On supporting science journalism
If you're enjoying this article, consider supporting our award-winning journalism by subscribing. By purchasing a subscription you are helping to ensure the future of impactful stories about the discoveries and ideas shaping our world today.
The annexed engraving, fig. 1, is an isometri cal perspective view of a new mode of running a circular saw without an arbor, invented by T. J. Flanders, of Concord, ?. H., who has taken measures to secure a patent. The principal feature in this plan, is that of the saw being run vertical, and its teeth made to form part of the gearing. Figure 2 is a perspective view of an improvement in running circular saws, by the same inventor, Mr. Flanders, who has taken measures to secure a patent for it also. A, fig. 1, is a stout frame ; ? is the driving pulley, and C is the band passing over pulley, D, [fordrivingthe shaft of wheel, E. This wheel gears into the horizontal ones, F, which are se ? cured on a vertical spindle ; G is a circular I saw without an arbor; it will be seen that I the teeth of wheels, F F, gear into the teeth of the saw, and serve to support as well as rotate the saw ; H H H H are small friction rollers situated in the frame, and made to press against the saw near its upper and under edges, so as to sustain it in its vertical position, and yet produce but a small amount of i friction. These rollers are adjustable and can j be screwed up to the desired pressure. The rest of the parts are in common use, such as j the log carriage, N, moved by rack and pinions, j L K, and made to reverse by the auxiliary belt, I, in thsusual way. This circular saw without an arbor saws out boaids from a log in the same line of cut as a reciprocating saw. The object of running a circuar saw without an arbor is to enable persons to use smaller saws, large ones being very expensive.— The log passes through (as in the common mills.) within the space of the upper and lower friction rollers, H H. A A, fig 2, is a stout frame ; ? is merely a handle on the driving shaft of puIley,C,ov:r which the driving band, D, passes, running over the one side of the pulley on the upper saw (1) spindle or arbor, and then around the pulley, F, on the arbor, G, of the nether saw, H. The two saws, I and H, are constructed and arranged to saw logs, the upper one sawing through one half and the lower one through the other half. There is a peculiarity in the teeth of the saw. They are made one-half thinner than the platp, and thus mike a fine cut, requiring less poser to drive, and at the same time saving some timber ; the teeth are set so as to make the board clear the plafe, and a gouge tooth may be set on the saw, as a clearer. These teeth may be made of fine steel and inserted in the saw plate, which may he cf -A isiJgL iron. As the teeth of the saws wear down by sharpening, an excellent arrangement is presented for keeping them always in the same relative position to one another, by lowering the arbor of the upper saw, and yet having its belt always taut. The bearings, J J, which support the spindle of saw, I, are suspended and supported by screw rods, ? ? ?. These screws therefore lower the bearings of saw, G, just in proportion as the teeth wear down, and thus they are made to cut always in the same line. The belt, D, is always kept tight, owing to the mode of its arrangement, although the pulley, E, may be placed at any height in the frame ; this is evident because it must pass over the same amount of pulley surface and through the same space. The pins in pulley, E, take into the holes in the belt, D, and by this means the spindle of saw, I, is revolved. These descriptions, we suppose, will render the machines and their operations, plain to all, as they are exceedingly simple. For particulars address Flanders & Mansfield, Concord. N. H.
