Rotary actuator with cushion mechanism

A rotary actuator with a cushion mechanism comprising:

• a circular cylinder hole provided in a casing;
• a rotatable rotor provided in a center portion of said cylinder;
• one vane mounted to said rotor and swinging and rotating in normal and reverse directions within said cylinder hole;
• two packings mounted at different positions on said vane;
• a stopper defining a rotational terminal position of said vane;
• two pressure chambers formed between said vane and said stopper;
• two supply ports for supplying a compressed air to said pressure chambers;
• and
• an air pressure type cushion mechanism for stopping said vane at a rotational terminal end position in at least one of normal and reverse directions in a cushioning manner,
• wherein said cushion mechanism has a first opening for discharging an exhaust air pressed out from said pressure chamber by a rotating vane to an external portion without limiting a flow amount, a second opening for discharging the exhaust air to the external portion in a state of limiting a flow amount and a flow amount adjusting mechanism for limiting a flow amount, said flow amount adjusting mechanism being connected to said second opening, and
• wherein said first opening is provided at a position sealed between said two packings before said vane of a hole surface in said cylinder hole reaches a rotational terminal end position, said second opening is provided at a position which is not sealed between said packings after said vane reaches the rotational terminal end position, said first opening is connected to one of the supply ports by the through hole within the casing, and said second opening is connected to the same supply port via said flow amount adjusting mechanism.

A rotary actuator with a cushion mechanism comprising:

• a circular cylinder hole provided in a casing;
• a rotatable rotor provided in a center portion of said cylinder;
• first and second vanes mounted to said rotor and swinging and rotating in normal and reverse directions within said cylinder hole;
• two stoppers defining rotational terminal positions of said respective vanes;
• two pressure chambers formed between said first vane and both of said stoppers;
• two supply ports for supplying a compressed air to said respective pressure chambers;
• and
• two cushion chambers formed between said second vane and both of the stoppers;
• breathing ports for opening said respective cushion chamber to an external portion;
• and
• an air pressure type cushion mechanism for stopping said second vane at a rotational terminal end position in at least one of normal and reverse directions in a cushioning manner,
• wherein said cushion mechanism has a first opening for discharging an exhaust air pressed out from said cushion chamber by a rotating second vane from said breathing port without limiting a flow amount, a second opening for discharging the exhaust air in a state of limiting a flow amount and a flow amount adjusting mechanism for limiting a flow amount, said flow amount adjusting mechanism being connected to said second opening, and
• wherein said first opening is provided at a position shut from said cushion chamber by said second vane before said second vane of a hole surface in said cylinder hole reaches a rotational terminal end position, and said second opening is provided at a position which is not sealed by said second vane after said second vane reaches the rotational terminal end position.