JPH042388B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a polishing machine for ferrules used in optical fiber connectors. The present invention relates to a small, lightweight, and simple portable polishing machine that can perform rough machining and finishing of the end face of an optical fiber ferrule even at a connection site.

2. Description of the Related Art Generally, a ferrule used in an optical fiber connector has a configuration shown in FIG. The optical fiber 2 is accommodated in an optical fiber hole 120 provided at the center of the ferrule 1 and fixed with adhesive.

On the other hand, since connection loss of an optical fiber is caused by discontinuity of the connection core, in order to propagate an optical signal without loss, it is necessary to butt the end surfaces 110 of two ferrules 1 having the configuration shown in FIG. It is necessary to join the end faces of the optical fibers so that the optical axes of the optical fibers do not shift and there are no gaps. For this purpose, the ferrule end face 110 is polished, but at this time, the top of the optical fiber part is made spherical,
Moreover, it is necessary to create a state in which there is no step between the ferrule end face 110 and the optical fiber end face.

An example of a polishing apparatus conventionally used for polishing the end face of a ferrule will be described with reference to FIGS. 9 to 11. Figure 9 is a diagram explaining the polishing operation, Figure 10 is a schematic diagram of the top surface of the device, and Figure 11 is a diagram explaining the polishing operation.
The figure shows a state in which the ferrule is attached to the ferrule holder.

This polishing device 130 includes a fixing base 131 for fixing the ferrule holder 4 when attaching the ferrule 1 to the ferrule holder 4, a rough polishing surface plate 13a having a flat grinding wheel, and a concave spherical rough finishing whetstone. It is equipped with a rough polishing surface plate 13b having a rough finish polishing surface plate 13b having a concave spherical finishing whetstone, and a finish polishing surface plate 13c having a concave spherical finishing whetstone, and a hole provided in the center of each polishing surface plate supports a ferrule holder 4. A drive shaft 18 is disposed for swinging motion. As shown in FIGS. 10 and 11, the ferrule holder 4 consists of a holder main body 4a and a presser plate 4b, and the ferrule 1 is fitted into V-grooves provided on three sides of the holder main body 4a, and the ferrule 1 is inserted from above. By tightening and fixing the holding plate 4b with screws 17, the ferrule 1 is fixed so as to be perpendicular to the polishing surface of the polishing surface plate.
As described above, the polishing surface of the rough polishing surface plate 13a is a flat surface, and the polishing surfaces of the rough polishing surface plate 13b and the final polishing surface plate 13c are concave spherical surfaces. Use ferrules 1 with different mounting angles depending on the situation.

Ferrules are usually made of hard materials such as ceramics. Therefore, in order to process this into a certain shape with high efficiency and to achieve a final finish with a mirror surface with a maximum unevenness of about 0.01 μm, rough processing, polishing, and rough polishing are required depending on the grade of the processed surface and the efficiency of polishing. Three polishing steps are required: final polishing and finish polishing. For this reason, a polishing apparatus equipped with three rotating polishing plates as shown in FIG. 10 is used.

The polishing process will be explained below.

(Rough processing and polishing) First, the ferrule holder 4 for rough processing and polishing is fixed to the fixed base 131, and the ferrules 1 are attached at three locations. Next, the ferrule holder 4 with the ferrule 1 attached thereto is attached to the drive shaft 18 disposed in the center hole of the rough polishing surface plate 13a. During polishing, three ferrules 1 are always attached in order to make the pressing force against the polishing surface uniform and to keep the ferrule holder 4 stable on the polishing surface plate. Next, as shown in FIG. 9a, the ferrule 1 is pressed against the polishing surface, and the rough polishing surface plate 13a is rotated while supplying the polishing agent from the polishing agent supply nozzle 16. At the same time, the ferrule holder 4 is caused to rotate or swing (precess) in a circular manner by the drive shaft 18 (not shown in FIG. 9). By the movement of both the polishing surface plate 13a and the ferrule holder 4, the adhesive adhering to the end face of the ferrule is removed and the lengths of the three ferrules are also made equal.

