WO2011092745A1

WO2011092745A1 - Constant velocity reciprocating linear movement device and optical fiber polishing apparatus

Info

Publication number: WO2011092745A1
Application number: PCT/JP2010/000545
Authority: WO
Inventors: 杉田尚樹; 安東和俊; 木村敏典
Original assignee: エヌ・ティ・ティ・アドバンステクノロジ株式会社
Priority date: 2010-01-29
Filing date: 2010-01-29
Publication date: 2011-08-04

Abstract

A reciprocating linear movement device is equipped with a slider drive means (17) which assures the reciprocating movement of a slider (16) which can move along the guide surface (15a) of a guide member (15) having a guide surface (15a) which extends in a first direction. This slider drive means (17) comprises: a drive motor (49); a rotating member (51) which is driven by this drive motor (49) about an axis that intersects with the first direction; an eccentric pin (52) which is provided in a protruding manner to the rotating member (51) parallel to the axis of rotation of this rotating member (51); and a guide groove (53) with which the eccentric pin (52) can slidingly engage, and which is formed on the slider (16) in such a manner so as to extend in a first direction and a second direction which intersects with the axis of rotation of the rotating member (51). The reciprocating linear movement device of the present invention is equipped with a means (58) for controlling the speed of rotation of the rotating member (51) in such a manner that the linear velocity of the slider (16) in the first direction is constant, apart from at the ends of the reciprocal movement.

Description

Constant velocity reciprocating linear motion device and optical fiber polishing device

The present invention relates to a device that converts a rotational motion into a constant velocity reciprocating linear motion, and is particularly suitable for being incorporated in a device for polishing a connection end face of an optical fiber.

An optical connector used to connect a plurality of optical fibers to each other or connect optical fibers to various optical devices usually has an optical fiber plug through which the optical fiber is inserted. A conventional optical fiber plug is obtained by processing a low expansion coefficient material having excellent wear resistance such as zirconia ceramics into a cylindrical shape. The front end surface of the optical fiber is exposed at the center of the connection end surface of the optical fiber plug. The connection end surface is formed as a convex spherical surface having a radius of curvature of about 20 mm.

A polishing apparatus for processing a connection end face of such an optical fiber plug into a convex spherical surface having a predetermined curvature has been proposed in Patent Document 1. This polishing apparatus has a polishing board in which an abrasive film is stuck on a flat surface via an elastic sheet, and a slider to which an optical fiber plug is attached, and these are moved relative to each other to polish the connection end face of the optical fiber plug. . In this case, the polishing disk revolves around an axis perpendicular to the surface thereof, the slider reciprocates linearly along the surface of the polishing disk, and the connection end face of the optical fiber plug is pressed against the polishing film.

Japanese Patent No. 37773851

In the conventional polishing apparatus disclosed in Patent Document 1, when the slider is reciprocated linearly, the longitudinal movement speed greatly changes at the reciprocating end. More specifically, since the moving speed of the slider changes in accordance with the sine waveform, the portion of the polishing film that contacts the connection end surface of the optical fiber near the reciprocating end of the slider is consumed more violently than the other portions. As a result, the entire surface of the polishing film cannot be effectively used to the maximum, and the polishing film must be frequently replaced, increasing the polishing cost.

An object of the present invention is to provide a constant velocity reciprocating device that keeps the reciprocating velocity of a slider constant.

Another object of the present invention is to provide a polishing apparatus in which the entire surface of the polishing film can be used more effectively than a conventional polishing apparatus by incorporating such a constant velocity reciprocating device.

According to a first aspect of the present invention, there is provided slider driving means for reciprocating a slider which is attached to a guide member having a guide surface extending in the first direction and which is movable along the guide surface of the guide member. The slider driving means includes a driving motor, a rotating member driven and rotated about an axis orthogonal to the first direction by the driving motor, and a position parallel to the rotating axis of the rotating member and away from the rotating member. And an eccentric pin projecting from the rotating member, and the slider extending so as to extend in the first direction and a second direction orthogonal to the rotation axis of the rotating member. A reciprocating linear motion device having a guide groove that is movably fitted so that the linear moving speed of the slider along the first direction is constant except for its reciprocating end. It is characterized in that comprises a rotational speed control means for controlling the rotational speed of the rotary member.

In the present invention, the rotary member is rotated together with the eccentric pin protruding from the rotary member by the operation of the drive motor, and the slider having the guide groove into which the eccentric pin is fitted moves in the first direction along the guide surface. Perform reciprocating linear motion. In this case, the rotational speed control means controls the rotational speed of the rotating member, that is, the rotational speed of the drive motor so that the linear moving speed of the slider along the first direction is constant except for the reciprocating end.

In the constant velocity reciprocating motion device according to the first aspect of the present invention, any one of the reciprocating ends of the slider is set as a reference position, the time from the reference position is t, the moving speed of the slider is c, and the eccentric pin is When the amount of eccentricity and the rotation angle from the reference position and its angular velocity are represented by s and θ and θ (t), the rotational speed control means is configured so that the angular velocity θ (t) of the eccentric pin is expressed by the following equation: 0 ≦ θ ≦ π , Θ (t) = cos ⁻¹ {1- (t · c / s)}
When π ≦ θ ≦ 2π, θ (t) = cos ⁻¹ {(t · c / s) −3}
The rotational speed of the rotating member may be controlled so as to satisfy the above.

