US Patent 7114907 Transfer robot

A transfer robot includes a swivel base pivotable about a vertical axis, a hand for holding a plate-like work placed thereon, and a linear transfer mechanism supporting the hand and provided on the swivel base. The transfer mechanism is designed to move the hand forward and backward along a horizontal linear path. The hand is provided with a front stopper for checking a front edge of the work. The swivel base is provided with a work holder contacting a rear edge of the work when the hand is moved to a retracted position on the linear path.