Device for clamping a flexible disk

A collet means for engagement with a spindle hub for centering and clamping an annular flexible disk on the spindle hub, said collet means comprising:

• a collet having a plurality of radially extending petal-like portions therearound for centering the annular disk on the spindle hub when the collet means engages the spindle hub, each of said petal-like portions having a flange integral therewith for pressing a surface portion of the annular disk against the spindle hub to clamp the annular disk when the collet means engages the spindle hub, and each of said petal-like portions having a first stop portion integral therewith and extending therefrom;
• a collet shaft on which said collet is mounted;
• a regulating body on said collet and having stops thereon extending outside of said first stop portions of said petal-like portions and engagable by said first stop portions for limiting the outward movement of said petal-like portions during an increase in the diameter of said collet;
• and
• an enlarging spring on said regulating body and having legs thereon engaging said petal-like portions for urging said petal-like portions outwardly for increasing the diameter of said collet.