The drive motor is a pulse motor, and the rotational speed control means includes a position detection means for detecting the reference position of the slider along the first direction, and a point from when the position detection means detects the reference position of the slider. Timer for counting time, setting means for setting the target rotation speed of the rotating member according to the count value by this timer, and driving for driving the pulse motor in accordance with the target rotation speed set by this setting means A drive pulse setting unit that sets a pulse and a motor driver that outputs the drive pulse set by the drive pulse setting unit to a drive motor may be included.

According to a second aspect of the present invention, there is provided a base, a polishing disc support member provided on the base, a polishing disc mounted so as to be movable with respect to the polishing disc support member, and the polishing disc supporting the polishing disc. A polishing disk turning means for turning the member, a guide member provided on the base, a slider attached to the guide member and capable of reciprocating linear movement along the guide member, and the slider as the guide member And a plurality of fiber holding portions for removably holding a connection end portion of an optical fiber that is coupled to the slider and pressed against the polishing surface of the polishing disk. A plurality of fiber holders arranged in a direction intersecting with the reciprocating linear movement direction of the slider, and a slider. In an optical fiber polishing apparatus characterized by driving means is a first constant-velocity reciprocal linear motion apparatus according to the present invention.

In the present invention, the polishing disk revolves with respect to the polishing disk support member by the polishing disk rotation means. Further, the fiber holder reciprocates linearly along the guide member by the slider driving means. As a result, relative movement occurs between the connection end of the optical fiber held by the fiber holder of the fiber holder and the polishing surface of the polishing disk, and the connection end of the optical fiber is polished. In this case, the reciprocating linear motion of the slider is constant except for its reciprocating end, and local abrasion of the polishing surface of the polishing disk against which the connecting end of the optical fiber is pressed in the vicinity of the reciprocating end of the slider is suppressed. .

In the optical fiber polishing apparatus according to the second embodiment of the present invention, the polishing surface of the polishing disk may be formed by the surface of a substantially square polishing film that is detachably attached to the polishing disk.

According to the constant velocity motion device of the present invention, the rotational speed control means for controlling the rotational speed of the rotating member is provided so that the linear moving speed of the slider along the first direction is constant except for the reciprocating end. Therefore, the linear moving speed of the slider along the first direction can be made constant except for its reciprocating end.

When the rotation angle θ of the eccentric pin from the reference position is 0 ≦ θ ≦ π, the angular velocity θ (t) of the eccentric pin is θ (t) = cos ⁻¹ {1- (t · c / s)} and π ≦ When the rotational speed of the rotating member is controlled so that θ (t) = cos ⁻¹ {(t · c / s) −3} is satisfied when θ ≦ 2π, the straight line of the slider along the first direction The moving speed can be made constant except for the reciprocating end.

When the rotation speed control means has a position detection means, a timer, a setting means for setting a target rotation speed of the rotating member, a drive pulse setting unit for setting a drive pulse for driving the pulse motor, and a motor driver The drive control of the pulse motor can be easily performed without incorporating a complicated control system.

According to the optical fiber polishing apparatus of the present invention, since the slider driving means is the constant velocity reciprocating linear motion apparatus according to the first embodiment of the present invention, the progress of local wear on the polishing surface of the polishing disk can be suppressed.

When the polishing surface of the polishing disk is formed by the surface of an approximately square polishing film that is detachably attached to the polishing disk, the polishing film can be worn almost uniformly over the entire area. , Can extend its life.

FIG. 1 is a three-dimensional projection view showing the appearance of an embodiment of an optical fiber polishing apparatus according to the present invention incorporating a constant velocity motion apparatus according to the present invention. FIG. 2 is a three-dimensional projection view showing a state in which a part of the optical fiber polishing apparatus shown in FIG. 1 is removed and disassembled. FIG. 3 is a plan view showing a state where a part of the optical fiber polishing apparatus shown in FIG. 1 is removed. FIG. 4 is a three-dimensional projection view showing a state in which a part of the optical fiber polishing apparatus shown in FIG. 2 is further removed and disassembled. 5 is a cross-sectional view taken along line VV in FIG. 3 in the embodiment shown in FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 3 in the embodiment shown in FIG. 7 is a cross-sectional view taken along the line VI-VI in FIG. 3 in the embodiment shown in FIG. FIG. 8 is a block diagram of the rotation speed control means in the embodiment shown in FIG. FIG. 9 is a graph showing the movement characteristics of the slider in the embodiment shown in FIG. FIG. 10 is a three-dimensional projection view showing the appearance of the fiber holder portion in the embodiment shown in FIG. FIG. 11 is a front view in which a part of the fiber holder shown in FIG. 10 is broken. FIG. 12 is a plan view in which a part of the fiber holder shown in FIG. 10 is broken. 13 is a cross-sectional view taken along line XIII-XIII in FIG. 14 is a cross-sectional view taken along line XIV-XIV in FIG. FIG. 15 is a conceptual diagram schematically showing the movement trajectory of the center of the optical fiber connection end face with respect to the polishing disk in the embodiment shown in FIG. FIG. 16 is a conceptual diagram schematically showing the movement locus of the center of the optical fiber connection end face when the polishing surface is further shifted by 90 degrees with respect to the movement locus shown in FIG.

