11. Rotatory Mangle
OF A ROTATORY MANGLE.
I have insisted, often, on the propriety, mechanically speaking, of doing every thing by rotatory motion; and thus of avoiding oscillation wherever it is possible. The present Mangle is another attempt to employ that principle. In Plate 47, figs. 3 and 4, is an under cylinder, turned as usual by any convenient power. B is a small cylinder not connected with it, nor touching it, being intended merely to receive the weight of the mangle-cylinder D, with the goods rolled on it. C is an upper cylinder as heavy as necessary, or loaden through it's journals or centres, with sufficient weights to make it so. Again, the motions of the two cylinders A and C, take place in such a direction, that any round body placed and pressed between them, would receive from them the same motion; and thus, a roller of goods, there introduced, will be mangled. This process is so performed, because the cylinders have toothed wheels a, b, on their axes, but which do not geer together: These wheels being connected by an intermediate wheel c, which makes them concur in producing the rolling effect above mentioned. But, one thing remains to be observed: the wheels a b, though drawn apparently equal, are not equal. The upper one a, has a tooth or two more than the under--so that the motion to the right hand of the under surface of that cylinder, is not equal to the opposite motion of the cylinder A. And hence, the cloth roller D, progresses from D towards x, between the cylinders A C, and finally falls out at x, after as many turns of the whole, as the wheels A C have been calculated to give; and this, is according to the degree of mangling required.