CN210982803U

CN210982803U - Cutting device

Info

Publication number: CN210982803U
Application number: CN201922181428.1U
Authority: CN
Inventors: 森健二
Original assignee: Furukawa Electric Co Ltd
Current assignee: Furukawa Electric Co Ltd
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2020-07-10
Anticipated expiration: 2029-12-09

Abstract

The utility model provides a cutting device, it is even under the eccentric condition of the rotation axis of blade spare, also can cut off optic fibre under invariable condition. The cutting device cuts an optical fiber and is provided with: a base part (17); a disc-shaped blade member (19); a positioning member (25) which is provided on the base (17) and has a positioning section (25a) that regulates the position of the blade member (19); a support section (21) which is arranged so that the height thereof can be changed with respect to the base section (17) and which supports the blade member (19); and an elastic member (33) that presses the support portion (21) in the direction of the positioning portion (25a), wherein the positioning member (25) has a slit (23), a part of the blade member (19) is inserted from the back side of the slit (23), both sides of the blade portion of the blade member (19) contact the inner edge portion of the slit (23), and the tip of the blade member (19) protrudes toward the surface side of the slit (23).

Description

Cutting device

Technical Field

The utility model relates to a cutting device for cutting off optical fibers.

Background

Conventionally, when an optical fiber is fusion spliced, a coating of an optical fiber core wire is first removed, and then the optical fiber is cut into a predetermined size. As a cutting device for cutting an optical fiber, there is a device in which: the coating of the optical fiber core wire is removed to expose the glass fiber portion, and a disk-shaped blade member is brought into contact with the glass fiber portion to damage the surface, and then cut.

However, the cutting device described above may be as follows: the blade member is repeatedly brought into contact with the optical fiber to deteriorate. Therefore, the following cutting device is proposed: the contact position with the optical fiber is updated by rotating the blade member during the cutting operation.

As such a cutting device, there is also a device as follows: for example, the contact position with the optical fiber is updated by rotating the blade member in conjunction with the movement of the disk-shaped blade member during the cutting operation (see, for example, patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2008-203815

SUMMERY OF THE UTILITY MODEL

Problem to be solved by utility model

However, if the rotation axis of the circular blade member is located entirely at the center of the blade member, the position of the blade member does not change even if the blade member rotates. Therefore, even when the blade member is rotated and used, the relative relationship between the blade member and the optical fiber can be always kept constant, and constant damage can be applied to the optical fiber.

However, there are cases where: the rotation axis of the blade member is displaced from the center and becomes eccentric due to reasons such as manufacturing accuracy of the blade member. In this case, when the blade member is used by being rotated, the position of the blade member changes due to the rotation of the blade member. Therefore, the depth of damage to the optical fiber changes. If the depth of the damage is changed in this way, it becomes difficult to cut the optical fiber with high accuracy, and the quality of the cut optical fiber deteriorates.

Means for solving the problems

The present invention has been made in view of the above problems, and an object of the present invention is to provide a cutting device capable of cutting an optical fiber under a constant condition even when a rotation axis of a blade member is eccentric.

In order to achieve the above object, the present invention provides a cutting device for cutting an optical fiber, comprising: a base part; a disc-shaped blade member; a positioning member provided on the base portion and having a positioning portion for regulating the position of the blade member; a support portion that is disposed so as to be variable in height relative to the base portion and supports the blade member; and an elastic member that presses the support portion in a direction of the positioning portion, wherein the positioning member has a slit, a part of the blade member is inserted from a back side of the slit, both sides of the blade portion of the blade member are in contact with an inner edge portion of the slit, and a tip of the blade member protrudes to a front side of the slit.

The cutting device may further include an adjusting portion that can adjust a height of the positioning portion with respect to the base portion.

The cutting device may further include a rotating portion that rotates the blade member and changes a circumferential position of the blade member protruding from the slit.

Effect of the utility model

According to the utility model discloses, can provide following cutting device: the optical fiber can be cut under a constant condition even when the rotation axis of the blade member is eccentric.

Drawings

Fig. 1 is a perspective view showing a cutting device 1.

Fig. 2(a) is a plan view of the cutting unit 9, and fig. 2(b) is a front view of the cutting unit 9.

Fig. 3 is a rear view of the cutting unit 9.

Fig. 4(a) is a sectional view taken along line B-B in fig. 3, and fig. 4(B) is an enlarged view of portion F in fig. 4 (a).

Fig. 5(a) and 5(b) are diagrams showing the cutting operation of the cutting unit 9.

Fig. 6 is a diagram showing another embodiment of the cutting unit 9.

Description of reference numerals:

1: cutting device

3: main body part

5: cover part

7: support placing part

9: cutting unit

11: rod

13: pressing part

15: guide rail

17: base part

19: blade member

21: supporting part

23: slit

25: positioning member

25 a: positioning part

27: height adjusting part

29: rotating part

31: pin

33: elastic component

35: optical fiber

37: sliding block

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings. Fig. 1 is a perspective view showing a cutting device 1. The cutting device 1 mainly includes: a body portion 3, a lid portion 5, a cutting unit 9, a lever 11, and the like. The cutting device 1 is a device for cutting an optical fiber at a predetermined position.

