JPH0419982A - Method for inserting waterproof rubber stopper - Google Patents

Abstract

PURPOSE:To prevent a covered conductor from being curved and a core from sticking into a waterproof rubber stopper and easily and surely insert the waterproof rubber stopper by passing a guide pin made to abut on the end of a feed pipe through the waterproof rubber stopper while pushing out the same, and then pulling the feed pipe out of the waterproof rubber stopper. CONSTITUTION:With a guide pin 3 being inserted into a waterproof rubber stopper 2 from the direction of the through hole 2c of the stopper 2, clampers 4A, 4B are each fitted over the outer periphery of the waterproof rubber stopper 2 to shape the stopper 2. Under these conditions the guide pin 3 is inserted into the through hole 2c of the waterproof rubber stopper 2 from the rear end side of the stopper. A covered conductor 1 from which a core la is exposed is passed through a feed pipe 5. Next the end portion of the feed pipe 5 is inserted into the through hole 2c of the waterproof rubber stopper 2 and brought close to the taper portion 3a of the guide pin 3. Then the clampers 4A, 4B are each sent out and the waterproof rubber stopper 2 sandwiched between the clampers 4A, 4B is sent out and fitted around the outer periphery of the insertion tube portion 5a of the pipe 5 and then the guide pin 3 made to abut on the end of the insertion tube portion 5a is pushed out of the waterproof rubber stopper 2. Then the feed pipe 5 is pulled out in the direction indicated by the arrow whereby the waterproof rubber stopper 2 is inserted into the terminal of an insulating cover 1b.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a waterproof rubber plug in a waterproof connecting terminal in which the connecting terminal is attached to the end of a covered electric wire through the waterproof rubber plug. Regarding the insertion method.

(Prior art) In this type of waterproof connection terminal, a female connection terminal 13, such as a tab contact, is attached via a waterproof rubber stopper 12 inserted into the end of a covered electric wire 11 as shown in FIG. The other waterproof connection terminal connected thereto is a similar wire assembly to which a female connection terminal such as a receptacle contact (not shown) is attached.

The other waterproof connection terminal described above is fitted with a trumpet-shaped flexible tube member 14 that is press-fitted into the waterproof rubber stopper on the proximal end side and covers the female connection terminal. When the connecting terminal 13 and the female connecting terminal are fitted and connected, the tip side of the flexible tube 14 is press-fitted into the waterproof rubber stopper 12, and the flexible tube 14 connects to the internal connection part. It seals to prevent water droplets from entering.

When performing the above wire assembly, the insulation coating 11b of the terminal is stripped and the core wire 11 is removed as shown in FIG.
The electric wire 11 with exposed strands a and the cylindrical body 12a
A waterproof rubber stopper 12 with a plurality of sealing annular flanges 12b protruding from the outer periphery thereof, and a fitting connection piece 13 for a connection terminal 13.
A terminal material 15 is prepared by punching a conductive metal plate into a developed shape of each of the material pieces 15a, 15b, and 15c constituting the core wire holding piece 13b and the covering holding piece 13c, respectively.

The electric wire 11 is inserted into the through hole 12 from the rear end side of the waterproof rubber stopper 12.
c, and insert the core wire 11a into the cylindrical body 12 as shown in FIG.
A waterproof rubber stopper 12 is fitted and attached to the outer periphery of the insulating cover 11b adjacent to the core wire 11a while protruding toward the front end side of the core wire 11a. Thereafter, the terminal material 15 is pressure-molded using a terminal crimping machine (not shown) to form the material piece 15a into a fitting connection piece 13a, and a core wire holding piece 13b is formed in which the material piece 15b crimps the core wire 11a in an embedding shape. The material piece 15c is the insulation coating 11
They are processed so as to each constitute a covering clamping piece 13c that presses the parts b in a conjugate manner.

Incidentally, the series of operations described above are sequentially performed in a continuous state by an automatic wire terminal processing device.

As described above, conventionally, several methods have been used to insert the waterproof rubber stopper 12 into the electric wire 11.

First, the method shown in FIG. 5(A) is to
The electric wire 11 with the core wire 11a exposed by stripping is inserted into the through hole 12C of the waterproof rubber stopper 12 as it is.

Further, the method shown in FIG. 5(B) is based on the method shown in FIG.
The electric wire 11 is inserted into the through hole 12c of the waterproof rubber stopper 12 without being stripped, and then the terminal coating 11b is stripped.

The above two methods are the most common methods, but in order to enhance the waterproof effect, the insulation coating 11b of the electric wire 11 is inserted in a tight fit into the through hole 1.2c of the waterproof rubber stopper 12. , there is no play dimension between the two, resulting in the following problems.

In the former case, the wire 11 may be bent during insertion, making it difficult to insert, or a portion of the core wire 11a may pierce the inner wall surface of the through hole 12c and be deformed, or may come undone, making it difficult to crimp the connection terminal after insertion. Problems arise, such as making work difficult.

In the latter case, as in the former case, the wire 11 may be bent during insertion, making it difficult to insert it, or a sheath stripping machine may be required in addition to the terminal crimping machine to strip the terminal sheath after insertion. There were problems such as the need to secure a large area for installation and processing.

Furthermore, in order to prevent the bending of these electric wires 11 and the piercing deformation and unraveling of the core wire 11a, the sixth
The method shown in the figure has also been adopted.

In this method, the guide tube 16 is inserted into the through hole 12c of the waterproof rubber stopper 12 while expanding the diameter of the through hole 12c,
A concentrator ring 17 disposed in front of this guide tube 16 is used.

This wire concentrating ring 17 is constructed by combining ring pieces of the same shape and semicircular shape which are divided into two halves at the top and bottom so that they can be separated and removed. A tapered guide hole 17a is formed to guide the guide hole 17a.

Is the terminal insulated when inserting it? ! The electric wire 11 with the core wire 11a exposed by stripping the cover 11b is attached to the wire concentration ring 1.
When inserted into the guide hole 17a of No. 7, the guide hole 17a
The electric wire 11 can be inserted into the guide tube 16 while the core wire 11a is guided along. After insertion, the guide tube 16 is pulled out backward from the through hole 12c of the waterproof rubber stopper 12, and the wire collection ring 17 is disassembled and removed. It is also possible to attach a waterproof rubber stopper 12 to the case.

(Problems to be Solved by the Invention) In the method shown in FIG. 6, the wire 11 may be bent during insertion, making it difficult to insert, or a portion of the core wire 11a may pierce the inner wall surface of the through hole 12c, resulting in deformation. The fifth
The problem is solved by the method shown in Figure 6 (A).
There is no problem when the core wires 11a are tightly bundled as shown in FIG. 6(B), but when the core wires 11a are unraveled in a manner that spreads out toward the end as shown in FIG. 6(B), the following problem occurs.

That is, depending on the degree of unraveling of the core wire 11a, the core wire 11a
The tip of the guide hole 1, which should originally be slidingly guided, has an acute angle at which it comes into contact with the tapered guide hole 17a.
7a, on the other hand, causes the core wire 11a to unravel further into a shape that widens toward the end.

Therefore, the present invention aims to provide a method for inserting a waterproof rubber stopper that can solve these problems.

[Structure of the invention]

(Means for Solving the Problems) The gist of the present invention is to provide a method for inserting a waterproof rubber stopper into the end of a coated wire whose core wire is exposed by stripping the end of the insulation coating, and a method for inserting a guide pin into the waterproof rubber stopper. At the same time, insert the insulation coating into the delivery pipe, insert the delivery pipe together with the insulation coating into the waterproof rubber stopper, and contact the tip of the delivery pipe. In this waterproof rubber plug insertion method, the waterproof rubber plug is inserted into the terminal of the insulation coating by inserting the guide pin into the waterproof rubber plug while pushing out the guide pin, and then pulling out the delivery pipe from the waterproof rubber plug. .

(Example) Hereinafter, a method for inserting a waterproof rubber stopper according to the present invention will be explained in detail based on the example illustrated in FIG.

This method uses a waterproof rubber stopper 2, a guide pin 3, a clamper 4, and a delivery pipe 5.

The waterproof rubber stopper 2 has the same shape as the conventional waterproof rubber stopper 12 described above, and has a cylindrical body 2a having a through hole 2c through which the end of the covered electric wire 1 is inserted, and has a plurality of sealing holes on its outer periphery. An annular flange 2b is provided protrudingly.

The guide pin 3 is a cylindrical body with a truncated conical tapered portion 3a formed at its tip.

The clamper 4 is constituted by a pair of semi-cylindrical clampers 4A and 4B, which are formed by dividing a cylinder into upper and lower halves, each having a fitting recess formed on its outer peripheral surface.

The delivery pipe 5 is a long cylindrical body having an insertion cylinder part 5a on the front end side and a grip cylinder part 5b on the rear end side.

Next, the procedure for inserting a waterproof rubber stopper according to the present invention will be explained.

First, as shown in FIG. 1(A), clampers 4A and 4B are fitted around the outer periphery of the waterproof rubber stopper 2 to maintain its shape so that the waterproof rubber stopper 2 does not deform. In this state, waterproof rubber plug 2
Insert the guide pin 3 by inserting the tab portion 3a into the through hole 2c from the rear end side.

Further, a covered electric wire 1 with the end of the insulation coating 1b stripped to expose the core wire 1a is inserted into the delivery pipe 5,
The core wire 1a of the covered electric wire 1 is positioned at the front part of the clamper 4.

Next, as shown in FIG. 1(B), slide the delivery pipe 5 in the direction of the arrow and insert the tip of the insertion tube 5a into the through hole 2C of the waterproof rubber stopper 2 to taper the guide pin 3. A portion is brought close to 3a. In addition, at this time, the delivery pipe 5 is
The robot moves forward while correcting the bending of the covered wire 1 and the fraying of the core wire 1a.

Next, as shown in FIG. 1(C), the clampers 4A, 4
B in the direction of the delivery pipe 5, and insert the clamped waterproof rubber stopper 2 into the outer periphery of the insertion cylinder part 5a of the delivery pipe 5, and insert the guide pin in contact with the tip of the insertion cylinder part 5a. 3, the waterproof rubber stopper 2 is extruded. Thereby, the covered electric wire 1 is inserted until the core wire 1a protrudes from the waterproof rubber stopper 2.

Subsequently, as shown in FIG. 1(D), when the delivery pipe 5 is pulled out in the direction of the arrow, the waterproof rubber stopper 2 is inserted into the end of the insulation coating 1b of the covered electric wire 1.

The operation from the state shown in FIG. 1(D) to the state shown in FIG. 1(A) will be briefly explained as follows.

In the state shown in Figure 1 (D), move the entire unit to the front where the terminal crimping machine is installed (to the right in the drawing), and
B is divided and removed from the outer periphery of the covered electric wire 1, and
A connection terminal is crimped onto the end of the covered electric wire 1. The covered electric wire 1 with a connecting terminal attached to the tip side is fed out to the front of the delivery pipe 5 by a delivery roller (not shown) disposed adjacent to the rear end side of the covered wire 1, and measured by a length measuring machine (not shown). While doing so, the wire is cut by a cutting machine at a place where it has been fed out by a predetermined length, and the insulation coating of the covered wire 1, which will become a new tip portion, is stripped by this cutting. Thereafter, the state shown in FIG. 1(A) is restored, and the work of inserting a new waterproof rubber stopper 2 is started.

〔Effect of the invention〕

As explained above, according to the method of inserting a waterproof rubber stopper into a covered electric wire of the present invention, the covered electric wire does not bend or the core wire pierces, so that the waterproof rubber stopper can be inserted easily and reliably.

[Brief explanation of drawings]

Fig. 1 is a process diagram showing a method of inserting a waterproof rubber stopper according to an embodiment of the present invention, Fig. 2 is a perspective view showing an assembled state of a waterproof connection terminal to which the present invention is applied, and Fig. 3 is an exploded view of the same. FIG. 4 is a plan view of the covered electric wire into which the waterproof rubber stopper is inserted, and FIGS. 5 and 6 are explanatory diagrams showing a conventional method of inserting the waterproof rubber stopper. [Explanation of symbols] 1... Covered wire 1a... Core wire 1b... Insulation coating 2a... Cylindrical body 2C... Through hole 3a... Taper part 4.4A, 4B... Clamper 5... Delivery pipe 5A... Fitting cylinder part 5B...
・Gripping cylinder part 2b...Annular flange 2...Waterproof rubber stopper 3...Guide pin Patent applicant Nippon Tenshi Co., Ltd. Figure 5 Procedural amendment June 21, 1990

Claims (1)

[Claims] In a method of inserting a waterproof rubber plug into the terminal of a covered electric wire whose core wire is exposed by stripping the terminal of the insulation coating,
A guide pin is inserted into the waterproof rubber stopper, and the insulation coating is inserted into the delivery pipe, and the delivery pipe is inserted together with the insulation coating into the waterproof rubber stopper. The guide pin that is in contact with the tip of the pipe is inserted into the waterproof rubber plug while being pushed out, and the waterproof rubber plug is then inserted into the terminal of the insulation coating by pulling out the delivery pipe from the waterproof rubber plug. How to insert a waterproof rubber stopper.