In this type of dobby, those heald shafts which need to become in rest position at top as per weave pattern come slightly down and lift again. This kind of dobby is known as semi-positive dobby.
In this kind of dobby, the heald shafts remain at their complete rest position until the weave pattern does not require changing the position of the heald shaft.
In his kind of dobby, the selection of raising and lowering is performed mechanically. It can be further classified as follows:
• Right hand mounted dobby.
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Schematic diagram of loom