An embodiment of an optical fiber polishing apparatus according to the present invention incorporating a constant velocity motion apparatus according to the present invention will be described in detail with reference to FIGS. However, the present invention is not limited to such an embodiment, and can be applied to any other technique belonging to the spirit of the present invention as necessary.

FIG. 1 shows the appearance of the optical fiber polishing apparatus in this embodiment, FIG. 2 shows the appearance of the state in which the fiber holder and the cover are removed and the polishing board and the slider are disassembled, and the plan view of the state in which the seat plate is removed is shown in FIG. Further, FIG. 3 shows an appearance of the base and a state in which the base, the guide member directly attached to the base, and the polishing disk support member are disassembled. That is, the optical fiber polishing apparatus 10 according to the present embodiment includes a base 11, a polishing disk support member 12, a polishing disk 13, a polishing disk turning means 14, a guide member 15, a slider 16, a slider driving means 17, The fiber holder 18 is provided.

The base 11 placed on the work floor via a pedestal (not shown) incorporating a vibration-proof rubber or the like has a plate shape having a flat mounting surface 11a with long sides and short sides of 400 mm × 300 mm, for example. The base 11 in the present embodiment employs a stone surface plate that is excellent in wear resistance and corrosion resistance and has less thermal deformation than general metals such as cast steel and aluminum alloy. Therefore, the surface of the stone surface plate becomes the mounting surface 11 a of the base 11. For example, a granite stone platen having a linear expansion coefficient of 8.0 × 10 ⁻⁶ / ° C. can be used as the base 11. Further, the flatness of the surface plate surface, that is, the mounting surface 11a depends on the number of optical connectors 19 to be polished at the same time and the length of the arrangement interval. The optical connector 19 functions as a connection end portion of the optical fiber in the present invention.

If the linear expansion coefficient of the material constituting the base 11 is 1.1 × 10 ⁻⁵ / ° C. or less, it is possible to adopt a metal such as cast iron, SUS430, 50% nickel steel, or ordinary steel as the base 11. It is. However, in the optical fiber polishing apparatus 10, a polishing process liquid is used during the polishing process, or water is used when cleaning the connection end surface 19 a of the optical connector 19. Work fluid and water adhere. In the case of cast iron or normal steel, corrosion occurs due to the working fluid or water, and therefore it cannot be said that it is suitable as the base 11 of the optical fiber polishing apparatus 10 in terms of corrosion resistance. Further, a metal such as 50% nickel steel has a low hardness and is not suitable for a material used as the base 11. Moreover, the processing strain remains in the metal material during the processing. In order to process these with high accuracy, it is necessary to remove strain generated by processing by a process such as slow strain. In this respect, SUS430 is a problem, and there is a problem that the manufacturing cost is higher than that of a stone surface plate.

On the other hand, the stone surface plate does not generate processing strain when processing the surface of the surface plate smoothly, and does not generate return or swelling due to processing. be able to. In addition, it should be noted that there is no oxidative corrosion due to water or the like, and it has a necessary and sufficient hardness when used as the base 11 of the optical fiber polishing apparatus 10.

FIG. 5 shows a cross-sectional structure taken along the line VV in FIG. A plurality of (four in the illustrated example) polishing disk support members 12 spaced apart from the front central portion of the mounting surface 11a of the base 11 are mounted on a columnar pedestal 20 and the upper end of the pedestal 20. Each having a ball bear unit 21. The ball bear unit 21 is held by a disk-like retainer 22 fitted so as to cover the upper end portion of the pedestal 20 and a plurality of openings formed in the retainer 22, with respect to the upper end surface 20 a of the pedestal 20. And a plurality of rolling ball steel balls 23 for rolling bearings. Each polishing disk support member 12 has an embedded nut 24 fixed to the base 11 so that the upper end does not protrude from the mounting surface 11 a of the base 11, and a fixing bolt screwed into the embedded nut 24 through the ball retainer 22 and the base 20. 25 on the mounting surface 11 a of the base 11. The upper end surface 20a of the pedestal 20 with which the steel balls 23 come into contact and the lower end surface 20b of the pedestal 20 in contact with the mounting surface 11a of the base 11 are processed in advance in parallel. The support portion of the present invention parallel to the mounting surface 11a will be defined.

The polishing disc 13 is mounted on the polishing disc support member 12 via a support portion of the polishing disc support member 12, that is, a steel ball 23, so as to be movable in a direction parallel to the mounting surface 11 a of the base 11. In order to reduce wear caused by rolling of the steel ball 23, the polishing disc 13 formed of a hard material having excellent wear resistance has a receiving surface 13a parallel to the mounting surface 11a of the base 11, and the surface thereof is Smooth finish. The receiving surface 13a in the present embodiment has a substantially square shape, and a square-shaped polishing film 27 is detachably attached to the receiving surface 13a via an elastically deformable elastic sheet 26, and the surface thereof is This is the polishing surface in the present invention.

