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Rotary shears
(gcide) | Shears \Shears\, n. pl. [Formerly used also in the singular. See
Shear, n., 1.]
1. A cutting instrument. Specifically:
(a) An instrument consisting of two blades, commonly with
bevel edges, connected by a pivot, and working on both
sides of the material to be cut, -- used for cutting
cloth and other substances.
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Fate urged the shears, and cut the sylph in
twain. --Pope.
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(b) A similar instrument the blades of which are
extensions of a curved spring, -- used for shearing
sheep or skins.
(c) A shearing machine; a blade, or a set of blades,
working against a resisting edge.
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2. Anything in the form of shears. Specifically:
(a) A pair of wings. [Obs.] --Spenser.
(b) An apparatus for raising heavy weights, and especially
for stepping and unstepping the lower masts of ships.
It consists of two or more spars or pieces of timber,
fastened together near the top, steadied by a guy or
guys, and furnished with the necessary tackle.
[Written also sheers.]
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3. (Mach.) The bedpiece of a machine tool, upon which a table
or slide rest is secured; as, the shears of a lathe or
planer. See Illust. under Lathe.
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Rotary shears. See under Rotary.
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Rotary shears
(gcide) | Rotary \Ro"ta*ry\, a. [L. rota a wheel. See Roll, v., and cf.
barouche, Rodomontade, Rou['e], Round, a., Rowel.]
Turning, as a wheel on its axis; pertaining to, or
resembling, the motion of a wheel on its axis; rotatory; as,
rotary motion.
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Rotary engine, steam engine in which the continuous
rotation of the shaft is produced by the direct action of
the steam upon rotating devices which serve as pistons,
instead of being derived from a reciprocating motion, as
in the ordinary engine; a steam turbine; -- called also
rotatory engine.
Rotary pump, a pump in which the fluid is impelled by
rotating devices which take the place of reciprocating
buckets or pistons.
Rotary shears, shears, as for cloth, metal, etc., in which
revolving sharp-edged or sharp-cornered wheels do the
cutting.
Rotary valve, a valve acting by continuous or partial
rotation, as in the four-way cock.
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