JPWO2006030661A1 - Core yarn spinning machine, core yarn core yarn presence / absence determination method, and service method in core yarn spinning machine - Google Patents

Abstract

In a core yarn spinning machine (1) comprising a spinning device (9) for spinning the core yarn and a winding device (12) for winding the spun core yarn (10), the presence or absence of the core yarn of the core yarn (10) is determined. A slab catcher (35) is provided. In the spinning device (9), the core yarn (10) spun at the time before the winding of the core yarn (10) by the winding device (12) before the winding of the core yarn (10) is started. 10) is introduced into the slab catcher (35). At the time of introduction, the presence of the core yarn is made to be more obvious than the time after the winding of the core yarn (10) by the winding device (12) is started.

Description

The present invention relates to a core yarn spinning machine capable of determining the presence or absence of a core yarn. The present invention also relates to a core yarn presence / absence determination method for determining whether a core yarn is contained in a core yarn.
Furthermore, the invention relates to a method for performing some service in a core yarn spinning machine.

The core yarn spinning machine disclosed in Patent Document 1 is an air spinning device for an elastic yarn as a core yarn supplied from an elastic yarn supply device and a fiber bundle (covering fiber) drafted by a draft device. It is configured to produce a core yarn having a structure in which a core yarn is wrapped with covering fibers by air spinning. The core yarn spinning machine is provided with a winding device for winding the core yarn as a package, and a slab catcher (yarn monitoring means) for detecting yarn defects such as yarn unevenness in the core yarn fed to the winding device. . Further, the elastic yarn supply device is provided with an elastic yarn detection sensor for detecting the elastic yarn, and when the sensor detects that there is no elastic yarn, the spinning operation is automatically stopped.
Japan, Japanese Patent Laid-Open No. 2002-363834 (FIG. 4, paragraph number 0058 for elastic yarn detection sensor (reference numeral 32))

  In Patent Document 1, since the elastic yarn detection sensor is provided on the upstream side of the pneumatic spinning device, the elastic yarn is detected on the downstream side of the pneumatic spinning device even though the elastic yarn sensor detects the elastic yarn. The case where it does not enter the inside of the covering fiber is considered. For example, when spinning of the core yarn is started, the elastic yarn may be sucked into the suction nozzle so as to pass through the side of the pneumatic spinning device, and the yarn of only the covering fiber may be spun from the pneumatic spinning device. If such a coreless yarn is wound on a package, it causes a significant deterioration of the package quality.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a detection method capable of reliably detecting whether or not a core yarn is contained in a core yarn, and a core yarn spinning machine capable of such detection. It is to provide.
Another object of the present invention is to provide means capable of performing such detection while minimizing the operation stop time of the textile machine.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  According to a first aspect of the present invention, there is provided a core yarn spinning machine configured as follows. That is, a spinning device that spins the core yarn and a winding device that winds the spun core yarn are provided. A core yarn presence / absence determining means for determining the presence / absence of the core yarn of the core yarn, at a time before winding from the start of spinning of the core yarn in the spinning device to the start of winding of the core yarn by the winding device; Then, the spun core yarn is introduced into the core yarn presence / absence determining means.

Thereby, the presence or absence of the core yarn can be determined before the core yarn is wound, and the yarn without the core yarn can be prevented from being wound on the package. Therefore, a good quality winding package can be formed.
In addition, this time before winding is specifically at the time of piecing where the starting end of the core yarn on the side where spinning was started in the spinning device after yarn breakage and the end of the core yarn wound on the winding device are joined together. At the time of doffing when the full package wound by the winding device is replaced with an empty winding tube on which the yarn is not wound and the yarn is attached to the winding tube. This is the time before thread installation. When doffing, it includes the case where the yarn is not yet wound by the winding device and only the operation of attaching the yarn to the empty winding tube attached to the winding device is performed.

In the core yarn spinning machine, when the core yarn is introduced into the core yarn presence / absence determining means, the core yarn is present more than the time after the spinning of the core yarn by the winding device is started. It is preferable to reveal
That is, when the core yarn is introduced into the core yarn presence / absence determining means, if the presence of the core yarn becomes more obvious than the time after the start of winding by the winding device, the determination by the core yarn presence / absence determining means is more reliably performed. It can be carried out. Further, since the presence of the core yarn is revealed using the core yarn before winding by the winding device, the core yarn subjected to the core yarn revealing process is wound by the winding device to reduce the quality. There is nothing.
Here, the manifestation of the presence of the core yarn is a process that makes the presence of the core yarn noticeable if the core yarn is present. For example, the core yarn has a predetermined value compared to the case where the core yarn is not present. A process that causes a change (for example, a process that loosens an elastic core yarn core yarn described later) or a process that increases the ratio of the thickness of the core yarn to the total thickness of the core yarn. Say.

In the core yarn spinning machine, the core yarn of the core yarn is an elastic yarn, and the core yarn presence / absence determining means determines that the core yarn is present when the thickness of the core yarn or a variation thereof is larger than a threshold value. The manifestation of the presence of the core yarn is preferably performed by reducing the tension of the core yarn or loosening the core yarn from the time after the start of winding.
That is, when the core yarn of the core yarn is an elastic yarn rich in stretchability, the normal core yarn having the core yarn contracts depending on the tensile force in the length direction and expands in the radial direction. For this reason, if the tension is weakened or slackened from the time after the start of winding the core yarn, in the case of a normal core yarn having a core yarn, the thickness of the core yarn detected by the core yarn presence / absence determining means or its variation is detected. There is a tendency to grow. On the other hand, in the case of an abnormal core yarn without a core yarn, the above tendency is not observed. Accordingly, the tension of the core yarn is made weaker or slacker than the time after the start of winding, and based on whether the thickness of the core yarn detected by the core yarn presence / absence determining means or the variation thereof is larger than a predetermined value. When the presence or absence is determined, it can be accurately detected whether or not the core yarn is contained in the core yarn.

In the core yarn spinning machine, the core yarn presence / absence determining means is also a yarn monitoring means at a time after the start of winding, and the core yarn presence / absence determining means sets a threshold value for determining the presence / absence of core yarn after the start of winding. It is preferable to have it separately from the threshold for yarn monitoring at this time.
Accordingly, the core yarn presence / absence determining means and the yarn monitoring means can be made common, and both the presence / absence of the core yarn and the yarn monitoring can be accurately performed using different threshold values according to the purpose.

  According to the second aspect of the present invention, in the core yarn presence / absence determination method for determining the presence / absence of a core yarn in the core yarn, the core yarn in which the presence of the core yarn is made more obvious than in a normal state is used. There is provided a core yarn core yarn presence / absence determination method that determines that the core yarn is present when the thickness of the core yarn detected by the detection unit or the variation thereof is larger than a predetermined value.

  In other words, when the core yarn is made more obvious than the normal state, the detection unit detects the normal core yarn having the core yarn compared to the abnormal core yarn without the core yarn. The thickness of the core yarn or its variation increases. Accordingly, when the presence or absence of the core yarn is determined based on whether the thickness of the core yarn detected by the detection unit or the variation thereof is greater than a predetermined value, it is possible to accurately detect whether or not the core yarn is contained in the core yarn. Can do.

  In the core yarn core yarn presence / absence determination method, when the core yarn of the core yarn is an elastic yarn, the presence of the core yarn is manifested by weakening the tension of the core yarn or lowering the core yarn. It is preferably done by loosening.

  That is, when the core yarn of the core yarn is an elastic yarn rich in stretchability, the normal core yarn having the core yarn contracts depending on the tensile force in the length direction and expands in the radial direction. For this reason, when the tension of the core yarn is weakened or slackened from the normal state, in the case of a normal core yarn having a core yarn, the thickness of the core yarn detected by the detection unit or its variation tends to increase. On the other hand, in the case of an abnormal core yarn without a core yarn, the above tendency is not observed. Therefore, when the presence or absence of the core yarn is determined based on whether the core yarn thickness detected by the detection unit or the variation thereof is greater than a predetermined value, the core yarn is weakened or slackened from the normal state. It is possible to accurately detect whether or not the core yarn is contained in.

  According to a third aspect of the present invention, there is provided a service method in a core yarn spinning machine, wherein the core yarn is guided to a core yarn presence / absence judging means for judging the presence / absence of a core yarn of the core yarn at the time of the service. A service method is provided.

  Thereby, during any service work in the core yarn spinning machine, for example, during the yarn splicing work accompanied by the spinning start work, during the doffing work, etc., the spinning machine determines the presence or absence of the core yarn by the core yarn presence / absence judging means. Without increasing the winding stop time, it is possible to reliably detect the absence of the core yarn of the core yarn and prevent deterioration of the package quality.

In the above service method, it is preferable that the guide to the core yarn presence / absence determining means of the core yarn is performed at a timing before the service for the yarn winding is finished.
Thereby, it becomes easy to end the core yarn presence / absence determination during the service time, and the increase in the winding stop time of the spinning machine can be suppressed.

In the service method, it is preferable that the determination of the presence / absence of the core yarn by the core yarn presence / absence determination means is performed at a timing before the service ends.
Thereby, the increase in the winding stop time of the spinning machine can be made zero. In addition, since the presence / absence determination of the core yarn is performed at the timing before the service is finished and the winding is resumed, even if the determination of the absence of the core yarn is made by the means for determining the presence / absence of the core yarn, it is easy to recover from the abnormality. is there.

  According to the 4th viewpoint of this invention, the core yarn spinning machine comprised as follows is provided. That is, it has a unit for spinning and winding the core yarn, and a service device for providing a service to the unit. Core yarn presence / absence determining means for determining the presence / absence of core yarn of the core yarn, and guide means for capturing the core yarn at the time of servicing the unit and guiding the captured core yarn to the core yarn presence / absence determining means are provided.

  Thus, the core yarn can be easily guided to the core yarn presence / absence determining means by capturing the core yarn at the time of service. Therefore, the presence / absence of the core yarn can be reliably determined during service work.

In the core yarn spinning machine, the core yarn presence / absence determining means is provided in the unit, the service device is arranged facing the unit, and the guiding means guides the core yarn to the core yarn presence / absence determining means. It is preferable that a movable guide is provided on the service device side.
Accordingly, the core yarn can be easily guided from the service device to the core yarn presence / absence determining means by moving the guide.

In the core yarn spinning machine, the guide is preferably retracted to the service device side when the service is not performed.
As a result, the guide is retracted to the service device side at times other than during service, so that interference between the traveling core yarn or unit side parts and the guide is avoided, and smooth winding becomes possible.

In the core yarn spinning machine, it is preferable that the guide swirls from the retracted state and extends toward the yarn path side of the core yarn to catch the core yarn and guide it to the core yarn presence / absence determining means.
Thereby, the core yarn can be accurately guided to the core yarn presence / absence determining means. Further, in the retracted state before turning and extending, the guide can be made compact, and the service device can be miniaturized.

In the core yarn spinning machine, it is preferable that the core yarn presence / absence determining means also serves as a yarn defect detecting means installed on the unit side.
This eliminates the need for specially providing a core yarn presence / absence determining means, and further simplifies the configuration.

In the core yarn spinning machine, it is preferable that a plurality of units are arranged in parallel, and the service device is configured to be able to travel between the plurality of units.
As a result, a plurality of units can be handled by a single service device, so that the configuration is further simplified and the manufacturing cost can be reduced.

1 is a front view of a core yarn spinning machine according to an embodiment of the present invention. The side view showing the core yarn spinning machine as a longitudinal section. The block diagram of the slab catcher which functions as a core yarn presence determination means of the core yarn spinning machine. The graph which shows the difference in the output voltage of the light-receiving part of a slab catcher by the presence or absence of the core yarn inside a core yarn. The front view of the core yarn spinning machine which concerns on 2nd embodiment of this invention. The side view showing the core yarn spinning machine as a longitudinal section. The block diagram of the slab catcher which functions as a core yarn presence determination means of the core yarn spinning machine. The side view which shows a mode that the doffing operation | movement of the doffing cart is started, the full package is removed, and the core yarn is sucked and supplemented with a suction pipe in the same core yarn spinning machine. The side view which shows a mode that while pulling out a core yarn from the state of FIG. 8 and guiding the core yarn to a slab catcher with a guide. FIG. 10 is a block diagram of a slab catcher that functions as a core yarn presence / absence determination unit, corresponding to FIG. 9. The perspective view seen from the doffing cart side which shows the mode of the guide immediately after the doffing operation | movement in the doffing cart was started. The perspective view which shows a mode that a guide is turned from a retracted state, is projected to the spinning unit side, and a yarn path is brought close by a yarn guide plate. The perspective view which shows a mode that a pneumatic cylinder is extended further and guides a core yarn to a slab catcher. The perspective view which shows a mode that a thread path is removed from a thread gathering board. The perspective view which shows a mode that the yarn path guidance by a guide was completed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Core yarn spinning machine 2 Spinning unit 9 Spinning device 11 Yarn feeding device 12 Winding device 22 Elastic yarn (core yarn)
35 Slab catcher (yarn defect detector, core yarn presence / absence judging device, core yarn presence / absence judging means)
43 Yarn splicing device 44 Suction pipe (capture introduction means, core yarn revealing means)
101 core yarn spinning machine 102 units (spinning unit)
104 doffing equipment (service equipment, service cart)
110 Core yarn 122 Elastic thread (core thread)
135 Slab catcher (core yarn presence / absence determination means, core yarn presence / absence determination device, yarn defect detection means)
158 Guide 188 Suction pipe (core yarn catching means, core yarn revealing means)

  Hereinafter, a preferred first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows a core yarn spinning machine 1 having a large number of spinning units 2 arranged side by side. The spinning machine 1 is equipped with a yarn splicing carriage (service device) 3, a blower box 4, and a prime mover box 5 provided so as to be able to run in the direction in which the spinning units 2 are arranged.

  As shown in FIG. 1, each spinning unit 2 has a draft device 7, a spinning device 9, a yarn feeding device 11, and a winding device 12 as main components. The draft device 7 is provided in the vicinity of the upper end of the casing 6 of the spinning machine 1, and the fiber bundle 8 sent from the draft device 7 is spun by the spinning device 9. A spun yarn (core yarn) 10 discharged from the spinning device 9 is sent downward, and a slab catcher (yarn defect detector, yarn monitoring means) for detecting a yarn defect, cutting the yarn and removing the yarn defect portion. After passing through 35, the take-up device 12 takes up a bobbin as a take-up tube to form a package 45. For example, the slab catcher 35 can be considered to have a function of detecting a defect in yarn thickness unevenness, a function of detecting foreign matter mixed in the spun yarn 10, or a combination of these functions.

  As shown in FIG. 2, the draft device 7 is for drawing the sliver 13 into a fiber bundle 8, and includes a middle roller 17 and a front roller 18 on which a back roller 14, a third roller 15, and an apron belt 16 are mounted. These four rollers are used.

  The yarn feeding device 11 includes a delivery roller 19 supported by the casing 6 of the spinning machine 1 and a nip roller 20 provided so as to be in contact with the delivery roller 19. With this configuration, the core yarn 10 discharged from the spinning device 9 is sandwiched between the delivery roller 19 and the nip roller 20, and the delivery roller 19 is rotationally driven, whereby the core yarn 10 is sent to the winding device 12 side.

  An elastic yarn supply device 23 is provided above the draft device 7. The elastic yarn 22 supplied from the elastic yarn supply device 23 joins the fiber bundle 8 from between the front roller 18 and the middle roller 17, passes through the front roller 18 together with the fiber bundle 8, and is introduced into the spinning device 9. It is configured to be.

  In the elastic yarn supplying device 23, a rotating roller 26 that rotates in contact with the peripheral surface of the elastic yarn package 25 and a motor 24 that rotates the rotating roller 26 via a belt 28 are provided for each spinning unit 2. It is attached. The elastic yarn package 25 is rotatably supported by a cradle arm 27 pivotally supported.

