Rieter

The detaching apparatus

Index

Fig. 116 – Web detaching using detaching rollers and transverse belts

On old cards, a fly-comb (a rapidly oscillating comb) oscillating at up to 2 500 strokes per minute takes the web from the  doffer. In modern high-performance cards, a fly-comb would be unable to perform this task because the stroke rate would have to be significantly higher (above the mechanical limit). A roller (Fig. 116, 1) now has the task of separating the web from the doffer. In old cards, the web is guided into a funnel, while being freely suspended over a distance of 30 - 50 cm and running together in a wedge shape.

This arrangement is also no longer possible at the high speeds of modern high-performance cards, since the web would fall apart.

Now, the web must be condensed into a sliver while still located within the detaching device.

This can be achieved in a number of ways; for example, with web guide plates upstream from the detaching device, with several transversely arranged guide rollers (Marzoli), or with a transverse sliver condenser (3). In the latter, either two counter-rotating belts carry the web into the center or one circulating belt carries the web to one side of the card.