Headgear frame apparatus

A headgear frame apparatus, comprising:

• a head gear frame for clamping a headgear;
• and
• a rotary drive frame for fitting said headgear frame replaceably thereon on the side of a sewing machine,
• wherein said headgear frame is provided at its outer circumference with a brim which is further projected outward;
• on the outer circumference of said rotary drive frame, there are tiltably hinged levers which have hook pawls projected toward said rotary drive frame and which are biased by springs in the direction where the hook pawls approach the rotary drive frame;
• and
• when the headgear frame is fitted on said rotary drive frame the brim once raises the hook pawls in the direction away from the rotary drive frame, and thereafter the hook pawls ride over the brim, the hook pawls being hooked on the brim by the biasing forces of said springs such that leading ends of the hook pawls do not pierce the inner circumference of the headgear frame.