JPS624767B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for polishing a tape running surface of a magnetic head.

Conventionally, a device for polishing the tape running surface of a magnetic head is a chuck that holds the magnetic head with the tape running surface facing downward while supplying lapping agent onto a cylindrical concave lap surface plate. The lapping surface plate was polished by rotating the lapping plate and applying contact pressure to the lapping surface plate using a weight. However, the rapping agent that polishes the tape running surface of the magnetic head migrates to the concave central part of the surface plate and remains there, making it impossible to uniformly polish the tape running surface of the magnetic head on the surface plate. It was difficult and difficult to finish with high precision. Furthermore, since a wrapping agent is used, the wrapping agent must be frequently replaced with a new one, making work management difficult and requiring a considerable number of man-hours.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic head tape running surface polishing device which eliminates the above-mentioned conventional drawbacks, significantly improves polishing accuracy, and significantly improves workability and reduces the number of work steps. That is, the present invention provides means for sequentially supplying and moving a long abrasive tape with abrasive grains attached thereto using a reel or the like, and a magnetic head is applied to the surface of the abrasive tape moved by the means. The abrasive tape is fed by providing a means for pressing the circular arc tape running surface with uniform pressure using an elastic body or air pressure, making it oscillate according to the curvature of the circular arc surface, and reciprocating in the axial direction of the circular arc surface. As a result, new parts are sequentially provided, and the tape running surface of the magnetic head is uniformly polished by being used uniformly over the entire area, and workability is also significantly improved. It is something. In addition, since an elastic tape is interposed behind the abrasive tape and moved together with the abrasive tape, it is possible to polish with a convex curvature in the axial direction of the arcuate surface of the magnetic head. , the magnetic tape is in complete contact with the magnetic head, allowing the magnetic head to perform excellent recording and reproducing.

The present invention will be explained below based on embodiments shown in the drawings. Fig. 1 is a front view showing an embodiment of the tape running surface polishing device of the present invention, Fig. 2 is a side view of Fig. 1, and Fig. 3 is a cross-sectional view showing an enlarged magnetic head portion of Fig. 2. It is a diagram. That is, 1 is a magnetic head whose bottom is connected together and divided by a large number of cutting grooves 2, for example, several dozen, and whose tape running surface 3 at the tip is ground into an arc shape. The cutting grooves 2 of the magnetic head 1 are filled with resin to prevent each element from collapsing, and the running surface of the tape is slightly wiped off and recessed. The magnetic head 1 is fixed to the block 4 by adhesive with its side surface positioned by positioning means such as a surface plate. Reference numeral 5 denotes a holding jig for holding the block 4, which is fixed to one end of a shaft 8 rotatably and slidably supported by a bearing 7 attached to a frame 6. This holding jig 5 is formed with a groove 9 into which the width of the block 4 is tightly inserted, and a plate 11 having an elastic body 10 such as a spring fixed thereto is fixed to the bottom of the groove 9. Furthermore, a spring lever 13 is rotatably supported on the holding jig 5 around a pin 14. In Fig. 1, when trying to put the block 4 into the groove 9, first rotate the spring lever 13 until the longitudinal direction is horizontal, then install the block 4 into the groove 9, and then turn the spring lever 13 in the vertical direction. When the spring lever 13 is rotated to the cam 15, the spring lever 13 is deformed along the cam 15, and the block 4 is pressed so that it does not come out forward. Reference numeral 16 denotes an eccentric cam that fits vertically into the flange portion of the shaft 8, and is directly connected to the motor 17. 18 is the flange part of the shaft 8 and the frame 6
A coil spring installed between the shaft 8 and the shaft 8 is configured to press the shaft 8 rightward in FIG. 2 to bring the flange portion into contact with the eccentric cam 16. 19
is a link rotatably supported by a bearing 20, and is slidably fitted to the other end of the shaft 8 using a spline, key, or the like. 21 is a motor, 22 is a link whose one end is fixed to the output shaft of this motor 21, and 23 is a link which rotatably connects the other end of this link 22 and the other end of the link 19 with each pin. be. However, when the motor 21 is driven to rotate, the link 19 is configured to swing. A tape guide roller 24 is rotatably supported by an arm 25 at a position facing the tape running surface 3 of the magnetic head 1. The arm 25 is swingably supported around a pin 26 as a fulcrum,
A spring 29 whose tip end is connected to the piston rod of the air cylinder 27 and whose pressure can be adjusted by an adjustment screw 28, and an adjustable stopper 30 are installed. 31 is
This is an abrasive tape supply reel in which an abrasive tape 32 with C#6000 abrasive grains attached is wound around a 0.025 mm thick film. Reference numeral 33 denotes an elastic tape supply reel containing an elastic tape 34 made of a synthetic resin film or the like (double-sided adhesive tape) having a thickness of about 0.1 to 0.3 mm. 35 is a take-up reel for winding up the abrasive tape 32 and elastic tape 34 together.

