JP2000354315A - Method for detecting cut depth by cutting blade into covered wire and coat peeling device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make coat peeling work executable with an appropriate cutting depth by detecting the distance between a cutting blade and the core or a covered wire, at the time of making the cutting blade to cut deep into the coat of the covered wire. SOLUTION: A cutting blade 30 and a conductor tube 20 are formed as a pair of electrodes and a detecting circuit 34 which detects the capacitance between the electrodes 30 and 20 is connected to the cutting blade 30. Namely, the difference of capacitance between the conductor tube 20 and cutting blade 30 is obtained when a prescribed current is made to flow to the cutting blade 30 on the receiving side by providing an input-stage buffer amplifier circuit 31 for the current, a video amplifier circuit 32, a detection circuit 33, etc., as the detecting circuit 34. The displacement is compared with a threshold set in a microcomputer or electric circuit, and the distance between the blade 30 and the core of the conductor tube 20 is continuously monitored based on the result of the comparison. Therefore, coat peeling can be executed with an appropriate cut depth.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a depth of cut when a sheath of a covered electric wire is cut for peeling or other purposes, and a peeling device for a covered electric wire using the detecting method.

[0002]

2. Description of the Related Art Insulated wires are often cut out and prepared in advance for use in various types of electrical equipment.
The ends of the cut wire are often peeled off for connection.

[0003] There are various methods of peeling. For example, the end of the covered electric wire is cut with a cutting blade, and the cut end is torn off by pulling the covered electric wire in the cut state. There is a method in which the core wire is pulled out from the core wire by a blade and peeled, and a peeling device that realizes such a method is incorporated in a sheathed wire cutting device.

[0004] In such a peeling apparatus, the cutting depth is set in advance in accordance with the thickness of the core wire of the covered wire to be covered,
Since it is configured to cut to the set depth and stop, the peeling can be performed without damaging the core wire.

[0005] For example, the cutting blade is driven by a pulse motor, and by sending a predetermined number of pulses, the cutting blade can be controlled to cut to a desired depth and stop. The initial setting of the cutting depth is based on knowing the cutting depth of each target insulated wire empirically, inputting the depth to the coating device, etc., and conducting a test based on the depth based on this instruction. Peel and visually check that there is no contact damage of the cutting blade on the core wire. If there is a contact flaw in the core wire, the depth of cut is corrected by inputting a correction input of the depth of cut.

[0006]

[0005] Such a setting is troublesome, and depends on experience and visual recognition, so it is easy to make mistakes.
There is a problem that peeling work is performed at an inappropriate cutting depth.

[0007] Even with a single coated electric wire, the thickness of the core wire itself is not strictly constant. Therefore, even if the cutting blade stops at the cutting depth set as set, the core wire touches the core wire to cause a contact flaw. May stick. Although the core wire is positioned at the center of the coating cross section, the core wire actually fluctuates from the center, and the cut blade may damage the core wire.

Further, there are vibrations of the peeling device itself and vibrations received from the installation environment of the device, and the vibration may cause the position of the cutting blade to be disturbed in the cutting depth with respect to the core wire, thereby damaging the core wire.

In view of the above problems, it is an object of the present invention to provide a cutting depth for detecting a perspective relationship between a cutting blade and a core wire of a covered wire when the cutting blade is cut into the covering of the covered wire. In addition to providing a detection method, this method is used to detect the perspective relationship between the cutting blade and the core wire, thereby detecting erroneous contact with the core wire, and easily and accurately cutting when setting the cutting depth. An object of the present invention is to provide a sheathed wire peeling device capable of setting a depth.

[0010]

In order to solve the above-mentioned problems, according to the present invention, an electrode is disposed close to an arbitrary portion of a covered wire, and a pair of electrodes are formed by the electrode and the cutting blade. I did it. When the cutting is performed, the electric capacity between the electrodes is displaced. However, the present invention provides a method for detecting the cutting depth of the cutting blade, which detects the perspective relationship between the cutting blade and the core wire based on the displacement. Here, the perspective relationship includes not only the distance relationship between the cutting blade and the core wire but also the relationship as to whether or not they contact each other. The cutting depth mainly refers to how close the cutting blade is to the core wire. Further, the cutting blade is not limited to a sharp blade, but refers to any blade that is cut into the coating for a predetermined purpose.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a method for detecting a depth of cut according to claim 1 and a peeling apparatus according to claim 2 using this method. An electrode 20 such as an electrode plate is arranged close to the side surface of the insulated wire 10 and the cutting blade 3
When a predetermined alternating current is passed as a measurement signal with either one of the 0 (position before cutting) and the electrode 20 (for example, the electrode 20) as a sending side, it flows to the other side (for example, the cutting blade 30) on the receiver side. From the current, the initial capacitance (Ca in FIG. 2) between the electrodes 20 and 30 can be detected. In this case, the circuit shown in FIG. 3 is formed between the electrodes, X is between the cutting blade and the core wire, and Y is the electrode
This shows a capacitor formed between core wires. FIG.
In the example, the displacement of the signal received by the cutting blade 30 is known through a detection circuit 34 including an input-stage buffer amplification circuit 31, a video band amplification circuit 32, a detection circuit 33, and the like.

