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Maintaining power
In horology, a maintaining power is a mechanism for keeping a clock or watch going while it is being wound.
==Huygens==
The weight drive used by Christiaan Huygens in his early clocks acts as a maintaining power. In this layout, the weight which drives the clock is carried on a pulley and the cord (or chain) supporting the weight is wrapped around another pulley which has spikes which allow the cord to turn the pulley without slipping. It is this pulley which turns the train of gears in the clock movement. The cord is kept in engagement with this pulley by a small tensioning weight which is also carried on its own pulley. The cord is endless and is looped over a fourth pulley before going back to the drive weight. The fourth pulley also has spikes to stop the cord slipping and has a ratchet that only allows it to turn in one direction. As the drive weight descends and turns the clock, the tensioning weight rises. When the drive weight needs to be re-wound, either the fourth pulley is turned directly to lift the weight or the cord supporting the tensioning weight is pulled down and draws the fourth pulley round with it.
The principle was later applied by the French clockmaker Robert Robin who automated the re-winding in his remontoire. The drive- and tensioning-weights were made much smaller and drove the escape wheel directly. It was re-wound by the main train of the clock which turned the fourth pulley and was controlled by a lever attached to the tensioning weight. When this had risen to its upper limit, it started the re-winding process. As the drive weight rose, the tensioning weight fell and at the bottom of its travel it stopped the re-winding.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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