Figure C shows the path of the fabric
through the two types of cylinders.
The fabric passes:
through a tensioner (see figure C, point 1), from a conveyor cylinder (fig. C, 2), alternatively on the straight cylinders (fig. C, 3) and on the curved cylinders (fig. C, 4). The curved cylinders (fig. C, 4) can assume:
concave position when the wefts are convex with respect to the selvedges,
convex position when the textures are concave.
The straight cylinders (fig. C, 3) can be moved laterally, forwards or backwards relative to the fabric, exerting forces on the fabric as indicated in figure A.
Another system of straightening the weft is used when a diagonal waste occurs
from selvedge to selvedge and exploits the state of tension that is created in the crooked wefts.
the cloth is anchored at both ends to two disks decorated with needles. The disks (drums) are not
controlled but free to turn in the direction of the fabric's advancement, while their mutual position is offset along an oblique line if the weft is crooked. This creates tension on the weft itself and the composition of the forces causes a realignment of the end that is lagging behind.