding mechanism using the tension control data generated by the second control section based on the tension data received by the reception section, or using the tension control data received by the reception section.
In accordance with another aspect of the present disclosure, there is provided a roving system including a roving winding mechanism twisting a roving to wind the roving on a bobbin, a tension sensor detecting tension of the roving, a control section controlling the operation of the roving winding mechanism using tension control data generated by the control section based on tension data output from the tension sensor, and a transmission section sending the tension data or the tension control data to other machine through a network.
In accordance with the yet another aspect of the present disclosure, there is provided a roving system including a roving winding mechanism twisting a roving to wind the roving on a bobbin, a control section controlling the operation of the roving winding mechanism, and a reception section receiving data through a network. The reception section receives tension data output from the tension sensor provided to other machine for detecting tension of the roving or tension control data generated in the other machine based on the tension data, through the network. The control section controls the operation of the roving winding mechanism using the tension control data generated by the control section based on the tension data received by the reception section, or using the tension control data received by the reception section.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure, together with objects and advantages thereof, may best be understood by reference to the following description of the embodiments together with the accompanying drawings in which:

FIG. 1 is a schematic diagram illustrating a basic configuration of a roving machine according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram illustrating a configuration of a roving system according to a reference embodiment of the present disclosure;
FIG. 3 is a schematic diagram illustrating a configuration of a roving system according to the embodiment of the present disclosure;
FIG. 4 is a functional block diagram showing the roving system containing the roving machine configuration of the master machine and the roving machine configurations of the slave machines, according to the embodiment of the present disclosure;
FIG. 5 is a flow diagram showing the processing procedure of the roving machine serving as the master machine in the roving system according to the embodiment of the present disclosure; and
FIG. 6 is a flow diagram showing the processing procedure of the roving machine serving as the slave machine in the roving system according to the embodiment of the present disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

An embodiment of the present disclosure will be described in the following paragraphs with reference to the accompanying drawings.

