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The earliest known example of a clockwork set-up is the Antikythera mechanism. This device functioned as a geared analogue computer after its creation during the first-century BCE timeframe, being somewhat astrolabe-like, and had been designed for calculating astronomical positions and particularly listing eclipses.
In many clocks, the outer end is attached to a stationary post. The spring is wound up by turning the arbor, and after winding its force turns the arbor the other way to run the clock. The disadvantage of this open spring arrangement is that while the mainspring is being wound, its drive force is removed from the clock movement, so the clock ...
It is often located on the outside of the movement's front plate, just under the dial. It consists of: A cannon pinion with a hollow shaft that fits friction-tight over the center wheel shaft, projects through the face, and holds the minute hand. While the timepiece is not being set this is turned by the center wheel and drives the minute wheel.
A torsion pendulum clock, more commonly known as an anniversary clock or 400-day clock, is a mechanical clock which keeps time with a mechanism called a torsion pendulum. This is a weighted disk or wheel, often a decorative wheel with three or four chrome balls on ornate spokes, suspended by a thin wire or ribbon called a torsion spring (also ...
A separate set of wheels, the motion work, divides the motion of the minute hand by 12 to move the hour hand and in watches another set, the keyless work, allows the hands to be set. Escapement An escapement is a mechanism that allows the wheel train to advance, or escape a fixed amount with each swing of the balance wheel or pendulum.
Lavet-type stepping motor of a quartz clock. A black rotor sprocket provides the mechanical output. The Lavet-type stepping motor has widespread use as a drive in electro-mechanical clocks [1] and is a special kind of single-phase stepping motor. Both analog and stepped-movement quartz clocks use the Lavet-type stepping motor (see Quartz clock).
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As the clock's gears turn the crown wheel (see animation), one of its teeth catches on a pallet, pushing on it. [13] This rotates the verge and foliot in one direction, and rotates the second pallet into the path of the teeth on the opposite side of the wheel, until the tooth slides off the end of the pallet, releasing it.