Rotary apparatus

A rotary apparatus comprising:

• a base unit that includes a casing defining a receiving space and having:
• a top surface,
• a top sunk opening that opens upwardly via said top surface, and
• an axial hole that communicates with said top sunk opening and said receiving space, said top sunk opening and said axial hole extending coaxially along an axial line;
• a top adjusting disc unit that is rotatably fixed in said top sunk opening and that has:
• a top inner surrounding surface defining a top inner hole that extends along a central line, the central line being parallel to and offset from the axial line, and
• a top outer surrounding surface surrounding said top inner surrounding surface, extending along the axial line, and being non-coaxial with said top inner surrounding wall;
• a drive unit that is mounted in said base unit;
• a gear mechanism that is mounted in said base unit and that has:
• an active gear unit driven rotatably by said drive unit, and
• a passive gear unit disposed in said axial hole, and connected to and driven rotatably by said active gear unit, said passive gear unit having an output shaft that extends along the central line, said output shaft having an output end portion that extends outwardly from said top sunk opening and said axial hole, and a top support portion that is connected to said output end;
• and
• a bearing unit that includes a top bearing sleeved on said top support portion of said output shaft and clamped between said top support portion and said top inner surrounding surface of said top adjusting disc unit.