JPS6033746B2 - Abnormal thread knot detection device for automatic winder - Google Patents

Description

[Detailed Description of the Invention] When a thread breakage occurs during the operation of an automatic winder, the knotter works and the thread tying operation is automatically performed. This may result in a long knot; in this case, try retying the knot,
In order to prevent abnormal knots from being wound onto the winding bobbin, it is necessary to detect abnormal knots in the running yarn.

The present invention relates to this type of abnormal yarn knot detection device for an automatic winder.

In this type of detection device, inside the running yarn thickness detector 4 consisting of a light emitter and a light receiver, the abnormal knot of the running yarn is detected as shown in the first figure, and the end yarn between the running yarn 1 and the knot and the yarn end is detected. 2 and 2 pass in a line perpendicular to the light ray a, the light receiver detects the abnormal thickness of the running yarn, but as shown in the second figure, while it is running inside the detector 4, it is in the state shown in the first figure. When the running yarn 1 and the end yarn 2 are twisted and pass parallel to the light beam, it may not be possible to detect the abnormal thickness of the running yarn.

The present invention has a running yarn thickness detector consisting of a light emitter and a light receiver, and is capable of more reliably detecting abnormal yarn knots regardless of the state in which the running yarn passes through the detector. The purpose of this device is to provide a device for detecting abnormal yarn knots in an automatic winder, which includes a running yarn thickness detector consisting of a light emitter and a light receiver, and a device connected to the detector that detects whether the running yarn is thicker than a standard. A comparator that continues to output a signal for a long time, and a comparator that responds when the signal starts to be input to indicate a normal thread knot.
A re-trigger monostable multi-piper that generates a signal of a predetermined time length that allows the determination of an abnormal thread knot; The present invention is characterized by comprising a gate circuit which outputs an abnormal yarn knot detection signal when both the downward pulse and the output signal of the pre-comparator are input.

Embodiments of the present invention will be described below with reference to the drawings.

In the block diagram of the present invention shown in FIG. 3, a running yarn thickness detector 4' through which a running yarn 1 having an abnormal knot 3 passes, a light projector 4-1 facing across the running yarn 1, and a phototransistor, for example. and a light receiver 4-2. This detector 4 was connected via an amplifier 5 to a comparator 6. This comparator 6 is connected to an adjustable power supply 7 for setting the reference thread thickness.
outputs a level "1" signal when a signal corresponding to the abnormal thickness of the running yarn is input, and is connected to a re-trigger monostable multipipulator 9 via a differentiator 8. The operating time T of this retrigger monostable multipipulator 9 is:
Set the length so that you can distinguish between normal and abnormal thread knots. Specifically, the time required for the winder to run completely in about 1 minute is from twice the time it takes for a normal thread knot to pass through the detector 4, and in practice it is 5 times the time it takes for a normal thread knot to pass through the detector 4.
Set to ~10x. The differentiator Q detects the end of the operation of the re-trigger monostable multi/distributor 9, and the inverter 1 connected to its output converts the phase of the output of the differentiator 0. Furthermore, when the output of the inverter, that is, the signal indicating the end of the operation of the monostable multipipulator 9, and the output signal of the comparator 6 are inputted, the AND gate 12 outputs a signal of level "1" and indicates that the abnormal thread is tied. A detection signal is supplied to a cutter 4 connected to the AND gate 12 via an amplifier 3. With the above configuration, when a thread turtle with a normal knot force 5 passes through the detector 4, the fourth
As shown in the figure, comparator 6 receives a signal with a thickness greater than the standard during its passing period, so it outputs a signal of level ``1'' (Figure 4B), and the rising edge obtained from the differentiator day is The retrigger monostable multipipelator 9 is operated by the pulse (FIG. 4C) (FIG. 4D).

