Group I Group II P. Variable heald staggering 1. Not favourable for heavy fabric Q. High eccentricity ratio 2. Reduction in shed height R. Fixed heald staggering 3. Reduction of sley dwell S. Late shedding 4. Higher vibration in weaving machine
Weaving Machine Parameters and Shortcomings Matching Solution
This solution provides a match between specific weaving machine parameters from Group I and their associated shortcomings listed in Group II. The matching is based on common principles in weaving technology.
Parameter-Shortcoming Matching Details
| Group I Parameter | Group II Shortcoming | Match | Reasoning |
|---|---|---|---|
| P. Variable heald staggering | 3. Reduction in shed height | P-3 | Variable staggering can alter warp paths, potentially reducing effective shed height required for weft insertion. |
| Q. High eccentricity ratio | 4. Higher vibration in weaving machine | Q-4 | Eccentricity in rotating components generates unbalanced forces, leading to increased machine vibrations. |
| R. Fixed heald staggering | 2. Reduction of sley dwell | R-2 | Fixed staggering limits the flexibility in shed timing and shape, possibly reducing the dwell time critical for beat-up. |
| S. Late shedding | 1. Not favourable for heavy fabric | S-1 | Late shedding negatively impacts the beat-up process, causing defects and making the weaving of heavy fabrics problematic. |
The correct matching derived is P-3, Q-4, R-2, S-1.
Important Questions from FABR Loom Mechanisms Shedding
- Group I lists the components of the weaving machine and Group II lists their functions. Match the component with its function.
Group I Group II P Conjugate/matched cams 1 Driving the cloth roller with slip
driveQ Worm and worm wheel 2 Continuous positive take up
motionR Friction clutch device 3 Motion of sley in rapier loom S Lease rod 4 Separation of the warp sheet
forming the shed Amongst the following, the correct condition(s) that will reduce bumping during weaving is/are
Group I gives a list of loom motions and Group II contains loom systems. Match the motion from Group I with the corresponding system from Group II.
Group I Group II P. Shedding 1. Matched cam Q. Picking 2. Seven wheel R. Beat-up 3. Rapier S. Take-up 4.Jacquard Determine the correctness or otherwise of the following Assertion [a] and Reason [r]
Assertion: In shuttle loom, late shedding is preferred for filament weaving.
Reason: In late shedding, the timing of shed dwell matches with the timing of shuttle travel through the shed, and therefore, it minimises the rubbing of warp yarns.
For a shuttle loom, producing plain woven fabric, if each of the dwell periods of the shedding cam corresponds to one-third of crank shaft rotation, the sum of the two dwell periods of the cam (in degree) is_____.
