. The principles and processes of cotton yarn manufacture. antages, not the least being increased production andeconomy of work, have led to its adoption. It seems therefore advisableto devote the following discussion to the revolving flat card. There are several makes of this kind of card. They resemble eachother closely, differing only in the devices for adjusting various parts 52 COTTON YARN MANUFACTURER common to all makes, and in the manner in which the different parts areconstructed. They all perform the same work pretty satisfactorily, thenearest approach to perfection being claimed by
. The principles and processes of cotton yarn manufacture. antages, not the least being increased production andeconomy of work, have led to its adoption. It seems therefore advisableto devote the following discussion to the revolving flat card. There are several makes of this kind of card. They resemble eachother closely, differing only in the devices for adjusting various parts 52 COTTON YARN MANUFACTURER common to all makes, and in the manner in which the different parts areconstructed. They all perform the same work pretty satisfactorily, thenearest approach to perfection being claimed by many different builders. Reference to Figs. 31 and 32 may be made in connection with thedescription which follows. The lap having end of an iron or wooden lap stick protrudingfrom either end is placed at the back of the machine, and is made to restupon a corrugated wooden roller called a lap roll, B, in Fig. 33. B isgiven a positive motion in the direction of the arrow by means of a trainof gears hereinafter shown. The contact between A and B unrolls the. lap, which is prevented from being carried forward bodily by the contactof the protruding lap rod with the slotted uprights on each side of thecard. One is shown at S in Fig. 32. As the lap is unrolled, the sheet of cotton is led along a smooth platecalled a feed plate. This plate with the contiguous feeding parts isshown in Fig. 33, and in detail in Fig. 34. One end of the plate is dished out, so to speak, taking the curve of aroll called the feed roll which fits into it. Between the roll and the platethe cotton is passed. A firm grip is exerted by the roll owing to twoweights which press upon it. One of these can be seen in Fig. 32. The roll itself is corrugated throughout its length, which equals the CARDING 53 width of the machine. It is positively driven b\ gearing at a speedvarying from three-quarters of a turn to four turns per minute. Referring again to Fig. 34 it will be seen that the feed roll pushesthe end of
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