Patent ID: 8627949

Claim:
A transmission mechanism, comprising: a feeder; a tension maintaining module positioned on the feeder; a belt furling module positioned on the feeder and under the tension maintaining module, the belt furling module comprising a motor and a rolling wheel driven by the motor; and a carrier belt running along the feeder, the tension maintaining module, and the belt furling module in that order; wherein the tension maintaining module comprises a base, a pivot shaft slidably positioned on the base, and an elastic member sleeved on the pivot shaft; when the carrier belt becoming slack, the elastic member releases a spring pressure to drive the pivot shaft to move away relative to the base, thereby maintaining the tension in the carrier belt, the tension maintaining module further comprises a circuit board, a first inductor, a second inductor, and a baffle plate; the base, the first inductor, and the second inductor are positioned in that order on the circuit board, the baffle plate is fixed to an end of the pivot shaft near the second inductor, and the pivot shaft drives the baffle plate to move between the first inductor and the second inductor, when the baffle plate arrives at the first inductor, the circuit board sends a signal to the belt furling module to start the motor, and when the baffle plate arrives at the second inductor, the circuit board sends a signal to the belt furling module to stop the motor.