JPH02257382A - Feather measuring instrument - Google Patents

Abstract

PURPOSE:To cancel and remove the variance of the quantity of external light to improve the reliability of feather measurement by adding the signal where a high frequency component corresponding to feather is removed of a feather detection signal and the signal which has the opposite polarity and includes the high frequency component. CONSTITUTION:The high frequency component is removed by a low pass filter, which removes the high frequency component corresponding to feather of the feather detection signal, and an inverter 10, which inverts the input signal, to generate a first signal and a second signal which has the polarity opposite to that of the first signal and includes the high frequency component. These first and second signals are added by an adder 11, and the signal obtained by this addition is inputted to a counter 8. First and second signals are added to cancel the variances due to external light included in first and second signals, and only the high frequency component corresponding to feather is taken out and is counted.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is advantageous for a device for measuring fluff of spun yarn, especially a small and lightweight portable type, and is capable of measuring fluff reliably regardless of changes in illuminance at the measuring location. This invention relates to a fluff measuring device that allows measurement.

[Conventional technology]

The fluff measuring device for spun yarn regulates the traveling path of the yarn, irradiates light onto the fluffed portion of the yarn as it travels, magnifies the shadow of the fluff with a lens, and then enters a light receiver to measure the amount of incident light due to the shadow of the fluff. It detects the fluctuation of
It is described in the publication No. 6-22182.

The device described in the above publication, as schematically shown in FIG.
A projector (1) that projects a shadow light image of the fluff of the running yarn (2)
, a slit plate for projecting the fluff (3) of the thread (2) (
4), an optical lens (5) that prevents the diffusion of the shadow light image of the fluff (3), a light receiver (6) provided in the focal region of this optical lens (5), and fluff detection from this light receiver (6). It consists of an amplifier (7) that amplifies the signal and a counter (8) that counts the number of voltage fluctuations corresponding to the fluff output from the amplifier (7). The number of shadows is counted and displayed as the number of fuzz on the thread.

However, as mentioned above, such a fluff measuring device is structured so that the number of changes in the amount of received light is measured as the fluff count each time the shadow of the yarn fluff passes in front of the light receiver. If the fluctuations in the environmental illuminance at the installation location are small, no measurement errors will occur, but if the illuminance at the measurement location changes, the amount of light incident on the receiver will fluctuate.
Reliability of measured values decreases.

This inconvenience is solved as described in Japanese Patent Publication No. 56-26313, in which the light is applied to the emitter according to the amount of light received so that the amount of light that enters the receiver after receiving the output of the receiver becomes a predetermined constant amount. Circuit that controls voltage (dimmer)
This can be improved by providing .

(Problem to be Solved by the Invention 1) However, even in a fluff measuring device equipped with such a light control device, in addition to the light from the projector, the light receiver receives other light (external light) at the location where the measuring device is installed. If the amount of external light increases, the voltage applied to the floodlight will drop significantly, and the amount of light from the floodlight will decrease significantly, and in extreme cases, the light will no longer be emitted from the floodlight, causing fluff to form. There was a problem in that it became impossible to detect, or if not impossible, the reliability was greatly reduced.

The present invention has been made to solve such problems, and is capable of performing reliable fluff measurement without changing the voltage applied to the projector even when the amount of external light changes. The purpose is to provide a measuring device.

[Means for solving the problem] In order to achieve the above object, the fluff measuring device of the present invention has the following features:
A low-pass filter that removes high frequency components corresponding to fluff in the fluff detection signal and an inverter that inverts the input signal are used to remove the high frequency components. and a second signal containing the high frequency component, the first signal and the second signal are added by an adder, and the signal obtained by this addition is input to a counter. It is something.

[Operation] In the fuzz measuring device configured as described above, by adding the first signal and the second signal, the external light contained in the first signal and the second signal is The fluctuations caused by the fluff are canceled out, and only the high frequency component corresponding to the fluff is extracted and sent to the counter.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

Fig. 1 is a diagram schematically showing a fuzz measuring device according to an embodiment of the present invention, Fig. 2 shows the main part of the embodiment of Fig. 1, and Fig. 2 (a) shows the configuration of this main part. , Figure 2 (b) is the second
Figure 3 shows the waveform of the output signal of each component in Figure (A).
This figure is a diagram showing a specific example of the circuit shown in FIG. 2(A), and the same parts as those in the conventional circuit are given the same reference numerals and the explanation thereof will be omitted.

In the figure, (9) is a low-pass filter, (10) is an inverter, and (11) is an adder, both of which are connected to a photoreceiver (6) (consisting of a phototransistor in the illustrated embodiment). It is connected between the counter (8) and the counter (8).

The low-pass filter (9) is connected to the output of the light receiver (6), and is used to remove high frequency components corresponding to fluff in the output voltage (fuzz detection signal) of the light receiver (6). (10) inverts the input signal (in this embodiment, the output voltage of the light receiver (6)) and outputs the inverted signal. The low-pass filter (9) and the inverter (10) are connected in parallel between the light receiver (6) and the adder (11).

Next, the operation will be explained.

The waveform of the output voltage of the photoreceiver (6) is shown in Figure 2 (b) (Vt
), this output voltage (vl) enters a low-pass filter (9), high frequency components corresponding to fluff (3) are removed and output as a first signal (2). The output voltage (V, ) of the photoreceiver (6) further enters an inverter (10), and from this inverter (10), the high frequency component is included as is, but the polarity is changed with respect to the first signal (v2). A second signal (V, ) which is inverted is output. These first signal (V, ) and second signal (v3) are sent to the adder (
11), only the high frequency component, ie, the signal (v4) corresponding to the fluff (3), is output from the adder (11), and is input to the counter (8) and counted.

