JPH085844A - Optical fiber cutter - Google Patents

Abstract

PURPOSE:To prevent excessive increasing of a speed at the time of manually advancing a cutting blade, to decrease variation in ways of giving a score and to obtain good cut surfaces by providing the above cutter with an energy absorbing means for absorbing part of the advancing energy of this cutting blade. CONSTITUTION:This cutter is provided with the energy absorbing means 70 as a damper for delaying the advancing speed by partly absorbing the advancing energy of the cutting blade 56. For example, a pneumatic cylinder is utilized for the energy absorbing means 70. Namely, a piston 74 is freely slidably and nearly airtightly fitted to a cylinder tube 72 and one end of a piston rod 76 is fixed to a block 58 of the cutting blade 56. The air in front of the piston 74 is rapidly compressed to resist the movement of the block 58 of the cutting blade 56 when this block 58 is rapidly pushed. As a result, the too fast advance of the cutting blade 56 is prevented and the good score which is a premise of good cutting is given to an optical fiber 380.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber cutting device.

[0002]

2. Description of the Related Art An example of an optical fiber cutting device is shown in FIG. This device is a manual type device disclosed by the present applicant in Japanese Patent Application No. 62-92232 and the like, and is roughly composed of a main body 10, a lid 22, a cassette type cutting blade 56, and a retractable holding member 36.
Consists of On the base 12 of the main body 10, from one end, the clamp bases 14 and 16 and the rectangular parallelepiped set base 1
8 are provided in order. A guide groove 20 is formed on the upper surface of the set table 18. The lid 22 is attached to the main body 10 by a hinge 23 so as to be openable and closable. A clamp retainer 24 and a retainer 26 are provided on the lid 22. Further, a pad 28 corresponding to the magnet 21 of the main body 10 is provided.

Between the bases 14 and 16 on the base 12,
A cutting section 50 having a cutting blade 56 is provided. This will be described later. The rear end of the arm 30 is pinned to the set table 18 and kept substantially horizontal by the spring 32. One end of the arm 34 is pinned to the front end of the arm 30 so that it can be raised and lowered. A pusher 36 is provided at the free end of the arm 34.

A fixing jig 40 is attached to the optical fiber ribbon core wire 38.
Is attached, and the fixing jig is housed in the guide groove 20 of the main body 10. Then, the optical fiber 380 is mounted on the bases 14 and 16. When the lid 22 is closed, the lid 22 presses the fixing jig 40 by the action of the magnet 21 and the pad 28. At the same time, the base 14 and the presser foot 24 and the presser foot 26 of the base 16 are
The optical fiber 380 is clamped and fixed in between. The cutting blade 56 is advanced to scratch the optical fiber 380. The arm 34 is manually tilted, and the optical fiber 380 is pushed by the pushing tool 36 to break it.

Only the cutting portion 50 is shown in FIG. 52 is
For example, a frame having a rectangular dish-shaped cross section in the optical fiber direction can be attached to and detached from the main body 10 in a cassette manner. In use, it is fixed on the base 12 of the main body 10. Pass the two guide bars 54 in the front-back direction,
It guides a block 58 with a circular cutting blade 56. Reference numeral 60 represents a linear bearing. The block 58 is manually advanced to scratch the lower surface of the optical fiber 380 with the cutting blade 56.

[0006]

When cutting an optical fiber, it is necessary that the cut end face angle (generally a right angle, but in some cases an inclined cutting is aimed) is within an allowable range. However, there are cases where the end face angle deviates from the target angle and exceeds the allowable range. Then, as a result of examining the reason, the following was found. When the block 58 of the cutting blade 56 is manually advanced, the forward speed (the cutting blade 56
The speed at which the light hits the optical fiber) varies depending on the operator and also from time to time for the same operator. The relationship between the variation in the end face angle and the forward speed of the cutting blade 56 is shown in FIG.
The higher the forward speed of the cutting blade 56, the greater the variation in the end face angle. Further, if the speed of the cutting blade 56 is too fast, the depth and shape of the scratch on the optical fiber 380 may not be uniform, and the cut surface may not be a clean mirror surface (see Table 1 below).

[0007]

As illustrated in FIG. 1,
An energy absorbing means 70 is provided as a damper for absorbing a part of the forward energy of the cutting blade 56 and slowing the forward speed.

[0008]

[Work]

(1) When moving the cutting blade forward manually, energy
With the absorbing means, the forward speed is suppressed so as not to be too fast, and the impact given by the cutting blade 56 is alleviated. Therefore,
A good cut surface can be obtained. (2) The energy absorbing means (particularly the air damper) for suppressing the forward moving speed has a simple structure, so that it can be easily attached to the existing cutting device and maintenance is easy.