(Rough Finish Polishing) Next, the three ferrules 1 are removed from the ferrule holder 4 for rough polishing and attached to the ferrule holder 4 for rough polishing fixed to the fixed base 131. The ferrule holder 4 with the ferrule 1 attached is attached to the drive shaft 18 placed in the hole of the rough polishing surface plate 13b, and the ferrule 1 is pressed against the polishing surface as shown in FIG. 9b to perform rough machining. Polish as well as polish. As a result, Ferrule 1
The end face of is processed into a spherical surface with a specified curvature.

(Final polishing) Finally, remove the ferrule holder 4 from the drive shaft 18 of the rough polishing surface plate 13b, and
The ferrule 1 is attached to the drive shaft 18 of FIG. 9c, and the ferrule 1 is pressed against the polishing surface as shown in FIG. Thereby, the end face of the ferrule 1 is finished smoothly.

Problems to be Solved by the Invention When using a conventional polishing device, as mentioned above,
In order to precisely process the end face of the ferrule, it was necessary to perform at least three polishing steps.

Further, even when polishing only one ferrule, it is not possible to polish it unless two dummy ferrules are attached, resulting in poor workability.

Furthermore, since the ferrule holder is simply rotated or oscillated (precession) in a circle, the center symmetry of the end face of the ferrule is poor.

Furthermore, since three ferrules are supported and polished at once, and the ferrules are caused to swing (precession), the device is large and heavy.

Therefore, a first object of the present invention is to provide an optical fiber ferrule polishing machine that makes it possible to reduce the number of steps required for polishing.

A second object of the present invention is to provide an optical fiber ferrule polishing machine that is capable of polishing only one optical fiber connector.

A third object of the present invention is to provide an optical fiber ferrule polishing machine that can polish the ferrule end face with good center symmetry.

A fourth object of the present invention is to provide a small and lightweight optical fiber ferrule polishing machine.

Means for Solving the Problems According to the present invention, a rotating shaft, a drive motor for driving the rotating shaft, a polishing means having a polishing surface attached to the rotating shaft, and a ferrule to which an optical fiber is attached and fixed are provided. It consists of a cylindrical first member and a second member that have a storable space and can be screwed together, and by inserting a ferrule into the first member and screwing the second member together. a holding means for fixedly holding the ferrule with the tip of the ferrule protruding; a stage member for rotatably supporting the holding means so that the tip of the ferrule is opposed to the polishing surface of the polishing means; a rotational drive means for rotating the holding means;
The stage member is movably supported so that the tip of the ferrule can be pressed against the polishing surface of the polishing means, and stage mounting means in which the central axis of the ferrule is adjustable in angle; shifting means for applying a shifting force to the stage member so as to press the tip of the ferrule against the polishing surface of the polishing means; a driven means fixed to a stage member; a tracing surface means that the driven means comes into contact with due to a deflecting force by the shifting means; and a displacement means for relatively displacing the surface means, and as the distal end of the driven means moves on the tracing surface means by the displacement means while abutting the tracing surface means, the stage An optical fiber ferrule polishing machine is provided, wherein the tip of the ferrule supported by a member is pressed against the polishing surface and polished.

Function In the optical fiber ferrule polishing machine according to the present invention described above, first, using a polishing means for rough processing,
Polishing is performed as follows. Rotating a holding means configured to hold only one ferrule,
Rotate the ferrule. On the other hand, since the stage member is receiving the shifting force by the deflecting means, the tip of the rotating ferrule is caused to move in accordance with the tracing surface means due to the cooperation between the driven means and the tracing surface means. It is pressed against a polishing means and polished. At this time, during rough machining, the ferrule is pressed against the polishing surface while being inclined at a predetermined angle with respect to the polishing surface, and at the same time the adhesive is removed, the tip of the ferrule is processed into a substantially conical shape. Next, using a polishing surface means for finishing,
Polishing is carried out in the same manner as with the polishing means for rough machining.
At this time, the ferrule is pressed perpendicularly to the polishing surface. Thus, the ferrule tip is
It is polished into a convex spherical surface that is axially symmetrical about its axis of rotation.

