JPH0733983U - False detection prevention device for yarn monitoring device - Google Patents

Abstract

(57) [Summary] [Object] To provide a device for preventing erroneous detection in a yarn monitoring device by preventing the yarn from falling out of the detection range of the yarn detection unit. In a yarn monitoring device 7 having an optical yarn detecting section, a yarn regulating guide 26 for preventing the yarn from jumping out of a detection range of the yarn detecting section at a lateral position of the thread passing through the yarn detecting section.
By providing 27, the erroneous detection preventing device of the yarn monitoring device is configured.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for preventing erroneous detection of a yarn monitoring device for detecting the presence or absence of a yarn on the yarn supplying bobbin side by electric means when a yarn breaks in an automatic winder or the like.

[0002]

[Prior art]

 In the automatic winder, when winding the yarns from the yarn supplying bobbin into the package, the yarns of many bobbins are wound into a single package by a predetermined amount. When the yarns on the bobbin side are exhausted, empty bobbins are discharged. Then, the actual bobbin is supplied, the yarn of the actual bobbin and the yarn on the package side are spliced by the splicing device, and the winding is restarted.

On the other hand, during winding of the bobbin yarn, yarn breakage may occur due to a partial defect of the yarn, and at the time of the yarn breakage, a yarn trap provided close to the wound yarn path is used. The bobbin-side yarn is sucked and held by the so-called suction holding means, and the yarn end and the package-side yarn end are spliced by the yarn splicing device, and the winding is restarted.

Such a yarn breakage condition is detected by a yarn monitoring device such as a yarn filler provided near the bobbin side yarn passage of the yarn trap in the yarn passage of the wound yarn, and the yarn being wound is wound. When the yarn breaks due to cutting, the yarn end is held by the yarn trap, so there is a yarn in the yarn monitoring device, so the yarn monitoring device detects the presence of the yarn and the yarn breaks due to the cutting of the yarn. Since it is detected, the bobbin is not replaced and the yarn splicing is performed only by the operation of the yarn splicing device.

On the other hand, when yarn is spliced due to all the bobbin yarn being wound up, the yarn monitoring device does not have any yarn, so the yarn monitoring device detects that the bobbin yarn has run out. By doing so, the bobbin at the winding position of the yarn is discharged, the next actual bobbin on standby is taken in, and the yarn splicing operation is performed to splice the yarn end of the actual bobbin and the yarn end of the package side. Becomes

The yarn monitoring device includes a light emitting element and a light receiving element, and the light receiving element detects light emitted from the light emitting element to the yarn and monitors the presence of the yarn. A yarn guide is provided above the yarn monitoring device, and the yarn guide guides the yarn so that it travels at an approximately intermediate position between the light emitting element and the light receiving element to ensure the detection of the yarn. .

[0007]

[Problems to be solved by the device]

 As described above, since the yarn guide is provided above the yarn monitoring device, the yarn path is stable during normal operation and proper yarn monitoring is performed, but when the yarn is cut, The thread tension may cause the thread to bounce off the thread guide, and especially in the case of a thick thread or a twin thread in which two threads are combined, the thread is prone to warp, resulting in a large thread bounce. Further, even if the yarn is guided by the yarn guide, the yarn may be out of the monitoring range of the yarn monitoring device due to the bending of the yarn.

In such a case, even though the yarn is originally being sucked by the yarn trap and the yarn is in the cutting state during winding, the yarn of the bobbin is broken due to being all wound. As a result, the bobbin still having a sufficient amount of yarn is ejected and a new bobbin is loaded, resulting in uneconomical and long working time. In addition, if the detection sensitivity of the yarn monitoring device is increased in order to detect even the yarn that has come off around the yarn monitoring device, the yarn guide provided in the yarn traveling section is detected, and the yarn is This will cause malfunctions such as output of existing signals.

Therefore, an object of the present invention is to provide a device for preventing false detection in a yarn monitoring device by preventing the yarn from coming off from the detection range of the yarn detecting section.

[0010]

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a yarn monitoring device including an optical yarn detection unit, wherein the yarn is located at a lateral position of the yarn passing through the yarn detection unit. By providing a yarn regulation guide that prevents the yarn from jumping out of the detection range of the detection unit, a false detection prevention device of the yarn monitoring device is configured.

[0011]

[Action]

 Since the present invention is configured as described above, even if the yarn traveling in the yarn monitoring device is splashed at the time of yarn breakage, in the yarn monitoring device, the detection range of the yarn detection unit is determined by the yarn regulation guide. It is prevented from diverting outside, and false detection is prevented.

[0012]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. In the automatic winder, as shown in FIG. 1, at a predetermined position on the bobbin support base 2 provided below the machine base 1, the thread 5 of the bobbin 4 inserted on the tray 3 is inserted into the thread guide 6 and the thread guide 6. The yarn is passed through the monitoring device 7, the tensor 8, the yarn path in front of the opening of the yarn trap 10 and the yarn quality monitoring device 34, and is wound into a package 12 which is rotationally driven while being pressed against the traverse drum 11.

As shown in FIGS. 2 to 4, the yarn monitoring device 7 includes a yarn detecting member 15 provided with a light emitting element 13 and a light receiving element 14 on its front surface, and an upper surface 16 thereof has a light emitting element 13 and a light receiving element. An upper thread guide plate 9 for guiding the thread is fixed to an intermediate position of 14. A guide groove 18 is formed at the tip of the upper thread guide plate 9 at the back of the thread introduction surface 17, and a guide portion 20 is formed at the back of the guide groove 18.

