JPH0529088B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for manufacturing a spacer for holding a transmission medium such as an optical fiber in a communication cable or the like.

<Prior art> In a transmission cable 1 using optical fiber or the like as shown in FIG.
In this method, a large number of helical (or wave-shaped) transmission medium accommodation grooves 4 are continuously formed on the outer periphery of a linear body in which a core material 2 made of steel wire, FRP wire, etc. is thickly coated with thermoreversible resin. The optical fiber 5 is accommodated in the groove 4 and the outer periphery is coated with a sheath 6.
No. 60-243611 and others.

These spacers 3 are manufactured by coating the core material 2 that continuously moves in the axial direction with melted resin in an extruder or the like to form a linear body, and then A method is employed in which a die corresponding to the cross section of the spacer 3 is provided, and the transmission medium accommodation groove 4 is formed on the circumferential surface of the linear body before hardening by rotating or reciprocally rotating the die, and then the groove is cooled and hardened. was.

<Problems to be solved by the invention> However, according to the conventional method as described above, from the moment the groove is formed with a rotating die to the time when cooling starts and the hardening to a certain hardness, the die rotation and Due to the action of torsional force due to the feeding movement of the linear body, the protrusions between the grooves are hardened in the direction of rotation of the die, resulting in poor processing accuracy and hindering the entrainment of the transmission medium in the subsequent process. In addition to this, the defective rate of the product is high due to problems such as problems such as oxidation, and the inspection costs are high due to the use of laser beams for these accuracy inspections.In addition, the inspection has the disadvantage of requiring a long time and a lot of manpower. It was hot.

In addition, when forming a spacer using a die, since it is a fluid resin, the formation itself takes a certain amount of time, and cooling after grooving also requires slow cooling, which lengthens the cooling time. is 10
The problem was that the work efficiency could only be expected to be around mm/min, which, together with the aforementioned processing defects, led to a large increase in overall costs.

<Means for Solving the Problems> The present invention for solving the above-mentioned problems has a structure in which the peripheral surface of the linear body 15 that moves in the axial direction is rotated around the linear body 15. In the method of cutting and forming a spiral or wave-shaped transmission medium accommodation groove 4 continuous in the axial direction by pressing a reciprocating cutter 32, the cutter 32 has a cutting blade on its outer periphery and rotates at high speed. Particularly, the transmission medium accommodating groove 4 is cut and formed on the circumferential surface of the linear body 15 using the cutting blade.

<Function> After the linear body 15 is formed while being fed at a relatively high speed, the transmission medium accommodation groove 4 is cut by the cutters 32, 32'. Because of the cutters 32, 32' rotating at high speed, the heat generated during cutting is small, and the cutting itself is carried out at high speed with a light load and without leaving any internal stress in the linear body 15. Further, the groove cutting process is performed accurately and with high precision according to the shape of the cutting edge of the cutters 32, 32', and furthermore, even after the cutting process, the groove shape is not deformed and is maintained in the state at the time of cutting.

<Example> To explain in detail one embodiment of the present invention shown below, FIG. A core material 2 having a core material 2 is fed out at a constant speed in a straight line from a drum of a feeding machine 11, and around it, a heat-retroactive resin 13 such as melted high-density polyethylene is supplied in a molding machine 12. Then, a linear body 15 having a circular cross section with a core material 2 embedded in the center is sequentially molded and fed out by a molding die 14 in the molding machine 12.

The linear body 15 is drawn out by a feeder 17 on the feeding side of the cooling device 16 so that it passes through a cooling device 16 such as a water-cooled cooling tank and is cooled and hardened. After cooling and hardening, the linear body 15 fed out from the feeder 17 is inserted into a groove cutting device 18 for rough cutting, and passed in a straight line while being pulled out from the next feeder 19.

Inside the groove cutting device 18, a ring-shaped rotating frame 30 as shown in FIGS. 1 and 2 is arranged so as to be coaxial with the linear body 15. Inside the rotating frame 30, a plurality of drives 31 (six in the drawing) consisting of motors etc. are installed at equal angular intervals, and the cutter shaft 33 of each drive machine 31 has a sawtooth cutting blade formed on the circumferential surface. A circular cutter (milling cutter) 32 is pivotally supported. As shown in FIG. 2, each cutter 32 is radially supported so that the tooth tips on its circumferential surface face each other toward the center of the linear body 15. That is, the opposing tooth tips of each cutter 32 are arranged so as to bite into the circumferential surface of the linear body 15 in accordance with the arrangement and shape of the groove 4 to be formed in the linear body 15. Each cutter 32 is rotated at high speed by each drive machine 31 (in the illustrated example, the linear body 1
Rotation in the direction of progress of 5 = rotation)).

On the other hand, a rotating machine 35 consisting of a motor etc. is attached to the frame 34 of the groove cutting device 18, and a small diameter gear 36 is attached to and driven by this rotating machine 35.
is engaged with a gear 37 fixedly provided on the outer periphery of the rotating frame 30. Due to this mechanism, the rotating frame 30 itself also rotates (revolutions) relative to the linear body 15. By such an operation, a spiral groove 4 is roughly cut and formed on the circumferential surface of the linear body.

