Transfer method to drag grip target object

1. A transfer method using a transfer apparatus,

the transfer apparatus comprising:

an arm including a rotation fulcrum portion; and

first and second grip portions connected to the rotation fulcrum portion and turnable around the rotation fulcrum portion,

the transfer method comprising:

gripping a first surface of a grip target object mounted on a mounting surface by the first grip portion;

gripping a second surface crossing the first surface of the grip target object by the second grip portion;

lifting the arm together with the first and second grip portions, to lift the grip target object;

(1) turning the first and second grip portions, to tilt the grip target object with respect to the mounting surface and bring the grip target object into contact with the mounting surface;

subsequently to (1), (2) maintaining the grip target object in a state of being tilted with respect to the mounting surface and in contact with the mounting surface; and

subsequently to (2), (3) moving the arm together with the first and second grip portions, to drag the grip target object in contact with the mounting surface to a movement conveyor along the mounting surface in the state of being tilted.

2. The transfer method of claim 1 , wherein when the grip target object is lifted, the first and second grip portions are naturally turned according to a weight of the grip target object, to tilt the grip target object with respect to the mounting surface.