CALICO-PRINTING 



605 



349 



the rollers receive the final and delicate adjustment so as to register accurately 

 with one another. It consists essentially of two parts : the disc A, carrying the cogs ; 

 and the hollow axis B, carrying a disc at 

 one side, and the connecting piece and 

 screw c D at the other. The part A A, or 

 shell of the wheel, is about 10 inches in dia- 

 meter and 3 inches broad across the cogs ; 

 one side of the shell is cut out to receive 

 the plate shown by dotted lines. This 

 plate is provided with the hollow axis u, 

 which comes through the shell, and pro- 

 jects about 3 inches, the part projecting 

 being cut through at F F ; fastened to it 

 also is the connecting piece c, in which 

 works the screw D ; this screw just fits in 

 two projecting lugs G F, cast on the shell A. 

 The screw-nut E forms part of the axle 

 piece, and works in the slide H. When 

 this wheel is used, it is slipped on the 

 mandrel which carries the copper roller, 

 and a cotter is driven through the cleft 

 axle and through a corresponding cotter 

 hole in the mandrel, thus firmly con- 

 necting the mandrel and wheel; the mandrel and roller being put in their place 

 in the machine, the cogs of the mandrel wheel work into the main driving wheels, as 

 shown in fig. 348. The coarse adjustment of the rollers being made when putting 

 them in their places, the fine adjustment is made by turning the screw D. It is 

 obvious that the screw D, by pressing against the lugs o of the shell A, which is 

 geared into the driving wheel, will turn the mandrel and roller without moving the 

 cogs. By this arrangement, any roller may be moved round about 2 inches at any 

 time after being fixed in its place. All machines of more than one colour are fitted 

 with these wheels, which indeed are indispensable. 



Fig. 350 represents a 6-colour printing-machine as made by Mather and Platt. A 

 is the bowl or cylinder ; B, copper printing rollers upon iron mandrels ; c, blocks, &<;., 



or journals for carrying the mandrels and copper rollers, the blocks being adjustable 

 by screws for fitting the pattern ; D, setting up screws and levers for giving the 

 pressure of copper rollers on to the cloth being printed ; E, framing of machine, with 

 nips or horns cast on, in which the blocks work ; F, white cloth to be printed running 

 from batch through the machine, and thence to the drying apparatus ; o, grey or 

 intermediate cloth ; H, blanket or back-cloth; i, friction-wheel for drawing traverso 



