| 摘要 |
A roller drive unit to propel objects along a conveyor track is disclosed. The roller drive unit comprises a drive roller (30), which can be raised by a lifting mechanism (40) from a lower, resting position into an upper, operating position. The drive roller (30) is powered by an electric motor (20) and a main gear arrangement (50, 55, 60, 34). A first controllable braking mechanism (70) is provided, with which the lifting mechanism (40) can be locked and as a result the drive roller (30) can be kept in an upper, operating position. In addition a second controllable braking mechanism (80) is provided, which acts on the drive shaft of the electric motor (20) and which can prevent rotation of the drive roller (30) even when the electric motor (20) is turned off. When the second braking mechanism (80) is released while the electric motor is turned off (20), an object to be propelled can be shifted over the raised drive roller (30) in a simple manner.
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