Why more than two tappets are impractical to use in bottom shaft of a loom ? DUET-2014

-

  • Why more than two tappets are impractical to use in bottom shaft of a loom ? DUET-2014                  
  •  Ans:Bottom shaft contains two picking tappet i.e one revolution of bottom shaft, two times picking is done, so it is needed to do two times shedding for one revolution of bottom shaft. So,If shedding tappet is placed on bottom shaft.It is impossible to use more than two. If bottom shaft contains 3 tappets produce 3 times beating and 3 times picking which is not real i.e picking mechanism is always mounted on the bottom shaft and picking takes place alternatively from the opposite side for each revolution of bottom shaft.

Comments

Post a Comment

Popular posts from this blog

Determination of yarn twist through electric twist tester (Direct Counting Method).

-
Image
Name of the Experiment: Determination of yarn twist through electric twist tester (Direct Counting Method). Introduction: Twist: Twist is the spiral arrangement of the fibers around the axis of the yarn. The twist binds the fibers together and also contributes to the strength of the yarn. The amount of twist inserted in a yarn defines the appearance and the strength of the yarn. The number of twists is referred to as turns per inch. Types of twist: 1. S - Twist 2. Z – Twist Twist Measurement in Yarn: The most obvious way to measure the number of twists per unit length of yarn is simply to untwist a known length of the yarn and check visually to see whether the twist has been completely removed. Method of twist Measurements: 1. Straightened fiber technique or the direct count method. 2. Twist contraction technique or the untwist and re-twist method. 3. Twist to break technique. 4. Microscopic Objectives: 1. To know how to determine the yarn twist. 2. To know about electric t
Read more

Difference between rotor spinning and ring spinning frame

-
       Difference between rotor spinning and ring spinning frame Rotor Spinning frame Ring Spinning frame 1.Rotor spinning frame is modern spinning system machine 1.Ring spinning frame is conventional spinning system machine 2.The working speed of rotor spinning frame is faster than ring spinning frame. 2.The working speed of ring spinning frame is lower than rotor spinning frame. 3.Usually rotor spinning frame produced lower count yarn. 3.This machine can produce from low count yarn to high count yarn. 4.Basically the raw material of this machine is low quality. Means low grade cotton 4.Relatively this machine used high grade cotton to produce yarn. 5.Only one drafting system is available on this machine so there are no break draft in this machine 5.Darting system is split in two divisions called main draft and break draft. 6.Tw
Read more

Determination of yarn count through Electric Wrap reel & Balance Method.

-
Image
Name of the Experiment: Determination of yarn count through Electric Wrap reel & Balance Method. Introduction: Yarn count: The yarn count is a numerical expression which defines its fineness or coarseness. It also expresses weather the yarn is thick or thin. A definition is given by the textile institute – “Count is a number which indicates the mass per unit length or the length per unit mass of yarn. A definition of yarn count is given by textile institute “Count a number indicating the mass per unit length or the length per unit mass of yarn”. Several systems and unit are used for expressing the yarn number. Depending on the material used for preparing the yarn. 1. Indirect system 2. Direct system 3. Universal system Indirect system: In this system the count is the number of units of length per unit of weight of yarn. In this case higher the count, finer is the yarn. This system is generally used for cotton, woolen, worsted linnet. Let N = the yarn Count or Number
Read more