Next, the linear body 15 is fed into a finishing grooving device 18' having substantially the same configuration as the above-mentioned grooving device 18, which is interposed between the feeder 19 and the next drawer feeder 21, where it is Finish cutting of the groove 4 is performed, and the spacer 3 is completed. The cutter 32' of the finishing groove cutting device 18' is slightly thicker and larger in diameter than the cutter 32 by the amount of finishing cutting allowance, and the spacer 3 that has been finished cutting is sequentially wound on the drum of the winding machine 22. .

Note that the lead pitch of the spiral groove in the above cutting process depends on the feed speed of the linear body 15 and the rotating frame 3.
When the rotating frame 30 is rotated in either direction, it becomes a spiral groove, and when it is alternately rotated in the opposite direction, it forms a spiral groove on the circumferential surface of the linear body 15. A corrugated groove 4 is formed.

When cutting and forming these grooves, cutter 3
If the orientation of the cutters 32, 32' is in the feeding direction (axial direction) of the linear body 15, a misalignment will occur between the orientation of the cutters 32, 32' and the helical lead angle of the groove 4, resulting in a change in the cutter diameter. If this is large, the cross section of the groove 4 may not necessarily correspond to the shape of the cutting edge of the cutters 32, 32'. In order to solve these problems, the cutters 32, 32' and the driver 31 are adjusted by rotating a certain angle with respect to the rotating frame 30 so that the cutters 32, 32' are oriented in the spiral direction of the groove 4. Alternatively, it is also possible to use a mechanism (not shown) that rotates in response to the rotational speed and direction of the rotating frame 30 to correspond to the lead angle.

FIG. 5 shows another embodiment of the groove cutting device 18, in this example a cutter 3 mounted in a rotating frame 30.
2 is a slot cutter, and the cutter shafts 33 protrude from the driving machine 31 in the centripetal direction and rotate at high speed. In this case, depending on the shape of the cutter, in addition to the shape shown in FIG. Groove 4 with a narrow entrance cross section as shown in B and C
It is also possible to form

The embodiments used in the method of the present invention are not limited to the apparatuses according to the above embodiments. For example, the rotational drive mechanism for the revolution or rotation of the rotary frame 30 or the cutter 32 of the groove cutting device 18 etc. may be as shown in the figure. In addition to driving each part with a separate motor, it is also possible to use an interlocking mechanism using a single power source, or to continuously supply cooling fluid or cutting fluid to the cutting part as necessary.

In addition, in the illustrated embodiment, a linear body 15 having a core material 2 at the center has been described, but a spacer without a core material or a tubular linear body may be processed depending on the purpose and material of the spacer. The present invention can also be used in

<Effects of the Invention> According to the method of the present invention configured as described above, since the peripheral surface of the linear body is cut using a cutter that rotates at high speed, the gap between the grooves after machining is caused by internal stress. As a result of no deformation of the protrusions and extremely high processing accuracy, the yield of products is significantly improved, and expensive inspection equipment, costs, and manpower for checking for defective products are significantly reduced.

In addition, unlike conventional retroactive machining, the grooving process on the linear object itself is performed in a short time, so the feeding speed of the linear object can be increased several times compared to conventional processing, which greatly increases the overall speed. This has the advantage of realizing significant cost reductions.

[Brief explanation of the drawing]

The drawings show the apparatus used to carry out the invention, the first
2 and 2 are a front sectional view and a side sectional view of the main parts of the above device, FIG. 3 is a device layout diagram of a spacer production line, and FIG. 4 is an enlarged perspective view showing an example of the structure of a transmission cable, FIG. 5 is a side sectional view of a main part showing another example of the implementation device, and FIG. 6 is a sectional view showing an example of the shape of the transmission medium accommodating groove of the spacer. DESCRIPTION OF SYMBOLS 1... Cable, 2... Core material, 3... Spacer, 4... Groove, 5... Optical fiber, 12... Molding machine, 15... Linear body, 18, 18'... Grooving device, 32, 32'... cutter.

[Claims]

1. A holding device for a lens having a convex surface, which is configured such that the lens having a convex surface is brought into contact with a lens receiving portion provided on the inner circumferential surface of a lens barrel and is fixedly held on the lens barrel via an adhesive. A width in the optical axis direction is applied to a part of the inner peripheral surface of the lens barrel that is within 1/2 of the width in the optical axis direction of the lens outer peripheral surface from the outer peripheral edge of the convex lens surface side located close to the lens receiver side. is 5
mm or less, a ring-shaped lens holding part is provided protruding in a direction perpendicular to the optical axis of the lens, and an adhesive part is formed between the inner circumferential surface of this lens holding part and the outer circumferential surface of the lens. A holding device for a lens having a convex surface, characterized in that: