JPS5852406B2 - Lead wire coating intermediate strip method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lead wire covering intermediate strip construction method used in manufacturing lead wires for connecting movable contacts in relays.

Generally, in a relay that is formed by welding one end of a lead wire to a movable contact, as shown in Figure 1, the middle position of the core wire 6' exposed from the end of the covering 2 of the lead wire 1' is spotted. Spot welding to the movable contact 11 with a welding machine 10,
One end of the lead wire 1' was electrically connected to the movable contactor 11.

However, in such a relay, the opening/closing test was conducted after welding of the lead wire 1' was completed, so during this testing process, the core wire 2 at the tip of the spot weld broke, and it fell between the contacts, causing the relay to malfunction. It was causing this.

Therefore, after processing the tip of the core wire 6' by primary spot welding, it is connected to the movable contact 1 by secondary spot welding.
1, and the lead wire 1'
If the ends of the core wire 6' are not treated in the process, the exposed core wire 6' may twist back or bend, making it impossible to proceed to the next step and requiring rework.

The present invention peels off the coating at the middle part of the covered electric wire in order to efficiently process the exposed end of the covered electric wire as described above or to enable electrical connection at the middle part of the covered electric wire. It is an object of the present invention to provide a lead wire covering intermediate stripping method that allows the covering to be peeled off to any desired length at any position on a covered electric wire without cutting the core wire.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 2 shows a schematic diagram of the entire process from peeling off the covering 2 of the covered wire 1 by the lead wire covering intermediate stripping method of the present invention to forming the lead wire for connecting the movable contact 11 of the relay. .

In FIG. 2, reference numeral 1 denotes a covered wire having a covering 2 applied thereto, and the long covered wire 1 is fed continuously or intermittently to the right in the drawing.

In the process of feeding the coated wire 1, the first step (2) is to make cuts 4 all around the sheath 2 at predetermined intervals using V-shaped cutters 3□1, 3□2, 32□, 3□2.

■Type cutter 3□1... has an opening angle of 9 as shown in Figure 3.
00 V-shaped kerf grooves 12 are formed, and when the pair of V-shaped cutters 311, 312... are at the cutting position, the kerf grooves 12 of these ■-shaped cutters 311... create a substantially square gap 9. One side of this substantially square void 9 is equal to the diameter (
For example, the length dimension is slightly larger than 0.6φ (for example, 0.6φ).
8φ) to prevent damage to the core wire 6 when making cuts as shown in FIG. 4A in the sheath 2 of the covered electric wire 1.

Here, pairs of ■-shaped cutters 31□... are arranged on the left and right sides with respect to the feeding direction of the covered electric wire 1, and each pair of ■-shaped cutters 3□1... are arranged above and below the covered electric wire 1. may be placed facing each other.

The next step (2) is a step of forming a straight cut 7 in the axial direction of the covered wire 1 in a part of the sheath 2 between the pair of circumferential cuts 4.4 formed in the above step I.

However, in the lever step (2), numeral 5 is a heat cutter, which is pressurized to a temperature higher than the heat resistance temperature of the material of the sheath 2 of the sheathed wire 1, and the heat cutter 5 is attached to the wire shaft of the sheathed wire 1. By lowering this heat cutter 5, the entire circumferential cut 4,
Both ends are located at 4, and the depth reaches core line 6 or core line 6
A substantially linear cut 7 slightly shallower than the outer peripheral edge is made in the same direction as the wire axis, as shown in FIG. 4B.

In the subsequent process (3), the coating 2 between the circumferential cuts 4 and 4 is peeled off, and in FIG.
It is shown rotated 0° with the side facing forward.

As shown in FIGS. 5a and 5b, the stripping jig 8 has a pair of jig bodies 13, 13 facing each other on both sides above the insulated wire 1, and a receiver 14 that receives the insulated wire 1 from below. The lower facing surface of the jig main body 13°13 is coated with a coating 2.
Nails 15 and 15 are formed to protrude in opposite directions, respectively, for pressing and peeling the core wire 6. The spacing between the tips of the nails 15 and 15 is made to have a width slightly wider than the diameter of the outer circumference of the core wire 6. be.

When stripping the sheathing 2, the sheathing 2 is removed in a direction perpendicular to the wire axis using the claws 15 and 15 of the jig bodies 13 and 13 on both sides of the straight cut 7 of the sheathed wire 1, as shown in FIG. The peeling jig 8 is inserted between the presser foot and the receiver 14 on the lower side of the coated wire 1, and the stripping jig 8 is moved in a direction perpendicular to the wire axis, and the peeled coating 2' is pulled out downward as shown in Fig. 4C. ,
As shown in the figure, an exposed portion of the core wire 6 is obtained at the middle portion of the covered wire 1.