FIG. 1 is a schematic diagram illustrating a basic configuration of a roving machine according to an embodiment of the present disclosure. A roving machine 1 includes a draft device 10 and a roving winding mechanism 40. The roving winding mechanism 40, including a flyer 12, a bobbin rail 16, and a bobbin wheel 17, twists a roving R drafted by the draft device 10 to wind on a bobbin B. A single unit of the roving machine 1 is provided with a plurality of spindles in the longitudinal direction of a machine. FIG. 1 illustrates one of the roving winding mechanisms 40 that constitutes one of the spindles.
The draft device 10 drafts a roving raw material to supply. The draft device 10 including a front roller 11 has a configuration in which the roving R is drawn out by rotation of the front roller 11.
The roving R supplied from the draft device 10 is fed into a flyer top 12a of the flyer 12. The flyer top 12a is disposed at the top of the flyer 12. The flyer 12 rotates so as to twist the roving R drawn out of the draft device 10 and wind the twisted roving R on the bobbin B. A driven gear 13 is fixed to an upper portion of the flyer 12. A driving gear 15 is engaged with the driven gear 13. When the driving gear 15 rotates, the rotating force of the bobbin rail 16 is transmitted to the driven gear 13. This allows the driven gear 13 to integrally rotate with the flyer 12.
A lifter rack 23 is fixed to the bobbin rail 16. A gear 24 is engaged with the lifter rack 23. The lifter rack 23 and the gear 24 are provided for ascending and descending the bobbin rail 16. The gear 24 is provided so as to be bidirectionaly rotatable. The lifter rack 23 ascends integrally with the bobbin rail 16 when the gear 24 rotates in one direction and descends integrally with the bobbin rail 16 when the gear 24 rotates in the other direction.
The bobbin wheel 17 detachably supports the bobbin B. The bobbin B attached to the bobbin wheel 17 integrally rotates with the bobbin wheel 17. The bobbin wheel 17 is provided at the bobbin rail 16. A driven gear 17a is fixed to the bobbin wheel 17. A driving gear 18 is engaged with the driven gear 17a. When the driving gear 18 rotates, the rotating force of the driving gear 18 is transmitted to the driven gear 17a. This allows the bobbin wheel 17 to integrally rotate with the driven gear 17a.
In the direction in which the roving R is drawn out, a tension sensor 37 is provided between the front roller 11 and the flyer top 12a. The tension sensor 37 disposed in a path from the front roller 11 to the flyer top 12a detects a position of the roving R, hereinafter referred to as a "roving position", by which the tension of the roving R is detected. The roving position is displaced upward when the tension of the roving R between the front roller 11 and the flyer top 12a relatively increases, whereas the roving position is displaced downward when the tension of the roving R relatively decreases. Therefore, by detecting the roving position of the tension sensor 37, the tension of the roving R is detected.
In the roving machine 1 having the above configuration, the roving R is drawn out of the draft device 10 by rotation of the front roller 11. The roving R drawn out of the draft device 10 is fed through the flyer top 12a to the flyer 12. On the other hand, the bobbin B is attached to the bobbin wheel 17 on the bobbin rail 16, and ascends integrally with the bobbin rail 16. As a result, the bobbin wheel 17 is placed inside the flyer 12.
Then, the flyer 12 rotates at a predetermined speed by rotation of the driving gear 15 and the driven gear 13. On the other hand, the bobbin B integrally rotates with the bobbin wheel 17 by rotation of the driving gear 18 and the driven gear 17a, where the bobbin B rotates faster than the flyer 12. As a result, the roving R is twisted by rotation of the flyer 12 and wound on the bobbin B by the difference in the rotational speed between the flyer 12 and the bobbin B. While the roving R is wound on the bobbin B, the bobbin B repetitively ascends and descends integrally with the bobbin rail 16. In this way, the roving R is wound into a given form on the bobbin B.
Because the roving R wound on the bobbin B is thick and soft, the roving R may easily be snapped off when a tension applied to the roving is excessive, and a given wound form of the roving R may easily collapse during winding when a tension applied to the roving is insufficient. For this reason, in the roving machine 1, the tension sensor 37 continuously detects the tension of the roving R between the front roller 11 and the flyer top 12a. The roving machine 1 uses the tension data output by the tension sensor 37 for controlling the operation of the roving winding mechanism 40. As an example of operation of the roving winding mechanism 40 controlled with the tension data, the roving winding mechanism 40 according to the embodiment of the present disclosure controls the winding speed of the roving.
When the tension shown by the tension data is too weak comparing to the reference tension set as a target value, the winding speed of the roving in the roving winding mechanism 40 is controlled to be relatively faster so as to adjust the tension of the roving closer to the reference tension. When the tension shown by the tension data is too strong comparing to the reference tension set as the target value, the winding speed of the roving in the roving winding mechanism 40 is controlled to be relatively slower so as to adjust the tension of the roving closer to the reference tension. In this way, the roving R is wound on a bobbin B by appropriately controlling the tension of the roving R wound on the bobbin B.
The flyer 12 rotates at a rotational speed according to a predetermined speed curve, and the bobbin wheel 17 rotates at a speed faster than the flyer 12. Then, the roving R is wound on the bobbin B by the difference in the rotational speed between the flyer 12 and the bobbin wheel 17. When the rotation speed of the bobbin wheel 17 increases, the winding speed of the roving increases. When the rotation speed of the bobbin wheel 17 decreases, the winding speed of the roving decreases. In addition, when the winding speed of the roving increases, the tension of the roving increases, whereas when the winding speed of the roving decreases, the tension decreases. In other words, the tension of the roving depends on the winding speed of the roving in the roving winding mechanism 40 whereas the winding speed of the roving depends on the rotational speed of the bobbin wheel 17.
In this way, the tension of the roving is controlled by controlling the rotational speed of the bobbin wheel 17. In the roving machine 1, tension control data is generated based on the tension data output by the tension sensor 37, and the rotational speed of the bobbin wheel 17 is controlled based on the tension control data. The tension control data is for controlling the tension of the roving. According to the embodiment of the present disclosure, the rotational speed of the bobbin wheel 17 is used as a parameter to control the tension of the roving, and thus, the tension control data determines the rotational speed of the bobbin wheel 17. The tension control data is determined so that the tension of the roving R detected by the tension sensor 37 gets closer to the reference tension.