[0009]

EXAMPLE FIG. 1 shows only the cutting section 50. Other parts are the same as in the case of FIG. In this case, energy
The absorbing means 70 uses a pneumatic thin lidar type. That is, the piston 74 is slidably and almost airtightly fitted to the cylinder tube 72 (the piston diameter is determined so that the piston has a breathability such that the piston moves slowly), and the piston rod 76 is fitted. Is fixed to the block 58 of the cutting blade 56.

When the block 58 of the cutting blade 56 is pushed quickly, the air 78 in front of the piston 74 is rapidly compressed, resisting the movement of the block 58. This prevents the cutting blade 56 from advancing too fast, so that the optical fiber can be provided with a good scratch that is a prerequisite for good cutting. Compressed air gradually leaks from the circumference of the piston to the opposite side, and after some time the piston position can maintain the forward position (when fully airtight, the piston returns to its original position against the compression force). Try).

[Regarding Energy Absorbing Means 70] The term "energy absorbing means" is used to mean that a part of the forward energy of the cutting blade 56 can be absorbed, as described above, and the optical fiber collision. The means for mitigating the impact at the time is shown. In other words, part of the forward energy can be converted to another energy to slow the forward speed. Therefore, a conventionally known damper or brake can be used as the energy absorbing means. Also, there are those that are held in a forwarded state and those that are pushed back.

Among the conventionally known dampers, brakes, etc.,
A simple structure using air is shown in FIGS.
It was illustrated in. (A) Check valve 80 on the head side of cylinder tube 72
To provide. The cutting blade 56 can be easily returned. Further, the airtightness between the piston 74 and the cylinder tube 72 may not be strictly maintained. (B) The check valve 80 is provided on the piston 74. The action is the same as (a). (C) The head side and the rod side of the cylinder tube 72 are communicated with each other through a narrow passage 82. You may variably squeeze the way. It is suitable to keep the advancing speed of the cutting blade 56 constant. (D) A passage 82 is provided in the piston 74. The action is the same as (c). All of the above can be used as the energy absorbing means 70.

Next, Table 1 shows the relationship between the advancing speed and the shape of the cut surface.
Shown in

[Table 1] In this table, the sum of the numbers (in the horizontal row) for each cutting speed is 100%. Further, in terms of a defective state, a step means a state in which a step is formed on a cut surface, a spiral means a state in which undulation occurs, and a hackle / mist means a state in which clouding occurs instead of being a mirror surface. The cutting angle of 2 ° or more was regarded as defective. From this evaluation result, it can be evaluated that the blade insertion (advancing) speed has a great influence on the cut surface.

[0014]

【The invention's effect】

(1) Since the energy absorbing means for absorbing a part of the advance energy of the cutting blade is provided, it is possible to prevent the speed from becoming too fast when the cutting blade is manually advanced. As a result, variations in scratching are less likely to occur, and a good cut surface can be obtained. (2) Since the energy absorbing means has a simple structure,
It is easily attached to existing cutting equipment and is easy to maintain.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a main part of an embodiment of the present invention.

FIG. 2 is an explanatory view of a modified example of the energy absorbing means in the present invention.

FIG. 3 is an explanatory view of an example of an optical fiber cutting device (common to the present invention and the prior art).

FIG. 4 is an explanatory view of a conventional cutting section.

FIG. 5 is a diagram showing the relationship between the moving speed of the cutting blade and the variation in the end face angle.

[Explanation of symbols]

 10 cutting device main body 12 base 14, 16 clamp base 18 set base 20 guide groove 21 magnet 22 lid 23 hinge 24, 26 clamp retainer 28 backing plate 30,34 arm 32 spring 36 pusher 38 optical fiber tape core wire 380 light Fiber 40 Fixing jig 50 Cutting part 52 Frame 54 Guide rod 56 Cutting blade 58 Block 60 Linear bearing 70 Energy-absorbing means 72 Cylinder tube 74 Piston 76 Piston rod 78 Air 80 Check valve 82 Passage 84 Spring

Claims (1)

[Claims] 1. A cutting device for an optical fiber comprising a cutting blade which is manually advanced in a direction perpendicular to the optical fiber and scratches the optical fiber during the advance, wherein a part of forward energy of the cutting blade is supplied. An apparatus for cutting an optical fiber, which comprises an energy absorbing means for absorbing.