JPH05328564A - Method and apparatus for finishing end of power supply cord - Google Patents

Abstract

PURPOSE:To improve the stability and safety of the inspection of a power supply cord, by eliminating the generation of the spark of the cord, and to improve the productivity of the cord, by eliminating the loss of the cord and by making the work of the cord easy. CONSTITUTION:A first part of a cord having a specified length is held by a holding means 6. The first part is near the end to be finished. A second part farther from the end than the first part is clamped by a clamping means 7. This clamping means 7 is slid toward the side opposite to the first part while clamping the cord at the second part by the clamping means 5, and the insulator of the cord is made to expand. Thereby, at the end, the end of the conductor of the cord is drawn in by a predetermined distance from the end of the insulator of the cord.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of treating a power cord and a device therefor. The present invention relates to a method of processing a terminal of a power cord that prevents the other end from sparking due to the applied voltage, and an apparatus thereof.

[0002]

2. Description of the Related Art As a power cord with a plug, there is one in which a two-pole plug is formed at one end of a two-core cord and a three-pole plug is formed at one end of a three-core cord by molding or assembling. Among the mold insertion plugs or the assembly insertion plugs, the mold insertion plugs are now becoming the mainstream for safety reasons.

In a mold plug, a cord conductor and a plug terminal are connected to each other and put in a mold, and then an insulating material such as vinyl chloride resin is press-fitted to form a plug body between the cord end and the plug terminal. At this time, the connection portion between the conductor and the plug terminal may be broken or separated due to the press-fitting pressure of the insulating material, and a part of the conductor core wire may be dispersed due to fraying and short-circuited in the plug body, There is a risk that you may get an electric shock when you use it by going out of the plug body. A plug having such a defect needs to be screened out as a defective plug.

The inspection items therefor are as follows. (1) Withstand voltage inspection between terminals Apply a specified voltage between the plug terminals to which the cord is connected in the plug body, and inspect the conductor core wire for fraying that may cause a short circuit between the plug terminals. (2) Continuity and megger (insulation resistance) inspection Measure the insulation resistance between the plug terminals and whether there is a short circuit between the plug terminals to which the cord is connected in the plug body. (3) Withstand voltage inspection of the plug body A predetermined voltage is applied to the outer surface of the plug body to inspect whether the core wire of the cord conductor is protruding to the outer surface of the plug body.

The above-mentioned respective inspections are proposed in Japanese Patent Application No. 53-146303 “Automatic Plug Plug Inspection Device” and Japanese Patent Application No. 55-160000 “Automatic Plug Plug Automatic Inspection Method” filed by the present applicant. ing. The inspection proposed here is a method in which the molded plugs are collected and carried out in a separate step. On the other hand, separately from this, there is a method in which each plug is formed immediately after molding the insertion plug, or taken out from the molding die and put in another inspection die for each molding.

In the above-mentioned inspection items (1) to (3), the applied voltage and time in the withstand voltage inspection between terminals and the withstand voltage inspection of the plug body are specified by the standard with which the plug is compliant. Here, the applied voltage is becoming larger than that in order to shorten the inspection time as much as possible in order to increase the production efficiency. Recently, inspection has been started at a voltage of 3 to 5 KV with an application time of 5 to 10 seconds.

As described above, due to the tendency toward higher voltage, it is necessary to examine the safety of the inspection work and the high insulation property of the inspection device in each withstanding voltage inspection. Particularly, in the withstand voltage inspection between terminals in which a predetermined voltage is applied between the plug terminals of the plug-in plug, the voltage is applied to the cord connected to the plug terminals for a predetermined time.

[0008]

However, according to the conventional method for treating the end of the power cord, the end faces of the insulator and the conductor are the same at the other end of the cord, and in general, the secondary processing of the end is performed by the plug. It is performed after molding. When the withstand voltage test between the terminals is performed in this state, an applied voltage appears at the other end of the cord in which the plug is not molded, and if the distance between the conductors is closer due to crushing of the insulator, etc. Sparks are generated between the two to make them conductive, and an erroneous determination is made as to whether the inspection is possible.

In order to solve this problem, in the two-core parallel cord, a predetermined length is inserted between the insulators to open the V-shape so as to increase the distance between the conductors, the two-core flat cord with an outer cover,
Alternatively, in the three-core cord with jacket, as shown in FIG. 5, the jacket 1 is separated by a predetermined length at the end and each core 2 is bent to increase the distance between the cores 2. Since the cutting of the insulator and the bending of the wire core after peeling the outer cover are done only for the purpose of inspection, the number of inspection man-hours increases and the processing end length is required for the cord, so the inspection is completed. After that, we are taking measures such as cutting. As a result, extra man-hours and loss are increased, productivity is poor, and cost is high. Further, when the bent shape of the wire core returns to the original shape, the effect disappears, and when a plurality of cords are collectively inspected, some cords may generate sparks.