As described above, according to the present invention, it is possible to polish a single ferrule without requiring a dummy.

Furthermore, since the angle of the central axis of the ferrule can be adjusted with respect to the normal to the part of the polishing surface against which the tip of the ferrule to be polished is pressed, it is possible to polish the ferrule with a predetermined inclination during rough machining. This allows the attached adhesive to be removed and at the same time the tip of the ferrule to be shaped into a substantially conical shape. Therefore, it is possible to perform final polishing without the rough finishing polishing required in conventional polishing equipment, and it is possible to finish the ferrule end face with two polishing steps.

Further, since the ferrule is rotated by rotating the holding means, the tip of the ferrule can be polished with good symmetry around the axis of rotation.

Furthermore, since there is no need to cause the ferrule to swing in a circular motion (precession motion), it is possible to reduce the size and weight of the optical fiber ferrule polishing machine.

Embodiments Hereinafter, embodiments of an optical fiber ferrule polishing machine according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a partially sectional perspective view of an optical fiber ferrule polishing machine embodying the present invention. The illustrated optical fiber ferrule polishing machine is configured for rough polishing.

As shown in FIG. 8, the ferrule 1 into which the optical fiber 2 is inserted and fixed is held by a holder consisting of a chuck 4 and a housing 3 as described below. The ferrule 1 is inserted into the conical tip of the chuck 4. The conical tip of the chuck 4 is provided with a plurality of vertical slits.
It has entered the opening at the tip of the cylindrical housing 3. The chuck 4 itself is screwed into its housing 3. Connect chuck 4 to housing 3
The conical tip of the chuck 4 is rotated relative to the housing 3 to push the conical tip of the chuck 4 into the tip opening of the housing 3, thereby constricting the conical tip of the chuck 4 to securely hold the ferrule.

The housing 3 is rotatably supported by a ball bearing at the center of the stage 5, and its movement in the axial direction is restricted. Stage 5 is
It is supported by a stage mounting block 7 by two parallel plate springs 6. Parallel leaf spring 6 exerts a downward deflection force on stage 5 in FIG. The stage mounting block 7 is connected to the chuck 4.
The support member 8 is rotatably displaceable about an axis perpendicular to the axis of the support member 8.
The support member 8 is rotatably attached to a rotation axis 81 perpendicular to a horizontal plane including the rotational displacement axis of the stage mounting block 7. In the case of rough polishing, the stage mounting block 7 is displaced around its rotational displacement axis and fixed to the support member 8 so that the axis of the chuck 4 and the rotation axis 81 are tilted at a slight angle. There is. In the case of final polishing, the axial center of the chuck 4 and the rotating shaft 81 are set parallel to each other.

Further, the stage 5 is provided with a protrusion 10 as a driven means, and the tip of the protrusion 10 is applied with a pressing force by the parallel leaf spring 6 onto the tracing surface of the fixed taper member 9, which is the tracing surface means. Contact is made in a bent state. Preferably, as shown in FIG. 6, a small roller 10A is provided at the tip of the projection 10. On the other hand, as similarly shown in FIG.
The ferrule 1 has a flat surface 9A that is parallel to the polishing surface portion to which the tip of the ferrule 1 is pressed, which is maintained apart from the polishing surface of the ferrule 3, that is, a first tracing surface 9A. Furthermore, by displacing the stage 5 in the direction of the thick arrow in FIG.
A second tracing surface 9B is connected to the first tracing surface 9A and is inclined so that the tip of the ferrule gradually approaches the polishing surface of the grindstone 13. On the second tracing surface 9B, a flat third
This third tracing surface 9C, in which the tracing surface 9C is continuous, is for stopping the approach of the tip of the ferrule 1 to the polishing surface within a predetermined range, and is used for polishing where the tip of the ferrule 1 is pressed against the polishing surface. It is parallel to the surface part.