FIG. 2 is a schematic diagram illustrating a configuration of a roving system 100 according to a reference embodiment of the present disclosure. The illustrated roving system 100 has a configuration including a plurality of roving machines 1A, 1B, and 1C (three units in an example shown in FIG. 2). The roving machines 1A, 1B, and 1C have roving winding mechanisms 40A, 40B, and 40C, respectively, with the same machine specification for spinning a roving of the same type. The type of the roving is specified by the raw roving material, the yarn count (diameter of a roving), the dyeing, or the like. The machine specification of the roving winding mechanism includes a specification of components constituting the roving winding mechanism and a machine setting specification according to the type of the roving.
The roving machines 1A, 1B, and 1C are equipped with tension sensors 37A, 37B, and 37C, respectively. Each of the tension sensors 37A, 37B, and 37C is provided to a specific spindle among multiple spindles contained in a single unit of the roving machine. In the roving machines 1A, 1B, and 1C, tension data output from the respective tension sensors 37A, 37B, and 37C are input into respective control sections 41 A, 41B, and 41C. The control sections 41A, 41B, and 41C control the operation of the respective roving winding mechanisms 40A, 40B and 40C based on the tension data output from the respective tension sensors 37A, 37B, and 37C.
In the roving system 100 according to the reference embodiment having the above configuration, the roving machines 1A, 1B, and 1C are equipped with the tension sensors 37A, 37B, and 37C, respectively, and thus, any of the roving machines 1A, 1 B, and 1C appropriately controls the tension of the roving so as to spin the roving in fine quality. However, because the roving machines 1A, 1B, and 1C are equipped with the tension sensors 37A, 37B, and 37C, respectively, the price of the individual roving machines 1A, 1B, and 1C constituting the roving system 100 is costly.

FIG. 3 is a schematic diagram illustrating a configuration of a roving system according to an embodiment of the present disclosure. The same reference numerals assigned to the components of the reference embodiment are used in the description about the respective components in the embodiment of the present disclosure for comparison between them.
An illustrated roving system 100 has a configuration including a plurality of roving machines, 1A, 1B, and 1C (i.e. three units in an example shown in FIG. 3). Each of the roving machines, 1A, 1B, and 1C, has a roving winding mechanism using the same machine specification for spinning a roving of the same type. These configurations are the same as those in the reference embodiment.
However, among the three roving machines 1A, 1B, and 1C according to the embodiment of the present disclosure, a tension sensor 37A is provided to the roving machine 1A but not to the roving machines 1B and 1C. In other word, the roving machine 1A is the only machine that has a tension sensor 37A. The system in the roving system 100 according to the embodiment of the present disclosure is configured to use the roving machine 1A as a master machine and the roving machines 1B and 1C as slave machines. The master machine is a roving machine that controls the tension of the roving thereof using a tension sensor provided to its own machine, which corresponds to a first roving machine. The slave machine is a roving machine that controls the tension of the roving thereof using the tension sensor provided to the other machine, which corresponds to a second roving machine. The above other machine refers to a roving machine other than its own. Therefore, from a standpoint of the roving machine serving as the master machine, the master machine itself is its own machine, and the slave machine is the other machine i.e. the other roving machine. On the other hand, from a standpoint of the roving machine serving as the slave machine, the slave machine itself is its own machine, and the master machine is the other machine.
A plurality of the roving machines 1A, 1B, and 1C is connected to a common network 42. The network 42 is configured to have a Local Area Network (LAN), for example. The network 42 may be either wired or wireless.

FIG. 4 is a functional block diagram showing the roving system containing the roving machine configuration of the master machine and the roving machine configurations of the slave machines, according to the embodiment of the present disclosure. FIG. 4 only shows functions required to implement the embodiment of the present disclosure.

