# GATE (TF) Textile 2011 Question Paper Solution | GATE/2011/TF/37

###### Question 37 (Textile Engineering & Fibre Science)

For a 5/3 twill weave, if the rotational speeds of the crank shaft, bottom shaft and tappet shaft are X, Y and Z respectively, then X:Y:Z would be

Given in the question-

Type of weave=5/3 twill weave

i.e. Total no. of picks=5+3

Total no. of picks=8

Rotational speed of crank shaft=X

Rotational speed of bottom shaft=Y

Rotational speed of tappet shaft=Z

Then , X:Y:Z=?

As we know,

Rotational speed of bottom shaft is half of the crank shaft

i.e, Y=X/2

and

Rotational speed of tappet shaft is equal to the crank shaft divided by number of picks.

i.e. Z=X/8

Now,

X:Y:Z=8:4:1 (Ans)

### What is tappet shaft?

In the textile industry, a tappet shaft is a key component of a tappet shedding mechanism, which is used in certain types of weaving machines. The tappet shaft is a rotating shaft that is mounted on the loom and operates in synchronization with the weaving cycle.
The tappet shaft has a series of protruding “tappets,” which are designed to interact with the loom’s “picking” mechanism to control the movement of the warp threads. As the tappet shaft rotates, the tappets move up and down, which in turn moves the picking mechanism and controls the shedding motion of the loom.
The number and arrangement of the tappets on the tappet shaft determine the pattern and design of the fabric being woven. By controlling the movement of the warp threads, the tappet shedding mechanism enables the weaver to create a variety of intricate patterns and designs in the fabric.
Overall, the tappet shaft plays a critical role in the operation of a tappet shedding mechanism, which is an important component of certain types of weaving machines used in the textile industry.