At this time, when the cutting blade 30 cuts into the coating 12 and approaches the core wire 11, the electric capacity starts increasing as shown in FIG. 2A, and it can be detected that the cutting blade approaches the core wire just before contact. Further, as shown in FIG. 4, when the cutting blade 30 comes into contact with the core wire 11 (b in FIG. 2), the electric capacity (Cb in FIG. 2) is several to several tens times the initial capacity Ca, and this displacement is obtained. It can be detected based on the contact. It should be noted that whether to detect only the presence or absence of the contact or how close the contact is to be detected in addition to the detection of the contact is a matter of the measurement accuracy of the capacitance.

By using the above-described detection of the perspective relationship, various conveniences can be achieved in the stripping apparatus for the covered electric wire.

For example, in the invention of the peeling apparatus according to the third aspect, the initial setting of the cutting depth of the cutting blade for cutting into the coating is performed. For example, peeling work is generally processed simultaneously with cutting out many wires,
Prior to this processing, the initial setting of the cutting depth stop positioning is set, and thereafter, when the continuous processing of peeling is performed, the cutting is performed to the depth according to the initial setting.

As a specific example of the method, a covered electric wire to be peeled is set at a cutting position of a cutting blade,
The cutting blade is cut at a low speed by driving a pulse motor or the like, and the motor (and thus the cutting blade) is stopped when contact with the core wire is detected. Then, a position at which the cutting blade is slightly separated from the contact position can be calculated, and the calculated position can be set as a cutting depth for a subsequent peeling operation. As a result, the initial setting of the cutting depth, which has conventionally been made by experience and trial and error each time, can be easily and accurately made.

For example, in the peeling apparatus according to the fourth aspect of the invention, the cutting depth is sequentially controlled every time the cutting is performed on the basis of the detection of the perspective relationship between the cutting blade and the core wire of the coated electric wire. In this method, the detection content of the perspective relationship is compared with a predetermined threshold value, and the cutting is stopped at a predetermined depth every time the cutting is performed based on the comparison result. For example, when the cutting blade comes into contact with the core wire, the blade is stopped instantaneously so as not to cut into the core wire, or stopped just before contact.

In the case where the cutting blade is stopped at the time of contact, a minimum amount of scratches will be made on the core wire. However, if the wire is relatively thick, such a small amount of scratches may not cause a problem. It is suitable for such a case. Thereby, the initial setting becomes unnecessary, and when the type of the covered electric wire to be peeled is changed relatively frequently, the trouble of the initial setting can be avoided,
Alternatively, it is suitable for stripping one type of stripped electric wire but having a variation in core wire depth.

On the other hand, in the case of a thin covered electric wire, even a slight contact flaw is considered to be a problem. Therefore, it is necessary to set a depth of cut not to be touched as an initial value and recognize a contacted one as a defective product. is there.

Thus, for example, in the invention according to claim 5, if the core wire of the cutting blade comes into contact with the core wire during the cut for peeling,
This was detected as an erroneous contact, and the insulated wire was recognized as a defective product with a damaged core wire. If contact is detected during peeling, the peeling device may be stopped, and defective products may be removed by hand. If it is a problem in operation to stop each time, means for removing the defective product may be provided near the cutting blade, and the defective product may be automatically removed based on the notification of the detection of the erroneous contact.

[0020]

(Embodiment 1) The following is an insulated wire cutting and peeling apparatus 100, in which the peeling apparatus of the present invention is incorporated in the peeling portion of this apparatus.

The cutting / peeling apparatus 100 of this embodiment cuts out a predetermined length from a raw roll of a covered electric wire, and peels off both ends as necessary at that time, so that it can be used for a line of any electric equipment. It is intended for, in particular, cutting and stripping of short wires.

