JP2882547B2 - Method of assembling rotary 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 method of assembling a rotary head device used for a DAT or the like, and more particularly to a method of assembling a facing gap between a rotary side and a fixed side transformer and a position of a magnetic head by a minimum adjustment work. And a method of assembling a rotary head device capable of determining the rotational speed with high accuracy.

[0002]

2. Description of the Related Art FIG. 6 is a sectional view showing the structure of a conventional rotary head device. In this rotary head device, a pair of bearings 2 and 3 are held at the center of the lower drum 1.
The shaft 4 is supported rotatably. A sleeve 5 is fixed to the upper end of the shaft 4 by shrink-fitting or press-fitting, and an upper drum 6 is fixed to the sleeve 5 by screws 7. A head base 8 is fixed to a lower surface of the upper drum 6 by a mounting screw 9, and a magnetic head H is fixed to an upper surface of a distal end of the head base 8. An adjusting screw 10 is screwed to the upper drum 6 from above.
The head base 8 is elastically displaced by the amount of advance and retreat of the adjusting screw 10, whereby the height position of the magnetic head H is adjusted. The adjustment of the height position of the magnetic head H by the adjusting screw 10 is performed to eliminate the difference in height between the gaps of the plurality of magnetic heads H. A fixed transformer 11 is adhered and fixed to the upper end of the lower drum 1.
A rotating transformer 12 is adhered and fixed to the lower surface of the sleeve 5.

[0003]

In the rotary head device having the above-described structure, the dimensions that must be ensured in the assembling work are the opposing gap δ between the fixed transformer 11 and the rotary transformer 12 and the magnetic head H Reference position of gap (for example, lead step 1a on the outer periphery of lower drum 1)
From the height h ₀ . However, in actual assembly, it is difficult to set the above dimensions δ and h ₀ without adjustment due to the accumulation of dimensional tolerances of each part. For example, the tolerance of the thickness dimension of the fixed transformer 11 and the rotating transformer 12 is usually about ± 20 to 30 μm, and the minimum dimension and the maximum dimension have a maximum dimension difference of 60 μm. Therefore, when assembling the lower drum 1 and the upper drum 6 and setting the gap δ of the transformer within an allowable value,
The maximum displacement of the relative position of the upper drum 6 with respect to the lower drum 1 is about 2 × 60 μm = about 120 μm. This means that the height h ₀ of the gap of the magnetic head H is shifted by about 120 μm at the maximum. The allowable range of the deviation of the height position of the magnetic head H is usually about ± 15 to 20 μm, so that the deviation of the thickness of the transformers 11 and 12 alone deviates from the allowable range.