  With the above configuration, the elastic yarn 22 unwound from the elastic yarn package 25 passes through the air soccer device 30, a clamp cutter device (not shown), and the supply guide cylinder 31, and is supplied to a position slightly upstream of the front roller 18. The fiber bundle 8 is introduced into the spinning device 9. Then, the fiber bundle 8 is wound around the outer periphery of the elastic yarn 22 by the swirling air flow generated by the spinning device 9, and the core yarn 10 having the elastic yarn rich in elasticity as the core yarn is spun. Further, it is sent downstream. Note that the peripheral speed of the delivery roller 19 of the yarn feeder 11 is configured to be greater than the peripheral speed of the rotating roller 26, whereby the elastic yarn 22 is stretched to a predetermined stretch ratio (for example, 3 times). Thus, the fiber bundle 8 is wound and spun by the spinning device 9.

  As shown in FIG. 1, the yarn joining cart 3 is provided so as to travel along a rail 41 provided in the casing 6 of the spinning machine 1 main body. The yarn joining cart 3 includes a yarn joining device 43 made of, for example, a splicer, and a yarn end of the core yarn 10 that is provided on the yarn joining cart 3 so as to be freely raised and lowered and that is discharged from the spinning device 9 while turning around an axis. A suction pipe 44 that captures the yarn while sucking it and guides it to the yarn joining device 43, and a package 45 that is provided on the yarn joining cart 3 so as to be able to be raised and lowered, and is rotatably supported by the winding device 12 while turning around the shaft. A suction mouth 46 that sucks and captures the yarn end and guides it to the yarn splicing device 43.

  A slab catcher 35 and a cutter device 36 are provided on the front side of the casing 6 of the spinning machine 1, and the core yarn 10 spun by the spinning device 9 passes through a detection portion of the slab catcher 35. . The slab catcher 35 monitors the thickness of the traveling core yarn 10 and transmits a yarn defect detection signal when a fine yarn portion or a thick yarn portion (yarn defect) of the core yarn 10 is detected. Upon receiving this signal, the controller of the spinning unit 2 immediately operates the cutter device 36 to cut the core yarn 10, and temporarily stops the draft device 7, the spinning device 9, the elastic yarn supplying device 23, etc. 3 to self-propelled to the front of the spinning unit 2. Thereafter, the spinning device 9 and the elastic yarn supply device 23 are re-driven, and the yarn joining cart 3 is spliced to resume spinning and winding.

  As shown in FIG. 3, the slab catcher (yarn clearer) 35 includes a light projecting unit 37 including a light emitting element such as an LED and a light receiving unit 38 including a photoelectric conversion element. The size (area) of a shadow formed on the light receiving unit 38 as a result of the light projected from the light projecting unit 37 being blocked by the core yarn 10 can be converted into a voltage signal by the light receiving unit 38. ing. As the light receiving unit 38 of the present embodiment, a photoelectric conversion element having a characteristic in which the voltage value increases almost in proportion to the size of the shadow is used.

  The slab catcher controller 51 is a known microcomputer, and includes a CPU (arithmetic means), a ROM, a RAM (storage means), and an interface (not shown). An appropriate program is provided in the storage means, and the control unit 56, the storage unit 52, the comparison unit 53, the light projection control unit 55, etc. are built in the slab catcher controller 51 by the hardware and the software. Has been.

  The storage unit 52 is mainly composed of a RAM, and stores a voltage value range (allowable voltage value) corresponding to the allowable range of the thickness of the normal core yarn 10, that is, a threshold value for yarn monitoring. A threshold value for determining the presence / absence of a core yarn, which will be described later, can also be stored. The control unit 56 controls the overall operation and performs communication with the controller on the spinning unit 2 side. A comparison unit 53 is configured inside the control unit 56, and the comparison unit 53 compares the voltage value input from the light receiving unit 38 with the allowable voltage value.

  With this configuration, voltage signals from the light receiving unit 38 are successively input to the slab catcher controller 51 to monitor changes in the thickness of the traveling core yarn 10. That is, when the thickness (contour thickness) of the traveling core yarn 10 varies, the size of the shadow formed on the light receiving unit 38 varies, which appears as a variation in the voltage value output from the light receiving unit 38. This voltage value is digitally converted by the A / D converter 54 and then input to the comparison unit 53 where it is compared with the allowable voltage value. When the core yarn 10 has a yarn defect such as a thick yarn portion or a fine yarn portion, and the yarn defect passes through the detection unit 39, the output voltage value of the light receiving unit changes and falls outside the allowable voltage value range. The control unit 56 of the slab catcher controller 51 that has detected this by the comparison unit 53 sends a yarn defect signal to the control unit 57 of the controller of the spinning unit 2. When this is received, the spinning unit 2 side immediately sends a signal to the cutter device 36 to cut the core yarn 10, and a request for the yarn joining operation by the yarn joining device 43 is generated. At the same time, the spinning device 9, the elastic yarn supply device 23, the draft device 7 and the like are stopped, and the winding is interrupted. Thereafter, the control unit 57 of the spinning unit 2 sends a signal to the control unit 60 of the yarn splicing cart 3 so that the spinning unit 2 moves to the position of the spinning unit 2. When the yarn joining cart 3 arrives at the position of the spinning unit 2, the spinning device 9, the elastic yarn supplying device 23 and the like are resumed, and the yarn joining cart 3 performs a predetermined yarn joining operation, so that the core yarn on the spinning side 10 and the end of the core yarn 10 on the package 45 side are joined together for piecing.

  The driving voltage of the light projecting unit 37 can be changed by a variable voltage source 48, and the light projecting control unit 55 of the slab catcher controller 51 is connected to the variable voltage source 48. With this configuration, even if deterioration or temperature drift of the light projecting unit 37 occurs, the voltage value that the variable voltage source 48 gives to the light projecting unit 37 is changed so that the light projecting control unit 55 compensates for it. ing. As a result, stable yarn defect detection is realized.

  The above operation is a normal operation of the slab catcher 35 when the core yarn 10 is taken up by the winding device 12. In this embodiment, the slab catcher 35 is operated at the time of yarn joining (in other words, the core yarn in the spinning device 9). As a determination device for determining whether or not the elastic yarn 22 is contained in the core yarn 10 at a time before winding of the core yarn 10 is started by the winding device 12 after starting spinning of the core 10. Also works. Hereinafter, this configuration will be described.

  That is, when the yarn breakage occurs in the core yarn 10 or when the yarn defect of the core yarn 10 is detected by the slab catcher 35 and the core yarn 10 is cut by the cutter device 36, the yarn joining cart 3 has started the spinning device 9 that has started spinning. The core yarn 10 on the side and the core yarn on the winding device 12 side are spliced by the yarn splicing device 43. At this stage, the winding of the core yarn 10 by the winding device 12 is stopped.

  At this time, the core yarn 10 spun in the spinning device 9 and sucked and captured by the suction pipe 44 is guided so that its yarn path passes through the detection unit 39 and the cutter device 36 of the slab catcher 35 as shown in FIG. . As a result, the core yarn 10 continuously spun from the spinning device 9 is fed by the yarn feeding device 11, passes through the cutter device 36 and the light projecting unit 37, and is then sucked into the suction pipe 44.

  The suction of the core yarn 10 by the suction pipe 44 is performed by the suction flow generation source 62. The suction force of the suction flow generation source 62 is slightly weaker than the yarn feeding force of the yarn feeding device 11. The suction force setting unit 61 of the controller of the yarn splicing cart 3 is set. For this reason, the tension of the core yarn 10 between the yarn feeding device 11 and the suction pipe 44 is smaller than the tension of the core yarn 10 in the upstream portion of the yarn feeding device 11.

  Here, since the core yarn 10 of the present embodiment is spun by winding the fiber bundle 8 around the elastic yarn 22 as a core yarn in a stretched state, the tension is weakened or no tension is applied at all. When not applied, the core yarn 10 contracts in the length direction and slightly expands in the radial direction. Further, the core yarn 10 contracts due to the elastic force of the elastic yarn 22 and exhibits a sharpening. In particular, in the present embodiment, the suction force of the suction pipe 44 is set to be weak as described above. Therefore, the core yarn 10 between the yarn feeding device 11 and the suction pipe 44 has completed the yarn joining by the yarn joining device 43. As compared with the case where the winding of the core yarn 10 by the winding device 12 is resumed, the radial expansion tendency and the twisting tendency appear more strongly, and the presence of the elastic yarn 22 which is the core yarn of the core yarn 10 is manifested. It will be.

  Accordingly, when the normal core yarn 10 having the elastic yarn 22 is spun by the spinning device 9, when the spun core yarn 10 passes through the slab catcher 35 between the yarn feeding device 11 and the suction pipe 44, the light receiving unit 38. As a result, the area of the shadow formed becomes larger and the output voltage of the light receiving section 38 increases. Therefore, instead of detecting the actual thickness of the core yarn 10, the radial expansion can be detected by detecting the interval between the shadow outlines as viewed from the radial direction as the outline thickness. Further, due to the above-described margin, fluctuation (variation) in the output voltage of the light receiving unit 38 increases. On the other hand, when a defective core yarn that does not contain the elastic yarn 22 is spun from the spinning device 9 for some reason, the radial expansion tendency as described above does not appear, so the area of the shadow hardly changes, and the light receiving unit 38. The output voltage of is almost not increased. In addition, since almost no blur occurs, the fluctuation of the output voltage of the light receiving unit 38 is small.

  Using this, the slab catcher controller 51 stores the voltage of the predetermined threshold value for determining the presence or absence of the core yarn in the storage unit 52 as described above, and the voltage value input from the light receiving unit 38 exceeds the threshold value. Whether or not the comparison unit 53 determines. As a result, if the voltage value is equal to or higher than the threshold value, it is determined that the core yarn 10 is normal with the elastic yarn 22, and if the voltage value is lower than the threshold value, it is determined that the core yarn is defective with no elastic yarn 22.

  When it is determined that the core yarn does not contain the elastic yarn 22, the control unit 56 of the slab catcher controller 51 sends a no core yarn detection signal to the control unit 57 on the spinning unit 2 side. On the spinning unit 2 side receiving this, the defective core yarn is immediately cut by the cutter device 36, and the return operation similar to that at the time of the yarn breakage is performed again. Alternatively, the abnormality may be notified and stopped, and the operator may remove the abnormality manually.

  In order to confirm the effect of this configuration, the inventor of the present application uses a normal core yarn containing the elastic yarn 22 and a core yarn containing only the covering fiber not containing the elastic yarn 22 (abnormal core yarn) at the time of winding (winding). The state after starting the winding of the yarn by the take-up device 12) and at the time of yarn joining (before starting the winding of the yarn by the winding device 12, before sucking the yarn end with the suction pipe 44 and tensioning the yarn weakly) In each state, an experiment was conducted in which the detector 39 of the slab catcher 35 was allowed to travel and the tendency of the output voltage value of the light receiver 38 was examined.

  FIG. 4 (A) shows the results for a core yarn having a thickness of Ne30, which was spun in a state where an elastic yarn having a thickness of 40 denier was stretched 3.1 times. The average voltage value at the time of winding was about 3.1V, while it was about 4.1V at the time of piecing.

  On the other hand, FIG. 4 (B) shows the results for a yarn having a thickness of Ne30 that is spun only with the covering fiber (without the elastic yarn) assuming an abnormal core yarn. In this case, the voltage value at the time of winding the yarn and the voltage value at the time of piecing remained almost unchanged, and the average value was about 3.1V.

  4A and 4B, it is clear that when the yarn is spliced, there is a difference of about 1V in the output voltage value between the normal core yarn with elastic yarn and the abnormal core yarn without elastic yarn. Has occurred. Therefore, if the threshold value is set to 3.6 V, for example, and stored in the storage unit 52 and used for the determination in the comparison unit 53, it can be accurately determined whether or not the elastic yarn 22 is contained in the core yarn 10. Become.

  In the present embodiment, as described above, the slab catcher 35 for determining the presence or absence of the core yarn (elastic yarn) 22 of the core yarn 10 is provided, and the spinning device 12 starts spinning the core yarn 10 after the spinning device 9 starts spinning. The core yarn 10 that has been spun is introduced into the slab catcher 35 at the time before winding of the core yarn 10 until the winding of the core yarn 10 is started, that is, at the time of yarn joining service by the yarn joining device 43, and the presence or absence of the elastic yarn 22 It is comprised so that it may determine. Therefore, the presence or absence of the core yarn of the core yarn 10 can be reliably determined with a simple configuration. The determination of the presence / absence of the core yarn is performed after the spinning device 9 starts spinning the core yarn 10 and before the winding by the winding device 12, so that the core yarn used for the determination of the presence / absence of the core yarn is used. 10 is not wound on the winding device 12.

  Further, in the present embodiment, after the spinning is started, the core yarn 10 is sucked weakly by the suction pipe 44, and the presence of the core yarn (elastic yarn) 22 is made clearer than after the winding by the winding device 12 is started. In this state, the slab catcher 35 is introduced. Therefore, the presence or absence of the elastic yarn 22 in the core yarn 10 can be accurately determined.

Moreover, in this embodiment, the core yarn of the core yarn 10 is the elastic yarn 22, and the slab catcher 35 has the core yarn (elastic yarn) 22 because the thickness of the core yarn 10 is larger than a predetermined threshold. I am trying to judge. The manifestation of the presence of the core yarn (elastic yarn) 22 is performed by reducing the tension of the core yarn 10 or loosening the core yarn 10 from the time after the start of winding.
That is, in this embodiment, since the core yarn is the elastic yarn 22 rich in stretchability, the normal core yarn 10 having this core yarn contracts and expands in the radial direction depending on the tensile force in the length direction. To do. For this reason, when the core yarn 10 is weakened or loosened after the winding start by the winding device 12 (during winding), the normal core yarn 10 having the core yarn is detected by the slab catcher 35. The thickness of the core yarn 10 tends to increase. On the other hand, in the case of an abnormal core yarn without a core yarn, the above tendency does not appear. Therefore, the presence or absence of the core yarn (elastic yarn 22) by the slab catcher 35 can be accurately determined.

  In the present embodiment, the presence or absence of the core yarn is determined before the winding device 12 starts winding. The yarn monitoring means for monitoring the defects of the core yarn 10 after the winding device 12 starts winding. As a slab catcher 35. The slab catcher 35 as the core yarn presence / absence determining means has a threshold for determining the presence / absence of the core yarn separately from the threshold for monitoring the yarn during spinning. Accordingly, the core yarn presence / absence determining means and the yarn monitoring means can be made common, and at the same time, the slab catcher 35 can accurately perform both the presence / absence of the core yarn and the yarn monitoring using different thresholds according to the purpose. it can.

  In the present embodiment, the core yarn 10 is guided to the detection unit 39 of the slab catcher 35 that detects the contour of the core yarn 10, and the thickness of the core yarn 10 detected by the detection unit 39 is larger than a predetermined threshold value. It is determined that the elastic yarn 22 is present inside the core yarn 10. Therefore, the presence or absence of the core yarn of the core yarn 10 can be reliably determined with a simple configuration.

  Although the preferred first embodiment of the present invention has been described above, the above configuration can be implemented with various modifications as shown below, for example.

  (1) In the above embodiment, when the presence or absence of the core yarn is determined, the presence or absence of the core yarn is determined based on whether or not the output voltage of the light receiving unit 38 corresponding to the size of the contour (contour thickness) exceeds a predetermined threshold. However, the slab catcher controller 51 has a function of calculating, for example, a variation (variation) in the output voltage of the light receiving unit 38, for example, a standard deviation, and the presence / absence of the core yarn is determined depending on whether the variation exceeds a predetermined threshold. Also good. Further, the presence / absence of the core yarn may be determined in combination from both the thickness of the core yarn detected by the light receiving unit 38 and its variation (variation).

  (2) The slab catcher as the yarn defect detector or the core yarn presence / absence determination device is not limited to a so-called photoelectric type, and for example, a capacitance type slab catcher can be adopted.

  (3) In the above embodiment, the core yarn presence / absence determination device is also used as a slab catcher. However, a core yarn presence / absence determination device may be provided separately from the slab catcher. However, it is desirable that the slab catcher also serves as a core yarn presence / absence determination device because the configuration is further simplified.

