JPH05967Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Industrial application field> This invention is applicable to video tape recorders and PCM
The present invention relates to a rotating head drum installed in a tape recorder or the like using a pulse code modulation method.

<Prior art> In this type of rotating head drum, the output of the magnetic head provided on the rotating drum is transmitted to the stationary side via a rotary transformer and drawn out to the outside. Since the equipment was mounted on a fixed drum with the supported rotating shaft as a reference, after the fixed drum and rotating drum were assembled, the magnetic head cable and the rotary transformer cable were connected at the top of the rotating drum.

For example, as shown in FIG. 3, a sleeve 3 is fixed to a rotary shaft 2 which is rotatably inserted into and supported by the axial center of a fixed drum 1 by press fitting or adhesive. The stator 4 of the rotary transformer is fixed to the inside of the fixed drum 1, and the rotor 5 is fixed to the sleeve 3 and disposed opposite to the outer periphery of the stator 4. The rotating drum 6 is attached to the sleeve 3, and the connection between the magnetic head 7 and the rotor 5 is provided in the rotating drum 6 through cable insertion holes 6a, 6b, and 3a formed in the rotating drum 6 and the sleeve 3. This is done on the relay board 8.

The assembly of such a rotating head drum is carried out in the fourth stage.
As shown in the figure, a stator 4 is aligned and fixed to a fixed drum 1 into which a rotating shaft 2 is inserted and supported in advance, while a rotor 5 has its cable connected to a sleeve 3.
When the sleeve 3 is inserted through the cable insertion hole 3a of
sticks to. Then, the sleeve 3 is fixed to the rotating shaft 2 while being centered, and then the rotating drum 6 is positioned and attached to the sleeve 3. At this time, the cable of the rotor 5 is passed through the cable insertion hole 6b and guided upward. The relay board 8 is connected to the rotating drum 6
The cable of the magnetic head 7 led from the cable insertion hole 6a and the cable of the rotor 5 led from the cable insertion holes 3a and 6b are connected by soldering. Finish the attachment work.

<Problems to be solved by the invention> However, such a rotating head drum requires work such as passing each cable through a cable insertion hole, making it extremely difficult to automate the assembly, and the number of cables and soldering The problem was that there were many steps and work defects such as wiring mistakes were likely to occur. Furthermore, since the cable is exposed to the outside, there is a risk of wire breakage occurring during the process. Another disadvantage is that the configuration is complicated due to cable insertion holes, relay boards, and the like.

<Means for Solving the Problems> In order to solve the above-mentioned problems, the rotating head drum of the present invention has a fixed drum for guiding the tape, and a mounting member attached to a shaft supported at the axial center of the fixed drum. In a rotating head drum having a rotating drum having a magnetic head attached through a rotary drum and a rotary transformer for transmitting signals to the magnetic head, a cylindrical rotary transformer is used as the rotary transformer, and a stator transformer is attached to the fixed drum. and a rotor transformer having an inner diameter larger than an outer diameter of the mounting member is fixed to the rotating drum in advance and fixed to the fixing member.

<Function> Since the inner diameter of the rotor is larger than the outer diameter of the mounting member, it is possible to attach the rotating drum to the mounting member with the rotor fixed to the rotating drum in advance, and the rotor and the magnetic head can be connected in advance. This eliminates the cable connection work during the assembly process, and eliminates the need for cable insertion holes, relay boards, etc.

<Embodiment> FIG. 1 is a partial sectional view showing an embodiment of the present invention.

The fixed drum 11 is attached to a chassis (not shown), and a rotary shaft 12 is rotatably inserted and supported in the central portion of the fixed drum 11, and its rotation is controlled by a drive motor (not shown).

A cylindrical portion 11a is integrally formed inside the fixed drum 11 so as to be located on the outer periphery of the rotating shaft 12, and a stator 13 of a rotary transformer is fixed to the outer periphery of the cylindrical portion 11a.

Further, a sleeve 14 serving as a mounting member is attached to the upper part of the rotating shaft 12, and a rotating drum 15 is fixed to this sleeve 14.

A magnetic head 16 is attached to the lower surface of the rotating drum 15, and the tip of the head tip projects outward from a window formed on the outer periphery of the rotating drum 15.

Further, a rotor 17 of a rotary transformer is fixed to the inside of the rotating drum 15, and faces the stator 13. The inner diameter of this rotor 17 is larger than the outer diameter of the sleeve 14. The rotor 17 and the magnetic head 16 are directly connected to each other on the lower surface of the rotating drum 15.

In such a rotating head drum, after the stator 13 is fitted and fixed to the cylindrical portion 11a of the fixed drum 11 from above, the rotating shaft 1 is fixed as shown in FIG.
A sleeve 14 is fixed to the top of 2. Then, the rotating drum 15 to which the rotor 17 is fixed in advance is assembled from above the sleeve 14. In other words, rotor 1
Since the inner diameter of the sleeve 7 is larger than the outer diameter of the sleeve 14, the sleeve 14 can be fitted by being fitted onto the outer periphery of the sleeve 14.

Here, the magnetic head 16 and rotor 17 are accurately positioned and fixed in the height and radial directions with respect to the integrated rotating drum 15, while the sleeve 14 and stator 13 are also fixed with respect to the fixed drum 11 and the rotating shaft 12. As such, it is positioned with high precision in the height and radial directions.

Therefore, by finely adjusting the rotating drum 15 with respect to the sleeve 14 to precisely position and fix the height and radial position of the magnetic head 16, the stator 13 and rotor 17 of the rotary transformer can be connected. Complete the assembly work by holding them in the proper facing position.

<Effects of the Invention> According to the invention, since the inner diameter of the rotor is larger than the outer diameter of the attachment member, it is possible to attach the rotating drum to the attachment member with the rotor fixed to the rotation drum in advance. Therefore, by connecting the rotor and the magnetic head in advance, there is no need for wiring during the assembly process. Further, it is not necessary to insert both cables into cable insertion holes formed in the rotating drum or the mounting member. Furthermore, the cable exposed to the outside will not be disconnected during assembly work.

Furthermore, the rotor and stator of the rotary transformer can be positioned all at once by positioning the magnetic head, which requires higher precision.

From the above, it becomes easy to automate the assembly work.

Further, it is not necessary to form a cable insertion hole in the rotating drum or the mounting member, and furthermore, there is no need for a board or adhesive tape for cable connection, and the structure can be simplified by reducing the number of parts.

Furthermore, since the cable connection portion is not exposed to the outside of the rotating drum, wind noise caused by the board and the like can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing a rotating head drum according to an embodiment of the present invention, FIG. 2 is a partially exploded sectional view illustrating the assembly work of the rotating head drum shown in FIG. 1, and FIG. 3 is a conventional rotating head drum. FIG. 4 is a partially exploded sectional view illustrating the assembly work of the rotary head drum shown in FIG. 3. 11... Fixed drum, 12... Rotating shaft, 13...
... Stator, 14 ... Sleeve, 15 ... Rotating drum, 16 ... Magnetic head, 17 ... Rotor.

Claims (1)

[Scope of utility model registration request] A fixed drum that guides the tape, a rotating drum that has a magnetic head that is attached via a mounting member to a shaft supported at the axial center of the fixed drum, and a rotary transformer that transfers signals to the magnetic head. In the rotating head drum, a cylindrical rotary transformer is used as the rotary transformer, a stator transformer is fixed to the fixed drum, and a rotor transformer having an inner diameter larger than an outer diameter of the mounting member is fixed to the rotating drum in advance. A rotating head drum, characterized in that it is fixed to the fixed member.