JP3314626B2 - Wire removal part detection device with self-diagnosis function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire removal portion detecting device with a self-diagnosis function.

[0002]

2. Description of the Related Art Generally, when a large amount of long insulated wire is consumed, the insulated wire wound in a reel shape (hereinafter referred to as "covered wire reel") is fed out to a predetermined feed path, and the coated wire is wound. The coated wire is continuously supplied by connecting a payout end of a new coated wire reel to the final end of the wire reel.

Incidentally, for example, Japanese Patent Application Laid-Open No. 6-26734.
As disclosed in Japanese Patent Publication No. 6 (1994), in an apparatus for processing a covered electric wire, in order to ensure product quality,
The above-described joint between the covered electric wires, the damaged portion generated in the covering of the covered electric wires, or the portion connecting the covered electric wires with a conductive tape or the like (hereinafter, collectively referred to as “wire removing portion”) ) Is detected to remove the wire removal portion. Conventionally, in order to detect such an electric wire removal portion, for example,
Japanese Laid-Open Patent Publication No. -5420 and Japanese Unexamined Patent Publication No. Hei 7-14444 have proposed an electric wire removal portion detecting device.

[0004] In the conventional wire-removed-portion detecting device, a pair of conductive rollers for elastically holding the fed coated wire in a rolling contact state is provided, and a voltage is applied to both conductive rollers. When the removed portion passes between the conductive rollers, the conductive rollers are electrically short-circuited to generate a detection signal. By the way, since the conductive roller is in rolling contact with the coated electric wire,
It always rotates when the coated electric wire is fed. Conventionally, in order to apply a voltage to such a conductive roller, an energizing brush is brought into sliding contact with the conductive roller.

[0005]

In the prior art described above, even if a disconnection or a contact failure occurs in the detection circuit, it is difficult to find such a failure, which causes a malfunction. I was In particular, when damage occurred in the portion where the conductive roller and the brush for energization are in sliding contact, this could not be detected even when the seam passed between both conductive rollers.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a self-diagnostic function wire removing portion capable of self-diagnosing a disconnection or a contact failure in a detection circuit and thereby preventing a detection failure before it occurs. It is an object to provide a detection device.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a pair of conductive rollers which elastically hold a fed coated electric wire and which can be short-circuited to each other by a wire removing portion of the coated electric wire. A detection circuit having both conductive rollers as open contacts, a power supply device capable of applying a voltage to both conductive rollers, and electrically detecting a wire-removed portion of a covered wire passing through both conductive rollers. An electric wire elimination part detection device comprising a detection unit, wherein a monitoring circuit capable of monitoring the opening of a conduction portion of the detection circuit is provided on each of an application side and a ground side of the detection circuit, with a self-diagnosis function. It is an electric wire removal part detection device.

In the invention including the specific matter, the monitoring circuit monitors whether or not the conduction portion of the detection circuit is opened. Further, in a preferred aspect, each monitoring circuit has a branch contact connected to a corresponding one of the application side and the ground side of the detection circuit, and a conductive contact on one of the application side and the ground side corresponding to the branch contact. A closed circuit including a roller and a contact that contacts the roller, and voltages E1 and E2 applied to each closed circuit.
And the voltage E applied to the detection circuit are set as E>E1> 0 E>E2> 0.

According to the invention including the specific matter, the detection circuit can be monitored by a simple closed circuit. In particular,
By setting the voltages E1 and E2 to be smaller than the voltage E of the detection circuit, a range in which the contact resistance in the detection circuit is smaller than a limit of a value allowed (scheduled) by the voltage E becomes a threshold value for the defect determination. Therefore, the detection of the contact failure becomes more reliable.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
A preferred embodiment of the present invention will be described. FIG.
1 is a circuit configuration diagram of an electric wire removal portion detection device 10 according to an embodiment of the present invention. Referring to FIG. 1, the electric wire removal portion detecting device 10 in the illustrated specific example includes a pair of conductive rollers 11 and 12. Each conductive roller 1
1 and 12 form a nip N for sandwiching the insulated wire W with each other, and by elastically rolling contact with the insulated wire W passing through the nip N, a seam W1 of the insulated wire W is formed in the same manner as in the known configuration. Can be short-circuited to each other.

Each of the conductive rollers 11 and 12 constitutes an open contact of the detection circuit 13 of the electric wire removal portion detection device 10. The detection circuit 13 includes, for example, a power supply device 14 for applying a DC voltage of 12 V, an energizing brush 15 for connecting an application side of the power supply device 14 to one conductive roller 11, and a grounding side of the power supply device 14 for the other. By connecting the conducting brush 16 connected to the conductive roller 12 with the wiring 17,
Has been embodied. Further, between the power supply device 14 of the wiring 17 constituting the detection circuit 13 and the energizing brush 15 on the application side, whether or not a current is flowing through the detection circuit 13 is determined.
That is, a detection unit 18 for detecting whether or not each of the conductive rollers 11 and 12 is short-circuited is inserted. When both the conductive rollers 11 and 12 are short-circuited similarly to a known configuration, this is detected. The detection unit 18 is configured to be able to detect.