Therefore, conventionally, when the lower drum 1, the shaft 4, and the sleeve 5 are assembled, the value of the opposing gap δ between the fixed transformer 11 and the rotary transformer 12 is set within an allowable range. After that, the upper drum 6 is fixed on the sleeve 5. At this time, the installation surface of the sleeve 5 and the upper drum 6 (a)
Then, the sleeve 5 or the upper drum 6 is shaved, and the height h ₁ between the installation surface (a) and the gap between the magnetic head H is set with high accuracy. Accordingly, and from a reference position such as a lead step 1a to let out the height h ₀ of the gap of the magnetic head H with high accuracy. As described above, conventionally, in order to ensure the dimensions indicated by δ and h ₀ with high accuracy (a)
Requires assembling of the installation surface, which is very complicated and requires many steps. SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides a method of assembling a rotary head device capable of determining a gap size of a transformer and a height position of a magnetic head with high accuracy in a simple and minimal process. It is intended to be.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to a system which is fixed to a shaft.
Fixed drum transformer on the lower drum and bearing on the shaft via bearing
Take the rotating transformer on the upper drum that is rotatably supported.
Attach the opposing surfaces of both transformers to a predetermined gap.
And a magnetic head is supported on the upper drum.
To attach the held head base to the specified position.
In the method of assembling a transfer head device, the fixed transformer
The distance between the opposing surface and the reference position on the lower drum side is a predetermined value.
So that the clearance between the lower drum and the fixed transformer is
Fixing the unit with an adhesive and facing the rotating transformer.
So that the distance between the surface and the reference position on the upper drum side is a predetermined value.
The gap between the upper drum and the rotating transformer is
Fixed and the distance between the magnetic head and the reference position on the upper drum side.
Place the head base on the upper drum so that the
The upper drum on the shaft to which the lower drum is fixed.
A shim that passes through the bearing and is interposed between the lower drum and the bearing
Depending on the thickness of the plate, the rotating transformer and the fixed transformer
Setting the gap of the facing surface with the predetermined value to a predetermined value.
It is characterized by doing. In addition, the present invention
A fixed transformer is mounted on the fixed lower drum, and a bearing is mounted on the shaft.
The upper drum, which is rotatably supported via
And fix the opposing surfaces of both transformers
Oppose each other via a gap, and
The head base supporting the head so that it is in the specified position.
In the method of assembling a rotary head device to be attached, the fixed side
Distance between the opposing surface of the transformer and the reference position on the lower drum side
So that the lower drum and the fixed-side transformer
Fixing the gap between the bearing and the upper drum with the adhesive
At the stage of partial assembly, the bearing is
Given pressure in the axial direction of the
The facing surface of the rotary transformer is located with respect to the inner ring.
The rotation side transformer and the upper drum are
Fixing the gap with an adhesive, and the partial assembling step.
On the floor, the magnetic head is at a predetermined position with respect to the inner ring.
Fixing the head base and upper drum
And inserting the bearing of the subassembly into the shaft
This shaft is fixed to the lower drum, and the inner ring is
Abut on the drum and on the inner ring in the partially assembled state
And a step of applying the same pressurization as that given.
A method of assembling a rotary head device. Furthermore, the present invention
A fixed transformer is attached to the lower drum fixed to the shaft,
Rotation side to the upper drum rotatably supported via bearings
Attach the lance and place the two transformers facing each other.
With a fixed gap, and magnetically
So that the head base supporting the air head is
The method for assembling a rotary head device to be mounted on a
Between the opposing surface of the fixed transformer and the reference position on the lower drum side.
The lower drum and the fixed side truss are set so that the distance becomes a predetermined value.
Fixing the gap with the adhesive with an adhesive;
The distance between the facing surface of the lance and the reference position becomes a predetermined value
Glue the gap between the rotating transformer and the upper drum
And the part where the shaft, bearing and upper drum are assembled
In the assembly step, the distance between the magnetic head and the reference position
Hold the head base so that
Fix the gap between the base and the upper drum with adhesive, and
By fixing the shaft and rotating the upper drum,
The distance is a predetermined value for each of a number of head bases
So that each of the multiple head bases and the upper drum
Fixing the gap with the adhesive, and the partial assembly
Attach the body shaft to the lower drum,
The gap between the facing surface of the
Assembling the lower and upper drums so that
It is characterized by doing.

[0006]

In the first and second means, a head base for supporting a magnetic head and a rotary transformer are provided on an upper drum which is the same member. Then, at least the rotating transformer and the upper drum are fixed with an adhesive, and in this bonding operation, the gap between the rotating transformer and the upper drum is adjusted so that the facing surface of the rotating transformer is predetermined with respect to the reference position of the upper drum. Set to the position. The head base is also bonded to the upper drum, and the gap between the head drum and the head drum is adjusted, or when the head base and upper drum are screwed together, a shim is interposed between them to reduce the gap between the magnetic heads. The upper drum is set to a predetermined position from the reference position. Thereby, the mutual position between the facing surface of the rotating transformer and the gap of the magnetic head is set so as to be a predetermined interval. In the first means, when assembling the upper drum to the lower drum, a shim is interposed so that an opposing gap between the rotating transformer and the fixed transformer is within a set allowable value. The height position can be set with high accuracy so as to be within the allowable value. Also
In the second means, a rotary transformer and a magnetic head are connected to the upper drum.
When positioning and mounting the pad,
A certain preload to the inner ring of the bearing
Later, when assembling the upper drum to the lower drum,
The same preload as above is applied to the inner ring of the bearing fitted to the bearing.
While incorporating the upper drum,
Keep the gap facing the fixed transformer within the set tolerance
As a result, this opposing gap and head height position
Can be set with high accuracy so as to be within an allowable value.