(Master machine)

The roving machine 1A serving as the master machine includes the above tension sensor 37A, a roving winding mechanism 40A (corresponding to first roving winding mechanism), a control section 41A (corresponding to first control section), and a transmission section 44A. The transmission section 44A is for sending data through the network 42. In the roving machine 1A, tension data output from the tension sensor 37A is provided to the control section 41A and the transmission section 44A. The control section 41A uses the tension data provided from the tension sensor 37A to control the operation of the roving winding mechanism 40A. The transmission section 44A sends the tension data output from the tension sensor 37A through the network 42 to the other machines (corresponding to roving machines 1B and 1C).

(Slave machine)

On the other hand, the roving machine 1B serving as the slave machine includes a roving winding mechanism 40B (corresponding to second roving winding mechanism), a control section 41B (corresponding to second control section), and a reception section 46B. The machine specification of the roving winding mechanism 40B is the same as the machine specification of the roving winding mechanism 40A of the roving machine 1A. The reception section 46B is for receiving data through the network 42. In the roving machine 1B, the tension data sent from the transmission section 44A of the roving machine 1A is received by the reception section 46B through the network 42. The reception section 46B provides the received tension data to the control section 41B. The control section 41B uses the tension data provided from the reception section 46B to control the operation of the roving winding mechanism 40B. The roving machine 1C serving as the slave machine has the same configuration as the roving machine 1B. In other words, the roving machine 1C includes a roving winding mechanism 40C (corresponding to second roving winding mechanism), a control section 41C (corresponding to second control section), and a reception section 46C. However, the roving machines 1B and 1C have no tension sensors.

FIG. 5 is a flow diagram showing the processing procedure of the roving machine 1A serving as the master machine in the roving system according to the embodiment of the present disclosure. FIG. 5 shows the processing procedure for winding a predetermined amount of the roving R on one of the bobbins B in spindles contained in the roving machine 1A.
The roving machine 1A starts detecting the tension of the roving R (Step S11). The tension of the roving R is detected by the tension sensor 37A. The tension sensor 37A provides the tension data of the roving R to the control section 41A and the transmission section 44A.
Then, the transmission section 44A starts sending the tension data provided from the tension sensor 37A (Step S12). The transmission section 44A sends the tension data through the network 42 to the other machines, namely the roving machines 1B and 1C. The transmission section 44A continues sending the tension data until the roving machine 1A finishes winding the roving on the one of the bobbins B.
The control section 41A starts controlling the operation of the roving winding mechanism 40A by using the tension data provided from the tension sensor 37A (Step S13). The control section 41A generates the tension control data based on the tension data provided from the tension sensor 37A and controls the rotational speed of the bobbin wheel 17 based on the tension control data. In this way, the roving machine 1A serving as the master machine uses the tension data output from the tension sensor 37A provided to its own machine so as to appropriately control the tension of the roving R.
Then, the control section 41A determines whether or not the bobbin B is in a full-bobbin state (Step S14). The full-bobbin state refers to a state in which a predetermined amount of the roving is wound on the bobbin B. When the bobbin B is not in the full-bobbin state, the roving winding mechanism 40A continues winding the roving. When the bobbin B is in the full-bobbin state, the roving winding mechanism 40A cuts the roving to finish winding.

