JPH01279402A - Rotary head drum device - Google Patents

Abstract

PURPOSE:To position a stator simply with high accuracy by providing a support member having the stator of a 2nd rotary transformer at its lower face to a shaft freely turnably and restricting the support member by a restricting member. CONSTITUTION:The stator 22A of the 2nd rotary transformer 22 is fitted to the lower face of the support member 30 in addition to a 1st conventional rotary transformer 12 and the support member 30 is penetrated to a drum shaft 14 through a bearing 32 freely turnably. Moreover, a restricting member 40 restricting the support member 30 is fixed to a stator member 44 such as a drum base by a screw 42. Thus, the parallelism and concentricity of the stator 22A of the 2nd rotary transformer 22 with respect to the rotor 22B is adjusted with high accuracy by turning the support member 30 in case of positioning the stator 22A of the 2nd rotary transformer 22 and the stator is fixed simply to a prescribed position by the turning restricting member 40.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a rotating head drum device, and in particular, in addition to a rotary transformer between a rotating drum and a fixed drum, another rotary transformer is mounted on the upper part of the rotating drum. The present invention relates to a rotary head drum device having such a structure.

[Conventional technology]

Conventionally, (i-Fi VTRs, 9-head VTRs, etc.) have a large number of heads, and the number of channels in the rotary transformer increases accordingly. In addition to the rotary transformer, there is a rotating head drum device with another rotary transformer mounted on top of the rotating drum.

The rotary transformer on the upper part of the rotary drum of this rotary head drum device is separated by a rotor part of the rotary transformer disposed on the upper surface of the rotary drum and a supporting member fixed to the chassis so as to face the rotor part. It consists of a stator section of a rotary transformer that is held and supported.

[Problem that the invention seeks to solve]

However, the support member that supports the stator part of the conventional rotary transformer in a cantilever manner includes an adjustment member for adjusting the parallelism and spacing with the rotor part of the rotary transformer, and the structure is large-scale and complicated. There was a problem in that adjustments, etc., were also complicated.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a rotary head drum device in which a stator member of a rotary transformer can be easily and precisely attached to the upper part of the rotary drum.

- [Means for solving the problem] In order to achieve the above-mentioned object, the present invention includes a fixed drum fixed on a fixed member and having a stator section of a first rotary transformer, and a fixed drum that rotates with respect to the fixed drum. a rotating drum that is fixed to a freely penetrating drum shaft, has a head chip attached to its outer peripheral surface so that the head protrudes, and has rotor parts of first and second rotary transformers on the lower and upper sides thereof, respectively; Said Drumn.

a holding member that is rotatably inserted through the foot and has a stator portion of the second rotary transformer on its lower surface so as to face the rotor portion of the second rotary transformer; It is characterized by comprising a rotation prevention member that prevents rotation of the member.

[Effect]

According to the present invention, since the holding member having the stator portion of the second rotary transformer on the lower surface is rotatably inserted into the drum shaft, the stator portion is attached to the rotor portion of the second rotary transformer of the rotary drum. Can be installed with high precision. Further, the rotation preventing member fixed on the fixed member only needs to be able to prevent rotation of the holding member, and can be made of a much simpler member such as a sheet metal member than a conventional supporting member that supports the holding member in a cantilever manner.

〔Example〕

Preferred embodiments of the rotary head drum cover according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a plan view of a rotary head drum device according to the present invention, and FIG. 2 is a sectional view taken along line 8-Δ in FIG.

As shown in these drawings, this rotating head drum device mainly includes a fixed drum 10, a rotating drum 20, a holding member 30, and a rotation preventing member 40.

The stator portion 12A of the first rotary transformer 12 is disposed on the fixed drum 10, and a bearing 16.16 of the drum shaft 14 is disposed thereon. This fixed drum 10 is fixed to the chassis via a drum stand (not shown).