A holder placing portion 7 is formed on the upper surface of the main body portion 3. A holder for holding an optical fiber is placed on the holder placing unit 7. The glass fiber portion exposed by removing the coating of the optical fiber core wire protrudes from the end portion of the holder. When the holder is placed on the holder placement portion, the optical fiber is placed so as to straddle the cutting unit 9. When the lid 5 is closed in this state, the optical fiber is pressed and held by the pressing portion 13.

When the lever 11 is further operated, the blade member of the cutting unit 9 slides (in the direction of arrow a in the figure), and the optical fiber is damaged, and the damaged portion is subjected to bending stress, whereby the optical fiber can be cut.

Next, the cutting means 9 will be explained. Fig. 2(a) is a plan view of the cutting unit 9, fig. 2(b) is a front view of the cutting unit 9, and fig. 3 is a rear view of the cutting unit 9. The cutting unit 9 is composed of the guide rail 15, the base portion 17, the supporting portion 21, the blade member 19, the elastic member 33, the positioning member 25, and the like.

A guide rail 15 is fixed to the base portion 17. The guide rail 15 is slidable with respect to a slider not shown. A positioning member 25 is provided on the upper portion of the base portion 17. A slit 23 is formed in the upper portion of the positioning member 25. The inner edge portion of the slit 23 serves as a positioning portion 25a for regulating the position of the blade member 19. A method of positioning the blade member 19 by the positioning portion 25a will be described in detail later.

The support portion 21 is attached to the positioning member 25. One end of the support portion 21 is fixed to the positioning member 25 by a pin 31. The support portion 21 is rotatable about the pin 31 with respect to the positioning member 25. The height of the support portion 21 is changed by rotating one end of the support portion 21 with respect to the positioning member 25. That is, the support portion 21 is arranged to be variable in height with respect to the base portion 17.

The base portion 17 is provided with an elastic member 33 for pressing the support portion 21 upward. That is, the support portion 21 is pressed by the elastic member 33 in the direction of the positioning portion 25a above the positioning member 25.

A disc-shaped blade member 19 is rotatably attached to the support portion 21. By rotating the rotating portion 29, the blade member 19 can be rotated. Therefore, the circumferential position of the blade member 19 protruding from the slit 23 can be changed by the rotating portion 29. Therefore, the circumferential position of the blade member 19 in contact with the optical fiber can be changed.

Next, a method of positioning the blade member 19 will be described in detail. Fig. 4(a) is a sectional view taken along line B-B in fig. 3, and fig. 4(B) is an enlarged view of portion F in fig. 4 (a). As described above, the blade member 19 is attached to the support portion 21. The support portion 21 is constantly pressed against the positioning portion 25a by the elastic member 33.

As shown in fig. 4(b), the blade member 19 is in contact with the slit 23. More specifically, tapered portions are formed on both sides of the blade portion of the blade member 19, and the tapered portions on both sides of the blade portion contact the positioning portions 25a of the inner edge portion of the slit 23. That is, a part of the blade member 19 is inserted from the back side of the slit 23, both sides of the blade member 19 are in contact with the inner edge portion of the slit 23, and the tip of the blade member 19 protrudes to the front side of the slit 23. Further, the inner surface of the slit 23 is tapered corresponding to the tapered shape of the blade tip of the blade member 19.

As described above, the blade member 19 is disk-shaped and can change the circumferential position of contact with the optical fiber 35. That is, the blade member 19 is rotated and used. At this time, if the length (D in fig. 4 a) from the rotation center of the blade member 19 to the blade edge is completely constant in the circumferential direction, the position of the blade edge does not change even if the blade member 19 rotates. On the other hand, if the rotation axis of the blade member 19 is slightly eccentric, the distance from the rotation center of the blade member 19 to the blade edge changes by rotating the blade member 19.

In contrast, in the present invention, the blade member 19 is positioned near the distal end by contacting the inner edge of the slit 23. Therefore, the blade member 19 is position-restricted by the positioning portion 25a so that the length (C in fig. 4 (a)) of the blade tip of the blade member 19 protruding from the slit 23 is substantially constant.

In this way, since the amount of projection of the blade edge of the blade member 19 from the slit 23 is constant, the distance from the base portion 17 to the blade edge of the blade member 19 (E in fig. 4 a) can be made substantially constant regardless of the eccentricity of the blade member 19. The amount of eccentricity of the blade member 19 can be absorbed by the height change of the support portion 21.

