Robot including stopper

1. A robot, comprising:

a first component;

a second component movably coupled to the first component;

a first stopper provided at one of the first component and the second component, and extending along a rotational axis parallel to a rotational movement direction of the second component relative to the first component, the first stopper being configured such that a length thereof in a direction of the axis from a first end of the first stopper in the direction of the axis to a second end of the first stopper opposite the first end is variable; and

a second stopper provided at the other of the first component and the second component, and configured to contact the first end or the second end of the first stopper so as to limit a movement range of the second component relative to the first component when the second component moves relative to the first component, wherein

the first stopper comprises:

a fixed member fixedly provided at the one of the first component and the second component, and defining the first end;

a movable member attached to the fixed member so as to be slidable in a rotational direction of the rotational axis, and defining the second end; and

a locking mechanism configured to lock the movable member to the fixed member so as to restrict movement of the movable member relative to the fixed member, the locking mechanism being configured to lock the movable member with respect to the fixed member at a plurality of positions such that the length of the first stopper is variable, wherein

the moveable member is configured to move to change the length of the first stopper.

2. The robot according to claim 1 , wherein the second stopper extends along the axis.

3. The robot according to claim 1 , wherein the second component is rotatably coupled to the first component.