. The principles and processes of cotton yarn manufacture. circular comb the nippersopen and close once. They, of course, have to be timed so as to open andclose at the proper time. ? Top Comb. ; A detached view of the top comb may be seen in Fig. 89. P, holdingthe top comb Q, is fulcrumed at M and may move loosely around to the shaft M is a downward extending arm L carrying a bowlB, which rests on a cam W on the cylinder shaft. In the position shownin the drawing the bowl is resting on the low part of the cam. In thajtcase the weight of the combs is sufficient to make them penetrat
. The principles and processes of cotton yarn manufacture. circular comb the nippersopen and close once. They, of course, have to be timed so as to open andclose at the proper time. ? Top Comb. ; A detached view of the top comb may be seen in Fig. 89. P, holdingthe top comb Q, is fulcrumed at M and may move loosely around to the shaft M is a downward extending arm L carrying a bowlB, which rests on a cam W on the cylinder shaft. In the position shownin the drawing the bowl is resting on the low part of the cam. In thajtcase the weight of the combs is sufficient to make them penetrate thecotton. The shaft M extends the whole length of the machine, and to i,tthe six levers P, carrying the several combs, are fulcrumed. When thehigh part of the cam raises the bowl B the end of the screw S presses 124 COTTON YARN MANUl^ACTURE against the lower end of the lever P and raises the comb. By the screwS the length of time that the comb may remain in the cotton can be regu-lated, and S the distance which it will sink into the cotton. P is set. loosely upon M so that any comb may be raised, when one wishes to getat the inner part of the machine. Rocking Motion of Top Detaching Rolls. It has been previously stated that the steel detaching roll makes abackward movement through about one-third of a revolution just as thenewly-combed piece of cotton is brought forward by the fluted leather detaching roll revolves backward, too, since it is held firmlyin contact with the steel roll by weights. The leather roll also is rockedbackward as the segment approaches in order to establish a firm grip uponthe cotton between itself and the fluted segment. The rocking motion ofthe leather roll will first be described. The movement is controlled by thesecond cam on the cam shaft. The connection between the cam and theroll is shown in Fig. 90. In the cam course C fits a bowl attached to thebell-crank lever Y, which is fulcrumed at F. Y is connected by the con-necting rod r to
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