Therefore, it is an object of the present invention to provide a power cord terminal processing method and apparatus capable of performing a stable withstand voltage test without causing a spark and causing no erroneous judgment.

Another object of the present invention is to provide a power cord terminal processing method and apparatus capable of conducting a highly safe withstand voltage test without generating a spark.

It is still another object of the present invention to provide a power cord terminal processing method and a device therefor, which are easy to work and have high productivity without loss of cord.

[0013]

In order to achieve the above object, the present invention provides a cord having a predetermined length, and the cord is provided at a first position near the machined end and a predetermined distance from the non-machined end. Fixed at a second position that does not reach the first position, and by extending the insulator of the cord by sliding in the opposite direction of the first position while keeping the second position fixed, the processed end Provided is a method for treating a power cord end in which a conductor end face is pulled in a predetermined dimension from an insulator end face.

The above-mentioned cord of a predetermined length is prepared by measuring and cutting it on a terminal processing line.

Further, the power cord terminal processing device of the present invention which achieves the above object, is a holding means for holding a first position in the vicinity of a processed end of a cord cut into a predetermined length, and a non-processed end of the cord. A clamp means for clamping a second position that does not reach the first position at a predetermined distance from the section, and a slide means for sliding the clamp means in the length direction of the cord, and the slide means holds the clamp means of the holding means. By sliding in the opposite direction to extend the insulator of the cord, the conductor end face at the processed end is retracted from the insulator end face by a predetermined dimension.

Further, the power cord terminal processing apparatus of the present invention has a measuring means for measuring a cord continuously supplied to prepare a cord of a predetermined length, and a measuring means for measuring a predetermined length. A cutting means for cutting the cut cord is included.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The power cord terminal processing method and apparatus of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a terminal processor used in the first embodiment of the present invention. This terminal processing device has a slide unit 5 for sliding a cord clamp unit described later.
And a cord holding portion 6 that holds one end of the cord 1, and a cord clamp portion 7 that clamps a predetermined portion of the cord 1.

The slide portion 5 is a slide cylinder 15
And a slider 16 that moves back and forth with respect to this.

The cord holding portion 6 is provided in front of the cord clamp portion 7 and is arranged below the cord holding base 19.
And the cord holder 18 with a circular tip that is arranged above it.
have. The cord retainer 18 is directly connected to the cord retainer cylinder 17, and as the cylinder 17 moves up and down, it cooperates with the cord retainer 19 to hold one end of the cord 1. Further, a cord positioning plate 20 which is adjustable in the longitudinal direction is provided on one side of the cord pressing base 19, and the tip of the cord 1a is brought into contact with the cord positioning plate 20 so that the pressing position of the cord pressing 18 and the code positioning plate 20 can be adjusted. The distance L between 20 is adjusted and set.

The cord clamp portion 7 is fixed to the slider 16 of the slide portion 5, and the cord insertion hole 1 is provided in the front and rear.
It has a cord guide plate 13 having 3a and 13b and a clamp plate 12 located approximately in the middle thereof. Clamp plate 1
The cord 2 is directly connected to the cord clamp cylinder 11 and moves following the vertical movement of the cord clamp cylinder 11. A fixed clamp base 14 is provided immediately below the clamp plate 12, and clamps the cord 1 together with the vertically movable clamp plate 12.

Cord holding cylinder 1 of cord holding portion 6
7, cord clamp cylinder 1 of cord clamp part 7
1 is controlled by a regulator or the like (not shown).

The operation will be described below. A cord positioning plate 2 set at a position of a predetermined length L according to the length of the cord 1.
The cord 1 is inserted from the cord guide plate 13 so that the tip 19 of the cord 1 is brought into contact with 0.

After this insertion, the cord clamp cylinder 1
1, and the cord retainer cylinder 17 operate, and the clamp plate 12 and the cord retainer 18 descend. By this descending, the cord 1 is composed of the clamp plate 12 and the clamp base 14,
Further, it is held by the cord retainer 18 and the cord retainer 19.

