JPH0251227B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for cutting electric wires, which is performed by sequentially moving the electric wire through the steps as a series of assembly operations, including cutting of the insulated electric wire, stripping off the sheath, detecting the stripping, and crimping the terminal. The present invention relates to a sheath stripping detection device for detecting a sheath stripping state in a sheath stripping and terminal crimping device.

An example of a conventional coating stripping detection device used in the above-mentioned electric wire cutting, coating stripping, and crimping device (hereinafter referred to as a terminal crimping device) is shown in FIG. That is, the wire w is coated so that it passes between a pair of contacts such as leaf springs S, S, etc., which face each other parallel to the wire conveying direction and at a distance slightly smaller than the conductor diameter of the wire. Stripping is detected by utilizing the fact that when the stripped conductor _w1 passes, the circuit between both contacts is closed.

However, such conventional known techniques have the following drawbacks and problems.

(b) It only detects the presence or absence of the coating, and cannot detect the stripping length (the distance between the tip and rear end of the exposed conductor after the coating has been stripped off), which is an important quality characteristic of stripping the coating.

(b) Since the wire passes between narrow contacts, the tip of the wire is bent, which adversely affects the quality of the product when crimping the terminal.

The present invention focuses on the above-mentioned drawbacks of the prior art, and
The purpose of this system is to simultaneously detect the position of the tip of the conductor, the length of stripping, etc. during sheath stripping without moving the wire during sheath stripping detection, and to detect whether sheath stripping is complete.

The configuration adopted by the present invention to achieve the above object will be explained below based on the drawings.

FIG. 2 shows a planar configuration of a typical terminal crimping device A, which includes a main body 1, a wire feeding section 2, a wire cutting section 3, a conveying section 4, a wire gripping device 5, a sheath stripping section 6, a stripping detection section 7, and a terminal. It is composed of a crimping part 8. Note that w is an electric wire.

FIGS. 3 to 6 are diagrams of the peeling detection section,
FIG. 3 shows a side view of the tear-off detector, in which the detector B is mounted on a vertical sliding plate B' and is moved up and down along the guide surface of the frame B'' by means of a cylinder (not shown).

FIG. 4 shows a partial detailed cross-sectional view of the wire contact portion of the detector B shown in FIG. It is provided so as to be slidable along a guide groove 11' provided in Example 1), and is capable of approaching and separating at right angles to the axial direction of the electric wire w. The electric wire w is supported by an electric wire holder 12, and the electric wire holder 12 is formed with a stepped portion 12a that matches the thickness of the covering of the electric wire.

FIG. 5 shows a cross-sectional view taken along the line V-V in FIG. There are instructions for inserting it. The guide tube 14 is supported by a tube support plate 16, the board 13 is connected to a connector 17, and the lead wire 18 is connected to a judgment display (not shown) (see FIG. 3).

Next, the operation of coating peeling detection will be explained.

In FIG. 2, the covered electric wire w is fed by a feeding mechanism 2 for a predetermined length and cut by a cutting section 3, and the electric wire w gripped by a gripper 5 is transferred by a conveying mechanism 4 to a coating stripping section 6 for stripping detection. section 7 and terminal crimping section 8.

When the electric wire w cut to a fixed size and partially stripped of its covering is conveyed to the detection unit 7, the detector B acts as a guide plate.
B' is at the top dead center position (the state shown in FIG. 3 is the bottom dead center position), and when the movement of the wire is completed, the detector B operates in the direction of the arrow P, and the contactor 10 and the wire holder 1
2 to the bottom dead center position sandwiching the conductor w ₁ and sheathing w ₂ at the end of the wire, and after the contact 10 and the wire w come into contact, the coil spring 15 presses and biases the contact 1
0 maintains contact with the electric wire w.

In FIG. 4, some of the contacts 10b to 10e in contact with the wire conductor _w1 at the end of the wire are electrically connected to the wire holder 12, and the circuit between the contacts 10b to 10e and the wire holder 12 is Receiver 12, wire conductor w ₁ ,
Contacts 10b to 10e, upper projection 10', coil spring 15, guide tube 14, board 13, connector 1
7. The lead wire 18 is closed via a judgment indicator, and a continuity signal is displayed on the judgment indicator (for example, a lamp is lit).Alternatively, each contact may be made conductive through the wire conductor _w1 to obtain a continuity signal. .

Contactor 10f~1 in contact with sheathing _w2 of electric wire w
0j, no continuity is obtained. Further, since there is no contact with the contacts 10a, conduction cannot be obtained, and the conduction signals corresponding to these contacts are not displayed on the determination display.

In the example shown in FIG. 4, the tip position of the wire conductor _w1 is located between the contacts 10a and 10b,
The position of the rear end is between the contacts 10e and 10f, and the stripped length of the sheath can be detected as corresponding to the length of the wire conductor, and the wire w is attached to the crimp terminal C in the terminal crimping process shown in FIG. If crimped,
The position of the tip or rear end of the wire conductor _w1 is determined to be "good" within the allowable range _C1 or _C2 .

FIG. 8 shows a contact 19 of a different configuration, and FIGS.
The contacts 10 shown in FIG. 6 are aligned with guide grooves 11' with some spacing (1 mm) apart, but the one in FIG. 8 has no grooves and each contact 19
Insulating coating or insulating film 1 on the surface of
9', and each contact 19a, 1 is placed between the guide side plates.
The surfaces of 9b, 19c, . . . are aligned so as to be in contact with each other, and it is possible to detect the coating removal dimension more accurately than a contactor having a guide groove.

As explained above, conventional coating stripping detection only detects the presence or absence of coating, whereas the present invention can detect the tip and rear end positions of the wire conductor, and the tip of the conductor during the terminal crimping process. , it is possible to detect whether or not the rear end is within the allowable range, and the wire is not moved at the time of detection, so the tip part does not bend and the terminal can be crimped securely.

[Brief explanation of the drawing]

Figures 1A and 2B are a plan view and a side view of an example of a conventional sheath stripping detection device for a crimping device, and Figure 2 is a plan view showing the general configuration of a wire cutting, sheath stripping, stripping detection, and terminal crimping device. , FIG. 3 is a side view of an embodiment of the coating stripping detection device according to the present invention, FIG. 4 is a sectional view of the wire contact portion of the detector of FIG. 3, and FIG. 5 is a sectional view taken along the line of FIG. FIG. 6 is a cross-sectional view taken from FIG. 5, FIG. 7 is a side view of the state in which the terminal and the electric wire are connected, and FIG. 8 is a perspective view showing another embodiment of the contact. A...terminal crimping device, B...detector, C...terminal, 10...contact, 12...wire holder, 15...
...Coil spring.

Claims (1)

[Claims] 1. A detector having a plurality of contacts that are mutually insulated and movable and arranged in parallel in the axial direction of the wire is provided so as to be movable toward and away from the wire holder, and the wire holder is attached to each contact. Detection of wire sheath stripping in a terminal crimping device, characterized in that an elastic member is provided that biases the wire in the gold direction, each contact is connected to a detection circuit, and determination is made based on the presence or absence of contact between each contact and the wire conductor. Device.