  Next, a preferred second embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 5 shows a spinning machine 101 for core yarn spinning provided with a large number of spinning units 102 arranged side by side. In this spinning machine 101, a yarn joining cart 103 provided so as to be able to run in the direction in which the spinning units 102 are arranged, and a doffing cart (service cart, service device) provided so as to be able to run independently of this yarn joining cart. ) 104, a blower box 180, and a prime mover box 181.

  As shown in FIG. 5, each spinning unit 102 has a draft device 107, a spinning member 109, a yarn feeding device 111, and a winding device 112 as main components. The draft device 107 is provided in the vicinity of the upper end of the casing 106 of the spinning machine 101 body, and is sent from a fiber bundle (covering fiber) 108 sent from the draft device 107 and an elastic yarn supply device 123 described later. The elastic yarn (core yarn) 122 is configured to be spun by the spinning member 109. The core yarn 110 as the spun yarn discharged from the spinning member 109 is fed downward by the yarn feeding device 111, passes through the cutter device 136 and the slab catcher (yarn defect detecting means) 135, and is then wound up by the winding device 112. The package 145 is formed.

  As shown in FIG. 6, the draft device 107 is for drawing a sliver 113 into a fiber bundle 108, and includes a middle roller 117 and a front roller 118 on which a back roller 114, a third roller 115, and an apron belt 116 are mounted. These four rollers are used.

  The yarn feeding device 111 includes a delivery roller 139 supported by the casing 106 of the spinning machine 101 main body, and a nip roller 140 provided so as to be able to contact and separate from the delivery roller 139. The core yarn 110 discharged from the spinning member 109 is sandwiched between the delivery roller 139 and the nip roller 140, and the delivery roller 139 is rotationally driven to feed the core yarn 110 to the winding device 112 side.

  As shown in FIGS. 5 and 6, the elastic yarn supply device 123 includes a rotating roller 126 for driving the elastic yarn package 125 for each spinning unit 102. The elastic yarn package 125 is rotatably supported by a cradle arm 127 that is pivotally supported, and is configured to come into contact with the peripheral surface of the rotating roller 126. The rotating roller 126 is connected to the motor 124 via the belt 128 for each spinning unit 102.

  This elastic yarn supply device 123 can stop the rotation of the rotating roller 126 by controlling the motor 124 when the elastic yarn 122 is broken, and can individually stop the rotation of the elastic yarn package 125 for each spinning unit 102. Yes.

  The elastic yarn 122 unwound from the elastic yarn package 125 passes through the air soccer device 130, a clamp cutter device (not shown), and the supply guide cylinder 131, and is supplied to a position slightly upstream of the front roller 118, and the fiber bundle 108. At the same time, it is introduced into the spinning member 109. Then, the fiber bundle 108 is wound around the outer periphery of the elastic yarn 122 by the swirling air flow generated by the spinning member 109, the core yarn 110 is spun, and is further sent downstream by the yarn feeding device 111. Note that the peripheral speed of the delivery roller 139 of the yarn feeder 111 is configured to be greater than the peripheral speed of the rotating roller 126, whereby the elastic yarn 122 is stretched to a predetermined stretch ratio (for example, 3 times). Thus, the fiber bundle 108 is wound around the spinning member 109 and spun.

  The winding device 112 is configured so that both ends in the axial direction of a bobbin (winding tube) 148 as a core of the package 145 can be rotatably held, and a driving drum 179 is brought into contact with the peripheral surface of the bobbin 148, The bobbin 148 is rotated so that the core yarn 110 can be taken up.

  As shown in FIGS. 5 and 6, the yarn joining cart 103 is provided with a carriage 142, a yarn joining device 143 such as a splicer provided on the carriage 142, and a carriage 142 that can be raised and lowered. However, the suction pipe 144 that sucks the yarn end that has been discharged from the spinning member 109 and passed through the yarn feeding device 111 and captures the yarn end and guides it to the yarn joining device 143, and the carriage 142 are provided so as to be able to be raised and lowered, and turn around the axis. However, it has a suction mouth 146 that sucks and captures the yarn end from the package 145 rotatably supported by the winding device 112 and guides it to the yarn joining device 143.

  As shown in FIG. 6, a traveling space 150 of the yarn splicing carriage 103 is formed inside the rear portion of the casing 106. The traveling space 150 is formed in an elongated shape along the direction in which the spinning units 102 are arranged. Rails 141 are disposed at the upper and lower portions of the traveling space 150, and traveling wheels 149 are provided at the lower portion of the carriage 142. With this configuration, the yarn splicing carriage 103 can travel in the traveling space 150 by driving the traveling wheels 149 while being guided in the traveling direction by the rail 141.

  A slab catcher 135 and a cutter device 136 are provided on the front side of the casing 106 of the spinning machine 101 and slightly below the yarn feeding device 111, and the detection unit of the slab catcher 135 serves as a spinning member. The core yarn 110 spun at 109 passes through before being wound by the winding device 112. The slab catcher 135 monitors the thickness of the traveling core yarn 110 and transmits a yarn defect detection signal when a fine yarn portion or a thick yarn portion (yarn defect) of the core yarn 110 is detected. Upon receiving this signal, the controller of the spinning unit 102 immediately operates the cutter device 136 to cut the core yarn 110, and temporarily stops the draft device 107, the spinning member 109, the elastic yarn supply device 123, etc. 103 is allowed to self-propel to the spinning unit 102. Thereafter, the spinning member 109 and the elastic yarn supply device 123 are re-driven to cause the yarn splicing carriage 103 to perform yarn splicing to resume spinning and winding.

  As shown in FIG. 7, the slab catcher (yarn clearer) 135 includes a light projecting unit 137 composed of a light emitting element such as an LED and a light receiving unit 138 composed of a photoelectric conversion element. The size (area) of a shadow formed on the light receiving unit 138 as a result of the light projected from the light projecting unit 137 being blocked by the core yarn 110 can be converted into a voltage signal by the light receiving unit 138. ing. In the present embodiment, a photoelectric conversion element having such a characteristic that the voltage value increases almost in proportion to the size of the shadow is used for the light receiving unit 138.

  In FIG. 7, the slab catcher controller 151 is formed of a known microcomputer, and includes a CPU (arithmetic unit), a ROM, a RAM (storage unit), and an interface (not shown). An appropriate program is stored in the storage means, and the control unit 156, the storage unit 152, the comparison unit 153, the light projection control unit 155, and the like are built in the slab catcher controller 151 by the hardware and the software. Has been.

  The storage unit 152 is mainly configured by a RAM, and is configured to be able to store a voltage value range (allowable voltage value) corresponding to a normal allowable thickness range of the core yarn 110, that is, a yarn monitoring threshold value. . The range of the allowable voltage value is determined by one or both of an upper limit threshold value and a lower limit threshold value, depending on the yarn defect to be detected. Further, the storage unit 152 is configured to be capable of storing a threshold value for determining the presence / absence of a core thread, which will be described later, in addition to the above-described threshold value for monitoring a thread. The control unit 156 controls the overall operation and performs communication with the controller on the spinning unit 102 side. A comparison unit 153 is configured inside the control unit 156, and the comparison unit 153 compares the voltage value input from the light receiving unit 138 with a threshold value for yarn monitoring.

  With this configuration, voltage signals from the light receiving unit 138 are input to the slab catcher controller 151 one after another, and the change in the thickness of the traveling core yarn 110 is monitored. That is, when the thickness (contour thickness) of the traveling core yarn 110 varies, the size of the shadow formed on the light receiving unit 138 varies, which appears as a variation in the voltage value output from the light receiving unit 138. The voltage value is digitally converted by the A / D converter 154, and then input to the comparison unit 153 to be compared with the above-described threshold value for yarn monitoring. When a yarn defect such as a thick yarn portion or a fine yarn portion exists in the core yarn 110 and the yarn defect passes through the detection unit 159, the fluctuation of the output voltage value of the light receiving unit becomes large and is determined by a threshold value for yarn monitoring. Out of range. The control unit 156 of the slab catcher controller 151 that has detected this by the comparison unit 153 sends a yarn defect signal to the control unit 157 of the controller of the spinning unit 102. When this is received, the spinning unit 102 side immediately sends a signal to the cutter device 136 to cut the core yarn 110, and a request for the yarn joining operation by the yarn joining device 143 occurs. At the same time, the spinning member 109, the elastic yarn supply device 123, the draft device 107, and the like are stopped, and the winding is interrupted. Thereafter, the control unit 157 of the spinning unit 102 causes the yarn splicing carriage 103 to self-travel to the position of the spinning unit 102. When the yarn joining carriage 103 arrives at the position of the spinning unit 102, the driving of the spinning member 109, the elastic yarn supplying device 123, etc. is resumed, and the yarn joining carriage 103 is caused to perform a predetermined yarn joining operation. The core yarn 110 and the core yarn 110 on the package 145 side are spliced.

  The driving voltage of the light projecting unit 137 can be changed by a variable voltage source 147, and the light projecting control unit 155 of the slab catcher controller 151 is connected to the variable voltage source 147. With this configuration, even if deterioration or temperature drift of the light projecting unit 137 occurs, the voltage value that the variable voltage source 147 gives to the light projecting unit 137 is changed so that the light projecting control unit 155 compensates for it. ing. As a result, stable yarn defect detection is realized.

  The doffing carriage 104 is provided independently of the yarn joining carriage 103, and as shown in FIGS. 5 and 6, along the traveling path 186 provided at the front of the spinning machine 101 main body, the spinning unit The vehicle can travel in the direction in which 102 are arranged. The traveling direction of the doffing carriage 104 is elongated along the direction in which the spinning units 102 are arranged, like the yarn splicing carriage 103. Further, the doffing carriage 104 is arranged so as to face each spinning unit 102 on the front side across the traveling path of the core yarn 110.

  As shown in FIGS. 5 and 6, the doffing carriage 104 has a carriage casing 185 that can run on the running path 186 by running wheels 187. The carriage casing 185 is provided with a suction pipe 188 as a core yarn capturing means, a chucker 189, and a bunch winding device (not shown). The suction pipe 188 is provided on the carriage casing 185 so as to be able to be lifted and retracted in order to capture the yarn end discharged from the spinning member 109 while sucking it and guide it to the winding device 112. The chucker 189 is rotatably provided on the carriage casing 185 in order to supply an empty bobbin 148 to the winding device 112.

  In addition, a guide 158 is installed in the upper part of the carriage casing 185, whereby the core yarn 110 is guided to the slab catcher 135 during the doffing operation. The detailed configuration of the guide 158 will be described later.

  A loading area 195 for the full-winding package 145 is set in front of the traveling path 186 of the doffing cart 104. On the other hand, the bogie casing 185 of the doffing bogie 104 is configured as a front view gate as shown in FIG. 5 and includes a package passage 193. As shown in FIG. 6, the package passage 193 includes an inclined floor 194 that becomes lower as the placement area 195 is approached. With this configuration, the fully wound package 145 removed by releasing the pinching of the bobbin 148 of the winding device 112 rolls over the inclined floor 194 through the package passage 193, and is placed in the mounting area 195. It falls into the shallow groove 196 formed in the bottom and stops. The full package 145 thus moved to the placement area 195 is collected by the operator and sent to the next process.

  Next, a doffing operation (doffing service) by the doffing cart 104 will be described with reference to FIG.

  When a sensor (not shown) detects that the package 145 is full in a spinning unit 102 among the plurality of spinning units 102, the controller of the spinning machine 101 detects the back roller 114 and the third roller 115 of the draft device 107. And the spinning member 109 are stopped, and the winding device 112 stops the rotational driving of the package 145. Then, a signal is sent to the doffing carriage 104 to travel to the front of the spinning unit 102. FIG. 6 shows a state where the doffing carriage 104 has traveled to the target spinning unit 102 and stopped. It is also possible to output a full-winding notice signal from the spinning unit 102 at the stage when the package is wound up to a full winding, and move the doffing carriage 104 to the corresponding unit 102 in advance and wait.

  After the doffing carriage 104 is stopped, the doffing carriage 104 releases the support state of the full-winding package 145 by appropriately operating the winding device 112 as shown in FIG. The fully wound package 145 removed from the winding device 112 passes through the package passage 193 in the doffing cart 104 so as to roll on the inclined floor 194, and falls into the groove 196 in the placement area 195 and stops.

  At substantially the same time as removing the full package 145 in this way, the doffing carriage 104 rotates the suction pipe 188 obliquely upward and extends it by a pneumatic cylinder (not shown), and its suction port is the delivery roller 139 and nip roller of the yarn feeder 111. It moves to just downstream of 140 (FIG. 8). Then, the core yarn 110 spun on the spinning member 109 side is sucked and captured.

  Further, as shown in FIG. 9, the chucker 189 sets an empty bobbin 148 that is stocked in the inside of the cart casing 185 and is not wound with a thread, to the winding device 112. Further, the suction pipe 188 in the extended state is retracted as shown in FIG. 9 and rotated downward so that the end of the yarn spun from the spinning member 109 is sucked into the vicinity of the empty bobbin 148. The bobbin 148 is guided and bunch-wound is performed on the bobbin 148 by a bunch winding device (not shown) so as to attach the yarn.

  At this time, as shown in FIG. 9, the guide 158 of the carriage casing 185 advances so as to project toward the spinning unit 102, and the core yarn 110 stretched between the yarn feeding device 111 and the suction pipe 188 is moved. The guide plate 173 at the tip of the guide guides the yarn path to pass through the detection portion of the slab catcher 135. In this state, the slab catcher 135 determines whether or not the core yarn 110 has the core yarn. This core yarn presence / absence determination method will be described later.

  Immediately after the above-described bunch winding is completed, the doffing carriage 104 brings the empty bobbin 148 into contact with the drive drum 179 and resumes the winding of the core yarn 110. The doffing operation (doffing service) is completed as described above, and the chucker 189, the suction pipe 188, and the guide 158 return to the initial positions shown in FIG. The operations of the chucker 189, the suction pipe 188, and the guide 158 described above are performed as a series of movements by driving a cam shaft (not shown) supported by the doffing carriage 104 by an electric motor (not shown). .

  Next, the determination of the presence or absence of the core yarn of the core yarn 110 by the slab catcher 135 will be described. FIG. 10 is a block diagram of a slab catcher when functioning as a core yarn presence / absence determining means, corresponding to FIG.

  That is, as described above with reference to FIGS. 6 and 7, the slab catcher 135 is provided for detecting a yarn defect when the core yarn 110 is wound by the winding device 112. It also functions as a determination device that determines whether or not the elastic yarn 122 is contained in the core yarn 110 during the doffing service. Hereinafter, this configuration will be described.

  That is, the spinning core yarn 110 sucked and captured by the suction pipe 188 at the time of the doffing service by the doffing cart 104 is drawn out for bunch winding, and the yarn path is shown in FIG. In this way, when the guide 158 of the doffing carriage 104 advances to the spinning unit 102 side, it is guided so as to pass through the detection unit of the slab catcher 135 and the cutter device 136. As a result, as shown in FIG. 10, the core yarn 110 continuously spun from the spinning member 109 is fed by the yarn feeding device 111, passes through the light projecting portion 137 of the cutter device 136 and the slab catcher 135, and then suctioned. It will be sucked into the pipe 188.

  Here, the core yarn 110 of this embodiment is spun by winding the fiber bundle 108 around the elastic yarn 122 as a core yarn in a stretched state. Contracts and expands slightly in the radial direction. Further, the core yarn 110 exhibits a sharpness due to the elastic force of the elastic yarn 122. In particular, if the suction force of the suction pipe 188 is set to be weak, the core yarn 110 that is weakly stretched between the yarn feeding device 111 and the suction pipe 188 has a stronger tendency to expand in the radial direction and tenderness. It will be.