The main configuration of the cutting and peeling apparatus 100 is as follows.
A pair of forward / reverse rollers 40 for forward / reverse rotation
And a moving blade 30a provided at the delivery destination of the roller 40.
And a pair of cutting blades by the static blade 30b, and a microcomputer (hereinafter, a microcomputer) for controlling the cutting blades. The cutting and peeling of the covered electric wire 10 sent out by the roller 40 is performed by the cutting blade 30. I have. The roller 40
Is driven by a pulse motor, so that the feed amount and the retraction amount of the covered electric wire 10 can be controlled, and the cutting blade 30 can also control the cutting amount and the cutting amount of the moving blade 30a by another pulse motor. Has become.

In front of the roller 40, a conductor tube 20 for passing the coated electric wire 10 is provided as an electrode, so that an alternating current of about 2 MH flows as a measurement signal. A guide tube 50 is provided between the roller 40 and the cutting blade 30, and the cutting blade 3 passes through the covered electric wire 10 sent out by the roller 40.
It is guided to a predetermined position of zero. Although the cutting blade 30 is screwed to a predetermined support member (not shown), the support member and the cutting blade 30 are electrically insulated via an insulating sheet. Similarly, the conductor tube 20 is also electrically insulated from surrounding members. The cutting blade 30 and the conductor tube 20 form a pair of electrodes, and a circuit for detecting the electric capacitance between the electrodes 30 and 20 is connected to the cutting blade 30. That is, when a signal of a predetermined current flows through the cutting blade 30 on the receiving side, an input-stage buffer amplifier circuit, a video band amplifier circuit, a detection circuit, and the like for the flowing current are provided as a detection circuit 34, and the conductor tube 20 is cut off. An electric capacity displacement between the blade 30 and the blade 30 is obtained. The obtained displacement is compared with a threshold value preset in a microcomputer or an electric circuit. The guide tube 50 may be made of a conductive material so that the guide tube 50 also serves as an electrode.

The cutting / peeling apparatus 100 is configured such that the length of the electric wire to be obtained and the length of the peeled ends at both ends can be inputted from an operation panel prior to the operation, and the cutting depth at the time of peeling is automatically measured. Instructions to be made can be made from the operation panel.

The operation will be described below. First, the tip of the coated electric wire 10 pulled out from a raw material roll (not shown) is sandwiched between rollers, manually sent out, and passed through a guide tube,
Be prepared. The length of the wire to be obtained and the length of the peeling at both ends are input to the cutting and peeling device.

In this state, when an initial setting switch (not shown) for automatically measuring the cutting depth is depressed, the tip of the coated electric wire is sent out to the cutting blade as sampling, and the moving blade of the cutting blade is closed and lowered at a low speed. , Are cut into the coating (see FIG. 1). During this time, the conductor tube as an electrode
MH 4V AC current is applied as a measurement signal,
The displacement is compared with a threshold value set in the microcomputer or the electric circuit by the capacitance detection circuit 34 connected to the cutting blade. As a result, the perspective relationship between the cutting blade and the core wire is determined. Monitoring can be continued. When the cut blade comes into contact with the core wire, a sharp displacement appears in the electric capacity (see FIG. 2), and it can be detected from the comparison with the threshold value that the perspective relationship has come into contact. Based on this detection, the microcomputer stops the cutting blade, calculates a position where the cutting blade is slightly separated from the contacted position, and uses the calculated position as an initial cutting depth for the subsequent peeling work. Set it.

In this state, the work is possible, and by pressing the start button, the continuous work of cutting and peeling the covered electric wire is started.

First, as shown in FIG. 5, the excess end 1 'of the covered electric wire is cut off, and as shown in FIG. 6, the total length of the stripped lengths L3, L4 at both ends of the electric wire is sent. In this state, when the cutting blade 30 is cut to the depth according to the initial setting, and the roller 40 is rotated in the reversed state, the covered electric wire 10 is pulled back, and as shown in FIG. It is pulled out from the core wire 11 and peeled.

The subsequent operations are not related to the present invention, but will be continued for reference. That is, the end of the electric wire is peeled, and the core wire of the total peeling L3 + L4 at both ends of the electric wire is exposed, but only the length L1 of the electric wire in which the electric wire in this state is obtained as shown in FIG. Feed and cut again to a depth according to the initial settings. Next, the cutting blade 30 is rotated in the reverse direction as shown in FIG. 9 while the cut is made, and is pulled back by the peeling length L4 at the rear end, whereby the coating 12b is slid and moved to the middle of the wire to be obtained. As a result, both ends are peeled. Finally, as shown in FIG. 10, by feeding the stripped length L4 at the rear end and cutting the rear end position, a desired wire 1 stripped at both ends can be obtained. Thereafter, by repeating the same operation, the cutting and peeling operations of a large number of electric wires 1, 1,... Can be similarly performed.

