JPH0528448A - Head mounting mechanism for rotary head device - Google Patents

Abstract

PURPOSE:To obtain the head mounting mechanism for a rotary head device capable of adjusting the height position of a magnetic head with simple work and with high accuracy. CONSTITUTION:A semispherical projecting part 2 is formed on the attaching face of a rotary drum 3, and a recessed part 4 is formed on a head base 5. An adhesive material is applied between both parts, before the adhesive material is cured, the head base 5 is moved to the radial direction of the rotary drum 3 by sliding between the recessed part 4 and the projecting part 2, further, is inclinded by making the contact part of the vertex, etc., of the projecting part 2 with the bottom face of the recessed part 4 as a fulrum, thus, the projecting amount and the height of the above-mentioned magnetic head are adjusted. By curing the adhesive material at this state, the head base 5 is adhered and fixed surely. Further, since the adhesive material is accumulated in the recessed part 4, no excess adhesive material flows out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head mounting mechanism of a rotary head device used for DAT or the like, and a rotation in which a position of a magnetic head can be easily adjusted and a stress of a mounting force does not act on a head base. The present invention relates to a head mounting mechanism of a head device.

[0002]

2. Description of the Related Art FIG. 8 is a sectional view showing the structure of a conventional rotary head device. In the rotary head device shown in FIG. 8, the shaft 22 is fixed to the center of the fixed drum 21 by means such as shrink fitting or press fitting. A pair of bearings 24 and 25 are mounted on the rotary drum 23, and the rotary drum 23 is rotatably supported by the shaft 22 by the bearings 24 and 25. In addition, a protrusion is formed at the center of the fixed drum 21,
The upper surface thereof serves as the reference surface 21a, and the lower bearing 25
The lower edge of the inner ring 25a is positioned and installed on the reference surface 21a via a shim (not shown) as necessary. A sleeve 27, which also functions as a preloading member, is fixed to the upper end of the shaft 22 with a screw 28. Lower edge 2 of sleeve 27
7a is fixed in a state of pressing the inner ring 24a of the upper bearing 24, whereby a preload in the thrust direction is applied to the upper and lower bearings 24 and 25. In addition, a ring-shaped installation surface 21b is formed on the upper surface of the fixed drum 21, and the fixed-side transformer 34 is bonded onto this.

A head base 31 is fixed to the lower surface of the rotary drum 23 by a mounting screw 32, and a magnetic head H is fixed to the upper surface of the tip of the head base 31. An adjusting screw 33 is screwed onto the rotary drum 23 from above.

A shim is interposed between the head base 31 and the rotary drum 23 as needed. A fixed-side transformer 34 is adhered and fixed to the upper end of the fixed drum 21, and a rotational-side transformer 35 is adhered and fixed to the lower surface of the protruding portion 23a of the rotary drum 23.

The yoke 3 is provided on the upper surface of the rotary drum 23.
A rotor magnet 37 is fixed via 6 and a fixed yoke 38 is fixed to the sleeve 27 by screws 41, and a stator coil 39 is fixed to the fixed yoke 38. Rotor magnet 37 and stator coil 39
The rotary drum 23 is rotationally driven by the power of the motor configured by.

In the rotary head device described above, the rotary drum 23, the head base 31, the mounting screw 32, and the adjusting screw 33 constitute a mounting mechanism for the magnetic head H. The position of the magnetic head H is adjusted by attaching the rotary drum 23 and the head base 31 to an adjustment stand (not shown) with a monitor.

First, the mounting screw 32 is loosened slightly, and the head base 31 is moved in the direction of the arrow X shown while observing the monitor to adjust the protrusion amount of the magnetic head H. afterwards,
The head base 31 is fixed by tightening the mounting screw 32. Next, the adjustment screw 33 is tightened or loosened, and the head base 31 is elastically displaced in the direction of the arrow Y in the figure by the amount of advance or retreat. As a result, the magnetic head H
Adjust the protruding amount and height position of. The position adjustment of these magnetic heads H is performed in order to eliminate the difference in protrusion and height difference between the gaps of the plurality of magnetic heads H.