In the third means, a subassembly comprising an upper drum, a bearing, a rotary transformer and a magnetic head is prepared. At this time, a bonding gap between the rotary transformer and the upper drum is adjusted, and a head base and a magnetic head are connected. By adjusting the adhesive gap with the upper drum, the mutual positional relationship between the facing surface of the rotating transformer and the gap of the magnetic head can be set with high accuracy.
Moreover, when assembling the subassembly, the shaft is held as a reference, and by setting the facing surface of the rotating transformer and the gap position of the head, a plurality of magnetic heads are rotated when the upper drum is rotated around the shaft. gap mutual position also can be set to a very high precision, the head mutual adjustment work using the adjustment screw 10 as in the conventional example shown in FIG. 6 is unnecessary. By inserting the shaft of the subassembly assembled in this way into the lower drum and setting the gap between the transformers within an allowable range, the gap and the gap position of the plurality of magnetic heads are determined with high precision. A head device can be manufactured.

[0008]

BRIEF DESCRIPTION by drawing an embodiment of the present invention Figures 1 to 5. FIG. 1 is a sectional view showing a rotary head device assembled by an assembling method according to a first embodiment of the present invention, and FIG. 2 is an exploded sectional view for explaining the assembling operation. The rotary head device shown in FIG.
The shaft 22 is fixed to the center of the first member 1 by shrink fitting or press fitting. The upper drum 23 has a pair of bearings 24 and 2
5 and the bearings 24 and 25 allow the upper drum 2
3 is rotatably supported on the shaft 22. A projection is formed at the center of the lower drum 21, and the upper surface thereof is a reference surface 21 a, and the inner race 25 a of the lower bearing 25 is formed.
The lower edge of the reference surface 21a may be shim 26 if necessary.
(See FIG. 2). A sleeve 27 also serving as a preload applying member is fixed to the upper end of the shaft 22 with a screw 28. The lower edge 27a of the sleeve 27 is fixed so as to press the inner ring 24a of the upper bearing 24,
As a result, a preload in the thrust direction is applied to the upper and lower bearings 24 and 25. On the upper surface of the lower drum 21, a ring-shaped installation surface 21b is formed, on which the fixed transformer 34 is mounted.
Are adhered.

On the lower surface of the upper drum 23, a head base 3 is provided.
1 is fixed 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 to the upper drum 21 from above. The head base 31 is adjusted according to the amount of adjustment of the adjustment screw 33.
Are elastically displaced, whereby the height position of the magnetic head H is adjusted. The adjustment of the height position of the magnetic head H by the adjusting screw 33 is performed to eliminate the difference in height between the gaps of the plurality of magnetic heads H. As will be described later,
A shim is interposed between the head base 31 and the upper drum 23 as needed. A fixed transformer 34 is adhered and fixed to the upper end of the lower drum 21, and the rotating transformer 3 is mounted on the lower surface of the protrusion 23 a of the upper drum 23.
5 is adhered and fixed. Further, a rotor magnet 37 is fixed to the upper surface of the upper drum 23 via a yoke 36, and a fixed yoke 38 is screwed to the sleeve 27.
The stator coil 39 is fixed to the fixed yoke 38. The upper drum 23 is driven to rotate by the power of a motor composed of a rotor magnet 37 and a stator coil 39.