When the above peeling operation is performed, the cutting blade 3
It is planned that 0 will not contact the core wire 11 and therefore will not be damaged. Therefore, in the apparatus of this embodiment, at the time of cutting in the peeling operation, it is configured to monitor whether or not the cutting blade has erroneously contacted the core wire. The lamp and buzzer are notified, and the device is stopped. Upon receiving the notification, the operator removes the defective product and restarts the device. If frequent intervention of the operator is inconvenient due to a high frequency of erroneous contact detection, a means for removing some defective products may be provided, and automatic removal may be performed to maintain continuous processing. .

(Embodiment 2) The following cutting and peeling apparatus 20
0 is almost the same as that of the first embodiment, and therefore the description will be focused on the differences.

The cutting and peeling apparatus 200 of the second embodiment is
The purpose of the present invention is to cut out a somewhat longer electric wire than in the first embodiment, and a pair of sending / retracting rollers 40 (hereinafter referred to as front rollers 40) and a cutting blade 3 at the tip thereof.
0 and the details thereof are described in Example 1.
Is the same as In the second embodiment, in addition to these, a pair of pull-out / feed-back rollers 41 (hereinafter referred to as rear rollers 41) are provided further ahead of the cutting blade 30, so that they can also be rotated forward and backward. . The rear rollers 41 receive and pinch the electric wires that have passed through the cutting blade 30 and have been sent out, and can draw out and send the electric wires back. A guide tube 51 (hereinafter, “rear guide tube 51”) is provided between the rear roller 41 and the cutting blade 30, and guides the electric wire transmitted through the cutting blade 30 so as to be sandwiched by the rear roller 41. A guide tube 50 provided between the front roller 40 and the cutting blade 30 (hereinafter, referred to as a front guide tube 50).
Similarly to the above, the electric wire to be pulled back is guided to the cutting blade 30.

The difference from the first embodiment is that these front guide tubes 5
0 and the rear guide tube 51 are also used as electrodes (see FIG. 11).
Depending on whether it is on the front roller 40 side or the rear roller 41 side, a 2 MH / 4 V alternating current as an electrode is applied to one of the guide tubes 50/51, and it is a sender of a measurement signal. . Further, a detection circuit for measuring the electric capacity between the “cutting blade 30 and the front guide tube 50” or the “capacity between the“ cutting blade 30 and the rear guide tube 51 ”similar to the first embodiment is connected to the receiving cutting blade 30. Have been.

Next, an operation method of the cutting / peeling apparatus 200 will be described focusing on differences from the first embodiment. First, the point of inputting the wire length to be obtained first and the peeling lengths at both ends is the same as in the embodiment. The same applies to trial cutting of the coated electric wire first and initial setting of the cutting depth.

After the above preparation, the cutting and peeling work is started. Initially, as shown in FIG.
Cut off the extra end 1 'of the length that reaches 1. Next, as shown in FIG. 12, the leading end of the covered electric wire 10 sandwiched between the front rollers 40 is fed out by the peeling length L3, cut by a cutting blade to an initially set depth, and the front roller is reversed to pull back the covered electric wire. This peels off as shown in FIG. At this time, the extra end sandwiched between the rear rollers is further fed by L3 so as not to disturb the peeling (see FIG. 12).

Next, as shown in FIG.
1 and is cut at the rear end of the electric wire 1 while being sandwiched between the rear rollers 41. Then, as shown in FIG. 15, the electric wire 1 sandwiched between the rear rollers 41 is fed back by the peel length L4 at the rear end of the electric wire, and at this time, the covered electric wire 10 on the front roller 40 side is also pulled back and escaped, so that the rear roller 41 Be careful not to hit the wire 1 sent back from the side. The cutting blade 30 is provided on the rear end side of the wire sent back in this manner.
Is cut, and the rear roller 41 is rotated forward as shown in FIG. 16 to peel off the rear end.

Regarding detection of erroneous contact during peeling,
Determines whether the stripped wire is on the front or rear roller side and applies a guide tube as an electrode to apply an AC voltage for measuring the electric capacity. May be switched each time.

In addition, if the stripped portion is on the leading end side of the wire, the wire is connected to the raw material, and the erroneous contact at the time of stripping can be detected, for example, by the following method other than the present invention. That is, a voltage is applied to the coated electric wire of the raw roll,
It is also possible to monitor and detect electrical continuity at the time of contact with the core wire on the cutting blade side. This is because the material to be pulled out for cutting is the inner peripheral end of the material roll, so that a voltage can be applied to the other outer peripheral end. However, such a method can be used in the case of the first embodiment, but the peeling of the rear end of the electric wire in the case of the second embodiment causes erroneous contact because the electric wire is separated from the raw material roll. Cannot be detected. In this regard, according to the peeling device capable of detecting erroneous contact of the present invention,
In the case of the second embodiment, erroneous contact of the rear end peeling can be detected.

