US Patent 10137581 Drive for a hair cutting apparatus

A drive assembly for a hair grooming device includes a yoke assembly and a support assembly. The yoke assembly includes a slot that is configured to receive an eccentric drive, and a biased tension arm having a finger at one end, the tension arm configured to engage a blade assembly. The support assembly is coupled to the yoke assembly, the support assembly includes a first arm spaced apart from a second arm, the first and second arms being respectively coupled to the yoke assembly, the yoke assembly being positioned between the first and second arms.