JPH0437282Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a gap adjustment structure for a rotary head drum, particularly a rotary transformer thereof.

[Prior Art] FIG. 2 is a sectional view showing the structure of a conventional rotary head drum. In the figure, 1 is a rotating upper drum;
2 is a rotating disk, 3 is a main shaft, 5 is a rotor of a rotary transformer, and 6 is a stator of a rotary transformer. The rotor 5 and stator 6 constitute a rotary transformer. 7 is a rotating lower drum, 8 and 9 are bearings, 10 is a video head, 11 is a preload collar, 12 is a preload boss,
13 is a spacer for adjusting the gap of the rotary transformer.

In the above rotary head drum, the rotation of the main shaft 3 rotates the rotary disk 2 and the rotor 5 of the rotary transformer fixed thereto.
Then, the video head 10 detects a signal recorded on a video tape (not shown) and transmits it to the rotor 5 of the rotary transformer. The rotor 5 of the rotary transformer generates a magnetic field corresponding to the signal, and the stator 6 of the rotary transformer receives the magnetic field and outputs a current corresponding to the magnetic field to an amplifier circuit (not shown).

At this time, the signal transmitted to the rotor 5 of the rotary transformer is weak, so in order to accurately transmit the detection signal of the video head 10 to the stator 6 of the rotary transformer, the rotor 5 of the rotary transformer must be
It is necessary to adjust the gap between the stator 6 and the stator 6 with high precision and uniformly.

[Problem to be solved by the invention] Gap adjustment of the rotary transformer in the rotating head drum shown in FIG. This was done by changing the height of 5. At this time, gap adjustment requires control on the micron order, so after measuring the height of each part of the rotary transformer, a spacer 13 that provides a constant gap is selected.

Therefore, in the conventional rotating head drum,
There were problems such as a complicated assembly process and large variations in gap dimensions.

The present invention was devised to solve these problems, and the purpose is to provide a rotary head drum that improves the ease of assembling a rotary transformer and makes it possible to control the gap with high precision. shall be.

[Means and effects for solving the problems] The rotary head drum of the present invention has a through hole provided in the recess of the lower rotary drum, the rotary head drum is inverted, and the rotary head drum is installed in the gap between the rotor and the stator of the rotary transformer and is later removed. An adhesive layer is formed by solidifying adhesive that has been injected through the through hole between the recess of the lower rotating drum and the stator of the rotary transformer with the spacer inserted therein. This adhesive layer has both the function of fixing the stator of the rotary transformer to the lower rotating drum and the function of adjusting the gap of the rotary transformer, making the gap highly accurate and uniform.

[Embodiment] FIG. 1 is a sectional view showing the structure of a rotating head drum according to an embodiment of the present invention. In the figure, 4 is an adhesive layer, and 14 is an adhesive flow hole (through hole) provided in a recessed portion of the lower rotating drum 7. The rotating head drum is assembled as follows.

First, the upper rotating drum 1 is fixed to the rotating disk 2, and the rotor 5 of the rotary transformer is fixed to the rotating disk 2. Furthermore, the rotating disk 2 is moved to the main shaft 3.
Fixed to. Next, the stator 6 of the rotary transformer is placed in the recess of the lower rotating drum 7 to which the bearings 8 and 9 are fixed. Furthermore, a spacer (not shown) having a thickness corresponding to the gap of the rotary transformer to be secured is placed on top of the stator 6, and then the main shaft 3 is inserted into the bearings 8 and 9. This spacer is formed into a film that can be easily deformed.

Next, insert the lower end of the main shaft 3 into the preload collar 11, and stop the insertion when it reaches the bearing 9 (at this point, the preload collar 11 is not fixed to the main shaft 3 and can move in the axial direction). ), then,
The lower end of the main shaft 3 is inserted into the preload boss 12 and fixed, and during this fixation, the preload boss 12 applies preload to the inner ring of the bearing 9 via the preload collar 11.

Finally, the rotary head drum assembled so far is turned upside down and placed upside down, and the stator 6 of the rotary transformer is dropped in the direction of the rotor 5, that is, the stator 6 and rotor 5 are brought into close contact with each other via the spacer. After the rotation lower drum 7
Pour the adhesive through the adhesive pouring hole 14. After the adhesive has solidified and the adhesive layer 4 has been formed, the spacer is removed.

The rotary head drum of this embodiment is assembled as described above, and the gap of the rotary transformer is controlled with high precision by the thickness of the spacer sandwiched therebetween.

[Effects of the invention] As described above, according to the invention, when the rotating head drum is inverted and a spacer to be removed later is inserted into the gap between the rotor and stator of the rotary transformer, the recess of the lower rotating drum and the rotary Since the gap of the rotary transformer is adjusted by the adhesive layer formed by solidifying the adhesive that is injected through the through hole between the transformer and the stator, a highly accurate and uniform gap can be obtained. , the performance of rotary transformer can be improved. Furthermore, during assembly, there is no need to measure the mounting height of the rotary transformer, etc., making assembly easier.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the structure of a rotary head drum according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the structure of a conventional rotary head drum. Explanation of symbols, 1... Rotating upper drum, 2... Rotating disk, 3... Main shaft, 4... Adhesive layer, 5...
Rotor of rotary transformer, 6... Stator of rotary transformer, 7... Lower rotating drum, 8, 9...
...Bearing, 10...Video head, 11...
Preload collar, 12 Preload boss, 13... Spacer for adjusting the gap of the rotary transformer, 14... Adhesive inflow hole.

Claims (1)

[Claims for Utility Model Registration] A rotating disk fixed to a main shaft, a rotor of a rotary transformer fixed to the rotating disk, a bearing fixed to the main shaft at a position below the fixed position of the rotating disk, and a recess. A rotary head drum comprising: a lower rotating drum supported by the bearing; and a stator of a rotary transformer disposed in a recessed portion of the lower rotating drum to face a rotor of the rotary transformer. a through hole provided in the recess; and a through hole provided in the lower rotating drum when the rotary head drum is inverted and a spacer to be removed later is inserted into the gap between the rotary transformer rotor and the stator of the rotary transformer; A rotary head drum comprising: an adhesive layer formed by solidifying an adhesive injected through the through hole between the drum and the stator of the rotary transformer to adjust the gap.