Further, the position of the blade member 19 can be made constant as long as the maximum amount of change in the distance from the base portion 17 to the blade edge of the blade member 19 when the blade member 19 is rotated due to the eccentricity of the blade member 19 is of a degree (for example, 2mm or less) that can be absorbed by the contraction of the elastic member 33. The present invention is particularly effective when the maximum amount of change in the eccentricity of the blade member 19 is 2 μm or more in the distance from the base portion 17 to the edge of the blade member 19 when the blade member 19 is rotated.

Next, a method of cutting the optical fiber will be described. Fig. 5 is a diagram showing a positional relationship between the cutting unit 9 and the optical fiber 35. The guide rail 15 is held by the slider 37. The guide rail 15 and the slider 37 can slide relative to each other.

As described above, the optical fiber 35 is held by the holder (not shown), and the optical fiber protruding from the end face of the holder is held by being pressed by the pressing portion 13 (see fig. 1). From this state, when the cutting unit 9 is relatively slid with respect to the optical fiber 35 (arrow G in the figure) as shown in fig. 5 b, the tip of the blade member 19 protruding from the tip of the positioning portion 25 comes into contact with the optical fiber 35. In this case, the optical fiber 35 can be damaged to a predetermined depth.

At this time, since the height from the base portion 17 to the blade edge of the blade member 19 is always constant as described above, the optical fiber 35 can be always damaged to a constant depth regardless of the circumferential position of the blade member 19. Therefore, by applying a bending stress to the damaged optical fiber thereafter, a high-quality cut surface of the optical fiber 35 can be stably obtained.

Further, the height of the positioning member 25 can be adjusted to adjust the front end position of the blade member 19. The height adjusting portion 27 is screwed into an elongated hole provided in the positioning member 25, and the height of the positioning member 25 with respect to the base portion 17 can be finely adjusted by adjusting the screw-fixing position. Therefore, the position of the tip of the blade member 19 can be finely adjusted with respect to the base portion 17.

The height of the positioning member 25 relative to the base portion 17 may be adjusted by other methods.

As shown in fig. 4(b), the positioning portion 25a may not have a tapered shape of the blade edge of the blade member 19. For example, as shown in fig. 6, the slit 23 may be formed parallel to the radial direction of the blade member 19. In this case, the inner edge portion of the slit 23 comes into point contact with the blade member 19. In either case, the blade edge of the blade member 19 can be positioned by bringing tapered portions on both sides of the blade edge of the blade member 19 into contact with the inner edge portion of the slit 23.

As described above, according to the present embodiment, by providing the elastic member 33 that presses the blade member 19 against the positioning portion 25a that regulates the height of the blade member 19, the height of the tip of the blade member 19 protruding toward the front surface side of the slit 23 can be made constant even when the rotation axis of the blade member 19 is eccentric. That is, the positional relationship between the optical fiber 35 and the blade of the blade member 19 can be maintained constant.

Therefore, the optical fiber 35 can be always damaged under a constant condition. This can suppress the occurrence of variation in the shape of the cut surface of the optical fiber 35 and cutting defects due to variation in the depth of the flaw. Therefore, the cutting quality of the optical fiber 35 can be improved.

Further, since the machining accuracy of the rotation axis of the blade member 19 may be slightly poor, the blade member 19 can be easily manufactured, and the machining cost of the blade member 19 can be suppressed.

Further, since the height of the positioning member 25 can be adjusted, the position of the tip of the blade member 19 can be finely adjusted.

Further, by providing the rotating portion 29 for rotating the blade member 19, the blade member 19 can be easily rotated.

The embodiments of the present invention have been described above with reference to the drawings, but the technical scope of the present invention is not limited to the above embodiments. It should be understood that various modifications and alterations can be made by those skilled in the art within the scope of the technical idea described in the claims, and these also naturally fall within the technical scope of the present invention.

For example, the arrangement of the elastic member 33, the structure of the support portion 21, and the like are not limited to the illustrated examples as long as the blade member 19 can be pressed against the positioning portion 25 a.

The rotation of the blade member 19 and the rotation of the rotating unit 29 may be performed manually or automatically. For example, when the base portion 17 is reciprocated and slid with respect to the slider 37, the blade member 19 may be rotated in conjunction with the movement of the base portion 17.

Claims

1. A cutting device that cuts an optical fiber, comprising:

a base part;

a disc-shaped blade member;

a positioning member provided on the base portion and having a positioning portion for regulating the position of the blade member;

a support portion that is disposed so as to be variable in height relative to the base portion and supports the blade member; and

an elastic member that presses the support portion in a direction of the positioning portion,

the positioning member has a slit, a part of the blade member is inserted from the back side of the slit, both sides of the blade portion of the blade member are in contact with the inner edge portion of the slit, and the tip of the blade member protrudes to the front side of the slit.

2. The shut-off device of claim 1,

the cutting device is provided with an adjusting part which can adjust the height of the positioning component relative to the base part.

3. The shut-off device according to claim 1 or 2,

the cutting device includes a rotating portion that rotates the blade member and changes a circumferential position of the blade member protruding from the slit.