Next, the slide cylinder 15 operates,
The slider 16 moves backward by a predetermined length indicated by H while the cord clamp portion 7 clamps the cord 1. Due to this backward movement, as shown in FIGS. 2 (a) and 2 (b), the cord holder 1
The tip 1a of the cord 1 held by the cord 9 and the cord retainer 18 receives tension to extend the insulator 2, and the end face of the conductor 3 is retracted by S from the end face of the insulator 2. This is achieved by utilizing the fact that the conductor 3 of the cord 1 and the insulator 2 have different elongations due to tension.

After this, the cord clamp cylinder 11,
The cord pressing cylinder 17 is operated to raise the clamp plate 12 and the cord pressing 18 to release the cord 1, and the slide cylinder 15 returns the slide portion 5 to the original position.

By performing the above operation for each cord 1, the conductor 3 at the end face of the cord 1 can be retracted by a predetermined dimension S from the end face of the insulator 2.

This terminal processing is performed after the plug body is provided.
Alternatively, it may be performed before the plug body is provided, but if it is performed before the plug body is provided, it is necessary to determine which end the treatment has been performed. Therefore, it is preferably performed after the plug body is provided.

In the above embodiment, the cord clamp portion 7 was slid, but the same result can be obtained by fixing the cord clamp portion 7 and sliding the cord holding portion 6 in front of it. Further, as shown in FIG. 3, in the case of a jacketed three-core cable having a jacket 4, the jacket 4 is peeled off, each exposed wire core 2 is held by a cord retainer 18, and the other end of the cord 1 is slid. By doing so, the same result can be obtained.

FIG. 4 shows a terminal processor used in the second embodiment of the present invention. This terminal processor comprises a slide part 5, a cord clamp part 7, a length measuring part 8 and a cutting part 9. The cord holding portion 6 of the first embodiment is replaced with a cutting portion 9, and a measuring length feeding portion 8 is provided between the slide portion 5 and the cord clamp portion 7 and the cutting portion 9.

The scale feed unit 8 includes a pair of scale rolls 21,
The roll 21 has a pulse motor (not shown) attached to its shaft, and a code guide 23 provided on the upper surface thereof. The other roll 22 is a frame 2 that moves up and down by a cylinder or the like (not shown).
4, it moves up and down and separates from or abuts the cord 1 to be measured.

The cutting section 9 includes a cord retainer 18 directly connected to the cord retainer cylinder 17, a cord retainer 19 to which a lower cutting blade 27 is fixed, and a cutter blade directly coupled to a cutter cylinder 25 provided in front of the cord retainer 18. It is composed of 26.

The operation will be described below. The cord 1 is continuously supplied from a cord supply unit (not shown) to the cord guide plate 13, the measuring rolls 21, 22, and the cutting unit 9.

Code 1 is a measuring roll 21 of the measuring feed unit 8.
Then, it is clamped by a measuring scale pressing roll 22 descended by a frame 24 by a cylinder (not shown), and the measuring roll 21 is driven by a pulse motor (not shown) to measure a predetermined length. The cord 1 measured to have a predetermined length is fed forward from the cutting position 9a of the cutting unit 9. The cord 1 sent out has S from the insulator 2 at the tip 1a.
The part of the conductor 3 that has just retracted is already formed.

Next, the cord clamp cylinder 11 of the slide portion 5 is actuated, and the clamp plate 12 and the clamp base 1 are operated.
4, the cord 1 is clamped, and the cord holding cylinder 17 and the cutting cylinder 2 are provided at the cutting portion 9.
5 is operated, the cord 1 is held by the cord retainer 18 and the cord retainer 19, and at the same time, the cutting blade 26 and the cutting lower blade 2
The cord 1 is disconnected by 7.

When the cord 1 is cut, the measuring roll 22
Is lifted by a frame 24 that is lifted by a cylinder or the like, and the measuring roll 22 is separated from the cord 1.

Next, the slider 16 having the cord clamp portion 7 for clamping the cord 1 clamped by the slide cylinder 15 is retracted by a predetermined length. Due to this retreat, the cord presser 18 and the tip 1a of the cord 1 held on the cord presser base 19 receive tension, and this tension causes the cord 1 shown in FIG.
As shown in (a) and (b), the insulator 2 is expanded and the conductor 3 is
The end face of is retracted by S from the end face of the insulator 2.

Next, the cord retainer 18 and the cutting blade 26 are raised, the slide cylinder 15 is operated, and the cord clamp portion 7 is returned to its original position by the slider 16.

Next, the scale pressing roll 22 is lowered, the clamp plate 12 is raised, and the cord 1 is released. The cord cut in this way is, for example, Japanese Patent Publication No. 63-33.
It is clamped on a conveyor such as No. 687 and No. Sho 63-28871, and conveyed to the next process while being intermittently fed. By separately providing an automatic control circuit, the above operations can be sequentially connected and performed.