FIG. 6 is a flow diagram showing the processing procedure of the roving machines 1B and 1C serving as the slave machines in the roving system according to the embodiment of the present disclosure. FIG. 6 shows the processing procedure for winding a predetermined amount of the roving R on a bobbin B of each of spindles contained in the roving machines 1B and 1C. Since the roving machines 1B and 1C operate in the same processing procedure, only the processing procedure of the roving machine 1B will be described below.
In the roving machine 1B, the reception section 46B waits for receiving the tension data (Step S21). When the tension data is sent through the network 42, the reception section 46B starts receiving the tension data (Step S22). The reception section 46B continues receiving the tension data while the transmission section 44A of the roving machine 1A sends the tension data through the network 42. The reception section 46B provides the received tension data to the control section 41B.
The control section 41B starts controlling the operation of the roving winding mechanism 40B by using the tension data provided from the reception section 46B (Step S23). The control section 41B generates the tension control data based on the tension data provided from the reception section 46B, and controls the rotational speed of the bobbin wheel 17 based on the tension control data. In this way, the roving machine 1B or the slave machine uses the same tension data as that of the roving machine 1A or the master machine so as to appropriately control the tension of the roving R.
Then, the control section 41 B determines whether or not the bobbin B is in the full-bobbin state (Step S24). When the bobbin B is not in the full-bobbin state, the roving winding mechanism 40B continues winding the roving. When the bobbin B is in the full-bobbin state, the roving winding mechanism 40B cuts the roving to finish winding.
By operating the roving machines 1B and 1C according to the above processing procedure, the tension data output from the tension sensor 37A of the roving machine 1A is shared to the roving machines 1B and 1C. The roving machines 1B and 1C operate simultaneously using the common tension data.

According to the embodiment of the present disclosure, in order to spin the roving of the same type at each of roving machines 1A, 1B, and 1C that constitute the roving system 100, the tension data output from the tension sensor 37A of the roving machine 1A is shared among the roving machines 1A, 1B, and 1C to control the winding operation of the roving. In this way, in addition to the roving machine 1A equipped with the tension sensor 37A, even the roving machines 1B and 1C having no tension sensors are enabled to control the tension of the roving with an accuracy of the same level as that of the roving machine 1A. Therefore, to spin the roving of the same type by using a plurality of the roving machines 1A, 1B, and 1C having the same machine specification, each of the roving machines 1A, 1B, and 1C is enabled to spin the roving in fine quality without providing the tension sensor to each of the roving machines 1A, 1B, and 1C individually. In comparison with the reference embodiment (in FIG. 2), the prices of the roving machines 1B and 1C may be reduced among the roving machines 1A, 1B, and 1C, that constitute the roving system 100.
In the reference embodiment, the tension sensors 37A, 37B, and 37C are provided to the roving machines, 1A, 1B, and 1C, individually and respectively. For this reason, if some of the tension sensors 37A, 37B, and 37C provided to the respective roving machines 1A, 1B, and 1C have some failure, it is unavoidable to adjust the faulty machines individually or to operate the system without using the faulty tension sensors among the tension sensors 37A, 37B, and 37C. In contrast to the reference embodiment above, the tension data obtained by the tension sensor 37A provided to the roving machine 1A is applied to all of the roving machines 1A, 1B, and 1C in the roving system 100 to perform the winding operation of the roving, according to the embodiment of the present disclosure. In this way, the quality of the roving spun at each of the roving machines 1A, 1B, and 1C is maintained only with the single tension sensor 37A.

The technical scope of the present disclosure is not limited to the above embodiment but includes embodiments with modifications and improvements made as far as those embodiments produce some specific effects achieved by the components and combinations of the present disclosure.
In an example according to the above embodiment of the present disclosure described above, the tension data output from the tension sensor 37A provided to the roving machine 1A is sent to the roving machines 1B and 1C through the network 42. However, the present disclosure is not limited to this embodiment. For example, a configuration may be employed in which the tension control data generated by the control section 41A of the roving machine 1A based on the tension data output from the tension sensor 37A of the roving machine 1A is sent to the roving machines 1B and 1C through the network 42. When this configuration is employed, the reception sections 46B and 46C of the respective roving machines 1B and 1C receive the tension control data sent from the transmission section 44A of the roving machine 1A, and then based on the received tension control data, the respective control sections 41 B and 41C of the roving machines 1B and 1C control the respective roving winding mechanisms 40B and 40C.
In an example according to the above embodiment of the present disclosure described above, the roving system 100 includes three units of the roving machines 1A, 1B, and 1C. However, the present disclosure is not limited to this embodiment. The number of units of the roving machines configuring the roving system 100 may be two, four, or more.
In an example according to the above embodiment of the present disclosure described above, the roving machine 1A has a configuration in which the tension data is directly provided to the transmission section 44A from the tension sensor 37A. However, the present disclosure is not limited to this embodiment. For example, a configuration may be employed in which the tension data output from the tension sensor 37A is stored in a memory before being sent to the transmission section 44A.
According to the above embodiment of the present disclosure described above, the roving machine 1B has a configuration in which the tension data received by the reception section 46B is directly provided to the control section 41B. However, the present disclosure is not limited to this embodiment. The roving machine 1B may employ a configuration in which the data received by the reception section 46B is stored in a memory before being sent to the control section 41B. This configuration may also apply to the roving machine 1C.
A roving system (100) contains a first roving machine (1A) and a second roving machine (1B, 1C). The first roving machine (1A) includes a first roving winding mechanism (40A), a tension sensor (37A), and a first control section (41A) that controls the operation of the first roving winding mechanism (40A) based on tension control data. The second roving machine (1B, 1C) includes a second roving winding mechanism (40B, 40C) having the same machine specification as the first roving winding mechanism (40A) to spin the same type of the roving (R), and a second control section (41B, 41C), but not the tension sensor (37A). A plurality of roving machines (1A, 1B, 1C) is connected through a network (42). The first roving machine (1A) further includes a transmission section (44A) whereas the second roving machine (1B, 1C) further includes a reception section (46B, 46C). The tension control data is sent from the transmission section (44A) to the reception section (46B, 46C) so that the second control section (41B, 41C) controls the operation of the second roving winding mechanism (40B, 40C) based on the tension control data.