A flange member 18 is fitted onto the drum shaft 14, and the drum shaft 14 extends through the stationary drum 10 and is rotatably supported by bearings 16.16.

A rotary drum 20 is fitted into the flange member 18, and a rotor portion 12B of the first rotary transformer 120 and a rotor portion 22B of the second rotary transformer 22 are disposed on the lower surface side and the upper surface side of the rotary drum 20, respectively. is installed.

A Radchip 24 is attached so that the head protrudes from the outer peripheral surface of the rotating drum 20.
are electrically connected to the windings of the corresponding channels of the rotor parts 12B and 22B of the first and second rotary transformers via the relay board 26. As shown in FIG. 2, each of the first and second rotary transformers has four channels of windings arranged on a concentric circle, and thus a total of eight head chips are provided.

The stator portion 22Δ of the second rotary transformer 22 is disposed on the holding member 30, and bearings 32.32 are disposed on the holding member 30.
is arranged, and this holding member 30 has bearings 32.32
The drum shaft 14 is rotatably inserted through the drum shaft 14 . Note that 34 is a stopper that prevents the holding member 30 from moving in the axial direction of the drum shaft 14.

Further, the rotation preventing member 40 is formed of, for example, a sheet metal member, and includes two arm portions 40A that sandwich the holding member 30.
, 40A. And this rotation prevention member 40
As shown in FIG. 3, which is a side view of the rotation preventing member 40 shown in FIG.
Rotation of the holding member 30 is prevented by Δ and 40A.

A stator portion of a drum motor (not shown) is disposed on the lower surface of the fixed drum 10, and a rotor portion of the drum motor is disposed on the drum shaft 14. The rotating drum 20 is rotatable.

According to the rotary head drum device having the above configuration, the holding member 3
0, the rotational power of the drum shaft 14 is not transmitted by the bearings 32, 32, and the rotation of the holding member 30 is prevented by the rotation prevention member 40, so that the rotating drum 2
It is fixed at a constant position regardless of rotation.

Since this holding member 30 is inserted through the drum shaft 14, the stator section 22A of the second rotary transformer 22 disposed on the lower surface thereof is positioned with high precision with respect to the rotor section 22B on the upper part of the rotating drum 20. be able to. That is, the parallelism and concentricity between the stator section 22A50 and the stator section 22B of the second rotary transformer 22 can be made highly accurate, and the interval therebetween can also be set to a desired value. In addition, the second rotary transformer 2
The distance between the stator portion 22A10 and the stator portion 22B of the second stator portion 22B is determined by the distance between the upper end of the flange member 18 and the bearing 32 provided on the holding member 30.
The desired thickness can be easily adjusted by interposing a shim of the desired thickness between the lower end of the shim and the lower end of the shim.

〔Effect of the invention〕

As explained above, according to the rotary head drum device according to the present invention, the stator portion of the rotary transformer provided on the upper part of the rotary drum can be mounted with high precision with a simple structure, and assembly 11 can be easily performed. be able to.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of a rotary head drum device according to the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. FIG. 10... Fixed drum, 12... First rotary transformer, 12Δ, 22Δ... Stator section, 1
2B, 22B... Rotor portion, 14... Drum shaft, 20... Rotating drum, 22... Second rotary transformer, 24... Head chip, 30... Holding member, 40...・Rotation prevention member.

Claims (1)

[Scope of Claims] A fixed drum fixed on a fixed member and having a stator portion of a first rotary transformer, and fixed to a drum shaft that rotatably penetrates the fixed drum, and a head chip is attached to the outer periphery of the fixed drum. At the same time, the first and second
a rotating drum having a rotor portion of a rotary transformer; a rotating drum rotatably inserted into the drum shaft;
a holding member having a stator portion of the second rotary transformer on its lower surface so as to face the rotor portion of the second rotary transformer; and a rotation preventing member fixed on the fixing member to prevent rotation of the holding member. A rotary head drum device comprising: .