Next, the operation of assembling the rotary head device will be described with reference to FIG. First, the shaft 22 is fixed to the lower drum 21 by shrink fitting or press fitting. Lower drum 2
The fixed transformer 34 is bonded to the installation surface 21b projecting in a ring shape on the upper surface of the first transformer 1. At this time, the fixed transformer 34
Of the fixed transformer 34 and the mounting surface 21b such that the opposing surface 34a and the reference surface 21a of the lower drum 21 have a predetermined value A.
Is set. On the other hand, the upper drum 23
, A pair of bearings 24 and 25 are fitted. A rotating transformer 35 is adhered to the lower surface of the protrusion 23a of the upper drum 23. In this operation, the upper drum 23 is turned upside down with respect to FIG. 2, and the opposing surface 35a of the rotating transformer 35 is attracted by a attracting means such as a magnet, for example, from the reference surface 23b such as the upper end of the upper drum 23 to the rotating side. Transformer 3
5 so that the height dimension B of the opposing surface 35a becomes a predetermined value.
An adhesive gap 43 between the rotating transformer 35 and the lower surface of the protruding portion 23a of the upper drum 23 is set. Also the head base 31
Is set so that the height C of the gap of the magnetic head H from the reference surface 23b becomes a predetermined value even when the magnetic head H is attached to the upper drum 23. This setting is performed by selecting and interposing a shim having a desired thickness dimension between the head base 31 and the upper drum 23. Alternatively, the head base 31 is adhered to the upper drum 23 so that the value of C becomes a predetermined value.
An adhesive gap between the head base 31 and the upper drum 23 may be set. As described above, the height dimension B from the reference surface 23b to the facing surface 35a of the rotary transformer 35 and the height dimension C from the reference surface 23b to the gap of the magnetic head H are set to predetermined values. The relative position distance D between the opposing surface 35a of the magnetic head H and the gap between the magnetic head H can be set to a predetermined value.

In the assembly operation of the rotary head device, FIG.
The bearings 24 and 2 held on the upper drum 23 as shown in FIG.
5 is inserted into the shaft 22, the sleeve 27 is fixed to the upper end of the shaft 22, and a preload is applied to the bearings 24 and 25. At this time, the reference surface 21a of the lower drum 21 and the bearing 2
The shim 26 is interposed between the inner ring 25a and the inner ring 25a. By selecting the thickness E of the shim 26, the facing gap δ between the fixed transformer 34 and the rotating transformer 35 is set to a predetermined value (a predetermined value within an allowable range) in the assembled state shown in FIG. Set. Here, the fixed transformer 3
4 is assembled with the distance A set with respect to the reference surface 21a of the lower drum 21.
Since the distance D between the facing surface 35a of the rotating transformer 35 and the gap of the magnetic head H is set on the side, by setting the facing gap δ between the fixed transformer 34 and the rotating transformer 35 to an appropriate value. , Lower drum 21
The height dimension h ₀ (see FIG. 1) between the lead step 21c on the outer periphery and the gap between the magnetic head H can be set to a predetermined value.

In the assembling method shown in FIG. 2, the shim 26 may not be used. In this case,
In the assembly operation of the upper drum 23, a fixed preload is applied to the inner rings 24a and 25a of the bearings 24 and 25 using a jig in a state where the bearings 24 and 25 are assembled to the upper drum 23. In the state where the preload is applied, the facing surface 35a of the rotating transformer 35 is attracted by a magnet or the like, and the rotating transformer 35 is adjusted so that the distance F from the inner ring 25a of the bearing 25 in the preloaded condition to the facing surface 35a becomes a predetermined value. An adhesive gap between the upper drum and the upper drum is set. At the same time, the height G from the inner race 25a of the bearing 25 in the preloaded state to the gap of the magnetic head H is set using a shim or the like. The relative distance D between the facing surface 35a and the gap between the magnetic head H can be set to a predetermined value by using F and G. When the values of F and G and the value of A on the lower drum side are set to predetermined values, and the preload of the same value as the preload applied by the jig during assembly is applied to each of the bearings 24 and 25 by the sleeve 27, the shim 26 is formed. Without providing the inner ring 25a of the bearing 25, the lower drum 21
The gap δ between the transformers and the height position h0 of the gap of the magnetic head H can be set to predetermined values only by directly contacting the reference surface 21a.

