CALICO-PRINTING 



603 



pressure being also elastic. There are four pairs of lovers, each pair bearing upon 

 ono mandrel. It will bo sufficient to describe one side only, both sides being pre- 

 cisely alike. The two highest rollers are pressed against the cylinder by the com- 

 pound levers K', which have attachments to the arms of the framework aty, and to the 

 inside of the main framework at g and M' as fulcrums, and are jointed together at h h, 

 but the bent levers h, cj, i, merely fit into sockets i, of the horizontal levers M'K', 

 which are weighted at the ends K', by moveable weights made to fit expanded parts. 

 The two lowest rollers are pressed against the cylinder by the system of compound 

 levers K", which have attachments to the framework at k and M" as fulcrums ; the 

 screws H" H", working in female screws i" i", as in the other set of levers. For 

 convenience of removing the rollers, colour boxes, &c., these levers are provided with 

 a hinged piece N, in a socket o, on the top of which work the screws 1 1, which, by 

 means of the female screw in the lever Tc K" serve still further to regulate the pres- 

 sure ; the lever K" Tc is shown as when the machine is printing, but when the rollers, 

 &c., are to be removed, the lever is lifted by the handle, and the hinged piece N pulled 

 over, the lever with its burden being then lowered down; the weighting of these levers, 

 which are partly outside the machine, is best seen in figs. 344 and 345 where L are the 

 weights, Q are colour boxes, the sides and bottom of which are made of sheet copper, 

 and the ends of gun-metal ; in each end is a slot which receives the brass journals of 

 the wooden furnishing rollers p, which are wrapped with a few folds of coarse calico, 

 and, by revolving in the colour and against the engraved rollers D, supply it equally 

 all over with the colour; the superfluous colour is next wiped off by the colour doctors 

 T. These doctors are thin blades of steel or brass, which are mounted in doctor- 

 shears, or plates of metal screwed together with bolts ; the shears have journals which 

 rest in bearings moveable backwards and forwards by the screws s ; the doctors are 

 kept in close contact with the engraved roller by levers and weights, for the way of 

 arranging which, see fig. 346, where A, B, c, are the levers attached to the doctor 



346 



shears. On the ends of these levers weights are hung, and by this means the doctors 

 arc pressed forcibly against the roller. 



After printing the pattern on the piece, the roller D is cleaned from threads or dust 

 by the lint doctors u, pressed against the roller by the screws s, fig. 345 ; any loose 

 threads from the piece are prevented by the lint doctors from going into the colour, and 