  Therefore, when a normal core yarn 110 passes through the slab catcher 135 between the yarn feeder 111 and the suction pipe 144 at the time of doffing, the area of the shadow formed on the light receiving unit 138 increases, and the output voltage of the light receiving unit 138 is increased. Will increase. Further, due to the above-described margin, fluctuation (variation) in the output voltage of the light receiving unit 138 increases. On the other hand, when a defective core yarn that does not contain the elastic yarn 122 is spun from the spinning member 109 for some reason, the radial expansion tendency as described above does not appear. The output voltage of is almost not increased. In addition, since almost no blur occurs, the fluctuation of the output voltage of the light receiving unit 138 is small.

  By utilizing this, the slab catcher controller 151 stores the threshold voltage for core yarn presence / absence determination in the storage unit 152 in addition to the threshold for yarn monitoring, as described above, and the voltage input from the light receiving unit 138. The comparison unit 153 determines whether the value exceeds the threshold value. As a result, if the voltage value is equal to or higher than the threshold value, it is determined that the core yarn 110 is normal with the elastic yarn 122, and if the voltage value is lower than the threshold value, it is determined that the core yarn is defective with no elastic yarn 122.

  When it is determined that the core yarn does not contain the elastic yarn 122, the control unit 156 of the slab catcher controller 151 sends a no core yarn detection signal to the control unit 157 on the spinning unit 102 side. Upon receiving this, the spinning unit 102 immediately cuts the defective core yarn by the cutter device 136, notifies the abnormality and stops, and prompts the operator to remove the abnormality.

  The determination principle of the presence / absence of the core yarn is substantially the same as the determination of the presence / absence of the core yarn performed at the time of yarn joining in the first embodiment (see the experimental result of FIG. 4). Therefore, also in the second embodiment, the presence or absence of the elastic yarn 122 as the core yarn can be accurately detected.

  Next, the configuration of the guide 158 for guiding the core yarn 110 to the slab catcher 135 during the doffing will be described in detail with reference to FIG. FIG. 11 is a perspective view of the guide immediately after the doffing operation in the doffing cart is started, as viewed from the doffing cart side. FIG. 12 is a perspective view showing a state in which the guide is swung from the retracted state, protrudes toward the spinning unit, and approaches the yarn path by the yarn guide plate. FIG. 13 is a perspective view showing how the pneumatic cylinder is further extended to guide the core yarn to the slab catcher. FIG. 14 is a perspective view showing a state in which the yarn path is removed from the yarn gathering plate. FIG. 15 is a perspective view showing a state in which the yarn path guide by the guide is completed.

  As shown in FIG. 11, the guide 158 is installed on the upper surface of the carriage casing 185 of the doffing carriage 104, and includes a first arm 161 and a second arm 162 that are stacked one above the other. These two arms 161 and 162 are rotatably supported around a support shaft 167 provided upright on the upper surface of the carriage casing 185. A drive arm 160 is rotatably provided inside the carriage casing 185, and the tip of the drive arm 160 is connected to one end of the first arm 161 via a rod 168. The drive arm 160 is connected to the camshaft (not shown) for driving the suction pipe 188, the chucker 189, and the like in a linked manner.

  Each of the first arm 161 and the second arm 162 is formed by bending the tip side into a hook shape. A thread removing plate 171 is provided at the tip of the first arm 161, and a thread guide is provided at the tip of the second arm 162. Plates 172 are each attached. The support shaft 167 incorporates an urging spring (not shown), and the urging spring causes the second arm 162 to rotate relative to the first arm 161 in the clockwise direction in FIG. Be forced. However, the rotation is restricted by the protrusion 164 formed on the second arm 162 coming into contact with the first arm 161.

  A pneumatic cylinder 163 is installed on the upper surface of the second arm 162 located on the upper side of the two arms 161 and 162. A guide plate 173 for guiding the yarn path is fixed to the tip of the movable portion of the pneumatic cylinder 163. A guide groove 174 into which the core yarn 110 can be inserted is formed at the cylinder extension side end of the guide plate 173.

  With the above configuration, FIG. 11 shows a state where the suction pipe 188 of the doffing carriage 104 is retracted while sucking and capturing the core yarn 110. As shown in FIG. 11, the guide 158 is in a state of being retracted without protruding from the upper part of the doffing carriage 104 until the tip of the suction pipe 188 passes in front of the slab catcher 135 and descends further downward. Is maintained.

  Immediately after the tip of the suction pipe 188 passes below the slab catcher 135, the drive arm 160 is driven by a camshaft (not shown), and the drive arm 160 passes through a rod 168 as shown in FIG. Then, the first arm 161 is pulled and rotated. The second arm 162 is also rotated so as to follow the first arm 161 by an urging spring incorporated in the support shaft 167. As a result, the yarn guide plate 172 of the second arm 162 comes into contact with the core yarn 110 and slightly moves the yarn path to the right side. In this state, the yarn removing plate 171 of the first arm 161 is not in contact with the yarn path.

  In the state shown in FIG. 12, the pneumatic cylinder 163 is in a retracted state, and the above-described guide plate 173 is located slightly on the near side (the doffing cart 104 side) from the yarn path of the core yarn 110. In FIG. 12, the yarn path of the core yarn 110 and the guide groove 174 of the guide plate 173 are illustrated so as to overlap each other. However, in the state of FIG. 12, the core yarn 110 has not yet been inserted into the guide groove 174.

  When the above-described two arms 161 and 162 are turned, and the arms 161 and 162 project from the doffing carriage 104, compressed air is supplied to the pneumatic cylinder 163 and the pneumatic cylinder 163 extends. . As a result, as shown in FIG. 13, the guide plate 173 advances while the core yarn 110 is inserted into the guide groove 174 and is positioned just below the slab catcher 135 on the spinning unit 102 side. As a result, the core yarn 110 delivered from the yarn feeder 111 is guided by the guide plate 173 and the guide groove 174 so as to pass through the cutter device 136 and the slab catcher 135.

  Immediately after the above-described advancement of the guide plate 173, the driving arm 160 further rotates the first arm 161 through the rod 168. The second arm 162 also tries to rotate following the urging spring built in the support shaft 167, but the restriction projection 165 formed on the second arm 162 is fixed to the upper surface of the carriage casing 185. The contact with the stopper 166 is prevented. As a result, as shown in FIG. 14, only the first arm 161 turns slightly, and the thread removing plate 171 at the tip thereof contacts the core yarn 110, and the yarn path is further moved to the right side. The arm 162 comes off the yarn guide plate 172. The first arm 161 is returned to its original position (thread removal operation) in a short time. As a result, as shown in FIGS. 15 and 9, the core yarn 110 is guided only by the guide groove of the guide plate 173. Become. The core yarn presence / absence determination shown in FIG. 10 is performed before the first arm 161 is returned to its original state.

  The above is the guide operation of the guide 158 with respect to the core yarn 110 for determining the presence / absence of the core yarn. After the presence / absence determination of the core yarn by the slab catcher 135, the pneumatic cylinder 163 is retracted and the guide plate 173 is moved to the doffing cart 104 side. With this, the core yarn 110 is pulled out of the guide groove 174 of the guide plate 173. Then, the drive arm 160 turns the two arms 161 and 162 so as to return to the original retracted position. Thus, a series of operations of the guide 158 is completed, and the guide 158 returns to the retracted state of FIG.

  The guide to the core yarn 110 by the guide 158 is completed at a stage before the doffing operation of the doffing carriage 104 (referring to a series of operations including collection of full packages and bunch winding) is completed ( More specifically, the operation timing of each of the arms 161 and 162 and the pneumatic cylinder 163 is determined so that the bunch winding by the above-described bunch winding device is completed). That is, the presence / absence determination of the core yarn can be performed simultaneously during the doffing operation, and the working time is shortened. In particular, by setting the timing so as to end the core yarn presence / absence determination by the slab catcher 135 at the time before the bunch winding, the work time can be made almost zero. Even when it is determined by the slab catcher 135 that there is a defective core yarn having no core yarn, since it is in a state before the bunch winding, it is easy to recover from the abnormality.

  As described above, in the core yarn spinning machine 101 of the present embodiment, the slab catcher 135 as the core yarn presence / absence determining means for determining the presence / absence of the core yarn of the core yarn 110 at the time of the doffing service by the doffing cart 104, The core yarn 110 is guided. Accordingly, it is possible to perform the core yarn presence / absence determination operation in parallel during the doffing operation, and it is possible to reliably detect the absence of the core yarn of the core yarn without increasing the operation stop time of the spinning unit 102.

  Further, the guidance of the core yarn 110 to the slab catcher 135 is performed at a timing before the end of the doffing service. Therefore, it becomes easy to finish the core yarn presence / absence determination of the core yarn 110 during the doffing service time, and an increase in the winding stop time of the spinning unit 102 can be suppressed.

  More specifically, by making the determination of the presence or absence of the core yarn of the slab catcher 135 at the timing before the end of the doffing service, the increase in the winding stop time of the spinning unit 102 can be made zero. In addition, since the presence / absence determination of the core yarn is performed at the timing before the doffing service ends and the winding is resumed, even if the determination of the absence of the core yarn is made by the slab catcher 135, it is easy to recover from the abnormality. It is.

  The doffing truck 104 that performs the doffing service captures the core yarn 110 by the suction pipe 188 in the doffing service for the spinning unit 102, and the captured core yarn 110 is installed on the spinning unit 102 side. Guide to 135. That is, when the doffing truck 104 captures the core yarn 110 by the suction pipe 188 for doffing, the core yarn 110 can be easily guided to the slab catcher 135 of the spinning unit 102. Therefore, the presence or absence of the elastic yarn 122 by the slab catcher 135 can be reliably determined.

  The slab catcher 135 is provided in the spinning unit 102, and the doffing carriage 104 is disposed facing the spinning unit 102, and the core yarn 110 is guided to the slab catcher 135 on the doffing carriage 104 side. A movable guide 158 is provided. Therefore, when the guide 158 moves, the core yarn 110 can be easily guided from the doffing carriage 104 to the slab catcher 135 on the spinning unit 102 facing it.

  Furthermore, the guide 158 is configured to be retracted to the doffing cart 104 except during the doffing operation. Therefore, except when guiding the core yarn 110, the guide 158 is retracted to the doffing carriage 104 side as shown in FIGS. 11 and 8, so that the traveling core yarn 110, the spinning unit 102, and the yarn joining carriage 103 side parts. And the guide 158 are avoided, and the core yarn spinning machine 101 can be smoothly operated. This effect is exhibited particularly well when the doffing device (doffing carriage 104) is configured to travel between the plurality of spinning units 102 as in this embodiment. That is, the guide 158 is retracted when the doffing carriage 104 is traveling, so that the guide 158 is prevented from interfering with the components on the spinning unit 102 side, and the traveling of the doffing carriage 104 and the operation of each spinning unit 102 are prevented. Become smooth.

  The guide 158 is configured to capture the core yarn 110 and guide it to the slab catcher 135 by a turning operation and an extending operation of the core yarn 110 toward the yarn path. Accordingly, the core yarn 110 can be accurately guided to the slab catcher 135 on the spinning unit 102 side facing the doffing carriage 104. Further, in the retracted state before turning and extending, the guide 158 can be stored in a compact space as shown in FIG. 11, and the doffing cart 104 can be easily downsized.

  Further, the core yarn presence / absence determining means also serves as a slab catcher 135 installed on the spinning unit 102 side for detecting yarn defects. Therefore, it is not necessary to provide a special device for determining the presence or absence of the core yarn, and the configuration is further simplified.

  The core yarn spinning machine 101 of this embodiment has a plurality of spinning units 102, and the doffing carriage 104 is configured to be able to travel between the plurality of spinning units 102. Accordingly, since one doffing carriage 104 can take charge of doffing services for a plurality of spinning units 102, the required number of doffing devices is reduced, the configuration is further simplified, and the manufacturing cost is reduced. Can be reduced.

  The preferred embodiment of the present invention has been described above, but the technical scope of the present invention is not limited to the above configuration, and can be implemented with the following modifications, for example.

  (1) The service in the core yarn spinning machine is not limited to the doffing service, and for example, a yarn splicing service can be considered. That is, a yarn joining cart that can run along the above-described running path 186 (that is, so as to face the spinning unit 102) may be provided, and the guide 158 may be provided on the yarn joining cart. In this case, it is preferable that the guide of the yarn path to the slab catcher 135 is performed by the guide 158 at a timing before the yarn joining service by the yarn joining cart is completed.

  (2) Although the core yarn presence / absence determining means is also used as the slab catcher 135 in the second embodiment as in the first embodiment, the slab catcher 135 is also used in the second embodiment. A core yarn presence / absence determining means may be provided separately.

  (3) In the above embodiment, the presence or absence of the core yarn is determined based on whether or not the output voltage of the light receiving unit 138 corresponding to the size of the contour (contour thickness) exceeds a predetermined threshold when determining the presence or absence of the core yarn. For example, the slab catcher controller 151 has a function of calculating a variation in the output voltage of the light receiving unit 138, for example, a standard deviation, and the presence or absence of the core yarn is determined depending on whether or not the variation exceeds a predetermined threshold value. You may judge. Further, the presence / absence of the core yarn may be determined in combination from both the thickness of the core yarn detected by the light receiving unit 138 and its fluctuation. Here, the “outline thickness” does not mean the actual thickness of the core yarn 110, but the interval between the outlines of the shadows when viewed from the radial direction.

  (4) The slab catcher as the yarn defect detector or the core yarn presence / absence determination device is not limited to the so-called photoelectric type in the second embodiment, as in the first embodiment. A type of slab catcher can be employed.

  (5) Further, the guide 158 guides the core yarn 110 by turning operation → extension operation. However, the guide 158 is not limited to this, and may be configured to guide the core yarn 110 only by simply turning operation or extending operation. it can. However, it is preferable that the turning operation and the extension operation are sequentially performed as in the above embodiment because the guide 158 at the retracted position can be accommodated in a compact space without interfering with other components.

  (6) The doffing carriage 104 is configured to be able to travel between the spinning units 102. However, the doffing apparatus is not limited thereto, and the doffing apparatus may be simply arranged so as not to move.

  (7) The present invention is not limited to the spinning machine including the spinning member having the above-described configuration, and can be applied to a spinning machine including a spinning member having another configuration.

(8) The present invention is not limited to the determination of the presence / absence of the core yarn in the doffing operation of the doffing carriage 104, and includes the determination of the presence / absence of the core yarn in the yarn joining operation of the yarn joining cart 103. In this case, the guide means corresponds to the suction pipe 144. That is, “service” includes both yarn splicing and doffing.

The present invention relates to a core yarn spinning machine capable of determining the presence or absence of a core yarn. The present invention also relates to a core yarn presence / absence determination method for determining whether a core yarn is contained in a core yarn.
Furthermore, the invention relates to a method for performing some service in a core yarn spinning machine.

The core yarn spinning machine disclosed in Patent Document 1 is an air spinning device for an elastic yarn as a core yarn supplied from an elastic yarn supply device and a fiber bundle (covering fiber) drafted by a draft device. It is configured to produce a core yarn having a structure in which a core yarn is wrapped with covering fibers by air spinning. The core yarn spinning machine is provided with a winding device for winding the core yarn as a package, and a slab catcher (yarn monitoring means) for detecting yarn defects such as yarn unevenness in the core yarn fed to the winding device. . The elastic yarn supply device is provided with an elastic yarn detection sensor for detecting the elastic yarn, and when the sensor detects that there is no elastic yarn, the spinning operation is automatically stopped.
Japan, Japanese Patent Laid-Open No. 2002-363834 (FIG. 4, paragraph number 0058 for elastic yarn detection sensor (reference numeral 32))

  In Patent Document 1, since the elastic yarn detection sensor is provided on the upstream side of the pneumatic spinning device, the elastic yarn is detected on the downstream side of the pneumatic spinning device even though the elastic yarn sensor detects the elastic yarn. The case where it does not enter the inside of the covering fiber is considered. For example, when spinning of the core yarn is started, the elastic yarn may be sucked into the suction nozzle so as to pass through the side of the pneumatic spinning device, and the yarn of only the covering fiber may be spun from the pneumatic spinning device. If such a coreless yarn is wound on a package, it causes a significant deterioration of the package quality.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a detection method capable of reliably detecting whether or not a core yarn is contained in a core yarn, and a core yarn spinning machine capable of such detection. It is to provide.
Another object of the present invention is to provide means capable of performing such detection while minimizing the operation stop time of the textile machine.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  According to a first aspect of the present invention, there is provided a core yarn spinning machine configured as follows. That is, a spinning device that spins the core yarn and a winding device that winds the spun core yarn are provided. A core yarn presence / absence determining means for determining the presence / absence of the core yarn of the core yarn, at a time before winding from the start of spinning of the core yarn in the spinning device to the start of winding of the core yarn by the winding device; Then, the spun core yarn is introduced into the core yarn presence / absence determining means.

