JPS6341128B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for machining butt-type magnetic heads, particularly when the butt-type magnetic heads are arranged in a line with their gap centers aligned and the curved surface of the front part of the head is ground in this state. The present invention relates to a positioning method.

A butt-type magnetic head is usually one in which the head body is divided into a front part of the head facing the magnetic recording medium and a rear part of the head on the opposite side, and the necessary elements are assembled inside and then butt-joined. There are two types: one in which it is divided into two pieces at the center plane of the gap and then butted together, but here we are referring to the latter type in which the two bodies are butted together at the center plane of the gap. The front part of the magnetic head has a convex curved surface, and this surface is polished with a concave grindstone and lapped to give it a mirror finish. Conventionally, when grinding the front part of the head of such a butt-type magnetic head, positioning is performed based on the outer surface of one of the magnetic head halves, and the grinding is performed with the two magnetic head halves butted. was. In this method, if there is dimensional variation due to manufacturing errors in the thickness of the magnetic head half on the reference surface side, the center plane of the concave shaped grinding wheel and the center plane of the magnetic head, that is, the gap center plane, will be misaligned. , the curvature of the curved surface at the front of the head becomes distorted. Of course, it is also impossible to line up a plurality of magnetic heads of various types with different thicknesses in a row and grind them at the same time. However, if the jig is adjusted and positioned one by one during grinding, productivity will drop significantly.

The purpose of the present invention is to eliminate such problems,
The object of the present invention is to enable simultaneous grinding of the curved front surfaces of a large number of magnetic heads to a constant size, regardless of the thickness of the aforementioned magnetic head halves.

For this purpose, the processing method of the present invention involves making a partial cut on both sides of one abutting surface of the abutting type magnetic head which is divided into two at the center plane of the gap.
The magnetic head is positioned and fixed at this cut portion with reference to the other abutting surface, and the front portion of the magnetic head is ground in this state. In actual machining, a plurality of such butt-type magnetic heads are arranged in a line using a jig, and a plurality of them are simultaneously ground.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention in which actual grinding is performed using a jig will be described with reference to the drawings.

FIGS. 1a and 1b are diagrams showing a side view and a bottom view, respectively, of a butt-type magnetic head 1 applied to the present invention. Here, the convexly curved portion is referred to as the front portion 2 of the magnetic head 1, and the bottom portion on the opposite side is referred to as the rear portion 3. The abutting surfaces of the two halves 5, 6 of the magnetic head 1 divided at the gap center plane 4 are finished into flat surfaces by lapping or the like and then abutted against each other. Partial window edge-shaped notches 7 are formed on both sides of the abutting surface of one magnetic head half 5,
When the two halves 5 and 6 are joined at their abutting surfaces, a wedge-shaped recess is formed as shown in the figure. The abutting surface 8 of the other magnetic head half 6 appears in this recess. Note that such a cut portion does not necessarily have to be wedge-shaped as shown in the drawings, and for example, the abutting surface of the other half may be exposed by a square cut portion.

FIG. 2 is a perspective view of the above-described butt type magnetic head 1 mounted on a jig used to carry out the method of the present invention, and FIG. 3 is a top view thereof. Jig body 1
0, wedge-shaped locking claws 11, 12, 13, 14, . . . are formed at regular intervals in the longitudinal direction. One side 15 of each locking pawl is finished as a flat surface and lies within the same plane. These adjacent locking claws 11 and 12 and 1
3 and 14, etc., the abutting type magnetic head 1 shown in FIG. 1 is inserted by engaging it at the notch. In this case, the locking pawl is inserted so that its flat side 15 comes into contact with the abutting surface 8 of the other half 6 of the abutting type magnetic head 1. On the jig main body 10, a plurality of pushers 16 and push screws 17 are provided on the flat surface side of the locking claw along the longitudinal direction of the main body. The tip of the pressing screw 17 engages with the pusher 16, but in this case, as shown in FIG. It is better to connect them. When the pusher 16 is pressed against the magnetic head 1 by operating each of the pressing screws 17, each magnetic head 1 moves on the jig with reference to the abutting surface of the half body 6, that is, with reference to the center plane of the head gap. Locking claw 1
Positioned on one side 15 of 1 to 14. In addition,
When the magnetic head 1 is mounted on the jig, there may be some clearance between the notch and the locking pawl in the longitudinal direction of the jig. Rear part 3 of magnetic head 1
is supported by the jig main body 10, thereby determining the vertical head position.

After mounting the mating type magnetic head 1 on the jig as described above and fixing it with one abutting surface as a reference,
The front curved surface is ground (polished) using a molded rotary grindstone whose radial position is adjusted in advance. Even if the thickness from the abutting surface to the side surface of the magnetic head differs, the magnetic head 1 is always ground using the center of its head gap as a reference, so that all the multiple magnetic heads in series have the same curvature. Processed into the same shape. The magnetic head can be easily attached to and removed from the jig, making it possible to mass produce this type of magnetic head.

[Brief explanation of the drawing]

Figures 1a and b are side and bottom views of a butt-type magnetic head applied to the present invention, and Figure 2 is a partial view showing the state in which the magnetic head is mounted and positioned on a jig for carrying out the present invention. FIG. 3 is a partial plan view of FIG. 2. 1... Butt type magnetic head, 2... Front part, 4...
...Gap center plane, 5, 6...Magnetic head half,
7... Notch portion, 8... One abutment surface, 10...
... Jig main body, 11-14 ... Locking claw, 16 ... Pusher, 17 ... Pressing screw.

Claims (1)

[Claims] 1. In the processing method for a butt-type magnetic head that is divided into two parts at the center plane of the gap and butt-joined, a cut is made partially on both sides of one butt-face, and this cut is used to position the head with reference to the other butt-face. A method of machining a butt type magnetic head, characterized in that the front part of the magnetic head is ground.