JP3179723B2 - Micro hole grinding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a micro-hole grinding apparatus for grinding an inner surface of a micro-hole of a workpiece,
The present invention relates to a micro-hole grinding device for grinding an optical fiber insertion hole of a ferrule which is a component part of an optical fiber connector.

[0002]

2. Description of the Related Art In recent years, with the advent of multimedia,
BACKGROUND ART The development of optical communication technology using an optical fiber that is advantageous for large capacity and high speed is expected, and the demand for a ferrule used as a main connector component of the optical fiber is increasing.

[0003] The ferrule is made of, for example, a zirconia ceramic material, and a fiber insertion hole is formed in the ferrule in the axial direction, and an optical fiber is inserted and held and fixed in the fiber insertion hole.

Conventionally, an apparatus having a structure as shown in FIG. 6 has been known as a microhole grinding apparatus for grinding a fiber insertion hole of this kind. This device has a tapered wire 1,
The tapered wire 1 is wound around a wire feeder 2. A pair of wire feed rollers 3, which are in slidable contact with the tapered wire 1, are provided in the winding path of the tapered wire 1. A main shaft 4 is disposed in the wire straight portion of the tapered wire 1, and a plurality of ferrules W are set in the main shaft 4.

In the vicinity of one end of the main shaft 4, a wire passing portion 5 for guiding the distal end of the tapered wire 1 to the fiber insertion holes of the plurality of ferrules W in the main shaft 4 is provided.
An optical sensor 6 for detecting the downward bending of the taper wire 1 is provided on the taper wire 1 located further upstream. Also,
At the other end of the main shaft 4, a wire take-up portion 7 for winding the tapered wire 1 after grinding the fiber insertion hole is provided.

As shown in FIG. 7, the optical sensor 6 has a body 6b fixed to the lower end of a support rod 6a, and a pair of legs 6c projecting below the lower surface of the body 6b. The light receiving element 6d and the light projecting element 6e are mounted on the inside of the inside so as to face each other.

In this apparatus, when grinding the fiber insertion hole of the ferrule W, first, the tapered wire 1 is guided by the wire feed rollers 3, and the tapered wire 1 is further guided by the wire passing portion 5 to a plurality of ferrules in the main shaft 4. After passing through the W fiber insertion hole, the tapered wire 1 is wound around the wire winding section 7 while rotating the main shaft 4 in the circumferential direction and swinging in the axial direction. At that time, when diamond powder is supplied to the tapered wire 1 and the tapered wire 1 is fed at a constant speed, a plurality of fiber insertion holes are ground on the outer peripheral surface of the tapered wire 1.

In grinding the fiber insertion hole,
When the taper wire 1 is inserted into the fiber insertion hole, if the processing accuracy of the fiber insertion hole is poor or if processing dust is attached to the fiber insertion hole, the taper wire 1 cannot be smoothly inserted into the fiber insertion hole. For this reason, the tapered wire 1 is bent, and this bending is detected by the optical sensor 6, and a defect is detected as in the tapered wire 1.

That is, the tapered wire 1 is inserted between the legs 6c of the optical sensor 6, and when the downward bending of the tapered wire 1 blocks the light beam between the light receiving element 6d and the light projecting element 6e, the tapered wire 1 is inserted. A defect is detected.

[0010]

However, since the optical sensor 6 can detect only the bending of the tapered wire 1 in one direction, in this case, downward in the structure, the optical sensor 6 bends in a direction other than the downward direction of the tapered wire 1. Is not detected, and the problem is not reliably detected as in the tapered wire 1.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a micro-hole grinding apparatus capable of reliably detecting a defect along a tapered wire. It is in.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0013]

In order to achieve the above object,
According to the present invention, a plurality of workpieces are inserted in a line, a main shaft which rotates in the circumferential direction and swings in an axial direction of the plurality of workpieces, and micro holes of the plurality of workpieces in the main spindle. Wire feeding means for feeding the tapered wire to the workpiece, wire passing means for passing the tapered wire through the fine holes of the plurality of workpieces in the spindle, and winding the tapered wire through the plurality of workpieces in the spindle. Means for winding the tapered wire through the micro holes of the plurality of workpieces, and winding the tapered wire in the axial direction of the workpiece while the tapered wire is wound on the outer peripheral surface of the tapered wire. In the micro-hole grinding apparatus for grinding the micro-holes, a wire passage detecting circuit for detecting the degree of the taper wire passing through the micro-holes between the wire passing means and the wire feed means. Wherein the wire-through detection circuit detects a conductive annular detector surrounding the tapered wire in a circumferential direction, a power supply for applying a voltage to the taper wire and the annular detector, and a current of the wire-through detection circuit. When the taper wire is bent and comes into contact with the annular detecting body, the current detector detects the current of the detection circuit along the wire, and detects a defect along the taper wire. .