FIG. 6 and FIG. 7 show the sectional structures taken along the lines VI-VI and VII-VII in FIG. 3, respectively. The polishing disk turning means 14 is disposed on the mounting surface 11 a of the base 11. The polishing disk turning means 14 is for rotating the polishing board 13 mounted on the polishing board support member 12 around an axis perpendicular to the mounting surface 11a of the base 11. The polishing disk turning means 14 in this embodiment includes a polishing disk drive motor 28 installed above the mounting surface 11 a of the base 11, a drive sprocket 29, an endless toothed belt 30, and a pair of front and rear synchronous sprockets 31. And a connecting pin 32 and a guide pulley 33.

The seat plate 34 to which the polishing disk drive motor 28 is fixed downward is disposed above the rear portion of the mounting surface 11a of the base 11. Between the seat plate 34 and the mounting surface 11 a of the base 11, a plurality (four in the illustrated example) of cylindrical columns 35 are interposed. The seat plate 34 uses an embedded nut 36 that is fixed to the base 11 so that the upper end does not protrude from the mounting surface 11 a of the base 11, and a column 35 that is screwed into the embedded nut 36 via a spacer 37. It is fixed above the attachment surface 11a. The drive sprocket 29 is integrally fitted between a mounting surface 11 a of the base 11 and a seat plate 34 on a rotating shaft 28 a of a polishing disk drive motor 28 that protrudes downward from the seat plate 34. The pair of synchronous sprockets 31 are arranged at the front center of the mounting surface 11a of the base 11 so as to be sandwiched between the previous polishing disc support members 12. Therefore, the lower portion of the stud shaft 39 is screwed into the embedded nut 38 fixed to the base 11 so that the upper end does not protrude from the mounting surface 11 a of the base 11, and the upper portion of the stud shaft 39 protruding from the mounting surface 11 a of the base 11 is inserted. On the other hand, the synchronous sprocket 31 is rotatably mounted. The synchronous sprocket 31 is provided with connecting pins 32 that are eccentric with respect to these stud shafts 39 by a predetermined amount, for example, r, and the connecting pins 32 are respectively formed on the back surface 13 b side of the polishing board 13. The fitting hole 40 is fitted so as to be relatively rotatable. The interval between the pair of front and rear pin fitting holes 40 is set to be the same as the interval between the stud shafts 39 of the synchronous sprocket 31, and the pair of connecting pins 32 and the pair of stud shafts 39 together with the synchronous sprocket 31 and the polishing disc 13 are four. Configure a joint parallel link mechanism. The toothed belt 30 is wound around a drive sprocket 29 and a pair of synchronous sprockets 31. The guide pulley 33 is for ensuring the meshing of the synchronous sprocket 31 and the toothed belt 30 and is attached to the mounting surface 11a of the base 11 along the left-right direction (left-right direction in FIG. 3). The position can be adjusted. More specifically, the guide pulley 33 is rotatably mounted on the support plate 41. The insertion position of the long hole 41a formed in the support plate 41 through which the fixing bolt 43 is screwed into the embedded nut 42 fixed to the base 11 so that the upper end does not protrude from the mounting surface 11a of the base 11 is adjusted. It can be done.

With this configuration, when the polishing disk drive motor 28 is operated, the polishing disk 13 does not change its posture, and the turning radius is set to r around the axis parallel to the stud shaft 39 on the polishing disk support member 12. Make a swivel motion.

The pair of guide members 15 extending in the front-rear direction of the base 11 (first direction in the present invention) is sandwiched between the polishing discs 13 in the left-right direction of the mounting surface 11a of the base 11 (second direction in the present invention). ) Fixed on both sides. More specifically, an embedded nut 44 that is fixed to the base 11 so that the upper end does not protrude from the mounting surface 11 a of the base 11, and a fixing bolt 45 that is screwed through the guide member 15 into the embedded nut 44. The pair of guide members 15 is fixed to the mounting surface 11 a of the base 11 by using the above. In this specification, “front” means lower in FIG. 3, and “rear” means upper. Further, “left and right” intersecting with this means left and right in FIG. The guide member 15 has a guide surface 15 a extending in the front-rear direction of the base 11 parallel to the mounting surface 11 a of the base 11.

The slider 16 that can move along the guide surface 15a of the guide member 15 is attached to the pair of guide members 15. The slider 16 includes a pair of sliding blocks 46 slidably held with respect to the pair of guide members 15, a connecting plate 47 disposed above the polishing board 13 so as to straddle the polishing board 13, and a pair of connecting blocks. 48. The connecting plate 47 integrally connects the pair of connecting blocks 48 disposed at the left and right ends thereof and the previous sliding block 46. The connection block 48 has a holder mounting surface 48a for arranging the fiber holder 18 with high accuracy.

The slider drive means 17 arranged on the attachment surface 11a of the base 11 is for reciprocating the slider 16 attached to the guide member 15 back and forth along the guide surface 15a. The slider drive means 17 in this embodiment includes a slider drive motor 49, a drive gear 50, a driven gear 51, an eccentric pin 52, and a guide groove 53.

