JP3160871B2 - Rotating magnetic head device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary magnetic head device used for a VTR or the like.

[0002]

2. Description of the Related Art A rotary magnetic head device is, for example, a VT.
R, DDS (Digital Data Streamer), DAP
Used for etc. This type of rotating magnetic head device includes a rotating drum and a flange.

The fitting between the rotary drum and the flange is a loose fit, and by adjusting this, the run-out of the outer circumference of the rotary drum has been guaranteed.

[0004] Alternatively, the rotating drum and the flange are heated at a high temperature at normal temperature, and the flange is heated to a high temperature. Was guaranteed to run out of the outer periphery.

[0005]

However, in the former method, a high level of skill is required for the adjustment work, and a jig and a tool for always measuring the peripheral runout are required. Moreover, the number of work steps was large.

In the latter method, a jig for heating the flange to a high temperature is required, and the operator has to carry the heating jig even at the time of repair replacement.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and it is possible to replace a rotary drum without requiring special jigs and tools at the time of repair while maintaining the outer circumferential runout of the rotary drum with high accuracy. It is an object of the present invention to provide a rotating magnetic head device.

[0008]

According to the first aspect of the present invention, there is provided a rotating device.
A rotating magnetic head having a member and a shaft fixed to the rotating member.
In the head device, the rotating member to which the shaft is fixed
The part has a tapered part for press-fitting the shaft and the tape.
A straight section below the taper section,
The inner diameter of the shaft is set larger than the outer diameter of the shaft, and the taper is
Outside the portion, the tapered portion from the top of the rotating member
Characterized in that a groove having substantially the same depth as that is formed,
This is a rotary magnetic head device.

According to a second aspect of the present invention, there is provided the rotating device according to the first aspect.
In the magnetic head device, the rotating member may be a magnetic head
A rotating drum comprising: a drum fixed to the rotating drum;
Having a flange, the tapered portion and the
A straight portion and the groove are formed.

According to a third aspect of the present invention, there is provided the rotating device according to the first aspect.
In the magnetic head device, the rotating member may be a magnetic head
A rotating drum comprising:
The part of the rotating drum to which the tapered part and the front
The straight portion and the groove are formed.

[0011] The invention of claim 4 is claim 1 or claim 1.
3. The rotating magnetic head device according to claim 2, wherein
Has a rotating drum with a magnetic head and a flange.
The flange is fixed to the part of the rotating drum
The tapered portion, the straight portion and the groove are formed
I have. Further, the invention of claim 5 is the invention of claim 1 or claim
3. The rotary magnetic head device according to 3, wherein the groove and the
The part surrounded by the flange has a thin cylindrical shape.
You.

[0012]

According to the first aspect of the present invention, at the position of the rotating member,
Has a tapered part and a straight part.
The seat portion is below the tapered portion. The inner diameter of the straight part is
It is set larger than the outer diameter of the shaft. This allows the axis
It can be guided smoothly through the straight part,
The smoothly guided shaft has a tapered part that acts as a press-fit part.
Press fitting can be performed reliably. Taper for press-fitting
Grooves of approximately the same depth as the part are provided from both sides of the rotating member
By this, the fitting part of the shaft of the rotating member becomes thin
Therefore, the thin-walled part is easily deformed and reduces the pressure input of the shaft.
be able to.

According to the second aspect of the present invention, the rotary member is a rotary drive.
The drum has a tapered section and a storage
A groove and a groove are formed. This allows only the rotating drum
In this case, a tapered portion, a straight portion, and a groove may be formed. Claim
In the invention of Item 3, the rotating drum to which the flange is fixed,
What is necessary is just to form a taper part, a straight part, and a shaft.

According to the fourth aspect of the present invention, the groove is surrounded by the shaft.
The part has a thin cylindrical shape. This allows the taper
On the other hand, when press-fitting the shaft, press-fit the shaft into a thin cylindrical part.
Can be reduced. In the invention of claim 5, the shaft and the flange
The part surrounded by the flange is a thin cylinder
The thin cylindrical part is easily deformed and reduces the shaft pressure input.
can do.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, since the Examples described below are preferred specific examples of the present invention, various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. The embodiment is not limited to these embodiments unless otherwise stated.

