Rieter

The feed device

Index

There is no machine drive of the feed rollers as such; they are driven indirectly by the opening and closing of the nipper plates. Forward shift of the web by the feed roller into the opened nippers can be performed:

  • while the nippers move forward (described above as forward feed); or
  • when the nippers swing back (described as backward feed).

Some types of comber can be operated in only one feed mode (forward feed), others can be operated selectively in either mode. Selection of the required mode then involves an adjustment. On the Rieter comber this can be carried out quickly and easily by replacement of the two drive change gears on opposite sides of the feed roller (Fig. 39). Rotation of the feed rollers to feed the lap sheet forward by 4.3 to 6.7 mm is derived from the relative movements of the upper and lower nippers. For example, in the case of forward feed, when the upper nipper plate is opened it rotates the roller via the ratchet (by one ratchet tooth) by withdrawing the pawl secured to the upper nipper plate. In the case of backward feed, i.e. rotation of the cylinder as the nippers close, a pair of gear wheels and an internally toothed ratchet are needed. The change wheels can be replaced to adjust the type of feed and the feed amount per cycle.

The following feed distances per cycle are used in the Rieter comber:

Type of feed
Number of teeth
on the rathcet
Feed distance
per cycle (mm)

Forward feed and
backward feed

16
5.9
18
5.2
20
4.7
22
4.3

Fig. 38 – Arrangement of the nipper, the feeding and the detaching device

Fig. 39 – Feed roller drive