Furthermore, the housing 3 is configured to be rotationally driven by a forward/reverse rotation drive section 11 provided integrally with the stage 5 via a pulley 11A, a drive belt 12, and a pulley 11B. The ferrule 1 held by the chuck 4 rotates on its axis. The whetstone 13 is the chuck 4
The ferrule held by the ferrule is fixed to a rotating shaft 13A perpendicular to the direction of the pressing force by the parallel leaf spring 6, and the rotating shaft 13A is rotationally driven by a drive motor 13B.

Polishing by the rough polishing machine configured as described above will be explained with reference to FIG. 2.

In the initial state, the protrusion 10 is on the flat first tracing surface 9A of the tapered member 9, and even if the tip of the ferrule 1 is opposed to the outer peripheral surface of the grindstone 13, the tip surface 110 of the ferrule 1 is It does not contact the outer peripheral surface of the grindstone 13 and is not processed. At this time, check 4
Since the axis of the ferrule 1 and the rotation axis 81 are inclined at a slight angle, the ferrule 1 and the grindstone 13 are in the same positional relationship as the ferrule 1 and the grindstone 13 shown at the left end of FIG.

From this state, the support member 8 is rotated in the direction of the bold arrow in FIG. 1 with the rotation axis 81 as a reference. As the support member 8 continues to rotate, the protrusion 10 touches the inclined second tracing surface 9B of the tapered member 9, and the stage 5
is lowered along the inclined surface by the pressing force of the parallel leaf spring 6, and a cut is given to the ferrule end face 110 by the grindstone 13, and machining is started. This state is the ferrule 1 and grindstone 1 shown in the center of Figure 2.
This is the positional relationship with 3.

At this time, the ferrule 1
1 and the drive belt 12, at least 360
Since the machine is rotated forward and backward at a rotation angle of more than 100 degrees, the machined surface has a truncated conical shape. Thereafter, cutting guidance is performed by the taper member 9 until the end face shape of the ferrule becomes a conical shape.

After the conical shape is obtained, as the support member 8 further rotates, the protrusion 10 becomes the flat third portion of the tapered member 9.
The tip of the ferrule is stopped from approaching the polished surface, producing a spark-out effect.

Thus, by rotating the support member 8 so as to scan once over the surface of the tapered member 9, a desired end face shape can be obtained during rough machining.

In the embodiments described above, the taper member 9 is fixed and the stage 5 is rotatably displaced. Therefore, as can be seen from FIG. 2, the contact position of the tip of the ferrule with the polishing surface of the grindstone 13 moves on the polishing surface, and local wear of the polishing surface is prevented. However, if this problem is not considered, for example, if the grindstone 13 is frequently replaced, the stage 5 may not be rotationally displaced, and the tapered member 9 may be displaced instead.

In addition, in the final polishing, as shown in FIG. 21, an abrasive-supporting sheet 22 stretched on the rotating plate 21 at right angles to the direction of the pressing force of the plate spring 6 against the ferrule 1, and an abrasive-supplying nozzle 2 that supplies abrasive to the abrasive-supporting sheet 22.
3. Note that the rotating shaft 20
is driven by a motor (not shown). Also,
The abrasive-carrying sheet 22 is composed of a hard resin disk, a resin film stretched and held in the shape of a diaphragm, or a nonwoven fabric. As the abrasive, a processing liquid containing fine particles is used. In other respects, the mechanical structure is exactly the same as that of the rough polishing machine described above, except that the inclined surface of the tapered member 9, which is the tracing surface means, is made into a flat surface.

FIG. 4 shows another example of the holder.
A protrusion 3A that protrudes inward is provided at the tip of the housing 3, a through hole is formed in the protrusion 3A, and the ferrule 1 is inserted into the through hole. A male thread is cut around the protrusion 3A, and a housing nut 31 is screwed therein. Thus, the flange 1A of the ferrule is held between the protrusion 3A and the housing nut 31, thereby fixing the ferrule to the housing 3.

