A process for the treatment of the surface of dielectric films to remove moisture and other contaminants. The panel, an illuminating unit for illumination, and an image unit for performing the imaging are moved relative to each other. The receiving diameter of the collet element can be modified by way of an actuating device. Thus, the present invention can efficiently maintain the effective buffering thickness of the lengthened cushion member, absorb vibration, and prevent from impact between frame members and a cargo box to thus reduce or eliminate noise. The arms then can be released from the closed position by merely letting go of them and allowing the resilient member to spread the arms open to support the garment to be hung.