Study on the tappet shedding mechanism of a loom.

Theory:

Tappet is a cam to which rotary motion is given for the purpose of producing reciprocating action by sliding contact of rod and lever. Rod receives a series of lifts for a certain interval of time.

Tappet shedding is of two types:

(a) Negative tappet shedding:
Negative tappet needs extra arrangement of pulley,bowl, spring and dead weight to reverse the direction of healds. This belt pulley either raise or lower the heald.
Example: Shuttle loom.

(b) Positive tappet shedding:
This mechanism provides both upward and downward movement of heald without the help of additional mechanism.
Example: Rapier loom.

Mechanism:

(1) Motor gives motion to the bottom shaft.
(2) Tappets are connected with bottom shaft; tappets provide shedding action.
(3) Tappets depress the threads bowl, ultimately depresses the treadle lever.
(4) Heald frame is connected with treadle lever and upper portion of healds is connected by belt.
(5) Treadle lever ultimately responsible for the downward movement of heald frame and upward movement of healds frame is mechanically generated by belts or ropes.

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Determination of English Count of cotton yarn by wrap reel and electric balance.

Introduction: Count: Count is a numerical value which expresses the coarseness or fineness of yarn in length per unit mass or mass per unit length. Two types of count: (a) Indirect system. (English count, Metric count, Worsted count) (b) Direct system. (Tex, Denier, Pound/Spindle) English count: It is the number of hanks of 840 yards for 1 pound of yarn. Yarn count is denoted by ‘N’. Mathematically, Here, N = Yarn count. L = Sample length. l = Unit length. W = Sample weight. W = Unit weight. Unit length = 840 yds. (For English count) Unit weight = 1 lb = 463.6 gm. (For English count) Objectives: (1) To know about the yarn count. (2) To know about the wrap reel machine. (3) To calculate the yarn fineness. (4) To calculate the yarn smoothness. (5) To know about English count. Machine description: In this experiment we use a wrap reel machine and an electric balance. The wrap reel machine is used measure the length of yarn. In this machine there is bobbin ca...

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Study on Lay out plan of garments manufacturing lab.

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