In the above embodiment, the pressing force of the cord 1 by the clamp plate 12 is the cord 1 by the cord retainer 18.
It is necessary to set the pressing force to be larger than the pressing force, and these pressing forces can be adjusted and set by adjusting the pressure of each cylinder 11, 17 by a regulator. The tension applied to the cord 1 is appropriately selected and set depending on the slide stroke H, the hardness and thickness of the insulator 2, the material, the configuration of the conductor 3, and the like. L adapted to the size of slide stroke H
Set the value to H ≧ L. In the case of using the flat type two-core cord 1 with the jacket shown in FIG. 2, the cord pressing force: 10 kg, the cord clamping force: 20 kg, the slide stroke H: 20 mm, the positioning dimension L: 20 mm, and the insulator extension is set. A dimension S ≧ 21 mm was obtained.

As described above, according to the present invention, preferably, before the plug is provided, one end of the cord constituting the power cord is not provided with the plug.
Since the process of retracting the conductor end face of the cord from the insulator end face for a predetermined length is performed by applying tension to the insulator, (1) it is possible to increase the retracting dimension of the conductor end face of the cord and to reduce variations. You can (2) There is no change in the shape of the cord end. (3) The extended end of the insulator can be applied to the secondary processing after forming the plug. (4) The extension of the insulator can be performed at the same time in the steps of measuring and cutting the cord.

[0042]

As described above, according to the power cord terminal processing method and the apparatus thereof of the present invention, the following effects can be obtained. (1) In the withstand voltage test between the plug terminals of the plug-in plug, a spark is not generated at the cord end, and a stable test can be performed. (2) The safety of the inspection is improved because the spark is eliminated. (3) Code loss is eliminated. (4) Work becomes easier and productivity is improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing a cord processed in the first embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a three-core cord with a jacket applied to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a second embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a conventional code subjected to terminal processing.

[Explanation of symbols]

1 Code 2 Insulator (Wire Core) 3 Conductor 4 Outer Shell 5 Sliding Part 6 Cord Holding Part 7 Code Clamping Part 8 Measuring Feed Part 9 Cutting Part 11 Code Clamp Cylinder 12 Clamp Plate 13 Guide Plate 14 Fixed Clamp Stand 15 Slide Cylinder 16 Slider 17 Code retainer cylinder 18 Code retainer 19 Code retainer 20 Code positioning plate 21, 22
Measuring roll 23 Code guide 24 Frame 25 Cutting cylinder 26 Cutting blade 27 Lower cutting blade

Claims (4)

[Claims] 1. A cord having a predetermined length is prepared, and the cord is fixed at a first position near the machined end and at a second position that does not reach the first position at a predetermined distance from the non-machined end. Then, by sliding the cord insulator in a direction opposite to the first position while keeping the second position fixed, the conductor end face at the machined end is set to a predetermined distance from the insulator end face at the processed end. A method for processing a power cord terminal, which is characterized in that the dimensions are drawn. 2. A cord is measured on a terminal processing line to be cut into a predetermined length, and the cut cord is cut at a predetermined distance from a first position near a processed end and a non-processed end. By fixing at a second position that does not reach the first position and extending the insulation of the cord by sliding in the opposite direction of the first position while keeping the second position fixed. A method for treating the end of a power cord, characterized in that the conductor end face is pulled in from the insulator end face by a predetermined dimension at the processed end portion. 3. A holding means for holding a first position near a processed end of the cord cut into a predetermined length, and a first position which does not reach the first position within a predetermined distance from the non-processed end of the cord. A clamp means for clamping the second position, and a slide means for sliding the clamp means in the length direction of the cord are provided, wherein the slide means slides the clamp means in a direction opposite to the holding means. A power cord terminal processing device, characterized in that the conductor end face is pulled in a predetermined dimension from the insulator end face at the processed end portion by extending the insulator of the cord. 4. A measuring means for measuring a continuously supplied cord, a cutting means for cutting the cord measured to a predetermined length by the measuring means, and the cord cut to a predetermined length. No. 1 near the machined end of
Holding means for holding the position of the cord, clamping means for clamping the second position that does not reach the first position at a predetermined distance from the non-machined end of the cord, and the clamping means in the longitudinal direction of the cord. Sliding means for sliding the clamp means in the opposite direction of the holding means to extend the insulator of the cord, thereby extending the conductor end surface from the insulator end surface at the processed end. A power cord terminal processing device, wherein the power cord terminal processing device is configured to be retracted by a predetermined size.