In this way, the first signal (v2) and the second signal (V, )
Since the polarities are opposite to each other, even if the output voltage (V, ) of the receiver (6) fluctuates due to fluctuations in the amount of external light (this fluctuation is best seen as a fluctuation in the first signal (VZ)). ), this variation is canceled out in the adder (11). Moreover, the first signal (V,) has the high frequency component corresponding to the fluff (3) removed, whereas the second signal (V,)
Since the first signal (v3) contains such high frequency components, the first signal (v
Even if 2) and the second signal (V, ) are added, such high frequency components remain without disappearing.

4 and 5 show other embodiments of the present invention, and FIG.
The figures are similar to FIG. 2 of the previous embodiment, and FIG. 5 is similar to FIG. 3. This embodiment differs from the embodiments shown in FIGS. 1 to 3 in that it includes a low-pass filter (9) and an inverter (10).
are connected in series between the light receiver (6) and the adder (11), and the output of the light receiver (6) is connected to the series connection body of the low-pass filter (9) and the inverter (10). in parallel with the adder (
11), and in this example, it is the point connected to the light receiver (6
The signal (V,) obtained by inverting the signal (VZ) from which high frequency components in the output voltage (V, ) of The output voltage (Vl) of the optical receiver (6) directly constitutes a second signal (which has the opposite polarity to the first signal and includes a high frequency component), and these first and second signals is an adder (
11). Also in this embodiment, the first signal and the second signal have opposite polarities, and only the second signal contains a high frequency component corresponding to the fluff (3), so the adder (1
The addition in step 1) cancels out the influence of fluctuations in the amount of external light, while extracting only the signal corresponding to the fluff (3), which is similar to the embodiments shown in FIGS. 1 to 3.

Still other embodiments of the present invention are shown in FIGS. 6 and 7, and FIG. 6 is similar to FIGS. 2 and 4 in the previous embodiment.
and FIG. 7 is a view similar to FIGS. 3 and 5. This embodiment differs from the embodiments shown in FIGS. 4 and 5 only in that the low-pass filter (9) and the inverter (1o) are moved forward and backward relative to each other. This embodiment is similar to the embodiments shown in FIGS. and 5, and its operation is also similar.

Note that in both the embodiments of FIGS. 4 and 5 and the embodiments of FIGS. 6 and 7, the polarity of the output of the adder (11) is negative, but if this is inconvenient, the adder ( 11
) with an inverting function, or use an adder (11
) and the counter (8) or at an appropriate location such as at the output of the light receiver (6), an inverter similar to (10) may be provided. Also, connect an amplifier as necessary.

[Effect of the Invention J Since the present invention is configured as described above, fluctuations in the amount of external light are canceled out by addition in the adder without changing the voltage applied to the projector. Even if the number increases, the amount of light from the projector does not decrease, and the reliability of fluff measurement can be improved.

[Brief explanation of drawings]

FIG. 1 is a diagram schematically showing a fuzz measuring device according to an embodiment of the present invention, FIG. 2 is a diagram showing the main part of the embodiment of FIG. 1, and FIG. The configuration of the main parts is shown in Figure 2 (B), which shows the waveform of the output signal of each component in Figure 2 (A), and Figure 3 shows a specific example of the circuit in Figure 2 (A). , FIG. 4 and FIG. 5 are views showing other embodiments of the present invention, in which FIG. 4 is similar to FIG. 2, FIG. 5 is similar to FIG. 3, and FIG. and FIG. 7 are diagrams showing still other embodiments of the present invention, in which FIG. 6 is similar to FIGS. 2 and 4, and FIG. 7 is similar to FIGS. 3 and 5. figure,
FIG. 8 is a diagram schematically showing a conventional fuzz measuring device. In the figure, (1) is the emitter, (2) is the thread, (3) is the fluff, (6) is the receiver, (8) is the counter, (9) is the low-pass filter, (lO) is the inverter, ( 11) is an adder, and the same reference numerals in the figure indicate the same or corresponding parts.

Claims (3)

[Claims] (1) A light projector that projects light onto the fluff portion of the running yarn, a light receiver that receives the light that has passed through the fluff portion and generates a fluff detection signal corresponding to the amount of light, and a signal that corresponds to the fluff of the fluff detection signal. A fluff measuring device equipped with a counter for counting the number of fluctuations, comprising: a low-pass filter connected between the light receiver and the counter to remove high frequency components corresponding to fluff in the fluff detection signal; and an input signal. a first signal from which the high-frequency component has been removed by the low-pass filter and the inverter; and a second signal having the opposite polarity to the first signal and containing the high-frequency component. 1. A fluff measuring device, further comprising an adder for adding the first signal and the second signal, and an output of the adder is connected to the counter. (2) A low-pass filter and an inverter are connected in series between a light receiver and an adder, and the output of the light receiver is connected in parallel to the series connection of the low-pass filter and the inverter; The fluff measuring device according to claim 1, wherein the fluff measuring device is connected to the adder. (3) The fluff measuring device according to claim 1, characterized in that a low-pass filter and an inverter are connected in parallel between the light receiver and the adder.