EMBOSSING 



255 



The blocks have adjustable screws g, g, for the purpose of bringing the cylinders 

 up against the paper bowl with any required degree of pressure ; the cylinder B is 

 supported by its gudgeons 



running in blocks, which blocks 823 



slide in the lower parts of the 

 side frames, and are connected 

 to perpendicular rods , having 

 adjustable screw nuts. 



The lower parts of these 

 rods bear upon weighted levers 

 k, Jc, extending in front of the 

 machine; and by increasing 

 the weights I, I, any degree of 

 upward pressure may be given 

 to the cylinder B. 



The colour boxes or troughs 

 c, c, c, carrying the feeding 

 rollers b, b, b, are fixed on 

 boards which slide in grooves 

 in the side frames, and the 

 rollers are adjusted and 

 brought into contact with 

 the surface of the printing 

 cylinders by screws. 



If a black cloth should be required to be introduced between the cylindrical bed or 

 paper bowl E, and the fabric a, a, a, as the ordinary felt or blanket, it may, for printing 

 and embossing cotton, silk, or paper, be of linen or cotton ; but if woollen goods are 

 to be operated upon, a cap of felt, or some such material, must be bound round the 

 paper bowl, and the felt or blanket must be used for the back cloth, which is to be 

 conducted over the rollers H and I, 



For the purpose of embossing the fabric, either of the rollers A, B, or c, may be 

 employed, observing that the surface of the roller must be cut, so as to leave the 

 pattern or device elevated for embossing velvets, plain cloths, and papers ; but for 

 woollens the device must be excavated, that is, cut in recess. 



The pattern of the embossing cylinder will, by the operation, be partially marked 

 through the fabric on to the surface of the paper bowl E ; to obliterate which marks 

 from the surface of the bowl, as it revolves, the iron cylinder roller G is employed ; 

 but as in the embossing of the same patterns on paper, a counter roller is required to 

 produce the pattern perfectly, the iron roller is in that case dispensed with, the im- 

 pression given to the paper bowl being required to be retained on its surface until the 

 operation is finished. 



In this case the relative circumferences of the embossing cylinder, and of the paper 

 bowl, must be exactly proportioned to each other ; that is, the cimunference of the 

 bowl must be equal, exactly, to a given number of circumferences of the embossing 

 cylinder, very accurately measured in order to preserve a perfect register or coin- 

 cidence, as they continue revolving between the pattern on the surface of the em- 

 bossing cylinder and that indented into the surface of the paper bowl. 



The axle of the paper bowl E, turns in brasses fitted into slots in the side frames, 

 and it may be raised by hand from its bearings, when required, by a lever If, extend- 

 ing in front. This lever is affixed to the end of a horizontal shaft L, L, crossing the 

 machine seen in the figures, at the back of which shaft there are two segment levers 

 p, P, to which bent rods Q, Q, are attached, having hooks at their lower ends, passed 

 under the axle of the bowl. At the reverse end of the shaft L, a ratchet-wheel *, is 

 affixed, and a pall or click mounted on the side of the frame takes into the teeth of 

 the wheel r, and thereby holds up the paper bowl when required. 



When the iron roller o, is to be brought into operation, the vertical screws t, t, 

 mounted in the upper parts of the side frames, are turned, in order to bring down 

 the brasses N, which carry the axle of that roller and slide in slots in the side 

 frames. 



The cylinders A, B, and c, are represented hollow, and may be kept at any desired 

 temperature during the operation of printing, by introducing steam into them ; and 

 under the colour boxes c, c, C, hollow chambers are also made for the same purpose. 

 The degree of temperature required to be given to these must depend upon the nature 

 of the colouring material, and of the goods operated upon. For the purpose of con- 

 ducting steam to these hollow cylinders and colour boxes, pipes, as shown at v, v, v, 

 are attached, which lead from a steam-boiler. But when either of these cylinders is 

 employed for embossing alone, or for embossing and printing at the same time, and 



