Rieter

The nipper movements

Index

The lower nipper plate (Fig. 43, 5) is supported at the front by two pivot levers (6), on the left and right respectively, pivoted on comb axis (7) of the circular combs, and also by two swing arms (2) screwed onto nipper shaft (1) and rotatable at point 8. During rotation of the nipper shaft – through less than a full revolution – in the course of each combing cycle, the whole nipper assembly is moved back and forth about point (8) by swing arm (2).

‚Forth‘ means the nippers are moved closer to the detaching rollers as far as the position of closest approach (the detachment setting), and are then withdrawn again. The upper nipper is movably supported on the lower nipper at point 10, and is also suspended from shaft (12) by means of spring (11). Therefore, as the nipper assembly is moved forward, the upper nipper is raised relative to the lower nipper owing to the different lengths (different leverage) of the lever mechanism, and the nippers are opened. As the nippers are withdrawn, spring (11) presses the upper nipper back against the lower nipper (due to the different length of the levers). It is important that the nippers are not closed suddenly and sharply, but gently pressed together with gradually increasing pressure. This gentle closure of the nippers is effected by an eccentric (12). During continuous rotation of the eccentric, the spring is periodically compressed and then released.

Fig. 43 – Diagram of nipper movements