Disk chucking mechanism

Year	Description
1996	Invention patented by Noboru Takarasawa and Norihide Yoshida on July 10th, 1996. Abstract: In accordance with the invention, a disk chucking mechanism comprises a spindle for engaging the center hole of a metallic hub fastened in the center portion of a disk and a turntable that rotates as a single unit with the spindle. A drive pin is provided for engaging an off-center hole provided in the hub at a location off-center with respect to the center of the hub for regulating the movement of the hub. A chucking magnet is included which is fastened to the turntable for magnetically attracting the hub. The chucking magnet has a plurality of magnetic pieces.
1999	Invention patented by Takahiro Sakaguchi on September 23th, 1999. Abstract: A disk chucking mechanism for selectively chucking floppy disks onto a turntable has a strong neodym first magnet provided on an inner periphery of the turntable so as to attract a first hub and a second hub, and a weaker ferrite second magnet positioned low on an outer periphery of the turntable opposite a projection formed on the second hub and attracting only this second hub. By using these two magnets a satisfactory clamping of the floppy disks to the turntable can be achieved even when both lower grade (ordinary) and upper grade (high-density) floppy disks are loaded and driven.
Source: selected by the editor from original sources.

Invention: Disk chucking mechanism