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. |