JPS6025457A - Coating removal detector of electric wire terminal - Google Patents

Abstract

PURPOSE:To eliminate the need to adjust a contact plate even when a core conductor is different in diameter, and to detect securely whether a coating is removed properly or not by arranging two contact plates between side edges on the same plane at an interval. CONSTITUTION:Two contact plates 3 and 4 made of an elastic conductor plate are installed between side edges on the same plane at an interval 5, and base parts 6 and 7 of the contact plates 3 and 4 are fitted to a slanting part 2 provided to a base 1 with screws 8 and 9. Then, the core conductor (f) after the clad of an electric wire terminal is removed is slid to contact both contact plates 3 and 3 while passed as shown by an arrow, and consequently the core conductor (f) short-circuits both contact plates 3 and 4, so a detecting circuit is closed to display the exposure of the core conductor. If the coating is removed insufficiently and the core conductor (f) is not exposed completely, both contact plates 3 and 4 are not short-circuited, so the exposure is not displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting whether the sheathing at the end of an electric wire is completely removed and the core conductor is exposed. Internal wiring is generally done by cutting relatively small-diameter wires, such as wires with a core cross-sectional area of 3-3 or less, into regular lengths, removing the terminal sheath, and attaching terminals. In the internal wiring of automobiles, etc., a series of operations such as measuring, cutting, removing terminal insulation, and attaching terminals are performed using automatic machines. In this series of operations, the removal of insulation is important, and it is important to ensure that the insulation is sufficient. If the terminals are attached without being removed, there will be poor continuity between the terminals and the core wire, which will lead to major trouble when the product is manufactured.

For this reason, in order to inspect whether the terminal coating has been sufficiently removed and the core conductor is exposed, an inspection device like the one shown in Figure 1 has been used, but this has many malfunctions and is not suitable for proper inspection. There was a drawback that it could not be done. Figure 1 shows a conventional inspection device, in which the tip of the contact α made of an elastic conductor plate is attached to a base C as a free end, and the contact 6 made of a fixed conductor plate is attached to the base C. A slit e is formed between the free tip of the elastic conductor plate contact σ and the contact itself,
Connect both contacts a and 'cL to the detection circuit, cut the wire to a specified length, remove the terminal covering of the wire, and insert the exposed core wire f into the above-mentioned slit e.
It is configured so that the passing core wire f shorts both contacts α and itself to close the detection circuit, and when the coating is sufficiently removed and the core wire is completely exposed, both contacts σ and d short-circuited, and the coating was not sufficiently removed.'F:? When the wire is not completely exposed, both contacts α and themselves are not short-circuited, thereby detecting whether or not the coating has been removed. With such conventional devices, even if the sheathing is insufficiently removed and the sheathing remains on the core wire, the diameter of the wire end passing through the slit θ becomes larger by the amount of the remaining sheathing. When passing through the gap e, the free tip of the contact α recoils and comes into contact with the contact L, closing the detection circuit, resulting in a malfunction that results in the same display as if the coating had been completely removed. . If the rigidity of the elastic conductor plate α is increased in order to prevent malfunctions caused by this reactionary contact, there will be a drawback that the core wire will bend when passing through the slit θ, and if the size of the core wire changes, the adjustment screw g will It is necessary to adjust the gap θ, and not only is this fine adjustment not easy, but the above-mentioned malfunction is likely to occur if this adjustment is not performed properly.

The present invention provides a detection device that does not cause malfunctions as described above and does not require adjustment work, and its configuration will be explained below with reference to illustrated embodiments.

Figures 2, 3, 4, 5, and 6
The figures show various embodiments of the present invention.

In the embodiment shown in FIGS. 2 and 3, 1 is a base, 2 is an inclined surface for attaching a contact plate provided on the base 1, and two contact plates 3.4 made of elastic conductor plates are attached. Distance 5 between mutual lateral edges
the base 6 of each contact plate 3.4.
．． 7 is attached to the slope portion 2 of the base 1 with screws 8.9, each tip of both contact plates 3.4 is a free end 10.11,
Both contact plates 3.4 are connected to an appropriate detection circuit to constitute the detection device of the present invention.

