Feeding apparatus


Feeding material to the opening rollers of an  opening and/or  cleaning machine occurs in free flight (gentle, but less intensive treatment of the fibers), or in a clamped condition (intensive but less gentle treatment). Free flight requires only a drop chute, suction pipe or vortex transport from rollers; a clamped feed condition calls for special machine components. In this case feed devices can be distinguished according to whether they comprise:

  • two interacting clamping cylinders;
  • a feed roller and a feed table;
  • a feed roller and pedals.

Operating with two clamping cylinders (Fig. 10) gives the best forward motion, but unfortunately also the greatest clamping distance (a) between the cylinders and the beating elements.

In a device with a feed roller and table (Fig. 11) the clamping distance (a) can be very small. This results in intensive opening. However, clamping over the whole width is poor, since the roller presses only on the highest points of the web. Thin places in the web can be dragged out of the web as clumps by the beaters.

Where pedals are used (Fig. 12), the table is divided into many sections, each of which individually presses the web against the roller, e.g. via spring pressure. This provides secure clamping with a small clamping distance (a). As far as the feed system is concerned, influence can be exerted on opening and cleaning only via the type of clamping, mainly via the clamping distance (a) to the opening element.

Fig. 10 – Feed to a beater with two clamping rollers

Fig. 11 – Feed with an upper roller and a bottom table

Fig. 12 – Feed with a roller and pedals