A shedding mechanism separates the warp threads into two layers or divisions to form a tunnel known as “shed”. The shed provides room for passage of the shuttle. A shed may be formed by means of tappets, cams, etc.
Types of Tappet Shedding Mechanism
Generally there are two types of shedding :
1. Negative shedding
2. Positive shedding
In plain looms, tappets are used to for m sheds.
Generally there are two types of shedding :
1. Negative shedding
2. Positive shedding
In plain looms, tappets are used to for m sheds.
1. Negative shedding: In a tappet shedding mechanism, if the tappet controls only one movement, either an upward or downward movement of the heald shafts, then the shedding is known as “negative tappet shedding”. The heald shafts are returned by some external devices like springs, dead weights, rollers, etc.
2. Positive shedding: In a tappet shedding mechanism, if the tappet controls both upward and downward movements of the heald shafts, then the shedding is known as positive tappet shedding.
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