The slider drive motor 49 in the present embodiment is a pulse motor, and is fixed downward to the previous seat plate 34 together with the polishing disk drive motor 28, and these are covered with a cover 54. The drive gear 50 is integrally fitted between a mounting surface 11 a of the base 11 and a seat plate 34 on a rotary shaft 49 a of a slider drive motor 49 that projects downward from the seat plate 34. A driven gear 51 as a rotating member in the present invention that meshes with the drive gear 50 is disposed at the rear end portion of the attachment surface 11 a of the base 11. For this reason, the embedded nut 55 fixed to the rear end portion of the base 11 so that the upper end does not protrude from the mounting surface 11a of the base 11 and the fixing bolt 57 screwed through the bearing 56 into the embedded nut 55 are used. Thus, the driven gear 51 is rotatably supported on the mounting surface 11 a of the base 11 via the bearing 56. On the upper end surface 51 a of the driven gear 51, an eccentric pin 52 that is eccentric by a predetermined amount, for example, s with respect to the rotation axis of the driven gear 51 is projected. The eccentric pin 52 is slidably engaged with a guide groove 53 formed on the back surface 47 a side of the connecting plate 47. The guide groove 53 having a length that is twice or more the previous eccentric amount s extends along the left-right direction of the base 11.

Accordingly, when the slider driving motor 49 is operated, the connecting plate 47 of the slider 16 having the guide groove 53 that engages with the eccentric pin 52 as the driven gear 51 rotates is along the guide surface 15 a of the guide member 15. Thus, it will reciprocate with a stroke of 2 s back and forth. In this case, in this embodiment, a rotational speed control means 58 for controlling the rotational speed of the driven gear 51 (more precisely, the peripheral speed of the eccentric pin 52) is provided, and the control block is schematically shown in FIG. The rotational speed control means 58 controls the linear movement speed of the slider 16 along the front-rear direction of the base 11 to be constant except for the reciprocating end. More specifically, any one of the reciprocating ends of the slider 16 is set as a reference position, the time from the reference position is t, the moving speed of the slider 16 is c, the eccentric amount of the eccentric pin 52 and its reference position. , And θ and θ (t), the rotational speed control means 58 is configured so that the angular velocity θ (t) of the eccentric pin 52 is θ ( t) = cos ⁻¹ {1- (t · c / s)}
When π ≦ θ ≦ 2π, θ (t) = cos ⁻¹ {(t · c / s) −3}
The rotational speed of the eccentric pin 52 of the driven gear 51 is controlled so as to satisfy the above condition. For this reason, the rotation speed control means 58 in this embodiment includes a photoelectric switch 59 as a position detection means of the present invention, a timer 60, a target rotation speed setting section 61, a drive pulse setting section 62, and a motor driver 63. Have

In the present embodiment, the rotational position of the eccentric pin 52 shown in FIG. 3 where the eccentric pin 52 is located most rearward with respect to the rotation axis of the driven gear 51 is the reference position (0 degree), and conversely, the eccentric pin 52 is most forward. The rotational position of the eccentric pin 52 located at is 180 degrees. The photoelectric switch 59 is fixed to the front end portion of the seat plate 34, and when the slider 16 reaches its retracted end, the dog 64 projecting behind the slider 16 blocks the photoelectric switch 59, so that the photoelectric switch 59 is turned off to detect the backward end. The timer 60 counts the time from when the photoelectric switch 59 is turned off, that is, when the reference position of the slider 16 is detected, and outputs the counted time to the target rotational speed setting unit 61. The target rotation speed setting unit 61 sets the target rotation speed V of the eccentric pin 52 of the driven gear 51 according to the count value by the timer 60 and outputs this to the drive pulse setting unit 62. The drive pulse setting unit 62 sets a drive pulse P for driving the slider drive motor 49 corresponding to the target rotation speed V set by the target rotation speed setting unit 61, and outputs this to the motor driver 63. To do. The motor driver 63 outputs the drive pulse P set by the drive pulse setting unit 62 to the slider drive motor 49 to control its rotation.

Here, when the eccentric amount s of the eccentric pin 52 is 33 mm and the slider 16 is reciprocated linearly at a speed of 5 mm per second, the rotational angle θ from the reference position of the eccentric pin 52 every 0.2 seconds and the angular velocity θ ( Tables 1 and 2 show the relationship between t), the target rotational speed V of the eccentric pin 52 of the driven gear 51, and the drive pulse P.

As described above, in the present invention, θ (t) = cos ⁻¹ {1- (t · c / s)} when 0 ≦ θ ≦ π and θ (t) = when π ≦ θ ≦ 2π. The data shown in Table 1 is stored in advance in the target rotation speed setting unit 61 and the drive pulse setting unit 62 so that cos ⁻¹ {(t · c / s) −3}. For these data, corresponding values are output every 0.2 seconds based on a signal from the timer 60, for example. FIG. 9 shows the relationship between the rotational speed of the eccentric pin 52 of the driven gear 51 of the slider driving means 17 and the moving speed of the slider 16. For comparison, a conventional configuration in which the rotational speed of the eccentric pin 52 is kept constant is indicated by a broken line. When the rotational speed of the driven gear 51 is a constant speed indicated by a broken line as in the prior art, the moving speed of the slider 16 changes in a sine waveform as indicated by the broken line in the figure. Such a change impairs uniform wear of the polishing film 27.

