Understanding Loom Take-Up Motion
The take-up motion in a loom is responsible for winding the woven fabric onto the cloth roller. It ensures consistent tension and rate of winding.
Seven-Wheel Take-Up Motion Explained
A seven-wheel take-up motion refers to a specific mechanism within the loom. Let's break down its characteristics:
- Positive Motion: This means the mechanism actively drives the fabric winding process. It uses gears or other positive linkages to ensure the fabric is taken up at a controlled rate, rather than relying solely on fabric tension. The 'seven-wheel' aspect often implies a geared system contributing to this positive drive.
- Intermittent Motion: This indicates that the fabric is advanced in distinct steps or intervals, typically after a set number of weft insertions (picks) or a specific movement of the loom's lay. It's not a continuous, smooth advance.
Conclusion on Seven-Wheel Take-Up
Based on its mechanical design, implying geared control, the seven-wheel take-up motion provides a positive drive. Its operation is typically designed to advance the fabric in intervals, making it intermittent.
Therefore, the seven-wheel take-up motion is classified as Positive and intermittent.
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 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________.
The diameter and length of torsion rod used in a projectile loom are increased by 5% and 20%, respectively. If the torque required to twist the rod increases by X%, then the value of X, accurate to two decimal places, is_______.
