JPH0344487B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an abnormality detection device for a wire stripping machine, and in particular, it is possible to detect abnormalities in the strip due to contact between the stripping cutter and the core wire, thereby preventing the occurrence of defective products. The present invention relates to an abnormality detection device for a wire stripping machine that can prevent such problems.

[Conventional technology]

A wire stripping device is a device that can automatically and continuously remove the coating from the end of a wire that has been cut to a predetermined length, making it possible to quickly and labor-savingly manufacture and assemble connector terminals, wiring boards, etc. It is widely used in various fields for this purpose.

[Problem to be solved by the invention]

By the way, when wire stripping is performed, if the wire stripping cutter accidentally touches the core wire, the core wire may be damaged or broken, causing electrical and mechanical problems. In order to avoid such a situation, continuity tests, tensile tests, etc. have traditionally been conducted after assembly into a connector or the like. However, if only a portion of the core wire is damaged, it is very difficult to detect and inspection requires a great deal of time and effort.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and provides a wire stripping system that has a simple structure and allows checking for abnormalities at the same time as the stripping operation, thereby making it possible to reliably detect the occurrence of defective products without requiring much time and effort. The purpose is to provide an abnormality detection device for aircraft.

[Means to solve the problem]

The present invention includes a pair of cutters for wire stripping, and means for cutting the coating on the ends of the wire with the pair of cutters and then moving the wire and the cutters relative to each other to remove the coating. A portion of the cutter is grounded via a resistor circuit. This resistor circuit section is also provided with a control circuit equipped with an abnormal signal detection function. Furthermore, an electrode is provided along the wire that is in constant sliding contact with the wire, and a DC power source is provided that induces an electric charge in the core wire of the wire via this electrode. A configuration is adopted in which a changeover switch is provided to disconnect the electrode from the DC power source and ground it as necessary. This aims to achieve the above-mentioned purpose.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 8.

FIG. 1 is a schematic diagram showing a strip section for explaining the strip abnormality detection method according to the present invention. In FIG. 1, only one side is stripped to simplify the invention. This first
In the figure, the end of a wire 1 pulled out from a winding section (not shown) is inserted through a strip section 2 from left to right. A cutter part 7 is located in the center of the strip part 2.
is provided so as to be movable in a direction perpendicular to the length direction of the wire 1. Also, chucks 8 and 9 for removing the coating from the wire 1 are provided at both ends of the strip section 2 with the cut section 7 at the center.

The cutter parts 7 have the same shape and the wire 1
It is composed of a pair of strip cassettes 10 and 11 that are arranged opposite to each other with
The strip cassette 10 is composed of a holder 10A, a wire cutting cutter 10C and a stripping cutter 10D fixed to the holder 10A via a spacer 10B made of an insulating material. The cutter 10C is provided at the center of the holder 10A in a manner perpendicular to the wire 1. On the left side of this cutter 10C in FIG. 1, a cutter 10D is arranged in parallel at a predetermined interval. The tip of the cutter 10C is protruded toward the wire 1 side than the cutter 10D. Each of the cutters 10C and 10D is electrically insulated from the holder 10A.

Also, the blade shape of each cutter is shown in Figures 2 to 4.
As shown in the figure, it is formed in a semicircular shape and a V-groove shape. The other strip cassette 11 is also constructed similarly to the strip cassette 10. and,
These strip cassettes 10, 11 are urged by a cutter operating mechanism (not shown) to operate in synchronization with each other.

When cutting and stripping the wire 1, the stripping cassettes 10, 11 first move forward a predetermined distance toward the wire 1 (see the two-dot chain line B in FIG. 1). Then, the cutters 10C and 11C come into sliding contact and cut the wire 1 together with the core wire 12 (the second
The cutters 10D and 11D cut into the coating 13 at four locations around the wire 1 (see FIG. 3). On the contrary, the stripping cassettes 10, 11 are arranged to be retracted in the direction opposite to the wire 1 (see solid line A in FIG. 1) when the stripping operation is finished.

Chucks 8 and 9 connect the wire 1 to the strip section 2.
It is released when transferred to the right through the
When the positioning of the wire 1 in the left and right direction is completed, a chuck operation mechanism (not shown) operates, and the wire 1 is moved outward from each other by sandwiching both sides of the strip portion 2 as shown in FIG.
It is becoming more and more popular. When the cutter part 7 performs a cutting operation in this state, the center of the cutter part 7 is cut by the cutters 10C and 11C, so that the left and right wires 1A and 1B after cutting are cut by the chucks 8 and 11, respectively.
I'm drawn to 9. At this time, the coating 13 near the cut end
Since wire A is cut at four places around it with cutters 10D and 11D, the coating can be removed with a relatively weak force when wire 1A is pulled to the left, and at the same time cutters 10C and 11C act as stoppers. The covering 13A can be reliably pulled out from the cutter 1A.

