JPH0453602Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a melt crimping device used for processing the end of an optical fiber.

[Conventional technology]

Optical fiber cord (hereinafter referred to as optical cord)
As one method for attaching the ferrule to the tip of the ferrule, as shown in FIG.
is inserted so that its core 2a protrudes forward by a predetermined length, and the ferrule is fixed to the optical cord by caulking or the like.Then, the protruding core tip is heated and processed to transform it so as to fill the recess 1a. There is a method in which the ferrule is prevented from coming off, and in some cases, the tip of the core is simultaneously formed into a convex curved surface to create a lens effect.

The conventional melt caulking equipment used in this method is
As shown in FIG. 3, an optical cord end holder 4 with a chucking mechanism for the ferrule 1 is provided above the hot plate 3, and this holder is raised and lowered by a cylinder actuator 5 or the like to remove the protruding core end during processing. Generally, it is pressed against the molding surface of the hot plate 3.

[Problem that the invention attempts to solve]

However, with the above device, productivity cannot be improved if the heater source of the hot plate is turned off every time the hot plate is crimped and the holder 4 is raised after waiting for the hot plate to cool down. The holder has to be lifted up before it hardens, causing the molten fibers to become stringy and the surface roughness of the molded surface to deteriorate. There was a problem that it became necessary to incorporate it, which increased the effort and cost.

This invention aims to eliminate the above-mentioned problems without reducing productivity.

[Means for solving problems]

In order to achieve the above-mentioned purpose, this invention allows a holder with a chucking mechanism and a hot plate to approach and separate from each other relatively, and when they approach, the core end of the optical cord supported by the holder is pressed against the molded surface of the hot plate. In the optical fiber melting and caulking device, the forming surface of the hot plate is provided on a heat transfer body that has a sufficiently small heat capacity with respect to the hot plate, and that allows the holder and the hot plate to move in the direction toward and away from each other by a driving means. Furthermore, the hot plate is provided with a recess that tightly receives the heat transfer body.

[Effect]

In this device, the heat transfer body with the molding surface at the core end is independent from the heating plate, so by pulling the heat transfer body away from the heating plate, the molten core end remains in close contact with the molding surface. It can be cooled, and the surface roughness of the core end can be increased by the cooling.

In addition, since the heat capacity of the heat transfer body is sufficiently smaller than that of the hot plate, heating occurs quickly when it comes into contact with the hot plate, and cooling occurs quickly when separated from the hot plate. Deterioration in work efficiency can also be kept to a small level.

〔Example〕

FIG. 1 shows an example of the melting caulking device of this invention.

As shown in the figure, a hot plate 13 is provided on the base plate 10 and is placed and held on a heat insulating material 12 attached to a spacer 11. The hot plate 13 has a built-in heater (not shown) and is heated by turning on the heater source, and has a recess 14 at an appropriate position on the top surface.

Further, above the hot plate 13, a heat transfer body 15 is provided, which has a molded part 15a with a molded surface A, and the molded part is inserted into the recess 14 in a substantially intimate state. This heat transfer body 15 has a very small heat capacity compared to the heat plate 13, and the stand 1
Connect the rod of cylinder 17 attached to 6,
The propulsive force of the rod causes it to move up and down within a predetermined stroke range. Reference numeral 18 denotes a movement guide such as a slide rail, which is provided as necessary to improve the straightness of the heat transfer body 15, and 19 is a buffer cylinder which also functions as a movement guide, which is also provided as necessary.

Directly above the molding surface of the heat transfer body 15, a holder 20 for the end of the optical cord is further provided. This holder has substantially the same structure as that used in the apparatus shown in FIG. 3, and includes a chucking mechanism for a ferrule attached to the end of the optical cord. Further, a rod of a cylinder 22 attached to the stand 16 via a bracket 21 is connected to the holder 20, and the holder 20 is moved up and down by driving the cylinder 22. 23 is a buffer cylinder that also serves as a movement guide for the holder 20, and like the cylinder 19, this is also provided as necessary.

The illustrative apparatus constructed as described above lowers the heat transfer body 15 that has been separated in advance and fits it snugly into the recess 14 of the hot plate 13, transmits the heat of the hot plate to the heat transfer body, and transfers the heat from the hot plate to the forming surface A.
heat up. The recess 14 is provided in order to ensure a larger heat transfer area at this time and to hasten the heating time of the heat transfer body to a predetermined temperature.

Next, when the heat transfer body 15 reaches a predetermined temperature, the holder 20 is lowered and the optical cord 2 supported by the holder 20 is lowered.
The end of the core 2a is pressed against the molding surface A, and after being heated and melted, it is crushed and molded into the desired shape. The end face of the core 2a at this time will be flat if the molding surface A is made flat, or will be a convex curved surface that produces a lens effect if the molding surface A is a concave curved surface.

After that, when the heat transfer body 15 and the holder 20 are simultaneously raised at the same speed, the heat transfer body 15 is cooled by the atmosphere, and the core end face in contact with the molding surface A is also cooled and solidified, and after a predetermined period of time (several to several When the heat transfer body is lowered and separated from the holder after 10 seconds (may be 10 seconds), the core end is successfully peeled off from the molding surface A, and a molding surface with good properties that does not require post-processing can be obtained.

Note that since the descended heat transfer body is stored in the recess of the hot plate as it is and is quickly heated, no time loss occurs in the work.

〔effect〕

As described above, according to this invention, the hot molding surface of the core end is formed into a heat transfer body independent from the hot plate, and the core end after melting and caulking is cooled while remaining in close contact with the molding surface. Also, the heat transfer body is
The heat capacity has been made sufficiently smaller than that of a hot plate, and the hot plate has a recess that expands the heat transfer area so that the heat transfer body can be heated and cooled quickly, without increasing processing time. In addition, it is possible to perform high-precision melt caulking without the need for post-processing, which has the effect of greatly contributing to improved productivity and stabilization of product quality.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of the melting crimping device of this invention, Fig. 2 is a sectional view showing an example of the processing structure of the optical cord terminal portion, and Fig. 3 is a schematic configuration of a conventional melting crimping device. It is a front view. 10... Base plate, 13... Heat plate, 14... Recess, 15... Heat transfer body, 17... Cylinder, 20...
...Holder at the end of the optical cord, 22...Cylinder, A...
...molding surface.

Claims (1)

[Claims for Utility Model Registration] (1) A light that causes a holder with a chucking mechanism and a hot plate to approach and separate from each other relatively, and presses the core end of an optical cord supported by the holder against the molded surface of the hot plate when they approach each other. In the fiber melting and caulking device, the forming surface of the hot plate is provided on a heat transfer body that has a sufficiently small heat capacity with respect to the hot plate and that allows the holder and the hot plate to move in a direction toward and away from each other by a driving means, Furthermore, an apparatus for melting and caulking an optical fiber end, characterized in that the hot plate is provided with a recess for receiving the transmitting body in a close state. (2) The optical fiber end melting and caulking device according to claim (1), wherein the heat transfer body includes a moving guide. (3) Claim (1) of the utility model registration is characterized in that the heating plate is fixed and the holder is supported in a movable state. .