In the classic fuller, of contained dimensions, single pieces are worked. It is made up of:
1. a pair of cylinders (see figure A, point 1) which advance the fabric with strong pressure
adjustable. At the entry of the fabric there are guides and stop devices in case of
entanglements (fig. A, 2);
2. a pair of adjustable vertical cylinders for the shrinkage of the weft fabric and a pair
of jaws (fig. A, 3), which regulate their distance and therefore the weft re-entry;
3. a fulling box or channel (fig. A, 4), placed at the exit of the cylinders.
Its upper part, called “slipper” (fig. A, 5), can exert adjustable pressure on the fabric
which, arriving there, "engulfs" and undergoes a re-entry in the sense of the warp.

Other elements present in the fuller are:
1. an automatic stop device (fig. A, 2), consisting of a metal bar resting on the
fabric of which you feel knots or swellings, in this case bumping against the stop button;
2. the sprayers (fig. A, 6), devices close to the inlet that spray a felting mixture on the fabric;
3. control panel, placed on the front of the machine, regulates the working process.
With automatic machines equipped with detectors of the percentage of return and stop at the result
programmed, the sensor for detecting the return must be sewn at the end of the loop.