[0014] Further, there is provided a wire feed stop means for stopping the feed of the taper wire to the minute hole of the workpiece by the wire feed means when the wire feed detecting circuit detects a defect of the tapered wire. It is characterized by:

Therefore, in the present invention, a plurality of workpieces are inserted in a row in the main spindle, and the plurality of workpieces are supplied into the main spindle. Then, the tip of the tapered wire sent out from the wire feeding means is inserted into the fine holes of the plurality of workpieces by the wire passing means, and the main shaft is rotated in the circumferential direction of the plurality of workpieces and rocked in the axial direction, While the taper wire is wound by the wire winding means, minute holes of a plurality of workpieces are ground on the outer peripheral surface of the taper wire.

If the tip of the tapered wire is not smoothly inserted into the micro holes of a plurality of workpieces, the tapered wire bends and comes into contact with the ring-shaped detection body, and a current flows through the detection circuit through the wire. And a defect is detected as in the tapered wire. In this case, since the deflection of the tapered wire in any direction is detected by the annular detecting body, the defect is reliably detected as in the tapered wire.

When a defect is detected along the tapered wire, the feed of the tapered wire to the minute hole of the workpiece by the wire feeding means is stopped by the wire feeding stopping means.

Further, after the wire feed means is reversed to return the taper wire to the state before bending, the taper wire is fed again.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. In describing the embodiments, those having the same functions as those of the conventional example will be denoted by the same reference numerals.

FIG. 1 is a schematic configuration diagram of a micro-hole grinding apparatus according to one embodiment of the present invention, and FIG. 2 is a circuit diagram of a wire-through detection circuit of the micro-hole grinding apparatus according to one embodiment of the present invention. FIG. 3 is a diagram showing a relationship between an annular detector and a tapered wire of the micro-hole grinding device according to one embodiment of the present invention.
FIGS. 5A to 5D are block diagrams of a wire feed stop portion of the micro-hole grinding device according to the embodiment of the present invention. FIGS. It is a figure showing the contact state of a sensing object and a taper wire.

The micro-hole grinding apparatus shown in FIG. 1 comprises a main shaft 4 which holds and arranges a plurality of ferrules W in a line, rotates in a circumferential direction and swings in an axial direction, and a plurality of ferrules W in the main shaft 4.
A wire feed portion 2 for feeding the tapered wire 1 to the fiber insertion hole, a wire passing portion 5 for passing the tapered wire 1 through the fiber insertion holes of the plurality of ferrules W in the main shaft 4, and a fiber insertion hole of the plurality of ferrules W in the main shaft 4 A wire winding section 7 for winding the tapered wire 1 through which the taper wire 1 is inserted, and the taper wire 1 disposed between the wire passing section 5 and the wire feeding section 2
Wire detection circuit 8 for detecting the degree of passage to the micro holes
It is composed of

The main shaft 4 is formed in a cylindrical shape, rotates in the circumferential direction and swings in the axial direction, and has a plurality of ferrules W arranged at a central portion thereof in a line at predetermined intervals. Are individually clamped.

The wire feeder 2 has a reel around which the taper wire 1 is wound, and a pair of wire feed rollers 3, 3 is arranged in the middle of the taper wire 1 near the wire feeder 2, and these wire feeders are arranged. The tapered wire 1 slides between the rollers 3, 3, and the tapered wire 1 is sequentially guided to the fiber insertion holes of the plurality of ferrules W in the main shaft 4.

The wire passing portion 5 is composed of a transport gripper or the like, and grasps the distal end of the tapered wire 1 with the transport gripper and guides the tapered wire 1 to the fiber insertion hole of the ferrule W in the main shaft 4.

The wire winding section 7 is connected to a winding motor (not shown), and is configured to wind the tapered wire 1.

As shown in FIG. 2, the wire passing detection circuit 8 applies a voltage to the conductive annular detector 9 (see FIG. 3) surrounding the taper wire 1 in the circumferential direction, and applies a voltage to the taper wire 1 and the annular detector 9. Power supply 10 and a photocoupler (current detector) 11 for detecting the current of the wire passing detection circuit 8
And a resistor 12.

The wire feeder 2 stops feeding of the tapered wire 1 to the minute hole of the workpiece W by the wire feeder 2 when the wire feeder 2 detects a defect in the tapered wire 1. A feed stop unit 13 is provided. The wire feed stop unit 13 includes a servo driver 14 and a servo driver 1 that drive the wire feed unit 2.
4 (see FIG. 4).

Since the microhole grinding apparatus is configured as described above, when grinding the fiber insertion hole of the ferrule W, first, a plurality of ferrules W are inserted into the main shaft 4. When the plurality of ferrules W are inserted into the main shaft 4, the plurality of ferrules W are individually clamped in the main shaft 4.

Next, the taper wire 1 is fed from the wire feeder 2.
Of the taper wire 1 is slid between the wire feed rollers 3 and 3 and sequentially guided into the fiber insertion holes of the plurality of ferrules W in the main shaft 4. Then, the tapered wire 1 is guided and inserted into the fiber insertion hole of the ferrule W by the wire passing portion 5.

Thereafter, the main shaft 4 is rotated in the circumferential direction and oscillated in the axial direction, and the tapered wire 1 upstream of the main shaft 4 is rotated.
While supplying diamond powder to the taper wire 1
Is wound around the wire winding section 7 and a plurality of ferrules W
Are simultaneously ground on the outer peripheral surface of the tapered wire 1.

