| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power transmitting device appropriate for being adopted especially for an image forming device which protects members of a driving system and a transmitting system by quickly responding to and detecting excessive load change and immediately stopping operation of a power source motor, wherein a simple structure lowers cost. <P>SOLUTION: A rotating power outputted from the motor M of a rotational driving source is transmitted from a driving gear 3 to a passive gear 4 via a torque limiter 9 and a loading system is actuated from the passive gear 4. The torque limiter 9 cuts off and blocks a mechanical connection of the driving gear 3 and the passive gear when a load of the loading system becomes equal to or larger than a designed value. For the driving gear 3 cut off from the passive gear 4, its rotation is forcibly stopped via a coupling gear 2 and the load in a rotation direction is increased. The rotation of the driving gear 3 is forcibly stopped by butting a circumferential projection 2b on a side of the coupling gear 2 to a fixed projection 6 of a load amplification means, and engaging them and the rotation torque in the rotating direction is increased so that the pulse motor M is stepped out and output is stopped. <P>COPYRIGHT: (C)2009,JPO&INPIT |
