Figure 1 is a side elevation, and figure 2 is a plan view, of an improved machine for cut ting tin in forms of sections of a circle for va rious articles of tin ware. The same letters refer to like parts. The inventor is H. C. Hart, of New York city. A A represents the bench, and C is a mov able feed table on the bench to leed in the tin plate into the cutters, in the manner desired ; B is a lever with its fulcrum at a, to feed for ward and run back the table C. The bolt, 4, is an axis passing through lever, B, and table, C, working in a longitudinal slot, D, in the bench or bed plate, A, under C ; E is a clamp at the front end of the table for securing the tin plate to feed it to the cutting rollers ; F is a rack bar operated by a pinion, G, for moving forward the plate of tin in the clamp; H H are spring catches secured at one side of the bench, A, tor retaining one end of lever, B; I I are the circular roll cutters or shears. They are secured on spindles, J, and receive a rotary motion by the bevel gearing, M K K'. The cutting shears are secured in an appropriate frame, N. The clamp, E, is raised ; it being attached to hinge, c, at one end, and the plate of tin is then placed under it on the table, C. The back edge of the plate rests against the stop, d, and rack bar, F, the clamp is then pressed upon the tin plate and secured by the catch, !. The front of the plate of tin is thrust suf ficiently far forward as to allow it to go in between cutting rolls, I I, as shown in dotted ines in figure 1. As the table swings on the rolt axis, b, by moving from one side to the ther it describes the arc of a circle, conse quently the tin plate is cut with its edges 'orming part of a circle. Every piece of tin IO cut complete in itself, will form the sec-ion ot a concavo-convex body. The lever, 3, moves the table, C, forward, and the rack ar, F, moves the tin plate forward in the :lamp tobe cut into such segments of a circle is may be required. A series of holes, , is nade in table, C, for the purpose of shifting he axis bolt, b, to alter the sweep of the table, y, on its axis to cut large and small segments f a circle fjom the tin plate. O is a screw bolt on which the back end ot ; rame, N, rests, and by which it can be eleva- i ed or lowered and the cutting rolls, I I, made ( o cut to the incline necessary to operate i well; R is another screw bolt to draw back frame, N, in plate, S. In the plates, P (one on each side) are inclined slots, h, in which sere ws, g-, work to allo w theframe to be slight-| ly elevated or depressed and drawn back, so i that the cutters can be placed in line with respect to the teed table, C ; T is a bed be hind the roll cutters on which the outer edge ofthe plate oftin rests while the plate is be ing cut. The key on the arbor ot the rack i [ wheel, G, is to move the wheel to operate the ! Irackbar, F, and advance the plate of tin.
This article was originally published with the title "Improved Machine for Cutting Tin" in Scientific American 8, 33, 260 (April 1853)