The Artizan . s Patent Curvilinear Machines is different from that of machinespreviously made and intended for accomplishing the same objects. In mostof these latter, the timber to be operated upon is moved in a straight line,being a chord of the curve to be obtained, the saws being moved laterallyand turned round their centres in an oblique direction, so as to meet theline to be followed on the timber. In the machines now under notice, and illustrated in the accompanyingPlate and woodcut, the position of the saws is constant, excepting a slightlateral motion to produce the taper, and the wood
The Artizan . s Patent Curvilinear Machines is different from that of machinespreviously made and intended for accomplishing the same objects. In mostof these latter, the timber to be operated upon is moved in a straight line,being a chord of the curve to be obtained, the saws being moved laterallyand turned round their centres in an oblique direction, so as to meet theline to be followed on the timber. In the machines now under notice, and illustrated in the accompanyingPlate and woodcut, the position of the saws is constant, excepting a slightlateral motion to produce the taper, and the wood is brought forward inthe requisite direction tangential to the plane of the saw blade. The most irregular curve can always be reduced into a succession ofsmall arcs of circles of different radii, all tangential one to another, andhaving their circles occasionally transferred from one side of the curvedline to the other, every time the direction of the latter is reversed—that is,altered as in the letter S. *. :;;^^l. The accompanying woodcut shows how these successive and yarying cir- cular advances are obtained tangential to the fixed planes of the saw piece of timber after having been sided, that is, having the two straightparallel sides cut, is laid on the machine, consisting chiefly of four rollers,F F G G, the upper edges of which are in the same plane, and pivotingaround axes situated in the longitudinal centre line K K, the saw bladesbeing in S S. The pivoting motion of the whole of these rollers is soconnected by suitable mechanical arrangements (shown in the completeview of the machine, given in our Plate) that their prolonged axes convergeto one point, I, movable on the transverse line X X, perpendicular to thecentre of the saws. The piece of timber borne upon the rollers cannot, therefore, take anyother advance but a revolving motion from this point of convergence,and the facility with which this convergence can be removed to a greateror lesser distan
Size: 1007px × 2483px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