[0008]

However, in the rotary head device having the above structure, the position adjustment of the magnetic head H is performed twice as described above, which is a complicated task. In adjusting the height of the magnetic head H, the tightening direction of the mounting screw 32 and the adjusting screw 33 are adjusted.
Since the tightening directions of 2 are opposite to each other, a large stress acts on the head base 31 by the adjusting work. Therefore, if the amount of tightening by the adjusting screw 33 is too large, the head H moves in the Y direction due to the loosening of the adjusting screw 33 due to the stress after the adjustment work is completed, and the height dimension becomes out of the allowable value. In the worst case, there is a problem that the adjustment work has to be performed again.

The present invention solves the above-mentioned problems of the prior art. The position of the magnetic head can be easily adjusted with high precision, and the head is mounted in a rotary head device in which no stress acts on the head base. The purpose is to provide a mechanism.

[0010]

According to the present invention, there is provided a head mounting mechanism for a rotary head device in which a head base on which a magnetic head is mounted is mounted on a rotary drum. Either the mounting surface of the rotary drum or the head base. A protrusion is formed on one side, and a concave portion extending in the radial direction of the rotary drum is formed on the other side. The head base is movable and adjustable in the radial direction of the rotary drum by fitting the protrusion and the concave portion together, and the protrusion is a fulcrum. The head base is adjustable in inclination with respect to the mounting surface of the rotary drum, and the head base and the rotary drum are fixed by an adhesive filled in the recess. ..

[0011]

In the above means, for example, an adhesive is applied between the rotary drum and the head base and in the recess, and the protrusion and the recess are fitted together, and the head base is attached to the rotary drum. Before the adhesive is hardened, the head base is moved in the radial direction of the rotary drum by sliding between the concave portion and the protruding portion, and the head base is inclined with the protruding portion as a fulcrum, whereby the magnetic head is projected. Adjust quantity and height. The head base is surely adhered and fixed by curing the adhesive in that state. In addition, since the adhesive agent collects in the recess, excess adhesive agent does not flow out.

[0012]

Embodiments of the present invention will be described with reference to the drawings.
1 is a sectional view showing a rotary head device to which a head mounting mechanism according to an embodiment of the present invention is applied, FIG. 2 is a partially enlarged sectional view showing the head mounting mechanism, and FIG. 3 shows a head base mounting surface side of a rotary drum. 4 is an enlarged perspective view of the head base, FIG. 5 is a sectional view taken along line AA in FIG. 4, and FIG.
FIG. 6 is a sectional view taken along line BB in In this embodiment, the same members as those of the rotary head device shown in FIG. 8 are designated by the same reference numerals and detailed description thereof will be omitted. In the rotary head device shown in FIG. 1, the head mounting mechanism is roughly composed of a rotary drum 3 and a head base 5 mounted on the head base mounting surface side of the rotary drum.

As shown in FIG. 3, on the side of the head drum mounting surface of the rotary drum 3, a shallow groove 1 in which an adhesive is stored is formed.
And a hemispherical protrusion 2 protruding from the inside of the groove 1. The protrusion 2 has, for example, a tolerance of 0 mm to +0.0 with respect to the reference dimension C mm in the outer diameter D1.
It is formed to about 1 mm.

As shown in FIG. 4, the magnetic head H is adhesively fixed to the lower surface of the head base 5. Head base 5
On the upper surface of the figure, a recess 4 is provided, into which the protrusion 2 can be fitted, and which is elongated in the radial direction of the rotary drum 3. The recess 4 has, for example, a tolerance of -0.01 to 0.0 with respect to a reference dimension Cmm having a width D2.
It is formed to have a thickness of about 03 mm.

As described above, since the outer diameter of the protrusion 2 is a plus tolerance with respect to the reference dimension C and the width of the recess 4 is a minus tolerance with respect to the reference dimension, the protrusion 2 is formed. It is fitted in the recess 4 without rattling in the width D2 direction.

Further, as shown in FIG. 2, with the protrusion 2 fitted in the recess 4, a minute gap G is formed between the mounting surface of the rotary drum 3 and the head base. As a result, the head base 5 can be tilted about the contact point between the apex of the protrusion 2 and the bottom surface of the recess 4 as a fulcrum.
Further, the head base 5 is movable in the radial direction of the rotary drum 3 with the protrusion 2 as a guide in a state where the protrusion 2 is fitted.

