Rieter

Withdrawal of the web and formation of a sliver

Index

The resulting web must be collected into a sliver by the trumpet (Fig. 52, T) and deposited on the sliver table (B) by the calender rollers (K). This is carried out continuously. However, since detaching rollers (R) are required to perform a back-and-forth movement, during which the web must be maintained intact, a reserve of material must be formed periodically between detaching rollers (R) and withdrawing rollers (Z). Accordingly, a web plate (V) is provided in this zone. During the forward movement of the detaching rollers, the excess web forms a corrugated sheet on the web plate. During the backward movement the corrugations are straightened out again. The web plate therefore functions as a web reserve zone. Collection of the web is performed at the web plate or in the zone immediately following it. The web can be collected toward the center line (Fig. 53, a), as in older web pans, or to one side (b) as on the web plate in modern combers. With a central collecting action, the slightly thicker piecing lines are formed into curves, which distinctly emphasizes the combing cycles (piecing waves). If the web is collected to one side (Fig. 53, b), the piecing lines form diagonals, resulting in partial compensation of the piecing waves. Collection of the web is performed by the sliver trumpet (Fig. 54, T). The mouthpiece of this trumpet must always be adapted to the sliver count (volume). Calender rollers (K) serve to condense the sliver.

Fig. 52 – Web take-up assembly

Fig. 53 – Removal of the web