FIG. 1 is a sectional view showing a preferred embodiment of the rotary magnetic head device of the present invention. In FIG. 1, a rotary drum 1 of a rotary magnetic head device rotates with respect to a fixed drum 12. A magnetic head 2 is mounted on the rotating drum 1. The height direction of the rotating drum 1 is fixed by a flange 3. The rotating direction of the rotating drum 1 is fixed by the shaft 4.

The shaft 4 also serves as an inner ring of the bearings 5 and 6. The outer diameter of the shaft 4 and the groove 4a of the shaft 4 are machined with high precision. Therefore, the rotation centers of the bearings 5 and 6 and the outer diameter center of the shaft 4 are configured to substantially coincide with each other.

Next, FIG. 2 shows a part of the rotary drum 1 and
A part of the upper end of the shaft 4 is shown in an enlarged manner. 1 and 2, the outer diameter 1a, the inner diameter 1b, and the minimum diameter 1 of the tapered portion 1c.
d is processed to be coaxial. The diameter tolerance of the inner diameter 1b of the rotary drum 1 is set to be larger than the maximum diameter of the tolerance of the outer diameter 4a of the shaft 4 by about several μm.

The diameter of the lower side of the tapered portion 1c is
It is matched with the diameter of b. Further, the diameter tolerance is set so that the minimum diameter 1d on the upper side of the tapered portion 1c matches the minimum diameter of the tolerance of the outer diameter 4a of the shaft 4 or is reduced by about several μm.

Further, the groove 14 is formed in the shaft fitting portion 30 of the rotary drum 1 so that the outside is a thin cylindrical portion 15. That is, the thin cylindrical portion 15
Is tapered from the upper part of the rotating drum 1 between the groove 14 and the shaft 4.
It is formed at substantially the same depth as the portion 1c . The groove 14 is, for example, a ring-shaped groove.

As described above, the thin cylindrical portion 15 is a thin cylindrical portion having a height of 1 g and a diameter of 1 e. Accordingly, when the shaft 4 is fitted and press-fitted into the tapered portion 1c, the thin cylindrical portion 15 is easily deformed, and the press-fit of the shaft 4 can be reduced.

The height portion 1f of the rotary drum 1 has a straight diameter to eliminate the possibility of press-fitting.
Thus, rotary drum 1, stress to the axis 4
The straight inner diameter portion 1b, which is a port portion, serves as a guide and advances to the height portion 1h, and the shaft 4 is centered at a portion having the tapered portion 1c. After the centering is performed, the shaft 4 is press-fitted into the tapered portion 1c, and it is possible to maintain the outer circumferential runout of the outer diameter 1a of the rotary drum 1 with high accuracy.

The inner diameter of the rotary drum 1 can be easily measured by measuring the straight inner diameter portion 1b.
Further, the tapered portion 1c can be processed with high precision by an NC machine tool, and can be easily measured by a surface roughness meter or the like.

As for the press-fitting to the tapered portion 1c of the shaft 4, an appropriate press-fitting can be selected by changing the dimension of the outer diameter 1e.

As described above, the shaft 4 and the rotary drum 1 are fitted by press-fitting.

Referring back to FIG. 1, a rotary transformer 16 is arranged between the fixed drum 12 and the flange 3 integrated with the rotary drum 1. The rotary core 17 of the rotary transformer 16 is fixed to the lower surface of the flange 3, and the core 18 of the rotary transformer 16 on the stator side is fixed to the fixed drum 12.
Signals obtained by the magnetic head 2 are exchanged between the core 17 on the rotor side and the core 18 on the stator side.

The motor 9 for rotating the shaft 4 has a magnet 11 and a coil 10. The coil 10 is fixed to the substrate 7.

As a result, when the motor 9 is driven, the shaft 4
, The rotary drum 1 and the flange 3 rotate.

FIG. 3 shows another preferred embodiment of the rotary magnetic head device of the present invention.

In this embodiment, the shaft 104 is directly fitted to the flange 103 and the rotating drum 10
1 and the flange 103 are fixed by press fitting. The fixing relation of the rotary drum 101 and the flange 103 in the embodiment of FIG. 3 by press fitting is the same as the fixing relation of the rotary drum 1 and the shaft 4 in the embodiment shown in FIGS.