The adhesive has a viscosity of 8000.
cps to 12000 cps, anaerobic reactivity, initial adhesive strength (strength that the adherend does not move with a slight force) achievement time 35 seconds to 45 seconds, curing shrinkage amount -2 μm to +2 μm, and heat shock strength under high temperature and high humidity conditions It is desirable that the decrease is small. In this embodiment, the product name (product number) “Chemitec 4 × 287” manufactured by Chemitech Co., Ltd. is used.

Next, the method of mounting the head base and the method of adjusting the head position having the above-mentioned structure will be described with reference to FIG. First, the head base 5 is clamped on an adjustment stand (not shown) with a monitor. Next, an adhesive is applied to the inside of the concave portion 4 (or the protruding portion 2), and the protruding portion 2 is fitted into the concave portion 4. After that, while watching the monitor, the head base 5 is moved in the radial direction of the rotary drum 3 (direction of arrow X) using the protrusion 2 as a guide to adjust the protrusion amount. Further, the head base 5 is tilted with a point, such as the apex or side surface of the protrusion 2 that is in contact with the recess 4 as a fulcrum, to adjust the height direction of the magnetic head H (direction of arrow Y). .. After the adjustment is completed, the adhesive (Chemtech 4 × 287) is cured to complete the work of attaching the head base 5. At this time, since an adhesive having a curing shrinkage amount of about −2 μm to +2 μm is used, the height dimension after curing does not exceed the allowable value.

As described in detail above, according to the above embodiment,
By applying an adhesive agent to the protrusion 2 and then fitting the protrusion 2 into the recess 4 and moving the head base 5 in the radial direction and the vertical direction of the rotary drum 3, the position of the magnetic head H ( The amount of protrusion and the height position) can be adjusted with a single operation and with high accuracy. Then, the head base is surely adhered and fixed by curing the adhesive in that state. It should be noted that, conversely to the above-described embodiment, the rotary drum 3 may be provided with a recess and the head base 5 may be provided with a protrusion.

Further, as an adhesive, the initial strength achievement time,
As long as it meets various conditions such as the amount of curing shrinkage, it is not limited to an anaerobic reactive one, and may be an ultraviolet reactive one, for example. Further, the shapes of the protrusion 2 and the recess 4 can be variously modified as long as the head base 5 can be moved in the radial direction and the vertical direction of the rotary drum 3, and for example, as shown in FIG. Alternatively, the columnar protrusion 2a and the rectangular parallelepiped recess 4a may be combined. Even in this case, similarly to the above, the position adjustment of the magnetic head H can be performed with a simple operation and with high accuracy.

[0021]

As described above, according to the present invention, it is possible to adjust the position of the magnetic head with a simple operation and with high accuracy, and to attach the head of the rotary head device in which the head position is not displaced after the adjustment. A mechanism can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view showing a rotary head device to which a head mounting mechanism according to an embodiment of the present invention is applied.

FIG. 2 is a partially enlarged sectional view showing a head mounting mechanism.

FIG. 3 is a partially enlarged view showing a head base mounting surface side of a rotary drum.

FIG. 4 is an enlarged perspective view of a head base.

5 is a cross-sectional view taken along the line AA in FIG.

6 is a sectional view taken along line BB in FIG.

FIG. 7 is a perspective view showing a modified example of the shapes of a protrusion and a recess.

FIG. 8 is a cross-sectional view showing the structure of a conventional rotary head device.

[Explanation of symbols]

 1 Groove 2 Projection 3 Rotating Drum 4 Recess 5 Head Base H Magnetic Head

Claims (1)

Claim: What is claimed is: 1. A head mounting mechanism of a rotary head device in which a head base on which a magnetic head is mounted is mounted on a rotary drum, wherein either the mounting surface of the rotary drum or the head base is mounted. The protrusion is formed on the other side, and the other side is formed with a recess extending in the radial direction of the rotating drum. The head base is movable and adjustable in the radial direction of the rotating drum by fitting the protrusion and the recess, and the head is provided with the protrusion as a fulcrum. A base of the rotary head device, wherein the base is tiltably adjustable with respect to the mounting surface of the rotary drum, and the head base and the rotary drum are fixed by an adhesive filled in the recess. Attachment mechanism.