| 摘要 |
<p>PURPOSE:To miniaturize a head drum device by pressing a contact of the tip of an earth spring against a groove formed on the outer peripheral surface of a boss fixed to the upper end of a supporting shaft. CONSTITUTION:In a head drum device for a VTR, a supporting shaft 26 constitutes a fixed shaft, and a motor is held in a rotary drum 11 in order that the head drum device becomes flat and its dimension in the axial direction becomes small. Also, an earth spring 47 is attached into the rotary drum 11, and a contact 48 provided on the tip of this earth spring 47 is pressed against a groove 50 formed on the outer peripheral surface of a boss 39 which has been fixed to the upper end of the supporting shaft 26. Therefore, press- contacting force is lowered by utilizing a torsion coil spring 47, and the device can be stabilized. In such a way, it becomes unnecessary to project the supporting shaft 26 to the upper part of the drum 11, therefore, the dimension in the axial direction of the whole head drum device is made small, and it can be made light in weight.</p> |