The rotary drum 101 has a thin cylindrical portion 115 located outside the flange 103 and a ring-shaped groove 11.
4 is provided. The ring-shaped groove 114 is similar to the ring-shaped groove 14 of the first embodiment shown in FIG.

In this embodiment, the flange 103 is mounted on a fixed drum 112 also called a lower drum via bearings 105 and 106 and a shaft 104. The outer diameter 103a of the flange 103 is cut by incorporating the bearings 105 and 106 by rotating the pressurizing ring 58 at a high speed to rotate the flange 103.

Therefore, the outer diameter 103 of the flange 103
The center of “a” is configured to substantially coincide with the rotation centers of the bearings 5 and 6. That is, cutting is performed after the outer diameter 103a of the flange 103 is assembled into the bearing so as to match the rotation center of the shaft 104.

The present invention is not limited to the above embodiment. For example, the shape of the tapered portion and the shape of the groove are not limited to the illustrated embodiment.

[0035]

As described above, according to the present invention, the outer peripheral runout of the rotary drum is guaranteed or held with high accuracy,
In addition, the force required for press-fitting can be reduced, and replacement can be easily performed without the need for a special tool during repair. Claim
According to the invention of Item 1, the portion of the rotating member has a tapered portion and
It has a straight part, which is tapered
On the underside of the department. The inner diameter of the straight part is larger than the outer diameter of the shaft
It is set well. With this, the shaft has a straight part
Guidance can be provided smoothly through guidance
Shaft is press-fitted into the tapered part that acts as a press-fit part
be able to. This indicates that the outer periphery of the rotating member
Can be held with high accuracy. In addition, the
Grooves of approximately the same depth as the
This makes the shaft fitting part of the rotating member thinner
The thin part is easily deformed to reduce the pressure input of the shaft
can do. According to the second aspect of the present invention, the rotating member rotates
The drum has a tapered section and a
A trate portion and a groove are formed. This allows the rotating drive
Only need to form the taper part, straight part and groove only in the
No. According to the third aspect of the present invention, the rotary door to which the flange is fixed is provided.
The ram should have a tapered part, a straight part and a shaft.
No. According to the invention of claim 4, the portion surrounded by the groove and the shaft is thin.
It has a cylindrical shape. This allows the shaft to be
Reduces the press-fit of the shaft with a thin cylindrical part when press-fitting.
Can be In the invention of claim 5, the shaft and the flange
The part surrounded by is a thin cylindrical shape, so a thin circle
The cylindrical part is easily deformed and can reduce the pressure input of the shaft.
it can.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a preferred embodiment 1 of a rotary magnetic head device according to the present invention.

FIG. 2 is an enlarged view showing a fitting portion between the shaft and the rotary drum according to the first embodiment in FIG. 1;

FIG. 3 is a sectional view showing a preferred embodiment 2 of the rotary magnetic head device of the present invention.

[Explanation of symbols]

 Reference Signs List 1 rotating drum (rotating member) 1c taper portion 3 flange (rotating member) 4 shaft 14 ring-shaped groove 15 thin cylindrical portion 30 fitting portion

Claims (5)

(57) [Claims] 1. A rotating member and a shaft fixed to the rotating member.
In the rotary magnetic head device including: a portion of the rotating member to which the shaft is fixed,
A taper portion for press-fitting and a strike below the taper portion
The straight portion has an inner diameter outside the shaft.
Larger than the diameter, outside the tapered portion,
A groove having substantially the same depth as the tapered portion is formed from the upper portion of the rotating member.
Rotating magnetic head device characterized by being formed.
Place. Wherein said rotating member includes a rotary drum having a magnetic head, a flange which is fixed to the front Symbol rotary drum, said said taper portion on the rotary drum side straight
2. The rotary magnetic head device according to claim 1, wherein a portion and the groove are formed. Wherein said rotary member comprises a rotary drum having a magnetic head, has a flange, wherein a portion to the tapered portion of the front Symbol rotating drum in which the flange is secured storage
2. The rotary magnetic head device according to claim 1, wherein a groove portion and the groove are formed. 4. A portion surrounded by the shaft and the shaft is thin.
3. The rotating magnetic head device according to claim 1, wherein the rotating magnetic head device has a thick cylindrical shape . 5. A portion surrounded by said groove and the flange is adapted to thin cylindrical shape, according to claim 1 or claim 3
3. The rotary magnetic head device according to claim 1.