Study on tappet shedding mechanism.

 

Experiment Name : Study on tappet shedding mechanism.

Introduction: Tappets are generally used for heald shedding. Tappet is a type of cam to which a rotary motion is given for the purpose of producing reciprocating motion in rods and levers by sliding contact. When the rod is to receive a series of lifts, with intervals of rest and thus forms a shed called tappet.

Objective:

1) To learn about shedding mechanism of tappet loom.

2) To learn about different parts related to this mechanism.

Figure:

Related Machine parts:

• Tappets.
• bottom Shaft
• Treadle levers
• Fulcrum
• Heald Shaft
• Heald Eye
• Top Reversing Roller

Construction of the mechanism:

1) Tappet achieve motion from bottom shaft.

2) The bowls are placed on the surface off treadle lever.

3) Both treadle lever are connected to lever.

4) Lamb rods, Heald Shaft, Leather Straps are connected to front side of treadle lever.

Working Principle:

1) Tappets are receive motion from bottom shaft.

2) When tappets rotate the nose of tappet strike on the bowls of treadle lever which move down with every strike.

3) The treadle lever pull the lamb rod when tappet strike on it. Due to the pulling operation the heald shaft also move downward.

4) There is returning spring set up to the top  of the loom frame to send back the heald frame to previous position.