JPS6149214B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for detecting the remaining amount of a filament wound around a bobbin/drum (hereinafter referred to as the remaining amount).

The conventional method for detecting this type of remaining amount is to use a bobbin.
The body surface of the drum is made black, a shiny filament is wrapped around it, and a single phototube attached to the outside of the bobbin drum detects the reflected light from the filament surface.
It has been common practice to detect the time when this reflected light disappears (that is, when the filament wound around the bobbin drum is thinned and the black body surface of the bobbin drum is exposed) as a remaining amount signal.

However, with this method, if the position of the phototube is off the top of the moving bobbin drum, and as a result, the beam of light from the phototube is off the bobbin surface and projected into an empty space, Even if a sufficient amount of striatum remained, there was a problem in that it was judged as a residual amount detection signal.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for detecting the remaining amount of a bobbin/drum that can accurately and reliably detect the remaining amount of the bobbin/drum by eliminating the drawbacks of the prior art described above.

In other words, the gist of the present invention is to use as a method for detecting the remaining amount of a moving bobbin drum based on whether or not the outputs of two reflective phototubes provided on the bobbin drum overlap. It is in.

Next, an embodiment of the remaining amount detection method of the present invention will be described with reference to the accompanying drawings.

Note that A to E in Fig. 1 show the relationship between the state of the filament wound around the bobbin and the phototube, and a to e in Fig. 2 show the output wavelengths from the two reflective phototubes. It shows.

Now, in FIG. 1A, when the bobbin 3 passes in the direction of the arrow within the beam range of the two reflective phototubes 1 and 2 arranged parallel to the axial direction of the bobbin 3, the light beams from the two phototubes 1 and 2 The projected light beam is reflected by the filament 4 and is output only for the time it takes for the bobbin to pass, as shown in FIG. 2e.

In Fig. 2, PH1 is the time when only phototube 1 outputs, PH2 is the time when only phototube 2 outputs, and the shaded area is the time when only phototube 1 outputs, and PH2 is the time when only phototube 2 outputs.
2 is the time for simultaneous (that is, overlapping) output. At this time, the time that the two reflective phototubes 1 and 2 are outputting is the same, but since the installation interval is l apart from the moving direction of the bobbin 3, the output of the two phototubes is ON. , the timing of turning off is shifted by the time that the bobbin 3 passes through the interval l between the phototubes 1 and 2.

In addition, when the filament 4 wound around the bobbin 3 decreases as shown in FIG. However, since the shaded portion where the phototubes 1 and 2 simultaneously output remains, it is not yet detected as a remaining amount signal.

1c and 2c show the case where the filament 4 remains on the right half of the bobbin 3.

Figures D and E show the situation when the remaining amount of the filament 4 wound around the bobbin 3 is less than the mounting interval l between the phototubes 1 and 2, and the output of the phototubes 1 and 2 at this time is As shown in Figure 2 d and e, the two phototubes 1 and 2 do not output at the same time (shaded area).

In other words, as described above, it is determined whether there is time for the two reflective phototubes 1 and 2 to output at the same time or not, and this is digitally processed using a logic circuit. Perform processing such as stopping the machine as a detection signal.

In addition, how much remaining amount is detected can be determined by changing the installation interval l between the two phototubes 1 and 2, so that the remaining amount of the filament 4 is the maximum from the inner width of the bobbin 3 to the minimum of two phototubes. Since it is possible to adjust up to 1 when 1 and 2 are brought into close contact with each other, it is sufficient to select an appropriate value within that range.

Now, according to the method for detecting the remaining amount of the present invention carried out in this way, it is carried out by determining whether or not the outputs of two phototubes overlap. This eliminates the problem of having to detect the remaining amount.

[Brief explanation of the drawing]

FIGS. 1A to 1E are explanatory diagrams showing an example of the relationship between the bobbin remaining amount state and two phototubes according to the present invention, and FIGS.
FIG. 1e is an explanatory diagram showing an example of the bobbin remaining amount states of FIGS. 1A to 1E and the corresponding output waveforms from two phototubes. 1: phototube, 2: phototube, 3: bobbin, 4: striatum, l: installation interval of two phototubes, PH1: output waveform of phototube 1, PH2: output waveform of phototube 2.

Claims (1)

[Claims] 1 Two reflective phototubes are installed near the bobbin drum parallel to the axial direction of the bobbin drum with a distance shorter than the distance between the flanges of the bobbin drum, and these two phototubes detect the output,
This method uses a logic circuit to determine whether or not these two outputs overlap, and if there is no overlap, it is detected as a remaining amount signal.