Patent ID: 7971864

Claim:
A device for positioning a columnar structure, the columnar structure having a central axis, the device comprising: a seat having a surface and a central axis that is substantially perpendicular to the surface of the seat, the seat being configured to mount the columnar structure thereon; a positioning fixture configured to move at a first side of the seat in a direction parallel with the surface of the seat and to abut on the seat; and a positioning adjustment fixture provided to face the positioning fixture on a second side of the seat, the second side being across the seat from the first side, the positioning adjustment fixture configured to move in a direction parallel with the surface of the seat, wherein, after the positioning fixture has abutted on the seat, the positioning adjustment fixture abuts on the columnar structure and causes the columnar structure to move along the surface of the seat and to abut on the positioning fixture, thereby causing the central axis of the columnar structure to approximately coincide with the central axis of the seat, wherein one of the positioning fixture and the positioning adjustment fixture has a first rectangularly concave cross-section, the first rectangularly concave cross-section including a first inner concave section between first outer fingers, the first inner concave section being a rectangular cross section.