In the above, each of the transformers 34 and 35
As the adhesive used for bonding between the upper drum 23 and the lower drum 21 and the upper drum 23, an adhesive which cures in a short time to the inside of the gap even if a mutual gap is formed is used. As the properties of the adhesive, those that do not shrink after curing and have excellent moisture resistance and environmental resistance are used .

[0014]

FIG. 3 is a sectional view showing a rotary head device assembled by an assembling method according to a second embodiment of the present invention.
FIG. 4 is an exploded sectional view for explaining the assembling method.
The rotary head device shown in FIG. 3 has the same basic structure as that shown in FIG. 1, a shaft 22 is fixed to a lower drum 21, and an upper drum 23 is a shaft 2 by a pair of bearings 24 and 25.
2 is supported rotatably. In this embodiment, the fixed transformer 34 is fixed to the lower drum 21 by bonding, and the rotating transformer 35 and the head base 31 are fixed to the upper drum 23 by bonding. The motor is provided on the upper part, and the rotor magnet 37 is provided.
Is fixed to the upper surface of the upper drum 23, and the stator coil 39 is provided on a fixed yoke 38 fixed to the sleeve 27 above the shaft 22.

[0016] will be described with reference to FIG assembling work of the rotary head apparatus. First, regarding the lower drum 21,
The fixed transformer 34 is bonded to the installation surface 21b projecting in a ring shape from the upper surface. At this time, the fixed transformer 34
Of the rotating transformer 34 and the mounting surface 21b such that the facing surface 34a and the reference surface 21d of the lower drum 21 have a predetermined value A.
Is set. As a result, the relative position of the fixed transformer 34 with respect to the lower drum 21 (particularly, the lead step 21c) of the facing surface 34a is determined. The reference surface on which the predetermined value A is set is not limited to 21d but may be any position, for example, the lower surface 21e of the upper drum 21. It is necessary that the reference surface is a position where the position of the facing surface 34a of the fixed transformer 34 can be determined and the distance to the lead step 21c can be set with high accuracy.

On the upper drum 23 side, the upper drum 2
3. A subassembly including the shaft 22, the bearings 24 and 25, the sleeve 27, and the head base 31 is produced. That is, the upper drum 23 holds the bearings 24 and 25 and the shaft 2
2 and a sleeve 27 is screwed on the upper part of the shaft 22.
Fixed by, by pressure narrow inner ring 24a and 25a of the bearings 24 and 25 located between the sleeve 27 and the ring 46, keep impart preload to the bearing 24 and 25. Then, the rotating transformer 35 is bonded to the lower surface of the projecting portion 23a at the center of the upper drum 23, and the head base 31 is bonded to the head mounting surface 23c on the lower surface around the upper drum 23. At this time, the gap between the rotating transformer 35 and the upper drum 23 and the gap between the head base 31 and the upper drum 23 are adjusted to set the gap position between the facing surface 35a of the rotating transformer 35 and the magnetic head H. At this time, each position is set with reference to the shaft 22. For example, as shown in FIG. 4 , the sleeve 27 is held by a jig 51, and a reference surface 51 a of the jig 51 is used as a reference. Further, the opposing surface 35a of the rotary transformer 35 is adsorbed by an adsorbing means such as a magnet, and the opposing surface 35a and the reference surface 5a are sucked.
An adhesive gap between the rotary transformer 35 and the upper drum 23 is set so that the positional interval B between the rotary drum 1a and the upper drum 23 becomes a predetermined value. By using the jig 51 as a reference, the perpendicularity between the facing surface 35a of the rotating transformer 35 and the center of the shaft 22 can be secured.

