Patent ID: 8864436

Claim:
An alignment device of a cutting machine, comprising a stand and a ball transfer unit mounted on the stand, the ball transfer unit comprising a main body, a first rotating body, and a plurality of second rotating bodies arranged between the main body and the first rotating body, the main body having an end forming a receiving chamber and thus forming a receiving chamber sidewall that defines a spherically curved surface, the second rotating bodies being rotatably arranged on the spherically curved surface of the receiving chamber sidewall, the main body forming an air entrance passage in communication with the receiving chamber for supplying an airflow to the receiving chamber, the receiving chamber sidewall comprising a raised portion extending from the spherically curved surface of the receiving chamber sidewall and circumferentially surround the air entrance passage so that the second rotating bodies are rollable circumferentially around the air entrance passage, the raised portion forming a bearing section that surrounds and delimits the air entrance passage and spaces the first rotating body from the spherically curved surface, the bearing section having a side surface in which air outlet ports are formed for each supplying air into the receiving chamber in a direction substantially tangential to the surface of the receiving chamber sidewall, the receiving chamber sidewall having a free end forming a stop rim, whereby the second rotating bodies are confined between the stop rim and the bearing section, the main body having an opposite end forming a connection section that is mateable and coupleable to the stand.