Next, the operation will be explained. That is, first, the cylinder 27 is activated to raise the arm 25, the block 4 to which the magnetic head 1 to be polished is adhesively fixed is made and inserted into the groove 9, and the spring lever 13 is turned vertically to prevent it from moving forward. Set it as follows. Next, a film-like abrasive tape 32 with C#6000 abrasive grains attached to one side and an elastic tape 34 made of synthetic resin or rubber material are loosened from the supply reels 31 and 33, respectively, and the tape guide roller 24 is loosened. Wound around the take-up reel 35 through the
suspend. However, the abrasive tape 32 is located on the lower side, and the elastic tape 34 is located on the upper side, so that they are guided by the tape guide roller 24.

Next, the cylinder 27 is returned to its original position, and the tape guide roller 24 is displaced downward by its own weight to apply a pressing force. At this time, by slightly moving the adjustment screw 28, the pressure of the spring 29 can be adjusted to adjust the above-mentioned pressing force.

Next, receiving the detected rotational speed signal from a rotary encoder (not shown) connected to the tape guide roller 24, the rotational speed of a motor (not shown) that rotationally drives the take-up reel 35 is controlled.
The rotation speed of the tape guide roller 29 is kept constant, and the abrasive tape 32 and the elastic tape 34 are run together at a constant speed.

Next, drive the motors 17 and 21 to drive the eccentric cam 1.
6 reciprocates the holding jig 5 in the axial direction of the arcuate surface of the magnetic head 1, and swings the holding jig 5 about the shaft 8 to remove the arcuate tape of the magnetic head 1. The running surface 3 is polished into an arc shape, and as shown in FIG. 3, the elastic tape 34 is made to protrude through the gap in the part corresponding to the cutting groove 2, and is recessed and deformed into a wave shape in the part of the magnetic head. It is possible to polish the arcuate surface so that it has a convex curvature in the axial direction, and it is possible to polish the tape running surface 3 of the magnetic head 1 by making it protrude spherically. However, the center of the tape running surface 3 of the magnetic head 1 has a protruding shape and comes into complete close contact with the magnetic tape, providing excellent reading and reproducing characteristics.

Further, since the block 4 is supported by the holding jig 5 so as to be pressed upward by an elastic body or air pressure, uneven contact with the polishing tape 32 can be prevented and uniform contact can be obtained. In addition, since the magnetic head 1 is moved back and forth in the front and rear directions by the eccentric cam 16, a uniform polishing finish can be obtained from one end of a large number of magnetic heads to the other in the longitudinal direction.

As explained above, according to the present invention, a large number of magnetic heads can be uniformly polished and the yield can be improved to 99%.
Furthermore, according to the present invention, new parts of the abrasive tape are automatically fed at a constant speed, which improves work efficiency and eliminates fluctuations, significantly improving efficiency. This has the effect that a magnetic head with excellent characteristics can be obtained by eliminating variations caused by the magnetic head.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of a magnetic head tape running surface polishing apparatus according to the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 is an enlarged view of the magnetic head portion of FIG. 2. FIG. Explanation of symbols 1...Magnetic head, 2...Cutting groove, 3...Tape running surface (arc surface), 4...Block, 5...Holding jig, 9...Groove, 8...Shaft, 1
0...Spring, 16...Eccentric cam, 17,2
1... Motor, 19, 22, 23... Link, 2
4... Tape guide roller, 31... Abrasive tape supply reel, 32... Abrasive tape, 33... Elastic tape supply reel, 34... Elastic tape, 35...
...Take-up reel.

Claims (1)

[Claims] 1. In a tape running surface polishing device for a magnetic head that polishes the arcuate tape running surface of a magnetic head that is individually divided by cutting grooves, a long length of abrasive tape is opposed to the tape running surface by a guide roller. means for causing the abrasive tape to run together with the abrasive tape by interposing a long elastic tape between the guide roller and the abrasive tape; a holding means having a block supported by an elastic body so that the running surface is pressed uniformly; and the holding means is oscillated in accordance with the arcuate curvature of the tape running surface, and also linearly reciprocated in the direction of the arc axis. and a means for moving the tape, and polishing the tape running surface in a circular arc running direction and convexly polishing it in a circular arc axis direction, thereby protruding the tape running surface into a spherical shape. Head tape running surface polishing device.