JPH05299149A - Fitting method for rubber plug to electric wire - Google Patents

Abstract

PURPOSE:To fit a rubber plug at the preset position from the end section of an electric wire even if there is a slight difference between the outer diameter of the rubber plug and the size of the electric wire. CONSTITUTION:A rubber plug (b) having a small-diameter section (c) at one end, a large-diameter section (d) at the other end, and an insertion hole (e) at the center is fitted at the tip section of an electric wire (a). A pair of openable needle sections 2, 2 of a fitting jig 1 are inserted into the insertion hole (e) of the rubber plug (b), the end section of the electric wire (a) is inserted while they are opened to expand the hole diameter of the insertion hole (e), the rubber plug (b) is pinched and fixed from the outside, then a pair of needle sections 2, 2 are closed and extracted from the insertion hole (e).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for attaching a rubber plug used for a waterproof connector terminal to an electric wire.

[0002]

2. Description of the Related Art Electric wires used for various kinds of electric wire wiring are exposed to the outside because the end portion of the electric wire is stripped off at the connection portion with a connector or the like to connect to a terminal. Therefore, depending on the place of use or temperature change, wetting or dew condensation may occur, resulting in corrosion or failure due to poor insulation. For this reason, a rubber stopper is provided at the connection between the electric wire and the connector to prevent water droplets from entering.

4 (A) to 4 (C) show a conventional method of attaching a rubber plug to an electric wire (Japanese Patent Laid-Open No. 60-60).
No. 29249). In the figure, a indicates an electric wire, b indicates a rubber plug, and g indicates a mounting jig. The rubber plug b is formed with a small diameter portion c on one side and a large diameter portion d on the other side, has an insertion hole e into which the electric wire a is inserted, and further has a tapered electric wire insertion guide at the large diameter end portion. f is formed so that the electric wire a can be easily inserted. The small diameter portion c of the rubber stopper b is the electric wire a
After being mounted, it is a portion crimped by a crimping piece of a terminal (not shown), and the large-diameter portion d is formed into a double brim-like shape and serves as a portion for waterproofing the gap with the connector. The mounting jig g has a recessed stepped accommodating portion h corresponding to the difference in outer diameter of the rubber plug b, and an insertion hole i communicating with the accommodating portion h.

To attach the rubber stopper b to the tip of the electric wire a,
As shown in FIGS. (A) to (C), the rubber plug b is fitted into the housing portion h of the mounting jig g, and then the wire a is press-fitted into the insertion hole e of the rubber plug b, and finally the wire a with rubber plug a. Can be pulled out from the mounting jig g. The fitting force (friction resistance) between the rubber plug b and the wire a
Is set to be sufficiently larger than those of the rubber plug b and the housing portion h.

In the conventional method, the rubber plug b is once positioned and fixed in the accommodating portion h having a structure utilizing the difference in outer diameter and the electric wire a is pushed in. When the difference in outer diameter of the rubber plug b is small. , There is a possibility that the position may be varied or it may become impossible to mount. In addition, since the housing portion h of the mounting jig g is formed according to the outer diameter of the rubber plug b, it is necessary to prepare a jig for each product number of the rubber plug, which requires time for replacement, resulting in high cost. Become. Further, since the electric wire insertion guide f is provided in the insertion hole e of the rubber plug b, it can be mounted even if the outer diameter of the electric wire a is large or small. Since the outer periphery of b is substantially constrained by the inner wall of the accommodating portion h, the mounting becomes impossible, and the mounting jigs must be arranged for each wire size in the same manner as described above.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and can be carried out even if there are some differences in the outer diameter of the rubber plug and the wire size, and the wire end portion It is an object of the present invention to provide a method capable of attaching a rubber plug at a predetermined position.

[0007]

In order to achieve the above object, in the method of mounting a rubber plug on an electric wire of the present invention, one is formed as a small diameter portion and the other is formed as a large diameter portion, and an insertion hole for the electric wire is formed at the center. A method of mounting a rubber plug having an end on an electric wire, wherein a pair of openable and closable needles of a mounting jig is inserted into the insertion hole of the rubber plug, and the pair of needles are opened to insert the insertion hole. The end of the electric wire is inserted with the hole diameter enlarged, the rubber plug is clamped and fixed from the outside, and then the pair of needles are closed and pulled out from the insertion hole.

[0008]

[Function] Since the insertion hole of the rubber plug is widened by the pair of needles of the mounting jig, it can be applied to electric wires of different sizes, and the rubber plug is engaged with the stopper at the base end of the needle. Since they are locked together at a predetermined position, the electric wire is always attached at a predetermined position.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing the embodiments. FIG. 1 is a schematic side view of an apparatus for carrying out the method of the present invention. In the figure, 1 is a jig for mounting the rubber plug b, which is provided with a pair of openable and closable needle portions 2 and 2, and is provided between a position A shown by a solid line and a position B shown by a virtual line as described later. It is rotatably provided as indicated by an arrow P. Reference numeral 3 is a guide nozzle for delivering the rubber plug b to the mounting jig 1 at the position B. A rubber plug b is intermittently supplied to the guide nozzle 3 one by one by a magazine (not shown), and by blowing pressurized air into the guide nozzle 3, the rubber plug b is transferred to its right end portion. It The nozzle guide 3 is slidably inserted in the nozzle holder 4 on the upper surface of the substrate 5, connected to an air cylinder (not shown), and provided so as to come in contact with and separate from the mounting jig 1 as indicated by an arrow Q. ing.

