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Sec′tor-wheel.


Gearing.) a. A wheel, or rolling lever, which has the shape of a sector of a circle, a portion bounded by two radii and an arc.

It is used as a gear-wheel in machines when an impulse of moderate length is required, and has a reciprocating rotary motion.

In the illustration shown, — as an example of the use of a sector-wheel, — it is embodied in a form of baling-press, in which the followers f f are coincidently advanced or retracted, to press the bale or open for a new charge, as the case may be The right and left hand screws of the shaft t operate cogged sectors t t′, whose oscillation actuates the toggles h m m′ by which the followers are mutually approached to press the hay, etc., into the compass of a bale.

Sector-wheel baling-press.

The motion derived from the worms on the shaft is imparted by means of three sector-gears, at each end, to toggles which move in unison, and are pivoted to different parts of the follower, so as to make it move squarely in the box.

b. A cog-wheel whose perimeter is formed of sectors of varying radii, imparting a variable motion to a wheel of counterpart form. A variable wheel.

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