When this stripping operation is completed, the cutter part 7
The wire returns to its original position, the chucks 8 and 9 are released, and the right wire (strip wire) 1B, whose right end was stripped last time, is stored in the parts container or used for crimping the next terminal, pre-soldering, etc. sent to the process. On the other hand, the left wire 1A
The portion is unwound from the winding section according to a feeding mechanism (not shown), penetrates the cut section 7, and is transferred to the right by a predetermined length. These cutter operating mechanism, chuck operating mechanism, and wire feeding mechanism are controlled by a control circuit 26 according to a predetermined sequence.

The strip section 2 configured as described above is equipped with a strip abnormality detection means 20. This strip abnormality detection means 20 detects that the stripping cutters 10D and 11D have cut into the sheathing 13 and then come into contact with the core wire 12 during the wire cutting operation and the sheathing removal operation of the cutter section 7 (see Fig. 4). This is to prevent the occurrence of defective strip wires.

To explain this strip abnormality detection means 20 in detail, first, an electrode 21 is provided facing the wire 1 on the entrance side. This electrode 21 is
As shown in FIG. 5, it has a partially annular cross section and is installed close to the wire 1 along its length. This electrode 21 is connected to a DC power source 23 via a changeover switch 22 controlled by a control circuit 26.

When the changeover switch 22 is switched to the current side and a potential V is applied to the electrode 21, a positive charge is induced in the electrode 21 as shown in FIG. The structure is such that a negative charge is induced on the electrode 21 side and a positive charge is induced on the opposite side by induction. vice versa,
When the changeover switch 22 is switched to the ground side, the electrode 2
The potential of 1 becomes zero, and the induced positive charge is released to ground (see FIG. 8).

On the other hand, the strip cutter 11D of the strip cassette 11 is grounded via the resistor circuit R. Therefore, when the cutter portion 7 performs a cutting operation and a subsequent sheathing operation with positive and negative charges induced in the core wire 12, the cutter 11D or the tip 10D whose tip portion slides into contact with the cutter 11D is the wire. 1, the positive charge induced on the opposite side of the core wire 12 from the electrode 21 escapes to the ground via the cutter 11D and the resistance circuit R. This current appears as a voltage change across the resistor circuit section R. A control circuit 26 is connected to both ends of the resistance circuit section R.
The voltage induced in the resistor circuit section R is then sent to the control circuit 26 as an abnormality detection signal. When the control circuit 26 inputs an abnormality detection signal during the wire stripping operation and detects that a stripping abnormality has occurred, it immediately stops the stripping operation. At this time, a warning can be issued to the worker using a lamp, buzzer, etc.

Next, the overall operation of the above embodiment will be explained. Here, it is assumed that the changeover switch 22 has been previously switched to the ground side as shown in FIG. 5 under the control of the control circuit 26.

First, the control circuit 26 moves the wire 1 to the right with the chucks 8 and 9 released, and transfers the wire 1 to the right.
When the right end portion 1B in FIG. 1 reaches a predetermined length, stop it, pinch it with chucks 8 and 9, and pull it to both sides. Next, the changeover switch 22 is switched to the power source side, and a charge distribution is generated in the core wire 12 of the wire 1 near the electrode 21 by electrostatic induction as shown in FIG. In this state, the cutter part 7 is driven and the wires 1A and 1B are
and the coating 13A (see the two-dot chain line B in FIG. 1).

When wire 1 is cut, two wires 1A,
1B is pulled by chucks 8 and 9 and moves in both directions. At this time, the coating 13A is cut in four places around the circumference with the cutters 10D and 11D.
As the wire 1A is pulled, the remaining part is also torn to pieces and pulled out from the core wire 12.

In this way, when the sheathing 13A is completely stripped without the cutters 10D and 11D touching the core wire 12 during cutting and sheathing operations, the control circuit 26 moves the cutter section 7 backward and returns it to its original position ( (see solid line A in Figure 1), release the chuck 9 and place the right wire 1B, which was previously stripped at one end, into a parts container (not shown) or send it to the next process, while releasing the chuck 8. Wire 1 on the left side with one end stripped this time
A is inserted through the cut portion 7 and transferred to the right by a predetermined length to prepare for the next cutting and stripping operation. Thereafter, by repeating the same operation, one-end strip wires of a constant length can be continuously formed.

Separately, when the stripping cutters 10D and 11D contact the core wire 12 when cutting the wire 1, positive charges among the charges induced in the core wire 12 by the electrode 21 pass through the cutters 11D and the resistor circuit R. Escape to ground (see Figure 7). A voltage is induced in the resistance circuit section R by the current flowing at this time. This detection voltage is sent to the control circuit 26 as an abnormality detection signal. The control circuit 26 that has received the abnormality detection signal first switches the changeover switch 22 to the ground side to release the charges induced in the core wire 12 and the electrode 21 to the ground (see FIG. 8), and then transfers the charges to the chucks 8 and 9. When the wire 1 is caught, the operation of the device is stopped and a warning is given to the operator using a lamp or the like. The operator can manually move the device one time at a time, discard the defective wire 1A, and then switch to automatic operation.

