Practical hand weaving course
Lyon Municipal Weaving SchoolProfessor A.CREPT - Year 1912-1913
The handwritten course has been copied by us.This hand weaving course on looms was used until the 1980s.

The actual threshing is the packing of the weft in the warp yarns to build the fabric. This settling produces by the fall of the comb driven by the leaf against the woven part. This threshing can be done in different ways. Indeed, the leaf can be free in its stroke or stopped at a fixed point, or else the comb can be mounted on a liner (mobile frame). These 3 types of threshing can be applied indistinctly to open, mixed or closed work.
The threshing is said to be free when the comb strikes freely on the weft without the leaf being stopped at any point in its course. Free threshing is used in the execution of most fabrics and generally with the work of mixed pitching.When the wing is stopped at a specified point by wooden stops or stops fixed against the banks of the front legs of the loom. The threshing is said to be fixed or on wood. With this type of threshing, the reduction of the fabric is obtained by the greater or lesser winding speed given to the roll of fabric by the regulator. It is used in fabrics for which it is essential that the reduction be perfectly uniform irrespective of the irregularities of the weft yarns. The fabrics which are woven with this kind of threshing are the united or molded moiré fabrics, the furnishing fabrics, the gauzes, etc.
When the comb is mounted on a mobile frame called a snail, the threshing is said to be movable or elastic or else to a snail.
In the hand looms, this threshing is only used for fabrics that are not very small and very light, the comb by its recoil at the moment of impact against the weft decreases the hardness of the thrust.