Definition of Weaving Loom Shed:
The warp threads are divided into two layers or parts one above the other, for the passage of the shuttle with a pick of weft. The space or gap between the two layers of the warp threads is called shed. A shed is produced by means of healds or harnesses.
Types of Shed:
Shed is classified according to the position of the ends:
1. Closed Shed
2. Bottom Shed.
1. Closed Shed is classified on two parts. A) Bottom Closed Shed, B) Centre Closed Shed.
2. Open Shed are classified on two parts. A) Semi-open Shed, b) Open Shed.
Bottom Closed Shed:
This kind of shed is produced by giving motion only to threads that are to form the upper line. Under this condition the warp is level on the bottom line. Hence in order to form a top shed, it is necessary to move some threads through a space equal to twice the depth of a shed, once up and once down, before a fresh selection is made. A shade of this kind is known as a stationary bottom with a rising and falling top.
Centre Closed Loom Shed:
Centre closed shed is produced by imparting an upward movement to those threads which are to form the top line and a downward movement to the threads which are to form the bottom line, then after inserting a pick, both the lines meet at the centre.