Incidentally, when the rotational position P of the eccentric pin 52 of the driven gear 51 approaches 0 degrees and 180 degrees, the angular velocity θ (t) increases infinitely. This is for controlling the moving speed of the slider 16 to a constant speed c. Actually, when the rotational position P of the eccentric pin 52 of the driven gear 51 is 0 degree and 180 degrees, the moving direction of the slider 16 is switched back and forth, so that the moving speed of the slider 16 is reduced from the constant speed c to 0. Then, the speed is increased from 0 to a constant speed c in the reverse direction. That is, since the rotational speed of the driven gear 51 is finite according to the rotational speed of the slider drive motor 49, the slider 16 gradually decelerates from the constant speed c, and as a result, the direction of movement of the slider 16 can be set comfortably. It can be changed. Therefore, by changing the target rotational speed V of the eccentric pin 52 of the driven gear 51 as shown by the solid line in FIG. 9, the moving speed of the slider 16 can be set to a constant speed as shown by the solid line in the figure. It becomes possible. As a result, as will be described later, the polishing film 27 can be more evenly worn, extending its life and reducing the replacement frequency.

The appearance of the fiber holder 18 in the present embodiment is shown in FIG. 10, the front shape and the planar shape are partially broken, respectively, and shown in FIGS. 11 and 12, taken along line XIII-XIII in FIG. The shape is shown in FIG. 13, and the cross-sectional shape taken along the line XIV-XIV in FIG. 11 is shown in FIG. The fiber holder 18 includes an optical connector mounting plate 65, a guide column 66, a lifting block 67, and a pressing member 68. The fiber holder 18 is detachably fixed to the connection block 48 in a state where the attachment reference surface 65 a formed on the back surface of the optical connector attachment plate 65 is in contact with the holder attachment surface 48 a of the connection block 48.

The optical connector mounting plate 65 has a plurality of front and rear optical connector mounting holes 69 arranged at a predetermined interval p along the longitudinal direction (left and right direction in FIG. 11). With respect to the arrangement interval p of the optical connector mounting holes 69 in one row, the optical connector mounting holes 69 in the other row are arranged so as to be shifted by 1/2 pitch, that is, p / 2 along these arrangement directions. . These optical connector mounting holes 69 serve as a fiber holding portion of the present invention that removably holds the optical connector 19 that is polished when the connection end surface 19a (see FIG. 13) is pressed against the polishing film 27 affixed to the polishing board 13. Function.

The arrangement interval p of the optical connector mounting holes 69 is set to an eccentricity r of the connecting pins 32 of the synchronous sprocket 31 so that the turning radius r of the polishing board 13 is not an integral multiple of the arrangement interval p of the optical connector mounting holes 69. It is set in association. That is, by setting r ≠ np (where n is an integer), it is possible to avoid overlapping of the polishing trajectory of the connection end surface 19a of the optical connector 19 with respect to the polishing film 27 and to effectively use the polishing film 27. For example, it can be said that r = 0.45p is preferable in order to make effective use of the polishing film 27 to the maximum extent.

A pair of mutually parallel guide columns 66 arranged in the left-right direction are fixed on the optical connector mounting plate 65 via bolts 70 at their lower ends, and are attached to the mounting surface 11 a of the base 11. Extends vertically.

The elevating block 67 further includes a lower bracket 71, an upper bracket 72, and a plurality of connecting shafts 73 that connect them. The lower bracket 71 is integrally fixed with lower ends of connecting shafts 73 arranged at a predetermined interval p in association with the optical connector mounting holes 69, and the upper ends of these connecting shafts 73 are connected to upper portions via fixing bolts 74. A bracket 72 is integrally connected. A pressing member 68 for pressing the optical connector 19 downward is fitted to each connecting shaft 73 so as to be slidable in a direction perpendicular to the mounting surface 11 a of the base 11. Further, a compression coil spring 75 for biasing the pressing member 68 toward the lower bracket 71 is interposed between the upper bracket 72 and each pressing member 68, and the connecting shaft 73 is inserted through these. It has become. In the present embodiment, consideration is given to reducing variation in the pressing force applied to the optical connector 19 by using a long compression coil spring 75 having a small spring constant. Guide struts 66 are inserted into the lower part of the lift block 67 and the left and right ends of the

upper brackets

71 and 72, and the lift block 67 can be lifted and lowered with respect to the guide strut 66. The guide column 66 is formed with a groove 66a extending in the vertical direction. Both end portions of the penetrating pin 76 passing through the guide post 66 in the front-rear direction through the groove 66a are fitted to the upper bracket 72 so that the lifting block 67 does not come off from the guide post 66. . Spherical gripping portions 78 having clamp pins 77 are disposed at both left and right end portions of the upper bracket 72. The clamp pin 77 is held by the upper bracket 72 so that its tip is slidable in the left-right direction facing the guide column 66. The distal end portion of the clamp pin 77 can be fitted into

positioning holes

79 and 80 formed on the upper end side and the lower portion of the guide column 66. The positioning holes 79 and 80 define the retracted position and the machining position of the lifting block 67. Between the clamp pin 77 and the upper bracket 72, a spring 81 for urging the tip of the clamp pin 77 toward the guide column 66 is incorporated. The operator grips the grip portion 78 against the biasing force of the spring 81 and pulls the clamp pin 77 so that the tip of the clamp pin 77 is separated from the guide column 66, so that the lifting block 67 is moved against the guide column 66. It can be moved up and down. In the state shown by the solid line in FIG. 11 in which the clamp pin 77 is fitted in the lower positioning hole 79, the pressing member 68 is pressed against the optical connector 19 mounted in the optical connector mounting hole 69 by the spring force of the compression coil spring 75. . As a result, the connection end surface 19a is projected from the lower surface of the optical connector mounting plate 65 as shown in FIG. On the other hand, in the state indicated by the two-dot chain line in FIG. 11 in which the clamp pin 77 is fitted in the upper positioning hole 80, the pressing member 68 is retracted above the optical connector mounting plate 65 together with the lifting block 67. As a result, the optical connector 19 can be attached to and detached from the optical connector mounting hole 69 of the optical connector mounting plate 65 safely and easily.