Thereby, the presence or absence of the core yarn can be determined before the core yarn is wound, and the yarn without the core yarn can be prevented from being wound on the package. Therefore, a good quality winding package can be formed.
In addition, this time before winding is specifically at the time of piecing where the starting end of the core yarn on the side where spinning was started in the spinning device after yarn breakage and the end of the core yarn wound on the winding device are joined together. At the time of doffing when the full package wound by the winding device is replaced with an empty winding tube on which the yarn is not wound and the yarn is attached to the winding tube. This is the time before thread installation. When doffing, it includes the case where the yarn is not yet wound by the winding device and only the operation of attaching the yarn to the empty winding tube attached to the winding device is performed.

In the core yarn spinning machine, the presence of the core yarn in the core yarn is more when the core yarn is introduced into the core yarn presence / absence determining means than when the core yarn is wound by the winding device. It is preferable to make it manifest .
That is, when the core yarn is introduced into the core yarn presence / absence determining means, if the presence of the core yarn becomes more obvious than the time after the start of winding by the winding device, the determination by the core yarn presence / absence determining means is more reliably performed. It can be carried out. Further, since the presence of the core yarn is revealed using the core yarn before winding by the winding device, the core yarn subjected to the core yarn revealing process is wound by the winding device to reduce the quality. There is nothing.
Here, the manifestation of the presence of the core yarn is a process that makes the presence of the core yarn noticeable if the core yarn is present. For example, the core yarn has a predetermined value compared to the case where the core yarn is not present. A process that causes a change (for example, a process that loosens an elastic core yarn core yarn described later) or a process that increases the ratio of the thickness of the core yarn to the total thickness of the core yarn. Say.

In the core yarn spinning machine, the core yarn of the core yarn is an elastic yarn, and the core yarn presence / absence determining means determines that the core yarn is present when the thickness of the core yarn or a variation thereof is larger than a threshold value. The manifestation of the presence of the core yarn is preferably performed by reducing the tension of the core yarn or loosening the core yarn from the time after the start of winding.
That is, when the core yarn of the core yarn is an elastic yarn rich in stretchability, the normal core yarn having the core yarn contracts depending on the tensile force in the length direction and expands in the radial direction. For this reason, if the tension is weakened or slackened from the time after the start of winding the core yarn, in the case of a normal core yarn having a core yarn, the thickness of the core yarn detected by the core yarn presence / absence determining means or its variation is detected. There is a tendency to grow. On the other hand, in the case of an abnormal core yarn without a core yarn, the above tendency is not observed. Accordingly, the tension of the core yarn is made weaker or slacker than the time after the start of winding, and based on whether the thickness of the core yarn detected by the core yarn presence / absence determining means or the variation thereof is larger than a predetermined value. When the presence / absence is determined, whether or not the core yarn is contained in the core yarn can be accurately detected.

In the core yarn spinning machine, the core yarn presence / absence determining means is also a yarn monitoring means at a time after the start of winding, and the core yarn presence / absence determining means sets a threshold value for determining the presence / absence of core yarn after the start of winding. It is preferable to have it separately from the threshold for yarn monitoring at this time.
Accordingly, the core yarn presence / absence determining means and the yarn monitoring means can be made common, and both the presence / absence of the core yarn and the yarn monitoring can be accurately performed using different threshold values according to the purpose.

  According to the second aspect of the present invention, in the core yarn presence / absence determination method for determining the presence / absence of a core yarn in the core yarn, the core yarn in which the presence of the core yarn is made more obvious than in a normal state is used. There is provided a core yarn core yarn presence / absence determination method that determines that the core yarn is present when the thickness of the core yarn detected by the detection unit or the variation thereof is larger than a predetermined value.

  In other words, when the core yarn is made more obvious than the normal state, the detection unit detects the normal core yarn having the core yarn compared to the abnormal core yarn without the core yarn. The thickness of the core yarn or its variation increases. Accordingly, when the presence or absence of the core yarn is determined based on whether the thickness of the core yarn detected by the detection unit or the variation thereof is greater than a predetermined value, it is possible to accurately detect whether or not the core yarn is contained in the core yarn. Can do.

  In the core yarn core yarn presence / absence determination method, when the core yarn of the core yarn is an elastic yarn, the presence of the core yarn is manifested by weakening the tension of the core yarn or lowering the core yarn. It is preferably done by loosening.

  That is, when the core yarn of the core yarn is an elastic yarn rich in stretchability, the normal core yarn having the core yarn contracts depending on the tensile force in the length direction and expands in the radial direction. For this reason, when the tension of the core yarn is weakened or slackened from the normal state, in the case of a normal core yarn having a core yarn, the thickness of the core yarn detected by the detection unit or its variation tends to increase. On the other hand, in the case of an abnormal core yarn without a core yarn, the above tendency is not observed. Therefore, when the presence or absence of the core yarn is determined based on whether the core yarn thickness detected by the detection unit or the variation thereof is greater than a predetermined value, the core yarn is weakened or slackened from the normal state. It is possible to accurately detect whether or not the core yarn is contained in.

  According to a third aspect of the present invention, there is provided a service method in a core yarn spinning machine, wherein the core yarn is guided to a core yarn presence / absence judging means for judging the presence / absence of a core yarn of the core yarn at the time of the service. A service method is provided.

  Thereby, during any service work in the core yarn spinning machine, for example, during the yarn splicing work accompanied by the spinning start work, during the doffing work, etc., the spinning machine determines the presence or absence of the core yarn by the core yarn presence / absence judging means. Without increasing the winding stop time, it is possible to reliably detect the absence of the core yarn of the core yarn and prevent deterioration of the package quality.

In the above service method, it is preferable that the guide to the core yarn presence / absence determining means of the core yarn is performed at a timing before the service for the yarn winding is finished.
Thereby, it becomes easy to end the core yarn presence / absence determination during the service time, and the increase in the winding stop time of the spinning machine can be suppressed.

In the service method, it is preferable that the determination of the presence / absence of the core yarn by the core yarn presence / absence determination means is performed at a timing before the service ends.
Thereby, the increase in the winding stop time of the spinning machine can be made zero. In addition, since the presence / absence determination of the core yarn is performed at the timing before the service is finished and the winding is resumed, even if the determination of the absence of the core yarn is made by the means for determining the presence / absence of the core yarn, it is easy to recover from the abnormality. is there.

  According to the 4th viewpoint of this invention, the core yarn spinning machine comprised as follows is provided. That is, it has a unit for spinning and winding the core yarn, and a service device for providing a service to the unit. Core yarn presence / absence determining means for determining the presence / absence of core yarn of the core yarn, and guide means for capturing the core yarn at the time of servicing the unit and guiding the captured core yarn to the core yarn presence / absence determining means are provided.

  Thus, the core yarn can be easily guided to the core yarn presence / absence determining means by capturing the core yarn at the time of service. Therefore, the presence / absence of the core yarn can be reliably determined during service work.

In the core yarn spinning machine, the core yarn presence / absence determining means is provided in the unit, the service device is arranged facing the unit, and the guiding means guides the core yarn to the core yarn presence / absence determining means. It is preferable that a movable guide is provided on the service device side.
Accordingly, the core yarn can be easily guided from the service device to the core yarn presence / absence determining means by moving the guide.

In the core yarn spinning machine, the guide is preferably retracted to the service device side when the service is not performed.
As a result, the guide is retracted to the service device side at times other than during service, so that interference between the traveling core yarn or unit side parts and the guide is avoided, and smooth winding becomes possible.

In the core yarn spinning machine, it is preferable that the guide swirls from the retracted state and extends toward the yarn path side of the core yarn to catch the core yarn and guide it to the core yarn presence / absence determining means.
Thereby, the core yarn can be accurately guided to the core yarn presence / absence determining means. Further, in the retracted state before turning and extending, the guide can be made compact, and the service device can be miniaturized.

In the core yarn spinning machine, it is preferable that the core yarn presence / absence determining means also serves as a yarn defect detecting means installed on the unit side.
This eliminates the need for specially providing a core yarn presence / absence determining means, and further simplifies the configuration.

In the core yarn spinning machine, it is preferable that a plurality of units are arranged in parallel, and the service device is configured to be able to travel between the plurality of units.
As a result, a plurality of units can be handled by a single service device, so that the configuration is further simplified and the manufacturing cost can be reduced.

1 is a front view of a core yarn spinning machine according to an embodiment of the present invention. The side view showing the core yarn spinning machine as a longitudinal section. The block diagram of the slab catcher which functions as a core yarn presence determination means of the core yarn spinning machine. The graph which shows the difference in the output voltage of the light-receiving part of a slab catcher by the presence or absence of the core yarn inside a core yarn. The front view of the core yarn spinning machine which concerns on 2nd embodiment of this invention. The side view showing the core yarn spinning machine as a longitudinal section. The block diagram of the slab catcher which functions as a core yarn presence determination means of the core yarn spinning machine. The side view which shows a mode that the doffing operation | movement of the doffing cart is started, the full package is removed, and the core yarn is sucked and supplemented with a suction pipe in the same core yarn spinning machine. The side view which shows a mode that while pulling out a core yarn from the state of FIG. 8 and guiding the core yarn to a slab catcher with a guide. FIG. 10 is a block diagram of a slab catcher that functions as a core yarn presence / absence determination unit, corresponding to FIG. 9. The perspective view seen from the doffing cart side which shows the mode of the guide immediately after the doffing operation | movement in the doffing cart was started. The perspective view which shows a mode that a guide is turned from a retracted state, is projected to the spinning unit side, and a yarn path is brought close by a yarn guide plate. The perspective view which shows a mode that a pneumatic cylinder is extended further and guides a core yarn to a slab catcher. The perspective view which shows a mode that a thread path is removed from a thread gathering board. The perspective view which shows a mode that the yarn path guidance by a guide was completed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Core yarn spinning machine 2 Spinning unit 9 Spinning device 11 Yarn feeding device 12 Winding device 22 Elastic yarn (core yarn)
35 Slab catcher (yarn defect detector, core yarn presence / absence judging device, core yarn presence / absence judging means)
43 Yarn splicing device 44 Suction pipe (capture introduction means, core yarn revealing means)
101 core yarn spinning machine 102 units (spinning unit)
104 doffing equipment (service equipment, service cart)
110 Core yarn 122 Elastic thread (core thread)
135 Slab catcher (core yarn presence / absence determination means, core yarn presence / absence determination device, yarn defect detection means)
158 Guide 188 Suction pipe (core yarn catching means, core yarn revealing means)

  Hereinafter, a preferred first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows a core yarn spinning machine 1 having a large number of spinning units 2 arranged side by side. The spinning machine 1 is equipped with a yarn splicing carriage (service device) 3, a blower box 4, and a prime mover box 5 provided so as to be able to run in the direction in which the spinning units 2 are arranged.

  As shown in FIG. 1, each spinning unit 2 has a draft device 7, a spinning device 9, a yarn feeding device 11, and a winding device 12 as main components. The draft device 7 is provided in the vicinity of the upper end of the casing 6 of the spinning machine 1, and the fiber bundle 8 sent from the draft device 7 is spun by the spinning device 9. A spun yarn (core yarn) 10 discharged from the spinning device 9 is sent downward, and a slab catcher (yarn defect detector, yarn monitoring means) for detecting a yarn defect, cutting the yarn and removing the yarn defect portion. After passing through 35, the take-up device 12 takes up a bobbin as a take-up tube to form a package 45. For example, the slab catcher 35 can be considered to have a function of detecting a defect in yarn thickness unevenness, a function of detecting foreign matter mixed in the spun yarn 10, or a combination of these functions.

  As shown in FIG. 2, the draft device 7 is for drawing the sliver 13 into a fiber bundle 8, and includes a middle roller 17 and a front roller 18 on which a back roller 14, a third roller 15, and an apron belt 16 are mounted. These four rollers are used.

  The yarn feeding device 11 includes a delivery roller 19 supported by the casing 6 of the spinning machine 1 and a nip roller 20 provided so as to be in contact with the delivery roller 19. With this configuration, the core yarn 10 discharged from the spinning device 9 is sandwiched between the delivery roller 19 and the nip roller 20, and the delivery roller 19 is rotationally driven, whereby the core yarn 10 is sent to the winding device 12 side.

  An elastic yarn supply device 23 is provided above the draft device 7. The elastic yarn 22 supplied from the elastic yarn supply device 23 joins the fiber bundle 8 from between the front roller 18 and the middle roller 17, passes through the front roller 18 together with the fiber bundle 8, and is introduced into the spinning device 9. It is configured to be.

  In the elastic yarn supplying device 23, a rotating roller 26 that rotates in contact with the peripheral surface of the elastic yarn package 25 and a motor 24 that rotates the rotating roller 26 via a belt 28 are provided for each spinning unit 2. It is attached. The elastic yarn package 25 is rotatably supported by a cradle arm 27 pivotally supported.

  With the above configuration, the elastic yarn 22 unwound from the elastic yarn package 25 passes through the air soccer device 30, a clamp cutter device (not shown), and the supply guide cylinder 31, and is supplied to a position slightly upstream of the front roller 18. The fiber bundle 8 is introduced into the spinning device 9. Then, the fiber bundle 8 is wound around the outer periphery of the elastic yarn 22 by the swirling air flow generated by the spinning device 9, and the core yarn 10 having the elastic yarn rich in elasticity as the core yarn is spun. Further, it is sent downstream. Note that the peripheral speed of the delivery roller 19 of the yarn feeder 11 is configured to be greater than the peripheral speed of the rotating roller 26, whereby the elastic yarn 22 is stretched to a predetermined stretch ratio (for example, 3 times). Thus, the fiber bundle 8 is wound and spun by the spinning device 9.

  As shown in FIG. 1, the yarn joining cart 3 is provided so as to travel along a rail 41 provided in the casing 6 of the spinning machine 1 main body. The yarn joining cart 3 includes a yarn joining device 43 made of, for example, a splicer, and a yarn end of the core yarn 10 that is provided on the yarn joining cart 3 so as to be freely raised and lowered and that is discharged from the spinning device 9 while turning around an axis. A suction pipe 44 that captures the yarn while sucking it and guides it to the yarn joining device 43, and a package 45 that is provided on the yarn joining cart 3 so as to be able to be raised and lowered, and is rotatably supported by the winding device 12 while turning around the shaft. A suction mouth 46 that sucks and captures the yarn end and guides it to the yarn splicing device 43.

  A slab catcher 35 and a cutter device 36 are provided on the front side of the casing 6 of the spinning machine 1, and the core yarn 10 spun by the spinning device 9 passes through a detection portion of the slab catcher 35. . The slab catcher 35 monitors the thickness of the traveling core yarn 10 and transmits a yarn defect detection signal when a fine yarn portion or a thick yarn portion (yarn defect) of the core yarn 10 is detected. Upon receiving this signal, the controller of the spinning unit 2 immediately operates the cutter device 36 to cut the core yarn 10, and temporarily stops the draft device 7, the spinning device 9, the elastic yarn supplying device 23, etc. 3 to self-propelled to the front of the spinning unit 2. Thereafter, the spinning device 9 and the elastic yarn supply device 23 are re-driven, and the yarn joining cart 3 is spliced to resume spinning and winding.

