| 摘要 |
PURPOSE:To make the turning of a directional angle of an antenna at the outside of the range of a specified shift angle possible, by providing the 1st driving device turning the antenna within a specified shift angle and the 2nd driving device turning the antenna at the outside of a specified shift angle. CONSTITUTION:The 2nd driving device 9 rotates a sprocket 13 engaged with a chain 12 fixed to an outer circumference of a mount base 3 of a base stand 2 via a coupling 11 with a geared motor fitted to a rotary shaft 1. The coupling between a pin bearing 6 of the 1st driving device 5 and the rotary shaft 1 is released and the geared motor 10 is rotated while the coupling 11 is coupled. Since the rotary shaft 1 delivers the torque of the motor 10 to a sprocket 13, the shaft 1 rotates the outer circumference of the chain 12. When a specified shift angle of the 1st driving device 5 is exceeded, the 2nd driving device 9 takes over the 2nd shift angle. |
