Definition

Noun: A fusee drive is a spirally grooved spindle (a cone-shaped pulley) used in certain mechanical clocks and watches. Its primary function is to counteract the diminishing power output of the uncoiling mainspring, ensuring a more consistent force is delivered to the gear train over time.

Usage

The term fusee drive specifically refers to the component and its mechanism within a timepiece. It is a technical term used in horology (the study and art of timekeeping devices).

Examples

• The antique pocket watch was prized for its intricate fusee drive mechanism.
• To maintain accurate timekeeping, the clockmaker repaired the fusee drive.
• The fusee drive equalizes the torque from the mainspring as it unwinds.

Advanced Usage

• The fusee drive is often connected to the mainspring barrel by a fine chain or cord. As the mainspring loses power, the chain pulls on a smaller diameter of the fusee cone, effectively increasing the leverage and maintaining consistent force.

Variants and Related Words

• Fusee (noun): Often used interchangeably with fusee drive to refer to the conical pulley itself.
• Fusee chain (noun): The chain connecting the mainspring barrel to the fusee cone.

Synonyms

• Fusee (in the context of the component)
• Conical pulley (descriptive, but not a technical synonym in horology)

Antonyms

• Direct drive (a mechanism where the mainspring drives the gear train directly without a torque-equalizing component like a fusee).

Noun

1. a spirally grooved spindle in a clock that counteracts the diminishing power of the uncoiling mainspring