. The principles and processes of cotton yarn manufacture. minute. This speed and the relation between the doffers teethand those on the cylinder, allow the swiftly revolving cylinder to depositits cotton on the doffer. There is therefore cotton on the cylinder evenwhile it passes from the point of nearness to the doffer around to the CARDING 59 licker-in. Underneath the cylinder between these two points is placed atin screen or under-casing, similar to the one under the Hcker-in. Thiswas incidentally referred to before; it can be clearly seen at C^ in , and at U in Fig. 33. It has the s
. The principles and processes of cotton yarn manufacture. minute. This speed and the relation between the doffers teethand those on the cylinder, allow the swiftly revolving cylinder to depositits cotton on the doffer. There is therefore cotton on the cylinder evenwhile it passes from the point of nearness to the doffer around to the CARDING 59 licker-in. Underneath the cylinder between these two points is placed atin screen or under-casing, similar to the one under the Hcker-in. Thiswas incidentally referred to before; it can be clearly seen at C^ in , and at U in Fig. 33. It has the same function as the licker-inscreen and its proper adjustment has much influence upon the amountof waste. Owing to its slow speed, the doffer receives the cotton in a sheetthicker than the one on the cylinder, if there be one on the cylinder atall. It is very likely, of course, that there is no continuous sheet on thecylinder, but that there are many bare places. On the doffer, however,there is a thin sheet. This is carried around on the underside of the. Fig. 37- doffer towards the front of the machine. Here it is stripped off by aswiftly oscillating comb called the * doffer comb. This comb is only afew thousandths of an inch distant from the doffer, and makes about1,100 vibrations per minute. It removes the cotton effectually in theform of a very thin web (see Fig. 38). The shape of the doffer combcan be partly seen in this Fig. 38. It is a flat strip with serrations onits lower edge; five short bars support it on a shaft which receives areciprocating motion. The web is next passed through a trumpet shown at G, Fig. 33, andat G, Fig. 38. A detailed view of this trumpet is shown in Fig. the cotton is first started through the card, it has to be trained by 6o COTTON YARN MANUFACTURE hand into a thin strand and pushed through the trumpet hole. There-after the cohesion of the fibres is sufficient to prevent the web frombreaking as it passes from the doffer. After emerging
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