When the tapered wire 1 is inserted into the fiber insertion hole of the ferrule W and the tip of the tapered wire 1 is not smoothly inserted into the micro holes of the plurality of workpieces W, the tapered wire 1 bends and comes into contact with the annular detector 9, The wire passing detection circuit 8 is closed. As a result, the photocoupler 11 detects the current of the wire passing detection circuit 8, and detects a failure as in the tapered wire 1.

In this case, the annular detector 9 is formed by the tapered wire 1
In the circumferential direction, the deflection of the tapered wire 1 in any direction is detected (see FIG. 5),
As described above, a defect can be reliably detected.

Further, when a fault is detected by the wire-through detecting circuit 8 along the tapered wire 1, the tapered wire 1 is detected.
As described above, the malfunction is fed back to the controller 15, the servo driver 14 is controlled by the controller 15, and the feeding of the taper wire 1 to the fiber insertion hole of the ferrule W by the wire feeding unit 2 is stopped.

Further, after the wire feeding section 2 is reversed and the taper wire 1 is returned to the state before being bent, the taper wire 1 is sent again.

As mentioned above, the micro-hole grinding apparatus according to the embodiment of the present invention has been described in detail. However, the present invention is not limited to the micro-hole grinding apparatus described in the above-described embodiment, and the scope of the present invention is not limited thereto. Various modifications can be made in the design without departing from the spirit of the invention described in (1).

[0036]

As will be understood from the above description, according to the micro-hole grinding apparatus of the present invention, the wire passing through the wire passing means and the wire feeding means for detecting the state of the tapered wire passing through the micro-holes. A detection circuit is provided, the wire-through detection circuit detects a conductive annular detector surrounding the tapered wire in the circumferential direction, a power supply for applying a voltage to the taper wire and the annular detector, and a current of the wire-through detection circuit. When the tip of the taper wire is not inserted smoothly into the micro holes of multiple workpieces, the taper wire flexes and comes into contact with the annular detector, and the current flows through the wire detection circuit. The fault is detected by the detector and the taper wire is detected. In this case, since the deflection of the tapered wire in any direction is detected by the annular detector, it is possible to reliably detect a defect as in the tapered wire.

Further, since the wire feed stopping means for stopping the feed of the tapered wire to the minute hole of the workpiece by the wire feeding means is provided, the wire feed is stopped when the wire feed detecting circuit detects a taper wire passing failure. By this means, the feed of the tapered wire to the minute hole of the workpiece can be stopped.

Further, by reversing the wire feeding means, the tapered wire 1 can be fed again after returning the tapered wire to the state before bending.

Thus, the apparatus can be automated.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a micro-hole grinding device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of a through-wire detection circuit of the micro-hole grinding device according to one embodiment of the present invention.

FIG. 3 is a diagram showing a relationship between an annular detector and a tapered wire of the micro-hole grinding device according to one embodiment of the present invention.

FIG. 4 is a block diagram of a wire feed stop unit of the micro-hole grinding device according to one embodiment of the present invention.

5 (a) to 5 (d) are views showing a contact state between an annular detector and a tapered wire of a micro-hole grinding apparatus according to an embodiment of the present invention.

FIG. 6 is a schematic configuration diagram of a conventional micro-hole grinding device.

FIG. 7 is an explanatory diagram of an optical sensor of a conventional micro-hole grinding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Taper wire 2 Wire feed part 3 Wire feed roller 4 Main shaft 5 Wire passing part 6 Optical sensor 7 Wire winding part 8 Wire passage detection circuit 9 Ring detector 10 Power supply 11 Photocoupler 12 Resistance 13 Wire feed stop part 14 Servo driver 15 Controller W Ferrule

Claims (2)

(57) [Claims] A plurality of workpieces are inserted in a line, and a main shaft that rotates in the circumferential direction and swings in the axial direction of the plurality of workpieces, and a minute one of the plurality of workpieces in the main spindle. A wire feeding means for sending the tapered wire through the hole, a wire passing means for passing the tapered wire through the fine holes of the plurality of workpieces in the spindle, and the taper wire passing the plurality of workpieces in the spindle. A winding means for winding the tapered wire through the micro holes of the plurality of workpieces, and winding the tapered wire in the axial direction of the workpiece while processing the tapered wire by the outer peripheral surface of the tapered wire. In a micro-hole grinding apparatus for grinding micro-holes in an object, a wire-through detection is provided between the wire passing means and the wire feed means to detect a state of the tapered wire passing through the micro-holes. A circuit, a wire-like detection circuit, a conductive annular detector surrounding the taper wire in the circumferential direction, a power supply for applying a voltage to the taper wire and the annular detector, and a current of the wire-like detection circuit. A current detector for detecting, when the taper wire is bent and contacts the annular detector, the current detector detects the current of the detection circuit as the wire, and detects a defect as the taper wire. Micro-hole grinding device. 2. A wire feed stop means for stopping the feed of said taper wire to said minute hole of said workpiece by said wire feed means when said wire feed detection circuit detects a fault of said taper wire. The micro-hole grinding device according to claim 1, wherein: