. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. ies by levers y y, vibrating upon fulcrum pivots at w xv. To these levers per-I)endicular rods, z z, are connected by joints, and the lower end of each of these rods isattached to an eccentric disc, roller, ur crank, x x, on the axle of the brush barrel; whenceit will be perceived that by the rotation of the eccentrics x, the levers y will be made tovibrate and strike ofl, or dofi the low or other material from the card barrels, in a similarmanner to the operations of the doffing co
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. ies by levers y y, vibrating upon fulcrum pivots at w xv. To these levers per-I)endicular rods, z z, are connected by joints, and the lower end of each of these rods isattached to an eccentric disc, roller, ur crank, x x, on the axle of the brush barrel; whenceit will be perceived that by the rotation of the eccentrics x, the levers y will be made tovibrate and strike ofl, or dofi the low or other material from the card barrels, in a similarmanner to the operations of the doffing comb of an ordinary carding engine. Mr. Evanss patent improvements in machinery for preparing and dressing flax andhemp apply, first, to the operation of scutching, swingling, or beating away the boomor woody particles of the rind wliich covers the flax, or hemp, in its rough state; and,secondly, to the subsequent operation of heckling, combing, or opening of the fibres ofthe material preparatory to spinning it into yarns. Fig. 428 represents the scutching or swingling machine, in different positions. 429 428. Fig. 428 is an end view of the machine in operation ; fig. 429 is a front view of tliesame. The essential parts of the machine, and those in which the invention especiallyconsists, are two pairs of revolving beaters or scutchers, each formed by long ribs orblades mounted upon arms. The blades of the beaters, a a, may be made of ribs of hardwood, or other suitable material, broad but thin, and slightly rounded on their edges, toprevent their cutting the fibres of the flax or hemp when they strike it. The two bladesare placed parallel to each other, and mounted upon a hexagonal frame, the arms b binclining or forming obtuse angles with the blades, and from the middle of the arms shortaxles, c c, extend, upon which the beaters revolve. The axles of both pairs of beaters are mounted in pinmmer boxes, bearing upon hori-zontal rails at the ends of the machine, as shown in fig- 42
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