  As shown in FIG. 3, the slab catcher (yarn clearer) 35 includes a light projecting unit 37 including a light emitting element such as an LED and a light receiving unit 38 including a photoelectric conversion element. The size (area) of a shadow formed on the light receiving unit 38 as a result of the light projected from the light projecting unit 37 being blocked by the core yarn 10 can be converted into a voltage signal by the light receiving unit 38. ing. As the light receiving unit 38 of the present embodiment, a photoelectric conversion element having a characteristic in which the voltage value increases almost in proportion to the size of the shadow is used.

  The slab catcher controller 51 is a known microcomputer, and includes a CPU (arithmetic means), a ROM, a RAM (storage means), and an interface (not shown). An appropriate program is provided in the storage means, and the control unit 56, the storage unit 52, the comparison unit 53, the light projection control unit 55, etc. are built in the slab catcher controller 51 by the hardware and the software. Has been.

  The storage unit 52 is mainly composed of a RAM, and stores a voltage value range (allowable voltage value) corresponding to the allowable range of the thickness of the normal core yarn 10, that is, a threshold value for yarn monitoring. A threshold value for determining the presence / absence of a core yarn, which will be described later, can also be stored. The control unit 56 controls the overall operation and performs communication with the controller on the spinning unit 2 side. A comparison unit 53 is configured inside the control unit 56, and the comparison unit 53 compares the voltage value input from the light receiving unit 38 with the allowable voltage value.

  With this configuration, voltage signals from the light receiving unit 38 are successively input to the slab catcher controller 51 to monitor changes in the thickness of the traveling core yarn 10. That is, when the thickness (contour thickness) of the traveling core yarn 10 varies, the size of the shadow formed on the light receiving unit 38 varies, which appears as a variation in the voltage value output from the light receiving unit 38. This voltage value is digitally converted by the A / D converter 54 and then input to the comparison unit 53 where it is compared with the allowable voltage value. When the core yarn 10 has a yarn defect such as a thick yarn portion or a fine yarn portion, and the yarn defect passes through the detection unit 39, the output voltage value of the light receiving unit changes and falls outside the allowable voltage value range. The control unit 56 of the slab catcher controller 51 that has detected this by the comparison unit 53 sends a yarn defect signal to the control unit 57 of the controller of the spinning unit 2. When this is received, the spinning unit 2 side immediately sends a signal to the cutter device 36 to cut the core yarn 10, and a request for the yarn joining operation by the yarn joining device 43 is generated. At the same time, the spinning device 9, the elastic yarn supply device 23, the draft device 7 and the like are stopped, and the winding is interrupted. Thereafter, the control unit 57 of the spinning unit 2 sends a signal to the control unit 60 of the yarn splicing cart 3 so that the spinning unit 2 moves to the position of the spinning unit 2. When the yarn joining cart 3 arrives at the position of the spinning unit 2, the spinning device 9, the elastic yarn supplying device 23 and the like are resumed, and the yarn joining cart 3 performs a predetermined yarn joining operation, so that the core yarn on the spinning side 10 and the end of the core yarn 10 on the package 45 side are joined together for piecing.

  The driving voltage of the light projecting unit 37 can be changed by a variable voltage source 48, and the light projecting control unit 55 of the slab catcher controller 51 is connected to the variable voltage source 48. With this configuration, even if deterioration or temperature drift of the light projecting unit 37 occurs, the voltage value that the variable voltage source 48 gives to the light projecting unit 37 is changed so that the light projecting control unit 55 compensates for it. ing. As a result, stable yarn defect detection is realized.

  The above operation is a normal operation of the slab catcher 35 when the core yarn 10 is taken up by the winding device 12. In this embodiment, the slab catcher 35 is operated at the time of yarn joining (in other words, the core yarn in the spinning device 9). As a determination device for determining whether or not the elastic yarn 22 is contained in the core yarn 10 at a time before winding of the core yarn 10 is started by the winding device 12 after starting spinning of the core 10. Also works. Hereinafter, this configuration will be described.

  That is, when the yarn breakage occurs in the core yarn 10 or when the yarn defect of the core yarn 10 is detected by the slab catcher 35 and the core yarn 10 is cut by the cutter device 36, the yarn joining cart 3 has started the spinning device 9 that has started spinning. The core yarn 10 on the side and the core yarn on the winding device 12 side are spliced by the yarn splicing device 43. At this stage, the winding of the core yarn 10 by the winding device 12 is stopped.

  At this time, the core yarn 10 spun in the spinning device 9 and sucked and captured by the suction pipe 44 is guided so that its yarn path passes through the detection unit 39 and the cutter device 36 of the slab catcher 35 as shown in FIG. . As a result, the core yarn 10 continuously spun from the spinning device 9 is fed by the yarn feeding device 11, passes through the cutter device 36 and the light projecting unit 37, and is then sucked into the suction pipe 44.

  The suction of the core yarn 10 by the suction pipe 44 is performed by the suction flow generation source 62. The suction force of the suction flow generation source 62 is slightly weaker than the yarn feeding force of the yarn feeding device 11. The suction force setting unit 61 of the controller of the yarn splicing cart 3 is set. For this reason, the tension of the core yarn 10 between the yarn feeding device 11 and the suction pipe 44 is smaller than the tension of the core yarn 10 in the upstream portion of the yarn feeding device 11.

  Here, since the core yarn 10 of the present embodiment is spun by winding the fiber bundle 8 around the elastic yarn 22 as a core yarn in a stretched state, the tension is weakened or no tension is applied at all. When not applied, the core yarn 10 contracts in the length direction and slightly expands in the radial direction. Further, the core yarn 10 contracts due to the elastic force of the elastic yarn 22 and exhibits a sharpening. In particular, in the present embodiment, the suction force of the suction pipe 44 is set to be weak as described above. Therefore, the core yarn 10 between the yarn feeding device 11 and the suction pipe 44 has completed the yarn joining by the yarn joining device 43. As compared with the case where the winding of the core yarn 10 by the winding device 12 is resumed, the radial expansion tendency and the twisting tendency appear more strongly, and the presence of the elastic yarn 22 which is the core yarn of the core yarn 10 is manifested. It will be.

  Accordingly, when the normal core yarn 10 having the elastic yarn 22 is spun by the spinning device 9, when the spun core yarn 10 passes through the slab catcher 35 between the yarn feeding device 11 and the suction pipe 44, the light receiving unit 38. As a result, the area of the shadow formed becomes larger and the output voltage of the light receiving section 38 increases. Therefore, instead of detecting the actual thickness of the core yarn 10, the radial expansion can be detected by detecting the interval between the shadow outlines as viewed from the radial direction as the outline thickness. Further, due to the above-described margin, fluctuation (variation) in the output voltage of the light receiving unit 38 increases. On the other hand, when a defective core yarn that does not contain the elastic yarn 22 is spun from the spinning device 9 for some reason, the radial expansion tendency as described above does not appear, so the area of the shadow hardly changes, and the light receiving unit 38. The output voltage of is almost not increased. In addition, since almost no blur occurs, the fluctuation of the output voltage of the light receiving unit 38 is small.

  Using this, the slab catcher controller 51 stores the voltage of the predetermined threshold value for determining the presence or absence of the core yarn in the storage unit 52 as described above, and the voltage value input from the light receiving unit 38 exceeds the threshold value. Whether or not the comparison unit 53 determines. As a result, if the voltage value is equal to or higher than the threshold value, it is determined that the core yarn 10 is normal with the elastic yarn 22, and if the voltage value is lower than the threshold value, it is determined that the core yarn is defective with no elastic yarn 22.

  When it is determined that the core yarn does not contain the elastic yarn 22, the control unit 56 of the slab catcher controller 51 sends a no core yarn detection signal to the control unit 57 on the spinning unit 2 side. On the spinning unit 2 side receiving this, the defective core yarn is immediately cut by the cutter device 36, and the return operation similar to that at the time of the yarn breakage is performed again. Alternatively, the abnormality may be notified and stopped, and the operator may remove the abnormality manually.

  In order to confirm the effect of this configuration, the inventor of the present application uses a normal core yarn containing the elastic yarn 22 and a core yarn containing only the covering fiber not containing the elastic yarn 22 (abnormal core yarn) at the time of winding (winding). The state after starting the winding of the yarn by the take-up device 12) and at the time of yarn joining (before starting the winding of the yarn by the winding device 12, before sucking the yarn end with the suction pipe 44 and tensioning the yarn weakly) In each state, an experiment was conducted in which the detector 39 of the slab catcher 35 was allowed to travel and the tendency of the output voltage value of the light receiver 38 was examined.

  FIG. 4 (A) shows the results for a core yarn having a thickness of Ne30, which was spun in a state where an elastic yarn having a thickness of 40 denier was stretched 3.1 times. The average voltage value at the time of winding was about 3.1V, while it was about 4.1V at the time of piecing.

  On the other hand, FIG. 4 (B) shows the results for a yarn having a thickness of Ne30 that is spun only with the covering fiber (without the elastic yarn) assuming an abnormal core yarn. In this case, the voltage value at the time of winding the yarn and the voltage value at the time of piecing remained almost unchanged, and the average value was about 3.1V.

  4A and 4B, it is clear that when the yarn is spliced, there is a difference of about 1V in the output voltage value between the normal core yarn with elastic yarn and the abnormal core yarn without elastic yarn. Has occurred. Therefore, if the threshold value is set to 3.6 V, for example, and stored in the storage unit 52 and used for the determination in the comparison unit 53, it can be accurately determined whether or not the elastic yarn 22 is contained in the core yarn 10. Become.

  In the present embodiment, as described above, the slab catcher 35 for determining the presence or absence of the core yarn (elastic yarn) 22 of the core yarn 10 is provided, and the spinning device 12 starts spinning the core yarn 10 after the spinning device 9 starts spinning. The core yarn 10 that has been spun is introduced into the slab catcher 35 at the time before winding of the core yarn 10 until the winding of the core yarn 10 is started, that is, at the time of yarn joining service by the yarn joining device 43, and the presence or absence of the elastic yarn 22 It is comprised so that it may determine. Therefore, the presence or absence of the core yarn of the core yarn 10 can be reliably determined with a simple configuration. The determination of the presence / absence of the core yarn is performed after the spinning device 9 starts spinning the core yarn 10 and before the winding by the winding device 12, so that the core yarn used for the determination of the presence / absence of the core yarn is used. 10 is not wound on the winding device 12.

  Further, in the present embodiment, after the spinning is started, the core yarn 10 is sucked weakly by the suction pipe 44, and the presence of the core yarn (elastic yarn) 22 is made clearer than after the winding by the winding device 12 is started. In this state, the slab catcher 35 is introduced. Therefore, the presence or absence of the elastic yarn 22 in the core yarn 10 can be accurately determined.

Moreover, in this embodiment, the core yarn of the core yarn 10 is the elastic yarn 22, and the slab catcher 35 has the core yarn (elastic yarn) 22 because the thickness of the core yarn 10 is larger than a predetermined threshold. I am trying to judge. The manifestation of the presence of the core yarn (elastic yarn) 22 is performed by reducing the tension of the core yarn 10 or loosening the core yarn 10 from the time after the start of winding.
That is, in this embodiment, since the core yarn is the elastic yarn 22 rich in stretchability, the normal core yarn 10 having this core yarn contracts and expands in the radial direction depending on the tensile force in the length direction. To do. For this reason, when the core yarn 10 is weakened or loosened after the winding start by the winding device 12 (during winding), the normal core yarn 10 having the core yarn is detected by the slab catcher 35. The thickness of the core yarn 10 tends to increase. On the other hand, in the case of an abnormal core yarn without a core yarn, the above tendency does not appear. Therefore, the presence or absence of the core yarn (elastic yarn 22) by the slab catcher 35 can be accurately determined.

  In the present embodiment, the presence or absence of the core yarn is determined before the winding device 12 starts winding. The yarn monitoring means for monitoring the defects of the core yarn 10 after the winding device 12 starts winding. As a slab catcher 35. The slab catcher 35 as the core yarn presence / absence determining means has a threshold for determining the presence / absence of the core yarn separately from the threshold for monitoring the yarn during spinning. Accordingly, the core yarn presence / absence determining means and the yarn monitoring means can be made common, and at the same time, the slab catcher 35 can accurately perform both the presence / absence of the core yarn and the yarn monitoring using different thresholds according to the purpose. it can.

  In the present embodiment, the core yarn 10 is guided to the detection unit 39 of the slab catcher 35 that detects the contour of the core yarn 10, and the thickness of the core yarn 10 detected by the detection unit 39 is larger than a predetermined threshold value. It is determined that the elastic yarn 22 is present inside the core yarn 10. Therefore, the presence or absence of the core yarn of the core yarn 10 can be reliably determined with a simple configuration.

  Although the preferred first embodiment of the present invention has been described above, the above configuration can be implemented with various modifications as shown below, for example.

  (1) In the above embodiment, when the presence or absence of the core yarn is determined, the presence or absence of the core yarn is determined based on whether or not the output voltage of the light receiving unit 38 corresponding to the size of the contour (contour thickness) exceeds a predetermined threshold. However, the slab catcher controller 51 has a function of calculating, for example, a variation (variation) in the output voltage of the light receiving unit 38, for example, a standard deviation, and the presence / absence of the core yarn is determined depending on whether the variation exceeds a predetermined threshold. Also good. Further, the presence / absence of the core yarn may be determined in combination from both the thickness of the core yarn detected by the light receiving unit 38 and its variation (variation).

  (2) The slab catcher as the yarn defect detector or the core yarn presence / absence determination device is not limited to a so-called photoelectric type, and for example, a capacitance type slab catcher can be adopted.

  (3) In the above embodiment, the core yarn presence / absence determination device is also used as a slab catcher. However, a core yarn presence / absence determination device may be provided separately from the slab catcher. However, it is desirable that the slab catcher also serves as a core yarn presence / absence determination device because the configuration is further simplified.

  Next, a preferred second embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 5 shows a spinning machine 101 for core yarn spinning provided with a large number of spinning units 102 arranged side by side. In this spinning machine 101, a yarn joining cart 103 provided so as to be able to run in the direction in which the spinning units 102 are arranged, and a doffing cart (service cart, service device) provided so as to be able to run independently of this yarn joining cart. ) 104, a blower box 180, and a prime mover box 181.

  As shown in FIG. 5, each spinning unit 102 has a draft device 107, a spinning member 109, a yarn feeding device 111, and a winding device 112 as main components. The draft device 107 is provided in the vicinity of the upper end of the casing 106 of the spinning machine 101 body, and is sent from a fiber bundle (covering fiber) 108 sent from the draft device 107 and an elastic yarn supply device 123 described later. The elastic yarn (core yarn) 122 is configured to be spun by the spinning member 109. The core yarn 110 as the spun yarn discharged from the spinning member 109 is fed downward by the yarn feeding device 111, passes through the cutter device 136 and the slab catcher (yarn defect detecting means) 135, and is then wound up by the winding device 112. The package 145 is formed.

  As shown in FIG. 6, the draft device 107 is for drawing a sliver 113 into a fiber bundle 108, and includes a middle roller 117 and a front roller 118 on which a back roller 114, a third roller 115, and an apron belt 116 are mounted. These four rollers are used.

  The yarn feeding device 111 includes a delivery roller 139 supported by the casing 106 of the spinning machine 101 main body, and a nip roller 140 provided so as to be able to contact and separate from the delivery roller 139. The core yarn 110 discharged from the spinning member 109 is sandwiched between the delivery roller 139 and the nip roller 140, and the delivery roller 139 is rotationally driven to feed the core yarn 110 to the winding device 112 side.

  As shown in FIGS. 5 and 6, the elastic yarn supply device 123 includes a rotating roller 126 for driving the elastic yarn package 125 for each spinning unit 102. The elastic yarn package 125 is rotatably supported by a cradle arm 127 that is pivotally supported, and is configured to come into contact with the peripheral surface of the rotating roller 126. The rotating roller 126 is connected to the motor 124 via the belt 128 for each spinning unit 102.