Reference numeral 6 is a side plate for fixing the substrate 5, and a support 7
It is fixed to one of the mounts 8 of the device. Reference numeral 9 denotes a mounting head of the mounting jig 1, one end of a rotating shaft 10 of which is pivotally attached to a bearing receiver 12 of a head holder 13 via a bearing 11, and the head holder 13 is mounted by another column 14 on a mount. It is fixed to the other of 8. The other end of the rotary shaft 10 penetrates the shaft hole of the gear mounting plate 15, and the gear 16 is fixed to the tip end thereof. 17 is a gear 16
Is a rack that meshes with, the lower surface of which is supported by a roll 18 on a roll support 19 that is juxtaposed with the support 14, and the left end of the rack 17 is connected to a piston rod 21 of an air cylinder 20 that is fixed to the lower surface of the base plate 5. ing.

As shown in FIG. 2, the pair of needle portions 2 and 2 of the mounting jig 1 are projectingly provided at the tips of the forearm portions 23 of the pair of pliers-shaped arm portions 22, and are opposed to each other. The recesses 23a, 23a for escaping the electric wire are formed on the opposing surfaces of the end surfaces 23a, 23b, and the end surface 23b functions as a positioning stopper for the rubber plug b as described later. A compression coil spring 25 is interposed between the rear arm portions 24, 24 of the pair of arm portions 22,
Normally, the needle portions 2 and 2 are closed, and the rear arm portions 24 and 2 are
The needles 2 and 2 are configured to open when a rod (not shown) is fitted between the four. This pair of arms 22, 22
Is pivotally supported in the mounting head 9 by a shaft 26.

Next, a method of mounting the rubber plug by the above device will be described. In FIG. 1, the mounting jig 1 at position A
Is the wire clamp 27.
It coincides with the axis of the electric wire a gripped by. In this state, when the rack 17 is moved to the right by the operation of the air cylinder 20, the mounting head 9 is rotated counterclockwise by the rotation of the gear 16, and the mounting jig 1 is rotated to the position A. .. Therefore, after the tip of the guide nozzle 3 is moved until it comes into contact with the end surface 23b (see FIG. 2) of the mounting jig 1, pressurized air is sent into the guide nozzle 3 and the rubber previously supplied into the nozzle 3 is fed. The stopper b is moved to the right end side as described above. As a result, the rubber stopper b is transferred to the pair of needle portions 2 and 2. After that, the guide nozzle 3 is retracted, and the mounting jig 1 with the rubber plug is returned to the original position A by the operation reverse to the above.

FIGS. 3A to 3C show a step of transferring the above-mentioned rubber plug b to the mounting jig 1. After moving the rubber plug b to the mounting jig 1, while returning to the position A, the needle portions 2 and 2 are opened by the opening / closing mechanism (see FIG. 2), and the insertion hole e corresponds to the outer diameter of the applicable wire a. The hole diameter so that it can be easily inserted.

FIG. 3 (D) shows an insertion hole e formed by the needles 2 and 2.
Shows a state in which is enlarged to a desired hole diameter. In this state, the electric wire clamp 27 (see FIG. 1) is advanced to the rubber wire b side, and the electric wire a is inserted into the insertion hole e by a predetermined length L as shown in (E). Therefore, as shown in (F), the outer circumference of the rubber plug b is clamped and fixed by the rubber plug chuck 28, and the pair of needles 2 and 2 are closed, while the electric wire clamp 27 and the rubber plug chuck are closed as shown in (G). 28 and 28 are simultaneously retracted with respect to the mounting jig 1, and the rubber stopper b and the mounting jig 1 are completely separated. Finally, when the rubber stopper chuck 28 is removed, a product in which the rubber stopper b is attached at a substantially constant position L from the end of the wire a is obtained (H).

As described above, since the insertion hole e of the rubber plug b can be expanded wide and narrow freely within the elastic limit thereof by the pair of needle portions 2 and 2, it is possible to use the same size rubber plug even for different size electric wires. It will be possible. Further, since the jig for restraining the outer circumference of the rubber plug b is not used, the same mounting jig 1 can be applied to rubber plugs of various sizes.

[0016]

As described above, according to the present invention,
Even if there is a slight difference in the outer diameter of the rubber plug or the wire size, it can be carried out without any problems, and the position of the rubber plug attached to the wire is almost constant, so a stable wire with a rubber plug can be manufactured at low cost. Can be manufactured in.

[Brief description of drawings]

1 is a schematic side view of an apparatus for carrying out the method of the invention.

FIG. 2 is an enlarged view of a portion of a rubber plug mounting jig and a guide nozzle of FIG.

3 (A) to (H) are process explanatory views of attaching a rubber plug to an electric wire.

4A to 4C are explanatory views of a conventional rubber plug mounting method.

[Explanation of symbols]

 a electric wire b rubber stopper c small diameter portion d large diameter portion e insertion hole 1 mounting jig 2 needle portion 27 electric wire clamp 28 rubber stopper chuck

Claims (1)

[Claims] 1. A method of mounting a rubber plug having a small-diameter portion on one side and a large-diameter portion on the other side and having an insertion hole for the electric wire at the center at the tip of the electric wire, wherein the rubber plug is attached to the insertion hole. After inserting a pair of openable and closable needles of the jig and opening the pair of needles to expand the diameter of the insertion hole, insert the end of the electric wire, and clamp and fix the rubber plug from the outside. A method of mounting a rubber plug on an electric wire, which comprises pulling out the insertion hole while closing the pair of needle portions.