FIG. 5 shows an example of the mechanism of the forward/reverse rotation drive unit 11. The illustrated mechanism is a fixed internal gear 111
and meshes with the internal gear 111, and the internal gear 1
Planetary gear 112 with a pitch circle diameter of 1/2 of 11
It is equipped with The planetary gear 112 is rotatably attached to the tip of a lever 114 that is fixed to a drive motor shaft 113 that rotates in one direction and rotates. The illustrated mechanism further includes a pin 115 fixed upright on the pitch circle of the planetary gear 112.
The pin 115 is inserted into a hole in the rack 117. The rack 117 has linear guide portions 11 at both ends.
6, and is capable of reciprocating linear movement regulated by its linear guide portion 116.
A pinion gear 118 is engaged with the rack 117, and the rotating shaft of the pinion gear 118 rotationally drives the pulley 11A of the forward/reverse rotation drive section 11 described above.

With this configuration, as the motor shaft 113 rotates, the pin 115 passes through the central axis of the internal gear 111 and makes a reciprocating linear movement with a stroke of the pitch circle diameter of the internal gear 111. This linear motion is converted into rotational motion by a rack 117 and a pinion gear 118, and is used as a forward/reverse rotation drive source.

Instead of the reciprocating motion generating mechanism of the forward/reverse rotation drive unit 11 described above, which is composed of the internal gear 111, the planetary gear 112, the drive motor shaft 113, the lever 114, and the pin 115, a commonly used crank mechanism is used. You can also use Furthermore, the forward/reverse rotation driving section 11 may be used by electrically rotating the motor in forward and reverse directions.

The reason why the housing 3 that holds the ferrule is rotated forward and backward at a rotation angle of at least 360 degrees as described above is that when rotated in only one direction, the optical fiber is twisted in that one direction. This is because it will cause it to break. Therefore,
If it is possible to rotate the entire optical fiber, the housing 3 holding the ferrule may be rotated in only one direction.

FIG. 6 is a diagram illustrating a drive mechanism for scanning the tapered member 9. Pre-tensioned spring 1
4, the stage 5 is urged to press against the tip of the head 15A of the micrometer type actuator 15. In this way, the movement of the stage 5 is restrained in position by the head 15A of the micrometer type actuator 15. By rotating the micrometer type actuator 15 forward and backward, the stage 5 can be moved left and right in FIG. 6 at a constant speed, and the projection 10 can be caused to scan the taper member 9. Here, a micrometer type actuator 15 is used as a driving mechanism for scanning.
Instead, the purpose can be sufficiently achieved by using a commonly used constant speed feeding mechanism using an air damper.

As explained above, the rough grinding machine shown in this embodiment has a structure that automatically makes a cut by following a minute taper when the ferrule is moved on the rough grinding wheel surface while pressing the ferrule end face. There is. Therefore, the desired shape of the end face of the optical fiber ferrule can be obtained by only scanning one stroke on the grinding wheel surface.

Thereafter, by performing final polishing of the ferrule end face using the final polishing machine shown in this embodiment, the rough finish polishing can be omitted and the ferrule end face can be polished into a convex spherical shape in two polishing steps.

Figure 7 shows an example of the external appearance of the polishing machine.
0 is a rough polishing machine, and 01 is a finishing polisher. Both can be carried and polished independently. In addition, the two can be easily combined by the connecting member 16 and can be carried and polished as one polishing machine.

By configuring such a rough polishing machine and a finish polishing machine as independent polishing machines, and also by combining them and using them as a single device,
The device is smaller and easier to handle.

Effects of the Invention As explained above, the optical fiber ferrule polishing machine of the present invention has the effect of polishing a single optical fiber ferrule with good reproducibility, high precision, high quality, and high work efficiency. The mechanical part has also been simplified. That is, in the optical fiber ferrule polishing machine according to the present invention, a rough-machined surface of a desired shape can be obtained by scanning the rough-machining grindstone surface once. Therefore, the rough finish polishing that was conventionally required can be omitted.