Similarly, also in the bonding operation of the head base 31, the head base 31 is held by a magnet or other suction means or holding means so that the gap between the magnetic head H and the reference surface 51a is at a predetermined distance C. And the holding space 4 between the head base 31 and the upper drum 23.
7 is set. At this time, since the sleeve 27 is held by the jig 51, the upper drum 23 is rotated while the sleeve 27 is held by the jig 51, and the distance C from the reference surface 51a to the gap for each of the plurality of magnetic heads H is determined. Is determined, the displacement of the plurality of magnetic heads H can be eliminated when the upper drum 23 rotates about the shaft 22. Therefore, as in the conventional example shown in FIG. 6 , it is not necessary to deform the head base 8 by the adjusting screw 10 to perform the adjustment work between the plurality of magnetic heads H. In FIG. 4, although the sleeve 27 is held by the jig 51, it is possible to hold the lower part illustrated in FIG. 4 of the shaft 22 by a jig.

The subassembly in which the upper drum 23, the shaft 22 and the like are assembled as described above is assembled to the lower drum 21. In this work, the lower part of the shaft 22 of the
This is done by inserting and fixing it in 1. At this time, the opposing surface 34a of the fixed transformer 34 and the rotating transformer 35
The relative position between the lower drum 21 and the shaft 22 is determined so that the gap δ of the opposing surface 35a becomes a predetermined value. The opposite surface 34a of the fixed transformer 34 is connected to the reference surface 21 of the lower drum 21.
d, and the relative position between the opposing surface 35a of the rotary transformer 35 and the gap between the magnetic heads H is determined. the height of the gap between the magnetic head H is also determined, so that the height h ₀ between the gap of the magnetic head H from the read step 21c shown in FIG. 3 is set for.

[0020] Figure 5 is a modification of the second embodiment shown in FIGS. 3 and 4. In this modification, the bearings 24 and 25 do not have inner rings, and the balls 24b and 25b
a. Bearings 24 and 25 are provided on the upper drum 23.
Are held, and a pressure is applied to the outer rings 24c and 25c by a spring 48. In this rotating head device is integrated shaft 22 and the bearing 24 and 25, part assembly in a state where the bearing 24 and 25 on the drum 23 has been inserted by the same method as shown in FIG. 4, the lower drum 21.

[0021]

As described above, according to the first aspect of the present invention, the predetermined distance from the reference position on the lower drum side is maintained.
Between the fixed-side transformer positioned at
Fix with adhesive, and further from the reference position on the upper drum side
Rotating transformer and magnet positioned at a distance
The air head and the upper drum are fixed with an adhesive. Soshi
Between the inner ring of the bearing fitted to the upper drum and the lower drum
With a shim of a predetermined thickness,
By setting the gap with the
The gap size of the transformer in a simple and minimal process
Only the height position of the magnetic head with respect to
Can be determined with high precision. According to the second aspect of the present invention, the predetermined distance from the reference position on the lower drum side is set.
Between the fixed-side transformer positioned at
It is fixed with an adhesive, and the bearing inside the upper drum
With a predetermined pressure applied to the wheel in the axial direction of the bearing,
Positioned at a predetermined distance from the inner ring
Between the rotating transformer and the magnetic head and the upper drum.
Fix with adhesive. And the bearing fitted to the upper drum
Contact the inner ring with the lower drum, and
By applying the same pressurization, it is simple and with minimum process
Magnetic head for transformer gap size and lower drum
Height position can be determined at the same time and with high accuracy
You. According to the third aspect of the present invention, a subassembly in which the shaft and the upper drum are assembled is formed , and both the rotary transformer and the head base are bonded to the upper drum with reference to the shaft, and the bonding gap is adjusted. In this way, the gap position between the facing surface of the rotating transformer and the magnetic head is determined, so not only can the gap of the assembled transformer and the position of the magnetic head be determined with high accuracy, but also the mutual Can be determined with high precision, and the work of adjusting the positions of the magnetic heads as in the related art becomes unnecessary.

[Brief description of the drawings]

FIG. 1 is a sectional view of a rotary head device assembled by an assembling method according to a first embodiment of the present invention.

FIG. 2 is an exploded sectional view for explaining an assembling method according to the first embodiment.

FIG. 3 shows an assembly method according to a second embodiment of the present invention;
Sectional view of the standing rotary head device,

FIG. 4 is a flow chart for explaining an assembling method according to a second embodiment;
Disassembled sectional view,

FIG. 5 is a perspective view of an assembly method according to a second embodiment of the present invention;
Cross-sectional view of a rotating head device having another structure that is erected,

FIG. 6 is a sectional view showing a structure of a conventional rotary head device.