Therefore, when the optical connector 19 is attached to or detached from the optical connector mounting hole 69 of the optical connector mounting plate 65, the lifting block 67 is raised to the retracted position, whereby the pressing member 68 is moved to two points in FIG. It rises to the position indicated by the chain line. Thereby, the attachment / detachment work of the optical connector 19 with respect to the optical connector mounting hole 69 can be easily performed.

In the present embodiment, the spring 82 is housed in the cylindrical guide column 66, and the upper end of the spring 82 abuts against the penetrating pin 76 of the lifting block 67 located below the guide column 66 by its own weight to push it up. It has become. When the clamp pin 77 is not fitted into the lower positioning hole 79, the lifting block 67 is pushed up by the spring force of the spring 82, so that the pressing member 68 does not press against the optical connector 19 mounted in the optical connector mounting hole 69. Is set to That is, it is necessary to fit the tip of the clamp pin 77 into the lower positioning hole 79 in a state where the lifting block 67 is pushed down against the force of the spring 82. By doing so, it is considered that an excessive pressing force is not applied to the connection end surface 19a of the optical connector 19 mounted in the optical connector mounting hole 69.

The optical fiber polishing apparatus 10 in this embodiment further includes a holder attaching / detaching means 83. The holder attaching / detaching means 83 is for detachably connecting the fiber holder 18 to the slider 16 and uses a toggle clamp in this embodiment. That is, a pair of left and right toggle clamps 83 are fixed to a connecting block 48 whose left and right ends are screwed to the sliding block 46 together with the connecting plate 47. When the lock lever 84 of the toggle clamp 83 is raised to the clamped state shown in FIG. 1, the tip of the clamp arm 85 presses against the upper surface of the optical connector mounting plate 65 of the fiber holder 18 facing the polishing disc 13. As a result, the holder mounting surface 48a of the connecting block 48 comes into contact with and closely contacts the mounting reference surface 65a of the optical connector mounting plate 65, and the fiber holder 18 is fixed integrally to the connecting block 48 of the slider 16. In this case, the connection end surface 19 a of the optical connector 19 attached to the fiber holder 18 is pressed against the polishing film 27 of the polishing board 13 with an appropriate pressing force by the urging force of the compression coil spring 75. Conversely, when the lock lever 84 of the toggle clamp 83 is tilted to the unclamped state and the lifting block 67 of the fiber holder 18 is raised to the retracted position, the fiber holder 18 can be removed from the polishing board 13. In this case, when the optical connector 19 is attached to or detached from the fiber holder 18, the attaching / detaching operation can be easily and safely performed without bringing the connection end face 19 a into contact with the polishing film 27.

In addition, when the lock lever 84 of the toggle clamp 83 described above is raised to the clamped state, the connection end surface 19a of the optical connector 19 comes into contact with the polishing film 27 of the polishing board 13. For this reason, the optical connector 19 is pushed up against the spring force of the compression coil spring 75 together with the pressing member 68. Accordingly, the processing position of the lifting block 67 of the fiber holder 18, that is, the position of the lower positioning hole 79 in the guide column 66 so that an appropriate processing pressure acts on the polishing film 27 on the connection end surface 19 a of the optical connector 19. Is set.

As described above, when the polishing disk support member 12, the polishing disk turning means 14, the guide member 15, the slider driving means 17 and the like are arranged with reference to the mounting surface 11a of the base 11, a commercially available mechanical component having a predetermined accuracy is used. The desired assembly accuracy can be easily achieved by diverting.

When the connection end faces 19a of the 24 optical connectors 19 are polished using the optical fiber polishing apparatus 10 in this embodiment, the movement trajectory of these centers with respect to the polishing board 13 is schematically shown in FIG. As is clear from FIG. 15, the movement trajectory of the connection end surface 19a of the optical connector 19 can be prevented from completely overlapping with the polishing board 13 during the polishing operation. Therefore, even if foreign matter or the like is present on the polishing board 13, it is possible to avoid a problem that the connection end surfaces 19a of all the optical connectors 19 that are simultaneously polished are damaged. Furthermore, it is also possible to polish the connection end surfaces 19a of the new 24 optical connectors 19 by changing the direction of the polishing film 27 by 90 degrees from this state. This state is shown in FIG. In particular, by making the polishing film 27 square, it was confirmed that almost the entire surface of the polishing film 27 could be used effectively, and that the life of the polishing film 27 could be extended compared to the conventional one.

