Device for producing rhythmic movement and vibrating bed having the same

A vibrating bed, comprising:

• a fixed base;
• a movable base;
• and
• a reciprocating device which is disposed between the fixed base and the movable base, wherein the reciprocating device comprises:
• a motor disposed on the fixed base;
• an eccentric wheel which is disposed on the fixed base and is connected to the motor, wherein the eccentric wheel has an eccentric shaft, and the eccentric wheel is driven by the motor to rotate around the eccentric shaft;
• a first pulley disposed on the movable base;
• a first belt which only surrounds the eccentric wheel and the first pulley to form a closed loop, wherein when the motor drives the eccentric wheel to rotate, the eccentric wheel is operatively coupled to the first pulley via the first belt, and the movable base is pulled by the first pulley;
• and
• a recovery mechanism which is disposed on the movable base, and provides a reverse force to the movable base in a direction that is opposite to a direction which the first pulley pulls the movable base;
• wherein the recovery mechanism further comprises a second pulley and a second belt;
• the second pulley is disposed on the movable base and is opposite to the first pulley;
• the second belt only surrounds the eccentric wheel and the second pulley to form another closed loop;
• the first belt and the second belt respectively surround different portions of the eccentric wheel such that the first belt and the second belt do not interfere with each other;
• when the motor drives the eccentric wheel to rotate, the eccentric wheel is operatively coupled to the second pulley and the movable base via the second belt.