  This elastic yarn supply device 123 can stop the rotation of the rotating roller 126 by controlling the motor 124 when the elastic yarn 122 is broken, and can individually stop the rotation of the elastic yarn package 125 for each spinning unit 102. Yes.

  The elastic yarn 122 unwound from the elastic yarn package 125 passes through the air soccer device 130, a clamp cutter device (not shown), and the supply guide cylinder 131, and is supplied to a position slightly upstream of the front roller 118, and the fiber bundle 108. At the same time, it is introduced into the spinning member 109. Then, the fiber bundle 108 is wound around the outer periphery of the elastic yarn 122 by the swirling air flow generated by the spinning member 109, the core yarn 110 is spun, and is further sent downstream by the yarn feeding device 111. Note that the peripheral speed of the delivery roller 139 of the yarn feeder 111 is configured to be greater than the peripheral speed of the rotating roller 126, whereby the elastic yarn 122 is stretched to a predetermined stretch ratio (for example, 3 times). Thus, the fiber bundle 108 is wound around the spinning member 109 and spun.

  The winding device 112 is configured so that both ends in the axial direction of a bobbin (winding tube) 148 as a core of the package 145 can be rotatably held, and a driving drum 179 is brought into contact with the peripheral surface of the bobbin 148, The bobbin 148 is rotated so that the core yarn 110 can be taken up.

  As shown in FIGS. 5 and 6, the yarn joining cart 103 is provided with a carriage 142, a yarn joining device 143 such as a splicer provided on the carriage 142, and a carriage 142 that can be raised and lowered. However, the suction pipe 144 that sucks the yarn end that has been discharged from the spinning member 109 and passed through the yarn feeding device 111 and captures the yarn end and guides it to the yarn joining device 143, and the carriage 142 are provided so as to be able to be raised and lowered, and turn around the axis. However, it has a suction mouth 146 that sucks and captures the yarn end from the package 145 rotatably supported by the winding device 112 and guides it to the yarn joining device 143.

  As shown in FIG. 6, a traveling space 150 of the yarn splicing carriage 103 is formed inside the rear portion of the casing 106. The traveling space 150 is formed in an elongated shape along the direction in which the spinning units 102 are arranged. Rails 141 are disposed at the upper and lower portions of the traveling space 150, and traveling wheels 149 are provided at the lower portion of the carriage 142. With this configuration, the yarn splicing carriage 103 can travel in the traveling space 150 by driving the traveling wheels 149 while being guided in the traveling direction by the rail 141.

  A slab catcher 135 and a cutter device 136 are provided on the front side of the casing 106 of the spinning machine 101 and slightly below the yarn feeding device 111, and the detection unit of the slab catcher 135 serves as a spinning member. The core yarn 110 spun at 109 passes through before being wound by the winding device 112. The slab catcher 135 monitors the thickness of the traveling core yarn 110 and transmits a yarn defect detection signal when a fine yarn portion or a thick yarn portion (yarn defect) of the core yarn 110 is detected. Upon receiving this signal, the controller of the spinning unit 102 immediately operates the cutter device 136 to cut the core yarn 110, and temporarily stops the draft device 107, the spinning member 109, the elastic yarn supply device 123, etc. 103 is allowed to self-propel to the spinning unit 102. Thereafter, the spinning member 109 and the elastic yarn supply device 123 are re-driven to cause the yarn splicing carriage 103 to perform yarn splicing to resume spinning and winding.

  As shown in FIG. 7, the slab catcher (yarn clearer) 135 includes a light projecting unit 137 composed of a light emitting element such as an LED and a light receiving unit 138 composed of a photoelectric conversion element. The size (area) of a shadow formed on the light receiving unit 138 as a result of the light projected from the light projecting unit 137 being blocked by the core yarn 110 can be converted into a voltage signal by the light receiving unit 138. ing. In the present embodiment, a photoelectric conversion element having such a characteristic that the voltage value increases almost in proportion to the size of the shadow is used for the light receiving unit 138.

  In FIG. 7, the slab catcher controller 151 is formed of a known microcomputer, and includes a CPU (arithmetic unit), a ROM, a RAM (storage unit), and an interface (not shown). An appropriate program is stored in the storage means, and the control unit 156, the storage unit 152, the comparison unit 153, the light projection control unit 155, and the like are built in the slab catcher controller 151 by the hardware and the software. Has been.

  The storage unit 152 is mainly configured by a RAM, and is configured to be able to store a voltage value range (allowable voltage value) corresponding to a normal allowable thickness range of the core yarn 110, that is, a yarn monitoring threshold value. . The range of the allowable voltage value is determined by one or both of an upper limit threshold value and a lower limit threshold value, depending on the yarn defect to be detected. Further, the storage unit 152 is configured to be capable of storing a threshold value for determining the presence / absence of a core thread, which will be described later, in addition to the above-described threshold value for monitoring a thread. The control unit 156 controls the overall operation and performs communication with the controller on the spinning unit 102 side. A comparison unit 153 is configured inside the control unit 156, and the comparison unit 153 compares the voltage value input from the light receiving unit 138 with a threshold value for yarn monitoring.

  With this configuration, voltage signals from the light receiving unit 138 are input to the slab catcher controller 151 one after another, and the change in the thickness of the traveling core yarn 110 is monitored. That is, when the thickness (contour thickness) of the traveling core yarn 110 varies, the size of the shadow formed on the light receiving unit 138 varies, which appears as a variation in the voltage value output from the light receiving unit 138. The voltage value is digitally converted by the A / D converter 154, and then input to the comparison unit 153 to be compared with the above-described threshold value for yarn monitoring. When a yarn defect such as a thick yarn portion or a fine yarn portion exists in the core yarn 110 and the yarn defect passes through the detection unit 159, the fluctuation of the output voltage value of the light receiving unit becomes large and is determined by a threshold value for yarn monitoring. Out of range. The control unit 156 of the slab catcher controller 151 that has detected this by the comparison unit 153 sends a yarn defect signal to the control unit 157 of the controller of the spinning unit 102. When this is received, the spinning unit 102 side immediately sends a signal to the cutter device 136 to cut the core yarn 110, and a request for the yarn joining operation by the yarn joining device 143 occurs. At the same time, the spinning member 109, the elastic yarn supply device 123, the draft device 107, and the like are stopped, and the winding is interrupted. Thereafter, the control unit 157 of the spinning unit 102 causes the yarn splicing carriage 103 to self-travel to the position of the spinning unit 102. When the yarn joining carriage 103 arrives at the position of the spinning unit 102, the driving of the spinning member 109, the elastic yarn supplying device 123, etc. is resumed, and the yarn joining carriage 103 is caused to perform a predetermined yarn joining operation. The core yarn 110 and the core yarn 110 on the package 145 side are spliced.

  The driving voltage of the light projecting unit 137 can be changed by a variable voltage source 147, and the light projecting control unit 155 of the slab catcher controller 151 is connected to the variable voltage source 147. With this configuration, even if deterioration or temperature drift of the light projecting unit 137 occurs, the voltage value that the variable voltage source 147 gives to the light projecting unit 137 is changed so that the light projecting control unit 155 compensates for it. ing. As a result, stable yarn defect detection is realized.

  The doffing carriage 104 is provided independently of the yarn joining carriage 103, and as shown in FIGS. 5 and 6, along the traveling path 186 provided at the front of the spinning machine 101 main body, the spinning unit The vehicle can travel in the direction in which 102 are arranged. The traveling direction of the doffing carriage 104 is elongated along the direction in which the spinning units 102 are arranged, like the yarn splicing carriage 103. Further, the doffing carriage 104 is arranged so as to face each spinning unit 102 on the front side across the traveling path of the core yarn 110.

  As shown in FIGS. 5 and 6, the doffing carriage 104 has a carriage casing 185 that can run on the running path 186 by running wheels 187. The carriage casing 185 is provided with a suction pipe 188 as a core yarn capturing means, a chucker 189, and a bunch winding device (not shown). The suction pipe 188 is provided on the carriage casing 185 so as to be able to be lifted and retracted in order to capture the yarn end discharged from the spinning member 109 while sucking it and guide it to the winding device 112. The chucker 189 is rotatably provided on the carriage casing 185 in order to supply an empty bobbin 148 to the winding device 112.

  In addition, a guide 158 is installed in the upper part of the carriage casing 185, whereby the core yarn 110 is guided to the slab catcher 135 during the doffing operation. The detailed configuration of the guide 158 will be described later.

  A loading area 195 for the full-winding package 145 is set in front of the traveling path 186 of the doffing cart 104. On the other hand, the bogie casing 185 of the doffing bogie 104 is configured as a front view gate as shown in FIG. 5 and includes a package passage 193. As shown in FIG. 6, the package passage 193 includes an inclined floor 194 that becomes lower as the placement area 195 is approached. With this configuration, the fully wound package 145 removed by releasing the pinching of the bobbin 148 of the winding device 112 rolls over the inclined floor 194 through the package passage 193, and is placed in the mounting area 195. It falls into the shallow groove 196 formed in the bottom and stops. The full package 145 thus moved to the placement area 195 is collected by the operator and sent to the next process.

  Next, a doffing operation (doffing service) by the doffing cart 104 will be described with reference to FIG.

  When a sensor (not shown) detects that the package 145 is full in a spinning unit 102 among the plurality of spinning units 102, the controller of the spinning machine 101 detects the back roller 114 and the third roller 115 of the draft device 107. And the spinning member 109 are stopped, and the winding device 112 stops the rotational driving of the package 145. Then, a signal is sent to the doffing carriage 104 to travel to the front of the spinning unit 102. FIG. 6 shows a state where the doffing carriage 104 has traveled to the target spinning unit 102 and stopped. It is also possible to output a full-winding notice signal from the spinning unit 102 at the stage when the package is wound up to a full winding, and move the doffing carriage 104 to the corresponding unit 102 in advance and wait.

  After the doffing carriage 104 is stopped, the doffing carriage 104 releases the support state of the full-winding package 145 by appropriately operating the winding device 112 as shown in FIG. The fully wound package 145 removed from the winding device 112 passes through the package passage 193 in the doffing cart 104 so as to roll on the inclined floor 194, and falls into the groove 196 in the placement area 195 and stops.

  At substantially the same time as removing the full package 145 in this way, the doffing carriage 104 rotates the suction pipe 188 obliquely upward and extends it by a pneumatic cylinder (not shown), and its suction port is the delivery roller 139 and nip roller of the yarn feeder 111. It moves to just downstream of 140 (FIG. 8). Then, the core yarn 110 spun on the spinning member 109 side is sucked and captured.

  Further, as shown in FIG. 9, the chucker 189 sets an empty bobbin 148 that is stocked in the inside of the cart casing 185 and is not wound with a thread, to the winding device 112. Further, the suction pipe 188 in the extended state is retracted as shown in FIG. 9 and rotated downward so that the end of the yarn spun from the spinning member 109 is sucked into the vicinity of the empty bobbin 148. The bobbin 148 is guided and bunch-wound is performed on the bobbin 148 by a bunch winding device (not shown) so as to attach the yarn.

  At this time, as shown in FIG. 9, the guide 158 of the carriage casing 185 advances so as to project toward the spinning unit 102, and the core yarn 110 stretched between the yarn feeding device 111 and the suction pipe 188 is moved. The guide plate 173 at the tip of the guide guides the yarn path to pass through the detection portion of the slab catcher 135. In this state, the slab catcher 135 determines whether or not the core yarn 110 has the core yarn. This core yarn presence / absence determination method will be described later.

  Immediately after the above-described bunch winding is completed, the doffing carriage 104 brings the empty bobbin 148 into contact with the drive drum 179 and resumes the winding of the core yarn 110. The doffing operation (doffing service) is completed as described above, and the chucker 189, the suction pipe 188, and the guide 158 return to the initial positions shown in FIG. The operations of the chucker 189, the suction pipe 188, and the guide 158 described above are performed as a series of movements by driving a cam shaft (not shown) supported by the doffing carriage 104 by an electric motor (not shown). .

  Next, the determination of the presence or absence of the core yarn of the core yarn 110 by the slab catcher 135 will be described. FIG. 10 is a block diagram of a slab catcher when functioning as a core yarn presence / absence determining means, corresponding to FIG.

  That is, as described above with reference to FIGS. 6 and 7, the slab catcher 135 is provided for detecting a yarn defect when the core yarn 110 is wound by the winding device 112. It also functions as a determination device that determines whether or not the elastic yarn 122 is contained in the core yarn 110 during the doffing service. Hereinafter, this configuration will be described.

  That is, the spinning core yarn 110 sucked and captured by the suction pipe 188 at the time of the doffing service by the doffing cart 104 is drawn out for bunch winding, and the yarn path is shown in FIG. In this way, when the guide 158 of the doffing carriage 104 advances to the spinning unit 102 side, it is guided so as to pass through the detection unit of the slab catcher 135 and the cutter device 136. As a result, as shown in FIG. 10, the core yarn 110 continuously spun from the spinning member 109 is fed by the yarn feeding device 111, passes through the light projecting portion 137 of the cutter device 136 and the slab catcher 135, and then suctioned. It will be sucked into the pipe 188.

  Here, the core yarn 110 of this embodiment is spun by winding the fiber bundle 108 around the elastic yarn 122 as a core yarn in a stretched state. Contracts and expands slightly in the radial direction. Further, the core yarn 110 exhibits a sharpness due to the elastic force of the elastic yarn 122. In particular, if the suction force of the suction pipe 188 is set to be weak, the core yarn 110 that is weakly stretched between the yarn feeding device 111 and the suction pipe 188 has a stronger tendency to expand in the radial direction and tenderness. It will be.

  Therefore, when a normal core yarn 110 passes through the slab catcher 135 between the yarn feeder 111 and the suction pipe 144 at the time of doffing, the area of the shadow formed on the light receiving unit 138 increases, and the output voltage of the light receiving unit 138 is increased. Will increase. Further, due to the above-described margin, fluctuation (variation) in the output voltage of the light receiving unit 138 increases. On the other hand, when a defective core yarn that does not contain the elastic yarn 122 is spun from the spinning member 109 for some reason, the radial expansion tendency as described above does not appear. The output voltage of is almost not increased. In addition, since almost no blur occurs, the fluctuation of the output voltage of the light receiving unit 138 is small.

  By utilizing this, the slab catcher controller 151 stores the threshold voltage for core yarn presence / absence determination in the storage unit 152 in addition to the threshold for yarn monitoring, as described above, and the voltage input from the light receiving unit 138. The comparison unit 153 determines whether the value exceeds the threshold value. As a result, if the voltage value is equal to or higher than the threshold value, it is determined that the core yarn 110 is normal with the elastic yarn 122, and if the voltage value is lower than the threshold value, it is determined that the core yarn is defective with no elastic yarn 122.

  When it is determined that the core yarn does not contain the elastic yarn 122, the control unit 156 of the slab catcher controller 151 sends a no core yarn detection signal to the control unit 157 on the spinning unit 102 side. Upon receiving this, the spinning unit 102 immediately cuts the defective core yarn by the cutter device 136, notifies the abnormality and stops, and prompts the operator to remove the abnormality.

  The determination principle of the presence / absence of the core yarn is substantially the same as the determination of the presence / absence of the core yarn performed at the time of yarn joining in the first embodiment (see the experimental result of FIG. 4). Therefore, also in the second embodiment, the presence or absence of the elastic yarn 122 as the core yarn can be accurately detected.

  Next, the configuration of the guide 158 for guiding the core yarn 110 to the slab catcher 135 during the doffing will be described in detail with reference to FIG. FIG. 11 is a perspective view of the guide immediately after the doffing operation in the doffing cart is started, as viewed from the doffing cart side. FIG. 12 is a perspective view showing a state in which the guide is swung from the retracted state, protrudes toward the spinning unit, and approaches the yarn path by the yarn guide plate. FIG. 13 is a perspective view showing how the pneumatic cylinder is further extended to guide the core yarn to the slab catcher. FIG. 14 is a perspective view showing a state in which the yarn path is removed from the yarn gathering plate. FIG. 15 is a perspective view showing a state in which the yarn path guide by the guide is completed.