Furthermore, since the ferrule is rotated and its tip pressed against the polishing surface for polishing, a polished surface with excellent central symmetry can be obtained.

Therefore, the optical fiber ferrule polishing machine according to the present invention can be used in a wide range of fields.

[Brief explanation of drawings]

FIG. 1 is a perspective view including a partial cross section showing an embodiment of the optical fiber ferrule polishing machine of the present invention, and FIG. 2 is a diagram illustrating the notch of the ferrule end face during rough polishing. 3 is an explanatory diagram of final polishing, FIG. 4 is a diagram illustrating another example of a ferrule holder, FIG. 5 is a diagram illustrating a forward/reverse rotation drive mechanism, and FIG. FIG. 6 is a diagram explaining the scanning mechanism of the tapered member, FIG. 7 is an external view of the device, FIG. 8 is a configuration diagram of the ferrule part of the optical fiber connector, and FIG. 9 is a diagram illustrating the ferrule part of the optical fiber connector. FIG. 10 is a diagram illustrating a polishing operation of a conventional polishing device for polishing an end face into a spherical shape, and FIG. 10 is a schematic top view of the conventional polishing device;
FIG. 11 is a diagram showing a state in which a ferrule is attached to a conventional ferrule holder. Main reference numbers: 1...ferrule, 2...optical fiber, 3...housing, 4...chuck, 5
... Stage, 6 ... Parallel leaf spring, 7 ... Mounting block, 8 ... Support member, 9 ... Taper member, 1
0... Protrusion, 11... Forward/reverse rotation drive unit, 12...
... Drive belt, 13 ... Grindstone, 14 ... Tension spring, 15 ... Micrometer type actuator, 16 ... Abrasive supply nozzle, 17 ... Screw,
18... Drive shaft.

Claims (1)