It should be noted that the present invention should be construed only from the matters described in the claims, and in the above-described embodiment, all the changes and modifications included in the concept of the present invention are other than those described. Is possible. For example, as the polishing plate support member 12, the polishing plate turning means 14, the guide member 15, the slider driving means 17, the holder attaching / detaching means 83, etc., any configuration other than the above-described embodiment may be adopted as necessary. it can. That is, all matters in the above-described embodiment are not intended to limit the present invention, and include any configuration not directly related to the present invention. To get.

DESCRIPTION OF SYMBOLS 10 Optical fiber polisher 11 Base 11a Mounting surface 12 Polishing disk support member 13 Polishing disk 13a Polishing surface 13b Back surface 14 Polishing disk turning means 15 Guide member 15a Guide surface 16 Slider 17 Slider driving means 18 Fiber holder 18a Mounting surface 19 Optical connector 19a Connection end surface 20 Base 20a Upper end surface 20b Lower end surface 21 Ball bear unit 22 Retainer 23 Steel ball 24 Embedded nut 25 Fixing bolt 26 Elastic sheet 27 Polishing film 28 Polishing disk drive motor 28a Rotating shaft 29 Drive sprocket 30 Toothed belt 31 Synchronous sprocket 32 Connecting Pin 33 Guide Pulley 34 Seat Plate 35 Strut 36 Embedded Nuts 37 Spacer 38 Embedded Nuts 39 Stud Shaft 40 Pin Fitting Hole 41 Support Plate 42 Insertion nut 43 Fixing bolt 44 Embedded nut 45 Fixing bolt 46 Sliding block 47 Connecting plate 48 Connecting block 48a Holder mounting surface 49 Slider driving motor 49a Rotating shaft 50 Driving gear 51 Driven gear 51a Upper end surface 52 Eccentric pin 53 Guide groove 54 cover 55 embedded nut 56 bearing 57 fixing bolt 58 rotational speed control means 59 photoelectric switch 60 timer 61 target rotational speed setting section 62 drive pulse setting section 63 motor driver 64 dog 65 optical connector mounting plate 65a mounting reference surface 66 guide post 66a groove Hole 67 Elevating block 68 Press member 69 Optical connector mounting hole 70 Bolt 71 Lower bracket 72 Upper bracket 73 Connecting shaft 74 Fixing bolt 75 Compression coil spring 76 Through pin 77 Clamp pin 78 Grip part 79, 80 Positioning hole 81, 82 Spring 83 Toggle clamp (holder attachment / detachment means)
84 Lock lever 85 Clamp arm r, s Eccentricity p Interval

Claims

A slider driving means is provided on a guide member having a guide surface extending in the first direction, and reciprocally moves a slider movable along the guide surface of the guide member. A motor, a rotating member that is driven to rotate about an axis orthogonal to the first direction by the drive motor, and a protruding member that protrudes from the rotating member in a position parallel to the rotating axis of the rotating member and away from the rotating member. An eccentric pin, and a guide groove formed on the slider so as to extend in the first direction and a second direction orthogonal to the rotation axis of the rotating member, and the eccentric pin is slidably fitted therein A reciprocating linear motion device comprising:
Rotating speed control means for controlling the rotating speed of the rotating member is provided so that the linear moving speed of the slider along the first direction is constant except for its reciprocating end. High speed reciprocating linear motion device.
Any one of the reciprocating ends of the slider is set as a reference position, a time from the reference position is t, a moving speed of the slider is c, an eccentric amount of the eccentric pin, a rotation angle from the reference position, and When the angular velocity is represented by s, and θ and θ (t), the rotational speed control means, when the angular velocity θ (t) of the eccentric pin satisfies the following formula 0 ≦ θ ≦ π, θ (t) = cos −1 {1- (t · c / s)}
When π ≦ θ ≦ 2π, θ (t) = cos −1 {(t · c / s) −3}
The constant-speed reciprocating linear motion device according to claim 1, wherein the rotational speed of the rotating member is controlled so as to satisfy
The drive motor is a pulse motor, and the rotational speed control means is
Position detecting means for detecting a reference position of the slider along the first direction;
A timer that counts the time from when the position detecting means detects the reference position of the slider;
Setting means for setting a target rotation speed of the rotating member according to a count value by the timer;
A drive pulse setting section for setting a drive pulse for driving the pulse motor in accordance with the target rotational speed set by the setting means;
The constant velocity reciprocating linear motion device according to claim 1, further comprising: a motor driver that outputs the driving pulse set by the driving pulse setting unit to the driving motor.
Base and
A polishing disk support member provided on the base;
A polishing machine mounted movably with respect to the polishing board support member;
A polishing disk turning means for rotating the polishing board with respect to the polishing disk support member;
A guide member provided on the base;
A slider attached to the guide member and capable of reciprocating linear movement along the guide member;
Slider driving means for reciprocating linear movement of the slider along the guide member;
A plurality of fiber holding portions connected to the slider and detachably holding a connection end of an optical fiber that is pressed against the polishing surface of the polishing disc and polished; A constant velocity reciprocating linear motion device according to any one of claims 1 to 3, wherein the slider driving means is a fiber holder arranged along a direction intersecting a reciprocating linear motion direction of the slider. Optical fiber polishing equipment.
The optical fiber polishing apparatus according to claim 4, wherein the polishing surface of the polishing disk is formed by a surface of a substantially square polishing film that is detachably attached to the polishing disk.