JPH0289612U

JPH0289612U -

Info

Publication number: JPH0289612U
Application number: JP16871088U
Authority: JP
Priority date: 1988-12-27
Filing date: 1988-12-27
Publication date: 1990-07-16

Description

[Brief explanation of drawings]

第１図はこの考案に係る回転ドラム駆動装置を
示す構成ブロツク図、第２図はこの考案に係る回
転ドラム駆動装置の慣性モーメント可変機構を示
す慣性モーメント可変機構の作用を説明する説明
図、第３図はこの考案に係る回転ドラム駆動装置
の作用を説明するためのブロツク図、第４図はこ
の考案に係る回転ドラム駆動装置の作用を説明す
るためのフローチヤート、第５図はこの考案に係
る回転ドラム駆動装置の第２実施例を示す要部説
明図、第６図はこの考案に係る回転ドラム駆動装
置の第３実施例を示す要部説明図、第７図は従来
の回転ドラム駆動装置を示す正面図、第８図は従
来の回転ドラム駆動装置において回転軸に捩り共
振が発生するのを説明するための説明図、第９図
は第８図に示す回転ドラム駆動装置における捩り
共振の発生を防止するためにフライホイールを取
付けた回転ドラム駆動装置を示す要部正面図であ
る。８…ヘツド、１…回転ドラム、３…回転軸、２
…ロータ、４，２４，２７…慣性モーメント可変
機構、５…検出手段、６…演算手段、７…制御手
段、１２…バイメタル部、１３…錘り部。 FIG. 1 is a configuration block diagram showing a rotary drum drive device according to the present invention, FIG. 2 is an explanatory diagram illustrating the function of the variable moment of inertia mechanism of the rotary drum drive device according to the present invention, and FIG. Fig. 3 is a block diagram for explaining the operation of the rotating drum drive device according to this invention, Fig. 4 is a flowchart for explaining the operation of the rotating drum drive device according to this invention, and Fig. 5 FIG. 6 is an explanatory diagram of main parts showing a second embodiment of the rotary drum drive device according to the invention, FIG. 6 is an explanatory diagram of main parts showing a third embodiment of the rotary drum drive device according to the invention, and FIG. A front view showing the device, FIG. 8 is an explanatory diagram for explaining that torsional resonance occurs in the rotating shaft in a conventional rotary drum drive device, and FIG. 9 shows torsional resonance in the rotary drum drive device shown in FIG. 8. FIG. 2 is a front view of main parts of a rotary drum drive device to which a flywheel is attached in order to prevent the occurrence of. 8...head, 1...rotating drum, 3...rotating shaft, 2
...Rotor, 4, 24, 27... Variable moment of inertia mechanism, 5... Detection means, 6... Calculation means, 7... Control means, 12... Bimetal part, 13... Weight part.

Claims

[Scope of Claim for Utility Model Registration] 1. A head that reads information recorded on a running tape while contacting and sliding on the tape, a rotating drum to which this head is attached, and a rotating shaft attached to the rotating drum. A rotary drum drive device that rotates a drum assembly consisting of a rotor directly connected to the drum assembly by a motor consisting of the rotor and a stator, a variable moment of inertia mechanism for changing a moment of inertia force; a detection means for detecting a time-axis variation of a signal read by the head; and a time-axis variation detected by the detection means and stored in advance. - Calculating means for comparing and calculating the set value, and when the difference between the time axis fluctuation calculated by this calculating means and the set value exceeds a certain value, the control signal according to the difference is transmitted as described above. and a control means for outputting an output to the variable moment of inertia mechanism, and when the drum assembly causes torsional resonance,
A rotary drum drive device characterized in that a variable moment of inertia mechanism operates to change and adjust the moment of inertia of the drum assembly to suppress temporal fluctuations. 2 The variable moment of inertia mechanism is a bimetal whose base end is attached to the rotating shaft and whose distal end protrudes outward, changing the radius of rotation by bending and displacing according to the control signal output from the control means. Claim 1, characterized in that the bimetallic part is composed of a part and a weight part fixed to the distal end side of the bimetal part.
The rotating drum drive device described in .