JPH01315018A - Rotary head drum device - Google Patents

Abstract

PURPOSE:To attach an upper drum to a head disk in a simple constitution and with high accuracy by supporting rotatably the upper drum via a drum shaft and at the same time preventing the rotation of the upper drum via a rotation preventing part. CONSTITUTION:An upper drum 20 is inserted rotatably into an upper drum shaft of a head disk 18 via a baring 16. While a parallel plane 20A is formed on the outer circumferential surface of the upper end of the bearing part of the drum 20. A rotation preventing member 30 holds the plane 20A via an arm part 30A to prevent the rotation of the drum 20. Therefore the rotation of the shaft 14 is not transmitted to the drum 20 via the bearing 16. Furthermore the drum 20 is fixed at a constant position since the rotation of the drum 20 is prevented by the member 30. In such a constitution, the drum 20 is inserted into the shaft 14 and at the same time the rotation of the drum 20 is prevented. As a result, the drum 20 can be attached to the disk 18 in simple constitution and with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary head drum device in which upper and lower drums are fixed, and more particularly to a rotary head drum device with improved support means for the upper drum.

[Conventional technology]

This type of rotary head drum device is mainly composed of a lower drum, a head disk, an upper drum, and a support member for the upper drum.

The lower drum is fixed to a storage such as a VTR via a drum stand. The stator section of the rotary transformer is disposed above the lower drum. The drum shaft is disposed coaxially with the lower drum, rotatably supported by the chassis, and connected to the rotor portion of the motor.

Further, a head disk is fixed to the drum shaft above the lower drum. A head chip is attached to the outer periphery of the head disc, and a rotor portion of the rotary transformer is disposed on the lower surface of the head disc. The upper drum is
It is cantilever-supported by the chassis above the head disc via a support member.

[Problem that the invention seeks to solve]

However, the support member that cantilevers the upper drum is
The problem is that the structure is large-scale and complicated, including an adjustment member for adjusting the parallelism with the head disk and the gap, and the assembly and adjustment are also complicated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rotating head drum device in which an upper drum can be attached easily and with high precision.

[Means for solving problems]

In order to achieve the above object, the present invention includes a lower drum which is fixed to a main body via a fixing member and has a stator of a rotary transformer on the upper part, and a drum shaft which rotatably penetrates the lower drum. A head chip is attached to the outer periphery of the head disc, and the head disc has a rotor portion of a rotary transformer on the lower side thereof, an upper drum rotatably inserted into the drum shaft, and is fixed to the main body side via a fixing member. and a rotation prevention member that prevents rotation of the upper drum.

[Effect]

According to the present invention, since the upper drum is rotatably supported on the drum shaft, the upper drum can be attached to the head disc with high precision. Further, the rotation prevention member fixed on the fixed member only needs to be able to prevent rotation of the upper drum, and can be constructed of a much simpler member such as a sheet metal member than a conventional support member that supports the upper drum in a cantilevered manner.

〔Example〕

Preferred embodiments of the rotary head drum device 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 A--A in FIG. 1.

As shown in these drawings, this rotary head drum device mainly includes a lower drum 1O, an upper drum 20, a head disc 18-, and a rotation prevention member 30.

A stator portion 12A of a rotary transformer 12 is disposed on the lower drum 10, and bearings 16, 16 of a drum shirt 14 are disposed thereon.

This lower drum 10 is fixed to the chassis via a drum stand (not shown).

The drum shaft 14 passes through the lower drum 10 and attaches to the bearing 1.
It is rotatably supported by 6.16. Further, a head disc 18 is fixed to the drum shaft 14 above the lower drum 10, and a rotor part 12B of the rotary transformer 12 is disposed on the lower surface of the head disc 18. It faces the stator section 12A.

A head chip 24 is attached to the head disc 18, and the head chip 24 protrudes from the outer peripheral surfaces of the lower drum 10 and an upper drum to be described later. This head chip 24 is electrically connected to the winding of the corresponding channel of the rotor section 12B of the rotary transformer 12.

An upper drum 20 is connected to the drum shaft 14 above the head disc 18 via a bearing 16.16.
It is rotatably inserted into the This upper drum 20
On the outer peripheral surface of the upper end of the central bearing part, planes 2OA and 208 which are parallel to each other are formed. Note that 26 is a stopper that restricts the bearing 16 from moving in the axial direction of the drum shaft 14.

The rotation prevention member 30 is made of, for example, a sheet metal member, and has two arms 1130A and 30A that sandwich the flat surfaces 2OA and 2OA of the upper drum 20.

The rotation prevention member 30 is fixed on a fixed member 32 such as a chassis or a drum stand, and its arm portion 30A
, 30A prevent the upper drum 20 from rotating.

Incidentally, a rotor portion of a motor (not shown) is disposed on the drum shaft 14, and the drum shaft 14 can be rotated by the drum motor.

According to the rotary head drum device having the above configuration, the upper drum 2
0, the rotational power of the drum shaft 14 is not transmitted by the bearings 16 and 16, and the rotation of the upper drum 20 is prevented by the rotation prevention member 30, so the rotation of the rotation drum 2
It is fixed at a constant position regardless of rotation.

Since the upper drum 20 is inserted through the drum shaft 14, it can be positioned with high precision with respect to the head disc 18. That is, the upper drum 20, the head disc 1
The parallelism and concentricity between 8 can be made highly accurate, and it can be easily installed. Further, the gap between the upper drum 20 and the head disc 18 can be easily adjusted by interposing a height adjusting shim between them.

〔Effect of the invention〕

As explained above, according to the rotary head drum device according to the present invention, the upper drum provided above the head disc can be
It has a simple structure and can be installed with high precision.

[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, and FIG. 2 is a sectional view taken along line A--A in FIG. 1. DESCRIPTION OF SYMBOLS 10... Lower drum, 12... Rotary transformer, 12A... Stator part, 12B... Rotor part, 14... Drum shaft, 18... Head disk, 20... Upper drum, 24... Head chip, 30... Rotation prevention member.

Claims (1)

[Claims] A lower drum that is fixed to the main body via a fixing member and has a stator section of a rotary transformer on the upper part, and a drum shaft that rotatably penetrates the lower drum and has a head chip on its outer periphery. a head disk having a rotor portion of a rotary transformer on its lower side; an upper drum rotatably inserted through the drum shaft; A rotating head drum device comprising: a rotation preventing member that prevents rotation; and a rotating head drum device.