Thus, in the post-process (2), the exposed wire 6' is twisted as shown in the fourth figure by twisting the covered wire 1 on the tip side of the exposed portion of the stranded core wire 6 using the twisting device 16, and then the spot The central part of the exposed core wire 6' is spot welded using the welding machine 10 as shown in the figure E, and further, in step (2), this spot welded part This is what gets the line.

Here, when twisting the exposed core wire 6 by the twisting device 16, in step (2), the covered wire 1 is
After cutting is completed, the portion of the long covered wire 1 on the tip side from the exposed core wire 6' is twisted with a twisting device against the fixed covered wire 1 portion on the base side from the exposed core wire 6'. 16, thereby performing a twisting process on the exposed core wire 6', and spot welding is performed after this twisting process.

As described above, the present invention comprises a pair of ■-shaped cutters that pinch a long insulated electric wire from both sides and cut only the sheathing, which are arranged at predetermined intervals in the longitudinal direction of the insulated electric wire. The step of making cuts all around the entire circumference at the required intervals only in the coating, and cutting at least one part of the outer surface of the coating parallel to the axial direction of the covered wire between the circumferential cuts formed at the required intervals in the coating. A step of forming a substantially linear cut on the side surface from the outer surface of the sheath to the twisted core wire or slightly shallower than the outer periphery of the core wire using a heat cutter heated to a temperature higher than the heat-resistant temperature of the sheathing material, and a step parallel to the axis of the wire. a peeling step of holding the coatings located on both sides of the linear cut in a direction perpendicular to the wire axis and peeling off the cut portion in a force direction perpendicular to the linear cut using a peeling jig that advances from the linear cut in a direction perpendicular to the wire axis; It includes a twisting process in which the exposed core wire whose coating has been peeled off in the stripping process is twisted by a twisting device, a welding process in which the twisted exposed core wire is welded, and a cutting process in which the welded portion of the exposed core wire is cut after the welding process. Therefore, by providing a pair of ■-shaped cutters in the longitudinal direction of the insulated wire and making cuts all around the insulated wire, it is possible to make cuts in the sheathing at any length. By making a straight cut in the notched sheath in the direction of the wire axis and moving the peeling jig in a direction perpendicular to the straight cut, the sheath can be easily peeled off to expose the core wire. Furthermore, since the twisted exposed core wire is twisted by a twisting device, the twisted exposed core wire is welded, and then cut, it is possible to create a stranded covered wire. It is possible to perform coating stripping treatment at any intermediate position of the coated electric wire without cutting the multi-core wire, and has the effect that this stripping treatment can be performed at any length, By welding the ends of the core wire, it is possible to easily connect the lead wires.

In addition, especially when the present invention is used in the process of processing the ends of lead wires, the process can be separated because the ends can be processed without the process of cutting the covered wire, resulting in a significant improvement in productivity. It has the effect that it can.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the welding state of one end of the lead wire to the movable contact, Fig. 2 is a schematic diagram of an embodiment of the present invention, and Fig. 3 is an enlarged side view of the main part at the cutting position of the same ■-shaped cutter. , FIGS. 4A to 4F are enlarged perspective views of the coated wire processing state in each step of the same as above, FIGS. 2 is coating, 3
11゜3.2, 3□1, 3□2 are V-shaped cutters, 4 is a full circumference cut, 5 is a heat cutter, 6 is a core wire, 7 is a straight cut, 8 is a peeling jig, 9 is a gap, 16 is a twisting device.

Claims (1)

[Scope of Claims] 1. A pair of ■-shaped cutters that cut only the sheath by pinching a long insulated electric wire from both sides are arranged at predetermined intervals in the longitudinal direction of the insulated electric wire, and the insulated electric wire is On the other hand, a process of making all-around cuts only in the sheathing at required intervals, and at least one place on the outer surface of the sheathing parallel to the axial direction of the sheathed wire between the all-around notches formed at the required intervals in the sheathing. forming a substantially linear cut from the outer surface of the coating to the twisted core wire or slightly shallower than the outer periphery of the core wire using a heat cutter set to a temperature higher than the heat-resistant temperature of the coating material;
The coatings located on both sides of the linear cut parallel to the wire axis are held in a direction perpendicular to the wire axis, and the cut portion is peeled off in a direction perpendicular to the linear cut using a peeling jig that advances from the linear cut in a direction perpendicular to the wire axis. a twisting process in which the exposed core wire from which the coating has been peeled off in the peeling process is twisted by a twisting device; a welding process in which the twisted exposed core wire is welded; and the welded portion of the exposed core wire is cut after the welding process. A lead wire covering intermediate stripping process characterized by comprising a cutting process. 2. The cutter according to claim 1, characterized in that the cutter has a substantially square gap at the cutting position, and one side of the gap is set to be slightly larger than the diameter of the outer circumferential circle of the core wire. Lead wire coating intermediate strip method.