In the device of this embodiment, if the core conductor f from which the sheath of the wire end has been removed is allowed to slide in contact with both contact plates 3.4 while passing in the direction of the arrow shown in the second figure, the core conductor f can be brought into contact with both contact plates 3.4.
4 is short-circuited, the detection circuit is closed and an indication that the core conductor is exposed is made. If the core conductor f is not completely exposed due to insufficient removal of the covering, both contact plates 3.4 are not short-circuited and the above-mentioned indication is not made.

In this way, it is possible to detect whether or not the coating has been removed.

The embodiment shown in FIGS. 4 and 5 has two contact plates 21 and 22 mounted on the side surface of the base 20, instead of providing a slope part on the base and attaching the contact plate as in the previous embodiment. 23.24
are attached with screws 25.26, each contact plate 21.22 is bent at the bent part 27.28 and installed diagonally, each tip of both contact plates 21.22 is a free end 29.30, and the base 2
A damper member 32 made of foamed plastic, hard rubber, etc. is attached to the receiving plate 131i/(, which is erected from 0, and the free end 29.30 of the double-sided point plate 21.22
Both contact plates 21.22 are installed on the same plane, and there is a gap of 33 mm between the side edges of both contact plates 21.22.
and connect both contact plates 21 and 22 to an appropriate detection circuit.

In this embodiment as well, 1. The presence or absence of removal of the coating is detected by passing the conductor f in sliding contact with both contact plates in the direction of the arrow in Fig. 4, but since the damper member 32 is provided, the core wire conductor The vibration of the free end when passing the free end 29, 30 of the plate is absorbed by the damper member 32, and vibration fatigue of the contact plate can be reduced.

The elastic conductor plate constituting the contact plate in each of the above embodiments is a metal plate made of phosphor bronze, beryllium steel, nickel silver, stainless steel, or the like, or an elastic plastic plate whose surface is plated, vapor-deposited, or pasted with a conductive metal. It is desirable to use a plate material with a thickness of 2 mm or less that does not bend the core conductor. In addition, the shape of the contact plate is in addition to the thin rectangular plate shown in FIGS. 3 and 4 of each of the above embodiments.
As shown in Figure 6, the width of the plate with constant wall thickness may be made into a uniform beam shape that gradually decreases toward the tip, and by doing so, the life of the contact plate can be extended.

In each of the above embodiments, as shown in FIGS. 3 and 5, the two contact plates are separated from each other and attached to the base to form a gap of 5.33 between the side edges of both contact plates. However, since it is sufficient that both contact plates are not in electrical contact, an insulator may be interposed between the side edges of both contact plates to form a gap of 5.33, or a gap of 5.33 between the side edges may be formed. It is also possible to form two contact plates on one elastic insulating plate by plating, vapor deposition, pasting, etc.

As mentioned above, in the present invention, since the two contact plates are installed on the same plane with a gap between the side edges, the wire end coating is not completely removed, and the contact plate remains on the core conductor. The free end of the contact plate is thick (even if it vibrates, the contact plate will not short-circuit and rely on detection like in the past, and even if the diameter of the core conductor is different, it will not There is no need to adjust the contact plate using adjustment screws, and the core conductor is not bent by the contact plate, making it possible to reliably detect the suitability of coating removal even after long-term use. Although it has a remarkable effect that other devices do not have,

[Brief explanation of drawings]

Fig. 1 is a perspective view of a conventional device, Fig. 2 is a front view of one embodiment of the device of the present invention, Fig. 3 is a side view thereof, Fig. 4 is a front view of another embodiment, and Fig. 5 6 is a side view thereof, and FIG. 6 is a drawing showing another embodiment of the contact plate. 1, 207 people 3.4.21.22: Contact plate 5.33: Spacing 32; Damper component patent applicant Furukawa Electric Co., Ltd. Representative Patent attorney example 1) Kikuji (FJ or 1 person) 1st Figure 2 Figure 4 Figure 3 Figure 5 Broom Figure 6

Claims (1)

[Claims] 1. Install two elastic conductor contact plates on the same plane with a space between their side edges, attach the bases of both contact plates to the base, make the tips of both contact plates free ends, and An electric wire terminal characterized in that presence or absence of sheathing removed from the electric wire terminal is detected by short-circuiting both contact plates by a core wire conductor whose sheath has been removed by passing all ends of the 'fIL wire terminal through the free end of the contact plate. Coating removal detection device. 2. The device for detecting coating removal from an electric wire end as set forth in claim 1, further comprising a damper member disposed opposite to the tip of the conductor plate, with which the tip of the conductor plate comes into contact.