Claims

A roving system (100) comprising:
a first roving machine (1A) comprising:
a first roving winding mechanism (40A) twisting a roving (R) to wind the roving on a bobbin (B);

a tension sensor (37A) detecting tension of the roving (R) wound on the bobbin (B); and

a first control section (41A) generating tension control data based on tension data output from the tension sensor (37A) and controlling operation of the first roving winding mechanism (40A) based on the tension control data; and

a second roving machine (1B, 1C) comprising:
a second roving winding mechanism (40B, 40C) spinning a same type of the roving (R) spun by the first roving machine (1A) and having a same machine specification as the first roving winding mechanism (40A); and

a second control section (41B, 41C) controlling operation of the second roving winding mechanism (40B, 40C), characterized in that

the second roving machine (1B, 1C) has no tension sensor (37A),

a plurality of the roving machines (1A, 1B, 1C) including the first roving machine (1A) and the second roving machine (1B, 1C) is connected to one another through a network (42),

the first roving machine (1A) further comprises a transmission section (44A) sending the tension data or the tension control data through the network (42), and

the second roving machine (1B, 1C) further comprises a reception section (46B, 46C) receiving the tension data or the tension control data sent from the first roving machine (1A) through the network (42), the second control section (41B, 41C) controlling the operation of the second roving winding mechanism (40B, 40C) using the tension control data generated by the second control section (41B, 41C) based on the tension data received by the reception section (46B, 46C), or using the tension control data received by the reception section (46B, 46C).
A roving machine (1A) characterized by comprising:
a roving winding mechanism (40A) twisting a roving (R) to wind the roving on a bobbin (B);

a tension sensor (37A) detecting tension of the roving (R);

a control section (41A) controlling operation of the roving winding mechanism (40A) using tension control data generated by the control section (41A) based on tension data output from the tension sensor (37A); and

a transmission section (44A) sending the tension data or the tension control data to other machine through a network (42).
A roving machine (1B, 1C) characterized by comprising:
a roving winding mechanism (40B, 40C) twisting a roving (R) to wind the roving on a bobbin (B);

a control section (41B, 41C) controlling operation of the roving winding mechanism (40B, 40C); and

a reception section (46B, 46C) receiving data through a network (42), wherein

the reception section (46B, 46C) receives tension data output from the tension sensor (37A) provided to other machine for detecting tension of the roving (R) or tension control data generated in the other machine based on the tension data, through the network (42), and

the control section (41B, 41C) controls operation of the roving winding mechanism (40B, 40C) using the tension control data generated by the control section (41B, 41C) based on the tension data received by the reception section (46B, 46C), or using the tension control data received by the reception section (46B, 46C).