JPH02128236U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本案に係るドラム組立体の第１の実施
例を示す断面図、第２図は本案の第２の実施例を
示す断面図、第３図は本案の基本原理図、第４図
は従来例を示す断面図である。 １４……回転軸、１２……回転ドラム、１１…
…モータ、１１１……ロータ、２１……慣性体、
２２……回転ドラム、２１′……慣性体、２１′
ａ……溝、Ａ−Ａ……節断面。 Figure 1 is a cross-sectional view showing a first embodiment of the drum assembly according to the present invention, Figure 2 is a cross-sectional view showing a second embodiment of the present invention, Figure 3 is a diagram of the basic principle of the present invention, and Figure 4 is a sectional view showing a conventional example. 14... Rotating shaft, 12... Rotating drum, 11...
...Motor, 111...Rotor, 21...Inertial body,
22... Rotating drum, 21'... Inertial body, 21'
a... Groove, A-A... node cross section.

Claims (1)

【実用新案登録請求の範囲】 (1) 固定ドラムの中心を貫通して回転軸が回転
可能に軸支され、その下方への突出部にヘツド駆
動モータのロータが取付けられると共に、上方へ
の突出部に磁気ヘツドを有する回転ドラムが装着
された磁気録画再生装置のドラム組立体において
、 前記回転軸の前記回転ドラムから前記モータロ
ータと反対側への突出部に慣性体を装着し、前記
回転軸両端に生ずる正・負逆方向の捩れ振動が“
０”となる節断面の位置に前記回転ドラムの質量
中心を配置したことを特徴とするドラム組立体。 (2) 前記慣性体を粘弾性体で形成したことを特
徴とする請求項(1)に記載のドラム組立体。 (3) 粘弾性を有する慣性体が樹脂により形成さ
れていることを特徴とする請求項(1)に記載のド
ラム組立体。 (4) 回転ドラムを薄型円板状に形成し、該回転
ドラムから延長された回転軸の延長端部に前記回
転ドラムと同径の慣性体を装着し、該慣性体の周
面にテープと摺接する溝を複数条形成したことを
特徴とする請求項(1)に記載のドラム組立体。[Claims for Utility Model Registration] (1) A rotary shaft is rotatably supported through the center of the fixed drum, and the rotor of the head drive motor is attached to the downwardly protruding portion of the rotating shaft, and the rotary shaft protrudes upwardly. In a drum assembly of a magnetic recording/reproducing device, in which a rotating drum having a magnetic head is attached to a drum assembly of a magnetic recording/reproducing device, an inertial body is attached to a protruding portion of the rotating shaft from the rotating drum to a side opposite to the motor rotor, and The torsional vibration in opposite directions of positive and negative that occurs in “
A drum assembly characterized in that the center of mass of the rotating drum is located at a position of a nodal cross section that is 0''. (2) Claim (1) characterized in that the inertial body is formed of a viscoelastic body. The drum assembly according to claim 1. (3) The drum assembly according to claim 1, characterized in that the inertial body having viscoelasticity is formed of resin. (4) The rotating drum is formed into a thin disk shape. an inertial body having the same diameter as the rotating drum is attached to the extended end of a rotating shaft extending from the rotating drum, and a plurality of grooves are formed on the circumferential surface of the inertial body for sliding contact with the tape. The drum assembly according to claim (1).