  As shown in FIG. 11, the guide 158 is installed on the upper surface of the carriage casing 185 of the doffing carriage 104, and includes a first arm 161 and a second arm 162 that are stacked one above the other. These two arms 161 and 162 are rotatably supported around a support shaft 167 provided upright on the upper surface of the carriage casing 185. A drive arm 160 is rotatably provided inside the carriage casing 185, and the tip of the drive arm 160 is connected to one end of the first arm 161 via a rod 168. The drive arm 160 is connected to the camshaft (not shown) for driving the suction pipe 188, the chucker 189, and the like in a linked manner.

  Each of the first arm 161 and the second arm 162 is formed by bending the tip side into a hook shape. A thread removing plate 171 is provided at the tip of the first arm 161, and a thread guide is provided at the tip of the second arm 162. Plates 172 are each attached. The support shaft 167 incorporates a biasing spring (not shown), and the biasing spring causes the second arm 162 to rotate relative to the first arm 161 in the clockwise direction in FIG. Be forced. However, the rotation is restricted by the protrusion 164 formed on the second arm 162 coming into contact with the first arm 161.

  A pneumatic cylinder 163 is installed on the upper surface of the second arm 162 located on the upper side of the two arms 161 and 162. A guide plate 173 for guiding the yarn path is fixed to the tip of the movable portion of the pneumatic cylinder 163. A guide groove 174 into which the core yarn 110 can be inserted is formed at the cylinder extension side end of the guide plate 173.

  With the above configuration, FIG. 11 shows a state where the suction pipe 188 of the doffing carriage 104 is retracted while sucking and capturing the core yarn 110. As shown in FIG. 11, the guide 158 is in a state of being retracted without protruding from the upper part of the doffing carriage 104 until the tip of the suction pipe 188 passes in front of the slab catcher 135 and descends further downward. Is maintained.

  Immediately after the tip of the suction pipe 188 passes below the slab catcher 135, the drive arm 160 is driven by a camshaft (not shown), and the drive arm 160 passes through a rod 168 as shown in FIG. Then, the first arm 161 is pulled and rotated. The second arm 162 is also rotated so as to follow the first arm 161 by an urging spring incorporated in the support shaft 167. As a result, the yarn guide plate 172 of the second arm 162 comes into contact with the core yarn 110 and slightly moves the yarn path to the right side. In this state, the yarn removing plate 171 of the first arm 161 is not in contact with the yarn path.

  In the state shown in FIG. 12, the pneumatic cylinder 163 is in a retracted state, and the above-described guide plate 173 is located slightly on the near side (the doffing cart 104 side) from the yarn path of the core yarn 110. In FIG. 12, the yarn path of the core yarn 110 and the guide groove 174 of the guide plate 173 are illustrated so as to overlap each other. However, in the state of FIG. 12, the core yarn 110 has not yet been inserted into the guide groove 174.

  When the above-described two arms 161 and 162 are turned, and the arms 161 and 162 project from the doffing carriage 104, compressed air is supplied to the pneumatic cylinder 163 and the pneumatic cylinder 163 extends. . As a result, as shown in FIG. 13, the guide plate 173 advances while the core yarn 110 is inserted into the guide groove 174 and is positioned just below the slab catcher 135 on the spinning unit 102 side. As a result, the core yarn 110 delivered from the yarn feeder 111 is guided by the guide plate 173 and the guide groove 174 so as to pass through the cutter device 136 and the slab catcher 135.

  Immediately after the above-described advancement of the guide plate 173, the driving arm 160 further rotates the first arm 161 through the rod 168. The second arm 162 also tries to rotate following the urging spring built in the support shaft 167, but the restriction projection 165 formed on the second arm 162 is fixed to the upper surface of the carriage casing 185. The contact with the stopper 166 is prevented. As a result, as shown in FIG. 14, only the first arm 161 turns slightly, and the thread removing plate 171 at the tip thereof contacts the core yarn 110, and the yarn path is further moved to the right side. The arm 162 comes off the yarn guide plate 172. The first arm 161 is returned to its original position (thread removal operation) in a short time. As a result, as shown in FIGS. 15 and 9, the core yarn 110 is guided only by the guide groove of the guide plate 173. Become. The core yarn presence / absence determination shown in FIG. 10 is performed before the first arm 161 is returned to its original state.

  The above is the guide operation of the guide 158 with respect to the core yarn 110 for determining the presence / absence of the core yarn. After the presence / absence determination of the core yarn by the slab catcher 135, the pneumatic cylinder 163 is retracted and the guide plate 173 is moved to the doffing cart 104 side. With this, the core yarn 110 is pulled out of the guide groove 174 of the guide plate 173. Then, the drive arm 160 turns the two arms 161 and 162 so as to return to the original retracted position. Thus, a series of operations of the guide 158 is completed, and the guide 158 returns to the retracted state of FIG.

  The guide to the core yarn 110 by the guide 158 is completed at a stage before the doffing operation of the doffing carriage 104 (referring to a series of operations including collection of full packages and bunch winding) is completed ( More specifically, the operation timing of each of the arms 161 and 162 and the pneumatic cylinder 163 is determined so that the bunch winding by the above-described bunch winding device is completed). That is, the presence / absence determination of the core yarn can be performed simultaneously during the doffing operation, and the working time is shortened. In particular, by setting the timing so as to end the core yarn presence / absence determination by the slab catcher 135 at the time before the bunch winding, the work time can be made almost zero. Even when it is determined by the slab catcher 135 that there is a defective core yarn having no core yarn, since it is in a state before the bunch winding, it is easy to recover from the abnormality.

  As described above, in the core yarn spinning machine 101 of the present embodiment, the slab catcher 135 as the core yarn presence / absence determining means for determining the presence / absence of the core yarn of the core yarn 110 at the time of the doffing service by the doffing cart 104, The core yarn 110 is guided. Accordingly, it is possible to perform the core yarn presence / absence determination operation in parallel during the doffing operation, and it is possible to reliably detect the absence of the core yarn of the core yarn without increasing the operation stop time of the spinning unit 102.

  Further, the guidance of the core yarn 110 to the slab catcher 135 is performed at a timing before the end of the doffing service. Therefore, it becomes easy to finish the core yarn presence / absence determination of the core yarn 110 during the doffing service time, and an increase in the winding stop time of the spinning unit 102 can be suppressed.

  More specifically, by making the determination of the presence or absence of the core yarn of the slab catcher 135 at the timing before the end of the doffing service, the increase in the winding stop time of the spinning unit 102 can be made zero. In addition, since the presence / absence determination of the core yarn is performed at the timing before the doffing service ends and the winding is resumed, even if the determination of the absence of the core yarn is made by the slab catcher 135, it is easy to recover from the abnormality. It is.

  The doffing truck 104 that performs the doffing service captures the core yarn 110 by the suction pipe 188 in the doffing service for the spinning unit 102, and the captured core yarn 110 is installed on the spinning unit 102 side. Guide to 135. That is, when the doffing truck 104 captures the core yarn 110 by the suction pipe 188 for doffing, the core yarn 110 can be easily guided to the slab catcher 135 of the spinning unit 102. Therefore, the presence or absence of the elastic yarn 122 by the slab catcher 135 can be reliably determined.

  The slab catcher 135 is provided in the spinning unit 102, and the doffing carriage 104 is disposed facing the spinning unit 102, and the core yarn 110 is guided to the slab catcher 135 on the doffing carriage 104 side. A movable guide 158 is provided. Therefore, when the guide 158 moves, the core yarn 110 can be easily guided from the doffing carriage 104 to the slab catcher 135 on the spinning unit 102 facing it.

  Furthermore, the guide 158 is configured to be retracted to the doffing cart 104 except during the doffing operation. Therefore, except when guiding the core yarn 110, the guide 158 is retracted to the doffing carriage 104 side as shown in FIGS. 11 and 8, so that the traveling core yarn 110, the spinning unit 102, and the yarn joining carriage 103 side parts. And the guide 158 are avoided, and the core yarn spinning machine 101 can be smoothly operated. This effect is exhibited particularly well when the doffing device (doffing carriage 104) is configured to travel between the plurality of spinning units 102 as in this embodiment. That is, the guide 158 is retracted when the doffing carriage 104 is traveling, so that the guide 158 is prevented from interfering with the components on the spinning unit 102 side, and the traveling of the doffing carriage 104 and the operation of each spinning unit 102 are prevented. Become smooth.

  The guide 158 is configured to capture the core yarn 110 and guide it to the slab catcher 135 by a turning operation and an extending operation of the core yarn 110 toward the yarn path. Therefore, the core yarn 110 can be accurately guided to the slab catcher 135 on the spinning unit 102 side facing the doffing carriage 104. Further, in the retracted state before turning and extending, the guide 158 can be stored in a compact space as shown in FIG. 11, and the doffing cart 104 can be easily downsized.

  Further, the core yarn presence / absence determining means also serves as a slab catcher 135 installed on the spinning unit 102 side for detecting yarn defects. Therefore, it is not necessary to provide a special device for determining the presence or absence of the core yarn, and the configuration is further simplified.

  The core yarn spinning machine 101 of this embodiment has a plurality of spinning units 102, and the doffing carriage 104 is configured to be able to travel between the plurality of spinning units 102. Accordingly, since one doffing carriage 104 can take charge of doffing services for a plurality of spinning units 102, the required number of doffing devices is reduced, the configuration is further simplified, and the manufacturing cost is reduced. Can be reduced.

  The preferred embodiment of the present invention has been described above, but the technical scope of the present invention is not limited to the above configuration, and can be implemented with the following modifications, for example.

  (1) The service in the core yarn spinning machine is not limited to the doffing service, and for example, a yarn splicing service can be considered. That is, a yarn joining cart that can run along the above-described running path 186 (that is, so as to face the spinning unit 102) may be provided, and the guide 158 may be provided on the yarn joining cart. In this case, it is preferable that the guide of the yarn path to the slab catcher 135 is performed by the guide 158 at a timing before the yarn joining service by the yarn joining cart is completed.

  (2) Although the core yarn presence / absence determining means is also used as the slab catcher 135 in the second embodiment as in the first embodiment, the slab catcher 135 is also used in the second embodiment. A core yarn presence / absence determining means may be provided separately.

  (3) In the above embodiment, the presence or absence of the core yarn is determined based on whether or not the output voltage of the light receiving unit 138 corresponding to the size of the contour (contour thickness) exceeds a predetermined threshold when determining the presence or absence of the core yarn. For example, the slab catcher controller 151 has a function of calculating a variation in the output voltage of the light receiving unit 138, for example, a standard deviation, and the presence or absence of the core yarn is determined depending on whether or not the variation exceeds a predetermined threshold value. You may judge. Further, the presence / absence of the core yarn may be determined in combination from both the thickness of the core yarn detected by the light receiving unit 138 and its fluctuation. Here, the “outline thickness” does not mean the actual thickness of the core yarn 110, but the interval between the outlines of the shadows when viewed from the radial direction.

  (4) The slab catcher as the yarn defect detector or the core yarn presence / absence determination device is not limited to the so-called photoelectric type in the second embodiment, as in the first embodiment. A type of slab catcher can be employed.

  (5) Further, the guide 158 guides the core yarn 110 by turning operation → extension operation. However, the guide 158 is not limited to this, and may be configured to guide the core yarn 110 only by simply turning operation or extending operation. it can. However, it is preferable that the turning operation and the extension operation are sequentially performed as in the above embodiment because the guide 158 at the retracted position can be accommodated in a compact space without interfering with other components.

  (6) The doffing carriage 104 is configured to be able to travel between the spinning units 102. However, the doffing apparatus is not limited thereto, and the doffing apparatus may be simply arranged so as not to move.

  (7) The present invention is not limited to the spinning machine including the spinning member having the above-described configuration, and can be applied to a spinning machine including a spinning member having another configuration.

  (8) The present invention is not limited to the determination of the presence or absence of the core yarn in the doffing operation of the doffing carriage 104, and includes the determination of the presence or absence of the core yarn in the yarn joining operation of the yarn joining carriage 103. In this case, the guide means corresponds to the suction pipe 144. That is, “service” includes both yarn splicing and doffing.

Claims (15)

In a core yarn spinning machine comprising a spinning device for spinning a core yarn and a winding device for winding the spun core yarn,
A core yarn presence / absence determining means for determining the presence / absence of the core yarn of the core yarn, at a time before winding from the start of spinning of the core yarn in the spinning device to the start of winding of the core yarn by the winding device; A core yarn spinning machine, wherein the spun core yarn is introduced into the core yarn presence / absence determining means.   The core yarn spinning machine according to claim 1, wherein when the core yarn is introduced into the core yarn presence / absence determining means, the spun core yarn is wound from the time after the winding of the core yarn by the winding device is started. The core yarn spinning machine is also characterized by the presence of core yarn.   The core yarn spinning machine according to claim 2, wherein the core yarn of the core yarn is an elastic yarn, and the core yarn presence / absence determining means has the core yarn when the thickness of the core yarn or a variation thereof is larger than a threshold value. The core yarn spinning machine is characterized in that the manifestation of the presence of the core yarn is performed by reducing the tension of the core yarn or loosening the core yarn from the time after the start of winding. .   The core yarn spinning machine according to any one of claims 1 to 3, wherein the core yarn presence / absence determining means is also a yarn monitoring means at a timing after the start of winding, and the core yarn presence / absence determining means includes a core yarn presence / absence determining means. A core yarn spinning machine characterized in that it has a threshold for yarn presence / absence determination separately from a threshold for yarn monitoring at the time after the start of winding. In the core yarn presence / absence determination method for determining the presence or absence of the core yarn inside the core yarn,
The core yarn that makes the presence of the core yarn more obvious than the normal state is guided to a detection unit that detects the thickness of the core yarn,
A core yarn core yarn presence / absence determination method, characterized in that it is determined that a core yarn is present when the thickness of the core yarn detected by the detection unit or the variation thereof is greater than a predetermined value. A core yarn presence / absence determination method for a core yarn according to claim 5,
The core yarn of the core yarn is an elastic yarn,
The manifestation of the presence of the core yarn is performed by reducing the tension of the core yarn or by loosening the core yarn as compared with a normal state.   A service method in a core yarn spinning machine, wherein the core yarn is guided to a core yarn presence / absence judging means for judging the presence / absence of a core yarn in the core yarn at the time of the service.   8. The service method according to claim 7, wherein the guide to the core yarn presence / absence determining means of the core yarn is performed at a timing before the service ends.   9. The service method according to claim 8, wherein the presence / absence determination of the core yarn by the core yarn presence / absence determining means is performed at a timing before the service ends. In a core yarn spinning machine having a unit for spinning and winding a core yarn, and a service device for providing a service to the unit,
A core yarn presence / absence determining means for determining the presence or absence of the core yarn of the core yarn;
A guide unit that captures the core yarn at the time of service to the unit and guides the captured core yarn to the core yarn presence / absence determining unit;
Core yarn spinning machine, characterized in that   11. The core yarn spinning machine according to claim 10, wherein the core yarn presence / absence determining means is provided in the unit, the service device is disposed facing the unit, and the guiding means is configured to cause the core yarn to exist in the core yarn presence / absence. A core yarn spinning machine characterized in that a movable guide for guiding to the judging means is provided on the service device side.   12. The core yarn spinning machine according to claim 11, wherein the guide is retracted to the service device side when the service is not performed.   13. The core yarn spinning machine according to claim 12, wherein the guide swirls from the retracted state and extends toward the yarn path side of the core yarn to capture the core yarn and guide it to the core yarn presence / absence determining means. Core yarn spinning machine characterized by that.   14. The core yarn spinning machine according to any one of claims 10 to 13, wherein the core yarn presence / absence judging means also serves as a yarn defect detecting means installed on the unit side. Machine. The core yarn spinning machine according to any one of claims 10 to 14, wherein a plurality of units are arranged in parallel, and the service device is configured to be able to travel between the plurality of units. A featured core yarn spinning machine.

Images