A lower thread guide plate 22 is fixed to the lower surface 21 of the thread detecting member 15, and a guide portion 24 is formed at the tip of the lower thread guide 22 in the back of the thread introducing surface 23. On the upper surface 25 of the lower thread guide plate 22, side guides (thread regulation guides) 26 and 27 are fixed on both sides so as to sandwich the guide section 24. The tips of the side guides 26 and 27 are bent so that they open each other. The side guides 26 and 27 are provided on the boundary line of the detection range of the yarn detection member 15. The inner surfaces of the side guides 26 and 27 are preferably black and mirror-finished.

In the automatic winder equipped with the yarn monitoring device 7, the yarn 5 of the lower bobbin 4 is guided by the guide portion 24 of the lower yarn guide plate 22 and the upper yarn guide of the yarn monitoring device 7 during a normal winding operation. The yarn travels between the guide portions 20 of the plate 9 and is wound around the upper package 12. At this time, a part of the light emitted from the light emitting element 13 hits the yarn 5 and is reflected, and the reflected light is received by the light receiving element 14, whereby the presence of the yarn is detected.

When all the yarns on the bobbin 4 are wound up and become empty during the above-described winding operation, the yarns are not detected in the yarn monitoring device 7, so the yarns are not detected and the bobbin 4 is emptied. This is detected, and the bobbin changing device (not shown) discharges the empty bobbin together with the tray 3 and conveys the waiting actual bobbin to the winding position. Next, high-pressure air is blown from below the tray 3, and the yarn end hanging in the hollow part of the bobbin is blown up from the hollow part of the tray through the hollow part of the bobbin.

This yarn is suction-held by rotating the suction nozzle 31 of the yarn splicing device 30 downward, and then rotates upward again. In addition, for the yarn end of the package 12, the suction mouth 32 of the yarn splicing device 30 is rotated upward to approach the outer periphery of the package, the package is reversed to suck and hold the yarn end, and the suction mouth is moved downward again. Rotate. As a result, the upper and lower yarn ends intersect at the yarn joining portion 33, yarn joining is performed, and then the yarn winding operation is started again.

On the other hand, when the yarn is cut by the cutter provided in the yarn quality monitoring device 34 due to a defect of the yarn during winding of the yarn, the yarn breakage occurs from the tenser 8 to the package 12. The yarn end on the bobbin 4 side after yarn breakage is sucked and held in the opening of the yarn trap 10 where suction air is constantly operating. At the time of this thread breakage, jumping due to large tension fluctuations of the thread, and warp and shrinkage of the thread occur, and the thread tries to come off from the thread detecting section in the thread monitoring device 7, but the thread is detected above and below the thread detecting section. Large movements are restricted by the thread guide plates, and lateral movements of the yarns between the upper and lower thread guide plates are restricted by the side guides 26 and 27. Therefore, the yarns are out of the detection range of the yarn detection section. It can be detected without fail.

In this way, when the yarn monitoring device detects the presence of the yarn at the time of the yarn breakage, it is detected that the yarn still exists in the bobbin 4, and the yarn is simply broken. 30 performs only the yarn splicing operation.

In the above embodiment, the lower guide plate to which the side guide is fixed is fixed to the lower surface of the thread detecting member separately from the upper guide plate. However, the side guide is fixed to the lower surface of the upper guide plate, The lower guide plate may be eliminated and the upper guide plate may be fixed to the upper surface of the yarn detecting member.

[0021]

[Effect of device]

 Since the present invention is configured and operates as described above, even if the yarn detecting unit moves due to the jumping of the yarn, the warp or shrinkage of the yarn at the time of yarn breakage, the side guide can Since the movement is restricted and the detection member does not go out of the detection range, it is possible to reliably detect the presence of the yarn on the yarn feeding bobbin side. Therefore, it is possible to prevent the bobbin from being erroneously detected as an empty one, even though it is actually a thread breakage, and to eject the bobbin that is still fully wound and replace it with a new actual bobbin. It

[Brief description of drawings]

FIG. 1 is a side view showing an overall outline of an automatic winder to which the present invention is applied.

FIG. 2 is a perspective view of an embodiment of the present invention.

FIG. 3 is a front view of the same.

FIG. 4 is a plan view of the same.

[Explanation of symbols]

 1 machine stand 2 bobbin support 3 tray 4 bobbin 5 thread 6 thread guide 7 thread monitoring device 8 tensor 9 upper thread guide plate 10 yarn trap 11 drum 12 package 13 light emitting element 14 light receiving element 15 thread detecting member 16 upper surface 17 thread introducing surface 18 guide groove 20 guide portion 21 lower surface 22 lower thread guide plate 23 thread introducing surface 24 guide portion 25 upper surface 26 side guide 27 side guide 30 yarn joining device 31 suction nozzle 32 suction mouth 33 yarn joining portion

Claims (1)

[Scope of utility model registration request] 1. A yarn monitoring device having an optical yarn detecting section, wherein a yarn regulating guide is provided at a lateral position of the yarn passing through the yarn detecting section to prevent the yarn from jumping out of a detection range of the yarn detecting section. An erroneous detection preventing device for a yarn monitoring device, which is characterized in that