604 



CALICO-PRINTINa 



consequently under the cleaning doctors, where by preventing them from perfectly 

 wiping the blank parts of the roller, smears on the piece would ensue. The colour 

 boxes are mounted on wooden boards, to give them greater strength, and are tight- 

 ened up against the roller by the screws E B and w w ; the lower pair of colour boxes 

 are removed from the copper roller when not in use by the handles v, after detaching 

 the screws ww. There is a toothed wheel slipped on to each mandrel, working into 

 a toothed wheel on the axis of the furnishing roller, which ensures the copper roller 

 and furnishing roller always turning together. By means of an excentric, fixed 

 on the axis of the pressure bowl, and connected with each cleaning doctor, a regular 

 vibratory movement is given to them, which prevents the doctor being worn down 

 unequally. Sometimes for the highest rollers, and especially in machines of more 

 than four colours, the cumbrous colour box is dispensed with, and a doctor inserted 

 in a curved frame is applied to the roller instead. In this arrangement the doctor 

 forms the bottom of the colour reservoir, and is pressed strongly against the roller ; 

 the curved frame stopped off at the sides with a piece of copper curved to fit both 

 roller and frame, and which is padded with a piece of folded cotton cloth, forms the 

 colour box. This doctor box takes but little room, and wastes but little colour, but is 

 only used for the uppermost rollers. Neither of these arrangements can be shown in 

 fig. 345. The roll of pieces is shown at a, wound on the wooden roller b, the axis of 

 which rests in bearings at the end of the arms. The piece is conducted under a 

 small wooden roller, next over a square iron bar, and next 

 347 against the scrimping ban Y, thence over the wooden roller x, 



round which also pass the grey piece d, and the woollen 



blanket e. The scrimping bar is a bar of iron or brass, with 

 curved surface, furrowed by grooves, cut right and left from 

 the centre, as in fig. 347. In passing over this bar, the cloth 

 is stretched equally from the centre, and any folds or creases 



removed. In order that the piece may be constantly stretched, the roller b is provided 

 with a wooden pulley, round which passes a leather strap, one end of which is mada 

 fast to the framework, and to the other is attached a weight ; the friction of the strap 

 against the pulley causes a retarding action of the piece, and consequently keeps it 

 stretched. 



Fig. 348 is an elevation of a 12-colour machine, which is inserted to show the way 

 in which all machines are driven. The large spur-wheel is keyed on the axis of the 



348 



pressure bowl, and works into pinions staked on the mandrels ; there is a peculiarity 

 about these pinions, or box-wheels, as they are called, which may bo observed in fig, 

 348, but is shown on an enlarged scale in fig. 349, which is a box-wheel detached. 

 This wheel may be compared to the fine adjustment of a microscope, as by means of it 



