The moment at which the shed closes is called the shed crossing point.
The pattern chain controls the harnesses and determines which are to be raised or lowered in order to produce the desired pattern.
Thus the differences depend upon how closely the harnesses can be packed; if there are many harnesses, the differences can be large.
Analysis of reasons for air-jet loom heald frame wearing
A satin fabric may have as few as five harnesses to form the repeat (in which case it is called a 5 -shaft satin), or it may have many more.
This requires an adjustment to the movements of the various heddles unless they can all exist in a plane at a fixed distance from the fell of the cloth.
At the time the two sheets of warp become level, the shed is said to be closed.
Some twill patterns may require as many as fifteen harnesses.
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