A type of cam to which a rotary motion is given for the purpose of producing reciprocating motion in rods & levers by sliding contact when the rod is received a series of lifts, when intervals of rest & thus form a shed is called tappet.
Scope of tappet shedding:
  1. Maximum number of heald shaft capacity is 14 (practically 10 tappets are available).
  2. Normally it produce square design (e.g. 4 × 4, 6 × 6 etc).
  3. It produces only basic fabric structure.
  4. Small design can be produced.
Types of tappet shedding:
Various kinds of shedding tappets are in use in the industry. They are constructed on two principles-
Positive shedding tappets: Two tappets for one heald shaft. Example:
  1. Wood croft’s section tappet.
  2. The oscillating tappet.
  3. Nuttall’s chin tappet.
  4. Scroll tappet.
Negative shedding tappet: One tappet for one heald shaft. Example:
  1. Ordinary plain & twill weave shedding tappet.
  2. Jamieson’s tappet.
  3. Barrel tappet.
Difference between tappet & ordinary tappet:
Ordinary tappet
1. It gives motion to a shaft to receive a series of lifts, with intervals of rest.
1. It gives a continuous reciprocating motion.
2. It is mainly used to produce a shed.
2. It may used for many purpose.
3. All tappets are cam.
3. All cams are not tappet.

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