Shedding Mechanism

Shedding is a process of raising and lowering of warp yarns by harnesses

To make an opening for the filling (weft) yarn to pass through. All weaving machines control the warp yarns to create a shed. This can be

Accomplished with the following systems:

1. Crank shedding

2. Cam shedding or tappet shedding

3. Dobby shedding

4. Jacquard shedding
Crank Shedding:
Crank shedding mechanisms can only be used for plain weave fabric
constructions.
In this system the harnesses are controlled by the crank shaft of the weaving machine. For each crank shaft revolution a wheel is rotated half a turn, which changes the harness position.
Cam Shedding:
A cam is a disk which has grooved or conjugated edges which corresponds to the lifting plan. The lifting plan controls which harnesses are lifted. The disadvantage of cam shedding is that when the woven design has to be changed the cams have to be rearranged to suit the new design. Pattern design is also limited due to the amount of harnesses the cams can control. cams convert the rotary motion of the main shaft of the weaving machine into the reciprocating motion of the Heald frame.
Jacquard Shedding:
In jacquard weaving a device called a ‘jacquard’ selects and lifts the warp yarns individually.
It has types.
Mechanical Jacquard

Electronics Jacquard

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