Understanding Air Jet Loom Weft Propulsion
The propelling force for moving weft yarn on an air jet loom is primarily generated by the air jet's interaction with the yarn. Several factors influence how effectively this force is transferred and applied.
Factors Influencing Propelling Force
The key factors affecting the propelling force include:
- Air velocity: Higher air velocity imparts greater momentum to the air jet, resulting in a stronger push on the weft yarn.
- Coefficient of friction: The friction between the air jet and the yarn surface facilitates the transfer of momentum, influencing the effectiveness of propulsion.
- Yarn diameter: The yarn's diameter affects the surface area exposed to the air jet and the drag experienced, thereby influencing the propelling force.
Irrelevant Factor: Yarn Strength
Yarn strength is the measure of the tension a yarn can withstand before breaking. While crucial for preventing yarn breakages during the weaving process, it does not directly influence the magnitude of the force exerted by the air jet onto the yarn. The air jet provides the force, and yarn strength determines the yarn's resistance to that force, not the force itself.
Conclusion
Therefore, yarn strength is the factor that does not directly influence the propelling force generated by the air jet.
Important Questions from FABR Shuttle Looms and Shuttleless Looms
- Profile reed is used in
- In a projectile weaving machine, the projectile travels through the shed at an average speed of $24$ m/s taking $2/3^{rd}$ of the loom cycle. If the efficiency of the weaving machine is $90\%$, the weft insertion rate (m/min) is (answer in integer) _________
- Match the looms listed in Group I with the corresponding components given in Group II. The correct option is
Group I Group II P. Multiphase 1. Matched cam Q. Projectile 2. Profile reed R. Air-jet 3. Crank shaft S. Shuttle 4. Weaving rotor - In a loom, seven-wheel take-up motion is
A shuttle loom having 1.75 m reed width is running at 180 rpm. The shuttle enters and leaves the shed at $120^\circ$ and $240^\circ$ angular positions of crankshaft, respectively. If length of the shuttle is 0.25 m, then the mean velocity (in m/s) of the shuttle within the shed is________.