In the above embodiment, only the cutter 11D of the strip cassette 11 is grounded via the resistor circuit R, but the cutter 10D of the strip cassette 10 is also grounded as shown by the dotted line in FIG. In addition, they may be grounded in parallel via the resistor circuit section R. In addition, in the case of a double-ended wire stripping device as shown in FIG.
Stripping cutters 100 provided on both sides of wire cutting cutters 100C and 110C of 0
In order to check whether any of wires D, 110D, 100E, and 110E have contacted the core wire 12, electrodes 21 are placed on both the wire 1A side and the wire 1B side.
A, 21B, changeover switches 22A, 22B, and current power supplies 23A, 23B may be provided, and the changeover switches 22A, 22B may be synchronized and controlled by the control circuit 26 in the same manner as described above. Alternatively, the voltage induced in the control circuit section R may be sent to the control circuit 26 via the amplifier 24 and the waveform shaping circuit 25. Furthermore, as shown in FIG.
The 0D, 110D side and the 100E, 110E side are each independently grounded via resistance circuit parts R1, R2,
Amplifier 2 for each resistor circuit section R1, R2
4A, 24B and waveform shaping circuits 25A, 25B may be provided so as to be able to distinguish whether the stripping abnormality has occurred on the left or right side of the cutter. Further, as shown in FIG. 11, a guide roller section 27 is provided on the opposite side of the electrode 21 with the wire 1 in between, and the guide roller section 27 is gently pressed by a compression spring 28 to bring the wire 1 into close contact with the electrode 21. You can do it like this. Furthermore, the electrode 21 may have a substantially semicircular shape or may be a flat plate or the like, and other methods such as applying electrostatic dielectricity to the core wire or bringing a charged electret close to the wire may be used. Various modifications of the power supply/detection circuit, etc. can be considered. Also, when contact between the stripping cutter and the core wire is detected, each stripping cassette in the cutter part is moved back a little from the wire to release the contact.
The stripping operation may be continued as is. Further, the positions of chucks, electrodes, etc. are not limited to those shown in the drawings.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to check for abnormalities at the same time as the stripping operation with a simple configuration and with almost no power consumption. A control circuit equipped with an abnormal signal detection function is installed in the resistance circuit section, so if the cutter touches the core wire, the positive charge electrostatically induced in the core wire can be immediately grounded via the resistance circuit section. At this time, the control circuit can immediately detect and output the potential drop that occurs in the resistor circuit as an abnormal signal, and a DC power source is installed to forcefully induce an electric charge in the core part of the wire. It is possible to reliably set the ground power supply flowing through the resistor circuit section described above, and after detecting this ground current, actuating the changeover switch will ground the charge on the electrode section, resulting in a reset state.
Therefore, in the present invention, a predetermined amount of electric charge can be applied to or removed from the core wire of the wire by the action of the changeover switch and the DC power supply, and if the cutter touches the core wire during this time, the resistance circuit section is immediately removed. It is possible to provide an unprecedented abnormality detection device for a wire stripping machine in which the control circuit can detect this and output it as a predetermined abnormality signal.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a stripping section of a wire stripping device according to an embodiment of the present invention, FIGS. 2 to 4 are explanatory diagrams of the operation of a cutter section according to a part of FIG. 8 is a diagram explaining the principle of the strip abnormality detection means according to a part of FIG. 1, FIGS. 9 and 10 are schematic diagrams showing other embodiments, and FIG. 11 is a diagram showing a part of FIG. 1. It is a partial schematic diagram which shows the modification of an electrode part. 1...Wire, 7...Cut part, 10C, 10
D, 11C, 11D, 100C, 100D, 10
0E, 110C, 110D, 110E...Katsuta, 21, 21A, 21B...Electrode, 23, 23
A, 23B...DC power supply, R, R1, R2...Resistance circuit section.

Claims (1)

[Claims] 1. It has a pair of wire strip cutters,
In a wire stripping machine equipped with a means for cutting the coating at the end of the wire with the pair of cutters and then moving the wire and the cutter relatively to remove the coating, a part of the cutter is cut through the resistance circuit section. In addition to grounding, this resistance circuit section is also equipped with a control circuit equipped with an abnormal signal detection function, and is equipped with an electrode along the wire that is in constant sliding contact with the wire, and an electric charge is transferred to the core wire of the wire via this electrode. What is claimed is: 1. An abnormality detection device for a wire stripping machine, characterized in that the device is equipped with a DC power supply that induces the following: and a changeover switch that disconnects the electrode from the DC power supply and grounds it as necessary.