In the first embodiment, the operation of the front roller, the rear roller, and the cutting blade by the microcomputer, the input of the length of the electric wire and the peeling length of both ends, and the provision of an operation panel for the operation are provided. Is the same as

The present invention is not limited to the above embodiment. In the embodiment, the blade for cutting the coated electric wire and the blade for peeling the coating are also used, but these may be provided separately. Further, a simple peeling device provided separately from the cutting device may be used. The method of detecting the cut depth is not limited to peeling, but may be detection for any purpose. The measurement signal used may be an alternating current of any frequency, and may be selected according to the covered electric wire in question. Further, the measurement signal is not limited to an alternating current and may be a direct current signal such as a pulse. In addition, the same applies to means using a frequency generation circuit and a time generation circuit having a correlation with the electric capacity (for example, to derive the electric capacity value and the change value by the transmission frequency or the generation time). Further, either the electrode element or the cutting blade may be used as the sending side and the receiving side of the measurement signal. A more accurate displacement can be obtained by shielding the electrode and the cutting blade from noise from the surroundings. Moreover, the peeling is not limited to the peeling at the end of the covered electric wire, but may be the peeling at an intermediate portion of the electric wire.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining the concept of the present invention, and shows that a circuit as shown in FIG. 3 below can be formed between a cutting blade 30 and an electrode of an electrode element 20.

FIG. 2 shows a change in electric capacity between the cutting blade 30 and the electrode of the electrode 20 when the cutting blade 30 shown in FIG. 1 is cut down.

FIG. 3 is a circuit diagram between the cutting blade 30 and the electrodes of the electrode element 20 shown in FIG.

FIG. 4 is an explanatory diagram of a state in which a cut down from the state of FIG. 1 touches a core wire.

FIG. 5 is an explanatory diagram of the cutting / peeling apparatus shown in the first embodiment.

FIG. 6 is also a similar explanatory view, and illustrates peeling of the tip.

FIG. 7 is a similar explanatory view, and illustrates peeling of the tip.

FIG. 8 is also a similar explanatory view, illustrating peeling of the rear end.

FIG. 9 is also a similar explanatory diagram, illustrating peeling of the rear end.

FIG. 10 is a similar explanatory view, and illustrates the cutting of the rear end.

FIG. 11 is an explanatory diagram of the cutting / peeling apparatus shown in the second embodiment.

FIG. 12 is also a similar explanatory diagram, and illustrates peeling at the tip.

FIG. 13 is a similar explanatory view, and illustrates peeling of the tip.

FIG. 14 is also a similar explanatory diagram, illustrating the cutting of the rear end.

FIG. 15 is also a similar explanatory view, illustrating peeling of the rear end.

FIG. 16 is also a similar explanatory view, illustrating peeling of the rear end.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Stripped electric wire 11 Core wire 12 Coating 20 Electrode 30 Cutting blade 40,41 Roller 50,51 Guide tube 100,200 Cutting and peeling apparatus

Claims (5)

[Claims] When a cutting blade is cut into a covering of an insulated wire, a pair of electrodes are formed by an electrode element disposed close to an arbitrary portion of the insulated wire and the cutting blade, and the cutting is performed when the cutting is performed. A method for detecting a cutting depth of a cutting blade, comprising detecting a perspective relationship between the cutting blade and a core wire of the covered electric wire based on a displacement of an electric capacitance between a pair of electrodes. 2. A peeling apparatus for providing a cut in a desired portion of a covered electric wire by a cutting blade and peeling the cut wire, wherein a pair of electrodes are formed by an electrode element arranged in close proximity to an arbitrary portion of the covered electric wire and the cutting blade, A peeling apparatus for detecting a perspective relationship between the cutting blade and a core wire of the covered electric wire based on a displacement of an electric capacity between the pair of electrodes caused when cutting into the covering. 3. The peeling apparatus according to claim 2, wherein the initial setting of the cutting depth of the cutting blade cut into the coating is performed based on the detection of the perspective relationship between the cutting blade and the core wire of the coated electric wire. Characterized peeling device. 4. The peeling apparatus according to claim 2, wherein the depth of cut is sequentially controlled each time the cut is made in the coating based on the detection of the perspective relationship between the cutting blade and the core wire of the coated electric wire. apparatus. 5. The peeling apparatus according to claim 2, wherein an erroneous contact of the cutting blade with the core wire is detected based on a detection of a perspective relationship between the cutting blade and the core wire of the covered electric wire. .