# Rieter

### Monitoring devices with self-compensation

#### Index

Fig. 14 – Former MECATROL by Zinser

(Outdated but interesting)

This is a simple but interesting compensation technique. It was offered only by the Zinser company as MECATROL (Fig. 14). The so-called „toothed roller leveler“ consists of a toothed roller pair (1) and a fluted/pressure roller pair (2) forming a small drafting device in front of the actual drafting arrangement. As the individual slivers pass through the assembly they press the two toothed rollers (1) apart by an amount corresponding to the sliver volume. A thin sliver permits the upper roller to penetrate more deeply into the inter-tooth spaces of the lower roller. This gives greater diversion of the fiber strand at the point where it passes through, which is equivalent to an increase in the circumference of the roller. If the rate of rotation is held constant, the result is a higher peripheral speed. Since the peripheral speed of the roller pair (2) remains constant, and while the draft is given by:
$V =\frac{v2}{v1}$,
the draft is reduced between the roller pairs. A thin place is thus drawn to a lesser degree than a normal piece of sliver.

If a thick place passes through, the upper toothed roller is lifted. The sliver diversion between the teeth becomes smaller, as do the circumference and the peripheral velocity. The draft is thus increased, which produces at least a partial compensation of the thick place. The measuring and adjusting points are identical and the reaction is thus very fast. A fault in an individual sliver can be reduced to about 40-50%. However, it is not possible to set a desired value.