[Explanation of symbols]

 21 Lower Drum 22 Axis 23 Upper Drum 24, 25 Bearing 31 Head Base H Magnetic Head 34 Fixed Transformer 35 Rotational Transformer

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-50351 (JP, A) JP-A-62-140201 (JP, A) JP-A-4-141812 (JP, A) 24508 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) G11B 5/02, 5/52, 5/53

Claims (3)

(57) [Claims] A fixed drum mounted on a lower drum fixed to a shaft;
The upper shaft rotatably supported on the shaft via a bearing.
Attach the rotating transformer to the ram, and
Facing each other via a predetermined gap, and
Prescribe the head base supporting the magnetic head on the writing drum
For the method of assembling the rotating head device that is mounted so that it is positioned
Oite, wherein the facing surface and the lower drum side of the reference position of the fixed-side transformer
Fixed to the lower drum so that the distance from the
Fixing a gap with the side transformer with an adhesive; and a reference position on the opposing surface of the rotary side transformer and the upper drum side.
So that the distance between the upper drum and the rotating side
The gap between the lance and the magnetic head is fixed with an adhesive.
Make sure that the distance from the reference position on the drum side is
Mounting the base on the upper drum and inserting the bearing of the upper drum through the shaft to which the lower drum is fixed,
It depends on the thickness of the shim interposed between the lower drum and the bearing.
Between the rotating transformer and the fixed transformer.
Setting the gap to a predetermined value . 2. A fixed-side transformer attached to a lower drum fixed to a shaft.
The upper shaft rotatably supported on the shaft via a bearing.
Attach the rotating transformer to the ram, and
Facing each other via a predetermined gap, and
Prescribe the head base supporting the magnetic head on the writing drum
For the method of assembling the rotating head device that is mounted so that it is positioned
Oite, wherein the facing surface and the lower drum side of the reference position of the fixed-side transformer
Fixed to the lower drum so that the distance from the
In the step of fixing the gap with the side transformer with an adhesive, and the partial assembling step of assembling the bearing and the upper drum,
A predetermined preload is applied to the inner ring of the bearing in the axial direction of the bearing.
, The rotating transformer based on the inner ring
So that the opposed surface of
Fixing the gap between the upper drum and the upper drum with an adhesive; and, in the partial assembling step, a magnetic head based on the inner ring.
Head base and upper drum so that the
And inserting the bearing of the sub-assembly into a shaft,
The shaft is fixed to the lower drum, and the inner ring is
And give it to the inner ring in the partially assembled state.
Applying the same pressurizing force to the rotary head device. 3. A fixed-side transformer is attached to a lower drum fixed to a shaft.
The upper shaft rotatably supported on the shaft via a bearing.
Attach the rotating transformer to the ram, and
Facing each other via a predetermined gap, and
Prescribe the head base supporting the magnetic head on the writing drum
For the method of assembling the rotating head device that is mounted so that it is positioned
And A reference position between the facing surface of the fixed transformer and the lower drum side
Fixed to the lower drum so that the distance from the
Fixing the gap with the side transformer with an adhesive; The distance between the facing surface of the rotating transformer and a reference position is
The rotation-side transformer and the upper drum are adjusted so as to have a predetermined value.
Fixing the gap with an adhesive; In the partial assembly stage where the shaft, bearing and upper drum are assembled,
The distance between the magnetic head and a reference position is set to a predetermined value.
Hold the head base on the head base and upper drum
Is fixed with an adhesive.
By rotating the ram, the head base
A plurality of heads are set so that the distance becomes a predetermined value for each.
The gap between each base and the upper drum is fixed with adhesive.
The process of determining The shaft of the subassembly is fixed to the lower drum,
When the rotating transformer and the fixed transformer
Assemble the lower and upper drums so that the
And the process A method of assembling a rotary head device.