[Scope of Claims] 1. A rotating shaft, a drive motor for driving the rotating shaft, a polishing means having a polishing surface attached to the rotating shaft, and a space capable of housing a ferrule to which an optical fiber is attached and fixed. It consists of a cylindrical first member and a second member that can be screwed together, and by inserting a ferrule into the first member and screwing the second member, the ferrule can be inserted into the ferrule so that the tip of the ferrule is a holding means for fixedly holding the holding means in a protruding state; a stage member for rotatably supporting the holding means so that the tip of the ferrule faces the polishing surface of the polishing means; and a rotational drive means for rotating the holding means. and supporting the stage member so as to be freely displaceable so that the tip of the ferrule can be pressed against the polishing surface of the polishing means, and with respect to the normal to the portion of the polishing surface against which the tip of the ferrule is pressed. , a stage mounting means in which the central axis of the ferrule is adjustable in angle; and a shifting means for applying a shifting force to the stage member so as to press the tip of the ferrule against the polishing surface of the polishing means. , a driven means fixed to the stage member; a tracing surface means that the driven means comes into contact with due to a deflecting force by the shifting means; a displacement means for displacing the tracing surface means relative to the tracing surface means, and as the tip of the driven means moves over the tracing surface means by the displacement means while abutting the tracing surface means, An optical fiber ferrule polishing machine characterized in that a tip of the ferrule supported by the stage member is pressed against the polishing surface and polished. 2. The tracing surface means has a first tracing surface parallel to the polishing surface that holds the tip of the ferrule before polishing process away from the polishing surface of the polishing means, and a first tracing surface that is parallel to the polishing surface of the ferrule before polishing process. a second tilting member whose tip end is brought into contact with the polishing surface of the polishing means, and is inclined so that the holding means gradually approaches the polishing surface according to relative displacement between the stage member and the tracing surface means; and a third tracing surface parallel to the polishing surface so as to stop the holding means from approaching the polishing surface, and the three tracing surfaces are provided in succession. An optical fiber ferrule polishing machine according to claim 1. 3. Claim 1, wherein the tracing surface means is fixed, and the stage mounting means is movable substantially parallel to a portion of the polishing surface against which the tip of the ferrule is pressed. The optical fiber ferrule polishing machine according to item 1 or 2. 4. The stage attachment means is attached to a support member that is rotatable about an axis perpendicular to the portion of the polishing surface against which the tip of the ferrule is pressed, and the support member is rotatable about the axis. Claims 1 to 3 are characterized in that, by the angular displacement, the stage mounting means is displaced substantially parallel to the portion of the polishing surface against which the tip of the ferrule is pressed. The optical fiber ferrule polishing machine according to any one of the above. 5. The displacement means includes a second displacement means that applies a displacement force in a direction of displacement of the stage member;
a micrometer-type actuator having a head that abuts the stage against the force of the shifting means, and by rotating the micrometer-type actuator, the head advances and retreats, and the stage mounting means The optical fiber ferrule polishing machine according to claim 3 or 4, wherein the tip of the ferrule is displaced substantially parallel to the portion of the polishing surface against which the tip is pressed. 6. The optical fiber ferrule polishing machine according to claim 5, wherein the second shifting means is a coil spring that pulls the stage member in the direction of displacement of the stage member. 7. A patent claim characterized in that the shifting means is a leaf spring that connects the stage member and the stage mounting means and exerts a spring force so as to press the stage member toward the polishing means. The optical fiber ferrule polishing machine according to any one of the ranges 1 to 6. 8. The optical fiber ferrule polishing machine according to claim 7, wherein the plate springs are a pair of parallel plate springs. 9 The first member of the holding means is a chuck having an opening into which the ferrule can be inserted and a plurality of vertical slits provided at the conical tip;
The member is a housing into which the first member can be screwed and has an opening through which the conical tip is inserted, and the chuck is inserted into the opening of the housing with the ferrule inserted into the opening of the chuck. Any one of claims 1 to 8, characterized in that the ferrules are fixedly held in a state in which the tips of the ferrules protrude by inserting the tips of the ferrules and screwing them together. The optical fiber ferrule polishing machine described. 10. The optical fiber ferrule polishing machine according to claim 9, wherein the housing is rotatably supported by the stage member via a ball bearing. 11. The optical fiber according to any one of claims 1 to 10, wherein the rotational drive means is a forward/reverse drive means that alternately rotates the holding means forward and reverse. Ferrule polishing machine. 12. The optical fiber ferrule polishing machine according to claim 11, wherein the forward/reverse driving means is a reversible electric motor. 13 The forward/reverse driving means includes a fixed internal gear;
a motor rotating a shaft located at the central axis of the fixed internal gear; a lever fixed to the shaft; a planetary gear that meshes with the fixed internal gear, a pin provided on a pitch circle of the planetary gear, and a rack that is supported so as to be linearly displaceable on the movement locus of the pin and driven by the pin;
12. The optical fiber ferrule polishing machine according to claim 11, further comprising a pinion that meshes with the rack and rotationally drives the holding means. 14. The method according to any one of claims 1 to 13, wherein the driven means is a protrusion extending from the stage member, the tip of which comes into contact with the tracing surface means. Optical fiber ferrule polishing machine. 15. The optical fiber feed according to claim 14, characterized in that a small roller is rotatably provided at the tip of the protrusion of the driven means, and the small roller comes into contact with the tracing surface means. Rule polishing machine. 16 The polishing means includes a rotating shaft perpendicular to the direction of displacement of the ferrule held by the holding means, a drive motor for driving the rotating shaft, and a polishing surface attached to the rotating shaft and having a polishing surface on the peripheral surface. An optical fiber ferrule polishing machine according to any one of claims 1 to 15, characterized in that the machine comprises a grindstone provided therein. 17 The polishing means includes a rotating shaft parallel to the displacement direction of the ferrule held by the holding means, a drive motor that drives the rotating shaft, a rotating plate attached to the rotating shaft, and the holding device. An abrasive-carrying sheet stretched on the rotary plate at right angles to the direction of displacement of the ferrule held by the means, and an abrasive-supplying means for supplying the abrasive to the abrasive-carrying sheet. An optical fiber ferrule polishing machine according to any one of claims 1 to 15.