AND gate turtle 2 is ~ The comparator 6 is level “1”
While outputting a signal, the signal is input to one input terminal, but the other input terminal is a pulse (the phase-converted pulse (Fig. 4E) of the monostable multipipeline signal) 4F) is in the opposite phase to the comparator 6, so no signal is input, and even in the subsequent period, when the falling pulse (FIG. 4F) is input to one input terminal, the other input state is Since the signal of the output level "1" of the comparator 6 is not input, the AND gate a2 does not output a signal (FIG. 4G).
Therefore, the cutter i4 does not cut the running yarn 1. 4. E' is the output signal of the differentiator 10. When the thread 1 having the abnormal knot 3 passes through the detector 4,
The comparator 6 outputs a signal of level "1" (FIG. 5B) during its passing period, and is retriggered by the differential pulse of the rising signal (FIG. 5C). (Fig. 5D) and its falling differential pulse (Fig. 5E)
, F) is applied to the other input terminal of the AND gate 12.
Incidentally, FIG. 5E shows the output signal of the differentiator. Then AND
One input terminal of gate turtle 2 is connected to the level of comparator 6.
1" is input, the falling differential pulse (FIG. 5F) is output from the AND gate 12 (FIG. 5G) as an abnormal yarn knot detection signal, and the output is the amplifier quantity 3.
The signal is amplified and applied to cutter 4, which activates it.
The cutter 4 thus cuts the running yarn 1, and the knotter performs the yarn tying operation again. Further, an example of an effective operation of the object of the present invention will be explained with reference to FIGS. 6 and 7. Abnormal knot 3
When passing through the detector 4, when the running yarn holder and the end yarn 2 are in the state shown in FIG. If the output signal of the detector 4 is temporarily interrupted due to (TB in Fig. 6),
The operating time T of the monostable multipipulator 9 ((Fig. 6D
) Even if the falling pulse (Fig. 6 F) of the retrigger monostable multi-noise brake 9 is input at the end of retriggering, the output signal of the comparator 6 (Fig. 6 B) is interrupted at the other input terminals. During the period (TB in FIG. 6), the falling pulse (E, F in FIG. 6) is not outputted from the AND gate 12 as an abnormal yarn knot detection signal, so the cutter 14 is not operated by its output. , the comparator 61 output (TB2 in FIG. 6) is generated again by the output signal of the detector 4. The monostable multipipulator 9 operates with a differential pulse (C in FIG. 6), and after a time T, a falling pulse is generated. When this occurs, the comparator 6 outputs a bell "1".
Since it outputs a signal of "falling pulse (Fig. 6 F)"
passes through the AND gate 12 as an abnormal yarn knot detection signal and operates the cutter 4.

When the abnormal knot 3 passes through the detector 4, as shown in FIG. When they overlap, the operation of the monostable multipipulator 9 continues for an additional time T from the time when the rising pulse of the output signal of level "1" of the comparator 6 (FIG. 7C) occurs again, so that the The falling pulse (FIG. 7F) passes through the AND gate 12 and operates the cutter 14. As described above, according to the present invention, a re-trigger monostable multipielator is connected to a running yarn thickness detector consisting of a light emitter and a light receiver via a comparator, and the falling pulse thereof and the output signal of the comparator are connected. Since a gate circuit for outputting an abnormal thread knot signal is provided, the abnormal knot can be detected more reliably no matter how it is driven to pass through the thickness detector consisting of a light projector and a light receiver.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams showing the relationship between the yarn and its thickness detector when running yarns with abnormal knots pass through the thickness detector in different states, respectively, and Figure 3 is an explanatory diagram showing the relationship between the yarn and its thickness detector, respectively. A block diagram of an embodiment of the invention, FIGS. 4 to 7 are diagrams for explaining the operation of the present invention, and FIG. Figures 5A to 7A are views of running yarns with abnormal knots as seen from the light receiver, and B, C, D, E, F, and G in Figures 4 to 7 are the respective parts of the circuit shown in the third diagram. The waveform diagram is shown. 1... Running thread, 2... End thread, 3... Abnormal knot, 4... Thickness detector, 4--, 4-2...
...the emitter, the receiver, 6...the comparator,
9...Retrigger monostable multipipulator, 1
2...AND gate. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] 1. A running yarn thickness detector consisting of a light emitter and a light receiver;
A comparator that is connected to the detector and continues to output a signal while the running yarn is thicker than the standard, and a comparator that responds when the signal starts to be input and has a length that can determine whether the yarn is a normal knot or an abnormal yarn knot. a retrigger monostable multivibrator that generates a signal for a predetermined time set as , and when the falling pulse generated when the signal of the retrigger monostable multivibrator disappears and the output signal of the comparator are both input, An abnormal yarn knot detection device for an automatic winder, comprising a gate circuit that outputs an abnormal yarn knot detector signal.