JPH0252364B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device that automatically detects the parallel welded portion of a twisted flat cable with a jacket, and uses the detection signal to detect the jacket on the parallel welded portion. It automatically marks the surface.

[Conventional technology]

As shown in Figure 3, the so-called twisted flat cable, which is a multi-pair flat cable with alternating twisted parts 2 and parallel fused parts 1, is widely used as a cable for information processing equipment and instrumentation. However, recently, this twisted flat cable has been provided with an aluminum shield 3 and a jacket 4.

[Problem that the invention seeks to solve]

However, in this case, it is quite difficult to distinguish between the twisted portion and the parallel fused portion from the outside of the jacket, and cutting at the parallel portion is inconvenient.

In order to eliminate this inconvenience, marks indicating the parallel welded portions may be placed on the surface of the jacket.

Conventionally, in order to identify this parallel welded part, an operator has to judge from the feel of the jacket or subtle differences in how light is reflected by the jacket, which has the drawback of requiring a large amount of man-hours.

[Means for solving problems]

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and to provide an apparatus for automatically detecting parallel welds in a jacketed twisted flat cable and marking the jacket surface.

In other words, the gist of the present invention is a sensor that converts the thickness of a cable into an electrical signal, a comparator that binarizes the electrical signal at an arbitrary level, and a transmitter that generates pulses in synchronization with the cable feed. an AND element that outputs a pulse only when the pulse of the oscillator and the pulse of the binarized thickness signal when the cable is thin are input at the same time; A jacketed twist-flat cable fused portion detection device is characterized in that it is comprised of a counter that outputs a signal when the number of pulses is continuously input.

〔Example〕

An embodiment of the detection device of the present invention will be further described with reference to the accompanying drawings.

As shown in FIG. 1, the continuously manufactured twisted flat cable with jacket 18 is first sandwiched between two rolls 11 and 19.

One of these rolls is a movable roll 11, which swings up and down due to the difference in the thickness of the cable 18, and this swing is converted into an electrical signal by a gap sensor 12.

After this signal is amplified by the amplifier 13,
The signal processing device 14 is entered.

On the other hand, a rotary encoder 10 is attached to the roll 19 on the fixed side, and as the cable 18 is fed, pulses as shown in FIG. 7 are generated.

FIG. 2 schematically shows the internal circuit of the signal processing device 14, in which the signal a from the gap sensor 12 is
first enters the comparator 20.

As shown in FIG. 4, the signal a from the gap sensor 12 has a wavy waveform 32 with a relatively high voltage level when a twisted portion is being detected, and a wavy waveform 32 when a parallel welded portion is being detected. The signal 31 has a low target voltage level and is stable.

This signal a is binarized using a threshold level set in advance by a comparator 20, and is used as signal b in FIG.

Next, this signal b is passed through the inverter 21, and as shown in Fig. 6, it is set to Hi level when a thin part of the cable 18 is detected, and becomes Low level when a thick part is detected. .

The signal c shown in FIG. 6 and the pulse signal d from the rotary encoder 10 shown in FIG.
The AND value is taken by the NAND element 22 to obtain the signal e shown in FIG. 8, which is input to the counter 24.

Figure 9 shows the count value of the counter 24. When the count value reaches the preset value, it is assumed that a parallel welded part has been detected, and the output is output as shown in Figure 10. Give signal g.

On the other hand, if the pulse signal shown in Fig. 9 is interrupted before reaching the preset value, the signal shown in Fig. 6 is
At the low level, the counter 24 is reset as shown in FIG.

The signal processed by the signal processing device 14 passes through the delay device 40 and enters the marking device 15, where a marking is applied to the jacket surface of the cable 18.

The delay device 40 is for timing the parallel welded portions detected by the roll portions 11 and 19 to be marked by the detection signal g when they pass through the marking device 15, and in this embodiment, a counter is used. I'm going there.

That is, a value corresponding to the distance between the roll parts 11, 19 to be detected and the marking device 15 is set as a preset value on the counter, and after the parallel welded part is detected, the cable 18 is fed this distance. If the cable 18 is fed at a constant speed, the delay device may be a timer.

The marking device 15 uses a thermal transfer marker, and during marking, the gripping device 16 pinches the cable 18, and the marking device 15 moves together with the cable 18.

Then, upon completion of marking, the gripping device 16
Release the cable 18 and at the same time release the cylinder 17.
This structure allows the marking device 15 to be returned to the desired position.

In this embodiment described above, a rotary encoder is used to generate the pulse signal d shown in FIG. 7 so as to be synchronized with the cable feed. However, if the cable feed speed is constant, the pulse signal d shown in FIG. It doesn't matter if it's a transmitter.

Furthermore, the detector uses a high-frequency oscillation type gap sensor to indirectly detect the cable thickness by detecting the runout of the movable roll, but it may also be an optical non-contact thickness gauge. The present invention is not to be construed as being limited by these Examples.

The device of this embodiment thus constructed automates the detection of the parallel welded portion of a twisted flat cable with a jacket, and also works in conjunction with the marking device to automatically mark the jacket surface corresponding to the parallel welded portion. can be attached to the cable, which greatly reduces the time required for the user to cut the cable.

〔Effect of the invention〕

As explained above, according to the present invention, it has become possible to automate the detection of the parallel fused portion of a twisted flat cable with a jacket, which was conventionally done manually by visual inspection and touch. Its industrial value is enormous.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing an embodiment of the detection device of the present invention, Fig. 2 is an explanatory block diagram showing an embodiment of the signal processing device, and Fig. 3 is an explanatory diagram showing an example of a twisted flat cable with a jacket. Figure, Figure 4~
FIG. 11 is an explanatory diagram showing signal waveforms flowing through each part of the signal processing device shown in FIG. 2. DESCRIPTION OF SYMBOLS 1... Parallel fused portion of cable, 2... Twisted portion of cable, 3... Aluminum shield, 4... Jacket, 10... Rotary encoder, 11... Movable roll, 12... Gap sensor, 13...
Amplifier, 14... Signal processing device, 15... Marking device, 16... Cable gripping device, 17...
Return cylinder, 18... Twisted flat cable with jacket, 19... Fixed roll, 20...
Comparator, 21... Inverter, 22...
NAND element, 23... buffer, 24... preset counter, 25... NOR element, 40...
...Signal delay device.

Claims (1)

[Claims] A sensor that converts the thickness of the cable into an electrical signal, a comparator that binarizes the electrical signal at an arbitrary level, an oscillator that generates a pulse in synchronization with the feeding of the cable, and a pulse of the oscillator. Said 2
A pulse is output only when the pulse of the converted thickness signal when the cable is thin is input at the same time.
1. A jacketed twist-flat cable fused portion detection device comprising an AND element and a counter that counts the pulses and outputs a signal when a given number of pulses are continuously input.