Feed of the lap sheet


Two fluted rollers (Fig. 37, 3), driven at constant speed, unroll the web from lap (2). An eccentric shaft (4) is fitted between the rollers and feed cylinder (5). The web is fed over this shaft, which is rotated intermittently in time with the  nipper cycle. Each shaft rotation represents less than a full revolution, first in a forward direction and then in backward feed. This back-and-forth rotation ensures even tension in the web and hence prevents false drafts, which could otherwise arise as a result of fluttering of the web as the distance between the stationary rollers and the feed rollers increases and decreases with the backward and forward movement of the nippers. The eccentricity of the shaft compensates for these changes in distance.

Fig. 37 – Cross-section through the Rieter E 65 comber