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 remains at their complete rest position until the weave pattern does not requires to change the position of 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.
You may also interested in following articles:
Let - off motion, secondary loom motion
Take - up motion, a secondary loom motion
Shedding motion, a primary loom motion
Picking motion, a primary loom motion
Beating motion, a primary loom motion
Schematic diagram of loom