| 摘要 |
An escalator drive machine includes a motor output sheave which drives a drive belt along a closed look between the output sheave and a drive sprocket. The output sheave engages the drive belt with the step chain such that the step chain and attached tread plates are propelled from on landing to the other. The output sheave includes a first set of teeth and a second set of teeth. The first set of teeth is around the output sheave hub to engage a set of belt teeth extending from the drive belt. The second set of teeth is preferably located along a rim of the output sheave and is engageable with corresponding link teeth located along each link in the drive chain. The second set of teeth maintain their relationship with the corresponding link teeth due to the first set of teeth, however, there is no contact therebetween. However, should the drive belt fail or become disengaged, the second set of teeth engage the corresponding link teeth. The step chain and attached tread plates are thereby prevented from moving independently.
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