In the above configuration, in the illustrated specific example,
An application-side branch point P1 is formed between the detection unit 18 and the application-side energizing brush 15, and a ground branching point P2 is provided between the power supply device 14 and the ground-side energization brush 16. Is formed. Branch wirings 21 and 22 are connected from the branch points P1 and P2, respectively, and are connected to the corresponding conductive rollers 11 and 12 via energizing brushes 23 and 24 provided at the respective ends. I have. As a result, the detection circuit 13 is connected to the corresponding conductive roller 11 (12) and
A pair of closed circuits 25 and 26 including an energizing brush 15 (16) as a contact point of the detection circuit 13 corresponding to 1 (12) is formed. Power supplies 27, 28 capable of applying a DC voltage of, for example, 5 V are applied to the respective branch wirings 21, 22.
Monitoring units 29 and 3 for monitoring the energized state of the closed circuit
0 are respectively connected.

In the embodiment shown, each closed circuit 25, 2
6, the voltage E1, which is applied by the power supply devices 27 and 28,
E2 is, for example, E = + 12V and E1 = E so that E>E1> 0 E>E2> 0 with respect to the voltage E applied by the power supply device 14 of the detection circuit 13.
2 = + 5V is set. Thus, the voltage E1,
By setting E2 to be smaller than the voltage E of the detection circuit 13, a value lower than the limit of the value of the contact resistance in the detection circuit 13 allowed (scheduled) by the voltage E is set as the threshold value for the defect determination. become.

In the configuration described above, when the detection circuit 13 detects a short circuit between the conductive rollers 11 and 12,
The energizing brushes 15, 16 are provided by the respective closed circuits 25, 26.
And the detection circuit 1 constituting the closed circuits 25 and 26
3 can be monitored. As a result,
If a disconnection or a contact failure occurs in the detection circuit 13, at least one of the closed circuits 25 and 26 is opened, whereby the self-diagnosis of the detection circuit 13 can be performed. Further, even when the branch wires 21 and 22 themselves have a disconnection or a contact failure, the closed circuits 25 and 26 are opened.
By detecting this with the monitoring units 29 and 30,
A defective state can be immediately detected.

As described above, in the above-described embodiment, even when the disconnection or the contact failure occurs in the detection circuit 13, such a failure can be easily and reliably found.
There is a remarkable effect that the detection failure caused by the disconnection or the contact failure in 3 can be prevented beforehand. In particular, in the illustrated example, the detection circuit 13 is a simple DC circuit.
Can be monitored, the cost can be reduced, and the failure can be detected using a threshold value smaller than the contact resistance allowed (planned) by the set voltage of the detection circuit 13 as a threshold value. Therefore, there is an advantage that defect detection becomes more reliable.

The above embodiment is merely an example of a preferred specific example of the present invention, and the present invention is not limited to the above embodiment. It goes without saying that various design changes are possible within the scope of the claims of the present invention.

[0017]

As described above, according to the present invention,
Even when a disconnection or a contact failure occurs in the detection circuit, it is easy and reliable to find such a failure. As a result, it is possible to prevent a detection failure due to a disconnection or a contact failure in the detection circuit. Has a remarkable effect.

In particular, according to the second aspect of the present invention, the detection circuit can be monitored by a simple closed circuit.
The cost can be reduced, and the failure detection can be performed with a threshold value smaller than the contact resistance allowed (planned) by the set voltage of the detection circuit, so that the failure detection is more reliable. There are advantages.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of an electric wire removal portion detection device according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Electric wire removal part detection apparatus 11 Conductive roller 12 Conductive roller 13 Detection circuit 15 Electricity brush 16 Electricity brush 25 Closed circuit (monitoring circuit) 26 Closed circuit (monitoring circuit) P1 Application branch point P2 Grounding branch point W Insulated wire W1 seam

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01B 13/00-13/012 G01R 31/02-31/06

Claims (2)

(57) [Claims] 1. A pair of conductive rollers which elastically clamp a fed coated electric wire and can be short-circuited to each other by a wire removing portion of the coated electric wire, and a detection circuit having both conductive rollers as open contacts. An electric wire removal portion detection device comprising: a power supply device capable of applying a voltage to both conductive rollers; and a detection unit for electrically detecting a wire removal portion of a covered electric wire passing through both conductive rollers. An electric wire removal portion detection device with a self-diagnosis function, wherein a monitoring circuit capable of monitoring the opening of a conductive portion of the circuit is provided on each of an application side and a ground side of the detection circuit. 2. The electric wire removal part detecting device with a self-diagnosis function according to claim 1, wherein each of the monitoring circuits includes a branch contact connected to a corresponding one of an application side and a ground side of the detection circuit, and a branch contact. Corresponding to the
A closed circuit including a contact point that comes into contact with any one of the conductive roller on the application side and the ground side, and a relationship between voltages E1 and E2 applied to each closed circuit and a voltage E applied to the detection circuit. E>E1> 0 E>E2> 0 An electric wire removal part detection device with a self-diagnosis function that is set.